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Gorochu
2026-05-26 23:36:42 -07:00
parent ba051b2f74
commit 555ec72358
41615 changed files with 13344630 additions and 1 deletions
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22
deps/v8/third_party/abseil-cpp/ABSEIL_ISSUE_TEMPLATE.md vendored Normal file
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Please submit a new Abseil Issue using the template below:
## [Short title of proposed API change(s)]
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
## Background
[Provide the background information that is required in order to evaluate the
proposed API changes. No controversial claims should be made here. If there are
design constraints that need to be considered, they should be presented here
**along with justification for those constraints**. Linking to other docs is
good, but please keep the **pertinent information as self contained** as
possible in this section.]
## Proposed API Change (s)
[Please clearly describe the API change(s) being proposed. If multiple changes,
please keep them clearly distinguished. When possible, **use example code
snippets to illustrate before-after API usages**. List pros-n-cons. Highlight
the main questions that you want to be answered. Given the Abseil project compatibility requirements, describe why the API change is safe.]

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deps/v8/third_party/abseil-cpp/AUTHORS vendored Normal file
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# This is the list of Abseil authors for copyright purposes.
#
# This does not necessarily list everyone who has contributed code, since in
# some cases, their employer may be the copyright holder. To see the full list
# of contributors, see the revision history in source control.
Google Inc.

35
deps/v8/third_party/abseil-cpp/BUILD.bazel vendored Normal file
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# Copyright 2020 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
package(default_visibility = ["//visibility:public"])
licenses(["notice"]) # Apache 2.0
# Expose license for external usage through bazel.
exports_files([
"AUTHORS",
"LICENSE",
])
# For building with clang-cl.
# https://bazel.build/configure/windows#clang
platform(
name = "x64_windows-clang-cl",
constraint_values = [
"@platforms//cpu:x86_64",
"@platforms//os:windows",
"@bazel_tools//tools/cpp:clang-cl",
],
)

400
deps/v8/third_party/abseil-cpp/BUILD.gn vendored Normal file
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# Copyright 2018 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Flags specified here must not impact ABI. Code compiled with and without these
# opts will be linked together, and in some cases headers compiled with and
# without these options will be part of the same program.
import("//build/config/c++/c++.gni")
import("//build/config/nacl/config.gni")
import("//build/config/sanitizers/sanitizers.gni")
import("//build/toolchain/toolchain.gni")
import("//build_overrides/build.gni")
import("//third_party/abseil-cpp/absl.gni")
config("absl_component_build") {
defines = [ "ABSL_CONSUME_DLL" ]
}
assert(!is_nacl || is_nacl_saigo,
"base must not be built in most nacl toolchains")
component("absl") {
public_deps = [ ":absl_component_deps" ]
if (is_component_build) {
public_configs = [ ":absl_component_build" ]
if (is_win && is_clang) {
if (current_cpu == "x64") {
if (is_debug) {
sources = [ "symbols_x64_dbg.def" ]
} else {
if (is_asan) {
sources = [ "symbols_x64_rel_asan.def" ]
} else {
sources = [ "symbols_x64_rel.def" ]
}
}
}
if (current_cpu == "x86") {
if (is_debug) {
sources = [ "symbols_x86_dbg.def" ]
} else {
sources = [ "symbols_x86_rel.def" ]
}
}
if (current_cpu == "arm64") {
if (is_debug) {
sources = [ "symbols_arm64_dbg.def" ]
} else {
sources = [ "symbols_arm64_rel.def" ]
}
}
}
}
}
group("absl_component_deps") {
public_deps = [
"//third_party/abseil-cpp/absl/algorithm",
"//third_party/abseil-cpp/absl/algorithm:container",
"//third_party/abseil-cpp/absl/base",
"//third_party/abseil-cpp/absl/base:config",
"//third_party/abseil-cpp/absl/base:core_headers",
"//third_party/abseil-cpp/absl/base:log_severity",
"//third_party/abseil-cpp/absl/base:no_destructor",
"//third_party/abseil-cpp/absl/base:nullability",
"//third_party/abseil-cpp/absl/base:prefetch",
"//third_party/abseil-cpp/absl/cleanup",
"//third_party/abseil-cpp/absl/container:btree",
"//third_party/abseil-cpp/absl/container:fixed_array",
"//third_party/abseil-cpp/absl/container:flat_hash_map",
"//third_party/abseil-cpp/absl/container:flat_hash_set",
"//third_party/abseil-cpp/absl/container:inlined_vector",
"//third_party/abseil-cpp/absl/container:node_hash_map",
"//third_party/abseil-cpp/absl/container:node_hash_set",
"//third_party/abseil-cpp/absl/debugging:failure_signal_handler",
"//third_party/abseil-cpp/absl/debugging:stacktrace",
"//third_party/abseil-cpp/absl/debugging:symbolize",
"//third_party/abseil-cpp/absl/functional:any_invocable",
"//third_party/abseil-cpp/absl/functional:bind_front",
"//third_party/abseil-cpp/absl/functional:function_ref",
"//third_party/abseil-cpp/absl/functional:overload",
"//third_party/abseil-cpp/absl/hash",
"//third_party/abseil-cpp/absl/log:absl_check",
"//third_party/abseil-cpp/absl/log:absl_log",
"//third_party/abseil-cpp/absl/log:absl_vlog_is_on",
"//third_party/abseil-cpp/absl/log:die_if_null",
"//third_party/abseil-cpp/absl/log:globals",
"//third_party/abseil-cpp/absl/log:initialize",
"//third_party/abseil-cpp/absl/log:log_entry",
"//third_party/abseil-cpp/absl/log:log_sink",
"//third_party/abseil-cpp/absl/log:log_sink_registry",
"//third_party/abseil-cpp/absl/memory",
"//third_party/abseil-cpp/absl/meta:type_traits",
"//third_party/abseil-cpp/absl/numeric:bits",
"//third_party/abseil-cpp/absl/numeric:int128",
"//third_party/abseil-cpp/absl/random",
"//third_party/abseil-cpp/absl/random:bit_gen_ref",
"//third_party/abseil-cpp/absl/random:distributions",
"//third_party/abseil-cpp/absl/status",
"//third_party/abseil-cpp/absl/status:statusor",
"//third_party/abseil-cpp/absl/strings",
"//third_party/abseil-cpp/absl/strings:cord",
"//third_party/abseil-cpp/absl/strings:has_ostream_operator",
"//third_party/abseil-cpp/absl/strings:str_format",
"//third_party/abseil-cpp/absl/strings:string_view",
"//third_party/abseil-cpp/absl/synchronization",
"//third_party/abseil-cpp/absl/time",
"//third_party/abseil-cpp/absl/types:optional",
"//third_party/abseil-cpp/absl/types:span",
"//third_party/abseil-cpp/absl/types:variant",
"//third_party/abseil-cpp/absl/utility",
]
# Dependencies that preferably shouldn't be public in chromium.
public_deps += [
# public in abseil, but deprecated in chromium, yet used.
"//third_party/abseil-cpp/absl/base:dynamic_annotations",
# base/logging.cc uses this non-public absl dependency while there no better
# alternative to inject abort hook. See notes in `base/logging.cc`.
"//third_party/abseil-cpp/absl/base:raw_logging_internal",
# absl internal utilities used by protobuf.
"//third_party/abseil-cpp/absl/container:layout",
]
if (is_component_build) {
public_deps += [ ":absl_full_deps" ]
}
# The following dependencies currently don't build with NaCl.
# TODO(https://crbug.com/1114625): Fix build errors and remove this section.
if (is_nacl) {
public_deps -=
[ "//third_party/abseil-cpp/absl/debugging:failure_signal_handler" ]
}
visibility = [ ":absl" ]
}
# Some third-party libraries use additional parts of absl that are banned in
# Chrome (e.g. flags generates static initializers that are undesirable in
# non-test binaries). These third-party libraries can depend on `absl_full`
# instead of `absl` to use those banned subsets of Abseil as well.
source_set("absl_full") {
public_deps = [ ":absl" ]
# In component builds, `absl` itself depends on `absl_full_deps` directly so
# that all of absl is built as a single shared library. This is to prevent
# globals from being duplicated between both `absl` and `absl_full` (e.g.
# inline variables), and the subtle breakage that could cause.
#
# Deps violations will still be enforced by the non-component build.
if (!is_component_build) {
public_deps += [ ":absl_full_deps" ]
}
if (build_with_chromium) {
visibility = [
# Used by some test executables, but not by anything that is a
# part of Chrome.
"//components/optimization_guide/internal/*",
"//third_party/fuzztest:*",
"//third_party/webrtc/*",
# GoogleTest doesn't actually need absl_full, but this makes gn check
# happier.
"//third_party/googletest:*",
]
}
}
group("absl_full_deps") {
public_deps = [
# Banned because each flag registration generates a static initializer, and
# the flag registration mechanism is problematic in component builds.
"//third_party/abseil-cpp/absl/flags:config",
"//third_party/abseil-cpp/absl/flags:flag",
"//third_party/abseil-cpp/absl/flags:parse",
"//third_party/abseil-cpp/absl/flags:reflection",
"//third_party/abseil-cpp/absl/flags:usage",
# Banned because the LOG and CHECK macros conflict with Chrome's version of
# those macros.
"//third_party/abseil-cpp/absl/log",
"//third_party/abseil-cpp/absl/log:check",
]
visibility = [
":absl_component_deps",
":absl_full",
]
public_configs = [ "//third_party/abseil-cpp/absl/flags:absl_flags_config" ]
}
config("absl_include_config") {
include_dirs = [ "." ]
}
config("absl_define_config") {
defines = [ "ABSL_ALLOCATOR_NOTHROW=1" ]
if (is_win && !use_custom_libcxx) {
defines += [
# See crbug.com/1101367: Acknowledge extended alignment when using
# MSVC's standard library.
"_ENABLE_EXTENDED_ALIGNED_STORAGE",
]
}
}
config("absl_default_cflags_cc") {
cflags_cc = []
if (is_clang) {
cflags_cc += [
# TODO(crbug.com/588506): Explicitly enable conversion warnings.
"-Wbool-conversion",
"-Wconstant-conversion",
"-Wenum-conversion",
"-Wint-conversion",
"-Wliteral-conversion",
"-Wnon-literal-null-conversion",
"-Wnull-conversion",
"-Wobjc-literal-conversion",
"-Wstring-conversion",
]
if (!is_nacl) {
cflags_cc += [ "-Wbitfield-enum-conversion" ]
}
}
}
config("absl_test_cflags_cc") {
cflags_cc = []
if (is_clang || !is_win) {
cflags_cc += [
"-Wno-conversion-null",
"-Wno-missing-declarations",
"-Wno-unused-function",
"-Wno-unused-parameter",
"-Wno-unused-private-field",
]
}
if (is_win) {
cflags_cc += [
"/wd4101", # unreferenced local variable
]
}
}
config("absl_test_config") {
cflags_cc = []
if (is_win && !is_clang) {
cflags_cc += [ "/wd4996" ]
}
if (is_clang) {
cflags_cc += [
"-Wno-deprecated-declarations",
"-Wno-implicit-const-int-float-conversion",
"-Wno-unused-private-field",
"-Wno-unused-function",
]
}
}
if (absl_build_tests) {
import("//testing/test.gni")
if (!is_component_build) {
test("absl_tests") {
testonly = true
deps = [
"absl/algorithm:algorithm_test",
"absl/algorithm:container_test",
"absl/base:attributes_test",
"absl/base:config_test",
"absl/base:iterator_traits_test",
"absl/base:no_destructor_test",
"absl/base:nullability_default_nonnull_test",
"absl/base:nullability_test",
"absl/base:poison_test",
"absl/base:prefetch_test",
"absl/base:tracing_internal_strong_test",
"absl/base:tracing_internal_weak_test",
"absl/cleanup:cleanup_test",
"absl/container:common_policy_traits_test",
"absl/container:fixed_array_test",
"absl/container:flat_hash_map_test",
"absl/container:flat_hash_set_test",
"absl/container:hash_function_defaults_test",
"absl/container:inlined_vector_test",
"absl/container:node_hash_map_test",
"absl/container:node_hash_set_test",
"absl/container:node_slot_policy_test",
"absl/container:raw_hash_set_allocator_test",
"absl/container:sample_element_size_test",
"absl/crc:crc32c_test",
"absl/crc:crc_cord_state_test",
"absl/crc:crc_memcpy_test",
"absl/crc:non_temporal_memcpy_test",
"absl/debugging:bounded_utf8_length_sequence_test",
"absl/debugging:decode_rust_punycode_test",
"absl/debugging:demangle_rust_test",
"absl/debugging:stacktrace_test",
"absl/debugging:utf8_for_code_point_test",
"absl/flags:flag_test",
"absl/functional:any_invocable_test",
"absl/functional:function_ref_test",
"absl/functional:overload_test",
"absl/hash:hash_instantiated_test",
"absl/hash:hash_test",
"absl/hash:low_level_hash_test",
"absl/log:absl_check_test",
"absl/log:absl_log_basic_test",
"absl/log:die_if_null_test",
"absl/log:flags_test",
"absl/log:globals_test",
"absl/log:log_entry_test",
"absl/log:log_format_test",
"absl/log:log_macro_hygiene_test",
"absl/log:log_modifier_methods_test",
"absl/log:log_sink_test",
"absl/log:log_streamer_test",
"absl/log:scoped_mock_log_test",
"absl/log:stripping_test",
"absl/log:vlog_is_on_test",
"absl/log/internal:fnmatch_test",
"absl/log/internal:stderr_log_sink_test",
"absl/log/internal:structured_proto_test",
"absl/memory:memory_test",
"absl/meta:type_traits_test",
"absl/numeric:int128_test",
"absl/profiling:exponential_biased_test",
"absl/profiling:periodic_sampler_test",
"absl/random:distributions_test",
"absl/random:mock_distributions_test",
"absl/random/internal:nonsecure_base_test",
"absl/status:status_matchers_test",
"absl/status:status_test",
"absl/status:statusor_test",
"absl/strings:ascii_test",
"absl/strings:char_formatting_test",
"absl/strings:charset_test",
"absl/strings:cord_buffer_test",
"absl/strings:cord_data_edge_test",
"absl/strings:cord_rep_btree_navigator_test",
"absl/strings:cord_rep_btree_reader_test",
"absl/strings:cord_rep_btree_test",
"absl/strings:cord_rep_crc_test",
"absl/strings:cord_test",
"absl/strings:cordz_functions_test",
"absl/strings:cordz_handle_test",
"absl/strings:cordz_info_statistics_test",
"absl/strings:cordz_info_test",
"absl/strings:cordz_sample_token_test",
"absl/strings:cordz_test",
"absl/strings:cordz_update_scope_test",
"absl/strings:cordz_update_tracker_test",
"absl/strings:damerau_levenshtein_distance_test",
"absl/strings:has_absl_stringify_test",
"absl/strings:has_ostream_operator_test",
"absl/strings:match_test",
"absl/strings:str_cat_test",
"absl/strings:str_format_arg_test",
"absl/strings:str_format_bind_test",
"absl/strings:str_format_checker_test",
"absl/strings:str_format_convert_test",
"absl/strings:str_format_extension_test",
"absl/strings:str_format_output_test",
"absl/strings:str_format_parser_test",
"absl/strings:str_format_test",
"absl/strings:str_replace_test",
"absl/strings:string_view_test",
"absl/synchronization:barrier_test",
"absl/synchronization:graphcycles_test",
"absl/synchronization:kernel_timeout_internal_test",
"absl/synchronization:mutex_test",
"absl/synchronization:per_thread_sem_test",
"absl/synchronization:waiter_test",
"absl/time:time_test",
"absl/types:span_test",
"absl/types:variant_test",
"//third_party/googletest:gtest_main",
]
}
}
test("absl_hardening_tests") {
testonly = true
sources = [ "absl_hardening_test.cc" ]
deps = [
":absl",
"//base/test:run_all_unittests",
"//third_party/googletest:gtest",
]
}
}

898
deps/v8/third_party/abseil-cpp/CMake/AbseilDll.cmake vendored Normal file
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include(CMakeParseArguments)
include(GNUInstallDirs)
set(ABSL_INTERNAL_DLL_FILES
"algorithm/algorithm.h"
"algorithm/container.h"
"base/attributes.h"
"base/call_once.h"
"base/casts.h"
"base/config.h"
"base/const_init.h"
"base/dynamic_annotations.h"
"base/internal/atomic_hook.h"
"base/internal/cycleclock.cc"
"base/internal/cycleclock.h"
"base/internal/cycleclock_config.h"
"base/internal/direct_mmap.h"
"base/internal/endian.h"
"base/internal/errno_saver.h"
"base/internal/fast_type_id.h"
"base/internal/hide_ptr.h"
"base/internal/identity.h"
"base/internal/iterator_traits.h"
"base/internal/low_level_alloc.cc"
"base/internal/low_level_alloc.h"
"base/internal/low_level_scheduling.h"
"base/internal/nullability_impl.h"
"base/internal/per_thread_tls.h"
"base/internal/poison.cc"
"base/internal/poison.h"
"base/prefetch.h"
"base/internal/pretty_function.h"
"base/internal/raw_logging.cc"
"base/internal/raw_logging.h"
"base/internal/scheduling_mode.h"
"base/internal/scoped_set_env.cc"
"base/internal/scoped_set_env.h"
"base/internal/strerror.h"
"base/internal/strerror.cc"
"base/internal/spinlock.cc"
"base/internal/spinlock.h"
"base/internal/spinlock_wait.cc"
"base/internal/spinlock_wait.h"
"base/internal/sysinfo.cc"
"base/internal/sysinfo.h"
"base/internal/thread_identity.cc"
"base/internal/thread_identity.h"
"base/internal/throw_delegate.cc"
"base/internal/throw_delegate.h"
"base/internal/tracing.cc"
"base/internal/tracing.h"
"base/internal/tsan_mutex_interface.h"
"base/internal/unaligned_access.h"
"base/internal/unscaledcycleclock.cc"
"base/internal/unscaledcycleclock.h"
"base/internal/unscaledcycleclock_config.h"
"base/log_severity.cc"
"base/log_severity.h"
"base/macros.h"
"base/no_destructor.h"
"base/nullability.h"
"base/optimization.h"
"base/options.h"
"base/policy_checks.h"
"base/port.h"
"base/thread_annotations.h"
"cleanup/cleanup.h"
"cleanup/internal/cleanup.h"
"container/btree_map.h"
"container/btree_set.h"
"container/hash_container_defaults.h"
"container/fixed_array.h"
"container/flat_hash_map.h"
"container/flat_hash_set.h"
"container/inlined_vector.h"
"container/internal/btree.h"
"container/internal/btree_container.h"
"container/internal/common.h"
"container/internal/common_policy_traits.h"
"container/internal/compressed_tuple.h"
"container/internal/container_memory.h"
"container/internal/hash_function_defaults.h"
"container/internal/hash_policy_traits.h"
"container/internal/hashtable_control_bytes.h"
"container/internal/hashtable_debug.h"
"container/internal/hashtable_debug_hooks.h"
"container/internal/hashtablez_sampler.cc"
"container/internal/hashtablez_sampler.h"
"container/internal/hashtablez_sampler_force_weak_definition.cc"
"container/internal/inlined_vector.h"
"container/internal/layout.h"
"container/internal/node_slot_policy.h"
"container/internal/raw_hash_map.h"
"container/internal/raw_hash_set.cc"
"container/internal/raw_hash_set.h"
"container/internal/tracked.h"
"container/node_hash_map.h"
"container/node_hash_set.h"
"crc/crc32c.cc"
"crc/crc32c.h"
"crc/internal/cpu_detect.cc"
"crc/internal/cpu_detect.h"
"crc/internal/crc32c.h"
"crc/internal/crc32c_inline.h"
"crc/internal/crc32_x86_arm_combined_simd.h"
"crc/internal/crc.cc"
"crc/internal/crc.h"
"crc/internal/crc_cord_state.cc"
"crc/internal/crc_cord_state.h"
"crc/internal/crc_internal.h"
"crc/internal/crc_x86_arm_combined.cc"
"crc/internal/crc_memcpy_fallback.cc"
"crc/internal/crc_memcpy.h"
"crc/internal/crc_memcpy_x86_arm_combined.cc"
"crc/internal/crc_non_temporal_memcpy.cc"
"crc/internal/crc_x86_arm_combined.cc"
"crc/internal/non_temporal_arm_intrinsics.h"
"crc/internal/non_temporal_memcpy.h"
"debugging/failure_signal_handler.cc"
"debugging/failure_signal_handler.h"
"debugging/leak_check.h"
"debugging/stacktrace.cc"
"debugging/stacktrace.h"
"debugging/symbolize.cc"
"debugging/symbolize.h"
"debugging/internal/address_is_readable.cc"
"debugging/internal/address_is_readable.h"
"debugging/internal/addresses.h"
"debugging/internal/bounded_utf8_length_sequence.h"
"debugging/internal/decode_rust_punycode.cc"
"debugging/internal/decode_rust_punycode.h"
"debugging/internal/demangle.cc"
"debugging/internal/demangle.h"
"debugging/internal/demangle_rust.cc"
"debugging/internal/demangle_rust.h"
"debugging/internal/elf_mem_image.cc"
"debugging/internal/elf_mem_image.h"
"debugging/internal/examine_stack.cc"
"debugging/internal/examine_stack.h"
"debugging/internal/stack_consumption.cc"
"debugging/internal/stack_consumption.h"
"debugging/internal/stacktrace_config.h"
"debugging/internal/symbolize.h"
"debugging/internal/utf8_for_code_point.cc"
"debugging/internal/utf8_for_code_point.h"
"debugging/internal/vdso_support.cc"
"debugging/internal/vdso_support.h"
"functional/any_invocable.h"
"functional/internal/front_binder.h"
"functional/bind_front.h"
"functional/function_ref.h"
"functional/internal/any_invocable.h"
"functional/internal/function_ref.h"
"functional/overload.h"
"hash/hash.h"
"hash/internal/city.h"
"hash/internal/city.cc"
"hash/internal/hash.h"
"hash/internal/hash.cc"
"hash/internal/spy_hash_state.h"
"hash/internal/low_level_hash.h"
"hash/internal/low_level_hash.cc"
"log/absl_check.h"
"log/absl_log.h"
"log/absl_vlog_is_on.h"
"log/check.h"
"log/die_if_null.cc"
"log/die_if_null.h"
"log/globals.cc"
"log/globals.h"
"log/internal/append_truncated.h"
"log/internal/check_impl.h"
"log/internal/check_op.cc"
"log/internal/check_op.h"
"log/internal/conditions.cc"
"log/internal/conditions.h"
"log/internal/config.h"
"log/internal/fnmatch.h"
"log/internal/fnmatch.cc"
"log/internal/globals.cc"
"log/internal/globals.h"
"log/internal/log_format.cc"
"log/internal/log_format.h"
"log/internal/log_impl.h"
"log/internal/log_message.cc"
"log/internal/log_message.h"
"log/internal/log_sink_set.cc"
"log/internal/log_sink_set.h"
"log/internal/nullguard.cc"
"log/internal/nullguard.h"
"log/internal/nullstream.h"
"log/internal/proto.h"
"log/internal/proto.cc"
"log/internal/strip.h"
"log/internal/structured.h"
"log/internal/structured_proto.cc"
"log/internal/structured_proto.h"
"log/internal/vlog_config.cc"
"log/internal/vlog_config.h"
"log/internal/voidify.h"
"log/initialize.cc"
"log/initialize.h"
"log/log.h"
"log/log_entry.h"
"log/log_sink.cc"
"log/log_sink.h"
"log/log_sink_registry.h"
"log/log_streamer.h"
"log/structured.h"
"log/vlog_is_on.h"
"memory/memory.h"
"meta/type_traits.h"
"numeric/bits.h"
"numeric/int128.cc"
"numeric/int128.h"
"numeric/internal/bits.h"
"numeric/internal/representation.h"
"profiling/internal/exponential_biased.cc"
"profiling/internal/exponential_biased.h"
"profiling/internal/periodic_sampler.cc"
"profiling/internal/periodic_sampler.h"
"profiling/internal/sample_recorder.h"
"random/bernoulli_distribution.h"
"random/beta_distribution.h"
"random/bit_gen_ref.h"
"random/discrete_distribution.cc"
"random/discrete_distribution.h"
"random/distributions.h"
"random/exponential_distribution.h"
"random/gaussian_distribution.cc"
"random/gaussian_distribution.h"
"random/internal/distribution_caller.h"
"random/internal/fastmath.h"
"random/internal/fast_uniform_bits.h"
"random/internal/generate_real.h"
"random/internal/iostream_state_saver.h"
"random/internal/nonsecure_base.h"
"random/internal/pcg_engine.h"
"random/internal/platform.h"
"random/internal/entropy_pool.cc"
"random/internal/entropy_pool.h"
"random/internal/randen.cc"
"random/internal/randen.h"
"random/internal/randen_detect.cc"
"random/internal/randen_detect.h"
"random/internal/randen_engine.h"
"random/internal/randen_hwaes.cc"
"random/internal/randen_hwaes.h"
"random/internal/randen_round_keys.cc"
"random/internal/randen_slow.cc"
"random/internal/randen_slow.h"
"random/internal/randen_traits.h"
"random/internal/salted_seed_seq.h"
"random/internal/seed_material.cc"
"random/internal/seed_material.h"
"random/internal/sequence_urbg.h"
"random/internal/traits.h"
"random/internal/uniform_helper.h"
"random/internal/wide_multiply.h"
"random/log_uniform_int_distribution.h"
"random/poisson_distribution.h"
"random/random.h"
"random/seed_gen_exception.cc"
"random/seed_gen_exception.h"
"random/seed_sequences.cc"
"random/seed_sequences.h"
"random/uniform_int_distribution.h"
"random/uniform_real_distribution.h"
"random/zipf_distribution.h"
"status/internal/status_internal.h"
"status/internal/status_internal.cc"
"status/internal/statusor_internal.h"
"status/status.h"
"status/status.cc"
"status/statusor.h"
"status/statusor.cc"
"status/status_payload_printer.h"
"status/status_payload_printer.cc"
"strings/ascii.cc"
"strings/ascii.h"
"strings/charconv.cc"
"strings/charconv.h"
"strings/charset.h"
"strings/cord.cc"
"strings/cord.h"
"strings/cord_analysis.cc"
"strings/cord_analysis.h"
"strings/cord_buffer.h"
"strings/escaping.cc"
"strings/escaping.h"
"strings/internal/charconv_bigint.cc"
"strings/internal/charconv_bigint.h"
"strings/internal/charconv_parse.cc"
"strings/internal/charconv_parse.h"
"strings/internal/cord_data_edge.h"
"strings/internal/cord_internal.cc"
"strings/internal/cord_internal.h"
"strings/internal/cord_rep_btree.cc"
"strings/internal/cord_rep_btree.h"
"strings/internal/cord_rep_btree_navigator.cc"
"strings/internal/cord_rep_btree_navigator.h"
"strings/internal/cord_rep_btree_reader.cc"
"strings/internal/cord_rep_btree_reader.h"
"strings/internal/cord_rep_crc.cc"
"strings/internal/cord_rep_crc.h"
"strings/internal/cord_rep_consume.h"
"strings/internal/cord_rep_consume.cc"
"strings/internal/cord_rep_flat.h"
"strings/internal/cordz_functions.cc"
"strings/internal/cordz_functions.h"
"strings/internal/cordz_handle.cc"
"strings/internal/cordz_handle.h"
"strings/internal/cordz_info.cc"
"strings/internal/cordz_info.h"
"strings/internal/cordz_sample_token.cc"
"strings/internal/cordz_sample_token.h"
"strings/internal/cordz_statistics.h"
"strings/internal/cordz_update_scope.h"
"strings/internal/cordz_update_tracker.h"
"strings/internal/damerau_levenshtein_distance.h"
"strings/internal/damerau_levenshtein_distance.cc"
"strings/internal/stl_type_traits.h"
"strings/internal/string_constant.h"
"strings/internal/stringify_sink.h"
"strings/internal/stringify_sink.cc"
"strings/has_absl_stringify.h"
"strings/has_ostream_operator.h"
"strings/match.cc"
"strings/match.h"
"strings/numbers.cc"
"strings/numbers.h"
"strings/str_format.h"
"strings/str_cat.cc"
"strings/str_cat.h"
"strings/str_join.h"
"strings/str_replace.cc"
"strings/str_replace.h"
"strings/str_split.cc"
"strings/str_split.h"
"strings/string_view.cc"
"strings/string_view.h"
"strings/strip.h"
"strings/substitute.cc"
"strings/substitute.h"
"strings/internal/escaping.h"
"strings/internal/escaping.cc"
"strings/internal/memutil.cc"
"strings/internal/memutil.h"
"strings/internal/ostringstream.cc"
"strings/internal/ostringstream.h"
"strings/internal/pow10_helper.cc"
"strings/internal/pow10_helper.h"
"strings/internal/resize_uninitialized.h"
"strings/internal/str_format/arg.cc"
"strings/internal/str_format/arg.h"
"strings/internal/str_format/bind.cc"
"strings/internal/str_format/bind.h"
"strings/internal/str_format/checker.h"
"strings/internal/str_format/constexpr_parser.h"
"strings/internal/str_format/extension.cc"
"strings/internal/str_format/extension.h"
"strings/internal/str_format/float_conversion.cc"
"strings/internal/str_format/float_conversion.h"
"strings/internal/str_format/output.cc"
"strings/internal/str_format/output.h"
"strings/internal/str_format/parser.cc"
"strings/internal/str_format/parser.h"
"strings/internal/str_join_internal.h"
"strings/internal/str_split_internal.h"
"strings/internal/utf8.cc"
"strings/internal/utf8.h"
"synchronization/barrier.cc"
"synchronization/barrier.h"
"synchronization/blocking_counter.cc"
"synchronization/blocking_counter.h"
"synchronization/mutex.cc"
"synchronization/mutex.h"
"synchronization/notification.cc"
"synchronization/notification.h"
"synchronization/internal/create_thread_identity.cc"
"synchronization/internal/create_thread_identity.h"
"synchronization/internal/futex.h"
"synchronization/internal/futex_waiter.h"
"synchronization/internal/futex_waiter.cc"
"synchronization/internal/graphcycles.cc"
"synchronization/internal/graphcycles.h"
"synchronization/internal/kernel_timeout.h"
"synchronization/internal/kernel_timeout.cc"
"synchronization/internal/per_thread_sem.cc"
"synchronization/internal/per_thread_sem.h"
"synchronization/internal/pthread_waiter.h"
"synchronization/internal/pthread_waiter.cc"
"synchronization/internal/sem_waiter.h"
"synchronization/internal/sem_waiter.cc"
"synchronization/internal/stdcpp_waiter.h"
"synchronization/internal/stdcpp_waiter.cc"
"synchronization/internal/thread_pool.h"
"synchronization/internal/waiter.h"
"synchronization/internal/waiter_base.h"
"synchronization/internal/waiter_base.cc"
"synchronization/internal/win32_waiter.h"
"synchronization/internal/win32_waiter.cc"
"time/civil_time.cc"
"time/civil_time.h"
"time/clock.cc"
"time/clock.h"
"time/duration.cc"
"time/format.cc"
"time/time.cc"
"time/time.h"
"time/internal/cctz/include/cctz/civil_time.h"
"time/internal/cctz/include/cctz/civil_time_detail.h"
"time/internal/cctz/include/cctz/time_zone.h"
"time/internal/cctz/include/cctz/zone_info_source.h"
"time/internal/cctz/src/civil_time_detail.cc"
"time/internal/cctz/src/time_zone_fixed.cc"
"time/internal/cctz/src/time_zone_fixed.h"
"time/internal/cctz/src/time_zone_format.cc"
"time/internal/cctz/src/time_zone_if.cc"
"time/internal/cctz/src/time_zone_if.h"
"time/internal/cctz/src/time_zone_impl.cc"
"time/internal/cctz/src/time_zone_impl.h"
"time/internal/cctz/src/time_zone_info.cc"
"time/internal/cctz/src/time_zone_info.h"
"time/internal/cctz/src/time_zone_libc.cc"
"time/internal/cctz/src/time_zone_libc.h"
"time/internal/cctz/src/time_zone_lookup.cc"
"time/internal/cctz/src/time_zone_posix.cc"
"time/internal/cctz/src/time_zone_posix.h"
"time/internal/cctz/src/tzfile.h"
"time/internal/cctz/src/zone_info_source.cc"
"types/any.h"
"types/compare.h"
"types/optional.h"
"types/span.h"
"types/internal/span.h"
"types/variant.h"
"utility/utility.h"
"debugging/leak_check.cc"
)
if(NOT MSVC)
list(APPEND ABSL_INTERNAL_DLL_FILES
"flags/commandlineflag.cc"
"flags/commandlineflag.h"
"flags/config.h"
"flags/declare.h"
"flags/flag.h"
"flags/internal/commandlineflag.cc"
"flags/internal/commandlineflag.h"
"flags/internal/flag.cc"
"flags/internal/flag.h"
"flags/internal/parse.h"
"flags/internal/path_util.h"
"flags/internal/private_handle_accessor.cc"
"flags/internal/private_handle_accessor.h"
"flags/internal/program_name.cc"
"flags/internal/program_name.h"
"flags/internal/registry.h"
"flags/internal/sequence_lock.h"
"flags/internal/usage.cc"
"flags/internal/usage.h"
"flags/marshalling.cc"
"flags/marshalling.h"
"flags/parse.cc"
"flags/parse.h"
"flags/reflection.cc"
"flags/reflection.h"
"flags/usage.cc"
"flags/usage.h"
"flags/usage_config.cc"
"flags/usage_config.h"
"log/flags.cc"
"log/flags.h"
"log/internal/flags.h"
)
endif()
set(ABSL_INTERNAL_DLL_TARGETS
"absl_check"
"absl_log"
"absl_vlog_is_on"
"algorithm"
"algorithm_container"
"any"
"any_invocable"
"atomic_hook"
"base"
"base_internal"
"bind_front"
"bits"
"btree"
"check"
"city"
"civil_time"
"compare"
"compressed_tuple"
"config"
"container"
"container_common"
"container_memory"
"cord"
"cord_internal"
"cordz_functions"
"cordz_handle"
"cordz_info"
"cordz_sample_token"
"core_headers"
"counting_allocator"
"crc_cord_state"
"crc_cpu_detect"
"crc_internal"
"crc32c"
"debugging"
"debugging_internal"
"demangle_internal"
"die_if_null"
"dynamic_annotations"
"endian"
"examine_stack"
"exponential_biased"
"failure_signal_handler"
"fixed_array"
"flat_hash_map"
"flat_hash_set"
"function_ref"
"graphcycles_internal"
"hash"
"hash_function_defaults"
"hash_policy_traits"
"hashtable_debug"
"hashtable_debug_hooks"
"hashtablez_sampler"
"inlined_vector"
"inlined_vector_internal"
"int128"
"kernel_timeout_internal"
"layout"
"leak_check"
"log_internal_check_impl"
"log_internal_check_op"
"log_internal_conditions"
"log_internal_config"
"log_internal_fnmatch"
"log_internal_format"
"log_internal_globals"
"log_internal_log_impl"
"log_internal_proto"
"log_internal_message"
"log_internal_log_sink_set"
"log_internal_nullguard"
"log_internal_nullstream"
"log_internal_strip"
"log_internal_voidify"
"log_internal_append_truncated"
"log_globals"
"log_initialize"
"log"
"log_entry"
"log_sink"
"log_sink_registry"
"log_streamer"
"log_internal_structured"
"log_severity"
"log_structured"
"low_level_hash"
"malloc_internal"
"memory"
"meta"
"node_hash_map"
"node_hash_set"
"node_slot_policy"
"non_temporal_arm_intrinsics"
"non_temporal_memcpy"
"numeric"
"optional"
"periodic_sampler"
"pow10_helper"
"pretty_function"
"random_bit_gen_ref"
"random_distributions"
"random_internal_distribution_caller"
"random_internal_distributions"
"random_internal_explicit_seed_seq"
"random_internal_fastmath"
"random_internal_fast_uniform_bits"
"random_internal_generate_real"
"random_internal_iostream_state_saver"
"random_internal_nonsecure_base"
"random_internal_pcg_engine"
"random_internal_platform"
"random_internal_pool_urbg"
"random_internal_randen"
"random_internal_randen_engine"
"random_internal_randen_hwaes"
"random_internal_randen_hwaes_impl"
"random_internal_randen_slow"
"random_internal_salted_seed_seq"
"random_internal_seed_material"
"random_internal_sequence_urbg"
"random_internal_traits"
"random_internal_uniform_helper"
"random_internal_wide_multiply"
"random_random"
"random_seed_gen_exception"
"random_seed_sequences"
"raw_hash_map"
"raw_hash_set"
"raw_logging_internal"
"sample_recorder"
"scoped_set_env"
"span"
"spinlock_wait"
"spy_hash_state"
"stack_consumption"
"stacktrace"
"status"
"statusor"
"str_format"
"str_format_internal"
"strerror"
"strings"
"strings_internal"
"string_view"
"symbolize"
"synchronization"
"thread_pool"
"throw_delegate"
"time"
"time_zone"
"tracked"
"type_traits"
"utility"
"variant"
"vlog_config_internal"
"vlog_is_on"
)
if(NOT MSVC)
list(APPEND ABSL_INTERNAL_DLL_TARGETS
"flags"
"flags_commandlineflag"
"flags_commandlineflag_internal"
"flags_config"
"flags_internal"
"flags_marshalling"
"flags_parse"
"flags_path_util"
"flags_private_handle_accessor"
"flags_program_name"
"flags_reflection"
"flags_usage"
"flags_usage_internal"
"log_internal_flags"
"log_flags"
)
endif()
set(ABSL_INTERNAL_TEST_DLL_FILES
"hash/hash_testing.h"
"log/scoped_mock_log.cc"
"log/scoped_mock_log.h"
"random/internal/chi_square.cc"
"random/internal/chi_square.h"
"random/internal/distribution_test_util.cc"
"random/internal/distribution_test_util.h"
"random/internal/mock_helpers.h"
"random/internal/mock_overload_set.h"
"random/mocking_bit_gen.h"
"random/mock_distributions.h"
"status/status_matchers.h"
"status/internal/status_matchers.cc"
"status/internal/status_matchers.h"
"strings/cordz_test_helpers.h"
"strings/cord_test_helpers.h"
)
set(ABSL_INTERNAL_TEST_DLL_TARGETS
"cord_test_helpers"
"cordz_test_helpers"
"hash_testing"
"random_mocking_bit_gen"
"random_internal_distribution_test_util"
"random_internal_mock_overload_set"
"scoped_mock_log"
"status_matchers"
)
include(CheckCXXSourceCompiles)
check_cxx_source_compiles(
[==[
#ifdef _MSC_VER
# if _MSVC_LANG < 201703L
# error "The compiler defaults or is configured for C++ < 17"
# endif
#elif __cplusplus < 201703L
# error "The compiler defaults or is configured for C++ < 17"
#endif
int main() { return 0; }
]==]
ABSL_INTERNAL_AT_LEAST_CXX17)
check_cxx_source_compiles(
[==[
#ifdef _MSC_VER
# if _MSVC_LANG < 202002L
# error "The compiler defaults or is configured for C++ < 20"
# endif
#elif __cplusplus < 202002L
# error "The compiler defaults or is configured for C++ < 20"
#endif
int main() { return 0; }
]==]
ABSL_INTERNAL_AT_LEAST_CXX20)
if(ABSL_INTERNAL_AT_LEAST_CXX20)
set(ABSL_INTERNAL_CXX_STD_FEATURE cxx_std_20)
else()
set(ABSL_INTERNAL_CXX_STD_FEATURE cxx_std_17)
endif()
function(absl_internal_dll_contains)
cmake_parse_arguments(ABSL_INTERNAL_DLL
""
"OUTPUT;TARGET"
""
${ARGN}
)
STRING(REGEX REPLACE "^absl::" "" _target ${ABSL_INTERNAL_DLL_TARGET})
if (_target IN_LIST ABSL_INTERNAL_DLL_TARGETS)
set(${ABSL_INTERNAL_DLL_OUTPUT} 1 PARENT_SCOPE)
else()
set(${ABSL_INTERNAL_DLL_OUTPUT} 0 PARENT_SCOPE)
endif()
endfunction()
function(absl_internal_test_dll_contains)
cmake_parse_arguments(ABSL_INTERNAL_TEST_DLL
""
"OUTPUT;TARGET"
""
${ARGN}
)
STRING(REGEX REPLACE "^absl::" "" _target ${ABSL_INTERNAL_TEST_DLL_TARGET})
if (_target IN_LIST ABSL_INTERNAL_TEST_DLL_TARGETS)
set(${ABSL_INTERNAL_TEST_DLL_OUTPUT} 1 PARENT_SCOPE)
else()
set(${ABSL_INTERNAL_TEST_DLL_OUTPUT} 0 PARENT_SCOPE)
endif()
endfunction()
function(absl_internal_dll_targets)
cmake_parse_arguments(ABSL_INTERNAL_DLL
""
"OUTPUT"
"DEPS"
${ARGN}
)
set(_deps "")
foreach(dep IN LISTS ABSL_INTERNAL_DLL_DEPS)
absl_internal_dll_contains(TARGET ${dep} OUTPUT _dll_contains)
absl_internal_test_dll_contains(TARGET ${dep} OUTPUT _test_dll_contains)
if (_dll_contains)
list(APPEND _deps abseil_dll)
elseif (_test_dll_contains)
list(APPEND _deps abseil_test_dll)
else()
list(APPEND _deps ${dep})
endif()
endforeach()
# Because we may have added the DLL multiple times
list(REMOVE_DUPLICATES _deps)
set(${ABSL_INTERNAL_DLL_OUTPUT} "${_deps}" PARENT_SCOPE)
endfunction()
function(absl_make_dll)
cmake_parse_arguments(ABSL_INTERNAL_MAKE_DLL
""
"TEST"
""
${ARGN}
)
if (ABSL_INTERNAL_MAKE_DLL_TEST)
set(_dll "abseil_test_dll")
set(_dll_files ${ABSL_INTERNAL_TEST_DLL_FILES})
set(_dll_libs "abseil_dll" "GTest::gtest" "GTest::gmock")
set(_dll_compile_definitions "GTEST_LINKED_AS_SHARED_LIBRARY=1")
set(_dll_includes ${absl_gtest_src_dir}/googletest/include ${absl_gtest_src_dir}/googlemock/include)
set(_dll_consume "ABSL_CONSUME_TEST_DLL")
set(_dll_build "ABSL_BUILD_TEST_DLL")
else()
set(_dll "abseil_dll")
set(_dll_files ${ABSL_INTERNAL_DLL_FILES})
set(_dll_libs
Threads::Threads
# TODO(#1495): Use $<LINK_LIBRARY:FRAMEWORK,CoreFoundation> once our
# minimum CMake version >= 3.24
$<$<PLATFORM_ID:Darwin>:-Wl,-framework,CoreFoundation>
)
set(_dll_compile_definitions "")
set(_dll_includes "")
set(_dll_consume "ABSL_CONSUME_DLL")
set(_dll_build "ABSL_BUILD_DLL")
endif()
add_library(
${_dll}
SHARED
${_dll_files}
)
target_link_libraries(
${_dll}
PRIVATE
${_dll_libs}
${ABSL_DEFAULT_LINKOPTS}
$<$<BOOL:${ANDROID}>:-llog>
)
set_target_properties(${_dll} PROPERTIES
LINKER_LANGUAGE "CXX"
SOVERSION ${ABSL_SOVERSION}
)
target_include_directories(
${_dll}
PUBLIC
"$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
PRIVATE
${_dll_includes}
)
target_compile_options(
${_dll}
PRIVATE
${ABSL_DEFAULT_COPTS}
)
foreach(cflag ${ABSL_CC_LIB_COPTS})
if(${cflag} MATCHES "^(-Wno|/wd)")
# These flags are needed to suppress warnings that might fire in our headers.
set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
elseif(${cflag} MATCHES "^(-W|/w[1234eo])")
# Don't impose our warnings on others.
else()
set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
endif()
endforeach()
string(REPLACE ";" " " PC_LINKOPTS "${ABSL_CC_LIB_LINKOPTS}")
FILE(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/lib/pkgconfig/${_dll}.pc" CONTENT "\
prefix=${CMAKE_INSTALL_PREFIX}\n\
exec_prefix=\${prefix}\n\
libdir=${CMAKE_INSTALL_FULL_LIBDIR}\n\
includedir=${CMAKE_INSTALL_FULL_INCLUDEDIR}\n\
\n\
Name: ${_dll}\n\
Description: Abseil DLL library\n\
URL: https://abseil.io/\n\
Version: ${absl_VERSION}\n\
Libs: -L\${libdir} $<$<NOT:$<BOOL:${ABSL_CC_LIB_IS_INTERFACE}>>:-l${_dll}> ${PC_LINKOPTS}\n\
Cflags: -I\${includedir}${PC_CFLAGS}\n")
INSTALL(FILES "${CMAKE_BINARY_DIR}/lib/pkgconfig/${_dll}.pc"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
target_compile_definitions(
${_dll}
PUBLIC
${_dll_compile_definitions}
PRIVATE
${_dll_build}
NOMINMAX
INTERFACE
${ABSL_CC_LIB_DEFINES}
${_dll_consume}
)
if(ABSL_PROPAGATE_CXX_STD)
# Abseil libraries require C++17 as the current minimum standard. When
# compiled with a higher minimum (either because it is the compiler's
# default or explicitly requested), then Abseil requires that standard.
target_compile_features(${_dll} PUBLIC ${ABSL_INTERNAL_CXX_STD_FEATURE})
endif()
install(TARGETS ${_dll} EXPORT ${PROJECT_NAME}Targets
RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
)
add_library(absl::${_dll} ALIAS ${_dll})
endfunction()

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@ -0,0 +1,460 @@
#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
include(CMakeParseArguments)
include(AbseilConfigureCopts)
include(AbseilDll)
# The IDE folder for Abseil that will be used if Abseil is included in a CMake
# project that sets
# set_property(GLOBAL PROPERTY USE_FOLDERS ON)
# For example, Visual Studio supports folders.
if(NOT DEFINED ABSL_IDE_FOLDER)
set(ABSL_IDE_FOLDER Abseil)
endif()
if(ABSL_USE_SYSTEM_INCLUDES)
set(ABSL_INTERNAL_INCLUDE_WARNING_GUARD SYSTEM)
else()
set(ABSL_INTERNAL_INCLUDE_WARNING_GUARD "")
endif()
# absl_cc_library()
#
# CMake function to imitate Bazel's cc_library rule.
#
# Parameters:
# NAME: name of target (see Note)
# HDRS: List of public header files for the library
# SRCS: List of source files for the library
# DEPS: List of other libraries to be linked in to the binary targets
# COPTS: List of private compile options
# DEFINES: List of public defines
# LINKOPTS: List of link options
# PUBLIC: Add this so that this library will be exported under absl::
# Also in IDE, target will appear in Abseil folder while non PUBLIC will be in Abseil/internal.
# TESTONLY: When added, this target will only be built if both
# BUILD_TESTING=ON and ABSL_BUILD_TESTING=ON.
#
# Note:
# By default, absl_cc_library will always create a library named absl_${NAME},
# and alias target absl::${NAME}. The absl:: form should always be used.
# This is to reduce namespace pollution.
#
# absl_cc_library(
# NAME
# awesome
# HDRS
# "a.h"
# SRCS
# "a.cc"
# )
# absl_cc_library(
# NAME
# fantastic_lib
# SRCS
# "b.cc"
# DEPS
# absl::awesome # not "awesome" !
# PUBLIC
# )
#
# absl_cc_library(
# NAME
# main_lib
# ...
# DEPS
# absl::fantastic_lib
# )
#
# TODO(b/320467376): Implement "ALWAYSLINK".
function(absl_cc_library)
cmake_parse_arguments(ABSL_CC_LIB
"DISABLE_INSTALL;PUBLIC;TESTONLY"
"NAME"
"HDRS;SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
${ARGN}
)
if(ABSL_CC_LIB_TESTONLY AND
NOT ((BUILD_TESTING AND ABSL_BUILD_TESTING) OR
(ABSL_BUILD_TEST_HELPERS AND ABSL_CC_LIB_PUBLIC)))
return()
endif()
if(ABSL_ENABLE_INSTALL)
set(_NAME "${ABSL_CC_LIB_NAME}")
else()
set(_NAME "absl_${ABSL_CC_LIB_NAME}")
endif()
# Check if this is a header-only library
# Note that as of February 2019, many popular OS's (for example, Ubuntu
# 16.04 LTS) only come with cmake 3.5 by default. For this reason, we can't
# use list(FILTER...)
set(ABSL_CC_SRCS "${ABSL_CC_LIB_SRCS}")
foreach(src_file IN LISTS ABSL_CC_SRCS)
if(${src_file} MATCHES ".*\\.(h|inc)")
list(REMOVE_ITEM ABSL_CC_SRCS "${src_file}")
endif()
endforeach()
if(ABSL_CC_SRCS STREQUAL "")
set(ABSL_CC_LIB_IS_INTERFACE 1)
else()
set(ABSL_CC_LIB_IS_INTERFACE 0)
endif()
# Determine this build target's relationship to the DLL. It's one of four things:
# 1. "dll" -- This target is part of the DLL
# 2. "dll_dep" -- This target is not part of the DLL, but depends on the DLL.
# Note that we assume any target not in the DLL depends on the
# DLL. This is not a technical necessity but a convenience
# which happens to be true, because nearly every target is
# part of the DLL.
# 3. "shared" -- This is a shared library, perhaps on a non-windows platform
# where DLL doesn't make sense.
# 4. "static" -- This target does not depend on the DLL and should be built
# statically.
if (${ABSL_BUILD_DLL})
if(ABSL_ENABLE_INSTALL)
absl_internal_dll_contains(TARGET ${_NAME} OUTPUT _in_dll)
absl_internal_test_dll_contains(TARGET ${_NAME} OUTPUT _in_test_dll)
else()
absl_internal_dll_contains(TARGET ${ABSL_CC_LIB_NAME} OUTPUT _in_dll)
absl_internal_test_dll_contains(TARGET ${ABSL_CC_LIB_NAME} OUTPUT _in_test_dll)
endif()
if (${_in_dll} OR ${_in_test_dll})
# This target should be replaced by the DLL
set(_build_type "dll")
set(ABSL_CC_LIB_IS_INTERFACE 1)
else()
# Building a DLL, but this target is not part of the DLL
set(_build_type "dll_dep")
endif()
elseif(BUILD_SHARED_LIBS)
set(_build_type "shared")
else()
set(_build_type "static")
endif()
# Generate a pkg-config file for every library:
if(ABSL_ENABLE_INSTALL)
if(absl_VERSION)
set(PC_VERSION "${absl_VERSION}")
else()
set(PC_VERSION "head")
endif()
if(NOT _build_type STREQUAL "dll")
set(LNK_LIB "${LNK_LIB} -labsl_${_NAME}")
endif()
foreach(dep ${ABSL_CC_LIB_DEPS})
if(${dep} MATCHES "^absl::(.*)")
# for DLL builds many libs are not created, but add
# the pkgconfigs nevertheless, pointing to the dll.
if(_build_type STREQUAL "dll")
# hide this MATCHES in an if-clause so it doesn't overwrite
# the CMAKE_MATCH_1 from (${dep} MATCHES "^absl::(.*)")
if(NOT PC_DEPS MATCHES "abseil_dll")
# Join deps with commas.
if(PC_DEPS)
set(PC_DEPS "${PC_DEPS},")
endif()
# don't duplicate dll-dep if it exists already
set(PC_DEPS "${PC_DEPS} abseil_dll = ${PC_VERSION}")
set(LNK_LIB "${LNK_LIB} -labseil_dll")
endif()
else()
# Join deps with commas.
if(PC_DEPS)
set(PC_DEPS "${PC_DEPS},")
endif()
set(PC_DEPS "${PC_DEPS} absl_${CMAKE_MATCH_1} = ${PC_VERSION}")
endif()
endif()
endforeach()
foreach(cflag ${ABSL_CC_LIB_COPTS})
# Strip out the CMake-specific `SHELL:` prefix, which is used to construct
# a group of space-separated options.
# https://cmake.org/cmake/help/v3.30/command/target_compile_options.html#option-de-duplication
string(REGEX REPLACE "^SHELL:" "" cflag "${cflag}")
if(${cflag} MATCHES "^-Xarch_")
# An -Xarch_ flag implies that its successor only applies to the
# specified platform. Such option groups are each specified in a single
# `SHELL:`-prefixed string in the COPTS list, which we simply ignore.
elseif(${cflag} MATCHES "^(-Wno-|/wd)")
# These flags are needed to suppress warnings that might fire in our headers.
set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
elseif(${cflag} MATCHES "^(-W|/w[1234eo])")
# Don't impose our warnings on others.
elseif(${cflag} MATCHES "^-m")
# Don't impose CPU instruction requirements on others, as
# the code performs feature detection on runtime.
else()
set(PC_CFLAGS "${PC_CFLAGS} ${cflag}")
endif()
endforeach()
string(REPLACE ";" " " PC_LINKOPTS "${ABSL_CC_LIB_LINKOPTS}")
FILE(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc" CONTENT "\
prefix=${CMAKE_INSTALL_PREFIX}\n\
exec_prefix=\${prefix}\n\
libdir=${CMAKE_INSTALL_FULL_LIBDIR}\n\
includedir=${CMAKE_INSTALL_FULL_INCLUDEDIR}\n\
\n\
Name: absl_${_NAME}\n\
Description: Abseil ${_NAME} library\n\
URL: https://abseil.io/\n\
Version: ${PC_VERSION}\n\
Requires:${PC_DEPS}\n\
Libs: -L\${libdir} $<$<NOT:$<BOOL:${ABSL_CC_LIB_IS_INTERFACE}>>:${LNK_LIB}> ${PC_LINKOPTS}\n\
Cflags: -I\${includedir}${PC_CFLAGS}\n")
INSTALL(FILES "${CMAKE_BINARY_DIR}/lib/pkgconfig/absl_${_NAME}.pc"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
endif()
if(NOT ABSL_CC_LIB_IS_INTERFACE)
if(_build_type STREQUAL "dll_dep")
# This target depends on the DLL. When adding dependencies to this target,
# any depended-on-target which is contained inside the DLL is replaced
# with a dependency on the DLL.
add_library(${_NAME} STATIC "")
target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
absl_internal_dll_targets(
DEPS ${ABSL_CC_LIB_DEPS}
OUTPUT _dll_deps
)
target_link_libraries(${_NAME}
PUBLIC ${_dll_deps}
PRIVATE
${ABSL_CC_LIB_LINKOPTS}
${ABSL_DEFAULT_LINKOPTS}
)
if (ABSL_CC_LIB_TESTONLY)
set(_gtest_link_define "GTEST_LINKED_AS_SHARED_LIBRARY=1")
else()
set(_gtest_link_define)
endif()
target_compile_definitions(${_NAME}
PUBLIC
ABSL_CONSUME_DLL
"${_gtest_link_define}"
)
elseif(_build_type STREQUAL "static" OR _build_type STREQUAL "shared")
add_library(${_NAME} "")
target_sources(${_NAME} PRIVATE ${ABSL_CC_LIB_SRCS} ${ABSL_CC_LIB_HDRS})
if(APPLE)
set_target_properties(${_NAME} PROPERTIES
INSTALL_RPATH "@loader_path")
elseif(UNIX)
set_target_properties(${_NAME} PROPERTIES
INSTALL_RPATH "$ORIGIN")
endif()
target_link_libraries(${_NAME}
PUBLIC ${ABSL_CC_LIB_DEPS}
PRIVATE
${ABSL_CC_LIB_LINKOPTS}
${ABSL_DEFAULT_LINKOPTS}
)
else()
message(FATAL_ERROR "Invalid build type: ${_build_type}")
endif()
# Linker language can be inferred from sources, but in the case of DLLs we
# don't have any .cc files so it would be ambiguous. We could set it
# explicitly only in the case of DLLs but, because "CXX" is always the
# correct linker language for static or for shared libraries, we set it
# unconditionally.
set_property(TARGET ${_NAME} PROPERTY LINKER_LANGUAGE "CXX")
target_include_directories(${_NAME} ${ABSL_INTERNAL_INCLUDE_WARNING_GUARD}
PUBLIC
"$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
target_compile_options(${_NAME}
PRIVATE ${ABSL_CC_LIB_COPTS})
target_compile_definitions(${_NAME} PUBLIC ${ABSL_CC_LIB_DEFINES})
# Add all Abseil targets to a a folder in the IDE for organization.
if(ABSL_CC_LIB_PUBLIC)
set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER})
elseif(ABSL_CC_LIB_TESTONLY)
set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
else()
set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/internal)
endif()
if(ABSL_PROPAGATE_CXX_STD)
# Abseil libraries require C++17 as the current minimum standard. When
# compiled with a higher standard (either because it is the compiler's
# default or explicitly requested), then Abseil requires that standard.
target_compile_features(${_NAME} PUBLIC ${ABSL_INTERNAL_CXX_STD_FEATURE})
endif()
# When being installed, we lose the absl_ prefix. We want to put it back
# to have properly named lib files. This is a no-op when we are not being
# installed.
if(ABSL_ENABLE_INSTALL)
set_target_properties(${_NAME} PROPERTIES
OUTPUT_NAME "absl_${_NAME}"
SOVERSION "${ABSL_SOVERSION}"
)
endif()
else()
# Generating header-only library
add_library(${_NAME} INTERFACE)
target_include_directories(${_NAME} ${ABSL_INTERNAL_INCLUDE_WARNING_GUARD}
INTERFACE
"$<BUILD_INTERFACE:${ABSL_COMMON_INCLUDE_DIRS}>"
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
if (_build_type STREQUAL "dll")
set(ABSL_CC_LIB_DEPS abseil_dll)
endif()
target_link_libraries(${_NAME}
INTERFACE
${ABSL_CC_LIB_DEPS}
${ABSL_CC_LIB_LINKOPTS}
${ABSL_DEFAULT_LINKOPTS}
)
target_compile_definitions(${_NAME} INTERFACE ${ABSL_CC_LIB_DEFINES})
if(ABSL_PROPAGATE_CXX_STD)
# Abseil libraries require C++17 as the current minimum standard.
# Top-level application CMake projects should ensure a consistent C++
# standard for all compiled sources by setting CMAKE_CXX_STANDARD.
target_compile_features(${_NAME} INTERFACE ${ABSL_INTERNAL_CXX_STD_FEATURE})
endif()
endif()
if(ABSL_ENABLE_INSTALL)
install(TARGETS ${_NAME} EXPORT ${PROJECT_NAME}Targets
RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
)
endif()
add_library(absl::${ABSL_CC_LIB_NAME} ALIAS ${_NAME})
endfunction()
# absl_cc_test()
#
# CMake function to imitate Bazel's cc_test rule.
#
# Parameters:
# NAME: name of target (see Usage below)
# SRCS: List of source files for the binary
# DEPS: List of other libraries to be linked in to the binary targets
# COPTS: List of private compile options
# DEFINES: List of public defines
# LINKOPTS: List of link options
#
# Note:
# By default, absl_cc_test will always create a binary named absl_${NAME}.
# This will also add it to ctest list as absl_${NAME}.
#
# Usage:
# absl_cc_library(
# NAME
# awesome
# HDRS
# "a.h"
# SRCS
# "a.cc"
# PUBLIC
# )
#
# absl_cc_test(
# NAME
# awesome_test
# SRCS
# "awesome_test.cc"
# DEPS
# absl::awesome
# GTest::gmock
# GTest::gtest_main
# )
function(absl_cc_test)
if(NOT (BUILD_TESTING AND ABSL_BUILD_TESTING))
return()
endif()
cmake_parse_arguments(ABSL_CC_TEST
""
"NAME"
"SRCS;COPTS;DEFINES;LINKOPTS;DEPS"
${ARGN}
)
set(_NAME "absl_${ABSL_CC_TEST_NAME}")
add_executable(${_NAME} "")
target_sources(${_NAME} PRIVATE ${ABSL_CC_TEST_SRCS})
target_include_directories(${_NAME}
PUBLIC ${ABSL_COMMON_INCLUDE_DIRS}
PRIVATE ${absl_gtest_src_dir}/googletest/include ${absl_gtest_src_dir}/googlemock/include
)
if (${ABSL_BUILD_DLL})
target_compile_definitions(${_NAME}
PUBLIC
${ABSL_CC_TEST_DEFINES}
ABSL_CONSUME_DLL
ABSL_CONSUME_TEST_DLL
GTEST_LINKED_AS_SHARED_LIBRARY=1
)
# Replace dependencies on targets inside the DLL with abseil_dll itself.
absl_internal_dll_targets(
DEPS ${ABSL_CC_TEST_DEPS}
OUTPUT ABSL_CC_TEST_DEPS
)
absl_internal_dll_targets(
DEPS ${ABSL_CC_TEST_LINKOPTS}
OUTPUT ABSL_CC_TEST_LINKOPTS
)
else()
target_compile_definitions(${_NAME}
PUBLIC
${ABSL_CC_TEST_DEFINES}
)
endif()
target_compile_options(${_NAME}
PRIVATE ${ABSL_CC_TEST_COPTS}
)
target_link_libraries(${_NAME}
PUBLIC ${ABSL_CC_TEST_DEPS}
PRIVATE ${ABSL_CC_TEST_LINKOPTS}
)
# Add all Abseil targets to a folder in the IDE for organization.
set_property(TARGET ${_NAME} PROPERTY FOLDER ${ABSL_IDE_FOLDER}/test)
if(ABSL_PROPAGATE_CXX_STD)
# Abseil libraries require C++17 as the current minimum standard.
# Top-level application CMake projects should ensure a consistent C++
# standard for all compiled sources by setting CMAKE_CXX_STANDARD.
target_compile_features(${_NAME} PUBLIC ${ABSL_INTERNAL_CXX_STD_FEATURE})
endif()
add_test(NAME ${_NAME} COMMAND ${_NAME})
endfunction()

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cmake_minimum_required(VERSION 3.16)
project(googletest-external NONE)
include(ExternalProject)
ExternalProject_Add(googletest
URL "${absl_gtest_download_url}" # May be empty
SOURCE_DIR "${absl_gtest_src_dir}"
BINARY_DIR "${absl_gtest_build_dir}"
CONFIGURE_COMMAND ""
BUILD_COMMAND ""
INSTALL_COMMAND ""
TEST_COMMAND ""
)

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# Integrates googletest at configure time. Based on the instructions at
# https://github.com/google/googletest/tree/master/googletest#incorporating-into-an-existing-cmake-project
# Set up the external googletest project, downloading the latest from Github
# master if requested.
configure_file(
${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt.in
${CMAKE_BINARY_DIR}/googletest-external/CMakeLists.txt
)
set(ABSL_SAVE_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
set(ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
if (BUILD_SHARED_LIBS)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DGTEST_CREATE_SHARED_LIBRARY=1")
endif()
# Configure and build the googletest source.
execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external )
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-external)
if(result)
message(FATAL_ERROR "Build step for googletest failed: ${result}")
endif()
set(CMAKE_CXX_FLAGS ${ABSL_SAVE_CMAKE_CXX_FLAGS})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${ABSL_SAVE_CMAKE_RUNTIME_OUTPUT_DIRECTORY})
# Prevent overriding the parent project's compiler/linker settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Add googletest directly to our build. This defines the gtest and gtest_main
# targets.
add_subdirectory(${absl_gtest_src_dir} ${absl_gtest_build_dir} EXCLUDE_FROM_ALL)

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# Abseil CMake Build Instructions
Abseil comes with a CMake build script ([CMakeLists.txt](../CMakeLists.txt))
that can be used on a wide range of platforms ("C" stands for cross-platform.).
If you don't have CMake installed already, you can download it for free from
<https://www.cmake.org/>.
CMake works by generating native makefiles or build projects that can
be used in the compiler environment of your choice.
For API/ABI compatibility reasons, we strongly recommend building Abseil in a
subdirectory of your project or as an embedded dependency.
## Incorporating Abseil Into a CMake Project
The recommendations below are similar to those for using CMake within the
googletest framework
(<https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project>)
### Step-by-Step Instructions
1. If you want to build the Abseil tests, integrate the Abseil dependency
[Google Test](https://github.com/google/googletest) into your CMake
project. To disable Abseil tests, you have to pass either
`-DBUILD_TESTING=OFF` or `-DABSL_BUILD_TESTING=OFF` when configuring your
project with CMake.
2. Download Abseil and copy it into a subdirectory in your CMake project or add
Abseil as a [git submodule](https://git-scm.com/docs/git-submodule) in your
CMake project.
3. You can then use the CMake command
[`add_subdirectory()`](https://cmake.org/cmake/help/latest/command/add_subdirectory.html)
to include Abseil directly in your CMake project.
4. Add the **absl::** target you wish to use to the
[`target_link_libraries()`](https://cmake.org/cmake/help/latest/command/target_link_libraries.html)
section of your executable or of your library.<br>
Here is a short CMakeLists.txt example of an application project using Abseil.
```cmake
cmake_minimum_required(VERSION 3.16)
project(my_app_project)
# Pick the C++ standard to compile with.
# Abseil currently supports C++17 and C++20.
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_subdirectory(abseil-cpp)
add_executable(my_exe source.cpp)
target_link_libraries(my_exe absl::base absl::synchronization absl::strings)
```
Note that if you are developing a library designed for use by other clients, you
should instead leave `CMAKE_CXX_STANDARD` unset (or only set if being built as
the current top-level CMake project) and configure the minimum required C++
standard at the target level. If you require a later minimum C++ standard than
Abseil does, it's a good idea to also enforce that `CMAKE_CXX_STANDARD` (which
will control Abseil library targets) is set to at least that minimum. For
example:
```cmake
cmake_minimum_required(VERSION 3.16)
project(my_lib_project)
# Leave C++ standard up to the root application, so set it only if this is the
# current top-level CMake project.
if(CMAKE_SOURCE_DIR STREQUAL my_lib_project_SOURCE_DIR)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
add_subdirectory(abseil-cpp)
add_library(my_lib source.cpp)
target_link_libraries(my_lib absl::base absl::synchronization absl::strings)
# Enforce that my_lib requires C++17. Important to document for clients that they
# must set CMAKE_CXX_STANDARD to 17 or higher for proper Abseil ABI compatibility
# (since otherwise, Abseil library targets could be compiled with a lower C++
# standard than my_lib).
target_compile_features(my_lib PUBLIC cxx_std_17)
if(CMAKE_CXX_STANDARD LESS 17)
message(FATAL_ERROR
"my_lib_project requires CMAKE_CXX_STANDARD >= 17 (got: ${CMAKE_CXX_STANDARD})")
endif()
```
Then the top-level application project that uses your library is responsible for
setting a consistent `CMAKE_CXX_STANDARD` that is sufficiently high.
### Running Abseil Tests with CMake
Use the `-DABSL_BUILD_TESTING=ON` flag to run Abseil tests. Note that
BUILD_TESTING must also be on (the default).
You will need to provide Abseil with a Googletest dependency. There are two
options for how to do this:
* Use `-DABSL_USE_GOOGLETEST_HEAD`. This will automatically download the latest
Googletest source into the build directory at configure time. Googletest will
then be compiled directly alongside Abseil's tests.
* Manually integrate Googletest with your build. See
https://github.com/google/googletest/blob/master/googletest/README.md#using-cmake
for more information on using Googletest in a CMake project.
For example, to run just the Abseil tests, you could use this script:
```
cd path/to/abseil-cpp
mkdir build
cd build
cmake -DABSL_BUILD_TESTING=ON -DABSL_USE_GOOGLETEST_HEAD=ON ..
make -j
ctest
```
Currently, we only run our tests with CMake in a Linux environment, but we are
working on the rest of our supported platforms. See
https://github.com/abseil/abseil-cpp/projects/1 and
https://github.com/abseil/abseil-cpp/issues/109 for more information.
### Available Abseil CMake Public Targets
Here's a non-exhaustive list of Abseil CMake public targets:
```cmake
absl::algorithm
absl::base
absl::debugging
absl::flat_hash_map
absl::flags
absl::memory
absl::meta
absl::numeric
absl::random_random
absl::strings
absl::synchronization
absl::time
absl::utility
```
## Traditional CMake Set-Up
For larger projects, it may make sense to use the traditional CMake set-up where you build and install projects separately.
First, you'd need to build and install Google Test:
```
cmake -S /source/googletest -B /build/googletest -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/installation/dir -DBUILD_GMOCK=ON
cmake --build /build/googletest --target install
```
Then you need to configure and build Abseil. Make sure you enable `ABSL_USE_EXTERNAL_GOOGLETEST` and `ABSL_FIND_GOOGLETEST`. You also need to enable `ABSL_ENABLE_INSTALL` so that you can install Abseil itself.
```
cmake -S /source/abseil-cpp -B /build/abseil-cpp -DCMAKE_PREFIX_PATH=/installation/dir -DCMAKE_INSTALL_PREFIX=/installation/dir -DABSL_ENABLE_INSTALL=ON -DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON
cmake --build /temporary/build/abseil-cpp
```
(`CMAKE_PREFIX_PATH` is where you already have Google Test installed; `CMAKE_INSTALL_PREFIX` is where you want to have Abseil installed; they can be different.)
Run the tests:
```
ctest --test-dir /temporary/build/abseil-cpp
```
And finally install:
```
cmake --build /temporary/build/abseil-cpp --target install
```
# CMake Option Synopsis
## Enable Standard CMake Installation
`-DABSL_ENABLE_INSTALL=ON`
## Google Test Options
`-DABSL_BUILD_TESTING=ON` must be set to enable testing
- Have Abseil download and build Google Test for you: `-DABSL_USE_EXTERNAL_GOOGLETEST=OFF` (default)
- Download and build latest Google Test: `-DABSL_USE_GOOGLETEST_HEAD=ON`
- Download specific Google Test version (ZIP archive): `-DABSL_GOOGLETEST_DOWNLOAD_URL=https://.../version.zip`
- Use Google Test from specific local directory: `-DABSL_LOCAL_GOOGLETEST_DIR=/path/to/googletest`
- Use Google Test included elsewhere in your project: `-DABSL_USE_EXTERNAL_GOOGLETEST=ON`
- Use standard CMake `find_package(CTest)` to find installed Google Test: `-DABSL_USE_EXTERNAL_GOOGLETEST=ON -DABSL_FIND_GOOGLETEST=ON`

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# absl CMake configuration file.
include(CMakeFindDependencyMacro)
find_dependency(Threads)
@PACKAGE_INIT@
include ("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")

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#
# Copyright 2019 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# A simple CMakeLists.txt for testing cmake installation
cmake_minimum_required(VERSION 3.16)
project(absl_cmake_testing CXX)
add_executable(simple simple.cc)
find_package(absl REQUIRED)
target_link_libraries(simple absl::strings absl::config)

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include "absl/base/config.h"
#include "absl/strings/substitute.h"
#if !defined(ABSL_LTS_RELEASE_VERSION) || ABSL_LTS_RELEASE_VERSION != 99998877
#error ABSL_LTS_RELEASE_VERSION is not set correctly.
#endif
#if !defined(ABSL_LTS_RELEASE_PATCH_LEVEL) || ABSL_LTS_RELEASE_PATCH_LEVEL != 0
#error ABSL_LTS_RELEASE_PATCH_LEVEL is not set correctly.
#endif
int main(int argc, char** argv) {
for (int i = 0; i < argc; ++i) {
std::cout << absl::Substitute("Arg $0: $1\n", i, argv[i]);
}
}

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#!/bin/bash
#
# Copyright 2019 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Unit and integration tests for Abseil LTS CMake installation
# Fail on any error. Treat unset variables an error. Print commands as executed.
set -euox pipefail
absl_dir=/abseil-cpp
absl_build_dir=/buildfs
googletest_builddir=/googletest_builddir
googletest_archive="googletest-${ABSL_GOOGLETEST_VERSION}.tar.gz"
project_dir="${absl_dir}/CMake/install_test_project"
project_build_dir=/buildfs/project-build
build_shared_libs="OFF"
if [ "${LINK_TYPE:-}" = "DYNAMIC" ]; then
build_shared_libs="ON"
fi
# Build and install GoogleTest
mkdir "${googletest_builddir}"
pushd "${googletest_builddir}"
curl -L "${ABSL_GOOGLETEST_DOWNLOAD_URL}" --output "${googletest_archive}"
tar -xz -f "${googletest_archive}"
pushd "googletest-${ABSL_GOOGLETEST_VERSION}"
mkdir build
pushd build
cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS="${build_shared_libs}" ..
make -j $(nproc)
make install
ldconfig
popd
popd
popd
# Run the LTS transformations
./create_lts.py 99998877
# Build and install Abseil
pushd "${absl_build_dir}"
cmake "${absl_dir}" \
-DABSL_USE_EXTERNAL_GOOGLETEST=ON \
-DABSL_FIND_GOOGLETEST=ON \
-DCMAKE_BUILD_TYPE=Release \
-DABSL_BUILD_TESTING=ON \
-DBUILD_SHARED_LIBS="${build_shared_libs}"
make -j $(nproc)
ctest -j $(nproc) --output-on-failure
make install
ldconfig
popd
# Test the project against the installed Abseil
mkdir -p "${project_build_dir}"
pushd "${project_build_dir}"
cmake "${project_dir}"
cmake --build . --target simple
output="$(${project_build_dir}/simple "printme" 2>&1)"
if [[ "${output}" != *"Arg 1: printme"* ]]; then
echo "Faulty output on simple project:"
echo "${output}"
exit 1
fi
popd
if ! grep absl::strings "/usr/local/lib/cmake/absl/abslTargets.cmake"; then
cat "/usr/local/lib/cmake/absl/abslTargets.cmake"
echo "CMake targets named incorrectly"
exit 1
fi
pushd "${HOME}"
cat > hello-abseil.cc << EOF
#include <cstdlib>
#include "absl/strings/str_format.h"
int main(int argc, char **argv) {
absl::PrintF("Hello Abseil!\n");
return EXIT_SUCCESS;
}
EOF
if [ "${LINK_TYPE:-}" != "DYNAMIC" ]; then
pc_args=($(pkg-config --cflags --libs --static absl_str_format))
g++ -static -o hello-abseil hello-abseil.cc "${pc_args[@]}"
else
pc_args=($(pkg-config --cflags --libs absl_str_format))
g++ -o hello-abseil hello-abseil.cc "${pc_args[@]}"
fi
hello="$(./hello-abseil)"
[[ "${hello}" == "Hello Abseil!" ]]
popd
echo "Install test complete!"
exit 0

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md
# As of 2024-07-01, CMake 3.16 is the minimum supported version.
cmake_minimum_required(VERSION 3.16)
# Allow the user to specify the CMAKE_MSVC_DEBUG_INFORMATION_FORMAT
if (POLICY CMP0141)
cmake_policy(SET CMP0141 NEW)
endif (POLICY CMP0141)
project(absl LANGUAGES CXX)
set(ABSL_SOVERSION 0)
include(CTest)
# Output directory is correct by default for most build setups. However, when
# building Abseil as a DLL, it is important to have the DLL in the same
# directory as the executable using it. Thus, we put all executables in a single
# /bin directory.
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
# when absl is included as subproject (i.e. using add_subdirectory(abseil-cpp))
# in the source tree of a project that uses it, install rules are disabled.
if(NOT CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
option(ABSL_ENABLE_INSTALL "Enable install rule" OFF)
else()
option(ABSL_ENABLE_INSTALL "Enable install rule" ON)
endif()
set(CMAKE_INSTALL_RPATH "$ORIGIN")
set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ON)
set(CMAKE_BUILD_RPATH_USE_ORIGIN ON)
option(ABSL_PROPAGATE_CXX_STD
"Use CMake C++ standard meta features (e.g. cxx_std_17) that propagate to targets that link to Abseil"
ON)
option(ABSL_USE_SYSTEM_INCLUDES
"Silence warnings in Abseil headers by marking them as SYSTEM includes"
OFF)
list(APPEND CMAKE_MODULE_PATH
${CMAKE_CURRENT_LIST_DIR}/CMake
${CMAKE_CURRENT_LIST_DIR}/absl/copts
)
option(ABSL_MSVC_STATIC_RUNTIME
"Link static runtime libraries"
OFF)
if(ABSL_MSVC_STATIC_RUNTIME)
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
else()
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
endif()
include(CMakePackageConfigHelpers)
include(GNUInstallDirs)
include(AbseilDll)
include(AbseilHelpers)
##
## Using absl targets
##
## all public absl targets are
## exported with the absl:: prefix
##
## e.g absl::base absl::synchronization absl::strings ....
##
## DO NOT rely on the internal targets outside of the prefix
# include current path
list(APPEND ABSL_COMMON_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR})
if("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
set(ABSL_USING_CLANG ON)
else()
set(ABSL_USING_CLANG OFF)
endif()
# find dependencies
## pthread
find_package(Threads REQUIRED)
include(CMakeDependentOption)
option(ABSL_BUILD_TESTING
"If ON, Abseil will build all of Abseil's own tests." OFF)
option(ABSL_BUILD_TEST_HELPERS
"If ON, Abseil will build libraries that you can use to write tests against Abseil code. This option requires that Abseil is configured to use GoogleTest."
OFF)
option(ABSL_USE_EXTERNAL_GOOGLETEST
"If ON, Abseil will assume that the targets for GoogleTest are already provided by the including project. This makes sense when Abseil is used with add_subdirectory." OFF)
cmake_dependent_option(ABSL_FIND_GOOGLETEST
"If ON, Abseil will use find_package(GTest) rather than assuming that GoogleTest is already provided by the including project."
ON
"ABSL_USE_EXTERNAL_GOOGLETEST"
OFF)
option(ABSL_USE_GOOGLETEST_HEAD
"If ON, abseil will download HEAD from GoogleTest at config time." OFF)
set(ABSL_GOOGLETEST_DOWNLOAD_URL "" CACHE STRING "If set, download GoogleTest from this URL")
set(ABSL_LOCAL_GOOGLETEST_DIR "/usr/src/googletest" CACHE PATH
"If ABSL_USE_GOOGLETEST_HEAD is OFF and ABSL_GOOGLETEST_URL is not set, specifies the directory of a local GoogleTest checkout."
)
option(ABSL_BUILD_MONOLITHIC_SHARED_LIBS
"Build Abseil as a single shared library (always enabled for Windows)"
OFF
)
if(NOT BUILD_SHARED_LIBS AND ABSL_BUILD_MONOLITHIC_SHARED_LIBS)
message(WARNING "Not building a shared library because BUILD_SHARED_LIBS is not set. Ignoring ABSL_BUILD_MONOLITHIC_SHARED_LIBS.")
endif()
if((BUILD_TESTING AND ABSL_BUILD_TESTING) OR ABSL_BUILD_TEST_HELPERS)
if (ABSL_USE_EXTERNAL_GOOGLETEST)
if (ABSL_FIND_GOOGLETEST)
find_package(GTest REQUIRED)
elseif(NOT TARGET GTest::gtest)
if(TARGET gtest)
# When Google Test is included directly rather than through find_package, the aliases are missing.
add_library(GTest::gtest ALIAS gtest)
add_library(GTest::gtest_main ALIAS gtest_main)
add_library(GTest::gmock ALIAS gmock)
add_library(GTest::gmock_main ALIAS gmock_main)
else()
message(FATAL_ERROR "ABSL_USE_EXTERNAL_GOOGLETEST is ON and ABSL_FIND_GOOGLETEST is OFF, which means that the top-level project must build the Google Test project. However, the target gtest was not found.")
endif()
endif()
else()
set(absl_gtest_build_dir ${CMAKE_BINARY_DIR}/googletest-build)
if(ABSL_USE_GOOGLETEST_HEAD AND ABSL_GOOGLETEST_DOWNLOAD_URL)
message(FATAL_ERROR "Do not set both ABSL_USE_GOOGLETEST_HEAD and ABSL_GOOGLETEST_DOWNLOAD_URL")
endif()
if(ABSL_USE_GOOGLETEST_HEAD)
set(absl_gtest_download_url "https://github.com/google/googletest/archive/main.zip")
elseif(ABSL_GOOGLETEST_DOWNLOAD_URL)
set(absl_gtest_download_url ${ABSL_GOOGLETEST_DOWNLOAD_URL})
endif()
if(absl_gtest_download_url)
set(absl_gtest_src_dir ${CMAKE_BINARY_DIR}/googletest-src)
else()
set(absl_gtest_src_dir ${ABSL_LOCAL_GOOGLETEST_DIR})
endif()
include(CMake/Googletest/DownloadGTest.cmake)
endif()
endif()
add_subdirectory(absl)
if(ABSL_ENABLE_INSTALL)
# absl:lts-remove-begin(system installation is supported for LTS releases)
# We don't support system-wide installation
list(APPEND SYSTEM_INSTALL_DIRS "/usr/local" "/usr" "/opt/" "/opt/local" "c:/Program Files/${PROJECT_NAME}")
if(NOT DEFINED CMAKE_INSTALL_PREFIX OR CMAKE_INSTALL_PREFIX IN_LIST SYSTEM_INSTALL_DIRS)
message(WARNING "\
The default and system-level install directories are unsupported except in LTS \
releases of Abseil. Please set CMAKE_INSTALL_PREFIX to install Abseil in your \
source or build tree directly.\
")
endif()
# absl:lts-remove-end
# install as a subdirectory only
install(EXPORT ${PROJECT_NAME}Targets
NAMESPACE absl::
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
configure_package_config_file(
CMake/abslConfig.cmake.in
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
# Abseil only has a version in LTS releases. This mechanism is accomplished
# Abseil's internal Copybara (https://github.com/google/copybara) workflows and
# isn't visible in the CMake buildsystem itself.
if(absl_VERSION)
write_basic_package_version_file(
"${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
COMPATIBILITY ExactVersion
)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
)
endif() # absl_VERSION
# Install the headers except for "options.h" which is installed separately.
install(DIRECTORY absl
DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
FILES_MATCHING
PATTERN "*.inc"
PATTERN "*.h"
PATTERN "options.h" EXCLUDE
PATTERN "copts" EXCLUDE
PATTERN "testdata" EXCLUDE
)
# Rewrite options.h to use the compiled ABI.
file(READ "absl/base/options.h" ABSL_INTERNAL_OPTIONS_H_CONTENTS)
# Handle features that require at least C++20.
if (ABSL_INTERNAL_AT_LEAST_CXX20)
foreach(FEATURE "ORDERING")
string(REPLACE
"#define ABSL_OPTION_USE_STD_${FEATURE} 2"
"#define ABSL_OPTION_USE_STD_${FEATURE} 1"
ABSL_INTERNAL_OPTIONS_H_PINNED
"${ABSL_INTERNAL_OPTIONS_H_CONTENTS}")
set(ABSL_INTERNAL_OPTIONS_H_CONTENTS "${ABSL_INTERNAL_OPTIONS_H_PINNED}")
endforeach()
endif()
# Handle features that require at least C++17.
if (ABSL_INTERNAL_AT_LEAST_CXX17)
foreach(FEATURE "ANY" "OPTIONAL" "STRING_VIEW" "VARIANT")
string(REPLACE
"#define ABSL_OPTION_USE_STD_${FEATURE} 2"
"#define ABSL_OPTION_USE_STD_${FEATURE} 1"
ABSL_INTERNAL_OPTIONS_H_PINNED
"${ABSL_INTERNAL_OPTIONS_H_CONTENTS}")
set(ABSL_INTERNAL_OPTIONS_H_CONTENTS "${ABSL_INTERNAL_OPTIONS_H_PINNED}")
endforeach()
endif()
# Any feature that still has the value of 2 (because it was not handled above)
# should be set to 0.
string(REGEX REPLACE
"#define ABSL_OPTION_USE_STD_([^ ]*) 2"
"#define ABSL_OPTION_USE_STD_\\1 0"
ABSL_INTERNAL_OPTIONS_H_PINNED
"${ABSL_INTERNAL_OPTIONS_H_CONTENTS}")
# If the file already exists, check if it matches the new contents.
# This avoids writing the file if it is already up-to-date when the CMake
# generation is triggered and triggering unnecessary rebuilds.
set(ABSL_INTERNAL_OPTIONS_H_PINNED_NEEDS_UPDATE TRUE)
if (EXISTS "${CMAKE_BINARY_DIR}/options-pinned.h")
file(READ "${CMAKE_BINARY_DIR}/options-pinned.h" ABSL_INTERNAL_OPTIONS_PINNED_H_CONTENTS)
if ("${ABSL_INTERNAL_OPTIONS_H_PINNED}" STREQUAL "${ABSL_INTERNAL_OPTIONS_PINNED_H_CONTENTS}")
set(ABSL_INTERNAL_OPTIONS_H_PINNED_NEEDS_UPDATE FALSE)
endif()
endif()
# If the file needs an update, generate it.
if (ABSL_INTERNAL_OPTIONS_H_PINNED_NEEDS_UPDATE)
file(GENERATE OUTPUT "${CMAKE_BINARY_DIR}/options-pinned.h" CONTENT "${ABSL_INTERNAL_OPTIONS_H_PINNED}")
endif()
install(FILES "${CMAKE_BINARY_DIR}/options-pinned.h"
DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/absl/base
RENAME "options.h")
endif() # ABSL_ENABLE_INSTALL

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# How to Contribute to Abseil
We'd love to accept your patches and contributions to this project. There are
just a few small guidelines you need to follow.
NOTE: If you are new to GitHub, please start by reading [Pull Request
howto](https://help.github.com/articles/about-pull-requests/)
## Contributor License Agreement
Contributions to this project must be accompanied by a Contributor License
Agreement. You (or your employer) retain the copyright to your contribution,
this simply gives us permission to use and redistribute your contributions as
part of the project. Head over to <https://cla.developers.google.com/> to see
your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one
(even if it was for a different project), you probably don't need to do it
again.
## Contribution Guidelines
Potential contributors sometimes ask us if the Abseil project is the appropriate
home for their utility library code or for specific functions implementing
missing portions of the standard. Often, the answer to this question is "no".
We’d like to articulate our thinking on this issue so that our choices can be
understood by everyone and so that contributors can have a better intuition
about whether Abseil might be interested in adopting a new library.
### Priorities
Although our mission is to augment the C++ standard library, our goal is not to
provide a full forward-compatible implementation of the latest standard. For us
to consider a library for inclusion in Abseil, it is not enough that a library
is useful. We generally choose to release a library when it meets at least one
of the following criteria:
* **Widespread usage** - Using our internal codebase to help gauge usage, most
of the libraries we've released have tens of thousands of users.
* **Anticipated widespread usage** - Pre-adoption of some standard-compliant
APIs may not have broad adoption initially but can be expected to pick up
usage when it replaces legacy APIs. `absl::from_chars`, for example,
replaces existing code that converts strings to numbers and will therefore
likely see usage growth.
* **High impact** - APIs that provide a key solution to a specific problem,
such as `absl::FixedArray`, have higher impact than usage numbers may signal
and are released because of their importance.
* **Direct support for a library that falls under one of the above** - When we
want access to a smaller library as an implementation detail for a
higher-priority library we plan to release, we may release it, as we did
with portions of `absl/meta/type_traits.h`. One consequence of this is that
the presence of a library in Abseil does not necessarily mean that other
similar libraries would be a high priority.
### API Freeze Consequences
Via the
[Abseil Compatibility Guidelines](https://abseil.io/about/compatibility), we
have promised a large degree of API stability. In particular, we will not make
backward-incompatible changes to released APIs without also shipping a tool or
process that can upgrade our users' code. We are not yet at the point of easily
releasing such tools. Therefore, at this time, shipping a library establishes an
API contract which is borderline unchangeable. (We can add new functionality,
but we cannot easily change existing behavior.) This constraint forces us to
very carefully review all APIs that we ship.
## Coding Style
To keep the source consistent, readable, diffable and easy to merge, we use a
fairly rigid coding style, as defined by the
[google-styleguide](https://github.com/google/styleguide) project. All patches
will be expected to conform to the style outlined
[here](https://google.github.io/styleguide/cppguide.html).
## Guidelines for Pull Requests
* If you are a Googler, it is required that you send us a Piper CL instead of
using the GitHub pull-request process. The code propagation process will
deliver the change to GitHub.
* Create **small PRs** that are narrowly focused on **addressing a single
concern**. We often receive PRs that are trying to fix several things at a
time, but if only one fix is considered acceptable, nothing gets merged and
both author's & review's time is wasted. Create more PRs to address
different concerns and everyone will be happy.
* For speculative changes, consider opening an [Abseil
issue](https://github.com/abseil/abseil-cpp/issues) and discussing it first.
If you are suggesting a behavioral or API change, consider starting with an
[Abseil proposal template](ABSEIL_ISSUE_TEMPLATE.md).
* Provide a good **PR description** as a record of **what** change is being
made and **why** it was made. Link to a GitHub issue if it exists.
* Don't fix code style and formatting unless you are already changing that
line to address an issue. Formatting of modified lines may be done using
`git clang-format`. PRs with irrelevant changes won't be merged. If
you do want to fix formatting or style, do that in a separate PR.
* Unless your PR is trivial, you should expect there will be reviewer comments
that you'll need to address before merging. We expect you to be reasonably
responsive to those comments, otherwise the PR will be closed after 2-3
weeks of inactivity.
* Maintain **clean commit history** and use **meaningful commit messages**.
PRs with messy commit history are difficult to review and won't be merged.
Use `rebase -i upstream/master` to curate your commit history and/or to
bring in latest changes from master (but avoid rebasing in the middle of a
code review).
* Keep your PR up to date with upstream/master (if there are merge conflicts,
we can't really merge your change).
* **All tests need to be passing** before your change can be merged. We
recommend you **run tests locally** (see below)
* Exceptions to the rules can be made if there's a compelling reason for doing
so. That is - the rules are here to serve us, not the other way around, and
the rules need to be serving their intended purpose to be valuable.
* All submissions, including submissions by project members, require review.
## Running Tests
If you have [Bazel](https://bazel.build/) installed, use `bazel test
--test_tag_filters="-benchmark" ...` to run the unit tests.
If you are running the Linux operating system and have
[Docker](https://www.docker.com/) installed, you can also run the `linux_*.sh`
scripts under the `ci/`(https://github.com/abseil/abseil-cpp/tree/master/ci)
directory to test Abseil under a variety of conditions.
## Abseil Committers
The current members of the Abseil engineering team are the only committers at
present.
## Release Process
Abseil lives at head, where latest-and-greatest code can be found.

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monorail: {
component: "Internals>Core"
}
buganizer_public: {
component_id: 1456128
}

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# Abseil FAQ
## Is Abseil the right home for my utility library?
Most often the answer to the question is "no." As both the [About
Abseil](https://abseil.io/about/) page and our [contributing
guidelines](https://github.com/abseil/abseil-cpp/blob/master/CONTRIBUTING.md#contribution-guidelines)
explain, Abseil contains a variety of core C++ library code that is widely used
at [Google](https://www.google.com/). As such, Abseil's primary purpose is to be
used as a dependency by Google's open source C++ projects. While we do hope that
Abseil is also useful to the C++ community at large, this added constraint also
means that we are unlikely to accept a contribution of utility code that isn't
already widely used by Google.
## How to I set the C++ dialect used to build Abseil?
The short answer is that whatever mechanism you choose, you need to make sure
that you set this option consistently at the global level for your entire
project. If, for example, you want to set the C++ dialect to C++17, with
[Bazel](https://bazel/build/) as the build system and `gcc` or `clang` as the
compiler, there several ways to do this:
* Pass `--cxxopt=-std=c++17` on the command line (for example, `bazel build
--cxxopt=-std=c++17 ...`)
* Set the environment variable `BAZEL_CXXOPTS` (for example,
`BAZEL_CXXOPTS=-std=c++17`)
* Add `build --cxxopt=-std=c++17` to your [`.bazelrc`
file](https://docs.bazel.build/versions/master/guide.html#bazelrc)
If you are using CMake as the build system, you'll need to add a line like
`set(CMAKE_CXX_STANDARD 17)` to your top level `CMakeLists.txt` file. If you
are developing a library designed to be used by other clients, you should
instead leave `CMAKE_CXX_STANDARD` unset and configure the minimum C++ standard
required by each of your library targets via `target_compile_features`. See the
[CMake build
instructions](https://github.com/abseil/abseil-cpp/blob/master/CMake/README.md)
for more information.
For a longer answer to this question and to understand why some other approaches
don't work, see the answer to ["What is ABI and why don't you recommend using a
pre-compiled version of
Abseil?"](#what-is-abi-and-why-dont-you-recommend-using-a-pre-compiled-version-of-abseil)
## What is ABI and why don't you recommend using a pre-compiled version of Abseil?
For the purposes of this discussion, you can think of
[ABI](https://en.wikipedia.org/wiki/Application_binary_interface) as the
compiled representation of the interfaces in code. This is in contrast to
[API](https://en.wikipedia.org/wiki/Application_programming_interface), which
you can think of as the interfaces as defined by the code itself. [Abseil has a
strong promise of API compatibility, but does not make any promise of ABI
compatibility](https://abseil.io/about/compatibility). Let's take a look at what
this means in practice.
You might be tempted to do something like this in a
[Bazel](https://bazel.build/) `BUILD` file:
```
# DON'T DO THIS!!!
cc_library(
name = "my_library",
srcs = ["my_library.cc"],
copts = ["-std=c++17"], # May create a mixed-mode compile!
deps = ["@com_google_absl//absl/strings"],
)
```
Applying `-std=c++17` to an individual target in your `BUILD` file is going to
compile that specific target in C++17 mode, but it isn't going to ensure the
Abseil library is built in C++17 mode, since the Abseil library itself is a
different build target. If your code includes an Abseil header, then your
program may contain conflicting definitions of the same
class/function/variable/enum, etc. As a rule, all compile options that affect
the ABI of a program need to be applied to the entire build on a global basis.
C++ has something called the [One Definition
Rule](https://en.wikipedia.org/wiki/One_Definition_Rule) (ODR). C++ doesn't
allow multiple definitions of the same class/function/variable/enum, etc. ODR
violations sometimes result in linker errors, but linkers do not always catch
violations. Uncaught ODR violations can result in strange runtime behaviors or
crashes that can be hard to debug.
If you build the Abseil library and your code using different compile options
that affect ABI, there is a good chance you will run afoul of the One Definition
Rule. Examples of GCC compile options that affect ABI include (but aren't
limited to) language dialect (e.g. `-std=`), optimization level (e.g. `-O2`),
code generation flags (e.g. `-fexceptions`), and preprocessor defines
(e.g. `-DNDEBUG`).
If you use a pre-compiled version of Abseil, (for example, from your Linux
distribution package manager or from something like
[vcpkg](https://github.com/microsoft/vcpkg)) you have to be very careful to
ensure ABI compatibility across the components of your program. The only way you
can be sure your program is going to be correct regarding ABI is to ensure
you've used the exact same compile options as were used to build the
pre-compiled library. This does not mean that Abseil cannot work as part of a
Linux distribution since a knowledgeable binary packager will have ensured that
all packages have been built with consistent compile options. This is one of the
reasons we warn against - though do not outright reject - using Abseil as a
pre-compiled library.
Another possible way that you might afoul of ABI issues is if you accidentally
include two versions of Abseil in your program. Multiple versions of Abseil can
end up within the same binary if your program uses the Abseil library and
another library also transitively depends on Abseil (resulting in what is
sometimes called the diamond dependency problem). In cases such as this you must
structure your build so that all libraries use the same version of Abseil.
[Abseil's strong promise of API compatibility between
releases](https://abseil.io/about/compatibility) means the latest "HEAD" release
of Abseil is almost certainly the right choice if you are doing as we recommend
and building all of your code from source.
For these reasons we recommend you avoid pre-compiled code and build the Abseil
library yourself in a consistent manner with the rest of your code.
## What is "live at head" and how do I do it?
From Abseil's point-of-view, "live at head" means that every Abseil source
release (which happens on an almost daily basis) is either API compatible with
the previous release, or comes with an automated tool that you can run over code
to make it compatible. In practice, the need to use an automated tool is
extremely rare. This means that upgrading from one source release to another
should be a routine practice that can and should be performed often.
We recommend you update to the [latest commit in the `master` branch of
Abseil](https://github.com/abseil/abseil-cpp/commits/master) as often as
possible. Not only will you pick up bug fixes more quickly, but if you have good
automated testing, you will catch and be able to fix any [Hyrum's
Law](https://www.hyrumslaw.com/) dependency problems on an incremental basis
instead of being overwhelmed by them and having difficulty isolating them if you
wait longer between updates.
If you are using the [Bazel](https://bazel.build/) build system and its
[external dependencies](https://docs.bazel.build/versions/master/external.html)
feature, updating the
[`http_archive`](https://docs.bazel.build/versions/master/repo/http.html#http_archive)
rule in your
[`WORKSPACE`](https://docs.bazel.build/versions/master/be/workspace.html) for
`com_google_abseil` to point to the [latest commit in the `master` branch of
Abseil](https://github.com/abseil/abseil-cpp/commits/master) is all you need to
do. For example, on February 11, 2020, the latest commit to the master branch
was `98eb410c93ad059f9bba1bf43f5bb916fc92a5ea`. To update to this commit, you
would add the following snippet to your `WORKSPACE` file:
```
http_archive(
name = "com_google_absl",
urls = ["https://github.com/abseil/abseil-cpp/archive/98eb410c93ad059f9bba1bf43f5bb916fc92a5ea.zip"], # 2020-02-11T18:50:53Z
strip_prefix = "abseil-cpp-98eb410c93ad059f9bba1bf43f5bb916fc92a5ea",
sha256 = "aabf6c57e3834f8dc3873a927f37eaf69975d4b28117fc7427dfb1c661542a87",
)
```
To get the `sha256` of this URL, run `curl -sL --output -
https://github.com/abseil/abseil-cpp/archive/98eb410c93ad059f9bba1bf43f5bb916fc92a5ea.zip
| sha256sum -`.
You can commit the updated `WORKSPACE` file to your source control every time
you update, and if you have good automated testing, you might even consider
automating this.
One thing we don't recommend is using GitHub's `master.zip` files (for example
[https://github.com/abseil/abseil-cpp/archive/master.zip](https://github.com/abseil/abseil-cpp/archive/master.zip)),
which are always the latest commit in the `master` branch, to implement live at
head. Since these `master.zip` URLs are not versioned, you will lose build
reproducibility. In addition, some build systems, including Bazel, will simply
cache this file, which means you won't actually be updating to the latest
release until your cache is cleared or invalidated.

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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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# Copyright 2024 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# https://bazel.build/external/overview#bzlmod
module(
name = "abseil-cpp",
version = "head",
compatibility_level = 1,
)
cc_configure = use_extension("@rules_cc//cc:extensions.bzl",
"cc_configure_extension",
dev_dependency = True)
use_repo(cc_configure, "local_config_cc")
bazel_dep(name = "rules_cc", version = "0.0.17")
bazel_dep(name = "bazel_skylib", version = "1.7.1")
bazel_dep(name = "platforms", version = "0.0.10")
bazel_dep(
name = "google_benchmark",
version = "1.8.5",
dev_dependency = True,
)
# Note: Googletest is NOT a dev_dependency. Some Abseil test utilities
# intended to be used by Abseil users depend on GoogleTest.
bazel_dep(
name = "googletest",
version = "1.16.0",
)

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danilchap@chromium.org
mbonadei@chromium.org
# For .def files updates:
hans@chromium.org

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>NSPrivacyTracking</key>
<false/>
<key>NSPrivacyCollectedDataTypes</key>
<array/>
<key>NSPrivacyTrackingDomains</key>
<array/>
<key>NSPrivacyAccessedAPITypes</key>
<array/>
</dict>
</plist>

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Name: Abseil
Short Name: absl
URL: https://github.com/abseil/abseil-cpp
License: Apache-2.0
License File: LICENSE
Version: N/A
Revision: fd39cfa4670a1f7995ecf0247f04bda757384ad9
Security Critical: yes
Shipped: yes
Description:
This directory contains the source code of Abseil for C++. This can be used by
Chromium, subject to the guidance at
https://chromium.googlesource.com/chromium/src/+/main/styleguide/c++/c++-features.md;
it can be used without restriction by Chromium's dependencies, except that
objects compiled into Chromium itself cannot use anything relying on
absl::base_internal::FastTypeId (see https://crbug.com/1096380).
How to update Abseil:
1. From your source root run third_party/abseil-cpp/roll_abseil.py to download the code from the Abseil git repository and apply chromium specific patches.
2. Update BUILD.gn files to match changes in BUILD.bazel
If there is a new test, add dependcy on it from absl_tests in the
third_party/abseil-cpp/BUILD.gn target
3. From your source root run third_party/abseil-cpp/generate_def_files.py to
regenerate Windows symbol definition files.
4. If abseil adds new features, update styleguide/c++/c++-features.md and add headers for that feature into exclude list in root DEPS
Local Modifications:
* absl/copts.bzl has been translated to //third_party/absl-cpp/BUILD.gn. Both
files contain lists of compiler flags in order to reduce duplication.
* All the BUILD.bazel files have been translated to BUILD.gn files.
* Patches from //third_party/abseil-cpp/patches have been applied.
* Increment this number to silence presubmits about modifying files in
third_party when regenerating absl .def files: 3

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# Abseil - C++ Common Libraries
The repository contains the Abseil C++ library code. Abseil is an open-source
collection of C++ code (compliant to C++17) designed to augment the C++
standard library.
## Table of Contents
- [About Abseil](#about)
- [Quickstart](#quickstart)
- [Building Abseil](#build)
- [Support](#support)
- [Codemap](#codemap)
- [Releases](#releases)
- [License](#license)
- [Links](#links)
<a name="about"></a>
## About Abseil
Abseil is an open-source collection of C++ library code designed to augment
the C++ standard library. The Abseil library code is collected from Google's
own C++ code base, has been extensively tested and used in production, and
is the same code we depend on in our daily coding lives.
In some cases, Abseil provides pieces missing from the C++ standard; in
others, Abseil provides alternatives to the standard for special needs
we've found through usage in the Google code base. We denote those cases
clearly within the library code we provide you.
Abseil is not meant to be a competitor to the standard library; we've
just found that many of these utilities serve a purpose within our code
base, and we now want to provide those resources to the C++ community as
a whole.
<a name="quickstart"></a>
## Quickstart
If you want to just get started, make sure you at least run through the
[Abseil Quickstart](https://abseil.io/docs/cpp/quickstart). The Quickstart
contains information about setting up your development environment, downloading
the Abseil code, running tests, and getting a simple binary working.
<a name="build"></a>
## Building Abseil
[Bazel](https://bazel.build) and [CMake](https://cmake.org/) are the official
build systems for Abseil.
See the [quickstart](https://abseil.io/docs/cpp/quickstart) for more information
on building Abseil using the Bazel build system.
If you require CMake support, please check the [CMake build
instructions](CMake/README.md) and [CMake
Quickstart](https://abseil.io/docs/cpp/quickstart-cmake).
<a name="support"></a>
## Support
Abseil follows Google's [Foundational C++ Support
Policy](https://opensource.google/documentation/policies/cplusplus-support). See
[this
table](https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md)
for a list of currently supported versions compilers, platforms, and build
tools.
<a name="codemap"></a>
## Codemap
Abseil contains the following C++ library components:
* [`base`](absl/base/)
<br /> The `base` library contains initialization code and other code which
all other Abseil code depends on. Code within `base` may not depend on any
other code (other than the C++ standard library).
* [`algorithm`](absl/algorithm/)
<br /> The `algorithm` library contains additions to the C++ `<algorithm>`
library and container-based versions of such algorithms.
* [`cleanup`](absl/cleanup/)
<br /> The `cleanup` library contains the control-flow-construct-like type
`absl::Cleanup` which is used for executing a callback on scope exit.
* [`container`](absl/container/)
<br /> The `container` library contains additional STL-style containers,
including Abseil's unordered "Swiss table" containers.
* [`crc`](absl/crc/) The `crc` library contains code for
computing error-detecting cyclic redundancy checks on data.
* [`debugging`](absl/debugging/)
<br /> The `debugging` library contains code useful for enabling leak
checks, and stacktrace and symbolization utilities.
* [`flags`](absl/flags/)
<br /> The `flags` library contains code for handling command line flags for
libraries and binaries built with Abseil.
* [`hash`](absl/hash/)
<br /> The `hash` library contains the hashing framework and default hash
functor implementations for hashable types in Abseil.
* [`log`](absl/log/)
<br /> The `log` library contains `LOG` and `CHECK` macros and facilities
for writing logged messages out to disk, `stderr`, or user-extensible
destinations.
* [`memory`](absl/memory/)
<br /> The `memory` library contains memory management facilities that augment
C++'s `<memory>` library.
* [`meta`](absl/meta/)
<br /> The `meta` library contains type checks
similar to those available in the C++ `<type_traits>` library.
* [`numeric`](absl/numeric/)
<br /> The `numeric` library contains 128-bit integer types as well as
implementations of C++20's bitwise math functions.
* [`profiling`](absl/profiling/)
<br /> The `profiling` library contains utility code for profiling C++
entities. It is currently a private dependency of other Abseil libraries.
* [`random`](absl/random/)
<br /> The `random` library contains functions for generating pseudorandom
values.
* [`status`](absl/status/)
<br /> The `status` library contains abstractions for error handling,
specifically `absl::Status` and `absl::StatusOr<T>`.
* [`strings`](absl/strings/)
<br /> The `strings` library contains a variety of strings routines and
utilities.
* [`synchronization`](absl/synchronization/)
<br /> The `synchronization` library contains concurrency primitives (Abseil's
`absl::Mutex` class, an alternative to `std::mutex`) and a variety of
synchronization abstractions.
* [`time`](absl/time/)
<br /> The `time` library contains abstractions for computing with absolute
points in time, durations of time, and formatting and parsing time within
time zones.
* [`types`](absl/types/)
<br /> The `types` library contains non-container utility types.
* [`utility`](absl/utility/)
<br /> The `utility` library contains utility and helper code.
<a name="releases"></a>
## Releases
Abseil recommends users "live-at-head" (update to the latest commit from the
master branch as often as possible). However, we realize this philosophy doesn't
work for every project, so we also provide [Long Term Support
Releases](https://github.com/abseil/abseil-cpp/releases) to which we backport
fixes for severe bugs. See our [release
management](https://abseil.io/about/releases) document for more details.
<a name="license"></a>
## License
The Abseil C++ library is licensed under the terms of the Apache
license. See [LICENSE](LICENSE) for more information.
<a name="links"></a>
## Links
For more information about Abseil:
* Consult our [Abseil Introduction](https://abseil.io/about/intro)
* Read [Why Adopt Abseil](https://abseil.io/about/philosophy) to understand our
design philosophy.
* Peruse our
[Abseil Compatibility Guarantees](https://abseil.io/about/compatibility) to
understand both what we promise to you, and what we expect of you in return.

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# C++ Upgrade Tools
Abseil may occasionally release API-breaking changes. As noted in our
[Compatibility Guidelines][compatibility-guide], we will aim to provide a tool
to do the work of effecting such API-breaking changes, when absolutely
necessary.
These tools will be listed on the [C++ Upgrade Tools][upgrade-tools] guide on
https://abseil.io.
For more information, the [C++ Automated Upgrade Guide][api-upgrades-guide]
outlines this process.
[compatibility-guide]: https://abseil.io/about/compatibility
[api-upgrades-guide]: https://abseil.io/docs/cpp/tools/api-upgrades
[upgrade-tools]: https://abseil.io/docs/cpp/tools/upgrades/

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# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# This file contains the definition of the template absl_source_set which
# should be the only type of target needed in abseil's BUILD.gn files.
# This template will correctly set "configs" and "public_configs" in order
# to correctly compile abseil in Chromium.
#
# Usage:
# Most of the times its usage will be similar to the example below but all
# the arguments avilable in source_set are also available for absl_source_set.
#
# absl_source_set("foo") {
# sources = [ "foo.cc" ]
# public = [ "foo.h" ]
# deps = [ ":bar" ]
# }
import("//build_overrides/build.gni")
declare_args() {
absl_build_tests = build_with_chromium
}
template("absl_source_set") {
source_set(target_name) {
if (defined(invoker.testonly) && invoker.testonly && !absl_build_tests) {
not_needed(invoker, "*")
} else {
forward_variables_from(invoker, "*")
configs -= [ "//build/config/compiler:chromium_code" ]
configs += [
"//build/config/compiler:no_chromium_code",
"//build/config/compiler:prevent_unsafe_narrowing",
"//third_party/abseil-cpp:absl_default_cflags_cc",
"//third_party/abseil-cpp:absl_define_config",
]
if (!defined(defines)) {
defines = []
}
if (is_component_build) {
defines += [ "ABSL_BUILD_DLL" ]
if (!is_win && current_os != "aix") {
configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
configs += [ "//build/config/gcc:symbol_visibility_default" ]
}
}
if (!defined(public_configs)) {
public_configs = []
}
public_configs += [ "//third_party/abseil-cpp:absl_include_config" ]
if (!defined(visibility)) {
# Within Chromium builds, restrict direct visibility of Abseil sources, so
# users must depend on //third_party/abseil-cpp:absl. This prevents use of
# banned targets like absl/types:any. A few targets require exceptions.
if (build_with_chromium) {
visibility = [
# Abseil itself.
"//third_party/abseil-cpp/*",
# GTest. It unconditionally #includes any.h if pretty-print support
# for absl types is enabled.
"//third_party/googletest/*",
]
if (!is_component_build) {
visibility += [
# Not used by Chromium directly.
"//chromecast/internal/*",
"//libassistant/*",
]
}
} else {
visibility = [ "*" ]
}
}
}
}
}
template("absl_test") {
source_set(target_name) {
if (!absl_build_tests) {
not_needed(invoker, "*")
} else {
forward_variables_from(invoker, "*")
testonly = true
configs -= [ "//build/config/compiler:chromium_code" ]
configs += [
"//build/config/compiler:no_chromium_code",
"//third_party/abseil-cpp:absl_default_cflags_cc",
"//third_party/abseil-cpp:absl_define_config",
"//third_party/abseil-cpp:absl_test_config",
]
if (!defined(public_configs)) {
public_configs = []
}
public_configs += [ "//third_party/abseil-cpp:absl_include_config" ]
visibility = [ "//third_party/abseil-cpp/:*" ]
deps += [
"//third_party/googletest:gmock",
"//third_party/googletest:gtest",
]
}
}
}

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
load("@bazel_skylib//lib:selects.bzl", "selects")
package(default_visibility = ["//visibility:public"])
licenses(["notice"])
config_setting(
name = "clang_compiler",
flag_values = {
"@bazel_tools//tools/cpp:compiler": "clang",
},
visibility = [":__subpackages__"],
)
config_setting(
name = "mingw_unspecified_compiler",
flag_values = {
"@bazel_tools//tools/cpp:compiler": "mingw",
},
visibility = [":__subpackages__"],
)
config_setting(
name = "mingw-gcc_compiler",
flag_values = {
"@bazel_tools//tools/cpp:compiler": "mingw-gcc",
},
visibility = [":__subpackages__"],
)
config_setting(
name = "fuchsia",
constraint_values = [
"@platforms//os:fuchsia",
],
visibility = [":__subpackages__"],
)
selects.config_setting_group(
name = "mingw_compiler",
match_any = [
":mingw_unspecified_compiler",
":mingw-gcc_compiler",
],
visibility = [":__subpackages__"],
)

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
add_subdirectory(base)
add_subdirectory(algorithm)
add_subdirectory(cleanup)
add_subdirectory(container)
add_subdirectory(crc)
add_subdirectory(debugging)
add_subdirectory(flags)
add_subdirectory(functional)
add_subdirectory(hash)
add_subdirectory(log)
add_subdirectory(memory)
add_subdirectory(meta)
add_subdirectory(numeric)
add_subdirectory(profiling)
add_subdirectory(random)
add_subdirectory(status)
add_subdirectory(strings)
add_subdirectory(synchronization)
add_subdirectory(time)
add_subdirectory(types)
add_subdirectory(utility)
if (ABSL_BUILD_DLL)
absl_make_dll()
if ((BUILD_TESTING AND ABSL_BUILD_TESTING) OR ABSL_BUILD_TEST_HELPERS)
absl_make_dll(TEST ON)
endif()
endif()

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""This script generates abseil.podspec from all BUILD.bazel files.
This is expected to run on abseil git repository with Bazel 1.0 on Linux.
It recursively analyzes BUILD.bazel files using query command of Bazel to
dump its build rules in XML format. From these rules, it constructs podspec
structure.
"""
import argparse
import collections
import os
import re
import subprocess
import xml.etree.ElementTree
# Template of root podspec.
SPEC_TEMPLATE = """
# This file has been automatically generated from a script.
# Please make modifications to `abseil.podspec.gen.py` instead.
Pod::Spec.new do |s|
s.name = 'abseil'
s.version = '${version}'
s.summary = 'Abseil Common Libraries (C++) from Google'
s.homepage = 'https://abseil.io'
s.license = 'Apache License, Version 2.0'
s.authors = { 'Abseil Team' => 'abseil-io@googlegroups.com' }
s.source = {
:git => 'https://github.com/abseil/abseil-cpp.git',
:tag => '${tag}',
}
s.resource_bundles = {
s.module_name => 'PrivacyInfo.xcprivacy',
}
s.module_name = 'absl'
s.header_mappings_dir = 'absl'
s.header_dir = 'absl'
s.libraries = 'c++'
s.compiler_flags = '-Wno-everything'
s.pod_target_xcconfig = {
'USER_HEADER_SEARCH_PATHS' => '$(inherited) "$(PODS_TARGET_SRCROOT)"',
'USE_HEADERMAP' => 'NO',
'ALWAYS_SEARCH_USER_PATHS' => 'NO',
}
s.ios.deployment_target = '12.0'
s.osx.deployment_target = '10.13'
s.tvos.deployment_target = '12.0'
s.watchos.deployment_target = '4.0'
s.visionos.deployment_target = '1.0'
s.subspec 'xcprivacy' do |ss|
ss.resource_bundles = {
ss.module_name => 'PrivacyInfo.xcprivacy',
}
end
"""
# Rule object representing the rule of Bazel BUILD.
Rule = collections.namedtuple(
"Rule", "type name package srcs hdrs textual_hdrs deps visibility testonly")
def get_elem_value(elem, name):
"""Returns the value of XML element with the given name."""
for child in elem:
if child.attrib.get("name") != name:
continue
if child.tag == "string":
return child.attrib.get("value")
if child.tag == "boolean":
return child.attrib.get("value") == "true"
if child.tag == "list":
return [nested_child.attrib.get("value") for nested_child in child]
raise "Cannot recognize tag: " + child.tag
return None
def normalize_paths(paths):
"""Returns the list of normalized path."""
# e.g. ["//absl/strings:dir/header.h"] -> ["absl/strings/dir/header.h"]
return [path.lstrip("/").replace(":", "/") for path in paths]
def parse_rule(elem, package):
"""Returns a rule from bazel XML rule."""
return Rule(
type=elem.attrib["class"],
name=get_elem_value(elem, "name"),
package=package,
srcs=normalize_paths(get_elem_value(elem, "srcs") or []),
hdrs=normalize_paths(get_elem_value(elem, "hdrs") or []),
textual_hdrs=normalize_paths(get_elem_value(elem, "textual_hdrs") or []),
deps=get_elem_value(elem, "deps") or [],
visibility=get_elem_value(elem, "visibility") or [],
testonly=get_elem_value(elem, "testonly") or False)
def read_build(package):
"""Runs bazel query on given package file and returns all cc rules."""
result = subprocess.check_output(
["bazel", "query", package + ":all", "--output", "xml"])
root = xml.etree.ElementTree.fromstring(result)
return [
parse_rule(elem, package)
for elem in root
if elem.tag == "rule" and elem.attrib["class"].startswith("cc_")
]
def collect_rules(root_path):
"""Collects and returns all rules from root path recursively."""
rules = []
for cur, _, _ in os.walk(root_path):
build_path = os.path.join(cur, "BUILD.bazel")
if os.path.exists(build_path):
rules.extend(read_build("//" + cur))
return rules
def relevant_rule(rule):
"""Returns true if a given rule is relevant when generating a podspec."""
return (
# cc_library only (ignore cc_test, cc_binary)
rule.type == "cc_library" and
# ignore empty rule
(rule.hdrs + rule.textual_hdrs + rule.srcs) and
# ignore test-only rule
not rule.testonly)
def get_spec_var(depth):
"""Returns the name of variable for spec with given depth."""
return "s" if depth == 0 else "s{}".format(depth)
def get_spec_name(label):
"""Converts the label of bazel rule to the name of podspec."""
assert label.startswith("//absl/"), "{} doesn't start with //absl/".format(
label)
# e.g. //absl/apple/banana -> abseil/apple/banana
return "abseil/" + label[7:]
def write_podspec(f, rules, args):
"""Writes a podspec from given rules and args."""
rule_dir = build_rule_directory(rules)["abseil"]
# Write root part with given arguments
spec = re.sub(r"\$\{(\w+)\}", lambda x: args[x.group(1)],
SPEC_TEMPLATE).lstrip()
f.write(spec)
# Write all target rules
write_podspec_map(f, rule_dir, 0)
f.write("end\n")
def build_rule_directory(rules):
"""Builds a tree-style rule directory from given rules."""
rule_dir = {}
for rule in rules:
cur = rule_dir
for frag in get_spec_name(rule.package).split("/"):
cur = cur.setdefault(frag, {})
cur[rule.name] = rule
return rule_dir
def write_podspec_map(f, cur_map, depth):
"""Writes podspec from rule map recursively."""
for key, value in sorted(cur_map.items()):
indent = " " * (depth + 1)
f.write("{indent}{var0}.subspec '{key}' do |{var1}|\n".format(
indent=indent,
key=key,
var0=get_spec_var(depth),
var1=get_spec_var(depth + 1)))
if isinstance(value, dict):
write_podspec_map(f, value, depth + 1)
else:
write_podspec_rule(f, value, depth + 1)
f.write("{indent}end\n".format(indent=indent))
def write_podspec_rule(f, rule, depth):
"""Writes podspec from given rule."""
indent = " " * (depth + 1)
spec_var = get_spec_var(depth)
# Puts all files in hdrs, textual_hdrs, and srcs into source_files.
# Since CocoaPods treats header_files a bit differently from bazel,
# this won't generate a header_files field so that all source_files
# are considered as header files.
srcs = sorted(set(rule.hdrs + rule.textual_hdrs + rule.srcs))
write_indented_list(
f, "{indent}{var}.source_files = ".format(indent=indent, var=spec_var),
srcs)
# Writes dependencies of this rule.
for dep in sorted(rule.deps):
name = get_spec_name(dep.replace(":", "/"))
f.write("{indent}{var}.dependency '{dep}'\n".format(
indent=indent, var=spec_var, dep=name))
# Writes dependency to xcprivacy
f.write(
"{indent}{var}.dependency '{dep}'\n".format(
indent=indent, var=spec_var, dep="abseil/xcprivacy"
)
)
def write_indented_list(f, leading, values):
"""Writes leading values in an indented style."""
f.write(leading)
f.write((",\n" + " " * len(leading)).join("'{}'".format(v) for v in values))
f.write("\n")
def generate(args):
"""Generates a podspec file from all BUILD files under absl directory."""
rules = filter(relevant_rule, collect_rules("absl"))
with open(args.output, "wt") as f:
write_podspec(f, rules, vars(args))
def main():
parser = argparse.ArgumentParser(
description="Generates abseil.podspec from BUILD.bazel")
parser.add_argument(
"-v", "--version", help="The version of podspec", required=True)
parser.add_argument(
"-t",
"--tag",
default=None,
help="The name of git tag (default: version)")
parser.add_argument(
"-o",
"--output",
default="abseil.podspec",
help="The name of output file (default: abseil.podspec)")
args = parser.parse_args()
if args.tag is None:
args.tag = args.version
generate(args)
if __name__ == "__main__":
main()

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
load(
"//absl:copts/configure_copts.bzl",
"ABSL_DEFAULT_COPTS",
"ABSL_DEFAULT_LINKOPTS",
"ABSL_TEST_COPTS",
)
package(
default_visibility = ["//visibility:public"],
features = [
"header_modules",
"layering_check",
"parse_headers",
],
)
licenses(["notice"])
cc_library(
name = "algorithm",
hdrs = ["algorithm.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
"//absl/base:config",
],
)
cc_test(
name = "algorithm_test",
size = "small",
srcs = ["algorithm_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":algorithm",
"//absl/base:config",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "container",
hdrs = [
"container.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":algorithm",
"//absl/base:config",
"//absl/base:core_headers",
"//absl/base:nullability",
"//absl/meta:type_traits",
],
)
cc_test(
name = "container_test",
srcs = ["container_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":container",
"//absl/base",
"//absl/base:config",
"//absl/base:core_headers",
"//absl/memory",
"//absl/types:span",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)

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# Copyright 2018 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//third_party/abseil-cpp/absl.gni")
absl_source_set("algorithm") {
public = [ "algorithm.h" ]
deps = [ "//third_party/abseil-cpp/absl/base:config" ]
}
absl_source_set("container") {
public = [ "container.h" ]
deps = [
":algorithm",
"//third_party/abseil-cpp/absl/base:config",
"//third_party/abseil-cpp/absl/base:core_headers",
"//third_party/abseil-cpp/absl/base:nullability",
"//third_party/abseil-cpp/absl/meta:type_traits",
]
}
absl_test("algorithm_test") {
sources = [ "algorithm_test.cc" ]
deps = [
":algorithm",
"//third_party/abseil-cpp/absl/base:config",
]
}
absl_test("container_test") {
sources = [ "container_test.cc" ]
deps = [
":container",
"//third_party/abseil-cpp/absl/base",
"//third_party/abseil-cpp/absl/base:config",
"//third_party/abseil-cpp/absl/base:core_headers",
"//third_party/abseil-cpp/absl/memory",
"//third_party/abseil-cpp/absl/types:span",
]
}

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
absl_cc_library(
NAME
algorithm
HDRS
"algorithm.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
PUBLIC
)
absl_cc_test(
NAME
algorithm_test
SRCS
"algorithm_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::algorithm
absl::config
GTest::gmock_main
)
absl_cc_library(
NAME
algorithm_container
HDRS
"container.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::algorithm
absl::config
absl::core_headers
absl::meta
absl::nullability
PUBLIC
)
absl_cc_test(
NAME
container_test
SRCS
"container_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::algorithm_container
absl::base
absl::config
absl::core_headers
absl::memory
absl::span
GTest::gmock_main
)

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: algorithm.h
// -----------------------------------------------------------------------------
//
// This header file contains Google extensions to the standard <algorithm> C++
// header.
#ifndef ABSL_ALGORITHM_ALGORITHM_H_
#define ABSL_ALGORITHM_ALGORITHM_H_
#include <algorithm>
#include <iterator>
#include <type_traits>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
// equal()
// rotate()
//
// Historical note: Abseil once provided implementations of these algorithms
// prior to their adoption in C++14. New code should prefer to use the std
// variants.
//
// See the documentation for the STL <algorithm> header for more information:
// https://en.cppreference.com/w/cpp/header/algorithm
using std::equal;
using std::rotate;
// linear_search()
//
// Performs a linear search for `value` using the iterator `first` up to
// but not including `last`, returning true if [`first`, `last`) contains an
// element equal to `value`.
//
// A linear search is of O(n) complexity which is guaranteed to make at most
// n = (`last` - `first`) comparisons. A linear search over short containers
// may be faster than a binary search, even when the container is sorted.
template <typename InputIterator, typename EqualityComparable>
ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20 bool linear_search(
InputIterator first, InputIterator last, const EqualityComparable& value) {
return std::find(first, last, value) != last;
}
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_ALGORITHM_ALGORITHM_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/algorithm/algorithm.h"
#include <array>
#include <vector>
#include "gtest/gtest.h"
#include "absl/base/config.h"
namespace {
class LinearSearchTest : public testing::Test {
protected:
LinearSearchTest() : container_{1, 2, 3} {}
static bool Is3(int n) { return n == 3; }
static bool Is4(int n) { return n == 4; }
std::vector<int> container_;
};
TEST_F(LinearSearchTest, linear_search) {
EXPECT_TRUE(absl::linear_search(container_.begin(), container_.end(), 3));
EXPECT_FALSE(absl::linear_search(container_.begin(), container_.end(), 4));
}
TEST_F(LinearSearchTest, linear_searchConst) {
const std::vector<int> *const const_container = &container_;
EXPECT_TRUE(
absl::linear_search(const_container->begin(), const_container->end(), 3));
EXPECT_FALSE(
absl::linear_search(const_container->begin(), const_container->end(), 4));
}
#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
TEST_F(LinearSearchTest, Constexpr) {
static constexpr std::array<int, 3> kArray = {1, 2, 3};
static_assert(absl::linear_search(kArray.begin(), kArray.end(), 3));
static_assert(!absl::linear_search(kArray.begin(), kArray.end(), 4));
}
#endif // defined(ABSL_INTERNAL_CPLUSPLUS_LANG) &&
// ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
} // namespace

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#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
load(
"//absl:copts/configure_copts.bzl",
"ABSL_DEFAULT_COPTS",
"ABSL_DEFAULT_LINKOPTS",
"ABSL_TEST_COPTS",
)
package(
default_visibility = ["//visibility:public"],
features = [
"header_modules",
"layering_check",
"parse_headers",
],
)
licenses(["notice"])
cc_library(
name = "atomic_hook",
hdrs = ["internal/atomic_hook.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
":core_headers",
],
)
cc_library(
name = "errno_saver",
hdrs = ["internal/errno_saver.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [":config"],
)
cc_library(
name = "log_severity",
srcs = ["log_severity.cc"],
hdrs = ["log_severity.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
],
)
cc_library(
name = "no_destructor",
hdrs = ["no_destructor.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":nullability",
],
)
cc_library(
name = "nullability",
srcs = ["internal/nullability_impl.h"],
hdrs = ["nullability.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
"//absl/meta:type_traits",
],
)
cc_library(
name = "raw_logging_internal",
srcs = ["internal/raw_logging.cc"],
hdrs = ["internal/raw_logging.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":atomic_hook",
":config",
":core_headers",
":errno_saver",
":log_severity",
],
)
cc_library(
name = "spinlock_wait",
srcs = [
"internal/spinlock_akaros.inc",
"internal/spinlock_linux.inc",
"internal/spinlock_posix.inc",
"internal/spinlock_wait.cc",
"internal/spinlock_win32.inc",
],
hdrs = ["internal/spinlock_wait.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/base:__pkg__",
],
deps = [
":base_internal",
":core_headers",
":errno_saver",
],
)
cc_library(
name = "config",
hdrs = [
"config.h",
"options.h",
"policy_checks.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
)
cc_library(
name = "cycleclock_internal",
hdrs = [
"internal/cycleclock_config.h",
"internal/unscaledcycleclock_config.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":base_internal",
":config",
],
)
cc_library(
name = "dynamic_annotations",
hdrs = [
"dynamic_annotations.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
],
)
cc_library(
name = "core_headers",
hdrs = [
"attributes.h",
"const_init.h",
"macros.h",
"optimization.h",
"port.h",
"thread_annotations.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
],
)
cc_library(
name = "malloc_internal",
srcs = [
"internal/low_level_alloc.cc",
],
hdrs = [
"internal/direct_mmap.h",
"internal/low_level_alloc.h",
],
copts = ABSL_DEFAULT_COPTS + select({
"//conditions:default": [],
}),
linkopts = select({
"@rules_cc//cc/compiler:msvc-cl": [],
"@rules_cc//cc/compiler:clang-cl": [],
"@rules_cc//cc/compiler:emscripten": [],
"//conditions:default": ["-pthread"],
}) + ABSL_DEFAULT_LINKOPTS,
visibility = [
"//visibility:public",
],
deps = [
":base",
":base_internal",
":config",
":core_headers",
":dynamic_annotations",
":raw_logging_internal",
],
)
cc_library(
name = "base_internal",
hdrs = [
"internal/hide_ptr.h",
"internal/identity.h",
"internal/scheduling_mode.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
"//absl/meta:type_traits",
],
)
cc_library(
name = "base",
srcs = [
"internal/cycleclock.cc",
"internal/spinlock.cc",
"internal/sysinfo.cc",
"internal/thread_identity.cc",
"internal/unscaledcycleclock.cc",
],
hdrs = [
"call_once.h",
"casts.h",
"internal/cycleclock.h",
"internal/low_level_scheduling.h",
"internal/per_thread_tls.h",
"internal/spinlock.h",
"internal/sysinfo.h",
"internal/thread_identity.h",
"internal/tsan_mutex_interface.h",
"internal/unscaledcycleclock.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = select({
"@rules_cc//cc/compiler:msvc-cl": [
"-DEFAULTLIB:advapi32.lib",
],
"@rules_cc//cc/compiler:clang-cl": [
"-DEFAULTLIB:advapi32.lib",
],
"//absl:mingw_compiler": [
"-DEFAULTLIB:advapi32.lib",
"-ladvapi32",
],
"@rules_cc//cc/compiler:emscripten": [],
"//conditions:default": ["-pthread"],
}) + ABSL_DEFAULT_LINKOPTS,
deps = [
":atomic_hook",
":base_internal",
":config",
":core_headers",
":cycleclock_internal",
":dynamic_annotations",
":log_severity",
":nullability",
":raw_logging_internal",
":spinlock_wait",
"//absl/meta:type_traits",
],
)
cc_library(
name = "atomic_hook_test_helper",
testonly = True,
srcs = ["internal/atomic_hook_test_helper.cc"],
hdrs = ["internal/atomic_hook_test_helper.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":atomic_hook",
":core_headers",
],
)
cc_test(
name = "atomic_hook_test",
size = "small",
srcs = ["internal/atomic_hook_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":atomic_hook",
":atomic_hook_test_helper",
":core_headers",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "bit_cast_test",
size = "small",
srcs = [
"bit_cast_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":base",
":core_headers",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "attributes_test",
srcs = [
"attributes_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "c_header_test",
srcs = ["c_header_test.c"],
tags = [
"no_test_wasm",
],
deps = [
":config",
":core_headers",
],
)
cc_library(
name = "throw_delegate",
srcs = ["internal/throw_delegate.cc"],
hdrs = ["internal/throw_delegate.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
":raw_logging_internal",
],
)
cc_test(
name = "throw_delegate_test",
srcs = ["throw_delegate_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":throw_delegate",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "errno_saver_test",
size = "small",
srcs = ["internal/errno_saver_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":errno_saver",
":strerror",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "exception_testing",
testonly = True,
hdrs = ["internal/exception_testing.h"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
"@googletest//:gtest",
],
)
cc_library(
name = "pretty_function",
hdrs = ["internal/pretty_function.h"],
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
)
cc_library(
name = "exception_safety_testing",
testonly = True,
srcs = ["internal/exception_safety_testing.cc"],
hdrs = ["internal/exception_safety_testing.h"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":pretty_function",
"//absl/memory",
"//absl/meta:type_traits",
"//absl/strings",
"//absl/utility",
"@googletest//:gtest",
],
)
cc_test(
name = "exception_safety_testing_test",
srcs = ["exception_safety_testing_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":exception_safety_testing",
"//absl/memory",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
# Common test library made available for use in non-absl code that overrides
# AbslInternalSpinLockDelay and AbslInternalSpinLockWake.
cc_library(
name = "spinlock_test_common",
testonly = True,
srcs = ["spinlock_test_common.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":base",
":base_internal",
":config",
":core_headers",
"//absl/synchronization",
"@googletest//:gtest",
],
alwayslink = 1,
)
cc_test(
name = "spinlock_test",
size = "medium",
srcs = ["spinlock_test_common.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = [
"no_test_wasm",
],
deps = [
":base",
":base_internal",
":config",
":core_headers",
"//absl/synchronization",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "spinlock_benchmark_common",
testonly = True,
srcs = ["internal/spinlock_benchmark.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl/base:__pkg__",
],
deps = [
":base",
":base_internal",
":no_destructor",
":raw_logging_internal",
"//absl/synchronization",
"@google_benchmark//:benchmark_main",
],
alwayslink = 1,
)
cc_binary(
name = "spinlock_benchmark",
testonly = True,
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = ["benchmark"],
visibility = ["//visibility:private"],
deps = [
":spinlock_benchmark_common",
],
)
cc_library(
name = "endian",
hdrs = [
"internal/endian.h",
"internal/unaligned_access.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":base",
":config",
":core_headers",
":nullability",
],
)
cc_test(
name = "endian_test",
srcs = ["internal/endian_test.cc"],
copts = ABSL_TEST_COPTS,
deps = [
":config",
":endian",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "config_test",
srcs = ["config_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
"//absl/synchronization:thread_pool",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "call_once_test",
srcs = ["call_once_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":base",
":core_headers",
"//absl/synchronization",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "no_destructor_test",
srcs = ["no_destructor_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":no_destructor",
":raw_logging_internal",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_binary(
name = "no_destructor_benchmark",
testonly = True,
srcs = ["no_destructor_benchmark.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = ["benchmark"],
visibility = ["//visibility:private"],
deps = [
":no_destructor",
":raw_logging_internal",
"@google_benchmark//:benchmark_main",
],
)
cc_test(
name = "nullability_test",
srcs = ["nullability_test.cc"],
deps = [
":core_headers",
":nullability",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "nullability_default_nonnull_test",
srcs = ["nullability_default_nonnull_test.cc"],
deps = [
":nullability",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "raw_logging_test",
srcs = ["raw_logging_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":raw_logging_internal",
"//absl/strings",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "sysinfo_test",
size = "small",
srcs = ["internal/sysinfo_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":base",
"//absl/synchronization",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "low_level_alloc_test",
size = "medium",
srcs = ["internal/low_level_alloc_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = [
"no_test_ios_x86_64",
"no_test_wasm",
],
deps = [
":malloc_internal",
"//absl/container:node_hash_map",
],
)
cc_test(
name = "thread_identity_test",
size = "small",
srcs = ["internal/thread_identity_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = [
"no_test_wasm",
],
deps = [
":base",
":core_headers",
"//absl/synchronization",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_binary(
name = "thread_identity_benchmark",
testonly = True,
srcs = ["internal/thread_identity_benchmark.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = ["benchmark"],
visibility = ["//visibility:private"],
deps = [
":base",
"//absl/synchronization",
"@google_benchmark//:benchmark_main",
],
)
cc_library(
name = "scoped_set_env",
testonly = True,
srcs = ["internal/scoped_set_env.cc"],
hdrs = ["internal/scoped_set_env.h"],
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
":raw_logging_internal",
],
)
cc_test(
name = "scoped_set_env_test",
size = "small",
srcs = ["internal/scoped_set_env_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":scoped_set_env",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "log_severity_test",
size = "small",
srcs = ["log_severity_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":log_severity",
"//absl/flags:flag_internal",
"//absl/flags:marshalling",
"//absl/strings",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "strerror",
srcs = ["internal/strerror.cc"],
hdrs = ["internal/strerror.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
":core_headers",
":errno_saver",
],
)
cc_test(
name = "strerror_test",
size = "small",
srcs = ["internal/strerror_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":strerror",
"//absl/strings",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_binary(
name = "strerror_benchmark",
testonly = True,
srcs = ["internal/strerror_benchmark.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
tags = ["benchmark"],
visibility = ["//visibility:private"],
deps = [
":strerror",
"@google_benchmark//:benchmark_main",
],
)
cc_library(
name = "fast_type_id",
hdrs = ["internal/fast_type_id.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
],
)
cc_test(
name = "fast_type_id_test",
size = "small",
srcs = ["internal/fast_type_id_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":fast_type_id",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "prefetch",
hdrs = [
"prefetch.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
],
)
cc_test(
name = "prefetch_test",
size = "small",
srcs = [
"prefetch_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":prefetch",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "poison",
srcs = [
"internal/poison.cc",
],
hdrs = ["internal/poison.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
":config",
":core_headers",
":malloc_internal",
],
)
cc_test(
name = "poison_test",
size = "small",
timeout = "short",
srcs = [
"internal/poison_test.cc",
],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":poison",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "unique_small_name_test",
size = "small",
srcs = ["internal/unique_small_name_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
linkstatic = 1,
deps = [
":core_headers",
"//absl/strings",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "optimization_test",
size = "small",
srcs = ["optimization_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":core_headers",
"//absl/types:optional",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "iterator_traits_internal",
hdrs = ["internal/iterator_traits.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
"//absl/meta:type_traits",
],
)
cc_test(
name = "iterator_traits_test",
srcs = ["internal/iterator_traits_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":iterator_traits_internal",
":iterator_traits_test_helper",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_library(
name = "tracing_internal",
srcs = ["internal/tracing.cc"],
hdrs = ["internal/tracing.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
visibility = [
"//absl:__subpackages__",
],
deps = [
"//absl/base:config",
"//absl/base:core_headers",
],
)
cc_library(
name = "iterator_traits_test_helper",
hdrs = ["internal/iterator_traits_test_helper.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [":config"],
)
cc_test(
name = "tracing_internal_weak_test",
srcs = ["internal/tracing_weak_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":tracing_internal",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)
cc_test(
name = "tracing_internal_strong_test",
srcs = ["internal/tracing_strong_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":config",
":core_headers",
":tracing_internal",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)

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# Copyright 2018 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//third_party/abseil-cpp/absl.gni")
absl_source_set("atomic_hook") {
public = [ "internal/atomic_hook.h" ]
deps = [
":config",
":core_headers",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("errno_saver") {
public = [ "internal/errno_saver.h" ]
deps = [ ":config" ]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("log_severity") {
sources = [ "log_severity.cc" ]
public = [ "log_severity.h" ]
deps = [
":config",
":core_headers",
]
}
absl_source_set("no_destructor") {
public = [ "no_destructor.h" ]
deps = [
":config",
":nullability",
]
}
absl_source_set("nullability") {
sources = [ "internal/nullability_impl.h" ]
public = [ "nullability.h" ]
deps = [
":config",
":core_headers",
"//third_party/abseil-cpp/absl/meta:type_traits",
]
}
absl_source_set("raw_logging_internal") {
sources = [ "internal/raw_logging.cc" ]
public = [ "internal/raw_logging.h" ]
deps = [
":atomic_hook",
":config",
":core_headers",
":errno_saver",
":log_severity",
]
visibility = [
"//third_party/abseil-cpp:absl_component_deps",
"//third_party/abseil-cpp/absl/*",
]
}
absl_source_set("spinlock_wait") {
sources = [
"internal/spinlock_akaros.inc",
"internal/spinlock_linux.inc",
"internal/spinlock_posix.inc",
"internal/spinlock_wait.cc",
"internal/spinlock_win32.inc",
]
public = [ "internal/spinlock_wait.h" ]
deps = [
":base_internal",
":core_headers",
":errno_saver",
]
visibility = [ "//third_party/abseil-cpp/absl/base:*" ]
}
absl_source_set("config") {
public = [
"config.h",
"options.h",
"policy_checks.h",
]
}
absl_source_set("cycleclock_internal") {
public = [
"internal/cycleclock_config.h",
"internal/unscaledcycleclock_config.h",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
deps = [
":base_internal",
":config",
]
}
absl_source_set("dynamic_annotations") {
public = [ "dynamic_annotations.h" ]
# Abseil's dynamic annotations are only visible inside Abseil because
# their usage is deprecated in Chromium (see README.chromium for more info).
visibility = [
"//third_party/abseil-cpp:absl_component_deps",
"//third_party/abseil-cpp/absl/*",
]
deps = [
":config",
":core_headers",
]
}
absl_source_set("core_headers") {
public = [
"attributes.h",
"const_init.h",
"macros.h",
"optimization.h",
"port.h",
"thread_annotations.h",
]
deps = [ ":config" ]
}
absl_source_set("malloc_internal") {
sources = [ "internal/low_level_alloc.cc" ]
public = [
"internal/direct_mmap.h",
"internal/low_level_alloc.h",
]
deps = [
":base",
":base_internal",
":config",
":core_headers",
":dynamic_annotations",
":raw_logging_internal",
]
}
absl_source_set("base_internal") {
public = [
"internal/hide_ptr.h",
"internal/identity.h",
"internal/scheduling_mode.h",
]
deps = [
":config",
"//third_party/abseil-cpp/absl/meta:type_traits",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("base") {
sources = [
"internal/cycleclock.cc",
"internal/spinlock.cc",
"internal/sysinfo.cc",
"internal/thread_identity.cc",
"internal/unscaledcycleclock.cc",
]
public = [
"call_once.h",
"casts.h",
"internal/cycleclock.h",
"internal/low_level_scheduling.h",
"internal/per_thread_tls.h",
"internal/spinlock.h",
"internal/sysinfo.h",
"internal/thread_identity.h",
"internal/tsan_mutex_interface.h",
"internal/unscaledcycleclock.h",
]
# TODO(mbonadei): The bazel file has:
# "-DEFAULTLIB:advapi32.lib"
# understand if this is needed here as well.
deps = [
":atomic_hook",
":base_internal",
":config",
":core_headers",
":cycleclock_internal",
":dynamic_annotations",
":log_severity",
":nullability",
":raw_logging_internal",
":spinlock_wait",
"//third_party/abseil-cpp/absl/meta:type_traits",
]
}
absl_test("attributes_test") {
sources = [ "attributes_test.cc" ]
deps = [
":config",
":core_headers",
]
}
if (absl_build_tests) {
import("//testing/test.gni")
test("absl_c_header_test") {
sources = [ "c_header_test.c" ]
deps = [
":config",
":core_headers",
]
}
}
absl_source_set("throw_delegate") {
sources = [ "internal/throw_delegate.cc" ]
public = [ "internal/throw_delegate.h" ]
deps = [
":config",
":raw_logging_internal",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("exception_testing") {
testonly = true
public = [ "internal/exception_testing.h" ]
deps = [ ":config" ]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("pretty_function") {
public = [ "internal/pretty_function.h" ]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("spinlock_test_common") {
testonly = true
sources = [ "spinlock_test_common.cc" ]
deps = [
":base",
":base_internal",
":config",
":core_headers",
"//third_party/abseil-cpp/absl/synchronization",
"//third_party/googletest:gtest",
]
}
absl_source_set("endian") {
public = [
"internal/endian.h",
"internal/unaligned_access.h",
]
deps = [
":base",
":config",
":core_headers",
":nullability",
]
}
absl_source_set("scoped_set_env") {
testonly = true
public = [ "internal/scoped_set_env.h" ]
sources = [ "internal/scoped_set_env.cc" ]
deps = [
":config",
":raw_logging_internal",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("strerror") {
sources = [ "internal/strerror.cc" ]
public = [ "internal/strerror.h" ]
deps = [
":config",
":core_headers",
":errno_saver",
]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("fast_type_id") {
public = [ "internal/fast_type_id.h" ]
deps = [ ":config" ]
visibility = [ "//third_party/abseil-cpp/absl/*" ]
}
absl_source_set("prefetch") {
public = [ "prefetch.h" ]
deps = [
":config",
":core_headers",
]
}
absl_test("prefetch_test") {
sources = [ "prefetch_test.cc" ]
deps = [ ":prefetch" ]
}
absl_source_set("poison") {
public = [ "internal/poison.h" ]
sources = [ "internal/poison.cc" ]
deps = [
":config",
":core_headers",
":malloc_internal",
]
}
absl_test("poison_test") {
sources = [ "internal/poison_test.cc" ]
deps = [
":config",
":poison",
]
}
absl_source_set("iterator_traits_internal") {
public = [ "internal/iterator_traits.h" ]
deps = [
":config",
"//third_party/abseil-cpp/absl/meta:type_traits",
]
}
absl_test("iterator_traits_test") {
sources = [ "internal/iterator_traits_test.cc" ]
deps = [
":config",
":iterator_traits_internal",
":iterator_traits_test_helper",
]
}
absl_source_set("tracing_internal") {
public = [ "internal/tracing.h" ]
sources = [ "internal/tracing.cc" ]
deps = [
":config",
":core_headers",
]
}
absl_source_set("iterator_traits_test_helper") {
public = [ "internal/iterator_traits_test_helper.h" ]
deps = [ ":config" ]
}
absl_test("tracing_internal_weak_test") {
sources = [ "internal/tracing_weak_test.cc" ]
deps = [ ":tracing_internal" ]
}
absl_test("tracing_internal_strong_test") {
sources = [ "internal/tracing_strong_test.cc" ]
deps = [
":config",
":core_headers",
":tracing_internal",
]
}
absl_test("config_test") {
sources = [ "config_test.cc" ]
deps = [
":config",
"//third_party/abseil-cpp/absl/synchronization:thread_pool",
]
}
absl_test("no_destructor_test") {
sources = [ "no_destructor_test.cc" ]
deps = [
":config",
":no_destructor",
":raw_logging_internal",
]
}
absl_test("nullability_test") {
sources = [ "nullability_test.cc" ]
deps = [
":core_headers",
":nullability",
]
}
absl_test("nullability_default_nonnull_test") {
sources = [ "nullability_default_nonnull_test.cc" ]
deps = [ ":nullability" ]
}

843
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@ -0,0 +1,843 @@
#
# Copyright 2017 The Abseil Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
find_library(LIBRT rt)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
atomic_hook
HDRS
"internal/atomic_hook.h"
DEPS
absl::config
absl::core_headers
COPTS
${ABSL_DEFAULT_COPTS}
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
errno_saver
HDRS
"internal/errno_saver.h"
DEPS
absl::config
COPTS
${ABSL_DEFAULT_COPTS}
)
absl_cc_library(
NAME
log_severity
HDRS
"log_severity.h"
SRCS
"log_severity.cc"
DEPS
absl::config
absl::core_headers
COPTS
${ABSL_DEFAULT_COPTS}
)
absl_cc_library(
NAME
no_destructor
HDRS
"no_destructor.h"
DEPS
absl::config
absl::nullability
COPTS
${ABSL_DEFAULT_COPTS}
)
absl_cc_library(
NAME
nullability
HDRS
"nullability.h"
SRCS
"internal/nullability_impl.h"
DEPS
absl::config
absl::core_headers
absl::type_traits
COPTS
${ABSL_DEFAULT_COPTS}
)
absl_cc_test(
NAME
nullability_test
SRCS
"nullability_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::core_headers
absl::nullability
GTest::gtest_main
)
absl_cc_test(
NAME
nullability_default_nonnull_test
SRCS
"nullability_default_nonnull_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::nullability
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
raw_logging_internal
HDRS
"internal/raw_logging.h"
SRCS
"internal/raw_logging.cc"
DEPS
absl::atomic_hook
absl::config
absl::core_headers
absl::errno_saver
absl::log_severity
COPTS
${ABSL_DEFAULT_COPTS}
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
spinlock_wait
HDRS
"internal/spinlock_wait.h"
SRCS
"internal/spinlock_akaros.inc"
"internal/spinlock_linux.inc"
"internal/spinlock_posix.inc"
"internal/spinlock_wait.cc"
"internal/spinlock_win32.inc"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base_internal
absl::core_headers
absl::errno_saver
)
absl_cc_library(
NAME
config
HDRS
"config.h"
"options.h"
"policy_checks.h"
COPTS
${ABSL_DEFAULT_COPTS}
PUBLIC
)
absl_cc_library(
NAME
dynamic_annotations
HDRS
"dynamic_annotations.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
PUBLIC
)
absl_cc_library(
NAME
core_headers
HDRS
"attributes.h"
"const_init.h"
"macros.h"
"optimization.h"
"port.h"
"thread_annotations.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
PUBLIC
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
malloc_internal
HDRS
"internal/direct_mmap.h"
"internal/low_level_alloc.h"
SRCS
"internal/low_level_alloc.cc"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base
absl::base_internal
absl::config
absl::core_headers
absl::dynamic_annotations
absl::raw_logging_internal
Threads::Threads
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
base_internal
HDRS
"internal/hide_ptr.h"
"internal/identity.h"
"internal/scheduling_mode.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
absl::type_traits
)
absl_cc_library(
NAME
base
HDRS
"call_once.h"
"casts.h"
"internal/cycleclock.h"
"internal/cycleclock_config.h"
"internal/low_level_scheduling.h"
"internal/per_thread_tls.h"
"internal/spinlock.h"
"internal/sysinfo.h"
"internal/thread_identity.h"
"internal/tsan_mutex_interface.h"
"internal/unscaledcycleclock.h"
"internal/unscaledcycleclock_config.h"
SRCS
"internal/cycleclock.cc"
"internal/spinlock.cc"
"internal/sysinfo.cc"
"internal/thread_identity.cc"
"internal/unscaledcycleclock.cc"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
$<$<BOOL:${LIBRT}>:-lrt>
$<$<BOOL:${MINGW}>:-ladvapi32>
DEPS
absl::atomic_hook
absl::base_internal
absl::config
absl::core_headers
absl::dynamic_annotations
absl::log_severity
absl::nullability
absl::raw_logging_internal
absl::spinlock_wait
absl::type_traits
Threads::Threads
PUBLIC
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
throw_delegate
HDRS
"internal/throw_delegate.h"
SRCS
"internal/throw_delegate.cc"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
absl::raw_logging_internal
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
exception_testing
HDRS
"internal/exception_testing.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
GTest::gtest
TESTONLY
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
pretty_function
HDRS
"internal/pretty_function.h"
COPTS
${ABSL_DEFAULT_COPTS}
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
exception_safety_testing
HDRS
"internal/exception_safety_testing.h"
SRCS
"internal/exception_safety_testing.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::config
absl::pretty_function
absl::memory
absl::meta
absl::strings
absl::utility
GTest::gtest
TESTONLY
)
absl_cc_test(
NAME
absl_exception_safety_testing_test
SRCS
"exception_safety_testing_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::exception_safety_testing
absl::memory
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
atomic_hook_test_helper
SRCS
"internal/atomic_hook_test_helper.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::atomic_hook
absl::core_headers
TESTONLY
)
absl_cc_test(
NAME
atomic_hook_test
SRCS
"internal/atomic_hook_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::atomic_hook_test_helper
absl::atomic_hook
absl::core_headers
GTest::gmock
GTest::gtest_main
)
absl_cc_test(
NAME
attributes_test
SRCS
"attributes_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::config
absl::core_headers
GTest::gtest_main
)
absl_cc_test(
NAME
bit_cast_test
SRCS
"bit_cast_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::core_headers
GTest::gtest_main
)
absl_cc_test(
NAME
errno_saver_test
SRCS
"internal/errno_saver_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::errno_saver
absl::strerror
GTest::gmock
GTest::gtest_main
)
absl_cc_test(
NAME
throw_delegate_test
SRCS
"throw_delegate_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::config
absl::throw_delegate
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
spinlock_test_common
SRCS
"spinlock_test_common.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::config
absl::base_internal
absl::core_headers
absl::synchronization
GTest::gtest
TESTONLY
)
# On bazel BUILD this target use "alwayslink = 1" which is not implemented here
absl_cc_test(
NAME
spinlock_test
SRCS
"spinlock_test_common.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::base_internal
absl::config
absl::core_headers
absl::synchronization
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
endian
HDRS
"internal/endian.h"
"internal/unaligned_access.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base
absl::config
absl::core_headers
absl::nullability
PUBLIC
)
absl_cc_test(
NAME
endian_test
SRCS
"internal/endian_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::config
absl::endian
GTest::gtest_main
)
absl_cc_test(
NAME
config_test
SRCS
"config_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::config
absl::synchronization
GTest::gtest_main
)
absl_cc_test(
NAME
call_once_test
SRCS
"call_once_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::core_headers
absl::synchronization
GTest::gtest_main
)
absl_cc_test(
NAME
no_destructor_test
SRCS
"no_destructor_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::no_destructor
absl::config
absl::raw_logging_internal
GTest::gmock
GTest::gtest_main
)
absl_cc_test(
NAME
raw_logging_test
SRCS
"raw_logging_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::raw_logging_internal
absl::strings
GTest::gtest_main
)
absl_cc_test(
NAME
sysinfo_test
SRCS
"internal/sysinfo_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::synchronization
GTest::gtest_main
)
absl_cc_test(
NAME
low_level_alloc_test
SRCS
"internal/low_level_alloc_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::malloc_internal
absl::node_hash_map
Threads::Threads
)
absl_cc_test(
NAME
thread_identity_test
SRCS
"internal/thread_identity_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::core_headers
absl::synchronization
Threads::Threads
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
scoped_set_env
SRCS
"internal/scoped_set_env.cc"
HDRS
"internal/scoped_set_env.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
absl::raw_logging_internal
)
absl_cc_test(
NAME
scoped_set_env_test
SRCS
"internal/scoped_set_env_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::scoped_set_env
GTest::gtest_main
)
absl_cc_test(
NAME
cmake_thread_test
SRCS
"internal/cmake_thread_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
)
absl_cc_test(
NAME
log_severity_test
SRCS
"log_severity_test.cc"
DEPS
absl::flags_internal
absl::flags_marshalling
absl::log_severity
absl::strings
GTest::gmock
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
strerror
SRCS
"internal/strerror.cc"
HDRS
"internal/strerror.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::config
absl::core_headers
absl::errno_saver
)
absl_cc_test(
NAME
strerror_test
SRCS
"internal/strerror_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::strerror
absl::strings
GTest::gmock
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
fast_type_id
HDRS
"internal/fast_type_id.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::config
)
absl_cc_test(
NAME
fast_type_id_test
SRCS
"internal/fast_type_id_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::fast_type_id
GTest::gtest_main
)
absl_cc_library(
NAME
prefetch
HDRS
"prefetch.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::config
absl::core_headers
)
absl_cc_test(
NAME
prefetch_test
SRCS
"prefetch_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::prefetch
GTest::gtest_main
)
absl_cc_test(
NAME
optimization_test
SRCS
"optimization_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::core_headers
absl::optional
GTest::gtest_main
)
absl_cc_library(
NAME
poison
SRCS
"internal/poison.cc"
HDRS
"internal/poison.h"
COPTS
${ABSL_DEFAULT_COPTS}
LINKOPTS
${ABSL_DEFAULT_LINKOPTS}
DEPS
absl::config
absl::core_headers
absl::malloc_internal
)
absl_cc_test(
NAME
poison_test
SRCS
"internal/poison_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::config
absl::poison
GTest::gtest_main
)
absl_cc_library(
NAME
tracing_internal
HDRS
"internal/tracing.h"
SRCS
"internal/tracing.cc"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base
)
absl_cc_test(
NAME
tracing_internal_weak_test
SRCS
"internal/tracing_weak_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::tracing_internal
GTest::gtest_main
)
absl_cc_test(
NAME
tracing_internal_strong_test
SRCS
"internal/tracing_strong_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::base
absl::tracing_internal
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
iterator_traits_internal
HDRS
"internal/iterator_traits.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
absl::type_traits
PUBLIC
)
absl_cc_test(
NAME
iterator_traits_test
SRCS
"internal/iterator_traits_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::config
absl::iterator_traits_internal
absl::iterator_traits_test_helper_internal
GTest::gtest_main
)
# Internal-only target, do not depend on directly.
absl_cc_library(
NAME
iterator_traits_test_helper_internal
HDRS
"internal/iterator_traits_test_helper.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
PUBLIC
)

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// Copyright 2025 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/attributes.h"
#include "gtest/gtest.h"
#include "absl/base/config.h"
namespace {
TEST(Attributes, RequireExplicitInit) {
struct Agg {
int f1;
int f2 ABSL_REQUIRE_EXPLICIT_INIT;
};
Agg good1 ABSL_ATTRIBUTE_UNUSED = {1, 2};
#if ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
Agg good2 ABSL_ATTRIBUTE_UNUSED(1, 2);
#endif
Agg good3 ABSL_ATTRIBUTE_UNUSED{1, 2};
Agg good4 ABSL_ATTRIBUTE_UNUSED = {1, 2};
Agg good5 ABSL_ATTRIBUTE_UNUSED = Agg{1, 2};
Agg good6[1] ABSL_ATTRIBUTE_UNUSED = {{1, 2}};
Agg good7[1] ABSL_ATTRIBUTE_UNUSED = {Agg{1, 2}};
union {
Agg agg;
} good8 ABSL_ATTRIBUTE_UNUSED = {{1, 2}};
constexpr Agg good9 ABSL_ATTRIBUTE_UNUSED = {1, 2};
constexpr Agg good10 ABSL_ATTRIBUTE_UNUSED{1, 2};
}
} // namespace

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Unit test for bit_cast template.
#include <cstdint>
#include <cstring>
#include "gtest/gtest.h"
#include "absl/base/casts.h"
#include "absl/base/macros.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
template <int N>
struct marshall { char buf[N]; };
template <typename T>
void TestMarshall(const T values[], int num_values) {
for (int i = 0; i < num_values; ++i) {
T t0 = values[i];
marshall<sizeof(T)> m0 = absl::bit_cast<marshall<sizeof(T)> >(t0);
T t1 = absl::bit_cast<T>(m0);
marshall<sizeof(T)> m1 = absl::bit_cast<marshall<sizeof(T)> >(t1);
ASSERT_EQ(0, memcmp(&t0, &t1, sizeof(T)));
ASSERT_EQ(0, memcmp(&m0, &m1, sizeof(T)));
}
}
// Convert back and forth to an integral type. The C++ standard does
// not guarantee this will work, but we test that this works on all the
// platforms we support.
//
// Likewise, we below make assumptions about sizeof(float) and
// sizeof(double) which the standard does not guarantee, but which hold on the
// platforms we support.
template <typename T, typename I>
void TestIntegral(const T values[], int num_values) {
for (int i = 0; i < num_values; ++i) {
T t0 = values[i];
I i0 = absl::bit_cast<I>(t0);
T t1 = absl::bit_cast<T>(i0);
I i1 = absl::bit_cast<I>(t1);
ASSERT_EQ(0, memcmp(&t0, &t1, sizeof(T)));
ASSERT_EQ(i0, i1);
}
}
TEST(BitCast, Bool) {
static const bool bool_list[] = { false, true };
TestMarshall<bool>(bool_list, ABSL_ARRAYSIZE(bool_list));
}
TEST(BitCast, Int32) {
static const int32_t int_list[] =
{ 0, 1, 100, 2147483647, -1, -100, -2147483647, -2147483647-1 };
TestMarshall<int32_t>(int_list, ABSL_ARRAYSIZE(int_list));
}
TEST(BitCast, Int64) {
static const int64_t int64_list[] =
{ 0, 1, 1LL << 40, -1, -(1LL<<40) };
TestMarshall<int64_t>(int64_list, ABSL_ARRAYSIZE(int64_list));
}
TEST(BitCast, Uint64) {
static const uint64_t uint64_list[] =
{ 0, 1, 1LLU << 40, 1LLU << 63 };
TestMarshall<uint64_t>(uint64_list, ABSL_ARRAYSIZE(uint64_list));
}
TEST(BitCast, Float) {
static const float float_list[] =
{ 0.0f, 1.0f, -1.0f, 10.0f, -10.0f,
1e10f, 1e20f, 1e-10f, 1e-20f,
2.71828f, 3.14159f };
TestMarshall<float>(float_list, ABSL_ARRAYSIZE(float_list));
TestIntegral<float, int>(float_list, ABSL_ARRAYSIZE(float_list));
TestIntegral<float, unsigned>(float_list, ABSL_ARRAYSIZE(float_list));
}
TEST(BitCast, Double) {
static const double double_list[] =
{ 0.0, 1.0, -1.0, 10.0, -10.0,
1e10, 1e100, 1e-10, 1e-100,
2.718281828459045,
3.141592653589793238462643383279502884197169399375105820974944 };
TestMarshall<double>(double_list, ABSL_ARRAYSIZE(double_list));
TestIntegral<double, int64_t>(double_list, ABSL_ARRAYSIZE(double_list));
TestIntegral<double, uint64_t>(double_list, ABSL_ARRAYSIZE(double_list));
}
} // namespace
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2024 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifdef __cplusplus
#error This is a C compile test
#endif
// This test ensures that headers that are included in legacy C code are
// compatible with C. Abseil is a C++ library. We do not desire to expand C
// compatibility or keep C compatibility forever. This test only exists to
// ensure C compatibility until it is no longer required. Do not add new code
// that requires C compatibility.
#include "absl/base/attributes.h" // IWYU pragma: keep
#include "absl/base/config.h" // IWYU pragma: keep
#include "absl/base/optimization.h" // IWYU pragma: keep
#include "absl/base/policy_checks.h" // IWYU pragma: keep
#include "absl/base/port.h" // IWYU pragma: keep
int main() { return 0; }

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: call_once.h
// -----------------------------------------------------------------------------
//
// This header file provides an Abseil version of `std::call_once` for invoking
// a given function at most once, across all threads. This Abseil version is
// faster than the C++11 version and incorporates the C++17 argument-passing
// fix, so that (for example) non-const references may be passed to the invoked
// function.
#ifndef ABSL_BASE_CALL_ONCE_H_
#define ABSL_BASE_CALL_ONCE_H_
#include <algorithm>
#include <atomic>
#include <cstdint>
#include <type_traits>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/low_level_scheduling.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/internal/spinlock_wait.h"
#include "absl/base/macros.h"
#include "absl/base/nullability.h"
#include "absl/base/optimization.h"
#include "absl/base/port.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
class once_flag;
namespace base_internal {
absl::Nonnull<std::atomic<uint32_t>*> ControlWord(
absl::Nonnull<absl::once_flag*> flag);
} // namespace base_internal
// call_once()
//
// For all invocations using a given `once_flag`, invokes a given `fn` exactly
// once across all threads. The first call to `call_once()` with a particular
// `once_flag` argument (that does not throw an exception) will run the
// specified function with the provided `args`; other calls with the same
// `once_flag` argument will not run the function, but will wait
// for the provided function to finish running (if it is still running).
//
// This mechanism provides a safe, simple, and fast mechanism for one-time
// initialization in a multi-threaded process.
//
// Example:
//
// class MyInitClass {
// public:
// ...
// mutable absl::once_flag once_;
//
// MyInitClass* init() const {
// absl::call_once(once_, &MyInitClass::Init, this);
// return ptr_;
// }
//
template <typename Callable, typename... Args>
void call_once(absl::once_flag& flag, Callable&& fn, Args&&... args);
// once_flag
//
// Objects of this type are used to distinguish calls to `call_once()` and
// ensure the provided function is only invoked once across all threads. This
// type is not copyable or movable. However, it has a `constexpr`
// constructor, and is safe to use as a namespace-scoped global variable.
class once_flag {
public:
constexpr once_flag() : control_(0) {}
once_flag(const once_flag&) = delete;
once_flag& operator=(const once_flag&) = delete;
private:
friend absl::Nonnull<std::atomic<uint32_t>*> base_internal::ControlWord(
absl::Nonnull<once_flag*> flag);
std::atomic<uint32_t> control_;
};
//------------------------------------------------------------------------------
// End of public interfaces.
// Implementation details follow.
//------------------------------------------------------------------------------
namespace base_internal {
// Like call_once, but uses KERNEL_ONLY scheduling. Intended to be used to
// initialize entities used by the scheduler implementation.
template <typename Callable, typename... Args>
void LowLevelCallOnce(absl::Nonnull<absl::once_flag*> flag, Callable&& fn,
Args&&... args);
// Disables scheduling while on stack when scheduling mode is non-cooperative.
// No effect for cooperative scheduling modes.
class SchedulingHelper {
public:
explicit SchedulingHelper(base_internal::SchedulingMode mode) : mode_(mode) {
if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
guard_result_ = base_internal::SchedulingGuard::DisableRescheduling();
}
}
~SchedulingHelper() {
if (mode_ == base_internal::SCHEDULE_KERNEL_ONLY) {
base_internal::SchedulingGuard::EnableRescheduling(guard_result_);
}
}
private:
base_internal::SchedulingMode mode_;
bool guard_result_ = false;
};
// Bit patterns for call_once state machine values. Internal implementation
// detail, not for use by clients.
//
// The bit patterns are arbitrarily chosen from unlikely values, to aid in
// debugging. However, kOnceInit must be 0, so that a zero-initialized
// once_flag will be valid for immediate use.
enum {
kOnceInit = 0,
kOnceRunning = 0x65C2937B,
kOnceWaiter = 0x05A308D2,
// A very small constant is chosen for kOnceDone so that it fit in a single
// compare with immediate instruction for most common ISAs. This is verified
// for x86, POWER and ARM.
kOnceDone = 221, // Random Number
};
template <typename Callable, typename... Args>
void
CallOnceImpl(absl::Nonnull<std::atomic<uint32_t>*> control,
base_internal::SchedulingMode scheduling_mode, Callable&& fn,
Args&&... args) {
#ifndef NDEBUG
{
uint32_t old_control = control->load(std::memory_order_relaxed);
if (old_control != kOnceInit &&
old_control != kOnceRunning &&
old_control != kOnceWaiter &&
old_control != kOnceDone) {
ABSL_RAW_LOG(FATAL, "Unexpected value for control word: 0x%lx",
static_cast<unsigned long>(old_control)); // NOLINT
}
}
#endif // NDEBUG
static const base_internal::SpinLockWaitTransition trans[] = {
{kOnceInit, kOnceRunning, true},
{kOnceRunning, kOnceWaiter, false},
{kOnceDone, kOnceDone, true}};
// Must do this before potentially modifying control word's state.
base_internal::SchedulingHelper maybe_disable_scheduling(scheduling_mode);
// Short circuit the simplest case to avoid procedure call overhead.
// The base_internal::SpinLockWait() call returns either kOnceInit or
// kOnceDone. If it returns kOnceDone, it must have loaded the control word
// with std::memory_order_acquire and seen a value of kOnceDone.
uint32_t old_control = kOnceInit;
if (control->compare_exchange_strong(old_control, kOnceRunning,
std::memory_order_relaxed) ||
base_internal::SpinLockWait(control, ABSL_ARRAYSIZE(trans), trans,
scheduling_mode) == kOnceInit) {
std::invoke(std::forward<Callable>(fn), std::forward<Args>(args)...);
old_control =
control->exchange(base_internal::kOnceDone, std::memory_order_release);
if (old_control == base_internal::kOnceWaiter) {
base_internal::SpinLockWake(control, true);
}
} // else *control is already kOnceDone
}
inline absl::Nonnull<std::atomic<uint32_t>*> ControlWord(
absl::Nonnull<once_flag*> flag) {
return &flag->control_;
}
template <typename Callable, typename... Args>
void LowLevelCallOnce(absl::Nonnull<absl::once_flag*> flag, Callable&& fn,
Args&&... args) {
std::atomic<uint32_t>* once = base_internal::ControlWord(flag);
uint32_t s = once->load(std::memory_order_acquire);
if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
base_internal::CallOnceImpl(once, base_internal::SCHEDULE_KERNEL_ONLY,
std::forward<Callable>(fn),
std::forward<Args>(args)...);
}
}
} // namespace base_internal
template <typename Callable, typename... Args>
void
call_once(absl::once_flag& flag, Callable&& fn, Args&&... args) {
std::atomic<uint32_t>* once = base_internal::ControlWord(&flag);
uint32_t s = once->load(std::memory_order_acquire);
if (ABSL_PREDICT_FALSE(s != base_internal::kOnceDone)) {
base_internal::CallOnceImpl(
once, base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL,
std::forward<Callable>(fn), std::forward<Args>(args)...);
}
}
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_CALL_ONCE_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/call_once.h"
#include <thread>
#include <vector>
#include "gtest/gtest.h"
#include "absl/base/attributes.h"
#include "absl/base/const_init.h"
#include "absl/base/thread_annotations.h"
#include "absl/synchronization/mutex.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
absl::once_flag once;
ABSL_CONST_INIT Mutex counters_mu(absl::kConstInit);
int running_thread_count ABSL_GUARDED_BY(counters_mu) = 0;
int call_once_invoke_count ABSL_GUARDED_BY(counters_mu) = 0;
int call_once_finished_count ABSL_GUARDED_BY(counters_mu) = 0;
int call_once_return_count ABSL_GUARDED_BY(counters_mu) = 0;
bool done_blocking ABSL_GUARDED_BY(counters_mu) = false;
// Function to be called from absl::call_once. Waits for a notification.
void WaitAndIncrement() {
counters_mu.Lock();
++call_once_invoke_count;
counters_mu.Unlock();
counters_mu.LockWhen(Condition(&done_blocking));
++call_once_finished_count;
counters_mu.Unlock();
}
void ThreadBody() {
counters_mu.Lock();
++running_thread_count;
counters_mu.Unlock();
absl::call_once(once, WaitAndIncrement);
counters_mu.Lock();
++call_once_return_count;
counters_mu.Unlock();
}
// Returns true if all threads are set up for the test.
bool ThreadsAreSetup(void*) ABSL_EXCLUSIVE_LOCKS_REQUIRED(counters_mu) {
// All ten threads must be running, and WaitAndIncrement should be blocked.
return running_thread_count == 10 && call_once_invoke_count == 1;
}
TEST(CallOnceTest, ExecutionCount) {
std::vector<std::thread> threads;
// Start 10 threads all calling call_once on the same once_flag.
for (int i = 0; i < 10; ++i) {
threads.emplace_back(ThreadBody);
}
// Wait until all ten threads have started, and WaitAndIncrement has been
// invoked.
counters_mu.LockWhen(Condition(ThreadsAreSetup, nullptr));
// WaitAndIncrement should have been invoked by exactly one call_once()
// instance. That thread should be blocking on a notification, and all other
// call_once instances should be blocking as well.
EXPECT_EQ(call_once_invoke_count, 1);
EXPECT_EQ(call_once_finished_count, 0);
EXPECT_EQ(call_once_return_count, 0);
// Allow WaitAndIncrement to finish executing. Once it does, the other
// call_once waiters will be unblocked.
done_blocking = true;
counters_mu.Unlock();
for (std::thread& thread : threads) {
thread.join();
}
counters_mu.Lock();
EXPECT_EQ(call_once_invoke_count, 1);
EXPECT_EQ(call_once_finished_count, 1);
EXPECT_EQ(call_once_return_count, 10);
counters_mu.Unlock();
}
} // namespace
ABSL_NAMESPACE_END
} // namespace absl

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//
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: casts.h
// -----------------------------------------------------------------------------
//
// This header file defines casting templates to fit use cases not covered by
// the standard casts provided in the C++ standard. As with all cast operations,
// use these with caution and only if alternatives do not exist.
#ifndef ABSL_BASE_CASTS_H_
#define ABSL_BASE_CASTS_H_
#include <cstring>
#include <memory>
#include <type_traits>
#include <utility>
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
#include <bit> // For std::bit_cast.
#endif // defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
#include "absl/base/internal/identity.h"
#include "absl/base/macros.h"
#include "absl/meta/type_traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
// implicit_cast()
//
// Performs an implicit conversion between types following the language
// rules for implicit conversion; if an implicit conversion is otherwise
// allowed by the language in the given context, this function performs such an
// implicit conversion.
//
// Example:
//
// // If the context allows implicit conversion:
// From from;
// To to = from;
//
// // Such code can be replaced by:
// implicit_cast<To>(from);
//
// An `implicit_cast()` may also be used to annotate numeric type conversions
// that, although safe, may produce compiler warnings (such as `long` to `int`).
// Additionally, an `implicit_cast()` is also useful within return statements to
// indicate a specific implicit conversion is being undertaken.
//
// Example:
//
// return implicit_cast<double>(size_in_bytes) / capacity_;
//
// Annotating code with `implicit_cast()` allows you to explicitly select
// particular overloads and template instantiations, while providing a safer
// cast than `reinterpret_cast()` or `static_cast()`.
//
// Additionally, an `implicit_cast()` can be used to allow upcasting within a
// type hierarchy where incorrect use of `static_cast()` could accidentally
// allow downcasting.
//
// Finally, an `implicit_cast()` can be used to perform implicit conversions
// from unrelated types that otherwise couldn't be implicitly cast directly;
// C++ will normally only implicitly cast "one step" in such conversions.
//
// That is, if C is a type which can be implicitly converted to B, with B being
// a type that can be implicitly converted to A, an `implicit_cast()` can be
// used to convert C to B (which the compiler can then implicitly convert to A
// using language rules).
//
// Example:
//
// // Assume an object C is convertible to B, which is implicitly convertible
// // to A
// A a = implicit_cast<B>(C);
//
// Such implicit cast chaining may be useful within template logic.
template <typename To>
constexpr To implicit_cast(typename absl::internal::type_identity_t<To> to) {
return to;
}
// bit_cast()
//
// Creates a value of the new type `Dest` whose representation is the same as
// that of the argument, which is of (deduced) type `Source` (a "bitwise cast";
// every bit in the value representation of the result is equal to the
// corresponding bit in the object representation of the source). Source and
// destination types must be of the same size, and both types must be trivially
// copyable.
//
// As with most casts, use with caution. A `bit_cast()` might be needed when you
// need to treat a value as the value of some other type, for example, to access
// the individual bits of an object which are not normally accessible through
// the object's type, such as for working with the binary representation of a
// floating point value:
//
// float f = 3.14159265358979;
// int i = bit_cast<int>(f);
// // i = 0x40490fdb
//
// Reinterpreting and accessing a value directly as a different type (as shown
// below) usually results in undefined behavior.
//
// Example:
//
// // WRONG
// float f = 3.14159265358979;
// int i = reinterpret_cast<int&>(f); // Wrong
// int j = *reinterpret_cast<int*>(&f); // Equally wrong
// int k = *bit_cast<int*>(&f); // Equally wrong
//
// Reinterpret-casting results in undefined behavior according to the ISO C++
// specification, section [basic.lval]. Roughly, this section says: if an object
// in memory has one type, and a program accesses it with a different type, the
// result is undefined behavior for most "different type".
//
// Using bit_cast on a pointer and then dereferencing it is no better than using
// reinterpret_cast. You should only use bit_cast on the value itself.
//
// Such casting results in type punning: holding an object in memory of one type
// and reading its bits back using a different type. A `bit_cast()` avoids this
// issue by copying the object representation to a new value, which avoids
// introducing this undefined behavior (since the original value is never
// accessed in the wrong way).
//
// The requirements of `absl::bit_cast` are more strict than that of
// `std::bit_cast` unless compiler support is available. Specifically, without
// compiler support, this implementation also requires `Dest` to be
// default-constructible. In C++20, `absl::bit_cast` is replaced by
// `std::bit_cast`.
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
using std::bit_cast;
#else // defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
template <
typename Dest, typename Source,
typename std::enable_if<sizeof(Dest) == sizeof(Source) &&
std::is_trivially_copyable<Source>::value &&
std::is_trivially_copyable<Dest>::value
#if !ABSL_HAVE_BUILTIN(__builtin_bit_cast)
&& std::is_default_constructible<Dest>::value
#endif // !ABSL_HAVE_BUILTIN(__builtin_bit_cast)
,
int>::type = 0>
#if ABSL_HAVE_BUILTIN(__builtin_bit_cast)
inline constexpr Dest bit_cast(const Source& source) {
return __builtin_bit_cast(Dest, source);
}
#else // ABSL_HAVE_BUILTIN(__builtin_bit_cast)
inline Dest bit_cast(const Source& source) {
Dest dest;
memcpy(static_cast<void*>(std::addressof(dest)),
static_cast<const void*>(std::addressof(source)), sizeof(dest));
return dest;
}
#endif // ABSL_HAVE_BUILTIN(__builtin_bit_cast)
#endif // defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_CASTS_H_

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//
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: config.h
// -----------------------------------------------------------------------------
//
// This header file defines a set of macros for checking the presence of
// important compiler and platform features. Such macros can be used to
// produce portable code by parameterizing compilation based on the presence or
// lack of a given feature.
//
// We define a "feature" as some interface we wish to program to: for example,
// a library function or system call. A value of `1` indicates support for
// that feature; any other value indicates the feature support is undefined.
//
// Example:
//
// Suppose a programmer wants to write a program that uses the 'mmap()' system
// call. The Abseil macro for that feature (`ABSL_HAVE_MMAP`) allows you to
// selectively include the `mmap.h` header and bracket code using that feature
// in the macro:
//
// #include "absl/base/config.h"
//
// #ifdef ABSL_HAVE_MMAP
// #include "sys/mman.h"
// #endif //ABSL_HAVE_MMAP
//
// ...
// #ifdef ABSL_HAVE_MMAP
// void *ptr = mmap(...);
// ...
// #endif // ABSL_HAVE_MMAP
#ifndef ABSL_BASE_CONFIG_H_
#define ABSL_BASE_CONFIG_H_
// Included for the __GLIBC__ macro (or similar macros on other systems).
#include <limits.h>
#ifdef __cplusplus
// Included for __GLIBCXX__, _LIBCPP_VERSION
#include <cstddef>
#endif // __cplusplus
// ABSL_INTERNAL_CPLUSPLUS_LANG
//
// MSVC does not set the value of __cplusplus correctly, but instead uses
// _MSVC_LANG as a stand-in.
// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
//
// However, there are reports that MSVC even sets _MSVC_LANG incorrectly at
// times, for example:
// https://github.com/microsoft/vscode-cpptools/issues/1770
// https://reviews.llvm.org/D70996
//
// For this reason, this symbol is considered INTERNAL and code outside of
// Abseil must not use it.
#if defined(_MSVC_LANG)
#define ABSL_INTERNAL_CPLUSPLUS_LANG _MSVC_LANG
#elif defined(__cplusplus)
#define ABSL_INTERNAL_CPLUSPLUS_LANG __cplusplus
#endif
#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
// Include library feature test macros.
#include <version>
#endif
#if defined(__APPLE__)
// Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED,
// __IPHONE_8_0.
#include <Availability.h>
#include <TargetConditionals.h>
#endif
#include "absl/base/options.h"
#include "absl/base/policy_checks.h"
// Abseil long-term support (LTS) releases will define
// `ABSL_LTS_RELEASE_VERSION` to the integer representing the date string of the
// LTS release version, and will define `ABSL_LTS_RELEASE_PATCH_LEVEL` to the
// integer representing the patch-level for that release.
//
// For example, for LTS release version "20300401.2", this would give us
// ABSL_LTS_RELEASE_VERSION == 20300401 && ABSL_LTS_RELEASE_PATCH_LEVEL == 2
//
// These symbols will not be defined in non-LTS code.
//
// Abseil recommends that clients live-at-head. Therefore, if you are using
// these symbols to assert a minimum version requirement, we recommend you do it
// as
//
// #if defined(ABSL_LTS_RELEASE_VERSION) && ABSL_LTS_RELEASE_VERSION < 20300401
// #error Project foo requires Abseil LTS version >= 20300401
// #endif
//
// The `defined(ABSL_LTS_RELEASE_VERSION)` part of the check excludes
// live-at-head clients from the minimum version assertion.
//
// See https://abseil.io/about/releases for more information on Abseil release
// management.
//
// LTS releases can be obtained from
// https://github.com/abseil/abseil-cpp/releases.
#undef ABSL_LTS_RELEASE_VERSION
#undef ABSL_LTS_RELEASE_PATCH_LEVEL
// Helper macro to convert a CPP variable to a string literal.
#define ABSL_INTERNAL_DO_TOKEN_STR(x) #x
#define ABSL_INTERNAL_TOKEN_STR(x) ABSL_INTERNAL_DO_TOKEN_STR(x)
// -----------------------------------------------------------------------------
// Abseil namespace annotations
// -----------------------------------------------------------------------------
// ABSL_NAMESPACE_BEGIN/ABSL_NAMESPACE_END
//
// An annotation placed at the beginning/end of each `namespace absl` scope.
// This is used to inject an inline namespace.
//
// The proper way to write Abseil code in the `absl` namespace is:
//
// namespace absl {
// ABSL_NAMESPACE_BEGIN
//
// void Foo(); // absl::Foo().
//
// ABSL_NAMESPACE_END
// } // namespace absl
//
// Users of Abseil should not use these macros, because users of Abseil should
// not write `namespace absl {` in their own code for any reason. (Abseil does
// not support forward declarations of its own types, nor does it support
// user-provided specialization of Abseil templates. Code that violates these
// rules may be broken without warning.)
#if !defined(ABSL_OPTION_USE_INLINE_NAMESPACE) || \
!defined(ABSL_OPTION_INLINE_NAMESPACE_NAME)
#error options.h is misconfigured.
#endif
// Check that ABSL_OPTION_INLINE_NAMESPACE_NAME is neither "head" nor ""
#if defined(__cplusplus) && ABSL_OPTION_USE_INLINE_NAMESPACE == 1
#define ABSL_INTERNAL_INLINE_NAMESPACE_STR \
ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME)
static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != '\0',
"options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must "
"not be empty.");
static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
ABSL_INTERNAL_INLINE_NAMESPACE_STR[1] != 'e' ||
ABSL_INTERNAL_INLINE_NAMESPACE_STR[2] != 'a' ||
ABSL_INTERNAL_INLINE_NAMESPACE_STR[3] != 'd' ||
ABSL_INTERNAL_INLINE_NAMESPACE_STR[4] != '\0',
"options.h misconfigured: ABSL_OPTION_INLINE_NAMESPACE_NAME must "
"be changed to a new, unique identifier name.");
#endif
#if ABSL_OPTION_USE_INLINE_NAMESPACE == 0
#define ABSL_NAMESPACE_BEGIN
#define ABSL_NAMESPACE_END
#define ABSL_INTERNAL_C_SYMBOL(x) x
#elif ABSL_OPTION_USE_INLINE_NAMESPACE == 1
#define ABSL_NAMESPACE_BEGIN \
inline namespace ABSL_OPTION_INLINE_NAMESPACE_NAME {
#define ABSL_NAMESPACE_END }
#define ABSL_INTERNAL_C_SYMBOL_HELPER_2(x, v) x##_##v
#define ABSL_INTERNAL_C_SYMBOL_HELPER_1(x, v) \
ABSL_INTERNAL_C_SYMBOL_HELPER_2(x, v)
#define ABSL_INTERNAL_C_SYMBOL(x) \
ABSL_INTERNAL_C_SYMBOL_HELPER_1(x, ABSL_OPTION_INLINE_NAMESPACE_NAME)
#else
#error options.h is misconfigured.
#endif
// -----------------------------------------------------------------------------
// Compiler Feature Checks
// -----------------------------------------------------------------------------
// ABSL_HAVE_BUILTIN()
//
// Checks whether the compiler supports a Clang Feature Checking Macro, and if
// so, checks whether it supports the provided builtin function "x" where x
// is one of the functions noted in
// https://clang.llvm.org/docs/LanguageExtensions.html
//
// Note: Use this macro to avoid an extra level of #ifdef __has_builtin check.
// http://releases.llvm.org/3.3/tools/clang/docs/LanguageExtensions.html
#ifdef __has_builtin
#define ABSL_HAVE_BUILTIN(x) __has_builtin(x)
#else
#define ABSL_HAVE_BUILTIN(x) 0
#endif
#ifdef __has_feature
#define ABSL_HAVE_FEATURE(f) __has_feature(f)
#else
#define ABSL_HAVE_FEATURE(f) 0
#endif
// Portable check for GCC minimum version:
// https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
#define ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(x, y) \
(__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y))
#else
#define ABSL_INTERNAL_HAVE_MIN_GNUC_VERSION(x, y) 0
#endif
#if defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__)
#define ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(x, y) \
(__clang_major__ > (x) || __clang_major__ == (x) && __clang_minor__ >= (y))
#else
#define ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(x, y) 0
#endif
// ABSL_HAVE_TLS is defined to 1 when __thread should be supported.
// We assume __thread is supported on Linux when compiled with Clang or
// compiled against libstdc++ with _GLIBCXX_HAVE_TLS defined.
#ifdef ABSL_HAVE_TLS
#error ABSL_HAVE_TLS cannot be directly set
#elif (defined(__linux__)) && (defined(__clang__) || defined(_GLIBCXX_HAVE_TLS))
#define ABSL_HAVE_TLS 1
#endif
// ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
//
// Checks whether `std::is_trivially_destructible<T>` is supported.
#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
#error ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
#define ABSL_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
#endif
// ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
//
// Checks whether `std::is_trivially_default_constructible<T>` and
// `std::is_trivially_copy_constructible<T>` are supported.
#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE
#error ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
#else
#define ABSL_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
#endif
// ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
//
// Checks whether `std::is_trivially_copy_assignable<T>` is supported.
#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE
#error ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot be directly set
#else
#define ABSL_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
#endif
// ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
//
// Checks whether `std::is_trivially_copyable<T>` is supported.
#ifdef ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE
#error ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE cannot be directly set
#define ABSL_HAVE_STD_IS_TRIVIALLY_COPYABLE 1
#endif
// ABSL_HAVE_THREAD_LOCAL
//
// Checks whether the `thread_local` storage duration specifier is supported.
#ifdef ABSL_HAVE_THREAD_LOCAL
#error ABSL_HAVE_THREAD_LOCAL cannot be directly set
#elif !defined(__XTENSA__)
#define ABSL_HAVE_THREAD_LOCAL 1
#endif
// ABSL_HAVE_INTRINSIC_INT128
//
// Checks whether the __int128 compiler extension for a 128-bit integral type is
// supported.
//
// Note: __SIZEOF_INT128__ is defined by Clang and GCC when __int128 is
// supported, but we avoid using it in certain cases:
// * On Clang:
// * Building using Clang for Windows, where the Clang runtime library has
// 128-bit support only on LP64 architectures, but Windows is LLP64.
// * On Nvidia's nvcc:
// * nvcc also defines __GNUC__ and __SIZEOF_INT128__, but not all versions
// actually support __int128.
#ifdef ABSL_HAVE_INTRINSIC_INT128
#error ABSL_HAVE_INTRINSIC_INT128 cannot be directly set
#elif defined(__SIZEOF_INT128__)
#if (defined(__clang__) && !defined(_WIN32)) || \
(defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) || \
(defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__))
#define ABSL_HAVE_INTRINSIC_INT128 1
#elif defined(__CUDACC__)
// __CUDACC_VER__ is a full version number before CUDA 9, and is defined to a
// string explaining that it has been removed starting with CUDA 9. We use
// nested #ifs because there is no short-circuiting in the preprocessor.
// NOTE: `__CUDACC__` could be undefined while `__CUDACC_VER__` is defined.
#if __CUDACC_VER__ >= 70000
#define ABSL_HAVE_INTRINSIC_INT128 1
#endif // __CUDACC_VER__ >= 70000
#endif // defined(__CUDACC__)
#endif // ABSL_HAVE_INTRINSIC_INT128
// ABSL_HAVE_EXCEPTIONS
//
// Checks whether the compiler both supports and enables exceptions. Many
// compilers support a "no exceptions" mode that disables exceptions.
//
// Generally, when ABSL_HAVE_EXCEPTIONS is not defined:
//
// * Code using `throw` and `try` may not compile.
// * The `noexcept` specifier will still compile and behave as normal.
// * The `noexcept` operator may still return `false`.
//
// For further details, consult the compiler's documentation.
#ifdef ABSL_HAVE_EXCEPTIONS
#error ABSL_HAVE_EXCEPTIONS cannot be directly set.
#elif ABSL_INTERNAL_HAVE_MIN_CLANG_VERSION(3, 6)
// Clang >= 3.6
#if ABSL_HAVE_FEATURE(cxx_exceptions)
#define ABSL_HAVE_EXCEPTIONS 1
#endif // ABSL_HAVE_FEATURE(cxx_exceptions)
#elif defined(__clang__)
// Clang < 3.6
// http://releases.llvm.org/3.6.0/tools/clang/docs/ReleaseNotes.html#the-exceptions-macro
#if defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
#define ABSL_HAVE_EXCEPTIONS 1
#endif // defined(__EXCEPTIONS) && ABSL_HAVE_FEATURE(cxx_exceptions)
// Handle remaining special cases and default to exceptions being supported.
#elif !(defined(__GNUC__) && !defined(__cpp_exceptions)) && \
!(defined(_MSC_VER) && !defined(_CPPUNWIND))
#define ABSL_HAVE_EXCEPTIONS 1
#endif
// -----------------------------------------------------------------------------
// Platform Feature Checks
// -----------------------------------------------------------------------------
// Currently supported operating systems and associated preprocessor
// symbols:
//
// Linux and Linux-derived __linux__
// Android __ANDROID__ (implies __linux__)
// Linux (non-Android) __linux__ && !__ANDROID__
// Darwin (macOS and iOS) __APPLE__
// Akaros (http://akaros.org) __ros__
// Windows _WIN32
// NaCL __native_client__
// AsmJS __asmjs__
// WebAssembly (Emscripten) __EMSCRIPTEN__
// Fuchsia __Fuchsia__
//
// Note that since Android defines both __ANDROID__ and __linux__, one
// may probe for either Linux or Android by simply testing for __linux__.
// ABSL_HAVE_MMAP
//
// Checks whether the platform has an mmap(2) implementation as defined in
// POSIX.1-2001.
#ifdef ABSL_HAVE_MMAP
#error ABSL_HAVE_MMAP cannot be directly set
#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
defined(_AIX) || defined(__ros__) || defined(__native_client__) || \
defined(__asmjs__) || defined(__EMSCRIPTEN__) || defined(__Fuchsia__) || \
defined(__sun) || defined(__myriad2__) || defined(__HAIKU__) || \
defined(__OpenBSD__) || defined(__NetBSD__) || defined(__QNX__) || \
defined(__VXWORKS__) || defined(__hexagon__) || defined(__XTENSA__)
#define ABSL_HAVE_MMAP 1
#endif
// ABSL_HAVE_PTHREAD_GETSCHEDPARAM
//
// Checks whether the platform implements the pthread_(get|set)schedparam(3)
// functions as defined in POSIX.1-2001.
#ifdef ABSL_HAVE_PTHREAD_GETSCHEDPARAM
#error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) || \
defined(__NetBSD__) || defined(__VXWORKS__)
#define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
#endif
// ABSL_HAVE_SCHED_GETCPU
//
// Checks whether sched_getcpu is available.
#ifdef ABSL_HAVE_SCHED_GETCPU
#error ABSL_HAVE_SCHED_GETCPU cannot be directly set
#elif defined(__linux__)
#define ABSL_HAVE_SCHED_GETCPU 1
#endif
// ABSL_HAVE_SCHED_YIELD
//
// Checks whether the platform implements sched_yield(2) as defined in
// POSIX.1-2001.
#ifdef ABSL_HAVE_SCHED_YIELD
#error ABSL_HAVE_SCHED_YIELD cannot be directly set
#elif defined(__linux__) || defined(__ros__) || defined(__native_client__) || \
defined(__VXWORKS__)
#define ABSL_HAVE_SCHED_YIELD 1
#endif
// ABSL_HAVE_SEMAPHORE_H
//
// Checks whether the platform supports the <semaphore.h> header and sem_init(3)
// family of functions as standardized in POSIX.1-2001.
//
// Note: While Apple provides <semaphore.h> for both iOS and macOS, it is
// explicitly deprecated and will cause build failures if enabled for those
// platforms. We side-step the issue by not defining it here for Apple
// platforms.
#ifdef ABSL_HAVE_SEMAPHORE_H
#error ABSL_HAVE_SEMAPHORE_H cannot be directly set
#elif defined(__linux__) || defined(__ros__) || defined(__VXWORKS__)
#define ABSL_HAVE_SEMAPHORE_H 1
#endif
// ABSL_HAVE_ALARM
//
// Checks whether the platform supports the <signal.h> header and alarm(2)
// function as standardized in POSIX.1-2001.
#ifdef ABSL_HAVE_ALARM
#error ABSL_HAVE_ALARM cannot be directly set
#elif defined(__GOOGLE_GRTE_VERSION__)
// feature tests for Google's GRTE
#define ABSL_HAVE_ALARM 1
#elif defined(__GLIBC__)
// feature test for glibc
#define ABSL_HAVE_ALARM 1
#elif defined(_MSC_VER)
// feature tests for Microsoft's library
#elif defined(__MINGW32__)
// mingw32 doesn't provide alarm(2):
// https://osdn.net/projects/mingw/scm/git/mingw-org-wsl/blobs/5.2-trunk/mingwrt/include/unistd.h
// mingw-w64 provides a no-op implementation:
// https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/alarm.c
#elif defined(__EMSCRIPTEN__)
// emscripten doesn't support signals
#elif defined(__wasi__)
// WASI doesn't support signals
#elif defined(__Fuchsia__)
// Signals don't exist on fuchsia.
#elif defined(__native_client__)
// Signals don't exist on hexagon/QuRT
#elif defined(__hexagon__)
#else
// other standard libraries
#define ABSL_HAVE_ALARM 1
#endif
// ABSL_IS_LITTLE_ENDIAN
// ABSL_IS_BIG_ENDIAN
//
// Checks the endianness of the platform.
//
// Prefer using `std::endian` in C++20, or `absl::endian` from
// absl/numeric/bits.h prior to C++20.
//
// Notes: uses the built in endian macros provided by GCC (since 4.6) and
// Clang (since 3.2); see
// https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html.
// Otherwise, if _WIN32, assume little endian. Otherwise, bail with an error.
#if defined(ABSL_IS_BIG_ENDIAN)
#error "ABSL_IS_BIG_ENDIAN cannot be directly set."
#endif
#if defined(ABSL_IS_LITTLE_ENDIAN)
#error "ABSL_IS_LITTLE_ENDIAN cannot be directly set."
#endif
#if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
#define ABSL_IS_LITTLE_ENDIAN 1
#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define ABSL_IS_BIG_ENDIAN 1
#elif defined(_WIN32)
#define ABSL_IS_LITTLE_ENDIAN 1
#else
#error "absl endian detection needs to be set up for your compiler"
#endif
// macOS < 10.13 and iOS < 12 don't support <any>, <optional>, or <variant>
// because the libc++ shared library shipped on the system doesn't have the
// requisite exported symbols. See
// https://github.com/abseil/abseil-cpp/issues/207 and
// https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes
//
// libc++ spells out the availability requirements in the file
// llvm-project/libcxx/include/__config via the #define
// _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS. The set of versions has been
// modified a few times, via
// https://github.com/llvm/llvm-project/commit/7fb40e1569dd66292b647f4501b85517e9247953
// and
// https://github.com/llvm/llvm-project/commit/0bc451e7e137c4ccadcd3377250874f641ca514a
// The second has the actually correct versions, thus, is what we copy here.
#if defined(__APPLE__) && \
((defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) && \
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101300) || \
(defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && \
__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 120000) || \
(defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__) && \
__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 50000) || \
(defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__) && \
__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 120000))
#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 1
#else
#define ABSL_INTERNAL_APPLE_CXX17_TYPES_UNAVAILABLE 0
#endif
// Deprecated macros for polyfill detection.
#define ABSL_HAVE_STD_ANY 1
#define ABSL_USES_STD_ANY 1
#define ABSL_HAVE_STD_OPTIONAL 1
#define ABSL_USES_STD_OPTIONAL 1
#define ABSL_HAVE_STD_VARIANT 1
#define ABSL_USES_STD_VARIANT 1
// ABSL_HAVE_STD_STRING_VIEW
//
// Checks whether C++17 std::string_view is available.
#ifdef ABSL_HAVE_STD_STRING_VIEW
#error "ABSL_HAVE_STD_STRING_VIEW cannot be directly set."
#elif defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L
#define ABSL_HAVE_STD_STRING_VIEW 1
#elif defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
#define ABSL_HAVE_STD_STRING_VIEW 1
#endif
// ABSL_HAVE_STD_ORDERING
//
// Checks whether C++20 std::{partial,weak,strong}_ordering are available.
//
// __cpp_lib_three_way_comparison is missing on libc++
// (https://github.com/llvm/llvm-project/issues/73953) so treat it as defined
// when building in C++20 mode.
#ifdef ABSL_HAVE_STD_ORDERING
#error "ABSL_HAVE_STD_ORDERING cannot be directly set."
#elif (defined(__cpp_lib_three_way_comparison) && \
__cpp_lib_three_way_comparison >= 201907L) || \
(defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L)
#define ABSL_HAVE_STD_ORDERING 1
#endif
// ABSL_USES_STD_STRING_VIEW
//
// Indicates whether absl::string_view is an alias for std::string_view.
#if !defined(ABSL_OPTION_USE_STD_STRING_VIEW)
#error options.h is misconfigured.
#elif ABSL_OPTION_USE_STD_STRING_VIEW == 0 || \
(ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
!defined(ABSL_HAVE_STD_STRING_VIEW))
#undef ABSL_USES_STD_STRING_VIEW
#elif ABSL_OPTION_USE_STD_STRING_VIEW == 1 || \
(ABSL_OPTION_USE_STD_STRING_VIEW == 2 && \
defined(ABSL_HAVE_STD_STRING_VIEW))
#define ABSL_USES_STD_STRING_VIEW 1
#else
#error options.h is misconfigured.
#endif
// ABSL_USES_STD_ORDERING
//
// Indicates whether absl::{partial,weak,strong}_ordering are aliases for the
// std:: ordering types.
#if !defined(ABSL_OPTION_USE_STD_ORDERING)
#error options.h is misconfigured.
#elif ABSL_OPTION_USE_STD_ORDERING == 0 || \
(ABSL_OPTION_USE_STD_ORDERING == 2 && !defined(ABSL_HAVE_STD_ORDERING))
#undef ABSL_USES_STD_ORDERING
#elif ABSL_OPTION_USE_STD_ORDERING == 1 || \
(ABSL_OPTION_USE_STD_ORDERING == 2 && defined(ABSL_HAVE_STD_ORDERING))
#define ABSL_USES_STD_ORDERING 1
#else
#error options.h is misconfigured.
#endif
// ABSL_INTERNAL_MANGLED_NS
// ABSL_INTERNAL_MANGLED_BACKREFERENCE
//
// Internal macros for building up mangled names in our internal fork of CCTZ.
// This implementation detail is only needed and provided for the MSVC build.
//
// These macros both expand to string literals. ABSL_INTERNAL_MANGLED_NS is
// the mangled spelling of the `absl` namespace, and
// ABSL_INTERNAL_MANGLED_BACKREFERENCE is a back-reference integer representing
// the proper count to skip past the CCTZ fork namespace names. (This number
// is one larger when there is an inline namespace name to skip.)
#if defined(_MSC_VER)
#if ABSL_OPTION_USE_INLINE_NAMESPACE == 0
#define ABSL_INTERNAL_MANGLED_NS "absl"
#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "5"
#else
#define ABSL_INTERNAL_MANGLED_NS \
ABSL_INTERNAL_TOKEN_STR(ABSL_OPTION_INLINE_NAMESPACE_NAME) "@absl"
#define ABSL_INTERNAL_MANGLED_BACKREFERENCE "6"
#endif
#endif
// ABSL_DLL
//
// When building Abseil as a DLL, this macro expands to `__declspec(dllexport)`
// so we can annotate symbols appropriately as being exported. When used in
// headers consuming a DLL, this macro expands to `__declspec(dllimport)` so
// that consumers know the symbol is defined inside the DLL. In all other cases,
// the macro expands to nothing.
#if defined(_MSC_VER)
#if defined(ABSL_BUILD_DLL)
#define ABSL_DLL __declspec(dllexport)
#elif defined(ABSL_CONSUME_DLL)
#define ABSL_DLL __declspec(dllimport)
#else
#define ABSL_DLL
#endif
#else
#define ABSL_DLL
#endif // defined(_MSC_VER)
#if defined(_MSC_VER)
#if defined(ABSL_BUILD_TEST_DLL)
#define ABSL_TEST_DLL __declspec(dllexport)
#elif defined(ABSL_CONSUME_TEST_DLL)
#define ABSL_TEST_DLL __declspec(dllimport)
#else
#define ABSL_TEST_DLL
#endif
#else
#define ABSL_TEST_DLL
#endif // defined(_MSC_VER)
// ABSL_HAVE_MEMORY_SANITIZER
//
// MemorySanitizer (MSan) is a detector of uninitialized reads. It consists of
// a compiler instrumentation module and a run-time library.
#ifdef ABSL_HAVE_MEMORY_SANITIZER
#error "ABSL_HAVE_MEMORY_SANITIZER cannot be directly set."
#elif !defined(__native_client__) && ABSL_HAVE_FEATURE(memory_sanitizer)
#define ABSL_HAVE_MEMORY_SANITIZER 1
#endif
// ABSL_HAVE_THREAD_SANITIZER
//
// ThreadSanitizer (TSan) is a fast data race detector.
#ifdef ABSL_HAVE_THREAD_SANITIZER
#error "ABSL_HAVE_THREAD_SANITIZER cannot be directly set."
#elif defined(__SANITIZE_THREAD__)
#define ABSL_HAVE_THREAD_SANITIZER 1
#elif ABSL_HAVE_FEATURE(thread_sanitizer)
#define ABSL_HAVE_THREAD_SANITIZER 1
#endif
// ABSL_HAVE_ADDRESS_SANITIZER
//
// AddressSanitizer (ASan) is a fast memory error detector.
#ifdef ABSL_HAVE_ADDRESS_SANITIZER
#error "ABSL_HAVE_ADDRESS_SANITIZER cannot be directly set."
#elif defined(__SANITIZE_ADDRESS__)
#define ABSL_HAVE_ADDRESS_SANITIZER 1
#elif ABSL_HAVE_FEATURE(address_sanitizer)
#define ABSL_HAVE_ADDRESS_SANITIZER 1
#endif
// ABSL_HAVE_HWADDRESS_SANITIZER
//
// Hardware-Assisted AddressSanitizer (or HWASAN) is even faster than asan
// memory error detector which can use CPU features like ARM TBI, Intel LAM or
// AMD UAI.
#ifdef ABSL_HAVE_HWADDRESS_SANITIZER
#error "ABSL_HAVE_HWADDRESS_SANITIZER cannot be directly set."
#elif defined(__SANITIZE_HWADDRESS__)
#define ABSL_HAVE_HWADDRESS_SANITIZER 1
#elif ABSL_HAVE_FEATURE(hwaddress_sanitizer)
#define ABSL_HAVE_HWADDRESS_SANITIZER 1
#endif
// ABSL_HAVE_DATAFLOW_SANITIZER
//
// Dataflow Sanitizer (or DFSAN) is a generalised dynamic data flow analysis.
#ifdef ABSL_HAVE_DATAFLOW_SANITIZER
#error "ABSL_HAVE_DATAFLOW_SANITIZER cannot be directly set."
#elif defined(DATAFLOW_SANITIZER)
// GCC provides no method for detecting the presence of the standalone
// DataFlowSanitizer (-fsanitize=dataflow), so GCC users of -fsanitize=dataflow
// should also use -DDATAFLOW_SANITIZER.
#define ABSL_HAVE_DATAFLOW_SANITIZER 1
#elif ABSL_HAVE_FEATURE(dataflow_sanitizer)
#define ABSL_HAVE_DATAFLOW_SANITIZER 1
#endif
// ABSL_HAVE_LEAK_SANITIZER
//
// LeakSanitizer (or lsan) is a detector of memory leaks.
// https://clang.llvm.org/docs/LeakSanitizer.html
// https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer
//
// The macro ABSL_HAVE_LEAK_SANITIZER can be used to detect at compile-time
// whether the LeakSanitizer is potentially available. However, just because the
// LeakSanitizer is available does not mean it is active. Use the
// always-available run-time interface in //absl/debugging/leak_check.h for
// interacting with LeakSanitizer.
#ifdef ABSL_HAVE_LEAK_SANITIZER
#error "ABSL_HAVE_LEAK_SANITIZER cannot be directly set."
#elif defined(LEAK_SANITIZER)
// GCC provides no method for detecting the presence of the standalone
// LeakSanitizer (-fsanitize=leak), so GCC users of -fsanitize=leak should also
// use -DLEAK_SANITIZER.
#define ABSL_HAVE_LEAK_SANITIZER 1
// Clang standalone LeakSanitizer (-fsanitize=leak)
#elif ABSL_HAVE_FEATURE(leak_sanitizer)
#define ABSL_HAVE_LEAK_SANITIZER 1
#elif defined(ABSL_HAVE_ADDRESS_SANITIZER)
// GCC or Clang using the LeakSanitizer integrated into AddressSanitizer.
#define ABSL_HAVE_LEAK_SANITIZER 1
#endif
// ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
//
// Deprecated: always defined to 1.
// Class template argument deduction is a language feature added in C++17,
// which means all versions of C++ supported by Abseil have it.
#ifdef ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION
#error "ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION cannot be directly set."
#else
#define ABSL_HAVE_CLASS_TEMPLATE_ARGUMENT_DEDUCTION 1
#endif
// `ABSL_INTERNAL_HAS_RTTI` determines whether abseil is being compiled with
// RTTI support.
#ifdef ABSL_INTERNAL_HAS_RTTI
#error ABSL_INTERNAL_HAS_RTTI cannot be directly set
#elif ABSL_HAVE_FEATURE(cxx_rtti)
#define ABSL_INTERNAL_HAS_RTTI 1
#elif defined(__GNUC__) && defined(__GXX_RTTI)
#define ABSL_INTERNAL_HAS_RTTI 1
#elif defined(_MSC_VER) && defined(_CPPRTTI)
#define ABSL_INTERNAL_HAS_RTTI 1
#elif !defined(__GNUC__) && !defined(_MSC_VER)
// Unknown compiler, default to RTTI
#define ABSL_INTERNAL_HAS_RTTI 1
#endif
// `ABSL_INTERNAL_HAS_CXA_DEMANGLE` determines whether `abi::__cxa_demangle` is
// available.
#ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE
#error ABSL_INTERNAL_HAS_CXA_DEMANGLE cannot be directly set
#elif defined(OS_ANDROID) && (defined(__i386__) || defined(__x86_64__))
#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 0
#elif defined(__GNUC__)
#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1
#elif defined(__clang__) && !defined(_MSC_VER)
#define ABSL_INTERNAL_HAS_CXA_DEMANGLE 1
#endif
// ABSL_INTERNAL_HAVE_SSE is used for compile-time detection of SSE support.
// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
// which architectures support the various x86 instruction sets.
#ifdef ABSL_INTERNAL_HAVE_SSE
#error ABSL_INTERNAL_HAVE_SSE cannot be directly set
#elif defined(__SSE__)
#define ABSL_INTERNAL_HAVE_SSE 1
#elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 1)) && \
!defined(_M_ARM64EC)
// MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 1
// indicates that at least SSE was targeted with the /arch:SSE option.
// All x86-64 processors support SSE, so support can be assumed.
// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
#define ABSL_INTERNAL_HAVE_SSE 1
#endif
// ABSL_INTERNAL_HAVE_SSE2 is used for compile-time detection of SSE2 support.
// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
// which architectures support the various x86 instruction sets.
#ifdef ABSL_INTERNAL_HAVE_SSE2
#error ABSL_INTERNAL_HAVE_SSE2 cannot be directly set
#elif defined(__SSE2__)
#define ABSL_INTERNAL_HAVE_SSE2 1
#elif (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2)) && \
!defined(_M_ARM64EC)
// MSVC only defines _M_IX86_FP for x86 32-bit code, and _M_IX86_FP >= 2
// indicates that at least SSE2 was targeted with the /arch:SSE2 option.
// All x86-64 processors support SSE2, so support can be assumed.
// https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros
#define ABSL_INTERNAL_HAVE_SSE2 1
#endif
// ABSL_INTERNAL_HAVE_SSSE3 is used for compile-time detection of SSSE3 support.
// See https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html for an overview of
// which architectures support the various x86 instruction sets.
//
// MSVC does not have a mode that targets SSSE3 at compile-time. To use SSSE3
// with MSVC requires either assuming that the code will only every run on CPUs
// that support SSSE3, otherwise __cpuid() can be used to detect support at
// runtime and fallback to a non-SSSE3 implementation when SSSE3 is unsupported
// by the CPU.
#ifdef ABSL_INTERNAL_HAVE_SSSE3
#error ABSL_INTERNAL_HAVE_SSSE3 cannot be directly set
#elif defined(__SSSE3__)
#define ABSL_INTERNAL_HAVE_SSSE3 1
#endif
// ABSL_INTERNAL_HAVE_ARM_NEON is used for compile-time detection of NEON (ARM
// SIMD).
//
// If __CUDA_ARCH__ is defined, then we are compiling CUDA code in device mode.
// In device mode, NEON intrinsics are not available, regardless of host
// platform.
// https://llvm.org/docs/CompileCudaWithLLVM.html#detecting-clang-vs-nvcc-from-code
#ifdef ABSL_INTERNAL_HAVE_ARM_NEON
#error ABSL_INTERNAL_HAVE_ARM_NEON cannot be directly set
#elif defined(__ARM_NEON) && !(defined(__NVCC__) && defined(__CUDACC__))
#define ABSL_INTERNAL_HAVE_ARM_NEON 1
#endif
// ABSL_HAVE_CONSTANT_EVALUATED is used for compile-time detection of
// constant evaluation support through `absl::is_constant_evaluated`.
#ifdef ABSL_HAVE_CONSTANT_EVALUATED
#error ABSL_HAVE_CONSTANT_EVALUATED cannot be directly set
#endif
#ifdef __cpp_lib_is_constant_evaluated
#define ABSL_HAVE_CONSTANT_EVALUATED 1
#elif ABSL_HAVE_BUILTIN(__builtin_is_constant_evaluated)
#define ABSL_HAVE_CONSTANT_EVALUATED 1
#endif
// ABSL_INTERNAL_CONSTEXPR_SINCE_CXXYY is used to conditionally define constexpr
// for different C++ versions.
//
// These macros are an implementation detail and will be unconditionally removed
// once the minimum supported C++ version catches up to a given version.
//
// For this reason, this symbol is considered INTERNAL and code outside of
// Abseil must not use it.
#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 201703L
#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX17 constexpr
#else
#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX17
#endif
#if defined(ABSL_INTERNAL_CPLUSPLUS_LANG) && \
ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20 constexpr
#else
#define ABSL_INTERNAL_CONSTEXPR_SINCE_CXX20
#endif
// ABSL_INTERNAL_EMSCRIPTEN_VERSION combines Emscripten's three version macros
// into an integer that can be compared against.
#ifdef ABSL_INTERNAL_EMSCRIPTEN_VERSION
#error ABSL_INTERNAL_EMSCRIPTEN_VERSION cannot be directly set
#endif
#ifdef __EMSCRIPTEN__
#include <emscripten/version.h>
#ifdef __EMSCRIPTEN_major__
#if __EMSCRIPTEN_minor__ >= 1000
#error __EMSCRIPTEN_minor__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION
#endif
#if __EMSCRIPTEN_tiny__ >= 1000
#error __EMSCRIPTEN_tiny__ is too big to fit in ABSL_INTERNAL_EMSCRIPTEN_VERSION
#endif
#define ABSL_INTERNAL_EMSCRIPTEN_VERSION \
((__EMSCRIPTEN_major__) * 1000000 + (__EMSCRIPTEN_minor__) * 1000 + \
(__EMSCRIPTEN_tiny__))
#endif
#endif
#endif // ABSL_BASE_CONFIG_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/config.h"
#include <cstdint>
#include "gtest/gtest.h"
#include "absl/synchronization/internal/thread_pool.h"
namespace {
TEST(ConfigTest, Endianness) {
union {
uint32_t value;
uint8_t data[sizeof(uint32_t)];
} number;
number.data[0] = 0x00;
number.data[1] = 0x01;
number.data[2] = 0x02;
number.data[3] = 0x03;
#if defined(ABSL_IS_LITTLE_ENDIAN) && defined(ABSL_IS_BIG_ENDIAN)
#error Both ABSL_IS_LITTLE_ENDIAN and ABSL_IS_BIG_ENDIAN are defined
#elif defined(ABSL_IS_LITTLE_ENDIAN)
EXPECT_EQ(UINT32_C(0x03020100), number.value);
#elif defined(ABSL_IS_BIG_ENDIAN)
EXPECT_EQ(UINT32_C(0x00010203), number.value);
#else
#error Unknown endianness
#endif
}
#if defined(ABSL_HAVE_THREAD_LOCAL)
TEST(ConfigTest, ThreadLocal) {
static thread_local int mine_mine_mine = 16;
EXPECT_EQ(16, mine_mine_mine);
{
absl::synchronization_internal::ThreadPool pool(1);
pool.Schedule([&] {
EXPECT_EQ(16, mine_mine_mine);
mine_mine_mine = 32;
EXPECT_EQ(32, mine_mine_mine);
});
}
EXPECT_EQ(16, mine_mine_mine);
}
#endif
} // namespace

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// kConstInit
// -----------------------------------------------------------------------------
//
// A constructor tag used to mark an object as safe for use as a global
// variable, avoiding the usual lifetime issues that can affect globals.
#ifndef ABSL_BASE_CONST_INIT_H_
#define ABSL_BASE_CONST_INIT_H_
#include "absl/base/config.h"
// In general, objects with static storage duration (such as global variables)
// can trigger tricky object lifetime situations. Attempting to access them
// from the constructors or destructors of other global objects can result in
// undefined behavior, unless their constructors and destructors are designed
// with this issue in mind.
//
// The normal way to deal with this issue in C++11 is to use constant
// initialization and trivial destructors.
//
// Constant initialization is guaranteed to occur before any other code
// executes. Constructors that are declared 'constexpr' are eligible for
// constant initialization. You can annotate a variable declaration with the
// ABSL_CONST_INIT macro to express this intent. For compilers that support
// it, this annotation will cause a compilation error for declarations that
// aren't subject to constant initialization (perhaps because a runtime value
// was passed as a constructor argument).
//
// On program shutdown, lifetime issues can be avoided on global objects by
// ensuring that they contain trivial destructors. A class has a trivial
// destructor unless it has a user-defined destructor, a virtual method or base
// class, or a data member or base class with a non-trivial destructor of its
// own. Objects with static storage duration and a trivial destructor are not
// cleaned up on program shutdown, and are thus safe to access from other code
// running during shutdown.
//
// For a few core Abseil classes, we make a best effort to allow for safe global
// instances, even though these classes have non-trivial destructors. These
// objects can be created with the absl::kConstInit tag. For example:
// ABSL_CONST_INIT absl::Mutex global_mutex(absl::kConstInit);
//
// The line above declares a global variable of type absl::Mutex which can be
// accessed at any point during startup or shutdown. global_mutex's destructor
// will still run, but will not invalidate the object. Note that C++ specifies
// that accessing an object after its destructor has run results in undefined
// behavior, but this pattern works on the toolchains we support.
//
// The absl::kConstInit tag should only be used to define objects with static
// or thread_local storage duration.
namespace absl {
ABSL_NAMESPACE_BEGIN
enum ConstInitType {
kConstInit,
};
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_CONST_INIT_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file defines dynamic annotations for use with dynamic analysis tool
// such as valgrind, PIN, etc.
//
// Dynamic annotation is a source code annotation that affects the generated
// code (that is, the annotation is not a comment). Each such annotation is
// attached to a particular instruction and/or to a particular object (address)
// in the program.
//
// The annotations that should be used by users are macros in all upper-case
// (e.g., ABSL_ANNOTATE_THREAD_NAME).
//
// Actual implementation of these macros may differ depending on the dynamic
// analysis tool being used.
//
// This file supports the following configurations:
// - Dynamic Annotations enabled (with static thread-safety warnings disabled).
// In this case, macros expand to functions implemented by Thread Sanitizer,
// when building with TSan. When not provided an external implementation,
// dynamic_annotations.cc provides no-op implementations.
//
// - Static Clang thread-safety warnings enabled.
// When building with a Clang compiler that supports thread-safety warnings,
// a subset of annotations can be statically-checked at compile-time. We
// expand these macros to static-inline functions that can be analyzed for
// thread-safety, but afterwards elided when building the final binary.
//
// - All annotations are disabled.
// If neither Dynamic Annotations nor Clang thread-safety warnings are
// enabled, then all annotation-macros expand to empty.
#ifndef ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
#define ABSL_BASE_DYNAMIC_ANNOTATIONS_H_
#include <stddef.h>
#include <stdint.h>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#ifdef __cplusplus
#include "absl/base/macros.h"
#endif
#ifdef ABSL_HAVE_HWADDRESS_SANITIZER
#include <sanitizer/hwasan_interface.h>
#endif
// -------------------------------------------------------------------------
// Decide which features are enabled.
#ifdef ABSL_HAVE_THREAD_SANITIZER
#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 1
#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 1
#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 1
#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED 1
#else
#define ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED 0
#define ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED 0
#define ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED 0
// Clang provides limited support for static thread-safety analysis through a
// feature called Annotalysis. We configure macro-definitions according to
// whether Annotalysis support is available. When running in opt-mode, GCC
// will issue a warning, if these attributes are compiled. Only include them
// when compiling using Clang.
#if defined(__clang__)
#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 1
#if !defined(SWIG)
#define ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED 1
#endif
#else
#define ABSL_INTERNAL_ANNOTALYSIS_ENABLED 0
#endif
// Read/write annotations are enabled in Annotalysis mode; disabled otherwise.
#define ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED \
ABSL_INTERNAL_ANNOTALYSIS_ENABLED
#endif // ABSL_HAVE_THREAD_SANITIZER
#ifdef __cplusplus
#define ABSL_INTERNAL_BEGIN_EXTERN_C extern "C" {
#define ABSL_INTERNAL_END_EXTERN_C } // extern "C"
#define ABSL_INTERNAL_GLOBAL_SCOPED(F) ::F
#define ABSL_INTERNAL_STATIC_INLINE inline
#else
#define ABSL_INTERNAL_BEGIN_EXTERN_C // empty
#define ABSL_INTERNAL_END_EXTERN_C // empty
#define ABSL_INTERNAL_GLOBAL_SCOPED(F) F
#define ABSL_INTERNAL_STATIC_INLINE static inline
#endif
// -------------------------------------------------------------------------
// Define race annotations.
#if ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 1
// Some of the symbols used in this section (e.g. AnnotateBenignRaceSized) are
// defined by the compiler-based sanitizer implementation, not by the Abseil
// library. Therefore they do not use ABSL_INTERNAL_C_SYMBOL.
// -------------------------------------------------------------
// Annotations that suppress errors. It is usually better to express the
// program's synchronization using the other annotations, but these can be used
// when all else fails.
// Report that we may have a benign race at `pointer`, with size
// "sizeof(*(pointer))". `pointer` must be a non-void* pointer. Insert at the
// point where `pointer` has been allocated, preferably close to the point
// where the race happens. See also ABSL_ANNOTATE_BENIGN_RACE_STATIC.
#define ABSL_ANNOTATE_BENIGN_RACE(pointer, description) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
(__FILE__, __LINE__, pointer, sizeof(*(pointer)), description)
// Same as ABSL_ANNOTATE_BENIGN_RACE(`address`, `description`), but applies to
// the memory range [`address`, `address`+`size`).
#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateBenignRaceSized) \
(__FILE__, __LINE__, address, size, description)
// Enable (`enable`!=0) or disable (`enable`==0) race detection for all threads.
// This annotation could be useful if you want to skip expensive race analysis
// during some period of program execution, e.g. during initialization.
#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateEnableRaceDetection) \
(__FILE__, __LINE__, enable)
// -------------------------------------------------------------
// Annotations useful for debugging.
// Report the current thread `name` to a race detector.
#define ABSL_ANNOTATE_THREAD_NAME(name) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateThreadName)(__FILE__, __LINE__, name)
// -------------------------------------------------------------
// Annotations useful when implementing locks. They are not normally needed by
// modules that merely use locks. The `lock` argument is a pointer to the lock
// object.
// Report that a lock has been created at address `lock`.
#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreate)(__FILE__, __LINE__, lock)
// Report that a linker initialized lock has been created at address `lock`.
#ifdef ABSL_HAVE_THREAD_SANITIZER
#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockCreateStatic) \
(__FILE__, __LINE__, lock)
#else
#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) \
ABSL_ANNOTATE_RWLOCK_CREATE(lock)
#endif
// Report that the lock at address `lock` is about to be destroyed.
#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockDestroy)(__FILE__, __LINE__, lock)
// Report that the lock at address `lock` has been acquired.
// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockAcquired) \
(__FILE__, __LINE__, lock, is_w)
// Report that the lock at address `lock` is about to be released.
// `is_w`=1 for writer lock, `is_w`=0 for reader lock.
#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateRWLockReleased) \
(__FILE__, __LINE__, lock, is_w)
// Apply ABSL_ANNOTATE_BENIGN_RACE_SIZED to a static variable `static_var`.
#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) \
namespace { \
class static_var##_annotator { \
public: \
static_var##_annotator() { \
ABSL_ANNOTATE_BENIGN_RACE_SIZED(&static_var, sizeof(static_var), \
#static_var ": " description); \
} \
}; \
static static_var##_annotator the##static_var##_annotator; \
} // namespace
// Function prototypes of annotations provided by the compiler-based sanitizer
// implementation.
ABSL_INTERNAL_BEGIN_EXTERN_C
void AnnotateRWLockCreate(const char* file, int line,
const volatile void* lock);
void AnnotateRWLockCreateStatic(const char* file, int line,
const volatile void* lock);
void AnnotateRWLockDestroy(const char* file, int line,
const volatile void* lock);
void AnnotateRWLockAcquired(const char* file, int line,
const volatile void* lock, long is_w); // NOLINT
void AnnotateRWLockReleased(const char* file, int line,
const volatile void* lock, long is_w); // NOLINT
void AnnotateBenignRace(const char* file, int line,
const volatile void* address, const char* description);
void AnnotateBenignRaceSized(const char* file, int line,
const volatile void* address, size_t size,
const char* description);
void AnnotateThreadName(const char* file, int line, const char* name);
void AnnotateEnableRaceDetection(const char* file, int line, int enable);
ABSL_INTERNAL_END_EXTERN_C
#else // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED == 0
#define ABSL_ANNOTATE_RWLOCK_CREATE(lock) // empty
#define ABSL_ANNOTATE_RWLOCK_CREATE_STATIC(lock) // empty
#define ABSL_ANNOTATE_RWLOCK_DESTROY(lock) // empty
#define ABSL_ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) // empty
#define ABSL_ANNOTATE_RWLOCK_RELEASED(lock, is_w) // empty
#define ABSL_ANNOTATE_BENIGN_RACE(address, description) // empty
#define ABSL_ANNOTATE_BENIGN_RACE_SIZED(address, size, description) // empty
#define ABSL_ANNOTATE_THREAD_NAME(name) // empty
#define ABSL_ANNOTATE_ENABLE_RACE_DETECTION(enable) // empty
#define ABSL_ANNOTATE_BENIGN_RACE_STATIC(static_var, description) // empty
#endif // ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
// -------------------------------------------------------------------------
// Define memory annotations.
#ifdef ABSL_HAVE_MEMORY_SANITIZER
#include <sanitizer/msan_interface.h>
#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) \
__msan_unpoison(address, size)
#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) \
__msan_allocated_memory(address, size)
#else // !defined(ABSL_HAVE_MEMORY_SANITIZER)
#define ABSL_ANNOTATE_MEMORY_IS_INITIALIZED(address, size) // empty
#define ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(address, size) // empty
#endif // ABSL_HAVE_MEMORY_SANITIZER
// -------------------------------------------------------------------------
// Define IGNORE_READS_BEGIN/_END attributes.
#if defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE \
__attribute((exclusive_lock_function("*")))
#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE \
__attribute((unlock_function("*")))
#else // !defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
#define ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE // empty
#define ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE // empty
#endif // defined(ABSL_INTERNAL_IGNORE_READS_ATTRIBUTE_ENABLED)
// -------------------------------------------------------------------------
// Define IGNORE_READS_BEGIN/_END annotations.
#if ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED == 1
// Some of the symbols used in this section (e.g. AnnotateIgnoreReadsBegin) are
// defined by the compiler-based implementation, not by the Abseil
// library. Therefore they do not use ABSL_INTERNAL_C_SYMBOL.
// Request the analysis tool to ignore all reads in the current thread until
// ABSL_ANNOTATE_IGNORE_READS_END is called. Useful to ignore intentional racey
// reads, while still checking other reads and all writes.
// See also ABSL_ANNOTATE_UNPROTECTED_READ.
#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsBegin) \
(__FILE__, __LINE__)
// Stop ignoring reads.
#define ABSL_ANNOTATE_IGNORE_READS_END() \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreReadsEnd) \
(__FILE__, __LINE__)
// Function prototypes of annotations provided by the compiler-based sanitizer
// implementation.
ABSL_INTERNAL_BEGIN_EXTERN_C
void AnnotateIgnoreReadsBegin(const char* file, int line)
ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE;
void AnnotateIgnoreReadsEnd(const char* file,
int line) ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE;
ABSL_INTERNAL_END_EXTERN_C
#elif defined(ABSL_INTERNAL_ANNOTALYSIS_ENABLED)
// When Annotalysis is enabled without Dynamic Annotations, the use of
// static-inline functions allows the annotations to be read at compile-time,
// while still letting the compiler elide the functions from the final build.
//
// TODO(delesley) -- The exclusive lock here ignores writes as well, but
// allows IGNORE_READS_AND_WRITES to work properly.
#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() \
ABSL_INTERNAL_GLOBAL_SCOPED( \
ABSL_INTERNAL_C_SYMBOL(AbslInternalAnnotateIgnoreReadsBegin)) \
()
#define ABSL_ANNOTATE_IGNORE_READS_END() \
ABSL_INTERNAL_GLOBAL_SCOPED( \
ABSL_INTERNAL_C_SYMBOL(AbslInternalAnnotateIgnoreReadsEnd)) \
()
ABSL_INTERNAL_STATIC_INLINE void ABSL_INTERNAL_C_SYMBOL(
AbslInternalAnnotateIgnoreReadsBegin)()
ABSL_INTERNAL_IGNORE_READS_BEGIN_ATTRIBUTE {}
ABSL_INTERNAL_STATIC_INLINE void ABSL_INTERNAL_C_SYMBOL(
AbslInternalAnnotateIgnoreReadsEnd)()
ABSL_INTERNAL_IGNORE_READS_END_ATTRIBUTE {}
#else
#define ABSL_ANNOTATE_IGNORE_READS_BEGIN() // empty
#define ABSL_ANNOTATE_IGNORE_READS_END() // empty
#endif
// -------------------------------------------------------------------------
// Define IGNORE_WRITES_BEGIN/_END annotations.
#if ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED == 1
// Similar to ABSL_ANNOTATE_IGNORE_READS_BEGIN, but ignore writes instead.
#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesBegin)(__FILE__, __LINE__)
// Stop ignoring writes.
#define ABSL_ANNOTATE_IGNORE_WRITES_END() \
ABSL_INTERNAL_GLOBAL_SCOPED(AnnotateIgnoreWritesEnd)(__FILE__, __LINE__)
// Function prototypes of annotations provided by the compiler-based sanitizer
// implementation.
ABSL_INTERNAL_BEGIN_EXTERN_C
void AnnotateIgnoreWritesBegin(const char* file, int line);
void AnnotateIgnoreWritesEnd(const char* file, int line);
ABSL_INTERNAL_END_EXTERN_C
#else
#define ABSL_ANNOTATE_IGNORE_WRITES_BEGIN() // empty
#define ABSL_ANNOTATE_IGNORE_WRITES_END() // empty
#endif
// -------------------------------------------------------------------------
// Define the ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_* annotations using the more
// primitive annotations defined above.
//
// Instead of doing
// ABSL_ANNOTATE_IGNORE_READS_BEGIN();
// ... = x;
// ABSL_ANNOTATE_IGNORE_READS_END();
// one can use
// ... = ABSL_ANNOTATE_UNPROTECTED_READ(x);
#if defined(ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED)
// Start ignoring all memory accesses (both reads and writes).
#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \
do { \
ABSL_ANNOTATE_IGNORE_READS_BEGIN(); \
ABSL_ANNOTATE_IGNORE_WRITES_BEGIN(); \
} while (0)
// Stop ignoring both reads and writes.
#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() \
do { \
ABSL_ANNOTATE_IGNORE_WRITES_END(); \
ABSL_ANNOTATE_IGNORE_READS_END(); \
} while (0)
#ifdef __cplusplus
// ABSL_ANNOTATE_UNPROTECTED_READ is the preferred way to annotate racey reads.
#define ABSL_ANNOTATE_UNPROTECTED_READ(x) \
absl::base_internal::AnnotateUnprotectedRead(x)
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
template <typename T>
inline T AnnotateUnprotectedRead(const volatile T& x) { // NOLINT
ABSL_ANNOTATE_IGNORE_READS_BEGIN();
T res = x;
ABSL_ANNOTATE_IGNORE_READS_END();
return res;
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif
#else
#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() // empty
#define ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END() // empty
#define ABSL_ANNOTATE_UNPROTECTED_READ(x) (x)
#endif
// -------------------------------------------------------------------------
// Address sanitizer annotations
#ifdef ABSL_HAVE_ADDRESS_SANITIZER
// Describe the current state of a contiguous container such as e.g.
// std::vector or std::string. For more details see
// sanitizer/common_interface_defs.h, which is provided by the compiler.
#include <sanitizer/common_interface_defs.h>
#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) \
__sanitizer_annotate_contiguous_container(beg, end, old_mid, new_mid)
#define ABSL_ADDRESS_SANITIZER_REDZONE(name) \
struct { \
alignas(8) char x[8]; \
} name
#else
#define ABSL_ANNOTATE_CONTIGUOUS_CONTAINER(beg, end, old_mid, new_mid) // empty
#define ABSL_ADDRESS_SANITIZER_REDZONE(name) static_assert(true, "")
#endif // ABSL_HAVE_ADDRESS_SANITIZER
// -------------------------------------------------------------------------
// HWAddress sanitizer annotations
#ifdef __cplusplus
namespace absl {
#ifdef ABSL_HAVE_HWADDRESS_SANITIZER
// Under HWASAN changes the tag of the pointer.
template <typename T>
T* HwasanTagPointer(T* ptr, uintptr_t tag) {
return reinterpret_cast<T*>(__hwasan_tag_pointer(ptr, tag));
}
#else
template <typename T>
T* HwasanTagPointer(T* ptr, uintptr_t) {
return ptr;
}
#endif
} // namespace absl
#endif
// -------------------------------------------------------------------------
// Undefine the macros intended only for this file.
#undef ABSL_INTERNAL_RACE_ANNOTATIONS_ENABLED
#undef ABSL_INTERNAL_READS_ANNOTATIONS_ENABLED
#undef ABSL_INTERNAL_WRITES_ANNOTATIONS_ENABLED
#undef ABSL_INTERNAL_ANNOTALYSIS_ENABLED
#undef ABSL_INTERNAL_READS_WRITES_ANNOTATIONS_ENABLED
#undef ABSL_INTERNAL_BEGIN_EXTERN_C
#undef ABSL_INTERNAL_END_EXTERN_C
#undef ABSL_INTERNAL_STATIC_INLINE
#endif // ABSL_BASE_DYNAMIC_ANNOTATIONS_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/exception_safety_testing.h"
#ifdef ABSL_HAVE_EXCEPTIONS
#include <cstddef>
#include <exception>
#include <iostream>
#include <list>
#include <type_traits>
#include <vector>
#include "gtest/gtest-spi.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
namespace testing {
namespace {
using ::testing::exceptions_internal::SetCountdown;
using ::testing::exceptions_internal::TestException;
using ::testing::exceptions_internal::UnsetCountdown;
// EXPECT_NO_THROW can't inspect the thrown inspection in general.
template <typename F>
void ExpectNoThrow(const F& f) {
try {
f();
} catch (const TestException& e) {
ADD_FAILURE() << "Unexpected exception thrown from " << e.what();
}
}
TEST(ThrowingValueTest, Throws) {
SetCountdown();
EXPECT_THROW(ThrowingValue<> bomb, TestException);
// It's not guaranteed that every operator only throws *once*. The default
// ctor only throws once, though, so use it to make sure we only throw when
// the countdown hits 0
SetCountdown(2);
ExpectNoThrow([]() { ThrowingValue<> bomb; });
ExpectNoThrow([]() { ThrowingValue<> bomb; });
EXPECT_THROW(ThrowingValue<> bomb, TestException);
UnsetCountdown();
}
// Tests that an operation throws when the countdown is at 0, doesn't throw when
// the countdown doesn't hit 0, and doesn't modify the state of the
// ThrowingValue if it throws
template <typename F>
void TestOp(const F& f) {
ExpectNoThrow(f);
SetCountdown();
EXPECT_THROW(f(), TestException);
UnsetCountdown();
}
TEST(ThrowingValueTest, ThrowingCtors) {
ThrowingValue<> bomb;
TestOp([]() { ThrowingValue<> bomb(1); });
TestOp([&]() { ThrowingValue<> bomb1 = bomb; });
TestOp([&]() { ThrowingValue<> bomb1 = std::move(bomb); });
}
TEST(ThrowingValueTest, ThrowingAssignment) {
ThrowingValue<> bomb, bomb1;
TestOp([&]() { bomb = bomb1; });
TestOp([&]() { bomb = std::move(bomb1); });
// Test that when assignment throws, the assignment should fail (lhs != rhs)
// and strong guarantee fails (lhs != lhs_copy).
{
ThrowingValue<> lhs(39), rhs(42);
ThrowingValue<> lhs_copy(lhs);
SetCountdown();
EXPECT_THROW(lhs = rhs, TestException);
UnsetCountdown();
EXPECT_NE(lhs, rhs);
EXPECT_NE(lhs_copy, lhs);
}
{
ThrowingValue<> lhs(39), rhs(42);
ThrowingValue<> lhs_copy(lhs), rhs_copy(rhs);
SetCountdown();
EXPECT_THROW(lhs = std::move(rhs), TestException);
UnsetCountdown();
EXPECT_NE(lhs, rhs_copy);
EXPECT_NE(lhs_copy, lhs);
}
}
TEST(ThrowingValueTest, ThrowingComparisons) {
ThrowingValue<> bomb1, bomb2;
TestOp([&]() { return bomb1 == bomb2; });
TestOp([&]() { return bomb1 != bomb2; });
TestOp([&]() { return bomb1 < bomb2; });
TestOp([&]() { return bomb1 <= bomb2; });
TestOp([&]() { return bomb1 > bomb2; });
TestOp([&]() { return bomb1 >= bomb2; });
}
TEST(ThrowingValueTest, ThrowingArithmeticOps) {
ThrowingValue<> bomb1(1), bomb2(2);
TestOp([&bomb1]() { +bomb1; });
TestOp([&bomb1]() { -bomb1; });
TestOp([&bomb1]() { ++bomb1; });
TestOp([&bomb1]() { bomb1++; });
TestOp([&bomb1]() { --bomb1; });
TestOp([&bomb1]() { bomb1--; });
TestOp([&]() { bomb1 + bomb2; });
TestOp([&]() { bomb1 - bomb2; });
TestOp([&]() { bomb1* bomb2; });
TestOp([&]() { bomb1 / bomb2; });
TestOp([&]() { bomb1 << 1; });
TestOp([&]() { bomb1 >> 1; });
}
TEST(ThrowingValueTest, ThrowingLogicalOps) {
ThrowingValue<> bomb1, bomb2;
TestOp([&bomb1]() { !bomb1; });
TestOp([&]() { bomb1&& bomb2; });
TestOp([&]() { bomb1 || bomb2; });
}
TEST(ThrowingValueTest, ThrowingBitwiseOps) {
ThrowingValue<> bomb1, bomb2;
TestOp([&bomb1]() { ~bomb1; });
TestOp([&]() { bomb1 & bomb2; });
TestOp([&]() { bomb1 | bomb2; });
TestOp([&]() { bomb1 ^ bomb2; });
}
TEST(ThrowingValueTest, ThrowingCompoundAssignmentOps) {
ThrowingValue<> bomb1(1), bomb2(2);
TestOp([&]() { bomb1 += bomb2; });
TestOp([&]() { bomb1 -= bomb2; });
TestOp([&]() { bomb1 *= bomb2; });
TestOp([&]() { bomb1 /= bomb2; });
TestOp([&]() { bomb1 %= bomb2; });
TestOp([&]() { bomb1 &= bomb2; });
TestOp([&]() { bomb1 |= bomb2; });
TestOp([&]() { bomb1 ^= bomb2; });
TestOp([&]() { bomb1 *= bomb2; });
}
TEST(ThrowingValueTest, ThrowingStreamOps) {
ThrowingValue<> bomb;
TestOp([&]() {
std::istringstream stream;
stream >> bomb;
});
TestOp([&]() {
std::stringstream stream;
stream << bomb;
});
}
// Tests the operator<< of ThrowingValue by forcing ConstructorTracker to emit
// a nonfatal failure that contains the string representation of the Thrower
TEST(ThrowingValueTest, StreamOpsOutput) {
using ::testing::TypeSpec;
exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
// Test default spec list (kEverythingThrows)
EXPECT_NONFATAL_FAILURE(
{
using Thrower = ThrowingValue<TypeSpec{}>;
auto thrower = Thrower(123);
thrower.~Thrower();
},
"ThrowingValue<>(123)");
// Test with one item in spec list (kNoThrowCopy)
EXPECT_NONFATAL_FAILURE(
{
using Thrower = ThrowingValue<TypeSpec::kNoThrowCopy>;
auto thrower = Thrower(234);
thrower.~Thrower();
},
"ThrowingValue<kNoThrowCopy>(234)");
// Test with multiple items in spec list (kNoThrowMove, kNoThrowNew)
EXPECT_NONFATAL_FAILURE(
{
using Thrower =
ThrowingValue<TypeSpec::kNoThrowMove | TypeSpec::kNoThrowNew>;
auto thrower = Thrower(345);
thrower.~Thrower();
},
"ThrowingValue<kNoThrowMove | kNoThrowNew>(345)");
// Test with all items in spec list (kNoThrowCopy, kNoThrowMove, kNoThrowNew)
EXPECT_NONFATAL_FAILURE(
{
using Thrower = ThrowingValue<static_cast<TypeSpec>(-1)>;
auto thrower = Thrower(456);
thrower.~Thrower();
},
"ThrowingValue<kNoThrowCopy | kNoThrowMove | kNoThrowNew>(456)");
}
template <typename F>
void TestAllocatingOp(const F& f) {
ExpectNoThrow(f);
SetCountdown();
EXPECT_THROW(f(), exceptions_internal::TestBadAllocException);
UnsetCountdown();
}
TEST(ThrowingValueTest, ThrowingAllocatingOps) {
// make_unique calls unqualified operator new, so these exercise the
// ThrowingValue overloads.
TestAllocatingOp([]() { return absl::make_unique<ThrowingValue<>>(1); });
TestAllocatingOp([]() { return absl::make_unique<ThrowingValue<>[]>(2); });
}
TEST(ThrowingValueTest, NonThrowingMoveCtor) {
ThrowingValue<TypeSpec::kNoThrowMove> nothrow_ctor;
SetCountdown();
ExpectNoThrow([&nothrow_ctor]() {
ThrowingValue<TypeSpec::kNoThrowMove> nothrow1 = std::move(nothrow_ctor);
});
UnsetCountdown();
}
TEST(ThrowingValueTest, NonThrowingMoveAssign) {
ThrowingValue<TypeSpec::kNoThrowMove> nothrow_assign1, nothrow_assign2;
SetCountdown();
ExpectNoThrow([&nothrow_assign1, &nothrow_assign2]() {
nothrow_assign1 = std::move(nothrow_assign2);
});
UnsetCountdown();
}
TEST(ThrowingValueTest, ThrowingCopyCtor) {
ThrowingValue<> tv;
TestOp([&]() { ThrowingValue<> tv_copy(tv); });
}
TEST(ThrowingValueTest, ThrowingCopyAssign) {
ThrowingValue<> tv1, tv2;
TestOp([&]() { tv1 = tv2; });
}
TEST(ThrowingValueTest, NonThrowingCopyCtor) {
ThrowingValue<TypeSpec::kNoThrowCopy> nothrow_ctor;
SetCountdown();
ExpectNoThrow([&nothrow_ctor]() {
ThrowingValue<TypeSpec::kNoThrowCopy> nothrow1(nothrow_ctor);
});
UnsetCountdown();
}
TEST(ThrowingValueTest, NonThrowingCopyAssign) {
ThrowingValue<TypeSpec::kNoThrowCopy> nothrow_assign1, nothrow_assign2;
SetCountdown();
ExpectNoThrow([&nothrow_assign1, &nothrow_assign2]() {
nothrow_assign1 = nothrow_assign2;
});
UnsetCountdown();
}
TEST(ThrowingValueTest, ThrowingSwap) {
ThrowingValue<> bomb1, bomb2;
TestOp([&]() { std::swap(bomb1, bomb2); });
}
TEST(ThrowingValueTest, NonThrowingSwap) {
ThrowingValue<TypeSpec::kNoThrowMove> bomb1, bomb2;
ExpectNoThrow([&]() { std::swap(bomb1, bomb2); });
}
TEST(ThrowingValueTest, NonThrowingAllocation) {
ThrowingValue<TypeSpec::kNoThrowNew>* allocated;
ThrowingValue<TypeSpec::kNoThrowNew>* array;
ExpectNoThrow([&allocated]() {
allocated = new ThrowingValue<TypeSpec::kNoThrowNew>(1);
delete allocated;
});
ExpectNoThrow([&array]() {
array = new ThrowingValue<TypeSpec::kNoThrowNew>[2];
delete[] array;
});
}
TEST(ThrowingValueTest, NonThrowingDelete) {
auto* allocated = new ThrowingValue<>(1);
auto* array = new ThrowingValue<>[2];
SetCountdown();
ExpectNoThrow([allocated]() { delete allocated; });
SetCountdown();
ExpectNoThrow([array]() { delete[] array; });
UnsetCountdown();
}
TEST(ThrowingValueTest, NonThrowingPlacementDelete) {
constexpr int kArrayLen = 2;
// We intentionally create extra space to store the tag allocated by placement
// new[].
constexpr size_t kExtraSpaceLen = sizeof(size_t) * 2;
alignas(ThrowingValue<>) unsigned char buf[sizeof(ThrowingValue<>)];
alignas(ThrowingValue<>) unsigned char
array_buf[kExtraSpaceLen + sizeof(ThrowingValue<>[kArrayLen])];
auto* placed = new (&buf) ThrowingValue<>(1);
auto placed_array = new (&array_buf) ThrowingValue<>[kArrayLen];
auto* placed_array_end = reinterpret_cast<unsigned char*>(placed_array) +
sizeof(ThrowingValue<>[kArrayLen]);
EXPECT_LE(placed_array_end, array_buf + sizeof(array_buf));
SetCountdown();
ExpectNoThrow([placed, &buf]() {
placed->~ThrowingValue<>();
ThrowingValue<>::operator delete(placed, &buf);
});
SetCountdown();
ExpectNoThrow([&, placed_array]() {
for (int i = 0; i < kArrayLen; ++i) placed_array[i].~ThrowingValue<>();
ThrowingValue<>::operator delete[](placed_array, &array_buf);
});
UnsetCountdown();
}
TEST(ThrowingValueTest, NonThrowingDestructor) {
auto* allocated = new ThrowingValue<>();
SetCountdown();
ExpectNoThrow([allocated]() { delete allocated; });
UnsetCountdown();
}
TEST(ThrowingBoolTest, ThrowingBool) {
ThrowingBool t = true;
// Test that it's contextually convertible to bool
if (t) { // NOLINT(whitespace/empty_if_body)
}
EXPECT_TRUE(t);
TestOp([&]() { (void)!t; });
}
TEST(ThrowingAllocatorTest, MemoryManagement) {
// Just exercise the memory management capabilities under LSan to make sure we
// don't leak.
ThrowingAllocator<int> int_alloc;
int* ip = int_alloc.allocate(1);
int_alloc.deallocate(ip, 1);
int* i_array = int_alloc.allocate(2);
int_alloc.deallocate(i_array, 2);
ThrowingAllocator<ThrowingValue<>> tv_alloc;
ThrowingValue<>* ptr = tv_alloc.allocate(1);
tv_alloc.deallocate(ptr, 1);
ThrowingValue<>* tv_array = tv_alloc.allocate(2);
tv_alloc.deallocate(tv_array, 2);
}
TEST(ThrowingAllocatorTest, CallsGlobalNew) {
ThrowingAllocator<ThrowingValue<>, AllocSpec::kNoThrowAllocate> nothrow_alloc;
ThrowingValue<>* ptr;
SetCountdown();
// This will only throw if ThrowingValue::new is called.
ExpectNoThrow([&]() { ptr = nothrow_alloc.allocate(1); });
nothrow_alloc.deallocate(ptr, 1);
UnsetCountdown();
}
TEST(ThrowingAllocatorTest, ThrowingConstructors) {
ThrowingAllocator<int> int_alloc;
int* ip = nullptr;
SetCountdown();
EXPECT_THROW(ip = int_alloc.allocate(1), TestException);
ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
*ip = 1;
SetCountdown();
EXPECT_THROW(int_alloc.construct(ip, 2), TestException);
EXPECT_EQ(*ip, 1);
int_alloc.deallocate(ip, 1);
UnsetCountdown();
}
TEST(ThrowingAllocatorTest, NonThrowingConstruction) {
{
ThrowingAllocator<int, AllocSpec::kNoThrowAllocate> int_alloc;
int* ip = nullptr;
SetCountdown();
ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
SetCountdown();
ExpectNoThrow([&]() { int_alloc.construct(ip, 2); });
EXPECT_EQ(*ip, 2);
int_alloc.deallocate(ip, 1);
UnsetCountdown();
}
{
ThrowingAllocator<int> int_alloc;
int* ip = nullptr;
ExpectNoThrow([&]() { ip = int_alloc.allocate(1); });
ExpectNoThrow([&]() { int_alloc.construct(ip, 2); });
EXPECT_EQ(*ip, 2);
int_alloc.deallocate(ip, 1);
}
{
ThrowingAllocator<ThrowingValue<>, AllocSpec::kNoThrowAllocate>
nothrow_alloc;
ThrowingValue<>* ptr;
SetCountdown();
ExpectNoThrow([&]() { ptr = nothrow_alloc.allocate(1); });
SetCountdown();
ExpectNoThrow(
[&]() { nothrow_alloc.construct(ptr, 2, testing::nothrow_ctor); });
EXPECT_EQ(ptr->Get(), 2);
nothrow_alloc.destroy(ptr);
nothrow_alloc.deallocate(ptr, 1);
UnsetCountdown();
}
{
ThrowingAllocator<int> a;
SetCountdown();
ExpectNoThrow([&]() { ThrowingAllocator<double> a1 = a; });
SetCountdown();
ExpectNoThrow([&]() { ThrowingAllocator<double> a1 = std::move(a); });
UnsetCountdown();
}
}
TEST(ThrowingAllocatorTest, ThrowingAllocatorConstruction) {
ThrowingAllocator<int> a;
TestOp([]() { ThrowingAllocator<int> a; });
TestOp([&]() { a.select_on_container_copy_construction(); });
}
TEST(ThrowingAllocatorTest, State) {
ThrowingAllocator<int> a1, a2;
EXPECT_NE(a1, a2);
auto a3 = a1;
EXPECT_EQ(a3, a1);
int* ip = a1.allocate(1);
EXPECT_EQ(a3, a1);
a3.deallocate(ip, 1);
EXPECT_EQ(a3, a1);
}
TEST(ThrowingAllocatorTest, InVector) {
std::vector<ThrowingValue<>, ThrowingAllocator<ThrowingValue<>>> v;
for (int i = 0; i < 20; ++i) v.push_back({});
for (int i = 0; i < 20; ++i) v.pop_back();
}
TEST(ThrowingAllocatorTest, InList) {
std::list<ThrowingValue<>, ThrowingAllocator<ThrowingValue<>>> l;
for (int i = 0; i < 20; ++i) l.push_back({});
for (int i = 0; i < 20; ++i) l.pop_back();
for (int i = 0; i < 20; ++i) l.push_front({});
for (int i = 0; i < 20; ++i) l.pop_front();
}
template <typename TesterInstance, typename = void>
struct NullaryTestValidator : public std::false_type {};
template <typename TesterInstance>
struct NullaryTestValidator<
TesterInstance,
absl::void_t<decltype(std::declval<TesterInstance>().Test())>>
: public std::true_type {};
template <typename TesterInstance>
bool HasNullaryTest(const TesterInstance&) {
return NullaryTestValidator<TesterInstance>::value;
}
void DummyOp(void*) {}
template <typename TesterInstance, typename = void>
struct UnaryTestValidator : public std::false_type {};
template <typename TesterInstance>
struct UnaryTestValidator<
TesterInstance,
absl::void_t<decltype(std::declval<TesterInstance>().Test(DummyOp))>>
: public std::true_type {};
template <typename TesterInstance>
bool HasUnaryTest(const TesterInstance&) {
return UnaryTestValidator<TesterInstance>::value;
}
TEST(ExceptionSafetyTesterTest, IncompleteTypesAreNotTestable) {
using T = exceptions_internal::UninitializedT;
auto op = [](T* t) {};
auto inv = [](T*) { return testing::AssertionSuccess(); };
auto fac = []() { return absl::make_unique<T>(); };
// Test that providing operation and inveriants still does not allow for the
// the invocation of .Test() and .Test(op) because it lacks a factory
auto without_fac =
testing::MakeExceptionSafetyTester().WithOperation(op).WithContracts(
inv, testing::strong_guarantee);
EXPECT_FALSE(HasNullaryTest(without_fac));
EXPECT_FALSE(HasUnaryTest(without_fac));
// Test that providing contracts and factory allows the invocation of
// .Test(op) but does not allow for .Test() because it lacks an operation
auto without_op = testing::MakeExceptionSafetyTester()
.WithContracts(inv, testing::strong_guarantee)
.WithFactory(fac);
EXPECT_FALSE(HasNullaryTest(without_op));
EXPECT_TRUE(HasUnaryTest(without_op));
// Test that providing operation and factory still does not allow for the
// the invocation of .Test() and .Test(op) because it lacks contracts
auto without_inv =
testing::MakeExceptionSafetyTester().WithOperation(op).WithFactory(fac);
EXPECT_FALSE(HasNullaryTest(without_inv));
EXPECT_FALSE(HasUnaryTest(without_inv));
}
struct ExampleStruct {};
std::unique_ptr<ExampleStruct> ExampleFunctionFactory() {
return absl::make_unique<ExampleStruct>();
}
void ExampleFunctionOperation(ExampleStruct*) {}
testing::AssertionResult ExampleFunctionContract(ExampleStruct*) {
return testing::AssertionSuccess();
}
struct {
std::unique_ptr<ExampleStruct> operator()() const {
return ExampleFunctionFactory();
}
} example_struct_factory;
struct {
void operator()(ExampleStruct*) const {}
} example_struct_operation;
struct {
testing::AssertionResult operator()(ExampleStruct* example_struct) const {
return ExampleFunctionContract(example_struct);
}
} example_struct_contract;
auto example_lambda_factory = []() { return ExampleFunctionFactory(); };
auto example_lambda_operation = [](ExampleStruct*) {};
auto example_lambda_contract = [](ExampleStruct* example_struct) {
return ExampleFunctionContract(example_struct);
};
// Testing that function references, pointers, structs with operator() and
// lambdas can all be used with ExceptionSafetyTester
TEST(ExceptionSafetyTesterTest, MixedFunctionTypes) {
// function reference
EXPECT_TRUE(testing::MakeExceptionSafetyTester()
.WithFactory(ExampleFunctionFactory)
.WithOperation(ExampleFunctionOperation)
.WithContracts(ExampleFunctionContract)
.Test());
// function pointer
EXPECT_TRUE(testing::MakeExceptionSafetyTester()
.WithFactory(&ExampleFunctionFactory)
.WithOperation(&ExampleFunctionOperation)
.WithContracts(&ExampleFunctionContract)
.Test());
// struct
EXPECT_TRUE(testing::MakeExceptionSafetyTester()
.WithFactory(example_struct_factory)
.WithOperation(example_struct_operation)
.WithContracts(example_struct_contract)
.Test());
// lambda
EXPECT_TRUE(testing::MakeExceptionSafetyTester()
.WithFactory(example_lambda_factory)
.WithOperation(example_lambda_operation)
.WithContracts(example_lambda_contract)
.Test());
}
struct NonNegative {
bool operator==(const NonNegative& other) const { return i == other.i; }
int i;
};
testing::AssertionResult CheckNonNegativeInvariants(NonNegative* g) {
if (g->i >= 0) {
return testing::AssertionSuccess();
}
return testing::AssertionFailure()
<< "i should be non-negative but is " << g->i;
}
struct {
template <typename T>
void operator()(T* t) const {
(*t)();
}
} invoker;
auto tester =
testing::MakeExceptionSafetyTester().WithOperation(invoker).WithContracts(
CheckNonNegativeInvariants);
auto strong_tester = tester.WithContracts(testing::strong_guarantee);
struct FailsBasicGuarantee : public NonNegative {
void operator()() {
--i;
ThrowingValue<> bomb;
++i;
}
};
TEST(ExceptionCheckTest, BasicGuaranteeFailure) {
EXPECT_FALSE(tester.WithInitialValue(FailsBasicGuarantee{}).Test());
}
struct FollowsBasicGuarantee : public NonNegative {
void operator()() {
++i;
ThrowingValue<> bomb;
}
};
TEST(ExceptionCheckTest, BasicGuarantee) {
EXPECT_TRUE(tester.WithInitialValue(FollowsBasicGuarantee{}).Test());
}
TEST(ExceptionCheckTest, StrongGuaranteeFailure) {
EXPECT_FALSE(strong_tester.WithInitialValue(FailsBasicGuarantee{}).Test());
EXPECT_FALSE(strong_tester.WithInitialValue(FollowsBasicGuarantee{}).Test());
}
struct BasicGuaranteeWithExtraContracts : public NonNegative {
// After operator(), i is incremented. If operator() throws, i is set to 9999
void operator()() {
int old_i = i;
i = kExceptionSentinel;
ThrowingValue<> bomb;
i = ++old_i;
}
static constexpr int kExceptionSentinel = 9999;
};
TEST(ExceptionCheckTest, BasicGuaranteeWithExtraContracts) {
auto tester_with_val =
tester.WithInitialValue(BasicGuaranteeWithExtraContracts{});
EXPECT_TRUE(tester_with_val.Test());
EXPECT_TRUE(
tester_with_val
.WithContracts([](BasicGuaranteeWithExtraContracts* o) {
if (o->i == BasicGuaranteeWithExtraContracts::kExceptionSentinel) {
return testing::AssertionSuccess();
}
return testing::AssertionFailure()
<< "i should be "
<< BasicGuaranteeWithExtraContracts::kExceptionSentinel
<< ", but is " << o->i;
})
.Test());
}
struct FollowsStrongGuarantee : public NonNegative {
void operator()() { ThrowingValue<> bomb; }
};
TEST(ExceptionCheckTest, StrongGuarantee) {
EXPECT_TRUE(tester.WithInitialValue(FollowsStrongGuarantee{}).Test());
EXPECT_TRUE(strong_tester.WithInitialValue(FollowsStrongGuarantee{}).Test());
}
struct HasReset : public NonNegative {
void operator()() {
i = -1;
ThrowingValue<> bomb;
i = 1;
}
void reset() { i = 0; }
};
testing::AssertionResult CheckHasResetContracts(HasReset* h) {
h->reset();
return testing::AssertionResult(h->i == 0);
}
TEST(ExceptionCheckTest, ModifyingChecker) {
auto set_to_1000 = [](FollowsBasicGuarantee* g) {
g->i = 1000;
return testing::AssertionSuccess();
};
auto is_1000 = [](FollowsBasicGuarantee* g) {
return testing::AssertionResult(g->i == 1000);
};
auto increment = [](FollowsStrongGuarantee* g) {
++g->i;
return testing::AssertionSuccess();
};
EXPECT_FALSE(tester.WithInitialValue(FollowsBasicGuarantee{})
.WithContracts(set_to_1000, is_1000)
.Test());
EXPECT_TRUE(strong_tester.WithInitialValue(FollowsStrongGuarantee{})
.WithContracts(increment)
.Test());
EXPECT_TRUE(testing::MakeExceptionSafetyTester()
.WithInitialValue(HasReset{})
.WithContracts(CheckHasResetContracts)
.Test(invoker));
}
TEST(ExceptionSafetyTesterTest, ResetsCountdown) {
auto test =
testing::MakeExceptionSafetyTester()
.WithInitialValue(ThrowingValue<>())
.WithContracts([](ThrowingValue<>*) { return AssertionSuccess(); })
.WithOperation([](ThrowingValue<>*) {});
ASSERT_TRUE(test.Test());
// If the countdown isn't reset because there were no exceptions thrown, then
// this will fail with a termination from an unhandled exception
EXPECT_TRUE(test.Test());
}
struct NonCopyable : public NonNegative {
NonCopyable(const NonCopyable&) = delete;
NonCopyable() : NonNegative{0} {}
void operator()() { ThrowingValue<> bomb; }
};
TEST(ExceptionCheckTest, NonCopyable) {
auto factory = []() { return absl::make_unique<NonCopyable>(); };
EXPECT_TRUE(tester.WithFactory(factory).Test());
EXPECT_TRUE(strong_tester.WithFactory(factory).Test());
}
struct NonEqualityComparable : public NonNegative {
void operator()() { ThrowingValue<> bomb; }
void ModifyOnThrow() {
++i;
ThrowingValue<> bomb;
static_cast<void>(bomb);
--i;
}
};
TEST(ExceptionCheckTest, NonEqualityComparable) {
auto nec_is_strong = [](NonEqualityComparable* nec) {
return testing::AssertionResult(nec->i == NonEqualityComparable().i);
};
auto strong_nec_tester = tester.WithInitialValue(NonEqualityComparable{})
.WithContracts(nec_is_strong);
EXPECT_TRUE(strong_nec_tester.Test());
EXPECT_FALSE(strong_nec_tester.Test(
[](NonEqualityComparable* n) { n->ModifyOnThrow(); }));
}
template <typename T>
struct ExhaustivenessTester {
void operator()() {
successes |= 1;
T b1;
static_cast<void>(b1);
successes |= (1 << 1);
T b2;
static_cast<void>(b2);
successes |= (1 << 2);
T b3;
static_cast<void>(b3);
successes |= (1 << 3);
}
bool operator==(const ExhaustivenessTester<ThrowingValue<>>&) const {
return true;
}
static unsigned char successes;
};
struct {
template <typename T>
testing::AssertionResult operator()(ExhaustivenessTester<T>*) const {
return testing::AssertionSuccess();
}
} CheckExhaustivenessTesterContracts;
template <typename T>
unsigned char ExhaustivenessTester<T>::successes = 0;
TEST(ExceptionCheckTest, Exhaustiveness) {
auto exhaust_tester = testing::MakeExceptionSafetyTester()
.WithContracts(CheckExhaustivenessTesterContracts)
.WithOperation(invoker);
EXPECT_TRUE(
exhaust_tester.WithInitialValue(ExhaustivenessTester<int>{}).Test());
EXPECT_EQ(ExhaustivenessTester<int>::successes, 0xF);
EXPECT_TRUE(
exhaust_tester.WithInitialValue(ExhaustivenessTester<ThrowingValue<>>{})
.WithContracts(testing::strong_guarantee)
.Test());
EXPECT_EQ(ExhaustivenessTester<ThrowingValue<>>::successes, 0xF);
}
struct LeaksIfCtorThrows : private exceptions_internal::TrackedObject {
LeaksIfCtorThrows() : TrackedObject(ABSL_PRETTY_FUNCTION) {
++counter;
ThrowingValue<> v;
static_cast<void>(v);
--counter;
}
LeaksIfCtorThrows(const LeaksIfCtorThrows&) noexcept
: TrackedObject(ABSL_PRETTY_FUNCTION) {}
static int counter;
};
int LeaksIfCtorThrows::counter = 0;
TEST(ExceptionCheckTest, TestLeakyCtor) {
testing::TestThrowingCtor<LeaksIfCtorThrows>();
EXPECT_EQ(LeaksIfCtorThrows::counter, 1);
LeaksIfCtorThrows::counter = 0;
}
struct Tracked : private exceptions_internal::TrackedObject {
Tracked() : TrackedObject(ABSL_PRETTY_FUNCTION) {}
};
TEST(ConstructorTrackerTest, CreatedBefore) {
Tracked a, b, c;
exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
}
TEST(ConstructorTrackerTest, CreatedAfter) {
exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
Tracked a, b, c;
}
TEST(ConstructorTrackerTest, NotDestroyedAfter) {
alignas(Tracked) unsigned char storage[sizeof(Tracked)];
EXPECT_NONFATAL_FAILURE(
{
exceptions_internal::ConstructorTracker ct(
exceptions_internal::countdown);
new (&storage) Tracked();
},
"not destroyed");
}
TEST(ConstructorTrackerTest, DestroyedTwice) {
exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
EXPECT_NONFATAL_FAILURE(
{
Tracked t;
t.~Tracked();
},
"re-destroyed");
}
TEST(ConstructorTrackerTest, ConstructedTwice) {
exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
alignas(Tracked) unsigned char storage[sizeof(Tracked)];
EXPECT_NONFATAL_FAILURE(
{
new (&storage) Tracked();
new (&storage) Tracked();
reinterpret_cast<Tracked*>(&storage)->~Tracked();
},
"re-constructed");
}
TEST(ThrowingValueTraitsTest, RelationalOperators) {
ThrowingValue<> a, b;
EXPECT_TRUE((std::is_convertible<decltype(a == b), bool>::value));
EXPECT_TRUE((std::is_convertible<decltype(a != b), bool>::value));
EXPECT_TRUE((std::is_convertible<decltype(a < b), bool>::value));
EXPECT_TRUE((std::is_convertible<decltype(a <= b), bool>::value));
EXPECT_TRUE((std::is_convertible<decltype(a > b), bool>::value));
EXPECT_TRUE((std::is_convertible<decltype(a >= b), bool>::value));
}
TEST(ThrowingAllocatorTraitsTest, Assignablility) {
EXPECT_TRUE(absl::is_move_assignable<ThrowingAllocator<int>>::value);
EXPECT_TRUE(absl::is_copy_assignable<ThrowingAllocator<int>>::value);
EXPECT_TRUE(std::is_nothrow_move_assignable<ThrowingAllocator<int>>::value);
EXPECT_TRUE(std::is_nothrow_copy_assignable<ThrowingAllocator<int>>::value);
}
} // namespace
} // namespace testing
#endif // ABSL_HAVE_EXCEPTIONS

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
#define ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_
#include <atomic>
#include <cassert>
#include <cstdint>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#if defined(_MSC_VER) && !defined(__clang__)
#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 0
#else
#define ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT 1
#endif
#if defined(_MSC_VER)
#define ABSL_HAVE_WORKING_ATOMIC_POINTER 0
#else
#define ABSL_HAVE_WORKING_ATOMIC_POINTER 1
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
template <typename T>
class AtomicHook;
// To workaround AtomicHook not being constant-initializable on some platforms,
// prefer to annotate instances with `ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES`
// instead of `ABSL_CONST_INIT`.
#if ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_CONST_INIT
#else
#define ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
#endif
// `AtomicHook` is a helper class, templatized on a raw function pointer type,
// for implementing Abseil customization hooks. It is a callable object that
// dispatches to the registered hook. Objects of type `AtomicHook` must have
// static or thread storage duration.
//
// A default constructed object performs a no-op (and returns a default
// constructed object) if no hook has been registered.
//
// Hooks can be pre-registered via constant initialization, for example:
//
// ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static AtomicHook<void(*)()>
// my_hook(DefaultAction);
//
// and then changed at runtime via a call to `Store()`.
//
// Reads and writes guarantee memory_order_acquire/memory_order_release
// semantics.
template <typename ReturnType, typename... Args>
class AtomicHook<ReturnType (*)(Args...)> {
public:
using FnPtr = ReturnType (*)(Args...);
// Constructs an object that by default performs a no-op (and
// returns a default constructed object) when no hook as been registered.
constexpr AtomicHook() : AtomicHook(DummyFunction) {}
// Constructs an object that by default dispatches to/returns the
// pre-registered default_fn when no hook has been registered at runtime.
#if ABSL_HAVE_WORKING_ATOMIC_POINTER && ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
explicit constexpr AtomicHook(FnPtr default_fn)
: hook_(default_fn), default_fn_(default_fn) {}
#elif ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
explicit constexpr AtomicHook(FnPtr default_fn)
: hook_(kUninitialized), default_fn_(default_fn) {}
#else
// As of January 2020, on all known versions of MSVC this constructor runs in
// the global constructor sequence. If `Store()` is called by a dynamic
// initializer, we want to preserve the value, even if this constructor runs
// after the call to `Store()`. If not, `hook_` will be
// zero-initialized by the linker and we have no need to set it.
// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
explicit constexpr AtomicHook(FnPtr default_fn)
: /* hook_(deliberately omitted), */ default_fn_(default_fn) {
static_assert(kUninitialized == 0, "here we rely on zero-initialization");
}
#endif
// Stores the provided function pointer as the value for this hook.
//
// This is intended to be called once. Multiple calls are legal only if the
// same function pointer is provided for each call. The store is implemented
// as a memory_order_release operation, and read accesses are implemented as
// memory_order_acquire.
void Store(FnPtr fn) {
bool success = DoStore(fn);
static_cast<void>(success);
assert(success);
}
// Invokes the registered callback. If no callback has yet been registered, a
// default-constructed object of the appropriate type is returned instead.
template <typename... CallArgs>
ReturnType operator()(CallArgs&&... args) const {
return DoLoad()(std::forward<CallArgs>(args)...);
}
// Returns the registered callback, or nullptr if none has been registered.
// Useful if client code needs to conditionalize behavior based on whether a
// callback was registered.
//
// Note that atomic_hook.Load()() and atomic_hook() have different semantics:
// operator()() will perform a no-op if no callback was registered, while
// Load()() will dereference a null function pointer. Prefer operator()() to
// Load()() unless you must conditionalize behavior on whether a hook was
// registered.
FnPtr Load() const {
FnPtr ptr = DoLoad();
return (ptr == DummyFunction) ? nullptr : ptr;
}
private:
static ReturnType DummyFunction(Args...) {
return ReturnType();
}
// Current versions of MSVC (as of September 2017) have a broken
// implementation of std::atomic<T*>: Its constructor attempts to do the
// equivalent of a reinterpret_cast in a constexpr context, which is not
// allowed.
//
// This causes an issue when building with LLVM under Windows. To avoid this,
// we use a less-efficient, intptr_t-based implementation on Windows.
#if ABSL_HAVE_WORKING_ATOMIC_POINTER
// Return the stored value, or DummyFunction if no value has been stored.
FnPtr DoLoad() const { return hook_.load(std::memory_order_acquire); }
// Store the given value. Returns false if a different value was already
// stored to this object.
bool DoStore(FnPtr fn) {
assert(fn);
FnPtr expected = default_fn_;
const bool store_succeeded = hook_.compare_exchange_strong(
expected, fn, std::memory_order_acq_rel, std::memory_order_acquire);
const bool same_value_already_stored = (expected == fn);
return store_succeeded || same_value_already_stored;
}
std::atomic<FnPtr> hook_;
#else // !ABSL_HAVE_WORKING_ATOMIC_POINTER
// Use a sentinel value unlikely to be the address of an actual function.
static constexpr intptr_t kUninitialized = 0;
static_assert(sizeof(intptr_t) >= sizeof(FnPtr),
"intptr_t can't contain a function pointer");
FnPtr DoLoad() const {
const intptr_t value = hook_.load(std::memory_order_acquire);
if (value == kUninitialized) {
return default_fn_;
}
return reinterpret_cast<FnPtr>(value);
}
bool DoStore(FnPtr fn) {
assert(fn);
const auto value = reinterpret_cast<intptr_t>(fn);
intptr_t expected = kUninitialized;
const bool store_succeeded = hook_.compare_exchange_strong(
expected, value, std::memory_order_acq_rel, std::memory_order_acquire);
const bool same_value_already_stored = (expected == value);
return store_succeeded || same_value_already_stored;
}
std::atomic<intptr_t> hook_;
#endif
const FnPtr default_fn_;
};
#undef ABSL_HAVE_WORKING_ATOMIC_POINTER
#undef ABSL_HAVE_WORKING_CONSTEXPR_STATIC_INIT
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_ATOMIC_HOOK_H_

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/atomic_hook.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/attributes.h"
#include "absl/base/internal/atomic_hook_test_helper.h"
namespace {
using ::testing::Eq;
int value = 0;
void TestHook(int x) { value = x; }
TEST(AtomicHookTest, NoDefaultFunction) {
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
void (*)(int)>
hook;
value = 0;
// Test the default DummyFunction.
EXPECT_TRUE(hook.Load() == nullptr);
EXPECT_EQ(value, 0);
hook(1);
EXPECT_EQ(value, 0);
// Test a stored hook.
hook.Store(TestHook);
EXPECT_TRUE(hook.Load() == TestHook);
EXPECT_EQ(value, 0);
hook(1);
EXPECT_EQ(value, 1);
// Calling Store() with the same hook should not crash.
hook.Store(TestHook);
EXPECT_TRUE(hook.Load() == TestHook);
EXPECT_EQ(value, 1);
hook(2);
EXPECT_EQ(value, 2);
}
TEST(AtomicHookTest, WithDefaultFunction) {
// Set the default value to TestHook at compile-time.
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
void (*)(int)>
hook(TestHook);
value = 0;
// Test the default value is TestHook.
EXPECT_TRUE(hook.Load() == TestHook);
EXPECT_EQ(value, 0);
hook(1);
EXPECT_EQ(value, 1);
// Calling Store() with the same hook should not crash.
hook.Store(TestHook);
EXPECT_TRUE(hook.Load() == TestHook);
EXPECT_EQ(value, 1);
hook(2);
EXPECT_EQ(value, 2);
}
ABSL_CONST_INIT int override_func_calls = 0;
void OverrideFunc() { override_func_calls++; }
static struct OverrideInstaller {
OverrideInstaller() { absl::atomic_hook_internal::func.Store(OverrideFunc); }
} override_installer;
TEST(AtomicHookTest, DynamicInitFromAnotherTU) {
// MSVC 14.2 doesn't do constexpr static init correctly; in particular it
// tends to sequence static init (i.e. defaults) of `AtomicHook` objects
// after their dynamic init (i.e. overrides), overwriting whatever value was
// written during dynamic init. This regression test validates the fix.
// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
EXPECT_THAT(override_func_calls, Eq(0));
absl::atomic_hook_internal::func();
EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
EXPECT_THAT(override_func_calls, Eq(1));
EXPECT_THAT(absl::atomic_hook_internal::func.Load(), Eq(OverrideFunc));
}
} // namespace

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/atomic_hook_test_helper.h"
#include "absl/base/attributes.h"
#include "absl/base/internal/atomic_hook.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace atomic_hook_internal {
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES absl::base_internal::AtomicHook<VoidF>
func(DefaultFunc);
ABSL_CONST_INIT int default_func_calls = 0;
void DefaultFunc() { default_func_calls++; }
void RegisterFunc(VoidF f) { func.Store(f); }
} // namespace atomic_hook_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_ATOMIC_HOOK_TEST_HELPER_H_
#define ABSL_BASE_INTERNAL_ATOMIC_HOOK_TEST_HELPER_H_
#include "absl/base/internal/atomic_hook.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace atomic_hook_internal {
using VoidF = void (*)();
extern absl::base_internal::AtomicHook<VoidF> func;
extern int default_func_calls;
void DefaultFunc();
void RegisterFunc(VoidF func);
} // namespace atomic_hook_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_ATOMIC_HOOK_TEST_HELPER_H_

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include "absl/base/internal/thread_identity.h"
int main() {
auto* tid = absl::base_internal::CurrentThreadIdentityIfPresent();
// Make sure the above call can't be optimized out
std::cout << (void*)tid << std::endl;
}

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// The implementation of CycleClock::Frequency.
//
// NOTE: only i386 and x86_64 have been well tested.
// PPC, sparc, alpha, and ia64 are based on
// http://peter.kuscsik.com/wordpress/?p=14
// with modifications by m3b. See also
// https://setisvn.ssl.berkeley.edu/svn/lib/fftw-3.0.1/kernel/cycle.h
#include "absl/base/internal/cycleclock.h"
#include <atomic>
#include <chrono> // NOLINT(build/c++11)
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/unscaledcycleclock.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
#if ABSL_USE_UNSCALED_CYCLECLOCK
ABSL_CONST_INIT std::atomic<CycleClockSourceFunc>
CycleClock::cycle_clock_source_{nullptr};
void CycleClockSource::Register(CycleClockSourceFunc source) {
// Corresponds to the load(std::memory_order_acquire) in LoadCycleClockSource.
CycleClock::cycle_clock_source_.store(source, std::memory_order_release);
}
#ifdef _WIN32
int64_t CycleClock::Now() {
auto fn = LoadCycleClockSource();
if (fn == nullptr) {
return base_internal::UnscaledCycleClock::Now() >> kShift;
}
return fn() >> kShift;
}
#endif
#else
int64_t CycleClock::Now() {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::steady_clock::now().time_since_epoch())
.count();
}
double CycleClock::Frequency() {
return 1e9;
}
#endif
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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//
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: cycleclock.h
// -----------------------------------------------------------------------------
//
// This header file defines a `CycleClock`, which yields the value and frequency
// of a cycle counter that increments at a rate that is approximately constant.
//
// NOTE:
//
// The cycle counter frequency is not necessarily related to the core clock
// frequency and should not be treated as such. That is, `CycleClock` cycles are
// not necessarily "CPU cycles" and code should not rely on that behavior, even
// if experimentally observed.
//
// An arbitrary offset may have been added to the counter at power on.
//
// On some platforms, the rate and offset of the counter may differ
// slightly when read from different CPUs of a multiprocessor. Usually,
// we try to ensure that the operating system adjusts values periodically
// so that values agree approximately. If you need stronger guarantees,
// consider using alternate interfaces.
//
// The CPU is not required to maintain the ordering of a cycle counter read
// with respect to surrounding instructions.
#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_H_
#define ABSL_BASE_INTERNAL_CYCLECLOCK_H_
#include <atomic>
#include <cstdint>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/cycleclock_config.h"
#include "absl/base/internal/unscaledcycleclock.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
using CycleClockSourceFunc = int64_t (*)();
// -----------------------------------------------------------------------------
// CycleClock
// -----------------------------------------------------------------------------
class CycleClock {
public:
// CycleClock::Now()
//
// Returns the value of a cycle counter that counts at a rate that is
// approximately constant.
static int64_t Now();
// CycleClock::Frequency()
//
// Returns the amount by which `CycleClock::Now()` increases per second. Note
// that this value may not necessarily match the core CPU clock frequency.
static double Frequency();
private:
#if ABSL_USE_UNSCALED_CYCLECLOCK
static CycleClockSourceFunc LoadCycleClockSource();
static constexpr int32_t kShift = kCycleClockShift;
static constexpr double kFrequencyScale = kCycleClockFrequencyScale;
ABSL_CONST_INIT static std::atomic<CycleClockSourceFunc> cycle_clock_source_;
#endif // ABSL_USE_UNSCALED_CYCLECLOC
CycleClock() = delete; // no instances
CycleClock(const CycleClock&) = delete;
CycleClock& operator=(const CycleClock&) = delete;
friend class CycleClockSource;
};
class CycleClockSource {
private:
// CycleClockSource::Register()
//
// Register a function that provides an alternate source for the unscaled CPU
// cycle count value. The source function must be async signal safe, must not
// call CycleClock::Now(), and must have a frequency that matches that of the
// unscaled clock used by CycleClock. A nullptr value resets CycleClock to use
// the default source.
static void Register(CycleClockSourceFunc source);
};
#if ABSL_USE_UNSCALED_CYCLECLOCK
inline CycleClockSourceFunc CycleClock::LoadCycleClockSource() {
#if !defined(__x86_64__)
// Optimize for the common case (no callback) by first doing a relaxed load;
// this is significantly faster on non-x86 platforms.
if (cycle_clock_source_.load(std::memory_order_relaxed) == nullptr) {
return nullptr;
}
#endif // !defined(__x86_64__)
// This corresponds to the store(std::memory_order_release) in
// CycleClockSource::Register, and makes sure that any updates made prior to
// registering the callback are visible to this thread before the callback
// is invoked.
return cycle_clock_source_.load(std::memory_order_acquire);
}
// Accessing globals in inlined code in Window DLLs is problematic.
#ifndef _WIN32
inline int64_t CycleClock::Now() {
auto fn = LoadCycleClockSource();
if (fn == nullptr) {
return base_internal::UnscaledCycleClock::Now() >> kShift;
}
return fn() >> kShift;
}
#endif
inline double CycleClock::Frequency() {
return kFrequencyScale * base_internal::UnscaledCycleClock::Frequency();
}
#endif // ABSL_USE_UNSCALED_CYCLECLOCK
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_CYCLECLOCK_H_

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// Copyright 2022 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_
#define ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_
#include <cstdint>
#include "absl/base/config.h"
#include "absl/base/internal/unscaledcycleclock_config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
#if ABSL_USE_UNSCALED_CYCLECLOCK
#ifdef NDEBUG
#ifdef ABSL_INTERNAL_UNSCALED_CYCLECLOCK_FREQUENCY_IS_CPU_FREQUENCY
// Not debug mode and the UnscaledCycleClock frequency is the CPU
// frequency. Scale the CycleClock to prevent overflow if someone
// tries to represent the time as cycles since the Unix epoch.
inline constexpr int32_t kCycleClockShift = 1;
#else
// Not debug mode and the UnscaledCycleClock isn't operating at the
// raw CPU frequency. There is no need to do any scaling, so don't
// needlessly sacrifice precision.
inline constexpr int32_t kCycleClockShift = 0;
#endif
#else // NDEBUG
// In debug mode use a different shift to discourage depending on a
// particular shift value.
inline constexpr int32_t kCycleClockShift = 2;
#endif // NDEBUG
inline constexpr double kCycleClockFrequencyScale =
1.0 / (1 << kCycleClockShift);
#endif // ABSL_USE_UNSCALED_CYCLECLOCK
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_CYCLECLOCK_CONFIG_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Functions for directly invoking mmap() via syscall, avoiding the case where
// mmap() has been locally overridden.
#ifndef ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
#define ABSL_BASE_INTERNAL_DIRECT_MMAP_H_
#include "absl/base/config.h"
#ifdef ABSL_HAVE_MMAP
#include <sys/mman.h>
#ifdef __linux__
#include <sys/types.h>
#ifdef __BIONIC__
#include <sys/syscall.h>
#else
#include <syscall.h>
#endif
#include <linux/unistd.h>
#include <unistd.h>
#include <cerrno>
#include <cstdarg>
#include <cstdint>
#ifdef __mips__
// Include definitions of the ABI currently in use.
#if defined(__BIONIC__) || !defined(__GLIBC__)
// Android doesn't have sgidefs.h, but does have asm/sgidefs.h, which has the
// definitions we need.
#include <asm/sgidefs.h>
#else
#include <sgidefs.h>
#endif // __BIONIC__ || !__GLIBC__
#endif // __mips__
// SYS_mmap and SYS_munmap are not defined in Android.
#ifdef __BIONIC__
extern "C" void* __mmap2(void*, size_t, int, int, int, size_t);
#if defined(__NR_mmap) && !defined(SYS_mmap)
#define SYS_mmap __NR_mmap
#endif
#ifndef SYS_munmap
#define SYS_munmap __NR_munmap
#endif
#endif // __BIONIC__
#if defined(__NR_mmap2) && !defined(SYS_mmap2)
#define SYS_mmap2 __NR_mmap2
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// Platform specific logic extracted from
// https://chromium.googlesource.com/linux-syscall-support/+/master/linux_syscall_support.h
inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
off_t offset) noexcept {
#if defined(__i386__) || defined(__ARM_ARCH_3__) || defined(__ARM_EABI__) || \
defined(__m68k__) || defined(__sh__) || \
(defined(__hppa__) && !defined(__LP64__)) || \
(defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) || \
(defined(__PPC__) && !defined(__PPC64__)) || \
(defined(__riscv) && __riscv_xlen == 32) || \
(defined(__s390__) && !defined(__s390x__)) || \
(defined(__sparc__) && !defined(__arch64__))
// On these architectures, implement mmap with mmap2.
static int pagesize = 0;
if (pagesize == 0) {
#if defined(__wasm__) || defined(__asmjs__)
pagesize = getpagesize();
#else
pagesize = sysconf(_SC_PAGESIZE);
#endif
}
if (offset < 0 || offset % pagesize != 0) {
errno = EINVAL;
return MAP_FAILED;
}
#ifdef __BIONIC__
// SYS_mmap2 has problems on Android API level <= 16.
// Workaround by invoking __mmap2() instead.
return __mmap2(start, length, prot, flags, fd,
static_cast<size_t>(offset / pagesize));
#else
return reinterpret_cast<void*>(
syscall(SYS_mmap2, start, length, prot, flags, fd,
static_cast<unsigned long>(offset / pagesize))); // NOLINT
#endif
#elif defined(__s390x__)
// On s390x, mmap() arguments are passed in memory.
unsigned long buf[6] = {reinterpret_cast<unsigned long>(start), // NOLINT
static_cast<unsigned long>(length), // NOLINT
static_cast<unsigned long>(prot), // NOLINT
static_cast<unsigned long>(flags), // NOLINT
static_cast<unsigned long>(fd), // NOLINT
static_cast<unsigned long>(offset)}; // NOLINT
return reinterpret_cast<void*>(syscall(SYS_mmap, buf));
#elif defined(__x86_64__)
// The x32 ABI has 32 bit longs, but the syscall interface is 64 bit.
// We need to explicitly cast to an unsigned 64 bit type to avoid implicit
// sign extension. We can't cast pointers directly because those are
// 32 bits, and gcc will dump ugly warnings about casting from a pointer
// to an integer of a different size. We also need to make sure __off64_t
// isn't truncated to 32-bits under x32.
#define MMAP_SYSCALL_ARG(x) ((uint64_t)(uintptr_t)(x))
return reinterpret_cast<void*>(
syscall(SYS_mmap, MMAP_SYSCALL_ARG(start), MMAP_SYSCALL_ARG(length),
MMAP_SYSCALL_ARG(prot), MMAP_SYSCALL_ARG(flags),
MMAP_SYSCALL_ARG(fd), static_cast<uint64_t>(offset)));
#undef MMAP_SYSCALL_ARG
#else // Remaining 64-bit aritectures.
static_assert(sizeof(unsigned long) == 8, "Platform is not 64-bit");
return reinterpret_cast<void*>(
syscall(SYS_mmap, start, length, prot, flags, fd, offset));
#endif
}
inline int DirectMunmap(void* start, size_t length) {
return static_cast<int>(syscall(SYS_munmap, start, length));
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#else // !__linux__
// For non-linux platforms where we have mmap, just dispatch directly to the
// actual mmap()/munmap() methods.
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
inline void* DirectMmap(void* start, size_t length, int prot, int flags, int fd,
off_t offset) {
return mmap(start, length, prot, flags, fd, offset);
}
inline int DirectMunmap(void* start, size_t length) {
return munmap(start, length);
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // __linux__
#endif // ABSL_HAVE_MMAP
#endif // ABSL_BASE_INTERNAL_DIRECT_MMAP_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is for Abseil internal use only.
// See //absl/numeric/bits.h for supported functions related to endian-ness.
#ifndef ABSL_BASE_INTERNAL_ENDIAN_H_
#define ABSL_BASE_INTERNAL_ENDIAN_H_
#include <cstdint>
#include <cstdlib>
#include "absl/base/casts.h"
#include "absl/base/config.h"
#include "absl/base/internal/unaligned_access.h"
#include "absl/base/nullability.h"
#include "absl/base/port.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
constexpr uint64_t gbswap_64(uint64_t x) {
#if ABSL_HAVE_BUILTIN(__builtin_bswap64) || defined(__GNUC__)
return __builtin_bswap64(x);
#else
return (((x & uint64_t{0xFF}) << 56) |
((x & uint64_t{0xFF00}) << 40) |
((x & uint64_t{0xFF0000}) << 24) |
((x & uint64_t{0xFF000000}) << 8) |
((x & uint64_t{0xFF00000000}) >> 8) |
((x & uint64_t{0xFF0000000000}) >> 24) |
((x & uint64_t{0xFF000000000000}) >> 40) |
((x & uint64_t{0xFF00000000000000}) >> 56));
#endif
}
constexpr uint32_t gbswap_32(uint32_t x) {
#if ABSL_HAVE_BUILTIN(__builtin_bswap32) || defined(__GNUC__)
return __builtin_bswap32(x);
#else
return (((x & uint32_t{0xFF}) << 24) |
((x & uint32_t{0xFF00}) << 8) |
((x & uint32_t{0xFF0000}) >> 8) |
((x & uint32_t{0xFF000000}) >> 24));
#endif
}
constexpr uint16_t gbswap_16(uint16_t x) {
#if ABSL_HAVE_BUILTIN(__builtin_bswap16) || defined(__GNUC__)
return __builtin_bswap16(x);
#else
return (((x & uint16_t{0xFF}) << 8) |
((x & uint16_t{0xFF00}) >> 8));
#endif
}
#ifdef ABSL_IS_LITTLE_ENDIAN
// Portable definitions for htonl (host-to-network) and friends on little-endian
// architectures.
inline uint16_t ghtons(uint16_t x) { return gbswap_16(x); }
inline uint32_t ghtonl(uint32_t x) { return gbswap_32(x); }
inline uint64_t ghtonll(uint64_t x) { return gbswap_64(x); }
#elif defined ABSL_IS_BIG_ENDIAN
// Portable definitions for htonl (host-to-network) etc on big-endian
// architectures. These definitions are simpler since the host byte order is the
// same as network byte order.
inline uint16_t ghtons(uint16_t x) { return x; }
inline uint32_t ghtonl(uint32_t x) { return x; }
inline uint64_t ghtonll(uint64_t x) { return x; }
#else
#error \
"Unsupported byte order: Either ABSL_IS_BIG_ENDIAN or " \
"ABSL_IS_LITTLE_ENDIAN must be defined"
#endif // byte order
inline uint16_t gntohs(uint16_t x) { return ghtons(x); }
inline uint32_t gntohl(uint32_t x) { return ghtonl(x); }
inline uint64_t gntohll(uint64_t x) { return ghtonll(x); }
// Utilities to convert numbers between the current hosts's native byte
// order and little-endian byte order
//
// Load/Store methods are alignment safe
namespace little_endian {
// Conversion functions.
#ifdef ABSL_IS_LITTLE_ENDIAN
inline uint16_t FromHost16(uint16_t x) { return x; }
inline uint16_t ToHost16(uint16_t x) { return x; }
inline uint32_t FromHost32(uint32_t x) { return x; }
inline uint32_t ToHost32(uint32_t x) { return x; }
inline uint64_t FromHost64(uint64_t x) { return x; }
inline uint64_t ToHost64(uint64_t x) { return x; }
inline constexpr bool IsLittleEndian() { return true; }
#elif defined ABSL_IS_BIG_ENDIAN
inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
inline constexpr bool IsLittleEndian() { return false; }
#endif /* ENDIAN */
inline uint8_t FromHost(uint8_t x) { return x; }
inline uint16_t FromHost(uint16_t x) { return FromHost16(x); }
inline uint32_t FromHost(uint32_t x) { return FromHost32(x); }
inline uint64_t FromHost(uint64_t x) { return FromHost64(x); }
inline uint8_t ToHost(uint8_t x) { return x; }
inline uint16_t ToHost(uint16_t x) { return ToHost16(x); }
inline uint32_t ToHost(uint32_t x) { return ToHost32(x); }
inline uint64_t ToHost(uint64_t x) { return ToHost64(x); }
inline int8_t FromHost(int8_t x) { return x; }
inline int16_t FromHost(int16_t x) {
return bit_cast<int16_t>(FromHost16(bit_cast<uint16_t>(x)));
}
inline int32_t FromHost(int32_t x) {
return bit_cast<int32_t>(FromHost32(bit_cast<uint32_t>(x)));
}
inline int64_t FromHost(int64_t x) {
return bit_cast<int64_t>(FromHost64(bit_cast<uint64_t>(x)));
}
inline int8_t ToHost(int8_t x) { return x; }
inline int16_t ToHost(int16_t x) {
return bit_cast<int16_t>(ToHost16(bit_cast<uint16_t>(x)));
}
inline int32_t ToHost(int32_t x) {
return bit_cast<int32_t>(ToHost32(bit_cast<uint32_t>(x)));
}
inline int64_t ToHost(int64_t x) {
return bit_cast<int64_t>(ToHost64(bit_cast<uint64_t>(x)));
}
// Functions to do unaligned loads and stores in little-endian order.
inline uint16_t Load16(absl::Nonnull<const void *> p) {
return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
}
inline void Store16(absl::Nonnull<void *> p, uint16_t v) {
ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
}
inline uint32_t Load32(absl::Nonnull<const void *> p) {
return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
}
inline void Store32(absl::Nonnull<void *> p, uint32_t v) {
ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
}
inline uint64_t Load64(absl::Nonnull<const void *> p) {
return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
}
inline void Store64(absl::Nonnull<void *> p, uint64_t v) {
ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
}
} // namespace little_endian
// Utilities to convert numbers between the current hosts's native byte
// order and big-endian byte order (same as network byte order)
//
// Load/Store methods are alignment safe
namespace big_endian {
#ifdef ABSL_IS_LITTLE_ENDIAN
inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
inline constexpr bool IsLittleEndian() { return true; }
#elif defined ABSL_IS_BIG_ENDIAN
inline uint16_t FromHost16(uint16_t x) { return x; }
inline uint16_t ToHost16(uint16_t x) { return x; }
inline uint32_t FromHost32(uint32_t x) { return x; }
inline uint32_t ToHost32(uint32_t x) { return x; }
inline uint64_t FromHost64(uint64_t x) { return x; }
inline uint64_t ToHost64(uint64_t x) { return x; }
inline constexpr bool IsLittleEndian() { return false; }
#endif /* ENDIAN */
inline uint8_t FromHost(uint8_t x) { return x; }
inline uint16_t FromHost(uint16_t x) { return FromHost16(x); }
inline uint32_t FromHost(uint32_t x) { return FromHost32(x); }
inline uint64_t FromHost(uint64_t x) { return FromHost64(x); }
inline uint8_t ToHost(uint8_t x) { return x; }
inline uint16_t ToHost(uint16_t x) { return ToHost16(x); }
inline uint32_t ToHost(uint32_t x) { return ToHost32(x); }
inline uint64_t ToHost(uint64_t x) { return ToHost64(x); }
inline int8_t FromHost(int8_t x) { return x; }
inline int16_t FromHost(int16_t x) {
return bit_cast<int16_t>(FromHost16(bit_cast<uint16_t>(x)));
}
inline int32_t FromHost(int32_t x) {
return bit_cast<int32_t>(FromHost32(bit_cast<uint32_t>(x)));
}
inline int64_t FromHost(int64_t x) {
return bit_cast<int64_t>(FromHost64(bit_cast<uint64_t>(x)));
}
inline int8_t ToHost(int8_t x) { return x; }
inline int16_t ToHost(int16_t x) {
return bit_cast<int16_t>(ToHost16(bit_cast<uint16_t>(x)));
}
inline int32_t ToHost(int32_t x) {
return bit_cast<int32_t>(ToHost32(bit_cast<uint32_t>(x)));
}
inline int64_t ToHost(int64_t x) {
return bit_cast<int64_t>(ToHost64(bit_cast<uint64_t>(x)));
}
// Functions to do unaligned loads and stores in big-endian order.
inline uint16_t Load16(absl::Nonnull<const void *> p) {
return ToHost16(ABSL_INTERNAL_UNALIGNED_LOAD16(p));
}
inline void Store16(absl::Nonnull<void *> p, uint16_t v) {
ABSL_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
}
inline uint32_t Load32(absl::Nonnull<const void *> p) {
return ToHost32(ABSL_INTERNAL_UNALIGNED_LOAD32(p));
}
inline void Store32(absl::Nonnull<void *>p, uint32_t v) {
ABSL_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
}
inline uint64_t Load64(absl::Nonnull<const void *> p) {
return ToHost64(ABSL_INTERNAL_UNALIGNED_LOAD64(p));
}
inline void Store64(absl::Nonnull<void *> p, uint64_t v) {
ABSL_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
}
} // namespace big_endian
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_ENDIAN_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/endian.h"
#include <algorithm>
#include <cstdint>
#include <limits>
#include <random>
#include <vector>
#include "gtest/gtest.h"
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
const uint64_t kInitialNumber{0x0123456789abcdef};
const uint64_t k64Value{kInitialNumber};
const uint32_t k32Value{0x01234567};
const uint16_t k16Value{0x0123};
const int kNumValuesToTest = 1000000;
const int kRandomSeed = 12345;
#if defined(ABSL_IS_BIG_ENDIAN)
const uint64_t kInitialInNetworkOrder{kInitialNumber};
const uint64_t k64ValueLE{0xefcdab8967452301};
const uint32_t k32ValueLE{0x67452301};
const uint16_t k16ValueLE{0x2301};
const uint64_t k64ValueBE{kInitialNumber};
const uint32_t k32ValueBE{k32Value};
const uint16_t k16ValueBE{k16Value};
#elif defined(ABSL_IS_LITTLE_ENDIAN)
const uint64_t kInitialInNetworkOrder{0xefcdab8967452301};
const uint64_t k64ValueLE{kInitialNumber};
const uint32_t k32ValueLE{k32Value};
const uint16_t k16ValueLE{k16Value};
const uint64_t k64ValueBE{0xefcdab8967452301};
const uint32_t k32ValueBE{0x67452301};
const uint16_t k16ValueBE{0x2301};
#endif
std::vector<uint16_t> GenerateAllUint16Values() {
std::vector<uint16_t> result;
result.reserve(size_t{1} << (sizeof(uint16_t) * 8));
for (uint32_t i = std::numeric_limits<uint16_t>::min();
i <= std::numeric_limits<uint16_t>::max(); ++i) {
result.push_back(static_cast<uint16_t>(i));
}
return result;
}
template<typename T>
std::vector<T> GenerateRandomIntegers(size_t num_values_to_test) {
std::vector<T> result;
result.reserve(num_values_to_test);
std::mt19937_64 rng(kRandomSeed);
for (size_t i = 0; i < num_values_to_test; ++i) {
result.push_back(rng());
}
return result;
}
void ManualByteSwap(char* bytes, int length) {
if (length == 1)
return;
EXPECT_EQ(0, length % 2);
for (int i = 0; i < length / 2; ++i) {
int j = (length - 1) - i;
using std::swap;
swap(bytes[i], bytes[j]);
}
}
template<typename T>
inline T UnalignedLoad(const char* p) {
static_assert(
sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8,
"Unexpected type size");
switch (sizeof(T)) {
case 1: return *reinterpret_cast<const T*>(p);
case 2:
return ABSL_INTERNAL_UNALIGNED_LOAD16(p);
case 4:
return ABSL_INTERNAL_UNALIGNED_LOAD32(p);
case 8:
return ABSL_INTERNAL_UNALIGNED_LOAD64(p);
default:
// Suppresses invalid "not all control paths return a value" on MSVC
return {};
}
}
template <typename T, typename ByteSwapper>
static void GBSwapHelper(const std::vector<T>& host_values_to_test,
const ByteSwapper& byte_swapper) {
// Test byte_swapper against a manual byte swap.
for (typename std::vector<T>::const_iterator it = host_values_to_test.begin();
it != host_values_to_test.end(); ++it) {
T host_value = *it;
char actual_value[sizeof(host_value)];
memcpy(actual_value, &host_value, sizeof(host_value));
byte_swapper(actual_value);
char expected_value[sizeof(host_value)];
memcpy(expected_value, &host_value, sizeof(host_value));
ManualByteSwap(expected_value, sizeof(host_value));
ASSERT_EQ(0, memcmp(actual_value, expected_value, sizeof(host_value)))
<< "Swap output for 0x" << std::hex << host_value << " does not match. "
<< "Expected: 0x" << UnalignedLoad<T>(expected_value) << "; "
<< "actual: 0x" << UnalignedLoad<T>(actual_value);
}
}
void Swap16(char* bytes) {
ABSL_INTERNAL_UNALIGNED_STORE16(
bytes, gbswap_16(ABSL_INTERNAL_UNALIGNED_LOAD16(bytes)));
}
void Swap32(char* bytes) {
ABSL_INTERNAL_UNALIGNED_STORE32(
bytes, gbswap_32(ABSL_INTERNAL_UNALIGNED_LOAD32(bytes)));
}
void Swap64(char* bytes) {
ABSL_INTERNAL_UNALIGNED_STORE64(
bytes, gbswap_64(ABSL_INTERNAL_UNALIGNED_LOAD64(bytes)));
}
TEST(EndianessTest, Uint16) {
GBSwapHelper(GenerateAllUint16Values(), &Swap16);
}
TEST(EndianessTest, Uint32) {
GBSwapHelper(GenerateRandomIntegers<uint32_t>(kNumValuesToTest), &Swap32);
}
TEST(EndianessTest, Uint64) {
GBSwapHelper(GenerateRandomIntegers<uint64_t>(kNumValuesToTest), &Swap64);
}
TEST(EndianessTest, ghtonll_gntohll) {
// Test that absl::ghtonl compiles correctly
uint32_t test = 0x01234567;
EXPECT_EQ(absl::gntohl(absl::ghtonl(test)), test);
uint64_t comp = absl::ghtonll(kInitialNumber);
EXPECT_EQ(comp, kInitialInNetworkOrder);
comp = absl::gntohll(kInitialInNetworkOrder);
EXPECT_EQ(comp, kInitialNumber);
// Test that htonll and ntohll are each others' inverse functions on a
// somewhat assorted batch of numbers. 37 is chosen to not be anything
// particularly nice base 2.
uint64_t value = 1;
for (int i = 0; i < 100; ++i) {
comp = absl::ghtonll(absl::gntohll(value));
EXPECT_EQ(value, comp);
comp = absl::gntohll(absl::ghtonll(value));
EXPECT_EQ(value, comp);
value *= 37;
}
}
TEST(EndianessTest, little_endian) {
// Check little_endian uint16_t.
uint64_t comp = little_endian::FromHost16(k16Value);
EXPECT_EQ(comp, k16ValueLE);
comp = little_endian::ToHost16(k16ValueLE);
EXPECT_EQ(comp, k16Value);
// Check little_endian uint32_t.
comp = little_endian::FromHost32(k32Value);
EXPECT_EQ(comp, k32ValueLE);
comp = little_endian::ToHost32(k32ValueLE);
EXPECT_EQ(comp, k32Value);
// Check little_endian uint64_t.
comp = little_endian::FromHost64(k64Value);
EXPECT_EQ(comp, k64ValueLE);
comp = little_endian::ToHost64(k64ValueLE);
EXPECT_EQ(comp, k64Value);
// Check little-endian Load and store functions.
uint16_t u16Buf;
uint32_t u32Buf;
uint64_t u64Buf;
little_endian::Store16(&u16Buf, k16Value);
EXPECT_EQ(u16Buf, k16ValueLE);
comp = little_endian::Load16(&u16Buf);
EXPECT_EQ(comp, k16Value);
little_endian::Store32(&u32Buf, k32Value);
EXPECT_EQ(u32Buf, k32ValueLE);
comp = little_endian::Load32(&u32Buf);
EXPECT_EQ(comp, k32Value);
little_endian::Store64(&u64Buf, k64Value);
EXPECT_EQ(u64Buf, k64ValueLE);
comp = little_endian::Load64(&u64Buf);
EXPECT_EQ(comp, k64Value);
}
TEST(EndianessTest, big_endian) {
// Check big-endian Load and store functions.
uint16_t u16Buf;
uint32_t u32Buf;
uint64_t u64Buf;
unsigned char buffer[10];
big_endian::Store16(&u16Buf, k16Value);
EXPECT_EQ(u16Buf, k16ValueBE);
uint64_t comp = big_endian::Load16(&u16Buf);
EXPECT_EQ(comp, k16Value);
big_endian::Store32(&u32Buf, k32Value);
EXPECT_EQ(u32Buf, k32ValueBE);
comp = big_endian::Load32(&u32Buf);
EXPECT_EQ(comp, k32Value);
big_endian::Store64(&u64Buf, k64Value);
EXPECT_EQ(u64Buf, k64ValueBE);
comp = big_endian::Load64(&u64Buf);
EXPECT_EQ(comp, k64Value);
big_endian::Store16(buffer + 1, k16Value);
EXPECT_EQ(u16Buf, k16ValueBE);
comp = big_endian::Load16(buffer + 1);
EXPECT_EQ(comp, k16Value);
big_endian::Store32(buffer + 1, k32Value);
EXPECT_EQ(u32Buf, k32ValueBE);
comp = big_endian::Load32(buffer + 1);
EXPECT_EQ(comp, k32Value);
big_endian::Store64(buffer + 1, k64Value);
EXPECT_EQ(u64Buf, k64ValueBE);
comp = big_endian::Load64(buffer + 1);
EXPECT_EQ(comp, k64Value);
}
} // namespace
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
#define ABSL_BASE_INTERNAL_ERRNO_SAVER_H_
#include <cerrno>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// `ErrnoSaver` captures the value of `errno` upon construction and restores it
// upon deletion. It is used in low-level code and must be super fast. Do not
// add instrumentation, even in debug modes.
class ErrnoSaver {
public:
ErrnoSaver() : saved_errno_(errno) {}
~ErrnoSaver() { errno = saved_errno_; }
int operator()() const { return saved_errno_; }
private:
const int saved_errno_;
};
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_ERRNO_SAVER_H_

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/errno_saver.h"
#include <cerrno>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/internal/strerror.h"
namespace {
using ::testing::Eq;
struct ErrnoPrinter {
int no;
};
std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) {
return os << absl::base_internal::StrError(ep.no) << " [" << ep.no << "]";
}
bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; }
TEST(ErrnoSaverTest, Works) {
errno = EDOM;
{
absl::base_internal::ErrnoSaver errno_saver;
EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
errno = ERANGE;
EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE}));
EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM}));
}
EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));
}
} // namespace

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/exception_safety_testing.h"
#ifdef ABSL_HAVE_EXCEPTIONS
#include "gtest/gtest.h"
#include "absl/meta/type_traits.h"
namespace testing {
exceptions_internal::NoThrowTag nothrow_ctor;
exceptions_internal::StrongGuaranteeTagType strong_guarantee;
exceptions_internal::ExceptionSafetyTestBuilder<> MakeExceptionSafetyTester() {
return {};
}
namespace exceptions_internal {
int countdown = -1;
ConstructorTracker* ConstructorTracker::current_tracker_instance_ = nullptr;
void MaybeThrow(absl::string_view msg, bool throw_bad_alloc) {
if (countdown-- == 0) {
if (throw_bad_alloc) throw TestBadAllocException(msg);
throw TestException(msg);
}
}
testing::AssertionResult FailureMessage(const TestException& e,
int countdown) noexcept {
return testing::AssertionFailure() << "Exception thrown from " << e.what();
}
std::string GetSpecString(TypeSpec spec) {
std::string out;
absl::string_view sep;
const auto append = [&](absl::string_view s) {
absl::StrAppend(&out, sep, s);
sep = " | ";
};
if (static_cast<bool>(TypeSpec::kNoThrowCopy & spec)) {
append("kNoThrowCopy");
}
if (static_cast<bool>(TypeSpec::kNoThrowMove & spec)) {
append("kNoThrowMove");
}
if (static_cast<bool>(TypeSpec::kNoThrowNew & spec)) {
append("kNoThrowNew");
}
return out;
}
std::string GetSpecString(AllocSpec spec) {
return static_cast<bool>(AllocSpec::kNoThrowAllocate & spec)
? "kNoThrowAllocate"
: "";
}
} // namespace exceptions_internal
} // namespace testing
#endif // ABSL_HAVE_EXCEPTIONS

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Testing utilities for ABSL types which throw exceptions.
#ifndef ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
#define ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_
#include "gtest/gtest.h"
#include "absl/base/config.h"
// ABSL_BASE_INTERNAL_EXPECT_FAIL tests either for a specified thrown exception
// if exceptions are enabled, or for death with a specified text in the error
// message
#ifdef ABSL_HAVE_EXCEPTIONS
#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
EXPECT_THROW(expr, exception_t)
#elif defined(__ANDROID__)
// Android asserts do not log anywhere that gtest can currently inspect.
// So we expect exit, but cannot match the message.
#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
EXPECT_DEATH(expr, ".*")
#else
#define ABSL_BASE_INTERNAL_EXPECT_FAIL(expr, exception_t, text) \
EXPECT_DEATH_IF_SUPPORTED(expr, text)
#endif
#endif // ABSL_BASE_INTERNAL_EXCEPTION_TESTING_H_

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//
// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
#define ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
template <typename Type>
struct FastTypeTag {
constexpr static char dummy_var = 0;
};
// FastTypeId<Type>() evaluates at compile/link-time to a unique pointer for the
// passed-in type. These are meant to be good match for keys into maps or
// straight up comparisons.
using FastTypeIdType = const void*;
template <typename Type>
constexpr inline FastTypeIdType FastTypeId() {
return &FastTypeTag<Type>::dummy_var;
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_FAST_TYPE_ID_H_

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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/fast_type_id.h"
#include <cstdint>
#include <map>
#include <vector>
#include "gtest/gtest.h"
namespace {
namespace bi = absl::base_internal;
// NOLINTNEXTLINE
#define PRIM_TYPES(A) \
A(bool) \
A(short) \
A(unsigned short) \
A(int) \
A(unsigned int) \
A(long) \
A(unsigned long) \
A(long long) \
A(unsigned long long) \
A(float) \
A(double) \
A(long double)
TEST(FastTypeIdTest, PrimitiveTypes) {
bi::FastTypeIdType type_ids[] = {
#define A(T) bi::FastTypeId<T>(),
PRIM_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<const T>(),
PRIM_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<volatile T>(),
PRIM_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<const volatile T>(),
PRIM_TYPES(A)
#undef A
};
size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
for (int i = 0; i < total_type_ids; ++i) {
EXPECT_EQ(type_ids[i], type_ids[i]);
for (int j = 0; j < i; ++j) {
EXPECT_NE(type_ids[i], type_ids[j]);
}
}
}
#define FIXED_WIDTH_TYPES(A) \
A(int8_t) \
A(uint8_t) \
A(int16_t) \
A(uint16_t) \
A(int32_t) \
A(uint32_t) \
A(int64_t) \
A(uint64_t)
TEST(FastTypeIdTest, FixedWidthTypes) {
bi::FastTypeIdType type_ids[] = {
#define A(T) bi::FastTypeId<T>(),
FIXED_WIDTH_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<const T>(),
FIXED_WIDTH_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<volatile T>(),
FIXED_WIDTH_TYPES(A)
#undef A
#define A(T) bi::FastTypeId<const volatile T>(),
FIXED_WIDTH_TYPES(A)
#undef A
};
size_t total_type_ids = sizeof(type_ids) / sizeof(bi::FastTypeIdType);
for (int i = 0; i < total_type_ids; ++i) {
EXPECT_EQ(type_ids[i], type_ids[i]);
for (int j = 0; j < i; ++j) {
EXPECT_NE(type_ids[i], type_ids[j]);
}
}
}
TEST(FastTypeIdTest, AliasTypes) {
using int_alias = int;
EXPECT_EQ(bi::FastTypeId<int_alias>(), bi::FastTypeId<int>());
}
TEST(FastTypeIdTest, TemplateSpecializations) {
EXPECT_NE(bi::FastTypeId<std::vector<int>>(),
bi::FastTypeId<std::vector<long>>());
EXPECT_NE((bi::FastTypeId<std::map<int, float>>()),
(bi::FastTypeId<std::map<int, double>>()));
}
struct Base {};
struct Derived : Base {};
struct PDerived : private Base {};
TEST(FastTypeIdTest, Inheritance) {
EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<Derived>());
EXPECT_NE(bi::FastTypeId<Base>(), bi::FastTypeId<PDerived>());
}
} // namespace

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_HIDE_PTR_H_
#define ABSL_BASE_INTERNAL_HIDE_PTR_H_
#include <cstdint>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// Arbitrary value with high bits set. Xor'ing with it is unlikely
// to map one valid pointer to another valid pointer.
constexpr uintptr_t HideMask() {
return (uintptr_t{0xF03A5F7BU} << (sizeof(uintptr_t) - 4) * 8) | 0xF03A5F7BU;
}
// Hide a pointer from the leak checker. For internal use only.
// Differs from absl::IgnoreLeak(ptr) in that absl::IgnoreLeak(ptr) causes ptr
// and all objects reachable from ptr to be ignored by the leak checker.
template <class T>
inline uintptr_t HidePtr(T* ptr) {
return reinterpret_cast<uintptr_t>(ptr) ^ HideMask();
}
// Return a pointer that has been hidden from the leak checker.
// For internal use only.
template <class T>
inline T* UnhidePtr(uintptr_t hidden) {
return reinterpret_cast<T*>(hidden ^ HideMask());
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_HIDE_PTR_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef ABSL_BASE_INTERNAL_IDENTITY_H_
#define ABSL_BASE_INTERNAL_IDENTITY_H_
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace internal {
// This is a back-fill of C++20's `std::type_identity`.
template <typename T>
struct type_identity {
typedef T type;
};
// This is a back-fill of C++20's `std::type_identity_t`.
template <typename T>
using type_identity_t = typename type_identity<T>::type;
} // namespace internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_IDENTITY_H_

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// Copyright 2025 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: internal/iterator_traits.h
// -----------------------------------------------------------------------------
//
// Helpers for querying traits of iterators, for implementing containers, etc.
#ifndef ABSL_BASE_INTERNAL_ITERATOR_TRAITS_H_
#define ABSL_BASE_INTERNAL_ITERATOR_TRAITS_H_
#include <iterator>
#include <type_traits>
#include "absl/base/config.h"
#include "absl/meta/type_traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
template <typename Iterator, typename = void>
struct IteratorCategory {};
template <typename Iterator>
struct IteratorCategory<
Iterator,
absl::void_t<typename std::iterator_traits<Iterator>::iterator_category>> {
using type = typename std::iterator_traits<Iterator>::iterator_category;
};
template <typename Iterator, typename = void>
struct IteratorConceptImpl : IteratorCategory<Iterator> {};
template <typename Iterator>
struct IteratorConceptImpl<
Iterator,
absl::void_t<typename std::iterator_traits<Iterator>::iterator_concept>> {
using type = typename std::iterator_traits<Iterator>::iterator_concept;
};
// The newer `std::iterator_traits<Iterator>::iterator_concept` if available,
// else `std::iterator_traits<Iterator>::iterator_category`.
template <typename Iterator>
using IteratorConcept = typename IteratorConceptImpl<Iterator>::type;
template <typename IteratorTag, typename Iterator>
using IsAtLeastIterator =
std::is_convertible<IteratorConcept<Iterator>, IteratorTag>;
template <typename Iterator>
using IsAtLeastForwardIterator =
IsAtLeastIterator<std::forward_iterator_tag, Iterator>;
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_ITERATOR_TRAITS_H_

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// Copyright 2025 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/iterator_traits.h"
#include <forward_list>
#include <iterator>
#include <list>
#include <vector>
#include "gtest/gtest.h"
#include "absl/base/config.h"
#include "absl/base/internal/iterator_traits_test_helper.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
TEST(IsAtLeastIteratorTest, IsAtLeastIterator) {
EXPECT_TRUE((IsAtLeastIterator<std::input_iterator_tag, int*>()));
EXPECT_TRUE((IsAtLeastIterator<std::forward_iterator_tag, int*>()));
EXPECT_TRUE((IsAtLeastIterator<std::bidirectional_iterator_tag, int*>()));
EXPECT_TRUE((IsAtLeastIterator<std::random_access_iterator_tag, int*>()));
EXPECT_TRUE((IsAtLeastIterator<std::input_iterator_tag,
std::vector<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::forward_iterator_tag,
std::vector<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::bidirectional_iterator_tag,
std::vector<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::random_access_iterator_tag,
std::vector<int>::iterator>()));
EXPECT_TRUE(
(IsAtLeastIterator<std::input_iterator_tag, std::list<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::forward_iterator_tag,
std::list<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::bidirectional_iterator_tag,
std::list<int>::iterator>()));
EXPECT_FALSE((IsAtLeastIterator<std::random_access_iterator_tag,
std::list<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::input_iterator_tag,
std::forward_list<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::forward_iterator_tag,
std::forward_list<int>::iterator>()));
EXPECT_FALSE((IsAtLeastIterator<std::bidirectional_iterator_tag,
std::forward_list<int>::iterator>()));
EXPECT_FALSE((IsAtLeastIterator<std::random_access_iterator_tag,
std::forward_list<int>::iterator>()));
EXPECT_TRUE((IsAtLeastIterator<std::input_iterator_tag,
std::istream_iterator<int>>()));
EXPECT_FALSE((IsAtLeastIterator<std::forward_iterator_tag,
std::istream_iterator<int>>()));
EXPECT_FALSE((IsAtLeastIterator<std::bidirectional_iterator_tag,
std::istream_iterator<int>>()));
EXPECT_FALSE((IsAtLeastIterator<std::random_access_iterator_tag,
std::istream_iterator<int>>()));
EXPECT_TRUE((IsAtLeastIterator<std::input_iterator_tag,
Cpp20ForwardZipIterator<int*>>()));
EXPECT_TRUE((IsAtLeastIterator<std::forward_iterator_tag,
Cpp20ForwardZipIterator<int*>>()));
EXPECT_FALSE((IsAtLeastIterator<std::bidirectional_iterator_tag,
Cpp20ForwardZipIterator<int*>>()));
EXPECT_FALSE((IsAtLeastIterator<std::random_access_iterator_tag,
Cpp20ForwardZipIterator<int*>>()));
}
} // namespace
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2025 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_ITERATOR_TRAITS_TEST_HELPER_H_
#define ABSL_BASE_INTERNAL_ITERATOR_TRAITS_TEST_HELPER_H_
#include <iterator>
#include <utility>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// This would be a forward_iterator in C++20, but it's only an input iterator
// before that, since it has a non-reference `reference`.
template <typename Iterator>
class Cpp20ForwardZipIterator {
using IteratorReference = typename std::iterator_traits<Iterator>::reference;
public:
Cpp20ForwardZipIterator() = default;
explicit Cpp20ForwardZipIterator(Iterator left, Iterator right)
: left_(left), right_(right) {}
Cpp20ForwardZipIterator& operator++() {
++left_;
++right_;
return *this;
}
Cpp20ForwardZipIterator operator++(int) {
Cpp20ForwardZipIterator tmp(*this);
++*this;
return *this;
}
std::pair<IteratorReference, IteratorReference> operator*() const {
return {*left_, *right_};
}
// C++17 input iterators require `operator->`, but this isn't possible to
// implement. C++20 dropped the requirement.
friend bool operator==(const Cpp20ForwardZipIterator& lhs,
const Cpp20ForwardZipIterator& rhs) {
return lhs.left_ == rhs.left_ && lhs.right_ == rhs.right_;
}
friend bool operator!=(const Cpp20ForwardZipIterator& lhs,
const Cpp20ForwardZipIterator& rhs) {
return !(lhs == rhs);
}
private:
Iterator left_{};
Iterator right_{};
};
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
template <typename Iterator>
struct std::iterator_traits<
absl::base_internal::Cpp20ForwardZipIterator<Iterator>> {
private:
using IteratorReference = typename std::iterator_traits<Iterator>::reference;
public:
using iterator_category = std::input_iterator_tag;
using iterator_concept = std::forward_iterator_tag;
using value_type = std::pair<IteratorReference, IteratorReference>;
using difference_type =
typename std::iterator_traits<Iterator>::difference_type;
using reference = value_type;
using pointer = void;
};
#if defined(__cpp_lib_concepts)
static_assert(
std::forward_iterator<absl::base_internal::Cpp20ForwardZipIterator<int*>>);
#endif // defined(__cpp_lib_concepts)
#endif // ABSL_BASE_INTERNAL_ITERATOR_TRAITS_TEST_HELPER_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// A low-level allocator that can be used by other low-level
// modules without introducing dependency cycles.
// This allocator is slow and wasteful of memory;
// it should not be used when performance is key.
#include "absl/base/internal/low_level_alloc.h"
#include <type_traits>
#include "absl/base/call_once.h"
#include "absl/base/config.h"
#include "absl/base/internal/direct_mmap.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/macros.h"
#include "absl/base/thread_annotations.h"
// LowLevelAlloc requires that the platform support low-level
// allocation of virtual memory. Platforms lacking this cannot use
// LowLevelAlloc.
#ifndef ABSL_LOW_LEVEL_ALLOC_MISSING
#ifndef _WIN32
#include <pthread.h>
#include <signal.h>
#include <sys/mman.h>
#include <unistd.h>
#else
#include <windows.h>
#endif
#ifdef __linux__
#include <sys/prctl.h>
#endif
#include <string.h>
#include <algorithm>
#include <atomic>
#include <cerrno>
#include <cstddef>
#include <new> // for placement-new
#include "absl/base/dynamic_annotations.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/spinlock.h"
#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
#define MAP_ANONYMOUS MAP_ANON
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// A first-fit allocator with amortized logarithmic free() time.
// ---------------------------------------------------------------------------
static const int kMaxLevel = 30;
namespace {
// This struct describes one allocated block, or one free block.
struct AllocList {
struct Header {
// Size of entire region, including this field. Must be
// first. Valid in both allocated and unallocated blocks.
uintptr_t size;
// kMagicAllocated or kMagicUnallocated xor this.
uintptr_t magic;
// Pointer to parent arena.
LowLevelAlloc::Arena *arena;
// Aligns regions to 0 mod 2*sizeof(void*).
void *dummy_for_alignment;
} header;
// Next two fields: in unallocated blocks: freelist skiplist data
// in allocated blocks: overlaps with client data
// Levels in skiplist used.
int levels;
// Actually has levels elements. The AllocList node may not have room
// for all kMaxLevel entries. See max_fit in LLA_SkiplistLevels().
AllocList *next[kMaxLevel];
};
} // namespace
// ---------------------------------------------------------------------------
// A trivial skiplist implementation. This is used to keep the freelist
// in address order while taking only logarithmic time per insert and delete.
// An integer approximation of log2(size/base)
// Requires size >= base.
static int IntLog2(size_t size, size_t base) {
int result = 0;
for (size_t i = size; i > base; i >>= 1) { // i == floor(size/2**result)
result++;
}
// floor(size / 2**result) <= base < floor(size / 2**(result-1))
// => log2(size/(base+1)) <= result < 1+log2(size/base)
// => result ~= log2(size/base)
return result;
}
// Return a random integer n: p(n)=1/(2**n) if 1 <= n; p(n)=0 if n < 1.
static int Random(uint32_t *state) {
uint32_t r = *state;
int result = 1;
while ((((r = r * 1103515245 + 12345) >> 30) & 1) == 0) {
result++;
}
*state = r;
return result;
}
// Return a number of skiplist levels for a node of size bytes, where
// base is the minimum node size. Compute level=log2(size / base)+n
// where n is 1 if random is false and otherwise a random number generated with
// the standard distribution for a skiplist: See Random() above.
// Bigger nodes tend to have more skiplist levels due to the log2(size / base)
// term, so first-fit searches touch fewer nodes. "level" is clipped so
// level<kMaxLevel and next[level-1] will fit in the node.
// 0 < LLA_SkiplistLevels(x,y,false) <= LLA_SkiplistLevels(x,y,true) < kMaxLevel
static int LLA_SkiplistLevels(size_t size, size_t base, uint32_t *random) {
// max_fit is the maximum number of levels that will fit in a node for the
// given size. We can't return more than max_fit, no matter what the
// random number generator says.
size_t max_fit = (size - offsetof(AllocList, next)) / sizeof(AllocList *);
int level = IntLog2(size, base) + (random != nullptr ? Random(random) : 1);
if (static_cast<size_t>(level) > max_fit) level = static_cast<int>(max_fit);
if (level > kMaxLevel - 1) level = kMaxLevel - 1;
ABSL_RAW_CHECK(level >= 1, "block not big enough for even one level");
return level;
}
// Return "atleast", the first element of AllocList *head s.t. *atleast >= *e.
// For 0 <= i < head->levels, set prev[i] to "no_greater", where no_greater
// points to the last element at level i in the AllocList less than *e, or is
// head if no such element exists.
static AllocList *LLA_SkiplistSearch(AllocList *head, AllocList *e,
AllocList **prev) {
AllocList *p = head;
for (int level = head->levels - 1; level >= 0; level--) {
for (AllocList *n; (n = p->next[level]) != nullptr && n < e; p = n) {
}
prev[level] = p;
}
return (head->levels == 0) ? nullptr : prev[0]->next[0];
}
// Insert element *e into AllocList *head. Set prev[] as LLA_SkiplistSearch.
// Requires that e->levels be previously set by the caller (using
// LLA_SkiplistLevels())
static void LLA_SkiplistInsert(AllocList *head, AllocList *e,
AllocList **prev) {
LLA_SkiplistSearch(head, e, prev);
for (; head->levels < e->levels; head->levels++) { // extend prev pointers
prev[head->levels] = head; // to all *e's levels
}
for (int i = 0; i != e->levels; i++) { // add element to list
e->next[i] = prev[i]->next[i];
prev[i]->next[i] = e;
}
}
// Remove element *e from AllocList *head. Set prev[] as LLA_SkiplistSearch().
// Requires that e->levels be previous set by the caller (using
// LLA_SkiplistLevels())
static void LLA_SkiplistDelete(AllocList *head, AllocList *e,
AllocList **prev) {
AllocList *found = LLA_SkiplistSearch(head, e, prev);
ABSL_RAW_CHECK(e == found, "element not in freelist");
for (int i = 0; i != e->levels && prev[i]->next[i] == e; i++) {
prev[i]->next[i] = e->next[i];
}
while (head->levels > 0 && head->next[head->levels - 1] == nullptr) {
head->levels--; // reduce head->levels if level unused
}
}
// ---------------------------------------------------------------------------
// Arena implementation
// Metadata for an LowLevelAlloc arena instance.
struct LowLevelAlloc::Arena {
// Constructs an arena with the given LowLevelAlloc flags.
explicit Arena(uint32_t flags_value);
base_internal::SpinLock mu;
// Head of free list, sorted by address
AllocList freelist ABSL_GUARDED_BY(mu);
// Count of allocated blocks
int32_t allocation_count ABSL_GUARDED_BY(mu);
// flags passed to NewArena
const uint32_t flags;
// Result of sysconf(_SC_PAGESIZE)
const size_t pagesize;
// Lowest power of two >= max(16, sizeof(AllocList))
const size_t round_up;
// Smallest allocation block size
const size_t min_size;
// PRNG state
uint32_t random ABSL_GUARDED_BY(mu);
};
namespace {
// Static storage space for the lazily-constructed, default global arena
// instances. We require this space because the whole point of LowLevelAlloc
// is to avoid relying on malloc/new.
alignas(LowLevelAlloc::Arena) unsigned char default_arena_storage[sizeof(
LowLevelAlloc::Arena)];
alignas(LowLevelAlloc::Arena) unsigned char unhooked_arena_storage[sizeof(
LowLevelAlloc::Arena)];
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
alignas(
LowLevelAlloc::Arena) unsigned char unhooked_async_sig_safe_arena_storage
[sizeof(LowLevelAlloc::Arena)];
#endif
// We must use LowLevelCallOnce here to construct the global arenas, rather than
// using function-level statics, to avoid recursively invoking the scheduler.
absl::once_flag create_globals_once;
void CreateGlobalArenas() {
new (&default_arena_storage)
LowLevelAlloc::Arena(LowLevelAlloc::kCallMallocHook);
new (&unhooked_arena_storage) LowLevelAlloc::Arena(0);
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
new (&unhooked_async_sig_safe_arena_storage)
LowLevelAlloc::Arena(LowLevelAlloc::kAsyncSignalSafe);
#endif
}
// Returns a global arena that does not call into hooks. Used by NewArena()
// when kCallMallocHook is not set.
LowLevelAlloc::Arena *UnhookedArena() {
base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
return reinterpret_cast<LowLevelAlloc::Arena *>(&unhooked_arena_storage);
}
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
// Returns a global arena that is async-signal safe. Used by NewArena() when
// kAsyncSignalSafe is set.
LowLevelAlloc::Arena *UnhookedAsyncSigSafeArena() {
base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
return reinterpret_cast<LowLevelAlloc::Arena *>(
&unhooked_async_sig_safe_arena_storage);
}
#endif
} // namespace
// Returns the default arena, as used by LowLevelAlloc::Alloc() and friends.
LowLevelAlloc::Arena *LowLevelAlloc::DefaultArena() {
base_internal::LowLevelCallOnce(&create_globals_once, CreateGlobalArenas);
return reinterpret_cast<LowLevelAlloc::Arena *>(&default_arena_storage);
}
// magic numbers to identify allocated and unallocated blocks
static const uintptr_t kMagicAllocated = 0x4c833e95U;
static const uintptr_t kMagicUnallocated = ~kMagicAllocated;
namespace {
class ABSL_SCOPED_LOCKABLE ArenaLock {
public:
explicit ArenaLock(LowLevelAlloc::Arena *arena)
ABSL_EXCLUSIVE_LOCK_FUNCTION(arena->mu)
: arena_(arena) {
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
sigset_t all;
sigfillset(&all);
mask_valid_ = pthread_sigmask(SIG_BLOCK, &all, &mask_) == 0;
}
#endif
arena_->mu.Lock();
}
~ArenaLock() { ABSL_RAW_CHECK(left_, "haven't left Arena region"); }
void Leave() ABSL_UNLOCK_FUNCTION() {
arena_->mu.Unlock();
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if (mask_valid_) {
const int err = pthread_sigmask(SIG_SETMASK, &mask_, nullptr);
if (err != 0) {
ABSL_RAW_LOG(FATAL, "pthread_sigmask failed: %d", err);
}
}
#endif
left_ = true;
}
private:
bool left_ = false; // whether left region
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
bool mask_valid_ = false;
sigset_t mask_; // old mask of blocked signals
#endif
LowLevelAlloc::Arena *arena_;
ArenaLock(const ArenaLock &) = delete;
ArenaLock &operator=(const ArenaLock &) = delete;
};
} // namespace
// create an appropriate magic number for an object at "ptr"
// "magic" should be kMagicAllocated or kMagicUnallocated
inline static uintptr_t Magic(uintptr_t magic, AllocList::Header *ptr) {
return magic ^ reinterpret_cast<uintptr_t>(ptr);
}
namespace {
size_t GetPageSize() {
#ifdef _WIN32
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
return std::max(system_info.dwPageSize, system_info.dwAllocationGranularity);
#elif defined(__wasm__) || defined(__asmjs__) || defined(__hexagon__)
return getpagesize();
#else
return static_cast<size_t>(sysconf(_SC_PAGESIZE));
#endif
}
size_t RoundedUpBlockSize() {
// Round up block sizes to a power of two close to the header size.
size_t round_up = 16;
while (round_up < sizeof(AllocList::Header)) {
round_up += round_up;
}
return round_up;
}
} // namespace
LowLevelAlloc::Arena::Arena(uint32_t flags_value)
: mu(base_internal::SCHEDULE_KERNEL_ONLY),
allocation_count(0),
flags(flags_value),
pagesize(GetPageSize()),
round_up(RoundedUpBlockSize()),
min_size(2 * round_up),
random(0) {
freelist.header.size = 0;
freelist.header.magic = Magic(kMagicUnallocated, &freelist.header);
freelist.header.arena = this;
freelist.levels = 0;
memset(freelist.next, 0, sizeof(freelist.next));
}
// L < meta_data_arena->mu
LowLevelAlloc::Arena *LowLevelAlloc::NewArena(uint32_t flags) {
Arena *meta_data_arena = DefaultArena();
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if ((flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
meta_data_arena = UnhookedAsyncSigSafeArena();
} else // NOLINT(readability/braces)
#endif
if ((flags & LowLevelAlloc::kCallMallocHook) == 0) {
meta_data_arena = UnhookedArena();
}
Arena *result =
new (AllocWithArena(sizeof(*result), meta_data_arena)) Arena(flags);
return result;
}
// L < arena->mu, L < arena->arena->mu
bool LowLevelAlloc::DeleteArena(Arena *arena) {
ABSL_RAW_CHECK(
arena != nullptr && arena != DefaultArena() && arena != UnhookedArena(),
"may not delete default arena");
ArenaLock section(arena);
if (arena->allocation_count != 0) {
section.Leave();
return false;
}
while (arena->freelist.next[0] != nullptr) {
AllocList *region = arena->freelist.next[0];
size_t size = region->header.size;
arena->freelist.next[0] = region->next[0];
ABSL_RAW_CHECK(
region->header.magic == Magic(kMagicUnallocated, &region->header),
"bad magic number in DeleteArena()");
ABSL_RAW_CHECK(region->header.arena == arena,
"bad arena pointer in DeleteArena()");
ABSL_RAW_CHECK(size % arena->pagesize == 0,
"empty arena has non-page-aligned block size");
ABSL_RAW_CHECK(reinterpret_cast<uintptr_t>(region) % arena->pagesize == 0,
"empty arena has non-page-aligned block");
int munmap_result;
#ifdef _WIN32
munmap_result = VirtualFree(region, 0, MEM_RELEASE);
ABSL_RAW_CHECK(munmap_result != 0,
"LowLevelAlloc::DeleteArena: VitualFree failed");
#else
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) == 0) {
munmap_result = munmap(region, size);
} else {
munmap_result = base_internal::DirectMunmap(region, size);
}
#else
munmap_result = munmap(region, size);
#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if (munmap_result != 0) {
ABSL_RAW_LOG(FATAL, "LowLevelAlloc::DeleteArena: munmap failed: %d",
errno);
}
#endif // _WIN32
}
section.Leave();
arena->~Arena();
Free(arena);
return true;
}
// ---------------------------------------------------------------------------
// Addition, checking for overflow. The intent is to die if an external client
// manages to push through a request that would cause arithmetic to fail.
static inline uintptr_t CheckedAdd(uintptr_t a, uintptr_t b) {
uintptr_t sum = a + b;
ABSL_RAW_CHECK(sum >= a, "LowLevelAlloc arithmetic overflow");
return sum;
}
// Return value rounded up to next multiple of align.
// align must be a power of two.
static inline uintptr_t RoundUp(uintptr_t addr, uintptr_t align) {
return CheckedAdd(addr, align - 1) & ~(align - 1);
}
// Equivalent to "return prev->next[i]" but with sanity checking
// that the freelist is in the correct order, that it
// consists of regions marked "unallocated", and that no two regions
// are adjacent in memory (they should have been coalesced).
// L >= arena->mu
static AllocList *Next(int i, AllocList *prev, LowLevelAlloc::Arena *arena) {
ABSL_RAW_CHECK(i < prev->levels, "too few levels in Next()");
AllocList *next = prev->next[i];
if (next != nullptr) {
ABSL_RAW_CHECK(
next->header.magic == Magic(kMagicUnallocated, &next->header),
"bad magic number in Next()");
ABSL_RAW_CHECK(next->header.arena == arena, "bad arena pointer in Next()");
if (prev != &arena->freelist) {
ABSL_RAW_CHECK(prev < next, "unordered freelist");
ABSL_RAW_CHECK(reinterpret_cast<char *>(prev) + prev->header.size <
reinterpret_cast<char *>(next),
"malformed freelist");
}
}
return next;
}
// Coalesce list item "a" with its successor if they are adjacent.
static void Coalesce(AllocList *a) {
AllocList *n = a->next[0];
if (n != nullptr && reinterpret_cast<char *>(a) + a->header.size ==
reinterpret_cast<char *>(n)) {
LowLevelAlloc::Arena *arena = a->header.arena;
a->header.size += n->header.size;
n->header.magic = 0;
n->header.arena = nullptr;
AllocList *prev[kMaxLevel];
LLA_SkiplistDelete(&arena->freelist, n, prev);
LLA_SkiplistDelete(&arena->freelist, a, prev);
a->levels =
LLA_SkiplistLevels(a->header.size, arena->min_size, &arena->random);
LLA_SkiplistInsert(&arena->freelist, a, prev);
}
}
// Adds block at location "v" to the free list
// L >= arena->mu
static void AddToFreelist(void *v, LowLevelAlloc::Arena *arena) {
AllocList *f = reinterpret_cast<AllocList *>(reinterpret_cast<char *>(v) -
sizeof(f->header));
ABSL_RAW_CHECK(f->header.magic == Magic(kMagicAllocated, &f->header),
"bad magic number in AddToFreelist()");
ABSL_RAW_CHECK(f->header.arena == arena,
"bad arena pointer in AddToFreelist()");
f->levels =
LLA_SkiplistLevels(f->header.size, arena->min_size, &arena->random);
AllocList *prev[kMaxLevel];
LLA_SkiplistInsert(&arena->freelist, f, prev);
f->header.magic = Magic(kMagicUnallocated, &f->header);
Coalesce(f); // maybe coalesce with successor
Coalesce(prev[0]); // maybe coalesce with predecessor
}
// Frees storage allocated by LowLevelAlloc::Alloc().
// L < arena->mu
void LowLevelAlloc::Free(void *v) {
if (v != nullptr) {
AllocList *f = reinterpret_cast<AllocList *>(reinterpret_cast<char *>(v) -
sizeof(f->header));
LowLevelAlloc::Arena *arena = f->header.arena;
ArenaLock section(arena);
AddToFreelist(v, arena);
ABSL_RAW_CHECK(arena->allocation_count > 0, "nothing in arena to free");
arena->allocation_count--;
section.Leave();
}
}
// allocates and returns a block of size bytes, to be freed with Free()
// L < arena->mu
static void *DoAllocWithArena(size_t request, LowLevelAlloc::Arena *arena) {
void *result = nullptr;
if (request != 0) {
AllocList *s; // will point to region that satisfies request
ArenaLock section(arena);
// round up with header
size_t req_rnd =
RoundUp(CheckedAdd(request, sizeof(s->header)), arena->round_up);
for (;;) { // loop until we find a suitable region
// find the minimum levels that a block of this size must have
int i = LLA_SkiplistLevels(req_rnd, arena->min_size, nullptr) - 1;
if (i < arena->freelist.levels) { // potential blocks exist
AllocList *before = &arena->freelist; // predecessor of s
while ((s = Next(i, before, arena)) != nullptr &&
s->header.size < req_rnd) {
before = s;
}
if (s != nullptr) { // we found a region
break;
}
}
// we unlock before mmap() both because mmap() may call a callback hook,
// and because it may be slow.
arena->mu.Unlock();
// mmap generous 64K chunks to decrease
// the chances/impact of fragmentation:
size_t new_pages_size = RoundUp(req_rnd, arena->pagesize * 16);
void *new_pages;
#ifdef _WIN32
new_pages = VirtualAlloc(nullptr, new_pages_size,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
ABSL_RAW_CHECK(new_pages != nullptr, "VirtualAlloc failed");
#else
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if ((arena->flags & LowLevelAlloc::kAsyncSignalSafe) != 0) {
new_pages = base_internal::DirectMmap(nullptr, new_pages_size,
PROT_WRITE|PROT_READ, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
} else {
new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
}
#else
new_pages = mmap(nullptr, new_pages_size, PROT_WRITE | PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
#endif // ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
if (new_pages == MAP_FAILED) {
ABSL_RAW_LOG(FATAL, "mmap error: %d", errno);
}
#ifdef __linux__
#if defined(PR_SET_VMA) && defined(PR_SET_VMA_ANON_NAME)
// Attempt to name the allocated address range in /proc/$PID/smaps on
// Linux.
//
// This invocation of prctl() may fail if the Linux kernel was not
// configured with the CONFIG_ANON_VMA_NAME option. This is OK since
// the naming of arenas is primarily a debugging aid.
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, new_pages, new_pages_size,
"absl");
#endif
#endif // __linux__
#endif // _WIN32
arena->mu.Lock();
s = reinterpret_cast<AllocList *>(new_pages);
s->header.size = new_pages_size;
// Pretend the block is allocated; call AddToFreelist() to free it.
s->header.magic = Magic(kMagicAllocated, &s->header);
s->header.arena = arena;
AddToFreelist(&s->levels, arena); // insert new region into free list
}
AllocList *prev[kMaxLevel];
LLA_SkiplistDelete(&arena->freelist, s, prev); // remove from free list
// s points to the first free region that's big enough
if (CheckedAdd(req_rnd, arena->min_size) <= s->header.size) {
// big enough to split
AllocList *n =
reinterpret_cast<AllocList *>(req_rnd + reinterpret_cast<char *>(s));
n->header.size = s->header.size - req_rnd;
n->header.magic = Magic(kMagicAllocated, &n->header);
n->header.arena = arena;
s->header.size = req_rnd;
AddToFreelist(&n->levels, arena);
}
s->header.magic = Magic(kMagicAllocated, &s->header);
ABSL_RAW_CHECK(s->header.arena == arena, "");
arena->allocation_count++;
section.Leave();
result = &s->levels;
}
ABSL_ANNOTATE_MEMORY_IS_UNINITIALIZED(result, request);
return result;
}
void *LowLevelAlloc::Alloc(size_t request) {
void *result = DoAllocWithArena(request, DefaultArena());
return result;
}
void *LowLevelAlloc::AllocWithArena(size_t request, Arena *arena) {
ABSL_RAW_CHECK(arena != nullptr, "must pass a valid arena");
void *result = DoAllocWithArena(request, arena);
return result;
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_LOW_LEVEL_ALLOC_MISSING

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
#define ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_
// A simple thread-safe memory allocator that does not depend on
// mutexes or thread-specific data. It is intended to be used
// sparingly, and only when malloc() would introduce an unwanted
// dependency, such as inside the heap-checker, or the Mutex
// implementation.
// IWYU pragma: private, include "base/low_level_alloc.h"
#include <sys/types.h>
#include <cstdint>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
// LowLevelAlloc requires that the platform support low-level
// allocation of virtual memory. Platforms lacking this cannot use
// LowLevelAlloc.
#ifdef ABSL_LOW_LEVEL_ALLOC_MISSING
#error ABSL_LOW_LEVEL_ALLOC_MISSING cannot be directly set
#elif !defined(ABSL_HAVE_MMAP) && !defined(_WIN32)
#define ABSL_LOW_LEVEL_ALLOC_MISSING 1
#endif
// Using LowLevelAlloc with kAsyncSignalSafe isn't supported on Windows or
// asm.js / WebAssembly.
// See https://kripken.github.io/emscripten-site/docs/porting/pthreads.html
// for more information.
#ifdef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
#error ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING cannot be directly set
#elif defined(_WIN32) || defined(__asmjs__) || defined(__wasm__) || \
defined(__hexagon__)
#define ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING 1
#endif
#include <cstddef>
#include "absl/base/port.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
class LowLevelAlloc {
public:
struct Arena; // an arena from which memory may be allocated
// Returns a pointer to a block of at least "request" bytes
// that have been newly allocated from the specific arena.
// for Alloc() call the DefaultArena() is used.
// Returns 0 if passed request==0.
// Does not return 0 under other circumstances; it crashes if memory
// is not available.
static void *Alloc(size_t request) ABSL_ATTRIBUTE_SECTION(malloc_hook);
static void *AllocWithArena(size_t request, Arena *arena)
ABSL_ATTRIBUTE_SECTION(malloc_hook);
// Deallocates a region of memory that was previously allocated with
// Alloc(). Does nothing if passed 0. "s" must be either 0,
// or must have been returned from a call to Alloc() and not yet passed to
// Free() since that call to Alloc(). The space is returned to the arena
// from which it was allocated.
static void Free(void *s) ABSL_ATTRIBUTE_SECTION(malloc_hook);
// ABSL_ATTRIBUTE_SECTION(malloc_hook) for Alloc* and Free
// are to put all callers of MallocHook::Invoke* in this module
// into special section,
// so that MallocHook::GetCallerStackTrace can function accurately.
// Create a new arena.
// The root metadata for the new arena is allocated in the
// meta_data_arena; the DefaultArena() can be passed for meta_data_arena.
// These values may be ored into flags:
enum {
// Report calls to Alloc() and Free() via the MallocHook interface.
// Set in the DefaultArena.
kCallMallocHook = 0x0001,
#ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
// Make calls to Alloc(), Free() be async-signal-safe. Not set in
// DefaultArena(). Not supported on all platforms.
kAsyncSignalSafe = 0x0002,
#endif
};
// Construct a new arena. The allocation of the underlying metadata honors
// the provided flags. For example, the call NewArena(kAsyncSignalSafe)
// is itself async-signal-safe, as well as generatating an arena that provides
// async-signal-safe Alloc/Free.
static Arena *NewArena(uint32_t flags);
// Destroys an arena allocated by NewArena and returns true,
// provided no allocated blocks remain in the arena.
// If allocated blocks remain in the arena, does nothing and
// returns false.
// It is illegal to attempt to destroy the DefaultArena().
static bool DeleteArena(Arena *arena);
// The default arena that always exists.
static Arena *DefaultArena();
private:
LowLevelAlloc(); // no instances
};
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_LOW_LEVEL_ALLOC_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/low_level_alloc.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <thread> // NOLINT(build/c++11)
#include <unordered_map>
#include <utility>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
#include "absl/container/node_hash_map.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
// This test doesn't use gtest since it needs to test that everything
// works before main().
#define TEST_ASSERT(x) \
if (!(x)) { \
printf("TEST_ASSERT(%s) FAILED ON LINE %d\n", #x, __LINE__); \
abort(); \
}
// a block of memory obtained from the allocator
struct BlockDesc {
char *ptr; // pointer to memory
int len; // number of bytes
int fill; // filled with data starting with this
};
// Check that the pattern placed in the block d
// by RandomizeBlockDesc is still there.
static void CheckBlockDesc(const BlockDesc &d) {
for (int i = 0; i != d.len; i++) {
TEST_ASSERT((d.ptr[i] & 0xff) == ((d.fill + i) & 0xff));
}
}
// Fill the block "*d" with a pattern
// starting with a random byte.
static void RandomizeBlockDesc(BlockDesc *d) {
d->fill = rand() & 0xff;
for (int i = 0; i != d->len; i++) {
d->ptr[i] = (d->fill + i) & 0xff;
}
}
// Use to indicate to the malloc hooks that
// this calls is from LowLevelAlloc.
static bool using_low_level_alloc = false;
// n times, toss a coin, and based on the outcome
// either allocate a new block or deallocate an old block.
// New blocks are placed in a std::unordered_map with a random key
// and initialized with RandomizeBlockDesc().
// If keys conflict, the older block is freed.
// Old blocks are always checked with CheckBlockDesc()
// before being freed. At the end of the run,
// all remaining allocated blocks are freed.
// If use_new_arena is true, use a fresh arena, and then delete it.
// If call_malloc_hook is true and user_arena is true,
// allocations and deallocations are reported via the MallocHook
// interface.
static void Test(bool use_new_arena, bool call_malloc_hook, int n) {
typedef absl::node_hash_map<int, BlockDesc> AllocMap;
AllocMap allocated;
AllocMap::iterator it;
BlockDesc block_desc;
int rnd;
LowLevelAlloc::Arena *arena = nullptr;
if (use_new_arena) {
int32_t flags = call_malloc_hook ? LowLevelAlloc::kCallMallocHook : 0;
arena = LowLevelAlloc::NewArena(flags);
}
for (int i = 0; i != n; i++) {
if (i != 0 && i % 10000 == 0) {
printf(".");
fflush(stdout);
}
switch (rand() & 1) { // toss a coin
case 0: // coin came up heads: add a block
using_low_level_alloc = true;
block_desc.len = rand() & 0x3fff;
block_desc.ptr = reinterpret_cast<char *>(
arena == nullptr
? LowLevelAlloc::Alloc(block_desc.len)
: LowLevelAlloc::AllocWithArena(block_desc.len, arena));
using_low_level_alloc = false;
RandomizeBlockDesc(&block_desc);
rnd = rand();
it = allocated.find(rnd);
if (it != allocated.end()) {
CheckBlockDesc(it->second);
using_low_level_alloc = true;
LowLevelAlloc::Free(it->second.ptr);
using_low_level_alloc = false;
it->second = block_desc;
} else {
allocated[rnd] = block_desc;
}
break;
case 1: // coin came up tails: remove a block
it = allocated.begin();
if (it != allocated.end()) {
CheckBlockDesc(it->second);
using_low_level_alloc = true;
LowLevelAlloc::Free(it->second.ptr);
using_low_level_alloc = false;
allocated.erase(it);
}
break;
}
}
// remove all remaining blocks
while ((it = allocated.begin()) != allocated.end()) {
CheckBlockDesc(it->second);
using_low_level_alloc = true;
LowLevelAlloc::Free(it->second.ptr);
using_low_level_alloc = false;
allocated.erase(it);
}
if (use_new_arena) {
TEST_ASSERT(LowLevelAlloc::DeleteArena(arena));
}
}
// LowLevelAlloc is designed to be safe to call before main().
static struct BeforeMain {
BeforeMain() {
Test(false, false, 50000);
Test(true, false, 50000);
Test(true, true, 50000);
}
} before_main;
} // namespace
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
int main(int argc, char *argv[]) {
// The actual test runs in the global constructor of `before_main`.
printf("PASS\n");
#ifdef __EMSCRIPTEN__
// clang-format off
// This is JS here. Don't try to format it.
MAIN_THREAD_EM_ASM({
if (ENVIRONMENT_IS_WEB) {
if (typeof TEST_FINISH === 'function') {
TEST_FINISH($0);
} else {
console.error('Attempted to exit with status ' + $0);
console.error('But TEST_FINSIHED is not a function.');
}
}
}, 0);
// clang-format on
#endif
return 0;
}

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Core interfaces and definitions used by by low-level interfaces such as
// SpinLock.
#ifndef ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
#define ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/macros.h"
// The following two declarations exist so SchedulingGuard may friend them with
// the appropriate language linkage. These callbacks allow libc internals, such
// as function level statics, to schedule cooperatively when locking.
extern "C" bool __google_disable_rescheduling(void);
extern "C" void __google_enable_rescheduling(bool disable_result);
namespace absl {
ABSL_NAMESPACE_BEGIN
class CondVar;
class Mutex;
namespace synchronization_internal {
int MutexDelay(int32_t c, int mode);
} // namespace synchronization_internal
namespace base_internal {
class SchedulingHelper; // To allow use of SchedulingGuard.
class SpinLock; // To allow use of SchedulingGuard.
// SchedulingGuard
// Provides guard semantics that may be used to disable cooperative rescheduling
// of the calling thread within specific program blocks. This is used to
// protect resources (e.g. low-level SpinLocks or Domain code) that cooperative
// scheduling depends on.
//
// Domain implementations capable of rescheduling in reaction to involuntary
// kernel thread actions (e.g blocking due to a pagefault or syscall) must
// guarantee that an annotated thread is not allowed to (cooperatively)
// reschedule until the annotated region is complete.
//
// It is an error to attempt to use a cooperatively scheduled resource (e.g.
// Mutex) within a rescheduling-disabled region.
//
// All methods are async-signal safe.
class SchedulingGuard {
public:
// Returns true iff the calling thread may be cooperatively rescheduled.
static bool ReschedulingIsAllowed();
SchedulingGuard(const SchedulingGuard&) = delete;
SchedulingGuard& operator=(const SchedulingGuard&) = delete;
private:
// Disable cooperative rescheduling of the calling thread. It may still
// initiate scheduling operations (e.g. wake-ups), however, it may not itself
// reschedule. Nestable. The returned result is opaque, clients should not
// attempt to interpret it.
// REQUIRES: Result must be passed to a pairing EnableScheduling().
static bool DisableRescheduling();
// Marks the end of a rescheduling disabled region, previously started by
// DisableRescheduling().
// REQUIRES: Pairs with innermost call (and result) of DisableRescheduling().
static void EnableRescheduling(bool disable_result);
// A scoped helper for {Disable, Enable}Rescheduling().
// REQUIRES: destructor must run in same thread as constructor.
struct ScopedDisable {
ScopedDisable() { disabled = SchedulingGuard::DisableRescheduling(); }
~ScopedDisable() { SchedulingGuard::EnableRescheduling(disabled); }
bool disabled;
};
// A scoped helper to enable rescheduling temporarily.
// REQUIRES: destructor must run in same thread as constructor.
class ScopedEnable {
public:
ScopedEnable();
~ScopedEnable();
private:
int scheduling_disabled_depth_;
};
// Access to SchedulingGuard is explicitly permitted.
friend class absl::CondVar;
friend class absl::Mutex;
friend class SchedulingHelper;
friend class SpinLock;
friend int absl::synchronization_internal::MutexDelay(int32_t c, int mode);
};
//------------------------------------------------------------------------------
// End of public interfaces.
//------------------------------------------------------------------------------
inline bool SchedulingGuard::ReschedulingIsAllowed() {
return false;
}
inline bool SchedulingGuard::DisableRescheduling() {
return false;
}
inline void SchedulingGuard::EnableRescheduling(bool /* disable_result */) {
return;
}
inline SchedulingGuard::ScopedEnable::ScopedEnable()
: scheduling_disabled_depth_(0) {}
inline SchedulingGuard::ScopedEnable::~ScopedEnable() {
ABSL_RAW_CHECK(scheduling_disabled_depth_ == 0, "disable unused warning");
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_LOW_LEVEL_SCHEDULING_H_

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// Copyright 2023 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_NULLABILITY_IMPL_H_
#define ABSL_BASE_INTERNAL_NULLABILITY_IMPL_H_
#include <memory>
#include <type_traits>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/meta/type_traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace nullability_internal {
template <typename T>
using NullableImpl
#if ABSL_HAVE_CPP_ATTRIBUTE(clang::annotate)
[[clang::annotate("Nullable")]]
#endif
// Don't add the _Nullable attribute in Objective-C compiles. Many Objective-C
// projects enable the `-Wnullable-to-nonnull-conversion warning`, which is
// liable to produce false positives.
#if ABSL_HAVE_FEATURE(nullability_on_classes) && !defined(__OBJC__)
= T _Nullable;
#else
= T;
#endif
template <typename T>
using NonnullImpl
#if ABSL_HAVE_CPP_ATTRIBUTE(clang::annotate)
[[clang::annotate("Nonnull")]]
#endif
#if ABSL_HAVE_FEATURE(nullability_on_classes) && !defined(__OBJC__)
= T _Nonnull;
#else
= T;
#endif
template <typename T>
using NullabilityUnknownImpl
#if ABSL_HAVE_CPP_ATTRIBUTE(clang::annotate)
[[clang::annotate("Nullability_Unspecified")]]
#endif
#if ABSL_HAVE_FEATURE(nullability_on_classes) && !defined(__OBJC__)
= T _Null_unspecified;
#else
= T;
#endif
} // namespace nullability_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_NULLABILITY_IMPL_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
#define ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_
// This header defines two macros:
//
// If the platform supports thread-local storage:
//
// * ABSL_PER_THREAD_TLS_KEYWORD is the C keyword needed to declare a
// thread-local variable
// * ABSL_PER_THREAD_TLS is 1
//
// Otherwise:
//
// * ABSL_PER_THREAD_TLS_KEYWORD is empty
// * ABSL_PER_THREAD_TLS is 0
//
// Microsoft C supports thread-local storage.
// GCC supports it if the appropriate version of glibc is available,
// which the programmer can indicate by defining ABSL_HAVE_TLS
#include "absl/base/port.h" // For ABSL_HAVE_TLS
#if defined(ABSL_PER_THREAD_TLS)
#error ABSL_PER_THREAD_TLS cannot be directly set
#elif defined(ABSL_PER_THREAD_TLS_KEYWORD)
#error ABSL_PER_THREAD_TLS_KEYWORD cannot be directly set
#elif defined(ABSL_HAVE_TLS)
#define ABSL_PER_THREAD_TLS_KEYWORD __thread
#define ABSL_PER_THREAD_TLS 1
#elif defined(_MSC_VER)
#define ABSL_PER_THREAD_TLS_KEYWORD __declspec(thread)
#define ABSL_PER_THREAD_TLS 1
#else
#define ABSL_PER_THREAD_TLS_KEYWORD
#define ABSL_PER_THREAD_TLS 0
#endif
#endif // ABSL_BASE_INTERNAL_PER_THREAD_TLS_H_

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// Copyright 2024 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/poison.h"
#include <cstdlib>
#include "absl/base/config.h"
#include "absl/base/internal/direct_mmap.h"
#ifndef _WIN32
#include <unistd.h>
#endif
#if defined(ABSL_HAVE_ADDRESS_SANITIZER)
#include <sanitizer/asan_interface.h>
#elif defined(ABSL_HAVE_MEMORY_SANITIZER)
#include <sanitizer/msan_interface.h>
#elif defined(ABSL_HAVE_MMAP)
#include <sys/mman.h>
#endif
#if defined(_WIN32)
#include <windows.h>
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
size_t GetPageSize() {
#ifdef _WIN32
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
return system_info.dwPageSize;
#elif defined(__wasm__) || defined(__asmjs__) || defined(__hexagon__)
return getpagesize();
#else
return static_cast<size_t>(sysconf(_SC_PAGESIZE));
#endif
}
} // namespace
void* InitializePoisonedPointerInternal() {
const size_t block_size = GetPageSize();
#if defined(ABSL_HAVE_ADDRESS_SANITIZER)
void* data = malloc(block_size);
ASAN_POISON_MEMORY_REGION(data, block_size);
#elif defined(ABSL_HAVE_MEMORY_SANITIZER)
void* data = malloc(block_size);
__msan_poison(data, block_size);
#elif defined(ABSL_HAVE_MMAP)
void* data = DirectMmap(nullptr, block_size, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (data == MAP_FAILED) return GetBadPointerInternal();
#elif defined(_WIN32)
void* data = VirtualAlloc(nullptr, block_size, MEM_RESERVE | MEM_COMMIT,
PAGE_NOACCESS);
if (data == nullptr) return GetBadPointerInternal();
#else
return GetBadPointerInternal();
#endif
// Return the middle of the block so that dereferences before and after the
// pointer will both crash.
return static_cast<char*>(data) + block_size / 2;
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2024 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_POISON_H_
#define ABSL_BASE_INTERNAL_POISON_H_
#include <cstdint>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
inline void* GetBadPointerInternal() {
// A likely bad pointer. Pointers are required to have high bits that are all
// zero or all one for certain 64-bit CPUs. This pointer value will hopefully
// cause a crash on dereference and also be clearly recognizable as invalid.
constexpr uint64_t kBadPtr = 0xBAD0BAD0BAD0BAD0;
auto ret = reinterpret_cast<void*>(static_cast<uintptr_t>(kBadPtr));
#ifndef _MSC_VER // MSVC doesn't support inline asm with `volatile`.
// Try to prevent the compiler from optimizing out the undefined behavior.
asm volatile("" : : "r"(ret) :); // NOLINT
#endif
return ret;
}
void* InitializePoisonedPointerInternal();
inline void* get_poisoned_pointer() {
#if defined(NDEBUG) && !defined(ABSL_HAVE_ADDRESS_SANITIZER) && \
!defined(ABSL_HAVE_MEMORY_SANITIZER)
// In optimized non-sanitized builds, avoid the function-local static because
// of the codegen and runtime cost.
return GetBadPointerInternal();
#else
// Non-optimized builds may use more robust implementation. Note that we can't
// use a static global because Chromium doesn't allow non-constinit globals.
static void* ptr = InitializePoisonedPointerInternal();
return ptr;
#endif
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_POISON_H_

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// Copyright 2024 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/poison.h"
#include <iostream>
#include "gtest/gtest.h"
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
TEST(PoisonTest, CrashesOnDereference) {
#ifdef __ANDROID__
GTEST_SKIP() << "On Android, poisoned pointer dereference times out instead "
"of crashing.";
#endif
int* poisoned_ptr = static_cast<int*>(get_poisoned_pointer());
EXPECT_DEATH_IF_SUPPORTED(std::cout << *poisoned_ptr, "");
EXPECT_DEATH_IF_SUPPORTED(std::cout << *(poisoned_ptr - 10), "");
EXPECT_DEATH_IF_SUPPORTED(std::cout << *(poisoned_ptr + 10), "");
}
} // namespace
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
#define ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_
// ABSL_PRETTY_FUNCTION
//
// In C++11, __func__ gives the undecorated name of the current function. That
// is, "main", not "int main()". Various compilers give extra macros to get the
// decorated function name, including return type and arguments, to
// differentiate between overload sets. ABSL_PRETTY_FUNCTION is a portable
// version of these macros which forwards to the correct macro on each compiler.
#if defined(_MSC_VER)
#define ABSL_PRETTY_FUNCTION __FUNCSIG__
#elif defined(__GNUC__)
#define ABSL_PRETTY_FUNCTION __PRETTY_FUNCTION__
#else
#error "Unsupported compiler"
#endif
#endif // ABSL_BASE_INTERNAL_PRETTY_FUNCTION_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/raw_logging.h"
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#ifdef __EMSCRIPTEN__
#include <emscripten/console.h>
#endif
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/atomic_hook.h"
#include "absl/base/internal/errno_saver.h"
#include "absl/base/log_severity.h"
// We know how to perform low-level writes to stderr in POSIX and Windows. For
// these platforms, we define the token ABSL_LOW_LEVEL_WRITE_SUPPORTED.
// Much of raw_logging.cc becomes a no-op when we can't output messages,
// although a FATAL ABSL_RAW_LOG message will still abort the process.
// ABSL_HAVE_POSIX_WRITE is defined when the platform provides posix write()
// (as from unistd.h)
//
// This preprocessor token is also defined in raw_io.cc. If you need to copy
// this, consider moving both to config.h instead.
#if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
defined(__hexagon__) || defined(__Fuchsia__) || \
defined(__native_client__) || defined(__OpenBSD__) || \
defined(__EMSCRIPTEN__) || defined(__ASYLO__)
#include <unistd.h>
#define ABSL_HAVE_POSIX_WRITE 1
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
#else
#undef ABSL_HAVE_POSIX_WRITE
#endif
// ABSL_HAVE_SYSCALL_WRITE is defined when the platform provides the syscall
// syscall(SYS_write, /*int*/ fd, /*char* */ buf, /*size_t*/ len);
// for low level operations that want to avoid libc.
#if (defined(__linux__) || defined(__FreeBSD__)) && !defined(__ANDROID__)
#include <sys/syscall.h>
#define ABSL_HAVE_SYSCALL_WRITE 1
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
#else
#undef ABSL_HAVE_SYSCALL_WRITE
#endif
#ifdef _WIN32
#include <io.h>
#define ABSL_HAVE_RAW_IO 1
#define ABSL_LOW_LEVEL_WRITE_SUPPORTED 1
#else
#undef ABSL_HAVE_RAW_IO
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace raw_log_internal {
namespace {
// TODO(gfalcon): We want raw-logging to work on as many platforms as possible.
// Explicitly `#error` out when not `ABSL_LOW_LEVEL_WRITE_SUPPORTED`, except for
// a selected set of platforms for which we expect not to be able to raw log.
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
constexpr char kTruncated[] = " ... (message truncated)\n";
// sprintf the format to the buffer, adjusting *buf and *size to reflect the
// consumed bytes, and return whether the message fit without truncation. If
// truncation occurred, if possible leave room in the buffer for the message
// kTruncated[].
bool VADoRawLog(char** buf, int* size, const char* format, va_list ap)
ABSL_PRINTF_ATTRIBUTE(3, 0);
bool VADoRawLog(char** buf, int* size, const char* format, va_list ap) {
if (*size < 0) return false;
int n = vsnprintf(*buf, static_cast<size_t>(*size), format, ap);
bool result = true;
if (n < 0 || n > *size) {
result = false;
if (static_cast<size_t>(*size) > sizeof(kTruncated)) {
n = *size - static_cast<int>(sizeof(kTruncated));
} else {
n = 0; // no room for truncation message
}
}
*size -= n;
*buf += n;
return result;
}
#endif // ABSL_LOW_LEVEL_WRITE_SUPPORTED
constexpr int kLogBufSize = 3000;
// CAVEAT: vsnprintf called from *DoRawLog below has some (exotic) code paths
// that invoke malloc() and getenv() that might acquire some locks.
// Helper for RawLog below.
// *DoRawLog writes to *buf of *size and move them past the written portion.
// It returns true iff there was no overflow or error.
bool DoRawLog(char** buf, int* size, const char* format, ...)
ABSL_PRINTF_ATTRIBUTE(3, 4);
bool DoRawLog(char** buf, int* size, const char* format, ...) {
if (*size < 0) return false;
va_list ap;
va_start(ap, format);
int n = vsnprintf(*buf, static_cast<size_t>(*size), format, ap);
va_end(ap);
if (n < 0 || n > *size) return false;
*size -= n;
*buf += n;
return true;
}
bool DefaultLogFilterAndPrefix(absl::LogSeverity, const char* file, int line,
char** buf, int* buf_size) {
DoRawLog(buf, buf_size, "[%s : %d] RAW: ", file, line);
return true;
}
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
absl::base_internal::AtomicHook<LogFilterAndPrefixHook>
log_filter_and_prefix_hook(DefaultLogFilterAndPrefix);
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
absl::base_internal::AtomicHook<AbortHook> abort_hook;
void RawLogVA(absl::LogSeverity severity, const char* file, int line,
const char* format, va_list ap) ABSL_PRINTF_ATTRIBUTE(4, 0);
void RawLogVA(absl::LogSeverity severity, const char* file, int line,
const char* format, va_list ap) {
char buffer[kLogBufSize];
char* buf = buffer;
int size = sizeof(buffer);
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
bool enabled = true;
#else
bool enabled = false;
#endif
#ifdef ABSL_MIN_LOG_LEVEL
if (severity < static_cast<absl::LogSeverity>(ABSL_MIN_LOG_LEVEL) &&
severity < absl::LogSeverity::kFatal) {
enabled = false;
}
#endif
enabled = log_filter_and_prefix_hook(severity, file, line, &buf, &size);
const char* const prefix_end = buf;
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
if (enabled) {
bool no_chop = VADoRawLog(&buf, &size, format, ap);
if (no_chop) {
DoRawLog(&buf, &size, "\n");
} else {
DoRawLog(&buf, &size, "%s", kTruncated);
}
AsyncSignalSafeWriteError(buffer, static_cast<size_t>(buf - buffer));
}
#else
static_cast<void>(format);
static_cast<void>(ap);
static_cast<void>(enabled);
#endif
// Abort the process after logging a FATAL message, even if the output itself
// was suppressed.
if (severity == absl::LogSeverity::kFatal) {
abort_hook(file, line, buffer, prefix_end, buffer + kLogBufSize);
abort();
}
}
// Non-formatting version of RawLog().
//
// TODO(gfalcon): When string_view no longer depends on base, change this
// interface to take its message as a string_view instead.
void DefaultInternalLog(absl::LogSeverity severity, const char* file, int line,
const std::string& message) {
RawLog(severity, file, line, "%.*s", static_cast<int>(message.size()),
message.data());
}
} // namespace
void AsyncSignalSafeWriteError(const char* s, size_t len) {
if (!len) return;
absl::base_internal::ErrnoSaver errno_saver;
#if defined(__EMSCRIPTEN__)
// In WebAssembly, bypass filesystem emulation via fwrite.
if (s[len - 1] == '\n') {
// Skip a trailing newline character as emscripten_errn adds one itself.
len--;
}
// emscripten_errn was introduced in 3.1.41 but broken in standalone mode
// until 3.1.43.
#if ABSL_INTERNAL_EMSCRIPTEN_VERSION >= 3001043
emscripten_errn(s, len);
#else
char buf[kLogBufSize];
if (len >= kLogBufSize) {
len = kLogBufSize - 1;
constexpr size_t trunc_len = sizeof(kTruncated) - 2;
memcpy(buf + len - trunc_len, kTruncated, trunc_len);
buf[len] = '\0';
len -= trunc_len;
} else {
buf[len] = '\0';
}
memcpy(buf, s, len);
_emscripten_err(buf);
#endif
#elif defined(ABSL_HAVE_SYSCALL_WRITE)
// We prefer calling write via `syscall` to minimize the risk of libc doing
// something "helpful".
syscall(SYS_write, STDERR_FILENO, s, len);
#elif defined(ABSL_HAVE_POSIX_WRITE)
write(STDERR_FILENO, s, len);
#elif defined(ABSL_HAVE_RAW_IO)
_write(/* stderr */ 2, s, static_cast<unsigned>(len));
#else
// stderr logging unsupported on this platform
(void)s;
(void)len;
#endif
}
void RawLog(absl::LogSeverity severity, const char* file, int line,
const char* format, ...) {
va_list ap;
va_start(ap, format);
RawLogVA(severity, file, line, format, ap);
va_end(ap);
}
bool RawLoggingFullySupported() {
#ifdef ABSL_LOW_LEVEL_WRITE_SUPPORTED
return true;
#else // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
return false;
#endif // !ABSL_LOW_LEVEL_WRITE_SUPPORTED
}
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL
absl::base_internal::AtomicHook<InternalLogFunction>
internal_log_function(DefaultInternalLog);
void RegisterLogFilterAndPrefixHook(LogFilterAndPrefixHook func) {
log_filter_and_prefix_hook.Store(func);
}
void RegisterAbortHook(AbortHook func) { abort_hook.Store(func); }
void RegisterInternalLogFunction(InternalLogFunction func) {
internal_log_function.Store(func);
}
} // namespace raw_log_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Thread-safe logging routines that do not allocate any memory or
// acquire any locks, and can therefore be used by low-level memory
// allocation, synchronization, and signal-handling code.
#ifndef ABSL_BASE_INTERNAL_RAW_LOGGING_H_
#define ABSL_BASE_INTERNAL_RAW_LOGGING_H_
#include <string>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/atomic_hook.h"
#include "absl/base/log_severity.h"
#include "absl/base/macros.h"
#include "absl/base/optimization.h"
#include "absl/base/port.h"
// This is similar to LOG(severity) << format..., but
// * it is to be used ONLY by low-level modules that can't use normal LOG()
// * it is designed to be a low-level logger that does not allocate any
// memory and does not need any locks, hence:
// * it logs straight and ONLY to STDERR w/o buffering
// * it uses an explicit printf-format and arguments list
// * it will silently chop off really long message strings
// Usage example:
// ABSL_RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
// This will print an almost standard log line like this to stderr only:
// E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
#define ABSL_RAW_LOG(severity, ...) \
do { \
constexpr const char* absl_raw_log_internal_basename = \
::absl::raw_log_internal::Basename(__FILE__, sizeof(__FILE__) - 1); \
::absl::raw_log_internal::RawLog(ABSL_RAW_LOG_INTERNAL_##severity, \
absl_raw_log_internal_basename, __LINE__, \
__VA_ARGS__); \
ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_##severity; \
} while (0)
// Similar to CHECK(condition) << message, but for low-level modules:
// we use only ABSL_RAW_LOG that does not allocate memory.
// We do not want to provide args list here to encourage this usage:
// if (!cond) ABSL_RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
// so that the args are not computed when not needed.
#define ABSL_RAW_CHECK(condition, message) \
do { \
if (ABSL_PREDICT_FALSE(!(condition))) { \
ABSL_RAW_LOG(FATAL, "Check %s failed: %s", #condition, message); \
} \
} while (0)
// ABSL_INTERNAL_LOG and ABSL_INTERNAL_CHECK work like the RAW variants above,
// except that if the richer log library is linked into the binary, we dispatch
// to that instead. This is potentially useful for internal logging and
// assertions, where we are using RAW_LOG neither for its async-signal-safety
// nor for its non-allocating nature, but rather because raw logging has very
// few other dependencies.
//
// The API is a subset of the above: each macro only takes two arguments. Use
// StrCat if you need to build a richer message.
#define ABSL_INTERNAL_LOG(severity, message) \
do { \
constexpr const char* absl_raw_log_internal_filename = __FILE__; \
::absl::raw_log_internal::internal_log_function( \
ABSL_RAW_LOG_INTERNAL_##severity, absl_raw_log_internal_filename, \
__LINE__, message); \
ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_##severity; \
} while (0)
#define ABSL_INTERNAL_CHECK(condition, message) \
do { \
if (ABSL_PREDICT_FALSE(!(condition))) { \
std::string death_message = "Check " #condition " failed: "; \
death_message += std::string(message); \
ABSL_INTERNAL_LOG(FATAL, death_message); \
} \
} while (0)
#ifndef NDEBUG
#define ABSL_RAW_DLOG(severity, ...) ABSL_RAW_LOG(severity, __VA_ARGS__)
#define ABSL_RAW_DCHECK(condition, message) ABSL_RAW_CHECK(condition, message)
#else // NDEBUG
#define ABSL_RAW_DLOG(severity, ...) \
while (false) ABSL_RAW_LOG(severity, __VA_ARGS__)
#define ABSL_RAW_DCHECK(condition, message) \
while (false) ABSL_RAW_CHECK(condition, message)
#endif // NDEBUG
#define ABSL_RAW_LOG_INTERNAL_INFO ::absl::LogSeverity::kInfo
#define ABSL_RAW_LOG_INTERNAL_WARNING ::absl::LogSeverity::kWarning
#define ABSL_RAW_LOG_INTERNAL_ERROR ::absl::LogSeverity::kError
#define ABSL_RAW_LOG_INTERNAL_FATAL ::absl::LogSeverity::kFatal
#define ABSL_RAW_LOG_INTERNAL_DFATAL ::absl::kLogDebugFatal
#define ABSL_RAW_LOG_INTERNAL_LEVEL(severity) \
::absl::NormalizeLogSeverity(severity)
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_INFO
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_WARNING
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_ERROR
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_FATAL ABSL_UNREACHABLE()
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_DFATAL
#define ABSL_RAW_LOG_INTERNAL_MAYBE_UNREACHABLE_LEVEL(severity)
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace raw_log_internal {
// Helper function to implement ABSL_RAW_LOG
// Logs format... at "severity" level, reporting it
// as called from file:line.
// This does not allocate memory or acquire locks.
void RawLog(absl::LogSeverity severity, const char* file, int line,
const char* format, ...) ABSL_PRINTF_ATTRIBUTE(4, 5);
// Writes the provided buffer directly to stderr, in a signal-safe, low-level
// manner. Preserves errno.
void AsyncSignalSafeWriteError(const char* s, size_t len);
// compile-time function to get the "base" filename, that is, the part of
// a filename after the last "/" or "\" path separator. The search starts at
// the end of the string; the second parameter is the length of the string.
constexpr const char* Basename(const char* fname, int offset) {
return offset == 0 || fname[offset - 1] == '/' || fname[offset - 1] == '\\'
? fname + offset
: Basename(fname, offset - 1);
}
// For testing only.
// Returns true if raw logging is fully supported. When it is not
// fully supported, no messages will be emitted, but a log at FATAL
// severity will cause an abort.
//
// TODO(gfalcon): Come up with a better name for this method.
bool RawLoggingFullySupported();
// Function type for a raw_log customization hook for suppressing messages
// by severity, and for writing custom prefixes on non-suppressed messages.
//
// The installed hook is called for every raw log invocation. The message will
// be logged to stderr only if the hook returns true. FATAL errors will cause
// the process to abort, even if writing to stderr is suppressed. The hook is
// also provided with an output buffer, where it can write a custom log message
// prefix.
//
// The raw_log system does not allocate memory or grab locks. User-provided
// hooks must avoid these operations, and must not throw exceptions.
//
// 'severity' is the severity level of the message being written.
// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
// was located.
// 'buf' and 'buf_size' are pointers to the buffer and buffer size. If the
// hook writes a prefix, it must increment *buf and decrement *buf_size
// accordingly.
using LogFilterAndPrefixHook = bool (*)(absl::LogSeverity severity,
const char* file, int line, char** buf,
int* buf_size);
// Function type for a raw_log customization hook called to abort a process
// when a FATAL message is logged. If the provided AbortHook() returns, the
// logging system will call abort().
//
// 'file' and 'line' are the file and line number where the ABSL_RAW_LOG macro
// was located.
// The NUL-terminated logged message lives in the buffer between 'buf_start'
// and 'buf_end'. 'prefix_end' points to the first non-prefix character of the
// buffer (as written by the LogFilterAndPrefixHook.)
//
// The lifetime of the filename and message buffers will not end while the
// process remains alive.
using AbortHook = void (*)(const char* file, int line, const char* buf_start,
const char* prefix_end, const char* buf_end);
// Internal logging function for ABSL_INTERNAL_LOG to dispatch to.
//
// TODO(gfalcon): When string_view no longer depends on base, change this
// interface to take its message as a string_view instead.
using InternalLogFunction = void (*)(absl::LogSeverity severity,
const char* file, int line,
const std::string& message);
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES ABSL_DLL extern base_internal::AtomicHook<
InternalLogFunction>
internal_log_function;
// Registers hooks of the above types. Only a single hook of each type may be
// registered. It is an error to call these functions multiple times with
// different input arguments.
//
// These functions are safe to call at any point during initialization; they do
// not block or malloc, and are async-signal safe.
void RegisterLogFilterAndPrefixHook(LogFilterAndPrefixHook func);
void RegisterAbortHook(AbortHook func);
void RegisterInternalLogFunction(InternalLogFunction func);
} // namespace raw_log_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_RAW_LOGGING_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Core interfaces and definitions used by by low-level interfaces such as
// SpinLock.
#ifndef ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
#define ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// Used to describe how a thread may be scheduled. Typically associated with
// the declaration of a resource supporting synchronized access.
//
// SCHEDULE_COOPERATIVE_AND_KERNEL:
// Specifies that when waiting, a cooperative thread (e.g. a Fiber) may
// reschedule (using base::scheduling semantics); allowing other cooperative
// threads to proceed.
//
// SCHEDULE_KERNEL_ONLY: (Also described as "non-cooperative")
// Specifies that no cooperative scheduling semantics may be used, even if the
// current thread is itself cooperatively scheduled. This means that
// cooperative threads will NOT allow other cooperative threads to execute in
// their place while waiting for a resource of this type. Host operating system
// semantics (e.g. a futex) may still be used.
//
// When optional, clients should strongly prefer SCHEDULE_COOPERATIVE_AND_KERNEL
// by default. SCHEDULE_KERNEL_ONLY should only be used for resources on which
// base::scheduling (e.g. the implementation of a Scheduler) may depend.
//
// NOTE: Cooperative resources may not be nested below non-cooperative ones.
// This means that it is invalid to to acquire a SCHEDULE_COOPERATIVE_AND_KERNEL
// resource if a SCHEDULE_KERNEL_ONLY resource is already held.
enum SchedulingMode {
SCHEDULE_KERNEL_ONLY = 0, // Allow scheduling only the host OS.
SCHEDULE_COOPERATIVE_AND_KERNEL, // Also allow cooperative scheduling.
};
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_SCHEDULING_MODE_H_

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// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/scoped_set_env.h"
#ifdef _WIN32
#include <windows.h>
#endif
#include <cstdlib>
#include "absl/base/internal/raw_logging.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
#ifdef _WIN32
const int kMaxEnvVarValueSize = 1024;
#endif
void SetEnvVar(const char* name, const char* value) {
#ifdef _WIN32
SetEnvironmentVariableA(name, value);
#else
if (value == nullptr) {
::unsetenv(name);
} else {
::setenv(name, value, 1);
}
#endif
}
} // namespace
ScopedSetEnv::ScopedSetEnv(const char* var_name, const char* new_value)
: var_name_(var_name), was_unset_(false) {
#ifdef _WIN32
char buf[kMaxEnvVarValueSize];
auto get_res = GetEnvironmentVariableA(var_name_.c_str(), buf, sizeof(buf));
ABSL_INTERNAL_CHECK(get_res < sizeof(buf), "value exceeds buffer size");
if (get_res == 0) {
was_unset_ = (GetLastError() == ERROR_ENVVAR_NOT_FOUND);
} else {
old_value_.assign(buf, get_res);
}
SetEnvironmentVariableA(var_name_.c_str(), new_value);
#else
const char* val = ::getenv(var_name_.c_str());
if (val == nullptr) {
was_unset_ = true;
} else {
old_value_ = val;
}
#endif
SetEnvVar(var_name_.c_str(), new_value);
}
ScopedSetEnv::~ScopedSetEnv() {
SetEnvVar(var_name_.c_str(), was_unset_ ? nullptr : old_value_.c_str());
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
#define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
#include <string>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
class ScopedSetEnv {
public:
ScopedSetEnv(const char* var_name, const char* new_value);
~ScopedSetEnv();
private:
std::string var_name_;
std::string old_value_;
// True if the environment variable was initially not set.
bool was_unset_;
};
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_

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// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifdef _WIN32
#include <windows.h>
#endif
#include "gtest/gtest.h"
#include "absl/base/internal/scoped_set_env.h"
namespace {
using absl::base_internal::ScopedSetEnv;
std::string GetEnvVar(const char* name) {
#ifdef _WIN32
char buf[1024];
auto get_res = GetEnvironmentVariableA(name, buf, sizeof(buf));
if (get_res >= sizeof(buf)) {
return "TOO_BIG";
}
if (get_res == 0) {
return "UNSET";
}
return std::string(buf, get_res);
#else
const char* val = ::getenv(name);
if (val == nullptr) {
return "UNSET";
}
return val;
#endif
}
TEST(ScopedSetEnvTest, SetNonExistingVarToString) {
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
{
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
}
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
}
TEST(ScopedSetEnvTest, SetNonExistingVarToNull) {
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
{
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
}
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
}
TEST(ScopedSetEnvTest, SetExistingVarToString) {
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
{
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "new_value");
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "new_value");
}
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
}
TEST(ScopedSetEnvTest, SetExistingVarToNull) {
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
{
ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
}
EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
}
} // namespace

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/spinlock.h"
#include <algorithm>
#include <atomic>
#include <limits>
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/base/internal/atomic_hook.h"
#include "absl/base/internal/cycleclock.h"
#include "absl/base/internal/spinlock_wait.h"
#include "absl/base/internal/sysinfo.h" /* For NumCPUs() */
#include "absl/base/call_once.h"
// Description of lock-word:
// 31..00: [............................3][2][1][0]
//
// [0]: kSpinLockHeld
// [1]: kSpinLockCooperative
// [2]: kSpinLockDisabledScheduling
// [31..3]: ONLY kSpinLockSleeper OR
// Wait time in cycles >> PROFILE_TIMESTAMP_SHIFT
//
// Detailed descriptions:
//
// Bit [0]: The lock is considered held iff kSpinLockHeld is set.
//
// Bit [1]: Eligible waiters (e.g. Fibers) may co-operatively reschedule when
// contended iff kSpinLockCooperative is set.
//
// Bit [2]: This bit is exclusive from bit [1]. It is used only by a
// non-cooperative lock. When set, indicates that scheduling was
// successfully disabled when the lock was acquired. May be unset,
// even if non-cooperative, if a ThreadIdentity did not yet exist at
// time of acquisition.
//
// Bit [3]: If this is the only upper bit ([31..3]) set then this lock was
// acquired without contention, however, at least one waiter exists.
//
// Otherwise, bits [31..3] represent the time spent by the current lock
// holder to acquire the lock. There may be outstanding waiter(s).
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static base_internal::AtomicHook<void (*)(
const void *lock, int64_t wait_cycles)>
submit_profile_data;
void RegisterSpinLockProfiler(void (*fn)(const void *contendedlock,
int64_t wait_cycles)) {
submit_profile_data.Store(fn);
}
// Uncommon constructors.
SpinLock::SpinLock(base_internal::SchedulingMode mode)
: lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {
ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
}
// Monitor the lock to see if its value changes within some time period
// (adaptive_spin_count loop iterations). The last value read from the lock
// is returned from the method.
uint32_t SpinLock::SpinLoop() {
// We are already in the slow path of SpinLock, initialize the
// adaptive_spin_count here.
ABSL_CONST_INIT static absl::once_flag init_adaptive_spin_count;
ABSL_CONST_INIT static int adaptive_spin_count = 0;
base_internal::LowLevelCallOnce(&init_adaptive_spin_count, []() {
adaptive_spin_count = base_internal::NumCPUs() > 1 ? 1000 : 1;
});
int c = adaptive_spin_count;
uint32_t lock_value;
do {
lock_value = lockword_.load(std::memory_order_relaxed);
} while ((lock_value & kSpinLockHeld) != 0 && --c > 0);
return lock_value;
}
void SpinLock::SlowLock() {
uint32_t lock_value = SpinLoop();
lock_value = TryLockInternal(lock_value, 0);
if ((lock_value & kSpinLockHeld) == 0) {
return;
}
base_internal::SchedulingMode scheduling_mode;
if ((lock_value & kSpinLockCooperative) != 0) {
scheduling_mode = base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
} else {
scheduling_mode = base_internal::SCHEDULE_KERNEL_ONLY;
}
// The lock was not obtained initially, so this thread needs to wait for
// it. Record the current timestamp in the local variable wait_start_time
// so the total wait time can be stored in the lockword once this thread
// obtains the lock.
int64_t wait_start_time = CycleClock::Now();
uint32_t wait_cycles = 0;
int lock_wait_call_count = 0;
while ((lock_value & kSpinLockHeld) != 0) {
// If the lock is currently held, but not marked as having a sleeper, mark
// it as having a sleeper.
if ((lock_value & kWaitTimeMask) == 0) {
// Here, just "mark" that the thread is going to sleep. Don't store the
// lock wait time in the lock -- the lock word stores the amount of time
// that the current holder waited before acquiring the lock, not the wait
// time of any thread currently waiting to acquire it.
if (lockword_.compare_exchange_strong(
lock_value, lock_value | kSpinLockSleeper,
std::memory_order_relaxed, std::memory_order_relaxed)) {
// Successfully transitioned to kSpinLockSleeper. Pass
// kSpinLockSleeper to the SpinLockWait routine to properly indicate
// the last lock_value observed.
lock_value |= kSpinLockSleeper;
} else if ((lock_value & kSpinLockHeld) == 0) {
// Lock is free again, so try and acquire it before sleeping. The
// new lock state will be the number of cycles this thread waited if
// this thread obtains the lock.
lock_value = TryLockInternal(lock_value, wait_cycles);
continue; // Skip the delay at the end of the loop.
} else if ((lock_value & kWaitTimeMask) == 0) {
// The lock is still held, without a waiter being marked, but something
// else about the lock word changed, causing our CAS to fail. For
// example, a new lock holder may have acquired the lock with
// kSpinLockDisabledScheduling set, whereas the previous holder had not
// set that flag. In this case, attempt again to mark ourselves as a
// waiter.
continue;
}
}
// SpinLockDelay() calls into fiber scheduler, we need to see
// synchronization there to avoid false positives.
ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
// Wait for an OS specific delay.
base_internal::SpinLockDelay(&lockword_, lock_value, ++lock_wait_call_count,
scheduling_mode);
ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
// Spin again after returning from the wait routine to give this thread
// some chance of obtaining the lock.
lock_value = SpinLoop();
wait_cycles = EncodeWaitCycles(wait_start_time, CycleClock::Now());
lock_value = TryLockInternal(lock_value, wait_cycles);
}
}
void SpinLock::SlowUnlock(uint32_t lock_value) {
base_internal::SpinLockWake(&lockword_,
false); // wake waiter if necessary
// If our acquisition was contended, collect contentionz profile info. We
// reserve a unitary wait time to represent that a waiter exists without our
// own acquisition having been contended.
if ((lock_value & kWaitTimeMask) != kSpinLockSleeper) {
const int64_t wait_cycles = DecodeWaitCycles(lock_value);
ABSL_TSAN_MUTEX_PRE_DIVERT(this, 0);
submit_profile_data(this, wait_cycles);
ABSL_TSAN_MUTEX_POST_DIVERT(this, 0);
}
}
// We use the upper 29 bits of the lock word to store the time spent waiting to
// acquire this lock. This is reported by contentionz profiling. Since the
// lower bits of the cycle counter wrap very quickly on high-frequency
// processors we divide to reduce the granularity to 2^kProfileTimestampShift
// sized units. On a 4Ghz machine this will lose track of wait times greater
// than (2^29/4 Ghz)*128 =~ 17.2 seconds. Such waits should be extremely rare.
static constexpr int kProfileTimestampShift = 7;
// We currently reserve the lower 3 bits.
static constexpr int kLockwordReservedShift = 3;
uint32_t SpinLock::EncodeWaitCycles(int64_t wait_start_time,
int64_t wait_end_time) {
static const int64_t kMaxWaitTime =
std::numeric_limits<uint32_t>::max() >> kLockwordReservedShift;
int64_t scaled_wait_time =
(wait_end_time - wait_start_time) >> kProfileTimestampShift;
// Return a representation of the time spent waiting that can be stored in
// the lock word's upper bits.
uint32_t clamped = static_cast<uint32_t>(
std::min(scaled_wait_time, kMaxWaitTime) << kLockwordReservedShift);
if (clamped == 0) {
return kSpinLockSleeper; // Just wake waiters, but don't record contention.
}
// Bump up value if necessary to avoid returning kSpinLockSleeper.
const uint32_t kMinWaitTime =
kSpinLockSleeper + (1 << kLockwordReservedShift);
if (clamped == kSpinLockSleeper) {
return kMinWaitTime;
}
return clamped;
}
int64_t SpinLock::DecodeWaitCycles(uint32_t lock_value) {
// Cast to uint32_t first to ensure bits [63:32] are cleared.
const int64_t scaled_wait_time =
static_cast<uint32_t>(lock_value & kWaitTimeMask);
return scaled_wait_time << (kProfileTimestampShift - kLockwordReservedShift);
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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//
// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Most users requiring mutual exclusion should use Mutex.
// SpinLock is provided for use in two situations:
// - for use by Abseil internal code that Mutex itself depends on
// - for async signal safety (see below)
// SpinLock with a base_internal::SchedulingMode::SCHEDULE_KERNEL_ONLY is async
// signal safe. If a spinlock is used within a signal handler, all code that
// acquires the lock must ensure that the signal cannot arrive while they are
// holding the lock. Typically, this is done by blocking the signal.
//
// Threads waiting on a SpinLock may be woken in an arbitrary order.
#ifndef ABSL_BASE_INTERNAL_SPINLOCK_H_
#define ABSL_BASE_INTERNAL_SPINLOCK_H_
#include <atomic>
#include <cstdint>
#include "absl/base/attributes.h"
#include "absl/base/const_init.h"
#include "absl/base/dynamic_annotations.h"
#include "absl/base/internal/low_level_scheduling.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/internal/tsan_mutex_interface.h"
#include "absl/base/thread_annotations.h"
namespace tcmalloc {
namespace tcmalloc_internal {
class AllocationGuardSpinLockHolder;
} // namespace tcmalloc_internal
} // namespace tcmalloc
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
class ABSL_LOCKABLE ABSL_ATTRIBUTE_WARN_UNUSED SpinLock {
public:
SpinLock() : lockword_(kSpinLockCooperative) {
ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
}
// Constructors that allow non-cooperative spinlocks to be created for use
// inside thread schedulers. Normal clients should not use these.
explicit SpinLock(base_internal::SchedulingMode mode);
// Constructor for global SpinLock instances. See absl/base/const_init.h.
constexpr SpinLock(absl::ConstInitType, base_internal::SchedulingMode mode)
: lockword_(IsCooperative(mode) ? kSpinLockCooperative : 0) {}
// For global SpinLock instances prefer trivial destructor when possible.
// Default but non-trivial destructor in some build configurations causes an
// extra static initializer.
#ifdef ABSL_INTERNAL_HAVE_TSAN_INTERFACE
~SpinLock() { ABSL_TSAN_MUTEX_DESTROY(this, __tsan_mutex_not_static); }
#else
~SpinLock() = default;
#endif
// Acquire this SpinLock.
inline void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() {
ABSL_TSAN_MUTEX_PRE_LOCK(this, 0);
if (!TryLockImpl()) {
SlowLock();
}
ABSL_TSAN_MUTEX_POST_LOCK(this, 0, 0);
}
// Try to acquire this SpinLock without blocking and return true if the
// acquisition was successful. If the lock was not acquired, false is
// returned. If this SpinLock is free at the time of the call, TryLock
// will return true with high probability.
[[nodiscard]] inline bool TryLock() ABSL_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
ABSL_TSAN_MUTEX_PRE_LOCK(this, __tsan_mutex_try_lock);
bool res = TryLockImpl();
ABSL_TSAN_MUTEX_POST_LOCK(
this, __tsan_mutex_try_lock | (res ? 0 : __tsan_mutex_try_lock_failed),
0);
return res;
}
// Release this SpinLock, which must be held by the calling thread.
inline void Unlock() ABSL_UNLOCK_FUNCTION() {
ABSL_TSAN_MUTEX_PRE_UNLOCK(this, 0);
uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
lock_value = lockword_.exchange(lock_value & kSpinLockCooperative,
std::memory_order_release);
if ((lock_value & kSpinLockDisabledScheduling) != 0) {
base_internal::SchedulingGuard::EnableRescheduling(true);
}
if ((lock_value & kWaitTimeMask) != 0) {
// Collect contentionz profile info, and speed the wakeup of any waiter.
// The wait_cycles value indicates how long this thread spent waiting
// for the lock.
SlowUnlock(lock_value);
}
ABSL_TSAN_MUTEX_POST_UNLOCK(this, 0);
}
// Determine if the lock is held. When the lock is held by the invoking
// thread, true will always be returned. Intended to be used as
// CHECK(lock.IsHeld()).
[[nodiscard]] inline bool IsHeld() const {
return (lockword_.load(std::memory_order_relaxed) & kSpinLockHeld) != 0;
}
// Return immediately if this thread holds the SpinLock exclusively.
// Otherwise, report an error by crashing with a diagnostic.
inline void AssertHeld() const ABSL_ASSERT_EXCLUSIVE_LOCK() {
if (!IsHeld()) {
ABSL_RAW_LOG(FATAL, "thread should hold the lock on SpinLock");
}
}
protected:
// These should not be exported except for testing.
// Store number of cycles between wait_start_time and wait_end_time in a
// lock value.
static uint32_t EncodeWaitCycles(int64_t wait_start_time,
int64_t wait_end_time);
// Extract number of wait cycles in a lock value.
static int64_t DecodeWaitCycles(uint32_t lock_value);
// Provide access to protected method above. Use for testing only.
friend struct SpinLockTest;
friend class tcmalloc::tcmalloc_internal::AllocationGuardSpinLockHolder;
private:
// lockword_ is used to store the following:
//
// bit[0] encodes whether a lock is being held.
// bit[1] encodes whether a lock uses cooperative scheduling.
// bit[2] encodes whether the current lock holder disabled scheduling when
// acquiring the lock. Only set when kSpinLockHeld is also set.
// bit[3:31] encodes time a lock spent on waiting as a 29-bit unsigned int.
// This is set by the lock holder to indicate how long it waited on
// the lock before eventually acquiring it. The number of cycles is
// encoded as a 29-bit unsigned int, or in the case that the current
// holder did not wait but another waiter is queued, the LSB
// (kSpinLockSleeper) is set. The implementation does not explicitly
// track the number of queued waiters beyond this. It must always be
// assumed that waiters may exist if the current holder was required to
// queue.
//
// Invariant: if the lock is not held, the value is either 0 or
// kSpinLockCooperative.
static constexpr uint32_t kSpinLockHeld = 1;
static constexpr uint32_t kSpinLockCooperative = 2;
static constexpr uint32_t kSpinLockDisabledScheduling = 4;
static constexpr uint32_t kSpinLockSleeper = 8;
// Includes kSpinLockSleeper.
static constexpr uint32_t kWaitTimeMask =
~(kSpinLockHeld | kSpinLockCooperative | kSpinLockDisabledScheduling);
// Returns true if the provided scheduling mode is cooperative.
static constexpr bool IsCooperative(
base_internal::SchedulingMode scheduling_mode) {
return scheduling_mode == base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL;
}
bool IsCooperative() const {
return lockword_.load(std::memory_order_relaxed) & kSpinLockCooperative;
}
uint32_t TryLockInternal(uint32_t lock_value, uint32_t wait_cycles);
void SlowLock() ABSL_ATTRIBUTE_COLD;
void SlowUnlock(uint32_t lock_value) ABSL_ATTRIBUTE_COLD;
uint32_t SpinLoop();
inline bool TryLockImpl() {
uint32_t lock_value = lockword_.load(std::memory_order_relaxed);
return (TryLockInternal(lock_value, 0) & kSpinLockHeld) == 0;
}
std::atomic<uint32_t> lockword_;
SpinLock(const SpinLock&) = delete;
SpinLock& operator=(const SpinLock&) = delete;
};
// Corresponding locker object that arranges to acquire a spinlock for
// the duration of a C++ scope.
class ABSL_SCOPED_LOCKABLE [[nodiscard]] SpinLockHolder {
public:
inline explicit SpinLockHolder(SpinLock* l) ABSL_EXCLUSIVE_LOCK_FUNCTION(l)
: lock_(l) {
l->Lock();
}
inline ~SpinLockHolder() ABSL_UNLOCK_FUNCTION() { lock_->Unlock(); }
SpinLockHolder(const SpinLockHolder&) = delete;
SpinLockHolder& operator=(const SpinLockHolder&) = delete;
private:
SpinLock* lock_;
};
// Register a hook for profiling support.
//
// The function pointer registered here will be called whenever a spinlock is
// contended. The callback is given an opaque handle to the contended spinlock
// and the number of wait cycles. This is thread-safe, but only a single
// profiler can be registered. It is an error to call this function multiple
// times with different arguments.
void RegisterSpinLockProfiler(void (*fn)(const void* lock,
int64_t wait_cycles));
//------------------------------------------------------------------------------
// Public interface ends here.
//------------------------------------------------------------------------------
// If (result & kSpinLockHeld) == 0, then *this was successfully locked.
// Otherwise, returns last observed value for lockword_.
inline uint32_t SpinLock::TryLockInternal(uint32_t lock_value,
uint32_t wait_cycles) {
if ((lock_value & kSpinLockHeld) != 0) {
return lock_value;
}
uint32_t sched_disabled_bit = 0;
if ((lock_value & kSpinLockCooperative) == 0) {
// For non-cooperative locks we must make sure we mark ourselves as
// non-reschedulable before we attempt to CompareAndSwap.
if (base_internal::SchedulingGuard::DisableRescheduling()) {
sched_disabled_bit = kSpinLockDisabledScheduling;
}
}
if (!lockword_.compare_exchange_strong(
lock_value,
kSpinLockHeld | lock_value | wait_cycles | sched_disabled_bit,
std::memory_order_acquire, std::memory_order_relaxed)) {
base_internal::SchedulingGuard::EnableRescheduling(sched_disabled_bit != 0);
}
return lock_value;
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_SPINLOCK_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is an Akaros-specific part of spinlock_wait.cc
#include <atomic>
#include "absl/base/internal/scheduling_mode.h"
extern "C" {
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */,
int /* loop */, absl::base_internal::SchedulingMode /* mode */) {
// In Akaros, one must take care not to call anything that could cause a
// malloc(), a blocking system call, or a uthread_yield() while holding a
// spinlock. Our callers assume will not call into libraries or other
// arbitrary code.
}
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(
std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
} // extern "C"

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock
// and Mutex performance under varying levels of contention.
#include "absl/base/internal/raw_logging.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/internal/spinlock.h"
#include "absl/base/no_destructor.h"
#include "absl/synchronization/internal/create_thread_identity.h"
#include "benchmark/benchmark.h"
namespace {
template <absl::base_internal::SchedulingMode scheduling_mode>
static void BM_TryLock(benchmark::State& state) {
// Ensure a ThreadIdentity is installed so that KERNEL_ONLY has an effect.
ABSL_INTERNAL_CHECK(
absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=
nullptr,
"GetOrCreateCurrentThreadIdentity() failed");
static absl::NoDestructor<absl::base_internal::SpinLock> spinlock(
scheduling_mode);
for (auto _ : state) {
if (spinlock->TryLock()) spinlock->Unlock();
}
}
template <absl::base_internal::SchedulingMode scheduling_mode>
static void BM_SpinLock(benchmark::State& state) {
// Ensure a ThreadIdentity is installed so that KERNEL_ONLY has an effect.
ABSL_INTERNAL_CHECK(
absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=
nullptr,
"GetOrCreateCurrentThreadIdentity() failed");
static absl::NoDestructor<absl::base_internal::SpinLock> spinlock(
scheduling_mode);
for (auto _ : state) {
absl::base_internal::SpinLockHolder holder(spinlock.get());
}
}
BENCHMARK_TEMPLATE(BM_SpinLock,
absl::base_internal::SCHEDULE_KERNEL_ONLY)
->UseRealTime()
->Threads(1)
->ThreadPerCpu();
BENCHMARK_TEMPLATE(BM_SpinLock,
absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)
->UseRealTime()
->Threads(1)
->ThreadPerCpu();
BENCHMARK_TEMPLATE(BM_TryLock, absl::base_internal::SCHEDULE_KERNEL_ONLY)
->UseRealTime()
->Threads(1)
->ThreadPerCpu();
BENCHMARK_TEMPLATE(BM_TryLock,
absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)
->UseRealTime()
->Threads(1)
->ThreadPerCpu();
} // namespace

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// Copyright 2018 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is a Linux-specific part of spinlock_wait.cc
#include <linux/futex.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <atomic>
#include <climits>
#include <cstdint>
#include <ctime>
#include "absl/base/attributes.h"
#include "absl/base/internal/errno_saver.h"
// The SpinLock lockword is `std::atomic<uint32_t>`. Here we assert that
// `std::atomic<uint32_t>` is bitwise equivalent of the `int` expected
// by SYS_futex. We also assume that reads/writes done to the lockword
// by SYS_futex have rational semantics with regard to the
// std::atomic<> API. C++ provides no guarantees of these assumptions,
// but they are believed to hold in practice.
static_assert(sizeof(std::atomic<uint32_t>) == sizeof(int),
"SpinLock lockword has the wrong size for a futex");
// Some Android headers are missing these definitions even though they
// support these futex operations.
#ifdef __BIONIC__
#ifndef SYS_futex
#define SYS_futex __NR_futex
#endif
#ifndef FUTEX_PRIVATE_FLAG
#define FUTEX_PRIVATE_FLAG 128
#endif
#endif
#if defined(__NR_futex_time64) && !defined(SYS_futex_time64)
#define SYS_futex_time64 __NR_futex_time64
#endif
#if defined(SYS_futex_time64) && !defined(SYS_futex)
#define SYS_futex SYS_futex_time64
#endif
extern "C" {
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
std::atomic<uint32_t> *w, uint32_t value, int,
absl::base_internal::SchedulingMode) {
absl::base_internal::ErrnoSaver errno_saver;
syscall(SYS_futex, w, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, value, nullptr);
}
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(
std::atomic<uint32_t> *w, bool all) {
syscall(SYS_futex, w, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, all ? INT_MAX : 1, 0);
}
} // extern "C"

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is a Posix-specific part of spinlock_wait.cc
#include <sched.h>
#include <atomic>
#include <ctime>
#include "absl/base/internal/errno_saver.h"
#include "absl/base/internal/scheduling_mode.h"
#include "absl/base/port.h"
extern "C" {
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
absl::base_internal::SchedulingMode /* mode */) {
absl::base_internal::ErrnoSaver errno_saver;
if (loop == 0) {
} else if (loop == 1) {
sched_yield();
} else {
struct timespec tm;
tm.tv_sec = 0;
tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
nanosleep(&tm, nullptr);
}
}
ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(
std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
} // extern "C"

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// The OS-specific header included below must provide two calls:
// AbslInternalSpinLockDelay() and AbslInternalSpinLockWake().
// See spinlock_wait.h for the specs.
#include <atomic>
#include <cstdint>
#include "absl/base/internal/spinlock_wait.h"
#if defined(_WIN32)
#include "absl/base/internal/spinlock_win32.inc"
#elif defined(__linux__)
#include "absl/base/internal/spinlock_linux.inc"
#elif defined(__akaros__)
#include "absl/base/internal/spinlock_akaros.inc"
#else
#include "absl/base/internal/spinlock_posix.inc"
#endif
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// See spinlock_wait.h for spec.
uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
const SpinLockWaitTransition trans[],
base_internal::SchedulingMode scheduling_mode) {
int loop = 0;
for (;;) {
uint32_t v = w->load(std::memory_order_acquire);
int i;
for (i = 0; i != n && v != trans[i].from; i++) {
}
if (i == n) {
SpinLockDelay(w, v, ++loop, scheduling_mode); // no matching transition
} else if (trans[i].to == v || // null transition
w->compare_exchange_strong(v, trans[i].to,
std::memory_order_acquire,
std::memory_order_relaxed)) {
if (trans[i].done) return v;
}
}
}
static std::atomic<uint64_t> delay_rand;
// Return a suggested delay in nanoseconds for iteration number "loop"
int SpinLockSuggestedDelayNS(int loop) {
// Weak pseudo-random number generator to get some spread between threads
// when many are spinning.
uint64_t r = delay_rand.load(std::memory_order_relaxed);
r = 0x5deece66dLL * r + 0xb; // numbers from nrand48()
delay_rand.store(r, std::memory_order_relaxed);
if (loop < 0 || loop > 32) { // limit loop to 0..32
loop = 32;
}
const int kMinDelay = 128 << 10; // 128us
// Double delay every 8 iterations, up to 16x (2ms).
int delay = kMinDelay << (loop / 8);
// Randomize in delay..2*delay range, for resulting 128us..4ms range.
return delay | ((delay - 1) & static_cast<int>(r));
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
#define ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_
// Operations to make atomic transitions on a word, and to allow
// waiting for those transitions to become possible.
#include <stdint.h>
#include <atomic>
#include "absl/base/internal/scheduling_mode.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// SpinLockWait() waits until it can perform one of several transitions from
// "from" to "to". It returns when it performs a transition where done==true.
struct SpinLockWaitTransition {
uint32_t from;
uint32_t to;
bool done;
};
// Wait until *w can transition from trans[i].from to trans[i].to for some i
// satisfying 0<=i<n && trans[i].done, atomically make the transition,
// then return the old value of *w. Make any other atomic transitions
// where !trans[i].done, but continue waiting.
//
// Wakeups for threads blocked on SpinLockWait do not respect priorities.
uint32_t SpinLockWait(std::atomic<uint32_t> *w, int n,
const SpinLockWaitTransition trans[],
SchedulingMode scheduling_mode);
// If possible, wake some thread that has called SpinLockDelay(w, ...). If `all`
// is true, wake all such threads. On some systems, this may be a no-op; on
// those systems, threads calling SpinLockDelay() will always wake eventually
// even if SpinLockWake() is never called.
void SpinLockWake(std::atomic<uint32_t> *w, bool all);
// Wait for an appropriate spin delay on iteration "loop" of a
// spin loop on location *w, whose previously observed value was "value".
// SpinLockDelay() may do nothing, may yield the CPU, may sleep a clock tick,
// or may wait for a call to SpinLockWake(w).
void SpinLockDelay(std::atomic<uint32_t> *w, uint32_t value, int loop,
base_internal::SchedulingMode scheduling_mode);
// Helper used by AbslInternalSpinLockDelay.
// Returns a suggested delay in nanoseconds for iteration number "loop".
int SpinLockSuggestedDelayNS(int loop);
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
// In some build configurations we pass --detect-odr-violations to the
// gold linker. This causes it to flag weak symbol overrides as ODR
// violations. Because ODR only applies to C++ and not C,
// --detect-odr-violations ignores symbols not mangled with C++ names.
// By changing our extension points to be extern "C", we dodge this
// check.
extern "C" {
void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(std::atomic<uint32_t> *w,
bool all);
void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
std::atomic<uint32_t> *w, uint32_t value, int loop,
absl::base_internal::SchedulingMode scheduling_mode);
}
inline void absl::base_internal::SpinLockWake(std::atomic<uint32_t> *w,
bool all) {
ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(w, all);
}
inline void absl::base_internal::SpinLockDelay(
std::atomic<uint32_t> *w, uint32_t value, int loop,
absl::base_internal::SchedulingMode scheduling_mode) {
ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)
(w, value, loop, scheduling_mode);
}
#endif // ABSL_BASE_INTERNAL_SPINLOCK_WAIT_H_

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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is a Win32-specific part of spinlock_wait.cc
#include <windows.h>
#include <atomic>
#include "absl/base/internal/scheduling_mode.h"
extern "C" {
void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
absl::base_internal::SchedulingMode /* mode */) {
if (loop == 0) {
} else if (loop == 1) {
Sleep(0);
} else {
// SpinLockSuggestedDelayNS() always returns a positive integer, so this
// static_cast is safe.
Sleep(static_cast<DWORD>(
absl::base_internal::SpinLockSuggestedDelayNS(loop) / 1000000));
}
}
void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(
std::atomic<uint32_t>* /* lock_word */, bool /* all */) {}
} // extern "C"

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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/base/internal/strerror.h"
#include <array>
#include <cerrno>
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <string>
#include <type_traits>
#include "absl/base/internal/errno_saver.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
namespace {
const char* StrErrorAdaptor(int errnum, char* buf, size_t buflen) {
#if defined(_WIN32)
int rc = strerror_s(buf, buflen, errnum);
buf[buflen - 1] = '\0'; // guarantee NUL termination
if (rc == 0 && strncmp(buf, "Unknown error", buflen) == 0) *buf = '\0';
return buf;
#else
// The type of `ret` is platform-specific; both of these branches must compile
// either way but only one will execute on any given platform:
auto ret = strerror_r(errnum, buf, buflen);
if (std::is_same<decltype(ret), int>::value) {
// XSI `strerror_r`; `ret` is `int`:
if (ret) *buf = '\0';
return buf;
} else {
// GNU `strerror_r`; `ret` is `char *`:
return reinterpret_cast<const char*>(ret);
}
#endif
}
std::string StrErrorInternal(int errnum) {
char buf[100];
const char* str = StrErrorAdaptor(errnum, buf, sizeof buf);
if (*str == '\0') {
snprintf(buf, sizeof buf, "Unknown error %d", errnum);
str = buf;
}
return str;
}
// kSysNerr is the number of errors from a recent glibc. `StrError()` falls back
// to `StrErrorAdaptor()` if the value is larger than this.
constexpr int kSysNerr = 135;
std::array<std::string, kSysNerr>* NewStrErrorTable() {
auto* table = new std::array<std::string, kSysNerr>;
for (size_t i = 0; i < table->size(); ++i) {
(*table)[i] = StrErrorInternal(static_cast<int>(i));
}
return table;
}
} // namespace
std::string StrError(int errnum) {
absl::base_internal::ErrnoSaver errno_saver;
static const auto* table = NewStrErrorTable();
if (errnum >= 0 && static_cast<size_t>(errnum) < table->size()) {
return (*table)[static_cast<size_t>(errnum)];
}
return StrErrorInternal(errnum);
}
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl

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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ABSL_BASE_INTERNAL_STRERROR_H_
#define ABSL_BASE_INTERNAL_STRERROR_H_
#include <string>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace base_internal {
// A portable and thread-safe alternative to C89's `strerror`.
//
// The C89 specification of `strerror` is not suitable for use in a
// multi-threaded application as the returned string may be changed by calls to
// `strerror` from another thread. The many non-stdlib alternatives differ
// enough in their names, availability, and semantics to justify this wrapper
// around them. `errno` will not be modified by a call to `absl::StrError`.
std::string StrError(int errnum);
} // namespace base_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_BASE_INTERNAL_STRERROR_H_

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