46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
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// Copyright 2022 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_
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#define INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_
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#include "cppgc/heap-handle.h"
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#include "cppgc/internal/api-constants.h"
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#include "cppgc/internal/logging.h"
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace cppgc {
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namespace internal {
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// The class is needed in the header to allow for fast access to HeapHandle in
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// the write barrier.
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class BasePageHandle {
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public:
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static V8_INLINE BasePageHandle* FromPayload(void* payload) {
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return reinterpret_cast<BasePageHandle*>(
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(reinterpret_cast<uintptr_t>(payload) &
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~(api_constants::kPageSize - 1)) +
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api_constants::kGuardPageSize);
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}
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static V8_INLINE const BasePageHandle* FromPayload(const void* payload) {
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return FromPayload(const_cast<void*>(payload));
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}
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HeapHandle& heap_handle() { return heap_handle_; }
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const HeapHandle& heap_handle() const { return heap_handle_; }
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protected:
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explicit BasePageHandle(HeapHandle& heap_handle) : heap_handle_(heap_handle) {
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CPPGC_DCHECK(reinterpret_cast<uintptr_t>(this) % api_constants::kPageSize ==
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api_constants::kGuardPageSize);
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}
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HeapHandle& heap_handle_;
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};
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} // namespace internal
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} // namespace cppgc
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#endif // INCLUDE_CPPGC_INTERNAL_BASE_PAGE_HANDLE_H_
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