Kmake/deps/v8/test/cctest/test-mementos.cc

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#include "src/execution/isolate.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h"
#include "src/objects/objects-inl.h"
#include "test/cctest/cctest.h"
#include "test/cctest/heap/heap-utils.h"

namespace v8 {
namespace internal {

static void SetUpNewSpaceWithPoisonedMementoAtTop() {
  Isolate* isolate = CcTest::i_isolate();
  Heap* heap = isolate->heap();

  // Make sure we can allocate some objects without causing a GC later.
  heap::InvokeMajorGC(heap);

  // Allocate a string, the GC may suspect a memento behind the string.
  DirectHandle<SeqOneByteString> string =
      isolate->factory()->NewRawOneByteString(12).ToHandleChecked();
  CHECK(!(*string).is_null());

  // Create an allocation memento behind the string with a garbage allocation
  // site pointer.
  Tagged<AllocationMemento> memento = UncheckedCast<AllocationMemento>(
      Tagged<Object>(heap->NewSpaceTop() + kHeapObjectTag));
  memento->set_map_after_allocation(
      isolate, ReadOnlyRoots(heap).allocation_memento_map(),
      SKIP_WRITE_BARRIER);

  // Using this accessor as we're writing an invalid tagged pointer.
  Tagged_t poison = kHeapObjectTag;
  memento->WriteField<Tagged_t>(AllocationMemento::kAllocationSiteOffset,
                                poison);
}


TEST(Regress340063) {
  CcTest::InitializeVM();
  if (!i::v8_flags.allocation_site_pretenuring || v8_flags.single_generation)
    return;
  v8::HandleScope scope(CcTest::isolate());

  SetUpNewSpaceWithPoisonedMementoAtTop();

  // Call GC to see if we can handle a poisonous memento right after the
  // current new space top pointer.
  i::heap::InvokeAtomicMajorGC(CcTest::heap());
}


TEST(BadMementoAfterTopForceMinorGC) {
  CcTest::InitializeVM();
  if (!i::v8_flags.allocation_site_pretenuring || v8_flags.single_generation)
    return;
  v8::HandleScope scope(CcTest::isolate());

  SetUpNewSpaceWithPoisonedMementoAtTop();

  // Force GC to test the poisoned memento handling
  i::heap::InvokeMinorGC(CcTest::heap());
}

}  // namespace internal
}  // namespace v8