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"

namespace v8 {
namespace internal {

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

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

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

  // Create an allocation memento behind the string with a garbage allocation
  // site pointer.
  AllocationMemento memento = AllocationMemento::unchecked_cast(
      Object(new_space->top() + kHeapObjectTag));
  memento.set_map_after_allocation(ReadOnlyRoots(heap).allocation_memento_map(),
                                   SKIP_WRITE_BARRIER);
  memento.set_allocation_site(
      AllocationSite::unchecked_cast(Object(kHeapObjectTag)),
      SKIP_WRITE_BARRIER);
}


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.
  CcTest::PreciseCollectAllGarbage();
}


TEST(Regress470390) {
#ifdef VERIFY_HEAP
  // With MinorMC, we may have object allocated after `new_space->top()`. If the
  // next object after `new_space->top()` is an invalid memento, heap
  // verification should fail.
  if (v8_flags.minor_mc) return;
#endif  // VERIFY_HEAP

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

  SetUpNewSpaceWithPoisonedMementoAtTop();

  // Set the new space limit to be equal to the top.
  Address top = CcTest::i_isolate()->heap()->new_space()->top();
  *(CcTest::i_isolate()->heap()->new_space()->allocation_limit_address()) = top;

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


TEST(BadMementoAfterTopForceScavenge) {
  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
  CcTest::CollectGarbage(i::NEW_SPACE);
}

}  // namespace internal
}  // namespace v8