v8/test/cctest/test-mementos.cc

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#include "cctest.h"

using namespace v8::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.
  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);

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

  // Create an allocation memento behind the string with a garbage allocation
  // site pointer.
  AllocationMemento* memento =
      reinterpret_cast<AllocationMemento*>(new_space->top() + kHeapObjectTag);
  memento->set_map_no_write_barrier(heap->allocation_memento_map());
  memento->set_allocation_site(
      reinterpret_cast<AllocationSite*>(kHeapObjectTag), SKIP_WRITE_BARRIER);
}


TEST(Regress340063) {
  CcTest::InitializeVM();
  if (!i::FLAG_allocation_site_pretenuring) 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::i_isolate()->heap()->CollectAllGarbage(
      Heap::kAbortIncrementalMarkingMask);
}


TEST(BadMementoAfterTopForceScavenge) {
  CcTest::InitializeVM();
  if (!i::FLAG_allocation_site_pretenuring) return;
  v8::HandleScope scope(CcTest::isolate());

  SetUpNewSpaceWithPoisonedMementoAtTop();

  // Force GC to test the poisoned memento handling
  CcTest::i_isolate()->heap()->CollectGarbage(i::NEW_SPACE);
}