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// Copyright 2014 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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//
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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.
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.
Tagged<AllocationMemento> memento = AllocationMemento::unchecked_cast(
Tagged<Object>(heap->NewSpaceTop() + kHeapObjectTag));
memento->set_map_after_allocation(
ReadOnlyRoots(heap).allocation_memento_map(), SKIP_WRITE_BARRIER);
// Using this accessor because set_memento expects an Object and not a
// MaybeObject.
TaggedField<MaybeObject, AllocationMemento::kAllocationSiteOffset>::store(
memento, MaybeObject(kHeapObjectTag));
}
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(Regress470390) {
#ifdef VERIFY_HEAP
// With MinorMS, 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_ms) 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::heap()->NewSpaceTop();
*(CcTest::heap()->NewSpaceAllocationLimitAddress()) = top;
// 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
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