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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// TODO(mythria): Remove this define after this flag is turned on globally
#define V8_IMMINENT_DEPRECATION_WARNINGS
#include "src/heap/slots-buffer.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
TEST(SlotsBufferObjectSlotsRemoval) {
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
Factory* factory = isolate->factory();
SlotsBuffer* buffer = new SlotsBuffer(NULL);
void* fake_object[1];
Handle<FixedArray> array = factory->NewFixedArray(2, TENURED);
CHECK(heap->old_space()->Contains(*array));
array->set(0, reinterpret_cast<Object*>(fake_object), SKIP_WRITE_BARRIER);
// Firstly, let's test the regular slots buffer entry.
buffer->Add(HeapObject::RawField(*array, FixedArray::kHeaderSize));
CHECK(reinterpret_cast<void*>(buffer->Get(0)) ==
HeapObject::RawField(*array, FixedArray::kHeaderSize));
SlotsBuffer::RemoveObjectSlots(CcTest::i_isolate()->heap(), buffer,
array->address(),
array->address() + array->Size());
CHECK(reinterpret_cast<void*>(buffer->Get(0)) ==
HeapObject::RawField(heap->empty_fixed_array(),
FixedArrayBase::kLengthOffset));
// Secondly, let's test the typed slots buffer entry.
SlotsBuffer::AddTo(NULL, &buffer, SlotsBuffer::EMBEDDED_OBJECT_SLOT,
array->address() + FixedArray::kHeaderSize,
SlotsBuffer::FAIL_ON_OVERFLOW);
CHECK(reinterpret_cast<void*>(buffer->Get(1)) ==
reinterpret_cast<Object**>(SlotsBuffer::EMBEDDED_OBJECT_SLOT));
CHECK(reinterpret_cast<void*>(buffer->Get(2)) ==
HeapObject::RawField(*array, FixedArray::kHeaderSize));
SlotsBuffer::RemoveObjectSlots(CcTest::i_isolate()->heap(), buffer,
array->address(),
array->address() + array->Size());
CHECK(reinterpret_cast<void*>(buffer->Get(1)) ==
HeapObject::RawField(heap->empty_fixed_array(),
FixedArrayBase::kLengthOffset));
CHECK(reinterpret_cast<void*>(buffer->Get(2)) ==
HeapObject::RawField(heap->empty_fixed_array(),
FixedArrayBase::kLengthOffset));
delete buffer;
}
TEST(FilterInvalidSlotsBufferEntries) {
FLAG_manual_evacuation_candidates_selection = true;
CcTest::InitializeVM();
v8::HandleScope scope(CcTest::isolate());
Isolate* isolate = CcTest::i_isolate();
Heap* heap = isolate->heap();
Factory* factory = isolate->factory();
SlotsBuffer* buffer = new SlotsBuffer(NULL);
// Set up a fake black object that will contain a recorded SMI, a recorded
// pointer to a new space object, and a recorded pointer to a non-evacuation
// candidate object. These object should be filtered out. Additionally,
// we point to an evacuation candidate object which should not be filtered
// out.
// Create fake object and mark it black.
Handle<FixedArray> fake_object = factory->NewFixedArray(23, TENURED);
MarkBit mark_bit = Marking::MarkBitFrom(*fake_object);
Marking::MarkBlack(mark_bit);
// Write a SMI into field one and record its address;
Object** field_smi = fake_object->RawFieldOfElementAt(0);
*field_smi = Smi::FromInt(100);
buffer->Add(field_smi);
// Write a new space reference into field 2 and record its address;
Handle<FixedArray> new_space_object = factory->NewFixedArray(23);
mark_bit = Marking::MarkBitFrom(*new_space_object);
Marking::MarkBlack(mark_bit);
Object** field_new_space = fake_object->RawFieldOfElementAt(1);
*field_new_space = *new_space_object;
buffer->Add(field_new_space);
// Write an old space reference into field 3 which points to an object not on
// an evacuation candidate.
Handle<FixedArray> old_space_object_non_evacuation =
factory->NewFixedArray(23, TENURED);
mark_bit = Marking::MarkBitFrom(*old_space_object_non_evacuation);
Marking::MarkBlack(mark_bit);
Object** field_old_space_object_non_evacuation =
fake_object->RawFieldOfElementAt(2);
*field_old_space_object_non_evacuation = *old_space_object_non_evacuation;
buffer->Add(field_old_space_object_non_evacuation);
// Write an old space reference into field 4 which points to an object on an
// evacuation candidate.
SimulateFullSpace(heap->old_space());
Handle<FixedArray> valid_object =
isolate->factory()->NewFixedArray(23, TENURED);
Page* page = Page::FromAddress(valid_object->address());
page->SetFlag(MemoryChunk::EVACUATION_CANDIDATE);
Object** valid_field = fake_object->RawFieldOfElementAt(3);
*valid_field = *valid_object;
buffer->Add(valid_field);
SlotsBuffer::RemoveInvalidSlots(heap, buffer);
Object** kRemovedEntry = HeapObject::RawField(heap->empty_fixed_array(),
FixedArrayBase::kLengthOffset);
CHECK_EQ(buffer->Get(0), kRemovedEntry);
CHECK_EQ(buffer->Get(1), kRemovedEntry);
CHECK_EQ(buffer->Get(2), kRemovedEntry);
CHECK_EQ(buffer->Get(3), valid_field);
// Clean-up to make verify heap happy.
mark_bit = Marking::MarkBitFrom(*fake_object);
Marking::MarkWhite(mark_bit);
mark_bit = Marking::MarkBitFrom(*new_space_object);
Marking::MarkWhite(mark_bit);
mark_bit = Marking::MarkBitFrom(*old_space_object_non_evacuation);
Marking::MarkWhite(mark_bit);
delete buffer;
}
} // namespace internal
} // namespace v8
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