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// Copyright 2012 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.
#ifndef V8_HEAP_MARK_COMPACT_INL_H_
#define V8_HEAP_MARK_COMPACT_INL_H_
#include "src/heap/mark-compact.h"
#include "src/heap/slots-buffer.h"
#include "src/isolate.h"
namespace v8 {
namespace internal {
void MarkCompactCollector::PushBlack(HeapObject* obj) {
DCHECK(Marking::IsBlack(Marking::MarkBitFrom(obj)));
if (marking_deque_.Push(obj)) {
MemoryChunk::IncrementLiveBytesFromGC(obj, obj->Size());
} else {
Marking::BlackToGrey(obj);
}
}
void MarkCompactCollector::UnshiftBlack(HeapObject* obj) {
DCHECK(Marking::IsBlack(Marking::MarkBitFrom(obj)));
if (!marking_deque_.Unshift(obj)) {
MemoryChunk::IncrementLiveBytesFromGC(obj, -obj->Size());
Marking::BlackToGrey(obj);
}
}
void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
DCHECK(Marking::MarkBitFrom(obj) == mark_bit);
if (Marking::IsWhite(mark_bit)) {
Marking::WhiteToBlack(mark_bit);
DCHECK(obj->GetIsolate()->heap()->Contains(obj));
PushBlack(obj);
}
}
void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
DCHECK(Marking::IsWhite(mark_bit));
DCHECK(Marking::MarkBitFrom(obj) == mark_bit);
Marking::WhiteToBlack(mark_bit);
MemoryChunk::IncrementLiveBytesFromGC(obj, obj->Size());
}
bool MarkCompactCollector::IsMarked(Object* obj) {
DCHECK(obj->IsHeapObject());
HeapObject* heap_object = HeapObject::cast(obj);
return Marking::IsBlackOrGrey(Marking::MarkBitFrom(heap_object));
}
void MarkCompactCollector::RecordSlot(HeapObject* object, Object** slot,
Object* target) {
Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
if (target_page->IsEvacuationCandidate() &&
!ShouldSkipEvacuationSlotRecording(object)) {
if (!SlotsBuffer::AddTo(slots_buffer_allocator_,
target_page->slots_buffer_address(), slot,
SlotsBuffer::FAIL_ON_OVERFLOW)) {
EvictPopularEvacuationCandidate(target_page);
}
}
}
void MarkCompactCollector::ForceRecordSlot(HeapObject* object, Object** slot,
Object* target) {
Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
if (target_page->IsEvacuationCandidate() &&
!ShouldSkipEvacuationSlotRecording(object)) {
CHECK(SlotsBuffer::AddTo(slots_buffer_allocator_,
target_page->slots_buffer_address(), slot,
SlotsBuffer::IGNORE_OVERFLOW));
}
}
void CodeFlusher::AddCandidate(SharedFunctionInfo* shared_info) {
if (GetNextCandidate(shared_info) == NULL) {
SetNextCandidate(shared_info, shared_function_info_candidates_head_);
shared_function_info_candidates_head_ = shared_info;
}
}
void CodeFlusher::AddCandidate(JSFunction* function) {
DCHECK(function->code() == function->shared()->code());
if (GetNextCandidate(function)->IsUndefined()) {
SetNextCandidate(function, jsfunction_candidates_head_);
jsfunction_candidates_head_ = function;
}
}
JSFunction** CodeFlusher::GetNextCandidateSlot(JSFunction* candidate) {
return reinterpret_cast<JSFunction**>(
HeapObject::RawField(candidate, JSFunction::kNextFunctionLinkOffset));
}
JSFunction* CodeFlusher::GetNextCandidate(JSFunction* candidate) {
Object* next_candidate = candidate->next_function_link();
return reinterpret_cast<JSFunction*>(next_candidate);
}
void CodeFlusher::SetNextCandidate(JSFunction* candidate,
JSFunction* next_candidate) {
candidate->set_next_function_link(next_candidate, UPDATE_WEAK_WRITE_BARRIER);
}
void CodeFlusher::ClearNextCandidate(JSFunction* candidate, Object* undefined) {
DCHECK(undefined->IsUndefined());
candidate->set_next_function_link(undefined, SKIP_WRITE_BARRIER);
}
SharedFunctionInfo* CodeFlusher::GetNextCandidate(
SharedFunctionInfo* candidate) {
Object* next_candidate = candidate->code()->gc_metadata();
return reinterpret_cast<SharedFunctionInfo*>(next_candidate);
}
void CodeFlusher::SetNextCandidate(SharedFunctionInfo* candidate,
SharedFunctionInfo* next_candidate) {
candidate->code()->set_gc_metadata(next_candidate);
}
void CodeFlusher::ClearNextCandidate(SharedFunctionInfo* candidate) {
candidate->code()->set_gc_metadata(NULL, SKIP_WRITE_BARRIER);
}
} // namespace internal
} // namespace v8
#endif // V8_HEAP_MARK_COMPACT_INL_H_
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