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// Copyright 2019 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.
#include "src/heap/basic-memory-chunk.h"
#include <cstdlib>
#include "src/heap/heap-write-barrier-inl.h"
#include "src/objects/heap-object.h"
#include "src/objects/slots-inl.h"
namespace v8 {
namespace internal {
// Verify write barrier offsets match the the real offsets.
STATIC_ASSERT(BasicMemoryChunk::Flag::INCREMENTAL_MARKING ==
heap_internals::MemoryChunk::kMarkingBit);
STATIC_ASSERT(BasicMemoryChunk::Flag::FROM_PAGE ==
heap_internals::MemoryChunk::kFromPageBit);
STATIC_ASSERT(BasicMemoryChunk::Flag::TO_PAGE ==
heap_internals::MemoryChunk::kToPageBit);
STATIC_ASSERT(BasicMemoryChunk::kFlagsOffset ==
heap_internals::MemoryChunk::kFlagsOffset);
STATIC_ASSERT(BasicMemoryChunk::kHeapOffset ==
heap_internals::MemoryChunk::kHeapOffset);
BasicMemoryChunk::BasicMemoryChunk(size_t size, Address area_start,
Address area_end) {
const Address base = reinterpret_cast<Address>(this);
size_ = size;
marking_bitmap_ = static_cast<Bitmap*>(calloc(1, Bitmap::kSize));
header_sentinel_ = HeapObject::FromAddress(base).ptr();
DCHECK(HasHeaderSentinel(area_start));
area_start_ = area_start;
area_end_ = area_end;
}
// static
bool BasicMemoryChunk::HasHeaderSentinel(Address slot_addr) {
Address base = BaseAddress(slot_addr);
if (slot_addr < base + kHeaderSize) return false;
return HeapObject::FromAddress(base) ==
ObjectSlot(base + kHeaderSentinelOffset).Relaxed_Load();
}
void BasicMemoryChunk::ReleaseMarkingBitmap() {
DCHECK_NOT_NULL(marking_bitmap_);
free(marking_bitmap_);
marking_bitmap_ = nullptr;
}
} // namespace internal
} // namespace v8