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basic-memory-chunk.cc
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122 lines (107 loc) · 4.59 KB
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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/heap/incremental-marking.h"
#include "src/objects/heap-object.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);
// static
constexpr BasicMemoryChunk::MainThreadFlags BasicMemoryChunk::kAllFlagsMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags
BasicMemoryChunk::kPointersToHereAreInterestingMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags
BasicMemoryChunk::kPointersFromHereAreInterestingMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags
BasicMemoryChunk::kEvacuationCandidateMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags
BasicMemoryChunk::kIsInYoungGenerationMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags BasicMemoryChunk::kIsLargePageMask;
// static
constexpr BasicMemoryChunk::MainThreadFlags
BasicMemoryChunk::kSkipEvacuationSlotsRecordingMask;
BasicMemoryChunk::BasicMemoryChunk(size_t size, Address area_start,
Address area_end) {
size_ = size;
area_start_ = area_start;
area_end_ = area_end;
}
// static
BasicMemoryChunk* BasicMemoryChunk::Initialize(Heap* heap, Address base,
size_t size, Address area_start,
Address area_end,
BaseSpace* owner,
VirtualMemory reservation) {
BasicMemoryChunk* chunk = FromAddress(base);
DCHECK_EQ(base, chunk->address());
new (chunk) BasicMemoryChunk(size, area_start, area_end);
chunk->heap_ = heap;
chunk->set_owner(owner);
chunk->reservation_ = std::move(reservation);
chunk->high_water_mark_ = static_cast<intptr_t>(area_start - base);
chunk->allocated_bytes_ = chunk->area_size();
chunk->wasted_memory_ = 0;
chunk->marking_bitmap<AccessMode::NON_ATOMIC>()->Clear();
return chunk;
}
bool BasicMemoryChunk::InOldSpace() const {
return owner()->identity() == OLD_SPACE;
}
bool BasicMemoryChunk::InLargeObjectSpace() const {
return owner()->identity() == LO_SPACE;
}
#ifdef THREAD_SANITIZER
void BasicMemoryChunk::SynchronizedHeapLoad() const {
CHECK(reinterpret_cast<Heap*>(
base::Acquire_Load(reinterpret_cast<base::AtomicWord*>(
&(const_cast<BasicMemoryChunk*>(this)->heap_)))) != nullptr ||
InReadOnlySpaceRaw());
}
#endif
class BasicMemoryChunkValidator {
// Computed offsets should match the compiler generated ones.
STATIC_ASSERT(BasicMemoryChunk::kSizeOffset ==
offsetof(BasicMemoryChunk, size_));
STATIC_ASSERT(BasicMemoryChunk::kFlagsOffset ==
offsetof(BasicMemoryChunk, main_thread_flags_));
STATIC_ASSERT(BasicMemoryChunk::kHeapOffset ==
offsetof(BasicMemoryChunk, heap_));
STATIC_ASSERT(offsetof(BasicMemoryChunk, size_) ==
MemoryChunkLayout::kSizeOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, heap_) ==
MemoryChunkLayout::kHeapOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, area_start_) ==
MemoryChunkLayout::kAreaStartOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, area_end_) ==
MemoryChunkLayout::kAreaEndOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, allocated_bytes_) ==
MemoryChunkLayout::kAllocatedBytesOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, wasted_memory_) ==
MemoryChunkLayout::kWastedMemoryOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, high_water_mark_) ==
MemoryChunkLayout::kHighWaterMarkOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, owner_) ==
MemoryChunkLayout::kOwnerOffset);
STATIC_ASSERT(offsetof(BasicMemoryChunk, reservation_) ==
MemoryChunkLayout::kReservationOffset);
};
} // namespace internal
} // namespace v8