// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_HEAP_LOCAL_ALLOCATOR_H_
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#define V8_HEAP_LOCAL_ALLOCATOR_H_
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#include "src/globals.h"
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#include "src/heap/heap.h"
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#include "src/heap/spaces.h"
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namespace v8 {
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namespace internal {
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// Allocator encapsulating thread-local allocation. Assumes that all other
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// allocations also go through LocalAllocator.
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class LocalAllocator {
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public:
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static const int kLabSize = 32 * KB;
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static const int kMaxLabObjectSize = 8 * KB;
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explicit LocalAllocator(Heap* heap)
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: heap_(heap),
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new_space_(heap->new_space()),
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compaction_spaces_(heap),
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new_space_lab_(LocalAllocationBuffer::InvalidBuffer()),
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lab_allocation_will_fail_(false) {}
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// Needs to be called from the main thread to finalize this LocalAllocator.
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void Finalize() {
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heap_->old_space()->MergeCompactionSpace(compaction_spaces_.Get(OLD_SPACE));
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heap_->code_space()->MergeCompactionSpace(
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compaction_spaces_.Get(CODE_SPACE));
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// Give back remaining LAB space if this LocalAllocator's new space LAB
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// sits right next to new space allocation top.
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const LinearAllocationArea info = new_space_lab_.Close();
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const Address top = new_space_->top();
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if (info.limit() != kNullAddress && info.limit() == top) {
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DCHECK_NE(info.top(), kNullAddress);
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*new_space_->allocation_top_address() = info.top();
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}
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}
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inline AllocationResult Allocate(AllocationSpace space, int object_size,
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AllocationAlignment alignment);
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inline void FreeLast(AllocationSpace space, HeapObject* object,
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int object_size);
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private:
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inline AllocationResult AllocateInNewSpace(int object_size,
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AllocationAlignment alignment);
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inline bool NewLocalAllocationBuffer();
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inline AllocationResult AllocateInLAB(int object_size,
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AllocationAlignment alignment);
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inline void FreeLastInNewSpace(HeapObject* object, int object_size);
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inline void FreeLastInOldSpace(HeapObject* object, int object_size);
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Heap* const heap_;
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NewSpace* const new_space_;
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CompactionSpaceCollection compaction_spaces_;
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LocalAllocationBuffer new_space_lab_;
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bool lab_allocation_will_fail_;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_HEAP_LOCAL_ALLOCATOR_H_
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