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// Copyright 2020 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_CONCURRENT_ALLOCATOR_H_
#define V8_HEAP_CONCURRENT_ALLOCATOR_H_
#include "src/common/globals.h"
#include "src/heap/heap.h"
#include "src/heap/spaces.h"
#include "src/tasks/cancelable-task.h"
namespace v8 {
namespace internal {
class LocalHeap;
class StressConcurrentAllocatorTask : public CancelableTask {
public:
explicit StressConcurrentAllocatorTask(Isolate* isolate)
: CancelableTask(isolate), isolate_(isolate) {}
void RunInternal() override;
// Schedules task on background thread
static void Schedule(Isolate* isolate);
private:
Isolate* isolate_;
};
// Concurrent allocator for allocation from background threads/tasks.
// Allocations are served from a TLAB if possible.
class ConcurrentAllocator {
public:
static const int kLabSize = 4 * KB;
static const int kMaxLabSize = 32 * KB;
static const int kMaxLabObjectSize = 2 * KB;
explicit ConcurrentAllocator(LocalHeap* local_heap, PagedSpace* space)
: local_heap_(local_heap),
space_(space),
lab_(LocalAllocationBuffer::InvalidBuffer()) {}
inline AllocationResult Allocate(int object_size,
AllocationAlignment alignment,
AllocationOrigin origin);
inline Address AllocateOrFail(int object_size, AllocationAlignment alignment,
AllocationOrigin origin);
void FreeLinearAllocationArea();
void MakeLinearAllocationAreaIterable();
void MarkLinearAllocationAreaBlack();
void UnmarkLinearAllocationArea();
private:
inline bool EnsureLab(AllocationOrigin origin);
inline AllocationResult AllocateInLab(int object_size,
AllocationAlignment alignment,
AllocationOrigin origin);
V8_EXPORT_PRIVATE AllocationResult AllocateOutsideLab(
int object_size, AllocationAlignment alignment, AllocationOrigin origin);
V8_EXPORT_PRIVATE Address PerformCollectionAndAllocateAgain(
int object_size, AllocationAlignment alignment, AllocationOrigin origin);
LocalHeap* const local_heap_;
PagedSpace* const space_;
LocalAllocationBuffer lab_;
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_CONCURRENT_ALLOCATOR_H_
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