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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_CPPGC_SWEEPER_H_
#define V8_HEAP_CPPGC_SWEEPER_H_
#include <memory>
#include "include/cppgc/heap.h"
#include "src/base/macros.h"
#include "src/base/platform/time.h"
#include "src/heap/cppgc/memory.h"
namespace cppgc {
class Platform;
namespace internal {
class HeapBase;
class ConcurrentSweeperTest;
class NormalPageSpace;
class V8_EXPORT_PRIVATE Sweeper final {
public:
struct SweepingConfig {
using SweepingType = cppgc::Heap::SweepingType;
enum class CompactableSpaceHandling { kSweep, kIgnore };
enum class FreeMemoryHandling { kDoNotDiscard, kDiscardWherePossible };
SweepingType sweeping_type = SweepingType::kIncrementalAndConcurrent;
CompactableSpaceHandling compactable_space_handling =
CompactableSpaceHandling::kSweep;
FreeMemoryHandling free_memory_handling = FreeMemoryHandling::kDoNotDiscard;
};
static constexpr bool CanDiscardMemory() {
return CheckMemoryIsInaccessibleIsNoop();
}
explicit Sweeper(HeapBase&);
~Sweeper();
Sweeper(const Sweeper&) = delete;
Sweeper& operator=(const Sweeper&) = delete;
// Sweeper::Start assumes the heap holds no linear allocation buffers.
void Start(SweepingConfig);
void FinishIfRunning();
void NotifyDoneIfNeeded();
// SweepForAllocationIfRunning sweeps the given |space| until a slot that can
// fit an allocation of size |size| is found. Returns true if a slot was
// found.
bool SweepForAllocationIfRunning(NormalPageSpace* space, size_t size);
bool IsSweepingOnMutatorThread() const;
bool IsSweepingInProgress() const;
// Assist with sweeping. Returns true if sweeping is done.
bool PerformSweepOnMutatorThread(double deadline_in_seconds);
private:
void WaitForConcurrentSweepingForTesting();
class SweeperImpl;
HeapBase& heap_;
std::unique_ptr<SweeperImpl> impl_;
friend class ConcurrentSweeperTest;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_SWEEPER_H_
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