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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 "src/base/macros.h"
#include "src/base/platform/time.h"
#include "src/heap/cppgc/heap-config.h"
#include "src/heap/cppgc/memory.h"
#include "src/heap/cppgc/stats-collector.h"
namespace cppgc::internal {
class HeapBase;
class ConcurrentSweeperTest;
class NormalPageSpace;
class V8_EXPORT_PRIVATE Sweeper final {
public:
class V8_EXPORT_PRIVATE SweepingOnMutatorThreadObserver {
public:
explicit SweepingOnMutatorThreadObserver(Sweeper&);
virtual ~SweepingOnMutatorThreadObserver();
virtual void Start() = 0;
virtual void End() = 0;
private:
Sweeper& sweeper_;
};
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);
// Returns true when sweeping was finished and false if it was not running or
// couldn't be finished due to being a recursive sweep call.
bool FinishIfRunning();
void FinishIfOutOfWork();
void NotifyDoneIfNeeded();
// SweepForAllocationIfRunning sweeps the given `space` until a slot that can
// fit an allocation of `min_wanted_size` bytes is found. Returns true if a
// slot was found. Aborts after `max_duration`.
bool SweepForAllocationIfRunning(NormalPageSpace* space,
size_t min_wanted_size,
v8::base::TimeDelta max_duration);
bool IsSweepingOnMutatorThread() const;
bool IsSweepingInProgress() const;
// Assist with sweeping. Returns true if sweeping is done.
bool PerformSweepOnMutatorThread(v8::base::TimeDelta max_duration,
StatsCollector::ScopeId);
private:
void WaitForConcurrentSweepingForTesting();
class SweeperImpl;
HeapBase& heap_;
std::unique_ptr<SweeperImpl> impl_;
friend class ConcurrentSweeperTest;
};
} // namespace cppgc::internal
#endif // V8_HEAP_CPPGC_SWEEPER_H_
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