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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_GC_INVOKER_H_
#define V8_HEAP_CPPGC_GC_INVOKER_H_
#include "include/cppgc/heap.h"
#include "src/base/macros.h"
#include "src/heap/cppgc/garbage-collector.h"
namespace cppgc {
class Platform;
namespace internal {
// GC invoker that dispatches GC depending on StackSupport and StackState:
// 1. If StackState specifies no stack scan needed the GC is invoked
// synchronously.
// 2. If StackState specifies conservative GC and StackSupport prohibits stack
// scanning: Delay GC until it can be invoked without accessing the stack.
// To do so, a precise GC without stack scan is scheduled using the platform
// if non-nestable tasks are supported, and otherwise no operation is carried
// out. This means that the heuristics allows to arbitrary go over the limit
// in case non-nestable tasks are not supported and only conservative GCs are
// requested.
class V8_EXPORT_PRIVATE GCInvoker final : public GarbageCollector {
public:
GCInvoker(GarbageCollector*, cppgc::Platform*, cppgc::Heap::StackSupport);
~GCInvoker();
GCInvoker(const GCInvoker&) = delete;
GCInvoker& operator=(const GCInvoker&) = delete;
void CollectGarbage(GarbageCollector::Config) final;
void StartIncrementalGarbageCollection(GarbageCollector::Config) final;
size_t epoch() const final;
private:
class GCInvokerImpl;
std::unique_ptr<GCInvokerImpl> impl_;
};
} // namespace internal
} // namespace cppgc
#endif // V8_HEAP_CPPGC_GC_INVOKER_H_
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