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// Copyright 2021 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 INCLUDE_CPPGC_HEAP_STATE_H_
#define INCLUDE_CPPGC_HEAP_STATE_H_
#include "v8config.h" // NOLINT(build/include_directory)
namespace cppgc {
class HeapHandle;
namespace subtle {
/**
* Helpers to peek into heap-internal state.
*/
class V8_EXPORT HeapState final {
public:
/**
* Returns whether the garbage collector is marking. This API is experimental
* and is expected to be removed in future.
*
* \param heap_handle The corresponding heap.
* \returns true if the garbage collector is currently marking, and false
* otherwise.
*/
static bool IsMarking(const HeapHandle& heap_handle);
/*
* Returns whether the garbage collector is sweeping. This API is experimental
* and is expected to be removed in future.
*
* \param heap_handle The corresponding heap.
* \returns true if the garbage collector is currently sweeping, and false
* otherwise.
*/
static bool IsSweeping(const HeapHandle& heap_handle);
/*
* Returns whether the garbage collector is currently sweeping on the thread
* owning this heap. This API allows the caller to determine whether it has
* been called from a destructor of a managed object. This API is experimental
* and may be removed in future.
*
* \param heap_handle The corresponding heap.
* \returns true if the garbage collector is currently sweeping on this
* thread, and false otherwise.
*/
static bool IsSweepingOnOwningThread(const HeapHandle& heap_handle);
/**
* Returns whether the garbage collector is in the atomic pause, i.e., the
* mutator is stopped from running. This API is experimental and is expected
* to be removed in future.
*
* \param heap_handle The corresponding heap.
* \returns true if the garbage collector is currently in the atomic pause,
* and false otherwise.
*/
static bool IsInAtomicPause(const HeapHandle& heap_handle);
/**
* Returns whether the last garbage collection was finalized conservatively
* (i.e., with a non-empty stack). This API is experimental and is expected to
* be removed in future.
*
* \param heap_handle The corresponding heap.
* \returns true if the last garbage collection was finalized conservatively,
* and false otherwise.
*/
static bool PreviousGCWasConservative(const HeapHandle& heap_handle);
private:
HeapState() = delete;
};
} // namespace subtle
} // namespace cppgc
#endif // INCLUDE_CPPGC_HEAP_STATE_H_
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