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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 INCLUDE_V8_CPPGC_H_
#define INCLUDE_V8_CPPGC_H_
#include <cstdint>
#include <memory>
#include <vector>
#include "cppgc/common.h"
#include "cppgc/custom-space.h"
#include "cppgc/heap-statistics.h"
#include "cppgc/visitor.h"
#include "v8-internal.h" // NOLINT(build/include_directory)
#include "v8-platform.h" // NOLINT(build/include_directory)
#include "v8-traced-handle.h" // NOLINT(build/include_directory)
namespace cppgc {
class AllocationHandle;
class HeapHandle;
} // namespace cppgc
namespace v8 {
class Object;
namespace internal {
class CppHeap;
} // namespace internal
class CustomSpaceStatisticsReceiver;
/**
* Describes how V8 wrapper objects maintain references to garbage-collected C++
* objects.
*/
struct WrapperDescriptor final {
/**
* The index used on `v8::Ojbect::SetAlignedPointerFromInternalField()` and
* related APIs to add additional data to an object which is used to identify
* JS->C++ references.
*/
using InternalFieldIndex = int;
/**
* Unknown embedder id. The value is reserved for internal usages and must not
* be used with `CppHeap`.
*/
static constexpr uint16_t kUnknownEmbedderId = UINT16_MAX;
constexpr WrapperDescriptor(InternalFieldIndex wrappable_type_index,
InternalFieldIndex wrappable_instance_index,
uint16_t embedder_id_for_garbage_collected)
: wrappable_type_index(wrappable_type_index),
wrappable_instance_index(wrappable_instance_index),
embedder_id_for_garbage_collected(embedder_id_for_garbage_collected) {}
/**
* Index of the wrappable type.
*/
InternalFieldIndex wrappable_type_index;
/**
* Index of the wrappable instance.
*/
InternalFieldIndex wrappable_instance_index;
/**
* Embedder id identifying instances of garbage-collected objects. It is
* expected that the first field of the wrappable type is a uint16_t holding
* the id. Only references to instances of wrappables types with an id of
* `embedder_id_for_garbage_collected` will be considered by CppHeap.
*/
uint16_t embedder_id_for_garbage_collected;
};
struct V8_EXPORT CppHeapCreateParams {
CppHeapCreateParams(
std::vector<std::unique_ptr<cppgc::CustomSpaceBase>> custom_spaces,
WrapperDescriptor wrapper_descriptor)
: custom_spaces(std::move(custom_spaces)),
wrapper_descriptor(wrapper_descriptor) {}
CppHeapCreateParams(const CppHeapCreateParams&) = delete;
CppHeapCreateParams& operator=(const CppHeapCreateParams&) = delete;
std::vector<std::unique_ptr<cppgc::CustomSpaceBase>> custom_spaces;
WrapperDescriptor wrapper_descriptor;
/**
* Specifies which kind of marking are supported by the heap. The type may be
* further reduced via runtime flags when attaching the heap to an Isolate.
*/
cppgc::Heap::MarkingType marking_support =
cppgc::Heap::MarkingType::kIncrementalAndConcurrent;
/**
* Specifies which kind of sweeping is supported by the heap. The type may be
* further reduced via runtime flags when attaching the heap to an Isolate.
*/
cppgc::Heap::SweepingType sweeping_support =
cppgc::Heap::SweepingType::kIncrementalAndConcurrent;
};
/**
* A heap for allocating managed C++ objects.
*
* Similar to v8::Isolate, the heap may only be accessed from one thread at a
* time. The heap may be used from different threads using the
* v8::Locker/v8::Unlocker APIs which is different from generic Oilpan.
*/
class V8_EXPORT CppHeap {
public:
static std::unique_ptr<CppHeap> Create(v8::Platform* platform,
const CppHeapCreateParams& params);
virtual ~CppHeap() = default;
/**
* \returns the opaque handle for allocating objects using
* `MakeGarbageCollected()`.
*/
cppgc::AllocationHandle& GetAllocationHandle();
/**
* \returns the opaque heap handle which may be used to refer to this heap in
* other APIs. Valid as long as the underlying `CppHeap` is alive.
*/
cppgc::HeapHandle& GetHeapHandle();
/**
* Terminate clears all roots and performs multiple garbage collections to
* reclaim potentially newly created objects in destructors.
*
* After this call, object allocation is prohibited.
*/
void Terminate();
/**
* \param detail_level specifies whether should return detailed
* statistics or only brief summary statistics.
* \returns current CppHeap statistics regarding memory consumption
* and utilization.
*/
cppgc::HeapStatistics CollectStatistics(
cppgc::HeapStatistics::DetailLevel detail_level);
/**
* Collects statistics for the given spaces and reports them to the receiver.
*
* \param custom_spaces a collection of custom space indicies.
* \param receiver an object that gets the results.
*/
void CollectCustomSpaceStatisticsAtLastGC(
std::vector<cppgc::CustomSpaceIndex> custom_spaces,
std::unique_ptr<CustomSpaceStatisticsReceiver> receiver);
/**
* Enables a detached mode that allows testing garbage collection using
* `cppgc::testing` APIs. Once used, the heap cannot be attached to an
* `Isolate` anymore.
*/
void EnableDetachedGarbageCollectionsForTesting();
/**
* Performs a stop-the-world garbage collection for testing purposes.
*
* \param stack_state The stack state to assume for the garbage collection.
*/
void CollectGarbageForTesting(cppgc::EmbedderStackState stack_state);
/**
* Performs a stop-the-world minor garbage collection for testing purposes.
*
* \param stack_state The stack state to assume for the garbage collection.
*/
void CollectGarbageInYoungGenerationForTesting(
cppgc::EmbedderStackState stack_state);
/**
* \returns the wrapper descriptor of this CppHeap.
*/
v8::WrapperDescriptor wrapper_descriptor() const;
private:
CppHeap() = default;
friend class internal::CppHeap;
};
class JSVisitor : public cppgc::Visitor {
public:
explicit JSVisitor(cppgc::Visitor::Key key) : cppgc::Visitor(key) {}
~JSVisitor() override = default;
void Trace(const TracedReferenceBase& ref) {
if (ref.IsEmptyThreadSafe()) return;
Visit(ref);
}
protected:
using cppgc::Visitor::Visit;
virtual void Visit(const TracedReferenceBase& ref) {}
};
/**
* Provided as input to `CppHeap::CollectCustomSpaceStatisticsAtLastGC()`.
*
* Its method is invoked with the results of the statistic collection.
*/
class CustomSpaceStatisticsReceiver {
public:
virtual ~CustomSpaceStatisticsReceiver() = default;
/**
* Reports the size of a space at the last GC. It is called for each space
* that was requested in `CollectCustomSpaceStatisticsAtLastGC()`.
*
* \param space_index The index of the space.
* \param bytes The total size of live objects in the space at the last GC.
* It is zero if there was no GC yet.
*/
virtual void AllocatedBytes(cppgc::CustomSpaceIndex space_index,
size_t bytes) = 0;
};
} // namespace v8
namespace cppgc {
template <typename T>
struct TraceTrait<v8::TracedReference<T>> {
static cppgc::TraceDescriptor GetTraceDescriptor(const void* self) {
return {nullptr, Trace};
}
static void Trace(Visitor* visitor, const void* self) {
static_cast<v8::JSVisitor*>(visitor)->Trace(
*static_cast<const v8::TracedReference<T>*>(self));
}
};
} // namespace cppgc
#endif // INCLUDE_V8_CPPGC_H_