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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_CPPGC_TRACE_TRAIT_H_
#define INCLUDE_CPPGC_TRACE_TRAIT_H_
#include <type_traits>
#include "cppgc/type-traits.h"
#include "v8config.h" // NOLINT(build/include_directory)
namespace cppgc {
class Visitor;
namespace internal {
class RootVisitor;
using TraceRootCallback = void (*)(RootVisitor&, const void* object);
// Implementation of the default TraceTrait handling GarbageCollected and
// GarbageCollectedMixin.
template <typename T,
bool =
IsGarbageCollectedMixinTypeV<typename std::remove_const<T>::type>>
struct TraceTraitImpl;
} // namespace internal
/**
* Callback for invoking tracing on a given object.
*
* \param visitor The visitor to dispatch to.
* \param object The object to invoke tracing on.
*/
using TraceCallback = void (*)(Visitor* visitor, const void* object);
/**
* Describes how to trace an object, i.e., how to visit all Oilpan-relevant
* fields of an object.
*/
struct TraceDescriptor {
/**
* Adjusted base pointer, i.e., the pointer to the class inheriting directly
* from GarbageCollected, of the object that is being traced.
*/
const void* base_object_payload;
/**
* Callback for tracing the object.
*/
TraceCallback callback;
};
/**
* Callback for getting a TraceDescriptor for a given address.
*
* \param address Possibly inner address of an object.
* \returns a TraceDescriptor for the provided address.
*/
using TraceDescriptorCallback = TraceDescriptor (*)(const void* address);
namespace internal {
struct V8_EXPORT TraceTraitFromInnerAddressImpl {
static TraceDescriptor GetTraceDescriptor(const void* address);
};
/**
* Trait specifying how the garbage collector processes an object of type T.
*
* Advanced users may override handling by creating a specialization for their
* type.
*/
template <typename T>
struct TraceTraitBase {
static_assert(internal::IsTraceableV<T>, "T must have a Trace() method");
/**
* Accessor for retrieving a TraceDescriptor to process an object of type T.
*
* \param self The object to be processed.
* \returns a TraceDescriptor to process the object.
*/
static TraceDescriptor GetTraceDescriptor(const void* self) {
return internal::TraceTraitImpl<T>::GetTraceDescriptor(
static_cast<const T*>(self));
}
/**
* Function invoking the tracing for an object of type T.
*
* \param visitor The visitor to dispatch to.
* \param self The object to invoke tracing on.
*/
static void Trace(Visitor* visitor, const void* self) {
static_cast<const T*>(self)->Trace(visitor);
}
};
} // namespace internal
template <typename T>
struct TraceTrait : public internal::TraceTraitBase<T> {};
namespace internal {
template <typename T>
struct TraceTraitImpl<T, false> {
static_assert(IsGarbageCollectedTypeV<T>,
"T must be of type GarbageCollected or GarbageCollectedMixin");
static TraceDescriptor GetTraceDescriptor(const void* self) {
return {self, TraceTrait<T>::Trace};
}
};
template <typename T>
struct TraceTraitImpl<T, true> {
static TraceDescriptor GetTraceDescriptor(const void* self) {
return internal::TraceTraitFromInnerAddressImpl::GetTraceDescriptor(self);
}
};
} // namespace internal
} // namespace cppgc
#endif // INCLUDE_CPPGC_TRACE_TRAIT_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| internal | Folder | 0755 |
|
|
| allocation.h | File | 11.61 KB | 0644 |
|
| common.h | File | 643 B | 0644 |
|
| cross-thread-persistent.h | File | 14.81 KB | 0644 |
|
| custom-space.h | File | 2.4 KB | 0644 |
|
| default-platform.h | File | 2.18 KB | 0644 |
|
| ephemeron-pair.h | File | 804 B | 0644 |
|
| explicit-management.h | File | 3.29 KB | 0644 |
|
| garbage-collected.h | File | 3.11 KB | 0644 |
|
| heap-consistency.h | File | 11.74 KB | 0644 |
|
| heap-handle.h | File | 1.26 KB | 0644 |
|
| heap-state.h | File | 2.57 KB | 0644 |
|
| heap-statistics.h | File | 3.89 KB | 0644 |
|
| heap.h | File | 5.7 KB | 0644 |
|
| liveness-broker.h | File | 2.34 KB | 0644 |
|
| macros.h | File | 1.31 KB | 0644 |
|
| member.h | File | 23.55 KB | 0644 |
|
| name-provider.h | File | 1.99 KB | 0644 |
|
| object-size-trait.h | File | 1.6 KB | 0644 |
|
| persistent.h | File | 13.61 KB | 0644 |
|
| platform.h | File | 5.9 KB | 0644 |
|
| prefinalizer.h | File | 2.88 KB | 0644 |
|
| process-heap-statistics.h | File | 1009 B | 0644 |
|
| sentinel-pointer.h | File | 1.18 KB | 0644 |
|
| source-location.h | File | 414 B | 0644 |
|
| testing.h | File | 2.96 KB | 0644 |
|
| trace-trait.h | File | 3.4 KB | 0644 |
|
| type-traits.h | File | 8.45 KB | 0644 |
|
| visitor.h | File | 18.08 KB | 0644 |
|