FM / cppgc

/snap/node/11691/include/node/cppgc

Name	Size	Mode	Actions
internal/	-	0755	rm
allocation.h	11889	0644	edit dl rm
common.h	643	0644	edit dl rm
cross-thread-persistent.h	15170	0644	edit dl rm
custom-space.h	2454	0644	edit dl rm
default-platform.h	2230	0644	edit dl rm
ephemeron-pair.h	804	0644	edit dl rm
explicit-management.h	3370	0644	edit dl rm
garbage-collected.h	3183	0644	edit dl rm
heap-consistency.h	12021	0644	edit dl rm
heap-handle.h	1289	0644	edit dl rm
heap-state.h	2632	0644	edit dl rm
heap-statistics.h	3982	0644	edit dl rm
heap.h	5834	0644	edit dl rm
liveness-broker.h	2396	0644	edit dl rm
macros.h	1345	0644	edit dl rm
member.h	24114	0644	edit dl rm
name-provider.h	2034	0644	edit dl rm
object-size-trait.h	1643	0644	edit dl rm
persistent.h	13937	0644	edit dl rm
platform.h	6042	0644	edit dl rm
prefinalizer.h	2944	0644	edit dl rm
process-heap-statistics.h	1009	0644	edit dl rm
sentinel-pointer.h	1208	0644	edit dl rm
source-location.h	414	0644	edit dl rm
testing.h	3033	0644	edit dl rm
trace-trait.h	3479	0644	edit dl rm
type-traits.h	8656	0644	edit dl rm
visitor.h	18516	0644	edit dl rm

Edit: /snap/node/11691/include/node/cppgc/trace-trait.h (3479B)

// 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_

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