c4e7f6b697
This CL adds the necessary traits to dispatch from Member through a visitor implementation for GarabgeCollected and GarbageCollectedMixin. Bug: chromium:1056170 Change-Id: I12680335044aaa842639fb5e8f9a3ac61587f51a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2138431 Reviewed-by: Hannes Payer <hpayer@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Omer Katz <omerkatz@chromium.org> Reviewed-by: Anton Bikineev <bikineev@chromium.org> Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#67041}
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_HEAP_CPPGC_TRACE_TRAIT_H_
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#define V8_HEAP_CPPGC_TRACE_TRAIT_H_
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#include <type_traits>
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#include "include/cppgc/type-traits.h"
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namespace cppgc {
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class Visitor;
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namespace internal {
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template <typename T,
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bool =
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IsGarbageCollectedMixinTypeV<typename std::remove_const<T>::type>>
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struct TraceTraitImpl;
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} // namespace internal
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using TraceCallback = void (*)(Visitor*, const void*);
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// TraceDescriptor is used to describe how to trace an object.
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struct TraceDescriptor {
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// The adjusted base pointer of the object that should be traced.
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const void* base_object_payload;
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// A callback for tracing the object.
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TraceCallback callback;
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};
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template <typename T>
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struct TraceTrait {
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static_assert(internal::IsTraceableV<T>, "T must have a Trace() method");
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static TraceDescriptor GetTraceDescriptor(const void* self) {
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return internal::TraceTraitImpl<T>::GetTraceDescriptor(
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static_cast<const T*>(self));
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}
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static void Trace(Visitor* visitor, const void* self) {
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// TODO(chromium:1056170): Remove const_cast when Trace() methods are const.
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static_cast<T*>(const_cast<void*>(self))->Trace(visitor);
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}
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};
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namespace internal {
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template <typename T>
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struct TraceTraitImpl<T, false> {
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static TraceDescriptor GetTraceDescriptor(const void* self) {
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return {self, TraceTrait<T>::Trace};
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}
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};
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template <typename T>
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struct TraceTraitImpl<T, true> {
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static TraceDescriptor GetTraceDescriptor(const void* self) {
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return static_cast<const T*>(self)->GetTraceDescriptor();
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}
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};
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} // namespace internal
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} // namespace cppgc
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#endif // V8_HEAP_CPPGC_TRACE_TRAIT_H_
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