ffae028b37
Bug: v8:12672 Change-Id: Ib4f53086436e028b4ea32fbc960f57e91709d184 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3532256 Reviewed-by: Dominik Inführ <dinfuehr@chromium.org> Commit-Queue: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#79581}
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// Copyright 2021 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 INCLUDE_V8_WEAK_CALLBACK_INFO_H_
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#define INCLUDE_V8_WEAK_CALLBACK_INFO_H_
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace v8 {
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class Isolate;
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namespace api_internal {
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V8_EXPORT void InternalFieldOutOfBounds(int index);
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} // namespace api_internal
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static const int kInternalFieldsInWeakCallback = 2;
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static const int kEmbedderFieldsInWeakCallback = 2;
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template <typename T>
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class WeakCallbackInfo {
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public:
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using Callback = void (*)(const WeakCallbackInfo<T>& data);
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WeakCallbackInfo(Isolate* isolate, T* parameter,
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void* embedder_fields[kEmbedderFieldsInWeakCallback],
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Callback* callback)
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: isolate_(isolate), parameter_(parameter), callback_(callback) {
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for (int i = 0; i < kEmbedderFieldsInWeakCallback; ++i) {
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embedder_fields_[i] = embedder_fields[i];
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}
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}
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V8_INLINE Isolate* GetIsolate() const { return isolate_; }
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V8_INLINE T* GetParameter() const { return parameter_; }
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V8_INLINE void* GetInternalField(int index) const;
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// When first called, the embedder MUST Reset() the Global which triggered the
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// callback. The Global itself is unusable for anything else. No v8 other api
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// calls may be called in the first callback. Should additional work be
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// required, the embedder must set a second pass callback, which will be
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// called after all the initial callbacks are processed.
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// Calling SetSecondPassCallback on the second pass will immediately crash.
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void SetSecondPassCallback(Callback callback) const { *callback_ = callback; }
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private:
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Isolate* isolate_;
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T* parameter_;
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Callback* callback_;
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void* embedder_fields_[kEmbedderFieldsInWeakCallback];
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};
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/**
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* Weakness type for weak handles.
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*/
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enum class WeakCallbackType {
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/**
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* Passes a user-defined void* parameter back to the callback.
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*/
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kParameter,
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/**
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* Passes the first two internal fields of the object back to the callback.
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*/
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kInternalFields,
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/**
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* Passes a user-defined void* parameter back to the callback. Will do so
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* before the object is actually reclaimed, allowing it to be resurrected. In
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* this case it is not possible to set a second-pass callback.
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*/
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kFinalizer V8_ENUM_DEPRECATED("Resurrecting finalizers are deprecated "
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"and will not be supported going forward.")
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};
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template <class T>
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void* WeakCallbackInfo<T>::GetInternalField(int index) const {
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#ifdef V8_ENABLE_CHECKS
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if (index < 0 || index >= kEmbedderFieldsInWeakCallback) {
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api_internal::InternalFieldOutOfBounds(index);
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}
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#endif
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return embedder_fields_[index];
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}
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} // namespace v8
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#endif // INCLUDE_V8_WEAK_CALLBACK_INFO_H_
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