78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
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// Copyright (c) 2025 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#ifndef ELECTRON_SHELL_COMMON_GIN_HELPER_HANDLE_H_
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#define ELECTRON_SHELL_COMMON_GIN_HELPER_HANDLE_H_
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#include "base/memory/raw_ptr.h"
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#include "gin/converter.h"
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namespace gin_helper {
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// You can use gin_helper::Handle on the stack to retain a gin_helper::Wrappable
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// object. Currently we don't have a mechanism for retaining a
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// gin_helper::Wrappable object in the C++ heap because strong references from
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// C++ to V8 can cause memory leaks. Copied from
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// https://chromium-review.googlesource.com/c/chromium/src/+/6734440 Should be
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// removed once https://github.com/electron/electron/issues/47922 is complete.
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template <typename T>
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class Handle {
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public:
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Handle() : object_(nullptr) {}
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Handle(v8::Local<v8::Value> wrapper, T* object)
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: wrapper_(wrapper), object_(object) {}
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bool IsEmpty() const { return !object_; }
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void Clear() {
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wrapper_.Clear();
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object_ = NULL;
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}
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T* operator->() const { return object_; }
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v8::Local<v8::Value> ToV8() const { return wrapper_; }
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T* get() const { return object_; }
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private:
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v8::Local<v8::Value> wrapper_;
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raw_ptr<T> object_;
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};
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// This function is a convenient way to create a handle from a raw pointer
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// without having to write out the type of the object explicitly.
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template <typename T>
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gin_helper::Handle<T> CreateHandle(v8::Isolate* isolate, T* object) {
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v8::Local<v8::Object> wrapper;
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if (!object->GetWrapper(isolate).ToLocal(&wrapper) || wrapper.IsEmpty())
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return gin_helper::Handle<T>();
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return gin_helper::Handle<T>(wrapper, object);
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}
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} // namespace gin_helper
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namespace gin {
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template <typename T>
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struct Converter<gin_helper::Handle<T>> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const gin_helper::Handle<T>& val) {
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return val.ToV8();
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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gin_helper::Handle<T>* out) {
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T* object = NULL;
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if (!Converter<T*>::FromV8(isolate, val, &object)) {
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return false;
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}
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*out = gin_helper::Handle<T>(val, object);
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return true;
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}
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};
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} // namespace gin
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#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_HANDLE_H_
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