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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCOPED_PERSISTENT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCOPED_PERSISTENT_H_
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "v8/include/v8.h"
namespace blink {
// Holds a persistent handle to a V8 object; use ScopedPersistent instead of
// directly using v8::Persistent. Introducing a (non-weak) ScopedPersistent
// has a risk of producing memory leaks, ask blink-reviews-bindings@ for a
// review.
template <typename T>
class ScopedPersistent {
USING_FAST_MALLOC(ScopedPersistent);
public:
ScopedPersistent() = default;
ScopedPersistent(v8::Isolate* isolate, v8::Local<T> handle)
: handle_(isolate, handle) {}
ScopedPersistent(const ScopedPersistent&) = delete;
ScopedPersistent& operator=(const ScopedPersistent&) = delete;
~ScopedPersistent() { Clear(); }
ALWAYS_INLINE v8::Local<T> NewLocal(v8::Isolate* isolate) const {
return v8::Local<T>::New(isolate, handle_);
}
// If you don't need to get weak callback, use setPhantom instead.
// setPhantom is faster than setWeak.
template <typename P>
void SetWeak(P* parameters,
void (*callback)(const v8::WeakCallbackInfo<P>&),
v8::WeakCallbackType type = v8::WeakCallbackType::kParameter) {
handle_.SetWeak(parameters, callback, type);
}
// Turns this handle into a weak phantom handle without
// finalization callback.
void SetPhantom() { handle_.SetWeak(); }
void ClearWeak() { handle_.template ClearWeak<void>(); }
bool IsEmpty() const { return handle_.IsEmpty(); }
bool IsWeak() const { return handle_.IsWeak(); }
void Set(v8::Isolate* isolate, v8::Local<T> handle) {
handle_.Reset(isolate, handle);
}
// Note: This is clear in the std::unique_ptr sense, not the v8::Local sense.
void Clear() { handle_.Reset(); }
bool operator==(const ScopedPersistent<T>& other) {
return handle_ == other.handle_;
}
template <class S>
bool operator==(const v8::Local<S> other) const {
return handle_ == other;
}
ALWAYS_INLINE v8::Persistent<T>& Get() { return handle_; }
private:
v8::Persistent<T> handle_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_SCOPED_PERSISTENT_H_
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