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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_RENDERER_GC_CALLBACK_H_
#define EXTENSIONS_RENDERER_GC_CALLBACK_H_
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "v8/include/v8-forward.h"
#include "v8/include/v8-persistent-handle.h"
namespace extensions {
class ScriptContext;
// Runs `callback` when v8 garbage collects `object`, or `fallback` if
// `context` is invalidated first. Exactly one of `callback` or `fallback` will
// be called, after which it deletes itself.
// This object manages its own lifetime.
// TODO(devlin): Cleanup. "callback" and "fallback" are odd names here, and
// we should use OnceCallbacks.
class GCCallback {
public:
GCCallback(ScriptContext* context,
const v8::Local<v8::Object>& object,
const v8::Local<v8::Function>& callback,
base::OnceClosure fallback);
GCCallback(ScriptContext* context,
const v8::Local<v8::Object>& object,
base::OnceClosure callback,
base::OnceClosure fallback);
GCCallback(const GCCallback&) = delete;
GCCallback& operator=(const GCCallback&) = delete;
private:
GCCallback(ScriptContext* context,
const v8::Local<v8::Object>& object,
const v8::Local<v8::Function> v8_callback,
base::OnceClosure closure_callback,
base::OnceClosure fallback);
~GCCallback();
static void OnObjectGC(const v8::WeakCallbackInfo<GCCallback>& data);
void RunCallback();
void OnContextInvalidated();
// The context which owns `object_`.
raw_ptr<ScriptContext> context_;
// A task runner associated with the frame for the context.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// The object this GCCallback is bound to.
v8::Global<v8::Object> object_;
// The function to run when `object_` is garbage collected. Can be either a
// JS or native function (only one will be set).
v8::Global<v8::Function> v8_callback_;
base::OnceClosure closure_callback_;
// The function to run if `context_` is invalidated before we have a chance
// to execute `callback_`.
base::OnceClosure fallback_;
base::WeakPtrFactory<GCCallback> weak_ptr_factory_{this};
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_GC_CALLBACK_H_
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