1/*
2 * Copyright (C) 2007-2009, 2015 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#pragma once
30
31#include "JSDOMBinding.h"
32#include "JSDOMGlobalObject.h"
33#include "ScriptExecutionContext.h"
34#include <JavaScriptCore/JSObject.h>
35#include <JavaScriptCore/Strong.h>
36#include <JavaScriptCore/StrongInlines.h>
37#include <wtf/Threading.h>
38
39namespace WebCore {
40
41// We have to clean up this data on the context thread because unprotecting a
42// JSObject on the wrong thread without synchronization would corrupt the heap
43// (and synchronization would be slow).
44
45class JSCallbackData {
46public:
47 enum class CallbackType { Function, Object, FunctionOrObject };
48
49 JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
50
51protected:
52 explicit JSCallbackData(JSDOMGlobalObject* globalObject)
53 : m_globalObject(globalObject)
54 {
55 }
56
57 ~JSCallbackData()
58 {
59#if !PLATFORM(IOS_FAMILY)
60 ASSERT(m_thread.ptr() == &Thread::current());
61#endif
62 }
63
64 static JSC::JSValue invokeCallback(JSDOMGlobalObject&, JSC::JSObject* callback, JSC::JSValue thisValue, JSC::MarkedArgumentBuffer&, CallbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException);
65
66private:
67 JSC::Weak<JSDOMGlobalObject> m_globalObject;
68#ifndef NDEBUG
69 Ref<Thread> m_thread { Thread::current() };
70#endif
71};
72
73class JSCallbackDataStrong : public JSCallbackData {
74public:
75 JSCallbackDataStrong(JSC::JSObject* callback, JSDOMGlobalObject* globalObject, void*)
76 : JSCallbackData(globalObject)
77 , m_callback(globalObject->vm(), callback)
78 {
79 }
80
81 JSC::JSObject* callback() { return m_callback.get(); }
82
83 JSC::JSValue invokeCallback(JSC::JSValue thisValue, JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
84 {
85 auto* globalObject = this->globalObject();
86 if (!globalObject)
87 return { };
88
89 return JSCallbackData::invokeCallback(*globalObject, callback(), thisValue, args, callbackType, functionName, returnedException);
90 }
91
92private:
93 JSC::Strong<JSC::JSObject> m_callback;
94};
95
96class JSCallbackDataWeak : public JSCallbackData {
97public:
98 JSCallbackDataWeak(JSC::JSObject* callback, JSDOMGlobalObject* globalObject, void* owner)
99 : JSCallbackData(globalObject)
100 , m_callback(callback, &m_weakOwner, owner)
101 {
102 }
103
104 JSC::JSObject* callback() { return m_callback.get(); }
105
106 JSC::JSValue invokeCallback(JSC::JSValue thisValue, JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
107 {
108 auto* globalObject = this->globalObject();
109 if (!globalObject)
110 return { };
111
112 return JSCallbackData::invokeCallback(*globalObject, callback(), thisValue, args, callbackType, functionName, returnedException);
113 }
114
115 void visitJSFunction(JSC::SlotVisitor&);
116
117private:
118 class WeakOwner : public JSC::WeakHandleOwner {
119 bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor&, const char**) override;
120 };
121 WeakOwner m_weakOwner;
122 JSC::Weak<JSC::JSObject> m_callback;
123};
124
125class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
126public:
127 template <typename CallbackDataType>
128 explicit DeleteCallbackDataTask(CallbackDataType* data)
129 : ScriptExecutionContext::Task(ScriptExecutionContext::Task::CleanupTask, [data = std::unique_ptr<CallbackDataType>(data)] (ScriptExecutionContext&) {
130 })
131 {
132 }
133};
134
135} // namespace WebCore
136