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 | |
39 | namespace 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 | |
45 | class JSCallbackData { |
46 | public: |
47 | enum class CallbackType { Function, Object, FunctionOrObject }; |
48 | |
49 | JSDOMGlobalObject* globalObject() { return m_globalObject.get(); } |
50 | |
51 | protected: |
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 | |
66 | private: |
67 | JSC::Weak<JSDOMGlobalObject> m_globalObject; |
68 | #ifndef NDEBUG |
69 | Ref<Thread> m_thread { Thread::current() }; |
70 | #endif |
71 | }; |
72 | |
73 | class JSCallbackDataStrong : public JSCallbackData { |
74 | public: |
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 | |
92 | private: |
93 | JSC::Strong<JSC::JSObject> m_callback; |
94 | }; |
95 | |
96 | class JSCallbackDataWeak : public JSCallbackData { |
97 | public: |
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 | |
117 | private: |
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 | |
125 | class DeleteCallbackDataTask : public ScriptExecutionContext::Task { |
126 | public: |
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 | |