1 /*
2 * Copyright (C) 2007, 2008 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 Computer, 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 #include "config.h"
30 #include "JSCustomSQLTransactionCallback.h"
31
32 #if ENABLE(DATABASE)
33
34 #include "Frame.h"
35 #include "ScriptController.h"
36 #include "JSSQLTransaction.h"
37 #include "Page.h"
38 #include <runtime/JSLock.h>
39 #include <wtf/MainThread.h>
40 #include <wtf/RefCountedLeakCounter.h>
41
42 namespace WebCore {
43
44 using namespace JSC;
45
46 #ifndef NDEBUG
47 static WTF::RefCountedLeakCounter counter("JSCustomSQLTransactionCallback");
48 #endif
49
50 // We have to clean up the data on the main thread for two reasons:
51 //
52 // 1) Can't deref a Frame on a non-main thread.
53 // 2) Unprotecting the JSObject on a non-main thread would register that thread
54 // for JavaScript garbage collection, which could unnecessarily slow things down.
55
56 class JSCustomSQLTransactionCallback::Data {
57 public:
Data(JSObject * callback,Frame * frame)58 Data(JSObject* callback, Frame* frame) : m_callback(callback), m_frame(frame) { }
callback()59 JSObject* callback() { return m_callback; }
frame()60 Frame* frame() { return m_frame.get(); }
61
62 private:
63 ProtectedPtr<JSObject> m_callback;
64 RefPtr<Frame> m_frame;
65 };
66
JSCustomSQLTransactionCallback(JSObject * callback,Frame * frame)67 JSCustomSQLTransactionCallback::JSCustomSQLTransactionCallback(JSObject* callback, Frame* frame)
68 : m_data(new Data(callback, frame))
69 {
70 #ifndef NDEBUG
71 counter.increment();
72 #endif
73 }
74
deleteData(void * context)75 void JSCustomSQLTransactionCallback::deleteData(void* context)
76 {
77 delete static_cast<Data*>(context);
78 }
79
~JSCustomSQLTransactionCallback()80 JSCustomSQLTransactionCallback::~JSCustomSQLTransactionCallback()
81 {
82 callOnMainThread(deleteData, m_data);
83 #ifndef NDEBUG
84 m_data = 0;
85 counter.decrement();
86 #endif
87 }
88
handleEvent(SQLTransaction * transaction,bool & raisedException)89 void JSCustomSQLTransactionCallback::handleEvent(SQLTransaction* transaction, bool& raisedException)
90 {
91 ASSERT(m_data);
92 ASSERT(m_data->callback());
93 ASSERT(m_data->frame());
94
95 if (!m_data->frame()->script()->isEnabled())
96 return;
97
98 // FIXME: This is likely the wrong globalObject (for prototype chains at least)
99 JSGlobalObject* globalObject = m_data->frame()->script()->globalObject();
100 ExecState* exec = globalObject->globalExec();
101
102 JSC::JSLock lock(SilenceAssertionsOnly);
103
104 JSValue handleEventFunction = m_data->callback()->get(exec, Identifier(exec, "handleEvent"));
105 CallData handleEventCallData;
106 CallType handleEventCallType = handleEventFunction.getCallData(handleEventCallData);
107 CallData callbackCallData;
108 CallType callbackCallType = CallTypeNone;
109
110 if (handleEventCallType == CallTypeNone) {
111 callbackCallType = m_data->callback()->getCallData(callbackCallData);
112 if (callbackCallType == CallTypeNone) {
113 // FIXME: Should an exception be thrown here?
114 return;
115 }
116 }
117
118 RefPtr<JSCustomSQLTransactionCallback> protect(this);
119
120 MarkedArgumentBuffer args;
121 args.append(toJS(exec, deprecatedGlobalObjectForPrototype(exec), transaction));
122
123 globalObject->globalData()->timeoutChecker.start();
124 if (handleEventCallType != CallTypeNone)
125 call(exec, handleEventFunction, handleEventCallType, handleEventCallData, m_data->callback(), args);
126 else
127 call(exec, m_data->callback(), callbackCallType, callbackCallData, m_data->callback(), args);
128 globalObject->globalData()->timeoutChecker.stop();
129
130 if (exec->hadException()) {
131 reportCurrentException(exec);
132
133 raisedException = true;
134 }
135
136 Document::updateStyleForAllDocuments();
137 }
138
139 }
140
141 #endif // ENABLE(DATABASE)
142