1 /*
2 * Copyright (C) 2008, 2009, 2011 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #ifndef ScriptState_h
32 #define ScriptState_h
33
34 #include "DOMWrapperWorld.h"
35 #include <v8.h>
36 #include <wtf/Noncopyable.h>
37 #include <wtf/RefCounted.h>
38
39 namespace WebCore {
40 class DOMWrapperWorld;
41 class Frame;
42 class Node;
43 class Page;
44 class WorkerContext;
45
46 class ScriptState {
47 WTF_MAKE_NONCOPYABLE(ScriptState);
48 public:
hadException()49 bool hadException() { return !m_exception.IsEmpty(); }
setException(v8::Local<v8::Value> exception)50 void setException(v8::Local<v8::Value> exception)
51 {
52 m_exception = exception;
53 }
exception()54 v8::Local<v8::Value> exception() { return m_exception; }
55
context()56 v8::Local<v8::Context> context() const
57 {
58 return v8::Local<v8::Context>::New(m_context);
59 }
60
61 static ScriptState* forContext(v8::Local<v8::Context>);
62 static ScriptState* current();
63
64 protected:
ScriptState()65 ScriptState() { }
66 ~ScriptState();
67
68 private:
69 friend ScriptState* mainWorldScriptState(Frame*);
70 explicit ScriptState(v8::Handle<v8::Context>);
71
72 static void weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter);
73
74 v8::Local<v8::Value> m_exception;
75 v8::Persistent<v8::Context> m_context;
76 };
77
78 class EmptyScriptState : public ScriptState {
79 public:
EmptyScriptState()80 EmptyScriptState() : ScriptState() { }
~EmptyScriptState()81 ~EmptyScriptState() { }
82 };
83
84 class ScriptStateProtectedPtr {
85 WTF_MAKE_NONCOPYABLE(ScriptStateProtectedPtr);
86 public:
ScriptStateProtectedPtr()87 ScriptStateProtectedPtr() : m_scriptState(0) { }
ScriptStateProtectedPtr(ScriptState * scriptState)88 ScriptStateProtectedPtr(ScriptState* scriptState) : m_scriptState(scriptState)
89 {
90 v8::HandleScope handleScope;
91 // Keep the context from being GC'ed. ScriptState is guaranteed to be live while the context is live.
92 m_context = v8::Persistent<v8::Context>::New(scriptState->context());
93 }
~ScriptStateProtectedPtr()94 ~ScriptStateProtectedPtr()
95 {
96 if (!m_context.IsEmpty()) {
97 m_context.Dispose();
98 m_context.Clear();
99 }
100 }
get()101 ScriptState* get() const { return m_scriptState; }
102 private:
103 ScriptState* m_scriptState;
104 v8::Persistent<v8::Context> m_context;
105 };
106
107 ScriptState* mainWorldScriptState(Frame*);
108
109 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node*);
110 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page*);
111
112 #if ENABLE(WORKERS)
113 ScriptState* scriptStateFromWorkerContext(WorkerContext*);
114 #endif
115
debuggerWorld()116 inline DOMWrapperWorld* debuggerWorld() { return mainThreadNormalWorld(); }
pluginWorld()117 inline DOMWrapperWorld* pluginWorld() { return mainThreadNormalWorld(); }
118
119 }
120
121 #endif // ScriptState_h
122