1 /*
2 * Copyright (C) 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 #include "config.h"
32 #include "ScriptState.h"
33
34 #include "Frame.h"
35 #include "Node.h"
36 #include "Page.h"
37 #include "ScriptController.h"
38 #include "V8HiddenPropertyName.h"
39
40 #include "WorkerContext.h"
41 #include "WorkerContextExecutionProxy.h"
42 #include "WorkerScriptController.h"
43
44 #include <v8.h>
45 #include <wtf/Assertions.h>
46
47 namespace WebCore {
48
ScriptState(v8::Handle<v8::Context> context)49 ScriptState::ScriptState(v8::Handle<v8::Context> context)
50 : m_context(v8::Persistent<v8::Context>::New(context))
51 {
52 m_context.MakeWeak(this, &ScriptState::weakReferenceCallback);
53 }
54
~ScriptState()55 ScriptState::~ScriptState()
56 {
57 m_context.Dispose();
58 m_context.Clear();
59 }
60
forContext(v8::Local<v8::Context> context)61 ScriptState* ScriptState::forContext(v8::Local<v8::Context> context)
62 {
63 v8::Context::Scope contextScope(context);
64
65 v8::Local<v8::Object> global = context->Global();
66 // Skip proxy object. The proxy object will survive page navigation while we need
67 // an object whose lifetime consides with that of the inspected context.
68 global = v8::Local<v8::Object>::Cast(global->GetPrototype());
69
70 v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState();
71 v8::Local<v8::Value> val = global->GetHiddenValue(key);
72 if (!val.IsEmpty() && val->IsExternal())
73 return static_cast<ScriptState*>(v8::External::Cast(*val)->Value());
74
75 ScriptState* state = new ScriptState(context);
76 global->SetHiddenValue(key, v8::External::New(state));
77 return state;
78 }
79
current()80 ScriptState* ScriptState::current()
81 {
82 v8::HandleScope handleScope;
83 v8::Local<v8::Context> context = v8::Context::GetCurrent();
84 if (context.IsEmpty()) {
85 ASSERT_NOT_REACHED();
86 return 0;
87 }
88 return ScriptState::forContext(context);
89 }
90
weakReferenceCallback(v8::Persistent<v8::Value> object,void * parameter)91 void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
92 {
93 ScriptState* scriptState = static_cast<ScriptState*>(parameter);
94 delete scriptState;
95 }
96
mainWorldScriptState(Frame * frame)97 ScriptState* mainWorldScriptState(Frame* frame)
98 {
99 v8::HandleScope handleScope;
100 V8Proxy* proxy = frame->script()->proxy();
101 return ScriptState::forContext(proxy->mainWorldContext());
102 }
103
scriptStateFromNode(DOMWrapperWorld *,Node * node)104 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node)
105 {
106 // This should be never reached with V8 bindings (WebKit only uses it
107 // for non-JS bindings)
108 ASSERT_NOT_REACHED();
109 return 0;
110 }
111
scriptStateFromPage(DOMWrapperWorld *,Page * page)112 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page)
113 {
114 // This should be only reached with V8 bindings from single process layout tests.
115 return mainWorldScriptState(page->mainFrame());
116 }
117
118 #if ENABLE(WORKERS)
scriptStateFromWorkerContext(WorkerContext * workerContext)119 ScriptState* scriptStateFromWorkerContext(WorkerContext* workerContext)
120 {
121 WorkerContextExecutionProxy* proxy = workerContext->script()->proxy();
122 if (!proxy)
123 return 0;
124
125 v8::HandleScope handleScope;
126 v8::Local<v8::Context> context = proxy->context();
127 return ScriptState::forContext(context);
128 }
129 #endif
130
131 }
132