1 /*
2 * Copyright (C) 2009 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 <v8.h>
41 #include <wtf/Assertions.h>
42
43 namespace WebCore {
44
ScriptState(v8::Handle<v8::Context> context)45 ScriptState::ScriptState(v8::Handle<v8::Context> context)
46 : m_context(v8::Persistent<v8::Context>::New(context))
47 {
48 m_context.MakeWeak(this, &ScriptState::weakReferenceCallback);
49 }
50
~ScriptState()51 ScriptState::~ScriptState()
52 {
53 m_context.Dispose();
54 m_context.Clear();
55 }
56
forContext(v8::Local<v8::Context> context)57 ScriptState* ScriptState::forContext(v8::Local<v8::Context> context)
58 {
59 v8::Context::Scope contextScope(context);
60
61 v8::Local<v8::Object> global = context->Global();
62 // Skip proxy object. The proxy object will survive page navigation while we need
63 // an object whose lifetime consides with that of the inspected context.
64 global = v8::Local<v8::Object>::Cast(global->GetPrototype());
65
66 v8::Handle<v8::String> key = V8HiddenPropertyName::scriptState();
67 v8::Local<v8::Value> val = global->GetHiddenValue(key);
68 if (!val.IsEmpty() && val->IsExternal())
69 return static_cast<ScriptState*>(v8::External::Cast(*val)->Value());
70
71 ScriptState* state = new ScriptState(context);
72 global->SetHiddenValue(key, v8::External::New(state));
73 return state;
74 }
75
current()76 ScriptState* ScriptState::current()
77 {
78 v8::HandleScope handleScope;
79 v8::Local<v8::Context> context = v8::Context::GetCurrent();
80 if (context.IsEmpty()) {
81 ASSERT_NOT_REACHED();
82 return 0;
83 }
84 return ScriptState::forContext(context);
85 }
86
weakReferenceCallback(v8::Persistent<v8::Value> object,void * parameter)87 void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
88 {
89 ScriptState* scriptState = static_cast<ScriptState*>(parameter);
90 delete scriptState;
91 }
92
mainWorldScriptState(Frame * frame)93 ScriptState* mainWorldScriptState(Frame* frame)
94 {
95 v8::HandleScope handleScope;
96 V8Proxy* proxy = frame->script()->proxy();
97 return ScriptState::forContext(proxy->mainWorldContext());
98 }
99
scriptStateFromNode(DOMWrapperWorld *,Node * node)100 ScriptState* scriptStateFromNode(DOMWrapperWorld*, Node* node)
101 {
102 // This should be never reached with V8 bindings (WebKit only uses it
103 // for non-JS bindings)
104 ASSERT_NOT_REACHED();
105 return 0;
106 }
107
scriptStateFromPage(DOMWrapperWorld *,Page * page)108 ScriptState* scriptStateFromPage(DOMWrapperWorld*, Page* page)
109 {
110 // This should be only reached with V8 bindings from single process layout tests.
111 return mainWorldScriptState(page->mainFrame());
112 }
113
114 }
115