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
47namespace WebCore {
48
49ScriptState::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
55ScriptState::~ScriptState()
56{
57    m_context.Dispose();
58    m_context.Clear();
59}
60
61ScriptState* 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
80ScriptState* 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
91void ScriptState::weakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
92{
93    ScriptState* scriptState = static_cast<ScriptState*>(parameter);
94    delete scriptState;
95}
96
97ScriptState* mainWorldScriptState(Frame* frame)
98{
99    v8::HandleScope handleScope;
100    V8Proxy* proxy = frame->script()->proxy();
101    return ScriptState::forContext(proxy->mainWorldContext());
102}
103
104ScriptState* 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
112ScriptState* 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)
119ScriptState* 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