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
33#if ENABLE(WORKERS)
34
35#include "WorkerScriptController.h"
36
37#include "DOMTimer.h"
38#include "ScriptCallStack.h"
39#include "ScriptSourceCode.h"
40#include "ScriptValue.h"
41#include "V8DOMMap.h"
42#include "V8Proxy.h"
43#include "V8WorkerContext.h"
44#include "WorkerContext.h"
45#include "WorkerContextExecutionProxy.h"
46#include "WorkerObjectProxy.h"
47#include "WorkerThread.h"
48#include <v8.h>
49
50namespace WebCore {
51
52WorkerScriptController::WorkerScriptController(WorkerContext* workerContext)
53    : m_workerContext(workerContext)
54    , m_proxy(new WorkerContextExecutionProxy(workerContext))
55    , m_executionForbidden(false)
56{
57}
58
59WorkerScriptController::~WorkerScriptController()
60{
61    removeAllDOMObjectsInCurrentThread();
62}
63
64ScriptValue WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode)
65{
66    return evaluate(sourceCode, 0);
67}
68
69ScriptValue WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, ScriptValue* exception)
70{
71    if (isExecutionForbidden())
72        return ScriptValue();
73
74    WorkerContextExecutionState state;
75    ScriptValue result = m_proxy->evaluate(sourceCode.source(), sourceCode.url().string(), WTF::toZeroBasedTextPosition(sourceCode.startPosition()), &state);
76    if (state.hadException) {
77        if (exception)
78            *exception = state.exception;
79        else
80            m_workerContext->reportException(state.errorMessage, state.lineNumber, state.sourceURL, 0);
81    }
82
83    return result;
84}
85
86void WorkerScriptController::scheduleExecutionTermination()
87{
88    v8::V8::TerminateExecution();
89}
90
91void WorkerScriptController::forbidExecution()
92{
93    ASSERT(m_workerContext->isContextThread());
94    m_executionForbidden = true;
95}
96
97bool WorkerScriptController::isExecutionForbidden() const
98{
99    ASSERT(m_workerContext->isContextThread());
100    return m_executionForbidden;
101}
102
103void WorkerScriptController::setException(ScriptValue exception)
104{
105    throwError(*exception.v8Value());
106}
107
108WorkerScriptController* WorkerScriptController::controllerForContext()
109{
110    // Happens on frame destruction, check otherwise GetCurrent() will crash.
111    if (!v8::Context::InContext())
112        return 0;
113    v8::Handle<v8::Context> context = v8::Context::GetCurrent();
114    v8::Handle<v8::Object> global = context->Global();
115    global = V8DOMWrapper::lookupDOMWrapper(V8WorkerContext::GetTemplate(), global);
116    // Return 0 if the current executing context is not the worker context.
117    if (global.IsEmpty())
118        return 0;
119    WorkerContext* workerContext = V8WorkerContext::toNative(global);
120    return workerContext->script();
121}
122
123} // namespace WebCore
124
125#endif // ENABLE(WORKERS)
126