1 /*
2 * Copyright (C) 2009, 2012 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 #include "bindings/core/v8/WorkerScriptController.h"
34
35 #include "bindings/core/v8/ScriptSourceCode.h"
36 #include "bindings/core/v8/ScriptValue.h"
37 #include "bindings/core/v8/V8DedicatedWorkerGlobalScope.h"
38 #include "bindings/core/v8/V8ErrorHandler.h"
39 #include "bindings/core/v8/V8GCController.h"
40 #include "bindings/core/v8/V8Initializer.h"
41 #include "bindings/core/v8/V8ObjectConstructor.h"
42 #include "bindings/core/v8/V8ScriptRunner.h"
43 #include "bindings/core/v8/V8SharedWorkerGlobalScope.h"
44 #include "bindings/core/v8/V8WorkerGlobalScope.h"
45 #include "bindings/core/v8/WrapperTypeInfo.h"
46 #include "bindings/modules/v8/V8ServiceWorkerGlobalScope.h"
47 #include "core/events/ErrorEvent.h"
48 #include "core/frame/DOMTimer.h"
49 #include "core/inspector/ScriptCallStack.h"
50 #include "core/workers/SharedWorkerGlobalScope.h"
51 #include "core/workers/WorkerGlobalScope.h"
52 #include "core/workers/WorkerObjectProxy.h"
53 #include "core/workers/WorkerThread.h"
54 #include "platform/heap/ThreadState.h"
55 #include "public/platform/Platform.h"
56 #include "public/platform/WebWorkerRunLoop.h"
57 #include <v8.h>
58
59 namespace blink {
60
61 class WorkerScriptController::WorkerGlobalScopeExecutionState FINAL {
62 STACK_ALLOCATED();
63 public:
WorkerGlobalScopeExecutionState(WorkerScriptController * controller)64 explicit WorkerGlobalScopeExecutionState(WorkerScriptController* controller)
65 : hadException(false)
66 , lineNumber(0)
67 , columnNumber(0)
68 , m_controller(controller)
69 , m_outerState(controller->m_globalScopeExecutionState)
70 {
71 m_controller->m_globalScopeExecutionState = this;
72 }
73
~WorkerGlobalScopeExecutionState()74 ~WorkerGlobalScopeExecutionState()
75 {
76 m_controller->m_globalScopeExecutionState = m_outerState;
77 }
78
trace(Visitor * visitor)79 void trace(Visitor* visitor)
80 {
81 visitor->trace(m_errorEventFromImportedScript);
82 }
83
84 bool hadException;
85 String errorMessage;
86 int lineNumber;
87 int columnNumber;
88 String sourceURL;
89 ScriptValue exception;
90 RefPtrWillBeMember<ErrorEvent> m_errorEventFromImportedScript;
91
92 // A WorkerGlobalScopeExecutionState context is stack allocated by
93 // WorkerScriptController::evaluate(), with the contoller using it
94 // during script evaluation. To handle nested evaluate() uses,
95 // WorkerGlobalScopeExecutionStates are chained together;
96 // |m_outerState| keeps a pointer to the context object one level out
97 // (or 0, if outermost.) Upon return from evaluate(), the
98 // WorkerScriptController's WorkerGlobalScopeExecutionState is popped
99 // and the previous one restored (see above dtor.)
100 //
101 // With Oilpan, |m_outerState| isn't traced. It'll be "up the stack"
102 // and its fields will be traced when scanning the stack.
103 WorkerScriptController* m_controller;
104 WorkerGlobalScopeExecutionState* m_outerState;
105 };
106
WorkerScriptController(WorkerGlobalScope & workerGlobalScope)107 WorkerScriptController::WorkerScriptController(WorkerGlobalScope& workerGlobalScope)
108 : m_isolate(0)
109 , m_workerGlobalScope(workerGlobalScope)
110 , m_executionForbidden(false)
111 , m_executionScheduledToTerminate(false)
112 , m_globalScopeExecutionState(0)
113 {
114 m_isolate = V8PerIsolateData::initialize();
115 V8Initializer::initializeWorker(m_isolate);
116 m_world = DOMWrapperWorld::create(WorkerWorldId);
117 m_interruptor = adoptPtr(new V8IsolateInterruptor(m_isolate));
118 ThreadState::current()->addInterruptor(m_interruptor.get());
119 }
120
121 // We need to postpone V8 Isolate destruction until the very end of
122 // worker thread finalization when all objects on the worker heap
123 // are destroyed.
124 class IsolateCleanupTask : public ThreadState::CleanupTask {
125 public:
create(v8::Isolate * isolate)126 static PassOwnPtr<IsolateCleanupTask> create(v8::Isolate* isolate)
127 {
128 return adoptPtr(new IsolateCleanupTask(isolate));
129 }
130
postCleanup()131 virtual void postCleanup()
132 {
133 V8PerIsolateData::destroy(m_isolate);
134 }
135
136 private:
IsolateCleanupTask(v8::Isolate * isolate)137 explicit IsolateCleanupTask(v8::Isolate* isolate) : m_isolate(isolate) { }
138
139 v8::Isolate* m_isolate;
140 };
141
~WorkerScriptController()142 WorkerScriptController::~WorkerScriptController()
143 {
144 ThreadState::current()->removeInterruptor(m_interruptor.get());
145
146 m_world->dispose();
147
148 // The corresponding call to didStartWorkerRunLoop is in
149 // WorkerThread::initialize().
150 // See http://webkit.org/b/83104#c14 for why this is here.
151 blink::Platform::current()->didStopWorkerRunLoop(blink::WebWorkerRunLoop(m_workerGlobalScope.thread()));
152
153 if (isContextInitialized())
154 m_scriptState->disposePerContextData();
155
156 V8PerIsolateData::willBeDestroyed(m_isolate);
157
158 ThreadState::current()->addCleanupTask(IsolateCleanupTask::create(m_isolate));
159 }
160
initializeContextIfNeeded()161 bool WorkerScriptController::initializeContextIfNeeded()
162 {
163 v8::HandleScope handleScope(m_isolate);
164
165 if (isContextInitialized())
166 return true;
167
168 v8::Handle<v8::Context> context = v8::Context::New(m_isolate);
169 if (context.IsEmpty())
170 return false;
171
172 m_scriptState = ScriptState::create(context, m_world);
173
174 ScriptState::Scope scope(m_scriptState.get());
175
176 // Set DebugId for the new context.
177 context->SetEmbedderData(0, v8AtomicString(m_isolate, "worker"));
178
179 // Create a new JS object and use it as the prototype for the shadow global object.
180 const WrapperTypeInfo* wrapperTypeInfo = m_workerGlobalScope.wrapperTypeInfo();
181 v8::Handle<v8::Function> workerGlobalScopeConstructor = m_scriptState->perContextData()->constructorForType(wrapperTypeInfo);
182 v8::Local<v8::Object> jsWorkerGlobalScope = V8ObjectConstructor::newInstance(m_isolate, workerGlobalScopeConstructor);
183 if (jsWorkerGlobalScope.IsEmpty()) {
184 m_scriptState->disposePerContextData();
185 return false;
186 }
187
188 V8DOMWrapper::associateObjectWithWrapperNonTemplate(&m_workerGlobalScope, wrapperTypeInfo, jsWorkerGlobalScope, m_isolate);
189
190 // Insert the object instance as the prototype of the shadow object.
191 v8::Handle<v8::Object> globalObject = v8::Handle<v8::Object>::Cast(m_scriptState->context()->Global()->GetPrototype());
192 globalObject->SetPrototype(jsWorkerGlobalScope);
193
194 return true;
195 }
196
evaluate(const String & script,const String & fileName,const TextPosition & scriptStartPosition)197 ScriptValue WorkerScriptController::evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition)
198 {
199 if (!initializeContextIfNeeded())
200 return ScriptValue();
201
202 ScriptState::Scope scope(m_scriptState.get());
203
204 if (!m_disableEvalPending.isEmpty()) {
205 m_scriptState->context()->AllowCodeGenerationFromStrings(false);
206 m_scriptState->context()->SetErrorMessageForCodeGenerationFromStrings(v8String(m_isolate, m_disableEvalPending));
207 m_disableEvalPending = String();
208 }
209
210 v8::TryCatch block;
211
212 v8::Handle<v8::String> scriptString = v8String(m_isolate, script);
213 v8::Handle<v8::Script> compiledScript = V8ScriptRunner::compileScript(scriptString, fileName, scriptStartPosition, 0, 0, m_isolate);
214 v8::Local<v8::Value> result = V8ScriptRunner::runCompiledScript(compiledScript, &m_workerGlobalScope, m_isolate);
215
216 if (!block.CanContinue()) {
217 m_workerGlobalScope.script()->forbidExecution();
218 return ScriptValue();
219 }
220
221 if (block.HasCaught()) {
222 v8::Local<v8::Message> message = block.Message();
223 m_globalScopeExecutionState->hadException = true;
224 m_globalScopeExecutionState->errorMessage = toCoreString(message->Get());
225 m_globalScopeExecutionState->lineNumber = message->GetLineNumber();
226 m_globalScopeExecutionState->columnNumber = message->GetStartColumn() + 1;
227 TOSTRING_DEFAULT(V8StringResource<>, sourceURL, message->GetScriptOrigin().ResourceName(), ScriptValue());
228 m_globalScopeExecutionState->sourceURL = sourceURL;
229 m_globalScopeExecutionState->exception = ScriptValue(m_scriptState.get(), block.Exception());
230 block.Reset();
231 } else {
232 m_globalScopeExecutionState->hadException = false;
233 }
234
235 if (result.IsEmpty() || result->IsUndefined())
236 return ScriptValue();
237
238 return ScriptValue(m_scriptState.get(), result);
239 }
240
evaluate(const ScriptSourceCode & sourceCode,RefPtrWillBeRawPtr<ErrorEvent> * errorEvent)241 void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, RefPtrWillBeRawPtr<ErrorEvent>* errorEvent)
242 {
243 if (isExecutionForbidden())
244 return;
245
246 WorkerGlobalScopeExecutionState state(this);
247 evaluate(sourceCode.source(), sourceCode.url().string(), sourceCode.startPosition());
248 if (state.hadException) {
249 if (errorEvent) {
250 if (state.m_errorEventFromImportedScript) {
251 // Propagate inner error event outwards.
252 *errorEvent = state.m_errorEventFromImportedScript.release();
253 return;
254 }
255 if (m_workerGlobalScope.shouldSanitizeScriptError(state.sourceURL, NotSharableCrossOrigin))
256 *errorEvent = ErrorEvent::createSanitizedError(m_world.get());
257 else
258 *errorEvent = ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, m_world.get());
259 V8ErrorHandler::storeExceptionOnErrorEventWrapper(errorEvent->get(), state.exception.v8Value(), m_scriptState->context()->Global(), m_isolate);
260 } else {
261 ASSERT(!m_workerGlobalScope.shouldSanitizeScriptError(state.sourceURL, NotSharableCrossOrigin));
262 RefPtrWillBeRawPtr<ErrorEvent> event = nullptr;
263 if (state.m_errorEventFromImportedScript)
264 event = state.m_errorEventFromImportedScript.release();
265 else
266 event = ErrorEvent::create(state.errorMessage, state.sourceURL, state.lineNumber, state.columnNumber, m_world.get());
267 m_workerGlobalScope.reportException(event, 0, nullptr, NotSharableCrossOrigin);
268 }
269 }
270 }
271
scheduleExecutionTermination()272 void WorkerScriptController::scheduleExecutionTermination()
273 {
274 // The mutex provides a memory barrier to ensure that once
275 // termination is scheduled, isExecutionTerminating will
276 // accurately reflect that state when called from another thread.
277 {
278 MutexLocker locker(m_scheduledTerminationMutex);
279 m_executionScheduledToTerminate = true;
280 }
281 v8::V8::TerminateExecution(m_isolate);
282 }
283
isExecutionTerminating() const284 bool WorkerScriptController::isExecutionTerminating() const
285 {
286 // See comments in scheduleExecutionTermination regarding mutex usage.
287 MutexLocker locker(m_scheduledTerminationMutex);
288 return m_executionScheduledToTerminate;
289 }
290
forbidExecution()291 void WorkerScriptController::forbidExecution()
292 {
293 ASSERT(m_workerGlobalScope.isContextThread());
294 m_executionForbidden = true;
295 }
296
isExecutionForbidden() const297 bool WorkerScriptController::isExecutionForbidden() const
298 {
299 ASSERT(m_workerGlobalScope.isContextThread());
300 return m_executionForbidden;
301 }
302
disableEval(const String & errorMessage)303 void WorkerScriptController::disableEval(const String& errorMessage)
304 {
305 m_disableEvalPending = errorMessage;
306 }
307
rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent> errorEvent,ExceptionState & exceptionState)308 void WorkerScriptController::rethrowExceptionFromImportedScript(PassRefPtrWillBeRawPtr<ErrorEvent> errorEvent, ExceptionState& exceptionState)
309 {
310 const String& errorMessage = errorEvent->message();
311 if (m_globalScopeExecutionState)
312 m_globalScopeExecutionState->m_errorEventFromImportedScript = errorEvent;
313 exceptionState.rethrowV8Exception(V8ThrowException::createGeneralError(errorMessage, m_isolate));
314 }
315
316 } // namespace blink
317