1 | /* |
2 | * Copyright (C) 2008-2017 Apple Inc. All Rights Reserved. |
3 | * Copyright (C) 2011, 2012 Google Inc. All Rights Reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
15 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
17 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
18 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
19 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
20 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
21 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
22 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
25 | */ |
26 | |
27 | #include "config.h" |
28 | #include "WorkerScriptController.h" |
29 | |
30 | #include "JSDOMBinding.h" |
31 | #include "JSDedicatedWorkerGlobalScope.h" |
32 | #include "JSEventTarget.h" |
33 | #include "JSExecState.h" |
34 | #include "JSServiceWorkerGlobalScope.h" |
35 | #include "ScriptSourceCode.h" |
36 | #include "WebCoreJSClientData.h" |
37 | #include "WorkerConsoleClient.h" |
38 | #include "WorkerGlobalScope.h" |
39 | #include <JavaScriptCore/Completion.h> |
40 | #include <JavaScriptCore/Exception.h> |
41 | #include <JavaScriptCore/ExceptionHelpers.h> |
42 | #include <JavaScriptCore/GCActivityCallback.h> |
43 | #include <JavaScriptCore/JSCInlines.h> |
44 | #include <JavaScriptCore/JSLock.h> |
45 | #include <JavaScriptCore/PromiseDeferredTimer.h> |
46 | #include <JavaScriptCore/StrongInlines.h> |
47 | |
48 | namespace WebCore { |
49 | using namespace JSC; |
50 | |
51 | WorkerScriptController::WorkerScriptController(WorkerGlobalScope* workerGlobalScope) |
52 | : m_vm(VM::create()) |
53 | , m_workerGlobalScope(workerGlobalScope) |
54 | , m_workerGlobalScopeWrapper(*m_vm) |
55 | { |
56 | m_vm->heap.acquireAccess(); // It's not clear that we have good discipline for heap access, so turn it on permanently. |
57 | JSVMClientData::initNormalWorld(m_vm.get()); |
58 | } |
59 | |
60 | WorkerScriptController::~WorkerScriptController() |
61 | { |
62 | JSLockHolder lock(vm()); |
63 | if (m_workerGlobalScopeWrapper) { |
64 | m_workerGlobalScopeWrapper->clearDOMGuardedObjects(); |
65 | m_workerGlobalScopeWrapper->setConsoleClient(nullptr); |
66 | m_consoleClient = nullptr; |
67 | } |
68 | m_workerGlobalScopeWrapper.clear(); |
69 | m_vm = nullptr; |
70 | } |
71 | |
72 | void WorkerScriptController::initScript() |
73 | { |
74 | ASSERT(!m_workerGlobalScopeWrapper); |
75 | |
76 | JSLockHolder lock(m_vm.get()); |
77 | |
78 | // Explicitly protect the global object's prototype so it isn't collected |
79 | // when we allocate the global object. (Once the global object is fully |
80 | // constructed, it can mark its own prototype.) |
81 | if (m_workerGlobalScope->isDedicatedWorkerGlobalScope()) { |
82 | Structure* dedicatedContextPrototypeStructure = JSDedicatedWorkerGlobalScopePrototype::createStructure(*m_vm, nullptr, jsNull()); |
83 | Strong<JSDedicatedWorkerGlobalScopePrototype> dedicatedContextPrototype(*m_vm, JSDedicatedWorkerGlobalScopePrototype::create(*m_vm, nullptr, dedicatedContextPrototypeStructure)); |
84 | Structure* structure = JSDedicatedWorkerGlobalScope::createStructure(*m_vm, nullptr, dedicatedContextPrototype.get()); |
85 | auto* proxyStructure = JSProxy::createStructure(*m_vm, nullptr, jsNull(), PureForwardingProxyType); |
86 | auto* proxy = JSProxy::create(*m_vm, proxyStructure); |
87 | |
88 | m_workerGlobalScopeWrapper.set(*m_vm, JSDedicatedWorkerGlobalScope::create(*m_vm, structure, static_cast<DedicatedWorkerGlobalScope&>(*m_workerGlobalScope), proxy)); |
89 | dedicatedContextPrototypeStructure->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
90 | ASSERT(structure->globalObject() == m_workerGlobalScopeWrapper); |
91 | ASSERT(m_workerGlobalScopeWrapper->structure(*m_vm)->globalObject() == m_workerGlobalScopeWrapper); |
92 | dedicatedContextPrototype->structure(*m_vm)->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
93 | dedicatedContextPrototype->structure(*m_vm)->setPrototypeWithoutTransition(*m_vm, JSWorkerGlobalScope::prototype(*m_vm, *m_workerGlobalScopeWrapper.get())); |
94 | |
95 | proxy->setTarget(*m_vm, m_workerGlobalScopeWrapper.get()); |
96 | proxy->structure(*m_vm)->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
97 | #if ENABLE(SERVICE_WORKER) |
98 | } else if (m_workerGlobalScope->isServiceWorkerGlobalScope()) { |
99 | Structure* contextPrototypeStructure = JSServiceWorkerGlobalScopePrototype::createStructure(*m_vm, nullptr, jsNull()); |
100 | Strong<JSServiceWorkerGlobalScopePrototype> contextPrototype(*m_vm, JSServiceWorkerGlobalScopePrototype::create(*m_vm, nullptr, contextPrototypeStructure)); |
101 | Structure* structure = JSServiceWorkerGlobalScope::createStructure(*m_vm, nullptr, contextPrototype.get()); |
102 | auto* proxyStructure = JSProxy::createStructure(*m_vm, nullptr, jsNull(), PureForwardingProxyType); |
103 | auto* proxy = JSProxy::create(*m_vm, proxyStructure); |
104 | |
105 | m_workerGlobalScopeWrapper.set(*m_vm, JSServiceWorkerGlobalScope::create(*m_vm, structure, static_cast<ServiceWorkerGlobalScope&>(*m_workerGlobalScope), proxy)); |
106 | contextPrototypeStructure->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
107 | ASSERT(structure->globalObject() == m_workerGlobalScopeWrapper); |
108 | ASSERT(m_workerGlobalScopeWrapper->structure()->globalObject() == m_workerGlobalScopeWrapper); |
109 | contextPrototype->structure(*m_vm)->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
110 | contextPrototype->structure(*m_vm)->setPrototypeWithoutTransition(*m_vm, JSWorkerGlobalScope::prototype(*m_vm, *m_workerGlobalScopeWrapper.get())); |
111 | |
112 | proxy->setTarget(*m_vm, m_workerGlobalScopeWrapper.get()); |
113 | proxy->structure(*m_vm)->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get()); |
114 | #endif |
115 | } |
116 | |
117 | ASSERT(m_workerGlobalScopeWrapper->globalObject() == m_workerGlobalScopeWrapper); |
118 | ASSERT(asObject(m_workerGlobalScopeWrapper->getPrototypeDirect(*m_vm))->globalObject() == m_workerGlobalScopeWrapper); |
119 | |
120 | m_consoleClient = std::make_unique<WorkerConsoleClient>(*m_workerGlobalScope); |
121 | m_workerGlobalScopeWrapper->setConsoleClient(m_consoleClient.get()); |
122 | } |
123 | |
124 | void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, String* returnedExceptionMessage) |
125 | { |
126 | if (isExecutionForbidden()) |
127 | return; |
128 | |
129 | NakedPtr<JSC::Exception> exception; |
130 | evaluate(sourceCode, exception, returnedExceptionMessage); |
131 | if (exception) { |
132 | JSLockHolder lock(vm()); |
133 | reportException(m_workerGlobalScopeWrapper->globalExec(), exception); |
134 | } |
135 | } |
136 | |
137 | void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, NakedPtr<JSC::Exception>& returnedException, String* returnedExceptionMessage) |
138 | { |
139 | if (isExecutionForbidden()) |
140 | return; |
141 | |
142 | initScriptIfNeeded(); |
143 | |
144 | auto& state = *m_workerGlobalScopeWrapper->globalExec(); |
145 | VM& vm = state.vm(); |
146 | JSLockHolder lock { vm }; |
147 | |
148 | JSExecState::profiledEvaluate(&state, JSC::ProfilingReason::Other, sourceCode.jsSourceCode(), m_workerGlobalScopeWrapper->globalThis(), returnedException); |
149 | |
150 | if ((returnedException && isTerminatedExecutionException(vm, returnedException)) || isTerminatingExecution()) { |
151 | forbidExecution(); |
152 | return; |
153 | } |
154 | |
155 | if (returnedException) { |
156 | if (m_workerGlobalScope->canIncludeErrorDetails(sourceCode.cachedScript(), sourceCode.url().string())) { |
157 | // FIXME: It's not great that this can run arbitrary code to string-ify the value of the exception. |
158 | // Do we need to do anything to handle that properly, if it, say, raises another exception? |
159 | if (returnedExceptionMessage) |
160 | *returnedExceptionMessage = returnedException->value().toWTFString(&state); |
161 | } else { |
162 | // Overwrite the detailed error with a generic error. |
163 | String genericErrorMessage { "Script error."_s }; |
164 | if (returnedExceptionMessage) |
165 | *returnedExceptionMessage = genericErrorMessage; |
166 | returnedException = JSC::Exception::create(vm, createError(&state, genericErrorMessage)); |
167 | } |
168 | } |
169 | } |
170 | |
171 | void WorkerScriptController::setException(JSC::Exception* exception) |
172 | { |
173 | JSC::ExecState* exec = m_workerGlobalScopeWrapper->globalExec(); |
174 | VM& vm = exec->vm(); |
175 | auto scope = DECLARE_THROW_SCOPE(vm); |
176 | throwException(exec, scope, exception); |
177 | } |
178 | |
179 | void WorkerScriptController::scheduleExecutionTermination() |
180 | { |
181 | if (m_isTerminatingExecution) |
182 | return; |
183 | |
184 | { |
185 | // The mutex provides a memory barrier to ensure that once |
186 | // termination is scheduled, isTerminatingExecution() will |
187 | // accurately reflect that state when called from another thread. |
188 | LockHolder locker(m_scheduledTerminationMutex); |
189 | m_isTerminatingExecution = true; |
190 | } |
191 | m_vm->notifyNeedTermination(); |
192 | } |
193 | |
194 | bool WorkerScriptController::isTerminatingExecution() const |
195 | { |
196 | // See comments in scheduleExecutionTermination regarding mutex usage. |
197 | LockHolder locker(m_scheduledTerminationMutex); |
198 | return m_isTerminatingExecution; |
199 | } |
200 | |
201 | void WorkerScriptController::forbidExecution() |
202 | { |
203 | ASSERT(m_workerGlobalScope->isContextThread()); |
204 | m_executionForbidden = true; |
205 | } |
206 | |
207 | bool WorkerScriptController::isExecutionForbidden() const |
208 | { |
209 | ASSERT(m_workerGlobalScope->isContextThread()); |
210 | return m_executionForbidden; |
211 | } |
212 | |
213 | void WorkerScriptController::disableEval(const String& errorMessage) |
214 | { |
215 | initScriptIfNeeded(); |
216 | JSLockHolder lock{vm()}; |
217 | |
218 | m_workerGlobalScopeWrapper->setEvalEnabled(false, errorMessage); |
219 | } |
220 | |
221 | void WorkerScriptController::disableWebAssembly(const String& errorMessage) |
222 | { |
223 | initScriptIfNeeded(); |
224 | JSLockHolder lock{vm()}; |
225 | |
226 | m_workerGlobalScopeWrapper->setWebAssemblyEnabled(false, errorMessage); |
227 | } |
228 | |
229 | void WorkerScriptController::releaseHeapAccess() |
230 | { |
231 | m_vm->heap.releaseAccess(); |
232 | } |
233 | |
234 | void WorkerScriptController::acquireHeapAccess() |
235 | { |
236 | m_vm->heap.acquireAccess(); |
237 | } |
238 | |
239 | void WorkerScriptController::addTimerSetNotification(JSC::JSRunLoopTimer::TimerNotificationCallback callback) |
240 | { |
241 | auto processTimer = [&] (JSRunLoopTimer* timer) { |
242 | if (!timer) |
243 | return; |
244 | timer->addTimerSetNotification(callback); |
245 | }; |
246 | |
247 | processTimer(m_vm->heap.fullActivityCallback()); |
248 | processTimer(m_vm->heap.edenActivityCallback()); |
249 | processTimer(m_vm->promiseDeferredTimer.get()); |
250 | } |
251 | |
252 | void WorkerScriptController::removeTimerSetNotification(JSC::JSRunLoopTimer::TimerNotificationCallback callback) |
253 | { |
254 | auto processTimer = [&] (JSRunLoopTimer* timer) { |
255 | if (!timer) |
256 | return; |
257 | timer->removeTimerSetNotification(callback); |
258 | }; |
259 | |
260 | processTimer(m_vm->heap.fullActivityCallback()); |
261 | processTimer(m_vm->heap.edenActivityCallback()); |
262 | processTimer(m_vm->promiseDeferredTimer.get()); |
263 | } |
264 | |
265 | void WorkerScriptController::attachDebugger(JSC::Debugger* debugger) |
266 | { |
267 | initScriptIfNeeded(); |
268 | debugger->attach(m_workerGlobalScopeWrapper->globalObject()); |
269 | } |
270 | |
271 | void WorkerScriptController::detachDebugger(JSC::Debugger* debugger) |
272 | { |
273 | debugger->detach(m_workerGlobalScopeWrapper->globalObject(), JSC::Debugger::TerminatingDebuggingSession); |
274 | } |
275 | |
276 | } // namespace WebCore |
277 | |