| /* |
| * Copyright (C) 2009, 2011 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| #include "config.h" |
| |
| #if ENABLE(WORKERS) |
| |
| #include "WorkerContextExecutionProxy.h" |
| |
| #include "DedicatedWorkerContext.h" |
| #include "Event.h" |
| #include "ScriptCallStack.h" |
| #include "ScriptRunner.h" |
| #include "ScriptSourceCode.h" |
| #include "SharedWorker.h" |
| #include "SharedWorkerContext.h" |
| #include "V8Binding.h" |
| #include "V8DOMWindowShell.h" |
| #include "V8DedicatedWorkerContext.h" |
| #include "V8GCController.h" |
| #include "V8ObjectConstructor.h" |
| #include "V8PerContextData.h" |
| #include "V8RecursionScope.h" |
| #include "V8SharedWorkerContext.h" |
| #include "Worker.h" |
| #include "WorkerContext.h" |
| #include "WorkerScriptController.h" |
| #include "WrapperTypeInfo.h" |
| #include <wtf/text/CString.h> |
| |
| namespace WebCore { |
| |
| static void reportFatalErrorInV8(const char* location, const char* message) |
| { |
| // FIXME: We temporarily deal with V8 internal error situations such as out-of-memory by crashing the worker. |
| CRASH(); |
| } |
| |
| static void v8MessageHandler(v8::Handle<v8::Message> message, v8::Handle<v8::Value> data) |
| { |
| static bool isReportingException = false; |
| // Exceptions that occur in error handler should be ignored since in that case |
| // WorkerContext::reportException will send the exception to the worker object. |
| if (isReportingException) |
| return; |
| isReportingException = true; |
| |
| // During the frame teardown, there may not be a valid context. |
| if (ScriptExecutionContext* context = getScriptExecutionContext()) { |
| String errorMessage = toWebCoreString(message->Get()); |
| int lineNumber = message->GetLineNumber(); |
| String sourceURL = toWebCoreString(message->GetScriptResourceName()); |
| context->reportException(errorMessage, lineNumber, sourceURL, 0); |
| } |
| |
| isReportingException = false; |
| } |
| |
| WorkerContextExecutionProxy::WorkerContextExecutionProxy(WorkerContext* workerContext) |
| : m_workerContext(workerContext) |
| , m_disableEvalPending(String()) |
| { |
| initIsolate(); |
| } |
| |
| WorkerContextExecutionProxy::~WorkerContextExecutionProxy() |
| { |
| dispose(); |
| } |
| |
| void WorkerContextExecutionProxy::dispose() |
| { |
| m_perContextData.clear(); |
| m_context.clear(); |
| } |
| |
| void WorkerContextExecutionProxy::initIsolate() |
| { |
| // Tell V8 not to call the default OOM handler, binding code will handle it. |
| v8::V8::IgnoreOutOfMemoryException(); |
| v8::V8::SetFatalErrorHandler(reportFatalErrorInV8); |
| |
| v8::V8::AddGCPrologueCallback(&V8GCController::gcPrologue); |
| v8::V8::AddGCEpilogueCallback(&V8GCController::gcEpilogue); |
| |
| // FIXME: Remove the following 2 lines when V8 default has changed. |
| const char es5ReadonlyFlag[] = "--es5_readonly"; |
| v8::V8::SetFlagsFromString(es5ReadonlyFlag, sizeof(es5ReadonlyFlag)); |
| |
| v8::ResourceConstraints resource_constraints; |
| uint32_t here; |
| resource_constraints.set_stack_limit(&here - kWorkerMaxStackSize / sizeof(uint32_t*)); |
| v8::SetResourceConstraints(&resource_constraints); |
| |
| V8PerIsolateData::ensureInitialized(v8::Isolate::GetCurrent()); |
| } |
| |
| bool WorkerContextExecutionProxy::initializeIfNeeded() |
| { |
| // Bail out if the context has already been initialized. |
| if (!m_context.isEmpty()) |
| return true; |
| |
| // Setup the security handlers and message listener. This only has |
| // to be done once. |
| static bool isV8Initialized = false; |
| if (!isV8Initialized) |
| v8::V8::AddMessageListener(&v8MessageHandler); |
| |
| // Create a new environment |
| v8::Persistent<v8::ObjectTemplate> globalTemplate; |
| m_context.adopt(v8::Context::New(0, globalTemplate)); |
| if (m_context.isEmpty()) |
| return false; |
| |
| // Starting from now, use local context only. |
| v8::Local<v8::Context> context = v8::Local<v8::Context>::New(m_context.get()); |
| |
| v8::Context::Scope scope(context); |
| |
| m_perContextData = V8PerContextData::create(m_context.get()); |
| if (!m_perContextData->init()) { |
| dispose(); |
| return false; |
| } |
| |
| // Set DebugId for the new context. |
| context->SetData(v8::String::New("worker")); |
| |
| // Create a new JS object and use it as the prototype for the shadow global object. |
| WrapperTypeInfo* contextType = &V8DedicatedWorkerContext::info; |
| #if ENABLE(SHARED_WORKERS) |
| if (!m_workerContext->isDedicatedWorkerContext()) |
| contextType = &V8SharedWorkerContext::info; |
| #endif |
| v8::Handle<v8::Function> workerContextConstructor = m_perContextData->constructorForType(contextType); |
| v8::Local<v8::Object> jsWorkerContext = V8ObjectConstructor::newInstance(workerContextConstructor); |
| // Bail out if allocation failed. |
| if (jsWorkerContext.IsEmpty()) { |
| dispose(); |
| return false; |
| } |
| |
| // Wrap the object. |
| V8DOMWrapper::setDOMWrapper(jsWorkerContext, contextType, m_workerContext); |
| |
| V8DOMWrapper::setJSWrapperForDOMObject(PassRefPtr<WorkerContext>(m_workerContext), jsWorkerContext); |
| |
| // Insert the object instance as the prototype of the shadow object. |
| v8::Handle<v8::Object> globalObject = v8::Handle<v8::Object>::Cast(m_context->Global()->GetPrototype()); |
| globalObject->SetPrototype(jsWorkerContext); |
| |
| return true; |
| } |
| |
| ScriptValue WorkerContextExecutionProxy::evaluate(const String& script, const String& fileName, const TextPosition& scriptStartPosition, WorkerContextExecutionState* state) |
| { |
| V8GCController::checkMemoryUsage(); |
| |
| v8::HandleScope hs; |
| |
| if (!initializeIfNeeded()) |
| return ScriptValue(); |
| |
| if (!m_disableEvalPending.isEmpty()) { |
| m_context->AllowCodeGenerationFromStrings(false); |
| m_context->SetErrorMessageForCodeGenerationFromStrings(v8String(m_disableEvalPending)); |
| m_disableEvalPending = String(); |
| } |
| |
| v8::Context::Scope scope(m_context.get()); |
| |
| v8::TryCatch exceptionCatcher; |
| |
| v8::Local<v8::String> scriptString = v8ExternalString(script); |
| v8::Handle<v8::Script> compiledScript = ScriptSourceCode::compileScript(scriptString, fileName, scriptStartPosition); |
| v8::Local<v8::Value> result = ScriptRunner::runCompiledScript(compiledScript, m_workerContext); |
| |
| if (!exceptionCatcher.CanContinue()) { |
| m_workerContext->script()->forbidExecution(); |
| return ScriptValue(); |
| } |
| |
| if (exceptionCatcher.HasCaught()) { |
| v8::Local<v8::Message> message = exceptionCatcher.Message(); |
| state->hadException = true; |
| state->errorMessage = toWebCoreString(message->Get()); |
| state->lineNumber = message->GetLineNumber(); |
| state->sourceURL = toWebCoreString(message->GetScriptResourceName()); |
| if (m_workerContext->sanitizeScriptError(state->errorMessage, state->lineNumber, state->sourceURL)) |
| state->exception = throwError(GeneralError, state->errorMessage.utf8().data()); |
| else |
| state->exception = ScriptValue(exceptionCatcher.Exception()); |
| |
| exceptionCatcher.Reset(); |
| } else |
| state->hadException = false; |
| |
| if (result.IsEmpty() || result->IsUndefined()) |
| return ScriptValue(); |
| |
| return ScriptValue(result); |
| } |
| |
| void WorkerContextExecutionProxy::setEvalAllowed(bool enable, const String& errorMessage) |
| { |
| m_disableEvalPending = enable ? String() : errorMessage; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WORKERS) |