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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2011, 2012 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "WorkerScriptController.h"
#include "JSDOMBinding.h"
#include "JSDedicatedWorkerGlobalScope.h"
#include "ScriptSourceCode.h"
#include "ScriptValue.h"
#include "WebCoreJSClientData.h"
#include "WorkerGlobalScope.h"
#include "WorkerObjectProxy.h"
#include "WorkerScriptDebugServer.h"
#include "WorkerThread.h"
#include <heap/StrongInlines.h>
#include <interpreter/Interpreter.h>
#include <runtime/Completion.h>
#include <runtime/ExceptionHelpers.h>
#include <runtime/Error.h>
#include <runtime/JSLock.h>
#if ENABLE(SHARED_WORKERS)
#include "JSSharedWorkerGlobalScope.h"
#endif
using namespace JSC;
namespace WebCore {
WorkerScriptController::WorkerScriptController(WorkerGlobalScope* workerGlobalScope)
: m_vm(VM::create())
, m_workerGlobalScope(workerGlobalScope)
, m_workerGlobalScopeWrapper(*m_vm)
, m_executionForbidden(false)
{
initNormalWorldClientData(m_vm.get());
}
WorkerScriptController::~WorkerScriptController()
{
JSLockHolder lock(vm());
m_workerGlobalScopeWrapper.clear();
m_vm.clear();
}
void WorkerScriptController::initScript()
{
ASSERT(!m_workerGlobalScopeWrapper);
JSLockHolder lock(m_vm.get());
// Explicitly protect the global object's prototype so it isn't collected
// when we allocate the global object. (Once the global object is fully
// constructed, it can mark its own prototype.)
Structure* workerGlobalScopePrototypeStructure = JSWorkerGlobalScopePrototype::createStructure(*m_vm, 0, jsNull());
Strong<JSWorkerGlobalScopePrototype> workerGlobalScopePrototype(*m_vm, JSWorkerGlobalScopePrototype::create(*m_vm, 0, workerGlobalScopePrototypeStructure));
if (m_workerGlobalScope->isDedicatedWorkerGlobalScope()) {
Structure* dedicatedContextPrototypeStructure = JSDedicatedWorkerGlobalScopePrototype::createStructure(*m_vm, 0, workerGlobalScopePrototype.get());
Strong<JSDedicatedWorkerGlobalScopePrototype> dedicatedContextPrototype(*m_vm, JSDedicatedWorkerGlobalScopePrototype::create(*m_vm, 0, dedicatedContextPrototypeStructure));
Structure* structure = JSDedicatedWorkerGlobalScope::createStructure(*m_vm, 0, dedicatedContextPrototype.get());
m_workerGlobalScopeWrapper.set(*m_vm, JSDedicatedWorkerGlobalScope::create(*m_vm, structure, static_cast<DedicatedWorkerGlobalScope*>(m_workerGlobalScope)));
workerGlobalScopePrototypeStructure->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
dedicatedContextPrototypeStructure->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
ASSERT(structure->globalObject() == m_workerGlobalScopeWrapper);
ASSERT(m_workerGlobalScopeWrapper->structure()->globalObject() == m_workerGlobalScopeWrapper);
workerGlobalScopePrototype->structure()->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
dedicatedContextPrototype->structure()->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
#if ENABLE(SHARED_WORKERS)
} else {
ASSERT(m_workerGlobalScope->isSharedWorkerGlobalScope());
Structure* sharedContextPrototypeStructure = JSSharedWorkerGlobalScopePrototype::createStructure(*m_vm, 0, workerGlobalScopePrototype.get());
Strong<JSSharedWorkerGlobalScopePrototype> sharedContextPrototype(*m_vm, JSSharedWorkerGlobalScopePrototype::create(*m_vm, 0, sharedContextPrototypeStructure));
Structure* structure = JSSharedWorkerGlobalScope::createStructure(*m_vm, 0, sharedContextPrototype.get());
m_workerGlobalScopeWrapper.set(*m_vm, JSSharedWorkerGlobalScope::create(*m_vm, structure, static_cast<SharedWorkerGlobalScope*>(m_workerGlobalScope)));
workerGlobalScopePrototype->structure()->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
sharedContextPrototype->structure()->setGlobalObject(*m_vm, m_workerGlobalScopeWrapper.get());
#endif
}
ASSERT(m_workerGlobalScopeWrapper->globalObject() == m_workerGlobalScopeWrapper);
ASSERT(asObject(m_workerGlobalScopeWrapper->prototype())->globalObject() == m_workerGlobalScopeWrapper);
}
void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode)
{
if (isExecutionForbidden())
return;
ScriptValue exception;
evaluate(sourceCode, &exception);
if (exception.jsValue()) {
JSLockHolder lock(vm());
reportException(m_workerGlobalScopeWrapper->globalExec(), exception.jsValue());
}
}
void WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, ScriptValue* exception)
{
if (isExecutionForbidden())
return;
initScriptIfNeeded();
ExecState* exec = m_workerGlobalScopeWrapper->globalExec();
JSLockHolder lock(exec);
JSValue evaluationException;
JSC::evaluate(exec, sourceCode.jsSourceCode(), m_workerGlobalScopeWrapper.get(), &evaluationException);
if ((evaluationException && isTerminatedExecutionException(evaluationException)) || m_workerGlobalScopeWrapper->vm().watchdog.didFire()) {
forbidExecution();
return;
}
if (evaluationException) {
String errorMessage;
int lineNumber = 0;
int columnNumber = 0;
String sourceURL = sourceCode.url().string();
if (m_workerGlobalScope->sanitizeScriptError(errorMessage, lineNumber, columnNumber, sourceURL, sourceCode.cachedScript()))
*exception = ScriptValue(*m_vm, throwError(exec, createError(exec, errorMessage.impl())));
else
*exception = ScriptValue(*m_vm, evaluationException);
}
}
void WorkerScriptController::setException(const ScriptValue& exception)
{
throwError(m_workerGlobalScopeWrapper->globalExec(), exception.jsValue());
}
void WorkerScriptController::scheduleExecutionTermination()
{
// The mutex provides a memory barrier to ensure that once
// termination is scheduled, isExecutionTerminating will
// accurately reflect that state when called from another thread.
MutexLocker locker(m_scheduledTerminationMutex);
m_vm->watchdog.fire();
}
bool WorkerScriptController::isExecutionTerminating() const
{
// See comments in scheduleExecutionTermination regarding mutex usage.
MutexLocker locker(m_scheduledTerminationMutex);
return m_vm->watchdog.didFire();
}
void WorkerScriptController::forbidExecution()
{
ASSERT(m_workerGlobalScope->isContextThread());
m_executionForbidden = true;
}
bool WorkerScriptController::isExecutionForbidden() const
{
ASSERT(m_workerGlobalScope->isContextThread());
return m_executionForbidden;
}
void WorkerScriptController::disableEval(const String& errorMessage)
{
initScriptIfNeeded();
JSLockHolder lock(vm());
m_workerGlobalScopeWrapper->setEvalEnabled(false, errorMessage);
}
void WorkerScriptController::attachDebugger(JSC::Debugger* debugger)
{
initScriptIfNeeded();
debugger->attach(m_workerGlobalScopeWrapper->globalObject());
}
void WorkerScriptController::detachDebugger(JSC::Debugger* debugger)
{
debugger->detach(m_workerGlobalScopeWrapper->globalObject());
}
} // namespace WebCore
#endif // ENABLE(WORKERS)
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