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/*
* Copyright (C) 2008 Apple 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 "JSDedicatedWorkerContext.h"
#include "JSSharedWorkerContext.h"
#include "ScriptSourceCode.h"
#include "ScriptValue.h"
#include "WebCoreJSClientData.h"
#include "WorkerContext.h"
#include "WorkerObjectProxy.h"
#include "WorkerThread.h"
#include <interpreter/Interpreter.h>
#include <runtime/Completion.h>
#include <runtime/Completion.h>
#include <runtime/JSLock.h>
using namespace JSC;
namespace WebCore {
WorkerScriptController::WorkerScriptController(WorkerContext* workerContext)
: m_globalData(JSGlobalData::create())
, m_workerContext(workerContext)
, m_executionForbidden(false)
{
m_globalData->clientData = new WebCoreJSClientData(m_globalData.get());
}
WorkerScriptController::~WorkerScriptController()
{
m_workerContextWrapper = 0; // Unprotect the global object.
m_globalData->heap.destroy();
}
void WorkerScriptController::initScript()
{
ASSERT(!m_workerContextWrapper);
JSLock lock(SilenceAssertionsOnly);
// 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.)
RefPtr<Structure> workerContextPrototypeStructure = JSWorkerContextPrototype::createStructure(jsNull());
ProtectedPtr<JSWorkerContextPrototype> workerContextPrototype = new (m_globalData.get()) JSWorkerContextPrototype(workerContextPrototypeStructure.release());
if (m_workerContext->isDedicatedWorkerContext()) {
RefPtr<Structure> dedicatedContextPrototypeStructure = JSDedicatedWorkerContextPrototype::createStructure(workerContextPrototype);
ProtectedPtr<JSDedicatedWorkerContextPrototype> dedicatedContextPrototype = new (m_globalData.get()) JSDedicatedWorkerContextPrototype(dedicatedContextPrototypeStructure.release());
RefPtr<Structure> structure = JSDedicatedWorkerContext::createStructure(dedicatedContextPrototype);
m_workerContextWrapper = new (m_globalData.get()) JSDedicatedWorkerContext(structure.release(), m_workerContext->toDedicatedWorkerContext());
#if ENABLE(SHARED_WORKERS)
} else {
ASSERT(m_workerContext->isSharedWorkerContext());
RefPtr<Structure> sharedContextPrototypeStructure = JSSharedWorkerContextPrototype::createStructure(workerContextPrototype);
ProtectedPtr<JSSharedWorkerContextPrototype> sharedContextPrototype = new (m_globalData.get()) JSSharedWorkerContextPrototype(sharedContextPrototypeStructure.release());
RefPtr<Structure> structure = JSSharedWorkerContext::createStructure(sharedContextPrototype);
m_workerContextWrapper = new (m_globalData.get()) JSSharedWorkerContext(structure.release(), m_workerContext->toSharedWorkerContext());
#endif
}
}
ScriptValue WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode)
{
{
MutexLocker lock(m_sharedDataMutex);
if (m_executionForbidden)
return JSValue();
}
ScriptValue exception;
ScriptValue result = evaluate(sourceCode, &exception);
if (exception.jsValue()) {
JSLock lock(SilenceAssertionsOnly);
reportException(m_workerContextWrapper->globalExec(), exception.jsValue());
}
return result;
}
ScriptValue WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode, ScriptValue* exception)
{
{
MutexLocker lock(m_sharedDataMutex);
if (m_executionForbidden)
return JSValue();
}
initScriptIfNeeded();
JSLock lock(SilenceAssertionsOnly);
ExecState* exec = m_workerContextWrapper->globalExec();
m_workerContextWrapper->globalData()->timeoutChecker.start();
Completion comp = JSC::evaluate(exec, exec->dynamicGlobalObject()->globalScopeChain(), sourceCode.jsSourceCode(), m_workerContextWrapper);
m_workerContextWrapper->globalData()->timeoutChecker.stop();
if (comp.complType() == Normal || comp.complType() == ReturnValue)
return comp.value();
if (comp.complType() == Throw)
*exception = comp.value();
return JSValue();
}
void WorkerScriptController::setException(ScriptValue exception)
{
m_workerContextWrapper->globalExec()->setException(exception.jsValue());
}
void WorkerScriptController::forbidExecution()
{
// This function is called from another thread.
// Mutex protection for m_executionForbidden is needed to guarantee that the value is synchronized between processors, because
// if it were not, the worker could re-enter JSC::evaluate(), but with timeout already reset.
// It is not critical for Interpreter::m_timeoutTime to be synchronized, we just rely on it reaching the worker thread's processor sooner or later.
MutexLocker lock(m_sharedDataMutex);
m_executionForbidden = true;
m_globalData->timeoutChecker.setTimeoutInterval(1); // 1ms is the smallest timeout that can be set.
}
} // namespace WebCore
#endif // ENABLE(WORKERS)
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