blob: fbc2de3826a3ca1432771cd084b16f068fa6f901 [file] [log] [blame]
/*
* Copyright (C) 2013-2018 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 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 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"
#include "VMEntryScope.h"
#include "DisallowVMReentry.h"
#include "JSGlobalObject.h"
#include "Options.h"
#include "SamplingProfiler.h"
#include "VM.h"
#include "Watchdog.h"
#include <wtf/StackBounds.h>
#include <wtf/SystemTracing.h>
namespace JSC {
VMEntryScope::VMEntryScope(VM& vm, JSGlobalObject* globalObject)
: m_vm(vm)
, m_globalObject(globalObject)
{
ASSERT(!DisallowVMReentry::isInEffectOnCurrentThread());
ASSERT(Thread::current().stack().isGrowingDownward());
if (!vm.entryScope) {
vm.entryScope = this;
// Reset the date cache between JS invocations to force the VM to
// observe time zone changes.
vm.resetDateCache();
if (vm.watchdog())
vm.watchdog()->enteredVM();
#if ENABLE(SAMPLING_PROFILER)
if (SamplingProfiler* samplingProfiler = vm.samplingProfiler())
samplingProfiler->noticeVMEntry();
#endif
if (Options::useTracePoints())
tracePoint(VMEntryScopeStart);
}
vm.clearLastException();
}
void VMEntryScope::addDidPopListener(Function<void ()>&& listener)
{
m_didPopListeners.append(WTFMove(listener));
}
VMEntryScope::~VMEntryScope()
{
if (m_vm.entryScope != this)
return;
if (Options::useTracePoints())
tracePoint(VMEntryScopeEnd);
if (m_vm.watchdog())
m_vm.watchdog()->exitedVM();
m_vm.entryScope = nullptr;
for (auto& listener : m_didPopListeners)
listener();
m_vm.clearScratchBuffers();
}
} // namespace JSC