/* * Copyright (C) 2013-2020 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 "Options.h" #include "SamplingProfiler.h" #include "VM.h" #include "WasmCapabilities.h" #include "WasmMachineThreads.h" #include "Watchdog.h" #include <wtf/SystemTracing.h> namespace JSC { VMEntryScope::VMEntryScope(VM& vm, JSGlobalObject* globalObject) : m_vm(vm) , m_globalObject(globalObject) { if (!vm.entryScope) { vm.entryScope = this; #if ENABLE(WEBASSEMBLY) if (Wasm::isSupported()) Wasm::startTrackingCurrentThread(); #endif #if HAVE(MACH_EXCEPTIONS) registerThreadForMachExceptionHandling(Thread::current()); #endif vm.firePrimitiveGigacageEnabledIfNecessary(); // Reset the date cache between JS invocations to force the VM to // observe time zone changes. // FIXME: We should clear it only when we know the timezone has been changed. // https://bugs.webkit.org/show_bug.cgi?id=218365 vm.resetDateCache(); if (vm.watchdog()) vm.watchdog()->enteredVM(); #if ENABLE(SAMPLING_PROFILER) { SamplingProfiler* samplingProfiler = vm.samplingProfiler(); if (UNLIKELY(samplingProfiler)) samplingProfiler->noticeVMEntry(); } #endif if (UNLIKELY(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; ASSERT_WITH_MESSAGE(!m_vm.hasCheckpointOSRSideState(), "Exitting the VM but pending checkpoint side state still available"); 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