120 lines
4.3 KiB
C++
120 lines
4.3 KiB
C++
/*
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* Copyright (C) 2013-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "VMEntryScope.h"
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#include "Options.h"
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#include "SamplingProfiler.h"
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#include "VM.h"
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#include "WasmCapabilities.h"
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#include "WasmMachineThreads.h"
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#include "Watchdog.h"
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#include <wtf/SystemTracing.h>
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namespace JSC {
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VMEntryScope::VMEntryScope(VM& vm, JSGlobalObject* globalObject)
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: m_vm(vm)
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, m_globalObject(globalObject)
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{
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if (!vm.entryScope) {
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vm.entryScope = this;
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#if ENABLE(WEBASSEMBLY)
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if (Wasm::isSupported())
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Wasm::startTrackingCurrentThread();
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#endif
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#if HAVE(MACH_EXCEPTIONS)
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registerThreadForMachExceptionHandling(Thread::current());
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#endif
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vm.firePrimitiveGigacageEnabledIfNecessary();
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// Reset the date cache between JS invocations to force the VM to
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// observe time zone changes.
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// FIXME: We should clear it only when we know the timezone has been changed.
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// https://bugs.webkit.org/show_bug.cgi?id=218365
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vm.resetDateCache();
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if (vm.watchdog())
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vm.watchdog()->enteredVM();
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#if ENABLE(SAMPLING_PROFILER)
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{
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SamplingProfiler* samplingProfiler = vm.samplingProfiler();
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if (UNLIKELY(samplingProfiler))
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samplingProfiler->noticeVMEntry();
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}
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#endif
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if (UNLIKELY(Options::useTracePoints()))
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tracePoint(VMEntryScopeStart);
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}
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vm.clearLastException();
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}
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void VMEntryScope::addDidPopListener(Function<void ()>&& listener)
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{
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m_didPopListeners.append(WTFMove(listener));
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}
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VMEntryScope::~VMEntryScope()
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{
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if (m_vm.entryScope != this)
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return;
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ASSERT_WITH_MESSAGE(!m_vm.hasCheckpointOSRSideState(), "Exitting the VM but pending checkpoint side state still available");
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if (Options::useTracePoints())
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tracePoint(VMEntryScopeEnd);
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if (m_vm.watchdog())
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m_vm.watchdog()->exitedVM();
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m_vm.entryScope = nullptr;
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for (auto& listener : m_didPopListeners)
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listener();
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// If the trap bit is still set at this point, then it means that VMTraps::handleTraps()
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// has not yet been called for this termination request. As a result, we've not thrown a
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// TerminationException yet. Some client code relies on detecting the presence of the
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// TerminationException in order to signal that a termination was requested. As a result,
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// we want to stay in the TerminationInProgress state until VMTraps::handleTraps() (which
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// clears the trap bit) gets called, and the TerminationException gets thrown.
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//
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// Note: perhaps there's a better way for the client to know that a termination was
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// requested (after all, the request came from the client). However, this is how the
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// client code currently works. Changing that will take some significant effort to hunt
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// down all the places in client code that currently rely on this behavior.
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if (!m_vm.traps().needHandling(VMTraps::NeedTermination))
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m_vm.setTerminationInProgress(false);
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m_vm.clearScratchBuffers();
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}
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} // namespace JSC
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