mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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102 lines
4.1 KiB
C++
102 lines
4.1 KiB
C++
/*
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* Copyright (C) 2016-2019 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 "ThrowScope.h"
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#include "Exception.h"
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#include "JSCJSValueInlines.h"
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#include "VM.h"
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namespace JSC {
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#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
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ThrowScope::ThrowScope(VM& vm, ExceptionEventLocation location)
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: ExceptionScope(vm, location)
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{
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m_vm.verifyExceptionCheckNeedIsSatisfied(m_recursionDepth, m_location);
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}
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ThrowScope::~ThrowScope()
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{
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RELEASE_ASSERT(m_vm.m_topExceptionScope);
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if (!m_isReleased)
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m_vm.verifyExceptionCheckNeedIsSatisfied(m_recursionDepth, m_location);
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else {
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// If we released the scope, that means we're letting our callers do the
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// exception check. However, because our caller may be a LLInt or JIT
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// function (which always checks for exceptions but won't clear the
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// m_needExceptionCheck bit), we should clear m_needExceptionCheck here
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// and let code below decide if we need to simulate a re-throw.
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m_vm.m_needExceptionCheck = false;
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}
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bool willBeHandleByLLIntOrJIT = false;
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const void* previousScopeStackPosition = m_previousScope ? m_previousScope->stackPosition() : nullptr;
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void* topEntryFrame = m_vm.topEntryFrame;
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// If the topEntryFrame was pushed on the stack after the previousScope was instantiated,
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// then this throwScope will be returning to LLINT or JIT code that always do an exception
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// check. In that case, skip the simulated throw because the LLInt and JIT will be
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// checking for the exception their own way instead of calling ThrowScope::exception().
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if (topEntryFrame && previousScopeStackPosition > topEntryFrame)
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willBeHandleByLLIntOrJIT = true;
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if (!willBeHandleByLLIntOrJIT)
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simulateThrow();
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}
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Exception* ThrowScope::throwException(JSGlobalObject* globalObject, Exception* exception)
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{
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if (m_vm.exception() && m_vm.exception() != exception)
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m_vm.verifyExceptionCheckNeedIsSatisfied(m_recursionDepth, m_location);
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return m_vm.throwException(globalObject, exception);
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}
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Exception* ThrowScope::throwException(JSGlobalObject* globalObject, JSValue error)
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{
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if (!error.isCell() || error.isObject() || !jsDynamicCast<Exception*>(m_vm, error.asCell()))
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m_vm.verifyExceptionCheckNeedIsSatisfied(m_recursionDepth, m_location);
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return m_vm.throwException(globalObject, error);
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}
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void ThrowScope::simulateThrow()
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{
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RELEASE_ASSERT(m_vm.m_topExceptionScope);
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m_vm.m_simulatedThrowPointLocation = m_location;
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m_vm.m_simulatedThrowPointRecursionDepth = m_recursionDepth;
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m_vm.m_needExceptionCheck = true;
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if (UNLIKELY(Options::dumpSimulatedThrows()))
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m_vm.m_nativeStackTraceOfLastSimulatedThrow = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit());
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}
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#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
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} // namespace JSC
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