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/*
* Copyright (C) 2016-2022 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.
*/
#pragma once
#include "ExceptionScope.h"
namespace JSC {
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
// If a function can clear JS exceptions, it should declare a CatchScope at the
// top of the function (as early as possible) using the DECLARE_CATCH_SCOPE macro.
// Declaring a CatchScope in a function means that the function intends to clear
// pending exceptions before returning to its caller.
class CatchScope : public ExceptionScope {
public:
JS_EXPORT_PRIVATE CatchScope(VM&, ExceptionEventLocation);
CatchScope(const CatchScope&) = delete;
CatchScope(CatchScope&&) = default;
JS_EXPORT_PRIVATE ~CatchScope();
void clearException();
bool clearExceptionExceptTermination();
};
#define DECLARE_CATCH_SCOPE(vm__) \
JSC::CatchScope((vm__), JSC::ExceptionEventLocation(EXCEPTION_SCOPE_POSITION_FOR_ASAN(vm__), __FUNCTION__, __FILE__, __LINE__))
#else // not ENABLE(EXCEPTION_SCOPE_VERIFICATION)
class CatchScope : public ExceptionScope {
public:
ALWAYS_INLINE CatchScope(VM& vm)
: ExceptionScope(vm)
{ }
CatchScope(const CatchScope&) = delete;
CatchScope(CatchScope&&) = default;
ALWAYS_INLINE void clearException();
ALWAYS_INLINE bool clearExceptionExceptTermination();
};
#define DECLARE_CATCH_SCOPE(vm__) \
JSC::CatchScope((vm__))
#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
ALWAYS_INLINE void CatchScope::clearException()
{
m_vm.clearException();
}
ALWAYS_INLINE bool CatchScope::clearExceptionExceptTermination()
{
if (UNLIKELY(m_vm.hasPendingTerminationException())) {
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
m_vm.exception();
#endif
return false;
}
m_vm.clearException();
return true;
}
#define CLEAR_AND_RETURN_IF_EXCEPTION(scope__, value__) do { \
if (UNLIKELY((scope__).exception())) { \
(scope__).clearException(); \
return value__; \
} \
} while (false)
} // namespace JSC
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