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/*
* Copyright (C) 2012-2018 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.
*/
#pragma once
#include "CodeLocation.h"
#include <wtf/Forward.h>
namespace JSC {
enum class HandlerType : uint8_t {
Catch = 0,
Finally = 1,
SynthesizedCatch = 2,
SynthesizedFinally = 3
};
enum class RequiredHandler {
CatchHandler,
AnyHandler
};
struct HandlerInfoBase {
HandlerType type() const { return static_cast<HandlerType>(typeBits); }
void setType(HandlerType type) { typeBits = static_cast<uint32_t>(type); }
const char* typeName() const
{
switch (type()) {
case HandlerType::Catch:
return "catch";
case HandlerType::Finally:
return "finally";
case HandlerType::SynthesizedCatch:
return "synthesized catch";
case HandlerType::SynthesizedFinally:
return "synthesized finally";
default:
ASSERT_NOT_REACHED();
}
return nullptr;
}
bool isCatchHandler() const { return type() == HandlerType::Catch; }
template<typename Handler, typename Container>
static Handler* handlerForIndex(Container& exeptionHandlers, unsigned index, RequiredHandler requiredHandler)
{
for (auto& handler : exeptionHandlers) {
if ((requiredHandler == RequiredHandler::CatchHandler) && !handler.isCatchHandler())
continue;
// Handlers are ordered innermost first, so the first handler we encounter
// that contains the source address is the correct handler to use.
// This index used is either the BytecodeOffset or a CallSiteIndex.
if (handler.start <= index && handler.end > index)
return &handler;
}
return nullptr;
}
uint32_t start;
uint32_t end;
uint32_t target;
uint32_t typeBits : 2; // HandlerType
};
struct UnlinkedHandlerInfo : public HandlerInfoBase {
UnlinkedHandlerInfo()
{
}
UnlinkedHandlerInfo(uint32_t start, uint32_t end, uint32_t target, HandlerType handlerType)
{
this->start = start;
this->end = end;
this->target = target;
setType(handlerType);
ASSERT(type() == handlerType);
}
};
struct HandlerInfo : public HandlerInfoBase {
void initialize(const UnlinkedHandlerInfo& unlinkedInfo)
{
start = unlinkedInfo.start;
end = unlinkedInfo.end;
target = unlinkedInfo.target;
typeBits = unlinkedInfo.typeBits;
}
#if ENABLE(JIT)
void initialize(const UnlinkedHandlerInfo& unlinkedInfo, CodeLocationLabel<ExceptionHandlerPtrTag> label)
{
initialize(unlinkedInfo);
nativeCode = label;
}
CodeLocationLabel<ExceptionHandlerPtrTag> nativeCode;
#endif
};
} // namespace JSC
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