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/*
* Copyright (C) 2021-2024 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
#if ENABLE(WEBASSEMBLY)
#include "CodeLocation.h"
#include <wtf/Forward.h>
#include <wtf/text/ASCIILiteral.h>
namespace JSC {
class JSWebAssemblyInstance;
namespace Wasm {
class Tag;
enum class HandlerType {
Catch = 0,
CatchAll = 1,
Delegate = 2,
TryTableCatch = 3,
TryTableCatchRef = 4,
TryTableCatchAll = 5,
TryTableCatchAllRef = 6,
};
struct HandlerInfoBase {
HandlerType m_type;
uint32_t m_start;
uint32_t m_end;
uint32_t m_target;
uint32_t m_targetMetadata { 0 };
uint32_t m_tryDepth;
uint32_t m_exceptionIndexOrDelegateTarget;
};
struct UnlinkedHandlerInfo : public HandlerInfoBase {
UnlinkedHandlerInfo()
{
}
UnlinkedHandlerInfo(HandlerType handlerType, uint32_t start, uint32_t end, uint32_t target, uint32_t tryDepth, uint32_t exceptionIndexOrDelegateTarget)
{
m_type = handlerType;
m_start = start;
m_end = end;
m_target = target;
m_tryDepth = tryDepth;
m_exceptionIndexOrDelegateTarget = exceptionIndexOrDelegateTarget;
}
UnlinkedHandlerInfo(HandlerType handlerType, uint32_t start, uint32_t end, uint32_t target, uint32_t targetMetadata, uint32_t tryDepth, uint32_t exceptionIndexOrDelegateTarget)
{
m_type = handlerType;
m_start = start;
m_end = end;
m_target = target;
m_targetMetadata = targetMetadata;
m_tryDepth = tryDepth;
m_exceptionIndexOrDelegateTarget = exceptionIndexOrDelegateTarget;
}
ASCIILiteral typeName() const
{
switch (m_type) {
case HandlerType::Catch:
return "catch"_s;
case HandlerType::CatchAll:
return "catchall"_s;
case HandlerType::Delegate:
return "delegate"_s;
case HandlerType::TryTableCatch:
return "try_table catch"_s;
case HandlerType::TryTableCatchRef:
return "try_table catch_ref"_s;
case HandlerType::TryTableCatchAll:
return "try_table catch_all"_s;
case HandlerType::TryTableCatchAllRef:
return "try_table catch_all_ref"_s;
default:
ASSERT_NOT_REACHED();
break;
}
return { };
}
};
struct HandlerInfo : public HandlerInfoBase {
static const HandlerInfo* handlerForIndex(JSWebAssemblyInstance&, const FixedVector<HandlerInfo>& exeptionHandlers, unsigned index, const Wasm::Tag* exceptionTag);
void initialize(const UnlinkedHandlerInfo&, CodePtr<ExceptionHandlerPtrTag>);
unsigned tag() const
{
ASSERT(m_type == HandlerType::Catch);
return m_tag;
}
unsigned delegateTarget() const
{
ASSERT(m_type == HandlerType::Delegate);
return m_delegateTarget;
}
CodePtr<ExceptionHandlerPtrTag> m_nativeCode;
private:
union {
unsigned m_tag;
unsigned m_delegateTarget;
};
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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