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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.
*/
#include "config.h"
#include "WasmHandlerInfo.h"
#if ENABLE(WEBASSEMBLY)
#include "JSWebAssemblyInstance.h"
#include "WasmTag.h"
namespace JSC {
namespace Wasm {
void HandlerInfo::initialize(const UnlinkedHandlerInfo& unlinkedInfo, CodePtr<ExceptionHandlerPtrTag> label)
{
m_type = unlinkedInfo.m_type;
m_start = unlinkedInfo.m_start;
m_end = unlinkedInfo.m_end;
m_target = unlinkedInfo.m_target;
m_targetMetadata = unlinkedInfo.m_targetMetadata;
m_tryDepth = unlinkedInfo.m_tryDepth;
m_nativeCode = label;
switch (m_type) {
case HandlerType::Catch:
case HandlerType::TryTableCatch:
case HandlerType::TryTableCatchRef:
m_tag = unlinkedInfo.m_exceptionIndexOrDelegateTarget;
break;
case HandlerType::CatchAll:
case HandlerType::TryTableCatchAll:
case HandlerType::TryTableCatchAllRef:
break;
case HandlerType::Delegate:
m_delegateTarget = unlinkedInfo.m_exceptionIndexOrDelegateTarget;
break;
}
}
const HandlerInfo* HandlerInfo::handlerForIndex(JSWebAssemblyInstance& instance, const FixedVector<HandlerInfo>& exceptionHandlers, unsigned index, const Wasm::Tag* exceptionTag)
{
bool delegating = false;
unsigned delegateTarget = 0;
for (auto& handler : exceptionHandlers) {
// 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.m_start <= index && handler.m_end > index) {
if (delegating) {
if (handler.m_tryDepth != delegateTarget)
continue;
delegating = false;
}
bool match = false;
switch (handler.m_type) {
case HandlerType::Catch:
case HandlerType::TryTableCatch:
case HandlerType::TryTableCatchRef:
match = exceptionTag && instance.tag(handler.m_tag) == *exceptionTag;
break;
case HandlerType::CatchAll:
case HandlerType::TryTableCatchAll:
case HandlerType::TryTableCatchAllRef:
match = true;
break;
case HandlerType::Delegate:
delegating = true;
delegateTarget = handler.m_delegateTarget;
break;
}
if (!match)
continue;
return &handler;
}
}
return nullptr;
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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