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/*
* Copyright (C) 2016-2018 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.
*/
#include "config.h"
#include "FTLPatchpointExceptionHandle.h"
#if ENABLE(FTL_JIT)
#include "B3StackmapGenerationParams.h"
#include "FTLExceptionTarget.h"
#include "FTLOSRExit.h"
#include "FTLOSRExitHandle.h"
#include "FTLState.h"
namespace JSC { namespace FTL {
using namespace DFG;
Ref<PatchpointExceptionHandle> PatchpointExceptionHandle::create(
State& state, OSRExitDescriptor* descriptor, NodeOrigin origin, unsigned dfgNodeIndex, unsigned offset,
const HandlerInfo& handler)
{
return adoptRef(*new PatchpointExceptionHandle(state, descriptor, origin, dfgNodeIndex, offset, handler));
}
RefPtr<PatchpointExceptionHandle> PatchpointExceptionHandle::defaultHandle(State& state, unsigned dfgNodeIndex)
{
if (!state.defaultExceptionHandle) {
state.defaultExceptionHandle = adoptRef(
new PatchpointExceptionHandle(state, nullptr, NodeOrigin(), dfgNodeIndex, 0, HandlerInfo()));
}
return state.defaultExceptionHandle;
}
PatchpointExceptionHandle::~PatchpointExceptionHandle() = default;
RefPtr<ExceptionTarget> PatchpointExceptionHandle::scheduleExitCreation(
const B3::StackmapGenerationParams& params)
{
if (!m_descriptor) {
// NOTE: This object could be a singleton, however usually we toss the ExceptionHandler
// object shortly after creation.
bool isDefaultHandler = true;
return adoptRef(
new ExceptionTarget(isDefaultHandler, m_state.exceptionHandler, nullptr));
}
bool isDefaultHandler = false;
return adoptRef(new ExceptionTarget(isDefaultHandler, { }, createHandle(ExceptionCheck, params)));
}
void PatchpointExceptionHandle::scheduleExitCreationForUnwind(
const B3::StackmapGenerationParams& params, CallSiteIndex callSiteIndex)
{
if (!m_descriptor)
return;
RefPtr<OSRExitHandle> handle = createHandle(GenericUnwind, params);
handle->m_jitCode->m_osrExit[handle->m_index].m_exceptionHandlerCallSiteIndex = callSiteIndex;
HandlerInfo handler = m_handler;
auto* plan = &m_state.graph.m_plan;
params.addLatePath(
[handle, handler, callSiteIndex, plan] (CCallHelpers& jit) {
CodeBlock* codeBlock = jit.codeBlock();
jit.addLinkTask([=] (LinkBuffer& linkBuffer) {
HandlerInfo newHandler = handler;
newHandler.start = callSiteIndex.bits();
newHandler.end = callSiteIndex.bits() + 1;
newHandler.nativeCode = linkBuffer.locationOf<ExceptionHandlerPtrTag>(handle->label);
plan->addMainThreadFinalizationTask([=] {
codeBlock->appendExceptionHandler(newHandler);
});
});
});
}
PatchpointExceptionHandle::PatchpointExceptionHandle(
State& state, OSRExitDescriptor* descriptor, NodeOrigin origin, unsigned dfgNodeIndex, unsigned offset,
const HandlerInfo& handler)
: m_state(state)
, m_descriptor(descriptor)
, m_origin(origin)
, m_dfgNodeIndex(dfgNodeIndex)
, m_offset(offset)
, m_handler(handler)
{
}
Ref<OSRExitHandle> PatchpointExceptionHandle::createHandle(
ExitKind kind, const B3::StackmapGenerationParams& params)
{
return m_descriptor->emitOSRExitLater(
m_state, kind, m_origin, params, m_dfgNodeIndex, m_offset);
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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