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/*
* Copyright (C) 2013-2022 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.
*/
#include "config.h"
#include "FTLJITCode.h"
#if ENABLE(FTL_JIT)
#include "FTLState.h"
#include "JSCPtrTag.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC { namespace FTL {
using namespace B3;
JITCode::JITCode()
: JSC::JITCode(JITType::FTLJIT)
, common(/* isUnlinked */ false)
{
}
JITCode::~JITCode()
{
if (FTL::shouldDumpDisassembly()) {
if (m_b3Code)
dataLogLn("Destroying FTL JIT code at ", m_b3Code);
}
}
void JITCode::initializeB3Code(CodeRef<JSEntryPtrTag> b3Code)
{
m_b3Code = b3Code;
}
void JITCode::initializeB3Byproducts(std::unique_ptr<OpaqueByproducts> byproducts)
{
m_b3Byproducts = WTFMove(byproducts);
}
void JITCode::initializeAddressForCall(CodePtr<JSEntryPtrTag> address)
{
m_addressForCall = address;
}
void JITCode::initializeAddressForArityCheck(CodePtr<JSEntryPtrTag> entrypoint)
{
m_addressForArityCheck = entrypoint;
}
CodePtr<JSEntryPtrTag> JITCode::addressForCall(ArityCheckMode arityCheck)
{
switch (arityCheck) {
case ArityCheckNotRequired:
return m_addressForCall;
case MustCheckArity:
return m_addressForArityCheck;
}
RELEASE_ASSERT_NOT_REACHED();
return CodePtr<JSEntryPtrTag>();
}
void* JITCode::executableAddressAtOffset(size_t offset)
{
if (!offset)
return m_addressForCall.taggedPtr();
char* executableAddress = m_addressForCall.untaggedPtr<char*>();
return tagCodePtr<JSEntryPtrTag>(executableAddress + offset);
}
void* JITCode::dataAddressAtOffset(size_t)
{
// We can't patch FTL code, yet. Even if we did, it's not clear that we would do so
// through this API.
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
unsigned JITCode::offsetOf(void*)
{
// We currently don't have visibility into the FTL code.
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
size_t JITCode::size()
{
// We don't know the size of FTL code, yet. Make a wild guess. This is mostly used for
// GC load estimates.
return m_size;
}
bool JITCode::contains(void*)
{
// We have no idea what addresses the FTL code contains, yet.
RELEASE_ASSERT_NOT_REACHED();
return false;
}
JITCode* JITCode::ftl()
{
return this;
}
DFG::CommonData* JITCode::dfgCommon()
{
return &common;
}
const DFG::CommonData* JITCode::dfgCommon() const
{
return &common;
}
void JITCode::shrinkToFit()
{
common.shrinkToFit();
m_osrExit.shrinkToFit();
osrExitDescriptors.shrinkToFit();
lazySlowPaths.shrinkToFit();
}
void JITCode::validateReferences(const TrackedReferences& trackedReferences)
{
common.validateReferences(trackedReferences);
for (OSRExit& exit : m_osrExit)
exit.m_descriptor->validateReferences(trackedReferences);
}
RegisterSetBuilder JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite(CodeBlock*, CallSiteIndex callSiteIndex)
{
for (OSRExit& exit : m_osrExit) {
if (exit.m_exceptionHandlerCallSiteIndex.bits() == callSiteIndex.bits()) {
RELEASE_ASSERT(exit.isExceptionHandler());
RELEASE_ASSERT(exit.isGenericUnwindHandler());
return ValueRep::usedRegisters(/* isSIMDContext = */ false, exit.m_valueReps);
}
}
return { };
}
std::optional<CodeOrigin> JITCode::findPC(CodeBlock* codeBlock, void* pc)
{
for (OSRExit& exit : m_osrExit) {
if (ExecutableMemoryHandle* handle = exit.m_code.executableMemory()) {
if (handle->start().untaggedPtr() <= pc && pc < handle->end().untaggedPtr())
return std::optional<CodeOrigin>(exit.m_codeOriginForExitProfile);
}
}
for (std::unique_ptr<LazySlowPath>& lazySlowPath : lazySlowPaths) {
if (ExecutableMemoryHandle* handle = lazySlowPath->stub().executableMemory()) {
if (handle->start().untaggedPtr() <= pc && pc < handle->end().untaggedPtr())
return std::optional<CodeOrigin>(codeBlock->codeOrigin(lazySlowPath->callSiteIndex()));
}
}
return std::nullopt;
}
} } // namespace JSC::FTL
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(FTL_JIT)
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