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BaselineJITPlan.cpp
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BaselineJITPlan.cpp
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/*
* Copyright (C) 2021 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
"
BaselineJITPlan.h
"
#
include
"
LOLJIT.h
"
#
include
"
JITSafepoint.h
"
#
if
ENABLE(JIT)
namespace
JSC
{
BaselineJITPlan::BaselineJITPlan
(CodeBlock* codeBlock)
: JITPlan(JITCompilationMode::Baseline, codeBlock)
{
JIT::doMainThreadPreparationBeforeCompile
(codeBlock->
vm
());
}
auto
BaselineJITPlan::compileInThreadImpl
(JITCompilationEffort effort) -> CompilationPath
{
{
ConcurrentJSLocker
locker
(m_codeBlock->
valueProfileLock
());
m_codeBlock->
updateAllNonLazyValueProfilePredictions
(locker);
m_codeBlock->
updateAllLazyValueProfilePredictions
(locker);
}
//
BaselineJITPlan can keep underlying CodeBlock alive while running.
//
So we do not need to suspend this compilation thread while running GC.
Safepoint::Result result;
{
Safepoint
safepoint
(*
this
, result);
safepoint.
begin
(
false
);
if
(
Options::useLOLJIT
()) {
LOL
::
LOLJIT
jit
(*m_vm, *
this
, m_codeBlock);
auto
jitCode = jit.
compileAndLinkWithoutFinalizing
(effort);
m_jitCode =
WTF::move
(jitCode);
}
else
{
JIT
jit
(*m_vm, *
this
, m_codeBlock);
auto
jitCode = jit.
compileAndLinkWithoutFinalizing
(effort);
m_jitCode =
WTF::move
(jitCode);
}
}
if
(result.
didGetCancelled
())
return
CancelPath;
return
BaselinePath;
}
auto
BaselineJITPlan::compileInThreadImpl
() -> CompilationPath
{
return
compileInThreadImpl
(JITCompilationCanFail);
}
auto
BaselineJITPlan::compileSync
(JITCompilationEffort effort) -> CompilationPath
{
return
compileInThreadImpl
(effort);
}
size_t
BaselineJITPlan::codeSize
()
const
{
if
(m_jitCode)
return
m_jitCode->
size
();
return
0
;
}
bool
BaselineJITPlan::isKnownToBeLiveAfterGC
()
{
//
If stage is not JITPlanStage::Canceled, we should keep this alive and mark underlying CodeBlock anyway.
//
Regardless of whether the owner ScriptExecutable / CodeBlock dies, compiled code would be still usable
//
since Baseline JIT is *unlinked*. So, let's not stop compilation.
return
m_stage != JITPlanStage::Canceled;
}
bool
BaselineJITPlan::isKnownToBeLiveDuringGC
(AbstractSlotVisitor&)
{
//
Ditto to isKnownToBeLiveAfterGC. Unless plan gets completely cancelled before running, we should keep compilation running.
return
m_stage != JITPlanStage::Canceled;
}
CompilationResult
BaselineJITPlan::finalize
()
{
CompilationResult result =
JIT::finalizeOnMainThread
(m_codeBlock, *
this
, m_jitCode);
switch
(result) {
case
CompilationResult::CompilationFailed:
CODEBLOCK_LOG_EVENT
(m_codeBlock,
"
delayJITCompile
"
, (
"
compilation failed
"
));
dataLogLnIf
(
Options::verboseOSR
(),
"
JIT compilation failed.
"
);
m_codeBlock->
dontJITAnytimeSoon
();
m_codeBlock->
m_didFailJITCompilation
=
true
;
break
;
case
CompilationResult::CompilationSuccessful:
WTF::crossModifyingCodeFence
();
dataLogLnIf
(
Options::verboseOSR
(),
"
JIT compilation successful.
"
);
m_codeBlock->
ownerExecutable
()->
installCode
(m_codeBlock);
m_codeBlock->
jitSoon
();
break
;
default
:
RELEASE_ASSERT_NOT_REACHED
();
break
;
}
return
result;
}
}
//
namespace JSC
#
endif
//
ENABLE(JIT)
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