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/*
* Copyright (C) 2011 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 "DFGOSRExit.h"
#if ENABLE(DFG_JIT)
#include "DFGAssemblyHelpers.h"
#include "DFGSpeculativeJIT.h"
#include "JSCellInlines.h"
namespace JSC { namespace DFG {
OSRExit::OSRExit(ExitKind kind, JSValueSource jsValueSource, MethodOfGettingAValueProfile valueProfile, SpeculativeJIT* jit, unsigned streamIndex, unsigned recoveryIndex)
: m_jsValueSource(jsValueSource)
, m_valueProfile(valueProfile)
, m_patchableCodeOffset(0)
, m_codeOrigin(jit->m_codeOriginForOSR)
, m_codeOriginForExitProfile(m_codeOrigin)
, m_recoveryIndex(recoveryIndex)
, m_watchpointIndex(std::numeric_limits<unsigned>::max())
, m_kind(kind)
, m_count(0)
, m_streamIndex(streamIndex)
, m_lastSetOperand(jit->m_lastSetOperand)
{
ASSERT(m_codeOrigin.isSet());
}
void OSRExit::setPatchableCodeOffset(MacroAssembler::PatchableJump check)
{
m_patchableCodeOffset = check.m_jump.m_label.m_offset;
}
MacroAssembler::Jump OSRExit::getPatchableCodeOffsetAsJump() const
{
return MacroAssembler::Jump(AssemblerLabel(m_patchableCodeOffset));
}
CodeLocationJump OSRExit::codeLocationForRepatch(CodeBlock* dfgCodeBlock) const
{
return CodeLocationJump(dfgCodeBlock->getJITCode().dataAddressAtOffset(m_patchableCodeOffset));
}
void OSRExit::correctJump(LinkBuffer& linkBuffer)
{
MacroAssembler::Label label;
label.m_label.m_offset = m_patchableCodeOffset;
m_patchableCodeOffset = linkBuffer.offsetOf(label);
}
bool OSRExit::considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock)
{
FrequentExitSite exitSite;
if (m_kind == ArgumentsEscaped) {
// Count this one globally. It doesn't matter where in the code block the arguments excaped;
// the fact that they did is not associated with any particular instruction.
exitSite = FrequentExitSite(m_kind);
} else
exitSite = FrequentExitSite(m_codeOriginForExitProfile.bytecodeIndex, m_kind);
return baselineCodeBlockForOriginAndBaselineCodeBlock(m_codeOriginForExitProfile, profiledCodeBlock)->addFrequentExitSite(exitSite);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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