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DFGOSRExit.cpp
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86 lines (75 loc) · 3.62 KB
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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"
namespace JSC { namespace DFG {
static unsigned computeNumVariablesForCodeOrigin(
CodeBlock* codeBlock, const CodeOrigin& codeOrigin)
{
if (!codeOrigin.inlineCallFrame)
return codeBlock->m_numCalleeRegisters;
return
codeOrigin.inlineCallFrame->stackOffset +
baselineCodeBlockForInlineCallFrame(codeOrigin.inlineCallFrame)->m_numCalleeRegisters;
}
OSRExit::OSRExit(ExitKind kind, JSValueSource jsValueSource, MethodOfGettingAValueProfile valueProfile, MacroAssembler::Jump check, SpeculativeJIT* jit, unsigned recoveryIndex)
: m_jsValueSource(jsValueSource)
, m_valueProfile(valueProfile)
, m_check(check)
, m_nodeIndex(jit->m_compileIndex)
, m_codeOrigin(jit->m_codeOriginForOSR)
, m_codeOriginForExitProfile(m_codeOrigin)
, m_recoveryIndex(recoveryIndex)
, m_kind(kind)
, m_count(0)
, m_arguments(jit->m_arguments.size())
, m_variables(computeNumVariablesForCodeOrigin(jit->m_jit.graph().m_profiledBlock, jit->m_codeOriginForOSR))
, m_lastSetOperand(jit->m_lastSetOperand)
{
ASSERT(m_codeOrigin.isSet());
for (unsigned argument = 0; argument < m_arguments.size(); ++argument)
m_arguments[argument] = jit->computeValueRecoveryFor(jit->m_arguments[argument]);
for (unsigned variable = 0; variable < m_variables.size(); ++variable)
m_variables[variable] = jit->computeValueRecoveryFor(jit->m_variables[variable]);
}
void OSRExit::dump(FILE* out) const
{
for (unsigned argument = 0; argument < m_arguments.size(); ++argument)
m_arguments[argument].dump(out);
fprintf(out, " : ");
for (unsigned variable = 0; variable < m_variables.size(); ++variable)
m_variables[variable].dump(out);
}
bool OSRExit::considerAddingAsFrequentExitSiteSlow(CodeBlock* dfgCodeBlock, CodeBlock* profiledCodeBlock)
{
if (static_cast<double>(m_count) / dfgCodeBlock->speculativeFailCounter() <= Options::osrExitProminenceForFrequentExitSite)
return false;
return baselineCodeBlockForOriginAndBaselineCodeBlock(m_codeOriginForExitProfile, profiledCodeBlock)->addFrequentExitSite(FrequentExitSite(m_codeOriginForExitProfile.bytecodeIndex, m_kind));
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)