diff options
Diffstat (limited to 'Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp')
| -rw-r--r-- | Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp | 61 |
1 files changed, 60 insertions, 1 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp b/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp index a195ee3ba..a63f671bc 100644 --- a/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp +++ b/Source/JavaScriptCore/dfg/DFGOSRExitCompiler.cpp @@ -74,7 +74,8 @@ void compileOSRExit(ExecState* exec) { AssemblyHelpers jit(globalData, codeBlock); OSRExitCompiler exitCompiler(jit); - + + jit.jitAssertHasValidCallFrame(); exitCompiler.compileExit(exit, recovery); LinkBuffer patchBuffer(*globalData, &jit, codeBlock); @@ -95,6 +96,64 @@ void compileOSRExit(ExecState* exec) } // extern "C" +void OSRExitCompiler::handleExitCounts(const OSRExit& exit) +{ + m_jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count)); + + m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.codeBlock()), GPRInfo::regT0); + + AssemblyHelpers::JumpList tooFewFails; + + if (exit.m_kind == InadequateCoverage) { + // Proceed based on the assumption that we can profitably optimize this code once + // it has executed enough times. + + m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfForcedOSRExitCounter()), GPRInfo::regT2); + m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()), GPRInfo::regT1); + m_jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2); + m_jit.add32(AssemblyHelpers::TrustedImm32(-1), GPRInfo::regT1); + m_jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfForcedOSRExitCounter())); + m_jit.store32(GPRInfo::regT1, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter())); + + tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(Options::forcedOSRExitCountForReoptimization))); + } else { + // Proceed based on the assumption that we can handle these exits so long as they + // don't get too frequent. + + m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeFailCounter()), GPRInfo::regT2); + m_jit.load32(AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter()), GPRInfo::regT1); + m_jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2); + m_jit.add32(AssemblyHelpers::TrustedImm32(-1), GPRInfo::regT1); + m_jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeFailCounter())); + m_jit.store32(GPRInfo::regT1, AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfSpeculativeSuccessCounter())); + + m_jit.move(AssemblyHelpers::TrustedImmPtr(m_jit.baselineCodeBlock()), GPRInfo::regT0); + + tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(m_jit.codeBlock()->largeFailCountThreshold()))); + m_jit.mul32(AssemblyHelpers::TrustedImm32(Options::desiredSpeculativeSuccessFailRatio), GPRInfo::regT2, GPRInfo::regT2); + + tooFewFails.append(m_jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1)); + } + + // Reoptimize as soon as possible. + m_jit.store32(AssemblyHelpers::TrustedImm32(0), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter())); + m_jit.store32(AssemblyHelpers::TrustedImm32(0), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold())); + AssemblyHelpers::Jump doneAdjusting = m_jit.jump(); + + tooFewFails.link(&m_jit); + + // Adjust the execution counter such that the target is to only optimize after a while. + int32_t targetValue = + ExecutionCounter::applyMemoryUsageHeuristicsAndConvertToInt( + m_jit.baselineCodeBlock()->counterValueForOptimizeAfterLongWarmUp(), + m_jit.baselineCodeBlock()); + m_jit.store32(AssemblyHelpers::TrustedImm32(-targetValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter())); + m_jit.store32(AssemblyHelpers::TrustedImm32(targetValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold())); + m_jit.store32(AssemblyHelpers::TrustedImm32(ExecutionCounter::formattedTotalCount(targetValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount())); + + doneAdjusting.link(&m_jit); +} + } } // namespace JSC::DFG #endif // ENABLE(DFG_JIT) |