Changeset 99787 in webkit for trunk/Source/JavaScriptCore/runtime/JSGlobalData.h

Timestamp:

Nov 9, 2011, 5:08:50 PM (14 years ago)

Author:

[email protected]

Message:

DFG OSR exit code should be lazily generated
​https://bugs.webkit.org/show_bug.cgi?id=71744

Reviewed by Gavin Barraclough.

The OSR exit code is now generated the first time it is executed,
rather than right after speculative compilation. Because most OSR
exits are never taken, this should greatly reduce both code size
and compilation time.

This is a 1% win on SunSpider, and a 1% win on V8 when running in
my harness. No change in V8 in V8's harness (due to the long runs,
so compile time is not an issue) and no change in Kraken (again,
long runs of small code so compile time has no measurable effect).

• CMakeListsEfl.txt:
• GNUmakefile.list.am:
• JavaScriptCore.xcodeproj/project.pbxproj:
• Target.pri:
• assembler/AbstractMacroAssembler.h:
• assembler/MacroAssemblerX86.h:

(JSC::MacroAssemblerX86::jump):

• assembler/MacroAssemblerX86_64.h:

(JSC::MacroAssemblerX86_64::jump):

• assembler/X86Assembler.h:

(JSC::X86Assembler::jmp_m):

• bytecode/CodeBlock.h:

(JSC::CodeBlock::createDFGDataIfNecessary):
(JSC::CodeBlock::appendDFGOSREntryData):
(JSC::CodeBlock::numberOfDFGOSREntries):
(JSC::CodeBlock::dfgOSREntryData):
(JSC::CodeBlock::dfgOSREntryDataForBytecodeIndex):
(JSC::CodeBlock::appendOSRExit):
(JSC::CodeBlock::appendSpeculationRecovery):
(JSC::CodeBlock::numberOfOSRExits):
(JSC::CodeBlock::numberOfSpeculationRecoveries):
(JSC::CodeBlock::osrExit):
(JSC::CodeBlock::speculationRecovery):

• dfg/DFGAssemblyHelpers.h:

(JSC::DFG::AssemblyHelpers::debugCall):

• dfg/DFGCorrectableJumpPoint.cpp: Added.

(JSC::DFG::CorrectableJumpPoint::codeLocationForRepatch):

• dfg/DFGCorrectableJumpPoint.h: Added.

(JSC::DFG::CorrectableJumpPoint::CorrectableJumpPoint):
(JSC::DFG::CorrectableJumpPoint::switchToLateJump):
(JSC::DFG::CorrectableJumpPoint::correctInitialJump):
(JSC::DFG::CorrectableJumpPoint::correctLateJump):
(JSC::DFG::CorrectableJumpPoint::initialJump):
(JSC::DFG::CorrectableJumpPoint::lateJump):
(JSC::DFG::CorrectableJumpPoint::correctJump):
(JSC::DFG::CorrectableJumpPoint::getJump):

• dfg/DFGJITCompiler.cpp:

(JSC::DFG::JITCompiler::linkOSRExits):
(JSC::DFG::JITCompiler::compileBody):
(JSC::DFG::JITCompiler::link):

• dfg/DFGJITCompiler.h:
• dfg/DFGOSRExit.cpp: Added.

(JSC::DFG::OSRExit::OSRExit):
(JSC::DFG::OSRExit::dump):

• dfg/DFGOSRExit.h:
• dfg/DFGOSRExitCompiler.cpp: Added.
• dfg/DFGOSRExitCompiler.h:
• dfg/DFGOSRExitCompiler32_64.cpp:

(JSC::DFG::OSRExitCompiler::compileExit):

• dfg/DFGOSRExitCompiler64.cpp:

(JSC::DFG::OSRExitCompiler::compileExit):

• dfg/DFGOperations.cpp:
• dfg/DFGSpeculativeJIT.cpp:
• dfg/DFGSpeculativeJIT.h:

(JSC::DFG::SpeculativeJIT::speculationCheck):

• dfg/DFGThunks.cpp: Added.

(JSC::DFG::osrExitGenerationThunkGenerator):

• dfg/DFGThunks.h: Added.
• jit/JITCode.h:

(JSC::JITCode::dataAddressAtOffset):

• runtime/JSGlobalData.h:

File:

• trunk/Source/JavaScriptCore/runtime/JSGlobalData.h (modified) (1 diff)

trunk/Source/JavaScriptCore/runtime/JSGlobalData.h

@@ -241 +241 @@
         ReturnAddressPtr exceptionLocation;
         JSValue hostCallReturnValue;
-#ifndef NDEBUG
-        int64_t debugDataBuffer[64];
-#endif
 #if ENABLE(DFG_JIT)
+        uint32_t osrExitIndex;
+        void* osrExitJumpDestination;
         Vector<void*> scratchBuffers;
         size_t sizeOfLastScratchBuffer;