FTL should be able to do simple OSR exits using llvm.webkit.stackmap
https://bugs.webkit.org/show_bug.cgi?id=122538

Reviewed by Oliver Hunt.

* wtf/PrintStream.cpp:
(WTF::printInternal):
* wtf/PrintStream.h:
* wtf/RefCountedArray.h:
(WTF::RefCountedArray::byteSize):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157208 268f45cc-cd09-0410-ab3c-d52691b4dbfc
FTL should be able to do simple OSR exits using llvm.webkit.stackmap
https://bugs.webkit.org/show_bug.cgi?id=122538

Reviewed by Oliver Hunt.
        
This gives the FTL the ability to OSR exit using the llvm.webkit.stackmap intrinsic.
        
- The FTL compiles all OSR exit calls as calls to llvm.webkit.stackmap with a unique
  ID, passing a requested size that is big enough for own jump replacement.
        
- After LLVM compilation, we parse the new LLVM stackmap section.
        
- For all llvm.webkit.stackmaps that we used for OSR exits, we do a jumpReplacement,
  which targets exit thunks that we generate.
        
- If an exit thunk fires, it causes JSC to compile an exit off-ramp that uses a
  combination of the JSC-internal OSR exit accounting (FTL::ExitValue and friends) and
  LLVM stackmap's accounting of where data actually ended up (register, indirect,
  constant) to reconstruct bytecode state.
        
This still has shortcomings; for example it cannot handle XMM or YMM registers. Handling
YMM registers will require adding some basic YMM support to our assemblers - really we
just need the ability to move a YMM's value into a GPR.
        
This patch preserves all of the old, intrinsic-less, FTL OSR exit support. Hence it
manages to pass all existing FTL tests even despite its incompleteness. I think that's
the right way to go since this is already a big patch, and anyway it would be great to
keep the intrinsic-less FTL OSR exit support so long as the LLVM side of this hasn't
landed.

* JavaScriptCore.xcodeproj/project.pbxproj:
* assembler/AbstractMacroAssembler.h:
(JSC::AbstractMacroAssembler::firstRegister):
(JSC::AbstractMacroAssembler::lastRegister):
* assembler/MacroAssembler.h:
(JSC::MacroAssembler::isStackRelated):
(JSC::MacroAssembler::firstRealRegister):
(JSC::MacroAssembler::nextRegister):
(JSC::MacroAssembler::secondRealRegister):
* assembler/MacroAssemblerX86Common.h:
* assembler/X86Assembler.h:
(JSC::X86Assembler::firstRegister):
(JSC::X86Assembler::lastRegister):
* dfg/DFGPlan.cpp:
(JSC::DFG::Plan::compileInThreadImpl):
* ftl/FTLCArgumentGetter.cpp:
(JSC::FTL::CArgumentGetter::loadNextAndBox):
* ftl/FTLCArgumentGetter.h:
(JSC::FTL::CArgumentGetter::loadNextDoubleIntoGPR):
* ftl/FTLCompile.cpp:
(JSC::FTL::mmAllocateCodeSection):
(JSC::FTL::mmAllocateDataSection):
(JSC::FTL::dumpDataSection):
(JSC::FTL::fixFunctionBasedOnStackMaps):
(JSC::FTL::compile):
* ftl/FTLExitThunkGenerator.cpp:
(JSC::FTL::ExitThunkGenerator::emitThunk):
(JSC::FTL::ExitThunkGenerator::emitThunks):
* ftl/FTLExitThunkGenerator.h:
* ftl/FTLExitValue.h:
(JSC::FTL::ExitValue::isInJSStackSomehow):
(JSC::FTL::ExitValue::valueFormat):
* ftl/FTLFail.cpp:
(JSC::FTL::fail):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLJITCode.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::generateExitThunks):
(JSC::FTL::LowerDFGToLLVM::LowerDFGToLLVM):
(JSC::FTL::LowerDFGToLLVM::appendOSRExit):
(JSC::FTL::LowerDFGToLLVM::emitOSRExitCall):
(JSC::FTL::LowerDFGToLLVM::linkOSRExitsAndCompleteInitializationBlocks):
* ftl/FTLOSRExit.h:
* ftl/FTLOSRExitCompilationInfo.h:
(JSC::FTL::OSRExitCompilationInfo::OSRExitCompilationInfo):
* ftl/FTLOSRExitCompiler.cpp:
(JSC::FTL::compileStubWithOSRExitStackmap):
(JSC::FTL::compileStubWithoutOSRExitStackmap):
(JSC::FTL::compileFTLOSRExit):
* ftl/FTLSaveRestore.cpp: Added.
(JSC::FTL::bytesForGPRs):
(JSC::FTL::requiredScratchMemorySizeInBytes):
(JSC::FTL::offsetOfGPR):
(JSC::FTL::saveAllRegisters):
(JSC::FTL::restoreAllRegisters):
* ftl/FTLSaveRestore.h: Added.
* ftl/FTLStackMaps.cpp: Added.
(JSC::FTL::readObject):
(JSC::FTL::StackMaps::Constant::parse):
(JSC::FTL::StackMaps::Constant::dump):
(JSC::FTL::StackMaps::Location::parse):
(JSC::FTL::StackMaps::Location::dump):
(JSC::FTL::StackMaps::Location::involvesGPR):
(JSC::FTL::StackMaps::Location::isGPR):
(JSC::FTL::StackMaps::Location::gpr):
(JSC::FTL::StackMaps::Location::restoreInto):
(JSC::FTL::StackMaps::Record::parse):
(JSC::FTL::StackMaps::Record::dump):
(JSC::FTL::StackMaps::parse):
(JSC::FTL::StackMaps::dump):
(JSC::FTL::StackMaps::dumpMultiline):
(JSC::FTL::StackMaps::getRecordMap):
(WTF::printInternal):
* ftl/FTLStackMaps.h: Added.
* ftl/FTLState.h:
* ftl/FTLThunks.cpp:
(JSC::FTL::osrExitGenerationThunkGenerator):
* ftl/FTLValueFormat.cpp:
(JSC::FTL::reboxAccordingToFormat):
* ftl/FTLValueFormat.h:
* runtime/DataView.cpp:
(JSC::DataView::create):
* runtime/DataView.h:
(JSC::DataView::read):
* runtime/Options.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157209 268f45cc-cd09-0410-ab3c-d52691b4dbfc