Ignore:
Timestamp:
Oct 9, 2012, 4:39:53 PM (13 years ago)
Author:
[email protected]
Message:

JSC should infer when indexed storage is contiguous, and optimize for it
​https://bugs.webkit.org/show_bug.cgi?id=97288

Reviewed by Mark Hahnenberg.

Source/JavaScriptCore:

This introduces a new kind of indexed property storage called Contiguous,
which has the following properties:

  • No header bits beyond IndexedHeader. This results in a 16 byte reduction in memory usage per array versus an ArrayStorage array. It also means that the total memory usage for an empty array is now just 3 * 8 on both 32-bit and 64-bit. Of that, only 8 bytes are array-specific; the rest is our standard object header overhead.


  • No need for hole checks on store. This results in a ~4% speed-up on Kraken and a ~1% speed-up on V8v7.


  • publicLength <= vectorLength. This means that doing new Array(blah) immediately allocates room for blah elements.


  • No sparse map or index bias.


If you ever do things to an array that would require publicLength >
vectorLength, a sparse map, or index bias, then we switch to ArrayStorage
mode. This seems to never happen in any benchmark we track, and is unlikely
to happen very frequently on any website.

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

(JSC::AbstractMacroAssembler::JumpList::append):

  • assembler/MacroAssembler.h:

(MacroAssembler):
(JSC::MacroAssembler::patchableBranchTest32):

  • bytecode/ByValInfo.h: Added.

(JSC):
(JSC::isOptimizableIndexingType):
(JSC::jitArrayModeForIndexingType):
(JSC::ByValInfo::ByValInfo):
(ByValInfo):
(JSC::getByValInfoBytecodeIndex):

  • bytecode/CodeBlock.h:

(CodeBlock):
(JSC::CodeBlock::getByValInfo):
(JSC::CodeBlock::setNumberOfByValInfos):
(JSC::CodeBlock::numberOfByValInfos):
(JSC::CodeBlock::byValInfo):

  • bytecode/SamplingTool.h:
  • dfg/DFGAbstractState.cpp:

(JSC::DFG::AbstractState::execute):

  • dfg/DFGArrayMode.cpp:

(JSC::DFG::fromObserved):
(JSC::DFG::modeAlreadyChecked):
(JSC::DFG::modeToString):

  • dfg/DFGArrayMode.h:

(DFG):
(JSC::DFG::modeUsesButterfly):
(JSC::DFG::modeIsJSArray):
(JSC::DFG::isInBoundsAccess):
(JSC::DFG::mayStoreToTail):
(JSC::DFG::mayStoreToHole):
(JSC::DFG::modeIsPolymorphic):
(JSC::DFG::polymorphicIncludesContiguous):
(JSC::DFG::polymorphicIncludesArrayStorage):
(JSC::DFG::canCSEStorage):
(JSC::DFG::modeSupportsLength):
(JSC::DFG::benefitsFromStructureCheck):
(JSC::DFG::isEffectful):

  • dfg/DFGByteCodeParser.cpp:

(JSC::DFG::ByteCodeParser::handleIntrinsic):

  • dfg/DFGCSEPhase.cpp:

(JSC::DFG::CSEPhase::getArrayLengthElimination):
(JSC::DFG::CSEPhase::getByValLoadElimination):
(JSC::DFG::CSEPhase::performNodeCSE):

  • dfg/DFGFixupPhase.cpp:

(JSC::DFG::FixupPhase::fixupNode):
(JSC::DFG::FixupPhase::checkArray):
(JSC::DFG::FixupPhase::blessArrayOperation):

  • dfg/DFGGraph.h:

(JSC::DFG::Graph::byValIsPure):

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

(JSC::DFG::tryCacheGetByID):

  • dfg/DFGSpeculativeJIT.cpp:

(JSC::DFG::SpeculativeJIT::checkArray):
(JSC::DFG::SpeculativeJIT::arrayify):
(JSC::DFG::SpeculativeJIT::compileGetArrayLength):
(JSC::DFG::SpeculativeJIT::temporaryRegisterForPutByVal):
(DFG):

  • dfg/DFGSpeculativeJIT.h:

(DFG):
(JSC::DFG::SpeculativeJIT::callOperation):
(SpeculativeJIT):
(JSC::DFG::SpeculativeJIT::putByValWillNeedExtraRegister):
(JSC::DFG::SpeculativeJIT::temporaryRegisterForPutByVal):

  • dfg/DFGSpeculativeJIT32_64.cpp:

(JSC::DFG::SpeculativeJIT::compileContiguousGetByVal):
(DFG):
(JSC::DFG::SpeculativeJIT::compileArrayStorageGetByVal):
(JSC::DFG::SpeculativeJIT::compileContiguousPutByVal):
(JSC::DFG::SpeculativeJIT::compileArrayStoragePutByVal):
(JSC::DFG::SpeculativeJIT::compile):

  • dfg/DFGSpeculativeJIT64.cpp:

(JSC::DFG::SpeculativeJIT::compileContiguousGetByVal):
(DFG):
(JSC::DFG::SpeculativeJIT::compileArrayStorageGetByVal):
(JSC::DFG::SpeculativeJIT::compileContiguousPutByVal):
(JSC::DFG::SpeculativeJIT::compileArrayStoragePutByVal):
(JSC::DFG::SpeculativeJIT::compile):

  • interpreter/Interpreter.cpp:

(SamplingScope):
(JSC::SamplingScope::SamplingScope):
(JSC::SamplingScope::~SamplingScope):
(JSC):
(JSC::Interpreter::execute):

  • jit/JIT.cpp:

(JSC::JIT::privateCompileSlowCases):
(JSC::JIT::privateCompile):

  • jit/JIT.h:

(JSC::ByValCompilationInfo::ByValCompilationInfo):
(ByValCompilationInfo):
(JSC):
(JIT):
(JSC::JIT::compileGetByVal):
(JSC::JIT::compilePutByVal):

  • jit/JITInlineMethods.h:

(JSC::JIT::emitAllocateJSArray):
(JSC::JIT::emitArrayProfileStoreToHoleSpecialCase):
(JSC):
(JSC::arrayProfileSaw):
(JSC::JIT::chooseArrayMode):

  • jit/JITOpcodes.cpp:

(JSC::JIT::emitSlow_op_get_argument_by_val):
(JSC::JIT::emit_op_new_array):
(JSC::JIT::emitSlow_op_new_array):

  • jit/JITOpcodes32_64.cpp:

(JSC::JIT::emitSlow_op_get_argument_by_val):

  • jit/JITPropertyAccess.cpp:

(JSC::JIT::emit_op_get_by_val):
(JSC):
(JSC::JIT::emitContiguousGetByVal):
(JSC::JIT::emitArrayStorageGetByVal):
(JSC::JIT::emitSlow_op_get_by_val):
(JSC::JIT::emit_op_put_by_val):
(JSC::JIT::emitContiguousPutByVal):
(JSC::JIT::emitArrayStoragePutByVal):
(JSC::JIT::emitSlow_op_put_by_val):
(JSC::JIT::privateCompilePatchGetArrayLength):
(JSC::JIT::privateCompileGetByVal):
(JSC::JIT::privateCompilePutByVal):

  • jit/JITPropertyAccess32_64.cpp:

(JSC::JIT::emit_op_get_by_val):
(JSC):
(JSC::JIT::emitContiguousGetByVal):
(JSC::JIT::emitArrayStorageGetByVal):
(JSC::JIT::emitSlow_op_get_by_val):
(JSC::JIT::emit_op_put_by_val):
(JSC::JIT::emitContiguousPutByVal):
(JSC::JIT::emitArrayStoragePutByVal):
(JSC::JIT::emitSlow_op_put_by_val):

  • jit/JITStubs.cpp:

(JSC::getByVal):
(JSC):
(JSC::DEFINE_STUB_FUNCTION):
(JSC::putByVal):

  • jit/JITStubs.h:
  • llint/LowLevelInterpreter.asm:
  • llint/LowLevelInterpreter32_64.asm:
  • llint/LowLevelInterpreter64.asm:
  • runtime/ArrayConventions.h:

(JSC::isDenseEnoughForVector):

  • runtime/ArrayPrototype.cpp:

(JSC):
(JSC::shift):
(JSC::unshift):
(JSC::arrayProtoFuncPush):
(JSC::arrayProtoFuncShift):
(JSC::arrayProtoFuncSplice):
(JSC::arrayProtoFuncUnShift):

  • runtime/Butterfly.h:

(Butterfly):
(JSC::Butterfly::fromPointer):
(JSC::Butterfly::pointer):
(JSC::Butterfly::publicLength):
(JSC::Butterfly::vectorLength):
(JSC::Butterfly::setPublicLength):
(JSC::Butterfly::setVectorLength):
(JSC::Butterfly::contiguous):
(JSC::Butterfly::fromContiguous):

  • runtime/ButterflyInlineMethods.h:

(JSC::Butterfly::unshift):
(JSC::Butterfly::shift):

  • runtime/IndexingHeaderInlineMethods.h:

(JSC::IndexingHeader::indexingPayloadSizeInBytes):

  • runtime/IndexingType.cpp: Added.

(JSC):
(JSC::indexingTypeToString):

  • runtime/IndexingType.h:

(JSC):
(JSC::hasContiguous):

  • runtime/JSArray.cpp:

(JSC::JSArray::setLengthWithArrayStorage):
(JSC::JSArray::setLength):
(JSC):
(JSC::JSArray::pop):
(JSC::JSArray::push):
(JSC::JSArray::shiftCountWithArrayStorage):
(JSC::JSArray::shiftCountWithAnyIndexingType):
(JSC::JSArray::unshiftCountWithArrayStorage):
(JSC::JSArray::unshiftCountWithAnyIndexingType):
(JSC::JSArray::sortNumericVector):
(JSC::JSArray::sortNumeric):
(JSC::JSArray::sortCompactedVector):
(JSC::JSArray::sort):
(JSC::JSArray::sortVector):
(JSC::JSArray::fillArgList):
(JSC::JSArray::copyToArguments):
(JSC::JSArray::compactForSorting):

  • runtime/JSArray.h:

(JSC::JSArray::shiftCountForShift):
(JSC::JSArray::shiftCountForSplice):
(JSArray):
(JSC::JSArray::shiftCount):
(JSC::JSArray::unshiftCountForShift):
(JSC::JSArray::unshiftCountForSplice):
(JSC::JSArray::unshiftCount):
(JSC::JSArray::isLengthWritable):
(JSC::createContiguousArrayButterfly):
(JSC):
(JSC::JSArray::create):
(JSC::JSArray::tryCreateUninitialized):

  • runtime/JSGlobalObject.cpp:

(JSC::JSGlobalObject::reset):
(JSC):
(JSC::JSGlobalObject::haveABadTime):
(JSC::JSGlobalObject::visitChildren):

  • runtime/JSGlobalObject.h:

(JSGlobalObject):
(JSC::JSGlobalObject::arrayStructureWithArrayStorage):
(JSC::JSGlobalObject::addressOfArrayStructureWithArrayStorage):
(JSC::constructEmptyArray):

  • runtime/JSObject.cpp:

(JSC::JSObject::visitButterfly):
(JSC::JSObject::getOwnPropertySlotByIndex):
(JSC::JSObject::putByIndex):
(JSC::JSObject::enterDictionaryIndexingMode):
(JSC::JSObject::createInitialContiguous):
(JSC):
(JSC::JSObject::createArrayStorage):
(JSC::JSObject::convertContiguousToArrayStorage):
(JSC::JSObject::ensureContiguousSlow):
(JSC::JSObject::ensureArrayStorageSlow):
(JSC::JSObject::ensureIndexedStorageSlow):
(JSC::JSObject::ensureArrayStorageExistsAndEnterDictionaryIndexingMode):
(JSC::JSObject::switchToSlowPutArrayStorage):
(JSC::JSObject::setPrototype):
(JSC::JSObject::deletePropertyByIndex):
(JSC::JSObject::getOwnPropertyNames):
(JSC::JSObject::defineOwnIndexedProperty):
(JSC::JSObject::putByIndexBeyondVectorLengthContiguousWithoutAttributes):
(JSC::JSObject::putByIndexBeyondVectorLength):
(JSC::JSObject::putDirectIndexBeyondVectorLengthWithArrayStorage):
(JSC::JSObject::putDirectIndexBeyondVectorLength):
(JSC::JSObject::getNewVectorLength):
(JSC::JSObject::countElementsInContiguous):
(JSC::JSObject::increaseVectorLength):
(JSC::JSObject::ensureContiguousLengthSlow):
(JSC::JSObject::getOwnPropertyDescriptor):

  • runtime/JSObject.h:

(JSC::JSObject::getArrayLength):
(JSC::JSObject::getVectorLength):
(JSC::JSObject::canGetIndexQuickly):
(JSC::JSObject::getIndexQuickly):
(JSC::JSObject::tryGetIndexQuickly):
(JSC::JSObject::canSetIndexQuickly):
(JSC::JSObject::canSetIndexQuicklyForPutDirect):
(JSC::JSObject::setIndexQuickly):
(JSC::JSObject::initializeIndex):
(JSC::JSObject::hasSparseMap):
(JSC::JSObject::inSparseIndexingMode):
(JSObject):
(JSC::JSObject::ensureContiguous):
(JSC::JSObject::ensureIndexedStorage):
(JSC::JSObject::ensureContiguousLength):
(JSC::JSObject::indexingData):
(JSC::JSObject::relevantLength):

  • runtime/JSValue.cpp:

(JSC::JSValue::description):

  • runtime/Options.cpp:

(JSC::Options::initialize):

  • runtime/Structure.cpp:

(JSC::Structure::needsSlowPutIndexing):
(JSC):
(JSC::Structure::suggestedArrayStorageTransition):

  • runtime/Structure.h:

(Structure):

  • runtime/StructureTransitionTable.h:

(JSC::newIndexingType):

Source/WTF:

Moved out this helpful math utility to MathExtras, since we now use it in
multiple places.

  • wtf/MathExtras.h:

(timesThreePlusOneDividedByTwo):

File:
1 edited

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