Ignore:
Timestamp:
Sep 25, 2014, 8:59:33 PM (11 years ago)
Author:
[email protected]
Message:

FTL should sink object allocations
​https://bugs.webkit.org/show_bug.cgi?id=136330

Reviewed by Oliver Hunt.
Source/JavaScriptCore:


This adds a comprehensive infrastructure for sinking object allocations in DFG SSA form. The
ultimate goal of sinking is to sink an allocation "past the points of its death" - i.e. to
eliminate it completely. The way sinking reasons about the CFG means that it resembles a
partial escape analysis: we create paths through a function where some allocation(s) don't
have to be done at all even if there are other paths along which those allocations still have
to happen. But it also produces other side benefits. Even if an allocation isn't eliminated
along any path, the act of sinking reduces the number of barriers that have to execute.

Because this was a fairly ambituous SSA analysis and transformation, I added a bunch of C++11
sugar to the DFG's internal APIs to allow for easier iteration over blocks, nodes, and
successors; and to add more functor goodness to allow for more lambdas.

This is just the beginning. The bug has a bunch of other bugs that depend on it. So far this
is a spectacular speed-up on microbenchmarks but it's still too limited to affect big
benchmarks. For example, doing o == p makes the sinking phase think that o and p escape.
That's just an omission and there are likely others; we can easily fix them. I think it's
best to land it in its current form and then to worry about the big benchmarks in subsequent
work (see bug 137126).

(JSC::StructureSet::iterator::iterator):
(JSC::StructureSet::iterator::operator*):
(JSC::StructureSet::iterator::operator++):
(JSC::StructureSet::iterator::operator==):
(JSC::StructureSet::iterator::operator!=):
(JSC::StructureSet::begin):
(JSC::StructureSet::end):

  • dfg/DFGAbstractInterpreter.h:

(JSC::DFG::AbstractInterpreter::phiChildren):

  • dfg/DFGAbstractInterpreterInlines.h:

(JSC::DFG::AbstractInterpreter<AbstractStateType>::AbstractInterpreter):
(JSC::DFG::AbstractInterpreter<AbstractStateType>::startExecuting):
(JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
(JSC::DFG::AbstractInterpreter<AbstractStateType>::execute):

  • dfg/DFGAvailability.h:

(JSC::DFG::Availability::shouldUseNode):
(JSC::DFG::Availability::isFlushUseful):
(JSC::DFG::Availability::isDead):
(JSC::DFG::Availability::operator!=):

  • dfg/DFGAvailabilityMap.cpp: Added.

(JSC::DFG::AvailabilityMap::prune):
(JSC::DFG::AvailabilityMap::clear):
(JSC::DFG::AvailabilityMap::dump):
(JSC::DFG::AvailabilityMap::operator==):
(JSC::DFG::AvailabilityMap::merge):

  • dfg/DFGAvailabilityMap.h: Added.

(JSC::DFG::AvailabilityMap::forEachAvailability):

  • dfg/DFGBasicBlock.cpp:

(JSC::DFG::BasicBlock::SSAData::SSAData):

  • dfg/DFGBasicBlock.h:

(JSC::DFG::BasicBlock::begin):
(JSC::DFG::BasicBlock::end):
(JSC::DFG::BasicBlock::SuccessorsIterable::SuccessorsIterable):
(JSC::DFG::BasicBlock::SuccessorsIterable::iterator::iterator):
(JSC::DFG::BasicBlock::SuccessorsIterable::iterator::operator*):
(JSC::DFG::BasicBlock::SuccessorsIterable::iterator::operator++):
(JSC::DFG::BasicBlock::SuccessorsIterable::iterator::operator==):
(JSC::DFG::BasicBlock::SuccessorsIterable::iterator::operator!=):
(JSC::DFG::BasicBlock::SuccessorsIterable::begin):
(JSC::DFG::BasicBlock::SuccessorsIterable::end):
(JSC::DFG::BasicBlock::successors):

  • dfg/DFGClobberize.h:

(JSC::DFG::clobberize):

  • dfg/DFGConstantFoldingPhase.cpp:

(JSC::DFG::ConstantFoldingPhase::foldConstants):

  • dfg/DFGDoesGC.cpp:

(JSC::DFG::doesGC):

  • dfg/DFGFixupPhase.cpp:

(JSC::DFG::FixupPhase::fixupNode):

  • dfg/DFGFlushedAt.cpp:

(JSC::DFG::FlushedAt::dump):

  • dfg/DFGFlushedAt.h:

(JSC::DFG::FlushedAt::FlushedAt):

  • dfg/DFGGraph.cpp:

(JSC::DFG::Graph::dump):
(JSC::DFG::Graph::dumpBlockHeader):
(JSC::DFG::Graph::mergeRelevantToOSR):
(JSC::DFG::Graph::invalidateCFG):

  • dfg/DFGGraph.h:

(JSC::DFG::Graph::NaturalBlockIterable::NaturalBlockIterable):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::iterator):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::operator*):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::operator++):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::operator==):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::operator!=):
(JSC::DFG::Graph::NaturalBlockIterable::iterator::findNext):
(JSC::DFG::Graph::NaturalBlockIterable::begin):
(JSC::DFG::Graph::NaturalBlockIterable::end):
(JSC::DFG::Graph::blocksInNaturalOrder):
(JSC::DFG::Graph::doToChildrenWithNode):
(JSC::DFG::Graph::doToChildren):

  • dfg/DFGHeapLocation.cpp:

(WTF::printInternal):

  • dfg/DFGHeapLocation.h:
  • dfg/DFGInsertOSRHintsForUpdate.cpp: Added.

(JSC::DFG::insertOSRHintsForUpdate):

  • dfg/DFGInsertOSRHintsForUpdate.h: Added.
  • dfg/DFGInsertionSet.h:

(JSC::DFG::InsertionSet::graph):

  • dfg/DFGMayExit.cpp:

(JSC::DFG::mayExit):

  • dfg/DFGNode.h:

(JSC::DFG::Node::convertToPutByOffsetHint):
(JSC::DFG::Node::convertToPutStructureHint):
(JSC::DFG::Node::convertToPhantomNewObject):
(JSC::DFG::Node::isCellConstant):
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::hasIdentifier):
(JSC::DFG::Node::hasStorageAccessData):
(JSC::DFG::Node::hasObjectMaterializationData):
(JSC::DFG::Node::objectMaterializationData):
(JSC::DFG::Node::isPhantomObjectAllocation):

  • dfg/DFGNodeType.h:
  • dfg/DFGOSRAvailabilityAnalysisPhase.cpp:

(JSC::DFG::OSRAvailabilityAnalysisPhase::run):
(JSC::DFG::LocalOSRAvailabilityCalculator::endBlock):
(JSC::DFG::LocalOSRAvailabilityCalculator::executeNode):

  • dfg/DFGOSRAvailabilityAnalysisPhase.h:
  • dfg/DFGObjectAllocationSinkingPhase.cpp: Added.

(JSC::DFG::ObjectAllocationSinkingPhase::ObjectAllocationSinkingPhase):
(JSC::DFG::ObjectAllocationSinkingPhase::run):
(JSC::DFG::ObjectAllocationSinkingPhase::performSinking):
(JSC::DFG::ObjectAllocationSinkingPhase::determineMaterializationPoints):
(JSC::DFG::ObjectAllocationSinkingPhase::placeMaterializationPoints):
(JSC::DFG::ObjectAllocationSinkingPhase::lowerNonReadingOperationsOnPhantomAllocations):
(JSC::DFG::ObjectAllocationSinkingPhase::promoteSunkenFields):
(JSC::DFG::ObjectAllocationSinkingPhase::resolve):
(JSC::DFG::ObjectAllocationSinkingPhase::handleNode):
(JSC::DFG::ObjectAllocationSinkingPhase::createMaterialize):
(JSC::DFG::ObjectAllocationSinkingPhase::populateMaterialize):
(JSC::DFG::performObjectAllocationSinking):

  • dfg/DFGObjectAllocationSinkingPhase.h: Added.
  • dfg/DFGObjectMaterializationData.cpp: Added.

(JSC::DFG::PhantomPropertyValue::dump):
(JSC::DFG::ObjectMaterializationData::dump):
(JSC::DFG::ObjectMaterializationData::oneWaySimilarityScore):
(JSC::DFG::ObjectMaterializationData::similarityScore):

  • dfg/DFGObjectMaterializationData.h: Added.

(JSC::DFG::PhantomPropertyValue::PhantomPropertyValue):
(JSC::DFG::PhantomPropertyValue::operator==):

  • dfg/DFGPhantomCanonicalizationPhase.cpp:

(JSC::DFG::PhantomCanonicalizationPhase::run):

  • dfg/DFGPhantomRemovalPhase.cpp:

(JSC::DFG::PhantomRemovalPhase::run):

  • dfg/DFGPhiChildren.cpp: Added.

(JSC::DFG::PhiChildren::PhiChildren):
(JSC::DFG::PhiChildren::~PhiChildren):
(JSC::DFG::PhiChildren::upsilonsOf):

  • dfg/DFGPhiChildren.h: Added.

(JSC::DFG::PhiChildren::forAllIncomingValues):
(JSC::DFG::PhiChildren::forAllTransitiveIncomingValues):

  • dfg/DFGPlan.cpp:

(JSC::DFG::Plan::compileInThreadImpl):

  • dfg/DFGPrePostNumbering.cpp: Added.

(JSC::DFG::PrePostNumbering::PrePostNumbering):
(JSC::DFG::PrePostNumbering::~PrePostNumbering):
(JSC::DFG::PrePostNumbering::compute):
(WTF::printInternal):

  • dfg/DFGPrePostNumbering.h: Added.

(JSC::DFG::PrePostNumbering::preNumber):
(JSC::DFG::PrePostNumbering::postNumber):
(JSC::DFG::PrePostNumbering::isStrictAncestorOf):
(JSC::DFG::PrePostNumbering::isAncestorOf):
(JSC::DFG::PrePostNumbering::isStrictDescendantOf):
(JSC::DFG::PrePostNumbering::isDescendantOf):
(JSC::DFG::PrePostNumbering::edgeKind):

  • dfg/DFGPredictionPropagationPhase.cpp:

(JSC::DFG::PredictionPropagationPhase::propagate):

  • dfg/DFGPromoteHeapAccess.h: Added.

(JSC::DFG::promoteHeapAccess):

  • dfg/DFGPromotedHeapLocation.cpp: Added.

(JSC::DFG::PromotedLocationDescriptor::dump):
(JSC::DFG::PromotedHeapLocation::createHint):
(JSC::DFG::PromotedHeapLocation::dump):
(WTF::printInternal):

  • dfg/DFGPromotedHeapLocation.h: Added.

(JSC::DFG::PromotedLocationDescriptor::PromotedLocationDescriptor):
(JSC::DFG::PromotedLocationDescriptor::operator!):
(JSC::DFG::PromotedLocationDescriptor::kind):
(JSC::DFG::PromotedLocationDescriptor::info):
(JSC::DFG::PromotedLocationDescriptor::hash):
(JSC::DFG::PromotedLocationDescriptor::operator==):
(JSC::DFG::PromotedLocationDescriptor::operator!=):
(JSC::DFG::PromotedLocationDescriptor::isHashTableDeletedValue):
(JSC::DFG::PromotedHeapLocation::PromotedHeapLocation):
(JSC::DFG::PromotedHeapLocation::operator!):
(JSC::DFG::PromotedHeapLocation::kind):
(JSC::DFG::PromotedHeapLocation::base):
(JSC::DFG::PromotedHeapLocation::info):
(JSC::DFG::PromotedHeapLocation::descriptor):
(JSC::DFG::PromotedHeapLocation::hash):
(JSC::DFG::PromotedHeapLocation::operator==):
(JSC::DFG::PromotedHeapLocation::isHashTableDeletedValue):
(JSC::DFG::PromotedHeapLocationHash::hash):
(JSC::DFG::PromotedHeapLocationHash::equal):

  • dfg/DFGSSACalculator.cpp:

(JSC::DFG::SSACalculator::reset):

  • dfg/DFGSSACalculator.h:
  • dfg/DFGSafeToExecute.h:

(JSC::DFG::safeToExecute):

  • dfg/DFGSpeculativeJIT.cpp:

(JSC::DFG::SpeculativeJIT::compileCurrentBlock):

  • dfg/DFGSpeculativeJIT32_64.cpp:

(JSC::DFG::SpeculativeJIT::compile):

  • dfg/DFGSpeculativeJIT64.cpp:

(JSC::DFG::SpeculativeJIT::compile):

  • dfg/DFGStructureRegistrationPhase.cpp:

(JSC::DFG::StructureRegistrationPhase::run):

  • dfg/DFGValidate.cpp:

(JSC::DFG::Validate::validate):

  • ftl/FTLCapabilities.cpp:

(JSC::FTL::canCompile):

  • ftl/FTLExitPropertyValue.cpp: Added.

(JSC::FTL::ExitPropertyValue::dump):

  • ftl/FTLExitPropertyValue.h: Added.

(JSC::FTL::ExitPropertyValue::ExitPropertyValue):
(JSC::FTL::ExitPropertyValue::operator!):
(JSC::FTL::ExitPropertyValue::location):
(JSC::FTL::ExitPropertyValue::value):

  • ftl/FTLExitTimeObjectMaterialization.cpp: Added.

(JSC::FTL::ExitTimeObjectMaterialization::ExitTimeObjectMaterialization):
(JSC::FTL::ExitTimeObjectMaterialization::~ExitTimeObjectMaterialization):
(JSC::FTL::ExitTimeObjectMaterialization::add):
(JSC::FTL::ExitTimeObjectMaterialization::get):
(JSC::FTL::ExitTimeObjectMaterialization::dump):

  • ftl/FTLExitTimeObjectMaterialization.h: Added.

(JSC::FTL::ExitTimeObjectMaterialization::type):
(JSC::FTL::ExitTimeObjectMaterialization::properties):

  • ftl/FTLExitValue.cpp:

(JSC::FTL::ExitValue::materializeNewObject):
(JSC::FTL::ExitValue::dumpInContext):

  • ftl/FTLExitValue.h:

(JSC::FTL::ExitValue::isObjectMaterialization):
(JSC::FTL::ExitValue::objectMaterialization):
(JSC::FTL::ExitValue::withVirtualRegister):
(JSC::FTL::ExitValue::valueFormat):

  • ftl/FTLLowerDFGToLLVM.cpp:

(JSC::FTL::LowerDFGToLLVM::compileNode):
(JSC::FTL::LowerDFGToLLVM::compileCheckStructure):
(JSC::FTL::LowerDFGToLLVM::compileArrayifyToStructure):
(JSC::FTL::LowerDFGToLLVM::compilePutStructure):
(JSC::FTL::LowerDFGToLLVM::compileNewObject):
(JSC::FTL::LowerDFGToLLVM::compileMultiGetByOffset):
(JSC::FTL::LowerDFGToLLVM::compileMultiPutByOffset):
(JSC::FTL::LowerDFGToLLVM::compileInvalidationPoint):
(JSC::FTL::LowerDFGToLLVM::compileCheckStructureImmediate):
(JSC::FTL::LowerDFGToLLVM::compileMaterializeNewObject):
(JSC::FTL::LowerDFGToLLVM::checkStructure):
(JSC::FTL::LowerDFGToLLVM::allocateCell):
(JSC::FTL::LowerDFGToLLVM::storeStructure):
(JSC::FTL::LowerDFGToLLVM::allocateObject):
(JSC::FTL::LowerDFGToLLVM::speculateStringObjectForStructureID):
(JSC::FTL::LowerDFGToLLVM::appendOSRExit):
(JSC::FTL::LowerDFGToLLVM::buildExitArguments):
(JSC::FTL::LowerDFGToLLVM::exitValueForAvailability):
(JSC::FTL::LowerDFGToLLVM::exitValueForNode):
(JSC::FTL::LowerDFGToLLVM::weakStructureID):
(JSC::FTL::LowerDFGToLLVM::weakStructure):
(JSC::FTL::LowerDFGToLLVM::availabilityMap):
(JSC::FTL::LowerDFGToLLVM::availability): Deleted.

  • ftl/FTLOSRExit.h:
  • ftl/FTLOSRExitCompiler.cpp:

(JSC::FTL::compileRecovery):
(JSC::FTL::compileStub):

  • ftl/FTLOperations.cpp: Added.

(JSC::FTL::operationNewObjectWithButterfly):
(JSC::FTL::operationMaterializeObjectInOSR):

  • ftl/FTLOperations.h: Added.
  • ftl/FTLSwitchCase.h:

(JSC::FTL::SwitchCase::SwitchCase):

  • runtime/JSObject.h:

(JSC::JSObject::finishCreation):
(JSC::JSFinalObject::JSFinalObject):
(JSC::JSFinalObject::create):

  • runtime/Structure.cpp:

(JSC::Structure::canUseForAllocationsOf):

  • runtime/Structure.h:
  • tests/stress/elidable-new-object-roflcopter-then-exit.js: Added.

(sumOfArithSeries):
(foo):

  • tests/stress/elide-new-object-dag-then-exit.js: Added.

(sumOfArithSeries):
(bar):
(verify):
(foo):

  • tests/stress/obviously-elidable-new-object-then-exit.js: Added.

(sumOfArithSeries):
(foo):

Source/WTF:


Make it possible to reset a Bag.

  • wtf/Bag.h:

(WTF::Bag::Bag):
(WTF::Bag::~Bag):
(WTF::Bag::clear):

LayoutTests:

  • js/math-denorm.html: Added.
  • js/regress/elidable-new-object-dag-expected.txt: Added.
  • js/regress/elidable-new-object-dag.html: Added.
  • js/regress/elidable-new-object-roflcopter-expected.txt: Added.
  • js/regress/elidable-new-object-roflcopter.html: Added.
  • js/regress/elidable-new-object-tree-expected.txt: Added.
  • js/regress/elidable-new-object-tree.html: Added.
  • js/regress/obvious-sink-pathology-expected.txt: Added.
  • js/regress/obvious-sink-pathology-taken-expected.txt: Added.
  • js/regress/obvious-sink-pathology-taken.html: Added.
  • js/regress/obvious-sink-pathology.html: Added.
  • js/regress/obviously-elidable-new-object-expected.txt: Added.
  • js/regress/obviously-elidable-new-object.html: Added.
  • js/regress/script-tests/elidable-new-object-dag.js: Added.

(sumOfArithSeries):
(foo):

  • js/regress/script-tests/elidable-new-object-roflcopter.js: Added.

(sumOfArithSeries):
(foo):

  • js/regress/script-tests/elidable-new-object-tree.js: Added.

(sumOfArithSeries):
(foo):

  • js/regress/script-tests/obvious-sink-pathology-taken.js: Added.

(sumOfArithSeries):
(bar):
(foo):

  • js/regress/script-tests/obvious-sink-pathology.js: Added.

(sumOfArithSeries):
(bar):
(foo):

  • js/regress/script-tests/obviously-elidable-new-object.js: Added.

(sumOfArithSeries):
(foo):

  • js/regress/script-tests/sinkable-new-object-dag.js: Added.

(sumOfArithSeries):
(verify):
(foo):

  • js/regress/script-tests/sinkable-new-object-taken.js: Added.

(sumOfArithSeries):
(bar):
(foo):

  • js/regress/script-tests/sinkable-new-object.js: Added.

(sumOfArithSeries):
(bar):
(foo):

  • js/regress/sinkable-new-object-dag-expected.txt: Added.
  • js/regress/sinkable-new-object-dag.html: Added.
  • js/regress/sinkable-new-object-expected.txt: Added.
  • js/regress/sinkable-new-object-taken-expected.txt: Added.
  • js/regress/sinkable-new-object-taken.html: Added.
  • js/regress/sinkable-new-object.html: Added.
File:
1 edited

Legend:

Unmodified
Added
Removed

  • trunk/Source/JavaScriptCore/dfg/DFGValidate.cpp

    r173413 r173993  
    188188                if (m_graph.m_refCountState == ExactRefCount)
    189189                    V_EQUAL((node), m_myRefCounts.get(node), node->adjustedRefCount());
    190                 else
    191                     V_EQUAL((node), node->refCount(), 1);
    192190            }
    193191           
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