| /* |
| * Copyright (C) 2012-2018 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "PutByIdStatus.h" |
| |
| #include "CodeBlock.h" |
| #include "ComplexGetStatus.h" |
| #include "GetterSetterAccessCase.h" |
| #include "LLIntData.h" |
| #include "LowLevelInterpreter.h" |
| #include "JSCInlines.h" |
| #include "PolymorphicAccess.h" |
| #include "Structure.h" |
| #include "StructureChain.h" |
| #include "StructureStubInfo.h" |
| #include <wtf/ListDump.h> |
| |
| namespace JSC { |
| |
| bool PutByIdStatus::appendVariant(const PutByIdVariant& variant) |
| { |
| for (unsigned i = 0; i < m_variants.size(); ++i) { |
| if (m_variants[i].attemptToMerge(variant)) |
| return true; |
| } |
| for (unsigned i = 0; i < m_variants.size(); ++i) { |
| if (m_variants[i].oldStructure().overlaps(variant.oldStructure())) |
| return false; |
| } |
| m_variants.append(variant); |
| return true; |
| } |
| |
| #if ENABLE(DFG_JIT) |
| bool PutByIdStatus::hasExitSite(CodeBlock* profiledBlock, unsigned bytecodeIndex) |
| { |
| UnlinkedCodeBlock* unlinkedCodeBlock = profiledBlock->unlinkedCodeBlock(); |
| ConcurrentJSLocker locker(unlinkedCodeBlock->m_lock); |
| return unlinkedCodeBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadCache)) |
| || unlinkedCodeBlock->hasExitSite(locker, DFG::FrequentExitSite(bytecodeIndex, BadConstantCache)); |
| } |
| #endif |
| |
| PutByIdStatus PutByIdStatus::computeFromLLInt(CodeBlock* profiledBlock, unsigned bytecodeIndex, UniquedStringImpl* uid) |
| { |
| UNUSED_PARAM(profiledBlock); |
| UNUSED_PARAM(bytecodeIndex); |
| UNUSED_PARAM(uid); |
| |
| VM& vm = *profiledBlock->vm(); |
| |
| Instruction* instruction = &profiledBlock->instructions()[bytecodeIndex]; |
| |
| StructureID structureID = instruction[4].u.structureID; |
| if (!structureID) |
| return PutByIdStatus(NoInformation); |
| |
| Structure* structure = vm.heap.structureIDTable().get(structureID); |
| |
| StructureID newStructureID = instruction[6].u.structureID; |
| if (!newStructureID) { |
| PropertyOffset offset = structure->getConcurrently(uid); |
| if (!isValidOffset(offset)) |
| return PutByIdStatus(NoInformation); |
| |
| return PutByIdVariant::replace(structure, offset, structure->inferredTypeDescriptorFor(uid)); |
| } |
| |
| Structure* newStructure = vm.heap.structureIDTable().get(newStructureID); |
| |
| ASSERT(structure->transitionWatchpointSetHasBeenInvalidated()); |
| |
| PropertyOffset offset = newStructure->getConcurrently(uid); |
| if (!isValidOffset(offset)) |
| return PutByIdStatus(NoInformation); |
| |
| ObjectPropertyConditionSet conditionSet; |
| if (!(instruction[8].u.putByIdFlags & PutByIdIsDirect)) { |
| conditionSet = |
| generateConditionsForPropertySetterMissConcurrently( |
| vm, profiledBlock->globalObject(), structure, uid); |
| if (!conditionSet.isValid()) |
| return PutByIdStatus(NoInformation); |
| } |
| |
| return PutByIdVariant::transition( |
| structure, newStructure, conditionSet, offset, newStructure->inferredTypeDescriptorFor(uid)); |
| } |
| |
| PutByIdStatus PutByIdStatus::computeFor(CodeBlock* profiledBlock, StubInfoMap& map, unsigned bytecodeIndex, UniquedStringImpl* uid) |
| { |
| ConcurrentJSLocker locker(profiledBlock->m_lock); |
| |
| UNUSED_PARAM(profiledBlock); |
| UNUSED_PARAM(bytecodeIndex); |
| UNUSED_PARAM(uid); |
| #if ENABLE(DFG_JIT) |
| if (hasExitSite(profiledBlock, bytecodeIndex)) |
| return PutByIdStatus(TakesSlowPath); |
| |
| StructureStubInfo* stubInfo = map.get(CodeOrigin(bytecodeIndex)); |
| PutByIdStatus result = computeForStubInfo( |
| locker, profiledBlock, stubInfo, uid, |
| CallLinkStatus::computeExitSiteData(profiledBlock, bytecodeIndex)); |
| if (!result) |
| return computeFromLLInt(profiledBlock, bytecodeIndex, uid); |
| |
| return result; |
| #else // ENABLE(JIT) |
| UNUSED_PARAM(map); |
| return PutByIdStatus(NoInformation); |
| #endif // ENABLE(JIT) |
| } |
| |
| #if ENABLE(JIT) |
| PutByIdStatus PutByIdStatus::computeForStubInfo(const ConcurrentJSLocker& locker, CodeBlock* baselineBlock, StructureStubInfo* stubInfo, CodeOrigin codeOrigin, UniquedStringImpl* uid) |
| { |
| return computeForStubInfo( |
| locker, baselineBlock, stubInfo, uid, |
| CallLinkStatus::computeExitSiteData(baselineBlock, codeOrigin.bytecodeIndex)); |
| } |
| |
| PutByIdStatus PutByIdStatus::computeForStubInfo( |
| const ConcurrentJSLocker& locker, CodeBlock* profiledBlock, StructureStubInfo* stubInfo, |
| UniquedStringImpl* uid, CallLinkStatus::ExitSiteData callExitSiteData) |
| { |
| if (!stubInfo || !stubInfo->everConsidered) |
| return PutByIdStatus(); |
| |
| if (stubInfo->tookSlowPath) |
| return PutByIdStatus(TakesSlowPath); |
| |
| switch (stubInfo->cacheType) { |
| case CacheType::Unset: |
| // This means that we attempted to cache but failed for some reason. |
| return PutByIdStatus(TakesSlowPath); |
| |
| case CacheType::PutByIdReplace: { |
| PropertyOffset offset = |
| stubInfo->u.byIdSelf.baseObjectStructure->getConcurrently(uid); |
| if (isValidOffset(offset)) { |
| return PutByIdVariant::replace( |
| stubInfo->u.byIdSelf.baseObjectStructure.get(), offset, InferredType::Top); |
| } |
| return PutByIdStatus(TakesSlowPath); |
| } |
| |
| case CacheType::Stub: { |
| PolymorphicAccess* list = stubInfo->u.stub; |
| |
| PutByIdStatus result; |
| result.m_state = Simple; |
| |
| State slowPathState = TakesSlowPath; |
| for (unsigned i = 0; i < list->size(); ++i) { |
| const AccessCase& access = list->at(i); |
| if (access.doesCalls()) |
| slowPathState = MakesCalls; |
| } |
| |
| for (unsigned i = 0; i < list->size(); ++i) { |
| const AccessCase& access = list->at(i); |
| if (access.viaProxy()) |
| return PutByIdStatus(slowPathState); |
| if (access.usesPolyProto()) |
| return PutByIdStatus(slowPathState); |
| |
| PutByIdVariant variant; |
| |
| switch (access.type()) { |
| case AccessCase::Replace: { |
| Structure* structure = access.structure(); |
| PropertyOffset offset = structure->getConcurrently(uid); |
| if (!isValidOffset(offset)) |
| return PutByIdStatus(slowPathState); |
| variant = PutByIdVariant::replace( |
| structure, offset, structure->inferredTypeDescriptorFor(uid)); |
| break; |
| } |
| |
| case AccessCase::Transition: { |
| PropertyOffset offset = |
| access.newStructure()->getConcurrently(uid); |
| if (!isValidOffset(offset)) |
| return PutByIdStatus(slowPathState); |
| ObjectPropertyConditionSet conditionSet = access.conditionSet(); |
| if (!conditionSet.structuresEnsureValidity()) |
| return PutByIdStatus(slowPathState); |
| variant = PutByIdVariant::transition( |
| access.structure(), access.newStructure(), conditionSet, offset, |
| access.newStructure()->inferredTypeDescriptorFor(uid)); |
| break; |
| } |
| |
| case AccessCase::Setter: { |
| Structure* structure = access.structure(); |
| |
| ComplexGetStatus complexGetStatus = ComplexGetStatus::computeFor( |
| structure, access.conditionSet(), uid); |
| |
| switch (complexGetStatus.kind()) { |
| case ComplexGetStatus::ShouldSkip: |
| continue; |
| |
| case ComplexGetStatus::TakesSlowPath: |
| return PutByIdStatus(slowPathState); |
| |
| case ComplexGetStatus::Inlineable: { |
| std::unique_ptr<CallLinkStatus> callLinkStatus = |
| std::make_unique<CallLinkStatus>(); |
| if (CallLinkInfo* callLinkInfo = access.as<GetterSetterAccessCase>().callLinkInfo()) { |
| *callLinkStatus = CallLinkStatus::computeFor( |
| locker, profiledBlock, *callLinkInfo, callExitSiteData); |
| } |
| |
| variant = PutByIdVariant::setter( |
| structure, complexGetStatus.offset(), complexGetStatus.conditionSet(), |
| WTFMove(callLinkStatus)); |
| } } |
| break; |
| } |
| |
| case AccessCase::CustomValueSetter: |
| case AccessCase::CustomAccessorSetter: |
| return PutByIdStatus(MakesCalls); |
| |
| default: |
| return PutByIdStatus(slowPathState); |
| } |
| |
| if (!result.appendVariant(variant)) |
| return PutByIdStatus(slowPathState); |
| } |
| |
| return result; |
| } |
| |
| default: |
| return PutByIdStatus(TakesSlowPath); |
| } |
| } |
| #endif |
| |
| PutByIdStatus PutByIdStatus::computeFor(CodeBlock* baselineBlock, CodeBlock* dfgBlock, StubInfoMap& baselineMap, StubInfoMap& dfgMap, CodeOrigin codeOrigin, UniquedStringImpl* uid) |
| { |
| #if ENABLE(DFG_JIT) |
| if (dfgBlock) { |
| if (hasExitSite(baselineBlock, codeOrigin.bytecodeIndex)) |
| return PutByIdStatus(TakesSlowPath); |
| CallLinkStatus::ExitSiteData exitSiteData; |
| { |
| ConcurrentJSLocker locker(baselineBlock->m_lock); |
| exitSiteData = CallLinkStatus::computeExitSiteData( |
| baselineBlock, codeOrigin.bytecodeIndex); |
| } |
| |
| PutByIdStatus result; |
| { |
| ConcurrentJSLocker locker(dfgBlock->m_lock); |
| result = computeForStubInfo( |
| locker, dfgBlock, dfgMap.get(codeOrigin), uid, exitSiteData); |
| } |
| |
| // We use TakesSlowPath in some cases where the stub was unset. That's weird and |
| // it would be better not to do that. But it means that we have to defend |
| // ourselves here. |
| if (result.isSimple()) |
| return result; |
| } |
| #else |
| UNUSED_PARAM(dfgBlock); |
| UNUSED_PARAM(dfgMap); |
| #endif |
| |
| return computeFor(baselineBlock, baselineMap, codeOrigin.bytecodeIndex, uid); |
| } |
| |
| PutByIdStatus PutByIdStatus::computeFor(JSGlobalObject* globalObject, const StructureSet& set, UniquedStringImpl* uid, bool isDirect) |
| { |
| if (parseIndex(*uid)) |
| return PutByIdStatus(TakesSlowPath); |
| |
| if (set.isEmpty()) |
| return PutByIdStatus(); |
| |
| VM& vm = globalObject->vm(); |
| PutByIdStatus result; |
| result.m_state = Simple; |
| for (unsigned i = 0; i < set.size(); ++i) { |
| Structure* structure = set[i]; |
| |
| if (structure->typeInfo().overridesGetOwnPropertySlot() && structure->typeInfo().type() != GlobalObjectType) |
| return PutByIdStatus(TakesSlowPath); |
| |
| if (!structure->propertyAccessesAreCacheable()) |
| return PutByIdStatus(TakesSlowPath); |
| |
| unsigned attributes; |
| PropertyOffset offset = structure->getConcurrently(uid, attributes); |
| if (isValidOffset(offset)) { |
| if (attributes & PropertyAttribute::CustomAccessor) |
| return PutByIdStatus(MakesCalls); |
| |
| if (attributes & (PropertyAttribute::Accessor | PropertyAttribute::ReadOnly)) |
| return PutByIdStatus(TakesSlowPath); |
| |
| WatchpointSet* replaceSet = structure->propertyReplacementWatchpointSet(offset); |
| if (!replaceSet || replaceSet->isStillValid()) { |
| // When this executes, it'll create, and fire, this replacement watchpoint set. |
| // That means that this has probably never executed or that something fishy is |
| // going on. Also, we cannot create or fire the watchpoint set from the concurrent |
| // JIT thread, so even if we wanted to do this, we'd need to have a lazy thingy. |
| // So, better leave this alone and take slow path. |
| return PutByIdStatus(TakesSlowPath); |
| } |
| |
| PutByIdVariant variant = |
| PutByIdVariant::replace(structure, offset, structure->inferredTypeDescriptorFor(uid)); |
| if (!result.appendVariant(variant)) |
| return PutByIdStatus(TakesSlowPath); |
| continue; |
| } |
| |
| // Our hypothesis is that we're doing a transition. Before we prove that this is really |
| // true, we want to do some sanity checks. |
| |
| // Don't cache put transitions on dictionaries. |
| if (structure->isDictionary()) |
| return PutByIdStatus(TakesSlowPath); |
| |
| // If the structure corresponds to something that isn't an object, then give up, since |
| // we don't want to be adding properties to strings. |
| if (!structure->typeInfo().isObject()) |
| return PutByIdStatus(TakesSlowPath); |
| |
| ObjectPropertyConditionSet conditionSet; |
| if (!isDirect) { |
| conditionSet = generateConditionsForPropertySetterMissConcurrently( |
| vm, globalObject, structure, uid); |
| if (!conditionSet.isValid()) |
| return PutByIdStatus(TakesSlowPath); |
| } |
| |
| // We only optimize if there is already a structure that the transition is cached to. |
| Structure* transition = |
| Structure::addPropertyTransitionToExistingStructureConcurrently(structure, uid, 0, offset); |
| if (!transition) |
| return PutByIdStatus(TakesSlowPath); |
| ASSERT(isValidOffset(offset)); |
| |
| bool didAppend = result.appendVariant( |
| PutByIdVariant::transition( |
| structure, transition, conditionSet, offset, |
| transition->inferredTypeDescriptorFor(uid))); |
| if (!didAppend) |
| return PutByIdStatus(TakesSlowPath); |
| } |
| |
| return result; |
| } |
| |
| bool PutByIdStatus::makesCalls() const |
| { |
| if (m_state == MakesCalls) |
| return true; |
| |
| if (m_state != Simple) |
| return false; |
| |
| for (unsigned i = m_variants.size(); i--;) { |
| if (m_variants[i].makesCalls()) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void PutByIdStatus::dump(PrintStream& out) const |
| { |
| switch (m_state) { |
| case NoInformation: |
| out.print("(NoInformation)"); |
| return; |
| |
| case Simple: |
| out.print("(", listDump(m_variants), ")"); |
| return; |
| |
| case TakesSlowPath: |
| out.print("(TakesSlowPath)"); |
| return; |
| case MakesCalls: |
| out.print("(MakesCalls)"); |
| return; |
| } |
| |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| } // namespace JSC |
| |
