mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
617 lines
23 KiB
C++
617 lines
23 KiB
C++
/*
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* Copyright (C) 2012-2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "GetByStatus.h"
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#include "BytecodeStructs.h"
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#include "CacheableIdentifierInlines.h"
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#include "CodeBlock.h"
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#include "ComplexGetStatus.h"
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#include "GetterSetterAccessCase.h"
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#include "ICStatusUtils.h"
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#include "IntrinsicGetterAccessCase.h"
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#include "ModuleNamespaceAccessCase.h"
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#include "PolymorphicAccess.h"
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#include "StructureStubInfo.h"
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#include <wtf/ListDump.h>
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namespace JSC {
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bool GetByStatus::appendVariant(const GetByIdVariant& variant)
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{
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return appendICStatusVariant(m_variants, variant);
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}
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GetByStatus GetByStatus::computeFromLLInt(CodeBlock* profiledBlock, BytecodeIndex bytecodeIndex)
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{
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VM& vm = profiledBlock->vm();
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auto instruction = profiledBlock->instructions().at(bytecodeIndex.offset());
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StructureID structureID;
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const Identifier* identifier = nullptr;
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switch (instruction->opcodeID()) {
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case op_get_by_id: {
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auto& metadata = instruction->as<OpGetById>().metadata(profiledBlock);
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// FIXME: We should not just bail if we see a get_by_id_proto_load.
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// https://bugs.webkit.org/show_bug.cgi?id=158039
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if (metadata.m_modeMetadata.mode != GetByIdMode::Default)
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return GetByStatus(NoInformation, false);
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structureID = metadata.m_modeMetadata.defaultMode.structureID;
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identifier = &(profiledBlock->identifier(instruction->as<OpGetById>().m_property));
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break;
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}
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case op_get_by_id_direct:
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structureID = instruction->as<OpGetByIdDirect>().metadata(profiledBlock).m_structureID;
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identifier = &(profiledBlock->identifier(instruction->as<OpGetByIdDirect>().m_property));
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break;
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case op_try_get_by_id: {
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// FIXME: We should not just bail if we see a try_get_by_id.
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// https://bugs.webkit.org/show_bug.cgi?id=158039
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return GetByStatus(NoInformation, false);
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}
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case op_get_by_val:
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return GetByStatus(NoInformation, false);
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case op_iterator_open: {
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ASSERT(bytecodeIndex.checkpoint() == OpIteratorOpen::getNext);
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auto& metadata = instruction->as<OpIteratorOpen>().metadata(profiledBlock);
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// FIXME: We should not just bail if we see a get_by_id_proto_load.
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// https://bugs.webkit.org/show_bug.cgi?id=158039
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if (metadata.m_modeMetadata.mode != GetByIdMode::Default)
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return GetByStatus(NoInformation, false);
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structureID = metadata.m_modeMetadata.defaultMode.structureID;
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identifier = &vm.propertyNames->next;
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break;
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}
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case op_iterator_next: {
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auto& metadata = instruction->as<OpIteratorNext>().metadata(profiledBlock);
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if (bytecodeIndex.checkpoint() == OpIteratorNext::getDone) {
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if (metadata.m_doneModeMetadata.mode != GetByIdMode::Default)
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return GetByStatus(NoInformation, false);
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structureID = metadata.m_doneModeMetadata.defaultMode.structureID;
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identifier = &vm.propertyNames->done;
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} else {
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ASSERT(bytecodeIndex.checkpoint() == OpIteratorNext::getValue);
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if (metadata.m_valueModeMetadata.mode != GetByIdMode::Default)
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return GetByStatus(NoInformation, false);
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structureID = metadata.m_valueModeMetadata.defaultMode.structureID;
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identifier = &vm.propertyNames->value;
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}
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break;
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}
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case op_get_private_name:
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// FIXME: Consider using LLInt caches or IC information to populate GetByStatus
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// https://bugs.webkit.org/show_bug.cgi?id=217245
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return GetByStatus(NoInformation, false);
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default: {
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ASSERT_NOT_REACHED();
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return GetByStatus(NoInformation, false);
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}
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}
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if (!structureID)
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return GetByStatus(NoInformation, false);
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Structure* structure = vm.heap.structureIDTable().get(structureID);
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if (structure->takesSlowPathInDFGForImpureProperty())
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return GetByStatus(NoInformation, false);
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unsigned attributes;
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PropertyOffset offset = structure->getConcurrently(identifier->impl(), attributes);
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if (!isValidOffset(offset))
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return GetByStatus(NoInformation, false);
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if (attributes & PropertyAttribute::CustomAccessorOrValue)
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return GetByStatus(NoInformation, false);
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GetByStatus result(Simple, false);
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result.appendVariant(GetByIdVariant(nullptr, StructureSet(structure), offset));
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return result;
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}
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GetByStatus GetByStatus::computeFor(CodeBlock* profiledBlock, ICStatusMap& map, BytecodeIndex bytecodeIndex, ExitFlag didExit, CallLinkStatus::ExitSiteData callExitSiteData)
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{
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ConcurrentJSLocker locker(profiledBlock->m_lock);
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GetByStatus result;
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#if ENABLE(DFG_JIT)
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result = computeForStubInfoWithoutExitSiteFeedback(
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locker, profiledBlock, map.get(CodeOrigin(bytecodeIndex)).stubInfo, callExitSiteData);
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if (didExit)
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return result.slowVersion();
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#else
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UNUSED_PARAM(map);
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UNUSED_PARAM(didExit);
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UNUSED_PARAM(callExitSiteData);
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#endif
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if (!result)
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return computeFromLLInt(profiledBlock, bytecodeIndex);
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return result;
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}
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#if ENABLE(JIT)
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GetByStatus::GetByStatus(StubInfoSummary summary, StructureStubInfo& stubInfo)
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: m_wasSeenInJIT(true)
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{
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switch (summary) {
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case StubInfoSummary::NoInformation:
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m_state = NoInformation;
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return;
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case StubInfoSummary::Simple:
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case StubInfoSummary::MakesCalls:
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RELEASE_ASSERT_NOT_REACHED();
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return;
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case StubInfoSummary::TakesSlowPath:
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m_state = stubInfo.tookSlowPath ? ObservedTakesSlowPath : LikelyTakesSlowPath;
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return;
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case StubInfoSummary::TakesSlowPathAndMakesCalls:
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m_state = stubInfo.tookSlowPath ? ObservedSlowPathAndMakesCalls : MakesCalls;
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return;
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}
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RELEASE_ASSERT_NOT_REACHED();
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}
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GetByStatus::GetByStatus(const ModuleNamespaceAccessCase& accessCase)
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: m_moduleNamespaceData(Box<ModuleNamespaceData>::create(ModuleNamespaceData { accessCase.moduleNamespaceObject(), accessCase.moduleEnvironment(), accessCase.scopeOffset(), accessCase.identifier() }))
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, m_state(ModuleNamespace)
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, m_wasSeenInJIT(true)
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{
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}
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GetByStatus GetByStatus::computeForStubInfoWithoutExitSiteFeedback(
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const ConcurrentJSLocker& locker, CodeBlock* profiledBlock, StructureStubInfo* stubInfo, CallLinkStatus::ExitSiteData callExitSiteData)
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{
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StubInfoSummary summary = StructureStubInfo::summary(profiledBlock->vm(), stubInfo);
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if (!isInlineable(summary))
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return GetByStatus(summary, *stubInfo);
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// Finally figure out if we can derive an access strategy.
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GetByStatus result;
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result.m_state = Simple;
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result.m_wasSeenInJIT = true; // This is interesting for bytecode dumping only.
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switch (stubInfo->cacheType()) {
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case CacheType::Unset:
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return GetByStatus(NoInformation);
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case CacheType::GetByIdSelf: {
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Structure* structure = stubInfo->u.byIdSelf.baseObjectStructure.get();
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if (structure->takesSlowPathInDFGForImpureProperty())
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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CacheableIdentifier identifier = stubInfo->identifier();
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UniquedStringImpl* uid = identifier.uid();
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RELEASE_ASSERT(uid);
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GetByIdVariant variant(WTFMove(identifier));
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unsigned attributes;
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variant.m_offset = structure->getConcurrently(uid, attributes);
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if (!isValidOffset(variant.m_offset))
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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if (attributes & PropertyAttribute::CustomAccessorOrValue)
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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variant.m_structureSet.add(structure);
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bool didAppend = result.appendVariant(variant);
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ASSERT_UNUSED(didAppend, didAppend);
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return result;
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}
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case CacheType::Stub: {
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PolymorphicAccess* list = stubInfo->u.stub;
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if (list->size() == 1) {
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const AccessCase& access = list->at(0);
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switch (access.type()) {
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case AccessCase::ModuleNamespaceLoad:
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return GetByStatus(access.as<ModuleNamespaceAccessCase>());
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default:
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break;
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}
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}
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for (unsigned listIndex = 0; listIndex < list->size(); ++listIndex) {
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const AccessCase& access = list->at(listIndex);
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if (access.viaProxy())
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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if (access.usesPolyProto())
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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if (!access.requiresIdentifierNameMatch()) {
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// FIXME: We could use this for indexed loads in the future. This is pretty solid profiling
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// information, and probably better than ArrayProfile when it's available.
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// https://bugs.webkit.org/show_bug.cgi?id=204215
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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}
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Structure* structure = access.structure();
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if (!structure) {
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// The null structure cases arise due to array.length and string.length. We have no way
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// of creating a GetByIdVariant for those, and we don't really have to since the DFG
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// handles those cases in FixupPhase using value profiling. That's a bit awkward - we
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// shouldn't have to use value profiling to discover something that the AccessCase
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// could have told us. But, it works well enough. So, our only concern here is to not
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// crash on null structure.
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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}
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ComplexGetStatus complexGetStatus = ComplexGetStatus::computeFor(
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structure, access.conditionSet(), access.uid());
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switch (complexGetStatus.kind()) {
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case ComplexGetStatus::ShouldSkip:
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continue;
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case ComplexGetStatus::TakesSlowPath:
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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case ComplexGetStatus::Inlineable: {
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std::unique_ptr<CallLinkStatus> callLinkStatus;
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JSFunction* intrinsicFunction = nullptr;
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FunctionPtr<CustomAccessorPtrTag> customAccessorGetter;
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std::unique_ptr<DOMAttributeAnnotation> domAttribute;
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bool haveDOMAttribute = false;
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switch (access.type()) {
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case AccessCase::Load:
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case AccessCase::GetGetter:
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case AccessCase::Miss: {
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break;
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}
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case AccessCase::IntrinsicGetter: {
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intrinsicFunction = access.as<IntrinsicGetterAccessCase>().intrinsicFunction();
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break;
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}
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case AccessCase::Getter: {
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callLinkStatus = makeUnique<CallLinkStatus>();
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if (CallLinkInfo* callLinkInfo = access.as<GetterSetterAccessCase>().callLinkInfo()) {
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*callLinkStatus = CallLinkStatus::computeFor(
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locker, profiledBlock, *callLinkInfo, callExitSiteData);
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}
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break;
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}
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case AccessCase::CustomAccessorGetter: {
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customAccessorGetter = access.as<GetterSetterAccessCase>().customAccessor();
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if (!access.as<GetterSetterAccessCase>().domAttribute())
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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domAttribute = WTF::makeUnique<DOMAttributeAnnotation>(*access.as<GetterSetterAccessCase>().domAttribute());
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haveDOMAttribute = true;
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result.m_state = Custom;
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break;
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}
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default: {
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// FIXME: It would be totally sweet to support more of these at some point in the
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// future. https://bugs.webkit.org/show_bug.cgi?id=133052
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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} }
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ASSERT((AccessCase::Miss == access.type() || access.isCustom()) == (access.offset() == invalidOffset));
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GetByIdVariant variant(access.identifier(), StructureSet(structure), complexGetStatus.offset(),
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complexGetStatus.conditionSet(), WTFMove(callLinkStatus),
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intrinsicFunction,
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customAccessorGetter,
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WTFMove(domAttribute));
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if (!result.appendVariant(variant))
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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if (haveDOMAttribute) {
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// Give up when custom accesses are not merged into one.
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if (result.numVariants() != 1)
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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} else {
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// Give up when custom access and simple access are mixed.
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if (result.m_state == Custom)
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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}
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break;
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} }
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}
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return result;
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}
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default:
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return GetByStatus(JSC::slowVersion(summary), *stubInfo);
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}
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RELEASE_ASSERT_NOT_REACHED();
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return GetByStatus();
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}
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GetByStatus GetByStatus::computeFor(
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CodeBlock* profiledBlock, ICStatusMap& baselineMap,
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ICStatusContextStack& icContextStack, CodeOrigin codeOrigin)
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{
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BytecodeIndex bytecodeIndex = codeOrigin.bytecodeIndex();
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CallLinkStatus::ExitSiteData callExitSiteData = CallLinkStatus::computeExitSiteData(profiledBlock, bytecodeIndex);
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ExitFlag didExit = hasBadCacheExitSite(profiledBlock, bytecodeIndex);
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for (ICStatusContext* context : icContextStack) {
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ICStatus status = context->get(codeOrigin);
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auto bless = [&] (const GetByStatus& result) -> GetByStatus {
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if (!context->isInlined(codeOrigin)) {
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// Merge with baseline result, which also happens to contain exit data for both
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// inlined and not-inlined.
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GetByStatus baselineResult = computeFor(
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profiledBlock, baselineMap, bytecodeIndex, didExit,
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callExitSiteData);
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baselineResult.merge(result);
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return baselineResult;
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}
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if (didExit.isSet(ExitFromInlined))
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return result.slowVersion();
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return result;
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};
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if (status.stubInfo) {
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GetByStatus result;
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{
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ConcurrentJSLocker locker(context->optimizedCodeBlock->m_lock);
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result = computeForStubInfoWithoutExitSiteFeedback(
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locker, context->optimizedCodeBlock, status.stubInfo, callExitSiteData);
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}
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if (result.isSet())
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return bless(result);
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}
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if (status.getStatus)
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return bless(*status.getStatus);
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}
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return computeFor(profiledBlock, baselineMap, bytecodeIndex, didExit, callExitSiteData);
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}
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GetByStatus GetByStatus::computeFor(const StructureSet& set, UniquedStringImpl* uid)
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{
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// For now we only handle the super simple self access case. We could handle the
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// prototype case in the future.
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//
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// Note that this code is also used for GetByIdDirect since this function only looks
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// into direct properties. When supporting prototype chains, we should split this for
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// GetById and GetByIdDirect.
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if (set.isEmpty())
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return GetByStatus();
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if (parseIndex(*uid))
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return GetByStatus(LikelyTakesSlowPath);
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GetByStatus result;
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result.m_state = Simple;
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result.m_wasSeenInJIT = false;
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for (unsigned i = 0; i < set.size(); ++i) {
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Structure* structure = set[i];
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if (structure->typeInfo().overridesGetOwnPropertySlot() && structure->typeInfo().type() != GlobalObjectType)
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return GetByStatus(LikelyTakesSlowPath);
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if (!structure->propertyAccessesAreCacheable())
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return GetByStatus(LikelyTakesSlowPath);
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unsigned attributes;
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PropertyOffset offset = structure->getConcurrently(uid, attributes);
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if (!isValidOffset(offset))
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return GetByStatus(LikelyTakesSlowPath); // It's probably a prototype lookup. Give up on life for now, even though we could totally be way smarter about it.
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if (attributes & PropertyAttribute::Accessor)
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return GetByStatus(MakesCalls); // We could be smarter here, like strength-reducing this to a Call.
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if (attributes & PropertyAttribute::CustomAccessorOrValue)
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return GetByStatus(LikelyTakesSlowPath);
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if (!result.appendVariant(GetByIdVariant(nullptr, structure, offset)))
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return GetByStatus(LikelyTakesSlowPath);
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}
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return result;
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}
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#endif // ENABLE(JIT)
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bool GetByStatus::makesCalls() const
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{
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switch (m_state) {
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case NoInformation:
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case LikelyTakesSlowPath:
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case ObservedTakesSlowPath:
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case Custom:
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case ModuleNamespace:
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return false;
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case Simple:
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for (unsigned i = m_variants.size(); i--;) {
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if (m_variants[i].callLinkStatus())
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return true;
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}
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return false;
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case MakesCalls:
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case ObservedSlowPathAndMakesCalls:
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return true;
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}
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RELEASE_ASSERT_NOT_REACHED();
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return false;
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}
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GetByStatus GetByStatus::slowVersion() const
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{
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if (observedStructureStubInfoSlowPath())
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return GetByStatus(makesCalls() ? ObservedSlowPathAndMakesCalls : ObservedTakesSlowPath, wasSeenInJIT());
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return GetByStatus(makesCalls() ? MakesCalls : LikelyTakesSlowPath, wasSeenInJIT());
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}
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void GetByStatus::merge(const GetByStatus& other)
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{
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if (other.m_state == NoInformation)
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return;
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auto mergeSlow = [&] () {
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if (observedStructureStubInfoSlowPath() || other.observedStructureStubInfoSlowPath())
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*this = GetByStatus((makesCalls() || other.makesCalls()) ? ObservedSlowPathAndMakesCalls : ObservedTakesSlowPath);
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else
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*this = GetByStatus((makesCalls() || other.makesCalls()) ? MakesCalls : LikelyTakesSlowPath);
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};
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switch (m_state) {
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case NoInformation:
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*this = other;
|
|
return;
|
|
|
|
case Simple:
|
|
case Custom:
|
|
if (m_state != other.m_state)
|
|
return mergeSlow();
|
|
|
|
for (const GetByIdVariant& otherVariant : other.m_variants) {
|
|
if (!appendVariant(otherVariant))
|
|
return mergeSlow();
|
|
}
|
|
return;
|
|
|
|
case ModuleNamespace:
|
|
if (other.m_state != ModuleNamespace)
|
|
return mergeSlow();
|
|
|
|
if (m_moduleNamespaceData->m_moduleNamespaceObject != other.m_moduleNamespaceData->m_moduleNamespaceObject)
|
|
return mergeSlow();
|
|
|
|
if (m_moduleNamespaceData->m_moduleEnvironment != other.m_moduleNamespaceData->m_moduleEnvironment)
|
|
return mergeSlow();
|
|
|
|
if (m_moduleNamespaceData->m_scopeOffset != other.m_moduleNamespaceData->m_scopeOffset)
|
|
return mergeSlow();
|
|
|
|
return;
|
|
|
|
case LikelyTakesSlowPath:
|
|
case ObservedTakesSlowPath:
|
|
case MakesCalls:
|
|
case ObservedSlowPathAndMakesCalls:
|
|
return mergeSlow();
|
|
}
|
|
|
|
RELEASE_ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
void GetByStatus::filter(const StructureSet& set)
|
|
{
|
|
if (m_state != Simple)
|
|
return;
|
|
filterICStatusVariants(m_variants, set);
|
|
if (m_variants.isEmpty())
|
|
m_state = NoInformation;
|
|
}
|
|
|
|
void GetByStatus::visitAggregate(SlotVisitor& visitor)
|
|
{
|
|
if (isModuleNamespace())
|
|
m_moduleNamespaceData->m_identifier.visitAggregate(visitor);
|
|
for (GetByIdVariant& variant : m_variants)
|
|
variant.visitAggregate(visitor);
|
|
}
|
|
|
|
void GetByStatus::markIfCheap(SlotVisitor& visitor)
|
|
{
|
|
for (GetByIdVariant& variant : m_variants)
|
|
variant.markIfCheap(visitor);
|
|
}
|
|
|
|
bool GetByStatus::finalize(VM& vm)
|
|
{
|
|
for (GetByIdVariant& variant : m_variants) {
|
|
if (!variant.finalize(vm))
|
|
return false;
|
|
}
|
|
if (isModuleNamespace()) {
|
|
if (m_moduleNamespaceData->m_moduleNamespaceObject && !vm.heap.isMarked(m_moduleNamespaceData->m_moduleNamespaceObject))
|
|
return false;
|
|
if (m_moduleNamespaceData->m_moduleEnvironment && !vm.heap.isMarked(m_moduleNamespaceData->m_moduleEnvironment))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
CacheableIdentifier GetByStatus::singleIdentifier() const
|
|
{
|
|
if (isModuleNamespace())
|
|
return m_moduleNamespaceData->m_identifier;
|
|
|
|
if (m_variants.isEmpty())
|
|
return nullptr;
|
|
|
|
CacheableIdentifier result = m_variants.first().identifier();
|
|
if (!result)
|
|
return nullptr;
|
|
for (size_t i = 1; i < m_variants.size(); ++i) {
|
|
CacheableIdentifier identifier = m_variants[i].identifier();
|
|
if (!identifier)
|
|
return nullptr;
|
|
if (identifier != result)
|
|
return nullptr;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void GetByStatus::dump(PrintStream& out) const
|
|
{
|
|
out.print("(");
|
|
switch (m_state) {
|
|
case NoInformation:
|
|
out.print("NoInformation");
|
|
break;
|
|
case Simple:
|
|
out.print("Simple");
|
|
break;
|
|
case Custom:
|
|
out.print("Custom");
|
|
break;
|
|
case ModuleNamespace:
|
|
out.print("ModuleNamespace");
|
|
break;
|
|
case LikelyTakesSlowPath:
|
|
out.print("LikelyTakesSlowPath");
|
|
break;
|
|
case ObservedTakesSlowPath:
|
|
out.print("ObservedTakesSlowPath");
|
|
break;
|
|
case MakesCalls:
|
|
out.print("MakesCalls");
|
|
break;
|
|
case ObservedSlowPathAndMakesCalls:
|
|
out.print("ObservedSlowPathAndMakesCalls");
|
|
break;
|
|
}
|
|
out.print(", ", listDump(m_variants), ", seenInJIT = ", m_wasSeenInJIT, ")");
|
|
}
|
|
|
|
} // namespace JSC
|
|
|