Ignore:
Timestamp:
Oct 31, 2019, 3:32:52 PM (6 years ago)
Author:
Tadeu Zagallo
Message:

[WebAssembly] Create a Wasm interpreter
​https://bugs.webkit.org/show_bug.cgi?id=194257
<rdar://problem/44186794>

Reviewed by Saam Barati.

Source/JavaScriptCore:

Add an interpreter tier to WebAssembly which reuses the LLInt infrastructure. The interpreter
currently tiers up straight to OMG and can OSR enter at the prologue and from loops. The initial
implementation of the interpreter is very naive, but despite the lack of optimizations it still
shows a 2x improvement on the WebAssembly subtests in JetStream2 and 2x improvement on the
PSPDFKit benchmark. It reduces "compilation" times by ~3x and it's neutral on throughput.

The interpreter follows the same calling conventions as the BBQ/OMG, this means that:

  • We have to allocate locals for all argument registers and write all arguments registers to the stack in the prologue.
  • Calls have to allocate space for at least as many arguments as the number of argument registers. Before each call, all argument registers must be loaded from the stack, and after we return from the call, all registers must be stored back to the stack, in case they contain return values. We carefully layout the stack so that the arguments that would already have to be passed in the stack end up in the right place. The stack layout for calls is:

[ gprs ][ fprs ][ optional stack arguments ][ callee frame ]

sp

  • The return opcode has to load all registers from the stack, since they might need to contain results of the function.
  • The calling convention requires that the callee should store itself in the callee slot of the call frame, which is impossible in the interpreter, since the code we execute is the same for all callees. In order to work around that, we generate an entry thunk to the wasm interpreter for each function. All this thunk does is store the callee in the call frame and tail call the interpreter.
  • CMakeLists.txt:
  • DerivedSources-input.xcfilelist:
  • DerivedSources-output.xcfilelist:
  • DerivedSources.make:
  • JavaScriptCore.xcodeproj/project.pbxproj:
  • Sources.txt:
  • bytecode/BytecodeDumper.cpp:

(JSC::BytecodeDumper<Block>::constantName const):
(JSC::BytecodeDumper<Block>::dumpValue):
(JSC::BytecodeDumper<Block>::dumpBytecode):
(JSC::CodeBlockBytecodeDumper<Block>::vm const):
(JSC::CodeBlockBytecodeDumper<Block>::identifier const):
(JSC::CodeBlockBytecodeDumper<Block>::dumpIdentifiers):
(JSC::CodeBlockBytecodeDumper<Block>::dumpConstants):
(JSC::CodeBlockBytecodeDumper<Block>::dumpExceptionHandlers):
(JSC::CodeBlockBytecodeDumper<Block>::dumpSwitchJumpTables):
(JSC::CodeBlockBytecodeDumper<Block>::dumpStringSwitchJumpTables):
(JSC::CodeBlockBytecodeDumper<Block>::dumpBlock):

  • bytecode/BytecodeDumper.h:

(JSC::BytecodeDumper::dumpValue):
(JSC::BytecodeDumper::BytecodeDumper):

  • bytecode/BytecodeGeneratorification.cpp:

(JSC::performGeneratorification):

  • bytecode/BytecodeList.rb:
  • bytecode/CodeBlock.cpp:

(JSC::CodeBlock::dumpBytecode):

  • bytecode/Fits.h:
  • bytecode/Instruction.h:

(JSC::BaseInstruction::BaseInstruction):
(JSC::BaseInstruction::Impl::opcodeID const):
(JSC::BaseInstruction::opcodeID const):
(JSC::BaseInstruction::name const):
(JSC::BaseInstruction::isWide16 const):
(JSC::BaseInstruction::isWide32 const):
(JSC::BaseInstruction::hasMetadata const):
(JSC::BaseInstruction::sizeShiftAmount const):
(JSC::BaseInstruction::size const):
(JSC::BaseInstruction::is const):
(JSC::BaseInstruction::as const):
(JSC::BaseInstruction::cast):
(JSC::BaseInstruction::cast const):
(JSC::BaseInstruction::wide16 const):
(JSC::BaseInstruction::wide32 const):

  • bytecode/InstructionStream.h:

(JSC::InstructionStream::iterator::operator+=):
(JSC::InstructionStream::iterator::operator++):
(JSC::InstructionStreamWriter::iterator::operator+=):
(JSC::InstructionStreamWriter::iterator::operator++):

  • bytecode/Opcode.cpp:
  • bytecode/Opcode.h:
  • bytecode/PreciseJumpTargetsInlines.h:
  • bytecode/UnlinkedCodeBlock.h:
  • bytecode/VirtualRegister.cpp:

(JSC::VirtualRegister::VirtualRegister):

  • bytecode/VirtualRegister.h:
  • bytecompiler/BytecodeGenerator.cpp:

(JSC::GenericLabel<JSGeneratorTraits>::setLocation):
(JSC::BytecodeGenerator::BytecodeGenerator):

  • bytecompiler/BytecodeGenerator.h:
  • bytecompiler/BytecodeGeneratorBase.h: Added.
  • bytecompiler/BytecodeGeneratorBaseInlines.h: Added.

(JSC::shrinkToFit):
(JSC::BytecodeGeneratorBase<Traits>::BytecodeGeneratorBase):
(JSC::BytecodeGeneratorBase<Traits>::newLabel):
(JSC::BytecodeGeneratorBase<Traits>::newEmittedLabel):
(JSC::BytecodeGeneratorBase<Traits>::reclaimFreeRegisters):
(JSC::BytecodeGeneratorBase<Traits>::emitLabel):
(JSC::BytecodeGeneratorBase<Traits>::recordOpcode):
(JSC::BytecodeGeneratorBase<Traits>::alignWideOpcode16):
(JSC::BytecodeGeneratorBase<Traits>::alignWideOpcode32):
(JSC::BytecodeGeneratorBase<Traits>::write):
(JSC::BytecodeGeneratorBase<Traits>::newRegister):
(JSC::BytecodeGeneratorBase<Traits>::newTemporary):
(JSC::BytecodeGeneratorBase<Traits>::addVar):
(JSC::BytecodeGeneratorBase<Traits>::allocateCalleeSaveSpace):

  • bytecompiler/Label.h:

(JSC::GenericBoundLabel::GenericBoundLabel):
(JSC::GenericBoundLabel::target):
(JSC::GenericBoundLabel::saveTarget):
(JSC::GenericBoundLabel::commitTarget):

  • dfg/DFGByteCodeParser.cpp:
  • dfg/DFGCapabilities.cpp:

(JSC::DFG::capabilityLevel):

  • dfg/DFGOperations.cpp:
  • generator/Argument.rb:
  • generator/DSL.rb:
  • generator/GeneratedFile.rb:
  • generator/Opcode.rb:
  • generator/Options.rb:
  • generator/Section.rb:
  • generator/Wasm.rb: Added.
  • interpreter/Register.h:
  • interpreter/RegisterInlines.h:

(JSC::Register::operator=):

  • jit/JITArithmetic.cpp:
  • jit/JITOpcodes.cpp:
  • llint/LLIntData.cpp:

(JSC::LLInt::initialize):

  • llint/LLIntData.h:

(JSC::LLInt::wasmExceptionInstructions):

  • llint/LLIntOfflineAsmConfig.h:
  • llint/LLIntOffsetsExtractor.cpp:
  • llint/LLIntSlowPaths.cpp:
  • llint/LLIntThunks.cpp:

(JSC::LLInt::generateThunkWithJumpTo):
(JSC::LLInt::wasmFunctionEntryThunk):

  • llint/LLIntThunks.h:
  • llint/LowLevelInterpreter.asm:
  • llint/LowLevelInterpreter32_64.asm:
  • llint/LowLevelInterpreter64.asm:
  • llint/WebAssembly.asm: Added.
  • offlineasm/arm64.rb:
  • offlineasm/instructions.rb:
  • offlineasm/parser.rb:
  • offlineasm/registers.rb:
  • offlineasm/transform.rb:
  • offlineasm/x86.rb:
  • parser/Nodes.h:
  • runtime/Error.cpp:

(JSC::FindFirstCallerFrameWithCodeblockFunctor::operator() const):

  • runtime/ErrorInstance.cpp:

(JSC::ErrorInstance::finishCreation):

  • runtime/Options.cpp:

(JSC::overrideDefaults):

  • runtime/OptionsList.h:
  • runtime/SamplingProfiler.cpp:

(JSC::FrameWalker::recordJITFrame):
(JSC::FrameWalker::resetAtMachineFrame):

  • wasm/WasmAirIRGenerator.cpp:

(JSC::Wasm::AirIRGenerator::isControlTypeIf):
(JSC::Wasm::AirIRGenerator::emitLoopTierUpCheck):

  • wasm/WasmB3IRGenerator.cpp:

(JSC::Wasm::B3IRGenerator::isControlTypeIf):

  • wasm/WasmBBQPlan.cpp:

(JSC::Wasm::BBQPlan::prepareImpl):
(JSC::Wasm::BBQPlan::work):
(JSC::Wasm::BBQPlan::compileFunction):
(JSC::Wasm::BBQPlan::didCompleteCompilation):
(JSC::Wasm::BBQPlan::initializeCallees):

  • wasm/WasmBBQPlan.h:
  • wasm/WasmBBQPlanInlines.h: Removed.
  • wasm/WasmCallee.cpp:

(JSC::Wasm::Callee::Callee):
(JSC::Wasm::Callee::dump const):
(JSC::Wasm::JITCallee::JITCallee):
(JSC::Wasm::LLIntCallee::setEntrypoint):
(JSC::Wasm::LLIntCallee::entrypoint const):
(JSC::Wasm::LLIntCallee::calleeSaveRegisters):
(JSC::Wasm:: const):

  • wasm/WasmCallee.h:

(JSC::Wasm::Callee::setOSREntryCallee):
(JSC::Wasm::JITCallee::wasmToWasmCallsites):
(JSC::Wasm::JITCallee:: const):

  • wasm/WasmCallingConvention.h:
  • wasm/WasmCodeBlock.cpp:

(JSC::Wasm::CodeBlock::CodeBlock):

  • wasm/WasmCodeBlock.h:

(JSC::Wasm::CodeBlock::wasmEntrypointCalleeFromFunctionIndexSpace):
(JSC::Wasm::CodeBlock::wasmBBQCalleeFromFunctionIndexSpace):
(JSC::Wasm::CodeBlock::wasmToWasmExitStub):

  • wasm/WasmCompilationMode.cpp:

(JSC::Wasm::makeString):

  • wasm/WasmCompilationMode.h:
  • wasm/WasmEmbedder.h:
  • wasm/WasmEntryPlan.cpp: Added.

(JSC::Wasm::EntryPlan::EntryPlan):
(JSC::Wasm::EntryPlan::stateString):
(JSC::Wasm::EntryPlan::moveToState):
(JSC::Wasm::EntryPlan::didReceiveFunctionData):
(JSC::Wasm::EntryPlan::parseAndValidateModule):
(JSC::Wasm::EntryPlan::prepare):
(JSC::Wasm::EntryPlan::ThreadCountHolder::ThreadCountHolder):
(JSC::Wasm::EntryPlan::ThreadCountHolder::~ThreadCountHolder):
(JSC::Wasm::EntryPlan::complete):
(JSC::Wasm::EntryPlan::compileFunctions):
(JSC::Wasm::EntryPlan::work):

  • wasm/WasmEntryPlan.h: Copied from Source/JavaScriptCore/wasm/WasmBBQPlan.h.

(JSC::Wasm::EntryPlan::parseAndValidateModule):
(JSC::Wasm::EntryPlan::exports const):
(JSC::Wasm::EntryPlan::internalFunctionCount const):
(JSC::Wasm::EntryPlan::takeModuleInformation):
(JSC::Wasm::EntryPlan::takeWasmToWasmExitStubs):
(JSC::Wasm::EntryPlan::takeWasmToWasmCallsites):
(JSC::Wasm::EntryPlan::hasBeenPrepared const):
(JSC::Wasm::EntryPlan::tryReserveCapacity):

  • wasm/WasmFunctionCodeBlock.cpp: Added.

(JSC::Wasm::FunctionCodeBlock::setInstructions):
(JSC::Wasm::FunctionCodeBlock::dumpBytecode):
(JSC::Wasm::FunctionCodeBlock::addOutOfLineJumpTarget):
(JSC::Wasm::FunctionCodeBlock::outOfLineJumpOffset):
(JSC::Wasm::FunctionCodeBlock::outOfLineJumpTarget):
(JSC::Wasm::FunctionCodeBlock::addSignature):
(JSC::Wasm::FunctionCodeBlock::signature const):
(JSC::Wasm::FunctionCodeBlock::addJumpTable):
(JSC::Wasm::FunctionCodeBlock::jumpTable const const):
(JSC::Wasm::FunctionCodeBlock::numberOfJumpTables const):

  • wasm/WasmFunctionCodeBlock.h: Added.

(JSC::Wasm::FunctionCodeBlock::FunctionCodeBlock):
(JSC::Wasm::FunctionCodeBlock::getConstant const):
(JSC::Wasm::FunctionCodeBlock::functionIndex const):
(JSC::Wasm::FunctionCodeBlock::addJumpTarget):
(JSC::Wasm::FunctionCodeBlock::numberOfJumpTargets):
(JSC::Wasm::FunctionCodeBlock::lastJumpTarget):
(JSC::Wasm::FunctionCodeBlock::outOfLineJumpOffset):
(JSC::Wasm::FunctionCodeBlock::bytecodeOffset):
(JSC::Wasm::FunctionCodeBlock::tierUpCounter):

  • wasm/WasmFunctionParser.h:

(JSC::Wasm::FunctionParser<Context>::parseExpression):
(JSC::Wasm::FunctionParser<Context>::parseUnreachableExpression):

  • wasm/WasmInstance.h:
  • wasm/WasmLLIntGenerator.cpp: Added.

(JSC::Wasm::LLIntGenerator::ControlType::ControlType):
(JSC::Wasm::LLIntGenerator::ControlType::loop):
(JSC::Wasm::LLIntGenerator::ControlType::topLevel):
(JSC::Wasm::LLIntGenerator::ControlType::block):
(JSC::Wasm::LLIntGenerator::ControlType::if_):
(JSC::Wasm::LLIntGenerator::ControlType::targetLabelForBranch const):
(JSC::Wasm::LLIntGenerator::fail const):
(JSC::Wasm::LLIntGenerator::unifyValuesWithBlock):
(JSC::Wasm::LLIntGenerator::emptyExpression):
(JSC::Wasm::LLIntGenerator::createStack):
(JSC::Wasm::LLIntGenerator::isControlTypeIf):
(JSC::Wasm::LLIntGenerator::addEndToUnreachable):
(JSC::Wasm::LLIntGenerator::setParser):
(JSC::Wasm::LLIntGenerator::dump):
(JSC::Wasm::LLIntGenerator::virtualRegisterForLocal):
(JSC::Wasm::LLIntGenerator::tmpsForSignature):
(JSC::Wasm::LLIntGenerator::jsNullConstant):
(JSC::Wasm::LLIntGenerator::isConstant):
(JSC::Wasm::parseAndCompileBytecode):
(JSC::Wasm::LLIntGenerator::LLIntGenerator):
(JSC::Wasm::LLIntGenerator::finalize):
(JSC::Wasm::LLIntGenerator::callInformationFor):
(JSC::Wasm::LLIntGenerator::addArguments):
(JSC::Wasm::LLIntGenerator::addLocal):
(JSC::Wasm::LLIntGenerator::addConstant):
(JSC::Wasm::LLIntGenerator::getLocal):
(JSC::Wasm::LLIntGenerator::setLocal):
(JSC::Wasm::LLIntGenerator::getGlobal):
(JSC::Wasm::LLIntGenerator::setGlobal):
(JSC::Wasm::LLIntGenerator::addLoop):
(JSC::Wasm::LLIntGenerator::addTopLevel):
(JSC::Wasm::LLIntGenerator::addBlock):
(JSC::Wasm::LLIntGenerator::addIf):
(JSC::Wasm::LLIntGenerator::addElse):
(JSC::Wasm::LLIntGenerator::addElseToUnreachable):
(JSC::Wasm::LLIntGenerator::addReturn):
(JSC::Wasm::LLIntGenerator::addBranch):
(JSC::Wasm::LLIntGenerator::addSwitch):
(JSC::Wasm::LLIntGenerator::endBlock):
(JSC::Wasm::LLIntGenerator::addCall):
(JSC::Wasm::LLIntGenerator::addCallIndirect):
(JSC::Wasm::LLIntGenerator::addRefIsNull):
(JSC::Wasm::LLIntGenerator::addRefFunc):
(JSC::Wasm::LLIntGenerator::addTableGet):
(JSC::Wasm::LLIntGenerator::addTableSet):
(JSC::Wasm::LLIntGenerator::addTableSize):
(JSC::Wasm::LLIntGenerator::addTableGrow):
(JSC::Wasm::LLIntGenerator::addTableFill):
(JSC::Wasm::LLIntGenerator::addUnreachable):
(JSC::Wasm::LLIntGenerator::addCurrentMemory):
(JSC::Wasm::LLIntGenerator::addGrowMemory):
(JSC::Wasm::LLIntGenerator::addSelect):
(JSC::Wasm::LLIntGenerator::load):
(JSC::Wasm::LLIntGenerator::store):
(JSC::GenericLabel<Wasm::GeneratorTraits>::setLocation):

  • wasm/WasmLLIntGenerator.h: Copied from Source/JavaScriptCore/wasm/WasmCompilationMode.h.
  • wasm/WasmLLIntPlan.cpp: Added.

(JSC::Wasm::LLIntPlan::prepareImpl):
(JSC::Wasm::LLIntPlan::compileFunction):
(JSC::Wasm::LLIntPlan::didCompleteCompilation):
(JSC::Wasm::LLIntPlan::initializeCallees):

  • wasm/WasmLLIntPlan.h: Copied from Source/JavaScriptCore/wasm/WasmOMGForOSREntryPlan.h.
  • wasm/WasmLLIntTierUpCounter.cpp: Copied from Source/JavaScriptCore/wasm/WasmCompilationMode.cpp.

(JSC::Wasm::LLIntTierUpCounter::addOSREntryDataForLoop):
(JSC::Wasm::LLIntTierUpCounter::osrEntryDataForLoop const const):

  • wasm/WasmLLIntTierUpCounter.h: Copied from Source/JavaScriptCore/wasm/WasmOMGForOSREntryPlan.h.

(JSC::Wasm::LLIntTierUpCounter::LLIntTierUpCounter):
(JSC::Wasm::LLIntTierUpCounter::optimizeAfterWarmUp):
(JSC::Wasm::LLIntTierUpCounter::checkIfOptimizationThresholdReached):
(JSC::Wasm::LLIntTierUpCounter::optimizeSoon):

  • wasm/WasmMemoryInformation.cpp:

(JSC::Wasm::PinnedRegisterInfo::get):

  • wasm/WasmModule.cpp:

(JSC::Wasm::makeValidationResult):
(JSC::Wasm::makeValidationCallback):
(JSC::Wasm::Module::validateSync):
(JSC::Wasm::Module::validateAsync):

  • wasm/WasmOMGForOSREntryPlan.cpp:

(JSC::Wasm::OMGForOSREntryPlan::OMGForOSREntryPlan):
(JSC::Wasm::OMGForOSREntryPlan::work):

  • wasm/WasmOMGForOSREntryPlan.h:
  • wasm/WasmOMGPlan.cpp:

(JSC::Wasm::OMGPlan::work):

  • wasm/WasmSlowPaths.cpp: Added.

(JSC::LLInt::jitCompileAndSetHeuristics):
(JSC::LLInt::WASM_SLOW_PATH_DECL):
(JSC::LLInt::doWasmCall):
(JSC::LLInt::doWasmCallIndirect):
(JSC::LLInt::slow_path_wasm_throw_exception):
(JSC::LLInt::slow_path_wasm_popcount):
(JSC::LLInt::slow_path_wasm_popcountll):

  • wasm/WasmSlowPaths.h: Added.
  • wasm/WasmTable.cpp:

(JSC::Wasm::FuncRefTable::function const):
(JSC::Wasm::FuncRefTable::instance const):

  • wasm/WasmTable.h:
  • wasm/WasmTierUpCount.h:
  • wasm/WasmValidate.cpp:

(JSC::Wasm::Validate::isControlTypeIf):

  • wasm/js/JSToWasm.cpp:

(JSC::Wasm::createJSToWasmWrapper):

  • wasm/js/JSToWasm.h:
  • wasm/js/WebAssemblyFunction.cpp:

(JSC::WebAssemblyFunction::calleeSaves const):

Tools:

Add a mode that runs WebAssembly tests without the LLInt (i.e. only Air)
and update the no-air mode to also disable the LLInt tier.

  • Scripts/run-jsc-stress-tests:
File:
1 edited

Legend:

Unmodified
Added
Removed

  • trunk/Source/JavaScriptCore/bytecompiler/Label.h

    r250005 r251886  
    2929#pragma once
    3030
    31 #include "Instruction.h"
    3231#include <wtf/Assertions.h>
    3332#include <wtf/Vector.h>
    … …  
    3534
    3635namespace JSC {
    37     class BytecodeGenerator;
    38     class Label;
     36    template<typename Traits>
     37    class BytecodeGeneratorBase;
     38    struct JSGeneratorTraits;
    3939
    40     class BoundLabel {
     40    template<typename Traits>
     41    class GenericLabel;
     42
     43    template<typename Traits>
     44    class GenericBoundLabel {
     45        using BytecodeGenerator = BytecodeGeneratorBase<Traits>;
     46        using Label = GenericLabel<Traits>;
     47
    4148    public:
    42         BoundLabel()
     49        GenericBoundLabel()
    4350            : m_type(Offset)
    4451            , m_generator(nullptr)
    … …  
    4653        { }
    4754
    48         explicit BoundLabel(int target)
     55        explicit GenericBoundLabel(int target)
    4956            : m_type(Offset)
    5057            , m_generator(nullptr)
    … …  
    5259        { }
    5360
    54         BoundLabel(BytecodeGenerator* generator, Label* label)
     61        GenericBoundLabel(BytecodeGenerator* generator, Label* label)
    5562            : m_type(GeneratorForward)
    5663            , m_generator(generator)
    … …  
    5865        { }
    5966
    60         BoundLabel(BytecodeGenerator* generator, int offset)
     67        GenericBoundLabel(BytecodeGenerator* generator, int offset)
    6168            : m_type(GeneratorBackward)
    6269            , m_generator(generator)
    … …  
    6471        { }
    6572
    66         int target();
    67         int saveTarget();
    68         int commitTarget();
     73        int target()
     74        {
     75            switch (m_type) {
     76            case Offset:
     77                return m_target;
     78            case GeneratorBackward:
     79                return m_target - m_generator->m_writer.position();
     80            case GeneratorForward:
     81                return 0;
     82            default:
     83                RELEASE_ASSERT_NOT_REACHED();
     84            }
     85        }
     86
     87        int saveTarget()
     88        {
     89            if (m_type == GeneratorForward) {
     90                m_savedTarget = m_generator->m_writer.position();
     91                return 0;
     92            }
     93
     94            m_savedTarget = target();
     95            return m_savedTarget;
     96        }
     97
     98        int commitTarget()
     99        {
     100            if (m_type == GeneratorForward) {
     101                m_label->m_unresolvedJumps.append(m_savedTarget);
     102                return 0;
     103            }
     104
     105            return m_savedTarget;
     106        }
    69107
    70108        operator int() { return target(); }
    … …  
    86124    };
    87125
    88     class Label {
    89     WTF_MAKE_NONCOPYABLE(Label);
     126    template<typename Traits>
     127    class GenericLabel {
     128        WTF_MAKE_NONCOPYABLE(GenericLabel);
     129        using BytecodeGenerator = BytecodeGeneratorBase<Traits>;
     130        using BoundLabel = GenericBoundLabel<Traits>;
     131
    90132    public:
    91         Label() = default;
     133        GenericLabel() = default;
    92134
    93         void setLocation(BytecodeGenerator&, unsigned);
     135        void setLocation(BytecodeGenerator&, unsigned location);
    94136
    95137        BoundLabel bind(BytecodeGenerator* generator)
    … …  
    130172
    131173    private:
    132         friend class BoundLabel;
     174        friend BoundLabel;
    133175
    134176        typedef Vector<int, 8> JumpVector;
    … …  
    142184    };
    143185
     186    using Label = GenericLabel<JSGeneratorTraits>;
     187    using BoundLabel = GenericBoundLabel<JSGeneratorTraits>;
     188
     189    namespace Wasm {
     190    struct GeneratorTraits;
     191    using Label = GenericLabel<Wasm::GeneratorTraits>;
     192    }
     193
     194    // This cannot be declared in the Wasm namespace as it conflicts with the
     195    // ruby Wasm namespace when referencing it from BytecodeList.rb
     196    using WasmBoundLabel = GenericBoundLabel<Wasm::GeneratorTraits>;
     197
    144198} // namespace JSC
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