Ignore:
Timestamp:
May 27, 2016, 10:44:10 PM (9 years ago)
Author:
[email protected]
Message:

[JSC] implement async functions proposal
​https://bugs.webkit.org/show_bug.cgi?id=156147

Reviewed by Yusuke Suzuki.

Source/JavaScriptCore:

Adds support for async functions, proposed in ​https://tc39.github.io/ecmascript-asyncawait/.

On the front-end side, "await" becomes a contextual keyword when used within an async function,
which triggers parsing an AwaitExpression. "await" becomes an illegal identifier name within
these contexts. The bytecode generated from an "await" expression is identical to that generated
in a "yield" expression in a Generator, as AsyncFunction reuses generator's state machine mechanism.

There are numerous syntactic forms for language features, including a variation on ArrowFunctions,
requiring the keyword async to precede ArrowFormalParameters, and similarly, MethodDefinitions,
which are ordinary MethodDefinitions preceded by the keyword async.

An async function desugars to the following:

`
async function asyncFn() {
}

becomes:

function asyncFn() {

let generator = {

@generatorNext: function(@generator, @generatorState, @generatorValue, @generatorResumeMode) {

generator state machine stuff here

},
@generatorState: 0,
@generatorThis: this,
@generatorFrame: null

};
return @asyncFunctionResume(generator, undefined, GeneratorResumeMode::NormalMode);

}
`

@asyncFunctionResume() is similar to @generatorResume, with the exception that it will wrap the
result of invoking @generatorNext() in a Promise, and will avoid allocating an iterator result
object.

If the generator has yielded (an AwaitExpression has occurred), resumption will occur automatically
once the await-expression operand is finished, via Promise chaining.

  • API/JSScriptRef.cpp:

(parseScript):

  • CMakeLists.txt:
  • DerivedSources.make:
  • JavaScriptCore.xcodeproj/project.pbxproj:
  • builtins/AsyncFunctionPrototype.js: Added.

(asyncFunctionResume):

  • builtins/BuiltinExecutables.cpp:

(JSC::BuiltinExecutables::createExecutable):

  • bytecode/BytecodeList.json:
  • bytecode/BytecodeUseDef.h:

(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):

  • bytecode/CodeBlock.cpp:

(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::finishCreation):

  • bytecode/UnlinkedCodeBlock.h:

(JSC::UnlinkedCodeBlock::isArrowFunction):
(JSC::UnlinkedCodeBlock::isOrdinaryArrowFunction):
(JSC::UnlinkedCodeBlock::isAsyncArrowFunction):

  • bytecode/UnlinkedFunctionExecutable.cpp:

(JSC::generateUnlinkedFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::fromGlobalCode):
(JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor):

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

(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::emitNewFunctionExpressionCommon):
(JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
(JSC::BytecodeGenerator::emitNewMethodDefinition):
(JSC::BytecodeGenerator::emitNewFunction):
(JSC::BytecodeGenerator::emitLoadArrowFunctionLexicalEnvironment):

  • bytecompiler/BytecodeGenerator.h:

(JSC::BytecodeGenerator::makeFunction):

  • bytecompiler/NodesCodegen.cpp:

(JSC::FunctionNode::emitBytecode):

  • inspector/agents/InspectorRuntimeAgent.cpp:

(Inspector::InspectorRuntimeAgent::parse):

  • jit/JIT.cpp:

(JSC::JIT::privateCompileMainPass):

  • jit/JIT.h:
  • jit/JITOpcodes.cpp:

(JSC::JIT::emitNewFuncCommon):
(JSC::JIT::emit_op_new_async_func):
(JSC::JIT::emitNewFuncExprCommon):
(JSC::JIT::emit_op_new_async_func_exp):

  • jit/JITOperations.cpp:
  • jit/JITOperations.h:
  • jsc.cpp:

(runInteractive):
(printUsageStatement):

  • llint/LLIntSlowPaths.cpp:

(JSC::LLInt::LLINT_SLOW_PATH_DECL):

  • llint/LLIntSlowPaths.h:
  • llint/LowLevelInterpreter.asm:
  • parser/ASTBuilder.h:

(JSC::ASTBuilder::createAsyncFunctionBody):

  • parser/Keywords.table:
  • parser/Parser.cpp:

(JSC::Parser<LexerType>::Parser):
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::isArrowFunctionParameters):
(JSC::Parser<LexerType>::parseAsyncFunctionSourceElements):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionDeclarationStatement):
(JSC::Parser<LexerType>::parseFormalParameters):
(JSC::stringForFunctionMode):
(JSC::Parser<LexerType>::parseFunctionParameters):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseAsyncFunctionDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseImportClauseItem):
(JSC::Parser<LexerType>::parseImportDeclaration):
(JSC::Parser<LexerType>::parseExportDeclaration):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseAwaitExpression):
(JSC::Parser<LexerType>::parseProperty):
(JSC::Parser<LexerType>::parsePropertyMethod):
(JSC::Parser<LexerType>::parseAsyncFunctionExpression):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseMemberExpression):
(JSC::Parser<LexerType>::parseArrowFunctionExpression):
(JSC::Parser<LexerType>::parseUnaryExpression):
(JSC::Parser<LexerType>::printUnexpectedTokenText):

  • parser/Parser.h:

(JSC::isIdentifierOrKeyword):
(JSC::Scope::Scope):
(JSC::Scope::setSourceParseMode):
(JSC::Scope::isAsyncFunction):
(JSC::Scope::isAsyncFunctionBoundary):
(JSC::Scope::isModule):
(JSC::Scope::setIsFunction):
(JSC::Scope::setIsAsyncArrowFunction):
(JSC::Scope::setIsAsyncFunction):
(JSC::Scope::setIsAsyncFunctionBody):
(JSC::Scope::setIsAsyncArrowFunctionBody):
(JSC::Parser::ExpressionErrorClassifier::forceClassifyExpressionError):
(JSC::Parser::ExpressionErrorClassifier::propagateExpressionErrorClass):
(JSC::Parser::ExpressionErrorClassifier::indicatesPossibleAsyncArrowFunction):
(JSC::Parser::forceClassifyExpressionError):
(JSC::Parser::declarationTypeToVariableKind):
(JSC::Parser::closestParentOrdinaryFunctionNonLexicalScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::matchSpecIdentifier):
(JSC::Parser::isDisallowedIdentifierAwait):
(JSC::Parser::disallowedIdentifierAwaitReason):
(JSC::parse):

  • parser/ParserModes.h:

(JSC::isFunctionParseMode):
(JSC::isAsyncFunctionParseMode):
(JSC::isAsyncArrowFunctionParseMode):
(JSC::isAsyncFunctionWrapperParseMode):
(JSC::isAsyncFunctionBodyParseMode):
(JSC::isModuleParseMode):
(JSC::isProgramParseMode):
(JSC::constructAbilityForParseMode):

  • parser/ParserTokens.h:
  • parser/SourceCodeKey.h:

(JSC::SourceCodeKey::SourceCodeKey):
(JSC::SourceCodeKey::runtimeFlags):
(JSC::SourceCodeKey::operator==):

  • parser/SyntaxChecker.h:

(JSC::SyntaxChecker::createAsyncFunctionBody):

  • runtime/AsyncFunctionConstructor.cpp: Added.

(JSC::AsyncFunctionConstructor::AsyncFunctionConstructor):
(JSC::AsyncFunctionConstructor::finishCreation):
(JSC::callAsyncFunctionConstructor):
(JSC::constructAsyncFunctionConstructor):
(JSC::AsyncFunctionConstructor::getCallData):
(JSC::AsyncFunctionConstructor::getConstructData):

  • runtime/AsyncFunctionConstructor.h: Added.

(JSC::AsyncFunctionConstructor::create):
(JSC::AsyncFunctionConstructor::createStructure):

  • runtime/AsyncFunctionPrototype.cpp: Added.

(JSC::AsyncFunctionPrototype::AsyncFunctionPrototype):
(JSC::AsyncFunctionPrototype::finishCreation):

  • runtime/AsyncFunctionPrototype.h: Added.

(JSC::AsyncFunctionPrototype::create):
(JSC::AsyncFunctionPrototype::createStructure):

  • runtime/CodeCache.cpp:

(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getModuleProgramCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):

  • runtime/CodeCache.h:
  • runtime/CommonIdentifiers.h:
  • runtime/Completion.cpp:

(JSC::checkSyntax):
(JSC::checkModuleSyntax):

  • runtime/Completion.h:
  • runtime/Executable.cpp:

(JSC::ScriptExecutable::newCodeBlockFor):
(JSC::ProgramExecutable::checkSyntax):

  • runtime/Executable.h:
  • runtime/FunctionConstructor.cpp:

(JSC::constructFunctionSkippingEvalEnabledCheck):

  • runtime/FunctionConstructor.h:
  • runtime/JSAsyncFunction.cpp: Added.

(JSC::JSAsyncFunction::JSAsyncFunction):
(JSC::JSAsyncFunction::createImpl):
(JSC::JSAsyncFunction::create):
(JSC::JSAsyncFunction::createWithInvalidatedReallocationWatchpoint):

  • runtime/JSAsyncFunction.h: Added.

(JSC::JSAsyncFunction::allocationSize):
(JSC::JSAsyncFunction::createStructure):

  • runtime/JSFunction.cpp:

(JSC::JSFunction::getOwnPropertySlot):

  • runtime/JSGlobalObject.cpp:

(JSC::JSGlobalObject::init):
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
(JSC::JSGlobalObject::createModuleProgramCodeBlock):

  • runtime/JSGlobalObject.h:

(JSC::JSGlobalObject::asyncFunctionPrototype):
(JSC::JSGlobalObject::asyncFunctionStructure):

  • runtime/ModuleLoaderObject.cpp:

(JSC::moduleLoaderObjectParseModule):

  • runtime/RuntimeFlags.h:

(JSC::RuntimeFlags::operator==):
(JSC::RuntimeFlags::operator!=):

  • tests/stress/async-await-basic.js: Added.

(shouldBe):
(shouldBeAsync):
(shouldThrow):
(shouldThrowAsync):
(let.AsyncFunction.async):
(async.asyncFunctionForProto):
(Object.getPrototypeOf.async):
(Object.getPrototypeOf.async.method):
(async):
(async.method):
(async.asyncNonConstructorDecl):
(shouldThrow.new.async):
(shouldThrow.new.async.nonConstructor):
(async.asyncDecl):
(async.f):
(MyError):
(async.asyncDeclThrower):
(shouldThrowAsync.async):
(resolveLater):
(rejectLater):
(async.resumeAfterNormal):
(O.async.resumeAfterNormal):
(resumeAfterNormalArrow.async):
(async.resumeAfterThrow):
(O.async.resumeAfterThrow):
(resumeAfterThrowArrow.async):
(catch):

  • tests/stress/async-await-module-reserved-word.js: Added.

(shouldThrow):
(SyntaxError.Canstring_appeared_hereawait.checkModuleSyntaxError.String.raw.await):
(checkModuleSyntaxError.String.raw.await):
(checkModuleSyntaxError.String.raw.async.await):
(SyntaxError.Cannot.declare.named):

  • tests/stress/async-await-mozilla.js: Added.

(shouldBe):
(shouldBeAsync):
(shouldThrow):
(shouldThrowAsync):
(assert):
(shouldThrowSyntaxError):
(mozSemantics.async.empty):
(mozSemantics.async.simpleReturn):
(mozSemantics.async.simpleAwait):
(mozSemantics.async.simpleAwaitAsync):
(mozSemantics.async.returnOtherAsync):
(mozSemantics.async.simpleThrower):
(mozSemantics.async.delegatedThrower):
(mozSemantics.async.tryCatch):
(mozSemantics.async.tryCatchThrow):
(mozSemantics.async.wellFinally):
(mozSemantics.async.finallyMayFail):
(mozSemantics.async.embedded.async.inner):
(mozSemantics.async.embedded):
(mozSemantics.async.fib):
(mozSemantics.async.isOdd.async.isEven):
(mozSemantics.async.isOdd):
(mozSemantics.hardcoreFib.async.fib2):
(mozSemantics.namedAsyncExpr.async.simple):
(mozSemantics.async.executionOrder.async.first):
(mozSemantics.async.executionOrder.async.second):
(mozSemantics.async.executionOrder.async.third):
(mozSemantics.async.executionOrder):
(mozSemantics.async.miscellaneous):
(mozSemantics.thrower):
(mozSemantics.async.defaultArgs):
(mozSemantics.shouldThrow):
(mozSemantics):
(mozMethods.X):
(mozMethods.X.prototype.async.getValue):
(mozMethods.X.prototype.setValue):
(mozMethods.X.prototype.async.increment):
(mozMethods.X.prototype.async.getBaseClassName):
(mozMethods.X.async.getStaticValue):
(mozMethods.Y.prototype.async.getBaseClassName):
(mozMethods.Y):
(mozFunctionNameInferrence.async.test):
(mozSyntaxErrors):

  • tests/stress/async-await-reserved-word.js: Added.

(assert):
(shouldThrowSyntaxError):
(AsyncFunction.async):

  • tests/stress/async_arrow_functions_lexical_arguments_binding.js: Added.

(shouldBe):
(shouldBeAsync):
(shouldThrowAsync):
(noArgumentsArrow2.async):

  • tests/stress/async_arrow_functions_lexical_new.target_binding.js: Added.

(shouldBe):
(shouldBeAsync):
(shouldThrowAsync):
(C1):
(C2):
(shouldThrowAsync.async):

  • tests/stress/async_arrow_functions_lexical_super_binding.js: Added.

(shouldBe):
(shouldBeAsync):
(BaseClass.prototype.baseClassValue):
(BaseClass):
(ChildClass.prototype.asyncSuperProp):
(ChildClass.prototype.asyncSuperProp2):
(ChildClass):

  • tests/stress/async_arrow_functions_lexical_this_binding.js: Added.

(shouldBe):
(shouldBeAsync):
(d.y):

Source/WebKit/mac:

  • WebView/WebPreferencesPrivate.h:

Source/WebKit/win:

  • Interfaces/IWebPreferencesPrivate.idl:

Source/WebKit2:

  • UIProcess/API/C/WKPreferencesRefPrivate.h:
  • UIProcess/API/Cocoa/WKPreferencesPrivate.h:
File:
1 edited

Legend:

Unmodified
Added
Removed

  • trunk/Source/JavaScriptCore/parser/ParserModes.h

    r201328 r201481  
    2828#define ParserModes_h
    2929
     30#include "ConstructAbility.h"
    3031#include "Identifier.h"
    3132
    … …  
    5152    MethodMode,
    5253    ArrowFunctionMode,
     54    AsyncFunctionBodyMode,
     55    AsyncArrowFunctionBodyMode,
     56    AsyncFunctionMode,
     57    AsyncMethodMode,
     58    AsyncArrowFunctionMode,
    5359    ProgramMode,
    5460    ModuleAnalyzeMode,
    … …  
    6672    case SourceParseMode::MethodMode:
    6773    case SourceParseMode::ArrowFunctionMode:
    68         return true;
    69 
    70     case SourceParseMode::ProgramMode:
    71     case SourceParseMode::ModuleAnalyzeMode:
    72     case SourceParseMode::ModuleEvaluateMode:
     74    case SourceParseMode::AsyncFunctionBodyMode:
     75    case SourceParseMode::AsyncFunctionMode:
     76    case SourceParseMode::AsyncMethodMode:
     77    case SourceParseMode::AsyncArrowFunctionMode:
     78    case SourceParseMode::AsyncArrowFunctionBodyMode:
     79        return true;
     80
     81    case SourceParseMode::ProgramMode:
     82    case SourceParseMode::ModuleAnalyzeMode:
     83    case SourceParseMode::ModuleEvaluateMode:
     84        return false;
     85    }
     86    RELEASE_ASSERT_NOT_REACHED();
     87    return false;
     88}
     89
     90inline bool isAsyncFunctionParseMode(SourceParseMode parseMode)
     91{
     92    switch (parseMode) {
     93    case SourceParseMode::AsyncFunctionBodyMode:
     94    case SourceParseMode::AsyncArrowFunctionBodyMode:
     95    case SourceParseMode::AsyncFunctionMode:
     96    case SourceParseMode::AsyncMethodMode:
     97    case SourceParseMode::AsyncArrowFunctionMode:
     98        return true;
     99
     100    case SourceParseMode::NormalFunctionMode:
     101    case SourceParseMode::GeneratorBodyMode:
     102    case SourceParseMode::GeneratorWrapperFunctionMode:
     103    case SourceParseMode::GetterMode:
     104    case SourceParseMode::SetterMode:
     105    case SourceParseMode::MethodMode:
     106    case SourceParseMode::ArrowFunctionMode:
     107    case SourceParseMode::ModuleAnalyzeMode:
     108    case SourceParseMode::ModuleEvaluateMode:
     109    case SourceParseMode::ProgramMode:
     110        return false;
     111    }
     112    RELEASE_ASSERT_NOT_REACHED();
     113    return false;
     114}
     115
     116inline bool isAsyncArrowFunctionParseMode(SourceParseMode parseMode)
     117{
     118    switch (parseMode) {
     119    case SourceParseMode::AsyncArrowFunctionMode:
     120    case SourceParseMode::AsyncArrowFunctionBodyMode:
     121        return true;
     122
     123    case SourceParseMode::NormalFunctionMode:
     124    case SourceParseMode::GeneratorBodyMode:
     125    case SourceParseMode::GeneratorWrapperFunctionMode:
     126    case SourceParseMode::GetterMode:
     127    case SourceParseMode::SetterMode:
     128    case SourceParseMode::MethodMode:
     129    case SourceParseMode::ArrowFunctionMode:
     130    case SourceParseMode::ModuleAnalyzeMode:
     131    case SourceParseMode::ModuleEvaluateMode:
     132    case SourceParseMode::AsyncFunctionBodyMode:
     133    case SourceParseMode::AsyncMethodMode:
     134    case SourceParseMode::AsyncFunctionMode:
     135    case SourceParseMode::ProgramMode:
     136        return false;
     137    }
     138
     139    RELEASE_ASSERT_NOT_REACHED();
     140    return false;
     141}
     142
     143inline bool isAsyncFunctionWrapperParseMode(SourceParseMode parseMode)
     144{
     145    switch (parseMode) {
     146    case SourceParseMode::AsyncFunctionMode:
     147    case SourceParseMode::AsyncMethodMode:
     148    case SourceParseMode::AsyncArrowFunctionMode:
     149        return true;
     150
     151    case SourceParseMode::AsyncFunctionBodyMode:
     152    case SourceParseMode::AsyncArrowFunctionBodyMode:
     153    case SourceParseMode::NormalFunctionMode:
     154    case SourceParseMode::GeneratorBodyMode:
     155    case SourceParseMode::GeneratorWrapperFunctionMode:
     156    case SourceParseMode::GetterMode:
     157    case SourceParseMode::SetterMode:
     158    case SourceParseMode::MethodMode:
     159    case SourceParseMode::ArrowFunctionMode:
     160    case SourceParseMode::ModuleAnalyzeMode:
     161    case SourceParseMode::ModuleEvaluateMode:
     162    case SourceParseMode::ProgramMode:
     163        return false;
     164    }
     165    RELEASE_ASSERT_NOT_REACHED();
     166    return false;
     167}
     168
     169inline bool isAsyncFunctionBodyParseMode(SourceParseMode parseMode)
     170{
     171    switch (parseMode) {
     172    case SourceParseMode::AsyncFunctionBodyMode:
     173    case SourceParseMode::AsyncArrowFunctionBodyMode:
     174        return true;
     175
     176    case SourceParseMode::NormalFunctionMode:
     177    case SourceParseMode::GeneratorBodyMode:
     178    case SourceParseMode::GeneratorWrapperFunctionMode:
     179    case SourceParseMode::GetterMode:
     180    case SourceParseMode::SetterMode:
     181    case SourceParseMode::MethodMode:
     182    case SourceParseMode::ArrowFunctionMode:
     183    case SourceParseMode::AsyncFunctionMode:
     184    case SourceParseMode::AsyncMethodMode:
     185    case SourceParseMode::AsyncArrowFunctionMode:
     186    case SourceParseMode::ModuleAnalyzeMode:
     187    case SourceParseMode::ModuleEvaluateMode:
     188    case SourceParseMode::ProgramMode:
    73189        return false;
    74190    }
    … …  
    91207    case SourceParseMode::MethodMode:
    92208    case SourceParseMode::ArrowFunctionMode:
     209    case SourceParseMode::AsyncFunctionBodyMode:
     210    case SourceParseMode::AsyncFunctionMode:
     211    case SourceParseMode::AsyncMethodMode:
     212    case SourceParseMode::AsyncArrowFunctionMode:
     213    case SourceParseMode::AsyncArrowFunctionBodyMode:
    93214    case SourceParseMode::ProgramMode:
    94215        return false;
    … …  
    111232    case SourceParseMode::MethodMode:
    112233    case SourceParseMode::ArrowFunctionMode:
    113     case SourceParseMode::ModuleAnalyzeMode:
    114     case SourceParseMode::ModuleEvaluateMode:
    115         return false;
    116     }
    117     RELEASE_ASSERT_NOT_REACHED();
    118     return false;
     234    case SourceParseMode::AsyncFunctionBodyMode:
     235    case SourceParseMode::AsyncFunctionMode:
     236    case SourceParseMode::AsyncMethodMode:
     237    case SourceParseMode::AsyncArrowFunctionMode:
     238    case SourceParseMode::AsyncArrowFunctionBodyMode:
     239    case SourceParseMode::ModuleAnalyzeMode:
     240    case SourceParseMode::ModuleEvaluateMode:
     241        return false;
     242    }
     243    RELEASE_ASSERT_NOT_REACHED();
     244    return false;
     245}
     246
     247inline ConstructAbility constructAbilityForParseMode(SourceParseMode parseMode)
     248{
     249    switch (parseMode) {
     250    case SourceParseMode::NormalFunctionMode:
     251        return ConstructAbility::CanConstruct;
     252
     253    case SourceParseMode::GeneratorBodyMode:
     254    case SourceParseMode::GeneratorWrapperFunctionMode:
     255    case SourceParseMode::GetterMode:
     256    case SourceParseMode::SetterMode:
     257    case SourceParseMode::MethodMode:
     258    case SourceParseMode::ArrowFunctionMode:
     259    case SourceParseMode::AsyncFunctionBodyMode:
     260    case SourceParseMode::AsyncArrowFunctionBodyMode:
     261    case SourceParseMode::AsyncFunctionMode:
     262    case SourceParseMode::AsyncMethodMode:
     263    case SourceParseMode::AsyncArrowFunctionMode:
     264        return ConstructAbility::CannotConstruct;
     265
     266    case SourceParseMode::ProgramMode:
     267    case SourceParseMode::ModuleAnalyzeMode:
     268    case SourceParseMode::ModuleEvaluateMode:
     269        break;
     270    }
     271    RELEASE_ASSERT_NOT_REACHED();
     272    return ConstructAbility::CanConstruct;
    119273}
    120274
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