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Bug 1343481 - Part 2: Stop using StarGegerator for async function.

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Tag #1287
This commit is contained in:
Gaming4JC 2019-12-01 18:44:06 -05:00 • committed by Roy Tam
commit 45337018ef
10 changed files with 58 additions and 55 deletions
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2
js/src/frontend/BytecodeCompiler.cpp
View file

@ -727,5 +727,5 @@ frontend::CompileStandaloneAsyncFunction(JSContext* cx, MutableHandleFunction fu
BytecodeCompiler compiler(cx, cx->tempLifoAlloc(), options, srcBuf, emptyGlobalScope,
TraceLogger_ParserCompileFunction);
return compiler.compileStandaloneFunction(fun, StarGenerator, AsyncFunction, parameterListEnd);
return compiler.compileStandaloneFunction(fun, NotGenerator, AsyncFunction, parameterListEnd);
}

23
js/src/frontend/BytecodeEmitter.cpp
View file

@ -8443,7 +8443,8 @@ BytecodeEmitter::emitReturn(ParseNode* pn)
if (!updateSourceCoordNotes(pn->pn_pos.begin))
return false;
if (sc->isFunctionBox() && sc->asFunctionBox()->isStarGenerator()) {
bool needsIteratorResult = sc->isFunctionBox() && sc->asFunctionBox()->needsIteratorResult();
if (needsIteratorResult) {
if (!emitPrepareIteratorResult())
return false;
}
@ -8458,7 +8459,7 @@ BytecodeEmitter::emitReturn(ParseNode* pn)
return false;
}
if (sc->isFunctionBox() && sc->asFunctionBox()->isStarGenerator()) {
if (needsIteratorResult) {
if (!emitFinishIteratorResult(true))
return false;
}
@ -8530,7 +8531,8 @@ BytecodeEmitter::emitYield(ParseNode* pn)
MOZ_ASSERT(sc->isFunctionBox());
if (pn->getOp() == JSOP_YIELD) {
if (sc->asFunctionBox()->isStarGenerator()) {
bool needsIteratorResult = sc->asFunctionBox()->needsIteratorResult();
if (needsIteratorResult) {
if (!emitPrepareIteratorResult())
return false;
}
@ -8541,7 +8543,7 @@ BytecodeEmitter::emitYield(ParseNode* pn)
if (!emit1(JSOP_UNDEFINED))
return false;
}
if (sc->asFunctionBox()->isStarGenerator()) {
if (needsIteratorResult) {
if (!emitFinishIteratorResult(false))
return false;
}
@ -10320,14 +10322,19 @@ BytecodeEmitter::emitFunctionBody(ParseNode* funBody)
if (funbox->needsFinalYield()) {
// If we fall off the end of a generator, do a final yield.
if (funbox->isStarGenerator() && !emitPrepareIteratorResult())
return false;
bool needsIteratorResult = funbox->needsIteratorResult();
if (needsIteratorResult) {
if (!emitPrepareIteratorResult())
return false;
}
if (!emit1(JSOP_UNDEFINED))
return false;
if (funbox->isStarGenerator() && !emitFinishIteratorResult(true))
return false;
if (needsIteratorResult) {
if (!emitFinishIteratorResult(true))
return false;
}
if (!emit1(JSOP_SETRVAL))
return false;

54
js/src/frontend/Parser.cpp
View file

@ -2474,10 +2474,8 @@ Parser<SyntaxParseHandler>::finishFunction(bool isStandaloneFunction /* = false
}
static YieldHandling
GetYieldHandling(GeneratorKind generatorKind, FunctionAsyncKind asyncKind)
GetYieldHandling(GeneratorKind generatorKind)
{
if (asyncKind == AsyncFunction)
return YieldIsName;
if (generatorKind == NotGenerator)
return YieldIsName;
return YieldIsKeyword;
@ -2541,7 +2539,7 @@ Parser<FullParseHandler>::standaloneFunction(HandleFunction fun,
return null();
funpc.setIsStandaloneFunctionBody();
YieldHandling yieldHandling = GetYieldHandling(generatorKind, asyncKind);
YieldHandling yieldHandling = GetYieldHandling(generatorKind);
AutoAwaitIsKeyword<FullParseHandler> awaitIsKeyword(this, asyncKind == AsyncFunction);
if (!functionFormalParametersAndBody(InAllowed, yieldHandling, fn, Statement,
parameterListEnd, /* isStandaloneFunction = */ true))
@ -2699,7 +2697,7 @@ Parser<ParseHandler>::functionBody(InHandling inHandling, YieldHandling yieldHan
switch (pc->generatorKind()) {
case NotGenerator:
MOZ_ASSERT(pc->lastYieldOffset == startYieldOffset);
MOZ_ASSERT_IF(!pc->isAsync(), pc->lastYieldOffset == startYieldOffset);
break;
case LegacyGenerator:
@ -2715,8 +2713,8 @@ Parser<ParseHandler>::functionBody(InHandling inHandling, YieldHandling yieldHan
break;
case StarGenerator:
MOZ_ASSERT_IF(!pc->isAsync(), kind != Arrow);
MOZ_ASSERT_IF(!pc->isAsync(), type == StatementListBody);
MOZ_ASSERT(kind != Arrow);
MOZ_ASSERT(type == StatementListBody);
break;
}
@ -2761,9 +2759,9 @@ Parser<ParseHandler>::newFunction(HandleAtom atom, FunctionSyntaxKind kind,
#endif
switch (kind) {
case Expression:
flags = (generatorKind == NotGenerator
flags = (generatorKind == NotGenerator && asyncKind == SyncFunction
? JSFunction::INTERPRETED_LAMBDA
: JSFunction::INTERPRETED_LAMBDA_GENERATOR);
: JSFunction::INTERPRETED_LAMBDA_GENERATOR_OR_ASYNC);
break;
case Arrow:
flags = JSFunction::INTERPRETED_LAMBDA_ARROW;
@ -2771,9 +2769,9 @@ Parser<ParseHandler>::newFunction(HandleAtom atom, FunctionSyntaxKind kind,
break;
case Method:
MOZ_ASSERT(generatorKind == NotGenerator || generatorKind == StarGenerator);
flags = (generatorKind == NotGenerator
flags = (generatorKind == NotGenerator && asyncKind == SyncFunction
? JSFunction::INTERPRETED_METHOD
: JSFunction::INTERPRETED_METHOD_GENERATOR);
: JSFunction::INTERPRETED_METHOD_GENERATOR_OR_ASYNC);
allocKind = gc::AllocKind::FUNCTION_EXTENDED;
break;
case ClassConstructor:
@ -2799,9 +2797,9 @@ Parser<ParseHandler>::newFunction(HandleAtom atom, FunctionSyntaxKind kind,
allocKind = gc::AllocKind::FUNCTION_EXTENDED;
}
#endif
flags = (generatorKind == NotGenerator
flags = (generatorKind == NotGenerator && asyncKind == SyncFunction
? JSFunction::INTERPRETED_NORMAL
: JSFunction::INTERPRETED_GENERATOR);
: JSFunction::INTERPRETED_GENERATOR_OR_ASYNC);
}
// We store the async wrapper in a slot for later access.
@ -3324,7 +3322,6 @@ Parser<ParseHandler>::functionDefinition(uint32_t toStringStart, Node pn, InHand
bool tryAnnexB /* = false */)
{
MOZ_ASSERT_IF(kind == Statement, funName);
MOZ_ASSERT_IF(asyncKind == AsyncFunction, generatorKind == StarGenerator);
// When fully parsing a LazyScript, we do not fully reparse its inner
// functions, which are also lazy. Instead, their free variables and
@ -3336,7 +3333,7 @@ Parser<ParseHandler>::functionDefinition(uint32_t toStringStart, Node pn, InHand
}
RootedObject proto(context);
if (generatorKind == StarGenerator) {
if (generatorKind == StarGenerator || asyncKind == AsyncFunction) {
// If we are off the main thread, the generator meta-objects have
// already been created by js::StartOffThreadParseScript, so cx will not
// be necessary.
@ -3408,7 +3405,7 @@ Parser<FullParseHandler>::trySyntaxParseInnerFunction(ParseNode* pn, HandleFunct
// parse to avoid the overhead of a lazy syntax-only parse. Although
// the prediction may be incorrect, IIFEs are common enough that it
// pays off for lots of code.
if (pn->isLikelyIIFE() && generatorKind == NotGenerator)
if (pn->isLikelyIIFE() && generatorKind == NotGenerator && asyncKind == SyncFunction)
break;
Parser<SyntaxParseHandler>* parser = handler.syntaxParser;
@ -3584,7 +3581,7 @@ Parser<FullParseHandler>::standaloneLazyFunction(HandleFunction fun, bool strict
if (!tokenStream.peekTokenPos(&pn->pn_pos, modifier))
return null();
YieldHandling yieldHandling = GetYieldHandling(generatorKind, asyncKind);
YieldHandling yieldHandling = GetYieldHandling(generatorKind);
FunctionSyntaxKind syntaxKind = Statement;
if (fun->isClassConstructor())
syntaxKind = ClassConstructor;
@ -3665,7 +3662,7 @@ Parser<ParseHandler>::functionFormalParametersAndBody(InHandling inHandling,
return false;
uint32_t openedPos = 0;
if (tt != TOK_LC) {
if ((funbox->isStarGenerator() && !funbox->isAsync()) || kind == Method ||
if (funbox->isStarGenerator() || kind == Method ||
kind == GetterNoExpressionClosure || kind == SetterNoExpressionClosure ||
IsConstructorKind(kind)) {
error(JSMSG_CURLY_BEFORE_BODY);
@ -3695,7 +3692,7 @@ Parser<ParseHandler>::functionFormalParametersAndBody(InHandling inHandling,
// whether the arrow function is enclosed in a generator function or not.
// Whereas the |yield| in the function body is always parsed as a name.
// The same goes when parsing |await| in arrow functions.
YieldHandling bodyYieldHandling = GetYieldHandling(pc->generatorKind(), pc->asyncKind());
YieldHandling bodyYieldHandling = GetYieldHandling(pc->generatorKind());
Node body;
{
AutoAwaitIsKeyword<ParseHandler> awaitIsKeyword(this, funbox->isAsync());
@ -3786,7 +3783,7 @@ Parser<ParseHandler>::functionStmt(uint32_t toStringStart, YieldHandling yieldHa
if (!tokenStream.getToken(&tt))
return null();
GeneratorKind generatorKind = asyncKind == AsyncFunction ? StarGenerator : NotGenerator;
GeneratorKind generatorKind = NotGenerator;
if (tt == TOK_MUL) {
if (asyncKind != SyncFunction) {
error(JSMSG_ASYNC_GENERATOR);
@ -3817,7 +3814,7 @@ Parser<ParseHandler>::functionStmt(uint32_t toStringStart, YieldHandling yieldHa
MOZ_ASSERT(declaredInStmt->kind() != StatementKind::Label);
MOZ_ASSERT(StatementKindIsBraced(declaredInStmt->kind()));
if (!pc->sc()->strict() && generatorKind == NotGenerator) {
if (!pc->sc()->strict() && generatorKind == NotGenerator && asyncKind == SyncFunction) {
// In sloppy mode, try Annex B.3.3 semantics. If making an
// additional 'var' binding of the same name does not throw an
// early error, do so. This 'var' binding would be assigned
@ -3841,7 +3838,7 @@ Parser<ParseHandler>::functionStmt(uint32_t toStringStart, YieldHandling yieldHa
if (!pn)
return null();
YieldHandling newYieldHandling = GetYieldHandling(generatorKind, asyncKind);
YieldHandling newYieldHandling = GetYieldHandling(generatorKind);
return functionDefinition(toStringStart, pn, InAllowed, newYieldHandling,
name, Statement, generatorKind, asyncKind, tryAnnexB);
}
@ -3854,7 +3851,7 @@ Parser<ParseHandler>::functionExpr(uint32_t toStringStart, InvokedPrediction inv
MOZ_ASSERT(tokenStream.isCurrentTokenType(TOK_FUNCTION));
AutoAwaitIsKeyword<ParseHandler> awaitIsKeyword(this, asyncKind == AsyncFunction);
GeneratorKind generatorKind = asyncKind == AsyncFunction ? StarGenerator : NotGenerator;
GeneratorKind generatorKind = NotGenerator;
TokenKind tt;
if (!tokenStream.getToken(&tt))
return null();
@ -3869,7 +3866,7 @@ Parser<ParseHandler>::functionExpr(uint32_t toStringStart, InvokedPrediction inv
return null();
}
YieldHandling yieldHandling = GetYieldHandling(generatorKind, asyncKind);
YieldHandling yieldHandling = GetYieldHandling(generatorKind);
RootedPropertyName name(context);
if (TokenKindIsPossibleIdentifier(tt)) {
@ -8187,7 +8184,6 @@ Parser<ParseHandler>::assignExpr(InHandling inHandling, YieldHandling yieldHandl
uint32_t toStringStart = pos().begin;
tokenStream.ungetToken();
GeneratorKind generatorKind = NotGenerator;
FunctionAsyncKind asyncKind = SyncFunction;
if (next == TOK_ASYNC) {
@ -8200,7 +8196,6 @@ Parser<ParseHandler>::assignExpr(InHandling inHandling, YieldHandling yieldHandl
if (nextSameLine == TOK_ARROW) {
tokenStream.ungetToken();
} else {
generatorKind = StarGenerator;
asyncKind = AsyncFunction;
}
}
@ -8210,7 +8205,7 @@ Parser<ParseHandler>::assignExpr(InHandling inHandling, YieldHandling yieldHandl
return null();
Node arrowFunc = functionDefinition(toStringStart, pn, inHandling, yieldHandling, nullptr,
Arrow, generatorKind, asyncKind);
Arrow, NotGenerator, asyncKind);
if (!arrowFunc)
return null();
@ -9950,8 +9945,7 @@ Parser<ParseHandler>::methodDefinition(uint32_t toStringStart, PropertyType prop
MOZ_CRASH("Parser: methodDefinition: unexpected property type");
}
GeneratorKind generatorKind = (propType == PropertyType::GeneratorMethod ||
propType == PropertyType::AsyncMethod)
GeneratorKind generatorKind = propType == PropertyType::GeneratorMethod
? StarGenerator
: NotGenerator;
@ -9959,7 +9953,7 @@ Parser<ParseHandler>::methodDefinition(uint32_t toStringStart, PropertyType prop
? AsyncFunction
: SyncFunction;
YieldHandling yieldHandling = GetYieldHandling(generatorKind, asyncKind);
YieldHandling yieldHandling = GetYieldHandling(generatorKind);
Node pn = handler.newFunctionExpression();
if (!pn)

4
js/src/frontend/SharedContext.h
View file

@ -552,6 +552,10 @@ class FunctionBox : public ObjectBox, public SharedContext
return isStarGenerator() || isLegacyGenerator() || isAsync();
}
bool needsIteratorResult() const {
return isStarGenerator() || isAsync();
}
bool isAsync() const { return asyncKind() == AsyncFunction; }
bool isArrow() const { return function()->isArrow(); }