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Cache generic signature instantiations

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This commit is contained in:
Anders Hejlsberg 2016-11-05 08:20:02 -07:00
parent ed4fead087
commit 61b9da548a
2 changed files with 9 additions and 1 deletions
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8
src/compiler/checker.ts
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@ -4232,7 +4232,7 @@ namespace ts {
for (const baseSig of baseSignatures) {
const typeParamCount = baseSig.typeParameters ? baseSig.typeParameters.length : 0;
if (typeParamCount === typeArgCount) {
const sig = typeParamCount ? getSignatureInstantiation(baseSig, typeArguments) : cloneSignature(baseSig);
const sig = typeParamCount ? createSignatureInstantiation(baseSig, typeArguments) : cloneSignature(baseSig);
sig.typeParameters = classType.localTypeParameters;
sig.resolvedReturnType = classType;
result.push(sig);
@ -4982,6 +4982,12 @@ namespace ts {
}
function getSignatureInstantiation(signature: Signature, typeArguments: Type[]): Signature {
const instantiations = signature.instantiations || (signature.instantiations = createMap<Signature>());
const id = getTypeListId(typeArguments);
return instantiations[id] || (instantiations[id] = createSignatureInstantiation(signature, typeArguments));
}
function createSignatureInstantiation(signature: Signature, typeArguments: Type[]): Signature {
return instantiateSignature(signature, createTypeMapper(signature.typeParameters, typeArguments), /*eraseTypeParameters*/ true);
}

2
src/compiler/types.ts
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@ -2923,6 +2923,8 @@ namespace ts {
isolatedSignatureType?: ObjectType; // A manufactured type that just contains the signature for purposes of signature comparison
/* @internal */
typePredicate?: TypePredicate;
/* @internal */
instantiations?: Map<Signature>; // Generic signature instantiation cache
}
export const enum IndexKind {