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[NFC] AST: Define SubstitutionMap::getInnermostReplacementTypes #31812

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AnthonyLatsis
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@AnthonyLatsis AnthonyLatsis commented May 15, 2020

In preparation for storing substitution maps in bound generic types, centralize the logic for retrieving the innermost generic arguments in a new method on SubstitutionMap.

I wasn't able to find any duplication to clean up, so right now the only client is TypeAliasType::getInnermostGenericArgs. The idea is for the new method to ultimately have at least two clients, including a future BoundGenericType::getInnermostGenericArgs.


For #31895

@AnthonyLatsis AnthonyLatsis requested a review from slavapestov May 15, 2020 09:56
@AnthonyLatsis AnthonyLatsis force-pushed the substitution-revolution-pre-1 branch from 47232d3 to bf0e348 Compare May 15, 2020 10:38
/// arguments that are directly applied to the typealias declaration
/// produced by \c getDecl(). Generic arguments applied to a parent
/// type are not included.
ArrayRef<Type> getInnermostGenericArgs() const;
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I am not a fan of getInnermostGenericArgs though. "Direct" generic arguments and innermost generic arguments are not always the same thing.

@AnthonyLatsis AnthonyLatsis force-pushed the substitution-revolution-pre-1 branch from bf0e348 to eedb335 Compare May 15, 2020 11:22
@AnthonyLatsis
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@swift-ci please smoke test

@AnthonyLatsis
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@slavapestov ping

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Thanks!

@AnthonyLatsis AnthonyLatsis merged commit 01e6cb3 into swiftlang:master Jun 19, 2020
@AnthonyLatsis AnthonyLatsis deleted the substitution-revolution-pre-1 branch June 20, 2020 00:58
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3 participants