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NFC: Add GenericSignature::getCanonicalSignature. (#29105)

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Motivation: `GenericSignatureImpl::getCanonicalSignature` crashes for
`GenericSignature` with underlying `nullptr`. This led to verbose workarounds
when computing `CanGenericSignature` from `GenericSignature`.

Solution: `GenericSignature::getCanonicalSignature` is a wrapper around
`GenericSignatureImpl::getCanonicalSignature` that returns the canonical
signature, or `nullptr` if the underlying pointer is `nullptr`.

Rewrite all verbose workarounds using `GenericSignature::getCanonicalSignature`.
This commit is contained in:
Dan Zheng
2020-01-12 12:17:41 -08:00
committed by GitHub
parent 0d87a14785
commit 1486d6b346
42 changed files with 184 additions and 189 deletions
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2
lib/AST/RequirementEnvironment.cpp
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@@ -140,7 +140,7 @@ RequirementEnvironment::RequirementEnvironment(
reqSig->getRequirements().size() == 1) {
syntheticSignature = conformanceDC->getGenericSignatureOfContext();
if (syntheticSignature) {
syntheticSignature = syntheticSignature->getCanonicalSignature();
syntheticSignature = syntheticSignature.getCanonicalSignature();
syntheticEnvironment =
syntheticSignature->getGenericEnvironment();
}