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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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4
lib/SILGen/SILGenApply.cpp
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@@ -4470,8 +4470,8 @@ RValue SILGenFunction::emitApply(ResultPlanPtr &&resultPlan,
// Otherwise, the substitutions should match the generic signature.
} else {
assert(genericSig->getCanonicalSignature() ==
subs.getGenericSignature()->getCanonicalSignature());
assert(genericSig.getCanonicalSignature() ==
subs.getGenericSignature().getCanonicalSignature());
}
auto rawDirectResult = [&] {