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Rework BuiltinProtocolConformance to be more like NormalProtocolConformance.

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Give BuiltinProtocolConformance a generic signature, which can be used to
describe the generic parameters used within the builtin conformance, e.g.,
`<T1, T2, T3>` for a tuple type `(T1, T2, T3)`. Also store the
conditional requirements as trailing objects, requiring them to be
precomputed by whatever builds the conformances. Together, this means
that builtin protocol conformances act like normal conformances with
respect to conditional requirements and substitutions: they will be
defined generically, then a specialized conformance will be layered on
top to provide the substitutions.
This commit is contained in:
Doug Gregor
2021-07-27 23:07:55 -07:00
parent 20cc067844
commit ecd830e342
9 changed files with 59 additions and 76 deletions
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37
include/swift/AST/ProtocolConformance.h
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@@ -996,22 +996,21 @@ public:
/// A builtin conformance appears when a non-nominal type has a
/// conformance that is synthesized by the implementation.
class BuiltinProtocolConformance final : public RootProtocolConformance,
private llvm::TrailingObjects<BuiltinProtocolConformance,
ProtocolConformanceRef> {
private llvm::TrailingObjects<BuiltinProtocolConformance, Requirement> {
friend ASTContext;
friend TrailingObjects;
ProtocolDecl *protocol = nullptr;
size_t numConformances;
ProtocolDecl *protocol;
GenericSignature genericSig;
size_t numConditionalRequirements;
mutable Optional<ArrayRef<Requirement>> conditionalConformances = None;
size_t numTrailingObjects(OverloadToken<Requirement>) const {
return numConditionalRequirements;
}
BuiltinProtocolConformance(Type conformingType, ProtocolDecl *protocol,
ArrayRef<ProtocolConformanceRef> conformances);
size_t numTrailingObjects(OverloadToken<ProtocolConformanceRef>) const {
return numConformances;
}
GenericSignature genericSig,
ArrayRef<Requirement> conditionalRequirements);
public:
/// Get the protocol being conformed to.
@@ -1019,24 +1018,22 @@ public:
return protocol;
}
/// Get the trailing conformances that this builtin conformance needs.
MutableArrayRef<ProtocolConformanceRef> getConformances() {
return {getTrailingObjects<ProtocolConformanceRef>(), numConformances};
}
/// Get the trailing conformances that this builtin conformance needs.
ArrayRef<ProtocolConformanceRef> getConformances() const {
return {getTrailingObjects<ProtocolConformanceRef>(), numConformances};
/// Retrieve the generic signature that describes the type parameters used
/// within the conforming type.
GenericSignature getGenericSignature() const {
return genericSig;
}
/// Get any requirements that must be satisfied for this conformance to apply.
Optional<ArrayRef<Requirement>>
getConditionalRequirementsIfAvailable() const {
return ArrayRef<Requirement>();
return getConditionalRequirements();
}
/// Get any requirements that must be satisfied for this conformance to apply.
ArrayRef<Requirement> getConditionalRequirements() const;
ArrayRef<Requirement> getConditionalRequirements() const {
return {getTrailingObjects<Requirement>(), numConditionalRequirements};
}
/// Get the declaration context that contains the nominal type declaration.
DeclContext *getDeclContext() const {