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AST: Add ProtocolConformanceRef::getWitnessByName()

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This commit is contained in:
Slava Pestov
2019-05-14 18:09:57 -04:00
parent 6e3609dc22
commit 86f9ca7245
3 changed files with 45 additions and 76 deletions
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28
lib/AST/ProtocolConformance.cpp
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@@ -164,6 +164,34 @@ ProtocolConformanceRef::getTypeWitnessByName(Type type, Identifier name) const {
SubstitutionMap::getProtocolSubstitutions(proto, type, *this));
}
ConcreteDeclRef
ProtocolConformanceRef::getWitnessByName(Type type, DeclName name) const {
// Find the named requirement.
auto *proto = getRequirement();
auto results =
proto->lookupDirect(name,
NominalTypeDecl::LookupDirectFlags::IgnoreNewExtensions);
ValueDecl *requirement = nullptr;
for (auto *result : results) {
if (isa<ProtocolDecl>(result->getDeclContext()))
requirement = result;
}
if (requirement == nullptr)
return ConcreteDeclRef();
// For a type with dependent conformance, just return the requirement from
// the protocol. There are no protocol conformance tables.
if (!isConcrete()) {
auto subs = SubstitutionMap::getProtocolSubstitutions(proto, type, *this);
return ConcreteDeclRef(requirement, subs);
}
auto *resolver = proto->getASTContext().getLazyResolver();
return getConcrete()->getWitnessDeclRef(requirement, resolver);
}
void *ProtocolConformance::operator new(size_t bytes, ASTContext &context,
AllocationArena arena,
unsigned alignment) {