MetadataResponse
irgen::emitArchetypeTypeMetadataRef(IRGenFunction &IGF,
CanArchetypeType archetype,
DynamicMetadataRequest request) {
// Check for an existing cache entry.
if (auto response = IGF.tryGetLocalTypeMetadata(archetype, request))
return response;
// If that's not present, this must be an associated type.
assert(!archetype->isPrimary() &&
"type metadata for primary archetype was not bound in context");
CanArchetypeType parent(archetype->getParent());
AssociatedType association(archetype->getAssocType());
MetadataResponse response =
emitAssociatedTypeMetadataRef(IGF, parent, association, request);
setTypeMetadataName(IGF.IGM, response.getMetadata(), archetype);
IGF.setScopedLocalTypeMetadata(archetype, response);
return response;
}
static IRGenFunction::ArchetypeAccessPath
findAccessPathDeclaringConformance(IRGenFunction &IGF,
CanArchetypeType archetype,
ProtocolDecl *protocol) {
// Consider all the associated type relationships we know about.
// Use the archetype's parent relationship first if possible.
if (!archetype->isPrimary()) {
auto parent = archetype.getParent();
auto association =
findConformanceDeclaration(parent->getConformsTo(),
archetype->getAssocType(), protocol);
if (association) return { parent, association };
}
for (auto accessPath : IGF.getArchetypeAccessPaths(archetype)) {
auto association =
findConformanceDeclaration(accessPath.BaseType->getConformsTo(),
accessPath.Association, protocol);
if (association) return { accessPath.BaseType, association };
}
llvm_unreachable("no relation found that declares conformance to target");
}
