averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

embedded: fix specialization of associated conformance entries in witness tables

Browse Source 
When creating a specialized witness table, we need to get the right specialized conformance.
In IRGen don't emit associated conformance witness table entries if the protocol is not a class protocol.
In this case the associated type can never be used to create an existential. Therefore such a witness table entry is never used at runtime in embedded swift.

Fixes a compiler crash

rdar://146448091
This commit is contained in:
Erik Eckstein
2025-03-11 11:33:10 +01:00
parent ecfa808425
commit 23b4c6fc34
3 changed files with 106 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
SwiftCompilerSources/Sources/Optimizer/Utilities/GenericSpecialization.swift
View File

@@ -144,11 +144,14 @@ func specializeWitnessTable(forConformance conformance: Conformance,
case .associatedType(let requirement, let witness):
let substType = witness.subst(with: conformance.specializedSubstitutions)
return .associatedType(requirement: requirement, witness: substType)
case .associatedConformance(let requirement, let proto, let witness):
if witness.isSpecialized {
specializeWitnessTable(forConformance: witness, errorLocation: errorLocation, context, notifyNewWitnessTable)
case .associatedConformance(let requirement, let proto, _):
let concreteAssociateConf = conformance.getAssociatedConformance(ofAssociatedType: requirement.type, to: proto)
if concreteAssociateConf.isSpecialized {
specializeWitnessTable(forConformance: concreteAssociateConf,
errorLocation: errorLocation,
context, notifyNewWitnessTable)
}
return .associatedConformance(requirement: requirement, protocol: proto, witness: witness)
return .associatedConformance(requirement: requirement, protocol: proto, witness: concreteAssociateConf)
}
}
let newWT = context.createWitnessTable(entries: newEntries,conformance: conformance,