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[cxx-interop] Avoid spurious references to _OBJC_CLASS symbols for C++ foreign reference types #84665

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Merged
merged 1 commit into from
Oct 6, 2025
+15 −0
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[cxx-interop] Avoid spurious references to _OBJC_CLASS symbols for C++ foreign reference types #84665

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6 changes: 6 additions & 0 deletions lib/AST/Type.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4413,6 +4413,12 @@ bool Type::findIf(llvm::function_ref<bool(Type)> pred) const {
}

TypeTraitResult TypeBase::canBeClass() {
// Foreign reference types are represented as Swift classes in the AST,
// however, they use custom retain/release operations, and therefore aren't
// AnyObjects.
if (isForeignReferenceType())
return TypeTraitResult::IsNot;

// Any bridgeable object type can be a class.
if (isBridgeableObjectType())
return TypeTraitResult::Is;
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9 changes: 9 additions & 0 deletions test/Interop/Cxx/foreign-reference/array-of-classes.swift
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Expand Up @@ -58,6 +58,15 @@ func go() {
y.append(x)
// CHECK: 1
print(y.count)

var loopCount = 0
for it in y {
// CHECK: RefType()
print(it)
loopCount += 1
}
// CHECK: 1
print(loopCount)
}

go()
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