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Allow derived->base conversions with compatible qualifiers (#7415)

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Move the existing derived->base conversion earlier in
`PerformBuiltinConversion`, into the block that handles qualifier
conversions. This allows, for example, converting from `partial Derived`
to `partial Base` -- see the tests in
`toolchain/check/testdata/class/inheritance/derived_to_base.carbon`.
This commit is contained in:
Nicholas Bishop
2026-06-24 21:08:24 +00:00
committed by GitHub
parent f2d99f31f0
commit 885b1110d5
20 changed files with 345 additions and 288 deletions
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toolchain/lower/testdata/interop/cpp/class/import/method.carbon
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+3 -3
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@@ -262,11 +262,11 @@ fn F(ref r: Cpp.A) {
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CUseVal.Main(ptr %a) #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_4.2.base = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 0, !dbg !17
// CHECK:STDOUT: %Base.virt0.call.vtable = load ptr, ptr %.loc7_4.2.base, align 8, !dbg !17
// CHECK:STDOUT: %.loc7_4.3.vptr = getelementptr inbounds nuw [8 x i8], ptr %a, i32 0, i32 0, !dbg !17
// CHECK:STDOUT: %Base.virt0.call.vtable = load ptr, ptr %.loc7_4.3.vptr, align 8, !dbg !17
// CHECK:STDOUT: %Base.virt0.call = getelementptr ptr, ptr %Base.virt0.call.vtable, i32 0, !dbg !17
// CHECK:STDOUT: %Base.virt0.call.memptr.virtualfn = load ptr, ptr %Base.virt0.call, align 8, !dbg !17
// CHECK:STDOUT: call void %Base.virt0.call.memptr.virtualfn(ptr %.loc7_4.2.base), !dbg !17
// CHECK:STDOUT: call void %Base.virt0.call.memptr.virtualfn(ptr %.loc7_4.3.vptr), !dbg !17
// CHECK:STDOUT: %A.virt1.call.vtable = load ptr, ptr %a, align 8, !dbg !18
// CHECK:STDOUT: %A.virt1.call = getelementptr ptr, ptr %A.virt1.call.vtable, i32 1, !dbg !18
// CHECK:STDOUT: %A.virt1.call.memptr.virtualfn = load ptr, ptr %A.virt1.call, align 8, !dbg !18