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carbon-lang/toolchain/check/testdata/class/inheritance/base_method_shadow.carbon
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Richard Smith d8c4fc51cd Fix SemIR for derived-to-base conversion and lowering crash. (#7783) 
We use the same conversion codepath to handle both qualification
conversions and derived-to-base conversions, because we allow both to be
performed at once. However, we were previously modeling the
qualification conversion as happening *first*, and producing a result
whose type is the target type of the overall conversion (that is, the
base class type). That led to bogus SemIR, where a `Derived` -> `const
Base` conversion would first have a "compatible" conversion from
`Derived` to `const Base`, *then* an access of the base subobject (of
type `const Base`, within an object of type `const Base`).

We now reverse the order: first we do a derived-to-base conversion,
which already has logic to preserve qualifiers, and then we do any
necessary qualification conversions on the result to reach the overall
target type.

In passing, we now skip forming the `as_compatible` instruction at all
for a pure derived-to-base conversion that has no qualification
conversion, simplifying the SemIR by one instruction in the common case.
2026-09-15 23:11:51 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/inheritance/base_method_shadow.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/inheritance/base_method_shadow.carbon
base class A {
fn F(ref self);
}
base class B {
extend base: A;
fn F(ref self);
}
class C {
extend base: B;
fn F(ref self);
}
class D {
extend base: B;
}
fn Call(a: A*, b: B*, c: C*, d: D*) {
(*a).F();
(*b).F();
(*c).F();
(*d).F();
}
// CHECK:STDOUT: --- base_method_shadow.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %A: type = class_type @A [concrete]
// CHECK:STDOUT: %pattern_type.9ef: type = pattern_type %A [concrete]
// CHECK:STDOUT: %self.param_patt.8fb: %pattern_type.9ef = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.e64: %pattern_type.9ef = wrapper_binding_pattern self, %self.param_patt.8fb [concrete]
// CHECK:STDOUT: %A.F.type: type = fn_type @A.F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %A.F: %A.F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %B: type = class_type @B [concrete]
// CHECK:STDOUT: %B.elem: type = unbound_element_type %B, %A [concrete]
// CHECK:STDOUT: %pattern_type.e39: type = pattern_type %B [concrete]
// CHECK:STDOUT: %self.param_patt.039: %pattern_type.e39 = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.535: %pattern_type.e39 = wrapper_binding_pattern self, %self.param_patt.039 [concrete]
// CHECK:STDOUT: %B.F.type: type = fn_type @B.F [concrete]
// CHECK:STDOUT: %B.F: %B.F.type = struct_value () [concrete]
// CHECK:STDOUT: %struct_type.base.cb7: type = struct_type {.base: %A} [concrete]
// CHECK:STDOUT: %complete_type.d5e: <witness> = complete_type_witness %struct_type.base.cb7 [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %C.elem: type = unbound_element_type %C, %B [concrete]
// CHECK:STDOUT: %pattern_type.98b: type = pattern_type %C [concrete]
// CHECK:STDOUT: %self.param_patt.99a: %pattern_type.98b = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.cbd: %pattern_type.98b = wrapper_binding_pattern self, %self.param_patt.99a [concrete]
// CHECK:STDOUT: %C.F.type: type = fn_type @C.F [concrete]
// CHECK:STDOUT: %C.F: %C.F.type = struct_value () [concrete]
// CHECK:STDOUT: %struct_type.base.e05: type = struct_type {.base: %B} [concrete]
// CHECK:STDOUT: %complete_type.c77: <witness> = complete_type_witness %struct_type.base.e05 [concrete]
// CHECK:STDOUT: %D: type = class_type @D [concrete]
// CHECK:STDOUT: %D.elem: type = unbound_element_type %D, %B [concrete]
// CHECK:STDOUT: %ptr.d43: type = ptr_type %A [concrete]
// CHECK:STDOUT: %pattern_type.8a5: type = pattern_type %ptr.d43 [concrete]
// CHECK:STDOUT: %a.param_patt: %pattern_type.8a5 = value_param_pattern [concrete]
// CHECK:STDOUT: %a.patt: %pattern_type.8a5 = wrapper_binding_pattern a, %a.param_patt [concrete]
// CHECK:STDOUT: %ptr.432: type = ptr_type %B [concrete]
// CHECK:STDOUT: %pattern_type.3c8: type = pattern_type %ptr.432 [concrete]
// CHECK:STDOUT: %b.param_patt: %pattern_type.3c8 = value_param_pattern [concrete]
// CHECK:STDOUT: %b.patt: %pattern_type.3c8 = wrapper_binding_pattern b, %b.param_patt [concrete]
// CHECK:STDOUT: %ptr.6b6: type = ptr_type %C [concrete]
// CHECK:STDOUT: %pattern_type.fcb: type = pattern_type %ptr.6b6 [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.fcb = value_param_pattern [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.fcb = wrapper_binding_pattern c, %c.param_patt [concrete]
// CHECK:STDOUT: %ptr.d57: type = ptr_type %D [concrete]
// CHECK:STDOUT: %pattern_type.02f: type = pattern_type %ptr.d57 [concrete]
// CHECK:STDOUT: %d.param_patt: %pattern_type.02f = value_param_pattern [concrete]
// CHECK:STDOUT: %d.patt: %pattern_type.02f = wrapper_binding_pattern d, %d.param_patt [concrete]
// CHECK:STDOUT: %Call.type: type = fn_type @Call [concrete]
// CHECK:STDOUT: %Call: %Call.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: .B = %B.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .D = %D.decl
// CHECK:STDOUT: .Call = %Call.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %A.decl: type = class_decl @A [concrete = constants.%A] {} {}
// CHECK:STDOUT: %B.decl: type = class_decl @B [concrete = constants.%B] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: %D.decl: type = class_decl @D [concrete = constants.%D] {} {}
// CHECK:STDOUT: %Call.decl: %Call.type = fn_decl @Call [concrete = constants.%Call] {
// CHECK:STDOUT: %a.param_patt: %pattern_type.8a5 = value_param_pattern [concrete = constants.%a.param_patt]
// CHECK:STDOUT: %a.patt: %pattern_type.8a5 = wrapper_binding_pattern a, %a.param_patt [concrete = constants.%a.patt]
// CHECK:STDOUT: %b.param_patt: %pattern_type.3c8 = value_param_pattern [concrete = constants.%b.param_patt]
// CHECK:STDOUT: %b.patt: %pattern_type.3c8 = wrapper_binding_pattern b, %b.param_patt [concrete = constants.%b.patt]
// CHECK:STDOUT: %c.param_patt: %pattern_type.fcb = value_param_pattern [concrete = constants.%c.param_patt]
// CHECK:STDOUT: %c.patt: %pattern_type.fcb = wrapper_binding_pattern c, %c.param_patt [concrete = constants.%c.patt]
// CHECK:STDOUT: %d.param_patt: %pattern_type.02f = value_param_pattern [concrete = constants.%d.param_patt]
// CHECK:STDOUT: %d.patt: %pattern_type.02f = wrapper_binding_pattern d, %d.param_patt [concrete = constants.%d.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %a.param: %ptr.d43 = value_param call_param0
// CHECK:STDOUT: %.loc33_13: type = splice_block %ptr.loc33_13 [concrete = constants.%ptr.d43] {
// CHECK:STDOUT: %A.ref: type = name_ref A, file.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %ptr.loc33_13: type = ptr_type %A.ref [concrete = constants.%ptr.d43]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %ptr.d43 = wrapper_binding a, %a.param
// CHECK:STDOUT: %b.param: %ptr.432 = value_param call_param1
// CHECK:STDOUT: %.loc33_20: type = splice_block %ptr.loc33_20 [concrete = constants.%ptr.432] {
// CHECK:STDOUT: %B.ref: type = name_ref B, file.%B.decl [concrete = constants.%B]
// CHECK:STDOUT: %ptr.loc33_20: type = ptr_type %B.ref [concrete = constants.%ptr.432]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %ptr.432 = wrapper_binding b, %b.param
// CHECK:STDOUT: %c.param: %ptr.6b6 = value_param call_param2
// CHECK:STDOUT: %.loc33_27: type = splice_block %ptr.loc33_27 [concrete = constants.%ptr.6b6] {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %ptr.loc33_27: type = ptr_type %C.ref [concrete = constants.%ptr.6b6]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %ptr.6b6 = wrapper_binding c, %c.param
// CHECK:STDOUT: %d.param: %ptr.d57 = value_param call_param3
// CHECK:STDOUT: %.loc33_34: type = splice_block %ptr.loc33_34 [concrete = constants.%ptr.d57] {
// CHECK:STDOUT: %D.ref: type = name_ref D, file.%D.decl [concrete = constants.%D]
// CHECK:STDOUT: %ptr.loc33_34: type = ptr_type %D.ref [concrete = constants.%ptr.d57]
// CHECK:STDOUT: }
// CHECK:STDOUT: %d: %ptr.d57 = wrapper_binding d, %d.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @A {
// CHECK:STDOUT: %A.F.decl: %A.F.type = fn_decl @A.F [concrete = constants.%A.F] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.9ef = ref_param_pattern [concrete = constants.%self.param_patt.8fb]
// CHECK:STDOUT: %self.patt: %pattern_type.9ef = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.e64]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %A = ref_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%A [concrete = constants.%A]
// CHECK:STDOUT: %self: ref %A = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%A
// CHECK:STDOUT: .F = %A.F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B {
// CHECK:STDOUT: %A.ref: type = name_ref A, file.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %.loc20: %B.elem = base_decl %A.ref, element0 [concrete]
// CHECK:STDOUT: %B.F.decl: %B.F.type = fn_decl @B.F [concrete = constants.%B.F] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.e39 = ref_param_pattern [concrete = constants.%self.param_patt.039]
// CHECK:STDOUT: %self.patt: %pattern_type.e39 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.535]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %B = ref_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%B [concrete = constants.%B]
// CHECK:STDOUT: %self: ref %B = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%struct_type.base.cb7 [concrete = constants.%complete_type.d5e]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%B
// CHECK:STDOUT: .A = <poisoned>
// CHECK:STDOUT: .base = %.loc20
// CHECK:STDOUT: .F = %B.F.decl
// CHECK:STDOUT: extend %A.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %B.ref: type = name_ref B, file.%B.decl [concrete = constants.%B]
// CHECK:STDOUT: %.loc25: %C.elem = base_decl %B.ref, element0 [concrete]
// CHECK:STDOUT: %C.F.decl: %C.F.type = fn_decl @C.F [concrete = constants.%C.F] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.98b = ref_param_pattern [concrete = constants.%self.param_patt.99a]
// CHECK:STDOUT: %self.patt: %pattern_type.98b = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.cbd]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %C = ref_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %self: ref %C = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%struct_type.base.e05 [concrete = constants.%complete_type.c77]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: .B = <poisoned>
// CHECK:STDOUT: .base = %.loc25
// CHECK:STDOUT: .F = %C.F.decl
// CHECK:STDOUT: extend %B.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @D {
// CHECK:STDOUT: %B.ref: type = name_ref B, file.%B.decl [concrete = constants.%B]
// CHECK:STDOUT: %.loc30: %D.elem = base_decl %B.ref, element0 [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%struct_type.base.e05 [concrete = constants.%complete_type.c77]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%D
// CHECK:STDOUT: .B = <poisoned>
// CHECK:STDOUT: .base = %.loc30
// CHECK:STDOUT: .F = <poisoned>
// CHECK:STDOUT: extend %B.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A.F(%self.param: ref %A);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B.F(%self.param: ref %B);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.F(%self.param: ref %C);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Call(%a.param: %ptr.d43, %b.param: %ptr.432, %c.param: %ptr.6b6, %d.param: %ptr.d57) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %a.ref: %ptr.d43 = name_ref a, %a
// CHECK:STDOUT: %.loc34: ref %A = deref %a.ref
// CHECK:STDOUT: %F.ref.loc34: %A.F.type = name_ref F, @A.%A.F.decl [concrete = constants.%A.F]
// CHECK:STDOUT: %A.F.bound: <bound method> = bound_method %.loc34, %F.ref.loc34
// CHECK:STDOUT: %A.F.call: init %empty_tuple.type = call %A.F.bound(%.loc34)
// CHECK:STDOUT: %b.ref: %ptr.432 = name_ref b, %b
// CHECK:STDOUT: %.loc35: ref %B = deref %b.ref
// CHECK:STDOUT: %F.ref.loc35: %B.F.type = name_ref F, @B.%B.F.decl [concrete = constants.%B.F]
// CHECK:STDOUT: %B.F.bound.loc35: <bound method> = bound_method %.loc35, %F.ref.loc35
// CHECK:STDOUT: %B.F.call.loc35: init %empty_tuple.type = call %B.F.bound.loc35(%.loc35)
// CHECK:STDOUT: %c.ref: %ptr.6b6 = name_ref c, %c
// CHECK:STDOUT: %.loc36: ref %C = deref %c.ref
// CHECK:STDOUT: %F.ref.loc36: %C.F.type = name_ref F, @C.%C.F.decl [concrete = constants.%C.F]
// CHECK:STDOUT: %C.F.bound: <bound method> = bound_method %.loc36, %F.ref.loc36
// CHECK:STDOUT: %C.F.call: init %empty_tuple.type = call %C.F.bound(%.loc36)
// CHECK:STDOUT: %d.ref: %ptr.d57 = name_ref d, %d
// CHECK:STDOUT: %.loc37_4.1: ref %D = deref %d.ref
// CHECK:STDOUT: %F.ref.loc37: %B.F.type = name_ref F, @B.%B.F.decl [concrete = constants.%B.F]
// CHECK:STDOUT: %B.F.bound.loc37: <bound method> = bound_method %.loc37_4.1, %F.ref.loc37
// CHECK:STDOUT: %.loc37_4.2: ref %B = class_element_access %.loc37_4.1, element0
// CHECK:STDOUT: %.loc37_4.3: ref %B = converted %.loc37_4.1, %.loc37_4.2
// CHECK:STDOUT: %B.F.call.loc37: init %empty_tuple.type = call %B.F.bound.loc37(%.loc37_4.3)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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