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carbon-lang/toolchain/lower/testdata/interop/cpp/issue7142.carbon
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Dana Jansens 4416f3525b Canonicalize generated functions for Core witnesses (#7729) 
Use a single `SemIR::Function` per `Core` interface method, whether it's
generated locally or imported. This prevents generating duplicate
functions, which lead to different types when the witness appears in a
`FacetValue` as part of a specific for a class.

We use a `CanonicalValueStore` of `GeneratedFunction` objects that allow
finding an existing FunctionId for a `Generated` special function before
(re-)generating it. Mangling for `Generated` functions is also moved to
use the values from the `GeneratedFunction`'s canonicalization key, so
that we have a consistent source of truth for the unique ID of a
`Generated` function across all files.

New tests are in
`toolchain/check/testdata/impl/custom_witness/destroy.carbon`.
2026-09-15 16:02:13 +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/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/issue7142.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/issue7142.carbon
import Cpp;
class A { var price: i32; };
fn Get() -> A*;
inline Cpp '''
struct S {
static int Vend() {
return Carbon::Get()->price;
}
};
void f() {
S::Vend();
}
''';
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'issue7142.carbon'
// CHECK:STDOUT: source_filename = "issue7142.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: %"class.Carbon::A" = type { i32 }
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1S4VendEv = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z1fv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %call = call noundef i32 @_ZN1S4VendEv()
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define linkonce_odr dso_local noundef i32 @_ZN1S4VendEv() #0 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %call = call noundef ptr @_ZN6CarbonL3GetEv()
// CHECK:STDOUT: %price = getelementptr inbounds nuw %"class.Carbon::A", ptr %call, i32 0, i32 0
// CHECK:STDOUT: %0 = load i32, ptr %price, align 4, !tbaa !38
// CHECK:STDOUT: ret i32 %0
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_CGet.Main()
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CGet__carbon_thunk.Main(ptr %_) #1 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Get.call = call ptr @_CGet.Main(), !dbg !16
// CHECK:STDOUT: store ptr %Get.call, ptr %_, align 8, !dbg !16
// CHECK:STDOUT: ret void, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_C__destroy_thunk:thunk.A.Main"(ptr %self) #2 !dbg !18 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_COp.5a23cc09585c55d2:core.Destroy.Core"(ptr %self), !dbg !20
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #1 !dbg !22 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.a58e9b74ce410031:core.Destroy.Core"(ptr %self) #1 !dbg !26 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5a23cc09585c55d2:core.Destroy.Core"(ptr %self) #1 !dbg !30 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !32
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal noundef ptr @_ZN6CarbonL3GetEv() #3 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %retval = alloca ptr, align 8
// CHECK:STDOUT: call void @_CGet__carbon_thunk.Main(ptr noundef nonnull align 8 dereferenceable(8) %retval)
// CHECK:STDOUT: %0 = load ptr, ptr %retval, align 8
// CHECK:STDOUT: ret ptr %0
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { nounwind }
// CHECK:STDOUT: attributes #2 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #3 = { alwaysinline mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.module.flags = !{!41, !42, !43, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!45}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !4 = !DIFile(filename: "issue7142.carbon", directory: "")
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !10 = !{null, !7}
// CHECK:STDOUT: !11 = !DISubroutineType(types: !10)
// CHECK:STDOUT: !12 = !{null, !6}
// CHECK:STDOUT: !13 = !DISubroutineType(types: !12)
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "Get__carbon_thunk", linkageName: "_CGet__carbon_thunk.Main", scope: null, file: !4, line: 16, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !17)
// CHECK:STDOUT: !15 = !DILocalVariable(arg: 1, scope: !14, type: !7)
// CHECK:STDOUT: !16 = !DILocation(line: 16, column: 1, scope: !14)
// CHECK:STDOUT: !17 = !{!15}
// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "__destroy_thunk", linkageName: "_C__destroy_thunk:thunk.A.Main", scope: null, file: !4, line: 15, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !21)
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !18, type: !7)
// CHECK:STDOUT: !20 = !DILocation(line: 15, column: 1, scope: !18)
// CHECK:STDOUT: !21 = !{!19}
// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !4, line: 15, type: !13, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !25)
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !22, type: !6)
// CHECK:STDOUT: !24 = !DILocation(line: 15, column: 1, scope: !22)
// CHECK:STDOUT: !25 = !{!23}
// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "Op", linkageName: "_COp.a58e9b74ce410031:core.Destroy.Core", scope: null, file: !4, line: 15, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !29)
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !26, type: !7)
// CHECK:STDOUT: !28 = !DILocation(line: 15, column: 1, scope: !26)
// CHECK:STDOUT: !29 = !{!27}
// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5a23cc09585c55d2:core.Destroy.Core", scope: null, file: !4, line: 15, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !33)
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !30, type: !7)
// CHECK:STDOUT: !32 = !DILocation(line: 15, column: 1, scope: !30)
// CHECK:STDOUT: !33 = !{!31}
// CHECK:STDOUT: !34 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !35 = !{!"omnipotent char", !34, i64 0}
// CHECK:STDOUT: !36 = !{!"int", !35, i64 0}
// CHECK:STDOUT: !37 = !{!"_ZTSN6Carbon1AE", !36, i64 0}
// CHECK:STDOUT: !38 = !{!37, !36, i64 0}
// CHECK:STDOUT: !41 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !42 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !43 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !44 = !{!"__libc_errno", !36, i64 0}
// CHECK:STDOUT: !45 = !{!44, !36, i64 0}
// CHECK:STDOUT:
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