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carbon-lang/toolchain/lower/testdata/impl/import_thunk.carbon
T
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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/impl/import_thunk.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/impl/import_thunk.carbon
// --- thunk.carbon
library "[[@TEST_NAME]]";
class A { var a: i32; }
class B { var b: i32; }
class C { var c: i32; }
impl A as Core.ImplicitAs(B) {
fn Convert(self: A) -> B { return {.b = self.a}; }
}
impl B as Core.ImplicitAs(C) {
fn Convert(self: B) -> C { return {.c = self.b}; }
}
interface I {
fn F(a: A) -> C;
}
impl () as I {
fn F(b: B) -> B { return {.b = b.b}; }
}
// --- call_thunk.carbon
library "[[@TEST_NAME]]";
import library "thunk";
fn Test(a: A) -> C {
return ().(I.F)(a);
}
// --- thunk_for_imported_interface.carbon
library "[[@TEST_NAME]]";
import library "thunk";
class X {}
impl X as I {
fn F(b: B) -> B { return {.b = b.b}; }
}
// --- call_thunk_for_imported_interface.carbon
library "[[@TEST_NAME]]";
import library "thunk";
import library "thunk_for_imported_interface";
fn Test(a: A) -> C {
return X.(I.F)(a);
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'thunk.carbon'
// CHECK:STDOUT: source_filename = "thunk.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr sret({ i32 }) %return, ptr %self) #0 !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_47.1.a = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !33
// CHECK:STDOUT: %.loc9_47.2 = load i32, ptr %.loc9_47.1.a, align 4, !dbg !33
// CHECK:STDOUT: %.loc9_49.2.b = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !34
// CHECK:STDOUT: store i32 %.loc9_47.2, ptr %.loc9_49.2.b, align 4, !dbg !34
// CHECK:STDOUT: ret void, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr sret({ i32 }) %return, ptr %self) #0 !dbg !37 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_47.1.b = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !42
// CHECK:STDOUT: %.loc12_47.2 = load i32, ptr %.loc12_47.1.b, align 4, !dbg !42
// CHECK:STDOUT: %.loc12_49.2.c = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !43
// CHECK:STDOUT: store i32 %.loc12_47.2, ptr %.loc12_49.2.c, align 4, !dbg !43
// CHECK:STDOUT: ret void, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }) %return, ptr %b) #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc20_35.1.b = getelementptr inbounds nuw { i32 }, ptr %b, i32 0, i32 0, !dbg !51
// CHECK:STDOUT: %.loc20_35.2 = load i32, ptr %.loc20_35.1.b, align 4, !dbg !51
// CHECK:STDOUT: %.loc20_37.2.b = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !52
// CHECK:STDOUT: store i32 %.loc20_35.2, ptr %.loc20_37.2.b, align 4, !dbg !52
// CHECK:STDOUT: ret void, !dbg !53
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_CF:thunk:I.6a2feaaa6331eb92.Main:61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }) %return, ptr %a) #1 !dbg !55 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc20_19.1.temp = alloca { i32 }, align 4, !dbg !58
// CHECK:STDOUT: %.4.temp = alloca { i32 }, align 4, !dbg !57
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc20_19.1.temp), !dbg !58
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.4.temp), !dbg !57
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr %.4.temp, ptr %a), !dbg !57
// CHECK:STDOUT: call void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr %.loc20_19.1.temp, ptr %.4.temp), !dbg !58
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr %return, ptr %.loc20_19.1.temp), !dbg !58
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc20_19.1.temp), !dbg !58
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.4.temp), !dbg !57
// CHECK:STDOUT: ret void, !dbg !58
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !60 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !62
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.0bfe8bb35a2876b2:core.Destroy.Core"(ptr %self) #0 !dbg !64 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !66
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %self) #0 !dbg !68 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !70
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.8c4b83ecd900f1ea:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!19}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !18 = !DIFile(filename: "thunk.carbon", directory: "")
// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!21, !21}
// CHECK:STDOUT: !23 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !24 = !{null, !20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !21}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core", scope: null, file: !18, line: 9, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !36)
// CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !28, type: !21)
// CHECK:STDOUT: !33 = !DILocation(line: 9, column: 43, scope: !28)
// CHECK:STDOUT: !34 = !DILocation(line: 9, column: 37, scope: !28)
// CHECK:STDOUT: !35 = !DILocation(line: 9, column: 30, scope: !28)
// CHECK:STDOUT: !36 = !{!29}
// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core", scope: null, file: !18, line: 12, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !45)
// CHECK:STDOUT: !38 = !DILocalVariable(arg: 1, scope: !37, type: !21)
// CHECK:STDOUT: !42 = !DILocation(line: 12, column: 43, scope: !37)
// CHECK:STDOUT: !43 = !DILocation(line: 12, column: 37, scope: !37)
// CHECK:STDOUT: !44 = !DILocation(line: 12, column: 30, scope: !37)
// CHECK:STDOUT: !45 = !{!38}
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "F", linkageName: "_CF.61ea2aba74ab3bf1:I.Main", scope: null, file: !18, line: 20, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !54)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !46, type: !21)
// CHECK:STDOUT: !51 = !DILocation(line: 20, column: 34, scope: !46)
// CHECK:STDOUT: !52 = !DILocation(line: 20, column: 28, scope: !46)
// CHECK:STDOUT: !53 = !DILocation(line: 20, column: 21, scope: !46)
// CHECK:STDOUT: !54 = !{!47}
// CHECK:STDOUT: !55 = distinct !DISubprogram(name: "F", linkageName: "_CF:thunk:I.6a2feaaa6331eb92.Main:61ea2aba74ab3bf1:I.Main", scope: null, file: !18, line: 20, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !59)
// CHECK:STDOUT: !56 = !DILocalVariable(arg: 1, scope: !55, type: !21)
// CHECK:STDOUT: !57 = !DILocation(line: 0, scope: !55)
// CHECK:STDOUT: !58 = !DILocation(line: 20, column: 3, scope: !55)
// CHECK:STDOUT: !59 = !{!56}
// CHECK:STDOUT: !60 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !18, line: 20, type: !25, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !63)
// CHECK:STDOUT: !61 = !DILocalVariable(arg: 1, scope: !60, type: !20)
// CHECK:STDOUT: !62 = !DILocation(line: 20, column: 3, scope: !60)
// CHECK:STDOUT: !63 = !{!61}
// CHECK:STDOUT: !64 = distinct !DISubprogram(name: "Op", linkageName: "_COp.0bfe8bb35a2876b2:core.Destroy.Core", scope: null, file: !18, line: 20, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !67)
// CHECK:STDOUT: !65 = !DILocalVariable(arg: 1, scope: !64, type: !21)
// CHECK:STDOUT: !66 = !DILocation(line: 20, column: 3, scope: !64)
// CHECK:STDOUT: !67 = !{!65}
// CHECK:STDOUT: !68 = distinct !DISubprogram(name: "Op", linkageName: "_COp.8c4b83ecd900f1ea:core.Destroy.Core", scope: null, file: !18, line: 20, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !71)
// CHECK:STDOUT: !69 = !DILocalVariable(arg: 1, scope: !68, type: !21)
// CHECK:STDOUT: !70 = !DILocation(line: 20, column: 3, scope: !68)
// CHECK:STDOUT: !71 = !{!69}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'call_thunk.carbon'
// CHECK:STDOUT: source_filename = "call_thunk.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CTest.Main(ptr sret({ i32 }) %return, ptr %a) #0 !dbg !74 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_20.1.temp = alloca { i32 }, align 4, !dbg !80
// CHECK:STDOUT: %.loc7_20.2.temp = alloca { i32 }, align 4, !dbg !80
// CHECK:STDOUT: %.loc7_19.1.temp = alloca { i32 }, align 4, !dbg !79
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc7_20.1.temp), !dbg !80
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc7_20.2.temp), !dbg !80
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc7_19.1.temp), !dbg !79
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr %.loc7_19.1.temp, ptr %a), !dbg !79
// CHECK:STDOUT: call void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr %.loc7_20.2.temp, ptr %.loc7_19.1.temp), !dbg !80
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr %return, ptr %.loc7_20.2.temp), !dbg !81
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc7_20.2.temp), !dbg !80
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc7_19.1.temp), !dbg !79
// CHECK:STDOUT: ret void, !dbg !81
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CF:thunk:I.f5faeaa774ca256e.Main:61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !83 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !85
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.0bfe8bb35a2876b2:core.Destroy.Core"(ptr %self) #0 !dbg !87 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !89
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %self) #0 !dbg !91 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !93
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.8c4b83ecd900f1ea:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!73}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!21, !21}
// CHECK:STDOUT: !23 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !24 = !{null, !20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !21}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !72 = !DIFile(filename: "call_thunk.carbon", directory: "")
// CHECK:STDOUT: !73 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !72, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !74 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !72, line: 6, type: !23, spFlags: DISPFlagDefinition, unit: !73, retainedNodes: !82)
// CHECK:STDOUT: !75 = !DILocalVariable(arg: 1, scope: !74, type: !21)
// CHECK:STDOUT: !79 = !DILocation(line: 7, column: 19, scope: !74)
// CHECK:STDOUT: !80 = !DILocation(line: 7, column: 10, scope: !74)
// CHECK:STDOUT: !81 = !DILocation(line: 7, column: 3, scope: !74)
// CHECK:STDOUT: !82 = !{!75}
// CHECK:STDOUT: !83 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !72, line: 7, type: !25, spFlags: DISPFlagDefinition, unit: !73, retainedNodes: !86)
// CHECK:STDOUT: !84 = !DILocalVariable(arg: 1, scope: !83, type: !20)
// CHECK:STDOUT: !85 = !DILocation(line: 7, column: 10, scope: !83)
// CHECK:STDOUT: !86 = !{!84}
// CHECK:STDOUT: !87 = distinct !DISubprogram(name: "Op", linkageName: "_COp.0bfe8bb35a2876b2:core.Destroy.Core", scope: null, file: !72, line: 7, type: !27, spFlags: DISPFlagDefinition, unit: !73, retainedNodes: !90)
// CHECK:STDOUT: !88 = !DILocalVariable(arg: 1, scope: !87, type: !21)
// CHECK:STDOUT: !89 = !DILocation(line: 7, column: 10, scope: !87)
// CHECK:STDOUT: !90 = !{!88}
// CHECK:STDOUT: !91 = distinct !DISubprogram(name: "Op", linkageName: "_COp.8c4b83ecd900f1ea:core.Destroy.Core", scope: null, file: !72, line: 7, type: !27, spFlags: DISPFlagDefinition, unit: !73, retainedNodes: !94)
// CHECK:STDOUT: !92 = !DILocalVariable(arg: 1, scope: !91, type: !21)
// CHECK:STDOUT: !93 = !DILocation(line: 7, column: 10, scope: !91)
// CHECK:STDOUT: !94 = !{!92}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'thunk_for_imported_interface.carbon'
// CHECK:STDOUT: source_filename = "thunk_for_imported_interface.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CF.X.Main:I.Main"(ptr sret({ i32 }) %return, ptr %b) #0 !dbg !97 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_35.1.b = getelementptr inbounds nuw { i32 }, ptr %b, i32 0, i32 0, !dbg !102
// CHECK:STDOUT: %.loc9_35.2 = load i32, ptr %.loc9_35.1.b, align 4, !dbg !102
// CHECK:STDOUT: %.loc9_37.2.b = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !103
// CHECK:STDOUT: store i32 %.loc9_35.2, ptr %.loc9_37.2.b, align 4, !dbg !103
// CHECK:STDOUT: ret void, !dbg !104
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_CF:thunk:I.d0cc85b6c89517e3.Main:X.Main:I.Main"(ptr sret({ i32 }) %return, ptr %a) #1 !dbg !106 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_19.1.temp = alloca { i32 }, align 4, !dbg !109
// CHECK:STDOUT: %.4.temp = alloca { i32 }, align 4, !dbg !108
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc9_19.1.temp), !dbg !109
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.4.temp), !dbg !108
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr %.4.temp, ptr %a), !dbg !108
// CHECK:STDOUT: call void @"_CF.X.Main:I.Main"(ptr %.loc9_19.1.temp, ptr %.4.temp), !dbg !109
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr %return, ptr %.loc9_19.1.temp), !dbg !109
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc9_19.1.temp), !dbg !109
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.4.temp), !dbg !108
// CHECK:STDOUT: ret void, !dbg !109
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !111 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !113
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.0bfe8bb35a2876b2:core.Destroy.Core"(ptr %self) #0 !dbg !115 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !117
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %self) #0 !dbg !119 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !121
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.8c4b83ecd900f1ea:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!96}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!21, !21}
// CHECK:STDOUT: !23 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !24 = !{null, !20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !21}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !95 = !DIFile(filename: "thunk_for_imported_interface.carbon", directory: "")
// CHECK:STDOUT: !96 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !95, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !97 = distinct !DISubprogram(name: "F", linkageName: "_CF.X.Main:I.Main", scope: null, file: !95, line: 9, type: !23, spFlags: DISPFlagDefinition, unit: !96, retainedNodes: !105)
// CHECK:STDOUT: !98 = !DILocalVariable(arg: 1, scope: !97, type: !21)
// CHECK:STDOUT: !102 = !DILocation(line: 9, column: 34, scope: !97)
// CHECK:STDOUT: !103 = !DILocation(line: 9, column: 28, scope: !97)
// CHECK:STDOUT: !104 = !DILocation(line: 9, column: 21, scope: !97)
// CHECK:STDOUT: !105 = !{!98}
// CHECK:STDOUT: !106 = distinct !DISubprogram(name: "F", linkageName: "_CF:thunk:I.d0cc85b6c89517e3.Main:X.Main:I.Main", scope: null, file: !95, line: 9, type: !23, spFlags: DISPFlagDefinition, unit: !96, retainedNodes: !110)
// CHECK:STDOUT: !107 = !DILocalVariable(arg: 1, scope: !106, type: !21)
// CHECK:STDOUT: !108 = !DILocation(line: 0, scope: !106)
// CHECK:STDOUT: !109 = !DILocation(line: 9, column: 3, scope: !106)
// CHECK:STDOUT: !110 = !{!107}
// CHECK:STDOUT: !111 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !95, line: 9, type: !25, spFlags: DISPFlagDefinition, unit: !96, retainedNodes: !114)
// CHECK:STDOUT: !112 = !DILocalVariable(arg: 1, scope: !111, type: !20)
// CHECK:STDOUT: !113 = !DILocation(line: 9, column: 3, scope: !111)
// CHECK:STDOUT: !114 = !{!112}
// CHECK:STDOUT: !115 = distinct !DISubprogram(name: "Op", linkageName: "_COp.0bfe8bb35a2876b2:core.Destroy.Core", scope: null, file: !95, line: 9, type: !27, spFlags: DISPFlagDefinition, unit: !96, retainedNodes: !118)
// CHECK:STDOUT: !116 = !DILocalVariable(arg: 1, scope: !115, type: !21)
// CHECK:STDOUT: !117 = !DILocation(line: 9, column: 3, scope: !115)
// CHECK:STDOUT: !118 = !{!116}
// CHECK:STDOUT: !119 = distinct !DISubprogram(name: "Op", linkageName: "_COp.8c4b83ecd900f1ea:core.Destroy.Core", scope: null, file: !95, line: 9, type: !27, spFlags: DISPFlagDefinition, unit: !96, retainedNodes: !122)
// CHECK:STDOUT: !120 = !DILocalVariable(arg: 1, scope: !119, type: !21)
// CHECK:STDOUT: !121 = !DILocation(line: 9, column: 3, scope: !119)
// CHECK:STDOUT: !122 = !{!120}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'call_thunk_for_imported_interface.carbon'
// CHECK:STDOUT: source_filename = "call_thunk_for_imported_interface.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CTest.Main(ptr sret({ i32 }) %return, ptr %a) #0 !dbg !125 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc8_19.1.temp = alloca { i32 }, align 4, !dbg !131
// CHECK:STDOUT: %.loc8_19.2.temp = alloca { i32 }, align 4, !dbg !131
// CHECK:STDOUT: %.loc8_18.1.temp = alloca { i32 }, align 4, !dbg !130
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc8_19.1.temp), !dbg !131
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc8_19.2.temp), !dbg !131
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc8_18.1.temp), !dbg !130
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr %.loc8_18.1.temp, ptr %a), !dbg !130
// CHECK:STDOUT: call void @"_CF.X.Main:I.Main"(ptr %.loc8_19.2.temp, ptr %.loc8_18.1.temp), !dbg !131
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr %return, ptr %.loc8_19.2.temp), !dbg !132
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc8_19.2.temp), !dbg !131
// CHECK:STDOUT: call void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %.loc8_18.1.temp), !dbg !130
// CHECK:STDOUT: ret void, !dbg !132
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CF:thunk:I.4980a17f6b368c72.Main:X.Main:I.Main"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CF.X.Main:I.Main"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.A.Main:ImplicitAs.a6a60dfee2d7d273.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_CConvert.B.Main:ImplicitAs.9522ff908e97e267.Core"(ptr sret({ i32 }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !134 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !136
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.0bfe8bb35a2876b2:core.Destroy.Core"(ptr %self) #0 !dbg !138 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !140
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.8c4b83ecd900f1ea:core.Destroy.Core"(ptr %self) #0 !dbg !142 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !144
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.8c4b83ecd900f1ea:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!124}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!21, !21}
// CHECK:STDOUT: !23 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !24 = !{null, !20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !21}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !123 = !DIFile(filename: "call_thunk_for_imported_interface.carbon", directory: "")
// CHECK:STDOUT: !124 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !123, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !125 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !123, line: 7, type: !23, spFlags: DISPFlagDefinition, unit: !124, retainedNodes: !133)
// CHECK:STDOUT: !126 = !DILocalVariable(arg: 1, scope: !125, type: !21)
// CHECK:STDOUT: !130 = !DILocation(line: 8, column: 18, scope: !125)
// CHECK:STDOUT: !131 = !DILocation(line: 8, column: 10, scope: !125)
// CHECK:STDOUT: !132 = !DILocation(line: 8, column: 3, scope: !125)
// CHECK:STDOUT: !133 = !{!126}
// CHECK:STDOUT: !134 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !123, line: 8, type: !25, spFlags: DISPFlagDefinition, unit: !124, retainedNodes: !137)
// CHECK:STDOUT: !135 = !DILocalVariable(arg: 1, scope: !134, type: !20)
// CHECK:STDOUT: !136 = !DILocation(line: 8, column: 10, scope: !134)
// CHECK:STDOUT: !137 = !{!135}
// CHECK:STDOUT: !138 = distinct !DISubprogram(name: "Op", linkageName: "_COp.0bfe8bb35a2876b2:core.Destroy.Core", scope: null, file: !123, line: 8, type: !27, spFlags: DISPFlagDefinition, unit: !124, retainedNodes: !141)
// CHECK:STDOUT: !139 = !DILocalVariable(arg: 1, scope: !138, type: !21)
// CHECK:STDOUT: !140 = !DILocation(line: 8, column: 10, scope: !138)
// CHECK:STDOUT: !141 = !{!139}
// CHECK:STDOUT: !142 = distinct !DISubprogram(name: "Op", linkageName: "_COp.8c4b83ecd900f1ea:core.Destroy.Core", scope: null, file: !123, line: 8, type: !27, spFlags: DISPFlagDefinition, unit: !124, retainedNodes: !145)
// CHECK:STDOUT: !143 = !DILocalVariable(arg: 1, scope: !142, type: !21)
// CHECK:STDOUT: !144 = !DILocation(line: 8, column: 10, scope: !142)
// CHECK:STDOUT: !145 = !{!143}
// CHECK:STDOUT:
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