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carbon-lang/toolchain/lower/testdata/builtins/cpp.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/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/builtins/cpp.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/builtins/cpp.carbon
// --- std_initializer_list_make.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
template<typename T>
struct InitializerListPointerPointer {
T* begin;
T* end;
};
template<typename T>
struct InitializerListPointerSize {
T* begin;
decltype(sizeof(T)) size;
};
''';
fn MakePointerPointer(a: array(i32, 4)) -> Cpp.InitializerListPointerPointer(i32) = "cpp.std.initializer_list.make";
fn MakePointerSize(a: array(i32, 4)) -> Cpp.InitializerListPointerSize(i32) = "cpp.std.initializer_list.make";
fn TakePointerPointer(a: Cpp.InitializerListPointerPointer(i32));
fn TakePointerSize(a: Cpp.InitializerListPointerSize(i32));
fn Test() {
TakePointerPointer(MakePointerPointer((1, 2, 3, 4)));
TakePointerSize(MakePointerSize((1, 2, 3, 4)));
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'std_initializer_list_make.carbon'
// CHECK:STDOUT: source_filename = "std_initializer_list_make.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: @array = internal constant [4 x i32] [i32 1, i32 2, i32 3, i32 4]
// CHECK:STDOUT: @array.loc25_52.18 = internal constant [4 x i32] [i32 1, i32 2, i32 3, i32 4]
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CTakePointerPointer.Main(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CTakePointerSize.Main(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CTest.Main() #0 !dbg !15 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc25_53.1.temp = alloca [16 x i8], align 8, !dbg !16
// CHECK:STDOUT: %.loc25_52.3.temp = alloca [4 x i32], align 4, !dbg !17
// CHECK:STDOUT: %.loc26_47.1.temp = alloca [16 x i8], align 8, !dbg !19
// CHECK:STDOUT: %.loc26_46.3.temp = alloca [4 x i32], align 4, !dbg !20
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_53.1.temp), !dbg !16
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_52.3.temp), !dbg !17
// CHECK:STDOUT: %.loc25_52.4.array.index = getelementptr inbounds [4 x i32], ptr %.loc25_52.3.temp, i32 0, i64 0, !dbg !17
// CHECK:STDOUT: %.loc25_52.7.array.index = getelementptr inbounds [4 x i32], ptr %.loc25_52.3.temp, i32 0, i64 1, !dbg !17
// CHECK:STDOUT: %.loc25_52.10.array.index = getelementptr inbounds [4 x i32], ptr %.loc25_52.3.temp, i32 0, i64 2, !dbg !17
// CHECK:STDOUT: %.loc25_52.13.array.index = getelementptr inbounds [4 x i32], ptr %.loc25_52.3.temp, i32 0, i64 3, !dbg !17
// CHECK:STDOUT: %MakePointerPointer.call.init_list.begin = getelementptr inbounds nuw [16 x i8], ptr %.loc25_53.1.temp, i32 0, i32 0, !dbg !16
// CHECK:STDOUT: store ptr @array.loc25_52.18, ptr %MakePointerPointer.call.init_list.begin, align 8, !dbg !16
// CHECK:STDOUT: %MakePointerPointer.call.init_list.end = getelementptr inbounds nuw [16 x i8], ptr %.loc25_53.1.temp, i32 0, i32 8, !dbg !16
// CHECK:STDOUT: store ptr getelementptr inbounds ([4 x i32], ptr @array.loc25_52.18, i32 1), ptr %MakePointerPointer.call.init_list.end, align 8, !dbg !16
// CHECK:STDOUT: call void @_CTakePointerPointer.Main(ptr %.loc25_53.1.temp), !dbg !18
// CHECK:STDOUT: call void @"_COp.88cc3346b7991af5:core.Destroy.Core"(ptr @array), !dbg !17
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc26_47.1.temp), !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc26_46.3.temp), !dbg !20
// CHECK:STDOUT: %.loc26_46.4.array.index = getelementptr inbounds [4 x i32], ptr %.loc26_46.3.temp, i32 0, i64 0, !dbg !20
// CHECK:STDOUT: %.loc26_46.7.array.index = getelementptr inbounds [4 x i32], ptr %.loc26_46.3.temp, i32 0, i64 1, !dbg !20
// CHECK:STDOUT: %.loc26_46.10.array.index = getelementptr inbounds [4 x i32], ptr %.loc26_46.3.temp, i32 0, i64 2, !dbg !20
// CHECK:STDOUT: %.loc26_46.13.array.index = getelementptr inbounds [4 x i32], ptr %.loc26_46.3.temp, i32 0, i64 3, !dbg !20
// CHECK:STDOUT: %MakePointerSize.call.init_list.begin = getelementptr inbounds nuw [16 x i8], ptr %.loc26_47.1.temp, i32 0, i32 0, !dbg !19
// CHECK:STDOUT: store ptr @array.loc25_52.18, ptr %MakePointerSize.call.init_list.begin, align 8, !dbg !19
// CHECK:STDOUT: %MakePointerSize.call.init_list.size = getelementptr inbounds nuw [16 x i8], ptr %.loc26_47.1.temp, i32 0, i32 8, !dbg !19
// CHECK:STDOUT: store i64 4, ptr %MakePointerSize.call.init_list.size, align 8, !dbg !19
// CHECK:STDOUT: call void @_CTakePointerSize.Main(ptr %.loc26_47.1.temp), !dbg !21
// CHECK:STDOUT: call void @"_COp.88cc3346b7991af5:core.Destroy.Core"(ptr @array), !dbg !20
// CHECK:STDOUT: ret void, !dbg !22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !23 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !25
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.88cc3346b7991af5:core.Destroy.Core"(ptr %self) #0 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !29
// 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.88cc3346b7991af5:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 3, 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 = !{!5}
// CHECK:STDOUT: !llvm.module.flags = !{!31, !32, !33, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!38}
// 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: "std_initializer_list_make.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: !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !9 = !{null, !8}
// CHECK:STDOUT: !10 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !11 = !{null}
// CHECK:STDOUT: !12 = !DISubroutineType(types: !11)
// CHECK:STDOUT: !13 = !{null, !6}
// CHECK:STDOUT: !14 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !4, line: 24, type: !12, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !16 = !DILocation(line: 25, column: 22, scope: !15)
// CHECK:STDOUT: !17 = !DILocation(line: 25, column: 41, scope: !15)
// CHECK:STDOUT: !18 = !DILocation(line: 25, column: 3, scope: !15)
// CHECK:STDOUT: !19 = !DILocation(line: 26, column: 19, scope: !15)
// CHECK:STDOUT: !20 = !DILocation(line: 26, column: 35, scope: !15)
// CHECK:STDOUT: !21 = !DILocation(line: 26, column: 3, scope: !15)
// CHECK:STDOUT: !22 = !DILocation(line: 24, column: 1, scope: !15)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !4, line: 25, type: !14, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !26)
// CHECK:STDOUT: !24 = !DILocalVariable(arg: 1, scope: !23, type: !6)
// CHECK:STDOUT: !25 = !DILocation(line: 25, column: 41, scope: !23)
// CHECK:STDOUT: !26 = !{!24}
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "Op", linkageName: "_COp.88cc3346b7991af5:core.Destroy.Core", scope: null, file: !4, line: 25, type: !10, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !30)
// CHECK:STDOUT: !28 = !DILocalVariable(arg: 1, scope: !27, type: !8)
// CHECK:STDOUT: !29 = !DILocation(line: 25, column: 41, scope: !27)
// CHECK:STDOUT: !30 = !{!28}
// CHECK:STDOUT: !31 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !32 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !33 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !34 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !35 = !{!"omnipotent char", !34, i64 0}
// CHECK:STDOUT: !36 = !{!"int", !35, i64 0}
// CHECK:STDOUT: !37 = !{!"__libc_errno", !36, i64 0}
// CHECK:STDOUT: !38 = !{!37, !36, i64 0}
// CHECK:STDOUT:
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