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carbon-lang/toolchain/lower/testdata/var/param.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/destroy.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/var/param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/var/param.carbon
// --- with_cleanup.carbon
library "[[@TEST_NAME]]";
class C {
// TODO: Change to Core.Destructor when possible.
impl as Core.Destroy {
fn Op(ref self);
}
fn Make() -> Self;
}
fn F(var c: C);
fn G() {
F(C.Make());
}
// --- struct_literal_cleanup.carbon
library "[[@TEST_NAME]]";
class C {
// TODO: Change to Core.Destructor when possible.
impl as Core.Destroy {
fn Op(ref self);
}
}
fn F(var c: C);
fn G() {
F({});
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'with_cleanup.carbon'
// CHECK:STDOUT: source_filename = "with_cleanup.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_COp.C.Main:Destroy.Core"(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CMake.C.Main(ptr sret({}))
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CF.Main(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CG.Main() #0 !dbg !15 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca {}, align 1, !dbg !16
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !16
// CHECK:STDOUT: call void @_CMake.C.Main(ptr %c.var), !dbg !17
// CHECK:STDOUT: call void @_CF.Main(ptr %c.var), !dbg !18
// CHECK:STDOUT: call void @"_COp.08d9e38b928ba575:core.Destroy.Core"(ptr %c.var), !dbg !16
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.08d9e38b928ba575:core.Destroy.Core"(ptr %self) #0 !dbg !20 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !22
// 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: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!7}
// 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: !6 = !DIFile(filename: "with_cleanup.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// 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: !13 = !{null}
// CHECK:STDOUT: !14 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !6, line: 15, type: !14, spFlags: DISPFlagDefinition, unit: !7)
// CHECK:STDOUT: !16 = !DILocation(line: 13, column: 6, scope: !15)
// CHECK:STDOUT: !17 = !DILocation(line: 16, column: 5, scope: !15)
// CHECK:STDOUT: !18 = !DILocation(line: 16, column: 3, scope: !15)
// CHECK:STDOUT: !19 = !DILocation(line: 15, column: 1, scope: !15)
// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "Op", linkageName: "_COp.08d9e38b928ba575:core.Destroy.Core", scope: null, file: !6, line: 13, type: !10, spFlags: DISPFlagDefinition, unit: !7, retainedNodes: !23)
// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !20, type: !8)
// CHECK:STDOUT: !22 = !DILocation(line: 13, column: 6, scope: !20)
// CHECK:STDOUT: !23 = !{!21}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'struct_literal_cleanup.carbon'
// CHECK:STDOUT: source_filename = "struct_literal_cleanup.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc11 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @"_COp.C.Main:Destroy.Core"(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CF.Main(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CG.Main() #0 !dbg !26 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca {}, align 1, !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !27
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %c.var, ptr align 1 @C.val.loc11, i64 0, i1 false), !dbg !27
// CHECK:STDOUT: call void @_CF.Main(ptr %c.var), !dbg !28
// CHECK:STDOUT: call void @"_COp.08d9e38b928ba575:core.Destroy.Core"(ptr %c.var), !dbg !27
// CHECK:STDOUT: ret void, !dbg !29
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.08d9e38b928ba575:core.Destroy.Core"(ptr %self) #0 !dbg !30 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !32
// 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: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// 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 = !{!25}
// 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: !8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !9 = !{null, !8}
// CHECK:STDOUT: !10 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !13 = !{null}
// CHECK:STDOUT: !14 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !24 = !DIFile(filename: "struct_literal_cleanup.carbon", directory: "")
// CHECK:STDOUT: !25 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !24, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !24, line: 13, type: !14, spFlags: DISPFlagDefinition, unit: !25)
// CHECK:STDOUT: !27 = !DILocation(line: 11, column: 6, scope: !26)
// CHECK:STDOUT: !28 = !DILocation(line: 14, column: 3, scope: !26)
// CHECK:STDOUT: !29 = !DILocation(line: 13, column: 1, scope: !26)
// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "Op", linkageName: "_COp.08d9e38b928ba575:core.Destroy.Core", scope: null, file: !24, line: 11, type: !10, spFlags: DISPFlagDefinition, unit: !25, retainedNodes: !33)
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !30, type: !8)
// CHECK:STDOUT: !32 = !DILocation(line: 11, column: 6, scope: !30)
// CHECK:STDOUT: !33 = !{!31}
// CHECK:STDOUT:
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