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Add support for exporting Carbon functions as constructors. (#7560)

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Co-authored-by: Nicholas Bishop <nbishop@nbishop.net>
This commit is contained in:
Geoff Romer
2026-07-24 18:43:12 +00:00
committed by GitHub
co-authored by Nicholas Bishop
parent de68b19784
commit 3cb143e878
7 changed files with 576 additions and 100 deletions
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toolchain/lower/testdata/interop/cpp/function/export/constructor.carbon
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+146
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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/function/export/constructor.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/function/export/constructor.carbon
// --- call_constructor.carbon
library "[[@TEST_NAME]]";
import Cpp;
class OneArg {
fn OneArg(i: i32) -> Self;
}
inline Cpp '''
void f() {
Carbon::OneArg a(42);
}
''';
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'call_constructor.carbon'
// CHECK:STDOUT: source_filename = "call_constructor.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::OneArg" = type {}
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon6OneArgD2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z1fv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a = alloca %"class.Carbon::OneArg", align 1
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a) #5
// CHECK:STDOUT: call void @_ZN6Carbon6OneArgC2Ei(ptr noundef nonnull align 1 %a, i32 noundef 42)
// CHECK:STDOUT: call void @_ZN6Carbon6OneArgD2Ev(ptr noundef nonnull align 1 %a) #5
// CHECK:STDOUT: call void @llvm.lifetime.end.p0(ptr %a) #5
// CHECK:STDOUT: ret void
// 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: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN6Carbon6OneArgC2Ei(ptr noundef nonnull align 1 %this, i32 noundef %0) unnamed_addr #2 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: %.addr = alloca i32, align 4
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !12
// CHECK:STDOUT: store i32 %0, ptr %.addr, align 4, !tbaa !15
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_COneArg__carbon_thunk.OneArg.Main(ptr noundef nonnull align 1 %this1, ptr noundef nonnull align 4 dereferenceable(4) %.addr)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon6OneArgD2Ev(ptr noundef nonnull align 1 %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !12
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @"_C__destroy_thunk:thunk.OneArg.Main"(ptr noundef nonnull align 1 %this1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.end.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_COneArg.OneArg.Main(ptr sret({}), i32)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_C__destroy_thunk:thunk.OneArg.Main"(ptr %self) #4 !dbg !16 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_COp.00865f7eeafb4c4e:core.Destroy.Core"(ptr %self), !dbg !22
// CHECK:STDOUT: ret void, !dbg !22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.00865f7eeafb4c4e:core.Destroy.Core"(ptr %self) #5 !dbg !23 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !26
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_COneArg__carbon_thunk.OneArg.Main(ptr %_, ptr %_1) #5 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc6_28.2 = load i32, ptr %_1, align 4, !dbg !34
// CHECK:STDOUT: call void @_COneArg.OneArg.Main(ptr %_, i32 %.loc6_28.2), !dbg !34
// CHECK:STDOUT: ret void, !dbg !34
// 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { 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: attributes #3 = { inlinehint 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: attributes #4 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #5 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3, !4, !5, !6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "call_constructor.carbon", directory: "")
// CHECK:STDOUT: !2 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !6 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !7 = !{!8, !9, i64 0}
// CHECK:STDOUT: !8 = !{!"__libc_errno", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = !{!13, !13, i64 0}
// CHECK:STDOUT: !13 = !{!"p1 _ZTSN6Carbon6OneArgE", !14, i64 0}
// CHECK:STDOUT: !14 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !15 = !{!9, !9, i64 0}
// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "__destroy_thunk", linkageName: "_C__destroy_thunk:thunk.OneArg.Main", scope: null, file: !1, line: 5, type: !17, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !20)
// CHECK:STDOUT: !17 = !DISubroutineType(types: !18)
// CHECK:STDOUT: !18 = !{null, !19}
// CHECK:STDOUT: !19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !20 = !{!21}
// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !16, type: !19)
// CHECK:STDOUT: !22 = !DILocation(line: 5, column: 1, scope: !16)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "Op", linkageName: "_COp.00865f7eeafb4c4e:core.Destroy.Core", scope: null, file: !1, line: 5, type: !17, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !24)
// CHECK:STDOUT: !24 = !{!25}
// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !23, type: !19)
// CHECK:STDOUT: !26 = !DILocation(line: 5, column: 1, scope: !23)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "OneArg__carbon_thunk", linkageName: "_COneArg__carbon_thunk.OneArg.Main", scope: null, file: !1, line: 6, type: !28, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !31)
// CHECK:STDOUT: !28 = !DISubroutineType(types: !29)
// CHECK:STDOUT: !29 = !{null, !19, !30}
// CHECK:STDOUT: !30 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !31 = !{!32, !33}
// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !27, type: !19)
// CHECK:STDOUT: !33 = !DILocalVariable(arg: 2, scope: !27, type: !30)
// CHECK:STDOUT: !34 = !DILocation(line: 6, column: 3, scope: !27)
// CHECK:STDOUT: