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Support C++ import for anonymous struct and union members. (#5855)

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This commit is contained in:
Richard Smith
2025-07-28 20:26:24 +00:00
committed by GitHub
parent 5dc299f58b
commit 0d74162e2a
3 changed files with 235 additions and 8 deletions
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toolchain/lower/testdata/interop/cpp/field.carbon
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+63
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@@ -84,6 +84,30 @@ fn AssignM(p: Cpp.A*) {
p->m = 1;
}
// --- anon_union.h
struct A {
int x;
union {
int n;
int *_Nonnull p;
};
};
// --- access_anon_union.carbon
library "[[@TEST_NAME]]";
import Cpp library "anon_union.h";
fn AccessN(a: Cpp.A) -> i32 {
return a.n;
}
fn AccessP(a: Cpp.A) -> i32 {
return *a.p;
}
// CHECK:STDOUT: ; ModuleID = 'access_struct.carbon'
// CHECK:STDOUT: source_filename = "access_struct.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"
@@ -232,3 +256,42 @@ fn AssignM(p: Cpp.A*) {
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AssignM", linkageName: "_CAssignM.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 3, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 10, column: 1, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'access_anon_union.carbon'
// CHECK:STDOUT: source_filename = "access_anon_union.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: define i32 @_CAccessN.Main(ptr %a) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_11.1.n = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !10
// CHECK:STDOUT: %.loc7_11.2 = load i32, ptr %.loc7_11.1.n, align 4, !dbg !10
// CHECK:STDOUT: ret i32 %.loc7_11.2, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @_CAccessP.Main(ptr %a) !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc11_12.1.p = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 8, !dbg !13
// CHECK:STDOUT: %.loc11_12.2 = load ptr, ptr %.loc11_12.1.p, align 8, !dbg !13
// CHECK:STDOUT: %.loc11_10.2 = load i32, ptr %.loc11_12.2, align 4, !dbg !14
// CHECK:STDOUT: ret i32 %.loc11_10.2, !dbg !15
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "access_anon_union.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "AccessN", linkageName: "_CAccessN.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "AccessP", linkageName: "_CAccessP.Main", scope: null, file: !6, line: 10, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !13 = !DILocation(line: 11, column: 11, scope: !12)
// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 10, scope: !12)
// CHECK:STDOUT: !15 = !DILocation(line: 11, column: 3, scope: !12)