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carbon-lang/toolchain/lower/testdata/interop/cpp/class/import/alignment.carbon
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Richard Smith cefa0397bb More fixes to package and library fingerprinting. (#7297) 
Fix import logic to make all imported packages be children of the
`NameScopeId::Package` scope. Previously, indirectly-imported packages
would end up as children of their importing package's scope, which
resulted in them not being treated as packages at all, and in particular
not being fingerprinted as packages.

Fixing that caused a failure in the fingerprinting logic as we started
to encounter packages with no correspoding import scopes. Instead of
looking for import scopes, use a simpler mechanism to map packages to
their package names, and clean up.

Unfortunately the latter change churns all the fingerprints again :(
Hopefully this is the last time for a while.
2026-06-04 17:41:46 +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/primitives.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/class/import/alignment.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/class/import/alignment.carbon
// --- alignment.carbon
library "[[@TEST_NAME]]";
import Cpp;
inline Cpp '''
struct NaturallyAligned {
int n;
};
struct alignas(16) ExtraAlignment {
int n;
};
struct __attribute__((packed)) Packed {
int n;
};
template<typename T>
void Take(T&);
''';
fn NaturallyAligned(n: i32) {
var a: Cpp.NaturallyAligned;
a.n = n;
Cpp.Take(ref a);
}
fn ExtraAlignment(n: i32) {
var a: Cpp.ExtraAlignment;
// TODO: We only specify a 4-byte alignment here, although we know that `a.n`
// has more alignment.
a.n = n;
Cpp.Take(ref a);
}
fn Packed(n: i32) {
var a: Cpp.Packed;
// TODO: We incorrectly specify a 4-byte alignment here. We may need to give
// underaligned fields a different type in order to prevent miscompiling code
// like this.
a.n = n;
Cpp.Take(ref a);
}
// CHECK:STDOUT: ; ModuleID = 'alignment.carbon'
// CHECK:STDOUT: source_filename = "alignment.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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CNaturallyAligned.Main(i32 %n) #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca [4 x i8], align 4, !dbg !17
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !17
// CHECK:STDOUT: call void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.d4cda66b3640b619"(ptr %a.var), !dbg !17
// CHECK:STDOUT: %.loc25.n = getelementptr inbounds nuw [4 x i8], ptr %a.var, i32 0, i32 0, !dbg !18
// CHECK:STDOUT: store i32 %n, ptr %.loc25.n, align 4, !dbg !18
// CHECK:STDOUT: call void @_Z4TakeI16NaturallyAlignedEvRT_(ptr %a.var), !dbg !19
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN16NaturallyAlignedC1Ev.carbon_thunk.(ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !21
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8, !tbaa !21
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_COp:thunk:Default.c846b89dd79c7366.Core:NaturallyAligned.Cpp"(ptr sret([4 x i8]) %return) #2 !dbg !24 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN16NaturallyAlignedC1Ev.carbon_thunk.(ptr %return), !dbg !28
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z4TakeI16NaturallyAlignedEvRT_(ptr noundef nonnull align 4 dereferenceable(4)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CExtraAlignment.Main(i32 %n) #0 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca [16 x i8], align 16, !dbg !32
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !32
// CHECK:STDOUT: call void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.34933c1c343bd645"(ptr %a.var), !dbg !32
// CHECK:STDOUT: %.loc33.n = getelementptr inbounds nuw [16 x i8], ptr %a.var, i32 0, i32 0, !dbg !33
// CHECK:STDOUT: store i32 %n, ptr %.loc33.n, align 4, !dbg !33
// CHECK:STDOUT: call void @_Z4TakeI14ExtraAlignmentEvRT_(ptr %a.var), !dbg !34
// CHECK:STDOUT: ret void, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN14ExtraAlignmentC1Ev.carbon_thunk.(ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !36
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8, !tbaa !36
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_COp:thunk:Default.52e7708693d29223.Core:ExtraAlignment.Cpp"(ptr sret([16 x i8]) %return) #2 !dbg !38 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN14ExtraAlignmentC1Ev.carbon_thunk.(ptr %return), !dbg !39
// CHECK:STDOUT: ret void, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z4TakeI14ExtraAlignmentEvRT_(ptr noundef nonnull align 16 dereferenceable(16)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPacked.Main(i32 %n) #0 !dbg !40 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca [4 x i8], align 1, !dbg !43
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !43
// CHECK:STDOUT: call void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.3e10857902c69c1a"(ptr %a.var), !dbg !43
// CHECK:STDOUT: %.loc42.n = getelementptr inbounds nuw [4 x i8], ptr %a.var, i32 0, i32 0, !dbg !44
// CHECK:STDOUT: store i32 %n, ptr %.loc42.n, align 4, !dbg !44
// CHECK:STDOUT: call void @_Z4TakeI6PackedEvRT_(ptr %a.var), !dbg !45
// CHECK:STDOUT: ret void, !dbg !46
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN6PackedC1Ev.carbon_thunk.(ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !47
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8, !tbaa !47
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_COp:thunk:Default.ca2b917a39954a06.Core:Packed.Cpp"(ptr sret([4 x i8]) %return) #2 !dbg !49 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN6PackedC1Ev.carbon_thunk.(ptr %return), !dbg !50
// CHECK:STDOUT: ret void, !dbg !50
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z4TakeI6PackedEvRT_(ptr noundef nonnull align 1 dereferenceable(4)) #3
// 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)) #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.d4cda66b3640b619"(ptr sret([4 x i8]) %return) #0 !dbg !51 {
// CHECK:STDOUT: call void @"_COp:thunk:Default.c846b89dd79c7366.Core:NaturallyAligned.Cpp"(ptr %return), !dbg !53
// CHECK:STDOUT: ret void, !dbg !54
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.34933c1c343bd645"(ptr sret([16 x i8]) %return) #0 !dbg !55 {
// CHECK:STDOUT: call void @"_COp:thunk:Default.52e7708693d29223.Core:ExtraAlignment.Cpp"(ptr %return), !dbg !56
// CHECK:STDOUT: ret void, !dbg !57
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @"_COp.51f3fb62cb986374:DefaultOrUnformed.Core.3e10857902c69c1a"(ptr sret([4 x i8]) %return) #0 !dbg !58 {
// CHECK:STDOUT: call void @"_COp:thunk:Default.ca2b917a39954a06.Core:Packed.Cpp"(ptr %return), !dbg !59
// CHECK:STDOUT: ret void, !dbg !60
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { 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 #2 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #3 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// 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 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 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "alignment.carbon", directory: "")
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "NaturallyAligned", linkageName: "_CNaturallyAligned.Main", scope: null, file: !6, line: 23, type: !12, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !15)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null, !14}
// CHECK:STDOUT: !14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !15 = !{!16}
// CHECK:STDOUT: !16 = !DILocalVariable(arg: 1, scope: !11, type: !14)
// CHECK:STDOUT: !17 = !DILocation(line: 24, column: 3, scope: !11)
// CHECK:STDOUT: !18 = !DILocation(line: 25, column: 3, scope: !11)
// CHECK:STDOUT: !19 = !DILocation(line: 26, column: 3, scope: !11)
// CHECK:STDOUT: !20 = !DILocation(line: 23, column: 1, scope: !11)
// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
// CHECK:STDOUT: !22 = !{!"p1 _ZTS16NaturallyAligned", !23, i64 0}
// CHECK:STDOUT: !23 = !{!"any pointer", !9, i64 0}
// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Default.c846b89dd79c7366.Core:NaturallyAligned.Cpp", scope: null, file: !6, line: 7, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !25 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !28 = !DILocation(line: 7, column: 8, scope: !24)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "ExtraAlignment", linkageName: "_CExtraAlignment.Main", scope: null, file: !6, line: 29, type: !12, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !30)
// CHECK:STDOUT: !30 = !{!31}
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !29, type: !14)
// CHECK:STDOUT: !32 = !DILocation(line: 30, column: 3, scope: !29)
// CHECK:STDOUT: !33 = !DILocation(line: 33, column: 3, scope: !29)
// CHECK:STDOUT: !34 = !DILocation(line: 34, column: 3, scope: !29)
// CHECK:STDOUT: !35 = !DILocation(line: 29, column: 1, scope: !29)
// CHECK:STDOUT: !36 = !{!37, !37, i64 0}
// CHECK:STDOUT: !37 = !{!"p1 _ZTS14ExtraAlignment", !23, i64 0}
// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Default.52e7708693d29223.Core:ExtraAlignment.Cpp", scope: null, file: !6, line: 11, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !39 = !DILocation(line: 11, column: 20, scope: !38)
// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "Packed", linkageName: "_CPacked.Main", scope: null, file: !6, line: 37, type: !12, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !41)
// CHECK:STDOUT: !41 = !{!42}
// CHECK:STDOUT: !42 = !DILocalVariable(arg: 1, scope: !40, type: !14)
// CHECK:STDOUT: !43 = !DILocation(line: 38, column: 3, scope: !40)
// CHECK:STDOUT: !44 = !DILocation(line: 42, column: 3, scope: !40)
// CHECK:STDOUT: !45 = !DILocation(line: 43, column: 3, scope: !40)
// CHECK:STDOUT: !46 = !DILocation(line: 37, column: 1, scope: !40)
// CHECK:STDOUT: !47 = !{!48, !48, i64 0}
// CHECK:STDOUT: !48 = !{!"p1 _ZTS6Packed", !23, i64 0}
// CHECK:STDOUT: !49 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Default.ca2b917a39954a06.Core:Packed.Cpp", scope: null, file: !6, line: 15, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !50 = !DILocation(line: 15, column: 32, scope: !49)
// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "Op", linkageName: "_COp.51f3fb62cb986374:DefaultOrUnformed.Core.d4cda66b3640b619", scope: null, file: !52, line: 9, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !52 = !DIFile(filename: "min_prelude/parts/default.carbon", directory: "")
// CHECK:STDOUT: !53 = !DILocation(line: 9, column: 28, scope: !51)
// CHECK:STDOUT: !54 = !DILocation(line: 9, column: 21, scope: !51)
// CHECK:STDOUT: !55 = distinct !DISubprogram(name: "Op", linkageName: "_COp.51f3fb62cb986374:DefaultOrUnformed.Core.34933c1c343bd645", scope: null, file: !52, line: 9, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !56 = !DILocation(line: 9, column: 28, scope: !55)
// CHECK:STDOUT: !57 = !DILocation(line: 9, column: 21, scope: !55)
// CHECK:STDOUT: !58 = distinct !DISubprogram(name: "Op", linkageName: "_COp.51f3fb62cb986374:DefaultOrUnformed.Core.3e10857902c69c1a", scope: null, file: !52, line: 9, type: !25, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !59 = !DILocation(line: 9, column: 28, scope: !58)
// CHECK:STDOUT: !60 = !DILocation(line: 9, column: 21, scope: !58)
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