125 lines · plain
1; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t12; RUN: llc -o - %t1 | FileCheck %s3;4; Source:5; typedef union {6; struct {7; void *kernel;8; void *user;9; };10; unsigned is_kernel : 1;11; } __attribute__((preserve_access_index)) sockptr_t;12; void *foo(void);13; int test() {14; sockptr_t *arg = foo();15; return __builtin_preserve_field_info(arg->is_kernel, 1);16; }17; Compilation flag:18; clang -target bpf -O2 -S -emit-llvm -g -Xclang -disable-llvm-passes test.c19 20%union.sockptr_t = type { %struct.anon }21%struct.anon = type { ptr, ptr }22 23; Function Attrs: nounwind24define dso_local i32 @test() #0 !dbg !7 {25entry:26 %arg = alloca ptr, align 827 call void @llvm.lifetime.start.p0(i64 8, ptr %arg) #6, !dbg !2528 call void @llvm.dbg.declare(metadata ptr %arg, metadata !12, metadata !DIExpression()), !dbg !2629 %call = call ptr @foo(), !dbg !2730 store ptr %call, ptr %arg, align 8, !dbg !26, !tbaa !2831 %0 = load ptr, ptr %arg, align 8, !dbg !32, !tbaa !2832 %1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%union.sockptr_t) %0, i32 0, i32 1), !dbg !33, !llvm.preserve.access.index !1533 %2 = call i32 @llvm.bpf.preserve.field.info.p0(ptr %1, i64 1), !dbg !3434 call void @llvm.lifetime.end.p0(i64 8, ptr %arg) #6, !dbg !3535 ret i32 %2, !dbg !3636}37 38; CHECK: .long 56 # BTF_KIND_TYPEDEF(id = 7)39; CHECK-NEXT: .long 134217728 # 0x800000040; CHECK-NEXT: .long 841; CHECK-NEXT: .long 0 # BTF_KIND_UNION(id = 8)42 43; CHECK: .ascii ".text" # string offset=1044; CHECK: .ascii "sockptr_t" # string offset=5645; CHECK: .ascii "0:1" # string offset=10146 47; CHECK: .long 16 # FieldReloc48; CHECK-NEXT: .long 10 # Field reloc section string offset=1049; CHECK-NEXT: .long 150; CHECK-NEXT: .long .Ltmp[[#]]51; CHECK-NEXT: .long 752; CHECK-NEXT: .long 10153; CHECK-NEXT: .long 154 55; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn56declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #157 58; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn59declare void @llvm.dbg.declare(metadata, metadata, metadata) #260 61declare !dbg !37 dso_local ptr @foo() #362 63; Function Attrs: nocallback nofree nosync nounwind readnone willreturn64declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #465 66; Function Attrs: nounwind readnone67declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64 immarg) #568 69; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn70declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #171 72attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }73attributes #1 = { argmemonly nocallback nofree nosync nounwind willreturn }74attributes #2 = { nocallback nofree nosync nounwind readnone speculatable willreturn }75attributes #3 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }76attributes #4 = { nocallback nofree nosync nounwind readnone willreturn }77attributes #5 = { nounwind readnone }78attributes #6 = { nounwind }79 80!llvm.dbg.cu = !{!0}81!llvm.module.flags = !{!2, !3, !4, !5}82!llvm.ident = !{!6}83 84!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 15.0.0 (https://github.com/llvm/llvm-project.git 8c7d5118961e7ffc0304126ec2122d21e2eb1f79)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)85!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/test/anon", checksumkind: CSK_MD5, checksum: "03904da5c5e53b14bb1effb6d9d5e025")86!2 = !{i32 7, !"Dwarf Version", i32 5}87!3 = !{i32 2, !"Debug Info Version", i32 3}88!4 = !{i32 1, !"wchar_size", i32 4}89!5 = !{i32 7, !"frame-pointer", i32 2}90!6 = !{!"clang version 15.0.0 (https://github.com/llvm/llvm-project.git 8c7d5118961e7ffc0304126ec2122d21e2eb1f79)"}91!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 9, type: !8, scopeLine: 9, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)92!8 = !DISubroutineType(types: !9)93!9 = !{!10}94!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)95!11 = !{!12}96!12 = !DILocalVariable(name: "arg", scope: !7, file: !1, line: 10, type: !13)97!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)98!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "sockptr_t", file: !1, line: 7, baseType: !15)99!15 = distinct !DICompositeType(tag: DW_TAG_union_type, file: !1, line: 1, size: 128, elements: !16)100!16 = !{!17, !23}101!17 = !DIDerivedType(tag: DW_TAG_member, scope: !15, file: !1, line: 2, baseType: !18, size: 128)102!18 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !15, file: !1, line: 2, size: 128, elements: !19)103!19 = !{!20, !22}104!20 = !DIDerivedType(tag: DW_TAG_member, name: "kernel", scope: !18, file: !1, line: 3, baseType: !21, size: 64)105!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)106!22 = !DIDerivedType(tag: DW_TAG_member, name: "user", scope: !18, file: !1, line: 4, baseType: !21, size: 64, offset: 64)107!23 = !DIDerivedType(tag: DW_TAG_member, name: "is_kernel", scope: !15, file: !1, line: 6, baseType: !24, size: 1, flags: DIFlagBitField, extraData: i64 0)108!24 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)109!25 = !DILocation(line: 10, column: 3, scope: !7)110!26 = !DILocation(line: 10, column: 14, scope: !7)111!27 = !DILocation(line: 10, column: 20, scope: !7)112!28 = !{!29, !29, i64 0}113!29 = !{!"any pointer", !30, i64 0}114!30 = !{!"omnipotent char", !31, i64 0}115!31 = !{!"Simple C/C++ TBAA"}116!32 = !DILocation(line: 11, column: 40, scope: !7)117!33 = !DILocation(line: 11, column: 45, scope: !7)118!34 = !DILocation(line: 11, column: 10, scope: !7)119!35 = !DILocation(line: 12, column: 1, scope: !7)120!36 = !DILocation(line: 11, column: 3, scope: !7)121!37 = !DISubprogram(name: "foo", scope: !1, file: !1, line: 8, type: !38, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !40)122!38 = !DISubroutineType(types: !39)123!39 = !{!21}124!40 = !{}125