1 ; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
2 ; RUN: llc -o - %t1 | FileCheck %s
10 ; unsigned is_kernel : 1;
11 ; } __attribute__((preserve_access_index)) sockptr_t;
14 ; sockptr_t *arg = foo();
15 ; return __builtin_preserve_field_info(arg->is_kernel, 1);
18 ; clang -target bpf -O2 -S -emit-llvm -g -Xclang -disable-llvm-passes test.c
20 %union.sockptr_t = type { %struct.anon }
21 %struct.anon = type { ptr, ptr }
23 ; Function Attrs: nounwind
24 define dso_local i32 @test() #0 !dbg !7 {
26 %arg = alloca ptr, align 8
27 call void @llvm.lifetime.start.p0(i64 8, ptr %arg) #6, !dbg !25
28 call void @llvm.dbg.declare(metadata ptr %arg, metadata !12, metadata !DIExpression()), !dbg !26
29 %call = call ptr @foo(), !dbg !27
30 store ptr %call, ptr %arg, align 8, !dbg !26, !tbaa !28
31 %0 = load ptr, ptr %arg, align 8, !dbg !32, !tbaa !28
32 %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 !15
33 %2 = call i32 @llvm.bpf.preserve.field.info.p0(ptr %1, i64 1), !dbg !34
34 call void @llvm.lifetime.end.p0(i64 8, ptr %arg) #6, !dbg !35
38 ; CHECK: .long 56 # BTF_KIND_TYPEDEF(id = 7)
39 ; CHECK-NEXT: .long 134217728 # 0x8000000
41 ; CHECK-NEXT: .long 0 # BTF_KIND_UNION(id = 8)
43 ; CHECK: .ascii ".text" # string offset=10
44 ; CHECK: .ascii "sockptr_t" # string offset=56
45 ; CHECK: .ascii "0:1" # string offset=101
47 ; CHECK: .long 16 # FieldReloc
48 ; CHECK-NEXT: .long 10 # Field reloc section string offset=10
50 ; CHECK-NEXT: .long .Ltmp[[#]]
52 ; CHECK-NEXT: .long 101
55 ; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
56 declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
58 ; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
59 declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
61 declare !dbg !37 dso_local ptr @foo() #3
63 ; Function Attrs: nocallback nofree nosync nounwind readnone willreturn
64 declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #4
66 ; Function Attrs: nounwind readnone
67 declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64 immarg) #5
69 ; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
70 declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
72 attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
73 attributes #1 = { argmemonly nocallback nofree nosync nounwind willreturn }
74 attributes #2 = { nocallback nofree nosync nounwind readnone speculatable willreturn }
75 attributes #3 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
76 attributes #4 = { nocallback nofree nosync nounwind readnone willreturn }
77 attributes #5 = { nounwind readnone }
78 attributes #6 = { nounwind }
81 !llvm.module.flags = !{!2, !3, !4, !5}
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)
94 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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)
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)
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)