; RUN: opt -O2 %s | llvm-dis > %t1 ; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s ; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s ; Source code: ; union sk_buff { ; int i; ; struct { ; int netid; ; union { ; int dev_id; ; int others; ; } dev; ; } u; ; }; ; #define _(x) (__builtin_preserve_access_index(x)) ; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) ; = (void *) 4; ; ; int bpf_prog(union sk_buff *ctx) { ; int dev_id; ; bpf_probe_read(&dev_id, sizeof(int), _(&ctx->u.dev.dev_id)); ; return dev_id; ; } ; Compilation flag: ; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c target triple = "bpf" %union.sk_buff = type { %struct.anon } %struct.anon = type { i32, %union.anon } %union.anon = type { i32 } ; Function Attrs: nounwind define dso_local i32 @bpf_prog(%union.sk_buff*) local_unnamed_addr #0 !dbg !15 { %2 = alloca i32, align 4 call void @llvm.dbg.value(metadata %union.sk_buff* %0, metadata !32, metadata !DIExpression()), !dbg !34 %3 = bitcast i32* %2 to i8*, !dbg !35 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %3) #4, !dbg !35 %4 = tail call %union.sk_buff* @llvm.preserve.union.access.index.p0s_union.sk_buffs.p0s_union.sk_buffs(%union.sk_buff* %0, i32 1), !dbg !36, !llvm.preserve.access.index !19 %5 = getelementptr inbounds %union.sk_buff, %union.sk_buff* %4, i64 0, i32 0, !dbg !36 %6 = tail call %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.anons(%struct.anon* %5, i32 1, i32 1), !dbg !36, !llvm.preserve.access.index !23 %7 = tail call %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon* %6, i32 0), !dbg !36, !llvm.preserve.access.index !27 %8 = bitcast %union.anon* %7 to i8*, !dbg !36 %9 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 4, i8* %8) #4, !dbg !37 %10 = load i32, i32* %2, align 4, !dbg !38, !tbaa !39 call void @llvm.dbg.value(metadata i32 %10, metadata !33, metadata !DIExpression()), !dbg !34 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %3) #4, !dbg !43 ret i32 %10, !dbg !44 } ; CHECK: .section .BTF,"",@progbits ; CHECK-NEXT: .short 60319 # 0xeb9f ; CHECK-NEXT: .byte 1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .long 24 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long 168 ; CHECK-NEXT: .long 168 ; CHECK-NEXT: .long 105 ; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1) ; CHECK-NEXT: .long 33554432 # 0x2000000 ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 1 # BTF_KIND_UNION(id = 2) ; CHECK-NEXT: .long 83886082 # 0x5000002 ; CHECK-NEXT: .long 8 ; CHECK-NEXT: .long 9 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 11 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 13 # BTF_KIND_INT(id = 3) ; CHECK-NEXT: .long 16777216 # 0x1000000 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long 16777248 # 0x1000020 ; CHECK-NEXT: .long 0 # BTF_KIND_STRUCT(id = 4) ; CHECK-NEXT: .long 67108866 # 0x4000002 ; CHECK-NEXT: .long 8 ; CHECK-NEXT: .long 17 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 23 ; CHECK-NEXT: .long 5 ; CHECK-NEXT: .long 32 # 0x20 ; CHECK-NEXT: .long 0 # BTF_KIND_UNION(id = 5) ; CHECK-NEXT: .long 83886082 # 0x5000002 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long 27 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 34 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 6) ; CHECK-NEXT: .long 218103809 # 0xd000001 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 41 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long 45 # BTF_KIND_FUNC(id = 7) ; CHECK-NEXT: .long 201326593 # 0xc000001 ; CHECK-NEXT: .long 6 ; CHECK-NEXT: .byte 0 # string offset=0 ; CHECK-NEXT: .ascii "sk_buff" # string offset=1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .byte 105 # string offset=9 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .byte 117 # string offset=11 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "int" # string offset=13 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "netid" # string offset=17 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "dev" # string offset=23 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "dev_id" # string offset=27 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "others" # string offset=34 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "ctx" # string offset=41 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "bpf_prog" # string offset=45 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii ".text" # string offset=54 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=60 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "0:1:1:0" # string offset=97 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .section .BTF.ext,"",@progbits ; CHECK-NEXT: .short 60319 # 0xeb9f ; CHECK-NEXT: .byte 1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .long 32 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long 20 ; CHECK-NEXT: .long 20 ; CHECK-NEXT: .long {{[0-9]+}} ; CHECK-NEXT: .long {{[0-9]+}} ; CHECK-NEXT: .long 28 ; CHECK-NEXT: .long 8 # FuncInfo ; CHECK: .long 16 # FieldReloc ; CHECK-NEXT: .long 54 # Field reloc section string offset=54 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 97 ; CHECK-NEXT: .long 0 ; Function Attrs: argmemonly nounwind declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 ; Function Attrs: nounwind readnone declare %union.sk_buff* @llvm.preserve.union.access.index.p0s_union.sk_buffs.p0s_union.sk_buffs(%union.sk_buff*, i32 immarg) #2 ; Function Attrs: nounwind readnone declare %union.anon* @llvm.preserve.struct.access.index.p0s_union.anons.p0s_struct.anons(%struct.anon*, i32 immarg, i32 immarg) #2 ; Function Attrs: nounwind readnone declare %union.anon* @llvm.preserve.union.access.index.p0s_union.anons.p0s_union.anons(%union.anon*, i32 immarg) #2 ; Function Attrs: argmemonly nounwind declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 ; Function Attrs: nounwind readnone speculatable declare void @llvm.dbg.value(metadata, metadata, metadata) #3 attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } attributes #1 = { argmemonly nounwind } attributes #2 = { nounwind readnone } attributes #3 = { nounwind readnone speculatable } attributes #4 = { nounwind } !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!11, !12, !13} !llvm.ident = !{!14} !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, nameTableKind: None) !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") !2 = !{} !3 = !{!4} !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) !5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 12, type: !6, isLocal: true, isDefinition: true) !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) !7 = !DISubroutineType(types: !8) !8 = !{!9, !10, !9, !10} !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) !11 = !{i32 2, !"Dwarf Version", i32 4} !12 = !{i32 2, !"Debug Info Version", i32 3} !13 = !{i32 1, !"wchar_size", i32 4} !14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} !15 = distinct !DISubprogram(name: "bpf_prog", scope: !1, file: !1, line: 15, type: !16, scopeLine: 15, flags: DIFlagPrototyped, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !31) !16 = !DISubroutineType(types: !17) !17 = !{!9, !18} !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) !19 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "sk_buff", file: !1, line: 1, size: 64, elements: !20) !20 = !{!21, !22} !21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 2, baseType: !9, size: 32) !22 = !DIDerivedType(tag: DW_TAG_member, name: "u", scope: !19, file: !1, line: 9, baseType: !23, size: 64) !23 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !19, file: !1, line: 3, size: 64, elements: !24) !24 = !{!25, !26} !25 = !DIDerivedType(tag: DW_TAG_member, name: "netid", scope: !23, file: !1, line: 4, baseType: !9, size: 32) !26 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !23, file: !1, line: 8, baseType: !27, size: 32, offset: 32) !27 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !23, file: !1, line: 5, size: 32, elements: !28) !28 = !{!29, !30} !29 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !27, file: !1, line: 6, baseType: !9, size: 32) !30 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !27, file: !1, line: 7, baseType: !9, size: 32) !31 = !{!32, !33} !32 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 15, type: !18) !33 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 16, type: !9) !34 = !DILocation(line: 0, scope: !15) !35 = !DILocation(line: 16, column: 3, scope: !15) !36 = !DILocation(line: 17, column: 40, scope: !15) !37 = !DILocation(line: 17, column: 3, scope: !15) !38 = !DILocation(line: 18, column: 10, scope: !15) !39 = !{!40, !40, i64 0} !40 = !{!"int", !41, i64 0} !41 = !{!"omnipotent char", !42, i64 0} !42 = !{!"Simple C/C++ TBAA"} !43 = !DILocation(line: 19, column: 1, scope: !15) !44 = !DILocation(line: 18, column: 3, scope: !15)