1; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s 2; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s 3; Source code: 4; struct net_device { 5; int dev_id; 6; int others; 7; }; 8; struct sk_buff { 9; int i; 10; struct net_device dev[10]; 11; }; 12; #define _(x) (__builtin_preserve_access_index(x)) 13; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) 14; = (void *) 4; 15; 16; int bpf_prog(struct sk_buff *ctx) { 17; int dev_id; 18; bpf_probe_read(&dev_id, sizeof(int), _(&ctx->dev[5].dev_id)); 19; return dev_id; 20; } 21; Compilation flag: 22; clang -target bpf -O2 -g -S -emit-llvm test.c 23 24%struct.sk_buff = type { i32, [10 x %struct.net_device] } 25%struct.net_device = type { i32, i32 } 26 27; Function Attrs: nounwind 28define dso_local i32 @bpf_prog(%struct.sk_buff*) local_unnamed_addr #0 !dbg !15 { 29 %2 = alloca i32, align 4 30 call void @llvm.dbg.value(metadata %struct.sk_buff* %0, metadata !31, metadata !DIExpression()), !dbg !33 31 %3 = bitcast i32* %2 to i8*, !dbg !34 32 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %3) #4, !dbg !34 33 %4 = tail call [10 x %struct.net_device]* @llvm.preserve.struct.access.index.p0a10s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff* %0, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !19 34 %5 = tail call %struct.net_device* @llvm.preserve.array.access.index.p0s_struct.net_devices.p0a10s_struct.net_devices([10 x %struct.net_device]* %4, i32 1, i32 5), !dbg !35, !llvm.preserve.access.index !23 35 %6 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.net_devices(%struct.net_device* %5, i32 0, i32 0), !dbg !35, !llvm.preserve.access.index !24 36 %7 = bitcast i32* %6 to i8*, !dbg !35 37 %8 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 4, i8* %7) #4, !dbg !36 38 %9 = load i32, i32* %2, align 4, !dbg !37, !tbaa !38 39 call void @llvm.dbg.value(metadata i32 %9, metadata !32, metadata !DIExpression()), !dbg !33 40 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %3) #4, !dbg !42 41 ret i32 %9, !dbg !43 42} 43 44; CHECK: .section .BTF,"",@progbits 45; CHECK-NEXT: .short 60319 # 0xeb9f 46; CHECK-NEXT: .byte 1 47; CHECK-NEXT: .byte 0 48; CHECK-NEXT: .long 24 49; CHECK-NEXT: .long 0 50; CHECK-NEXT: .long 172 51; CHECK-NEXT: .long 172 52; CHECK-NEXT: .long 128 53; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1) 54; CHECK-NEXT: .long 33554432 # 0x2000000 55; CHECK-NEXT: .long 2 56; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2) 57; CHECK-NEXT: .long 67108866 # 0x4000002 58; CHECK-NEXT: .long 84 59; CHECK-NEXT: .long 9 60; CHECK-NEXT: .long 3 61; CHECK-NEXT: .long 0 # 0x0 62; CHECK-NEXT: .long 11 63; CHECK-NEXT: .long 5 64; CHECK-NEXT: .long 32 # 0x20 65; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3) 66; CHECK-NEXT: .long 16777216 # 0x1000000 67; CHECK-NEXT: .long 4 68; CHECK-NEXT: .long 16777248 # 0x1000020 69; CHECK-NEXT: .long 19 # BTF_KIND_STRUCT(id = 4) 70; CHECK-NEXT: .long 67108866 # 0x4000002 71; CHECK-NEXT: .long 8 72; CHECK-NEXT: .long 30 73; CHECK-NEXT: .long 3 74; CHECK-NEXT: .long 0 # 0x0 75; CHECK-NEXT: .long 37 76; CHECK-NEXT: .long 3 77; CHECK-NEXT: .long 32 # 0x20 78; CHECK-NEXT: .long 0 # BTF_KIND_ARRAY(id = 5) 79; CHECK-NEXT: .long 50331648 # 0x3000000 80; CHECK-NEXT: .long 0 81; CHECK-NEXT: .long 4 82; CHECK-NEXT: .long 6 83; CHECK-NEXT: .long 10 84; CHECK-NEXT: .long 44 # BTF_KIND_INT(id = 6) 85; CHECK-NEXT: .long 16777216 # 0x1000000 86; CHECK-NEXT: .long 4 87; CHECK-NEXT: .long 32 # 0x20 88; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 7) 89; CHECK-NEXT: .long 218103809 # 0xd000001 90; CHECK-NEXT: .long 3 91; CHECK-NEXT: .long 64 92; CHECK-NEXT: .long 1 93; CHECK-NEXT: .long 68 # BTF_KIND_FUNC(id = 8) 94; CHECK-NEXT: .long 201326592 # 0xc000000 95; CHECK-NEXT: .long 7 96; CHECK-NEXT: .byte 0 # string offset=0 97; CHECK-NEXT: .ascii "sk_buff" # string offset=1 98; CHECK-NEXT: .byte 0 99; CHECK-NEXT: .byte 105 # string offset=9 100; CHECK-NEXT: .byte 0 101; CHECK-NEXT: .ascii "dev" # string offset=11 102; CHECK-NEXT: .byte 0 103; CHECK-NEXT: .ascii "int" # string offset=15 104; CHECK-NEXT: .byte 0 105; CHECK-NEXT: .ascii "net_device" # string offset=19 106; CHECK-NEXT: .byte 0 107; CHECK-NEXT: .ascii "dev_id" # string offset=30 108; CHECK-NEXT: .byte 0 109; CHECK-NEXT: .ascii "others" # string offset=37 110; CHECK-NEXT: .byte 0 111; CHECK-NEXT: .ascii "__ARRAY_SIZE_TYPE__" # string offset=44 112; CHECK-NEXT: .byte 0 113; CHECK-NEXT: .ascii "ctx" # string offset=64 114; CHECK-NEXT: .byte 0 115; CHECK-NEXT: .ascii "bpf_prog" # string offset=68 116; CHECK-NEXT: .byte 0 117; CHECK-NEXT: .ascii ".text" # string offset=77 118; CHECK-NEXT: .byte 0 119; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=83 120; CHECK-NEXT: .byte 0 121; CHECK-NEXT: .ascii "0:1:5:0" # string offset=120 122; CHECK-NEXT: .byte 0 123; CHECK-NEXT: .section .BTF.ext,"",@progbits 124; CHECK-NEXT: .short 60319 # 0xeb9f 125; CHECK-NEXT: .byte 1 126; CHECK-NEXT: .byte 0 127; CHECK-NEXT: .long 32 128; CHECK-NEXT: .long 0 129; CHECK-NEXT: .long 20 130; CHECK-NEXT: .long 20 131; CHECK-NEXT: .long 76 132; CHECK-NEXT: .long 96 133; CHECK-NEXT: .long 28 134; CHECK-NEXT: .long 8 # FuncInfo 135 136; CHECK: .long 16 # FieldReloc 137; CHECK-NEXT: .long 77 # Field reloc section string offset=77 138; CHECK-NEXT: .long 1 139; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 140; CHECK-NEXT: .long 2 141; CHECK-NEXT: .long 120 142; CHECK-NEXT: .long 0 143 144; Function Attrs: argmemonly nounwind 145declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 146 147; Function Attrs: nounwind readnone 148declare [10 x %struct.net_device]* @llvm.preserve.struct.access.index.p0a10s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff*, i32 immarg, i32 immarg) #2 149 150; Function Attrs: nounwind readnone 151declare %struct.net_device* @llvm.preserve.array.access.index.p0s_struct.net_devices.p0a10s_struct.net_devices([10 x %struct.net_device]*, i32 immarg, i32 immarg) #2 152 153; Function Attrs: nounwind readnone 154declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.net_devices(%struct.net_device*, i32 immarg, i32 immarg) #2 155 156; Function Attrs: argmemonly nounwind 157declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 158 159; Function Attrs: nounwind readnone speculatable 160declare void @llvm.dbg.value(metadata, metadata, metadata) #3 161 162attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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" } 163attributes #1 = { argmemonly nounwind } 164attributes #2 = { nounwind readnone } 165attributes #3 = { nounwind readnone speculatable } 166attributes #4 = { nounwind } 167 168!llvm.dbg.cu = !{!0} 169!llvm.module.flags = !{!11, !12, !13} 170!llvm.ident = !{!14} 171 172!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) 173!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") 174!2 = !{} 175!3 = !{!4} 176!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 177!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 10, type: !6, isLocal: true, isDefinition: true) 178!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 179!7 = !DISubroutineType(types: !8) 180!8 = !{!9, !10, !9, !10} 181!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 182!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) 183!11 = !{i32 2, !"Dwarf Version", i32 4} 184!12 = !{i32 2, !"Debug Info Version", i32 3} 185!13 = !{i32 1, !"wchar_size", i32 4} 186!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} 187!15 = distinct !DISubprogram(name: "bpf_prog", scope: !1, file: !1, line: 13, type: !16, scopeLine: 13, flags: DIFlagPrototyped, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !30) 188!16 = !DISubroutineType(types: !17) 189!17 = !{!9, !18} 190!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 191!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 5, size: 672, elements: !20) 192!20 = !{!21, !22} 193!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 6, baseType: !9, size: 32) 194!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 7, baseType: !23, size: 640, offset: 32) 195!23 = !DICompositeType(tag: DW_TAG_array_type, baseType: !24, size: 640, elements: !28) 196!24 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 1, size: 64, elements: !25) 197!25 = !{!26, !27} 198!26 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !24, file: !1, line: 2, baseType: !9, size: 32) 199!27 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !24, file: !1, line: 3, baseType: !9, size: 32, offset: 32) 200!28 = !{!29} 201!29 = !DISubrange(count: 10) 202!30 = !{!31, !32} 203!31 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 13, type: !18) 204!32 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 14, type: !9) 205!33 = !DILocation(line: 0, scope: !15) 206!34 = !DILocation(line: 14, column: 3, scope: !15) 207!35 = !DILocation(line: 15, column: 40, scope: !15) 208!36 = !DILocation(line: 15, column: 3, scope: !15) 209!37 = !DILocation(line: 16, column: 10, scope: !15) 210!38 = !{!39, !39, i64 0} 211!39 = !{!"int", !40, i64 0} 212!40 = !{!"omnipotent char", !41, i64 0} 213!41 = !{!"Simple C/C++ TBAA"} 214!42 = !DILocation(line: 17, column: 1, scope: !15) 215!43 = !DILocation(line: 16, column: 3, scope: !15) 216