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; 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.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, %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 !28, metadata !DIExpression()), !dbg !30 31 %3 = bitcast i32* %2 to i8*, !dbg !31 32 call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %3) #4, !dbg !31 33 %4 = tail call %struct.net_device* @llvm.preserve.struct.access.index.p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff* %0, i32 1, i32 1), !dbg !32, !llvm.preserve.access.index !19 34 %5 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.net_devices(%struct.net_device* %4, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !23 35 %6 = bitcast i32* %5 to i8*, !dbg !32 36 %7 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 4, i8* %6) #4, !dbg !33 37 %8 = load i32, i32* %2, align 4, !dbg !34, !tbaa !35 38 call void @llvm.dbg.value(metadata i32 %8, metadata !29, metadata !DIExpression()), !dbg !30 39 call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %3) #4, !dbg !39 40 ret i32 %8, !dbg !40 41} 42 43; CHECK: .section .BTF,"",@progbits 44; CHECK-NEXT: .short 60319 # 0xeb9f 45; CHECK-NEXT: .byte 1 46; CHECK-NEXT: .byte 0 47; CHECK-NEXT: .long 24 48; CHECK-NEXT: .long 0 49; CHECK-NEXT: .long 132 50; CHECK-NEXT: .long 132 51; CHECK-NEXT: .long 106 52; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1) 53; CHECK-NEXT: .long 33554432 # 0x2000000 54; CHECK-NEXT: .long 2 55; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2) 56; CHECK-NEXT: .long 67108866 # 0x4000002 57; CHECK-NEXT: .long 12 58; CHECK-NEXT: .long 9 59; CHECK-NEXT: .long 3 60; CHECK-NEXT: .long 0 # 0x0 61; CHECK-NEXT: .long 11 62; CHECK-NEXT: .long 4 63; CHECK-NEXT: .long 32 # 0x20 64; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3) 65; CHECK-NEXT: .long 16777216 # 0x1000000 66; CHECK-NEXT: .long 4 67; CHECK-NEXT: .long 16777248 # 0x1000020 68; CHECK-NEXT: .long 19 # BTF_KIND_STRUCT(id = 4) 69; CHECK-NEXT: .long 67108866 # 0x4000002 70; CHECK-NEXT: .long 8 71; CHECK-NEXT: .long 30 72; CHECK-NEXT: .long 3 73; CHECK-NEXT: .long 0 # 0x0 74; CHECK-NEXT: .long 37 75; CHECK-NEXT: .long 3 76; CHECK-NEXT: .long 32 # 0x20 77; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 5) 78; CHECK-NEXT: .long 218103809 # 0xd000001 79; CHECK-NEXT: .long 3 80; CHECK-NEXT: .long 44 81; CHECK-NEXT: .long 1 82; CHECK-NEXT: .long 48 # BTF_KIND_FUNC(id = 6) 83; CHECK-NEXT: .long 201326592 # 0xc000000 84; CHECK-NEXT: .long 5 85; CHECK-NEXT: .byte 0 # string offset=0 86; CHECK-NEXT: .ascii "sk_buff" # string offset=1 87; CHECK-NEXT: .byte 0 88; CHECK-NEXT: .byte 105 # string offset=9 89; CHECK-NEXT: .byte 0 90; CHECK-NEXT: .ascii "dev" # string offset=11 91; CHECK-NEXT: .byte 0 92; CHECK-NEXT: .ascii "int" # string offset=15 93; CHECK-NEXT: .byte 0 94; CHECK-NEXT: .ascii "net_device" # string offset=19 95; CHECK-NEXT: .byte 0 96; CHECK-NEXT: .ascii "dev_id" # string offset=30 97; CHECK-NEXT: .byte 0 98; CHECK-NEXT: .ascii "others" # string offset=37 99; CHECK-NEXT: .byte 0 100; CHECK-NEXT: .ascii "ctx" # string offset=44 101; CHECK-NEXT: .byte 0 102; CHECK-NEXT: .ascii "bpf_prog" # string offset=48 103; CHECK-NEXT: .byte 0 104; CHECK-NEXT: .ascii ".text" # string offset=57 105; CHECK-NEXT: .byte 0 106; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=63 107; CHECK-NEXT: .byte 0 108; CHECK-NEXT: .ascii "0:1:0" # string offset=100 109; CHECK-NEXT: .byte 0 110; CHECK-NEXT: .section .BTF.ext,"",@progbits 111; CHECK-NEXT: .short 60319 # 0xeb9f 112; CHECK-NEXT: .byte 1 113; CHECK-NEXT: .byte 0 114; CHECK-NEXT: .long 40 115; CHECK-NEXT: .long 0 116; CHECK-NEXT: .long 20 117; CHECK-NEXT: .long 20 118; CHECK-NEXT: .long 76 119; CHECK-NEXT: .long 96 120; CHECK-NEXT: .long 24 121; CHECK-NEXT: .long 120 122; CHECK-NEXT: .long 0 123; CHECK-NEXT: .long 8 # FuncInfo 124 125; CHECK: .long 12 # OffsetReloc 126; CHECK-NEXT: .long 57 # Offset reloc section string offset=57 127; CHECK-NEXT: .long 1 128; CHECK-NEXT: .long .Ltmp2 129; CHECK-NEXT: .long 2 130; CHECK-NEXT: .long 100 131 132; Function Attrs: argmemonly nounwind 133declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 134 135; Function Attrs: nounwind readnone 136declare %struct.net_device* @llvm.preserve.struct.access.index.p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff*, i32 immarg, i32 immarg) #2 137 138; Function Attrs: nounwind readnone 139declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.net_devices(%struct.net_device*, i32 immarg, i32 immarg) #2 140 141; Function Attrs: argmemonly nounwind 142declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 143 144; Function Attrs: nounwind readnone speculatable 145declare void @llvm.dbg.value(metadata, metadata, metadata) #3 146 147attributes #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" } 148attributes #1 = { argmemonly nounwind } 149attributes #2 = { nounwind readnone } 150attributes #3 = { nounwind readnone speculatable } 151attributes #4 = { nounwind } 152 153!llvm.dbg.cu = !{!0} 154!llvm.module.flags = !{!11, !12, !13} 155!llvm.ident = !{!14} 156 157!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) 158!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") 159!2 = !{} 160!3 = !{!4} 161!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 162!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 10, type: !6, isLocal: true, isDefinition: true) 163!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 164!7 = !DISubroutineType(types: !8) 165!8 = !{!9, !10, !9, !10} 166!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 167!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) 168!11 = !{i32 2, !"Dwarf Version", i32 4} 169!12 = !{i32 2, !"Debug Info Version", i32 3} 170!13 = !{i32 1, !"wchar_size", i32 4} 171!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} 172!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: !27) 173!16 = !DISubroutineType(types: !17) 174!17 = !{!9, !18} 175!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 176!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 5, size: 96, elements: !20) 177!20 = !{!21, !22} 178!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 6, baseType: !9, size: 32) 179!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 7, baseType: !23, size: 64, offset: 32) 180!23 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 1, size: 64, elements: !24) 181!24 = !{!25, !26} 182!25 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !23, file: !1, line: 2, baseType: !9, size: 32) 183!26 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !23, file: !1, line: 3, baseType: !9, size: 32, offset: 32) 184!27 = !{!28, !29} 185!28 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 13, type: !18) 186!29 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 14, type: !9) 187!30 = !DILocation(line: 0, scope: !15) 188!31 = !DILocation(line: 14, column: 3, scope: !15) 189!32 = !DILocation(line: 15, column: 40, scope: !15) 190!33 = !DILocation(line: 15, column: 3, scope: !15) 191!34 = !DILocation(line: 16, column: 10, scope: !15) 192!35 = !{!36, !36, i64 0} 193!36 = !{!"int", !37, i64 0} 194!37 = !{!"omnipotent char", !38, i64 0} 195!38 = !{!"Simple C/C++ TBAA"} 196!39 = !DILocation(line: 17, column: 1, scope: !15) 197!40 = !DILocation(line: 16, column: 3, scope: !15) 198