1; RUN: opt -O2 %s | llvm-dis > %t1 2; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 3; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 4; Source code: 5; struct net_device { 6; int dev_id; 7; int others; 8; }; 9; struct sk_buff { 10; int i; 11; struct net_device dev[10]; 12; }; 13; #define _(x) (__builtin_preserve_access_index(x)) 14; static int (*bpf_probe_read)(ptr dst, int size, ptr unsafe_ptr) 15; = (ptr) 4; 16; 17; int bpf_prog(struct sk_buff *ctx) { 18; int dev_id; 19; bpf_probe_read(&dev_id, sizeof(int), _(&ctx->dev[5].dev_id)); 20; return dev_id; 21; } 22; Compilation flag: 23; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 24 25target triple = "bpf" 26 27%struct.sk_buff = type { i32, [10 x %struct.net_device] } 28%struct.net_device = type { i32, i32 } 29 30; Function Attrs: nounwind 31define dso_local i32 @bpf_prog(ptr) local_unnamed_addr #0 !dbg !15 { 32 %2 = alloca i32, align 4 33 call void @llvm.dbg.value(metadata ptr %0, metadata !31, metadata !DIExpression()), !dbg !33 34 call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4, !dbg !34 35 %3 = tail call ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr elementtype(%struct.sk_buff) %0, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !19 36 %4 = tail call ptr @llvm.preserve.array.access.index.p0.net_devices.p0.net_devices(ptr elementtype([10 x %struct.net_device]) %3, i32 1, i32 5), !dbg !35, !llvm.preserve.access.index !23 37 %5 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr elementtype(%struct.net_device) %4, i32 0, i32 0), !dbg !35, !llvm.preserve.access.index !24 38 %6 = call i32 inttoptr (i64 4 to ptr)(ptr nonnull %2, i32 4, ptr %5) #4, !dbg !36 39 %7 = load i32, ptr %2, align 4, !dbg !37, !tbaa !38 40 call void @llvm.dbg.value(metadata i32 %7, metadata !32, metadata !DIExpression()), !dbg !33 41 call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4, !dbg !42 42 ret i32 %7, !dbg !43 43} 44 45; CHECK: .section .BTF,"",@progbits 46; CHECK-NEXT: .short 60319 # 0xeb9f 47; CHECK-NEXT: .byte 1 48; CHECK-NEXT: .byte 0 49; CHECK-NEXT: .long 24 50; CHECK-NEXT: .long 0 51; CHECK-NEXT: .long 172 52; CHECK-NEXT: .long 172 53; CHECK-NEXT: .long 128 54; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1) 55; CHECK-NEXT: .long 33554432 # 0x2000000 56; CHECK-NEXT: .long 2 57; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2) 58; CHECK-NEXT: .long 67108866 # 0x4000002 59; CHECK-NEXT: .long 84 60; CHECK-NEXT: .long 9 61; CHECK-NEXT: .long 3 62; CHECK-NEXT: .long 0 # 0x0 63; CHECK-NEXT: .long 11 64; CHECK-NEXT: .long 5 65; CHECK-NEXT: .long 32 # 0x20 66; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3) 67; CHECK-NEXT: .long 16777216 # 0x1000000 68; CHECK-NEXT: .long 4 69; CHECK-NEXT: .long 16777248 # 0x1000020 70; CHECK-NEXT: .long 19 # BTF_KIND_STRUCT(id = 4) 71; CHECK-NEXT: .long 67108866 # 0x4000002 72; CHECK-NEXT: .long 8 73; CHECK-NEXT: .long 30 74; CHECK-NEXT: .long 3 75; CHECK-NEXT: .long 0 # 0x0 76; CHECK-NEXT: .long 37 77; CHECK-NEXT: .long 3 78; CHECK-NEXT: .long 32 # 0x20 79; CHECK-NEXT: .long 0 # BTF_KIND_ARRAY(id = 5) 80; CHECK-NEXT: .long 50331648 # 0x3000000 81; CHECK-NEXT: .long 0 82; CHECK-NEXT: .long 4 83; CHECK-NEXT: .long 6 84; CHECK-NEXT: .long 10 85; CHECK-NEXT: .long 44 # BTF_KIND_INT(id = 6) 86; CHECK-NEXT: .long 16777216 # 0x1000000 87; CHECK-NEXT: .long 4 88; CHECK-NEXT: .long 32 # 0x20 89; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 7) 90; CHECK-NEXT: .long 218103809 # 0xd000001 91; CHECK-NEXT: .long 3 92; CHECK-NEXT: .long 64 93; CHECK-NEXT: .long 1 94; CHECK-NEXT: .long 68 # BTF_KIND_FUNC(id = 8) 95; CHECK-NEXT: .long 201326593 # 0xc000001 96; CHECK-NEXT: .long 7 97; CHECK-NEXT: .byte 0 # string offset=0 98; CHECK-NEXT: .ascii "sk_buff" # string offset=1 99; CHECK-NEXT: .byte 0 100; CHECK-NEXT: .byte 105 # string offset=9 101; CHECK-NEXT: .byte 0 102; CHECK-NEXT: .ascii "dev" # string offset=11 103; CHECK-NEXT: .byte 0 104; CHECK-NEXT: .ascii "int" # string offset=15 105; CHECK-NEXT: .byte 0 106; CHECK-NEXT: .ascii "net_device" # string offset=19 107; CHECK-NEXT: .byte 0 108; CHECK-NEXT: .ascii "dev_id" # string offset=30 109; CHECK-NEXT: .byte 0 110; CHECK-NEXT: .ascii "others" # string offset=37 111; CHECK-NEXT: .byte 0 112; CHECK-NEXT: .ascii "__ARRAY_SIZE_TYPE__" # string offset=44 113; CHECK-NEXT: .byte 0 114; CHECK-NEXT: .ascii "ctx" # string offset=64 115; CHECK-NEXT: .byte 0 116; CHECK-NEXT: .ascii "bpf_prog" # string offset=68 117; CHECK-NEXT: .byte 0 118; CHECK-NEXT: .ascii ".text" # string offset=77 119; CHECK-NEXT: .byte 0 120; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=83 121; CHECK-NEXT: .byte 0 122; CHECK-NEXT: .ascii "0:1:5:0" # string offset=120 123; CHECK-NEXT: .byte 0 124; CHECK-NEXT: .section .BTF.ext,"",@progbits 125; CHECK-NEXT: .short 60319 # 0xeb9f 126; CHECK-NEXT: .byte 1 127; CHECK-NEXT: .byte 0 128; CHECK-NEXT: .long 32 129; CHECK-NEXT: .long 0 130; CHECK-NEXT: .long 20 131; CHECK-NEXT: .long 20 132; CHECK-NEXT: .long {{[0-9]+}} 133; CHECK-NEXT: .long {{[0-9]+}} 134; CHECK-NEXT: .long 28 135; CHECK-NEXT: .long 8 # FuncInfo 136 137; CHECK: .long 16 # FieldReloc 138; CHECK-NEXT: .long 77 # Field reloc section string offset=77 139; CHECK-NEXT: .long 1 140; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 141; CHECK-NEXT: .long 2 142; CHECK-NEXT: .long 120 143; CHECK-NEXT: .long 0 144 145; Function Attrs: argmemonly nounwind 146declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 147 148; Function Attrs: nounwind readnone 149declare ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr, i32 immarg, i32 immarg) #2 150 151; Function Attrs: nounwind readnone 152declare ptr @llvm.preserve.array.access.index.p0.net_devices.p0.net_devices(ptr, i32 immarg, i32 immarg) #2 153 154; Function Attrs: nounwind readnone 155declare ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr, i32 immarg, i32 immarg) #2 156 157; Function Attrs: argmemonly nounwind 158declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 159 160; Function Attrs: nounwind readnone speculatable 161declare void @llvm.dbg.value(metadata, metadata, metadata) #3 162 163attributes #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" } 164attributes #1 = { argmemonly nounwind } 165attributes #2 = { nounwind readnone } 166attributes #3 = { nounwind readnone speculatable } 167attributes #4 = { nounwind } 168 169!llvm.dbg.cu = !{!0} 170!llvm.module.flags = !{!11, !12, !13} 171!llvm.ident = !{!14} 172 173!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) 174!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") 175!2 = !{} 176!3 = !{!4} 177!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 178!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 10, type: !6, isLocal: true, isDefinition: true) 179!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 180!7 = !DISubroutineType(types: !8) 181!8 = !{!9, !10, !9, !10} 182!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 183!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) 184!11 = !{i32 2, !"Dwarf Version", i32 4} 185!12 = !{i32 2, !"Debug Info Version", i32 3} 186!13 = !{i32 1, !"wchar_size", i32 4} 187!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} 188!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) 189!16 = !DISubroutineType(types: !17) 190!17 = !{!9, !18} 191!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 192!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 5, size: 672, elements: !20) 193!20 = !{!21, !22} 194!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 6, baseType: !9, size: 32) 195!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 7, baseType: !23, size: 640, offset: 32) 196!23 = !DICompositeType(tag: DW_TAG_array_type, baseType: !24, size: 640, elements: !28) 197!24 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 1, size: 64, elements: !25) 198!25 = !{!26, !27} 199!26 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !24, file: !1, line: 2, baseType: !9, size: 32) 200!27 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !24, file: !1, line: 3, baseType: !9, size: 32, offset: 32) 201!28 = !{!29} 202!29 = !DISubrange(count: 10) 203!30 = !{!31, !32} 204!31 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 13, type: !18) 205!32 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 14, type: !9) 206!33 = !DILocation(line: 0, scope: !15) 207!34 = !DILocation(line: 14, column: 3, scope: !15) 208!35 = !DILocation(line: 15, column: 40, scope: !15) 209!36 = !DILocation(line: 15, column: 3, scope: !15) 210!37 = !DILocation(line: 16, column: 10, scope: !15) 211!38 = !{!39, !39, i64 0} 212!39 = !{!"int", !40, i64 0} 213!40 = !{!"omnipotent char", !41, i64 0} 214!41 = !{!"Simple C/C++ TBAA"} 215!42 = !DILocation(line: 17, column: 1, scope: !15) 216!43 = !DILocation(line: 16, column: 3, scope: !15) 217