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; 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.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, %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 !28, metadata !DIExpression()), !dbg !30 34 call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4, !dbg !31 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 !32, !llvm.preserve.access.index !19 36 %4 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr elementtype(%struct.net_device) %3, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !23 37 %5 = call i32 inttoptr (i64 4 to ptr)(ptr nonnull %2, i32 4, ptr %4) #4, !dbg !33 38 %6 = load i32, ptr %2, align 4, !dbg !34, !tbaa !35 39 call void @llvm.dbg.value(metadata i32 %6, metadata !29, metadata !DIExpression()), !dbg !30 40 call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4, !dbg !39 41 ret i32 %6, !dbg !40 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 132 51; CHECK-NEXT: .long 132 52; CHECK-NEXT: .long 106 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 12 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 4 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_FUNC_PROTO(id = 5) 79; CHECK-NEXT: .long 218103809 # 0xd000001 80; CHECK-NEXT: .long 3 81; CHECK-NEXT: .long 44 82; CHECK-NEXT: .long 1 83; CHECK-NEXT: .long 48 # BTF_KIND_FUNC(id = 6) 84; CHECK-NEXT: .long 201326593 # 0xc000001 85; CHECK-NEXT: .long 5 86; CHECK-NEXT: .byte 0 # string offset=0 87; CHECK-NEXT: .ascii "sk_buff" # string offset=1 88; CHECK-NEXT: .byte 0 89; CHECK-NEXT: .byte 105 # string offset=9 90; CHECK-NEXT: .byte 0 91; CHECK-NEXT: .ascii "dev" # string offset=11 92; CHECK-NEXT: .byte 0 93; CHECK-NEXT: .ascii "int" # string offset=15 94; CHECK-NEXT: .byte 0 95; CHECK-NEXT: .ascii "net_device" # string offset=19 96; CHECK-NEXT: .byte 0 97; CHECK-NEXT: .ascii "dev_id" # string offset=30 98; CHECK-NEXT: .byte 0 99; CHECK-NEXT: .ascii "others" # string offset=37 100; CHECK-NEXT: .byte 0 101; CHECK-NEXT: .ascii "ctx" # string offset=44 102; CHECK-NEXT: .byte 0 103; CHECK-NEXT: .ascii "bpf_prog" # string offset=48 104; CHECK-NEXT: .byte 0 105; CHECK-NEXT: .ascii ".text" # string offset=57 106; CHECK-NEXT: .byte 0 107; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=63 108; CHECK-NEXT: .byte 0 109; CHECK-NEXT: .ascii "0:1:0" # string offset=100 110; CHECK-NEXT: .byte 0 111; CHECK-NEXT: .section .BTF.ext,"",@progbits 112; CHECK-NEXT: .short 60319 # 0xeb9f 113; CHECK-NEXT: .byte 1 114; CHECK-NEXT: .byte 0 115; CHECK-NEXT: .long 32 116; CHECK-NEXT: .long 0 117; CHECK-NEXT: .long 20 118; CHECK-NEXT: .long 20 119; CHECK-NEXT: .long {{[0-9]+}} 120; CHECK-NEXT: .long {{[0-9]+}} 121; CHECK-NEXT: .long 28 122; CHECK-NEXT: .long 8 # FuncInfo 123 124; CHECK: .long 16 # FieldReloc 125; CHECK-NEXT: .long 57 # Field reloc section string offset=57 126; CHECK-NEXT: .long 1 127; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 128; CHECK-NEXT: .long 2 129; CHECK-NEXT: .long 100 130; CHECK-NEXT: .long 0 131 132; Function Attrs: argmemonly nounwind 133declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 134 135; Function Attrs: nounwind readnone 136declare ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr, i32 immarg, i32 immarg) #2 137 138; Function Attrs: nounwind readnone 139declare ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr, i32 immarg, i32 immarg) #2 140 141; Function Attrs: argmemonly nounwind 142declare void @llvm.lifetime.end.p0(i64 immarg, ptr 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" "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" } 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