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; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s 4; RUN: llc -march=bpfeb -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s 5; Source code: 6; struct sk_buff { 7; int i; 8; struct net_device *dev; 9; }; 10; #define _(x) (__builtin_preserve_access_index(x)) 11; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) 12; = (void *) 4; 13; 14; int bpf_prog(struct sk_buff *ctx) { 15; struct net_device *dev = 0; 16; bpf_probe_read(&dev, sizeof(dev), _(&ctx->dev)); 17; return dev != 0; 18; } 19; Compilation flag: 20; clang -target bpf -O2 -g -S -emit-llvm test.c 21 22%struct.sk_buff = type { i32, %struct.net_device* } 23%struct.net_device = type opaque 24 25; Function Attrs: nounwind 26define dso_local i32 @bpf_prog(%struct.sk_buff*) local_unnamed_addr #0 !dbg !15 { 27 %2 = alloca %struct.net_device*, align 8 28 call void @llvm.dbg.value(metadata %struct.sk_buff* %0, metadata !26, metadata !DIExpression()), !dbg !28 29 %3 = bitcast %struct.net_device** %2 to i8*, !dbg !29 30 call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %3) #4, !dbg !29 31 call void @llvm.dbg.value(metadata %struct.net_device* null, metadata !27, metadata !DIExpression()), !dbg !28 32 store %struct.net_device* null, %struct.net_device** %2, align 8, !dbg !30, !tbaa !31 33 %4 = tail call %struct.net_device** @llvm.preserve.struct.access.index.p0p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff* %0, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !19 34 %5 = bitcast %struct.net_device** %4 to i8*, !dbg !35 35 %6 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 8, i8* %5) #4, !dbg !36 36 %7 = load %struct.net_device*, %struct.net_device** %2, align 8, !dbg !37, !tbaa !31 37 call void @llvm.dbg.value(metadata %struct.net_device* %7, metadata !27, metadata !DIExpression()), !dbg !28 38 %8 = icmp ne %struct.net_device* %7, null, !dbg !38 39 %9 = zext i1 %8 to i32, !dbg !38 40 call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %3) #4, !dbg !39 41 ret i32 %9, !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 120 51; CHECK-NEXT: .long 120 52; CHECK-NEXT: .long 90 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 16 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 64 # 0x40 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 0 # BTF_KIND_PTR(id = 4) 70; CHECK-NEXT: .long 33554432 # 0x2000000 71; CHECK-NEXT: .long 5 72; CHECK-NEXT: .long 19 # BTF_KIND_FWD(id = 5) 73; CHECK-NEXT: .long 117440512 # 0x7000000 74; CHECK-NEXT: .long 0 75; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 6) 76; CHECK-NEXT: .long 218103809 # 0xd000001 77; CHECK-NEXT: .long 3 78; CHECK-NEXT: .long 30 79; CHECK-NEXT: .long 1 80; CHECK-NEXT: .long 34 # BTF_KIND_FUNC(id = 7) 81; CHECK-NEXT: .long 201326592 # 0xc000000 82; CHECK-NEXT: .long 6 83; CHECK-NEXT: .byte 0 # string offset=0 84; CHECK-NEXT: .ascii "sk_buff" # string offset=1 85; CHECK-NEXT: .byte 0 86; CHECK-NEXT: .byte 105 # string offset=9 87; CHECK-NEXT: .byte 0 88; CHECK-NEXT: .ascii "dev" # string offset=11 89; CHECK-NEXT: .byte 0 90; CHECK-NEXT: .ascii "int" # string offset=15 91; CHECK-NEXT: .byte 0 92; CHECK-NEXT: .ascii "net_device" # string offset=19 93; CHECK-NEXT: .byte 0 94; CHECK-NEXT: .ascii "ctx" # string offset=30 95; CHECK-NEXT: .byte 0 96; CHECK-NEXT: .ascii "bpf_prog" # string offset=34 97; CHECK-NEXT: .byte 0 98; CHECK-NEXT: .ascii ".text" # string offset=43 99; CHECK-NEXT: .byte 0 100; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=49 101; CHECK-NEXT: .byte 0 102; CHECK-NEXT: .ascii "0:1" # string offset=86 103; CHECK-NEXT: .byte 0 104; CHECK-NEXT: .section .BTF.ext,"",@progbits 105; CHECK-NEXT: .short 60319 # 0xeb9f 106; CHECK-NEXT: .byte 1 107; CHECK-NEXT: .byte 0 108; CHECK-NEXT: .long 32 109; CHECK-NEXT: .long 0 110; CHECK-NEXT: .long 20 111; CHECK-NEXT: .long 20 112; CHECK-NEXT: .long 124 113; CHECK-NEXT: .long 144 114; CHECK-NEXT: .long 28 115; CHECK-NEXT: .long 8 # FuncInfo 116 117; CHECK: .long 16 # FieldReloc 118; CHECK-NEXT: .long 43 # Field reloc section string offset=43 119; CHECK-NEXT: .long 1 120; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 121; CHECK-NEXT: .long 2 122; CHECK-NEXT: .long 86 123; CHECK-NEXT: .long 0 124 125; Function Attrs: argmemonly nounwind 126declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 127 128; Function Attrs: nounwind readnone 129declare %struct.net_device** @llvm.preserve.struct.access.index.p0p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff*, i32 immarg, i32 immarg) #2 130 131; Function Attrs: argmemonly nounwind 132declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 133 134; Function Attrs: nounwind readnone speculatable 135declare void @llvm.dbg.value(metadata, metadata, metadata) #3 136 137attributes #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" } 138attributes #1 = { argmemonly nounwind } 139attributes #2 = { nounwind readnone } 140attributes #3 = { nounwind readnone speculatable } 141attributes #4 = { nounwind } 142 143!llvm.dbg.cu = !{!0} 144!llvm.module.flags = !{!11, !12, !13} 145!llvm.ident = !{!14} 146 147!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) 148!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") 149!2 = !{} 150!3 = !{!4} 151!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 152!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 6, type: !6, isLocal: true, isDefinition: true) 153!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 154!7 = !DISubroutineType(types: !8) 155!8 = !{!9, !10, !9, !10} 156!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 157!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) 158!11 = !{i32 2, !"Dwarf Version", i32 4} 159!12 = !{i32 2, !"Debug Info Version", i32 3} 160!13 = !{i32 1, !"wchar_size", i32 4} 161!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} 162!15 = distinct !DISubprogram(name: "bpf_prog", scope: !1, file: !1, line: 9, type: !16, scopeLine: 9, flags: DIFlagPrototyped, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !25) 163!16 = !DISubroutineType(types: !17) 164!17 = !{!9, !18} 165!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 166!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 1, size: 128, elements: !20) 167!20 = !{!21, !22} 168!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 2, baseType: !9, size: 32) 169!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 3, baseType: !23, size: 64, offset: 64) 170!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !24, size: 64) 171!24 = !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 3, flags: DIFlagFwdDecl) 172!25 = !{!26, !27} 173!26 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 9, type: !18) 174!27 = !DILocalVariable(name: "dev", scope: !15, file: !1, line: 10, type: !23) 175!28 = !DILocation(line: 0, scope: !15) 176!29 = !DILocation(line: 10, column: 3, scope: !15) 177!30 = !DILocation(line: 10, column: 22, scope: !15) 178!31 = !{!32, !32, i64 0} 179!32 = !{!"any pointer", !33, i64 0} 180!33 = !{!"omnipotent char", !34, i64 0} 181!34 = !{!"Simple C/C++ TBAA"} 182!35 = !DILocation(line: 11, column: 37, scope: !15) 183!36 = !DILocation(line: 11, column: 3, scope: !15) 184!37 = !DILocation(line: 12, column: 10, scope: !15) 185!38 = !DILocation(line: 12, column: 14, scope: !15) 186!39 = !DILocation(line: 13, column: 1, scope: !15) 187!40 = !DILocation(line: 12, column: 3, scope: !15) 188