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 sk_buff { 6; int i; 7; struct net_device *dev; 8; }; 9; #define _(x) (__builtin_preserve_access_index(x)) 10; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) 11; = (void *) 4; 12; 13; int bpf_prog(struct sk_buff *ctx) { 14; struct net_device *dev = 0; 15; bpf_probe_read(&dev, sizeof(dev), _(&ctx->dev)); 16; return dev != 0; 17; } 18; Compilation flag: 19; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 20 21target triple = "bpf" 22 23%struct.sk_buff = type { i32, %struct.net_device* } 24%struct.net_device = type opaque 25 26; Function Attrs: nounwind 27define dso_local i32 @bpf_prog(%struct.sk_buff*) local_unnamed_addr #0 !dbg !15 { 28 %2 = alloca %struct.net_device*, align 8 29 call void @llvm.dbg.value(metadata %struct.sk_buff* %0, metadata !26, metadata !DIExpression()), !dbg !28 30 %3 = bitcast %struct.net_device** %2 to i8*, !dbg !29 31 call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %3) #4, !dbg !29 32 call void @llvm.dbg.value(metadata %struct.net_device* null, metadata !27, metadata !DIExpression()), !dbg !28 33 store %struct.net_device* null, %struct.net_device** %2, align 8, !dbg !30, !tbaa !31 34 %4 = tail call %struct.net_device** @llvm.preserve.struct.access.index.p0p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff* elementtype(%struct.sk_buff) %0, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !19 35 %5 = bitcast %struct.net_device** %4 to i8*, !dbg !35 36 %6 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 8, i8* %5) #4, !dbg !36 37 %7 = load %struct.net_device*, %struct.net_device** %2, align 8, !dbg !37, !tbaa !31 38 call void @llvm.dbg.value(metadata %struct.net_device* %7, metadata !27, metadata !DIExpression()), !dbg !28 39 %8 = icmp ne %struct.net_device* %7, null, !dbg !38 40 %9 = zext i1 %8 to i32, !dbg !38 41 call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %3) #4, !dbg !39 42 ret i32 %9, !dbg !40 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 120 52; CHECK-NEXT: .long 120 53; CHECK-NEXT: .long 90 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 16 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 4 65; CHECK-NEXT: .long 64 # 0x40 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 0 # BTF_KIND_PTR(id = 4) 71; CHECK-NEXT: .long 33554432 # 0x2000000 72; CHECK-NEXT: .long 5 73; CHECK-NEXT: .long 19 # BTF_KIND_FWD(id = 5) 74; CHECK-NEXT: .long 117440512 # 0x7000000 75; CHECK-NEXT: .long 0 76; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 6) 77; CHECK-NEXT: .long 218103809 # 0xd000001 78; CHECK-NEXT: .long 3 79; CHECK-NEXT: .long 30 80; CHECK-NEXT: .long 1 81; CHECK-NEXT: .long 34 # BTF_KIND_FUNC(id = 7) 82; CHECK-NEXT: .long 201326593 # 0xc000001 83; CHECK-NEXT: .long 6 84; CHECK-NEXT: .byte 0 # string offset=0 85; CHECK-NEXT: .ascii "sk_buff" # string offset=1 86; CHECK-NEXT: .byte 0 87; CHECK-NEXT: .byte 105 # string offset=9 88; CHECK-NEXT: .byte 0 89; CHECK-NEXT: .ascii "dev" # string offset=11 90; CHECK-NEXT: .byte 0 91; CHECK-NEXT: .ascii "int" # string offset=15 92; CHECK-NEXT: .byte 0 93; CHECK-NEXT: .ascii "net_device" # string offset=19 94; CHECK-NEXT: .byte 0 95; CHECK-NEXT: .ascii "ctx" # string offset=30 96; CHECK-NEXT: .byte 0 97; CHECK-NEXT: .ascii "bpf_prog" # string offset=34 98; CHECK-NEXT: .byte 0 99; CHECK-NEXT: .ascii ".text" # string offset=43 100; CHECK-NEXT: .byte 0 101; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=49 102; CHECK-NEXT: .byte 0 103; CHECK-NEXT: .ascii "0:1" # string offset=86 104; CHECK-NEXT: .byte 0 105; CHECK-NEXT: .section .BTF.ext,"",@progbits 106; CHECK-NEXT: .short 60319 # 0xeb9f 107; CHECK-NEXT: .byte 1 108; CHECK-NEXT: .byte 0 109; CHECK-NEXT: .long 32 110; CHECK-NEXT: .long 0 111; CHECK-NEXT: .long 20 112; CHECK-NEXT: .long 20 113; CHECK-NEXT: .long 124 114; CHECK-NEXT: .long 144 115; CHECK-NEXT: .long 28 116; CHECK-NEXT: .long 8 # FuncInfo 117 118; CHECK: .long 16 # FieldReloc 119; CHECK-NEXT: .long 43 # Field reloc section string offset=43 120; CHECK-NEXT: .long 1 121; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 122; CHECK-NEXT: .long 2 123; CHECK-NEXT: .long 86 124; CHECK-NEXT: .long 0 125 126; Function Attrs: argmemonly nounwind 127declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1 128 129; Function Attrs: nounwind readnone 130declare %struct.net_device** @llvm.preserve.struct.access.index.p0p0s_struct.net_devices.p0s_struct.sk_buffs(%struct.sk_buff*, i32 immarg, i32 immarg) #2 131 132; Function Attrs: argmemonly nounwind 133declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1 134 135; Function Attrs: nounwind readnone speculatable 136declare void @llvm.dbg.value(metadata, metadata, metadata) #3 137 138attributes #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" } 139attributes #1 = { argmemonly nounwind } 140attributes #2 = { nounwind readnone } 141attributes #3 = { nounwind readnone speculatable } 142attributes #4 = { nounwind } 143 144!llvm.dbg.cu = !{!0} 145!llvm.module.flags = !{!11, !12, !13} 146!llvm.ident = !{!14} 147 148!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) 149!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") 150!2 = !{} 151!3 = !{!4} 152!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) 153!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 6, type: !6, isLocal: true, isDefinition: true) 154!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 155!7 = !DISubroutineType(types: !8) 156!8 = !{!9, !10, !9, !10} 157!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 158!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) 159!11 = !{i32 2, !"Dwarf Version", i32 4} 160!12 = !{i32 2, !"Debug Info Version", i32 3} 161!13 = !{i32 1, !"wchar_size", i32 4} 162!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} 163!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) 164!16 = !DISubroutineType(types: !17) 165!17 = !{!9, !18} 166!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) 167!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 1, size: 128, elements: !20) 168!20 = !{!21, !22} 169!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 2, baseType: !9, size: 32) 170!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 3, baseType: !23, size: 64, offset: 64) 171!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !24, size: 64) 172!24 = !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 3, flags: DIFlagFwdDecl) 173!25 = !{!26, !27} 174!26 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 9, type: !18) 175!27 = !DILocalVariable(name: "dev", scope: !15, file: !1, line: 10, type: !23) 176!28 = !DILocation(line: 0, scope: !15) 177!29 = !DILocation(line: 10, column: 3, scope: !15) 178!30 = !DILocation(line: 10, column: 22, scope: !15) 179!31 = !{!32, !32, i64 0} 180!32 = !{!"any pointer", !33, i64 0} 181!33 = !{!"omnipotent char", !34, i64 0} 182!34 = !{!"Simple C/C++ TBAA"} 183!35 = !DILocation(line: 11, column: 37, scope: !15) 184!36 = !DILocation(line: 11, column: 3, scope: !15) 185!37 = !DILocation(line: 12, column: 10, scope: !15) 186!38 = !DILocation(line: 12, column: 14, scope: !15) 187!39 = !DILocation(line: 13, column: 1, scope: !15) 188!40 = !DILocation(line: 12, column: 3, scope: !15) 189