; RUN: opt -O2 %s | llvm-dis > %t1 ; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s ; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s ; Source code: ; struct sk_buff { ; int i; ; struct net_device *dev; ; }; ; #define _(x) (__builtin_preserve_access_index(x)) ; static int (*bpf_probe_read)(ptr dst, int size, ptr unsafe_ptr) ; = (ptr) 4; ; ; int bpf_prog(struct sk_buff *ctx) { ; struct net_device *dev = 0; ; bpf_probe_read(&dev, sizeof(dev), _(&ctx->dev)); ; return dev != 0; ; } ; Compilation flag: ; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c target triple = "bpf" %struct.sk_buff = type { i32, ptr } %struct.net_device = type opaque ; Function Attrs: nounwind define dso_local i32 @bpf_prog(ptr) local_unnamed_addr #0 !dbg !15 { %2 = alloca ptr, align 8 call void @llvm.dbg.value(metadata ptr %0, metadata !26, metadata !DIExpression()), !dbg !28 call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4, !dbg !29 call void @llvm.dbg.value(metadata ptr null, metadata !27, metadata !DIExpression()), !dbg !28 store ptr null, ptr %2, align 8, !dbg !30, !tbaa !31 %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 %4 = call i32 inttoptr (i64 4 to ptr)(ptr nonnull %2, i32 8, ptr %3) #4, !dbg !36 %5 = load ptr, ptr %2, align 8, !dbg !37, !tbaa !31 call void @llvm.dbg.value(metadata ptr %5, metadata !27, metadata !DIExpression()), !dbg !28 %6 = icmp ne ptr %5, null, !dbg !38 %7 = zext i1 %6 to i32, !dbg !38 call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4, !dbg !39 ret i32 %7, !dbg !40 } ; CHECK: .section .BTF,"",@progbits ; CHECK-NEXT: .short 60319 # 0xeb9f ; CHECK-NEXT: .byte 1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .long 24 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long 120 ; CHECK-NEXT: .long 120 ; CHECK-NEXT: .long 90 ; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1) ; CHECK-NEXT: .long 33554432 # 0x2000000 ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2) ; CHECK-NEXT: .long 67108866 # 0x4000002 ; CHECK-NEXT: .long 16 ; CHECK-NEXT: .long 9 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 0 # 0x0 ; CHECK-NEXT: .long 11 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long 64 # 0x40 ; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3) ; CHECK-NEXT: .long 16777216 # 0x1000000 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long 16777248 # 0x1000020 ; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 4) ; CHECK-NEXT: .long 33554432 # 0x2000000 ; CHECK-NEXT: .long 5 ; CHECK-NEXT: .long 19 # BTF_KIND_FWD(id = 5) ; CHECK-NEXT: .long 117440512 # 0x7000000 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 6) ; CHECK-NEXT: .long 218103809 # 0xd000001 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long 30 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long 34 # BTF_KIND_FUNC(id = 7) ; CHECK-NEXT: .long 201326593 # 0xc000001 ; CHECK-NEXT: .long 6 ; CHECK-NEXT: .byte 0 # string offset=0 ; CHECK-NEXT: .ascii "sk_buff" # string offset=1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .byte 105 # string offset=9 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "dev" # string offset=11 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "int" # string offset=15 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "net_device" # string offset=19 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "ctx" # string offset=30 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "bpf_prog" # string offset=34 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii ".text" # string offset=43 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=49 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .ascii "0:1" # string offset=86 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .section .BTF.ext,"",@progbits ; CHECK-NEXT: .short 60319 # 0xeb9f ; CHECK-NEXT: .byte 1 ; CHECK-NEXT: .byte 0 ; CHECK-NEXT: .long 32 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long 20 ; CHECK-NEXT: .long 20 ; CHECK-NEXT: .long 124 ; CHECK-NEXT: .long 144 ; CHECK-NEXT: .long 28 ; CHECK-NEXT: .long 8 # FuncInfo ; CHECK: .long 16 # FieldReloc ; CHECK-NEXT: .long 43 # Field reloc section string offset=43 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 86 ; CHECK-NEXT: .long 0 ; Function Attrs: argmemonly nounwind declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nounwind readnone declare ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr, i32 immarg, i32 immarg) #2 ; Function Attrs: argmemonly nounwind declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 ; Function Attrs: nounwind readnone speculatable declare void @llvm.dbg.value(metadata, metadata, metadata) #3 attributes #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" } attributes #1 = { argmemonly nounwind } attributes #2 = { nounwind readnone } attributes #3 = { nounwind readnone speculatable } attributes #4 = { nounwind } !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!11, !12, !13} !llvm.ident = !{!14} !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) !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm") !2 = !{} !3 = !{!4} !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) !5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 6, type: !6, isLocal: true, isDefinition: true) !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) !7 = !DISubroutineType(types: !8) !8 = !{!9, !10, !9, !10} !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) !11 = !{i32 2, !"Dwarf Version", i32 4} !12 = !{i32 2, !"Debug Info Version", i32 3} !13 = !{i32 1, !"wchar_size", i32 4} !14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"} !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) !16 = !DISubroutineType(types: !17) !17 = !{!9, !18} !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64) !19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 1, size: 128, elements: !20) !20 = !{!21, !22} !21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 2, baseType: !9, size: 32) !22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 3, baseType: !23, size: 64, offset: 64) !23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !24, size: 64) !24 = !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 3, flags: DIFlagFwdDecl) !25 = !{!26, !27} !26 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 9, type: !18) !27 = !DILocalVariable(name: "dev", scope: !15, file: !1, line: 10, type: !23) !28 = !DILocation(line: 0, scope: !15) !29 = !DILocation(line: 10, column: 3, scope: !15) !30 = !DILocation(line: 10, column: 22, scope: !15) !31 = !{!32, !32, i64 0} !32 = !{!"any pointer", !33, i64 0} !33 = !{!"omnipotent char", !34, i64 0} !34 = !{!"Simple C/C++ TBAA"} !35 = !DILocation(line: 11, column: 37, scope: !15) !36 = !DILocation(line: 11, column: 3, scope: !15) !37 = !DILocation(line: 12, column: 10, scope: !15) !38 = !DILocation(line: 12, column: 14, scope: !15) !39 = !DILocation(line: 13, column: 1, scope: !15) !40 = !DILocation(line: 12, column: 3, scope: !15)