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 v1 { int a; int b; }; 6; struct v2 { int c; int d; }; 7; struct v3 { char c; struct v2 d; }; 8; #define _(x) (__builtin_preserve_access_index(x)) 9; #define cast_to_v1(x) ((struct v1 *)(x)) 10; int get_value(const int *arg); 11; int test(struct v3 *arg) { 12; return get_value(_(&cast_to_v1(&arg->d)->b)); 13; } 14; Compilation flag: 15; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 16 17target triple = "bpf" 18 19%struct.v3 = type { i8, %struct.v2 } 20%struct.v2 = type { i32, i32 } 21%struct.v1 = type { i32, i32 } 22 23; Function Attrs: nounwind 24define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !14 { 25entry: 26 call void @llvm.dbg.value(metadata ptr %arg, metadata !28, metadata !DIExpression()), !dbg !29 27 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.v2s.p0.v3s(ptr elementtype(%struct.v3) %arg, i32 1, i32 1), !dbg !30, !llvm.preserve.access.index !18 28 %1 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.v1s(ptr elementtype(%struct.v1) %0, i32 1, i32 1), !dbg !30, !llvm.preserve.access.index !5 29 %call = tail call i32 @get_value(ptr %1) #4, !dbg !31 30 ret i32 %call, !dbg !32 31} 32 33; CHECK: r2 = 4 34; CHECK: r1 += r2 35; CHECK: r2 = 4 36; CHECK: r1 += r2 37; CHECK: call get_value 38 39; CHECK: .long 1 # BTF_KIND_STRUCT(id = [[V3_TID:[0-9]+]]) 40; CHECK: .long 81 # BTF_KIND_STRUCT(id = [[V1_TID:[0-9]+]]) 41 42; CHECK: .ascii "v3" # string offset=1 43; CHECK-NEXT: .byte 0 44; CHECK: .ascii ".text" # string offset=[[SEC_STR:[0-9]+]] 45; CHECK-NEXT: .byte 0 46; CHECK: .ascii "0:1" # string offset=[[ACCESS_STR:[0-9]+]] 47; CHECK-NEXT: .byte 0 48; CHECK: .ascii "v1" # string offset=81 49; CHECK-NEXT: .byte 0 50 51; CHECK: .long 16 # FieldReloc 52; CHECK-NEXT: .long [[SEC_STR]] # Field reloc section string offset=[[SEC_STR]] 53; CHECK-NEXT: .long 2 54; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 55; CHECK-NEXT: .long [[V3_TID]] 56; CHECK-NEXT: .long [[ACCESS_STR]] 57; CHECK-NEXT: .long 0 58; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 59; CHECK-NEXT: .long [[V1_TID]] 60; CHECK-NEXT: .long [[ACCESS_STR]] 61; CHECK-NEXT: .long 0 62 63declare dso_local i32 @get_value(ptr) local_unnamed_addr #1 64 65; Function Attrs: nounwind readnone 66declare ptr @llvm.preserve.struct.access.index.p0.v2s.p0.v3s(ptr, i32, i32) #2 67 68; Function Attrs: nounwind readnone 69declare ptr @llvm.preserve.struct.access.index.p0.p0.v1s(ptr, i32, i32) #2 70 71; Function Attrs: nounwind readnone speculatable willreturn 72declare void @llvm.dbg.value(metadata, metadata, metadata) #3 73 74attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "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" } 75attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="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" } 76attributes #2 = { nounwind readnone } 77attributes #3 = { nounwind readnone speculatable willreturn } 78attributes #4 = { nounwind } 79 80!llvm.dbg.cu = !{!0} 81!llvm.module.flags = !{!10, !11, !12} 82!llvm.ident = !{!13} 83 84!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None) 85!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast") 86!2 = !{} 87!3 = !{!4} 88!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64) 89!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v1", file: !1, line: 1, size: 64, elements: !6) 90!6 = !{!7, !9} 91!7 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !5, file: !1, line: 1, baseType: !8, size: 32) 92!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 93!9 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !5, file: !1, line: 1, baseType: !8, size: 32, offset: 32) 94!10 = !{i32 2, !"Dwarf Version", i32 4} 95!11 = !{i32 2, !"Debug Info Version", i32 3} 96!12 = !{i32 1, !"wchar_size", i32 4} 97!13 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"} 98!14 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 7, type: !15, scopeLine: 7, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !27) 99!15 = !DISubroutineType(types: !16) 100!16 = !{!8, !17} 101!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64) 102!18 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !1, line: 3, size: 96, elements: !19) 103!19 = !{!20, !22} 104!20 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !18, file: !1, line: 3, baseType: !21, size: 8) 105!21 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 106!22 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !18, file: !1, line: 3, baseType: !23, size: 64, offset: 32) 107!23 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v2", file: !1, line: 2, size: 64, elements: !24) 108!24 = !{!25, !26} 109!25 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !23, file: !1, line: 2, baseType: !8, size: 32) 110!26 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !23, file: !1, line: 2, baseType: !8, size: 32, offset: 32) 111!27 = !{!28} 112!28 = !DILocalVariable(name: "arg", arg: 1, scope: !14, file: !1, line: 7, type: !17) 113!29 = !DILocation(line: 0, scope: !14) 114!30 = !DILocation(line: 8, column: 20, scope: !14) 115!31 = !DILocation(line: 8, column: 10, scope: !14) 116!32 = !DILocation(line: 8, column: 3, scope: !14) 117