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; typedef struct v1 __v1; 7; typedef int __int; 8; struct v3 { char c; __int d[40]; }; 9; typedef struct v3 __v3; 10; #define _(x) (__builtin_preserve_access_index(x)) 11; #define cast_to_v1(x) ((__v1 *)(x)) 12; int get_value(const int *arg); 13; int test(__v3 *arg) { 14; return get_value(_(&cast_to_v1(&arg->d[4])->b)); 15; } 16; Compilation flag: 17; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 18 19target triple = "bpf" 20 21%struct.v3 = type { i8, [40 x i32] } 22%struct.v1 = type { i32, i32 } 23 24; Function Attrs: nounwind 25define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !19 { 26entry: 27 call void @llvm.dbg.value(metadata ptr %arg, metadata !30, metadata !DIExpression()), !dbg !31 28 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.v3) %arg, i32 1, i32 1), !dbg !32, !llvm.preserve.access.index !24 29 %1 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([40 x i32]) %0, i32 1, i32 4), !dbg !32, !llvm.preserve.access.index !11 30 %2 = bitcast ptr %1 to ptr, !dbg !32 31 %3 = tail call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.v1) %2, i32 1, i32 1), !dbg !32, !llvm.preserve.access.index !6 32 %call = tail call i32 @get_value(ptr %3) #4, !dbg !33 33 ret i32 %call, !dbg !34 34} 35 36; CHECK: r2 = 20 37; CHECK: r1 += r2 38; CHECK: r2 = 4 39; CHECK: r1 += r2 40; CHECK: call get_value 41 42; CHECK: .long 6 # BTF_KIND_STRUCT(id = [[TID1:[0-9]+]]) 43; CHECK: .long 111 # BTF_KIND_STRUCT(id = [[TID2:[0-9]+]]) 44 45; CHECK: .ascii "v3" # string offset=6 46; CHECK: .ascii ".text" # string offset=57 47; CHECK: .ascii "0:1:4" # string offset=63 48; CHECK: .ascii "v1" # string offset=111 49; CHECK: .ascii "0:1" # string offset=118 50 51; CHECK: .long 16 # FieldReloc 52; CHECK-NEXT: .long 57 # Field reloc section string offset=57 53; CHECK-NEXT: .long 2 54; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 55; CHECK-NEXT: .long [[TID1]] 56; CHECK-NEXT: .long 63 57; CHECK-NEXT: .long 0 58; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 59; CHECK-NEXT: .long [[TID2]] 60; CHECK-NEXT: .long 118 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.p0(ptr, i32, i32) #2 67 68; Function Attrs: nounwind readnone 69declare ptr @llvm.preserve.array.access.index.p0.p0(ptr, i32, i32) #2 70 71; Function Attrs: nounwind readnone 72 73; Function Attrs: nounwind readnone speculatable willreturn 74declare void @llvm.dbg.value(metadata, metadata, metadata) #3 75 76attributes #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" } 77attributes #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" } 78attributes #2 = { nounwind readnone } 79attributes #3 = { nounwind readnone speculatable willreturn } 80attributes #4 = { nounwind } 81 82!llvm.dbg.cu = !{!0} 83!llvm.module.flags = !{!15, !16, !17} 84!llvm.ident = !{!18} 85 86!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) 87!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast") 88!2 = !{} 89!3 = !{!4, !11} 90!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64) 91!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6) 92!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v1", file: !1, line: 1, size: 64, elements: !7) 93!7 = !{!8, !10} 94!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32) 95!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 96!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32, offset: 32) 97!11 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 1280, elements: !13) 98!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !1, line: 3, baseType: !9) 99!13 = !{!14} 100!14 = !DISubrange(count: 40) 101!15 = !{i32 2, !"Dwarf Version", i32 4} 102!16 = !{i32 2, !"Debug Info Version", i32 3} 103!17 = !{i32 1, !"wchar_size", i32 4} 104!18 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"} 105!19 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 9, type: !20, scopeLine: 9, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !29) 106!20 = !DISubroutineType(types: !21) 107!21 = !{!9, !22} 108!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !23, size: 64) 109!23 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 5, baseType: !24) 110!24 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !1, line: 4, size: 1312, elements: !25) 111!25 = !{!26, !28} 112!26 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !24, file: !1, line: 4, baseType: !27, size: 8) 113!27 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 114!28 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !24, file: !1, line: 4, baseType: !11, size: 1280, offset: 32) 115!29 = !{!30} 116!30 = !DILocalVariable(name: "arg", arg: 1, scope: !19, file: !1, line: 9, type: !22) 117!31 = !DILocation(line: 0, scope: !19) 118!32 = !DILocation(line: 10, column: 20, scope: !19) 119!33 = !DILocation(line: 10, column: 10, scope: !19) 120!34 = !DILocation(line: 10, column: 3, scope: !19) 121