1 ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s
4 ; struct s { int a; int b; };
5 ; #define _(x) (__builtin_preserve_access_index(x))
6 ; int get_value(const void *addr);
7 ; int test(struct s *arg) { return get_value(_(&arg->b)); }
8 ; Compiler flag to generate IR:
9 ; clang -target bpf -S -O2 -g -emit-llvm test.c
11 %struct.s = type { i32, i32 }
13 ; Function Attrs: nounwind
14 define dso_local i32 @test(%struct.s* %arg) local_unnamed_addr #0 !dbg !7 {
16 call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !17, metadata !DIExpression()), !dbg !18
17 %0 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s* %arg, i32 1, i32 1), !dbg !19, !llvm.preserve.access.index !12
18 %1 = bitcast i32* %0 to i8*, !dbg !19
19 %call = tail call i32 @get_value(i8* %1) #4, !dbg !20
20 ret i32 %call, !dbg !21
24 ; CHECK: [[RELOC:.Ltmp[0-9]+]]
27 ; CHECK: call get_value
30 ; CHECK: .section .BTF.ext,"",@progbits
31 ; CHECK: .long 16 # FieldReloc
32 ; CHECK-NEXT: .long 20 # Field reloc section string offset=20
34 ; CHECK-NEXT: .long [[RELOC]]
36 ; CHECK-NEXT: .long 26
39 declare dso_local i32 @get_value(i8*) local_unnamed_addr #1
41 ; Function Attrs: nounwind readnone
42 declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s*, i32 immarg, i32 immarg) #2
44 ; Function Attrs: nounwind readnone speculatable
45 declare void @llvm.dbg.value(metadata, metadata, metadata) #3
47 attributes #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" }
48 attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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" }
49 attributes #2 = { nounwind readnone }
50 attributes #3 = { nounwind readnone speculatable }
51 attributes #4 = { nounwind }
54 !llvm.module.flags = !{!3, !4, !5}
57 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
58 !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
60 !3 = !{i32 2, !"Dwarf Version", i32 4}
61 !4 = !{i32 2, !"Debug Info Version", i32 3}
62 !5 = !{i32 1, !"wchar_size", i32 4}
63 !6 = !{!"clang version 9.0.0 (trunk 365789)"}
64 !7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
65 !8 = !DISubroutineType(types: !9)
67 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
68 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
69 !12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !13)
71 !14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
72 !15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32, offset: 32)
74 !17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11)
75 !18 = !DILocation(line: 0, scope: !7)
76 !19 = !DILocation(line: 4, column: 44, scope: !7)
77 !20 = !DILocation(line: 4, column: 34, scope: !7)
78 !21 = !DILocation(line: 4, column: 27, scope: !7)