xref: /llvm-project/llvm/test/CodeGen/BPF/CORE/offset-reloc-cast-union-1.ll (revision ff9af4c43ad71eeba2cabe99609cfaa0fd54c1d0) 
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;   union v1 { int a; int b; };
6;   typedef union v1 __v1;
7;   union v2 { int c; int d; };
8;   typedef union v2 __v2;
9;   union v3 { char c; volatile const __v2 d; };
10;   typedef union v3 __v3;
11;   #define _(x) (__builtin_preserve_access_index(x))
12;   #define cast_to_v1(x) ((__v1 *)(x))
13;   int get_value(const int *arg);
14;   int test(__v3 *arg) {
15;     return get_value(_(&cast_to_v1(&arg->d)->b));
16;   }
17; Compilation flag:
18;   clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
19
20target triple = "bpf"
21
22%union.v3 = type { %union.v2 }
23%union.v2 = type { i32 }
24%union.v1 = type { i32 }
25
26; Function Attrs: nounwind
27define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !15 {
28entry:
29  call void @llvm.dbg.value(metadata ptr %arg, metadata !33, metadata !DIExpression()), !dbg !34
30  %0 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %arg, i32 1), !dbg !35, !llvm.preserve.access.index !20
31  %1 = bitcast ptr %0 to ptr, !dbg !35
32  %2 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %1, i32 1), !dbg !35, !llvm.preserve.access.index !6
33  %b = getelementptr inbounds %union.v1, ptr %2, i64 0, i32 0, !dbg !35
34  %call = tail call i32 @get_value(ptr %b) #4, !dbg !36
35  ret i32 %call, !dbg !37
36}
37
38; CHECK:             r2 = 0
39; CHECK:             r1 += r2
40; CHECK:             r2 = 0
41; CHECK:             r1 += r2
42; CHECK:             call get_value
43
44; CHECK:             .long   6                       # BTF_KIND_UNION(id = [[TID1:[0-9]+]])
45; CHECK:             .long   91                      # BTF_KIND_UNION(id = [[TID2:[0-9]+]])
46
47; CHECK:             .ascii  "v3"                    # string offset=6
48; CHECK:             .ascii  ".text"                 # string offset=39
49; CHECK:             .ascii  "0:1"                   # string offset=45
50; CHECK:             .ascii  "v1"                    # string offset=91
51
52; CHECK:             .long   16                      # FieldReloc
53; CHECK-NEXT:        .long   39                      # Field reloc section string offset=39
54; CHECK-NEXT:        .long   2
55; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
56; CHECK-NEXT:        .long   [[TID1]]
57; CHECK-NEXT:        .long   45
58; CHECK-NEXT:        .long   0
59; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
60; CHECK-NEXT:        .long   [[TID2]]
61; CHECK-NEXT:        .long   45
62; CHECK-NEXT:        .long   0
63
64declare dso_local i32 @get_value(ptr) local_unnamed_addr #1
65
66; Function Attrs: nounwind readnone
67declare ptr @llvm.preserve.union.access.index.p0.p0(ptr, i32) #2
68
69; Function Attrs: nounwind readnone
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 = !{!11, !12, !13}
82!llvm.ident = !{!14}
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 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6)
90!6 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v1", file: !1, line: 1, size: 32, elements: !7)
91!7 = !{!8, !10}
92!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32)
93!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
94!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32)
95!11 = !{i32 2, !"Dwarf Version", i32 4}
96!12 = !{i32 2, !"Debug Info Version", i32 3}
97!13 = !{i32 1, !"wchar_size", i32 4}
98!14 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"}
99!15 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 10, type: !16, scopeLine: 10, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !32)
100!16 = !DISubroutineType(types: !17)
101!17 = !{!9, !18}
102!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
103!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 6, baseType: !20)
104!20 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v3", file: !1, line: 5, size: 32, elements: !21)
105!21 = !{!22, !24}
106!22 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !20, file: !1, line: 5, baseType: !23, size: 8)
107!23 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
108!24 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !20, file: !1, line: 5, baseType: !25, size: 32)
109!25 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !26)
110!26 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !27)
111!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v2", file: !1, line: 4, baseType: !28)
112!28 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v2", file: !1, line: 3, size: 32, elements: !29)
113!29 = !{!30, !31}
114!30 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !28, file: !1, line: 3, baseType: !9, size: 32)
115!31 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !28, file: !1, line: 3, baseType: !9, size: 32)
116!32 = !{!33}
117!33 = !DILocalVariable(name: "arg", arg: 1, scope: !15, file: !1, line: 10, type: !18)
118!34 = !DILocation(line: 0, scope: !15)
119!35 = !DILocation(line: 11, column: 20, scope: !15)
120!36 = !DILocation(line: 11, column: 10, scope: !15)
121!37 = !DILocation(line: 11, column: 3, scope: !15)
122