1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
; RUN: opt -O2 %s | llvm-dis > %t1
; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU64 %s
; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU32 %s
; Source code:
; typedef struct s1 { char a1 [5][5]; } __s1;
; union u1 { int b1; __s1 b2; };
; enum { FIELD_RSHIFT_U64 = 5, };
; int test(union u1 *arg) {
; unsigned r1 = __builtin_preserve_field_info(arg->b2.a1[3], FIELD_RSHIFT_U64);
; unsigned r2 = __builtin_preserve_field_info(arg->b2.a1[3][3], FIELD_RSHIFT_U64);
; /* r1 : 24, r2 : 56 */
; return r1 + r2;
; }
; Compilation flag:
; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
target triple = "bpf"
%union.u1 = type { i32, [24 x i8] }
%struct.s1 = type { [5 x [5 x i8]] }
; Function Attrs: nounwind readnone
define dso_local i32 @test(%union.u1* %arg) local_unnamed_addr #0 !dbg !18 {
entry:
call void @llvm.dbg.value(metadata %union.u1* %arg, metadata !32, metadata !DIExpression()), !dbg !35
%0 = tail call %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1* %arg, i32 1), !dbg !36, !llvm.preserve.access.index !23
%b2 = bitcast %union.u1* %0 to %struct.s1*, !dbg !36
%1 = tail call [5 x [5 x i8]]* @llvm.preserve.struct.access.index.p0a5a5i8.p0s_struct.s1s(%struct.s1* elementtype(%struct.s1) %b2, i32 0, i32 0), !dbg !37, !llvm.preserve.access.index !28
%2 = tail call [5 x i8]* @llvm.preserve.array.access.index.p0a5i8.p0a5a5i8([5 x [5 x i8]]* elementtype([5 x [5 x i8]]) %1, i32 1, i32 3), !dbg !38, !llvm.preserve.access.index !8
%3 = tail call i32 @llvm.bpf.preserve.field.info.p0a5i8([5 x i8]* %2, i64 5), !dbg !39
call void @llvm.dbg.value(metadata i32 %3, metadata !33, metadata !DIExpression()), !dbg !35
%4 = tail call i8* @llvm.preserve.array.access.index.p0i8.p0a5i8([5 x i8]* elementtype([5 x i8]) %2, i32 1, i32 3), !dbg !40, !llvm.preserve.access.index !12
%5 = tail call i32 @llvm.bpf.preserve.field.info.p0i8(i8* %4, i64 5), !dbg !41
call void @llvm.dbg.value(metadata i32 %5, metadata !34, metadata !DIExpression()), !dbg !35
%add = add i32 %5, %3, !dbg !42
ret i32 %add, !dbg !43
}
; CHECK: r1 = 24
; CHECK: r0 = 56
; CHECK-ALU64: r0 += r1
; CHECK-ALU32: w0 += w1
; CHECK: exit
; CHECK: .long 1 # BTF_KIND_UNION(id = 2)
; CHECK: .ascii "u1" # string offset=1
; CHECK: .ascii ".text" # string offset=59
; CHECK: .ascii "0:1:0:3" # string offset=65
; CHECK: .ascii "0:1:0:3:3" # string offset=110
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 59 # Field reloc section string offset=59
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 65
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 110
; CHECK-NEXT: .long 5
; Function Attrs: nounwind readnone
declare %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1*, i32) #1
; Function Attrs: nounwind readnone
declare [5 x [5 x i8]]* @llvm.preserve.struct.access.index.p0a5a5i8.p0s_struct.s1s(%struct.s1*, i32, i32) #1
; Function Attrs: nounwind readnone
declare [5 x i8]* @llvm.preserve.array.access.index.p0a5i8.p0a5a5i8([5 x [5 x i8]]*, i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.bpf.preserve.field.info.p0a5i8([5 x i8]*, i64) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.preserve.array.access.index.p0i8.p0a5i8([5 x i8]*, i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.bpf.preserve.field.info.p0i8(i8*, i64) #1
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind readnone "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" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind readnone speculatable willreturn }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!14, !15, !16}
!llvm.ident = !{!17}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git c1e02f16f1105ffaf1c35ee8bc38b7d6db5c6ea9)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !7, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
!2 = !{!3}
!3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 3, baseType: !4, size: 32, elements: !5)
!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
!5 = !{!6}
!6 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true)
!7 = !{!8, !12}
!8 = !DICompositeType(tag: DW_TAG_array_type, baseType: !9, size: 200, elements: !10)
!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!10 = !{!11, !11}
!11 = !DISubrange(count: 5)
!12 = !DICompositeType(tag: DW_TAG_array_type, baseType: !9, size: 40, elements: !13)
!13 = !{!11}
!14 = !{i32 2, !"Dwarf Version", i32 4}
!15 = !{i32 2, !"Debug Info Version", i32 3}
!16 = !{i32 1, !"wchar_size", i32 4}
!17 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git c1e02f16f1105ffaf1c35ee8bc38b7d6db5c6ea9)"}
!18 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !19, scopeLine: 4, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !31)
!19 = !DISubroutineType(types: !20)
!20 = !{!21, !22}
!21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !23, size: 64)
!23 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u1", file: !1, line: 2, size: 224, elements: !24)
!24 = !{!25, !26}
!25 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !23, file: !1, line: 2, baseType: !21, size: 32)
!26 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !23, file: !1, line: 2, baseType: !27, size: 200)
!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "__s1", file: !1, line: 1, baseType: !28)
!28 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 1, size: 200, elements: !29)
!29 = !{!30}
!30 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !28, file: !1, line: 1, baseType: !8, size: 200)
!31 = !{!32, !33, !34}
!32 = !DILocalVariable(name: "arg", arg: 1, scope: !18, file: !1, line: 4, type: !22)
!33 = !DILocalVariable(name: "r1", scope: !18, file: !1, line: 5, type: !4)
!34 = !DILocalVariable(name: "r2", scope: !18, file: !1, line: 6, type: !4)
!35 = !DILocation(line: 0, scope: !18)
!36 = !DILocation(line: 5, column: 52, scope: !18)
!37 = !DILocation(line: 5, column: 55, scope: !18)
!38 = !DILocation(line: 5, column: 47, scope: !18)
!39 = !DILocation(line: 5, column: 17, scope: !18)
!40 = !DILocation(line: 6, column: 47, scope: !18)
!41 = !DILocation(line: 6, column: 17, scope: !18)
!42 = !DILocation(line: 8, column: 13, scope: !18)
!43 = !DILocation(line: 8, column: 3, scope: !18)
|
