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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
| ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK,CHECK-ALU64 %s
; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK,CHECK-ALU64 %s
; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK,CHECK-ALU32 %s
; RUN: llc -march=bpfeb -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK,CHECK-ALU32 %s
; Source code:
; typedef struct s1 { int a1:7; int a2:4; int a3:5; int a4:16;} __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, FIELD_RSHIFT_U64);
; unsigned r2 = __builtin_preserve_field_info(arg->b2.a2, FIELD_RSHIFT_U64);
; unsigned r3 = __builtin_preserve_field_info(arg->b2.a3, FIELD_RSHIFT_U64);
; unsigned r4 = __builtin_preserve_field_info(arg->b2.a4, FIELD_RSHIFT_U64);
; /* r1: 57, r2: 60, r3: 59, r4: 48 */
; return r1 + r2 + r3 + r4;
; }
; Compilation flag:
; clang -target bpf -O2 -g -S -emit-llvm test.c
%union.u1 = type { i32 }
%struct.s1 = type { i32 }
; Function Attrs: nounwind readnone
define dso_local i32 @test(%union.u1* %arg) local_unnamed_addr #0 !dbg !11 {
entry:
call void @llvm.dbg.value(metadata %union.u1* %arg, metadata !28, metadata !DIExpression()), !dbg !33
%0 = tail call %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1* %arg, i32 1), !dbg !34, !llvm.preserve.access.index !16
%b2 = bitcast %union.u1* %0 to %struct.s1*, !dbg !34
%1 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %b2, i32 0, i32 0), !dbg !35, !llvm.preserve.access.index !21
%2 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %1, i64 5), !dbg !36
call void @llvm.dbg.value(metadata i32 %2, metadata !29, metadata !DIExpression()), !dbg !33
%3 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %b2, i32 0, i32 1), !dbg !37, !llvm.preserve.access.index !21
%4 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %3, i64 5), !dbg !38
call void @llvm.dbg.value(metadata i32 %4, metadata !30, metadata !DIExpression()), !dbg !33
%5 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %b2, i32 0, i32 2), !dbg !39, !llvm.preserve.access.index !21
%6 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %5, i64 5), !dbg !40
call void @llvm.dbg.value(metadata i32 %6, metadata !31, metadata !DIExpression()), !dbg !33
%7 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %b2, i32 0, i32 3), !dbg !41, !llvm.preserve.access.index !21
%8 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %7, i64 5), !dbg !42
call void @llvm.dbg.value(metadata i32 %8, metadata !32, metadata !DIExpression()), !dbg !33
%add = add i32 %4, %2, !dbg !43
%add4 = add i32 %add, %6, !dbg !44
%add5 = add i32 %add4, %8, !dbg !45
ret i32 %add5, !dbg !46
}
; CHECK: r1 = 57
; CHECK: r0 = 60
; CHECK-ALU64: r0 += r1
; CHECK-ALU32: w0 += w1
; CHECK: r1 = 59
; CHECK-ALU64: r0 += r1
; CHECK-ALU32: w0 += w1
; CHECK: r1 = 48
; 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=43
; CHECK: .ascii "0:1:0" # string offset=49
; CHECK: .ascii "0:1:1" # string offset=92
; CHECK: .ascii "0:1:2" # string offset=98
; CHECK: .ascii "0:1:3" # string offset=104
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 43 # Field reloc section string offset=43
; CHECK-NEXT: .long 4
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 49
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 92
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 98
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 104
; 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 i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1*, i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.bpf.preserve.field.info.p0i32(i32*, 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 = !{!7, !8, !9}
!llvm.ident = !{!10}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 4a60741b74384f14b21fdc0131ede326438840ab)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, 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 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 4a60741b74384f14b21fdc0131ede326438840ab)"}
!11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !12, scopeLine: 4, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !27)
!12 = !DISubroutineType(types: !13)
!13 = !{!14, !15}
!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
!16 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u1", file: !1, line: 2, size: 32, elements: !17)
!17 = !{!18, !19}
!18 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !16, file: !1, line: 2, baseType: !14, size: 32)
!19 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !16, file: !1, line: 2, baseType: !20, size: 32)
!20 = !DIDerivedType(tag: DW_TAG_typedef, name: "__s1", file: !1, line: 1, baseType: !21)
!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 1, size: 32, elements: !22)
!22 = !{!23, !24, !25, !26}
!23 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !21, file: !1, line: 1, baseType: !14, size: 7, flags: DIFlagBitField, extraData: i64 0)
!24 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !21, file: !1, line: 1, baseType: !14, size: 4, offset: 7, flags: DIFlagBitField, extraData: i64 0)
!25 = !DIDerivedType(tag: DW_TAG_member, name: "a3", scope: !21, file: !1, line: 1, baseType: !14, size: 5, offset: 11, flags: DIFlagBitField, extraData: i64 0)
!26 = !DIDerivedType(tag: DW_TAG_member, name: "a4", scope: !21, file: !1, line: 1, baseType: !14, size: 16, offset: 16, flags: DIFlagBitField, extraData: i64 0)
!27 = !{!28, !29, !30, !31, !32}
!28 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 4, type: !15)
!29 = !DILocalVariable(name: "r1", scope: !11, file: !1, line: 5, type: !4)
!30 = !DILocalVariable(name: "r2", scope: !11, file: !1, line: 6, type: !4)
!31 = !DILocalVariable(name: "r3", scope: !11, file: !1, line: 7, type: !4)
!32 = !DILocalVariable(name: "r4", scope: !11, file: !1, line: 8, type: !4)
!33 = !DILocation(line: 0, scope: !11)
!34 = !DILocation(line: 5, column: 52, scope: !11)
!35 = !DILocation(line: 5, column: 55, scope: !11)
!36 = !DILocation(line: 5, column: 17, scope: !11)
!37 = !DILocation(line: 6, column: 55, scope: !11)
!38 = !DILocation(line: 6, column: 17, scope: !11)
!39 = !DILocation(line: 7, column: 55, scope: !11)
!40 = !DILocation(line: 7, column: 17, scope: !11)
!41 = !DILocation(line: 8, column: 55, scope: !11)
!42 = !DILocation(line: 8, column: 17, scope: !11)
!43 = !DILocation(line: 10, column: 13, scope: !11)
!44 = !DILocation(line: 10, column: 18, scope: !11)
!45 = !DILocation(line: 10, column: 23, scope: !11)
!46 = !DILocation(line: 10, column: 3, scope: !11)
|