offset-reloc-fieldinfo-1.ll
10.4 KB
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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
; RUN: opt -O2 %s | llvm-dis > %t1
; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK64 %s
; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK32 %s
; Source code:
; struct s {
; int a;
; int b1:9;
; int b2:4;
; };
; enum {
; FIELD_BYTE_OFFSET = 0,
; FIELD_BYTE_SIZE,
; FIELD_EXISTENCE,
; FIELD_SIGNEDNESS,
; FIELD_LSHIFT_U64,
; FIELD_RSHIFT_U64,
; };
; void bpf_probe_read(void *, unsigned, const void *);
; int field_read(struct s *arg) {
; unsigned long long ull;
; unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET);
; unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE);
; unsigned lshift;
;
; bpf_probe_read(&ull, size, (const void *)arg + offset);
; lshift = __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64);
; #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
; lshift = lshift + (size << 3) - 64;
; #endif
; ull <<= lshift;
; if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS))
; return (long long)ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
; return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
; }
; Compilation flag:
; clang -target bpfel -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
target triple = "bpfel"
%struct.s = type { i32, i16 }
; Function Attrs: nounwind
define dso_local i32 @field_read(%struct.s* %arg) local_unnamed_addr #0 !dbg !20 {
entry:
%ull = alloca i64, align 8
call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !31, metadata !DIExpression()), !dbg !37
%0 = bitcast i64* %ull to i8*, !dbg !38
call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #5, !dbg !38
%1 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s* %arg, i32 1, i32 2), !dbg !39, !llvm.preserve.access.index !25
%2 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 0), !dbg !40
call void @llvm.dbg.value(metadata i32 %2, metadata !34, metadata !DIExpression()), !dbg !37
%3 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 1), !dbg !41
call void @llvm.dbg.value(metadata i32 %3, metadata !35, metadata !DIExpression()), !dbg !37
%4 = bitcast %struct.s* %arg to i8*, !dbg !42
%idx.ext = zext i32 %2 to i64, !dbg !43
%add.ptr = getelementptr i8, i8* %4, i64 %idx.ext, !dbg !43
call void @bpf_probe_read(i8* nonnull %0, i32 %3, i8* %add.ptr) #5, !dbg !44
%5 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 4), !dbg !45
call void @llvm.dbg.value(metadata i32 %5, metadata !36, metadata !DIExpression()), !dbg !37
%6 = load i64, i64* %ull, align 8, !dbg !46, !tbaa !47
call void @llvm.dbg.value(metadata i64 %6, metadata !32, metadata !DIExpression()), !dbg !37
%sh_prom = zext i32 %5 to i64, !dbg !46
%shl = shl i64 %6, %sh_prom, !dbg !46
call void @llvm.dbg.value(metadata i64 %shl, metadata !32, metadata !DIExpression()), !dbg !37
%7 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 3), !dbg !51
%tobool = icmp eq i32 %7, 0, !dbg !51
%8 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 5), !dbg !37
%sh_prom1 = zext i32 %8 to i64, !dbg !37
%shr = ashr i64 %shl, %sh_prom1, !dbg !53
%shr3 = lshr i64 %shl, %sh_prom1, !dbg !53
%retval.0.in = select i1 %tobool, i64 %shr3, i64 %shr, !dbg !53
%retval.0 = trunc i64 %retval.0.in to i32, !dbg !37
call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %0) #5, !dbg !54
ret i32 %retval.0, !dbg !54
}
; CHECK: r{{[0-9]+}} = 4
; CHECK: r{{[0-9]+}} = 4
; CHECK: r{{[0-9]+}} <<= 51
; CHECK64: r{{[0-9]+}} s>>= 60
; CHECK64: r{{[0-9]+}} >>= 60
; CHECK32: r{{[0-9]+}} >>= 60
; CHECK32: r{{[0-9]+}} s>>= 60
; CHECK: r{{[0-9]+}} = 1
; CHECK: .byte 115 # string offset=1
; CHECK: .ascii ".text" # string offset=30
; CHECK: .ascii "0:2" # string offset=73
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 30 # Field reloc section string offset=30
; CHECK-NEXT: .long 6
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 0
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 4
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 5
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 73
; CHECK-NEXT: .long 3
; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
; Function Attrs: nounwind readnone
declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s*, i32, i32) #2
; Function Attrs: nounwind readnone
declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #2
declare dso_local void @bpf_probe_read(i8*, i32, i8*) local_unnamed_addr #3
; Function Attrs: argmemonly nounwind willreturn
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #4
attributes #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" }
attributes #1 = { argmemonly nounwind willreturn }
attributes #2 = { nounwind readnone }
attributes #3 = { "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" }
attributes #4 = { nounwind readnone speculatable willreturn }
attributes #5 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!16, !17, !18}
!llvm.ident = !{!19}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !12, 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: 6, baseType: !4, size: 32, elements: !5)
!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
!5 = !{!6, !7, !8, !9, !10, !11}
!6 = !DIEnumerator(name: "FIELD_BYTE_OFFSET", value: 0, isUnsigned: true)
!7 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true)
!8 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true)
!9 = !DIEnumerator(name: "FIELD_SIGNEDNESS", value: 3, isUnsigned: true)
!10 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true)
!11 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true)
!12 = !{!13, !15}
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null)
!15 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
!16 = !{i32 2, !"Dwarf Version", i32 4}
!17 = !{i32 2, !"Debug Info Version", i32 3}
!18 = !{i32 1, !"wchar_size", i32 4}
!19 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)"}
!20 = distinct !DISubprogram(name: "field_read", scope: !1, file: !1, line: 15, type: !21, scopeLine: 15, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !30)
!21 = !DISubroutineType(types: !22)
!22 = !{!23, !24}
!23 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !25, size: 64)
!25 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !26)
!26 = !{!27, !28, !29}
!27 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !25, file: !1, line: 2, baseType: !23, size: 32)
!28 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !25, file: !1, line: 3, baseType: !23, size: 9, offset: 32, flags: DIFlagBitField, extraData: i64 32)
!29 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !25, file: !1, line: 4, baseType: !23, size: 4, offset: 41, flags: DIFlagBitField, extraData: i64 32)
!30 = !{!31, !32, !34, !35, !36}
!31 = !DILocalVariable(name: "arg", arg: 1, scope: !20, file: !1, line: 15, type: !24)
!32 = !DILocalVariable(name: "ull", scope: !20, file: !1, line: 16, type: !33)
!33 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
!34 = !DILocalVariable(name: "offset", scope: !20, file: !1, line: 17, type: !4)
!35 = !DILocalVariable(name: "size", scope: !20, file: !1, line: 18, type: !4)
!36 = !DILocalVariable(name: "lshift", scope: !20, file: !1, line: 19, type: !4)
!37 = !DILocation(line: 0, scope: !20)
!38 = !DILocation(line: 16, column: 3, scope: !20)
!39 = !DILocation(line: 17, column: 56, scope: !20)
!40 = !DILocation(line: 17, column: 21, scope: !20)
!41 = !DILocation(line: 18, column: 19, scope: !20)
!42 = !DILocation(line: 21, column: 30, scope: !20)
!43 = !DILocation(line: 21, column: 48, scope: !20)
!44 = !DILocation(line: 21, column: 3, scope: !20)
!45 = !DILocation(line: 22, column: 12, scope: !20)
!46 = !DILocation(line: 26, column: 7, scope: !20)
!47 = !{!48, !48, i64 0}
!48 = !{!"long long", !49, i64 0}
!49 = !{!"omnipotent char", !50, i64 0}
!50 = !{!"Simple C/C++ TBAA"}
!51 = !DILocation(line: 27, column: 7, scope: !52)
!52 = distinct !DILexicalBlock(scope: !20, file: !1, line: 27, column: 7)
!53 = !DILocation(line: 27, column: 7, scope: !20)
!54 = !DILocation(line: 30, column: 1, scope: !20)