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
| ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; RUN: llc -march=bpfeb -mattr=+alu32 -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; Source code:
; struct t1 {
; int c;
; };
; struct s1 {
; struct t1 b;
; };
; struct r1 {
; struct s1 a;
; };
; #define _(x) __builtin_preserve_access_index(x)
; void test1(void *p1, void *p2, void *p3);
; void test(struct r1 *arg) {
; struct s1 *ps = _(&arg->a);
; struct t1 *pt = _(&arg->a.b);
; int *pi = _(&arg->a.b.c);
; test1(ps, pt, pi);
; }
; Compilation flag:
; clang -target bpf -O2 -g -S -emit-llvm test.c
%struct.r1 = type { %struct.s1 }
%struct.s1 = type { %struct.t1 }
%struct.t1 = type { i32 }
; Function Attrs: nounwind
define dso_local void @test(%struct.r1* %arg) local_unnamed_addr #0 !dbg !7 {
entry:
call void @llvm.dbg.value(metadata %struct.r1* %arg, metadata !22, metadata !DIExpression()), !dbg !29
%0 = tail call %struct.s1* @llvm.preserve.struct.access.index.p0s_struct.s1s.p0s_struct.r1s(%struct.r1* %arg, i32 0, i32 0), !dbg !30, !llvm.preserve.access.index !11
call void @llvm.dbg.value(metadata %struct.s1* %0, metadata !23, metadata !DIExpression()), !dbg !29
%1 = tail call %struct.t1* @llvm.preserve.struct.access.index.p0s_struct.t1s.p0s_struct.s1s(%struct.s1* %0, i32 0, i32 0), !dbg !31, !llvm.preserve.access.index !14
call void @llvm.dbg.value(metadata %struct.t1* %1, metadata !25, metadata !DIExpression()), !dbg !29
%2 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.t1s(%struct.t1* %1, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !17
call void @llvm.dbg.value(metadata i32* %2, metadata !27, metadata !DIExpression()), !dbg !29
%3 = bitcast %struct.s1* %0 to i8*, !dbg !33
%4 = bitcast %struct.t1* %1 to i8*, !dbg !34
%5 = bitcast i32* %2 to i8*, !dbg !35
tail call void @test1(i8* %3, i8* %4, i8* %5) #4, !dbg !36
ret void, !dbg !37
}
; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2)
; CHECK: .ascii "r1" # string offset=1
; CHECK: .ascii ".text" # string offset=29
; CHECK: .ascii "0:0" # string offset=72
; CHECK: .ascii "0:0:0" # string offset=76
; CHECK: .ascii "0:0:0:0" # string offset=82
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 29 # Field reloc section string offset=29
; CHECK-NEXT: .long 3
; CHECK_NEXT: .long .Ltmp{{[0-9]+}}
; CHECK_NEXT: .long 2
; CHECK_NEXT: .long 72
; CHECK_NEXT: .long 0
; CHECK_NEXT: .long .Ltmp{{[0-9]+}}
; CHECK_NEXT: .long 2
; CHECK_NEXT: .long 76
; CHECK_NEXT: .long 0
; CHECK_NEXT: .long .Ltmp{{[0-9]+}}
; CHECK_NEXT: .long 2
; CHECK_NEXT: .long 82
; CHECK_NEXT: .long 0
; Function Attrs: nounwind readnone
declare %struct.s1* @llvm.preserve.struct.access.index.p0s_struct.s1s.p0s_struct.r1s(%struct.r1*, i32, i32) #1
; Function Attrs: nounwind readnone
declare %struct.t1* @llvm.preserve.struct.access.index.p0s_struct.t1s.p0s_struct.s1s(%struct.s1*, i32, i32) #1
; Function Attrs: nounwind readnone
declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.t1s(%struct.t1*, i32, i32) #1
declare dso_local void @test1(i8*, i8*, i8*) local_unnamed_addr #2
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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 = { nounwind readnone }
attributes #2 = { "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 #3 = { nounwind readnone speculatable willreturn }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 42b3328a2368b38fba6bdb0c616fe6c5520e3bc5)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 42b3328a2368b38fba6bdb0c616fe6c5520e3bc5)"}
!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 12, type: !8, scopeLine: 12, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !21)
!8 = !DISubroutineType(types: !9)
!9 = !{null, !10}
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "r1", file: !1, line: 7, size: 32, elements: !12)
!12 = !{!13}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !11, file: !1, line: 8, baseType: !14, size: 32)
!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 4, size: 32, elements: !15)
!15 = !{!16}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !14, file: !1, line: 5, baseType: !17, size: 32)
!17 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !1, line: 1, size: 32, elements: !18)
!18 = !{!19}
!19 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !17, file: !1, line: 2, baseType: !20, size: 32)
!20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!21 = !{!22, !23, !25, !27}
!22 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 12, type: !10)
!23 = !DILocalVariable(name: "ps", scope: !7, file: !1, line: 13, type: !24)
!24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!25 = !DILocalVariable(name: "pt", scope: !7, file: !1, line: 14, type: !26)
!26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64)
!27 = !DILocalVariable(name: "pi", scope: !7, file: !1, line: 15, type: !28)
!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)
!29 = !DILocation(line: 0, scope: !7)
!30 = !DILocation(line: 13, column: 19, scope: !7)
!31 = !DILocation(line: 14, column: 19, scope: !7)
!32 = !DILocation(line: 15, column: 13, scope: !7)
!33 = !DILocation(line: 16, column: 9, scope: !7)
!34 = !DILocation(line: 16, column: 13, scope: !7)
!35 = !DILocation(line: 16, column: 17, scope: !7)
!36 = !DILocation(line: 16, column: 3, scope: !7)
!37 = !DILocation(line: 17, column: 1, scope: !7)
|