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
| ; RUN: opt -instcombine < %s -S | FileCheck %s
; This tests dbg.declare lowering for CallInst users of an alloca. The
; resulting dbg.value expressions should add a deref to the declare's expression.
; Hand-reduced from this example (-g -Og -mllvm -disable-llvm-optzns -gno-column-info):
; static volatile int sink;
; static void escape(int &c) { sink = c; }
; static bool empty ( int p1 ) { return p1 == 0; }
; int main() {
; int d1 = 42;
; while (!empty(d1))
; escape(d1);
; return 0;
; }
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@_ZL4sink = internal global i32 0, align 4, !dbg !0
; CHECK-LABEL: @main
define dso_local i32 @main() !dbg !12 {
entry:
%retval = alloca i32, align 4
%d1 = alloca i32, align 4
store i32 0, i32* %retval, align 4
%0 = bitcast i32* %d1 to i8*, !dbg !17
call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !17
; CHECK: dbg.value(metadata i32 42, metadata [[METADATA_IDX1:![0-9]+]], metadata !DIExpression())
; CHECK-NEXT: store
call void @llvm.dbg.declare(metadata i32* %d1, metadata !16, metadata !DIExpression()), !dbg !17
store i32 42, i32* %d1, align 4, !dbg !17
br label %while.cond, !dbg !22
while.cond: ; preds = %while.body, %entry
; CHECK: dbg.value(metadata i32 %1, metadata [[METADATA_IDX1]], metadata !DIExpression())
; CHECK-NEXT: call zeroext i1 @_ZL5emptyi
%1 = load i32, i32* %d1, align 4, !dbg !22
%call = call zeroext i1 @_ZL5emptyi(i32 %1), !dbg !22
%lnot = xor i1 %call, true, !dbg !22
br i1 %lnot, label %while.body, label %while.end, !dbg !22
while.body: ; preds = %while.cond
; CHECK: dbg.value(metadata i32* %d1, metadata [[METADATA_IDX1]], metadata !DIExpression(DW_OP_deref))
; CHECK-NEXT: call void @_ZL6escapeRi
call void @_ZL6escapeRi(i32* dereferenceable(4) %d1), !dbg !23
br label %while.cond, !dbg !22, !llvm.loop !24
while.end: ; preds = %while.cond
%2 = bitcast i32* %d1 to i8*, !dbg !25
call void @llvm.lifetime.end.p0i8(i64 4, i8* %2) #4, !dbg !25
ret i32 0, !dbg !26
}
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
declare void @llvm.dbg.declare(metadata, metadata, metadata)
define internal zeroext i1 @_ZL5emptyi(i32 %p1) !dbg !27 {
ret i1 false
}
define internal void @_ZL6escapeRi(i32* dereferenceable(4) %c) #3 !dbg !34 {
ret void
}
declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!8, !9, !10}
!llvm.ident = !{!11}
; CHECK: DIGlobalVariableExpression
; CHECK: [[METADATA_IDX1]] = !DILocalVariable(name: "d1"
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "sink", linkageName: "_ZL4sink", scope: !2, file: !3, line: 2, type: !6, isLocal: true, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
!3 = !DIFile(filename: "lower-dbg-declare.cpp", directory: "")
!4 = !{}
!5 = !{!0}
!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!8 = !{i32 2, !"Dwarf Version", i32 4}
!9 = !{i32 2, !"Debug Info Version", i32 3}
!10 = !{i32 1, !"wchar_size", i32 4}
!11 = !{!"clang"}
!12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
!13 = !DISubroutineType(types: !14)
!14 = !{!7}
!15 = !{!16}
!16 = !DILocalVariable(name: "d1", scope: !12, file: !3, line: 6, type: !7)
!17 = !DILocation(line: 6, scope: !12)
!22 = !DILocation(line: 7, scope: !12)
!23 = !DILocation(line: 8, scope: !12)
!24 = distinct !{!24, !22, !23}
!25 = !DILocation(line: 10, scope: !12)
!26 = !DILocation(line: 9, scope: !12)
!27 = distinct !DISubprogram(name: "empty", linkageName: "_ZL5emptyi", scope: !3, file: !3, line: 4, type: !28, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !31)
!28 = !DISubroutineType(types: !29)
!29 = !{!30, !7}
!30 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
!31 = !{!32}
!32 = !DILocalVariable(name: "p1", arg: 1, scope: !27, file: !3, line: 4, type: !7)
!33 = !DILocation(line: 4, scope: !27)
!34 = distinct !DISubprogram(name: "escape", linkageName: "_ZL6escapeRi", scope: !3, file: !3, line: 3, type: !35, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
!35 = !DISubroutineType(types: !36)
!36 = !{null, !37}
!37 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !7, size: 64)
!38 = !{!39}
!39 = !DILocalVariable(name: "c", arg: 1, scope: !34, file: !3, line: 3, type: !37)
!42 = !DILocation(line: 3, scope: !34)
|