xref: /llvm-project/llvm/test/DebugInfo/X86/live-debug-values.ll (revision cbdccb30c23f71f20d05b19256232419e7c5e517) 
1; RUN: llc -filetype=asm %s -o - -experimental-debug-variable-locations=false | FileCheck %s
2; RUN: llc -filetype=asm %s -o - -experimental-debug-variable-locations=true | FileCheck %s --check-prefixes=CHECK,INSTRREF
3
4; Test the extension of debug ranges from predecessors.
5; Generated from the source file LiveDebugValues.c:
6; #include <stdio.h>
7; int m;
8; extern int inc(int n);
9; extern int change(int n);
10; extern int modify(int n);
11; int main(int argc, char **argv) {
12;   int n;
13;   if (argc != 2)
14;     n = 2;
15;   else
16;     n = atoi(argv[1]);
17;   n = change(n);
18;   if (n > 10) {
19;     m = modify(n);
20;     m = m + n;  // var `m' doesn't has a dbg.value
21;   }
22;   else
23;     m = inc(n); // var `m' doesn't has a dbg.value
24;   printf("m(main): %d\n", m);
25;   return 0;
26; }
27; with clang -g -O3 -emit-llvm -c LiveDebugValues.c -S -o live-debug-values.ll
28; This case will also produce multiple locations but only the debug range
29; extension is tested here.
30
31; XFAIL: *
32; This test is failing after splitting the live range of variable "n" in %bb.3.
33
34; DBG_VALUE for variable "n" is extended into %bb.5 from its predecessors %bb.3
35; and %bb.4.
36; CHECK:         .LBB0_5:
37; INSTRREF-NEXT: #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
38; INSTRREF-NEXT: #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
39; CHECK-NEXT:    #DEBUG_VALUE: main:n <- $ebx
40;   Other register values have been clobbered.
41; CHECK-NOT:   #DEBUG_VALUE:
42; CHECK:         movl    %e{{..}}, m(%rip)
43
44; ModuleID = 'LiveDebugValues.c'
45source_filename = "test/DebugInfo/X86/live-debug-values.ll"
46target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
47target triple = "x86_64-unknown-linux-gnu"
48
49@m = common dso_local global i32 0, align 4, !dbg !0
50@.str = private unnamed_addr constant [13 x i8] c"m(main): %d\0A\00", align 1
51
52; Function Attrs: nounwind uwtable
53define dso_local i32 @main(i32 %argc, ptr nocapture readonly %argv) #0 !dbg !10 {
54entry:
55  tail call void @llvm.dbg.value(metadata i32 %argc, metadata !17, metadata !20), !dbg !21
56  tail call void @llvm.dbg.value(metadata ptr %argv, metadata !18, metadata !20), !dbg !22
57  %cmp = icmp eq i32 %argc, 2, !dbg !24
58  br i1 %cmp, label %if.else, label %if.end, !dbg !26
59
60if.else:                                          ; preds = %entry
61  %arrayidx = getelementptr inbounds ptr, ptr %argv, i64 1, !dbg !27
62  %0 = load ptr, ptr %arrayidx, align 8, !dbg !27, !tbaa !28
63  %call = tail call i32 (ptr, ...) @atoi(ptr %0) #1, !dbg !32
64  tail call void @llvm.dbg.value(metadata i32 %call, metadata !19, metadata !20), !dbg !33
65  br label %if.end
66
67if.end:                                           ; preds = %if.else, %entry
68  %n.0 = phi i32 [ %call, %if.else ], [ 2, %entry ]
69  %call1 = tail call i32 @change(i32 %n.0) #1, !dbg !34
70  tail call void @llvm.dbg.value(metadata i32 %call1, metadata !19, metadata !20), !dbg !33
71  %cmp2 = icmp sgt i32 %call1, 10, !dbg !35
72  br i1 %cmp2, label %if.then.3, label %if.else.5, !dbg !37
73
74if.then.3:                                        ; preds = %if.end
75  %call4 = tail call i32 @modify(i32 %call1) #1, !dbg !38
76  %add = add nsw i32 %call4, %call1, !dbg !40
77  br label %if.end.7, !dbg !41
78
79if.else.5:                                        ; preds = %if.end
80  %call6 = tail call i32 @inc(i32 %call1) #1, !dbg !42
81  br label %if.end.7
82
83if.end.7:                                         ; preds = %if.else.5, %if.then.3
84  %storemerge = phi i32 [ %call6, %if.else.5 ], [ %add, %if.then.3 ]
85  store i32 %storemerge, ptr @m, align 4, !dbg !43, !tbaa !44
86  %call8 = tail call i32 (ptr, ...) @printf(ptr nonnull @.str, i32 %storemerge) #1, !dbg !46
87  ret i32 0, !dbg !47
88}
89
90; Function Attrs: nounwind
91declare i32 @atoi(...) #1
92
93; Function Attrs: nounwind
94declare i32 @change(i32) #1
95
96; Function Attrs: nounwind
97declare i32 @modify(i32) #1
98
99; Function Attrs: nounwind
100declare i32 @inc(i32) #1
101
102; Function Attrs: nounwind
103declare i32 @printf(ptr nocapture readonly, ...) #1
104
105; Function Attrs: nounwind readnone
106declare void @llvm.dbg.value(metadata, metadata, metadata) #2
107
108attributes #0 = { nounwind uwtable }
109attributes #1 = { nounwind }
110attributes #2 = { nounwind readnone }
111
112!llvm.dbg.cu = !{!2}
113!llvm.module.flags = !{!7, !8}
114!llvm.ident = !{!9}
115
116!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
117!1 = !DIGlobalVariable(name: "m", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
118!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.8.0 (trunk 253049) ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
119!3 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
120!4 = !{}
121!5 = !{!0}
122!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
123!7 = !{i32 2, !"Dwarf Version", i32 4}
124!8 = !{i32 2, !"Debug Info Version", i32 3}
125!9 = !{!"clang version 3.8.0 (trunk 253049) "}
126!10 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 6, type: !11, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !16)
127!11 = !DISubroutineType(types: !12)
128!12 = !{!6, !6, !13}
129!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64, align: 64)
130!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64, align: 64)
131!15 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
132!16 = !{!17, !18, !19}
133!17 = !DILocalVariable(name: "argc", arg: 1, scope: !10, file: !3, line: 6, type: !6)
134!18 = !DILocalVariable(name: "argv", arg: 2, scope: !10, file: !3, line: 6, type: !13)
135!19 = !DILocalVariable(name: "n", scope: !10, file: !3, line: 7, type: !6)
136!20 = !DIExpression()
137!21 = !DILocation(line: 6, column: 14, scope: !10)
138!22 = !DILocation(line: 6, column: 27, scope: !23)
139!23 = !DILexicalBlockFile(scope: !10, file: !3, discriminator: 1)
140!24 = !DILocation(line: 8, column: 12, scope: !25)
141!25 = distinct !DILexicalBlock(scope: !10, file: !3, line: 8, column: 7)
142!26 = !DILocation(line: 8, column: 7, scope: !10)
143!27 = !DILocation(line: 11, column: 14, scope: !25)
144!28 = !{!29, !29, i64 0}
145!29 = !{!"any pointer", !30, i64 0}
146!30 = !{!"omnipotent char", !31, i64 0}
147!31 = !{!"Simple C/C++ TBAA"}
148!32 = !DILocation(line: 11, column: 9, scope: !25)
149!33 = !DILocation(line: 7, column: 7, scope: !23)
150!34 = !DILocation(line: 12, column: 7, scope: !10)
151!35 = !DILocation(line: 13, column: 9, scope: !36)
152!36 = distinct !DILexicalBlock(scope: !10, file: !3, line: 13, column: 7)
153!37 = !DILocation(line: 13, column: 7, scope: !10)
154!38 = !DILocation(line: 14, column: 9, scope: !39)
155!39 = distinct !DILexicalBlock(scope: !36, file: !3, line: 13, column: 15)
156!40 = !DILocation(line: 15, column: 11, scope: !39)
157!41 = !DILocation(line: 16, column: 3, scope: !39)
158!42 = !DILocation(line: 18, column: 9, scope: !36)
159!43 = !DILocation(line: 15, column: 7, scope: !39)
160!44 = !{!45, !45, i64 0}
161!45 = !{!"int", !30, i64 0}
162!46 = !DILocation(line: 19, column: 3, scope: !10)
163!47 = !DILocation(line: 20, column: 3, scope: !10)
164
165