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