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