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