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Vikram TV859ad292015-12-16 11:09:48 +00001; 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:
Vikram TV859ad292015-12-16 11:09:48 +000033; CHECK-NEXT: #DEBUG_VALUE: main:n <- %EBX
Reid Klecknerf6f04f82016-03-25 17:54:46 +000034; Other register values have been clobbered.
35; CHECK-NOT: #DEBUG_VALUE:
36; CHECK: movl %ecx, m(%rip)
Vikram TV859ad292015-12-16 11:09:48 +000037
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
Adrian Prantl75819ae2016-04-15 15:57:41 +0000107!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)
Vikram TV859ad292015-12-16 11:09:48 +0000108!1 = !DIFile(filename: "LiveDebugValues.c", directory: "/home/vt/julia/test/tvvikram")
109!2 = !{}
Adrian Prantl75819ae2016-04-15 15:57:41 +0000110!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)
Vikram TV859ad292015-12-16 11:09:48 +0000111!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)