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1; RUN: opt -adce -S < %s | FileCheck %s
2; Test that debug info intrinsics in dead scopes get eliminated by -adce.
3
4; Generated with 'clang -g -S -emit-llvm | opt -mem2reg -inline' at r262899
5; (before -adce was augmented) and then hand-reduced.  This was the input:
6;
7;;void sink(void);
8;;
9;;void variable_in_unused_subscope(void) {
10;;  { int i = 0; }
11;;  sink();
12;;}
13;;
14;;void variable_in_parent_scope(void) {
15;;  int i = 0;
16;;  { sink(); }
17;;}
18;;
19;;static int empty_function_with_unused_variable(void) {
20;;  { int i = 0; }
21;;  return 0;
22;;}
23;;
24;;void calls_empty_function_with_unused_variable_in_unused_subscope(void) {
25;;  { empty_function_with_unused_variable(); }
26;;  sink();
27;;}
28
29declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
30
31declare void @sink()
32
33; CHECK-LABEL: define void @variable_in_unused_subscope(
34define void @variable_in_unused_subscope() !dbg !4 {
35; CHECK-NEXT: entry:
36; CHECK-NEXT:   call void @sink
37; CHECK-NEXT:   ret void
38entry:
39  call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !15, metadata !17), !dbg !18
40  call void @sink(), !dbg !19
41  ret void, !dbg !20
42}
43
44; CHECK-LABEL: define void @variable_in_parent_scope(
45define void @variable_in_parent_scope() !dbg !7 {
46; CHECK-NEXT: entry:
47; CHECK-NEXT:   call void @llvm.dbg.value
48; CHECK-NEXT:   call void @sink
49; CHECK-NEXT:   ret void
50entry:
51  call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !21, metadata !17), !dbg !22
52  call void @sink(), !dbg !23
53  ret void, !dbg !25
54}
55
56; CHECK-LABEL: define void @calls_empty_function_with_unused_variable_in_unused_subscope(
57define void @calls_empty_function_with_unused_variable_in_unused_subscope() !dbg !8 {
58; CHECK-NEXT: entry:
59; CHECK-NEXT:   call void @sink
60; CHECK-NEXT:   ret void
61entry:
62  call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !26, metadata !17), !dbg !28
63  call void @sink(), !dbg !31
64  ret void, !dbg !32
65}
66
67!llvm.dbg.cu = !{!0}
68!llvm.module.flags = !{!14}
69
70!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
71!1 = !DIFile(filename: "t.c", directory: "/path/to/test/Transforms/ADCE")
72!2 = !{}
73!4 = distinct !DISubprogram(name: "variable_in_unused_subscope", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
74!5 = !DISubroutineType(types: !6)
75!6 = !{null}
76!7 = distinct !DISubprogram(name: "variable_in_parent_scope", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
77!8 = distinct !DISubprogram(name: "calls_empty_function_with_unused_variable_in_unused_subscope", scope: !1, file: !1, line: 18, type: !5, isLocal: false, isDefinition: true, scopeLine: 18, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
78!10 = distinct !DISubprogram(name: "empty_function_with_unused_variable", scope: !1, file: !1, line: 13, type: !11, isLocal: true, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
79!11 = !DISubroutineType(types: !12)
80!12 = !{!13}
81!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
82!14 = !{i32 2, !"Debug Info Version", i32 3}
83!15 = !DILocalVariable(name: "i", scope: !16, file: !1, line: 4, type: !13)
84!16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 4, column: 3)
85!17 = !DIExpression()
86!18 = !DILocation(line: 4, column: 9, scope: !16)
87!19 = !DILocation(line: 5, column: 3, scope: !4)
88!20 = !DILocation(line: 6, column: 1, scope: !4)
89!21 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 9, type: !13)
90!22 = !DILocation(line: 9, column: 7, scope: !7)
91!23 = !DILocation(line: 10, column: 5, scope: !24)
92!24 = distinct !DILexicalBlock(scope: !7, file: !1, line: 10, column: 3)
93!25 = !DILocation(line: 11, column: 1, scope: !7)
94!26 = !DILocalVariable(name: "i", scope: !27, file: !1, line: 14, type: !13)
95!27 = distinct !DILexicalBlock(scope: !10, file: !1, line: 14, column: 3)
96!28 = !DILocation(line: 14, column: 9, scope: !27, inlinedAt: !29)
97!29 = distinct !DILocation(line: 19, column: 5, scope: !30)
98!30 = distinct !DILexicalBlock(scope: !8, file: !1, line: 19, column: 3)
99!31 = !DILocation(line: 20, column: 3, scope: !8)
100!32 = !DILocation(line: 21, column: 1, scope: !8)
101