1; RUN: opt -passes=adce -S < %s | FileCheck %s 2; RUN: opt -passes=adce -S < %s --try-experimental-debuginfo-iterators | FileCheck %s 3; Test that debug info intrinsics in dead scopes get eliminated by -adce. 4 5; Generated with 'clang -g -S -emit-llvm | opt -passes=mem2reg -inline' at r262899 6; (before -passes=adce was augmented) and then hand-reduced. This was the input: 7; 8;;void sink(void); 9;; 10;;void variable_in_unused_subscope(void) { 11;; { int i = 0; } 12;; sink(); 13;;} 14;; 15;;void variable_in_parent_scope(void) { 16;; int i = 0; 17;; { sink(); } 18;;} 19;; 20;;static int empty_function_with_unused_variable(void) { 21;; { int i = 0; } 22;; return 0; 23;;} 24;; 25;;void calls_empty_function_with_unused_variable_in_unused_subscope(void) { 26;; { empty_function_with_unused_variable(); } 27;; sink(); 28;;} 29 30declare void @llvm.dbg.value(metadata, metadata, metadata) 31 32declare void @sink() 33 34; CHECK-LABEL: define void @variable_in_unused_subscope( 35define void @variable_in_unused_subscope() !dbg !4 { 36; CHECK-NEXT: entry: 37; CHECK-NEXT: call void @sink 38; CHECK-NEXT: ret void 39entry: 40 call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !17), !dbg !18 41 call void @sink(), !dbg !19 42 ret void, !dbg !20 43} 44 45; CHECK-LABEL: define void @variable_in_parent_scope( 46define void @variable_in_parent_scope() !dbg !7 { 47; CHECK-NEXT: entry: 48; CHECK-NEXT: #dbg_value 49; CHECK-NEXT: call void @sink 50; CHECK-NEXT: ret void 51entry: 52 call void @llvm.dbg.value(metadata i32 0, metadata !21, metadata !17), !dbg !22 53 call void @sink(), !dbg !23 54 ret void, !dbg !25 55} 56 57; CHECK-LABEL: define void @calls_empty_function_with_unused_variable_in_unused_subscope( 58define void @calls_empty_function_with_unused_variable_in_unused_subscope() !dbg !8 { 59; CHECK-NEXT: entry: 60; CHECK-NEXT: call void @sink 61; CHECK-NEXT: ret void 62entry: 63 call void @llvm.dbg.value(metadata i32 0, metadata !26, metadata !17), !dbg !28 64 call void @sink(), !dbg !31 65 ret void, !dbg !32 66} 67 68!llvm.dbg.cu = !{!0} 69!llvm.module.flags = !{!14} 70 71!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 72!1 = !DIFile(filename: "t.c", directory: "/path/to/test/Transforms/ADCE") 73!2 = !{} 74!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, retainedNodes: !2) 75!5 = !DISubroutineType(types: !6) 76!6 = !{null} 77!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, retainedNodes: !2) 78!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, retainedNodes: !2) 79!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, retainedNodes: !2) 80!11 = !DISubroutineType(types: !12) 81!12 = !{!13} 82!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 83!14 = !{i32 2, !"Debug Info Version", i32 3} 84!15 = !DILocalVariable(name: "i", scope: !16, file: !1, line: 4, type: !13) 85!16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 4, column: 3) 86!17 = !DIExpression() 87!18 = !DILocation(line: 4, column: 9, scope: !16) 88!19 = !DILocation(line: 5, column: 3, scope: !4) 89!20 = !DILocation(line: 6, column: 1, scope: !4) 90!21 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 9, type: !13) 91!22 = !DILocation(line: 9, column: 7, scope: !7) 92!23 = !DILocation(line: 10, column: 5, scope: !24) 93!24 = distinct !DILexicalBlock(scope: !7, file: !1, line: 10, column: 3) 94!25 = !DILocation(line: 11, column: 1, scope: !7) 95!26 = !DILocalVariable(name: "i", scope: !27, file: !1, line: 14, type: !13) 96!27 = distinct !DILexicalBlock(scope: !10, file: !1, line: 14, column: 3) 97!28 = !DILocation(line: 14, column: 9, scope: !27, inlinedAt: !29) 98!29 = distinct !DILocation(line: 19, column: 5, scope: !30) 99!30 = distinct !DILexicalBlock(scope: !8, file: !1, line: 19, column: 3) 100!31 = !DILocation(line: 20, column: 3, scope: !8) 101!32 = !DILocation(line: 21, column: 1, scope: !8) 102