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 29 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) 30 31 declare void @sink() 32 33 ; CHECK-LABEL: define void @variable_in_unused_subscope( 34 define void @variable_in_unused_subscope() !dbg !4 { 35 ; CHECK-NEXT: entry: 36 ; CHECK-NEXT: call void @sink 37 ; CHECK-NEXT: ret void 38 entry: 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( 45 define 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 50 entry: 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( 57 define 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 61 entry: 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
