1; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s 2 3; Build from the following source with clang -O2. 4 5; The important details are that 'x's abstract definition is first built during 6; the definition of 'b', where the parameter to 'x' is constant and so 'x's 's' 7; variable is optimized away. No abstract definition DIE for 's' is constructed. 8; Then, during 'a' emission, the abstract DbgVariable for 's' is created, but 9; the abstract DIE isn't (since the abstract definition for 'b' is already 10; built). This results in 's' inlined in 'a' being emitted with its name, line, 11; file there, rather than referencing an abstract definition. 12 13; extern int t; 14; 15; void f(int); 16; 17; inline void x(bool b) { 18; if (b) { 19; int s = t; 20; f(s); 21; } 22; f(0); 23; } 24; 25; void b() { 26; x(false); 27; } 28; 29; void a(bool u) { 30; x(u); 31; } 32 33; CHECK: [[X_DECL:.*]]: DW_TAG_subprogram 34; CHECK-NOT: DW_TAG 35; CHECK: DW_AT_name {{.*}} "x" 36; CHECK-NOT: {{DW_TAG|NULL}} 37; CHECK: DW_TAG_formal_parameter 38; CHECK-NOT: DW_TAG 39; CHECK: DW_AT_name {{.*}} "b" 40; CHECK-NOT: {{DW_TAG|NULL}} 41; CHECK: DW_TAG_lexical_block 42; CHECK-NOT: {{DW_TAG|NULL}} 43; CHECK: DW_TAG_variable 44; CHECK-NOT: DW_TAG 45; CHECK: DW_AT_name {{.*}} "s" 46 47; CHECK: DW_TAG_subprogram 48; CHECK-NOT: DW_TAG 49; CHECK: DW_AT_name {{.*}} "b" 50; CHECK-NOT: {{DW_TAG|NULL}} 51; CHECK: DW_TAG_inlined_subroutine 52; CHECK-NOT: DW_TAG 53; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]} 54; CHECK-NOT: {{DW_TAG|NULL}} 55; CHECK: DW_TAG_formal_parameter 56; CHECK-NOT: DW_TAG 57; CHECK: DW_AT_abstract_origin {{.*}} "b" 58; Notice 'x's local variable 's' is missing. Not necessarily a bug here, 59; since it's been optimized entirely away and it should be described in 60; abstract subprogram. 61; CHECK-NOT: DW_TAG 62; CHECK: NULL 63; CHECK-NOT: DW_TAG 64; CHECK: NULL 65 66; CHECK: DW_TAG_subprogram 67; CHECK-NOT: DW_TAG 68; CHECK: DW_AT_name {{.*}} "a" 69; CHECK-NOT: {{DW_TAG|NULL}} 70; CHECK: DW_TAG_formal_parameter 71; CHECK-NOT: {{DW_TAG|NULL}} 72; CHECK: DW_TAG_inlined_subroutine 73; CHECK-NOT: DW_TAG 74; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]} 75; CHECK-NOT: {{DW_TAG|NULL}} 76; FIXME: This formal parameter goes missing at least at -O2 (& on 77; mips/powerpc), maybe before that. Perhaps SelectionDAG is to blame (and 78; fastisel succeeds). 79; CHECK: DW_TAG_formal_parameter 80; CHECK-NOT: DW_TAG 81; CHECK: DW_AT_abstract_origin {{.*}} "b" 82 83; CHECK-NOT: {{DW_TAG|NULL}} 84; CHECK: DW_TAG_lexical_block 85; CHECK-NOT: {{DW_TAG|NULL}} 86; CHECK: DW_TAG_variable 87; CHECK-NOT: DW_TAG 88; CHECK: DW_AT_abstract_origin {{.*}} "s" 89 90@t = external global i32 91 92; Function Attrs: uwtable 93define void @_Z1bv() #0 !dbg !4 { 94entry: 95 tail call void @llvm.dbg.value(metadata i1 false, metadata !25, metadata !DIExpression()), !dbg !27 96 tail call void @_Z1fi(i32 0), !dbg !28 97 ret void, !dbg !29 98} 99 100; Function Attrs: uwtable 101define void @_Z1ab(i1 zeroext %u) #0 !dbg !8 { 102entry: 103 tail call void @llvm.dbg.value(metadata i1 %u, metadata !13, metadata !DIExpression()), !dbg !30 104 tail call void @llvm.dbg.value(metadata i1 %u, metadata !31, metadata !DIExpression()), !dbg !33 105 br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34 106 107if.then.i: ; preds = %entry 108 %0 = load i32, i32* @t, align 4, !dbg !35, !tbaa !36 109 tail call void @llvm.dbg.value(metadata i32 %0, metadata !40, metadata !DIExpression()), !dbg !35 110 tail call void @_Z1fi(i32 %0), !dbg !41 111 br label %_Z1xb.exit, !dbg !42 112 113_Z1xb.exit: ; preds = %entry, %if.then.i 114 tail call void @_Z1fi(i32 0), !dbg !43 115 ret void, !dbg !44 116} 117 118declare void @_Z1fi(i32) #1 119 120; Function Attrs: nounwind readnone 121declare void @llvm.dbg.value(metadata, metadata, metadata) #2 122 123attributes #0 = { uwtable "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 124attributes #1 = { "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 125attributes #2 = { nounwind readnone } 126 127!llvm.dbg.cu = !{!0} 128!llvm.module.flags = !{!21, !22} 129!llvm.ident = !{!23} 130 131!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2) 132!1 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 133!2 = !{} 134!4 = distinct !DISubprogram(name: "b", linkageName: "_Z1bv", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 13, file: !1, scope: !5, type: !6, retainedNodes: !2) 135!5 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 136!6 = !DISubroutineType(types: !7) 137!7 = !{null} 138!8 = distinct !DISubprogram(name: "a", linkageName: "_Z1ab", line: 17, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 17, file: !1, scope: !5, type: !9, retainedNodes: !12) 139!9 = !DISubroutineType(types: !10) 140!10 = !{null, !11} 141!11 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean) 142!12 = !{!13} 143!13 = !DILocalVariable(name: "u", line: 17, arg: 1, scope: !8, file: !5, type: !11) 144!14 = distinct !DISubprogram(name: "x", linkageName: "_Z1xb", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 5, file: !1, scope: !5, type: !9, retainedNodes: !15) 145!15 = !{!16, !17} 146!16 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 147!17 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 148!18 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !19) 149!19 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !14) 150!20 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 151!21 = !{i32 2, !"Dwarf Version", i32 4} 152!22 = !{i32 2, !"Debug Info Version", i32 3} 153!23 = !{!"clang version 3.5.0 "} 154!24 = !{i1 false} 155!25 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 156!26 = !DILocation(line: 14, scope: !4) 157!27 = !DILocation(line: 5, scope: !14, inlinedAt: !26) 158!28 = !DILocation(line: 10, scope: !14, inlinedAt: !26) 159!29 = !DILocation(line: 15, scope: !4) 160!30 = !DILocation(line: 17, scope: !8) 161!31 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 162!32 = !DILocation(line: 18, scope: !8) 163!33 = !DILocation(line: 5, scope: !14, inlinedAt: !32) 164!34 = !DILocation(line: 6, scope: !19, inlinedAt: !32) 165!35 = !DILocation(line: 7, scope: !18, inlinedAt: !32) 166!36 = !{!37, !37, i64 0} 167!37 = !{!"int", !38, i64 0} 168!38 = !{!"omnipotent char", !39, i64 0} 169!39 = !{!"Simple C/C++ TBAA"} 170!40 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 171!41 = !DILocation(line: 8, scope: !18, inlinedAt: !32) 172!42 = !DILocation(line: 9, scope: !18, inlinedAt: !32) 173!43 = !DILocation(line: 10, scope: !14, inlinedAt: !32) 174!44 = !DILocation(line: 19, scope: !8) 175