1; RUN: %llc_dwarf -mtriple x86_64-gnu-linux -O0 -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck %s 2; RUN: %llc_dwarf --try-experimental-debuginfo-iterators -mtriple x86_64-gnu-linux -O0 -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck %s 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_location 82; CHECK: DW_AT_abstract_origin {{.*}} "b" 83 84; CHECK-NOT: {{DW_TAG|NULL}} 85; CHECK: DW_TAG_lexical_block 86; CHECK-NOT: {{DW_TAG|NULL}} 87; CHECK: DW_TAG_variable 88; CHECK-NOT: DW_TAG 89; CHECK: DW_AT_abstract_origin {{.*}} "s" 90 91@t = external global i32 92 93; Function Attrs: uwtable 94define void @_Z1bv() #0 !dbg !4 { 95entry: 96 tail call void @llvm.dbg.value(metadata i1 false, metadata !25, metadata !DIExpression()), !dbg !27 97 tail call void @_Z1fi(i32 0), !dbg !28 98 ret void, !dbg !29 99} 100 101; Function Attrs: uwtable 102define void @_Z1ab(i1 zeroext %u) #0 !dbg !8 { 103entry: 104 tail call void @llvm.dbg.value(metadata i1 %u, metadata !13, metadata !DIExpression()), !dbg !30 105 tail call void @llvm.dbg.value(metadata i1 %u, metadata !31, metadata !DIExpression()), !dbg !33 106 br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34 107 108if.then.i: ; preds = %entry 109 %0 = load i32, ptr @t, align 4, !dbg !35, !tbaa !36 110 tail call void @llvm.dbg.value(metadata i32 %0, metadata !40, metadata !DIExpression()), !dbg !35 111 tail call void @_Z1fi(i32 %0), !dbg !41 112 br label %_Z1xb.exit, !dbg !42 113 114_Z1xb.exit: ; preds = %entry, %if.then.i 115 tail call void @_Z1fi(i32 0), !dbg !43 116 ret void, !dbg !44 117} 118 119declare void @_Z1fi(i32) #1 120 121; Function Attrs: nounwind readnone 122declare void @llvm.dbg.value(metadata, metadata, metadata) #2 123 124attributes #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" } 125attributes #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" } 126attributes #2 = { nounwind readnone } 127 128!llvm.dbg.cu = !{!0} 129!llvm.module.flags = !{!21, !22} 130!llvm.ident = !{!23} 131 132!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) 133!1 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 134!2 = !{} 135!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) 136!5 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 137!6 = !DISubroutineType(types: !7) 138!7 = !{null} 139!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) 140!9 = !DISubroutineType(types: !10) 141!10 = !{null, !11} 142!11 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean) 143!12 = !{!13} 144!13 = !DILocalVariable(name: "u", line: 17, arg: 1, scope: !8, file: !5, type: !11) 145!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) 146!15 = !{!16, !17} 147!16 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 148!17 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 149!18 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !19) 150!19 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !14) 151!20 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 152!21 = !{i32 2, !"Dwarf Version", i32 4} 153!22 = !{i32 2, !"Debug Info Version", i32 3} 154!23 = !{!"clang version 3.5.0 "} 155!24 = !{i1 false} 156!25 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 157!26 = !DILocation(line: 14, scope: !4) 158!27 = !DILocation(line: 5, scope: !14, inlinedAt: !26) 159!28 = !DILocation(line: 10, scope: !14, inlinedAt: !26) 160!29 = !DILocation(line: 15, scope: !4) 161!30 = !DILocation(line: 17, scope: !8) 162!31 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 163!32 = !DILocation(line: 18, scope: !8) 164!33 = !DILocation(line: 5, scope: !14, inlinedAt: !32) 165!34 = !DILocation(line: 6, scope: !19, inlinedAt: !32) 166!35 = !DILocation(line: 7, scope: !18, inlinedAt: !32) 167!36 = !{!37, !37, i64 0} 168!37 = !{!"int", !38, i64 0} 169!38 = !{!"omnipotent char", !39, i64 0} 170!39 = !{!"Simple C/C++ TBAA"} 171!40 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 172!41 = !DILocation(line: 8, scope: !18, inlinedAt: !32) 173!42 = !DILocation(line: 9, scope: !18, inlinedAt: !32) 174!43 = !DILocation(line: 10, scope: !14, inlinedAt: !32) 175!44 = !DILocation(line: 19, scope: !8) 176