1; REQUIRES: object-emission 2 3; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s 4 5; Build from the following source with clang -O2. 6 7; The important details are that 'x's abstract definition is first built during 8; the definition of 'b', where the parameter to 'x' is constant and so 'x's 's' 9; variable is optimized away. No abstract definition DIE for 's' is constructed. 10; Then, during 'a' emission, the abstract DbgVariable for 's' is created, but 11; the abstract DIE isn't (since the abstract definition for 'b' is already 12; built). This results in 's' inlined in 'a' being emitted with its name, line, 13; file there, rather than referencing an abstract definition. 14 15; extern int t; 16; 17; void f(int); 18; 19; inline void x(bool b) { 20; if (b) { 21; int s = t; 22; f(s); 23; } 24; f(0); 25; } 26; 27; void b() { 28; x(false); 29; } 30; 31; void a(bool u) { 32; x(u); 33; } 34 35; CHECK: [[X_DECL:.*]]: DW_TAG_subprogram 36; CHECK-NOT: DW_TAG 37; CHECK: DW_AT_name {{.*}} "x" 38; CHECK-NOT: {{DW_TAG|NULL}} 39; CHECK: DW_TAG_formal_parameter 40; CHECK-NOT: DW_TAG 41; CHECK: DW_AT_name {{.*}} "b" 42; CHECK-NOT: {{DW_TAG|NULL}} 43; CHECK: DW_TAG_lexical_block 44; CHECK-NOT: {{DW_TAG|NULL}} 45; CHECK: DW_TAG_variable 46; CHECK-NOT: DW_TAG 47; CHECK: DW_AT_name {{.*}} "s" 48 49; CHECK: DW_TAG_subprogram 50; CHECK-NOT: DW_TAG 51; CHECK: DW_AT_name {{.*}} "b" 52; CHECK-NOT: {{DW_TAG|NULL}} 53; CHECK: DW_TAG_inlined_subroutine 54; CHECK-NOT: DW_TAG 55; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]} 56; CHECK-NOT: {{DW_TAG|NULL}} 57; CHECK: DW_TAG_formal_parameter 58; CHECK-NOT: DW_TAG 59; CHECK: DW_AT_abstract_origin {{.*}} "b" 60; Notice 'x's local variable 's' is missing. Not necessarily a bug here, 61; since it's been optimized entirely away and it should be described in 62; abstract subprogram. 63; CHECK-NOT: DW_TAG 64; CHECK: NULL 65; CHECK-NOT: DW_TAG 66; CHECK: NULL 67 68; CHECK: DW_TAG_subprogram 69; CHECK-NOT: DW_TAG 70; CHECK: DW_AT_name {{.*}} "a" 71; CHECK-NOT: {{DW_TAG|NULL}} 72; CHECK: DW_TAG_formal_parameter 73; CHECK-NOT: {{DW_TAG|NULL}} 74; CHECK: DW_TAG_inlined_subroutine 75; CHECK-NOT: DW_TAG 76; CHECK: DW_AT_abstract_origin {{.*}} {[[X_DECL]]} 77; CHECK-NOT: {{DW_TAG|NULL}} 78; FIXME: This formal parameter goes missing at least at -O2 (& on 79; mips/powerpc), maybe before that. Perhaps SelectionDAG is to blame (and 80; fastisel succeeds). 81; CHECK: DW_TAG_formal_parameter 82; CHECK-NOT: DW_TAG 83; CHECK: DW_AT_abstract_origin {{.*}} "b" 84 85; CHECK-NOT: {{DW_TAG|NULL}} 86; CHECK: DW_TAG_lexical_block 87; CHECK-NOT: {{DW_TAG|NULL}} 88; CHECK: DW_TAG_variable 89; CHECK-NOT: DW_TAG 90; CHECK: DW_AT_abstract_origin {{.*}} "s" 91 92@t = external global i32 93 94; Function Attrs: uwtable 95define void @_Z1bv() #0 !dbg !4 { 96entry: 97 tail call void @llvm.dbg.value(metadata i1 false, metadata !25, metadata !DIExpression()), !dbg !27 98 tail call void @_Z1fi(i32 0), !dbg !28 99 ret void, !dbg !29 100} 101 102; Function Attrs: uwtable 103define void @_Z1ab(i1 zeroext %u) #0 !dbg !8 { 104entry: 105 tail call void @llvm.dbg.value(metadata i1 %u, metadata !13, metadata !DIExpression()), !dbg !30 106 tail call void @llvm.dbg.value(metadata i1 %u, metadata !31, metadata !DIExpression()), !dbg !33 107 br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34 108 109if.then.i: ; preds = %entry 110 %0 = load i32, i32* @t, align 4, !dbg !35, !tbaa !36 111 tail call void @llvm.dbg.value(metadata i32 %0, metadata !40, metadata !DIExpression()), !dbg !35 112 tail call void @_Z1fi(i32 %0), !dbg !41 113 br label %_Z1xb.exit, !dbg !42 114 115_Z1xb.exit: ; preds = %entry, %if.then.i 116 tail call void @_Z1fi(i32 0), !dbg !43 117 ret void, !dbg !44 118} 119 120declare void @_Z1fi(i32) #1 121 122; Function Attrs: nounwind readnone 123declare void @llvm.dbg.value(metadata, metadata, metadata) #2 124 125attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 126attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 127attributes #2 = { nounwind readnone } 128 129!llvm.dbg.cu = !{!0} 130!llvm.module.flags = !{!21, !22} 131!llvm.ident = !{!23} 132 133!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) 134!1 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 135!2 = !{} 136!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) 137!5 = !DIFile(filename: "missing-abstract-variables.cc", directory: "/tmp/dbginfo") 138!6 = !DISubroutineType(types: !7) 139!7 = !{null} 140!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) 141!9 = !DISubroutineType(types: !10) 142!10 = !{null, !11} 143!11 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean) 144!12 = !{!13} 145!13 = !DILocalVariable(name: "u", line: 17, arg: 1, scope: !8, file: !5, type: !11) 146!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) 147!15 = !{!16, !17} 148!16 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 149!17 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 150!18 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !19) 151!19 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !14) 152!20 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 153!21 = !{i32 2, !"Dwarf Version", i32 4} 154!22 = !{i32 2, !"Debug Info Version", i32 3} 155!23 = !{!"clang version 3.5.0 "} 156!24 = !{i1 false} 157!25 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 158!26 = !DILocation(line: 14, scope: !4) 159!27 = !DILocation(line: 5, scope: !14, inlinedAt: !26) 160!28 = !DILocation(line: 10, scope: !14, inlinedAt: !26) 161!29 = !DILocation(line: 15, scope: !4) 162!30 = !DILocation(line: 17, scope: !8) 163!31 = !DILocalVariable(name: "b", line: 5, arg: 1, scope: !14, file: !5, type: !11) 164!32 = !DILocation(line: 18, scope: !8) 165!33 = !DILocation(line: 5, scope: !14, inlinedAt: !32) 166!34 = !DILocation(line: 6, scope: !19, inlinedAt: !32) 167!35 = !DILocation(line: 7, scope: !18, inlinedAt: !32) 168!36 = !{!37, !37, i64 0} 169!37 = !{!"int", !38, i64 0} 170!38 = !{!"omnipotent char", !39, i64 0} 171!39 = !{!"Simple C/C++ TBAA"} 172!40 = !DILocalVariable(name: "s", line: 7, scope: !18, file: !5, type: !20) 173!41 = !DILocation(line: 8, scope: !18, inlinedAt: !32) 174!42 = !DILocation(line: 9, scope: !18, inlinedAt: !32) 175!43 = !DILocation(line: 10, scope: !14, inlinedAt: !32) 176!44 = !DILocation(line: 19, scope: !8) 177