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fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
59 lines
3.3 KiB
LLVM
59 lines
3.3 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-linux-gnu %s -o %t -filetype=obj
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; Verify that we've emitted template arguments for the union
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; CHECK: DW_TAG_union_type
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; CHECK-NEXT: "Value<float>"
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; CHECK: DW_TAG_template_type_parameter
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; CHECK: "T"
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%"union.PR15637::Value" = type { i32 }
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@_ZN7PR156371fE = global %"union.PR15637::Value" zeroinitializer, align 4
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define void @_ZN7PR156371gEf(float %value) #0 !dbg !4 {
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entry:
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%value.addr = alloca float, align 4
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%tempValue = alloca %"union.PR15637::Value", align 4
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store float %value, float* %value.addr, align 4
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call void @llvm.dbg.declare(metadata float* %value.addr, metadata !23, metadata !DIExpression()), !dbg !24
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call void @llvm.dbg.declare(metadata %"union.PR15637::Value"* %tempValue, metadata !25, metadata !DIExpression()), !dbg !26
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ret void, !dbg !27
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!28}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 178499) (llvm/trunk 178472)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !9, imports: !2)
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!1 = !DIFile(filename: "foo.cc", directory: "/usr/local/google/home/echristo/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "g", linkageName: "_ZN7PR156371gEf", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DINamespace(name: "PR15637", line: 1, file: !1, scope: null)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "float", size: 32, align: 32, encoding: DW_ATE_float)
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!9 = !{!10}
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!10 = !DIGlobalVariable(name: "f", linkageName: "_ZN7PR156371fE", line: 6, isLocal: false, isDefinition: true, scope: !5, file: !11, type: !12, variable: %"union.PR15637::Value"* @_ZN7PR156371fE)
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!11 = !DIFile(filename: "foo.cc", directory: "/usr/local/google/home/echristo/tmp")
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!12 = !DICompositeType(tag: DW_TAG_union_type, name: "Value<float>", line: 2, size: 32, align: 32, file: !1, scope: !5, elements: !13, templateParams: !21)
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!13 = !{!14, !16}
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 2, size: 32, align: 32, file: !1, scope: !12, baseType: !15)
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!16 = !DISubprogram(name: "Value", line: 2, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !12, type: !17)
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!17 = !DISubroutineType(types: !18)
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!18 = !{null, !19}
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!19 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !12)
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!21 = !{!22}
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!22 = !DITemplateTypeParameter(name: "T", type: !8)
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!23 = !DILocalVariable(name: "value", line: 3, arg: 1, scope: !4, file: !11, type: !8)
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!24 = !DILocation(line: 3, scope: !4)
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!25 = !DILocalVariable(name: "tempValue", line: 4, scope: !4, file: !11, type: !12)
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!26 = !DILocation(line: 4, scope: !4)
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!27 = !DILocation(line: 5, scope: !4)
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!28 = !{i32 1, !"Debug Info Version", i32 3}
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