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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> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
6.1 KiB
LLVM
96 lines
6.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin < %s -o -
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; PR16954
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;
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; Make sure that when we splice off the end of a machine basic block, we include
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; DBG_VALUE MI in the terminator sequence.
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@a = external global { i64, [56 x i8] }, align 32
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; Function Attrs: nounwind sspreq
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define i32 @_Z18read_response_sizev() #0 !dbg !9 {
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entry:
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tail call void @llvm.dbg.value(metadata !22, i64 0, metadata !23, metadata !DIExpression()), !dbg !39
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%0 = load i64, i64* getelementptr inbounds ({ i64, [56 x i8] }, { i64, [56 x i8] }* @a, i32 0, i32 0), align 8, !dbg !40
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tail call void @llvm.dbg.value(metadata i32 undef, i64 0, metadata !64, metadata !DIExpression()), !dbg !71
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%1 = trunc i64 %0 to i32
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ret i32 %1
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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attributes #0 = { sspreq }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21, !72}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !5, globals: !20, imports: !5)
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!1 = !DIFile(filename: "<unknown>", directory: "/Users/matt/ryan_bug")
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!2 = !{!3}
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!3 = !DICompositeType(tag: DW_TAG_enumeration_type, line: 20, size: 32, align: 32, file: !1, scope: !4, elements: !6)
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "C", line: 19, size: 8, align: 8, file: !1, elements: !5)
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!5 = !{}
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!6 = !{!7}
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!7 = !DIEnumerator(name: "max_frame_size", value: 0) ; [ DW_TAG_enumerator ] [max_frame_size :: 0]
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!9 = distinct !DISubprogram(name: "read_response_size", linkageName: "_Z18read_response_sizev", line: 27, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 27, file: !1, scope: !10, type: !11, variables: !14)
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!10 = !DIFile(filename: "<unknown>", directory: "/Users/matt/ryan_bug")
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!11 = !DISubroutineType(types: !12)
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!12 = !{!13}
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!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!14 = !{!15, !19}
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!15 = !DILocalVariable(name: "b", line: 28, scope: !9, file: !10, type: !16)
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!16 = !DICompositeType(tag: DW_TAG_structure_type, name: "B", line: 16, size: 32, align: 32, file: !1, elements: !17)
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!17 = !{!18}
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "end_of_file", line: 17, size: 32, align: 32, file: !1, scope: !16, baseType: !13)
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!19 = !DILocalVariable(name: "c", line: 29, scope: !9, file: !10, type: !13)
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!20 = !{}
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!21 = !{i32 2, !"Dwarf Version", i32 2}
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!22 = !{i64* getelementptr inbounds ({ i64, [56 x i8] }, { i64, [56 x i8] }* @a, i32 0, i32 0)}
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!23 = !DILocalVariable(name: "p2", line: 12, arg: 2, scope: !24, file: !10, type: !32)
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!24 = distinct !DISubprogram(name: "min<unsigned long long>", linkageName: "_ZN3__13minIyEERKT_S3_RS1_", line: 12, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 12, file: !1, scope: !25, type: !27, templateParams: !33, variables: !35)
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!25 = !DINamespace(name: "__1", line: 1, file: !26, scope: null)
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!26 = !DIFile(filename: "main.cpp", directory: "/Users/matt/ryan_bug")
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!27 = !DISubroutineType(types: !28)
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!28 = !{!29, !29, !32}
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!29 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !30)
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!30 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !31)
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!31 = !DIBasicType(tag: DW_TAG_base_type, name: "long long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
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!32 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !31)
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!33 = !{!34}
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!34 = !DITemplateTypeParameter(name: "_Tp", type: !31)
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!35 = !{!36, !37}
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!36 = !DILocalVariable(name: "p1", line: 12, arg: 1, scope: !24, file: !10, type: !29)
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!37 = !DILocalVariable(name: "p2", line: 12, arg: 2, scope: !24, file: !10, type: !32)
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!38 = !DILocation(line: 33, scope: !9)
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!39 = !DILocation(line: 12, scope: !24, inlinedAt: !38)
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!40 = !DILocation(line: 9, scope: !41, inlinedAt: !59)
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!41 = distinct !DISubprogram(name: "min<unsigned long long, __1::A>", linkageName: "_ZN3__13minIyNS_1AEEERKT_S4_RS2_T0_", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 8, file: !1, scope: !25, type: !42, templateParams: !53, variables: !55)
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!42 = !DISubroutineType(types: !43)
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!43 = !{!29, !29, !32, !44}
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!44 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", size: 8, align: 8, file: !1, scope: !25, elements: !45)
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!45 = !{!46}
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!46 = !DISubprogram(name: "operator()", linkageName: "_ZN3__11AclERKiS2_", line: 1, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 1, file: !1, scope: !44, type: !47)
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!47 = !DISubroutineType(types: !48)
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!48 = !{!13, !49, !50, !50}
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!49 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !44)
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!50 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !51)
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!51 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !13)
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!53 = !{!34, !54}
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!54 = !DITemplateTypeParameter(name: "_Compare", type: !44)
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!55 = !{!56, !57, !58}
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!56 = !DILocalVariable(name: "p1", line: 7, arg: 1, scope: !41, file: !10, type: !29)
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!57 = !DILocalVariable(name: "p2", line: 7, arg: 2, scope: !41, file: !10, type: !32)
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!58 = !DILocalVariable(name: "p3", line: 8, arg: 3, scope: !41, file: !10, type: !44)
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!59 = !DILocation(line: 13, scope: !24, inlinedAt: !38)
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!63 = !{i32 undef}
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!64 = !DILocalVariable(name: "p1", line: 1, arg: 2, scope: !65, file: !10, type: !50)
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!65 = distinct !DISubprogram(name: "operator()", linkageName: "_ZN3__11AclERKiS2_", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 2, file: !1, scope: !25, type: !47, declaration: !46, variables: !66)
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!66 = !{!67, !69, !70}
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!67 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !65, type: !68)
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!68 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !44)
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!69 = !DILocalVariable(name: "p1", line: 1, arg: 2, scope: !65, file: !10, type: !50)
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!70 = !DILocalVariable(name: "", line: 2, arg: 3, scope: !65, file: !10, type: !50)
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!71 = !DILocation(line: 1, scope: !65, inlinedAt: !40)
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!72 = !{i32 1, !"Debug Info Version", i32 3}
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