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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> llvm-svn: 266446
71 lines
4.0 KiB
LLVM
71 lines
4.0 KiB
LLVM
; RUN: %llc_dwarf -O0 < %s | grep AT_decl_file | grep 2
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; Here _ZN1S3fooEv is defined in header file identified as AT_decl_file no. 2 in debug info.
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%struct.S = type <{ i8 }>
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define i32 @_Z3barv() nounwind ssp !dbg !3 {
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entry:
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%retval = alloca i32 ; <i32*> [#uses=2]
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%0 = alloca i32 ; <i32*> [#uses=2]
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%s1 = alloca %struct.S ; <%struct.S*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata %struct.S* %s1, metadata !0, metadata !DIExpression()), !dbg !16
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%1 = call i32 @_ZN1S3fooEv(%struct.S* %s1) nounwind, !dbg !17 ; <i32> [#uses=1]
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store i32 %1, i32* %0, align 4, !dbg !17
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%2 = load i32, i32* %0, align 4, !dbg !17 ; <i32> [#uses=1]
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store i32 %2, i32* %retval, align 4, !dbg !17
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br label %return, !dbg !17
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return: ; preds = %entry
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%retval1 = load i32, i32* %retval, !dbg !17 ; <i32> [#uses=1]
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ret i32 %retval1, !dbg !16
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}
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define linkonce_odr i32 @_ZN1S3fooEv(%struct.S* %this) nounwind ssp align 2 !dbg !12 {
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entry:
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%this_addr = alloca %struct.S* ; <%struct.S**> [#uses=1]
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%retval = alloca i32 ; <i32*> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata %struct.S** %this_addr, metadata !18, metadata !DIExpression(DW_OP_deref)), !dbg !21
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store %struct.S* %this, %struct.S** %this_addr
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br label %return, !dbg !21
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return: ; preds = %entry
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%retval1 = load i32, i32* %retval, !dbg !21 ; <i32> [#uses=1]
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ret i32 %retval1, !dbg !22
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!5}
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!llvm.module.flags = !{!28}
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!0 = !DILocalVariable(name: "s1", line: 3, scope: !1, file: !4, type: !9)
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!1 = distinct !DILexicalBlock(line: 3, column: 0, file: !25, scope: !2)
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!2 = distinct !DILexicalBlock(line: 3, column: 0, file: !25, scope: !3)
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!3 = distinct !DISubprogram(name: "bar", linkageName: "_Z3barv", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !5, scopeLine: 3, file: !25, scope: !4, type: !6)
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!4 = !DIFile(filename: "one.cc", directory: "/tmp/")
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!5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: FullDebug, file: !25, enums: !27, retainedTypes: !27, imports: null)
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", line: 2, size: 8, align: 8, file: !26, scope: !4, elements: !11)
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!10 = !DIFile(filename: "one.h", directory: "/tmp/")
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!11 = !{!12}
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!12 = distinct !DISubprogram(name: "foo", linkageName: "_ZN1S3fooEv", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !5, scopeLine: 3, file: !26, scope: !9, type: !13)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!8, !15}
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial, file: !25, scope: !4, baseType: !9)
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!16 = !DILocation(line: 3, scope: !1)
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!17 = !DILocation(line: 3, scope: !3)
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; Modified from being a pointer, to make this testcase independent of target pointer size
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!18 = !DILocalVariable(name: "this", line: 3, arg: 1, scope: !12, file: !10, type: !9)
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!19 = !DIDerivedType(tag: DW_TAG_const_type, size: 64, align: 64, flags: DIFlagArtificial, file: !25, scope: !4, baseType: !20)
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!20 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !25, scope: !4, baseType: !9)
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!21 = !DILocation(line: 3, scope: !12)
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!22 = !DILocation(line: 3, scope: !23)
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!23 = distinct !DILexicalBlock(line: 3, column: 0, file: !26, scope: !12)
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!25 = !DIFile(filename: "one.cc", directory: "/tmp/")
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!26 = !DIFile(filename: "one.h", directory: "/tmp/")
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!27 = !{}
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!28 = !{i32 1, !"Debug Info Version", i32 3}
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