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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
56 lines
2.8 KiB
LLVM
56 lines
2.8 KiB
LLVM
; RUN: %llc_dwarf -O0 < %s | FileCheck %s -check-prefix ARGUMENT
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; RUN: %llc_dwarf -O0 < %s | FileCheck %s -check-prefix VARIABLE
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; PR 13202
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define i32 @main() uwtable !dbg !5 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !18, metadata !DIExpression()), !dbg !21
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !22, metadata !DIExpression()), !dbg !23
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tail call void @smth(i32 0), !dbg !24
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tail call void @smth(i32 0), !dbg !25
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ret i32 0, !dbg !19
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}
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declare void @smth(i32)
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!27}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.2 (trunk 159419)", isOptimized: true, emissionKind: FullDebug, file: !26, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !{i32 0}
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!2 = !{}
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!5 = distinct !DISubprogram(name: "main", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 10, file: !26, scope: !6, type: !7, variables: !2)
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!6 = !DIFile(filename: "inline-bug.cc", directory: "/tmp/dbginfo/pr13202")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = distinct !DISubprogram(name: "f", linkageName: "_ZL1fi", line: 3, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 3, file: !26, scope: !6, type: !11, variables: !13)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!9, !9}
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!13 = !{!15, !16}
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!15 = !DILocalVariable(name: "argument", line: 3, arg: 1, scope: !10, file: !6, type: !9)
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; Two DW_TAG_formal_parameter: one abstract and one inlined.
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; ARGUMENT: {{.*Abbrev.*DW_TAG_formal_parameter}}
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; ARGUMENT: {{.*Abbrev.*DW_TAG_formal_parameter}}
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; ARGUMENT-NOT: {{.*Abbrev.*DW_TAG_formal_parameter}}
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!16 = !DILocalVariable(name: "local", line: 4, scope: !10, file: !6, type: !9)
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; Two DW_TAG_variable: one abstract and one inlined.
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; VARIABLE: {{.*Abbrev.*DW_TAG_variable}}
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; VARIABLE: {{.*Abbrev.*DW_TAG_variable}}
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; VARIABLE-NOT: {{.*Abbrev.*DW_TAG_variable}}
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!18 = !DILocalVariable(name: "argument", line: 3, arg: 1, scope: !10, file: !6, type: !9)
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!19 = !DILocation(line: 11, column: 10, scope: !5)
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!21 = !DILocation(line: 3, column: 25, scope: !10, inlinedAt: !19)
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!22 = !DILocalVariable(name: "local", line: 4, scope: !10, file: !6, type: !9)
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!23 = !DILocation(line: 4, column: 16, scope: !10, inlinedAt: !19)
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!24 = !DILocation(line: 5, column: 3, scope: !10, inlinedAt: !19)
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!25 = !DILocation(line: 6, column: 3, scope: !10, inlinedAt: !19)
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!26 = !DIFile(filename: "inline-bug.cc", directory: "/tmp/dbginfo/pr13202")
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!27 = !{i32 1, !"Debug Info Version", i32 3}
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