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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
31 lines
1.3 KiB
LLVM
31 lines
1.3 KiB
LLVM
; RUN: llc < %s -o /dev/null
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define void @bar(i32 %i) nounwind uwtable ssp !dbg !5 {
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entry:
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tail call void (...) @foo() nounwind, !dbg !14
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ret void, !dbg !16
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}
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declare void @foo(...)
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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 = !{!18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: FullDebug, file: !17, enums: !1, retainedTypes: !1, globals: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "bar", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, file: !17, scope: !6, type: !7, variables: !9)
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!6 = !DIFile(filename: "cf.c", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!11}
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!11 = !DILocalVariable(name: "i", line: 3, arg: 1, scope: !5, file: !17, type: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !DILocation(line: 3, column: 14, scope: !5)
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!14 = !DILocation(line: 4, column: 3, scope: !15)
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!15 = distinct !DILexicalBlock(line: 3, column: 17, file: !17, scope: !5)
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!16 = !DILocation(line: 5, column: 1, scope: !15)
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!17 = !DIFile(filename: "cf.c", directory: "/private/tmp")
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!18 = !{i32 1, !"Debug Info Version", i32 3}
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