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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
26 lines
1.2 KiB
LLVM
26 lines
1.2 KiB
LLVM
; RUN: llc %s -o /dev/null
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; Here variable bar is optimized away. Do not trip over while trying to generate debug info.
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define i32 @foo() nounwind uwtable readnone ssp !dbg !5 {
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entry:
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ret i32 42, !dbg !15
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}
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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: !12)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, file: !17, scope: !6, type: !7)
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!6 = !DIFile(filename: "fb.c", directory: "/private/tmp")
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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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!12 = !{!14}
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!14 = !DIGlobalVariable(name: "bar", line: 2, isLocal: true, isDefinition: true, scope: !5, file: !6, type: !9)
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!15 = !DILocation(line: 3, column: 3, scope: !16)
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!16 = distinct !DILexicalBlock(line: 1, column: 11, file: !17, scope: !5)
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!17 = !DIFile(filename: "fb.c", directory: "/private/tmp")
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!18 = !{i32 1, !"Debug Info Version", i32 3}
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