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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
22 lines
987 B
LLVM
22 lines
987 B
LLVM
; RUN: llc < %s | FileCheck %s
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; Radar 10147769
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; Do not unnecessarily use AT_specification DIE.
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; CHECK-NOT: AT_specification
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@a = common global [10 x i32] zeroinitializer, align 16
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 140253)", isOptimized: true, emissionKind: FullDebug, file: !11, enums: !2, retainedTypes: !2, globals: !3)
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!2 = !{}
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!3 = !{!5}
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!5 = !DIGlobalVariable(name: "a", line: 1, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: [10 x i32]* @a)
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!6 = !DIFile(filename: "x.c", directory: "/private/tmp")
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!7 = !DICompositeType(tag: DW_TAG_array_type, size: 320, align: 32, baseType: !8, elements: !9)
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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 = !{!10}
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!10 = !DISubrange(count: 10)
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!11 = !DIFile(filename: "x.c", directory: "/private/tmp")
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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