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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
1.4 KiB
LLVM
31 lines
1.4 KiB
LLVM
; This file is used by 2011-08-04-Metadata.ll, so it doesn't actually do anything itself
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;
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; RUN: true
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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@x = internal global i32 0, align 4
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define void @bar() nounwind uwtable ssp !dbg !1 {
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entry:
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store i32 1, i32* @x, align 4, !dbg !7
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ret void, !dbg !7
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: FullDebug, file: !9, enums: !{}, retainedTypes: !{}, globals: !{!5})
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!1 = distinct !DISubprogram(name: "bar", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, file: !9, scope: !2, type: !3)
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!2 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DIGlobalVariable(name: "x", line: 1, isLocal: true, isDefinition: true, scope: !0, file: !2, type: !6, variable: i32* @x)
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 2, column: 14, scope: !8)
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!8 = distinct !DILexicalBlock(line: 2, column: 12, file: !9, scope: !1)
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!9 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
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!11 = !{i32 1, !"Debug Info Version", i32 3}
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