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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
35 lines
1.8 KiB
LLVM
35 lines
1.8 KiB
LLVM
; RUN: llc -O0 < %s | FileCheck %s
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; Radar 10464995
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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-S128"
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target triple = "x86_64-apple-macosx10.7.2"
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@s = common global [4294967296 x i8] zeroinitializer, align 16
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; CHECK: .quad 4294967296 ## DW_AT_count
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define void @bar() nounwind uwtable ssp !dbg !5 {
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entry:
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store i8 97, i8* getelementptr inbounds ([4294967296 x i8], [4294967296 x i8]* @s, i32 0, i64 0), align 1, !dbg !18
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ret void, !dbg !20
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!22}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 144833)", isOptimized: false, emissionKind: FullDebug, file: !21, enums: !1, retainedTypes: !1, globals: !11, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "bar", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, file: !21, scope: !6, type: !7)
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!6 = !DIFile(filename: "small.c", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!11 = !{!13}
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!13 = !DIGlobalVariable(name: "s", line: 2, isLocal: false, isDefinition: true, scope: null, file: !6, type: !14, variable: [4294967296 x i8]* @s)
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!14 = !DICompositeType(tag: DW_TAG_array_type, size: 34359738368, align: 8, baseType: !15, elements: !16)
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!16 = !{!17}
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!17 = !DISubrange(count: 4294967296)
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!18 = !DILocation(line: 5, column: 3, scope: !19)
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!19 = distinct !DILexicalBlock(line: 4, column: 1, file: !21, scope: !5)
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!20 = !DILocation(line: 6, column: 1, scope: !19)
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!21 = !DIFile(filename: "small.c", directory: "/private/tmp")
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!22 = !{i32 1, !"Debug Info Version", i32 3}
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