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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
39 lines
2.1 KiB
LLVM
39 lines
2.1 KiB
LLVM
; RUN: llc < %s -break-anti-dependencies=all -march=ppc64 -mcpu=g5 | FileCheck %s
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; CHECK-LABEL: main:
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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-v128:128:128-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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define i32 @main(i32 %argc, i8** nocapture %argv) nounwind readnone !dbg !5 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %argc, i64 0, metadata !15, metadata !DIExpression()), !dbg !17
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tail call void @llvm.dbg.value(metadata i8** %argv, i64 0, metadata !16, metadata !DIExpression()), !dbg !18
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%add = add nsw i32 %argc, 1, !dbg !19
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ret i32 %add, !dbg !19
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}
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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 = !{!22}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1", isOptimized: true, emissionKind: FullDebug, file: !21, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, file: !21, scope: null, type: !7, variables: !13)
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!6 = !DIFile(filename: "dbg.c", directory: "/src")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !9, !10}
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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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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !11)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_unsigned_char)
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!13 = !{!15, !16}
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!15 = !DILocalVariable(name: "argc", line: 1, arg: 1, scope: !5, file: !6, type: !9)
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!16 = !DILocalVariable(name: "argv", line: 1, arg: 2, scope: !5, file: !6, type: !10)
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!17 = !DILocation(line: 1, column: 14, scope: !5)
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!18 = !DILocation(line: 1, column: 26, scope: !5)
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!19 = !DILocation(line: 2, column: 3, scope: !20)
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!20 = distinct !DILexicalBlock(line: 1, column: 34, file: !21, scope: !5)
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!21 = !DIFile(filename: "dbg.c", directory: "/src")
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!22 = !{i32 1, !"Debug Info Version", i32 3}
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