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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
58 lines
2.6 KiB
LLVM
58 lines
2.6 KiB
LLVM
; RUN: opt -strip-dead-debug-info -verify %s -S | FileCheck %s
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; CHECK: ModuleID = '{{.*}}'
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; CHECK-NOT: bar
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; CHECK-NOT: abcd
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@xyz = global i32 2
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
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; Function Attrs: nounwind readnone ssp
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define i32 @fn() #1 !dbg !6 {
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entry:
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ret i32 0, !dbg !18
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}
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; Function Attrs: nounwind readonly ssp
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define i32 @foo(i32 %i) #2 !dbg !10 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !15, metadata !DIExpression()), !dbg !20
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%.0 = load i32, i32* @xyz, align 4
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ret i32 %.0, !dbg !21
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}
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attributes #0 = { nounwind readnone }
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attributes #1 = { nounwind readnone ssp }
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attributes #2 = { nounwind readonly ssp }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!25}
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!0 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !{}, retainedTypes: !{}, globals: !24)
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!1 = !DIFile(filename: "g.c", directory: "/tmp/")
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!2 = !{null}
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!3 = distinct !DISubprogram(name: "bar", line: 5, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, file: !1, scope: null, type: !4)
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!4 = !DISubroutineType(types: !2)
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!5 = !DIFile(filename: "g.c", directory: "/tmp/")
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!6 = distinct !DISubprogram(name: "fn", linkageName: "fn", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, file: !1, scope: null, type: !7)
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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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!10 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, file: !1, scope: null, type: !11)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!9, !9}
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!13 = !DILocalVariable(name: "bb", line: 5, scope: !14, file: !5, type: !9)
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!14 = distinct !DILexicalBlock(line: 5, column: 0, file: !1, scope: !3)
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!15 = !DILocalVariable(name: "i", line: 7, arg: 1, scope: !10, file: !5, type: !9)
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!16 = !DIGlobalVariable(name: "abcd", line: 2, isLocal: true, isDefinition: true, scope: !5, file: !5, type: !9)
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!17 = !DIGlobalVariable(name: "xyz", line: 3, isLocal: false, isDefinition: true, scope: !5, file: !5, type: !9, variable: i32* @xyz)
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!18 = !DILocation(line: 6, scope: !19)
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!19 = distinct !DILexicalBlock(line: 6, column: 0, file: !1, scope: !6)
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!20 = !DILocation(line: 7, scope: !10)
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!21 = !DILocation(line: 10, scope: !22)
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!22 = distinct !DILexicalBlock(line: 7, column: 0, file: !1, scope: !10)
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!24 = !{!16, !17}
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!25 = !{i32 1, !"Debug Info Version", i32 3}
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