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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
24 lines
1.2 KiB
LLVM
24 lines
1.2 KiB
LLVM
; RUN: llc -O0 < %s -o /dev/null
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; llc should not crash on this optimized out debug info.
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; PR6588
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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define void @foo() {
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entry:
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call void @llvm.dbg.declare(metadata i32* undef, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !1)
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ret void
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}
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!llvm.dbg.cu = !{!3}
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!0 = !DILocalVariable(name: "sy", line: 890, arg: 1, scope: !1, file: !2, type: !7)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 892, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, file: !8, scope: !3, type: !4)
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!2 = !DIFile(filename: "qpainter.h", directory: "QtGui")
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!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang 1.1", isOptimized: true, emissionKind: FullDebug, file: !9, enums: !10, retainedTypes: !10)
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!4 = !DISubroutineType(types: !6)
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!5 = !DIFile(filename: "splineeditor.cpp", directory: "src")
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!6 = !{null}
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIFile(filename: "qpainter.h", directory: "QtGui")
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!9 = !DIFile(filename: "splineeditor.cpp", directory: "src")
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!10 = !{i32 0}
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