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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
37 lines
1.7 KiB
LLVM
37 lines
1.7 KiB
LLVM
; RUN: opt -instcombine -S %s | FileCheck %s
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%foo = type { i8 }
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; Function Attrs: nounwind uwtable
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define void @_ZN4llvm13ScaledNumbers10multiply64Emm() {
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entry:
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%getU = alloca %foo, align 1
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; This is supposed to make sure that the declare conversion, does not accidentally think the store OF
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; %getU is a store TO %getU. There are valid reasons to have an llvm.dbg.value here, but if the pass
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; is changed to emit such, a more specific check should be added to make sure that any llvm.dbg.value
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; is correct.
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; CHECK-NOT: @llvm.dbg.value(metadata %foo* %getU
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call void @llvm.dbg.declare(metadata %foo* %getU, metadata !3, metadata !6), !dbg !7
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store %foo* %getU, %foo** undef, align 8, !tbaa !8
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unreachable
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (https://github.com/llvm-mirror/clang 89dda3855cda574f355e6defa1d77bdae5053994) (llvm/trunk 257597)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "none", directory: ".")
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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!3 = !DILocalVariable(name: "getU", scope: !4, file: !1, line: 25, type: !5)
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!4 = distinct !DISubprogram(name: "multiply64", linkageName: "_ZN4llvm13ScaledNumbers10multiply64Emm", scope: null, file: !1, line: 22, isLocal: false, isDefinition: true, scopeLine: 23, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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!5 = !DICompositeType(tag: DW_TAG_class_type, scope: !4, file: !1, line: 25, size: 8, align: 8)
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!6 = !DIExpression()
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!7 = !DILocation(line: 25, column: 8, scope: !4)
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!8 = !{!9, !9, i64 0}
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!9 = !{i64 0}
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