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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
30 lines
1.4 KiB
LLVM
30 lines
1.4 KiB
LLVM
; RUN: echo '!9 = !{!"%/T/version.ll", !0}' > %t1
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; RUN: cat %s %t1 > %t2
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; RUN: opt -insert-gcov-profiling -disable-output < %t2
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; RUN: head -c8 %T/version.gcno | grep '^oncg.204'
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; RUN: rm %T/version.gcno
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; RUN: not opt -insert-gcov-profiling -default-gcov-version=asdfasdf -disable-output < %t2
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; RUN: opt -insert-gcov-profiling -default-gcov-version=407* -disable-output < %t2
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; RUN: head -c8 %T/version.gcno | grep '^oncg.704'
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; RUN: rm %T/version.gcno
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define void @test() !dbg !5 {
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ret void, !dbg !8
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}
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!llvm.gcov = !{!9}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 176994)", isOptimized: false, emissionKind: FullDebug, file: !11, enums: !3, retainedTypes: !3, globals: !3)
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!2 = !DIFile(filename: "version", directory: "/usr/local/google/home/nlewycky")
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!3 = !{}
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!5 = distinct !DISubprogram(name: "test", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !10, scope: !6, type: !7, variables: !3)
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!6 = !DIFile(filename: "<stdin>", directory: ".")
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!7 = !DISubroutineType(types: !{null})
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!8 = !DILocation(line: 1, scope: !5)
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;; !9 is added through the echo line at the top.
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!10 = !DIFile(filename: "<stdin>", directory: ".")
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!11 = !DIFile(filename: "version", directory: "/usr/local/google/home/nlewycky")
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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