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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
23 lines
935 B
LLVM
23 lines
935 B
LLVM
; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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!llvm.module.flags = !{!6}
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!llvm.dbg.cu = !{!5}
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!0 = !DISubprogram(name: "bar", linkageName: "_ZN3foo3barEv", line: 3, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagProtected | DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !4, scope: !1, type: !2)
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!1 = !DIFile(filename: "/foo", directory: "bar.cpp")
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!2 = !DISubroutineType(types: !3)
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!3 = !{null}
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!4 = !DIFile(filename: "/foo", directory: "bar.cpp")
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!5 = distinct !DICompileUnit(language: DW_LANG_C99, isOptimized: true, emissionKind: FullDebug, file: !4, enums: !{}, retainedTypes: !{})
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define <{i32, i32}> @f1() !dbg !0 {
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; CHECK: !dbgx ![[NUMBER:[0-9]+]]
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%r = insertvalue <{ i32, i32 }> zeroinitializer, i32 4, 1, !dbgx !1
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; CHECK: !dbgx ![[NUMBER]]
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%e = extractvalue <{ i32, i32 }> %r, 0, !dbgx !1
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ret <{ i32, i32 }> %r
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}
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; CHECK: DIFlagProtected
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!6 = !{i32 1, !"Debug Info Version", i32 3}
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