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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
25 lines
1.1 KiB
LLVM
25 lines
1.1 KiB
LLVM
; RUN: llc < %s -o /dev/null
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; PR 5942
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define i8* @foo() nounwind {
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entry:
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%0 = load i32, i32* undef, align 4, !dbg !0 ; <i32> [#uses=1]
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%1 = inttoptr i32 %0 to i8*, !dbg !0 ; <i8*> [#uses=1]
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ret i8* %1, !dbg !10
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!14}
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!0 = !DILocation(line: 571, column: 3, scope: !1)
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!1 = distinct !DILexicalBlock(line: 1, column: 1, file: !11, scope: !2)
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!2 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 561, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, scope: !3, type: !4)
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: FullDebug, file: !11, enums: !12, retainedTypes: !12)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!10 = !DILocation(line: 588, column: 1, scope: !2)
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!11 = !DIFile(filename: "hashtab.c", directory: "/usr/src/gnu/usr.bin/cc/cc_tools/../../../../contrib/gcclibs/libiberty")
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!12 = !{}
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!14 = !{i32 1, !"Debug Info Version", i32 3}
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