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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
30 lines
1.4 KiB
LLVM
30 lines
1.4 KiB
LLVM
; Check that DEBUG_VALUE comments come through on a variety of targets.
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define i32 @main() nounwind ssp !dbg !0 {
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entry:
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; CHECK: DEBUG_VALUE
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !7, metadata !DIExpression()), !dbg !9
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ret i32 0, !dbg !10
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!13}
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!0 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !2, file: !12, scope: !1, type: !3)
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!1 = !DIFile(filename: "/tmp/x.c", directory: "/Users/manav")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 120996)", isOptimized: false, emissionKind: FullDebug, file: !12, enums: !6, retainedTypes: !6)
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = !{}
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!7 = !DILocalVariable(name: "i", line: 3, scope: !8, file: !1, type: !5)
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!8 = distinct !DILexicalBlock(line: 2, column: 12, file: !12, scope: !0)
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!9 = !DILocation(line: 3, column: 11, scope: !8)
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!10 = !DILocation(line: 4, column: 2, scope: !8)
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!12 = !DIFile(filename: "/tmp/x.c", directory: "/Users/manav")
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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