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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
40 lines
1.7 KiB
LLVM
40 lines
1.7 KiB
LLVM
; RUN: %llc_dwarf -O0 < %s | FileCheck %s
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; Do not emit AT_upper_bound for an unbounded array.
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; radar 9241695
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define i32 @main() nounwind ssp !dbg !0 {
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entry:
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%retval = alloca i32, align 4
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%a = alloca [0 x i32], align 4
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store i32 0, i32* %retval
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call void @llvm.dbg.declare(metadata [0 x i32]* %a, metadata !6, metadata !DIExpression()), !dbg !11
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ret i32 0, !dbg !12
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!16}
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!0 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !2, scopeLine: 3, file: !14, scope: !1, type: !3)
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!1 = !DIFile(filename: "array.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (trunk 129138)", isOptimized: false, emissionKind: FullDebug, file: !14, enums: !15, retainedTypes: !15, imports: null)
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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 = !DILocalVariable(name: "a", line: 4, scope: !7, file: !1, type: !8)
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!7 = distinct !DILexicalBlock(line: 3, column: 12, file: !14, scope: !0)
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!8 = !DICompositeType(tag: DW_TAG_array_type, align: 32, file: !14, scope: !2, baseType: !5, elements: !9)
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!9 = !{!10}
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;CHECK: section_info:
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;CHECK: DW_TAG_subrange_type
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;CHECK-NEXT: DW_AT_type
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;CHECK-NOT: DW_AT_lower_bound
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;CHECK-NOT: DW_AT_upper_bound
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;CHECK-NEXT: End Of Children Mark
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!10 = !DISubrange(count: -1)
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!11 = !DILocation(line: 4, column: 7, scope: !7)
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!12 = !DILocation(line: 5, column: 3, scope: !7)
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!14 = !DIFile(filename: "array.c", directory: "/private/tmp")
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!15 = !{}
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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