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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
51 lines
2.8 KiB
LLVM
51 lines
2.8 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o %t < %s
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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%class.A = type { [42 x i32] }
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@a = global %class.A zeroinitializer, align 4
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; Check that we can handle non-default array bounds. In this case, the array
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; goes from [-3, 38].
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; CHECK: DW_TAG_class_type
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; CHECK: DW_TAG_member
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9a-f]*}}] = "x")
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + 0x{{[0-9a-f]*}} => {[[ARRAY:0x[0-9a-f]*]]})
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; CHECK: [[ARRAY]]: DW_TAG_array_type [{{.*}}] *
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + 0x{{[0-9a-f]*}} => {[[BASE:0x[0-9a-f]*]]})
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; CHECK: DW_TAG_subrange_type
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + 0x{{[0-9a-f]*}} => {[[BASE2:0x[0-9a-f]*]]})
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; CHECK-NEXT: DW_AT_lower_bound [DW_FORM_data8] (0xfffffffffffffffd)
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; CHECK-NEXT: DW_AT_count [DW_FORM_data1] (0x2a)
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; CHECK: [[BASE]]: DW_TAG_base_type
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; CHECK: [[BASE2]]: DW_TAG_base_type
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9a-f]*}}] = "sizetype")
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; CHECK-NEXT: DW_AT_byte_size [DW_FORM_data1] (0x08)
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; CHECK-NEXT: DW_AT_encoding [DW_FORM_data1] (DW_ATE_unsigned)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 169136)", isOptimized: false, emissionKind: FullDebug, file: !20, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = !DIGlobalVariable(name: "a", line: 1, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: %class.A* @a)
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!6 = !DIFile(filename: "t.cpp", directory: "/Volumes/Sandbox/llvm")
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!7 = !DICompositeType(tag: DW_TAG_class_type, name: "A", line: 1, align: 32, file: !20, elements: !8)
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!8 = !{!9, !14}
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "x", line: 1, flags: DIFlagPrivate, file: !20, scope: !7, baseType: !10)
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!10 = !DICompositeType(tag: DW_TAG_array_type, align: 32, baseType: !11, elements: !12)
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!12 = !{!13}
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!13 = !DISubrange(count: 42, lowerBound: -3)
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!14 = !DISubprogram(name: "A", line: 1, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !6, scope: !7, type: !15)
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!15 = !DISubroutineType(types: !16)
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!16 = !{null, !17}
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!17 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !7)
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!20 = !DIFile(filename: "t.cpp", directory: "/Volumes/Sandbox/llvm")
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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