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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
46 lines
2.5 KiB
LLVM
46 lines
2.5 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-apple-darwin %s -o %t -filetype=obj
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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@a = global i32 0, align 4
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@b = global i64 0, align 8
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@c = global i32 0, align 4
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!23}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.2 (trunk 157269) (llvm/trunk 157264)", isOptimized: false, emissionKind: FullDebug, file: !22, enums: !1, retainedTypes: !15, globals: !17, imports: !15)
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!1 = !{!3, !8, !12}
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!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "A", line: 1, size: 32, align: 32, file: !4, baseType: !5, elements: !6)
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!4 = !DIFile(filename: "foo.cpp", directory: "/Users/echristo/tmp")
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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 = !{!7}
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!7 = !DIEnumerator(name: "A1", value: 1) ; [ DW_TAG_enumerator ]
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!8 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "B", line: 2, size: 64, align: 64, file: !4, baseType: !9, elements: !10)
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "long unsigned int", size: 64, align: 64, encoding: DW_ATE_unsigned)
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!10 = !{!11}
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!11 = !DIEnumerator(name: "B1", value: 1) ; [ DW_TAG_enumerator ]
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!12 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "C", line: 3, size: 32, align: 32, file: !4, elements: !13)
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!13 = !{!14}
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!14 = !DIEnumerator(name: "C1", value: 1) ; [ DW_TAG_enumerator ]
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!15 = !{}
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!17 = !{!19, !20, !21}
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!19 = !DIGlobalVariable(name: "a", line: 4, isLocal: false, isDefinition: true, scope: null, file: !4, type: !3, variable: i32* @a)
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!20 = !DIGlobalVariable(name: "b", line: 5, isLocal: false, isDefinition: true, scope: null, file: !4, type: !8, variable: i64* @b)
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!21 = !DIGlobalVariable(name: "c", line: 6, isLocal: false, isDefinition: true, scope: null, file: !4, type: !12, variable: i32* @c)
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!22 = !DIFile(filename: "foo.cpp", directory: "/Users/echristo/tmp")
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; CHECK: DW_TAG_enumeration_type [{{.*}}]
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; CHECK: DW_AT_type [DW_FORM_ref4]
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; CHECK: DW_AT_enum_class [DW_FORM_flag_present] (true)
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[{{.*}}] = "A")
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; CHECK: DW_TAG_enumeration_type [{{.*}}] *
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; CHECK: DW_AT_type [DW_FORM_ref4]
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; CHECK: DW_AT_enum_class [DW_FORM_flag_present] (true)
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[{{.*}}] = "B")
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; CHECK: DW_TAG_enumeration_type [6]
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; CHECK-NOT: DW_AT_enum_class
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[{{.*}}] = "C")
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!23 = !{i32 1, !"Debug Info Version", i32 3}
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