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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
22 lines
987 B
LLVM
22 lines
987 B
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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@e = global i16 0, align 2
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.2 (trunk 165274) (llvm/trunk 165272)", isOptimized: false, emissionKind: FullDebug, file: !8, 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: "e", line: 2, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: i16* @e)
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!6 = !DIFile(filename: "foo.cpp", directory: "/tmp")
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!7 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "E", line: 1, size: 16, align: 16, flags: DIFlagFwdDecl, file: !8)
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!8 = !DIFile(filename: "foo.cpp", directory: "/tmp")
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; CHECK: DW_TAG_enumeration_type
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; CHECK-NEXT: DW_AT_name
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; CHECK-NEXT: DW_AT_byte_size
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; CHECK-NEXT: DW_AT_declaration
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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