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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
17 lines
795 B
LLVM
17 lines
795 B
LLVM
; RUN: llc -split-dwarf=Enable -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
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; RUN: llvm-dwarfdump -debug-dump=all %t | FileCheck %s
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; The source is an empty file.
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; CHECK: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x0c1e629c9e5ada4f)
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; CHECK: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x0c1e629c9e5ada4f)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 188230) (llvm/trunk 188234)", isOptimized: false, splitDebugFilename: "foo.dwo", emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "foo.c", directory: "/usr/local/google/home/echristo/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 3}
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!4 = !{i32 1, !"Debug Info Version", i32 3}
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