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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
15 lines
543 B
LLVM
15 lines
543 B
LLVM
; RUN: llvm-dis < %s.bc | FileCheck %s
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; Check that subprogram definitions are correctly upgraded to 'distinct'.
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; Bitcode compiled with llvm-as version 3.7.
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define void @f() !dbg !3 { ret void }
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!llvm.module.flags = !{!4}
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!llvm.dbg.cu = !{!0}
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!0 = distinct !DICompileUnit(language: 12, file: !1, subprograms: !{!3})
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!1 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
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; CHECK: = distinct !DISubprogram({{.*}}, isDefinition: true
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!3 = !DISubprogram(name: "foo", isDefinition: true)
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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