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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
24 lines
931 B
LLVM
24 lines
931 B
LLVM
; RUN: llc -mtriple x86_64-pc-linux-gnu < %s | FileCheck %s
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; CHECK: .long .Lline_table_start0 # DW_AT_stmt_list
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; CHECK: .section .debug_line,"",@progbits
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; CHECK-NEXT: .Lline_table_start0:
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define void @f() !dbg !0 {
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entry:
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ret void
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7}
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!5 = !{!0}
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!0 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, scopeLine: 1, file: !6, scope: !1, type: !3)
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!1 = !DIFile(filename: "test2.c", directory: "/home/espindola/llvm")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: FullDebug, file: !6, enums: !{}, retainedTypes: !{})
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!6 = !DIFile(filename: "test2.c", directory: "/home/espindola/llvm")
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!7 = !{i32 1, !"Debug Info Version", i32 3}
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