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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
40 lines
1.8 KiB
LLVM
40 lines
1.8 KiB
LLVM
; RUN: llvm-link %s %S/Inputs/mdlocation.ll -o - -S | FileCheck %s
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; Test that DILocations are remapped properly.
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define void @foo() !dbg !0 {
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ret void, !dbg !3
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}
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; CHECK: !named = !{!0, !7, !8, !9, !10, !11, !15, !16, !17, !18}
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!named = !{!1, !2, !3, !4, !5}
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; CHECK: !0 = !DILocation(line: 3, column: 7, scope: !1)
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; CHECK: !3 = distinct !DISubprogram(
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; CHECK: !7 = !DILocation(line: 3, column: 7, scope: !1, inlinedAt: !0)
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; CHECK: !8 = !DILocation(line: 3, column: 7, scope: !1, inlinedAt: !7)
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; CHECK: !9 = distinct !DILocation(line: 3, column: 7, scope: !1)
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; CHECK: !10 = distinct !DILocation(line: 3, column: 7, scope: !1, inlinedAt: !9)
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; CHECK: !11 = !DILocation(line: 3, column: 7, scope: !12)
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; CHECK: !13 = distinct !DISubprogram(
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; CHECK: !15 = !DILocation(line: 3, column: 7, scope: !12, inlinedAt: !11)
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; CHECK: !16 = !DILocation(line: 3, column: 7, scope: !12, inlinedAt: !15)
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; CHECK: !17 = distinct !DILocation(line: 3, column: 7, scope: !12)
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; CHECK: !18 = distinct !DILocation(line: 3, column: 7, scope: !12, inlinedAt: !17)
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!0 = distinct !DISubprogram(file: !7, scope: !7, line: 1, name: "foo", type: !9, unit: !6)
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!1 = !DILocation(line: 3, column: 7, scope: !10)
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!2 = !DILocation(line: 3, column: 7, scope: !10, inlinedAt: !1)
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!3 = !DILocation(line: 3, column: 7, scope: !10, inlinedAt: !2)
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; Test distinct nodes.
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!4 = distinct !DILocation(line: 3, column: 7, scope: !10)
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!5 = distinct !DILocation(line: 3, column: 7, scope: !10, inlinedAt: !4)
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!llvm.dbg.cu = !{!6}
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!6 = distinct !DICompileUnit(language: DW_LANG_C89, file: !7)
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!7 = !DIFile(filename: "source.c", directory: "/dir")
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!llvm.module.flags = !{!8}
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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!9 = !DISubroutineType(types: !{})
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!10 = distinct !DILexicalBlock(line: 3, column: 3, file: !7, scope: !0)
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