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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
23 lines
1.0 KiB
LLVM
23 lines
1.0 KiB
LLVM
; RUN: opt -S -simplifycfg < %s | FileCheck %s
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; Radar 9342286
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; Assign DebugLoc to trap instruction.
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define void @foo() nounwind ssp !dbg !0 {
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; CHECK: call void @llvm.trap(), !dbg
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store i32 42, i32* null, !dbg !5
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ret void, !dbg !7
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10}
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!0 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !2, file: !8, scope: !1, type: !3)
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!1 = !DIFile(filename: "foo.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "Apple clang version 3.0 (tags/Apple/clang-206.1) (based on LLVM 3.0svn)", isOptimized: true, emissionKind: FullDebug, file: !8, enums: !{}, retainedTypes: !{})
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DILocation(line: 4, column: 2, scope: !6)
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!6 = distinct !DILexicalBlock(line: 3, column: 12, file: !8, scope: !0)
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!7 = !DILocation(line: 5, column: 1, scope: !6)
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!8 = !DIFile(filename: "foo.c", directory: "/private/tmp")
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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