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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
21 lines
870 B
LLVM
21 lines
870 B
LLVM
; RUN: opt < %s -verify -S | FileCheck %s
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; CHECK: DW_LANG_Mips_Assembler
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define void @Foo(i32 %a, i32 %b) {
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entry:
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call void @llvm.dbg.declare(metadata i32* null, metadata !1, metadata !DIExpression()), !dbg !DILocation(scope: !6)
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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 = !{!5}
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!2 = distinct !DICompileUnit(language: DW_LANG_Mips_Assembler, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !4, enums: !3, retainedTypes: !3, globals: !3, imports: !3)
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!3 = !{}
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!0 = !DILocation(line: 662302, column: 26, scope: !1)
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!1 = !DILocalVariable(name: "foo", scope: !6)
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!4 = !DIFile(filename: "scratch.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!6 = distinct !DISubprogram(unit: !2)
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!5 = !{i32 1, !"Debug Info Version", i32 3}
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