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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
45 lines
2.0 KiB
LLVM
45 lines
2.0 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Check that two compile units are generated
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; CHECK: Compile Unit:
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; CHECK: Compile Unit:
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define i32 @foo() nounwind readnone ssp !dbg !2 {
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return:
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ret i32 42, !dbg !0
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}
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define i32 @bar() nounwind readnone ssp !dbg !10 {
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return:
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ret i32 21, !dbg !8
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}
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!llvm.dbg.cu = !{!4, !12}
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!llvm.module.flags = !{!21}
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!16 = !{!2}
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!17 = !{!10}
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!0 = !DILocation(line: 3, scope: !1)
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!1 = distinct !DILexicalBlock(line: 2, column: 0, file: !18, scope: !2)
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!2 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !4, file: !18, scope: !3, type: !5)
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!3 = !DIFile(filename: "a.c", directory: "/tmp/")
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!4 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: FullDebug, file: !18, enums: !19, retainedTypes: !19)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DILocation(line: 3, scope: !9)
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!9 = distinct !DILexicalBlock(line: 2, column: 0, file: !20, scope: !10)
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!10 = distinct !DISubprogram(name: "bar", linkageName: "bar", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !12, file: !20, scope: !11, type: !13)
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!11 = !DIFile(filename: "b.c", directory: "/tmp/")
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!12 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: FullDebug, file: !20, enums: !19, retainedTypes: !19)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!15}
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!18 = !DIFile(filename: "a.c", directory: "/tmp/")
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!19 = !{}
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!20 = !DIFile(filename: "b.c", directory: "/tmp/")
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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