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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
67 lines
3.2 KiB
LLVM
67 lines
3.2 KiB
LLVM
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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; CHECK: define void @_Z3foov() !dbg !9
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define void @_Z3foov() !dbg !9 {
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ret void
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}
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; CHECK: !named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
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!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
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!0 = !{null}
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!1 = distinct !DICompositeType(tag: DW_TAG_structure_type)
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!2 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
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!3 = !DISubroutineType(types: !0)
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!4 = distinct !DICompositeType(tag: DW_TAG_structure_type)
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!5 = distinct !{}
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!6 = distinct !{}
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; CHECK: !7 = distinct !DISubprogram(scope: null, isLocal: false, isDefinition: true, isOptimized: false, unit: !8)
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!7 = distinct !DISubprogram(unit: !8)
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!8 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang",
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file: !2,
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isOptimized: true, flags: "-O2",
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splitDebugFilename: "abc.debug", emissionKind: 2)
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; CHECK: !9 = !DISubprogram(scope: null, isLocal: false, isDefinition: false, isOptimized: false)
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!9 = !DISubprogram(isDefinition: false)
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; CHECK: !10 = distinct !DISubprogram(name: "foo", linkageName: "_Zfoov", scope: !1, file: !2, line: 7, type: !3, isLocal: true, isDefinition: true, scopeLine: 8, containingType: !4, virtuality: DW_VIRTUALITY_pure_virtual, virtualIndex: 10, flags: DIFlagPrototyped, isOptimized: true, unit: !8, templateParams: !5, declaration: !9, variables: !6)
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!10 = distinct !DISubprogram(name: "foo", linkageName: "_Zfoov", scope: !1,
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file: !2, line: 7, type: !3, isLocal: true,
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isDefinition: true, scopeLine: 8,
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containingType: !4,
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virtuality: DW_VIRTUALITY_pure_virtual,
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virtualIndex: 10, flags: DIFlagPrototyped,
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isOptimized: true, unit: !8, templateParams: !5,
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declaration: !9, variables: !6)
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; CHECK: !11 = distinct !DISubprogram
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; CHECK-SAME: virtualIndex: 0,
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!11 = distinct !DISubprogram(name: "foo", linkageName: "_Zfoov", scope: !1,
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file: !2, line: 7, type: !3, isLocal: true,
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isDefinition: true, scopeLine: 8,
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containingType: !4,
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virtuality: DW_VIRTUALITY_pure_virtual,
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virtualIndex: 0,
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flags: DIFlagPrototyped, isOptimized: true,
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unit: !8, templateParams: !5, declaration: !9,
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variables: !6)
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; CHECK: !12 = distinct !DISubprogram
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; CHECK-NOT: virtualIndex
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!12 = distinct !DISubprogram(name: "foo", linkageName: "_Zfoov", scope: !1,
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file: !2, line: 7, type: !3, isLocal: true,
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isDefinition: true, scopeLine: 8,
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containingType: !4,
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virtuality: DW_VIRTUALITY_none,
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flags: DIFlagPrototyped, isOptimized: true,
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unit: !8,
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templateParams: !5, declaration: !9, variables: !6)
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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!llvm.module.flags = !{!13}
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!llvm.dbg.cu = !{!8}
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