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fb3abba237
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
41 lines
2.4 KiB
LLVM
41 lines
2.4 KiB
LLVM
; RUN: llc -o /dev/null < %s
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; Radar 7937664
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%struct.AppleEvent = type opaque
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define void @DisposeDMNotificationUPP(void (%struct.AppleEvent*)* %userUPP) "no-frame-pointer-elim-non-leaf" nounwind ssp {
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entry:
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%userUPP_addr = alloca void (%struct.AppleEvent*)* ; <void (%struct.AppleEvent*)**> [#uses=1]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata void (%struct.AppleEvent*)** %userUPP_addr, metadata !0, metadata !DIExpression(DW_OP_deref)), !dbg !13
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store void (%struct.AppleEvent*)* %userUPP, void (%struct.AppleEvent*)** %userUPP_addr
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br label %return, !dbg !14
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return: ; preds = %entry
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ret void, !dbg !14
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!19}
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!0 = !DILocalVariable(name: "userUPP", line: 7, arg: 1, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "DisposeDMNotificationUPP", linkageName: "DisposeDMNotificationUPP", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, file: !16, scope: null, type: !4)
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!2 = !DIFile(filename: "t.c", directory: "/Users/echeng/LLVM/radars/r7937664/")
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!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 9999)", isOptimized: true, emissionKind: FullDebug, file: !16, enums: !17, retainedTypes: !17)
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!4 = !DISubroutineType(types: !5)
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!5 = !{null, !6}
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; Manually modified to avoid dependence on pointer size in generic test
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!6 = !DIDerivedType(tag: DW_TAG_typedef, name: "DMNotificationUPP", line: 6, file: !16, scope: !2, baseType: !8)
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!7 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !16, scope: !2, baseType: !8)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10}
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !16, scope: !2, baseType: !11)
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!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "AppleEvent", line: 4, file: !16, scope: !2, baseType: !12)
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!12 = !DICompositeType(tag: DW_TAG_structure_type, name: "AEDesc", line: 1, flags: DIFlagFwdDecl, file: !16, scope: !2)
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!13 = !DILocation(line: 7, scope: !1)
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!14 = !DILocation(line: 8, scope: !15)
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!15 = distinct !DILexicalBlock(line: 7, column: 0, file: !16, scope: !1)
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!16 = !DIFile(filename: "t.c", directory: "/Users/echeng/LLVM/radars/r7937664/")
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!17 = !{}
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!19 = !{i32 1, !"Debug Info Version", i32 3}
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