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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
52 lines
3.1 KiB
LLVM
52 lines
3.1 KiB
LLVM
; RUN: %llc_dwarf -march=x86 -asm-verbose < %s | grep DW_TAG_formal_parameter
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%struct.Pt = type { double, double }
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%struct.Rect = type { %struct.Pt, %struct.Pt }
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define double @foo(%struct.Rect* byval %my_r0) nounwind ssp !dbg !1 {
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entry:
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%retval = alloca double ; <double*> [#uses=2]
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%0 = alloca double ; <double*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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call void @llvm.dbg.declare(metadata %struct.Rect* %my_r0, metadata !0, metadata !DIExpression()), !dbg !15
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%1 = getelementptr inbounds %struct.Rect, %struct.Rect* %my_r0, i32 0, i32 0, !dbg !16 ; <%struct.Pt*> [#uses=1]
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%2 = getelementptr inbounds %struct.Pt, %struct.Pt* %1, i32 0, i32 0, !dbg !16 ; <double*> [#uses=1]
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%3 = load double, double* %2, align 8, !dbg !16 ; <double> [#uses=1]
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store double %3, double* %0, align 8, !dbg !16
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%4 = load double, double* %0, align 8, !dbg !16 ; <double> [#uses=1]
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store double %4, double* %retval, align 8, !dbg !16
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br label %return, !dbg !16
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return: ; preds = %entry
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%retval1 = load double, double* %retval, !dbg !16 ; <double> [#uses=1]
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ret double %retval1, !dbg !16
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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 = !{!21}
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!0 = !DILocalVariable(name: "my_r0", line: 11, arg: 1, scope: !1, file: !2, type: !7)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, file: !19, scope: !2, type: !4)
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!2 = !DIFile(filename: "b2.c", directory: "/tmp/")
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!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: FullDebug, file: !19, enums: !20, retainedTypes: !20, imports: null)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6, !7}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!7 = !DICompositeType(tag: DW_TAG_structure_type, name: "Rect", line: 6, size: 256, align: 64, file: !19, scope: !2, elements: !8)
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!8 = !{!9, !14}
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "P1", line: 7, size: 128, align: 64, file: !19, scope: !7, baseType: !10)
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!10 = !DICompositeType(tag: DW_TAG_structure_type, name: "Pt", line: 1, size: 128, align: 64, file: !19, scope: !2, elements: !11)
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!11 = !{!12, !13}
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "x", line: 2, size: 64, align: 64, file: !19, scope: !10, baseType: !6)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "y", line: 3, size: 64, align: 64, offset: 64, file: !19, scope: !10, baseType: !6)
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "P2", line: 8, size: 128, align: 64, offset: 128, file: !19, scope: !7, baseType: !10)
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!15 = !DILocation(line: 11, scope: !1)
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!16 = !DILocation(line: 12, scope: !17)
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!17 = distinct !DILexicalBlock(line: 11, column: 0, file: !19, scope: !1)
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!19 = !DIFile(filename: "b2.c", directory: "/tmp/")
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!20 = !{}
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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