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5f220beefc
Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252219 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
2.0 KiB
LLVM
41 lines
2.0 KiB
LLVM
; RUN: llvm-link %s %p/2011-08-18-unique-class-type2.ll -S -o - | FileCheck %s
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; CHECK: DW_TAG_class_type
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; CHECK-NOT: DW_TAG_class_type
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; Test to check there is only one MDNode for class A after linking.
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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%"class.N1::A" = type { i8 }
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define void @_Z3fooN2N11AE() nounwind uwtable ssp !dbg !5 {
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entry:
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%mya = alloca %"class.N1::A", align 1
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call void @llvm.dbg.declare(metadata %"class.N1::A"* %mya, metadata !9, metadata !DIExpression()), !dbg !13
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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 = !{!0}
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!llvm.module.flags = !{!18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.0 (trunk 137954)", isOptimized: true, emissionKind: 0, file: !16, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2)
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!1 = !{!2}
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!2 = !{}
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!3 = !{!5}
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!5 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooN2N11AE", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, file: !16, scope: !6, type: !7)
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!6 = !DIFile(filename: "n1.c", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !DILocalVariable(name: "mya", line: 4, arg: 1, scope: !5, file: !6, type: !10)
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!10 = !DICompositeType(tag: DW_TAG_class_type, name: "A", line: 3, size: 8, align: 8, file: !17, scope: !11, elements: !2)
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!11 = !DINamespace(name: "N1", line: 2, file: !17, scope: null)
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!12 = !DIFile(filename: "./n.h", directory: "/private/tmp")
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!13 = !DILocation(line: 4, column: 12, scope: !5)
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!14 = !DILocation(line: 4, column: 18, scope: !15)
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!15 = distinct !DILexicalBlock(line: 4, column: 17, file: !16, scope: !5)
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!16 = !DIFile(filename: "n1.c", directory: "/private/tmp")
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!17 = !DIFile(filename: "./n.h", directory: "/private/tmp")
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!18 = !{i32 1, !"Debug Info Version", i32 3}
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