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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 llvm-svn: 252219
36 lines
1.7 KiB
LLVM
36 lines
1.7 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}
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!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9}
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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)
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!7 = distinct !DISubprogram()
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; CHECK: !8 = !DISubprogram(scope: null, isLocal: false, isDefinition: false, isOptimized: false)
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!8 = !DISubprogram(isDefinition: false)
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; CHECK: !9 = 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, templateParams: !5, declaration: !8, variables: !6)
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!9 = 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, containingType: !4,
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virtuality: DW_VIRTUALITY_pure_virtual, virtualIndex: 10,
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flags: DIFlagPrototyped, isOptimized: true,
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templateParams: !5, declaration: !8, variables: !6)
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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!llvm.module.flags = !{!10}
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