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5b721561aa
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
31 lines
1.5 KiB
LLVM
31 lines
1.5 KiB
LLVM
; RUN: llc -o /dev/null < %s
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; PR7662
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; Do not add variables to !11 because it is a declaration entry.
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define i32 @bar() nounwind readnone ssp !dbg !0 {
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entry:
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ret i32 42, !dbg !9
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!15}
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!llvm.dbg.sp = !{!0, !6, !11}
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!llvm.dbg.lv.foo = !{!7}
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!0 = distinct !DISubprogram(name: "bar", linkageName: "bar", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, file: !12, scope: !1, type: !3)
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!1 = !DIFile(filename: "one.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 2.8", isOptimized: true, emissionKind: 0, file: !12, enums: !14, retainedTypes: !14, subprograms: !13)
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 7, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, file: !12, scope: !1, type: !3)
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!7 = !DILocalVariable(name: "one", line: 8, scope: !8, file: !1, type: !5)
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!8 = distinct !DILexicalBlock(line: 7, column: 18, file: !12, scope: !6)
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!9 = !DILocation(line: 4, column: 3, scope: !10)
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!10 = distinct !DILexicalBlock(line: 3, column: 11, file: !12, scope: !0)
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!11 = !DISubprogram(name: "foo", linkageName: "foo", line: 7, isLocal: true, isDefinition: false, virtualIndex: 6, isOptimized: true, file: !12, scope: !1, type: !3)
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!12 = !DIFile(filename: "one.c", directory: "/private/tmp")
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!13 = !{!0}
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!14 = !{}
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!15 = !{i32 1, !"Debug Info Version", i32 3}
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