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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
32 lines
1.3 KiB
LLVM
32 lines
1.3 KiB
LLVM
; RUN: llc < %s -o /dev/null
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define void @bar(i32 %i) nounwind uwtable ssp !dbg !5 {
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entry:
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tail call void (...) @foo() nounwind, !dbg !14
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ret void, !dbg !16
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}
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declare void @foo(...)
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declare void @llvm.dbg.value(metadata, i64, 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_C99, producer: "clang version 3.0 (trunk 139632)", isOptimized: true, emissionKind: 0, file: !17, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = distinct !DISubprogram(name: "bar", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, file: !17, scope: !6, type: !7, variables: !9)
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!6 = !DIFile(filename: "cf.c", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!11}
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!11 = !DILocalVariable(name: "i", line: 3, arg: 1, scope: !5, file: !17, type: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !DILocation(line: 3, column: 14, scope: !5)
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!14 = !DILocation(line: 4, column: 3, scope: !15)
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!15 = distinct !DILexicalBlock(line: 3, column: 17, file: !17, scope: !5)
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!16 = !DILocation(line: 5, column: 1, scope: !15)
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!17 = !DIFile(filename: "cf.c", directory: "/private/tmp")
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!18 = !{i32 1, !"Debug Info Version", i32 3}
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