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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
25 lines
1.2 KiB
LLVM
25 lines
1.2 KiB
LLVM
; RUN: opt -strip-dead-debug-info -disable-output < %s
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define i32 @foo() nounwind ssp !dbg !0 {
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entry:
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ret i32 0, !dbg !8
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!14}
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!0 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !10, scope: !1, type: !3)
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!1 = !DIFile(filename: "/tmp/a.c", directory: "/Volumes/Lalgate/clean/D.CW")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.8 (trunk 112062)", isOptimized: true, emissionKind: 1, file: !10, enums: !11, retainedTypes: !11, subprograms: !12, globals: !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 = !DIGlobalVariable(name: "i", linkageName: "i", line: 2, isLocal: true, isDefinition: true, scope: !1, file: !1, type: !7)
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!7 = !DIDerivedType(tag: DW_TAG_const_type, file: !10, scope: !1, baseType: !5)
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!8 = !DILocation(line: 3, column: 13, scope: !9)
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!9 = distinct !DILexicalBlock(line: 3, column: 11, file: !10, scope: !0)
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!10 = !DIFile(filename: "/tmp/a.c", directory: "/Volumes/Lalgate/clean/D.CW")
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!11 = !{}
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!12 = !{!0}
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!13 = !{!6}
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!14 = !{i32 1, !"Debug Info Version", i32 3}
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