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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
28 lines
1.4 KiB
LLVM
28 lines
1.4 KiB
LLVM
%struct.Class = type { i8 }
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define weak_odr i32 @_ZN5ClassIiE3fooEv(%struct.Class* %this) align 2 !dbg !4 {
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entry:
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%this.addr = alloca %struct.Class*, align 8
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store %struct.Class* %this, %struct.Class** %this.addr, align 8
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%this1 = load %struct.Class*, %struct.Class** %this.addr
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ret i32 0, !dbg !12
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 224193) (llvm/trunk 224197)", isOptimized: false, emissionKind: 2, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "t2.cpp", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d2")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !5, scope: !6, type: !7, variables: !2)
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!5 = !DIFile(filename: "../t.h", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d2")
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!6 = !DIFile(filename: "../t.h", directory: "/Users/dexonsmith/data/llvm/staging/test/Linker/repro/d2")
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!7 = !DISubroutineType(types: !2)
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!8 = !{i32 2, !"Dwarf Version", i32 2}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"PIC Level", i32 2}
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!11 = !{!"clang version 3.6.0 (trunk 224193) (llvm/trunk 224197)"}
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!12 = !DILocation(line: 2, column: 15, scope: !4)
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