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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
28 lines
1.0 KiB
LLVM
28 lines
1.0 KiB
LLVM
; RUN: echo '!9 = !{!"%/T/linkagename.ll", !0}' > %t1
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; RUN: cat %s %t1 > %t2
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; RUN: opt -insert-gcov-profiling -disable-output < %t2
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; RUN: grep _Z3foov %T/linkagename.gcno
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; RUN: rm %T/linkagename.gcno
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define void @_Z3foov() !dbg !5 {
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entry:
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ret void, !dbg !8
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10}
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!llvm.gcov = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 177323)", isOptimized: false, emissionKind: 0, file: !2, enums: !3, retainedTypes: !3, subprograms: !4, globals: !3, imports: !3)
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!1 = !DIFile(filename: "hello.cc", directory: "/home/nlewycky")
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!2 = !DIFile(filename: "hello.cc", directory: "/home/nlewycky")
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!3 = !{}
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!4 = !{!5}
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!5 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !1, type: !6, variables: !3)
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !DILocation(line: 1, scope: !5)
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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