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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
24 lines
930 B
LLVM
24 lines
930 B
LLVM
; RUN: llc -mtriple x86_64-pc-linux-gnu < %s | FileCheck %s
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; CHECK: .long .Lline_table_start0 # DW_AT_stmt_list
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; CHECK: .section .debug_line,"",@progbits
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; CHECK-NEXT: .Lline_table_start0:
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define void @f() !dbg !0 {
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entry:
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ret void
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7}
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!5 = !{!0}
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!0 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 1, file: !6, scope: !1, type: !3)
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!1 = !DIFile(filename: "test2.c", directory: "/home/espindola/llvm")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: 0, file: !6, enums: !{}, retainedTypes: !{}, subprograms: !5)
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!6 = !DIFile(filename: "test2.c", directory: "/home/espindola/llvm")
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!7 = !{i32 1, !"Debug Info Version", i32 3}
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