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5f220beefc
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252219 91177308-0d34-0410-b5e6-96231b3b80d8
34 lines
1.5 KiB
LLVM
34 lines
1.5 KiB
LLVM
; This file is used by 2011-08-04-Metadata.ll, so it doesn't actually do anything itself
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;
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; RUN: true
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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@x = internal global i32 0, align 4
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define void @bar() nounwind uwtable ssp !dbg !1 {
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entry:
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store i32 1, i32* @x, align 4, !dbg !7
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ret void, !dbg !7
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11}
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!llvm.dbg.sp = !{!1}
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!llvm.dbg.gv = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: 0, file: !9, enums: !{}, retainedTypes: !{}, subprograms: !10)
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!1 = distinct !DISubprogram(name: "bar", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !9, scope: !2, type: !3)
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!2 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DIGlobalVariable(name: "x", line: 1, isLocal: true, isDefinition: true, scope: !0, file: !2, type: !6, variable: i32* @x)
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 2, column: 14, scope: !8)
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!8 = distinct !DILexicalBlock(line: 2, column: 12, file: !9, scope: !1)
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!9 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
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!10 = !{!1}
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!11 = !{i32 1, !"Debug Info Version", i32 3}
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