llvm-mirror/test/Linker/2011-08-04-Metadata2.ll
Peter Collingbourne 5b721561aa DI: Reverse direction of subprogram -> function edge.
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
2015-11-05 22:03:56 +00:00

34 lines
1.5 KiB
LLVM

; This file is used by 2011-08-04-Metadata.ll, so it doesn't actually do anything itself
;
; RUN: true
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"
target triple = "x86_64-apple-macosx10.7.0"
@x = internal global i32 0, align 4
define void @bar() nounwind uwtable ssp !dbg !1 {
entry:
store i32 1, i32* @x, align 4, !dbg !7
ret void, !dbg !7
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!11}
!llvm.dbg.sp = !{!1}
!llvm.dbg.gv = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: 0, file: !9, enums: !{}, retainedTypes: !{}, subprograms: !10)
!1 = distinct !DISubprogram(name: "bar", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, file: !9, scope: !2, type: !3)
!2 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
!3 = !DISubroutineType(types: !4)
!4 = !{null}
!5 = !DIGlobalVariable(name: "x", line: 1, isLocal: true, isDefinition: true, scope: !0, file: !2, type: !6, variable: i32* @x)
!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!7 = !DILocation(line: 2, column: 14, scope: !8)
!8 = distinct !DILexicalBlock(line: 2, column: 12, file: !9, scope: !1)
!9 = !DIFile(filename: "/tmp/two.c", directory: "/Volumes/Lalgate/Slate/D")
!10 = !{!1}
!11 = !{i32 1, !"Debug Info Version", i32 3}