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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
35 lines
1.5 KiB
LLVM
35 lines
1.5 KiB
LLVM
; RUN: opt -strip-debug < %s -S | FileCheck %s
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; CHECK-NOT: llvm.dbg
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@x = common global i32 0 ; <i32*> [#uses=0]
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define void @foo() nounwind readnone optsize ssp !dbg !0 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !5, metadata !{}), !dbg !10
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ret void, !dbg !11
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!13}
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!llvm.dbg.sp = !{!0}
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!llvm.dbg.lv.foo = !{!5}
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!llvm.dbg.gv = !{!8}
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!0 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, file: !12, scope: !1, type: !3)
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!1 = !DIFile(filename: "b.c", directory: "/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: true, emissionKind: 0, file: !12)
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DILocalVariable(name: "y", line: 3, scope: !6, file: !1, type: !7)
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!6 = distinct !DILexicalBlock(line: 2, column: 0, file: !12, scope: !0)
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIGlobalVariable(name: "x", line: 1, isLocal: false, isDefinition: true, scope: !1, file: !1, type: !7, variable: i32* @x)
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!9 = !{i32 0}
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!10 = !DILocation(line: 3, scope: !6)
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!11 = !DILocation(line: 4, scope: !6)
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!12 = !DIFile(filename: "b.c", directory: "/tmp")
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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