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5b721561aa
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
42 lines
2.0 KiB
LLVM
42 lines
2.0 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t -filetype=obj -O0
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_rvalue_reference_type
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@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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define void @_Z3fooOi(i32* %i) uwtable ssp !dbg !5 {
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entry:
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%i.addr = alloca i32*, align 8
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store i32* %i, i32** %i.addr, align 8
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call void @llvm.dbg.declare(metadata i32** %i.addr, metadata !11, metadata !DIExpression()), !dbg !12
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%0 = load i32*, i32** %i.addr, align 8, !dbg !13
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%1 = load i32, i32* %0, align 4, !dbg !13
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%call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), i32 %1), !dbg !13
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ret void, !dbg !15
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare i32 @printf(i8*, ...)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.2 (trunk 157054) (llvm/trunk 157060)", isOptimized: false, emissionKind: 0, file: !16, enums: !1, retainedTypes: !1, subprograms: !3, globals: !1, imports: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooOi", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 5, file: !16, scope: !6, type: !7, variables: !1)
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!6 = !DIFile(filename: "foo.cpp", directory: "/Users/echristo/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: !10)
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!10 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "i", line: 4, arg: 1, scope: !5, file: !6, type: !9)
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!12 = !DILocation(line: 4, column: 17, scope: !5)
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!13 = !DILocation(line: 6, column: 3, scope: !14)
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!14 = distinct !DILexicalBlock(line: 5, column: 1, file: !16, scope: !5)
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!15 = !DILocation(line: 7, column: 1, scope: !14)
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!16 = !DIFile(filename: "foo.cpp", directory: "/Users/echristo/tmp")
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!17 = !{i32 1, !"Debug Info Version", i32 3}
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