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fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
41 lines
2.0 KiB
LLVM
41 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: FullDebug, file: !16, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooOi", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, 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, size: 64, align: 64, 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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