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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
47 lines
2.6 KiB
LLVM
47 lines
2.6 KiB
LLVM
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/inline-combine.prof -S | FileCheck %s
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%"class.llvm::FoldingSetNodeID" = type { %"class.llvm::SmallVector" }
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%"class.llvm::SmallVector" = type { %"class.llvm::SmallVectorImpl.base", %"struct.llvm::SmallVectorStorage" }
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%"class.llvm::SmallVectorImpl.base" = type { %"class.llvm::SmallVectorTemplateBase.base" }
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%"class.llvm::SmallVectorTemplateBase.base" = type { %"class.llvm::SmallVectorTemplateCommon.base" }
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%"class.llvm::SmallVectorTemplateCommon.base" = type <{ %"class.llvm::SmallVectorBase", %"struct.llvm::AlignedCharArrayUnion" }>
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%"class.llvm::SmallVectorBase" = type { i8*, i8*, i8* }
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%"struct.llvm::AlignedCharArrayUnion" = type { %"struct.llvm::AlignedCharArray" }
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%"struct.llvm::AlignedCharArray" = type { [4 x i8] }
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%"struct.llvm::SmallVectorStorage" = type { [31 x %"struct.llvm::AlignedCharArrayUnion"] }
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%"class.llvm::SmallVectorImpl" = type { %"class.llvm::SmallVectorTemplateBase.base", [4 x i8] }
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$foo = comdat any
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$bar = comdat any
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define void @foo(%"class.llvm::FoldingSetNodeID"* %this) comdat align 2 !dbg !3 {
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%1 = alloca %"class.llvm::FoldingSetNodeID"*, align 8
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store %"class.llvm::FoldingSetNodeID"* %this, %"class.llvm::FoldingSetNodeID"** %1, align 8
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%2 = load %"class.llvm::FoldingSetNodeID"*, %"class.llvm::FoldingSetNodeID"** %1, align 8
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%3 = getelementptr inbounds %"class.llvm::FoldingSetNodeID", %"class.llvm::FoldingSetNodeID"* %2, i32 0, i32 0
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; the call should have been inlined after sample-profile pass
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; CHECK-NOT: call
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call void bitcast (void (%"class.llvm::SmallVectorImpl"*)* @bar to void (%"class.llvm::SmallVector"*)*)(%"class.llvm::SmallVector"* %3), !dbg !7
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ret void
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}
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define void @bar(%"class.llvm::SmallVectorImpl"* %this) comdat align 2 !dbg !8 {
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ret void
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}
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!2}
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!llvm.dbg.cu = !{!9}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 1, !"Debug Info Version", i32 3}
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!2 = !{!"clang version 3.5 "}
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!3 = distinct !DISubprogram(name: "foo", scope: !4, file: !4, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !9, variables: !6)
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!4 = !DIFile(filename: "test.cc", directory: ".")
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!5 = !DISubroutineType(types: !6)
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!6 = !{}
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!7 = !DILocation(line: 4, scope: !3)
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!8 = distinct !DISubprogram(name: "bar", scope: !4, file: !4, line: 7, type: !5, isLocal: false, isDefinition: true, scopeLine: 7, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !9, variables: !6)
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!9 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !4)
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