75819aedf6
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
2.3 KiB
LLVM
41 lines
2.3 KiB
LLVM
; RUN: opt %s -sample-profile -sample-profile-file=%S/Inputs/inline-hint.prof -pass-remarks=sample-profile -o /dev/null 2>&1 | FileCheck %s
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;
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; CHECK: Applied cold hint to globally cold function '_Z7cold_fnRxi' with 0.1
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define void @_Z7cold_fnRxi() !dbg !4 {
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entry:
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ret void, !dbg !29
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}
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; CHECK: Applied inline hint to globally hot function '_Z6hot_fnRxi' with 70.0
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define void @_Z6hot_fnRxi() #0 !dbg !10 {
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entry:
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ret void, !dbg !38
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}
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!llvm.module.flags = !{!17, !18}
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!llvm.ident = !{!19}
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!llvm.dbg.cu = !{!0}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !1)
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!1 = !DIFile(filename: "inline-hint.cc", directory: ".")
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!2 = !{}
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!3 = !{!4, !10, !11, !14}
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!4 = distinct !DISubprogram(name: "cold_fn", linkageName: "_Z7cold_fnRxi", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null, !7, !9}
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!7 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !8, size: 64, align: 64)
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!8 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = distinct !DISubprogram(name: "hot_fn", linkageName: "_Z6hot_fnRxi", scope: !1, file: !1, line: 7, type: !5, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!11 = distinct !DISubprogram(name: "compute", linkageName: "_Z7computex", scope: !1, file: !1, line: 11, type: !12, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!12 = !DISubroutineType(types: !13)
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!13 = !{!8, !8}
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!14 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 21, type: !15, isLocal: false, isDefinition: true, scopeLine: 21, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!9}
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!17 = !{i32 2, !"Dwarf Version", i32 4}
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!18 = !{i32 2, !"Debug Info Version", i32 3}
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!19 = !{!"clang version 3.8.0 (trunk 254067) (llvm/trunk 254079)"}
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!29 = !DILocation(line: 5, column: 1, scope: !4)
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!38 = !DILocation(line: 9, column: 1, scope: !10)
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