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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
45 lines
2.8 KiB
LLVM
45 lines
2.8 KiB
LLVM
; RUN: llc < %s -mtriple=arm64-apple-darwin
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; rdar://9146594
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define void @drt_vsprintf() nounwind ssp {
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entry:
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%do_tab_convert = alloca i32, align 4
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br i1 undef, label %if.then24, label %if.else295, !dbg !13
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if.then24: ; preds = %entry
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unreachable
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if.else295: ; preds = %entry
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call void @llvm.dbg.declare(metadata i32* %do_tab_convert, metadata !16, metadata !DIExpression()), !dbg !18
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store i32 0, i32* %do_tab_convert, align 4, !dbg !19
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unreachable
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!0}
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!0 = !DIGlobalVariable(name: "vsplive", line: 617, isLocal: true, isDefinition: true, scope: !1, file: !2, type: !6)
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!1 = distinct !DISubprogram(name: "drt_vsprintf", line: 616, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, file: !20, scope: !2, type: !4)
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!2 = !DIFile(filename: "print.i", directory: "/Volumes/Ebi/echeng/radars/r9146594")
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 (http://llvm.org/git/clang.git git:/git/puzzlebox/clang.git/ c4d1aea01c4444eb81bdbf391f1be309127c3cf1)", isOptimized: true, emissionKind: FullDebug, file: !20, enums: !21, retainedTypes: !21, globals: !{!0})
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = distinct !DISubprogram(name: "putc_mem", line: 30, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, file: !20, scope: !2, type: !8)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = distinct !DISubprogram(name: "print_double", line: 203, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, file: !20, scope: !2, type: !4)
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!11 = distinct !DISubprogram(name: "print_number", line: 75, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, file: !20, scope: !2, type: !4)
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!12 = distinct !DISubprogram(name: "get_flags", line: 508, isLocal: true, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, file: !20, scope: !2, type: !8)
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!13 = !DILocation(line: 653, column: 5, scope: !14)
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!14 = distinct !DILexicalBlock(line: 652, column: 35, file: !20, scope: !15)
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!15 = distinct !DILexicalBlock(line: 616, column: 1, file: !20, scope: !1)
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!16 = !DILocalVariable(name: "do_tab_convert", line: 853, scope: !17, file: !2, type: !6)
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!17 = distinct !DILexicalBlock(line: 850, column: 12, file: !20, scope: !14)
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!18 = !DILocation(line: 853, column: 11, scope: !17)
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!19 = !DILocation(line: 853, column: 29, scope: !17)
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!20 = !DIFile(filename: "print.i", directory: "/Volumes/Ebi/echeng/radars/r9146594")
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!21 = !{i32 0}
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