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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
56 lines
2.6 KiB
LLVM
56 lines
2.6 KiB
LLVM
; RUN: opt -simplifycfg -S < %s | FileCheck %s
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define i32 @foo(i32 %i) nounwind ssp !dbg !0 {
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call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !6, metadata !DIExpression()), !dbg !7
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call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !9, metadata !DIExpression()), !dbg !11
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%1 = icmp ne i32 %i, 0, !dbg !12
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;CHECK: call i32 (...) @bar()
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;CHECK-NEXT: llvm.dbg.value
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br i1 %1, label %2, label %4, !dbg !12
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; <label>:2 ; preds = %0
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%3 = call i32 (...) @bar(), !dbg !13
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call void @llvm.dbg.value(metadata i32 %3, i64 0, metadata !9, metadata !DIExpression()), !dbg !13
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br label %6, !dbg !15
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; <label>:4 ; preds = %0
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%5 = call i32 (...) @bar(), !dbg !16
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call void @llvm.dbg.value(metadata i32 %5, i64 0, metadata !9, metadata !DIExpression()), !dbg !16
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br label %6, !dbg !18
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; <label>:6 ; preds = %4, %2
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%k.0 = phi i32 [ %3, %2 ], [ %5, %4 ]
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ret i32 %k.0, !dbg !19
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare i32 @bar(...)
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.module.flags = !{!21}
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!llvm.dbg.cu = !{!2}
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!0 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !20, scope: !1, type: !3)
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!1 = !DIFile(filename: "b.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !20)
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!3 = !DISubroutineType(types: !4)
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!4 = !{!5}
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!5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = !DILocalVariable(name: "i", line: 2, arg: 1, scope: !0, file: !1, type: !5)
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!7 = !DILocation(line: 2, column: 13, scope: !0)
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!9 = !DILocalVariable(name: "k", line: 3, scope: !10, file: !1, type: !5)
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!10 = distinct !DILexicalBlock(line: 2, column: 16, file: !20, scope: !0)
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!11 = !DILocation(line: 3, column: 12, scope: !10)
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!12 = !DILocation(line: 4, column: 3, scope: !10)
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!13 = !DILocation(line: 5, column: 5, scope: !14)
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!14 = distinct !DILexicalBlock(line: 4, column: 10, file: !20, scope: !10)
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!15 = !DILocation(line: 6, column: 3, scope: !14)
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!16 = !DILocation(line: 7, column: 5, scope: !17)
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!17 = distinct !DILexicalBlock(line: 6, column: 10, file: !20, scope: !10)
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!18 = !DILocation(line: 8, column: 3, scope: !17)
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!19 = !DILocation(line: 9, column: 3, scope: !10)
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!20 = !DIFile(filename: "b.c", directory: "/private/tmp")
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!21 = !{i32 1, !"Debug Info Version", i32 3}
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