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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
53 lines
2.8 KiB
LLVM
53 lines
2.8 KiB
LLVM
; RUN: opt -loop-idiom < %s -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10.0.0"
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define void @foo(double* nocapture %a) nounwind ssp !dbg !0 {
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entry:
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tail call void @llvm.dbg.value(metadata double* %a, i64 0, metadata !5, metadata !DIExpression()), !dbg !8
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !10, metadata !DIExpression()), !dbg !14
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.body ]
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%arrayidx = getelementptr double, double* %a, i64 %indvar
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; CHECK: call void @llvm.memset{{.+}} !dbg
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store double 0.000000e+00, double* %arrayidx, align 8, !dbg !15
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%indvar.next = add i64 %indvar, 1
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%exitcond = icmp ne i64 %indvar.next, 1000
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br i1 %exitcond, label %for.body, label %for.end, !dbg !14
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for.end: ; preds = %for.body
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tail call void @llvm.dbg.value(metadata !{null}, i64 0, metadata !10, metadata !DIExpression()), !dbg !16
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ret void, !dbg !17
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.module.flags = !{!19}
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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: !18, scope: !1, type: !3)
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!1 = !DIFile(filename: "li.c", directory: "/private/tmp")
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 127165:127174)", isOptimized: true, emissionKind: FullDebug, file: !18, enums: !9, retainedTypes: !9)
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!3 = !DISubroutineType(types: !4)
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!4 = !{null}
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!5 = !DILocalVariable(name: "a", line: 2, arg: 1, scope: !0, file: !1, type: !6)
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!6 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, scope: !2, baseType: !7)
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!8 = !DILocation(line: 2, column: 18, scope: !0)
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!9 = !{}
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!10 = !DILocalVariable(name: "i", line: 3, scope: !11, file: !1, type: !13)
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!11 = distinct !DILexicalBlock(line: 3, column: 3, file: !18, scope: !12)
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!12 = distinct !DILexicalBlock(line: 2, column: 21, file: !18, scope: !0)
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!13 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!14 = !DILocation(line: 3, column: 3, scope: !12)
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!15 = !DILocation(line: 4, column: 5, scope: !11)
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!16 = !DILocation(line: 3, column: 29, scope: !11)
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!17 = !DILocation(line: 5, column: 1, scope: !12)
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!18 = !DIFile(filename: "li.c", directory: "/private/tmp")
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!19 = !{i32 1, !"Debug Info Version", i32 3}
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