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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
60 lines
2.6 KiB
LLVM
60 lines
2.6 KiB
LLVM
; RUN: llc %s -filetype=obj -o - | llvm-dwarfdump --debug-dump=info - | FileCheck %s
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; CHECK: DW_TAG_variable
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; DW_OP_fbreg
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; CHECK-NEXT: DW_AT_location [DW_FORM_exprloc] (<0x2> 91 00 )
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; CHECK-NEXT: DW_AT_name {{.*}}"i"
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target datalayout = "e-m:e-p:32:32-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-darwin"
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; Function Attrs: nounwind uwtable
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declare i32 @foo(i32 %i) #0
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind uwtable
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define i32 @main() #0 !dbg !9 {
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entry:
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%retval = alloca i32, align 4
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%i = alloca i32, align 4
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store i32 0, i32* %retval
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call void @llvm.dbg.declare(metadata i32* %i, metadata !20, metadata !16), !dbg !21
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store i32 20, i32* %i, align 4, !dbg !21
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%0 = load i32, i32* %i, align 4, !dbg !22
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%call = call i32 @foo(i32 %0), !dbg !23
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ret i32 %call, !dbg !24
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}
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "x.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 2, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "x.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = distinct !DISubprogram(name: "main", line: 8, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 9, file: !1, scope: !5, type: !10, variables: !2)
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!10 = !DISubroutineType(types: !11)
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!11 = !{!8}
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{!"clang version 3.7.0"}
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!15 = !DILocalVariable(name: "i", line: 2, arg: 1, scope: !4, file: !5, type: !8)
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!16 = !DIExpression()
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!17 = !DILocation(line: 2, column: 10, scope: !4)
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!18 = !DILocation(line: 4, column: 10, scope: !4)
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!19 = !DILocation(line: 4, column: 3, scope: !4)
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!20 = !DILocalVariable(name: "i", line: 10, scope: !9, file: !5, type: !8)
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!21 = !DILocation(line: 10, column: 7, scope: !9)
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!22 = !DILocation(line: 11, column: 15, scope: !9)
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!23 = !DILocation(line: 11, column: 10, scope: !9)
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!24 = !DILocation(line: 11, column: 3, scope: !9)
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