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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
35 lines
1.6 KiB
LLVM
35 lines
1.6 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s
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; CHECK: .section .debug_info
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; CHECK: DW_AT_const_value
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; CHECK-NEXT: 42
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define i128 @__foo(i128 %a, i128 %b) nounwind !dbg !3 {
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entry:
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tail call void @llvm.dbg.value(metadata i128 42 , i64 0, metadata !1, metadata !DIExpression()), !dbg !11
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%add = add i128 %a, %b, !dbg !11
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ret i128 %add, !dbg !11
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!5}
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!llvm.module.flags = !{!16}
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!0 = !{i128 42 }
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!1 = !DILocalVariable(name: "MAX", line: 29, scope: !2, file: !4, type: !8)
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!2 = distinct !DILexicalBlock(line: 26, column: 0, file: !13, scope: !3)
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!3 = distinct !DISubprogram(name: "__foo", linkageName: "__foo", line: 26, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !5, scopeLine: 26, file: !13, scope: !4, type: !6)
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!4 = !DIFile(filename: "foo.c", directory: "/tmp")
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!5 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "clang", isOptimized: true, emissionKind: FullDebug, file: !13, enums: !15, retainedTypes: !15, imports: null)
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8, !8}
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!8 = !DIDerivedType(tag: DW_TAG_typedef, name: "ti_int", line: 78, file: !14, scope: !4, baseType: !10)
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!9 = !DIFile(filename: "myint.h", directory: "/tmp")
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!10 = !DIBasicType(tag: DW_TAG_base_type, size: 128, align: 128, encoding: DW_ATE_signed)
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!11 = !DILocation(line: 29, scope: !2)
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!13 = !DIFile(filename: "foo.c", directory: "/tmp")
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!14 = !DIFile(filename: "myint.h", directory: "/tmp")
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!15 = !{}
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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