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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
51 lines
2.6 KiB
LLVM
51 lines
2.6 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj %s -o - | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Ensure that pointer constants are emitted as unsigned data. Alternatively,
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; these could be signless data (dataN).
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; Built with Clang from:
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; template <void *V, void (*F)(), int i>
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; void func() {}
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; template void func<nullptr, nullptr, 42>();
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_TAG_template_value_parameter
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; CHECK: DW_AT_name {{.*}} "V"
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; CHECK: DW_AT_const_value [DW_FORM_udata] (0)
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; CHECK: DW_TAG_template_value_parameter
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; CHECK: DW_AT_name {{.*}} "F"
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; CHECK: DW_AT_const_value [DW_FORM_udata] (0)
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; Function Attrs: nounwind uwtable
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define weak_odr void @_Z4funcILPv0ELPFvvE0ELi42EEvv() #0 !dbg !4 {
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entry:
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ret void, !dbg !18
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "constant-pointers.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "func<nullptr, nullptr, 42>", linkageName: "_Z4funcILPv0ELPFvvE0ELi42EEvv", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, templateParams: !8, variables: !2)
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!5 = !DIFile(filename: "constant-pointers.cpp", directory: "/tmp/dbginfo")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{!9, !11, !13}
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!9 = !DITemplateValueParameter(tag: DW_TAG_template_value_parameter, name: "V", type: !10, value: i8 0)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null)
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!11 = !DITemplateValueParameter(tag: DW_TAG_template_value_parameter, name: "F", type: !12, value: i8 0)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !6)
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!13 = !DITemplateValueParameter(tag: DW_TAG_template_value_parameter, name: "i", type: !14, value: i32 42)
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!14 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !{i32 2, !"Debug Info Version", i32 3}
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!17 = !{!"clang version 3.5.0 "}
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!18 = !DILocation(line: 3, scope: !4)
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