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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
41 lines
1.9 KiB
LLVM
41 lines
1.9 KiB
LLVM
; REQUIRES: object-emission
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; XFAIL: hexagon
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; RUN: %llc_dwarf -filetype=obj -O0 < %s > %t
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_ptr_to_member_type
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; CHECK: DW_TAG_ptr_to_member_type
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + {{.*}} => {[[TYPE:0x[0-9a-f]+]]})
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; CHECK: [[TYPE]]: DW_TAG_subroutine_type
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NEXT: DW_AT_type
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; CHECK-NEXT: DW_AT_artificial [DW_FORM_flag
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; IR generated from clang -g with the following source:
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; struct S {
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; };
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;
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; int S::*x = 0;
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; void (S::*y)(int) = 0;
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@x = global i64 -1, align 8
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@y = global { i64, i64 } zeroinitializer, align 8
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !15, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5, !10}
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!5 = !DIGlobalVariable(name: "x", line: 4, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: i64* @x)
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!6 = !DIFile(filename: "simple.cpp", directory: "/home/blaikie/Development/scratch")
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!7 = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !8, extraData: !9)
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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 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", line: 1, size: 8, align: 8, file: !15, elements: !1)
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!10 = !DIGlobalVariable(name: "y", line: 5, isLocal: false, isDefinition: true, scope: null, file: !6, type: !11, variable: { i64, i64 }* @y)
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!11 = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !12, extraData: !9)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !8}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !9)
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!15 = !DIFile(filename: "simple.cpp", directory: "/home/blaikie/Development/scratch")
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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