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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
31 lines
1.3 KiB
LLVM
31 lines
1.3 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux-gnu -O0 -filetype=obj -o %t %s
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; Generated from:
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; clang -g -S -emit-llvm -o foo.ll foo.c
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; typedef int v4si __attribute__((__vector_size__(16)));
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;
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; v4si a
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@a = common global <4 x i32> zeroinitializer, align 16
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 171825) (llvm/trunk 171822)", isOptimized: false, emissionKind: FullDebug, file: !12, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = !DIGlobalVariable(name: "a", line: 3, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7, variable: <4 x i32>* @a)
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!6 = !DIFile(filename: "foo.c", directory: "/Users/echristo")
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!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "v4si", line: 1, file: !12, baseType: !8)
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!8 = !DICompositeType(tag: DW_TAG_array_type, size: 128, align: 128, flags: DIFlagVector, baseType: !9, elements: !10)
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = !{!11}
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!11 = !DISubrange(count: 4)
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!12 = !DIFile(filename: "foo.c", directory: "/Users/echristo")
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; Check that we get an array type with a vector attribute.
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; CHECK: DW_TAG_array_type
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; CHECK-NEXT: DW_AT_GNU_vector
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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