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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
40 lines
1.8 KiB
LLVM
40 lines
1.8 KiB
LLVM
; RUN: llc -mtriple=aarch64-non-linux-gnu -dwarf-version=4 < %s -filetype=obj \
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; RUN: | llvm-dwarfdump - | FileCheck -check-prefix=CHECK -check-prefix=CHECK-4 %s
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; RUN: llc -mtriple=aarch64-non-linux-gnu -dwarf-version=3 < %s -filetype=obj \
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; RUN: | llvm-dwarfdump - | FileCheck -check-prefix=CHECK -check-prefix=CHECK-3 %s
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; We're mostly checking that relocations are applied correctly
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; here. Currently R_AARCH64_ABS32 is used for references to debug data
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; and R_AARCH64_ABS64 is used for program addresses.
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; A couple of ABS32s, both at 0 and elsewhere, interpreted correctly:
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; CHECK: DW_AT_producer [DW_FORM_strp] ( .debug_str[0x00000000] = "clang version 3.3 ")
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; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000013] = "tmp.c")
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; A couple of ABS64s similarly:
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; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
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; CHECK-4: DW_AT_high_pc [DW_FORM_data4] (0x00000008)
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; CHECK-3: DW_AT_high_pc [DW_FORM_addr] (0x0000000000000008)
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define i32 @main() nounwind !dbg !3 {
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ret i32 0, !dbg !8
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}
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attributes #0 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !9, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!3 = distinct !DISubprogram(name: "main", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 1, file: !9, scope: !4, type: !5, variables: !1)
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!4 = !DIFile(filename: "tmp.c", directory: "/home/tim/llvm/build")
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DILocation(line: 2, scope: !3)
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!9 = !DIFile(filename: "tmp.c", directory: "/home/tim/llvm/build")
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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