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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
61 lines
2.7 KiB
LLVM
61 lines
2.7 KiB
LLVM
; RUN: llc -generate-arange-section < %s | FileCheck %s
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; CHECK: .section .debug_aranges,"",@progbits
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; First CU
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; CHECK-NEXT: .long 44 # Length of ARange Set
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; CHECK-NEXT: .short 2 # DWARF Arange version number
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; CHECK-NEXT: .long .Lcu_begin0 # Offset Into Debug Info Section
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; CHECK-NEXT: .byte 8 # Address Size (in bytes)
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; CHECK-NEXT: .byte 0 # Segment Size (in bytes)
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; CHECK-NEXT: .zero 4,255
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; CHECK-NEXT: .quad kittens
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; CHECK-NEXT: .quad rainbows-kittens
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; CHECK-NEXT: .quad 0 # ARange terminator
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; CHECK-NEXT: .quad 0
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; Second CU
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; CHECK-NEXT: .long 44 # Length of ARange Set
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; CHECK-NEXT: .short 2 # DWARF Arange version number
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; CHECK-NEXT: .long .Lcu_begin1 # Offset Into Debug Info Section
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; CHECK-NEXT: .byte 8 # Address Size (in bytes)
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; CHECK-NEXT: .byte 0 # Segment Size (in bytes)
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; CHECK-NEXT: .zero 4,255
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; CHECK-NEXT: .quad rainbows
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; CHECK-NEXT: .quad .Lsec_end0-rainbows
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; CHECK-NEXT: .quad 0 # ARange terminator
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; CHECK-NEXT: .quad 0
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; Generated from: clang -c -g -emit-llvm
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; llvm-link test1.bc test2.bc -o test.bc
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; test1.c: int kittens = 4;
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; test2.c: int rainbows = 5;
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; ModuleID = 'test.bc'
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target triple = "x86_64-unknown-linux-gnu"
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@kittens = global i32 4, align 4
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@rainbows = global i32 5, align 4
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!llvm.dbg.cu = !{!0, !7}
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!llvm.module.flags = !{!12, !13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !3, imports: !2)
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!1 = !DIFile(filename: "test1.c", directory: "/home/kayamon")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIGlobalVariable(name: "kittens", line: 1, isLocal: false, isDefinition: true, scope: null, file: !5, type: !6, variable: i32* @kittens)
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!5 = !DIFile(filename: "test1.c", directory: "/home/kayamon")
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 ", isOptimized: false, emissionKind: FullDebug, file: !8, enums: !2, retainedTypes: !2, globals: !9, imports: !2)
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!8 = !DIFile(filename: "test2.c", directory: "/home/kayamon")
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!9 = !{!10}
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!10 = !DIGlobalVariable(name: "rainbows", line: 1, isLocal: false, isDefinition: true, scope: null, file: !11, type: !6, variable: i32* @rainbows)
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!11 = !DIFile(filename: "test2.c", directory: "/home/kayamon")
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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