f89129af8a
In Ada, an array can be packed and the elements can take less space than their natural object size. For example, for this type: type Packed_Array is array (4 .. 8) of Boolean; pragma pack (Packed_Array); ... each element of the array occupies a single bit, even though the "natural" size for a Boolean in memory is a byte. In DWARF, this is represented by putting a DW_AT_bit_stride onto the array type itself. This patch adds a bit stride to DICompositeType so that gnat-llvm can emit DWARF for these sorts of arrays.
31 lines
1.6 KiB
LLVM
31 lines
1.6 KiB
LLVM
;; Test bit stride of arrays.
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; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
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; CHECK: !DICompositeType(tag: DW_TAG_array_type, baseType: !{{[0-9]+}}, size: 32, align: 32, elements: !{{[0-9]+}}, bitStride: i32 7)
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; ModuleID = 'stride.adb'
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source_filename = "/dir/stride.ll"
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!llvm.module.flags = !{!0, !1}
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!llvm.dbg.cu = !{!2}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = distinct !DICompileUnit(language: DW_LANG_Ada95, file: !3, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !5, globals: !4, imports: !4)
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!3 = !DIFile(filename: "stride.adb", directory: "/dir")
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!4 = !{}
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!5 = !{!6, !17}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 32, align: 32, elements: !8, dataLocation: !10, associated: !15)
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!7 = !DIBasicType(name: "integer", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DISubrange(count: 19, lowerBound: 2)
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!10 = distinct !DILocalVariable(scope: !11, file: !3, type: !14, flags: DIFlagArtificial)
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!11 = distinct !DISubprogram(name: "main", scope: !2, file: !3, line: 1, type: !12, scopeLine: 1, spFlags: DISPFlagDefinition | DISPFlagMainSubprogram, unit: !2)
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!12 = !DISubroutineType(cc: DW_CC_program, types: !13)
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!13 = !{null}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 32, align: 32)
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!15 = distinct !DILocalVariable(scope: !11, file: !3, type: !16, flags: DIFlagArtificial)
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!16 = !DIBasicType(name: "integer", size: 32, align: 32, encoding: DW_ATE_signed)
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!17 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 32, align: 32, elements: !8, bitStride: i32 7)
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