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e6c0e33913
if it is more specific than the one in its DW_AT_specification. If a static member is an array, the translation unit containing the member definition may have a more specific type (including its length) than TUs only seeing the class declaration. This patch adds a DW_AT_type to the member's DW_TAG_variable in addition to the DW_AT_specification in these cases. The member type in the DW_AT_specification still shows the more generic type (without the length) to avoid defeating type uniquing. The DWARF standard discourages “duplicating” a DW_AT_type in a member variable definition but doesn’t explicitly forbid it. Having the more specific type (with the array length) available is what allows the debugger to print the contents of a static array member variable. https://reviews.llvm.org/D26368 rdar://problem/28706946 llvm-svn: 286302
72 lines
2.9 KiB
LLVM
72 lines
2.9 KiB
LLVM
; RUN: %llc_dwarf %s -filetype=obj -o - | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Generated from:
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;
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; struct A {
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; static int fully_specified;
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; static int smem[];
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; };
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;
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; int A::fully_specified;
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; int A::smem[] = { 0, 1, 2, 3 };
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;
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_specification{{.*}}"fully_specified"
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; CHECK-NOT: DW_AT_type
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; CHECK: DW_TAG_structure_type
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; CHECK: DW_TAG_member
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; CHECK: DW_TAG_member
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; CHECK-NEXT: DW_AT_name {{.*}} "smem"
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; CHECK-NEXT: DW_AT_type {{.*}} {0x[[GENERIC:[0-9]+]]}
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;
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; CHECK: 0x[[GENERIC]]: DW_TAG_array_type
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; CHECK-NOT: DW_TAG
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_subrange_type
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; CHECK-NOT: DW_AT_count
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; CHECK: NULL
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;
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_specification {{.*}}"smem"
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; CHECK-NEXT: DW_AT_type {{.*}} {0x[[SPECIFIC:[0-9]+]]}
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;
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; CHECK: 0x[[SPECIFIC]]: DW_TAG_array_type
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; CHECK-NOT: DW_TAG
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_subrange_type
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; CHECK-NOT: DW_TAG
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; CHECK-NOT: NULL
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; CHECK: DW_AT_count {{.*}} (0x04)
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source_filename = "static_member_array.cpp"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.12.0"
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@_ZN1A15fully_specifiedE = global i32 0, align 4, !dbg !0
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@_ZN1A4smemE = global [4 x i32] [i32 0, i32 1, i32 2, i32 3], align 16, !dbg !5
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!17, !18, !19}
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!llvm.ident = !{!20}
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!0 = distinct !DIGlobalVariable(name: "fully_specified", linkageName: "_ZN1A15fully_specifiedE", scope: !1, file: !2, line: 7, type: !7, isLocal: false, isDefinition: true, declaration: !13)
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!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "clang version 4.0.0 (trunk 286129) (llvm/trunk 286128)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
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!2 = !DIFile(filename: "static_member_array.cpp", directory: "/Volumes/Data/radar/28706946")
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!3 = !{}
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!4 = !{!0, !5}
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!5 = distinct !DIGlobalVariable(name: "smem", linkageName: "_ZN1A4smemE", scope: !1, file: !2, line: 8, type: !6, isLocal: false, isDefinition: true, declaration: !10)
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 128, elements: !8)
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!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DISubrange(count: 4)
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!10 = !DIDerivedType(tag: DW_TAG_member, name: "smem", scope: !11, file: !2, line: 4, baseType: !14, flags: DIFlagStaticMember)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !2, line: 1, size: 8, elements: !12, identifier: "_ZTS1A")
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!12 = !{!13, !10}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "fully_specified", scope: !11, file: !2, line: 3, baseType: !7, flags: DIFlagStaticMember)
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!14 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, elements: !15)
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!15 = !{!16}
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!16 = !DISubrange(count: -1)
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!17 = !{i32 2, !"Dwarf Version", i32 4}
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!18 = !{i32 2, !"Debug Info Version", i32 3}
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!19 = !{i32 1, !"PIC Level", i32 2}
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!20 = !{!"clang version 4.0.0 (trunk 286129) (llvm/trunk 286128)"}
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