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llvm-project/llvm/test/DebugInfo/ARM/big-endian-bitfield.ll

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Debug Info: Don't emit bitfields in the DWARF4 format when tuning for GDB. As discovered in PR27758, GDB does not fully support the DWARF 4 format. This patch ensures we always emit bitfields in the DWARF 2 when tuning for GDB. llvm-svn: 269827
2016-05-18 04:12:08 +08:00
; RUN: llc -O0 -filetype=obj -mtriple=armeb-none-freebsd -debugger-tune=lldb %s -o - \
Debug info: Support DWARF4 bitfields via DW_AT_data_bit_offset. The DWARF2 specification of DW_AT_bit_offset was written from the perspective of a big-endian machine with unclear semantics for other systems. DWARF4 deprecated DW_AT_bit_offset and introduced a new attribute DW_AT_data_bit_offset that simply counts the number of bits from the beginning of the containing entity regardless of endianness. After this patch LLVM emits DW_AT_bit_offset for DWARF 2 or 3 and DW_AT_data_bit_offset when DWARF 4 or later is requested. llvm-svn: 267895
2016-04-28 23:37:48 +08:00
; RUN: | llvm-dwarfdump --debug-dump=info - | FileCheck %s
; Generated from:
; struct S {
; int j:5;
; int k:6;
; int m:5;
; int n:8;
; } s;
target datalayout = "E-m:e-p:32:32-i64:64-v128:64:128-n32-S64"
%struct.S = type { i24 }
@s = common global %struct.S zeroinitializer, align 4
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12, !13, !14}
!llvm.ident = !{!15}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 267633)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
!1 = !DIFile(filename: "bitfield.c", directory: "/Volumes/Data/llvm")
!2 = !{}
!3 = !{!4}
!4 = distinct !DIGlobalVariable(name: "s", scope: !0, file: !1, line: 6, type: !5, isLocal: false, isDefinition: true, variable: %struct.S* @s)
!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 1, size: 32, align: 32, elements: !6)
!6 = !{!7, !9, !10, !11}
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"j"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_data_bit_offset [DW_FORM_data1] (0x00)
!7 = !DIDerivedType(tag: DW_TAG_member, name: "j", scope: !5, file: !1, line: 2, baseType: !8, size: 5, align: 32)
!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"k"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_data_bit_offset [DW_FORM_data1] (0x05)
!9 = !DIDerivedType(tag: DW_TAG_member, name: "k", scope: !5, file: !1, line: 3, baseType: !8, size: 6, align: 32, offset: 5)
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"m"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_data_bit_offset [DW_FORM_data1] (0x0b)
!10 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !5, file: !1, line: 4, baseType: !8, size: 5, align: 32, offset: 11)
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"n"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_data_bit_offset [DW_FORM_data1] (0x10)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "n", scope: !5, file: !1, line: 5, baseType: !8, size: 8, align: 32, offset: 16)
!12 = !{i32 2, !"Dwarf Version", i32 4}
!13 = !{i32 2, !"Debug Info Version", i32 3}
!14 = !{i32 1, !"PIC Level", i32 2}
!15 = !{!"clang version 3.9.0 (trunk 267633)"}