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llvm-project/llvm/test/DebugInfo/X86/bitfields-dwarf4.ll

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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: llc -mtriple x86_64-apple-macosx -O0 -filetype=obj -o - %s \
; RUN: | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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 -mtriple x86_64-gnu-linux -O0 -filetype=obj -o - %s \
; RUN: | llvm-dwarfdump -debug-dump=info - | FileCheck %s --check-prefix=LINUX
; LINUX-NOT: DW_AT_data_bit_offset
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
;
; Generated from:
; #include <stdint.h>
; #pragma pack(1)
; struct PackedBits
; {
; char a;
; uint32_t b : 5,
; c : 27
; } s;
; #pragma pack()
source_filename = "bitfield.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx"
%struct.PackedBits = type <{ i8, i32 }>
@s = common global %struct.PackedBits zeroinitializer, align 1
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!14, !15, !16}
!llvm.ident = !{!17}
!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: 8, type: !5, isLocal: false, isDefinition: true, variable: %struct.PackedBits* @s)
!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "PackedBits", file: !1, line: 3, size: 40, align: 8, elements: !6)
!6 = !{!7, !9, !13}
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"a"
; CHECK-NOT: DW_TAG
; CHECK-NOT: DW_AT_bit_offset
; CHECK-NOT: DW_AT_data_bit_offset
; CHECK: DW_AT_data_member_location [DW_FORM_data1] (0x00)
!7 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !5, file: !1, line: 5, baseType: !8, size: 8, align: 8)
!8 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"b"
; CHECK-NOT: DW_TAG
; CHECK-NOT: DW_AT_bit_offset
Debug info: Don't emit a DW_AT_byte_size when emitting a DWARF4 bit field. The DWARF spec clearly states that a bit field member should have either a DW_AT_byte_size or a DW_AT_bit_size, but not both. Also the DW_AT_byte_size is redundant with the size of the type of the member. This fixes a bug found in PR 27758. llvm-svn: 269714
2016-05-17 06:45:10 +08:00
; CHECK-NOT: DW_AT_byte_size
; CHECK: DW_AT_bit_size [DW_FORM_data1] (0x05)
; CHECK-NOT: DW_AT_byte_size
; CHECK-NEXT: DW_AT_data_bit_offset [DW_FORM_data1] (0x08)
Debug Info: Don't emit a DW_AT_data_member_location for DWARF bitfields. The DWARF spec states that a member entry may have either a DW_AT_data_member_location or a DW_AT_data_bit_offset, but not both. This fixes a bug found in PR 27758. llvm-svn: 269731
2016-05-17 10:37:53 +08:00
; CHECK-NOT: DW_AT_data_member_location
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
!9 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !5, file: !1, line: 6, baseType: !10, size: 5, align: 32, offset: 8)
!10 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint32_t", file: !11, line: 183, baseType: !12)
!11 = !DIFile(filename: "/Volumes/Data/llvm/_build.ninja.release/bin/../lib/clang/3.9.0/include/stdint.h", directory: "/Volumes/Data/llvm")
!12 = !DIBasicType(name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"c"
; CHECK-NOT: DW_TAG
; CHECK-NOT: DW_AT_bit_offset
Debug info: Don't emit a DW_AT_byte_size when emitting a DWARF4 bit field. The DWARF spec clearly states that a bit field member should have either a DW_AT_byte_size or a DW_AT_bit_size, but not both. Also the DW_AT_byte_size is redundant with the size of the type of the member. This fixes a bug found in PR 27758. llvm-svn: 269714
2016-05-17 06:45:10 +08:00
; CHECK-NOT: DW_AT_byte_size
; CHECK: DW_AT_bit_size [DW_FORM_data1] (0x1b)
; CHECK-NEXT: DW_AT_data_bit_offset [DW_FORM_data1] (0x0d)
Debug Info: Don't emit a DW_AT_data_member_location for DWARF bitfields. The DWARF spec states that a member entry may have either a DW_AT_data_member_location or a DW_AT_data_bit_offset, but not both. This fixes a bug found in PR 27758. llvm-svn: 269731
2016-05-17 10:37:53 +08:00
; CHECK-NOT: DW_AT_data_member_location
; CHECK: DW_TAG
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
!13 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !5, file: !1, line: 7, baseType: !10, size: 27, align: 32, offset: 13)
!14 = !{i32 2, !"Dwarf Version", i32 4}
!15 = !{i32 2, !"Debug Info Version", i32 3}
!16 = !{i32 1, !"PIC Level", i32 2}
!17 = !{!"clang version 3.9.0 (trunk 267633)"}