From 5332e4251c63263eb9942d91b1d348368b8308b8 Mon Sep 17 00:00:00 2001 From: Adrian Prantl Date: Thu, 25 Jun 2015 23:19:19 +0000 Subject: [PATCH] Debug Info: Add basic test coverage for the DWARF encoding of bitfields. While looking at a couple of bugs in the debug info output for bitfields I noticed that there wasn't a single regression test to test my changes against, so here's a start. llvm-svn: 240717 --- llvm/test/DebugInfo/bitfields.ll | 104 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 llvm/test/DebugInfo/bitfields.ll diff --git a/llvm/test/DebugInfo/bitfields.ll b/llvm/test/DebugInfo/bitfields.ll new file mode 100644 index 0000000..a7615d4 --- /dev/null +++ b/llvm/test/DebugInfo/bitfields.ll @@ -0,0 +1,104 @@ +; RUN: %llc_dwarf -mtriple x86_64-apple-macosx -O0 -filetype=obj -o %t_le.o %s +; RUN: llvm-dwarfdump -debug-dump=info %t_le.o | FileCheck %s --check-prefix=CHECK-LE +; RUN: %llc_dwarf -mtriple aarch64_be-gnu-linux -O0 -filetype=obj -o %t_be.o %s +; RUN: llvm-dwarfdump -debug-dump=info %t_be.o | FileCheck %s --check-prefix=CHECK-BE + +; Produced at -O0 from: +; struct bitfield { +; int a : 2; +; int b : 32; +; int c : 1; +; int d : 28; +; }; +; struct bitfield b; + +; Note that DWARF 2 counts bit offsets backwards from the high end of +; the storage unit to the high end of the bit field. + +; CHECK-LE: DW_TAG_member +; CHECK-LE-NEXT: DW_AT_name{{.*}}"a" +; CHECK-LE-NOT: DW_TAG_member +; CHECK-LE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-LE-NEXT: DW_AT_bit_size {{.*}} (0x02) +; CHECK-LE-NEXT: DW_AT_bit_offset {{.*}} (0x1e) +; CHECK-LE-NEXT: DW_AT_data_member_location {{.*}} 00 + +; CHECK-LE: DW_TAG_member +; CHECK-LE-NEXT: DW_AT_name{{.*}}"b" +; CHECK-LE-NOT: DW_TAG_member +; CHECK-LE: DW_AT_data_member_location {{.*}} 04 + +; CHECK-LE: DW_TAG_member +; CHECK-LE-NEXT: DW_AT_name{{.*}}"c" +; CHECK-LE-NOT: DW_TAG_member +; CHECK-LE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-LE-NEXT: DW_AT_bit_size {{.*}} (0x01) +; CHECK-LE-NEXT: DW_AT_bit_offset {{.*}} (0x1f) +; CHECK-LE-NEXT: DW_AT_data_member_location {{.*}} 08 + +; CHECK-LE: DW_TAG_member +; CHECK-LE-NEXT: DW_AT_name{{.*}}"d" +; CHECK-LE-NOT: DW_TAG_member +; CHECK-LE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-LE-NEXT: DW_AT_bit_size {{.*}} (0x1c) +; CHECK-LE-NEXT: DW_AT_bit_offset {{.*}} (0x03) +; CHECK-LE-NEXT: DW_AT_data_member_location {{.*}} 08 + +; CHECK-BE: DW_TAG_member +; CHECK-BE-NEXT: DW_AT_name{{.*}}"a" +; CHECK-BE-NOT: DW_TAG_member +; CHECK-BE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-BE-NEXT: DW_AT_bit_size {{.*}} (0x02) +; CHECK-BE-NEXT: DW_AT_bit_offset {{.*}} (0x00) +; CHECK-BE-NEXT: DW_AT_data_member_location {{.*}} 00 + +; CHECK-BE: DW_TAG_member +; CHECK-BE-NEXT: DW_AT_name{{.*}}"b" +; CHECK-BE-NOT: DW_TAG_member +; CHECK-BE: DW_AT_data_member_location {{.*}} 04 + +; CHECK-BE: DW_TAG_member +; CHECK-BE-NEXT: DW_AT_name{{.*}}"c" +; CHECK-BE-NOT: DW_TAG_member +; CHECK-BE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-BE-NEXT: DW_AT_bit_size {{.*}} (0x01) +; CHECK-BE-NEXT: DW_AT_bit_offset {{.*}} (0x00) +; CHECK-BE-NEXT: DW_AT_data_member_location {{.*}} 08 + +; CHECK-BE: DW_TAG_member +; CHECK-BE-NEXT: DW_AT_name{{.*}}"d" +; CHECK-BE-NOT: DW_TAG_member +; CHECK-BE: DW_AT_byte_size {{.*}} (0x04) +; CHECK-BE-NEXT: DW_AT_bit_size {{.*}} (0x1c) +; CHECK-BE-NEXT: DW_AT_bit_offset {{.*}} (0x01) +; CHECK-BE-NEXT: DW_AT_data_member_location {{.*}} 08 + +; ModuleID = 'bitfields.c' +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx" + +%struct.bitfield = type <{ i8, [3 x i8], i64 }> + +@b = common global %struct.bitfield zeroinitializer, align 4 + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!13, !14, !15} +!llvm.ident = !{!16} + +!0 = !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2) +!1 = !DIFile(filename: "bitfields.c", directory: "/") +!2 = !{} +!3 = !{!4} +!4 = !DIGlobalVariable(name: "b", scope: !0, file: !5, line: 8, type: !6, isLocal: false, isDefinition: true, variable: %struct.bitfield* @b) +!5 = !DIFile(filename: "bitfields.c", directory: "/") +!6 = !DICompositeType(tag: DW_TAG_structure_type, name: "bitfield", file: !5, line: 1, size: 96, align: 32, elements: !7) +!7 = !{!8, !10, !11, !12} +!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !5, line: 2, baseType: !9, size: 2, align: 32) +!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) +!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !5, line: 3, baseType: !9, size: 32, align: 32, offset: 32) +!11 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !6, file: !5, line: 4, baseType: !9, size: 1, align: 32, offset: 64) +!12 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !6, file: !5, line: 5, baseType: !9, size: 28, align: 32, offset: 65) +!13 = !{i32 2, !"Dwarf Version", i32 2} +!14 = !{i32 2, !"Debug Info Version", i32 3} +!15 = !{i32 1, !"PIC Level", i32 2} +!16 = !{!"clang version 3.7.0 (trunk 240548) (llvm/trunk 240554)"} -- 2.7.4