Debug Info / PR22309: Allow union types to be emitted as unsigned constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226919 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 3d3da2ac1d312980abcf738e01d599f7904a7263..0d1979d7d83019a80b0fd3f6958fc0485c4c8b32 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -584,7 +584,8 @@ static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
         T == dwarf::DW_TAG_ptr_to_member_type ||
         T == dwarf::DW_TAG_reference_type ||
         T == dwarf::DW_TAG_rvalue_reference_type ||
-        T == dwarf::DW_TAG_structure_type)
+        T == dwarf::DW_TAG_structure_type ||
+        T == dwarf::DW_TAG_union_type)
       return true;
     assert(T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type ||
            T == dwarf::DW_TAG_volatile_type ||

diff --git a/test/DebugInfo/X86/union-const.ll b/test/DebugInfo/X86/union-const.ll
new file mode 100644 (file)
index 0000000..552b52d
--- /dev/null
+++ b/test/DebugInfo/X86/union-const.ll
@@ -0,0 +1,66 @@
+; RUN: llc -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; CHECK: DW_TAG_variable
+; CHECK-NEXT: DW_AT_const_value [DW_FORM_udata]        (0)
+; CHECK-NEXT: DW_AT_name {{.*}}"a"
+;
+; ModuleID = 'union.c'
+; generated at -O1 from:
+; union mfi_evt {
+;   struct {
+;     int reserved;
+;   } members;
+; } mfi_aen_setup() {
+;   union mfi_evt a;
+;   a.members.reserved = 0;
+; }
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+%union.mfi_evt = type { %struct.anon }
+%struct.anon = type { i32 }
+
+; Function Attrs: nounwind readnone ssp uwtable
+define i32 @mfi_aen_setup() #0 {
+entry:
+  tail call void @llvm.dbg.declare(metadata %union.mfi_evt* undef, metadata !16, metadata !21), !dbg !22
+  tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !16, metadata !21), !dbg !22
+  ret i32 undef, !dbg !23
+}
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
+
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone ssp uwtable }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!17, !18, !19}
+!llvm.ident = !{!20}
+
+!0 = !{!"0x11\0012\00clang version 3.7.0 (trunk 226915) (llvm/trunk 226905)\001\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/union.c] [DW_LANG_C99]
+!1 = !{!"union.c", !""}
+!2 = !{}
+!3 = !{!4}
+!4 = !{!"0x2e\00mfi_aen_setup\00mfi_aen_setup\00\005\000\001\000\000\000\001\005", !1, !5, !6, null, i32 ()* @mfi_aen_setup, null, null, !15} ; [ DW_TAG_subprogram ] [line 5] [def] [mfi_aen_setup]
+!5 = !{!"0x29", !1}                               ; [ DW_TAG_file_type ] [/union.c]
+!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = !{!8}
+!8 = !{!"0x17\00mfi_evt\001\0032\0032\000\000\000", !1, null, null, !9, null, null, null} ; [ DW_TAG_union_type ] [mfi_evt] [line 1, size 32, align 32, offset 0] [def] [from ]
+!9 = !{!10}
+!10 = !{!"0xd\00members\004\0032\0032\000\000", !1, !8, !11} ; [ DW_TAG_member ] [members] [line 4, size 32, align 32, offset 0] [from ]
+!11 = !{!"0x13\00\002\0032\0032\000\000\000", !1, !8, null, !12, null, null, null} ; [ DW_TAG_structure_type ] [line 2, size 32, align 32, offset 0] [def] [from ]
+!12 = !{!13}
+!13 = !{!"0xd\00reserved\003\0032\0032\000\000", !1, !11, !14} ; [ DW_TAG_member ] [reserved] [line 3, size 32, align 32, offset 0] [from int]
+!14 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!15 = !{!16}
+!16 = !{!"0x100\00a\006\000", !4, !5, !8}         ; [ DW_TAG_auto_variable ] [a] [line 6]
+!17 = !{i32 2, !"Dwarf Version", i32 2}
+!18 = !{i32 2, !"Debug Info Version", i32 2}
+!19 = !{i32 1, !"PIC Level", i32 2}
+!20 = !{!"clang version 3.7.0 (trunk 226915) (llvm/trunk 226905)"}
+!21 = !{!"0x102"}                                 ; [ DW_TAG_expression ]
+!22 = !MDLocation(line: 6, column: 17, scope: !4)
+!23 = !MDLocation(line: 8, column: 1, scope: !4)