Debug Info: In symmetry to DW_TAG_pointer_type, do not emit the byte size

of a DW_TAG_ptr_to_member_type.
This restores the behavior from before r224780-r224781.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224799 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 7606a61ff714b59a4d99296c43a316c615bbfe46..f630b6ab64c89e5a253ad673ef22d108d6632538 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -985,7 +985,8 @@ void DwarfUnit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
     addString(Buffer, dwarf::DW_AT_name, Name);
 
   // Add size if non-zero (derived types might be zero-sized.)
-  if (Size && Tag != dwarf::DW_TAG_pointer_type)
+  if (Size && Tag != dwarf::DW_TAG_pointer_type
+           && Tag != dwarf::DW_TAG_ptr_to_member_type)
     addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
 
   if (Tag == dwarf::DW_TAG_ptr_to_member_type)

diff --git a/test/DebugInfo/X86/memberfnptr.ll b/test/DebugInfo/X86/memberfnptr.ll
new file mode 100644 (file)
index 0000000..6d34601
--- /dev/null
+++ b/test/DebugInfo/X86/memberfnptr.ll
@@ -0,0 +1,44 @@
+; struct A {
+;   void foo();
+; };
+;  
+; void (A::*p)() = &A::foo;
+;
+; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; Check that the member function pointer is emitted without a DW_AT_size attribute.
+; CHECK: DW_TAG_ptr_to_member_type
+; CHECK-NOT: DW_AT_{{.*}}size
+; CHECK: DW_TAG
+;
+; ModuleID = 'memberfnptr.cpp'
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx"
+
+%struct.A = type { i8 }
+
+@p = global { i64, i64 } { i64 ptrtoint (void (%struct.A*)* @_ZN1A3fooEv to i64), i64 0 }, align 8
+
+declare void @_ZN1A3fooEv(%struct.A*)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!14, !15, !16}
+!llvm.ident = !{!17}
+
+!0 = !{!"0x11\004\00clang version 3.6.0 \000\00\000\00\001", !1, !2, !3, !2, !10, !2} ; [ DW_TAG_compile_unit ] [/memberfnptr.cpp] [DW_LANG_C_plus_plus]
+!1 = !{!"memberfnptr.cpp", !""}
+!2 = !{}
+!3 = !{!4}
+!4 = !{!"0x13\00A\001\008\008\000\000\000", !1, null, null, !5, null, null, !"_ZTS1A"} ; [ DW_TAG_structure_type ] [A] [line 1, size 8, align 8, offset 0] [def] [from ]
+!5 = !{!6}
+!6 = !{!"0x2e\00foo\00foo\00_ZN1A3fooEv\002\000\000\000\000\00256\000\002", !1, !"_ZTS1A", !7, null, null, null, null, null} ; [ DW_TAG_subprogram ] [line 2] [foo]
+!7 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !8, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!8 = !{null, !9}
+!9 = !{!"0xf\00\000\0064\0064\000\001088\00", null, null, !"_ZTS1A"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS1A]
+!10 = !{!11}
+!11 = !{!"0x34\00p\00p\00\005\000\001", null, !12, !13, { i64, i64 }* @p, null} ; [ DW_TAG_variable ] [p] [line 5] [def]
+!12 = !{!"0x29", !1}                              ; [ DW_TAG_file_type ] [/memberfnptr.cpp]
+!13 = !{!"0x1f\00\000\0064\000\000\000", null, null, !7, !"_ZTS1A"} ; [ DW_TAG_ptr_to_member_type ] [line 0, size 64, align 0, offset 0] [from ]
+!14 = !{i32 2, !"Dwarf Version", i32 2}
+!15 = !{i32 2, !"Debug Info Version", i32 2}
+!16 = !{i32 1, !"PIC Level", i32 2}
+!17 = !{!"clang version 3.6.0 "}