[DWARF5] Added support for deleted C++ special member functions.

This patch adds support for deleted C++ special member functions in
clang and llvm. Also added Defaulted member encodings for future
support for defaulted member functions.

Patch by Sourabh Singh Tomar!

Differential Revision: https://reviews.llvm.org/D69215

2 files changed, 18 insertions, 0 deletions

diff --git a/llvm/lib/BinaryFormat/Dwarf.cpp b/llvm/lib/BinaryFormat/Dwarf.cpp
index d06cccdf0df..9ca3317418c 100644
--- a/llvm/lib/BinaryFormat/Dwarf.cpp
+++ b/llvm/lib/BinaryFormat/Dwarf.cpp
@@ -274,6 +274,19 @@ StringRef llvm::dwarf::AccessibilityString(unsigned Access) {
   return StringRef();
 }
 
+StringRef llvm::dwarf::DefaultedMemberString(unsigned DefaultedEncodings) {
+  switch (DefaultedEncodings) {
+  // Defaulted Member Encodings codes
+  case DW_DEFAULTED_no:
+    return "DW_DEFAULTED_no";
+  case DW_DEFAULTED_in_class:
+    return "DW_DEFAULTED_in_class";
+  case DW_DEFAULTED_out_of_class:
+    return "DW_DEFAULTED_out_of_class";
+  }
+  return StringRef();
+}
+
 StringRef llvm::dwarf::VisibilityString(unsigned Visibility) {
   switch (Visibility) {
   case DW_VIS_local:
@@ -615,6 +628,8 @@ StringRef llvm::dwarf::AttributeValueString(uint16_t Attr, unsigned Val) {
     return ArrayOrderString(Val);
   case DW_AT_APPLE_runtime_class:
     return LanguageString(Val);
+  case DW_AT_defaulted:
+    return DefaultedMemberString(Val);
   }
 
   return StringRef();
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 37c68c08579..9d7fee1d5b3 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -1307,6 +1307,9 @@ void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
     addFlag(SPDie, dwarf::DW_AT_elemental);
   if (SP->isRecursive())
     addFlag(SPDie, dwarf::DW_AT_recursive);
+
+  if (DD->getDwarfVersion() >= 5 && SP->isDeleted())
+    addFlag(SPDie, dwarf::DW_AT_deleted);
 }
 
 void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,