Add check for self-assignment. NFC

Differential Revision: https://reviews.llvm.org/D39578

llvm-svn: 318164

lldb/source/Core/RegisterValue.cpp

@@ -539,6 +539,9 @@ bool RegisterValue::SignExtend(uint32_t sign_bitpos) {
 }
 
 bool RegisterValue::CopyValue(const RegisterValue &rhs) {
+  if (this == &rhs)
+    return rhs.m_type == eTypeInvalid ? false : true;
+
   m_type = rhs.m_type;
   switch (m_type) {
   case eTypeInvalid:

lldb/source/Core/Value.cpp

@@ -142,6 +142,9 @@ Type *Value::GetType() {
 }
 
 size_t Value::AppendDataToHostBuffer(const Value &rhs) {
+  if (this == &rhs)
+    return 0;
+
   size_t curr_size = m_data_buffer.GetByteSize();
   Status error;
   switch (rhs.GetValueType()) {