Index: lldb/include/lldb/Core/Value.h
===================================================================
--- lldb/include/lldb/Core/Value.h
+++ lldb/include/lldb/Core/Value.h
@@ -37,27 +37,32 @@
 
 class Value {
 public:
-  // Values Less than zero are an error, greater than or equal to zero returns
-  // what the Scalar result is.
-  enum ValueType {
-    // m_value contains...
-    // ============================
-    eValueTypeScalar,      // raw scalar value
-    eValueTypeFileAddress, // file address value
-    eValueTypeLoadAddress, // load address value
-    eValueTypeHostAddress  // host address value (for memory in the process that
-                           // is using liblldb)
+  /// Type that describes Value::m_value.
+  enum class ValueType {
+    Invalid = -1,
+    // m_value contains:
+    /// A raw scalar value.
+    Scalar = 0,
+    /// A file address value.
+    FileAddress,
+    /// A load address value.
+    LoadAddress,
+    /// A host address value (for memory in the process that < A is
+    /// using liblldb).
+    HostAddress
   };
 
-  enum ContextType // Type that describes Value::m_context
-  {
-    // m_context contains...
-    // ====================
-    eContextTypeInvalid,      // undefined
-    eContextTypeRegisterInfo, // RegisterInfo * (can be a scalar or a vector
-                              // register)
-    eContextTypeLLDBType,     // lldb_private::Type *
-    eContextTypeVariable      // lldb_private::Variable *
+  /// Type that describes Value::m_context.
+  enum class ContextType {
+    // m_context contains:
+    /// Undefined.
+    Invalid = -1,
+    /// RegisterInfo * (can be a scalar or a vector register).
+    RegisterInfo = 0,
+    /// lldb_private::Type *.
+    LLDBType,
+    /// lldb_private::Variable *.
+    Variable
   };
 
   Value();
@@ -85,16 +90,16 @@
 
   void ClearContext() {
     m_context = nullptr;
-    m_context_type = eContextTypeInvalid;
+    m_context_type = ContextType::Invalid;
   }
 
   void SetContext(ContextType context_type, void *p) {
     m_context_type = context_type;
     m_context = p;
-    if (m_context_type == eContextTypeRegisterInfo) {
+    if (m_context_type == ContextType::RegisterInfo) {
       RegisterInfo *reg_info = GetRegisterInfo();
       if (reg_info->encoding == lldb::eEncodingVector)
-        SetValueType(eValueTypeScalar);
+        SetValueType(ValueType::Scalar);
     }
   }
 
Index: lldb/include/lldb/Expression/ExpressionVariable.h
===================================================================
--- lldb/include/lldb/Expression/ExpressionVariable.h
+++ lldb/include/lldb/Expression/ExpressionVariable.h
@@ -48,7 +48,7 @@
 
   void SetRegisterInfo(const RegisterInfo *reg_info) {
     return m_frozen_sp->GetValue().SetContext(
-        Value::eContextTypeRegisterInfo, const_cast<RegisterInfo *>(reg_info));
+        Value::ContextType::RegisterInfo, const_cast<RegisterInfo *>(reg_info));
   }
 
   CompilerType GetCompilerType() { return m_frozen_sp->GetCompilerType(); }
Index: lldb/source/Core/Value.cpp
===================================================================
--- lldb/source/Core/Value.cpp
+++ lldb/source/Core/Value.cpp
@@ -40,17 +40,17 @@
 
 Value::Value()
     : m_value(), m_compiler_type(), m_context(nullptr),
-      m_value_type(eValueTypeScalar), m_context_type(eContextTypeInvalid),
+      m_value_type(ValueType::Scalar), m_context_type(ContextType::Invalid),
       m_data_buffer() {}
 
 Value::Value(const Scalar &scalar)
     : m_value(scalar), m_compiler_type(), m_context(nullptr),
-      m_value_type(eValueTypeScalar), m_context_type(eContextTypeInvalid),
+      m_value_type(ValueType::Scalar), m_context_type(ContextType::Invalid),
       m_data_buffer() {}
 
 Value::Value(const void *bytes, int len)
     : m_value(), m_compiler_type(), m_context(nullptr),
-      m_value_type(eValueTypeHostAddress), m_context_type(eContextTypeInvalid),
+      m_value_type(ValueType::HostAddress), m_context_type(ContextType::Invalid),
       m_data_buffer() {
   SetBytes(bytes, len);
 }
@@ -91,13 +91,13 @@
 }
 
 void Value::SetBytes(const void *bytes, int len) {
-  m_value_type = eValueTypeHostAddress;
+  m_value_type = ValueType::HostAddress;
   m_data_buffer.CopyData(bytes, len);
   m_value = (uintptr_t)m_data_buffer.GetBytes();
 }
 
 void Value::AppendBytes(const void *bytes, int len) {
-  m_value_type = eValueTypeHostAddress;
+  m_value_type = ValueType::HostAddress;
   m_data_buffer.AppendData(bytes, len);
   m_value = (uintptr_t)m_data_buffer.GetBytes();
 }
@@ -113,26 +113,27 @@
 
 AddressType Value::GetValueAddressType() const {
   switch (m_value_type) {
-  case eValueTypeScalar:
+  case ValueType::Invalid:
+  case ValueType::Scalar:
     break;
-  case eValueTypeLoadAddress:
+  case ValueType::LoadAddress:
     return eAddressTypeLoad;
-  case eValueTypeFileAddress:
+  case ValueType::FileAddress:
     return eAddressTypeFile;
-  case eValueTypeHostAddress:
+  case ValueType::HostAddress:
     return eAddressTypeHost;
   }
   return eAddressTypeInvalid;
 }
 
 RegisterInfo *Value::GetRegisterInfo() const {
-  if (m_context_type == eContextTypeRegisterInfo)
+  if (m_context_type == ContextType::RegisterInfo)
     return static_cast<RegisterInfo *>(m_context);
   return nullptr;
 }
 
 Type *Value::GetType() {
-  if (m_context_type == eContextTypeLLDBType)
+  if (m_context_type == ContextType::LLDBType)
     return static_cast<Type *>(m_context);
   return nullptr;
 }
@@ -144,7 +145,9 @@
   size_t curr_size = m_data_buffer.GetByteSize();
   Status error;
   switch (rhs.GetValueType()) {
-  case eValueTypeScalar: {
+  case ValueType::Invalid:
+    return 0;
+  case ValueType::Scalar: {
     const size_t scalar_size = rhs.m_value.GetByteSize();
     if (scalar_size > 0) {
       const size_t new_size = curr_size + scalar_size;
@@ -156,9 +159,9 @@
       }
     }
   } break;
-  case eValueTypeFileAddress:
-  case eValueTypeLoadAddress:
-  case eValueTypeHostAddress: {
+  case ValueType::FileAddress:
+  case ValueType::LoadAddress:
+  case ValueType::HostAddress: {
     const uint8_t *src = rhs.GetBuffer().GetBytes();
     const size_t src_len = rhs.GetBuffer().GetByteSize();
     if (src && src_len > 0) {
@@ -174,7 +177,7 @@
 }
 
 size_t Value::ResizeData(size_t len) {
-  m_value_type = eValueTypeHostAddress;
+  m_value_type = ValueType::HostAddress;
   m_data_buffer.SetByteSize(len);
   m_value = (uintptr_t)m_data_buffer.GetBytes();
   return m_data_buffer.GetByteSize();
@@ -182,12 +185,12 @@
 
 bool Value::ValueOf(ExecutionContext *exe_ctx) {
   switch (m_context_type) {
-  case eContextTypeInvalid:
-  case eContextTypeRegisterInfo: // RegisterInfo *
-  case eContextTypeLLDBType:     // Type *
+  case ContextType::Invalid:
+  case ContextType::RegisterInfo: // RegisterInfo *
+  case ContextType::LLDBType:     // Type *
     break;
 
-  case eContextTypeVariable: // Variable *
+  case ContextType::Variable: // Variable *
     ResolveValue(exe_ctx);
     return true;
   }
@@ -196,7 +199,7 @@
 
 uint64_t Value::GetValueByteSize(Status *error_ptr, ExecutionContext *exe_ctx) {
   switch (m_context_type) {
-  case eContextTypeRegisterInfo: // RegisterInfo *
+  case ContextType::RegisterInfo: // RegisterInfo *
     if (GetRegisterInfo()) {
       if (error_ptr)
         error_ptr->Clear();
@@ -204,9 +207,9 @@
     }
     break;
 
-  case eContextTypeInvalid:
-  case eContextTypeLLDBType: // Type *
-  case eContextTypeVariable: // Variable *
+  case ContextType::Invalid:
+  case ContextType::LLDBType: // Type *
+  case ContextType::Variable: // Variable *
   {
     auto *scope = exe_ctx ? exe_ctx->GetBestExecutionContextScope() : nullptr;
     if (llvm::Optional<uint64_t> size = GetCompilerType().GetByteSize(scope)) {
@@ -225,19 +228,19 @@
 const CompilerType &Value::GetCompilerType() {
   if (!m_compiler_type.IsValid()) {
     switch (m_context_type) {
-    case eContextTypeInvalid:
+    case ContextType::Invalid:
       break;
 
-    case eContextTypeRegisterInfo:
+    case ContextType::RegisterInfo:
       break; // TODO: Eventually convert into a compiler type?
 
-    case eContextTypeLLDBType: {
+    case ContextType::LLDBType: {
       Type *lldb_type = GetType();
       if (lldb_type)
         m_compiler_type = lldb_type->GetForwardCompilerType();
     } break;
 
-    case eContextTypeVariable: {
+    case ContextType::Variable: {
       Variable *variable = GetVariable();
       if (variable) {
         Type *variable_type = variable->GetType();
@@ -257,14 +260,14 @@
 
 lldb::Format Value::GetValueDefaultFormat() {
   switch (m_context_type) {
-  case eContextTypeRegisterInfo:
+  case ContextType::RegisterInfo:
     if (GetRegisterInfo())
       return GetRegisterInfo()->format;
     break;
 
-  case eContextTypeInvalid:
-  case eContextTypeLLDBType:
-  case eContextTypeVariable: {
+  case ContextType::Invalid:
+  case ContextType::LLDBType:
+  case ContextType::Variable: {
     const CompilerType &ast_type = GetCompilerType();
     if (ast_type.IsValid())
       return ast_type.GetFormat();
@@ -277,14 +280,16 @@
 
 bool Value::GetData(DataExtractor &data) {
   switch (m_value_type) {
-  case eValueTypeScalar:
+  case ValueType::Invalid:
+    return false;
+  case ValueType::Scalar:
     if (m_value.GetData(data))
       return true;
     break;
 
-  case eValueTypeLoadAddress:
-  case eValueTypeFileAddress:
-  case eValueTypeHostAddress:
+  case ValueType::LoadAddress:
+  case ValueType::FileAddress:
+  case ValueType::HostAddress:
     if (m_data_buffer.GetByteSize()) {
       data.SetData(m_data_buffer.GetBytes(), m_data_buffer.GetByteSize(),
                    data.GetByteOrder());
@@ -312,7 +317,10 @@
     return error;
 
   switch (m_value_type) {
-  case eValueTypeScalar: {
+  case ValueType::Invalid:
+    error.SetErrorString("invalid value");
+    break;
+  case ValueType::Scalar: {
     data.SetByteOrder(endian::InlHostByteOrder());
     if (ast_type.IsValid())
       data.SetAddressByteSize(ast_type.GetPointerByteSize());
@@ -332,7 +340,7 @@
     error.SetErrorString("extracting data from value failed");
     break;
   }
-  case eValueTypeLoadAddress:
+  case ValueType::LoadAddress:
     if (exe_ctx == nullptr) {
       error.SetErrorString("can't read load address (no execution context)");
     } else {
@@ -369,7 +377,7 @@
     }
     break;
 
-  case eValueTypeFileAddress:
+  case ValueType::FileAddress:
     if (exe_ctx == nullptr) {
       error.SetErrorString("can't read file address (no execution context)");
     } else if (exe_ctx->GetTargetPtr() == nullptr) {
@@ -459,7 +467,7 @@
     }
     break;
 
-  case eValueTypeHostAddress:
+  case ValueType::HostAddress:
     address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
     address_type = eAddressTypeHost;
     if (exe_ctx) {
@@ -564,12 +572,13 @@
   const CompilerType &compiler_type = GetCompilerType();
   if (compiler_type.IsValid()) {
     switch (m_value_type) {
-    case eValueTypeScalar: // raw scalar value
+    case ValueType::Invalid:
+    case ValueType::Scalar: // raw scalar value
       break;
 
-    case eValueTypeFileAddress:
-    case eValueTypeLoadAddress: // load address value
-    case eValueTypeHostAddress: // host address value (for memory in the process
+    case ValueType::FileAddress:
+    case ValueType::LoadAddress: // load address value
+    case ValueType::HostAddress: // host address value (for memory in the process
                                 // that is using liblldb)
     {
       DataExtractor data;
@@ -581,17 +590,17 @@
                 data, 0, data.GetByteSize(), scalar,
                 exe_ctx ? exe_ctx->GetBestExecutionContextScope() : nullptr)) {
           m_value = scalar;
-          m_value_type = eValueTypeScalar;
+          m_value_type = ValueType::Scalar;
         } else {
           if ((uintptr_t)addr != (uintptr_t)m_data_buffer.GetBytes()) {
             m_value.Clear();
-            m_value_type = eValueTypeScalar;
+            m_value_type = ValueType::Scalar;
           }
         }
       } else {
         if ((uintptr_t)addr != (uintptr_t)m_data_buffer.GetBytes()) {
           m_value.Clear();
-          m_value_type = eValueTypeScalar;
+          m_value_type = ValueType::Scalar;
         }
       }
     } break;
@@ -601,7 +610,7 @@
 }
 
 Variable *Value::GetVariable() {
-  if (m_context_type == eContextTypeVariable)
+  if (m_context_type == ContextType::Variable)
     return static_cast<Variable *>(m_context);
   return nullptr;
 }
@@ -609,42 +618,44 @@
 void Value::Clear() {
   m_value.Clear();
   m_compiler_type.Clear();
-  m_value_type = eValueTypeScalar;
+  m_value_type = ValueType::Scalar;
   m_context = nullptr;
-  m_context_type = eContextTypeInvalid;
+  m_context_type = ContextType::Invalid;
   m_data_buffer.Clear();
 }
 
 const char *Value::GetValueTypeAsCString(ValueType value_type) {
   switch (value_type) {
-  case eValueTypeScalar:
+  case ValueType::Invalid:
+    return "invalid";
+  case ValueType::Scalar:
     return "scalar";
-  case eValueTypeFileAddress:
+  case ValueType::FileAddress:
     return "file address";
-  case eValueTypeLoadAddress:
+  case ValueType::LoadAddress:
     return "load address";
-  case eValueTypeHostAddress:
+  case ValueType::HostAddress:
     return "host address";
   };
-  return "???";
+  llvm_unreachable("enum cases exhausted.");
 }
 
 const char *Value::GetContextTypeAsCString(ContextType context_type) {
   switch (context_type) {
-  case eContextTypeInvalid:
+  case ContextType::Invalid:
     return "invalid";
-  case eContextTypeRegisterInfo:
+  case ContextType::RegisterInfo:
     return "RegisterInfo *";
-  case eContextTypeLLDBType:
+  case ContextType::LLDBType:
     return "Type *";
-  case eContextTypeVariable:
+  case ContextType::Variable:
     return "Variable *";
   };
-  return "???";
+  llvm_unreachable("enum cases exhausted.");
 }
 
 void Value::ConvertToLoadAddress(Module *module, Target *target) {
-  if (!module || !target || (GetValueType() != eValueTypeFileAddress))
+  if (!module || !target || (GetValueType() != ValueType::FileAddress))
     return;
 
   lldb::addr_t file_addr = GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
@@ -658,7 +669,7 @@
   if (load_addr == LLDB_INVALID_ADDRESS)
     return;
 
-  SetValueType(Value::eValueTypeLoadAddress);
+  SetValueType(Value::ValueType::LoadAddress);
   GetScalar() = load_addr;
 }
 
Index: lldb/source/Core/ValueObject.cpp
===================================================================
--- lldb/source/Core/ValueObject.cpp
+++ lldb/source/Core/ValueObject.cpp
@@ -336,8 +336,11 @@
       Value::ValueType value_type = value.GetValueType();
 
       switch (value_type) {
-      case Value::eValueTypeScalar:
-        if (value.GetContextType() == Value::eContextTypeRegisterInfo) {
+      case Value::ValueType::Invalid:
+        m_location_str = "invalid";
+        break;
+      case Value::ValueType::Scalar:
+        if (value.GetContextType() == Value::ContextType::RegisterInfo) {
           RegisterInfo *reg_info = value.GetRegisterInfo();
           if (reg_info) {
             if (reg_info->name)
@@ -354,9 +357,9 @@
           m_location_str = "scalar";
         break;
 
-      case Value::eValueTypeLoadAddress:
-      case Value::eValueTypeFileAddress:
-      case Value::eValueTypeHostAddress: {
+      case Value::ValueType::LoadAddress:
+      case Value::ValueType::FileAddress:
+      case Value::ValueType::HostAddress: {
         uint32_t addr_nibble_size = data.GetAddressByteSize() * 2;
         sstr.Printf("0x%*.*llx", addr_nibble_size, addr_nibble_size,
                     value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS));
@@ -852,7 +855,10 @@
   Value::ValueType value_type = m_value.GetValueType();
 
   switch (value_type) {
-  case Value::eValueTypeScalar: {
+  case Value::ValueType::Invalid:
+    error.SetErrorString("invalid location");
+    return false;
+  case Value::ValueType::Scalar: {
     Status set_error =
         m_value.GetScalar().SetValueFromData(data, encoding, byte_size);
 
@@ -862,7 +868,7 @@
       return false;
     }
   } break;
-  case Value::eValueTypeLoadAddress: {
+  case Value::ValueType::LoadAddress: {
     // If it is a load address, then the scalar value is the storage location
     // of the data, and we have to shove this value down to that load location.
     ExecutionContext exe_ctx(GetExecutionContextRef());
@@ -879,7 +885,7 @@
       }
     }
   } break;
-  case Value::eValueTypeHostAddress: {
+  case Value::ValueType::HostAddress: {
     // If it is a host address, then we stuff the scalar as a DataBuffer into
     // the Value's data.
     DataBufferSP buffer_sp(new DataBufferHeap(byte_size, 0));
@@ -889,7 +895,7 @@
                              byte_size, m_data.GetByteOrder());
     m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
   } break;
-  case Value::eValueTypeFileAddress:
+  case Value::ValueType::FileAddress:
     break;
   }
 
@@ -1107,7 +1113,7 @@
         if (m_is_bitfield_for_scalar)
           my_format = eFormatUnsigned;
         else {
-          if (m_value.GetContextType() == Value::eContextTypeRegisterInfo) {
+          if (m_value.GetContextType() == Value::ContextType::RegisterInfo) {
             const RegisterInfo *reg_info = m_value.GetRegisterInfo();
             if (reg_info)
               my_format = reg_info->format;
@@ -1455,7 +1461,9 @@
     return LLDB_INVALID_ADDRESS;
 
   switch (m_value.GetValueType()) {
-  case Value::eValueTypeScalar:
+  case Value::ValueType::Invalid:
+    return LLDB_INVALID_ADDRESS;
+  case Value::ValueType::Scalar:
     if (scalar_is_load_address) {
       if (address_type)
         *address_type = eAddressTypeLoad;
@@ -1463,13 +1471,13 @@
     }
     break;
 
-  case Value::eValueTypeLoadAddress:
-  case Value::eValueTypeFileAddress: {
+  case Value::ValueType::LoadAddress:
+  case Value::ValueType::FileAddress: {
     if (address_type)
       *address_type = m_value.GetValueAddressType();
     return m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
   } break;
-  case Value::eValueTypeHostAddress: {
+  case Value::ValueType::HostAddress: {
     if (address_type)
       *address_type = m_value.GetValueAddressType();
     return LLDB_INVALID_ADDRESS;
@@ -1489,13 +1497,15 @@
     return address;
 
   switch (m_value.GetValueType()) {
-  case Value::eValueTypeScalar:
+  case Value::ValueType::Invalid:
+    return LLDB_INVALID_ADDRESS;
+  case Value::ValueType::Scalar:
     address = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
     break;
 
-  case Value::eValueTypeHostAddress:
-  case Value::eValueTypeLoadAddress:
-  case Value::eValueTypeFileAddress: {
+  case Value::ValueType::HostAddress:
+  case Value::ValueType::LoadAddress:
+  case Value::ValueType::FileAddress: {
     lldb::offset_t data_offset = 0;
     address = m_data.GetAddress(&data_offset);
   } break;
@@ -1523,7 +1533,7 @@
 
   Value::ValueType value_type = m_value.GetValueType();
 
-  if (value_type == Value::eValueTypeScalar) {
+  if (value_type == Value::ValueType::Scalar) {
     // If the value is already a scalar, then let the scalar change itself:
     m_value.GetScalar().SetValueFromCString(value_str, encoding, byte_size);
   } else if (byte_size <= 16) {
@@ -1534,7 +1544,7 @@
     error = new_scalar.SetValueFromCString(value_str, encoding, byte_size);
     if (error.Success()) {
       switch (value_type) {
-      case Value::eValueTypeLoadAddress: {
+      case Value::ValueType::LoadAddress: {
         // If it is a load address, then the scalar value is the storage
         // location of the data, and we have to shove this value down to that
         // load location.
@@ -1553,7 +1563,7 @@
           }
         }
       } break;
-      case Value::eValueTypeHostAddress: {
+      case Value::ValueType::HostAddress: {
         // If it is a host address, then we stuff the scalar as a DataBuffer
         // into the Value's data.
         DataExtractor new_data;
@@ -1570,8 +1580,11 @@
         m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
 
       } break;
-      case Value::eValueTypeFileAddress:
-      case Value::eValueTypeScalar:
+      case Value::ValueType::Invalid:
+        error.SetErrorString("invalid location");
+        return false;
+      case Value::ValueType::FileAddress:
+      case Value::ValueType::Scalar:
         break;
       }
     } else {
@@ -1980,7 +1993,7 @@
   if (m_is_synthetic_children_generated) {
     UpdateValueIfNeeded();
 
-    if (m_value.GetValueType() == Value::eValueTypeLoadAddress) {
+    if (m_value.GetValueType() == Value::ValueType::LoadAddress) {
       if (IsPointerOrReferenceType()) {
         s.Printf("((%s)0x%" PRIx64 ")", GetTypeName().AsCString("void"),
                  GetValueAsUnsigned(0));
@@ -3093,7 +3106,7 @@
           exe_ctx.GetAddressByteSize()));
       if (ptr_result_valobj_sp) {
         ptr_result_valobj_sp->GetValue().SetValueType(
-            Value::eValueTypeLoadAddress);
+            Value::ValueType::LoadAddress);
         Status err;
         ptr_result_valobj_sp = ptr_result_valobj_sp->Dereference(err);
         if (ptr_result_valobj_sp && !name.empty())
Index: lldb/source/Core/ValueObjectChild.cpp
===================================================================
--- lldb/source/Core/ValueObjectChild.cpp
+++ lldb/source/Core/ValueObjectChild.cpp
@@ -125,28 +125,30 @@
         case eAddressTypeFile: {
           lldb::ProcessSP process_sp(GetProcessSP());
           if (process_sp && process_sp->IsAlive())
-            m_value.SetValueType(Value::eValueTypeLoadAddress);
+            m_value.SetValueType(Value::ValueType::LoadAddress);
           else
-            m_value.SetValueType(Value::eValueTypeFileAddress);
+            m_value.SetValueType(Value::ValueType::FileAddress);
         } break;
         case eAddressTypeLoad:
           m_value.SetValueType(is_instance_ptr_base
-                                   ? Value::eValueTypeScalar
-                                   : Value::eValueTypeLoadAddress);
+                                   ? Value::ValueType::Scalar
+                                   : Value::ValueType::LoadAddress);
           break;
         case eAddressTypeHost:
-          m_value.SetValueType(Value::eValueTypeHostAddress);
+          m_value.SetValueType(Value::ValueType::HostAddress);
           break;
         case eAddressTypeInvalid:
           // TODO: does this make sense?
-          m_value.SetValueType(Value::eValueTypeScalar);
+          m_value.SetValueType(Value::ValueType::Scalar);
           break;
         }
       }
       switch (m_value.GetValueType()) {
-      case Value::eValueTypeLoadAddress:
-      case Value::eValueTypeFileAddress:
-      case Value::eValueTypeHostAddress: {
+      case Value::ValueType::Invalid:
+        break;
+      case Value::ValueType::LoadAddress:
+      case Value::ValueType::FileAddress:
+      case Value::ValueType::HostAddress: {
         lldb::addr_t addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
         if (addr == LLDB_INVALID_ADDRESS) {
           m_error.SetErrorString("parent address is invalid.");
@@ -182,7 +184,7 @@
         }
       } break;
 
-      case Value::eValueTypeScalar:
+      case Value::ValueType::Scalar:
         // try to extract the child value from the parent's scalar value
         {
           Scalar scalar(m_value.GetScalar());
Index: lldb/source/Core/ValueObjectConstResult.cpp
===================================================================
--- lldb/source/Core/ValueObjectConstResult.cpp
+++ lldb/source/Core/ValueObjectConstResult.cpp
@@ -73,7 +73,7 @@
   }
 
   m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
-  m_value.SetValueType(Value::eValueTypeHostAddress);
+  m_value.SetValueType(Value::ValueType::HostAddress);
   m_value.SetCompilerType(compiler_type);
   m_name = name;
   SetIsConstant();
@@ -115,7 +115,7 @@
   m_data.SetAddressByteSize(data_addr_size);
   m_data.SetData(data_sp);
   m_value.GetScalar() = (uintptr_t)data_sp->GetBytes();
-  m_value.SetValueType(Value::eValueTypeHostAddress);
+  m_value.SetValueType(Value::ValueType::HostAddress);
   m_value.SetCompilerType(compiler_type);
   m_name = name;
   SetIsConstant();
@@ -145,19 +145,19 @@
   m_value.GetScalar() = address;
   m_data.SetAddressByteSize(addr_byte_size);
   m_value.GetScalar().GetData(m_data, addr_byte_size);
-  // m_value.SetValueType(Value::eValueTypeHostAddress);
+  // m_value.SetValueType(Value::ValueType::HostAddress);
   switch (address_type) {
   case eAddressTypeInvalid:
-    m_value.SetValueType(Value::eValueTypeScalar);
+    m_value.SetValueType(Value::ValueType::Scalar);
     break;
   case eAddressTypeFile:
-    m_value.SetValueType(Value::eValueTypeFileAddress);
+    m_value.SetValueType(Value::ValueType::FileAddress);
     break;
   case eAddressTypeLoad:
-    m_value.SetValueType(Value::eValueTypeLoadAddress);
+    m_value.SetValueType(Value::ValueType::LoadAddress);
     break;
   case eAddressTypeHost:
-    m_value.SetValueType(Value::eValueTypeHostAddress);
+    m_value.SetValueType(Value::ValueType::HostAddress);
     break;
   }
   m_value.SetCompilerType(compiler_type);
Index: lldb/source/Core/ValueObjectConstResultImpl.cpp
===================================================================
--- lldb/source/Core/ValueObjectConstResultImpl.cpp
+++ lldb/source/Core/ValueObjectConstResultImpl.cpp
@@ -132,7 +132,7 @@
         ConstString(new_name.c_str()), buffer, endian::InlHostByteOrder(),
         exe_ctx.GetAddressByteSize());
 
-    m_address_of_backend->GetValue().SetValueType(Value::eValueTypeScalar);
+    m_address_of_backend->GetValue().SetValueType(Value::ValueType::Scalar);
     m_address_of_backend->GetValue().GetScalar() = m_live_address;
 
     return m_address_of_backend;
Index: lldb/source/Core/ValueObjectMemory.cpp
===================================================================
--- lldb/source/Core/ValueObjectMemory.cpp
+++ lldb/source/Core/ValueObjectMemory.cpp
@@ -57,20 +57,20 @@
   // Do not attempt to construct one of these objects with no variable!
   assert(m_type_sp.get() != nullptr);
   SetName(ConstString(name));
-  m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
+  m_value.SetContext(Value::ContextType::LLDBType, m_type_sp.get());
   TargetSP target_sp(GetTargetSP());
   lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
   if (load_address != LLDB_INVALID_ADDRESS) {
-    m_value.SetValueType(Value::eValueTypeLoadAddress);
+    m_value.SetValueType(Value::ValueType::LoadAddress);
     m_value.GetScalar() = load_address;
   } else {
     lldb::addr_t file_address = m_address.GetFileAddress();
     if (file_address != LLDB_INVALID_ADDRESS) {
-      m_value.SetValueType(Value::eValueTypeFileAddress);
+      m_value.SetValueType(Value::ValueType::FileAddress);
       m_value.GetScalar() = file_address;
     } else {
       m_value.GetScalar() = m_address.GetOffset();
-      m_value.SetValueType(Value::eValueTypeScalar);
+      m_value.SetValueType(Value::ValueType::Scalar);
     }
   }
 }
@@ -92,16 +92,16 @@
   m_value.SetCompilerType(m_compiler_type);
   lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
   if (load_address != LLDB_INVALID_ADDRESS) {
-    m_value.SetValueType(Value::eValueTypeLoadAddress);
+    m_value.SetValueType(Value::ValueType::LoadAddress);
     m_value.GetScalar() = load_address;
   } else {
     lldb::addr_t file_address = m_address.GetFileAddress();
     if (file_address != LLDB_INVALID_ADDRESS) {
-      m_value.SetValueType(Value::eValueTypeFileAddress);
+      m_value.SetValueType(Value::ValueType::FileAddress);
       m_value.GetScalar() = file_address;
     } else {
       m_value.GetScalar() = m_address.GetOffset();
-      m_value.SetValueType(Value::eValueTypeScalar);
+      m_value.SetValueType(Value::ValueType::Scalar);
     }
   }
 }
@@ -168,15 +168,18 @@
     Value::ValueType value_type = m_value.GetValueType();
 
     switch (value_type) {
-    case Value::eValueTypeScalar:
+    case Value::ValueType::Invalid:
+      m_error.SetErrorString("Invalid value");
+      return false;
+    case Value::ValueType::Scalar:
       // The variable value is in the Scalar value inside the m_value. We can
       // point our m_data right to it.
       m_error = m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
       break;
 
-    case Value::eValueTypeFileAddress:
-    case Value::eValueTypeLoadAddress:
-    case Value::eValueTypeHostAddress:
+    case Value::ValueType::FileAddress:
+    case Value::ValueType::LoadAddress:
+    case Value::ValueType::HostAddress:
       // The DWARF expression result was an address in the inferior process. If
       // this variable is an aggregate type, we just need the address as the
       // main value as all child variable objects will rely upon this location
@@ -185,11 +188,11 @@
       // sure this type has a value before we try and read it
 
       // If we have a file address, convert it to a load address if we can.
-      if (value_type == Value::eValueTypeFileAddress &&
+      if (value_type == Value::ValueType::FileAddress &&
           exe_ctx.GetProcessPtr()) {
         lldb::addr_t load_addr = m_address.GetLoadAddress(target);
         if (load_addr != LLDB_INVALID_ADDRESS) {
-          m_value.SetValueType(Value::eValueTypeLoadAddress);
+          m_value.SetValueType(Value::ValueType::LoadAddress);
           m_value.GetScalar() = load_addr;
         }
       }
@@ -205,7 +208,7 @@
         // extract read its value into m_data appropriately
         Value value(m_value);
         if (m_type_sp)
-          value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
+          value.SetContext(Value::ContextType::LLDBType, m_type_sp.get());
         else {
           value.SetCompilerType(m_compiler_type);
         }
Index: lldb/source/Core/ValueObjectRegister.cpp
===================================================================
--- lldb/source/Core/ValueObjectRegister.cpp
+++ lldb/source/Core/ValueObjectRegister.cpp
@@ -249,9 +249,9 @@
         Process *process = exe_ctx.GetProcessPtr();
         if (process)
           m_data.SetAddressByteSize(process->GetAddressByteSize());
-        m_value.SetContext(Value::eContextTypeRegisterInfo,
+        m_value.SetContext(Value::ContextType::RegisterInfo,
                            (void *)&m_reg_info);
-        m_value.SetValueType(Value::eValueTypeHostAddress);
+        m_value.SetValueType(Value::ValueType::HostAddress);
         m_value.GetScalar() = (uintptr_t)m_data.GetDataStart();
         SetValueIsValid(true);
         SetValueDidChange(!(m_old_reg_value == m_reg_value));
Index: lldb/source/Core/ValueObjectVariable.cpp
===================================================================
--- lldb/source/Core/ValueObjectVariable.cpp
+++ lldb/source/Core/ValueObjectVariable.cpp
@@ -135,12 +135,12 @@
     if (expr.GetExpressionData(m_data)) {
        if (m_data.GetDataStart() && m_data.GetByteSize())
         m_value.SetBytes(m_data.GetDataStart(), m_data.GetByteSize());
-      m_value.SetContext(Value::eContextTypeVariable, variable);
+      m_value.SetContext(Value::ContextType::Variable, variable);
     }
     else
       m_error.SetErrorString("empty constant data");
     // constant bytes can't be edited - sorry
-    m_resolved_value.SetContext(Value::eContextTypeInvalid, nullptr);
+    m_resolved_value.SetContext(Value::ContextType::Invalid, nullptr);
   } else {
     lldb::addr_t loclist_base_load_addr = LLDB_INVALID_ADDRESS;
     ExecutionContext exe_ctx(GetExecutionContextRef());
@@ -163,7 +163,7 @@
     if (expr.Evaluate(&exe_ctx, nullptr, loclist_base_load_addr, nullptr,
                       nullptr, m_value, &m_error)) {
       m_resolved_value = m_value;
-      m_value.SetContext(Value::eContextTypeVariable, variable);
+      m_value.SetContext(Value::ContextType::Variable, variable);
 
       CompilerType compiler_type = GetCompilerType();
       if (compiler_type.IsValid())
@@ -183,7 +183,7 @@
       //
       // FIXME: When we grow m_value, we should represent the added bits as
       // undefined somehow instead of as 0's.
-      if (value_type == Value::eValueTypeHostAddress &&
+      if (value_type == Value::ValueType::HostAddress &&
           compiler_type.IsValid()) {
         if (size_t value_buf_size = m_value.GetBuffer().GetByteSize()) {
           size_t value_size = m_value.GetValueByteSize(&m_error, &exe_ctx);
@@ -196,16 +196,19 @@
       const bool process_is_alive = process && process->IsAlive();
 
       switch (value_type) {
-      case Value::eValueTypeScalar:
+      case Value::ValueType::Invalid:
+        m_error.SetErrorString("invalid value");
+        break;
+      case Value::ValueType::Scalar:
         // The variable value is in the Scalar value inside the m_value. We can
         // point our m_data right to it.
         m_error =
             m_value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
         break;
 
-      case Value::eValueTypeFileAddress:
-      case Value::eValueTypeLoadAddress:
-      case Value::eValueTypeHostAddress:
+      case Value::ValueType::FileAddress:
+      case Value::ValueType::LoadAddress:
+      case Value::ValueType::HostAddress:
         // The DWARF expression result was an address in the inferior process.
         // If this variable is an aggregate type, we just need the address as
         // the main value as all child variable objects will rely upon this
@@ -214,7 +217,7 @@
         // m_data. Make sure this type has a value before we try and read it
 
         // If we have a file address, convert it to a load address if we can.
-        if (value_type == Value::eValueTypeFileAddress && process_is_alive)
+        if (value_type == Value::ValueType::FileAddress && process_is_alive)
           m_value.ConvertToLoadAddress(GetModule().get(), target);
 
         if (!CanProvideValue()) {
@@ -227,7 +230,7 @@
           // Copy the Value and set the context to use our Variable so it can
           // extract read its value into m_data appropriately
           Value value(m_value);
-          value.SetContext(Value::eContextTypeVariable, variable);
+          value.SetContext(Value::ContextType::Variable, variable);
           m_error =
               value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
 
@@ -240,7 +243,7 @@
       SetValueIsValid(m_error.Success());
     } else {
       // could not find location, won't allow editing
-      m_resolved_value.SetContext(Value::eContextTypeInvalid, nullptr);
+      m_resolved_value.SetContext(Value::ContextType::Invalid, nullptr);
     }
   }
   
@@ -257,7 +260,9 @@
       (type_info & (lldb::eTypeIsPointer | lldb::eTypeIsReference)) != 0;
 
   switch (value_type) {
-  case Value::eValueTypeFileAddress:
+  case Value::ValueType::Invalid:
+    break;
+  case Value::ValueType::FileAddress:
     // If this type is a pointer, then its children will be considered load
     // addresses if the pointer or reference is dereferenced, but only if
     // the process is alive.
@@ -280,7 +285,7 @@
     else
       valobj.SetAddressTypeOfChildren(eAddressTypeFile);
     break;
-  case Value::eValueTypeHostAddress:
+  case Value::ValueType::HostAddress:
     // Same as above for load addresses, except children of pointer or refs
     // are always load addresses. Host addresses are used to store freeze
     // dried variables. If this type is a struct, the entire struct
@@ -291,8 +296,8 @@
     else
       valobj.SetAddressTypeOfChildren(eAddressTypeHost);
     break;
-  case Value::eValueTypeLoadAddress:
-  case Value::eValueTypeScalar:
+  case Value::ValueType::LoadAddress:
+  case Value::ValueType::Scalar:
     valobj.SetAddressTypeOfChildren(eAddressTypeLoad);
     break;
   }
@@ -343,7 +348,7 @@
 }
 
 const char *ValueObjectVariable::GetLocationAsCString() {
-  if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo)
+  if (m_resolved_value.GetContextType() == Value::ContextType::RegisterInfo)
     return GetLocationAsCStringImpl(m_resolved_value, m_data);
   else
     return ValueObject::GetLocationAsCString();
@@ -356,7 +361,7 @@
     return false;
   }
 
-  if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) {
+  if (m_resolved_value.GetContextType() == Value::ContextType::RegisterInfo) {
     RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo();
     ExecutionContext exe_ctx(GetExecutionContextRef());
     RegisterContext *reg_ctx = exe_ctx.GetRegisterContext();
@@ -385,7 +390,7 @@
     return false;
   }
 
-  if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) {
+  if (m_resolved_value.GetContextType() == Value::ContextType::RegisterInfo) {
     RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo();
     ExecutionContext exe_ctx(GetExecutionContextRef());
     RegisterContext *reg_ctx = exe_ctx.GetRegisterContext();
Index: lldb/source/DataFormatters/TypeFormat.cpp
===================================================================
--- lldb/source/DataFormatters/TypeFormat.cpp
+++ lldb/source/DataFormatters/TypeFormat.cpp
@@ -48,7 +48,7 @@
     ExecutionContext exe_ctx(valobj->GetExecutionContextRef());
     DataExtractor data;
 
-    if (context_type == Value::eContextTypeRegisterInfo) {
+    if (context_type == Value::ContextType::RegisterInfo) {
       const RegisterInfo *reg_info = value.GetRegisterInfo();
       if (reg_info) {
         Status error;
Index: lldb/source/Expression/DWARFExpression.cpp
===================================================================
--- lldb/source/Expression/DWARFExpression.cpp
+++ lldb/source/Expression/DWARFExpression.cpp
@@ -174,8 +174,8 @@
       RegisterValue reg_value;
       if (reg_ctx->ReadRegister(reg_info, reg_value)) {
         if (reg_value.GetScalarValue(value.GetScalar())) {
-          value.SetValueType(Value::eValueTypeScalar);
-          value.SetContext(Value::eContextTypeRegisterInfo,
+          value.SetValueType(Value::ValueType::Scalar);
+          value.SetContext(Value::ContextType::RegisterInfo,
                            const_cast<RegisterInfo *>(reg_info));
           if (error_ptr)
             error_ptr->Clear();
@@ -975,7 +975,7 @@
     // address and whose size is the size of an address on the target machine.
     case DW_OP_addr:
       stack.push_back(Scalar(opcodes.GetAddress(&offset)));
-      stack.back().SetValueType(Value::eValueTypeFileAddress);
+      stack.back().SetValueType(Value::ValueType::FileAddress);
       // Convert the file address to a load address, so subsequent
       // DWARF operators can operate on it.
       if (frame)
@@ -1034,14 +1034,14 @@
       }
       Value::ValueType value_type = stack.back().GetValueType();
       switch (value_type) {
-      case Value::eValueTypeHostAddress: {
+      case Value::ValueType::HostAddress: {
         void *src = (void *)stack.back().GetScalar().ULongLong();
         intptr_t ptr;
         ::memcpy(&ptr, src, sizeof(void *));
         stack.back().GetScalar() = ptr;
         stack.back().ClearContext();
       } break;
-      case Value::eValueTypeFileAddress: {
+      case Value::ValueType::FileAddress: {
         auto file_addr = stack.back().GetScalar().ULongLong(
             LLDB_INVALID_ADDRESS);
         if (!module_sp) {
@@ -1064,10 +1064,10 @@
           return false;
         }
         stack.back().GetScalar() = load_Addr;
-        stack.back().SetValueType(Value::eValueTypeLoadAddress);
+        stack.back().SetValueType(Value::ValueType::LoadAddress);
         // Fall through to load address code below...
       } LLVM_FALLTHROUGH;
-      case Value::eValueTypeLoadAddress:
+      case Value::ValueType::LoadAddress:
         if (exe_ctx) {
           if (process) {
             lldb::addr_t pointer_addr =
@@ -1099,9 +1099,10 @@
         }
         break;
 
-      default:
+      case Value::ValueType::Scalar:
+      case Value::ValueType::Invalid:
         if (error_ptr)
-          error_ptr->SetErrorString("Unhandled value type for DW_OP_deref.\n");
+          error_ptr->SetErrorString("Invalid value type for DW_OP_deref.\n");
         return false;
       }
 
@@ -1129,7 +1130,7 @@
       uint8_t size = opcodes.GetU8(&offset);
       Value::ValueType value_type = stack.back().GetValueType();
       switch (value_type) {
-      case Value::eValueTypeHostAddress: {
+      case Value::ValueType::HostAddress: {
         void *src = (void *)stack.back().GetScalar().ULongLong();
         intptr_t ptr;
         ::memcpy(&ptr, src, sizeof(void *));
@@ -1169,7 +1170,7 @@
         stack.back().GetScalar() = ptr;
         stack.back().ClearContext();
       } break;
-      case Value::eValueTypeLoadAddress:
+      case Value::ValueType::LoadAddress:
         if (exe_ctx) {
           if (process) {
             lldb::addr_t pointer_addr =
@@ -1209,19 +1210,23 @@
             }
           } else {
             if (error_ptr)
-              error_ptr->SetErrorString("NULL process for DW_OP_deref.\n");
+              error_ptr->SetErrorString("NULL process for DW_OP_deref_size.\n");
             return false;
           }
         } else {
           if (error_ptr)
             error_ptr->SetErrorString(
-                "NULL execution context for DW_OP_deref.\n");
+                "NULL execution context for DW_OP_deref_size.\n");
           return false;
         }
         break;
 
-      default:
-        break;
+      case Value::ValueType::Scalar:
+      case Value::ValueType::FileAddress:
+      case Value::ValueType::Invalid:
+        if (error_ptr)
+          error_ptr->SetErrorString("Invalid value for DW_OP_deref_size.\n");
+        return false;
       }
 
     } break;
@@ -2007,7 +2012,7 @@
         tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
         tmp.ClearContext();
         stack.push_back(tmp);
-        stack.back().SetValueType(Value::eValueTypeLoadAddress);
+        stack.back().SetValueType(Value::ValueType::LoadAddress);
       } else
         return false;
     } break;
@@ -2026,7 +2031,7 @@
         tmp.ResolveValue(exe_ctx) += (uint64_t)breg_offset;
         tmp.ClearContext();
         stack.push_back(tmp);
-        stack.back().SetValueType(Value::eValueTypeLoadAddress);
+        stack.back().SetValueType(Value::ValueType::LoadAddress);
       } else
         return false;
     } break;
@@ -2039,7 +2044,7 @@
             int64_t fbreg_offset = opcodes.GetSLEB128(&offset);
             value += fbreg_offset;
             stack.push_back(value);
-            stack.back().SetValueType(Value::eValueTypeLoadAddress);
+            stack.back().SetValueType(Value::ValueType::LoadAddress);
           } else
             return false;
         } else {
@@ -2103,7 +2108,9 @@
           const Value::ValueType curr_piece_source_value_type =
               curr_piece_source_value.GetValueType();
           switch (curr_piece_source_value_type) {
-          case Value::eValueTypeLoadAddress:
+          case Value::ValueType::Invalid:
+            return false;
+          case Value::ValueType::LoadAddress:
             if (process) {
               if (curr_piece.ResizeData(piece_byte_size) == piece_byte_size) {
                 lldb::addr_t load_addr =
@@ -2130,8 +2137,8 @@
             }
             break;
 
-          case Value::eValueTypeFileAddress:
-          case Value::eValueTypeHostAddress:
+          case Value::ValueType::FileAddress:
+          case Value::ValueType::HostAddress:
             if (error_ptr) {
               lldb::addr_t addr = curr_piece_source_value.GetScalar().ULongLong(
                   LLDB_INVALID_ADDRESS);
@@ -2139,14 +2146,14 @@
                   "failed to read memory DW_OP_piece(%" PRIu64
                   ") from %s address 0x%" PRIx64,
                   piece_byte_size, curr_piece_source_value.GetValueType() ==
-                                           Value::eValueTypeFileAddress
+                                           Value::ValueType::FileAddress
                                        ? "file"
                                        : "host",
                   addr);
             }
             return false;
 
-          case Value::eValueTypeScalar: {
+          case Value::ValueType::Scalar: {
             uint32_t bit_size = piece_byte_size * 8;
             uint32_t bit_offset = 0;
             Scalar &scalar = curr_piece_source_value.GetScalar();
@@ -2215,7 +2222,9 @@
         const uint64_t piece_bit_size = opcodes.GetULEB128(&offset);
         const uint64_t piece_bit_offset = opcodes.GetULEB128(&offset);
         switch (stack.back().GetValueType()) {
-        case Value::eValueTypeScalar: {
+        case Value::ValueType::Invalid:
+          return false;
+        case Value::ValueType::Scalar: {
           if (!stack.back().GetScalar().ExtractBitfield(piece_bit_size,
                                                         piece_bit_offset)) {
             if (error_ptr)
@@ -2228,9 +2237,9 @@
           }
         } break;
 
-        case Value::eValueTypeFileAddress:
-        case Value::eValueTypeLoadAddress:
-        case Value::eValueTypeHostAddress:
+        case Value::ValueType::FileAddress:
+        case Value::ValueType::LoadAddress:
+        case Value::ValueType::HostAddress:
           if (error_ptr) {
             error_ptr->SetErrorStringWithFormat(
                 "unable to extract DW_OP_bit_piece(bit_size = %" PRIu64
@@ -2342,7 +2351,7 @@
               "Expression stack needs at least 1 item for DW_OP_stack_value.");
         return false;
       }
-      stack.back().SetValueType(Value::eValueTypeScalar);
+      stack.back().SetValueType(Value::ValueType::Scalar);
       break;
 
     // OPCODE: DW_OP_convert
@@ -2430,7 +2439,7 @@
         addr_t cfa = id.GetCallFrameAddress();
         if (cfa != LLDB_INVALID_ADDRESS) {
           stack.push_back(Scalar(cfa));
-          stack.back().SetValueType(Value::eValueTypeLoadAddress);
+          stack.back().SetValueType(Value::ValueType::LoadAddress);
         } else if (error_ptr)
           error_ptr->SetErrorString("Stack frame does not include a canonical "
                                     "frame address for DW_OP_call_frame_cfa "
@@ -2490,7 +2499,7 @@
       }
 
       stack.back().GetScalar() = tls_load_addr;
-      stack.back().SetValueType(Value::eValueTypeLoadAddress);
+      stack.back().SetValueType(Value::ValueType::LoadAddress);
     } break;
 
     // OPCODE: DW_OP_addrx (DW_OP_GNU_addr_index is the legacy name.)
@@ -2510,7 +2519,7 @@
       uint64_t index = opcodes.GetULEB128(&offset);
       lldb::addr_t value = ReadAddressFromDebugAddrSection(dwarf_cu, index);
       stack.push_back(Scalar(value));
-      stack.back().SetValueType(Value::eValueTypeFileAddress);
+      stack.back().SetValueType(Value::ValueType::FileAddress);
     } break;
 
     // OPCODE: DW_OP_GNU_const_index
Index: lldb/source/Expression/FunctionCaller.cpp
===================================================================
--- lldb/source/Expression/FunctionCaller.cpp
+++ lldb/source/Expression/FunctionCaller.cpp
@@ -193,8 +193,8 @@
     // Special case: if it's a pointer, don't do anything (the ABI supports
     // passing cstrings)
 
-    if (arg_value->GetValueType() == Value::eValueTypeHostAddress &&
-        arg_value->GetContextType() == Value::eContextTypeInvalid &&
+    if (arg_value->GetValueType() == Value::ValueType::HostAddress &&
+        arg_value->GetContextType() == Value::ContextType::Invalid &&
         arg_value->GetCompilerType().IsPointerType())
       continue;
 
@@ -295,7 +295,7 @@
     return false;
 
   ret_value.SetCompilerType(m_function_return_type);
-  ret_value.SetValueType(Value::eValueTypeScalar);
+  ret_value.SetValueType(Value::ValueType::Scalar);
   return true;
 }
 
Index: lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
===================================================================
--- lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
+++ lldb/source/Plugins/ABI/AArch64/ABIMacOSX_arm64.cpp
@@ -654,7 +654,7 @@
 
   const uint32_t type_flags = return_compiler_type.GetTypeInfo(nullptr);
   if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) {
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
 
     bool success = false;
     if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) {
Index: lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
===================================================================
--- lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
+++ lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
@@ -622,7 +622,7 @@
 
   const uint32_t type_flags = return_compiler_type.GetTypeInfo(nullptr);
   if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) {
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
 
     bool success = false;
     if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) {
Index: lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
===================================================================
--- lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
+++ lldb/source/Plugins/ABI/X86/ABISysV_i386.cpp
@@ -378,14 +378,14 @@
     uint32_t ptr =
         thread.GetRegisterContext()->ReadRegisterAsUnsigned(eax_id, 0) &
         0xffffffff;
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     value.GetScalar() = ptr;
     return_valobj_sp = ValueObjectConstResult::Create(
         thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));
   } else if ((type_flags & eTypeIsScalar) ||
              (type_flags & eTypeIsEnumeration)) //'Integral' + 'Floating Point'
   {
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     llvm::Optional<uint64_t> byte_size =
         return_compiler_type.GetByteSize(&thread);
     if (!byte_size)
@@ -453,7 +453,7 @@
       uint32_t enm =
           thread.GetRegisterContext()->ReadRegisterAsUnsigned(eax_id, 0) &
           0xffffffff;
-      value.SetValueType(Value::eValueTypeScalar);
+      value.SetValueType(Value::ValueType::Scalar);
       value.GetScalar() = enm;
       return_valobj_sp = ValueObjectConstResult::Create(
           thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));
Index: lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
===================================================================
--- lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
+++ lldb/source/Plugins/ABI/X86/ABISysV_x86_64.cpp
@@ -399,7 +399,7 @@
 
   const uint32_t type_flags = return_compiler_type.GetTypeInfo();
   if (type_flags & eTypeIsScalar) {
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
 
     bool success = false;
     if (type_flags & eTypeIsInteger) {
@@ -487,7 +487,7 @@
     value.GetScalar() =
         (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(rax_id,
                                                                       0);
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     return_valobj_sp = ValueObjectConstResult::Create(
         thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));
   } else if (type_flags & eTypeIsVector) {
Index: lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
===================================================================
--- lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
+++ lldb/source/Plugins/ABI/X86/ABIWindows_x86_64.cpp
@@ -408,7 +408,7 @@
 
   const uint32_t type_flags = return_compiler_type.GetTypeInfo();
   if (type_flags & eTypeIsScalar) {
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
 
     bool success = false;
     if (type_flags & eTypeIsInteger) {
@@ -494,7 +494,7 @@
     value.GetScalar() =
         (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(rax_id,
                                                                       0);
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     return_valobj_sp = ValueObjectConstResult::Create(
         thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));
   } else if (type_flags & eTypeIsVector) {
Index: lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOS.cpp
===================================================================
--- lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOS.cpp
+++ lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOS.cpp
@@ -244,18 +244,18 @@
         clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
             lldb::eEncodingUint, 32);
 
-    mode_value.SetValueType(Value::eValueTypeScalar);
+    mode_value.SetValueType(Value::ValueType::Scalar);
     mode_value.SetCompilerType(clang_uint32_type);
 
     if (process->GetTarget().GetArchitecture().GetAddressByteSize() == 4) {
-      count_value.SetValueType(Value::eValueTypeScalar);
+      count_value.SetValueType(Value::ValueType::Scalar);
       count_value.SetCompilerType(clang_uint32_type);
     } else {
-      count_value.SetValueType(Value::eValueTypeScalar);
+      count_value.SetValueType(Value::ValueType::Scalar);
       count_value.SetCompilerType(clang_uint64_type);
     }
 
-    headers_value.SetValueType(Value::eValueTypeScalar);
+    headers_value.SetValueType(Value::ValueType::Scalar);
     headers_value.SetCompilerType(clang_void_ptr_type);
 
     argument_values.PushValue(mode_value);
Index: lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.cpp
===================================================================
--- lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.cpp
+++ lldb/source/Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.cpp
@@ -355,7 +355,7 @@
     CompilerType clang_uint32_type =
         clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
             lldb::eEncodingUint, 32);
-    input_value.SetValueType(Value::eValueTypeScalar);
+    input_value.SetValueType(Value::ValueType::Scalar);
     input_value.SetCompilerType(clang_uint32_type);
     //        input_value.SetContext (Value::eContextTypeClangType,
     //        clang_uint32_type);
Index: lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
===================================================================
--- lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
+++ lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
@@ -1493,7 +1493,7 @@
     if (var_location_expr.GetExpressionData(const_value_extractor)) {
       var_location = Value(const_value_extractor.GetDataStart(),
                            const_value_extractor.GetByteSize());
-      var_location.SetValueType(Value::eValueTypeHostAddress);
+      var_location.SetValueType(Value::ValueType::HostAddress);
     } else {
       LLDB_LOG(log, "Error evaluating constant variable: {0}", err.AsCString());
       return false;
@@ -1512,10 +1512,10 @@
   if (parser_type)
     *parser_type = TypeFromParser(type_to_use);
 
-  if (var_location.GetContextType() == Value::eContextTypeInvalid)
+  if (var_location.GetContextType() == Value::ContextType::Invalid)
     var_location.SetCompilerType(type_to_use);
 
-  if (var_location.GetValueType() == Value::eValueTypeFileAddress) {
+  if (var_location.GetValueType() == Value::ValueType::FileAddress) {
     SymbolContext var_sc;
     var->CalculateSymbolContext(&var_sc);
 
@@ -1529,7 +1529,7 @@
 
     if (load_addr != LLDB_INVALID_ADDRESS) {
       var_location.GetScalar() = load_addr;
-      var_location.SetValueType(Value::eValueTypeLoadAddress);
+      var_location.SetValueType(Value::ValueType::LoadAddress);
     }
   }
 
@@ -1665,11 +1665,11 @@
   const Address symbol_address = symbol.GetAddress();
   lldb::addr_t symbol_load_addr = symbol_address.GetLoadAddress(target);
 
-  // parser_vars->m_lldb_value.SetContext(Value::eContextTypeClangType,
+  // parser_vars->m_lldb_value.SetContext(Value::ContextType::ClangType,
   // user_type.GetOpaqueQualType());
   parser_vars->m_lldb_value.SetCompilerType(user_type);
   parser_vars->m_lldb_value.GetScalar() = symbol_load_addr;
-  parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
+  parser_vars->m_lldb_value.SetValueType(Value::ValueType::LoadAddress);
 
   parser_vars->m_named_decl = var_decl;
   parser_vars->m_llvm_value = nullptr;
@@ -1860,14 +1860,14 @@
       entity->GetParserVars(GetParserID());
 
   if (load_addr != LLDB_INVALID_ADDRESS) {
-    parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
+    parser_vars->m_lldb_value.SetValueType(Value::ValueType::LoadAddress);
     parser_vars->m_lldb_value.GetScalar() = load_addr;
   } else {
     // We have to try finding a file address.
 
     lldb::addr_t file_addr = fun_address.GetFileAddress();
 
-    parser_vars->m_lldb_value.SetValueType(Value::eValueTypeFileAddress);
+    parser_vars->m_lldb_value.SetValueType(Value::ValueType::FileAddress);
     parser_vars->m_lldb_value.GetScalar() = file_addr;
   }
 
Index: lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
+++ lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
@@ -196,7 +196,7 @@
   //
 
   class_type_or_name.Clear();
-  value_type = Value::ValueType::eValueTypeScalar;
+  value_type = Value::ValueType::Scalar;
 
   // Only a pointer or reference type can have a different dynamic and static
   // type:
Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV1.cpp
@@ -49,7 +49,7 @@
     TypeAndOrName &class_type_or_name, Address &address,
     Value::ValueType &value_type) {
   class_type_or_name.Clear();
-  value_type = Value::ValueType::eValueTypeScalar;
+  value_type = Value::ValueType::Scalar;
   if (CouldHaveDynamicValue(in_value)) {
     auto class_descriptor(GetClassDescriptor(in_value));
     if (class_descriptor && class_descriptor->IsValid() &&
Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -451,7 +451,7 @@
     assert(in_value.GetTargetSP().get() == m_process->CalculateTarget().get());
 
   class_type_or_name.Clear();
-  value_type = Value::ValueType::eValueTypeScalar;
+  value_type = Value::ValueType::Scalar;
 
   // Make sure we can have a dynamic value before starting...
   if (CouldHaveDynamicValue(in_value)) {
@@ -1346,12 +1346,12 @@
 
     // Next make the runner function for our implementation utility function.
     Value value;
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     value.SetCompilerType(clang_void_pointer_type);
     arguments.PushValue(value);
     arguments.PushValue(value);
 
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     value.SetCompilerType(clang_uint32_t_type);
     arguments.PushValue(value);
     arguments.PushValue(value);
@@ -1420,7 +1420,7 @@
     options.SetIsForUtilityExpr(true);
 
     Value return_value;
-    return_value.SetValueType(Value::eValueTypeScalar);
+    return_value.SetValueType(Value::ValueType::Scalar);
     return_value.SetCompilerType(clang_uint32_t_type);
     return_value.GetScalar() = 0;
 
@@ -1628,12 +1628,12 @@
 
     // Next make the function caller for our implementation utility function.
     Value value;
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     value.SetCompilerType(clang_void_pointer_type);
     arguments.PushValue(value);
     arguments.PushValue(value);
 
-    value.SetValueType(Value::eValueTypeScalar);
+    value.SetValueType(Value::ValueType::Scalar);
     value.SetCompilerType(clang_uint32_t_type);
     arguments.PushValue(value);
     arguments.PushValue(value);
@@ -1698,7 +1698,7 @@
     options.SetIsForUtilityExpr(true);
 
     Value return_value;
-    return_value.SetValueType(Value::eValueTypeScalar);
+    return_value.SetValueType(Value::ValueType::Scalar);
     return_value.SetCompilerType(clang_uint32_t_type);
     return_value.GetScalar() = 0;
 
Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
@@ -526,7 +526,7 @@
     CompilerType clang_void_ptr_type =
         clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
 
-    input_value.SetValueType(Value::eValueTypeScalar);
+    input_value.SetValueType(Value::ValueType::Scalar);
     // input_value.SetContext (Value::eContextTypeClangType,
     // clang_void_ptr_type);
     input_value.SetCompilerType(clang_void_ptr_type);
@@ -936,7 +936,7 @@
     Value void_ptr_value;
     CompilerType clang_void_ptr_type =
         clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
-    void_ptr_value.SetValueType(Value::eValueTypeScalar);
+    void_ptr_value.SetValueType(Value::ValueType::Scalar);
     // void_ptr_value.SetContext (Value::eContextTypeClangType,
     // clang_void_ptr_type);
     void_ptr_value.SetCompilerType(clang_void_ptr_type);
@@ -1048,7 +1048,7 @@
 
       Value isa_value(*(argument_values.GetValueAtIndex(obj_index)));
 
-      isa_value.SetValueType(Value::eValueTypeLoadAddress);
+      isa_value.SetValueType(Value::ValueType::LoadAddress);
       isa_value.ResolveValue(&exe_ctx);
       if (isa_value.GetScalar().IsValid()) {
         isa_addr = isa_value.GetScalar().ULongLong();
@@ -1110,7 +1110,7 @@
       CompilerType clang_int_type =
           clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
               lldb::eEncodingSint, 32);
-      flag_value.SetValueType(Value::eValueTypeScalar);
+      flag_value.SetValueType(Value::ValueType::Scalar);
       // flag_value.SetContext (Value::eContextTypeClangType, clang_int_type);
       flag_value.SetCompilerType(clang_int_type);
 
Index: lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
===================================================================
--- lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
+++ lldb/source/Plugins/Platform/POSIX/PlatformPOSIX.cpp
@@ -659,7 +659,7 @@
   // We are passing four arguments, the basename, the list of places to look,
   // a buffer big enough for all the path + name combos, and
   // a pointer to the storage we've made for the result:
-  value.SetValueType(Value::eValueTypeScalar);
+  value.SetValueType(Value::ValueType::Scalar);
   value.SetCompilerType(clang_void_pointer_type);
   arguments.PushValue(value);
   value.SetCompilerType(clang_char_pointer_type);
Index: lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
===================================================================
--- lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -1784,7 +1784,7 @@
                 if (location.Evaluate(nullptr, LLDB_INVALID_ADDRESS, nullptr,
                                       nullptr, location_result, &error)) {
                   if (location_result.GetValueType() ==
-                      Value::eValueTypeFileAddress) {
+                      Value::ValueType::FileAddress) {
                     lldb::addr_t file_addr =
                         location_result.GetScalar().ULongLong();
                     lldb::addr_t byte_size = 1;
Index: lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.cpp
===================================================================
--- lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.cpp
+++ lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetItemInfoHandler.cpp
@@ -258,26 +258,26 @@
   CompilerType clang_void_ptr_type =
       clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
   Value return_buffer_ptr_value;
-  return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar);
+  return_buffer_ptr_value.SetValueType(Value::ValueType::Scalar);
   return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type);
 
   CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt);
   Value debug_value;
-  debug_value.SetValueType(Value::eValueTypeScalar);
+  debug_value.SetValueType(Value::ValueType::Scalar);
   debug_value.SetCompilerType(clang_int_type);
 
   CompilerType clang_uint64_type =
       clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong);
   Value item_value;
-  item_value.SetValueType(Value::eValueTypeScalar);
+  item_value.SetValueType(Value::ValueType::Scalar);
   item_value.SetCompilerType(clang_uint64_type);
 
   Value page_to_free_value;
-  page_to_free_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_value.SetCompilerType(clang_void_ptr_type);
 
   Value page_to_free_size_value;
-  page_to_free_size_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_size_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_size_value.SetCompilerType(clang_uint64_type);
 
   std::lock_guard<std::mutex> guard(m_get_item_info_retbuffer_mutex);
Index: lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp
===================================================================
--- lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp
+++ lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp
@@ -261,26 +261,26 @@
   CompilerType clang_void_ptr_type =
       clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
   Value return_buffer_ptr_value;
-  return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar);
+  return_buffer_ptr_value.SetValueType(Value::ValueType::Scalar);
   return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type);
 
   CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt);
   Value debug_value;
-  debug_value.SetValueType(Value::eValueTypeScalar);
+  debug_value.SetValueType(Value::ValueType::Scalar);
   debug_value.SetCompilerType(clang_int_type);
 
   CompilerType clang_uint64_type =
       clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong);
   Value queue_value;
-  queue_value.SetValueType(Value::eValueTypeScalar);
+  queue_value.SetValueType(Value::ValueType::Scalar);
   queue_value.SetCompilerType(clang_uint64_type);
 
   Value page_to_free_value;
-  page_to_free_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_value.SetCompilerType(clang_void_ptr_type);
 
   Value page_to_free_size_value;
-  page_to_free_size_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_size_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_size_value.SetCompilerType(clang_uint64_type);
 
   std::lock_guard<std::mutex> guard(m_get_pending_items_retbuffer_mutex);
Index: lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
===================================================================
--- lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
+++ lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp
@@ -264,22 +264,22 @@
   CompilerType clang_void_ptr_type =
       clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
   Value return_buffer_ptr_value;
-  return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar);
+  return_buffer_ptr_value.SetValueType(Value::ValueType::Scalar);
   return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type);
 
   CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt);
   Value debug_value;
-  debug_value.SetValueType(Value::eValueTypeScalar);
+  debug_value.SetValueType(Value::ValueType::Scalar);
   debug_value.SetCompilerType(clang_int_type);
 
   Value page_to_free_value;
-  page_to_free_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_value.SetCompilerType(clang_void_ptr_type);
 
   CompilerType clang_uint64_type =
       clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong);
   Value page_to_free_size_value;
-  page_to_free_size_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_size_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_size_value.SetCompilerType(clang_uint64_type);
 
   std::lock_guard<std::mutex> guard(m_get_queues_retbuffer_mutex);
Index: lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
===================================================================
--- lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
+++ lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
@@ -262,26 +262,26 @@
   CompilerType clang_void_ptr_type =
       clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
   Value return_buffer_ptr_value;
-  return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar);
+  return_buffer_ptr_value.SetValueType(Value::ValueType::Scalar);
   return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type);
 
   CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt);
   Value debug_value;
-  debug_value.SetValueType(Value::eValueTypeScalar);
+  debug_value.SetValueType(Value::ValueType::Scalar);
   debug_value.SetCompilerType(clang_int_type);
 
   CompilerType clang_uint64_type =
       clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong);
   Value thread_id_value;
-  thread_id_value.SetValueType(Value::eValueTypeScalar);
+  thread_id_value.SetValueType(Value::ValueType::Scalar);
   thread_id_value.SetCompilerType(clang_uint64_type);
 
   Value page_to_free_value;
-  page_to_free_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_value.SetCompilerType(clang_void_ptr_type);
 
   Value page_to_free_size_value;
-  page_to_free_size_value.SetValueType(Value::eValueTypeScalar);
+  page_to_free_size_value.SetValueType(Value::ValueType::Scalar);
   page_to_free_size_value.SetCompilerType(clang_uint64_type);
 
   std::lock_guard<std::mutex> guard(m_get_thread_item_info_retbuffer_mutex);
Index: lldb/source/Target/ABI.cpp
===================================================================
--- lldb/source/Target/ABI.cpp
+++ lldb/source/Target/ABI.cpp
@@ -120,11 +120,13 @@
     const Value &result_value = live_valobj_sp->GetValue();
 
     switch (result_value.GetValueType()) {
-    case Value::eValueTypeHostAddress:
-    case Value::eValueTypeFileAddress:
-      // we don't do anything with these for now
+    case Value::ValueType::Invalid:
+      return {};
+    case Value::ValueType::HostAddress:
+    case Value::ValueType::FileAddress:
+      // we odon't do anything with these for now
       break;
-    case Value::eValueTypeScalar:
+    case Value::ValueType::Scalar:
       expr_variable_sp->m_flags |=
           ExpressionVariable::EVIsFreezeDried;
       expr_variable_sp->m_flags |=
@@ -132,7 +134,7 @@
       expr_variable_sp->m_flags |=
           ExpressionVariable::EVNeedsAllocation;
       break;
-    case Value::eValueTypeLoadAddress:
+    case Value::ValueType::LoadAddress:
       expr_variable_sp->m_live_sp = live_valobj_sp;
       expr_variable_sp->m_flags |=
           ExpressionVariable::EVIsProgramReference;
Index: lldb/source/Target/RegisterContextUnwind.cpp
===================================================================
--- lldb/source/Target/RegisterContextUnwind.cpp
+++ lldb/source/Target/RegisterContextUnwind.cpp
@@ -1521,7 +1521,7 @@
     DWARFExpression dwarfexpr(opcode_ctx, dwarfdata, nullptr);
     dwarfexpr.SetRegisterKind(unwindplan_registerkind);
     Value cfa_val = Scalar(m_cfa);
-    cfa_val.SetValueType(Value::eValueTypeLoadAddress);
+    cfa_val.SetValueType(Value::ValueType::LoadAddress);
     Value result;
     Status error;
     if (dwarfexpr.Evaluate(&exe_ctx, this, 0, &cfa_val, nullptr, result,
Index: lldb/source/Target/ThreadPlanTracer.cpp
===================================================================
--- lldb/source/Target/ThreadPlanTracer.cpp
+++ lldb/source/Target/ThreadPlanTracer.cpp
@@ -191,7 +191,7 @@
 
     for (int arg_index = 0; arg_index < num_args; ++arg_index) {
       Value value;
-      value.SetValueType(Value::eValueTypeScalar);
+      value.SetValueType(Value::ValueType::Scalar);
       value.SetCompilerType(intptr_type);
       value_list.PushValue(value);
     }
Index: lldb/unittests/Expression/DWARFExpressionTest.cpp
===================================================================
--- lldb/unittests/Expression/DWARFExpressionTest.cpp
+++ lldb/unittests/Expression/DWARFExpressionTest.cpp
@@ -34,9 +34,9 @@
     return status.ToError();
 
   switch (result.GetValueType()) {
-  case Value::eValueTypeScalar:
+  case Value::ValueType::Scalar:
     return result.GetScalar();
-  case Value::eValueTypeHostAddress: {
+  case Value::ValueType::HostAddress: {
     // Convert small buffers to scalars to simplify the tests.
     DataBufferHeap &buf = result.GetBuffer();
     if (buf.GetByteSize() <= 8) {