[TableGen] Add asserts to make sure default values match property type

This adds a few asserts to the property TableGen backend to prevent
mismatches between property types and their default values. This
would've prevented a copy-paste mistake we discovered downstream.

Author: JDevlieghere

lldb/include/lldb/Core/PropertiesBase.td

@@ -18,11 +18,13 @@ class Global {
 class DefaultTrue {
   int DefaultUnsignedValue = 1;
   bit HasDefaultUnsignedValue = 1;
+  bit HasDefaultBooleanValue = 1;
 }
 
 class DefaultFalse {
   int DefaultUnsignedValue = 0;
   bit HasDefaultUnsignedValue = 1;
+  bit HasDefaultBooleanValue = 1;
 }
 
 // Gives the property a default string value.

lldb/utils/TableGen/LLDBPropertyDefEmitter.cpp

@@ -46,6 +46,7 @@ static void emitProperty(Record *Property, raw_ostream &OS) {
   bool hasDefaultUnsignedValue = Property->getValue("HasDefaultUnsignedValue");
   bool hasDefaultEnumValue = Property->getValue("HasDefaultEnumValue");
   bool hasDefaultStringValue = Property->getValue("HasDefaultStringValue");
+  bool hasDefaultBooleanValue = Property->getValue("HasDefaultBooleanValue");
 
   // Guarantee that every property has a default value.
   assert((hasDefaultUnsignedValue || hasDefaultEnumValue ||
@@ -57,6 +58,21 @@ static void emitProperty(Record *Property, raw_ostream &OS) {
   assert(!(hasDefaultUnsignedValue && hasDefaultEnumValue) &&
          "Property cannot have both a unsigned and enum default value.");
 
+  // Guarantee that every boolean property has a boolean default value.
+  assert(!(Property->getValueAsString("Type") == "Boolean" &&
+           !hasDefaultBooleanValue) &&
+         "Boolean property must have a boolean default value.");
+
+  // Guarantee that every string property has a string default value.
+  assert(!(Property->getValueAsString("Type") == "String" &&
+           !hasDefaultStringValue) &&
+         "String property must have a string default value.");
+
+  // Guarantee that every enum property has an enum default value.
+  assert(
+      !(Property->getValueAsString("Type") == "Enum" && !hasDefaultEnumValue) &&
+      "Enum property must have a enum default value.");
+
   // Emit the default uint value.
   if (hasDefaultUnsignedValue) {
     OS << std::to_string(Property->getValueAsInt("DefaultUnsignedValue"));