private bool IsSameTypeOrNullPtr(TypeAST typeToCheck, TypeAST typeAssign)
{
var nullType = Enum.GetName(typeof(Keyword), Keyword.NULL).ToLower();
var isSameType = typeToCheck.ToString() == typeAssign.ToString();
var isNullPtr = (typeToCheck.ToString().StartsWith("^") && typeAssign.ToString() == nullType);
return(isSameType || isNullPtr);
}
private string GetTypeOf(TypeAST currentType, TypeAST otherType)
{
if (currentType == null)
{
return(otherType.ToString());
}
return(ComputeType(currentType.ToString(), otherType.ToString()));
}
public override void Visit(NumberAST number)
{
var numberType = new TypeAST
{
TypeName = number.ExplicitType != string.Empty ?
number.ExplicitType :
Enum.GetName(typeof(Keyword), Keyword.S32).ToLower()
};
_stateInfo.currentType = numberType;
}
private TypeAST CastType(TypeAST currentType, TypeAST otherType)
{
var currentTypeString = currentType.ToString();
var otherTypeString = otherType.ToString();
if (currentTypeString == otherTypeString)
{
return(otherType);
}
if (otherType.ToString() == "[] char" && currentType.ToString() == "^char" ||
currentType.ToString() == "[] char" && otherType.ToString() == "^char")
{
return(otherType);
}
if ((Vocabulary.Types.All(x => x != currentTypeString) ||
Vocabulary.Types.All(x => x != otherTypeString)) &&
currentType.TypeName != "Enum" &&
otherType.TypeName != "Enum")
{
throw new Exception("Cannot Cast type " + currentTypeString + " to " + otherTypeString);
}
if (currentTypeString == "str" || otherTypeString == "str")
{
throw new Exception("Cannot Cast type " + currentTypeString + " to " + otherTypeString);
}
if (currentType.TypeName == "Enum" &&
(otherTypeString.StartsWith("u") || otherTypeString.StartsWith("s")))
{
return(otherType);
}
if (otherType.TypeName == "Enum" &&
(currentTypeString.StartsWith("u") || currentTypeString.StartsWith("s")))
{
return(otherType);
}
if (currentType.TypeName == "Enum" || otherType.TypeName == "Enum")
{
throw new Exception("Cannot Cast type " + currentTypeString + " to " + otherTypeString);
}
return(otherType);
}
public override void Visit(NewExprAST newStatement)
{
if (_stateInfo.isConst)
{
throw new Exception("Expression must be constant");
}
TypeAST type = newStatement.Type;
if (type is FunctionTypeAST)
{
throw new Exception("Cannot allocate a function type");
}
ArrayTypeAST arrayType;
while ((arrayType = type as ArrayTypeAST) != null)
{
type = arrayType.TypeOfContainedValues;
}
if (type.ToString().StartsWith("^"))
{
throw new Exception("Cannot allocate a pointer");
}
if (type.ToString() == Enum.GetName(typeof(Keyword), Keyword.VOID).ToLower())
{
throw new Exception("Cannot allocate void");
}
if (!(type is FunctionTypeAST) && !Vocabulary.Types.Contains(type.ToString()))
{
var typeExists = _symTableManager.LookupTypeInfo(_stateInfo.currentFile, type.ToString());
if (typeExists == null || typeExists.kind == TypeKind.ENUM)
{
throw new Exception(string.Format("New statement : type : {0} is not a struct", type.ToString()));
}
}
_stateInfo.currentType = new PtrTypeAST
{
Type = newStatement.Type,
TypeName = "Pointer"
};
}
public override void Visit(TypeAST type)
{
}
public virtual void Visit(TypeAST type)
{
}
public override void Visit(FunctionBodyAST functionBody)
{
Visit(functionBody.Prototype);
Visit(functionBody.Scope);
_returnType = null;
}
public override void Visit(FunctionProtoAST functionProto)
{
_returnType = functionProto.ReturnType;
}