public Operand Visit(ILGenerator generator, PrimitiveNode literal)
{
// Take the raw value
var value = literal.Literal.Value;
// Return an immediate operand
return(new ImmediateOperand(OperandType.FromToken(literal.Literal), value));
}
protected Operand VarDefinitionNode(ILGenerator generator, VariableDefinitionNode vardecl)
{
foreach (var definition in vardecl.Definitions)
{
// Get the identifier name
var variableName = definition.Left.Value;
// Check if the symbol is already defined
if (generator.SymbolTable.SymbolIsDefinedInBlock(variableName))
{
throw new SymbolException($"Symbol {variableName} is already defined.");
}
// If it is a variable definition, emmit the code to resolve the right-hand side
var rhs = definition.Right?.Visit(generator);
// Get the variable type from the declaration
var type = OperandType.FromToken(vardecl.Information.Type);
if (type == OperandType.Auto)
{
// If variable is implicitly typed, the right-hand side expression is a must
if (rhs == null)
{
throw new AstWalkerException($"Implicitly-typed variable must be initialized");
}
// Take the type from the right hand side expression
type = rhs.Type;
}
// Create the new symbol for the variable
var symbol = generator.SymbolTable.NewSymbol(variableName, type);
generator.Emmit(new VarInstruction(symbol, type, rhs));
}
return(null);
}