public List <Instruction> VisitExpression(object context, AstStatement.ExpressionStmt expressionStmt)
{
var instructions = expressionStmt.Expression.Accept(expressionStmt.Scope, this);
// pop return value if type is not void
if (expressionStmt.Expression.Type != DataTypes.Void)
{
if (expressionStmt.Expression.Type == DataTypes.Int)
{
instructions.Add(PopInt);
}
else
{
throw new NotImplementedException(
"invalid return type " + expressionStmt.Expression.Type);
}
}
return(instructions);
}
public void VisitExpression(IndentWriter context, AstStatement.ExpressionStmt expressionStmt)
{
this.PrintExpression(context, expressionStmt.Expression, expressionStmt.Scope);
}
public AstStatement VisitExpression(Scope context, AstStatement.ExpressionStmt expressionStmt)
{
expressionStmt.Expression = expressionStmt.Expression.Accept(context, this);
expressionStmt.Scope = context;
return(expressionStmt);
}
public Tree VisitExpression(object c, AstStatement.ExpressionStmt expressionStmt)
=> new Tree("stmt");