For.java

package zinara.ast.instructions;
import zinara.code_generator.*;

import zinara.ast.expression.Expression;
import zinara.ast.expression.ListExp;
import zinara.ast.expression.Identifier;
import zinara.ast.type.Type;
import zinara.ast.type.ListType;
import zinara.exceptions.InvalidCodeException;
import zinara.exceptions.TypeClashException;
import zinara.symtable.SymTable;
import zinara.symtable.SymValue;

import java.io.IOException;

public class For extends Instruction{
    private Expression expr;
    public CodeBlock code;
    private String i; //Iteration variable name

    public For(String i, Expression ex, CodeBlock cb){
	this.i = i;
	this.code = cb;
	this.expr = ex;
    }

    public String getI(){
	return this.i;
    }

    public CodeBlock getCode(){
	return this.code;
    }

    public Expression getExpression(){
	return this.expr;
    }

    public String toString() {
	return "<For " + i + " in " + expr + ": " + code + ">";
    }   

    public void checkNoReturns(){
	code.checkNoReturns();
    }

    public void tox86(Genx86 generator)
	throws IOException,InvalidCodeException{
	Type listType = ((ListType)expr.type).getInsideType();
	SymValue iterVar = code.getSymTable().getSymbol(this.i);
	String exprAddr = generator.addrRegName(register);  //direccion del la lista
	String iteration_var = generator.regName(register+1, listType);
	String iteration_var_addr = iterVar.getArea();
	iteration_var_addr += iterVar.getOffset();

	expr.register = register;
	code.register = register+2;

	//save
	generator.write(generator.save(register+1));
	generator.write(generator.save(register+2));

	break_label = nextInst;

	if (expr instanceof Identifier)
	    ((Identifier)expr).currentDirection(generator);
	else if (expr instanceof ListExp)
	    expr.tox86(generator);
	else
	    throw new InvalidCodeException("For sobre algo que no es lista literal ni identificador tipo lista");

	for(int i = 0; i< ((ListType)expr.type).len(); ++i){
	    continue_label = generator.newLabel();
	    set_breaks_continues(code,break_label,continue_label);

	    //Muevo el siguiente valor de la lista un registro
	    //y de ahi a la direccion de la variable de iteracion
	    generator.write(generator.mov(iteration_var,"["+exprAddr+"]",listType));
	    generator.write(generator.mov("["+iteration_var_addr+"]",iteration_var,listType));

	    //Genero el codigo
	    code.tox86(generator);

	    generator.writeLabel(continue_label);
	    //Muevo exprAddr a apuntar a la siguiente posicion de la lista
	    generator.write(generator.add(exprAddr,Integer.toString(listType.size())));
	}

	//restore
	generator.write(generator.restore(register+2));
	generator.write(generator.restore(register+1));
    }
}