/*
* Jatha - a Common LISP-compatible LISP library in Java.
* Copyright (C) 1997-2005 Micheal Scott Hewett
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* For further information, please contact Micheal Hewett at
* hewett@cs.stanford.edu
*
*/
package org.jatha.machine;
import org.jatha.Jatha;
import org.jatha.dynatype.LispValue;
// @date Sat Feb 1 22:18:53 1997
/**
* opLD pushes the value of a local variable onto
* the S register and removes two values from the C register.
* The values on the C register are the constant 'LD'
* and the pair (i, j), which are indices into the
* value of the E register which is a list of lists.
* @see SECDMachine
* @author Micheal S. Hewett hewett@cs.stanford.edu
*/
class opLD extends SECDop
{
/**
* It calls <tt>SECDop()</tt> with the machine argument
* and the label of this instruction.
* @see SECDMachine
*/
//@author Micheal S. Hewett hewett@cs.stanford.edu
public opLD(Jatha lisp)
{
super(lisp, "LD");
}
public void Execute(SECDMachine machine)
{
LispValue indexes;
indexes = machine.C.value().second();
/*
System.err.println("----DEBUG----");
System.err.println(machine.E.value());
System.err.println(indexes);
System.err.println(getComponentAt(indexes,machine.E.value()));
System.err.println("-------------");
*/
/*
print(CREATE_SYMBOL("---DEBUG----"));
print(indexes);
print(symbol_value(E));
push(print(getComponentAt(indexes, symbol_value(E))), S);
print(CREATE_SYMBOL("-----------"));
*/
machine.S.push(getComponentAt(indexes, machine.E.value()));
machine.C.pop();
machine.C.pop();
}
public LispValue grindef(LispValue code, int indentAmount)
{
indent(indentAmount);
System.out.print(functionName);
indent(6);
code.second().internal_princ(System.out);
f_lisp.NEWLINE.internal_princ(System.out);
return code.cdr().cdr();
}
}