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Common Lisp implementation running on the JVM
/*
* Layout.java
*
* Copyright (C) 2003-2006 Peter Graves
* $Id: Layout.java 13444 2011-08-06 13:51:26Z ehuelsmann $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
import java.util.concurrent.ConcurrentHashMap;
import static org.armedbear.lisp.Lisp.*;
public class Layout extends LispObject
{
private final LispObject lispClass;
public final ConcurrentHashMap slotTable;
final LispObject[] slotNames;
final LispObject sharedSlots;
private boolean invalid;
public Layout(LispObject lispClass, LispObject instanceSlots, LispObject sharedSlots)
{
this.lispClass = lispClass;
Debug.assertTrue(instanceSlots.listp());
int length = instanceSlots.length();
slotNames = new LispObject[length];
int i = 0;
while (instanceSlots != NIL)
{
slotNames[i++] = instanceSlots.car();
instanceSlots = instanceSlots.cdr();
}
Debug.assertTrue(i == length);
this.sharedSlots = sharedSlots;
slotTable = initializeSlotTable(slotNames);
}
public Layout(LispObject lispClass, LispObject[] instanceSlotNames,
LispObject sharedSlots)
{
this.lispClass = lispClass;
this.slotNames = instanceSlotNames;
this.sharedSlots = sharedSlots;
slotTable = initializeSlotTable(slotNames);
}
// Copy constructor.
Layout(Layout oldLayout)
{
lispClass = oldLayout.getLispClass();
slotNames = oldLayout.slotNames;
sharedSlots = oldLayout.sharedSlots;
slotTable = initializeSlotTable(slotNames);
}
private ConcurrentHashMap initializeSlotTable(LispObject[] slotNames)
{
ConcurrentHashMap ht = new ConcurrentHashMap(slotNames.length);
for (int i = slotNames.length; i-- > 0;)
ht.put(slotNames[i], Fixnum.getInstance(i));
return ht;
}
@Override
public LispObject getParts()
{
LispObject result = NIL;
result = result.push(new Cons("class", getLispClass()));
for (int i = 0; i < slotNames.length; i++)
{
result = result.push(new Cons("slot " + i, slotNames[i]));
}
result = result.push(new Cons("shared slots", sharedSlots));
return result.nreverse();
}
public LispObject getLispClass()
{
return lispClass;
}
public boolean isInvalid()
{
return invalid;
}
public void invalidate()
{
invalid = true;
}
public LispObject[] getSlotNames()
{
return slotNames;
}
public int getLength()
{
return slotNames.length;
}
public LispObject getSharedSlots()
{
return sharedSlots;
}
@Override
public String printObject()
{
return unreadableString("LAYOUT");
}
// Generates a list of slot definitions for the slot names in this layout.
protected LispObject generateSlotDefinitions()
{
LispObject list = NIL;
for (int i = slotNames.length; i-- > 0;)
list = list.push(new SlotDefinition(slotNames[i], NIL));
return list;
}
// ### make-layout
private static final Primitive MAKE_LAYOUT =
new Primitive("make-layout", PACKAGE_SYS, true,
"class instance-slots class-slots")
{
@Override
public LispObject execute(LispObject first, LispObject second,
LispObject third)
{
return new Layout(first, checkList(second), checkList(third));
}
};
// ### layout-class
private static final Primitive LAYOUT_CLASS =
new Primitive("layout-class", PACKAGE_SYS, true, "layout")
{
@Override
public LispObject execute(LispObject arg)
{
return checkLayout(arg).getLispClass();
}
};
// ### layout-length
private static final Primitive LAYOUT_LENGTH =
new Primitive("layout-length", PACKAGE_SYS, true, "layout")
{
@Override
public LispObject execute(LispObject arg)
{
return Fixnum.getInstance(checkLayout(arg).slotNames.length);
}
};
public int getSlotIndex(LispObject slotName)
{
LispObject index = slotTable.get(slotName);
if (index != null)
return ((Fixnum)index).value;
return -1;
}
public LispObject getSharedSlotLocation(LispObject slotName)
{
LispObject rest = sharedSlots;
while (rest != NIL)
{
LispObject location = rest.car();
if (location.car() == slotName)
return location;
rest = rest.cdr();
}
return null;
}
// ### layout-slot-index layout slot-name => index
private static final Primitive LAYOUT_SLOT_INDEX =
new Primitive("layout-slot-index", PACKAGE_SYS, true)
{
@Override
public LispObject execute(LispObject first, LispObject second)
{
final LispObject slotNames[] = checkLayout(first).slotNames;
for (int i = slotNames.length; i-- > 0;)
{
if (slotNames[i] == second)
return Fixnum.getInstance(i);
}
return NIL;
}
};
// ### layout-slot-location layout slot-name => location
private static final Primitive LAYOUT_SLOT_LOCATION =
new Primitive("layout-slot-location", PACKAGE_SYS, true, "layout slot-name")
{
@Override
public LispObject execute(LispObject first, LispObject second)
{
final Layout layOutFirst = checkLayout(first);
final LispObject slotNames[] = layOutFirst.slotNames;
final int limit = slotNames.length;
for (int i = 0; i < limit; i++)
{
if (slotNames[i] == second)
return Fixnum.getInstance(i);
}
// Reaching here, it's not an instance slot.
LispObject rest = layOutFirst.sharedSlots;
while (rest != NIL)
{
LispObject location = rest.car();
if (location.car() == second)
return location;
rest = rest.cdr();
}
return NIL;
}
};
// ### %make-instances-obsolete class => class
private static final Primitive _MAKE_INSTANCES_OBSOLETE =
new Primitive("%make-instances-obsolete", PACKAGE_SYS, true, "class")
{
@Override
public LispObject execute(LispObject arg)
{
final LispObject lispClass = arg;
LispObject oldLayout;
if (lispClass instanceof LispClass)
oldLayout = ((LispClass)lispClass).getClassLayout();
else
oldLayout = Symbol.CLASS_LAYOUT.execute(lispClass);
Layout newLayout = new Layout((Layout)oldLayout);
if (lispClass instanceof LispClass)
((LispClass)lispClass).setClassLayout(newLayout);
else
Symbol.CLASS_LAYOUT.getSymbolSetfFunction()
.execute(newLayout, lispClass);
((Layout)oldLayout).invalidate();
return arg;
}
};
}