source: trunk/abcl/src/org/armedbear/lisp/Layout.java @ 12517

Last change on this file since 12517 was 12513, checked in by ehuelsmann, 15 years ago

Remove 'private' keyword to eliminate the Java requirement

for the compiler to generate synthetic accessors: functions that
don't appear in the source but do appear in the class file.

Patch by: Douglas Miles <dmiles _at_ users.sf.net>

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 7.7 KB
Line 
1/*
2 * Layout.java
3 *
4 * Copyright (C) 2003-2006 Peter Graves
5 * $Id: Layout.java 12513 2010-03-02 22:35:36Z ehuelsmann $
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20 *
21 * As a special exception, the copyright holders of this library give you
22 * permission to link this library with independent modules to produce an
23 * executable, regardless of the license terms of these independent
24 * modules, and to copy and distribute the resulting executable under
25 * terms of your choice, provided that you also meet, for each linked
26 * independent module, the terms and conditions of the license of that
27 * module.  An independent module is a module which is not derived from
28 * or based on this library.  If you modify this library, you may extend
29 * this exception to your version of the library, but you are not
30 * obligated to do so.  If you do not wish to do so, delete this
31 * exception statement from your version.
32 */
33
34package org.armedbear.lisp;
35
36import static org.armedbear.lisp.Lisp.*;
37
38public class Layout extends LispObject
39{
40  private final LispClass lispClass;
41  public final EqHashTable slotTable;
42
43  final LispObject[] slotNames;
44  final LispObject sharedSlots;
45
46  private boolean invalid;
47
48  public Layout(LispClass lispClass, LispObject instanceSlots, LispObject sharedSlots)
49  {
50    this.lispClass = lispClass;
51    Debug.assertTrue(instanceSlots.listp());
52    int length = instanceSlots.length();
53    slotNames = new LispObject[length];
54    int i = 0;
55
56    while (instanceSlots != NIL)
57      {
58        slotNames[i++] = instanceSlots.car();
59        instanceSlots = instanceSlots.cdr();
60      }
61
62    Debug.assertTrue(i == length);
63    this.sharedSlots = sharedSlots;
64    slotTable = initializeSlotTable(slotNames);
65  }
66
67  public Layout(LispClass lispClass, LispObject[] instanceSlotNames,
68                LispObject sharedSlots)
69  {
70    this.lispClass = lispClass;
71    this.slotNames = instanceSlotNames;
72    this.sharedSlots = sharedSlots;
73    slotTable = initializeSlotTable(slotNames);
74  }
75
76  // Copy constructor.
77  Layout(Layout oldLayout)
78  {
79    lispClass = oldLayout.getLispClass();
80    slotNames = oldLayout.slotNames;
81    sharedSlots = oldLayout.sharedSlots;
82    slotTable = initializeSlotTable(slotNames);
83  }
84
85  private EqHashTable initializeSlotTable(LispObject[] slotNames)
86  {
87    EqHashTable ht = new EqHashTable(slotNames.length, NIL, NIL);
88    for (int i = slotNames.length; i-- > 0;)
89      ht.put(slotNames[i], Fixnum.getInstance(i));
90    return ht;
91  }
92
93  @Override
94  public LispObject getParts()
95  {
96    LispObject result = NIL;
97    result = result.push(new Cons("class", getLispClass()));
98    for (int i = 0; i < slotNames.length; i++)
99      {
100        result = result.push(new Cons("slot " + i, slotNames[i]));
101      }
102    result = result.push(new Cons("shared slots", sharedSlots));
103    return result.nreverse();
104  }
105
106  public LispClass getLispClass()
107  {
108    return lispClass;
109  }
110
111  public boolean isInvalid()
112  {
113    return invalid;
114  }
115
116  public void invalidate()
117  {
118    invalid = true;
119  }
120
121  public LispObject[] getSlotNames()
122  {
123    return slotNames;
124  }
125
126  public int getLength()
127  {
128    return slotNames.length;
129  }
130
131  public LispObject getSharedSlots()
132  {
133    return sharedSlots;
134  }
135
136  @Override
137  public String writeToString()
138  {
139    return unreadableString(Symbol.LAYOUT);
140  }
141
142  // Generates a list of slot definitions for the slot names in this layout.
143  protected LispObject generateSlotDefinitions()
144  {
145    LispObject list = NIL;
146    for (int i = slotNames.length; i-- > 0;)
147      list = list.push(new SlotDefinition(slotNames[i], NIL));
148
149    return list;
150  }
151
152  // ### make-layout
153  private static final Primitive MAKE_LAYOUT =
154    new Primitive("make-layout", PACKAGE_SYS, true,
155                  "class instance-slots class-slots")
156    {
157      @Override
158      public LispObject execute(LispObject first, LispObject second,
159                                LispObject third)
160
161      {
162          return new Layout(checkClass(first), checkList(second),
163                              checkList(third));
164      }
165
166    };
167
168  // ### layout-class
169  private static final Primitive LAYOUT_CLASS =
170    new Primitive("layout-class", PACKAGE_SYS, true, "layout")
171    {
172      @Override
173      public LispObject execute(LispObject arg)
174      {
175          return checkLayout(arg).getLispClass();
176      }
177    };
178
179  // ### layout-length
180  private static final Primitive LAYOUT_LENGTH =
181    new Primitive("layout-length", PACKAGE_SYS, true, "layout")
182    {
183      @Override
184      public LispObject execute(LispObject arg)
185      {
186          return Fixnum.getInstance(checkLayout(arg).slotNames.length);
187      }
188    };
189
190  public int getSlotIndex(LispObject slotName)
191  {
192    LispObject index = slotTable.get(slotName);
193    if (index != null)
194      return ((Fixnum)index).value;
195    return -1;
196  }
197
198  public LispObject getSharedSlotLocation(LispObject slotName)
199
200  {
201    LispObject rest = sharedSlots;
202    while (rest != NIL)
203      {
204        LispObject location = rest.car();
205        if (location.car() == slotName)
206          return location;
207        rest = rest.cdr();
208      }
209    return null;
210  }
211
212  // ### layout-slot-index layout slot-name => index
213  private static final Primitive LAYOUT_SLOT_INDEX =
214    new Primitive("layout-slot-index", PACKAGE_SYS, true)
215    {
216      @Override
217      public LispObject execute(LispObject first, LispObject second)
218
219      {
220          final LispObject slotNames[] = checkLayout(first).slotNames;
221          for (int i = slotNames.length; i-- > 0;)
222            {
223              if (slotNames[i] == second)
224                return Fixnum.getInstance(i);
225            }
226          return NIL;
227      }
228    };
229
230  // ### layout-slot-location layout slot-name => location
231  private static final Primitive LAYOUT_SLOT_LOCATION =
232    new Primitive("layout-slot-location", PACKAGE_SYS, true, "layout slot-name")
233    {
234      @Override
235      public LispObject execute(LispObject first, LispObject second)
236
237      {
238                final Layout layOutFirst = checkLayout(first);
239            final LispObject slotNames[] = layOutFirst.slotNames;
240            final int limit = slotNames.length;
241            for (int i = 0; i < limit; i++)
242              {
243                if (slotNames[i] == second)
244                  return Fixnum.getInstance(i);
245              }
246            // Reaching here, it's not an instance slot.
247            LispObject rest = layOutFirst.sharedSlots;
248            while (rest != NIL)
249              {
250                LispObject location = rest.car();
251                if (location.car() == second)
252                  return location;
253                rest = rest.cdr();
254              }
255            return NIL;
256          }
257    };
258
259  // ### %make-instances-obsolete class => class
260  private static final Primitive _MAKE_INSTANCES_OBSOLETE =
261    new Primitive("%make-instances-obsolete", PACKAGE_SYS, true, "class")
262    {
263      @Override
264      public LispObject execute(LispObject arg)
265      {
266        final LispClass lispClass = checkClass(arg);
267        Layout oldLayout = lispClass.getClassLayout();
268        Layout newLayout = new Layout(oldLayout);
269        lispClass.setClassLayout(newLayout);
270        oldLayout.invalidate();
271        return arg;
272      }
273    };
274}
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