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/*
* MemoryClassLoader.java
*
* Copyright (C) 2011 Erik Huelsmann
* Copyright (C) 2010 Alessio Stalla
* $Id$
*
* 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 static org.armedbear.lisp.Lisp.*;
import java.util.*;
public class MemoryClassLoader extends JavaClassLoader {
private final HashMap hashtable = new HashMap();
private final JavaObject boxedThis = new JavaObject(this);
private final String internalNamePrefix;
public MemoryClassLoader() {
this("org/armedbear/lisp/");
}
public MemoryClassLoader(String internalNamePrefix) {
this.internalNamePrefix = internalNamePrefix;
}
public MemoryClassLoader(JavaClassLoader parent) {
super(parent);
this.internalNamePrefix = "";
}
@Override
protected Class loadClass(String name, boolean resolve)
throws ClassNotFoundException {
/* First we check if we should load the class ourselves,
* allowing the default handlers to kick in if we don't...
*
* This strategy eliminates ClassNotFound exceptions inside
* the inherited loadClass() eliminated ~80k exceptions during
* Maxima compilation. Generally, creation of an exception object
* is a pretty heavy operation, because it processes the call stack,
* which - in ABCL - is pretty deep, most of the time.
*/
if (hashtable.containsKey(name)) {
String internalName = internalNamePrefix + name;
Class c = this.findLoadedClass(internalName);
if (c == null) {
c = findClass(name);
}
if (c != null) {
if (resolve) {
resolveClass(c);
}
return c;
}
}
if (checkPreCompiledClassLoader) {
Class c = findPrecompiledClassOrNull(name);
if (c != null) {
return c;
}
}
// Fall through to our super's default handling
return super.loadClass(name, resolve);
}
@Override
protected Class findClass(String name) throws ClassNotFoundException {
try {
if (checkPreCompiledClassLoader) {
Class c = findPrecompiledClassOrNull(name);
if (c != null)
return c;
}
byte[] b = getFunctionClassBytes(name);
return defineLispClass(name, b, 0, b.length);
} catch(Throwable e) { //TODO handle this better, readFunctionBytes uses Debug.assert() but should return null
e.printStackTrace();
if(e instanceof ControlTransfer) { throw (ControlTransfer) e; }
throw new ClassNotFoundException("Function class not found: " + name, e);
}
}
public byte[] getFunctionClassBytes(String name) {
if (hashtable.containsKey(name)) {
return (byte[])hashtable.get(name).javaInstance();
}
return super.getFunctionClassBytes(name);
}
public LispObject loadFunction(String name) {
try {
Class clz = loadClass(name);
Function f = (Function) clz.newInstance();
getFunctionClassBytes(f); //as a side effect it sets them
return f;
} catch(Throwable e) {
if(e instanceof ControlTransfer) { throw (ControlTransfer) e; }
Debug.trace(e);
return error(new LispError("Compiled function can't be loaded: " + name + " from memory"));
}
}
private static final Primitive MAKE_MEMORY_CLASS_LOADER = new pf_make_memory_class_loader();
private static final class pf_make_memory_class_loader extends Primitive {
pf_make_memory_class_loader() {
super("make-memory-class-loader", PACKAGE_SYS, false);
}
@Override
public LispObject execute() {
return new MemoryClassLoader().boxedThis;
}
};
public static final Primitive PUT_MEMORY_FUNCTION = new pf_put_memory_function();
private static final class pf_put_memory_function extends Primitive {
pf_put_memory_function() {
super("put-memory-function", PACKAGE_SYS, false, "loader class-name class-bytes");
}
@Override
public LispObject execute(LispObject loader, LispObject className, LispObject classBytes) {
MemoryClassLoader l = (MemoryClassLoader) loader.javaInstance(MemoryClassLoader.class);
return (LispObject)l.hashtable.put(className.getStringValue(), (JavaObject)classBytes);
}
};
private static final Primitive GET_MEMORY_FUNCTION = new pf_get_memory_function();
private static final class pf_get_memory_function extends Primitive {
pf_get_memory_function() {
super("get-memory-function", PACKAGE_SYS, false, "loader class-name");
}
@Override
public LispObject execute(LispObject loader, LispObject name) {
MemoryClassLoader l = (MemoryClassLoader) loader.javaInstance(MemoryClassLoader.class);
return l.loadFunction(name.getStringValue());
}
};
}
