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/*
* JavaClassLoader.java
*
* 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 java.io.InputStream;
import static org.armedbear.lisp.Lisp.*;
public class FaslClassLoader extends JavaClassLoader {
private final String baseName;
private final JavaObject boxedThis = new JavaObject(this);
public FaslClassLoader(String baseName) {
this.baseName = baseName;
}
@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 (name.startsWith(baseName + "_")) {
String internalName = name.replace(".", "/");
if (!internalName.contains("/")) internalName = "org/armedbear/lisp/" + internalName;
Class c = this.findLoadedClass(internalName);
if (c == null && checkPreCompiledClassLoader) {
c = findPrecompiledClassOrNull(name);
// Oh, we have to return here so we don't become the owning class loader?
if (c != null)
return c;
}
if (c == null) {
c = findClass(name);
}
if (c != null) {
if (resolve) {
resolveClass(c);
}
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);
}
}
@Override
public InputStream getResourceAsStream(String resourceName) {
final LispThread thread = LispThread.currentThread();
Pathname name = (Pathname)Pathname.create(resourceName.substring("org/armedbear/lisp/".length()));
LispObject truenameFasl = Symbol.LOAD_TRUENAME_FASL.symbolValue(thread);
LispObject truename = Symbol.LOAD_TRUENAME.symbolValue(thread);
if (truenameFasl instanceof Pathname) {
return (Pathname.mergePathnames(name, (Pathname)truenameFasl, Keyword.NEWEST))
.getInputStream();
} else if (truename instanceof Pathname) {
return (Pathname.mergePathnames(name, (Pathname) truename, Keyword.NEWEST))
.getInputStream();
} else if (!Symbol.PROBE_FILE.execute(name).equals(NIL)) {
return name.getInputStream();
}
return null;
}
public LispObject loadFunction(int fnNumber) {
//Function name is fnIndex + 1
String name = baseName + "_" + (fnNumber + 1);
try {
Class clz = loadClass(name);
Function f = (Function) clz.newInstance();
if (clz.getClassLoader() instanceof JavaClassLoader) {
// Don't do this for system classes (though probably dont need this for other classes)
f.setClassBytes(getFunctionClassBytes(name));
}
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 " + Symbol.LOAD_TRUENAME.symbolValue()));
}
}
private static final Primitive MAKE_FASL_CLASS_LOADER = new pf_make_fasl_class_loader();
private static final class pf_make_fasl_class_loader extends Primitive {
pf_make_fasl_class_loader() {
super("make-fasl-class-loader", PACKAGE_SYS, false, "base-name");
}
@Override
public LispObject execute(LispObject baseName) {
return new FaslClassLoader(baseName.getStringValue()).boxedThis;
}
};
private static final Primitive GET_FASL_FUNCTION = new pf_get_fasl_function();
private static final class pf_get_fasl_function extends Primitive {
pf_get_fasl_function() {
super("get-fasl-function", PACKAGE_SYS, false, "loader function-number");
}
@Override
public LispObject execute(LispObject loader, LispObject fnNumber) {
FaslClassLoader l = (FaslClassLoader) loader.javaInstance(FaslClassLoader.class);
return l.loadFunction(fnNumber.intValue());
}
};
}
