| /* |
| * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot; |
| |
| import java.io.*; |
| import java.net.*; |
| import java.util.*; |
| import java.security.*; |
| |
| /** |
| * SA uses native debugger back-end library - libsaproc.so on Unix platforms. |
| * Starting from 5.0, in Solaris & Linux JDK "libsaproc.so" is shipped with JDK |
| * and is kept jre/lib/cpu directory (where all other JDK platform libraries |
| * are kept). This implies that always that jre copy of libsaproc.so will be |
| * used and the copy of libsaproc.so built from SA sources here will not |
| * be used at all. We can override libsaproc.so using this class loader |
| * as System class loader using "java.system.class.loader" property. This |
| * class loader loads classes paths specified paths using the System property |
| * "java.class.path". Because, this class loader loads SA debugger classes |
| * (among other classes), JVM calls findLibrary override here. In this |
| * findLibrary, we first check the library in the directories specified through |
| * "sa.library.path" System property. This way updated/latest SA native library |
| * can be loaded instead of the one from JDK's jre/lib directory. |
| */ |
| public class SALauncherLoader extends URLClassLoader { |
| |
| /** |
| * Checks native libraries under directories specified using |
| * the System property "sa.library.path". |
| */ |
| public String findLibrary(String name) { |
| name = System.mapLibraryName(name); |
| for (int i = 0; i < libpaths.length; i++) { |
| File file = new File(new File(libpaths[i]), name); |
| if (file.exists()) { |
| return file.getAbsolutePath(); |
| } |
| } |
| return null; |
| } |
| |
| public SALauncherLoader(ClassLoader parent) { |
| super(getClassPath(), parent); |
| String salibpath = System.getProperty("sa.library.path"); |
| if (salibpath != null) { |
| libpaths = salibpath.split(File.pathSeparator); |
| } else { |
| libpaths = new String[0]; |
| } |
| } |
| |
| /** |
| * Override loadClass so we can checkPackageAccess. |
| */ |
| public synchronized Class loadClass(String name, boolean resolve) |
| throws ClassNotFoundException { |
| int i = name.lastIndexOf('.'); |
| if (i != -1) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPackageAccess(name.substring(0, i)); |
| } |
| } |
| |
| Class clazz = findLoadedClass(name); |
| if (clazz != null) return clazz; |
| |
| /* |
| * NOTE: Unlike 'usual' class loaders, we do *not* delegate to |
| * the parent loader first. We attempt to load the class |
| * ourselves first and use parent loader only if we can't load. |
| * This is because the parent of this loader is 'default' |
| * System loader that can 'see' all SA classes in classpath and |
| * so will load those if delegated. And if parent loads SA classes, |
| * then JVM won't call findNative override in this class. |
| */ |
| try { |
| return findClass(name); |
| } catch (ClassNotFoundException cnfe) { |
| return (super.loadClass(name, resolve)); |
| } |
| } |
| |
| /** |
| * allow any classes loaded from classpath to exit the VM. |
| */ |
| protected PermissionCollection getPermissions(CodeSource codesource) { |
| PermissionCollection perms = super.getPermissions(codesource); |
| perms.add(new RuntimePermission("exitVM")); |
| return perms; |
| } |
| |
| //-- Internals only below this point |
| |
| private String[] libpaths; |
| |
| private static URL[] getClassPath() { |
| final String s = System.getProperty("java.class.path"); |
| final File[] path = (s == null) ? new File[0] : getClassPath(s); |
| |
| return pathToURLs(path); |
| } |
| |
| private static URL[] pathToURLs(File[] path) { |
| URL[] urls = new URL[path.length]; |
| for (int i = 0; i < path.length; i++) { |
| urls[i] = getFileURL(path[i]); |
| } |
| return urls; |
| } |
| |
| private static File[] getClassPath(String cp) { |
| String[] tmp = cp.split(File.pathSeparator); |
| File[] paths = new File[tmp.length]; |
| for (int i = 0; i < paths.length; i++) { |
| paths[i] = new File(tmp[i].equals("")? "." : tmp[i]); |
| } |
| return paths; |
| } |
| |
| private static URL getFileURL(File file) { |
| try { |
| file = file.getCanonicalFile(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| |
| try { |
| return file.toURI().toURL(); |
| } catch (MalformedURLException mue) { |
| throw new InternalError(mue.getMessage()); |
| } |
| } |
| } |