author | jjg |
Mon, 20 May 2019 10:57:57 -0700 | |
changeset 54950 | 46ae54c3026d |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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package sun.jvm.hotspot; |
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import java.io.*; |
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import java.net.*; |
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import java.util.*; |
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import java.security.*; |
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/** |
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* SA uses native debugger back-end library - libsaproc.so on Unix platforms. |
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* Starting from 5.0, in Solaris & Linux JDK "libsaproc.so" is shipped with JDK |
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* and is kept jre/lib/cpu directory (where all other JDK platform libraries |
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* are kept). This implies that always that jre copy of libsaproc.so will be |
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* used and the copy of libsaproc.so built from SA sources here will not |
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* be used at all. We can override libsaproc.so using this class loader |
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* as System class loader using "java.system.class.loader" property. This |
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* class loader loads classes paths specified paths using the System property |
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* "java.class.path". Because, this class loader loads SA debugger classes |
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* (among other classes), JVM calls findLibrary override here. In this |
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* findLibrary, we first check the library in the directories specified through |
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* "sa.library.path" System property. This way updated/latest SA native library |
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* can be loaded instead of the one from JDK's jre/lib directory. |
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*/ |
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public class SALauncherLoader extends URLClassLoader { |
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/** |
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* Checks native libraries under directories specified using |
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* the System property "sa.library.path". |
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*/ |
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public String findLibrary(String name) { |
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name = System.mapLibraryName(name); |
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for (int i = 0; i < libpaths.length; i++) { |
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File file = new File(new File(libpaths[i]), name); |
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if (file.exists()) { |
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return file.getAbsolutePath(); |
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} |
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} |
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return null; |
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} |
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public SALauncherLoader(ClassLoader parent) { |
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super(getClassPath(), parent); |
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String salibpath = System.getProperty("sa.library.path"); |
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if (salibpath != null) { |
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libpaths = salibpath.split(File.pathSeparator); |
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} else { |
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libpaths = new String[0]; |
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} |
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} |
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/** |
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* Override loadClass so we can checkPackageAccess. |
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*/ |
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public synchronized Class loadClass(String name, boolean resolve) |
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throws ClassNotFoundException { |
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int i = name.lastIndexOf('.'); |
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if (i != -1) { |
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SecurityManager sm = System.getSecurityManager(); |
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if (sm != null) { |
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sm.checkPackageAccess(name.substring(0, i)); |
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} |
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} |
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Class clazz = findLoadedClass(name); |
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if (clazz != null) return clazz; |
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/* |
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* NOTE: Unlike 'usual' class loaders, we do *not* delegate to |
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* the parent loader first. We attempt to load the class |
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* ourselves first and use parent loader only if we can't load. |
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* This is because the parent of this loader is 'default' |
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* System loader that can 'see' all SA classes in classpath and |
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* so will load those if delegated. And if parent loads SA classes, |
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* then JVM won't call findNative override in this class. |
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*/ |
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try { |
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return findClass(name); |
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} catch (ClassNotFoundException cnfe) { |
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return (super.loadClass(name, resolve)); |
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} |
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} |
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/** |
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* allow any classes loaded from classpath to exit the VM. |
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*/ |
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protected PermissionCollection getPermissions(CodeSource codesource) { |
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PermissionCollection perms = super.getPermissions(codesource); |
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perms.add(new RuntimePermission("exitVM")); |
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return perms; |
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} |
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//-- Internals only below this point |
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private String[] libpaths; |
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private static URL[] getClassPath() { |
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final String s = System.getProperty("java.class.path"); |
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final File[] path = (s == null) ? new File[0] : getClassPath(s); |
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return pathToURLs(path); |
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} |
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private static URL[] pathToURLs(File[] path) { |
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URL[] urls = new URL[path.length]; |
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for (int i = 0; i < path.length; i++) { |
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urls[i] = getFileURL(path[i]); |
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} |
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return urls; |
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} |
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private static File[] getClassPath(String cp) { |
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String[] tmp = cp.split(File.pathSeparator); |
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File[] paths = new File[tmp.length]; |
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for (int i = 0; i < paths.length; i++) { |
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paths[i] = new File(tmp[i].equals("")? "." : tmp[i]); |
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} |
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return paths; |
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} |
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private static URL getFileURL(File file) { |
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try { |
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file = file.getCanonicalFile(); |
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} catch (IOException e) { |
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e.printStackTrace(); |
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} |
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try { |
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return file.toURI().toURL(); |
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} catch (MalformedURLException mue) { |
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throw new InternalError(mue.getMessage()); |
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} |
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} |
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} |