From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/java/lang/VMClassLoader.java | 348 +++++++++++++++++++++++++++++++++++ 1 file changed, 348 insertions(+) create mode 100644 libjava/java/lang/VMClassLoader.java (limited to 'libjava/java/lang/VMClassLoader.java') diff --git a/libjava/java/lang/VMClassLoader.java b/libjava/java/lang/VMClassLoader.java new file mode 100644 index 000000000..21019b757 --- /dev/null +++ b/libjava/java/lang/VMClassLoader.java @@ -0,0 +1,348 @@ +/* VMClassLoader.java -- Reference implementation of native interface + required by ClassLoader + Copyright (C) 1998, 2001, 2002, 2003, 2004, 2005 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath 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, or (at your option) +any later version. + +GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +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 java.lang; + +import gnu.java.util.EmptyEnumeration; +import java.lang.reflect.Constructor; +import java.io.File; +import java.io.IOException; +import java.net.URL; +import java.net.URLClassLoader; +import java.security.AllPermission; +import java.security.Permission; +import java.security.Permissions; +import java.security.ProtectionDomain; +import java.util.ArrayList; +import java.util.Enumeration; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.StringTokenizer; +import gnu.gcj.runtime.BootClassLoader; + +/** + * java.lang.VMClassLoader is a package-private helper for VMs to implement + * on behalf of java.lang.ClassLoader. + * + * @author John Keiser + * @author Mark Wielaard + * @author Eric Blake + */ +final class VMClassLoader +{ + // Protection Domain definitions + // FIXME: should there be a special protection domain used for native code? + + // The permission required to check what a classes protection domain is. + static final Permission protectionDomainPermission + = new RuntimePermission("getProtectionDomain"); + // The protection domain returned if we cannot determine it. + static ProtectionDomain unknownProtectionDomain; + + static + { + Permissions permissions = new Permissions(); + permissions.add(new AllPermission()); + unknownProtectionDomain = new ProtectionDomain(null, permissions); + } + + static final HashMap definedPackages = new HashMap(); + + // This is a helper for handling java.endorsed.dirs. It is null + // until we've initialized the system, at which point it is created. + static BootClassLoader bootLoader; + + // This keeps track of shared libraries we've already tried to load. + private static HashSet tried_libraries; + + // Holds one of the LIB_* constants; used to determine how shared + // library loads are done. + private static int lib_control; + + private static final int LIB_FULL = 0; + private static final int LIB_CACHE = 1; + private static final int LIB_NEVER = 2; + + /** + * Helper to define a class using a string of bytes. This assumes that + * the security checks have already been performed, if necessary. + * + * For backward compatibility, this just ignores the protection + * domain; that is the wrong behavior, and you should directly implement + * this method natively if you can. + * + * @param name the name to give the class, or null if unknown + * @param data the data representing the classfile, in classfile format + * @param offset the offset into the data where the classfile starts + * @param len the length of the classfile data in the array + * @param pd the protection domain + * @return the class that was defined + * @throws ClassFormatError if data is not in proper classfile format + */ + static final native Class defineClass(ClassLoader cl, String name, + byte[] data, int offset, int len, + ProtectionDomain pd) + throws ClassFormatError; + + /** + * Helper to resolve all references to other classes from this class. + * + * @param c the class to resolve + */ + static final void resolveClass(Class clazz) + { + // There doesn't seem to be a need for this to do anything. + // Testing reveals that the JDK doesn't seem to do anything here, + // either. + } + + /** + * Helper to load a class from the bootstrap class loader. + * + * @param name the class name to load + * @param resolve whether to resolve it + * @return the class, loaded by the bootstrap classloader or null + * if the class wasn't found. Returning null is equivalent to throwing + * a ClassNotFoundException (but a possible performance optimization). + */ + static final native Class loadClass(String name, boolean resolve) + throws ClassNotFoundException; + + /** + * Helper to load a resource from the bootstrap class loader. + * + * In libgcj, this does nothing, as the default system loader knows + * how to find resources that have been linked in. + * + * @param name the resource to find + * @return the URL to the resource + */ + static URL getResource(String name) + { + if (bootLoader != null) + return bootLoader.bootGetResource(name); + return null; + } + + /** + * Helper to get a list of resources from the bootstrap class loader. + * + * In libgcj, this does nothing, as the default system loader knows + * how to find resources that have been linked in. + * + * @param name the resource to find + * @return an enumeration of resources + * @throws IOException if one occurs + */ + static Enumeration getResources(String name) throws IOException + { + if (bootLoader != null) + return bootLoader.bootGetResources(name); + return EmptyEnumeration.getInstance(); + } + + /** + * Helper to get a package from the bootstrap class loader. The default + * implementation of returning null may be adequate, or you may decide + * that this needs some native help. + * + * @param name the name to find + * @return the named package, if it exists + */ + static synchronized Package getPackage(String name) + { + return (Package) definedPackages.get(name); + } + + /** + * Helper to get all packages from the bootstrap class loader. The default + * implementation of returning an empty array may be adequate, or you may + * decide that this needs some native help. + * + * @return all named packages, if any exist + */ + static synchronized Package[] getPackages() + { + Package[] packages = new Package[definedPackages.size()]; + return (Package[]) definedPackages.values().toArray(packages); + } + + // Define a package for something loaded natively. + static synchronized void definePackageForNative(String className) + { + int lastDot = className.lastIndexOf('.'); + if (lastDot != -1) + { + String packageName = className.substring(0, lastDot); + if (getPackage(packageName) == null) + { + // FIXME: this assumes we're defining the core, which + // isn't necessarily so. We could detect this and set up + // appropriately. We could also look at a manifest file + // compiled into the .so. + Package p = new Package(packageName, + "Java Platform API Specification", + "GNU", "1.4", "gcj", "GNU", + null, // FIXME: gcj version. + null); + definedPackages.put(packageName, p); + } + } + } + + /** + * Helper for java.lang.Integer, Byte, etc to get the TYPE class + * at initialization time. The type code is one of the chars that + * represents the primitive type as in JNI. + * + *
    + *
  • 'Z' - boolean
    • + *
  • 'B' - byte
    • + *
  • 'C' - char
    • + *
  • 'D' - double
    • + *
  • 'F' - float
    • + *
  • 'I' - int
    • + *
  • 'J' - long
    • + *
  • 'S' - short
    • + *
  • 'V' - void
    • + *
+ * + * @param type the primitive type + * @return a "bogus" class representing the primitive type + */ + static final native Class getPrimitiveClass(char type); + + /** + * The system default for assertion status. This is used for all system + * classes (those with a null ClassLoader), as well as the initial value for + * every ClassLoader's default assertion status. + * + * XXX - Not implemented yet; this requires native help. + * + * @return the system-wide default assertion status + */ + static final boolean defaultAssertionStatus() + { + return true; + } + + /** + * The system default for package assertion status. This is used for all + * ClassLoader's packageAssertionStatus defaults. It must be a map of + * package names to Boolean.TRUE or Boolean.FALSE, with the unnamed package + * represented as a null key. + * + * XXX - Not implemented yet; this requires native help. + * + * @return a (read-only) map for the default packageAssertionStatus + */ + static final Map packageAssertionStatus() + { + return new HashMap(); + } + + /** + * The system default for class assertion status. This is used for all + * ClassLoader's classAssertionStatus defaults. It must be a map of + * class names to Boolean.TRUE or Boolean.FALSE + * + * XXX - Not implemented yet; this requires native help. + * + * @return a (read-only) map for the default classAssertionStatus + */ + static final Map classAssertionStatus() + { + return new HashMap(); + } + + static native ClassLoader getSystemClassLoaderInternal(); + + static native void initBootLoader(String libdir); + + static void initialize(String libdir) + { + initBootLoader(libdir); + + String p + = System.getProperty ("gnu.gcj.runtime.VMClassLoader.library_control", + ""); + if ("never".equals(p)) + lib_control = LIB_NEVER; + else if ("cache".equals(p)) + lib_control = LIB_CACHE; + else if ("full".equals(p)) + lib_control = LIB_FULL; + else + lib_control = LIB_NEVER; + + tried_libraries = new HashSet(); + } + + /** + * Possibly load a .so and search it for classes. + */ + static native Class nativeFindClass(String name); + + static ClassLoader getSystemClassLoader() + { + // This method is called as the initialization of systemClassLoader, + // so if there is a null value, this is the first call and we must check + // for java.system.class.loader. + String loader = System.getProperty("java.system.class.loader"); + ClassLoader default_sys = getSystemClassLoaderInternal(); + if (loader != null) + { + try + { + Class load_class = Class.forName(loader, true, default_sys); + Constructor c + = load_class.getConstructor(new Class[] { ClassLoader.class }); + default_sys + = (ClassLoader) c.newInstance(new Object[] { default_sys }); + } + catch (Exception ex) + { + throw new Error("Failed to load requested system classloader " + + loader, ex); + } + } + + return default_sys; + } +} -- cgit v1.2.3