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riscv-gcc-1
Commit b9f42bb0 by Tom Tromey Committed by Tom Tromey
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Proxy.java (generate): Uncomment protection domain code. 

	* java/lang/reflect/Proxy.java (generate): Uncomment protection
	domain code.
	* java/lang/natClassLoader.cc (defineClass): Added `loader'
	argument.
	(linkClass0): Now in VMClassLoader.
	(markClassErrorState0): Likewise.
	(getSystemClassLoaderInternal): New method.
	* java/lang/natClass.cc (initializeClass): Use
	VMClassLoader::resolveClass.
	* java/lang/ClassLoader.java: New version, from Classpath.
	* java/lang/Class.java (getProtectionDomain):
	protectionDomainPermission and unknownProtectionDomain now in
	VMClassLoader.
	* java/lang/Class.h: VMClassLoader now a friend class.
	* gnu/gcj/runtime/VMClassLoader.java (instance): Now
	package-private.
	* gcj/javaprims.h: Regenerated class list.
	* resolve.cc (_Jv_PrepareClass): Use VMClassLoader::resolveClass.
	* java/lang/VMClassLoader.java: New version from Classpath;
	modified for libgcj use.

From-SVN: r71765
parent d70f15d2
Showing with 880 additions and 690 deletions
libjava/ChangeLog
2003-09-25 Tom Tromey <tromey@redhat.com>
* java/lang/reflect/Proxy.java (generate): Uncomment protection
domain code.
* java/lang/natClassLoader.cc (defineClass): Added `loader'
argument.
(linkClass0): Now in VMClassLoader.
(markClassErrorState0): Likewise.
(getSystemClassLoaderInternal): New method.
* java/lang/natClass.cc (initializeClass): Use
VMClassLoader::resolveClass.
* java/lang/ClassLoader.java: New version, from Classpath.
* java/lang/Class.java (getProtectionDomain):
protectionDomainPermission and unknownProtectionDomain now in
VMClassLoader.
* java/lang/Class.h: VMClassLoader now a friend class.
* gnu/gcj/runtime/VMClassLoader.java (instance): Now
package-private.
* gcj/javaprims.h: Regenerated class list.
* resolve.cc (_Jv_PrepareClass): Use VMClassLoader::resolveClass.
* java/lang/VMClassLoader.java: New version from Classpath;
modified for libgcj use.
2003-09-25 Michael Koch <konqueror@gmx.de> 2003-09-25 Michael Koch <konqueror@gmx.de>
* java/nio/ByteBufferHelper.java: * java/nio/ByteBufferHelper.java:
......
libjava/gcj/javaprims.h
// javaprims.h - Main external header file for libgcj. -*- c++ -*- // javaprims.h - Main external header file for libgcj. -*- c++ -*-
/* Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation
This file is part of libgcj. This file is part of libgcj.
...@@ -373,6 +373,39 @@ extern "Java" ...@@ -373,6 +373,39 @@ extern "Java"
class Manifest; class Manifest;
} }
namespace logging
{
class ConsoleHandler;
class ErrorManager;
class FileHandler;
class Filter;
class Formatter;
class Handler;
class Level;
class LogManager;
class LogRecord;
class Logger;
class LoggingPermission;
class MemoryHandler;
class SimpleFormatter;
class SocketHandler;
class StreamHandler;
class XMLFormatter;
}
namespace prefs
{
class AbstractPreferences;
class BackingStoreException;
class InvalidPreferencesFormatException;
class NodeChangeEvent;
class NodeChangeListener;
class PreferenceChangeEvent;
class PreferenceChangeListener;
class Preferences;
class PreferencesFactory;
}
namespace regex namespace regex
{ {
class Matcher; class Matcher;
......
libjava/gnu/gcj/runtime/VMClassLoader.java
...@@ -90,7 +90,7 @@ public final class VMClassLoader extends java.net.URLClassLoader ...@@ -90,7 +90,7 @@ public final class VMClassLoader extends java.net.URLClassLoader
private int lib_control; private int lib_control;
// The only VMClassLoader that can exist. // The only VMClassLoader that can exist.
public static VMClassLoader instance = new VMClassLoader(); static VMClassLoader instance = new VMClassLoader();
private static final int LIB_FULL = 0; private static final int LIB_FULL = 0;
private static final int LIB_CACHE = 1; private static final int LIB_CACHE = 1;
......
libjava/java/lang/Class.h
...@@ -290,6 +290,7 @@ private: ...@@ -290,6 +290,7 @@ private:
// Friends classes and functions to implement the ClassLoader // Friends classes and functions to implement the ClassLoader
friend class java::lang::ClassLoader; friend class java::lang::ClassLoader;
friend class java::lang::VMClassLoader;
friend class java::io::ObjectOutputStream; friend class java::io::ObjectOutputStream;
friend class java::io::ObjectInputStream; friend class java::io::ObjectInputStream;
......
libjava/java/lang/Class.java
...@@ -227,12 +227,12 @@ public final class Class implements Serializable ...@@ -227,12 +227,12 @@ public final class Class implements Serializable
{ {
SecurityManager sm = System.getSecurityManager(); SecurityManager sm = System.getSecurityManager();
if (sm != null) if (sm != null)
sm.checkPermission(ClassLoader.protectionDomainPermission); sm.checkPermission(VMClassLoader.protectionDomainPermission);
ProtectionDomain protectionDomain = getProtectionDomain0(); ProtectionDomain protectionDomain = getProtectionDomain0();
if (protectionDomain == null) if (protectionDomain == null)
return ClassLoader.unknownProtectionDomain; return VMClassLoader.unknownProtectionDomain;
else else
return protectionDomain; return protectionDomain;
} }
......
libjava/java/lang/ClassLoader.java
// ClassLoader.java - Define policies for loading Java classes. /* ClassLoader.java -- responsible for loading classes into the VM
Copyright (C) 1998, 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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. */
/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.lang; package java.lang;
import java.io.InputStream; import java.io.InputStream;
import java.io.IOException; import java.io.IOException;
import java.lang.reflect.Constructor;
import java.net.URL; import java.net.URL;
import java.security.AllPermission;
import java.security.CodeSource; import java.security.CodeSource;
import java.security.Permission; import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.Policy; import java.security.Policy;
import java.security.ProtectionDomain; import java.security.ProtectionDomain;
import java.util.*; import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import gnu.java.util.DoubleEnumeration;
import gnu.java.util.EmptyEnumeration;
/** /**
* The ClassLoader is a way of customizing the way Java gets its classes * The ClassLoader is a way of customizing the way Java gets its classes
...@@ -30,11 +61,11 @@ import java.util.*; ...@@ -30,11 +61,11 @@ import java.util.*;
* modification! * modification!
* *
* <p>Every classloader has a parent classloader that is consulted before * <p>Every classloader has a parent classloader that is consulted before
* the 'child' classloader when classes or resources should be loaded. * the 'child' classloader when classes or resources should be loaded.
* This is done to make sure that classes can be loaded from an hierarchy of * This is done to make sure that classes can be loaded from an hierarchy of
* multiple classloaders and classloaders do not accidentially redefine * multiple classloaders and classloaders do not accidentially redefine
* already loaded classes by classloaders higher in the hierarchy. * already loaded classes by classloaders higher in the hierarchy.
* *
* <p>The grandparent of all classloaders is the bootstrap classloader, which * <p>The grandparent of all classloaders is the bootstrap classloader, which
* loads all the standard system classes as implemented by GNU Classpath. The * loads all the standard system classes as implemented by GNU Classpath. The
* other special classloader is the system classloader (also called * other special classloader is the system classloader (also called
...@@ -78,8 +109,7 @@ import java.util.*; ...@@ -78,8 +109,7 @@ import java.util.*;
* *
* @author John Keiser * @author John Keiser
* @author Mark Wielaard * @author Mark Wielaard
* @author Eric Blake * @author Eric Blake <ebb9@email.byu.edu>
* @author Kresten Krab Thorup
* @see Class * @see Class
* @since 1.0 * @since 1.0
* @status still missing 1.4 functionality * @status still missing 1.4 functionality
...@@ -95,6 +125,50 @@ public abstract class ClassLoader ...@@ -95,6 +125,50 @@ public abstract class ClassLoader
final Map loadedClasses = new HashMap(); final Map loadedClasses = new HashMap();
/** /**
* All packages defined by this classloader. It is not private in order to
* allow native code (and trusted subclasses) access to this field.
*/
final Map definedPackages = new HashMap();
/**
* The classloader that is consulted before this classloader.
* If null then the parent is the bootstrap classloader.
*/
private final ClassLoader parent;
/**
* This is true if this classloader was successfully initialized.
* This flag is needed to avoid a class loader attack: even if the
* security manager rejects an attempt to create a class loader, the
* malicious class could have a finalize method which proceeds to
* define classes.
*/
private final boolean initialized;
/**
* System/Application classloader: defaults to an instance of
* gnu.java.lang.SystemClassLoader, unless the first invocation of
* getSystemClassLoader loads another class loader because of the
* java.system.class.loader property. The initialization of this field
* is somewhat circular - getSystemClassLoader() checks whether this
* field is null in order to bypass a security check.
*/
static final ClassLoader systemClassLoader =
VMClassLoader.getSystemClassLoader();
/**
* The default protection domain, used when defining a class with a null
* paramter for the domain.
*/
static final ProtectionDomain defaultProtectionDomain;
static
{
CodeSource cs = new CodeSource(null, null);
PermissionCollection perm = Policy.getPolicy().getPermissions(cs);
defaultProtectionDomain = new ProtectionDomain(cs, perm);
}
/**
* The desired assertion status of classes loaded by this loader, if not * The desired assertion status of classes loaded by this loader, if not
* overridden by package or class instructions. * overridden by package or class instructions.
*/ */
...@@ -136,157 +210,105 @@ public abstract class ClassLoader ...@@ -136,157 +210,105 @@ public abstract class ClassLoader
Map classAssertionStatus; Map classAssertionStatus;
/** /**
* The classloader that is consulted before this classloader. * Create a new ClassLoader with as parent the system classloader. There
* If null then the parent is the bootstrap classloader. * may be a security check for <code>checkCreateClassLoader</code>.
*/
private final ClassLoader parent;
/**
* All packages defined by this classloader. It is not private in order to
* allow native code (and trusted subclasses) access to this field.
*/
private HashMap definedPackages = new HashMap();
/**
* Returns the parent of this classloader. If the parent of this
* classloader is the bootstrap classloader then this method returns
* <code>null</code>. A security check may be performed on
* <code>RuntimePermission("getClassLoader")</code>.
* *
* @throws SecurityException if the security check fails * @throws SecurityException if the security check fails
* @since 1.2
*/ */
public final ClassLoader getParent () protected ClassLoader() throws SecurityException
{ {
// Check if we may return the parent classloader this(systemClassLoader);
SecurityManager sm = System.getSecurityManager();
if (sm != null)
{
Class c = VMSecurityManager.getClassContext()[1];
ClassLoader cl = c.getClassLoader();
if (cl != null && ! cl.isAncestorOf(this))
sm.checkPermission(new RuntimePermission("getClassLoader"));
}
return parent;
} }
/** /**
* Returns the system classloader. The system classloader (also called * Create a new ClassLoader with the specified parent. The parent will
* the application classloader) is the classloader that was used to * be consulted when a class or resource is requested through
* load the application classes on the classpath (given by the system * <code>loadClass()</code> or <code>getResource()</code>. Only when the
* property <code>java.class.path</code>. This is set as the context * parent classloader cannot provide the requested class or resource the
* class loader for a thread. The system property * <code>findClass()</code> or <code>findResource()</code> method
* <code>java.system.class.loader</code>, if defined, is taken to be the * of this classloader will be called. There may be a security check for
* name of the class to use as the system class loader, which must have * <code>checkCreateClassLoader</code>.
* a public constructor which takes a ClassLoader as a parent; otherwise this
* uses gnu.java.lang.SystemClassLoader.
*
* <p>Note that this is different from the bootstrap classloader that
* actually loads all the real "system" classes (the bootstrap classloader
* is the parent of the returned system classloader).
* *
* <p>A security check will be performed for * @param parent the classloader's parent, or null for the bootstrap
* <code>RuntimePermission("getClassLoader")</code> if the calling class * classloader
* is not a parent of the system class loader.
*
* @return the system class loader
* @throws SecurityException if the security check fails * @throws SecurityException if the security check fails
* @throws IllegalStateException if this is called recursively
* @throws Error if <code>java.system.class.loader</code> fails to load
* @since 1.2 * @since 1.2
*/ */
public static ClassLoader getSystemClassLoader () protected ClassLoader(ClassLoader parent)
{ {
return gnu.gcj.runtime.VMClassLoader.instance; // May we create a new classloader?
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkCreateClassLoader();
this.parent = parent;
this.initialized = true;
} }
/** /**
* Creates a <code>ClassLoader</code> with no parent. * Load a class using this ClassLoader or its parent, without resolving
* @exception java.lang.SecurityException if not allowed * it. Calls <code>loadClass(name, false)</code>.
*
* <p>Subclasses should not override this method but should override
* <code>findClass()</code> which is called by this method.
*
* @param name the name of the class relative to this ClassLoader
* @return the loaded class
* @throws ClassNotFoundException if the class cannot be found
*/ */
protected ClassLoader() public Class loadClass(String name) throws ClassNotFoundException
{ {
this (null); return loadClass(name, false);
} }
/** /**
* Creates a <code>ClassLoader</code> with the given parent. * Load a class using this ClassLoader or its parent, possibly resolving
* The parent may be <code>null</code>. * it as well using <code>resolveClass()</code>. It first tries to find
* The only thing this * out if the class has already been loaded through this classloader by
* constructor does, is to call * calling <code>findLoadedClass()</code>. Then it calls
* <code>checkCreateClassLoader</code> on the current * <code>loadClass()</code> on the parent classloader (or when there is
* security manager. * no parent it uses the VM bootclassloader)</code>). If the class is still
* @exception java.lang.SecurityException if not allowed * not loaded it tries to create a new class by calling
* @since 1.2 * <code>findClass()</code>. Finally when <code>resolve</code> is
* <code>true</code> it also calls <code>resolveClass()</code> on the
* newly loaded class.
*
* <p>Subclasses should not override this method but should override
* <code>findClass()</code> which is called by this method.
*
* @param name the fully qualified name of the class to load
* @param resolve whether or not to resolve the class
* @return the loaded class
* @throws ClassNotFoundException if the class cannot be found
*/ */
protected ClassLoader(ClassLoader parent) protected synchronized Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{ {
SecurityManager security = System.getSecurityManager (); // Have we already loaded this class?
if (security != null) Class c = findLoadedClass(name);
security.checkCreateClassLoader (); if (c != null)
this.parent = parent; return c;
}
/** // Can the class be loaded by a parent?
* Loads and link the class by the given name. try
* @param name the name of the class.
* @return the class loaded.
* @see ClassLoader#loadClass(String,boolean)
* @exception java.lang.ClassNotFoundException
*/
public Class loadClass(String name)
throws java.lang.ClassNotFoundException
{
return loadClass (name, false);
}
/**
* Loads the class by the given name. The default implementation
* will search for the class in the following order (similar to jdk 1.2)
* <ul>
* <li> First <code>findLoadedClass</code>.
* <li> If parent is non-null, <code>parent.loadClass</code>;
* otherwise <code>findSystemClass</code>.
* <li> <code>findClass</code>.
* </ul>
* If <code>link</code> is true, <code>resolveClass</code> is then
* called. <p> Normally, this need not be overridden; override
* <code>findClass</code> instead.
* @param name the name of the class.
* @param link if the class should be linked.
* @return the class loaded.
* @exception java.lang.ClassNotFoundException
*/
protected Class loadClass(String name, boolean link)
throws java.lang.ClassNotFoundException
{
Class c = findLoadedClass (name);
if (c == null)
{ {
try if (parent == null)
{ {
ClassLoader cl = parent; c = VMClassLoader.loadClass(name, resolve);
if (parent == null) if (c != null)
cl = gnu.gcj.runtime.VMClassLoader.instance; return c;
if (cl != this)
c = cl.loadClass (name, link);
} }
catch (ClassNotFoundException ex) else
{ {
/* ignore, we'll try findClass */; return parent.loadClass(name, resolve);
} }
} }
catch (ClassNotFoundException e)
if (c == null) {
c = findClass (name); }
// Still not found, we have to do it ourself.
if (c == null) c = findClass(name);
throw new ClassNotFoundException (name); if (resolve)
resolveClass(c);
if (link)
resolveClass (c);
return c; return c;
} }
...@@ -331,59 +353,29 @@ public abstract class ClassLoader ...@@ -331,59 +353,29 @@ public abstract class ClassLoader
* @return the requested Class * @return the requested Class
* @throws ClassNotFoundException when the class can not be found * @throws ClassNotFoundException when the class can not be found
* @since 1.2 * @since 1.2
*/ */
protected Class findClass (String name) protected Class findClass(String name) throws ClassNotFoundException
throws ClassNotFoundException
{ {
throw new ClassNotFoundException (name); throw new ClassNotFoundException(name);
} }
// Protection Domain definitions /**
// FIXME: should there be a special protection domain used for native code? * Helper to define a class using a string of bytes. This version is not
* secure.
// The permission required to check what a classes protection domain is. *
static final Permission protectionDomainPermission * @param data the data representing the classfile, in classfile format
= new RuntimePermission("getProtectionDomain"); * @param offset the offset into the data where the classfile starts
// The protection domain returned if we cannot determine it. * @param len the length of the classfile data in the array
static ProtectionDomain unknownProtectionDomain; * @return the class that was defined
// Protection domain to use when a class is defined without one specified. * @throws ClassFormatError if data is not in proper classfile format
static ProtectionDomain defaultProtectionDomain; * @throws IndexOutOfBoundsException if offset or len is negative, or
* offset + len exceeds data
static
{
Permissions permissions = new Permissions();
permissions.add(new AllPermission());
unknownProtectionDomain = new ProtectionDomain(null, permissions);
CodeSource cs = new CodeSource(null, null);
defaultProtectionDomain =
new ProtectionDomain(cs, Policy.getPolicy().getPermissions(cs));
}
/**
* Defines a class, given the class-data. According to the JVM, this
* method should not be used; instead use the variant of this method
* in which the name of the class being defined is specified
* explicitly.
* <P>
* If the name of the class, as specified (implicitly) in the class
* data, denotes a class which has already been loaded by this class
* loader, an instance of
* <code>java.lang.ClassNotFoundException</code> will be thrown.
*
* @param data bytes in class file format.
* @param off offset to start interpreting data.
* @param len length of data in class file.
* @return the class defined.
* @exception java.lang.ClassNotFoundException
* @exception java.lang.LinkageError
* @see ClassLoader#defineClass(String,byte[],int,int)
* @deprecated use {@link #defineClass(String, byte[], int, int)} instead * @deprecated use {@link #defineClass(String, byte[], int, int)} instead
*/ */
protected final Class defineClass(byte[] data, int off, int len) protected final Class defineClass(byte[] data, int offset, int len)
throws ClassFormatError throws ClassFormatError
{ {
return defineClass (null, data, off, len, defaultProtectionDomain); return defineClass(null, data, offset, len);
} }
/** /**
...@@ -405,351 +397,225 @@ public abstract class ClassLoader ...@@ -405,351 +397,225 @@ public abstract class ClassLoader
* @throws SecurityException if name starts with "java." * @throws SecurityException if name starts with "java."
* @since 1.1 * @since 1.1
*/ */
protected final Class defineClass(String name, byte[] data, int off, int len) protected final Class defineClass(String name, byte[] data, int offset,
throws ClassFormatError int len) throws ClassFormatError
{ {
return defineClass (name, data, off, len, defaultProtectionDomain); return defineClass(name, data, offset, len, null);
} }
/** /**
* Defines a class, given the class-data. This is preferable * Helper to define a class using a string of bytes. Subclasses should call
* over <code>defineClass(byte[],off,len)</code> since it is more * this method from their <code>findClass()</code> implementation. If the
* secure. If the expected name does not match that of the class * domain is null, the default of
* file, <code>ClassNotFoundException</code> is thrown. If * <code>Policy.getPolicy().getPermissions(new CodeSource(null, null))<code>
* <code>name</code> denotes the name of an already loaded class, a * is used. Once a class has been defined in a package, all further classes
* <code>LinkageError</code> is thrown. * in that package must have the same set of certificates or a
* <p> * SecurityException is thrown.
* *
* FIXME: How do we assure that the class-file data is not being * @param name the name to give the class. null if unknown
* modified, simultaneously with the class loader running!? If this * @param data the data representing the classfile, in classfile format
* was done in some very clever way, it might break security. * @param offset the offset into the data where the classfile starts
* Right now I am thinking that defineclass should make sure never to * @param len the length of the classfile data in the array
* read an element of this array more than once, and that that would * @param domain the ProtectionDomain to give to the class, null for the
* assure the ``immutable'' appearance. It is still to be determined * default protection domain
* if this is in fact how defineClass operates. * @return the class that was defined
* * @throws ClassFormatError if data is not in proper classfile format
* @param name the expected name. * @throws IndexOutOfBoundsException if offset or len is negative, or
* @param data bytes in class file format. * offset + len exceeds data
* @param off offset to start interpreting data. * @throws SecurityException if name starts with "java.", or if certificates
* @param len length of data in class file. * do not match up
* @param protectionDomain security protection domain for the class. * @since 1.2
* @return the class defined. */
* @exception java.lang.ClassNotFoundException protected final synchronized Class defineClass(String name, byte[] data,
* @exception java.lang.LinkageError int offset, int len,
*/ ProtectionDomain domain)
protected final synchronized Class defineClass(String name,
byte[] data,
int off,
int len,
ProtectionDomain protectionDomain)
throws ClassFormatError throws ClassFormatError
{ {
if (data==null || data.length < off+len || off<0 || len<0) if (domain == null)
throw new ClassFormatError ("arguments to defineClass " domain = defaultProtectionDomain;
+ "are meaningless"); if (! initialized)
throw new SecurityException("attempt to define class from uninitialized class loader");
// as per 5.3.5.1 Class retval = VMClassLoader.defineClass(this, name, data,
if (name != null && findLoadedClass (name) != null) offset, len, domain);
throw new java.lang.LinkageError ("class " loadedClasses.put(retval.getName(), retval);
+ name return retval;
+ " already loaded");
if (protectionDomain == null)
protectionDomain = defaultProtectionDomain;
try
{
Class retval = defineClass0 (name, data, off, len, protectionDomain);
loadedClasses.put(retval.getName(), retval);
return retval;
}
catch (LinkageError x)
{
throw x; // rethrow
}
catch (VirtualMachineError x)
{
throw x; // rethrow
}
catch (Throwable x)
{
// This should never happen, or we are beyond spec.
InternalError r = new InternalError ("Unexpected exception "
+ "while defining class "
+ name);
r.initCause(x);
throw r;
}
} }
/** This is the entry point of defineClass into the native code */ /**
private native Class defineClass0 (String name, * Links the class, if that has not already been done. Linking basically
byte[] data, * resolves all references to other classes made by this class.
int off, *
int len, * @param c the class to resolve
ProtectionDomain protectionDomain) * @throws NullPointerException if c is null
throws ClassFormatError; * @throws LinkageError if linking fails
*/
/** protected final void resolveClass(Class c)
* Link the given class. This will bring the class to a state where {
* the class initializer can be run. Linking involves the following VMClassLoader.resolveClass(c);
* steps:
* <UL>
* <LI> Prepare (allocate and internalize) the constant strings that
* are used in this class.
* <LI> Allocate storage for static fields, and define the layout
* of instance fields.
* <LI> Perform static initialization of ``static final'' int,
* long, float, double and String fields for which there is a
* compile-time constant initializer.
* <LI> Create the internal representation of the ``vtable''.
* </UL>
* For <code>gcj</code>-compiled classes, only the first step is
* performed. The compiler will have done the rest already.
* <P>
* This is called by the system automatically,
* as part of class initialization; there is no reason to ever call
* this method directly.
* <P>
* For historical reasons, this method has a name which is easily
* misunderstood. Java classes are never ``resolved''. Classes are
* linked; whereas method and field references are resolved.
*
* @param clazz the class to link.
* @exception java.lang.LinkageError
*/
protected final void resolveClass(Class clazz)
{
resolveClass0(clazz);
}
static void resolveClass0(Class clazz)
{
synchronized (clazz)
{
try
{
linkClass0 (clazz);
}
catch (Throwable x)
{
markClassErrorState0 (clazz);
LinkageError e;
if (x instanceof LinkageError)
e = (LinkageError)x;
else if (x instanceof ClassNotFoundException)
{
e = new NoClassDefFoundError("while resolving class: "
+ clazz.getName());
e.initCause (x);
}
else
{
e = new LinkageError ("unexpected exception during linking: "
+ clazz.getName());
e.initCause (x);
}
throw e;
}
}
} }
/** Internal method. Calls _Jv_PrepareClass and
* _Jv_PrepareCompiledClass. This is only called from resolveClass. */
private static native void linkClass0(Class clazz);
/** Internal method. Marks the given clazz to be in an erroneous
* state, and calls notifyAll() on the class object. This should only
* be called when the caller has the lock on the class object. */
private static native void markClassErrorState0(Class clazz);
/** /**
* Defines a new package and creates a Package object. * Helper to find a Class using the system classloader, possibly loading it.
* The package should be defined before any class in the package is * A subclass usually does not need to call this, if it correctly
* defined with <code>defineClass()</code>. The package should not yet * overrides <code>findClass(String)</code>.
* be defined before in this classloader or in one of its parents (which
* means that <code>getPackage()</code> should return <code>null</code>).
* All parameters except the <code>name</code> of the package may be
* <code>null</code>.
* <p>
* Subclasses should call this method from their <code>findClass()</code>
* implementation before calling <code>defineClass()</code> on a Class
* in a not yet defined Package (which can be checked by calling
* <code>getPackage()</code>).
*
* @param name The name of the Package
* @param specTitle The name of the specification
* @param specVendor The name of the specification designer
* @param specVersion The version of this specification
* @param implTitle The name of the implementation
* @param implVendor The vendor that wrote this implementation
* @param implVersion The version of this implementation
* @param sealed If sealed the origin of the package classes
* @return the Package object for the specified package
* *
* @exception IllegalArgumentException if the package name is null or if * @param name the name of the class to find
* it was already defined by this classloader or one of its parents. * @return the found class
* * @throws ClassNotFoundException if the class cannot be found
* @see Package
* @since 1.2
*/ */
protected Package definePackage(String name, protected final Class findSystemClass(String name)
String specTitle, String specVendor, throws ClassNotFoundException
String specVersion, String implTitle,
String implVendor, String implVersion,
URL sealed)
{ {
if (getPackage(name) != null) return Class.forName(name, false, systemClassLoader);
throw new IllegalArgumentException("Package " + name
+ " already defined");
Package p = new Package(name,
specTitle, specVendor, specVersion,
implTitle, implVendor, implVersion,
sealed);
synchronized (definedPackages)
{
definedPackages.put(name, p);
}
return p;
} }
/** /**
* Returns the Package object for the requested package name. It returns * Returns the parent of this classloader. If the parent of this
* null when the package is not defined by this classloader or one of its * classloader is the bootstrap classloader then this method returns
* parents. * <code>null</code>. A security check may be performed on
* <code>RuntimePermission("getClassLoader")</code>.
* *
* @param name the package name to find * @throws SecurityException if the security check fails
* @return the package, if defined
* @since 1.2 * @since 1.2
*/ */
protected Package getPackage(String name) public final ClassLoader getParent()
{ {
Package p; // Check if we may return the parent classloader.
if (parent == null) SecurityManager sm = System.getSecurityManager();
// XXX - Should we use the bootstrap classloader? if (sm != null)
p = null;
else
p = parent.getPackage(name);
if (p == null)
{ {
synchronized (definedPackages) Class c = VMSecurityManager.getClassContext()[1];
{ ClassLoader cl = c.getClassLoader();
p = (Package) definedPackages.get(name); if (cl != null && ! cl.isAncestorOf(this))
} sm.checkPermission(new RuntimePermission("getClassLoader"));
} }
return parent;
return p;
} }
/** /**
* Returns all Package objects defined by this classloader and its parents. * Helper to set the signers of a class. This should be called after
* defining the class.
* *
* @return an array of all defined packages * @param c the Class to set signers of
* @since 1.2 * @param signers the signers to set
* @since 1.1
*/ */
protected Package[] getPackages() protected final void setSigners(Class c, Object[] signers)
{ {
Package[] allPackages; // c.setSigners(signers);
// Get all our packages.
Package[] packages;
synchronized(definedPackages)
{
packages = new Package[definedPackages.size()];
definedPackages.values().toArray(packages);
}
// If we have a parent get all packages defined by our parents.
if (parent != null)
{
Package[] parentPackages = parent.getPackages();
allPackages = new Package[parentPackages.length + packages.length];
System.arraycopy(parentPackages, 0, allPackages, 0,
parentPackages.length);
System.arraycopy(packages, 0, allPackages, parentPackages.length,
packages.length);
}
else
// XXX - Should we use the bootstrap classloader?
allPackages = packages;
return allPackages;
} }
/** /**
* Called by <code>Runtime.loadLibrary()</code> to get an absolute path * Helper to find an already-loaded class in this ClassLoader.
* to a (system specific) library that was requested by a class loaded
* by this classloader. The default implementation returns
* <code>null</code>. It should be implemented by subclasses when they
* have a way to find the absolute path to a library. If this method
* returns null the library is searched for in the default locations
* (the directories listed in the <code>java.library.path</code> system
* property).
* *
* @param name the (system specific) name of the requested library * @param name the name of the class to find
* @return the full pathname to the requested library, or null * @return the found Class, or null if it is not found
* @see Runtime#loadLibrary() * @since 1.1
* @since 1.2
*/ */
protected String findLibrary(String name) protected final synchronized Class findLoadedClass(String name)
{ {
return null; // NOTE: If the VM is keeping its own cache, it may make sense to have
// this method be native.
return (Class) loadedClasses.get(name);
} }
/** /**
* Returns a class found in a system-specific way, typically * Get the URL to a resource using this classloader or one of its parents.
* via the <code>java.class.path</code> system property. Loads the * First tries to get the resource by calling <code>getResource()</code>
* class if necessary. * on the parent classloader. If the parent classloader returns null then
* it tries finding the resource by calling <code>findResource()</code> on
* this classloader. The resource name should be separated by '/' for path
* elements.
*
* <p>Subclasses should not override this method but should override
* <code>findResource()</code> which is called by this method.
* *
* @param name the class to resolve. * @param name the name of the resource relative to this classloader
* @return the class loaded. * @return the URL to the resource or null when not found
* @exception java.lang.LinkageError
* @exception java.lang.ClassNotFoundException
*/ */
protected final Class findSystemClass(String name) public URL getResource(String name)
throws java.lang.ClassNotFoundException
{ {
return gnu.gcj.runtime.VMClassLoader.instance.loadClass (name); URL result;
if (parent == null)
result = VMClassLoader.getResource(name);
else
result = parent.getResource(name);
if (result == null)
result = findResource(name);
return result;
} }
/** /**
* Helper to set the signers of a class. This should be called after * Returns an Enumeration of all resources with a given name that can
* defining the class. * be found by this classloader and its parents. Certain classloaders
* (such as the URLClassLoader when given multiple jar files) can have
* multiple resources with the same name that come from multiple locations.
* It can also occur that a parent classloader offers a resource with a
* certain name and the child classloader also offers a resource with that
* same name. <code>getResource() only offers the first resource (of the
* parent) with a given name. This method lists all resources with the
* same name. The name should use '/' as path separators.
* *
* @param c the Class to set signers of * <p>The Enumeration is created by first calling <code>getResources()</code>
* @param signers the signers to set * on the parent classloader and then calling <code>findResources()</code>
* @since 1.1 * on this classloader.
*/ *
protected final void setSigners(Class c, Object[] signers) * @param name the resource name
* @return an enumaration of all resources found
* @throws IOException if I/O errors occur in the process
* @since 1.2
*/
public final Enumeration getResources(String name) throws IOException
{ {
/* Enumeration parentResources;
* Does currently nothing. FIXME. if (parent == null)
*/ parentResources = VMClassLoader.getResources(name);
else
parentResources = parent.getResources(name);
return new DoubleEnumeration(parentResources, findResources(name));
} }
/** /**
* If a class named <code>name</code> was previously loaded using * Called whenever all locations of a named resource are needed.
* this <code>ClassLoader</code>, then it is returned. Otherwise * It is called by <code>getResources()</code> after it has called
* it returns <code>null</code>. * <code>parent.getResources()</code>. The results are combined by
* @param name class to find. * the <code>getResources()</code> method.
* @return the class loaded, or null. *
*/ * <p>The default implementation always returns an empty Enumeration.
protected final synchronized Class findLoadedClass(String name) * Subclasses should override it when they can provide an Enumeration of
* URLs (possibly just one element) to the named resource.
* The first URL of the Enumeration should be the same as the one
* returned by <code>findResource</code>.
*
* @param name the name of the resource to be found
* @return a possibly empty Enumeration of URLs to the named resource
* @throws IOException if I/O errors occur in the process
* @since 1.2
*/
protected Enumeration findResources(String name) throws IOException
{ {
return (Class) loadedClasses.get(name); return EmptyEnumeration.getInstance();
} }
/** /**
* Get a resource using the system classloader. * Called whenever a resource is needed that could not be provided by
* one of the parents of this classloader. It is called by
* <code>getResource()</code> after <code>parent.getResource()</code>
* couldn't provide the requested resource.
* *
* @param name the name of the resource relative to the system classloader * <p>The default implementation always returns null. Subclasses should
* @return an input stream for the resource, or null * override this method when they can provide a way to return a URL
* @since 1.1 * to a named resource.
*
* @param name the name of the resource to be found
* @return a URL to the named resource or null when not found
* @since 1.2
*/ */
public static InputStream getSystemResourceAsStream(String name) { protected URL findResource(String name)
return getSystemClassLoader().getResourceAsStream (name); {
return null;
} }
/** /**
...@@ -759,8 +625,9 @@ public abstract class ClassLoader ...@@ -759,8 +625,9 @@ public abstract class ClassLoader
* @return the URL to the resource * @return the URL to the resource
* @since 1.1 * @since 1.1
*/ */
public static URL getSystemResource(String name) { public static final URL getSystemResource(String name)
return getSystemClassLoader().getResource (name); {
return systemClassLoader.getResource(name);
} }
/** /**
...@@ -776,149 +643,221 @@ public abstract class ClassLoader ...@@ -776,149 +643,221 @@ public abstract class ClassLoader
*/ */
public static Enumeration getSystemResources(String name) throws IOException public static Enumeration getSystemResources(String name) throws IOException
{ {
return getSystemClassLoader().getResources(name); return systemClassLoader.getResources(name);
} }
/** /**
* Return an InputStream representing the resource name. * Get a resource as stream using this classloader or one of its parents.
* This is essentially like * First calls <code>getResource()</code> and if that returns a URL to
* <code>getResource(name).openStream()</code>, except * the resource then it calls and returns the InputStream given by
* it masks out any IOException and returns null on failure. * <code>URL.openStream()</code>.
* @param name resource to load *
* @return an InputStream, or null * <p>Subclasses should not override this method but should override
* @see java.lang.ClassLoader#getResource(String) * <code>findResource()</code> which is called by this method.
* @see java.io.InputStream *
* @param name the name of the resource relative to this classloader
* @return an InputStream to the resource, or null
* @since 1.1
*/ */
public InputStream getResourceAsStream(String name) public InputStream getResourceAsStream(String name)
{ {
try try
{ {
URL res = getResource (name); URL url = getResource(name);
if (res == null) if (url == null)
return null; return null;
return res.openStream (); return url.openStream();
} }
catch (java.io.IOException x) catch (IOException e)
{ {
return null; return null;
} }
} }
/** /**
* Return an java.io.URL representing the resouce <code>name</code>. * Get a resource using the system classloader.
* The default implementation just returns <code>null</code>. *
* @param name resource to load * @param name the name of the resource relative to the system classloader
* @return a URL, or null if there is no such resource. * @return an input stream for the resource, or null
* @see java.lang.ClassLoader#getResourceAsBytes(String) * @since 1.1
* @see java.lang.ClassLoader#getResourceAsStream(String)
* @see java.io.URL
*/ */
public URL getResource (String name) public static final InputStream getSystemResourceAsStream(String name)
{ {
// The rules say search the parent class if non-null, try
// otherwise search the built-in class loader (assumed to be {
// the system ClassLoader). If not found, call URL url = getSystemResource(name);
// findResource(). if (url == null)
URL result = null; return null;
return url.openStream();
ClassLoader delegate = parent; }
catch (IOException e)
{
return null;
}
}
if (delegate == null) /**
delegate = getSystemClassLoader (); * Returns the system classloader. The system classloader (also called
* the application classloader) is the classloader that was used to
// Protect ourselves from looping. * load the application classes on the classpath (given by the system
if (this != delegate) * property <code>java.class.path</code>. This is set as the context
result = delegate.getResource (name); * class loader for a thread. The system property
* <code>java.system.class.loader</code>, if defined, is taken to be the
* name of the class to use as the system class loader, which must have
* a public constructor which takes a ClassLoader as a parent; otherwise this
* uses gnu.java.lang.SystemClassLoader.
*
* <p>Note that this is different from the bootstrap classloader that
* actually loads all the real "system" classes (the bootstrap classloader
* is the parent of the returned system classloader).
*
* <p>A security check will be performed for
* <code>RuntimePermission("getClassLoader")</code> if the calling class
* is not a parent of the system class loader.
*
* @return the system class loader
* @throws SecurityException if the security check fails
* @throws IllegalStateException if this is called recursively
* @throws Error if <code>java.system.class.loader</code> fails to load
* @since 1.2
*/
public static ClassLoader getSystemClassLoader()
{
// Check if we may return the system classloader
SecurityManager sm = System.getSecurityManager();
if (sm != null)
{
Class c = VMSecurityManager.getClassContext()[1];
ClassLoader cl = c.getClassLoader();
if (cl != null && cl != systemClassLoader)
sm.checkPermission(new RuntimePermission("getClassLoader"));
}
if (result != null) return systemClassLoader;
return result;
else
return findResource (name);
} }
/** /**
* Called whenever a resource is needed that could not be provided by * Defines a new package and creates a Package object. The package should
* one of the parents of this classloader. It is called by * be defined before any class in the package is defined with
* <code>getResource()</code> after <code>parent.getResource()</code> * <code>defineClass()</code>. The package should not yet be defined
* couldn't provide the requested resource. * before in this classloader or in one of its parents (which means that
* <code>getPackage()</code> should return <code>null</code>). All
* parameters except the <code>name</code> of the package may be
* <code>null</code>.
* *
* <p>The default implementation always returns null. Subclasses should * <p>Subclasses should call this method from their <code>findClass()</code>
* override this method when they can provide a way to return a URL * implementation before calling <code>defineClass()</code> on a Class
* to a named resource. * in a not yet defined Package (which can be checked by calling
* <code>getPackage()</code>).
* *
* @param name the name of the resource to be found * @param name the name of the Package
* @return a URL to the named resource or null when not found * @param specTitle the name of the specification
* @param specVendor the name of the specification designer
* @param specVersion the version of this specification
* @param implTitle the name of the implementation
* @param implVendor the vendor that wrote this implementation
* @param implVersion the version of this implementation
* @param sealed if sealed the origin of the package classes
* @return the Package object for the specified package
* @throws IllegalArgumentException if the package name is null or it
* was already defined by this classloader or one of its parents
* @see Package
* @since 1.2 * @since 1.2
*/ */
protected URL findResource (String name) protected Package definePackage(String name, String specTitle,
String specVendor, String specVersion,
String implTitle, String implVendor,
String implVersion, URL sealed)
{ {
// Default to returning null. Derived classes implement this. if (getPackage(name) != null)
return null; throw new IllegalArgumentException("Package " + name
+ " already defined");
Package p = new Package(name, specTitle, specVendor, specVersion,
implTitle, implVendor, implVersion, sealed);
synchronized (definedPackages)
{
definedPackages.put(name, p);
}
return p;
} }
/** /**
* Returns an Enumeration of all resources with a given name that can * Returns the Package object for the requested package name. It returns
* be found by this classloader and its parents. Certain classloaders * null when the package is not defined by this classloader or one of its
* (such as the URLClassLoader when given multiple jar files) can have * parents.
* multiple resources with the same name that come from multiple locations.
* It can also occur that a parent classloader offers a resource with a
* certain name and the child classloader also offers a resource with that
* same name. <code>getResource() only offers the first resource (of the
* parent) with a given name. This method lists all resources with the
* same name. The name should use '/' as path separators.
*
* <p>The Enumeration is created by first calling <code>getResources()</code>
* on the parent classloader and then calling <code>findResources()</code>
* on this classloader.
* *
* @param name the resource name * @param name the package name to find
* @return an enumaration of all resources found * @return the package, if defined
* @throws IOException if I/O errors occur in the process
* @since 1.2 * @since 1.2
*/ */
public final Enumeration getResources(String name) throws IOException protected Package getPackage(String name)
{ {
// The rules say search the parent class if non-null, Package p;
// otherwise search the built-in class loader (assumed to be if (parent == null)
// the system ClassLoader). If not found, call p = VMClassLoader.getPackage(name);
// findResource(). else
Enumeration result = null; p = parent.getPackage(name);
ClassLoader delegate = parent; if (p == null)
{
synchronized (definedPackages)
{
p = (Package) definedPackages.get(name);
}
}
return p;
}
if (delegate == null) /**
delegate = getSystemClassLoader (); * Returns all Package objects defined by this classloader and its parents.
*
// Protect ourselves from looping. * @return an array of all defined packages
if (this != delegate) * @since 1.2
result = delegate.getResources (name); */
protected Package[] getPackages()
{
// Get all our packages.
Package[] packages;
synchronized(definedPackages)
{
packages = new Package[definedPackages.size()];
definedPackages.values().toArray(packages);
}
if (result != null) // If we have a parent get all packages defined by our parents.
return result; Package[] parentPackages;
if (parent == null)
parentPackages = VMClassLoader.getPackages();
else else
return findResources (name); parentPackages = parent.getPackages();
Package[] allPackages = new Package[parentPackages.length
+ packages.length];
System.arraycopy(parentPackages, 0, allPackages, 0,
parentPackages.length);
System.arraycopy(packages, 0, allPackages, parentPackages.length,
packages.length);
return allPackages;
} }
/** /**
* Called whenever all locations of a named resource are needed. * Called by <code>Runtime.loadLibrary()</code> to get an absolute path
* It is called by <code>getResources()</code> after it has called * to a (system specific) library that was requested by a class loaded
* <code>parent.getResources()</code>. The results are combined by * by this classloader. The default implementation returns
* the <code>getResources()</code> method. * <code>null</code>. It should be implemented by subclasses when they
* * have a way to find the absolute path to a library. If this method
* <p>The default implementation always returns an empty Enumeration. * returns null the library is searched for in the default locations
* Subclasses should override it when they can provide an Enumeration of * (the directories listed in the <code>java.library.path</code> system
* URLs (possibly just one element) to the named resource. * property).
* The first URL of the Enumeration should be the same as the one
* returned by <code>findResource</code>.
* *
* @param name the name of the resource to be found * @param name the (system specific) name of the requested library
* @return a possibly empty Enumeration of URLs to the named resource * @return the full pathname to the requested library, or null
* @throws IOException if I/O errors occur in the process * @see Runtime#loadLibrary()
* @since 1.2 * @since 1.2
*/ */
protected Enumeration findResources(String name) throws IOException protected String findLibrary(String name)
{ {
return Collections.enumeration(Collections.EMPTY_LIST); return null;
} }
/** /**
...@@ -935,7 +874,7 @@ public abstract class ClassLoader ...@@ -935,7 +874,7 @@ public abstract class ClassLoader
{ {
defaultAssertionStatus = enabled; defaultAssertionStatus = enabled;
} }
/** /**
* Set the default assertion status for packages, used unless overridden * Set the default assertion status for packages, used unless overridden
* by a class request. This default also covers subpackages, unless they * by a class request. This default also covers subpackages, unless they
......
libjava/java/lang/VMClassLoader.java
/* /* VMClassLoader.java -- Reference implementation of native interface
* java.lang.ClassLoader: part of the Java Class Libraries project. required by ClassLoader
* Copyright (C) 1998, 2001, 2002 Free Software Foundation Copyright (C) 1998, 2001, 2002, 2003 Free Software Foundation
*
* This library is free software; you can redistribute it and/or This file is part of GNU Classpath.
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either GNU Classpath is free software; you can redistribute it and/or modify
* version 2 of the License, or (at your option) any later version. it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* This library is distributed in the hope that it will be useful, any later version.
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU GNU Classpath is distributed in the hope that it will be useful, but
* Library General Public License for more details. WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* You should have received a copy of the GNU Library General Public General Public License for more details.
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330, You should have received a copy of the GNU General Public License
* Boston, MA 02111-1307, USA. along with GNU Classpath; see the file COPYING. If not, write to the
*/ Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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; package java.lang;
import java.util.*; import java.security.ProtectionDomain;
import java.net.URL;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;
import java.util.HashMap;
import java.lang.reflect.Constructor;
import java.security.AllPermission;
import java.security.Permission;
import java.security.Permissions;
import java.security.ProtectionDomain;
import gnu.java.util.EmptyEnumeration;
/** /**
* java.lang.VMClassLoader is a package-private helper for VMs to implement * java.lang.VMClassLoader is a package-private helper for VMs to implement
* on behalf of java.lang.ClassLoader. * on behalf of java.lang.ClassLoader.
* *
* @author John Keiser * @author John Keiser
* @version 1.1.0, Sep 22 1998 * @author Mark Wielaard <mark@klomp.org>
* @since CP1.1 * @author Eric Blake <ebb9@email.byu.edu>
*/ */
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);
}
/**
* Helper to define a class using a string of bytes. This assumes that
* the security checks have already been performed, if necessary.
*
* <strong>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.</strong>
*
* @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;
static final native void linkClass0 (Class klass);
static final native void markClassErrorState0 (Class klass);
/**
* Helper to resolve all references to other classes from this class.
*
* @param c the class to resolve
*/
static final void resolveClass(Class clazz)
{
synchronized (clazz)
{
try
{
linkClass0 (clazz);
}
catch (Throwable x)
{
markClassErrorState0 (clazz);
LinkageError e;
if (x instanceof LinkageError)
e = (LinkageError) x;
else if (x instanceof ClassNotFoundException)
{
e = new NoClassDefFoundError("while resolving class: "
+ clazz.getName());
e.initCause (x);
}
else
{
e = new LinkageError ("unexpected exception during linking: "
+ clazz.getName());
e.initCause (x);
}
throw e;
}
}
}
/**
* Helper to load a class from the bootstrap class loader.
*
* In libgcj, this does nothing, as the default system loader knows
* how to find classes that have been linked in.
*
* @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 Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
return null;
}
class VMClassLoader { /**
* Helper to load a resource from the bootstrap class loader.
/** *
* Helper to define a class using a string of bytes. * In libgcj, this does nothing, as the default system loader knows
* * how to find resources that have been linked in.
* @param name the name to give the class. null if unknown. *
* @param data the data representing the classfile, in classfile format. * @param name the resource to find
* @param offset the offset into the data where the classfile starts. * @return the URL to the resource
* @param len the length of the classfile data in the array. */
* @return the class that was defined. static URL getResource(String name)
* @exception ClassFormatError if the byte array is not in proper classfile format. {
*/ return null;
final static native Class defineClass(ClassLoader cl, String name, }
byte[] data, int offset, int len)
throws ClassFormatError; /**
* Helper to get a list of resources from the bootstrap class loader.
/** *
* Helper to resolve all references to other classes from this class. * In libgcj, this does nothing, as the default system loader knows
* @param c the class to resolve. * how to find resources that have been linked in.
*/ *
// Not yet needed for libgcj. * @param name the resource to find
// final static native void resolveClass(Class c); * @return an enumeration of resources
* @throws IOException if one occurs
/** */
* Helper for java.lang.Integer, Byte, etc. to get the TYPE class static Enumeration getResources(String name) throws IOException
* at initialization time. {
* return EmptyEnumeration.getInstance();
* @param type code for the primitive type. }
*/
static native Class getPrimitiveClass(char type); /**
* 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 Package getPackage(String name)
{
return null;
}
/**
* 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 Package[] getPackages()
{
return new Package[0];
}
/**
* 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.
*
* <ul>
* <li>'Z' - boolean</li>
* <li>'B' - byte</li>
* <li>'C' - char</li>
* <li>'D' - double</li>
* <li>'F' - float</li>
* <li>'I' - int</li>
* <li>'J' - long</li>
* <li>'S' - short</li>
* <li>'V' - void</li>
* </ul>
*
* @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 * The system default for assertion status. This is used for all system
...@@ -104,4 +275,34 @@ class VMClassLoader { ...@@ -104,4 +275,34 @@ class VMClassLoader {
{ {
return new HashMap(); return new HashMap();
} }
static native ClassLoader getSystemClassLoaderInternal();
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 e)
{
System.err.println("Requested system classloader "
+ loader + " failed, using "
+ "gnu.gcj.runtime.VMClassLoader");
e.printStackTrace();
}
}
return default_sys;
}
} }
libjava/java/lang/natClass.cc
...@@ -48,6 +48,7 @@ details. */ ...@@ -48,6 +48,7 @@ details. */
#include <java/lang/System.h> #include <java/lang/System.h>
#include <java/lang/SecurityManager.h> #include <java/lang/SecurityManager.h>
#include <java/lang/StringBuffer.h> #include <java/lang/StringBuffer.h>
#include <java/lang/VMClassLoader.h>
#include <gnu/gcj/runtime/StackTrace.h> #include <gnu/gcj/runtime/StackTrace.h>
#include <gcj/method.h> #include <gcj/method.h>
#include <gnu/gcj/runtime/MethodRef.h> #include <gnu/gcj/runtime/MethodRef.h>
...@@ -758,7 +759,7 @@ java::lang::Class::initializeClass (void) ...@@ -758,7 +759,7 @@ java::lang::Class::initializeClass (void)
{ {
// this can throw exceptions, so exit the monitor as a precaution. // this can throw exceptions, so exit the monitor as a precaution.
_Jv_MonitorExit (this); _Jv_MonitorExit (this);
java::lang::ClassLoader::resolveClass0 (this); java::lang::VMClassLoader::resolveClass (this);
_Jv_MonitorEnter (this); _Jv_MonitorEnter (this);
} }
else else
......
libjava/java/lang/natClassLoader.cc
// natClassLoader.cc - Implementation of java.lang.ClassLoader native methods. // natClassLoader.cc - Implementation of java.lang.ClassLoader native methods.
/* Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation /* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation
This file is part of libgcj. This file is part of libgcj.
...@@ -44,11 +44,12 @@ details. */ ...@@ -44,11 +44,12 @@ details. */
/////////// java.lang.ClassLoader native methods //////////// /////////// java.lang.ClassLoader native methods ////////////
java::lang::Class * java::lang::Class *
java::lang::ClassLoader::defineClass0 (jstring name, java::lang::VMClassLoader::defineClass (java::lang::ClassLoader *loader,
jbyteArray data, jstring name,
jint offset, jbyteArray data,
jint length, jint offset,
java::security::ProtectionDomain *pd) jint length,
java::security::ProtectionDomain *pd)
{ {
#ifdef INTERPRETER #ifdef INTERPRETER
jclass klass; jclass klass;
...@@ -62,8 +63,8 @@ java::lang::ClassLoader::defineClass0 (jstring name, ...@@ -62,8 +63,8 @@ java::lang::ClassLoader::defineClass0 (jstring name,
// Record the defining loader. For the system class loader, we // Record the defining loader. For the system class loader, we
// record NULL. // record NULL.
if (this != java::lang::ClassLoader::getSystemClassLoader()) if (loader != java::lang::ClassLoader::getSystemClassLoader())
klass->loader = this; klass->loader = loader;
if (name != 0) if (name != 0)
{ {
...@@ -105,6 +106,36 @@ java::lang::ClassLoader::defineClass0 (jstring name, ...@@ -105,6 +106,36 @@ java::lang::ClassLoader::defineClass0 (jstring name,
#endif #endif
} }
// Finish linking a class. Only called from ClassLoader::resolveClass.
void
java::lang::VMClassLoader::linkClass0 (java::lang::Class *klass)
{
_Jv_WaitForState (klass, JV_STATE_LINKED);
}
void
java::lang::VMClassLoader::markClassErrorState0 (java::lang::Class *klass)
{
klass->state = JV_STATE_ERROR;
klass->notifyAll ();
}
java::lang::ClassLoader *
java::lang::VMClassLoader::getSystemClassLoaderInternal()
{
_Jv_InitClass (&gnu::gcj::runtime::VMClassLoader::class$);
return gnu::gcj::runtime::VMClassLoader::instance;
}
jclass
java::lang::VMClassLoader::getPrimitiveClass (jchar type)
{
char sig[2];
sig[0] = (char) type;
sig[1] = '\0';
return _Jv_FindClassFromSignature (sig, NULL);
}
void void
_Jv_WaitForState (jclass klass, int state) _Jv_WaitForState (jclass klass, int state)
{ {
...@@ -141,39 +172,6 @@ _Jv_WaitForState (jclass klass, int state) ...@@ -141,39 +172,6 @@ _Jv_WaitForState (jclass klass, int state)
throw new java::lang::LinkageError; throw new java::lang::LinkageError;
} }
// Finish linking a class. Only called from ClassLoader::resolveClass.
void
java::lang::ClassLoader::linkClass0 (java::lang::Class *klass)
{
_Jv_WaitForState (klass, JV_STATE_LINKED);
}
void
java::lang::ClassLoader::markClassErrorState0 (java::lang::Class *klass)
{
klass->state = JV_STATE_ERROR;
klass->notifyAll ();
}
jclass
java::lang::VMClassLoader::defineClass (java::lang::ClassLoader *cl,
jstring name,
jbyteArray data,
jint offset,
jint length)
{
return cl->defineClass (name, data, offset, length);
}
jclass
java::lang::VMClassLoader::getPrimitiveClass (jchar type)
{
char sig[2];
sig[0] = (char) type;
sig[1] = '\0';
return _Jv_FindClassFromSignature (sig, NULL);
}
typedef unsigned int uaddr __attribute__ ((mode (pointer))); typedef unsigned int uaddr __attribute__ ((mode (pointer)));
/** This function does class-preparation for compiled classes. /** This function does class-preparation for compiled classes.
...@@ -281,7 +279,7 @@ _Jv_PrepareCompiledClass (jclass klass) ...@@ -281,7 +279,7 @@ _Jv_PrepareCompiledClass (jclass klass)
// The set of initiating class loaders are used to ensure // The set of initiating class loaders are used to ensure
// safety of linking, and is maintained in the hash table // safety of linking, and is maintained in the hash table
// "initiated_classes". A defining classloader is by definition also // "initiated_classes". A defining classloader is by definition also
// initiating, so we only store classes in this table, if they have more // initiating, so we only store classes in this table if they have more
// than one class loader associated. // than one class loader associated.
// //
......
libjava/java/lang/reflect/Proxy.java
...@@ -1335,17 +1335,10 @@ public class Proxy implements Serializable ...@@ -1335,17 +1335,10 @@ public class Proxy implements Serializable
{ {
// XXX Do we require more native support here? // XXX Do we require more native support here?
// XXX Security hole - it is possible for another thread to grab the
// VMClassLoader.defineClass Method object, and abuse it while we
// have temporarily made it accessible. Do we need to add some
// synchronization lock to prevent user reflection while we use it?
// XXX This is waiting on VM support for protection domains.
Class vmClassLoader = Class.forName("java.lang.VMClassLoader"); Class vmClassLoader = Class.forName("java.lang.VMClassLoader");
Class[] types = {ClassLoader.class, String.class, Class[] types = {ClassLoader.class, String.class,
byte[].class, int.class, int.class, byte[].class, int.class, int.class,
/* ProtectionDomain.class */ }; ProtectionDomain.class };
Method m = vmClassLoader.getDeclaredMethod("defineClass", types); Method m = vmClassLoader.getDeclaredMethod("defineClass", types);
// Bypass the security check of setAccessible(true), since this // Bypass the security check of setAccessible(true), since this
...@@ -1354,7 +1347,7 @@ public class Proxy implements Serializable ...@@ -1354,7 +1347,7 @@ public class Proxy implements Serializable
m.flag = true; m.flag = true;
Object[] args = {loader, qualName, bytecode, new Integer(0), Object[] args = {loader, qualName, bytecode, new Integer(0),
new Integer(bytecode.length), new Integer(bytecode.length),
/* Object.class.getProtectionDomain() */ }; Object.class.getProtectionDomain() };
Class clazz = (Class) m.invoke(null, args); Class clazz = (Class) m.invoke(null, args);
m.flag = false; m.flag = false;
......
libjava/resolve.cc
...@@ -32,6 +32,7 @@ details. */ ...@@ -32,6 +32,7 @@ details. */
#include <java/lang/AbstractMethodError.h> #include <java/lang/AbstractMethodError.h>
#include <java/lang/NoClassDefFoundError.h> #include <java/lang/NoClassDefFoundError.h>
#include <java/lang/IncompatibleClassChangeError.h> #include <java/lang/IncompatibleClassChangeError.h>
#include <java/lang/VMClassLoader.h>
#include <java/lang/reflect/Modifier.h> #include <java/lang/reflect/Modifier.h>
using namespace gcj; using namespace gcj;
...@@ -435,7 +436,7 @@ _Jv_PrepareClass(jclass klass) ...@@ -435,7 +436,7 @@ _Jv_PrepareClass(jclass klass)
// resolved. // resolved.
if (klass->superclass) if (klass->superclass)
java::lang::ClassLoader::resolveClass0 (klass->superclass); java::lang::VMClassLoader::resolveClass (klass->superclass);
_Jv_InterpClass *clz = (_Jv_InterpClass*)klass; _Jv_InterpClass *clz = (_Jv_InterpClass*)klass;
......
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