1 /*
   2  * Copyright 2000-2008 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.debugger;
  26 
  27 /** <P> This is the bottom-most interface which abstracts address
  28     access for both debugging and introspection. In the situation of
  29     debugging a target VM, these routines can throw the specified
  30     RuntimeExceptions to indicate failure and allow recovery of the
  31     debugging system. If these are used for introspecting the current
  32     VM and implementing functionality in it, however, it is expected
  33     that these kinds of failures will not occur and, in fact, a crash
  34     will occur if the situation arises where they would have been
  35     thrown. </P>
  36 
  37     <P> Addresses are immutable. Further, it was decided not to expose
  38     the representation of the Address (and provide a corresponding
  39     factory method from, for example, long to Address). Unfortunately,
  40     because of the existence of C and "reuse" of low bits of pointers,

   1 /*
   2  * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores,
  20  * CA 94065 USA or visit www.oracle.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.debugger;
  26 
  27 /** <P> This is the bottom-most interface which abstracts address
  28     access for both debugging and introspection. In the situation of
  29     debugging a target VM, these routines can throw the specified
  30     RuntimeExceptions to indicate failure and allow recovery of the
  31     debugging system. If these are used for introspecting the current
  32     VM and implementing functionality in it, however, it is expected
  33     that these kinds of failures will not occur and, in fact, a crash
  34     will occur if the situation arises where they would have been
  35     thrown. </P>
  36 
  37     <P> Addresses are immutable. Further, it was decided not to expose
  38     the representation of the Address (and provide a corresponding
  39     factory method from, for example, long to Address). Unfortunately,
  40     because of the existence of C and "reuse" of low bits of pointers,