| /* Location.java -- class to read/write JDWP locations |
| Copyright (C) 2005, 2006 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 gnu.classpath.jdwp.util; |
| |
| import gnu.classpath.jdwp.VMIdManager; |
| import gnu.classpath.jdwp.VMMethod; |
| import gnu.classpath.jdwp.exception.JdwpException; |
| import gnu.classpath.jdwp.id.ClassReferenceTypeId; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * A class to read/write JDWP locations. |
| * |
| * @author Aaron Luchko <aluchko@redhat.com> |
| */ |
| public class Location |
| { |
| private VMMethod method; |
| private long index; |
| |
| /** |
| * Create a location with the given parameters. |
| * |
| * @param method the method |
| * @param index location in the method |
| */ |
| public Location(VMMethod method, long index) |
| { |
| this.method = method; |
| this.index = index; |
| } |
| |
| /** |
| * Read a location from the given bytebuffer, consists of a TAG (byte), |
| * followed by a ReferenceTypeId, a MethodId and an index (long). |
| * |
| * @param bb this holds the location |
| * @throws IOException when an error occurs reading from the buffer |
| * @throws JdwpException for invalid class or method IDs |
| */ |
| public Location(ByteBuffer bb) |
| throws IOException, JdwpException |
| { |
| byte tag = bb.get(); |
| ClassReferenceTypeId classId = |
| (ClassReferenceTypeId) VMIdManager.getDefault().readReferenceTypeId(bb); |
| Class klass = classId.getType(); |
| method = VMMethod.readId(klass, bb); |
| index = bb.getLong(); |
| } |
| |
| /** |
| * Write the given location to an output stream. |
| * |
| * @param os stream to write to |
| * @throws IOException when an error occurs writing to the stream |
| */ |
| public void write(DataOutputStream os) |
| throws IOException |
| { |
| // check if this is an empty location |
| if (method != null) |
| { |
| VMIdManager idm = VMIdManager.getDefault(); |
| ClassReferenceTypeId crti = |
| (ClassReferenceTypeId) |
| idm.getReferenceTypeId(method.getDeclaringClass()); |
| |
| crti.writeTagged(os); |
| method.writeId(os); |
| os.writeLong(index); |
| } |
| else |
| { |
| os.writeByte(1); |
| os.writeLong((long) 0); |
| os.writeLong((long) 0); |
| os.writeLong((long) 0); |
| } |
| } |
| |
| /** |
| * Sets up an empty location |
| * |
| * @return new Location (setup as empty) |
| */ |
| public static Location getEmptyLocation() |
| { |
| return new Location(null, 0); |
| } |
| |
| /** |
| * Gets the method of this location |
| * |
| * @return the method |
| */ |
| public VMMethod getMethod() |
| { |
| return method; |
| } |
| |
| /** |
| * Gets the code index of this location |
| * |
| * @return the code index |
| */ |
| public long getIndex () |
| { |
| return index; |
| } |
| |
| // convenient for debugging |
| public String toString () |
| { |
| return method.toString () + "." + index; |
| } |
| } |