179 lines
5.4 KiB
Java
179 lines
5.4 KiB
Java
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/* VMMethod.java -- a method in a virtual machine
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import gnu.classpath.jdwp.exception.JdwpException;
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import gnu.classpath.jdwp.util.LineTable;
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import gnu.classpath.jdwp.util.VariableTable;
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/**
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* This class is really an amalgamation of two classes: one class
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* represents a virtual machine method and the other represents
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* the JDWP back-end's ID for the method.
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*
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* @author Keith Seitz (keiths@redhat.com)
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*/
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public class VMMethod
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{
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/**
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* Returns the size of a JDWP method ID
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* @see gnu.classpath.jdwp.id.JdwpId#SIZE
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*/
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public static final int SIZE = 8;
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// The class in which this method is declared
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private Class _class;
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// The method's ID
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private long _methodId;
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/**
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* Constructs a new VMMethod object. This constructor is protected
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* so that only the factory methods of VMVirtualMachine can be used
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* to create VMMethods.
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*
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* @param klass the method's containing class
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* @param id method identifier, e.g., jmethodID
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* @see gnu.classpath.jdwp.VMVirtualMachine#getAllClassMethods
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* @see gnu.classpath.jdwp.VMVirtualMachine#getClassMethod
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*/
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protected VMMethod(Class klass, long id)
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{
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_class = klass;
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_methodId = id;
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}
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/**
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* Returns the internal method ID for this method
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*/
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public long getId()
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{
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return _methodId;
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}
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/**
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* Returns the method's declaring class
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*/
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public Class getDeclaringClass()
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{
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return _class;
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}
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/**
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* Returns the name of this method
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*/
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public String getName() { return null; }
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/**
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* Returns the signature of this method
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*/
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public String getSignature() { return null; }
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/**
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* Returns the method's modifier flags
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*/
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public int getModifiers() { return -1; }
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/**
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* "Returns line number information for the method, if present. The line
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* table maps source line numbers to the initial code index of the line.
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* The line table is ordered by code index (from lowest to highest). The
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* line number information is constant unless a new class definition is
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* installed using RedefineClasses."
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*
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* @return the line table
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* @throws JdwpException
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*/
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public LineTable getLineTable()
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{ return null; }
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/**
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* "Returns variable information for the method. The variable table
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* includes arguments and locals declared within the method. For instance
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* methods, the "this" reference is included in the table. Also, synthetic
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* variables may be present."
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*
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* @return the variable table
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* @throws JdwpException
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*/
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public VariableTable getVariableTable()
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{ return null; }
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/**
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* Returns a string representation of this method (not
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* required but nice for debugging).
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*/
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public String toString()
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{
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return getDeclaringClass().getName() + "." + getName();
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}
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/**
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* Writes the method's ID to the output stream
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*
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* @param ostream the output stream to which to write
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* @throws IOException for any errors writing to the stream
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* @see gnu.classpath.jdwp.id.JdwpId#write
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*/
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public void writeId(DataOutputStream ostream)
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throws IOException
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{
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ostream.writeLong(getId());
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}
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/**
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* Returns a VMMethod from the ID in the byte buffer
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*
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* @param klass the method's declaring class
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* @param bb a ByteBuffer containing the method's ID
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* @throws JdwpException for any errors creating the method
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* @throws IOException for any errors reading from the buffer
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*/
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public static VMMethod readId(Class klass, ByteBuffer bb)
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throws JdwpException, IOException
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{
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return VMVirtualMachine.getClassMethod(klass, bb.getLong());
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}
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}
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