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Code_attribute.java

package ca.mcgill.sable.soot.coffi;

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Jimple, a 3-address code Java(TM) bytecode representation.        *
 * Copyright (C) 1997, 1998 Raja Vallee-Rai (kor@sable.mcgill.ca)    *
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project of the Sable Research Group,      *
 * School of Computer Science, McGill University, Canada             *
 * (http://www.sable.mcgill.ca/).  It is understood that any         *
 * modification not identified as such is not covered by the         *
 * preceding statement.                                              *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this library; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other Sable Research Group projects, please      *
 * visit the web site: http://www.sable.mcgill.ca/                   *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Coffi, a bytecode parser for the Java(TM) language.               *
 * Copyright (C) 1996, 1997 Clark Verbrugge (clump@sable.mcgill.ca). *
 * All rights reserved.                                              *
 *                                                                   *
 * This work was done as a project of the Sable Research Group,      *
 * School of Computer Science, McGill University, Canada             *
 * (http://www.sable.mcgill.ca/).  It is understood that any         *
 * modification not identified as such is not covered by the         *
 * preceding statement.                                              *
 *                                                                   *
 * This work is free software; you can redistribute it and/or        *
 * modify it under the terms of the GNU Library General Public       *
 * License as published by the Free Software Foundation; either      *
 * version 2 of the License, or (at your option) any later version.  *
 *                                                                   *
 * This work 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 *
 * Library General Public License for more details.                  *
 *                                                                   *
 * You should have received a copy of the GNU Library General Public *
 * License along with this library; if not, write to the             *
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
 * Boston, MA  02111-1307, USA.                                      *
 *                                                                   *
 * Java is a trademark of Sun Microsystems, Inc.                     *
 *                                                                   *
 * To submit a bug report, send a comment, or get the latest news on *
 * this project and other Sable Research Group projects, please      *
 * visit the web site: http://www.sable.mcgill.ca/                   *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 Reference Version
 -----------------
 This is the latest official version on which this file is based.
 The reference version is: $CoffiVersion: 1.1 $
                           $SootVersion: 1.beta.4 $

 Change History
 --------------
 A) Notes:

 Please use the following template.  Most recent changes should
 appear at the top of the list.

 - Modified on [date (March 1, 1900)] by [name]. [(*) if appropriate]
   [description of modification].

 Any Modification flagged with "(*)" was done as a project of the
 Sable Research Group, School of Computer Science,
 McGill University, Canada (http://www.sable.mcgill.ca/).

 You should add your copyright, using the following template, at
 the top of this file, along with other copyrights.

 *                                                                   *
 * Modifications by [name] are                                       *
 * Copyright (C) [year(s)] [your name (or company)].  All rights     *
 * reserved.                                                         *
 *                                                                   *

 B) Changes:
 
 - Modified on November 13, 1998 by Raja Vallee-Rai (kor@sable.mcgill.ca) (*)
   Changed some short's to int's to properly contain unsigned
   short values.
 
 - Modified on November 13, 1998 by Raja Vallee-Rai (kor@sable.mcgill.ca) (*)
   Changed some short's to int's to properly contain unsigned
   short values.

 - Modified on November 2, 1998 by Raja Vallee-Rai (kor@sable.mcgill.ca) (*)
   Repackaged all source files and performed extensive modifications.
   First initial release of Soot.

 - Modified on 15-Jun-1998 by Raja Vallee-Rai (kor@sable.mcgill.ca). (*)
   First internal release (Version 0.1).
*/

import java.io.*;

/** There should be exactly one code attribute in every method; there
 * may also be a code attribute associated with a field (as an
 * initializer).
 * @see attribute_info
 * @see method_info#attributes
 * @see field_info#attributes
 * @see ClassFile@attributes
 * @author Clark Verbrugge
 */
class Code_attribute extends attribute_info {
   /** Maximum size of the operand stack. */
   public int max_stack;
   /** Maximum number of locals required. */

   public int max_locals;
   /** Length of code array. */
   public long code_length;
   /** Actual array of bytecode. */
   public byte code[];
   /** Length of exception table array. */
   public int exception_table_length;
   /** Exception table array.
    * @see exception_table_entry
    */
   public exception_table_entry exception_table[];
   /** Length of attributes array. */
   int attributes_count;
   /** Array of attributes.
    * @see attribute_info
    */
   attribute_info attributes[];

   /** Locates the LocalVariableTable attribute, if one is present.
    * @return the local variable table attribute, or <i>null</i> if not found.
    * @see LocalVariableTable_attribute
    * @see method_info#makeLocals
    */
   public LocalVariableTable_attribute findLocalVariableTable() {
      int i;
      for (i=0;i<attributes_count;i++) {
         if (attributes[i] instanceof LocalVariableTable_attribute)
            return (LocalVariableTable_attribute)(attributes[i]);
      }
      return null;
   }   
}

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