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    1   package org.apache.bcel.verifier.statics;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import org.apache.bcel.generic.Type;
    58  import org.apache.bcel.verifier.exc.*;
    59
    60  /***
    61   * A utility class holding the information about
    62   * the names and the types of the local variables in
    63   * a given method.
    64   *
    65   * @version $Id: LocalVariablesInfo.java,v 1.2 2002/06/13 09:32:50 enver Exp $
    66   * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
    67   */
    68  public class LocalVariablesInfo{
    69
    70  	/*** The information about the local variables is stored here. */
    71  	private LocalVariableInfo[] localVariableInfos;
    72
    73  	/*** The constructor. */
    74  	LocalVariablesInfo(int max_locals){
    75  		localVariableInfos = new LocalVariableInfo[max_locals];
    76  		for (int i=0; i<max_locals; i++){
    77  			localVariableInfos[i] = new LocalVariableInfo();
    78  		}
    79  	}
    80
    81  	/*** Returns the LocalVariableInfo for the given slot. */
    82  	public LocalVariableInfo getLocalVariableInfo(int slot){
    83  		if (slot < 0 || slot >= localVariableInfos.length){
    84  			throw new AssertionViolatedException("Slot number for local variable information out of range.");
    85  		}
    86  		return localVariableInfos[slot];
    87  	}
    88
    89  	/***
    90  	 * Adds information about the local variable in slot 'slot'. Automatically
    91  	 * adds information for slot+1 if 't' is Type.LONG or Type.DOUBLE.
    92  	 * @throws LocalVariableInfoInconsistentException if the new information conflicts
    93  	 *         with already gathered information.
    94  	 */
    95  	public void add(int slot, String name, int startpc, int length, Type t) throws LocalVariableInfoInconsistentException{
    96  		// The add operation on LocalVariableInfo may throw the '...Inconsistent...' exception, we don't throw it explicitely here.
    97
    98  		if (slot < 0 || slot >= localVariableInfos.length){
    99  			throw new AssertionViolatedException("Slot number for local variable information out of range.");
    100 		}
    101
    102 		localVariableInfos[slot].add(name, startpc, length, t);
    103 		if (t == Type.LONG) localVariableInfos[slot+1].add(name, startpc, length, LONG_Upper.theInstance());
    104 		if (t == Type.DOUBLE) localVariableInfos[slot+1].add(name, startpc, length, DOUBLE_Upper.theInstance());
    105 	}
    106 }

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