1   package org.apache.bcel.verifier.statics;
2   
3   /* ====================================================================
4    * The Apache Software License, Version 1.1
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6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
7    * reserved.
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9    * Redistribution and use in source and binary forms, with or without
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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
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22   *    if any, must include the following acknowledgment:
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24   *        Apache Software Foundation (http://www.apache.org/)."
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26   *    if and wherever such third-party acknowledgments normally appear.
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28   * 4. The names "Apache" and "Apache Software Foundation" and
29   *    "Apache BCEL" must not be used to endorse or promote products
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50   *
51   * This software consists of voluntary contributions made by many
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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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