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135 lines
3.7 KiB
135 lines
3.7 KiB
/* LocalVariableInfo Copyright (C) 1999 Jochen Hoenicke.
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*
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* This program 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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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.bytecode;
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import net.sf.jode.util.UnifyHash;
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///#def COLLECTIONS java.util
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import java.util.Iterator;
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///#enddef
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/**
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* A simple class containing the info of the LocalVariableTable. This
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* info is stored decentral: every load, store or iinc instruction contains
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* the info for its local. When writing code it will automatically be
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* collected again. <br>
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*
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* You can't modify a LocalVariableInfo, for this reason they can and
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* will be shared.<br>
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*
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* This information consists of name, type signature and slot number.
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* There is no public constructor; use the static getInfo() methods
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* instead.
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*/
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public final class LocalVariableInfo {
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private String name, type;
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private int slot;
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private static LocalVariableInfo anonymous[];
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static {
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grow(5);
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}
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private static final UnifyHash unifier = new UnifyHash();
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private LocalVariableInfo(int slot) {
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this.slot = slot;
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}
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private LocalVariableInfo(int slot, String name, String type) {
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this.slot = slot;
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this.name = name;
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this.type = type;
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}
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private static void grow(int upper) {
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LocalVariableInfo[] newAnon = new LocalVariableInfo[upper];
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int start = 0;
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if (anonymous != null) {
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start = anonymous.length;
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System.arraycopy(anonymous, 0, newAnon, 0, start);
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}
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anonymous = newAnon;
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for (int i=start; i< upper; i++)
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anonymous[i] = new LocalVariableInfo(i);
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}
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/**
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* Creates a new local variable info, with no name or type.
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* @param slot the slot number.
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*/
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public static LocalVariableInfo getInfo(int slot) {
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if (slot >= anonymous.length)
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grow(Math.max(slot + 1, anonymous.length * 2));
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return anonymous[slot];
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}
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/**
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* Creates a new local variable info, with given name and type.
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* @param slot the slot number.
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* @param name the name of the local.
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* @param type the type signature of the local.
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*/
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public static LocalVariableInfo getInfo(int slot,
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String name, String type) {
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if (name == null && type == null)
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return getInfo(slot);
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int hash = slot ^ name.hashCode() ^ type.hashCode();
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Iterator iter = unifier.iterateHashCode(hash);
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while (iter.hasNext()) {
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LocalVariableInfo lvi = (LocalVariableInfo) iter.next();
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if (lvi.slot == slot
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&& lvi.name.equals(name)
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&& lvi.type.equals(type))
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return lvi;
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}
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LocalVariableInfo lvi = new LocalVariableInfo(slot, name, type);
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unifier.put(hash, lvi);
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return lvi;
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}
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/**
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* Gets the slot number.
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*/
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public int getSlot() {
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return slot;
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}
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/**
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* Gets the name.
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*/
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public String getName() {
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return name;
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}
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/**
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* Gets the type signature.
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* @see TypeSignature
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*/
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public String getType() {
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return type;
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}
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/**
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* Gets a string representation for debugging purposes.
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*/
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public String toString() {
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String result = ""+slot;
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if (name != null)
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result += " ["+name+","+type+"]";
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return result;
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}
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}
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