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/*
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* Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package com.sun.tools.javac.jvm;
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import java.util.*;
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import com.sun.tools.javac.code.Symbol.*;
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/** An internal structure that corresponds to the constant pool of a classfile.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If
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* you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class Pool {
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public static final int MAX_ENTRIES = 0xFFFF;
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public static final int MAX_STRING_LENGTH = 0xFFFF;
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/** Index of next constant to be entered.
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*/
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int pp;
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/** The initial pool buffer.
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*/
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Object[] pool;
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/** A hashtable containing all constants in the pool.
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*/
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Map<Object,Integer> indices;
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/** Construct a pool with given number of elements and element array.
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*/
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public Pool(int pp, Object[] pool) {
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this.pp = pp;
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this.pool = pool;
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this.indices = new HashMap<Object,Integer>(pool.length);
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for (int i = 1; i < pp; i++) {
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if (pool[i] != null) indices.put(pool[i], i);
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}
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}
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/** Construct an empty pool.
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*/
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public Pool() {
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this(1, new Object[64]);
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}
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/** Return the number of entries in the constant pool.
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*/
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public int numEntries() {
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return pp;
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}
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/** Remove everything from this pool.
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*/
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public void reset() {
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pp = 1;
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indices.clear();
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}
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/** Double pool buffer in size.
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*/
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private void doublePool() {
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Object[] newpool = new Object[pool.length * 2];
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System.arraycopy(pool, 0, newpool, 0, pool.length);
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pool = newpool;
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}
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/** Place an object in the pool, unless it is already there.
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* If object is a symbol also enter its owner unless the owner is a
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* package. Return the object's index in the pool.
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*/
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public int put(Object value) {
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if (value instanceof MethodSymbol)
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value = new Method((MethodSymbol)value);
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else if (value instanceof VarSymbol)
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value = new Variable((VarSymbol)value);
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// assert !(value instanceof Type.TypeVar);
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Integer index = indices.get(value);
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if (index == null) {
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// System.err.println("put " + value + " " + value.getClass());//DEBUG
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index = pp;
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indices.put(value, index);
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if (pp == pool.length) doublePool();
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pool[pp++] = value;
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if (value instanceof Long || value instanceof Double) {
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if (pp == pool.length) doublePool();
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pool[pp++] = null;
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}
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}
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return index.intValue();
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}
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/** Return the given object's index in the pool,
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* or -1 if object is not in there.
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*/
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public int get(Object o) {
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Integer n = indices.get(o);
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return n == null ? -1 : n.intValue();
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}
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static class Method extends DelegatedSymbol {
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MethodSymbol m;
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Method(MethodSymbol m) {
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super(m);
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this.m = m;
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}
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public boolean equals(Object other) {
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if (!(other instanceof Method)) return false;
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MethodSymbol o = ((Method)other).m;
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return
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o.name == m.name &&
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o.owner == m.owner &&
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o.type.equals(m.type);
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}
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public int hashCode() {
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return
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m.name.hashCode() * 33 +
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m.owner.hashCode() * 9 +
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m.type.hashCode();
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}
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}
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static class Variable extends DelegatedSymbol {
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VarSymbol v;
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Variable(VarSymbol v) {
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super(v);
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this.v = v;
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}
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public boolean equals(Object other) {
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if (!(other instanceof Variable)) return false;
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VarSymbol o = ((Variable)other).v;
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return
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o.name == v.name &&
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o.owner == v.owner &&
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o.type.equals(v.type);
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}
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public int hashCode() {
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return
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v.name.hashCode() * 33 +
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v.owner.hashCode() * 9 +
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v.type.hashCode();
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}
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}
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}
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