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790 lines
22 KiB
790 lines
22 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.generic;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import com.sun.org.apache.bcel.internal.classfile.*;
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import java.util.HashMap;
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/**
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* This class is used to build up a constant pool. The user adds
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* constants via `addXXX' methods, `addString', `addClass',
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* etc.. These methods return an index into the constant
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* pool. Finally, `getFinalConstantPool()' returns the constant pool
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* built up. Intermediate versions of the constant pool can be
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* obtained with `getConstantPool()'. A constant pool has capacity for
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* Constants.MAX_SHORT entries. Note that the first (0) is used by the
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* JVM and that Double and Long constants need two slots.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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* @see Constant
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*/
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public class ConstantPoolGen implements java.io.Serializable {
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protected int size = 1024; // Inital size, sufficient in most cases
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protected Constant[] constants = new Constant[size];
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protected int index = 1; // First entry (0) used by JVM
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private static final String METHODREF_DELIM = ":";
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private static final String IMETHODREF_DELIM = "#";
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private static final String FIELDREF_DELIM = "&";
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private static final String NAT_DELIM = "%";
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private static class Index implements java.io.Serializable {
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int index;
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Index(int i) { index = i; }
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}
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/**
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* Initialize with given array of constants.
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*
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* @param c array of given constants, new ones will be appended
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*/
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public ConstantPoolGen(Constant[] cs) {
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if(cs.length > size) {
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size = cs.length;
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constants = new Constant[size];
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}
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System.arraycopy(cs, 0, constants, 0, cs.length);
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if(cs.length > 0)
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index = cs.length;
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for(int i=1; i < index; i++) {
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Constant c = constants[i];
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if(c instanceof ConstantString) {
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ConstantString s = (ConstantString)c;
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ConstantUtf8 u8 = (ConstantUtf8)constants[s.getStringIndex()];
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string_table.put(u8.getBytes(), new Index(i));
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} else if(c instanceof ConstantClass) {
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ConstantClass s = (ConstantClass)c;
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ConstantUtf8 u8 = (ConstantUtf8)constants[s.getNameIndex()];
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class_table.put(u8.getBytes(), new Index(i));
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} else if(c instanceof ConstantNameAndType) {
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ConstantNameAndType n = (ConstantNameAndType)c;
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ConstantUtf8 u8 = (ConstantUtf8)constants[n.getNameIndex()];
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ConstantUtf8 u8_2 = (ConstantUtf8)constants[n.getSignatureIndex()];
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n_a_t_table.put(u8.getBytes() + NAT_DELIM + u8_2.getBytes(), new Index(i));
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} else if(c instanceof ConstantUtf8) {
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ConstantUtf8 u = (ConstantUtf8)c;
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utf8_table.put(u.getBytes(), new Index(i));
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} else if(c instanceof ConstantCP) {
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ConstantCP m = (ConstantCP)c;
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ConstantClass clazz = (ConstantClass)constants[m.getClassIndex()];
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ConstantNameAndType n = (ConstantNameAndType)constants[m.getNameAndTypeIndex()];
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ConstantUtf8 u8 = (ConstantUtf8)constants[clazz.getNameIndex()];
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String class_name = u8.getBytes().replace('/', '.');
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u8 = (ConstantUtf8)constants[n.getNameIndex()];
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String method_name = u8.getBytes();
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u8 = (ConstantUtf8)constants[n.getSignatureIndex()];
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String signature = u8.getBytes();
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String delim = METHODREF_DELIM;
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if(c instanceof ConstantInterfaceMethodref)
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delim = IMETHODREF_DELIM;
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else if(c instanceof ConstantFieldref)
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delim = FIELDREF_DELIM;
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cp_table.put(class_name + delim + method_name + delim + signature, new Index(i));
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}
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}
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}
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/**
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* Initialize with given constant pool.
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*/
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public ConstantPoolGen(ConstantPool cp) {
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this(cp.getConstantPool());
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}
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/**
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* Create empty constant pool.
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*/
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public ConstantPoolGen() {}
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/** Resize internal array of constants.
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*/
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protected void adjustSize() {
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if(index + 3 >= size) {
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Constant[] cs = constants;
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size *= 2;
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constants = new Constant[size];
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System.arraycopy(cs, 0, constants, 0, index);
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}
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}
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private HashMap string_table = new HashMap();
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/**
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* Look for ConstantString in ConstantPool containing String `str'.
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*
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* @param str String to search for
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* @return index on success, -1 otherwise
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*/
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public int lookupString(String str) {
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Index index = (Index)string_table.get(str);
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return (index != null)? index.index : -1;
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}
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/**
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* Add a new String constant to the ConstantPool, if it is not already in there.
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*
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* @param str String to add
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* @return index of entry
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*/
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public int addString(String str) {
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int ret;
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if((ret = lookupString(str)) != -1)
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return ret; // Already in CP
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int utf8 = addUtf8(str);
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adjustSize();
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ConstantString s = new ConstantString(utf8);
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ret = index;
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constants[index++] = s;
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string_table.put(str, new Index(ret));
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return ret;
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}
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private HashMap class_table = new HashMap();
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/**
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* Look for ConstantClass in ConstantPool named `str'.
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*
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* @param str String to search for
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* @return index on success, -1 otherwise
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*/
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public int lookupClass(String str) {
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Index index = (Index)class_table.get(str.replace('.', '/'));
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return (index != null)? index.index : -1;
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}
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private int addClass_(String clazz) {
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int ret;
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if((ret = lookupClass(clazz)) != -1)
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return ret; // Already in CP
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adjustSize();
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ConstantClass c = new ConstantClass(addUtf8(clazz));
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ret = index;
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constants[index++] = c;
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class_table.put(clazz, new Index(ret));
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return ret;
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}
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/**
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* Add a new Class reference to the ConstantPool, if it is not already in there.
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*
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* @param str Class to add
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* @return index of entry
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*/
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public int addClass(String str) {
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return addClass_(str.replace('.', '/'));
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}
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/**
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* Add a new Class reference to the ConstantPool for a given type.
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*
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* @param str Class to add
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* @return index of entry
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*/
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public int addClass(ObjectType type) {
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return addClass(type.getClassName());
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}
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/**
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* Add a reference to an array class (e.g. String[][]) as needed by MULTIANEWARRAY
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* instruction, e.g. to the ConstantPool.
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*
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* @param type type of array class
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* @return index of entry
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*/
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public int addArrayClass(ArrayType type) {
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return addClass_(type.getSignature());
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}
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/**
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* Look for ConstantInteger in ConstantPool.
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*
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* @param n integer number to look for
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* @return index on success, -1 otherwise
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*/
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public int lookupInteger(int n) {
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for(int i=1; i < index; i++) {
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if(constants[i] instanceof ConstantInteger) {
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ConstantInteger c = (ConstantInteger)constants[i];
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if(c.getBytes() == n)
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return i;
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}
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}
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return -1;
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}
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/**
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* Add a new Integer constant to the ConstantPool, if it is not already in there.
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*
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* @param n integer number to add
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* @return index of entry
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*/
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public int addInteger(int n) {
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int ret;
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if((ret = lookupInteger(n)) != -1)
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return ret; // Already in CP
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adjustSize();
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ret = index;
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constants[index++] = new ConstantInteger(n);
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return ret;
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}
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/**
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* Look for ConstantFloat in ConstantPool.
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*
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* @param n Float number to look for
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* @return index on success, -1 otherwise
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*/
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public int lookupFloat(float n) {
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int bits = Float.floatToIntBits(n);
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for(int i=1; i < index; i++) {
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if(constants[i] instanceof ConstantFloat) {
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ConstantFloat c = (ConstantFloat)constants[i];
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if(Float.floatToIntBits(c.getBytes()) == bits)
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return i;
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}
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}
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return -1;
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}
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/**
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* Add a new Float constant to the ConstantPool, if it is not already in there.
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*
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* @param n Float number to add
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* @return index of entry
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*/
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public int addFloat(float n) {
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int ret;
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if((ret = lookupFloat(n)) != -1)
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return ret; // Already in CP
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adjustSize();
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ret = index;
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constants[index++] = new ConstantFloat(n);
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return ret;
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}
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private HashMap utf8_table = new HashMap();
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/**
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* Look for ConstantUtf8 in ConstantPool.
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*
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* @param n Utf8 string to look for
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* @return index on success, -1 otherwise
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*/
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public int lookupUtf8(String n) {
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Index index = (Index)utf8_table.get(n);
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return (index != null)? index.index : -1;
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}
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/**
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* Add a new Utf8 constant to the ConstantPool, if it is not already in there.
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*
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* @param n Utf8 string to add
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* @return index of entry
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*/
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public int addUtf8(String n) {
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int ret;
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if((ret = lookupUtf8(n)) != -1)
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return ret; // Already in CP
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adjustSize();
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ret = index;
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constants[index++] = new ConstantUtf8(n);
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utf8_table.put(n, new Index(ret));
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return ret;
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}
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/**
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* Look for ConstantLong in ConstantPool.
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*
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* @param n Long number to look for
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* @return index on success, -1 otherwise
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*/
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public int lookupLong(long n) {
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for(int i=1; i < index; i++) {
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if(constants[i] instanceof ConstantLong) {
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ConstantLong c = (ConstantLong)constants[i];
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if(c.getBytes() == n)
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return i;
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}
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}
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return -1;
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}
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/**
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* Add a new long constant to the ConstantPool, if it is not already in there.
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*
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* @param n Long number to add
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* @return index of entry
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*/
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public int addLong(long n) {
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int ret;
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if((ret = lookupLong(n)) != -1)
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return ret; // Already in CP
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adjustSize();
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ret = index;
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constants[index] = new ConstantLong(n);
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index += 2; // Wastes one entry according to spec
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return ret;
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}
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/**
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* Look for ConstantDouble in ConstantPool.
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*
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* @param n Double number to look for
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* @return index on success, -1 otherwise
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*/
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public int lookupDouble(double n) {
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long bits = Double.doubleToLongBits(n);
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for(int i=1; i < index; i++) {
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if(constants[i] instanceof ConstantDouble) {
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ConstantDouble c = (ConstantDouble)constants[i];
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if(Double.doubleToLongBits(c.getBytes()) == bits)
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return i;
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}
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}
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return -1;
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}
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/**
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* Add a new double constant to the ConstantPool, if it is not already in there.
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*
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* @param n Double number to add
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* @return index of entry
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*/
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public int addDouble(double n) {
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int ret;
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if((ret = lookupDouble(n)) != -1)
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return ret; // Already in CP
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adjustSize();
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ret = index;
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constants[index] = new ConstantDouble(n);
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index += 2; // Wastes one entry according to spec
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return ret;
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}
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private HashMap n_a_t_table = new HashMap();
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/**
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* Look for ConstantNameAndType in ConstantPool.
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*
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* @param name of variable/method
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* @param signature of variable/method
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* @return index on success, -1 otherwise
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*/
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public int lookupNameAndType(String name, String signature) {
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Index index = (Index)n_a_t_table.get(name + NAT_DELIM + signature);
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return (index != null)? index.index : -1;
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}
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/**
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* Add a new NameAndType constant to the ConstantPool if it is not already
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* in there.
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*
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* @param n NameAndType string to add
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* @return index of entry
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*/
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public int addNameAndType(String name, String signature) {
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int ret;
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int name_index, signature_index;
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if((ret = lookupNameAndType(name, signature)) != -1)
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return ret; // Already in CP
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adjustSize();
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name_index = addUtf8(name);
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signature_index = addUtf8(signature);
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ret = index;
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constants[index++] = new ConstantNameAndType(name_index, signature_index);
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n_a_t_table.put(name + NAT_DELIM + signature, new Index(ret));
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return ret;
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}
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private HashMap cp_table = new HashMap();
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/**
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* Look for ConstantMethodref in ConstantPool.
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*
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* @param class_name Where to find method
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* @param method_name Guess what
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* @param signature return and argument types
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* @return index on success, -1 otherwise
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*/
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public int lookupMethodref(String class_name, String method_name, String signature) {
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Index index = (Index)cp_table.get(class_name + METHODREF_DELIM + method_name +
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METHODREF_DELIM + signature);
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return (index != null)? index.index : -1;
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}
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public int lookupMethodref(MethodGen method) {
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return lookupMethodref(method.getClassName(), method.getName(),
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method.getSignature());
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}
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/**
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* Add a new Methodref constant to the ConstantPool, if it is not already
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* in there.
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*
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* @param n Methodref string to add
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* @return index of entry
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*/
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public int addMethodref(String class_name, String method_name, String signature) {
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int ret, class_index, name_and_type_index;
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if((ret = lookupMethodref(class_name, method_name, signature)) != -1)
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return ret; // Already in CP
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adjustSize();
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name_and_type_index = addNameAndType(method_name, signature);
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class_index = addClass(class_name);
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ret = index;
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constants[index++] = new ConstantMethodref(class_index, name_and_type_index);
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cp_table.put(class_name + METHODREF_DELIM + method_name +
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METHODREF_DELIM + signature, new Index(ret));
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return ret;
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}
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public int addMethodref(MethodGen method) {
|
|
return addMethodref(method.getClassName(), method.getName(),
|
|
method.getSignature());
|
|
}
|
|
|
|
/**
|
|
* Look for ConstantInterfaceMethodref in ConstantPool.
|
|
*
|
|
* @param class_name Where to find method
|
|
* @param method_name Guess what
|
|
* @param signature return and argument types
|
|
* @return index on success, -1 otherwise
|
|
*/
|
|
public int lookupInterfaceMethodref(String class_name, String method_name, String signature) {
|
|
Index index = (Index)cp_table.get(class_name + IMETHODREF_DELIM + method_name +
|
|
IMETHODREF_DELIM + signature);
|
|
return (index != null)? index.index : -1;
|
|
}
|
|
|
|
public int lookupInterfaceMethodref(MethodGen method) {
|
|
return lookupInterfaceMethodref(method.getClassName(), method.getName(),
|
|
method.getSignature());
|
|
}
|
|
|
|
/**
|
|
* Add a new InterfaceMethodref constant to the ConstantPool, if it is not already
|
|
* in there.
|
|
*
|
|
* @param n InterfaceMethodref string to add
|
|
* @return index of entry
|
|
*/
|
|
public int addInterfaceMethodref(String class_name, String method_name, String signature) {
|
|
int ret, class_index, name_and_type_index;
|
|
|
|
if((ret = lookupInterfaceMethodref(class_name, method_name, signature)) != -1)
|
|
return ret; // Already in CP
|
|
|
|
adjustSize();
|
|
|
|
class_index = addClass(class_name);
|
|
name_and_type_index = addNameAndType(method_name, signature);
|
|
ret = index;
|
|
constants[index++] = new ConstantInterfaceMethodref(class_index, name_and_type_index);
|
|
|
|
cp_table.put(class_name + IMETHODREF_DELIM + method_name +
|
|
IMETHODREF_DELIM + signature, new Index(ret));
|
|
|
|
return ret;
|
|
}
|
|
|
|
public int addInterfaceMethodref(MethodGen method) {
|
|
return addInterfaceMethodref(method.getClassName(), method.getName(),
|
|
method.getSignature());
|
|
}
|
|
|
|
/**
|
|
* Look for ConstantFieldref in ConstantPool.
|
|
*
|
|
* @param class_name Where to find method
|
|
* @param field_name Guess what
|
|
* @param signature return and argument types
|
|
* @return index on success, -1 otherwise
|
|
*/
|
|
public int lookupFieldref(String class_name, String field_name, String signature) {
|
|
Index index = (Index)cp_table.get(class_name + FIELDREF_DELIM + field_name +
|
|
FIELDREF_DELIM + signature);
|
|
return (index != null)? index.index : -1;
|
|
}
|
|
|
|
/**
|
|
* Add a new Fieldref constant to the ConstantPool, if it is not already
|
|
* in there.
|
|
*
|
|
* @param n Fieldref string to add
|
|
* @return index of entry
|
|
*/
|
|
public int addFieldref(String class_name, String field_name, String signature) {
|
|
int ret;
|
|
int class_index, name_and_type_index;
|
|
|
|
if((ret = lookupFieldref(class_name, field_name, signature)) != -1)
|
|
return ret; // Already in CP
|
|
|
|
adjustSize();
|
|
|
|
class_index = addClass(class_name);
|
|
name_and_type_index = addNameAndType(field_name, signature);
|
|
ret = index;
|
|
constants[index++] = new ConstantFieldref(class_index, name_and_type_index);
|
|
|
|
cp_table.put(class_name + FIELDREF_DELIM + field_name + FIELDREF_DELIM + signature, new Index(ret));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @param i index in constant pool
|
|
* @return constant pool entry at index i
|
|
*/
|
|
public Constant getConstant(int i) { return constants[i]; }
|
|
|
|
/**
|
|
* Use with care!
|
|
*
|
|
* @param i index in constant pool
|
|
* @param c new constant pool entry at index i
|
|
*/
|
|
public void setConstant(int i, Constant c) { constants[i] = c; }
|
|
|
|
/**
|
|
* @return intermediate constant pool
|
|
*/
|
|
public ConstantPool getConstantPool() {
|
|
return new ConstantPool(constants);
|
|
}
|
|
|
|
/**
|
|
* @return current size of constant pool
|
|
*/
|
|
public int getSize() {
|
|
return index;
|
|
}
|
|
|
|
/**
|
|
* @return constant pool with proper length
|
|
*/
|
|
public ConstantPool getFinalConstantPool() {
|
|
Constant[] cs = new Constant[index];
|
|
|
|
System.arraycopy(constants, 0, cs, 0, index);
|
|
|
|
return new ConstantPool(cs);
|
|
}
|
|
|
|
/**
|
|
* @return String representation.
|
|
*/
|
|
public String toString() {
|
|
StringBuffer buf = new StringBuffer();
|
|
|
|
for(int i=1; i < index; i++)
|
|
buf.append(i + ")" + constants[i] + "\n");
|
|
|
|
return buf.toString();
|
|
}
|
|
|
|
/** Import constant from another ConstantPool and return new index.
|
|
*/
|
|
public int addConstant(Constant c, ConstantPoolGen cp) {
|
|
Constant[] constants = cp.getConstantPool().getConstantPool();
|
|
|
|
switch(c.getTag()) {
|
|
case Constants.CONSTANT_String: {
|
|
ConstantString s = (ConstantString)c;
|
|
ConstantUtf8 u8 = (ConstantUtf8)constants[s.getStringIndex()];
|
|
|
|
return addString(u8.getBytes());
|
|
}
|
|
|
|
case Constants.CONSTANT_Class: {
|
|
ConstantClass s = (ConstantClass)c;
|
|
ConstantUtf8 u8 = (ConstantUtf8)constants[s.getNameIndex()];
|
|
|
|
return addClass(u8.getBytes());
|
|
}
|
|
|
|
case Constants.CONSTANT_NameAndType: {
|
|
ConstantNameAndType n = (ConstantNameAndType)c;
|
|
ConstantUtf8 u8 = (ConstantUtf8)constants[n.getNameIndex()];
|
|
ConstantUtf8 u8_2 = (ConstantUtf8)constants[n.getSignatureIndex()];
|
|
|
|
return addNameAndType(u8.getBytes(), u8_2.getBytes());
|
|
}
|
|
|
|
case Constants.CONSTANT_Utf8:
|
|
return addUtf8(((ConstantUtf8)c).getBytes());
|
|
|
|
case Constants.CONSTANT_Double:
|
|
return addDouble(((ConstantDouble)c).getBytes());
|
|
|
|
case Constants.CONSTANT_Float:
|
|
return addFloat(((ConstantFloat)c).getBytes());
|
|
|
|
case Constants.CONSTANT_Long:
|
|
return addLong(((ConstantLong)c).getBytes());
|
|
|
|
case Constants.CONSTANT_Integer:
|
|
return addInteger(((ConstantInteger)c).getBytes());
|
|
|
|
case Constants.CONSTANT_InterfaceMethodref: case Constants.CONSTANT_Methodref:
|
|
case Constants.CONSTANT_Fieldref: {
|
|
ConstantCP m = (ConstantCP)c;
|
|
ConstantClass clazz = (ConstantClass)constants[m.getClassIndex()];
|
|
ConstantNameAndType n = (ConstantNameAndType)constants[m.getNameAndTypeIndex()];
|
|
ConstantUtf8 u8 = (ConstantUtf8)constants[clazz.getNameIndex()];
|
|
String class_name = u8.getBytes().replace('/', '.');
|
|
|
|
u8 = (ConstantUtf8)constants[n.getNameIndex()];
|
|
String name = u8.getBytes();
|
|
|
|
u8 = (ConstantUtf8)constants[n.getSignatureIndex()];
|
|
String signature = u8.getBytes();
|
|
|
|
switch(c.getTag()) {
|
|
case Constants.CONSTANT_InterfaceMethodref:
|
|
return addInterfaceMethodref(class_name, name, signature);
|
|
|
|
case Constants.CONSTANT_Methodref:
|
|
return addMethodref(class_name, name, signature);
|
|
|
|
case Constants.CONSTANT_Fieldref:
|
|
return addFieldref(class_name, name, signature);
|
|
|
|
default: // Never reached
|
|
throw new RuntimeException("Unknown constant type " + c);
|
|
}
|
|
}
|
|
|
|
default: // Never reached
|
|
throw new RuntimeException("Unknown constant type " + c);
|
|
}
|
|
}
|
|
}
|