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291 lines
8.7 KiB
291 lines
8.7 KiB
/* ConstantPool Copyright (C) 1998-1999 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 jode.bytecode;
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import java.io.*;
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import jode.type.Type;
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/**
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* This class represent the constant pool.
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*
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* @author Jochen Hoenicke
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*/
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public class ConstantPool {
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public final static int CLASS = 7;
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public final static int FIELDREF = 9;
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public final static int METHODREF = 10;
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public final static int INTERFACEMETHODREF = 11;
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public final static int STRING = 8;
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public final static int INTEGER = 3;
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public final static int FLOAT = 4;
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public final static int LONG = 5;
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public final static int DOUBLE = 6;
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public final static int NAMEANDTYPE = 12;
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public final static int UTF8 = 1;
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int count;
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int[] tags;
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int[] indices1, indices2;
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Object[] constants;
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void checkClassName(String clName) throws ClassFormatException {
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boolean start = true;
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for (int i=0; i< clName.length(); i++) {
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char c = clName.charAt(i);
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if (c == '/')
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start = true;
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else if (start && Character.isJavaIdentifierStart(c))
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start = false;
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else if ((start && false /*XXX*/)
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|| !Character.isJavaIdentifierPart(c))
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throw new ClassFormatException("Illegal java class name: "
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+ clName);
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}
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}
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void checkTypeSig(String typesig, boolean isMethod)
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throws ClassFormatException {
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try {
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int i = 0;
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if (isMethod) {
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if (typesig.charAt(i++) != '(')
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throw new ClassFormatException
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("Type sig doesn't match tag: "+typesig);
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while (typesig.charAt(i) != ')') {
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while (typesig.charAt(i) == '[') {
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i++;
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if (i >= typesig.length())
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throw new ClassFormatException
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("Type sig error: "+typesig);
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}
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if (typesig.charAt(i) == 'L') {
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int end = typesig.indexOf(';', i);
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if (end == -1)
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throw new ClassFormatException
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("Type sig error: "+typesig);
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checkClassName(typesig.substring(i+1, end));
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i = end;
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} else {
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if ("ZBSCIJFD".indexOf(typesig.charAt(i)) == -1)
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throw new ClassFormatException
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("Type sig error: "+typesig);
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}
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i++;
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}
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i++;
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}
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while (typesig.charAt(i) == '[')
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i++;
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if (typesig.charAt(i) == 'L') {
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int end = typesig.indexOf(';', i);
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if (i == -1)
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throw new ClassFormatException
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("Type sig error: "+typesig);
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checkClassName(typesig.substring(i+1, end));
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i = end;
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} else {
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if ("ZBSCIJFD".indexOf(typesig.charAt(i)) == -1)
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if (!isMethod || typesig.charAt(i) != 'V')
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throw new ClassFormatException
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("Type sig error: "+typesig);
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}
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if (i+1 != typesig.length())
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throw new ClassFormatException
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("Type sig error: "+typesig);
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} catch (StringIndexOutOfBoundsException ex) {
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throw new ClassFormatException
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("Incomplete type sig: "+typesig);
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}
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}
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public ConstantPool () {
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}
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public void read(DataInputStream stream)
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throws IOException {
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count = stream.readUnsignedShort();
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tags = new int[count];
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indices1 = new int[count];
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indices2 = new int[count];
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constants = new Object[count];
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for (int i=1; i< count; i++) {
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int tag = stream.readUnsignedByte();
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tags[i] = tag;
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switch (tag) {
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case CLASS:
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indices1[i] = stream.readUnsignedShort();
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break;
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case FIELDREF:
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case METHODREF:
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case INTERFACEMETHODREF:
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indices1[i] = stream.readUnsignedShort();
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indices2[i] = stream.readUnsignedShort();
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break;
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case STRING:
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indices1[i] = stream.readUnsignedShort();
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break;
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case INTEGER:
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constants[i] = new Integer(stream.readInt());
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break;
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case FLOAT:
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constants[i] = new Float(stream.readFloat());
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break;
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case LONG:
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constants[i] = new Long(stream.readLong());
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tags[++i] = -LONG;
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break;
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case DOUBLE:
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constants[i] = new Double(stream.readDouble());
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tags[++i] = -DOUBLE;
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break;
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case NAMEANDTYPE:
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indices1[i] = stream.readUnsignedShort();
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indices2[i] = stream.readUnsignedShort();
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break;
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case UTF8:
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constants[i] = stream.readUTF().intern();
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break;
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default:
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throw new ClassFormatException("unknown constant tag");
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}
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}
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}
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public int getTag(int i) throws ClassFormatException {
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if (i == 0)
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throw new ClassFormatException("null tag");
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return tags[i];
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}
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public String getUTF8(int i) throws ClassFormatException {
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if (i == 0)
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return null;
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if (tags[i] != UTF8)
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throw new ClassFormatException("Tag mismatch");
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return (String)constants[i];
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}
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public Reference getRef(int i) throws ClassFormatException {
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if (i == 0)
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return null;
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if (tags[i] != FIELDREF
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&& tags[i] != METHODREF && tags[i] != INTERFACEMETHODREF)
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throw new ClassFormatException("Tag mismatch");
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if (constants[i] == null) {
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int classIndex = indices1[i];
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int nameTypeIndex = indices2[i];
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if (tags[nameTypeIndex] != NAMEANDTYPE)
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throw new ClassFormatException("Tag mismatch");
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String type = getUTF8(indices2[nameTypeIndex]);
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checkTypeSig(type, tags[i] != FIELDREF);
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String clName = getClassType(classIndex);
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constants[i] = Reference.getReference
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(clName, getUTF8(indices1[nameTypeIndex]), type);
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}
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return (Reference) constants[i];
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}
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public Object getConstant(int i) throws ClassFormatException {
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if (i == 0)
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throw new ClassFormatException("null constant");
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switch (tags[i]) {
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case ConstantPool.INTEGER:
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case ConstantPool.FLOAT:
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case ConstantPool.LONG:
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case ConstantPool.DOUBLE:
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return constants[i];
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case ConstantPool.STRING:
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return getUTF8(indices1[i]);
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}
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throw new ClassFormatException("Tag mismatch: "+tags[i]);
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}
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public String getClassType(int i) throws ClassFormatException {
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if (i == 0)
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return null;
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if (tags[i] != CLASS)
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throw new ClassFormatException("Tag mismatch");
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String clName = getUTF8(indices1[i]);
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if (clName.charAt(0) == '[')
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checkTypeSig(clName, false);
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else {
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checkClassName(clName);
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clName = ("L"+clName+';').intern();
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}
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return clName;
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}
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public String getClassName(int i) throws ClassFormatException {
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if (i == 0)
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return null;
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if (tags[i] != CLASS)
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throw new ClassFormatException("Tag mismatch");
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String clName = getUTF8(indices1[i]);
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checkClassName(clName);
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return clName.replace('/','.').intern();
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}
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public String toString(int i) {
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switch (tags[i]) {
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case CLASS:
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return "Class "+toString(indices1[i]);
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case STRING:
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return "String \""+toString(indices1[i])+"\"";
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case INTEGER:
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return "Int "+constants[i].toString();
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case FLOAT:
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return "Float "+constants[i].toString();
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case LONG:
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return "Long "+constants[i].toString();
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case DOUBLE:
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return "Double "+constants[i].toString();
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case UTF8:
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return constants[i].toString();
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case FIELDREF:
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return "Fieldref: "+toString(indices1[i])+"; "
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+ toString(indices2[i]);
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case METHODREF:
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return "Methodref: "+toString(indices1[i])+"; "
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+ toString(indices2[i]);
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case INTERFACEMETHODREF:
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return "Interfaceref: "+toString(indices1[i])+"; "
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+ toString(indices2[i]);
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case NAMEANDTYPE:
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return "Name "+toString(indices1[i])
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+"; Type "+toString(indices2[i]);
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default:
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return "unknown tag: "+tags[i];
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}
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}
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public int size() {
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return count;
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}
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public String toString() {
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StringBuffer result = new StringBuffer("[ null");
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for (int i=1; i< count; i++) {
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result.append(", ").append(i).append(" = ").append(toString(i));
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}
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result.append(" ]");
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return result.toString();
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}
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}
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