1343 lines
48 KiB
Java
1343 lines
48 KiB
Java
/*
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* Copyright 2000-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package org.apache.bcel.classfile;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.CharArrayReader;
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import java.io.CharArrayWriter;
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import java.io.FilterReader;
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import java.io.FilterWriter;
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import java.io.IOException;
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import java.io.PrintStream;
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import java.io.PrintWriter;
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import java.io.Reader;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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import org.apache.bcel.Constants;
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import org.apache.bcel.util.ByteSequence;
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/**
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* Utility functions that do not really belong to any class in particular.
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*
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* @version $Id: Utility.java 386056 2006-03-15 11:31:56Z tcurdt $
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* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
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*/
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public abstract class Utility {
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private static int unwrap( ThreadLocal tl ) {
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return ((Integer) tl.get()).intValue();
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}
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private static void wrap( ThreadLocal tl, int value ) {
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tl.set(new Integer(value));
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}
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private static ThreadLocal consumed_chars = new ThreadLocal() {
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protected Object initialValue() {
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return new Integer(0);
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}
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};/* How many chars have been consumed
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* during parsing in signatureToString().
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* Read by methodSignatureToString().
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* Set by side effect,but only internally.
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*/
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private static boolean wide = false; /* The `WIDE' instruction is used in the
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* byte code to allow 16-bit wide indices
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* for local variables. This opcode
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* precedes an `ILOAD', e.g.. The opcode
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* immediately following takes an extra
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* byte which is combined with the
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* following byte to form a
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* 16-bit value.
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*/
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/**
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* Convert bit field of flags into string such as `static final'.
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*
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* @param access_flags Access flags
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* @return String representation of flags
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*/
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public static final String accessToString( int access_flags ) {
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return accessToString(access_flags, false);
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}
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/**
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* Convert bit field of flags into string such as `static final'.
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*
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* Special case: Classes compiled with new compilers and with the
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* `ACC_SUPER' flag would be said to be "synchronized". This is
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* because SUN used the same value for the flags `ACC_SUPER' and
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* `ACC_SYNCHRONIZED'.
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*
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* @param access_flags Access flags
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* @param for_class access flags are for class qualifiers ?
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* @return String representation of flags
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*/
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public static final String accessToString( int access_flags, boolean for_class ) {
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StringBuffer buf = new StringBuffer();
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int p = 0;
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for (int i = 0; p < Constants.MAX_ACC_FLAG; i++) { // Loop through known flags
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p = pow2(i);
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if ((access_flags & p) != 0) {
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/* Special case: Classes compiled with new compilers and with the
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* `ACC_SUPER' flag would be said to be "synchronized". This is
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* because SUN used the same value for the flags `ACC_SUPER' and
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* `ACC_SYNCHRONIZED'.
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*/
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if (for_class && ((p == Constants.ACC_SUPER) || (p == Constants.ACC_INTERFACE))) {
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continue;
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}
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buf.append(Constants.ACCESS_NAMES[i]).append(" ");
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}
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}
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return buf.toString().trim();
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}
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/**
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* @return "class" or "interface", depending on the ACC_INTERFACE flag
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*/
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public static final String classOrInterface( int access_flags ) {
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return ((access_flags & Constants.ACC_INTERFACE) != 0) ? "interface" : "class";
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}
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/**
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* Disassemble a byte array of JVM byte codes starting from code line
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* `index' and return the disassembled string representation. Decode only
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* `num' opcodes (including their operands), use -1 if you want to
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* decompile everything.
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*
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* @param code byte code array
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* @param constant_pool Array of constants
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* @param index offset in `code' array
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* <EM>(number of opcodes, not bytes!)</EM>
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* @param length number of opcodes to decompile, -1 for all
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* @param verbose be verbose, e.g. print constant pool index
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* @return String representation of byte codes
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*/
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public static final String codeToString( byte[] code, ConstantPool constant_pool, int index,
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int length, boolean verbose ) {
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StringBuffer buf = new StringBuffer(code.length * 20); // Should be sufficient
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ByteSequence stream = new ByteSequence(code);
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try {
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for (int i = 0; i < index; i++) {
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codeToString(stream, constant_pool, verbose);
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}
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for (int i = 0; stream.available() > 0; i++) {
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if ((length < 0) || (i < length)) {
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String indices = fillup(stream.getIndex() + ":", 6, true, ' ');
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buf.append(indices).append(codeToString(stream, constant_pool, verbose))
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.append('\n');
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}
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}
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} catch (IOException e) {
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System.out.println(buf.toString());
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e.printStackTrace();
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throw new ClassFormatException("Byte code error: " + e);
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}
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return buf.toString();
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}
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public static final String codeToString( byte[] code, ConstantPool constant_pool, int index,
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int length ) {
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return codeToString(code, constant_pool, index, length, true);
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}
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/**
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* Disassemble a stream of byte codes and return the
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* string representation.
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*
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* @param bytes stream of bytes
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* @param constant_pool Array of constants
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* @param verbose be verbose, e.g. print constant pool index
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* @return String representation of byte code
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*/
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public static final String codeToString( ByteSequence bytes, ConstantPool constant_pool,
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boolean verbose ) throws IOException {
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short opcode = (short) bytes.readUnsignedByte();
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int default_offset = 0, low, high, npairs;
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int index, vindex, constant;
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int[] match, jump_table;
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int no_pad_bytes = 0, offset;
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StringBuffer buf = new StringBuffer(Constants.OPCODE_NAMES[opcode]);
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/* Special case: Skip (0-3) padding bytes, i.e., the
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* following bytes are 4-byte-aligned
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*/
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if ((opcode == Constants.TABLESWITCH) || (opcode == Constants.LOOKUPSWITCH)) {
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int remainder = bytes.getIndex() % 4;
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no_pad_bytes = (remainder == 0) ? 0 : 4 - remainder;
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for (int i = 0; i < no_pad_bytes; i++) {
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byte b;
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if ((b = bytes.readByte()) != 0) {
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System.err.println("Warning: Padding byte != 0 in "
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+ Constants.OPCODE_NAMES[opcode] + ":" + b);
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}
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}
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// Both cases have a field default_offset in common
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default_offset = bytes.readInt();
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}
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switch (opcode) {
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/* Table switch has variable length arguments.
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*/
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case Constants.TABLESWITCH:
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low = bytes.readInt();
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high = bytes.readInt();
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offset = bytes.getIndex() - 12 - no_pad_bytes - 1;
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default_offset += offset;
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buf.append("\tdefault = ").append(default_offset).append(", low = ").append(low)
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.append(", high = ").append(high).append("(");
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jump_table = new int[high - low + 1];
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for (int i = 0; i < jump_table.length; i++) {
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jump_table[i] = offset + bytes.readInt();
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buf.append(jump_table[i]);
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if (i < jump_table.length - 1) {
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buf.append(", ");
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}
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}
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buf.append(")");
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break;
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/* Lookup switch has variable length arguments.
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*/
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case Constants.LOOKUPSWITCH: {
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npairs = bytes.readInt();
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offset = bytes.getIndex() - 8 - no_pad_bytes - 1;
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match = new int[npairs];
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jump_table = new int[npairs];
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default_offset += offset;
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buf.append("\tdefault = ").append(default_offset).append(", npairs = ").append(
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npairs).append(" (");
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for (int i = 0; i < npairs; i++) {
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match[i] = bytes.readInt();
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jump_table[i] = offset + bytes.readInt();
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buf.append("(").append(match[i]).append(", ").append(jump_table[i]).append(")");
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if (i < npairs - 1) {
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buf.append(", ");
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}
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}
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buf.append(")");
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}
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break;
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/* Two address bytes + offset from start of byte stream form the
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* jump target
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*/
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case Constants.GOTO:
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case Constants.IFEQ:
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case Constants.IFGE:
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case Constants.IFGT:
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case Constants.IFLE:
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case Constants.IFLT:
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case Constants.JSR:
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case Constants.IFNE:
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case Constants.IFNONNULL:
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case Constants.IFNULL:
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case Constants.IF_ACMPEQ:
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case Constants.IF_ACMPNE:
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case Constants.IF_ICMPEQ:
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case Constants.IF_ICMPGE:
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case Constants.IF_ICMPGT:
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case Constants.IF_ICMPLE:
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case Constants.IF_ICMPLT:
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case Constants.IF_ICMPNE:
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buf.append("\t\t#").append((bytes.getIndex() - 1) + bytes.readShort());
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break;
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/* 32-bit wide jumps
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*/
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case Constants.GOTO_W:
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case Constants.JSR_W:
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buf.append("\t\t#").append(((bytes.getIndex() - 1) + bytes.readInt()));
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break;
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/* Index byte references local variable (register)
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*/
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case Constants.ALOAD:
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case Constants.ASTORE:
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case Constants.DLOAD:
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case Constants.DSTORE:
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case Constants.FLOAD:
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case Constants.FSTORE:
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case Constants.ILOAD:
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case Constants.ISTORE:
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case Constants.LLOAD:
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case Constants.LSTORE:
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case Constants.RET:
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if (wide) {
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vindex = bytes.readUnsignedShort();
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wide = false; // Clear flag
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} else {
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vindex = bytes.readUnsignedByte();
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}
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buf.append("\t\t%").append(vindex);
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break;
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/*
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* Remember wide byte which is used to form a 16-bit address in the
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* following instruction. Relies on that the method is called again with
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* the following opcode.
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*/
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case Constants.WIDE:
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wide = true;
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buf.append("\t(wide)");
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break;
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/* Array of basic type.
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*/
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case Constants.NEWARRAY:
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buf.append("\t\t<").append(Constants.TYPE_NAMES[bytes.readByte()]).append(">");
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break;
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/* Access object/class fields.
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*/
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case Constants.GETFIELD:
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case Constants.GETSTATIC:
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case Constants.PUTFIELD:
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case Constants.PUTSTATIC:
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index = bytes.readUnsignedShort();
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buf.append("\t\t").append(
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constant_pool.constantToString(index, Constants.CONSTANT_Fieldref)).append(
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(verbose ? " (" + index + ")" : ""));
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break;
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/* Operands are references to classes in constant pool
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*/
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case Constants.NEW:
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case Constants.CHECKCAST:
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buf.append("\t");
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case Constants.INSTANCEOF:
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index = bytes.readUnsignedShort();
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buf.append("\t<").append(
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constant_pool.constantToString(index, Constants.CONSTANT_Class))
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.append(">").append((verbose ? " (" + index + ")" : ""));
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break;
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/* Operands are references to methods in constant pool
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*/
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case Constants.INVOKESPECIAL:
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case Constants.INVOKESTATIC:
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case Constants.INVOKEVIRTUAL:
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index = bytes.readUnsignedShort();
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buf.append("\t").append(
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constant_pool.constantToString(index, Constants.CONSTANT_Methodref))
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.append((verbose ? " (" + index + ")" : ""));
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break;
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case Constants.INVOKEINTERFACE:
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index = bytes.readUnsignedShort();
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int nargs = bytes.readUnsignedByte(); // historical, redundant
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buf.append("\t").append(
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constant_pool
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.constantToString(index, Constants.CONSTANT_InterfaceMethodref))
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.append(verbose ? " (" + index + ")\t" : "").append(nargs).append("\t")
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.append(bytes.readUnsignedByte()); // Last byte is a reserved space
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break;
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/* Operands are references to items in constant pool
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*/
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case Constants.LDC_W:
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case Constants.LDC2_W:
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index = bytes.readUnsignedShort();
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buf.append("\t\t").append(
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constant_pool.constantToString(index, constant_pool.getConstant(index)
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.getTag())).append((verbose ? " (" + index + ")" : ""));
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break;
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case Constants.LDC:
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index = bytes.readUnsignedByte();
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buf.append("\t\t").append(
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constant_pool.constantToString(index, constant_pool.getConstant(index)
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.getTag())).append((verbose ? " (" + index + ")" : ""));
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break;
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/* Array of references.
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*/
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case Constants.ANEWARRAY:
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index = bytes.readUnsignedShort();
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buf.append("\t\t<").append(
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compactClassName(constant_pool.getConstantString(index,
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Constants.CONSTANT_Class), false)).append(">").append(
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(verbose ? " (" + index + ")" : ""));
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break;
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/* Multidimensional array of references.
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*/
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case Constants.MULTIANEWARRAY: {
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index = bytes.readUnsignedShort();
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int dimensions = bytes.readUnsignedByte();
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buf.append("\t<").append(
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compactClassName(constant_pool.getConstantString(index,
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Constants.CONSTANT_Class), false)).append(">\t").append(dimensions)
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.append((verbose ? " (" + index + ")" : ""));
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}
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break;
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/* Increment local variable.
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*/
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case Constants.IINC:
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if (wide) {
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vindex = bytes.readUnsignedShort();
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constant = bytes.readShort();
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wide = false;
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} else {
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vindex = bytes.readUnsignedByte();
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constant = bytes.readByte();
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}
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buf.append("\t\t%").append(vindex).append("\t").append(constant);
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break;
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default:
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if (Constants.NO_OF_OPERANDS[opcode] > 0) {
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for (int i = 0; i < Constants.TYPE_OF_OPERANDS[opcode].length; i++) {
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buf.append("\t\t");
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switch (Constants.TYPE_OF_OPERANDS[opcode][i]) {
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case Constants.T_BYTE:
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buf.append(bytes.readByte());
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break;
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case Constants.T_SHORT:
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buf.append(bytes.readShort());
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break;
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case Constants.T_INT:
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buf.append(bytes.readInt());
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break;
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default: // Never reached
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System.err.println("Unreachable default case reached!");
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System.exit(-1);
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}
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}
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}
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}
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return buf.toString();
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}
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public static final String codeToString( ByteSequence bytes, ConstantPool constant_pool )
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throws IOException {
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return codeToString(bytes, constant_pool, true);
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}
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/**
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* Shorten long class names, <em>java/lang/String</em> becomes
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* <em>String</em>.
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*
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* @param str The long class name
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* @return Compacted class name
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*/
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public static final String compactClassName( String str ) {
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return compactClassName(str, true);
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}
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/**
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* Shorten long class name <em>str</em>, i.e., chop off the <em>prefix</em>,
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* if the
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* class name starts with this string and the flag <em>chopit</em> is true.
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* Slashes <em>/</em> are converted to dots <em>.</em>.
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*
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* @param str The long class name
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* @param prefix The prefix the get rid off
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* @param chopit Flag that determines whether chopping is executed or not
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* @return Compacted class name
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*/
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public static final String compactClassName( String str, String prefix, boolean chopit ) {
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int len = prefix.length();
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str = str.replace('/', '.'); // Is `/' on all systems, even DOS
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if (chopit) {
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// If string starts with `prefix' and contains no further dots
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if (str.startsWith(prefix) && (str.substring(len).indexOf('.') == -1)) {
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str = str.substring(len);
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}
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}
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return str;
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}
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/**
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* Shorten long class names, <em>java/lang/String</em> becomes
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* <em>java.lang.String</em>,
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* e.g.. If <em>chopit</em> is <em>true</em> the prefix <em>java.lang</em>
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* is also removed.
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*
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* @param str The long class name
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* @param chopit Flag that determines whether chopping is executed or not
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* @return Compacted class name
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*/
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public static final String compactClassName( String str, boolean chopit ) {
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return compactClassName(str, "java.lang.", chopit);
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}
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/**
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* @return `flag' with bit `i' set to 1
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*/
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public static final int setBit( int flag, int i ) {
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return flag | pow2(i);
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}
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/**
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* @return `flag' with bit `i' set to 0
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*/
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public static final int clearBit( int flag, int i ) {
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int bit = pow2(i);
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return (flag & bit) == 0 ? flag : flag ^ bit;
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}
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/**
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* @return true, if bit `i' in `flag' is set
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*/
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public static final boolean isSet( int flag, int i ) {
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return (flag & pow2(i)) != 0;
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}
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/**
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* Converts string containing the method return and argument types
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* to a byte code method signature.
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*
|
|
* @param ret Return type of method
|
|
* @param argv Types of method arguments
|
|
* @return Byte code representation of method signature
|
|
*/
|
|
public final static String methodTypeToSignature( String ret, String[] argv )
|
|
throws ClassFormatException {
|
|
StringBuffer buf = new StringBuffer("(");
|
|
String str;
|
|
if (argv != null) {
|
|
for (int i = 0; i < argv.length; i++) {
|
|
str = getSignature(argv[i]);
|
|
if (str.endsWith("V")) {
|
|
throw new ClassFormatException("Invalid type: " + argv[i]);
|
|
}
|
|
buf.append(str);
|
|
}
|
|
}
|
|
str = getSignature(ret);
|
|
buf.append(")").append(str);
|
|
return buf.toString();
|
|
}
|
|
|
|
|
|
/**
|
|
* @param signature Method signature
|
|
* @return Array of argument types
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String[] methodSignatureArgumentTypes( String signature )
|
|
throws ClassFormatException {
|
|
return methodSignatureArgumentTypes(signature, true);
|
|
}
|
|
|
|
|
|
/**
|
|
* @param signature Method signature
|
|
* @param chopit Shorten class names ?
|
|
* @return Array of argument types
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String[] methodSignatureArgumentTypes( String signature, boolean chopit )
|
|
throws ClassFormatException {
|
|
List vec = new ArrayList();
|
|
int index;
|
|
try { // Read all declarations between for `(' and `)'
|
|
if (signature.charAt(0) != '(') {
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
index = 1; // current string position
|
|
while (signature.charAt(index) != ')') {
|
|
vec.add(signatureToString(signature.substring(index), chopit));
|
|
//corrected concurrent private static field acess
|
|
index += unwrap(consumed_chars); // update position
|
|
}
|
|
} catch (StringIndexOutOfBoundsException e) { // Should never occur
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
return (String[]) vec.toArray(new String[vec.size()]);
|
|
}
|
|
|
|
|
|
/**
|
|
* @param signature Method signature
|
|
* @return return type of method
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String methodSignatureReturnType( String signature )
|
|
throws ClassFormatException {
|
|
return methodSignatureReturnType(signature, true);
|
|
}
|
|
|
|
|
|
/**
|
|
* @param signature Method signature
|
|
* @param chopit Shorten class names ?
|
|
* @return return type of method
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String methodSignatureReturnType( String signature, boolean chopit )
|
|
throws ClassFormatException {
|
|
int index;
|
|
String type;
|
|
try {
|
|
// Read return type after `)'
|
|
index = signature.lastIndexOf(')') + 1;
|
|
type = signatureToString(signature.substring(index), chopit);
|
|
} catch (StringIndexOutOfBoundsException e) { // Should never occur
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
return type;
|
|
}
|
|
|
|
|
|
/**
|
|
* Converts method signature to string with all class names compacted.
|
|
*
|
|
* @param signature to convert
|
|
* @param name of method
|
|
* @param access flags of method
|
|
* @return Human readable signature
|
|
*/
|
|
public static final String methodSignatureToString( String signature, String name, String access ) {
|
|
return methodSignatureToString(signature, name, access, true);
|
|
}
|
|
|
|
|
|
public static final String methodSignatureToString( String signature, String name,
|
|
String access, boolean chopit ) {
|
|
return methodSignatureToString(signature, name, access, chopit, null);
|
|
}
|
|
|
|
|
|
/**
|
|
* A return type signature represents the return value from a method.
|
|
* It is a series of bytes in the following grammar:
|
|
*
|
|
* <return_signature> ::= <field_type> | V
|
|
*
|
|
* The character V indicates that the method returns no value. Otherwise, the
|
|
* signature indicates the type of the return value.
|
|
* An argument signature represents an argument passed to a method:
|
|
*
|
|
* <argument_signature> ::= <field_type>
|
|
*
|
|
* A method signature represents the arguments that the method expects, and
|
|
* the value that it returns.
|
|
* <method_signature> ::= (<arguments_signature>) <return_signature>
|
|
* <arguments_signature>::= <argument_signature>*
|
|
*
|
|
* This method converts such a string into a Java type declaration like
|
|
* `void main(String[])' and throws a `ClassFormatException' when the parsed
|
|
* type is invalid.
|
|
*
|
|
* @param signature Method signature
|
|
* @param name Method name
|
|
* @param access Method access rights
|
|
* @return Java type declaration
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String methodSignatureToString( String signature, String name,
|
|
String access, boolean chopit, LocalVariableTable vars ) throws ClassFormatException {
|
|
StringBuffer buf = new StringBuffer("(");
|
|
String type;
|
|
int index;
|
|
int var_index = (access.indexOf("static") >= 0) ? 0 : 1;
|
|
try { // Read all declarations between for `(' and `)'
|
|
if (signature.charAt(0) != '(') {
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
index = 1; // current string position
|
|
while (signature.charAt(index) != ')') {
|
|
String param_type = signatureToString(signature.substring(index), chopit);
|
|
buf.append(param_type);
|
|
if (vars != null) {
|
|
LocalVariable l = vars.getLocalVariable(var_index);
|
|
if (l != null) {
|
|
buf.append(" ").append(l.getName());
|
|
}
|
|
} else {
|
|
buf.append(" arg").append(var_index);
|
|
}
|
|
if ("double".equals(param_type) || "long".equals(param_type)) {
|
|
var_index += 2;
|
|
} else {
|
|
var_index++;
|
|
}
|
|
buf.append(", ");
|
|
//corrected concurrent private static field acess
|
|
index += unwrap(consumed_chars); // update position
|
|
}
|
|
index++; // update position
|
|
// Read return type after `)'
|
|
type = signatureToString(signature.substring(index), chopit);
|
|
} catch (StringIndexOutOfBoundsException e) { // Should never occur
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
if (buf.length() > 1) {
|
|
buf.setLength(buf.length() - 2);
|
|
}
|
|
buf.append(")");
|
|
return access + ((access.length() > 0) ? " " : "") + // May be an empty string
|
|
type + " " + name + buf.toString();
|
|
}
|
|
|
|
|
|
// Guess what this does
|
|
private static final int pow2( int n ) {
|
|
return 1 << n;
|
|
}
|
|
|
|
|
|
/**
|
|
* Replace all occurences of <em>old</em> in <em>str</em> with <em>new</em>.
|
|
*
|
|
* @param str String to permute
|
|
* @param old String to be replaced
|
|
* @param new_ Replacement string
|
|
* @return new String object
|
|
*/
|
|
public static final String replace( String str, String old, String new_ ) {
|
|
int index, old_index;
|
|
StringBuffer buf = new StringBuffer();
|
|
try {
|
|
if ((index = str.indexOf(old)) != -1) { // `old' found in str
|
|
old_index = 0; // String start offset
|
|
// While we have something to replace
|
|
while ((index = str.indexOf(old, old_index)) != -1) {
|
|
buf.append(str.substring(old_index, index)); // append prefix
|
|
buf.append(new_); // append replacement
|
|
old_index = index + old.length(); // Skip `old'.length chars
|
|
}
|
|
buf.append(str.substring(old_index)); // append rest of string
|
|
str = buf.toString();
|
|
}
|
|
} catch (StringIndexOutOfBoundsException e) { // Should not occur
|
|
System.err.println(e);
|
|
}
|
|
return str;
|
|
}
|
|
|
|
|
|
/**
|
|
* Converts signature to string with all class names compacted.
|
|
*
|
|
* @param signature to convert
|
|
* @return Human readable signature
|
|
*/
|
|
public static final String signatureToString( String signature ) {
|
|
return signatureToString(signature, true);
|
|
}
|
|
|
|
|
|
/**
|
|
* The field signature represents the value of an argument to a function or
|
|
* the value of a variable. It is a series of bytes generated by the
|
|
* following grammar:
|
|
*
|
|
* <PRE>
|
|
* <field_signature> ::= <field_type>
|
|
* <field_type> ::= <base_type>|<object_type>|<array_type>
|
|
* <base_type> ::= B|C|D|F|I|J|S|Z
|
|
* <object_type> ::= L<fullclassname>;
|
|
* <array_type> ::= [<field_type>
|
|
*
|
|
* The meaning of the base types is as follows:
|
|
* B byte signed byte
|
|
* C char character
|
|
* D double double precision IEEE float
|
|
* F float single precision IEEE float
|
|
* I int integer
|
|
* J long long integer
|
|
* L<fullclassname>; ... an object of the given class
|
|
* S short signed short
|
|
* Z boolean true or false
|
|
* [<field sig> ... array
|
|
* </PRE>
|
|
*
|
|
* This method converts this string into a Java type declaration such as
|
|
* `String[]' and throws a `ClassFormatException' when the parsed type is
|
|
* invalid.
|
|
*
|
|
* @param signature Class signature
|
|
* @param chopit Flag that determines whether chopping is executed or not
|
|
* @return Java type declaration
|
|
* @throws ClassFormatException
|
|
*/
|
|
public static final String signatureToString( String signature, boolean chopit ) {
|
|
//corrected concurrent private static field acess
|
|
wrap(consumed_chars, 1); // This is the default, read just one char like `B'
|
|
try {
|
|
switch (signature.charAt(0)) {
|
|
case 'B':
|
|
return "byte";
|
|
case 'C':
|
|
return "char";
|
|
case 'D':
|
|
return "double";
|
|
case 'F':
|
|
return "float";
|
|
case 'I':
|
|
return "int";
|
|
case 'J':
|
|
return "long";
|
|
case 'L': { // Full class name
|
|
int index = signature.indexOf(';'); // Look for closing `;'
|
|
if (index < 0) {
|
|
throw new ClassFormatException("Invalid signature: " + signature);
|
|
}
|
|
//corrected concurrent private static field acess
|
|
wrap(consumed_chars, index + 1); // "Lblabla;" `L' and `;' are removed
|
|
return compactClassName(signature.substring(1, index), chopit);
|
|
}
|
|
case 'S':
|
|
return "short";
|
|
case 'Z':
|
|
return "boolean";
|
|
case '[': { // Array declaration
|
|
int n;
|
|
StringBuffer brackets;
|
|
String type;
|
|
int consumed_chars; // Shadows global var
|
|
brackets = new StringBuffer(); // Accumulate []'s
|
|
// Count opening brackets and look for optional size argument
|
|
for (n = 0; signature.charAt(n) == '['; n++) {
|
|
brackets.append("[]");
|
|
}
|
|
consumed_chars = n; // Remember value
|
|
// The rest of the string denotes a `<field_type>'
|
|
type = signatureToString(signature.substring(n), chopit);
|
|
//corrected concurrent private static field acess
|
|
//Utility.consumed_chars += consumed_chars; is replaced by:
|
|
int _temp = unwrap(Utility.consumed_chars) + consumed_chars;
|
|
wrap(Utility.consumed_chars, _temp);
|
|
return type + brackets.toString();
|
|
}
|
|
case 'V':
|
|
return "void";
|
|
default:
|
|
throw new ClassFormatException("Invalid signature: `" + signature + "'");
|
|
}
|
|
} catch (StringIndexOutOfBoundsException e) { // Should never occur
|
|
throw new ClassFormatException("Invalid signature: " + e + ":" + signature);
|
|
}
|
|
}
|
|
|
|
|
|
/** Parse Java type such as "char", or "java.lang.String[]" and return the
|
|
* signature in byte code format, e.g. "C" or "[Ljava/lang/String;" respectively.
|
|
*
|
|
* @param type Java type
|
|
* @return byte code signature
|
|
*/
|
|
public static String getSignature( String type ) {
|
|
StringBuffer buf = new StringBuffer();
|
|
char[] chars = type.toCharArray();
|
|
boolean char_found = false, delim = false;
|
|
int index = -1;
|
|
loop: for (int i = 0; i < chars.length; i++) {
|
|
switch (chars[i]) {
|
|
case ' ':
|
|
case '\t':
|
|
case '\n':
|
|
case '\r':
|
|
case '\f':
|
|
if (char_found) {
|
|
delim = true;
|
|
}
|
|
break;
|
|
case '[':
|
|
if (!char_found) {
|
|
throw new RuntimeException("Illegal type: " + type);
|
|
}
|
|
index = i;
|
|
break loop;
|
|
default:
|
|
char_found = true;
|
|
if (!delim) {
|
|
buf.append(chars[i]);
|
|
}
|
|
}
|
|
}
|
|
int brackets = 0;
|
|
if (index > 0) {
|
|
brackets = countBrackets(type.substring(index));
|
|
}
|
|
type = buf.toString();
|
|
buf.setLength(0);
|
|
for (int i = 0; i < brackets; i++) {
|
|
buf.append('[');
|
|
}
|
|
boolean found = false;
|
|
for (int i = Constants.T_BOOLEAN; (i <= Constants.T_VOID) && !found; i++) {
|
|
if (Constants.TYPE_NAMES[i].equals(type)) {
|
|
found = true;
|
|
buf.append(Constants.SHORT_TYPE_NAMES[i]);
|
|
}
|
|
}
|
|
if (!found) {
|
|
buf.append('L').append(type.replace('.', '/')).append(';');
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
|
|
private static int countBrackets( String brackets ) {
|
|
char[] chars = brackets.toCharArray();
|
|
int count = 0;
|
|
boolean open = false;
|
|
for (int i = 0; i < chars.length; i++) {
|
|
switch (chars[i]) {
|
|
case '[':
|
|
if (open) {
|
|
throw new RuntimeException("Illegally nested brackets:" + brackets);
|
|
}
|
|
open = true;
|
|
break;
|
|
case ']':
|
|
if (!open) {
|
|
throw new RuntimeException("Illegally nested brackets:" + brackets);
|
|
}
|
|
open = false;
|
|
count++;
|
|
break;
|
|
default:
|
|
// Don't care
|
|
}
|
|
}
|
|
if (open) {
|
|
throw new RuntimeException("Illegally nested brackets:" + brackets);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
|
|
/**
|
|
* Return type of method signature as a byte value as defined in <em>Constants</em>
|
|
*
|
|
* @param signature in format described above
|
|
* @return type of method signature
|
|
* @see Constants
|
|
*/
|
|
public static final byte typeOfMethodSignature( String signature ) throws ClassFormatException {
|
|
int index;
|
|
try {
|
|
if (signature.charAt(0) != '(') {
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
index = signature.lastIndexOf(')') + 1;
|
|
return typeOfSignature(signature.substring(index));
|
|
} catch (StringIndexOutOfBoundsException e) {
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Return type of signature as a byte value as defined in <em>Constants</em>
|
|
*
|
|
* @param signature in format described above
|
|
* @return type of signature
|
|
* @see Constants
|
|
*/
|
|
public static final byte typeOfSignature( String signature ) throws ClassFormatException {
|
|
try {
|
|
switch (signature.charAt(0)) {
|
|
case 'B':
|
|
return Constants.T_BYTE;
|
|
case 'C':
|
|
return Constants.T_CHAR;
|
|
case 'D':
|
|
return Constants.T_DOUBLE;
|
|
case 'F':
|
|
return Constants.T_FLOAT;
|
|
case 'I':
|
|
return Constants.T_INT;
|
|
case 'J':
|
|
return Constants.T_LONG;
|
|
case 'L':
|
|
return Constants.T_REFERENCE;
|
|
case '[':
|
|
return Constants.T_ARRAY;
|
|
case 'V':
|
|
return Constants.T_VOID;
|
|
case 'Z':
|
|
return Constants.T_BOOLEAN;
|
|
case 'S':
|
|
return Constants.T_SHORT;
|
|
default:
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
} catch (StringIndexOutOfBoundsException e) {
|
|
throw new ClassFormatException("Invalid method signature: " + signature);
|
|
}
|
|
}
|
|
|
|
|
|
/** Map opcode names to opcode numbers. E.g., return Constants.ALOAD for "aload"
|
|
*/
|
|
public static short searchOpcode( String name ) {
|
|
name = name.toLowerCase(Locale.ENGLISH);
|
|
for (short i = 0; i < Constants.OPCODE_NAMES.length; i++) {
|
|
if (Constants.OPCODE_NAMES[i].equals(name)) {
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* Convert (signed) byte to (unsigned) short value, i.e., all negative
|
|
* values become positive.
|
|
*/
|
|
private static final short byteToShort( byte b ) {
|
|
return (b < 0) ? (short) (256 + b) : (short) b;
|
|
}
|
|
|
|
|
|
/** Convert bytes into hexidecimal string
|
|
*
|
|
* @return bytes as hexidecimal string, e.g. 00 FA 12 ...
|
|
*/
|
|
public static final String toHexString( byte[] bytes ) {
|
|
StringBuffer buf = new StringBuffer();
|
|
for (int i = 0; i < bytes.length; i++) {
|
|
short b = byteToShort(bytes[i]);
|
|
String hex = Integer.toString(b, 0x10);
|
|
if (b < 0x10) {
|
|
buf.append('0');
|
|
}
|
|
buf.append(hex);
|
|
if (i < bytes.length - 1) {
|
|
buf.append(' ');
|
|
}
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
|
|
/**
|
|
* Return a string for an integer justified left or right and filled up with
|
|
* `fill' characters if necessary.
|
|
*
|
|
* @param i integer to format
|
|
* @param length length of desired string
|
|
* @param left_justify format left or right
|
|
* @param fill fill character
|
|
* @return formatted int
|
|
*/
|
|
public static final String format( int i, int length, boolean left_justify, char fill ) {
|
|
return fillup(Integer.toString(i), length, left_justify, fill);
|
|
}
|
|
|
|
|
|
/**
|
|
* Fillup char with up to length characters with char `fill' and justify it left or right.
|
|
*
|
|
* @param str string to format
|
|
* @param length length of desired string
|
|
* @param left_justify format left or right
|
|
* @param fill fill character
|
|
* @return formatted string
|
|
*/
|
|
public static final String fillup( String str, int length, boolean left_justify, char fill ) {
|
|
int len = length - str.length();
|
|
char[] buf = new char[(len < 0) ? 0 : len];
|
|
for (int j = 0; j < buf.length; j++) {
|
|
buf[j] = fill;
|
|
}
|
|
if (left_justify) {
|
|
return str + new String(buf);
|
|
}
|
|
return new String(buf) + str;
|
|
}
|
|
|
|
|
|
static final boolean equals( byte[] a, byte[] b ) {
|
|
int size;
|
|
if ((size = a.length) != b.length) {
|
|
return false;
|
|
}
|
|
for (int i = 0; i < size; i++) {
|
|
if (a[i] != b[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
public static final void printArray( PrintStream out, Object[] obj ) {
|
|
out.println(printArray(obj, true));
|
|
}
|
|
|
|
|
|
public static final void printArray( PrintWriter out, Object[] obj ) {
|
|
out.println(printArray(obj, true));
|
|
}
|
|
|
|
|
|
public static final String printArray( Object[] obj ) {
|
|
return printArray(obj, true);
|
|
}
|
|
|
|
|
|
public static final String printArray( Object[] obj, boolean braces ) {
|
|
return printArray(obj, braces, false);
|
|
}
|
|
|
|
|
|
public static final String printArray( Object[] obj, boolean braces, boolean quote ) {
|
|
if (obj == null) {
|
|
return null;
|
|
}
|
|
StringBuffer buf = new StringBuffer();
|
|
if (braces) {
|
|
buf.append('{');
|
|
}
|
|
for (int i = 0; i < obj.length; i++) {
|
|
if (obj[i] != null) {
|
|
buf.append((quote ? "\"" : "")).append(obj[i].toString()).append(
|
|
(quote ? "\"" : ""));
|
|
} else {
|
|
buf.append("null");
|
|
}
|
|
if (i < obj.length - 1) {
|
|
buf.append(", ");
|
|
}
|
|
}
|
|
if (braces) {
|
|
buf.append('}');
|
|
}
|
|
return buf.toString();
|
|
}
|
|
|
|
|
|
/** @return true, if character is one of (a, ... z, A, ... Z, 0, ... 9, _)
|
|
*/
|
|
public static boolean isJavaIdentifierPart( char ch ) {
|
|
return ((ch >= 'a') && (ch <= 'z')) || ((ch >= 'A') && (ch <= 'Z'))
|
|
|| ((ch >= '0') && (ch <= '9')) || (ch == '_');
|
|
}
|
|
|
|
|
|
/** Encode byte array it into Java identifier string, i.e., a string
|
|
* that only contains the following characters: (a, ... z, A, ... Z,
|
|
* 0, ... 9, _, $). The encoding algorithm itself is not too
|
|
* clever: if the current byte's ASCII value already is a valid Java
|
|
* identifier part, leave it as it is. Otherwise it writes the
|
|
* escape character($) followed by <p><ul><li> the ASCII value as a
|
|
* hexadecimal string, if the value is not in the range
|
|
* 200..247</li> <li>a Java identifier char not used in a lowercase
|
|
* hexadecimal string, if the value is in the range
|
|
* 200..247</li><ul></p>
|
|
*
|
|
* <p>This operation inflates the original byte array by roughly 40-50%</p>
|
|
*
|
|
* @param bytes the byte array to convert
|
|
* @param compress use gzip to minimize string
|
|
*/
|
|
public static String encode( byte[] bytes, boolean compress ) throws IOException {
|
|
if (compress) {
|
|
ByteArrayOutputStream baos = new ByteArrayOutputStream();
|
|
GZIPOutputStream gos = new GZIPOutputStream(baos);
|
|
gos.write(bytes, 0, bytes.length);
|
|
gos.close();
|
|
baos.close();
|
|
bytes = baos.toByteArray();
|
|
}
|
|
CharArrayWriter caw = new CharArrayWriter();
|
|
JavaWriter jw = new JavaWriter(caw);
|
|
for (int i = 0; i < bytes.length; i++) {
|
|
int in = bytes[i] & 0x000000ff; // Normalize to unsigned
|
|
jw.write(in);
|
|
}
|
|
return caw.toString();
|
|
}
|
|
|
|
|
|
/** Decode a string back to a byte array.
|
|
*
|
|
* @param s the string to convert
|
|
* @param uncompress use gzip to uncompress the stream of bytes
|
|
*/
|
|
public static byte[] decode( String s, boolean uncompress ) throws IOException {
|
|
char[] chars = s.toCharArray();
|
|
CharArrayReader car = new CharArrayReader(chars);
|
|
JavaReader jr = new JavaReader(car);
|
|
ByteArrayOutputStream bos = new ByteArrayOutputStream();
|
|
int ch;
|
|
while ((ch = jr.read()) >= 0) {
|
|
bos.write(ch);
|
|
}
|
|
bos.close();
|
|
car.close();
|
|
jr.close();
|
|
byte[] bytes = bos.toByteArray();
|
|
if (uncompress) {
|
|
GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(bytes));
|
|
byte[] tmp = new byte[bytes.length * 3]; // Rough estimate
|
|
int count = 0;
|
|
int b;
|
|
while ((b = gis.read()) >= 0) {
|
|
tmp[count++] = (byte) b;
|
|
}
|
|
bytes = new byte[count];
|
|
System.arraycopy(tmp, 0, bytes, 0, count);
|
|
}
|
|
return bytes;
|
|
}
|
|
|
|
// A-Z, g-z, _, $
|
|
private static final int FREE_CHARS = 48;
|
|
static int[] CHAR_MAP = new int[FREE_CHARS];
|
|
static int[] MAP_CHAR = new int[256]; // Reverse map
|
|
private static final char ESCAPE_CHAR = '$';
|
|
static {
|
|
int j = 0;
|
|
for (int i = 'A'; i <= 'Z'; i++) {
|
|
CHAR_MAP[j] = i;
|
|
MAP_CHAR[i] = j;
|
|
j++;
|
|
}
|
|
for (int i = 'g'; i <= 'z'; i++) {
|
|
CHAR_MAP[j] = i;
|
|
MAP_CHAR[i] = j;
|
|
j++;
|
|
}
|
|
CHAR_MAP[j] = '$';
|
|
MAP_CHAR['$'] = j;
|
|
j++;
|
|
CHAR_MAP[j] = '_';
|
|
MAP_CHAR['_'] = j;
|
|
}
|
|
|
|
/** Decode characters into bytes.
|
|
* Used by <a href="Utility.html#decode(java.lang.String, boolean)">decode()</a>
|
|
*/
|
|
private static class JavaReader extends FilterReader {
|
|
|
|
public JavaReader(Reader in) {
|
|
super(in);
|
|
}
|
|
|
|
|
|
public int read() throws IOException {
|
|
int b = in.read();
|
|
if (b != ESCAPE_CHAR) {
|
|
return b;
|
|
}
|
|
int i = in.read();
|
|
if (i < 0) {
|
|
return -1;
|
|
}
|
|
if (((i >= '0') && (i <= '9')) || ((i >= 'a') && (i <= 'f'))) { // Normal escape
|
|
int j = in.read();
|
|
if (j < 0) {
|
|
return -1;
|
|
}
|
|
char[] tmp = {
|
|
(char) i, (char) j
|
|
};
|
|
int s = Integer.parseInt(new String(tmp), 16);
|
|
return s;
|
|
}
|
|
return MAP_CHAR[i];
|
|
}
|
|
|
|
|
|
public int read( char[] cbuf, int off, int len ) throws IOException {
|
|
for (int i = 0; i < len; i++) {
|
|
cbuf[off + i] = (char) read();
|
|
}
|
|
return len;
|
|
}
|
|
}
|
|
|
|
/** Encode bytes into valid java identifier characters.
|
|
* Used by <a href="Utility.html#encode(byte[], boolean)">encode()</a>
|
|
*/
|
|
private static class JavaWriter extends FilterWriter {
|
|
|
|
public JavaWriter(Writer out) {
|
|
super(out);
|
|
}
|
|
|
|
|
|
public void write( int b ) throws IOException {
|
|
if (isJavaIdentifierPart((char) b) && (b != ESCAPE_CHAR)) {
|
|
out.write(b);
|
|
} else {
|
|
out.write(ESCAPE_CHAR); // Escape character
|
|
// Special escape
|
|
if (b >= 0 && b < FREE_CHARS) {
|
|
out.write(CHAR_MAP[b]);
|
|
} else { // Normal escape
|
|
char[] tmp = Integer.toHexString(b).toCharArray();
|
|
if (tmp.length == 1) {
|
|
out.write('0');
|
|
out.write(tmp[0]);
|
|
} else {
|
|
out.write(tmp[0]);
|
|
out.write(tmp[1]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
public void write( char[] cbuf, int off, int len ) throws IOException {
|
|
for (int i = 0; i < len; i++) {
|
|
write(cbuf[off + i]);
|
|
}
|
|
}
|
|
|
|
|
|
public void write( String str, int off, int len ) throws IOException {
|
|
write(str.toCharArray(), off, len);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Escape all occurences of newline chars '\n', quotes \", etc.
|
|
*/
|
|
public static final String convertString( String label ) {
|
|
char[] ch = label.toCharArray();
|
|
StringBuffer buf = new StringBuffer();
|
|
for (int i = 0; i < ch.length; i++) {
|
|
switch (ch[i]) {
|
|
case '\n':
|
|
buf.append("\\n");
|
|
break;
|
|
case '\r':
|
|
buf.append("\\r");
|
|
break;
|
|
case '\"':
|
|
buf.append("\\\"");
|
|
break;
|
|
case '\'':
|
|
buf.append("\\'");
|
|
break;
|
|
case '\\':
|
|
buf.append("\\\\");
|
|
break;
|
|
default:
|
|
buf.append(ch[i]);
|
|
break;
|
|
}
|
|
}
|
|
return buf.toString();
|
|
}
|
|
}
|