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- package org.aspectj.apache.bcel.classfile;
-
- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" and
- * "Apache BCEL" must not be used to endorse or promote products
- * derived from this software without prior written permission. For
- * written permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * "Apache BCEL", nor may "Apache" appear in their name, without
- * prior written permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- import java.io.ByteArrayOutputStream;
- import java.io.DataOutputStream;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.List;
-
- import org.aspectj.apache.bcel.Constants;
- import org.aspectj.apache.bcel.classfile.annotation.AnnotationGen;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeInvisAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeInvisParamAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeParamAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeVisAnnos;
- import org.aspectj.apache.bcel.classfile.annotation.RuntimeVisParamAnnos;
- import org.aspectj.apache.bcel.generic.Type;
- import org.aspectj.apache.bcel.util.ByteSequence;
-
- /**
- * Utility functions that do not really belong to any class in particular.
- *
- * @version $Id: Utility.java,v 1.14 2009/09/28 16:39:46 aclement Exp $
- * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
- *
- * modified: Andy Clement 2-mar-05 Removed unnecessary static and optimized
- */
- public abstract class Utility {
-
- /*
- * The 'WIDE' instruction is used in the byte code to allow 16-bit wide indices for local variables. This opcode precedes an
- * 'ILOAD', e.g.. The opcode immediately following takes an extra byte which is combined with the following byte to form a
- * 16-bit value.
- */
- private static boolean wide = false;
-
- /**
- * Convert bit field of flags into string such as 'static final'.
- *
- * @param access_flags Access flags
- * @return String representation of flags
- */
- public static final String accessToString(int access_flags) {
- return accessToString(access_flags, false);
- }
-
- /**
- * Convert bit field of flags into string such as 'static final'.
- *
- * Special case: Classes compiled with new compilers and with the 'ACC_SUPER' flag would be said to be "synchronized". This is
- * because SUN used the same value for the flags 'ACC_SUPER' and 'ACC_SYNCHRONIZED'.
- *
- * @param access_flags Access flags
- * @param for_class access flags are for class qualifiers ?
- * @return String representation of flags
- */
- public static final String accessToString(int access_flags, boolean for_class) {
- StringBuffer buf = new StringBuffer();
-
- int p = 0;
- for (int i = 0; p < Constants.MAX_ACC_FLAG; i++) { // Loop through known flags
- p = pow2(i);
- if ((access_flags & p) != 0) {
- // Special case: see comment at top of class...
- if (for_class && ((p == Constants.ACC_SUPER) || (p == Constants.ACC_INTERFACE))) {
- continue;
- }
- buf.append(Constants.ACCESS_NAMES[i]).append(" ");
- }
- }
- return buf.toString().trim();
- }
-
- /**
- * @return "class" or "interface", depending on the ACC_INTERFACE flag
- */
- public static final String classOrInterface(int access_flags) {
- return ((access_flags & Constants.ACC_INTERFACE) != 0) ? "interface" : "class";
- }
-
- /**
- * Disassemble a byte array of JVM byte codes starting from code line 'index' and return the disassembled string representation.
- * Decode only 'num' opcodes (including their operands), use -1 if you want to decompile everything.
- *
- * @param code byte code array
- * @param constant_pool Array of constants
- * @param index offset in `code' array <EM>(number of opcodes, not bytes!)</EM>
- * @param length number of opcodes to decompile, -1 for all
- * @param verbose be verbose, e.g. print constant pool index
- * @return String representation of byte codes
- */
- public static final String codeToString(byte[] code, ConstantPool constant_pool, int index, int length, boolean verbose) {
- StringBuffer buf = new StringBuffer(code.length * 20); // Should be sufficient
- ByteSequence stream = new ByteSequence(code);
-
- try {
- for (int i = 0; i < index; i++) {
- // Skip `index' lines of code
- codeToString(stream, constant_pool, verbose);
- }
-
- for (int i = 0; stream.available() > 0; i++) {
- if ((length < 0) || (i < length)) {
- String indices = fillup(stream.getIndex() + ":", 6, true, ' ');
- buf.append(indices + codeToString(stream, constant_pool, verbose) + '\n');
- }
- }
- } catch (IOException e) {
- System.out.println(buf.toString());
- e.printStackTrace();
- throw new ClassFormatException("Byte code error: " + e);
- }
-
- return buf.toString();
- }
-
- /**
- * Disassemble a stream of byte codes and return the string representation.
- */
- public static final String codeToString(byte[] code, ConstantPool constant_pool, int index, int length) {
- return codeToString(code, constant_pool, index, length, true);
- }
-
- public static final String codeToString(ByteSequence bytes, ConstantPool constant_pool) throws IOException {
- return codeToString(bytes, constant_pool, true);
- }
-
- /**
- * Shorten long class names, <em>java/lang/String</em> becomes <em>String</em>.
- *
- * @param str The long class name
- * @return Compacted class name
- */
- public static final String compactClassName(String str) {
- return compactClassName(str, true);
- }
-
- /**
- * Shorten long class name <em>str</em>, i.e., chop off the <em>prefix</em>, if the class name starts with this string and the
- * flag <em>chopit</em> is true. Slashes <em>/</em> are converted to dots <em>.</em>.
- *
- * @param str The long class name
- * @param prefix The prefix the get rid off
- * @param chopit Flag that determines whether chopping is executed or not
- * @return Compacted class name
- */
- public static final String compactClassName(String str, String prefix, boolean chopit) {
- str = str.replace('/', '.');
- if (chopit) {
- int len = prefix.length();
- // If string starts with 'prefix' and contains no further dots
- if (str.startsWith(prefix)) {
- String result = str.substring(len);
- if (result.indexOf('.') == -1) {
- str = result;
- }
- }
- }
- return str;
- }
-
- /**
- * Shorten long class names, <em>java/lang/String</em> becomes <em>java.lang.String</em>, e.g.. If <em>chopit</em> is
- * <em>true</em> the prefix <em>java.lang</em> is also removed.
- *
- * @param str The long class name
- * @param chopit Flag that determines whether chopping is executed or not
- * @return Compacted class name
- */
- public static final String compactClassName(String str, boolean chopit) {
- return compactClassName(str, "java.lang.", chopit);
- }
-
- 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);
- }
-
- /**
- * 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.
- */
- 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.contains("static")) ? 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) != ')') {
- ResultHolder rh = signatureToStringInternal(signature.substring(index), chopit);
- String param_type = rh.getResult();
- buf.append(param_type);
-
- if (vars != null) {
- LocalVariable l = vars.getLocalVariable(var_index);
-
- if (l != null) {
- buf.append(" " + l.getName());
- }
- } else {
- buf.append(" arg" + var_index);
- }
-
- if ("double".equals(param_type) || "long".equals(param_type)) {
- var_index += 2;
- } else {
- var_index++;
- }
-
- buf.append(", ");
- index += rh.getConsumedChars();
- }
-
- index++;
-
- // 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();
- }
-
- /**
- * 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 {
- index = str.indexOf(old);
- if (index != -1) {
- old_index = 0;
-
- // 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) {
- 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);
- }
-
- public static final String signatureToString(String signature, boolean chopit) {
- ResultHolder rh = signatureToStringInternal(signature, chopit);
- return rh.getResult();
- }
-
- /**
- * This method converts this string into a Java type declaration such as 'String[]' and throws a `ClassFormatException' when the
- * parsed type is invalid.
- */
- public static final ResultHolder signatureToStringInternal(String signature, boolean chopit) {
- int processedChars = 1; // This is the default, read just one char
- try {
- switch (signature.charAt(0)) {
- case 'B':
- return ResultHolder.BYTE;
- case 'C':
- return ResultHolder.CHAR;
- case 'D':
- return ResultHolder.DOUBLE;
- case 'F':
- return ResultHolder.FLOAT;
- case 'I':
- return ResultHolder.INT;
- case 'J':
- return ResultHolder.LONG;
- case 'L': { // Full class name
- int index = signature.indexOf(';'); // Look for closing ';'
-
- if (index < 0) {
- throw new ClassFormatException("Invalid signature: " + signature);
- }
-
- if (signature.length() > index + 1 && signature.charAt(index + 1) == '>') {
- index = index + 2;
- }
-
- int genericStart = signature.indexOf('<');
- if (genericStart != -1) {
- int genericEnd = signature.indexOf('>');
- // FIXME asc going to need a lot more work in here for generics
- ResultHolder rh = signatureToStringInternal(signature.substring(genericStart + 1, genericEnd), chopit);
- StringBuffer sb = new StringBuffer();
- sb.append(signature.substring(1, genericStart));
- sb.append("<").append(rh.getResult()).append(">");
- ResultHolder retval = new ResultHolder(compactClassName(sb.toString(), chopit), genericEnd + 1);
- return retval;
- } else {
- processedChars = index + 1; // "Lblabla;" `L' and `;' are removed
- ResultHolder retval = new ResultHolder(compactClassName(signature.substring(1, index), chopit), processedChars);
- return retval;
- }
- }
-
- case 'S':
- return ResultHolder.SHORT;
- case 'Z':
- return ResultHolder.BOOLEAN;
-
- case '[': { // Array declaration
- StringBuffer brackets;
- int consumedChars, n;
-
- brackets = new StringBuffer(); // Accumulate []'s
- // Count opening brackets and look for optional size argument
- for (n = 0; signature.charAt(n) == '['; n++) {
- brackets.append("[]");
- }
- consumedChars = n;
- ResultHolder restOfIt = signatureToStringInternal(signature.substring(n), chopit);
- consumedChars += restOfIt.getConsumedChars();
- brackets.insert(0, restOfIt.getResult());
- return new ResultHolder(brackets.toString(), consumedChars);
- }
- case 'V':
- return ResultHolder.VOID;
-
- default:
- throw new ClassFormatException("Invalid signature: `" + signature + "'");
- }
- } catch (StringIndexOutOfBoundsException e) { // Should never occur
- throw new ClassFormatException("Invalid signature: " + e + ":" + signature);
- }
- }
-
- /**
- * 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);
- }
- }
-
- /**
- * 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);
-
- // Just one digit, so prepend 0
- 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);
- } else {
- return new String(buf) + str;
- }
- }
-
- /**
- * 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 (char c : ch) {
- switch (c) {
- 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(c);
- break;
- }
- }
-
- return buf.toString();
- }
-
- /**
- * Converts a list of AnnotationGen objects into a set of attributes that can be attached to the class file.
- *
- * @param cp The constant pool gen where we can create the necessary name refs
- * @param annotations A list of AnnotationGen objects
- */
- public static Collection<RuntimeAnnos> getAnnotationAttributes(ConstantPool cp, List<AnnotationGen> annotations) {
-
- if (annotations.size() == 0) {
- return null;
- }
-
- try {
- int countVisible = 0;
- int countInvisible = 0;
-
- // put the annotations in the right output stream
- for (AnnotationGen a : annotations) {
- if (a.isRuntimeVisible()) {
- countVisible++;
- } else {
- countInvisible++;
- }
- }
-
- ByteArrayOutputStream rvaBytes = new ByteArrayOutputStream();
- ByteArrayOutputStream riaBytes = new ByteArrayOutputStream();
- DataOutputStream rvaDos = new DataOutputStream(rvaBytes);
- DataOutputStream riaDos = new DataOutputStream(riaBytes);
-
- rvaDos.writeShort(countVisible);
- riaDos.writeShort(countInvisible);
-
- // put the annotations in the right output stream
- for (AnnotationGen a : annotations) {
- if (a.isRuntimeVisible()) {
- a.dump(rvaDos);
- } else {
- a.dump(riaDos);
- }
- }
-
- rvaDos.close();
- riaDos.close();
-
- byte[] rvaData = rvaBytes.toByteArray();
- byte[] riaData = riaBytes.toByteArray();
-
- int rvaIndex = -1;
- int riaIndex = -1;
-
- if (rvaData.length > 2) {
- rvaIndex = cp.addUtf8("RuntimeVisibleAnnotations");
- }
- if (riaData.length > 2) {
- riaIndex = cp.addUtf8("RuntimeInvisibleAnnotations");
- }
-
- List<RuntimeAnnos> newAttributes = new ArrayList<>();
- if (rvaData.length > 2) {
- newAttributes.add(new RuntimeVisAnnos(rvaIndex, rvaData.length, rvaData, cp));
- }
- if (riaData.length > 2) {
- newAttributes.add(new RuntimeInvisAnnos(riaIndex, riaData.length, riaData, cp));
- }
-
- return newAttributes;
- } catch (IOException e) {
- System.err.println("IOException whilst processing annotations");
- e.printStackTrace();
- }
- return null;
- }
-
- /**
- * Annotations against a class are stored in one of four attribute kinds: - RuntimeVisibleParameterAnnotations -
- * RuntimeInvisibleParameterAnnotations
- */
- // OPTIMIZE looks heavyweight?
- public static Attribute[] getParameterAnnotationAttributes(ConstantPool cp, List<AnnotationGen>[] vec) {
-
- int visCount[] = new int[vec.length];
- int totalVisCount = 0;
- int invisCount[] = new int[vec.length];
- int totalInvisCount = 0;
- try {
-
- for (int i = 0; i < vec.length; i++) {
- List<AnnotationGen> l = vec[i];
- if (l != null) {
- for (AnnotationGen element : l) {
- if (element.isRuntimeVisible()) {
- visCount[i]++;
- totalVisCount++;
- } else {
- invisCount[i]++;
- totalInvisCount++;
- }
- }
- }
- }
-
- // Lets do the visible ones
- ByteArrayOutputStream rvaBytes = new ByteArrayOutputStream();
- DataOutputStream rvaDos = new DataOutputStream(rvaBytes);
- rvaDos.writeByte(vec.length); // First goes number of parameters
-
- for (int i = 0; i < vec.length; i++) {
- rvaDos.writeShort(visCount[i]);
- if (visCount[i] > 0) {
- List<AnnotationGen> l = vec[i];
- for (AnnotationGen element : l) {
- if (element.isRuntimeVisible()) {
- element.dump(rvaDos);
- }
- }
- }
- }
- rvaDos.close();
-
- // Lets do the invisible ones
- ByteArrayOutputStream riaBytes = new ByteArrayOutputStream();
- DataOutputStream riaDos = new DataOutputStream(riaBytes);
- riaDos.writeByte(vec.length); // First goes number of parameters
-
- for (int i = 0; i < vec.length; i++) {
- riaDos.writeShort(invisCount[i]);
- if (invisCount[i] > 0) {
- List<AnnotationGen> l = vec[i];
- for (AnnotationGen element : l) {
- if (!element.isRuntimeVisible()) {
- element.dump(riaDos);
- }
- }
- }
- }
- riaDos.close();
-
- byte[] rvaData = rvaBytes.toByteArray();
- byte[] riaData = riaBytes.toByteArray();
-
- int rvaIndex = -1;
- int riaIndex = -1;
-
- if (totalVisCount > 0) {
- rvaIndex = cp.addUtf8("RuntimeVisibleParameterAnnotations");
- }
- if (totalInvisCount > 0) {
- riaIndex = cp.addUtf8("RuntimeInvisibleParameterAnnotations");
- }
-
- List<RuntimeParamAnnos> newAttributes = new ArrayList<>();
-
- if (totalVisCount > 0) {
- newAttributes.add(new RuntimeVisParamAnnos(rvaIndex, rvaData.length, rvaData, cp));
- }
-
- if (totalInvisCount > 0) {
- newAttributes.add(new RuntimeInvisParamAnnos(riaIndex, riaData.length, riaData, cp));
- }
-
- return newAttributes.toArray(new Attribute[] {});
- } catch (IOException e) {
- System.err.println("IOException whilst processing parameter annotations");
- e.printStackTrace();
- }
- return null;
- }
-
- public static class ResultHolder {
- private String result;
- private int consumed;
-
- public static final ResultHolder BYTE = new ResultHolder("byte", 1);
- public static final ResultHolder CHAR = new ResultHolder("char", 1);
- public static final ResultHolder DOUBLE = new ResultHolder("double", 1);
- public static final ResultHolder FLOAT = new ResultHolder("float", 1);
- public static final ResultHolder INT = new ResultHolder("int", 1);
- public static final ResultHolder LONG = new ResultHolder("long", 1);
- public static final ResultHolder SHORT = new ResultHolder("short", 1);
- public static final ResultHolder BOOLEAN = new ResultHolder("boolean", 1);
- public static final ResultHolder VOID = new ResultHolder("void", 1);
-
- public ResultHolder(String s, int c) {
- result = s;
- consumed = c;
- }
-
- public String getResult() {
- return result;
- }
-
- public int getConsumedChars() {
- return consumed;
- }
- }
-
- /**
- * 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);
- }
- }
-
- public static final byte typeOfSignature(char c) throws ClassFormatException {
- switch (c) {
- 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 type of signature: " + c);
- }
- }
-
- /**
- * Disassemble a stream of byte codes and return the string representation.
- *
- * @param bytes stream of bytes
- * @param constant_pool Array of constants
- * @param verbose be verbose, e.g. print constant pool index
- * @return String representation of byte code
- */
- public static final String codeToString(ByteSequence bytes, ConstantPool constant_pool, boolean verbose) throws IOException {
- short opcode = (short) bytes.readUnsignedByte();
- int default_offset = 0, low, high, npairs;
- int index, vindex, constant;
- int[] match, jump_table;
- int no_pad_bytes = 0, offset;
- StringBuffer buf = new StringBuffer(Constants.OPCODE_NAMES[opcode]);
-
- /*
- * Special case: Skip (0-3) padding bytes, i.e., the following bytes are 4-byte-aligned
- */
- if ((opcode == Constants.TABLESWITCH) || (opcode == Constants.LOOKUPSWITCH)) {
- int remainder = bytes.getIndex() % 4;
- no_pad_bytes = (remainder == 0) ? 0 : 4 - remainder;
-
- for (int i = 0; i < no_pad_bytes; i++) {
- byte b = bytes.readByte();
- if (b != 0) {
- System.err.println("Warning: Padding byte != 0 in " + Constants.OPCODE_NAMES[opcode] + ":" + b);
- }
- }
-
- // Both cases have a field default_offset in common
- default_offset = bytes.readInt();
- }
-
- switch (opcode) {
- /*
- * Table switch has variable length arguments.
- */
- case Constants.TABLESWITCH:
- low = bytes.readInt();
- high = bytes.readInt();
-
- offset = bytes.getIndex() - 12 - no_pad_bytes - 1;
- default_offset += offset;
-
- buf.append("\tdefault = " + default_offset + ", low = " + low + ", high = " + high + "(");
-
- jump_table = new int[high - low + 1];
- for (int i = 0; i < jump_table.length; i++) {
- jump_table[i] = offset + bytes.readInt();
- buf.append(jump_table[i]);
- if (i < jump_table.length - 1) {
- buf.append(", ");
- }
- }
- buf.append(")");
- break;
-
- /*
- * Lookup switch has variable length arguments.
- */
- case Constants.LOOKUPSWITCH: {
-
- npairs = bytes.readInt();
- offset = bytes.getIndex() - 8 - no_pad_bytes - 1;
-
- match = new int[npairs];
- jump_table = new int[npairs];
- default_offset += offset;
-
- buf.append("\tdefault = " + default_offset + ", npairs = " + npairs + " (");
-
- for (int i = 0; i < npairs; i++) {
- match[i] = bytes.readInt();
- jump_table[i] = offset + bytes.readInt();
- buf.append("(" + match[i] + ", " + jump_table[i] + ")");
- if (i < npairs - 1) {
- buf.append(", ");
- }
- }
- buf.append(")");
- }
- break;
-
- // Two address bytes + offset from start of byte stream form the jump target
- case Constants.GOTO:
- case Constants.IFEQ:
- case Constants.IFGE:
- case Constants.IFGT:
- case Constants.IFLE:
- case Constants.IFLT:
- case Constants.JSR:
- case Constants.IFNE:
- case Constants.IFNONNULL:
- case Constants.IFNULL:
- case Constants.IF_ACMPEQ:
- case Constants.IF_ACMPNE:
- case Constants.IF_ICMPEQ:
- case Constants.IF_ICMPGE:
- case Constants.IF_ICMPGT:
- case Constants.IF_ICMPLE:
- case Constants.IF_ICMPLT:
- case Constants.IF_ICMPNE:
- buf.append("\t\t#" + ((bytes.getIndex() - 1) + bytes.readShort()));
- break;
-
- // 32-bit wide jumps
- case Constants.GOTO_W:
- case Constants.JSR_W:
- buf.append("\t\t#" + ((bytes.getIndex() - 1) + bytes.readInt()));
- break;
-
- // Index byte references local variable (register)
- case Constants.ALOAD:
- case Constants.ASTORE:
- case Constants.DLOAD:
- case Constants.DSTORE:
- case Constants.FLOAD:
- case Constants.FSTORE:
- case Constants.ILOAD:
- case Constants.ISTORE:
- case Constants.LLOAD:
- case Constants.LSTORE:
- case Constants.RET:
- if (wide) {
- vindex = bytes.readUnsignedShort();
- wide = false; // Clear flag
- } else {
- vindex = bytes.readUnsignedByte();
- }
- buf.append("\t\t%" + vindex);
- break;
-
- /*
- * Remember wide byte which is used to form a 16-bit address in the following instruction. Relies on that the method is
- * called again with the following opcode.
- */
- case Constants.WIDE:
- wide = true;
- buf.append("\t(wide)");
- break;
-
- // Array of basic type
- case Constants.NEWARRAY:
- buf.append("\t\t<" + Constants.TYPE_NAMES[bytes.readByte()] + ">");
- break;
-
- // Access object/class fields
- case Constants.GETFIELD:
- case Constants.GETSTATIC:
- case Constants.PUTFIELD:
- case Constants.PUTSTATIC:
- index = bytes.readUnsignedShort();
- buf.append("\t\t" + constant_pool.constantToString(index, Constants.CONSTANT_Fieldref)
- + (verbose ? " (" + index + ")" : ""));
- break;
-
- // Operands are references to classes in constant pool
- case Constants.NEW:
- case Constants.CHECKCAST:
- buf.append("\t");
- case Constants.INSTANCEOF:
- index = bytes.readUnsignedShort();
- buf.append("\t<" + constant_pool.constantToString(index) + ">" + (verbose ? " (" + index + ")" : ""));
- break;
-
- // Operands are references to methods in constant pool
- case Constants.INVOKESPECIAL:
- case Constants.INVOKESTATIC:
- case Constants.INVOKEVIRTUAL:
- index = bytes.readUnsignedShort();
- buf.append("\t" + constant_pool.constantToString(index) + (verbose ? " (" + index + ")" : ""));
- break;
-
- case Constants.INVOKEINTERFACE:
- index = bytes.readUnsignedShort();
- int nargs = bytes.readUnsignedByte(); // historical, redundant
- buf.append("\t" + constant_pool.constantToString(index) + (verbose ? " (" + index + ")\t" : "") + nargs + "\t"
- + bytes.readUnsignedByte()); // Last byte is a reserved
- // space
- break;
-
- case Constants.INVOKEDYNAMIC://http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-6.html#jvms-6.5.invokedynamic
- index = bytes.readUnsignedShort();
- bytes.readUnsignedShort(); // zeroes
- buf.append("\t" + constant_pool.constantToString(index) + (verbose ? " (" + index + ")" : ""));
- break;
-
- // Operands are references to items in constant pool
- case Constants.LDC_W:
- case Constants.LDC2_W:
- index = bytes.readUnsignedShort();
- buf.append("\t\t" + constant_pool.constantToString(index) + (verbose ? " (" + index + ")" : ""));
- break;
-
- case Constants.LDC:
- index = bytes.readUnsignedByte();
- buf.append("\t\t" + constant_pool.constantToString(index) + (verbose ? " (" + index + ")" : ""));
- break;
-
- // Array of references
- case Constants.ANEWARRAY:
- index = bytes.readUnsignedShort();
- buf.append("\t\t<" + compactClassName(constant_pool.getConstantString(index, Constants.CONSTANT_Class), false) + ">"
- + (verbose ? " (" + index + ")" : ""));
- break;
-
- // Multidimensional array of references
- case Constants.MULTIANEWARRAY: {
- index = bytes.readUnsignedShort();
- int dimensions = bytes.readUnsignedByte();
-
- buf.append("\t<" + compactClassName(constant_pool.getConstantString(index, Constants.CONSTANT_Class), false) + ">\t"
- + dimensions + (verbose ? " (" + index + ")" : ""));
- }
- break;
-
- // Increment local variable
- case Constants.IINC:
- if (wide) {
- vindex = bytes.readUnsignedShort();
- constant = bytes.readShort();
- wide = false;
- } else {
- vindex = bytes.readUnsignedByte();
- constant = bytes.readByte();
- }
- buf.append("\t\t%" + vindex + "\t" + constant);
- break;
-
- default:
- if ((Constants.iLen[opcode] - 1) > 0) {
- for (int i = 0; i < Constants.TYPE_OF_OPERANDS[opcode].length; i++) {
- buf.append("\t\t");
- switch (Constants.TYPE_OF_OPERANDS[opcode][i]) {
- case Constants.T_BYTE:
- buf.append(bytes.readByte());
- break;
- case Constants.T_SHORT:
- buf.append(bytes.readShort());
- break;
- case Constants.T_INT:
- buf.append(bytes.readInt());
- break;
-
- default: // Never reached
- System.err.println("Unreachable default case reached!");
- System.exit(-1);
- }
- }
- }
- }
- return buf.toString();
- }
-
- // private helpers
- private static final int pow2(int n) {
- return 1 << n;
- }
-
- /**
- * Convert type to Java method signature, e.g. int[] f(java.lang.String x) becomes (Ljava/lang/String;)[I
- *
- * @param returnType what the method returns
- * @param argTypes what are the argument types
- * @return method signature for given type(s).
- */
- public static String toMethodSignature(Type returnType, Type[] argTypes) {
- StringBuffer buf = new StringBuffer("(");
- int length = (argTypes == null) ? 0 : argTypes.length;
- for (int i = 0; i < length; i++) {
- buf.append(argTypes[i].getSignature());
- }
- buf.append(')');
- buf.append(returnType.getSignature());
- return buf.toString();
- }
- }
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