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327 lines
9.5 KiB
327 lines
9.5 KiB
/* TypeSignature Copyright (C) 1999 Jochen Hoenicke.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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*/
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package net.sf.jode.bytecode;
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import net.sf.jode.util.UnifyHash;
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/**
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* This class contains some static methods to handle type signatures.
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*/
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public class TypeSignature {
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/**
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* This is a private method for generating the signature of a
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* given type.
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*/
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private static final StringBuffer appendSignature(StringBuffer sb,
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Class javaType) {
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if (javaType.isPrimitive()) {
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if (javaType == Boolean.TYPE)
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return sb.append('Z');
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else if (javaType == Byte.TYPE)
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return sb.append('B');
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else if (javaType == Character.TYPE)
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return sb.append('C');
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else if (javaType == Short.TYPE)
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return sb.append('S');
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else if (javaType == Integer.TYPE)
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return sb.append('I');
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else if (javaType == Long.TYPE)
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return sb.append('J');
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else if (javaType == Float.TYPE)
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return sb.append('F');
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else if (javaType == Double.TYPE)
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return sb.append('D');
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else if (javaType == Void.TYPE)
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return sb.append('V');
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else
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throw new InternalError("Unknown primitive type: "+javaType);
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} else if (javaType.isArray()) {
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return appendSignature(sb.append('['),
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javaType.getComponentType());
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} else {
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return sb.append('L')
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.append(javaType.getName().replace('.','/')).append(';');
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}
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}
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/**
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* Generate the signature for the given Class.
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* @param clazz a java.lang.Class, this may also be a primitive or
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* array type.
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* @return the type signature (see section 4.3.2 Field Descriptors
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* of the JVM specification)
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*/
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public static String getSignature(Class clazz) {
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return appendSignature(new StringBuffer(), clazz).toString();
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}
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/**
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* Generate a method signature.
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* @param paramT the java.lang.Class of the parameter types of the method.
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* @param returnT the java.lang.Class of the return type of the method.
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* @return the method signature (see section 4.3.3 Method Descriptors
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* of the JVM specification)
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*/
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public static String getSignature(Class paramT[], Class returnT) {
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StringBuffer sig = new StringBuffer("(");
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for (int i=0; i< paramT.length; i++)
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appendSignature(sig, paramT[i]);
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return appendSignature(sig.append(')'), returnT).toString();
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}
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/**
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* Generate a Class for a type signature. This is the pendant to
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* getSignature.
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* @param typeSig a single type signature
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* @return the Class object representing that type.
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*/
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public static Class getClass(String typeSig)
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throws ClassNotFoundException
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{
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switch(typeSig.charAt(0)) {
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case 'Z':
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return Boolean.TYPE;
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case 'B':
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return Byte.TYPE;
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case 'C':
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return Character.TYPE;
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case 'S':
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return Short.TYPE;
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case 'I':
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return Integer.TYPE;
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case 'F':
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return Float.TYPE;
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case 'J':
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return Long.TYPE;
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case 'D':
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return Double.TYPE;
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case 'V':
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return Void.TYPE;
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case 'L':
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typeSig = typeSig.substring(1, typeSig.length()-1)
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.replace('/','.');
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/* fall through */
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case '[':
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return Class.forName(typeSig);
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}
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throw new IllegalArgumentException(typeSig);
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}
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/**
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* Check if the given type is a two slot type. */
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private static boolean usingTwoSlots(char type) {
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return "JD".indexOf(type) >= 0;
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}
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/**
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* Returns the number of words, an object of the given simple type
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* signature takes.
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*/
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public static int getTypeSize(String typeSig) {
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return usingTwoSlots(typeSig.charAt(0)) ? 2 : 1;
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}
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public static String getElementType(String typeSig) {
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if (typeSig.charAt(0) != '[')
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throw new IllegalArgumentException();
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return typeSig.substring(1);
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}
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public static ClassInfo getClassInfo(ClassPath classpath, String typeSig) {
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if (typeSig.charAt(0) != 'L')
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throw new IllegalArgumentException();
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return classpath.getClassInfo
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(typeSig.substring(1, typeSig.length()-1).replace('/', '.'));
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}
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public static int skipType(String methodTypeSig, int position) {
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char c = methodTypeSig.charAt(position++);
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while (c == '[')
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c = methodTypeSig.charAt(position++);
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if (c == 'L')
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return methodTypeSig.indexOf(';', position) + 1;
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return position;
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}
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/**
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* Returns the number of words, the arguments for the given method
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* type signature takes.
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*/
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public static int getArgumentSize(String methodTypeSig) {
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int nargs = 0;
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int i = 1;
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for (;;) {
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char c = methodTypeSig.charAt(i);
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if (c == ')')
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return nargs;
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i = skipType(methodTypeSig, i);
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if (usingTwoSlots(c))
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nargs += 2;
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else
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nargs++;
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}
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}
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/**
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* Returns the number of words, an object of the given simple type
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* signature takes.
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*/
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public static int getReturnSize(String methodTypeSig) {
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int length = methodTypeSig.length();
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if (methodTypeSig.charAt(length - 2) == ')') {
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// This is a single character return type.
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char returnType = methodTypeSig.charAt(length - 1);
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return returnType == 'V' ? 0
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: usingTwoSlots(returnType) ? 2 : 1;
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} else
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// All multi character return types take one parameter
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return 1;
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}
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/**
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* Returns the number of words, an object of the given simple type
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* signature takes.
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*/
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public static String[] getParameterTypes(String methodTypeSig) {
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int pos = 1;
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int count = 0;
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while (methodTypeSig.charAt(pos) != ')') {
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pos = skipType(methodTypeSig, pos);
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count++;
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}
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String[] params = new String[count];
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pos = 1;
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for (int i = 0; i < count; i++) {
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int start = pos;
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pos = skipType(methodTypeSig, pos);
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params[i] = methodTypeSig.substring(start, pos);
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}
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return params;
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}
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public static Object getDefaultValue(String typeSig) {
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switch(typeSig.charAt(0)) {
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case 'Z':
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case 'B':
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case 'S':
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case 'C':
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case 'I':
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return new Integer(0);
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case 'J':
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return new Long(0L);
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case 'D':
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return new Double(0.0);
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case 'F':
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return new Float(0.0F);
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case 'L':
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case '[':
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return null;
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default:
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throw new IllegalArgumentException(typeSig);
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}
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}
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/**
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* Returns the number of words, an object of the given simple type
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* signature takes.
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*/
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public static String getReturnType(String methodTypeSig) {
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return methodTypeSig.substring(methodTypeSig.lastIndexOf(')')+1);
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}
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/**
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* Check if there is a valid class name starting at index
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* in string typesig and ending with a semicolon.
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* @return the index at which the class name ends.
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* @exception IllegalArgumentException if there was an illegal character.
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* @exception StringIndexOutOfBoundsException if the typesig ended early.
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*/
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private static int checkClassName(String clName, int i)
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throws IllegalArgumentException, StringIndexOutOfBoundsException
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{
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while (true) {
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char c = clName.charAt(i++);
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if (c == ';')
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return i;
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if (c != '/' && !Character.isJavaIdentifierPart(c))
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throw new IllegalArgumentException("Illegal java class name: "
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+ clName);
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}
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}
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/**
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* Check if there is a valid simple type signature starting at index
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* in string typesig.
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* @return the index at which the type signature ends.
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* @exception IllegalArgumentException if there was an illegal character.
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* @exception StringIndexOutOfBoundsException if the typesig ended early.
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*/
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private static int checkTypeSig(String typesig, int index) {
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char c = typesig.charAt(index++);
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while (c == '[')
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c = typesig.charAt(index++);
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if (c == 'L') {
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index = checkClassName(typesig, index);
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} else {
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if ("ZBSCIJFD".indexOf(c) == -1)
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throw new IllegalArgumentException("Type sig error: "+typesig);
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}
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return index;
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}
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public static void checkTypeSig(String typesig)
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throws IllegalArgumentException
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{
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try {
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if (checkTypeSig(typesig, 0) != typesig.length())
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throw new IllegalArgumentException
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("Type sig too long: "+typesig);
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} catch (StringIndexOutOfBoundsException ex) {
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throw new IllegalArgumentException
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("Incomplete type sig: "+typesig);
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}
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}
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public static void checkMethodTypeSig(String typesig)
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throws IllegalArgumentException
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{
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try {
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if (typesig.charAt(0) != '(')
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throw new IllegalArgumentException
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("No method signature: "+typesig);
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int i = 1;
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while (typesig.charAt(i) != ')')
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i = checkTypeSig(typesig, i);
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// skip closing parenthesis.
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i++;
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if (typesig.charAt(i) == 'V')
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// accept void return type.
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i++;
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else
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i = checkTypeSig(typesig, i);
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if (i != typesig.length())
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throw new IllegalArgumentException
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("Type sig too long: "+typesig);
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} catch (StringIndexOutOfBoundsException ex) {
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throw new IllegalArgumentException
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("Incomplete type sig: "+typesig);
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}
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}
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}
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