1 /*

     2  * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.dyn.util;

    27 

    28 import java.dyn.MethodType;

    29 import java.util.ArrayList;

    30 import java.util.List;

    31 

    32 /**

    33  * Utility routines for dealing with bytecode-level signatures.

    34  * @author jrose

    35  */

    36 public class BytecodeDescriptor {

    37 

    38     private BytecodeDescriptor() { }  // cannot instantiate

    39 

    40     public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {

    41         return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);

    42     }

    43 

    44     static List<Class<?>> parseMethod(String bytecodeSignature,

    45             int start, int end, ClassLoader loader) {

    46         if (loader == null)

    47             loader = ClassLoader.getSystemClassLoader();

    48         String str = bytecodeSignature;

    49         int[] i = {start};

    50         ArrayList<Class<?>> ptypes = new ArrayList<Class<?>>();

    51         if (i[0] < end && str.charAt(i[0]) == '(') {

    52             ++i[0];  // skip '('

    53             while (i[0] < end && str.charAt(i[0]) != ')') {

    54                 Class<?> pt = parseSig(str, i, end, loader);

    55                 if (pt == null || pt == void.class)

    56                     parseError(str, "bad argument type");

    57                 ptypes.add(pt);

    58             }

    59             ++i[0];  // skip ')'

    60         } else {

    61             parseError(str, "not a method type");

    62         }

    63         Class<?> rtype = parseSig(str, i, end, loader);

    64         if (rtype == null || i[0] != end)

    65             parseError(str, "bad return type");

    66         ptypes.add(rtype);

    67         return ptypes;

    68     }

    69 

    70     static private void parseError(String str, String msg) {

    71         throw new IllegalArgumentException("bad signature: "+str+": "+msg);

    72     }

    73 

    74     static private Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {

    75         if (i[0] == end)  return null;

    76         char c = str.charAt(i[0]++);

    77         if (c == 'L') {

    78             int begc = i[0], endc = str.indexOf(';', begc);

    79             if (endc < 0)  return null;

    80             i[0] = endc+1;

    81             String name = str.substring(begc, endc).replace('/', '.');

    82             try {

    83                 return loader.loadClass(name);

    84             } catch (ClassNotFoundException ex) {

    85                 throw new TypeNotPresentException(name, ex);

    86             }

    87         } else if (c == '[') {

    88             Class<?> t = parseSig(str, i, end, loader);

    89             if (t != null)

    90                 t = java.lang.reflect.Array.newInstance(t, 0).getClass();

    91             return t;

    92         } else {

    93             return Wrapper.forBasicType(c).primitiveType();

    94         }

    95     }

    96 

    97     public static String unparse(Class<?> type) {

    98         StringBuilder sb = new StringBuilder();

    99         unparseSig(type, sb);

   100         return sb.toString();

   101     }

   102 

   103     public static String unparse(MethodType type) {

   104         return unparseMethod(type.returnType(), type.parameterList());

   105     }

   106 

   107     public static String unparse(Object type) {

   108         if (type instanceof Class<?>)

   109             return unparse((Class<?>) type);

   110         if (type instanceof MethodType)

   111             return unparse((MethodType) type);

   112         return (String) type;

   113     }

   114 

   115     public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {

   116         StringBuilder sb = new StringBuilder();

   117         sb.append('(');

   118         for (Class<?> pt : ptypes)

   119             unparseSig(pt, sb);

   120         sb.append(')');

   121         unparseSig(rtype, sb);

   122         return sb.toString();

   123     }

   124 

   125     static private void unparseSig(Class<?> t, StringBuilder sb) {

   126         char c = Wrapper.forBasicType(t).basicTypeChar();

   127         if (c != 'L') {

   128             sb.append(c);

   129         } else {

   130             boolean lsemi = (!t.isArray());

   131             if (lsemi)  sb.append('L');

   132             sb.append(t.getName().replace('.', '/'));

   133             if (lsemi)  sb.append(';');

   134         }

   135     }

   136 

   137 }