1 /*
  2  * Copyright (c) 2008, 2020, Oracle and/or its affiliates. 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.  Oracle designates this
  8  * particular file as subject to the "Classpath" exception as provided
  9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 22  * or visit www.oracle.com if you need additional information or have any
 23  * questions.
 24  */
 25 
 26 package sun.invoke.util;
 27 
 28 import java.lang.invoke.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     /**
 41      * @param loader the class loader in which to look up the types (null means
 42      *               bootstrap class loader)
 43      */
 44     public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {
 45         return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);
 46     }
 47 
 48     /**
 49      * @param loader the class loader in which to look up the types (null means
 50      *               bootstrap class loader)
 51      */
 52     static List<Class<?>> parseMethod(String bytecodeSignature,
 53             int start, int end, ClassLoader loader) {
 54         String str = bytecodeSignature;
 55         int[] i = {start};
 56         ArrayList<Class<?>> ptypes = new ArrayList<Class<?>>();
 57         if (i[0] < end && str.charAt(i[0]) == '(') {
 58             ++i[0];  // skip '('
 59             while (i[0] < end && str.charAt(i[0]) != ')') {
 60                 Class<?> pt = parseSig(str, i, end, loader);
 61                 if (pt == null || pt == void.class)
 62                     parseError(str, "bad argument type");
 63                 ptypes.add(pt);
 64             }
 65             ++i[0];  // skip ')'
 66         } else {
 67             parseError(str, "not a method type");
 68         }
 69         Class<?> rtype = parseSig(str, i, end, loader);
 70         if (rtype == null || i[0] != end)
 71             parseError(str, "bad return type");
 72         ptypes.add(rtype);
 73         return ptypes;
 74     }
 75 
 76     private static void parseError(String str, String msg) {
 77         throw new IllegalArgumentException("bad signature: "+str+": "+msg);
 78     }
 79 
 80     /**
 81      * @param loader the class loader in which to look up the types (null means
 82      *               bootstrap class loader)
 83      */
 84     private static Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {
 85         if (i[0] == end)  return null;
 86         char c = str.charAt(i[0]++);
 87         if (c == 'L' || c == 'Q') {
 88             int begc = i[0], endc = str.indexOf(';', begc);
 89             if (endc < 0)  return null;
 90             i[0] = endc+1;
 91             String name = str.substring(begc, endc).replace('/', '.');
 92             try {
 93                 Class<?> clz = Class.forName(name, false, loader);
 94                 return c == 'Q' ? clz.asValueType() : clz.asPrimaryType();
 95             } catch (ClassNotFoundException ex) {
 96                 throw new TypeNotPresentException(name, ex);
 97             }
 98         } else if (c == '[') {
 99             Class<?> t = parseSig(str, i, end, loader);
100             if (t != null)
101                 t = java.lang.reflect.Array.newInstance(t, 0).getClass();
102             return t;
103         } else {
104             return Wrapper.forBasicType(c).primitiveType();
105         }
106     }
107 
108     public static String unparse(Class<?> type) {
109         if (type == Object.class) {
110             return "Ljava/lang/Object;";
111         } else if (type == int.class) {
112             return "I";
113         }
114         return type.descriptorString();
115     }
116 
117     public static String unparse(MethodType type) {
118         return unparseMethod(type.returnType(), type.parameterArray());
119     }
120 
121     public static String unparse(Object type) {
122         if (type instanceof Class<?>)
123             return unparse((Class<?>) type);
124         if (type instanceof MethodType)
125             return unparse((MethodType) type);
126         return (String) type;
127     }
128 
129     public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {
130         StringBuilder sb = new StringBuilder();
131         sb.append('(');
132         for (Class<?> pt : ptypes)
133             unparseSig(pt, sb);
134         sb.append(')');
135         unparseSig(rtype, sb);
136         return sb.toString();
137     }
138 
139     public static String unparseMethod(Class<?> rtype, Class<?>[] ptypes) {
140         StringBuilder sb = new StringBuilder();
141         sb.append('(');
142         for (Class<?> pt : ptypes)
143             unparseSig(pt, sb);
144         sb.append(')');
145         unparseSig(rtype, sb);
146         return sb.toString();
147     }
148 
149     private static void unparseSig(Class<?> t, StringBuilder sb) {
150         char c = Wrapper.forBasicType(t).basicTypeChar();
151         if (c != 'L') {
152             sb.append(c);
153         } else if (t == Object.class) {
154             sb.append("Ljava/lang/Object;");
155         } else {
156             sb.append(t.descriptorString());
157         }
158     }
159 }
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