1 /*
2 * copyright (c) 2008, 2015, 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 = (loader == null)
94 ? Class.forName(name, false, null)
95 : loader.loadClass(name);
96 return c == 'Q' ? clz.asValueType() : clz.asBoxType();
97 } catch (ClassNotFoundException ex) {
98 throw new TypeNotPresentException(name, ex);
99 }
100 } else if (c == '[') {
101 Class<?> t = parseSig(str, i, end, loader);
102 if (t != null)
103 t = java.lang.reflect.Array.newInstance(t, 0).getClass();
104 return t;
105 } else {
106 return Wrapper.forBasicType(c).primitiveType();
107 }
108 }
109
110 public static String unparse(Class<?> type) {
111 if (type == Object.class) {
112 return "Ljava/lang/Object;";
113 } else if (type == int.class) {
114 return "I";
115 }
116 StringBuilder sb = new StringBuilder();
117 unparseSig(type, sb);
118 return sb.toString();
119 }
120
121 public static String unparse(MethodType type) {
122 return unparseMethod(type.returnType(), type.parameterArray());
123 }
124
125 public static String unparse(Object type) {
126 if (type instanceof Class<?>)
127 return unparse((Class<?>) type);
128 if (type instanceof MethodType)
129 return unparse((MethodType) type);
130 return (String) type;
131 }
132
133 public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {
134 StringBuilder sb = new StringBuilder();
135 sb.append('(');
136 for (Class<?> pt : ptypes)
137 unparseSig(pt, sb);
138 sb.append(')');
139 unparseSig(rtype, sb);
140 return sb.toString();
141 }
142
143 public static String unparseMethod(Class<?> rtype, Class<?>[] ptypes) {
144 StringBuilder sb = new StringBuilder();
145 sb.append('(');
146 for (Class<?> pt : ptypes)
147 unparseSig(pt, sb);
148 sb.append(')');
149 unparseSig(rtype, sb);
150 return sb.toString();
151 }
152
153 private static void unparseSig(Class<?> t, StringBuilder sb) {
154 char c = Wrapper.forBasicType(t).basicTypeChar();
155 if (c != 'L') {
156 sb.append(c);
157 } else if (t == Object.class) {
158 sb.append("Ljava/lang/Object;");
159 } else {
160 boolean lsemi = (!t.isArray());
161 if (t == t.asValueType())
162 c = 'Q';
163 if (lsemi) sb.append(c);
164 sb.append(t.getName().replace('.', '/'));
165 if (lsemi) sb.append(';');
166 }
167 }
168
169 }