1 /*
2 * Copyright (c) 2008, 2023, 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 jdk.internal.value.PrimitiveClass;
29
30 import java.lang.invoke.MethodType;
31 import java.util.ArrayList;
32 import java.util.List;
33
34 /**
35 * Utility routines for dealing with bytecode-level signatures.
36 * @author jrose
37 */
38 public class BytecodeDescriptor {
39
40 private BytecodeDescriptor() { } // cannot instantiate
41
42 /**
43 * @param loader the class loader in which to look up the types (null means
44 * bootstrap class loader)
45 */
46 public static List<Class<?>> parseMethod(String bytecodeSignature, ClassLoader loader) {
47 return parseMethod(bytecodeSignature, 0, bytecodeSignature.length(), loader);
48 }
49
50 /**
51 * @param loader the class loader in which to look up the types (null means
52 * bootstrap class loader)
53 */
54 static List<Class<?>> parseMethod(String bytecodeSignature,
55 int start, int end, ClassLoader loader) {
56 String str = bytecodeSignature;
57 int[] i = {start};
58 var ptypes = new ArrayList<Class<?>>();
59 if (i[0] < end && str.charAt(i[0]) == '(') {
60 ++i[0]; // skip '('
61 while (i[0] < end && str.charAt(i[0]) != ')') {
62 Class<?> pt = parseSig(str, i, end, loader);
63 if (pt == null || pt == void.class)
64 parseError(str, "bad argument type");
65 ptypes.add(pt);
66 }
67 ++i[0]; // skip ')'
68 } else {
69 parseError(str, "not a method type");
70 }
71 Class<?> rtype = parseSig(str, i, end, loader);
72 if (rtype == null || i[0] != end)
73 parseError(str, "bad return type");
74 ptypes.add(rtype);
75 return ptypes;
76 }
77
78 private static void parseError(String str, String msg) {
79 throw new IllegalArgumentException("bad signature: "+str+": "+msg);
80 }
81
82 /**
83 * @param loader the class loader in which to look up the types (null means
84 * bootstrap class loader)
85 */
86 private static Class<?> parseSig(String str, int[] i, int end, ClassLoader loader) {
87 if (i[0] == end) return null;
88 char c = str.charAt(i[0]++);
89 if (c == 'L' || c == 'Q') {
90 int begc = i[0], endc = str.indexOf(';', begc);
91 if (endc < 0) return null;
92 i[0] = endc+1;
93 String name = str.substring(begc, endc).replace('/', '.');
94 try {
95 Class<?> clz = Class.forName(name, false, loader);
96 return c == 'Q' ? PrimitiveClass.asValueType(clz) : PrimitiveClass.asPrimaryType(clz);
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 = t.arrayType();
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 return type.descriptorString();
117 }
118
119 public static String unparse(Object type) {
120 if (type instanceof Class<?> cl)
121 return unparse(cl);
122 if (type instanceof MethodType mt)
123 return mt.toMethodDescriptorString();
124 return (String) type;
125 }
126
127 public static String unparseMethod(Class<?> rtype, List<Class<?>> ptypes) {
128 StringBuilder sb = new StringBuilder();
129 sb.append('(');
130 for (Class<?> pt : ptypes)
131 unparseSig(pt, sb);
132 sb.append(')');
133 unparseSig(rtype, sb);
134 return sb.toString();
135 }
136
137 public static String unparseMethod(Class<?> rtype, Class<?>[] ptypes) {
138 StringBuilder sb = new StringBuilder();
139 sb.append('(');
140 for (Class<?> pt : ptypes)
141 unparseSig(pt, sb);
142 sb.append(')');
143 unparseSig(rtype, sb);
144 return sb.toString();
145 }
146
147 private static void unparseSig(Class<?> t, StringBuilder sb) {
148 char c = Wrapper.forBasicType(t).basicTypeChar();
149 if (c != 'L') {
150 sb.append(c);
151 } else if (t == Object.class) {
152 sb.append("Ljava/lang/Object;");
153 } else {
154 sb.append(t.descriptorString());
155 }
156 }
157 }