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
26package sun.invoke.util;
27
28import java.lang.invoke.MethodType;
29import java.util.ArrayList;
30import java.util.List;
31
32/**
33 * Utility routines for dealing with bytecode-level signatures.
34 * @author jrose
35 */
36public 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') {
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                return (loader == null)
94                    ? Class.forName(name, false, null)
95                    : loader.loadClass(name);
96            } catch (ClassNotFoundException ex) {
97                throw new TypeNotPresentException(name, ex);
98            }
99        } else if (c == '[') {
100            Class<?> t = parseSig(str, i, end, loader);
101            if (t != null)
102                t = java.lang.reflect.Array.newInstance(t, 0).getClass();
103            return t;
104        } else {
105            return Wrapper.forBasicType(c).primitiveType();
106        }
107    }
108
109    public static String unparse(Class<?> type) {
110        StringBuilder sb = new StringBuilder();
111        unparseSig(type, sb);
112        return sb.toString();
113    }
114
115    public static String unparse(MethodType type) {
116        return unparseMethod(type.returnType(), type.parameterArray());
117    }
118
119    public static String unparse(Object type) {
120        if (type instanceof Class<?>)
121            return unparse((Class<?>) type);
122        if (type instanceof MethodType)
123            return unparse((MethodType) type);
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 {
152            boolean lsemi = (!t.isArray());
153            if (lsemi)  sb.append('L');
154            sb.append(t.getName().replace('.', '/'));
155            if (lsemi)  sb.append(';');
156        }
157    }
158
159}
160