1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2002 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 */
54 package net.sf.cglib;
55
56 import java.lang.reflect.*;
57 import java.util.*;
58 import net.sf.cglib.core.*;
59 import org.objectweb.asm.Label;
60 import org.objectweb.asm.Type;
61
62 class MethodInterceptorGenerator
63 implements CallbackGenerator
64 {
65 public static final MethodInterceptorGenerator INSTANCE = new MethodInterceptorGenerator();
66
67 private static final Type ABSTRACT_METHOD_ERROR =
68 TypeUtils.parseType("AbstractMethodError");
69 private static final Type METHOD =
70 TypeUtils.parseType("java.lang.reflect.Method");
71 private static final Type METHOD_PROXY =
72 TypeUtils.parseType("net.sf.cglib.MethodProxy");
73 private static final Type METHOD_INTERCEPTOR =
74 TypeUtils.parseType("net.sf.cglib.MethodInterceptor");
75 private static final Signature GET_DECLARING_CLASS =
76 TypeUtils.parseSignature("Class getDeclaringClass()");
77 private static final Signature GET_CLASS_LOADER =
78 TypeUtils.parseSignature("ClassLoader getClassLoader()");
79 private static final Signature MAKE_PROXY =
80 TypeUtils.parseSignature("net.sf.cglib.MethodProxy create(ClassLoader ,Class, String, Class, String)");
81 private static final Signature INTERCEPT =
82 TypeUtils.parseSignature("Object intercept(Object, java.lang.reflect.Method, Object[], net.sf.cglib.MethodProxy)");
83
84 public void generate(ClassEmitter ce, Context context) {
85 for (Iterator it = context.getMethods(); it.hasNext();) {
86 Method method = (Method)it.next();
87 String accessName = getAccessName(context, method);
88 String fieldName = getFieldName(context, method);
89
90 ce.declare_field(Constants.PRIVATE_FINAL_STATIC, fieldName, METHOD, null);
91 ce.declare_field(Constants.PRIVATE_FINAL_STATIC, accessName, METHOD_PROXY, null);
92 CodeEmitter e;
93
94 // access method
95 e = ce.begin_method(Constants.ACC_FINAL,
96 new Signature(getAccessName(context, method),
97 ReflectUtils.getSignature(method).getDescriptor()),
98 ReflectUtils.getExceptionTypes(method));
99 if (Modifier.isAbstract(method.getModifiers())) {
100 e.throw_exception(ABSTRACT_METHOD_ERROR, method.toString() + " is abstract" );
101 } else {
102 e.load_this();
103 e.load_args();
104 e.super_invoke(ReflectUtils.getSignature(method));
105 }
106 e.return_value();
107 e.end_method();
108
109 // around method
110 e = ce.begin_method(context.getModifiers(method),
111 ReflectUtils.getSignature(method),
112 ReflectUtils.getExceptionTypes(method));
113 Label nullInterceptor = e.make_label();
114 context.emitCallback(e);
115 e.dup();
116 e.ifnull(nullInterceptor);
117
118 e.load_this();
119 e.getfield(fieldName);
120 e.create_arg_array();
121 e.getfield(accessName);
122 e.invoke_interface(METHOD_INTERCEPTOR, INTERCEPT);
123 e.unbox_or_zero(Type.getType(method.getReturnType()));
124 e.return_value();
125
126 e.mark(nullInterceptor);
127 e.load_this();
128 e.load_args();
129 e.super_invoke(ReflectUtils.getSignature(method));
130 e.return_value();
131 e.end_method();
132 }
133 }
134
135 private String getFieldName(Context context, Method method) {
136 return "CGLIB$$METHOD_" + context.getUniqueName(method);
137 }
138
139 private String getAccessName(Context context, Method method) {
140 return "CGLIB$$ACCESS_" + context.getUniqueName(method);
141 }
142
143 public void generateStatic(CodeEmitter e, final Context context) {
144 /* generates:
145 static {
146 Class cls = findClass("java.lang.Object");
147 METHOD_1 = cls.getDeclaredMethod("toString", new Class[0]);
148
149 Class thisClass = findClass("NameOfThisClass");
150 CGLIB$ACCESS_0 = MethodProxy.create(thisClass.getClassLoader(),
151 cls, "toString()Ljava.lang.String;",
152 thisClass, "CGLIB$ACCESS_0()Ljava.lang.String;");
153 }
154 */
155
156 Local thisclass = e.make_local();
157 ComplexOps.load_class_this(e);
158 e.dup();
159 e.store_local(thisclass);
160 e.invoke_virtual(Constants.TYPE_CLASS, GET_CLASS_LOADER);
161
162 for (Iterator it = context.getMethods(); it.hasNext();) {
163 e.dup();
164 Method method = (Method)it.next();
165 ComplexOps.load_method(e, method);
166 e.dup();
167 e.putfield(getFieldName(context, method));
168
169 String accessName = getAccessName(context, method);
170 Signature sig = ReflectUtils.getSignature(method);
171 e.invoke_virtual(METHOD, GET_DECLARING_CLASS);
172 e.push(method.getName() + sig.getDescriptor());
173
174 e.load_local(thisclass);
175 e.push(accessName + sig.getDescriptor());
176 e.invoke_static(METHOD_PROXY, MAKE_PROXY);
177 e.putfield(accessName);
178 }
179 }
180 }
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