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Java > Open Source Codes > org > codehaus > aspectwerkz > transform > inlining > compiler > HandlerJoinPointCompiler


1 /**************************************************************************************
2  * Copyright (c) Jonas Bonér, Alexandre Vasseur. All rights reserved. *
3  * http://aspectwerkz.codehaus.org *
4  * ---------------------------------------------------------------------------------- *
5  * The software in this package is published under the terms of the LGPL license *
6  * a copy of which has been included with this distribution in the license.txt file. *
7  **************************************************************************************/

8 package org.codehaus.aspectwerkz.transform.inlining.compiler;
9
10 import org.objectweb.asm.CodeVisitor;
11 import org.objectweb.asm.Type;
12
13 /**
14  * A compiler that compiles/generates a class that represents a specific join point, a class which invokes the advices
15  * and the target join point statically.
16  * <p/>
17  * In this case, CALLEE is the catched exception instance itself.
18  *
19  * @author <a HREF="mailto:jboner@codehaus.org">Jonas Bonér </a>
20  * @author <a HREF="mailto:alex AT gnilux DOT com">Alexandre Vasseur </a>
21  */

22 public class HandlerJoinPointCompiler extends AbstractJoinPointCompiler {
23
24     /**
25      * Creates a new join point compiler instance.
26      *
27      * @param model
28      */

29     HandlerJoinPointCompiler(final CompilationInfo.Model model) {
30         super(model);
31     }
32
33     /**
34      * Creates join point specific fields.
35      */

36     protected void createJoinPointSpecificFields() {
37         // create the field argument field
38
String JavaDoc[] fieldNames = null;
39         Type fieldType = Type.getType(m_calleeClassSignature);
40         fieldNames = new String JavaDoc[1];
41         String JavaDoc fieldName = ARGUMENT_FIELD + 0;
42         fieldNames[0] = fieldName;
43         m_cw.visitField(ACC_PRIVATE, fieldName, fieldType.getDescriptor(), null, null);
44         m_fieldNames = fieldNames;
45         m_cw.visitField(
46                 ACC_PRIVATE + ACC_STATIC,
47                 SIGNATURE_FIELD_NAME,
48                 HANDLER_SIGNATURE_IMPL_CLASS_SIGNATURE,
49                 null,
50                 null
51         );
52     }
53
54     /**
55      * Creates the signature for the join point.
56      *
57      * @param cv
58      */

59     protected void createSignature(final CodeVisitor cv) {
60         cv.visitFieldInsn(GETSTATIC, m_joinPointClassName, TARGET_CLASS_FIELD_NAME, CLASS_CLASS_SIGNATURE);
61
62         cv.visitMethodInsn(
63                 INVOKESTATIC,
64                 SIGNATURE_FACTORY_CLASS,
65                 NEW_CATCH_CLAUSE_SIGNATURE_METHOD_NAME,
66                 NEW_HANDLER_SIGNATURE_METHOD_SIGNATURE
67         );
68         cv.visitFieldInsn(
69                 PUTSTATIC, m_joinPointClassName, SIGNATURE_FIELD_NAME, HANDLER_SIGNATURE_IMPL_CLASS_SIGNATURE
70         );
71
72     }
73
74     /**
75      * Optimized implementation that does not retrieve the parameters from the join point instance but is passed
76      * directly to the method from the input parameters in the 'invoke' method. Can only be used if no around advice
77      * exists.
78      *
79      * @param cv
80      * @param argStartIndex index on stack of first target method arg (0 or 1, depends of static target or not)
81      */

82     protected void createInlinedJoinPointInvocation(final CodeVisitor cv,
83                                                     final boolean isOptimizedJoinPoint,
84                                                     final int argStartIndex,
85                                                     final int joinPointIndex) {
86         // load the exception
87
cv.visitVarInsn(ALOAD, 0);//TODO if changed perhaps load CALLEE instead that host the exception ?
88
}
89
90     /**
91      * Creates a call to the target join point, the parameter(s) to the join point are retrieved from the invocation
92      * local join point instance.
93      *
94      * @param cv
95      */

96     protected void createJoinPointInvocation(final CodeVisitor cv) {
97         cv.visitInsn(ACONST_NULL);
98     }
99
100     /**
101      * Returns the join points return type.
102      *
103      * @return
104      */

105     protected Type getJoinPointReturnType() {
106         return Type.getType(m_calleeClassSignature);
107     }
108
109     /**
110      * Returns the join points argument type(s).
111      *
112      * @return
113      */

114     protected Type[] getJoinPointArgumentTypes() {
115         return new Type[]{Type.getType(m_calleeClassSignature)};//TODO should callee be arg instead ? to bind it later ?
116
}
117
118     /**
119      * Creates the getRtti method
120      */

121     protected void createGetRttiMethod() {
122         CodeVisitor cv = m_cw.visitMethod(ACC_PUBLIC, GET_RTTI_METHOD_NAME, GET_RTTI_METHOD_SIGNATURE, null, null);
123
124         // new CtorRttiImpl( .. )
125
cv.visitTypeInsn(NEW, HANDLER_RTTI_IMPL_CLASS_NAME);
126         cv.visitInsn(DUP);
127         cv.visitFieldInsn(
128                 GETSTATIC, m_joinPointClassName, SIGNATURE_FIELD_NAME, HANDLER_SIGNATURE_IMPL_CLASS_SIGNATURE
129         );
130         cv.visitVarInsn(ALOAD, 0);
131         cv.visitFieldInsn(GETFIELD, m_joinPointClassName, CALLER_INSTANCE_FIELD_NAME, m_callerClassSignature);
132         cv.visitVarInsn(ALOAD, 0);
133         cv.visitFieldInsn(GETFIELD, m_joinPointClassName, CALLEE_INSTANCE_FIELD_NAME, m_calleeClassSignature);
134         cv.visitMethodInsn(
135                 INVOKESPECIAL, HANDLER_RTTI_IMPL_CLASS_NAME, INIT_METHOD_NAME, HANDLER_RTTI_IMPL_INIT_SIGNATURE
136         );
137
138         cv.visitInsn(ARETURN);
139         cv.visitMaxs(0, 0);
140     }
141
142     /**
143      * Creates the getSignature method.
144      */

145     protected void createGetSignatureMethod() {
146         CodeVisitor cv = m_cw.visitMethod(
147                 ACC_PUBLIC,
148                 GET_SIGNATURE_METHOD_NAME,
149                 GET_SIGNATURE_METHOD_SIGNATURE,
150                 null,
151                 null
152         );
153         cv.visitFieldInsn(
154                 GETSTATIC, m_joinPointClassName,
155                 SIGNATURE_FIELD_NAME, HANDLER_SIGNATURE_IMPL_CLASS_SIGNATURE
156         );
157         cv.visitInsn(ARETURN);
158         cv.visitMaxs(0, 0);
159     }
160 }
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