01: /***
02: * ASM Guide
03: * Copyright (c) 2007 Eric Bruneton
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the copyright holders nor the names of its
15: * contributors may be used to endorse or promote products derived from
16: * this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28: * THE POSSIBILITY OF SUCH DAMAGE.
29: */package ch2.sec2;
30:
31: import static org.objectweb.asm.Opcodes.ACC_INTERFACE;
32: import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
33: import static org.objectweb.asm.Opcodes.ALOAD;
34: import static org.objectweb.asm.Opcodes.ARETURN;
35:
36: import org.objectweb.asm.ClassAdapter;
37: import org.objectweb.asm.ClassVisitor;
38: import org.objectweb.asm.MethodVisitor;
39:
40: /**
41: * ASM Guide example class.
42: *
43: * @author Eric Bruneton
44: */
45: public class AddMethodAdapter extends ClassAdapter {
46:
47: private boolean isInterface;
48:
49: private boolean isMethodPresent;
50:
51: public AddMethodAdapter(ClassVisitor cv) {
52: super (cv);
53: }
54:
55: @Override
56: public void visit(int version, int access, String name,
57: String signature, String super Name, String[] interfaces) {
58: cv.visit(version, access, name, signature, super Name,
59: interfaces);
60: isInterface = (access & ACC_INTERFACE) != 0;
61: }
62:
63: public MethodVisitor visitMethod(int access, String name,
64: String desc, String signature, String[] exceptions) {
65: if (name.equals("getThis")
66: && desc.equals("()Ljava/lang/Object;")) {
67: isMethodPresent = true;
68: }
69: return cv
70: .visitMethod(access, name, desc, signature, exceptions);
71: }
72:
73: public void visitEnd() {
74: if (!isMethodPresent && !isInterface) {
75: MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, "getThis",
76: "()Ljava/lang/Object;", null, null);
77: mv.visitCode();
78: mv.visitVarInsn(ALOAD, 0);
79: mv.visitInsn(ARETURN);
80: mv.visitMaxs(1, 1);
81: mv.visitEnd();
82: }
83: cv.visitEnd();
84: }
85: }
|