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1
4 package com.tc.object.bytecode;
5
6 import com.tc.asm.ClassAdapter;
7 import com.tc.asm.ClassVisitor;
8 import com.tc.asm.MethodAdapter;
9 import com.tc.asm.MethodVisitor;
10 import com.tc.asm.Opcodes;
11
12 public class StringGetCharsAdapter extends ClassAdapter {
13
14 private final String  [] includePatterns;
15
16 public StringGetCharsAdapter(ClassVisitor cv, String [] includePatterns) {
17 super(cv);
18 this.includePatterns = includePatterns;
19 }
20
21 public MethodVisitor visitMethod(int access, String name, String desc, String signature, String [] exceptions) {
22 MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
23
24 for (int i = 0; i < includePatterns.length; i++) {
25 if (name.matches(includePatterns[i])) { return new RewriteStringGetChars(mv); }
26 }
27
28 return mv;
29 }
30
31 private static class RewriteStringGetChars extends MethodAdapter implements Opcodes {
32
33 public RewriteStringGetChars(MethodVisitor mv) {
34 super(mv);
35 }
36
37 public void visitMethodInsn(int opcode, String owner, String name, String desc) {
38 if ((INVOKEVIRTUAL == opcode)
39 && ("java/lang/String".equals(owner) && "getChars".equals(name) && ("(II[CI)V".equals(desc) || "([CI)V"
40 .equals(desc)))) {
41 super.visitMethodInsn(opcode, owner, "getCharsFast", desc);
42 } else {
43 super.visitMethodInsn(opcode, owner, name, desc);
44 }
45 }
46 }
47
48 }
49 |
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