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Java > Open Source Codes > com > tc > object > bytecode > HashtableClassAdapter


1 /*
2  * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice. All rights reserved.
3  */
4 package com.tc.object.bytecode;
5
6 import com.tc.asm.Label;
7 import com.tc.asm.Opcodes;
8 import com.tc.asm.tree.MethodNode;
9
10 public class HashtableClassAdapter implements Opcodes {
11
12   public static MethodNode createMethod() {
13     MethodNode mv = new MethodNode(ACC_PROTECTED, "getEntry",
14                                               "(Ljava/lang/Object;)Ljava/util/Map$Entry;", null, null);
15     Label l0 = new Label();
16     mv.visitLabel(l0);
17     mv.visitVarInsn(ALOAD, 0);
18     mv.visitFieldInsn(GETFIELD, "java/util/Hashtable", "table", "[Ljava/util/Hashtable$Entry;");
19     mv.visitVarInsn(ASTORE, 2);
20     Label l1 = new Label();
21     mv.visitLabel(l1);
22     mv.visitVarInsn(ALOAD, 1);
23     mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I");
24     mv.visitVarInsn(ISTORE, 3);
25     Label l2 = new Label();
26     mv.visitLabel(l2);
27     mv.visitVarInsn(ILOAD, 3);
28     mv.visitLdcInsn(new Integer JavaDoc(2147483647));
29     mv.visitInsn(IAND);
30     mv.visitVarInsn(ALOAD, 2);
31     mv.visitInsn(ARRAYLENGTH);
32     mv.visitInsn(IREM);
33     mv.visitVarInsn(ISTORE, 4);
34     Label l3 = new Label();
35     mv.visitLabel(l3);
36     mv.visitVarInsn(ALOAD, 2);
37     mv.visitVarInsn(ILOAD, 4);
38     mv.visitInsn(AALOAD);
39     mv.visitVarInsn(ASTORE, 5);
40     Label l4 = new Label();
41     mv.visitLabel(l4);
42     mv.visitVarInsn(ALOAD, 5);
43     Label l5 = new Label();
44     mv.visitJumpInsn(IFNULL, l5);
45     Label l6 = new Label();
46     mv.visitLabel(l6);
47     mv.visitVarInsn(ALOAD, 5);
48     mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "hash", "I");
49     mv.visitVarInsn(ILOAD, 3);
50     Label l7 = new Label();
51     mv.visitJumpInsn(IF_ICMPNE, l7);
52     mv.visitVarInsn(ALOAD, 5);
53     mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "key", "Ljava/lang/Object;");
54     mv.visitVarInsn(ALOAD, 1);
55     mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
56     mv.visitJumpInsn(IFEQ, l7);
57     Label l8 = new Label();
58     mv.visitLabel(l8);
59     mv.visitVarInsn(ALOAD, 5);
60     mv.visitTypeInsn(CHECKCAST, "java/util/Hashtable$Entry");
61     mv.visitInsn(ARETURN);
62     mv.visitLabel(l7);
63     mv.visitVarInsn(ALOAD, 5);
64     mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "next", "Ljava/util/Hashtable$Entry;");
65     mv.visitVarInsn(ASTORE, 5);
66     mv.visitJumpInsn(GOTO, l4);
67     mv.visitLabel(l5);
68     mv.visitInsn(ACONST_NULL);
69     mv.visitInsn(ARETURN);
70     mv.visitMaxs(0, 0);
71     return mv;
72   }
73
74 }
75
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