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1
4 package com.tc.object.bytecode;
5
6 import com.tc.asm.ClassVisitor;
7 import com.tc.asm.Label;
8 import com.tc.asm.MethodVisitor;
9 import com.tc.asm.Opcodes;
10
11 public class HashtableMethodCreator implements MethodCreator, Opcodes {
12
13 public void createMethods(ClassVisitor classVisitor) {
14 MethodVisitor mv = classVisitor.visitMethod(ACC_PUBLIC, "getEntry",
15 "(Ljava/lang/Object;)Ljava/util/Hashtable$Entry;", null, null);
16 Label l0 = new Label();
17 mv.visitLabel(l0);
18 mv.visitVarInsn(ALOAD, 0);
19 mv.visitFieldInsn(GETFIELD, "java/util/Hashtable", "table", "[Ljava/util/Hashtable$Entry;");
20 mv.visitVarInsn(ASTORE, 2);
21 Label l1 = new Label();
22 mv.visitLabel(l1);
23 mv.visitVarInsn(ALOAD, 1);
24 mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I");
25 mv.visitVarInsn(ISTORE, 3);
26 Label l2 = new Label();
27 mv.visitLabel(l2);
28 mv.visitVarInsn(ILOAD, 3);
29 mv.visitLdcInsn(new Integer  (2147483647));
30 mv.visitInsn(IAND);
31 mv.visitVarInsn(ALOAD, 2);
32 mv.visitInsn(ARRAYLENGTH);
33 mv.visitInsn(IREM);
34 mv.visitVarInsn(ISTORE, 4);
35 Label l3 = new Label();
36 mv.visitLabel(l3);
37 mv.visitVarInsn(ALOAD, 2);
38 mv.visitVarInsn(ILOAD, 4);
39 mv.visitInsn(AALOAD);
40 mv.visitVarInsn(ASTORE, 5);
41 Label l4 = new Label();
42 mv.visitLabel(l4);
43 mv.visitVarInsn(ALOAD, 5);
44 Label l5 = new Label();
45 mv.visitJumpInsn(IFNULL, l5);
46 Label l6 = new Label();
47 mv.visitLabel(l6);
48 mv.visitVarInsn(ALOAD, 5);
49 mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "hash", "I");
50 mv.visitVarInsn(ILOAD, 3);
51 Label l7 = new Label();
52 mv.visitJumpInsn(IF_ICMPNE, l7);
53 mv.visitVarInsn(ALOAD, 5);
54 mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "key", "Ljava/lang/Object;");
55 mv.visitVarInsn(ALOAD, 1);
56 mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
57 mv.visitJumpInsn(IFEQ, l7);
58 Label l8 = new Label();
59 mv.visitLabel(l8);
60 mv.visitVarInsn(ALOAD, 5);
61 mv.visitTypeInsn(CHECKCAST, "java/util/Hashtable$Entry");
62 mv.visitInsn(ARETURN);
63 mv.visitLabel(l7);
64 mv.visitVarInsn(ALOAD, 5);
65 mv.visitFieldInsn(GETFIELD, "java/util/Hashtable$Entry", "next", "Ljava/util/Hashtable$Entry;");
66 mv.visitVarInsn(ASTORE, 5);
67 mv.visitJumpInsn(GOTO, l4);
68 mv.visitLabel(l5);
69 mv.visitInsn(ACONST_NULL);
70 mv.visitInsn(ARETURN);
71 mv.visitMaxs(0, 0);
72 }
73
74 }
75 |
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