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1
18
19 package alt.jiapi.reflect.instruction;
20
21 import alt.jiapi.reflect.Instruction;
22 import alt.jiapi.file.ConstantPool;
23
24
32 public class CPInstruction extends Instruction {
33 protected ConstantPool cp;
34
35 public CPInstruction(byte[] bytes, ConstantPool cp) {
36 super(bytes);
37 this.cp = cp;
38 }
39
40
44 public int getIndex() {
45 byte[] bytes = getBytes();
46
47 int index = 0;
48 if (bytes.length == 2) {
49 index = bytes[1] & 0xff;
50 }
51 else {
52 index = (short)(bytes[1] << 8);
53 index |= bytes[2] & 0xff;
54 }
55
56 return (0xffff) & index;
57 }
58
59
60 private void setIndex(short index) {
62 byte[] bytes = getBytes();
63
64 if (bytes.length == 2) {
65 if (index > 256) {
66 if (bytes[0] == Opcodes.LDC) {
69 bytes = new byte[3];
70 bytes[0] = Opcodes.LDC_W;
71 bytes[1] = (byte)((index >> 8) & 0xff);
72 bytes[2] = (byte)(index & 0xff);
73 setBytes(bytes);
74 }
75 else {
76 System.err.println("ERROR: cannot change index to " +index+
77 ", because byte[] has only one byte. " +
78 this);
79 }
80 }
81 else {
82 bytes[1] = (byte)index;
83 }
84 }
85 else {
86 bytes[1] = (byte)((index >> 8) & 0xff);
87 bytes[2] = (byte)(index & 0xff);
88 }
89
90 if (getIndex() != index) {
91 System.out.println("ERROR setting index: " + getIndex() + " != " +
92 index + ": " + this);
93 }
94 }
95
96
97 public void replaceConstantPool(ConstantPool newCP) {
98 ConstantPool.Entry entry = getEntry();
99
100 short index = newCP.add(entry);
101
102 setIndex(index);
103 this.cp = newCP;
104 }
105
106
107
110 public ConstantPool.Entry getEntry() {
111 return cp.get(getIndex());
112 }
113
114
117 public ConstantPool getConstantPool() {
118 return cp;
119 }
120
121 public String  toString() {
122 StringBuffer sb = new StringBuffer (super.toString());
123 sb.append(" ; ");
124 sb.append(cp.get(getIndex()));
125
126 return sb.toString();
127 }
128
129 }
130 |
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