1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
/*
* Fernflower - The Analytical Java Decompiler
* http://www.reversed-java.com
*
* (C) 2008 - 2010, Stiver
*
* This software is NEITHER public domain NOR free software
* as per GNU License. See license.txt for more details.
*
* This software is distributed WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE.
*/
package de.fernflower.struct.consts;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import de.fernflower.code.CodeConstants;
import de.fernflower.main.DecompilerContext;
import de.fernflower.modules.renamer.PoolInterceptor;
import de.fernflower.struct.gen.FieldDescriptor;
import de.fernflower.struct.gen.MethodDescriptor;
import de.fernflower.struct.gen.VarType;
public class ConstantPool {
public static final int FIELD = 1;
public static final int METHOD = 2;
// *****************************************************************************
// private fields
// *****************************************************************************
private List<PooledConstant> pool = new ArrayList<PooledConstant>();
private PoolInterceptor interceptor;
// *****************************************************************************
// constructors
// *****************************************************************************
public ConstantPool(DataInputStream in) throws IOException {
int size = in.readUnsignedShort();
int[] pass = new int[size];
// first dummy constant
pool.add(null);
// first pass: read the elements
for (int i = 1; i < size; i++) {
byte tag = (byte)in.readUnsignedByte();
switch (tag) {
case CodeConstants.CONSTANT_Utf8:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Utf8, in.readUTF()));
break;
case CodeConstants.CONSTANT_Integer:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Integer, new Integer(in.readInt())));
break;
case CodeConstants.CONSTANT_Float:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Float, new Float(in.readFloat())));
break;
case CodeConstants.CONSTANT_Long:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Long, new Long(in.readLong())));
pool.add(null);
i++;
break;
case CodeConstants.CONSTANT_Double:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Double, new Double(in.readDouble())));
pool.add(null);
i++;
break;
case CodeConstants.CONSTANT_Class:
case CodeConstants.CONSTANT_String:
case CodeConstants.CONSTANT_MethodType:
pool.add(new PrimitiveConstant(tag, in.readUnsignedShort()));
pass[i] = 1;
break;
case CodeConstants.CONSTANT_Fieldref:
case CodeConstants.CONSTANT_Methodref:
case CodeConstants.CONSTANT_InterfaceMethodref:
case CodeConstants.CONSTANT_NameAndType:
case CodeConstants.CONSTANT_InvokeDynamic:
pool.add(new LinkConstant(tag, in.readUnsignedShort(), in.readUnsignedShort()));
if(tag == CodeConstants.CONSTANT_NameAndType) {
pass[i] = 1;
} else {
pass[i] = 2;
}
break;
case CodeConstants.CONSTANT_MethodHandle:
pool.add(new LinkConstant(tag, in.readUnsignedByte(), in.readUnsignedShort()));
pass[i] = 3;
break;
}
}
// resolving complex pool elements
for(int pass_index = 1; pass_index <= 3; pass_index++) {
for(int i = 1; i < size; i++) {
if(pass[i] == pass_index) {
pool.get(i).resolveConstant(this);
}
}
}
// get global constant pool interceptor instance, if any available
interceptor = DecompilerContext.getPoolInterceptor();
}
// *****************************************************************************
// public methods
// *****************************************************************************
public void writeToOutputStream(DataOutputStream out) throws FileNotFoundException, IOException {
out.writeShort(pool.size());
for(int i=1;i<pool.size();i++) {
PooledConstant cnst = (PooledConstant)pool.get(i);
if(cnst!=null) {
cnst.writeToStream(out);
}
}
}
public static void skipPool(DataInputStream in) throws IOException {
int size = in.readUnsignedShort();
for (int i = 1; i < size; i++) {
switch (in.readUnsignedByte()) {
case CodeConstants.CONSTANT_Utf8:
in.readUTF();
break;
case CodeConstants.CONSTANT_Integer:
case CodeConstants.CONSTANT_Float:
case CodeConstants.CONSTANT_Fieldref:
case CodeConstants.CONSTANT_Methodref:
case CodeConstants.CONSTANT_InterfaceMethodref:
case CodeConstants.CONSTANT_NameAndType:
case CodeConstants.CONSTANT_InvokeDynamic:
in.skip(4);
break;
case CodeConstants.CONSTANT_Long:
case CodeConstants.CONSTANT_Double:
in.skip(8);
i++;
break;
case CodeConstants.CONSTANT_Class:
case CodeConstants.CONSTANT_String:
case CodeConstants.CONSTANT_MethodType:
in.skip(2);
break;
case CodeConstants.CONSTANT_MethodHandle:
in.skip(3);
}
}
}
public int size() {
return pool.size();
}
public String[] getClassElement(int element_type, int class_index, int name_index, int descriptor_index) {
String classname = ((PrimitiveConstant)getConstant(class_index)).getString();
String elementname = ((PrimitiveConstant)getConstant(name_index)).getString();
String descriptor = ((PrimitiveConstant)getConstant(descriptor_index)).getString();
if(interceptor != null) {
String new_element = interceptor.getName(classname+" "+elementname+" "+descriptor);
if(new_element != null) {
elementname = new_element.split(" ")[1];
}
String new_descriptor = buildNewDescriptor(element_type == FIELD?CodeConstants.CONSTANT_Fieldref:CodeConstants.CONSTANT_Methodref,
descriptor);
if(new_descriptor != null) {
descriptor = new_descriptor;
}
}
return new String[] {elementname, descriptor};
}
public PooledConstant getConstant(int index) {
return pool.get(index);
}
public PrimitiveConstant getPrimitiveConstant(int index) {
PrimitiveConstant cn = (PrimitiveConstant)getConstant(index);
if(cn != null && interceptor != null) {
if(cn.type == CodeConstants.CONSTANT_Class) {
String newname = buildNewClassname(cn.getString());
if(newname != null) {
cn = new PrimitiveConstant(CodeConstants.CONSTANT_Class, newname);
}
}
}
return cn;
}
public LinkConstant getLinkConstant(int index) {
LinkConstant ln = (LinkConstant)getConstant(index);
if(ln != null && interceptor != null) {
if(ln.type == CodeConstants.CONSTANT_Fieldref ||
ln.type == CodeConstants.CONSTANT_Methodref ||
ln.type == CodeConstants.CONSTANT_InterfaceMethodref) {
String new_classname = buildNewClassname(ln.classname);
String new_element = interceptor.getName(ln.classname+" "+ln.elementname+" "+ln.descriptor);
String new_descriptor = buildNewDescriptor(ln.type, ln.descriptor);
if(new_classname != null || new_element != null || new_descriptor != null) {
ln = new LinkConstant(ln.type, new_classname==null?ln.classname:new_classname,
new_element==null?ln.elementname:new_element.split(" ")[1],
new_descriptor==null?ln.descriptor:new_descriptor);
}
}
}
return ln;
}
private String buildNewClassname(String classname) {
VarType vt = new VarType(classname, true);
String newname = interceptor.getName(vt.value);
if(newname != null) {
StringBuilder buffer = new StringBuilder();
if(vt.arraydim > 0) {
for(int i=0;i<vt.arraydim;i++) {
buffer.append("[");
}
buffer.append("L"+newname+";");
} else {
buffer.append(newname);
}
return buffer.toString();
}
return null;
}
private String buildNewDescriptor(int type, String descriptor) {
boolean updated = false;
if(type == CodeConstants.CONSTANT_Fieldref) {
FieldDescriptor fd = FieldDescriptor.parseDescriptor(descriptor);
VarType ftype = fd.type;
if(ftype.type == CodeConstants.TYPE_OBJECT) {
String newclname = buildNewClassname(ftype.value);
if(newclname != null) {
ftype.value = newclname;
updated = true;
}
}
if(updated) {
return fd.getDescriptor();
}
} else {
MethodDescriptor md = MethodDescriptor.parseDescriptor(descriptor);
// params
for(VarType partype : md.params) {
if(partype.type == CodeConstants.TYPE_OBJECT) {
String newclname = buildNewClassname(partype.value);
if(newclname != null) {
partype.value = newclname;
updated = true;
}
}
}
// return value
if(md.ret.type == CodeConstants.TYPE_OBJECT) {
String newclname = buildNewClassname(md.ret.value);
if(newclname!=null) {
md.ret.value = newclname;
updated = true;
}
}
if(updated) {
return md.getDescriptor();
}
}
return null;
}
}
|