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1
7
8 package org.gjt.jclasslib.io;
9
10 import org.gjt.jclasslib.bytecode.*;
11
12 import java.io.ByteArrayInputStream  ;
13 import java.io.IOException ;
14 import java.util.ArrayList ;
15 import java.util.List ;
16
17
24 public class ByteCodeReader implements Opcodes {
25
26 private ByteCodeReader() {
27 }
28
29
35 public static List readByteCode(byte[] code) throws IOException {
36 return readByteCode(code, null);
37 }
38
39
46 public static List readByteCode(byte[] code,
47 AbstractInstruction[] prependInstructions)
48 throws IOException {
49
50 ByteCodeInputStream bcis = new ByteCodeInputStream(
51 new ByteArrayInputStream (code)
52 );
53
54 ArrayList instructions = new ArrayList ();
55 if (prependInstructions != null) {
56 for (int i = 0; i < prependInstructions.length; i++) {
57 instructions.add(prependInstructions[i]);
58 }
59 }
60
61 boolean wide = false;
62 AbstractInstruction currentInstruction;
63 while (bcis.getBytesRead() < code.length) {
64 currentInstruction = readNextInstruction(bcis, wide);
65 wide = (currentInstruction.getOpcode() == OPCODE_WIDE);
66 instructions.add(currentInstruction);
67 }
68
69 return instructions;
70 }
71
72 private static AbstractInstruction readNextInstruction(ByteCodeInputStream bcis, boolean wide)
73 throws IOException
74 {
75 AbstractInstruction instruction;
76
77 int opcode = bcis.readUnsignedByte();
78
79 switch (opcode) {
80
81 case OPCODE_WIDE:
82 case OPCODE_NOP:
83 case OPCODE_ACONST_NULL:
84 case OPCODE_ICONST_M1:
85 case OPCODE_ICONST_0:
86 case OPCODE_ICONST_1:
87 case OPCODE_ICONST_2:
88 case OPCODE_ICONST_3:
89 case OPCODE_ICONST_4:
90 case OPCODE_ICONST_5:
91 case OPCODE_LCONST_0:
92 case OPCODE_LCONST_1:
93 case OPCODE_FCONST_0:
94 case OPCODE_FCONST_1:
95 case OPCODE_FCONST_2:
96 case OPCODE_DCONST_0:
97 case OPCODE_DCONST_1:
98 case OPCODE_ILOAD_0:
99 case OPCODE_ILOAD_1:
100 case OPCODE_ILOAD_2:
101 case OPCODE_ILOAD_3:
102 case OPCODE_LLOAD_0:
103 case OPCODE_LLOAD_1:
104 case OPCODE_LLOAD_2:
105 case OPCODE_LLOAD_3:
106 case OPCODE_FLOAD_0:
107 case OPCODE_FLOAD_1:
108 case OPCODE_FLOAD_2:
109 case OPCODE_FLOAD_3:
110 case OPCODE_DLOAD_0:
111 case OPCODE_DLOAD_1:
112 case OPCODE_DLOAD_2:
113 case OPCODE_DLOAD_3:
114 case OPCODE_ALOAD_0:
115 case OPCODE_ALOAD_1:
116 case OPCODE_ALOAD_2:
117 case OPCODE_ALOAD_3:
118 case OPCODE_IALOAD:
119 case OPCODE_LALOAD:
120 case OPCODE_FALOAD:
121 case OPCODE_DALOAD:
122 case OPCODE_AALOAD:
123 case OPCODE_BALOAD:
124 case OPCODE_CALOAD:
125 case OPCODE_SALOAD:
126 case OPCODE_ISTORE_0:
127 case OPCODE_ISTORE_1:
128 case OPCODE_ISTORE_2:
129 case OPCODE_ISTORE_3:
130 case OPCODE_LSTORE_0:
131 case OPCODE_LSTORE_1:
132 case OPCODE_LSTORE_2:
133 case OPCODE_LSTORE_3:
134 case OPCODE_FSTORE_0:
135 case OPCODE_FSTORE_1:
136 case OPCODE_FSTORE_2:
137 case OPCODE_FSTORE_3:
138 case OPCODE_DSTORE_0:
139 case OPCODE_DSTORE_1:
140 case OPCODE_DSTORE_2:
141 case OPCODE_DSTORE_3:
142 case OPCODE_ASTORE_0:
143 case OPCODE_ASTORE_1:
144 case OPCODE_ASTORE_2:
145 case OPCODE_ASTORE_3:
146 case OPCODE_IASTORE:
147 case OPCODE_LASTORE:
148 case OPCODE_FASTORE:
149 case OPCODE_DASTORE:
150 case OPCODE_AASTORE:
151 case OPCODE_BASTORE:
152 case OPCODE_CASTORE:
153 case OPCODE_SASTORE:
154 case OPCODE_POP:
155 case OPCODE_POP2:
156 case OPCODE_DUP:
157 case OPCODE_DUP_X1:
158 case OPCODE_DUP_X2:
159 case OPCODE_DUP2:
160 case OPCODE_DUP2_X1:
161 case OPCODE_DUP2_X2:
162 case OPCODE_SWAP:
163 case OPCODE_IADD:
164 case OPCODE_LADD:
165 case OPCODE_FADD:
166 case OPCODE_DADD:
167 case OPCODE_ISUB:
168 case OPCODE_LSUB:
169 case OPCODE_FSUB:
170 case OPCODE_DSUB:
171 case OPCODE_IMUL:
172 case OPCODE_LMUL:
173 case OPCODE_FMUL:
174 case OPCODE_DMUL:
175 case OPCODE_IDIV:
176 case OPCODE_LDIV:
177 case OPCODE_FDIV:
178 case OPCODE_DDIV:
179 case OPCODE_IREM:
180 case OPCODE_LREM:
181 case OPCODE_FREM:
182 case OPCODE_DREM:
183 case OPCODE_INEG:
184 case OPCODE_LNEG:
185 case OPCODE_FNEG:
186 case OPCODE_DNEG:
187 case OPCODE_ISHL:
188 case OPCODE_LSHL:
189 case OPCODE_ISHR:
190 case OPCODE_LSHR:
191 case OPCODE_IUSHR:
192 case OPCODE_LUSHR:
193 case OPCODE_IAND:
194 case OPCODE_LAND:
195 case OPCODE_IOR:
196 case OPCODE_LOR:
197 case OPCODE_IXOR:
198 case OPCODE_LXOR:
199 case OPCODE_I2L:
200 case OPCODE_I2F:
201 case OPCODE_I2D:
202 case OPCODE_L2I:
203 case OPCODE_L2F:
204 case OPCODE_L2D:
205 case OPCODE_F2I:
206 case OPCODE_F2L:
207 case OPCODE_F2D:
208 case OPCODE_D2I:
209 case OPCODE_D2L:
210 case OPCODE_D2F:
211 case OPCODE_I2B:
212 case OPCODE_I2C:
213 case OPCODE_I2S:
214 case OPCODE_LCMP:
215 case OPCODE_FCMPL:
216 case OPCODE_FCMPG:
217 case OPCODE_DCMPL:
218 case OPCODE_DCMPG:
219 case OPCODE_IRETURN:
220 case OPCODE_LRETURN:
221 case OPCODE_FRETURN:
222 case OPCODE_DRETURN:
223 case OPCODE_ARETURN:
224 case OPCODE_RETURN:
225 case OPCODE_XXXUNUSEDXXX:
226 case OPCODE_ARRAYLENGTH:
227 case OPCODE_ATHROW:
228 case OPCODE_MONITORENTER:
229 case OPCODE_MONITOREXIT:
230 case OPCODE_BREAKPOINT:
231 case OPCODE_IMPDEP1:
232 case OPCODE_IMPDEP2:
233
234 instruction = new SimpleInstruction(opcode);
235 break;
236
237 case OPCODE_BIPUSH:
238 case OPCODE_LDC:
239 case OPCODE_ILOAD: case OPCODE_LLOAD: case OPCODE_FLOAD: case OPCODE_DLOAD: case OPCODE_ALOAD: case OPCODE_ISTORE: case OPCODE_LSTORE: case OPCODE_FSTORE: case OPCODE_DSTORE: case OPCODE_ASTORE: case OPCODE_RET: case OPCODE_NEWARRAY:
251
252 instruction = new ImmediateByteInstruction(opcode, wide);
253 break;
254
255 case OPCODE_LDC_W:
256 case OPCODE_LDC2_W:
257 case OPCODE_GETSTATIC:
258 case OPCODE_PUTSTATIC:
259 case OPCODE_GETFIELD:
260 case OPCODE_PUTFIELD:
261 case OPCODE_INVOKEVIRTUAL:
262 case OPCODE_INVOKESPECIAL:
263 case OPCODE_INVOKESTATIC:
264 case OPCODE_NEW:
265 case OPCODE_ANEWARRAY:
266 case OPCODE_CHECKCAST:
267 case OPCODE_INSTANCEOF:
268 case OPCODE_SIPUSH:
271 instruction = new ImmediateShortInstruction(opcode);
272 break;
273
274 case OPCODE_IFEQ:
275 case OPCODE_IFNE:
276 case OPCODE_IFLT:
277 case OPCODE_IFGE:
278 case OPCODE_IFGT:
279 case OPCODE_IFLE:
280 case OPCODE_IF_ICMPEQ:
281 case OPCODE_IF_ICMPNE:
282 case OPCODE_IF_ICMPLT:
283 case OPCODE_IF_ICMPGE:
284 case OPCODE_IF_ICMPGT:
285 case OPCODE_IF_ICMPLE:
286 case OPCODE_IF_ACMPEQ:
287 case OPCODE_IF_ACMPNE:
288 case OPCODE_GOTO:
289 case OPCODE_JSR:
290 case OPCODE_IFNULL:
291 case OPCODE_IFNONNULL:
292
293 instruction = new BranchInstruction(opcode);
294 break;
295
296 case OPCODE_GOTO_W:
297 case OPCODE_JSR_W:
298
299 instruction = new ImmediateIntInstruction(opcode);
300 break;
301
302 case OPCODE_IINC:
304 instruction = new IncrementInstruction(opcode, wide);
305 break;
306
307 case OPCODE_TABLESWITCH:
308
309 instruction = new TableSwitchInstruction(opcode);
310 break;
311
312 case OPCODE_LOOKUPSWITCH:
313
314 instruction = new LookupSwitchInstruction(opcode);
315 break;
316
317 case OPCODE_INVOKEINTERFACE:
318
319 instruction = new InvokeInterfaceInstruction(opcode);
320 break;
321
322 case OPCODE_MULTIANEWARRAY:
323
324 instruction = new MultianewarrayInstruction(opcode);
325 break;
326
327 default:
328 throw new IOException ("invalid opcode 0x" + Integer.toHexString(opcode));
329 }
330
331 instruction.read(bcis);
332 return instruction;
333 }
334
335 }
336 |
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