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comparison graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/Bytecodes.java @ 21713:454a99ca00a9

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fixed canonicalizeprojects issues
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 22:13:10 +0200
parents graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/Bytecodes.java@1c41d00e6b2f
children
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21712:a59a0c85650a 21713:454a99ca00a9
1 /*
2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.bytecode;
24
25 import static com.oracle.jvmci.bytecode.Bytecodes.Flags.*;
26
27 import java.lang.reflect.*;
28
29 /**
30 * Definitions of the standard Java bytecodes defined by <a href=
31 * "http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html"> Java Virtual
32 * Machine Specification</a>.
33 */
34 public class Bytecodes {
35
36 // @formatter:off
37 public static final int NOP = 0; // 0x00
38 public static final int ACONST_NULL = 1; // 0x01
39 public static final int ICONST_M1 = 2; // 0x02
40 public static final int ICONST_0 = 3; // 0x03
41 public static final int ICONST_1 = 4; // 0x04
42 public static final int ICONST_2 = 5; // 0x05
43 public static final int ICONST_3 = 6; // 0x06
44 public static final int ICONST_4 = 7; // 0x07
45 public static final int ICONST_5 = 8; // 0x08
46 public static final int LCONST_0 = 9; // 0x09
47 public static final int LCONST_1 = 10; // 0x0A
48 public static final int FCONST_0 = 11; // 0x0B
49 public static final int FCONST_1 = 12; // 0x0C
50 public static final int FCONST_2 = 13; // 0x0D
51 public static final int DCONST_0 = 14; // 0x0E
52 public static final int DCONST_1 = 15; // 0x0F
53 public static final int BIPUSH = 16; // 0x10
54 public static final int SIPUSH = 17; // 0x11
55 public static final int LDC = 18; // 0x12
56 public static final int LDC_W = 19; // 0x13
57 public static final int LDC2_W = 20; // 0x14
58 public static final int ILOAD = 21; // 0x15
59 public static final int LLOAD = 22; // 0x16
60 public static final int FLOAD = 23; // 0x17
61 public static final int DLOAD = 24; // 0x18
62 public static final int ALOAD = 25; // 0x19
63 public static final int ILOAD_0 = 26; // 0x1A
64 public static final int ILOAD_1 = 27; // 0x1B
65 public static final int ILOAD_2 = 28; // 0x1C
66 public static final int ILOAD_3 = 29; // 0x1D
67 public static final int LLOAD_0 = 30; // 0x1E
68 public static final int LLOAD_1 = 31; // 0x1F
69 public static final int LLOAD_2 = 32; // 0x20
70 public static final int LLOAD_3 = 33; // 0x21
71 public static final int FLOAD_0 = 34; // 0x22
72 public static final int FLOAD_1 = 35; // 0x23
73 public static final int FLOAD_2 = 36; // 0x24
74 public static final int FLOAD_3 = 37; // 0x25
75 public static final int DLOAD_0 = 38; // 0x26
76 public static final int DLOAD_1 = 39; // 0x27
77 public static final int DLOAD_2 = 40; // 0x28
78 public static final int DLOAD_3 = 41; // 0x29
79 public static final int ALOAD_0 = 42; // 0x2A
80 public static final int ALOAD_1 = 43; // 0x2B
81 public static final int ALOAD_2 = 44; // 0x2C
82 public static final int ALOAD_3 = 45; // 0x2D
83 public static final int IALOAD = 46; // 0x2E
84 public static final int LALOAD = 47; // 0x2F
85 public static final int FALOAD = 48; // 0x30
86 public static final int DALOAD = 49; // 0x31
87 public static final int AALOAD = 50; // 0x32
88 public static final int BALOAD = 51; // 0x33
89 public static final int CALOAD = 52; // 0x34
90 public static final int SALOAD = 53; // 0x35
91 public static final int ISTORE = 54; // 0x36
92 public static final int LSTORE = 55; // 0x37
93 public static final int FSTORE = 56; // 0x38
94 public static final int DSTORE = 57; // 0x39
95 public static final int ASTORE = 58; // 0x3A
96 public static final int ISTORE_0 = 59; // 0x3B
97 public static final int ISTORE_1 = 60; // 0x3C
98 public static final int ISTORE_2 = 61; // 0x3D
99 public static final int ISTORE_3 = 62; // 0x3E
100 public static final int LSTORE_0 = 63; // 0x3F
101 public static final int LSTORE_1 = 64; // 0x40
102 public static final int LSTORE_2 = 65; // 0x41
103 public static final int LSTORE_3 = 66; // 0x42
104 public static final int FSTORE_0 = 67; // 0x43
105 public static final int FSTORE_1 = 68; // 0x44
106 public static final int FSTORE_2 = 69; // 0x45
107 public static final int FSTORE_3 = 70; // 0x46
108 public static final int DSTORE_0 = 71; // 0x47
109 public static final int DSTORE_1 = 72; // 0x48
110 public static final int DSTORE_2 = 73; // 0x49
111 public static final int DSTORE_3 = 74; // 0x4A
112 public static final int ASTORE_0 = 75; // 0x4B
113 public static final int ASTORE_1 = 76; // 0x4C
114 public static final int ASTORE_2 = 77; // 0x4D
115 public static final int ASTORE_3 = 78; // 0x4E
116 public static final int IASTORE = 79; // 0x4F
117 public static final int LASTORE = 80; // 0x50
118 public static final int FASTORE = 81; // 0x51
119 public static final int DASTORE = 82; // 0x52
120 public static final int AASTORE = 83; // 0x53
121 public static final int BASTORE = 84; // 0x54
122 public static final int CASTORE = 85; // 0x55
123 public static final int SASTORE = 86; // 0x56
124 public static final int POP = 87; // 0x57
125 public static final int POP2 = 88; // 0x58
126 public static final int DUP = 89; // 0x59
127 public static final int DUP_X1 = 90; // 0x5A
128 public static final int DUP_X2 = 91; // 0x5B
129 public static final int DUP2 = 92; // 0x5C
130 public static final int DUP2_X1 = 93; // 0x5D
131 public static final int DUP2_X2 = 94; // 0x5E
132 public static final int SWAP = 95; // 0x5F
133 public static final int IADD = 96; // 0x60
134 public static final int LADD = 97; // 0x61
135 public static final int FADD = 98; // 0x62
136 public static final int DADD = 99; // 0x63
137 public static final int ISUB = 100; // 0x64
138 public static final int LSUB = 101; // 0x65
139 public static final int FSUB = 102; // 0x66
140 public static final int DSUB = 103; // 0x67
141 public static final int IMUL = 104; // 0x68
142 public static final int LMUL = 105; // 0x69
143 public static final int FMUL = 106; // 0x6A
144 public static final int DMUL = 107; // 0x6B
145 public static final int IDIV = 108; // 0x6C
146 public static final int LDIV = 109; // 0x6D
147 public static final int FDIV = 110; // 0x6E
148 public static final int DDIV = 111; // 0x6F
149 public static final int IREM = 112; // 0x70
150 public static final int LREM = 113; // 0x71
151 public static final int FREM = 114; // 0x72
152 public static final int DREM = 115; // 0x73
153 public static final int INEG = 116; // 0x74
154 public static final int LNEG = 117; // 0x75
155 public static final int FNEG = 118; // 0x76
156 public static final int DNEG = 119; // 0x77
157 public static final int ISHL = 120; // 0x78
158 public static final int LSHL = 121; // 0x79
159 public static final int ISHR = 122; // 0x7A
160 public static final int LSHR = 123; // 0x7B
161 public static final int IUSHR = 124; // 0x7C
162 public static final int LUSHR = 125; // 0x7D
163 public static final int IAND = 126; // 0x7E
164 public static final int LAND = 127; // 0x7F
165 public static final int IOR = 128; // 0x80
166 public static final int LOR = 129; // 0x81
167 public static final int IXOR = 130; // 0x82
168 public static final int LXOR = 131; // 0x83
169 public static final int IINC = 132; // 0x84
170 public static final int I2L = 133; // 0x85
171 public static final int I2F = 134; // 0x86
172 public static final int I2D = 135; // 0x87
173 public static final int L2I = 136; // 0x88
174 public static final int L2F = 137; // 0x89
175 public static final int L2D = 138; // 0x8A
176 public static final int F2I = 139; // 0x8B
177 public static final int F2L = 140; // 0x8C
178 public static final int F2D = 141; // 0x8D
179 public static final int D2I = 142; // 0x8E
180 public static final int D2L = 143; // 0x8F
181 public static final int D2F = 144; // 0x90
182 public static final int I2B = 145; // 0x91
183 public static final int I2C = 146; // 0x92
184 public static final int I2S = 147; // 0x93
185 public static final int LCMP = 148; // 0x94
186 public static final int FCMPL = 149; // 0x95
187 public static final int FCMPG = 150; // 0x96
188 public static final int DCMPL = 151; // 0x97
189 public static final int DCMPG = 152; // 0x98
190 public static final int IFEQ = 153; // 0x99
191 public static final int IFNE = 154; // 0x9A
192 public static final int IFLT = 155; // 0x9B
193 public static final int IFGE = 156; // 0x9C
194 public static final int IFGT = 157; // 0x9D
195 public static final int IFLE = 158; // 0x9E
196 public static final int IF_ICMPEQ = 159; // 0x9F
197 public static final int IF_ICMPNE = 160; // 0xA0
198 public static final int IF_ICMPLT = 161; // 0xA1
199 public static final int IF_ICMPGE = 162; // 0xA2
200 public static final int IF_ICMPGT = 163; // 0xA3
201 public static final int IF_ICMPLE = 164; // 0xA4
202 public static final int IF_ACMPEQ = 165; // 0xA5
203 public static final int IF_ACMPNE = 166; // 0xA6
204 public static final int GOTO = 167; // 0xA7
205 public static final int JSR = 168; // 0xA8
206 public static final int RET = 169; // 0xA9
207 public static final int TABLESWITCH = 170; // 0xAA
208 public static final int LOOKUPSWITCH = 171; // 0xAB
209 public static final int IRETURN = 172; // 0xAC
210 public static final int LRETURN = 173; // 0xAD
211 public static final int FRETURN = 174; // 0xAE
212 public static final int DRETURN = 175; // 0xAF
213 public static final int ARETURN = 176; // 0xB0
214 public static final int RETURN = 177; // 0xB1
215 public static final int GETSTATIC = 178; // 0xB2
216 public static final int PUTSTATIC = 179; // 0xB3
217 public static final int GETFIELD = 180; // 0xB4
218 public static final int PUTFIELD = 181; // 0xB5
219 public static final int INVOKEVIRTUAL = 182; // 0xB6
220 public static final int INVOKESPECIAL = 183; // 0xB7
221 public static final int INVOKESTATIC = 184; // 0xB8
222 public static final int INVOKEINTERFACE = 185; // 0xB9
223 public static final int INVOKEDYNAMIC = 186; // 0xBA
224 public static final int NEW = 187; // 0xBB
225 public static final int NEWARRAY = 188; // 0xBC
226 public static final int ANEWARRAY = 189; // 0xBD
227 public static final int ARRAYLENGTH = 190; // 0xBE
228 public static final int ATHROW = 191; // 0xBF
229 public static final int CHECKCAST = 192; // 0xC0
230 public static final int INSTANCEOF = 193; // 0xC1
231 public static final int MONITORENTER = 194; // 0xC2
232 public static final int MONITOREXIT = 195; // 0xC3
233 public static final int WIDE = 196; // 0xC4
234 public static final int MULTIANEWARRAY = 197; // 0xC5
235 public static final int IFNULL = 198; // 0xC6
236 public static final int IFNONNULL = 199; // 0xC7
237 public static final int GOTO_W = 200; // 0xC8
238 public static final int JSR_W = 201; // 0xC9
239 public static final int BREAKPOINT = 202; // 0xCA
240
241 public static final int ILLEGAL = 255;
242 public static final int END = 256;
243 // @formatter:on
244
245 /**
246 * The last opcode defined by the JVM specification. To iterate over all JVM bytecodes:
247 *
248 * <pre>
249 * for (int opcode = 0; opcode &lt;= Bytecodes.LAST_JVM_OPCODE; ++opcode) {
250 * //
251 * }
252 * </pre>
253 */
254 public static final int LAST_JVM_OPCODE = JSR_W;
255
256 /**
257 * A collection of flags describing various bytecode attributes.
258 */
259 static class Flags {
260
261 /**
262 * Denotes an instruction that ends a basic block and does not let control flow fall through
263 * to its lexical successor.
264 */
265 static final int STOP = 0x00000001;
266
267 /**
268 * Denotes an instruction that ends a basic block and may let control flow fall through to
269 * its lexical successor. In practice this means it is a conditional branch.
270 */
271 static final int FALL_THROUGH = 0x00000002;
272
273 /**
274 * Denotes an instruction that has a 2 or 4 byte operand that is an offset to another
275 * instruction in the same method. This does not include the {@link Bytecodes#TABLESWITCH}
276 * or {@link Bytecodes#LOOKUPSWITCH} instructions.
277 */
278 static final int BRANCH = 0x00000004;
279
280 /**
281 * Denotes an instruction that reads the value of a static or instance field.
282 */
283 static final int FIELD_READ = 0x00000008;
284
285 /**
286 * Denotes an instruction that writes the value of a static or instance field.
287 */
288 static final int FIELD_WRITE = 0x00000010;
289
290 /**
291 * Denotes an instruction that can cause a trap.
292 */
293 static final int TRAP = 0x00000080;
294 /**
295 * Denotes an instruction that is commutative.
296 */
297 static final int COMMUTATIVE = 0x00000100;
298 /**
299 * Denotes an instruction that is associative.
300 */
301 static final int ASSOCIATIVE = 0x00000200;
302 /**
303 * Denotes an instruction that loads an operand.
304 */
305 static final int LOAD = 0x00000400;
306 /**
307 * Denotes an instruction that stores an operand.
308 */
309 static final int STORE = 0x00000800;
310 /**
311 * Denotes the 4 INVOKE* instructions.
312 */
313 static final int INVOKE = 0x00001000;
314 }
315
316 // Performs a sanity check that none of the flags overlap.
317 static {
318 int allFlags = 0;
319 try {
320 for (Field field : Flags.class.getDeclaredFields()) {
321 int flagsFilter = Modifier.FINAL | Modifier.STATIC;
322 if ((field.getModifiers() & flagsFilter) == flagsFilter && !field.isSynthetic()) {
323 assert field.getType() == int.class : "Field is not int : " + field;
324 final int flag = field.getInt(null);
325 assert flag != 0;
326 assert (flag & allFlags) == 0 : field.getName() + " has a value conflicting with another flag";
327 allFlags |= flag;
328 }
329 }
330 } catch (Exception e) {
331 throw new InternalError(e.toString());
332 }
333 }
334
335 /**
336 * An array that maps from a bytecode value to a {@link String} for the corresponding
337 * instruction mnemonic.
338 */
339 private static final String[] nameArray = new String[256];
340
341 /**
342 * An array that maps from a bytecode value to the set of {@link Flags} for the corresponding
343 * instruction.
344 */
345 private static final int[] flagsArray = new int[256];
346
347 /**
348 * An array that maps from a bytecode value to the length in bytes for the corresponding
349 * instruction.
350 */
351 private static final int[] lengthArray = new int[256];
352
353 /**
354 * An array that maps from a bytecode value to the number of slots pushed on the stack by the
355 * corresponding instruction.
356 */
357 private static final int[] stackEffectArray = new int[256];
358
359 // Checkstyle: stop
360 // @formatter:off
361 static {
362 def(NOP , "nop" , "b" , 0);
363 def(ACONST_NULL , "aconst_null" , "b" , 1);
364 def(ICONST_M1 , "iconst_m1" , "b" , 1);
365 def(ICONST_0 , "iconst_0" , "b" , 1);
366 def(ICONST_1 , "iconst_1" , "b" , 1);
367 def(ICONST_2 , "iconst_2" , "b" , 1);
368 def(ICONST_3 , "iconst_3" , "b" , 1);
369 def(ICONST_4 , "iconst_4" , "b" , 1);
370 def(ICONST_5 , "iconst_5" , "b" , 1);
371 def(LCONST_0 , "lconst_0" , "b" , 2);
372 def(LCONST_1 , "lconst_1" , "b" , 2);
373 def(FCONST_0 , "fconst_0" , "b" , 1);
374 def(FCONST_1 , "fconst_1" , "b" , 1);
375 def(FCONST_2 , "fconst_2" , "b" , 1);
376 def(DCONST_0 , "dconst_0" , "b" , 2);
377 def(DCONST_1 , "dconst_1" , "b" , 2);
378 def(BIPUSH , "bipush" , "bc" , 1);
379 def(SIPUSH , "sipush" , "bcc" , 1);
380 def(LDC , "ldc" , "bi" , 1, TRAP);
381 def(LDC_W , "ldc_w" , "bii" , 1, TRAP);
382 def(LDC2_W , "ldc2_w" , "bii" , 2, TRAP);
383 def(ILOAD , "iload" , "bi" , 1, LOAD);
384 def(LLOAD , "lload" , "bi" , 2, LOAD);
385 def(FLOAD , "fload" , "bi" , 1, LOAD);
386 def(DLOAD , "dload" , "bi" , 2, LOAD);
387 def(ALOAD , "aload" , "bi" , 1, LOAD);
388 def(ILOAD_0 , "iload_0" , "b" , 1, LOAD);
389 def(ILOAD_1 , "iload_1" , "b" , 1, LOAD);
390 def(ILOAD_2 , "iload_2" , "b" , 1, LOAD);
391 def(ILOAD_3 , "iload_3" , "b" , 1, LOAD);
392 def(LLOAD_0 , "lload_0" , "b" , 2, LOAD);
393 def(LLOAD_1 , "lload_1" , "b" , 2, LOAD);
394 def(LLOAD_2 , "lload_2" , "b" , 2, LOAD);
395 def(LLOAD_3 , "lload_3" , "b" , 2, LOAD);
396 def(FLOAD_0 , "fload_0" , "b" , 1, LOAD);
397 def(FLOAD_1 , "fload_1" , "b" , 1, LOAD);
398 def(FLOAD_2 , "fload_2" , "b" , 1, LOAD);
399 def(FLOAD_3 , "fload_3" , "b" , 1, LOAD);
400 def(DLOAD_0 , "dload_0" , "b" , 2, LOAD);
401 def(DLOAD_1 , "dload_1" , "b" , 2, LOAD);
402 def(DLOAD_2 , "dload_2" , "b" , 2, LOAD);
403 def(DLOAD_3 , "dload_3" , "b" , 2, LOAD);
404 def(ALOAD_0 , "aload_0" , "b" , 1, LOAD);
405 def(ALOAD_1 , "aload_1" , "b" , 1, LOAD);
406 def(ALOAD_2 , "aload_2" , "b" , 1, LOAD);
407 def(ALOAD_3 , "aload_3" , "b" , 1, LOAD);
408 def(IALOAD , "iaload" , "b" , -1, TRAP);
409 def(LALOAD , "laload" , "b" , 0, TRAP);
410 def(FALOAD , "faload" , "b" , -1, TRAP);
411 def(DALOAD , "daload" , "b" , 0, TRAP);
412 def(AALOAD , "aaload" , "b" , -1, TRAP);
413 def(BALOAD , "baload" , "b" , -1, TRAP);
414 def(CALOAD , "caload" , "b" , -1, TRAP);
415 def(SALOAD , "saload" , "b" , -1, TRAP);
416 def(ISTORE , "istore" , "bi" , -1, STORE);
417 def(LSTORE , "lstore" , "bi" , -2, STORE);
418 def(FSTORE , "fstore" , "bi" , -1, STORE);
419 def(DSTORE , "dstore" , "bi" , -2, STORE);
420 def(ASTORE , "astore" , "bi" , -1, STORE);
421 def(ISTORE_0 , "istore_0" , "b" , -1, STORE);
422 def(ISTORE_1 , "istore_1" , "b" , -1, STORE);
423 def(ISTORE_2 , "istore_2" , "b" , -1, STORE);
424 def(ISTORE_3 , "istore_3" , "b" , -1, STORE);
425 def(LSTORE_0 , "lstore_0" , "b" , -2, STORE);
426 def(LSTORE_1 , "lstore_1" , "b" , -2, STORE);
427 def(LSTORE_2 , "lstore_2" , "b" , -2, STORE);
428 def(LSTORE_3 , "lstore_3" , "b" , -2, STORE);
429 def(FSTORE_0 , "fstore_0" , "b" , -1, STORE);
430 def(FSTORE_1 , "fstore_1" , "b" , -1, STORE);
431 def(FSTORE_2 , "fstore_2" , "b" , -1, STORE);
432 def(FSTORE_3 , "fstore_3" , "b" , -1, STORE);
433 def(DSTORE_0 , "dstore_0" , "b" , -2, STORE);
434 def(DSTORE_1 , "dstore_1" , "b" , -2, STORE);
435 def(DSTORE_2 , "dstore_2" , "b" , -2, STORE);
436 def(DSTORE_3 , "dstore_3" , "b" , -2, STORE);
437 def(ASTORE_0 , "astore_0" , "b" , -1, STORE);
438 def(ASTORE_1 , "astore_1" , "b" , -1, STORE);
439 def(ASTORE_2 , "astore_2" , "b" , -1, STORE);
440 def(ASTORE_3 , "astore_3" , "b" , -1, STORE);
441 def(IASTORE , "iastore" , "b" , -3, TRAP);
442 def(LASTORE , "lastore" , "b" , -4, TRAP);
443 def(FASTORE , "fastore" , "b" , -3, TRAP);
444 def(DASTORE , "dastore" , "b" , -4, TRAP);
445 def(AASTORE , "aastore" , "b" , -3, TRAP);
446 def(BASTORE , "bastore" , "b" , -3, TRAP);
447 def(CASTORE , "castore" , "b" , -3, TRAP);
448 def(SASTORE , "sastore" , "b" , -3, TRAP);
449 def(POP , "pop" , "b" , -1);
450 def(POP2 , "pop2" , "b" , -2);
451 def(DUP , "dup" , "b" , 1);
452 def(DUP_X1 , "dup_x1" , "b" , 1);
453 def(DUP_X2 , "dup_x2" , "b" , 1);
454 def(DUP2 , "dup2" , "b" , 2);
455 def(DUP2_X1 , "dup2_x1" , "b" , 2);
456 def(DUP2_X2 , "dup2_x2" , "b" , 2);
457 def(SWAP , "swap" , "b" , 0);
458 def(IADD , "iadd" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
459 def(LADD , "ladd" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
460 def(FADD , "fadd" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
461 def(DADD , "dadd" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
462 def(ISUB , "isub" , "b" , -1);
463 def(LSUB , "lsub" , "b" , -2);
464 def(FSUB , "fsub" , "b" , -1);
465 def(DSUB , "dsub" , "b" , -2);
466 def(IMUL , "imul" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
467 def(LMUL , "lmul" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
468 def(FMUL , "fmul" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
469 def(DMUL , "dmul" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
470 def(IDIV , "idiv" , "b" , -1, TRAP);
471 def(LDIV , "ldiv" , "b" , -2, TRAP);
472 def(FDIV , "fdiv" , "b" , -1);
473 def(DDIV , "ddiv" , "b" , -2);
474 def(IREM , "irem" , "b" , -1, TRAP);
475 def(LREM , "lrem" , "b" , -2, TRAP);
476 def(FREM , "frem" , "b" , -1);
477 def(DREM , "drem" , "b" , -2);
478 def(INEG , "ineg" , "b" , 0);
479 def(LNEG , "lneg" , "b" , 0);
480 def(FNEG , "fneg" , "b" , 0);
481 def(DNEG , "dneg" , "b" , 0);
482 def(ISHL , "ishl" , "b" , -1);
483 def(LSHL , "lshl" , "b" , -1);
484 def(ISHR , "ishr" , "b" , -1);
485 def(LSHR , "lshr" , "b" , -1);
486 def(IUSHR , "iushr" , "b" , -1);
487 def(LUSHR , "lushr" , "b" , -1);
488 def(IAND , "iand" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
489 def(LAND , "land" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
490 def(IOR , "ior" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
491 def(LOR , "lor" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
492 def(IXOR , "ixor" , "b" , -1, COMMUTATIVE | ASSOCIATIVE);
493 def(LXOR , "lxor" , "b" , -2, COMMUTATIVE | ASSOCIATIVE);
494 def(IINC , "iinc" , "bic" , 0, LOAD | STORE);
495 def(I2L , "i2l" , "b" , 1);
496 def(I2F , "i2f" , "b" , 0);
497 def(I2D , "i2d" , "b" , 1);
498 def(L2I , "l2i" , "b" , -1);
499 def(L2F , "l2f" , "b" , -1);
500 def(L2D , "l2d" , "b" , 0);
501 def(F2I , "f2i" , "b" , 0);
502 def(F2L , "f2l" , "b" , 1);
503 def(F2D , "f2d" , "b" , 1);
504 def(D2I , "d2i" , "b" , -1);
505 def(D2L , "d2l" , "b" , 0);
506 def(D2F , "d2f" , "b" , -1);
507 def(I2B , "i2b" , "b" , 0);
508 def(I2C , "i2c" , "b" , 0);
509 def(I2S , "i2s" , "b" , 0);
510 def(LCMP , "lcmp" , "b" , -3);
511 def(FCMPL , "fcmpl" , "b" , -1);
512 def(FCMPG , "fcmpg" , "b" , -1);
513 def(DCMPL , "dcmpl" , "b" , -3);
514 def(DCMPG , "dcmpg" , "b" , -3);
515 def(IFEQ , "ifeq" , "boo" , -1, FALL_THROUGH | BRANCH);
516 def(IFNE , "ifne" , "boo" , -1, FALL_THROUGH | BRANCH);
517 def(IFLT , "iflt" , "boo" , -1, FALL_THROUGH | BRANCH);
518 def(IFGE , "ifge" , "boo" , -1, FALL_THROUGH | BRANCH);
519 def(IFGT , "ifgt" , "boo" , -1, FALL_THROUGH | BRANCH);
520 def(IFLE , "ifle" , "boo" , -1, FALL_THROUGH | BRANCH);
521 def(IF_ICMPEQ , "if_icmpeq" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH);
522 def(IF_ICMPNE , "if_icmpne" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH);
523 def(IF_ICMPLT , "if_icmplt" , "boo" , -2, FALL_THROUGH | BRANCH);
524 def(IF_ICMPGE , "if_icmpge" , "boo" , -2, FALL_THROUGH | BRANCH);
525 def(IF_ICMPGT , "if_icmpgt" , "boo" , -2, FALL_THROUGH | BRANCH);
526 def(IF_ICMPLE , "if_icmple" , "boo" , -2, FALL_THROUGH | BRANCH);
527 def(IF_ACMPEQ , "if_acmpeq" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH);
528 def(IF_ACMPNE , "if_acmpne" , "boo" , -2, COMMUTATIVE | FALL_THROUGH | BRANCH);
529 def(GOTO , "goto" , "boo" , 0, STOP | BRANCH);
530 def(JSR , "jsr" , "boo" , 0, STOP | BRANCH);
531 def(RET , "ret" , "bi" , 0, STOP);
532 def(TABLESWITCH , "tableswitch" , "" , -1, STOP);
533 def(LOOKUPSWITCH , "lookupswitch" , "" , -1, STOP);
534 def(IRETURN , "ireturn" , "b" , -1, TRAP | STOP);
535 def(LRETURN , "lreturn" , "b" , -2, TRAP | STOP);
536 def(FRETURN , "freturn" , "b" , -1, TRAP | STOP);
537 def(DRETURN , "dreturn" , "b" , -2, TRAP | STOP);
538 def(ARETURN , "areturn" , "b" , -1, TRAP | STOP);
539 def(RETURN , "return" , "b" , 0, TRAP | STOP);
540 def(GETSTATIC , "getstatic" , "bjj" , 1, TRAP | FIELD_READ);
541 def(PUTSTATIC , "putstatic" , "bjj" , -1, TRAP | FIELD_WRITE);
542 def(GETFIELD , "getfield" , "bjj" , 0, TRAP | FIELD_READ);
543 def(PUTFIELD , "putfield" , "bjj" , -2, TRAP | FIELD_WRITE);
544 def(INVOKEVIRTUAL , "invokevirtual" , "bjj" , -1, TRAP | INVOKE);
545 def(INVOKESPECIAL , "invokespecial" , "bjj" , -1, TRAP | INVOKE);
546 def(INVOKESTATIC , "invokestatic" , "bjj" , 0, TRAP | INVOKE);
547 def(INVOKEINTERFACE , "invokeinterface" , "bjja_", -1, TRAP | INVOKE);
548 def(INVOKEDYNAMIC , "invokedynamic" , "bjjjj", 0, TRAP | INVOKE);
549 def(NEW , "new" , "bii" , 1, TRAP);
550 def(NEWARRAY , "newarray" , "bc" , 0, TRAP);
551 def(ANEWARRAY , "anewarray" , "bii" , 0, TRAP);
552 def(ARRAYLENGTH , "arraylength" , "b" , 0, TRAP);
553 def(ATHROW , "athrow" , "b" , -1, TRAP | STOP);
554 def(CHECKCAST , "checkcast" , "bii" , 0, TRAP);
555 def(INSTANCEOF , "instanceof" , "bii" , 0, TRAP);
556 def(MONITORENTER , "monitorenter" , "b" , -1, TRAP);
557 def(MONITOREXIT , "monitorexit" , "b" , -1, TRAP);
558 def(WIDE , "wide" , "" , 0);
559 def(MULTIANEWARRAY , "multianewarray" , "biic" , 1, TRAP);
560 def(IFNULL , "ifnull" , "boo" , -1, FALL_THROUGH | BRANCH);
561 def(IFNONNULL , "ifnonnull" , "boo" , -1, FALL_THROUGH | BRANCH);
562 def(GOTO_W , "goto_w" , "boooo", 0, STOP | BRANCH);
563 def(JSR_W , "jsr_w" , "boooo", 0, STOP | BRANCH);
564 def(BREAKPOINT , "breakpoint" , "b" , 0, TRAP);
565 }
566 // @formatter:on
567 // Checkstyle: resume
568
569 /**
570 * Determines if an opcode is commutative.
571 *
572 * @param opcode the opcode to check
573 * @return {@code true} iff commutative
574 */
575 public static boolean isCommutative(int opcode) {
576 return (flagsArray[opcode & 0xff] & COMMUTATIVE) != 0;
577 }
578
579 /**
580 * Gets the length of an instruction denoted by a given opcode.
581 *
582 * @param opcode an instruction opcode
583 * @return the length of the instruction denoted by {@code opcode}. If {@code opcode} is an
584 * illegal instruction or denotes a variable length instruction (e.g.
585 * {@link #TABLESWITCH}), then 0 is returned.
586 */
587 public static int lengthOf(int opcode) {
588 return lengthArray[opcode & 0xff];
589 }
590
591 /**
592 * Gets the effect on the depth of the expression stack of an instruction denoted by a given
593 * opcode.
594 *
595 * @param opcode an instruction opcode
596 * @return the change in the stack caused by the instruction denoted by {@code opcode}. If
597 * {@code opcode} is an illegal instruction then 0 is returned. Note that invoke
598 * instructions may pop more arguments so this value is a minimum stack effect.
599 */
600 public static int stackEffectOf(int opcode) {
601 return stackEffectArray[opcode & 0xff];
602 }
603
604 /**
605 * Gets the lower-case mnemonic for a given opcode.
606 *
607 * @param opcode an opcode
608 * @return the mnemonic for {@code opcode} or {@code "<illegal opcode: " + opcode + ">"} if
609 * {@code opcode} is not a legal opcode
610 */
611 public static String nameOf(int opcode) throws IllegalArgumentException {
612 String name = nameArray[opcode & 0xff];
613 if (name == null) {
614 return "<illegal opcode: " + opcode + ">";
615 }
616 return name;
617 }
618
619 /**
620 * Allocation-free version of {@linkplain #nameOf(int)}.
621 *
622 * @param opcode an opcode.
623 * @return the mnemonic for {@code opcode} or {@code "<illegal opcode>"} if {@code opcode} is
624 * not a legal opcode.
625 */
626 public static String baseNameOf(int opcode) {
627 String name = nameArray[opcode & 0xff];
628 if (name == null) {
629 return "<illegal opcode>";
630 }
631 return name;
632 }
633
634 /**
635 * Gets the opcode corresponding to a given mnemonic.
636 *
637 * @param name an opcode mnemonic
638 * @return the opcode corresponding to {@code mnemonic}
639 * @throws IllegalArgumentException if {@code name} does not denote a valid opcode
640 */
641 public static int valueOf(String name) {
642 for (int opcode = 0; opcode < nameArray.length; ++opcode) {
643 if (name.equalsIgnoreCase(nameArray[opcode])) {
644 return opcode;
645 }
646 }
647 throw new IllegalArgumentException("No opcode for " + name);
648 }
649
650 /**
651 * Determines if a given opcode denotes an instruction that can cause an implicit exception.
652 *
653 * @param opcode an opcode to test
654 * @return {@code true} iff {@code opcode} can cause an implicit exception, {@code false}
655 * otherwise
656 */
657 public static boolean canTrap(int opcode) {
658 return (flagsArray[opcode & 0xff] & TRAP) != 0;
659 }
660
661 /**
662 * Determines if a given opcode denotes an instruction that loads a local variable to the
663 * operand stack.
664 *
665 * @param opcode an opcode to test
666 * @return {@code true} iff {@code opcode} loads a local variable to the operand stack,
667 * {@code false} otherwise
668 */
669 public static boolean isLoad(int opcode) {
670 return (flagsArray[opcode & 0xff] & LOAD) != 0;
671 }
672
673 /**
674 * Determines if a given opcode denotes an instruction that ends a basic block and does not let
675 * control flow fall through to its lexical successor.
676 *
677 * @param opcode an opcode to test
678 * @return {@code true} iff {@code opcode} properly ends a basic block
679 */
680 public static boolean isStop(int opcode) {
681 return (flagsArray[opcode & 0xff] & STOP) != 0;
682 }
683
684 /**
685 * Determines if a given opcode denotes an instruction that stores a value to a local variable
686 * after popping it from the operand stack.
687 *
688 * @param opcode an opcode to test
689 * @return {@code true} iff {@code opcode} stores a value to a local variable, {@code false}
690 * otherwise
691 */
692 public static boolean isInvoke(int opcode) {
693 return (flagsArray[opcode & 0xff] & INVOKE) != 0;
694 }
695
696 /**
697 * Determines if a given opcode denotes an instruction that stores a value to a local variable
698 * after popping it from the operand stack.
699 *
700 * @param opcode an opcode to test
701 * @return {@code true} iff {@code opcode} stores a value to a local variable, {@code false}
702 * otherwise
703 */
704 public static boolean isStore(int opcode) {
705 return (flagsArray[opcode & 0xff] & STORE) != 0;
706 }
707
708 /**
709 * Determines if a given opcode is an instruction that delimits a basic block.
710 *
711 * @param opcode an opcode to test
712 * @return {@code true} iff {@code opcode} delimits a basic block
713 */
714 public static boolean isBlockEnd(int opcode) {
715 return (flagsArray[opcode & 0xff] & (STOP | FALL_THROUGH)) != 0;
716 }
717
718 /**
719 * Determines if a given opcode is an instruction that has a 2 or 4 byte operand that is an
720 * offset to another instruction in the same method. This does not include the
721 * {@linkplain #TABLESWITCH switch} instructions.
722 *
723 * @param opcode an opcode to test
724 * @return {@code true} iff {@code opcode} is a branch instruction with a single operand
725 */
726 public static boolean isBranch(int opcode) {
727 return (flagsArray[opcode & 0xff] & BRANCH) != 0;
728 }
729
730 /**
731 * Determines if a given opcode denotes a conditional branch.
732 *
733 * @param opcode
734 * @return {@code true} iff {@code opcode} is a conditional branch
735 */
736 public static boolean isConditionalBranch(int opcode) {
737 return (flagsArray[opcode & 0xff] & FALL_THROUGH) != 0;
738 }
739
740 /**
741 * Gets the arithmetic operator name for a given opcode. If {@code opcode} does not denote an
742 * arithmetic instruction, then the {@linkplain #nameOf(int) name} of the opcode is returned
743 * instead.
744 *
745 * @param op an opcode
746 * @return the arithmetic operator name
747 */
748 public static String operator(int op) {
749 // Checkstyle: stop
750 switch (op) {
751 // arithmetic ops
752 case IADD: // fall through
753 case LADD: // fall through
754 case FADD: // fall through
755 case DADD:
756 return "+";
757 case ISUB: // fall through
758 case LSUB: // fall through
759 case FSUB: // fall through
760 case DSUB:
761 return "-";
762 case IMUL: // fall through
763 case LMUL: // fall through
764 case FMUL: // fall through
765 case DMUL:
766 return "*";
767 case IDIV: // fall through
768 case LDIV: // fall through
769 case FDIV: // fall through
770 case DDIV:
771 return "/";
772 case IREM: // fall through
773 case LREM: // fall through
774 case FREM: // fall through
775 case DREM:
776 return "%";
777 // shift ops
778 case ISHL: // fall through
779 case LSHL:
780 return "<<";
781 case ISHR: // fall through
782 case LSHR:
783 return ">>";
784 case IUSHR: // fall through
785 case LUSHR:
786 return ">>>";
787 // logic ops
788 case IAND: // fall through
789 case LAND:
790 return "&";
791 case IOR: // fall through
792 case LOR:
793 return "|";
794 case IXOR: // fall through
795 case LXOR:
796 return "^";
797 }
798 // Checkstyle: resume
799 return nameOf(op);
800 }
801
802 /**
803 * Defines a bytecode by entering it into the arrays that record its name, length and flags.
804 *
805 * @param name instruction name (should be lower case)
806 * @param format encodes the length of the instruction
807 */
808 private static void def(int opcode, String name, String format, int stackEffect) {
809 def(opcode, name, format, stackEffect, 0);
810 }
811
812 /**
813 * Defines a bytecode by entering it into the arrays that record its name, length and flags.
814 *
815 * @param name instruction name (lower case)
816 * @param format encodes the length of the instruction
817 * @param flags the set of {@link Flags} associated with the instruction
818 */
819 private static void def(int opcode, String name, String format, int stackEffect, int flags) {
820 assert nameArray[opcode] == null : "opcode " + opcode + " is already bound to name " + nameArray[opcode];
821 nameArray[opcode] = name;
822 int instructionLength = format.length();
823 lengthArray[opcode] = instructionLength;
824 stackEffectArray[opcode] = stackEffect;
825 Bytecodes.flagsArray[opcode] = flags;
826
827 assert !isConditionalBranch(opcode) || isBranch(opcode) : "a conditional branch must also be a branch";
828 }
829 }