1 /*
2 * Copyright (c) 2001, 2020, 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 */
24
25 package sun.jvm.hotspot.interpreter;
26
27 import java.util.*;
28 import sun.jvm.hotspot.oops.*;
29 import sun.jvm.hotspot.runtime.*;
30 import sun.jvm.hotspot.utilities.*;
31 import sun.jvm.hotspot.utilities.Observable;
32 import sun.jvm.hotspot.utilities.Observer;
33
34 // Bytecodes specifies all bytecodes used in the VM and
35 // provides utility functions to get bytecode attributes.
36
37 public class Bytecodes {
38 public static final int _illegal = -1;
39
40 // Java bytecodes
41 public static final int _nop = 0; // 0x00
42 public static final int _aconst_null = 1; // 0x01
43 public static final int _iconst_m1 = 2; // 0x02
44 public static final int _iconst_0 = 3; // 0x03
45 public static final int _iconst_1 = 4; // 0x04
46 public static final int _iconst_2 = 5; // 0x05
47 public static final int _iconst_3 = 6; // 0x06
48 public static final int _iconst_4 = 7; // 0x07
49 public static final int _iconst_5 = 8; // 0x08
50 public static final int _lconst_0 = 9; // 0x09
51 public static final int _lconst_1 = 10; // 0x0a
52 public static final int _fconst_0 = 11; // 0x0b
53 public static final int _fconst_1 = 12; // 0x0c
54 public static final int _fconst_2 = 13; // 0x0d
55 public static final int _dconst_0 = 14; // 0x0e
56 public static final int _dconst_1 = 15; // 0x0f
57 public static final int _bipush = 16; // 0x10
58 public static final int _sipush = 17; // 0x11
59 public static final int _ldc = 18; // 0x12
60 public static final int _ldc_w = 19; // 0x13
61 public static final int _ldc2_w = 20; // 0x14
62 public static final int _iload = 21; // 0x15
63 public static final int _lload = 22; // 0x16
64 public static final int _fload = 23; // 0x17
65 public static final int _dload = 24; // 0x18
66 public static final int _aload = 25; // 0x19
67 public static final int _iload_0 = 26; // 0x1a
68 public static final int _iload_1 = 27; // 0x1b
69 public static final int _iload_2 = 28; // 0x1c
70 public static final int _iload_3 = 29; // 0x1d
71 public static final int _lload_0 = 30; // 0x1e
72 public static final int _lload_1 = 31; // 0x1f
73 public static final int _lload_2 = 32; // 0x20
74 public static final int _lload_3 = 33; // 0x21
75 public static final int _fload_0 = 34; // 0x22
76 public static final int _fload_1 = 35; // 0x23
77 public static final int _fload_2 = 36; // 0x24
78 public static final int _fload_3 = 37; // 0x25
79 public static final int _dload_0 = 38; // 0x26
80 public static final int _dload_1 = 39; // 0x27
81 public static final int _dload_2 = 40; // 0x28
82 public static final int _dload_3 = 41; // 0x29
83 public static final int _aload_0 = 42; // 0x2a
84 public static final int _aload_1 = 43; // 0x2b
85 public static final int _aload_2 = 44; // 0x2c
86 public static final int _aload_3 = 45; // 0x2d
87 public static final int _iaload = 46; // 0x2e
88 public static final int _laload = 47; // 0x2f
89 public static final int _faload = 48; // 0x30
90 public static final int _daload = 49; // 0x31
91 public static final int _aaload = 50; // 0x32
92 public static final int _baload = 51; // 0x33
93 public static final int _caload = 52; // 0x34
94 public static final int _saload = 53; // 0x35
95 public static final int _istore = 54; // 0x36
96 public static final int _lstore = 55; // 0x37
97 public static final int _fstore = 56; // 0x38
98 public static final int _dstore = 57; // 0x39
99 public static final int _astore = 58; // 0x3a
100 public static final int _istore_0 = 59; // 0x3b
101 public static final int _istore_1 = 60; // 0x3c
102 public static final int _istore_2 = 61; // 0x3d
103 public static final int _istore_3 = 62; // 0x3e
104 public static final int _lstore_0 = 63; // 0x3f
105 public static final int _lstore_1 = 64; // 0x40
106 public static final int _lstore_2 = 65; // 0x41
107 public static final int _lstore_3 = 66; // 0x42
108 public static final int _fstore_0 = 67; // 0x43
109 public static final int _fstore_1 = 68; // 0x44
110 public static final int _fstore_2 = 69; // 0x45
111 public static final int _fstore_3 = 70; // 0x46
112 public static final int _dstore_0 = 71; // 0x47
113 public static final int _dstore_1 = 72; // 0x48
114 public static final int _dstore_2 = 73; // 0x49
115 public static final int _dstore_3 = 74; // 0x4a
116 public static final int _astore_0 = 75; // 0x4b
117 public static final int _astore_1 = 76; // 0x4c
118 public static final int _astore_2 = 77; // 0x4d
119 public static final int _astore_3 = 78; // 0x4e
120 public static final int _iastore = 79; // 0x4f
121 public static final int _lastore = 80; // 0x50
122 public static final int _fastore = 81; // 0x51
123 public static final int _dastore = 82; // 0x52
124 public static final int _aastore = 83; // 0x53
125 public static final int _bastore = 84; // 0x54
126 public static final int _castore = 85; // 0x55
127 public static final int _sastore = 86; // 0x56
128 public static final int _pop = 87; // 0x57
129 public static final int _pop2 = 88; // 0x58
130 public static final int _dup = 89; // 0x59
131 public static final int _dup_x1 = 90; // 0x5a
132 public static final int _dup_x2 = 91; // 0x5b
133 public static final int _dup2 = 92; // 0x5c
134 public static final int _dup2_x1 = 93; // 0x5d
135 public static final int _dup2_x2 = 94; // 0x5e
136 public static final int _swap = 95; // 0x5f
137 public static final int _iadd = 96; // 0x60
138 public static final int _ladd = 97; // 0x61
139 public static final int _fadd = 98; // 0x62
140 public static final int _dadd = 99; // 0x63
141 public static final int _isub = 100; // 0x64
142 public static final int _lsub = 101; // 0x65
143 public static final int _fsub = 102; // 0x66
144 public static final int _dsub = 103; // 0x67
145 public static final int _imul = 104; // 0x68
146 public static final int _lmul = 105; // 0x69
147 public static final int _fmul = 106; // 0x6a
148 public static final int _dmul = 107; // 0x6b
149 public static final int _idiv = 108; // 0x6c
150 public static final int _ldiv = 109; // 0x6d
151 public static final int _fdiv = 110; // 0x6e
152 public static final int _ddiv = 111; // 0x6f
153 public static final int _irem = 112; // 0x70
154 public static final int _lrem = 113; // 0x71
155 public static final int _frem = 114; // 0x72
156 public static final int _drem = 115; // 0x73
157 public static final int _ineg = 116; // 0x74
158 public static final int _lneg = 117; // 0x75
159 public static final int _fneg = 118; // 0x76
160 public static final int _dneg = 119; // 0x77
161 public static final int _ishl = 120; // 0x78
162 public static final int _lshl = 121; // 0x79
163 public static final int _ishr = 122; // 0x7a
164 public static final int _lshr = 123; // 0x7b
165 public static final int _iushr = 124; // 0x7c
166 public static final int _lushr = 125; // 0x7d
167 public static final int _iand = 126; // 0x7e
168 public static final int _land = 127; // 0x7f
169 public static final int _ior = 128; // 0x80
170 public static final int _lor = 129; // 0x81
171 public static final int _ixor = 130; // 0x82
172 public static final int _lxor = 131; // 0x83
173 public static final int _iinc = 132; // 0x84
174 public static final int _i2l = 133; // 0x85
175 public static final int _i2f = 134; // 0x86
176 public static final int _i2d = 135; // 0x87
177 public static final int _l2i = 136; // 0x88
178 public static final int _l2f = 137; // 0x89
179 public static final int _l2d = 138; // 0x8a
180 public static final int _f2i = 139; // 0x8b
181 public static final int _f2l = 140; // 0x8c
182 public static final int _f2d = 141; // 0x8d
183 public static final int _d2i = 142; // 0x8e
184 public static final int _d2l = 143; // 0x8f
185 public static final int _d2f = 144; // 0x90
186 public static final int _i2b = 145; // 0x91
187 public static final int _i2c = 146; // 0x92
188 public static final int _i2s = 147; // 0x93
189 public static final int _lcmp = 148; // 0x94
190 public static final int _fcmpl = 149; // 0x95
191 public static final int _fcmpg = 150; // 0x96
192 public static final int _dcmpl = 151; // 0x97
193 public static final int _dcmpg = 152; // 0x98
194 public static final int _ifeq = 153; // 0x99
195 public static final int _ifne = 154; // 0x9a
196 public static final int _iflt = 155; // 0x9b
197 public static final int _ifge = 156; // 0x9c
198 public static final int _ifgt = 157; // 0x9d
199 public static final int _ifle = 158; // 0x9e
200 public static final int _if_icmpeq = 159; // 0x9f
201 public static final int _if_icmpne = 160; // 0xa0
202 public static final int _if_icmplt = 161; // 0xa1
203 public static final int _if_icmpge = 162; // 0xa2
204 public static final int _if_icmpgt = 163; // 0xa3
205 public static final int _if_icmple = 164; // 0xa4
206 public static final int _if_acmpeq = 165; // 0xa5
207 public static final int _if_acmpne = 166; // 0xa6
208 public static final int _goto = 167; // 0xa7
209 public static final int _jsr = 168; // 0xa8
210 public static final int _ret = 169; // 0xa9
211 public static final int _tableswitch = 170; // 0xaa
212 public static final int _lookupswitch = 171; // 0xab
213 public static final int _ireturn = 172; // 0xac
214 public static final int _lreturn = 173; // 0xad
215 public static final int _freturn = 174; // 0xae
216 public static final int _dreturn = 175; // 0xaf
217 public static final int _areturn = 176; // 0xb0
218 public static final int _return = 177; // 0xb1
219 public static final int _getstatic = 178; // 0xb2
220 public static final int _putstatic = 179; // 0xb3
221 public static final int _getfield = 180; // 0xb4
222 public static final int _putfield = 181; // 0xb5
223 public static final int _invokevirtual = 182; // 0xb6
224 public static final int _invokespecial = 183; // 0xb7
225 public static final int _invokestatic = 184; // 0xb8
226 public static final int _invokeinterface = 185; // 0xb9
227 public static final int _invokedynamic = 186; // 0xba
228 public static final int _new = 187; // 0xbb
229 public static final int _newarray = 188; // 0xbc
230 public static final int _anewarray = 189; // 0xbd
231 public static final int _arraylength = 190; // 0xbe
232 public static final int _athrow = 191; // 0xbf
233 public static final int _checkcast = 192; // 0xc0
234 public static final int _instanceof = 193; // 0xc1
235 public static final int _monitorenter = 194; // 0xc2
236 public static final int _monitorexit = 195; // 0xc3
237 public static final int _wide = 196; // 0xc4
238 public static final int _multianewarray = 197; // 0xc5
239 public static final int _ifnull = 198; // 0xc6
240 public static final int _ifnonnull = 199; // 0xc7
241 public static final int _goto_w = 200; // 0xc8
242 public static final int _jsr_w = 201; // 0xc9
243 public static final int _breakpoint = 202; // 0xca
244 public static final int _aconst_init = 203; // 0xcb
245 public static final int _withfield = 204; // 0xcc
246
247 public static final int number_of_java_codes = 205;
248
249 // JVM bytecodes
250 public static final int _fast_agetfield = number_of_java_codes;
251 public static final int _fast_qgetfield = 206;
252 public static final int _fast_bgetfield = 207;
253 public static final int _fast_cgetfield = 208;
254 public static final int _fast_dgetfield = 209;
255 public static final int _fast_fgetfield = 210;
256 public static final int _fast_igetfield = 211;
257 public static final int _fast_lgetfield = 212;
258 public static final int _fast_sgetfield = 213;
259 public static final int _fast_aputfield = 214;
260 public static final int _fast_qputfield = 215;
261 public static final int _fast_bputfield = 216;
262 public static final int _fast_zputfield = 217;
263 public static final int _fast_cputfield = 218;
264 public static final int _fast_dputfield = 219;
265 public static final int _fast_fputfield = 220;
266 public static final int _fast_iputfield = 221;
267 public static final int _fast_lputfield = 222;
268 public static final int _fast_sputfield = 223;
269 public static final int _fast_aload_0 = 224;
270 public static final int _fast_iaccess_0 = 225;
271 public static final int _fast_aaccess_0 = 226;
272 public static final int _fast_faccess_0 = 227;
273 public static final int _fast_iload = 228;
274 public static final int _fast_iload2 = 229;
275 public static final int _fast_icaload = 230;
276 public static final int _fast_invokevfinal = 231;
277 public static final int _fast_linearswitch = 232;
278 public static final int _fast_binaryswitch = 233;
279 public static final int _fast_aldc = 234;
280 public static final int _fast_aldc_w = 235;
281 public static final int _return_register_finalizer = 236;
282 public static final int _invokehandle = 237;
283
284 // Bytecodes rewritten at CDS dump time
285 public static final int _nofast_getfield = 238;
286 public static final int _nofast_putfield = 239;
287 public static final int _nofast_aload_0 = 240;
288 public static final int _nofast_iload = 241;
289 public static final int _shouldnotreachhere = 242; // For debugging
290
291 public static final int number_of_codes = 243;
292
293 // Flag bits derived from format strings, can_trap, can_rewrite, etc.:
294 // semantic flags:
295 static final int _bc_can_trap = 1<<0; // bytecode execution can trap or block
296 static final int _bc_can_rewrite = 1<<1; // bytecode execution has an alternate form
297
298 // format bits (determined only by the format string):
299 static final int _fmt_has_c = 1<<2; // constant, such as sipush "bcc"
300 static final int _fmt_has_j = 1<<3; // constant pool cache index, such as getfield "bjj"
301 static final int _fmt_has_k = 1<<4; // constant pool index, such as ldc "bk"
302 static final int _fmt_has_i = 1<<5; // local index, such as iload
303 static final int _fmt_has_o = 1<<6; // offset, such as ifeq
304 static final int _fmt_has_nbo = 1<<7; // contains native-order field(s)
305 static final int _fmt_has_u2 = 1<<8; // contains double-byte field(s)
306 static final int _fmt_has_u4 = 1<<9; // contains quad-byte field
307 static final int _fmt_not_variable = 1<<10; // not of variable length (simple or wide)
308 static final int _fmt_not_simple = 1<<11; // either wide or variable length
309 static final int _all_fmt_bits = (_fmt_not_simple*2 - _fmt_has_c);
310
311 // Example derived format syndromes:
312 static final int _fmt_b = _fmt_not_variable;
313 static final int _fmt_bc = _fmt_b | _fmt_has_c;
314 static final int _fmt_bi = _fmt_b | _fmt_has_i;
315 static final int _fmt_bkk = _fmt_b | _fmt_has_k | _fmt_has_u2;
316 static final int _fmt_bJJ = _fmt_b | _fmt_has_j | _fmt_has_u2 | _fmt_has_nbo;
317 static final int _fmt_bo2 = _fmt_b | _fmt_has_o | _fmt_has_u2;
318 static final int _fmt_bo4 = _fmt_b | _fmt_has_o | _fmt_has_u4;
319
320
321 public static int specialLengthAt(Method method, int bci) {
322 int code = codeAt(method, bci);
323 switch (code) {
324 case _wide:
325 return wideLengthFor(method.getBytecodeOrBPAt(bci + 1));
326 case _tableswitch:
327 {
328 int alignedBCI = Bits.roundTo(bci + 1, jintSize);
329 int lo = method.getBytecodeIntArg(alignedBCI + 1*jintSize);
330 int hi = method.getBytecodeIntArg(alignedBCI + 2*jintSize);
331 return (alignedBCI - bci) + (3 + hi - lo + 1)*jintSize;
332 }
333
334 case _lookupswitch: // fall through
335 case _fast_binaryswitch: // fall through
336 case _fast_linearswitch:
337 {
338 int alignedBCI = Bits.roundTo(bci + 1, jintSize);
339 int npairs = method.getBytecodeIntArg(alignedBCI + jintSize);
340 return (alignedBCI - bci) + (2 + 2*npairs)*jintSize;
341 }
342
343 }
344 throw new RuntimeException("should not reach here");
345 }
346
347 // Conversion
348 public static void check(int code) {
349 if (Assert.ASSERTS_ENABLED) {
350 Assert.that(isDefined(code), "illegal code " + code);
351 }
352 }
353 public static void wideCheck(int code) {
354 if (Assert.ASSERTS_ENABLED) {
355 Assert.that(wideIsDefined(code), "illegal code " + code);
356 }
357 }
358
359 /** Fetches a bytecode, hiding breakpoints as necessary */
360 public static int codeAt(Method method, int bci) {
361 int res = codeOrBPAt(method, bci);
362 if (res == _breakpoint) {
363 res = method.getOrigBytecodeAt(bci);
364 }
365 return res;
366 }
367
368 /** Fetches a bytecode or a breakpoint */
369 public static int codeOrBPAt(Method method, int bci) {
370 return method.getBytecodeOrBPAt(bci);
371 }
372
373 public static boolean isActiveBreakpointAt(Method method, int bci) {
374 return (codeOrBPAt(method, bci) == _breakpoint);
375 }
376
377 // find a bytecode, behind a breakpoint if necessary:
378 // FIXME: not yet implementable
379 // static Code non_breakpoint_code_at(address bcp, Method* method = null);
380
381 // Bytecode attributes
382 public static boolean isDefined (int code) { return 0 <= code && code < number_of_codes && flags(code, false) != 0; }
383 public static boolean wideIsDefined(int code) { return isDefined(code) && flags(code, true) != 0; }
384 public static String name (int code) { check(code); return _name [code]; }
385 public static String format (int code) { check(code); return _format [code]; }
386 public static String wideFormat (int code) { wideCheck(code); return _wide_format [code]; }
387 public static int resultType (int code) { check(code); return _result_type [code]; }
388 public static int depth (int code) { check(code); return _depth [code]; }
389 public static int lengthFor (int code) { check(code); return _lengths [code] & 0xF; }
390 public static int wideLengthFor(int code) { check(code); return _lengths [code] >> 4; }
391 public static boolean canTrap (int code) { check(code); return has_all_flags(code, _bc_can_trap, false); }
392 public static int javaCode (int code) { check(code); return _java_code [code]; }
393 public static boolean canRewrite (int code) { check(code); return has_all_flags(code, _bc_can_rewrite, false); }
394 public static boolean native_byte_order(int code) { check(code); return has_all_flags(code, _fmt_has_nbo, false); }
395 public static boolean uses_cp_cache (int code) { check(code); return has_all_flags(code, _fmt_has_j, false); }
396 public static int lengthAt (Method method, int bci) { int l = lengthFor(codeAt(method, bci)); return l > 0 ? l : specialLengthAt(method, bci); }
397 public static int javaLengthAt (Method method, int bci) { int l = lengthFor(javaCode(codeAt(method, bci))); return l > 0 ? l : specialLengthAt(method, bci); }
398 public static boolean isJavaCode (int code) { return 0 <= code && code < number_of_java_codes; }
399 public static boolean isFastCode (int code) { return number_of_java_codes <= code && code < number_of_codes; }
400
401 public static boolean isAload (int code) { return (code == _aload || code == _aload_0 || code == _aload_1
402 || code == _aload_2 || code == _aload_3); }
403 public static boolean isAstore (int code) { return (code == _astore || code == _astore_0 || code == _astore_1
404 || code == _astore_2 || code == _astore_3); }
405
406 public static boolean isZeroConst (int code) { return (code == _aconst_null || code == _iconst_0
407 || code == _fconst_0 || code == _dconst_0); }
408 public static boolean isFieldCode (int code) { return (_getstatic <= code && code <= _putfield); }
409
410 static int flags (int code, boolean is_wide) {
411 assert code == (code & 0xff) : "must be a byte";
412 return _flags[code + (is_wide ? 256 : 0)];
413 }
414 static int format_bits (int code, boolean is_wide) { return flags(code, is_wide) & _all_fmt_bits; }
415 static boolean has_all_flags (int code, int test_flags, boolean is_wide) {
416 return (flags(code, is_wide) & test_flags) == test_flags;
417 }
418
419 static char compute_flags(String format) {
420 return compute_flags(format, 0);
421 }
422 static char compute_flags(String format, int more_flags) {
423 if (format == null) return 0; // not even more_flags
424 int flags = more_flags;
425 int fp = 0;
426 if (format.length() == 0) {
427 flags |= _fmt_not_simple; // but variable
428 } else {
429 switch (format.charAt(fp)) {
430 case 'b':
431 flags |= _fmt_not_variable; // but simple
432 ++fp; // skip 'b'
433 break;
434 case 'w':
435 flags |= _fmt_not_variable | _fmt_not_simple;
436 ++fp; // skip 'w'
437 assert(format.charAt(fp) == 'b') : "wide format must start with 'wb'";
438 ++fp; // skip 'b'
439 break;
440 }
441 }
442
443 boolean has_nbo = false, has_jbo = false;
444 int has_size = 0;
445 while (fp < format.length()) {
446 int this_flag = 0;
447 char fc = format.charAt(fp++);
448 switch (fc) {
449 case '_': continue; // ignore these
450
451 case 'j': this_flag = _fmt_has_j; has_jbo = true; break;
452 case 'k': this_flag = _fmt_has_k; has_jbo = true; break;
453 case 'i': this_flag = _fmt_has_i; has_jbo = true; break;
454 case 'c': this_flag = _fmt_has_c; has_jbo = true; break;
455 case 'o': this_flag = _fmt_has_o; has_jbo = true; break;
456
457 // uppercase versions mark native byte order (from Rewriter)
458 // actually, only the 'J' case happens currently
459 case 'J': this_flag = _fmt_has_j; has_nbo = true; break;
460 case 'K': this_flag = _fmt_has_k; has_nbo = true; break;
461 case 'I': this_flag = _fmt_has_i; has_nbo = true; break;
462 case 'C': this_flag = _fmt_has_c; has_nbo = true; break;
463 case 'O': this_flag = _fmt_has_o; has_nbo = true; break;
464 default: assert false : "bad char in format";
465 }
466
467 flags |= this_flag;
468
469 assert !(has_jbo && has_nbo) : "mixed byte orders in format";
470 if (has_nbo)
471 flags |= _fmt_has_nbo;
472
473 int this_size = 1;
474 if (fp < format.length() && format.charAt(fp) == fc) {
475 // advance beyond run of the same characters
476 this_size = 2;
477 while (fp + 1 < format.length() && format.charAt(++fp) == fc) this_size++;
478 switch (this_size) {
479 case 2: flags |= _fmt_has_u2; break;
480 case 4: flags |= _fmt_has_u4; break;
481 default: assert false : "bad rep count in format";
482 }
483 }
484 assert has_size == 0 || // no field yet
485 this_size == has_size || // same size
486 this_size < has_size && fp == format.length() : // last field can be short
487 "mixed field sizes in format";
488 has_size = this_size;
489 }
490
491 assert flags == (char)flags : "change _format_flags";
492 return (char)flags;
493 }
494
495
496 //----------------------------------------------------------------------
497 // Internals only below this point
498 //
499
500 private static String[] _name;
501 private static String[] _format;
502 private static String[] _wide_format;
503 private static int[] _result_type;
504 private static byte[] _depth;
505 private static byte[] _lengths;
506 private static int[] _java_code;
507 private static char[] _flags;
508
509 static {
510 _name = new String [number_of_codes];
511 _format = new String [number_of_codes];
512 _wide_format = new String [number_of_codes];
513 _result_type = new int [number_of_codes]; // See BasicType.java
514 _depth = new byte [number_of_codes];
515 _lengths = new byte [number_of_codes];
516 _java_code = new int [number_of_codes];
517 _flags = new char[256 * 2]; // all second page for wide formats
518
519 // In case we want to fetch this information from the VM in the
520 // future
521 VM.registerVMInitializedObserver(new Observer() {
522 public void update(Observable o, Object data) {
523 initialize();
524 }
525 });
526 }
527
528 private static final int jintSize = 4;
529
530 // private static String[] _name = new String [number_of_codes];
531 // private static String[] _format = new String [number_of_codes];
532 // private static String[] _wide_format = new String [number_of_codes];
533 // private static int[] _result_type = new int [number_of_codes]; // See BasicType.java
534 // private static byte[] _depth = new byte [number_of_codes];
535 // private static byte[] _length = new byte [number_of_codes];
536 // private static boolean[] _can_trap = new boolean[number_of_codes];
537 // private static int[] _java_code = new int [number_of_codes];
538 // private static boolean[] _can_rewrite = new boolean[number_of_codes];
539
540 // Initialization
541 private static void initialize() {
542 if (Assert.ASSERTS_ENABLED) {
543 Assert.that(number_of_codes <= 256, "too many bytecodes");
544 }
545
546 // Format strings interpretation:
547 //
548 // b: bytecode
549 // c: signed constant, Java byte-ordering
550 // i: unsigned index , Java byte-ordering
551 // j: unsigned index , native byte-ordering
552 // o: branch offset , Java byte-ordering
553 // _: unused/ignored
554 // w: wide bytecode
555 //
556 // Note: Right now the format strings are used for 2 purposes:
557 // 1. to specify the length of the bytecode
558 // (= number of characters in format string)
559 // 2. to specify the bytecode attributes
560 //
561 // The bytecode attributes are currently used only for bytecode tracing
562 // (see BytecodeTracer); thus if more specific format information is
563 // used, one would also have to adjust the bytecode tracer.
564 //
565 // Note: For bytecodes with variable length, the format string is the empty string.
566
567 // Note 1: null for the format string means the bytecode doesn't exist
568 // in that form.
569 //
570 // Note 2: The result type is T_ILLEGAL for bytecodes where the top of stack
571 // type after execution is not only determined by the bytecode itself.
572
573 // Java bytecodes
574 // bytecode bytecode name format wide f. result tp stk traps
575 def(_nop , "nop" , "b" , null , BasicType.getTVoid() , 0, false);
576 def(_aconst_null , "aconst_null" , "b" , null , BasicType.getTObject() , 1, false);
577 def(_iconst_m1 , "iconst_m1" , "b" , null , BasicType.getTInt() , 1, false);
578 def(_iconst_0 , "iconst_0" , "b" , null , BasicType.getTInt() , 1, false);
579 def(_iconst_1 , "iconst_1" , "b" , null , BasicType.getTInt() , 1, false);
580 def(_iconst_2 , "iconst_2" , "b" , null , BasicType.getTInt() , 1, false);
581 def(_iconst_3 , "iconst_3" , "b" , null , BasicType.getTInt() , 1, false);
582 def(_iconst_4 , "iconst_4" , "b" , null , BasicType.getTInt() , 1, false);
583 def(_iconst_5 , "iconst_5" , "b" , null , BasicType.getTInt() , 1, false);
584 def(_lconst_0 , "lconst_0" , "b" , null , BasicType.getTLong() , 2, false);
585 def(_lconst_1 , "lconst_1" , "b" , null , BasicType.getTLong() , 2, false);
586 def(_fconst_0 , "fconst_0" , "b" , null , BasicType.getTFloat() , 1, false);
587 def(_fconst_1 , "fconst_1" , "b" , null , BasicType.getTFloat() , 1, false);
588 def(_fconst_2 , "fconst_2" , "b" , null , BasicType.getTFloat() , 1, false);
589 def(_dconst_0 , "dconst_0" , "b" , null , BasicType.getTDouble() , 2, false);
590 def(_dconst_1 , "dconst_1" , "b" , null , BasicType.getTDouble() , 2, false);
591 def(_bipush , "bipush" , "bc" , null , BasicType.getTInt() , 1, false);
592 def(_sipush , "sipush" , "bcc" , null , BasicType.getTInt() , 1, false);
593 def(_ldc , "ldc" , "bk" , null , BasicType.getTIllegal(), 1, true );
594 def(_ldc_w , "ldc_w" , "bkk" , null , BasicType.getTIllegal(), 1, true );
595 def(_ldc2_w , "ldc2_w" , "bkk" , null , BasicType.getTIllegal(), 2, true );
596 def(_iload , "iload" , "bi" , "wbii" , BasicType.getTInt() , 1, false);
597 def(_lload , "lload" , "bi" , "wbii" , BasicType.getTLong() , 2, false);
598 def(_fload , "fload" , "bi" , "wbii" , BasicType.getTFloat() , 1, false);
599 def(_dload , "dload" , "bi" , "wbii" , BasicType.getTDouble() , 2, false);
600 def(_aload , "aload" , "bi" , "wbii" , BasicType.getTObject() , 1, false);
601 def(_iload_0 , "iload_0" , "b" , null , BasicType.getTInt() , 1, false);
602 def(_iload_1 , "iload_1" , "b" , null , BasicType.getTInt() , 1, false);
603 def(_iload_2 , "iload_2" , "b" , null , BasicType.getTInt() , 1, false);
604 def(_iload_3 , "iload_3" , "b" , null , BasicType.getTInt() , 1, false);
605 def(_lload_0 , "lload_0" , "b" , null , BasicType.getTLong() , 2, false);
606 def(_lload_1 , "lload_1" , "b" , null , BasicType.getTLong() , 2, false);
607 def(_lload_2 , "lload_2" , "b" , null , BasicType.getTLong() , 2, false);
608 def(_lload_3 , "lload_3" , "b" , null , BasicType.getTLong() , 2, false);
609 def(_fload_0 , "fload_0" , "b" , null , BasicType.getTFloat() , 1, false);
610 def(_fload_1 , "fload_1" , "b" , null , BasicType.getTFloat() , 1, false);
611 def(_fload_2 , "fload_2" , "b" , null , BasicType.getTFloat() , 1, false);
612 def(_fload_3 , "fload_3" , "b" , null , BasicType.getTFloat() , 1, false);
613 def(_dload_0 , "dload_0" , "b" , null , BasicType.getTDouble() , 2, false);
614 def(_dload_1 , "dload_1" , "b" , null , BasicType.getTDouble() , 2, false);
615 def(_dload_2 , "dload_2" , "b" , null , BasicType.getTDouble() , 2, false);
616 def(_dload_3 , "dload_3" , "b" , null , BasicType.getTDouble() , 2, false);
617 def(_aload_0 , "aload_0" , "b" , null , BasicType.getTObject() , 1, true ); // rewriting in interpreter
618 def(_aload_1 , "aload_1" , "b" , null , BasicType.getTObject() , 1, false);
619 def(_aload_2 , "aload_2" , "b" , null , BasicType.getTObject() , 1, false);
620 def(_aload_3 , "aload_3" , "b" , null , BasicType.getTObject() , 1, false);
621 def(_iaload , "iaload" , "b" , null , BasicType.getTInt() , -1, true );
622 def(_laload , "laload" , "b" , null , BasicType.getTLong() , 0, true );
623 def(_faload , "faload" , "b" , null , BasicType.getTFloat() , -1, true );
624 def(_daload , "daload" , "b" , null , BasicType.getTDouble() , 0, true );
625 def(_aaload , "aaload" , "b" , null , BasicType.getTObject() , -1, true );
626 def(_baload , "baload" , "b" , null , BasicType.getTInt() , -1, true );
627 def(_caload , "caload" , "b" , null , BasicType.getTInt() , -1, true );
628 def(_saload , "saload" , "b" , null , BasicType.getTInt() , -1, true );
629 def(_istore , "istore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
630 def(_lstore , "lstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false);
631 def(_fstore , "fstore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
632 def(_dstore , "dstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false);
633 def(_astore , "astore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
634 def(_istore_0 , "istore_0" , "b" , null , BasicType.getTVoid() , -1, false);
635 def(_istore_1 , "istore_1" , "b" , null , BasicType.getTVoid() , -1, false);
636 def(_istore_2 , "istore_2" , "b" , null , BasicType.getTVoid() , -1, false);
637 def(_istore_3 , "istore_3" , "b" , null , BasicType.getTVoid() , -1, false);
638 def(_lstore_0 , "lstore_0" , "b" , null , BasicType.getTVoid() , -2, false);
639 def(_lstore_1 , "lstore_1" , "b" , null , BasicType.getTVoid() , -2, false);
640 def(_lstore_2 , "lstore_2" , "b" , null , BasicType.getTVoid() , -2, false);
641 def(_lstore_3 , "lstore_3" , "b" , null , BasicType.getTVoid() , -2, false);
642 def(_fstore_0 , "fstore_0" , "b" , null , BasicType.getTVoid() , -1, false);
643 def(_fstore_1 , "fstore_1" , "b" , null , BasicType.getTVoid() , -1, false);
644 def(_fstore_2 , "fstore_2" , "b" , null , BasicType.getTVoid() , -1, false);
645 def(_fstore_3 , "fstore_3" , "b" , null , BasicType.getTVoid() , -1, false);
646 def(_dstore_0 , "dstore_0" , "b" , null , BasicType.getTVoid() , -2, false);
647 def(_dstore_1 , "dstore_1" , "b" , null , BasicType.getTVoid() , -2, false);
648 def(_dstore_2 , "dstore_2" , "b" , null , BasicType.getTVoid() , -2, false);
649 def(_dstore_3 , "dstore_3" , "b" , null , BasicType.getTVoid() , -2, false);
650 def(_astore_0 , "astore_0" , "b" , null , BasicType.getTVoid() , -1, false);
651 def(_astore_1 , "astore_1" , "b" , null , BasicType.getTVoid() , -1, false);
652 def(_astore_2 , "astore_2" , "b" , null , BasicType.getTVoid() , -1, false);
653 def(_astore_3 , "astore_3" , "b" , null , BasicType.getTVoid() , -1, false);
654 def(_iastore , "iastore" , "b" , null , BasicType.getTVoid() , -3, true );
655 def(_lastore , "lastore" , "b" , null , BasicType.getTVoid() , -4, true );
656 def(_fastore , "fastore" , "b" , null , BasicType.getTVoid() , -3, true );
657 def(_dastore , "dastore" , "b" , null , BasicType.getTVoid() , -4, true );
658 def(_aastore , "aastore" , "b" , null , BasicType.getTVoid() , -3, true );
659 def(_bastore , "bastore" , "b" , null , BasicType.getTVoid() , -3, true );
660 def(_castore , "castore" , "b" , null , BasicType.getTVoid() , -3, true );
661 def(_sastore , "sastore" , "b" , null , BasicType.getTVoid() , -3, true );
662 def(_pop , "pop" , "b" , null , BasicType.getTVoid() , -1, false);
663 def(_pop2 , "pop2" , "b" , null , BasicType.getTVoid() , -2, false);
664 def(_dup , "dup" , "b" , null , BasicType.getTVoid() , 1, false);
665 def(_dup_x1 , "dup_x1" , "b" , null , BasicType.getTVoid() , 1, false);
666 def(_dup_x2 , "dup_x2" , "b" , null , BasicType.getTVoid() , 1, false);
667 def(_dup2 , "dup2" , "b" , null , BasicType.getTVoid() , 2, false);
668 def(_dup2_x1 , "dup2_x1" , "b" , null , BasicType.getTVoid() , 2, false);
669 def(_dup2_x2 , "dup2_x2" , "b" , null , BasicType.getTVoid() , 2, false);
670 def(_swap , "swap" , "b" , null , BasicType.getTVoid() , 0, false);
671 def(_iadd , "iadd" , "b" , null , BasicType.getTInt() , -1, false);
672 def(_ladd , "ladd" , "b" , null , BasicType.getTLong() , -2, false);
673 def(_fadd , "fadd" , "b" , null , BasicType.getTFloat() , -1, false);
674 def(_dadd , "dadd" , "b" , null , BasicType.getTDouble() , -2, false);
675 def(_isub , "isub" , "b" , null , BasicType.getTInt() , -1, false);
676 def(_lsub , "lsub" , "b" , null , BasicType.getTLong() , -2, false);
677 def(_fsub , "fsub" , "b" , null , BasicType.getTFloat() , -1, false);
678 def(_dsub , "dsub" , "b" , null , BasicType.getTDouble() , -2, false);
679 def(_imul , "imul" , "b" , null , BasicType.getTInt() , -1, false);
680 def(_lmul , "lmul" , "b" , null , BasicType.getTLong() , -2, false);
681 def(_fmul , "fmul" , "b" , null , BasicType.getTFloat() , -1, false);
682 def(_dmul , "dmul" , "b" , null , BasicType.getTDouble() , -2, false);
683 def(_idiv , "idiv" , "b" , null , BasicType.getTInt() , -1, true );
684 def(_ldiv , "ldiv" , "b" , null , BasicType.getTLong() , -2, true );
685 def(_fdiv , "fdiv" , "b" , null , BasicType.getTFloat() , -1, false);
686 def(_ddiv , "ddiv" , "b" , null , BasicType.getTDouble() , -2, false);
687 def(_irem , "irem" , "b" , null , BasicType.getTInt() , -1, true );
688 def(_lrem , "lrem" , "b" , null , BasicType.getTLong() , -2, true );
689 def(_frem , "frem" , "b" , null , BasicType.getTFloat() , -1, false);
690 def(_drem , "drem" , "b" , null , BasicType.getTDouble() , -2, false);
691 def(_ineg , "ineg" , "b" , null , BasicType.getTInt() , 0, false);
692 def(_lneg , "lneg" , "b" , null , BasicType.getTLong() , 0, false);
693 def(_fneg , "fneg" , "b" , null , BasicType.getTFloat() , 0, false);
694 def(_dneg , "dneg" , "b" , null , BasicType.getTDouble() , 0, false);
695 def(_ishl , "ishl" , "b" , null , BasicType.getTInt() , -1, false);
696 def(_lshl , "lshl" , "b" , null , BasicType.getTLong() , -1, false);
697 def(_ishr , "ishr" , "b" , null , BasicType.getTInt() , -1, false);
698 def(_lshr , "lshr" , "b" , null , BasicType.getTLong() , -1, false);
699 def(_iushr , "iushr" , "b" , null , BasicType.getTInt() , -1, false);
700 def(_lushr , "lushr" , "b" , null , BasicType.getTLong() , -1, false);
701 def(_iand , "iand" , "b" , null , BasicType.getTInt() , -1, false);
702 def(_land , "land" , "b" , null , BasicType.getTLong() , -2, false);
703 def(_ior , "ior" , "b" , null , BasicType.getTInt() , -1, false);
704 def(_lor , "lor" , "b" , null , BasicType.getTLong() , -2, false);
705 def(_ixor , "ixor" , "b" , null , BasicType.getTInt() , -1, false);
706 def(_lxor , "lxor" , "b" , null , BasicType.getTLong() , -2, false);
707 def(_iinc , "iinc" , "bic" , "wbiicc", BasicType.getTVoid() , 0, false);
708 def(_i2l , "i2l" , "b" , null , BasicType.getTLong() , 1, false);
709 def(_i2f , "i2f" , "b" , null , BasicType.getTFloat() , 0, false);
710 def(_i2d , "i2d" , "b" , null , BasicType.getTDouble() , 1, false);
711 def(_l2i , "l2i" , "b" , null , BasicType.getTInt() , -1, false);
712 def(_l2f , "l2f" , "b" , null , BasicType.getTFloat() , -1, false);
713 def(_l2d , "l2d" , "b" , null , BasicType.getTDouble() , 0, false);
714 def(_f2i , "f2i" , "b" , null , BasicType.getTInt() , 0, false);
715 def(_f2l , "f2l" , "b" , null , BasicType.getTLong() , 1, false);
716 def(_f2d , "f2d" , "b" , null , BasicType.getTDouble() , 1, false);
717 def(_d2i , "d2i" , "b" , null , BasicType.getTInt() , -1, false);
718 def(_d2l , "d2l" , "b" , null , BasicType.getTLong() , 0, false);
719 def(_d2f , "d2f" , "b" , null , BasicType.getTFloat() , -1, false);
720 def(_i2b , "i2b" , "b" , null , BasicType.getTByte() , 0, false);
721 def(_i2c , "i2c" , "b" , null , BasicType.getTChar() , 0, false);
722 def(_i2s , "i2s" , "b" , null , BasicType.getTShort() , 0, false);
723 def(_lcmp , "lcmp" , "b" , null , BasicType.getTVoid() , -3, false);
724 def(_fcmpl , "fcmpl" , "b" , null , BasicType.getTVoid() , -1, false);
725 def(_fcmpg , "fcmpg" , "b" , null , BasicType.getTVoid() , -1, false);
726 def(_dcmpl , "dcmpl" , "b" , null , BasicType.getTVoid() , -3, false);
727 def(_dcmpg , "dcmpg" , "b" , null , BasicType.getTVoid() , -3, false);
728 def(_ifeq , "ifeq" , "boo" , null , BasicType.getTVoid() , -1, false);
729 def(_ifne , "ifne" , "boo" , null , BasicType.getTVoid() , -1, false);
730 def(_iflt , "iflt" , "boo" , null , BasicType.getTVoid() , -1, false);
731 def(_ifge , "ifge" , "boo" , null , BasicType.getTVoid() , -1, false);
732 def(_ifgt , "ifgt" , "boo" , null , BasicType.getTVoid() , -1, false);
733 def(_ifle , "ifle" , "boo" , null , BasicType.getTVoid() , -1, false);
734 def(_if_icmpeq , "if_icmpeq" , "boo" , null , BasicType.getTVoid() , -2, false);
735 def(_if_icmpne , "if_icmpne" , "boo" , null , BasicType.getTVoid() , -2, false);
736 def(_if_icmplt , "if_icmplt" , "boo" , null , BasicType.getTVoid() , -2, false);
737 def(_if_icmpge , "if_icmpge" , "boo" , null , BasicType.getTVoid() , -2, false);
738 def(_if_icmpgt , "if_icmpgt" , "boo" , null , BasicType.getTVoid() , -2, false);
739 def(_if_icmple , "if_icmple" , "boo" , null , BasicType.getTVoid() , -2, false);
740 def(_if_acmpeq , "if_acmpeq" , "boo" , null , BasicType.getTVoid() , -2, false);
741 def(_if_acmpne , "if_acmpne" , "boo" , null , BasicType.getTVoid() , -2, false);
742 def(_goto , "goto" , "boo" , null , BasicType.getTVoid() , 0, false);
743 def(_jsr , "jsr" , "boo" , null , BasicType.getTInt() , 0, false);
744 def(_ret , "ret" , "bi" , "wbii" , BasicType.getTVoid() , 0, false);
745 def(_tableswitch , "tableswitch" , "" , null , BasicType.getTVoid() , -1, false); // may have backward branches
746 def(_lookupswitch , "lookupswitch" , "" , null , BasicType.getTVoid() , -1, false); // rewriting in interpreter
747 def(_ireturn , "ireturn" , "b" , null , BasicType.getTInt() , -1, true );
748 def(_lreturn , "lreturn" , "b" , null , BasicType.getTLong() , -2, true );
749 def(_freturn , "freturn" , "b" , null , BasicType.getTFloat() , -1, true );
750 def(_dreturn , "dreturn" , "b" , null , BasicType.getTDouble() , -2, true );
751 def(_areturn , "areturn" , "b" , null , BasicType.getTObject() , -1, true );
752 def(_return , "return" , "b" , null , BasicType.getTVoid() , 0, true );
753 def(_getstatic , "getstatic" , "bJJ" , null , BasicType.getTIllegal(), 1, true );
754 def(_putstatic , "putstatic" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
755 def(_getfield , "getfield" , "bJJ" , null , BasicType.getTIllegal(), 0, true );
756 def(_putfield , "putfield" , "bJJ" , null , BasicType.getTIllegal(), -2, true );
757 def(_invokevirtual , "invokevirtual" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
758 def(_invokespecial , "invokespecial" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
759 def(_invokestatic , "invokestatic" , "bJJ" , null , BasicType.getTIllegal(), 0, true );
760 def(_invokeinterface , "invokeinterface" , "bJJ__", null , BasicType.getTIllegal(), -1, true );
761 def(_invokedynamic , "invokedynamic" , "bJJJJ", null , BasicType.getTIllegal(), 0, true );
762 def(_new , "new" , "bkk" , null , BasicType.getTObject() , 1, true );
763 def(_newarray , "newarray" , "bc" , null , BasicType.getTObject() , 0, true );
764 def(_anewarray , "anewarray" , "bkk" , null , BasicType.getTObject() , 0, true );
765 def(_arraylength , "arraylength" , "b" , null , BasicType.getTVoid() , 0, true );
766 def(_athrow , "athrow" , "b" , null , BasicType.getTVoid() , -1, true );
767 def(_checkcast , "checkcast" , "bkk" , null , BasicType.getTObject() , 0, true );
768 def(_instanceof , "instanceof" , "bkk" , null , BasicType.getTInt() , 0, true );
769 def(_monitorenter , "monitorenter" , "b" , null , BasicType.getTVoid() , -1, true );
770 def(_monitorexit , "monitorexit" , "b" , null , BasicType.getTVoid() , -1, true );
771 def(_wide , "wide" , "" , null , BasicType.getTVoid() , 0, false);
772 def(_multianewarray , "multianewarray" , "bkkc" , null , BasicType.getTObject() , 1, true );
773 def(_ifnull , "ifnull" , "boo" , null , BasicType.getTVoid() , -1, false);
774 def(_ifnonnull , "ifnonnull" , "boo" , null , BasicType.getTVoid() , -1, false);
775 def(_goto_w , "goto_w" , "boooo", null , BasicType.getTVoid() , 0, false);
776 def(_jsr_w , "jsr_w" , "boooo", null , BasicType.getTInt() , 0, false);
777 def(_breakpoint , "breakpoint" , "" , null , BasicType.getTVoid() , 0, true );
778
779 // JVM bytecodes
780 // bytecode bytecode name format wide f. result tp stk traps std code
781
782 def(_fast_agetfield , "fast_agetfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _getfield );
783 def(_fast_bgetfield , "fast_bgetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield );
784 def(_fast_cgetfield , "fast_cgetfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _getfield );
785 def(_fast_dgetfield , "fast_dgetfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _getfield );
786 def(_fast_fgetfield , "fast_fgetfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _getfield );
787 def(_fast_igetfield , "fast_igetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield );
788 def(_fast_lgetfield , "fast_lgetfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _getfield );
789 def(_fast_sgetfield , "fast_sgetfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _getfield );
790
791 def(_fast_aputfield , "fast_aputfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _putfield );
792 def(_fast_bputfield , "fast_bputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
793 def(_fast_zputfield , "fast_zputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
794 def(_fast_cputfield , "fast_cputfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _putfield );
795 def(_fast_dputfield , "fast_dputfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _putfield );
796 def(_fast_fputfield , "fast_fputfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _putfield );
797 def(_fast_iputfield , "fast_iputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
798 def(_fast_lputfield , "fast_lputfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _putfield );
799 def(_fast_sputfield , "fast_sputfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _putfield );
800
801 def(_fast_aload_0 , "fast_aload_0" , "b" , null , BasicType.getTObject() , 1, true , _aload_0 );
802 def(_fast_iaccess_0 , "fast_iaccess_0" , "b_JJ" , null , BasicType.getTInt() , 1, true , _aload_0 );
803 def(_fast_aaccess_0 , "fast_aaccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 );
804 def(_fast_faccess_0 , "fast_faccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 );
805
806 def(_fast_iload , "fast_iload" , "bi" , null , BasicType.getTInt() , 1, false, _iload );
807 def(_fast_iload2 , "fast_iload2" , "bi_i" , null , BasicType.getTInt() , 2, false, _iload );
808 def(_fast_icaload , "fast_icaload" , "bi_" , null , BasicType.getTInt() , 0, false, _iload );
809
810 // Faster method invocation.
811 def(_fast_invokevfinal , "fast_invokevfinal" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual );
812
813 def(_fast_linearswitch , "fast_linearswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch );
814 def(_fast_binaryswitch , "fast_binaryswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch );
815 def(_fast_aldc , "fast_aldc" , "bj" , null , BasicType.getTObject(), 1, true, _ldc );
816 def(_fast_aldc_w , "fast_aldc_w" , "bJJ" , null , BasicType.getTObject(), 1, true, _ldc_w );
817
818 def(_return_register_finalizer, "return_register_finalizer", "b" , null , BasicType.getTVoid() , 0, true, _return );
819
820 // special handling of signature-polymorphic methods
821 def(_invokehandle , "invokehandle" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual );
822
823 // CDS specific. Bytecodes rewritten at CDS dump time
824 def(_nofast_getfield , "_nofast_getfield" , "bJJ" , null , BasicType.getTIllegal() , 0, true, _getfield );
825 def(_nofast_putfield , "_nofast_putfield" , "bJJ" , null , BasicType.getTIllegal() ,-2, true, _putfield );
826 def(_nofast_aload_0 , "_nofast_aload_0" , "b" , null , BasicType.getTObject() , 1, true, _aload_0 );
827 def(_nofast_iload , "_nofast_iload" , "bi" , null , BasicType.getTInt() , 1, false, _iload );
828
829 def(_shouldnotreachhere , "_shouldnotreachhere" , "b" , null , BasicType.getTVoid() , 0, false);
830
831 if (Assert.ASSERTS_ENABLED) {
832 // compare can_trap information for each bytecode with the
833 // can_trap information for the corresponding base bytecode
834 // (if a rewritten bytecode can trap, so must the base bytecode)
835 for (int i = 0; i < number_of_codes; i++) {
836 if (isDefined(i)) {
837 int j = javaCode(i);
838 if (canTrap(i) && !canTrap(j)) {
839 Assert.that(false, name(i) + " can trap => " + name(j) + " can trap, too");
840 }
841 }
842 }
843 }
844 }
845
846 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap) {
847 def(code, name, format, wide_format, result_type, depth, can_trap, code);
848 }
849
850 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap, int java_code) {
851 if (Assert.ASSERTS_ENABLED) {
852 Assert.that(wide_format == null || format != null, "short form must exist if there's a wide form");
853 }
854 int len = (format != null ? format.length() : 0);
855 int wlen = (wide_format != null ? wide_format.length() : 0);
856 _name [code] = name;
857 _result_type [code] = result_type;
858 _depth [code] = (byte) depth;
859 _lengths [code] = (byte)((wlen << 4) | (len & 0xF));
860 _java_code [code] = java_code;
861 _format [code] = format;
862 _wide_format [code] = wide_format;
863 int bc_flags = 0;
864 if (can_trap) bc_flags |= _bc_can_trap;
865 if (java_code != code) bc_flags |= _bc_can_rewrite;
866 _flags[code+0*256] = compute_flags(format, bc_flags);
867 _flags[code+1*256] = compute_flags(wide_format, bc_flags);
868 }
869 }