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
245 public static final int number_of_java_codes = 203;
246
247 // JVM bytecodes
248 public static final int _fast_agetfield = number_of_java_codes;
249 public static final int _fast_bgetfield = 204;
250 public static final int _fast_cgetfield = 205;
251 public static final int _fast_dgetfield = 206;
252 public static final int _fast_fgetfield = 207;
253 public static final int _fast_igetfield = 208;
254 public static final int _fast_lgetfield = 209;
255 public static final int _fast_sgetfield = 210;
256 public static final int _fast_aputfield = 211;
257 public static final int _fast_bputfield = 212;
258 public static final int _fast_zputfield = 213;
259 public static final int _fast_cputfield = 214;
260 public static final int _fast_dputfield = 215;
261 public static final int _fast_fputfield = 216;
262 public static final int _fast_iputfield = 217;
263 public static final int _fast_lputfield = 218;
264 public static final int _fast_sputfield = 219;
265 public static final int _fast_aload_0 = 220;
266 public static final int _fast_iaccess_0 = 221;
267 public static final int _fast_aaccess_0 = 222;
268 public static final int _fast_faccess_0 = 223;
269 public static final int _fast_iload = 224;
270 public static final int _fast_iload2 = 225;
271 public static final int _fast_icaload = 226;
272 public static final int _fast_invokevfinal = 227;
273 public static final int _fast_linearswitch = 228;
274 public static final int _fast_binaryswitch = 229;
275 public static final int _fast_aldc = 230;
276 public static final int _fast_aldc_w = 231;
277 public static final int _return_register_finalizer = 232;
278 public static final int _invokehandle = 233;
279
280 // Bytecodes rewritten at CDS dump time
281 public static final int _nofast_getfield = 234;
282 public static final int _nofast_putfield = 235;
283 public static final int _nofast_aload_0 = 236;
284 public static final int _nofast_iload = 237;
285 public static final int _shouldnotreachhere = 238; // For debugging
286
287 public static final int number_of_codes = 239;
288
289 // Flag bits derived from format strings, can_trap, can_rewrite, etc.:
290 // semantic flags:
291 static final int _bc_can_trap = 1<<0; // bytecode execution can trap or block
292 static final int _bc_can_rewrite = 1<<1; // bytecode execution has an alternate form
293
294 // format bits (determined only by the format string):
295 static final int _fmt_has_c = 1<<2; // constant, such as sipush "bcc"
296 static final int _fmt_has_j = 1<<3; // constant pool cache index, such as getfield "bjj"
297 static final int _fmt_has_k = 1<<4; // constant pool index, such as ldc "bk"
298 static final int _fmt_has_i = 1<<5; // local index, such as iload
299 static final int _fmt_has_o = 1<<6; // offset, such as ifeq
300 static final int _fmt_has_nbo = 1<<7; // contains native-order field(s)
301 static final int _fmt_has_u2 = 1<<8; // contains double-byte field(s)
302 static final int _fmt_has_u4 = 1<<9; // contains quad-byte field
303 static final int _fmt_not_variable = 1<<10; // not of variable length (simple or wide)
304 static final int _fmt_not_simple = 1<<11; // either wide or variable length
305 static final int _all_fmt_bits = (_fmt_not_simple*2 - _fmt_has_c);
306
307 // Example derived format syndromes:
308 static final int _fmt_b = _fmt_not_variable;
309 static final int _fmt_bc = _fmt_b | _fmt_has_c;
310 static final int _fmt_bi = _fmt_b | _fmt_has_i;
311 static final int _fmt_bkk = _fmt_b | _fmt_has_k | _fmt_has_u2;
312 static final int _fmt_bJJ = _fmt_b | _fmt_has_j | _fmt_has_u2 | _fmt_has_nbo;
313 static final int _fmt_bo2 = _fmt_b | _fmt_has_o | _fmt_has_u2;
314 static final int _fmt_bo4 = _fmt_b | _fmt_has_o | _fmt_has_u4;
315
316
317 public static int specialLengthAt(Method method, int bci) {
318 int code = codeAt(method, bci);
319 switch (code) {
320 case _wide:
321 return wideLengthFor(method.getBytecodeOrBPAt(bci + 1));
322 case _tableswitch:
323 {
324 int alignedBCI = Bits.roundTo(bci + 1, jintSize);
325 int lo = method.getBytecodeIntArg(alignedBCI + 1*jintSize);
326 int hi = method.getBytecodeIntArg(alignedBCI + 2*jintSize);
327 return (alignedBCI - bci) + (3 + hi - lo + 1)*jintSize;
328 }
329
330 case _lookupswitch: // fall through
331 case _fast_binaryswitch: // fall through
332 case _fast_linearswitch:
333 {
334 int alignedBCI = Bits.roundTo(bci + 1, jintSize);
335 int npairs = method.getBytecodeIntArg(alignedBCI + jintSize);
336 return (alignedBCI - bci) + (2 + 2*npairs)*jintSize;
337 }
338
339 }
340 throw new RuntimeException("should not reach here");
341 }
342
343 // Conversion
344 public static void check(int code) {
345 if (Assert.ASSERTS_ENABLED) {
346 Assert.that(isDefined(code), "illegal code " + code);
347 }
348 }
349 public static void wideCheck(int code) {
350 if (Assert.ASSERTS_ENABLED) {
351 Assert.that(wideIsDefined(code), "illegal code " + code);
352 }
353 }
354
355 /** Fetches a bytecode, hiding breakpoints as necessary */
356 public static int codeAt(Method method, int bci) {
357 int res = codeOrBPAt(method, bci);
358 if (res == _breakpoint) {
359 res = method.getOrigBytecodeAt(bci);
360 }
361 return res;
362 }
363
364 /** Fetches a bytecode or a breakpoint */
365 public static int codeOrBPAt(Method method, int bci) {
366 return method.getBytecodeOrBPAt(bci);
367 }
368
369 public static boolean isActiveBreakpointAt(Method method, int bci) {
370 return (codeOrBPAt(method, bci) == _breakpoint);
371 }
372
373 // find a bytecode, behind a breakpoint if necessary:
374 // FIXME: not yet implementable
375 // static Code non_breakpoint_code_at(address bcp, Method* method = null);
376
377 // Bytecode attributes
378 public static boolean isDefined (int code) { return 0 <= code && code < number_of_codes && flags(code, false) != 0; }
379 public static boolean wideIsDefined(int code) { return isDefined(code) && flags(code, true) != 0; }
380 public static String name (int code) { check(code); return _name [code]; }
381 public static String format (int code) { check(code); return _format [code]; }
382 public static String wideFormat (int code) { wideCheck(code); return _wide_format [code]; }
383 public static int resultType (int code) { check(code); return _result_type [code]; }
384 public static int depth (int code) { check(code); return _depth [code]; }
385 public static int lengthFor (int code) { check(code); return _lengths [code] & 0xF; }
386 public static int wideLengthFor(int code) { check(code); return _lengths [code] >> 4; }
387 public static boolean canTrap (int code) { check(code); return has_all_flags(code, _bc_can_trap, false); }
388 public static int javaCode (int code) { check(code); return _java_code [code]; }
389 public static boolean canRewrite (int code) { check(code); return has_all_flags(code, _bc_can_rewrite, false); }
390 public static boolean native_byte_order(int code) { check(code); return has_all_flags(code, _fmt_has_nbo, false); }
391 public static boolean uses_cp_cache (int code) { check(code); return has_all_flags(code, _fmt_has_j, false); }
392 public static int lengthAt (Method method, int bci) { int l = lengthFor(codeAt(method, bci)); return l > 0 ? l : specialLengthAt(method, bci); }
393 public static int javaLengthAt (Method method, int bci) { int l = lengthFor(javaCode(codeAt(method, bci))); return l > 0 ? l : specialLengthAt(method, bci); }
394 public static boolean isJavaCode (int code) { return 0 <= code && code < number_of_java_codes; }
395 public static boolean isFastCode (int code) { return number_of_java_codes <= code && code < number_of_codes; }
396
397 public static boolean isAload (int code) { return (code == _aload || code == _aload_0 || code == _aload_1
398 || code == _aload_2 || code == _aload_3); }
399 public static boolean isAstore (int code) { return (code == _astore || code == _astore_0 || code == _astore_1
400 || code == _astore_2 || code == _astore_3); }
401
402 public static boolean isZeroConst (int code) { return (code == _aconst_null || code == _iconst_0
403 || code == _fconst_0 || code == _dconst_0); }
404 public static boolean isFieldCode (int code) { return (_getstatic <= code && code <= _putfield); }
405
406 static int flags (int code, boolean is_wide) {
407 assert code == (code & 0xff) : "must be a byte";
408 return _flags[code + (is_wide ? 256 : 0)];
409 }
410 static int format_bits (int code, boolean is_wide) { return flags(code, is_wide) & _all_fmt_bits; }
411 static boolean has_all_flags (int code, int test_flags, boolean is_wide) {
412 return (flags(code, is_wide) & test_flags) == test_flags;
413 }
414
415 static char compute_flags(String format) {
416 return compute_flags(format, 0);
417 }
418 static char compute_flags(String format, int more_flags) {
419 if (format == null) return 0; // not even more_flags
420 int flags = more_flags;
421 int fp = 0;
422 if (format.length() == 0) {
423 flags |= _fmt_not_simple; // but variable
424 } else {
425 switch (format.charAt(fp)) {
426 case 'b':
427 flags |= _fmt_not_variable; // but simple
428 ++fp; // skip 'b'
429 break;
430 case 'w':
431 flags |= _fmt_not_variable | _fmt_not_simple;
432 ++fp; // skip 'w'
433 assert(format.charAt(fp) == 'b') : "wide format must start with 'wb'";
434 ++fp; // skip 'b'
435 break;
436 }
437 }
438
439 boolean has_nbo = false, has_jbo = false;
440 int has_size = 0;
441 while (fp < format.length()) {
442 int this_flag = 0;
443 char fc = format.charAt(fp++);
444 switch (fc) {
445 case '_': continue; // ignore these
446
447 case 'j': this_flag = _fmt_has_j; has_jbo = true; break;
448 case 'k': this_flag = _fmt_has_k; has_jbo = true; break;
449 case 'i': this_flag = _fmt_has_i; has_jbo = true; break;
450 case 'c': this_flag = _fmt_has_c; has_jbo = true; break;
451 case 'o': this_flag = _fmt_has_o; has_jbo = true; break;
452
453 // uppercase versions mark native byte order (from Rewriter)
454 // actually, only the 'J' case happens currently
455 case 'J': this_flag = _fmt_has_j; has_nbo = true; break;
456 case 'K': this_flag = _fmt_has_k; has_nbo = true; break;
457 case 'I': this_flag = _fmt_has_i; has_nbo = true; break;
458 case 'C': this_flag = _fmt_has_c; has_nbo = true; break;
459 case 'O': this_flag = _fmt_has_o; has_nbo = true; break;
460 default: assert false : "bad char in format";
461 }
462
463 flags |= this_flag;
464
465 assert !(has_jbo && has_nbo) : "mixed byte orders in format";
466 if (has_nbo)
467 flags |= _fmt_has_nbo;
468
469 int this_size = 1;
470 if (fp < format.length() && format.charAt(fp) == fc) {
471 // advance beyond run of the same characters
472 this_size = 2;
473 while (fp + 1 < format.length() && format.charAt(++fp) == fc) this_size++;
474 switch (this_size) {
475 case 2: flags |= _fmt_has_u2; break;
476 case 4: flags |= _fmt_has_u4; break;
477 default: assert false : "bad rep count in format";
478 }
479 }
480 assert has_size == 0 || // no field yet
481 this_size == has_size || // same size
482 this_size < has_size && fp == format.length() : // last field can be short
483 "mixed field sizes in format";
484 has_size = this_size;
485 }
486
487 assert flags == (char)flags : "change _format_flags";
488 return (char)flags;
489 }
490
491
492 //----------------------------------------------------------------------
493 // Internals only below this point
494 //
495
496 private static String[] _name;
497 private static String[] _format;
498 private static String[] _wide_format;
499 private static int[] _result_type;
500 private static byte[] _depth;
501 private static byte[] _lengths;
502 private static int[] _java_code;
503 private static char[] _flags;
504
505 static {
506 _name = new String [number_of_codes];
507 _format = new String [number_of_codes];
508 _wide_format = new String [number_of_codes];
509 _result_type = new int [number_of_codes]; // See BasicType.java
510 _depth = new byte [number_of_codes];
511 _lengths = new byte [number_of_codes];
512 _java_code = new int [number_of_codes];
513 _flags = new char[256 * 2]; // all second page for wide formats
514
515 // In case we want to fetch this information from the VM in the
516 // future
517 VM.registerVMInitializedObserver(new Observer() {
518 public void update(Observable o, Object data) {
519 initialize();
520 }
521 });
522 }
523
524 private static final int jintSize = 4;
525
526 // private static String[] _name = new String [number_of_codes];
527 // private static String[] _format = new String [number_of_codes];
528 // private static String[] _wide_format = new String [number_of_codes];
529 // private static int[] _result_type = new int [number_of_codes]; // See BasicType.java
530 // private static byte[] _depth = new byte [number_of_codes];
531 // private static byte[] _length = new byte [number_of_codes];
532 // private static boolean[] _can_trap = new boolean[number_of_codes];
533 // private static int[] _java_code = new int [number_of_codes];
534 // private static boolean[] _can_rewrite = new boolean[number_of_codes];
535
536 // Initialization
537 private static void initialize() {
538 if (Assert.ASSERTS_ENABLED) {
539 Assert.that(number_of_codes <= 256, "too many bytecodes");
540 }
541
542 // Format strings interpretation:
543 //
544 // b: bytecode
545 // c: signed constant, Java byte-ordering
546 // i: unsigned index , Java byte-ordering
547 // j: unsigned index , native byte-ordering
548 // o: branch offset , Java byte-ordering
549 // _: unused/ignored
550 // w: wide bytecode
551 //
552 // Note: Right now the format strings are used for 2 purposes:
553 // 1. to specify the length of the bytecode
554 // (= number of characters in format string)
555 // 2. to specify the bytecode attributes
556 //
557 // The bytecode attributes are currently used only for bytecode tracing
558 // (see BytecodeTracer); thus if more specific format information is
559 // used, one would also have to adjust the bytecode tracer.
560 //
561 // Note: For bytecodes with variable length, the format string is the empty string.
562
563 // Note 1: null for the format string means the bytecode doesn't exist
564 // in that form.
565 //
566 // Note 2: The result type is T_ILLEGAL for bytecodes where the top of stack
567 // type after execution is not only determined by the bytecode itself.
568
569 // Java bytecodes
570 // bytecode bytecode name format wide f. result tp stk traps
571 def(_nop , "nop" , "b" , null , BasicType.getTVoid() , 0, false);
572 def(_aconst_null , "aconst_null" , "b" , null , BasicType.getTObject() , 1, false);
573 def(_iconst_m1 , "iconst_m1" , "b" , null , BasicType.getTInt() , 1, false);
574 def(_iconst_0 , "iconst_0" , "b" , null , BasicType.getTInt() , 1, false);
575 def(_iconst_1 , "iconst_1" , "b" , null , BasicType.getTInt() , 1, false);
576 def(_iconst_2 , "iconst_2" , "b" , null , BasicType.getTInt() , 1, false);
577 def(_iconst_3 , "iconst_3" , "b" , null , BasicType.getTInt() , 1, false);
578 def(_iconst_4 , "iconst_4" , "b" , null , BasicType.getTInt() , 1, false);
579 def(_iconst_5 , "iconst_5" , "b" , null , BasicType.getTInt() , 1, false);
580 def(_lconst_0 , "lconst_0" , "b" , null , BasicType.getTLong() , 2, false);
581 def(_lconst_1 , "lconst_1" , "b" , null , BasicType.getTLong() , 2, false);
582 def(_fconst_0 , "fconst_0" , "b" , null , BasicType.getTFloat() , 1, false);
583 def(_fconst_1 , "fconst_1" , "b" , null , BasicType.getTFloat() , 1, false);
584 def(_fconst_2 , "fconst_2" , "b" , null , BasicType.getTFloat() , 1, false);
585 def(_dconst_0 , "dconst_0" , "b" , null , BasicType.getTDouble() , 2, false);
586 def(_dconst_1 , "dconst_1" , "b" , null , BasicType.getTDouble() , 2, false);
587 def(_bipush , "bipush" , "bc" , null , BasicType.getTInt() , 1, false);
588 def(_sipush , "sipush" , "bcc" , null , BasicType.getTInt() , 1, false);
589 def(_ldc , "ldc" , "bk" , null , BasicType.getTIllegal(), 1, true );
590 def(_ldc_w , "ldc_w" , "bkk" , null , BasicType.getTIllegal(), 1, true );
591 def(_ldc2_w , "ldc2_w" , "bkk" , null , BasicType.getTIllegal(), 2, true );
592 def(_iload , "iload" , "bi" , "wbii" , BasicType.getTInt() , 1, false);
593 def(_lload , "lload" , "bi" , "wbii" , BasicType.getTLong() , 2, false);
594 def(_fload , "fload" , "bi" , "wbii" , BasicType.getTFloat() , 1, false);
595 def(_dload , "dload" , "bi" , "wbii" , BasicType.getTDouble() , 2, false);
596 def(_aload , "aload" , "bi" , "wbii" , BasicType.getTObject() , 1, false);
597 def(_iload_0 , "iload_0" , "b" , null , BasicType.getTInt() , 1, false);
598 def(_iload_1 , "iload_1" , "b" , null , BasicType.getTInt() , 1, false);
599 def(_iload_2 , "iload_2" , "b" , null , BasicType.getTInt() , 1, false);
600 def(_iload_3 , "iload_3" , "b" , null , BasicType.getTInt() , 1, false);
601 def(_lload_0 , "lload_0" , "b" , null , BasicType.getTLong() , 2, false);
602 def(_lload_1 , "lload_1" , "b" , null , BasicType.getTLong() , 2, false);
603 def(_lload_2 , "lload_2" , "b" , null , BasicType.getTLong() , 2, false);
604 def(_lload_3 , "lload_3" , "b" , null , BasicType.getTLong() , 2, false);
605 def(_fload_0 , "fload_0" , "b" , null , BasicType.getTFloat() , 1, false);
606 def(_fload_1 , "fload_1" , "b" , null , BasicType.getTFloat() , 1, false);
607 def(_fload_2 , "fload_2" , "b" , null , BasicType.getTFloat() , 1, false);
608 def(_fload_3 , "fload_3" , "b" , null , BasicType.getTFloat() , 1, false);
609 def(_dload_0 , "dload_0" , "b" , null , BasicType.getTDouble() , 2, false);
610 def(_dload_1 , "dload_1" , "b" , null , BasicType.getTDouble() , 2, false);
611 def(_dload_2 , "dload_2" , "b" , null , BasicType.getTDouble() , 2, false);
612 def(_dload_3 , "dload_3" , "b" , null , BasicType.getTDouble() , 2, false);
613 def(_aload_0 , "aload_0" , "b" , null , BasicType.getTObject() , 1, true ); // rewriting in interpreter
614 def(_aload_1 , "aload_1" , "b" , null , BasicType.getTObject() , 1, false);
615 def(_aload_2 , "aload_2" , "b" , null , BasicType.getTObject() , 1, false);
616 def(_aload_3 , "aload_3" , "b" , null , BasicType.getTObject() , 1, false);
617 def(_iaload , "iaload" , "b" , null , BasicType.getTInt() , -1, true );
618 def(_laload , "laload" , "b" , null , BasicType.getTLong() , 0, true );
619 def(_faload , "faload" , "b" , null , BasicType.getTFloat() , -1, true );
620 def(_daload , "daload" , "b" , null , BasicType.getTDouble() , 0, true );
621 def(_aaload , "aaload" , "b" , null , BasicType.getTObject() , -1, true );
622 def(_baload , "baload" , "b" , null , BasicType.getTInt() , -1, true );
623 def(_caload , "caload" , "b" , null , BasicType.getTInt() , -1, true );
624 def(_saload , "saload" , "b" , null , BasicType.getTInt() , -1, true );
625 def(_istore , "istore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
626 def(_lstore , "lstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false);
627 def(_fstore , "fstore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
628 def(_dstore , "dstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false);
629 def(_astore , "astore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false);
630 def(_istore_0 , "istore_0" , "b" , null , BasicType.getTVoid() , -1, false);
631 def(_istore_1 , "istore_1" , "b" , null , BasicType.getTVoid() , -1, false);
632 def(_istore_2 , "istore_2" , "b" , null , BasicType.getTVoid() , -1, false);
633 def(_istore_3 , "istore_3" , "b" , null , BasicType.getTVoid() , -1, false);
634 def(_lstore_0 , "lstore_0" , "b" , null , BasicType.getTVoid() , -2, false);
635 def(_lstore_1 , "lstore_1" , "b" , null , BasicType.getTVoid() , -2, false);
636 def(_lstore_2 , "lstore_2" , "b" , null , BasicType.getTVoid() , -2, false);
637 def(_lstore_3 , "lstore_3" , "b" , null , BasicType.getTVoid() , -2, false);
638 def(_fstore_0 , "fstore_0" , "b" , null , BasicType.getTVoid() , -1, false);
639 def(_fstore_1 , "fstore_1" , "b" , null , BasicType.getTVoid() , -1, false);
640 def(_fstore_2 , "fstore_2" , "b" , null , BasicType.getTVoid() , -1, false);
641 def(_fstore_3 , "fstore_3" , "b" , null , BasicType.getTVoid() , -1, false);
642 def(_dstore_0 , "dstore_0" , "b" , null , BasicType.getTVoid() , -2, false);
643 def(_dstore_1 , "dstore_1" , "b" , null , BasicType.getTVoid() , -2, false);
644 def(_dstore_2 , "dstore_2" , "b" , null , BasicType.getTVoid() , -2, false);
645 def(_dstore_3 , "dstore_3" , "b" , null , BasicType.getTVoid() , -2, false);
646 def(_astore_0 , "astore_0" , "b" , null , BasicType.getTVoid() , -1, false);
647 def(_astore_1 , "astore_1" , "b" , null , BasicType.getTVoid() , -1, false);
648 def(_astore_2 , "astore_2" , "b" , null , BasicType.getTVoid() , -1, false);
649 def(_astore_3 , "astore_3" , "b" , null , BasicType.getTVoid() , -1, false);
650 def(_iastore , "iastore" , "b" , null , BasicType.getTVoid() , -3, true );
651 def(_lastore , "lastore" , "b" , null , BasicType.getTVoid() , -4, true );
652 def(_fastore , "fastore" , "b" , null , BasicType.getTVoid() , -3, true );
653 def(_dastore , "dastore" , "b" , null , BasicType.getTVoid() , -4, true );
654 def(_aastore , "aastore" , "b" , null , BasicType.getTVoid() , -3, true );
655 def(_bastore , "bastore" , "b" , null , BasicType.getTVoid() , -3, true );
656 def(_castore , "castore" , "b" , null , BasicType.getTVoid() , -3, true );
657 def(_sastore , "sastore" , "b" , null , BasicType.getTVoid() , -3, true );
658 def(_pop , "pop" , "b" , null , BasicType.getTVoid() , -1, false);
659 def(_pop2 , "pop2" , "b" , null , BasicType.getTVoid() , -2, false);
660 def(_dup , "dup" , "b" , null , BasicType.getTVoid() , 1, false);
661 def(_dup_x1 , "dup_x1" , "b" , null , BasicType.getTVoid() , 1, false);
662 def(_dup_x2 , "dup_x2" , "b" , null , BasicType.getTVoid() , 1, false);
663 def(_dup2 , "dup2" , "b" , null , BasicType.getTVoid() , 2, false);
664 def(_dup2_x1 , "dup2_x1" , "b" , null , BasicType.getTVoid() , 2, false);
665 def(_dup2_x2 , "dup2_x2" , "b" , null , BasicType.getTVoid() , 2, false);
666 def(_swap , "swap" , "b" , null , BasicType.getTVoid() , 0, false);
667 def(_iadd , "iadd" , "b" , null , BasicType.getTInt() , -1, false);
668 def(_ladd , "ladd" , "b" , null , BasicType.getTLong() , -2, false);
669 def(_fadd , "fadd" , "b" , null , BasicType.getTFloat() , -1, false);
670 def(_dadd , "dadd" , "b" , null , BasicType.getTDouble() , -2, false);
671 def(_isub , "isub" , "b" , null , BasicType.getTInt() , -1, false);
672 def(_lsub , "lsub" , "b" , null , BasicType.getTLong() , -2, false);
673 def(_fsub , "fsub" , "b" , null , BasicType.getTFloat() , -1, false);
674 def(_dsub , "dsub" , "b" , null , BasicType.getTDouble() , -2, false);
675 def(_imul , "imul" , "b" , null , BasicType.getTInt() , -1, false);
676 def(_lmul , "lmul" , "b" , null , BasicType.getTLong() , -2, false);
677 def(_fmul , "fmul" , "b" , null , BasicType.getTFloat() , -1, false);
678 def(_dmul , "dmul" , "b" , null , BasicType.getTDouble() , -2, false);
679 def(_idiv , "idiv" , "b" , null , BasicType.getTInt() , -1, true );
680 def(_ldiv , "ldiv" , "b" , null , BasicType.getTLong() , -2, true );
681 def(_fdiv , "fdiv" , "b" , null , BasicType.getTFloat() , -1, false);
682 def(_ddiv , "ddiv" , "b" , null , BasicType.getTDouble() , -2, false);
683 def(_irem , "irem" , "b" , null , BasicType.getTInt() , -1, true );
684 def(_lrem , "lrem" , "b" , null , BasicType.getTLong() , -2, true );
685 def(_frem , "frem" , "b" , null , BasicType.getTFloat() , -1, false);
686 def(_drem , "drem" , "b" , null , BasicType.getTDouble() , -2, false);
687 def(_ineg , "ineg" , "b" , null , BasicType.getTInt() , 0, false);
688 def(_lneg , "lneg" , "b" , null , BasicType.getTLong() , 0, false);
689 def(_fneg , "fneg" , "b" , null , BasicType.getTFloat() , 0, false);
690 def(_dneg , "dneg" , "b" , null , BasicType.getTDouble() , 0, false);
691 def(_ishl , "ishl" , "b" , null , BasicType.getTInt() , -1, false);
692 def(_lshl , "lshl" , "b" , null , BasicType.getTLong() , -1, false);
693 def(_ishr , "ishr" , "b" , null , BasicType.getTInt() , -1, false);
694 def(_lshr , "lshr" , "b" , null , BasicType.getTLong() , -1, false);
695 def(_iushr , "iushr" , "b" , null , BasicType.getTInt() , -1, false);
696 def(_lushr , "lushr" , "b" , null , BasicType.getTLong() , -1, false);
697 def(_iand , "iand" , "b" , null , BasicType.getTInt() , -1, false);
698 def(_land , "land" , "b" , null , BasicType.getTLong() , -2, false);
699 def(_ior , "ior" , "b" , null , BasicType.getTInt() , -1, false);
700 def(_lor , "lor" , "b" , null , BasicType.getTLong() , -2, false);
701 def(_ixor , "ixor" , "b" , null , BasicType.getTInt() , -1, false);
702 def(_lxor , "lxor" , "b" , null , BasicType.getTLong() , -2, false);
703 def(_iinc , "iinc" , "bic" , "wbiicc", BasicType.getTVoid() , 0, false);
704 def(_i2l , "i2l" , "b" , null , BasicType.getTLong() , 1, false);
705 def(_i2f , "i2f" , "b" , null , BasicType.getTFloat() , 0, false);
706 def(_i2d , "i2d" , "b" , null , BasicType.getTDouble() , 1, false);
707 def(_l2i , "l2i" , "b" , null , BasicType.getTInt() , -1, false);
708 def(_l2f , "l2f" , "b" , null , BasicType.getTFloat() , -1, false);
709 def(_l2d , "l2d" , "b" , null , BasicType.getTDouble() , 0, false);
710 def(_f2i , "f2i" , "b" , null , BasicType.getTInt() , 0, false);
711 def(_f2l , "f2l" , "b" , null , BasicType.getTLong() , 1, false);
712 def(_f2d , "f2d" , "b" , null , BasicType.getTDouble() , 1, false);
713 def(_d2i , "d2i" , "b" , null , BasicType.getTInt() , -1, false);
714 def(_d2l , "d2l" , "b" , null , BasicType.getTLong() , 0, false);
715 def(_d2f , "d2f" , "b" , null , BasicType.getTFloat() , -1, false);
716 def(_i2b , "i2b" , "b" , null , BasicType.getTByte() , 0, false);
717 def(_i2c , "i2c" , "b" , null , BasicType.getTChar() , 0, false);
718 def(_i2s , "i2s" , "b" , null , BasicType.getTShort() , 0, false);
719 def(_lcmp , "lcmp" , "b" , null , BasicType.getTVoid() , -3, false);
720 def(_fcmpl , "fcmpl" , "b" , null , BasicType.getTVoid() , -1, false);
721 def(_fcmpg , "fcmpg" , "b" , null , BasicType.getTVoid() , -1, false);
722 def(_dcmpl , "dcmpl" , "b" , null , BasicType.getTVoid() , -3, false);
723 def(_dcmpg , "dcmpg" , "b" , null , BasicType.getTVoid() , -3, false);
724 def(_ifeq , "ifeq" , "boo" , null , BasicType.getTVoid() , -1, false);
725 def(_ifne , "ifne" , "boo" , null , BasicType.getTVoid() , -1, false);
726 def(_iflt , "iflt" , "boo" , null , BasicType.getTVoid() , -1, false);
727 def(_ifge , "ifge" , "boo" , null , BasicType.getTVoid() , -1, false);
728 def(_ifgt , "ifgt" , "boo" , null , BasicType.getTVoid() , -1, false);
729 def(_ifle , "ifle" , "boo" , null , BasicType.getTVoid() , -1, false);
730 def(_if_icmpeq , "if_icmpeq" , "boo" , null , BasicType.getTVoid() , -2, false);
731 def(_if_icmpne , "if_icmpne" , "boo" , null , BasicType.getTVoid() , -2, false);
732 def(_if_icmplt , "if_icmplt" , "boo" , null , BasicType.getTVoid() , -2, false);
733 def(_if_icmpge , "if_icmpge" , "boo" , null , BasicType.getTVoid() , -2, false);
734 def(_if_icmpgt , "if_icmpgt" , "boo" , null , BasicType.getTVoid() , -2, false);
735 def(_if_icmple , "if_icmple" , "boo" , null , BasicType.getTVoid() , -2, false);
736 def(_if_acmpeq , "if_acmpeq" , "boo" , null , BasicType.getTVoid() , -2, false);
737 def(_if_acmpne , "if_acmpne" , "boo" , null , BasicType.getTVoid() , -2, false);
738 def(_goto , "goto" , "boo" , null , BasicType.getTVoid() , 0, false);
739 def(_jsr , "jsr" , "boo" , null , BasicType.getTInt() , 0, false);
740 def(_ret , "ret" , "bi" , "wbii" , BasicType.getTVoid() , 0, false);
741 def(_tableswitch , "tableswitch" , "" , null , BasicType.getTVoid() , -1, false); // may have backward branches
742 def(_lookupswitch , "lookupswitch" , "" , null , BasicType.getTVoid() , -1, false); // rewriting in interpreter
743 def(_ireturn , "ireturn" , "b" , null , BasicType.getTInt() , -1, true );
744 def(_lreturn , "lreturn" , "b" , null , BasicType.getTLong() , -2, true );
745 def(_freturn , "freturn" , "b" , null , BasicType.getTFloat() , -1, true );
746 def(_dreturn , "dreturn" , "b" , null , BasicType.getTDouble() , -2, true );
747 def(_areturn , "areturn" , "b" , null , BasicType.getTObject() , -1, true );
748 def(_return , "return" , "b" , null , BasicType.getTVoid() , 0, true );
749 def(_getstatic , "getstatic" , "bJJ" , null , BasicType.getTIllegal(), 1, true );
750 def(_putstatic , "putstatic" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
751 def(_getfield , "getfield" , "bJJ" , null , BasicType.getTIllegal(), 0, true );
752 def(_putfield , "putfield" , "bJJ" , null , BasicType.getTIllegal(), -2, true );
753 def(_invokevirtual , "invokevirtual" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
754 def(_invokespecial , "invokespecial" , "bJJ" , null , BasicType.getTIllegal(), -1, true );
755 def(_invokestatic , "invokestatic" , "bJJ" , null , BasicType.getTIllegal(), 0, true );
756 def(_invokeinterface , "invokeinterface" , "bJJ__", null , BasicType.getTIllegal(), -1, true );
757 def(_invokedynamic , "invokedynamic" , "bJJJJ", null , BasicType.getTIllegal(), 0, true );
758 def(_new , "new" , "bkk" , null , BasicType.getTObject() , 1, true );
759 def(_newarray , "newarray" , "bc" , null , BasicType.getTObject() , 0, true );
760 def(_anewarray , "anewarray" , "bkk" , null , BasicType.getTObject() , 0, true );
761 def(_arraylength , "arraylength" , "b" , null , BasicType.getTVoid() , 0, true );
762 def(_athrow , "athrow" , "b" , null , BasicType.getTVoid() , -1, true );
763 def(_checkcast , "checkcast" , "bkk" , null , BasicType.getTObject() , 0, true );
764 def(_instanceof , "instanceof" , "bkk" , null , BasicType.getTInt() , 0, true );
765 def(_monitorenter , "monitorenter" , "b" , null , BasicType.getTVoid() , -1, true );
766 def(_monitorexit , "monitorexit" , "b" , null , BasicType.getTVoid() , -1, true );
767 def(_wide , "wide" , "" , null , BasicType.getTVoid() , 0, false);
768 def(_multianewarray , "multianewarray" , "bkkc" , null , BasicType.getTObject() , 1, true );
769 def(_ifnull , "ifnull" , "boo" , null , BasicType.getTVoid() , -1, false);
770 def(_ifnonnull , "ifnonnull" , "boo" , null , BasicType.getTVoid() , -1, false);
771 def(_goto_w , "goto_w" , "boooo", null , BasicType.getTVoid() , 0, false);
772 def(_jsr_w , "jsr_w" , "boooo", null , BasicType.getTInt() , 0, false);
773 def(_breakpoint , "breakpoint" , "" , null , BasicType.getTVoid() , 0, true );
774
775 // JVM bytecodes
776 // bytecode bytecode name format wide f. result tp stk traps std code
777
778 def(_fast_agetfield , "fast_agetfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _getfield );
779 def(_fast_bgetfield , "fast_bgetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield );
780 def(_fast_cgetfield , "fast_cgetfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _getfield );
781 def(_fast_dgetfield , "fast_dgetfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _getfield );
782 def(_fast_fgetfield , "fast_fgetfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _getfield );
783 def(_fast_igetfield , "fast_igetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield );
784 def(_fast_lgetfield , "fast_lgetfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _getfield );
785 def(_fast_sgetfield , "fast_sgetfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _getfield );
786
787 def(_fast_aputfield , "fast_aputfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _putfield );
788 def(_fast_bputfield , "fast_bputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
789 def(_fast_zputfield , "fast_zputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
790 def(_fast_cputfield , "fast_cputfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _putfield );
791 def(_fast_dputfield , "fast_dputfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _putfield );
792 def(_fast_fputfield , "fast_fputfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _putfield );
793 def(_fast_iputfield , "fast_iputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield );
794 def(_fast_lputfield , "fast_lputfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _putfield );
795 def(_fast_sputfield , "fast_sputfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _putfield );
796
797 def(_fast_aload_0 , "fast_aload_0" , "b" , null , BasicType.getTObject() , 1, true , _aload_0 );
798 def(_fast_iaccess_0 , "fast_iaccess_0" , "b_JJ" , null , BasicType.getTInt() , 1, true , _aload_0 );
799 def(_fast_aaccess_0 , "fast_aaccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 );
800 def(_fast_faccess_0 , "fast_faccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 );
801
802 def(_fast_iload , "fast_iload" , "bi" , null , BasicType.getTInt() , 1, false, _iload );
803 def(_fast_iload2 , "fast_iload2" , "bi_i" , null , BasicType.getTInt() , 2, false, _iload );
804 def(_fast_icaload , "fast_icaload" , "bi_" , null , BasicType.getTInt() , 0, false, _iload );
805
806 // Faster method invocation.
807 def(_fast_invokevfinal , "fast_invokevfinal" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual );
808
809 def(_fast_linearswitch , "fast_linearswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch );
810 def(_fast_binaryswitch , "fast_binaryswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch );
811 def(_fast_aldc , "fast_aldc" , "bj" , null , BasicType.getTObject(), 1, true, _ldc );
812 def(_fast_aldc_w , "fast_aldc_w" , "bJJ" , null , BasicType.getTObject(), 1, true, _ldc_w );
813
814 def(_return_register_finalizer, "return_register_finalizer", "b" , null , BasicType.getTVoid() , 0, true, _return );
815
816 // special handling of signature-polymorphic methods
817 def(_invokehandle , "invokehandle" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual );
818
819 // CDS specific. Bytecodes rewritten at CDS dump time
820 def(_nofast_getfield , "_nofast_getfield" , "bJJ" , null , BasicType.getTIllegal() , 0, true, _getfield );
821 def(_nofast_putfield , "_nofast_putfield" , "bJJ" , null , BasicType.getTIllegal() ,-2, true, _putfield );
822 def(_nofast_aload_0 , "_nofast_aload_0" , "b" , null , BasicType.getTObject() , 1, true, _aload_0 );
823 def(_nofast_iload , "_nofast_iload" , "bi" , null , BasicType.getTInt() , 1, false, _iload );
824
825 def(_shouldnotreachhere , "_shouldnotreachhere" , "b" , null , BasicType.getTVoid() , 0, false);
826
827 if (Assert.ASSERTS_ENABLED) {
828 // compare can_trap information for each bytecode with the
829 // can_trap information for the corresponding base bytecode
830 // (if a rewritten bytecode can trap, so must the base bytecode)
831 for (int i = 0; i < number_of_codes; i++) {
832 if (isDefined(i)) {
833 int j = javaCode(i);
834 if (canTrap(i) && !canTrap(j)) {
835 Assert.that(false, name(i) + " can trap => " + name(j) + " can trap, too");
836 }
837 }
838 }
839 }
840 }
841
842 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap) {
843 def(code, name, format, wide_format, result_type, depth, can_trap, code);
844 }
845
846 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap, int java_code) {
847 if (Assert.ASSERTS_ENABLED) {
848 Assert.that(wide_format == null || format != null, "short form must exist if there's a wide form");
849 }
850 int len = (format != null ? format.length() : 0);
851 int wlen = (wide_format != null ? wide_format.length() : 0);
852 _name [code] = name;
853 _result_type [code] = result_type;
854 _depth [code] = (byte) depth;
855 _lengths [code] = (byte)((wlen << 4) | (len & 0xF));
856 _java_code [code] = java_code;
857 _format [code] = format;
858 _wide_format [code] = wide_format;
859 int bc_flags = 0;
860 if (can_trap) bc_flags |= _bc_can_trap;
861 if (java_code != code) bc_flags |= _bc_can_rewrite;
862 _flags[code+0*256] = compute_flags(format, bc_flags);
863 _flags[code+1*256] = compute_flags(wide_format, bc_flags);
864 }
865 }