1 /* 2 * Copyright (c) 2001, 2018, 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 32 // Bytecodes specifies all bytecodes used in the VM and 33 // provides utility functions to get bytecode attributes. 34 35 public class Bytecodes { 36 public static final int _illegal = -1; 37 38 // Java bytecodes 39 public static final int _nop = 0; // 0x00 40 public static final int _aconst_null = 1; // 0x01 41 public static final int _iconst_m1 = 2; // 0x02 42 public static final int _iconst_0 = 3; // 0x03 43 public static final int _iconst_1 = 4; // 0x04 44 public static final int _iconst_2 = 5; // 0x05 45 public static final int _iconst_3 = 6; // 0x06 46 public static final int _iconst_4 = 7; // 0x07 47 public static final int _iconst_5 = 8; // 0x08 48 public static final int _lconst_0 = 9; // 0x09 49 public static final int _lconst_1 = 10; // 0x0a 50 public static final int _fconst_0 = 11; // 0x0b 51 public static final int _fconst_1 = 12; // 0x0c 52 public static final int _fconst_2 = 13; // 0x0d 53 public static final int _dconst_0 = 14; // 0x0e 54 public static final int _dconst_1 = 15; // 0x0f 55 public static final int _bipush = 16; // 0x10 56 public static final int _sipush = 17; // 0x11 57 public static final int _ldc = 18; // 0x12 58 public static final int _ldc_w = 19; // 0x13 59 public static final int _ldc2_w = 20; // 0x14 60 public static final int _iload = 21; // 0x15 61 public static final int _lload = 22; // 0x16 62 public static final int _fload = 23; // 0x17 63 public static final int _dload = 24; // 0x18 64 public static final int _aload = 25; // 0x19 65 public static final int _iload_0 = 26; // 0x1a 66 public static final int _iload_1 = 27; // 0x1b 67 public static final int _iload_2 = 28; // 0x1c 68 public static final int _iload_3 = 29; // 0x1d 69 public static final int _lload_0 = 30; // 0x1e 70 public static final int _lload_1 = 31; // 0x1f 71 public static final int _lload_2 = 32; // 0x20 72 public static final int _lload_3 = 33; // 0x21 73 public static final int _fload_0 = 34; // 0x22 74 public static final int _fload_1 = 35; // 0x23 75 public static final int _fload_2 = 36; // 0x24 76 public static final int _fload_3 = 37; // 0x25 77 public static final int _dload_0 = 38; // 0x26 78 public static final int _dload_1 = 39; // 0x27 79 public static final int _dload_2 = 40; // 0x28 80 public static final int _dload_3 = 41; // 0x29 81 public static final int _aload_0 = 42; // 0x2a 82 public static final int _aload_1 = 43; // 0x2b 83 public static final int _aload_2 = 44; // 0x2c 84 public static final int _aload_3 = 45; // 0x2d 85 public static final int _iaload = 46; // 0x2e 86 public static final int _laload = 47; // 0x2f 87 public static final int _faload = 48; // 0x30 88 public static final int _daload = 49; // 0x31 89 public static final int _aaload = 50; // 0x32 90 public static final int _baload = 51; // 0x33 91 public static final int _caload = 52; // 0x34 92 public static final int _saload = 53; // 0x35 93 public static final int _istore = 54; // 0x36 94 public static final int _lstore = 55; // 0x37 95 public static final int _fstore = 56; // 0x38 96 public static final int _dstore = 57; // 0x39 97 public static final int _astore = 58; // 0x3a 98 public static final int _istore_0 = 59; // 0x3b 99 public static final int _istore_1 = 60; // 0x3c 100 public static final int _istore_2 = 61; // 0x3d 101 public static final int _istore_3 = 62; // 0x3e 102 public static final int _lstore_0 = 63; // 0x3f 103 public static final int _lstore_1 = 64; // 0x40 104 public static final int _lstore_2 = 65; // 0x41 105 public static final int _lstore_3 = 66; // 0x42 106 public static final int _fstore_0 = 67; // 0x43 107 public static final int _fstore_1 = 68; // 0x44 108 public static final int _fstore_2 = 69; // 0x45 109 public static final int _fstore_3 = 70; // 0x46 110 public static final int _dstore_0 = 71; // 0x47 111 public static final int _dstore_1 = 72; // 0x48 112 public static final int _dstore_2 = 73; // 0x49 113 public static final int _dstore_3 = 74; // 0x4a 114 public static final int _astore_0 = 75; // 0x4b 115 public static final int _astore_1 = 76; // 0x4c 116 public static final int _astore_2 = 77; // 0x4d 117 public static final int _astore_3 = 78; // 0x4e 118 public static final int _iastore = 79; // 0x4f 119 public static final int _lastore = 80; // 0x50 120 public static final int _fastore = 81; // 0x51 121 public static final int _dastore = 82; // 0x52 122 public static final int _aastore = 83; // 0x53 123 public static final int _bastore = 84; // 0x54 124 public static final int _castore = 85; // 0x55 125 public static final int _sastore = 86; // 0x56 126 public static final int _pop = 87; // 0x57 127 public static final int _pop2 = 88; // 0x58 128 public static final int _dup = 89; // 0x59 129 public static final int _dup_x1 = 90; // 0x5a 130 public static final int _dup_x2 = 91; // 0x5b 131 public static final int _dup2 = 92; // 0x5c 132 public static final int _dup2_x1 = 93; // 0x5d 133 public static final int _dup2_x2 = 94; // 0x5e 134 public static final int _swap = 95; // 0x5f 135 public static final int _iadd = 96; // 0x60 136 public static final int _ladd = 97; // 0x61 137 public static final int _fadd = 98; // 0x62 138 public static final int _dadd = 99; // 0x63 139 public static final int _isub = 100; // 0x64 140 public static final int _lsub = 101; // 0x65 141 public static final int _fsub = 102; // 0x66 142 public static final int _dsub = 103; // 0x67 143 public static final int _imul = 104; // 0x68 144 public static final int _lmul = 105; // 0x69 145 public static final int _fmul = 106; // 0x6a 146 public static final int _dmul = 107; // 0x6b 147 public static final int _idiv = 108; // 0x6c 148 public static final int _ldiv = 109; // 0x6d 149 public static final int _fdiv = 110; // 0x6e 150 public static final int _ddiv = 111; // 0x6f 151 public static final int _irem = 112; // 0x70 152 public static final int _lrem = 113; // 0x71 153 public static final int _frem = 114; // 0x72 154 public static final int _drem = 115; // 0x73 155 public static final int _ineg = 116; // 0x74 156 public static final int _lneg = 117; // 0x75 157 public static final int _fneg = 118; // 0x76 158 public static final int _dneg = 119; // 0x77 159 public static final int _ishl = 120; // 0x78 160 public static final int _lshl = 121; // 0x79 161 public static final int _ishr = 122; // 0x7a 162 public static final int _lshr = 123; // 0x7b 163 public static final int _iushr = 124; // 0x7c 164 public static final int _lushr = 125; // 0x7d 165 public static final int _iand = 126; // 0x7e 166 public static final int _land = 127; // 0x7f 167 public static final int _ior = 128; // 0x80 168 public static final int _lor = 129; // 0x81 169 public static final int _ixor = 130; // 0x82 170 public static final int _lxor = 131; // 0x83 171 public static final int _iinc = 132; // 0x84 172 public static final int _i2l = 133; // 0x85 173 public static final int _i2f = 134; // 0x86 174 public static final int _i2d = 135; // 0x87 175 public static final int _l2i = 136; // 0x88 176 public static final int _l2f = 137; // 0x89 177 public static final int _l2d = 138; // 0x8a 178 public static final int _f2i = 139; // 0x8b 179 public static final int _f2l = 140; // 0x8c 180 public static final int _f2d = 141; // 0x8d 181 public static final int _d2i = 142; // 0x8e 182 public static final int _d2l = 143; // 0x8f 183 public static final int _d2f = 144; // 0x90 184 public static final int _i2b = 145; // 0x91 185 public static final int _i2c = 146; // 0x92 186 public static final int _i2s = 147; // 0x93 187 public static final int _lcmp = 148; // 0x94 188 public static final int _fcmpl = 149; // 0x95 189 public static final int _fcmpg = 150; // 0x96 190 public static final int _dcmpl = 151; // 0x97 191 public static final int _dcmpg = 152; // 0x98 192 public static final int _ifeq = 153; // 0x99 193 public static final int _ifne = 154; // 0x9a 194 public static final int _iflt = 155; // 0x9b 195 public static final int _ifge = 156; // 0x9c 196 public static final int _ifgt = 157; // 0x9d 197 public static final int _ifle = 158; // 0x9e 198 public static final int _if_icmpeq = 159; // 0x9f 199 public static final int _if_icmpne = 160; // 0xa0 200 public static final int _if_icmplt = 161; // 0xa1 201 public static final int _if_icmpge = 162; // 0xa2 202 public static final int _if_icmpgt = 163; // 0xa3 203 public static final int _if_icmple = 164; // 0xa4 204 public static final int _if_acmpeq = 165; // 0xa5 205 public static final int _if_acmpne = 166; // 0xa6 206 public static final int _goto = 167; // 0xa7 207 public static final int _jsr = 168; // 0xa8 208 public static final int _ret = 169; // 0xa9 209 public static final int _tableswitch = 170; // 0xaa 210 public static final int _lookupswitch = 171; // 0xab 211 public static final int _ireturn = 172; // 0xac 212 public static final int _lreturn = 173; // 0xad 213 public static final int _freturn = 174; // 0xae 214 public static final int _dreturn = 175; // 0xaf 215 public static final int _areturn = 176; // 0xb0 216 public static final int _return = 177; // 0xb1 217 public static final int _getstatic = 178; // 0xb2 218 public static final int _putstatic = 179; // 0xb3 219 public static final int _getfield = 180; // 0xb4 220 public static final int _putfield = 181; // 0xb5 221 public static final int _invokevirtual = 182; // 0xb6 222 public static final int _invokespecial = 183; // 0xb7 223 public static final int _invokestatic = 184; // 0xb8 224 public static final int _invokeinterface = 185; // 0xb9 225 public static final int _invokedynamic = 186; // 0xba 226 public static final int _new = 187; // 0xbb 227 public static final int _newarray = 188; // 0xbc 228 public static final int _anewarray = 189; // 0xbd 229 public static final int _arraylength = 190; // 0xbe 230 public static final int _athrow = 191; // 0xbf 231 public static final int _checkcast = 192; // 0xc0 232 public static final int _instanceof = 193; // 0xc1 233 public static final int _monitorenter = 194; // 0xc2 234 public static final int _monitorexit = 195; // 0xc3 235 public static final int _wide = 196; // 0xc4 236 public static final int _multianewarray = 197; // 0xc5 237 public static final int _ifnull = 198; // 0xc6 238 public static final int _ifnonnull = 199; // 0xc7 239 public static final int _goto_w = 200; // 0xc8 240 public static final int _jsr_w = 201; // 0xc9 241 public static final int _breakpoint = 202; // 0xca 242 243 public static final int number_of_java_codes = 203; 244 245 // JVM bytecodes 246 public static final int _fast_agetfield = number_of_java_codes; 247 public static final int _fast_bgetfield = 204; 248 public static final int _fast_cgetfield = 205; 249 public static final int _fast_dgetfield = 206; 250 public static final int _fast_fgetfield = 207; 251 public static final int _fast_igetfield = 208; 252 public static final int _fast_lgetfield = 209; 253 public static final int _fast_sgetfield = 210; 254 public static final int _fast_aputfield = 211; 255 public static final int _fast_bputfield = 212; 256 public static final int _fast_zputfield = 213; 257 public static final int _fast_cputfield = 214; 258 public static final int _fast_dputfield = 215; 259 public static final int _fast_fputfield = 216; 260 public static final int _fast_iputfield = 217; 261 public static final int _fast_lputfield = 218; 262 public static final int _fast_sputfield = 219; 263 public static final int _fast_aload_0 = 220; 264 public static final int _fast_iaccess_0 = 221; 265 public static final int _fast_aaccess_0 = 222; 266 public static final int _fast_faccess_0 = 223; 267 public static final int _fast_iload = 224; 268 public static final int _fast_iload2 = 225; 269 public static final int _fast_icaload = 226; 270 public static final int _fast_invokevfinal = 227; 271 public static final int _fast_linearswitch = 228; 272 public static final int _fast_binaryswitch = 229; 273 public static final int _fast_aldc = 230; 274 public static final int _fast_aldc_w = 231; 275 public static final int _return_register_finalizer = 232; 276 public static final int _invokehandle = 233; 277 278 // Bytecodes rewritten at CDS dump time 279 public static final int _nofast_getfield = 234; 280 public static final int _nofast_putfield = 235; 281 public static final int _nofast_aload_0 = 236; 282 public static final int _nofast_iload = 237; 283 public static final int _shouldnotreachhere = 238; // For debugging 284 285 public static final int number_of_codes = 239; 286 287 // Flag bits derived from format strings, can_trap, can_rewrite, etc.: 288 // semantic flags: 289 static final int _bc_can_trap = 1<<0; // bytecode execution can trap or block 290 static final int _bc_can_rewrite = 1<<1; // bytecode execution has an alternate form 291 292 // format bits (determined only by the format string): 293 static final int _fmt_has_c = 1<<2; // constant, such as sipush "bcc" 294 static final int _fmt_has_j = 1<<3; // constant pool cache index, such as getfield "bjj" 295 static final int _fmt_has_k = 1<<4; // constant pool index, such as ldc "bk" 296 static final int _fmt_has_i = 1<<5; // local index, such as iload 297 static final int _fmt_has_o = 1<<6; // offset, such as ifeq 298 static final int _fmt_has_nbo = 1<<7; // contains native-order field(s) 299 static final int _fmt_has_u2 = 1<<8; // contains double-byte field(s) 300 static final int _fmt_has_u4 = 1<<9; // contains quad-byte field 301 static final int _fmt_not_variable = 1<<10; // not of variable length (simple or wide) 302 static final int _fmt_not_simple = 1<<11; // either wide or variable length 303 static final int _all_fmt_bits = (_fmt_not_simple*2 - _fmt_has_c); 304 305 // Example derived format syndromes: 306 static final int _fmt_b = _fmt_not_variable; 307 static final int _fmt_bc = _fmt_b | _fmt_has_c; 308 static final int _fmt_bi = _fmt_b | _fmt_has_i; 309 static final int _fmt_bkk = _fmt_b | _fmt_has_k | _fmt_has_u2; 310 static final int _fmt_bJJ = _fmt_b | _fmt_has_j | _fmt_has_u2 | _fmt_has_nbo; 311 static final int _fmt_bo2 = _fmt_b | _fmt_has_o | _fmt_has_u2; 312 static final int _fmt_bo4 = _fmt_b | _fmt_has_o | _fmt_has_u4; 313 314 specialLengthAt(Method method, int bci)315 public static int specialLengthAt(Method method, int bci) { 316 int code = codeAt(method, bci); 317 switch (code) { 318 case _wide: 319 return wideLengthFor(method.getBytecodeOrBPAt(bci + 1)); 320 case _tableswitch: 321 { 322 int alignedBCI = Bits.roundTo(bci + 1, jintSize); 323 int lo = method.getBytecodeIntArg(alignedBCI + 1*jintSize); 324 int hi = method.getBytecodeIntArg(alignedBCI + 2*jintSize); 325 return (alignedBCI - bci) + (3 + hi - lo + 1)*jintSize; 326 } 327 328 case _lookupswitch: // fall through 329 case _fast_binaryswitch: // fall through 330 case _fast_linearswitch: 331 { 332 int alignedBCI = Bits.roundTo(bci + 1, jintSize); 333 int npairs = method.getBytecodeIntArg(alignedBCI + jintSize); 334 return (alignedBCI - bci) + (2 + 2*npairs)*jintSize; 335 } 336 337 } 338 throw new RuntimeException("should not reach here"); 339 } 340 341 // Conversion check(int code)342 public static void check(int code) { 343 if (Assert.ASSERTS_ENABLED) { 344 Assert.that(isDefined(code), "illegal code " + code); 345 } 346 } wideCheck(int code)347 public static void wideCheck(int code) { 348 if (Assert.ASSERTS_ENABLED) { 349 Assert.that(wideIsDefined(code), "illegal code " + code); 350 } 351 } 352 353 /** Fetches a bytecode, hiding breakpoints as necessary */ codeAt(Method method, int bci)354 public static int codeAt(Method method, int bci) { 355 int res = codeOrBPAt(method, bci); 356 if (res == _breakpoint) { 357 res = method.getOrigBytecodeAt(bci); 358 } 359 return res; 360 } 361 362 /** Fetches a bytecode or a breakpoint */ codeOrBPAt(Method method, int bci)363 public static int codeOrBPAt(Method method, int bci) { 364 return method.getBytecodeOrBPAt(bci); 365 } 366 isActiveBreakpointAt(Method method, int bci)367 public static boolean isActiveBreakpointAt(Method method, int bci) { 368 return (codeOrBPAt(method, bci) == _breakpoint); 369 } 370 371 // find a bytecode, behind a breakpoint if necessary: 372 // FIXME: not yet implementable 373 // static Code non_breakpoint_code_at(address bcp, Method* method = null); 374 375 // Bytecode attributes isDefined(int code)376 public static boolean isDefined (int code) { return 0 <= code && code < number_of_codes && flags(code, false) != 0; } wideIsDefined(int code)377 public static boolean wideIsDefined(int code) { return isDefined(code) && flags(code, true) != 0; } name(int code)378 public static String name (int code) { check(code); return _name [code]; } format(int code)379 public static String format (int code) { check(code); return _format [code]; } wideFormat(int code)380 public static String wideFormat (int code) { wideCheck(code); return _wide_format [code]; } resultType(int code)381 public static int resultType (int code) { check(code); return _result_type [code]; } depth(int code)382 public static int depth (int code) { check(code); return _depth [code]; } lengthFor(int code)383 public static int lengthFor (int code) { check(code); return _lengths [code] & 0xF; } wideLengthFor(int code)384 public static int wideLengthFor(int code) { check(code); return _lengths [code] >> 4; } canTrap(int code)385 public static boolean canTrap (int code) { check(code); return has_all_flags(code, _bc_can_trap, false); } javaCode(int code)386 public static int javaCode (int code) { check(code); return _java_code [code]; } canRewrite(int code)387 public static boolean canRewrite (int code) { check(code); return has_all_flags(code, _bc_can_rewrite, false); } native_byte_order(int code)388 public static boolean native_byte_order(int code) { check(code); return has_all_flags(code, _fmt_has_nbo, false); } uses_cp_cache(int code)389 public static boolean uses_cp_cache (int code) { check(code); return has_all_flags(code, _fmt_has_j, false); } lengthAt(Method method, int bci)390 public static int lengthAt (Method method, int bci) { int l = lengthFor(codeAt(method, bci)); return l > 0 ? l : specialLengthAt(method, bci); } javaLengthAt(Method method, int bci)391 public static int javaLengthAt (Method method, int bci) { int l = lengthFor(javaCode(codeAt(method, bci))); return l > 0 ? l : specialLengthAt(method, bci); } isJavaCode(int code)392 public static boolean isJavaCode (int code) { return 0 <= code && code < number_of_java_codes; } isFastCode(int code)393 public static boolean isFastCode (int code) { return number_of_java_codes <= code && code < number_of_codes; } 394 isAload(int code)395 public static boolean isAload (int code) { return (code == _aload || code == _aload_0 || code == _aload_1 396 || code == _aload_2 || code == _aload_3); } isAstore(int code)397 public static boolean isAstore (int code) { return (code == _astore || code == _astore_0 || code == _astore_1 398 || code == _astore_2 || code == _astore_3); } 399 isZeroConst(int code)400 public static boolean isZeroConst (int code) { return (code == _aconst_null || code == _iconst_0 401 || code == _fconst_0 || code == _dconst_0); } 402 flags(int code, boolean is_wide)403 static int flags (int code, boolean is_wide) { 404 assert code == (code & 0xff) : "must be a byte"; 405 return _flags[code + (is_wide ? 256 : 0)]; 406 } format_bits(int code, boolean is_wide)407 static int format_bits (int code, boolean is_wide) { return flags(code, is_wide) & _all_fmt_bits; } has_all_flags(int code, int test_flags, boolean is_wide)408 static boolean has_all_flags (int code, int test_flags, boolean is_wide) { 409 return (flags(code, is_wide) & test_flags) == test_flags; 410 } 411 compute_flags(String format)412 static char compute_flags(String format) { 413 return compute_flags(format, 0); 414 } compute_flags(String format, int more_flags)415 static char compute_flags(String format, int more_flags) { 416 if (format == null) return 0; // not even more_flags 417 int flags = more_flags; 418 int fp = 0; 419 if (format.length() == 0) { 420 flags |= _fmt_not_simple; // but variable 421 } else { 422 switch (format.charAt(fp)) { 423 case 'b': 424 flags |= _fmt_not_variable; // but simple 425 ++fp; // skip 'b' 426 break; 427 case 'w': 428 flags |= _fmt_not_variable | _fmt_not_simple; 429 ++fp; // skip 'w' 430 assert(format.charAt(fp) == 'b') : "wide format must start with 'wb'"; 431 ++fp; // skip 'b' 432 break; 433 } 434 } 435 436 boolean has_nbo = false, has_jbo = false; 437 int has_size = 0; 438 while (fp < format.length()) { 439 int this_flag = 0; 440 char fc = format.charAt(fp++); 441 switch (fc) { 442 case '_': continue; // ignore these 443 444 case 'j': this_flag = _fmt_has_j; has_jbo = true; break; 445 case 'k': this_flag = _fmt_has_k; has_jbo = true; break; 446 case 'i': this_flag = _fmt_has_i; has_jbo = true; break; 447 case 'c': this_flag = _fmt_has_c; has_jbo = true; break; 448 case 'o': this_flag = _fmt_has_o; has_jbo = true; break; 449 450 // uppercase versions mark native byte order (from Rewriter) 451 // actually, only the 'J' case happens currently 452 case 'J': this_flag = _fmt_has_j; has_nbo = true; break; 453 case 'K': this_flag = _fmt_has_k; has_nbo = true; break; 454 case 'I': this_flag = _fmt_has_i; has_nbo = true; break; 455 case 'C': this_flag = _fmt_has_c; has_nbo = true; break; 456 case 'O': this_flag = _fmt_has_o; has_nbo = true; break; 457 default: assert false : "bad char in format"; 458 } 459 460 flags |= this_flag; 461 462 assert !(has_jbo && has_nbo) : "mixed byte orders in format"; 463 if (has_nbo) 464 flags |= _fmt_has_nbo; 465 466 int this_size = 1; 467 if (fp < format.length() && format.charAt(fp) == fc) { 468 // advance beyond run of the same characters 469 this_size = 2; 470 while (fp + 1 < format.length() && format.charAt(++fp) == fc) this_size++; 471 switch (this_size) { 472 case 2: flags |= _fmt_has_u2; break; 473 case 4: flags |= _fmt_has_u4; break; 474 default: assert false : "bad rep count in format"; 475 } 476 } 477 assert has_size == 0 || // no field yet 478 this_size == has_size || // same size 479 this_size < has_size && fp == format.length() : // last field can be short 480 "mixed field sizes in format"; 481 has_size = this_size; 482 } 483 484 assert flags == (char)flags : "change _format_flags"; 485 return (char)flags; 486 } 487 488 489 //---------------------------------------------------------------------- 490 // Internals only below this point 491 // 492 493 private static String[] _name; 494 private static String[] _format; 495 private static String[] _wide_format; 496 private static int[] _result_type; 497 private static byte[] _depth; 498 private static byte[] _lengths; 499 private static int[] _java_code; 500 private static char[] _flags; 501 502 static { 503 _name = new String [number_of_codes]; 504 _format = new String [number_of_codes]; 505 _wide_format = new String [number_of_codes]; 506 _result_type = new int [number_of_codes]; // See BasicType.java 507 _depth = new byte [number_of_codes]; 508 _lengths = new byte [number_of_codes]; 509 _java_code = new int [number_of_codes]; 510 _flags = new char[256 * 2]; // all second page for wide formats 511 512 // In case we want to fetch this information from the VM in the 513 // future 514 VM.registerVMInitializedObserver(new Observer() { 515 public void update(Observable o, Object data) { 516 initialize(); 517 } 518 }); 519 } 520 521 private static final int jintSize = 4; 522 523 // private static String[] _name = new String [number_of_codes]; 524 // private static String[] _format = new String [number_of_codes]; 525 // private static String[] _wide_format = new String [number_of_codes]; 526 // private static int[] _result_type = new int [number_of_codes]; // See BasicType.java 527 // private static byte[] _depth = new byte [number_of_codes]; 528 // private static byte[] _length = new byte [number_of_codes]; 529 // private static boolean[] _can_trap = new boolean[number_of_codes]; 530 // private static int[] _java_code = new int [number_of_codes]; 531 // private static boolean[] _can_rewrite = new boolean[number_of_codes]; 532 533 // Initialization 534 private static void initialize() { 535 if (Assert.ASSERTS_ENABLED) { 536 Assert.that(number_of_codes <= 256, "too many bytecodes"); 537 } 538 539 // Format strings interpretation: 540 // 541 // b: bytecode 542 // c: signed constant, Java byte-ordering 543 // i: unsigned index , Java byte-ordering 544 // j: unsigned index , native byte-ordering 545 // o: branch offset , Java byte-ordering 546 // _: unused/ignored 547 // w: wide bytecode 548 // 549 // Note: Right now the format strings are used for 2 purposes: 550 // 1. to specify the length of the bytecode 551 // (= number of characters in format string) 552 // 2. to specify the bytecode attributes 553 // 554 // The bytecode attributes are currently used only for bytecode tracing 555 // (see BytecodeTracer); thus if more specific format information is 556 // used, one would also have to adjust the bytecode tracer. 557 // 558 // Note: For bytecodes with variable length, the format string is the empty string. 559 560 // Note 1: null for the format string means the bytecode doesn't exist 561 // in that form. 562 // 563 // Note 2: The result type is T_ILLEGAL for bytecodes where the top of stack 564 // type after execution is not only determined by the bytecode itself. 565 566 // Java bytecodes 567 // bytecode bytecode name format wide f. result tp stk traps 568 def(_nop , "nop" , "b" , null , BasicType.getTVoid() , 0, false); 569 def(_aconst_null , "aconst_null" , "b" , null , BasicType.getTObject() , 1, false); 570 def(_iconst_m1 , "iconst_m1" , "b" , null , BasicType.getTInt() , 1, false); 571 def(_iconst_0 , "iconst_0" , "b" , null , BasicType.getTInt() , 1, false); 572 def(_iconst_1 , "iconst_1" , "b" , null , BasicType.getTInt() , 1, false); 573 def(_iconst_2 , "iconst_2" , "b" , null , BasicType.getTInt() , 1, false); 574 def(_iconst_3 , "iconst_3" , "b" , null , BasicType.getTInt() , 1, false); 575 def(_iconst_4 , "iconst_4" , "b" , null , BasicType.getTInt() , 1, false); 576 def(_iconst_5 , "iconst_5" , "b" , null , BasicType.getTInt() , 1, false); 577 def(_lconst_0 , "lconst_0" , "b" , null , BasicType.getTLong() , 2, false); 578 def(_lconst_1 , "lconst_1" , "b" , null , BasicType.getTLong() , 2, false); 579 def(_fconst_0 , "fconst_0" , "b" , null , BasicType.getTFloat() , 1, false); 580 def(_fconst_1 , "fconst_1" , "b" , null , BasicType.getTFloat() , 1, false); 581 def(_fconst_2 , "fconst_2" , "b" , null , BasicType.getTFloat() , 1, false); 582 def(_dconst_0 , "dconst_0" , "b" , null , BasicType.getTDouble() , 2, false); 583 def(_dconst_1 , "dconst_1" , "b" , null , BasicType.getTDouble() , 2, false); 584 def(_bipush , "bipush" , "bc" , null , BasicType.getTInt() , 1, false); 585 def(_sipush , "sipush" , "bcc" , null , BasicType.getTInt() , 1, false); 586 def(_ldc , "ldc" , "bk" , null , BasicType.getTIllegal(), 1, true ); 587 def(_ldc_w , "ldc_w" , "bkk" , null , BasicType.getTIllegal(), 1, true ); 588 def(_ldc2_w , "ldc2_w" , "bkk" , null , BasicType.getTIllegal(), 2, true ); 589 def(_iload , "iload" , "bi" , "wbii" , BasicType.getTInt() , 1, false); 590 def(_lload , "lload" , "bi" , "wbii" , BasicType.getTLong() , 2, false); 591 def(_fload , "fload" , "bi" , "wbii" , BasicType.getTFloat() , 1, false); 592 def(_dload , "dload" , "bi" , "wbii" , BasicType.getTDouble() , 2, false); 593 def(_aload , "aload" , "bi" , "wbii" , BasicType.getTObject() , 1, false); 594 def(_iload_0 , "iload_0" , "b" , null , BasicType.getTInt() , 1, false); 595 def(_iload_1 , "iload_1" , "b" , null , BasicType.getTInt() , 1, false); 596 def(_iload_2 , "iload_2" , "b" , null , BasicType.getTInt() , 1, false); 597 def(_iload_3 , "iload_3" , "b" , null , BasicType.getTInt() , 1, false); 598 def(_lload_0 , "lload_0" , "b" , null , BasicType.getTLong() , 2, false); 599 def(_lload_1 , "lload_1" , "b" , null , BasicType.getTLong() , 2, false); 600 def(_lload_2 , "lload_2" , "b" , null , BasicType.getTLong() , 2, false); 601 def(_lload_3 , "lload_3" , "b" , null , BasicType.getTLong() , 2, false); 602 def(_fload_0 , "fload_0" , "b" , null , BasicType.getTFloat() , 1, false); 603 def(_fload_1 , "fload_1" , "b" , null , BasicType.getTFloat() , 1, false); 604 def(_fload_2 , "fload_2" , "b" , null , BasicType.getTFloat() , 1, false); 605 def(_fload_3 , "fload_3" , "b" , null , BasicType.getTFloat() , 1, false); 606 def(_dload_0 , "dload_0" , "b" , null , BasicType.getTDouble() , 2, false); 607 def(_dload_1 , "dload_1" , "b" , null , BasicType.getTDouble() , 2, false); 608 def(_dload_2 , "dload_2" , "b" , null , BasicType.getTDouble() , 2, false); 609 def(_dload_3 , "dload_3" , "b" , null , BasicType.getTDouble() , 2, false); 610 def(_aload_0 , "aload_0" , "b" , null , BasicType.getTObject() , 1, true ); // rewriting in interpreter 611 def(_aload_1 , "aload_1" , "b" , null , BasicType.getTObject() , 1, false); 612 def(_aload_2 , "aload_2" , "b" , null , BasicType.getTObject() , 1, false); 613 def(_aload_3 , "aload_3" , "b" , null , BasicType.getTObject() , 1, false); 614 def(_iaload , "iaload" , "b" , null , BasicType.getTInt() , -1, true ); 615 def(_laload , "laload" , "b" , null , BasicType.getTLong() , 0, true ); 616 def(_faload , "faload" , "b" , null , BasicType.getTFloat() , -1, true ); 617 def(_daload , "daload" , "b" , null , BasicType.getTDouble() , 0, true ); 618 def(_aaload , "aaload" , "b" , null , BasicType.getTObject() , -1, true ); 619 def(_baload , "baload" , "b" , null , BasicType.getTInt() , -1, true ); 620 def(_caload , "caload" , "b" , null , BasicType.getTInt() , -1, true ); 621 def(_saload , "saload" , "b" , null , BasicType.getTInt() , -1, true ); 622 def(_istore , "istore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false); 623 def(_lstore , "lstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false); 624 def(_fstore , "fstore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false); 625 def(_dstore , "dstore" , "bi" , "wbii" , BasicType.getTVoid() , -2, false); 626 def(_astore , "astore" , "bi" , "wbii" , BasicType.getTVoid() , -1, false); 627 def(_istore_0 , "istore_0" , "b" , null , BasicType.getTVoid() , -1, false); 628 def(_istore_1 , "istore_1" , "b" , null , BasicType.getTVoid() , -1, false); 629 def(_istore_2 , "istore_2" , "b" , null , BasicType.getTVoid() , -1, false); 630 def(_istore_3 , "istore_3" , "b" , null , BasicType.getTVoid() , -1, false); 631 def(_lstore_0 , "lstore_0" , "b" , null , BasicType.getTVoid() , -2, false); 632 def(_lstore_1 , "lstore_1" , "b" , null , BasicType.getTVoid() , -2, false); 633 def(_lstore_2 , "lstore_2" , "b" , null , BasicType.getTVoid() , -2, false); 634 def(_lstore_3 , "lstore_3" , "b" , null , BasicType.getTVoid() , -2, false); 635 def(_fstore_0 , "fstore_0" , "b" , null , BasicType.getTVoid() , -1, false); 636 def(_fstore_1 , "fstore_1" , "b" , null , BasicType.getTVoid() , -1, false); 637 def(_fstore_2 , "fstore_2" , "b" , null , BasicType.getTVoid() , -1, false); 638 def(_fstore_3 , "fstore_3" , "b" , null , BasicType.getTVoid() , -1, false); 639 def(_dstore_0 , "dstore_0" , "b" , null , BasicType.getTVoid() , -2, false); 640 def(_dstore_1 , "dstore_1" , "b" , null , BasicType.getTVoid() , -2, false); 641 def(_dstore_2 , "dstore_2" , "b" , null , BasicType.getTVoid() , -2, false); 642 def(_dstore_3 , "dstore_3" , "b" , null , BasicType.getTVoid() , -2, false); 643 def(_astore_0 , "astore_0" , "b" , null , BasicType.getTVoid() , -1, false); 644 def(_astore_1 , "astore_1" , "b" , null , BasicType.getTVoid() , -1, false); 645 def(_astore_2 , "astore_2" , "b" , null , BasicType.getTVoid() , -1, false); 646 def(_astore_3 , "astore_3" , "b" , null , BasicType.getTVoid() , -1, false); 647 def(_iastore , "iastore" , "b" , null , BasicType.getTVoid() , -3, true ); 648 def(_lastore , "lastore" , "b" , null , BasicType.getTVoid() , -4, true ); 649 def(_fastore , "fastore" , "b" , null , BasicType.getTVoid() , -3, true ); 650 def(_dastore , "dastore" , "b" , null , BasicType.getTVoid() , -4, true ); 651 def(_aastore , "aastore" , "b" , null , BasicType.getTVoid() , -3, true ); 652 def(_bastore , "bastore" , "b" , null , BasicType.getTVoid() , -3, true ); 653 def(_castore , "castore" , "b" , null , BasicType.getTVoid() , -3, true ); 654 def(_sastore , "sastore" , "b" , null , BasicType.getTVoid() , -3, true ); 655 def(_pop , "pop" , "b" , null , BasicType.getTVoid() , -1, false); 656 def(_pop2 , "pop2" , "b" , null , BasicType.getTVoid() , -2, false); 657 def(_dup , "dup" , "b" , null , BasicType.getTVoid() , 1, false); 658 def(_dup_x1 , "dup_x1" , "b" , null , BasicType.getTVoid() , 1, false); 659 def(_dup_x2 , "dup_x2" , "b" , null , BasicType.getTVoid() , 1, false); 660 def(_dup2 , "dup2" , "b" , null , BasicType.getTVoid() , 2, false); 661 def(_dup2_x1 , "dup2_x1" , "b" , null , BasicType.getTVoid() , 2, false); 662 def(_dup2_x2 , "dup2_x2" , "b" , null , BasicType.getTVoid() , 2, false); 663 def(_swap , "swap" , "b" , null , BasicType.getTVoid() , 0, false); 664 def(_iadd , "iadd" , "b" , null , BasicType.getTInt() , -1, false); 665 def(_ladd , "ladd" , "b" , null , BasicType.getTLong() , -2, false); 666 def(_fadd , "fadd" , "b" , null , BasicType.getTFloat() , -1, false); 667 def(_dadd , "dadd" , "b" , null , BasicType.getTDouble() , -2, false); 668 def(_isub , "isub" , "b" , null , BasicType.getTInt() , -1, false); 669 def(_lsub , "lsub" , "b" , null , BasicType.getTLong() , -2, false); 670 def(_fsub , "fsub" , "b" , null , BasicType.getTFloat() , -1, false); 671 def(_dsub , "dsub" , "b" , null , BasicType.getTDouble() , -2, false); 672 def(_imul , "imul" , "b" , null , BasicType.getTInt() , -1, false); 673 def(_lmul , "lmul" , "b" , null , BasicType.getTLong() , -2, false); 674 def(_fmul , "fmul" , "b" , null , BasicType.getTFloat() , -1, false); 675 def(_dmul , "dmul" , "b" , null , BasicType.getTDouble() , -2, false); 676 def(_idiv , "idiv" , "b" , null , BasicType.getTInt() , -1, true ); 677 def(_ldiv , "ldiv" , "b" , null , BasicType.getTLong() , -2, true ); 678 def(_fdiv , "fdiv" , "b" , null , BasicType.getTFloat() , -1, false); 679 def(_ddiv , "ddiv" , "b" , null , BasicType.getTDouble() , -2, false); 680 def(_irem , "irem" , "b" , null , BasicType.getTInt() , -1, true ); 681 def(_lrem , "lrem" , "b" , null , BasicType.getTLong() , -2, true ); 682 def(_frem , "frem" , "b" , null , BasicType.getTFloat() , -1, false); 683 def(_drem , "drem" , "b" , null , BasicType.getTDouble() , -2, false); 684 def(_ineg , "ineg" , "b" , null , BasicType.getTInt() , 0, false); 685 def(_lneg , "lneg" , "b" , null , BasicType.getTLong() , 0, false); 686 def(_fneg , "fneg" , "b" , null , BasicType.getTFloat() , 0, false); 687 def(_dneg , "dneg" , "b" , null , BasicType.getTDouble() , 0, false); 688 def(_ishl , "ishl" , "b" , null , BasicType.getTInt() , -1, false); 689 def(_lshl , "lshl" , "b" , null , BasicType.getTLong() , -1, false); 690 def(_ishr , "ishr" , "b" , null , BasicType.getTInt() , -1, false); 691 def(_lshr , "lshr" , "b" , null , BasicType.getTLong() , -1, false); 692 def(_iushr , "iushr" , "b" , null , BasicType.getTInt() , -1, false); 693 def(_lushr , "lushr" , "b" , null , BasicType.getTLong() , -1, false); 694 def(_iand , "iand" , "b" , null , BasicType.getTInt() , -1, false); 695 def(_land , "land" , "b" , null , BasicType.getTLong() , -2, false); 696 def(_ior , "ior" , "b" , null , BasicType.getTInt() , -1, false); 697 def(_lor , "lor" , "b" , null , BasicType.getTLong() , -2, false); 698 def(_ixor , "ixor" , "b" , null , BasicType.getTInt() , -1, false); 699 def(_lxor , "lxor" , "b" , null , BasicType.getTLong() , -2, false); 700 def(_iinc , "iinc" , "bic" , "wbiicc", BasicType.getTVoid() , 0, false); 701 def(_i2l , "i2l" , "b" , null , BasicType.getTLong() , 1, false); 702 def(_i2f , "i2f" , "b" , null , BasicType.getTFloat() , 0, false); 703 def(_i2d , "i2d" , "b" , null , BasicType.getTDouble() , 1, false); 704 def(_l2i , "l2i" , "b" , null , BasicType.getTInt() , -1, false); 705 def(_l2f , "l2f" , "b" , null , BasicType.getTFloat() , -1, false); 706 def(_l2d , "l2d" , "b" , null , BasicType.getTDouble() , 0, false); 707 def(_f2i , "f2i" , "b" , null , BasicType.getTInt() , 0, false); 708 def(_f2l , "f2l" , "b" , null , BasicType.getTLong() , 1, false); 709 def(_f2d , "f2d" , "b" , null , BasicType.getTDouble() , 1, false); 710 def(_d2i , "d2i" , "b" , null , BasicType.getTInt() , -1, false); 711 def(_d2l , "d2l" , "b" , null , BasicType.getTLong() , 0, false); 712 def(_d2f , "d2f" , "b" , null , BasicType.getTFloat() , -1, false); 713 def(_i2b , "i2b" , "b" , null , BasicType.getTByte() , 0, false); 714 def(_i2c , "i2c" , "b" , null , BasicType.getTChar() , 0, false); 715 def(_i2s , "i2s" , "b" , null , BasicType.getTShort() , 0, false); 716 def(_lcmp , "lcmp" , "b" , null , BasicType.getTVoid() , -3, false); 717 def(_fcmpl , "fcmpl" , "b" , null , BasicType.getTVoid() , -1, false); 718 def(_fcmpg , "fcmpg" , "b" , null , BasicType.getTVoid() , -1, false); 719 def(_dcmpl , "dcmpl" , "b" , null , BasicType.getTVoid() , -3, false); 720 def(_dcmpg , "dcmpg" , "b" , null , BasicType.getTVoid() , -3, false); 721 def(_ifeq , "ifeq" , "boo" , null , BasicType.getTVoid() , -1, false); 722 def(_ifne , "ifne" , "boo" , null , BasicType.getTVoid() , -1, false); 723 def(_iflt , "iflt" , "boo" , null , BasicType.getTVoid() , -1, false); 724 def(_ifge , "ifge" , "boo" , null , BasicType.getTVoid() , -1, false); 725 def(_ifgt , "ifgt" , "boo" , null , BasicType.getTVoid() , -1, false); 726 def(_ifle , "ifle" , "boo" , null , BasicType.getTVoid() , -1, false); 727 def(_if_icmpeq , "if_icmpeq" , "boo" , null , BasicType.getTVoid() , -2, false); 728 def(_if_icmpne , "if_icmpne" , "boo" , null , BasicType.getTVoid() , -2, false); 729 def(_if_icmplt , "if_icmplt" , "boo" , null , BasicType.getTVoid() , -2, false); 730 def(_if_icmpge , "if_icmpge" , "boo" , null , BasicType.getTVoid() , -2, false); 731 def(_if_icmpgt , "if_icmpgt" , "boo" , null , BasicType.getTVoid() , -2, false); 732 def(_if_icmple , "if_icmple" , "boo" , null , BasicType.getTVoid() , -2, false); 733 def(_if_acmpeq , "if_acmpeq" , "boo" , null , BasicType.getTVoid() , -2, false); 734 def(_if_acmpne , "if_acmpne" , "boo" , null , BasicType.getTVoid() , -2, false); 735 def(_goto , "goto" , "boo" , null , BasicType.getTVoid() , 0, false); 736 def(_jsr , "jsr" , "boo" , null , BasicType.getTInt() , 0, false); 737 def(_ret , "ret" , "bi" , "wbii" , BasicType.getTVoid() , 0, false); 738 def(_tableswitch , "tableswitch" , "" , null , BasicType.getTVoid() , -1, false); // may have backward branches 739 def(_lookupswitch , "lookupswitch" , "" , null , BasicType.getTVoid() , -1, false); // rewriting in interpreter 740 def(_ireturn , "ireturn" , "b" , null , BasicType.getTInt() , -1, true ); 741 def(_lreturn , "lreturn" , "b" , null , BasicType.getTLong() , -2, true ); 742 def(_freturn , "freturn" , "b" , null , BasicType.getTFloat() , -1, true ); 743 def(_dreturn , "dreturn" , "b" , null , BasicType.getTDouble() , -2, true ); 744 def(_areturn , "areturn" , "b" , null , BasicType.getTObject() , -1, true ); 745 def(_return , "return" , "b" , null , BasicType.getTVoid() , 0, true ); 746 def(_getstatic , "getstatic" , "bJJ" , null , BasicType.getTIllegal(), 1, true ); 747 def(_putstatic , "putstatic" , "bJJ" , null , BasicType.getTIllegal(), -1, true ); 748 def(_getfield , "getfield" , "bJJ" , null , BasicType.getTIllegal(), 0, true ); 749 def(_putfield , "putfield" , "bJJ" , null , BasicType.getTIllegal(), -2, true ); 750 def(_invokevirtual , "invokevirtual" , "bJJ" , null , BasicType.getTIllegal(), -1, true ); 751 def(_invokespecial , "invokespecial" , "bJJ" , null , BasicType.getTIllegal(), -1, true ); 752 def(_invokestatic , "invokestatic" , "bJJ" , null , BasicType.getTIllegal(), 0, true ); 753 def(_invokeinterface , "invokeinterface" , "bJJ__", null , BasicType.getTIllegal(), -1, true ); 754 def(_invokedynamic , "invokedynamic" , "bJJJJ", null , BasicType.getTIllegal(), 0, true ); 755 def(_new , "new" , "bkk" , null , BasicType.getTObject() , 1, true ); 756 def(_newarray , "newarray" , "bc" , null , BasicType.getTObject() , 0, true ); 757 def(_anewarray , "anewarray" , "bkk" , null , BasicType.getTObject() , 0, true ); 758 def(_arraylength , "arraylength" , "b" , null , BasicType.getTVoid() , 0, true ); 759 def(_athrow , "athrow" , "b" , null , BasicType.getTVoid() , -1, true ); 760 def(_checkcast , "checkcast" , "bkk" , null , BasicType.getTObject() , 0, true ); 761 def(_instanceof , "instanceof" , "bkk" , null , BasicType.getTInt() , 0, true ); 762 def(_monitorenter , "monitorenter" , "b" , null , BasicType.getTVoid() , -1, true ); 763 def(_monitorexit , "monitorexit" , "b" , null , BasicType.getTVoid() , -1, true ); 764 def(_wide , "wide" , "" , null , BasicType.getTVoid() , 0, false); 765 def(_multianewarray , "multianewarray" , "bkkc" , null , BasicType.getTObject() , 1, true ); 766 def(_ifnull , "ifnull" , "boo" , null , BasicType.getTVoid() , -1, false); 767 def(_ifnonnull , "ifnonnull" , "boo" , null , BasicType.getTVoid() , -1, false); 768 def(_goto_w , "goto_w" , "boooo", null , BasicType.getTVoid() , 0, false); 769 def(_jsr_w , "jsr_w" , "boooo", null , BasicType.getTInt() , 0, false); 770 def(_breakpoint , "breakpoint" , "" , null , BasicType.getTVoid() , 0, true ); 771 772 // JVM bytecodes 773 // bytecode bytecode name format wide f. result tp stk traps std code 774 775 def(_fast_agetfield , "fast_agetfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _getfield ); 776 def(_fast_bgetfield , "fast_bgetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield ); 777 def(_fast_cgetfield , "fast_cgetfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _getfield ); 778 def(_fast_dgetfield , "fast_dgetfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _getfield ); 779 def(_fast_fgetfield , "fast_fgetfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _getfield ); 780 def(_fast_igetfield , "fast_igetfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _getfield ); 781 def(_fast_lgetfield , "fast_lgetfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _getfield ); 782 def(_fast_sgetfield , "fast_sgetfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _getfield ); 783 784 def(_fast_aputfield , "fast_aputfield" , "bJJ" , null , BasicType.getTObject() , 0, true , _putfield ); 785 def(_fast_bputfield , "fast_bputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield ); 786 def(_fast_zputfield , "fast_zputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield ); 787 def(_fast_cputfield , "fast_cputfield" , "bJJ" , null , BasicType.getTChar() , 0, true , _putfield ); 788 def(_fast_dputfield , "fast_dputfield" , "bJJ" , null , BasicType.getTDouble() , 0, true , _putfield ); 789 def(_fast_fputfield , "fast_fputfield" , "bJJ" , null , BasicType.getTFloat() , 0, true , _putfield ); 790 def(_fast_iputfield , "fast_iputfield" , "bJJ" , null , BasicType.getTInt() , 0, true , _putfield ); 791 def(_fast_lputfield , "fast_lputfield" , "bJJ" , null , BasicType.getTLong() , 0, true , _putfield ); 792 def(_fast_sputfield , "fast_sputfield" , "bJJ" , null , BasicType.getTShort() , 0, true , _putfield ); 793 794 def(_fast_aload_0 , "fast_aload_0" , "b" , null , BasicType.getTObject() , 1, true , _aload_0 ); 795 def(_fast_iaccess_0 , "fast_iaccess_0" , "b_JJ" , null , BasicType.getTInt() , 1, true , _aload_0 ); 796 def(_fast_aaccess_0 , "fast_aaccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 ); 797 def(_fast_faccess_0 , "fast_faccess_0" , "b_JJ" , null , BasicType.getTObject() , 1, true , _aload_0 ); 798 799 def(_fast_iload , "fast_iload" , "bi" , null , BasicType.getTInt() , 1, false, _iload ); 800 def(_fast_iload2 , "fast_iload2" , "bi_i" , null , BasicType.getTInt() , 2, false, _iload ); 801 def(_fast_icaload , "fast_icaload" , "bi_" , null , BasicType.getTInt() , 0, false, _iload ); 802 803 // Faster method invocation. 804 def(_fast_invokevfinal , "fast_invokevfinal" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual ); 805 806 def(_fast_linearswitch , "fast_linearswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch ); 807 def(_fast_binaryswitch , "fast_binaryswitch" , "" , null , BasicType.getTVoid() , -1, false, _lookupswitch ); 808 def(_fast_aldc , "fast_aldc" , "bj" , null , BasicType.getTObject(), 1, true, _ldc ); 809 def(_fast_aldc_w , "fast_aldc_w" , "bJJ" , null , BasicType.getTObject(), 1, true, _ldc_w ); 810 811 def(_return_register_finalizer, "return_register_finalizer", "b" , null , BasicType.getTVoid() , 0, true, _return ); 812 813 // special handling of signature-polymorphic methods 814 def(_invokehandle , "invokehandle" , "bJJ" , null , BasicType.getTIllegal(), -1, true, _invokevirtual ); 815 816 // CDS specific. Bytecodes rewritten at CDS dump time 817 def(_nofast_getfield , "_nofast_getfield" , "bJJ" , null , BasicType.getTIllegal() , 0, true, _getfield ); 818 def(_nofast_putfield , "_nofast_putfield" , "bJJ" , null , BasicType.getTIllegal() ,-2, true, _putfield ); 819 def(_nofast_aload_0 , "_nofast_aload_0" , "b" , null , BasicType.getTIllegal() , 1, true, _aload_0 ); 820 def(_nofast_iload , "_nofast_iload" , "bi" , null , BasicType.getTIllegal() , 1, false, _iload ); 821 822 def(_shouldnotreachhere , "_shouldnotreachhere" , "b" , null , BasicType.getTVoid() , 0, false); 823 824 if (Assert.ASSERTS_ENABLED) { 825 // compare can_trap information for each bytecode with the 826 // can_trap information for the corresponding base bytecode 827 // (if a rewritten bytecode can trap, so must the base bytecode) 828 for (int i = 0; i < number_of_codes; i++) { 829 if (isDefined(i)) { 830 int j = javaCode(i); 831 if (canTrap(i) && !canTrap(j)) { 832 Assert.that(false, name(i) + " can trap => " + name(j) + " can trap, too"); 833 } 834 } 835 } 836 } 837 } 838 839 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap) { 840 def(code, name, format, wide_format, result_type, depth, can_trap, code); 841 } 842 843 private static void def(int code, String name, String format, String wide_format, int result_type, int depth, boolean can_trap, int java_code) { 844 if (Assert.ASSERTS_ENABLED) { 845 Assert.that(wide_format == null || format != null, "short form must exist if there's a wide form"); 846 } 847 int len = (format != null ? format.length() : 0); 848 int wlen = (wide_format != null ? wide_format.length() : 0); 849 _name [code] = name; 850 _result_type [code] = result_type; 851 _depth [code] = (byte) depth; 852 _lengths [code] = (byte)((wlen << 4) | (len & 0xF)); 853 _java_code [code] = java_code; 854 _format [code] = format; 855 _wide_format [code] = wide_format; 856 int bc_flags = 0; 857 if (can_trap) bc_flags |= _bc_can_trap; 858 if (java_code != code) bc_flags |= _bc_can_rewrite; 859 _flags[code+0*256] = compute_flags(format, bc_flags); 860 _flags[code+1*256] = compute_flags(wide_format, bc_flags); 861 } 862 } 863