J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.java.util.jar.pack; |
| 27 | |
| 28 | /** |
| 29 | * A parsed bytecode instruction. |
| 30 | * Provides accessors to various relevant bits. |
| 31 | * @author John Rose |
| 32 | */ |
| 33 | class Instruction implements Constants { |
| 34 | protected byte[] bytes; // bytecodes |
| 35 | protected int pc; // location of this instruction |
| 36 | protected int bc; // opcode of this instruction |
| 37 | protected int w; // 0 if normal, 1 if a _wide prefix at pc |
| 38 | protected int length; // bytes in this instruction |
| 39 | |
| 40 | protected boolean special; |
| 41 | |
| 42 | protected Instruction(byte[] bytes, int pc, int bc, int w, int length) { |
| 43 | reset(bytes, pc, bc, w, length); |
| 44 | } |
| 45 | private void reset(byte[] bytes, int pc, int bc, int w, int length) { |
| 46 | this.bytes = bytes; |
| 47 | this.pc = pc; |
| 48 | this.bc = bc; |
| 49 | this.w = w; |
| 50 | this.length = length; |
| 51 | } |
| 52 | |
| 53 | public int getBC() { |
| 54 | return bc; |
| 55 | } |
| 56 | public boolean isWide() { |
| 57 | return w != 0; |
| 58 | } |
| 59 | public byte[] getBytes() { |
| 60 | return bytes; |
| 61 | } |
| 62 | public int getPC() { |
| 63 | return pc; |
| 64 | } |
| 65 | public int getLength() { |
| 66 | return length; |
| 67 | } |
| 68 | public int getNextPC() { |
| 69 | return pc + length; |
| 70 | } |
| 71 | |
| 72 | public Instruction next() { |
| 73 | int npc = pc + length; |
| 74 | if (npc == bytes.length) |
| 75 | return null; |
| 76 | else |
| 77 | return Instruction.at(bytes, npc, this); |
| 78 | } |
| 79 | |
| 80 | public boolean isNonstandard() { |
| 81 | return isNonstandard(bc); |
| 82 | } |
| 83 | |
| 84 | public void setNonstandardLength(int length) { |
| 85 | assert(isNonstandard()); |
| 86 | this.length = length; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | /** A fake instruction at this pc whose next() will be at nextpc. */ |
| 91 | public Instruction forceNextPC(int nextpc) { |
| 92 | int length = nextpc - pc; |
| 93 | return new Instruction(bytes, pc, -1, -1, length); |
| 94 | } |
| 95 | |
| 96 | public static Instruction at(byte[] bytes, int pc) { |
| 97 | return Instruction.at(bytes, pc, null); |
| 98 | } |
| 99 | |
| 100 | public static Instruction at(byte[] bytes, int pc, Instruction reuse) { |
| 101 | int bc = getByte(bytes, pc); |
| 102 | int prefix = -1; |
| 103 | int w = 0; |
| 104 | int length = BC_LENGTH[w][bc]; |
| 105 | if (length == 0) { |
| 106 | // Hard cases: |
| 107 | switch (bc) { |
| 108 | case _wide: |
| 109 | bc = getByte(bytes, pc+1); |
| 110 | w = 1; |
| 111 | length = BC_LENGTH[w][bc]; |
| 112 | if (length == 0) { |
| 113 | // unknown instruction; treat as one byte |
| 114 | length = 1; |
| 115 | } |
| 116 | break; |
| 117 | case _tableswitch: |
| 118 | return new TableSwitch(bytes, pc); |
| 119 | case _lookupswitch: |
| 120 | return new LookupSwitch(bytes, pc); |
| 121 | default: |
| 122 | // unknown instruction; treat as one byte |
| 123 | length = 1; |
| 124 | break; |
| 125 | } |
| 126 | } |
| 127 | assert(length > 0); |
| 128 | assert(pc+length <= bytes.length); |
| 129 | // Speed hack: Instruction.next reuses self if possible. |
| 130 | if (reuse != null && !reuse.special) { |
| 131 | reuse.reset(bytes, pc, bc, w, length); |
| 132 | return reuse; |
| 133 | } |
| 134 | return new Instruction(bytes, pc, bc, w, length); |
| 135 | } |
| 136 | |
| 137 | // Return the constant pool reference type, or 0 if none. |
| 138 | public byte getCPTag() { |
| 139 | return BC_TAG[w][bc]; |
| 140 | } |
| 141 | |
| 142 | // Return the constant pool index, or -1 if none. |
| 143 | public int getCPIndex() { |
| 144 | int indexLoc = BC_INDEX[w][bc]; |
| 145 | if (indexLoc == 0) return -1; |
| 146 | assert(w == 0); |
| 147 | if (length == 2) |
| 148 | return getByte(bytes, pc+indexLoc); // _ldc opcode only |
| 149 | else |
| 150 | return getShort(bytes, pc+indexLoc); |
| 151 | } |
| 152 | |
| 153 | public void setCPIndex(int cpi) { |
| 154 | int indexLoc = BC_INDEX[w][bc]; |
| 155 | assert(indexLoc != 0); |
| 156 | if (length == 2) |
| 157 | setByte(bytes, pc+indexLoc, cpi); // _ldc opcode only |
| 158 | else |
| 159 | setShort(bytes, pc+indexLoc, cpi); |
| 160 | assert(getCPIndex() == cpi); |
| 161 | } |
| 162 | |
| 163 | public ConstantPool.Entry getCPRef(ConstantPool.Entry[] cpMap) { |
| 164 | int index = getCPIndex(); |
| 165 | return (index < 0) ? null : cpMap[index]; |
| 166 | } |
| 167 | |
| 168 | // Return the slot of the affected local, or -1 if none. |
| 169 | public int getLocalSlot() { |
| 170 | int slotLoc = BC_SLOT[w][bc]; |
| 171 | if (slotLoc == 0) return -1; |
| 172 | if (w == 0) |
| 173 | return getByte(bytes, pc+slotLoc); |
| 174 | else |
| 175 | return getShort(bytes, pc+slotLoc); |
| 176 | } |
| 177 | |
| 178 | // Return the target of the branch, or -1 if none. |
| 179 | public int getBranchLabel() { |
| 180 | int branchLoc = BC_BRANCH[w][bc]; |
| 181 | if (branchLoc == 0) return -1; |
| 182 | assert(w == 0); |
| 183 | assert(length == 3 || length == 5); |
| 184 | int offset; |
| 185 | if (length == 3) |
| 186 | offset = (short)getShort(bytes, pc+branchLoc); |
| 187 | else |
| 188 | offset = getInt(bytes, pc+branchLoc); |
| 189 | assert(offset+pc >= 0); |
| 190 | assert(offset+pc <= bytes.length); |
| 191 | return offset+pc; |
| 192 | } |
| 193 | |
| 194 | public void setBranchLabel(int targetPC) { |
| 195 | int branchLoc = BC_BRANCH[w][bc]; |
| 196 | assert(branchLoc != 0); |
| 197 | if (length == 3) |
| 198 | setShort(bytes, pc+branchLoc, targetPC-pc); |
| 199 | else |
| 200 | setInt(bytes, pc+branchLoc, targetPC-pc); |
| 201 | assert(targetPC == getBranchLabel()); |
| 202 | } |
| 203 | |
| 204 | // Return the trailing constant in the instruction (as a signed value). |
| 205 | // Return 0 if there is none. |
| 206 | public int getConstant() { |
| 207 | int conLoc = BC_CON[w][bc]; |
| 208 | if (conLoc == 0) return 0; |
| 209 | switch (length - conLoc) { |
| 210 | case 1: return (byte) getByte(bytes, pc+conLoc); |
| 211 | case 2: return (short) getShort(bytes, pc+conLoc); |
| 212 | } |
| 213 | assert(false); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | public void setConstant(int con) { |
| 218 | int conLoc = BC_CON[w][bc]; |
| 219 | assert(conLoc != 0); |
| 220 | switch (length - conLoc) { |
| 221 | case 1: setByte(bytes, pc+conLoc, con); break; |
| 222 | case 2: setShort(bytes, pc+conLoc, con); break; |
| 223 | } |
| 224 | assert(con == getConstant()); |
| 225 | } |
| 226 | |
| 227 | public abstract static class Switch extends Instruction { |
| 228 | // Each case is a (value, label) pair, indexed 0 <= n < caseCount |
| 229 | public abstract int getCaseCount(); |
| 230 | public abstract int getCaseValue(int n); |
| 231 | public abstract int getCaseLabel(int n); |
| 232 | public abstract void setCaseCount(int caseCount); |
| 233 | public abstract void setCaseValue(int n, int value); |
| 234 | public abstract void setCaseLabel(int n, int targetPC); |
| 235 | protected abstract int getLength(int caseCount); |
| 236 | |
| 237 | public int getDefaultLabel() { return intAt(0)+pc; } |
| 238 | public void setDefaultLabel(int targetPC) { setIntAt(0, targetPC-pc); } |
| 239 | |
| 240 | protected int apc; // aligned pc (table base) |
| 241 | protected int intAt(int n) { return getInt(bytes, apc + n*4); } |
| 242 | protected void setIntAt(int n, int x) { setInt(bytes, apc + n*4, x); } |
| 243 | protected Switch(byte[] bytes, int pc, int bc) { |
| 244 | super(bytes, pc, bc, /*w*/0, /*length*/0); |
| 245 | this.apc = alignPC(pc+1); |
| 246 | this.special = true; |
| 247 | length = getLength(getCaseCount()); |
| 248 | } |
| 249 | public int getAlignedPC() { return apc; } |
| 250 | public String toString() { |
| 251 | String s = super.toString(); |
| 252 | s += " Default:"+labstr(getDefaultLabel()); |
| 253 | int caseCount = getCaseCount(); |
| 254 | for (int i = 0; i < caseCount; i++) { |
| 255 | s += "\n\tCase "+getCaseValue(i)+":"+labstr(getCaseLabel(i)); |
| 256 | } |
| 257 | return s; |
| 258 | } |
| 259 | public static int alignPC(int apc) { |
| 260 | while (apc % 4 != 0) ++apc; |
| 261 | return apc; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | public static class TableSwitch extends Switch { |
| 266 | // apc: (df, lo, hi, (hi-lo+1)*(label)) |
| 267 | public int getLowCase() { return intAt(1); } |
| 268 | public int getHighCase() { return intAt(2); } |
| 269 | public int getCaseCount() { return intAt(2)-intAt(1)+1; } |
| 270 | public int getCaseValue(int n) { return getLowCase()+n; } |
| 271 | public int getCaseLabel(int n) { return intAt(3+n)+pc; } |
| 272 | |
| 273 | public void setLowCase(int val) { setIntAt(1, val); } |
| 274 | public void setHighCase(int val) { setIntAt(2, val); } |
| 275 | public void setCaseLabel(int n, int tpc) { setIntAt(3+n, tpc-pc); } |
| 276 | public void setCaseCount(int caseCount) { |
| 277 | setHighCase(getLowCase() + caseCount - 1); |
| 278 | length = getLength(caseCount); |
| 279 | } |
| 280 | public void setCaseValue(int n, int val) { |
| 281 | if (n != 0) throw new UnsupportedOperationException(); |
| 282 | int caseCount = getCaseCount(); |
| 283 | setLowCase(val); |
| 284 | setCaseCount(caseCount); // keep invariant |
| 285 | } |
| 286 | |
| 287 | TableSwitch(byte[] bytes, int pc) { |
| 288 | super(bytes, pc, _tableswitch); |
| 289 | } |
| 290 | protected int getLength(int caseCount) { |
| 291 | return (apc-pc) + (3 + caseCount) * 4; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | public static class LookupSwitch extends Switch { |
| 296 | // apc: (df, nc, nc*(case, label)) |
| 297 | public int getCaseCount() { return intAt(1); } |
| 298 | public int getCaseValue(int n) { return intAt(2+n*2+0); } |
| 299 | public int getCaseLabel(int n) { return intAt(2+n*2+1)+pc; } |
| 300 | |
| 301 | public void setCaseCount(int caseCount) { |
| 302 | setIntAt(1, caseCount); |
| 303 | length = getLength(caseCount); |
| 304 | } |
| 305 | public void setCaseValue(int n, int val) { setIntAt(2+n*2+0, val); } |
| 306 | public void setCaseLabel(int n, int tpc) { setIntAt(2+n*2+1, tpc-pc); } |
| 307 | |
| 308 | LookupSwitch(byte[] bytes, int pc) { |
| 309 | super(bytes, pc, _lookupswitch); |
| 310 | } |
| 311 | protected int getLength(int caseCount) { |
| 312 | return (apc-pc) + (2 + caseCount*2) * 4; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | /** Two insns are equal if they have the same bytes. */ |
| 317 | public boolean equals(Object o) { |
| 318 | return (o instanceof Instruction) && equals((Instruction)o); |
| 319 | } |
| 320 | |
| 321 | public boolean equals(Instruction that) { |
| 322 | if (this.bc != that.bc) return false; |
| 323 | if (this.w != that.w) return false; |
| 324 | if (this.length != that.length) return false; |
| 325 | for (int i = 1; i < length; i++) { |
| 326 | if (this.bytes[this.pc+i] != that.bytes[that.pc+i]) |
| 327 | return false; |
| 328 | } |
| 329 | return true; |
| 330 | } |
| 331 | |
| 332 | static String labstr(int pc) { |
| 333 | if (pc >= 0 && pc < 100000) |
| 334 | return ((100000+pc)+"").substring(1); |
| 335 | return pc+""; |
| 336 | } |
| 337 | public String toString() { |
| 338 | return toString(null); |
| 339 | } |
| 340 | public String toString(ConstantPool.Entry[] cpMap) { |
| 341 | String s = labstr(pc) + ": "; |
| 342 | if (bc >= _bytecode_limit) { |
| 343 | s += Integer.toHexString(bc); |
| 344 | return s; |
| 345 | } |
| 346 | if (w == 1) s += "wide "; |
| 347 | String bcname = (bc < BC_NAME.length)? BC_NAME[bc]: null; |
| 348 | if (bcname == null) { |
| 349 | return s+"opcode#"+bc; |
| 350 | } |
| 351 | s += bcname; |
| 352 | int tag = getCPTag(); |
| 353 | if (tag != 0) s += " "+ConstantPool.tagName(tag)+":"; |
| 354 | int idx = getCPIndex(); |
| 355 | if (idx >= 0) s += (cpMap == null) ? ""+idx : "="+cpMap[idx].stringValue(); |
| 356 | int slt = getLocalSlot(); |
| 357 | if (slt >= 0) s += " Local:"+slt; |
| 358 | int lab = getBranchLabel(); |
| 359 | if (lab >= 0) s += " To:"+labstr(lab); |
| 360 | int con = getConstant(); |
| 361 | if (con != 0) s += " Con:"+con; |
| 362 | return s; |
| 363 | } |
| 364 | |
| 365 | |
| 366 | //public static byte constantPoolTagFor(int bc) { return BC_TAG[0][bc]; } |
| 367 | |
| 368 | /// Fetching values from byte arrays: |
| 369 | |
| 370 | public int getIntAt(int off) { |
| 371 | return getInt(bytes, pc+off); |
| 372 | } |
| 373 | public int getShortAt(int off) { |
| 374 | return getShort(bytes, pc+off); |
| 375 | } |
| 376 | public int getByteAt(int off) { |
| 377 | return getByte(bytes, pc+off); |
| 378 | } |
| 379 | |
| 380 | |
| 381 | public static int getInt(byte[] bytes, int pc) { |
| 382 | return (getShort(bytes, pc+0) << 16) + (getShort(bytes, pc+2) << 0); |
| 383 | } |
| 384 | public static int getShort(byte[] bytes, int pc) { |
| 385 | return (getByte(bytes, pc+0) << 8) + (getByte(bytes, pc+1) << 0); |
| 386 | } |
| 387 | public static int getByte(byte[] bytes, int pc) { |
| 388 | return bytes[pc] & 0xFF; |
| 389 | } |
| 390 | |
| 391 | |
| 392 | public static void setInt(byte[] bytes, int pc, int x) { |
| 393 | setShort(bytes, pc+0, x >> 16); |
| 394 | setShort(bytes, pc+2, x >> 0); |
| 395 | } |
| 396 | public static void setShort(byte[] bytes, int pc, int x) { |
| 397 | setByte(bytes, pc+0, x >> 8); |
| 398 | setByte(bytes, pc+1, x >> 0); |
| 399 | } |
| 400 | public static void setByte(byte[] bytes, int pc, int x) { |
| 401 | bytes[pc] = (byte)x; |
| 402 | } |
| 403 | |
| 404 | // some bytecode classifiers |
| 405 | |
| 406 | |
| 407 | public static boolean isNonstandard(int bc) { |
| 408 | return BC_LENGTH[0][bc] < 0; |
| 409 | } |
| 410 | |
| 411 | public static int opLength(int bc) { |
| 412 | int l = BC_LENGTH[0][bc]; |
| 413 | assert(l > 0); |
| 414 | return l; |
| 415 | } |
| 416 | public static int opWideLength(int bc) { |
| 417 | int l = BC_LENGTH[1][bc]; |
| 418 | assert(l > 0); |
| 419 | return l; |
| 420 | } |
| 421 | |
| 422 | public static boolean isLocalSlotOp(int bc) { |
| 423 | return (bc < BC_SLOT[0].length && BC_SLOT[0][bc] > 0); |
| 424 | } |
| 425 | |
| 426 | public static boolean isBranchOp(int bc) { |
| 427 | return (bc < BC_BRANCH[0].length && BC_BRANCH[0][bc] > 0); |
| 428 | } |
| 429 | |
| 430 | public static boolean isCPRefOp(int bc) { |
| 431 | if (bc < BC_INDEX[0].length && BC_INDEX[0][bc] > 0) return true; |
| 432 | if (bc >= _xldc_op && bc < _xldc_limit) return true; |
| 433 | return false; |
| 434 | } |
| 435 | |
| 436 | public static byte getCPRefOpTag(int bc) { |
| 437 | if (bc < BC_INDEX[0].length && BC_INDEX[0][bc] > 0) return BC_TAG[0][bc]; |
| 438 | if (bc >= _xldc_op && bc < _xldc_limit) return CONSTANT_Literal; |
| 439 | return CONSTANT_None; |
| 440 | } |
| 441 | |
| 442 | public static boolean isFieldOp(int bc) { |
| 443 | return (bc >= _getstatic && bc <= _putfield); |
| 444 | } |
| 445 | |
| 446 | public static boolean isInvokeInitOp(int bc) { |
| 447 | return (bc >= _invokeinit_op && bc < _invokeinit_limit); |
| 448 | } |
| 449 | |
| 450 | public static boolean isSelfLinkerOp(int bc) { |
| 451 | return (bc >= _self_linker_op && bc < _self_linker_limit); |
| 452 | } |
| 453 | |
| 454 | /// Format definitions. |
| 455 | |
| 456 | static private final byte[][] BC_LENGTH = new byte[2][0x100]; |
| 457 | static private final byte[][] BC_INDEX = new byte[2][0x100]; |
| 458 | static private final byte[][] BC_TAG = new byte[2][0x100]; |
| 459 | static private final byte[][] BC_BRANCH = new byte[2][0x100]; |
| 460 | static private final byte[][] BC_SLOT = new byte[2][0x100]; |
| 461 | static private final byte[][] BC_CON = new byte[2][0x100]; |
| 462 | static private final String[] BC_NAME = new String[0x100]; // debug only |
| 463 | static private final String[][] BC_FORMAT = new String[2][_bytecode_limit]; // debug only |
| 464 | static { |
| 465 | for (int i = 0; i < _bytecode_limit; i++) { |
| 466 | BC_LENGTH[0][i] = -1; |
| 467 | BC_LENGTH[1][i] = -1; |
| 468 | } |
| 469 | def("b", _nop, _dconst_1); |
| 470 | def("bx", _bipush); |
| 471 | def("bxx", _sipush); |
| 472 | def("bk", _ldc); // do not pack |
| 473 | def("bkk", _ldc_w, _ldc2_w); // do not pack |
| 474 | def("blwbll", _iload, _aload); |
| 475 | def("b", _iload_0, _saload); |
| 476 | def("blwbll", _istore, _astore); |
| 477 | def("b", _istore_0, _lxor); |
| 478 | def("blxwbllxx", _iinc); |
| 479 | def("b", _i2l, _dcmpg); |
| 480 | def("boo", _ifeq, _jsr); // pack oo |
| 481 | def("blwbll", _ret); |
| 482 | def("", _tableswitch, _lookupswitch); // pack all ints, omit padding |
| 483 | def("b", _ireturn, _return); |
| 484 | def("bkf", _getstatic, _putfield); // pack kf (base=Field) |
| 485 | def("bkm", _invokevirtual, _invokestatic); // pack kn (base=Method) |
| 486 | def("bkixx", _invokeinterface); // pack ki (base=IMethod), omit xx |
| 487 | def("", _xxxunusedxxx); |
| 488 | def("bkc", _new); // pack kc |
| 489 | def("bx", _newarray); |
| 490 | def("bkc", _anewarray); // pack kc |
| 491 | def("b", _arraylength, _athrow); |
| 492 | def("bkc", _checkcast, _instanceof); // pack kc |
| 493 | def("b", _monitorenter, _monitorexit); |
| 494 | def("", _wide); |
| 495 | def("bkcx", _multianewarray); // pack kc |
| 496 | def("boo", _ifnull, _ifnonnull); // pack oo |
| 497 | def("boooo", _goto_w, _jsr_w); // pack oooo |
| 498 | for (int i = 0; i < _bytecode_limit; i++) { |
| 499 | //System.out.println(i+": l="+BC_LENGTH[0][i]+" i="+BC_INDEX[0][i]); |
| 500 | //assert(BC_LENGTH[0][i] != -1); |
| 501 | if (BC_LENGTH[0][i] == -1) { |
| 502 | assert(i == _xxxunusedxxx); |
| 503 | continue; // unknown opcode |
| 504 | } |
| 505 | |
| 506 | // Have a complete mapping, to support spurious _wide prefixes. |
| 507 | if (BC_LENGTH[1][i] == -1) |
| 508 | BC_LENGTH[1][i] = (byte)(1+BC_LENGTH[0][i]); |
| 509 | } |
| 510 | |
| 511 | String names = |
| 512 | "nop aconst_null iconst_m1 iconst_0 iconst_1 iconst_2 iconst_3 iconst_4 "+ |
| 513 | "iconst_5 lconst_0 lconst_1 fconst_0 fconst_1 fconst_2 dconst_0 dconst_1 "+ |
| 514 | "bipush sipush ldc ldc_w ldc2_w iload lload fload dload aload iload_0 "+ |
| 515 | "iload_1 iload_2 iload_3 lload_0 lload_1 lload_2 lload_3 fload_0 fload_1 "+ |
| 516 | "fload_2 fload_3 dload_0 dload_1 dload_2 dload_3 aload_0 aload_1 aload_2 "+ |
| 517 | "aload_3 iaload laload faload daload aaload baload caload saload istore "+ |
| 518 | "lstore fstore dstore astore istore_0 istore_1 istore_2 istore_3 lstore_0 "+ |
| 519 | "lstore_1 lstore_2 lstore_3 fstore_0 fstore_1 fstore_2 fstore_3 dstore_0 "+ |
| 520 | "dstore_1 dstore_2 dstore_3 astore_0 astore_1 astore_2 astore_3 iastore "+ |
| 521 | "lastore fastore dastore aastore bastore castore sastore pop pop2 dup "+ |
| 522 | "dup_x1 dup_x2 dup2 dup2_x1 dup2_x2 swap iadd ladd fadd dadd isub lsub "+ |
| 523 | "fsub dsub imul lmul fmul dmul idiv ldiv fdiv ddiv irem lrem frem drem "+ |
| 524 | "ineg lneg fneg dneg ishl lshl ishr lshr iushr lushr iand land ior lor "+ |
| 525 | "ixor lxor iinc i2l i2f i2d l2i l2f l2d f2i f2l f2d d2i d2l d2f i2b i2c "+ |
| 526 | "i2s lcmp fcmpl fcmpg dcmpl dcmpg ifeq ifne iflt ifge ifgt ifle if_icmpeq "+ |
| 527 | "if_icmpne if_icmplt if_icmpge if_icmpgt if_icmple if_acmpeq if_acmpne "+ |
| 528 | "goto jsr ret tableswitch lookupswitch ireturn lreturn freturn dreturn "+ |
| 529 | "areturn return getstatic putstatic getfield putfield invokevirtual "+ |
| 530 | "invokespecial invokestatic invokeinterface xxxunusedxxx new newarray "+ |
| 531 | "anewarray arraylength athrow checkcast instanceof monitorenter "+ |
| 532 | "monitorexit wide multianewarray ifnull ifnonnull goto_w jsr_w "; |
| 533 | for (int bc = 0; names.length() > 0; bc++) { |
| 534 | int sp = names.indexOf(' '); |
| 535 | BC_NAME[bc] = names.substring(0, sp); |
| 536 | names = names.substring(sp+1); |
| 537 | } |
| 538 | } |
| 539 | public static String byteName(int bc) { |
| 540 | String iname; |
| 541 | if (bc < BC_NAME.length && BC_NAME[bc] != null) { |
| 542 | iname = BC_NAME[bc]; |
| 543 | } else if (isSelfLinkerOp(bc)) { |
| 544 | int idx = (bc - _self_linker_op); |
| 545 | boolean isSuper = (idx >= _self_linker_super_flag); |
| 546 | if (isSuper) idx -= _self_linker_super_flag; |
| 547 | boolean isAload = (idx >= _self_linker_aload_flag); |
| 548 | if (isAload) idx -= _self_linker_aload_flag; |
| 549 | int origBC = _first_linker_op + idx; |
| 550 | assert(origBC >= _first_linker_op && origBC <= _last_linker_op); |
| 551 | iname = BC_NAME[origBC]; |
| 552 | iname += (isSuper ? "_super" : "_this"); |
| 553 | if (isAload) iname = "aload_0&" + iname; |
| 554 | iname = "*"+iname; |
| 555 | } else if (isInvokeInitOp(bc)) { |
| 556 | int idx = (bc - _invokeinit_op); |
| 557 | switch (idx) { |
| 558 | case _invokeinit_self_option: |
| 559 | iname = "*invokespecial_init_this"; break; |
| 560 | case _invokeinit_super_option: |
| 561 | iname = "*invokespecial_init_super"; break; |
| 562 | default: |
| 563 | assert(idx == _invokeinit_new_option); |
| 564 | iname = "*invokespecial_init_new"; break; |
| 565 | } |
| 566 | } else { |
| 567 | switch (bc) { |
| 568 | case _ildc: iname = "*ildc"; break; |
| 569 | case _fldc: iname = "*fldc"; break; |
| 570 | case _ildc_w: iname = "*ildc_w"; break; |
| 571 | case _fldc_w: iname = "*fldc_w"; break; |
| 572 | case _dldc2_w: iname = "*dldc2_w"; break; |
| 573 | case _cldc: iname = "*cldc"; break; |
| 574 | case _cldc_w: iname = "*cldc_w"; break; |
| 575 | case _byte_escape: iname = "*byte_escape"; break; |
| 576 | case _ref_escape: iname = "*ref_escape"; break; |
| 577 | case _end_marker: iname = "*end"; break; |
| 578 | default: iname = "*bc#"+bc; break; |
| 579 | } |
| 580 | } |
| 581 | return iname; |
| 582 | } |
| 583 | private static int BW = 4; // width of classification field |
| 584 | private static void def(String fmt, int bc) { |
| 585 | def(fmt, bc, bc); |
| 586 | } |
| 587 | private static void def(String fmt, int from_bc, int to_bc) { |
| 588 | String[] fmts = { fmt, null }; |
| 589 | if (fmt.indexOf('w') > 0) { |
| 590 | fmts[1] = fmt.substring(fmt.indexOf('w')); |
| 591 | fmts[0] = fmt.substring(0, fmt.indexOf('w')); |
| 592 | } |
| 593 | for (int w = 0; w <= 1; w++) { |
| 594 | fmt = fmts[w]; |
| 595 | if (fmt == null) continue; |
| 596 | int length = fmt.length(); |
| 597 | int index = Math.max(0, fmt.indexOf('k')); |
| 598 | int tag = CONSTANT_None; |
| 599 | int branch = Math.max(0, fmt.indexOf('o')); |
| 600 | int slot = Math.max(0, fmt.indexOf('l')); |
| 601 | int con = Math.max(0, fmt.indexOf('x')); |
| 602 | if (index > 0 && index+1 < length) { |
| 603 | switch (fmt.charAt(index+1)) { |
| 604 | case 'c': tag = CONSTANT_Class; break; |
| 605 | case 'k': tag = CONSTANT_Literal; break; |
| 606 | case 'f': tag = CONSTANT_Fieldref; break; |
| 607 | case 'm': tag = CONSTANT_Methodref; break; |
| 608 | case 'i': tag = CONSTANT_InterfaceMethodref; break; |
| 609 | } |
| 610 | assert(tag != CONSTANT_None); |
| 611 | } else if (index > 0 && length == 2) { |
| 612 | assert(from_bc == _ldc); |
| 613 | tag = CONSTANT_Literal; // _ldc opcode only |
| 614 | } |
| 615 | for (int bc = from_bc; bc <= to_bc; bc++) { |
| 616 | BC_FORMAT[w][bc] = fmt; |
| 617 | assert(BC_LENGTH[w][bc] == -1); |
| 618 | BC_LENGTH[w][bc] = (byte) length; |
| 619 | BC_INDEX[w][bc] = (byte) index; |
| 620 | BC_TAG[w][bc] = (byte) tag; |
| 621 | assert(!(index == 0 && tag != CONSTANT_None)); |
| 622 | BC_BRANCH[w][bc] = (byte) branch; |
| 623 | BC_SLOT[w][bc] = (byte) slot; |
| 624 | assert(branch == 0 || slot == 0); // not both branch & local |
| 625 | assert(branch == 0 || index == 0); // not both branch & cp |
| 626 | assert(slot == 0 || index == 0); // not both local & cp |
| 627 | BC_CON[w][bc] = (byte) con; |
| 628 | } |
| 629 | } |
| 630 | } |
| 631 | } |