src/vm/jit/parse.c

   1 /* src/vm/jit/parse.c - parser for JavaVM to intermediate code translation
   2
   3    Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    Contact: cacao@cacaojvm.org
  26
  27    Author: Andreas Krall
  28
  29    Changes: Carolyn Oates
  30             Edwin Steiner
  31             Joseph Wenninger
  32             Christian Thalinger
  33
  34    $Id: parse.c 5482 2006-09-12 21:34:03Z edwin $
  35
  36 */
  37
  38
  39 #include "config.h"
  40
  41 #include <assert.h>
  42 #include <string.h>
  43
  44 #include "vm/types.h"
  45
  46 #include "mm/memory.h"
  47 #include "native/native.h"
  48
  49 #if defined(ENABLE_THREADS)
  50 # include "threads/native/lock.h"
  51 #endif
  52
  53 #include "toolbox/logging.h"
  54 #include "vm/builtin.h"
  55 #include "vm/exceptions.h"
  56 #include "vm/global.h"
  57 #include "vm/linker.h"
  58 #include "vm/loader.h"
  59 #include "vm/resolve.h"
  60 #include "vm/options.h"
  61 #include "vm/statistics.h"
  62 #include "vm/stringlocal.h"
  63 #include "vm/suck.h"
  64 #include "vm/jit/asmpart.h"
  65 #include "vm/jit/jit.h"
  66 #include "vm/jit/parse.h"
  67 #include "vm/jit/patcher.h"
  68 #include "vm/jit/loop/loop.h"
  69
  70 #define INSTRUCTIONS_INCREMENT  5  /* number of additional instructions to    */
  71                                    /* allocate if space runs out              */
  72
  73
  74 /* parserdata_t ***************************************************************/
  75
  76 typedef struct parsedata_t parsedata_t;
  77
  78 struct parsedata_t {
  79         instruction *instructions;          /* instruction array                  */
  80         s4           instructionslength;    /* length of the instruction array    */
  81         u1          *instructionstart;
  82 };
  83
  84
  85 /* parse_setup *****************************************************************
  86
  87    Fills the passed parsedata_t structure.
  88
  89 *******************************************************************************/
  90
  91 static void parse_setup(jitdata *jd, parsedata_t *pd)
  92 {
  93         methodinfo *m;
  94
  95         /* get required compiler data */
  96
  97         m = jd->m;
  98
  99         /* Allocate instruction array and block index table (1 additional
 100            for end ipc). */
 101
 102         jd->new_basicblockindex = DMNEW(s4, m->jcodelength + 1);
 103         pd->instructionstart = DMNEW(u1, m->jcodelength + 1);
 104
 105         MZERO(jd->new_basicblockindex, s4, m->jcodelength + 1);
 106         MZERO(pd->instructionstart, u1, m->jcodelength + 1);
 107
 108         /* Set the length of the instruction array.  We simply add 5 more
 109            instruction, as this seems to be a reasonable value. */
 110
 111         pd->instructionslength = m->jcodelength + 1;
 112
 113         /* allocate the instruction array */
 114
 115         pd->instructions = DMNEW(instruction, pd->instructionslength);
 116
 117         /* Zero the intermediate instructions array so we don't have any
 118            invalid pointers in it if we cannot finish stack_analyse(). */
 119
 120         MZERO(pd->instructions, instruction, pd->instructionslength);
 121 }
 122
 123
 124 /* parse_realloc_instructions **************************************************
 125
 126    Reallocate the instructions array so there is room for at least N
 127    additional instructions.
 128
 129    RETURN VALUE:
 130        the new value for iptr
 131
 132 *******************************************************************************/
 133
 134 static instruction *parse_realloc_instructions(parsedata_t *pd, s4 ipc, s4 n)
 135 {
 136         /* increase the size of the instruction array */
 137
 138         pd->instructionslength += (n + INSTRUCTIONS_INCREMENT);
 139
 140         /* reallocate the array */
 141
 142         pd->instructions = DMREALLOC(pd->instructions, instruction, ipc,
 143                                                                  pd->instructionslength);
 144
 145         /* return the iptr */
 146
 147         return pd->instructions + ipc;
 148 }
 149
 150
 151 /*******************************************************************************
 152
 153         function 'parse' scans the JavaVM code and generates intermediate code
 154
 155         During parsing the block index table is used to store at bit pos 0
 156         a flag which marks basic block starts and at position 1 to 31 the
 157         intermediate instruction index. After parsing the block index table
 158         is scanned, for marked positions a block is generated and the block
 159         number is stored in the block index table.
 160
 161 *******************************************************************************/
 162
 163 static exceptiontable * new_fillextable(
 164                                                                         jitdata *jd,
 165                                                                         methodinfo *m,
 166                                                                         exceptiontable *extable,
 167                                                                         exceptiontable *raw_extable,
 168                                                                 int exceptiontablelength,
 169                                                                         int *block_count)
 170 {
 171         int b_count, p, src;
 172
 173         if (exceptiontablelength == 0)
 174                 return extable;
 175
 176         b_count = *block_count;
 177
 178         for (src = exceptiontablelength-1; src >=0; src--) {
 179                 /* the start of the handled region becomes a basic block start */
 180                 p = raw_extable[src].startpc;
 181                 CHECK_BYTECODE_INDEX(p);
 182                 extable->startpc = p;
 183                 MARK_BASICBLOCK(p);
 184
 185                 p = raw_extable[src].endpc; /* see JVM Spec 4.7.3 */
 186                 CHECK_BYTECODE_INDEX_EXCLUSIVE(p);
 187
 188 #if defined(ENABLE_VERIFIER)
 189                 if (p <= raw_extable[src].startpc) {
 190                         exceptions_throw_verifyerror(m,
 191                                 "Invalid exception handler range");
 192                         return NULL;
 193                 }
 194 #endif
 195                 extable->endpc = p;
 196
 197                 /* end of handled region becomes a basic block boundary  */
 198                 /* (If it is the bytecode end, we'll use the special     */
 199                 /* end block that is created anyway.)                    */
 200                 if (p < m->jcodelength)
 201                         MARK_BASICBLOCK(p);
 202
 203                 /* the start of the handler becomes a basic block start  */
 204                 p = raw_extable[src].handlerpc;
 205                 CHECK_BYTECODE_INDEX(p);
 206                 extable->handlerpc = p;
 207                 MARK_BASICBLOCK(p);
 208
 209                 extable->catchtype = raw_extable[src].catchtype;
 210                 extable->next = NULL;
 211                 extable->down = &extable[1];
 212                 extable--;
 213         }
 214
 215         *block_count = b_count;
 216
 217         /* everything ok */
 218         return extable;
 219
 220 #if defined(ENABLE_VERIFIER)
 221 throw_invalid_bytecode_index:
 222         exceptions_throw_verifyerror(m,
 223                                                                  "Illegal bytecode index in exception table");
 224         return NULL;
 225 #endif
 226 }
 227
 228 /*** macro for checking the length of the bytecode ***/
 229
 230 #if defined(ENABLE_VERIFIER)
 231 #define CHECK_END_OF_BYTECODE(neededlength) \
 232         do { \
 233                 if ((neededlength) > m->jcodelength) \
 234                         goto throw_unexpected_end_of_bytecode; \
 235         } while (0)
 236 #else /* !ENABLE_VERIFIER */
 237 #define CHECK_END_OF_BYTECODE(neededlength)
 238 #endif /* ENABLE_VERIFIER */
 239
 240 bool new_parse(jitdata *jd)
 241 {
 242         methodinfo  *m;                     /* method being parsed                */
 243         codeinfo    *code;
 244         codegendata *cd;
 245         parsedata_t  pd;
 246         instruction *iptr;                  /* current ptr into instruction array */
 247         s4           ipc;                   /* intermediate instruction counter   */
 248         s4           p;                     /* java instruction counter           */
 249         s4           nextp;                 /* start of next java instruction     */
 250         s4           opcode;                /* java opcode                        */
 251         s4           i;
 252         s4           j;
 253         int  b_count = 0;           /* basic block counter                      */
 254         int  s_count = 0;           /* stack element counter                    */
 255         bool blockend = false;      /* true if basic block end has been reached */
 256         bool iswide = false;        /* true if last instruction was a wide      */
 257         constant_classref  *cr;
 258         constant_classref  *compr;
 259         classinfo          *c;
 260         builtintable_entry *bte;
 261         constant_FMIref    *mr;
 262         methoddesc         *md;
 263         unresolved_method  *um;
 264         resolve_result_t    result;
 265         u2                  lineindex = 0;
 266         u2                  currentline = 0;
 267         u2                  linepcchange = 0;
 268         u4                  flags;
 269         basicblock         *bptr;
 270
 271         int                *local_map; /* local pointer to renaming structore     */
 272                                        /* is assigned to rd->local_map at the end */
 273         /* get required compiler data */
 274
 275         m    = jd->m;
 276         code = jd->code;
 277         cd   = jd->cd;
 278
 279         /* allocate buffers for local variable renaming */
 280         local_map = DMNEW(int, cd->maxlocals * 5);
 281         for (i = 0; i < cd->maxlocals; i++) {
 282                 local_map[i * 5 + 0] = 0;
 283                 local_map[i * 5 + 1] = 0;
 284                 local_map[i * 5 + 2] = 0;
 285                 local_map[i * 5 + 3] = 0;
 286                 local_map[i * 5 + 4] = 0;
 287         }
 288
 289         /* initialize the parse data structures */
 290
 291         parse_setup(jd, &pd);
 292
 293         /* initialize local variables */
 294
 295         iptr = pd.instructions;
 296         ipc  = 0;
 297
 298         /* compute branch targets of exception table */
 299
 300         if (!new_fillextable(jd, m,
 301                         &(cd->exceptiontable[cd->exceptiontablelength-1]),
 302                         m->exceptiontable,
 303                         m->exceptiontablelength,
 304                         &b_count))
 305         {
 306                 return false;
 307         }
 308
 309         s_count = 1 + m->exceptiontablelength; /* initialize stack element counter   */
 310
 311 #if defined(ENABLE_THREADS)
 312         if (checksync && (m->flags & ACC_SYNCHRONIZED))
 313                 jd->isleafmethod = false;
 314 #endif
 315
 316         /* setup line number info */
 317
 318         currentline = 0;
 319         linepcchange = 0;
 320
 321         if (m->linenumbercount == 0) {
 322                 lineindex = 0;
 323         }
 324         else {
 325                 linepcchange = m->linenumbers[0].start_pc;
 326         }
 327
 328         /*** LOOP OVER ALL BYTECODE INSTRUCTIONS **********************************/
 329
 330         for (p = 0; p < m->jcodelength; p = nextp) {
 331
 332                 /* mark this position as a valid instruction start */
 333
 334                 pd.instructionstart[p] = 1;
 335
 336                 /* change the current line number, if necessary */
 337
 338                 /* XXX rewrite this using pointer arithmetic */
 339
 340                 if (linepcchange == p) {
 341                         if (m->linenumbercount > lineindex) {
 342 next_linenumber:
 343                                 currentline = m->linenumbers[lineindex].line_number;
 344                                 lineindex++;
 345                                 if (lineindex < m->linenumbercount) {
 346                                         linepcchange = m->linenumbers[lineindex].start_pc;
 347                                         if (linepcchange == p)
 348                                                 goto next_linenumber;
 349                                 }
 350                         }
 351                 }
 352
 353 fetch_opcode:
 354                 /* fetch next opcode  */
 355
 356                 opcode = SUCK_BE_U1(m->jcode + p);
 357
 358                 /* some compilers put a JAVA_NOP after a blockend instruction */
 359
 360                 if (blockend && (opcode != JAVA_NOP)) {
 361                         /* start new block */
 362
 363                         MARK_BASICBLOCK(p);
 364                         blockend = false;
 365                 }
 366
 367                 /* store intermediate instruction count (bit 0 mark block starts) */
 368
 369                 jd->new_basicblockindex[p] |= (ipc << 1);
 370
 371                 /* compute next instruction start */
 372
 373                 nextp = p + jcommandsize[opcode];
 374
 375                 CHECK_END_OF_BYTECODE(nextp);
 376
 377                 /* add stack elements produced by this instruction */
 378
 379                 s_count += stackreq[opcode];
 380
 381                 /* We check here for the space of 1 instruction in the
 382                    instruction array.  If an opcode is converted to more than
 383                    1 instruction, this is checked in the corresponding
 384                    case. */
 385
 386                 INSTRUCTIONS_CHECK(1);
 387
 388                 /* translate this bytecode instruction */
 389                 switch (opcode) {
 390
 391                 case JAVA_NOP:
 392                         break;
 393
 394                 /* pushing constants onto the stack ***********************************/
 395
 396                 case JAVA_BIPUSH:
 397                         OP_LOADCONST_I(SUCK_BE_S1(m->jcode + p + 1));
 398                         break;
 399
 400                 case JAVA_SIPUSH:
 401                         OP_LOADCONST_I(SUCK_BE_S2(m->jcode + p + 1));
 402                         break;
 403
 404                 case JAVA_LDC1:
 405                         i = SUCK_BE_U1(m->jcode + p + 1);
 406                         goto pushconstantitem;
 407
 408                 case JAVA_LDC2:
 409                 case JAVA_LDC2W:
 410                         i = SUCK_BE_U2(m->jcode + p + 1);
 411
 412                 pushconstantitem:
 413
 414 #if defined(ENABLE_VERIFIER)
 415                         if (i >= m->class->cpcount) {
 416                                 exceptions_throw_verifyerror(m,
 417                                         "Attempt to access constant outside range");
 418                                 return false;
 419                         }
 420 #endif
 421
 422                         switch (m->class->cptags[i]) {
 423                         case CONSTANT_Integer:
 424                                 OP_LOADCONST_I(((constant_integer *) (m->class->cpinfos[i]))->value);
 425                                 break;
 426                         case CONSTANT_Long:
 427                                 OP_LOADCONST_L(((constant_long *) (m->class->cpinfos[i]))->value);
 428                                 break;
 429                         case CONSTANT_Float:
 430                                 OP_LOADCONST_F(((constant_float *) (m->class->cpinfos[i]))->value);
 431                                 break;
 432                         case CONSTANT_Double:
 433                                 OP_LOADCONST_D(((constant_double *) (m->class->cpinfos[i]))->value);
 434                                 break;
 435                         case CONSTANT_String:
 436                                 OP_LOADCONST_STRING(literalstring_new((utf *) (m->class->cpinfos[i])));
 437                                 break;
 438                         case CONSTANT_Class:
 439                                 cr = (constant_classref *) (m->class->cpinfos[i]);
 440
 441                                 if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
 442                                         return false;
 443
 444                                 /* if not resolved, c == NULL */
 445
 446                                 OP_LOADCONST_CLASSINFO_OR_CLASSREF_CHECK(c, cr);
 447
 448                                 break;
 449
 450 #if defined(ENABLE_VERIFIER)
 451                         default:
 452                                 exceptions_throw_verifyerror(m,
 453                                                 "Invalid constant type to push");
 454                                 return false;
 455 #endif
 456                         }
 457                         break;
 458
 459                 case JAVA_ACONST_NULL:
 460                         OP_LOADCONST_NULL();
 461                         break;
 462
 463                 case JAVA_ICONST_M1:
 464                 case JAVA_ICONST_0:
 465                 case JAVA_ICONST_1:
 466                 case JAVA_ICONST_2:
 467                 case JAVA_ICONST_3:
 468                 case JAVA_ICONST_4:
 469                 case JAVA_ICONST_5:
 470                         OP_LOADCONST_I(opcode - JAVA_ICONST_0);
 471                         break;
 472
 473                 case JAVA_LCONST_0:
 474                 case JAVA_LCONST_1:
 475                         OP_LOADCONST_L(opcode - JAVA_LCONST_0);
 476                         break;
 477
 478                 case JAVA_FCONST_0:
 479                 case JAVA_FCONST_1:
 480                 case JAVA_FCONST_2:
 481                         OP_LOADCONST_F(opcode - JAVA_FCONST_0);
 482                         break;
 483
 484                 case JAVA_DCONST_0:
 485                 case JAVA_DCONST_1:
 486                         OP_LOADCONST_D(opcode - JAVA_DCONST_0);
 487                         break;
 488
 489                 /* stack operations ***************************************************/
 490
 491                 /* We need space for additional ICMDs so we can translate these       */
 492                 /* instructions to sequences of ICMD_COPY and ICMD_MOVE instructions. */
 493
 494                 case JAVA_DUP_X1:
 495                         INSTRUCTIONS_CHECK(3);
 496                         OP(opcode);
 497                         OP(ICMD_NOP);
 498                         OP(ICMD_NOP);
 499                         break;
 500
 501                 case JAVA_DUP_X2:
 502                         INSTRUCTIONS_CHECK(4);
 503                         OP(opcode);
 504                         OP(ICMD_NOP);
 505                         OP(ICMD_NOP);
 506                         OP(ICMD_NOP);
 507                         break;
 508
 509                 case JAVA_DUP2:
 510                         INSTRUCTIONS_CHECK(2);
 511                         OP(opcode);
 512                         OP(ICMD_NOP);
 513                         break;
 514
 515                 case JAVA_DUP2_X1:
 516                         INSTRUCTIONS_CHECK(5);
 517                         OP(opcode);
 518                         OP(ICMD_NOP);
 519                         OP(ICMD_NOP);
 520                         OP(ICMD_NOP);
 521                         OP(ICMD_NOP);
 522                         break;
 523
 524                 case JAVA_DUP2_X2:
 525                         INSTRUCTIONS_CHECK(6);
 526                         OP(opcode);
 527                         OP(ICMD_NOP);
 528                         OP(ICMD_NOP);
 529                         OP(ICMD_NOP);
 530                         OP(ICMD_NOP);
 531                         OP(ICMD_NOP);
 532                         break;
 533
 534                 case JAVA_SWAP:
 535                         INSTRUCTIONS_CHECK(2);
 536                         OP(opcode);
 537                         OP(ICMD_NOP);
 538                         break;
 539
 540                 /* local variable access instructions *********************************/
 541
 542                 case JAVA_ILOAD:
 543                 case JAVA_FLOAD:
 544                 case JAVA_ALOAD:
 545                         if (iswide == false) {
 546                                 i = SUCK_BE_U1(m->jcode + p + 1);
 547                         }
 548                         else {
 549                                 i = SUCK_BE_U2(m->jcode + p + 1);
 550                                 nextp = p + 3;
 551                                 iswide = false;
 552                         }
 553                         OP_LOAD_ONEWORD(opcode, i, opcode - JAVA_ILOAD);
 554                         break;
 555
 556                 case JAVA_LLOAD:
 557                 case JAVA_DLOAD:
 558                         if (iswide == false) {
 559                                 i = SUCK_BE_U1(m->jcode + p + 1);
 560                         }
 561                         else {
 562                                 i = SUCK_BE_U2(m->jcode + p + 1);
 563                                 nextp = p + 3;
 564                                 iswide = false;
 565                         }
 566                         OP_LOAD_TWOWORD(opcode, i, opcode - JAVA_ILOAD);
 567                         break;
 568
 569                 case JAVA_ILOAD_0:
 570                 case JAVA_ILOAD_1:
 571                 case JAVA_ILOAD_2:
 572                 case JAVA_ILOAD_3:
 573                         OP_LOAD_ONEWORD(ICMD_ILOAD, opcode - JAVA_ILOAD_0, TYPE_INT);
 574                         break;
 575
 576                 case JAVA_LLOAD_0:
 577                 case JAVA_LLOAD_1:
 578                 case JAVA_LLOAD_2:
 579                 case JAVA_LLOAD_3:
 580                         OP_LOAD_TWOWORD(ICMD_LLOAD, opcode - JAVA_LLOAD_0, TYPE_LNG);
 581                         break;
 582
 583                 case JAVA_FLOAD_0:
 584                 case JAVA_FLOAD_1:
 585                 case JAVA_FLOAD_2:
 586                 case JAVA_FLOAD_3:
 587                         OP_LOAD_ONEWORD(ICMD_FLOAD, opcode - JAVA_FLOAD_0, TYPE_FLT);
 588                         break;
 589
 590                 case JAVA_DLOAD_0:
 591                 case JAVA_DLOAD_1:
 592                 case JAVA_DLOAD_2:
 593                 case JAVA_DLOAD_3:
 594                         OP_LOAD_TWOWORD(ICMD_DLOAD, opcode - JAVA_DLOAD_0, TYPE_DBL);
 595                         break;
 596
 597                 case JAVA_ALOAD_0:
 598                 case JAVA_ALOAD_1:
 599                 case JAVA_ALOAD_2:
 600                 case JAVA_ALOAD_3:
 601                         OP_LOAD_ONEWORD(ICMD_ALOAD, opcode - JAVA_ALOAD_0, TYPE_ADR);
 602                         break;
 603
 604                 case JAVA_ISTORE:
 605                 case JAVA_FSTORE:
 606                 case JAVA_ASTORE:
 607                         if (iswide == false) {
 608                                 i = SUCK_BE_U1(m->jcode + p + 1);
 609                         }
 610                         else {
 611                                 i = SUCK_BE_U2(m->jcode + p + 1);
 612                                 iswide = false;
 613                                 nextp = p + 3;
 614                         }
 615                         OP_STORE_ONEWORD(opcode, i, opcode - JAVA_ISTORE);
 616                         break;
 617
 618                 case JAVA_LSTORE:
 619                 case JAVA_DSTORE:
 620                         if (iswide == false) {
 621                                 i = SUCK_BE_U1(m->jcode + p + 1);
 622                         }
 623                         else {
 624                                 i = SUCK_BE_U2(m->jcode + p + 1);
 625                                 iswide = false;
 626                                 nextp = p + 3;
 627                         }
 628                         OP_STORE_TWOWORD(opcode, i, opcode - JAVA_ISTORE);
 629                         break;
 630
 631                 case JAVA_ISTORE_0:
 632                 case JAVA_ISTORE_1:
 633                 case JAVA_ISTORE_2:
 634                 case JAVA_ISTORE_3:
 635                         OP_STORE_ONEWORD(ICMD_ISTORE, opcode - JAVA_ISTORE_0, TYPE_INT);
 636                         break;
 637
 638                 case JAVA_LSTORE_0:
 639                 case JAVA_LSTORE_1:
 640                 case JAVA_LSTORE_2:
 641                 case JAVA_LSTORE_3:
 642                         OP_STORE_TWOWORD(ICMD_LSTORE, opcode - JAVA_LSTORE_0, TYPE_LNG);
 643                         break;
 644
 645                 case JAVA_FSTORE_0:
 646                 case JAVA_FSTORE_1:
 647                 case JAVA_FSTORE_2:
 648                 case JAVA_FSTORE_3:
 649                         OP_STORE_ONEWORD(ICMD_FSTORE, opcode - JAVA_FSTORE_0, TYPE_FLT);
 650                         break;
 651
 652                 case JAVA_DSTORE_0:
 653                 case JAVA_DSTORE_1:
 654                 case JAVA_DSTORE_2:
 655                 case JAVA_DSTORE_3:
 656                         OP_STORE_TWOWORD(ICMD_DSTORE, opcode - JAVA_DSTORE_0, TYPE_DBL);
 657                         break;
 658
 659                 case JAVA_ASTORE_0:
 660                 case JAVA_ASTORE_1:
 661                 case JAVA_ASTORE_2:
 662                 case JAVA_ASTORE_3:
 663                         OP_STORE_ONEWORD(ICMD_ASTORE, opcode - JAVA_ASTORE_0, TYPE_ADR);
 664                         break;
 665
 666                 case JAVA_IINC:
 667                         {
 668                                 int v;
 669
 670                                 if (iswide == false) {
 671                                         i = SUCK_BE_U1(m->jcode + p + 1);
 672                                         v = SUCK_BE_S1(m->jcode + p + 2);
 673
 674                                 }
 675                                 else {
 676                                         i = SUCK_BE_U2(m->jcode + p + 1);
 677                                         v = SUCK_BE_S2(m->jcode + p + 3);
 678                                         iswide = false;
 679                                         nextp = p + 5;
 680                                 }
 681                                 INDEX_ONEWORD(i);
 682                                 LOCALTYPE_USED(i, TYPE_INT);
 683                                 OP_LOCALINDEX_I(opcode, i, v);
 684                         }
 685                         break;
 686
 687                 /* wider index for loading, storing and incrementing ******************/
 688
 689                 case JAVA_WIDE:
 690                         iswide = true;
 691                         p++;
 692                         goto fetch_opcode;
 693
 694                 /* managing arrays ****************************************************/
 695
 696                 case JAVA_NEWARRAY:
 697                         switch (SUCK_BE_S1(m->jcode + p + 1)) {
 698                         case 4:
 699                                 bte = builtintable_get_internal(BUILTIN_newarray_boolean);
 700                                 break;
 701                         case 5:
 702                                 bte = builtintable_get_internal(BUILTIN_newarray_char);
 703                                 break;
 704                         case 6:
 705                                 bte = builtintable_get_internal(BUILTIN_newarray_float);
 706                                 break;
 707                         case 7:
 708                                 bte = builtintable_get_internal(BUILTIN_newarray_double);
 709                                 break;
 710                         case 8:
 711                                 bte = builtintable_get_internal(BUILTIN_newarray_byte);
 712                                 break;
 713                         case 9:
 714                                 bte = builtintable_get_internal(BUILTIN_newarray_short);
 715                                 break;
 716                         case 10:
 717                                 bte = builtintable_get_internal(BUILTIN_newarray_int);
 718                                 break;
 719                         case 11:
 720                                 bte = builtintable_get_internal(BUILTIN_newarray_long);
 721                                 break;
 722 #if defined(ENABLE_VERIFIER)
 723                         default:
 724                                 exceptions_throw_verifyerror(m, "Invalid array-type to create");
 725                                 return false;
 726 #endif
 727                         }
 728                         OP_BUILTIN_CHECK_EXCEPTION(bte);
 729                         break;
 730
 731                 case JAVA_ANEWARRAY:
 732                         i = SUCK_BE_U2(m->jcode + p + 1);
 733                         compr = (constant_classref *) class_getconstant(m->class, i, CONSTANT_Class);
 734                         if (!compr)
 735                                 return false;
 736
 737                         if (!(cr = class_get_classref_multiarray_of(1, compr)))
 738                                 return false;
 739
 740                         if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
 741                                 return false;
 742
 743                         INSTRUCTIONS_CHECK(2);
 744                         OP_LOADCONST_CLASSINFO_OR_CLASSREF_NOCHECK(c, cr);
 745                         bte = builtintable_get_internal(BUILTIN_newarray);
 746                         OP_BUILTIN_CHECK_EXCEPTION(bte);
 747                         s_count++;
 748                         break;
 749
 750                 case JAVA_MULTIANEWARRAY:
 751                         jd->isleafmethod = false;
 752                         i = SUCK_BE_U2(m->jcode + p + 1);
 753                         j = SUCK_BE_U1(m->jcode + p + 3);
 754
 755                         cr = (constant_classref *) class_getconstant(m->class, i, CONSTANT_Class);
 756                         if (cr == NULL)
 757                                 return false;
 758
 759                         if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
 760                                 return false;
 761
 762                         /* if unresolved, c == NULL */
 763
 764                         iptr->s1.argcount = j;
 765                         OP_S3_CLASSINFO_OR_CLASSREF(opcode, c, cr, 0 /* flags */);
 766                         break;
 767
 768                 /* control flow instructions ******************************************/
 769
 770                 case JAVA_IFEQ:
 771                 case JAVA_IFLT:
 772                 case JAVA_IFLE:
 773                 case JAVA_IFNE:
 774                 case JAVA_IFGT:
 775                 case JAVA_IFGE:
 776                 case JAVA_IFNULL:
 777                 case JAVA_IFNONNULL:
 778                 case JAVA_IF_ICMPEQ:
 779                 case JAVA_IF_ICMPNE:
 780                 case JAVA_IF_ICMPLT:
 781                 case JAVA_IF_ICMPGT:
 782                 case JAVA_IF_ICMPLE:
 783                 case JAVA_IF_ICMPGE:
 784                 case JAVA_IF_ACMPEQ:
 785                 case JAVA_IF_ACMPNE:
 786                 case JAVA_GOTO:
 787                         i = p + SUCK_BE_S2(m->jcode + p + 1);
 788                         CHECK_BYTECODE_INDEX(i);
 789                         MARK_BASICBLOCK(i);
 790                         blockend = true;
 791                         OP_INSINDEX(opcode, i);
 792                         break;
 793
 794                 case JAVA_GOTO_W:
 795                         i = p + SUCK_BE_S4(m->jcode + p + 1);
 796                         CHECK_BYTECODE_INDEX(i);
 797                         MARK_BASICBLOCK(i);
 798                         blockend = true;
 799                         OP_INSINDEX(opcode, i);
 800                         break;
 801
 802                 case JAVA_JSR:
 803                         i = p + SUCK_BE_S2(m->jcode + p + 1);
 804 jsr_tail:
 805                         CHECK_BYTECODE_INDEX(i);
 806                         MARK_BASICBLOCK(i);
 807                         blockend = true;
 808                         OP_PREPARE_ZEROFLAGS(JAVA_JSR);
 809                         iptr->sx.s23.s3.jsrtarget.insindex = i;
 810                         PINC;
 811                         break;
 812
 813                 case JAVA_JSR_W:
 814                         i = p + SUCK_BE_S4(m->jcode + p + 1);
 815                         goto jsr_tail;
 816
 817                 case JAVA_RET:
 818                         if (iswide == false) {
 819                                 i = SUCK_BE_U1(m->jcode + p + 1);
 820                         }
 821                         else {
 822                                 i = SUCK_BE_U2(m->jcode + p + 1);
 823                                 nextp = p + 3;
 824                                 iswide = false;
 825                         }
 826                         blockend = true;
 827
 828                         OP_LOAD_ONEWORD(opcode, i, TYPE_ADR);
 829                         break;
 830
 831                 case JAVA_IRETURN:
 832                 case JAVA_LRETURN:
 833                 case JAVA_FRETURN:
 834                 case JAVA_DRETURN:
 835                 case JAVA_ARETURN:
 836                 case JAVA_RETURN:
 837                         blockend = true;
 838                         /* XXX ARETURN will need a flag in the typechecker */
 839                         OP(opcode);
 840                         break;
 841
 842                 case JAVA_ATHROW:
 843                         blockend = true;
 844                         /* XXX ATHROW will need a flag in the typechecker */
 845                         OP(opcode);
 846                         break;
 847
 848
 849                 /* table jumps ********************************************************/
 850
 851                 case JAVA_LOOKUPSWITCH:
 852                         {
 853                                 s4 num, j;
 854                                 lookup_target_t *lookup;
 855 #if defined(ENABLE_VERIFIER)
 856                                 s4 prevvalue = 0;
 857 #endif
 858                                 blockend = true;
 859                                 nextp = ALIGN((p + 1), 4);
 860
 861                                 CHECK_END_OF_BYTECODE(nextp + 8);
 862
 863                                 OP_PREPARE_ZEROFLAGS(opcode);
 864
 865                                 /* default target */
 866
 867                                 j = p + SUCK_BE_S4(m->jcode + nextp);
 868                                 iptr->sx.s23.s3.lookupdefault.insindex = j;
 869                                 nextp += 4;
 870                                 CHECK_BYTECODE_INDEX(j);
 871                                 MARK_BASICBLOCK(j);
 872
 873                                 /* number of pairs */
 874
 875                                 num = SUCK_BE_U4(m->jcode + nextp);
 876                                 iptr->sx.s23.s2.lookupcount = num;
 877                                 nextp += 4;
 878
 879                                 /* allocate the intermediate code table */
 880
 881                                 lookup = DMNEW(lookup_target_t, num);
 882                                 iptr->dst.lookup = lookup;
 883
 884                                 /* iterate over the lookup table */
 885
 886                                 CHECK_END_OF_BYTECODE(nextp + 8 * num);
 887
 888                                 for (i = 0; i < num; i++) {
 889                                         /* value */
 890
 891                                         j = SUCK_BE_S4(m->jcode + nextp);
 892                                         lookup->value = j;
 893
 894                                         nextp += 4;
 895
 896 #if defined(ENABLE_VERIFIER)
 897                                         /* check if the lookup table is sorted correctly */
 898
 899                                         if (i && (j <= prevvalue)) {
 900                                                 exceptions_throw_verifyerror(m, "Unsorted lookup switch");
 901                                                 return false;
 902                                         }
 903                                         prevvalue = j;
 904 #endif
 905                                         /* target */
 906
 907                                         j = p + SUCK_BE_S4(m->jcode + nextp);
 908                                         lookup->target.insindex = j;
 909                                         lookup++;
 910                                         nextp += 4;
 911                                         CHECK_BYTECODE_INDEX(j);
 912                                         MARK_BASICBLOCK(j);
 913                                 }
 914
 915                                 PINC;
 916                                 break;
 917                         }
 918
 919
 920                 case JAVA_TABLESWITCH:
 921                         {
 922                                 s4 num, j;
 923                                 s4 deftarget;
 924                                 branch_target_t *table;
 925
 926                                 blockend = true;
 927                                 nextp = ALIGN((p + 1), 4);
 928
 929                                 CHECK_END_OF_BYTECODE(nextp + 12);
 930
 931                                 OP_PREPARE_ZEROFLAGS(opcode);
 932
 933                                 /* default target */
 934
 935                                 deftarget = p + SUCK_BE_S4(m->jcode + nextp);
 936                                 nextp += 4;
 937                                 CHECK_BYTECODE_INDEX(deftarget);
 938                                 MARK_BASICBLOCK(deftarget);
 939
 940                                 /* lower bound */
 941
 942                                 j = SUCK_BE_S4(m->jcode + nextp);
 943                                 iptr->sx.s23.s2.tablelow = j;
 944                                 nextp += 4;
 945
 946                                 /* upper bound */
 947
 948                                 num = SUCK_BE_S4(m->jcode + nextp);
 949                                 iptr->sx.s23.s3.tablehigh = num;
 950                                 nextp += 4;
 951
 952                                 /* calculate the number of table entries */
 953
 954                                 num = num - j + 1;
 955
 956 #if defined(ENABLE_VERIFIER)
 957                                 if (num < 1) {
 958                                         exceptions_throw_verifyerror(m,
 959                                                         "invalid TABLESWITCH: upper bound < lower bound");
 960                                         return false;
 961                                 }
 962 #endif
 963                                 /* create the intermediate code table */
 964                                 /* the first entry is the default target */
 965
 966                                 table = MNEW(branch_target_t, 1 + num);
 967                                 iptr->dst.table = table;
 968                                 (table++)->insindex = deftarget;
 969
 970                                 /* iterate over the target table */
 971
 972                                 CHECK_END_OF_BYTECODE(nextp + 4 * num);
 973
 974                                 for (i = 0; i < num; i++) {
 975                                         j = p + SUCK_BE_S4(m->jcode + nextp);
 976                                         (table++)->insindex = j;
 977                                         nextp += 4;
 978                                         CHECK_BYTECODE_INDEX(j);
 979                                         MARK_BASICBLOCK(j);
 980                                 }
 981
 982                                 PINC;
 983                                 break;
 984                         }
 985
 986
 987                 /* load and store of object fields ************************************/
 988
 989                 case JAVA_AASTORE:
 990                         OP(opcode);
 991                         jd->isleafmethod = false;
 992                         break;
 993
 994                 case JAVA_GETSTATIC:
 995                 case JAVA_PUTSTATIC:
 996                 case JAVA_GETFIELD:
 997                 case JAVA_PUTFIELD:
 998                         {
 999                                 constant_FMIref  *fr;
1000                                 unresolved_field *uf;
1001
1002                                 i = SUCK_BE_U2(m->jcode + p + 1);
1003                                 fr = class_getconstant(m->class, i, CONSTANT_Fieldref);
1004                                 if (!fr)
1005                                         return false;
1006
1007                                 OP_PREPARE_ZEROFLAGS(opcode);
1008                                 iptr->sx.s23.s3.fmiref = fr;
1009
1010                                 /* only with -noverify, otherwise the typechecker does this */
1011
1012 #if defined(ENABLE_VERIFIER)
1013                                 if (!JITDATA_HAS_FLAG_VERIFY(jd)) {
1014 #endif
1015                                         result = new_resolve_field_lazy(iptr, m);
1016                                         if (result == resolveFailed)
1017                                                 return false;
1018
1019                                         if (result != resolveSucceeded) {
1020                                                 uf = new_create_unresolved_field(m->class, m, iptr);
1021
1022                                                 if (uf == NULL)
1023                                                         return false;
1024
1025                                                 /* store the unresolved_field pointer */
1026
1027                                                 iptr->sx.s23.s3.uf = uf;
1028                                                 iptr->flags.bits = INS_FLAG_UNRESOLVED;
1029                                         }
1030 #if defined(ENABLE_VERIFIER)
1031                                 }
1032 #endif
1033                                 PINC;
1034                         }
1035                         break;
1036
1037
1038                 /* method invocation **************************************************/
1039
1040                 case JAVA_INVOKESTATIC:
1041                         i = SUCK_BE_U2(m->jcode + p + 1);
1042                         mr = class_getconstant(m->class, i, CONSTANT_Methodref);
1043
1044                         if (mr == NULL)
1045                                 return false;
1046
1047                         md = mr->parseddesc.md;
1048
1049                         if (md->params == NULL)
1050                                 if (!descriptor_params_from_paramtypes(md, ACC_STATIC))
1051                                         return false;
1052
1053                         goto invoke_method;
1054
1055                 case JAVA_INVOKEINTERFACE:
1056                         i = SUCK_BE_U2(m->jcode + p + 1);
1057
1058                         mr = class_getconstant(m->class, i, CONSTANT_InterfaceMethodref);
1059
1060                         goto invoke_nonstatic_method;
1061
1062                 case JAVA_INVOKESPECIAL:
1063                 case JAVA_INVOKEVIRTUAL:
1064                         i = SUCK_BE_U2(m->jcode + p + 1);
1065                         mr = class_getconstant(m->class, i, CONSTANT_Methodref);
1066
1067 invoke_nonstatic_method:
1068                         if (mr == NULL)
1069                                 return false;
1070
1071                         md = mr->parseddesc.md;
1072
1073                         if (md->params == NULL)
1074                                 if (!descriptor_params_from_paramtypes(md, 0))
1075                                         return false;
1076
1077 invoke_method:
1078                         jd->isleafmethod = false;
1079
1080                         OP_PREPARE_ZEROFLAGS(opcode);
1081                         iptr->sx.s23.s3.fmiref = mr;
1082
1083                         /* only with -noverify, otherwise the typechecker does this */
1084
1085 #if defined(ENABLE_VERIFIER)
1086                         if (!JITDATA_HAS_FLAG_VERIFY(jd)) {
1087 #endif
1088                                 result = new_resolve_method_lazy(iptr, m);
1089                                 if (result == resolveFailed)
1090                                         return false;
1091
1092                                 if (result != resolveSucceeded) {
1093                                         um = new_create_unresolved_method(m->class, m, iptr);
1094
1095                                         if (!um)
1096                                                 return false;
1097
1098                                         /* store the unresolved_method pointer */
1099
1100                                         iptr->sx.s23.s3.um = um;
1101                                         iptr->flags.bits = INS_FLAG_UNRESOLVED;
1102                                 }
1103 #if defined(ENABLE_VERIFIER)
1104                         }
1105 #endif
1106                         PINC;
1107                         break;
1108
1109                 /* instructions taking class arguments ********************************/
1110
1111                 case JAVA_NEW:
1112                         i = SUCK_BE_U2(m->jcode + p + 1);
1113                         cr = (constant_classref *) class_getconstant(m->class, i, CONSTANT_Class);
1114                         if (!cr)
1115                                 return false;
1116
1117                         if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
1118                                 return false;
1119
1120                         INSTRUCTIONS_CHECK(2);
1121                         OP_LOADCONST_CLASSINFO_OR_CLASSREF_NOCHECK(c, cr);
1122                         bte = builtintable_get_internal(BUILTIN_new);
1123                         OP_BUILTIN_CHECK_EXCEPTION(bte);
1124                         s_count++;
1125                         break;
1126
1127                 case JAVA_CHECKCAST:
1128                         i = SUCK_BE_U2(m->jcode + p + 1);
1129                         cr = (constant_classref *) class_getconstant(m->class, i, CONSTANT_Class);
1130                         if (cr == NULL)
1131                                 return false;
1132
1133                         if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
1134                                 return false;
1135
1136                         if (cr->name->text[0] == '[') {
1137                                 /* array type cast-check */
1138                                 flags = INS_FLAG_ARRAY;
1139                                 jd->isleafmethod = false;
1140                         }
1141                         else {
1142                                 /* object type cast-check */
1143                                 flags = 0;
1144                         }
1145                         OP_S3_CLASSINFO_OR_CLASSREF(opcode, c, cr, flags);
1146                         break;
1147
1148                 case JAVA_INSTANCEOF:
1149                         i = SUCK_BE_U2(m->jcode + p + 1);
1150                         cr = (constant_classref *) class_getconstant(m->class, i, CONSTANT_Class);
1151                         if (cr == NULL)
1152                                 return false;
1153
1154                         if (!resolve_classref(m, cr, resolveLazy, true, true, &c))
1155                                 return false;
1156
1157                         if (cr->name->text[0] == '[') {
1158                                 /* array type cast-check */
1159                                 INSTRUCTIONS_CHECK(2);
1160                                 OP_LOADCONST_CLASSINFO_OR_CLASSREF_NOCHECK(c, cr);
1161                                 bte = builtintable_get_internal(BUILTIN_arrayinstanceof);
1162                                 OP_BUILTIN_NO_EXCEPTION(bte);
1163                                 s_count++;
1164                         }
1165                         else {
1166                                 /* object type cast-check */
1167                                 OP_S3_CLASSINFO_OR_CLASSREF(opcode, c, cr, 0 /* flags*/);
1168                         }
1169                         break;
1170
1171                 /* synchronization instructions ***************************************/
1172
1173                 case JAVA_MONITORENTER:
1174 #if defined(ENABLE_THREADS)
1175                         if (checksync) {
1176                                 bte = builtintable_get_internal(LOCK_monitor_enter);
1177                                 OP_BUILTIN_CHECK_EXCEPTION(bte);
1178                         }
1179                         else
1180 #endif
1181                         {
1182                                 OP(ICMD_CHECKNULL_POP);
1183                         }
1184                         break;
1185
1186                 case JAVA_MONITOREXIT:
1187 #if defined(ENABLE_THREADS)
1188                         if (checksync) {
1189                                 bte = builtintable_get_internal(LOCK_monitor_exit);
1190                                 OP_BUILTIN_CHECK_EXCEPTION(bte);
1191                         }
1192                         else
1193 #endif
1194                         {
1195                                 OP(ICMD_CHECKNULL_POP);
1196                         }
1197                         break;
1198
1199                 /* arithmetic instructions that may become builtin functions **********/
1200
1201                 case JAVA_IDIV:
1202 #if !SUPPORT_DIVISION
1203                         bte = builtintable_get_internal(BUILTIN_idiv);
1204                         OP_BUILTIN_ARITHMETIC(opcode, bte);
1205 #else
1206                         OP(opcode);
1207 #endif
1208                         break;
1209
1210                 case JAVA_IREM:
1211 #if !SUPPORT_DIVISION
1212                         bte = builtintable_get_internal(BUILTIN_irem);
1213                         OP_BUILTIN_ARITHMETIC(opcode, bte);
1214 #else
1215                         OP(opcode);
1216 #endif
1217                         break;
1218
1219                 case JAVA_LDIV:
1220 #if !(SUPPORT_DIVISION && SUPPORT_LONG && SUPPORT_LONG_DIV)
1221                         bte = builtintable_get_internal(BUILTIN_ldiv);
1222                         OP_BUILTIN_ARITHMETIC(opcode, bte);
1223 #else
1224                         OP(opcode);
1225 #endif
1226                         break;
1227
1228                 case JAVA_LREM:
1229 #if !(SUPPORT_DIVISION && SUPPORT_LONG && SUPPORT_LONG_DIV)
1230                         bte = builtintable_get_internal(BUILTIN_lrem);
1231                         OP_BUILTIN_ARITHMETIC(opcode, bte);
1232 #else
1233                         OP(opcode);
1234 #endif
1235                         break;
1236
1237                 case JAVA_FREM:
1238 #if defined(__I386__)
1239                         OP(opcode);
1240 #else
1241                         bte = builtintable_get_internal(BUILTIN_frem);
1242                         OP_BUILTIN_NO_EXCEPTION(bte);
1243 #endif
1244                         break;
1245
1246                 case JAVA_DREM:
1247 #if defined(__I386__)
1248                         OP(opcode);
1249 #else
1250                         bte = builtintable_get_internal(BUILTIN_drem);
1251                         OP_BUILTIN_NO_EXCEPTION(bte);
1252 #endif
1253                         break;
1254
1255                 case JAVA_F2I:
1256 #if defined(__ALPHA__)
1257                         if (!opt_noieee) {
1258                                 bte = builtintable_get_internal(BUILTIN_f2i);
1259                                 OP_BUILTIN_NO_EXCEPTION(bte);
1260                         }
1261                         else
1262 #endif
1263                         {
1264                                 OP(opcode);
1265                         }
1266                         break;
1267
1268                 case JAVA_F2L:
1269 #if defined(__ALPHA__)
1270                         if (!opt_noieee) {
1271                                 bte = builtintable_get_internal(BUILTIN_f2l);
1272                                 OP_BUILTIN_NO_EXCEPTION(bte);
1273                         }
1274                         else
1275 #endif
1276                         {
1277                                 OP(opcode);
1278                         }
1279                         break;
1280
1281                 case JAVA_D2I:
1282 #if defined(__ALPHA__)
1283                         if (!opt_noieee) {
1284                                 bte = builtintable_get_internal(BUILTIN_d2i);
1285                                 OP_BUILTIN_NO_EXCEPTION(bte);
1286                         }
1287                         else
1288 #endif
1289                         {
1290                                 OP(opcode);
1291                         }
1292                         break;
1293
1294                 case JAVA_D2L:
1295 #if defined(__ALPHA__)
1296                         if (!opt_noieee) {
1297                                 bte = builtintable_get_internal(BUILTIN_d2l);
1298                                 OP_BUILTIN_NO_EXCEPTION(bte);
1299                         }
1300                         else
1301 #endif
1302                         {
1303                                 OP(opcode);
1304                         }
1305                         break;
1306
1307                 /* invalid opcodes ****************************************************/
1308
1309                         /* check for invalid opcodes if the verifier is enabled */
1310 #if defined(ENABLE_VERIFIER)
1311                 case JAVA_BREAKPOINT:
1312                         exceptions_throw_verifyerror(m, "Quick instructions shouldn't appear, yet.");
1313                         return false;
1314
1315                 case 186: /* unused opcode */
1316                 case 203:
1317                 case 204:
1318                 case 205:
1319                 case 206:
1320                 case 207:
1321                 case 208:
1322                 case 209:
1323                 case 210:
1324                 case 211:
1325                 case 212:
1326                 case 213:
1327                 case 214:
1328                 case 215:
1329                 case 216:
1330                 case 217:
1331                 case 218:
1332                 case 219:
1333                 case 220:
1334                 case 221:
1335                 case 222:
1336                 case 223:
1337                 case 224:
1338                 case 225:
1339                 case 226:
1340                 case 227:
1341                 case 228:
1342                 case 229:
1343                 case 230:
1344                 case 231:
1345                 case 232:
1346                 case 233:
1347                 case 234:
1348                 case 235:
1349                 case 236:
1350                 case 237:
1351                 case 238:
1352                 case 239:
1353                 case 240:
1354                 case 241:
1355                 case 242:
1356                 case 243:
1357                 case 244:
1358                 case 245:
1359                 case 246:
1360                 case 247:
1361                 case 248:
1362                 case 249:
1363                 case 250:
1364                 case 251:
1365                 case 252:
1366                 case 253:
1367                 case 254:
1368                 case 255:
1369                         exceptions_throw_verifyerror(m, "Illegal opcode %d at instr %d\n",
1370                                                                                  opcode, ipc);
1371                         return false;
1372                         break;
1373 #endif /* defined(ENABLE_VERIFIER) */
1374
1375                 /* opcodes that don't require translation *****************************/
1376
1377                 default:
1378                         /* straight-forward translation to ICMD */
1379                         OP(opcode);
1380                         break;
1381
1382                 } /* end switch */
1383
1384                 /* verifier checks ****************************************************/
1385
1386 #if defined(ENABLE_VERIFIER)
1387                 /* If WIDE was used correctly, iswide should have been reset by now. */
1388                 if (iswide) {
1389                         exceptions_throw_verifyerror(m,
1390                                         "Illegal instruction: WIDE before incompatible opcode");
1391                         return false;
1392                 }
1393 #endif /* defined(ENABLE_VERIFIER) */
1394
1395         } /* end for */
1396
1397         /* add a NOP to the last basic block */
1398
1399         INSTRUCTIONS_CHECK(1);
1400         OP(ICMD_NOP);
1401
1402         /*** END OF LOOP **********************************************************/
1403
1404         /* assert that we did not write more ICMDs than allocated */
1405
1406         assert(ipc <= pd.instructionslength);
1407         assert(ipc == (iptr - pd.instructions));
1408
1409         /*** verifier checks ******************************************************/
1410
1411 #if defined(ENABLE_VERIFIER)
1412         if (p != m->jcodelength) {
1413                 exceptions_throw_verifyerror(m,
1414                                 "Command-sequence crosses code-boundary");
1415                 return false;
1416         }
1417
1418         if (!blockend) {
1419                 exceptions_throw_verifyerror(m, "Falling off the end of the code");
1420                 return false;
1421         }
1422 #endif /* defined(ENABLE_VERIFIER) */
1423
1424         /*** setup the methodinfo, allocate stack and basic blocks ****************/
1425
1426         /* adjust block count if target 0 is not first intermediate instruction */
1427
1428         if (!jd->new_basicblockindex[0] || (jd->new_basicblockindex[0] > 1))
1429                 b_count++;
1430
1431         /* copy local to method variables */
1432
1433         jd->new_instructions = pd.instructions;
1434         jd->new_instructioncount = ipc;
1435         jd->new_basicblockcount = b_count;
1436         jd->new_stackcount = s_count + jd->new_basicblockcount * m->maxstack; /* in-stacks */
1437
1438         /* allocate stack table */
1439
1440         jd->new_stack = DMNEW(stackelement, jd->new_stackcount);
1441
1442         /* build basic block list */
1443
1444         bptr = jd->new_basicblocks = DMNEW(basicblock, b_count + 1);    /* one more for end ipc */
1445
1446         /* zero out all basic block structures */
1447
1448         MZERO(bptr, basicblock, b_count + 1);
1449
1450         b_count = 0;
1451         jd->new_c_debug_nr = 0;
1452
1453         /* additional block if target 0 is not first intermediate instruction */
1454
1455         if (!jd->new_basicblockindex[0] || (jd->new_basicblockindex[0] > 1)) {
1456                 BASICBLOCK_INIT(bptr, m);
1457
1458                 bptr->iinstr = jd->new_instructions;
1459                 /* bptr->icount is set when the next block is allocated */
1460
1461                 bptr++;
1462                 b_count++;
1463                 bptr[-1].next = bptr;
1464         }
1465
1466         /* allocate blocks */
1467
1468         for (p = 0; p < m->jcodelength; p++) {
1469                 if (jd->new_basicblockindex[p] & 1) {
1470 #if defined(ENABLE_VERIFIER)
1471                         /* Check if this block starts at the beginning of an
1472                            instruction. */
1473
1474                         if (!pd.instructionstart[p]) {
1475                                 exceptions_throw_verifyerror(m,
1476                                                 "Branch into middle of instruction");
1477                                 return false;
1478                         }
1479 #endif
1480
1481                         /* allocate the block */
1482
1483                         BASICBLOCK_INIT(bptr, m);
1484
1485                         bptr->iinstr = jd->new_instructions + (jd->new_basicblockindex[p] >> 1);
1486                         if (b_count) {
1487                                 bptr[-1].icount = bptr->iinstr - bptr[-1].iinstr;
1488                         }
1489                         /* bptr->icount is set when the next block is allocated */
1490
1491                         jd->new_basicblockindex[p] = b_count;
1492
1493                         bptr++;
1494                         b_count++;
1495                         bptr[-1].next = bptr;
1496                 }
1497         }
1498
1499         /* set instruction count of last real block */
1500
1501         if (b_count) {
1502                 bptr[-1].icount = (jd->new_instructions + jd->new_instructioncount) - bptr[-1].iinstr;
1503         }
1504
1505         /* allocate additional block at end */
1506
1507         BASICBLOCK_INIT(bptr,m);
1508
1509         /* set basicblock pointers in exception table */
1510
1511         if (cd->exceptiontablelength > 0) {
1512                 cd->exceptiontable[cd->exceptiontablelength - 1].down = NULL;
1513         }
1514
1515         for (i = 0; i < cd->exceptiontablelength; ++i) {
1516                 p = cd->exceptiontable[i].startpc;
1517                 cd->exceptiontable[i].start = jd->new_basicblocks + jd->new_basicblockindex[p];
1518
1519                 p = cd->exceptiontable[i].endpc;
1520                 cd->exceptiontable[i].end = (p == m->jcodelength) ? (jd->new_basicblocks + jd->new_basicblockcount /*+ 1*/) : (jd->new_basicblocks + jd->new_basicblockindex[p]);
1521
1522                 p = cd->exceptiontable[i].handlerpc;
1523                 cd->exceptiontable[i].handler = jd->new_basicblocks + jd->new_basicblockindex[p];
1524         }
1525
1526         /* XXX activate this if you want to try inlining */
1527 #if 0
1528         for (i = 0; i < m->exceptiontablelength; ++i) {
1529                 p = m->exceptiontable[i].startpc;
1530                 m->exceptiontable[i].start = jd->new_basicblocks + jd->new_basicblockindex[p];
1531
1532                 p = m->exceptiontable[i].endpc;
1533                 m->exceptiontable[i].end = (p == m->jcodelength) ? (jd->new_basicblocks + jd->new_basicblockcount /*+ 1*/) : (jd->new_basicblocks + jd->new_basicblockindex[p]);
1534
1535                 p = m->exceptiontable[i].handlerpc;
1536                 m->exceptiontable[i].handler = jd->new_basicblocks + jd->new_basicblockindex[p];
1537         }
1538 #endif
1539
1540         jd->local_map = local_map;
1541
1542         /* calculate local variable renaming */
1543
1544         {
1545                 s4 nlocals = 0;
1546                 s4 i;
1547
1548                 s4 *mapptr;
1549
1550                 mapptr = local_map;
1551
1552                 /* iterate over local_map[0..m->maxlocals*5] and set all existing  */
1553                 /* index,type pairs (localmap[index*5+type]==1) to an unique value */
1554                 /* -> == new local var index */
1555                 for(i = 0; i < (cd->maxlocals * 5); i++, mapptr++) {
1556                         if (*mapptr)
1557                                 *mapptr = nlocals++;
1558                         else
1559                                 *mapptr = UNUSED;
1560                 }
1561
1562                 jd->localcount = nlocals;
1563                 /* if dropped varindices for temp stackslots get reused(?max 2*       */
1564                 /* m->maxstack elements for stack), nlocals + s_count would be        */
1565                 /* sufficient */
1566                 jd->varcount   = nlocals + s_count +
1567                         jd->new_basicblockcount * m->maxstack;        /* out-stacks */
1568
1569                 jd->vartop = nlocals;
1570                 jd->var = DMNEW(varinfo, jd->varcount);
1571                 MZERO(jd->var, varinfo, jd->varcount);
1572
1573                 /* set types of all Locals in jd->var */
1574                 for(mapptr = local_map, i = 0; i < (cd->maxlocals * 5); i++, mapptr++)
1575                         if (*mapptr != UNUSED)
1576                                 jd->var[*mapptr].type = i%5;
1577         }
1578
1579         /* everything's ok */
1580
1581         return true;
1582
1583         /*** goto labels for throwing verifier exceptions *************************/
1584
1585 #if defined(ENABLE_VERIFIER)
1586
1587 throw_unexpected_end_of_bytecode:
1588         exceptions_throw_verifyerror(m, "Unexpected end of bytecode");
1589         return false;
1590
1591 throw_invalid_bytecode_index:
1592         exceptions_throw_verifyerror(m, "Illegal target of branch instruction");
1593         return false;
1594
1595 throw_illegal_local_variable_number:
1596         exceptions_throw_verifyerror(m, "Illegal local variable number");
1597         return false;
1598
1599 #endif /* ENABLE_VERIFIER */
1600 }
1601
1602
1603 /*
1604  * These are local overrides for various environment variables in Emacs.
1605  * Please do not remove this and leave it at the end of the file, where
1606  * Emacs will automagically detect them.
1607  * ---------------------------------------------------------------------
1608  * Local variables:
1609  * mode: c
1610  * indent-tabs-mode: t
1611  * c-basic-offset: 4
1612  * tab-width: 4
1613  * End:
1614  * vim:noexpandtab:sw=4:ts=4:
1615  */