src/vm/jit/stack.c

   1 /* src/vm/jit/stack.c - stack analysis
   2
   3    Copyright (C) 1996-2005, 2006, 2007 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    $Id: stack.c 7736 2007-04-17 19:24:05Z edwin $
  26
  27 */
  28
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <limits.h>
  36
  37 #include "arch.h"
  38 #include "md-abi.h"
  39
  40 #include "mm/memory.h"
  41
  42 #include "native/native.h"
  43
  44 #include "toolbox/logging.h"
  45
  46 #include "vm/global.h"
  47 #include "vm/builtin.h"
  48 #include "vm/stringlocal.h"
  49 #include "vm/types.h"
  50
  51 #include "vm/jit/abi.h"
  52 #include "vm/jit/cfg.h"
  53 #include "vm/jit/codegen-common.h"
  54 #include "vm/jit/parse.h"
  55 #include "vm/jit/show.h"
  56
  57 #if defined(ENABLE_DISASSEMBLER)
  58 # include "vm/jit/disass.h"
  59 #endif
  60
  61 #include "vm/jit/jit.h"
  62 #include "vm/jit/stack.h"
  63
  64 #if defined(ENABLE_SSA)
  65 # include "vm/jit/optimizing/lsra.h"
  66 # include "vm/jit/optimizing/ssa.h"
  67 #elif defined(ENABLE_LSRA)
  68 # include "vm/jit/allocator/lsra.h"
  69 #endif
  70
  71 #include "vmcore/options.h"
  72 #include "vm/resolve.h"
  73
  74 #if defined(ENABLE_STATISTICS)
  75 # include "vmcore/statistics.h"
  76 #endif
  77
  78 /*#define STACK_VERBOSE*/
  79
  80
  81 /* macro for saving #ifdefs ***************************************************/
  82
  83 #if defined(ENABLE_STATISTICS)
  84 #define STATISTICS_STACKDEPTH_DISTRIBUTION(distr)                    \
  85     do {                                                             \
  86         if (opt_stat) {                                              \
  87             if (stackdepth >= 10)                                    \
  88                 count_store_depth[10]++;                             \
  89             else                                                     \
  90                 count_store_depth[stackdepth]++;                     \
  91         }                                                            \
  92     } while (0)
  93 #else /* !defined(ENABLE_STATISTICS) */
  94 #define STATISTICS_STACKDEPTH_DISTRIBUTION(distr)
  95 #endif
  96
  97
  98 #define MIN(a,b)  (((a) < (b)) ? (a) : (b))
  99
 100
 101 /* For returnAddresses we use a field of the typeinfo to store from which  */
 102 /* subroutine the returnAddress will return, if used.                      */
 103 /* XXX It would be nicer to use typeinfo.typeclass, but the verifier seems */
 104 /* to need it initialised to NULL. This should be investigated.            */
 105
 106 #if defined(ENABLE_VERIFIER)
 107 #define SBRSTART  typeinfo.elementclass.any
 108 #endif
 109
 110
 111 /* stackdata_t *****************************************************************
 112
 113    This struct holds internal data during stack analysis.
 114
 115 *******************************************************************************/
 116
 117 typedef struct stackdata_t stackdata_t;
 118
 119 struct stackdata_t {
 120     basicblock *bptr;             /* the current basic block being analysed   */
 121     stackptr new;                 /* next free stackelement                   */
 122     s4 vartop;                    /* next free variable index                 */
 123     s4 localcount;                /* number of locals (at the start of var)   */
 124     s4 varcount;                  /* maximum number of variables expected     */
 125         s4 varsallocated;             /* total number of variables allocated      */
 126         s4 maxlocals;                 /* max. number of Java locals               */
 127     varinfo *var;                 /* variable array (same as jd->var)         */
 128         s4 *javalocals;               /* map from Java locals to jd->var indices  */
 129         methodinfo *m;                /* the method being analysed                */
 130         jitdata *jd;                  /* current jitdata                          */
 131         basicblock *last_real_block;  /* the last block before the empty one      */
 132         bool repeat;                  /* if true, iterate the analysis again      */
 133         exception_entry **handlers;   /* exception handlers for the current block */
 134         exception_entry *extableend;  /* points to the last exception entry       */
 135         stackelement exstack;         /* instack for exception handlers           */
 136 };
 137
 138
 139 /* macros for allocating/releasing variable indices *****************/
 140
 141 #define GET_NEW_INDEX(sd, new_varindex)                              \
 142     do {                                                             \
 143         assert((sd).vartop < (sd).varcount);                         \
 144         (new_varindex) = ((sd).vartop)++;                            \
 145     } while (0)
 146
 147 /* Not implemented now - could be used to reuse varindices.         */
 148 /* Pay attention to not release a localvar once implementing it!    */
 149 #define RELEASE_INDEX(sd, varindex)
 150
 151 #define GET_NEW_VAR(sd, newvarindex, newtype)                        \
 152     do {                                                             \
 153         GET_NEW_INDEX((sd), (newvarindex));                          \
 154         (sd).var[newvarindex].type = (newtype);                      \
 155     } while (0)
 156
 157
 158 /* macros for querying variable properties **************************/
 159
 160 #define IS_INOUT(sp)                                                 \
 161     (sd.var[(sp)->varnum].flags & INOUT)
 162
 163 #define IS_PREALLOC(sp)                                              \
 164     (sd.var[(sp)->varnum].flags & PREALLOC)
 165
 166 #define IS_TEMPVAR(sp)                                                                                           \
 167     ( ((sp)->varnum >= sd.localcount)                                                            \
 168       && !(sd.var[(sp)->varnum].flags & (INOUT | PREALLOC)) )
 169
 170
 171 #define IS_LOCALVAR_SD(sd, sp)                                       \
 172          ((sp)->varnum < (sd).localcount)
 173
 174 #define IS_LOCALVAR(sp)                                              \
 175     IS_LOCALVAR_SD(sd, (sp))
 176
 177
 178 /* macros for setting variable properties ****************************/
 179
 180 #define SET_TEMPVAR(sp)                                              \
 181     do {                                                             \
 182         if (IS_LOCALVAR((sp))) {                                     \
 183             stack_change_to_tempvar(&sd, (sp), iptr);                \
 184         }                                                            \
 185         sd.var[(sp)->varnum].flags &= ~(INOUT | PREALLOC);           \
 186     } while (0);
 187
 188 #define SET_PREALLOC(sp)                                             \
 189     do {                                                             \
 190         assert(!IS_LOCALVAR((sp)));                                  \
 191         sd.var[(sp)->varnum].flags |= PREALLOC;                      \
 192     } while (0);
 193
 194
 195 /* macros for source operands ***************************************/
 196
 197 #define CLR_S1                                                       \
 198     (iptr->s1.varindex = -1)
 199
 200 #define USE_S1(type1)                                                \
 201     do {                                                             \
 202         REQUIRE(1);                                                  \
 203         CHECK_BASIC_TYPE(type1, curstack->type);                     \
 204         iptr->s1.varindex = curstack->varnum;                        \
 205     } while (0)
 206
 207 #define USE_S1_ANY                                                   \
 208     do {                                                             \
 209         REQUIRE(1);                                                  \
 210         iptr->s1.varindex = curstack->varnum;                        \
 211     } while (0)
 212
 213 #define USE_S1_S2(type1, type2)                                      \
 214     do {                                                             \
 215         REQUIRE(2);                                                  \
 216         CHECK_BASIC_TYPE(type1, curstack->prev->type);               \
 217         CHECK_BASIC_TYPE(type2, curstack->type);                     \
 218         iptr->sx.s23.s2.varindex = curstack->varnum;                 \
 219         iptr->s1.varindex = curstack->prev->varnum;                  \
 220     } while (0)
 221
 222 #define USE_S1_S2_ANY_ANY                                            \
 223     do {                                                             \
 224         REQUIRE(2);                                                  \
 225         iptr->sx.s23.s2.varindex = curstack->varnum;                 \
 226         iptr->s1.varindex = curstack->prev->varnum;                  \
 227     } while (0)
 228
 229 #define USE_S1_S2_S3(type1, type2, type3)                            \
 230     do {                                                             \
 231         REQUIRE(3);                                                  \
 232         CHECK_BASIC_TYPE(type1, curstack->prev->prev->type);         \
 233         CHECK_BASIC_TYPE(type2, curstack->prev->type);               \
 234         CHECK_BASIC_TYPE(type3, curstack->type);                     \
 235         iptr->sx.s23.s3.varindex = curstack->varnum;                 \
 236         iptr->sx.s23.s2.varindex = curstack->prev->varnum;           \
 237         iptr->s1.varindex = curstack->prev->prev->varnum;            \
 238     } while (0)
 239
 240 /* The POPANY macro does NOT check stackdepth, or set stackdepth!   */
 241 #define POPANY                                                       \
 242     do {                                                             \
 243         if (curstack->varkind == UNDEFVAR)                           \
 244             curstack->varkind = TEMPVAR;                             \
 245         curstack = curstack->prev;                                   \
 246     } while (0)
 247
 248 #define POP_S1(type1)                                                \
 249     do {                                                             \
 250         USE_S1(type1);                                               \
 251         if (curstack->varkind == UNDEFVAR)                           \
 252             curstack->varkind = TEMPVAR;                             \
 253         curstack = curstack->prev;                                   \
 254     } while (0)
 255
 256 #define POP_S1_ANY                                                   \
 257     do {                                                             \
 258         USE_S1_ANY;                                                  \
 259         if (curstack->varkind == UNDEFVAR)                           \
 260             curstack->varkind = TEMPVAR;                             \
 261         curstack = curstack->prev;                                   \
 262     } while (0)
 263
 264 #define POP_S1_S2(type1, type2)                                      \
 265     do {                                                             \
 266         USE_S1_S2(type1, type2);                                     \
 267         if (curstack->varkind == UNDEFVAR)                           \
 268             curstack->varkind = TEMPVAR;                             \
 269         if (curstack->prev->varkind == UNDEFVAR)                     \
 270             curstack->prev->varkind = TEMPVAR;                       \
 271         curstack = curstack->prev->prev;                             \
 272     } while (0)
 273
 274 #define POP_S1_S2_ANY_ANY                                            \
 275     do {                                                             \
 276         USE_S1_S2_ANY_ANY;                                           \
 277         if (curstack->varkind == UNDEFVAR)                           \
 278             curstack->varkind = TEMPVAR;                             \
 279         if (curstack->prev->varkind == UNDEFVAR)                     \
 280             curstack->prev->varkind = TEMPVAR;                       \
 281         curstack = curstack->prev->prev;                             \
 282     } while (0)
 283
 284 #define POP_S1_S2_S3(type1, type2, type3)                            \
 285     do {                                                             \
 286         USE_S1_S2_S3(type1, type2, type3);                           \
 287         if (curstack->varkind == UNDEFVAR)                           \
 288             curstack->varkind = TEMPVAR;                             \
 289         if (curstack->prev->varkind == UNDEFVAR)                     \
 290             curstack->prev->varkind = TEMPVAR;                       \
 291         if (curstack->prev->prev->varkind == UNDEFVAR)               \
 292             curstack->prev->prev->varkind = TEMPVAR;                 \
 293         curstack = curstack->prev->prev->prev;                       \
 294     } while (0)
 295
 296 #define CLR_SX                                                       \
 297     (iptr->sx.val.l = 0)
 298
 299
 300 /* macros for setting the destination operand ***********************/
 301
 302 #define CLR_DST                                                      \
 303     (iptr->dst.varindex = -1)
 304
 305 #define DST(typed, index)                                            \
 306     do {                                                             \
 307         NEWSTACKn((typed),(index));                                  \
 308         curstack->creator = iptr;                                    \
 309         iptr->dst.varindex = (index);                                \
 310     } while (0)
 311
 312 #define DST_LOCALVAR(typed, index)                                   \
 313     do {                                                             \
 314         NEWSTACK((typed), LOCALVAR, (index));                        \
 315         curstack->creator = iptr;                                    \
 316         iptr->dst.varindex = (index);                                \
 317     } while (0)
 318
 319
 320 /* macro for propagating constant values ****************************/
 321
 322 #if defined(ENABLE_VERIFIER)
 323 #define COPY_VAL_AND_TYPE_VAR(sv, dv)                                \
 324     do {                                                             \
 325         if (((dv)->type = (sv)->type) == TYPE_RET) {                 \
 326             (dv)->vv  = (sv)->vv;                                    \
 327             (dv)->SBRSTART = (sv)->SBRSTART;                         \
 328         }                                                            \
 329     } while (0)
 330 #else
 331 #define COPY_VAL_AND_TYPE_VAR(sv, dv)                                \
 332     do {                                                             \
 333         (dv)->type = (sv)->type;                                     \
 334         if (((dv)->type = (sv)->type) == TYPE_RET) {                 \
 335             (dv)->vv  = (sv)->vv;                                    \
 336         }                                                            \
 337     } while (0)
 338 #endif
 339
 340 #define COPY_VAL_AND_TYPE(sd, sindex, dindex)                        \
 341         COPY_VAL_AND_TYPE_VAR((sd).var + (sindex), (sd).var + (dindex))
 342
 343
 344 /* stack modelling macros *******************************************/
 345
 346 #define OP0_1(typed)                                                 \
 347     do {                                                             \
 348         CLR_S1;                                                      \
 349         GET_NEW_VAR(sd, new_index, (typed));                         \
 350         DST((typed), new_index);                                                                         \
 351         stackdepth++;                                                \
 352     } while (0)
 353
 354 #define OP1_0_ANY                                                    \
 355     do {                                                             \
 356         POP_S1_ANY;                                                  \
 357         CLR_DST;                                                     \
 358         stackdepth--;                                                \
 359     } while (0)
 360
 361 #define OP1_BRANCH(type1)                                            \
 362     do {                                                             \
 363         POP_S1(type1);                                               \
 364         stackdepth--;                                                \
 365     } while (0)
 366
 367 #define OP1_1(type1, typed)                                          \
 368     do {                                                             \
 369         POP_S1(type1);                                               \
 370         GET_NEW_VAR(sd, new_index, (typed));                         \
 371         DST(typed, new_index);                                       \
 372     } while (0)
 373
 374 #define OP2_1(type1, type2, typed)                                   \
 375     do {                                                             \
 376         POP_S1_S2(type1, type2);                                     \
 377         GET_NEW_VAR(sd, new_index, (typed));                         \
 378         DST(typed, new_index);                                       \
 379         stackdepth--;                                                \
 380     } while (0)
 381
 382 #define OP0_0                                                        \
 383     do {                                                             \
 384         CLR_S1;                                                      \
 385         CLR_DST;                                                     \
 386     } while (0)
 387
 388 #define OP0_BRANCH                                                   \
 389     do {                                                             \
 390         CLR_S1;                                                      \
 391     } while (0)
 392
 393 #define OP1_0(type1)                                                 \
 394     do {                                                             \
 395         POP_S1(type1);                                               \
 396         CLR_DST;                                                     \
 397         stackdepth--;                                                \
 398     } while (0)
 399
 400 #define OP2_0(type1, type2)                                          \
 401     do {                                                             \
 402         POP_S1_S2(type1, type2);                                     \
 403         CLR_DST;                                                     \
 404         stackdepth -= 2;                                             \
 405     } while (0)
 406
 407 #define OP2_BRANCH(type1, type2)                                     \
 408     do {                                                             \
 409         POP_S1_S2(type1, type2);                                     \
 410         stackdepth -= 2;                                             \
 411     } while (0)
 412
 413 #define OP2_0_ANY_ANY                                                \
 414     do {                                                             \
 415         POP_S1_S2_ANY_ANY;                                           \
 416         CLR_DST;                                                     \
 417         stackdepth -= 2;                                             \
 418     } while (0)
 419
 420 #define OP3_0(type1, type2, type3)                                   \
 421     do {                                                             \
 422         POP_S1_S2_S3(type1, type2, type3);                           \
 423         CLR_DST;                                                     \
 424         stackdepth -= 3;                                             \
 425     } while (0)
 426
 427 #define LOAD(type1, index)                                           \
 428     do {                                                             \
 429         DST_LOCALVAR(type1, index);                                  \
 430         stackdepth++;                                                \
 431     } while (0)
 432
 433 #define STORE(type1, index)                                          \
 434     do {                                                             \
 435         POP_S1(type1);                                               \
 436         stackdepth--;                                                \
 437     } while (0)
 438
 439
 440 /* macros for DUP elimination ***************************************/
 441
 442 /* XXX replace NEW_VAR with NEW_INDEX */
 443 #define DUP_SLOT(sp)                                                 \
 444     do {                                                             \
 445         GET_NEW_VAR(sd, new_index, (sp)->type);                      \
 446         COPY_VAL_AND_TYPE(sd, (sp)->varnum, new_index);              \
 447         NEWSTACK((sp)->type, TEMPVAR, new_index);                    \
 448     } while(0)
 449
 450 /* does not check input stackdepth */
 451 #define MOVE_UP(sp)                                                  \
 452     do {                                                             \
 453         iptr->opc = ICMD_MOVE;                                       \
 454         iptr->s1.varindex = (sp)->varnum;                            \
 455         DUP_SLOT(sp);                                                \
 456         curstack->creator = iptr;                                    \
 457         iptr->dst.varindex = curstack->varnum;                       \
 458         stackdepth++;                                                \
 459     } while (0)
 460
 461 /* does not check input stackdepth */
 462 #define COPY_UP(sp)                                                  \
 463     do {                                                             \
 464         SET_TEMPVAR((sp));                                           \
 465         iptr->opc = ICMD_COPY;                                       \
 466         iptr->s1.varindex = (sp)->varnum;                            \
 467         DUP_SLOT(sp);                                                \
 468         curstack->creator = iptr;                                    \
 469         iptr->dst.varindex = curstack->varnum;                       \
 470         stackdepth++;                                                \
 471     } while (0)
 472
 473 #define COPY_DOWN(s, d)                                              \
 474     do {                                                             \
 475         SET_TEMPVAR((s));                                            \
 476         iptr->opc = ICMD_COPY;                                       \
 477         iptr->s1.varindex = (s)->varnum;                             \
 478         iptr->dst.varindex = (d)->varnum;                            \
 479         (d)->creator = iptr;                                         \
 480     } while (0)
 481
 482 #define MOVE_TO_TEMP(sp)                                             \
 483     do {                                                             \
 484         GET_NEW_INDEX(sd, new_index);                                \
 485         iptr->opc = ICMD_MOVE;                                       \
 486         iptr->s1.varindex = (sp)->varnum;                            \
 487         iptr->dst.varindex = new_index;                              \
 488         COPY_VAL_AND_TYPE(sd, (sp)->varnum, new_index);              \
 489         (sp)->varnum = new_index;                                    \
 490                 (sp)->varkind = TEMPVAR;                                     \
 491     } while (0)
 492
 493 /* macros for branching / reaching basic blocks *********************/
 494
 495 #define BRANCH_TARGET(bt, tempbptr)                                  \
 496     do {                                                             \
 497         tempbptr = (bt).block;                                       \
 498         tempbptr = stack_mark_reached(&sd, tempbptr, curstack,       \
 499                                       stackdepth);                   \
 500         if (tempbptr == NULL)                                        \
 501             return false;                                            \
 502         (bt).block = tempbptr;                                       \
 503     } while (0)
 504
 505 #define BRANCH(tempbptr)                                             \
 506     BRANCH_TARGET(iptr->dst, tempbptr)
 507
 508
 509 /* forward declarations *******************************************************/
 510
 511 static void stack_create_invars(stackdata_t *sd, basicblock *b,
 512                                                                 stackptr curstack, int stackdepth);
 513 static void stack_create_invars_from_outvars(stackdata_t *sd, basicblock *b);
 514
 515 #if defined(STACK_VERBOSE)
 516 static void stack_verbose_show_varinfo(stackdata_t *sd, varinfo *v);
 517 static void stack_verbose_show_variable(stackdata_t *sd, s4 index);
 518 static void stack_verbose_show_block(stackdata_t *sd, basicblock *bptr);
 519 static void stack_verbose_block_enter(stackdata_t *sd, bool reanalyse);
 520 static void stack_verbose_block_exit(stackdata_t *sd, bool superblockend);
 521 static void stack_verbose_show_state(stackdata_t *sd, instruction *iptr,
 522                                                                          stackptr curstack);
 523 #endif
 524
 525
 526 /* stack_init ******************************************************************
 527
 528    Initialized the stack analysis subsystem (called by jit_init).
 529
 530 *******************************************************************************/
 531
 532 bool stack_init(void)
 533 {
 534         return true;
 535 }
 536
 537
 538 /* stack_grow_variable_array ***************************************************
 539
 540    Grow the variable array so the given number of additional variables fits in.
 541    The number is added to `varcount`, which is the maximum number of variables
 542    we expect to need at this point. The actual number of variables
 543    (`varsallocated`) may be larger than that, in order to avoid too many
 544    reallocations.
 545
 546    IN:
 547       sd...........stack analysis data
 548           num..........number of additional variables
 549
 550 *******************************************************************************/
 551
 552 static void stack_grow_variable_array(stackdata_t *sd, s4 num)
 553 {
 554         s4 newsize;
 555
 556         assert(num >= 0);
 557
 558         if (sd->varcount + num > sd->varsallocated) {
 559                 newsize = 2*sd->varsallocated + num;
 560
 561                 sd->var = DMREALLOC(sd->var, varinfo, sd->varsallocated, newsize);
 562                 MZERO(sd->var + sd->varsallocated, varinfo, (newsize - sd->varsallocated));
 563                 sd->varsallocated = newsize;
 564                 sd->jd->var = sd->var;
 565         }
 566
 567         sd->varcount += num;
 568         sd->jd->varcount += num;
 569
 570         assert(sd->varcount <= sd->varsallocated);
 571 }
 572
 573
 574 /* stack_append_block **********************************************************
 575
 576    Append the given block after the last real block of the method (before
 577    the pseudo-block at the end).
 578
 579    IN:
 580       sd...........stack analysis data
 581           b............the block to append
 582
 583 *******************************************************************************/
 584
 585 static void stack_append_block(stackdata_t *sd, basicblock *b)
 586 {
 587 #if defined(STACK_VERBOSE)
 588         printf("APPENDING BLOCK L%0d\n", b->nr);
 589 #endif
 590
 591         b->next = sd->last_real_block->next;
 592         sd->last_real_block->next = b;
 593         sd->last_real_block = b;
 594         b->nr = sd->jd->basicblockcount++;
 595         b->next->nr = b->nr + 1;
 596 }
 597
 598
 599 /* stack_clone_block ***********************************************************
 600
 601    Create a copy of the given block and insert it at the end of the method.
 602
 603    CAUTION: This function does not copy the any variables or the instruction
 604    list. It _does_, however, reserve space for the block's invars in the
 605    variable array.
 606
 607    IN:
 608       sd...........stack analysis data
 609           b............the block to clone
 610
 611    RETURN VALUE:
 612       a pointer to the copy
 613
 614 *******************************************************************************/
 615
 616 static basicblock * stack_clone_block(stackdata_t *sd, basicblock *b)
 617 {
 618         basicblock *clone;
 619
 620         clone = DNEW(basicblock);
 621         *clone  = *b;
 622
 623         clone->iinstr = NULL;
 624         clone->inlocals = NULL;
 625         clone->javalocals = NULL;
 626         clone->invars = NULL;
 627
 628         clone->original = (b->original) ? b->original : b;
 629         clone->copied_to = clone->original->copied_to;
 630         clone->original->copied_to = clone;
 631         clone->next = NULL;
 632         clone->flags = BBREACHED;
 633
 634         stack_append_block(sd, clone);
 635
 636         /* reserve space for the invars of the clone */
 637
 638         stack_grow_variable_array(sd, b->indepth);
 639
 640 #if defined(STACK_VERBOSE)
 641         printf("cloning block L%03d ------> L%03d\n", b->nr, clone->nr);
 642 #endif
 643
 644         return clone;
 645 }
 646
 647
 648 /* stack_create_locals *********************************************************
 649
 650    Create the local variables for the start of the given basic block.
 651
 652    IN:
 653       sd...........stack analysis data
 654           b............block to create the locals for
 655
 656 *******************************************************************************/
 657
 658 static void stack_create_locals(stackdata_t *sd, basicblock *b)
 659 {
 660         s4       i;
 661         s4      *jl;
 662         varinfo *dv;
 663
 664         /* copy the current state of the local variables */
 665         /* (one extra local is needed by the verifier)   */
 666
 667         dv = DMNEW(varinfo, sd->localcount + VERIFIER_EXTRA_LOCALS);
 668         b->inlocals = dv;
 669         for (i=0; i<sd->localcount; ++i)
 670                 *dv++ = sd->var[i];
 671
 672         /* the current map from java locals to cacao variables */
 673
 674         jl = DMNEW(s4, sd->maxlocals);
 675         b->javalocals = jl;
 676         MCOPY(jl, sd->javalocals, s4, sd->maxlocals);
 677 }
 678
 679
 680 /* stack_merge_locals **********************************************************
 681
 682    Merge local variables at the beginning of the given basic block.
 683
 684    IN:
 685       sd...........stack analysis data
 686           b............the block that is reached
 687
 688 *******************************************************************************/
 689
 690 static void stack_merge_locals(stackdata_t *sd, basicblock *b)
 691 {
 692         s4 i;
 693         varinfo *dv;
 694         varinfo *sv;
 695
 696         /* If a javalocal is mapped to different cacao locals along the */
 697         /* incoming control-flow edges, it becomes undefined.           */
 698
 699         for (i=0; i<sd->maxlocals; ++i) {
 700                 if (b->javalocals[i] != UNUSED && b->javalocals[i] != sd->javalocals[i]) {
 701                         b->javalocals[i] = UNUSED;
 702                         if (b->flags >= BBFINISHED)
 703                                 b->flags = BBTYPECHECK_REACHED;
 704                         if (b->nr <= sd->bptr->nr)
 705                                 sd->repeat = true;
 706                 }
 707         }
 708
 709 #if defined(ENABLE_VERIFIER)
 710         if (b->inlocals) {
 711                 for (i=0; i<sd->localcount; ++i) {
 712                         dv = b->inlocals + i;
 713                         sv = sd->var + i;
 714                         if ((sv->type == TYPE_RET && dv->type == TYPE_RET)
 715                                         && (sv->SBRSTART != dv->SBRSTART))
 716                         {
 717 #if defined(STACK_VERBOSE)
 718                                 printf("JSR MISMATCH: setting variable %d to VOID\n", i);
 719 #endif
 720                                 dv->type = TYPE_VOID;
 721                                 if (b->flags >= BBFINISHED)
 722                                         b->flags = BBTYPECHECK_REACHED;
 723                                 sd->repeat = true; /* This is very rare, so just repeat */
 724                         }
 725                 }
 726         }
 727 #endif /* defined(ENABLE_VERIFIER) */
 728 }
 729
 730
 731 /* stack_create_invars *********************************************************
 732
 733    Create the invars for the given basic block. Also make a copy of the locals.
 734
 735    IN:
 736       sd...........stack analysis data
 737           b............block to create the invars for
 738           curstack.....current stack top
 739           stackdepth...current stack depth
 740
 741    This function creates STACKDEPTH invars and sets their types to the
 742    types to the types of the corresponding slot in the current stack.
 743
 744 *******************************************************************************/
 745
 746 static void stack_create_invars(stackdata_t *sd, basicblock *b,
 747                                                                 stackptr curstack, int stackdepth)
 748 {
 749         stackptr sp;
 750         int i;
 751         int index;
 752         varinfo *dv;
 753         varinfo *sv;
 754
 755         assert(sd->vartop + stackdepth <= sd->varcount);
 756
 757         b->indepth = stackdepth;
 758         b->invars = DMNEW(s4, stackdepth);
 759
 760         /* allocate the variable indices */
 761         index = (sd->vartop += stackdepth);
 762
 763         i = stackdepth;
 764         for (sp = curstack; i--; sp = sp->prev) {
 765                 b->invars[i] = --index;
 766                 dv = sd->var + index;
 767                 sv = sd->var + sp->varnum;
 768                 dv->flags = INOUT;
 769                 COPY_VAL_AND_TYPE_VAR(sv, dv);
 770         }
 771
 772         stack_create_locals(sd, b);
 773 }
 774
 775
 776 /* stack_create_invars_from_outvars ********************************************
 777
 778    Create the invars for the given basic block. Also make a copy of the locals.
 779    Types are propagated from the outvars of the current block.
 780
 781    IN:
 782       sd...........stack analysis data
 783           b............block to create the invars for
 784
 785 *******************************************************************************/
 786
 787 static void stack_create_invars_from_outvars(stackdata_t *sd, basicblock *b)
 788 {
 789         int i;
 790         int n;
 791         varinfo *sv, *dv;
 792
 793         n = sd->bptr->outdepth;
 794         assert(sd->vartop + n <= sd->varcount);
 795
 796         b->indepth = n;
 797         b->invars = DMNEW(s4, n);
 798
 799         if (n) {
 800                 dv = sd->var + sd->vartop;
 801
 802                 /* allocate the invars */
 803
 804                 for (i=0; i<n; ++i, ++dv) {
 805                         sv = sd->var + sd->bptr->outvars[i];
 806                         b->invars[i] = sd->vartop++;
 807                         dv->flags = INOUT;
 808                         COPY_VAL_AND_TYPE_VAR(sv, dv);
 809                 }
 810         }
 811
 812         stack_create_locals(sd, b);
 813 }
 814
 815
 816 /* stack_check_invars **********************************************************
 817
 818    Check the current stack against the invars of the given basic block.
 819    Depth and types must match.
 820
 821    IN:
 822       sd...........stack analysis data
 823           b............block which invars to check against
 824           curstack.....current stack top
 825           stackdepth...current stack depth
 826
 827    RETURN VALUE:
 828       the destinaton block
 829           NULL.........a VerifyError has been thrown
 830
 831 *******************************************************************************/
 832
 833 static basicblock * stack_check_invars(stackdata_t *sd, basicblock *b,
 834                                                                            stackptr curstack, int stackdepth)
 835 {
 836         int i;
 837         stackptr sp;
 838         basicblock *orig;
 839         bool separable;
 840         varinfo *sv;
 841         varinfo *dv;
 842
 843 #if defined(STACK_VERBOSE)
 844         printf("stack_check_invars(L%03d)\n", b->nr);
 845 #endif
 846
 847         /* find original of b */
 848         if (b->original)
 849                 b = b->original;
 850         orig = b;
 851
 852 #if defined(STACK_VERBOSE)
 853         printf("original is L%03d\n", orig->nr);
 854 #endif
 855
 856         i = orig->indepth;
 857
 858 #if defined(ENABLE_VERIFIER)
 859         if (i != stackdepth) {
 860                 exceptions_throw_verifyerror(sd->m, "Stack depth mismatch");
 861                 return NULL;
 862         }
 863 #endif
 864
 865         do {
 866                 separable = false;
 867
 868 #if defined(STACK_VERBOSE)
 869                 printf("checking against ");
 870                 stack_verbose_show_block(sd, b); printf("\n");
 871 #endif
 872
 873                 sp = curstack;
 874                 for (i = orig->indepth; i--; sp = sp->prev) {
 875                         dv = sd->var + b->invars[i];
 876                         sv = sd->var + sp->varnum;
 877
 878 #if defined(ENABLE_VERIFIER)
 879                         if (dv->type != sp->type) {
 880                                 exceptions_throw_verifyerror_for_stack(sd->m, dv->type);
 881                                 return NULL;
 882                         }
 883 #endif
 884
 885                         if (sp->type == TYPE_RET) {
 886 #if defined(ENABLE_VERIFIER)
 887                                 if (dv->SBRSTART != sv->SBRSTART) {
 888                                         exceptions_throw_verifyerror(sd->m, "Mismatched stack types");
 889                                         return NULL;
 890                                 }
 891 #endif
 892                                 if (dv->vv.retaddr != sv->vv.retaddr) {
 893                                         separable = true;
 894                                         /* don't break! have to check the remaining stackslots */
 895                                 }
 896                         }
 897                 }
 898
 899                 if (b->inlocals) {
 900                         for (i=0; i<sd->localcount; ++i) {
 901                                 dv = b->inlocals + i;
 902                                 sv = sd->var + i;
 903                                 if (sv->type == TYPE_RET && dv->type == TYPE_RET) {
 904                                         if (
 905 #if defined(ENABLE_VERIFIER)
 906                                                         (sv->SBRSTART == dv->SBRSTART) &&
 907 #endif
 908                                                         (sv->vv.retaddr != dv->vv.retaddr))
 909                                         {
 910                                                 separable = true;
 911                                                 break;
 912                                         }
 913                                 }
 914                         }
 915                 }
 916
 917                 if (!separable) {
 918                         /* XXX cascading collapse? */
 919
 920                         stack_merge_locals(sd, b);
 921
 922 #if defined(STACK_VERBOSE)
 923                         printf("------> using L%03d\n", b->nr);
 924 #endif
 925                         return b;
 926                 }
 927         } while ((b = b->copied_to) != NULL);
 928
 929         b = stack_clone_block(sd, orig);
 930         if (!b)
 931                 return NULL;
 932
 933         stack_create_invars(sd, b, curstack, stackdepth);
 934         return b;
 935 }
 936
 937
 938 /* stack_check_invars_from_outvars *********************************************
 939
 940    Check the outvars of the current block against the invars of the given block.
 941    Depth and types must match.
 942
 943    IN:
 944       sd...........stack analysis data
 945           b............block which invars to check against
 946
 947    RETURN VALUE:
 948       the destinaton block
 949           NULL.........a VerifyError has been thrown
 950
 951 *******************************************************************************/
 952
 953 static basicblock * stack_check_invars_from_outvars(stackdata_t *sd, basicblock *b)
 954 {
 955         int i;
 956         int n;
 957         varinfo *sv, *dv;
 958         basicblock *orig;
 959         bool separable;
 960
 961 #if defined(STACK_VERBOSE)
 962         printf("stack_check_invars_from_outvars(L%03d)\n", b->nr);
 963 #endif
 964
 965         /* find original of b */
 966         if (b->original)
 967                 b = b->original;
 968         orig = b;
 969
 970 #if defined(STACK_VERBOSE)
 971         printf("original is L%03d\n", orig->nr);
 972 #endif
 973
 974         i = orig->indepth;
 975         n = sd->bptr->outdepth;
 976
 977 #if defined(ENABLE_VERIFIER)
 978         if (i != n) {
 979                 exceptions_throw_verifyerror(sd->m, "Stack depth mismatch");
 980                 return NULL;
 981         }
 982 #endif
 983
 984         do {
 985                 separable = false;
 986
 987 #if defined(STACK_VERBOSE)
 988                 printf("checking against ");
 989                 stack_verbose_show_block(sd, b); printf("\n");
 990 #endif
 991
 992                 if (n) {
 993                         dv = sd->var + b->invars[0];
 994
 995                         for (i=0; i<n; ++i, ++dv) {
 996                                 sv = sd->var + sd->bptr->outvars[i];
 997
 998 #if defined(ENABLE_VERIFIER)
 999                                 if (sv->type != dv->type) {
1000                                         exceptions_throw_verifyerror_for_stack(sd->m, dv->type);
1001                                         return NULL;
1002                                 }
1003 #endif
1004
1005                                 if (dv->type == TYPE_RET) {
1006 #if defined(ENABLE_VERIFIER)
1007                                         if (sv->SBRSTART != dv->SBRSTART) {
1008                                                 exceptions_throw_verifyerror(sd->m, "Mismatched stack types");
1009                                                 return NULL;
1010                                         }
1011 #endif
1012                                         if (sv->vv.retaddr != dv->vv.retaddr) {
1013                                                 separable = true;
1014                                                 /* don't break! have to check the remaining stackslots */
1015                                         }
1016                                 }
1017                         }
1018                 }
1019
1020                 if (b->inlocals) {
1021                         for (i=0; i<sd->localcount; ++i) {
1022                                 dv = b->inlocals + i;
1023                                 sv = sd->var + i;
1024                                 if (
1025 #if defined(ENABLE_VERIFIER)
1026                                                 (sv->SBRSTART == dv->SBRSTART) &&
1027 #endif
1028                                                 (sv->type == TYPE_RET && dv->type == TYPE_RET))
1029                                 {
1030                                         if (sv->vv.retaddr != dv->vv.retaddr) {
1031                                                 separable = true;
1032                                                 break;
1033                                         }
1034                                 }
1035                         }
1036                 }
1037
1038                 if (!separable) {
1039                         /* XXX cascading collapse? */
1040
1041                         stack_merge_locals(sd, b);
1042
1043 #if defined(STACK_VERBOSE)
1044                         printf("------> using L%03d\n", b->nr);
1045 #endif
1046                         return b;
1047                 }
1048         } while ((b = b->copied_to) != NULL);
1049
1050         b = stack_clone_block(sd, orig);
1051         if (!b)
1052                 return NULL;
1053
1054         stack_create_invars_from_outvars(sd, b);
1055         return b;
1056 }
1057
1058
1059 /* stack_create_instack ********************************************************
1060
1061    Create the instack of the current basic block.
1062
1063    IN:
1064       sd...........stack analysis data
1065
1066    RETURN VALUE:
1067       the current stack top at the start of the basic block.
1068
1069 *******************************************************************************/
1070
1071 static stackptr stack_create_instack(stackdata_t *sd)
1072 {
1073     stackptr sp;
1074         int depth;
1075         int index;
1076
1077         if ((depth = sd->bptr->indepth) == 0)
1078                 return NULL;
1079
1080     sp = (sd->new += depth);
1081
1082         while (depth--) {
1083                 sp--;
1084                 index = sd->bptr->invars[depth];
1085                 sp->varnum = index;
1086                 sp->type = sd->var[index].type;
1087                 sp->prev = sp - 1;
1088                 sp->creator = NULL;
1089                 sp->flags = 0;
1090                 sp->varkind = STACKVAR;
1091         }
1092         sp->prev = NULL;
1093
1094         /* return the top of the created stack */
1095         return sd->new - 1;
1096 }
1097
1098
1099 /* stack_mark_reached **********************************************************
1100
1101    Mark the given block reached and propagate the current stack and locals to
1102    it. This function specializes the target block, if necessary, and returns
1103    a pointer to the specialized target.
1104
1105    IN:
1106       sd...........stack analysis data
1107           b............the block to reach
1108           curstack.....the current stack top
1109           stackdepth...the current stack depth
1110
1111    RETURN VALUE:
1112       a pointer to (a specialized version of) the target
1113           NULL.........a VerifyError has been thrown
1114
1115 *******************************************************************************/
1116
1117 static basicblock *stack_mark_reached(stackdata_t *sd, basicblock *b, stackptr curstack, int stackdepth)
1118 {
1119         assert(b != NULL);
1120
1121 #if defined(STACK_VERBOSE)
1122         printf("stack_mark_reached(L%03d from L%03d)\n", b->nr, sd->bptr->nr);
1123 #endif
1124
1125         /* mark targets of backward branches */
1126
1127         if (b->nr <= sd->bptr->nr)
1128                 b->bitflags |= BBFLAG_REPLACEMENT;
1129
1130         if (b->flags < BBREACHED) {
1131                 /* b is reached for the first time. Create its invars. */
1132
1133 #if defined(STACK_VERBOSE)
1134                 printf("reached L%03d for the first time\n", b->nr);
1135 #endif
1136
1137                 stack_create_invars(sd, b, curstack, stackdepth);
1138
1139                 b->flags = BBREACHED;
1140
1141                 return b;
1142         }
1143         else {
1144                 /* b has been reached before. Check that its invars match. */
1145
1146                 return stack_check_invars(sd, b, curstack, stackdepth);
1147         }
1148 }
1149
1150
1151 /* stack_mark_reached_from_outvars *********************************************
1152
1153    Mark the given block reached and propagate the outvars of the current block
1154    and the current locals to it. This function specializes the target block,
1155    if necessary, and returns a pointer to the specialized target.
1156
1157    IN:
1158       sd...........stack analysis data
1159           b............the block to reach
1160
1161    RETURN VALUE:
1162       a pointer to (a specialized version of) the target
1163           NULL.........a VerifyError has been thrown
1164
1165 *******************************************************************************/
1166
1167 static basicblock *stack_mark_reached_from_outvars(stackdata_t *sd, basicblock *b)
1168 {
1169         assert(b != NULL);
1170
1171 #if defined(STACK_VERBOSE)
1172         printf("stack_mark_reached_from_outvars(L%03d from L%03d)\n", b->nr, sd->bptr->nr);
1173 #endif
1174
1175         /* mark targets of backward branches */
1176
1177         if (b->nr <= sd->bptr->nr)
1178                 b->bitflags |= BBFLAG_REPLACEMENT;
1179
1180         if (b->flags < BBREACHED) {
1181                 /* b is reached for the first time. Create its invars. */
1182
1183 #if defined(STACK_VERBOSE)
1184                 printf("reached L%03d for the first time\n", b->nr);
1185 #endif
1186
1187                 stack_create_invars_from_outvars(sd, b);
1188
1189                 b->flags = BBREACHED;
1190
1191                 return b;
1192         }
1193         else {
1194                 /* b has been reached before. Check that its invars match. */
1195
1196                 return stack_check_invars_from_outvars(sd, b);
1197         }
1198 }
1199
1200
1201 /* stack_reach_next_block ******************************************************
1202
1203    Mark the following block reached and propagate the outvars of the
1204    current block and the current locals to it.  This function
1205    specializes the target block, if necessary, and returns a pointer
1206    to the specialized target.
1207
1208    IN:
1209       sd...........stack analysis data
1210
1211    RETURN VALUE:
1212       a pointer to (a specialized version of) the following block
1213           NULL.........a VerifyError has been thrown
1214
1215 *******************************************************************************/
1216
1217 static bool stack_reach_next_block(stackdata_t *sd)
1218 {
1219         basicblock *tbptr;
1220         instruction *iptr;
1221
1222         tbptr = (sd->bptr->original) ? sd->bptr->original : sd->bptr;
1223         tbptr = stack_mark_reached_from_outvars(sd, tbptr->next);
1224
1225         if (tbptr == NULL)
1226                 return false;
1227
1228         if (tbptr != sd->bptr->next) {
1229 #if defined(STACK_VERBOSE)
1230                 printf("NEXT IS NON-CONSEQUITIVE L%03d\n", tbptr->nr);
1231 #endif
1232                 iptr = sd->bptr->iinstr + sd->bptr->icount - 1;
1233                 assert(iptr->opc == ICMD_NOP);
1234                 iptr->opc = ICMD_GOTO;
1235                 iptr->dst.block = tbptr;
1236
1237                 if (tbptr->flags < BBFINISHED)
1238                         sd->repeat = true; /* XXX check if we really need to repeat */
1239         }
1240
1241         return true;
1242 }
1243
1244
1245 /* stack_reach_handlers ********************************************************
1246
1247    Reach the exception handlers for the current block.
1248
1249    IN:
1250       sd...........stack analysis data
1251
1252    RETURN VALUE:
1253      true.........everything ok
1254          false........a VerifyError has been thrown
1255
1256 *******************************************************************************/
1257
1258 static bool stack_reach_handlers(stackdata_t *sd)
1259 {
1260         s4 i;
1261         basicblock *tbptr;
1262
1263 #if defined(STACK_VERBOSE)
1264         printf("reaching exception handlers...\n");
1265 #endif
1266
1267         for (i=0; sd->handlers[i]; ++i) {
1268                 tbptr = sd->handlers[i]->handler;
1269
1270                 tbptr->type = BBTYPE_EXH;
1271                 tbptr->predecessorcount = CFG_UNKNOWN_PREDECESSORS;
1272
1273                 /* reach (and specialize) the handler block */
1274
1275                 tbptr = stack_mark_reached(sd, tbptr, &(sd->exstack), 1);
1276
1277                 if (tbptr == NULL)
1278                         return false;
1279
1280                 sd->handlers[i]->handler = tbptr;
1281         }
1282
1283         return true;
1284 }
1285
1286
1287 /* stack_reanalyse_block  ******************************************************
1288
1289    Re-analyse the current block. This is called if either the block itself
1290    has already been analysed before, or the current block is a clone of an
1291    already analysed block, and this clone is reached for the first time.
1292    In the latter case, this function does all that is necessary for fully
1293    cloning the block (cloning the instruction list and variables, etc.).
1294
1295    IN:
1296       sd...........stack analysis data
1297
1298    RETURN VALUE:
1299      true.........everything ok
1300          false........a VerifyError has been thrown
1301
1302 *******************************************************************************/
1303
1304 #define RELOCATE(index)                                              \
1305     do {                                                             \
1306         if ((index) >= blockvarstart)                                \
1307             (index) += blockvarshift;                                \
1308         else if ((index) >= invarstart)                              \
1309             (index) += invarshift;                                   \
1310     } while (0)
1311
1312 bool stack_reanalyse_block(stackdata_t *sd)
1313 {
1314         instruction *iptr;
1315         basicblock *b;
1316         basicblock *orig;
1317         s4 len;
1318         s4 invarstart;
1319         s4 blockvarstart;
1320         s4 invarshift;
1321         s4 blockvarshift;
1322         s4 i, j;
1323         s4 *argp;
1324         branch_target_t *table;
1325         lookup_target_t *lookup;
1326         bool superblockend;
1327         bool cloneinstructions;
1328         exception_entry *ex;
1329
1330 #if defined(STACK_VERBOSE)
1331         stack_verbose_block_enter(sd, true);
1332 #endif
1333
1334         b = sd->bptr;
1335
1336         if (!b->iinstr) {
1337                 orig = b->original;
1338                 assert(orig != NULL);
1339
1340                 /* clone the instruction list */
1341
1342                 cloneinstructions = true;
1343
1344                 assert(orig->iinstr);
1345                 len = orig->icount;
1346                 iptr = DMNEW(instruction, len + 1);
1347
1348                 MCOPY(iptr, orig->iinstr, instruction, len);
1349                 iptr[len].opc = ICMD_NOP;
1350                 iptr[len].line = 0;
1351                 iptr[len].flags.bits = 0;
1352                 b->iinstr = iptr;
1353                 b->icount = ++len;
1354
1355                 /* reserve space for the clone's block variables */
1356
1357                 stack_grow_variable_array(sd, orig->varcount);
1358
1359                 /* we already have the invars set */
1360
1361                 assert(b->indepth == orig->indepth);
1362
1363                 /* calculate relocation shifts for invars and block variables */
1364
1365                 if (orig->indepth) {
1366                         invarstart = orig->invars[0];
1367                         invarshift = b->invars[0] - invarstart;
1368                 }
1369                 else {
1370                         invarstart = INT_MAX;
1371                         invarshift = 0;
1372                 }
1373                 blockvarstart = orig->varstart;
1374                 blockvarshift = sd->vartop - blockvarstart;
1375
1376                 /* copy block variables */
1377
1378                 b->varstart = sd->vartop;
1379                 b->varcount = orig->varcount;
1380                 sd->vartop += b->varcount;
1381                 MCOPY(sd->var + b->varstart, sd->var + orig->varstart, varinfo, b->varcount);
1382
1383                 /* copy outvars */
1384
1385                 b->outdepth = orig->outdepth;
1386                 b->outvars = DMNEW(s4, orig->outdepth);
1387                 MCOPY(b->outvars, orig->outvars, s4, orig->outdepth);
1388
1389                 /* clone exception handlers */
1390
1391                 for (i=0; sd->handlers[i]; ++i) {
1392                         ex = DNEW(exception_entry);
1393                         ex->handler = sd->handlers[i]->handler;
1394                         ex->start = b;
1395                         ex->end = b; /* XXX hack, see end of stack_analyse */
1396                         ex->catchtype = sd->handlers[i]->catchtype;
1397                         ex->down = NULL;
1398
1399                         assert(sd->extableend->down == NULL);
1400                         sd->extableend->down = ex;
1401                         sd->extableend = ex;
1402                         sd->jd->exceptiontablelength++;
1403
1404                         sd->handlers[i] = ex;
1405                 }
1406         }
1407         else {
1408                 cloneinstructions = false;
1409                 invarshift = 0;
1410                 blockvarshift = 0;
1411                 invarstart = sd->vartop;
1412                 blockvarstart = sd->vartop;
1413                 iptr = b->iinstr;
1414         }
1415
1416         if (b->original) {
1417                 /* find exception handlers for the cloned block */
1418                 len = 0;
1419                 ex = sd->jd->exceptiontable;
1420                 for (; ex != NULL; ex = ex->down) {
1421                         /* XXX the cloned exception handlers have identical */
1422                         /* start end end blocks.                            */
1423                         if ((ex->start == b) && (ex->end == b)) {
1424                                 sd->handlers[len++] = ex;
1425                         }
1426                 }
1427                 sd->handlers[len] = NULL;
1428         }
1429
1430 #if defined(STACK_VERBOSE)
1431         printf("invarstart = %d, blockvarstart = %d\n", invarstart, blockvarstart);
1432         printf("invarshift = %d, blockvarshift = %d\n", invarshift, blockvarshift);
1433 #endif
1434
1435         /* mark block as finished */
1436
1437         b->flags = BBFINISHED;
1438
1439         /* initialize locals at the start of this block */
1440
1441         if (b->inlocals)
1442                 MCOPY(sd->var, b->inlocals, varinfo, sd->localcount);
1443
1444         MCOPY(sd->javalocals, b->javalocals, s4, sd->maxlocals);
1445
1446         /* reach exception handlers for this block */
1447
1448         if (!stack_reach_handlers(sd))
1449                 return false;
1450
1451         superblockend = false;
1452
1453         for (len = b->icount; len--; iptr++) {
1454 #if defined(STACK_VERBOSE)
1455                 show_icmd(sd->jd, iptr, false, SHOW_STACK);
1456                 printf("\n");
1457 #endif
1458
1459                 switch (iptr->opc) {
1460                         case ICMD_RET:
1461                                 j = iptr->s1.varindex;
1462
1463 #if defined(ENABLE_VERIFIER)
1464                                 if (sd->var[j].type != TYPE_RET) {
1465                                         exceptions_throw_verifyerror(sd->m, "RET with non-returnAddress value");
1466                                         return false;
1467                                 }
1468 #endif
1469
1470                                 iptr->dst.block = stack_mark_reached_from_outvars(sd, sd->var[j].vv.retaddr);
1471                                 superblockend = true;
1472                                 break;
1473
1474                         case ICMD_JSR:
1475                                 iptr->sx.s23.s3.jsrtarget.block = stack_mark_reached_from_outvars(sd, iptr->sx.s23.s3.jsrtarget.block);
1476                                 RELOCATE(iptr->dst.varindex);
1477                                 superblockend = true;
1478                                 break;
1479
1480                         case ICMD_RETURN:
1481                                 superblockend = true;
1482                                 break;
1483
1484                         case ICMD_CHECKNULL:
1485                         case ICMD_PUTSTATICCONST:
1486                                 break;
1487
1488                         case ICMD_NOP:
1489                         case ICMD_IINC:
1490                                 break;
1491
1492                         case ICMD_GOTO:
1493                                 iptr->dst.block = stack_mark_reached_from_outvars(sd, iptr->dst.block);
1494                                 superblockend = true;
1495                                 break;
1496
1497                                 /* pop 0 push 1 const */
1498
1499                         case ICMD_ACONST:
1500                         case ICMD_ICONST:
1501                         case ICMD_LCONST:
1502                         case ICMD_FCONST:
1503                         case ICMD_DCONST:
1504
1505                                 /* pop 0 push 1 load */
1506
1507                         case ICMD_ILOAD:
1508                         case ICMD_LLOAD:
1509                         case ICMD_FLOAD:
1510                         case ICMD_DLOAD:
1511                         case ICMD_ALOAD:
1512                                 RELOCATE(iptr->dst.varindex);
1513                                 break;
1514
1515                                 /* pop 2 push 1 */
1516
1517                         case ICMD_IALOAD:
1518                         case ICMD_LALOAD:
1519                         case ICMD_FALOAD:
1520                         case ICMD_DALOAD:
1521                         case ICMD_AALOAD:
1522                         case ICMD_BALOAD:
1523                         case ICMD_CALOAD:
1524                         case ICMD_SALOAD:
1525                                 RELOCATE(iptr->sx.s23.s2.varindex);
1526                                 RELOCATE(iptr->s1.varindex);
1527                                 RELOCATE(iptr->dst.varindex);
1528                                 break;
1529
1530                                 /* pop 3 push 0 */
1531
1532                         case ICMD_IASTORE:
1533                         case ICMD_LASTORE:
1534                         case ICMD_FASTORE:
1535                         case ICMD_DASTORE:
1536                         case ICMD_AASTORE:
1537                         case ICMD_BASTORE:
1538                         case ICMD_CASTORE:
1539                         case ICMD_SASTORE:
1540                                 RELOCATE(iptr->sx.s23.s3.varindex);
1541                                 RELOCATE(iptr->sx.s23.s2.varindex);
1542                                 RELOCATE(iptr->s1.varindex);
1543                                 break;
1544
1545                                 /* pop 1 push 0 store */
1546
1547                         case ICMD_ISTORE:
1548                         case ICMD_LSTORE:
1549                         case ICMD_FSTORE:
1550                         case ICMD_DSTORE:
1551                         case ICMD_ASTORE:
1552                                 RELOCATE(iptr->s1.varindex);
1553
1554                                 j = iptr->dst.varindex;
1555                                 COPY_VAL_AND_TYPE(*sd, iptr->s1.varindex, j);
1556                                 i = iptr->sx.s23.s3.javaindex;
1557                                 if (iptr->flags.bits & INS_FLAG_RETADDR) {
1558                                         iptr->sx.s23.s2.retaddrnr =
1559                                                 UNUSED - (1 + sd->var[j].vv.retaddr->nr);
1560                                         sd->javalocals[i] = iptr->sx.s23.s2.retaddrnr;
1561                                 }
1562                                 else
1563                                         sd->javalocals[i] = j;
1564                                 if (iptr->flags.bits & INS_FLAG_KILL_PREV)
1565                                         sd->javalocals[i-1] = UNUSED;
1566                                 if (iptr->flags.bits & INS_FLAG_KILL_NEXT)
1567                                         sd->javalocals[i+1] = UNUSED;
1568                                 break;
1569
1570                                 /* pop 1 push 0 */
1571
1572                         case ICMD_ARETURN:
1573                         case ICMD_ATHROW:
1574                         case ICMD_IRETURN:
1575                         case ICMD_LRETURN:
1576                         case ICMD_FRETURN:
1577                         case ICMD_DRETURN:
1578                                 RELOCATE(iptr->s1.varindex);
1579                                 superblockend = true;
1580                                 break;
1581
1582                         case ICMD_PUTSTATIC:
1583                         case ICMD_PUTFIELDCONST:
1584                         case ICMD_POP:
1585                                 RELOCATE(iptr->s1.varindex);
1586                                 break;
1587
1588                                 /* pop 1 push 0 branch */
1589
1590                         case ICMD_IFNULL:
1591                         case ICMD_IFNONNULL:
1592
1593                         case ICMD_IFEQ:
1594                         case ICMD_IFNE:
1595                         case ICMD_IFLT:
1596                         case ICMD_IFGE:
1597                         case ICMD_IFGT:
1598                         case ICMD_IFLE:
1599
1600                         case ICMD_IF_LEQ:
1601                         case ICMD_IF_LNE:
1602                         case ICMD_IF_LLT:
1603                         case ICMD_IF_LGE:
1604                         case ICMD_IF_LGT:
1605                         case ICMD_IF_LLE:
1606                                 RELOCATE(iptr->s1.varindex);
1607                                 iptr->dst.block = stack_mark_reached_from_outvars(sd, iptr->dst.block);
1608                                 break;
1609
1610                                 /* pop 1 push 0 table branch */
1611
1612                         case ICMD_TABLESWITCH:
1613                                 i = iptr->sx.s23.s3.tablehigh - iptr->sx.s23.s2.tablelow + 1 + 1;
1614
1615                                 if (cloneinstructions) {
1616                                         table = DMNEW(branch_target_t, i);
1617                                         MCOPY(table, iptr->dst.table, branch_target_t, i);
1618                                         iptr->dst.table = table;
1619                                 }
1620                                 else {
1621                                         table = iptr->dst.table;
1622                                 }
1623
1624                                 RELOCATE(iptr->s1.varindex);
1625                                 while (i--) {
1626                                         table->block = stack_mark_reached_from_outvars(sd, table->block);
1627                                         table++;
1628                                 }
1629                                 superblockend = true;
1630                                 break;
1631
1632                         case ICMD_LOOKUPSWITCH:
1633                                 i = iptr->sx.s23.s2.lookupcount;
1634                                 if (cloneinstructions) {
1635                                         lookup = DMNEW(lookup_target_t, i);
1636                                         MCOPY(lookup, iptr->dst.lookup, lookup_target_t, i);
1637                                         iptr->dst.lookup = lookup;
1638                                 }
1639                                 else {
1640                                         lookup = iptr->dst.lookup;
1641                                 }
1642                                 RELOCATE(iptr->s1.varindex);
1643                                 while (i--) {
1644                                         lookup->target.block = stack_mark_reached_from_outvars(sd, lookup->target.block);
1645                                         lookup++;
1646                                 }
1647                                 iptr->sx.s23.s3.lookupdefault.block = stack_mark_reached_from_outvars(sd, iptr->sx.s23.s3.lookupdefault.block);
1648                                 superblockend = true;
1649                                 break;
1650
1651                         case ICMD_MONITORENTER:
1652                         case ICMD_MONITOREXIT:
1653                                 RELOCATE(iptr->s1.varindex);
1654                                 break;
1655
1656                                 /* pop 2 push 0 branch */
1657
1658                         case ICMD_IF_ICMPEQ:
1659                         case ICMD_IF_ICMPNE:
1660                         case ICMD_IF_ICMPLT:
1661                         case ICMD_IF_ICMPGE:
1662                         case ICMD_IF_ICMPGT:
1663                         case ICMD_IF_ICMPLE:
1664
1665                         case ICMD_IF_LCMPEQ:
1666                         case ICMD_IF_LCMPNE:
1667                         case ICMD_IF_LCMPLT:
1668                         case ICMD_IF_LCMPGE:
1669                         case ICMD_IF_LCMPGT:
1670                         case ICMD_IF_LCMPLE:
1671
1672                         case ICMD_IF_FCMPEQ:
1673                         case ICMD_IF_FCMPNE:
1674
1675                         case ICMD_IF_FCMPL_LT:
1676                         case ICMD_IF_FCMPL_GE:
1677                         case ICMD_IF_FCMPL_GT:
1678                         case ICMD_IF_FCMPL_LE:
1679
1680                         case ICMD_IF_FCMPG_LT:
1681                         case ICMD_IF_FCMPG_GE:
1682                         case ICMD_IF_FCMPG_GT:
1683                         case ICMD_IF_FCMPG_LE:
1684
1685                         case ICMD_IF_DCMPEQ:
1686                         case ICMD_IF_DCMPNE:
1687
1688                         case ICMD_IF_DCMPL_LT:
1689                         case ICMD_IF_DCMPL_GE:
1690                         case ICMD_IF_DCMPL_GT:
1691                         case ICMD_IF_DCMPL_LE:
1692
1693                         case ICMD_IF_DCMPG_LT:
1694                         case ICMD_IF_DCMPG_GE:
1695                         case ICMD_IF_DCMPG_GT:
1696                         case ICMD_IF_DCMPG_LE:
1697
1698                         case ICMD_IF_ACMPEQ:
1699                         case ICMD_IF_ACMPNE:
1700                                 RELOCATE(iptr->sx.s23.s2.varindex);
1701                                 RELOCATE(iptr->s1.varindex);
1702                                 iptr->dst.block = stack_mark_reached_from_outvars(sd, iptr->dst.block);
1703                                 break;
1704
1705                                 /* pop 2 push 0 */
1706
1707                         case ICMD_PUTFIELD:
1708                         case ICMD_IASTORECONST:
1709                         case ICMD_LASTORECONST:
1710                         case ICMD_AASTORECONST:
1711                         case ICMD_BASTORECONST:
1712                         case ICMD_CASTORECONST:
1713                         case ICMD_SASTORECONST:
1714                         case ICMD_POP2:
1715                                 RELOCATE(iptr->sx.s23.s2.varindex);
1716                                 RELOCATE(iptr->s1.varindex);
1717                                 break;
1718
1719                                 /* pop 0 push 1 copy */
1720
1721                         case ICMD_COPY:
1722                         case ICMD_MOVE:
1723                                 RELOCATE(iptr->dst.varindex);
1724                                 RELOCATE(iptr->s1.varindex);
1725                                 COPY_VAL_AND_TYPE(*sd, iptr->s1.varindex, iptr->dst.varindex);
1726                                 break;
1727
1728                                 /* pop 2 push 1 */
1729
1730                         case ICMD_IDIV:
1731                         case ICMD_IREM:
1732                         case ICMD_LDIV:
1733                         case ICMD_LREM:
1734                         case ICMD_IADD:
1735                         case ICMD_ISUB:
1736                         case ICMD_IMUL:
1737                         case ICMD_ISHL:
1738                         case ICMD_ISHR:
1739                         case ICMD_IUSHR:
1740                         case ICMD_IAND:
1741                         case ICMD_IOR:
1742                         case ICMD_IXOR:
1743                         case ICMD_LADD:
1744                         case ICMD_LSUB:
1745                         case ICMD_LMUL:
1746                         case ICMD_LOR:
1747                         case ICMD_LAND:
1748                         case ICMD_LXOR:
1749                         case ICMD_LSHL:
1750                         case ICMD_LSHR:
1751                         case ICMD_LUSHR:
1752                         case ICMD_FADD:
1753                         case ICMD_FSUB:
1754                         case ICMD_FMUL:
1755                         case ICMD_FDIV:
1756                         case ICMD_FREM:
1757                         case ICMD_DADD:
1758                         case ICMD_DSUB:
1759                         case ICMD_DMUL:
1760                         case ICMD_DDIV:
1761                         case ICMD_DREM:
1762                         case ICMD_LCMP:
1763                         case ICMD_FCMPL:
1764                         case ICMD_FCMPG:
1765                         case ICMD_DCMPL:
1766                         case ICMD_DCMPG:
1767                                 RELOCATE(iptr->sx.s23.s2.varindex);
1768                                 RELOCATE(iptr->s1.varindex);
1769                                 RELOCATE(iptr->dst.varindex);
1770                                 break;
1771
1772                                 /* pop 1 push 1 */
1773
1774                         case ICMD_CHECKCAST:
1775                         case ICMD_ARRAYLENGTH:
1776                         case ICMD_INSTANCEOF:
1777                         case ICMD_NEWARRAY:
1778                         case ICMD_ANEWARRAY:
1779                         case ICMD_GETFIELD:
1780                         case ICMD_IADDCONST:
1781                         case ICMD_ISUBCONST:
1782                         case ICMD_IMULCONST:
1783                         case ICMD_IMULPOW2:
1784                         case ICMD_IDIVPOW2:
1785                         case ICMD_IREMPOW2:
1786                         case ICMD_IANDCONST:
1787                         case ICMD_IORCONST:
1788                         case ICMD_IXORCONST:
1789                         case ICMD_ISHLCONST:
1790                         case ICMD_ISHRCONST:
1791                         case ICMD_IUSHRCONST:
1792                         case ICMD_LADDCONST:
1793                         case ICMD_LSUBCONST:
1794                         case ICMD_LMULCONST:
1795                         case ICMD_LMULPOW2:
1796                         case ICMD_LDIVPOW2:
1797                         case ICMD_LREMPOW2:
1798                         case ICMD_LANDCONST:
1799                         case ICMD_LORCONST:
1800                         case ICMD_LXORCONST:
1801                         case ICMD_LSHLCONST:
1802                         case ICMD_LSHRCONST:
1803                         case ICMD_LUSHRCONST:
1804                         case ICMD_INEG:
1805                         case ICMD_INT2BYTE:
1806                         case ICMD_INT2CHAR:
1807                         case ICMD_INT2SHORT:
1808                         case ICMD_LNEG:
1809                         case ICMD_FNEG:
1810                         case ICMD_DNEG:
1811                         case ICMD_I2L:
1812                         case ICMD_I2F:
1813                         case ICMD_I2D:
1814                         case ICMD_L2I:
1815                         case ICMD_L2F:
1816                         case ICMD_L2D:
1817                         case ICMD_F2I:
1818                         case ICMD_F2L:
1819                         case ICMD_F2D:
1820                         case ICMD_D2I:
1821                         case ICMD_D2L:
1822                         case ICMD_D2F:
1823                                 RELOCATE(iptr->s1.varindex);
1824                                 RELOCATE(iptr->dst.varindex);
1825                                 break;
1826
1827                                 /* pop 0 push 1 */
1828
1829                         case ICMD_GETSTATIC:
1830                         case ICMD_NEW:
1831                                 RELOCATE(iptr->dst.varindex);
1832                                 break;
1833
1834                                 /* pop many push any */
1835
1836                         case ICMD_INVOKESTATIC:
1837                         case ICMD_INVOKESPECIAL:
1838                         case ICMD_INVOKEVIRTUAL:
1839                         case ICMD_INVOKEINTERFACE:
1840                         case ICMD_BUILTIN:
1841                         case ICMD_MULTIANEWARRAY:
1842                                 i = iptr->s1.argcount;
1843                                 if (cloneinstructions) {
1844                                         argp = DMNEW(s4, i);
1845                                         MCOPY(argp, iptr->sx.s23.s2.args, s4, i);
1846                                         iptr->sx.s23.s2.args = argp;
1847                                 }
1848                                 else {
1849                                         argp = iptr->sx.s23.s2.args;
1850                                 }
1851
1852                                 while (--i >= 0) {
1853                                         RELOCATE(*argp);
1854                                         argp++;
1855                                 }
1856                                 RELOCATE(iptr->dst.varindex);
1857                                 break;
1858
1859                         default:
1860                                 exceptions_throw_internalerror("Unknown ICMD %d during stack re-analysis",
1861                                                                                            iptr->opc);
1862                                 return false;
1863                 } /* switch */
1864
1865 #if defined(STACK_VERBOSE)
1866                 show_icmd(sd->jd, iptr, false, SHOW_STACK);
1867                 printf("\n");
1868 #endif
1869         }
1870
1871         /* relocate outvars */
1872
1873         for (i=0; i<b->outdepth; ++i) {
1874                 RELOCATE(b->outvars[i]);
1875         }
1876
1877 #if defined(STACK_VERBOSE)
1878         stack_verbose_block_exit(sd, superblockend);
1879 #endif
1880
1881         /* propagate to the next block */
1882
1883         if (!superblockend)
1884                 if (!stack_reach_next_block(sd))
1885                         return false;
1886
1887         return true;
1888 }
1889
1890
1891 /* stack_change_to_tempvar *****************************************************
1892
1893    Change the given stackslot to a TEMPVAR. This includes creating a new
1894    temporary variable and changing the dst.varindex of the creator of the
1895    stacklot to the new variable index. If this stackslot has been passed
1896    through ICMDs between the point of its creation and the current point,
1897    then the variable index is also changed in these ICMDs.
1898
1899    IN:
1900       sd...........stack analysis data
1901           sp...........stackslot to change
1902           ilimit.......instruction up to which to look for ICMDs passing-through
1903                        the stackslot (exclusive). This may point exactly after the
1904                                    last instruction, in which case the search is done to the
1905                                    basic block end.
1906
1907 *******************************************************************************/
1908
1909 static void stack_change_to_tempvar(stackdata_t *sd, stackptr sp,
1910                                                                         instruction *ilimit)
1911 {
1912         s4 newindex;
1913         s4 oldindex;
1914         instruction *iptr;
1915         s4 depth;
1916         s4 i;
1917
1918         oldindex = sp->varnum;
1919
1920         /* create a new temporary variable */
1921
1922         GET_NEW_VAR(*sd, newindex, sp->type);
1923
1924         sd->var[newindex].flags = sp->flags;
1925
1926         /* change the stackslot */
1927
1928         sp->varnum = newindex;
1929         sp->varkind = TEMPVAR;
1930
1931         /* change the dst.varindex of the stackslot's creator */
1932
1933         if (sp->creator)
1934                 sp->creator->dst.varindex = newindex;
1935
1936         /* handle ICMDs this stackslot passed through, if any */
1937
1938         if (sp->flags & PASSTHROUGH) {
1939                 iptr = (sp->creator) ? (sp->creator + 1) : sd->bptr->iinstr;
1940
1941                 /* assert that the limit points to an ICMD, or after the last one */
1942
1943                 assert(ilimit >= sd->bptr->iinstr);
1944                 assert(ilimit <= sd->bptr->iinstr + sd->bptr->icount);
1945
1946                 /* find the stackdepth under sp plus one */
1947                 /* Note: This number is usually known when this function is called, */
1948                 /* but calculating it here is less error-prone and should not be    */
1949                 /* a performance problem.                                           */
1950
1951                 for (depth = 0; sp != NULL; sp = sp->prev)
1952                         depth++;
1953
1954                 /* iterate over all instructions in the range and replace */
1955
1956                 for (; iptr < ilimit; ++iptr) {
1957                         switch (iptr->opc) {
1958                                 case ICMD_INVOKESTATIC:
1959                                 case ICMD_INVOKESPECIAL:
1960                                 case ICMD_INVOKEVIRTUAL:
1961                                 case ICMD_INVOKEINTERFACE:
1962                                 case ICMD_BUILTIN:
1963                                         i = iptr->s1.argcount - depth;
1964                                         if (iptr->sx.s23.s2.args[i] == oldindex) {
1965                                                 iptr->sx.s23.s2.args[i] = newindex;
1966                                         }
1967                                         break;
1968                                 /* IMPORTANT: If any ICMD sets the PASSTHROUGH flag of a */
1969                                 /* stackslot, it must be added in this switch!           */
1970                         }
1971                 }
1972         }
1973 }
1974
1975
1976 /* stack_init_javalocals *******************************************************
1977
1978    Initialize the mapping from Java locals to cacao variables at method entry.
1979
1980    IN:
1981       sd...........stack analysis data
1982
1983 *******************************************************************************/
1984
1985 static void stack_init_javalocals(stackdata_t *sd)
1986 {
1987         s4         *jl;
1988         s4          t,i,j;
1989         methoddesc *md;
1990         jitdata    *jd;
1991
1992         jd = sd->jd;
1993
1994         jl = DMNEW(s4, sd->maxlocals);
1995         jd->basicblocks[0].javalocals = jl;
1996
1997         for (i=0; i<sd->maxlocals; ++i)
1998                 jl[i] = UNUSED;
1999
2000         md = jd->m->parseddesc;
2001         j = 0;
2002         for (i=0; i<md->paramcount; ++i) {
2003                 t = md->paramtypes[i].type;
2004                 jl[j] = jd->local_map[5*j + t];
2005                 j++;
2006                 if (IS_2_WORD_TYPE(t))
2007                         j++;
2008         }
2009 }
2010
2011
2012 /* stack_analyse ***************************************************************
2013
2014    Analyse_stack uses the intermediate code created by parse.c to
2015    build a model of the JVM operand stack for the current method.
2016
2017    The following checks are performed:
2018      - check for operand stack underflow (before each instruction)
2019      - check for operand stack overflow (after[1] each instruction)
2020      - check for matching stack depth at merging points
2021      - check for matching basic types[2] at merging points
2022      - check basic types for instruction input (except for BUILTIN*
2023            opcodes, INVOKE* opcodes and MULTIANEWARRAY)
2024
2025    [1]) Checking this after the instruction should be ok. parse.c
2026    counts the number of required stack slots in such a way that it is
2027    only vital that we don't exceed `maxstack` at basic block
2028    boundaries.
2029
2030    [2]) 'basic types' means the distinction between INT, LONG, FLOAT,
2031    DOUBLE and ADDRESS types. Subtypes of INT and different ADDRESS
2032    types are not discerned.
2033
2034 *******************************************************************************/
2035
2036 bool stack_analyse(jitdata *jd)
2037 {
2038         methodinfo   *m;              /* method being analyzed                    */
2039         registerdata *rd;
2040         stackdata_t   sd;
2041 #if defined(ENABLE_SSA)
2042         lsradata     *ls;
2043 #endif
2044         int           stackdepth;
2045         stackptr      curstack;       /* current stack top                        */
2046         stackptr      copy;
2047         int           opcode;         /* opcode of current instruction            */
2048         int           i, j;
2049         int           javaindex;
2050         int           len;            /* # of instructions after the current one  */
2051         bool          superblockend;  /* if true, no fallthrough to next block    */
2052         bool          deadcode;       /* true if no live code has been reached    */
2053         instruction  *iptr;           /* the current instruction                  */
2054         basicblock   *tbptr;
2055         basicblock   *original;
2056         exception_entry *ex;
2057
2058         stackptr     *last_store_boundary;
2059         stackptr      coalescing_boundary;
2060
2061         stackptr      src1, src2, src3, src4, dst1, dst2;
2062
2063         branch_target_t *table;
2064         lookup_target_t *lookup;
2065 #if defined(ENABLE_VERIFIER)
2066         int           expectedtype;   /* used by CHECK_BASIC_TYPE                 */
2067 #endif
2068         builtintable_entry *bte;
2069         methoddesc         *md;
2070         constant_FMIref    *fmiref;
2071 #if defined(ENABLE_STATISTICS)
2072         int           iteration_count;  /* number of iterations of analysis       */
2073 #endif
2074         int           new_index; /* used to get a new var index with GET_NEW_INDEX*/
2075
2076 #if defined(STACK_VERBOSE)
2077         show_method(jd, SHOW_PARSE);
2078 #endif
2079
2080         /* get required compiler data - initialization */
2081
2082         m    = jd->m;
2083         rd   = jd->rd;
2084 #if defined(ENABLE_SSA)
2085         ls   = jd->ls;
2086 #endif
2087
2088         /* initialize the stackdata_t struct */
2089
2090         sd.m = m;
2091         sd.jd = jd;
2092         sd.varcount = jd->varcount;
2093         sd.vartop =  jd->vartop;
2094         sd.localcount = jd->localcount;
2095         sd.var = jd->var;
2096         sd.varsallocated = sd.varcount;
2097         sd.maxlocals = m->maxlocals;
2098         sd.javalocals = DMNEW(s4, sd.maxlocals);
2099         sd.handlers = DMNEW(exception_entry *, jd->exceptiontablelength + 1);
2100
2101         /* prepare the variable for exception handler stacks               */
2102         /* (has been reserved by STACK_EXTRA_VARS, or VERIFIER_EXTRA_VARS) */
2103
2104         sd.exstack.type = TYPE_ADR;
2105         sd.exstack.prev = NULL;
2106         sd.exstack.varnum = sd.localcount;
2107         sd.var[sd.exstack.varnum].type = TYPE_ADR;
2108
2109 #if defined(ENABLE_LSRA)
2110         m->maxlifetimes = 0;
2111 #endif
2112
2113 #if defined(ENABLE_STATISTICS)
2114         iteration_count = 0;
2115 #endif
2116
2117         /* find the last real basic block */
2118
2119         sd.last_real_block = NULL;
2120         tbptr = jd->basicblocks;
2121         while (tbptr->next) {
2122                 sd.last_real_block = tbptr;
2123                 tbptr = tbptr->next;
2124         }
2125         assert(sd.last_real_block);
2126
2127         /* find the last exception handler */
2128
2129         if (jd->exceptiontablelength)
2130                 sd.extableend = jd->exceptiontable + jd->exceptiontablelength - 1;
2131         else
2132                 sd.extableend = NULL;
2133
2134         /* init jd->interface_map */
2135
2136         jd->maxinterfaces = m->maxstack;
2137         jd->interface_map = DMNEW(interface_info, m->maxstack * 5);
2138         for (i = 0; i < m->maxstack * 5; i++)
2139                 jd->interface_map[i].flags = UNUSED;
2140
2141         last_store_boundary = DMNEW(stackptr, m->maxlocals);
2142
2143         /* initialize flags and invars (none) of first block */
2144
2145         jd->basicblocks[0].flags = BBREACHED;
2146         jd->basicblocks[0].invars = NULL;
2147         jd->basicblocks[0].indepth = 0;
2148         jd->basicblocks[0].inlocals =
2149                 DMNEW(varinfo, jd->localcount + VERIFIER_EXTRA_LOCALS);
2150         MCOPY(jd->basicblocks[0].inlocals, jd->var, varinfo,
2151                         jd->localcount + VERIFIER_EXTRA_LOCALS);
2152
2153         /* initialize java local mapping of first block */
2154
2155         stack_init_javalocals(&sd);
2156
2157         /* stack analysis loop (until fixpoint reached) **************************/
2158
2159         do {
2160 #if defined(ENABLE_STATISTICS)
2161                 iteration_count++;
2162 #endif
2163
2164                 /* initialize loop over basic blocks */
2165
2166                 sd.bptr       = jd->basicblocks;
2167                 superblockend = true;
2168                 sd.repeat     = false;
2169                 curstack      = NULL;
2170                 stackdepth    = 0;
2171                 deadcode      = true;
2172
2173                 /* iterate over basic blocks *****************************************/
2174
2175                 for (; sd.bptr; sd.bptr = sd.bptr->next) {
2176
2177                         if (sd.bptr->flags == BBDELETED) {
2178                                 /* This block has been deleted - do nothing. */
2179
2180                                 continue;
2181                         }
2182
2183                         if (sd.bptr->flags == BBTYPECHECK_REACHED) {
2184                                 /* re-analyse a block because its input changed */
2185
2186                                 deadcode = false;
2187
2188                                 if (!stack_reanalyse_block(&sd))
2189                                         return false;
2190
2191                                 superblockend = true; /* XXX */
2192                                 continue;
2193                         }
2194
2195                         if (superblockend && (sd.bptr->flags < BBREACHED)) {
2196                                 /* This block has not been reached so far, and we
2197                                    don't fall into it, so we'll have to iterate
2198                                    again. */
2199
2200                                 sd.repeat = true;
2201                                 continue;
2202                         }
2203
2204                         if (sd.bptr->flags > BBREACHED) {
2205                                 /* This block is already finished. */
2206
2207                                 superblockend = true;
2208                                 continue;
2209                         }
2210
2211                         if (sd.bptr->original && sd.bptr->original->flags < BBFINISHED) {
2212                                 /* This block is a clone and the original has not been
2213                                    analysed, yet. Analyse it on the next
2214                                    iteration. */
2215
2216                                 sd.repeat = true;
2217                                 /* XXX superblockend? */
2218                                 continue;
2219                         }
2220
2221                         /* This block has to be analysed now. */
2222
2223                         deadcode = false;
2224
2225                         /* XXX The rest of this block is still indented one level too */
2226                         /* much in order to avoid a giant diff by changing that.      */
2227
2228                                 /* We know that sd.bptr->flags == BBREACHED. */
2229                                 /* This block has been reached before.    */
2230
2231                                 assert(sd.bptr->flags == BBREACHED);
2232                                 stackdepth = sd.bptr->indepth;
2233
2234                                 /* find exception handlers for this block */
2235
2236                                 /* determine the active exception handlers for this block */
2237                                 /* XXX could use a faster algorithm with sorted lists or  */
2238                                 /* something?                                             */
2239
2240                                 original = (sd.bptr->original) ? sd.bptr->original : sd.bptr;
2241
2242                                 len = 0;
2243                                 ex = jd->exceptiontable;
2244                                 for (; ex != NULL; ex = ex->down) {
2245                                         if ((ex->start <= original) && (ex->end > original)) {
2246                                                 sd.handlers[len++] = ex;
2247                                         }
2248                                 }
2249                                 sd.handlers[len] = NULL;
2250
2251
2252                                 /* reanalyse cloned block */
2253
2254                                 if (sd.bptr->original) {
2255                                         if (!stack_reanalyse_block(&sd))
2256                                                 return false;
2257                                         continue;
2258                                 }
2259
2260                                 /* reset the new pointer for allocating stackslots */
2261
2262                                 sd.new = jd->stack;
2263
2264                                 /* create the instack of this block */
2265
2266                                 curstack = stack_create_instack(&sd);
2267
2268                                 /* initialize locals at the start of this block */
2269
2270                                 if (sd.bptr->inlocals)
2271                                         MCOPY(sd.var, sd.bptr->inlocals, varinfo, sd.localcount);
2272
2273                                 MCOPY(sd.javalocals, sd.bptr->javalocals, s4, sd.maxlocals);
2274
2275                                 /* set up local variables for analyzing this block */
2276
2277                                 superblockend = false;
2278                                 len = sd.bptr->icount;
2279                                 iptr = sd.bptr->iinstr;
2280
2281                                 /* mark the block as analysed */
2282
2283                                 sd.bptr->flags = BBFINISHED;
2284
2285                                 /* reset variables for dependency checking */
2286
2287                                 coalescing_boundary = sd.new;
2288                                 for( i = 0; i < m->maxlocals; i++)
2289                                         last_store_boundary[i] = sd.new;
2290
2291                                 /* remember the start of this block's variables */
2292
2293                                 sd.bptr->varstart = sd.vartop;
2294
2295 #if defined(STACK_VERBOSE)
2296                                 stack_verbose_block_enter(&sd, false);
2297 #endif
2298
2299                                 /* reach exception handlers for this block */
2300
2301                                 if (!stack_reach_handlers(&sd))
2302                                         return false;
2303
2304                                 /* iterate over ICMDs ****************************************/
2305
2306                                 while (--len >= 0)  {
2307
2308 #if defined(STACK_VERBOSE)
2309                                         stack_verbose_show_state(&sd, iptr, curstack);
2310 #endif
2311
2312                                         /* fetch the current opcode */
2313
2314                                         opcode = iptr->opc;
2315
2316                                         /* automatically replace some ICMDs with builtins */
2317
2318                                         bte = builtintable_get_automatic(opcode);
2319
2320                                         if ((bte != NULL) && (bte->opcode == opcode)) {
2321                                                 iptr->opc            = ICMD_BUILTIN;
2322                                                 iptr->flags.bits    &= INS_FLAG_ID_MASK;
2323                                                 iptr->sx.s23.s3.bte  = bte;
2324                                                 /* iptr->line is already set */
2325                                                 jd->isleafmethod     = false;
2326                                                 goto icmd_BUILTIN;
2327                                         }
2328
2329                                         /* main opcode switch *************************************/
2330
2331                                         switch (opcode) {
2332
2333                                                 /* pop 0 push 0 */
2334
2335                                         case ICMD_NOP:
2336 icmd_NOP:
2337                                                 CLR_SX;
2338                                                 OP0_0;
2339                                                 break;
2340
2341                                         case ICMD_CHECKNULL:
2342                                                 coalescing_boundary = sd.new;
2343                                                 COUNT(count_check_null);
2344                                                 USE_S1(TYPE_ADR);
2345                                                 CLR_SX;
2346                                                 iptr->dst.varindex = iptr->s1.varindex;
2347                                                 break;
2348
2349                                         case ICMD_RET:
2350                                                 j = iptr->s1.varindex =
2351                                                         jd->local_map[iptr->s1.varindex * 5 + TYPE_ADR];
2352
2353 #if defined(ENABLE_VERIFIER)
2354                                                 if (sd.var[j].type != TYPE_RET) {
2355                                                         exceptions_throw_verifyerror(m, "RET with non-returnAddress value");
2356                                                         return false;
2357                                                 }
2358 #endif
2359
2360                                                 CLR_SX;
2361
2362                                                 iptr->dst.block = stack_mark_reached(&sd, sd.var[j].vv.retaddr, curstack, stackdepth);
2363                                                 superblockend = true;
2364                                                 break;
2365
2366                                         case ICMD_RETURN:
2367                                                 COUNT(count_pcmd_return);
2368                                                 CLR_SX;
2369                                                 OP0_0;
2370                                                 superblockend = true;
2371                                                 sd.jd->returncount++;
2372                                                 sd.jd->returnblock = sd.bptr;
2373                                                 break;
2374
2375
2376                                                 /* pop 0 push 1 const */
2377
2378         /************************** ICONST OPTIMIZATIONS **************************/
2379
2380                                         case ICMD_ICONST:
2381                                                 COUNT(count_pcmd_load);
2382                                                 if (len == 0)
2383                                                         goto normal_ICONST;
2384
2385                                                 switch (iptr[1].opc) {
2386                                                         case ICMD_IADD:
2387                                                                 iptr->opc = ICMD_IADDCONST;
2388                                                                 /* FALLTHROUGH */
2389
2390                                                         icmd_iconst_tail:
2391                                                                 iptr[1].opc = ICMD_NOP;
2392                                                                 OP1_1(TYPE_INT, TYPE_INT);
2393                                                                 COUNT(count_pcmd_op);
2394                                                                 break;
2395
2396                                                         case ICMD_ISUB:
2397                                                                 iptr->opc = ICMD_ISUBCONST;
2398                                                                 goto icmd_iconst_tail;
2399 #if SUPPORT_CONST_MUL
2400                                                         case ICMD_IMUL:
2401                                                                 iptr->opc = ICMD_IMULCONST;
2402                                                                 goto icmd_iconst_tail;
2403 #else /* SUPPORT_CONST_MUL */
2404                                                         case ICMD_IMUL:
2405                                                                 if (iptr->sx.val.i == 0x00000002)
2406                                                                         iptr->sx.val.i = 1;
2407                                                                 else if (iptr->sx.val.i == 0x00000004)
2408                                                                         iptr->sx.val.i = 2;
2409                                                                 else if (iptr->sx.val.i == 0x00000008)
2410                                                                         iptr->sx.val.i = 3;
2411                                                                 else if (iptr->sx.val.i == 0x00000010)
2412                                                                         iptr->sx.val.i = 4;
2413                                                                 else if (iptr->sx.val.i == 0x00000020)
2414                                                                         iptr->sx.val.i = 5;
2415                                                                 else if (iptr->sx.val.i == 0x00000040)
2416                                                                         iptr->sx.val.i = 6;
2417                                                                 else if (iptr->sx.val.i == 0x00000080)
2418                                                                         iptr->sx.val.i = 7;
2419                                                                 else if (iptr->sx.val.i == 0x00000100)
2420                                                                         iptr->sx.val.i = 8;
2421                                                                 else if (iptr->sx.val.i == 0x00000200)
2422                                                                         iptr->sx.val.i = 9;
2423                                                                 else if (iptr->sx.val.i == 0x00000400)
2424                                                                         iptr->sx.val.i = 10;
2425                                                                 else if (iptr->sx.val.i == 0x00000800)
2426                                                                         iptr->sx.val.i = 11;
2427                                                                 else if (iptr->sx.val.i == 0x00001000)
2428                                                                         iptr->sx.val.i = 12;
2429                                                                 else if (iptr->sx.val.i == 0x00002000)
2430                                                                         iptr->sx.val.i = 13;
2431                                                                 else if (iptr->sx.val.i == 0x00004000)
2432                                                                         iptr->sx.val.i = 14;
2433                                                                 else if (iptr->sx.val.i == 0x00008000)
2434                                                                         iptr->sx.val.i = 15;
2435                                                                 else if (iptr->sx.val.i == 0x00010000)
2436                                                                         iptr->sx.val.i = 16;
2437                                                                 else if (iptr->sx.val.i == 0x00020000)
2438                                                                         iptr->sx.val.i = 17;
2439                                                                 else if (iptr->sx.val.i == 0x00040000)
2440                                                                         iptr->sx.val.i = 18;
2441                                                                 else if (iptr->sx.val.i == 0x00080000)
2442                                                                         iptr->sx.val.i = 19;
2443                                                                 else if (iptr->sx.val.i == 0x00100000)
2444                                                                         iptr->sx.val.i = 20;
2445                                                                 else if (iptr->sx.val.i == 0x00200000)
2446                                                                         iptr->sx.val.i = 21;
2447                                                                 else if (iptr->sx.val.i == 0x00400000)
2448                                                                         iptr->sx.val.i = 22;
2449                                                                 else if (iptr->sx.val.i == 0x00800000)
2450                                                                         iptr->sx.val.i = 23;
2451                                                                 else if (iptr->sx.val.i == 0x01000000)
2452                                                                         iptr->sx.val.i = 24;
2453                                                                 else if (iptr->sx.val.i == 0x02000000)
2454                                                                         iptr->sx.val.i = 25;
2455                                                                 else if (iptr->sx.val.i == 0x04000000)
2456                                                                         iptr->sx.val.i = 26;
2457                                                                 else if (iptr->sx.val.i == 0x08000000)
2458                                                                         iptr->sx.val.i = 27;
2459                                                                 else if (iptr->sx.val.i == 0x10000000)
2460                                                                         iptr->sx.val.i = 28;
2461                                                                 else if (iptr->sx.val.i == 0x20000000)
2462                                                                         iptr->sx.val.i = 29;
2463                                                                 else if (iptr->sx.val.i == 0x40000000)
2464                                                                         iptr->sx.val.i = 30;
2465                                                                 else if (iptr->sx.val.i == 0x80000000)
2466                                                                         iptr->sx.val.i = 31;
2467                                                                 else
2468                                                                         goto normal_ICONST;
2469
2470                                                                 iptr->opc = ICMD_IMULPOW2;
2471                                                                 goto icmd_iconst_tail;
2472 #endif /* SUPPORT_CONST_MUL */
2473                                                         case ICMD_IDIV:
2474                                                                 if (iptr->sx.val.i == 0x00000002)
2475                                                                         iptr->sx.val.i = 1;
2476                                                                 else if (iptr->sx.val.i == 0x00000004)
2477                                                                         iptr->sx.val.i = 2;
2478                                                                 else if (iptr->sx.val.i == 0x00000008)
2479                                                                         iptr->sx.val.i = 3;
2480                                                                 else if (iptr->sx.val.i == 0x00000010)
2481                                                                         iptr->sx.val.i = 4;
2482                                                                 else if (iptr->sx.val.i == 0x00000020)
2483                                                                         iptr->sx.val.i = 5;
2484                                                                 else if (iptr->sx.val.i == 0x00000040)
2485                                                                         iptr->sx.val.i = 6;
2486                                                                 else if (iptr->sx.val.i == 0x00000080)
2487                                                                         iptr->sx.val.i = 7;
2488                                                                 else if (iptr->sx.val.i == 0x00000100)
2489                                                                         iptr->sx.val.i = 8;
2490                                                                 else if (iptr->sx.val.i == 0x00000200)
2491                                                                         iptr->sx.val.i = 9;
2492                                                                 else if (iptr->sx.val.i == 0x00000400)
2493                                                                         iptr->sx.val.i = 10;
2494                                                                 else if (iptr->sx.val.i == 0x00000800)
2495                                                                         iptr->sx.val.i = 11;
2496                                                                 else if (iptr->sx.val.i == 0x00001000)
2497                                                                         iptr->sx.val.i = 12;
2498                                                                 else if (iptr->sx.val.i == 0x00002000)
2499                                                                         iptr->sx.val.i = 13;
2500                                                                 else if (iptr->sx.val.i == 0x00004000)
2501                                                                         iptr->sx.val.i = 14;
2502                                                                 else if (iptr->sx.val.i == 0x00008000)
2503                                                                         iptr->sx.val.i = 15;
2504                                                                 else if (iptr->sx.val.i == 0x00010000)
2505                                                                         iptr->sx.val.i = 16;
2506                                                                 else if (iptr->sx.val.i == 0x00020000)
2507                                                                         iptr->sx.val.i = 17;
2508                                                                 else if (iptr->sx.val.i == 0x00040000)
2509                                                                         iptr->sx.val.i = 18;
2510                                                                 else if (iptr->sx.val.i == 0x00080000)
2511                                                                         iptr->sx.val.i = 19;
2512                                                                 else if (iptr->sx.val.i == 0x00100000)
2513                                                                         iptr->sx.val.i = 20;
2514                                                                 else if (iptr->sx.val.i == 0x00200000)
2515                                                                         iptr->sx.val.i = 21;
2516                                                                 else if (iptr->sx.val.i == 0x00400000)
2517                                                                         iptr->sx.val.i = 22;
2518                                                                 else if (iptr->sx.val.i == 0x00800000)
2519                                                                         iptr->sx.val.i = 23;
2520                                                                 else if (iptr->sx.val.i == 0x01000000)
2521                                                                         iptr->sx.val.i = 24;
2522                                                                 else if (iptr->sx.val.i == 0x02000000)
2523                                                                         iptr->sx.val.i = 25;
2524                                                                 else if (iptr->sx.val.i == 0x04000000)
2525                                                                         iptr->sx.val.i = 26;
2526                                                                 else if (iptr->sx.val.i == 0x08000000)
2527                                                                         iptr->sx.val.i = 27;
2528                                                                 else if (iptr->sx.val.i == 0x10000000)
2529                                                                         iptr->sx.val.i = 28;
2530                                                                 else if (iptr->sx.val.i == 0x20000000)
2531                                                                         iptr->sx.val.i = 29;
2532                                                                 else if (iptr->sx.val.i == 0x40000000)
2533                                                                         iptr->sx.val.i = 30;
2534                                                                 else if (iptr->sx.val.i == 0x80000000)
2535                                                                         iptr->sx.val.i = 31;
2536                                                                 else
2537                                                                         goto normal_ICONST;
2538
2539                                                                 iptr->opc = ICMD_IDIVPOW2;
2540                                                                 goto icmd_iconst_tail;
2541
2542                                                         case ICMD_IREM:
2543                                                                 /*log_text("stack.c: ICMD_ICONST/ICMD_IREM");*/
2544                                                                 if ((iptr->sx.val.i == 0x00000002) ||
2545                                                                         (iptr->sx.val.i == 0x00000004) ||
2546                                                                         (iptr->sx.val.i == 0x00000008) ||
2547                                                                         (iptr->sx.val.i == 0x00000010) ||
2548                                                                         (iptr->sx.val.i == 0x00000020) ||
2549                                                                         (iptr->sx.val.i == 0x00000040) ||
2550                                                                         (iptr->sx.val.i == 0x00000080) ||
2551                                                                         (iptr->sx.val.i == 0x00000100) ||
2552                                                                         (iptr->sx.val.i == 0x00000200) ||
2553                                                                         (iptr->sx.val.i == 0x00000400) ||
2554                                                                         (iptr->sx.val.i == 0x00000800) ||
2555                                                                         (iptr->sx.val.i == 0x00001000) ||
2556                                                                         (iptr->sx.val.i == 0x00002000) ||
2557                                                                         (iptr->sx.val.i == 0x00004000) ||
2558                                                                         (iptr->sx.val.i == 0x00008000) ||
2559                                                                         (iptr->sx.val.i == 0x00010000) ||
2560                                                                         (iptr->sx.val.i == 0x00020000) ||
2561                                                                         (iptr->sx.val.i == 0x00040000) ||
2562                                                                         (iptr->sx.val.i == 0x00080000) ||
2563                                                                         (iptr->sx.val.i == 0x00100000) ||
2564                                                                         (iptr->sx.val.i == 0x00200000) ||
2565                                                                         (iptr->sx.val.i == 0x00400000) ||
2566                                                                         (iptr->sx.val.i == 0x00800000) ||
2567                                                                         (iptr->sx.val.i == 0x01000000) ||
2568                                                                         (iptr->sx.val.i == 0x02000000) ||
2569                                                                         (iptr->sx.val.i == 0x04000000) ||
2570                                                                         (iptr->sx.val.i == 0x08000000) ||
2571                                                                         (iptr->sx.val.i == 0x10000000) ||
2572                                                                         (iptr->sx.val.i == 0x20000000) ||
2573                                                                         (iptr->sx.val.i == 0x40000000) ||
2574                                                                         (iptr->sx.val.i == 0x80000000))
2575                                                                 {
2576                                                                         iptr->opc = ICMD_IREMPOW2;
2577                                                                         iptr->sx.val.i -= 1;
2578                                                                         goto icmd_iconst_tail;
2579                                                                 }
2580                                                                 goto normal_ICONST;
2581 #if SUPPORT_CONST_LOGICAL
2582                                                         case ICMD_IAND:
2583                                                                 iptr->opc = ICMD_IANDCONST;
2584                                                                 goto icmd_iconst_tail;
2585
2586                                                         case ICMD_IOR:
2587                                                                 iptr->opc = ICMD_IORCONST;
2588                                                                 goto icmd_iconst_tail;
2589
2590                                                         case ICMD_IXOR:
2591                                                                 iptr->opc = ICMD_IXORCONST;
2592                                                                 goto icmd_iconst_tail;
2593
2594 #endif /* SUPPORT_CONST_LOGICAL */
2595                                                         case ICMD_ISHL:
2596                                                                 iptr->opc = ICMD_ISHLCONST;
2597                                                                 goto icmd_iconst_tail;
2598
2599                                                         case ICMD_ISHR:
2600                                                                 iptr->opc = ICMD_ISHRCONST;
2601                                                                 goto icmd_iconst_tail;
2602
2603                                                         case ICMD_IUSHR:
2604                                                                 iptr->opc = ICMD_IUSHRCONST;
2605                                                                 goto icmd_iconst_tail;
2606 #if SUPPORT_LONG_SHIFT
2607                                                         case ICMD_LSHL:
2608                                                                 iptr->opc = ICMD_LSHLCONST;
2609                                                                 goto icmd_lconst_tail;
2610
2611                                                         case ICMD_LSHR:
2612                                                                 iptr->opc = ICMD_LSHRCONST;
2613                                                                 goto icmd_lconst_tail;
2614
2615                                                         case ICMD_LUSHR:
2616                                                                 iptr->opc = ICMD_LUSHRCONST;
2617                                                                 goto icmd_lconst_tail;
2618 #endif /* SUPPORT_LONG_SHIFT */
2619                                                         case ICMD_IF_ICMPEQ:
2620                                                                 iptr[1].opc = ICMD_IFEQ;
2621                                                                 /* FALLTHROUGH */
2622
2623                                                         icmd_if_icmp_tail:
2624                                                                 /* set the constant for the following icmd */
2625                                                                 iptr[1].sx.val.i = iptr->sx.val.i;
2626
2627                                                                 /* this instruction becomes a nop */
2628                                                                 iptr->opc = ICMD_NOP;
2629                                                                 goto icmd_NOP;
2630
2631                                                         case ICMD_IF_ICMPLT:
2632                                                                 iptr[1].opc = ICMD_IFLT;
2633                                                                 goto icmd_if_icmp_tail;
2634
2635                                                         case ICMD_IF_ICMPLE:
2636                                                                 iptr[1].opc = ICMD_IFLE;
2637                                                                 goto icmd_if_icmp_tail;
2638
2639                                                         case ICMD_IF_ICMPNE:
2640                                                                 iptr[1].opc = ICMD_IFNE;
2641                                                                 goto icmd_if_icmp_tail;
2642
2643                                                         case ICMD_IF_ICMPGT:
2644                                                                 iptr[1].opc = ICMD_IFGT;
2645                                                                 goto icmd_if_icmp_tail;
2646
2647                                                         case ICMD_IF_ICMPGE:
2648                                                                 iptr[1].opc = ICMD_IFGE;
2649                                                                 goto icmd_if_icmp_tail;
2650
2651 #if SUPPORT_CONST_STORE
2652                                                         case ICMD_IASTORE:
2653                                                         case ICMD_BASTORE:
2654                                                         case ICMD_CASTORE:
2655                                                         case ICMD_SASTORE:
2656 # if SUPPORT_CONST_STORE_ZERO_ONLY
2657                                                                 if (iptr->sx.val.i != 0)
2658                                                                         goto normal_ICONST;
2659 # endif
2660                                                                 switch (iptr[1].opc) {
2661                                                                         case ICMD_IASTORE:
2662                                                                                 iptr->opc = ICMD_IASTORECONST;
2663                                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
2664                                                                                 break;
2665                                                                         case ICMD_BASTORE:
2666                                                                                 iptr->opc = ICMD_BASTORECONST;
2667                                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
2668                                                                                 break;
2669                                                                         case ICMD_CASTORE:
2670                                                                                 iptr->opc = ICMD_CASTORECONST;
2671                                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
2672                                                                                 break;
2673                                                                         case ICMD_SASTORE:
2674                                                                                 iptr->opc = ICMD_SASTORECONST;
2675                                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
2676                                                                                 break;
2677                                                                 }
2678
2679                                                                 iptr[1].opc = ICMD_NOP;
2680
2681                                                                 /* copy the constant to s3 */
2682                                                                 /* XXX constval -> astoreconstval? */
2683                                                                 iptr->sx.s23.s3.constval = iptr->sx.val.i;
2684                                                                 OP2_0(TYPE_ADR, TYPE_INT);
2685                                                                 COUNT(count_pcmd_op);
2686                                                                 break;
2687
2688                                                         case ICMD_PUTSTATIC:
2689                                                         case ICMD_PUTFIELD:
2690 # if SUPPORT_CONST_STORE_ZERO_ONLY
2691                                                                 if (iptr->sx.val.i != 0)
2692                                                                         goto normal_ICONST;
2693 # endif
2694                                                                 /* XXX check field type? */
2695
2696                                                                 /* copy the constant to s2 */
2697                                                                 /* XXX constval -> fieldconstval? */
2698                                                                 iptr->sx.s23.s2.constval = iptr->sx.val.i;
2699
2700 putconst_tail:
2701                                                                 /* set the field reference (s3) */
2702                                                                 if (iptr[1].flags.bits & INS_FLAG_UNRESOLVED) {
2703                                                                         iptr->sx.s23.s3.uf = iptr[1].sx.s23.s3.uf;
2704                                                                         iptr->flags.bits |= INS_FLAG_UNRESOLVED;
2705                                                                         fmiref = iptr->sx.s23.s3.uf->fieldref;
2706                                                                 }
2707                                                                 else {
2708                                                                         fmiref = iptr[1].sx.s23.s3.fmiref;
2709                                                                         iptr->sx.s23.s3.fmiref = fmiref;
2710                                                                 }
2711
2712 #if defined(ENABLE_VERIFIER)
2713                                                                 expectedtype = fmiref->parseddesc.fd->type;
2714                                                                 switch (iptr[0].opc) {
2715                                                                         case ICMD_ICONST:
2716                                                                                 if (expectedtype != TYPE_INT)
2717                                                                                         goto throw_stack_type_error;
2718                                                                                 break;
2719                                                                         case ICMD_LCONST:
2720                                                                                 if (expectedtype != TYPE_LNG)
2721                                                                                         goto throw_stack_type_error;
2722                                                                                 break;
2723                                                                         case ICMD_ACONST:
2724                                                                                 if (expectedtype != TYPE_ADR)
2725                                                                                         goto throw_stack_type_error;
2726                                                                                 break;
2727                                                                         default:
2728                                                                                 assert(0);
2729                                                                 }
2730 #endif /* defined(ENABLE_VERIFIER) */
2731
2732                                                                 switch (iptr[1].opc) {
2733                                                                         case ICMD_PUTSTATIC:
2734                                                                                 iptr->opc = ICMD_PUTSTATICCONST;
2735                                                                                 OP0_0;
2736                                                                                 break;
2737                                                                         case ICMD_PUTFIELD:
2738                                                                                 iptr->opc = ICMD_PUTFIELDCONST;
2739                                                                                 OP1_0(TYPE_ADR);
2740                                                                                 break;
2741                                                                 }
2742
2743                                                                 iptr[1].opc = ICMD_NOP;
2744                                                                 COUNT(count_pcmd_op);
2745                                                                 break;
2746 #endif /* SUPPORT_CONST_STORE */
2747
2748                                                         default:
2749                                                                 goto normal_ICONST;
2750                                                 }
2751
2752                                                 /* if we get here, the ICONST has been optimized */
2753                                                 break;
2754
2755 normal_ICONST:
2756                                                 /* normal case of an unoptimized ICONST */
2757                                                 OP0_1(TYPE_INT);
2758                                                 break;
2759
2760         /************************** LCONST OPTIMIZATIONS **************************/
2761
2762                                         case ICMD_LCONST:
2763                                                 COUNT(count_pcmd_load);
2764                                                 if (len == 0)
2765                                                         goto normal_LCONST;
2766
2767                                                 /* switch depending on the following instruction */
2768
2769                                                 switch (iptr[1].opc) {
2770 #if SUPPORT_LONG_ADD
2771                                                         case ICMD_LADD:
2772                                                                 iptr->opc = ICMD_LADDCONST;
2773                                                                 /* FALLTHROUGH */
2774
2775                                                         icmd_lconst_tail:
2776                                                                 /* instruction of type LONG -> LONG */
2777                                                                 iptr[1].opc = ICMD_NOP;
2778                                                                 OP1_1(TYPE_LNG, TYPE_LNG);
2779                                                                 COUNT(count_pcmd_op);
2780                                                                 break;
2781
2782                                                         case ICMD_LSUB:
2783                                                                 iptr->opc = ICMD_LSUBCONST;
2784                                                                 goto icmd_lconst_tail;
2785
2786 #endif /* SUPPORT_LONG_ADD */
2787 #if SUPPORT_LONG_MUL && SUPPORT_CONST_MUL
2788                                                         case ICMD_LMUL:
2789                                                                 iptr->opc = ICMD_LMULCONST;
2790                                                                 goto icmd_lconst_tail;
2791 #else /* SUPPORT_LONG_MUL && SUPPORT_CONST_MUL */
2792 # if SUPPORT_LONG_SHIFT
2793                                                         case ICMD_LMUL:
2794                                                                 if (iptr->sx.val.l == 0x00000002)
2795                                                                         iptr->sx.val.i = 1;
2796                                                                 else if (iptr->sx.val.l == 0x00000004)
2797                                                                         iptr->sx.val.i = 2;
2798                                                                 else if (iptr->sx.val.l == 0x00000008)
2799                                                                         iptr->sx.val.i = 3;
2800                                                                 else if (iptr->sx.val.l == 0x00000010)
2801                                                                         iptr->sx.val.i = 4;
2802                                                                 else if (iptr->sx.val.l == 0x00000020)
2803                                                                         iptr->sx.val.i = 5;
2804                                                                 else if (iptr->sx.val.l == 0x00000040)
2805                                                                         iptr->sx.val.i = 6;
2806                                                                 else if (iptr->sx.val.l == 0x00000080)
2807                                                                         iptr->sx.val.i = 7;
2808                                                                 else if (iptr->sx.val.l == 0x00000100)
2809                                                                         iptr->sx.val.i = 8;
2810                                                                 else if (iptr->sx.val.l == 0x00000200)
2811                                                                         iptr->sx.val.i = 9;
2812                                                                 else if (iptr->sx.val.l == 0x00000400)
2813                                                                         iptr->sx.val.i = 10;
2814                                                                 else if (iptr->sx.val.l == 0x00000800)
2815                                                                         iptr->sx.val.i = 11;
2816                                                                 else if (iptr->sx.val.l == 0x00001000)
2817                                                                         iptr->sx.val.i = 12;
2818                                                                 else if (iptr->sx.val.l == 0x00002000)
2819                                                                         iptr->sx.val.i = 13;
2820                                                                 else if (iptr->sx.val.l == 0x00004000)
2821                                                                         iptr->sx.val.i = 14;
2822                                                                 else if (iptr->sx.val.l == 0x00008000)
2823                                                                         iptr->sx.val.i = 15;
2824                                                                 else if (iptr->sx.val.l == 0x00010000)
2825                                                                         iptr->sx.val.i = 16;
2826                                                                 else if (iptr->sx.val.l == 0x00020000)
2827                                                                         iptr->sx.val.i = 17;
2828                                                                 else if (iptr->sx.val.l == 0x00040000)
2829                                                                         iptr->sx.val.i = 18;
2830                                                                 else if (iptr->sx.val.l == 0x00080000)
2831                                                                         iptr->sx.val.i = 19;
2832                                                                 else if (iptr->sx.val.l == 0x00100000)
2833                                                                         iptr->sx.val.i = 20;
2834                                                                 else if (iptr->sx.val.l == 0x00200000)
2835                                                                         iptr->sx.val.i = 21;
2836                                                                 else if (iptr->sx.val.l == 0x00400000)
2837                                                                         iptr->sx.val.i = 22;
2838                                                                 else if (iptr->sx.val.l == 0x00800000)
2839                                                                         iptr->sx.val.i = 23;
2840                                                                 else if (iptr->sx.val.l == 0x01000000)
2841                                                                         iptr->sx.val.i = 24;
2842                                                                 else if (iptr->sx.val.l == 0x02000000)
2843                                                                         iptr->sx.val.i = 25;
2844                                                                 else if (iptr->sx.val.l == 0x04000000)
2845                                                                         iptr->sx.val.i = 26;
2846                                                                 else if (iptr->sx.val.l == 0x08000000)
2847                                                                         iptr->sx.val.i = 27;
2848                                                                 else if (iptr->sx.val.l == 0x10000000)
2849                                                                         iptr->sx.val.i = 28;
2850                                                                 else if (iptr->sx.val.l == 0x20000000)
2851                                                                         iptr->sx.val.i = 29;
2852                                                                 else if (iptr->sx.val.l == 0x40000000)
2853                                                                         iptr->sx.val.i = 30;
2854                                                                 else if (iptr->sx.val.l == 0x80000000)
2855                                                                         iptr->sx.val.i = 31;
2856                                                                 else {
2857                                                                         goto normal_LCONST;
2858                                                                 }
2859                                                                 iptr->opc = ICMD_LMULPOW2;
2860                                                                 goto icmd_lconst_tail;
2861 # endif /* SUPPORT_LONG_SHIFT */
2862 #endif /* SUPPORT_LONG_MUL && SUPPORT_CONST_MUL */
2863 #if SUPPORT_LONG_DIV_POW2
2864                                                         case ICMD_LDIV:
2865                                                                 if (iptr->sx.val.l == 0x00000002)
2866                                                                         iptr->sx.val.i = 1;
2867                                                                 else if (iptr->sx.val.l == 0x00000004)
2868                                                                         iptr->sx.val.i = 2;
2869                                                                 else if (iptr->sx.val.l == 0x00000008)
2870                                                                         iptr->sx.val.i = 3;
2871                                                                 else if (iptr->sx.val.l == 0x00000010)
2872                                                                         iptr->sx.val.i = 4;
2873                                                                 else if (iptr->sx.val.l == 0x00000020)
2874                                                                         iptr->sx.val.i = 5;
2875                                                                 else if (iptr->sx.val.l == 0x00000040)
2876                                                                         iptr->sx.val.i = 6;
2877                                                                 else if (iptr->sx.val.l == 0x00000080)
2878                                                                         iptr->sx.val.i = 7;
2879                                                                 else if (iptr->sx.val.l == 0x00000100)
2880                                                                         iptr->sx.val.i = 8;
2881                                                                 else if (iptr->sx.val.l == 0x00000200)
2882                                                                         iptr->sx.val.i = 9;
2883                                                                 else if (iptr->sx.val.l == 0x00000400)
2884                                                                         iptr->sx.val.i = 10;
2885                                                                 else if (iptr->sx.val.l == 0x00000800)
2886                                                                         iptr->sx.val.i = 11;
2887                                                                 else if (iptr->sx.val.l == 0x00001000)
2888                                                                         iptr->sx.val.i = 12;
2889                                                                 else if (iptr->sx.val.l == 0x00002000)
2890                                                                         iptr->sx.val.i = 13;
2891                                                                 else if (iptr->sx.val.l == 0x00004000)
2892                                                                         iptr->sx.val.i = 14;
2893                                                                 else if (iptr->sx.val.l == 0x00008000)
2894                                                                         iptr->sx.val.i = 15;
2895                                                                 else if (iptr->sx.val.l == 0x00010000)
2896                                                                         iptr->sx.val.i = 16;
2897                                                                 else if (iptr->sx.val.l == 0x00020000)
2898                                                                         iptr->sx.val.i = 17;
2899                                                                 else if (iptr->sx.val.l == 0x00040000)
2900                                                                         iptr->sx.val.i = 18;
2901                                                                 else if (iptr->sx.val.l == 0x00080000)
2902                                                                         iptr->sx.val.i = 19;
2903                                                                 else if (iptr->sx.val.l == 0x00100000)
2904                                                                         iptr->sx.val.i = 20;
2905                                                                 else if (iptr->sx.val.l == 0x00200000)
2906                                                                         iptr->sx.val.i = 21;
2907                                                                 else if (iptr->sx.val.l == 0x00400000)
2908                                                                         iptr->sx.val.i = 22;
2909                                                                 else if (iptr->sx.val.l == 0x00800000)
2910                                                                         iptr->sx.val.i = 23;
2911                                                                 else if (iptr->sx.val.l == 0x01000000)
2912                                                                         iptr->sx.val.i = 24;
2913                                                                 else if (iptr->sx.val.l == 0x02000000)
2914                                                                         iptr->sx.val.i = 25;
2915                                                                 else if (iptr->sx.val.l == 0x04000000)
2916                                                                         iptr->sx.val.i = 26;
2917                                                                 else if (iptr->sx.val.l == 0x08000000)
2918                                                                         iptr->sx.val.i = 27;
2919                                                                 else if (iptr->sx.val.l == 0x10000000)
2920                                                                         iptr->sx.val.i = 28;
2921                                                                 else if (iptr->sx.val.l == 0x20000000)
2922                                                                         iptr->sx.val.i = 29;
2923                                                                 else if (iptr->sx.val.l == 0x40000000)
2924                                                                         iptr->sx.val.i = 30;
2925                                                                 else if (iptr->sx.val.l == 0x80000000)
2926                                                                         iptr->sx.val.i = 31;
2927                                                                 else {
2928                                                                         goto normal_LCONST;
2929                                                                 }
2930                                                                 iptr->opc = ICMD_LDIVPOW2;
2931                                                                 goto icmd_lconst_tail;
2932 #endif /* SUPPORT_LONG_DIV_POW2 */
2933
2934 #if SUPPORT_LONG_REM_POW2
2935                                                         case ICMD_LREM:
2936                                                                 if ((iptr->sx.val.l == 0x00000002) ||
2937                                                                         (iptr->sx.val.l == 0x00000004) ||
2938                                                                         (iptr->sx.val.l == 0x00000008) ||
2939                                                                         (iptr->sx.val.l == 0x00000010) ||
2940                                                                         (iptr->sx.val.l == 0x00000020) ||
2941                                                                         (iptr->sx.val.l == 0x00000040) ||
2942                                                                         (iptr->sx.val.l == 0x00000080) ||
2943                                                                         (iptr->sx.val.l == 0x00000100) ||
2944                                                                         (iptr->sx.val.l == 0x00000200) ||
2945                                                                         (iptr->sx.val.l == 0x00000400) ||
2946                                                                         (iptr->sx.val.l == 0x00000800) ||
2947                                                                         (iptr->sx.val.l == 0x00001000) ||
2948                                                                         (iptr->sx.val.l == 0x00002000) ||
2949                                                                         (iptr->sx.val.l == 0x00004000) ||
2950                                                                         (iptr->sx.val.l == 0x00008000) ||
2951                                                                         (iptr->sx.val.l == 0x00010000) ||
2952                                                                         (iptr->sx.val.l == 0x00020000) ||
2953                                                                         (iptr->sx.val.l == 0x00040000) ||
2954                                                                         (iptr->sx.val.l == 0x00080000) ||
2955                                                                         (iptr->sx.val.l == 0x00100000) ||
2956                                                                         (iptr->sx.val.l == 0x00200000) ||
2957                                                                         (iptr->sx.val.l == 0x00400000) ||
2958                                                                         (iptr->sx.val.l == 0x00800000) ||
2959                                                                         (iptr->sx.val.l == 0x01000000) ||
2960                                                                         (iptr->sx.val.l == 0x02000000) ||
2961                                                                         (iptr->sx.val.l == 0x04000000) ||
2962                                                                         (iptr->sx.val.l == 0x08000000) ||
2963                                                                         (iptr->sx.val.l == 0x10000000) ||
2964                                                                         (iptr->sx.val.l == 0x20000000) ||
2965                                                                         (iptr->sx.val.l == 0x40000000) ||
2966                                                                         (iptr->sx.val.l == 0x80000000))
2967                                                                 {
2968                                                                         iptr->opc = ICMD_LREMPOW2;
2969                                                                         iptr->sx.val.l -= 1;
2970                                                                         goto icmd_lconst_tail;
2971                                                                 }
2972                                                                 goto normal_LCONST;
2973 #endif /* SUPPORT_LONG_REM_POW2 */
2974
2975 #if SUPPORT_LONG_LOGICAL && SUPPORT_CONST_LOGICAL
2976
2977                                                         case ICMD_LAND:
2978                                                                 iptr->opc = ICMD_LANDCONST;
2979                                                                 goto icmd_lconst_tail;
2980
2981                                                         case ICMD_LOR:
2982                                                                 iptr->opc = ICMD_LORCONST;
2983                                                                 goto icmd_lconst_tail;
2984
2985                                                         case ICMD_LXOR:
2986                                                                 iptr->opc = ICMD_LXORCONST;
2987                                                                 goto icmd_lconst_tail;
2988 #endif /* SUPPORT_LONG_LOGICAL && SUPPORT_CONST_LOGICAL */
2989
2990 #if SUPPORT_LONG_CMP_CONST
2991                                                         case ICMD_LCMP:
2992                                                                 if ((len <= 1) || (iptr[2].sx.val.i != 0))
2993                                                                         goto normal_LCONST;
2994
2995                                                                 /* switch on the instruction after LCONST - LCMP */
2996
2997                                                                 switch (iptr[2].opc) {
2998                                                                         case ICMD_IFEQ:
2999                                                                                 iptr->opc = ICMD_IF_LEQ;
3000                                                                                 /* FALLTHROUGH */
3001
3002                                                                         icmd_lconst_lcmp_tail:
3003                                                                                 /* convert LCONST, LCMP, IFXX to IF_LXX */
3004                                                                                 iptr->dst.block = iptr[2].dst.block;
3005                                                                                 iptr[1].opc = ICMD_NOP;
3006                                                                                 iptr[2].opc = ICMD_NOP;
3007
3008                                                                                 OP1_BRANCH(TYPE_LNG);
3009                                                                                 BRANCH(tbptr);
3010                                                                                 COUNT(count_pcmd_bra);
3011                                                                                 COUNT(count_pcmd_op);
3012                                                                                 break;
3013
3014                                                                         case ICMD_IFNE:
3015                                                                                 iptr->opc = ICMD_IF_LNE;
3016                                                                                 goto icmd_lconst_lcmp_tail;
3017
3018                                                                         case ICMD_IFLT:
3019                                                                                 iptr->opc = ICMD_IF_LLT;
3020                                                                                 goto icmd_lconst_lcmp_tail;
3021
3022                                                                         case ICMD_IFGT:
3023                                                                                 iptr->opc = ICMD_IF_LGT;
3024                                                                                 goto icmd_lconst_lcmp_tail;
3025
3026                                                                         case ICMD_IFLE:
3027                                                                                 iptr->opc = ICMD_IF_LLE;
3028                                                                                 goto icmd_lconst_lcmp_tail;
3029
3030                                                                         case ICMD_IFGE:
3031                                                                                 iptr->opc = ICMD_IF_LGE;
3032                                                                                 goto icmd_lconst_lcmp_tail;
3033
3034                                                                         default:
3035                                                                                 goto normal_LCONST;
3036                                                                 } /* end switch on opcode after LCONST - LCMP */
3037                                                                 break;
3038 #endif /* SUPPORT_LONG_CMP_CONST */
3039
3040 #if SUPPORT_CONST_STORE
3041                                                         case ICMD_LASTORE:
3042 # if SUPPORT_CONST_STORE_ZERO_ONLY
3043                                                                 if (iptr->sx.val.l != 0)
3044                                                                         goto normal_LCONST;
3045 # endif
3046 #if SIZEOF_VOID_P == 4
3047                                                                 /* the constant must fit into a ptrint */
3048                                                                 if (iptr->sx.val.l < -0x80000000L || iptr->sx.val.l >= 0x80000000L)
3049                                                                         goto normal_LCONST;
3050 #endif
3051                                                                 /* move the constant to s3 */
3052                                                                 iptr->sx.s23.s3.constval = iptr->sx.val.l;
3053
3054                                                                 iptr->opc = ICMD_LASTORECONST;
3055                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3056                                                                 OP2_0(TYPE_ADR, TYPE_INT);
3057
3058                                                                 iptr[1].opc = ICMD_NOP;
3059                                                                 COUNT(count_pcmd_op);
3060                                                                 break;
3061
3062                                                         case ICMD_PUTSTATIC:
3063                                                         case ICMD_PUTFIELD:
3064 # if SUPPORT_CONST_STORE_ZERO_ONLY
3065                                                                 if (iptr->sx.val.l != 0)
3066                                                                         goto normal_LCONST;
3067 # endif
3068 #if SIZEOF_VOID_P == 4
3069                                                                 /* the constant must fit into a ptrint */
3070                                                                 if (iptr->sx.val.l < -0x80000000L || iptr->sx.val.l >= 0x80000000L)
3071                                                                         goto normal_LCONST;
3072 #endif
3073                                                                 /* XXX check field type? */
3074
3075                                                                 /* copy the constant to s2 */
3076                                                                 /* XXX constval -> fieldconstval? */
3077                                                                 iptr->sx.s23.s2.constval = iptr->sx.val.l;
3078
3079                                                                 goto putconst_tail;
3080
3081 #endif /* SUPPORT_CONST_STORE */
3082
3083                                                         default:
3084                                                                 goto normal_LCONST;
3085                                                 } /* end switch opcode after LCONST */
3086
3087                                                 /* if we get here, the LCONST has been optimized */
3088                                                 break;
3089
3090 normal_LCONST:
3091                                                 /* the normal case of an unoptimized LCONST */
3092                                                 OP0_1(TYPE_LNG);
3093                                                 break;
3094
3095         /************************ END OF LCONST OPTIMIZATIONS *********************/
3096
3097                                         case ICMD_FCONST:
3098                                                 COUNT(count_pcmd_load);
3099                                                 OP0_1(TYPE_FLT);
3100                                                 break;
3101
3102                                         case ICMD_DCONST:
3103                                                 COUNT(count_pcmd_load);
3104                                                 OP0_1(TYPE_DBL);
3105                                                 break;
3106
3107         /************************** ACONST OPTIMIZATIONS **************************/
3108
3109                                         case ICMD_ACONST:
3110                                                 coalescing_boundary = sd.new;
3111                                                 COUNT(count_pcmd_load);
3112 #if SUPPORT_CONST_STORE
3113                                                 /* We can only optimize if the ACONST is resolved
3114                                                  * and there is an instruction after it. */
3115
3116                                                 if ((len == 0) || (iptr->flags.bits & INS_FLAG_UNRESOLVED))
3117                                                         goto normal_ACONST;
3118
3119                                                 switch (iptr[1].opc) {
3120                                                         case ICMD_AASTORE:
3121                                                                 /* We can only optimize for NULL values
3122                                                                  * here because otherwise a checkcast is
3123                                                                  * required. */
3124                                                                 if (iptr->sx.val.anyptr != NULL)
3125                                                                         goto normal_ACONST;
3126
3127                                                                 /* copy the constant (NULL) to s3 */
3128                                                                 iptr->sx.s23.s3.constval = 0;
3129                                                                 iptr->opc = ICMD_AASTORECONST;
3130                                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3131                                                                 OP2_0(TYPE_ADR, TYPE_INT);
3132
3133                                                                 iptr[1].opc = ICMD_NOP;
3134                                                                 COUNT(count_pcmd_op);
3135                                                                 break;
3136
3137                                                         case ICMD_PUTSTATIC:
3138                                                         case ICMD_PUTFIELD:
3139 # if SUPPORT_CONST_STORE_ZERO_ONLY
3140                                                                 if (iptr->sx.val.anyptr != NULL)
3141                                                                         goto normal_ACONST;
3142 # endif
3143                                                                 /* XXX check field type? */
3144                                                                 /* copy the constant to s2 */
3145                                                                 /* XXX constval -> fieldconstval? */
3146                                                                 iptr->sx.s23.s2.constval = (ptrint) iptr->sx.val.anyptr;
3147
3148                                                                 goto putconst_tail;
3149
3150                                                         default:
3151                                                                 goto normal_ACONST;
3152                                                 }
3153
3154                                                 /* if we get here the ACONST has been optimized */
3155                                                 break;
3156
3157 normal_ACONST:
3158 #endif /* SUPPORT_CONST_STORE */
3159                                                 OP0_1(TYPE_ADR);
3160                                                 break;
3161
3162
3163                                                 /* pop 0 push 1 load */
3164
3165                                         case ICMD_ILOAD:
3166                                         case ICMD_LLOAD:
3167                                         case ICMD_FLOAD:
3168                                         case ICMD_DLOAD:
3169                                         case ICMD_ALOAD:
3170                                                 COUNT(count_load_instruction);
3171                                                 i = opcode - ICMD_ILOAD; /* type */
3172
3173                                                 j = iptr->s1.varindex =
3174                                                         jd->local_map[iptr->s1.varindex * 5 + i];
3175
3176 #if defined(ENABLE_VERIFIER)
3177                                                 if (sd.var[j].type == TYPE_RET) {
3178                                                         exceptions_throw_verifyerror(m, "forbidden load of returnAddress");
3179                                                         return false;
3180                                                 }
3181 #endif
3182
3183 #if defined(ENABLE_SSA)
3184                                                 if (ls != NULL) {
3185                                                         GET_NEW_VAR(sd, new_index, i);
3186                                                         DST(i, new_index);
3187                                                         stackdepth++;
3188                                                 }
3189                                                 else
3190
3191 #else
3192                                                 LOAD(i, j);
3193 #endif
3194                                                 break;
3195
3196                                                 /* pop 2 push 1 */
3197
3198                                         case ICMD_LALOAD:
3199                                         case ICMD_FALOAD:
3200                                         case ICMD_DALOAD:
3201                                         case ICMD_AALOAD:
3202                                                 coalescing_boundary = sd.new;
3203                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3204                                                 COUNT(count_check_null);
3205                                                 COUNT(count_check_bound);
3206                                                 COUNT(count_pcmd_mem);
3207                                                 OP2_1(TYPE_ADR, TYPE_INT, opcode - ICMD_IALOAD);
3208                                                 break;
3209
3210                                         case ICMD_IALOAD:
3211                                         case ICMD_BALOAD:
3212                                         case ICMD_CALOAD:
3213                                         case ICMD_SALOAD:
3214                                                 coalescing_boundary = sd.new;
3215                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3216                                                 COUNT(count_check_null);
3217                                                 COUNT(count_check_bound);
3218                                                 COUNT(count_pcmd_mem);
3219                                                 OP2_1(TYPE_ADR, TYPE_INT, TYPE_INT);
3220                                                 break;
3221
3222                                                 /* pop 0 push 0 iinc */
3223
3224                                         case ICMD_IINC:
3225                                                 STATISTICS_STACKDEPTH_DISTRIBUTION(count_store_depth);
3226 #if defined(ENABLE_SSA)
3227                                                 if (ls != NULL) {
3228                                                         iptr->s1.varindex =
3229                                                                 jd->local_map[iptr->s1.varindex * 5 +TYPE_INT];
3230                                                 }
3231                                                 else {
3232 #endif
3233                                                 last_store_boundary[iptr->s1.varindex] = sd.new;
3234
3235                                                 iptr->s1.varindex =
3236                                                         jd->local_map[iptr->s1.varindex * 5 + TYPE_INT];
3237
3238                                                 copy = curstack;
3239                                                 i = stackdepth - 1;
3240                                                 while (copy) {
3241                                                         if ((copy->varkind == LOCALVAR) &&
3242                                                                 (copy->varnum == iptr->s1.varindex))
3243                                                         {
3244                                                                 assert(IS_LOCALVAR(copy));
3245                                                                 SET_TEMPVAR(copy);
3246                                                         }
3247                                                         i--;
3248                                                         copy = copy->prev;
3249                                                 }
3250 #if defined(ENABLE_SSA)
3251                                                 }
3252 #endif
3253
3254                                                 iptr->dst.varindex = iptr->s1.varindex;
3255                                                 break;
3256
3257                                                 /* pop 1 push 0 store */
3258
3259                                         case ICMD_ISTORE:
3260                                         case ICMD_LSTORE:
3261                                         case ICMD_FSTORE:
3262                                         case ICMD_DSTORE:
3263                                         case ICMD_ASTORE:
3264                                                 REQUIRE(1);
3265
3266                                                 i = opcode - ICMD_ISTORE; /* type */
3267                                                 javaindex = iptr->dst.varindex;
3268                                                 j = iptr->dst.varindex =
3269                                                         jd->local_map[javaindex * 5 + i];
3270
3271                                                 COPY_VAL_AND_TYPE(sd, curstack->varnum, j);
3272
3273                                                 iptr->sx.s23.s3.javaindex = javaindex;
3274
3275                                                 if (curstack->type == TYPE_RET) {
3276                                                         iptr->flags.bits |= INS_FLAG_RETADDR;
3277                                                         iptr->sx.s23.s2.retaddrnr =
3278                                                                 UNUSED - (1 + sd.var[j].vv.retaddr->nr);
3279                                                         sd.javalocals[javaindex] = iptr->sx.s23.s2.retaddrnr;
3280                                                 }
3281                                                 else
3282                                                         sd.javalocals[javaindex] = j;
3283
3284                                                 /* invalidate the following javalocal for 2-word types */
3285
3286                                                 if (IS_2_WORD_TYPE(i)) {
3287                                                         sd.javalocals[javaindex+1] = UNUSED;
3288                                                         iptr->flags.bits |= INS_FLAG_KILL_NEXT;
3289                                                 }
3290
3291                                                 /* invalidate 2-word types if second half was overwritten */
3292
3293                                                 if (javaindex > 0 && (i = sd.javalocals[javaindex-1]) >= 0) {
3294                                                         if (IS_2_WORD_TYPE(sd.var[i].type)) {
3295                                                                 sd.javalocals[javaindex-1] = UNUSED;
3296                                                                 iptr->flags.bits |= INS_FLAG_KILL_PREV;
3297                                                         }
3298                                                 }
3299
3300 #if defined(ENABLE_STATISTICS)
3301                                                 if (opt_stat) {
3302                                                         count_pcmd_store++;
3303                                                         i = sd.new - curstack;
3304                                                         if (i >= 20)
3305                                                                 count_store_length[20]++;
3306                                                         else
3307                                                                 count_store_length[i]++;
3308                                                         i = stackdepth - 1;
3309                                                         if (i >= 10)
3310                                                                 count_store_depth[10]++;
3311                                                         else
3312                                                                 count_store_depth[i]++;
3313                                                 }
3314 #endif
3315
3316 #if defined(ENABLE_SSA)
3317                                                 if (ls != NULL) {
3318 #endif
3319                                                 /* check for conflicts as described in Figure 5.2 */
3320
3321                                                 copy = curstack->prev;
3322                                                 i = stackdepth - 2;
3323                                                 while (copy) {
3324                                                         if ((copy->varkind == LOCALVAR) &&
3325                                                                 (copy->varnum == j))
3326                                                         {
3327                                                                 copy->varkind = TEMPVAR;
3328                                                                 assert(IS_LOCALVAR(copy));
3329                                                                 SET_TEMPVAR(copy);
3330                                                         }
3331                                                         i--;
3332                                                         copy = copy->prev;
3333                                                 }
3334
3335                                                 /* if the variable is already coalesced, don't bother */
3336
3337                                                 /* We do not need to check against INOUT, as invars */
3338                                                 /* are always before the coalescing boundary.        */
3339
3340                                                 if (curstack->varkind == LOCALVAR)
3341                                                         goto store_tail;
3342
3343                                                 /* there is no STORE Lj while curstack is live */
3344
3345                                                 if (curstack < last_store_boundary[javaindex])
3346                                                         goto assume_conflict;
3347
3348                                                 /* curstack must be after the coalescing boundary */
3349
3350                                                 if (curstack < coalescing_boundary)
3351                                                         goto assume_conflict;
3352
3353                                                 /* there is no DEF LOCALVAR(j) while curstack is live */
3354
3355                                                 copy = sd.new; /* most recent stackslot created + 1 */
3356                                                 while (--copy > curstack) {
3357                                                         if (copy->varkind == LOCALVAR && copy->varnum == j)
3358                                                                 goto assume_conflict;
3359                                                 }
3360
3361                                                 /* coalesce the temporary variable with Lj */
3362                                                 assert((curstack->varkind == TEMPVAR)
3363                                                                         || (curstack->varkind == UNDEFVAR));
3364                                                 assert(!IS_LOCALVAR(curstack)); /* XXX correct? */
3365                                                 assert(!IS_INOUT(curstack));
3366                                                 assert(!IS_PREALLOC(curstack));
3367
3368                                                 assert(curstack->creator);
3369                                                 assert(curstack->creator->dst.varindex == curstack->varnum);
3370                                                 assert(!(curstack->flags & PASSTHROUGH));
3371                                                 RELEASE_INDEX(sd, curstack);
3372                                                 curstack->varkind = LOCALVAR;
3373                                                 curstack->varnum = j;
3374                                                 curstack->creator->dst.varindex = j;
3375                                                 goto store_tail;
3376
3377                                                 /* revert the coalescing, if it has been done earlier */
3378 assume_conflict:
3379                                                 if ((curstack->varkind == LOCALVAR)
3380                                                         && (curstack->varnum == j))
3381                                                 {
3382                                                         assert(IS_LOCALVAR(curstack));
3383                                                         SET_TEMPVAR(curstack);
3384                                                 }
3385
3386                                                 /* remember the stack boundary at this store */
3387 store_tail:
3388                                                 last_store_boundary[javaindex] = sd.new;
3389 #if defined(ENABLE_SSA)
3390                                                 } /* if (ls != NULL) */
3391 #endif
3392
3393                                                 if (opcode == ICMD_ASTORE && curstack->type == TYPE_RET)
3394                                                         STORE(TYPE_RET, j);
3395                                                 else
3396                                                         STORE(opcode - ICMD_ISTORE, j);
3397                                                 break;
3398
3399                                         /* pop 3 push 0 */
3400
3401                                         case ICMD_AASTORE:
3402                                                 coalescing_boundary = sd.new;
3403                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3404                                                 COUNT(count_check_null);
3405                                                 COUNT(count_check_bound);
3406                                                 COUNT(count_pcmd_mem);
3407
3408                                                 bte = builtintable_get_internal(BUILTIN_canstore);
3409                                                 md = bte->md;
3410
3411                                                 if (md->memuse > rd->memuse)
3412                                                         rd->memuse = md->memuse;
3413                                                 if (md->argintreguse > rd->argintreguse)
3414                                                         rd->argintreguse = md->argintreguse;
3415                                                 /* XXX non-leaf method? */
3416
3417                                                 /* make all stack variables saved */
3418
3419                                                 copy = curstack;
3420                                                 while (copy) {
3421                                                         sd.var[copy->varnum].flags |= SAVEDVAR;
3422                                                         /* in case copy->varnum is/will be a LOCALVAR */
3423                                                         /* once and set back to a non LOCALVAR        */
3424                                                         /* the correct SAVEDVAR flag has to be        */
3425                                                         /* remembered in copy->flags, too             */
3426                                                         copy->flags |= SAVEDVAR;
3427                                                         copy = copy->prev;
3428                                                 }
3429
3430                                                 OP3_0(TYPE_ADR, TYPE_INT, TYPE_ADR);
3431                                                 break;
3432
3433
3434                                         case ICMD_LASTORE:
3435                                         case ICMD_FASTORE:
3436                                         case ICMD_DASTORE:
3437                                                 coalescing_boundary = sd.new;
3438                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3439                                                 COUNT(count_check_null);
3440                                                 COUNT(count_check_bound);
3441                                                 COUNT(count_pcmd_mem);
3442                                                 OP3_0(TYPE_ADR, TYPE_INT, opcode - ICMD_IASTORE);
3443                                                 break;
3444
3445                                         case ICMD_IASTORE:
3446                                         case ICMD_BASTORE:
3447                                         case ICMD_CASTORE:
3448                                         case ICMD_SASTORE:
3449                                                 coalescing_boundary = sd.new;
3450                                                 iptr->flags.bits |= INS_FLAG_CHECK;
3451                                                 COUNT(count_check_null);
3452                                                 COUNT(count_check_bound);
3453                                                 COUNT(count_pcmd_mem);
3454                                                 OP3_0(TYPE_ADR, TYPE_INT, TYPE_INT);
3455                                                 break;
3456
3457                                                 /* pop 1 push 0 */
3458
3459                                         case ICMD_POP:
3460 #ifdef ENABLE_VERIFIER
3461                                                 if (opt_verify) {
3462                                                         REQUIRE(1);
3463                                                         if (IS_2_WORD_TYPE(curstack->type))
3464                                                                 goto throw_stack_category_error;
3465                                                 }
3466 #endif
3467                                                 OP1_0_ANY;
3468                                                 break;
3469
3470                                         case ICMD_IRETURN:
3471                                         case ICMD_LRETURN:
3472                                         case ICMD_FRETURN:
3473                                         case ICMD_DRETURN:
3474                                         case ICMD_ARETURN:
3475                                                 coalescing_boundary = sd.new;
3476                                                 /* Assert here that no LOCAL or INOUTS get */
3477                                                 /* preallocated, since tha macros are not   */
3478                                                 /* available in md-abi.c! */
3479                                                 if (IS_TEMPVAR(curstack))
3480                                                         md_return_alloc(jd, curstack);
3481                                                 COUNT(count_pcmd_return);
3482                                                 OP1_0(opcode - ICMD_IRETURN);
3483                                                 superblockend = true;
3484                                                 sd.jd->returncount++;
3485                                                 sd.jd->returnblock = sd.bptr;
3486                                                 break;
3487
3488                                         case ICMD_ATHROW:
3489                                                 coalescing_boundary = sd.new;
3490                                                 COUNT(count_check_null);
3491                                                 OP1_0(TYPE_ADR);
3492                                                 curstack = NULL; stackdepth = 0;
3493                                                 superblockend = true;
3494                                                 break;
3495
3496                                         case ICMD_PUTSTATIC:
3497                                                 coalescing_boundary = sd.new;
3498                                                 COUNT(count_pcmd_mem);
3499                                                 INSTRUCTION_GET_FIELDREF(iptr, fmiref);
3500                                                 OP1_0(fmiref->parseddesc.fd->type);
3501                                                 break;
3502
3503                                                 /* pop 1 push 0 branch */
3504
3505                                         case ICMD_IFNULL:
3506                                         case ICMD_IFNONNULL:
3507                                                 COUNT(count_pcmd_bra);
3508                                                 OP1_BRANCH(TYPE_ADR);
3509                                                 BRANCH(tbptr);
3510                                                 break;
3511
3512                                         case ICMD_IFEQ:
3513                                         case ICMD_IFNE:
3514                                         case ICMD_IFLT:
3515                                         case ICMD_IFGE:
3516                                         case ICMD_IFGT:
3517                                         case ICMD_IFLE:
3518                                                 COUNT(count_pcmd_bra);
3519                                                 /* iptr->sx.val.i is set implicitly in parse by
3520                                                    clearing the memory or from IF_ICMPxx
3521                                                    optimization. */
3522
3523                                                 OP1_BRANCH(TYPE_INT);
3524 /*                                              iptr->sx.val.i = 0; */
3525                                                 BRANCH(tbptr);
3526                                                 break;
3527
3528                                                 /* pop 0 push 0 branch */
3529
3530                                         case ICMD_GOTO:
3531                                                 COUNT(count_pcmd_bra);
3532                                                 OP0_BRANCH;
3533                                                 BRANCH(tbptr);
3534                                                 superblockend = true;
3535                                                 break;
3536
3537                                                 /* pop 1 push 0 table branch */
3538
3539                                         case ICMD_TABLESWITCH:
3540                                                 COUNT(count_pcmd_table);
3541                                                 OP1_BRANCH(TYPE_INT);
3542
3543                                                 table = iptr->dst.table;
3544                                                 BRANCH_TARGET(*table, tbptr);
3545                                                 table++;
3546
3547                                                 i = iptr->sx.s23.s3.tablehigh
3548                                                   - iptr->sx.s23.s2.tablelow + 1;
3549
3550                                                 while (--i >= 0) {
3551                                                         BRANCH_TARGET(*table, tbptr);
3552                                                         table++;
3553                                                 }
3554                                                 superblockend = true;
3555                                                 break;
3556
3557                                                 /* pop 1 push 0 table branch */
3558
3559                                         case ICMD_LOOKUPSWITCH:
3560                                                 COUNT(count_pcmd_table);
3561                                                 OP1_BRANCH(TYPE_INT);
3562
3563                                                 BRANCH_TARGET(iptr->sx.s23.s3.lookupdefault, tbptr);
3564
3565                                                 lookup = iptr->dst.lookup;
3566
3567                                                 i = iptr->sx.s23.s2.lookupcount;
3568
3569                                                 while (--i >= 0) {
3570                                                         BRANCH_TARGET(lookup->target, tbptr);
3571                                                         lookup++;
3572                                                 }
3573                                                 superblockend = true;
3574                                                 break;
3575
3576                                         case ICMD_MONITORENTER:
3577                                         case ICMD_MONITOREXIT:
3578                                                 coalescing_boundary = sd.new;
3579                                                 COUNT(count_check_null);
3580                                                 OP1_0(TYPE_ADR);
3581                                                 break;
3582
3583                                                 /* pop 2 push 0 branch */
3584
3585                                         case ICMD_IF_ICMPEQ:
3586                                         case ICMD_IF_ICMPNE:
3587                                         case ICMD_IF_ICMPLT:
3588                                         case ICMD_IF_ICMPGE:
3589                                         case ICMD_IF_ICMPGT:
3590                                         case ICMD_IF_ICMPLE:
3591                                                 COUNT(count_pcmd_bra);
3592                                                 OP2_BRANCH(TYPE_INT, TYPE_INT);
3593                                                 BRANCH(tbptr);
3594                                                 break;
3595
3596                                         case ICMD_IF_ACMPEQ:
3597                                         case ICMD_IF_ACMPNE:
3598                                                 COUNT(count_pcmd_bra);
3599                                                 OP2_BRANCH(TYPE_ADR, TYPE_ADR);
3600                                                 BRANCH(tbptr);
3601                                                 break;
3602
3603                                                 /* pop 2 push 0 */
3604
3605                                         case ICMD_PUTFIELD:
3606                                                 coalescing_boundary = sd.new;
3607                                                 COUNT(count_check_null);
3608                                                 COUNT(count_pcmd_mem);
3609                                                 INSTRUCTION_GET_FIELDREF(iptr, fmiref);
3610                                                 OP2_0(TYPE_ADR, fmiref->parseddesc.fd->type);
3611                                                 break;
3612
3613                                         case ICMD_POP2:
3614                                                 REQUIRE(1);
3615                                                 if (!IS_2_WORD_TYPE(curstack->type)) {
3616                                                         /* ..., cat1 */
3617 #ifdef ENABLE_VERIFIER
3618                                                         if (opt_verify) {
3619                                                                 REQUIRE(2);
3620                                                                 if (IS_2_WORD_TYPE(curstack->prev->type))
3621                                                                         goto throw_stack_category_error;
3622                                                         }
3623 #endif
3624                                                         OP2_0_ANY_ANY; /* pop two slots */
3625                                                 }
3626                                                 else {
3627                                                         iptr->opc = ICMD_POP;
3628                                                         OP1_0_ANY; /* pop one (two-word) slot */
3629                                                 }
3630                                                 break;
3631
3632                                                 /* pop 0 push 1 dup */
3633
3634                                         case ICMD_DUP:
3635 #ifdef ENABLE_VERIFIER
3636                                                 if (opt_verify) {
3637                                                         REQUIRE(1);
3638                                                         if (IS_2_WORD_TYPE(curstack->type))
3639                                                                 goto throw_stack_category_error;
3640                                                 }
3641 #endif
3642                                                 COUNT(count_dup_instruction);
3643
3644 icmd_DUP:
3645                                                 src1 = curstack;
3646
3647                                                 COPY_UP(src1);
3648                                                 coalescing_boundary = sd.new - 1;
3649                                                 break;
3650
3651                                         case ICMD_DUP2:
3652                                                 REQUIRE(1);
3653                                                 if (IS_2_WORD_TYPE(curstack->type)) {
3654                                                         /* ..., cat2 */
3655                                                         iptr->opc = ICMD_DUP;
3656                                                         goto icmd_DUP;
3657                                                 }
3658                                                 else {
3659                                                         REQUIRE(2);
3660                                                         /* ..., ????, cat1 */
3661 #ifdef ENABLE_VERIFIER
3662                                                         if (opt_verify) {
3663                                                                 if (IS_2_WORD_TYPE(curstack->prev->type))
3664                                                                         goto throw_stack_category_error;
3665                                                         }
3666 #endif
3667                                                         src1 = curstack->prev;
3668                                                         src2 = curstack;
3669
3670                                                         COPY_UP(src1); iptr++; len--;
3671                                                         COPY_UP(src2);
3672
3673                                                         coalescing_boundary = sd.new;
3674                                                 }
3675                                                 break;
3676
3677                                                 /* pop 2 push 3 dup */
3678
3679                                         case ICMD_DUP_X1:
3680 #ifdef ENABLE_VERIFIER
3681                                                 if (opt_verify) {
3682                                                         REQUIRE(2);
3683                                                         if (IS_2_WORD_TYPE(curstack->type) ||
3684                                                                 IS_2_WORD_TYPE(curstack->prev->type))
3685                                                                         goto throw_stack_category_error;
3686                                                 }
3687 #endif
3688
3689 icmd_DUP_X1:
3690                                                 src1 = curstack->prev;
3691                                                 src2 = curstack;
3692                                                 POPANY; POPANY;
3693                                                 stackdepth -= 2;
3694
3695                                                 /* move non-temporary sources out of the way */
3696                                                 if (!IS_TEMPVAR(src2)) {
3697                                                         MOVE_TO_TEMP(src2); iptr++; len--;
3698                                                 }
3699
3700                                                 DUP_SLOT(src2); dst1 = curstack; stackdepth++;
3701
3702                                                 MOVE_UP(src1); iptr++; len--;
3703                                                 MOVE_UP(src2); iptr++; len--;
3704
3705                                                 COPY_DOWN(curstack, dst1);
3706
3707                                                 coalescing_boundary = sd.new;
3708                                                 break;
3709
3710                                         case ICMD_DUP2_X1:
3711                                                 REQUIRE(2);
3712                                                 if (IS_2_WORD_TYPE(curstack->type)) {
3713                                                         /* ..., ????, cat2 */
3714 #ifdef ENABLE_VERIFIER
3715                                                         if (opt_verify) {
3716                                                                 if (IS_2_WORD_TYPE(curstack->prev->type))
3717                                                                         goto throw_stack_category_error;
3718                                                         }
3719 #endif
3720                                                         iptr->opc = ICMD_DUP_X1;
3721                                                         goto icmd_DUP_X1;
3722                                                 }
3723                                                 else {
3724                                                         /* ..., ????, cat1 */
3725 #ifdef ENABLE_VERIFIER
3726                                                         if (opt_verify) {
3727                                                                 REQUIRE(3);
3728                                                                 if (IS_2_WORD_TYPE(curstack->prev->type)
3729                                                                         || IS_2_WORD_TYPE(curstack->prev->prev->type))
3730                                                                                 goto throw_stack_category_error;
3731                                                         }
3732 #endif
3733
3734 icmd_DUP2_X1:
3735                                                         src1 = curstack->prev->prev;
3736                                                         src2 = curstack->prev;
3737                                                         src3 = curstack;
3738                                                         POPANY; POPANY; POPANY;
3739                                                         stackdepth -= 3;
3740
3741                                                         /* move non-temporary sources out of the way */
3742                                                         if (!IS_TEMPVAR(src2)) {
3743                                                                 MOVE_TO_TEMP(src2); iptr++; len--;
3744                                                         }
3745                                                         if (!IS_TEMPVAR(src3)) {
3746                                                                 MOVE_TO_TEMP(src3); iptr++; len--;
3747                                                         }
3748
3749                                                         DUP_SLOT(src2); dst1 = curstack; stackdepth++;
3750                                                         DUP_SLOT(src3); dst2 = curstack; stackdepth++;
3751
3752                                                         MOVE_UP(src1); iptr++; len--;
3753                                                         MOVE_UP(src2); iptr++; len--;
3754                                                         MOVE_UP(src3); iptr++; len--;
3755
3756                                                         COPY_DOWN(curstack, dst2); iptr++; len--;
3757                                                         COPY_DOWN(curstack->prev, dst1);
3758
3759                                                         coalescing_boundary = sd.new;
3760                                                 }
3761                                                 break;
3762
3763                                                 /* pop 3 push 4 dup */
3764
3765                                         case ICMD_DUP_X2:
3766                                                 REQUIRE(2);
3767                                                 if (IS_2_WORD_TYPE(curstack->prev->type)) {
3768                                                         /* ..., cat2, ???? */
3769 #ifdef ENABLE_VERIFIER
3770                                                         if (opt_verify) {
3771                                                                 if (IS_2_WORD_TYPE(curstack->type))
3772                                                                         goto throw_stack_category_error;
3773                                                         }
3774 #endif
3775                                                         iptr->opc = ICMD_DUP_X1;
3776                                                         goto icmd_DUP_X1;
3777                                                 }
3778                                                 else {
3779                                                         /* ..., cat1, ???? */
3780 #ifdef ENABLE_VERIFIER
3781                                                         if (opt_verify) {
3782                                                                 REQUIRE(3);
3783                                                                 if (IS_2_WORD_TYPE(curstack->type)
3784                                                                         || IS_2_WORD_TYPE(curstack->prev->prev->type))
3785                                                                                         goto throw_stack_category_error;
3786                                                         }
3787 #endif
3788 icmd_DUP_X2:
3789                                                         src1 = curstack->prev->prev;
3790                                                         src2 = curstack->prev;
3791                                                         src3 = curstack;
3792                                                         POPANY; POPANY; POPANY;
3793                                                         stackdepth -= 3;
3794
3795                                                         /* move non-temporary sources out of the way */
3796                                                         if (!IS_TEMPVAR(src2)) {
3797                                                                 MOVE_TO_TEMP(src2); iptr++; len--;
3798                                                         }
3799                                                         if (!IS_TEMPVAR(src3)) {
3800                                                                 MOVE_TO_TEMP(src3); iptr++; len--;
3801                                                         }
3802
3803                                                         DUP_SLOT(src3); dst1 = curstack; stackdepth++;
3804
3805                                                         MOVE_UP(src1); iptr++; len--;
3806                                                         MOVE_UP(src2); iptr++; len--;
3807                                                         MOVE_UP(src3); iptr++; len--;
3808
3809                                                         COPY_DOWN(curstack, dst1);
3810
3811                                                         coalescing_boundary = sd.new;
3812                                                 }
3813                                                 break;
3814
3815                                         case ICMD_DUP2_X2:
3816                                                 REQUIRE(2);
3817                                                 if (IS_2_WORD_TYPE(curstack->type)) {
3818                                                         /* ..., ????, cat2 */
3819                                                         if (IS_2_WORD_TYPE(curstack->prev->type)) {
3820                                                                 /* ..., cat2, cat2 */
3821                                                                 iptr->opc = ICMD_DUP_X1;
3822                                                                 goto icmd_DUP_X1;
3823                                                         }
3824                                                         else {
3825                                                                 /* ..., cat1, cat2 */
3826 #ifdef ENABLE_VERIFIER
3827                                                                 if (opt_verify) {
3828                                                                         REQUIRE(3);
3829                                                                         if (IS_2_WORD_TYPE(curstack->prev->prev->type))
3830                                                                                         goto throw_stack_category_error;
3831                                                                 }
3832 #endif
3833                                                                 iptr->opc = ICMD_DUP_X2;
3834                                                                 goto icmd_DUP_X2;
3835                                                         }
3836                                                 }
3837
3838                                                 REQUIRE(3);
3839                                                 /* ..., ????, ????, cat1 */
3840
3841                                                 if (IS_2_WORD_TYPE(curstack->prev->prev->type)) {
3842                                                         /* ..., cat2, ????, cat1 */
3843 #ifdef ENABLE_VERIFIER
3844                                                         if (opt_verify) {
3845                                                                 if (IS_2_WORD_TYPE(curstack->prev->type))
3846                                                                         goto throw_stack_category_error;
3847                                                         }
3848 #endif
3849                                                         iptr->opc = ICMD_DUP2_X1;
3850                                                         goto icmd_DUP2_X1;
3851                                                 }
3852                                                 else {
3853                                                         /* ..., cat1, ????, cat1 */
3854 #ifdef ENABLE_VERIFIER
3855                                                         if (opt_verify) {
3856                                                                 REQUIRE(4);
3857                                                                 if (IS_2_WORD_TYPE(curstack->prev->type)
3858                                                                         || IS_2_WORD_TYPE(curstack->prev->prev->prev->type))
3859                                                                         goto throw_stack_category_error;
3860                                                         }
3861 #endif
3862
3863                                                         src1 = curstack->prev->prev->prev;
3864                                                         src2 = curstack->prev->prev;
3865                                                         src3 = curstack->prev;
3866                                                         src4 = curstack;
3867                                                         POPANY; POPANY; POPANY; POPANY;
3868                                                         stackdepth -= 4;
3869
3870                                                         /* move non-temporary sources out of the way */
3871                                                         if (!IS_TEMPVAR(src2)) {
3872                                                                 MOVE_TO_TEMP(src2); iptr++; len--;
3873                                                         }
3874                                                         if (!IS_TEMPVAR(src3)) {
3875                                                                 MOVE_TO_TEMP(src3); iptr++; len--;
3876                                                         }
3877                                                         if (!IS_TEMPVAR(src4)) {
3878                                                                 MOVE_TO_TEMP(src4); iptr++; len--;
3879                                                         }
3880
3881                                                         DUP_SLOT(src3); dst1 = curstack; stackdepth++;
3882                                                         DUP_SLOT(src4); dst2 = curstack; stackdepth++;
3883
3884                                                         MOVE_UP(src1); iptr++; len--;
3885                                                         MOVE_UP(src2); iptr++; len--;
3886                                                         MOVE_UP(src3); iptr++; len--;
3887                                                         MOVE_UP(src4); iptr++; len--;
3888
3889                                                         COPY_DOWN(curstack, dst2); iptr++; len--;
3890                                                         COPY_DOWN(curstack->prev, dst1);
3891
3892                                                         coalescing_boundary = sd.new;
3893                                                 }
3894                                                 break;
3895
3896                                                 /* pop 2 push 2 swap */
3897
3898                                         case ICMD_SWAP:
3899 #ifdef ENABLE_VERIFIER
3900                                                 if (opt_verify) {
3901                                                         REQUIRE(2);
3902                                                         if (IS_2_WORD_TYPE(curstack->type)
3903                                                                 || IS_2_WORD_TYPE(curstack->prev->type))
3904                                                                 goto throw_stack_category_error;
3905                                                 }
3906 #endif
3907
3908                                                 src1 = curstack->prev;
3909                                                 src2 = curstack;
3910                                                 POPANY; POPANY;
3911                                                 stackdepth -= 2;
3912
3913                                                 /* move non-temporary sources out of the way */
3914                                                 if (!IS_TEMPVAR(src1)) {
3915                                                         MOVE_TO_TEMP(src1); iptr++; len--;
3916                                                 }
3917
3918                                                 MOVE_UP(src2); iptr++; len--;
3919                                                 MOVE_UP(src1);
3920
3921                                                 coalescing_boundary = sd.new;
3922                                                 break;
3923
3924                                                 /* pop 2 push 1 */
3925
3926                                         case ICMD_IDIV:
3927                                         case ICMD_IREM:
3928                                                 coalescing_boundary = sd.new;
3929 #if !SUPPORT_DIVISION
3930                                                 bte = iptr->sx.s23.s3.bte;
3931                                                 md = bte->md;
3932
3933                                                 if (md->memuse > rd->memuse)
3934                                                         rd->memuse = md->memuse;
3935                                                 if (md->argintreguse > rd->argintreguse)
3936                                                         rd->argintreguse = md->argintreguse;
3937
3938                                                 /* make all stack variables saved */
3939
3940                                                 copy = curstack;
3941                                                 while (copy) {
3942                                                         sd.var[copy->varnum].flags |= SAVEDVAR;
3943                                                         copy->flags |= SAVEDVAR;
3944                                                         copy = copy->prev;
3945                                                 }
3946                                                 /* FALLTHROUGH */
3947
3948 #endif /* !SUPPORT_DIVISION */
3949
3950                                         case ICMD_ISHL:
3951                                         case ICMD_ISHR:
3952                                         case ICMD_IUSHR:
3953                                         case ICMD_IADD:
3954                                         case ICMD_ISUB:
3955                                         case ICMD_IMUL:
3956                                         case ICMD_IAND:
3957                                         case ICMD_IOR:
3958                                         case ICMD_IXOR:
3959                                                 COUNT(count_pcmd_op);
3960                                                 OP2_1(TYPE_INT, TYPE_INT, TYPE_INT);
3961                                                 break;
3962
3963                                         case ICMD_LDIV:
3964                                         case ICMD_LREM:
3965                                                 coalescing_boundary = sd.new;
3966 #if !(SUPPORT_DIVISION && SUPPORT_LONG && SUPPORT_LONG_DIV)
3967                                                 bte = iptr->sx.s23.s3.bte;
3968                                                 md = bte->md;
3969
3970                                                 if (md->memuse > rd->memuse)
3971                                                         rd->memuse = md->memuse;
3972                                                 if (md->argintreguse > rd->argintreguse)
3973                                                         rd->argintreguse = md->argintreguse;
3974                                                 /* XXX non-leaf method? */
3975
3976                                                 /* make all stack variables saved */
3977
3978                                                 copy = curstack;
3979                                                 while (copy) {
3980                                                         sd.var[copy->varnum].flags |= SAVEDVAR;
3981                                                         copy->flags |= SAVEDVAR;
3982                                                         copy = copy->prev;
3983                                                 }
3984                                                 /* FALLTHROUGH */
3985
3986 #endif /* !(SUPPORT_DIVISION && SUPPORT_LONG && SUPPORT_LONG_DIV) */
3987
3988                                         case ICMD_LMUL:
3989                                         case ICMD_LADD:
3990                                         case ICMD_LSUB:
3991 #if SUPPORT_LONG_LOGICAL
3992                                         case ICMD_LAND:
3993                                         case ICMD_LOR:
3994                                         case ICMD_LXOR:
3995 #endif /* SUPPORT_LONG_LOGICAL */
3996                                                 COUNT(count_pcmd_op);
3997                                                 OP2_1(TYPE_LNG, TYPE_LNG, TYPE_LNG);
3998                                                 break;
3999
4000                                         case ICMD_LSHL:
4001                                         case ICMD_LSHR:
4002                                         case ICMD_LUSHR:
4003                                                 COUNT(count_pcmd_op);
4004                                                 OP2_1(TYPE_LNG, TYPE_INT, TYPE_LNG);
4005                                                 break;
4006
4007                                         case ICMD_FADD:
4008                                         case ICMD_FSUB:
4009                                         case ICMD_FMUL:
4010                                         case ICMD_FDIV:
4011                                         case ICMD_FREM:
4012                                                 COUNT(count_pcmd_op);
4013                                                 OP2_1(TYPE_FLT, TYPE_FLT, TYPE_FLT);
4014                                                 break;
4015
4016                                         case ICMD_DADD:
4017                                         case ICMD_DSUB:
4018                                         case ICMD_DMUL:
4019                                         case ICMD_DDIV:
4020                                         case ICMD_DREM:
4021                                                 COUNT(count_pcmd_op);
4022                                                 OP2_1(TYPE_DBL, TYPE_DBL, TYPE_DBL);
4023                                                 break;
4024
4025                                         case ICMD_LCMP:
4026                                                 COUNT(count_pcmd_op);
4027 #if SUPPORT_LONG_CMP_CONST
4028                                                 if ((len == 0) || (iptr[1].sx.val.i != 0))
4029                                                         goto normal_LCMP;
4030
4031                                                 switch (iptr[1].opc) {
4032                                                 case ICMD_IFEQ:
4033                                                         iptr->opc = ICMD_IF_LCMPEQ;
4034                                                 icmd_lcmp_if_tail:
4035                                                         iptr->dst.block = iptr[1].dst.block;
4036                                                         iptr[1].opc = ICMD_NOP;
4037
4038                                                         OP2_BRANCH(TYPE_LNG, TYPE_LNG);
4039                                                         BRANCH(tbptr);
4040
4041                                                         COUNT(count_pcmd_bra);
4042                                                         break;
4043                                                 case ICMD_IFNE:
4044                                                         iptr->opc = ICMD_IF_LCMPNE;
4045                                                         goto icmd_lcmp_if_tail;
4046                                                 case ICMD_IFLT:
4047                                                         iptr->opc = ICMD_IF_LCMPLT;
4048                                                         goto icmd_lcmp_if_tail;
4049                                                 case ICMD_IFGT:
4050                                                         iptr->opc = ICMD_IF_LCMPGT;
4051                                                         goto icmd_lcmp_if_tail;
4052                                                 case ICMD_IFLE:
4053                                                         iptr->opc = ICMD_IF_LCMPLE;
4054                                                         goto icmd_lcmp_if_tail;
4055                                                 case ICMD_IFGE:
4056                                                         iptr->opc = ICMD_IF_LCMPGE;
4057                                                         goto icmd_lcmp_if_tail;
4058                                                 default:
4059                                                         goto normal_LCMP;
4060                                                 }
4061                                                 break;
4062 normal_LCMP:
4063 #endif /* SUPPORT_LONG_CMP_CONST */
4064                                                         OP2_1(TYPE_LNG, TYPE_LNG, TYPE_INT);
4065                                                 break;
4066
4067                                                 /* XXX why is this deactivated? */
4068 #if 0
4069                                         case ICMD_FCMPL:
4070                                                 COUNT(count_pcmd_op);
4071                                                 if ((len == 0) || (iptr[1].sx.val.i != 0))
4072                                                         goto normal_FCMPL;
4073
4074                                                 switch (iptr[1].opc) {
4075                                                 case ICMD_IFEQ:
4076                                                         iptr->opc = ICMD_IF_FCMPEQ;
4077                                                 icmd_if_fcmpl_tail:
4078                                                         iptr->dst.block = iptr[1].dst.block;
4079                                                         iptr[1].opc = ICMD_NOP;
4080
4081                                                         OP2_BRANCH(TYPE_FLT, TYPE_FLT);
4082                                                         BRANCH(tbptr);
4083
4084                                                         COUNT(count_pcmd_bra);
4085                                                         break;
4086                                                 case ICMD_IFNE:
4087                                                         iptr->opc = ICMD_IF_FCMPNE;
4088                                                         goto icmd_if_fcmpl_tail;
4089                                                 case ICMD_IFLT:
4090                                                         iptr->opc = ICMD_IF_FCMPL_LT;
4091                                                         goto icmd_if_fcmpl_tail;
4092                                                 case ICMD_IFGT:
4093                                                         iptr->opc = ICMD_IF_FCMPL_GT;
4094                                                         goto icmd_if_fcmpl_tail;
4095                                                 case ICMD_IFLE:
4096                                                         iptr->opc = ICMD_IF_FCMPL_LE;
4097                                                         goto icmd_if_fcmpl_tail;
4098                                                 case ICMD_IFGE:
4099                                                         iptr->opc = ICMD_IF_FCMPL_GE;
4100                                                         goto icmd_if_fcmpl_tail;
4101                                                 default:
4102                                                         goto normal_FCMPL;
4103                                                 }
4104                                                 break;
4105
4106 normal_FCMPL:
4107                                                 OPTT2_1(TYPE_FLT, TYPE_FLT, TYPE_INT);
4108                                                 break;
4109
4110                                         case ICMD_FCMPG:
4111                                                 COUNT(count_pcmd_op);
4112                                                 if ((len == 0) || (iptr[1].sx.val.i != 0))
4113                                                         goto normal_FCMPG;
4114
4115                                                 switch (iptr[1].opc) {
4116                                                 case ICMD_IFEQ:
4117                                                         iptr->opc = ICMD_IF_FCMPEQ;
4118                                                 icmd_if_fcmpg_tail:
4119                                                         iptr->dst.block = iptr[1].dst.block;
4120                                                         iptr[1].opc = ICMD_NOP;
4121
4122                                                         OP2_BRANCH(TYPE_FLT, TYPE_FLT);
4123                                                         BRANCH(tbptr);
4124
4125                                                         COUNT(count_pcmd_bra);
4126                                                         break;
4127                                                 case ICMD_IFNE:
4128                                                         iptr->opc = ICMD_IF_FCMPNE;
4129                                                         goto icmd_if_fcmpg_tail;
4130                                                 case ICMD_IFLT:
4131                                                         iptr->opc = ICMD_IF_FCMPG_LT;
4132                                                         goto icmd_if_fcmpg_tail;
4133                                                 case ICMD_IFGT:
4134                                                         iptr->opc = ICMD_IF_FCMPG_GT;
4135                                                         goto icmd_if_fcmpg_tail;
4136                                                 case ICMD_IFLE:
4137                                                         iptr->opc = ICMD_IF_FCMPG_LE;
4138                                                         goto icmd_if_fcmpg_tail;
4139                                                 case ICMD_IFGE:
4140                                                         iptr->opc = ICMD_IF_FCMPG_GE;
4141                                                         goto icmd_if_fcmpg_tail;
4142                                                 default:
4143                                                         goto normal_FCMPG;
4144                                                 }
4145                                                 break;
4146
4147 normal_FCMPG:
4148                                                 OP2_1(TYPE_FLT, TYPE_FLT, TYPE_INT);
4149                                                 break;
4150
4151                                         case ICMD_DCMPL:
4152                                                 COUNT(count_pcmd_op);
4153                                                 if ((len == 0) || (iptr[1].sx.val.i != 0))
4154                                                         goto normal_DCMPL;
4155
4156                                                 switch (iptr[1].opc) {
4157                                                 case ICMD_IFEQ:
4158                                                         iptr->opc = ICMD_IF_DCMPEQ;
4159                                                 icmd_if_dcmpl_tail:
4160                                                         iptr->dst.block = iptr[1].dst.block;
4161                                                         iptr[1].opc = ICMD_NOP;
4162
4163                                                         OP2_BRANCH(TYPE_DBL, TYPE_DBL);
4164                                                         BRANCH(tbptr);
4165
4166                                                         COUNT(count_pcmd_bra);
4167                                                         break;
4168                                                 case ICMD_IFNE:
4169                                                         iptr->opc = ICMD_IF_DCMPNE;
4170                                                         goto icmd_if_dcmpl_tail;
4171                                                 case ICMD_IFLT:
4172                                                         iptr->opc = ICMD_IF_DCMPL_LT;
4173                                                         goto icmd_if_dcmpl_tail;
4174                                                 case ICMD_IFGT:
4175                                                         iptr->opc = ICMD_IF_DCMPL_GT;
4176                                                         goto icmd_if_dcmpl_tail;
4177                                                 case ICMD_IFLE:
4178                                                         iptr->opc = ICMD_IF_DCMPL_LE;
4179                                                         goto icmd_if_dcmpl_tail;
4180                                                 case ICMD_IFGE:
4181                                                         iptr->opc = ICMD_IF_DCMPL_GE;
4182                                                         goto icmd_if_dcmpl_tail;
4183                                                 default:
4184                                                         goto normal_DCMPL;
4185                                                 }
4186                                                 break;
4187
4188 normal_DCMPL:
4189                                                 OPTT2_1(TYPE_DBL, TYPE_INT);
4190                                                 break;
4191
4192                                         case ICMD_DCMPG:
4193                                                 COUNT(count_pcmd_op);
4194                                                 if ((len == 0) || (iptr[1].sx.val.i != 0))
4195                                                         goto normal_DCMPG;
4196
4197                                                 switch (iptr[1].opc) {
4198                                                 case ICMD_IFEQ:
4199                                                         iptr->opc = ICMD_IF_DCMPEQ;
4200                                                 icmd_if_dcmpg_tail:
4201                                                         iptr->dst.block = iptr[1].dst.block;
4202                                                         iptr[1].opc = ICMD_NOP;
4203
4204                                                         OP2_BRANCH(TYPE_DBL, TYPE_DBL);
4205                                                         BRANCH(tbptr);
4206
4207                                                         COUNT(count_pcmd_bra);
4208                                                         break;
4209                                                 case ICMD_IFNE:
4210                                                         iptr->opc = ICMD_IF_DCMPNE;
4211                                                         goto icmd_if_dcmpg_tail;
4212                                                 case ICMD_IFLT:
4213                                                         iptr->opc = ICMD_IF_DCMPG_LT;
4214                                                         goto icmd_if_dcmpg_tail;
4215                                                 case ICMD_IFGT:
4216                                                         iptr->opc = ICMD_IF_DCMPG_GT;
4217                                                         goto icmd_if_dcmpg_tail;
4218                                                 case ICMD_IFLE:
4219                                                         iptr->opc = ICMD_IF_DCMPG_LE;
4220                                                         goto icmd_if_dcmpg_tail;
4221                                                 case ICMD_IFGE:
4222                                                         iptr->opc = ICMD_IF_DCMPG_GE;
4223                                                         goto icmd_if_dcmpg_tail;
4224                                                 default:
4225                                                         goto normal_DCMPG;
4226                                                 }
4227                                                 break;
4228
4229 normal_DCMPG:
4230                                                 OP2_1(TYPE_DBL, TYPE_DBL, TYPE_INT);
4231                                                 break;
4232 #else
4233                                         case ICMD_FCMPL:
4234                                         case ICMD_FCMPG:
4235                                                 COUNT(count_pcmd_op);
4236                                                 OP2_1(TYPE_FLT, TYPE_FLT, TYPE_INT);
4237                                                 break;
4238
4239                                         case ICMD_DCMPL:
4240                                         case ICMD_DCMPG:
4241                                                 COUNT(count_pcmd_op);
4242                                                 OP2_1(TYPE_DBL, TYPE_DBL, TYPE_INT);
4243                                                 break;
4244 #endif
4245
4246                                                 /* pop 1 push 1 */
4247
4248                                         case ICMD_INEG:
4249                                         case ICMD_INT2BYTE:
4250                                         case ICMD_INT2CHAR:
4251                                         case ICMD_INT2SHORT:
4252                                                 COUNT(count_pcmd_op);
4253                                                 OP1_1(TYPE_INT, TYPE_INT);
4254                                                 break;
4255                                         case ICMD_LNEG:
4256                                                 COUNT(count_pcmd_op);
4257                                                 OP1_1(TYPE_LNG, TYPE_LNG);
4258                                                 break;
4259                                         case ICMD_FNEG:
4260                                                 COUNT(count_pcmd_op);
4261                                                 OP1_1(TYPE_FLT, TYPE_FLT);
4262                                                 break;
4263                                         case ICMD_DNEG:
4264                                                 COUNT(count_pcmd_op);
4265                                                 OP1_1(TYPE_DBL, TYPE_DBL);
4266                                                 break;
4267
4268                                         case ICMD_I2L:
4269                                                 COUNT(count_pcmd_op);
4270                                                 OP1_1(TYPE_INT, TYPE_LNG);
4271                                                 break;
4272                                         case ICMD_I2F:
4273                                                 COUNT(count_pcmd_op);
4274                                                 OP1_1(TYPE_INT, TYPE_FLT);
4275                                                 break;
4276                                         case ICMD_I2D:
4277                                                 COUNT(count_pcmd_op);
4278                                                 OP1_1(TYPE_INT, TYPE_DBL);
4279                                                 break;
4280                                         case ICMD_L2I:
4281                                                 COUNT(count_pcmd_op);
4282                                                 OP1_1(TYPE_LNG, TYPE_INT);
4283                                                 break;
4284                                         case ICMD_L2F:
4285                                                 COUNT(count_pcmd_op);
4286                                                 OP1_1(TYPE_LNG, TYPE_FLT);
4287                                                 break;
4288                                         case ICMD_L2D:
4289                                                 COUNT(count_pcmd_op);
4290                                                 OP1_1(TYPE_LNG, TYPE_DBL);
4291                                                 break;
4292                                         case ICMD_F2I:
4293                                                 COUNT(count_pcmd_op);
4294                                                 OP1_1(TYPE_FLT, TYPE_INT);
4295                                                 break;
4296                                         case ICMD_F2L:
4297                                                 COUNT(count_pcmd_op);
4298                                                 OP1_1(TYPE_FLT, TYPE_LNG);
4299                                                 break;
4300                                         case ICMD_F2D:
4301                                                 COUNT(count_pcmd_op);
4302                                                 OP1_1(TYPE_FLT, TYPE_DBL);
4303                                                 break;
4304                                         case ICMD_D2I:
4305                                                 COUNT(count_pcmd_op);
4306                                                 OP1_1(TYPE_DBL, TYPE_INT);
4307                                                 break;
4308                                         case ICMD_D2L:
4309                                                 COUNT(count_pcmd_op);
4310                                                 OP1_1(TYPE_DBL, TYPE_LNG);
4311                                                 break;
4312                                         case ICMD_D2F:
4313                                                 COUNT(count_pcmd_op);
4314                                                 OP1_1(TYPE_DBL, TYPE_FLT);
4315                                                 break;
4316
4317                                         case ICMD_CHECKCAST:
4318                                                 coalescing_boundary = sd.new;
4319                                                 if (iptr->flags.bits & INS_FLAG_ARRAY) {
4320                                                         /* array type cast-check */
4321
4322                                                         bte = builtintable_get_internal(BUILTIN_arraycheckcast);
4323                                                         md = bte->md;
4324
4325                                                         if (md->memuse > rd->memuse)
4326                                                                 rd->memuse = md->memuse;
4327                                                         if (md->argintreguse > rd->argintreguse)
4328                                                                 rd->argintreguse = md->argintreguse;
4329
4330                                                         /* make all stack variables saved */
4331
4332                                                         copy = curstack;
4333                                                         while (copy) {
4334                                                                 sd.var[copy->varnum].flags |= SAVEDVAR;
4335                                                                 copy->flags |= SAVEDVAR;
4336                                                                 copy = copy->prev;
4337                                                         }
4338                                                 }
4339                                                 OP1_1(TYPE_ADR, TYPE_ADR);
4340                                                 break;
4341
4342                                         case ICMD_INSTANCEOF:
4343                                         case ICMD_ARRAYLENGTH:
4344                                                 coalescing_boundary = sd.new;
4345                                                 OP1_1(TYPE_ADR, TYPE_INT);
4346                                                 break;
4347
4348                                         case ICMD_NEWARRAY:
4349                                         case ICMD_ANEWARRAY:
4350                                                 coalescing_boundary = sd.new;
4351                                                 OP1_1(TYPE_INT, TYPE_ADR);
4352                                                 break;
4353
4354                                         case ICMD_GETFIELD:
4355                                                 coalescing_boundary = sd.new;
4356                                                 COUNT(count_check_null);
4357                                                 COUNT(count_pcmd_mem);
4358                                                 INSTRUCTION_GET_FIELDREF(iptr, fmiref);
4359                                                 OP1_1(TYPE_ADR, fmiref->parseddesc.fd->type);
4360                                                 break;
4361
4362                                                 /* pop 0 push 1 */
4363
4364                                         case ICMD_GETSTATIC:
4365                                                 coalescing_boundary = sd.new;
4366                                                 COUNT(count_pcmd_mem);
4367                                                 INSTRUCTION_GET_FIELDREF(iptr, fmiref);
4368                                                 OP0_1(fmiref->parseddesc.fd->type);
4369                                                 break;
4370
4371                                         case ICMD_NEW:
4372                                                 coalescing_boundary = sd.new;
4373                                                 OP0_1(TYPE_ADR);
4374                                                 break;
4375
4376                                         case ICMD_JSR:
4377                                                 OP0_1(TYPE_RET);
4378
4379                                                 tbptr = iptr->sx.s23.s3.jsrtarget.block;
4380                                                 tbptr->type = BBTYPE_SBR;
4381
4382                                                 assert(sd.bptr->next);  /* XXX exception */
4383                                                 sd.var[curstack->varnum].vv.retaddr = sd.bptr->next;
4384 #if defined(ENABLE_VERIFIER)
4385                                                 sd.var[curstack->varnum].SBRSTART = (void*) tbptr;
4386 #endif
4387
4388                                                 tbptr = stack_mark_reached(&sd, tbptr, curstack, stackdepth);
4389                                                 if (tbptr == NULL)
4390                                                         return false;
4391
4392                                                 iptr->sx.s23.s3.jsrtarget.block = tbptr;
4393
4394                                                 /* We need to check for overflow right here because
4395                                                  * the pushed value is poped afterwards */
4396                                                 CHECKOVERFLOW;
4397
4398                                                 superblockend = true;
4399                                                 /* XXX should not be marked as interface, as it does not need to be */
4400                                                 /* allocated. Same for the invar of the target. */
4401                                                 break;
4402
4403                                         /* pop many push any */
4404
4405                                         case ICMD_BUILTIN:
4406 icmd_BUILTIN:
4407                                                 bte = iptr->sx.s23.s3.bte;
4408                                                 md = bte->md;
4409                                                 goto _callhandling;
4410
4411                                         case ICMD_INVOKESTATIC:
4412                                         case ICMD_INVOKESPECIAL:
4413                                         case ICMD_INVOKEVIRTUAL:
4414                                         case ICMD_INVOKEINTERFACE:
4415                                                 COUNT(count_pcmd_met);
4416
4417                                                 /* Check for functions to replace with builtin
4418                                                  * functions. */
4419
4420                                                 if (builtintable_replace_function(iptr))
4421                                                         goto icmd_BUILTIN;
4422
4423                                                 INSTRUCTION_GET_METHODDESC(iptr, md);
4424                                                 /* XXX resurrect this COUNT? */
4425 /*                          if (lm->flags & ACC_STATIC) */
4426 /*                              {COUNT(count_check_null);} */
4427
4428                                         _callhandling:
4429
4430                                                 coalescing_boundary = sd.new;
4431
4432                                                 i = md->paramcount;
4433
4434                                                 if (md->memuse > rd->memuse)
4435                                                         rd->memuse = md->memuse;
4436                                                 if (md->argintreguse > rd->argintreguse)
4437                                                         rd->argintreguse = md->argintreguse;
4438                                                 if (md->argfltreguse > rd->argfltreguse)
4439                                                         rd->argfltreguse = md->argfltreguse;
4440
4441                                                 REQUIRE(i);
4442
4443                                                 iptr->s1.argcount = stackdepth;
4444                                                 iptr->sx.s23.s2.args = DMNEW(s4, stackdepth);
4445
4446                                                 copy = curstack;
4447                                                 for (i-- ; i >= 0; i--) {
4448                                                         iptr->sx.s23.s2.args[i] = copy->varnum;
4449
4450                                                         /* do not change STACKVARs or LOCALVARS to ARGVAR*/
4451                                                         /* ->  won't help anyway */
4452                                                         if (!(IS_INOUT(copy) || IS_LOCALVAR(copy))) {
4453
4454 #if defined(SUPPORT_PASS_FLOATARGS_IN_INTREGS)
4455                         /* If we pass float arguments in integer argument registers, we
4456                          * are not allowed to precolor them here. Floats have to be moved
4457                          * to this regs explicitly in codegen().
4458                          * Only arguments that are passed by stack anyway can be precolored
4459                          * (michi 2005/07/24) */
4460                                                         if (!(sd.var[copy->varnum].flags & SAVEDVAR) &&
4461                                                            (!IS_FLT_DBL_TYPE(copy->type)
4462                                                                 || md->params[i].inmemory)) {
4463 #else
4464                                                         if (!(sd.var[copy->varnum].flags & SAVEDVAR)) {
4465 #endif
4466
4467                                                                 SET_PREALLOC(copy);
4468
4469                                                                 if (md->params[i].inmemory) {
4470                                                                         sd.var[copy->varnum].vv.regoff =
4471                                                                                 md->params[i].regoff;
4472                                                                         sd.var[copy->varnum].flags |=
4473                                                                                 INMEMORY;
4474                                                                 }
4475                                                                 else {
4476                                                                         if (IS_FLT_DBL_TYPE(copy->type)) {
4477 #if defined(SUPPORT_PASS_FLOATARGS_IN_INTREGS)
4478                                                                                 assert(0); /* XXX is this assert ok? */
4479 #else
4480                                                                                 sd.var[copy->varnum].vv.regoff =
4481                                                                                         md->params[i].regoff;
4482 #endif /* SUPPORT_PASS_FLOATARGS_IN_INTREGS */
4483                                                                         }
4484                                                                         else {
4485 #if defined(SUPPORT_COMBINE_INTEGER_REGISTERS)
4486                                                                                 if (IS_2_WORD_TYPE(copy->type))
4487                                                                                         sd.var[copy->varnum].vv.regoff =
4488                         PACK_REGS(GET_LOW_REG(md->params[i].regoff),
4489                                           GET_HIGH_REG(md->params[i].regoff));
4490
4491                                                                                 else
4492 #endif /* SUPPORT_COMBINE_INTEGER_REGISTERS */
4493                                                                                         sd.var[copy->varnum].vv.regoff =
4494                                                                                                 md->params[i].regoff;
4495                                                                         }
4496                                                                 }
4497                                                         }
4498                                                         }
4499                                                         copy = copy->prev;
4500                                                 }
4501
4502                                                 /* deal with live-through stack slots "under" the */
4503                                                 /* arguments */
4504
4505                                                 i = md->paramcount;
4506
4507                                                 while (copy) {
4508                                                         iptr->sx.s23.s2.args[i++] = copy->varnum;
4509                                                         sd.var[copy->varnum].flags |= SAVEDVAR;
4510                                                         copy->flags |= SAVEDVAR | PASSTHROUGH;
4511                                                         copy = copy->prev;
4512                                                 }
4513
4514                                                 /* pop the arguments */
4515
4516                                                 i = md->paramcount;
4517
4518                                                 stackdepth -= i;
4519                                                 while (--i >= 0) {
4520                                                         POPANY;
4521                                                 }
4522
4523                                                 /* push the return value */
4524
4525                                                 if (md->returntype.type != TYPE_VOID) {
4526                                                         GET_NEW_VAR(sd, new_index, md->returntype.type);
4527                                                         DST(md->returntype.type, new_index);
4528                                                         stackdepth++;
4529                                                 }
4530                                                 break;
4531
4532                                         case ICMD_MULTIANEWARRAY:
4533                                                 coalescing_boundary = sd.new;
4534                                                 if (rd->argintreguse < MIN(3, INT_ARG_CNT))
4535                                                         rd->argintreguse = MIN(3, INT_ARG_CNT);
4536
4537                                                 i = iptr->s1.argcount;
4538
4539                                                 REQUIRE(i);
4540
4541                                                 iptr->sx.s23.s2.args = DMNEW(s4, i);
4542
4543 #if defined(SPECIALMEMUSE)
4544 # if defined(__DARWIN__)
4545                                                 if (rd->memuse < (i + INT_ARG_CNT +LA_SIZE_IN_POINTERS))
4546                                                         rd->memuse = i + LA_SIZE_IN_POINTERS + INT_ARG_CNT;
4547 # else
4548                                                 if (rd->memuse < (i + LA_SIZE_IN_POINTERS + 3))
4549                                                         rd->memuse = i + LA_SIZE_IN_POINTERS + 3;
4550 # endif
4551 #else
4552 # if defined(__I386__)
4553                                                 if (rd->memuse < i + 3)
4554                                                         rd->memuse = i + 3; /* n integer args spilled on stack */
4555 # elif defined(__MIPS__) && SIZEOF_VOID_P == 4
4556                                                 if (rd->memuse < i + 2)
4557                                                         rd->memuse = i + 2; /* 4*4 bytes callee save space */
4558 # else
4559                                                 if (rd->memuse < i)
4560                                                         rd->memuse = i; /* n integer args spilled on stack */
4561 # endif /* defined(__I386__) */
4562 #endif
4563                                                 copy = curstack;
4564                                                 while (--i >= 0) {
4565                                         /* check INT type here? Currently typecheck does this. */
4566                                                         iptr->sx.s23.s2.args[i] = copy->varnum;
4567                                                         if (!(sd.var[copy->varnum].flags & SAVEDVAR)
4568                                                                 && (!IS_INOUT(copy))
4569                                                                 && (!IS_LOCALVAR(copy)) ) {
4570                                                                 copy->varkind = ARGVAR;
4571                                                                 sd.var[copy->varnum].flags |=
4572                                                                         INMEMORY & PREALLOC;
4573 #if defined(SPECIALMEMUSE)
4574 # if defined(__DARWIN__)
4575                                                                 sd.var[copy->varnum].vv.regoff = i +
4576                                                                         LA_SIZE_IN_POINTERS + INT_ARG_CNT;
4577 # else
4578                                                                 sd.var[copy->varnum].vv.regoff = i +
4579                                                                         LA_SIZE_IN_POINTERS + 3;
4580 # endif
4581 #else
4582 # if defined(__I386__)
4583                                                                 sd.var[copy->varnum].vv.regoff = i + 3;
4584 # elif defined(__MIPS__) && SIZEOF_VOID_P == 4
4585                                                                 sd.var[copy->varnum].vv.regoff = i + 2;
4586 # else
4587                                                                 sd.var[copy->varnum].vv.regoff = i;
4588 # endif /* defined(__I386__) */
4589 #endif /* defined(SPECIALMEMUSE) */
4590                                                         }
4591                                                         copy = copy->prev;
4592                                                 }
4593                                                 while (copy) {
4594                                                         sd.var[copy->varnum].flags |= SAVEDVAR;
4595                                                         copy->flags |= SAVEDVAR;
4596                                                         copy = copy->prev;
4597                                                 }
4598
4599                                                 i = iptr->s1.argcount;
4600                                                 stackdepth -= i;
4601                                                 while (--i >= 0) {
4602                                                         POPANY;
4603                                                 }
4604                                                 GET_NEW_VAR(sd, new_index, TYPE_ADR);
4605                                                 DST(TYPE_ADR, new_index);
4606                                                 stackdepth++;
4607                                                 break;
4608
4609                                         default:
4610                                                 exceptions_throw_internalerror("Unknown ICMD %d during stack analysis",
4611                                                                                                            opcode);
4612                                                 return false;
4613                                         } /* switch */
4614
4615                                         CHECKOVERFLOW;
4616                                         iptr++;
4617                                 } /* while instructions */
4618
4619                                 /* show state after last instruction */
4620
4621 #if defined(STACK_VERBOSE)
4622                                 stack_verbose_show_state(&sd, NULL, curstack);
4623 #endif
4624
4625                                 /* stack slots at basic block end become interfaces */
4626
4627                                 sd.bptr->outdepth = stackdepth;
4628                                 sd.bptr->outvars = DMNEW(s4, stackdepth);
4629
4630                                 i = stackdepth - 1;
4631                                 for (copy = curstack; copy; i--, copy = copy->prev) {
4632                                         varinfo *v;
4633                                         s4 t;
4634
4635                                         /* with the new vars rd->interfaces will be removed */
4636                                         /* and all in and outvars have to be STACKVARS!     */
4637                                         /* in the moment i.e. SWAP with in and out vars can */
4638                                         /* create an unresolvable conflict */
4639
4640                                         SET_TEMPVAR(copy);
4641                                         t = copy->type;
4642
4643                                         v = sd.var + copy->varnum;
4644                                         v->flags |= INOUT;
4645
4646                                         /* do not allocate variables for returnAddresses */
4647
4648                                         if (t != TYPE_RET) {
4649                                                 if (jd->interface_map[i*5 + t].flags == UNUSED) {
4650                                                         /* no interface var until now for this depth and */
4651                                                         /* type */
4652                                                         jd->interface_map[i*5 + t].flags = v->flags;
4653                                                 }
4654                                                 else {
4655                                                         jd->interface_map[i*5 + t].flags |= v->flags;
4656                                                 }
4657                                         }
4658
4659                                         sd.bptr->outvars[i] = copy->varnum;
4660                                 }
4661
4662                                 /* check if interface slots at basic block begin must be saved */
4663
4664                                 for (i=0; i<sd.bptr->indepth; ++i) {
4665                                         varinfo *v = sd.var + sd.bptr->invars[i];
4666                                         s4 t;
4667
4668                                         t = v->type;
4669
4670                                         if (t != TYPE_RET) {
4671                                                 if (jd->interface_map[i*5 + t].flags == UNUSED) {
4672                                                         /* no interface var until now for this depth and */
4673                                                         /* type */
4674                                                         jd->interface_map[i*5 + t].flags = v->flags;
4675                                                 }
4676                                                 else {
4677                                                         jd->interface_map[i*5 + t].flags |= v->flags;
4678                                                 }
4679                                         }
4680                                 }
4681
4682                                 /* store the number of this block's variables */
4683
4684                                 sd.bptr->varcount = sd.vartop - sd.bptr->varstart;
4685
4686 #if defined(STACK_VERBOSE)
4687                                 stack_verbose_block_exit(&sd, superblockend);
4688 #endif
4689
4690                                 /* reach the following block, if any */
4691
4692                                 if (!superblockend)
4693                                         if (!stack_reach_next_block(&sd))
4694                                                 return false;
4695
4696                 } /* for blocks */
4697
4698         } while (sd.repeat && !deadcode);
4699
4700     /* reset locals of TYPE_RET|VOID to TYPE_ADR */
4701
4702     /* A local variable may be used as both a returnAddress and a reference */
4703     /* type variable, as we do not split variables between these types when */
4704     /* renaming locals. While returnAddresses have been eliminated now, we  */
4705     /* must assume that the variable is still used as TYPE_ADR.             */
4706     /* The only way that a local can be TYPE_VOID at this point, is that it */
4707     /* was a TYPE_RET variable for which incompatible returnAddresses were  */
4708     /* merged. Thus we must treat TYPE_VOID in the same way as TYPE_RET     */
4709     /* here.                                                                */
4710     /* XXX: It would be nice to remove otherwise unused returnAddress       */
4711     /*      variables from the local variable array, so they are not        */
4712     /*      allocated by simplereg. (For LSRA this is not needed).          */
4713
4714         for (i=0; i<sd.localcount; ++i) {
4715                 if (sd.var[i].type == TYPE_RET || sd.var[i].type == TYPE_VOID)
4716                         sd.var[i].type = TYPE_ADR;
4717         }
4718
4719         /* mark temporaries of TYPE_RET as PREALLOC to avoid allocation */
4720
4721         for (i=sd.localcount; i<sd.vartop; ++i) {
4722                 if (sd.var[i].type == TYPE_RET)
4723                         sd.var[i].flags |= PREALLOC;
4724         }
4725
4726         /* XXX hack to fix up the ranges of the cloned single-block handlers */
4727
4728         ex = jd->exceptiontable;
4729         for (; ex != NULL; ex = ex->down) {
4730                 if (ex->start == ex->end) {
4731                         assert(ex->end->next);
4732                         ex->end = ex->end->next;
4733                 }
4734         }
4735
4736         /* store number of created variables */
4737
4738         jd->vartop = sd.vartop;
4739
4740         /* gather statistics *****************************************************/
4741
4742 #if defined(ENABLE_STATISTICS)
4743         if (opt_stat) {
4744                 if (jd->basicblockcount > count_max_basic_blocks)
4745                         count_max_basic_blocks = jd->basicblockcount;
4746                 count_basic_blocks += jd->basicblockcount;
4747                 if (jd->instructioncount > count_max_javainstr)
4748                         count_max_javainstr = jd->instructioncount;
4749                 count_javainstr += jd->instructioncount;
4750                 if (jd->stackcount > count_upper_bound_new_stack)
4751                         count_upper_bound_new_stack = jd->stackcount;
4752                 if ((sd.new - jd->stack) > count_max_new_stack)
4753                         count_max_new_stack = (sd.new - jd->stack);
4754
4755                 sd.bptr = jd->basicblocks;
4756                 for (; sd.bptr; sd.bptr = sd.bptr->next) {
4757                         if (sd.bptr->flags > BBREACHED) {
4758                                 if (sd.bptr->indepth >= 10)
4759                                         count_block_stack[10]++;
4760                                 else
4761                                         count_block_stack[sd.bptr->indepth]++;
4762                                 len = sd.bptr->icount;
4763                                 if (len < 10)
4764                                         count_block_size_distribution[len]++;
4765                                 else if (len <= 12)
4766                                         count_block_size_distribution[10]++;
4767                                 else if (len <= 14)
4768                                         count_block_size_distribution[11]++;
4769                                 else if (len <= 16)
4770                                         count_block_size_distribution[12]++;
4771                                 else if (len <= 18)
4772                                         count_block_size_distribution[13]++;
4773                                 else if (len <= 20)
4774                                         count_block_size_distribution[14]++;
4775                                 else if (len <= 25)
4776                                         count_block_size_distribution[15]++;
4777                                 else if (len <= 30)
4778                                         count_block_size_distribution[16]++;
4779                                 else
4780                                         count_block_size_distribution[17]++;
4781                         }
4782                 }
4783
4784                 if (iteration_count == 1)
4785                         count_analyse_iterations[0]++;
4786                 else if (iteration_count == 2)
4787                         count_analyse_iterations[1]++;
4788                 else if (iteration_count == 3)
4789                         count_analyse_iterations[2]++;
4790                 else if (iteration_count == 4)
4791                         count_analyse_iterations[3]++;
4792                 else
4793                         count_analyse_iterations[4]++;
4794
4795                 if (jd->basicblockcount <= 5)
4796                         count_method_bb_distribution[0]++;
4797                 else if (jd->basicblockcount <= 10)
4798                         count_method_bb_distribution[1]++;
4799                 else if (jd->basicblockcount <= 15)
4800                         count_method_bb_distribution[2]++;
4801                 else if (jd->basicblockcount <= 20)
4802                         count_method_bb_distribution[3]++;
4803                 else if (jd->basicblockcount <= 30)
4804                         count_method_bb_distribution[4]++;
4805                 else if (jd->basicblockcount <= 40)
4806                         count_method_bb_distribution[5]++;
4807                 else if (jd->basicblockcount <= 50)
4808                         count_method_bb_distribution[6]++;
4809                 else if (jd->basicblockcount <= 75)
4810                         count_method_bb_distribution[7]++;
4811                 else
4812                         count_method_bb_distribution[8]++;
4813         }
4814 #endif /* defined(ENABLE_STATISTICS) */
4815
4816         /* everything's ok *******************************************************/
4817
4818         return true;
4819
4820         /* goto labels for throwing verifier exceptions **************************/
4821
4822 #if defined(ENABLE_VERIFIER)
4823
4824 throw_stack_underflow:
4825         exceptions_throw_verifyerror(m, "Unable to pop operand off an empty stack");
4826         return false;
4827
4828 throw_stack_overflow:
4829         exceptions_throw_verifyerror(m, "Stack size too large");
4830         return false;
4831
4832 throw_stack_type_error:
4833         exceptions_throw_verifyerror_for_stack(m, expectedtype);
4834         return false;
4835
4836 throw_stack_category_error:
4837         exceptions_throw_verifyerror(m, "Attempt to split long or double on the stack");
4838         return false;
4839
4840 #endif
4841 }
4842
4843
4844 /* stack_javalocals_store ******************************************************
4845
4846    Model the effect of a ?STORE instruction upon the given javalocals array.
4847
4848    IN:
4849        iptr.............the ?STORE instruction
4850            javalocals.......the javalocals array to modify
4851
4852 *******************************************************************************/
4853
4854 void stack_javalocals_store(instruction *iptr, s4 *javalocals)
4855 {
4856         s4 idx;  /* index into the jd->var array */
4857         s4 j;    /* java local index             */
4858
4859         idx = iptr->dst.varindex;
4860         j = iptr->sx.s23.s3.javaindex;
4861
4862         if (j != UNUSED) {
4863                 if (iptr->flags.bits & INS_FLAG_RETADDR)
4864                         javalocals[j] = iptr->sx.s23.s2.retaddrnr;
4865                 else
4866                         javalocals[j] = idx;
4867
4868                 if (iptr->flags.bits & INS_FLAG_KILL_PREV)
4869                         javalocals[j-1] = UNUSED;
4870
4871                 if (iptr->flags.bits & INS_FLAG_KILL_NEXT)
4872                         javalocals[j+1] = UNUSED;
4873         }
4874 }
4875
4876
4877 /* functions for verbose stack analysis output ********************************/
4878
4879 #if defined(STACK_VERBOSE)
4880 static void stack_verbose_show_varinfo(stackdata_t *sd, varinfo *v)
4881 {
4882         printf("%c", show_jit_type_letters[v->type]);
4883         if (v->type == TYPE_RET) {
4884                 printf("{L%03d}", v->vv.retaddr->nr);
4885 #if defined(ENABLE_VERIFIER)
4886                 printf("{start=L%03d}", ((basicblock *)v->SBRSTART)->nr);
4887 #endif
4888         }
4889 }
4890
4891
4892 static void stack_verbose_show_variable(stackdata_t *sd, s4 index)
4893 {
4894         assert(index >= 0 && index < sd->vartop);
4895         stack_verbose_show_varinfo(sd, sd->var + index);
4896 }
4897
4898
4899 static void stack_verbose_show_block(stackdata_t *sd, basicblock *bptr)
4900 {
4901         s4 i;
4902
4903         printf("L%03d type:%d in:%d [", bptr->nr, bptr->type, bptr->indepth);
4904         if (bptr->invars) {
4905                 for (i=0; i<bptr->indepth; ++i) {
4906                         if (i)
4907                                 putchar(' ');
4908                         stack_verbose_show_variable(sd, bptr->invars[i]);
4909                 }
4910         }
4911         else
4912                 putchar('-');
4913         printf("] javalocals ");
4914         show_javalocals_array(sd->jd, sd->javalocals, sd->maxlocals, SHOW_STACK);
4915         printf(" inlocals [");
4916         if (bptr->inlocals) {
4917                 for (i=0; i<sd->localcount; ++i) {
4918                         if (i)
4919                                 putchar(' ');
4920                         stack_verbose_show_varinfo(sd, bptr->inlocals + i);
4921                 }
4922         }
4923         else
4924                 putchar('-');
4925         printf("] out:%d [", bptr->outdepth);
4926         if (bptr->outvars) {
4927                 for (i=0; i<bptr->outdepth; ++i) {
4928                         if (i)
4929                                 putchar(' ');
4930                         stack_verbose_show_variable(sd, bptr->outvars[i]);
4931                 }
4932         }
4933         else
4934                 putchar('-');
4935         printf("]");
4936
4937         if (bptr->original)
4938                 printf(" (clone of L%03d)", bptr->original->nr);
4939         else {
4940                 basicblock *b = bptr->copied_to;
4941                 if (b) {
4942                         printf(" (copied to ");
4943                         for (; b; b = b->copied_to)
4944                                 printf("L%03d ", b->nr);
4945                         printf(")");
4946                 }
4947         }
4948 }
4949
4950
4951 static void stack_verbose_block_enter(stackdata_t *sd, bool reanalyse)
4952 {
4953         int i;
4954
4955         printf("======================================== STACK %sANALYSE BLOCK ",
4956                         (reanalyse) ? ((sd->bptr->iinstr == NULL) ? "CLONE-" : "RE-") : "");
4957         stack_verbose_show_block(sd, sd->bptr);
4958         printf("\n");
4959
4960         if (sd->handlers[0]) {
4961                 printf("HANDLERS: ");
4962                 for (i=0; sd->handlers[i]; ++i) {
4963                         printf("L%03d ", sd->handlers[i]->handler->nr);
4964                 }
4965                 printf("\n");
4966         }
4967         printf("\n");
4968 }
4969
4970
4971 static void stack_verbose_block_exit(stackdata_t *sd, bool superblockend)
4972 {
4973         printf("%s ", (superblockend) ? "SUPERBLOCKEND" : "END");
4974         stack_verbose_show_block(sd, sd->bptr);
4975         printf("\n");
4976 }
4977
4978 static void stack_verbose_show_state(stackdata_t *sd, instruction *iptr, stackptr curstack)
4979 {
4980         stackptr sp;
4981         s4       i;
4982         s4       depth;
4983         varinfo *v;
4984         stackptr *stack;
4985
4986         printf("    javalocals ");
4987         show_javalocals_array(sd->jd, sd->javalocals, sd->maxlocals, SHOW_STACK);
4988         printf(" stack [");
4989
4990         for(i = 0, sp = curstack; sp; sp = sp->prev)
4991                 i++;
4992         depth = i;
4993
4994         stack = MNEW(stackptr, depth);
4995         for(sp = curstack; sp; sp = sp->prev)
4996                 stack[--i] = sp;
4997
4998         for(i=0; i<depth; ++i) {
4999                 if (i)
5000                         putchar(' ');
5001                 sp = stack[i];
5002                 v = &(sd->var[sp->varnum]);
5003
5004                 if (v->flags & INOUT)
5005                         putchar('I');
5006                 if (v->flags & PREALLOC)
5007                         putchar('A');
5008                 printf("%d:%c", sp->varnum, show_jit_type_letters[sp->type]);
5009                 if (v->type == TYPE_RET) {
5010                         printf("(L%03d)", v->vv.retaddr->nr);
5011                 }
5012         }
5013         printf("] ... ");
5014         if (iptr)
5015                 show_icmd(sd->jd, iptr, false, SHOW_PARSE);
5016         printf("\n");
5017 }
5018 #endif
5019
5020
5021 /*
5022  * These are local overrides for various environment variables in Emacs.
5023  * Please do not remove this and leave it at the end of the file, where
5024  * Emacs will automagically detect them.
5025  * ---------------------------------------------------------------------
5026  * Local variables:
5027  * mode: c
5028  * indent-tabs-mode: t
5029  * c-basic-offset: 4
5030  * tab-width: 4
5031  * End:
5032  * vim:noexpandtab:sw=4:ts=4:
5033  */