src/vm/jit/verify/typecheck.c

   1 /* vm/jit/verify/typecheck.c - typechecking (part of bytecode verification)
   2
   3    Copyright (C) 1996-2005 R. Grafl, A. Krall, C. Kruegel, C. Oates,
   4    R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner,
   5    C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger,
   6    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., 59 Temple Place - Suite 330, Boston, MA
  23    02111-1307, USA.
  24
  25    Contact: cacao@complang.tuwien.ac.at
  26
  27    Authors: Edwin Steiner
  28
  29    $Id: typecheck.c 1795 2004-12-21 15:15:26Z jowenn $
  30
  31 */
  32
  33 #include <string.h>
  34
  35 #include "vm/global.h" /* must be here because of CACAO_TYPECHECK */
  36
  37 #ifdef CACAO_TYPECHECK
  38
  39 #include "types.h"
  40 /*  #include "main.h" */
  41 #include "mm/memory.h"
  42 #include "toolbox/logging.h"
  43 #include "native/native.h"
  44 #include "vm/builtin.h"
  45 #include "vm/loader.h"
  46 #include "vm/options.h"
  47 #include "vm/tables.h"
  48 #include "vm/jit/jit.h"
  49 #include "vm/jit/stack.h"
  50
  51
  52 /****************************************************************************/
  53 /* DEBUG HELPERS                                                            */
  54 /****************************************************************************/
  55
  56 #ifdef TYPECHECK_VERBOSE_OPT
  57 bool typecheckverbose = false;
  58 #define DOLOG(action)  do { if (typecheckverbose) {action;} } while(0)
  59 #else
  60 #define DOLOG(action)
  61 #endif
  62
  63 #ifdef TYPECHECK_VERBOSE
  64 #define TYPECHECK_VERBOSE_IMPORTANT
  65 #define LOG(str)           DOLOG(log_text(str))
  66 #define LOG1(str,a)        DOLOG(dolog(str,a))
  67 #define LOG2(str,a,b)      DOLOG(dolog(str,a,b))
  68 #define LOG3(str,a,b,c)    DOLOG(dolog(str,a,b,c))
  69 #define LOGIF(cond,str)    DOLOG(do {if (cond) log_text(str);} while(0))
  70 #ifdef  TYPEINFO_DEBUG
  71 #define LOGINFO(info)      DOLOG(do {typeinfo_print_short(get_logfile(),(info));log_plain("\n");} while(0))
  72 #else
  73 #define LOGINFO(info)
  74 #define typevectorset_print(x,y,z)
  75 #endif
  76 #define LOGFLUSH           DOLOG(fflush(get_logfile()))
  77 #define LOGNL              DOLOG(log_plain("\n"))
  78 #define LOGSTR(str)        DOLOG(log_plain(str))
  79 #define LOGSTR1(str,a)     DOLOG(dolog_plain(str,a))
  80 #define LOGSTR2(str,a,b)   DOLOG(dolog_plain(str,a,b))
  81 #define LOGSTR3(str,a,b,c) DOLOG(dolog_plain(str,a,b,c))
  82 #define LOGSTRu(utf)       DOLOG(log_plain_utf(utf))
  83 #else
  84 #define LOG(str)
  85 #define LOG1(str,a)
  86 #define LOG2(str,a,b)
  87 #define LOG3(str,a,b,c)
  88 #define LOGIF(cond,str)
  89 #define LOGINFO(info)
  90 #define LOGFLUSH
  91 #define LOGNL
  92 #define LOGSTR(str)
  93 #define LOGSTR1(str,a)
  94 #define LOGSTR2(str,a,b)
  95 #define LOGSTR3(str,a,b,c)
  96 #define LOGSTRu(utf)
  97 #endif
  98
  99 #ifdef TYPECHECK_VERBOSE_IMPORTANT
 100 #define LOGimp(str)     DOLOG(log_text(str))
 101 #define LOGimpSTR(str)  DOLOG(log_plain(str))
 102 #define LOGimpSTRu(utf) DOLOG(log_plain_utf(utf))
 103 #else
 104 #define LOGimp(str)
 105 #define LOGimpSTR(str)
 106 #define LOGimpSTRu(utf)
 107 #endif
 108
 109 #if defined(TYPECHECK_VERBOSE) || defined(TYPECHECK_VERBOSE_IMPORTANT)
 110
 111 #include <stdio.h>
 112
 113 static
 114 void
 115 typestack_print(FILE *file,stackptr stack)
 116 {
 117 #ifdef TYPEINFO_DEBUG
 118     while (stack) {
 119         typeinfo_print_stacktype(file,stack->type,&stack->typeinfo);
 120         stack = stack->prev;
 121         if (stack) fprintf(file," ");
 122     }
 123 #endif
 124 }
 125
 126 static
 127 void
 128 typestate_print(FILE *file,stackptr instack,typevector *localset,int size)
 129 {
 130     fprintf(file,"Stack: ");
 131     typestack_print(file,instack);
 132     fprintf(file," Locals:");
 133     typevectorset_print(file,localset,size);
 134 }
 135
 136 #endif
 137
 138 /****************************************************************************/
 139 /* STATISTICS                                                               */
 140 /****************************************************************************/
 141
 142 #ifdef TYPECHECK_DEBUG
 143 /*#define TYPECHECK_STATISTICS*/
 144 #endif
 145
 146 #ifdef TYPECHECK_STATISTICS
 147 #define STAT_ITERATIONS  10
 148 #define STAT_BLOCKS      10
 149 #define STAT_LOCALS      16
 150
 151 static int stat_typechecked = 0;
 152 static int stat_typechecked_jsr = 0;
 153 static int stat_iterations[STAT_ITERATIONS+1] = { 0 };
 154 static int stat_reached = 0;
 155 static int stat_copied = 0;
 156 static int stat_merged = 0;
 157 static int stat_merging_changed = 0;
 158 static int stat_backwards = 0;
 159 static int stat_blocks[STAT_BLOCKS+1] = { 0 };
 160 static int stat_locals[STAT_LOCALS+1] = { 0 };
 161 static int stat_ins = 0;
 162 static int stat_ins_field = 0;
 163 static int stat_ins_invoke = 0;
 164 static int stat_ins_primload = 0;
 165 static int stat_ins_aload = 0;
 166 static int stat_ins_builtin = 0;
 167 static int stat_ins_builtin_gen = 0;
 168 static int stat_ins_branch = 0;
 169 static int stat_ins_switch = 0;
 170 static int stat_ins_unchecked = 0;
 171 static int stat_handlers_reached = 0;
 172 static int stat_savedstack = 0;
 173
 174 #define TYPECHECK_COUNT(cnt)  (cnt)++
 175 #define TYPECHECK_COUNTIF(cond,cnt)  do{if(cond) (cnt)++;} while(0)
 176 #define TYPECHECK_COUNT_FREQ(array,val,limit) \
 177         do {                                                                      \
 178                 if ((val) < (limit)) (array)[val]++;  \
 179                 else (array)[limit]++;                            \
 180         } while (0)
 181
 182 static void print_freq(FILE *file,int *array,int limit)
 183 {
 184         int i;
 185         for (i=0; i<limit; ++i)
 186                 fprintf(file,"      %3d: %8d\n",i,array[i]);
 187         fprintf(file,"    =>%3d: %8d\n",limit,array[limit]);
 188 }
 189
 190 void typecheck_print_statistics(FILE *file) {
 191         fprintf(file,"typechecked methods: %8d\n",stat_typechecked);
 192         fprintf(file,"methods with JSR   : %8d\n",stat_typechecked_jsr);
 193         fprintf(file,"reached blocks     : %8d\n",stat_reached);
 194         fprintf(file,"copied states      : %8d\n",stat_copied);
 195         fprintf(file,"merged states      : %8d\n",stat_merged);
 196         fprintf(file,"merging changed    : %8d\n",stat_merging_changed);
 197         fprintf(file,"backwards branches : %8d\n",stat_backwards);
 198         fprintf(file,"handlers reached   : %8d\n",stat_handlers_reached);
 199         fprintf(file,"saved stack (times): %8d\n",stat_savedstack);
 200         fprintf(file,"instructions       : %8d\n",stat_ins);
 201         fprintf(file,"    field access   : %8d\n",stat_ins_field);
 202         fprintf(file,"    invocations    : %8d\n",stat_ins_invoke);
 203         fprintf(file,"    load primitive : %8d\n",stat_ins_primload);
 204         fprintf(file,"    load address   : %8d\n",stat_ins_aload);
 205         fprintf(file,"    builtins       : %8d\n",stat_ins_builtin);
 206         fprintf(file,"        generic    : %8d\n",stat_ins_builtin_gen);
 207         fprintf(file,"    unchecked      : %8d\n",stat_ins_unchecked);
 208         fprintf(file,"    branches       : %8d\n",stat_ins_branch);
 209         fprintf(file,"    switches       : %8d\n",stat_ins_switch);
 210         fprintf(file,"iterations used:\n");
 211         print_freq(file,stat_iterations,STAT_ITERATIONS);
 212         fprintf(file,"basic blocks per method / 10:\n");
 213         print_freq(file,stat_blocks,STAT_BLOCKS);
 214         fprintf(file,"locals:\n");
 215         print_freq(file,stat_locals,STAT_LOCALS);
 216 }
 217
 218 #else
 219
 220 #define TYPECHECK_COUNT(cnt)
 221 #define TYPECHECK_COUNTIF(cond,cnt)
 222 #define TYPECHECK_COUNT_FREQ(array,val,limit)
 223 #endif
 224
 225 /****************************************************************************/
 226 /* TYPESTACK FUNCTIONS                                                      */
 227 /****************************************************************************/
 228
 229 #define TYPESTACK_IS_RETURNADDRESS(sptr) \
 230             TYPE_IS_RETURNADDRESS((sptr)->type,(sptr)->typeinfo)
 231
 232 #define TYPESTACK_IS_REFERENCE(sptr) \
 233             TYPE_IS_REFERENCE((sptr)->type,(sptr)->typeinfo)
 234
 235 #define TYPESTACK_RETURNADDRESSSET(sptr) \
 236             ((typeinfo_retaddr_set*)TYPEINFO_RETURNADDRESS((sptr)->typeinfo))
 237
 238 #define RETURNADDRESSSET_SEEK(set,pos) \
 239             do {int i; for (i=pos;i--;) set=set->alt;} while(0)
 240
 241 #define TYPESTACK_COPY(sp,copy)                                                                 \
 242                 do {for(; sp; sp=sp->prev, copy=copy->prev) {           \
 243                                         copy->type = sp->type;                                          \
 244                                         TYPEINFO_COPY(sp->typeinfo,copy->typeinfo);     \
 245                                 }} while (0)                                                                    \
 246
 247 static void
 248 typestack_copy(stackptr dst,stackptr y,typevector *selected)
 249 {
 250         typevector *sel;
 251         typeinfo_retaddr_set *sety;
 252         typeinfo_retaddr_set *new;
 253         typeinfo_retaddr_set **next;
 254         int k;
 255
 256         for (;dst; dst=dst->prev, y=y->prev) {
 257                 if (!y) panic("Stack depth mismatch 1");
 258                 if (dst->type != y->type)
 259                         panic("Stack type mismatch 1");
 260                 LOG3("copy %p -> %p (type %d)",y,dst,dst->type);
 261                 if (dst->type == TYPE_ADDRESS) {
 262                         if (TYPEINFO_IS_PRIMITIVE(y->typeinfo)) {
 263                                 /* We copy the returnAddresses from the selected
 264                                  * states only. */
 265
 266                                 LOG("copying returnAddress");
 267                                 sety = TYPESTACK_RETURNADDRESSSET(y);
 268                                 next = &new;
 269                                 for (k=0,sel=selected; sel; sel=sel->alt) {
 270                                         LOG1("selected k=%d",sel->k);
 271                                         while (k<sel->k) {
 272                                                 sety = sety->alt;
 273                                                 k++;
 274                                         }
 275                                         *next = DNEW(typeinfo_retaddr_set);
 276                                         (*next)->addr = sety->addr;
 277                                         next = &((*next)->alt);
 278                                 }
 279                                 *next = NULL;
 280                                 TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,new);
 281                         }
 282                         else {
 283                                 TYPEINFO_CLONE(y->typeinfo,dst->typeinfo);
 284                         }
 285                 }
 286         }
 287         if (y) panic("Stack depth mismatch 2");
 288 }
 289
 290 static void
 291 typestack_put_retaddr(stackptr dst,void *retaddr,typevector *loc)
 292 {
 293 #ifdef TYPECHECK_DEBUG
 294         if (dst->type != TYPE_ADDRESS)
 295                 panic("Internal error: Storing returnAddress in non-address slot");
 296 #endif
 297
 298         TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,NULL);
 299         for (;loc; loc=loc->alt) {
 300                 typeinfo_retaddr_set *set = DNEW(typeinfo_retaddr_set);
 301                 set->addr = retaddr;
 302                 set->alt = TYPESTACK_RETURNADDRESSSET(dst);
 303                 TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,set);
 304         }
 305 }
 306
 307 static void
 308 typestack_collapse(stackptr dst)
 309 {
 310         for (; dst; dst = dst->prev) {
 311                 if (TYPESTACK_IS_RETURNADDRESS(dst))
 312                         TYPESTACK_RETURNADDRESSSET(dst)->alt = NULL;
 313         }
 314 }
 315
 316 static bool
 317 typestack_merge(stackptr dst,stackptr y)
 318 {
 319         bool changed = false;
 320         for (; dst; dst = dst->prev, y=y->prev) {
 321                 if (!y)
 322                         panic("Stack depth mismatch 3");
 323                 if (dst->type != y->type) panic("Stack type mismatch 2");
 324                 if (dst->type == TYPE_ADDRESS) {
 325                         if (TYPEINFO_IS_PRIMITIVE(dst->typeinfo)) {
 326                                 /* dst has returnAddress type */
 327                                 if (!TYPEINFO_IS_PRIMITIVE(y->typeinfo))
 328                                         panic("Merging returnAddress with reference");
 329                         }
 330                         else {
 331                                 /* dst has reference type */
 332                                 if (TYPEINFO_IS_PRIMITIVE(y->typeinfo))
 333                                         panic("Merging reference with returnAddress");
 334                                 changed |= typeinfo_merge(&(dst->typeinfo),&(y->typeinfo));
 335                         }
 336                 }
 337         }
 338         if (y) panic("Stack depth mismatch 4");
 339         return changed;
 340 }
 341
 342 static void
 343 typestack_add(stackptr dst,stackptr y,int ky)
 344 {
 345         typeinfo_retaddr_set *setd;
 346         typeinfo_retaddr_set *sety;
 347
 348         for (; dst; dst = dst->prev, y=y->prev) {
 349                 if (TYPESTACK_IS_RETURNADDRESS(dst)) {
 350                         setd = TYPESTACK_RETURNADDRESSSET(dst);
 351                         sety = TYPESTACK_RETURNADDRESSSET(y);
 352                         RETURNADDRESSSET_SEEK(sety,ky);
 353                         while (setd->alt)
 354                                 setd=setd->alt;
 355                         setd->alt = DNEW(typeinfo_retaddr_set);
 356                         setd->alt->addr = sety->addr;
 357                         setd->alt->alt = NULL;
 358                 }
 359         }
 360 }
 361
 362 /* 'a' and 'b' are assumed to have passed typestack_canmerge! */
 363 static bool
 364 typestack_separable_with(stackptr a,stackptr b,int kb)
 365 {
 366         typeinfo_retaddr_set *seta;
 367         typeinfo_retaddr_set *setb;
 368
 369         for (; a; a = a->prev, b = b->prev) {
 370 #ifdef TYPECHECK_DEBUG
 371                 if (!b) panic("Internal error: typestack_separable_from: different depth");
 372 #endif
 373                 if (TYPESTACK_IS_RETURNADDRESS(a)) {
 374 #ifdef TYPECHECK_DEBUG
 375                         if (!TYPESTACK_IS_RETURNADDRESS(b))
 376                                 panic("Internal error: typestack_separable_from: unmergable stacks");
 377 #endif
 378                         seta = TYPESTACK_RETURNADDRESSSET(a);
 379                         setb = TYPESTACK_RETURNADDRESSSET(b);
 380                         RETURNADDRESSSET_SEEK(setb,kb);
 381
 382                         for (;seta;seta=seta->alt)
 383                                 if (seta->addr != setb->addr) return true;
 384                 }
 385         }
 386 #ifdef TYPECHECK_DEBUG
 387         if (b) panic("Internal error: typestack_separable_from: different depth");
 388 #endif
 389         return false;
 390 }
 391
 392 /* 'a' and 'b' are assumed to have passed typestack_canmerge! */
 393 static bool
 394 typestack_separable_from(stackptr a,int ka,stackptr b,int kb)
 395 {
 396         typeinfo_retaddr_set *seta;
 397         typeinfo_retaddr_set *setb;
 398
 399         for (; a; a = a->prev, b = b->prev) {
 400 #ifdef TYPECHECK_DEBUG
 401                 if (!b) panic("Internal error: typestack_separable_from: different depth");
 402 #endif
 403                 if (TYPESTACK_IS_RETURNADDRESS(a)) {
 404 #ifdef TYPECHECK_DEBUG
 405                         if (!TYPESTACK_IS_RETURNADDRESS(b))
 406                                 panic("Internal error: typestack_separable_from: unmergable stacks");
 407 #endif
 408                         seta = TYPESTACK_RETURNADDRESSSET(a);
 409                         setb = TYPESTACK_RETURNADDRESSSET(b);
 410                         RETURNADDRESSSET_SEEK(seta,ka);
 411                         RETURNADDRESSSET_SEEK(setb,kb);
 412
 413                         if (seta->addr != setb->addr) return true;
 414                 }
 415         }
 416 #ifdef TYPECHECK_DEBUG
 417         if (b) panic("Internal error: typestack_separable_from: different depth");
 418 #endif
 419         return false;
 420 }
 421
 422 /****************************************************************************/
 423 /* TYPESTATE FUNCTIONS                                                      */
 424 /****************************************************************************/
 425
 426 static bool
 427 typestate_merge(stackptr deststack,typevector *destloc,
 428                                 stackptr ystack,typevector *yloc,
 429                                 int locsize,bool jsrencountered)
 430 {
 431         typevector *dvec,*yvec;
 432         int kd,ky;
 433         bool changed = false;
 434
 435         LOG("merge:");
 436         LOGSTR("dstack: "); DOLOG(typestack_print(get_logfile(),deststack)); LOGNL;
 437         LOGSTR("ystack: "); DOLOG(typestack_print(get_logfile(),ystack)); LOGNL;
 438         LOGSTR("dloc  : "); DOLOG(typevectorset_print(get_logfile(),destloc,locsize)); LOGNL;
 439         LOGSTR("yloc  : "); DOLOG(typevectorset_print(get_logfile(),yloc,locsize)); LOGNL;
 440         LOGFLUSH;
 441
 442         /* The stack is always merged. If there are returnAddresses on
 443          * the stack they are ignored in this step. */
 444
 445         changed |= typestack_merge(deststack,ystack);
 446
 447         if (!jsrencountered)
 448                 return typevector_merge(destloc,yloc,locsize);
 449
 450         for (yvec=yloc; yvec; yvec=yvec->alt) {
 451                 ky = yvec->k;
 452
 453                 /* Check if the typestates (deststack,destloc) will be
 454                  * separable when (ystack,yvec) is added. */
 455
 456                 if (!typestack_separable_with(deststack,ystack,ky)
 457                         && !typevectorset_separable_with(destloc,yvec,locsize))
 458                 {
 459                         /* No, the resulting set won't be separable, thus we
 460                          * may merge all states in (deststack,destloc) and
 461                          * (ystack,yvec). */
 462
 463                         typestack_collapse(deststack);
 464                         typevectorset_collapse(destloc,locsize);
 465                         typevector_merge(destloc,yvec,locsize);
 466                 }
 467                 else {
 468                         /* Yes, the resulting set will be separable. Thus we check
 469                          * if we may merge (ystack,yvec) with a single state in
 470                          * (deststack,destloc). */
 471
 472                         for (dvec=destloc,kd=0; dvec; dvec=dvec->alt, kd++) {
 473                                 if (!typestack_separable_from(ystack,ky,deststack,kd)
 474                                         && !typevector_separable_from(yvec,dvec,locsize))
 475                                 {
 476                                         /* The typestate (ystack,yvec) is not separable from
 477                                          * (deststack,dvec) by any returnAddress. Thus we may
 478                                          * merge the states. */
 479
 480                                         changed |= typevector_merge(dvec,yvec,locsize);
 481
 482                                         goto merged;
 483                                 }
 484                         }
 485
 486                         /* The typestate (ystack,yvec) is separable from all typestates
 487                          * (deststack,destloc). Thus we must add this state to the
 488                          * result set. */
 489
 490                         typestack_add(deststack,ystack,ky);
 491                         typevectorset_add(destloc,yvec,locsize);
 492                         changed = true;
 493                 }
 494
 495         merged:
 496                 ;
 497         }
 498
 499         LOG("result:");
 500         LOGSTR("dstack: "); DOLOG(typestack_print(get_logfile(),deststack)); LOGNL;
 501         LOGSTR("dloc  : "); DOLOG(typevectorset_print(get_logfile(),destloc,locsize)); LOGNL;
 502         LOGFLUSH;
 503
 504         return changed;
 505 }
 506
 507
 508 static bool
 509 typestate_reach(codegendata *cd, registerdata *rd,void *localbuf,
 510                                 basicblock *current,
 511                                 basicblock *destblock,
 512                                 stackptr ystack,typevector *yloc,
 513                                 int locsize,bool jsrencountered)
 514 {
 515         typevector *destloc;
 516         int destidx;
 517         bool changed = false;
 518
 519         LOG1("reaching block L%03d",destblock->debug_nr);
 520         TYPECHECK_COUNT(stat_reached);
 521
 522         destidx = destblock - cd->method->basicblocks;
 523         destloc = MGET_TYPEVECTOR(localbuf,destidx,locsize);
 524
 525         /* When branching backwards we have to check for uninitialized objects */
 526
 527         if (destblock <= current) {
 528                 stackptr sp;
 529                 int i;
 530 #if defined(__GNUC__)
 531 #warning FIXME FOR INLINING
 532 #endif
 533                 if (!useinlining) {
 534                         TYPECHECK_COUNT(stat_backwards);
 535                         LOG("BACKWARDS!");
 536                         for (sp = ystack; sp; sp=sp->prev)
 537                                 if (sp->type == TYPE_ADR &&
 538                                 TYPEINFO_IS_NEWOBJECT(sp->typeinfo)) {
 539                                         show_icmd_method(cd->method,cd,rd);
 540                                         printf("current: %d, dest: %d\n", current->debug_nr, destblock->debug_nr);
 541                                         panic("Branching backwards with uninitialized object on stack");
 542                         }
 543
 544                         for (i=0; i<locsize; ++i)
 545                                 if (yloc->td[i].type == TYPE_ADR &&
 546                                 TYPEINFO_IS_NEWOBJECT(yloc->td[i].info))
 547                                         panic("Branching backwards with uninitialized object in local variable");
 548                 }
 549         }
 550
 551         if (destblock->flags == BBTYPECHECK_UNDEF) {
 552                 /* The destblock has never been reached before */
 553
 554                 TYPECHECK_COUNT(stat_copied);
 555                 LOG1("block (index %04d) reached first time",destidx);
 556
 557                 typestack_copy(destblock->instack,ystack,yloc);
 558                 COPY_TYPEVECTORSET(yloc,destloc,locsize);
 559                 changed = true;
 560         }
 561         else {
 562                 /* The destblock has already been reached before */
 563
 564                 TYPECHECK_COUNT(stat_merged);
 565                 LOG1("block (index %04d) reached before",destidx);
 566
 567                 changed = typestate_merge(destblock->instack,destloc,
 568                                                                   ystack,yloc,locsize,
 569                                                                   jsrencountered);
 570                 TYPECHECK_COUNTIF(changed,stat_merging_changed);
 571         }
 572
 573         if (changed) {
 574                 LOG("changed!");
 575                 destblock->flags = BBTYPECHECK_REACHED;
 576                 if (destblock <= current) {LOG("REPEAT!"); return true;}
 577         }
 578         return false;
 579 }
 580
 581
 582 static bool
 583 typestate_ret(codegendata *cd,registerdata *rd, void *localbuf,
 584                           basicblock *current,
 585                           stackptr ystack,typevector *yloc,
 586                           int retindex,int locsize)
 587 {
 588         typevector *yvec;
 589         typevector *selected;
 590         basicblock *destblock;
 591         bool repeat = false;
 592
 593         for (yvec=yloc; yvec; ) {
 594                 if (!TYPEDESC_IS_RETURNADDRESS(yvec->td[retindex]))
 595                         panic("Illegal instruction: RET on non-returnAddress");
 596
 597                 destblock = (basicblock*) TYPEINFO_RETURNADDRESS(yvec->td[retindex].info);
 598
 599                 selected = typevectorset_select(&yvec,retindex,destblock);
 600
 601                 repeat |= typestate_reach(cd, rd,  localbuf,current,destblock,
 602                                                                   ystack,selected,locsize,true);
 603         }
 604         return repeat;
 605 }
 606
 607 /****************************************************************************/
 608 /* HELPER FUNCTIONS                                                         */
 609 /****************************************************************************/
 610
 611 /* If a field is checked, definingclass == implementingclass */
 612 static bool
 613 is_accessible(int flags,classinfo *definingclass,classinfo *implementingclass, classinfo *methodclass,
 614                           typeinfo *instance)
 615 {
 616         /* check access rights */
 617         if (methodclass != definingclass) {
 618                 switch (flags & (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED)) {
 619                   case ACC_PUBLIC:
 620                           break;
 621
 622                           /* In the cases below, definingclass cannot be an interface */
 623
 624                   case 0:
 625                           if (definingclass->packagename != methodclass->packagename)
 626                                   return false;
 627                           break;
 628                   case ACC_PROTECTED:
 629                           if (definingclass->packagename != methodclass->packagename) {
 630                                   if (!builtin_isanysubclass(methodclass,implementingclass))
 631                                           return false;
 632
 633                                   /* For protected access of super class members in another
 634                                    * package the instance must be a subclass of or the same
 635                                    * as the current class. */
 636                                   LOG("protected access into other package");
 637                                   implementingclass = 0; /*dont't fail, don't really get it (was: methodclass)
 638                                         This code was never triggered before, since all packagenames had been 0-pointers
 639                                         anybody an idea ?*/
 640                           }
 641                           break;
 642                   case ACC_PRIVATE:
 643                           if (definingclass != methodclass) {
 644                                   LOG("private access");
 645                                   return false;
 646                           }
 647                           break;
 648                   default:
 649                           panic("Invalid access flags");
 650                 }
 651         }
 652
 653         if (instance) {
 654                 if ((flags & ACC_STATIC) != 0) {
 655                         LOG("accessing STATIC member with instance");
 656                         return false;
 657                 }
 658
 659                 if (implementingclass
 660                         && !TYPEINFO_IS_NULLTYPE(*instance)
 661                         && !TYPEINFO_IS_NEWOBJECT(*instance))
 662                 {
 663                         if (!typeinfo_is_assignable_to_classinfo(instance,
 664                                                                                                          implementingclass))
 665                         {
 666                                 LOG("instance not assignable");
 667                                 LOGINFO(instance);
 668                                 LOGSTRu(implementingclass->name); LOGNL; LOGFLUSH;
 669                                 return false;
 670                         }
 671                 }
 672         }
 673         else {
 674                 if ((flags & ACC_STATIC) == 0) {
 675                         LOG("accessing non-STATIC member without instance");
 676                         return false;
 677                 }
 678         }
 679
 680         return true;
 681 }
 682
 683 /****************************************************************************/
 684 /* MACROS FOR LOCAL VARIABLE CHECKING                                       */
 685 /****************************************************************************/
 686
 687 #define INDEX_ONEWORD(num)                                                                              \
 688         do { if((num)<0 || (num)>=validlocals)                                          \
 689                         panic("Invalid local variable index"); } while (0)
 690 #define INDEX_TWOWORD(num)                                                                              \
 691         do { if((num)<0 || ((num)+1)>=validlocals)                                      \
 692                         panic("Invalid local variable index"); } while (0)
 693
 694 #define STORE_ONEWORD(num,type)                                                                 \
 695         do {typevectorset_store(localset,num,type,NULL);} while(0)
 696
 697 #define STORE_TWOWORD(num,type)                                                                         \
 698         do {typevectorset_store_twoword(localset,num,type);} while(0)
 699
 700
 701 #define WORDCHECKFAULT \
 702         do { \
 703                 show_icmd_method(m, cd, rd); \
 704                 dolog("localset->td index: %ld\ninstruction belongs to:%s.%s, outermethod:%s.%s\n", \
 705                 iptr->op1,iptr->method->class->name->text, \
 706                         iptr->method->name->text,m->class->name->text,m->name->text); \
 707                 show_icmd(iptr++, false); \
 708                 show_icmd(iptr, false); \
 709         } while (0)
 710
 711
 712 #define CHECK_ONEWORD(num,tp)                                                                                   \
 713         do {TYPECHECK_COUNT(stat_ins_primload);                                                         \
 714                 if (jsrencountered) {                                                                                   \
 715                         if (!typevectorset_checktype(localset,num,tp)) {                                \
 716                                 WORDCHECKFAULT; \
 717                                 panic("Variable type mismatch");                                                \
 718                         }       \
 719                 }                                                                                                                               \
 720                 else {                                                                                                                  \
 721                         if (localset->td[num].type != tp) {                                                     \
 722                                 panic("Variable type mismatch");                                                \
 723                                 WORDCHECKFAULT; \
 724                         } \
 725                 }                                                                                                                               \
 726                 } while(0)
 727
 728 #define CHECK_TWOWORD(num,type)                                                                                 \
 729         do {TYPECHECK_COUNT(stat_ins_primload);                                                         \
 730                 if (!typevectorset_checktype(localset,num,type)) {                \
 731                         WORDCHECKFAULT; \
 732                         panic("Variable type mismatch");                                \
 733                 } \
 734         } while(0)
 735
 736 /****************************************************************************/
 737 /* MACROS FOR STACK TYPE CHECKING                                           */
 738 /****************************************************************************/
 739
 740 /* These macros are for basic typechecks which were not done in stack.c */
 741
 742 #define TYPECHECK_STACK(sp,tp)                                                          \
 743         do { if ((sp)->type != (tp))                                                    \
 744                         panic("Wrong data type on stack"); } while(0)
 745
 746 #define TYPECHECK_ADR(sp)  TYPECHECK_STACK(sp,TYPE_ADR)
 747 #define TYPECHECK_INT(sp)  TYPECHECK_STACK(sp,TYPE_INT)
 748 #define TYPECHECK_LNG(sp)  TYPECHECK_STACK(sp,TYPE_LNG)
 749 #define TYPECHECK_FLT(sp)  TYPECHECK_STACK(sp,TYPE_FLT)
 750 #define TYPECHECK_DBL(sp)  TYPECHECK_STACK(sp,TYPE_DBL)
 751
 752 #define TYPECHECK_ARGS1(t1)                                                                 \
 753         do {TYPECHECK_STACK(curstack,t1);} while (0)
 754 #define TYPECHECK_ARGS2(t1,t2)                                                      \
 755         do {TYPECHECK_ARGS1(t1);                                                                        \
 756                 TYPECHECK_STACK(curstack->prev,t2);} while (0)
 757 #define TYPECHECK_ARGS3(t1,t2,t3)                                                               \
 758         do {TYPECHECK_ARGS2(t1,t2);                                                                     \
 759                 TYPECHECK_STACK(curstack->prev->prev,t3);} while (0)
 760
 761 /****************************************************************************/
 762 /* MISC MACROS                                                              */
 763 /****************************************************************************/
 764
 765 #define COPYTYPE(source,dest)   \
 766         {if ((source)->type == TYPE_ADR)                                                                \
 767                         TYPEINFO_COPY((source)->typeinfo,(dest)->typeinfo);}
 768
 769 #define ISBUILTIN(v)   (iptr->val.fp == (functionptr) (v))
 770
 771 /* TYPECHECK_REACH: executed, when the target block (tbptr) can be reached
 772  *     from the current block (bptr). The types of local variables and
 773  *     stack slots are propagated to the target block.
 774  * Input:
 775  *     bptr.......current block
 776  *     tbptr......target block
 777  *     dst........current output stack pointer
 778  *     numlocals..number of local variables
 779  *     localset...current local variable vectorset
 780  *     localbuf...local variable vectorset buffer
 781  *     jsrencountered...true if a JSR has been seen
 782  * Output:
 783  *     repeat.....changed to true if a block before the current
 784  *                block has changed
 785  */
 786 #define TYPECHECK_REACH                                                 \
 787     do {                                                                \
 788     repeat |= typestate_reach(cd,rd, localbuf,bptr,tbptr,dst,               \
 789                                                           localset,numlocals,jsrencountered);       \
 790     LOG("done.");                                                       \
 791     } while (0)
 792
 793 /* TYPECHECK_LEAVE: executed when the method is exited non-abruptly
 794  * Input:
 795  *     class........class of the current method
 796  *     numlocals....number of local variables
 797  *     localset.....current local variable vectorset
 798  *     initmethod...true if this is an <init> method
 799  */
 800 #define TYPECHECK_LEAVE                                                 \
 801     do {                                                                \
 802         if (initmethod && m->class != class_java_lang_Object) {         \
 803             /* check the marker variable */                             \
 804             LOG("Checking <init> marker");                              \
 805             if (!typevectorset_checktype(localset,numlocals-1,TYPE_INT))\
 806                 panic("<init> method does not initialize 'this'");      \
 807         }                                                               \
 808     } while (0)
 809
 810 /****************************************************************************/
 811 /* typecheck()                                                              */
 812 /****************************************************************************/
 813
 814 #define MAXPARAMS 255
 815
 816 /* typecheck is called directly after analyse_stack */
 817
 818 methodinfo *typecheck(methodinfo *m, codegendata *cd, registerdata *rd)
 819 {
 820     int b_count, b_index;
 821     stackptr curstack;      /* input stack top for current instruction */
 822     stackptr srcstack;         /* source stack for copying and merging */
 823     int opcode;                                      /* current opcode */
 824     int i;                                        /* temporary counter */
 825     int len;                        /* for counting instructions, etc. */
 826     bool superblockend;        /* true if no fallthrough to next block */
 827     bool repeat;            /* if true, blocks are iterated over again */
 828     instruction *iptr;               /* pointer to current instruction */
 829     basicblock *bptr;                /* pointer to current basic block */
 830     basicblock *tbptr;                   /* temporary for target block */
 831
 832     int numlocals;                        /* number of local variables */
 833         int validlocals;         /* number of valid local variable indices */
 834         void *localbuf;       /* local variable types for each block start */
 835         typevector *localset;        /* typevector set for local variables */
 836         typevector *lset;                             /* temporary pointer */
 837         typedescriptor *td;                           /* temporary pointer */
 838
 839         stackptr savedstackbuf = NULL;      /* buffer for saving the stack */
 840         stackptr savedstack = NULL;      /* saved instack of current block */
 841
 842         stackelement excstack;           /* instack for exception handlers */
 843
 844         typedescriptor returntype;        /* return type of current method */
 845     u1 *ptype;                     /* parameter types of called method */
 846     typeinfo *pinfo;           /* parameter typeinfos of called method */
 847     int rtype;                         /* return type of called method */
 848     typeinfo rinfo;       /* typeinfo for return type of called method */
 849
 850     stackptr dst;               /* output stack of current instruction */
 851     basicblock **tptr;    /* pointer into target list of switch instr. */
 852     exceptiontable **handlers;            /* active exception handlers */
 853     classinfo *cls;                                       /* temporary */
 854     bool maythrow;               /* true if this instruction may throw */
 855     static utf *name_init;                                 /* "<init>" */
 856     bool initmethod;             /* true if this is an "<init>" method */
 857         builtin_descriptor *builtindesc;    /* temp. descriptor of builtin */
 858         bool jsrencountered = false;         /* true if we there was a JSR */
 859
 860     classinfo *myclass;
 861
 862 #ifdef TYPECHECK_STATISTICS
 863         int count_iterations = 0;
 864         TYPECHECK_COUNT(stat_typechecked);
 865         TYPECHECK_COUNT_FREQ(stat_locals,cd->maxlocals,STAT_LOCALS);
 866         TYPECHECK_COUNT_FREQ(stat_blocks,m->basicblockcount/10,STAT_BLOCKS);
 867 #endif
 868
 869     LOGSTR("\n==============================================================================\n");
 870     /*DOLOG( show_icmd_method(cd->method,cd,rd));*/
 871     LOGSTR("\n==============================================================================\n");
 872     LOGimpSTR("Entering typecheck: ");
 873     LOGimpSTRu(cd->method->name);
 874     LOGimpSTR("    ");
 875     LOGimpSTRu(cd->method->descriptor);
 876     LOGimpSTR("    (class ");
 877     LOGimpSTRu(cd->method->class->name);
 878     LOGimpSTR(")\n");
 879         LOGFLUSH;
 880
 881         if (!name_init)
 882                 name_init = utf_new_char("<init>");
 883     initmethod = (m->name == name_init);
 884
 885         /* Allocate buffer for method arguments */
 886
 887     ptype = DMNEW(u1,MAXPARAMS);
 888     pinfo = DMNEW(typeinfo,MAXPARAMS);
 889
 890     LOG("Buffer allocated.\n");
 891
 892     /* reset all BBFINISHED blocks to BBTYPECHECK_UNDEF. */
 893     b_count = m->basicblockcount;
 894     bptr = m->basicblocks;
 895     while (--b_count >= 0) {
 896 #ifdef TYPECHECK_DEBUG
 897         if (bptr->flags != BBFINISHED && bptr->flags != BBDELETED
 898             && bptr->flags != BBUNDEF)
 899         {
 900             /*show_icmd_method(cd->method,cd,rd);*/
 901             LOGSTR1("block flags: %d\n",bptr->flags); LOGFLUSH;
 902             panic("Internal error: Unexpected block flags in typecheck()");
 903         }
 904 #endif
 905         if (bptr->flags >= BBFINISHED) {
 906             bptr->flags = BBTYPECHECK_UNDEF;
 907         }
 908         bptr++;
 909     }
 910
 911     /* The first block is always reached */
 912     if (m->basicblockcount && m->basicblocks[0].flags == BBTYPECHECK_UNDEF)
 913         m->basicblocks[0].flags = BBTYPECHECK_REACHED;
 914
 915     LOG("Blocks reset.\n");
 916
 917     /* number of local variables */
 918
 919     /* In <init> methods we use an extra local variable to signal if
 920      * the 'this' reference has been initialized. */
 921     numlocals = cd->maxlocals;
 922         validlocals = numlocals;
 923     if (initmethod) numlocals++;
 924
 925     /* allocate the buffers for local variables */
 926         localbuf = DMNEW_TYPEVECTOR(m->basicblockcount+1, numlocals);
 927         localset = MGET_TYPEVECTOR(localbuf,m->basicblockcount,numlocals);
 928
 929     LOG("Variable buffer allocated.\n");
 930
 931     /* allocate the buffer of active exception handlers */
 932     handlers = DMNEW(exceptiontable*, cd->exceptiontablelength + 1);
 933
 934     /* initialize the variable types of the first block */
 935     /* to the types of the arguments */
 936         lset = MGET_TYPEVECTOR(localbuf,0,numlocals);
 937         lset->k = 0;
 938         lset->alt = NULL;
 939         td = lset->td;
 940         i = validlocals;
 941
 942     /* if this is an instance method initialize the "this" ref type */
 943     if (!(m->flags & ACC_STATIC)) {
 944                 if (!i)
 945                         panic("Not enough local variables for method arguments");
 946         td->type = TYPE_ADDRESS;
 947         if (initmethod)
 948             TYPEINFO_INIT_NEWOBJECT(td->info,NULL);
 949         else
 950             TYPEINFO_INIT_CLASSINFO(td->info, m->class);
 951         td++;
 952                 i--;
 953     }
 954
 955     LOG("'this' argument set.\n");
 956
 957     /* the rest of the arguments and the return type */
 958     i = typedescriptors_init_from_method_args(td, m->descriptor,
 959                                                                                           i,
 960                                                                                           true, /* two word types use two slots */
 961                                                                                           &returntype);
 962         td += i;
 963         i = numlocals - (td - lset->td);
 964         while (i--) {
 965                 td->type = TYPE_VOID;
 966                 td++;
 967         }
 968
 969     LOG("Arguments set.\n");
 970
 971     /* initialize the input stack of exception handlers */
 972         excstack.prev = NULL;
 973         excstack.type = TYPE_ADR;
 974         TYPEINFO_INIT_CLASSINFO(excstack.typeinfo,
 975                                                         class_java_lang_Throwable); /* changed later */
 976
 977     LOG("Exception handler stacks set.\n");
 978
 979     /* loop while there are still blocks to be checked */
 980     do {
 981                 TYPECHECK_COUNT(count_iterations);
 982
 983         repeat = false;
 984
 985         b_count = m->basicblockcount;
 986         bptr = m->basicblocks;
 987
 988         while (--b_count >= 0) {
 989             LOGSTR1("---- BLOCK %04d, ",bptr->debug_nr);
 990             LOGSTR1("blockflags: %d\n",bptr->flags);
 991             LOGFLUSH;
 992
 993             if (bptr->flags == BBTYPECHECK_REACHED) {
 994                 LOGSTR1("\n---- BLOCK %04d ------------------------------------------------\n",bptr->debug_nr);
 995                 LOGFLUSH;
 996
 997                 superblockend = false;
 998                 bptr->flags = BBFINISHED;
 999                 b_index = bptr - m->basicblocks;
1000
1001                 /* init stack at the start of this block */
1002                 curstack = bptr->instack;
1003
1004                 /* determine the active exception handlers for this block */
1005                 /* XXX could use a faster algorithm with sorted lists or
1006                  * something? */
1007                 len = 0;
1008                 for (i = 0; i < cd->exceptiontablelength; ++i) {
1009                     if ((cd->exceptiontable[i].start <= bptr) && (cd->exceptiontable[i].end > bptr)) {
1010                         LOG1("active handler L%03d", cd->exceptiontable[i].handler->debug_nr);
1011                         handlers[len++] = cd->exceptiontable + i;
1012                     }
1013                 }
1014                 handlers[len] = NULL;
1015
1016                 /* init variable types at the start of this block */
1017                                 COPY_TYPEVECTORSET(MGET_TYPEVECTOR(localbuf,b_index,numlocals),
1018                                                                    localset,numlocals);
1019 #if defined(__GNUC__)
1020 #warning FIXME FOR INLINING
1021 #endif
1022                 if(!useinlining) {
1023                                 if (handlers[0])
1024                                         for (i=0; i<numlocals; ++i)
1025                                                 if (localset->td[i].type == TYPE_ADR
1026                                                         && TYPEINFO_IS_NEWOBJECT(localset->td[i].info)) {
1027                                                                 show_icmd_method(m, cd, rd);
1028                                                                 printf("Uninitialized variale: %d, block: %d\n", i, bptr->debug_nr);
1029                                                                 panic("Uninitialized object in local variable inside try block");
1030                                                         }
1031                 }
1032                                 DOLOG(typestate_print(get_logfile(),curstack,localset,numlocals));
1033                                 LOGNL; LOGFLUSH;
1034
1035                 /* loop over the instructions */
1036                 len = bptr->icount;
1037                 iptr = bptr->iinstr;
1038                 while (--len >= 0)  {
1039                                         TYPECHECK_COUNT(stat_ins);
1040                     DOLOG(show_icmd(iptr,false)); LOGNL; LOGFLUSH;
1041
1042                     opcode = iptr->opc;
1043                     myclass = iptr->method->class;
1044                     dst = iptr->dst;
1045                     maythrow = false;
1046
1047                     switch (opcode) {
1048
1049                         /****************************************/
1050                         /* STACK MANIPULATIONS                  */
1051
1052                         /* We just need to copy the typeinfo */
1053                         /* for slots containing addresses.   */
1054
1055                         /* XXX We assume that the destination stack
1056                          * slots were continuously allocated in
1057                          * memory.  (The current implementation in
1058                          * stack.c)
1059                          */
1060
1061                       case ICMD_DUP:
1062                           COPYTYPE(curstack,dst);
1063                           break;
1064
1065                       case ICMD_DUP_X1:
1066                           COPYTYPE(curstack,dst);
1067                           COPYTYPE(curstack,dst-2);
1068                           COPYTYPE(curstack->prev,dst-1);
1069                           break;
1070
1071                       case ICMD_DUP_X2:
1072                           COPYTYPE(curstack,dst);
1073                           COPYTYPE(curstack,dst-3);
1074                           COPYTYPE(curstack->prev,dst-1);
1075                           COPYTYPE(curstack->prev->prev,dst-2);
1076                           break;
1077
1078                       case ICMD_DUP2:
1079                           COPYTYPE(curstack,dst);
1080                           COPYTYPE(curstack->prev,dst-1);
1081                           break;
1082
1083                       case ICMD_DUP2_X1:
1084                           COPYTYPE(curstack,dst);
1085                           COPYTYPE(curstack->prev,dst-1);
1086                           COPYTYPE(curstack,dst-3);
1087                           COPYTYPE(curstack->prev,dst-4);
1088                           COPYTYPE(curstack->prev->prev,dst-2);
1089                           break;
1090
1091                       case ICMD_DUP2_X2:
1092                           COPYTYPE(curstack,dst);
1093                           COPYTYPE(curstack->prev,dst-1);
1094                           COPYTYPE(curstack,dst-4);
1095                           COPYTYPE(curstack->prev,dst-5);
1096                           COPYTYPE(curstack->prev->prev,dst-2);
1097                           COPYTYPE(curstack->prev->prev->prev,dst-3);
1098                           break;
1099
1100                       case ICMD_SWAP:
1101                           COPYTYPE(curstack,dst-1);
1102                           COPYTYPE(curstack->prev,dst);
1103                           break;
1104
1105                           /****************************************/
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115                           /* PRIMITIVE VARIABLE ACCESS            */
1116
1117                       case ICMD_ILOAD: CHECK_ONEWORD(iptr->op1,TYPE_INT); break;
1118                       case ICMD_FLOAD: CHECK_ONEWORD(iptr->op1,TYPE_FLOAT); break;
1119                       case ICMD_IINC:  CHECK_ONEWORD(iptr->op1,TYPE_INT); break;
1120                       case ICMD_LLOAD: CHECK_TWOWORD(iptr->op1,TYPE_LONG); break;
1121                       case ICMD_DLOAD: CHECK_TWOWORD(iptr->op1,TYPE_DOUBLE); break;
1122
1123                       case ICMD_FSTORE: STORE_ONEWORD(iptr->op1,TYPE_FLOAT); break;
1124                       case ICMD_ISTORE: STORE_ONEWORD(iptr->op1,TYPE_INT); break;
1125                       case ICMD_LSTORE: STORE_TWOWORD(iptr->op1,TYPE_LONG); break;
1126                       case ICMD_DSTORE: STORE_TWOWORD(iptr->op1,TYPE_DOUBLE); break;
1127
1128                           /****************************************/
1129                           /* LOADING ADDRESS FROM VARIABLE        */
1130
1131                       case ICMD_ALOAD:
1132                                                   TYPECHECK_COUNT(stat_ins_aload);
1133
1134                           /* loading a returnAddress is not allowed */
1135                                                   if (jsrencountered) {
1136                                                           if (!typevectorset_checkreference(localset,iptr->op1))
1137                                                                   panic("illegal instruction: ALOAD loading non-reference");
1138
1139                                                           typevectorset_copymergedtype(localset,iptr->op1,&(dst->typeinfo));
1140                                                   }
1141                                                   else {
1142                                                           if (!TYPEDESC_IS_REFERENCE(localset->td[iptr->op1])) {
1143                                                                   show_icmd_method(m, cd, rd);
1144                                                                   dolog("localset->td index: %ld\ninstruction belongs to:%s.%s, outermethod:%s.%s\n",
1145                                                                         iptr->op1,iptr->method->class->name->text,
1146                                                                         iptr->method->name->text,m->class->name->text,m->name->text);
1147                                                                   show_icmd(iptr, false);
1148                                                                   panic("illegal instruction: ALOAD loading non-reference");
1149                                                           }
1150                                                           TYPEINFO_COPY(localset->td[iptr->op1].info,dst->typeinfo);
1151                                                   }
1152                           break;
1153
1154                           /****************************************/
1155                           /* STORING ADDRESS TO VARIABLE          */
1156
1157                       case ICMD_ASTORE:
1158                           if (handlers[0] &&
1159                               TYPEINFO_IS_NEWOBJECT(curstack->typeinfo))
1160                               panic("Storing uninitialized object in local variable inside try block");
1161
1162                                                   if (TYPESTACK_IS_RETURNADDRESS(curstack))
1163                                                           typevectorset_store_retaddr(localset,iptr->op1,&(curstack->typeinfo));
1164                                                   else
1165                                                           typevectorset_store(localset,iptr->op1,TYPE_ADDRESS,
1166                                                                                                   &(curstack->typeinfo));
1167                           break;
1168
1169                           /****************************************/
1170                           /* LOADING ADDRESS FROM ARRAY           */
1171
1172                       case ICMD_AALOAD:
1173                           if (!TYPEINFO_MAYBE_ARRAY_OF_REFS(curstack->prev->typeinfo))
1174                               panic("illegal instruction: AALOAD on non-reference array");
1175
1176                           typeinfo_init_component(&curstack->prev->typeinfo,&dst->typeinfo);
1177                           maythrow = true;
1178                           break;
1179
1180                           /****************************************/
1181                           /* FIELD ACCESS                         */
1182
1183                       case ICMD_PUTFIELD:
1184                                                   TYPECHECK_COUNT(stat_ins_field);
1185                           if (!TYPEINFO_IS_REFERENCE(curstack->prev->typeinfo))
1186                               panic("illegal instruction: PUTFIELD on non-reference");
1187                           if (TYPEINFO_IS_ARRAY(curstack->prev->typeinfo))
1188                               panic("illegal instruction: PUTFIELD on array");
1189
1190                           /* check if the value is assignable to the field */
1191                                                   {
1192                                                           fieldinfo *fi = (fieldinfo*) iptr[0].val.a;
1193
1194                                                           if (TYPEINFO_IS_NEWOBJECT(curstack->prev->typeinfo)) {
1195                                                                   if (initmethod
1196                                                                           && !TYPEINFO_NEWOBJECT_INSTRUCTION(curstack->prev->typeinfo))
1197                                                                   {
1198                                                                           /* uninitialized "this" instance */
1199                                                                           if (fi->class != m->class || (fi->flags & ACC_STATIC) != 0)
1200                                                                                   panic("Setting unaccessible field in uninitialized object");
1201                                                                   }
1202                                                                   else {
1203                                                                           panic("PUTFIELD on uninitialized object");
1204                                                                   }
1205                                                           }
1206                                                           else {
1207                                                                   if (!is_accessible(fi->flags,fi->class,fi->class, myclass,
1208                                                                                                          &(curstack->prev->typeinfo)))
1209                                                                           panic("PUTFIELD: field is not accessible");
1210                                                           }
1211
1212                                                           if (curstack->type != fi->type)
1213                                                                   panic("PUTFIELD type mismatch");
1214                                                           if (fi->type == TYPE_ADR) {
1215                                                                   TYPEINFO_INIT_FROM_FIELDINFO(rinfo,fi);
1216                                                                   if (!typeinfo_is_assignable(&(curstack->typeinfo),
1217                                                                                                                           &rinfo))
1218                                                                           panic("PUTFIELD reference type not assignable");
1219                                                           }
1220                                                   }
1221                           maythrow = true;
1222                           break;
1223
1224                       case ICMD_PUTSTATIC:
1225                                                   TYPECHECK_COUNT(stat_ins_field);
1226                           /* check if the value is assignable to the field */
1227                                                   {
1228                                                           fieldinfo *fi = (fieldinfo*) iptr[0].val.a;
1229
1230                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,NULL))
1231                                                                   panic("PUTSTATIC: field is not accessible");
1232
1233                                                           if (curstack->type != fi->type)
1234                                                                   panic("PUTSTATIC type mismatch");
1235                                                           if (fi->type == TYPE_ADR) {
1236                                                                   TYPEINFO_INIT_FROM_FIELDINFO(rinfo,fi);
1237                                                                   if (!typeinfo_is_assignable(&(curstack->typeinfo),
1238                                                                                                                           &rinfo))
1239                                                                           panic("PUTSTATIC reference type not assignable");
1240                                                           }
1241                                                   }
1242                           maythrow = true;
1243                           break;
1244
1245                       case ICMD_GETFIELD:
1246                                                   TYPECHECK_COUNT(stat_ins_field);
1247                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1248                               panic("illegal instruction: GETFIELD on non-reference");
1249                           if (TYPEINFO_IS_ARRAY(curstack->typeinfo))
1250                               panic("illegal instruction: GETFIELD on array");
1251
1252                           {
1253                               fieldinfo *fi = (fieldinfo *)(iptr->val.a);
1254
1255                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,
1256                                                                                                  &(curstack->typeinfo)))
1257                                                                   panic("GETFIELD: field is not accessible");
1258
1259                               if (dst->type == TYPE_ADR) {
1260                                   TYPEINFO_INIT_FROM_FIELDINFO(dst->typeinfo,fi);
1261                               }
1262                           }
1263                           maythrow = true;
1264                           break;
1265
1266                       case ICMD_GETSTATIC:
1267                                                   TYPECHECK_COUNT(stat_ins_field);
1268                           {
1269                               fieldinfo *fi = (fieldinfo *)(iptr->val.a);
1270
1271                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,NULL)) {
1272                                                                 printf("---------\n");
1273                                                                   utf_display(fi->class->name);
1274                                                                 printf("\n");
1275                                                                   utf_display(myclass->name);
1276                                                                 printf("\n");
1277
1278
1279                                                                   panic("GETSTATIC: field is not accessible");
1280                                                         }
1281
1282                               if (dst->type == TYPE_ADR) {
1283                                   TYPEINFO_INIT_FROM_FIELDINFO(dst->typeinfo,fi);
1284                               }
1285                           }
1286                           maythrow = true;
1287                           break;
1288
1289                           /****************************************/
1290                           /* PRIMITIVE ARRAY ACCESS               */
1291
1292                       case ICMD_ARRAYLENGTH:
1293                           if (!TYPEINFO_MAYBE_ARRAY(curstack->typeinfo)
1294                                                           && curstack->typeinfo.typeclass != pseudo_class_Arraystub)
1295                               panic("illegal instruction: ARRAYLENGTH on non-array");
1296                           maythrow = true;
1297                           break;
1298
1299                       case ICMD_BALOAD:
1300                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_BOOLEAN)
1301                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_BYTE))
1302                               panic("Array type mismatch");
1303                           maythrow = true;
1304                           break;
1305                       case ICMD_CALOAD:
1306                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_CHAR))
1307                               panic("Array type mismatch");
1308                           maythrow = true;
1309                           break;
1310                       case ICMD_DALOAD:
1311                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_DOUBLE))
1312                               panic("Array type mismatch");
1313                           maythrow = true;
1314                           break;
1315                       case ICMD_FALOAD:
1316                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_FLOAT))
1317                               panic("Array type mismatch");
1318                           maythrow = true;
1319                           break;
1320                       case ICMD_IALOAD:
1321                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_INT))
1322                               panic("Array type mismatch");
1323                           maythrow = true;
1324                           break;
1325                       case ICMD_SALOAD:
1326                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_SHORT))
1327                               panic("Array type mismatch");
1328                           maythrow = true;
1329                           break;
1330                       case ICMD_LALOAD:
1331                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_LONG))
1332                               panic("Array type mismatch");
1333                           maythrow = true;
1334                           break;
1335
1336                       case ICMD_BASTORE:
1337                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_BOOLEAN)
1338                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_BYTE))
1339                               panic("Array type mismatch");
1340                           maythrow = true;
1341                           break;
1342                       case ICMD_CASTORE:
1343                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_CHAR))
1344                               panic("Array type mismatch");
1345                           maythrow = true;
1346                           break;
1347                       case ICMD_DASTORE:
1348                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_DOUBLE))
1349                               panic("Array type mismatch");
1350                           maythrow = true;
1351                           break;
1352                       case ICMD_FASTORE:
1353                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_FLOAT))
1354                               panic("Array type mismatch");
1355                           maythrow = true;
1356                           break;
1357                       case ICMD_IASTORE:
1358                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_INT))
1359                               panic("Array type mismatch");
1360                           maythrow = true;
1361                           break;
1362                       case ICMD_SASTORE:
1363                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_SHORT))
1364                               panic("Array type mismatch");
1365                           maythrow = true;
1366                           break;
1367                       case ICMD_LASTORE:
1368                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_LONG))
1369                               panic("Array type mismatch");
1370                           maythrow = true;
1371                           break;
1372
1373                       case ICMD_IASTORECONST:
1374                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_INT))
1375                               panic("Array type mismatch");
1376                           maythrow = true;
1377                           break;
1378
1379                       case ICMD_LASTORECONST:
1380                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_LONG))
1381                               panic("Array type mismatch");
1382                           maythrow = true;
1383                           break;
1384
1385                       case ICMD_BASTORECONST:
1386                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_BOOLEAN)
1387                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_BYTE))
1388                               panic("Array type mismatch");
1389                           maythrow = true;
1390                           break;
1391
1392                       case ICMD_CASTORECONST:
1393                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_CHAR))
1394                               panic("Array type mismatch");
1395                           maythrow = true;
1396                           break;
1397
1398                       case ICMD_SASTORECONST:
1399                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_SHORT))
1400                               panic("Array type mismatch");
1401                           maythrow = true;
1402                           break;
1403
1404
1405                           /****************************************/
1406                           /* ADDRESS CONSTANTS                    */
1407
1408                       case ICMD_ACONST:
1409                           if (iptr->val.a == NULL)
1410                               TYPEINFO_INIT_NULLTYPE(dst->typeinfo);
1411                           else
1412                               /* string constants (or constant for builtin function) */
1413                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,class_java_lang_String);
1414                           break;
1415
1416                           /****************************************/
1417                           /* CHECKCAST AND INSTANCEOF             */
1418
1419                       case ICMD_CHECKCAST:
1420                                                   TYPECHECK_ADR(curstack);
1421                           /* returnAddress is not allowed */
1422                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1423                               panic("Illegal instruction: CHECKCAST on non-reference");
1424
1425                           TYPEINFO_INIT_CLASSINFO(dst->typeinfo,(classinfo *)iptr[0].val.a);
1426                           maythrow = true;
1427                           break;
1428
1429                       case ICMD_INSTANCEOF:
1430                                                   TYPECHECK_ADR(curstack);
1431                           /* returnAddress is not allowed */
1432                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1433                               panic("Illegal instruction: INSTANCEOF on non-reference");
1434                           break;
1435
1436                           /****************************************/
1437                           /* BRANCH INSTRUCTIONS                  */
1438
1439                       case ICMD_GOTO:
1440                           superblockend = true;
1441                           /* FALLTHROUGH! */
1442                       case ICMD_IFNULL:
1443                       case ICMD_IFNONNULL:
1444                       case ICMD_IFEQ:
1445                       case ICMD_IFNE:
1446                       case ICMD_IFLT:
1447                       case ICMD_IFGE:
1448                       case ICMD_IFGT:
1449                       case ICMD_IFLE:
1450                       case ICMD_IF_ICMPEQ:
1451                       case ICMD_IF_ICMPNE:
1452                       case ICMD_IF_ICMPLT:
1453                       case ICMD_IF_ICMPGE:
1454                       case ICMD_IF_ICMPGT:
1455                       case ICMD_IF_ICMPLE:
1456                       case ICMD_IF_ACMPEQ:
1457                       case ICMD_IF_ACMPNE:
1458                       case ICMD_IF_LEQ:
1459                       case ICMD_IF_LNE:
1460                       case ICMD_IF_LLT:
1461                       case ICMD_IF_LGE:
1462                       case ICMD_IF_LGT:
1463                       case ICMD_IF_LLE:
1464                       case ICMD_IF_LCMPEQ:
1465                       case ICMD_IF_LCMPNE:
1466                       case ICMD_IF_LCMPLT:
1467                       case ICMD_IF_LCMPGE:
1468                       case ICMD_IF_LCMPGT:
1469                       case ICMD_IF_LCMPLE:
1470                                                   TYPECHECK_COUNT(stat_ins_branch);
1471                           tbptr = (basicblock *) iptr->target;
1472
1473                           /* propagate stack and variables to the target block */
1474                           TYPECHECK_REACH;
1475                           break;
1476
1477                           /****************************************/
1478                           /* SWITCHES                             */
1479
1480                       case ICMD_TABLESWITCH:
1481                                                   TYPECHECK_COUNT(stat_ins_switch);
1482                           {
1483                               s4 *s4ptr = iptr->val.a;
1484                               s4ptr++;              /* skip default */
1485                               i = *s4ptr++;         /* low */
1486                               i = *s4ptr++ - i + 2; /* +1 for default target */
1487                           }
1488                           goto switch_instruction_tail;
1489
1490                       case ICMD_LOOKUPSWITCH:
1491                                                   TYPECHECK_COUNT(stat_ins_switch);
1492                           {
1493                               s4 *s4ptr = iptr->val.a;
1494                               s4ptr++;              /* skip default */
1495                               i = *s4ptr++ + 1;     /* count +1 for default */
1496                           }
1497                     switch_instruction_tail:
1498                           tptr = (basicblock **)iptr->target;
1499
1500                           while (--i >= 0) {
1501                               tbptr = *tptr++;
1502                               LOG2("target %d is block %04d",(tptr-(basicblock **)iptr->target)-1,tbptr->debug_nr);
1503                               TYPECHECK_REACH;
1504                           }
1505                           LOG("switch done");
1506                           superblockend = true;
1507                           break;
1508
1509                           /****************************************/
1510                           /* RETURNS AND THROW                    */
1511
1512                       case ICMD_ATHROW:
1513                           if (!typeinfo_is_assignable_to_classinfo(
1514                                    &curstack->typeinfo,class_java_lang_Throwable))
1515                               panic("illegal instruction: ATHROW on non-Throwable");
1516                           superblockend = true;
1517                           maythrow = true;
1518                           break;
1519
1520                       case ICMD_ARETURN:
1521                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1522                               panic("illegal instruction: ARETURN on non-reference");
1523
1524                           if (returntype.type != TYPE_ADDRESS
1525                               || !typeinfo_is_assignable(&curstack->typeinfo,&(returntype.info)))
1526                               panic("Return type mismatch");
1527                                                   goto return_tail;
1528
1529                       case ICMD_IRETURN:
1530                           if (returntype.type != TYPE_INT) panic("Return type mismatch");
1531                                                   goto return_tail;
1532
1533                       case ICMD_LRETURN:
1534                           if (returntype.type != TYPE_LONG) panic("Return type mismatch");
1535                                                   goto return_tail;
1536
1537                       case ICMD_FRETURN:
1538                           if (returntype.type != TYPE_FLOAT) panic("Return type mismatch");
1539                                                   goto return_tail;
1540
1541                       case ICMD_DRETURN:
1542                           if (returntype.type != TYPE_DOUBLE) panic("Return type mismatch");
1543                                                   goto return_tail;
1544
1545                       case ICMD_RETURN:
1546                           if (returntype.type != TYPE_VOID) panic("Return type mismatch");
1547                                           return_tail:
1548                           TYPECHECK_LEAVE;
1549                           superblockend = true;
1550                           maythrow = true;
1551                           break;
1552
1553                           /****************************************/
1554                           /* SUBROUTINE INSTRUCTIONS              */
1555
1556                       case ICMD_JSR:
1557                           LOG("jsr");
1558                                                   jsrencountered = true;
1559
1560                           /* This is a dirty hack. It is needed
1561                            * because of the special handling of
1562                            * ICMD_JSR in stack.c
1563                            */
1564                           dst = (stackptr) iptr->val.a;
1565
1566                           tbptr = (basicblock *) iptr->target;
1567                                                   if (bptr + 1 == (m->basicblocks + m->basicblockcount + 1))
1568                                                           panic("Illegal instruction: JSR at end of bytecode");
1569                                                   typestack_put_retaddr(dst,bptr+1,localset);
1570                                                   repeat |= typestate_reach(cd, rd,localbuf,bptr,tbptr,dst,
1571                                                                                                         localset,numlocals,true);
1572
1573                                                   superblockend = true;
1574                           break;
1575
1576                       case ICMD_RET:
1577                           /* check returnAddress variable */
1578                                                   if (!typevectorset_checkretaddr(localset,iptr->op1))
1579                               panic("illegal instruction: RET using non-returnAddress variable");
1580
1581                                                   repeat |= typestate_ret(cd,rd, localbuf,bptr,curstack,
1582                                                                                                   localset,iptr->op1,numlocals);
1583
1584                           superblockend = true;
1585                           break;
1586
1587                           /****************************************/
1588                           /* INVOKATIONS                          */
1589
1590                       case ICMD_INVOKEVIRTUAL:
1591                       case ICMD_INVOKESPECIAL:
1592                       case ICMD_INVOKESTATIC:
1593                       case ICMD_INVOKEINTERFACE:
1594                                                   TYPECHECK_COUNT(stat_ins_invoke);
1595                           {
1596                               methodinfo *mi = (methodinfo*) iptr->val.a;
1597                                                           bool specialmethod = (mi->name->text[0] == '<');
1598                               bool callinginit = (opcode == ICMD_INVOKESPECIAL && mi->name == name_init);
1599                               instruction *ins;
1600                               classinfo *initclass;
1601
1602                                                           if (specialmethod && !callinginit)
1603                                                                   panic("Invalid invocation of special method");
1604
1605                                                           if (opcode == ICMD_INVOKESPECIAL) {
1606                                                                   /* XXX for INVOKESPECIAL: check if the invokation is done at all */
1607
1608                                                                   /* (If callinginit the class is checked later.) */
1609                                                                   if (!callinginit) {
1610                                                                           if (!builtin_isanysubclass(myclass,mi->class))
1611                                                                                   panic("Illegal instruction: INVOKESPECIAL calling non-superclass method");
1612                                                                   }
1613                                                           }
1614
1615                               /* fetch parameter types and return type */
1616                               i = 0;
1617                               if (opcode != ICMD_INVOKESTATIC) {
1618                                   ptype[0] = TYPE_ADR;
1619                                   TYPEINFO_INIT_CLASSINFO(pinfo[0],mi->class);
1620                                   i++;
1621                               }
1622                               typeinfo_init_from_method_args(mi->descriptor,ptype+i,pinfo+i,
1623                                                              MAXPARAMS-i,false,
1624                                                              &rtype,&rinfo);
1625
1626                               /* check parameter types */
1627                               srcstack = curstack;
1628                               i = mi->paramcount; /* number of parameters including 'this'*/
1629                               while (--i >= 0) {
1630                                   LOG1("param %d",i);
1631                                   if (srcstack->type != ptype[i])
1632                                       panic("Parameter type mismatch in method invocation");
1633                                   if (srcstack->type == TYPE_ADR) {
1634                                       LOGINFO(&(srcstack->typeinfo));
1635                                       LOGINFO(pinfo + i);
1636                                       if (i==0 && callinginit)
1637                                       {
1638                                           /* first argument to <init> method */
1639                                           if (!TYPEINFO_IS_NEWOBJECT(srcstack->typeinfo))
1640                                               panic("Calling <init> on initialized object");
1641
1642                                           /* get the address of the NEW instruction */
1643                                           LOGINFO(&(srcstack->typeinfo));
1644                                           ins = (instruction*)TYPEINFO_NEWOBJECT_INSTRUCTION(srcstack->typeinfo);
1645                                           initclass = (ins) ? (classinfo*)ins[-1].val.a : m->class;
1646                                           LOGSTR("class: "); LOGSTRu(initclass->name); LOGNL;
1647
1648                                                                                   /* check type */
1649                                                                                   /* (This is checked below.) */
1650 /*                                                                                TYPEINFO_INIT_CLASSINFO(tempinfo,initclass); */
1651 /*                                           if (!typeinfo_is_assignable(&tempinfo,pinfo+0)) */
1652 /*                                               panic("Parameter reference type mismatch in <init> invocation"); */
1653                                       }
1654                                       else {
1655                                           if (!typeinfo_is_assignable(&(srcstack->typeinfo),pinfo+i))
1656                                               panic("Parameter reference type mismatch in method invocation");
1657                                       }
1658                                   }
1659                                   LOG("ok");
1660
1661                                   if (i) srcstack = srcstack->prev;
1662                               }
1663
1664                                                           /* XXX We should resolve the method and pass its
1665                                                            * class as implementingclass to is_accessible. */
1666                                                           /* JOWENN: FIXME (and on other invokation places of is_accessible too) */
1667                                                           if (!is_accessible(mi->flags,mi->class,/*NULL have to check what here should really be*/ mi->class /*dont't crash right now*/, myclass,
1668                                                                                                  (opcode == ICMD_INVOKESTATIC) ? NULL
1669                                                                                                  : &(srcstack->typeinfo)))
1670                                                                   panic("Invoking unaccessible method");
1671
1672                                                           LOG("checking return type");
1673                               if (rtype != TYPE_VOID) {
1674                                   if (rtype != dst->type)
1675                                       panic("Return type mismatch in method invocation");
1676                                   TYPEINFO_COPY(rinfo,dst->typeinfo);
1677                               }
1678
1679                               if (callinginit) {
1680                                                                   LOG("replacing uninitialized object");
1681                                   /* replace uninitialized object type on stack */
1682                                   srcstack = dst;
1683                                   while (srcstack) {
1684                                       if (srcstack->type == TYPE_ADR
1685                                           && TYPEINFO_IS_NEWOBJECT(srcstack->typeinfo)
1686                                           && TYPEINFO_NEWOBJECT_INSTRUCTION(srcstack->typeinfo) == ins)
1687                                       {
1688                                           LOG("replacing uninitialized type on stack");
1689
1690                                                                                   /* If this stackslot is in the instack of
1691                                                                                    * this basic block we must save the type(s)
1692                                                                                    * we are going to replace.
1693                                                                                    */
1694                                                                                   if (srcstack <= bptr->instack && !savedstack)
1695                                                                                   {
1696                                                                                           stackptr sp;
1697                                                                                           stackptr copy;
1698                                                                                           LOG("saving input stack types");
1699                                                                                           if (!savedstackbuf) {
1700                                                                                                   LOG("allocating savedstack buffer");
1701                                                                                                   savedstackbuf = DMNEW(stackelement, cd->maxstack);
1702                                                                                                   savedstackbuf->prev = NULL;
1703                                                                                                   for (i = 1; i < cd->maxstack; ++i)
1704                                                                                                           savedstackbuf[i].prev = savedstackbuf+(i-1);
1705                                                                                           }
1706                                                                                           sp = savedstack = bptr->instack;
1707                                                                                           copy = bptr->instack = savedstackbuf + (bptr->indepth-1);
1708                                                                                           TYPESTACK_COPY(sp,copy);
1709                                                                                   }
1710
1711                                           TYPEINFO_INIT_CLASSINFO(srcstack->typeinfo,initclass);
1712                                       }
1713                                       srcstack = srcstack->prev;
1714                                   }
1715                                   /* replace uninitialized object type in locals */
1716                                                                   typevectorset_init_object(localset,ins,initclass,numlocals);
1717
1718                                   /* initializing the 'this' reference? */
1719                                   if (!ins) {
1720 #ifdef TYPECHECK_DEBUG
1721                                                                           if (!initmethod)
1722                                                                                   panic("Internal error: calling <init> on this in non-<init> method.");
1723 #endif
1724                                                                           /* must be <init> of current class or direct superclass */
1725                                                                           if (mi->class != m->class && mi->class != m->class->super)
1726                                                                                   panic("<init> calling <init> of the wrong class");
1727
1728                                       /* set our marker variable to type int */
1729                                       LOG("setting <init> marker");
1730                                                                           typevectorset_store(localset,numlocals-1,TYPE_INT,NULL);
1731                                   }
1732                                                                   else {
1733                                                                           /* initializing an instance created with NEW */
1734                                                                           /* XXX is this strictness ok? */
1735                                                                           if (mi->class != initclass)
1736                                                                                   panic("Calling <init> method of the wrong class");
1737                                                                   }
1738                               }
1739                           }
1740                           maythrow = true;
1741                           break;
1742
1743                       case ICMD_MULTIANEWARRAY:
1744                                                   {
1745                                                           vftbl_t *arrayvftbl;
1746                                                           arraydescriptor *desc;
1747
1748                                                           /* check the array lengths on the stack */
1749                                                           i = iptr[0].op1;
1750                                                           if (i<1) panic("MULTIANEWARRAY with dimensions < 1");
1751                                                           srcstack = curstack;
1752                                                           while (i--) {
1753                                                                   if (!srcstack)
1754                                                                           panic("MULTIANEWARRAY missing array length");
1755                                                                   if (srcstack->type != TYPE_INT)
1756                                                                           panic("MULTIANEWARRAY using non-int as array length");
1757                                                                   srcstack = srcstack->prev;
1758                                                           }
1759
1760                                                           /* check array descriptor */
1761                                                           arrayvftbl = (vftbl_t*) iptr[0].val.a;
1762                                                           if (!arrayvftbl)
1763                                                                   panic("MULTIANEWARRAY with unlinked class");
1764                                                           if ((desc = arrayvftbl->arraydesc) == NULL)
1765                                                                   panic("MULTIANEWARRAY with non-array class");
1766                                                           if (desc->dimension < iptr[0].op1)
1767                                                                   panic("MULTIANEWARRAY dimension to high");
1768
1769                                                           /* set the array type of the result */
1770                                                           TYPEINFO_INIT_CLASSINFO(dst->typeinfo,arrayvftbl->class);
1771                                                   }
1772                           maythrow = true;
1773                           break;
1774
1775                       case ICMD_BUILTIN3:
1776                                                   TYPECHECK_COUNT(stat_ins_builtin);
1777                           if (ISBUILTIN(BUILTIN_aastore)) {
1778                                                           TYPECHECK_ADR(curstack);
1779                                                           TYPECHECK_INT(curstack->prev);
1780                                                           TYPECHECK_ADR(curstack->prev->prev);
1781                               if (!TYPEINFO_MAYBE_ARRAY_OF_REFS(curstack->prev->prev->typeinfo))
1782                                   panic("illegal instruction: AASTORE to non-reference array");
1783                           }
1784                                                   else {
1785                                                           /* XXX put these checks in a function */
1786                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1787                                                           builtindesc = builtin_desc;
1788                                                           while (builtindesc->opcode && builtindesc->builtin
1789                                                                          != iptr->val.fp) builtindesc++;
1790                                                           if (!builtindesc->opcode) {
1791                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1792                                                                   panic("Internal error: builtin not found in table");
1793                                                           }
1794                                                           TYPECHECK_ARGS3(builtindesc->type_s3,builtindesc->type_s2,builtindesc->type_s1);
1795                                                   }
1796                           maythrow = true;
1797                           break;
1798
1799                       case ICMD_BUILTIN2:
1800                                                   TYPECHECK_COUNT(stat_ins_builtin);
1801                           if (ISBUILTIN(BUILTIN_newarray))
1802                           {
1803                                                           vftbl_t *vft;
1804                                                           TYPECHECK_INT(curstack->prev);
1805                               if (iptr[-1].opc != ICMD_ACONST)
1806                                   panic("illegal instruction: builtin_newarray without classinfo");
1807                                                           vft = (vftbl_t *)iptr[-1].val.a;
1808                                                           if (!vft)
1809                                                                   panic("ANEWARRAY with unlinked class");
1810                                                           if (!vft->arraydesc)
1811                                                                   panic("ANEWARRAY with non-array class");
1812                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,vft->class);
1813                           }
1814                           else if (ISBUILTIN(BUILTIN_arrayinstanceof))
1815                           {
1816                                                           vftbl_t *vft;
1817                                                           TYPECHECK_ADR(curstack->prev);
1818                               if (iptr[-1].opc != ICMD_ACONST)
1819                                   panic("illegal instruction: builtin_arrayinstanceof without classinfo");
1820                                                           vft = (vftbl_t *)iptr[-1].val.a;
1821                                                           if (!vft)
1822                                                                   panic("INSTANCEOF with unlinked class");
1823                                                           if (!vft->arraydesc)
1824                                                                   panic("internal error: builtin_arrayinstanceof with non-array class");
1825                                                   }
1826                           else if (ISBUILTIN(BUILTIN_checkarraycast)) {
1827                                                           vftbl_t *vft;
1828                                                           TYPECHECK_ADR(curstack->prev);
1829                               if (iptr[-1].opc != ICMD_ACONST)
1830                                   panic("illegal instruction: BUILTIN_checkarraycast without classinfo");
1831                                                           vft = (vftbl_t *)iptr[-1].val.a;
1832                                                           if (!vft)
1833                                                                   panic("CHECKCAST with unlinked class");
1834                                                           if (!vft->arraydesc)
1835                                                                   panic("internal error: builtin_checkarraycast with non-array class");
1836                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,vft->class);
1837                           }
1838                                                   else {
1839                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1840                                                           builtindesc = builtin_desc;
1841                                                           while (builtindesc->opcode && builtindesc->builtin
1842                                                                          != iptr->val.fp) builtindesc++;
1843                                                           if (!builtindesc->opcode) {
1844                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1845                                                                   panic("Internal error: builtin not found in table");
1846                                                           }
1847                                                           TYPECHECK_ARGS2(builtindesc->type_s2,builtindesc->type_s1);
1848                                                   }
1849                           maythrow = true;
1850                           break;
1851
1852                       case ICMD_BUILTIN1:
1853                                                   TYPECHECK_COUNT(stat_ins_builtin);
1854                           if (ISBUILTIN(BUILTIN_new)) {
1855
1856                               if (iptr[-1].opc != ICMD_ACONST)
1857                                   panic("illegal instruction: builtin_new without classinfo");
1858                                                           cls = (classinfo *) iptr[-1].val.a;
1859                                                           if (!cls->linked)
1860                                                                   panic("Internal error: NEW with unlinked class");
1861                                                           /* The following check also forbids array classes and interfaces: */
1862                                                           if ((cls->flags & ACC_ABSTRACT) != 0)
1863                                                                   panic("Invalid instruction: NEW creating instance of abstract class");
1864                               TYPEINFO_INIT_NEWOBJECT(dst->typeinfo,iptr);
1865                           }
1866                           else if (ISBUILTIN(BUILTIN_newarray_boolean)) {
1867                                                           TYPECHECK_INT(curstack);
1868                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_BOOLEAN);
1869                           }
1870                           else if (ISBUILTIN(BUILTIN_newarray_char)) {
1871                                                           TYPECHECK_INT(curstack);
1872                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_CHAR);
1873                           }
1874                           else if (ISBUILTIN(BUILTIN_newarray_float)) {
1875                                                           TYPECHECK_INT(curstack);
1876                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_FLOAT);
1877                           }
1878                           else if (ISBUILTIN(BUILTIN_newarray_double)) {
1879                                                           TYPECHECK_INT(curstack);
1880                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_DOUBLE);
1881                           }
1882                           else if (ISBUILTIN(BUILTIN_newarray_byte)) {
1883                                                           TYPECHECK_INT(curstack);
1884                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_BYTE);
1885                           }
1886                           else if (ISBUILTIN(BUILTIN_newarray_short)) {
1887                                                           TYPECHECK_INT(curstack);
1888                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_SHORT);
1889                           }
1890                           else if (ISBUILTIN(BUILTIN_newarray_int)) {
1891                                                           TYPECHECK_INT(curstack);
1892                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_INT);
1893                           }
1894                           else if (ISBUILTIN(BUILTIN_newarray_long)) {
1895                                                           TYPECHECK_INT(curstack);
1896                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_LONG);
1897                           }
1898                                                   else {
1899                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1900                                                           builtindesc = builtin_desc;
1901                                                           while (builtindesc->opcode && builtindesc->builtin
1902                                                                          != iptr->val.fp) builtindesc++;
1903                                                           if (!builtindesc->opcode) {
1904                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1905                                                                   panic("Internal error: builtin not found in table");
1906                                                           }
1907                                                           TYPECHECK_ARGS1(builtindesc->type_s1);
1908                                                   }
1909                           maythrow = true;
1910                           break;
1911
1912                           /****************************************/
1913                           /* SIMPLE EXCEPTION THROWING TESTS      */
1914
1915                       case ICMD_CHECKASIZE:
1916                                                   /* The argument to CHECKASIZE is typechecked by
1917                                                    * typechecking the array creation instructions. */
1918
1919                                                   /* FALLTHROUGH! */
1920                       case ICMD_NULLCHECKPOP:
1921                                                   /* NULLCHECKPOP just requires that the stack top
1922                                                    * is an address. This is checked in stack.c */
1923
1924                           maythrow = true;
1925                           break;
1926
1927                           /****************************************/
1928                           /* INSTRUCTIONS WHICH SHOULD HAVE BEEN  */
1929                           /* REPLACED BY OTHER OPCODES            */
1930
1931 #ifdef TYPECHECK_DEBUG
1932                       case ICMD_NEW:
1933                       case ICMD_NEWARRAY:
1934                       case ICMD_ANEWARRAY:
1935                       case ICMD_MONITORENTER:
1936                       case ICMD_MONITOREXIT:
1937                       case ICMD_AASTORE:
1938                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-bptr->iinstr));
1939                                                   LOG("Should have been converted to builtin function call.");
1940                           panic("Internal error: unexpected instruction encountered");
1941                           break;
1942
1943                       case ICMD_READONLY_ARG:
1944                       case ICMD_CLEAR_ARGREN:
1945                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-bptr->iinstr));
1946                                                   LOG("Should have been replaced in stack.c.");
1947                           panic("Internal error: unexpected pseudo instruction encountered");
1948                           break;
1949 #endif
1950
1951                           /****************************************/
1952                           /* UNCHECKED OPERATIONS                 */
1953
1954                                                   /*********************************************
1955                                                    * Instructions below...
1956                                                    *     *) don't operate on local variables,
1957                                                    *     *) don't operate on references,
1958                                                    *     *) don't operate on returnAddresses.
1959                                                    *
1960                                                    * (These instructions are typechecked in
1961                                                    *  analyse_stack.)
1962                                                    ********************************************/
1963
1964                           /* Instructions which may throw a runtime exception: */
1965
1966                       case ICMD_IDIV:
1967                       case ICMD_IREM:
1968                       case ICMD_LDIV:
1969                       case ICMD_LREM:
1970
1971                           maythrow = true;
1972                           break;
1973
1974                           /* Instructions which never throw a runtime exception: */
1975 #if defined(TYPECHECK_DEBUG) || defined(TYPECHECK_STATISTICS)
1976                       case ICMD_NOP:
1977                       case ICMD_POP:
1978                       case ICMD_POP2:
1979
1980                       case ICMD_ICONST:
1981                       case ICMD_LCONST:
1982                       case ICMD_FCONST:
1983                       case ICMD_DCONST:
1984
1985                       case ICMD_IFEQ_ICONST:
1986                       case ICMD_IFNE_ICONST:
1987                       case ICMD_IFLT_ICONST:
1988                       case ICMD_IFGE_ICONST:
1989                       case ICMD_IFGT_ICONST:
1990                       case ICMD_IFLE_ICONST:
1991                       case ICMD_ELSE_ICONST:
1992
1993                       case ICMD_IADD:
1994                       case ICMD_ISUB:
1995                       case ICMD_IMUL:
1996                       case ICMD_INEG:
1997                       case ICMD_IAND:
1998                       case ICMD_IOR:
1999                       case ICMD_IXOR:
2000                       case ICMD_ISHL:
2001                       case ICMD_ISHR:
2002                       case ICMD_IUSHR:
2003                       case ICMD_LADD:
2004                       case ICMD_LSUB:
2005                       case ICMD_LMUL:
2006                       case ICMD_LNEG:
2007                       case ICMD_LAND:
2008                       case ICMD_LOR:
2009                       case ICMD_LXOR:
2010                       case ICMD_LSHL:
2011                       case ICMD_LSHR:
2012                       case ICMD_LUSHR:
2013 #if 0
2014                       case ICMD_IREM0X10001:
2015                       case ICMD_LREM0X10001:
2016 #endif
2017                       case ICMD_IDIVPOW2:
2018                       case ICMD_LDIVPOW2:
2019                       case ICMD_IADDCONST:
2020                       case ICMD_ISUBCONST:
2021                       case ICMD_IMULCONST:
2022                       case ICMD_IANDCONST:
2023                       case ICMD_IORCONST:
2024                       case ICMD_IXORCONST:
2025                       case ICMD_ISHLCONST:
2026                       case ICMD_ISHRCONST:
2027                       case ICMD_IUSHRCONST:
2028                       case ICMD_IREMPOW2:
2029                       case ICMD_LADDCONST:
2030                       case ICMD_LSUBCONST:
2031                       case ICMD_LMULCONST:
2032                       case ICMD_LANDCONST:
2033                       case ICMD_LORCONST:
2034                       case ICMD_LXORCONST:
2035                       case ICMD_LSHLCONST:
2036                       case ICMD_LSHRCONST:
2037                       case ICMD_LUSHRCONST:
2038                       case ICMD_LREMPOW2:
2039
2040                       case ICMD_I2L:
2041                       case ICMD_I2F:
2042                       case ICMD_I2D:
2043                       case ICMD_L2I:
2044                       case ICMD_L2F:
2045                       case ICMD_L2D:
2046                       case ICMD_F2I:
2047                       case ICMD_F2L:
2048                       case ICMD_F2D:
2049                       case ICMD_D2I:
2050                       case ICMD_D2L:
2051                       case ICMD_D2F:
2052                       case ICMD_INT2BYTE:
2053                       case ICMD_INT2CHAR:
2054                       case ICMD_INT2SHORT:
2055
2056                       case ICMD_LCMP:
2057                       case ICMD_LCMPCONST:
2058                       case ICMD_FCMPL:
2059                       case ICMD_FCMPG:
2060                       case ICMD_DCMPL:
2061                       case ICMD_DCMPG:
2062
2063                       case ICMD_FADD:
2064                       case ICMD_DADD:
2065                       case ICMD_FSUB:
2066                       case ICMD_DSUB:
2067                       case ICMD_FMUL:
2068                       case ICMD_DMUL:
2069                       case ICMD_FDIV:
2070                       case ICMD_DDIV:
2071                       case ICMD_FREM:
2072                       case ICMD_DREM:
2073                       case ICMD_FNEG:
2074                       case ICMD_DNEG:
2075
2076
2077                       /*What shall we do with the following ?*/
2078                       case ICMD_CHECKEXCEPTION:
2079                       case ICMD_AASTORECONST:
2080                                                   TYPECHECK_COUNT(stat_ins_unchecked);
2081                           break;
2082
2083                           /****************************************/
2084
2085                       default:
2086                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-bptr->iinstr));
2087                           panic("Missing ICMD code during typecheck");
2088 #endif
2089                                         }
2090
2091                     /* the output of this instruction becomes the current stack */
2092                     curstack = dst;
2093
2094                     /* reach exception handlers for this instruction */
2095                     if (maythrow) {
2096                         LOG("reaching exception handlers");
2097                         i = 0;
2098                         while (handlers[i]) {
2099                                                         TYPECHECK_COUNT(stat_handlers_reached);
2100                                                         cls = handlers[i]->catchtype;
2101                                                         excstack.typeinfo.typeclass = (cls) ? cls
2102                                                                 : class_java_lang_Throwable;
2103                                                         repeat |= typestate_reach(cd,rd, localbuf,bptr,
2104                                                                                                           handlers[i]->handler,
2105                                                                                                           &excstack,localset,
2106                                                                                                           numlocals,
2107                                                                                                           jsrencountered);
2108                             i++;
2109                         }
2110                     }
2111
2112                     iptr++;
2113                 } /* while instructions */
2114
2115                 LOG("instructions done");
2116                 LOGSTR("RESULT=> ");
2117                 DOLOG(typestate_print(get_logfile(),curstack,localset,numlocals));
2118                 LOGNL; LOGFLUSH;
2119
2120                 /* propagate stack and variables to the following block */
2121                 if (!superblockend) {
2122                     LOG("reaching following block");
2123                     tbptr = bptr + 1;
2124                     while (tbptr->flags == BBDELETED) {
2125                         tbptr++;
2126 #ifdef TYPECHECK_DEBUG
2127                         if ((tbptr->debug_nr) >= m->basicblockcount)
2128                             panic("Control flow falls off the last block");
2129 #endif
2130                     }
2131                     TYPECHECK_REACH;
2132                 }
2133
2134                                 /* We may have to restore the types of the instack slots. They
2135                                  * have been saved if an <init> call inside the block has
2136                                  * modified the instack types. (see INVOKESPECIAL) */
2137
2138                                 if (savedstack) {
2139                                         stackptr sp = bptr->instack;
2140                                         stackptr copy = savedstack;
2141                                         TYPECHECK_COUNT(stat_savedstack);
2142                                         LOG("restoring saved instack");
2143                                         TYPESTACK_COPY(sp,copy);
2144                                         bptr->instack = savedstack;
2145                                         savedstack = NULL;
2146                                 }
2147
2148             } /* if block has to be checked */
2149             bptr++;
2150         } /* while blocks */
2151
2152         LOGIF(repeat,"repeat=true");
2153     } while (repeat);
2154
2155 #ifdef TYPECHECK_STATISTICS
2156         dolog("Typechecker did %4d iterations",count_iterations);
2157         TYPECHECK_COUNT_FREQ(stat_iterations,count_iterations,STAT_ITERATIONS);
2158         TYPECHECK_COUNTIF(jsrencountered,stat_typechecked_jsr);
2159 #endif
2160
2161 #ifdef TYPECHECK_DEBUG
2162         for (i=0; i<m->basicblockcount; ++i) {
2163                 if (m->basicblocks[i].flags != BBDELETED
2164                         && m->basicblocks[i].flags != BBUNDEF
2165                         && m->basicblocks[i].flags != BBFINISHED
2166                         && m->basicblocks[i].flags != BBTYPECHECK_UNDEF) /* typecheck may never reach
2167                                                                                                          * some exception handlers,
2168                                                                                                          * that's ok. */
2169                 {
2170                         LOG2("block L%03d has invalid flags after typecheck: %d",
2171                                  m->basicblocks[i].debug_nr,m->basicblocks[i].flags);
2172                         panic("Invalid block flags after typecheck");
2173                 }
2174         }
2175 #endif
2176
2177         /* Reset blocks we never reached */
2178         for (i=0; i<m->basicblockcount; ++i) {
2179                 if (m->basicblocks[i].flags == BBTYPECHECK_UNDEF)
2180                         m->basicblocks[i].flags = BBFINISHED;
2181         }
2182
2183     LOGimp("exiting typecheck");
2184
2185         /* just return methodinfo* to signal everything was ok */
2186
2187         return m;
2188 }
2189
2190 #undef COPYTYPE
2191
2192 #endif /* CACAO_TYPECHECK */
2193
2194 /*
2195  * These are local overrides for various environment variables in Emacs.
2196  * Please do not remove this and leave it at the end of the file, where
2197  * Emacs will automagically detect them.
2198  * ---------------------------------------------------------------------
2199  * Local variables:
2200  * mode: c
2201  * indent-tabs-mode: t
2202  * c-basic-offset: 4
2203  * tab-width: 4
2204  * End:
2205  */