src/vm/jit/verify/typecheck.c

   1 /* jit/typecheck.c - typechecking (part of bytecode verification)
   2
   3    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   4    R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser,
   5    M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck,
   6    P. Tomsich, J. Wenninger
   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 1510 2004-11-17 11:33:44Z twisti $
  30
  31 */
  32
  33 #include "global.h" /* must be here because of CACAO_TYPECHECK */
  34
  35 #ifdef CACAO_TYPECHECK
  36
  37 #include <string.h>
  38 #include "main.h"
  39 #include "builtin.h"
  40 #include "tables.h"
  41 #include "loader.h"
  42 #include "native.h"
  43 #include "types.h"
  44 #include "jit/jit.h"
  45 #include "jit/stack.h"
  46 #include "toolbox/logging.h"
  47 #include "toolbox/memory.h"
  48 #include "options.h"
  49
  50 /****************************************************************************/
  51 /* DEBUG HELPERS                                                            */
  52 /****************************************************************************/
  53
  54 #ifdef TYPECHECK_VERBOSE_OPT
  55 bool typecheckverbose = false;
  56 #define DOLOG(action)  do { if (typecheckverbose) {action;} } while(0)
  57 #else
  58 #define DOLOG(action)
  59 #endif
  60
  61 #ifdef TYPECHECK_VERBOSE
  62 #define TYPECHECK_VERBOSE_IMPORTANT
  63 #define LOG(str)           DOLOG(log_text(str))
  64 #define LOG1(str,a)        DOLOG(dolog(str,a))
  65 #define LOG2(str,a,b)      DOLOG(dolog(str,a,b))
  66 #define LOG3(str,a,b,c)    DOLOG(dolog(str,a,b,c))
  67 #define LOGIF(cond,str)    DOLOG(do {if (cond) log_text(str);} while(0))
  68 #define LOGINFO(info)      DOLOG(do {typeinfo_print_short(get_logfile(),(info));log_plain("\n");} while(0))
  69 #define LOGFLUSH           DOLOG(fflush(get_logfile()))
  70 #define LOGNL              DOLOG(log_plain("\n"))
  71 #define LOGSTR(str)        DOLOG(log_plain(str))
  72 #define LOGSTR1(str,a)     DOLOG(dolog_plain(str,a))
  73 #define LOGSTR2(str,a,b)   DOLOG(dolog_plain(str,a,b))
  74 #define LOGSTR3(str,a,b,c) DOLOG(dolog_plain(str,a,b,c))
  75 #define LOGSTRu(utf)       DOLOG(log_plain_utf(utf))
  76 #else
  77 #define LOG(str)
  78 #define LOG1(str,a)
  79 #define LOG2(str,a,b)
  80 #define LOG3(str,a,b,c)
  81 #define LOGIF(cond,str)
  82 #define LOGINFO(info)
  83 #define LOGFLUSH
  84 #define LOGNL
  85 #define LOGSTR(str)
  86 #define LOGSTR1(str,a)
  87 #define LOGSTR2(str,a,b)
  88 #define LOGSTR3(str,a,b,c)
  89 #define LOGSTRu(utf)
  90 #endif
  91
  92 #ifdef TYPECHECK_VERBOSE_IMPORTANT
  93 #define LOGimp(str)     DOLOG(log_text(str))
  94 #define LOGimpSTR(str)  DOLOG(log_plain(str))
  95 #define LOGimpSTRu(utf) DOLOG(log_plain_utf(utf))
  96 #else
  97 #define LOGimp(str)
  98 #define LOGimpSTR(str)
  99 #define LOGimpSTRu(utf)
 100 #endif
 101
 102 #if defined(TYPECHECK_VERBOSE) || defined(TYPECHECK_VERBOSE_IMPORTANT)
 103
 104 #include <stdio.h>
 105
 106 static
 107 void
 108 typestack_print(FILE *file,stackptr stack)
 109 {
 110     while (stack) {
 111         typeinfo_print_stacktype(file,stack->type,&stack->typeinfo);
 112         stack = stack->prev;
 113         if (stack) fprintf(file," ");
 114     }
 115 }
 116
 117 static
 118 void
 119 typestate_print(FILE *file,stackptr instack,typevector *localset,int size)
 120 {
 121     fprintf(file,"Stack: ");
 122     typestack_print(file,instack);
 123     fprintf(file," Locals:");
 124     typevectorset_print(file,localset,size);
 125 }
 126
 127 #endif
 128
 129 /****************************************************************************/
 130 /* STATISTICS                                                               */
 131 /****************************************************************************/
 132
 133 #ifdef TYPECHECK_DEBUG
 134 /*#define TYPECHECK_STATISTICS*/
 135 #endif
 136
 137 #ifdef TYPECHECK_STATISTICS
 138 #define STAT_ITERATIONS  10
 139 #define STAT_BLOCKS      10
 140 #define STAT_LOCALS      16
 141
 142 static int stat_typechecked = 0;
 143 static int stat_typechecked_jsr = 0;
 144 static int stat_iterations[STAT_ITERATIONS+1] = { 0 };
 145 static int stat_reached = 0;
 146 static int stat_copied = 0;
 147 static int stat_merged = 0;
 148 static int stat_merging_changed = 0;
 149 static int stat_backwards = 0;
 150 static int stat_blocks[STAT_BLOCKS+1] = { 0 };
 151 static int stat_locals[STAT_LOCALS+1] = { 0 };
 152 static int stat_ins = 0;
 153 static int stat_ins_field = 0;
 154 static int stat_ins_invoke = 0;
 155 static int stat_ins_primload = 0;
 156 static int stat_ins_aload = 0;
 157 static int stat_ins_builtin = 0;
 158 static int stat_ins_builtin_gen = 0;
 159 static int stat_ins_branch = 0;
 160 static int stat_ins_switch = 0;
 161 static int stat_ins_unchecked = 0;
 162 static int stat_handlers_reached = 0;
 163 static int stat_savedstack = 0;
 164
 165 #define TYPECHECK_COUNT(cnt)  (cnt)++
 166 #define TYPECHECK_COUNTIF(cond,cnt)  do{if(cond) (cnt)++;} while(0)
 167 #define TYPECHECK_COUNT_FREQ(array,val,limit) \
 168         do {                                                                      \
 169                 if ((val) < (limit)) (array)[val]++;  \
 170                 else (array)[limit]++;                            \
 171         } while (0)
 172
 173 static void print_freq(FILE *file,int *array,int limit)
 174 {
 175         int i;
 176         for (i=0; i<limit; ++i)
 177                 fprintf(file,"      %3d: %8d\n",i,array[i]);
 178         fprintf(file,"    =>%3d: %8d\n",limit,array[limit]);
 179 }
 180
 181 void typecheck_print_statistics(FILE *file) {
 182         fprintf(file,"typechecked methods: %8d\n",stat_typechecked);
 183         fprintf(file,"methods with JSR   : %8d\n",stat_typechecked_jsr);
 184         fprintf(file,"reached blocks     : %8d\n",stat_reached);
 185         fprintf(file,"copied states      : %8d\n",stat_copied);
 186         fprintf(file,"merged states      : %8d\n",stat_merged);
 187         fprintf(file,"merging changed    : %8d\n",stat_merging_changed);
 188         fprintf(file,"backwards branches : %8d\n",stat_backwards);
 189         fprintf(file,"handlers reached   : %8d\n",stat_handlers_reached);
 190         fprintf(file,"saved stack (times): %8d\n",stat_savedstack);
 191         fprintf(file,"instructions       : %8d\n",stat_ins);
 192         fprintf(file,"    field access   : %8d\n",stat_ins_field);
 193         fprintf(file,"    invocations    : %8d\n",stat_ins_invoke);
 194         fprintf(file,"    load primitive : %8d\n",stat_ins_primload);
 195         fprintf(file,"    load address   : %8d\n",stat_ins_aload);
 196         fprintf(file,"    builtins       : %8d\n",stat_ins_builtin);
 197         fprintf(file,"        generic    : %8d\n",stat_ins_builtin_gen);
 198         fprintf(file,"    unchecked      : %8d\n",stat_ins_unchecked);
 199         fprintf(file,"    branches       : %8d\n",stat_ins_branch);
 200         fprintf(file,"    switches       : %8d\n",stat_ins_switch);
 201         fprintf(file,"iterations used:\n");
 202         print_freq(file,stat_iterations,STAT_ITERATIONS);
 203         fprintf(file,"basic blocks per method / 10:\n");
 204         print_freq(file,stat_blocks,STAT_BLOCKS);
 205         fprintf(file,"locals:\n");
 206         print_freq(file,stat_locals,STAT_LOCALS);
 207 }
 208
 209 #else
 210
 211 #define TYPECHECK_COUNT(cnt)
 212 #define TYPECHECK_COUNTIF(cond,cnt)
 213 #define TYPECHECK_COUNT_FREQ(array,val,limit)
 214 #endif
 215
 216 /****************************************************************************/
 217 /* TYPESTACK FUNCTIONS                                                      */
 218 /****************************************************************************/
 219
 220 #define TYPESTACK_IS_RETURNADDRESS(sptr) \
 221             TYPE_IS_RETURNADDRESS((sptr)->type,(sptr)->typeinfo)
 222
 223 #define TYPESTACK_IS_REFERENCE(sptr) \
 224             TYPE_IS_REFERENCE((sptr)->type,(sptr)->typeinfo)
 225
 226 #define TYPESTACK_RETURNADDRESSSET(sptr) \
 227             ((typeinfo_retaddr_set*)TYPEINFO_RETURNADDRESS((sptr)->typeinfo))
 228
 229 #define RETURNADDRESSSET_SEEK(set,pos) \
 230             do {int i; for (i=pos;i--;) set=set->alt;} while(0)
 231
 232 #define TYPESTACK_COPY(sp,copy)                                                                 \
 233                 do {for(; sp; sp=sp->prev, copy=copy->prev) {           \
 234                                         copy->type = sp->type;                                          \
 235                                         TYPEINFO_COPY(sp->typeinfo,copy->typeinfo);     \
 236                                 }} while (0)                                                                    \
 237
 238 static void
 239 typestack_copy(stackptr dst,stackptr y,typevector *selected)
 240 {
 241         typevector *sel;
 242         typeinfo_retaddr_set *sety;
 243         typeinfo_retaddr_set *new;
 244         typeinfo_retaddr_set **next;
 245         int k;
 246
 247         for (;dst; dst=dst->prev, y=y->prev) {
 248                 if (!y) panic("Stack depth mismatch 1");
 249                 if (dst->type != y->type)
 250                         panic("Stack type mismatch 1");
 251                 LOG3("copy %p -> %p (type %d)",y,dst,dst->type);
 252                 if (dst->type == TYPE_ADDRESS) {
 253                         if (TYPEINFO_IS_PRIMITIVE(y->typeinfo)) {
 254                                 /* We copy the returnAddresses from the selected
 255                                  * states only. */
 256
 257                                 LOG("copying returnAddress");
 258                                 sety = TYPESTACK_RETURNADDRESSSET(y);
 259                                 next = &new;
 260                                 for (k=0,sel=selected; sel; sel=sel->alt) {
 261                                         LOG1("selected k=%d",sel->k);
 262                                         while (k<sel->k) {
 263                                                 sety = sety->alt;
 264                                                 k++;
 265                                         }
 266                                         *next = DNEW(typeinfo_retaddr_set);
 267                                         (*next)->addr = sety->addr;
 268                                         next = &((*next)->alt);
 269                                 }
 270                                 *next = NULL;
 271                                 TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,new);
 272                         }
 273                         else {
 274                                 TYPEINFO_CLONE(y->typeinfo,dst->typeinfo);
 275                         }
 276                 }
 277         }
 278         if (y) panic("Stack depth mismatch 2");
 279 }
 280
 281 static void
 282 typestack_put_retaddr(stackptr dst,void *retaddr,typevector *loc)
 283 {
 284 #ifdef TYPECHECK_DEBUG
 285         if (dst->type != TYPE_ADDRESS)
 286                 panic("Internal error: Storing returnAddress in non-address slot");
 287 #endif
 288
 289         TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,NULL);
 290         for (;loc; loc=loc->alt) {
 291                 typeinfo_retaddr_set *set = DNEW(typeinfo_retaddr_set);
 292                 set->addr = retaddr;
 293                 set->alt = TYPESTACK_RETURNADDRESSSET(dst);
 294                 TYPEINFO_INIT_RETURNADDRESS(dst->typeinfo,set);
 295         }
 296 }
 297
 298 static void
 299 typestack_collapse(stackptr dst)
 300 {
 301         for (; dst; dst = dst->prev) {
 302                 if (TYPESTACK_IS_RETURNADDRESS(dst))
 303                         TYPESTACK_RETURNADDRESSSET(dst)->alt = NULL;
 304         }
 305 }
 306
 307 static bool
 308 typestack_merge(stackptr dst,stackptr y)
 309 {
 310         bool changed = false;
 311         for (; dst; dst = dst->prev, y=y->prev) {
 312                 if (!y)
 313                         panic("Stack depth mismatch 3");
 314                 if (dst->type != y->type) panic("Stack type mismatch 2");
 315                 if (dst->type == TYPE_ADDRESS) {
 316                         if (TYPEINFO_IS_PRIMITIVE(dst->typeinfo)) {
 317                                 /* dst has returnAddress type */
 318                                 if (!TYPEINFO_IS_PRIMITIVE(y->typeinfo))
 319                                         panic("Merging returnAddress with reference");
 320                         }
 321                         else {
 322                                 /* dst has reference type */
 323                                 if (TYPEINFO_IS_PRIMITIVE(y->typeinfo))
 324                                         panic("Merging reference with returnAddress");
 325                                 changed |= typeinfo_merge(&(dst->typeinfo),&(y->typeinfo));
 326                         }
 327                 }
 328         }
 329         if (y) panic("Stack depth mismatch 4");
 330         return changed;
 331 }
 332
 333 static void
 334 typestack_add(stackptr dst,stackptr y,int ky)
 335 {
 336         typeinfo_retaddr_set *setd;
 337         typeinfo_retaddr_set *sety;
 338
 339         for (; dst; dst = dst->prev, y=y->prev) {
 340                 if (TYPESTACK_IS_RETURNADDRESS(dst)) {
 341                         setd = TYPESTACK_RETURNADDRESSSET(dst);
 342                         sety = TYPESTACK_RETURNADDRESSSET(y);
 343                         RETURNADDRESSSET_SEEK(sety,ky);
 344                         while (setd->alt)
 345                                 setd=setd->alt;
 346                         setd->alt = DNEW(typeinfo_retaddr_set);
 347                         setd->alt->addr = sety->addr;
 348                         setd->alt->alt = NULL;
 349                 }
 350         }
 351 }
 352
 353 /* 'a' and 'b' are assumed to have passed typestack_canmerge! */
 354 static bool
 355 typestack_separable_with(stackptr a,stackptr b,int kb)
 356 {
 357         typeinfo_retaddr_set *seta;
 358         typeinfo_retaddr_set *setb;
 359
 360         for (; a; a = a->prev, b = b->prev) {
 361 #ifdef TYPECHECK_DEBUG
 362                 if (!b) panic("Internal error: typestack_separable_from: different depth");
 363 #endif
 364                 if (TYPESTACK_IS_RETURNADDRESS(a)) {
 365 #ifdef TYPECHECK_DEBUG
 366                         if (!TYPESTACK_IS_RETURNADDRESS(b))
 367                                 panic("Internal error: typestack_separable_from: unmergable stacks");
 368 #endif
 369                         seta = TYPESTACK_RETURNADDRESSSET(a);
 370                         setb = TYPESTACK_RETURNADDRESSSET(b);
 371                         RETURNADDRESSSET_SEEK(setb,kb);
 372
 373                         for (;seta;seta=seta->alt)
 374                                 if (seta->addr != setb->addr) return true;
 375                 }
 376         }
 377 #ifdef TYPECHECK_DEBUG
 378         if (b) panic("Internal error: typestack_separable_from: different depth");
 379 #endif
 380         return false;
 381 }
 382
 383 /* 'a' and 'b' are assumed to have passed typestack_canmerge! */
 384 static bool
 385 typestack_separable_from(stackptr a,int ka,stackptr b,int kb)
 386 {
 387         typeinfo_retaddr_set *seta;
 388         typeinfo_retaddr_set *setb;
 389
 390         for (; a; a = a->prev, b = b->prev) {
 391 #ifdef TYPECHECK_DEBUG
 392                 if (!b) panic("Internal error: typestack_separable_from: different depth");
 393 #endif
 394                 if (TYPESTACK_IS_RETURNADDRESS(a)) {
 395 #ifdef TYPECHECK_DEBUG
 396                         if (!TYPESTACK_IS_RETURNADDRESS(b))
 397                                 panic("Internal error: typestack_separable_from: unmergable stacks");
 398 #endif
 399                         seta = TYPESTACK_RETURNADDRESSSET(a);
 400                         setb = TYPESTACK_RETURNADDRESSSET(b);
 401                         RETURNADDRESSSET_SEEK(seta,ka);
 402                         RETURNADDRESSSET_SEEK(setb,kb);
 403
 404                         if (seta->addr != setb->addr) return true;
 405                 }
 406         }
 407 #ifdef TYPECHECK_DEBUG
 408         if (b) panic("Internal error: typestack_separable_from: different depth");
 409 #endif
 410         return false;
 411 }
 412
 413 /****************************************************************************/
 414 /* TYPESTATE FUNCTIONS                                                      */
 415 /****************************************************************************/
 416
 417 static bool
 418 typestate_merge(stackptr deststack,typevector *destloc,
 419                                 stackptr ystack,typevector *yloc,
 420                                 int locsize,bool jsrencountered)
 421 {
 422         typevector *dvec,*yvec;
 423         int kd,ky;
 424         bool changed = false;
 425
 426         LOG("merge:");
 427         LOGSTR("dstack: "); DOLOG(typestack_print(get_logfile(),deststack)); LOGNL;
 428         LOGSTR("ystack: "); DOLOG(typestack_print(get_logfile(),ystack)); LOGNL;
 429         LOGSTR("dloc  : "); DOLOG(typevectorset_print(get_logfile(),destloc,locsize)); LOGNL;
 430         LOGSTR("yloc  : "); DOLOG(typevectorset_print(get_logfile(),yloc,locsize)); LOGNL;
 431         LOGFLUSH;
 432
 433         /* The stack is always merged. If there are returnAddresses on
 434          * the stack they are ignored in this step. */
 435
 436         changed |= typestack_merge(deststack,ystack);
 437
 438         if (!jsrencountered)
 439                 return typevector_merge(destloc,yloc,locsize);
 440
 441         for (yvec=yloc; yvec; yvec=yvec->alt) {
 442                 ky = yvec->k;
 443
 444                 /* Check if the typestates (deststack,destloc) will be
 445                  * separable when (ystack,yvec) is added. */
 446
 447                 if (!typestack_separable_with(deststack,ystack,ky)
 448                         && !typevectorset_separable_with(destloc,yvec,locsize))
 449                 {
 450                         /* No, the resulting set won't be separable, thus we
 451                          * may merge all states in (deststack,destloc) and
 452                          * (ystack,yvec). */
 453
 454                         typestack_collapse(deststack);
 455                         typevectorset_collapse(destloc,locsize);
 456                         typevector_merge(destloc,yvec,locsize);
 457                 }
 458                 else {
 459                         /* Yes, the resulting set will be separable. Thus we check
 460                          * if we may merge (ystack,yvec) with a single state in
 461                          * (deststack,destloc). */
 462
 463                         for (dvec=destloc,kd=0; dvec; dvec=dvec->alt, kd++) {
 464                                 if (!typestack_separable_from(ystack,ky,deststack,kd)
 465                                         && !typevector_separable_from(yvec,dvec,locsize))
 466                                 {
 467                                         /* The typestate (ystack,yvec) is not separable from
 468                                          * (deststack,dvec) by any returnAddress. Thus we may
 469                                          * merge the states. */
 470
 471                                         changed |= typevector_merge(dvec,yvec,locsize);
 472
 473                                         goto merged;
 474                                 }
 475                         }
 476
 477                         /* The typestate (ystack,yvec) is separable from all typestates
 478                          * (deststack,destloc). Thus we must add this state to the
 479                          * result set. */
 480
 481                         typestack_add(deststack,ystack,ky);
 482                         typevectorset_add(destloc,yvec,locsize);
 483                         changed = true;
 484                 }
 485
 486         merged:
 487                 ;
 488         }
 489
 490         LOG("result:");
 491         LOGSTR("dstack: "); DOLOG(typestack_print(get_logfile(),deststack)); LOGNL;
 492         LOGSTR("dloc  : "); DOLOG(typevectorset_print(get_logfile(),destloc,locsize)); LOGNL;
 493         LOGFLUSH;
 494
 495         return changed;
 496 }
 497
 498
 499 static bool
 500 typestate_reach(codegendata *cd, registerdata *rd,void *localbuf,
 501                                 basicblock *current,
 502                                 basicblock *destblock,
 503                                 stackptr ystack,typevector *yloc,
 504                                 int locsize,bool jsrencountered)
 505 {
 506         typevector *destloc;
 507         int destidx;
 508         bool changed = false;
 509
 510         LOG1("reaching block L%03d",destblock->debug_nr);
 511         TYPECHECK_COUNT(stat_reached);
 512
 513         destidx = destblock - cd->method->basicblocks;
 514         destloc = MGET_TYPEVECTOR(localbuf,destidx,locsize);
 515
 516         /* When branching backwards we have to check for uninitialized objects */
 517
 518         if (destblock <= current) {
 519                 stackptr sp;
 520                 int i;
 521 #warning FIXME FOR INLINING
 522                 if (!useinlining) {
 523                         TYPECHECK_COUNT(stat_backwards);
 524                         LOG("BACKWARDS!");
 525                         for (sp = ystack; sp; sp=sp->prev)
 526                                 if (sp->type == TYPE_ADR &&
 527                                 TYPEINFO_IS_NEWOBJECT(sp->typeinfo)) {
 528                                         show_icmd_method(cd->method,cd,rd);
 529                                 printf("current: %ld, dest: %ld\n",current->debug_nr,destblock->debug_nr);
 530                                 panic("Branching backwards with uninitialized object on stack");
 531                         }
 532
 533                         for (i=0; i<locsize; ++i)
 534                                 if (yloc->td[i].type == TYPE_ADR &&
 535                                 TYPEINFO_IS_NEWOBJECT(yloc->td[i].info))
 536                                         panic("Branching backwards with uninitialized object in local variable");
 537                 }
 538         }
 539
 540         if (destblock->flags == BBTYPECHECK_UNDEF) {
 541                 /* The destblock has never been reached before */
 542
 543                 TYPECHECK_COUNT(stat_copied);
 544                 LOG1("block (index %04d) reached first time",destidx);
 545
 546                 typestack_copy(destblock->instack,ystack,yloc);
 547                 COPY_TYPEVECTORSET(yloc,destloc,locsize);
 548                 changed = true;
 549         }
 550         else {
 551                 /* The destblock has already been reached before */
 552
 553                 TYPECHECK_COUNT(stat_merged);
 554                 LOG1("block (index %04d) reached before",destidx);
 555
 556                 changed = typestate_merge(destblock->instack,destloc,
 557                                                                   ystack,yloc,locsize,
 558                                                                   jsrencountered);
 559                 TYPECHECK_COUNTIF(changed,stat_merging_changed);
 560         }
 561
 562         if (changed) {
 563                 LOG("changed!");
 564                 destblock->flags = BBTYPECHECK_REACHED;
 565                 if (destblock <= current) {LOG("REPEAT!"); return true;}
 566         }
 567         return false;
 568 }
 569
 570
 571 static bool
 572 typestate_ret(codegendata *cd,registerdata *rd, void *localbuf,
 573                           basicblock *current,
 574                           stackptr ystack,typevector *yloc,
 575                           int retindex,int locsize)
 576 {
 577         typevector *yvec;
 578         typevector *selected;
 579         basicblock *destblock;
 580         bool repeat = false;
 581
 582         for (yvec=yloc; yvec; ) {
 583                 if (!TYPEDESC_IS_RETURNADDRESS(yvec->td[retindex]))
 584                         panic("Illegal instruction: RET on non-returnAddress");
 585
 586                 destblock = (basicblock*) TYPEINFO_RETURNADDRESS(yvec->td[retindex].info);
 587
 588                 selected = typevectorset_select(&yvec,retindex,destblock);
 589
 590                 repeat |= typestate_reach(cd, rd,  localbuf,current,destblock,
 591                                                                   ystack,selected,locsize,true);
 592         }
 593         return repeat;
 594 }
 595
 596 /****************************************************************************/
 597 /* HELPER FUNCTIONS                                                         */
 598 /****************************************************************************/
 599
 600 /* If a field is checked, definingclass == implementingclass */
 601 static bool
 602 is_accessible(int flags,classinfo *definingclass,classinfo *implementingclass, classinfo *methodclass,
 603                           typeinfo *instance)
 604 {
 605         /* check access rights */
 606         if (methodclass != definingclass) {
 607                 switch (flags & (ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED)) {
 608                   case ACC_PUBLIC:
 609                           break;
 610
 611                           /* In the cases below, definingclass cannot be an interface */
 612
 613                   case 0:
 614                           if (definingclass->packagename != methodclass->packagename)
 615                                   return false;
 616                           break;
 617                   case ACC_PROTECTED:
 618                           if (definingclass->packagename != methodclass->packagename) {
 619                                   if (!builtin_isanysubclass(methodclass,implementingclass))
 620                                           return false;
 621
 622                                   /* For protected access of super class members in another
 623                                    * package the instance must be a subclass of or the same
 624                                    * as the current class. */
 625                                   LOG("protected access into other package");
 626                                   implementingclass = methodclass;
 627                           }
 628                           break;
 629                   case ACC_PRIVATE:
 630                           if (definingclass != methodclass) {
 631                                   LOG("private access");
 632                                   return false;
 633                           }
 634                           break;
 635                   default:
 636                           panic("Invalid access flags");
 637                 }
 638         }
 639
 640         if (instance) {
 641                 if ((flags & ACC_STATIC) != 0) {
 642                         LOG("accessing STATIC member with instance");
 643                         return false;
 644                 }
 645
 646                 if (implementingclass
 647                         && !TYPEINFO_IS_NULLTYPE(*instance)
 648                         && !TYPEINFO_IS_NEWOBJECT(*instance))
 649                 {
 650                         if (!typeinfo_is_assignable_to_classinfo(instance,
 651                                                                                                          implementingclass))
 652                         {
 653                                 LOG("instance not assignable");
 654                                 LOGINFO(instance);
 655                                 LOGSTRu(implementingclass->name); LOGNL; LOGFLUSH;
 656                                 return false;
 657                         }
 658                 }
 659         }
 660         else {
 661                 if ((flags & ACC_STATIC) == 0) {
 662                         LOG("accessing non-STATIC member without instance");
 663                         return false;
 664                 }
 665         }
 666
 667         return true;
 668 }
 669
 670 /****************************************************************************/
 671 /* MACROS FOR LOCAL VARIABLE CHECKING                                       */
 672 /****************************************************************************/
 673
 674 #define INDEX_ONEWORD(num)                                                                              \
 675         do { if((num)<0 || (num)>=validlocals)                                          \
 676                         panic("Invalid local variable index"); } while (0)
 677 #define INDEX_TWOWORD(num)                                                                              \
 678         do { if((num)<0 || ((num)+1)>=validlocals)                                      \
 679                         panic("Invalid local variable index"); } while (0)
 680
 681 #define STORE_ONEWORD(num,type)                                                                 \
 682         do {typevectorset_store(localset,num,type,NULL);} while(0)
 683
 684 #define STORE_TWOWORD(num,type)                                                                         \
 685         do {typevectorset_store_twoword(localset,num,type);} while(0)
 686
 687
 688 #define WORDCHECKFAULT \
 689         do { \
 690                 show_icmd_method(m, cd, rd); \
 691                 dolog("localset->td index: %ld\ninstruction belongs to:%s.%s, outermethod:%s.%s\n", \
 692                 iptr->op1,iptr->method->class->name->text, \
 693                         iptr->method->name->text,m->class->name->text,m->name->text); \
 694                 show_icmd(iptr++, false); \
 695                 show_icmd(iptr, false); \
 696         } while (0)
 697
 698
 699 #define CHECK_ONEWORD(num,tp)                                                                                   \
 700         do {TYPECHECK_COUNT(stat_ins_primload);                                                         \
 701                 if (jsrencountered) {                                                                                   \
 702                         if (!typevectorset_checktype(localset,num,tp)) {                                \
 703                                 WORDCHECKFAULT; \
 704                                 panic("Variable type mismatch");                                                \
 705                         }       \
 706                 }                                                                                                                               \
 707                 else {                                                                                                                  \
 708                         if (localset->td[num].type != tp) {                                                     \
 709                                 panic("Variable type mismatch");                                                \
 710                                 WORDCHECKFAULT; \
 711                         } \
 712                 }                                                                                                                               \
 713                 } while(0)
 714
 715 #define CHECK_TWOWORD(num,type)                                                                                 \
 716         do {TYPECHECK_COUNT(stat_ins_primload);                                                         \
 717                 if (!typevectorset_checktype(localset,num,type)) {                \
 718                         WORDCHECKFAULT; \
 719                         panic("Variable type mismatch");                                \
 720                 } \
 721         } while(0)
 722
 723 /****************************************************************************/
 724 /* MACROS FOR STACK TYPE CHECKING                                           */
 725 /****************************************************************************/
 726
 727 /* These macros are for basic typechecks which were not done in stack.c */
 728
 729 #define TYPECHECK_STACK(sp,tp)                                                          \
 730         do { if ((sp)->type != (tp))                                                    \
 731                         panic("Wrong data type on stack"); } while(0)
 732
 733 #define TYPECHECK_ADR(sp)  TYPECHECK_STACK(sp,TYPE_ADR)
 734 #define TYPECHECK_INT(sp)  TYPECHECK_STACK(sp,TYPE_INT)
 735 #define TYPECHECK_LNG(sp)  TYPECHECK_STACK(sp,TYPE_LNG)
 736 #define TYPECHECK_FLT(sp)  TYPECHECK_STACK(sp,TYPE_FLT)
 737 #define TYPECHECK_DBL(sp)  TYPECHECK_STACK(sp,TYPE_DBL)
 738
 739 #define TYPECHECK_ARGS1(t1)                                                                 \
 740         do {TYPECHECK_STACK(curstack,t1);} while (0)
 741 #define TYPECHECK_ARGS2(t1,t2)                                                      \
 742         do {TYPECHECK_ARGS1(t1);                                                                        \
 743                 TYPECHECK_STACK(curstack->prev,t2);} while (0)
 744 #define TYPECHECK_ARGS3(t1,t2,t3)                                                               \
 745         do {TYPECHECK_ARGS2(t1,t2);                                                                     \
 746                 TYPECHECK_STACK(curstack->prev->prev,t3);} while (0)
 747
 748 /****************************************************************************/
 749 /* MISC MACROS                                                              */
 750 /****************************************************************************/
 751
 752 #define COPYTYPE(source,dest)   \
 753         {if ((source)->type == TYPE_ADR)                                                                \
 754                         TYPEINFO_COPY((source)->typeinfo,(dest)->typeinfo);}
 755
 756 #define ISBUILTIN(v)   (iptr->val.fp == (functionptr) (v))
 757
 758 /* TYPECHECK_REACH: executed, when the target block (tbptr) can be reached
 759  *     from the current block (bptr). The types of local variables and
 760  *     stack slots are propagated to the target block.
 761  * Input:
 762  *     bptr.......current block
 763  *     tbptr......target block
 764  *     dst........current output stack pointer
 765  *     numlocals..number of local variables
 766  *     localset...current local variable vectorset
 767  *     localbuf...local variable vectorset buffer
 768  *     jsrencountered...true if a JSR has been seen
 769  * Output:
 770  *     repeat.....changed to true if a block before the current
 771  *                block has changed
 772  */
 773 #define TYPECHECK_REACH                                                 \
 774     do {                                                                \
 775     repeat |= typestate_reach(cd,rd, localbuf,bptr,tbptr,dst,               \
 776                                                           localset,numlocals,jsrencountered);       \
 777     LOG("done.");                                                       \
 778     } while (0)
 779
 780 /* TYPECHECK_LEAVE: executed when the method is exited non-abruptly
 781  * Input:
 782  *     class........class of the current method
 783  *     numlocals....number of local variables
 784  *     localset.....current local variable vectorset
 785  *     initmethod...true if this is an <init> method
 786  */
 787 #define TYPECHECK_LEAVE                                                 \
 788     do {                                                                \
 789         if (initmethod && m->class != class_java_lang_Object) {         \
 790             /* check the marker variable */                             \
 791             LOG("Checking <init> marker");                              \
 792             if (!typevectorset_checktype(localset,numlocals-1,TYPE_INT))\
 793                 panic("<init> method does not initialize 'this'");      \
 794         }                                                               \
 795     } while (0)
 796
 797 /****************************************************************************/
 798 /* typecheck()                                                              */
 799 /****************************************************************************/
 800
 801 #define MAXPARAMS 255
 802
 803 /* typecheck is called directly after analyse_stack */
 804
 805 methodinfo *typecheck(methodinfo *m, codegendata *cd, registerdata *rd)
 806 {
 807     int b_count, b_index;
 808     stackptr curstack;      /* input stack top for current instruction */
 809     stackptr srcstack;         /* source stack for copying and merging */
 810     int opcode;                                      /* current opcode */
 811     int i;                                        /* temporary counter */
 812     int len;                        /* for counting instructions, etc. */
 813     bool superblockend;        /* true if no fallthrough to next block */
 814     bool repeat;            /* if true, blocks are iterated over again */
 815     instruction *iptr;               /* pointer to current instruction */
 816     basicblock *bptr;                /* pointer to current basic block */
 817     basicblock *tbptr;                   /* temporary for target block */
 818
 819     int numlocals;                        /* number of local variables */
 820         int validlocals;         /* number of valid local variable indices */
 821         void *localbuf;       /* local variable types for each block start */
 822         typevector *localset;        /* typevector set for local variables */
 823         typevector *lset;                             /* temporary pointer */
 824         typedescriptor *td;                           /* temporary pointer */
 825
 826         stackptr savedstackbuf = NULL;      /* buffer for saving the stack */
 827         stackptr savedstack = NULL;      /* saved instack of current block */
 828
 829         stackelement excstack;           /* instack for exception handlers */
 830
 831         typedescriptor returntype;        /* return type of current method */
 832     u1 *ptype;                     /* parameter types of called method */
 833     typeinfo *pinfo;           /* parameter typeinfos of called method */
 834     int rtype;                         /* return type of called method */
 835     typeinfo rinfo;       /* typeinfo for return type of called method */
 836
 837     stackptr dst;               /* output stack of current instruction */
 838     basicblock **tptr;    /* pointer into target list of switch instr. */
 839     exceptiontable **handlers;            /* active exception handlers */
 840     classinfo *cls;                                       /* temporary */
 841     bool maythrow;               /* true if this instruction may throw */
 842     static utf *name_init;                                 /* "<init>" */
 843     bool initmethod;             /* true if this is an "<init>" method */
 844         builtin_descriptor *builtindesc;    /* temp. descriptor of builtin */
 845         bool jsrencountered = false;         /* true if we there was a JSR */
 846
 847     classinfo *myclass;
 848
 849 #ifdef TYPECHECK_STATISTICS
 850         int count_iterations = 0;
 851         TYPECHECK_COUNT(stat_typechecked);
 852         TYPECHECK_COUNT_FREQ(stat_locals,m->codegendata->maxlocals,STAT_LOCALS);
 853         TYPECHECK_COUNT_FREQ(stat_blocks,m->basicblockcount/10,STAT_BLOCKS);
 854 #endif
 855
 856     LOGSTR("\n==============================================================================\n");
 857     DOLOG(show_icmd_method());
 858     LOGSTR("\n==============================================================================\n");
 859     LOGimpSTR("Entering typecheck: ");
 860     LOGimpSTRu(method->name);
 861     LOGimpSTR("    ");
 862     LOGimpSTRu(method->descriptor);
 863     LOGimpSTR("    (class ");
 864     LOGimpSTRu(method->class->name);
 865     LOGimpSTR(")\n");
 866         LOGFLUSH;
 867
 868         if (!name_init)
 869                 name_init = utf_new_char("<init>");
 870     initmethod = (m->name == name_init);
 871
 872         /* Allocate buffer for method arguments */
 873
 874     ptype = DMNEW(u1,MAXPARAMS);
 875     pinfo = DMNEW(typeinfo,MAXPARAMS);
 876
 877     LOG("Buffer allocated.\n");
 878
 879     /* reset all BBFINISHED blocks to BBTYPECHECK_UNDEF. */
 880     b_count = m->basicblockcount;
 881     bptr = m->basicblocks;
 882     while (--b_count >= 0) {
 883 #ifdef TYPECHECK_DEBUG
 884         if (bptr->flags != BBFINISHED && bptr->flags != BBDELETED
 885             && bptr->flags != BBUNDEF)
 886         {
 887             show_icmd_method();
 888             LOGSTR1("block flags: %d\n",bptr->flags); LOGFLUSH;
 889             panic("Internal error: Unexpected block flags in typecheck()");
 890         }
 891 #endif
 892         if (bptr->flags >= BBFINISHED) {
 893             bptr->flags = BBTYPECHECK_UNDEF;
 894         }
 895         bptr++;
 896     }
 897
 898     /* The first block is always reached */
 899     if (m->basicblockcount && m->basicblocks[0].flags == BBTYPECHECK_UNDEF)
 900         m->basicblocks[0].flags = BBTYPECHECK_REACHED;
 901
 902     LOG("Blocks reset.\n");
 903
 904     /* number of local variables */
 905
 906     /* In <init> methods we use an extra local variable to signal if
 907      * the 'this' reference has been initialized. */
 908     numlocals = cd->maxlocals;
 909         validlocals = numlocals;
 910     if (initmethod) numlocals++;
 911
 912     /* allocate the buffers for local variables */
 913         localbuf = DMNEW_TYPEVECTOR(m->basicblockcount+1, numlocals);
 914         localset = MGET_TYPEVECTOR(localbuf,m->basicblockcount,numlocals);
 915
 916     LOG("Variable buffer allocated.\n");
 917
 918     /* allocate the buffer of active exception handlers */
 919     handlers = DMNEW(exceptiontable*, cd->exceptiontablelength + 1);
 920
 921     /* initialize the variable types of the first block */
 922     /* to the types of the arguments */
 923         lset = MGET_TYPEVECTOR(localbuf,0,numlocals);
 924         lset->k = 0;
 925         lset->alt = NULL;
 926         td = lset->td;
 927         i = validlocals;
 928
 929     /* if this is an instance method initialize the "this" ref type */
 930     if (!(m->flags & ACC_STATIC)) {
 931                 if (!i)
 932                         panic("Not enough local variables for method arguments");
 933         td->type = TYPE_ADDRESS;
 934         if (initmethod)
 935             TYPEINFO_INIT_NEWOBJECT(td->info,NULL);
 936         else
 937             TYPEINFO_INIT_CLASSINFO(td->info, m->class);
 938         td++;
 939                 i--;
 940     }
 941
 942     LOG("'this' argument set.\n");
 943
 944     /* the rest of the arguments and the return type */
 945     i = typedescriptors_init_from_method_args(td, m->descriptor,
 946                                                                                           i,
 947                                                                                           true, /* two word types use two slots */
 948                                                                                           &returntype);
 949         td += i;
 950         i = numlocals - (td - lset->td);
 951         while (i--) {
 952                 td->type = TYPE_VOID;
 953                 td++;
 954         }
 955
 956     LOG("Arguments set.\n");
 957
 958     /* initialize the input stack of exception handlers */
 959         excstack.prev = NULL;
 960         excstack.type = TYPE_ADR;
 961         TYPEINFO_INIT_CLASSINFO(excstack.typeinfo,
 962                                                         class_java_lang_Throwable); /* changed later */
 963
 964     LOG("Exception handler stacks set.\n");
 965
 966     /* loop while there are still blocks to be checked */
 967     do {
 968                 TYPECHECK_COUNT(count_iterations);
 969
 970         repeat = false;
 971
 972         b_count = m->basicblockcount;
 973         bptr = m->basicblocks;
 974
 975         while (--b_count >= 0) {
 976             LOGSTR1("---- BLOCK %04d, ",bptr-block);
 977             LOGSTR1("blockflags: %d\n",bptr->flags);
 978             LOGFLUSH;
 979
 980             if (bptr->flags == BBTYPECHECK_REACHED) {
 981                 LOGSTR1("\n---- BLOCK %04d ------------------------------------------------\n",bptr-block);
 982                 LOGFLUSH;
 983
 984                 superblockend = false;
 985                 bptr->flags = BBFINISHED;
 986                 b_index = bptr - m->basicblocks;
 987
 988                 /* init stack at the start of this block */
 989                 curstack = bptr->instack;
 990
 991                 /* determine the active exception handlers for this block */
 992                 /* XXX could use a faster algorithm with sorted lists or
 993                  * something? */
 994                 len = 0;
 995                 for (i = 0; i < cd->exceptiontablelength; ++i) {
 996                     if ((cd->exceptiontable[i].start <= bptr) && (cd->exceptiontable[i].end > bptr)) {
 997                         LOG1("active handler L%03d", cd->exceptiontable[i].handler->debug_nr);
 998                         handlers[len++] = cd->exceptiontable + i;
 999                     }
1000                 }
1001                 handlers[len] = NULL;
1002
1003                 /* init variable types at the start of this block */
1004                                 COPY_TYPEVECTORSET(MGET_TYPEVECTOR(localbuf,b_index,numlocals),
1005                                                                    localset,numlocals);
1006 #if defined(__GNUC__)
1007 #warning FIXME FOR INLINING
1008 #endif
1009                 if(!useinlining) {
1010                                 if (handlers[0])
1011                                         for (i=0; i<numlocals; ++i)
1012                                                 if (localset->td[i].type == TYPE_ADR
1013                                                         && TYPEINFO_IS_NEWOBJECT(localset->td[i].info)) {
1014                                                                 show_icmd_method(m, cd, rd);
1015                                                                 printf("Uninitialized variale:%ld, block:%ld\n",i,bptr->debug_nr);
1016                                                                 panic("Uninitialized object in local variable inside try block");
1017                                                         }
1018                 }
1019                                 DOLOG(typestate_print(get_logfile(),curstack,localset,numlocals));
1020                                 LOGNL; LOGFLUSH;
1021
1022                 /* loop over the instructions */
1023                 len = bptr->icount;
1024                 iptr = bptr->iinstr;
1025                 while (--len >= 0)  {
1026                                         TYPECHECK_COUNT(stat_ins);
1027                     DOLOG(show_icmd(iptr,false)); LOGNL; LOGFLUSH;
1028
1029                     opcode = iptr->opc;
1030                     myclass = iptr->method->class;
1031                     dst = iptr->dst;
1032                     maythrow = false;
1033
1034                     switch (opcode) {
1035
1036                         /****************************************/
1037                         /* STACK MANIPULATIONS                  */
1038
1039                         /* We just need to copy the typeinfo */
1040                         /* for slots containing addresses.   */
1041
1042                         /* XXX We assume that the destination stack
1043                          * slots were continuously allocated in
1044                          * memory.  (The current implementation in
1045                          * stack.c)
1046                          */
1047
1048                       case ICMD_DUP:
1049                           COPYTYPE(curstack,dst);
1050                           break;
1051
1052                       case ICMD_DUP_X1:
1053                           COPYTYPE(curstack,dst);
1054                           COPYTYPE(curstack,dst-2);
1055                           COPYTYPE(curstack->prev,dst-1);
1056                           break;
1057
1058                       case ICMD_DUP_X2:
1059                           COPYTYPE(curstack,dst);
1060                           COPYTYPE(curstack,dst-3);
1061                           COPYTYPE(curstack->prev,dst-1);
1062                           COPYTYPE(curstack->prev->prev,dst-2);
1063                           break;
1064
1065                       case ICMD_DUP2:
1066                           COPYTYPE(curstack,dst);
1067                           COPYTYPE(curstack->prev,dst-1);
1068                           break;
1069
1070                       case ICMD_DUP2_X1:
1071                           COPYTYPE(curstack,dst);
1072                           COPYTYPE(curstack->prev,dst-1);
1073                           COPYTYPE(curstack,dst-3);
1074                           COPYTYPE(curstack->prev,dst-4);
1075                           COPYTYPE(curstack->prev->prev,dst-2);
1076                           break;
1077
1078                       case ICMD_DUP2_X2:
1079                           COPYTYPE(curstack,dst);
1080                           COPYTYPE(curstack->prev,dst-1);
1081                           COPYTYPE(curstack,dst-4);
1082                           COPYTYPE(curstack->prev,dst-5);
1083                           COPYTYPE(curstack->prev->prev,dst-2);
1084                           COPYTYPE(curstack->prev->prev->prev,dst-3);
1085                           break;
1086
1087                       case ICMD_SWAP:
1088                           COPYTYPE(curstack,dst-1);
1089                           COPYTYPE(curstack->prev,dst);
1090                           break;
1091
1092                           /****************************************/
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102                           /* PRIMITIVE VARIABLE ACCESS            */
1103
1104                       case ICMD_ILOAD: CHECK_ONEWORD(iptr->op1,TYPE_INT); break;
1105                       case ICMD_FLOAD: CHECK_ONEWORD(iptr->op1,TYPE_FLOAT); break;
1106                       case ICMD_IINC:  CHECK_ONEWORD(iptr->op1,TYPE_INT); break;
1107                       case ICMD_LLOAD: CHECK_TWOWORD(iptr->op1,TYPE_LONG); break;
1108                       case ICMD_DLOAD: CHECK_TWOWORD(iptr->op1,TYPE_DOUBLE); break;
1109
1110                       case ICMD_FSTORE: STORE_ONEWORD(iptr->op1,TYPE_FLOAT); break;
1111                       case ICMD_ISTORE: STORE_ONEWORD(iptr->op1,TYPE_INT); break;
1112                       case ICMD_LSTORE: STORE_TWOWORD(iptr->op1,TYPE_LONG); break;
1113                       case ICMD_DSTORE: STORE_TWOWORD(iptr->op1,TYPE_DOUBLE); break;
1114
1115                           /****************************************/
1116                           /* LOADING ADDRESS FROM VARIABLE        */
1117
1118                       case ICMD_ALOAD:
1119                                                   TYPECHECK_COUNT(stat_ins_aload);
1120
1121                           /* loading a returnAddress is not allowed */
1122                                                   if (jsrencountered) {
1123                                                           if (!typevectorset_checkreference(localset,iptr->op1))
1124                                                                   panic("illegal instruction: ALOAD loading non-reference");
1125
1126                                                           typevectorset_copymergedtype(localset,iptr->op1,&(dst->typeinfo));
1127                                                   }
1128                                                   else {
1129                                                           if (!TYPEDESC_IS_REFERENCE(localset->td[iptr->op1])) {
1130                                                                   show_icmd_method(m, cd, rd);
1131                                                                   dolog("localset->td index: %ld\ninstruction belongs to:%s.%s, outermethod:%s.%s\n",
1132                                                                         iptr->op1,iptr->method->class->name->text,
1133                                                                         iptr->method->name->text,m->class->name->text,m->name->text);
1134                                                                   show_icmd(iptr, false);
1135                                                                   panic("illegal instruction: ALOAD loading non-reference");
1136                                                           }
1137                                                           TYPEINFO_COPY(localset->td[iptr->op1].info,dst->typeinfo);
1138                                                   }
1139                           break;
1140
1141                           /****************************************/
1142                           /* STORING ADDRESS TO VARIABLE          */
1143
1144                       case ICMD_ASTORE:
1145                           if (handlers[0] &&
1146                               TYPEINFO_IS_NEWOBJECT(curstack->typeinfo))
1147                               panic("Storing uninitialized object in local variable inside try block");
1148
1149                                                   if (TYPESTACK_IS_RETURNADDRESS(curstack))
1150                                                           typevectorset_store_retaddr(localset,iptr->op1,&(curstack->typeinfo));
1151                                                   else
1152                                                           typevectorset_store(localset,iptr->op1,TYPE_ADDRESS,
1153                                                                                                   &(curstack->typeinfo));
1154                           break;
1155
1156                           /****************************************/
1157                           /* LOADING ADDRESS FROM ARRAY           */
1158
1159                       case ICMD_AALOAD:
1160                           if (!TYPEINFO_MAYBE_ARRAY_OF_REFS(curstack->prev->typeinfo))
1161                               panic("illegal instruction: AALOAD on non-reference array");
1162
1163                           typeinfo_init_component(&curstack->prev->typeinfo,&dst->typeinfo);
1164                           maythrow = true;
1165                           break;
1166
1167                           /****************************************/
1168                           /* FIELD ACCESS                         */
1169
1170                       case ICMD_PUTFIELD:
1171                                                   TYPECHECK_COUNT(stat_ins_field);
1172                           if (!TYPEINFO_IS_REFERENCE(curstack->prev->typeinfo))
1173                               panic("illegal instruction: PUTFIELD on non-reference");
1174                           if (TYPEINFO_IS_ARRAY(curstack->prev->typeinfo))
1175                               panic("illegal instruction: PUTFIELD on array");
1176
1177                           /* check if the value is assignable to the field */
1178                                                   {
1179                                                           fieldinfo *fi = (fieldinfo*) iptr[0].val.a;
1180
1181                                                           if (TYPEINFO_IS_NEWOBJECT(curstack->prev->typeinfo)) {
1182                                                                   if (initmethod
1183                                                                           && !TYPEINFO_NEWOBJECT_INSTRUCTION(curstack->prev->typeinfo))
1184                                                                   {
1185                                                                           /* uninitialized "this" instance */
1186                                                                           if (fi->class != m->class || (fi->flags & ACC_STATIC) != 0)
1187                                                                                   panic("Setting unaccessible field in uninitialized object");
1188                                                                   }
1189                                                                   else {
1190                                                                           panic("PUTFIELD on uninitialized object");
1191                                                                   }
1192                                                           }
1193                                                           else {
1194                                                                   if (!is_accessible(fi->flags,fi->class,fi->class, myclass,
1195                                                                                                          &(curstack->prev->typeinfo)))
1196                                                                           panic("PUTFIELD: field is not accessible");
1197                                                           }
1198
1199                                                           if (curstack->type != fi->type)
1200                                                                   panic("PUTFIELD type mismatch");
1201                                                           if (fi->type == TYPE_ADR) {
1202                                                                   TYPEINFO_INIT_FROM_FIELDINFO(rinfo,fi);
1203                                                                   if (!typeinfo_is_assignable(&(curstack->typeinfo),
1204                                                                                                                           &rinfo))
1205                                                                           panic("PUTFIELD reference type not assignable");
1206                                                           }
1207                                                   }
1208                           maythrow = true;
1209                           break;
1210
1211                       case ICMD_PUTSTATIC:
1212                                                   TYPECHECK_COUNT(stat_ins_field);
1213                           /* check if the value is assignable to the field */
1214                                                   {
1215                                                           fieldinfo *fi = (fieldinfo*) iptr[0].val.a;
1216
1217                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,NULL))
1218                                                                   panic("PUTSTATIC: field is not accessible");
1219
1220                                                           if (curstack->type != fi->type)
1221                                                                   panic("PUTSTATIC type mismatch");
1222                                                           if (fi->type == TYPE_ADR) {
1223                                                                   TYPEINFO_INIT_FROM_FIELDINFO(rinfo,fi);
1224                                                                   if (!typeinfo_is_assignable(&(curstack->typeinfo),
1225                                                                                                                           &rinfo))
1226                                                                           panic("PUTSTATIC reference type not assignable");
1227                                                           }
1228                                                   }
1229                           maythrow = true;
1230                           break;
1231
1232                       case ICMD_GETFIELD:
1233                                                   TYPECHECK_COUNT(stat_ins_field);
1234                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1235                               panic("illegal instruction: GETFIELD on non-reference");
1236                           if (TYPEINFO_IS_ARRAY(curstack->typeinfo))
1237                               panic("illegal instruction: GETFIELD on array");
1238
1239                           {
1240                               fieldinfo *fi = (fieldinfo *)(iptr->val.a);
1241
1242                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,
1243                                                                                                  &(curstack->typeinfo)))
1244                                                                   panic("GETFIELD: field is not accessible");
1245
1246                               if (dst->type == TYPE_ADR) {
1247                                   TYPEINFO_INIT_FROM_FIELDINFO(dst->typeinfo,fi);
1248                               }
1249                           }
1250                           maythrow = true;
1251                           break;
1252
1253                       case ICMD_GETSTATIC:
1254                                                   TYPECHECK_COUNT(stat_ins_field);
1255                           {
1256                               fieldinfo *fi = (fieldinfo *)(iptr->val.a);
1257
1258                                                           if (!is_accessible(fi->flags,fi->class,fi->class,myclass,NULL)) {
1259                                                                 printf("---------\n");
1260                                                                   utf_display(fi->class->name);
1261                                                                 printf("\n");
1262                                                                   utf_display(myclass->name);
1263                                                                 printf("\n");
1264
1265
1266                                                                   panic("GETSTATIC: field is not accessible");
1267                                                         }
1268
1269                               if (dst->type == TYPE_ADR) {
1270                                   TYPEINFO_INIT_FROM_FIELDINFO(dst->typeinfo,fi);
1271                               }
1272                           }
1273                           maythrow = true;
1274                           break;
1275
1276                           /****************************************/
1277                           /* PRIMITIVE ARRAY ACCESS               */
1278
1279                       case ICMD_ARRAYLENGTH:
1280                           if (!TYPEINFO_MAYBE_ARRAY(curstack->typeinfo)
1281                                                           && curstack->typeinfo.typeclass != pseudo_class_Arraystub)
1282                               panic("illegal instruction: ARRAYLENGTH on non-array");
1283                           maythrow = true;
1284                           break;
1285
1286                       case ICMD_BALOAD:
1287                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_BOOLEAN)
1288                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_BYTE))
1289                               panic("Array type mismatch");
1290                           maythrow = true;
1291                           break;
1292                       case ICMD_CALOAD:
1293                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_CHAR))
1294                               panic("Array type mismatch");
1295                           maythrow = true;
1296                           break;
1297                       case ICMD_DALOAD:
1298                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_DOUBLE))
1299                               panic("Array type mismatch");
1300                           maythrow = true;
1301                           break;
1302                       case ICMD_FALOAD:
1303                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_FLOAT))
1304                               panic("Array type mismatch");
1305                           maythrow = true;
1306                           break;
1307                       case ICMD_IALOAD:
1308                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_INT))
1309                               panic("Array type mismatch");
1310                           maythrow = true;
1311                           break;
1312                       case ICMD_SALOAD:
1313                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_SHORT))
1314                               panic("Array type mismatch");
1315                           maythrow = true;
1316                           break;
1317                       case ICMD_LALOAD:
1318                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo,ARRAYTYPE_LONG))
1319                               panic("Array type mismatch");
1320                           maythrow = true;
1321                           break;
1322
1323                       case ICMD_BASTORE:
1324                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_BOOLEAN)
1325                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_BYTE))
1326                               panic("Array type mismatch");
1327                           maythrow = true;
1328                           break;
1329                       case ICMD_CASTORE:
1330                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_CHAR))
1331                               panic("Array type mismatch");
1332                           maythrow = true;
1333                           break;
1334                       case ICMD_DASTORE:
1335                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_DOUBLE))
1336                               panic("Array type mismatch");
1337                           maythrow = true;
1338                           break;
1339                       case ICMD_FASTORE:
1340                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_FLOAT))
1341                               panic("Array type mismatch");
1342                           maythrow = true;
1343                           break;
1344                       case ICMD_IASTORE:
1345                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_INT))
1346                               panic("Array type mismatch");
1347                           maythrow = true;
1348                           break;
1349                       case ICMD_SASTORE:
1350                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_SHORT))
1351                               panic("Array type mismatch");
1352                           maythrow = true;
1353                           break;
1354                       case ICMD_LASTORE:
1355                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->prev->typeinfo,ARRAYTYPE_LONG))
1356                               panic("Array type mismatch");
1357                           maythrow = true;
1358                           break;
1359
1360                       case ICMD_IASTORECONST:
1361                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_INT))
1362                               panic("Array type mismatch");
1363                           maythrow = true;
1364                           break;
1365
1366                       case ICMD_LASTORECONST:
1367                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_LONG))
1368                               panic("Array type mismatch");
1369                           maythrow = true;
1370                           break;
1371
1372                       case ICMD_BASTORECONST:
1373                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_BOOLEAN)
1374                               && !TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_BYTE))
1375                               panic("Array type mismatch");
1376                           maythrow = true;
1377                           break;
1378
1379                       case ICMD_CASTORECONST:
1380                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_CHAR))
1381                               panic("Array type mismatch");
1382                           maythrow = true;
1383                           break;
1384
1385                       case ICMD_SASTORECONST:
1386                           if (!TYPEINFO_MAYBE_PRIMITIVE_ARRAY(curstack->prev->typeinfo, ARRAYTYPE_SHORT))
1387                               panic("Array type mismatch");
1388                           maythrow = true;
1389                           break;
1390
1391
1392                           /****************************************/
1393                           /* ADDRESS CONSTANTS                    */
1394
1395                       case ICMD_ACONST:
1396                           if (iptr->val.a == NULL)
1397                               TYPEINFO_INIT_NULLTYPE(dst->typeinfo);
1398                           else
1399                               /* string constants (or constant for builtin function) */
1400                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,class_java_lang_String);
1401                           break;
1402
1403                           /****************************************/
1404                           /* CHECKCAST AND INSTANCEOF             */
1405
1406                       case ICMD_CHECKCAST:
1407                                                   TYPECHECK_ADR(curstack);
1408                           /* returnAddress is not allowed */
1409                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1410                               panic("Illegal instruction: CHECKCAST on non-reference");
1411
1412                           TYPEINFO_INIT_CLASSINFO(dst->typeinfo,(classinfo *)iptr[0].val.a);
1413                           maythrow = true;
1414                           break;
1415
1416                       case ICMD_INSTANCEOF:
1417                                                   TYPECHECK_ADR(curstack);
1418                           /* returnAddress is not allowed */
1419                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1420                               panic("Illegal instruction: INSTANCEOF on non-reference");
1421                           break;
1422
1423                           /****************************************/
1424                           /* BRANCH INSTRUCTIONS                  */
1425
1426                       case ICMD_GOTO:
1427                           superblockend = true;
1428                           /* FALLTHROUGH! */
1429                       case ICMD_IFNULL:
1430                       case ICMD_IFNONNULL:
1431                       case ICMD_IFEQ:
1432                       case ICMD_IFNE:
1433                       case ICMD_IFLT:
1434                       case ICMD_IFGE:
1435                       case ICMD_IFGT:
1436                       case ICMD_IFLE:
1437                       case ICMD_IF_ICMPEQ:
1438                       case ICMD_IF_ICMPNE:
1439                       case ICMD_IF_ICMPLT:
1440                       case ICMD_IF_ICMPGE:
1441                       case ICMD_IF_ICMPGT:
1442                       case ICMD_IF_ICMPLE:
1443                       case ICMD_IF_ACMPEQ:
1444                       case ICMD_IF_ACMPNE:
1445                       case ICMD_IF_LEQ:
1446                       case ICMD_IF_LNE:
1447                       case ICMD_IF_LLT:
1448                       case ICMD_IF_LGE:
1449                       case ICMD_IF_LGT:
1450                       case ICMD_IF_LLE:
1451                       case ICMD_IF_LCMPEQ:
1452                       case ICMD_IF_LCMPNE:
1453                       case ICMD_IF_LCMPLT:
1454                       case ICMD_IF_LCMPGE:
1455                       case ICMD_IF_LCMPGT:
1456                       case ICMD_IF_LCMPLE:
1457                                                   TYPECHECK_COUNT(stat_ins_branch);
1458                           tbptr = (basicblock *) iptr->target;
1459
1460                           /* propagate stack and variables to the target block */
1461                           TYPECHECK_REACH;
1462                           break;
1463
1464                           /****************************************/
1465                           /* SWITCHES                             */
1466
1467                       case ICMD_TABLESWITCH:
1468                                                   TYPECHECK_COUNT(stat_ins_switch);
1469                           {
1470                               s4 *s4ptr = iptr->val.a;
1471                               s4ptr++;              /* skip default */
1472                               i = *s4ptr++;         /* low */
1473                               i = *s4ptr++ - i + 2; /* +1 for default target */
1474                           }
1475                           goto switch_instruction_tail;
1476
1477                       case ICMD_LOOKUPSWITCH:
1478                                                   TYPECHECK_COUNT(stat_ins_switch);
1479                           {
1480                               s4 *s4ptr = iptr->val.a;
1481                               s4ptr++;              /* skip default */
1482                               i = *s4ptr++ + 1;     /* count +1 for default */
1483                           }
1484                     switch_instruction_tail:
1485                           tptr = (basicblock **)iptr->target;
1486
1487                           while (--i >= 0) {
1488                               tbptr = *tptr++;
1489                               LOG2("target %d is block %04d",(tptr-(basicblock **)iptr->target)-1,tbptr-block);
1490                               TYPECHECK_REACH;
1491                           }
1492                           LOG("switch done");
1493                           superblockend = true;
1494                           break;
1495
1496                           /****************************************/
1497                           /* RETURNS AND THROW                    */
1498
1499                       case ICMD_ATHROW:
1500                           if (!typeinfo_is_assignable_to_classinfo(
1501                                    &curstack->typeinfo,class_java_lang_Throwable))
1502                               panic("illegal instruction: ATHROW on non-Throwable");
1503                           superblockend = true;
1504                           maythrow = true;
1505                           break;
1506
1507                       case ICMD_ARETURN:
1508                           if (!TYPEINFO_IS_REFERENCE(curstack->typeinfo))
1509                               panic("illegal instruction: ARETURN on non-reference");
1510
1511                           if (returntype.type != TYPE_ADDRESS
1512                               || !typeinfo_is_assignable(&curstack->typeinfo,&(returntype.info)))
1513                               panic("Return type mismatch");
1514                                                   goto return_tail;
1515
1516                       case ICMD_IRETURN:
1517                           if (returntype.type != TYPE_INT) panic("Return type mismatch");
1518                                                   goto return_tail;
1519
1520                       case ICMD_LRETURN:
1521                           if (returntype.type != TYPE_LONG) panic("Return type mismatch");
1522                                                   goto return_tail;
1523
1524                       case ICMD_FRETURN:
1525                           if (returntype.type != TYPE_FLOAT) panic("Return type mismatch");
1526                                                   goto return_tail;
1527
1528                       case ICMD_DRETURN:
1529                           if (returntype.type != TYPE_DOUBLE) panic("Return type mismatch");
1530                                                   goto return_tail;
1531
1532                       case ICMD_RETURN:
1533                           if (returntype.type != TYPE_VOID) panic("Return type mismatch");
1534                                           return_tail:
1535                           TYPECHECK_LEAVE;
1536                           superblockend = true;
1537                           maythrow = true;
1538                           break;
1539
1540                           /****************************************/
1541                           /* SUBROUTINE INSTRUCTIONS              */
1542
1543                       case ICMD_JSR:
1544                           LOG("jsr");
1545                                                   jsrencountered = true;
1546
1547                           /* This is a dirty hack. It is needed
1548                            * because of the special handling of
1549                            * ICMD_JSR in stack.c
1550                            */
1551                           dst = (stackptr) iptr->val.a;
1552
1553                           tbptr = (basicblock *) iptr->target;
1554                                                   if (bptr + 1 == (m->basicblocks + m->basicblockcount + 1))
1555                                                           panic("Illegal instruction: JSR at end of bytecode");
1556                                                   typestack_put_retaddr(dst,bptr+1,localset);
1557                                                   repeat |= typestate_reach(cd, rd,localbuf,bptr,tbptr,dst,
1558                                                                                                         localset,numlocals,true);
1559
1560                                                   superblockend = true;
1561                           break;
1562
1563                       case ICMD_RET:
1564                           /* check returnAddress variable */
1565                                                   if (!typevectorset_checkretaddr(localset,iptr->op1))
1566                               panic("illegal instruction: RET using non-returnAddress variable");
1567
1568                                                   repeat |= typestate_ret(cd,rd, localbuf,bptr,curstack,
1569                                                                                                   localset,iptr->op1,numlocals);
1570
1571                           superblockend = true;
1572                           break;
1573
1574                           /****************************************/
1575                           /* INVOKATIONS                          */
1576
1577                       case ICMD_INVOKEVIRTUAL:
1578                       case ICMD_INVOKESPECIAL:
1579                       case ICMD_INVOKESTATIC:
1580                       case ICMD_INVOKEINTERFACE:
1581                                                   TYPECHECK_COUNT(stat_ins_invoke);
1582                           {
1583                               methodinfo *mi = (methodinfo*) iptr->val.a;
1584                                                           bool specialmethod = (mi->name->text[0] == '<');
1585                               bool callinginit = (opcode == ICMD_INVOKESPECIAL && mi->name == name_init);
1586                               instruction *ins;
1587                               classinfo *initclass;
1588
1589                                                           if (specialmethod && !callinginit)
1590                                                                   panic("Invalid invocation of special method");
1591
1592                                                           if (opcode == ICMD_INVOKESPECIAL) {
1593                                                                   /* XXX for INVOKESPECIAL: check if the invokation is done at all */
1594
1595                                                                   /* (If callinginit the class is checked later.) */
1596                                                                   if (!callinginit) {
1597                                                                           if (!builtin_isanysubclass(myclass,mi->class))
1598                                                                                   panic("Illegal instruction: INVOKESPECIAL calling non-superclass method");
1599                                                                   }
1600                                                           }
1601
1602                               /* fetch parameter types and return type */
1603                               i = 0;
1604                               if (opcode != ICMD_INVOKESTATIC) {
1605                                   ptype[0] = TYPE_ADR;
1606                                   TYPEINFO_INIT_CLASSINFO(pinfo[0],mi->class);
1607                                   i++;
1608                               }
1609                               typeinfo_init_from_method_args(mi->descriptor,ptype+i,pinfo+i,
1610                                                              MAXPARAMS-i,false,
1611                                                              &rtype,&rinfo);
1612
1613                               /* check parameter types */
1614                               srcstack = curstack;
1615                               i = mi->paramcount; /* number of parameters including 'this'*/
1616                               while (--i >= 0) {
1617                                   LOG1("param %d",i);
1618                                   if (srcstack->type != ptype[i])
1619                                       panic("Parameter type mismatch in method invocation");
1620                                   if (srcstack->type == TYPE_ADR) {
1621                                       LOGINFO(&(srcstack->typeinfo));
1622                                       LOGINFO(pinfo + i);
1623                                       if (i==0 && callinginit)
1624                                       {
1625                                           /* first argument to <init> method */
1626                                           if (!TYPEINFO_IS_NEWOBJECT(srcstack->typeinfo))
1627                                               panic("Calling <init> on initialized object");
1628
1629                                           /* get the address of the NEW instruction */
1630                                           LOGINFO(&(srcstack->typeinfo));
1631                                           ins = (instruction*)TYPEINFO_NEWOBJECT_INSTRUCTION(srcstack->typeinfo);
1632                                           initclass = (ins) ? (classinfo*)ins[-1].val.a : m->class;
1633                                           LOGSTR("class: "); LOGSTRu(initclass->name); LOGNL;
1634
1635                                                                                   /* check type */
1636                                                                                   /* (This is checked below.) */
1637 /*                                                                                TYPEINFO_INIT_CLASSINFO(tempinfo,initclass); */
1638 /*                                           if (!typeinfo_is_assignable(&tempinfo,pinfo+0)) */
1639 /*                                               panic("Parameter reference type mismatch in <init> invocation"); */
1640                                       }
1641                                       else {
1642                                           if (!typeinfo_is_assignable(&(srcstack->typeinfo),pinfo+i))
1643                                               panic("Parameter reference type mismatch in method invocation");
1644                                       }
1645                                   }
1646                                   LOG("ok");
1647
1648                                   if (i) srcstack = srcstack->prev;
1649                               }
1650
1651                                                           /* XXX We should resolve the method and pass its
1652                                                            * class as implementingclass to is_accessible. */
1653                                                           if (!is_accessible(mi->flags,mi->class,NULL, myclass,
1654                                                                                                  (opcode == ICMD_INVOKESTATIC) ? NULL
1655                                                                                                  : &(srcstack->typeinfo)))
1656                                                                   panic("Invoking unaccessible method");
1657
1658                                                           LOG("checking return type");
1659                               if (rtype != TYPE_VOID) {
1660                                   if (rtype != dst->type)
1661                                       panic("Return type mismatch in method invocation");
1662                                   TYPEINFO_COPY(rinfo,dst->typeinfo);
1663                               }
1664
1665                               if (callinginit) {
1666                                                                   LOG("replacing uninitialized object");
1667                                   /* replace uninitialized object type on stack */
1668                                   srcstack = dst;
1669                                   while (srcstack) {
1670                                       if (srcstack->type == TYPE_ADR
1671                                           && TYPEINFO_IS_NEWOBJECT(srcstack->typeinfo)
1672                                           && TYPEINFO_NEWOBJECT_INSTRUCTION(srcstack->typeinfo) == ins)
1673                                       {
1674                                           LOG("replacing uninitialized type on stack");
1675
1676                                                                                   /* If this stackslot is in the instack of
1677                                                                                    * this basic block we must save the type(s)
1678                                                                                    * we are going to replace.
1679                                                                                    */
1680                                                                                   if (srcstack <= bptr->instack && !savedstack)
1681                                                                                   {
1682                                                                                           stackptr sp;
1683                                                                                           stackptr copy;
1684                                                                                           LOG("saving input stack types");
1685                                                                                           if (!savedstackbuf) {
1686                                                                                                   LOG("allocating savedstack buffer");
1687                                                                                                   savedstackbuf = DMNEW(stackelement, cd->maxstack);
1688                                                                                                   savedstackbuf->prev = NULL;
1689                                                                                                   for (i = 1; i < cd->maxstack; ++i)
1690                                                                                                           savedstackbuf[i].prev = savedstackbuf+(i-1);
1691                                                                                           }
1692                                                                                           sp = savedstack = bptr->instack;
1693                                                                                           copy = bptr->instack = savedstackbuf + (bptr->indepth-1);
1694                                                                                           TYPESTACK_COPY(sp,copy);
1695                                                                                   }
1696
1697                                           TYPEINFO_INIT_CLASSINFO(srcstack->typeinfo,initclass);
1698                                       }
1699                                       srcstack = srcstack->prev;
1700                                   }
1701                                   /* replace uninitialized object type in locals */
1702                                                                   typevectorset_init_object(localset,ins,initclass,numlocals);
1703
1704                                   /* initializing the 'this' reference? */
1705                                   if (!ins) {
1706 #ifdef TYPECHECK_DEBUG
1707                                                                           if (!initmethod)
1708                                                                                   panic("Internal error: calling <init> on this in non-<init> method.");
1709 #endif
1710                                                                           /* must be <init> of current class or direct superclass */
1711                                                                           if (mi->class != m->class && mi->class != m->class->super)
1712                                                                                   panic("<init> calling <init> of the wrong class");
1713
1714                                       /* set our marker variable to type int */
1715                                       LOG("setting <init> marker");
1716                                                                           typevectorset_store(localset,numlocals-1,TYPE_INT,NULL);
1717                                   }
1718                                                                   else {
1719                                                                           /* initializing an instance created with NEW */
1720                                                                           /* XXX is this strictness ok? */
1721                                                                           if (mi->class != initclass)
1722                                                                                   panic("Calling <init> method of the wrong class");
1723                                                                   }
1724                               }
1725                           }
1726                           maythrow = true;
1727                           break;
1728
1729                       case ICMD_MULTIANEWARRAY:
1730                                                   {
1731                                                           vftbl_t *arrayvftbl;
1732                                                           arraydescriptor *desc;
1733
1734                                                           /* check the array lengths on the stack */
1735                                                           i = iptr[0].op1;
1736                                                           if (i<1) panic("MULTIANEWARRAY with dimensions < 1");
1737                                                           srcstack = curstack;
1738                                                           while (i--) {
1739                                                                   if (!srcstack)
1740                                                                           panic("MULTIANEWARRAY missing array length");
1741                                                                   if (srcstack->type != TYPE_INT)
1742                                                                           panic("MULTIANEWARRAY using non-int as array length");
1743                                                                   srcstack = srcstack->prev;
1744                                                           }
1745
1746                                                           /* check array descriptor */
1747                                                           arrayvftbl = (vftbl_t*) iptr[0].val.a;
1748                                                           if (!arrayvftbl)
1749                                                                   panic("MULTIANEWARRAY with unlinked class");
1750                                                           if ((desc = arrayvftbl->arraydesc) == NULL)
1751                                                                   panic("MULTIANEWARRAY with non-array class");
1752                                                           if (desc->dimension < iptr[0].op1)
1753                                                                   panic("MULTIANEWARRAY dimension to high");
1754
1755                                                           /* set the array type of the result */
1756                                                           TYPEINFO_INIT_CLASSINFO(dst->typeinfo,arrayvftbl->class);
1757                                                   }
1758                           maythrow = true;
1759                           break;
1760
1761                       case ICMD_BUILTIN3:
1762                                                   TYPECHECK_COUNT(stat_ins_builtin);
1763                           if (ISBUILTIN(BUILTIN_aastore)) {
1764                                                           TYPECHECK_ADR(curstack);
1765                                                           TYPECHECK_INT(curstack->prev);
1766                                                           TYPECHECK_ADR(curstack->prev->prev);
1767                               if (!TYPEINFO_MAYBE_ARRAY_OF_REFS(curstack->prev->prev->typeinfo))
1768                                   panic("illegal instruction: AASTORE to non-reference array");
1769                           }
1770                                                   else {
1771                                                           /* XXX put these checks in a function */
1772                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1773                                                           builtindesc = builtin_desc;
1774                                                           while (builtindesc->opcode && builtindesc->builtin
1775                                                                          != iptr->val.fp) builtindesc++;
1776                                                           if (!builtindesc->opcode) {
1777                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1778                                                                   panic("Internal error: builtin not found in table");
1779                                                           }
1780                                                           TYPECHECK_ARGS3(builtindesc->type_s3,builtindesc->type_s2,builtindesc->type_s1);
1781                                                   }
1782                           maythrow = true;
1783                           break;
1784
1785                       case ICMD_BUILTIN2:
1786                                                   TYPECHECK_COUNT(stat_ins_builtin);
1787                           if (ISBUILTIN(BUILTIN_newarray))
1788                           {
1789                                                           vftbl_t *vft;
1790                                                           TYPECHECK_INT(curstack->prev);
1791                               if (iptr[-1].opc != ICMD_ACONST)
1792                                   panic("illegal instruction: builtin_newarray without classinfo");
1793                                                           vft = (vftbl_t *)iptr[-1].val.a;
1794                                                           if (!vft)
1795                                                                   panic("ANEWARRAY with unlinked class");
1796                                                           if (!vft->arraydesc)
1797                                                                   panic("ANEWARRAY with non-array class");
1798                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,vft->class);
1799                           }
1800                           else if (ISBUILTIN(BUILTIN_arrayinstanceof))
1801                           {
1802                                                           vftbl_t *vft;
1803                                                           TYPECHECK_ADR(curstack->prev);
1804                               if (iptr[-1].opc != ICMD_ACONST)
1805                                   panic("illegal instruction: builtin_arrayinstanceof without classinfo");
1806                                                           vft = (vftbl_t *)iptr[-1].val.a;
1807                                                           if (!vft)
1808                                                                   panic("INSTANCEOF with unlinked class");
1809                                                           if (!vft->arraydesc)
1810                                                                   panic("internal error: builtin_arrayinstanceof with non-array class");
1811                                                   }
1812                           else if (ISBUILTIN(BUILTIN_checkarraycast)) {
1813                                                           vftbl_t *vft;
1814                                                           TYPECHECK_ADR(curstack->prev);
1815                               if (iptr[-1].opc != ICMD_ACONST)
1816                                   panic("illegal instruction: BUILTIN_checkarraycast without classinfo");
1817                                                           vft = (vftbl_t *)iptr[-1].val.a;
1818                                                           if (!vft)
1819                                                                   panic("CHECKCAST with unlinked class");
1820                                                           if (!vft->arraydesc)
1821                                                                   panic("internal error: builtin_checkarraycast with non-array class");
1822                               TYPEINFO_INIT_CLASSINFO(dst->typeinfo,vft->class);
1823                           }
1824                                                   else {
1825                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1826                                                           builtindesc = builtin_desc;
1827                                                           while (builtindesc->opcode && builtindesc->builtin
1828                                                                          != iptr->val.fp) builtindesc++;
1829                                                           if (!builtindesc->opcode) {
1830                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1831                                                                   panic("Internal error: builtin not found in table");
1832                                                           }
1833                                                           TYPECHECK_ARGS2(builtindesc->type_s2,builtindesc->type_s1);
1834                                                   }
1835                           maythrow = true;
1836                           break;
1837
1838                       case ICMD_BUILTIN1:
1839                                                   TYPECHECK_COUNT(stat_ins_builtin);
1840                           if (ISBUILTIN(BUILTIN_new)) {
1841
1842                               if (iptr[-1].opc != ICMD_ACONST)
1843                                   panic("illegal instruction: builtin_new without classinfo");
1844                                                           cls = (classinfo *) iptr[-1].val.a;
1845                                                           if (!cls->linked)
1846                                                                   panic("Internal error: NEW with unlinked class");
1847                                                           /* The following check also forbids array classes and interfaces: */
1848                                                           if ((cls->flags & ACC_ABSTRACT) != 0)
1849                                                                   panic("Invalid instruction: NEW creating instance of abstract class");
1850                               TYPEINFO_INIT_NEWOBJECT(dst->typeinfo,iptr);
1851                           }
1852                           else if (ISBUILTIN(BUILTIN_newarray_boolean)) {
1853                                                           TYPECHECK_INT(curstack);
1854                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_BOOLEAN);
1855                           }
1856                           else if (ISBUILTIN(BUILTIN_newarray_char)) {
1857                                                           TYPECHECK_INT(curstack);
1858                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_CHAR);
1859                           }
1860                           else if (ISBUILTIN(BUILTIN_newarray_float)) {
1861                                                           TYPECHECK_INT(curstack);
1862                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_FLOAT);
1863                           }
1864                           else if (ISBUILTIN(BUILTIN_newarray_double)) {
1865                                                           TYPECHECK_INT(curstack);
1866                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_DOUBLE);
1867                           }
1868                           else if (ISBUILTIN(BUILTIN_newarray_byte)) {
1869                                                           TYPECHECK_INT(curstack);
1870                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_BYTE);
1871                           }
1872                           else if (ISBUILTIN(BUILTIN_newarray_short)) {
1873                                                           TYPECHECK_INT(curstack);
1874                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_SHORT);
1875                           }
1876                           else if (ISBUILTIN(BUILTIN_newarray_int)) {
1877                                                           TYPECHECK_INT(curstack);
1878                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_INT);
1879                           }
1880                           else if (ISBUILTIN(BUILTIN_newarray_long)) {
1881                                                           TYPECHECK_INT(curstack);
1882                               TYPEINFO_INIT_PRIMITIVE_ARRAY(dst->typeinfo,ARRAYTYPE_LONG);
1883                           }
1884                                                   else {
1885                                                           TYPECHECK_COUNT(stat_ins_builtin_gen);
1886                                                           builtindesc = builtin_desc;
1887                                                           while (builtindesc->opcode && builtindesc->builtin
1888                                                                          != iptr->val.fp) builtindesc++;
1889                                                           if (!builtindesc->opcode) {
1890                                                                   dolog("Builtin not in table: %s",icmd_builtin_name(iptr->val.fp));
1891                                                                   panic("Internal error: builtin not found in table");
1892                                                           }
1893                                                           TYPECHECK_ARGS1(builtindesc->type_s1);
1894                                                   }
1895                           maythrow = true;
1896                           break;
1897
1898                           /****************************************/
1899                           /* SIMPLE EXCEPTION THROWING TESTS      */
1900
1901                       case ICMD_CHECKASIZE:
1902                                                   /* The argument to CHECKASIZE is typechecked by
1903                                                    * typechecking the array creation instructions. */
1904
1905                                                   /* FALLTHROUGH! */
1906                       case ICMD_NULLCHECKPOP:
1907                                                   /* NULLCHECKPOP just requires that the stack top
1908                                                    * is an address. This is checked in stack.c */
1909
1910                           maythrow = true;
1911                           break;
1912
1913                           /****************************************/
1914                           /* INSTRUCTIONS WHICH SHOULD HAVE BEEN  */
1915                           /* REPLACED BY OTHER OPCODES            */
1916
1917 #ifdef TYPECHECK_DEBUG
1918                       case ICMD_NEW:
1919                       case ICMD_NEWARRAY:
1920                       case ICMD_ANEWARRAY:
1921                       case ICMD_MONITORENTER:
1922                       case ICMD_MONITOREXIT:
1923                       case ICMD_AASTORE:
1924                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-instr));
1925                                                   LOG("Should have been converted to builtin function call.");
1926                           panic("Internal error: unexpected instruction encountered");
1927                           break;
1928
1929                       case ICMD_READONLY_ARG:
1930                       case ICMD_CLEAR_ARGREN:
1931                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-instr));
1932                                                   LOG("Should have been replaced in stack.c.");
1933                           panic("Internal error: unexpected pseudo instruction encountered");
1934                           break;
1935 #endif
1936
1937                           /****************************************/
1938                           /* UNCHECKED OPERATIONS                 */
1939
1940                                                   /*********************************************
1941                                                    * Instructions below...
1942                                                    *     *) don't operate on local variables,
1943                                                    *     *) don't operate on references,
1944                                                    *     *) don't operate on returnAddresses.
1945                                                    *
1946                                                    * (These instructions are typechecked in
1947                                                    *  analyse_stack.)
1948                                                    ********************************************/
1949
1950                           /* Instructions which may throw a runtime exception: */
1951
1952                       case ICMD_IDIV:
1953                       case ICMD_IREM:
1954                       case ICMD_LDIV:
1955                       case ICMD_LREM:
1956
1957                           maythrow = true;
1958                           break;
1959
1960                           /* Instructions which never throw a runtime exception: */
1961 #if defined(TYPECHECK_DEBUG) || defined(TYPECHECK_STATISTICS)
1962                       case ICMD_NOP:
1963                       case ICMD_POP:
1964                       case ICMD_POP2:
1965
1966                       case ICMD_ICONST:
1967                       case ICMD_LCONST:
1968                       case ICMD_FCONST:
1969                       case ICMD_DCONST:
1970
1971                       case ICMD_IFEQ_ICONST:
1972                       case ICMD_IFNE_ICONST:
1973                       case ICMD_IFLT_ICONST:
1974                       case ICMD_IFGE_ICONST:
1975                       case ICMD_IFGT_ICONST:
1976                       case ICMD_IFLE_ICONST:
1977                       case ICMD_ELSE_ICONST:
1978
1979                       case ICMD_IADD:
1980                       case ICMD_ISUB:
1981                       case ICMD_IMUL:
1982                       case ICMD_INEG:
1983                       case ICMD_IAND:
1984                       case ICMD_IOR:
1985                       case ICMD_IXOR:
1986                       case ICMD_ISHL:
1987                       case ICMD_ISHR:
1988                       case ICMD_IUSHR:
1989                       case ICMD_LADD:
1990                       case ICMD_LSUB:
1991                       case ICMD_LMUL:
1992                       case ICMD_LNEG:
1993                       case ICMD_LAND:
1994                       case ICMD_LOR:
1995                       case ICMD_LXOR:
1996                       case ICMD_LSHL:
1997                       case ICMD_LSHR:
1998                       case ICMD_LUSHR:
1999                       case ICMD_IREM0X10001:
2000                       case ICMD_LREM0X10001:
2001                       case ICMD_IDIVPOW2:
2002                       case ICMD_LDIVPOW2:
2003                       case ICMD_IADDCONST:
2004                       case ICMD_ISUBCONST:
2005                       case ICMD_IMULCONST:
2006                       case ICMD_IANDCONST:
2007                       case ICMD_IORCONST:
2008                       case ICMD_IXORCONST:
2009                       case ICMD_ISHLCONST:
2010                       case ICMD_ISHRCONST:
2011                       case ICMD_IUSHRCONST:
2012                       case ICMD_IREMPOW2:
2013                       case ICMD_LADDCONST:
2014                       case ICMD_LSUBCONST:
2015                       case ICMD_LMULCONST:
2016                       case ICMD_LANDCONST:
2017                       case ICMD_LORCONST:
2018                       case ICMD_LXORCONST:
2019                       case ICMD_LSHLCONST:
2020                       case ICMD_LSHRCONST:
2021                       case ICMD_LUSHRCONST:
2022                       case ICMD_LREMPOW2:
2023
2024                       case ICMD_I2L:
2025                       case ICMD_I2F:
2026                       case ICMD_I2D:
2027                       case ICMD_L2I:
2028                       case ICMD_L2F:
2029                       case ICMD_L2D:
2030                       case ICMD_F2I:
2031                       case ICMD_F2L:
2032                       case ICMD_F2D:
2033                       case ICMD_D2I:
2034                       case ICMD_D2L:
2035                       case ICMD_D2F:
2036                       case ICMD_INT2BYTE:
2037                       case ICMD_INT2CHAR:
2038                       case ICMD_INT2SHORT:
2039
2040                       case ICMD_LCMP:
2041                       case ICMD_LCMPCONST:
2042                       case ICMD_FCMPL:
2043                       case ICMD_FCMPG:
2044                       case ICMD_DCMPL:
2045                       case ICMD_DCMPG:
2046
2047                       case ICMD_FADD:
2048                       case ICMD_DADD:
2049                       case ICMD_FSUB:
2050                       case ICMD_DSUB:
2051                       case ICMD_FMUL:
2052                       case ICMD_DMUL:
2053                       case ICMD_FDIV:
2054                       case ICMD_DDIV:
2055                       case ICMD_FREM:
2056                       case ICMD_DREM:
2057                       case ICMD_FNEG:
2058                       case ICMD_DNEG:
2059
2060                                                   TYPECHECK_COUNT(stat_ins_unchecked);
2061                           break;
2062
2063                           /****************************************/
2064
2065                       default:
2066                           LOG2("ICMD %d at %d\n", iptr->opc, (int)(iptr-instr));
2067                           panic("Missing ICMD code during typecheck");
2068 #endif
2069                                         }
2070
2071                     /* the output of this instruction becomes the current stack */
2072                     curstack = dst;
2073
2074                     /* reach exception handlers for this instruction */
2075                     if (maythrow) {
2076                         LOG("reaching exception handlers");
2077                         i = 0;
2078                         while (handlers[i]) {
2079                                                         TYPECHECK_COUNT(stat_handlers_reached);
2080                                                         cls = handlers[i]->catchtype;
2081                                                         excstack.typeinfo.typeclass = (cls) ? cls
2082                                                                 : class_java_lang_Throwable;
2083                                                         repeat |= typestate_reach(cd,rd, localbuf,bptr,
2084                                                                                                           handlers[i]->handler,
2085                                                                                                           &excstack,localset,
2086                                                                                                           numlocals,
2087                                                                                                           jsrencountered);
2088                             i++;
2089                         }
2090                     }
2091
2092                     iptr++;
2093                 } /* while instructions */
2094
2095                 LOG("instructions done");
2096                 LOGSTR("RESULT=> ");
2097                 DOLOG(typestate_print(get_logfile(),curstack,localset,numlocals));
2098                 LOGNL; LOGFLUSH;
2099
2100                 /* propagate stack and variables to the following block */
2101                 if (!superblockend) {
2102                     LOG("reaching following block");
2103                     tbptr = bptr + 1;
2104                     while (tbptr->flags == BBDELETED) {
2105                         tbptr++;
2106 #ifdef TYPECHECK_DEBUG
2107                         if ((tbptr-block) >= m->basicblockcount)
2108                             panic("Control flow falls off the last block");
2109 #endif
2110                     }
2111                     TYPECHECK_REACH;
2112                 }
2113
2114                                 /* We may have to restore the types of the instack slots. They
2115                                  * have been saved if an <init> call inside the block has
2116                                  * modified the instack types. (see INVOKESPECIAL) */
2117
2118                                 if (savedstack) {
2119                                         stackptr sp = bptr->instack;
2120                                         stackptr copy = savedstack;
2121                                         TYPECHECK_COUNT(stat_savedstack);
2122                                         LOG("restoring saved instack");
2123                                         TYPESTACK_COPY(sp,copy);
2124                                         bptr->instack = savedstack;
2125                                         savedstack = NULL;
2126                                 }
2127
2128             } /* if block has to be checked */
2129             bptr++;
2130         } /* while blocks */
2131
2132         LOGIF(repeat,"repeat=true");
2133     } while (repeat);
2134
2135 #ifdef TYPECHECK_STATISTICS
2136         dolog("Typechecker did %4d iterations",count_iterations);
2137         TYPECHECK_COUNT_FREQ(stat_iterations,count_iterations,STAT_ITERATIONS);
2138         TYPECHECK_COUNTIF(jsrencountered,stat_typechecked_jsr);
2139 #endif
2140
2141 #ifdef TYPECHECK_DEBUG
2142         for (i=0; i<m->basicblockcount; ++i) {
2143                 if (m->basicblocks[i].flags != BBDELETED
2144                         && m->basicblocks[i].flags != BBUNDEF
2145                         && m->basicblocks[i].flags != BBFINISHED
2146                         && m->basicblocks[i].flags != BBTYPECHECK_UNDEF) /* typecheck may never reach
2147                                                                                                          * some exception handlers,
2148                                                                                                          * that's ok. */
2149                 {
2150                         LOG2("block L%03d has invalid flags after typecheck: %d",
2151                                  m->basicblocks[i].debug_nr,m->basicblocks[i].flags);
2152                         panic("Invalid block flags after typecheck");
2153                 }
2154         }
2155 #endif
2156
2157         /* Reset blocks we never reached */
2158         for (i=0; i<m->basicblockcount; ++i) {
2159                 if (m->basicblocks[i].flags == BBTYPECHECK_UNDEF)
2160                         m->basicblocks[i].flags = BBFINISHED;
2161         }
2162
2163     LOGimp("exiting typecheck");
2164
2165         /* just return methodinfo* to signal everything was ok */
2166
2167         return m;
2168 }
2169
2170 #undef COPYTYPE
2171
2172 #endif /* CACAO_TYPECHECK */
2173
2174 /*
2175  * These are local overrides for various environment variables in Emacs.
2176  * Please do not remove this and leave it at the end of the file, where
2177  * Emacs will automagically detect them.
2178  * ---------------------------------------------------------------------
2179  * Local variables:
2180  * mode: c
2181  * indent-tabs-mode: t
2182  * c-basic-offset: 4
2183  * tab-width: 4
2184  * End:
2185  */