debugger/expr.c

   1 /*
   2  * File expr.c - expression handling for Wine internal debugger.
   3  *
   4  * Copyright (C) 1997, Eric Youngdale.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include "winbase.h"
  25 #include "wine/winbase16.h"
  26 #include "debugger.h"
  27 #include "expr.h"
  28
  29 #include <stdarg.h>
  30
  31 struct expr
  32 {
  33   unsigned int  perm;
  34   unsigned int  type:31;
  35   union
  36   {
  37     struct
  38     {
  39       int value;
  40     } constant;
  41
  42     struct
  43     {
  44       const char * str;
  45     } string;
  46
  47     struct
  48     {
  49       unsigned int value;
  50     } u_const;
  51
  52     struct
  53     {
  54       const char * name;
  55     } symbol;
  56
  57     struct
  58     {
  59       const char * name;
  60     } intvar;
  61
  62     struct
  63     {
  64       int unop_type;
  65       struct expr * exp1;
  66       int             result;
  67     } unop;
  68
  69     struct
  70     {
  71       int binop_type;
  72       int result;
  73       struct expr * exp1;
  74       struct expr * exp2;
  75     } binop;
  76
  77     struct
  78     {
  79       struct datatype * cast;
  80       struct expr     * expr;
  81     } cast;
  82
  83     struct
  84     {
  85       struct expr * exp1;
  86       const char * element_name;
  87       int result;
  88     } structure;
  89
  90     struct
  91     {
  92       struct expr * base;
  93       struct expr * index;
  94     } array;
  95
  96     struct
  97     {
  98       const char  * funcname;
  99       int           nargs;
 100       int           result;
 101       struct expr * arg[5];
 102     } call;
 103
 104   } un;
 105 };
 106
 107 #define EXPR_TYPE_CONST         0
 108 #define EXPR_TYPE_US_CONST      1
 109 #define EXPR_TYPE_SYMBOL        2
 110 #define EXPR_TYPE_INTVAR        3
 111 #define EXPR_TYPE_BINOP         4
 112 #define EXPR_TYPE_UNOP          5
 113 #define EXPR_TYPE_STRUCT        6
 114 #define EXPR_TYPE_PSTRUCT       7
 115 #define EXPR_TYPE_ARRAY         8
 116 #define EXPR_TYPE_CALL          9
 117 #define EXPR_TYPE_STRING        10
 118 #define EXPR_TYPE_CAST          11
 119
 120 static char expr_list[4096];
 121 static unsigned int next_expr_free = 0;
 122
 123 /*
 124  * This is how we turn an expression address into the actual value.
 125  * This works well in the 32 bit domain - not sure at all about the
 126  * 16 bit world.
 127  */
 128 #define VAL(_exp)       DEBUG_GetExprValue(&_exp, NULL)
 129
 130 static
 131 struct expr *
 132 DEBUG_GetFreeExpr(void)
 133 {
 134   struct expr * rtn;
 135
 136   rtn =  (struct expr *) &expr_list[next_expr_free];
 137
 138   next_expr_free += sizeof(struct expr);
 139   assert(next_expr_free < sizeof(expr_list));
 140
 141   return rtn;
 142 }
 143
 144 void
 145 DEBUG_FreeExprMem(void)
 146 {
 147   next_expr_free = 0;
 148 }
 149
 150 struct expr *
 151 DEBUG_TypeCastExpr(struct datatype * dt, struct expr * exp)
 152 {
 153   struct expr * ex;
 154
 155   ex = DEBUG_GetFreeExpr();
 156
 157   ex->type        = EXPR_TYPE_CAST;
 158   ex->un.cast.cast = dt;
 159   ex->un.cast.expr = exp;
 160   return ex;
 161 }
 162
 163 struct expr *
 164 DEBUG_IntVarExpr(const char* name)
 165 {
 166   struct expr * ex;
 167
 168   ex = DEBUG_GetFreeExpr();
 169
 170   ex->type        = EXPR_TYPE_INTVAR;
 171   ex->un.intvar.name = name;
 172   return ex;
 173 }
 174
 175 struct expr *
 176 DEBUG_SymbolExpr(const char * name)
 177 {
 178   struct expr * ex;
 179
 180   ex = DEBUG_GetFreeExpr();
 181
 182   ex->type        = EXPR_TYPE_SYMBOL;
 183   ex->un.symbol.name = name;
 184   return ex;
 185 }
 186
 187 struct expr *
 188 DEBUG_ConstExpr(int value)
 189 {
 190   struct expr * ex;
 191
 192   ex = DEBUG_GetFreeExpr();
 193
 194   ex->type        = EXPR_TYPE_CONST;
 195   ex->un.constant.value = value;
 196   return ex;
 197 }
 198
 199 struct expr *
 200 DEBUG_StringExpr(const char * str)
 201 {
 202   struct expr * ex;
 203   char * pnt;
 204   ex = DEBUG_GetFreeExpr();
 205
 206   ex->type        = EXPR_TYPE_STRING;
 207   ex->un.string.str = str+1;
 208   pnt = strrchr(ex->un.string.str, '"');
 209   if( pnt != NULL )
 210     {
 211       *pnt =  '\0';
 212     }
 213   return ex;
 214 }
 215
 216 struct expr *
 217 DEBUG_USConstExpr(unsigned int value)
 218 {
 219   struct expr * ex;
 220
 221   ex = DEBUG_GetFreeExpr();
 222
 223   ex->type           = EXPR_TYPE_CONST;
 224   ex->un.u_const.value = value;
 225   return ex;
 226 }
 227
 228 struct expr *
 229 DEBUG_BinopExpr(int operator_type, struct expr * exp1, struct expr * exp2)
 230 {
 231   struct expr * ex;
 232
 233   ex = DEBUG_GetFreeExpr();
 234
 235   ex->type           = EXPR_TYPE_BINOP;
 236   ex->un.binop.binop_type = operator_type;
 237   ex->un.binop.exp1     = exp1;
 238   ex->un.binop.exp2     = exp2;
 239   return ex;
 240 }
 241
 242 struct expr *
 243 DEBUG_UnopExpr(int operator_type, struct expr * exp1)
 244 {
 245   struct expr * ex;
 246
 247   ex = DEBUG_GetFreeExpr();
 248
 249   ex->type           = EXPR_TYPE_UNOP;
 250   ex->un.unop.unop_type = operator_type;
 251   ex->un.unop.exp1      = exp1;
 252   return ex;
 253 }
 254
 255 struct expr *
 256 DEBUG_StructExpr(struct expr * exp, const char * element)
 257 {
 258   struct expr * ex;
 259
 260   ex = DEBUG_GetFreeExpr();
 261
 262   ex->type           = EXPR_TYPE_STRUCT;
 263   ex->un.structure.exp1 = exp;
 264   ex->un.structure.element_name = element;
 265   return ex;
 266 }
 267
 268 struct expr *
 269 DEBUG_StructPExpr(struct expr * exp, const char * element)
 270 {
 271   struct expr * ex;
 272
 273   ex = DEBUG_GetFreeExpr();
 274
 275   ex->type           = EXPR_TYPE_PSTRUCT;
 276   ex->un.structure.exp1 = exp;
 277   ex->un.structure.element_name = element;
 278   return ex;
 279 }
 280
 281 struct expr *
 282 DEBUG_CallExpr(const char * funcname, int nargs, ...)
 283 {
 284   struct expr * ex;
 285   va_list ap;
 286   int i;
 287
 288   ex = DEBUG_GetFreeExpr();
 289
 290   ex->type           = EXPR_TYPE_CALL;
 291   ex->un.call.funcname = funcname;
 292   ex->un.call.nargs = nargs;
 293
 294   va_start(ap, nargs);
 295   for(i=0; i < nargs; i++)
 296     {
 297       ex->un.call.arg[i] = va_arg(ap, struct expr *);
 298     }
 299   va_end(ap);
 300   return ex;
 301 }
 302
 303 DBG_VALUE DEBUG_EvalExpr(struct expr * exp)
 304 {
 305   DBG_VALUE     rtn;
 306   int           i;
 307   DBG_VALUE     exp1;
 308   DBG_VALUE     exp2;
 309   unsigned int  cexp[5];
 310   int               scale1;
 311   int               scale2;
 312   int               scale3;
 313   struct datatype * type1;
 314   struct datatype * type2;
 315
 316   rtn.type = NULL;
 317   rtn.cookie = DV_INVALID;
 318   rtn.addr.off = 0;
 319   rtn.addr.seg = 0;
 320
 321   switch(exp->type)
 322     {
 323     case EXPR_TYPE_CAST:
 324       rtn = DEBUG_EvalExpr(exp->un.cast.expr);
 325       rtn.type = exp->un.cast.cast;
 326       if (DEBUG_GetType(rtn.type) == DT_POINTER)
 327          rtn.cookie = DV_TARGET;
 328       break;
 329     case EXPR_TYPE_STRING:
 330       rtn.type = DEBUG_GetBasicType(DT_BASIC_STRING);
 331       rtn.cookie = DV_HOST;
 332       rtn.addr.off = (unsigned int) &exp->un.string.str;
 333       rtn.addr.seg = 0;
 334       break;
 335     case EXPR_TYPE_CONST:
 336       rtn.type = DEBUG_GetBasicType(DT_BASIC_CONST_INT);
 337       rtn.cookie = DV_HOST;
 338       rtn.addr.off = (unsigned int) &exp->un.constant.value;
 339       rtn.addr.seg = 0;
 340       break;
 341     case EXPR_TYPE_US_CONST:
 342       rtn.type = DEBUG_GetBasicType(DT_BASIC_USHORTINT);
 343       rtn.cookie = DV_HOST;
 344       rtn.addr.off = (unsigned int) &exp->un.u_const.value;
 345       rtn.addr.seg = 0;
 346       break;
 347     case EXPR_TYPE_SYMBOL:
 348       if( !DEBUG_GetSymbolValue(exp->un.symbol.name, -1, &rtn, FALSE) )
 349       {
 350           DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.symbol.name);
 351           RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 352       }
 353       break;
 354     case EXPR_TYPE_PSTRUCT:
 355       exp1 =  DEBUG_EvalExpr(exp->un.structure.exp1);
 356       if( exp1.type == NULL )
 357         {
 358            RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 359         }
 360       rtn.cookie = DV_TARGET;
 361       rtn.addr.off = DEBUG_TypeDerefPointer(&exp1, &rtn.type);
 362       if( rtn.type == NULL )
 363         {
 364           RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 365         }
 366       if (!DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
 367                                    &exp->un.structure.result))
 368       {
 369           DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.structure.element_name);
 370           RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
 371       }
 372
 373       break;
 374     case EXPR_TYPE_STRUCT:
 375       exp1 =  DEBUG_EvalExpr(exp->un.structure.exp1);
 376       if( exp1.type == NULL )
 377       {
 378           RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 379       }
 380       rtn = exp1;
 381       if (!DEBUG_FindStructElement(&rtn, exp->un.structure.element_name,
 382                                    &exp->un.structure.result))
 383       {
 384           DEBUG_Printf(DBG_CHN_MESG, "%s\n", exp->un.structure.element_name);
 385           RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
 386       }
 387       break;
 388     case EXPR_TYPE_CALL:
 389       /*
 390        * First, evaluate all of the arguments.  If any of them are not
 391        * evaluable, then bail.
 392        */
 393       for(i=0; i < exp->un.call.nargs; i++)
 394         {
 395           exp1  = DEBUG_EvalExpr(exp->un.call.arg[i]);
 396           if( exp1.type == NULL )
 397             {
 398               return rtn;
 399             }
 400           cexp[i] = DEBUG_GetExprValue(&exp1, NULL);
 401         }
 402
 403       /*
 404        * Now look up the address of the function itself.
 405        */
 406       if( !DEBUG_GetSymbolValue(exp->un.call.funcname, -1, &rtn, FALSE ) )
 407         {
 408           RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 409         }
 410
 411 #if 0
 412       /* FIXME: NEWDBG NIY */
 413       /* Anyway, I wonder how this could work depending on the calling order of
 414        * the function (cdecl vs pascal for example)
 415        */
 416       int               (*fptr)();
 417
 418       fptr = (int (*)()) rtn.addr.off;
 419       switch(exp->un.call.nargs)
 420         {
 421         case 0:
 422           exp->un.call.result = (*fptr)();
 423           break;
 424         case 1:
 425           exp->un.call.result = (*fptr)(cexp[0]);
 426           break;
 427         case 2:
 428           exp->un.call.result = (*fptr)(cexp[0], cexp[1]);
 429           break;
 430         case 3:
 431           exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2]);
 432           break;
 433         case 4:
 434           exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3]);
 435           break;
 436         case 5:
 437           exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3], cexp[4]);
 438           break;
 439         }
 440 #else
 441       DEBUG_Printf(DBG_CHN_MESG, "Function call no longer implemented\n");
 442       /* would need to set up a call to this function, and then restore the current
 443        * context afterwards...
 444        */
 445       exp->un.call.result = 0;
 446 #endif
 447       rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
 448       rtn.cookie = DV_HOST;
 449       rtn.addr.off = (unsigned int) &exp->un.call.result;
 450
 451       break;
 452     case EXPR_TYPE_INTVAR:
 453       {
 454
 455          DBG_INTVAR*    div = DEBUG_GetIntVar(exp->un.intvar.name);
 456
 457          if (!div) RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 458          rtn.cookie = DV_HOST;
 459          rtn.type = div->type;
 460          rtn.addr.off = (unsigned int)div->pval;
 461          /* EPP FIXME rtn.addr.seg = ?? */
 462       }
 463       break;
 464     case EXPR_TYPE_BINOP:
 465       exp1 = DEBUG_EvalExpr(exp->un.binop.exp1);
 466       exp2 = DEBUG_EvalExpr(exp->un.binop.exp2);
 467       rtn.cookie = DV_HOST;
 468       if( exp1.type == NULL || exp2.type == NULL )
 469         {
 470           RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 471         }
 472       if( exp1.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) &&
 473           exp2.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) )
 474         {
 475           rtn.type = exp1.type;
 476         }
 477       else
 478         {
 479           rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
 480         }
 481       rtn.addr.seg = 0;
 482       rtn.addr.off = (unsigned int) &exp->un.binop.result;
 483       switch(exp->un.binop.binop_type)
 484         {
 485         case EXP_OP_ADD:
 486           type1 = DEBUG_GetPointerType(exp1.type);
 487           type2 = DEBUG_GetPointerType(exp2.type);
 488           scale1 = 1;
 489           scale2 = 1;
 490           if( type1 != NULL && type2 != NULL )
 491             {
 492               RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 493             }
 494           else if( type1 != NULL )
 495             {
 496               scale2 = DEBUG_GetObjectSize(type1);
 497               rtn.type = exp1.type;
 498             }
 499           else if( type2 != NULL )
 500             {
 501               scale1 = DEBUG_GetObjectSize(type2);
 502               rtn.type = exp2.type;
 503             }
 504           exp->un.binop.result = (VAL(exp1) * scale1  + scale2 * VAL(exp2));
 505           break;
 506         case EXP_OP_SUB:
 507           type1 = DEBUG_GetPointerType(exp1.type);
 508           type2 = DEBUG_GetPointerType(exp2.type);
 509           scale1 = 1;
 510           scale2 = 1;
 511           scale3 = 1;
 512           if( type1 != NULL && type2 != NULL )
 513             {
 514               if( type1 != type2 )
 515                 {
 516                   RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 517                 }
 518               scale3 = DEBUG_GetObjectSize(type1);
 519             }
 520           else if( type1 != NULL )
 521             {
 522               scale2 = DEBUG_GetObjectSize(type1);
 523               rtn.type = exp1.type;
 524             }
 525
 526           else if( type2 != NULL )
 527             {
 528               scale1 = DEBUG_GetObjectSize(type2);
 529               rtn.type = exp2.type;
 530             }
 531           exp->un.binop.result = (VAL(exp1) - VAL(exp2)) / scale3;
 532           break;
 533         case EXP_OP_SEG:
 534           rtn.cookie = DV_TARGET;
 535           rtn.type = NULL;
 536           rtn.addr.seg = VAL(exp1);
 537           rtn.addr.off = VAL(exp2);
 538           break;
 539         case EXP_OP_LOR:
 540           exp->un.binop.result = (VAL(exp1) || VAL(exp2));
 541           break;
 542         case EXP_OP_LAND:
 543           exp->un.binop.result = (VAL(exp1) && VAL(exp2));
 544           break;
 545         case EXP_OP_OR:
 546           exp->un.binop.result = (VAL(exp1) | VAL(exp2));
 547           break;
 548         case EXP_OP_AND:
 549           exp->un.binop.result = (VAL(exp1) & VAL(exp2));
 550           break;
 551         case EXP_OP_XOR:
 552           exp->un.binop.result = (VAL(exp1) ^ VAL(exp2));
 553           break;
 554         case EXP_OP_EQ:
 555           exp->un.binop.result = (VAL(exp1) == VAL(exp2));
 556           break;
 557         case EXP_OP_GT:
 558           exp->un.binop.result = (VAL(exp1) > VAL(exp2));
 559           break;
 560         case EXP_OP_LT:
 561           exp->un.binop.result = (VAL(exp1) < VAL(exp2));
 562           break;
 563         case EXP_OP_GE:
 564           exp->un.binop.result = (VAL(exp1) >= VAL(exp2));
 565           break;
 566         case EXP_OP_LE:
 567           exp->un.binop.result = (VAL(exp1) <= VAL(exp2));
 568           break;
 569         case EXP_OP_NE:
 570           exp->un.binop.result = (VAL(exp1) != VAL(exp2));
 571           break;
 572         case EXP_OP_SHL:
 573           exp->un.binop.result = ((unsigned) VAL(exp1) << VAL(exp2));
 574           break;
 575         case EXP_OP_SHR:
 576           exp->un.binop.result = ((unsigned) VAL(exp1) >> VAL(exp2));
 577           break;
 578         case EXP_OP_MUL:
 579           exp->un.binop.result = (VAL(exp1) * VAL(exp2));
 580           break;
 581         case EXP_OP_DIV:
 582           if( VAL(exp2) == 0 )
 583             {
 584                RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
 585             }
 586           exp->un.binop.result = (VAL(exp1) / VAL(exp2));
 587           break;
 588         case EXP_OP_REM:
 589           if( VAL(exp2) == 0 )
 590             {
 591                RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
 592             }
 593           exp->un.binop.result = (VAL(exp1) % VAL(exp2));
 594           break;
 595         case EXP_OP_ARR:
 596           DEBUG_ArrayIndex(&exp1, &rtn, VAL(exp2));
 597           break;
 598         default:
 599           RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 600           break;
 601         }
 602       break;
 603     case EXPR_TYPE_UNOP:
 604       exp1 = DEBUG_EvalExpr(exp->un.unop.exp1);
 605       rtn.cookie = DV_HOST;
 606       if( exp1.type == NULL )
 607         {
 608           RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 609         }
 610       rtn.addr.seg = 0;
 611       rtn.addr.off = (unsigned int) &exp->un.unop.result;
 612       if( exp1.type == DEBUG_GetBasicType(DT_BASIC_CONST_INT) )
 613         {
 614           rtn.type = exp1.type;
 615         }
 616       else
 617         {
 618           rtn.type = DEBUG_GetBasicType(DT_BASIC_INT);
 619         }
 620       switch(exp->un.unop.unop_type)
 621         {
 622         case EXP_OP_NEG:
 623           exp->un.unop.result = -VAL(exp1);
 624           break;
 625         case EXP_OP_NOT:
 626           exp->un.unop.result = !VAL(exp1);
 627           break;
 628         case EXP_OP_LNOT:
 629           exp->un.unop.result = ~VAL(exp1);
 630           break;
 631         case EXP_OP_DEREF:
 632           /* FIXME: this is currently buggy.
 633            * there is no way to tell were the deref:ed value is...
 634            * for example:
 635            *    x is a pointer to struct s, x being on the stack
 636            *            => exp1 is target, result is target
 637            *    x is a pointer to struct s, x being optimized into a reg
 638            *            => exp1 is host, result is target
 639            *    x is a pointer to internal variable x
 640            *            => exp1 is host, result is host
 641            * so we force DV_TARGET, because dereferencing pointers to
 642            * internal variables is very unlikely. a correct fix would be
 643            * rather large.
 644            */
 645           rtn.cookie = DV_TARGET;
 646           rtn.addr.off = (unsigned int) DEBUG_TypeDerefPointer(&exp1, &rtn.type);
 647           if (!rtn.type)
 648             {
 649               RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 650             }
 651           break;
 652         case EXP_OP_FORCE_DEREF:
 653           rtn.cookie = exp1.cookie;
 654           rtn.addr.seg = exp1.addr.seg;
 655           if (exp1.cookie == DV_TARGET)
 656              DEBUG_READ_MEM((void*)exp1.addr.off, &rtn.addr.off, sizeof(rtn.addr.off));
 657           else
 658              memcpy(&rtn.addr.off, (void*)exp1.addr.off, sizeof(rtn.addr.off));
 659           break;
 660         case EXP_OP_ADDR:
 661           /* FIXME: even for a 16 bit entity ? */
 662           rtn.type = DEBUG_FindOrMakePointerType(exp1.type);
 663           exp->un.unop.result = exp1.addr.off;
 664           break;
 665         default:
 666            RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 667         }
 668       break;
 669     default:
 670       DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression (%d).\n", exp->type);
 671       RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 672       break;
 673     }
 674
 675   assert(rtn.cookie == DV_TARGET || rtn.cookie == DV_HOST);
 676
 677   return rtn;
 678 }
 679
 680
 681 int
 682 DEBUG_DisplayExpr(const struct expr * exp)
 683 {
 684   int           i;
 685
 686   switch(exp->type)
 687     {
 688     case EXPR_TYPE_CAST:
 689       DEBUG_Printf(DBG_CHN_MESG, "((");
 690       DEBUG_PrintTypeCast(exp->un.cast.cast);
 691       DEBUG_Printf(DBG_CHN_MESG, ")");
 692       DEBUG_DisplayExpr(exp->un.cast.expr);
 693       DEBUG_Printf(DBG_CHN_MESG, ")");
 694       break;
 695     case EXPR_TYPE_INTVAR:
 696       DEBUG_Printf(DBG_CHN_MESG, "$%s", exp->un.intvar.name);
 697       break;
 698     case EXPR_TYPE_US_CONST:
 699       DEBUG_Printf(DBG_CHN_MESG, "%ud", exp->un.u_const.value);
 700       break;
 701     case EXPR_TYPE_CONST:
 702       DEBUG_Printf(DBG_CHN_MESG, "%d", exp->un.u_const.value);
 703       break;
 704     case EXPR_TYPE_STRING:
 705       DEBUG_Printf(DBG_CHN_MESG, "\"%s\"", exp->un.string.str);
 706       break;
 707     case EXPR_TYPE_SYMBOL:
 708       DEBUG_Printf(DBG_CHN_MESG, "%s" , exp->un.symbol.name);
 709       break;
 710     case EXPR_TYPE_PSTRUCT:
 711       DEBUG_DisplayExpr(exp->un.structure.exp1);
 712       DEBUG_Printf(DBG_CHN_MESG, "->%s", exp->un.structure.element_name);
 713       break;
 714     case EXPR_TYPE_STRUCT:
 715       DEBUG_DisplayExpr(exp->un.structure.exp1);
 716       DEBUG_Printf(DBG_CHN_MESG, ".%s", exp->un.structure.element_name);
 717       break;
 718     case EXPR_TYPE_CALL:
 719       DEBUG_Printf(DBG_CHN_MESG, "%s(",exp->un.call.funcname);
 720       for(i=0; i < exp->un.call.nargs; i++)
 721         {
 722           DEBUG_DisplayExpr(exp->un.call.arg[i]);
 723           if( i != exp->un.call.nargs - 1 )
 724             {
 725               DEBUG_Printf(DBG_CHN_MESG, ", ");
 726             }
 727         }
 728       DEBUG_Printf(DBG_CHN_MESG, ")");
 729       break;
 730     case EXPR_TYPE_BINOP:
 731       DEBUG_Printf(DBG_CHN_MESG, "( ");
 732       DEBUG_DisplayExpr(exp->un.binop.exp1);
 733       switch(exp->un.binop.binop_type)
 734         {
 735         case EXP_OP_ADD:
 736           DEBUG_Printf(DBG_CHN_MESG, " + ");
 737           break;
 738         case EXP_OP_SUB:
 739           DEBUG_Printf(DBG_CHN_MESG, " - ");
 740           break;
 741         case EXP_OP_SEG:
 742           DEBUG_Printf(DBG_CHN_MESG, ":");
 743           break;
 744         case EXP_OP_LOR:
 745           DEBUG_Printf(DBG_CHN_MESG, " || ");
 746           break;
 747         case EXP_OP_LAND:
 748           DEBUG_Printf(DBG_CHN_MESG, " && ");
 749           break;
 750         case EXP_OP_OR:
 751           DEBUG_Printf(DBG_CHN_MESG, " | ");
 752           break;
 753         case EXP_OP_AND:
 754           DEBUG_Printf(DBG_CHN_MESG, " & ");
 755           break;
 756         case EXP_OP_XOR:
 757           DEBUG_Printf(DBG_CHN_MESG, " ^ ");
 758           break;
 759         case EXP_OP_EQ:
 760           DEBUG_Printf(DBG_CHN_MESG, " == ");
 761           break;
 762         case EXP_OP_GT:
 763           DEBUG_Printf(DBG_CHN_MESG, " > ");
 764           break;
 765         case EXP_OP_LT:
 766           DEBUG_Printf(DBG_CHN_MESG, " < ");
 767           break;
 768         case EXP_OP_GE:
 769           DEBUG_Printf(DBG_CHN_MESG, " >= ");
 770           break;
 771         case EXP_OP_LE:
 772           DEBUG_Printf(DBG_CHN_MESG, " <= ");
 773           break;
 774         case EXP_OP_NE:
 775           DEBUG_Printf(DBG_CHN_MESG, " != ");
 776           break;
 777         case EXP_OP_SHL:
 778           DEBUG_Printf(DBG_CHN_MESG, " << ");
 779           break;
 780         case EXP_OP_SHR:
 781           DEBUG_Printf(DBG_CHN_MESG, " >> ");
 782           break;
 783         case EXP_OP_MUL:
 784           DEBUG_Printf(DBG_CHN_MESG, " * ");
 785           break;
 786         case EXP_OP_DIV:
 787           DEBUG_Printf(DBG_CHN_MESG, " / ");
 788           break;
 789         case EXP_OP_REM:
 790           DEBUG_Printf(DBG_CHN_MESG, " %% ");
 791           break;
 792         case EXP_OP_ARR:
 793           DEBUG_Printf(DBG_CHN_MESG, "[");
 794           break;
 795         default:
 796           break;
 797         }
 798       DEBUG_DisplayExpr(exp->un.binop.exp2);
 799       if( exp->un.binop.binop_type == EXP_OP_ARR )
 800         {
 801           DEBUG_Printf(DBG_CHN_MESG, "]");
 802         }
 803       DEBUG_Printf(DBG_CHN_MESG, " )");
 804       break;
 805     case EXPR_TYPE_UNOP:
 806       switch(exp->un.unop.unop_type)
 807         {
 808         case EXP_OP_NEG:
 809           DEBUG_Printf(DBG_CHN_MESG, "-");
 810           break;
 811         case EXP_OP_NOT:
 812           DEBUG_Printf(DBG_CHN_MESG, "!");
 813           break;
 814         case EXP_OP_LNOT:
 815           DEBUG_Printf(DBG_CHN_MESG, "~");
 816           break;
 817         case EXP_OP_DEREF:
 818           DEBUG_Printf(DBG_CHN_MESG, "*");
 819           break;
 820         case EXP_OP_ADDR:
 821           DEBUG_Printf(DBG_CHN_MESG, "&");
 822           break;
 823         }
 824       DEBUG_DisplayExpr(exp->un.unop.exp1);
 825       break;
 826     default:
 827       DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
 828       RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 829       break;
 830     }
 831
 832   return TRUE;
 833 }
 834
 835 struct expr *
 836 DEBUG_CloneExpr(const struct expr * exp)
 837 {
 838   int           i;
 839   struct expr * rtn;
 840
 841   rtn = (struct expr *) DBG_alloc(sizeof(struct expr));
 842
 843   /*
 844    * First copy the contents of the expression itself.
 845    */
 846   *rtn = *exp;
 847
 848
 849   switch(exp->type)
 850     {
 851     case EXPR_TYPE_CAST:
 852       rtn->un.cast.expr = DEBUG_CloneExpr(exp->un.cast.expr);
 853       break;
 854     case EXPR_TYPE_INTVAR:
 855       rtn->un.intvar.name = DBG_strdup(exp->un.intvar.name);
 856       break;
 857     case EXPR_TYPE_US_CONST:
 858     case EXPR_TYPE_CONST:
 859       break;
 860     case EXPR_TYPE_STRING:
 861       rtn->un.string.str = DBG_strdup(exp->un.string.str);
 862       break;
 863     case EXPR_TYPE_SYMBOL:
 864       rtn->un.symbol.name = DBG_strdup(exp->un.symbol.name);
 865       break;
 866     case EXPR_TYPE_PSTRUCT:
 867     case EXPR_TYPE_STRUCT:
 868       rtn->un.structure.exp1 = DEBUG_CloneExpr(exp->un.structure.exp1);
 869       rtn->un.structure.element_name = DBG_strdup(exp->un.structure.element_name);
 870       break;
 871     case EXPR_TYPE_CALL:
 872       for(i=0; i < exp->un.call.nargs; i++)
 873         {
 874           rtn->un.call.arg[i]  = DEBUG_CloneExpr(exp->un.call.arg[i]);
 875         }
 876       rtn->un.call.funcname = DBG_strdup(exp->un.call.funcname);
 877       break;
 878     case EXPR_TYPE_BINOP:
 879       rtn->un.binop.exp1 = DEBUG_CloneExpr(exp->un.binop.exp1);
 880       rtn->un.binop.exp2 = DEBUG_CloneExpr(exp->un.binop.exp2);
 881       break;
 882     case EXPR_TYPE_UNOP:
 883       rtn->un.unop.exp1 = DEBUG_CloneExpr(exp->un.unop.exp1);
 884       break;
 885     default:
 886       DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
 887       RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 888       break;
 889     }
 890
 891   return rtn;
 892 }
 893
 894
 895 /*
 896  * Recursively go through an expression tree and free all memory associated
 897  * with it.
 898  */
 899 int
 900 DEBUG_FreeExpr(struct expr * exp)
 901 {
 902   int i;
 903
 904   switch(exp->type)
 905     {
 906     case EXPR_TYPE_CAST:
 907       DEBUG_FreeExpr(exp->un.cast.expr);
 908       break;
 909     case EXPR_TYPE_INTVAR:
 910       DBG_free((char *) exp->un.intvar.name);
 911       break;
 912     case EXPR_TYPE_US_CONST:
 913     case EXPR_TYPE_CONST:
 914       break;
 915     case EXPR_TYPE_STRING:
 916       DBG_free((char *) exp->un.string.str);
 917       break;
 918     case EXPR_TYPE_SYMBOL:
 919       DBG_free((char *) exp->un.symbol.name);
 920       break;
 921     case EXPR_TYPE_PSTRUCT:
 922     case EXPR_TYPE_STRUCT:
 923       DEBUG_FreeExpr(exp->un.structure.exp1);
 924       DBG_free((char *) exp->un.structure.element_name);
 925       break;
 926     case EXPR_TYPE_CALL:
 927       for(i=0; i < exp->un.call.nargs; i++)
 928         {
 929           DEBUG_FreeExpr(exp->un.call.arg[i]);
 930         }
 931       DBG_free((char *) exp->un.call.funcname);
 932       break;
 933     case EXPR_TYPE_BINOP:
 934       DEBUG_FreeExpr(exp->un.binop.exp1);
 935       DEBUG_FreeExpr(exp->un.binop.exp2);
 936       break;
 937     case EXPR_TYPE_UNOP:
 938       DEBUG_FreeExpr(exp->un.unop.exp1);
 939       break;
 940     default:
 941       DEBUG_Printf(DBG_CHN_MESG,"Unexpected expression.\n");
 942       RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 943       break;
 944     }
 945
 946   DBG_free(exp);
 947   return TRUE;
 948 }