programs/winedbg/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdarg.h>
  26
  27 #include "debugger.h"
  28 #include "expr.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(winedbg);
  32
  33 struct expr
  34 {
  35     unsigned int        type;
  36     union
  37     {
  38         struct
  39         {
  40             long int            value;
  41         } s_const;
  42
  43         struct
  44         {
  45             long unsigned int   value;
  46         } u_const;
  47
  48         struct
  49         {
  50             const char*         str;
  51         } string;
  52
  53         struct
  54         {
  55             const char*         name;
  56         } symbol;
  57
  58         struct
  59         {
  60             const char*         name;
  61         } intvar;
  62
  63         struct
  64         {
  65             int                 unop_type;
  66             struct expr*        exp1;
  67             long int            result;
  68         } unop;
  69
  70         struct
  71         {
  72             int                 binop_type;
  73             struct expr*        exp1;
  74             struct expr*        exp2;
  75             long int            result;
  76         } binop;
  77
  78         struct
  79         {
  80             struct type_expr_t  cast_to;
  81             struct expr*        expr;
  82         } cast;
  83
  84         struct
  85         {
  86             struct expr*        exp1;
  87             const char*         element_name;
  88             long int            result;
  89         } structure;
  90
  91         struct
  92         {
  93             const char*         funcname;
  94             int                 nargs;
  95             struct expr*        arg[5];
  96             long int            result;
  97         } call;
  98
  99     } un;
 100 };
 101
 102 #define EXPR_TYPE_S_CONST       0
 103 #define EXPR_TYPE_U_CONST       1
 104 #define EXPR_TYPE_SYMBOL        2
 105 #define EXPR_TYPE_INTVAR        3
 106 #define EXPR_TYPE_BINOP         4
 107 #define EXPR_TYPE_UNOP          5
 108 #define EXPR_TYPE_STRUCT        6
 109 #define EXPR_TYPE_PSTRUCT       7
 110 #define EXPR_TYPE_CALL          8
 111 #define EXPR_TYPE_STRING        9
 112 #define EXPR_TYPE_CAST          10
 113
 114 static char expr_list[4096];
 115 static unsigned int next_expr_free = 0;
 116
 117 static struct expr* expr_alloc(void)
 118 {
 119     struct expr*        rtn;
 120
 121     rtn = (struct expr*)&expr_list[next_expr_free];
 122
 123     next_expr_free += sizeof(struct expr);
 124     assert(next_expr_free < sizeof(expr_list));
 125
 126     return rtn;
 127 }
 128
 129 void expr_free_all(void)
 130 {
 131     next_expr_free = 0;
 132 }
 133
 134 struct expr* expr_alloc_typecast(struct type_expr_t* tet, struct expr* exp)
 135 {
 136     struct expr*        ex;
 137
 138     ex = expr_alloc();
 139
 140     ex->type            = EXPR_TYPE_CAST;
 141     ex->un.cast.cast_to = *tet;
 142     ex->un.cast.expr    = exp;
 143     return ex;
 144 }
 145
 146 struct expr* expr_alloc_internal_var(const char* name)
 147 {
 148     struct expr* ex;
 149
 150     ex = expr_alloc();
 151
 152     ex->type           = EXPR_TYPE_INTVAR;
 153     ex->un.intvar.name = name;
 154     return ex;
 155 }
 156
 157 struct expr* expr_alloc_symbol(const char* name)
 158 {
 159     struct expr* ex;
 160
 161     ex = expr_alloc();
 162
 163     ex->type           = EXPR_TYPE_SYMBOL;
 164     ex->un.symbol.name = name;
 165     return ex;
 166 }
 167
 168 struct expr* expr_alloc_sconstant(long int value)
 169 {
 170     struct expr*        ex;
 171
 172     ex = expr_alloc();
 173
 174     ex->type             = EXPR_TYPE_S_CONST;
 175     ex->un.s_const.value = value;
 176     return ex;
 177 }
 178
 179 struct expr* expr_alloc_uconstant(long unsigned int value)
 180 {
 181     struct expr*        ex;
 182
 183     ex = expr_alloc();
 184
 185     ex->type             = EXPR_TYPE_U_CONST;
 186     ex->un.u_const.value = value;
 187     return ex;
 188 }
 189
 190 struct expr* expr_alloc_string(const char* str)
 191 {
 192     struct expr*        ex;
 193
 194     ex = expr_alloc();
 195
 196     ex->type          = EXPR_TYPE_STRING;
 197     ex->un.string.str = str;
 198     return ex;
 199 }
 200
 201 struct expr* expr_alloc_binary_op(int op_type, struct expr* exp1, struct expr* exp2)
 202 {
 203     struct expr*        ex;
 204
 205     ex = expr_alloc();
 206
 207     ex->type                = EXPR_TYPE_BINOP;
 208     ex->un.binop.binop_type = op_type;
 209     ex->un.binop.exp1       = exp1;
 210     ex->un.binop.exp2       = exp2;
 211     return ex;
 212 }
 213
 214 struct expr* expr_alloc_unary_op(int op_type, struct expr* exp1)
 215 {
 216     struct expr*        ex;
 217
 218     ex = expr_alloc();
 219
 220     ex->type              = EXPR_TYPE_UNOP;
 221     ex->un.unop.unop_type = op_type;
 222     ex->un.unop.exp1      = exp1;
 223     return ex;
 224 }
 225
 226 struct expr* expr_alloc_struct(struct expr* exp, const char* element)
 227 {
 228     struct expr*        ex;
 229
 230     ex = expr_alloc();
 231
 232     ex->type                      = EXPR_TYPE_STRUCT;
 233     ex->un.structure.exp1         = exp;
 234     ex->un.structure.element_name = element;
 235     return ex;
 236 }
 237
 238 struct expr* expr_alloc_pstruct(struct expr* exp, const char* element)
 239 {
 240     struct expr*        ex;
 241
 242     ex = expr_alloc();
 243
 244     ex->type                      = EXPR_TYPE_PSTRUCT;
 245     ex->un.structure.exp1         = exp;
 246     ex->un.structure.element_name = element;
 247     return ex;
 248 }
 249
 250 struct expr* expr_alloc_func_call(const char* funcname, int nargs, ...)
 251 {
 252     struct expr*        ex;
 253     va_list             ap;
 254     int                 i;
 255
 256     ex = expr_alloc();
 257
 258     ex->type             = EXPR_TYPE_CALL;
 259     ex->un.call.funcname = funcname;
 260     ex->un.call.nargs    = nargs;
 261
 262     va_start(ap, nargs);
 263     for (i = 0; i < nargs; i++)
 264     {
 265         ex->un.call.arg[i] = va_arg(ap, struct expr*);
 266     }
 267     va_end(ap);
 268     return ex;
 269 }
 270
 271 /******************************************************************
 272  *              expr_eval
 273  *
 274  */
 275 struct dbg_lvalue expr_eval(struct expr* exp)
 276 {
 277     struct dbg_lvalue                   rtn;
 278     int                                 i;
 279     struct dbg_lvalue                   exp1;
 280     struct dbg_lvalue                   exp2;
 281     DWORD64                             scale1, scale2, scale3;
 282     struct dbg_type                     type1, type2;
 283     DWORD                               tag;
 284     const struct dbg_internal_var*      div;
 285
 286     rtn.cookie       = 0;
 287     rtn.type.id      = dbg_itype_none;
 288     rtn.type.module  = 0;
 289     rtn.addr.Mode    = AddrModeFlat;
 290     rtn.addr.Offset  = 0;
 291     rtn.addr.Segment = 0;
 292
 293     switch (exp->type)
 294     {
 295     case EXPR_TYPE_CAST:
 296         /* this is really brute force, we simply change the type... without
 297          * checking if this is right or not
 298          */
 299         rtn = expr_eval(exp->un.cast.expr);
 300         switch (exp->un.cast.cast_to.type)
 301         {
 302         case type_expr_type_id:
 303             if (exp->un.cast.cast_to.u.type.id == dbg_itype_none)
 304             {
 305                 dbg_printf("Can't cast to unknown type\n");
 306                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 307             }
 308             rtn.type = exp->un.cast.cast_to.u.type;
 309             break;
 310         case type_expr_udt_class:
 311         case type_expr_udt_struct:
 312         case type_expr_udt_union:
 313             rtn.type = types_find_type(rtn.type.module, exp->un.cast.cast_to.u.name,
 314                                        SymTagUDT);
 315             if (rtn.type.id == dbg_itype_none)
 316             {
 317                 dbg_printf("Can't cast to UDT %s\n", exp->un.cast.cast_to.u.name);
 318                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 319             }
 320             break;
 321         case type_expr_enumeration:
 322             rtn.type = types_find_type(rtn.type.module, exp->un.cast.cast_to.u.name,
 323                                        SymTagEnum);
 324             if (rtn.type.id == dbg_itype_none)
 325             {
 326                 dbg_printf("Can't cast to enumeration %s\n", exp->un.cast.cast_to.u.name);
 327                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 328             }
 329             break;
 330         default:
 331             dbg_printf("Unsupported cast type %u\n", exp->un.cast.cast_to.type);
 332             RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 333         }
 334         for (i = 0; i < exp->un.cast.cast_to.deref_count; i++)
 335         {
 336             rtn.type = types_find_pointer(&rtn.type);
 337             if (rtn.type.id == dbg_itype_none)
 338             {
 339                 dbg_printf("Cannot find pointer type\n");
 340                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 341             }
 342         }
 343         break;
 344     case EXPR_TYPE_STRING:
 345         rtn.cookie      = DLV_HOST;
 346         rtn.type.id     = dbg_itype_astring;
 347         rtn.type.module = 0;
 348         rtn.addr.Offset = (ULONG_PTR)&exp->un.string.str;
 349         break;
 350     case EXPR_TYPE_U_CONST:
 351         rtn.cookie      = DLV_HOST;
 352         rtn.type.id     = dbg_itype_unsigned_long_int;
 353         rtn.type.module = 0;
 354         rtn.addr.Offset = (ULONG_PTR)&exp->un.u_const.value;
 355         break;
 356     case EXPR_TYPE_S_CONST:
 357         rtn.cookie      = DLV_HOST;
 358         rtn.type.id     = dbg_itype_signed_long_int;
 359         rtn.type.module = 0;
 360         rtn.addr.Offset = (ULONG_PTR)&exp->un.s_const.value;
 361         break;
 362     case EXPR_TYPE_SYMBOL:
 363         switch (symbol_get_lvalue(exp->un.symbol.name, -1, &rtn, FALSE))
 364         {
 365         case sglv_found:
 366             break;
 367         case sglv_unknown:
 368             RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 369             /* should never be here */
 370         case sglv_aborted:
 371             RaiseException(DEBUG_STATUS_ABORT, 0, 0, NULL);
 372             /* should never be here */
 373         }
 374         break;
 375     case EXPR_TYPE_PSTRUCT:
 376         exp1 = expr_eval(exp->un.structure.exp1);
 377         if (exp1.type.id == dbg_itype_none || !types_array_index(&exp1, 0, &rtn) ||
 378             rtn.type.id == dbg_itype_none)
 379             RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 380         if (!types_udt_find_element(&rtn, exp->un.structure.element_name,
 381                                     &exp->un.structure.result))
 382         {
 383             dbg_printf("%s\n", exp->un.structure.element_name);
 384             RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
 385         }
 386         break;
 387     case EXPR_TYPE_STRUCT:
 388         exp1 = expr_eval(exp->un.structure.exp1);
 389         if (exp1.type.id == dbg_itype_none) RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 390         rtn = exp1;
 391         if (!types_udt_find_element(&rtn, exp->un.structure.element_name,
 392                                     &exp->un.structure.result))
 393         {
 394             dbg_printf("%s\n", exp->un.structure.element_name);
 395             RaiseException(DEBUG_STATUS_NO_FIELD, 0, 0, NULL);
 396         }
 397         break;
 398     case EXPR_TYPE_CALL:
 399 #if 0
 400         /*
 401          * First, evaluate all of the arguments.  If any of them are not
 402          * evaluable, then bail.
 403          */
 404         for (i = 0; i < exp->un.call.nargs; i++)
 405         {
 406             exp1 = expr_eval(exp->un.call.arg[i]);
 407             if (exp1.type.id == dbg_itype_none)
 408                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 409             cexp[i] = types_extract_as_integer(&exp1);
 410         }
 411
 412         /*
 413          * Now look up the address of the function itself.
 414          */
 415         switch (symbol_get_lvalue(exp->un.call.funcname, -1, &rtn, FALSE))
 416         {
 417         case sglv_found:
 418             break;
 419         case sglv_unknown:
 420             RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 421             /* should never be here */
 422         case sglv_aborted:
 423             RaiseException(DEBUG_STATUS_ABORT, 0, 0, NULL);
 424             /* should never be here */
 425         }
 426
 427         /* FIXME: NEWDBG NIY */
 428         /* Anyway, I wonder how this could work depending on the calling order of
 429          * the function (cdecl vs pascal for example)
 430          */
 431         int             (*fptr)();
 432
 433         fptr = (int (*)()) rtn.addr.off;
 434         switch (exp->un.call.nargs)
 435         {
 436         case 0:
 437             exp->un.call.result = (*fptr)();
 438             break;
 439         case 1:
 440             exp->un.call.result = (*fptr)(cexp[0]);
 441             break;
 442         case 2:
 443             exp->un.call.result = (*fptr)(cexp[0], cexp[1]);
 444             break;
 445         case 3:
 446             exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2]);
 447             break;
 448         case 4:
 449             exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3]);
 450             break;
 451         case 5:
 452             exp->un.call.result = (*fptr)(cexp[0], cexp[1], cexp[2], cexp[3], cexp[4]);
 453             break;
 454         }
 455 #else
 456         dbg_printf("Function call no longer implemented\n");
 457         /* would need to set up a call to this function, and then restore the current
 458          * context afterwards...
 459          */
 460         exp->un.call.result = 0;
 461 #endif
 462         rtn.cookie = DLV_HOST;
 463         /* get return type from function signature tupe */
 464         types_get_info(&rtn.type, TI_GET_TYPE, &rtn.type.id);
 465         rtn.addr.Offset = (ULONG_PTR)&exp->un.call.result;
 466         break;
 467     case EXPR_TYPE_INTVAR:
 468         rtn.cookie = DLV_HOST;
 469         if (!(div = dbg_get_internal_var(exp->un.intvar.name)))
 470             RaiseException(DEBUG_STATUS_NO_SYMBOL, 0, 0, NULL);
 471         rtn.type.id     = div->typeid;
 472         rtn.type.module = 0;
 473         rtn.addr.Offset = (ULONG_PTR)div->pval;
 474         break;
 475     case EXPR_TYPE_BINOP:
 476         rtn.cookie = DLV_HOST;
 477         exp1 = expr_eval(exp->un.binop.exp1);
 478         exp2 = expr_eval(exp->un.binop.exp2);
 479         if (exp1.type.id == dbg_itype_none || exp2.type.id == dbg_itype_none)
 480             RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 481         rtn.type.id = dbg_itype_signed_int;
 482         rtn.type.module = 0;
 483         rtn.addr.Offset = (ULONG_PTR)&exp->un.binop.result;
 484         type1 = exp1.type;
 485         type2 = exp2.type;
 486         switch (exp->un.binop.binop_type)
 487         {
 488         case EXP_OP_ADD:
 489             if (!types_get_info(&exp1.type, TI_GET_SYMTAG, &tag) ||
 490                 tag != SymTagPointerType ||
 491                 !types_get_info(&exp1.type, TI_GET_TYPE, &type1.id))
 492                 type1.id = dbg_itype_none;
 493             if (!types_get_info(&exp2.type, TI_GET_SYMTAG, &tag) ||
 494                 tag != SymTagPointerType ||
 495                 !types_get_info(&exp2.type, TI_GET_TYPE, &type2.id))
 496                 type2.id = dbg_itype_none;
 497             scale1 = 1;
 498             scale2 = 1;
 499             if (type1.id != dbg_itype_none && type2.id != dbg_itype_none)
 500                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 501             if (type1.id != dbg_itype_none)
 502             {
 503                 types_get_info(&type1, TI_GET_LENGTH, &scale2);
 504                 rtn.type = exp1.type;
 505             }
 506             else if (type2.id != dbg_itype_none)
 507             {
 508                 types_get_info(&type2, TI_GET_LENGTH, &scale1);
 509                 rtn.type = exp2.type;
 510             }
 511             exp->un.binop.result = types_extract_as_integer(&exp1) * (DWORD)scale1 +
 512                 (DWORD)scale2 * types_extract_as_integer(&exp2);
 513             break;
 514         case EXP_OP_SUB:
 515             if (!types_get_info(&exp1.type, TI_GET_SYMTAG, &tag) ||
 516                 tag != SymTagPointerType ||
 517                 !types_get_info(&exp1.type, TI_GET_TYPE, &type1.id))
 518                 type1.id = dbg_itype_none;
 519             if (!types_get_info(&exp2.type, TI_GET_SYMTAG, &tag) ||
 520                 tag != SymTagPointerType ||
 521                 !types_get_info(&exp2.type, TI_GET_TYPE, &type2.id))
 522                 type2.id = dbg_itype_none;
 523             scale1 = 1;
 524             scale2 = 1;
 525             scale3 = 1;
 526             if (type1.id != dbg_itype_none && type2.id != dbg_itype_none)
 527             {
 528                 WINE_FIXME("This may fail (if module base address are wrongly calculated)\n");
 529                 if (memcmp(&type1, &type2, sizeof(struct dbg_type)))
 530                     RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 531                 types_get_info(&type1, TI_GET_LENGTH, &scale3);
 532             }
 533             else if (type1.id != dbg_itype_none)
 534             {
 535                 types_get_info(&type1, TI_GET_LENGTH, &scale2);
 536                 rtn.type = exp1.type;
 537             }
 538             else if (type2.id != dbg_itype_none)
 539             {
 540                 types_get_info(&type2, TI_GET_LENGTH, &scale1);
 541                 rtn.type = exp2.type;
 542             }
 543             exp->un.binop.result = (types_extract_as_integer(&exp1) * (DWORD)scale1 -
 544                                     types_extract_as_integer(&exp2) * (DWORD)scale2) / (DWORD)scale3;
 545             break;
 546         case EXP_OP_SEG:
 547             rtn.type.id = dbg_itype_segptr;
 548             rtn.type.module = 0;
 549             be_cpu->build_addr(dbg_curr_thread->handle, &dbg_context, &rtn.addr,
 550                                types_extract_as_integer(&exp1), types_extract_as_integer(&exp2));
 551             break;
 552         case EXP_OP_LOR:
 553             exp->un.binop.result = (types_extract_as_integer(&exp1) || types_extract_as_integer(&exp2));
 554             break;
 555         case EXP_OP_LAND:
 556             exp->un.binop.result = (types_extract_as_integer(&exp1) && types_extract_as_integer(&exp2));
 557             break;
 558         case EXP_OP_OR:
 559             exp->un.binop.result = (types_extract_as_integer(&exp1) | types_extract_as_integer(&exp2));
 560             break;
 561         case EXP_OP_AND:
 562             exp->un.binop.result = (types_extract_as_integer(&exp1) & types_extract_as_integer(&exp2));
 563             break;
 564         case EXP_OP_XOR:
 565             exp->un.binop.result = (types_extract_as_integer(&exp1) ^ types_extract_as_integer(&exp2));
 566             break;
 567         case EXP_OP_EQ:
 568             exp->un.binop.result = (types_extract_as_integer(&exp1) == types_extract_as_integer(&exp2));
 569             break;
 570         case EXP_OP_GT:
 571             exp->un.binop.result = (types_extract_as_integer(&exp1) > types_extract_as_integer(&exp2));
 572             break;
 573         case EXP_OP_LT:
 574             exp->un.binop.result = (types_extract_as_integer(&exp1) < types_extract_as_integer(&exp2));
 575             break;
 576         case EXP_OP_GE:
 577             exp->un.binop.result = (types_extract_as_integer(&exp1) >= types_extract_as_integer(&exp2));
 578             break;
 579         case EXP_OP_LE:
 580             exp->un.binop.result = (types_extract_as_integer(&exp1) <= types_extract_as_integer(&exp2));
 581             break;
 582         case EXP_OP_NE:
 583             exp->un.binop.result = (types_extract_as_integer(&exp1) != types_extract_as_integer(&exp2));
 584             break;
 585         case EXP_OP_SHL:
 586             exp->un.binop.result = ((unsigned long)types_extract_as_integer(&exp1) << types_extract_as_integer(&exp2));
 587             break;
 588         case EXP_OP_SHR:
 589             exp->un.binop.result = ((unsigned long)types_extract_as_integer(&exp1) >> types_extract_as_integer(&exp2));
 590             break;
 591         case EXP_OP_MUL:
 592             exp->un.binop.result = (types_extract_as_integer(&exp1) * types_extract_as_integer(&exp2));
 593             break;
 594         case EXP_OP_DIV:
 595             if (types_extract_as_integer(&exp2) == 0) RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
 596             exp->un.binop.result = (types_extract_as_integer(&exp1) / types_extract_as_integer(&exp2));
 597             break;
 598         case EXP_OP_REM:
 599             if (types_extract_as_integer(&exp2) == 0) RaiseException(DEBUG_STATUS_DIV_BY_ZERO, 0, 0, NULL);
 600             exp->un.binop.result = (types_extract_as_integer(&exp1) % types_extract_as_integer(&exp2));
 601             break;
 602         case EXP_OP_ARR:
 603             if (!types_array_index(&exp1, types_extract_as_integer(&exp2), &rtn))
 604                 RaiseException(DEBUG_STATUS_CANT_DEREF, 0, 0, NULL);
 605             break;
 606         default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 607         }
 608         break;
 609     case EXPR_TYPE_UNOP:
 610         rtn.cookie = DLV_HOST;
 611         exp1 = expr_eval(exp->un.unop.exp1);
 612         if (exp1.type.id == dbg_itype_none) RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 613         rtn.addr.Offset = (ULONG_PTR)&exp->un.unop.result;
 614         rtn.type.id     = dbg_itype_signed_int;
 615         rtn.type.module = 0;
 616         switch (exp->un.unop.unop_type)
 617         {
 618         case EXP_OP_NEG:
 619             exp->un.unop.result = -types_extract_as_integer(&exp1);
 620             break;
 621         case EXP_OP_NOT:
 622             exp->un.unop.result = !types_extract_as_integer(&exp1);
 623             break;
 624         case EXP_OP_LNOT:
 625             exp->un.unop.result = ~types_extract_as_integer(&exp1);
 626             break;
 627         case EXP_OP_DEREF:
 628             if (!types_array_index(&exp1, 0, &rtn))
 629                 RaiseException(DEBUG_STATUS_BAD_TYPE, 0, 0, NULL);
 630             break;
 631         case EXP_OP_FORCE_DEREF:
 632             rtn = exp1;
 633             if (exp1.cookie == DLV_TARGET)
 634                 dbg_read_memory(memory_to_linear_addr(&exp1.addr), &rtn.addr.Offset, sizeof(rtn.addr.Offset));
 635             break;
 636         case EXP_OP_ADDR:
 637             /* only do it on linear addresses */
 638             if (exp1.addr.Mode != AddrModeFlat)
 639                 RaiseException(DEBUG_STATUS_CANT_DEREF, 0, 0, NULL);
 640             exp->un.unop.result = (ULONG_PTR)memory_to_linear_addr(&exp1.addr);
 641             rtn.type = types_find_pointer(&exp1.type);
 642             if (rtn.type.id == dbg_itype_none)
 643                 RaiseException(DEBUG_STATUS_CANT_DEREF, 0, 0, NULL);
 644             break;
 645         default: RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 646         }
 647         break;
 648     default:
 649         WINE_FIXME("Unexpected expression (%d).\n", exp->type);
 650         RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 651         break;
 652     }
 653
 654     return rtn;
 655 }
 656
 657 int expr_print(const struct expr* exp)
 658 {
 659     int                 i;
 660     struct dbg_type     type;
 661
 662     switch (exp->type)
 663     {
 664     case EXPR_TYPE_CAST:
 665         WINE_FIXME("No longer supported (missing module base)\n");
 666         dbg_printf("((");
 667         switch (exp->un.cast.cast_to.type)
 668         {
 669         case type_expr_type_id:
 670             type.module = 0;
 671             type.id = exp->un.cast.cast_to.type;
 672             types_print_type(&type, FALSE); break;
 673         case type_expr_udt_class:
 674             dbg_printf("class %s", exp->un.cast.cast_to.u.name); break;
 675         case type_expr_udt_struct:
 676             dbg_printf("struct %s", exp->un.cast.cast_to.u.name); break;
 677         case type_expr_udt_union:
 678             dbg_printf("union %s", exp->un.cast.cast_to.u.name); break;
 679         case type_expr_enumeration:
 680             dbg_printf("enum %s", exp->un.cast.cast_to.u.name); break;
 681         }
 682         for (i = 0; i < exp->un.cast.cast_to.deref_count; i++)
 683             dbg_printf("*");
 684         dbg_printf(")");
 685         expr_print(exp->un.cast.expr);
 686         dbg_printf(")");
 687         break;
 688     case EXPR_TYPE_INTVAR:
 689         dbg_printf("$%s", exp->un.intvar.name);
 690         break;
 691     case EXPR_TYPE_U_CONST:
 692         dbg_printf("%lu", exp->un.u_const.value);
 693         break;
 694     case EXPR_TYPE_S_CONST:
 695         dbg_printf("%ld", exp->un.s_const.value);
 696         break;
 697     case EXPR_TYPE_STRING:
 698         dbg_printf("\"%s\"", exp->un.string.str);
 699         break;
 700     case EXPR_TYPE_SYMBOL:
 701         dbg_printf("%s" , exp->un.symbol.name);
 702         break;
 703     case EXPR_TYPE_PSTRUCT:
 704         expr_print(exp->un.structure.exp1);
 705         dbg_printf("->%s", exp->un.structure.element_name);
 706         break;
 707     case EXPR_TYPE_STRUCT:
 708         expr_print(exp->un.structure.exp1);
 709         dbg_printf(".%s", exp->un.structure.element_name);
 710         break;
 711     case EXPR_TYPE_CALL:
 712         dbg_printf("%s(",exp->un.call.funcname);
 713         for (i = 0; i < exp->un.call.nargs; i++)
 714         {
 715             expr_print(exp->un.call.arg[i]);
 716             if (i != exp->un.call.nargs - 1) dbg_printf(", ");
 717         }
 718         dbg_printf(")");
 719         break;
 720     case EXPR_TYPE_BINOP:
 721         dbg_printf("(");
 722         expr_print(exp->un.binop.exp1);
 723         switch (exp->un.binop.binop_type)
 724         {
 725         case EXP_OP_ADD:        dbg_printf(" + ");    break;
 726         case EXP_OP_SUB:        dbg_printf(" - ");    break;
 727         case EXP_OP_SEG:        dbg_printf(":");      break;
 728         case EXP_OP_LOR:        dbg_printf(" || ");   break;
 729         case EXP_OP_LAND:       dbg_printf(" && ");   break;
 730         case EXP_OP_OR:         dbg_printf(" | ");    break;
 731         case EXP_OP_AND:        dbg_printf(" & ");    break;
 732         case EXP_OP_XOR:        dbg_printf(" ^ ");    break;
 733         case EXP_OP_EQ:         dbg_printf(" == ");   break;
 734         case EXP_OP_GT:         dbg_printf(" > ");    break;
 735         case EXP_OP_LT:         dbg_printf(" < ");    break;
 736         case EXP_OP_GE:         dbg_printf(" >= ");   break;
 737         case EXP_OP_LE:         dbg_printf(" <= ");   break;
 738         case EXP_OP_NE:         dbg_printf(" != ");   break;
 739         case EXP_OP_SHL:        dbg_printf(" << ");   break;
 740         case EXP_OP_SHR:        dbg_printf(" >> ");   break;
 741         case EXP_OP_MUL:        dbg_printf(" * ");    break;
 742         case EXP_OP_DIV:        dbg_printf(" / ");    break;
 743         case EXP_OP_REM:        dbg_printf(" %% ");   break;
 744         case EXP_OP_ARR:        dbg_printf("[");      break;
 745         default:                                      break;
 746         }
 747         expr_print(exp->un.binop.exp2);
 748         if (exp->un.binop.binop_type == EXP_OP_ARR) dbg_printf("]");
 749         dbg_printf(")");
 750         break;
 751     case EXPR_TYPE_UNOP:
 752         switch (exp->un.unop.unop_type)
 753         {
 754         case EXP_OP_NEG:        dbg_printf("-");      break;
 755         case EXP_OP_NOT:        dbg_printf("!");      break;
 756         case EXP_OP_LNOT:       dbg_printf("~");      break;
 757         case EXP_OP_DEREF:      dbg_printf("*");      break;
 758         case EXP_OP_ADDR:       dbg_printf("&");      break;
 759         }
 760         expr_print(exp->un.unop.exp1);
 761         break;
 762     default:
 763         WINE_FIXME("Unexpected expression (%u).\n", exp->type);
 764         RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 765         break;
 766     }
 767
 768     return TRUE;
 769 }
 770
 771 struct expr* expr_clone(const struct expr* exp, BOOL *local_binding)
 772 {
 773     int                 i;
 774     struct expr*        rtn;
 775
 776     rtn = HeapAlloc(GetProcessHeap(), 0, sizeof(struct expr));
 777
 778     /*
 779      * First copy the contents of the expression itself.
 780      */
 781     *rtn = *exp;
 782
 783     switch (exp->type)
 784     {
 785     case EXPR_TYPE_CAST:
 786         rtn->un.cast.expr = expr_clone(exp->un.cast.expr, local_binding);
 787         break;
 788     case EXPR_TYPE_INTVAR:
 789         rtn->un.intvar.name = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(exp->un.intvar.name) + 1), exp->un.intvar.name);
 790         break;
 791     case EXPR_TYPE_U_CONST:
 792     case EXPR_TYPE_S_CONST:
 793         break;
 794     case EXPR_TYPE_STRING:
 795         rtn->un.string.str = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(exp->un.string.str) + 1), exp->un.string.str);
 796         break;
 797     case EXPR_TYPE_SYMBOL:
 798         rtn->un.symbol.name = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(exp->un.symbol.name) + 1), exp->un.symbol.name);
 799         if (local_binding && symbol_is_local(exp->un.symbol.name))
 800             *local_binding = TRUE;
 801         break;
 802     case EXPR_TYPE_PSTRUCT:
 803     case EXPR_TYPE_STRUCT:
 804         rtn->un.structure.exp1 = expr_clone(exp->un.structure.exp1, local_binding);
 805         rtn->un.structure.element_name = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(exp->un.structure.element_name) + 1), exp->un.structure.element_name);
 806         break;
 807     case EXPR_TYPE_CALL:
 808         for (i = 0; i < exp->un.call.nargs; i++)
 809         {
 810             rtn->un.call.arg[i] = expr_clone(exp->un.call.arg[i], local_binding);
 811         }
 812         rtn->un.call.funcname = strcpy(HeapAlloc(GetProcessHeap(), 0, strlen(exp->un.call.funcname) + 1), exp->un.call.funcname);
 813         break;
 814     case EXPR_TYPE_BINOP:
 815         rtn->un.binop.exp1 = expr_clone(exp->un.binop.exp1, local_binding);
 816         rtn->un.binop.exp2 = expr_clone(exp->un.binop.exp2, local_binding);
 817         break;
 818     case EXPR_TYPE_UNOP:
 819         rtn->un.unop.exp1 = expr_clone(exp->un.unop.exp1, local_binding);
 820         break;
 821     default:
 822         WINE_FIXME("Unexpected expression (%u).\n", exp->type);
 823         RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 824         break;
 825     }
 826
 827     return rtn;
 828 }
 829
 830
 831 /*
 832  * Recursively go through an expression tree and free all memory associated
 833  * with it.
 834  */
 835 int expr_free(struct expr* exp)
 836 {
 837     int i;
 838
 839     switch (exp->type)
 840     {
 841     case EXPR_TYPE_CAST:
 842         expr_free(exp->un.cast.expr);
 843         break;
 844     case EXPR_TYPE_INTVAR:
 845         HeapFree(GetProcessHeap(), 0, (char*)exp->un.intvar.name);
 846         break;
 847     case EXPR_TYPE_U_CONST:
 848     case EXPR_TYPE_S_CONST:
 849         break;
 850     case EXPR_TYPE_STRING:
 851         HeapFree(GetProcessHeap(), 0, (char*)exp->un.string.str);
 852         break;
 853     case EXPR_TYPE_SYMBOL:
 854         HeapFree(GetProcessHeap(), 0, (char*)exp->un.symbol.name);
 855         break;
 856     case EXPR_TYPE_PSTRUCT:
 857     case EXPR_TYPE_STRUCT:
 858         expr_free(exp->un.structure.exp1);
 859         HeapFree(GetProcessHeap(), 0, (char*)exp->un.structure.element_name);
 860         break;
 861     case EXPR_TYPE_CALL:
 862         for (i = 0; i < exp->un.call.nargs; i++)
 863         {
 864             expr_free(exp->un.call.arg[i]);
 865         }
 866         HeapFree(GetProcessHeap(), 0, (char*)exp->un.call.funcname);
 867         break;
 868     case EXPR_TYPE_BINOP:
 869         expr_free(exp->un.binop.exp1);
 870         expr_free(exp->un.binop.exp2);
 871         break;
 872     case EXPR_TYPE_UNOP:
 873         expr_free(exp->un.unop.exp1);
 874         break;
 875     default:
 876         WINE_FIXME("Unexpected expression (%u).\n", exp->type);
 877         RaiseException(DEBUG_STATUS_INTERNAL_ERROR, 0, 0, NULL);
 878         break;
 879     }
 880
 881     HeapFree(GetProcessHeap(), 0, exp);
 882     return TRUE;
 883 }