exec.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdarg.h>
   5
   6 #include "gmqcc.h"
   7
   8 MEM_VEC_FUNCTIONS(qc_program,   prog_section_statement, code)
   9 MEM_VEC_FUNCTIONS(qc_program,   prog_section_def,       defs)
  10 MEM_VEC_FUNCTIONS(qc_program,   prog_section_def,       fields)
  11 MEM_VEC_FUNCTIONS(qc_program,   prog_section_function,  functions)
  12 MEM_VEC_FUNCTIONS(qc_program,   char,                   strings)
  13 MEM_VEC_FUN_APPEND(qc_program,  char,                   strings)
  14 MEM_VEC_FUN_RESIZE(qc_program,  char,                   strings)
  15 MEM_VEC_FUNCTIONS(qc_program,   qcint,                  globals)
  16 MEM_VEC_FUNCTIONS(qc_program,   qcint,                  entitydata)
  17 MEM_VEC_FUNCTIONS(qc_program,   bool,                   entitypool)
  18
  19 MEM_VEC_FUNCTIONS(qc_program,   qcint,         localstack)
  20 MEM_VEC_FUN_APPEND(qc_program,  qcint,         localstack)
  21 MEM_VEC_FUN_RESIZE(qc_program,  qcint,         localstack)
  22 MEM_VEC_FUNCTIONS(qc_program,   qc_exec_stack, stack)
  23
  24 MEM_VEC_FUNCTIONS(qc_program,   size_t, profile)
  25 MEM_VEC_FUN_RESIZE(qc_program,  size_t, profile)
  26
  27 MEM_VEC_FUNCTIONS(qc_program,   prog_builtin, builtins)
  28
  29 static void loaderror(const char *fmt, ...)
  30 {
  31     int     err = errno;
  32     va_list ap;
  33     va_start(ap, fmt);
  34     vprintf(fmt, ap);
  35     va_end(ap);
  36     printf(": %s\n", strerror(err));
  37 }
  38
  39 static void qcvmerror(qc_program *prog, const char *fmt, ...)
  40 {
  41     va_list ap;
  42
  43     prog->vmerror++;
  44
  45     va_start(ap, fmt);
  46     vprintf(fmt, ap);
  47     va_end(ap);
  48     putchar('\n');
  49 }
  50
  51 qc_program* prog_load(const char *filename)
  52 {
  53     qc_program *prog;
  54     prog_header header;
  55     size_t      i;
  56     FILE *file;
  57
  58     file = util_fopen(filename, "rb");
  59     if (!file)
  60         return NULL;
  61
  62     if (fread(&header, sizeof(header), 1, file) != 1) {
  63         loaderror("failed to read header from '%s'", filename);
  64         fclose(file);
  65         return NULL;
  66     }
  67
  68     if (header.version != 6) {
  69         loaderror("header says this is a version %i progs, we need version 6\n", header.version);
  70         fclose(file);
  71         return NULL;
  72     }
  73
  74     prog = (qc_program*)mem_a(sizeof(qc_program));
  75     if (!prog) {
  76         fclose(file);
  77         printf("failed to allocate program data\n");
  78         return NULL;
  79     }
  80     memset(prog, 0, sizeof(*prog));
  81
  82     prog->entityfields = header.entfield;
  83     prog->crc16 = header.crc16;
  84
  85     prog->filename = util_strdup(filename);
  86     if (!prog->filename) {
  87         loaderror("failed to store program name");
  88         goto error;
  89     }
  90
  91 #define read_data(hdrvar, progvar, type)                                         \
  92     if (fseek(file, header.hdrvar.offset, SEEK_SET) != 0) {                      \
  93         loaderror("seek failed");                                                \
  94         goto error;                                                              \
  95     }                                                                            \
  96     prog->progvar##_alloc = header.hdrvar.length;                                \
  97     prog->progvar##_count = header.hdrvar.length;                                \
  98     prog->progvar = (type*)mem_a(header.hdrvar.length * sizeof(*prog->progvar)); \
  99     if (!prog->progvar)                                                          \
 100         goto error;                                                              \
 101     if (fread(prog->progvar, sizeof(*prog->progvar), header.hdrvar.length, file) \
 102         != header.hdrvar.length) {                                               \
 103         loaderror("read failed");                                                \
 104         goto error;                                                              \
 105     }
 106 #define read_data1(x, y) read_data(x, x, y)
 107
 108     read_data (statements, code, prog_section_statement);
 109     read_data1(defs,             prog_section_def);
 110     read_data1(fields,           prog_section_def);
 111     read_data1(functions,        prog_section_function);
 112     read_data1(strings,          char);
 113     read_data1(globals,          qcint);
 114
 115     fclose(file);
 116
 117     /* profile counters */
 118     if (!qc_program_profile_resize(prog, prog->code_count))
 119         goto error;
 120
 121     /* Add tempstring area */
 122     prog->tempstring_start = prog->strings_count;
 123     prog->tempstring_at    = prog->strings_count;
 124     if (!qc_program_strings_resize(prog, prog->strings_count + 16*1024))
 125         goto error;
 126
 127     /* spawn the world entity */
 128     if (!qc_program_entitypool_add(prog, true)) {
 129         loaderror("failed to allocate world entity\n");
 130         goto error;
 131     }
 132     for (i = 0; i < prog->entityfields; ++i) {
 133         if (!qc_program_entitydata_add(prog, 0)) {
 134             loaderror("failed to allocate world data\n");
 135             goto error;
 136         }
 137     }
 138     prog->entities = 1;
 139
 140     return prog;
 141
 142 error:
 143     if (prog->filename)   mem_d(prog->filename);
 144     if (prog->code)       mem_d(prog->code);
 145     if (prog->defs)       mem_d(prog->defs);
 146     if (prog->fields)     mem_d(prog->fields);
 147     if (prog->functions)  mem_d(prog->functions);
 148     if (prog->strings)    mem_d(prog->strings);
 149     if (prog->globals)    mem_d(prog->globals);
 150     if (prog->entitydata) mem_d(prog->entitydata);
 151     if (prog->entitypool) mem_d(prog->entitypool);
 152     mem_d(prog);
 153     return NULL;
 154 }
 155
 156 void prog_delete(qc_program *prog)
 157 {
 158     if (prog->filename) mem_d(prog->filename);
 159     MEM_VECTOR_CLEAR(prog, code);
 160     MEM_VECTOR_CLEAR(prog, defs);
 161     MEM_VECTOR_CLEAR(prog, fields);
 162     MEM_VECTOR_CLEAR(prog, functions);
 163     MEM_VECTOR_CLEAR(prog, strings);
 164     MEM_VECTOR_CLEAR(prog, globals);
 165     MEM_VECTOR_CLEAR(prog, entitydata);
 166     MEM_VECTOR_CLEAR(prog, entitypool);
 167     MEM_VECTOR_CLEAR(prog, localstack);
 168     MEM_VECTOR_CLEAR(prog, stack);
 169     MEM_VECTOR_CLEAR(prog, profile);
 170
 171     if (prog->builtins_alloc) {
 172         MEM_VECTOR_CLEAR(prog, builtins);
 173     }
 174     /* otherwise the builtins were statically allocated */
 175     mem_d(prog);
 176 }
 177
 178 /***********************************************************************
 179  * VM code
 180  */
 181
 182 char* prog_getstring(qc_program *prog, qcint str)
 183 {
 184     if (str < 0 || str >= prog->strings_count)
 185         return "<<<invalid string>>>";
 186     return prog->strings + str;
 187 }
 188
 189 prog_section_def* prog_entfield(qc_program *prog, qcint off)
 190 {
 191     size_t i;
 192     for (i = 0; i < prog->fields_count; ++i) {
 193         if (prog->fields[i].offset == off)
 194             return (prog->fields + i);
 195     }
 196     return NULL;
 197 }
 198
 199 prog_section_def* prog_getdef(qc_program *prog, qcint off)
 200 {
 201     size_t i;
 202     for (i = 0; i < prog->defs_count; ++i) {
 203         if (prog->defs[i].offset == off)
 204             return (prog->defs + i);
 205     }
 206     return NULL;
 207 }
 208
 209 qcany* prog_getedict(qc_program *prog, qcint e)
 210 {
 211     if (e >= prog->entitypool_count) {
 212         prog->vmerror++;
 213         printf("Accessing out of bounds edict %i\n", (int)e);
 214         e = 0;
 215     }
 216     return (qcany*)(prog->entitydata + (prog->entityfields * e));
 217 }
 218
 219 qcint prog_spawn_entity(qc_program *prog)
 220 {
 221     char  *data;
 222     size_t i;
 223     qcint  e;
 224     for (e = 0; e < (qcint)prog->entitypool_count; ++e) {
 225         if (!prog->entitypool[e]) {
 226             data = (char*)(prog->entitydata + (prog->entityfields * e));
 227             memset(data, 0, prog->entityfields * sizeof(qcint));
 228             return e;
 229         }
 230     }
 231     if (!qc_program_entitypool_add(prog, true)) {
 232         prog->vmerror++;
 233         printf("Failed to allocate entity\n");
 234         return 0;
 235     }
 236     prog->entities++;
 237     for (i = 0; i < prog->entityfields; ++i) {
 238         if (!qc_program_entitydata_add(prog, 0)) {
 239             printf("Failed to allocate entity\n");
 240             return 0;
 241         }
 242     }
 243     data = (char*)(prog->entitydata + (prog->entityfields * e));
 244     memset(data, 0, prog->entityfields * sizeof(qcint));
 245     return e;
 246 }
 247
 248 void prog_free_entity(qc_program *prog, qcint e)
 249 {
 250     if (!e) {
 251         prog->vmerror++;
 252         printf("Trying to free world entity\n");
 253         return;
 254     }
 255     if (e >= prog->entitypool_count) {
 256         prog->vmerror++;
 257         printf("Trying to free out of bounds entity\n");
 258         return;
 259     }
 260     if (!prog->entitypool[e]) {
 261         prog->vmerror++;
 262         printf("Double free on entity\n");
 263         return;
 264     }
 265     prog->entitypool[e] = false;
 266 }
 267
 268 qcint prog_tempstring(qc_program *prog, const char *_str)
 269 {
 270     /* we don't access it, but the macro-generated functions don't use
 271      * const
 272      */
 273     char *str = (char*)_str;
 274
 275     size_t len = strlen(str);
 276     size_t at = prog->tempstring_at;
 277
 278     /* when we reach the end we start over */
 279     if (at + len >= prog->strings_count)
 280         at = prog->tempstring_start;
 281
 282     /* when it doesn't fit, reallocate */
 283     if (at + len >= prog->strings_count)
 284     {
 285         prog->strings_count = at;
 286         if (!qc_program_strings_append(prog, str, len+1)) {
 287             prog->vmerror = VMERR_TEMPSTRING_ALLOC;
 288             return 0;
 289         }
 290         return at;
 291     }
 292
 293     /* when it fits, just copy */
 294     memcpy(prog->strings + at, str, len+1);
 295     prog->tempstring_at += len+1;
 296     return at;
 297 }
 298
 299 static int print_escaped_string(const char *str)
 300 {
 301     int len = 2;
 302     putchar('"');
 303     while (*str) {
 304         switch (*str) {
 305             case '\a': len += 2; putchar('\\'); putchar('a'); break;
 306             case '\b': len += 2; putchar('\\'); putchar('b'); break;
 307             case '\r': len += 2; putchar('\\'); putchar('r'); break;
 308             case '\n': len += 2; putchar('\\'); putchar('n'); break;
 309             case '\t': len += 2; putchar('\\'); putchar('t'); break;
 310             case '\f': len += 2; putchar('\\'); putchar('f'); break;
 311             case '\v': len += 2; putchar('\\'); putchar('v'); break;
 312             case '\\': len += 2; putchar('\\'); putchar('\\'); break;
 313             case '"':  len += 2; putchar('\\'); putchar('"'); break;
 314             default:
 315                 ++len;
 316                 putchar(*str);
 317                 break;
 318         }
 319         ++str;
 320     }
 321     putchar('"');
 322     return len;
 323 }
 324
 325 static void trace_print_global(qc_program *prog, unsigned int glob, int vtype)
 326 {
 327     static char spaces[40+1] = "                                        ";
 328     prog_section_def *def;
 329     qcany    *value;
 330     int       len;
 331
 332     if (!glob) {
 333         len = printf("<null>,");
 334         goto done;
 335     }
 336
 337     def = prog_getdef(prog, glob);
 338     value = (qcany*)(&prog->globals[glob]);
 339
 340     if (def) {
 341         len = printf("[%s] ", prog_getstring(prog, def->name));
 342         vtype = def->type;
 343     }
 344     else
 345         len = printf("[@%u] ", glob);
 346
 347     switch (vtype) {
 348         case TYPE_VOID:
 349         case TYPE_ENTITY:
 350         case TYPE_FIELD:
 351         case TYPE_FUNCTION:
 352         case TYPE_POINTER:
 353             len += printf("%i,", value->_int);
 354             break;
 355         case TYPE_VECTOR:
 356             len += printf("'%g %g %g',", value->vector[0],
 357                                          value->vector[1],
 358                                          value->vector[2]);
 359             break;
 360         case TYPE_STRING:
 361             len += print_escaped_string(prog_getstring(prog, value->string));
 362             len += printf(",");
 363             /* len += printf("\"%s\",", prog_getstring(prog, value->string)); */
 364             break;
 365         case TYPE_FLOAT:
 366         default:
 367             len += printf("%g,", value->_float);
 368             break;
 369     }
 370 done:
 371     if (len < sizeof(spaces)-1) {
 372         spaces[sizeof(spaces)-1-len] = 0;
 373         printf(spaces);
 374         spaces[sizeof(spaces)-1-len] = ' ';
 375     }
 376 }
 377
 378 static void prog_print_statement(qc_program *prog, prog_section_statement *st)
 379 {
 380     if (st->opcode >= (sizeof(asm_instr)/sizeof(asm_instr[0]))) {
 381         printf("<illegal instruction %d>\n", st->opcode);
 382         return;
 383     }
 384     printf(" <> %-12s", asm_instr[st->opcode].m);
 385     if (st->opcode >= INSTR_IF &&
 386         st->opcode <= INSTR_IFNOT)
 387     {
 388         trace_print_global(prog, st->o1.u1, TYPE_FLOAT);
 389         printf("%d\n", st->o2.s1);
 390     }
 391     else if (st->opcode >= INSTR_CALL0 &&
 392              st->opcode <= INSTR_CALL8)
 393     {
 394         printf("\n");
 395     }
 396     else if (st->opcode == INSTR_GOTO)
 397     {
 398         printf("%i\n", st->o1.s1);
 399     }
 400     else
 401     {
 402         int t[3] = { TYPE_FLOAT, TYPE_FLOAT, TYPE_FLOAT };
 403         switch (st->opcode)
 404         {
 405             case INSTR_MUL_FV:
 406                 t[1] = t[2] = TYPE_VECTOR;
 407                 break;
 408             case INSTR_MUL_VF:
 409                 t[0] = t[2] = TYPE_VECTOR;
 410                 break;
 411             case INSTR_MUL_V:
 412                 t[0] = t[1] = TYPE_VECTOR;
 413                 break;
 414             case INSTR_ADD_V:
 415             case INSTR_SUB_V:
 416             case INSTR_EQ_V:
 417             case INSTR_NE_V:
 418                 t[0] = t[1] = t[2] = TYPE_VECTOR;
 419                 break;
 420             case INSTR_EQ_S:
 421             case INSTR_NE_S:
 422                 t[0] = t[1] = TYPE_STRING;
 423                 break;
 424             case INSTR_STORE_F:
 425             case INSTR_STOREP_F:
 426                 t[2] = -1;
 427                 break;
 428             case INSTR_STORE_V:
 429                 t[0] = t[1] = TYPE_VECTOR; t[2] = -1;
 430                 break;
 431             case INSTR_STORE_S:
 432                 t[0] = t[1] = TYPE_STRING; t[2] = -1;
 433                 break;
 434             case INSTR_STORE_ENT:
 435                 t[0] = t[1] = TYPE_ENTITY; t[2] = -1;
 436                 break;
 437             case INSTR_STORE_FLD:
 438                 t[0] = t[1] = TYPE_FIELD; t[2] = -1;
 439                 break;
 440             case INSTR_STORE_FNC:
 441                 t[0] = t[1] = TYPE_FUNCTION; t[2] = -1;
 442                 break;
 443             case INSTR_STOREP_V:
 444                 t[0] = TYPE_VECTOR; t[1] = TYPE_ENTITY; t[2] = -1;
 445                 break;
 446             case INSTR_STOREP_S:
 447                 t[0] = TYPE_STRING; t[1] = TYPE_ENTITY; t[2] = -1;
 448                 break;
 449             case INSTR_STOREP_ENT:
 450                 t[0] = TYPE_ENTITY; t[1] = TYPE_ENTITY; t[2] = -1;
 451                 break;
 452             case INSTR_STOREP_FLD:
 453                 t[0] = TYPE_FIELD; t[1] = TYPE_ENTITY; t[2] = -1;
 454                 break;
 455             case INSTR_STOREP_FNC:
 456                 t[0] = TYPE_FUNCTION; t[1] = TYPE_ENTITY; t[2] = -1;
 457                 break;
 458         }
 459         if (t[0] >= 0) trace_print_global(prog, st->o1.u1, t[0]);
 460         else           printf("(none),          ");
 461         if (t[1] >= 0) trace_print_global(prog, st->o2.u1, t[1]);
 462         else           printf("(none),          ");
 463         if (t[2] >= 0) trace_print_global(prog, st->o3.u1, t[2]);
 464         else           printf("(none)");
 465         printf("\n");
 466     }
 467     fflush(stdout);
 468 }
 469
 470 static qcint prog_enterfunction(qc_program *prog, prog_section_function *func)
 471 {
 472     qc_exec_stack st;
 473     size_t p, parampos;
 474
 475     /* back up locals */
 476     st.localsp  = prog->localstack_count;
 477     st.stmt     = prog->statement;
 478     st.function = func;
 479
 480 #ifdef QCVM_BACKUP_STRATEGY_CALLER_VARS
 481     if (prog->stack_count)
 482     {
 483         prog_section_function *cur;
 484         cur = prog->stack[prog->stack_count-1].function;
 485         if (cur)
 486         {
 487             qcint *globals = prog->globals + cur->firstlocal;
 488             if (!qc_program_localstack_append(prog, globals, cur->locals))
 489             {
 490                 printf("out of memory\n");
 491                 exit(1);
 492             }
 493         }
 494     }
 495 #else
 496     {
 497         qcint *globals = prog->globals + func->firstlocal;
 498         if (!qc_program_localstack_append(prog, globals, func->locals))
 499         {
 500             printf("out of memory\n");
 501             exit(1);
 502         }
 503     }
 504 #endif
 505
 506     /* copy parameters */
 507     parampos = func->firstlocal;
 508     for (p = 0; p < func->nargs; ++p)
 509     {
 510         size_t s;
 511         for (s = 0; s < func->argsize[p]; ++s) {
 512             prog->globals[parampos] = prog->globals[OFS_PARM0 + 3*p + s];
 513             ++parampos;
 514         }
 515     }
 516
 517     if (!qc_program_stack_add(prog, st)) {
 518         printf("out of memory\n");
 519         exit(1);
 520     }
 521
 522     return func->entry;
 523 }
 524
 525 static qcint prog_leavefunction(qc_program *prog)
 526 {
 527     prog_section_function *prev = NULL;
 528     size_t oldsp;
 529
 530     qc_exec_stack st = prog->stack[prog->stack_count-1];
 531
 532 #ifdef QCVM_BACKUP_STRATEGY_CALLER_VARS
 533     if (prog->stack_count > 1) {
 534         prev  = prog->stack[prog->stack_count-2].function;
 535         oldsp = prog->stack[prog->stack_count-2].localsp;
 536     }
 537 #else
 538     prev  = prog->stack[prog->stack_count-1].function;
 539     oldsp = prog->stack[prog->stack_count-1].localsp;
 540 #endif
 541     if (prev) {
 542         qcint *globals = prog->globals + prev->firstlocal;
 543         memcpy(globals, prog->localstack + oldsp, prev->locals);
 544         if (!qc_program_localstack_resize(prog, oldsp)) {
 545             printf("out of memory\n");
 546             exit(1);
 547         }
 548     }
 549
 550     if (!qc_program_stack_remove(prog, prog->stack_count-1)) {
 551         printf("out of memory\n");
 552         exit(1);
 553     }
 554
 555     return st.stmt - 1; /* offset the ++st */
 556 }
 557
 558 bool prog_exec(qc_program *prog, prog_section_function *func, size_t flags, long maxjumps)
 559 {
 560     long jumpcount = 0;
 561     prog_section_statement *st;
 562
 563     prog->vmerror = 0;
 564
 565     st = prog->code + prog_enterfunction(prog, func);
 566     --st;
 567     switch (flags)
 568     {
 569         default:
 570         case 0:
 571         {
 572 #define QCVM_PROFILE 0
 573 #define QCVM_TRACE   0
 574 #           include "execloop.h"
 575             break;
 576         }
 577         case (VMXF_TRACE):
 578         {
 579 #define QCVM_PROFILE 0
 580 #define QCVM_TRACE   1
 581 #           include "execloop.h"
 582             break;
 583         }
 584         case (VMXF_PROFILE):
 585         {
 586 #define QCVM_PROFILE 1
 587 #define QCVM_TRACE   0
 588 #           include "execloop.h"
 589             break;
 590         }
 591         case (VMXF_TRACE|VMXF_PROFILE):
 592         {
 593 #define QCVM_PROFILE 1
 594 #define QCVM_TRACE   1
 595 #           include "execloop.h"
 596             break;
 597         }
 598     };
 599
 600 cleanup:
 601     prog->localstack_count = 0;
 602     prog->stack_count = 0;
 603     if (prog->vmerror)
 604         return false;
 605     return true;
 606 }
 607
 608 /***********************************************************************
 609  * main for when building the standalone executor
 610  */
 611
 612 #if defined(QCVM_EXECUTOR)
 613 #include <math.h>
 614
 615 const char *type_name[TYPE_COUNT] = {
 616     "void",
 617     "string",
 618     "float",
 619     "vector",
 620     "entity",
 621     "field",
 622     "function",
 623     "pointer",
 624 #if 0
 625     "integer",
 626 #endif
 627     "variant"
 628 };
 629
 630 bool        opts_debug    = false;
 631 bool        opts_memchk   = false;
 632
 633 #define CheckArgs(num) do {                                                    \
 634     if (prog->argc != (num)) {                                                 \
 635         prog->vmerror++;                                                       \
 636         printf("ERROR: invalid number of arguments for %s: %i, expected %i\n", \
 637         __FUNCTION__, prog->argc, (num));                                      \
 638         return -1;                                                             \
 639     }                                                                          \
 640 } while (0)
 641
 642 #define GetGlobal(idx) ((qcany*)(prog->globals + (idx)))
 643 #define GetArg(num) GetGlobal(OFS_PARM0 + 3*(num))
 644 #define Return(any) *(GetGlobal(OFS_RETURN)) = (any)
 645
 646 static int qc_print(qc_program *prog)
 647 {
 648     size_t i;
 649     for (i = 0; i < prog->argc; ++i) {
 650         qcany *str = (qcany*)(prog->globals + OFS_PARM0 + 3*i);
 651         printf("%s", prog_getstring(prog, str->string));
 652     }
 653     return 0;
 654 }
 655
 656 static int qc_error(qc_program *prog)
 657 {
 658     printf("*** VM raised an error:\n");
 659     qc_print(prog);
 660     prog->vmerror++;
 661     return -1;
 662 }
 663
 664 static int qc_ftos(qc_program *prog)
 665 {
 666     char buffer[512];
 667     qcany *num;
 668     qcany str;
 669     CheckArgs(1);
 670     num = GetArg(0);
 671     snprintf(buffer, sizeof(buffer), "%g", num->_float);
 672     str.string = prog_tempstring(prog, buffer);
 673     Return(str);
 674     return 0;
 675 }
 676
 677 static int qc_vtos(qc_program *prog)
 678 {
 679     char buffer[512];
 680     qcany *num;
 681     qcany str;
 682     CheckArgs(1);
 683     num = GetArg(0);
 684     snprintf(buffer, sizeof(buffer), "`%g %g %g`", num->vector[0], num->vector[1], num->vector[2]);
 685     str.string = prog_tempstring(prog, buffer);
 686     Return(str);
 687     return 0;
 688 }
 689
 690 static int qc_spawn(qc_program *prog)
 691 {
 692     qcany ent;
 693     CheckArgs(0);
 694     ent.edict = prog_spawn_entity(prog);
 695     Return(ent);
 696     return (ent.edict ? 0 : -1);
 697 }
 698
 699 static int qc_kill(qc_program *prog)
 700 {
 701     qcany *ent;
 702     CheckArgs(1);
 703     ent = GetArg(0);
 704     prog_free_entity(prog, ent->edict);
 705     return 0;
 706 }
 707
 708 static int qc_vlen(qc_program *prog)
 709 {
 710     qcany *vec, len;
 711     CheckArgs(1);
 712     vec = GetArg(0);
 713     len._float = sqrt(vec->vector[0] * vec->vector[0] +
 714                       vec->vector[1] * vec->vector[1] +
 715                       vec->vector[2] * vec->vector[2]);
 716     Return(len);
 717     return 0;
 718 }
 719
 720 static prog_builtin qc_builtins[] = {
 721     NULL,
 722     &qc_print, /*   1   */
 723     &qc_ftos,  /*   2   */
 724     &qc_spawn, /*   3   */
 725     &qc_kill,  /*   4   */
 726     &qc_vtos,  /*   5   */
 727     &qc_error, /*   6   */
 728     &qc_vlen   /*   7   */
 729 };
 730 static size_t qc_builtins_count = sizeof(qc_builtins) / sizeof(qc_builtins[0]);
 731
 732 static const char *arg0 = NULL;
 733
 734 void usage()
 735 {
 736     printf("usage: [-debug] %s file\n", arg0);
 737     exit(1);
 738 }
 739
 740 int main(int argc, char **argv)
 741 {
 742     size_t      i;
 743     qcint       fnmain = -1;
 744     qc_program *prog;
 745     size_t      xflags = VMXF_DEFAULT;
 746     bool        opts_printfields = false;
 747     bool        opts_printdefs   = false;
 748     bool        opts_info  = false;
 749
 750     arg0 = argv[0];
 751
 752     if (argc < 2)
 753         usage();
 754
 755     while (argc > 2) {
 756         if (!strcmp(argv[1], "-trace")) {
 757             --argc;
 758             ++argv;
 759             xflags |= VMXF_TRACE;
 760         }
 761         else if (!strcmp(argv[1], "-profile")) {
 762             --argc;
 763             ++argv;
 764             xflags |= VMXF_PROFILE;
 765         }
 766         else if (!strcmp(argv[1], "-info")) {
 767             --argc;
 768             ++argv;
 769             opts_info = true;
 770         }
 771         else if (!strcmp(argv[1], "-printdefs")) {
 772             --argc;
 773             ++argv;
 774             opts_printdefs = true;
 775         }
 776         else if (!strcmp(argv[1], "-printfields")) {
 777             --argc;
 778             ++argv;
 779             opts_printfields = true;
 780         }
 781         else
 782             usage();
 783     }
 784
 785
 786     prog = prog_load(argv[1]);
 787     if (!prog) {
 788         printf("failed to load program '%s'\n", argv[1]);
 789         exit(1);
 790     }
 791
 792     prog->builtins       = qc_builtins;
 793     prog->builtins_count = qc_builtins_count;
 794     prog->builtins_alloc = 0;
 795
 796     printf("Program's system-checksum = 0x%04x\n", (int)prog->crc16);
 797
 798     for (i = 1; i < prog->functions_count; ++i) {
 799         const char *name = prog_getstring(prog, prog->functions[i].name);
 800         /* printf("Found function: %s\n", name); */
 801         if (!strcmp(name, "main"))
 802             fnmain = (qcint)i;
 803     }
 804     printf("Entity field space: %i\n", (int)prog->entityfields);
 805     if (opts_info) {
 806         prog_delete(prog);
 807         return 0;
 808     }
 809     if (opts_printdefs) {
 810         for (i = 0; i < prog->defs_count; ++i) {
 811             printf("Global: %8s %-16s at %u\n",
 812                    type_name[prog->defs[i].type],
 813                    prog_getstring(prog, prog->defs[i].name),
 814                    (unsigned int)prog->defs[i].offset);
 815         }
 816     }
 817     else if (opts_printfields) {
 818         for (i = 0; i < prog->fields_count; ++i) {
 819             printf("Field: %8s %-16s at %u\n",
 820                    type_name[prog->fields[i].type],
 821                    prog_getstring(prog, prog->fields[i].name),
 822                    (unsigned int)prog->fields[i].offset);
 823         }
 824     }
 825     else
 826     {
 827         if (fnmain > 0)
 828         {
 829             prog_exec(prog, &prog->functions[fnmain], xflags, VM_JUMPS_DEFAULT);
 830         }
 831         else
 832             printf("No main function found\n");
 833     }
 834
 835     prog_delete(prog);
 836     return 0;
 837 }
 838 #endif