# squirrel.cpp

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    00001 /* $Id: squirrel.cpp 25339 2013-06-09 09:33:06Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #include <stdarg.h>
    00013 #include "../stdafx.h"
    00014 #include "../debug.h"
    00015 #include "squirrel_std.hpp"
    00016 #include "../fileio_func.h"
    00017 #include <sqstdaux.h>
    00018 #include <../squirrel/sqpcheader.h>
    00019 #include <../squirrel/sqvm.h>
    00020
    00021 void Squirrel::CompileError(HSQUIRRELVM vm, const SQChar *desc, const SQChar *source, SQInteger line, SQInteger column)
    00022 {
    00023   SQChar buf[1024];
    00024
    00025 #ifdef _SQ64
    00026   scsnprintf(buf, lengthof(buf), _SC("Error %s:%ld/%ld: %s"), source, line, column, desc);
    00027 #else
    00028   scsnprintf(buf, lengthof(buf), _SC("Error %s:%d/%d: %s"), source, line, column, desc);
    00029 #endif
    00030
    00031   /* Check if we have a custom print function */
    00032   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00033   engine->crashed = true;
    00034   SQPrintFunc *func = engine->print_func;
    00035   if (func == NULL) {
    00036     DEBUG(misc, 0, "[Squirrel] Compile error: %s", SQ2OTTD(buf));
    00037   } else {
    00038     (*func)(true, buf);
    00039   }
    00040 }
    00041
    00042 void Squirrel::ErrorPrintFunc(HSQUIRRELVM vm, const SQChar *s, ...)
    00043 {
    00044   va_list arglist;
    00045   SQChar buf[1024];
    00046
    00047   va_start(arglist, s);
    00048   scvsnprintf(buf, lengthof(buf), s, arglist);
    00049   va_end(arglist);
    00050
    00051   /* Check if we have a custom print function */
    00052   SQPrintFunc *func = ((Squirrel *)sq_getforeignptr(vm))->print_func;
    00053   if (func == NULL) {
    00054     scfprintf(stderr, _SC("%s"), buf);
    00055   } else {
    00056     (*func)(true, buf);
    00057   }
    00058 }
    00059
    00060 void Squirrel::RunError(HSQUIRRELVM vm, const SQChar *error)
    00061 {
    00062   /* Set the print function to something that prints to stderr */
    00063   SQPRINTFUNCTION pf = sq_getprintfunc(vm);
    00064   sq_setprintfunc(vm, &Squirrel::ErrorPrintFunc);
    00065
    00066   /* Check if we have a custom print function */
    00067   SQChar buf[1024];
    00068   scsnprintf(buf, lengthof(buf), _SC("Your script made an error: %s\n"), error);
    00069   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00070   SQPrintFunc *func = engine->print_func;
    00071   if (func == NULL) {
    00072     scfprintf(stderr, _SC("%s"), buf);
    00073   } else {
    00074     (*func)(true, buf);
    00075   }
    00076
    00077   /* Print below the error the stack, so the users knows what is happening */
    00078   sqstd_printcallstack(vm);
    00079   /* Reset the old print function */
    00080   sq_setprintfunc(vm, pf);
    00081 }
    00082
    00083 SQInteger Squirrel::_RunError(HSQUIRRELVM vm)
    00084 {
    00085   const SQChar *sErr = 0;
    00086
    00087   if (sq_gettop(vm) >= 1) {
    00088     if (SQ_SUCCEEDED(sq_getstring(vm, -1, &sErr))) {
    00089       Squirrel::RunError(vm, sErr);
    00090       return 0;
    00091     }
    00092   }
    00093
    00094   Squirrel::RunError(vm, _SC("unknown error"));
    00095   return 0;
    00096 }
    00097
    00098 void Squirrel::PrintFunc(HSQUIRRELVM vm, const SQChar *s, ...)
    00099 {
    00100   va_list arglist;
    00101   SQChar buf[1024];
    00102
    00103   va_start(arglist, s);
    00104   scvsnprintf(buf, lengthof(buf) - 2, s, arglist);
    00105   va_end(arglist);
    00106   scstrcat(buf, _SC("\n"));
    00107
    00108   /* Check if we have a custom print function */
    00109   SQPrintFunc *func = ((Squirrel *)sq_getforeignptr(vm))->print_func;
    00110   if (func == NULL) {
    00111     scprintf(_SC("%s"), buf);
    00112   } else {
    00113     (*func)(false, buf);
    00114   }
    00115 }
    00116
    00117 void Squirrel::AddMethod(const char *method_name, SQFUNCTION proc, uint nparam, const char *params, void *userdata, int size)
    00118 {
    00119   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00120
    00121   if (size != 0) {
    00122     void *ptr = sq_newuserdata(vm, size);
    00123     memcpy(ptr, userdata, size);
    00124   }
    00125
    00126   sq_newclosure(this->vm, proc, size != 0 ? 1 : 0);
    00127   if (nparam != 0) sq_setparamscheck(this->vm, nparam, OTTD2SQ(params));
    00128   sq_setnativeclosurename(this->vm, -1, OTTD2SQ(method_name));
    00129   sq_newslot(this->vm, -3, SQFalse);
    00130 }
    00131
    00132 void Squirrel::AddConst(const char *var_name, int value)
    00133 {
    00134   sq_pushstring(this->vm, OTTD2SQ(var_name), -1);
    00135   sq_pushinteger(this->vm, value);
    00136   sq_newslot(this->vm, -3, SQTrue);
    00137 }
    00138
    00139 void Squirrel::AddConst(const char *var_name, bool value)
    00140 {
    00141   sq_pushstring(this->vm, OTTD2SQ(var_name), -1);
    00142   sq_pushbool(this->vm, value);
    00143   sq_newslot(this->vm, -3, SQTrue);
    00144 }
    00145
    00146 void Squirrel::AddClassBegin(const char *class_name)
    00147 {
    00148   sq_pushroottable(this->vm);
    00149   sq_pushstring(this->vm, OTTD2SQ(class_name), -1);
    00150   sq_newclass(this->vm, SQFalse);
    00151 }
    00152
    00153 void Squirrel::AddClassBegin(const char *class_name, const char *parent_class)
    00154 {
    00155   sq_pushroottable(this->vm);
    00156   sq_pushstring(this->vm, OTTD2SQ(class_name), -1);
    00157   sq_pushstring(this->vm, OTTD2SQ(parent_class), -1);
    00158   if (SQ_FAILED(sq_get(this->vm, -3))) {
    00159     DEBUG(misc, 0, "[squirrel] Failed to initialize class '%s' based on parent class '%s'", class_name, parent_class);
    00160     DEBUG(misc, 0, "[squirrel] Make sure that '%s' exists before trying to define '%s'", parent_class, class_name);
    00161     return;
    00162   }
    00163   sq_newclass(this->vm, SQTrue);
    00164 }
    00165
    00166 void Squirrel::AddClassEnd()
    00167 {
    00168   sq_newslot(vm, -3, SQFalse);
    00169   sq_pop(vm, 1);
    00170 }
    00171
    00172 bool Squirrel::MethodExists(HSQOBJECT instance, const char *method_name)
    00173 {
    00174   assert(!this->crashed);
    00175   int top = sq_gettop(this->vm);
    00176   /* Go to the instance-root */
    00177   sq_pushobject(this->vm, instance);
    00178   /* Find the function-name inside the script */
    00179   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00180   if (SQ_FAILED(sq_get(this->vm, -2))) {
    00181     sq_settop(this->vm, top);
    00182     return false;
    00183   }
    00184   sq_settop(this->vm, top);
    00185   return true;
    00186 }
    00187
    00188 bool Squirrel::Resume(int suspend)
    00189 {
    00190   assert(!this->crashed);
    00191   /* Did we use more operations than we should have in the
    00192    * previous tick? If so, subtract that from the current run. */
    00193   if (this->overdrawn_ops > 0 && suspend > 0) {
    00194     this->overdrawn_ops -= suspend;
    00195     /* Do we need to wait even more? */
    00196     if (this->overdrawn_ops >= 0) return true;
    00197
    00198     /* We can now only run whatever is "left". */
    00199     suspend = -this->overdrawn_ops;
    00200   }
    00201
    00202   this->crashed = !sq_resumecatch(this->vm, suspend);
    00203   this->overdrawn_ops = -this->vm->_ops_till_suspend;
    00204   return this->vm->_suspended != 0;
    00205 }
    00206
    00207 void Squirrel::ResumeError()
    00208 {
    00209   assert(!this->crashed);
    00210   sq_resumeerror(this->vm);
    00211 }
    00212
    00213 void Squirrel::CollectGarbage()
    00214 {
    00215   sq_collectgarbage(this->vm);
    00216 }
    00217
    00218 bool Squirrel::CallMethod(HSQOBJECT instance, const char *method_name, HSQOBJECT *ret, int suspend)
    00219 {
    00220   assert(!this->crashed);
    00221   /* Store the stack-location for the return value. We need to
    00222    * restore this after saving or the stack will be corrupted
    00223    * if we're in the middle of a DoCommand. */
    00224   SQInteger last_target = this->vm->_suspended_target;
    00225   /* Store the current top */
    00226   int top = sq_gettop(this->vm);
    00227   /* Go to the instance-root */
    00228   sq_pushobject(this->vm, instance);
    00229   /* Find the function-name inside the script */
    00230   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00231   if (SQ_FAILED(sq_get(this->vm, -2))) {
    00232     DEBUG(misc, 0, "[squirrel] Could not find '%s' in the class", method_name);
    00233     sq_settop(this->vm, top);
    00234     return false;
    00235   }
    00236   /* Call the method */
    00237   sq_pushobject(this->vm, instance);
    00238   if (SQ_FAILED(sq_call(this->vm, 1, ret == NULL ? SQFalse : SQTrue, SQTrue, suspend))) return false;
    00239   if (ret != NULL) sq_getstackobj(vm, -1, ret);
    00240   /* Reset the top, but don't do so for the script main function, as we need
    00241    *  a correct stack when resuming. */
    00242   if (suspend == -1 || !this->IsSuspended()) sq_settop(this->vm, top);
    00243   /* Restore the return-value location. */
    00244   this->vm->_suspended_target = last_target;
    00245
    00246   return true;
    00247 }
    00248
    00249 bool Squirrel::CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, const char **res, int suspend)
    00250 {
    00251   HSQOBJECT ret;
    00252   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00253   if (ret._type != OT_STRING) return false;
    00254   *res = strdup(ObjectToString(&ret));
    00255   return true;
    00256 }
    00257
    00258 bool Squirrel::CallIntegerMethod(HSQOBJECT instance, const char *method_name, int *res, int suspend)
    00259 {
    00260   HSQOBJECT ret;
    00261   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00262   if (ret._type != OT_INTEGER) return false;
    00263   *res = ObjectToInteger(&ret);
    00264   return true;
    00265 }
    00266
    00267 bool Squirrel::CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend)
    00268 {
    00269   HSQOBJECT ret;
    00270   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00271   if (ret._type != OT_BOOL) return false;
    00272   *res = ObjectToBool(&ret);
    00273   return true;
    00274 }
    00275
    00276 /* static */ bool Squirrel::CreateClassInstanceVM(HSQUIRRELVM vm, const char *class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook, bool prepend_API_name)
    00277 {
    00278   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00279
    00280   int oldtop = sq_gettop(vm);
    00281
    00282   /* First, find the class */
    00283   sq_pushroottable(vm);
    00284
    00285   if (prepend_API_name) {
    00286     char *class_name2 = (char *)alloca(strlen(class_name) + strlen(engine->GetAPIName()) + 1);
    00287     sprintf(class_name2, "%s%s", engine->GetAPIName(), class_name);
    00288
    00289     sq_pushstring(vm, OTTD2SQ(class_name2), -1);
    00290   } else {
    00291     sq_pushstring(vm, OTTD2SQ(class_name), -1);
    00292   }
    00293
    00294   if (SQ_FAILED(sq_get(vm, -2))) {
    00295     DEBUG(misc, 0, "[squirrel] Failed to find class by the name '%s%s'", prepend_API_name ? engine->GetAPIName() : "", class_name);
    00296     sq_settop(vm, oldtop);
    00297     return false;
    00298   }
    00299
    00300   /* Create the instance */
    00301   if (SQ_FAILED(sq_createinstance(vm, -1))) {
    00302     DEBUG(misc, 0, "[squirrel] Failed to create instance for class '%s%s'", prepend_API_name ? engine->GetAPIName() : "", class_name);
    00303     sq_settop(vm, oldtop);
    00304     return false;
    00305   }
    00306
    00307   if (instance != NULL) {
    00308     /* Find our instance */
    00309     sq_getstackobj(vm, -1, instance);
    00310     /* Add a reference to it, so it survives for ever */
    00311     sq_addref(vm, instance);
    00312   }
    00313   sq_remove(vm, -2); // Class-name
    00314   sq_remove(vm, -2); // Root-table
    00315
    00316   /* Store it in the class */
    00317   sq_setinstanceup(vm, -1, real_instance);
    00318   if (release_hook != NULL) sq_setreleasehook(vm, -1, release_hook);
    00319
    00320   if (instance != NULL) sq_settop(vm, oldtop);
    00321
    00322   return true;
    00323 }
    00324
    00325 bool Squirrel::CreateClassInstance(const char *class_name, void *real_instance, HSQOBJECT *instance)
    00326 {
    00327   return Squirrel::CreateClassInstanceVM(this->vm, class_name, real_instance, instance, NULL);
    00328 }
    00329
    00330 Squirrel::Squirrel(const char *APIName) :
    00331   global_pointer(NULL),
    00332   print_func(NULL),
    00333   crashed(false),
    00334   overdrawn_ops(0),
    00335   APIName(APIName)
    00336 {
    00337   this->vm = sq_open(1024);
    00338
    00339   /* Handle compile-errors ourself, so we can display it nicely */
    00340   sq_setcompilererrorhandler(this->vm, &Squirrel::CompileError);
    00341   sq_notifyallexceptions(this->vm, SQTrue);
    00342   /* Set a good print-function */
    00343   sq_setprintfunc(this->vm, &Squirrel::PrintFunc);
    00344   /* Handle runtime-errors ourself, so we can display it nicely */
    00345   sq_newclosure(this->vm, &Squirrel::_RunError, 0);
    00346   sq_seterrorhandler(this->vm);
    00347
    00348   /* Set the foreign pointer, so we can always find this instance from within the VM */
    00349   sq_setforeignptr(this->vm, this);
    00350
    00351   sq_pushroottable(this->vm);
    00352   squirrel_register_global_std(this);
    00353 }
    00354
    00355 class SQFile {
    00356 private:
    00357   FILE *file;
    00358   size_t size;
    00359   size_t pos;
    00360
    00361 public:
    00362   SQFile(FILE *file, size_t size) : file(file), size(size), pos(0) {}
    00363
    00364   size_t Read(void *buf, size_t elemsize, size_t count)
    00365   {
    00366     assert(elemsize != 0);
    00367     if (this->pos + (elemsize * count) > this->size) {
    00368       count = (this->size - this->pos) / elemsize;
    00369     }
    00370     if (count == 0) return 0;
    00371     size_t ret = fread(buf, elemsize, count, this->file);
    00372     this->pos += ret * elemsize;
    00373     return ret;
    00374   }
    00375 };
    00376
    00377 static SQInteger _io_file_lexfeed_ASCII(SQUserPointer file)
    00378 {
    00379   char c;
    00380   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) return c;
    00381   return 0;
    00382 }
    00383
    00384 static SQInteger _io_file_lexfeed_UTF8(SQUserPointer file)
    00385 {
    00386   static const SQInteger utf8_lengths[16] =
    00387   {
    00388     1, 1, 1, 1, 1, 1, 1, 1, /* 0000 to 0111 : 1 byte (plain ASCII) */
    00389     0, 0, 0, 0,             /* 1000 to 1011 : not valid */
    00390     2, 2,                   /* 1100, 1101 : 2 bytes */
    00391     3,                      /* 1110 : 3 bytes */
    00392     4                       /* 1111 : 4 bytes */
    00393   };
    00394   static unsigned char byte_masks[5] = {0, 0, 0x1F, 0x0F, 0x07};
    00395   unsigned char inchar;
    00396   SQInteger c = 0;
    00397   if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
    00398   c = inchar;
    00399
    00400   if (c >= 0x80) {
    00401     SQInteger tmp;
    00402     SQInteger codelen = utf8_lengths[c >> 4];
    00403     if (codelen == 0) return 0;
    00404
    00405     tmp = c & byte_masks[codelen];
    00406     for (SQInteger n = 0; n < codelen - 1; n++) {
    00407       tmp <<= 6;
    00408       if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
    00409       tmp |= inchar & 0x3F;
    00410     }
    00411     c = tmp;
    00412   }
    00413   return c;
    00414 }
    00415
    00416 static SQInteger _io_file_lexfeed_UCS2_no_swap(SQUserPointer file)
    00417 {
    00418   wchar_t c;
    00419   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) return (SQChar)c;
    00420   return 0;
    00421 }
    00422
    00423 static SQInteger _io_file_lexfeed_UCS2_swap(SQUserPointer file)
    00424 {
    00425   unsigned short c;
    00426   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) {
    00427     c = ((c >> 8) & 0x00FF)| ((c << 8) & 0xFF00);
    00428     return (SQChar)c;
    00429   }
    00430   return 0;
    00431 }
    00432
    00433 static SQInteger _io_file_read(SQUserPointer file, SQUserPointer buf, SQInteger size)
    00434 {
    00435   SQInteger ret = ((SQFile *)file)->Read(buf, 1, size);
    00436   if (ret == 0) return -1;
    00437   return ret;
    00438 }
    00439
    00440 SQRESULT Squirrel::LoadFile(HSQUIRRELVM vm, const char *filename, SQBool printerror)
    00441 {
    00442   size_t size;
    00443   FILE *file;
    00444   SQInteger ret;
    00445   unsigned short us;
    00446   unsigned char uc;
    00447   SQLEXREADFUNC func;
    00448
    00449   if (strncmp(this->GetAPIName(), "AI", 2) == 0) {
    00450     file = FioFOpenFile(filename, "rb", AI_DIR, &size);
    00451     if (file == NULL) file = FioFOpenFile(filename, "rb", AI_LIBRARY_DIR, &size);
    00452   } else if (strncmp(this->GetAPIName(), "GS", 2) == 0) {
    00453     file = FioFOpenFile(filename, "rb", GAME_DIR, &size);
    00454     if (file == NULL) file = FioFOpenFile(filename, "rb", GAME_LIBRARY_DIR, &size);
    00455   } else {
    00456     NOT_REACHED();
    00457   }
    00458
    00459   if (file != NULL) {
    00460     SQFile f(file, size);
    00461     ret = fread(&us, 1, sizeof(us), file);
    00462     /* Most likely an empty file */
    00463     if (ret != 2) us = 0;
    00464
    00465     switch (us) {
    00466       case SQ_BYTECODE_STREAM_TAG: { // BYTECODE
    00467         fseek(file, -2, SEEK_CUR);
    00468         if (SQ_SUCCEEDED(sq_readclosure(vm, _io_file_read, &f))) {
    00469           FioFCloseFile(file);
    00470           return SQ_OK;
    00471         }
    00472         FioFCloseFile(file);
    00473         return sq_throwerror(vm, _SC("Couldn't read bytecode"));
    00474       }
    00475       case 0xFFFE:
    00476         /* Either this file is encoded as big-endian and we're on a little-endian
    00477          * machine, or this file is encoded as little-endian and we're on a big-endian
    00478          * machine. Either way, swap the bytes of every word we read. */
    00479         func = _io_file_lexfeed_UCS2_swap;
    00480         break;
    00481       case 0xFEFF: func = _io_file_lexfeed_UCS2_no_swap; break;
    00482       case 0xBBEF: // UTF-8
    00483       case 0xEFBB: // UTF-8 on big-endian machine
    00484         if (fread(&uc, 1, sizeof(uc), file) == 0) {
    00485           FioFCloseFile(file);
    00486           return sq_throwerror(vm, _SC("I/O error"));
    00487         }
    00488         if (uc != 0xBF) {
    00489           FioFCloseFile(file);
    00490           return sq_throwerror(vm, _SC("Unrecognized encoding"));
    00491         }
    00492         func = _io_file_lexfeed_UTF8;
    00493         break;
    00494       default: func = _io_file_lexfeed_ASCII; fseek(file, -2, SEEK_CUR); break; // ASCII
    00495     }
    00496
    00497     if (SQ_SUCCEEDED(sq_compile(vm, func, &f, OTTD2SQ(filename), printerror))) {
    00498       FioFCloseFile(file);
    00499       return SQ_OK;
    00500     }
    00501     FioFCloseFile(file);
    00502     return SQ_ERROR;
    00503   }
    00504   return sq_throwerror(vm, _SC("cannot open the file"));
    00505 }
    00506
    00507 bool Squirrel::LoadScript(HSQUIRRELVM vm, const char *script, bool in_root)
    00508 {
    00509   /* Make sure we are always in the root-table */
    00510   if (in_root) sq_pushroottable(vm);
    00511
    00512   SQInteger ops_left = vm->_ops_till_suspend;
    00513   /* Load and run the script */
    00514   if (SQ_SUCCEEDED(LoadFile(vm, script, SQTrue))) {
    00515     sq_push(vm, -2);
    00516     if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue, 100000))) {
    00517       sq_pop(vm, 1);
    00518       /* After compiling the file we want to reset the amount of opcodes. */
    00519       vm->_ops_till_suspend = ops_left;
    00520       return true;
    00521     }
    00522   }
    00523
    00524   vm->_ops_till_suspend = ops_left;
    00525   DEBUG(misc, 0, "[squirrel] Failed to compile '%s'", script);
    00526   return false;
    00527 }
    00528
    00529 bool Squirrel::LoadScript(const char *script)
    00530 {
    00531   return LoadScript(this->vm, script);
    00532 }
    00533
    00534 Squirrel::~Squirrel()
    00535 {
    00536   /* Clean up the stuff */
    00537   sq_pop(this->vm, 1);
    00538   sq_close(this->vm);
    00539 }
    00540
    00541 void Squirrel::InsertResult(bool result)
    00542 {
    00543   sq_pushbool(this->vm, result);
    00544   if (this->IsSuspended()) { // Called before resuming a suspended script?
    00545     vm->GetAt(vm->_stackbase + vm->_suspended_target) = vm->GetUp(-1);
    00546     vm->Pop();
    00547   }
    00548 }
    00549
    00550 void Squirrel::InsertResult(int result)
    00551 {
    00552   sq_pushinteger(this->vm, result);
    00553   if (this->IsSuspended()) { // Called before resuming a suspended script?
    00554     vm->GetAt(vm->_stackbase + vm->_suspended_target) = vm->GetUp(-1);
    00555     vm->Pop();
    00556   }
    00557 }
    00558
    00559 /* static */ void Squirrel::DecreaseOps(HSQUIRRELVM vm, int ops)
    00560 {
    00561   vm->DecreaseOps(ops);
    00562 }
    00563
    00564 bool Squirrel::IsSuspended()
    00565 {
    00566   return this->vm->_suspended != 0;
    00567 }
    00568
    00569 bool Squirrel::HasScriptCrashed()
    00570 {
    00571   return this->crashed;
    00572 }
    00573
    00574 void Squirrel::ResetCrashed()
    00575 {
    00576   this->crashed = false;
    00577 }
    00578
    00579 void Squirrel::CrashOccurred()
    00580 {
    00581   this->crashed = true;
    00582 }
    00583
    00584 bool Squirrel::CanSuspend()
    00585 {
    00586   return sq_can_suspend(this->vm);
    00587 }
    00588
    00589 SQInteger Squirrel::GetOpsTillSuspend()
    00590 {
    00591   return this->vm->_ops_till_suspend;
    00592 }