# squirrel.cpp

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    00001 /* $Id: squirrel.cpp 26113 2013-11-25 16:42:35Z 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 "../string_func.h"
    00018 #include <sqstdaux.h>
    00019 #include <../squirrel/sqpcheader.h>
    00020 #include <../squirrel/sqvm.h>
    00021
    00022 void Squirrel::CompileError(HSQUIRRELVM vm, const SQChar *desc, const SQChar *source, SQInteger line, SQInteger column)
    00023 {
    00024   SQChar buf[1024];
    00025
    00026 #ifdef _SQ64
    00027   scsnprintf(buf, lengthof(buf), _SC("Error %s:%ld/%ld: %s"), source, line, column, desc);
    00028 #else
    00029   scsnprintf(buf, lengthof(buf), _SC("Error %s:%d/%d: %s"), source, line, column, desc);
    00030 #endif
    00031
    00032   /* Check if we have a custom print function */
    00033   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00034   engine->crashed = true;
    00035   SQPrintFunc *func = engine->print_func;
    00036   if (func == NULL) {
    00037     DEBUG(misc, 0, "[Squirrel] Compile error: %s", SQ2OTTD(buf));
    00038   } else {
    00039     (*func)(true, buf);
    00040   }
    00041 }
    00042
    00043 void Squirrel::ErrorPrintFunc(HSQUIRRELVM vm, const SQChar *s, ...)
    00044 {
    00045   va_list arglist;
    00046   SQChar buf[1024];
    00047
    00048   va_start(arglist, s);
    00049   scvsnprintf(buf, lengthof(buf), s, arglist);
    00050   va_end(arglist);
    00051
    00052   /* Check if we have a custom print function */
    00053   SQPrintFunc *func = ((Squirrel *)sq_getforeignptr(vm))->print_func;
    00054   if (func == NULL) {
    00055     scfprintf(stderr, _SC("%s"), buf);
    00056   } else {
    00057     (*func)(true, buf);
    00058   }
    00059 }
    00060
    00061 void Squirrel::RunError(HSQUIRRELVM vm, const SQChar *error)
    00062 {
    00063   /* Set the print function to something that prints to stderr */
    00064   SQPRINTFUNCTION pf = sq_getprintfunc(vm);
    00065   sq_setprintfunc(vm, &Squirrel::ErrorPrintFunc);
    00066
    00067   /* Check if we have a custom print function */
    00068   SQChar buf[1024];
    00069   scsnprintf(buf, lengthof(buf), _SC("Your script made an error: %s\n"), error);
    00070   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00071   SQPrintFunc *func = engine->print_func;
    00072   if (func == NULL) {
    00073     scfprintf(stderr, _SC("%s"), buf);
    00074   } else {
    00075     (*func)(true, buf);
    00076   }
    00077
    00078   /* Print below the error the stack, so the users knows what is happening */
    00079   sqstd_printcallstack(vm);
    00080   /* Reset the old print function */
    00081   sq_setprintfunc(vm, pf);
    00082 }
    00083
    00084 SQInteger Squirrel::_RunError(HSQUIRRELVM vm)
    00085 {
    00086   const SQChar *sErr = 0;
    00087
    00088   if (sq_gettop(vm) >= 1) {
    00089     if (SQ_SUCCEEDED(sq_getstring(vm, -1, &sErr))) {
    00090       Squirrel::RunError(vm, sErr);
    00091       return 0;
    00092     }
    00093   }
    00094
    00095   Squirrel::RunError(vm, _SC("unknown error"));
    00096   return 0;
    00097 }
    00098
    00099 void Squirrel::PrintFunc(HSQUIRRELVM vm, const SQChar *s, ...)
    00100 {
    00101   va_list arglist;
    00102   SQChar buf[1024];
    00103
    00104   va_start(arglist, s);
    00105   scvsnprintf(buf, lengthof(buf) - 2, s, arglist);
    00106   va_end(arglist);
    00107   scstrcat(buf, _SC("\n"));
    00108
    00109   /* Check if we have a custom print function */
    00110   SQPrintFunc *func = ((Squirrel *)sq_getforeignptr(vm))->print_func;
    00111   if (func == NULL) {
    00112     scprintf(_SC("%s"), buf);
    00113   } else {
    00114     (*func)(false, buf);
    00115   }
    00116 }
    00117
    00118 void Squirrel::AddMethod(const char *method_name, SQFUNCTION proc, uint nparam, const char *params, void *userdata, int size)
    00119 {
    00120   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00121
    00122   if (size != 0) {
    00123     void *ptr = sq_newuserdata(vm, size);
    00124     memcpy(ptr, userdata, size);
    00125   }
    00126
    00127   sq_newclosure(this->vm, proc, size != 0 ? 1 : 0);
    00128   if (nparam != 0) sq_setparamscheck(this->vm, nparam, OTTD2SQ(params));
    00129   sq_setnativeclosurename(this->vm, -1, OTTD2SQ(method_name));
    00130   sq_newslot(this->vm, -3, SQFalse);
    00131 }
    00132
    00133 void Squirrel::AddConst(const char *var_name, int value)
    00134 {
    00135   sq_pushstring(this->vm, OTTD2SQ(var_name), -1);
    00136   sq_pushinteger(this->vm, value);
    00137   sq_newslot(this->vm, -3, SQTrue);
    00138 }
    00139
    00140 void Squirrel::AddConst(const char *var_name, bool value)
    00141 {
    00142   sq_pushstring(this->vm, OTTD2SQ(var_name), -1);
    00143   sq_pushbool(this->vm, value);
    00144   sq_newslot(this->vm, -3, SQTrue);
    00145 }
    00146
    00147 void Squirrel::AddClassBegin(const char *class_name)
    00148 {
    00149   sq_pushroottable(this->vm);
    00150   sq_pushstring(this->vm, OTTD2SQ(class_name), -1);
    00151   sq_newclass(this->vm, SQFalse);
    00152 }
    00153
    00154 void Squirrel::AddClassBegin(const char *class_name, const char *parent_class)
    00155 {
    00156   sq_pushroottable(this->vm);
    00157   sq_pushstring(this->vm, OTTD2SQ(class_name), -1);
    00158   sq_pushstring(this->vm, OTTD2SQ(parent_class), -1);
    00159   if (SQ_FAILED(sq_get(this->vm, -3))) {
    00160     DEBUG(misc, 0, "[squirrel] Failed to initialize class '%s' based on parent class '%s'", class_name, parent_class);
    00161     DEBUG(misc, 0, "[squirrel] Make sure that '%s' exists before trying to define '%s'", parent_class, class_name);
    00162     return;
    00163   }
    00164   sq_newclass(this->vm, SQTrue);
    00165 }
    00166
    00167 void Squirrel::AddClassEnd()
    00168 {
    00169   sq_newslot(vm, -3, SQFalse);
    00170   sq_pop(vm, 1);
    00171 }
    00172
    00173 bool Squirrel::MethodExists(HSQOBJECT instance, const char *method_name)
    00174 {
    00175   assert(!this->crashed);
    00176   int top = sq_gettop(this->vm);
    00177   /* Go to the instance-root */
    00178   sq_pushobject(this->vm, instance);
    00179   /* Find the function-name inside the script */
    00180   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00181   if (SQ_FAILED(sq_get(this->vm, -2))) {
    00182     sq_settop(this->vm, top);
    00183     return false;
    00184   }
    00185   sq_settop(this->vm, top);
    00186   return true;
    00187 }
    00188
    00189 bool Squirrel::Resume(int suspend)
    00190 {
    00191   assert(!this->crashed);
    00192   /* Did we use more operations than we should have in the
    00193    * previous tick? If so, subtract that from the current run. */
    00194   if (this->overdrawn_ops > 0 && suspend > 0) {
    00195     this->overdrawn_ops -= suspend;
    00196     /* Do we need to wait even more? */
    00197     if (this->overdrawn_ops >= 0) return true;
    00198
    00199     /* We can now only run whatever is "left". */
    00200     suspend = -this->overdrawn_ops;
    00201   }
    00202
    00203   this->crashed = !sq_resumecatch(this->vm, suspend);
    00204   this->overdrawn_ops = -this->vm->_ops_till_suspend;
    00205   return this->vm->_suspended != 0;
    00206 }
    00207
    00208 void Squirrel::ResumeError()
    00209 {
    00210   assert(!this->crashed);
    00211   sq_resumeerror(this->vm);
    00212 }
    00213
    00214 void Squirrel::CollectGarbage()
    00215 {
    00216   sq_collectgarbage(this->vm);
    00217 }
    00218
    00219 bool Squirrel::CallMethod(HSQOBJECT instance, const char *method_name, HSQOBJECT *ret, int suspend)
    00220 {
    00221   assert(!this->crashed);
    00222   /* Store the stack-location for the return value. We need to
    00223    * restore this after saving or the stack will be corrupted
    00224    * if we're in the middle of a DoCommand. */
    00225   SQInteger last_target = this->vm->_suspended_target;
    00226   /* Store the current top */
    00227   int top = sq_gettop(this->vm);
    00228   /* Go to the instance-root */
    00229   sq_pushobject(this->vm, instance);
    00230   /* Find the function-name inside the script */
    00231   sq_pushstring(this->vm, OTTD2SQ(method_name), -1);
    00232   if (SQ_FAILED(sq_get(this->vm, -2))) {
    00233     DEBUG(misc, 0, "[squirrel] Could not find '%s' in the class", method_name);
    00234     sq_settop(this->vm, top);
    00235     return false;
    00236   }
    00237   /* Call the method */
    00238   sq_pushobject(this->vm, instance);
    00239   if (SQ_FAILED(sq_call(this->vm, 1, ret == NULL ? SQFalse : SQTrue, SQTrue, suspend))) return false;
    00240   if (ret != NULL) sq_getstackobj(vm, -1, ret);
    00241   /* Reset the top, but don't do so for the script main function, as we need
    00242    *  a correct stack when resuming. */
    00243   if (suspend == -1 || !this->IsSuspended()) sq_settop(this->vm, top);
    00244   /* Restore the return-value location. */
    00245   this->vm->_suspended_target = last_target;
    00246
    00247   return true;
    00248 }
    00249
    00250 bool Squirrel::CallStringMethodStrdup(HSQOBJECT instance, const char *method_name, const char **res, int suspend)
    00251 {
    00252   HSQOBJECT ret;
    00253   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00254   if (ret._type != OT_STRING) return false;
    00255   *res = strdup(ObjectToString(&ret));
    00256   ValidateString(*res);
    00257   return true;
    00258 }
    00259
    00260 bool Squirrel::CallIntegerMethod(HSQOBJECT instance, const char *method_name, int *res, int suspend)
    00261 {
    00262   HSQOBJECT ret;
    00263   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00264   if (ret._type != OT_INTEGER) return false;
    00265   *res = ObjectToInteger(&ret);
    00266   return true;
    00267 }
    00268
    00269 bool Squirrel::CallBoolMethod(HSQOBJECT instance, const char *method_name, bool *res, int suspend)
    00270 {
    00271   HSQOBJECT ret;
    00272   if (!this->CallMethod(instance, method_name, &ret, suspend)) return false;
    00273   if (ret._type != OT_BOOL) return false;
    00274   *res = ObjectToBool(&ret);
    00275   return true;
    00276 }
    00277
    00278 /* static */ bool Squirrel::CreateClassInstanceVM(HSQUIRRELVM vm, const char *class_name, void *real_instance, HSQOBJECT *instance, SQRELEASEHOOK release_hook, bool prepend_API_name)
    00279 {
    00280   Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
    00281
    00282   int oldtop = sq_gettop(vm);
    00283
    00284   /* First, find the class */
    00285   sq_pushroottable(vm);
    00286
    00287   if (prepend_API_name) {
    00288     char *class_name2 = (char *)alloca(strlen(class_name) + strlen(engine->GetAPIName()) + 1);
    00289     sprintf(class_name2, "%s%s", engine->GetAPIName(), class_name);
    00290
    00291     sq_pushstring(vm, OTTD2SQ(class_name2), -1);
    00292   } else {
    00293     sq_pushstring(vm, OTTD2SQ(class_name), -1);
    00294   }
    00295
    00296   if (SQ_FAILED(sq_get(vm, -2))) {
    00297     DEBUG(misc, 0, "[squirrel] Failed to find class by the name '%s%s'", prepend_API_name ? engine->GetAPIName() : "", class_name);
    00298     sq_settop(vm, oldtop);
    00299     return false;
    00300   }
    00301
    00302   /* Create the instance */
    00303   if (SQ_FAILED(sq_createinstance(vm, -1))) {
    00304     DEBUG(misc, 0, "[squirrel] Failed to create instance for class '%s%s'", prepend_API_name ? engine->GetAPIName() : "", class_name);
    00305     sq_settop(vm, oldtop);
    00306     return false;
    00307   }
    00308
    00309   if (instance != NULL) {
    00310     /* Find our instance */
    00311     sq_getstackobj(vm, -1, instance);
    00312     /* Add a reference to it, so it survives for ever */
    00313     sq_addref(vm, instance);
    00314   }
    00315   sq_remove(vm, -2); // Class-name
    00316   sq_remove(vm, -2); // Root-table
    00317
    00318   /* Store it in the class */
    00319   sq_setinstanceup(vm, -1, real_instance);
    00320   if (release_hook != NULL) sq_setreleasehook(vm, -1, release_hook);
    00321
    00322   if (instance != NULL) sq_settop(vm, oldtop);
    00323
    00324   return true;
    00325 }
    00326
    00327 bool Squirrel::CreateClassInstance(const char *class_name, void *real_instance, HSQOBJECT *instance)
    00328 {
    00329   return Squirrel::CreateClassInstanceVM(this->vm, class_name, real_instance, instance, NULL);
    00330 }
    00331
    00332 Squirrel::Squirrel(const char *APIName) :
    00333   global_pointer(NULL),
    00334   print_func(NULL),
    00335   crashed(false),
    00336   overdrawn_ops(0),
    00337   APIName(APIName)
    00338 {
    00339   this->vm = sq_open(1024);
    00340
    00341   /* Handle compile-errors ourself, so we can display it nicely */
    00342   sq_setcompilererrorhandler(this->vm, &Squirrel::CompileError);
    00343   sq_notifyallexceptions(this->vm, SQTrue);
    00344   /* Set a good print-function */
    00345   sq_setprintfunc(this->vm, &Squirrel::PrintFunc);
    00346   /* Handle runtime-errors ourself, so we can display it nicely */
    00347   sq_newclosure(this->vm, &Squirrel::_RunError, 0);
    00348   sq_seterrorhandler(this->vm);
    00349
    00350   /* Set the foreign pointer, so we can always find this instance from within the VM */
    00351   sq_setforeignptr(this->vm, this);
    00352
    00353   sq_pushroottable(this->vm);
    00354   squirrel_register_global_std(this);
    00355 }
    00356
    00357 class SQFile {
    00358 private:
    00359   FILE *file;
    00360   size_t size;
    00361   size_t pos;
    00362
    00363 public:
    00364   SQFile(FILE *file, size_t size) : file(file), size(size), pos(0) {}
    00365
    00366   size_t Read(void *buf, size_t elemsize, size_t count)
    00367   {
    00368     assert(elemsize != 0);
    00369     if (this->pos + (elemsize * count) > this->size) {
    00370       count = (this->size - this->pos) / elemsize;
    00371     }
    00372     if (count == 0) return 0;
    00373     size_t ret = fread(buf, elemsize, count, this->file);
    00374     this->pos += ret * elemsize;
    00375     return ret;
    00376   }
    00377 };
    00378
    00379 static SQInteger _io_file_lexfeed_ASCII(SQUserPointer file)
    00380 {
    00381   char c;
    00382   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) return c;
    00383   return 0;
    00384 }
    00385
    00386 static SQInteger _io_file_lexfeed_UTF8(SQUserPointer file)
    00387 {
    00388   static const SQInteger utf8_lengths[16] =
    00389   {
    00390     1, 1, 1, 1, 1, 1, 1, 1, /* 0000 to 0111 : 1 byte (plain ASCII) */
    00391     0, 0, 0, 0,             /* 1000 to 1011 : not valid */
    00392     2, 2,                   /* 1100, 1101 : 2 bytes */
    00393     3,                      /* 1110 : 3 bytes */
    00394     4                       /* 1111 : 4 bytes */
    00395   };
    00396   static unsigned char byte_masks[5] = {0, 0, 0x1F, 0x0F, 0x07};
    00397   unsigned char inchar;
    00398   SQInteger c = 0;
    00399   if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
    00400   c = inchar;
    00401
    00402   if (c >= 0x80) {
    00403     SQInteger tmp;
    00404     SQInteger codelen = utf8_lengths[c >> 4];
    00405     if (codelen == 0) return 0;
    00406
    00407     tmp = c & byte_masks[codelen];
    00408     for (SQInteger n = 0; n < codelen - 1; n++) {
    00409       tmp <<= 6;
    00410       if (((SQFile *)file)->Read(&inchar, sizeof(inchar), 1) != 1) return 0;
    00411       tmp |= inchar & 0x3F;
    00412     }
    00413     c = tmp;
    00414   }
    00415   return c;
    00416 }
    00417
    00418 static SQInteger _io_file_lexfeed_UCS2_no_swap(SQUserPointer file)
    00419 {
    00420   wchar_t c;
    00421   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) return (SQChar)c;
    00422   return 0;
    00423 }
    00424
    00425 static SQInteger _io_file_lexfeed_UCS2_swap(SQUserPointer file)
    00426 {
    00427   unsigned short c;
    00428   if (((SQFile *)file)->Read(&c, sizeof(c), 1) > 0) {
    00429     c = ((c >> 8) & 0x00FF)| ((c << 8) & 0xFF00);
    00430     return (SQChar)c;
    00431   }
    00432   return 0;
    00433 }
    00434
    00435 static SQInteger _io_file_read(SQUserPointer file, SQUserPointer buf, SQInteger size)
    00436 {
    00437   SQInteger ret = ((SQFile *)file)->Read(buf, 1, size);
    00438   if (ret == 0) return -1;
    00439   return ret;
    00440 }
    00441
    00442 SQRESULT Squirrel::LoadFile(HSQUIRRELVM vm, const char *filename, SQBool printerror)
    00443 {
    00444   size_t size;
    00445   FILE *file;
    00446   SQInteger ret;
    00447   unsigned short us;
    00448   unsigned char uc;
    00449   SQLEXREADFUNC func;
    00450
    00451   if (strncmp(this->GetAPIName(), "AI", 2) == 0) {
    00452     file = FioFOpenFile(filename, "rb", AI_DIR, &size);
    00453     if (file == NULL) file = FioFOpenFile(filename, "rb", AI_LIBRARY_DIR, &size);
    00454   } else if (strncmp(this->GetAPIName(), "GS", 2) == 0) {
    00455     file = FioFOpenFile(filename, "rb", GAME_DIR, &size);
    00456     if (file == NULL) file = FioFOpenFile(filename, "rb", GAME_LIBRARY_DIR, &size);
    00457   } else {
    00458     NOT_REACHED();
    00459   }
    00460
    00461   if (file != NULL) {
    00462     SQFile f(file, size);
    00463     ret = fread(&us, 1, sizeof(us), file);
    00464     /* Most likely an empty file */
    00465     if (ret != 2) us = 0;
    00466
    00467     switch (us) {
    00468       case SQ_BYTECODE_STREAM_TAG: { // BYTECODE
    00469         if (fseek(file, -2, SEEK_CUR) < 0) {
    00470           FioFCloseFile(file);
    00471           return sq_throwerror(vm, _SC("cannot seek the file"));
    00472         }
    00473         if (SQ_SUCCEEDED(sq_readclosure(vm, _io_file_read, &f))) {
    00474           FioFCloseFile(file);
    00475           return SQ_OK;
    00476         }
    00477         FioFCloseFile(file);
    00478         return sq_throwerror(vm, _SC("Couldn't read bytecode"));
    00479       }
    00480       case 0xFFFE:
    00481         /* Either this file is encoded as big-endian and we're on a little-endian
    00482          * machine, or this file is encoded as little-endian and we're on a big-endian
    00483          * machine. Either way, swap the bytes of every word we read. */
    00484         func = _io_file_lexfeed_UCS2_swap;
    00485         break;
    00486       case 0xFEFF: func = _io_file_lexfeed_UCS2_no_swap; break;
    00487       case 0xBBEF: // UTF-8
    00488       case 0xEFBB: // UTF-8 on big-endian machine
    00489         if (fread(&uc, 1, sizeof(uc), file) == 0) {
    00490           FioFCloseFile(file);
    00491           return sq_throwerror(vm, _SC("I/O error"));
    00492         }
    00493         if (uc != 0xBF) {
    00494           FioFCloseFile(file);
    00495           return sq_throwerror(vm, _SC("Unrecognized encoding"));
    00496         }
    00497         func = _io_file_lexfeed_UTF8;
    00498         break;
    00499       default: // ASCII
    00500         func = _io_file_lexfeed_ASCII;
    00501         if (fseek(file, -2, SEEK_CUR) < 0) {
    00502           FioFCloseFile(file);
    00503           return sq_throwerror(vm, _SC("cannot seek the file"));
    00504         }
    00505         break;
    00506     }
    00507
    00508     if (SQ_SUCCEEDED(sq_compile(vm, func, &f, OTTD2SQ(filename), printerror))) {
    00509       FioFCloseFile(file);
    00510       return SQ_OK;
    00511     }
    00512     FioFCloseFile(file);
    00513     return SQ_ERROR;
    00514   }
    00515   return sq_throwerror(vm, _SC("cannot open the file"));
    00516 }
    00517
    00518 bool Squirrel::LoadScript(HSQUIRRELVM vm, const char *script, bool in_root)
    00519 {
    00520   /* Make sure we are always in the root-table */
    00521   if (in_root) sq_pushroottable(vm);
    00522
    00523   SQInteger ops_left = vm->_ops_till_suspend;
    00524   /* Load and run the script */
    00525   if (SQ_SUCCEEDED(LoadFile(vm, script, SQTrue))) {
    00526     sq_push(vm, -2);
    00527     if (SQ_SUCCEEDED(sq_call(vm, 1, SQFalse, SQTrue, 100000))) {
    00528       sq_pop(vm, 1);
    00529       /* After compiling the file we want to reset the amount of opcodes. */
    00530       vm->_ops_till_suspend = ops_left;
    00531       return true;
    00532     }
    00533   }
    00534
    00535   vm->_ops_till_suspend = ops_left;
    00536   DEBUG(misc, 0, "[squirrel] Failed to compile '%s'", script);
    00537   return false;
    00538 }
    00539
    00540 bool Squirrel::LoadScript(const char *script)
    00541 {
    00542   return LoadScript(this->vm, script);
    00543 }
    00544
    00545 Squirrel::~Squirrel()
    00546 {
    00547   /* Clean up the stuff */
    00548   sq_pop(this->vm, 1);
    00549   sq_close(this->vm);
    00550 }
    00551
    00552 void Squirrel::InsertResult(bool result)
    00553 {
    00554   sq_pushbool(this->vm, result);
    00555   if (this->IsSuspended()) { // Called before resuming a suspended script?
    00556     vm->GetAt(vm->_stackbase + vm->_suspended_target) = vm->GetUp(-1);
    00557     vm->Pop();
    00558   }
    00559 }
    00560
    00561 void Squirrel::InsertResult(int result)
    00562 {
    00563   sq_pushinteger(this->vm, result);
    00564   if (this->IsSuspended()) { // Called before resuming a suspended script?
    00565     vm->GetAt(vm->_stackbase + vm->_suspended_target) = vm->GetUp(-1);
    00566     vm->Pop();
    00567   }
    00568 }
    00569
    00570 /* static */ void Squirrel::DecreaseOps(HSQUIRRELVM vm, int ops)
    00571 {
    00572   vm->DecreaseOps(ops);
    00573 }
    00574
    00575 bool Squirrel::IsSuspended()
    00576 {
    00577   return this->vm->_suspended != 0;
    00578 }
    00579
    00580 bool Squirrel::HasScriptCrashed()
    00581 {
    00582   return this->crashed;
    00583 }
    00584
    00585 void Squirrel::ResetCrashed()
    00586 {
    00587   this->crashed = false;
    00588 }
    00589
    00590 void Squirrel::CrashOccurred()
    00591 {
    00592   this->crashed = true;
    00593 }
    00594
    00595 bool Squirrel::CanSuspend()
    00596 {
    00597   return sq_can_suspend(this->vm);
    00598 }
    00599
    00600 SQInteger Squirrel::GetOpsTillSuspend()
    00601 {
    00602   return this->vm->_ops_till_suspend;
    00603 }