src/squirrel/squirrel/sqvm.cpp

   1 /*
   2         see copyright notice in squirrel.h
   3 */
   4 #include "sqpcheader.h"
   5 #include <math.h>
   6 #include <stdlib.h>
   7 #include "sqopcodes.h"
   8 #include "sqfuncproto.h"
   9 #include "sqvm.h"
  10 #include "sqclosure.h"
  11 #include "sqstring.h"
  12 #include "sqtable.h"
  13 #include "squserdata.h"
  14 #include "sqarray.h"
  15 #include "sqclass.h"
  16
  17 #define TOP() (_stack._vals[_top-1])
  18
  19 bool SQVM::BW_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
  20 {
  21         SQInteger res;
  22         SQInteger i1 = _integer(o1), i2 = _integer(o2);
  23         if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER))
  24         {
  25                 switch(op) {
  26                         case BW_AND:    res = i1 & i2; break;
  27                         case BW_OR:             res = i1 | i2; break;
  28                         case BW_XOR:    res = i1 ^ i2; break;
  29                         case BW_SHIFTL: res = i1 << i2; break;
  30                         case BW_SHIFTR: res = i1 >> i2; break;
  31                         case BW_USHIFTR:res = (SQInteger)(*((SQUnsignedInteger*)&i1) >> i2); break;
  32                         default: { Raise_Error(_SC("internal vm error bitwise op failed")); return false; }
  33                 }
  34         }
  35         else { Raise_Error(_SC("bitwise op between '%s' and '%s'"),GetTypeName(o1),GetTypeName(o2)); return false;}
  36         trg = res;
  37         return true;
  38 }
  39
  40 bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
  41 {
  42         if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
  43                         if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER)) {
  44                                 SQInteger res, i1 = _integer(o1), i2 = _integer(o2);
  45                                 switch(op) {
  46                                 case '+': res = i1 + i2; break;
  47                                 case '-': res = i1 - i2; break;
  48                                 case '/': if(i2 == 0) { Raise_Error(_SC("division by zero")); return false; }
  49                                         res = i1 / i2;
  50                                         break;
  51                                 case '*': res = i1 * i2; break;
  52                                 case '%': res = i1 % i2; break;
  53                                 default: res = 0xDEADBEEF;
  54                                 }
  55                                 trg = res;
  56                         }else{
  57                                 SQFloat res, f1 = tofloat(o1), f2 = tofloat(o2);
  58                                 switch(op) {
  59                                 case '+': res = f1 + f2; break;
  60                                 case '-': res = f1 - f2; break;
  61                                 case '/': res = f1 / f2; break;
  62                                 case '*': res = f1 * f2; break;
  63                                 case '%': res = SQFloat(fmod((double)f1,(double)f2)); break;
  64                                 default: res = 0x0f;
  65                                 }
  66                                 trg = res;
  67                         }
  68                 } else {
  69                         if(op == '+' && (type(o1) == OT_STRING || type(o2) == OT_STRING)){
  70                                         if(!StringCat(o1, o2, trg)) return false;
  71                         }
  72                         else if(!ArithMetaMethod(op,o1,o2,trg)) {
  73                                 Raise_Error(_SC("arith op %c on between '%s' and '%s'"),op,GetTypeName(o1),GetTypeName(o2)); return false;
  74                         }
  75                 }
  76                 return true;
  77 }
  78
  79 SQVM::SQVM(SQSharedState *ss)
  80 {
  81         _sharedstate=ss;
  82         _suspended = SQFalse;
  83         _suspended_target=-1;
  84         _suspended_root = SQFalse;
  85         _suspended_traps=-1;
  86         _foreignptr=NULL;
  87         _nnativecalls=0;
  88         _lasterror = _null_;
  89         _errorhandler = _null_;
  90         _debughook = _null_;
  91         ci = NULL;
  92         INIT_CHAIN();ADD_TO_CHAIN(&_ss(this)->_gc_chain,this);
  93 }
  94
  95 void SQVM::Finalize()
  96 {
  97         _roottable = _null_;
  98         _lasterror = _null_;
  99         _errorhandler = _null_;
 100         _debughook = _null_;
 101         temp_reg = _null_;
 102         _callstackdata.resize(0);
 103         SQInteger size=_stack.size();
 104         for(SQInteger i=0;i<size;i++)
 105                 _stack[i]=_null_;
 106 }
 107
 108 SQVM::~SQVM()
 109 {
 110         Finalize();
 111         //sq_free(_callsstack,_alloccallsstacksize*sizeof(CallInfo));
 112         REMOVE_FROM_CHAIN(&_ss(this)->_gc_chain,this);
 113 }
 114
 115 bool SQVM::ArithMetaMethod(SQInteger op,const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &dest)
 116 {
 117         SQMetaMethod mm;
 118         switch(op){
 119                 case _SC('+'): mm=MT_ADD; break;
 120                 case _SC('-'): mm=MT_SUB; break;
 121                 case _SC('/'): mm=MT_DIV; break;
 122                 case _SC('*'): mm=MT_MUL; break;
 123                 case _SC('%'): mm=MT_MODULO; break;
 124                 default: mm = MT_ADD; assert(0); break; //shutup compiler
 125         }
 126         if(is_delegable(o1) && _delegable(o1)->_delegate) {
 127                 Push(o1);Push(o2);
 128                 return CallMetaMethod(_delegable(o1),mm,2,dest);
 129         }
 130         return false;
 131 }
 132
 133 bool SQVM::NEG_OP(SQObjectPtr &trg,const SQObjectPtr &o)
 134 {
 135
 136         switch(type(o)) {
 137         case OT_INTEGER:
 138                 trg = -_integer(o);
 139                 return true;
 140         case OT_FLOAT:
 141                 trg = -_float(o);
 142                 return true;
 143         case OT_TABLE:
 144         case OT_USERDATA:
 145         case OT_INSTANCE:
 146                 if(_delegable(o)->_delegate) {
 147                         Push(o);
 148                         if(CallMetaMethod(_delegable(o), MT_UNM, 1, temp_reg)) {
 149                                 trg = temp_reg;
 150                                 return true;
 151                         }
 152                 }
 153         default:break; //shutup compiler
 154         }
 155         Raise_Error(_SC("attempt to negate a %s"), GetTypeName(o));
 156         return false;
 157 }
 158
 159 #define _RET_SUCCEED(exp) { result = (exp); return true; }
 160 bool SQVM::ObjCmp(const SQObjectPtr &o1,const SQObjectPtr &o2,SQInteger &result)
 161 {
 162         if(type(o1)==type(o2)){
 163                 if(_userpointer(o1)==_userpointer(o2))_RET_SUCCEED(0);
 164                 SQObjectPtr res;
 165                 switch(type(o1)){
 166                 case OT_STRING:
 167                         _RET_SUCCEED(scstrcmp(_stringval(o1),_stringval(o2)));
 168                 case OT_INTEGER:
 169                         _RET_SUCCEED(_integer(o1)-_integer(o2));
 170                 case OT_FLOAT:
 171                         _RET_SUCCEED((_float(o1)<_float(o2))?-1:1);
 172                 case OT_TABLE:
 173                 case OT_USERDATA:
 174                 case OT_INSTANCE:
 175                         if(_delegable(o1)->_delegate) {
 176                                 Push(o1);Push(o2);
 177                                 if(CallMetaMethod(_delegable(o1),MT_CMP,2,res)) break;
 178                         }
 179                         //continues through (no break needed)
 180                 default:
 181                         _RET_SUCCEED( _userpointer(o1) < _userpointer(o2)?-1:1 );
 182                 }
 183                 if(type(res)!=OT_INTEGER) { Raise_CompareError(o1,o2); return false; }
 184                         _RET_SUCCEED(_integer(res));
 185
 186         }
 187         else{
 188                 if(sq_isnumeric(o1) && sq_isnumeric(o2)){
 189                         if((type(o1)==OT_INTEGER) && (type(o2)==OT_FLOAT)) {
 190                                 if( _integer(o1)==_float(o2) ) { _RET_SUCCEED(0); }
 191                                 else if( _integer(o1)<_float(o2) ) { _RET_SUCCEED(-1); }
 192                                 _RET_SUCCEED(1);
 193                         }
 194                         else{
 195                                 if( _float(o1)==_integer(o2) ) { _RET_SUCCEED(0); }
 196                                 else if( _float(o1)<_integer(o2) ) { _RET_SUCCEED(-1); }
 197                                 _RET_SUCCEED(1);
 198                         }
 199                 }
 200                 else if(type(o1)==OT_NULL) {_RET_SUCCEED(-1);}
 201                 else if(type(o2)==OT_NULL) {_RET_SUCCEED(1);}
 202                 else { Raise_CompareError(o1,o2); return false; }
 203
 204         }
 205         assert(0);
 206         _RET_SUCCEED(0); //cannot happen
 207 }
 208
 209 bool SQVM::CMP_OP(CmpOP op, const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &res)
 210 {
 211         SQInteger r;
 212         if(ObjCmp(o1,o2,r)) {
 213                 switch(op) {
 214                         case CMP_G: res = (r > 0)?_true_:_false_; return true;
 215                         case CMP_GE: res = (r >= 0)?_true_:_false_; return true;
 216                         case CMP_L: res = (r < 0)?_true_:_false_; return true;
 217                         case CMP_LE: res = (r <= 0)?_true_:_false_; return true;
 218
 219                 }
 220                 assert(0);
 221         }
 222         return false;
 223 }
 224
 225 void SQVM::ToString(const SQObjectPtr &o,SQObjectPtr &res)
 226 {
 227         switch(type(o)) {
 228         case OT_STRING:
 229                 res = o;
 230                 return;
 231         case OT_FLOAT:
 232                 scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%g"),_float(o));
 233                 break;
 234         case OT_INTEGER:
 235                 scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%d"),_integer(o));
 236                 break;
 237         case OT_BOOL:
 238                 scsprintf(_sp(rsl(6)),_integer(o)?_SC("true"):_SC("false"));
 239                 break;
 240         case OT_TABLE:
 241         case OT_USERDATA:
 242         case OT_INSTANCE:
 243                 if(_delegable(o)->_delegate) {
 244                         Push(o);
 245                         if(CallMetaMethod(_delegable(o),MT_TOSTRING,1,res)) {
 246                                 if(type(res) == OT_STRING)
 247                                         return;
 248                                 //else keeps going to the default
 249                         }
 250                 }
 251         default:
 252                 scsprintf(_sp(rsl(sizeof(void*)+20)),_SC("(%s : 0x%p)"),GetTypeName(o),(void*)_rawval(o));
 253         }
 254         res = SQString::Create(_ss(this),_spval);
 255 }
 256
 257
 258 bool SQVM::StringCat(const SQObjectPtr &str,const SQObjectPtr &obj,SQObjectPtr &dest)
 259 {
 260         SQObjectPtr a, b;
 261         ToString(str, a);
 262         ToString(obj, b);
 263         SQInteger l = _string(a)->_len , ol = _string(b)->_len;
 264         SQChar *s = _sp(rsl(l + ol + 1));
 265         memcpy(s, _stringval(a), rsl(l));
 266         memcpy(s + l, _stringval(b), rsl(ol));
 267         dest = SQString::Create(_ss(this), _spval, l + ol);
 268         return true;
 269 }
 270
 271 void SQVM::TypeOf(const SQObjectPtr &obj1,SQObjectPtr &dest)
 272 {
 273         if(is_delegable(obj1) && _delegable(obj1)->_delegate) {
 274                 Push(obj1);
 275                 if(CallMetaMethod(_delegable(obj1),MT_TYPEOF,1,dest))
 276                         return;
 277         }
 278         dest = SQString::Create(_ss(this),GetTypeName(obj1));
 279 }
 280
 281 bool SQVM::Init(SQVM *friendvm, SQInteger stacksize)
 282 {
 283         _stack.resize(stacksize);
 284         //_callsstack.reserve(4);
 285         _alloccallsstacksize = 4;
 286         _callstackdata.resize(_alloccallsstacksize);
 287         _callsstacksize = 0;
 288         _callsstack = &_callstackdata[0];
 289         //_callsstack = (CallInfo*)sq_malloc(_alloccallsstacksize*sizeof(CallInfo));
 290         _stackbase = 0;
 291         _top = 0;
 292         if(!friendvm)
 293                 _roottable = SQTable::Create(_ss(this), 0);
 294         else {
 295                 _roottable = friendvm->_roottable;
 296                 _errorhandler = friendvm->_errorhandler;
 297                 _debughook = friendvm->_debughook;
 298         }
 299
 300         sq_base_register(this);
 301         return true;
 302 }
 303
 304 extern SQInstructionDesc g_InstrDesc[];
 305
 306 bool SQVM::StartCall(SQClosure *closure,SQInteger target,SQInteger args,SQInteger stackbase,bool tailcall)
 307 {
 308         SQFunctionProto *func = _funcproto(closure->_function);
 309
 310         const SQInteger paramssize = func->_nparameters;
 311         const SQInteger newtop = stackbase + func->_stacksize;
 312         SQInteger nargs = args;
 313         if (paramssize != nargs) {
 314                 SQInteger ndef = func->_ndefaultparams;
 315                 if(ndef && nargs < paramssize) {
 316                         SQInteger diff = paramssize - nargs;
 317                         for(SQInteger n = ndef - diff; n < ndef; n++) {
 318                                 _stack._vals[stackbase + (nargs++)] = closure->_defaultparams[n];
 319                         }
 320                 }
 321                 else if(func->_varparams)
 322                 {
 323                         if (nargs < paramssize) {
 324                                 Raise_Error(_SC("wrong number of parameters"));
 325                                 return false;
 326                         }
 327                         for(SQInteger n = 0; n < nargs - paramssize; n++) {
 328                                 _vargsstack.push_back(_stack._vals[stackbase+paramssize+n]);
 329                                 _stack._vals[stackbase+paramssize+n] = _null_;
 330                         }
 331                 }
 332                 else {
 333                         Raise_Error(_SC("wrong number of parameters"));
 334                         return false;
 335                 }
 336         }
 337
 338         if(type(closure->_env) == OT_WEAKREF) {
 339                 _stack._vals[stackbase] = _weakref(closure->_env)->_obj;
 340         }
 341
 342         if (!tailcall) {
 343                 CallInfo lc;
 344                 lc._generator = NULL;
 345                 lc._etraps = 0;
 346                 lc._prevstkbase = (SQInt32) ( stackbase - _stackbase );
 347                 lc._target = (SQInt32) target;
 348                 lc._prevtop = (SQInt32) (_top - _stackbase);
 349                 lc._ncalls = 1;
 350                 lc._root = SQFalse;
 351                 PUSH_CALLINFO(this, lc);
 352         }
 353         else {
 354                 ci->_ncalls++;
 355         }
 356         ci->_vargs.size = (SQInt32)(nargs - paramssize);
 357         ci->_vargs.base = (SQInt32)(_vargsstack.size()-(ci->_vargs.size));
 358         ci->_closure = closure;
 359         ci->_literals = func->_literals;
 360         ci->_ip = func->_instructions;
 361         //grows the stack if needed
 362         if (((SQUnsignedInteger)newtop + (func->_stacksize<<1)) > _stack.size()) {
 363                 _stack.resize(_stack.size() + (func->_stacksize<<1));
 364         }
 365
 366         _top = newtop;
 367         _stackbase = stackbase;
 368         if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
 369                 CallDebugHook(_SC('c'));
 370         return true;
 371 }
 372
 373 bool SQVM::Return(SQInteger _arg0, SQInteger _arg1, SQObjectPtr &retval)
 374 {
 375         if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
 376                 for(SQInteger i=0;i<ci->_ncalls;i++)
 377                         CallDebugHook(_SC('r'));
 378
 379         SQBool broot = ci->_root;
 380         SQInteger last_top = _top;
 381         SQInteger target = ci->_target;
 382         SQInteger oldstackbase = _stackbase;
 383         _stackbase -= ci->_prevstkbase;
 384         _top = _stackbase + ci->_prevtop;
 385         if(ci->_vargs.size) PopVarArgs(ci->_vargs);
 386         POP_CALLINFO(this);
 387         if (broot) {
 388                 if (_arg0 != MAX_FUNC_STACKSIZE) retval = _stack._vals[oldstackbase+_arg1];
 389                 else retval = _null_;
 390         }
 391         else {
 392                 if(target != -1) { //-1 is when a class contructor ret value has to be ignored
 393                         if (_arg0 != MAX_FUNC_STACKSIZE)
 394                                 STK(target) = _stack._vals[oldstackbase+_arg1];
 395                         else
 396                                 STK(target) = _null_;
 397                 }
 398         }
 399
 400         while (last_top >= _top) _stack._vals[last_top--].Null();
 401         assert(oldstackbase >= _stackbase);
 402         return broot?true:false;
 403 }
 404
 405 #define _RET_ON_FAIL(exp) { if(!exp) return false; }
 406
 407 bool SQVM::LOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
 408 {
 409         _RET_ON_FAIL(ARITH_OP( op , target, a, incr));
 410         a = target;
 411         return true;
 412 }
 413
 414 bool SQVM::PLOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
 415 {
 416         SQObjectPtr trg;
 417         _RET_ON_FAIL(ARITH_OP( op , trg, a, incr));
 418         target = a;
 419         a = trg;
 420         return true;
 421 }
 422
 423 bool SQVM::DerefInc(SQInteger op,SQObjectPtr &target, SQObjectPtr &self, SQObjectPtr &key, SQObjectPtr &incr, bool postfix)
 424 {
 425         SQObjectPtr tmp, tself = self, tkey = key;
 426         if (!Get(tself, tkey, tmp, false, true)) { Raise_IdxError(tkey); return false; }
 427         _RET_ON_FAIL(ARITH_OP( op , target, tmp, incr))
 428         Set(tself, tkey, target,true);
 429         if (postfix) target = tmp;
 430         return true;
 431 }
 432
 433 #define arg0 (_i_._arg0)
 434 #define arg1 (_i_._arg1)
 435 #define sarg1 (*((SQInt32 *)&_i_._arg1))
 436 #define arg2 (_i_._arg2)
 437 #define arg3 (_i_._arg3)
 438 #define sarg3 ((SQInteger)*((signed char *)&_i_._arg3))
 439
 440 SQRESULT SQVM::Suspend()
 441 {
 442         if (_suspended)
 443                 return sq_throwerror(this, _SC("cannot suspend an already suspended vm"));
 444         if (_nnativecalls!=2)
 445                 return sq_throwerror(this, _SC("cannot suspend through native calls/metamethods"));
 446         return SQ_SUSPEND_FLAG;
 447 }
 448
 449 void SQVM::PopVarArgs(VarArgs &vargs)
 450 {
 451         for(SQInteger n = 0; n< vargs.size; n++)
 452                 _vargsstack.pop_back();
 453 }
 454
 455 #define _FINISH(howmuchtojump) {jump = howmuchtojump; return true; }
 456 bool SQVM::FOREACH_OP(SQObjectPtr &o1,SQObjectPtr &o2,SQObjectPtr
 457 &o3,SQObjectPtr &o4,SQInteger arg_2,int exitpos,int &jump)
 458 {
 459         SQInteger nrefidx;
 460         switch(type(o1)) {
 461         case OT_TABLE:
 462                 if((nrefidx = _table(o1)->Next(false,o4, o2, o3)) == -1) _FINISH(exitpos);
 463                 o4 = (SQInteger)nrefidx; _FINISH(1);
 464         case OT_ARRAY:
 465                 if((nrefidx = _array(o1)->Next(o4, o2, o3)) == -1) _FINISH(exitpos);
 466                 o4 = (SQInteger) nrefidx; _FINISH(1);
 467         case OT_STRING:
 468                 if((nrefidx = _string(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
 469                 o4 = (SQInteger)nrefidx; _FINISH(1);
 470         case OT_CLASS:
 471                 if((nrefidx = _class(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
 472                 o4 = (SQInteger)nrefidx; _FINISH(1);
 473         case OT_USERDATA:
 474         case OT_INSTANCE:
 475                 if(_delegable(o1)->_delegate) {
 476                         SQObjectPtr itr;
 477                         Push(o1);
 478                         Push(o4);
 479                         if(CallMetaMethod(_delegable(o1), MT_NEXTI, 2, itr)){
 480                                 o4 = o2 = itr;
 481                                 if(type(itr) == OT_NULL) _FINISH(exitpos);
 482                                 if(!Get(o1, itr, o3, false,false)) {
 483                                         Raise_Error(_SC("_nexti returned an invalid idx"));
 484                                         return false;
 485                                 }
 486                                 _FINISH(1);
 487                         }
 488                         Raise_Error(_SC("_nexti failed"));
 489                         return false;
 490                 }
 491                 break;
 492         case OT_GENERATOR:
 493                 if(_generator(o1)->_state == SQGenerator::eDead) _FINISH(exitpos);
 494                 if(_generator(o1)->_state == SQGenerator::eSuspended) {
 495                         SQInteger idx = 0;
 496                         if(type(o4) == OT_INTEGER) {
 497                                 idx = _integer(o4) + 1;
 498                         }
 499                         o2 = idx;
 500                         o4 = idx;
 501                         _generator(o1)->Resume(this, arg_2+1);
 502                         _FINISH(0);
 503                 }
 504         default:
 505                 Raise_Error(_SC("cannot iterate %s"), GetTypeName(o1));
 506         }
 507         return false; //cannot be hit(just to avoid warnings)
 508 }
 509
 510 bool SQVM::DELEGATE_OP(SQObjectPtr &trg,SQObjectPtr &o1,SQObjectPtr &o2)
 511 {
 512         if(type(o1) != OT_TABLE) { Raise_Error(_SC("delegating a '%s'"), GetTypeName(o1)); return false; }
 513         switch(type(o2)) {
 514         case OT_TABLE:
 515                 if(!_table(o1)->SetDelegate(_table(o2))){
 516                         Raise_Error(_SC("delegate cycle detected"));
 517                         return false;
 518                 }
 519                 break;
 520         case OT_NULL:
 521                 _table(o1)->SetDelegate(NULL);
 522                 break;
 523         default:
 524                 Raise_Error(_SC("using '%s' as delegate"), GetTypeName(o2));
 525                 return false;
 526                 break;
 527         }
 528         trg = o1;
 529         return true;
 530 }
 531 #define COND_LITERAL (arg3!=0?ci->_literals[arg1]:STK(arg1))
 532
 533 #define _GUARD(exp) { if(!exp) { Raise_Error(_lasterror); SQ_THROW();} }
 534
 535 #define SQ_THROW() { goto exception_trap; }
 536
 537 bool SQVM::CLOSURE_OP(SQObjectPtr &target, SQFunctionProto *func)
 538 {
 539         SQInteger nouters;
 540         SQClosure *closure = SQClosure::Create(_ss(this), func);
 541         if((nouters = func->_noutervalues)) {
 542                 closure->_outervalues.reserve(nouters);
 543                 for(SQInteger i = 0; i<nouters; i++) {
 544                         SQOuterVar &v = func->_outervalues[i];
 545                         switch(v._type){
 546                         case otSYMBOL:
 547                                 closure->_outervalues.push_back(_null_);
 548                                 if(!Get(_stack._vals[_stackbase]/*STK(0)*/, v._src, closure->_outervalues.top(), false,true))
 549                                 {Raise_IdxError(v._src); return false; }
 550                                 break;
 551                         case otLOCAL:
 552                                 closure->_outervalues.push_back(_stack._vals[_stackbase+_integer(v._src)]);
 553                                 break;
 554                         case otOUTER:
 555                                 closure->_outervalues.push_back(_closure(ci->_closure)->_outervalues[_integer(v._src)]);
 556                                 break;
 557                         }
 558                 }
 559         }
 560         SQInteger ndefparams;
 561         if((ndefparams = func->_ndefaultparams)) {
 562                 closure->_defaultparams.reserve(ndefparams);
 563                 for(SQInteger i = 0; i < ndefparams; i++) {
 564                         SQInteger spos = func->_defaultparams[i];
 565                         closure->_defaultparams.push_back(_stack._vals[_stackbase + spos]);
 566                 }
 567         }
 568         target = closure;
 569         return true;
 570
 571 }
 572
 573 bool SQVM::GETVARGV_OP(SQObjectPtr &target,SQObjectPtr &index,CallInfo *ci)
 574 {
 575         if(ci->_vargs.size == 0) {
 576                 Raise_Error(_SC("the function doesn't have var args"));
 577                 return false;
 578         }
 579         if(!sq_isnumeric(index)){
 580                 Raise_Error(_SC("indexing 'vargv' with %s"),GetTypeName(index));
 581                 return false;
 582         }
 583         SQInteger idx = tointeger(index);
 584         if(idx < 0 || idx >= ci->_vargs.size){ Raise_Error(_SC("vargv index out of range")); return false; }
 585         target = _vargsstack[ci->_vargs.base+idx];
 586         return true;
 587 }
 588
 589 bool SQVM::CLASS_OP(SQObjectPtr &target,SQInteger baseclass,SQInteger attributes)
 590 {
 591         SQClass *base = NULL;
 592         SQObjectPtr attrs;
 593         if(baseclass != -1) {
 594                 if(type(_stack._vals[_stackbase+baseclass]) != OT_CLASS) { Raise_Error(_SC("trying to inherit from a %s"),GetTypeName(_stack._vals[_stackbase+baseclass])); return false; }
 595                 base = _class(_stack._vals[_stackbase + baseclass]);
 596         }
 597         if(attributes != MAX_FUNC_STACKSIZE) {
 598                 attrs = _stack._vals[_stackbase+attributes];
 599         }
 600         target = SQClass::Create(_ss(this),base);
 601         if(type(_class(target)->_metamethods[MT_INHERITED]) != OT_NULL) {
 602                 int nparams = 2;
 603                 SQObjectPtr ret;
 604                 Push(target); Push(attrs);
 605                 Call(_class(target)->_metamethods[MT_INHERITED],nparams,_top - nparams, ret, false);
 606                 Pop(nparams);
 607         }
 608         _class(target)->_attributes = attrs;
 609         return true;
 610 }
 611
 612
 613
 614 bool SQVM::IsEqual(SQObjectPtr &o1,SQObjectPtr &o2,bool &res)
 615 {
 616         if(type(o1) == type(o2)) {
 617                 res = ((_userpointer(o1) == _userpointer(o2)?true:false));
 618         }
 619         else {
 620                 if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
 621                         SQInteger cmpres;
 622                         if(!ObjCmp(o1, o2,cmpres)) return false;
 623                         res = (cmpres == 0);
 624                 }
 625                 else {
 626                         res = false;
 627                 }
 628         }
 629         return true;
 630 }
 631
 632 bool SQVM::IsFalse(SQObjectPtr &o)
 633 {
 634         if((type(o) & SQOBJECT_CANBEFALSE) && ( (type(o) == OT_FLOAT) && (_float(o) == SQFloat(0.0)) )
 635                 || (_integer(o) == 0) ) { //OT_NULL|OT_INTEGER|OT_BOOL
 636                 return true;
 637         }
 638         return false;
 639 }
 640
 641 bool SQVM::GETPARENT_OP(SQObjectPtr &o,SQObjectPtr &target)
 642 {
 643         switch(type(o)) {
 644                 case OT_TABLE: target = _table(o)->_delegate?SQObjectPtr(_table(o)->_delegate):_null_;
 645                         break;
 646                 case OT_CLASS: target = _class(o)->_base?_class(o)->_base:_null_;
 647                         break;
 648                 default:
 649                         Raise_Error(_SC("the %s type doesn't have a parent slot"), GetTypeName(o));
 650                         return false;
 651         }
 652         return true;
 653 }
 654
 655 bool SQVM::Execute(SQObjectPtr &closure, SQInteger target, SQInteger nargs, SQInteger stackbase,SQObjectPtr &outres, SQBool raiseerror,ExecutionType et)
 656 {
 657         if ((_nnativecalls + 1) > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
 658         _nnativecalls++;
 659         AutoDec ad(&_nnativecalls);
 660         SQInteger traps = 0;
 661         //temp_reg vars for OP_CALL
 662         SQInteger ct_target;
 663         SQInteger ct_stackbase;
 664         bool ct_tailcall;
 665
 666         switch(et) {
 667                 case ET_CALL:
 668                         if(!StartCall(_closure(closure), _top - nargs, nargs, stackbase, false)) {
 669                                 //call the handler if there are no calls in the stack, if not relies on the previous node
 670                                 if(ci == NULL) CallErrorHandler(_lasterror);
 671                                 return false;
 672                         }
 673                         ci->_root = SQTrue;
 674                         break;
 675                 case ET_RESUME_GENERATOR: _generator(closure)->Resume(this, target); ci->_root = SQTrue; traps += ci->_etraps; break;
 676                 case ET_RESUME_VM:
 677                         traps = _suspended_traps;
 678                         ci->_root = _suspended_root;
 679                         ci->_vargs = _suspend_varargs;
 680                         _suspended = SQFalse;
 681                         break;
 682         }
 683
 684 exception_restore:
 685         //
 686         {
 687                 for(;;)
 688                 {
 689                         const SQInstruction &_i_ = *ci->_ip++;
 690                         //dumpstack(_stackbase);
 691                         //scprintf("\n[%d] %s %d %d %d %d\n",ci->_ip-ci->_iv->_vals,g_InstrDesc[_i_.op].name,arg0,arg1,arg2,arg3);
 692                         switch(_i_.op)
 693                         {
 694                         case _OP_LINE:
 695                                 if(type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
 696                                         CallDebugHook(_SC('l'),arg1);
 697                                 continue;
 698                         case _OP_LOAD: TARGET = ci->_literals[arg1]; continue;
 699                         case _OP_LOADINT: TARGET = (SQInteger)arg1; continue;
 700                         case _OP_LOADFLOAT: TARGET = *((SQFloat *)&arg1); continue;
 701                         case _OP_DLOAD: TARGET = ci->_literals[arg1]; STK(arg2) = ci->_literals[arg3];continue;
 702                         case _OP_TAILCALL:
 703                                 temp_reg = STK(arg1);
 704                                 if (type(temp_reg) == OT_CLOSURE){
 705                                         ct_tailcall = true;
 706                                         if(ci->_vargs.size) PopVarArgs(ci->_vargs);
 707                                         for (SQInteger i = 0; i < arg3; i++) STK(i) = STK(arg2 + i);
 708                                         ct_target = ci->_target;
 709                                         ct_stackbase = _stackbase;
 710                                         goto common_call;
 711                                 }
 712                         case _OP_CALL: {
 713                                         ct_tailcall = false;
 714                                         ct_target = arg0;
 715                                         temp_reg = STK(arg1);
 716                                         ct_stackbase = _stackbase+arg2;
 717
 718 common_call:
 719                                         SQObjectPtr clo = temp_reg;
 720                                         SQInteger last_top = _top;
 721                                         switch (type(clo)) {
 722                                         case OT_CLOSURE:{
 723                                                 _GUARD(StartCall(_closure(clo), ct_target, arg3, ct_stackbase, ct_tailcall));
 724                                                 if (_funcproto(_closure(clo)->_function)->_bgenerator) {
 725                                                         SQGenerator *gen = SQGenerator::Create(_ss(this), _closure(clo));
 726                                                         _GUARD(gen->Yield(this));
 727                                                         Return(1, ct_target, clo);
 728                                                         STK(ct_target) = gen;
 729                                                         while (last_top >= _top) _stack._vals[last_top--].Null();
 730                                                         continue;
 731                                                 }
 732                                                 }
 733                                                 continue;
 734                                         case OT_NATIVECLOSURE: {
 735                                                 bool suspend;
 736                                                 _GUARD(CallNative(_nativeclosure(clo), arg3, ct_stackbase, clo,suspend));
 737                                                 if(suspend){
 738                                                         _suspended = SQTrue;
 739                                                         _suspended_target = ct_target;
 740                                                         _suspended_root = ci->_root;
 741                                                         _suspended_traps = traps;
 742                                                         _suspend_varargs = ci->_vargs;
 743                                                         outres = clo;
 744                                                         return true;
 745                                                 }
 746                                                 if(ct_target != -1) { //skip return value for constructors
 747                                                         STK(ct_target) = clo;
 748                                                 }
 749                                                                                    }
 750                                                 continue;
 751                                         case OT_CLASS:{
 752                                                 SQObjectPtr inst;
 753                                                 _GUARD(CreateClassInstance(_class(clo),inst,temp_reg));
 754                                                 STK(ct_target) = inst;
 755                                                 ct_target = -1; //fakes return value target so that is not overwritten by the constructor
 756                                                 if(type(temp_reg) != OT_NULL) {
 757                                                         _stack._vals[ct_stackbase] = inst;
 758                                                         goto common_call; //hard core spaghetti code(reissues the OP_CALL to invoke the constructor)
 759                                                 }
 760                                                 }
 761                                                 break;
 762                                         case OT_TABLE:
 763                                         case OT_USERDATA:
 764                                         case OT_INSTANCE:
 765                                                 {
 766                                                 Push(clo);
 767                                                 for (SQInteger i = 0; i < arg3; i++) Push(STK(arg2 + i));
 768                                                 if (_delegable(clo) && CallMetaMethod(_delegable(clo), MT_CALL, arg3+1, clo)){
 769                                                         STK(ct_target) = clo;
 770                                                         break;
 771                                                 }
 772                                                 Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
 773                                                 SQ_THROW();
 774                                           }
 775                                         default:
 776                                                 Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
 777                                                 SQ_THROW();
 778                                         }
 779                                 }
 780                                   continue;
 781                         case _OP_PREPCALL:
 782                         case _OP_PREPCALLK:
 783                                 {
 784                                         SQObjectPtr &key = _i_.op == _OP_PREPCALLK?(ci->_literals)[arg1]:STK(arg1);
 785                                         SQObjectPtr &o = STK(arg2);
 786                                         if (!Get(o, key, temp_reg,false,true)) {
 787                                                 if(type(o) == OT_CLASS) { //hack?
 788                                                         if(_class_ddel->Get(key,temp_reg)) {
 789                                                                 STK(arg3) = o;
 790                                                                 TARGET = temp_reg;
 791                                                                 continue;
 792                                                         }
 793                                                 }
 794                                                 { Raise_IdxError(key); SQ_THROW();}
 795                                         }
 796
 797                                         STK(arg3) = type(o) == OT_CLASS?STK(0):o;
 798                                         TARGET = temp_reg;
 799                                 }
 800                                 continue;
 801                         case _OP_GETK:
 802                                 if (!Get(STK(arg2), ci->_literals[arg1], temp_reg, false,true)) { Raise_IdxError(ci->_literals[arg1]); SQ_THROW();}
 803                                 TARGET = temp_reg;
 804                                 continue;
 805                         case _OP_MOVE: TARGET = STK(arg1); continue;
 806                         case _OP_NEWSLOT:
 807                                 _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),false));
 808                                 if(arg0 != arg3) TARGET = STK(arg3);
 809                                 continue;
 810                         case _OP_DELETE: _GUARD(DeleteSlot(STK(arg1), STK(arg2), TARGET)); continue;
 811                         case _OP_SET:
 812                                 if (!Set(STK(arg1), STK(arg2), STK(arg3),true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
 813                                 if (arg0 != arg3) TARGET = STK(arg3);
 814                                 continue;
 815                         case _OP_GET:
 816                                 if (!Get(STK(arg1), STK(arg2), temp_reg, false,true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
 817                                 TARGET = temp_reg;
 818                                 continue;
 819                         case _OP_EQ:{
 820                                 bool res;
 821                                 if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
 822                                 TARGET = res?_true_:_false_;
 823                                 }continue;
 824                         case _OP_NE:{
 825                                 bool res;
 826                                 if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
 827                                 TARGET = (!res)?_true_:_false_;
 828                                 } continue;
 829                         case _OP_ARITH: _GUARD(ARITH_OP( arg3 , temp_reg, STK(arg2), STK(arg1))); TARGET = temp_reg; continue;
 830                         case _OP_BITW:  _GUARD(BW_OP( arg3,TARGET,STK(arg2),STK(arg1))); continue;
 831                         case _OP_RETURN:
 832                                 if(ci->_generator) {
 833                                         ci->_generator->Kill();
 834                                 }
 835                                 if(Return(arg0, arg1, temp_reg)){
 836                                         assert(traps==0);
 837                                         outres = temp_reg;
 838                                         return true;
 839                                 }
 840                                 continue;
 841                         case _OP_LOADNULLS:{ for(SQInt32 n=0; n < arg1; n++) STK(arg0+n) = _null_; }continue;
 842                         case _OP_LOADROOTTABLE: TARGET = _roottable; continue;
 843                         case _OP_LOADBOOL: TARGET = arg1?_true_:_false_; continue;
 844                         case _OP_DMOVE: STK(arg0) = STK(arg1); STK(arg2) = STK(arg3); continue;
 845                         case _OP_JMP: ci->_ip += (sarg1); continue;
 846                         case _OP_JNZ: if(!IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
 847                         case _OP_JZ: if(IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
 848                         case _OP_LOADFREEVAR: TARGET = _closure(ci->_closure)->_outervalues[arg1]; continue;
 849                         case _OP_VARGC: TARGET = SQInteger(ci->_vargs.size); continue;
 850                         case _OP_GETVARGV:
 851                                 if(!GETVARGV_OP(TARGET,STK(arg1),ci)) { SQ_THROW(); }
 852                                 continue;
 853                         case _OP_NEWTABLE: TARGET = SQTable::Create(_ss(this), arg1); continue;
 854                         case _OP_NEWARRAY: TARGET = SQArray::Create(_ss(this), 0); _array(TARGET)->Reserve(arg1); continue;
 855                         case _OP_APPENDARRAY: _array(STK(arg0))->Append(COND_LITERAL);  continue;
 856                         case _OP_GETPARENT: _GUARD(GETPARENT_OP(STK(arg1),TARGET)); continue;
 857                         case _OP_COMPARITH: _GUARD(DerefInc(arg3, TARGET, STK((((SQUnsignedInteger)arg1&0xFFFF0000)>>16)), STK(arg2), STK(arg1&0x0000FFFF), false)); continue;
 858                         case _OP_COMPARITHL: _GUARD(LOCAL_INC(arg3, TARGET, STK(arg1), STK(arg2))); continue;
 859                         case _OP_INC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, false));} continue;
 860                         case _OP_INCL: {SQObjectPtr o(sarg3); _GUARD(LOCAL_INC('+',TARGET, STK(arg1), o));} continue;
 861                         case _OP_PINC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, true));} continue;
 862                         case _OP_PINCL: {SQObjectPtr o(sarg3); _GUARD(PLOCAL_INC('+',TARGET, STK(arg1), o));} continue;
 863                         case _OP_CMP:   _GUARD(CMP_OP((CmpOP)arg3,STK(arg2),STK(arg1),TARGET))  continue;
 864                         case _OP_EXISTS: TARGET = Get(STK(arg1), STK(arg2), temp_reg, true,false)?_true_:_false_;continue;
 865                         case _OP_INSTANCEOF:
 866                                 if(type(STK(arg1)) != OT_CLASS || type(STK(arg2)) != OT_INSTANCE)
 867                                 {Raise_Error(_SC("cannot apply instanceof between a %s and a %s"),GetTypeName(STK(arg1)),GetTypeName(STK(arg2))); SQ_THROW();}
 868                                 TARGET = _instance(STK(arg2))->InstanceOf(_class(STK(arg1)))?_true_:_false_;
 869                                 continue;
 870                         case _OP_AND:
 871                                 if(IsFalse(STK(arg2))) {
 872                                         TARGET = STK(arg2);
 873                                         ci->_ip += (sarg1);
 874                                 }
 875                                 continue;
 876                         case _OP_OR:
 877                                 if(!IsFalse(STK(arg2))) {
 878                                         TARGET = STK(arg2);
 879                                         ci->_ip += (sarg1);
 880                                 }
 881                                 continue;
 882                         case _OP_NEG: _GUARD(NEG_OP(TARGET,STK(arg1))); continue;
 883                         case _OP_NOT: TARGET = (IsFalse(STK(arg1))?_true_:_false_); continue;
 884                         case _OP_BWNOT:
 885                                 if(type(STK(arg1)) == OT_INTEGER) {
 886                                         SQInteger t = _integer(STK(arg1));
 887                                         TARGET = SQInteger(~t);
 888                                         continue;
 889                                 }
 890                                 Raise_Error(_SC("attempt to perform a bitwise op on a %s"), GetTypeName(STK(arg1)));
 891                                 SQ_THROW();
 892                         case _OP_CLOSURE: {
 893                                 SQClosure *c = ci->_closure._unVal.pClosure;
 894                                 SQFunctionProto *fp = c->_function._unVal.pFunctionProto;
 895                                 if(!CLOSURE_OP(TARGET,fp->_functions[arg1]._unVal.pFunctionProto)) { SQ_THROW(); }
 896                                 continue;
 897                         }
 898                         case _OP_YIELD:{
 899                                 if(ci->_generator) {
 900                                         if(sarg1 != MAX_FUNC_STACKSIZE) temp_reg = STK(arg1);
 901                                         _GUARD(ci->_generator->Yield(this));
 902                                         traps -= ci->_etraps;
 903                                         if(sarg1 != MAX_FUNC_STACKSIZE) STK(arg1) = temp_reg;
 904                                 }
 905                                 else { Raise_Error(_SC("trying to yield a '%s',only genenerator can be yielded"), GetTypeName(ci->_generator)); SQ_THROW();}
 906                                 if(Return(arg0, arg1, temp_reg)){
 907                                         assert(traps == 0);
 908                                         outres = temp_reg;
 909                                         return true;
 910                                 }
 911
 912                                 }
 913                                 continue;
 914                         case _OP_RESUME:
 915                                 if(type(STK(arg1)) != OT_GENERATOR){ Raise_Error(_SC("trying to resume a '%s',only genenerator can be resumed"), GetTypeName(STK(arg1))); SQ_THROW();}
 916                                 _GUARD(_generator(STK(arg1))->Resume(this, arg0));
 917                                 traps += ci->_etraps;
 918                 continue;
 919                         case _OP_FOREACH:{ int tojump;
 920                                 _GUARD(FOREACH_OP(STK(arg0),STK(arg2),STK(arg2+1),STK(arg2+2),arg2,sarg1,tojump));
 921                                 ci->_ip += tojump; }
 922                                 continue;
 923                         case _OP_POSTFOREACH:
 924                                 assert(type(STK(arg0)) == OT_GENERATOR);
 925                                 if(_generator(STK(arg0))->_state == SQGenerator::eDead)
 926                                         ci->_ip += (sarg1 - 1);
 927                                 continue;
 928                         case _OP_DELEGATE: _GUARD(DELEGATE_OP(TARGET,STK(arg1),STK(arg2))); continue;
 929                         case _OP_CLONE:
 930                                 if(!Clone(STK(arg1), TARGET))
 931                                 { Raise_Error(_SC("cloning a %s"), GetTypeName(STK(arg1))); SQ_THROW();}
 932                                 continue;
 933                         case _OP_TYPEOF: TypeOf(STK(arg1), TARGET); continue;
 934                         case _OP_PUSHTRAP:{
 935                                 SQInstruction *_iv = _funcproto(_closure(ci->_closure)->_function)->_instructions;
 936                                 _etraps.push_back(SQExceptionTrap(_top,_stackbase, &_iv[(ci->_ip-_iv)+arg1], arg0)); traps++;
 937                                 ci->_etraps++;
 938                                                           }
 939                                 continue;
 940                         case _OP_POPTRAP: {
 941                                 for(SQInteger i = 0; i < arg0; i++) {
 942                                         _etraps.pop_back(); traps--;
 943                                         ci->_etraps--;
 944                                 }
 945                                                           }
 946                                 continue;
 947                         case _OP_THROW: Raise_Error(TARGET); SQ_THROW(); continue;
 948                         case _OP_CLASS: _GUARD(CLASS_OP(TARGET,arg1,arg2)); continue;
 949                         case _OP_NEWSLOTA:
 950                                 bool bstatic = (arg0&NEW_SLOT_STATIC_FLAG)?true:false;
 951                                 if(type(STK(arg1)) == OT_CLASS) {
 952                                         if(type(_class(STK(arg1))->_metamethods[MT_NEWMEMBER]) != OT_NULL ) {
 953                                                 Push(STK(arg1)); Push(STK(arg2)); Push(STK(arg3));
 954                                                 Push((arg0&NEW_SLOT_ATTRIBUTES_FLAG) ? STK(arg2-1) : _null_);
 955                                                 int nparams = 4;
 956                                                 if(Call(_class(STK(arg1))->_metamethods[MT_NEWMEMBER], nparams, _top - nparams, temp_reg,SQFalse)) {
 957                                                         Pop(nparams);
 958                                                         continue;
 959                                                 }
 960                                         }
 961                                 }
 962                                 _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),bstatic));
 963                                 if((arg0&NEW_SLOT_ATTRIBUTES_FLAG)) {
 964                                         _class(STK(arg1))->SetAttributes(STK(arg2),STK(arg2-1));
 965                                 }
 966                                 continue;
 967                         }
 968
 969                 }
 970         }
 971 exception_trap:
 972         {
 973                 SQObjectPtr currerror = _lasterror;
 974 //              dumpstack(_stackbase);
 975                 SQInteger n = 0;
 976                 SQInteger last_top = _top;
 977                 if(ci) {
 978                         if(_ss(this)->_notifyallexceptions) CallErrorHandler(currerror);
 979
 980                         if(traps) {
 981                                 do {
 982                                         if(ci->_etraps > 0) {
 983                                                 SQExceptionTrap &et = _etraps.top();
 984                                                 ci->_ip = et._ip;
 985                                                 _top = et._stacksize;
 986                                                 _stackbase = et._stackbase;
 987                                                 _stack._vals[_stackbase+et._extarget] = currerror;
 988                                                 _etraps.pop_back(); traps--; ci->_etraps--;
 989                                                 while(last_top >= _top) _stack._vals[last_top--].Null();
 990                                                 goto exception_restore;
 991                                         }
 992                                         //if is a native closure
 993                                         if(type(ci->_closure) != OT_CLOSURE && n)
 994                                                 break;
 995                                         if(ci->_generator) ci->_generator->Kill();
 996                                         PopVarArgs(ci->_vargs);
 997                                         POP_CALLINFO(this);
 998                                         n++;
 999                                 } while(_callsstacksize);
1000                         }
1001                         else {
1002                                 //call the hook
1003                                 if(raiseerror && !_ss(this)->_notifyallexceptions)
1004                                         CallErrorHandler(currerror);
1005                         }
1006                         //remove call stack until a C function is found or the cstack is empty
1007                         if(ci) do {
1008                                 SQBool exitafterthisone = ci->_root;
1009                                 if(ci->_generator) ci->_generator->Kill();
1010                                 _stackbase -= ci->_prevstkbase;
1011                                 _top = _stackbase + ci->_prevtop;
1012                                 PopVarArgs(ci->_vargs);
1013                                 POP_CALLINFO(this);
1014                                 if( (ci && type(ci->_closure) != OT_CLOSURE) || exitafterthisone) break;
1015                         } while(_callsstacksize);
1016
1017                         while(last_top >= _top) _stack._vals[last_top--].Null();
1018                 }
1019                 _lasterror = currerror;
1020                 return false;
1021         }
1022         assert(0);
1023 }
1024
1025 bool SQVM::CreateClassInstance(SQClass *theclass, SQObjectPtr &inst, SQObjectPtr &constructor)
1026 {
1027         inst = theclass->CreateInstance();
1028         if(!theclass->Get(_ss(this)->_constructoridx,constructor)) {
1029                 //if(!Call(constr,nargs,stackbase,constr,false))
1030                 //      return false;
1031                 constructor = _null_;
1032         }
1033         return true;
1034 }
1035
1036 void SQVM::CallErrorHandler(SQObjectPtr &error)
1037 {
1038         if(type(_errorhandler) != OT_NULL) {
1039                 SQObjectPtr out;
1040                 Push(_roottable); Push(error);
1041                 Call(_errorhandler, 2, _top-2, out,SQFalse);
1042                 Pop(2);
1043         }
1044 }
1045
1046 void SQVM::CallDebugHook(SQInteger type,SQInteger forcedline)
1047 {
1048         SQObjectPtr temp_reg;
1049         SQInteger nparams=5;
1050         SQFunctionProto *func=_funcproto(_closure(ci->_closure)->_function);
1051         Push(_roottable); Push(type); Push(func->_sourcename); Push(forcedline?forcedline:func->GetLine(ci->_ip)); Push(func->_name);
1052         Call(_debughook,nparams,_top-nparams,temp_reg,SQFalse);
1053         Pop(nparams);
1054 }
1055
1056 bool SQVM::CallNative(SQNativeClosure *nclosure,SQInteger nargs,SQInteger stackbase,SQObjectPtr &retval,bool &suspend)
1057 {
1058         if (_nnativecalls + 1 > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
1059         SQInteger nparamscheck = nclosure->_nparamscheck;
1060         if(((nparamscheck > 0) && (nparamscheck != nargs))
1061                 || ((nparamscheck < 0) && (nargs < (-nparamscheck)))) {
1062                 Raise_Error(_SC("wrong number of parameters"));
1063                 return false;
1064                 }
1065
1066         SQInteger tcs;
1067         if((tcs = nclosure->_typecheck.size())) {
1068                 for(SQInteger i = 0; i < nargs && i < tcs; i++)
1069                         if((nclosure->_typecheck._vals[i] != -1) && !(type(_stack._vals[stackbase+i]) & nclosure->_typecheck[i])) {
1070                 Raise_ParamTypeError(i,nclosure->_typecheck._vals[i],type(_stack._vals[stackbase+i]));
1071                                 return false;
1072                         }
1073         }
1074         _nnativecalls++;
1075         if ((_top + MIN_STACK_OVERHEAD) > (SQInteger)_stack.size()) {
1076                 _stack.resize(_stack.size() + (MIN_STACK_OVERHEAD<<1));
1077         }
1078         SQInteger oldtop = _top;
1079         SQInteger oldstackbase = _stackbase;
1080         _top = stackbase + nargs;
1081         CallInfo lci;
1082         lci._closure = nclosure;
1083         lci._generator = NULL;
1084         lci._etraps = 0;
1085         lci._prevstkbase = (SQInt32) (stackbase - _stackbase);
1086         lci._ncalls = 1;
1087         lci._prevtop = (SQInt32) (oldtop - oldstackbase);
1088         PUSH_CALLINFO(this, lci);
1089         _stackbase = stackbase;
1090         //push free variables
1091         SQInteger outers = nclosure->_outervalues.size();
1092         for (SQInteger i = 0; i < outers; i++) {
1093                 Push(nclosure->_outervalues[i]);
1094         }
1095
1096         if(type(nclosure->_env) == OT_WEAKREF) {
1097                 _stack[stackbase] = _weakref(nclosure->_env)->_obj;
1098         }
1099
1100
1101         SQInteger ret = (nclosure->_function)(this);
1102         _nnativecalls--;
1103         suspend = false;
1104         if( ret == SQ_SUSPEND_FLAG) suspend = true;
1105         else if (ret < 0) {
1106                 _stackbase = oldstackbase;
1107                 _top = oldtop;
1108                 POP_CALLINFO(this);
1109                 Raise_Error(_lasterror);
1110                 return false;
1111         }
1112
1113         if (ret != 0){ retval = TOP(); TOP().Null(); }
1114         else { retval = _null_; }
1115         _stackbase = oldstackbase;
1116         _top = oldtop;
1117         POP_CALLINFO(this);
1118         return true;
1119 }
1120
1121 bool SQVM::Get(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw, bool fetchroot)
1122 {
1123         switch(type(self)){
1124         case OT_TABLE:
1125                 if(_table(self)->Get(key,dest))return true;
1126                 break;
1127         case OT_ARRAY:
1128                 if(sq_isnumeric(key)){
1129                         return _array(self)->Get(tointeger(key),dest);
1130                 }
1131                 break;
1132         case OT_INSTANCE:
1133                 if(_instance(self)->Get(key,dest)) return true;
1134                 break;
1135         default:break; //shut up compiler
1136         }
1137         if(FallBackGet(self,key,dest,raw)) return true;
1138
1139         if(fetchroot) {
1140                 if(_rawval(STK(0)) == _rawval(self) &&
1141                         type(STK(0)) == type(self)) {
1142                                 return _table(_roottable)->Get(key,dest);
1143                 }
1144         }
1145         return false;
1146 }
1147
1148 bool SQVM::FallBackGet(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw)
1149 {
1150         switch(type(self)){
1151         case OT_CLASS:
1152                 return _class(self)->Get(key,dest);
1153                 break;
1154         case OT_TABLE:
1155         case OT_USERDATA:
1156         //delegation
1157                 if(_delegable(self)->_delegate) {
1158                         if(Get(SQObjectPtr(_delegable(self)->_delegate),key,dest,raw,false))
1159                                 return true;
1160                         if(raw)return false;
1161                         Push(self);Push(key);
1162                         if(CallMetaMethod(_delegable(self),MT_GET,2,dest))
1163                                 return true;
1164                 }
1165                 if(type(self) == OT_TABLE) {
1166                         if(raw) return false;
1167                         return _table_ddel->Get(key,dest);
1168                 }
1169                 return false;
1170                 break;
1171         case OT_ARRAY:
1172                 if(raw)return false;
1173                 return _array_ddel->Get(key,dest);
1174         case OT_STRING:
1175                 if(sq_isnumeric(key)){
1176                         SQInteger n=tointeger(key);
1177                         if(abs((int)n)<_string(self)->_len){
1178                                 if(n<0)n=_string(self)->_len-n;
1179                                 dest=SQInteger(_stringval(self)[n]);
1180                                 return true;
1181                         }
1182                         return false;
1183                 }
1184                 else {
1185                         if(raw)return false;
1186                         return _string_ddel->Get(key,dest);
1187                 }
1188                 break;
1189         case OT_INSTANCE:
1190                 if(raw)return false;
1191                 Push(self);Push(key);
1192                 if(!CallMetaMethod(_delegable(self),MT_GET,2,dest)) {
1193                         return _instance_ddel->Get(key,dest);
1194                 }
1195                 return true;
1196         case OT_INTEGER:case OT_FLOAT:case OT_BOOL:
1197                 if(raw)return false;
1198                 return _number_ddel->Get(key,dest);
1199         case OT_GENERATOR:
1200                 if(raw)return false;
1201                 return _generator_ddel->Get(key,dest);
1202         case OT_CLOSURE: case OT_NATIVECLOSURE:
1203                 if(raw)return false;
1204                 return _closure_ddel->Get(key,dest);
1205         case OT_THREAD:
1206                 if(raw)return false;
1207                 return  _thread_ddel->Get(key,dest);
1208         case OT_WEAKREF:
1209                 if(raw)return false;
1210                 return  _weakref_ddel->Get(key,dest);
1211         default:return false;
1212         }
1213         return false;
1214 }
1215
1216 bool SQVM::Set(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool fetchroot)
1217 {
1218         switch(type(self)){
1219         case OT_TABLE:
1220                 if(_table(self)->Set(key,val))
1221                         return true;
1222                 if(_table(self)->_delegate) {
1223                         if(Set(_table(self)->_delegate,key,val,false)) {
1224                                 return true;
1225                         }
1226                 }
1227                 //keeps going
1228         case OT_USERDATA:
1229                 if(_delegable(self)->_delegate) {
1230                         SQObjectPtr t;
1231                         Push(self);Push(key);Push(val);
1232                         if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
1233                 }
1234                 break;
1235         case OT_INSTANCE:{
1236                 if(_instance(self)->Set(key,val))
1237                         return true;
1238                 SQObjectPtr t;
1239                 Push(self);Push(key);Push(val);
1240                 if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
1241                 }
1242                 break;
1243         case OT_ARRAY:
1244                 if(!sq_isnumeric(key)) {Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key)); return false; }
1245                 return _array(self)->Set(tointeger(key),val);
1246         default:
1247                 Raise_Error(_SC("trying to set '%s'"),GetTypeName(self));
1248                 return false;
1249         }
1250         if(fetchroot) {
1251                 if(_rawval(STK(0)) == _rawval(self) &&
1252                         type(STK(0)) == type(self)) {
1253                                 return _table(_roottable)->Set(key,val);
1254                         }
1255         }
1256         return false;
1257 }
1258
1259 bool SQVM::Clone(const SQObjectPtr &self,SQObjectPtr &target)
1260 {
1261         SQObjectPtr temp_reg;
1262         SQObjectPtr newobj;
1263         switch(type(self)){
1264         case OT_TABLE:
1265                 newobj = _table(self)->Clone();
1266                 goto cloned_mt;
1267         case OT_INSTANCE:
1268                 newobj = _instance(self)->Clone(_ss(this));
1269 cloned_mt:
1270                 if(_delegable(newobj)->_delegate){
1271                         Push(newobj);
1272                         Push(self);
1273                         CallMetaMethod(_delegable(newobj),MT_CLONED,2,temp_reg);
1274                 }
1275                 target = newobj;
1276                 return true;
1277         case OT_ARRAY:
1278                 target = _array(self)->Clone();
1279                 return true;
1280         default: return false;
1281         }
1282 }
1283
1284 bool SQVM::NewSlot(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool bstatic)
1285 {
1286         if(type(key) == OT_NULL) { Raise_Error(_SC("null cannot be used as index")); return false; }
1287         switch(type(self)) {
1288         case OT_TABLE: {
1289                 bool rawcall = true;
1290                 if(_table(self)->_delegate) {
1291                         SQObjectPtr res;
1292                         if(!_table(self)->Get(key,res)) {
1293                                 Push(self);Push(key);Push(val);
1294                                 rawcall = !CallMetaMethod(_table(self),MT_NEWSLOT,3,res);
1295                         }
1296                 }
1297                 if(rawcall) _table(self)->NewSlot(key,val); //cannot fail
1298
1299                 break;}
1300         case OT_INSTANCE: {
1301                 SQObjectPtr res;
1302                 Push(self);Push(key);Push(val);
1303                 if(!CallMetaMethod(_instance(self),MT_NEWSLOT,3,res)) {
1304                         Raise_Error(_SC("class instances do not support the new slot operator"));
1305                         return false;
1306                 }
1307                 break;}
1308         case OT_CLASS:
1309                 if(!_class(self)->NewSlot(_ss(this),key,val,bstatic)) {
1310                         if(_class(self)->_locked) {
1311                                 Raise_Error(_SC("trying to modify a class that has already been instantiated"));
1312                                 return false;
1313                         }
1314                         else {
1315                                 SQObjectPtr oval = PrintObjVal(key);
1316                                 Raise_Error(_SC("the property '%s' already exists"),_stringval(oval));
1317                                 return false;
1318                         }
1319                 }
1320                 break;
1321         default:
1322                 Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key));
1323                 return false;
1324                 break;
1325         }
1326         return true;
1327 }
1328
1329 bool SQVM::DeleteSlot(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &res)
1330 {
1331         switch(type(self)) {
1332         case OT_TABLE:
1333         case OT_INSTANCE:
1334         case OT_USERDATA: {
1335                 SQObjectPtr t;
1336                 bool handled = false;
1337                 if(_delegable(self)->_delegate) {
1338                         Push(self);Push(key);
1339                         handled = CallMetaMethod(_delegable(self),MT_DELSLOT,2,t);
1340                 }
1341
1342                 if(!handled) {
1343                         if(type(self) == OT_TABLE) {
1344                                 if(_table(self)->Get(key,t)) {
1345                                         _table(self)->Remove(key);
1346                                 }
1347                                 else {
1348                                         Raise_IdxError((SQObject &)key);
1349                                         return false;
1350                                 }
1351                         }
1352                         else {
1353                                 Raise_Error(_SC("cannot delete a slot from %s"),GetTypeName(self));
1354                                 return false;
1355                         }
1356                 }
1357                 res = t;
1358                                 }
1359                 break;
1360         default:
1361                 Raise_Error(_SC("attempt to delete a slot from a %s"),GetTypeName(self));
1362                 return false;
1363         }
1364         return true;
1365 }
1366
1367 bool SQVM::Call(SQObjectPtr &closure,SQInteger nparams,SQInteger stackbase,SQObjectPtr &outres,SQBool raiseerror)
1368 {
1369 #ifdef _DEBUG
1370 SQInteger prevstackbase = _stackbase;
1371 #endif
1372         switch(type(closure)) {
1373         case OT_CLOSURE:
1374                 return Execute(closure, _top - nparams, nparams, stackbase,outres,raiseerror);
1375                 break;
1376         case OT_NATIVECLOSURE:{
1377                 bool suspend;
1378                 return CallNative(_nativeclosure(closure), nparams, stackbase, outres,suspend);
1379
1380                                                   }
1381                 break;
1382         case OT_CLASS: {
1383                 SQObjectPtr constr;
1384                 SQObjectPtr temp;
1385                 CreateClassInstance(_class(closure),outres,constr);
1386                 if(type(constr) != OT_NULL) {
1387                         _stack[stackbase] = outres;
1388                         return Call(constr,nparams,stackbase,temp,raiseerror);
1389                 }
1390                 return true;
1391                                    }
1392                 break;
1393         default:
1394                 return false;
1395         }
1396 #ifdef _DEBUG
1397         if(!_suspended) {
1398                 assert(_stackbase == prevstackbase);
1399         }
1400 #endif
1401         return true;
1402 }
1403
1404 bool SQVM::CallMetaMethod(SQDelegable *del,SQMetaMethod mm,SQInteger nparams,SQObjectPtr &outres)
1405 {
1406         SQObjectPtr closure;
1407         if(del->GetMetaMethod(this, mm, closure)) {
1408                 if(Call(closure, nparams, _top - nparams, outres, SQFalse)) {
1409                         Pop(nparams);
1410                         return true;
1411                 }
1412         }
1413         Pop(nparams);
1414         return false;
1415 }
1416
1417 void SQVM::Remove(SQInteger n) {
1418         n = (n >= 0)?n + _stackbase - 1:_top + n;
1419         for(SQInteger i = n; i < _top; i++){
1420                 _stack[i] = _stack[i+1];
1421         }
1422         _stack[_top] = _null_;
1423         _top--;
1424 }
1425
1426 void SQVM::Pop() {
1427         _stack[--_top] = _null_;
1428 }
1429
1430 void SQVM::Pop(SQInteger n) {
1431         for(SQInteger i = 0; i < n; i++){
1432                 _stack[--_top] = _null_;
1433         }
1434 }
1435
1436 void SQVM::Push(const SQObjectPtr &o) { _stack[_top++] = o; }
1437 SQObjectPtr &SQVM::Top() { return _stack[_top-1]; }
1438 SQObjectPtr &SQVM::PopGet() { return _stack[--_top]; }
1439 SQObjectPtr &SQVM::GetUp(SQInteger n) { return _stack[_top+n]; }
1440 SQObjectPtr &SQVM::GetAt(SQInteger n) { return _stack[n]; }
1441
1442 #ifdef _DEBUG_DUMP
1443 void SQVM::dumpstack(SQInteger stackbase,bool dumpall)
1444 {
1445         SQInteger size=dumpall?_stack.size():_top;
1446         SQInteger n=0;
1447         scprintf(_SC("\n>>>>stack dump<<<<\n"));
1448         CallInfo &ci=_callsstack[_callsstacksize-1];
1449         scprintf(_SC("IP: %p\n"),ci._ip);
1450         scprintf(_SC("prev stack base: %d\n"),ci._prevstkbase);
1451         scprintf(_SC("prev top: %d\n"),ci._prevtop);
1452         for(SQInteger i=0;i<size;i++){
1453                 SQObjectPtr &obj=_stack[i];
1454                 if(stackbase==i)scprintf(_SC(">"));else scprintf(_SC(" "));
1455                 scprintf(_SC("[%d]:"),n);
1456                 switch(type(obj)){
1457                 case OT_FLOAT:                  scprintf(_SC("FLOAT %.3f"),_float(obj));break;
1458                 case OT_INTEGER:                scprintf(_SC("INTEGER %d"),_integer(obj));break;
1459                 case OT_BOOL:                   scprintf(_SC("BOOL %s"),_integer(obj)?"true":"false");break;
1460                 case OT_STRING:                 scprintf(_SC("STRING %s"),_stringval(obj));break;
1461                 case OT_NULL:                   scprintf(_SC("NULL"));  break;
1462                 case OT_TABLE:                  scprintf(_SC("TABLE %p[%p]"),_table(obj),_table(obj)->_delegate);break;
1463                 case OT_ARRAY:                  scprintf(_SC("ARRAY %p"),_array(obj));break;
1464                 case OT_CLOSURE:                scprintf(_SC("CLOSURE [%p]"),_closure(obj));break;
1465                 case OT_NATIVECLOSURE:  scprintf(_SC("NATIVECLOSURE"));break;
1466                 case OT_USERDATA:               scprintf(_SC("USERDATA %p[%p]"),_userdataval(obj),_userdata(obj)->_delegate);break;
1467                 case OT_GENERATOR:              scprintf(_SC("GENERATOR %p"),_generator(obj));break;
1468                 case OT_THREAD:                 scprintf(_SC("THREAD [%p]"),_thread(obj));break;
1469                 case OT_USERPOINTER:    scprintf(_SC("USERPOINTER %p"),_userpointer(obj));break;
1470                 case OT_CLASS:                  scprintf(_SC("CLASS %p"),_class(obj));break;
1471                 case OT_INSTANCE:               scprintf(_SC("INSTANCE %p"),_instance(obj));break;
1472                 case OT_WEAKREF:                scprintf(_SC("WEAKERF %p"),_weakref(obj));break;
1473                 default:
1474                         assert(0);
1475                         break;
1476                 };
1477                 scprintf(_SC("\n"));
1478                 ++n;
1479         }
1480 }
1481
1482
1483
1484 #endif