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