sqvm.cpp

00001 /*
00002   see copyright notice in squirrel.h
00003 */
00004 #include <squirrel.h>
00005 #include "sqpcheader.h"
00006 #include <math.h>
00007 #include <stdlib.h>
00008 #include "sqopcodes.h"
00009 #include "sqfuncproto.h"
00010 #include "sqvm.h"
00011 #include "sqclosure.h"
00012 #include "sqstring.h"
00013 #include "sqtable.h"
00014 #include "squserdata.h"
00015 #include "sqarray.h"
00016 #include "sqclass.h"
00017 
00018 #define TOP() (_stack._vals[_top-1])
00019 
00020 bool SQVM::BW_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
00021 {
00022   SQInteger res;
00023   SQInteger i1 = _integer(o1), i2 = _integer(o2);
00024   if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER))
00025   {
00026     switch(op) {
00027       case BW_AND:  res = i1 & i2; break;
00028       case BW_OR:   res = i1 | i2; break;
00029       case BW_XOR:  res = i1 ^ i2; break;
00030       case BW_SHIFTL: res = i1 << i2; break;
00031       case BW_SHIFTR: res = i1 >> i2; break;
00032       case BW_USHIFTR:res = (SQInteger)(*((SQUnsignedInteger*)&i1) >> i2); break;
00033       default: { Raise_Error(_SC("internal vm error bitwise op failed")); return false; }
00034     }
00035   }
00036   else { Raise_Error(_SC("bitwise op between '%s' and '%s'"),GetTypeName(o1),GetTypeName(o2)); return false;}
00037   trg = res;
00038   return true;
00039 }
00040 
00041 bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
00042 {
00043   if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
00044       if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER)) {
00045         SQInteger res, i1 = _integer(o1), i2 = _integer(o2);
00046         switch(op) {
00047         case '+': res = i1 + i2; break;
00048         case '-': res = i1 - i2; break;
00049         case '/': if(i2 == 0) { Raise_Error(_SC("division by zero")); return false; }
00050           res = i1 / i2;
00051           break;
00052         case '*': res = i1 * i2; break;
00053         case '%': res = i1 % i2; break;
00054         default: res = 0xDEADBEEF;
00055         }
00056         trg = res;
00057       }else{
00058         SQFloat res, f1 = tofloat(o1), f2 = tofloat(o2);
00059         switch(op) {
00060         case '+': res = f1 + f2; break;
00061         case '-': res = f1 - f2; break;
00062         case '/': res = f1 / f2; break;
00063         case '*': res = f1 * f2; break;
00064         case '%': res = SQFloat(fmod((double)f1,(double)f2)); break;
00065         default: res = 0x0f;
00066         }
00067         trg = res;
00068       }
00069     } else {
00070       if(op == '+' && (type(o1) == OT_STRING || type(o2) == OT_STRING)){
00071           if(!StringCat(o1, o2, trg)) return false;
00072       }
00073       else if(!ArithMetaMethod(op,o1,o2,trg)) {
00074         Raise_Error(_SC("arith op %c on between '%s' and '%s'"),op,GetTypeName(o1),GetTypeName(o2)); return false;
00075       }
00076     }
00077     return true;
00078 }
00079 
00080 SQVM::SQVM(SQSharedState *ss)
00081 {
00082   _sharedstate=ss;
00083   _suspended = SQFalse;
00084   _suspended_target=-1;
00085   _suspended_root = SQFalse;
00086   _suspended_traps=0;
00087   _foreignptr=NULL;
00088   _nnativecalls=0;
00089   _lasterror = _null_;
00090   _errorhandler = _null_;
00091   _debughook = _null_;
00092   _can_suspend = false;
00093   _ops_till_suspend = 0;
00094   ci = NULL;
00095   INIT_CHAIN();ADD_TO_CHAIN(&_ss(this)->_gc_chain,this);
00096 }
00097 
00098 void SQVM::Finalize()
00099 {
00100   _roottable = _null_;
00101   _lasterror = _null_;
00102   _errorhandler = _null_;
00103   _debughook = _null_;
00104   temp_reg = _null_;
00105   _callstackdata.resize(0);
00106   SQInteger size=_stack.size();
00107   for(SQInteger i=size - 1;i>=0;i--)
00108     _stack[i]=_null_;
00109 }
00110 
00111 SQVM::~SQVM()
00112 {
00113   Finalize();
00114   //sq_free(_callsstack,_alloccallsstacksize*sizeof(CallInfo));
00115   REMOVE_FROM_CHAIN(&_ss(this)->_gc_chain,this);
00116 }
00117 
00118 bool SQVM::ArithMetaMethod(SQInteger op,const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &dest)
00119 {
00120   SQMetaMethod mm;
00121   switch(op){
00122     case _SC('+'): mm=MT_ADD; break;
00123     case _SC('-'): mm=MT_SUB; break;
00124     case _SC('/'): mm=MT_DIV; break;
00125     case _SC('*'): mm=MT_MUL; break;
00126     case _SC('%'): mm=MT_MODULO; break;
00127     default: mm = MT_ADD; assert(0); break; //shutup compiler
00128   }
00129   if(is_delegable(o1) && _delegable(o1)->_delegate) {
00130     Push(o1);Push(o2);
00131     return CallMetaMethod(_delegable(o1),mm,2,dest);
00132   }
00133   return false;
00134 }
00135 
00136 bool SQVM::NEG_OP(SQObjectPtr &trg,const SQObjectPtr &o)
00137 {
00138 
00139   switch(type(o)) {
00140   case OT_INTEGER:
00141     trg = -_integer(o);
00142     return true;
00143   case OT_FLOAT:
00144     trg = -_float(o);
00145     return true;
00146   case OT_TABLE:
00147   case OT_USERDATA:
00148   case OT_INSTANCE:
00149     if(_delegable(o)->_delegate) {
00150       Push(o);
00151       if(CallMetaMethod(_delegable(o), MT_UNM, 1, temp_reg)) {
00152         trg = temp_reg;
00153         return true;
00154       }
00155     }
00156   default:break; //shutup compiler
00157   }
00158   Raise_Error(_SC("attempt to negate a %s"), GetTypeName(o));
00159   return false;
00160 }
00161 
00162 #define _RET_SUCCEED(exp) { result = (exp); return true; }
00163 bool SQVM::ObjCmp(const SQObjectPtr &o1,const SQObjectPtr &o2,SQInteger &result)
00164 {
00165   if(type(o1)==type(o2)){
00166     if(_userpointer(o1)==_userpointer(o2))_RET_SUCCEED(0);
00167     SQObjectPtr res;
00168     switch(type(o1)){
00169     case OT_STRING:
00170       _RET_SUCCEED(scstrcmp(_stringval(o1),_stringval(o2)));
00171     case OT_INTEGER:
00172       _RET_SUCCEED(_integer(o1)-_integer(o2));
00173     case OT_FLOAT:
00174       _RET_SUCCEED((_float(o1)<_float(o2))?-1:1);
00175     case OT_TABLE:
00176     case OT_USERDATA:
00177     case OT_INSTANCE:
00178       if(_delegable(o1)->_delegate) {
00179         Push(o1);Push(o2);
00180         if(CallMetaMethod(_delegable(o1),MT_CMP,2,res)) break;
00181       }
00182       //continues through (no break needed)
00183     default:
00184       _RET_SUCCEED( _userpointer(o1) < _userpointer(o2)?-1:1 );
00185     }
00186     if(type(res)!=OT_INTEGER) { Raise_CompareError(o1,o2); return false; }
00187       _RET_SUCCEED(_integer(res));
00188 
00189   }
00190   else{
00191     if(sq_isnumeric(o1) && sq_isnumeric(o2)){
00192       if((type(o1)==OT_INTEGER) && (type(o2)==OT_FLOAT)) {
00193         if( _integer(o1)==_float(o2) ) { _RET_SUCCEED(0); }
00194         else if( _integer(o1)<_float(o2) ) { _RET_SUCCEED(-1); }
00195         _RET_SUCCEED(1);
00196       }
00197       else{
00198         if( _float(o1)==_integer(o2) ) { _RET_SUCCEED(0); }
00199         else if( _float(o1)<_integer(o2) ) { _RET_SUCCEED(-1); }
00200         _RET_SUCCEED(1);
00201       }
00202     }
00203     else if(type(o1)==OT_NULL) {_RET_SUCCEED(-1);}
00204     else if(type(o2)==OT_NULL) {_RET_SUCCEED(1);}
00205     else { Raise_CompareError(o1,o2); return false; }
00206 
00207   }
00208   assert(0);
00209   _RET_SUCCEED(0); //cannot happen
00210 }
00211 
00212 bool SQVM::CMP_OP(CmpOP op, const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &res)
00213 {
00214   SQInteger r;
00215   if(ObjCmp(o1,o2,r)) {
00216     switch(op) {
00217       case CMP_G: res = (r > 0)?_true_:_false_; return true;
00218       case CMP_GE: res = (r >= 0)?_true_:_false_; return true;
00219       case CMP_L: res = (r < 0)?_true_:_false_; return true;
00220       case CMP_LE: res = (r <= 0)?_true_:_false_; return true;
00221 
00222     }
00223     assert(0);
00224   }
00225   return false;
00226 }
00227 
00228 void SQVM::ToString(const SQObjectPtr &o,SQObjectPtr &res)
00229 {
00230   switch(type(o)) {
00231   case OT_STRING:
00232     res = o;
00233     return;
00234   case OT_FLOAT:
00235     scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%g"),_float(o));
00236     break;
00237   case OT_INTEGER:
00238 #if defined(_SQ64)
00239     scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%ld"),_integer(o));
00240 #else
00241     scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%d"),_integer(o));
00242 #endif
00243     break;
00244   case OT_BOOL:
00245     scsprintf(_sp(rsl(6)),_integer(o)?_SC("true"):_SC("false"));
00246     break;
00247   case OT_TABLE:
00248   case OT_USERDATA:
00249   case OT_INSTANCE:
00250     if(_delegable(o)->_delegate) {
00251       Push(o);
00252       if(CallMetaMethod(_delegable(o),MT_TOSTRING,1,res)) {
00253         if(type(res) == OT_STRING)
00254           return;
00255         //else keeps going to the default
00256       }
00257     }
00258   default:
00259     scsprintf(_sp(rsl(sizeof(void*)+20)),_SC("(%s : 0x%p)"),GetTypeName(o),(void*)_rawval(o));
00260   }
00261   res = SQString::Create(_ss(this),_spval);
00262 }
00263 
00264 
00265 bool SQVM::StringCat(const SQObjectPtr &str,const SQObjectPtr &obj,SQObjectPtr &dest)
00266 {
00267   SQObjectPtr a, b;
00268   ToString(str, a);
00269   ToString(obj, b);
00270   SQInteger l = _string(a)->_len , ol = _string(b)->_len;
00271   SQChar *s = _sp(rsl(l + ol + 1));
00272   memcpy(s, _stringval(a), rsl(l));
00273   memcpy(s + l, _stringval(b), rsl(ol));
00274   dest = SQString::Create(_ss(this), _spval, l + ol);
00275   return true;
00276 }
00277 
00278 void SQVM::TypeOf(const SQObjectPtr &obj1,SQObjectPtr &dest)
00279 {
00280   if(is_delegable(obj1) && _delegable(obj1)->_delegate) {
00281     Push(obj1);
00282     if(CallMetaMethod(_delegable(obj1),MT_TYPEOF,1,dest))
00283       return;
00284   }
00285   dest = SQString::Create(_ss(this),GetTypeName(obj1));
00286 }
00287 
00288 bool SQVM::Init(SQVM *friendvm, SQInteger stacksize)
00289 {
00290   _stack.resize(stacksize);
00291   //_callsstack.reserve(4);
00292   _alloccallsstacksize = 4;
00293   _callstackdata.resize(_alloccallsstacksize);
00294   _callsstacksize = 0;
00295   _callsstack = &_callstackdata[0];
00296   //_callsstack = (CallInfo*)sq_malloc(_alloccallsstacksize*sizeof(CallInfo));
00297   _stackbase = 0;
00298   _top = 0;
00299   if(!friendvm)
00300     _roottable = SQTable::Create(_ss(this), 0);
00301   else {
00302     _roottable = friendvm->_roottable;
00303     _errorhandler = friendvm->_errorhandler;
00304     _debughook = friendvm->_debughook;
00305   }
00306 
00307   sq_base_register(this);
00308   return true;
00309 }
00310 
00311 extern SQInstructionDesc g_InstrDesc[];
00312 
00313 bool SQVM::StartCall(SQClosure *closure,SQInteger target,SQInteger args,SQInteger stackbase,bool tailcall)
00314 {
00315   SQFunctionProto *func = _funcproto(closure->_function);
00316 
00317   const SQInteger paramssize = func->_nparameters;
00318   const SQInteger newtop = stackbase + func->_stacksize;
00319   SQInteger nargs = args;
00320   if (paramssize != nargs) {
00321     SQInteger ndef = func->_ndefaultparams;
00322     if(ndef && nargs < paramssize) {
00323       SQInteger diff = paramssize - nargs;
00324       for(SQInteger n = ndef - diff; n < ndef; n++) {
00325         _stack._vals[stackbase + (nargs++)] = closure->_defaultparams[n];
00326       }
00327     }
00328     else if(func->_varparams)
00329     {
00330       if (nargs < paramssize) {
00331         Raise_Error(_SC("wrong number of parameters"));
00332         return false;
00333       }
00334       for(SQInteger n = 0; n < nargs - paramssize; n++) {
00335         _vargsstack.push_back(_stack._vals[stackbase+paramssize+n]);
00336         _stack._vals[stackbase+paramssize+n] = _null_;
00337       }
00338     }
00339     else {
00340       Raise_Error(_SC("wrong number of parameters"));
00341       return false;
00342     }
00343   }
00344 
00345   if(type(closure->_env) == OT_WEAKREF) {
00346     _stack._vals[stackbase] = _weakref(closure->_env)->_obj;
00347   }
00348 
00349   if (!tailcall) {
00350     CallInfo lc;
00351     memset(&lc, 0, sizeof(lc));
00352     lc._generator = NULL;
00353     lc._etraps = 0;
00354     lc._prevstkbase = (SQInt32) ( stackbase - _stackbase );
00355     lc._target = (SQInt32) target;
00356     lc._prevtop = (SQInt32) (_top - _stackbase);
00357     lc._ncalls = 1;
00358     lc._root = SQFalse;
00359     PUSH_CALLINFO(this, lc);
00360   }
00361   else {
00362     ci->_ncalls++;
00363   }
00364   ci->_vargs.size = (SQInt32)(nargs - paramssize);
00365   ci->_vargs.base = (SQInt32)(_vargsstack.size()-(ci->_vargs.size));
00366   ci->_closure = closure;
00367   ci->_literals = func->_literals;
00368   ci->_ip = func->_instructions;
00369   //grows the stack if needed
00370   if (((SQUnsignedInteger)newtop + (func->_stacksize<<1)) > _stack.size()) {
00371     _stack.resize(_stack.size() + (func->_stacksize<<1));
00372   }
00373 
00374   _top = newtop;
00375   _stackbase = stackbase;
00376   if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
00377     CallDebugHook(_SC('c'));
00378   return true;
00379 }
00380 
00381 bool SQVM::Return(SQInteger _arg0, SQInteger _arg1, SQObjectPtr &retval)
00382 {
00383   if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
00384     for(SQInteger i=0;i<ci->_ncalls;i++)
00385       CallDebugHook(_SC('r'));
00386 
00387   SQBool broot = ci->_root;
00388   SQInteger last_top = _top;
00389   SQInteger target = ci->_target;
00390   SQInteger oldstackbase = _stackbase;
00391   _stackbase -= ci->_prevstkbase;
00392   _top = _stackbase + ci->_prevtop;
00393   if(ci->_vargs.size) PopVarArgs(ci->_vargs);
00394   POP_CALLINFO(this);
00395   if (broot) {
00396     if (_arg0 != MAX_FUNC_STACKSIZE) retval = _stack._vals[oldstackbase+_arg1];
00397     else retval = _null_;
00398   }
00399   else {
00400     if(target != -1) { //-1 is when a class contructor ret value has to be ignored
00401       if (_arg0 != MAX_FUNC_STACKSIZE)
00402         STK(target) = _stack._vals[oldstackbase+_arg1];
00403       else
00404         STK(target) = _null_;
00405     }
00406   }
00407 
00408   while (last_top > oldstackbase) _stack._vals[last_top--].Null();
00409   assert(oldstackbase >= _stackbase);
00410   return broot?true:false;
00411 }
00412 
00413 #define _RET_ON_FAIL(exp) { if(!exp) return false; }
00414 
00415 bool SQVM::LOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
00416 {
00417   _RET_ON_FAIL(ARITH_OP( op , target, a, incr));
00418   a = target;
00419   return true;
00420 }
00421 
00422 bool SQVM::PLOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
00423 {
00424   SQObjectPtr trg;
00425   _RET_ON_FAIL(ARITH_OP( op , trg, a, incr));
00426   target = a;
00427   a = trg;
00428   return true;
00429 }
00430 
00431 bool SQVM::DerefInc(SQInteger op,SQObjectPtr &target, SQObjectPtr &self, SQObjectPtr &key, SQObjectPtr &incr, bool postfix)
00432 {
00433   SQObjectPtr tmp, tself = self, tkey = key;
00434   if (!Get(tself, tkey, tmp, false, true)) { Raise_IdxError(tkey); return false; }
00435   _RET_ON_FAIL(ARITH_OP( op , target, tmp, incr))
00436   Set(tself, tkey, target,true);
00437   if (postfix) target = tmp;
00438   return true;
00439 }
00440 
00441 #define arg0 (_i_._arg0)
00442 #define arg1 (_i_._arg1)
00443 #define sarg1 (*((SQInt32 *)&_i_._arg1))
00444 #define arg2 (_i_._arg2)
00445 #define arg3 (_i_._arg3)
00446 #define sarg3 ((SQInteger)*((signed char *)&_i_._arg3))
00447 
00448 SQRESULT SQVM::Suspend()
00449 {
00450   if (_suspended)
00451     return sq_throwerror(this, _SC("cannot suspend an already suspended vm"));
00452   if (_nnativecalls!=2)
00453     return sq_throwerror(this, _SC("cannot suspend through native calls/metamethods"));
00454   return SQ_SUSPEND_FLAG;
00455 }
00456 
00457 void SQVM::PopVarArgs(VarArgs &vargs)
00458 {
00459   for(SQInteger n = 0; n< vargs.size; n++)
00460     _vargsstack.pop_back();
00461 }
00462 
00463 #define _FINISH(howmuchtojump) {jump = howmuchtojump; return true; }
00464 bool SQVM::FOREACH_OP(SQObjectPtr &o1,SQObjectPtr &o2,SQObjectPtr
00465 &o3,SQObjectPtr &o4,SQInteger arg_2,int exitpos,int &jump)
00466 {
00467   SQInteger nrefidx;
00468   switch(type(o1)) {
00469   case OT_TABLE:
00470     if((nrefidx = _table(o1)->Next(false,o4, o2, o3)) == -1) _FINISH(exitpos);
00471     o4 = (SQInteger)nrefidx; _FINISH(1);
00472   case OT_ARRAY:
00473     if((nrefidx = _array(o1)->Next(o4, o2, o3)) == -1) _FINISH(exitpos);
00474     o4 = (SQInteger) nrefidx; _FINISH(1);
00475   case OT_STRING:
00476     if((nrefidx = _string(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
00477     o4 = (SQInteger)nrefidx; _FINISH(1);
00478   case OT_CLASS:
00479     if((nrefidx = _class(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
00480     o4 = (SQInteger)nrefidx; _FINISH(1);
00481   case OT_USERDATA:
00482   case OT_INSTANCE:
00483     if(_delegable(o1)->_delegate) {
00484       SQObjectPtr itr;
00485       Push(o1);
00486       Push(o4);
00487       if(CallMetaMethod(_delegable(o1), MT_NEXTI, 2, itr)){
00488         o4 = o2 = itr;
00489         if(type(itr) == OT_NULL) _FINISH(exitpos);
00490         if(!Get(o1, itr, o3, false,false)) {
00491           Raise_Error(_SC("_nexti returned an invalid idx"));
00492           return false;
00493         }
00494         _FINISH(1);
00495       }
00496       Raise_Error(_SC("_nexti failed"));
00497       return false;
00498     }
00499     break;
00500   case OT_GENERATOR:
00501     if(_generator(o1)->_state == SQGenerator::eDead) _FINISH(exitpos);
00502     if(_generator(o1)->_state == SQGenerator::eSuspended) {
00503       SQInteger idx = 0;
00504       if(type(o4) == OT_INTEGER) {
00505         idx = _integer(o4) + 1;
00506       }
00507       o2 = idx;
00508       o4 = idx;
00509       _generator(o1)->Resume(this, arg_2+1);
00510       _FINISH(0);
00511     }
00512   default:
00513     Raise_Error(_SC("cannot iterate %s"), GetTypeName(o1));
00514   }
00515   return false; //cannot be hit(just to avoid warnings)
00516 }
00517 
00518 bool SQVM::DELEGATE_OP(SQObjectPtr &trg,SQObjectPtr &o1,SQObjectPtr &o2)
00519 {
00520   if(type(o1) != OT_TABLE) { Raise_Error(_SC("delegating a '%s'"), GetTypeName(o1)); return false; }
00521   switch(type(o2)) {
00522   case OT_TABLE:
00523     if(!_table(o1)->SetDelegate(_table(o2))){
00524       Raise_Error(_SC("delegate cycle detected"));
00525       return false;
00526     }
00527     break;
00528   case OT_NULL:
00529     _table(o1)->SetDelegate(NULL);
00530     break;
00531   default:
00532     Raise_Error(_SC("using '%s' as delegate"), GetTypeName(o2));
00533     return false;
00534     break;
00535   }
00536   trg = o1;
00537   return true;
00538 }
00539 #define COND_LITERAL (arg3!=0?ci->_literals[arg1]:STK(arg1))
00540 
00541 #define _GUARD(exp) { if(!exp) { Raise_Error(_lasterror); SQ_THROW();} }
00542 
00543 #define SQ_THROW() { goto exception_trap; }
00544 
00545 bool SQVM::CLOSURE_OP(SQObjectPtr &target, SQFunctionProto *func)
00546 {
00547   SQInteger nouters;
00548   SQClosure *closure = SQClosure::Create(_ss(this), func);
00549   if((nouters = func->_noutervalues)) {
00550     closure->_outervalues.reserve(nouters);
00551     for(SQInteger i = 0; i<nouters; i++) {
00552       SQOuterVar &v = func->_outervalues[i];
00553       switch(v._type){
00554       case otSYMBOL:
00555         closure->_outervalues.push_back(_null_);
00556         if(!Get(_stack._vals[_stackbase]/*STK(0)*/, v._src, closure->_outervalues.top(), false,true))
00557         {Raise_IdxError(v._src); return false; }
00558         break;
00559       case otLOCAL:
00560         closure->_outervalues.push_back(_stack._vals[_stackbase+_integer(v._src)]);
00561         break;
00562       case otOUTER:
00563         closure->_outervalues.push_back(_closure(ci->_closure)->_outervalues[_integer(v._src)]);
00564         break;
00565       }
00566     }
00567   }
00568   SQInteger ndefparams;
00569   if((ndefparams = func->_ndefaultparams)) {
00570     closure->_defaultparams.reserve(ndefparams);
00571     for(SQInteger i = 0; i < ndefparams; i++) {
00572       SQInteger spos = func->_defaultparams[i];
00573       closure->_defaultparams.push_back(_stack._vals[_stackbase + spos]);
00574     }
00575   }
00576   target = closure;
00577   return true;
00578 
00579 }
00580 
00581 bool SQVM::GETVARGV_OP(SQObjectPtr &target,SQObjectPtr &index,CallInfo *ci)
00582 {
00583   if(ci->_vargs.size == 0) {
00584     Raise_Error(_SC("the function doesn't have var args"));
00585     return false;
00586   }
00587   if(!sq_isnumeric(index)){
00588     Raise_Error(_SC("indexing 'vargv' with %s"),GetTypeName(index));
00589     return false;
00590   }
00591   SQInteger idx = tointeger(index);
00592   if(idx < 0 || idx >= ci->_vargs.size){ Raise_Error(_SC("vargv index out of range")); return false; }
00593   target = _vargsstack[ci->_vargs.base+idx];
00594   return true;
00595 }
00596 
00597 bool SQVM::CLASS_OP(SQObjectPtr &target,SQInteger baseclass,SQInteger attributes)
00598 {
00599   SQClass *base = NULL;
00600   SQObjectPtr attrs;
00601   if(baseclass != -1) {
00602     if(type(_stack._vals[_stackbase+baseclass]) != OT_CLASS) { Raise_Error(_SC("trying to inherit from a %s"),GetTypeName(_stack._vals[_stackbase+baseclass])); return false; }
00603     base = _class(_stack._vals[_stackbase + baseclass]);
00604   }
00605   if(attributes != MAX_FUNC_STACKSIZE) {
00606     attrs = _stack._vals[_stackbase+attributes];
00607   }
00608   target = SQClass::Create(_ss(this),base);
00609   if(type(_class(target)->_metamethods[MT_INHERITED]) != OT_NULL) {
00610     int nparams = 2;
00611     SQObjectPtr ret;
00612     Push(target); Push(attrs);
00613     Call(_class(target)->_metamethods[MT_INHERITED],nparams,_top - nparams, ret, false, false);
00614     Pop(nparams);
00615   }
00616   _class(target)->_attributes = attrs;
00617   return true;
00618 }
00619 
00620 
00621 
00622 bool SQVM::IsEqual(SQObjectPtr &o1,SQObjectPtr &o2,bool &res)
00623 {
00624   if(type(o1) == type(o2)) {
00625     res = ((_userpointer(o1) == _userpointer(o2)?true:false));
00626   }
00627   else {
00628     if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
00629       SQInteger cmpres;
00630       if(!ObjCmp(o1, o2,cmpres)) return false;
00631       res = (cmpres == 0);
00632     }
00633     else {
00634       res = false;
00635     }
00636   }
00637   return true;
00638 }
00639 
00640 bool SQVM::IsFalse(SQObjectPtr &o)
00641 {
00642   if(((type(o) & SQOBJECT_CANBEFALSE) && ( (type(o) == OT_FLOAT) && (_float(o) == SQFloat(0.0)) ))
00643     || (_integer(o) == 0) ) { //OT_NULL|OT_INTEGER|OT_BOOL
00644     return true;
00645   }
00646   return false;
00647 }
00648 
00649 bool SQVM::GETPARENT_OP(SQObjectPtr &o,SQObjectPtr &target)
00650 {
00651   switch(type(o)) {
00652     case OT_TABLE: target = _table(o)->_delegate?SQObjectPtr(_table(o)->_delegate):_null_;
00653       break;
00654     case OT_CLASS: target = _class(o)->_base?_class(o)->_base:_null_;
00655       break;
00656     default:
00657       Raise_Error(_SC("the %s type doesn't have a parent slot"), GetTypeName(o));
00658       return false;
00659   }
00660   return true;
00661 }
00662 
00663 bool SQVM::Execute(SQObjectPtr &closure, SQInteger target, SQInteger nargs, SQInteger stackbase,SQObjectPtr &outres, SQBool raiseerror,ExecutionType et)
00664 {
00665   if ((_nnativecalls + 1) > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
00666   _nnativecalls++;
00667   AutoDec ad(&_nnativecalls);
00668   SQInteger traps = 0;
00669   //temp_reg vars for OP_CALL
00670   SQInteger ct_target;
00671   SQInteger ct_stackbase;
00672   bool ct_tailcall;
00673 
00674   switch(et) {
00675     case ET_CALL:
00676       if(!StartCall(_closure(closure), _top - nargs, nargs, stackbase, false)) {
00677         //call the handler if there are no calls in the stack, if not relies on the previous node
00678         if(ci == NULL) CallErrorHandler(_lasterror);
00679         return false;
00680       }
00681       ci->_root = SQTrue;
00682       break;
00683     case ET_RESUME_GENERATOR: _generator(closure)->Resume(this, target); ci->_root = SQTrue; traps += ci->_etraps; break;
00684     case ET_RESUME_VM:
00685       traps = _suspended_traps;
00686       ci->_root = _suspended_root;
00687       ci->_vargs = _suspend_varargs;
00688       _suspended = SQFalse;
00689       break;
00690     case ET_RESUME_OPENTTD:
00691       traps = _suspended_traps;
00692       _suspended = SQFalse;
00693       break;
00694   }
00695 
00696 exception_restore:
00697   //
00698   {
00699     for(;;)
00700     {
00701       DecreaseOps(1);
00702       if (ShouldSuspend()) { _suspended = SQTrue; _suspended_traps = traps; return true; }
00703 
00704       const SQInstruction &_i_ = *ci->_ip++;
00705       //dumpstack(_stackbase);
00706       //scprintf("%s %d %d %d %d\n",g_InstrDesc[_i_.op].name,arg0,arg1,arg2,arg3);
00707       switch(_i_.op)
00708       {
00709       case _OP_LINE:
00710         if(type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
00711           CallDebugHook(_SC('l'),arg1);
00712         continue;
00713       case _OP_LOAD: TARGET = ci->_literals[arg1]; continue;
00714       case _OP_LOADINT: TARGET = (SQInteger)arg1; continue;
00715       case _OP_LOADFLOAT: TARGET = *((SQFloat *)&arg1); continue;
00716       case _OP_DLOAD: TARGET = ci->_literals[arg1]; STK(arg2) = ci->_literals[arg3];continue;
00717       case _OP_TAILCALL:
00718         temp_reg = STK(arg1);
00719         if (type(temp_reg) == OT_CLOSURE){
00720           ct_tailcall = true;
00721           if(ci->_vargs.size) PopVarArgs(ci->_vargs);
00722           for (SQInteger i = 0; i < arg3; i++) STK(i) = STK(arg2 + i);
00723           ct_target = ci->_target;
00724           ct_stackbase = _stackbase;
00725           goto common_call;
00726         }
00727       case _OP_CALL: {
00728           ct_tailcall = false;
00729           ct_target = arg0;
00730           temp_reg = STK(arg1);
00731           ct_stackbase = _stackbase+arg2;
00732 
00733 common_call:
00734           SQObjectPtr clo = temp_reg;
00735           SQInteger last_top = _top;
00736           switch (type(clo)) {
00737           case OT_CLOSURE:{
00738             _GUARD(StartCall(_closure(clo), ct_target, arg3, ct_stackbase, ct_tailcall));
00739             if (_funcproto(_closure(clo)->_function)->_bgenerator) {
00740               SQGenerator *gen = SQGenerator::Create(_ss(this), _closure(clo));
00741               _GUARD(gen->Yield(this));
00742               Return(1, ct_target, clo);
00743               STK(ct_target) = gen;
00744               while (last_top >= _top) _stack._vals[last_top--].Null();
00745               continue;
00746             }
00747             }
00748             continue;
00749           case OT_NATIVECLOSURE: {
00750             bool suspend;
00751             _suspended_target = ct_target;
00752             _GUARD(CallNative(_nativeclosure(clo), arg3, ct_stackbase, clo,suspend));
00753             if(suspend){
00754               _suspended = SQTrue;
00755               _suspended_target = ct_target;
00756               _suspended_root = ci->_root;
00757               _suspended_traps = traps;
00758               _suspend_varargs = ci->_vargs;
00759               outres = clo;
00760               return true;
00761             }
00762             if(ct_target != -1) { //skip return value for constructors
00763               STK(ct_target) = clo;
00764             }
00765                        }
00766             continue;
00767           case OT_CLASS:{
00768             SQObjectPtr inst;
00769             _GUARD(CreateClassInstance(_class(clo),inst,temp_reg));
00770             STK(ct_target) = inst;
00771             ct_target = -1; //fakes return value target so that is not overwritten by the constructor
00772             if(type(temp_reg) != OT_NULL) {
00773               _stack._vals[ct_stackbase] = inst;
00774               goto common_call; //hard core spaghetti code(reissues the OP_CALL to invoke the constructor)
00775             }
00776             }
00777             break;
00778           case OT_TABLE:
00779           case OT_USERDATA:
00780           case OT_INSTANCE:
00781             {
00782             Push(clo);
00783             for (SQInteger i = 0; i < arg3; i++) Push(STK(arg2 + i));
00784             if (_delegable(clo) && CallMetaMethod(_delegable(clo), MT_CALL, arg3+1, clo)){
00785               STK(ct_target) = clo;
00786               break;
00787             }
00788             Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
00789             SQ_THROW();
00790             }
00791           default:
00792             Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
00793             SQ_THROW();
00794           }
00795         }
00796           continue;
00797       case _OP_PREPCALL:
00798       case _OP_PREPCALLK:
00799         {
00800           SQObjectPtr &key = _i_.op == _OP_PREPCALLK?(ci->_literals)[arg1]:STK(arg1);
00801           SQObjectPtr &o = STK(arg2);
00802           if (!Get(o, key, temp_reg,false,true)) {
00803             if(type(o) == OT_CLASS) { //hack?
00804               if(_class_ddel->Get(key,temp_reg)) {
00805                 STK(arg3) = o;
00806                 TARGET = temp_reg;
00807                 continue;
00808               }
00809             }
00810             { Raise_IdxError(key); SQ_THROW();}
00811           }
00812 
00813           STK(arg3) = type(o) == OT_CLASS?STK(0):o;
00814           TARGET = temp_reg;
00815         }
00816         continue;
00817       case _OP_SCOPE_END:
00818       {
00819         SQInteger from = arg0;
00820         SQInteger count = arg1 - arg0 + 2;
00821         /* When 'return' is executed, it happens that the stack is already cleaned
00822          *  (by Return()), but this OP-code is still executed. So check for this
00823          *  situation, and ignore the cleanup */
00824         if (_stackbase + count + from <= _top) {
00825           while (--count >= 0) _stack._vals[_stackbase + count + from].Null();
00826         }
00827       } continue;
00828       case _OP_GETK:
00829         if (!Get(STK(arg2), ci->_literals[arg1], temp_reg, false,true)) { Raise_IdxError(ci->_literals[arg1]); SQ_THROW();}
00830         TARGET = temp_reg;
00831         continue;
00832       case _OP_MOVE: TARGET = STK(arg1); continue;
00833       case _OP_NEWSLOT:
00834         _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),false));
00835         if(arg0 != arg3) TARGET = STK(arg3);
00836         continue;
00837       case _OP_DELETE: _GUARD(DeleteSlot(STK(arg1), STK(arg2), TARGET)); continue;
00838       case _OP_SET:
00839         if (!Set(STK(arg1), STK(arg2), STK(arg3),true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
00840         if (arg0 != arg3) TARGET = STK(arg3);
00841         continue;
00842       case _OP_GET:
00843         if (!Get(STK(arg1), STK(arg2), temp_reg, false,true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
00844         TARGET = temp_reg;
00845         continue;
00846       case _OP_EQ:{
00847         bool res;
00848         if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
00849         TARGET = res?_true_:_false_;
00850         }continue;
00851       case _OP_NE:{
00852         bool res;
00853         if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
00854         TARGET = (!res)?_true_:_false_;
00855         } continue;
00856       case _OP_ARITH: _GUARD(ARITH_OP( arg3 , temp_reg, STK(arg2), STK(arg1))); TARGET = temp_reg; continue;
00857       case _OP_BITW:  _GUARD(BW_OP( arg3,TARGET,STK(arg2),STK(arg1))); continue;
00858       case _OP_RETURN:
00859         if(ci->_generator) {
00860           ci->_generator->Kill();
00861         }
00862         if(Return(arg0, arg1, temp_reg)){
00863           assert(traps==0);
00864           outres = temp_reg;
00865           return true;
00866         }
00867         continue;
00868       case _OP_LOADNULLS:{ for(SQInt32 n=0; n < arg1; n++) STK(arg0+n) = _null_; }continue;
00869       case _OP_LOADROOTTABLE: TARGET = _roottable; continue;
00870       case _OP_LOADBOOL: TARGET = arg1?_true_:_false_; continue;
00871       case _OP_DMOVE: STK(arg0) = STK(arg1); STK(arg2) = STK(arg3); continue;
00872       case _OP_JMP: ci->_ip += (sarg1); continue;
00873       case _OP_JNZ: if(!IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
00874       case _OP_JZ: if(IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
00875       case _OP_LOADFREEVAR: TARGET = _closure(ci->_closure)->_outervalues[arg1]; continue;
00876       case _OP_VARGC: TARGET = SQInteger(ci->_vargs.size); continue;
00877       case _OP_GETVARGV:
00878         if(!GETVARGV_OP(TARGET,STK(arg1),ci)) { SQ_THROW(); }
00879         continue;
00880       case _OP_NEWTABLE: TARGET = SQTable::Create(_ss(this), arg1); continue;
00881       case _OP_NEWARRAY: TARGET = SQArray::Create(_ss(this), 0); _array(TARGET)->Reserve(arg1); continue;
00882       case _OP_APPENDARRAY: _array(STK(arg0))->Append(COND_LITERAL);  continue;
00883       case _OP_GETPARENT: _GUARD(GETPARENT_OP(STK(arg1),TARGET)); continue;
00884       case _OP_COMPARITH: _GUARD(DerefInc(arg3, TARGET, STK((((SQUnsignedInteger)arg1&0xFFFF0000)>>16)), STK(arg2), STK(arg1&0x0000FFFF), false)); continue;
00885       case _OP_COMPARITHL: _GUARD(LOCAL_INC(arg3, TARGET, STK(arg1), STK(arg2))); continue;
00886       case _OP_INC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, false));} continue;
00887       case _OP_INCL: {SQObjectPtr o(sarg3); _GUARD(LOCAL_INC('+',TARGET, STK(arg1), o));} continue;
00888       case _OP_PINC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, true));} continue;
00889       case _OP_PINCL: {SQObjectPtr o(sarg3); _GUARD(PLOCAL_INC('+',TARGET, STK(arg1), o));} continue;
00890       case _OP_CMP: _GUARD(CMP_OP((CmpOP)arg3,STK(arg2),STK(arg1),TARGET))  continue;
00891       case _OP_EXISTS: TARGET = Get(STK(arg1), STK(arg2), temp_reg, true,false)?_true_:_false_;continue;
00892       case _OP_INSTANCEOF:
00893         if(type(STK(arg1)) != OT_CLASS || type(STK(arg2)) != OT_INSTANCE)
00894         {Raise_Error(_SC("cannot apply instanceof between a %s and a %s"),GetTypeName(STK(arg1)),GetTypeName(STK(arg2))); SQ_THROW();}
00895         TARGET = _instance(STK(arg2))->InstanceOf(_class(STK(arg1)))?_true_:_false_;
00896         continue;
00897       case _OP_AND:
00898         if(IsFalse(STK(arg2))) {
00899           TARGET = STK(arg2);
00900           ci->_ip += (sarg1);
00901         }
00902         continue;
00903       case _OP_OR:
00904         if(!IsFalse(STK(arg2))) {
00905           TARGET = STK(arg2);
00906           ci->_ip += (sarg1);
00907         }
00908         continue;
00909       case _OP_NEG: _GUARD(NEG_OP(TARGET,STK(arg1))); continue;
00910       case _OP_NOT: TARGET = (IsFalse(STK(arg1))?_true_:_false_); continue;
00911       case _OP_BWNOT:
00912         if(type(STK(arg1)) == OT_INTEGER) {
00913           SQInteger t = _integer(STK(arg1));
00914           TARGET = SQInteger(~t);
00915           continue;
00916         }
00917         Raise_Error(_SC("attempt to perform a bitwise op on a %s"), GetTypeName(STK(arg1)));
00918         SQ_THROW();
00919       case _OP_CLOSURE: {
00920         SQClosure *c = ci->_closure._unVal.pClosure;
00921         SQFunctionProto *fp = c->_function._unVal.pFunctionProto;
00922         if(!CLOSURE_OP(TARGET,fp->_functions[arg1]._unVal.pFunctionProto)) { SQ_THROW(); }
00923         continue;
00924       }
00925       case _OP_YIELD:{
00926         if(ci->_generator) {
00927           if(sarg1 != MAX_FUNC_STACKSIZE) temp_reg = STK(arg1);
00928           _GUARD(ci->_generator->Yield(this));
00929           traps -= ci->_etraps;
00930           if(sarg1 != MAX_FUNC_STACKSIZE) STK(arg1) = temp_reg;
00931         }
00932         else { Raise_Error(_SC("trying to yield a '%s',only genenerator can be yielded"), GetTypeName(ci->_generator)); SQ_THROW();}
00933         if(Return(arg0, arg1, temp_reg)){
00934           assert(traps == 0);
00935           outres = temp_reg;
00936           return true;
00937         }
00938 
00939         }
00940         continue;
00941       case _OP_RESUME:
00942         if(type(STK(arg1)) != OT_GENERATOR){ Raise_Error(_SC("trying to resume a '%s',only genenerator can be resumed"), GetTypeName(STK(arg1))); SQ_THROW();}
00943         _GUARD(_generator(STK(arg1))->Resume(this, arg0));
00944         traps += ci->_etraps;
00945                 continue;
00946       case _OP_FOREACH:{ int tojump;
00947         _GUARD(FOREACH_OP(STK(arg0),STK(arg2),STK(arg2+1),STK(arg2+2),arg2,sarg1,tojump));
00948         ci->_ip += tojump; }
00949         continue;
00950       case _OP_POSTFOREACH:
00951         assert(type(STK(arg0)) == OT_GENERATOR);
00952         if(_generator(STK(arg0))->_state == SQGenerator::eDead)
00953           ci->_ip += (sarg1 - 1);
00954         continue;
00955       case _OP_DELEGATE: _GUARD(DELEGATE_OP(TARGET,STK(arg1),STK(arg2))); continue;
00956       case _OP_CLONE:
00957         if(!Clone(STK(arg1), TARGET))
00958         { Raise_Error(_SC("cloning a %s"), GetTypeName(STK(arg1))); SQ_THROW();}
00959         continue;
00960       case _OP_TYPEOF: TypeOf(STK(arg1), TARGET); continue;
00961       case _OP_PUSHTRAP:{
00962         SQInstruction *_iv = _funcproto(_closure(ci->_closure)->_function)->_instructions;
00963         _etraps.push_back(SQExceptionTrap(_top,_stackbase, &_iv[(ci->_ip-_iv)+arg1], arg0)); traps++;
00964         ci->_etraps++;
00965                 }
00966         continue;
00967       case _OP_POPTRAP: {
00968         for(SQInteger i = 0; i < arg0; i++) {
00969           _etraps.pop_back(); traps--;
00970           ci->_etraps--;
00971         }
00972                 }
00973         continue;
00974       case _OP_THROW: Raise_Error(TARGET); SQ_THROW(); continue;
00975       case _OP_CLASS: _GUARD(CLASS_OP(TARGET,arg1,arg2)); continue;
00976       case _OP_NEWSLOTA:
00977         bool bstatic = (arg0&NEW_SLOT_STATIC_FLAG)?true:false;
00978         if(type(STK(arg1)) == OT_CLASS) {
00979           if(type(_class(STK(arg1))->_metamethods[MT_NEWMEMBER]) != OT_NULL ) {
00980             Push(STK(arg1)); Push(STK(arg2)); Push(STK(arg3));
00981             Push((arg0&NEW_SLOT_ATTRIBUTES_FLAG) ? STK(arg2-1) : _null_);
00982             int nparams = 4;
00983             if(Call(_class(STK(arg1))->_metamethods[MT_NEWMEMBER], nparams, _top - nparams, temp_reg,SQFalse,SQFalse)) {
00984               Pop(nparams);
00985               continue;
00986             }
00987           }
00988         }
00989         _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),bstatic));
00990         if((arg0&NEW_SLOT_ATTRIBUTES_FLAG)) {
00991           _class(STK(arg1))->SetAttributes(STK(arg2),STK(arg2-1));
00992         }
00993         continue;
00994       }
00995 
00996     }
00997   }
00998 exception_trap:
00999   {
01000     SQObjectPtr currerror = _lasterror;
01001 //    dumpstack(_stackbase);
01002     SQInteger n = 0;
01003     SQInteger last_top = _top;
01004     if(ci) {
01005       if(_ss(this)->_notifyallexceptions) CallErrorHandler(currerror);
01006 
01007       if(traps) {
01008         do {
01009           if(ci->_etraps > 0) {
01010             SQExceptionTrap &et = _etraps.top();
01011             ci->_ip = et._ip;
01012             _top = et._stacksize;
01013             _stackbase = et._stackbase;
01014             _stack._vals[_stackbase+et._extarget] = currerror;
01015             _etraps.pop_back(); traps--; ci->_etraps--;
01016             while(last_top >= _top) _stack._vals[last_top--].Null();
01017             goto exception_restore;
01018           }
01019           //if is a native closure
01020           if(type(ci->_closure) != OT_CLOSURE && n)
01021             break;
01022           if(ci->_generator) ci->_generator->Kill();
01023           PopVarArgs(ci->_vargs);
01024           POP_CALLINFO(this);
01025           n++;
01026         } while(_callsstacksize);
01027       }
01028       else {
01029         //call the hook
01030         if(raiseerror && !_ss(this)->_notifyallexceptions)
01031           CallErrorHandler(currerror);
01032       }
01033       //remove call stack until a C function is found or the cstack is empty
01034       if(ci) do {
01035         SQBool exitafterthisone = ci->_root;
01036         if(ci->_generator) ci->_generator->Kill();
01037         _stackbase -= ci->_prevstkbase;
01038         _top = _stackbase + ci->_prevtop;
01039         PopVarArgs(ci->_vargs);
01040         POP_CALLINFO(this);
01041         if( (ci && type(ci->_closure) != OT_CLOSURE) || exitafterthisone) break;
01042       } while(_callsstacksize);
01043 
01044       while(last_top >= _top) _stack._vals[last_top--].Null();
01045     }
01046     _lasterror = currerror;
01047     return false;
01048   }
01049   assert(0);
01050 }
01051 
01052 bool SQVM::CreateClassInstance(SQClass *theclass, SQObjectPtr &inst, SQObjectPtr &constructor)
01053 {
01054   inst = theclass->CreateInstance();
01055   if(!theclass->Get(_ss(this)->_constructoridx,constructor)) {
01056     //if(!Call(constr,nargs,stackbase,constr,false))
01057     //  return false;
01058     constructor = _null_;
01059   }
01060   return true;
01061 }
01062 
01063 void SQVM::CallErrorHandler(SQObjectPtr &error)
01064 {
01065   if(type(_errorhandler) != OT_NULL) {
01066     SQObjectPtr out;
01067     Push(_roottable); Push(error);
01068     Call(_errorhandler, 2, _top-2, out,SQFalse,SQFalse);
01069     Pop(2);
01070   }
01071 }
01072 
01073 void SQVM::CallDebugHook(SQInteger type,SQInteger forcedline)
01074 {
01075   SQObjectPtr temp_reg;
01076   SQInteger nparams=5;
01077   SQFunctionProto *func=_funcproto(_closure(ci->_closure)->_function);
01078   Push(_roottable); Push(type); Push(func->_sourcename); Push(forcedline?forcedline:func->GetLine(ci->_ip)); Push(func->_name);
01079   Call(_debughook,nparams,_top-nparams,temp_reg,SQFalse,SQFalse);
01080   Pop(nparams);
01081 }
01082 
01083 bool SQVM::CallNative(SQNativeClosure *nclosure,SQInteger nargs,SQInteger stackbase,SQObjectPtr &retval,bool &suspend)
01084 {
01085   if (_nnativecalls + 1 > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
01086   SQInteger nparamscheck = nclosure->_nparamscheck;
01087   if(((nparamscheck > 0) && (nparamscheck != nargs))
01088     || ((nparamscheck < 0) && (nargs < (-nparamscheck)))) {
01089     Raise_Error(_SC("wrong number of parameters"));
01090     return false;
01091     }
01092 
01093   SQInteger tcs;
01094   if((tcs = nclosure->_typecheck.size())) {
01095     for(SQInteger i = 0; i < nargs && i < tcs; i++)
01096       if((nclosure->_typecheck._vals[i] != -1) && !(type(_stack._vals[stackbase+i]) & nclosure->_typecheck[i])) {
01097                 Raise_ParamTypeError(i,nclosure->_typecheck._vals[i],type(_stack._vals[stackbase+i]));
01098         return false;
01099       }
01100   }
01101   _nnativecalls++;
01102   if ((_top + MIN_STACK_OVERHEAD) > (SQInteger)_stack.size()) {
01103     _stack.resize(_stack.size() + (MIN_STACK_OVERHEAD<<1));
01104   }
01105   SQInteger oldtop = _top;
01106   SQInteger oldstackbase = _stackbase;
01107   _top = stackbase + nargs;
01108   CallInfo lci;
01109   memset(&lci, 0, sizeof(lci));
01110   lci._closure = nclosure;
01111   lci._generator = NULL;
01112   lci._etraps = 0;
01113   lci._prevstkbase = (SQInt32) (stackbase - _stackbase);
01114   lci._ncalls = 1;
01115   lci._prevtop = (SQInt32) (oldtop - oldstackbase);
01116   PUSH_CALLINFO(this, lci);
01117   _stackbase = stackbase;
01118   //push free variables
01119   SQInteger outers = nclosure->_outervalues.size();
01120   for (SQInteger i = 0; i < outers; i++) {
01121     Push(nclosure->_outervalues[i]);
01122   }
01123 
01124   if(type(nclosure->_env) == OT_WEAKREF) {
01125     _stack[stackbase] = _weakref(nclosure->_env)->_obj;
01126   }
01127 
01128 
01129   SQInteger ret;
01130   try {
01131     SQBool can_suspend = this->_can_suspend;
01132     this->_can_suspend = false;
01133     ret = (nclosure->_function)(this);
01134     this->_can_suspend = can_suspend;
01135   } catch (...) {
01136     _nnativecalls--;
01137     suspend = false;
01138 
01139     _stackbase = oldstackbase;
01140     _top = oldtop;
01141 
01142     POP_CALLINFO(this);
01143 
01144     while(oldtop > _stackbase + stackbase) _stack._vals[oldtop--].Null();
01145     throw;
01146   }
01147 
01148   _nnativecalls--;
01149   suspend = false;
01150   if( ret == SQ_SUSPEND_FLAG) suspend = true;
01151   else if (ret < 0) {
01152     _stackbase = oldstackbase;
01153     _top = oldtop;
01154     POP_CALLINFO(this);
01155     while(oldtop > _stackbase + stackbase) _stack._vals[oldtop--].Null();
01156     Raise_Error(_lasterror);
01157     return false;
01158   }
01159 
01160   if (ret != 0){ retval = TOP(); TOP().Null(); }
01161   else { retval = _null_; }
01162   _stackbase = oldstackbase;
01163   _top = oldtop;
01164   POP_CALLINFO(this);
01165   while(oldtop > _stackbase + stackbase) _stack._vals[oldtop--].Null();
01166   return true;
01167 }
01168 
01169 bool SQVM::Get(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw, bool fetchroot)
01170 {
01171   switch(type(self)){
01172   case OT_TABLE:
01173     if(_table(self)->Get(key,dest))return true;
01174     break;
01175   case OT_ARRAY:
01176     if(sq_isnumeric(key)){
01177       return _array(self)->Get(tointeger(key),dest);
01178     }
01179     break;
01180   case OT_INSTANCE:
01181     if(_instance(self)->Get(key,dest)) return true;
01182     break;
01183   default:break; //shut up compiler
01184   }
01185   if(FallBackGet(self,key,dest,raw)) return true;
01186 
01187   if(fetchroot) {
01188     if(_rawval(STK(0)) == _rawval(self) &&
01189       type(STK(0)) == type(self)) {
01190         return _table(_roottable)->Get(key,dest);
01191     }
01192   }
01193   return false;
01194 }
01195 
01196 bool SQVM::FallBackGet(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw)
01197 {
01198   switch(type(self)){
01199   case OT_CLASS:
01200     return _class(self)->Get(key,dest);
01201     break;
01202   case OT_TABLE:
01203   case OT_USERDATA:
01204         //delegation
01205     if(_delegable(self)->_delegate) {
01206       if(Get(SQObjectPtr(_delegable(self)->_delegate),key,dest,raw,false))
01207         return true;
01208       if(raw)return false;
01209       Push(self);Push(key);
01210       if(CallMetaMethod(_delegable(self),MT_GET,2,dest))
01211         return true;
01212     }
01213     if(type(self) == OT_TABLE) {
01214       if(raw) return false;
01215       return _table_ddel->Get(key,dest);
01216     }
01217     return false;
01218     break;
01219   case OT_ARRAY:
01220     if(raw)return false;
01221     return _array_ddel->Get(key,dest);
01222   case OT_STRING:
01223     if(sq_isnumeric(key)){
01224       SQInteger n=tointeger(key);
01225       if(abs((int)n)<_string(self)->_len){
01226         if(n<0)n=_string(self)->_len-n;
01227         dest=SQInteger(_stringval(self)[n]);
01228         return true;
01229       }
01230       return false;
01231     }
01232     else {
01233       if(raw)return false;
01234       return _string_ddel->Get(key,dest);
01235     }
01236     break;
01237   case OT_INSTANCE:
01238     if(raw)return false;
01239     Push(self);Push(key);
01240     if(!CallMetaMethod(_delegable(self),MT_GET,2,dest)) {
01241       return _instance_ddel->Get(key,dest);
01242     }
01243     return true;
01244   case OT_INTEGER:case OT_FLOAT:case OT_BOOL:
01245     if(raw)return false;
01246     return _number_ddel->Get(key,dest);
01247   case OT_GENERATOR:
01248     if(raw)return false;
01249     return _generator_ddel->Get(key,dest);
01250   case OT_CLOSURE: case OT_NATIVECLOSURE:
01251     if(raw)return false;
01252     return _closure_ddel->Get(key,dest);
01253   case OT_THREAD:
01254     if(raw)return false;
01255     return  _thread_ddel->Get(key,dest);
01256   case OT_WEAKREF:
01257     if(raw)return false;
01258     return  _weakref_ddel->Get(key,dest);
01259   default:return false;
01260   }
01261   return false;
01262 }
01263 
01264 bool SQVM::Set(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool fetchroot)
01265 {
01266   switch(type(self)){
01267   case OT_TABLE:
01268     if(_table(self)->Set(key,val))
01269       return true;
01270     if(_table(self)->_delegate) {
01271       if(Set(_table(self)->_delegate,key,val,false)) {
01272         return true;
01273       }
01274     }
01275     //keeps going
01276   case OT_USERDATA:
01277     if(_delegable(self)->_delegate) {
01278       SQObjectPtr t;
01279       Push(self);Push(key);Push(val);
01280       if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
01281     }
01282     break;
01283   case OT_INSTANCE:{
01284     if(_instance(self)->Set(key,val))
01285       return true;
01286     SQObjectPtr t;
01287     Push(self);Push(key);Push(val);
01288     if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
01289     }
01290     break;
01291   case OT_ARRAY:
01292     if(!sq_isnumeric(key)) {Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key)); return false; }
01293     return _array(self)->Set(tointeger(key),val);
01294   default:
01295     Raise_Error(_SC("trying to set '%s'"),GetTypeName(self));
01296     return false;
01297   }
01298   if(fetchroot) {
01299     if(_rawval(STK(0)) == _rawval(self) &&
01300       type(STK(0)) == type(self)) {
01301         return _table(_roottable)->Set(key,val);
01302       }
01303   }
01304   return false;
01305 }
01306 
01307 bool SQVM::Clone(const SQObjectPtr &self,SQObjectPtr &target)
01308 {
01309   SQObjectPtr temp_reg;
01310   SQObjectPtr newobj;
01311   switch(type(self)){
01312   case OT_TABLE:
01313     newobj = _table(self)->Clone();
01314     goto cloned_mt;
01315   case OT_INSTANCE:
01316     newobj = _instance(self)->Clone(_ss(this));
01317 cloned_mt:
01318     if(_delegable(newobj)->_delegate){
01319       Push(newobj);
01320       Push(self);
01321       CallMetaMethod(_delegable(newobj),MT_CLONED,2,temp_reg);
01322     }
01323     target = newobj;
01324     return true;
01325   case OT_ARRAY:
01326     target = _array(self)->Clone();
01327     return true;
01328   default: return false;
01329   }
01330 }
01331 
01332 bool SQVM::NewSlot(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool bstatic)
01333 {
01334   if(type(key) == OT_NULL) { Raise_Error(_SC("null cannot be used as index")); return false; }
01335   switch(type(self)) {
01336   case OT_TABLE: {
01337     bool rawcall = true;
01338     if(_table(self)->_delegate) {
01339       SQObjectPtr res;
01340       if(!_table(self)->Get(key,res)) {
01341         Push(self);Push(key);Push(val);
01342         rawcall = !CallMetaMethod(_table(self),MT_NEWSLOT,3,res);
01343       }
01344     }
01345     if(rawcall) _table(self)->NewSlot(key,val); //cannot fail
01346 
01347     break;}
01348   case OT_INSTANCE: {
01349     SQObjectPtr res;
01350     Push(self);Push(key);Push(val);
01351     if(!CallMetaMethod(_instance(self),MT_NEWSLOT,3,res)) {
01352       Raise_Error(_SC("class instances do not support the new slot operator"));
01353       return false;
01354     }
01355     break;}
01356   case OT_CLASS:
01357     if(!_class(self)->NewSlot(_ss(this),key,val,bstatic)) {
01358       if(_class(self)->_locked) {
01359         Raise_Error(_SC("trying to modify a class that has already been instantiated"));
01360         return false;
01361       }
01362       else {
01363         SQObjectPtr oval = PrintObjVal(key);
01364         Raise_Error(_SC("the property '%s' already exists"),_stringval(oval));
01365         return false;
01366       }
01367     }
01368     break;
01369   default:
01370     Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key));
01371     return false;
01372     break;
01373   }
01374   return true;
01375 }
01376 
01377 bool SQVM::DeleteSlot(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &res)
01378 {
01379   switch(type(self)) {
01380   case OT_TABLE:
01381   case OT_INSTANCE:
01382   case OT_USERDATA: {
01383     SQObjectPtr t;
01384     bool handled = false;
01385     if(_delegable(self)->_delegate) {
01386       Push(self);Push(key);
01387       handled = CallMetaMethod(_delegable(self),MT_DELSLOT,2,t);
01388     }
01389 
01390     if(!handled) {
01391       if(type(self) == OT_TABLE) {
01392         if(_table(self)->Get(key,t)) {
01393           _table(self)->Remove(key);
01394         }
01395         else {
01396           Raise_IdxError((SQObject &)key);
01397           return false;
01398         }
01399       }
01400       else {
01401         Raise_Error(_SC("cannot delete a slot from %s"),GetTypeName(self));
01402         return false;
01403       }
01404     }
01405     res = t;
01406         }
01407     break;
01408   default:
01409     Raise_Error(_SC("attempt to delete a slot from a %s"),GetTypeName(self));
01410     return false;
01411   }
01412   return true;
01413 }
01414 
01415 bool SQVM::Call(SQObjectPtr &closure,SQInteger nparams,SQInteger stackbase,SQObjectPtr &outres,SQBool raiseerror,SQBool can_suspend)
01416 {
01417 #ifdef _DEBUG
01418 SQInteger prevstackbase = _stackbase;
01419 #endif
01420   switch(type(closure)) {
01421   case OT_CLOSURE: {
01422     assert(!can_suspend || this->_can_suspend);
01423     SQBool backup_suspend = this->_can_suspend;
01424     this->_can_suspend = can_suspend;
01425     bool ret = Execute(closure, _top - nparams, nparams, stackbase,outres,raiseerror);
01426     this->_can_suspend = backup_suspend;
01427     return ret;
01428            }
01429     break;
01430   case OT_NATIVECLOSURE:{
01431     bool suspend;
01432     return CallNative(_nativeclosure(closure), nparams, stackbase, outres,suspend);
01433 
01434               }
01435     break;
01436   case OT_CLASS: {
01437     SQObjectPtr constr;
01438     SQObjectPtr temp;
01439     CreateClassInstance(_class(closure),outres,constr);
01440     if(type(constr) != OT_NULL) {
01441       _stack[stackbase] = outres;
01442       return Call(constr,nparams,stackbase,temp,raiseerror,false);
01443     }
01444     return true;
01445            }
01446     break;
01447   default:
01448     return false;
01449   }
01450 #ifdef _DEBUG
01451   if(!_suspended) {
01452     assert(_stackbase == prevstackbase);
01453   }
01454 #endif
01455   return true;
01456 }
01457 
01458 bool SQVM::CallMetaMethod(SQDelegable *del,SQMetaMethod mm,SQInteger nparams,SQObjectPtr &outres)
01459 {
01460   SQObjectPtr closure;
01461   if(del->GetMetaMethod(this, mm, closure)) {
01462     if(Call(closure, nparams, _top - nparams, outres, SQFalse, SQFalse)) {
01463       Pop(nparams);
01464       return true;
01465     }
01466   }
01467   Pop(nparams);
01468   return false;
01469 }
01470 
01471 void SQVM::Remove(SQInteger n) {
01472   n = (n >= 0)?n + _stackbase - 1:_top + n;
01473   for(SQInteger i = n; i < _top; i++){
01474     _stack[i] = _stack[i+1];
01475   }
01476   _stack[_top] = _null_;
01477   _top--;
01478 }
01479 
01480 void SQVM::Pop() {
01481   _stack[--_top] = _null_;
01482 }
01483 
01484 void SQVM::Pop(SQInteger n) {
01485   for(SQInteger i = 0; i < n; i++){
01486     _stack[--_top] = _null_;
01487   }
01488 }
01489 
01490 void SQVM::Push(const SQObjectPtr &o) { _stack[_top++] = o; }
01491 SQObjectPtr &SQVM::Top() { return _stack[_top-1]; }
01492 SQObjectPtr &SQVM::PopGet() { return _stack[--_top]; }
01493 SQObjectPtr &SQVM::GetUp(SQInteger n) { return _stack[_top+n]; }
01494 SQObjectPtr &SQVM::GetAt(SQInteger n) { return _stack[n]; }
01495 
01496 #ifdef _DEBUG_DUMP
01497 void SQVM::dumpstack(SQInteger stackbase,bool dumpall)
01498 {
01499   SQInteger size=dumpall?_stack.size():_top;
01500   SQInteger n=0;
01501   scprintf(_SC("\n>>>>stack dump<<<<\n"));
01502   CallInfo &ci=_callsstack[_callsstacksize-1];
01503   scprintf(_SC("IP: %p\n"),ci._ip);
01504   scprintf(_SC("prev stack base: %d\n"),ci._prevstkbase);
01505   scprintf(_SC("prev top: %d\n"),ci._prevtop);
01506   for(SQInteger i=0;i<size;i++){
01507     SQObjectPtr &obj=_stack[i];
01508     if(stackbase==i)scprintf(_SC(">"));else scprintf(_SC(" "));
01509     scprintf(_SC("[%d]:"),n);
01510     switch(type(obj)){
01511     case OT_FLOAT:      scprintf(_SC("FLOAT %.3f"),_float(obj));break;
01512     case OT_INTEGER:    scprintf(_SC("INTEGER %d"),_integer(obj));break;
01513     case OT_BOOL:     scprintf(_SC("BOOL %s"),_integer(obj)?"true":"false");break;
01514     case OT_STRING:     scprintf(_SC("STRING %s"),_stringval(obj));break;
01515     case OT_NULL:     scprintf(_SC("NULL"));  break;
01516     case OT_TABLE:      scprintf(_SC("TABLE %p[%p]"),_table(obj),_table(obj)->_delegate);break;
01517     case OT_ARRAY:      scprintf(_SC("ARRAY %p"),_array(obj));break;
01518     case OT_CLOSURE:    scprintf(_SC("CLOSURE [%p]"),_closure(obj));break;
01519     case OT_NATIVECLOSURE:  scprintf(_SC("NATIVECLOSURE"));break;
01520     case OT_USERDATA:   scprintf(_SC("USERDATA %p[%p]"),_userdataval(obj),_userdata(obj)->_delegate);break;
01521     case OT_GENERATOR:    scprintf(_SC("GENERATOR %p"),_generator(obj));break;
01522     case OT_THREAD:     scprintf(_SC("THREAD [%p]"),_thread(obj));break;
01523     case OT_USERPOINTER:  scprintf(_SC("USERPOINTER %p"),_userpointer(obj));break;
01524     case OT_CLASS:      scprintf(_SC("CLASS %p"),_class(obj));break;
01525     case OT_INSTANCE:   scprintf(_SC("INSTANCE %p"),_instance(obj));break;
01526     case OT_WEAKREF:    scprintf(_SC("WEAKERF %p"),_weakref(obj));break;
01527     default:
01528       assert(0);
01529       break;
01530     };
01531     scprintf(_SC("\n"));
01532     ++n;
01533   }
01534 }
01535 
01536 
01537 
01538 #endif

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