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sqvm.cpp

/*
      see copyright notice in squirrel.h
*/
#include "sqpcheader.h"
#include <math.h>
#include <stdlib.h>
#include "sqopcodes.h"
#include "sqfuncproto.h"
#include "sqvm.h"
#include "sqclosure.h"
#include "sqstring.h"
#include "sqtable.h"
#include "squserdata.h"
#include "sqarray.h"
#include "sqclass.h"

#define TOP() (_stack._vals[_top-1])

#define CLEARSTACK(_last_top) { if((_last_top) >= _top) ClearStack(_last_top); }
void SQVM::ClearStack(SQInteger last_top)
{
      SQObjectType tOldType;
      SQObjectValue unOldVal;
      while (last_top >= _top) {
            SQObjectPtr &o = _stack._vals[last_top--];
            tOldType = o._type;
            unOldVal = o._unVal;
            o._type = OT_NULL;
            o._unVal.pUserPointer = NULL;
            __Release(tOldType,unOldVal);
      }
}

bool SQVM::BW_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
{
      SQInteger res;
      SQInteger i1 = _integer(o1), i2 = _integer(o2);
      if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER))
      {
            switch(op) {
                  case BW_AND:      res = i1 & i2; break;
                  case BW_OR:       res = i1 | i2; break;
                  case BW_XOR:      res = i1 ^ i2; break;
                  case BW_SHIFTL:   res = i1 << i2; break;
                  case BW_SHIFTR:   res = i1 >> i2; break;
                  case BW_USHIFTR:res = (SQInteger)(*((SQUnsignedInteger*)&i1) >> i2); break;
                  default: { Raise_Error(_SC("internal vm error bitwise op failed")); return false; }
            }
      }
      else { Raise_Error(_SC("bitwise op between '%s' and '%s'"),GetTypeName(o1),GetTypeName(o2)); return false;}
      trg = res;
      return true;
}

bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
{
      if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
                  if((type(o1)==OT_INTEGER) && (type(o2)==OT_INTEGER)) {
                        SQInteger res, i1 = _integer(o1), i2 = _integer(o2);
                        switch(op) {
                        case '+': res = i1 + i2; break;
                        case '-': res = i1 - i2; break;
                        case '/': if(i2 == 0) { Raise_Error(_SC("division by zero")); return false; }
                              res = i1 / i2;
                              break;
                        case '*': res = i1 * i2; break;
                        case '%': if(i2 == 0) { Raise_Error(_SC("modulo by zero")); return false; }
                              res = i1 % i2;
                              break;
                        default: res = 0xDEADBEEF;
                        }
                        trg = res;
                  }else{
                        SQFloat res, f1 = tofloat(o1), f2 = tofloat(o2);
                        switch(op) {
                        case '+': res = f1 + f2; break;
                        case '-': res = f1 - f2; break;
                        case '/': res = f1 / f2; break;
                        case '*': res = f1 * f2; break;
                        case '%': res = SQFloat(fmod((double)f1,(double)f2)); break;
                        default: res = 0x0f;
                        }
                        trg = res;
                  }
            } else {
                  if(op == '+' &&   (type(o1) == OT_STRING || type(o2) == OT_STRING)){
                              if(!StringCat(o1, o2, trg)) return false;
                  }
                  else if(!ArithMetaMethod(op,o1,o2,trg)) {
                        Raise_Error(_SC("arith op %c on between '%s' and '%s'"),op,GetTypeName(o1),GetTypeName(o2)); return false;
                  }
            }
            return true;
}

SQVM::SQVM(SQSharedState *ss)
{
      _sharedstate=ss;
      _suspended = SQFalse;
      _suspended_target=-1;
      _suspended_root = SQFalse;
      _suspended_traps=-1;
      _foreignptr=NULL;
      _nnativecalls=0;
      _lasterror = _null_;
      _errorhandler = _null_;
      _debughook = _null_;
      ci = NULL;
      INIT_CHAIN();ADD_TO_CHAIN(&_ss(this)->_gc_chain,this);
}

void SQVM::Finalize()
{
      _roottable = _null_;
      _lasterror = _null_;
      _errorhandler = _null_;
      _debughook = _null_;
      temp_reg = _null_;
      _callstackdata.resize(0);
      SQInteger size=_stack.size();
      for(SQInteger i=0;i<size;i++)
            _stack[i]=_null_;
}

SQVM::~SQVM()
{
      Finalize();
      //sq_free(_callsstack,_alloccallsstacksize*sizeof(CallInfo));
      REMOVE_FROM_CHAIN(&_ss(this)->_gc_chain,this);
}

bool SQVM::ArithMetaMethod(SQInteger op,const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &dest)
{
      SQMetaMethod mm;
      switch(op){
            case _SC('+'): mm=MT_ADD; break;
            case _SC('-'): mm=MT_SUB; break;
            case _SC('/'): mm=MT_DIV; break;
            case _SC('*'): mm=MT_MUL; break;
            case _SC('%'): mm=MT_MODULO; break;
            default: mm = MT_ADD; assert(0); break; //shutup compiler
      }
      if(is_delegable(o1) && _delegable(o1)->_delegate) {
            Push(o1);Push(o2);
            return CallMetaMethod(_delegable(o1),mm,2,dest);
      }
      return false;
}

bool SQVM::NEG_OP(SQObjectPtr &trg,const SQObjectPtr &o)
{

      switch(type(o)) {
      case OT_INTEGER:
            trg = -_integer(o);
            return true;
      case OT_FLOAT:
            trg = -_float(o);
            return true;
      case OT_TABLE:
      case OT_USERDATA:
      case OT_INSTANCE:
            if(_delegable(o)->_delegate) {
                  Push(o);
                  if(CallMetaMethod(_delegable(o), MT_UNM, 1, temp_reg)) {
                        trg = temp_reg;
                        return true;
                  }
            }
      default:break; //shutup compiler
      }
      Raise_Error(_SC("attempt to negate a %s"), GetTypeName(o));
      return false;
}

#define _RET_SUCCEED(exp) { result = (exp); return true; }
bool SQVM::ObjCmp(const SQObjectPtr &o1,const SQObjectPtr &o2,SQInteger &result)
{
      if(type(o1)==type(o2)){
            if(_userpointer(o1)==_userpointer(o2))_RET_SUCCEED(0);
            SQObjectPtr res;
            switch(type(o1)){
            case OT_STRING:
                  _RET_SUCCEED(scstrcmp(_stringval(o1),_stringval(o2)));
            case OT_INTEGER:
                  _RET_SUCCEED(_integer(o1)-_integer(o2));
            case OT_FLOAT:
                  _RET_SUCCEED((_float(o1)<_float(o2))?-1:1);
            case OT_TABLE:
            case OT_USERDATA:
            case OT_INSTANCE:
                  if(_delegable(o1)->_delegate) {
                        Push(o1);Push(o2);
                        if(CallMetaMethod(_delegable(o1),MT_CMP,2,res)) break;
                  }
                  //continues through (no break needed)
            default:
                  _RET_SUCCEED( _userpointer(o1) < _userpointer(o2)?-1:1 );
            }
            if(type(res)!=OT_INTEGER) { Raise_CompareError(o1,o2); return false; }
                  _RET_SUCCEED(_integer(res));

      }
      else{
            if(sq_isnumeric(o1) && sq_isnumeric(o2)){
                  if((type(o1)==OT_INTEGER) && (type(o2)==OT_FLOAT)) {
                        if( _integer(o1)==_float(o2) ) { _RET_SUCCEED(0); }
                        else if( _integer(o1)<_float(o2) ) { _RET_SUCCEED(-1); }
                        _RET_SUCCEED(1);
                  }
                  else{
                        if( _float(o1)==_integer(o2) ) { _RET_SUCCEED(0); }
                        else if( _float(o1)<_integer(o2) ) { _RET_SUCCEED(-1); }
                        _RET_SUCCEED(1);
                  }
            }
            else if(type(o1)==OT_NULL) {_RET_SUCCEED(-1);}
            else if(type(o2)==OT_NULL) {_RET_SUCCEED(1);}
            else { Raise_CompareError(o1,o2); return false; }

      }
      assert(0);
      _RET_SUCCEED(0); //cannot happen
}

bool SQVM::CMP_OP(CmpOP op, const SQObjectPtr &o1,const SQObjectPtr &o2,SQObjectPtr &res)
{
      SQInteger r;
      if(ObjCmp(o1,o2,r)) {
            switch(op) {
                  case CMP_G: res = (r > 0)?_true_:_false_; return true;
                  case CMP_GE: res = (r >= 0)?_true_:_false_; return true;
                  case CMP_L: res = (r < 0)?_true_:_false_; return true;
                  case CMP_LE: res = (r <= 0)?_true_:_false_; return true;

            }
            assert(0);
      }
      return false;
}

void SQVM::ToString(const SQObjectPtr &o,SQObjectPtr &res)
{
      switch(type(o)) {
      case OT_STRING:
            res = o;
            return;
      case OT_FLOAT:
            scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%g"),_float(o));
            break;
      case OT_INTEGER:
            // C::B patch: Support for Windows 64 bit
        #if defined(_WIN64)
            scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%I64d"),_integer(o));
            // C::B patch: Support for Linux 64 bit
            #elif  defined(_SQ64)
            scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%ld"),_integer(o));
            #else
            scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%d"),_integer(o));
            #endif
            break;
      case OT_BOOL:
            scsprintf(_sp(rsl(6)),_integer(o)?_SC("true"):_SC("false"));
            break;
      case OT_TABLE:
      case OT_USERDATA:
      case OT_INSTANCE:
            if(_delegable(o)->_delegate) {
                  Push(o);
                  if(CallMetaMethod(_delegable(o),MT_TOSTRING,1,res)) {
                        if(type(res) == OT_STRING)
                              return;
                        //else keeps going to the default
                  }
            }
      default:
            scsprintf(_sp(rsl(sizeof(void*)+20)),_SC("(%s : 0x%p)"),GetTypeName(o),(void*)_rawval(o));
      }
      res = SQString::Create(_ss(this),_spval);
}


bool SQVM::StringCat(const SQObjectPtr &str,const SQObjectPtr &obj,SQObjectPtr &dest)
{
      SQObjectPtr a, b;
      ToString(str, a);
      ToString(obj, b);
      SQInteger l = _string(a)->_len , ol = _string(b)->_len;
      SQChar *s = _sp(rsl(l + ol + 1));
      memcpy(s, _stringval(a), rsl(l));
      memcpy(s + l, _stringval(b), rsl(ol));
      dest = SQString::Create(_ss(this), _spval, l + ol);
      return true;
}

void SQVM::TypeOf(const SQObjectPtr &obj1,SQObjectPtr &dest)
{
      if(is_delegable(obj1) && _delegable(obj1)->_delegate) {
            Push(obj1);
            if(CallMetaMethod(_delegable(obj1),MT_TYPEOF,1,dest))
                  return;
      }
      dest = SQString::Create(_ss(this),GetTypeName(obj1));
}

bool SQVM::Init(SQVM *friendvm, SQInteger stacksize)
{
      _stack.resize(stacksize);
      _alloccallsstacksize = 4;
      _callstackdata.resize(_alloccallsstacksize);
      _callsstacksize = 0;
      _callsstack = &_callstackdata[0];
      _stackbase = 0;
      _top = 0;
      if(!friendvm)
            _roottable = SQTable::Create(_ss(this), 0);
      else {
            _roottable = friendvm->_roottable;
            _errorhandler = friendvm->_errorhandler;
            _debughook = friendvm->_debughook;
      }

      sq_base_register(this);
      return true;
}

extern SQInstructionDesc g_InstrDesc[];

bool SQVM::StartCall(SQClosure *closure,SQInteger target,SQInteger args,SQInteger stackbase,bool tailcall)
{
      SQFunctionProto *func = _funcproto(closure->_function);

      const SQInteger paramssize = func->_nparameters;
      const SQInteger newtop = stackbase + func->_stacksize;
      SQInteger nargs = args;
      if (paramssize != nargs) {
            SQInteger ndef = func->_ndefaultparams;
            SQInteger diff;
            if(ndef && nargs < paramssize && (diff = paramssize - nargs) <= ndef) {
                  for(SQInteger n = ndef - diff; n < ndef; n++) {
                        _stack._vals[stackbase + (nargs++)] = closure->_defaultparams[n];
                  }
            }
            else if(func->_varparams)
            {
                  if (nargs < paramssize) {
                        Raise_Error(_SC("wrong number of parameters"));
                        return false;
                  }
                  for(SQInteger n = 0; n < nargs - paramssize; n++) {
                        _vargsstack.push_back(_stack._vals[stackbase+paramssize+n]);
                        _stack._vals[stackbase+paramssize+n] = _null_;
                  }
            }
            else {
                  Raise_Error(_SC("wrong number of parameters"));
                  return false;
            }
      }

      if(type(closure->_env) == OT_WEAKREF) {
            _stack._vals[stackbase] = _weakref(closure->_env)->_obj;
      }

      if (!tailcall) {
            CallInfo lc;
            lc._generator = NULL;
            lc._etraps = 0;
            lc._prevstkbase = (SQInt32) ( stackbase - _stackbase );
            lc._target = (SQInt32) target;
            lc._prevtop = (SQInt32) (_top - _stackbase);
            lc._ncalls = 1;
            lc._root = SQFalse;
            PUSH_CALLINFO(this, lc);
      }
      else {
            ci->_ncalls++;
      }
      ci->_vargs.size = (SQInt32)(nargs - paramssize);
      ci->_vargs.base = (SQInt32)(_vargsstack.size()-(ci->_vargs.size));
      ci->_closure = closure;
      ci->_literals = func->_literals;
      ci->_ip = func->_instructions;
      //grows the stack if needed
      if (((SQUnsignedInteger)newtop + (func->_stacksize<<1)) > _stack.size()) {
            _stack.resize(_stack.size() + (func->_stacksize<<1));
      }

      _top = newtop;
      _stackbase = stackbase;
      if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
            CallDebugHook(_SC('c'));
      return true;
}

bool SQVM::Return(SQInteger _arg0, SQInteger _arg1, SQObjectPtr &retval)
{
      if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
            for(SQInteger i=0;i<ci->_ncalls;i++)
                  CallDebugHook(_SC('r'));

      SQBool broot = ci->_root;
      SQInteger last_top = _top;
      SQInteger target = ci->_target;
      SQInteger oldstackbase = _stackbase;
      _stackbase -= ci->_prevstkbase;
      _top = _stackbase + ci->_prevtop;
      if(ci->_vargs.size) PopVarArgs(ci->_vargs);
      POP_CALLINFO(this);
      if (broot) {
            if (_arg0 != MAX_FUNC_STACKSIZE) retval = _stack._vals[oldstackbase+_arg1];
            else retval = _null_;
      }
      else {
            if(target != -1) { //-1 is when a class contructor ret value has to be ignored
                  if (_arg0 != MAX_FUNC_STACKSIZE)
                        STK(target) = _stack._vals[oldstackbase+_arg1];
                  else
                        STK(target) = _null_;
            }
      }

      CLEARSTACK(last_top);
      assert(oldstackbase >= _stackbase);
      return broot?true:false;
}

#define _RET_ON_FAIL(exp) { if(!exp) return false; }

bool SQVM::LOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
{
      _RET_ON_FAIL(ARITH_OP( op , target, a, incr));
      a = target;
      return true;
}

bool SQVM::PLOCAL_INC(SQInteger op,SQObjectPtr &target, SQObjectPtr &a, SQObjectPtr &incr)
{
      SQObjectPtr trg;
      _RET_ON_FAIL(ARITH_OP( op , trg, a, incr));
      target = a;
      a = trg;
      return true;
}

bool SQVM::DerefInc(SQInteger op,SQObjectPtr &target, SQObjectPtr &self, SQObjectPtr &key, SQObjectPtr &incr, bool postfix)
{
      SQObjectPtr tmp, tself = self, tkey = key;
      if (!Get(tself, tkey, tmp, false, true)) { Raise_IdxError(tkey); return false; }
      _RET_ON_FAIL(ARITH_OP( op , target, tmp, incr))
      Set(tself, tkey, target,true);
      if (postfix) target = tmp;
      return true;
}

#define arg0 (_i_._arg0)
#define arg1 (_i_._arg1)
#define sarg1 (*((SQInt32 *)&_i_._arg1))
#define arg2 (_i_._arg2)
#define arg3 (_i_._arg3)
#define sarg3 ((SQInteger)*((signed char *)&_i_._arg3))

SQRESULT SQVM::Suspend()
{
      if (_suspended)
            return sq_throwerror(this, _SC("cannot suspend an already suspended vm"));
      if (_nnativecalls!=2)
            return sq_throwerror(this, _SC("cannot suspend through native calls/metamethods"));
      return SQ_SUSPEND_FLAG;
}

void SQVM::PopVarArgs(VarArgs &vargs)
{
      for(SQInteger n = 0; n< vargs.size; n++)
            _vargsstack.pop_back();
}

#define _FINISH(howmuchtojump) {jump = howmuchtojump; return true; }
bool SQVM::FOREACH_OP(SQObjectPtr &o1,SQObjectPtr &o2,SQObjectPtr
&o3,SQObjectPtr &o4,SQInteger arg_2,int exitpos,int &jump)
{
      SQInteger nrefidx;
      switch(type(o1)) {
      case OT_TABLE:
            if((nrefidx = _table(o1)->Next(false,o4, o2, o3)) == -1) _FINISH(exitpos);
            o4 = (SQInteger)nrefidx; _FINISH(1);
      case OT_ARRAY:
            if((nrefidx = _array(o1)->Next(o4, o2, o3)) == -1) _FINISH(exitpos);
            o4 = (SQInteger) nrefidx; _FINISH(1);
      case OT_STRING:
            if((nrefidx = _string(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
            o4 = (SQInteger)nrefidx; _FINISH(1);
      case OT_CLASS:
            if((nrefidx = _class(o1)->Next(o4, o2, o3)) == -1)_FINISH(exitpos);
            o4 = (SQInteger)nrefidx; _FINISH(1);
      case OT_USERDATA:
      case OT_INSTANCE:
            if(_delegable(o1)->_delegate) {
                  SQObjectPtr itr;
                  Push(o1);
                  Push(o4);
                  if(CallMetaMethod(_delegable(o1), MT_NEXTI, 2, itr)){
                        o4 = o2 = itr;
                        if(type(itr) == OT_NULL) _FINISH(exitpos);
                        if(!Get(o1, itr, o3, false,false)) {
                              Raise_Error(_SC("_nexti returned an invalid idx"));
                              return false;
                        }
                        _FINISH(1);
                  }
                  Raise_Error(_SC("_nexti failed"));
                  return false;
            }
            break;
      case OT_GENERATOR:
            if(_generator(o1)->_state == SQGenerator::eDead) _FINISH(exitpos);
            if(_generator(o1)->_state == SQGenerator::eSuspended) {
                  SQInteger idx = 0;
                  if(type(o4) == OT_INTEGER) {
                        idx = _integer(o4) + 1;
                  }
                  o2 = idx;
                  o4 = idx;
                  _generator(o1)->Resume(this, arg_2+1);
                  _FINISH(0);
            }
      default:
            Raise_Error(_SC("cannot iterate %s"), GetTypeName(o1));
      }
      return false; //cannot be hit(just to avoid warnings)
}

bool SQVM::DELEGATE_OP(SQObjectPtr &trg,SQObjectPtr &o1,SQObjectPtr &o2)
{
      if(type(o1) != OT_TABLE) { Raise_Error(_SC("delegating a '%s'"), GetTypeName(o1)); return false; }
      switch(type(o2)) {
      case OT_TABLE:
            if(!_table(o1)->SetDelegate(_table(o2))){
                  Raise_Error(_SC("delegate cycle detected"));
                  return false;
            }
            break;
      case OT_NULL:
            _table(o1)->SetDelegate(NULL);
            break;
      default:
            Raise_Error(_SC("using '%s' as delegate"), GetTypeName(o2));
            return false;
            break;
      }
      trg = o1;
      return true;
}
#define COND_LITERAL (arg3!=0?ci->_literals[arg1]:STK(arg1))

#define _GUARD(exp) { if(!exp) { Raise_Error(_lasterror); SQ_THROW();} }

#define SQ_THROW() { goto exception_trap; }

bool SQVM::CLOSURE_OP(SQObjectPtr &target, SQFunctionProto *func)
{
      SQInteger nouters;
      SQClosure *closure = SQClosure::Create(_ss(this), func);
      if((nouters = func->_noutervalues)) {
            closure->_outervalues.reserve(nouters);
            for(SQInteger i = 0; i<nouters; i++) {
                  SQOuterVar &v = func->_outervalues[i];
                  switch(v._type){
                  case otSYMBOL:
                        closure->_outervalues.push_back(_null_);
                        if(!Get(_stack._vals[_stackbase]/*STK(0)*/, v._src, closure->_outervalues.top(), false,true))
                        {Raise_IdxError(v._src); return false; }
                        break;
                  case otLOCAL:
                        closure->_outervalues.push_back(_stack._vals[_stackbase+_integer(v._src)]);
                        break;
                  case otOUTER:
                        closure->_outervalues.push_back(_closure(ci->_closure)->_outervalues[_integer(v._src)]);
                        break;
                  }
            }
      }
      SQInteger ndefparams;
      if((ndefparams = func->_ndefaultparams)) {
            closure->_defaultparams.reserve(ndefparams);
            for(SQInteger i = 0; i < ndefparams; i++) {
                  SQInteger spos = func->_defaultparams[i];
                  closure->_defaultparams.push_back(_stack._vals[_stackbase + spos]);
            }
      }
      target = closure;
      return true;

}

bool SQVM::GETVARGV_OP(SQObjectPtr &target,SQObjectPtr &index,CallInfo *ci)
{
      if(ci->_vargs.size == 0) {
            Raise_Error(_SC("the function doesn't have var args"));
            return false;
      }
      if(!sq_isnumeric(index)){
            Raise_Error(_SC("indexing 'vargv' with %s"),GetTypeName(index));
            return false;
      }
      SQInteger idx = tointeger(index);
      if(idx < 0 || idx >= ci->_vargs.size){ Raise_Error(_SC("vargv index out of range")); return false; }
      target = _vargsstack[ci->_vargs.base+idx];
      return true;
}

bool SQVM::CLASS_OP(SQObjectPtr &target,SQInteger baseclass,SQInteger attributes)
{
      SQClass *base = NULL;
      SQObjectPtr attrs;
      if(baseclass != -1) {
            if(type(_stack._vals[_stackbase+baseclass]) != OT_CLASS) { Raise_Error(_SC("trying to inherit from a %s"),GetTypeName(_stack._vals[_stackbase+baseclass])); return false; }
            base = _class(_stack._vals[_stackbase + baseclass]);
      }
      if(attributes != MAX_FUNC_STACKSIZE) {
            attrs = _stack._vals[_stackbase+attributes];
      }
      target = SQClass::Create(_ss(this),base);
      if(type(_class(target)->_metamethods[MT_INHERITED]) != OT_NULL) {
            int nparams = 2;
            SQObjectPtr ret;
            Push(target); Push(attrs);
            Call(_class(target)->_metamethods[MT_INHERITED],nparams,_top - nparams, ret, false);
            Pop(nparams);
      }
      _class(target)->_attributes = attrs;
      return true;
}



bool SQVM::IsEqual(SQObjectPtr &o1,SQObjectPtr &o2,bool &res)
{
      if(type(o1) == type(o2)) {
            res = ((_userpointer(o1) == _userpointer(o2)?true:false));
      }
      else {
            if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
                  SQInteger cmpres;
                  if(!ObjCmp(o1, o2,cmpres)) return false;
                  res = (cmpres == 0);
            }
            else {
                  res = false;
            }
      }
      return true;
}

bool SQVM::IsFalse(SQObjectPtr &o)
{
      // C::B patch: Eliminate compiler warnings
      if(( (type(o) & SQOBJECT_CANBEFALSE) && ( (type(o) == OT_FLOAT) && (_float(o) == SQFloat(0.0))) )
            || (_integer(o) == 0) ) { //OT_NULL|OT_INTEGER|OT_BOOL
            return true;
      }
      return false;
}

bool SQVM::GETPARENT_OP(SQObjectPtr &o,SQObjectPtr &target)
{
      switch(type(o)) {
            case OT_TABLE: target = _table(o)->_delegate?SQObjectPtr(_table(o)->_delegate):_null_;
                  break;
            case OT_CLASS: target = _class(o)->_base?_class(o)->_base:_null_;
                  break;
            default:
                  Raise_Error(_SC("the %s type doesn't have a parent slot"), GetTypeName(o));
                  return false;
      }
      return true;
}

bool SQVM::Execute(SQObjectPtr &closure, SQInteger target, SQInteger nargs, SQInteger stackbase,SQObjectPtr &outres, SQBool raiseerror,ExecutionType et)
{
      if ((_nnativecalls + 1) > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
      _nnativecalls++;
      AutoDec ad(&_nnativecalls);
      SQInteger traps = 0;
      //temp_reg vars for OP_CALL
      SQInteger ct_target;
      SQInteger ct_stackbase;
      bool ct_tailcall;

      switch(et) {
            case ET_CALL: {
                  SQInteger last_top = _top;
                  temp_reg = closure;
                  if(!StartCall(_closure(temp_reg), _top - nargs, nargs, stackbase, false)) {
                        //call the handler if there are no calls in the stack, if not relies on the previous node
                        if(ci == NULL) CallErrorHandler(_lasterror);
                        return false;
                  }
                  if (_funcproto(_closure(temp_reg)->_function)->_bgenerator) {
                        // C::B patch: Eliminate compiler warnings
                        //SQFunctionProto *f = _funcproto(_closure(temp_reg)->_function);
                        SQGenerator *gen = SQGenerator::Create(_ss(this), _closure(temp_reg));
                        _GUARD(gen->Yield(this));
                        Return(1, ci->_target, temp_reg);
                        outres = gen;
                        CLEARSTACK(last_top);
                        return true;
                  }
                  ci->_root = SQTrue;
                                }
                  break;
            case ET_RESUME_GENERATOR: _generator(closure)->Resume(this, target); ci->_root = SQTrue; traps += ci->_etraps; break;
            case ET_RESUME_VM:
            case ET_RESUME_THROW_VM:
                  traps = _suspended_traps;
                  ci->_root = _suspended_root;
                  ci->_vargs = _suspend_varargs;
                  _suspended = SQFalse;
                  if(et  == ET_RESUME_THROW_VM) { SQ_THROW(); }
                  break;
      }

exception_restore:
      //
      {
            for(;;)
            {
                  const SQInstruction &_i_ = *ci->_ip++;
                  //dumpstack(_stackbase);
                  //scprintf("\n[%d] %s %d %d %d %d\n",ci->_ip-ci->_iv->_vals,g_InstrDesc[_i_.op].name,arg0,arg1,arg2,arg3);
                  switch(_i_.op)
                  {
                  case _OP_LINE:
                        if(type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
                              CallDebugHook(_SC('l'),arg1);
                        continue;
                  case _OP_LOAD: TARGET = ci->_literals[arg1]; continue;
                  case _OP_LOADINT: TARGET = (SQInteger)arg1; continue;
                  case _OP_LOADFLOAT: TARGET = *((SQFloat *)&arg1); continue;
                  case _OP_DLOAD: TARGET = ci->_literals[arg1]; STK(arg2) = ci->_literals[arg3];continue;
                  case _OP_TAILCALL:
                        temp_reg = STK(arg1);
                        if (type(temp_reg) == OT_CLOSURE && !_funcproto(_closure(temp_reg)->_function)->_bgenerator){
                              ct_tailcall = true;
                              if(ci->_vargs.size) PopVarArgs(ci->_vargs);
                              for (SQInteger i = 0; i < arg3; i++) STK(i) = STK(arg2 + i);
                              ct_target = ci->_target;
                              ct_stackbase = _stackbase;
                              goto common_call;
                        }
                  case _OP_CALL: {
                              ct_tailcall = false;
                              ct_target = arg0;
                              temp_reg = STK(arg1);
                              ct_stackbase = _stackbase+arg2;

common_call:
                              SQObjectPtr clo = temp_reg;
                              SQInteger last_top = _top;
                              switch (type(clo)) {
                              case OT_CLOSURE:{
                                    _GUARD(StartCall(_closure(clo), ct_target, arg3, ct_stackbase, ct_tailcall));
                                    if (_funcproto(_closure(clo)->_function)->_bgenerator) {
                                          SQGenerator *gen = SQGenerator::Create(_ss(this), _closure(clo));
                                          _GUARD(gen->Yield(this));
                                          Return(1, ct_target, clo);
                                          STK(ct_target) = gen;
                                          CLEARSTACK(last_top);
                                          continue;
                                    }
                                    }
                                    continue;
                              case OT_NATIVECLOSURE: {
                                    bool suspend;
                                    _GUARD(CallNative(_nativeclosure(clo), arg3, ct_stackbase, clo,suspend));
                                    if(suspend){
                                          _suspended = SQTrue;
                                          _suspended_target = ct_target;
                                          _suspended_root = ci->_root;
                                          _suspended_traps = traps;
                                          _suspend_varargs = ci->_vargs;
                                          outres = clo;
                                          return true;
                                    }
                                    if(ct_target != -1) { //skip return value for constructors
                                          STK(ct_target) = clo;
                                    }
                                                               }
                                    continue;
                              case OT_CLASS:{
                                    SQObjectPtr inst;
                                    _GUARD(CreateClassInstance(_class(clo),inst,temp_reg));
                                    STK(ct_target) = inst;
                                    ct_target = -1; //fakes return value target so that is not overwritten by the constructor
                                    if(type(temp_reg) != OT_NULL) {
                                          _stack._vals[ct_stackbase] = inst;
                                          goto common_call; //hard core spaghetti code(reissues the OP_CALL to invoke the constructor)
                                    }
                                    }
                                    break;
                              case OT_TABLE:
                              case OT_USERDATA:
                              case OT_INSTANCE:
                                    {
                                    Push(clo);
                                    for (SQInteger i = 0; i < arg3; i++) Push(STK(arg2 + i));
                                    if (_delegable(clo) && CallMetaMethod(_delegable(clo), MT_CALL, arg3+1, clo)){
                                          STK(ct_target) = clo;
                                          break;
                                    }
                                    Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
                                    SQ_THROW();
                                }
                              default:
                                    Raise_Error(_SC("attempt to call '%s'"), GetTypeName(clo));
                                    SQ_THROW();
                              }
                        }
                          continue;
                  case _OP_PREPCALL:
                  case _OP_PREPCALLK:
                        {
                              SQObjectPtr &key = _i_.op == _OP_PREPCALLK?(ci->_literals)[arg1]:STK(arg1);
                              SQObjectPtr &o = STK(arg2);
                              if (!Get(o, key, temp_reg,false,true)) {
                                    if(type(o) == OT_CLASS) { //hack?
                                          if(_class_ddel->Get(key,temp_reg)) {
                                                STK(arg3) = o;
                                                TARGET = temp_reg;
                                                continue;
                                          }
                                    }
                                    { Raise_IdxError(key); SQ_THROW();}
                              }

                              STK(arg3) = type(o) == OT_CLASS?STK(0):o;
                              TARGET = temp_reg;
                        }
                        continue;
                  case _OP_GETK:
                        if (!Get(STK(arg2), ci->_literals[arg1], temp_reg, false,true)) { Raise_IdxError(ci->_literals[arg1]); SQ_THROW();}
                        TARGET = temp_reg;
                        continue;
                  case _OP_MOVE: TARGET = STK(arg1); continue;
                  case _OP_NEWSLOT:
                        _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),false));
                        if(arg0 != arg3) TARGET = STK(arg3);
                        continue;
                  case _OP_DELETE: _GUARD(DeleteSlot(STK(arg1), STK(arg2), TARGET)); continue;
                  case _OP_SET:
                        if (!Set(STK(arg1), STK(arg2), STK(arg3),true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
                        if (arg0 != arg3) TARGET = STK(arg3);
                        continue;
                  case _OP_GET:
                        if (!Get(STK(arg1), STK(arg2), temp_reg, false,true)) { Raise_IdxError(STK(arg2)); SQ_THROW(); }
                        TARGET = temp_reg;
                        continue;
                  case _OP_EQ:{
                        bool res;
                        if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
                        TARGET = res?_true_:_false_;
                        }continue;
                  case _OP_NE:{
                        bool res;
                        if(!IsEqual(STK(arg2),COND_LITERAL,res)) { SQ_THROW(); }
                        TARGET = (!res)?_true_:_false_;
                        } continue;
                  case _OP_ARITH: _GUARD(ARITH_OP( arg3 , temp_reg, STK(arg2), STK(arg1))); TARGET = temp_reg; continue;
                  case _OP_BITW:    _GUARD(BW_OP( arg3,TARGET,STK(arg2),STK(arg1))); continue;
                  case _OP_RETURN:
                        if(ci->_generator) {
                              ci->_generator->Kill();
                        }
                        if(Return(arg0, arg1, temp_reg)){
                              assert(traps==0);
                              outres = temp_reg;
                              return true;
                        }
                        continue;
                  case _OP_LOADNULLS:{ for(SQInt32 n=0; n < arg1; n++) STK(arg0+n) = _null_; }continue;
                  case _OP_LOADROOTTABLE: TARGET = _roottable; continue;
                  case _OP_LOADBOOL: TARGET = arg1?_true_:_false_; continue;
                  case _OP_DMOVE: STK(arg0) = STK(arg1); STK(arg2) = STK(arg3); continue;
                  case _OP_JMP: ci->_ip += (sarg1); continue;
                  case _OP_JNZ: if(!IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
                  case _OP_JZ: if(IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
                  case _OP_LOADFREEVAR: TARGET = _closure(ci->_closure)->_outervalues[arg1]; continue;
                  case _OP_VARGC: TARGET = SQInteger(ci->_vargs.size); continue;
                  case _OP_GETVARGV:
                        if(!GETVARGV_OP(TARGET,STK(arg1),ci)) { SQ_THROW(); }
                        continue;
                  case _OP_NEWTABLE: TARGET = SQTable::Create(_ss(this), arg1); continue;
                  case _OP_NEWARRAY: TARGET = SQArray::Create(_ss(this), 0); _array(TARGET)->Reserve(arg1); continue;
                  case _OP_APPENDARRAY: _array(STK(arg0))->Append(COND_LITERAL);    continue;
                  case _OP_GETPARENT: _GUARD(GETPARENT_OP(STK(arg1),TARGET)); continue;
                  case _OP_COMPARITH: _GUARD(DerefInc(arg3, TARGET, STK((((SQUnsignedInteger)arg1&0xFFFF0000)>>16)), STK(arg2), STK(arg1&0x0000FFFF), false)); continue;
                  case _OP_COMPARITHL: _GUARD(LOCAL_INC(arg3, TARGET, STK(arg1), STK(arg2))); continue;
                  case _OP_INC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, false));} continue;
                  case _OP_INCL: {SQObjectPtr o(sarg3); _GUARD(LOCAL_INC('+',TARGET, STK(arg1), o));} continue;
                  case _OP_PINC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, true));} continue;
                  case _OP_PINCL:   {SQObjectPtr o(sarg3); _GUARD(PLOCAL_INC('+',TARGET, STK(arg1), o));} continue;
                  case _OP_CMP:     _GUARD(CMP_OP((CmpOP)arg3,STK(arg2),STK(arg1),TARGET))      continue;
                  case _OP_EXISTS: TARGET = Get(STK(arg1), STK(arg2), temp_reg, true,false)?_true_:_false_;continue;
                  case _OP_INSTANCEOF:
                        if(type(STK(arg1)) != OT_CLASS || type(STK(arg2)) != OT_INSTANCE)
                        {Raise_Error(_SC("cannot apply instanceof between a %s and a %s"),GetTypeName(STK(arg1)),GetTypeName(STK(arg2))); SQ_THROW();}
                        TARGET = _instance(STK(arg2))->InstanceOf(_class(STK(arg1)))?_true_:_false_;
                        continue;
                  case _OP_AND:
                        if(IsFalse(STK(arg2))) {
                              TARGET = STK(arg2);
                              ci->_ip += (sarg1);
                        }
                        continue;
                  case _OP_OR:
                        if(!IsFalse(STK(arg2))) {
                              TARGET = STK(arg2);
                              ci->_ip += (sarg1);
                        }
                        continue;
                  case _OP_NEG: _GUARD(NEG_OP(TARGET,STK(arg1))); continue;
                  case _OP_NOT: TARGET = (IsFalse(STK(arg1))?_true_:_false_); continue;
                  case _OP_BWNOT:
                        if(type(STK(arg1)) == OT_INTEGER) {
                              SQInteger t = _integer(STK(arg1));
                              TARGET = SQInteger(~t);
                              continue;
                        }
                        Raise_Error(_SC("attempt to perform a bitwise op on a %s"), GetTypeName(STK(arg1)));
                        SQ_THROW();
                  case _OP_CLOSURE: {
                        SQClosure *c = ci->_closure._unVal.pClosure;
                        SQFunctionProto *fp = c->_function._unVal.pFunctionProto;
                        if(!CLOSURE_OP(TARGET,fp->_functions[arg1]._unVal.pFunctionProto)) { SQ_THROW(); }
                        continue;
                  }
                  case _OP_YIELD:{
                        if(ci->_generator) {
                              if(sarg1 != MAX_FUNC_STACKSIZE) temp_reg = STK(arg1);
                              _GUARD(ci->_generator->Yield(this));
                              traps -= ci->_etraps;
                              if(sarg1 != MAX_FUNC_STACKSIZE) STK(arg1) = temp_reg;
                        }
                        else { Raise_Error(_SC("trying to yield a '%s',only genenerator can be yielded"), GetTypeName(ci->_generator)); SQ_THROW();}
                        if(Return(arg0, arg1, temp_reg)){
                              assert(traps == 0);
                              outres = temp_reg;
                              return true;
                        }

                        }
                        continue;
                  case _OP_RESUME:
                        if(type(STK(arg1)) != OT_GENERATOR){ Raise_Error(_SC("trying to resume a '%s',only genenerator can be resumed"), GetTypeName(STK(arg1))); SQ_THROW();}
                        _GUARD(_generator(STK(arg1))->Resume(this, arg0));
                        traps += ci->_etraps;
                continue;
                  case _OP_FOREACH:{ int tojump;
                        _GUARD(FOREACH_OP(STK(arg0),STK(arg2),STK(arg2+1),STK(arg2+2),arg2,sarg1,tojump));
                        ci->_ip += tojump; }
                        continue;
                  case _OP_POSTFOREACH:
                        assert(type(STK(arg0)) == OT_GENERATOR);
                        if(_generator(STK(arg0))->_state == SQGenerator::eDead)
                              ci->_ip += (sarg1 - 1);
                        continue;
                  case _OP_DELEGATE: _GUARD(DELEGATE_OP(TARGET,STK(arg1),STK(arg2))); continue;
                  case _OP_CLONE:
                        if(!Clone(STK(arg1), TARGET))
                        { Raise_Error(_SC("cloning a %s"), GetTypeName(STK(arg1))); SQ_THROW();}
                        continue;
                  case _OP_TYPEOF: TypeOf(STK(arg1), TARGET); continue;
                  case _OP_PUSHTRAP:{
                        SQInstruction *_iv = _funcproto(_closure(ci->_closure)->_function)->_instructions;
                        _etraps.push_back(SQExceptionTrap(_top,_stackbase, &_iv[(ci->_ip-_iv)+arg1], arg0)); traps++;
                        ci->_etraps++;
                                            }
                        continue;
                  case _OP_POPTRAP: {
                        for(SQInteger i = 0; i < arg0; i++) {
                              _etraps.pop_back(); traps--;
                              ci->_etraps--;
                        }
                                            }
                        continue;
                  case _OP_THROW:   Raise_Error(TARGET); SQ_THROW(); continue;
                  case _OP_CLASS: _GUARD(CLASS_OP(TARGET,arg1,arg2)); continue;
                  case _OP_NEWSLOTA:
                        bool bstatic = (arg0&NEW_SLOT_STATIC_FLAG)?true:false;
                        if(type(STK(arg1)) == OT_CLASS) {
                              if(type(_class(STK(arg1))->_metamethods[MT_NEWMEMBER]) != OT_NULL ) {
                                    Push(STK(arg1)); Push(STK(arg2)); Push(STK(arg3));
                                    Push((arg0&NEW_SLOT_ATTRIBUTES_FLAG) ? STK(arg2-1) : _null_);
                                    int nparams = 4;
                                    if(Call(_class(STK(arg1))->_metamethods[MT_NEWMEMBER], nparams, _top - nparams, temp_reg,SQFalse)) {
                                          Pop(nparams);
                                          continue;
                                    }
                              }
                        }
                        _GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3),bstatic));
                        if((arg0&NEW_SLOT_ATTRIBUTES_FLAG)) {
                              _class(STK(arg1))->SetAttributes(STK(arg2),STK(arg2-1));
                        }
                        continue;
                  }

            }
      }
exception_trap:
      {
            SQObjectPtr currerror = _lasterror;
//          dumpstack(_stackbase);
            SQInteger n = 0;
            SQInteger last_top = _top;
            if(ci) {
                  if(_ss(this)->_notifyallexceptions) CallErrorHandler(currerror);

                  if(traps) {
                        do {
                              if(ci->_etraps > 0) {
                                    SQExceptionTrap &et = _etraps.top();
                                    ci->_ip = et._ip;
                                    _top = et._stacksize;
                                    _stackbase = et._stackbase;
                                    _stack._vals[_stackbase+et._extarget] = currerror;
                                    _etraps.pop_back(); traps--; ci->_etraps--;
                                    CLEARSTACK(last_top);
                                    goto exception_restore;
                              }
                              //if is a native closure
                              if(type(ci->_closure) != OT_CLOSURE && n)
                                    break;
                              if(ci->_generator) ci->_generator->Kill();
                              PopVarArgs(ci->_vargs);
                              POP_CALLINFO(this);
                              n++;
                        } while(_callsstacksize);
                  }
                  else {
                        //call the hook
                        if(raiseerror && !_ss(this)->_notifyallexceptions)
                              CallErrorHandler(currerror);
                  }
                  //remove call stack until a C function is found or the cstack is empty
                  if(ci) do {
                        SQBool exitafterthisone = ci->_root;
                        if(ci->_generator) ci->_generator->Kill();
                        _stackbase -= ci->_prevstkbase;
                        _top = _stackbase + ci->_prevtop;
                        PopVarArgs(ci->_vargs);
                        POP_CALLINFO(this);
                        if( (ci && type(ci->_closure) != OT_CLOSURE) || exitafterthisone) break;
                  } while(_callsstacksize);

                  CLEARSTACK(last_top);
            }
            _lasterror = currerror;
            return false;
      }
      assert(0);
}

bool SQVM::CreateClassInstance(SQClass *theclass, SQObjectPtr &inst, SQObjectPtr &constructor)
{
      inst = theclass->CreateInstance();
      if(!theclass->Get(_ss(this)->_constructoridx,constructor)) {
            constructor = _null_;
      }
      return true;
}

void SQVM::CallErrorHandler(SQObjectPtr &error)
{
      if(type(_errorhandler) != OT_NULL) {
            SQObjectPtr out;
            Push(_roottable); Push(error);
            Call(_errorhandler, 2, _top-2, out,SQFalse);
            Pop(2);
      }
}

void SQVM::CallDebugHook(SQInteger type,SQInteger forcedline)
{
      SQObjectPtr temp_reg;
      SQInteger nparams=5;
      SQFunctionProto *func=_funcproto(_closure(ci->_closure)->_function);
      Push(_roottable); Push(type); Push(func->_sourcename); Push(forcedline?forcedline:func->GetLine(ci->_ip)); Push(func->_name);
      Call(_debughook,nparams,_top-nparams,temp_reg,SQFalse);
      Pop(nparams);
}

bool SQVM::CallNative(SQNativeClosure *nclosure,SQInteger nargs,SQInteger stackbase,SQObjectPtr &retval,bool &suspend)
{
      if (_nnativecalls + 1 > MAX_NATIVE_CALLS) { Raise_Error(_SC("Native stack overflow")); return false; }
      SQInteger nparamscheck = nclosure->_nparamscheck;
      if(((nparamscheck > 0) && (nparamscheck != nargs))
            || ((nparamscheck < 0) && (nargs < (-nparamscheck)))) {
            Raise_Error(_SC("wrong number of parameters"));
            return false;
            }

      SQInteger tcs;
      if((tcs = nclosure->_typecheck.size())) {
            for(SQInteger i = 0; i < nargs && i < tcs; i++)
                  if((nclosure->_typecheck._vals[i] != -1) && !(type(_stack._vals[stackbase+i]) & nclosure->_typecheck[i])) {
                Raise_ParamTypeError(i,nclosure->_typecheck._vals[i],type(_stack._vals[stackbase+i]));
                        return false;
                  }
      }
      _nnativecalls++;
      if ((_top + MIN_STACK_OVERHEAD) > (SQInteger)_stack.size()) {
            _stack.resize(_stack.size() + (MIN_STACK_OVERHEAD<<1));
      }
      SQInteger oldtop = _top;
      SQInteger oldstackbase = _stackbase;
      _top = stackbase + nargs;
      CallInfo lci;
      lci._closure = nclosure;
      lci._generator = NULL;
      lci._etraps = 0;
      lci._prevstkbase = (SQInt32) (stackbase - _stackbase);
      lci._ncalls = 1;
      lci._prevtop = (SQInt32) (oldtop - oldstackbase);
      PUSH_CALLINFO(this, lci);
      _stackbase = stackbase;
      //push free variables
      SQInteger outers = nclosure->_outervalues.size();
      for (SQInteger i = 0; i < outers; i++) {
            Push(nclosure->_outervalues[i]);
      }

      if(type(nclosure->_env) == OT_WEAKREF) {
            _stack[stackbase] = _weakref(nclosure->_env)->_obj;
      }


      SQInteger ret = (nclosure->_function)(this);
      _nnativecalls--;
      suspend = false;
      if( ret == SQ_SUSPEND_FLAG) suspend = true;
      else if (ret < 0) {
            _stackbase = oldstackbase;
            _top = oldtop;
            POP_CALLINFO(this);
            Raise_Error(_lasterror);
            return false;
      }

      if (ret != 0){ retval = TOP(); TOP().Null(); }
      else { retval = _null_; }
      _stackbase = oldstackbase;
      _top = oldtop;
      POP_CALLINFO(this);
      return true;
}

bool SQVM::Get(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw, bool fetchroot)
{
      switch(type(self)){
      case OT_TABLE:
            if(_table(self)->Get(key,dest))return true;
            break;
      case OT_ARRAY:
            if(sq_isnumeric(key)){
                  return _array(self)->Get(tointeger(key),dest);
            }
            break;
      case OT_INSTANCE:
            if(_instance(self)->Get(key,dest)) return true;
            break;
      default:break; //shut up compiler
      }
      if(FallBackGet(self,key,dest,raw)) return true;

      if(fetchroot) {
            if(_rawval(STK(0)) == _rawval(self) &&
                  type(STK(0)) == type(self)) {
                        return _table(_roottable)->Get(key,dest);
            }
      }
      return false;
}

bool SQVM::FallBackGet(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw)
{
      switch(type(self)){
      case OT_CLASS:
            return _class(self)->Get(key,dest);
            break;
      case OT_TABLE:
      case OT_USERDATA:
        //delegation
            if(_delegable(self)->_delegate) {
                  if(Get(SQObjectPtr(_delegable(self)->_delegate),key,dest,raw,false))
                        return true;
                  if(raw)return false;
                  Push(self);Push(key);
                  if(CallMetaMethod(_delegable(self),MT_GET,2,dest))
                        return true;
            }
            if(type(self) == OT_TABLE) {
                  if(raw) return false;
                  return _table_ddel->Get(key,dest);
            }
            return false;
            break;
      case OT_ARRAY:
            if(raw)return false;
            return _array_ddel->Get(key,dest);
      case OT_STRING:
            if(sq_isnumeric(key)){
                  SQInteger n=tointeger(key);
                  if(abs((int)n)<_string(self)->_len){
                        if(n<0)n=_string(self)->_len-n;
                        dest=SQInteger(_stringval(self)[n]);
                        return true;
                  }
                  return false;
            }
            else {
                  if(raw)return false;
                  return _string_ddel->Get(key,dest);
            }
            break;
      case OT_INSTANCE:
            if(raw)return false;
            Push(self);Push(key);
            if(!CallMetaMethod(_delegable(self),MT_GET,2,dest)) {
                  return _instance_ddel->Get(key,dest);
            }
            return true;
      case OT_INTEGER:case OT_FLOAT:case OT_BOOL:
            if(raw)return false;
            return _number_ddel->Get(key,dest);
      case OT_GENERATOR:
            if(raw)return false;
            return _generator_ddel->Get(key,dest);
      case OT_CLOSURE: case OT_NATIVECLOSURE:
            if(raw)return false;
            return _closure_ddel->Get(key,dest);
      case OT_THREAD:
            if(raw)return false;
            return  _thread_ddel->Get(key,dest);
      case OT_WEAKREF:
            if(raw)return false;
            return  _weakref_ddel->Get(key,dest);
      default:return false;
      }
      return false;
}

bool SQVM::Set(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool fetchroot)
{
      switch(type(self)){
      case OT_TABLE:
            if(_table(self)->Set(key,val))
                  return true;
            if(_table(self)->_delegate) {
                  if(Set(_table(self)->_delegate,key,val,false)) {
                        return true;
                  }
            }
            //keeps going
      case OT_USERDATA:
            if(_delegable(self)->_delegate) {
                  SQObjectPtr t;
                  Push(self);Push(key);Push(val);
                  if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
            }
            break;
      case OT_INSTANCE:{
            if(_instance(self)->Set(key,val))
                  return true;
            SQObjectPtr t;
            Push(self);Push(key);Push(val);
            if(CallMetaMethod(_delegable(self),MT_SET,3,t)) return true;
            }
            break;
      case OT_ARRAY:
            if(!sq_isnumeric(key)) {Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key)); return false; }
            return _array(self)->Set(tointeger(key),val);
      default:
            Raise_Error(_SC("trying to set '%s'"),GetTypeName(self));
            return false;
      }
      if(fetchroot) {
            if(_rawval(STK(0)) == _rawval(self) &&
                  type(STK(0)) == type(self)) {
                        return _table(_roottable)->Set(key,val);
                  }
      }
      return false;
}

bool SQVM::Clone(const SQObjectPtr &self,SQObjectPtr &target)
{
      SQObjectPtr temp_reg;
      SQObjectPtr newobj;
      switch(type(self)){
      case OT_TABLE:
            newobj = _table(self)->Clone();
            goto cloned_mt;
      case OT_INSTANCE:
            newobj = _instance(self)->Clone(_ss(this));
cloned_mt:
            if(_delegable(newobj)->_delegate){
                  Push(newobj);
                  Push(self);
                  CallMetaMethod(_delegable(newobj),MT_CLONED,2,temp_reg);
            }
            target = newobj;
            return true;
      case OT_ARRAY:
            target = _array(self)->Clone();
            return true;
      default: return false;
      }
}

bool SQVM::NewSlot(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,bool bstatic)
{
      if(type(key) == OT_NULL) { Raise_Error(_SC("null cannot be used as index")); return false; }
      switch(type(self)) {
      case OT_TABLE: {
            bool rawcall = true;
            if(_table(self)->_delegate) {
                  SQObjectPtr res;
                  if(!_table(self)->Get(key,res)) {
                        Push(self);Push(key);Push(val);
                        rawcall = !CallMetaMethod(_table(self),MT_NEWSLOT,3,res);
                  }
            }
            if(rawcall) _table(self)->NewSlot(key,val); //cannot fail

            break;}
      case OT_INSTANCE: {
            SQObjectPtr res;
            Push(self);Push(key);Push(val);
            if(!CallMetaMethod(_instance(self),MT_NEWSLOT,3,res)) {
                  Raise_Error(_SC("class instances do not support the new slot operator"));
                  return false;
            }
            break;}
      case OT_CLASS:
            if(!_class(self)->NewSlot(_ss(this),key,val,bstatic)) {
                  if(_class(self)->_locked) {
                        Raise_Error(_SC("trying to modify a class that has already been instantiated"));
                        return false;
                  }
                  else {
                        SQObjectPtr oval = PrintObjVal(key);
                        Raise_Error(_SC("the property '%s' already exists"),_stringval(oval));
                        return false;
                  }
            }
            break;
      default:
            Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key));
            return false;
            break;
      }
      return true;
}

bool SQVM::DeleteSlot(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &res)
{
      switch(type(self)) {
      case OT_TABLE:
      case OT_INSTANCE:
      case OT_USERDATA: {
            SQObjectPtr t;
            bool handled = false;
            if(_delegable(self)->_delegate) {
                  Push(self);Push(key);
                  handled = CallMetaMethod(_delegable(self),MT_DELSLOT,2,t);
            }

            if(!handled) {
                  if(type(self) == OT_TABLE) {
                        if(_table(self)->Get(key,t)) {
                              _table(self)->Remove(key);
                        }
                        else {
                              Raise_IdxError((SQObject &)key);
                              return false;
                        }
                  }
                  else {
                        Raise_Error(_SC("cannot delete a slot from %s"),GetTypeName(self));
                        return false;
                  }
            }
            res = t;
                        }
            break;
      default:
            Raise_Error(_SC("attempt to delete a slot from a %s"),GetTypeName(self));
            return false;
      }
      return true;
}

bool SQVM::Call(SQObjectPtr &closure,SQInteger nparams,SQInteger stackbase,SQObjectPtr &outres,SQBool raiseerror)
{
#ifdef _DEBUG
SQInteger prevstackbase = _stackbase;
#endif
      switch(type(closure)) {
      case OT_CLOSURE:
            return Execute(closure, _top - nparams, nparams, stackbase,outres,raiseerror);
            break;
      case OT_NATIVECLOSURE:{
            bool suspend;
            return CallNative(_nativeclosure(closure), nparams, stackbase, outres,suspend);

                                      }
            break;
      case OT_CLASS: {
            SQObjectPtr constr;
            SQObjectPtr temp;
            CreateClassInstance(_class(closure),outres,constr);
            if(type(constr) != OT_NULL) {
                  _stack[stackbase] = outres;
                  return Call(constr,nparams,stackbase,temp,raiseerror);
            }
            return true;
                           }
            break;
      default:
            return false;
      }
#ifdef _DEBUG
      if(!_suspended) {
            assert(_stackbase == prevstackbase);
      }
#endif
      return true;
}

bool SQVM::CallMetaMethod(SQDelegable *del,SQMetaMethod mm,SQInteger nparams,SQObjectPtr &outres)
{
      SQObjectPtr closure;
      if(del->GetMetaMethod(this, mm, closure)) {
            if(Call(closure, nparams, _top - nparams, outres, SQFalse)) {
                  Pop(nparams);
                  return true;
            }
      }
      Pop(nparams);
      return false;
}

void SQVM::Remove(SQInteger n) {
      n = (n >= 0)?n + _stackbase - 1:_top + n;
      for(SQInteger i = n; i < _top; i++){
            _stack[i] = _stack[i+1];
      }
      _stack[_top] = _null_;
      _top--;
}

void SQVM::Pop() {
      _stack[--_top] = _null_;
}

void SQVM::Pop(SQInteger n) {
      for(SQInteger i = 0; i < n; i++){
            _stack[--_top] = _null_;
      }
}

void SQVM::Push(const SQObjectPtr &o) { _stack[_top++] = o; }
SQObjectPtr &SQVM::Top() { return _stack[_top-1]; }
SQObjectPtr &SQVM::PopGet() { return _stack[--_top]; }
SQObjectPtr &SQVM::GetUp(SQInteger n) { return _stack[_top+n]; }
SQObjectPtr &SQVM::GetAt(SQInteger n) { return _stack[n]; }

#ifdef _DEBUG_DUMP
void SQVM::dumpstack(SQInteger stackbase,bool dumpall)
{
      SQInteger size=dumpall?_stack.size():_top;
      SQInteger n=0;
      scprintf(_SC("\n>>>>stack dump<<<<\n"));
      CallInfo &ci=_callsstack[_callsstacksize-1];
      scprintf(_SC("IP: %p\n"),ci._ip);
      scprintf(_SC("prev stack base: %d\n"),ci._prevstkbase);
      scprintf(_SC("prev top: %d\n"),ci._prevtop);
      for(SQInteger i=0;i<size;i++){
            SQObjectPtr &obj=_stack[i];
            if(stackbase==i)scprintf(_SC(">"));else scprintf(_SC(" "));
            scprintf(_SC("[%d]:"),n);
            switch(type(obj)){
            case OT_FLOAT:                scprintf(_SC("FLOAT %.3f"),_float(obj));break;
            case OT_INTEGER:        scprintf(_SC("INTEGER %d"),_integer(obj));break;
            case OT_BOOL:                 scprintf(_SC("BOOL %s"),_integer(obj)?"true":"false");break;
            case OT_STRING:               scprintf(_SC("STRING %s"),_stringval(obj));break;
            case OT_NULL:                 scprintf(_SC("NULL"));  break;
            case OT_TABLE:                scprintf(_SC("TABLE %p[%p]"),_table(obj),_table(obj)->_delegate);break;
            case OT_ARRAY:                scprintf(_SC("ARRAY %p"),_array(obj));break;
            case OT_CLOSURE:        scprintf(_SC("CLOSURE [%p]"),_closure(obj));break;
            case OT_NATIVECLOSURE:  scprintf(_SC("NATIVECLOSURE"));break;
            case OT_USERDATA:       scprintf(_SC("USERDATA %p[%p]"),_userdataval(obj),_userdata(obj)->_delegate);break;
            case OT_GENERATOR:            scprintf(_SC("GENERATOR %p"),_generator(obj));break;
            case OT_THREAD:               scprintf(_SC("THREAD [%p]"),_thread(obj));break;
            case OT_USERPOINTER:    scprintf(_SC("USERPOINTER %p"),_userpointer(obj));break;
            case OT_CLASS:                scprintf(_SC("CLASS %p"),_class(obj));break;
            case OT_INSTANCE:       scprintf(_SC("INSTANCE %p"),_instance(obj));break;
            case OT_WEAKREF:        scprintf(_SC("WEAKERF %p"),_weakref(obj));break;
            default:
                  assert(0);
                  break;
            };
            scprintf(_SC("\n"));
            ++n;
      }
}



#endif

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