Diff: squirrel/sqvm.cpp

Revision:

0:97a4f8cc534c

Child:

1:8a2835ae5c5d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/squirrel/sqvm.cpp	Tue Dec 16 10:20:34 2014 +0000
@@ -0,0 +1,1724 @@
+/*
+	see copyright notice in squirrel.h
+*/
+#include "sqpcheader.h"
+#include <math.h>
+#include <stdlib.h>
+#include "sqopcodes.h"
+#include "sqvm.h"
+#include "sqfuncproto.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])
+
+bool SQVM::BW_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
+{
+	SQInteger res;
+	if((type(o1)|type(o2)) == OT_INTEGER)
+	{
+		SQInteger i1 = _integer(o1), i2 = _integer(o2);
+		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;
+}
+
+#define _ARITH_(op,trg,o1,o2) \
+{ \
+	SQInteger tmask = type(o1)|type(o2); \
+	switch(tmask) { \
+		case OT_INTEGER: trg = _integer(o1) op _integer(o2);break; \
+		case (OT_FLOAT|OT_INTEGER): \
+		case (OT_FLOAT): trg = tofloat(o1) op tofloat(o2); break;\
+		default: _GUARD(ARITH_OP((#op)[0],trg,o1,o2)); break;\
+	} \
+}
+
+#define _ARITH_NOZERO(op,trg,o1,o2,err) \
+{ \
+	SQInteger tmask = type(o1)|type(o2); \
+	switch(tmask) { \
+		case OT_INTEGER: { SQInteger i2 = _integer(o2); if(i2 == 0) { Raise_Error(err); SQ_THROW(); } trg = _integer(o1) op i2; } break;\
+		case (OT_FLOAT|OT_INTEGER): \
+		case (OT_FLOAT): trg = tofloat(o1) op tofloat(o2); break;\
+		default: _GUARD(ARITH_OP((#op)[0],trg,o1,o2)); break;\
+	} \
+}
+
+bool SQVM::ARITH_OP(SQUnsignedInteger op,SQObjectPtr &trg,const SQObjectPtr &o1,const SQObjectPtr &o2)
+{
+	SQInteger tmask = type(o1)|type(o2);
+	switch(tmask) {
+		case 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; }
+			break;
+		case (OT_FLOAT|OT_INTEGER):
+		case (OT_FLOAT):{
+			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; }
+			break;
+		default:
+			if(op == '+' &&	(tmask & _RT_STRING)){
+				if(!StringCat(o1, o2, trg)) return false;
+			}
+			else if(!ArithMetaMethod(op,o1,o2,trg)) { 
+				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;
+	_nmetamethodscall = 0;
+	_lasterror.Null();
+	_errorhandler.Null();
+	_debughook = false;
+	_debughook_native = NULL;
+	_debughook_closure.Null();
+	_openouters = NULL;
+	ci = NULL;
+	INIT_CHAIN();ADD_TO_CHAIN(&_ss(this)->_gc_chain,this);
+}
+
+void SQVM::Finalize()
+{
+	if(_openouters) CloseOuters(&_stack._vals[0]);
+	_roottable.Null();
+	_lasterror.Null();
+	_errorhandler.Null();
+	_debughook = false;
+	_debughook_native = NULL;
+	_debughook_closure.Null();
+	temp_reg.Null();
+	_callstackdata.resize(0);
+	SQInteger size=_stack.size();
+	for(SQInteger i=0;i<size;i++)
+		_stack[i].Null();
+}
+
+SQVM::~SQVM()
+{
+	Finalize();
+	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) {
+		
+		SQObjectPtr closure;
+		if(_delegable(o1)->GetMetaMethod(this, mm, closure)) {
+			Push(o1);Push(o2);
+			return CallMetaMethod(closure,mm,2,dest);
+		}
+	}
+	Raise_Error(_SC("arith op %c on between '%s' and '%s'"),op,GetTypeName(o1),GetTypeName(o2)); 
+	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) {
+			SQObjectPtr closure;
+			if(_delegable(o)->GetMetaMethod(this, MT_UNM, closure)) {
+				Push(o);
+				if(!CallMetaMethod(closure, MT_UNM, 1, temp_reg)) return false;
+				_Swap(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)
+{
+	SQObjectType t1 = type(o1), t2 = type(o2);
+	if(t1 == t2) {
+		if(_rawval(o1) == _rawval(o2))_RET_SUCCEED(0);
+		SQObjectPtr res;
+		switch(t1){
+		case OT_STRING:
+			_RET_SUCCEED(scstrcmp(_stringval(o1),_stringval(o2)));
+		case OT_INTEGER:
+			_RET_SUCCEED((_integer(o1)<_integer(o2))?-1:1);
+		case OT_FLOAT:
+			_RET_SUCCEED((_float(o1)<_float(o2))?-1:1);
+		case OT_TABLE:
+		case OT_USERDATA:
+		case OT_INSTANCE:
+			if(_delegable(o1)->_delegate) {
+				SQObjectPtr closure;
+				if(_delegable(o1)->GetMetaMethod(this, MT_CMP, closure)) {
+					Push(o1);Push(o2);
+					if(CallMetaMethod(closure,MT_CMP,2,res)) {
+						if(type(res) != OT_INTEGER) {
+							Raise_Error(_SC("_cmp must return an integer"));
+							return false;
+						}
+						_RET_SUCCEED(_integer(res))
+					}
+					return false;
+				}
+			}
+			//continues through (no break needed)
+		default: 
+			_RET_SUCCEED( _userpointer(o1) < _userpointer(o2)?-1:1 );
+		}
+		assert(0);
+		//if(type(res)!=OT_INTEGER) { Raise_CompareError(o1,o2); return false; }
+		//	_RET_SUCCEED(_integer(res));
+		
+	}
+	else{
+		if(sq_isnumeric(o1) && sq_isnumeric(o2)){
+			if((t1==OT_INTEGER) && (t2==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(t1==OT_NULL) {_RET_SUCCEED(-1);}
+		else if(t2==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); return true;
+			case CMP_GE: res = (r >= 0); return true;
+			case CMP_L: res = (r < 0); return true;
+			case CMP_LE: res = (r <= 0); return true;
+			case CMP_3W: res = r; return true;
+		}
+		assert(0);
+	}
+	return false;
+}
+
+bool SQVM::ToString(const SQObjectPtr &o,SQObjectPtr &res)
+{
+	switch(type(o)) {
+	case OT_STRING:
+		res = o;
+		return true;
+	case OT_FLOAT:
+		scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_SC("%g"),_float(o));
+		break;
+	case OT_INTEGER:
+		scsprintf(_sp(rsl(NUMBER_MAX_CHAR+1)),_PRINT_INT_FMT,_integer(o));
+		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) {
+			SQObjectPtr closure;
+			if(_delegable(o)->GetMetaMethod(this, MT_TOSTRING, closure)) {
+				Push(o);
+				if(CallMetaMethod(closure,MT_TOSTRING,1,res)) {;
+					if(type(res) == OT_STRING)
+						return true;
+				} 
+				else {
+					return false;
+				}
+			}
+		}
+	default:
+		scsprintf(_sp(rsl(sizeof(void*)+20)),_SC("(%s : 0x%p)"),GetTypeName(o),(void*)_rawval(o));
+	}
+	res = SQString::Create(_ss(this),_spval);
+	return true;
+}
+
+
+bool SQVM::StringCat(const SQObjectPtr &str,const SQObjectPtr &obj,SQObjectPtr &dest)
+{
+	SQObjectPtr a, b;
+	if(!ToString(str, a)) return false;
+	if(!ToString(obj, b)) return false;
+	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;
+}
+
+bool SQVM::TypeOf(const SQObjectPtr &obj1,SQObjectPtr &dest)
+{
+	if(is_delegable(obj1) && _delegable(obj1)->_delegate) {
+		SQObjectPtr closure;
+		if(_delegable(obj1)->GetMetaMethod(this, MT_TYPEOF, closure)) {
+			Push(obj1);
+			return CallMetaMethod(closure,MT_TYPEOF,1,dest);
+		}
+	}
+	dest = SQString::Create(_ss(this),GetTypeName(obj1));
+	return true;
+}
+
+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;
+		_debughook_native = friendvm->_debughook_native;
+		_debughook_closure = friendvm->_debughook_closure;
+	}
+	
+	sq_base_register(this);
+	return true;
+}
+
+
+bool SQVM::StartCall(SQClosure *closure,SQInteger target,SQInteger args,SQInteger stackbase,bool tailcall)
+{
+	SQFunctionProto *func = closure->_function;
+
+	SQInteger paramssize = func->_nparameters;
+	const SQInteger newtop = stackbase + func->_stacksize;
+	SQInteger nargs = args;
+	if(func->_varparams)
+	{
+		paramssize--;
+		if (nargs < paramssize) {
+			Raise_Error(_SC("wrong number of parameters"));
+			return false;
+		}
+
+		//dumpstack(stackbase);
+		SQInteger nvargs = nargs - paramssize;
+		SQArray *arr = SQArray::Create(_ss(this),nvargs);
+		SQInteger pbase = stackbase+paramssize;
+		for(SQInteger n = 0; n < nvargs; n++) {
+			arr->_values[n] = _stack._vals[pbase];
+			_stack._vals[pbase].Null();
+			pbase++;
+
+		}
+		_stack._vals[stackbase+paramssize] = arr;
+		//dumpstack(stackbase);
+	}
+	else 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 {
+			Raise_Error(_SC("wrong number of parameters"));
+			return false;
+		}
+	}
+
+	if(closure->_env) {
+		_stack._vals[stackbase] = closure->_env->_obj;
+	}
+
+	if(!EnterFrame(stackbase, newtop, tailcall)) return false;
+
+	ci->_closure  = closure;
+	ci->_literals = func->_literals;
+	ci->_ip       = func->_instructions;
+	ci->_target   = (SQInt32)target;
+
+	if (_debughook) {
+		CallDebugHook(_SC('c'));
+	}
+
+	if (closure->_function->_bgenerator) {
+		SQFunctionProto *f = closure->_function;
+		SQGenerator *gen = SQGenerator::Create(_ss(this), closure);
+		if(!gen->Yield(this,f->_stacksize))
+			return false;
+		SQObjectPtr temp;
+		Return(1, target, temp);
+		STK(target) = gen;
+	}
+
+
+	return true;
+}
+
+bool SQVM::Return(SQInteger _arg0, SQInteger _arg1, SQObjectPtr &retval)
+{
+	SQBool    _isroot      = ci->_root;
+	SQInteger callerbase   = _stackbase - ci->_prevstkbase;
+
+	if (_debughook) {
+		for(SQInteger i=0; i<ci->_ncalls; i++) {
+			CallDebugHook(_SC('r'));
+		}
+	}
+
+	SQObjectPtr *dest;
+	if (_isroot) {
+		dest = &(retval);
+	} else if (ci->_target == -1) {
+		dest = NULL;
+	} else {
+		dest = &_stack._vals[callerbase + ci->_target];
+	}
+	if (dest) {
+		if(_arg0 != 0xFF) {
+			*dest = _stack._vals[_stackbase+_arg1];
+		}
+		else {
+			dest->Null();
+		}
+		//*dest = (_arg0 != 0xFF) ? _stack._vals[_stackbase+_arg1] : _null_;
+	}
+	LeaveFrame();
+	return _isroot ? true : false;
+}
+
+#define _RET_ON_FAIL(exp) { if(!exp) return false; }
+
+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,SQInteger selfidx)
+{
+	SQObjectPtr tmp, tself = self, tkey = key;
+	if (!Get(tself, tkey, tmp, false, selfidx)) { return false; }
+	_RET_ON_FAIL(ARITH_OP( op , target, tmp, incr))
+	if (!Set(tself, tkey, target,selfidx)) { return false; }
+	if (postfix) target = tmp;
+	return true;
+}
+
+#define arg0 (_i_._arg0)
+#define sarg0 ((SQInteger)*((signed char *)&_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;
+}
+
+
+#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;
+			SQObjectPtr closure;
+			if(_delegable(o1)->GetMetaMethod(this, MT_NEXTI, closure)) {
+				Push(o1);
+				Push(o4);
+				if(CallMetaMethod(closure, MT_NEXTI, 2, itr)) {
+					o4 = o2 = itr;
+					if(type(itr) == OT_NULL) _FINISH(exitpos);
+					if(!Get(o1, itr, o3, false, DONT_FALL_BACK)) {
+						Raise_Error(_SC("_nexti returned an invalid idx")); // cloud be changed
+						return false;
+					}
+					_FINISH(1);
+				}
+				else {
+					return false;
+				}
+			}
+			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, o3);
+			_FINISH(0);
+		}
+	default: 
+		Raise_Error(_SC("cannot iterate %s"), GetTypeName(o1));
+	}
+	return false; //cannot be hit(just to avoid warnings)
+}
+
+#define COND_LITERAL (arg3!=0?ci->_literals[arg1]:STK(arg1))
+
+#define SQ_THROW() { goto exception_trap; }
+
+#define _GUARD(exp) { if(!exp) { SQ_THROW();} }
+
+bool SQVM::CLOSURE_OP(SQObjectPtr &target, SQFunctionProto *func)
+{
+	SQInteger nouters;
+	SQClosure *closure = SQClosure::Create(_ss(this), func);
+	if((nouters = func->_noutervalues)) {
+		for(SQInteger i = 0; i<nouters; i++) {
+			SQOuterVar &v = func->_outervalues[i];
+			switch(v._type){
+			case otLOCAL:
+				FindOuter(closure->_outervalues[i], &STK(_integer(v._src)));
+				break;
+			case otOUTER:
+				closure->_outervalues[i] = _closure(ci->_closure)->_outervalues[_integer(v._src)];
+				break;
+			}
+		}
+	}
+	SQInteger ndefparams;
+	if((ndefparams = func->_ndefaultparams)) {
+		for(SQInteger i = 0; i < ndefparams; i++) {
+			SQInteger spos = func->_defaultparams[i];
+			closure->_defaultparams[i] = _stack._vals[_stackbase + spos];
+		}
+	}
+	target = closure;
+	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(const SQObjectPtr &o1,const SQObjectPtr &o2,bool &res)
+{
+	if(type(o1) == type(o2)) {
+		res = (_rawval(o1) == _rawval(o2));
+	}
+	else {
+		if(sq_isnumeric(o1) && sq_isnumeric(o2)) {
+			res = (tofloat(o1) == tofloat(o2));
+		}
+		else {
+			res = false;
+		}
+	}
+	return true;
+}
+
+bool SQVM::IsFalse(SQObjectPtr &o)
+{
+	if(((type(o) & SQOBJECT_CANBEFALSE) 
+		&& ( ((type(o) == OT_FLOAT) && (_float(o) == SQFloat(0.0))) ))
+#if !defined(SQUSEDOUBLE) || (defined(SQUSEDOUBLE) && defined(_SQ64))
+		|| (_integer(o) == 0) )  //OT_NULL|OT_INTEGER|OT_BOOL
+#else
+		|| (((type(o) != OT_FLOAT) && (_integer(o) == 0))) )  //OT_NULL|OT_INTEGER|OT_BOOL
+#endif
+	{
+		return true;
+	}
+	return false;
+}
+
+bool SQVM::Execute(SQObjectPtr &closure, 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;
+	CallInfo *prevci = ci;
+		
+	switch(et) {
+		case ET_CALL: {
+			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(ci == prevci) {
+				outres = STK(_top-nargs);
+				return true;
+			}
+			ci->_root = SQTrue;
+					  }
+			break;
+		case ET_RESUME_GENERATOR: _generator(closure)->Resume(this, outres); ci->_root = SQTrue; traps += ci->_etraps; break;
+		case ET_RESUME_VM:
+		case ET_RESUME_THROW_VM:
+			traps = _suspended_traps;
+			ci->_root = _suspended_root;
+			_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 (_debughook) CallDebugHook(_SC('l'),arg1); continue;
+			case _OP_LOAD: TARGET = ci->_literals[arg1]; continue;
+			case _OP_LOADINT: 
+#ifndef _SQ64
+				TARGET = (SQInteger)arg1; continue;
+#else
+				TARGET = (SQInteger)((SQUnsignedInteger32)arg1); continue;
+#endif
+			case _OP_LOADFLOAT: TARGET = *((SQFloat *)&arg1); continue;
+			case _OP_DLOAD: TARGET = ci->_literals[arg1]; STK(arg2) = ci->_literals[arg3];continue;
+			case _OP_TAILCALL:{
+				SQObjectPtr &t = STK(arg1);
+				if (type(t) == OT_CLOSURE 
+					&& (!_closure(t)->_function->_bgenerator)){
+					SQObjectPtr clo = t;
+					if(_openouters) CloseOuters(&(_stack._vals[_stackbase]));
+					for (SQInteger i = 0; i < arg3; i++) STK(i) = STK(arg2 + i);
+					_GUARD(StartCall(_closure(clo), ci->_target, arg3, _stackbase, true));
+					continue;
+				}
+							  }
+			case _OP_CALL: {
+					SQObjectPtr clo = STK(arg1);
+					switch (type(clo)) {
+					case OT_CLOSURE:
+						_GUARD(StartCall(_closure(clo), sarg0, arg3, _stackbase+arg2, false));
+						continue;
+					case OT_NATIVECLOSURE: {
+						bool suspend;
+						_GUARD(CallNative(_nativeclosure(clo), arg3, _stackbase+arg2, clo,suspend));
+						if(suspend){
+							_suspended = SQTrue;
+							_suspended_target = sarg0;
+							_suspended_root = ci->_root;
+							_suspended_traps = traps;
+							outres = clo;
+							return true;
+						}
+						if(sarg0 != -1) {
+							STK(arg0) = clo;
+						}
+										   }
+						continue;
+					case OT_CLASS:{
+						SQObjectPtr inst;
+						_GUARD(CreateClassInstance(_class(clo),inst,clo));
+						if(sarg0 != -1) {
+							STK(arg0) = inst;
+						}
+						SQInteger stkbase;
+						switch(type(clo)) {
+							case OT_CLOSURE:
+								stkbase = _stackbase+arg2;
+								_stack._vals[stkbase] = inst;
+								_GUARD(StartCall(_closure(clo), -1, arg3, stkbase, false));
+								break;
+							case OT_NATIVECLOSURE:
+								bool suspend;
+								stkbase = _stackbase+arg2;
+								_stack._vals[stkbase] = inst;
+								_GUARD(CallNative(_nativeclosure(clo), arg3, stkbase, clo,suspend));
+								break;
+							default: break; //shutup GCC 4.x
+						}
+						}
+						break;
+					case OT_TABLE:
+					case OT_USERDATA:
+					case OT_INSTANCE:{
+						SQObjectPtr closure;
+						if(_delegable(clo)->_delegate && _delegable(clo)->GetMetaMethod(this,MT_CALL,closure)) {
+							Push(clo);
+							for (SQInteger i = 0; i < arg3; i++) Push(STK(arg2 + i));
+							if(!CallMetaMethod(closure, MT_CALL, arg3+1, clo)) SQ_THROW();
+							if(sarg0 != -1) {
+								STK(arg0) = 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,arg2)) {
+						SQ_THROW();
+					}
+					STK(arg3) = o;
+					_Swap(TARGET,temp_reg);//TARGET = temp_reg;
+				}
+				continue;
+			case _OP_GETK:
+				if (!Get(STK(arg2), ci->_literals[arg1], temp_reg, false,arg2)) { SQ_THROW();}
+				_Swap(TARGET,temp_reg);//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 != 0xFF) 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),arg1)) { SQ_THROW(); }
+				if (arg0 != 0xFF) TARGET = STK(arg3);
+				continue;
+			case _OP_GET:
+				if (!Get(STK(arg1), STK(arg2), temp_reg, false,arg1)) { SQ_THROW(); }
+				_Swap(TARGET,temp_reg);//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_ADD: _ARITH_(+,TARGET,STK(arg2),STK(arg1)); continue;
+			case _OP_SUB: _ARITH_(-,TARGET,STK(arg2),STK(arg1)); continue;
+			case _OP_MUL: _ARITH_(*,TARGET,STK(arg2),STK(arg1)); continue;
+			case _OP_DIV: _ARITH_NOZERO(/,TARGET,STK(arg2),STK(arg1),_SC("division by zero")); continue;
+			case _OP_MOD: ARITH_OP('%',TARGET,STK(arg2),STK(arg1)); 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;
+					_Swap(outres,temp_reg);
+					return true;
+				}
+				continue;
+			case _OP_LOADNULLS:{ for(SQInt32 n=0; n < arg1; n++) STK(arg0+n).Null(); }continue;
+			case _OP_LOADROOT:	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_JCMP: 
+				_GUARD(CMP_OP((CmpOP)arg3,STK(arg2),STK(arg0),temp_reg));
+				if(IsFalse(temp_reg)) ci->_ip+=(sarg1);
+				continue;
+			case _OP_JZ: if(IsFalse(STK(arg0))) ci->_ip+=(sarg1); continue;
+			case _OP_GETOUTER: {
+				SQClosure *cur_cls = _closure(ci->_closure);
+				SQOuter *otr = _outer(cur_cls->_outervalues[arg1]);
+				TARGET = *(otr->_valptr);
+				}
+			continue;
+			case _OP_SETOUTER: {
+				SQClosure *cur_cls = _closure(ci->_closure);
+				SQOuter   *otr = _outer(cur_cls->_outervalues[arg1]);
+				*(otr->_valptr) = STK(arg2);
+				if(arg0 != 0xFF) {
+					TARGET = STK(arg2);
+				}
+				}
+			continue;
+			case _OP_NEWOBJ: 
+				switch(arg3) {
+					case NOT_TABLE: TARGET = SQTable::Create(_ss(this), arg1); continue;
+					case NOT_ARRAY: TARGET = SQArray::Create(_ss(this), 0); _array(TARGET)->Reserve(arg1); continue;
+					case NOT_CLASS: _GUARD(CLASS_OP(TARGET,arg1,arg2)); continue;
+					default: assert(0); continue;
+				}
+			case _OP_APPENDARRAY: 
+				{
+					SQObject val;
+					val._unVal.raw = 0;
+				switch(arg2) {
+				case AAT_STACK:
+					val = STK(arg1); break;
+				case AAT_LITERAL:
+					val = ci->_literals[arg1]; break;
+				case AAT_INT:
+					val._type = OT_INTEGER;
+#ifndef _SQ64
+					val._unVal.nInteger = (SQInteger)arg1; 
+#else
+					val._unVal.nInteger = (SQInteger)((SQUnsignedInteger32)arg1);
+#endif
+					break;
+				case AAT_FLOAT:
+					val._type = OT_FLOAT;
+					val._unVal.fFloat = *((SQFloat *)&arg1);
+					break;
+				case AAT_BOOL:
+					val._type = OT_BOOL;
+					val._unVal.nInteger = arg1;
+					break;
+				default: assert(0); break;
+
+				}
+				_array(STK(arg0))->Append(val);	continue;
+				}
+			case _OP_COMPARITH: {
+				SQInteger selfidx = (((SQUnsignedInteger)arg1&0xFFFF0000)>>16);
+				_GUARD(DerefInc(arg3, TARGET, STK(selfidx), STK(arg2), STK(arg1&0x0000FFFF), false, selfidx)); 
+								}
+				continue;
+			case _OP_INC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, false, arg1));} continue;
+			case _OP_INCL: {
+				SQObjectPtr &a = STK(arg1);
+				if(type(a) == OT_INTEGER) {
+					a._unVal.nInteger = _integer(a) + sarg3;
+				}
+				else {
+					SQObjectPtr o(sarg3); //_GUARD(LOCAL_INC('+',TARGET, STK(arg1), o));
+					_ARITH_(+,a,a,o);
+				}
+						   } continue;
+			case _OP_PINC: {SQObjectPtr o(sarg3); _GUARD(DerefInc('+',TARGET, STK(arg1), STK(arg2), o, true, arg1));} continue;
+			case _OP_PINCL:	{
+				SQObjectPtr &a = STK(arg1);
+				if(type(a) == OT_INTEGER) {
+					TARGET = a;
+					a._unVal.nInteger = _integer(a) + sarg3;
+				}
+				else {
+					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,DONT_FALL_BACK)?true:false;continue;
+			case _OP_INSTANCEOF: 
+				if(type(STK(arg1)) != OT_CLASS)
+				{Raise_Error(_SC("cannot apply instanceof between a %s and a %s"),GetTypeName(STK(arg1)),GetTypeName(STK(arg2))); SQ_THROW();}
+				TARGET = (type(STK(arg2)) == OT_INSTANCE) ? (_instance(STK(arg2))->InstanceOf(_class(STK(arg1)))?true:false) : 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)); 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;
+				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,arg2));
+					traps -= ci->_etraps;
+					if(sarg1 != MAX_FUNC_STACKSIZE) _Swap(STK(arg1),temp_reg);//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, TARGET));
+				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_CLONE: _GUARD(Clone(STK(arg1), TARGET)); continue;
+			case _OP_TYPEOF: _GUARD(TypeOf(STK(arg1), TARGET)) continue;
+			case _OP_PUSHTRAP:{
+				SQInstruction *_iv = _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_NEWSLOTA:
+				_GUARD(NewSlotA(STK(arg1),STK(arg2),STK(arg3),(arg0&NEW_SLOT_ATTRIBUTES_FLAG) ? STK(arg2-1) : SQObjectPtr(),(arg0&NEW_SLOT_STATIC_FLAG)?true:false,false));
+				continue;
+			case _OP_GETBASE:{
+				SQClosure *clo = _closure(ci->_closure);
+				if(clo->_base) {
+					TARGET = clo->_base;
+				}
+				else {
+					TARGET.Null();
+				}
+				continue;
+			}
+			case _OP_CLOSE:
+				if(_openouters) CloseOuters(&(STK(arg1)));
+				continue;
+			}
+			
+		}
+	}
+exception_trap:
+	{
+		SQObjectPtr currerror = _lasterror;
+//		dumpstack(_stackbase);
+//		SQInteger n = 0;
+		SQInteger last_top = _top;
+		
+		if(_ss(this)->_notifyallexceptions || (!traps && raiseerror)) CallErrorHandler(currerror);
+
+		while( ci ) {
+			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--;
+				while(last_top >= _top) _stack._vals[last_top--].Null();
+				goto exception_restore;
+			}
+			else if (_debughook) { 
+					//notify debugger of a "return"
+					//even if it really an exception unwinding the stack
+					for(SQInteger i = 0; i < ci->_ncalls; i++) {
+						CallDebugHook(_SC('r'));
+					}
+			}
+			if(ci->_generator) ci->_generator->Kill();
+			bool mustbreak = ci && ci->_root;
+			LeaveFrame();
+			if(mustbreak) break;
+		}
+						
+		_lasterror = currerror;
+		return false;
+	}
+	assert(0);
+}
+
+bool SQVM::CreateClassInstance(SQClass *theclass, SQObjectPtr &inst, SQObjectPtr &constructor)
+{
+	inst = theclass->CreateInstance();
+	if(!theclass->GetConstructor(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)
+{
+	_debughook = false;
+	SQFunctionProto *func=_closure(ci->_closure)->_function;
+	if(_debughook_native) {
+		const SQChar *src = type(func->_sourcename) == OT_STRING?_stringval(func->_sourcename):NULL;
+		const SQChar *fname = type(func->_name) == OT_STRING?_stringval(func->_name):NULL;
+		SQInteger line = forcedline?forcedline:func->GetLine(ci->_ip);
+		_debughook_native(this,type,src,line,fname);
+	}
+	else {
+		SQObjectPtr temp_reg;
+		SQInteger nparams=5;
+		Push(_roottable); Push(type); Push(func->_sourcename); Push(forcedline?forcedline:func->GetLine(ci->_ip)); Push(func->_name);
+		Call(_debughook_closure,nparams,_top-nparams,temp_reg,SQFalse);
+		Pop(nparams);
+	}
+	_debughook = true;
+}
+
+bool SQVM::CallNative(SQNativeClosure *nclosure, SQInteger nargs, SQInteger newbase, SQObjectPtr &retval, bool &suspend)
+{
+	SQInteger nparamscheck = nclosure->_nparamscheck;
+	SQInteger newtop = newbase + nargs + nclosure->_noutervalues;
+	
+	if (_nnativecalls + 1 > MAX_NATIVE_CALLS) {
+		Raise_Error(_SC("Native stack overflow"));
+		return false;
+	}
+
+	if(nparamscheck && (((nparamscheck > 0) && (nparamscheck != nargs)) ||
+		((nparamscheck < 0) && (nargs < (-nparamscheck)))))
+	{
+		Raise_Error(_SC("wrong number of parameters"));
+		return false;
+	}
+
+	SQInteger tcs;
+	SQIntVec &tc = nclosure->_typecheck;
+	if((tcs = tc.size())) {
+		for(SQInteger i = 0; i < nargs && i < tcs; i++) {
+			if((tc._vals[i] != -1) && !(type(_stack._vals[newbase+i]) & tc._vals[i])) {
+				Raise_ParamTypeError(i,tc._vals[i],type(_stack._vals[newbase+i]));
+				return false;
+			}
+		}
+	}
+
+	if(!EnterFrame(newbase, newtop, false)) return false;
+	ci->_closure  = nclosure;
+
+	SQInteger outers = nclosure->_noutervalues;
+	for (SQInteger i = 0; i < outers; i++) {
+		_stack._vals[newbase+nargs+i] = nclosure->_outervalues[i];
+	}
+	if(nclosure->_env) {
+		_stack._vals[newbase] = nclosure->_env->_obj;
+	}
+
+	_nnativecalls++;
+	SQInteger ret = (nclosure->_function)(this);
+	_nnativecalls--;
+
+	suspend = false;
+	if (ret == SQ_SUSPEND_FLAG) {
+		suspend = true;
+	}
+	else if (ret < 0) {
+		LeaveFrame();
+		Raise_Error(_lasterror);
+		return false;
+	}
+	if(ret) {
+		retval = _stack._vals[_top-1];
+	}
+	else {
+		retval.Null();
+	}
+	//retval = ret ? _stack._vals[_top-1] : _null_;
+	LeaveFrame();
+	return true;
+}
+
+#define FALLBACK_OK			0
+#define FALLBACK_NO_MATCH	1
+#define FALLBACK_ERROR		2
+
+bool SQVM::Get(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest,bool raw, SQInteger selfidx)
+{
+	switch(type(self)){
+	case OT_TABLE:
+		if(_table(self)->Get(key,dest))return true;
+		break;
+	case OT_ARRAY:
+		if(sq_isnumeric(key)) { if(_array(self)->Get(tointeger(key),dest)) { return true; } Raise_IdxError(key); return false; }
+		break;
+	case OT_INSTANCE:
+		if(_instance(self)->Get(key,dest)) return true;
+		break;
+	case OT_CLASS: 
+		if(_class(self)->Get(key,dest)) return true;
+		break;
+	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;
+			}
+			Raise_IdxError(key);
+			return false;
+		}
+		break;
+	default:break; //shut up compiler
+	}
+	if(!raw) {
+		switch(FallBackGet(self,key,dest)) {
+			case FALLBACK_OK: return true; //okie
+			case FALLBACK_NO_MATCH: break; //keep falling back
+			case FALLBACK_ERROR: return false; // the metamethod failed
+		}
+		if(InvokeDefaultDelegate(self,key,dest)) {
+			return true;
+		}
+	}
+//#ifdef ROOT_FALLBACK
+	if(selfidx == 0) {
+		if(_table(_roottable)->Get(key,dest)) return true;
+	}
+//#endif
+	Raise_IdxError(key);
+	return false;
+}
+
+bool SQVM::InvokeDefaultDelegate(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest)
+{
+	SQTable *ddel = NULL;
+	switch(type(self)) {
+		case OT_CLASS: ddel = _class_ddel; break;
+		case OT_TABLE: ddel = _table_ddel; break;
+		case OT_ARRAY: ddel = _array_ddel; break;
+		case OT_STRING: ddel = _string_ddel; break;
+		case OT_INSTANCE: ddel = _instance_ddel; break;
+		case OT_INTEGER:case OT_FLOAT:case OT_BOOL: ddel = _number_ddel; break;
+		case OT_GENERATOR: ddel = _generator_ddel; break;
+		case OT_CLOSURE: case OT_NATIVECLOSURE:	ddel = _closure_ddel; break;
+		case OT_THREAD: ddel = _thread_ddel; break;
+		case OT_WEAKREF: ddel = _weakref_ddel; break;
+		default: return false;
+	}
+	return  ddel->Get(key,dest);
+}
+
+
+SQInteger SQVM::FallBackGet(const SQObjectPtr &self,const SQObjectPtr &key,SQObjectPtr &dest)
+{
+	switch(type(self)){
+	case OT_TABLE:
+	case OT_USERDATA:
+        //delegation
+		if(_delegable(self)->_delegate) {
+			if(Get(SQObjectPtr(_delegable(self)->_delegate),key,dest,false,DONT_FALL_BACK)) return FALLBACK_OK;	
+		}
+		else {
+			return FALLBACK_NO_MATCH;
+		}
+		//go through
+	case OT_INSTANCE: {
+		SQObjectPtr closure;
+		if(_delegable(self)->GetMetaMethod(this, MT_GET, closure)) {
+			Push(self);Push(key);
+			_nmetamethodscall++;
+			AutoDec ad(&_nmetamethodscall);
+			if(Call(closure, 2, _top - 2, dest, SQFalse)) {
+				Pop(2);
+				return FALLBACK_OK;
+			}
+			else {
+				Pop(2);
+				if(type(_lasterror) != OT_NULL) { //NULL means "clean failure" (not found)
+					return FALLBACK_ERROR;
+				}
+			}
+		}
+					  }
+		break;
+	default: break;//shutup GCC 4.x
+	}
+	// no metamethod or no fallback type
+	return FALLBACK_NO_MATCH;
+}
+
+bool SQVM::Set(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,SQInteger selfidx)
+{
+	switch(type(self)){
+	case OT_TABLE:
+		if(_table(self)->Set(key,val)) return true;
+		break;
+	case OT_INSTANCE:
+		if(_instance(self)->Set(key,val)) return true;
+		break;
+	case OT_ARRAY:
+		if(!sq_isnumeric(key)) { Raise_Error(_SC("indexing %s with %s"),GetTypeName(self),GetTypeName(key)); return false; }
+		if(!_array(self)->Set(tointeger(key),val)) {
+			Raise_IdxError(key);
+			return false;
+		}
+		return true;
+	default:
+		Raise_Error(_SC("trying to set '%s'"),GetTypeName(self));
+		return false;
+	}
+
+	switch(FallBackSet(self,key,val)) {
+		case FALLBACK_OK: return true; //okie
+		case FALLBACK_NO_MATCH: break; //keep falling back
+		case FALLBACK_ERROR: return false; // the metamethod failed
+	}
+	if(selfidx == 0) {
+		if(_table(_roottable)->Set(key,val))
+			return true;
+	}
+	Raise_IdxError(key);
+	return false;
+}
+
+SQInteger SQVM::FallBackSet(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val)
+{
+	switch(type(self)) {
+	case OT_TABLE:
+		if(_table(self)->_delegate) {
+			if(Set(_table(self)->_delegate,key,val,DONT_FALL_BACK))	return FALLBACK_OK;
+		}
+		//keps on going
+	case OT_INSTANCE:
+	case OT_USERDATA:{
+		SQObjectPtr closure;
+		SQObjectPtr t;
+		if(_delegable(self)->GetMetaMethod(this, MT_SET, closure)) {
+			Push(self);Push(key);Push(val);
+			_nmetamethodscall++;
+			AutoDec ad(&_nmetamethodscall);
+			if(Call(closure, 3, _top - 3, t, SQFalse)) {
+				Pop(3);
+				return FALLBACK_OK;
+			}
+			else {
+				if(type(_lasterror) != OT_NULL) { //NULL means "clean failure" (not found)
+					//error
+					Pop(3);
+					return FALLBACK_ERROR;
+				}
+			}
+		}
+					 }
+		break;
+		default: break;//shutup GCC 4.x
+	}
+	// no metamethod or no fallback type
+	return FALLBACK_NO_MATCH;
+}
+
+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:
+		SQObjectPtr closure;
+		if(_delegable(newobj)->_delegate && _delegable(newobj)->GetMetaMethod(this,MT_CLONED,closure)) {
+			Push(newobj);
+			Push(self);
+			if(!CallMetaMethod(closure,MT_CLONED,2,temp_reg))
+				return false;
+		}
+		}
+		target = newobj;
+		return true;
+	case OT_ARRAY: 
+		target = _array(self)->Clone();
+		return true;
+	default: 
+		Raise_Error(_SC("cloning a %s"), GetTypeName(self));
+		return false;
+	}
+}
+
+bool SQVM::NewSlotA(const SQObjectPtr &self,const SQObjectPtr &key,const SQObjectPtr &val,const SQObjectPtr &attrs,bool bstatic,bool raw)
+{
+	if(type(self) != OT_CLASS) {
+		Raise_Error(_SC("object must be a class"));
+		return false;
+	}
+	SQClass *c = _class(self);
+	if(!raw) {
+		SQObjectPtr &mm = c->_metamethods[MT_NEWMEMBER];
+		if(type(mm) != OT_NULL ) {
+			Push(self); Push(key); Push(val);
+			Push(attrs);
+			Push(bstatic);
+			return CallMetaMethod(mm,MT_NEWMEMBER,5,temp_reg);
+		}
+	}
+	if(!NewSlot(self, key, val,bstatic))
+		return false;
+	if(type(attrs) != OT_NULL) {
+		c->SetAttributes(key,attrs);
+	}
+	return true;
+}
+
+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)) {
+				SQObjectPtr closure;
+				if(_delegable(self)->_delegate && _delegable(self)->GetMetaMethod(this,MT_NEWSLOT,closure)) {
+					Push(self);Push(key);Push(val);
+					if(!CallMetaMethod(closure,MT_NEWSLOT,3,res)) {
+						return false;
+					}
+					rawcall = false;
+				}
+				else {
+					rawcall = true;
+				}
+			}
+		}
+		if(rawcall) _table(self)->NewSlot(key,val); //cannot fail
+		
+		break;}
+	case OT_INSTANCE: {
+		SQObjectPtr res;
+		SQObjectPtr closure;
+		if(_delegable(self)->_delegate && _delegable(self)->GetMetaMethod(this,MT_NEWSLOT,closure)) {
+			Push(self);Push(key);Push(val);
+			if(!CallMetaMethod(closure,MT_NEWSLOT,3,res)) {
+				return false;
+			}
+			break;
+		}
+		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;
+		SQObjectPtr closure;
+		if(_delegable(self)->_delegate && _delegable(self)->GetMetaMethod(this,MT_DELSLOT,closure)) {
+			Push(self);Push(key);
+			return CallMetaMethod(closure,MT_DELSLOT,2,res);
+		}
+		else {
+			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, 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(SQObjectPtr &closure,SQMetaMethod mm,SQInteger nparams,SQObjectPtr &outres)
+{
+	//SQObjectPtr closure;
+	
+	_nmetamethodscall++;
+	if(Call(closure, nparams, _top - nparams, outres, SQFalse)) {
+		_nmetamethodscall--;
+		Pop(nparams);
+		return true;
+	}
+	_nmetamethodscall--;
+	//}
+	Pop(nparams);
+	return false;
+}
+
+void SQVM::FindOuter(SQObjectPtr &target, SQObjectPtr *stackindex)
+{
+	SQOuter **pp = &_openouters;
+	SQOuter *p;
+	SQOuter *otr;
+
+	while ((p = *pp) != NULL && p->_valptr >= stackindex) {
+		if (p->_valptr == stackindex) {
+			target = SQObjectPtr(p);
+			return;
+		}
+		pp = &p->_next;
+	}
+	otr = SQOuter::Create(_ss(this), stackindex);
+	otr->_next = *pp;
+	otr->_idx  = (stackindex - _stack._vals);
+	__ObjAddRef(otr);
+	*pp = otr;
+	target = SQObjectPtr(otr);
+}
+
+bool SQVM::EnterFrame(SQInteger newbase, SQInteger newtop, bool tailcall)
+{
+	if( !tailcall ) {
+		if( _callsstacksize == _alloccallsstacksize ) {
+			GrowCallStack();
+		}
+		ci = &_callsstack[_callsstacksize++];
+		ci->_prevstkbase = (SQInt32)(newbase - _stackbase);
+		ci->_prevtop = (SQInt32)(_top - _stackbase);
+		ci->_etraps = 0;
+		ci->_ncalls = 1;
+		ci->_generator = NULL;
+		ci->_root = SQFalse;
+	}
+	else {
+		ci->_ncalls++;
+	}
+
+	_stackbase = newbase;
+	_top = newtop;
+	if(newtop + MIN_STACK_OVERHEAD > (SQInteger)_stack.size()) {
+		if(_nmetamethodscall) {
+			Raise_Error(_SC("stack overflow, cannot resize stack while in  a metamethod"));
+			return false;
+		}
+		_stack.resize(_stack.size() + (MIN_STACK_OVERHEAD << 2));
+		RelocateOuters();
+	}
+	return true;
+}
+
+void SQVM::LeaveFrame() {
+	SQInteger last_top = _top;
+	SQInteger last_stackbase = _stackbase;
+	SQInteger css = --_callsstacksize;
+
+	/* First clean out the call stack frame */
+	ci->_closure.Null();
+	_stackbase -= ci->_prevstkbase;
+	_top = _stackbase + ci->_prevtop;
+	ci = (css) ? &_callsstack[css-1] : NULL;
+
+	if(_openouters) CloseOuters(&(_stack._vals[last_stackbase]));
+	while (last_top >= _top) {
+		_stack._vals[last_top--].Null();
+	}
+}
+
+void SQVM::RelocateOuters()
+{
+	SQOuter *p = _openouters;
+	while (p) {
+		p->_valptr = _stack._vals + p->_idx;
+		p = p->_next;
+	}
+}
+
+void SQVM::CloseOuters(SQObjectPtr *stackindex) {
+  SQOuter *p;
+  while ((p = _openouters) != NULL && p->_valptr >= stackindex) {
+    p->_value = *(p->_valptr);
+    p->_valptr = &p->_value;
+    _openouters = p->_next;
+  	__ObjRelease(p);
+  }
+}
+
+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::PushNull() { _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