/*
	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[_top-1])

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)) {
				switch(op) {
				case '+': trg = _integer(o1) + _integer(o2); break;
				case '-': trg = _integer(o1) - _integer(o2); break;
				case '/': if(_integer(o2) == 0) { Raise_Error(_SC("division by zero")); return false; }
					trg = _integer(o1) / _integer(o2); 
					break;
				case '*': trg = _integer(o1) * _integer(o2); break;
				case '%': trg = _integer(o1) % _integer(o2); break;
				}
			}else{
				switch(op) {
				case '+': trg = tofloat(o1) + tofloat(o2); break;
				case '-': trg = tofloat(o1) - tofloat(o2); break;
				case '/': trg = tofloat(o1) / tofloat(o2); break;
				case '*': trg = tofloat(o1) * tofloat(o2); break;
				case '%': trg = SQFloat(fmod((double)tofloat(o1),(double)tofloat(o2))); break;
				}
			}	
		} 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;
}

SQObjectPtr &stack_get(HSQUIRRELVM v,SQInteger idx){return ((idx>=0)?(v->GetAt(idx+v->_stackbase-1)):(v->GetUp(idx)));}

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_;
	INIT_CHAIN();ADD_TO_CHAIN(&_ss(this)->_gc_chain,this);
}

void SQVM::Finalize()
{
	_roottable = _null_;
	_lasterror = _null_;
	_errorhandler = _null_;
	_debughook = _null_;
	temp_reg = _null_;
	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;
	}
	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;
			}
		}
		return true;

	}
	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:
			Push(o1);Push(o2);
			if(_delegable(o1)->_delegate)CallMetaMethod(_delegable(o1),MT_CMP,2,res);
			break;
		}
		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;
}

bool SQVM::StringCat(const SQObjectPtr &str,const SQObjectPtr &obj,SQObjectPtr &dest)
{
	switch(type(obj))
	{
	case OT_STRING:
		switch(type(str)){
		case OT_STRING:	{
			SQInteger l=_string(str)->_len,ol=_string(obj)->_len;
			SQChar *s=_sp(rsl(l+ol+1));
			memcpy(s,_stringval(str),rsl(l));memcpy(s+l,_stringval(obj),rsl(ol));s[l+ol]=_SC('\0');
			break;
		}
		case OT_FLOAT:
			scsprintf(_sp(rsl(NUMBER_MAX_CHAR+_string(obj)->_len+1)),_SC("%g%s"),_float(str),_stringval(obj));
			break;
		case OT_INTEGER:
			scsprintf(_sp(rsl(NUMBER_MAX_CHAR+_string(obj)->_len+1)),_SC("%d%s"),_integer(str),_stringval(obj));
			break;
		default:
			Raise_Error(_SC("string concatenation between '%s' and '%s'"),GetTypeName(str),GetTypeName(obj));
			return false;
		}
		dest=SQString::Create(_ss(this),_spval);
		break;
	case OT_FLOAT:
		scsprintf(_sp(rsl(NUMBER_MAX_CHAR+_string(str)->_len+1)),_SC("%s%g"),_stringval(str),_float(obj));
		dest=SQString::Create(_ss(this),_spval);
		break;
	case OT_INTEGER:
		scsprintf(_sp(rsl(NUMBER_MAX_CHAR+_string(str)->_len+1)),_SC("%s%d"),_stringval(str),_integer(obj));
		dest=SQString::Create(_ss(this),_spval);
		break;
	default:
		Raise_Error(_SC("string concatenation between '%s' and '%s'"),GetTypeName(str),GetTypeName(obj));
		return false;
	}
	return true;
}

const SQChar *IdType2Name(SQObjectType type)
{
	switch(_RAW_TYPE(type))
	{
	case _RT_NULL:return _SC("null");
	case _RT_INTEGER:return _SC("integer");
	case _RT_FLOAT:return _SC("float");
	case _RT_BOOL:return _SC("bool");
	case _RT_STRING:return _SC("string");
	case _RT_TABLE:return _SC("table");
	case _RT_ARRAY:return _SC("array");
	case _RT_GENERATOR:return _SC("generator");
	case _RT_CLOSURE:
	case _RT_NATIVECLOSURE:
		return _SC("function");
	case _RT_USERDATA:
	case _RT_USERPOINTER:
		return _SC("userdata");
	case _RT_THREAD: return _SC("thread");
	case _RT_FUNCPROTO: return _SC("function");
	case _RT_CLASS: return _SC("class");
	case _RT_INSTANCE: return _SC("instance");
	case _RT_WEAKREF: return _SC("weakref");
	default:
		return NULL;
	}
}

const SQChar *GetTypeName(const SQObjectPtr &obj1)
{
	return IdType2Name(type(obj1));	
}

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);
	_callsstack.reserve(4);
	_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 nargs,SQInteger stackbase,bool tailcall)
{
	SQFunctionProto *func = _funcproto(closure->_function);
	//const SQInteger outerssize = func->_outervalues.size();

	const SQInteger paramssize = func->_parameters.size();
	const SQInteger oldtop = _top;
	const SQInteger newtop = stackbase + func->_stacksize;
	
	
	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[stackbase+paramssize+n]);
			_stack[stackbase+paramssize+n] = _null_;
		}
	}
	else {
		if (paramssize != nargs) {
			Raise_Error(_SC("wrong number of parameters"));
			return false;
		}
		
	}
	
	if (!tailcall) {
		PUSH_CALLINFO(this, CallInfo());
		ci->_etraps = 0;
		ci->_prevstkbase = stackbase - _stackbase;
		ci->_target = target;
		ci->_prevtop = _top - _stackbase;
		ci->_ncalls = 1;
		ci->_root = SQFalse;
	}
	else {
		ci->_ncalls++;
	}
	ci->_vargs.size = (nargs - paramssize);
	ci->_vargs.base = _vargsstack.size()-(nargs - paramssize);
	ci->_closure._unVal.pClosure = closure;
	ci->_closure._type = OT_CLOSURE;
	ci->_iv = &func->_instructions;
	ci->_literals = &func->_literals;
	//grows the stack if needed
	if (((SQUnsignedInteger)newtop + (func->_stacksize<<1)) > _stack.size()) {
		_stack.resize(_stack.size() + (func->_stacksize<<1));
	}
		
	_top = newtop;
	_stackbase = stackbase;
	ci->_ip = ci->_iv->_vals;
	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[oldstackbase+_arg1];
		else retval = _null_;
	}
	else {
		if (_arg0 != MAX_FUNC_STACKSIZE)
			STK(target) = _stack[oldstackbase+_arg1];
		else
			STK(target) = _null_;
	}

	while (last_top >= _top) _stack[last_top--].Null();
	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 (*((SQInteger *)&_i_._arg1))
#define arg2 (_i_._arg2)
#define arg3 (_i_._arg3)
#define sarg3 (*((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(stoploop) {finished = stoploop; return true; }
bool SQVM::FOREACH_OP(SQObjectPtr &o1,SQObjectPtr &o2,SQObjectPtr 
&o3,SQObjectPtr &o4,SQInteger arg_2,bool &finished)
{
	SQInteger nrefidx;
	switch(type(o1)) {
	case OT_TABLE:
		if((nrefidx = _table(o1)->Next(false,o4, o2, o3)) == -1) _FINISH(true);
		o4 = (SQInteger)nrefidx; _FINISH(false);
	case OT_ARRAY:
		if((nrefidx = _array(o1)->Next(o4, o2, o3)) == -1) _FINISH(true);
		o4 = (SQInteger) nrefidx; _FINISH(false);
	case OT_STRING:
		if((nrefidx = _string(o1)->Next(o4, o2, o3)) == -1)_FINISH(true);
		o4 = (SQInteger)nrefidx; _FINISH(false);
	case OT_CLASS:
		if((nrefidx = _class(o1)->Next(o4, o2, o3)) == -1)_FINISH(true);
		o4 = (SQInteger)nrefidx; _FINISH(false);
	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(true);
				if(!Get(o1, itr, o3, false,false)) {
					Raise_Error(_SC("_nexti returned an invalid idx"));
					return false;
				}
				_FINISH(false);
			}
			Raise_Error(_SC("_nexti failed"));
			return false;
		}
		break;
	case OT_GENERATOR:
		if(_generator(o1)->_state == SQGenerator::eDead) _FINISH(true);
		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(false);
		}
	}
	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->_outervalues.size()) {
		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;
			}
		}
	}
	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 != MAX_LITERALS) {
		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);
	_class(target)->_attributes = attrs;
	return true;
}

bool SQVM::IsFalse(SQObjectPtr &o)
{
	SQObjectType t = type(o);
	if((t & SQOBJECT_CANBEFALSE)
		&& ((t == OT_NULL) || ((t == OT_INTEGER || t == OT_BOOL) && _integer(o) == 0)
		|| (t == OT_FLOAT && _float(o) == SQFloat(0.0)))) {
			return true;
		}
	return false;
}

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::Execute(SQObjectPtr &closure, SQInteger target, SQInteger nargs, SQInteger stackbase,SQObjectPtr &outres, 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;
	bool ct_tailcall; 

	switch(et) {
		case ET_CALL: 
			if(!StartCall(_closure(closure), _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;
			}
			ci->_root = SQTrue;
			break;
		case ET_RESUME_GENERATOR: _generator(closure)->Resume(this, target); ci->_root = SQTrue; traps += ci->_etraps; break;
		case ET_RESUME_VM:
			traps = _suspended_traps;
			ci->_root = _suspended_root;
			_suspended = SQFalse;
			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_TAILCALL:
				temp_reg = STK(arg1);
				if (type(temp_reg) == OT_CLOSURE){ 
					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;
					goto common_call;
				}
			case _OP_CALL: {
					ct_tailcall = false;
					ct_target = arg0;
					temp_reg = STK(arg1);
common_call:
					SQInteger last_top = _top;
					switch (type(temp_reg)) {
					case OT_CLOSURE:{
						_GUARD(StartCall(_closure(temp_reg), ct_target, arg3, ct_tailcall?_stackbase:_stackbase+arg2, ct_tailcall));
						if (_funcproto(_closure(temp_reg)->_function)->_bgenerator) {
							SQGenerator *gen = SQGenerator::Create(_ss(this), _closure(temp_reg));
							_GUARD(gen->Yield(this));
							Return(1, ct_target, temp_reg);
							STK(ct_target) = gen;
							while (last_top >= _top) _stack[last_top--].Null();
							continue;
						}
						if (type(_debughook) != OT_NULL && _rawval(_debughook) != _rawval(ci->_closure))
							CallDebugHook(_SC('c'));
						}
						break;
					case OT_NATIVECLOSURE: {
						bool suspend;
						_GUARD(CallNative(_nativeclosure(temp_reg), arg3, _stackbase+arg2, ct_tailcall, temp_reg,suspend));
						if(suspend){
							_suspended = SQTrue;
							_suspended_target = ct_target;
							_suspended_root = ci->_root;
							_suspended_traps = traps;
							outres = temp_reg;
							return true;
						}
						STK(ct_target) = temp_reg;
										   }
						break;
					case OT_CLASS:{
						_GUARD(CreateClassInstance(_class(temp_reg),arg3,_stackbase+arg2,STK(ct_target)));
						}
						break;
					case OT_TABLE:
					case OT_USERDATA:
					case OT_INSTANCE:
						{
						Push(temp_reg);
						for (SQInteger i = 0; i < arg3; i++) Push(STK(arg2 + i));
						if (_delegable(temp_reg) && CallMetaMethod(_delegable(temp_reg), MT_CALL, arg3+1, temp_reg)){
							STK(ct_target) = temp_reg;
							break;
						}
						Raise_Error(_SC("attempt to call '%s'"), GetTypeName(temp_reg));
						SQ_THROW();
					  }
					default:
						Raise_Error(_SC("attempt to call '%s'"), GetTypeName(temp_reg));
						SQ_THROW();
					}
				}
				  continue;
			case _OP_PREPCALL:
					if (!Get(STK(arg2), STK(arg1), temp_reg, false,true))
					{ Raise_IdxError(STK(arg1)); SQ_THROW(); }
					goto common_prepcall;
			case _OP_PREPCALLK:
					if (!Get(STK(arg2), (*ci->_literals)[arg1], temp_reg,false,true)) {
						if(type(STK(arg2)) == OT_CLASS) { //hack?
							if(_class_ddel->Get((*ci->_literals)[arg1],temp_reg)) {
								STK(arg3) = STK(arg2);
								TARGET = temp_reg;
								continue;
							}
						}
						{ Raise_IdxError((*ci->_literals)[arg1]); SQ_THROW();}
					}
common_prepcall:
					if(type(STK(arg2)) == OT_CLASS) {
						STK(arg3) = STK(0); // this
					}
					else {
						STK(arg3) = STK(arg2);
					}
					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)));
				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(type((ci)->_generator) == OT_GENERATOR) {
					_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:
				switch(type(STK(arg1))) {
				case OT_TABLE: 
                  	TARGET = _table(STK(arg1))->_delegate?SQObjectPtr(_table(STK(arg1))->_delegate):_null_;
					continue;
				case OT_CLASS: TARGET = _class(STK(arg1))->_base?_class(STK(arg1))->_base:_null_;
					continue;
				}
				Raise_Error(_SC("the %s type doesn't have a parent slot"), GetTypeName(STK(arg1)));
				SQ_THROW();
				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) {
					TARGET = SQInteger(~_integer(STK(arg1)));
					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(type(ci->_generator) == OT_GENERATOR) {
					if(sarg1 != MAX_FUNC_STACKSIZE) temp_reg = STK(arg1);
					_GUARD(_generator(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:{ bool finished;
				_GUARD(FOREACH_OP(STK(arg0),STK(arg2),STK(arg2+1),STK(arg2+2),arg2,finished));
				if(finished) ci->_ip += sarg1; }
				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:
				_etraps.push_back(SQExceptionTrap(_top,_stackbase, &ci->_iv->_vals[(ci->_ip-ci->_iv->_vals)+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:
				_GUARD(NewSlot(STK(arg1), STK(arg2), STK(arg3)));
				_class(STK(arg1))->SetAttributes(STK(arg2),STK(arg2-1));
				if(arg0 != arg3) TARGET = STK(arg3);
				continue;
			}
			
		}
	}
exception_trap:
	{
		SQObjectPtr currerror = _lasterror;
//		dumpstack(_stackbase);
		SQInteger n = 0;
		SQInteger last_top = _top;
		if(ci) {
			if(traps) {
				do {
					if(ci->_etraps > 0) {
						SQExceptionTrap &et = _etraps.top();
						ci->_ip = et._ip;
						_top = et._stacksize;
						_stackbase = et._stackbase;
						_stack[_stackbase+et._extarget] = currerror;
						_etraps.pop_back(); traps--; ci->_etraps--;
						while(last_top >= _top) _stack[last_top--].Null();
						goto exception_restore;
					}
					//if is a native closure
					if(type(ci->_closure) != OT_CLOSURE && n)
						break;
					if(type(ci->_generator) == OT_GENERATOR) _generator(ci->_generator)->Kill();
					PopVarArgs(ci->_vargs);
					POP_CALLINFO(this);
					n++;
				}while(_callsstack.size());
			}
			//call the hook
			CallErrorHandler(currerror);
			//remove call stack until a C function is found or the cstack is empty
			if(ci) do{
				SQBool exitafterthisone = ci->_root;
				if(type(ci->_generator) == OT_GENERATOR) _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(_callsstack.size());

			while(last_top >= _top) _stack[last_top--].Null();
		}
		_lasterror = currerror;
		return false;
	}
	assert(0);
}

bool SQVM::CreateClassInstance(SQClass *theclass, SQInteger nargs, SQInteger stackbase, SQObjectPtr &retval)
{
	SQObjectPtr constr;
	SQObjectPtr inst = theclass->CreateInstance();
	_stack[stackbase] = inst;
	if(theclass->Get(_ss(this)->_constructoridx,constr)) {
		if(!Call(constr,nargs,stackbase,constr))
			return false;
	}
	retval = inst;
	return true;
}

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

bool SQVM::CallNative(SQNativeClosure *nclosure,SQInteger nargs,SQInteger stackbase,bool tailcall,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[i] != -1) && !(type(_stack[stackbase+i]) & nclosure->_typecheck[i])) {
                Raise_ParamTypeError(i,nclosure->_typecheck[i],type(_stack[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;
	PUSH_CALLINFO(this, CallInfo());
	ci->_etraps = 0;
	ci->_closure._unVal.pNativeClosure = nclosure;
	ci->_closure._type = OT_NATIVECLOSURE;
	ci->_prevstkbase = stackbase - _stackbase;
	ci->_ncalls = 1;
	_stackbase = stackbase;
	//push free variables
	SQInteger outers = nclosure->_outervalues.size();
	for (SQInteger i = 0; i < outers; i++) {
		Push(nclosure->_outervalues[i]);
	}
	ci->_prevtop = (oldtop - oldstackbase);
	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(); }
	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;
	}
	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(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;
	switch(type(self)){
	case OT_TABLE:
		target = _table(self)->Clone();
		goto cloned_mt;
	case OT_INSTANCE:
		target = _instance(self)->Clone(_ss(this));
cloned_mt:
		if(_delegable(target)->_delegate){
			Push(target);
			Push(self);
			CallMetaMethod(_delegable(target),MT_CLONED,2,temp_reg);
		}
		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)
{
	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_CLASS: 
		if(!_class(self)->NewSlot(key,val)) {
			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)
{
#ifdef _DEBUG
SQInteger prevstackbase = _stackbase;
#endif
	switch(type(closure)) {
	case OT_CLOSURE:
		return Execute(closure, _top - nparams, nparams, stackbase,outres);
		break;
	case OT_NATIVECLOSURE:{
		bool suspend;
		return CallNative(_nativeclosure(closure), nparams, stackbase, false, outres,suspend);
		
						  }
		break;
	case OT_CLASS:
		return CreateClassInstance(_class(closure),nparams,stackbase,outres);
		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(mm, closure)) {
		if(Call(closure, nparams, _top - nparams, outres)) {
			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--;
}


#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.back();
	scprintf(_SC("IP: %d\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"));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