/*************************************************************************/
/*  gd_script.cpp                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "gd_script.h"
#include "globals.h"
#include "global_constants.h"
#include "gd_compiler.h"
#include "os/file_access.h"
#include "io/file_access_encrypted.h"

/* TODO:

   *populate globals
   *do checks as close to debugger as possible (but don't do debugger)
   *const check plz
   *check arguments and default arguments in GDFunction
   -get property list in instance?
   *missing opcodes
   -const checks
   -make thread safe
 */



Variant *GDFunction::_get_variant(int p_address,GDInstance *p_instance,GDScript *p_script,Variant &self, Variant *p_stack,String& r_error) const{

	int address = p_address&ADDR_MASK;

	//sequential table (jump table generated by compiler)
	switch((p_address&ADDR_TYPE_MASK)>>ADDR_BITS) {

		case ADDR_TYPE_SELF: {

			if (!p_instance) {
				r_error="Cannot access self without instance.";
				return NULL;
			}
			return &self;
		} break;
		case ADDR_TYPE_CLASS: {

			return &p_script->_static_ref;
		} break;
		case ADDR_TYPE_MEMBER: {
			//member indexing is O(1)
			if (!p_instance) {
				r_error="Cannot access member without instance.";
				return NULL;
			}
			return &p_instance->members[address];
		} break;
		case ADDR_TYPE_CLASS_CONSTANT: {

			//todo change to index!
			GDScript *o=p_script;
			ERR_FAIL_INDEX_V(address,_global_names_count,NULL);
			const StringName *sn = &_global_names_ptr[address];

			while(o) {
				GDScript *s=o;
				while(s) {

					Map<StringName,Variant>::Element *E=s->constants.find(*sn);
					if (E) {
						return &E->get();
					}
					s=s->_base;
				}
				o=o->_owner;
			}


			ERR_EXPLAIN("GDCompiler bug..");
			ERR_FAIL_V(NULL);
		} break;
		case ADDR_TYPE_LOCAL_CONSTANT: {
			ERR_FAIL_INDEX_V(address,_constant_count,NULL);
			return &_constants_ptr[address];
		} break;
		case ADDR_TYPE_STACK:
		case ADDR_TYPE_STACK_VARIABLE: {
			ERR_FAIL_INDEX_V(address,_stack_size,NULL);
			return &p_stack[address];
		} break;
		case ADDR_TYPE_GLOBAL: {


			ERR_FAIL_INDEX_V(address,GDScriptLanguage::get_singleton()->get_global_array_size(),NULL);


			return &GDScriptLanguage::get_singleton()->get_global_array()[address];
		} break;
		case ADDR_TYPE_NIL: {
			return &nil;
		} break;
	}

	ERR_EXPLAIN("Bad Code! (Addressing Mode)");
	ERR_FAIL_V(NULL);
	return NULL;
}


String GDFunction::_get_call_error(const Variant::CallError& p_err, const String& p_where,const Variant**argptrs) const {



	String err_text;

	if (p_err.error==Variant::CallError::CALL_ERROR_INVALID_ARGUMENT) {
		int errorarg=p_err.argument;
		err_text="Invalid type in "+p_where+". Cannot convert argument "+itos(errorarg+1)+" from "+Variant::get_type_name(argptrs[errorarg]->get_type())+" to "+Variant::get_type_name(p_err.expected)+".";
	} else if (p_err.error==Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS) {
		err_text="Invalid call to "+p_where+". Expected "+itos(p_err.argument)+" arguments.";
	} else if (p_err.error==Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS) {
		err_text="Invalid call to "+p_where+". Expected "+itos(p_err.argument)+" arguments.";
	} else if (p_err.error==Variant::CallError::CALL_ERROR_INVALID_METHOD) {
		err_text="Invalid call. Unexisting "+p_where+".";
	} else if (p_err.error==Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL) {
		err_text="Attempt to call "+p_where+" on a null instance.";
	} else {
		err_text="Bug, call error: #"+itos(p_err.error);
	}

	return err_text;

}

static String _get_var_type(const Variant* p_type) {

	String basestr;

	if (p_type->get_type()==Variant::OBJECT) {
		Object *bobj = *p_type;
		if (!bobj) {
			basestr = "null instance";
		} else {
#ifdef DEBUG_ENABLED
			if (ObjectDB::instance_validate(bobj)) {
				if (bobj->get_script_instance())
					basestr= bobj->get_type()+" ("+bobj->get_script_instance()->get_script()->get_path().get_file()+")";
				else
					basestr = bobj->get_type();
			} else {
				basestr="previously freed instance";
			}

#else
			basestr="Object";
#endif
		}

	} else {
		basestr = Variant::get_type_name(p_type->get_type());
	}

	return basestr;

}

Variant GDFunction::call(GDInstance *p_instance, const Variant **p_args, int p_argcount, Variant::CallError& r_err, CallState *p_state) {


	if (!_code_ptr) {

		return Variant();
	}

	r_err.error=Variant::CallError::CALL_OK;

	Variant self;
	Variant retvalue;
	Variant *stack = NULL;
	Variant **call_args;
	int defarg=0;

#ifdef DEBUG_ENABLED

	//GDScriptLanguage::get_singleton()->calls++;

#endif

	uint32_t alloca_size=0;
	GDScript *_class;
	int ip=0;
	int line=_initial_line;

	if (p_state) {
		//use existing (supplied) state (yielded)
		stack=(Variant*)p_state->stack.ptr();
		call_args=(Variant**)&p_state->stack[sizeof(Variant)*p_state->stack_size];
		line=p_state->line;
		ip=p_state->ip;
		alloca_size=p_state->stack.size();
		_class=p_state->_class;
		p_instance=p_state->instance;
		defarg=p_state->defarg;
		self=p_state->self;
		//stack[p_state->result_pos]=p_state->result; //assign stack with result

	} else {

		if (p_argcount!=_argument_count) {

			if (p_argcount>_argument_count) {

				r_err.error=Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
				r_err.argument=_argument_count;

				return Variant();
			} else if (p_argcount < _argument_count - _default_arg_count) {

				r_err.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
				r_err.argument=_argument_count - _default_arg_count;
				return Variant();
			} else {

				defarg=_argument_count-p_argcount;
			}
		}

		alloca_size = sizeof(Variant*)*_call_size + sizeof(Variant)*_stack_size;

		if (alloca_size) {

			uint8_t *aptr = (uint8_t*)alloca(alloca_size);

			if (_stack_size) {

				stack=(Variant*)aptr;
				for(int i=0;i<p_argcount;i++)
					memnew_placement(&stack[i],Variant(*p_args[i]));
				for(int i=p_argcount;i<_stack_size;i++)
					memnew_placement(&stack[i],Variant);
			} else {
				stack=NULL;
			}

			if (_call_size) {

				call_args = (Variant**)&aptr[sizeof(Variant)*_stack_size];
			} else {

				call_args=NULL;
			}


		} else {
			stack=NULL;
			call_args=NULL;
		}

		if (p_instance) {
			if (p_instance->base_ref && static_cast<Reference*>(p_instance->owner)->is_referenced()) {

				self=REF(static_cast<Reference*>(p_instance->owner));
			} else {
				self=p_instance->owner;
			}
			_class=p_instance->script.ptr();
		} else {
			_class=_script;
		}
	}

	String err_text;

#ifdef DEBUG_ENABLED

    if (ScriptDebugger::get_singleton())
        GDScriptLanguage::get_singleton()->enter_function(p_instance,this,stack,&ip,&line);

#define CHECK_SPACE(m_space)\
	ERR_BREAK((ip+m_space)>_code_size)

#define GET_VARIANT_PTR(m_v,m_code_ofs) \
	Variant *m_v; \
	m_v = _get_variant(_code_ptr[ip+m_code_ofs],p_instance,_class,self,stack,err_text);\
	if (!m_v)\
		break;


#else
#define CHECK_SPACE(m_space)
#define GET_VARIANT_PTR(m_v,m_code_ofs) \
	Variant *m_v; \
	m_v = _get_variant(_code_ptr[ip+m_code_ofs],p_instance,_class,self,stack,err_text);

#endif



	bool exit_ok=false;

	while(ip<_code_size) {


		int last_opcode=_code_ptr[ip];
		switch(_code_ptr[ip]) {

			case OPCODE_OPERATOR: {

				CHECK_SPACE(5);

				bool valid;
				Variant::Operator op = (Variant::Operator)_code_ptr[ip+1];
				ERR_BREAK(op>=Variant::OP_MAX);

				GET_VARIANT_PTR(a,2);
				GET_VARIANT_PTR(b,3);
				GET_VARIANT_PTR(dst,4);

				Variant::evaluate(op,*a,*b,*dst,valid);
				if (!valid) {
					if (dst->get_type()==Variant::STRING) {
						//return a string when invalid with the error
						err_text=*dst;
						err_text += " in operator '"+Variant::get_operator_name(op)+"'.";
					} else {
						err_text="Invalid operands '"+Variant::get_type_name(a->get_type())+"' and '"+Variant::get_type_name(b->get_type())+"' in operator '"+Variant::get_operator_name(op)+"'.";
					}
					break;
				}

				ip+=5;

			} continue;
			case OPCODE_EXTENDS_TEST: {

				CHECK_SPACE(4);

				GET_VARIANT_PTR(a,1);
				GET_VARIANT_PTR(b,2);
				GET_VARIANT_PTR(dst,3);

#ifdef DEBUG_ENABLED

				if (a->get_type()!=Variant::OBJECT || a->operator Object*()==NULL) {

					err_text="Left operand of 'extends' is not an instance of anything.";
					break;

				}
				if (b->get_type()!=Variant::OBJECT || b->operator Object*()==NULL) {

					err_text="Right operand of 'extends' is not a class.";
					break;

				}
#endif


				Object *obj_A = *a;
				Object *obj_B = *b;


				GDScript *scr_B = obj_B->cast_to<GDScript>();

				bool extends_ok=false;

				if (scr_B) {
					//if B is a script, the only valid condition is that A has an instance which inherits from the script
					//in other situation, this shoul return false.

					if (obj_A->get_script_instance() && obj_A->get_script_instance()->get_language()==GDScriptLanguage::get_singleton()) {

						GDInstance *ins = static_cast<GDInstance*>(obj_A->get_script_instance());
						GDScript *cmp = ins->script.ptr();
						//bool found=false;
						while(cmp) {

							if (cmp==scr_B) {
								//inherits from script, all ok
								extends_ok=true;
								break;

							}

							cmp=cmp->_base;
						}

					}


				} else {

					GDNativeClass *nc= obj_B->cast_to<GDNativeClass>();

					if (!nc) {

						err_text="Right operand of 'extends' is not a class (type: '"+obj_B->get_type()+"').";
						break;
					}

					extends_ok=ObjectTypeDB::is_type(obj_A->get_type_name(),nc->get_name());
				}

				*dst=extends_ok;
				ip+=4;

			} continue;
			case OPCODE_SET: {

				CHECK_SPACE(3);

				GET_VARIANT_PTR(dst,1);
				GET_VARIANT_PTR(index,2);
				GET_VARIANT_PTR(value,3);

				bool valid;
				dst->set(*index,*value,&valid);

				if (!valid) {
					String v = index->operator String();
					if (v!="") {
						v="'"+v+"'";
					} else {
						v="of type '"+_get_var_type(index)+"'";
					}
					err_text="Invalid set index "+v+" (on base: '"+_get_var_type(dst)+"').";
					break;
				}

				ip+=4;
			} continue;
			case OPCODE_GET: {

				CHECK_SPACE(3);

				GET_VARIANT_PTR(src,1);
				GET_VARIANT_PTR(index,2);
				GET_VARIANT_PTR(dst,3);

				bool valid;
				*dst = src->get(*index,&valid);

				if (!valid) {
					String v = index->operator String();
					if (v!="") {
						v="'"+v+"'";
					} else {
						v="of type '"+_get_var_type(index)+"'";
					}
					err_text="Invalid get index "+v+" (on base: '"+_get_var_type(src)+"').";
					break;
				}
				ip+=4;
			} continue;
			case OPCODE_SET_NAMED: {

				CHECK_SPACE(3);

				GET_VARIANT_PTR(dst,1);
				GET_VARIANT_PTR(value,3);

				int indexname = _code_ptr[ip+2];

				ERR_BREAK(indexname<0 || indexname>=_global_names_count);
				const StringName *index = &_global_names_ptr[indexname];

				bool valid;
				dst->set_named(*index,*value,&valid);

				if (!valid) {
					String err_type;
					err_text="Invalid set index '"+String(*index)+"' (on base: '"+_get_var_type(dst)+"').";
					break;
				}

				ip+=4;
			} continue;
			case OPCODE_GET_NAMED: {


				CHECK_SPACE(3);

				GET_VARIANT_PTR(src,1);
				GET_VARIANT_PTR(dst,3);

				int indexname = _code_ptr[ip+2];

				ERR_BREAK(indexname<0 || indexname>=_global_names_count);
				const StringName *index = &_global_names_ptr[indexname];

				bool valid;
				*dst = src->get_named(*index,&valid);

				if (!valid) {
					if (src->has_method(*index)) {
						err_text="Invalid get index '"+index->operator String()+"' (on base: '"+_get_var_type(src)+"'). Did you mean '."+index->operator String()+"()' ?";
					} else {
						err_text="Invalid get index '"+index->operator String()+"' (on base: '"+_get_var_type(src)+"').";
					}
					break;
				}

				ip+=4;
			} continue;
			case OPCODE_ASSIGN: {

				CHECK_SPACE(3);
				GET_VARIANT_PTR(dst,1);
				GET_VARIANT_PTR(src,2);

				*dst = *src;

				ip+=3;

			} continue;
			case OPCODE_ASSIGN_TRUE: {

				CHECK_SPACE(2);
				GET_VARIANT_PTR(dst,1);

				*dst = true;

				ip+=2;
			} continue;
			case OPCODE_ASSIGN_FALSE: {

				CHECK_SPACE(2);
				GET_VARIANT_PTR(dst,1);

				*dst = false;

				ip+=2;
			} continue;
			case OPCODE_CONSTRUCT: {

				CHECK_SPACE(2);
				Variant::Type t=Variant::Type(_code_ptr[ip+1]);
				int argc=_code_ptr[ip+2];
				CHECK_SPACE(argc+2);
				Variant **argptrs = call_args;
				for(int i=0;i<argc;i++) {
					GET_VARIANT_PTR(v,3+i);
					argptrs[i]=v;
				}

				GET_VARIANT_PTR(dst,3+argc);
				Variant::CallError err;
				*dst = Variant::construct(t,(const Variant**)argptrs,argc,err);

				if (err.error!=Variant::CallError::CALL_OK) {

					err_text=_get_call_error(err,"'"+Variant::get_type_name(t)+"' constructor",(const Variant**)argptrs);
					break;
				}

				ip+=4+argc;
				//construct a basic type
			} continue;
			case OPCODE_CONSTRUCT_ARRAY: {

				CHECK_SPACE(1);
				int argc=_code_ptr[ip+1];
				Array array(true); //arrays are always shared
				array.resize(argc);
				CHECK_SPACE(argc+2);

				for(int i=0;i<argc;i++) {
					GET_VARIANT_PTR(v,2+i);
					array[i]=*v;

				}

				GET_VARIANT_PTR(dst,2+argc);

				*dst=array;

				ip+=3+argc;

			} continue;
			case OPCODE_CONSTRUCT_DICTIONARY: {

				CHECK_SPACE(1);
				int argc=_code_ptr[ip+1];
				Dictionary dict(true); //arrays are always shared

				CHECK_SPACE(argc*2+2);

				for(int i=0;i<argc;i++) {

					GET_VARIANT_PTR(k,2+i*2+0);
					GET_VARIANT_PTR(v,2+i*2+1);
					dict[*k]=*v;

				}

				GET_VARIANT_PTR(dst,2+argc*2);

				*dst=dict;

				ip+=3+argc*2;

			} continue;
			case OPCODE_CALL_RETURN:
			case OPCODE_CALL: {


				CHECK_SPACE(4);
				bool call_ret = _code_ptr[ip]==OPCODE_CALL_RETURN;

				int argc=_code_ptr[ip+1];
				GET_VARIANT_PTR(base,2);
				int nameg=_code_ptr[ip+3];

				ERR_BREAK(nameg<0 || nameg>=_global_names_count);
				const StringName *methodname = &_global_names_ptr[nameg];

				ERR_BREAK(argc<0);
				ip+=4;
				CHECK_SPACE(argc+1);
				Variant **argptrs = call_args;

				for(int i=0;i<argc;i++) {
					GET_VARIANT_PTR(v,i);
					argptrs[i]=v;
				}

				Variant::CallError err;
				if (call_ret) {

					GET_VARIANT_PTR(ret,argc);
					*ret = base->call(*methodname,(const Variant**)argptrs,argc,err);
				} else {

					base->call(*methodname,(const Variant**)argptrs,argc,err);
				}

				if (err.error!=Variant::CallError::CALL_OK) {


					String methodstr = *methodname;
					String basestr = _get_var_type(base);

					if (methodstr=="call") {
						if (argc>=1) {
							methodstr=String(*argptrs[0])+" (via call)";
							if (err.error==Variant::CallError::CALL_ERROR_INVALID_ARGUMENT) {
								err.argument-=1;
							}
						}
					} if (methodstr=="free") {

						if (err.error==Variant::CallError::CALL_ERROR_INVALID_METHOD) {

							if (base->is_ref()) {
								err_text="Attempted to free a reference.";
								break;
							} else if (base->get_type()==Variant::OBJECT) {

								err_text="Attempted to free a locked object (calling or emitting).";
								break;
							}
						}
					}
					err_text=_get_call_error(err,"function '"+methodstr+"' in base '"+basestr+"'",(const Variant**)argptrs);
					break;
				}

				//_call_func(NULL,base,*methodname,ip,argc,p_instance,stack);
				ip+=argc+1;

			} continue;
			case OPCODE_CALL_BUILT_IN: {

				CHECK_SPACE(4);

				GDFunctions::Function func = GDFunctions::Function(_code_ptr[ip+1]);
				int argc=_code_ptr[ip+2];
				ERR_BREAK(argc<0);

				ip+=3;
				CHECK_SPACE(argc+1);
				Variant **argptrs = call_args;

				for(int i=0;i<argc;i++) {
					GET_VARIANT_PTR(v,i);
					argptrs[i]=v;
				}

				GET_VARIANT_PTR(dst,argc);

				Variant::CallError err;

				GDFunctions::call(func,(const Variant**)argptrs,argc,*dst,err);

				if (err.error!=Variant::CallError::CALL_OK) {


					String methodstr = GDFunctions::get_func_name(func);
					err_text=_get_call_error(err,"built-in function '"+methodstr+"'",(const Variant**)argptrs);
					break;
				}
				ip+=argc+1;

			} continue;
			case OPCODE_CALL_SELF: {


			} break;
			case OPCODE_CALL_SELF_BASE: {

				CHECK_SPACE(2);
				int self_fun = _code_ptr[ip+1];
#ifdef DEBUG_ENABLED

				if (self_fun<0 || self_fun>=_global_names_count) {

					err_text="compiler bug, function name not found";
					break;
				}
#endif
				const StringName *methodname = &_global_names_ptr[self_fun];

				int argc=_code_ptr[ip+2];

				CHECK_SPACE(2+argc+1);

				Variant **argptrs = call_args;

				for(int i=0;i<argc;i++) {
					GET_VARIANT_PTR(v,i+3);
					argptrs[i]=v;
				}

				GET_VARIANT_PTR(dst,argc+3);

				const GDScript *gds = _script;


				const Map<StringName,GDFunction>::Element *E=NULL;
				while (gds->base.ptr()) {
					gds=gds->base.ptr();
					E=gds->member_functions.find(*methodname);
					if (E)
						break;
				}

				Variant::CallError err;

				if (E) {

					*dst=((GDFunction*)&E->get())->call(p_instance,(const Variant**)argptrs,argc,err);
				} else if (gds->native.ptr()) {

					if (*methodname!=GDScriptLanguage::get_singleton()->strings._init) {

						MethodBind *mb = ObjectTypeDB::get_method(gds->native->get_name(),*methodname);
						if (!mb) {
							err.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
						} else {
							*dst=mb->call(p_instance->owner,(const Variant**)argptrs,argc,err);
						}
					} else {
						err.error=Variant::CallError::CALL_OK;
					}
				} else {

					if (*methodname!=GDScriptLanguage::get_singleton()->strings._init) {
						err.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
					} else {
						err.error=Variant::CallError::CALL_OK;
					}
				}


				if (err.error!=Variant::CallError::CALL_OK) {


					String methodstr = *methodname;
					err_text=_get_call_error(err,"function '"+methodstr+"'",(const Variant**)argptrs);

					break;
				}

				ip+=4+argc;

			} continue;
			case OPCODE_YIELD:
			case OPCODE_YIELD_SIGNAL: {

				int ipofs=1;
				if (_code_ptr[ip]==OPCODE_YIELD_SIGNAL) {
					CHECK_SPACE(4);
					ipofs+=2;
				} else {
					CHECK_SPACE(2);

				}

				Ref<GDFunctionState> gdfs = memnew( GDFunctionState );
				gdfs->function=this;

				gdfs->state.stack.resize(alloca_size);
				//copy variant stack
				for(int i=0;i<_stack_size;i++) {
					memnew_placement(&gdfs->state.stack[sizeof(Variant)*i],Variant(stack[i]));
				}
				gdfs->state.stack_size=_stack_size;
				gdfs->state.self=self;
				gdfs->state.alloca_size=alloca_size;
				gdfs->state._class=_class;
				gdfs->state.ip=ip+ipofs;
				gdfs->state.line=line;
				//gdfs->state.result_pos=ip+ipofs-1;
				gdfs->state.defarg=defarg;
				gdfs->state.instance=p_instance;
				gdfs->function=this;

				retvalue=gdfs;

				if (_code_ptr[ip]==OPCODE_YIELD_SIGNAL) {
					GET_VARIANT_PTR(argobj,1);
					GET_VARIANT_PTR(argname,2);
					//do the oneshot connect

					if (argobj->get_type()!=Variant::OBJECT) {
						err_text="First argument of yield() not of type object.";
						break;
					}
					if (argname->get_type()!=Variant::STRING) {
						err_text="Second argument of yield() not a string (for signal name).";
						break;
					}
					Object *obj=argobj->operator Object *();
					String signal = argname->operator String();
#ifdef DEBUG_ENABLED

					if (!obj) {
						err_text="First argument of yield() is null.";
						break;
					}
					if (ScriptDebugger::get_singleton()) {
						if (!ObjectDB::instance_validate(obj)) {
							err_text="First argument of yield() is a previously freed instance.";
							break;
						}
					}
					if (signal.length()==0) {

						err_text="Second argument of yield() is an empty string (for signal name).";
						break;
					}

#endif
					Error err = obj->connect(signal,gdfs.ptr(),"_signal_callback",varray(gdfs),Object::CONNECT_ONESHOT);
					if (err!=OK) {
						err_text="Error connecting to signal: "+signal+" during yield().";
						break;
					}


				}

				exit_ok=true;

			} break;
			case OPCODE_YIELD_RESUME: {

				CHECK_SPACE(2);
				if (!p_state) {
					err_text=("Invalid Resume (bug?)");
					break;
				}
				GET_VARIANT_PTR(result,1);
				*result=p_state->result;
				ip+=2;

			} continue;
			case OPCODE_JUMP: {

				CHECK_SPACE(2);
				int to = _code_ptr[ip+1];

				ERR_BREAK(to<0 || to>_code_size);
				ip=to;

			} continue;
			case OPCODE_JUMP_IF: {

				CHECK_SPACE(3);

				GET_VARIANT_PTR(test,1);

				bool valid;
				bool result = test->booleanize(valid);
#ifdef DEBUG_ENABLED
				if (!valid) {

					err_text="cannot evaluate conditional expression of type: "+Variant::get_type_name(test->get_type());
					break;
				}
#endif
				if (result) {
					int to = _code_ptr[ip+2];
					ERR_BREAK(to<0 || to>_code_size);
					ip=to;
					continue;
				}
				ip+=3;
			} continue;
			case OPCODE_JUMP_IF_NOT: {

				CHECK_SPACE(3);

				GET_VARIANT_PTR(test,1);

				bool valid;
				bool result = test->booleanize(valid);
#ifdef DEBUG_ENABLED
				if (!valid) {

					err_text="cannot evaluate conditional expression of type: "+Variant::get_type_name(test->get_type());
					break;
				}
#endif
				if (!result) {
					int to = _code_ptr[ip+2];
					ERR_BREAK(to<0 || to>_code_size);
					ip=to;
					continue;
				}
				ip+=3;
			} continue;
			case OPCODE_JUMP_TO_DEF_ARGUMENT: {

				CHECK_SPACE(2);
				ip=_default_arg_ptr[defarg];

			} continue;
			case OPCODE_RETURN: {

				CHECK_SPACE(2);
				GET_VARIANT_PTR(r,1);
				retvalue=*r;
				exit_ok=true;

			} break;
			case OPCODE_ITERATE_BEGIN: {

				CHECK_SPACE(8); //space for this an regular iterate

				GET_VARIANT_PTR(counter,1);
				GET_VARIANT_PTR(container,2);

				bool valid;
				if (!container->iter_init(*counter,valid)) {
					if (!valid) {
						err_text="Unable to iterate on object of type  "+Variant::get_type_name(container->get_type())+"'.";
						break;
					}
					int jumpto=_code_ptr[ip+3];
					ERR_BREAK(jumpto<0 || jumpto>_code_size);
					ip=jumpto;
					continue;
				}
				GET_VARIANT_PTR(iterator,4);


				*iterator=container->iter_get(*counter,valid);
				if (!valid) {
					err_text="Unable to obtain iterator object of type  "+Variant::get_type_name(container->get_type())+"'.";
					break;
				}


				ip+=5; //skip regular iterate which is always next

			} continue;
			case OPCODE_ITERATE: {

				CHECK_SPACE(4);

				GET_VARIANT_PTR(counter,1);
				GET_VARIANT_PTR(container,2);

				bool valid;
				if (!container->iter_next(*counter,valid)) {
					if (!valid) {
						err_text="Unable to iterate on object of type  "+Variant::get_type_name(container->get_type())+"' (type changed since first iteration?).";
						break;
					}
					int jumpto=_code_ptr[ip+3];
					ERR_BREAK(jumpto<0 || jumpto>_code_size);
					ip=jumpto;
					continue;
				}
				GET_VARIANT_PTR(iterator,4);

				*iterator=container->iter_get(*counter,valid);
				if (!valid) {
					err_text="Unable to obtain iterator object of type  "+Variant::get_type_name(container->get_type())+"' (but was obtained on first iteration?).";
					break;
				}

				ip+=5; //loop again
			} continue;
			case OPCODE_ASSERT: {
				CHECK_SPACE(2);
				GET_VARIANT_PTR(test,1);

#ifdef DEBUG_ENABLED
				bool valid;
				bool result = test->booleanize(valid);


				if (!valid) {

					err_text="cannot evaluate conditional expression of type: "+Variant::get_type_name(test->get_type());
					break;
				}


				if (!result) {

					err_text="Assertion failed.";
					break;
				}

#endif

				ip+=2;
			} continue;
			case OPCODE_LINE: {
				CHECK_SPACE(2);

				line=_code_ptr[ip+1];
				ip+=2;

				if (ScriptDebugger::get_singleton()) {
			    // line
					bool do_break=false;

					if (ScriptDebugger::get_singleton()->get_lines_left()>0) {

						if (ScriptDebugger::get_singleton()->get_depth()<=0)
							ScriptDebugger::get_singleton()->set_lines_left( ScriptDebugger::get_singleton()->get_lines_left() -1 );
						if (ScriptDebugger::get_singleton()->get_lines_left()<=0)
							do_break=true;
					}

					if (ScriptDebugger::get_singleton()->is_breakpoint(line,source))
						do_break=true;

					if (do_break) {
						GDScriptLanguage::get_singleton()->debug_break("Breakpoint",true);
					}

					ScriptDebugger::get_singleton()->line_poll();

				}
			} continue;
			case OPCODE_END: {

				exit_ok=true;
				break;

			} break;
			default: {

				err_text="Illegal opcode "+itos(_code_ptr[ip])+" at address "+itos(ip);
			} break;

		}

		if (exit_ok)
			break;
		//error
		// function, file, line, error, explanation
		String err_file;
		if (p_instance)
			err_file=p_instance->script->path;
		else if (_class)
			err_file=_class->path;
		if (err_file=="")
			err_file="<built-in>";
		String err_func = name;
		if (p_instance && p_instance->script->name!="")
			err_func=p_instance->script->name+"."+err_func;
		int err_line=line;
		if (err_text=="") {
			err_text="Internal Script Error! - opcode #"+itos(last_opcode)+" (report please).";
		}

	if (!GDScriptLanguage::get_singleton()->debug_break(err_text,false)) {
            // debugger break did not happen

            _err_print_error(err_func.utf8().get_data(),err_file.utf8().get_data(),err_line,err_text.utf8().get_data());
        }


		break;
	}

    if (ScriptDebugger::get_singleton())
        GDScriptLanguage::get_singleton()->exit_function();


	if (_stack_size) {
		//free stack
		for(int i=0;i<_stack_size;i++)
			stack[i].~Variant();
	}

	return retvalue;

}

const int* GDFunction::get_code() const {

	return _code_ptr;
}
int GDFunction::get_code_size() const{

	return _code_size;
}

Variant GDFunction::get_constant(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx,constants.size(),"<errconst>");
	return constants[p_idx];
}

StringName GDFunction::get_global_name(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx,global_names.size(),"<errgname>");
	return global_names[p_idx];
}

int GDFunction::get_default_argument_count() const {

	return default_arguments.size();
}
int GDFunction::get_default_argument_addr(int p_arg) const{

	ERR_FAIL_INDEX_V(p_arg,default_arguments.size(),-1);
	return default_arguments[p_arg];
}


StringName GDFunction::get_name() const {

	return name;
}

int GDFunction::get_max_stack_size() const {

	return _stack_size;
}

struct _GDFKC {

    int order;
    List<int> pos;
};

struct _GDFKCS {

    int order;
    StringName id;
    int pos;

    bool operator<(const _GDFKCS &p_r) const {

        return order<p_r.order;
    }
};

void GDFunction::debug_get_stack_member_state(int p_line,List<Pair<StringName,int> > *r_stackvars) const {


    int oc=0;
    Map<StringName,_GDFKC> sdmap;
    for( const List<StackDebug>::Element *E=stack_debug.front();E;E=E->next()) {

        const StackDebug &sd=E->get();
        if (sd.line>p_line)
            break;

        if (sd.added) {

            if (!sdmap.has(sd.identifier)) {
                _GDFKC d;
                d.order=oc++;
                d.pos.push_back(sd.pos);
                sdmap[sd.identifier]=d;

            } else {
                sdmap[sd.identifier].pos.push_back(sd.pos);
            }
        } else {


            ERR_CONTINUE(!sdmap.has(sd.identifier));

            sdmap[sd.identifier].pos.pop_back();
            if (sdmap[sd.identifier].pos.empty())
                sdmap.erase(sd.identifier);
        }

    }


    List<_GDFKCS> stackpositions;
    for(Map<StringName,_GDFKC>::Element *E=sdmap.front();E;E=E->next() ) {

        _GDFKCS spp;
        spp.id=E->key();
        spp.order=E->get().order;
        spp.pos=E->get().pos.back()->get();
        stackpositions.push_back(spp);
    }

    stackpositions.sort();

    for(List<_GDFKCS>::Element *E=stackpositions.front();E;E=E->next()) {

        Pair<StringName,int> p;
        p.first=E->get().id;
        p.second=E->get().pos;
        r_stackvars->push_back(p);
    }


}

#if 0
void GDFunction::clear() {

	name=StringName();
	constants.clear();
	_stack_size=0;
	code.clear();
	_constants_ptr=NULL;
	_constant_count=0;
	_global_names_ptr=NULL;
	_global_names_count=0;
	_code_ptr=NULL;
	_code_size=0;

}
#endif
GDFunction::GDFunction() {

	_stack_size=0;
	_call_size=0;
	name="<anonymous>";
#ifdef DEBUG_ENABLED
	_func_cname=NULL;
#endif

}

/////////////////////


Variant GDFunctionState::_signal_callback(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {

	Variant arg;
	r_error.error=Variant::CallError::CALL_OK;

	ERR_FAIL_COND_V(!function,Variant());

	if (p_argcount==0) {
		r_error.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
		r_error.argument=1;
		return Variant();
	} else if (p_argcount==1) {
		//noooneee
	} else if (p_argcount==2) {
		arg=*p_args[0];
	} else {
		Array extra_args;
		for(int i=0;i<p_argcount-1;i++) {
			extra_args.push_back(*p_args[i]);
		}
		arg=extra_args;
	}

	Ref<GDFunctionState> self = *p_args[p_argcount-1];

	if (self.is_null()) {
		r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
		r_error.argument=p_argcount-1;
		r_error.expected=Variant::OBJECT;
		return Variant();
	}

	state.result=arg;
	Variant ret = function->call(NULL,NULL,0,r_error,&state);
	function=NULL; //cleaned up;
	state.result=Variant();
	return ret;
}


bool GDFunctionState::is_valid() const {

	return function!=NULL;
}

Variant GDFunctionState::resume(const Variant& p_arg) {

	ERR_FAIL_COND_V(!function,Variant());

	state.result=p_arg;
	Variant::CallError err;
	Variant ret = function->call(NULL,NULL,0,err,&state);
	function=NULL; //cleaned up;
	state.result=Variant();
	return ret;
}


void GDFunctionState::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("resume:var","arg"),&GDFunctionState::resume,DEFVAL(Variant()));
	ObjectTypeDB::bind_method(_MD("is_valid"),&GDFunctionState::is_valid);
	ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"_signal_callback",&GDFunctionState::_signal_callback,MethodInfo("_signal_callback"));

}

GDFunctionState::GDFunctionState() {

	function=NULL;
}

GDFunctionState::~GDFunctionState() {

	if (function!=NULL) {
		//never called, deinitialize stack
		for(int i=0;i<state.stack_size;i++) {
			Variant *v=(Variant*)&state.stack[sizeof(Variant)*i];
			v->~Variant();
		}
	}
}

///////////////////////////

GDNativeClass::GDNativeClass(const StringName& p_name) {

	name=p_name;
}

/*void GDNativeClass::call_multilevel(const StringName& p_method,const Variant** p_args,int p_argcount){


}*/


bool GDNativeClass::_get(const StringName& p_name,Variant &r_ret) const {

	bool ok;
	int v = ObjectTypeDB::get_integer_constant(name, p_name, &ok);

	if (ok) {
		r_ret=v;
		return true;
	} else {
		return false;
	}
}


void GDNativeClass::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("new"),&GDNativeClass::_new);

}

Variant GDNativeClass::_new() {

	Object *o = instance();
	if (!o) {
		ERR_EXPLAIN("Class type: '"+String(name)+"' is not instantiable.");
		ERR_FAIL_COND_V(!o,Variant());
	}

	Reference *ref = o->cast_to<Reference>();
	if (ref) {
		return REF(ref);
	} else {
		return o;
	}

}

Object *GDNativeClass::instance() {

	return ObjectTypeDB::instance(name);
}



GDInstance* GDScript::_create_instance(const Variant** p_args,int p_argcount,Object *p_owner,bool p_isref) {


	/* STEP 1, CREATE */

	GDInstance* instance = memnew( GDInstance );
	instance->base_ref=p_isref;
	instance->members.resize(member_indices.size());
	instance->script=Ref<GDScript>(this);
	instance->owner=p_owner;
	instance->owner->set_script_instance(instance);

	/* STEP 2, INITIALIZE AND CONSRTUCT */

	instances.insert(instance->owner);

	Variant::CallError err;
	initializer->call(instance,p_args,p_argcount,err);

	if (err.error!=Variant::CallError::CALL_OK) {
		instance->script=Ref<GDScript>();
		instance->owner->set_script_instance(NULL);
		instances.erase(p_owner);
		ERR_FAIL_COND_V(err.error!=Variant::CallError::CALL_OK, NULL); //error consrtucting
	}

	//@TODO make thread safe
	return instance;

}

Variant GDScript::_new(const Variant** p_args,int p_argcount,Variant::CallError& r_error) {

	/* STEP 1, CREATE */

	r_error.error=Variant::CallError::CALL_OK;
	REF ref;
	Object *owner=NULL;

	GDScript *_baseptr=this;
	while (_baseptr->_base) {
		_baseptr=_baseptr->_base;
	}

	if (_baseptr->native.ptr()) {
		owner=_baseptr->native->instance();
	} else {
		owner=memnew( Reference ); //by default, no base means use reference
	}

	Reference *r=owner->cast_to<Reference>();
	if (r) {
		ref=REF(r);
	}


	GDInstance* instance = _create_instance(p_args,p_argcount,owner,r!=NULL);
	if (!instance) {
		if (ref.is_null()) {
			memdelete(owner); //no owner, sorry
		}
		return Variant();
	}

	if (ref.is_valid()) {		
		return ref;
	} else {
		return owner;
	}
}

bool GDScript::can_instance() const {

	//return valid; //any script in GDscript can instance
	return valid || (!tool && !ScriptServer::is_scripting_enabled());

}

StringName GDScript::get_instance_base_type() const {

	if (native.is_valid())
		return native->get_name();
	if (base.is_valid())
		return base->get_instance_base_type();
	return StringName();
}

struct _GDScriptMemberSort {

	int index;
	StringName name;
	_FORCE_INLINE_ bool operator<(const _GDScriptMemberSort& p_member) const { return index < p_member.index; }

};


#ifdef TOOLS_ENABLED


void GDScript::_placeholder_erased(PlaceHolderScriptInstance *p_placeholder) {

	placeholders.erase(p_placeholder);
}

/*
void GDScript::_update_placeholder(PlaceHolderScriptInstance *p_placeholder) {


	List<PropertyInfo> plist;
	GDScript *scr=this;

	Map<StringName,Variant> default_values;
	while(scr) {

		Vector<_GDScriptMemberSort> msort;
		for(Map<StringName,PropertyInfo>::Element *E=scr->member_info.front();E;E=E->next()) {

			_GDScriptMemberSort ms;
			ERR_CONTINUE(!scr->member_indices.has(E->key()));
			ms.index=scr->member_indices[E->key()].index;
			ms.name=E->key();

			msort.push_back(ms);

		}

		msort.sort();
		msort.invert();
		for(int i=0;i<msort.size();i++) {

			plist.push_front(scr->member_info[msort[i].name]);
			if (scr->member_default_values.has(msort[i].name))
				default_values[msort[i].name]=scr->member_default_values[msort[i].name];
			else {
				Variant::CallError err;
				default_values[msort[i].name]=Variant::construct(scr->member_info[msort[i].name].type,NULL,0,err);
			}
		}

		scr=scr->_base;
	}


	p_placeholder->update(plist,default_values);

}*/
#endif
ScriptInstance* GDScript::instance_create(Object *p_this) {


	if (!tool && !ScriptServer::is_scripting_enabled()) {


#ifdef TOOLS_ENABLED

		//instance a fake script for editing the values
		//plist.invert();

		/*print_line("CREATING PLACEHOLDER");
		for(List<PropertyInfo>::Element *E=plist.front();E;E=E->next()) {
			print_line(E->get().name);
		}*/
		PlaceHolderScriptInstance *si = memnew( PlaceHolderScriptInstance(GDScriptLanguage::get_singleton(),Ref<Script>(this),p_this) );
		placeholders.insert(si);
		//_update_placeholder(si);
		_update_exports();
		return si;
#else
		return NULL;
#endif
	}

	GDScript *top=this;
	while(top->_base)
		top=top->_base;

	if (top->native.is_valid()) {
		if (!ObjectTypeDB::is_type(p_this->get_type_name(),top->native->get_name())) {

			if (ScriptDebugger::get_singleton()) {
				GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),0,"Script inherits from native type '"+String(top->native->get_name())+"', so it can't be instanced in object of type: '"+p_this->get_type()+"'");
			}
			ERR_EXPLAIN("Script inherits from native type '"+String(top->native->get_name())+"', so it can't be instanced in object of type: '"+p_this->get_type()+"'");
			ERR_FAIL_V(NULL);

		}
	}

	return _create_instance(NULL,0,p_this,p_this->cast_to<Reference>());

}
bool GDScript::instance_has(const Object *p_this) const {

	return instances.has((Object*)p_this);
}

bool GDScript::has_source_code() const {

	return source!="";
}
String GDScript::get_source_code() const {

	return source;
}
void GDScript::set_source_code(const String& p_code) {

	if (source==p_code)
		return;
	source=p_code;
#ifdef TOOLS_ENABLED
	source_changed_cache=true;
	//print_line("SC CHANGED "+get_path());
#endif

}

#ifdef TOOLS_ENABLED
void GDScript::_update_exports_values(Map<StringName,Variant>& values, List<PropertyInfo> &propnames) {

	if (base_cache.is_valid()) {
		base_cache->_update_exports_values(values,propnames);
	}

	for(Map<StringName,Variant>::Element *E=member_default_values_cache.front();E;E=E->next()) {
		values[E->key()]=E->get();
	}

	for (List<PropertyInfo>::Element *E=members_cache.front();E;E=E->next()) {
		propnames.push_back(E->get());
	}

}
#endif

bool GDScript::_update_exports() {

#ifdef TOOLS_ENABLED

	bool changed=false;

	if (source_changed_cache) {
		//print_line("updating source for "+get_path());
		source_changed_cache=false;
		changed=true;

		String basedir=path;

		if (basedir=="")
			basedir=get_path();

		if (basedir!="")
			basedir=basedir.get_base_dir();

		GDParser parser;
		Error err = parser.parse(source,basedir,true,path);

		if (err==OK) {

			const GDParser::Node* root = parser.get_parse_tree();
			ERR_FAIL_COND_V(root->type!=GDParser::Node::TYPE_CLASS,false);

			const GDParser::ClassNode *c = static_cast<const GDParser::ClassNode*>(root);

			if (base_cache.is_valid()) {
				base_cache->inheriters_cache.erase(get_instance_ID());
				base_cache=Ref<GDScript>();
			}


			if (c->extends_used && String(c->extends_file)!="" && String(c->extends_file) != get_path()) {

				String path = c->extends_file;
				if (path.is_rel_path()) {

					String base = get_path();
					if (base=="" || base.is_rel_path()) {

						ERR_PRINT(("Could not resolve relative path for parent class: "+path).utf8().get_data());
					} else {
						path=base.get_base_dir().plus_file(path);
					}
				}

				Ref<GDScript> bf = ResourceLoader::load(path);

				if (bf.is_valid()) {

					//print_line("parent is: "+bf->get_path());
					base_cache=bf;
					bf->inheriters_cache.insert(get_instance_ID());

					//bf->_update_exports(p_instances,true,false);

				}
			}

			members_cache.clear();;
			member_default_values_cache.clear();

			for(int i=0;i<c->variables.size();i++) {
				if (c->variables[i]._export.type==Variant::NIL)
					continue;

				members_cache.push_back(c->variables[i]._export);
				//print_line("found "+c->variables[i]._export.name);
				member_default_values_cache[c->variables[i].identifier]=c->variables[i].default_value;
			}
		}
	} else {
		//print_line("unchaged is "+get_path());

	}

	if (base_cache.is_valid()) {
		if (base_cache->_update_exports()) {
			changed = true;
		}
	}

	if (/*changed &&*/ placeholders.size()) { //hm :(

		//print_line("updating placeholders for "+get_path());

		//update placeholders if any
		Map<StringName,Variant> values;
		List<PropertyInfo> propnames;
		_update_exports_values(values,propnames);

		for (Set<PlaceHolderScriptInstance*>::Element *E=placeholders.front();E;E=E->next()) {

			E->get()->update(propnames,values);
		}
	}

	return changed;

#endif
	return false;
}

void GDScript::update_exports() {

#ifdef TOOLS_ENABLED

	_update_exports();

	Set<ObjectID> copy=inheriters_cache; //might get modified

	//print_line("update exports for "+get_path()+" ic: "+itos(copy.size()));
	for(Set<ObjectID>::Element *E=copy.front();E;E=E->next()) {
		Object *id=ObjectDB::get_instance(E->get());
		if (!id)
			continue;
		GDScript *s=id->cast_to<GDScript>();
		if (!s)
			continue;
		s->update_exports();
	}

#endif
}

void GDScript::_set_subclass_path(Ref<GDScript>& p_sc,const String& p_path) {

	p_sc->path=p_path;
	for(Map<StringName,Ref<GDScript> >::Element *E=p_sc->subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),p_path);
	}
}

Error GDScript::reload() {


	ERR_FAIL_COND_V(instances.size(),ERR_ALREADY_IN_USE);

	String basedir=path;

	if (basedir=="")
		basedir=get_path();

	if (basedir!="")
		basedir=basedir.get_base_dir();




	valid=false;
	GDParser parser;
	Error err = parser.parse(source,basedir,false,path);
	if (err) {
		if (ScriptDebugger::get_singleton()) {
			GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),parser.get_error_line(),"Parser Error: "+parser.get_error());
		}
		_err_print_error("GDScript::reload",path.empty()?"built-in":(const char*)path.utf8().get_data(),parser.get_error_line(),("Parse Error: "+parser.get_error()).utf8().get_data());
		ERR_FAIL_V(ERR_PARSE_ERROR);
	}

	GDCompiler compiler;
	err = compiler.compile(&parser,this);

	if (err) {
		if (ScriptDebugger::get_singleton()) {
			GDScriptLanguage::get_singleton()->debug_break_parse(get_path(),compiler.get_error_line(),"Parser Error: "+compiler.get_error());
		}
		_err_print_error("GDScript::reload",path.empty()?"built-in":(const char*)path.utf8().get_data(),compiler.get_error_line(),("Compile Error: "+compiler.get_error()).utf8().get_data());
		ERR_FAIL_V(ERR_COMPILATION_FAILED);
	}

	valid=true;

	for(Map<StringName,Ref<GDScript> >::Element *E=subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),path);
	}

#ifdef TOOLS_ENABLED
	/*for (Set<PlaceHolderScriptInstance*>::Element *E=placeholders.front();E;E=E->next()) {

		_update_placeholder(E->get());
	}*/
#endif
	return OK;
}

String GDScript::get_node_type() const {

	return ""; // ?
}

ScriptLanguage *GDScript::get_language() const {

	return GDScriptLanguage::get_singleton();
}


Variant GDScript::call(const StringName& p_method,const Variant** p_args,int p_argcount,Variant::CallError &r_error) {


	GDScript *top=this;
	while(top) {

		Map<StringName,GDFunction>::Element *E=top->member_functions.find(p_method);
		if (E) {

			if (!E->get().is_static()) {
				WARN_PRINT(String("Can't call non-static function: '"+String(p_method)+"' in script.").utf8().get_data());
			}

			return E->get().call(NULL,p_args,p_argcount,r_error);
		}
		top=top->_base;
	}

	//none found, regular

	return Script::call(p_method,p_args,p_argcount,r_error);

}

bool GDScript::_get(const StringName& p_name,Variant &r_ret) const {

	{


		const GDScript *top=this;
		while(top) {

			{
				const Map<StringName,Variant>::Element *E=top->constants.find(p_name);
				if (E) {

					r_ret= E->get();
					return true;
				}
			}

			{
				const Map<StringName,Ref<GDScript> >::Element *E=subclasses.find(p_name);
				if (E) {

					r_ret=E->get();
					return true;
				}
			}
			top=top->_base;
		}

		if (p_name==GDScriptLanguage::get_singleton()->strings._script_source) {

			r_ret=get_source_code();
			return true;
		}
	}



	return false;

}
bool GDScript::_set(const StringName& p_name, const Variant& p_value) {

	if (p_name==GDScriptLanguage::get_singleton()->strings._script_source) {

		set_source_code(p_value);
		reload();
	} else
		return false;

	return true;
}

void GDScript::_get_property_list(List<PropertyInfo> *p_properties) const {

	p_properties->push_back( PropertyInfo(Variant::STRING,"script/source",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR) );
}


void GDScript::_bind_methods() {

	ObjectTypeDB::bind_native_method(METHOD_FLAGS_DEFAULT,"new",&GDScript::_new,MethodInfo("new"));	

}



Error GDScript::load_byte_code(const String& p_path) {

	Vector<uint8_t> bytecode;

	if (p_path.ends_with("gde")) {

		FileAccess *fa = FileAccess::open(p_path,FileAccess::READ);
		ERR_FAIL_COND_V(!fa,ERR_CANT_OPEN);
		FileAccessEncrypted *fae = memnew( FileAccessEncrypted );
		ERR_FAIL_COND_V(!fae,ERR_CANT_OPEN);
		Vector<uint8_t> key;
		key.resize(32);
		for(int i=0;i<key.size();i++) {
			key[i]=script_encryption_key[i];
		}
		Error err = fae->open_and_parse(fa,key,FileAccessEncrypted::MODE_READ);
		ERR_FAIL_COND_V(err,err);
		bytecode.resize(fae->get_len());
		fae->get_buffer(bytecode.ptr(),bytecode.size());
		memdelete(fae);
	} else {

		bytecode = FileAccess::get_file_as_array(p_path);
	}
	ERR_FAIL_COND_V(bytecode.size()==0,ERR_PARSE_ERROR);
	path=p_path;

	String basedir=path;

	if (basedir=="")
		basedir=get_path();

	if (basedir!="")
		basedir=basedir.get_base_dir();

	valid=false;
	GDParser parser;
	Error err = parser.parse_bytecode(bytecode,basedir,get_path());
	if (err) {
		_err_print_error("GDScript::load_byte_code",path.empty()?"built-in":(const char*)path.utf8().get_data(),parser.get_error_line(),("Parse Error: "+parser.get_error()).utf8().get_data());
		ERR_FAIL_V(ERR_PARSE_ERROR);
	}

	GDCompiler compiler;
	err = compiler.compile(&parser,this);

	if (err) {
		_err_print_error("GDScript::load_byte_code",path.empty()?"built-in":(const char*)path.utf8().get_data(),compiler.get_error_line(),("Compile Error: "+compiler.get_error()).utf8().get_data());
		ERR_FAIL_V(ERR_COMPILATION_FAILED);
	}

	valid=true;

	for(Map<StringName,Ref<GDScript> >::Element *E=subclasses.front();E;E=E->next()) {

		_set_subclass_path(E->get(),path);
	}

	return OK;
}


Error GDScript::load_source_code(const String& p_path) {


	DVector<uint8_t> sourcef;
	Error err;
	FileAccess *f=FileAccess::open(p_path,FileAccess::READ,&err);
	if (err) {

		ERR_FAIL_COND_V(err,err);
	}

	int len = f->get_len();
	sourcef.resize(len+1);
	DVector<uint8_t>::Write w = sourcef.write();
	int r = f->get_buffer(w.ptr(),len);
	f->close();
	memdelete(f);
	ERR_FAIL_COND_V(r!=len,ERR_CANT_OPEN);
	w[len]=0;

	String s;
	if (s.parse_utf8((const char*)w.ptr())) {

		ERR_EXPLAIN("Script '"+p_path+"' contains invalid unicode (utf-8), so it was not loaded. Please ensure that scripts are saved in valid utf-8 unicode.");
		ERR_FAIL_V(ERR_INVALID_DATA);
	}

	source=s;
#ifdef TOOLS_ENABLED
	source_changed_cache=true;
#endif
	//print_line("LSC :"+get_path());
	path=p_path;
	return OK;

}


const Map<StringName,GDFunction>& GDScript::debug_get_member_functions() const {

	return member_functions;
}



StringName GDScript::debug_get_member_by_index(int p_idx) const {


	for(const Map<StringName,MemberInfo>::Element *E=member_indices.front();E;E=E->next()) {

		if (E->get().index==p_idx)
			return E->key();
	}

	return "<error>";
}


Ref<GDScript> GDScript::get_base() const {

	return base;
}

GDScript::GDScript() {


	_static_ref=this;
	valid=false;
	subclass_count=0;
	initializer=NULL;
	_base=NULL;
	_owner=NULL;
	tool=false;
#ifdef TOOLS_ENABLED
	source_changed_cache=false;
#endif

}





//////////////////////////////
//         INSTANCE         //
//////////////////////////////


bool GDInstance::set(const StringName& p_name, const Variant& p_value) {

	//member
	{
		const Map<StringName,GDScript::MemberInfo>::Element *E = script->member_indices.find(p_name);
		if (E) {
			members[E->get().index]=p_value;
			if (E->get().setter) {
				const Variant *val=&p_value;
				Variant::CallError err;
				call(E->get().setter,&val,1,err);
				if (err.error==Variant::CallError::CALL_OK) {
					return true; //function exists, call was successful
				}
			}
			return true;
		}
	}

	GDScript *sptr=script.ptr();
	while(sptr) {


		 Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._set);
		if (E) {

			Variant name=p_name;
			const Variant *args[2]={&name,&p_value};

			Variant::CallError err;
			Variant ret = E->get().call(this,(const Variant**)args,2,err);
			if (err.error==Variant::CallError::CALL_OK && ret.get_type()==Variant::BOOL && ret.operator bool())
				return true;
		}
		sptr = sptr->_base;
	}

	return false;
}

bool GDInstance::get(const StringName& p_name, Variant &r_ret) const {



	const GDScript *sptr=script.ptr();
	while(sptr) {

		{
			const Map<StringName,GDScript::MemberInfo>::Element *E = script->member_indices.find(p_name);
			if (E) {
				if (E->get().getter) {
					Variant::CallError err;
					r_ret=const_cast<GDInstance*>(this)->call(E->get().getter,NULL,0,err);
					if (err.error==Variant::CallError::CALL_OK) {
						return true;
					}
				}
				r_ret=members[E->get().index];
				return true; //index found

			}
		}

		{
			const Map<StringName,Variant>::Element *E = script->constants.find(p_name);
			if (E) {
				r_ret=E->get();
				return true; //index found

			}
		}

		{
			const Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._get);
			if (E) {

				Variant name=p_name;
				const Variant *args[1]={&name};

				Variant::CallError err;
				Variant ret = const_cast<GDFunction*>(&E->get())->call(const_cast<GDInstance*>(this),(const Variant**)args,1,err);
				if (err.error==Variant::CallError::CALL_OK && ret.get_type()!=Variant::NIL) {
					r_ret=ret;
					return true;
				}
			}
		}
		sptr = sptr->_base;
	}

	return false;

}
void GDInstance::get_property_list(List<PropertyInfo> *p_properties) const {
	// exported members, not doen yet!

	const GDScript *sptr=script.ptr();
	List<PropertyInfo> props;

	while(sptr) {


		const Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._get_property_list);
		if (E) {


			Variant::CallError err;
			Variant ret = const_cast<GDFunction*>(&E->get())->call(const_cast<GDInstance*>(this),NULL,0,err);
			if (err.error==Variant::CallError::CALL_OK) {

				if (ret.get_type()!=Variant::ARRAY) {

					ERR_EXPLAIN("Wrong type for _get_property list, must be an array of dictionaries.");
					ERR_FAIL();
				}
				Array arr = ret;
				for(int i=0;i<arr.size();i++) {

					Dictionary d = arr[i];
					ERR_CONTINUE(!d.has("name"));
					ERR_CONTINUE(!d.has("type"));
					PropertyInfo pinfo;
					pinfo.type = Variant::Type( d["type"].operator int());
					ERR_CONTINUE(pinfo.type<0 || pinfo.type>=Variant::VARIANT_MAX );
					pinfo.name = d["name"];
					ERR_CONTINUE(pinfo.name=="");
					if (d.has("hint"))
						pinfo.hint=PropertyHint(d["hint"].operator int());
					if (d.has("hint_string"))
						pinfo.hint_string=d["hint_string"];
					if (d.has("usage"))
						pinfo.usage=d["usage"];

					props.push_back(pinfo);

				}

			}
		}

		//instance a fake script for editing the values

		Vector<_GDScriptMemberSort> msort;
		for(Map<StringName,PropertyInfo>::Element *E=sptr->member_info.front();E;E=E->next()) {

			_GDScriptMemberSort ms;
			ERR_CONTINUE(!sptr->member_indices.has(E->key()));
			ms.index=sptr->member_indices[E->key()].index;
			ms.name=E->key();
			msort.push_back(ms);

		}

		msort.sort();
		msort.invert();
		for(int i=0;i<msort.size();i++) {

			props.push_front(sptr->member_info[msort[i].name]);

		}
#if 0
		if (sptr->member_functions.has("_get_property_list")) {

			Variant::CallError err;
			GDFunction *f = const_cast<GDFunction*>(&sptr->member_functions["_get_property_list"]);
			Variant plv = f->call(const_cast<GDInstance*>(this),NULL,0,err);

			if (plv.get_type()!=Variant::ARRAY) {

				ERR_PRINT("_get_property_list: expected array returned");
			} else {

				Array pl=plv;

				for(int i=0;i<pl.size();i++) {

					Dictionary p = pl[i];
					PropertyInfo pinfo;
					if (!p.has("name")) {
						ERR_PRINT("_get_property_list: expected 'name' key of type string.")
						continue;
					}
					if (!p.has("type")) {
						ERR_PRINT("_get_property_list: expected 'type' key of type integer.")
						continue;
					}
					pinfo.name=p["name"];
					pinfo.type=Variant::Type(int(p["type"]));
					if (p.has("hint"))
						pinfo.hint=PropertyHint(int(p["hint"]));
					if (p.has("hint_string"))
						pinfo.hint_string=p["hint_string"];
					if (p.has("usage"))
						pinfo.usage=p["usage"];


					props.push_back(pinfo);
				}
			}
		}
#endif

		sptr = sptr->_base;
	}

	//props.invert();

	for (List<PropertyInfo>::Element *E=props.front();E;E=E->next()) {

		p_properties->push_back(E->get());
	}
}

void GDInstance::get_method_list(List<MethodInfo> *p_list) const {

	const GDScript *sptr=script.ptr();
	while(sptr) {

		for (Map<StringName,GDFunction>::Element *E = sptr->member_functions.front();E;E=E->next()) {

			MethodInfo mi;
			mi.name=E->key();
			for(int i=0;i<E->get().get_argument_count();i++)
				mi.arguments.push_back(PropertyInfo(Variant::NIL,"arg"+itos(i)));
			p_list->push_back(mi);
		}
		sptr = sptr->_base;
	}

}

bool GDInstance::has_method(const StringName& p_method) const {

	const GDScript *sptr=script.ptr();
	while(sptr) {
		const Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(p_method);
		if (E)
			return true;
		sptr = sptr->_base;
	}

	return false;
}
Variant GDInstance::call(const StringName& p_method,const Variant** p_args,int p_argcount,Variant::CallError &r_error) {

	//printf("calling %ls:%i method %ls\n", script->get_path().c_str(), -1, String(p_method).c_str());

	GDScript *sptr=script.ptr();
	while(sptr) {
		Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(p_method);
		if (E) {
			return E->get().call(this,p_args,p_argcount,r_error);
		}
		sptr = sptr->_base;
	}
	r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
	return Variant();
}

void GDInstance::call_multilevel(const StringName& p_method,const Variant** p_args,int p_argcount) {

	GDScript *sptr=script.ptr();
	Variant::CallError ce;

	while(sptr) {
		Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(p_method);
		if (E) {
			E->get().call(this,p_args,p_argcount,ce);
		}
		sptr = sptr->_base;
	}

}


void GDInstance::_ml_call_reversed(GDScript *sptr,const StringName& p_method,const Variant** p_args,int p_argcount) {

	if (sptr->_base)
		_ml_call_reversed(sptr->_base,p_method,p_args,p_argcount);

	Variant::CallError ce;

	Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(p_method);
	if (E) {
		E->get().call(this,p_args,p_argcount,ce);
	}

}

void GDInstance::call_multilevel_reversed(const StringName& p_method,const Variant** p_args,int p_argcount) {

	if (script.ptr()) {
		_ml_call_reversed(script.ptr(),p_method,p_args,p_argcount);
	}
}

void GDInstance::notification(int p_notification) {

	//notification is not virutal, it gets called at ALL levels just like in C.
	Variant value=p_notification;
	const Variant *args[1]={&value };

	GDScript *sptr=script.ptr();
	while(sptr) {
		Map<StringName,GDFunction>::Element *E = sptr->member_functions.find(GDScriptLanguage::get_singleton()->strings._notification);
		if (E) {
			Variant::CallError err;
			E->get().call(this,args,1,err);
			if (err.error!=Variant::CallError::CALL_OK) {
				//print error about notification call

			}
		}
		sptr = sptr->_base;
	}

}

Ref<Script> GDInstance::get_script() const {

	return script;
}

ScriptLanguage *GDInstance::get_language() {

	return GDScriptLanguage::get_singleton();
}


GDInstance::GDInstance() {
	owner=NULL;
	base_ref=false;
}

GDInstance::~GDInstance() {
	if (script.is_valid() && owner) {
		script->instances.erase(owner);
	}
}

/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/
/************* SCRIPT LANGUAGE **************/

GDScriptLanguage *GDScriptLanguage::singleton=NULL;


String GDScriptLanguage::get_name() const {

	return "GDScript";
}

/* LANGUAGE FUNCTIONS */

void GDScriptLanguage::_add_global(const StringName& p_name,const Variant& p_value) {


	if (globals.has(p_name)) {
		//overwrite existing
		global_array[globals[p_name]]=p_value;
		return;
	}
	globals[p_name]=global_array.size();
	global_array.push_back(p_value);
	_global_array=global_array.ptr();
}

void GDScriptLanguage::init() {


	//populate global constants
	int gcc=GlobalConstants::get_global_constant_count();
	for(int i=0;i<gcc;i++) {

		_add_global(StaticCString::create(GlobalConstants::get_global_constant_name(i)),GlobalConstants::get_global_constant_value(i));
	}

	_add_global(StaticCString::create("PI"),Math_PI);

	//populate native classes

	List<String> class_list;
	ObjectTypeDB::get_type_list(&class_list);
	for(List<String>::Element *E=class_list.front();E;E=E->next()) {

		StringName n = E->get();
		String s = String(n);
		if (s.begins_with("_"))
			n=s.substr(1,s.length());

		if (globals.has(n))
			continue;
		Ref<GDNativeClass> nc = memnew( GDNativeClass(E->get()) );
		_add_global(n,nc);
	}

	//populate singletons

	List<Globals::Singleton> singletons;
	Globals::get_singleton()->get_singletons(&singletons);
	for(List<Globals::Singleton>::Element *E=singletons.front();E;E=E->next()) {

		_add_global(E->get().name,E->get().ptr);
	}
}

String GDScriptLanguage::get_type() const {

	return "GDScript";
}
String GDScriptLanguage::get_extension() const {

	return "gd";
}
Error GDScriptLanguage::execute_file(const String& p_path)  {

	// ??
	return OK;
}
void GDScriptLanguage::finish()  {


}


void GDScriptLanguage::frame() {

//	print_line("calls: "+itos(calls));
	calls=0;
}

/* EDITOR FUNCTIONS */
void GDScriptLanguage::get_reserved_words(List<String> *p_words) const  {

	static const char *_reserved_words[]={
		"break",
		"class",
		"continue",
		"const",
		"else",
		"elif",
		"enum",
		"extends"	,
		"for"	,
		"func"	,
		"if"	,
		"in"	,
		"null"	,
		"not"	,
		"return"	,
		"self"	,
		"while"	,
		"true"	,
		"false"	,
		"tool",
		"var",
		"setget",
		"pass",
		"and",
		"or",
		"export",
		"assert",
		"yield",
		"static",
		"float",
		"int",
	0};


	const char **w=_reserved_words;


	while (*w) {

		p_words->push_back(*w);
		w++;
	}

	for(int i=0;i<GDFunctions::FUNC_MAX;i++) {
		p_words->push_back(GDFunctions::get_func_name(GDFunctions::Function(i)));
	}

}

GDScriptLanguage::GDScriptLanguage() {

	calls=0;
	ERR_FAIL_COND(singleton);
	singleton=this;
	strings._init = StaticCString::create("_init");
	strings._notification = StaticCString::create("_notification");
	strings._set= StaticCString::create("_set");
	strings._get= StaticCString::create("_get");
	strings._get_property_list= StaticCString::create("_get_property_list");
	strings._script_source=StaticCString::create("script/source");
	_debug_parse_err_line=-1;
	_debug_parse_err_file="";

    _debug_call_stack_pos=0;
    int dmcs=GLOBAL_DEF("debug/script_max_call_stack",1024);
    if (ScriptDebugger::get_singleton()) {
        //debugging enabled!

	_debug_max_call_stack = dmcs;
        if (_debug_max_call_stack<1024)
            _debug_max_call_stack=1024;
	_call_stack = memnew_arr( CallLevel, _debug_max_call_stack+1 );

    } else {
        _debug_max_call_stack=0;
        _call_stack=NULL;
    }

}


GDScriptLanguage::~GDScriptLanguage() {

    if (_call_stack)  {
        memdelete_arr(_call_stack);
    }
    singleton=NULL;
}

/*************** RESOURCE ***************/

RES ResourceFormatLoaderGDScript::load(const String &p_path,const String& p_original_path) {

	GDScript *script = memnew( GDScript );

	Ref<GDScript> scriptres(script);

	if (p_path.ends_with(".gde") || p_path.ends_with(".gdc")) {

		script->set_script_path(p_original_path); // script needs this.
		script->set_path(p_original_path);
		Error err = script->load_byte_code(p_path);


		if (err!=OK) {

			ERR_FAIL_COND_V(err!=OK, RES());
		}

	} else {
		Error err = script->load_source_code(p_path);

		if (err!=OK) {

			ERR_FAIL_COND_V(err!=OK, RES());
		}

		script->set_script_path(p_original_path); // script needs this.
		script->set_path(p_original_path);
		//script->set_name(p_path.get_file());

		script->reload();
	}

	return scriptres;
}
void ResourceFormatLoaderGDScript::get_recognized_extensions(List<String> *p_extensions) const {

	p_extensions->push_back("gd");
	p_extensions->push_back("gdc");
	p_extensions->push_back("gde");
}

bool ResourceFormatLoaderGDScript::handles_type(const String& p_type) const {

	return (p_type=="Script" || p_type=="GDScript");
}

String ResourceFormatLoaderGDScript::get_resource_type(const String &p_path) const {

	String el = p_path.extension().to_lower();
	if (el=="gd" || el=="gdc" || el=="gde")
		return "GDScript";
	return "";
}


Error ResourceFormatSaverGDScript::save(const String &p_path,const RES& p_resource,uint32_t p_flags) {

	Ref<GDScript> sqscr = p_resource;
	ERR_FAIL_COND_V(sqscr.is_null(),ERR_INVALID_PARAMETER);

	String source = sqscr->get_source_code();

	Error err;
	FileAccess *file = FileAccess::open(p_path,FileAccess::WRITE,&err);


	if (err) {

		ERR_FAIL_COND_V(err,err);
	}

	file->store_string(source);
	if (file->get_error()!=OK && file->get_error()!=ERR_FILE_EOF) {
		memdelete(file);
		return ERR_CANT_CREATE;
	}
	file->close();
	memdelete(file);
	return OK;
}

void ResourceFormatSaverGDScript::get_recognized_extensions(const RES& p_resource,List<String> *p_extensions) const {

	if (p_resource->cast_to<GDScript>()) {
		p_extensions->push_back("gd");
	}

}
bool ResourceFormatSaverGDScript::recognize(const RES& p_resource) const {

	return p_resource->cast_to<GDScript>()!=NULL;
}