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object.cpp
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/*************************************************************************/
/* object.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 "object.h"
#include "print_string.h"
#include "object_type_db.h"
#include "script_language.h"
#include "message_queue.h"
#include "core_string_names.h"
#include "translation.h"
#include "os/os.h"
#include "resource.h"
#ifdef DEBUG_ENABLED
struct _ObjectDebugLock {
Object *obj;
_ObjectDebugLock(Object *p_obj) {
obj=p_obj;
obj->_lock_index.ref();
}
~_ObjectDebugLock() {
obj->_lock_index.unref();
}
};
#define OBJ_DEBUG_LOCK _ObjectDebugLock _debug_lock(this);
#else
#define OBJ_DEBUG_LOCK
#endif
Array convert_property_list(const List<PropertyInfo> * p_list) {
Array va;
for (const List<PropertyInfo>::Element *E=p_list->front();E;E=E->next()) {
const PropertyInfo &pi = E->get();
Dictionary d;
d["name"]=pi.name;
d["type"]=pi.type;
d["hint"]=pi.hint;
d["hint_string"]=pi.hint_string;
d["usage"]=pi.usage;
va.push_back(d);
}
return va;
}
MethodInfo::MethodInfo() {
id=0;
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name) {
id=0;
name=p_name;
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name, const PropertyInfo& p_param1) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3,const PropertyInfo& p_param4) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
arguments.push_back( p_param4 );
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3,const PropertyInfo& p_param4,const PropertyInfo& p_param5) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
arguments.push_back( p_param4 );
arguments.push_back( p_param5 );
flags=METHOD_FLAG_NORMAL;
}
MethodInfo::MethodInfo(Variant::Type ret) {
id=0;
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name) {
id=0;
name=p_name;
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name, const PropertyInfo& p_param1) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3,const PropertyInfo& p_param4) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
arguments.push_back( p_param4 );
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
MethodInfo::MethodInfo(Variant::Type ret,const String& p_name, const PropertyInfo& p_param1,const PropertyInfo& p_param2,const PropertyInfo& p_param3,const PropertyInfo& p_param4,const PropertyInfo& p_param5) {
id=0;
name=p_name;
arguments.push_back( p_param1 );
arguments.push_back( p_param2 );
arguments.push_back( p_param3 );
arguments.push_back( p_param4 );
arguments.push_back( p_param5 );
flags=METHOD_FLAG_NORMAL;
return_val.type=ret;
}
Object::Connection::operator Variant() const {
Dictionary d;
d["source"]=source;
d["signal"]=signal;
d["target"]=target;
d["method"]=method;
d["flags"]=flags;
d["binds"]=binds;
return d;
}
bool Object::Connection::operator<(const Connection& p_conn) const {
if (source==p_conn.source) {
if (signal == p_conn.signal) {
if (target == p_conn.target) {
return method < p_conn.method;
} else {
return target < p_conn.target;
}
} else
return signal < p_conn.signal;
} else {
return source<p_conn.source;
}
}
Object::Connection::Connection(const Variant& p_variant) {
Dictionary d=p_variant;
if (d.has("source"))
source=d["source"];
if (d.has("signal"))
signal=d["signal"];
if (d.has("target"))
target=d["target"];
if (d.has("method"))
method=d["method"];
if (d.has("flags"))
flags=d["flags"];
if (d.has("binds"))
binds=d["binds"];
}
bool Object::_predelete() {
_predelete_ok=1;
notification(NOTIFICATION_PREDELETE,true);
if (_predelete_ok) {
_type_ptr=NULL; //must restore so destructors can access type ptr correctly
}
return _predelete_ok;
}
void Object::_postinitialize() {
_type_ptr=_get_type_namev();
_initialize_typev();
notification(NOTIFICATION_POSTINITIALIZE);
}
void Object::get_valid_parents_static(List<String> *p_parents) {
}
void Object::_get_valid_parents_static(List<String> *p_parents) {
}
#if 0
//old style set, deprecated
void Object::set(const String& p_name, const Variant& p_value) {
_setv(p_name,p_value);
//if (!_use_builtin_script())
// return;
bool success;
ObjectTypeDB::set_property(this,p_name,p_value,success);
if (success) {
return;
}
if (p_name=="__meta__") {
metadata=p_value;
} else if (p_name=="script/script") {
set_script(p_value);
} else if (script_instance) {
script_instance->set(p_name,p_value);
}
}
#endif
void Object::set(const StringName& p_name, const Variant& p_value, bool *r_valid) {
#ifdef TOOLS_ENABLED
_edited=true;
#endif
if (script_instance) {
if (script_instance->set(p_name,p_value)) {
if (r_valid)
*r_valid=true;
return;
}
}
//try built-in setgetter
{
if (ObjectTypeDB::set_property(this,p_name,p_value)) {
if (r_valid)
*r_valid=true;
return;
}
}
if (p_name==CoreStringNames::get_singleton()->_script) {
set_script(p_value);
if (r_valid)
*r_valid=true;
return;
} else if (p_name==CoreStringNames::get_singleton()->_meta) {
//set_meta(p_name,p_value);
metadata=p_value;
if (r_valid)
*r_valid=true;
return;
} else {
//something inside the object... :|
bool success = _setv(p_name,p_value);
if (success) {
if (r_valid)
*r_valid=true;
return;
}
setvar(p_name,p_value,r_valid);
}
}
Variant Object::get(const StringName& p_name, bool *r_valid) const{
Variant ret;
if (script_instance) {
if (script_instance->get(p_name,ret)) {
if (r_valid)
*r_valid=true;
return ret;
}
}
//try built-in setgetter
{
if (ObjectTypeDB::get_property(const_cast<Object*>(this),p_name,ret)) {
if (r_valid)
*r_valid=true;
return ret;
}
}
if (p_name==CoreStringNames::get_singleton()->_script) {
ret = get_script();
if (r_valid)
*r_valid=true;
return ret;
} else if (p_name==CoreStringNames::get_singleton()->_meta) {
ret = metadata;
if (r_valid)
*r_valid=true;
return ret;
} else {
//something inside the object... :|
bool success = _getv(p_name,ret);
if (success) {
if (r_valid)
*r_valid=true;
return ret;
}
//if nothing else, use getvar
return getvar(p_name,r_valid);
}
}
#if 0
//old style get, deprecated
Variant Object::get(const String& p_name) const {
Variant ret=_getv(p_name);
if (ret.get_type()!=Variant::NIL)
return ret;
bool success;
ObjectTypeDB::get_property(const_cast<Object*>(this),p_name,ret,success);
if (success) {
return ret;
}
if (p_name=="__meta__")
return metadata;
else if (p_name=="script/script")
return script;
if (script_instance) {
return script_instance->get(p_name);
}
return Variant();
}
#endif
void Object::get_property_list(List<PropertyInfo> *p_list,bool p_reversed) const {
if (script_instance && p_reversed) {
p_list->push_back( PropertyInfo(Variant::NIL,"Script Variables",PROPERTY_HINT_NONE,String(),PROPERTY_USAGE_CATEGORY));
script_instance->get_property_list(p_list);
}
_get_property_listv(p_list,p_reversed);
if (!_use_builtin_script())
return;
if (!is_type("Script")) // can still be set, but this is for userfriendlyness
p_list->push_back( PropertyInfo( Variant::OBJECT, "script/script", PROPERTY_HINT_RESOURCE_TYPE, "Script",PROPERTY_USAGE_DEFAULT|PROPERTY_USAGE_STORE_IF_NONZERO));
if (!metadata.empty())
p_list->push_back( PropertyInfo( Variant::DICTIONARY, "__meta__", PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR|PROPERTY_USAGE_STORE_IF_NONZERO));
if (script_instance && !p_reversed) {
p_list->push_back( PropertyInfo(Variant::NIL,"Script Variables",PROPERTY_HINT_NONE,String(),PROPERTY_USAGE_CATEGORY));
script_instance->get_property_list(p_list);
}
}
void Object::get_method_list(List<MethodInfo> *p_list) const {
ObjectTypeDB::get_method_list(get_type_name(),p_list);
if (script_instance) {
script_instance->get_method_list(p_list);
}
}
Variant Object::_call_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {
if (p_argcount<1) {
r_error.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
r_error.argument=0;
return Variant();
}
if (p_args[0]->get_type()!=Variant::STRING) {
r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument=0;
r_error.expected=Variant::STRING;
return Variant();
}
StringName method = *p_args[0];
return call(method,&p_args[1],p_argcount-1,r_error);
}
Variant Object::_call_deferred_bind(const Variant** p_args, int p_argcount, Variant::CallError& r_error) {
if (p_argcount<1) {
r_error.error=Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
r_error.argument=0;
return Variant();
}
if (p_args[0]->get_type()!=Variant::STRING) {
r_error.error=Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
r_error.argument=0;
r_error.expected=Variant::STRING;
return Variant();
}
r_error.error=Variant::CallError::CALL_OK;
StringName signal = *p_args[0];
Variant v[VARIANT_ARG_MAX];
for(int i=0;i<MIN(5,p_argcount-1);i++) {
v[i]=*p_args[i+1];
}
call_deferred(signal,v[0],v[1],v[2],v[3],v[4]);
return Variant();
}
#if 0
Variant Object::_call_bind(const StringName& p_name, const Variant& p_arg1, const Variant& p_arg2, const Variant& p_arg3, const Variant& p_arg4) {
ERR_FAIL_COND_V(p_argcount<1,Variant());
return call(p_name, p_arg1, p_arg2, p_arg3, p_arg4);
};
void Object::_call_deferred_bind(const StringName& p_name, const Variant& p_arg1, const Variant& p_arg2, const Variant& p_arg3, const Variant& p_arg4) {
call_deferred(p_name, p_arg1, p_arg2, p_arg3, p_arg4);
};
#endif
#ifdef DEBUG_ENABLED
static bool _test_call_error(const StringName& p_func,const Variant::CallError& error) {
switch(error.error) {
case Variant::CallError::CALL_OK:
return true;
case Variant::CallError::CALL_ERROR_INVALID_METHOD:
return false;
case Variant::CallError::CALL_ERROR_INVALID_ARGUMENT: {
ERR_EXPLAIN("Error Calling Function: "+String(p_func)+" - Invalid type for argument "+itos(error.argument)+", expected "+Variant::get_type_name(error.expected));
ERR_FAIL_V(true);
} break;
case Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS: {
ERR_EXPLAIN("Error Calling Function: "+String(p_func)+" - Too many arguments, expected "+itos(error.argument));
ERR_FAIL_V(true);
} break;
case Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS: {
ERR_EXPLAIN("Error Calling Function: "+String(p_func)+" - Too few arguments, expected "+itos(error.argument));
ERR_FAIL_V(true);
} break;
case Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL: {} //?
}
return true;
}
#else
#define _test_call_error(m_str,m_err) ((m_err.error==Variant::CallError::CALL_ERROR_INVALID_METHOD)?false:true)
#endif
void Object::call_multilevel(const StringName& p_method,const Variant** p_args,int p_argcount) {
if (p_method==CoreStringNames::get_singleton()->_free) {
#ifdef DEBUG_ENABLED
if (cast_to<Reference>()) {
ERR_EXPLAIN("Can't 'free' a reference.");
ERR_FAIL();
return;
}
if (_lock_index.get()>1) {
ERR_EXPLAIN("Object is locked and can't be freed.");
ERR_FAIL();
return;
}
#endif
//must be here, must be before everything,
memdelete(this);
return;
}
//Variant ret;
OBJ_DEBUG_LOCK
Variant::CallError error;
if (script_instance) {
script_instance->call_multilevel(p_method,p_args,p_argcount);
//_test_call_error(p_method,error);
}
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_method);
if (method) {
method->call(this,p_args,p_argcount,error);
_test_call_error(p_method,error);
}
}
void Object::call_multilevel_reversed(const StringName& p_method,const Variant** p_args,int p_argcount) {
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_method);
Variant::CallError error;
OBJ_DEBUG_LOCK
if (method) {
method->call(this,p_args,p_argcount,error);
_test_call_error(p_method,error);
}
//Variant ret;
if (script_instance) {
script_instance->call_multilevel_reversed(p_method,p_args,p_argcount);
//_test_call_error(p_method,error);
}
}
bool Object::has_method(const StringName& p_method) const {
if (p_method==CoreStringNames::get_singleton()->_free) {
return true;
}
if (script_instance && script_instance->has_method(p_method)) {
return true;
}
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_method);
if (method) {
return true;
}
return false;
}
Variant Object::getvar(const Variant& p_key, bool *r_valid) const {
if (r_valid)
*r_valid=false;
return Variant();
}
void Object::setvar(const Variant& p_key, const Variant& p_value,bool *r_valid) {
if (r_valid)
*r_valid=false;
}
Variant Object::callv(const StringName& p_method,const Array& p_args) {
if (p_args.size()==0) {
return call(p_method);
}
Vector<Variant> args;
args.resize(p_args.size());
Vector<const Variant*> argptrs;
argptrs.resize(p_args.size());
for(int i=0;i<p_args.size();i++) {
args[i]=p_args[i];
argptrs[i]=&args[i];
}
Variant::CallError ce;
return call(p_method,argptrs.ptr(),p_args.size(),ce);
}
Variant Object::call(const StringName& p_name, VARIANT_ARG_DECLARE) {
#if 0
if (p_name==CoreStringNames::get_singleton()->_free) {
#ifdef DEBUG_ENABLED
if (cast_to<Reference>()) {
ERR_EXPLAIN("Can't 'free' a reference.");
ERR_FAIL_V(Variant());
}
#endif
//must be here, must be before everything,
memdelete(this);
return Variant();
}
VARIANT_ARGPTRS;
int argc=0;
for(int i=0;i<VARIANT_ARG_MAX;i++) {
if (argptr[i]->get_type()==Variant::NIL)
break;
argc++;
}
Variant::CallError error;
Variant ret;
if (script_instance) {
ret = script_instance->call(p_name,argptr,argc,error);
if (_test_call_error(p_name,error))
return ret;
}
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_name);
if (method) {
Variant ret = method->call(this,argptr,argc,error);
if (_test_call_error(p_name,error))
return ret;
return ret;
} else {
}
return Variant();
#else
VARIANT_ARGPTRS;
int argc=0;
for(int i=0;i<VARIANT_ARG_MAX;i++) {
if (argptr[i]->get_type()==Variant::NIL)
break;
argc++;
}
Variant::CallError error;
Variant ret = call(p_name,argptr,argc,error);
return ret;
#endif
}
void Object::call_multilevel(const StringName& p_name, VARIANT_ARG_DECLARE) {
#if 0
if (p_name==CoreStringNames::get_singleton()->_free) {
#ifdef DEBUG_ENABLED
if (cast_to<Reference>()) {
ERR_EXPLAIN("Can't 'free' a reference.");
ERR_FAIL();
return;
}
#endif
//must be here, must be before everything,
memdelete(this);
return;
}
VARIANT_ARGPTRS;
int argc=0;
for(int i=0;i<VARIANT_ARG_MAX;i++) {
if (argptr[i]->get_type()==Variant::NIL)
break;
argc++;
}
Variant::CallError error;
if (script_instance) {
script_instance->call(p_name,argptr,argc,error);
_test_call_error(p_name,error);
}
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_name);
if (method) {
method->call(this,argptr,argc,error);
_test_call_error(p_name,error);
}
#else
VARIANT_ARGPTRS;
int argc=0;
for(int i=0;i<VARIANT_ARG_MAX;i++) {
if (argptr[i]->get_type()==Variant::NIL)
break;
argc++;
}
//Variant::CallError error;
call_multilevel(p_name,argptr,argc);
#endif
}
Variant Object::call(const StringName& p_method,const Variant** p_args,int p_argcount,Variant::CallError &r_error) {
if (p_method==CoreStringNames::get_singleton()->_free) {
//free must be here, before anything, always ready
#ifdef DEBUG_ENABLED
if (p_argcount!=0) {
r_error.argument=0;
r_error.error=Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
return Variant();
}
if (cast_to<Reference>()) {
r_error.argument=0;
r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
ERR_EXPLAIN("Can't 'free' a reference.");
ERR_FAIL_V(Variant());
}
if (_lock_index.get()>1) {
r_error.argument=0;
r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
ERR_EXPLAIN("Object is locked and can't be freed.");
ERR_FAIL_V(Variant());
}
#endif
//must be here, must be before everything,
memdelete(this);
r_error.error=Variant::CallError::CALL_OK;
return Variant();
}
Variant ret;
OBJ_DEBUG_LOCK
if (script_instance) {
ret = script_instance->call(p_method,p_args,p_argcount,r_error);
//force jumptable
switch(r_error.error) {
case Variant::CallError::CALL_OK:
return ret;
case Variant::CallError::CALL_ERROR_INVALID_METHOD:
break;
case Variant::CallError::CALL_ERROR_INVALID_ARGUMENT:
case Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS:
case Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS:
return ret;
case Variant::CallError::CALL_ERROR_INSTANCE_IS_NULL: {}
}
}
MethodBind *method=ObjectTypeDB::get_method(get_type_name(),p_method);
if (method) {
ret=method->call(this,p_args,p_argcount,r_error);
} else {
r_error.error=Variant::CallError::CALL_ERROR_INVALID_METHOD;
}
return ret;
}
void Object::notification(int p_notification,bool p_reversed) {
_notificationv(p_notification,p_reversed);
if (script_instance) {
script_instance->notification(p_notification);
}
}
void Object::_changed_callback(Object *p_changed,const char *p_prop) {
}
void Object::add_change_receptor( Object *p_receptor ) {
change_receptors.insert(p_receptor);
}
void Object::remove_change_receptor( Object *p_receptor ) {
change_receptors.erase(p_receptor);
}
void Object::property_list_changed_notify() {
_change_notify();
}
void Object::cancel_delete() {
_predelete_ok=true;
}
void Object::set_script(const RefPtr& p_script) {
if (script==p_script)
return;
if (script_instance) {
memdelete(script_instance);
script_instance=NULL;
}
script=p_script;
Ref<Script> s(script);
if (!s.is_null() && s->can_instance() ) {
OBJ_DEBUG_LOCK
script_instance = s->instance_create(this);
}
_change_notify("script/script");
emit_signal(CoreStringNames::get_singleton()->script_changed);
}
void Object::set_script_instance(ScriptInstance *p_instance) {
if (script_instance==p_instance)
return;
if (script_instance)
memdelete(script_instance);
script_instance=p_instance;
script=p_instance->get_script().get_ref_ptr();
}
RefPtr Object::get_script() const {
return script;
}
bool Object::has_meta(const String& p_name) const {
return metadata.has(p_name);
}
void Object::set_meta(const String& p_name, const Variant& p_value ) {
if (p_value.get_type() == Variant::NIL) {
metadata.erase(p_name);
return;
};
metadata[p_name]=p_value;
}
Variant Object::get_meta(const String& p_name) const {
ERR_FAIL_COND_V(!metadata.has(p_name),Variant());
return metadata[p_name];
}