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LibrePilot/flight/libraries/PyMite/vm/class.c

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/*
# This file is Copyright 2009, 2010 Dean Hall.
#
# This file is part of the PyMite VM.
# The PyMite VM is free software: you can redistribute it and/or modify
# it under the terms of the GNU GENERAL PUBLIC LICENSE Version 2.
#
# The PyMite VM is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# A copy of the GNU GENERAL PUBLIC LICENSE Version 2
# is seen in the file COPYING in this directory.
*/
#undef __FILE_ID__
#define __FILE_ID__ 0x18
/**
* \file
* \brief Class Object Type
*
* Class object type operations.
*/
#include "pm.h"
PmReturn_t
class_new(pPmObj_t pattrs, pPmObj_t pbases, pPmObj_t pname, pPmObj_t *r_pclass)
{
PmReturn_t retval = PM_RET_OK;
uint8_t *pchunk;
pPmObj_t pobj;
/* Ensure types */
if ((OBJ_GET_TYPE(pattrs) != OBJ_TYPE_DIC)
|| (OBJ_GET_TYPE(pbases) != OBJ_TYPE_TUP)
|| (OBJ_GET_TYPE(pname) != OBJ_TYPE_STR))
{
PM_RAISE(retval, PM_RET_EX_TYPE);
return retval;
}
/* Allocate a class obj */
retval = heap_getChunk(sizeof(PmClass_t), &pchunk);
PM_RETURN_IF_ERROR(retval);
pobj = (pPmObj_t)pchunk;
OBJ_SET_TYPE(pobj, OBJ_TYPE_CLO);
/* Class has no access to its CO */
((pPmClass_t)pobj)->cl_attrs = (pPmDict_t)pattrs;
((pPmClass_t)pobj)->cl_bases = (pPmTuple_t)pbases;
*r_pclass = pobj;
return retval;
}
/* Returns an instance of the class by reference */
PmReturn_t
class_instantiate(pPmObj_t pclass, pPmObj_t *r_pobj)
{
PmReturn_t retval = PM_RET_OK;
uint8_t *pchunk;
pPmObj_t pobj;
pPmObj_t pattrs;
uint8_t objid;
/* Allocate a class instance */
retval = heap_getChunk(sizeof(PmInstance_t), &pchunk);
PM_RETURN_IF_ERROR(retval);
pobj = (pPmObj_t)pchunk;
OBJ_SET_TYPE(pobj, OBJ_TYPE_CLI);
/* Set the instance's class */
((pPmInstance_t)pobj)->cli_class = (pPmClass_t)pclass;
/* Create the attributes dict */
heap_gcPushTempRoot(pobj, &objid);
retval = dict_new(&pattrs);
heap_gcPopTempRoot(objid);
((pPmInstance_t)pobj)->cli_attrs = (pPmDict_t)pattrs;
/* TODO: Store pclass in __class__ attr */
*r_pobj = pobj;
return retval;
}
PmReturn_t
class_method(pPmObj_t pinstance, pPmObj_t pfunc, pPmObj_t *r_pmeth)
{
PmReturn_t retval = PM_RET_OK;
uint8_t *pchunk;
pPmMethod_t pmeth;
pPmObj_t pattrs;
uint8_t objid;
/* Allocate a method */
retval = heap_getChunk(sizeof(PmMethod_t), &pchunk);
PM_RETURN_IF_ERROR(retval);
OBJ_SET_TYPE(pchunk, OBJ_TYPE_MTH);
/* Set method fields */
pmeth = (pPmMethod_t)pchunk;
pmeth->m_instance = (pPmInstance_t)pinstance;
pmeth->m_func = (pPmFunc_t)pfunc;
/* Create the attributes dict */
heap_gcPushTempRoot((pPmObj_t)pmeth, &objid);
retval = dict_new(&pattrs);
heap_gcPopTempRoot(objid);
pmeth->m_attrs = (pPmDict_t)pattrs;
*r_pmeth = (pPmObj_t)pmeth;
return retval;
}
PmReturn_t
class_getAttr(pPmObj_t pobj, pPmObj_t pname, pPmObj_t *r_pobj)
{
PmReturn_t retval;
uint16_t i;
pPmObj_t pparent;
/* If the given obj is an instance, check its attrs */
if (OBJ_GET_TYPE(pobj) == OBJ_TYPE_CLI)
{
retval = dict_getItem((pPmObj_t)((pPmInstance_t)pobj)->cli_attrs, pname,
r_pobj);
if (retval == PM_RET_OK)
{
return retval;
}
/* Otherwise, check the instance's class */
pobj = (pPmObj_t)((pPmInstance_t)pobj)->cli_class;
}
C_ASSERT(OBJ_GET_TYPE(pobj) == OBJ_TYPE_CLO);
retval = dict_getItem((pPmObj_t)((pPmClass_t)pobj)->cl_attrs, pname,
r_pobj);
/* If attr is not found, search parent(s) */
if ((retval == PM_RET_EX_KEY) && (((pPmClass_t)pobj)->cl_bases != C_NULL))
{
for (i = 0; i < ((pPmClass_t)pobj)->cl_bases->length; i++)
{
pparent = ((pPmClass_t)pobj)->cl_bases->val[i];
retval = class_getAttr(pparent, pname, r_pobj);
if (retval == PM_RET_OK)
{
break;
}
}
}
return retval;
}
uint8_t /* boolean */
class_isSubclass(pPmObj_t ptest_class, pPmObj_t pbase_class)
{
uint8_t i;
uint8_t retval;
retval = C_FALSE;
if (ptest_class == pbase_class)
{
return C_TRUE;
}
/* Recursively check if test class has a matching base class */
if (((pPmClass_t)ptest_class)->cl_bases != C_NULL)
{
for (i = 0; i < ((pPmClass_t)ptest_class)->cl_bases->length; i++)
{
retval = class_isSubclass(((pPmClass_t)ptest_class)->cl_bases->val[i],
pbase_class);
if (retval)
{
break;
}
}
}
return retval;
}