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

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/*
# This file is Copyright 2003, 2006, 2007, 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__ 0x0F
/**
* \file
* \brief Object Type
*
* Object type operations.
*/
#include "pm.h"
PmReturn_t
obj_loadFromImg(PmMemSpace_t memspace,
uint8_t const **paddr, pPmObj_t *r_pobj)
{
PmReturn_t retval = PM_RET_OK;
PmObj_t obj;
/* Get the object descriptor */
obj.od = (PmObjDesc_t)0x0000;
OBJ_SET_TYPE(&obj, mem_getByte(memspace, paddr));
switch (OBJ_GET_TYPE(&obj))
{
case OBJ_TYPE_NON:
/* If it's the None object, return global None */
*r_pobj = PM_NONE;
break;
case OBJ_TYPE_INT:
/* Read an integer and create an integer object with the value */
retval = int_new(mem_getInt(memspace, paddr), r_pobj);
break;
#ifdef HAVE_FLOAT
case OBJ_TYPE_FLT:
/* Read a float and create an float object with the value */
retval = float_new(mem_getFloat(memspace, paddr), r_pobj);
break;
#endif /* HAVE_FLOAT */
case OBJ_TYPE_STR:
retval = string_loadFromImg(memspace, paddr, r_pobj);
break;
case OBJ_TYPE_TUP:
retval = tuple_loadFromImg(memspace, paddr, r_pobj);
break;
case OBJ_TYPE_NIM:
/* If it's a native code img, load into a code obj */
retval = no_loadFromImg(memspace, paddr, r_pobj);
break;
case OBJ_TYPE_CIM:
/* If it's a code img, load into a code obj */
retval = co_loadFromImg(memspace, paddr, r_pobj);
break;
default:
/* All other types should not be in an img obj */
PM_RAISE(retval, PM_RET_EX_SYS);
break;
}
return retval;
}
PmReturn_t
obj_loadFromImgObj(pPmObj_t pimg, pPmObj_t *r_pobj)
{
uint8_t const *imgaddr;
PmReturn_t retval;
C_ASSERT(OBJ_GET_TYPE(pimg) == OBJ_TYPE_CIO);
imgaddr = (uint8_t const *)&(((pPmCodeImgObj_t)pimg)->val);
retval = obj_loadFromImg(MEMSPACE_RAM, &imgaddr, r_pobj);
C_ASSERT(OBJ_GET_TYPE(*r_pobj) == OBJ_TYPE_COB);
/* All COs must reference the top of the code img obj
* so the image is marked and prevented from being reclaimed */
co_rSetCodeImgAddr((pPmCo_t)*r_pobj, (uint8_t const *)pimg);
return retval;
}
/* Returns true if the obj is false */
int8_t
obj_isFalse(pPmObj_t pobj)
{
C_ASSERT(pobj != C_NULL);
switch (OBJ_GET_TYPE(pobj))
{
case OBJ_TYPE_NON:
/* None evaluates to false, so return true */
return C_TRUE;
case OBJ_TYPE_INT:
/* Only the integer zero is false */
return ((pPmInt_t)pobj)->val == 0;
#ifdef HAVE_FLOAT
case OBJ_TYPE_FLT:
/* The floats 0.0 and -0.0 are false */
return (((pPmFloat_t) pobj)->val == 0.0)
|| (((pPmFloat_t) pobj)->val == -0.0);
#endif /* HAVE_FLOAT */
case OBJ_TYPE_STR:
/* An empty string is false */
return ((pPmString_t)pobj)->length == 0;
case OBJ_TYPE_TUP:
/* An empty tuple is false */
return ((pPmTuple_t)pobj)->length == 0;
case OBJ_TYPE_LST:
/* An empty list is false */
return ((pPmList_t)pobj)->length == 0;
case OBJ_TYPE_DIC:
/* An empty dict is false */
return ((pPmDict_t)pobj)->length == 0;
case OBJ_TYPE_BOOL:
/* C int zero means false */
return ((pPmBoolean_t) pobj)->val == 0;
default:
/*
* The following types are always not false:
* CodeObj, Function, Module, Class, ClassInstance.
*/
return C_FALSE;
}
}
/* Returns true if the item is in the container object */
PmReturn_t
obj_isIn(pPmObj_t pobj, pPmObj_t pitem)
{
PmReturn_t retval = PM_RET_NO;
pPmObj_t ptestItem;
int16_t i;
uint8_t c;
switch (OBJ_GET_TYPE(pobj))
{
case OBJ_TYPE_TUP:
/* Iterate over tuple to find item */
for (i = 0; i < ((pPmTuple_t)pobj)->length; i++)
{
PM_RETURN_IF_ERROR(tuple_getItem(pobj, i, &ptestItem));
if (obj_compare(pitem, ptestItem) == C_SAME)
{
retval = PM_RET_OK;
break;
}
}
break;
case OBJ_TYPE_STR:
/* Raise a TypeError if item is not a string */
if ((OBJ_GET_TYPE(pitem) != OBJ_TYPE_STR))
{
retval = PM_RET_EX_TYPE;
break;
}
/* Empty string is alway present */
if (((pPmString_t)pitem)->length == 0)
{
retval = PM_RET_OK;
break;
}
/* Raise a ValueError if the string is more than 1 char */
else if (((pPmString_t)pitem)->length != 1)
{
retval = PM_RET_EX_VAL;
break;
}
/* Iterate over string to find char */
c = ((pPmString_t)pitem)->val[0];
for (i = 0; i < ((pPmString_t)pobj)->length; i++)
{
if (c == ((pPmString_t)pobj)->val[i])
{
retval = PM_RET_OK;
break;
}
}
break;
case OBJ_TYPE_LST:
/* Iterate over list to find item */
for (i = 0; i < ((pPmList_t)pobj)->length; i++)
{
PM_RETURN_IF_ERROR(list_getItem(pobj, i, &ptestItem));
if (obj_compare(pitem, ptestItem) == C_SAME)
{
retval = PM_RET_OK;
break;
}
}
break;
case OBJ_TYPE_DIC:
/* Check if the item is one of the keys of the dict */
retval = dict_getItem(pobj, pitem, &ptestItem);
if (retval == PM_RET_EX_KEY)
{
retval = PM_RET_NO;
}
break;
default:
retval = PM_RET_EX_TYPE;
break;
}
return retval;
}
int8_t
obj_compare(pPmObj_t pobj1, pPmObj_t pobj2)
{
#ifdef HAVE_BYTEARRAY
PmReturn_t retval;
pPmObj_t pobj;
#endif /* HAVE_BYTEARRAY */
C_ASSERT(pobj1 != C_NULL);
C_ASSERT(pobj2 != C_NULL);
/* Check if pointers are same */
if (pobj1 == pobj2)
{
return C_SAME;
}
/* If types are different, objs must differ */
if (OBJ_GET_TYPE(pobj1) != OBJ_GET_TYPE(pobj2))
{
return C_DIFFER;
}
#ifdef HAVE_BYTEARRAY
/* If object is an instance, get the thing it contains */
if (OBJ_GET_TYPE(pobj1) == OBJ_TYPE_CLI)
{
retval = dict_getItem((pPmObj_t)((pPmInstance_t)pobj1)->cli_attrs,
PM_NONE,
&pobj);
PM_RETURN_IF_ERROR(retval);
pobj1 = pobj;
}
if (OBJ_GET_TYPE(pobj2) == OBJ_TYPE_CLI)
{
retval = dict_getItem((pPmObj_t)((pPmInstance_t)pobj2)->cli_attrs,
PM_NONE,
&pobj);
PM_RETURN_IF_ERROR(retval);
pobj2 = pobj;
}
/* If types are different, objs must differ */
if (OBJ_GET_TYPE(pobj1) != OBJ_GET_TYPE(pobj2))
{
return C_DIFFER;
}
#endif /* HAVE_BYTEARRAY */
/* Otherwise handle types individually */
switch (OBJ_GET_TYPE(pobj1))
{
case OBJ_TYPE_NON:
return C_SAME;
case OBJ_TYPE_INT:
return ((pPmInt_t)pobj1)->val ==
((pPmInt_t)pobj2)->val ? C_SAME : C_DIFFER;
#ifdef HAVE_FLOAT
case OBJ_TYPE_FLT:
{
pPmObj_t r_pobj;
float_compare(pobj1, pobj2, &r_pobj, COMP_EQ);
return (r_pobj == PM_TRUE) ? C_SAME : C_DIFFER;
}
#endif /* HAVE_FLOAT */
case OBJ_TYPE_STR:
return string_compare((pPmString_t)pobj1, (pPmString_t)pobj2);
case OBJ_TYPE_TUP:
case OBJ_TYPE_LST:
#ifdef HAVE_BYTEARRAY
case OBJ_TYPE_BYA:
#endif /* HAVE_BYTEARRAY */
return seq_compare(pobj1, pobj2);
case OBJ_TYPE_DIC:
/* #17: PyMite does not support Dict comparisons (yet) */
default:
break;
}
/* All other types would need same pointer to be true */
return C_DIFFER;
}
#ifdef HAVE_PRINT
PmReturn_t
obj_print(pPmObj_t pobj, uint8_t is_expr_repr, uint8_t is_nested)
{
PmReturn_t retval = PM_RET_OK;
C_ASSERT(pobj != C_NULL);
/* Something gets printed unless it's None in an unnested expression */
if (!((OBJ_GET_TYPE(pobj) == OBJ_TYPE_NON) && is_expr_repr && !is_nested))
{
gVmGlobal.somethingPrinted = C_TRUE;
}
switch (OBJ_GET_TYPE(pobj))
{
case OBJ_TYPE_NON:
if (!is_expr_repr || is_nested)
{
plat_putByte('N');
plat_putByte('o');
plat_putByte('n');
retval = plat_putByte('e');
}
break;
case OBJ_TYPE_INT:
retval = int_print(pobj);
break;
#ifdef HAVE_FLOAT
case OBJ_TYPE_FLT:
retval = float_print(pobj);
break;
#endif /* HAVE_FLOAT */
case OBJ_TYPE_STR:
retval = string_print(pobj, (is_expr_repr || is_nested));
break;
case OBJ_TYPE_TUP:
retval = tuple_print(pobj);
break;
case OBJ_TYPE_LST:
retval = list_print(pobj);
break;
case OBJ_TYPE_DIC:
retval = dict_print(pobj);
break;
case OBJ_TYPE_BOOL:
if (((pPmBoolean_t) pobj)->val == C_TRUE)
{
plat_putByte('T');
plat_putByte('r');
plat_putByte('u');
}
else
{
plat_putByte('F');
plat_putByte('a');
plat_putByte('l');
plat_putByte('s');
}
retval = plat_putByte('e');
break;
case OBJ_TYPE_CLI:
#ifdef HAVE_BYTEARRAY
{
pPmObj_t pobj2;
retval = dict_getItem((pPmObj_t)((pPmInstance_t)pobj)->cli_attrs,
PM_NONE,
(pPmObj_t *)&pobj2);
if ((retval == PM_RET_OK)
&& (OBJ_GET_TYPE(pobj2) == OBJ_TYPE_BYA))
{
retval = bytearray_print(pobj2);
break;
}
}
#endif /* HAVE_BYTEARRAY */
case OBJ_TYPE_COB:
case OBJ_TYPE_MOD:
case OBJ_TYPE_CLO:
case OBJ_TYPE_FXN:
case OBJ_TYPE_CIM:
case OBJ_TYPE_NIM:
case OBJ_TYPE_NOB:
case OBJ_TYPE_THR:
case OBJ_TYPE_CIO:
case OBJ_TYPE_MTH:
case OBJ_TYPE_SQI:
plat_putByte('<');
plat_putByte('o');
plat_putByte('b');
plat_putByte('j');
plat_putByte(' ');
plat_putByte('t');
plat_putByte('y');
plat_putByte('p');
plat_putByte('e');
plat_putByte(' ');
plat_putByte('0');
plat_putByte('x');
int_printHexByte(OBJ_GET_TYPE(pobj));
plat_putByte(' ');
plat_putByte('@');
plat_putByte(' ');
plat_putByte('0');
plat_putByte('x');
_int_printHex((intptr_t)pobj);
retval = plat_putByte('>');
break;
default:
/* Otherwise raise a TypeError */
PM_RAISE(retval, PM_RET_EX_TYPE);
break;
}
return retval;
}
#endif /* HAVE_PRINT */
#ifdef HAVE_BACKTICK
PmReturn_t
obj_repr(pPmObj_t pobj, pPmObj_t *r_pstr)
{
uint8_t tBuffer[32];
uint8_t bytesWritten = 0;
PmReturn_t retval = PM_RET_OK;
uint8_t const *pcstr = (uint8_t *)tBuffer;;
C_ASSERT(pobj != C_NULL);
switch (OBJ_GET_TYPE(pobj))
{
case OBJ_TYPE_INT:
bytesWritten = snprintf((char *)&tBuffer, sizeof(tBuffer), "%li",
(long)((pPmInt_t)pobj)->val);
retval = string_new(&pcstr, r_pstr);
break;
#ifdef HAVE_FLOAT
case OBJ_TYPE_FLT:
bytesWritten = snprintf((char *)&tBuffer, sizeof(tBuffer), "%f",
((pPmFloat_t)pobj)->val);
retval = string_new(&pcstr, r_pstr);
break;
#endif /* HAVE_FLOAT */
default:
/* Otherwise raise a TypeError */
PM_RAISE(retval, PM_RET_EX_TYPE);
break;
}
/* Sanity check */
C_ASSERT(bytesWritten < sizeof(tBuffer));
return retval;
}
#endif /* HAVE_BACKTICK */