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LibrePilot/flight/libraries/PyMite/vm/frame.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__ 0x03
/**
* \file
* \brief VM Frame
*
* VM frame operations.
*/
#include "pm.h"
PmReturn_t
frame_new(pPmObj_t pfunc, pPmObj_t *r_pobj)
{
PmReturn_t retval = PM_RET_OK;
int16_t fsize = 0;
pPmCo_t pco = C_NULL;
pPmFrame_t pframe = C_NULL;
uint8_t *pchunk;
/* Get fxn's code obj */
pco = ((pPmFunc_t)pfunc)->f_co;
/* TypeError if passed func's CO is not a true COB */
if (OBJ_GET_TYPE(pco) != OBJ_TYPE_COB)
{
PM_RAISE(retval, PM_RET_EX_TYPE);
return retval;
}
#ifdef HAVE_GENERATORS
/* #207: Initializing a Generator using CALL_FUNC needs extra stack slot */
fsize = sizeof(PmFrame_t) + (pco->co_stacksize + pco->co_nlocals + 2) * sizeof(pPmObj_t);
#elif defined(HAVE_CLASSES)
/* #230: Calling a class's __init__() takes two extra spaces on the stack */
fsize = sizeof(PmFrame_t) + (pco->co_stacksize + pco->co_nlocals + 1) * sizeof(pPmObj_t);
#else
fsize = sizeof(PmFrame_t) + (pco->co_stacksize + pco->co_nlocals - 1) * sizeof(pPmObj_t);
#endif /* HAVE_CLASSES */
#ifdef HAVE_CLOSURES
/* #256: Add support for closures */
fsize = fsize + pco->co_nfreevars
+ ((pco->co_cellvars == C_NULL) ? 0 : pco->co_cellvars->length);
#endif /* HAVE_CLOSURES */
/* Allocate a frame */
retval = heap_getChunk(fsize, &pchunk);
PM_RETURN_IF_ERROR(retval);
pframe = (pPmFrame_t)pchunk;
/* Set frame fields */
OBJ_SET_TYPE(pframe, OBJ_TYPE_FRM);
pframe->fo_back = C_NULL;
pframe->fo_func = (pPmFunc_t)pfunc;
pframe->fo_memspace = pco->co_memspace;
/* Init instruction pointer and block stack */
pframe->fo_ip = pco->co_codeaddr;
pframe->fo_blockstack = C_NULL;
/* Get globals and attrs from the function object */
pframe->fo_globals = ((pPmFunc_t)pfunc)->f_globals;
pframe->fo_attrs = ((pPmFunc_t)pfunc)->f_attrs;
#ifndef HAVE_CLOSURES
/* Empty stack points to one past locals */
pframe->fo_sp = &(pframe->fo_locals[pco->co_nlocals]);
#else
/* #256: Add support for closures */
pframe->fo_sp = &(pframe->fo_locals[pco->co_nlocals + pco->co_nfreevars
+ ((pco->co_cellvars == C_NULL) ? 0 : pco->co_cellvars->length)]);
#endif /* HAVE_CLOSURES */
/* By default, this is a normal frame, not an import or __init__ one */
pframe->fo_isImport = 0;
#ifdef HAVE_CLASSES
pframe->fo_isInit = 0;
#endif
/* Clear the stack */
sli_memset((unsigned char *)&(pframe->fo_locals), (char const)0,
(unsigned int)fsize - sizeof(PmFrame_t));
/* Return ptr to frame */
*r_pobj = (pPmObj_t)pframe;
return retval;
}