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# -*- coding: utf-8 -*-
#
# AWL simulator - Parenthesis stack
#
# Copyright 2012-2018 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
from awlsim.common.cpuspecs import * #+cimport
from awlsim.common.cpuconfig import *
from awlsim.common.exceptions import *
from awlsim.common.util import *
from awlsim.core.cpu import * #+cimport
from awlsim.core.statusword import * #+cimport
#from cpython.mem cimport PyMem_Malloc, PyMem_Free #@cy
class ParenStackElem(object): #@nocy
"Parenthesis stack (Klammerstack) element." #@nocy
__slots__ = ( #@nocy
"insnType", #@nocy
"NER", #@nocy
"VKE", #@nocy
"OR", #@nocy
) #@nocy
class ParenStack(object): #+cdef
"""Parenthesis stack (Klammerstack).
"""
__slots__ = (
"cpu",
"maxNrElements",
"nrElements",
"elements",
)
def push(self, insnType, statusWord): #@nocy
#@cy cdef push(self, uint8_t insnType, S7StatusWord statusWord):
"""Push a new element onto the parenthesis stack.
"""
#@cy cdef ParenStackElem *pse
if self.nrElements >= self.maxNrElements:
raise AwlSimError("Parenthesis stack overflow")
pse = ParenStackElem() #@nocy
#@cy pse = &(self.elements[self.nrElements])
pse.insnType = insnType
pse.NER = statusWord.NER
pse.VKE = statusWord.VKE
pse.OR = statusWord.OR
# Append the element to the stack.
self.nrElements += 1
self.elements.append(pse) #@nocy
def pop(self): #@nocy
#@cy cdef ParenStackElem pop(self):
"""Pop the newest element off the parenthesis stack.
"""
if self.nrElements <= 0:
raise AwlSimError("Parenthesis stack underflow")
# Remove the element from the stack.
self.nrElements -= 1
return self.elements.pop() #@nocy
#@cy return self.elements[self.nrElements]
def __str__(self):
mnemonics = self.cpu.getMnemonics()
type2name = {
S7CPUConfig.MNEMONICS_EN : AwlInsn.type2name_english,
S7CPUConfig.MNEMONICS_DE : AwlInsn.type2name_german,
}[mnemonics]
return ", ".join(
'(insn="%s" VKE=%s OR=%d)' % (
type2name[self.elements[i].insnType],
self.elements[i].VKE,
self.elements[i].OR,
) for i in range(self.nrElements)
)
#@cy def __dealloc__(self):
#@cy PyMem_Free(self.elements)
#@cy self.elements = NULL
def make_ParenStack(cpu): #@nocy
#cdef ParenStack make_ParenStack(S7CPU cpu): #@cy
#@cy cdef ParenStack ps
ps = ParenStack()
ps.cpu = cpu
ps.maxNrElements = cpu.specs.parenStackSize
ps.nrElements = 0
ps.elements = [] #@nocy
#@cy ps.elements = <ParenStackElem *>PyMem_Malloc(ps.maxNrElements * sizeof(ParenStackElem))
#@cy if ps.elements == NULL:
#@cy raise AwlSimError("make_ParenStack: Out of memory")
return ps
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