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# -*- coding: utf-8 -*-
#
# AWL simulator - CPU call stack
# Copyright 2012-2013 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
from awldatatypes import *
from awlstatusword import *
from awlparameters import *
from objectcache import *
from util import *
class CallStackElem(object):
"Call stack element"
localdataCache = ObjectCache(lambda cpu:
[ LocalByte()
for _ in range(cpu.specs.getNrLocalbytes()) ]
)
@classmethod
def resetCache(cls):
cls.localdataCache.reset()
def __init__(self, cpu, block, instanceDB=None,
interfaceDB=None, parameters=()):
self.cpu = cpu
self.status = S7StatusWord()
self.parenStack = []
self.ip = 0
self.localdata = self.localdataCache.get(cpu)
self.block = block
self.instanceDB = instanceDB
self.interfaceDB = interfaceDB if interfaceDB else instanceDB
self.inboundParams = [ param for param in parameters
if param.isInbound(block.interface) ]
self.outboundParams = [ param for param in parameters
if param.isOutbound(block.interface) ]
self.handleInParameters()
# Keep a reference to the instructions and labels list locally.
self.insns = self.block.insns
self.labels = self.block.labels
# Transfer data into DBI
def handleInParameters(self):
for param in self.inboundParams:
self.interfaceDB.structInstance.setFieldData(
param.lvalueName,
self.cpu.fetch(param.rvalueOp)
)
# Transfer data out of DBI
def handleOutParameters(self):
for param in self.outboundParams:
self.cpu.store(
param.rvalueOp,
self.interfaceDB.structInstance.getFieldData(param.lvalueName)
)
def destroy(self):
# Only put it back into the cache, if the size didn't change.
if len(self.localdata) == self.cpu.specs.getNrLocalbytes():
self.localdataCache.put(self.localdata)
self.localdata = None
def __repr__(self):
return str(self.block)
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