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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 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, db):
self.cpu = cpu
self.status = S7StatusWord()
self.parenStack = []
self.ip = 0
self.localdata = self.localdataCache.get(cpu)
assert(len(self.localdata) == cpu.specs.getNrLocalbytes())
self.block = block
self.db = db
@property
def insns(self):
return self.block.insns
@property
def labels(self):
return self.block.labels
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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