1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
# -*- coding: utf-8 -*-
#
# AWL simulator - datablocks
#
# Copyright 2012-2013 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 awlsim.util import *
from awlsim.operators import *
from awlsim.datatypes import *
from awlsim.datastructure import *
class DB(object):
def __init__(self, index, codeBlock=None):
self.index = index
self.codeBlock = codeBlock # The FB or FC, if this is an instance/bounce-DB.
if self.codeBlock:
# The data structure is declared by the interface.
self.__struct = None
else:
self.__struct = AwlStruct()
self.structInstance = None
@property
def struct(self):
if self.codeBlock:
return self.codeBlock.interface.struct
return self.__struct
def isInstanceDB(self):
return bool(self.codeBlock)
def allocate(self):
self.structInstance = AwlStructInstance(self.struct)
def fetch(self, operator):
return AwlOperator.fetchFromByteArray(self.structInstance.dataBytes,
operator)
def store(self, operator, value):
AwlOperator.storeToByteArray(self.structInstance.dataBytes,
operator, value)
def __repr__(self):
return "DB %d" % self.index
|
