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# -*- coding: utf-8 -*-
#
# AWL simulator - PLC core server memory area helpers
#
# Copyright 2013-2018 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.enumeration import *
from awlsim.common.util import *
from awlsim.common.exceptions import *
from awlsim.common.wordpacker import *
from awlsim.core.cpu import * #+cimport
from awlsim.core.memory import * #+cimport
from awlsim.core.offset import * #+cimport
from awlsim.core.datablocks import * #+cimport
from awlsim.core.timers import * #+cimport
from awlsim.core.counters import * #+cimport
from awlsim.core.statusword import * #+cimport
class MemoryArea(object):
# Possible memType values
EnumGen.start
TYPE_E = EnumGen.item # input memory
TYPE_A = EnumGen.item # output memory
TYPE_M = EnumGen.item # flags memory
TYPE_L = EnumGen.item # localdata memory
TYPE_DB = EnumGen.item # DB memory
TYPE_T = EnumGen.item # timer
TYPE_Z = EnumGen.item # counter
TYPE_STW = EnumGen.item # status word
EnumGen.end
# Possible flags
FLG_ERR_READ = 0x01
FLG_ERR_WRITE = 0x02
def __init__(self, memType, flags, index, start, length, data=b''):
self.memType = memType
self.flags = flags
self.index = index
self.start = start
self.length = length
if isinstance(data, bytes):
# Python 2 compatibility: Convert data to bytearray to avoid
# incompatibility with self.data indexing:
# Py2: bytes[x] -> str/bytes
# Py3: bytes[x] -> int
data = bytearray(data)
self.data = data
def __raiseReadErr(self, exception):
self.flags |= self.FLG_ERR_READ
raise exception
def __raiseWriteErr(self, exception):
self.flags |= self.FLG_ERR_WRITE
raise exception
def __memoryRead(self, memory): #@nocy
#@cy def __memoryRead(self, AwlMemory memory):
#@cy cdef AwlMemoryObject memObj
try:
if (not (0 <= self.start <= 0xFFFF) or
self.length not in (1, 2, 4)):
raise ValueError
memObj = memory.fetch(make_AwlOffset(self.start, 0),
self.length * 8)
except (AwlSimError, ValueError) as e:
self.__raiseReadErr(
AwlSimError("MemoryArea: Read range error")
)
self.data = AwlMemoryObject_asBytes(memObj)[:]
def __read_E(self, cpu): #@nocy
#@cy def __read_E(self, S7CPU cpu):
self.__memoryRead(cpu.inputs)
def __read_A(self, cpu): #@nocy
#@cy def __read_A(self, S7CPU cpu):
self.__memoryRead(cpu.outputs)
def __read_M(self, cpu): #@nocy
#@cy def __read_M(self, S7CPU cpu):
self.__memoryRead(cpu.flags)
def __read_L(self, cpu): #@nocy
#@cy def __read_L(self, S7CPU cpu):
#TODO use self.index to select which L-stack we want to access.
if not cpu.activeLStack:
self.__raiseReadErr(
AwlSimError("MemoryArea: No active L-stack")
)
self.__memoryRead(cpu.activeLStack.memory)
def __read_DB(self, cpu): #@nocy
#@cy def __read_DB(self, S7CPU cpu):
#@cy cdef DB db
db = cpu.getDB(self.index)
if not db:
self.__raiseReadErr(
AwlSimError("MemoryArea: Read access to "
"nonexistent DB %d" % self.index)
)
if not (db.permissions & db.PERM_READ):
self.__raiseReadErr(
AwlSimError("MemoryArea: Read access to "
"read-protected DB %d" % self.index)
)
self.__memoryRead(db.structInstance.memory)
def __read_T(self, cpu): #@nocy
#@cy def __read_T(self, S7CPU cpu):
#@cy cdef Timer timer
try:
timer = cpu.timers[self.index]
except IndexError as e:
self.__raiseReadErr(
AwlSimError("MemoryArea: Invalid timer index %d" % self.index)
)
v = (timer.get() << 31) | timer.getTimevalS5TwithBase()
self.data = WordPacker.toBytes(bytearray(4), 32, 0, v)
self.length = 4
def __read_Z(self, cpu): #@nocy
#@cy def __read_Z(self, S7CPU cpu):
#@cy cdef Counter counter
try:
counter = cpu.counters[self.index]
except IndexError as e:
self.__raiseReadErr(
AwlSimError("MemoryArea: Invalid counter index %d" % self.index)
)
v = (counter.get() << 31) | counter.getValueBCD()
self.data = WordPacker.toBytes(bytearray(4), 32, 0, v)
self.length = 4
def __read_STW(self, cpu): #@nocy
#@cy def __read_STW(self, S7CPU cpu):
#@cy cdef S7StatusWord s
s = cpu.statusWord
stw = s.getWord()
self.data, self.length = bytearray(((stw >> 8) & 0xFF, stw & 0xFF)), 2
__readHandlers = {
TYPE_E : __read_E,
TYPE_A : __read_A,
TYPE_M : __read_M,
TYPE_L : __read_L,
TYPE_DB : __read_DB,
TYPE_T : __read_T,
TYPE_Z : __read_Z,
TYPE_STW : __read_STW,
}
def __memoryWrite(self, memory): #@nocy
#@cy def __memoryWrite(self, AwlMemory memory):
#@cy cdef AwlMemoryObject memObj
try:
if (not (0 <= self.start <= 0xFFFF) or
self.length not in (1, 2, 4) or
self.length != len(self.data)):
raise ValueError
memObj = make_AwlMemoryObject_fromBytes(self.data,
self.length * 8)
memory.store(make_AwlOffset(self.start, 0),
memObj)
except (AwlSimError, ValueError) as e:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Write range error")
)
def __write_E(self, cpu): #@nocy
#@cy def __write_E(self, S7CPU cpu):
self.__memoryWrite(cpu.inputs)
def __write_A(self, cpu): #@nocy
#@cy def __write_A(self, S7CPU cpu):
self.__memoryWrite(cpu.outputs)
def __write_M(self, cpu): #@nocy
#@cy def __write_M(self, S7CPU cpu):
self.__memoryWrite(cpu.flags)
def __write_DB(self, cpu): #@nocy
#@cy def __write_DB(self, S7CPU cpu):
#@cy cdef DB db
db = cpu.getDB(self.index)
if not db:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Write access to "
"nonexistent DB %d" % self.index)
)
if not (db.permissions & db.PERM_WRITE):
self.__raiseWriteErr(
AwlSimError("MemoryArea: Write access to "
"write-protected DB %d" % self.index)
)
self.__memoryWrite(db.structInstance.memory)
def __write_T(self, cpu): #@nocy
#@cy def __write_T(self, S7CPU cpu):
#@cy cdef Timer timer
try:
timer = cpu.timers[self.index]
except IndexError as e:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Invalid timer index %d" % self.index)
)
try:
if (self.length not in (2, 4) or
self.length != len(self.data)):
raise ValueError
dword = WordPacker.fromBytes(self.data, self.length * 8, 0)
timer.setTimevalS5T(dword & 0xFFFF)
except (ValueError, AwlSimError) as e:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Timer value error")
)
def __write_Z(self, cpu): #@nocy
#@cy def __write_Z(self, S7CPU cpu):
#@cy cdef Counter counter
try:
counter = cpu.counters[self.index]
except IndexError as e:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Invalid counter index %d" % self.index)
)
try:
if (self.length not in (2, 4) or
self.length != len(self.data)):
raise ValueError
dword = WordPacker.fromBytes(self.data, self.length * 8, 0)
counter.setValueBCD(dword & 0xFFFF)
except (ValueError, AwlSimError) as e:
self.__raiseWriteErr(
AwlSimError("MemoryArea: Counter value error")
)
__writeHandlers = {
TYPE_E : __write_E,
TYPE_A : __write_A,
TYPE_M : __write_M,
TYPE_DB : __write_DB,
TYPE_T : __write_T,
TYPE_Z : __write_Z,
}
def readFromCpu(self, cpu):
try:
self.__readHandlers[self.memType](self, cpu)
except KeyError:
self.__raiseReadErr(
AwlSimError("Invalid MemoryArea memType %d "
"in read operation" % self.memType)
)
except (IndexError, TypeError) as e:
self.__raiseReadErr(
AwlSimError("Invalid MemoryArea read")
)
def writeToCpu(self, cpu):
try:
self.__writeHandlers[self.memType](self, cpu)
except KeyError:
self.__raiseWriteErr(
AwlSimError("Invalid MemoryArea memType %d "
"in write operation" % self.memType)
)
except (IndexError, TypeError) as e:
self.__raiseWriteErr(
AwlSimError("Invalid MemoryArea write")
)
# Check whether another area overlaps with this one.
# Doesn't compare the flags.
# Doesn't compare the data.
def overlapsWith(self, other):
if self.memType != other.memType or\
self.index != other.index:
return False
if self.memType in (self.TYPE_T, self.TYPE_Z, self.TYPE_STW):
return self.start == other.start and\
self.length == other.length
if self.length and other.length:
selfEnd = self.start + self.length - 1
otherEnd = other.start + other.length - 1
if selfEnd < other.start or\
otherEnd < self.start:
return False
elif self.length != other.length:
return False # One length is zero and the other isn't
return True
def overlapsWithAny(self, otherMemAreas):
return any(self.overlapsWith(a) for a in otherMemAreas)
def __repr__(self):
return "MemoryArea(memType=%d, flags=0x%02X, index=%d, "\
"start=%d, length=%d, len(data)=%s)" %\
(self.memType, self.flags, self.index,
self.start, self.length,
str(len(self.data)) if self.data is not None else "None")
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