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# -*- coding: utf-8 -*-
#
# AWL simulator - AWL optimizer - Remove BIE forwards
#
# Copyright 2017 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.cpuconfig import *
from awlsim.common.util import *
from awlsim.awloptimizer.base import *
from awlsim.core.operatortypes import * #+cimport
from awlsim.core.statusword import * #+cimport
from awlsim.core.instructions.all_insns import * #+cimport
__all__ = [
"AwlOptimizer_BIEForward",
]
class AwlOptimizer_BIEForward(AwlOptimizer_Base):
"""AWL/STL optimizer: Remove BIE forwards
This optimizes the instruction sequence:
SET
SPBxB xxx
xxx: U BIE
This optimizer depends on a preceding NOP removal run.
"""
NAME = "biefwd"
LONGNAME = "Remove BIE forwards"
DESC = "Optimize BIE forwarding sequences typically \n"\
"generated by some EN/ENO chains."
AFTER = frozenset(("noprem", ))
def __init__(self, optimizer):
AwlOptimizer_Base.__init__(self, optimizer)
def run(self, insns):
BIE_bitPos = S7StatusWord.getBitnrByName("BIE", S7CPUConfig.MNEMONICS_DE)
BIE_offset = make_AwlOffset(0, BIE_bitPos)
newInsns = []
skip = 0
for i, insn in enumerate(insns):
if skip:
skip -= 1
continue
if i <= len(insns) - 3 and\
isinstance(insns[i], AwlInsn_SET) and\
(isinstance(insns[i + 1], AwlInsn_SPBB) or\
isinstance(insns[i + 1], AwlInsn_SPBNB)) and\
isinstance(insns[i + 2], AwlInsn_U):
SET_insn = insns[i]
SPBxB_insn = insns[i + 1]
U_insn = insns[i + 2]
if len(U_insn.ops) == 1 and\
U_insn.ops[0].operType == AwlOperatorTypes.MEM_STW and\
U_insn.ops[0].offset == BIE_offset and\
len(SPBxB_insn.ops) == 1 and\
SPBxB_insn.ops[0].operType == AwlOperatorTypes.LBL_REF:
jmpTarget = SPBxB_insn.ops[0].immediateStr
foundInsns = self._findInsnsByLabel(insns, jmpTarget)
if len(foundInsns.jmpSourceInsns) == 1 and\
getany(foundInsns.jmpSourceInsns) is SPBxB_insn and\
len(foundInsns.jmpTargetInsns) == 1 and\
getany(foundInsns.jmpTargetInsns) is U_insn:
newInsns.append(insns[i]) # AwlInsn_SET
skip = 2
continue
newInsns.append(insn)
return newInsns
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