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# -*- coding: utf-8 -*-
#
# AWL simulator - AWL optimizer - Remove NOPs
#
# 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.awloptimizer.base import *
from awlsim.core.instructions.all_insns import * #+cimport
__all__ = [
"AwlOptimizer_NopRemove",
]
class AwlOptimizer_NopRemove(AwlOptimizer_Base):
"""AWL/STL optimizer: Remove NOP instructions
"""
NAME = "noprem"
LONGNAME = "Remove superfluous NOP instructions"
DESC = "Removes almost all NOP instructions from the program."
def __init__(self, optimizer):
AwlOptimizer_Base.__init__(self, optimizer)
def run(self, insns):
newInsns = []
for i, insn in enumerate(insns):
if isinstance(insn, AwlInsn_NOP):
if insn.labelStr:
if i < len(insns) - 1:
# Move the label to the next insn
nextInsn = insns[i + 1]
if nextInsn.labelStr:
# Rename all references to insn.labelStr
# to nextInsn.labelStr
pass#TODO
else:
# Assign the label to the next insn.
nextInsn.labelStr = insn.labelStr
# Remove the NOP
continue
else:
# This NOP is the last insn.
# Keep it.
pass
else:
# This is just a plain NOP.
# Remove it.
continue
newInsns.append(insn)
return newInsns
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