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# -*- coding: utf-8 -*-
#
# AWL simulator - AWL optimizer - Remove unused labels
#
# 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
from awlsim.core.operatortypes import * #+cimport
__all__ = [
"AwlOptimizer_LabelRemove",
]
class AwlOptimizer_LabelRemove(AwlOptimizer_Base):
"""AWL/STL optimizer: Remove unused labels
"""
NAME = "lblrem"
LONGNAME = "Remove unused labels"
DESC = "Remove labels that are not referenced by any instruction."
STAGES = frozenset((AwlOptimizer_Base.STAGE3, ))
BEFORE = frozenset()
AFTER = frozenset()
def __init__(self, optimizer):
AwlOptimizer_Base.__init__(self, optimizer)
def run(self, insns):
# Build a set of labels that actually are referenced.
usedLabels = set()
for insn in insns:
for oper in insn.ops:
if oper.operType == AwlOperatorTypes.LBL_REF:
usedLabels.add(oper.immediateStr)
# Remove unreferenced labels.
for insn in insns:
if insn.hasLabel() and\
insn.getLabel() not in usedLabels:
insn.setLabel(None)
return insns
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