beremiz

use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

2019-01-06, Andrey Skvortsov
68f4f2d4516b
use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

This code could be possible reused on low-end targets with limited RAM.

code to generate lookup table:
[---------------------------------------------------------------------]

/* CRC lookup table and initial state. */
uint32_t crc32_table[256];

/* Generate CRC32 lookup table. */
void GenerateCRC32Table(void)
{
unsigned int i, j;
/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */
uint32_t poly = 0xEDB88320;

for (i = 0; i <= 0xFF; i++)
{
uint32_t c = i;
for (j = 0 ; j < 8 ; j++)
c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
crc32_table[i] = c;
}
}

void main(void)
{
GenerateCRC32Table();
int j=0;
for(int i=0; i<256; i++) {
printf("0x%08X, ", crc32_table[i]);
if (++j >= 8) {
j = 0;
printf("\n");
}
}
}
[---------------------------------------------------------------------]
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# 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 absolute_import
import os
import re
import operator
import hashlib
from functools import reduce
from util.ProcessLogger import ProcessLogger
includes_re = re.compile(r'\s*#include\s*["<]([^">]*)[">].*')
class toolchain_makefile(object):
def __init__(self, CTRInstance):
self.CTRInstance = CTRInstance
self.md5key = None
self.buildpath = None
self.SetBuildPath(self.CTRInstance._getBuildPath())
def SetBuildPath(self, buildpath):
if self.buildpath != buildpath:
self.buildpath = buildpath
self.md5key = None
def GetBinaryCode(self):
return None
def _GetMD5FileName(self):
return os.path.join(self.buildpath, "lastbuildPLC.md5")
def ResetBinaryCodeMD5(self):
self.md5key = None
try:
os.remove(self._GetMD5FileName())
except Exception:
pass
def GetBinaryCodeMD5(self):
if self.md5key is not None:
return self.md5key
else:
try:
return open(self._GetMD5FileName(), "r").read()
except IOError:
return None
def concat_deps(self, bn):
# read source
src = open(os.path.join(self.buildpath, bn), "r").read()
# update direct dependencies
deps = []
for l in src.splitlines():
res = includes_re.match(l)
if res is not None:
depfn = res.groups()[0]
if os.path.exists(os.path.join(self.buildpath, depfn)):
# print bn + " depends on "+depfn
deps.append(depfn)
# recurse through deps
# TODO detect cicular deps.
return reduce(operator.concat, map(self.concat_deps, deps), src)
def build(self):
srcfiles = []
cflags = []
wholesrcdata = ""
for _Location, CFilesAndCFLAGS, _DoCalls in self.CTRInstance.LocationCFilesAndCFLAGS:
# Get CFiles list to give it to makefile
for CFile, CFLAGS in CFilesAndCFLAGS:
CFileName = os.path.basename(CFile)
wholesrcdata += self.concat_deps(CFileName)
srcfiles.append(CFileName)
if CFLAGS not in cflags:
cflags.append(CFLAGS)
oldmd5 = self.md5key
self.md5key = hashlib.md5(wholesrcdata).hexdigest()
# Store new PLC filename based on md5 key
f = open(self._GetMD5FileName(), "w")
f.write(self.md5key)
f.close()
if oldmd5 != self.md5key:
target = self.CTRInstance.GetTarget().getcontent()
beremizcommand = {"src": ' '.join(srcfiles),
"cflags": ' '.join(cflags),
"md5": self.md5key,
"buildpath": self.buildpath}
# clean sequence of multiple whitespaces
cmd = re.sub(r"[ ]+", " ", target.getCommand().strip())
command = [token % beremizcommand for token in cmd.split(' ')]
# Call Makefile to build PLC code and link it with target specific code
status, _result, _err_result = ProcessLogger(self.CTRInstance.logger,
command).spin()
if status:
self.md5key = None
self.CTRInstance.logger.write_error(_("C compilation failed.\n"))
return False
return True
else:
self.CTRInstance.logger.write(_("Source didn't change, no build.\n"))
return True