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#!/usr/bin/env python3
import os
import re
import struct
import math
from collections import Counter
import argparse
def removepower(f, n):
if(n <= 1):
return f
t = f
while t % n == 0:
t /= n
return t
def rationalcheck(f, dmax, tol=23):
for den in range(1, dmax+1):
num = f * den
if round(num,0) > 0:
error = abs(math.log(num/round(num,0)))
else:
error = 1
if(error == 0 or -math.log2(error) > tol): #and (den % 10 == 0 or den % 0x10 == 0)):
if(removepower(den, 10) < 20 or removepower(den, 16) < 20):
print(f, int(round(num,0)), den, hex(den), math.floor(-math.log2(error)) if error != 0 else 0)
break
return 0
def findallfloats(path, odd=True, off=True):
numfilesodd = 0
numfilesoff = 0
for subdir, dirs, files in os.walk(path):
for filename in files:
filepath = subdir + os.sep + filename
if(filename.endswith('.c')): # and 'data' not in filename):
numodd, allodd, numoff, alloff = findoddfloats(filepath)
if(odd and numodd > 0):
print(filepath,'has', ('an ' if numodd == 1 else '') + 'odd float' + ('' if numodd == 1 else 's') + ':')
# print(set(allodd))
# breakpoint()
[rationalcheck(float(x.strip('f')), 1000) for x in set(allodd)]
numfilesodd += 1
if(off and numoff > 0):
print(filepath,'has', ('an ' if numoff == 1 else '') + 'off float' + ('' if numoff == 1 else 's') + ':')
print(set(alloff))
[rationalcheck(float(x[0].strip('f')), 1000, 22) for x in set(alloff)]
numfilesoff += 1
return numfilesodd, numfilesoff
def roundallfloats(path):
for subdir, dirs, files in os.walk(path):
for filename in files:
filepath = subdir + os.sep + filename
if filename.endswith('.c'):
numodd, numob1 = roundfloats(filepath)
if(numodd > 0):
print(filepath,'has', ('a ' if numodd == 1 else '') + 'fixable float' + ('' if numodd == 1 else 's'))
# print(allodd)
if(numob1 > 0):
print(filepath,'has', ('a ' if numob1 == 1 else '') + 'off-by-1 float' + ('' if numob1 == 1 else 's'))
return 0
def roundfloats(src):
floatmatch = re.compile('[0-9][0-9]*\.[0-9][0-9]*f')
numfix = 0
numob1 = 0
with open(src,'r',encoding='utf-8',newline='\n') as srcfile:
srcdata = srcfile.readlines()
for i, line in enumerate(srcdata):
floats = floatmatch.findall(line)
fixline = line
for f in floats:
fn = float(f.strip('f'))
rfn, ob1 = roundfloat(fn)
rf = str(rfn) + 'f'
if(fn != rfn):
numfix += 1
if('data' not in src):
print(src, 'line', i, ':', f, 'to', rf)
fixline = fixline.replace(f, rf)
# if(ob1):
# numob1 += 1
# print(src, 'line', i, ':', f, 'off-by-1')
srcdata[i] = fixline
if(numfix > 0):
with open(src, 'w', encoding='utf-8',newline='\n') as outfile:
outfile.writelines(srcdata)
return numfix, numob1
def findoddfloats(src):
floatmatch = re.compile('[0-9]*\.[0-9]*f')
numodd = 0
numoff = 0
allodd = []
alloff = []
with open(src,'r',encoding='utf-8') as srcfile:
for i, line in enumerate(srcfile):
floats = floatmatch.findall(line)
print("all")
print(floats)
oddfloats = [x for x in floats if (isoddfloat(x) and offby(x) >= 10)]
print("odd")
print(oddfloats)
offfloats = [(x, offby(x)) for x in floats if (isoddfloat(x) and offby(x) < 10)]
print("offfloats")
print(offfloats)
numodd += len(oddfloats)
numoff += len(offfloats)
alloff += offfloats
allodd += oddfloats
return numodd, allodd, numoff, alloff
def isoddfloat(floatstr):
return len(floatstr.strip('f').replace('.','').strip('0')) >= 7
def offby(floatstr):
val = float(floatstr.strip('f'))
fbytes = struct.pack(">f", val)
i = -math.floor(math.log10(val))
offvals = []
while(struct.pack(">f",round(val,i)) != fbytes):
fi = struct.unpack(">i",fbytes)[0]
rfi = struct.unpack(">i",struct.pack(">f",round(val,i-1)))[0]
offvals += [abs(fi - rfi)]
i += 1
if(offvals[-1] <= 2 and offvals[-2] <= 2):
return offvals[-1]
counter = Counter(offvals)
if(not counter.values()):
return 1000000
if(max(counter.values()) >= 3):
mode = min([item for item, count in counter.items() if count == max(counter.values())])
return mode
else:
return 1000000
def roundfloat(val):
fbytes = struct.pack(">f", val)
i = 0
offby1 = False
while(struct.pack(">f",round(val,i)) != fbytes):
fi = struct.unpack(">i",fbytes)[0]
rfi = struct.unpack(">i",struct.pack(">f",round(val,i)))[0]
if(fi - rfi == 1 or fi - rfi == -1):
offby1 = True
i += 1
return round(val, i), offby1
parser = argparse.ArgumentParser(description='Analyze floats in a project\'s source')
parser.add_argument('src', help="source file or directory to analyze")
parser.add_argument('-r', action='store_true',help='round all floats to minimum precision')
parser.add_argument('-d', action="store_true",help='Apply to a directory')
# parser.add_argument('-v', action='store_true',help='show what changes are made')
if __name__ == '__main__':
args = parser.parse_args()
if(args.r):
if(args.d):
roundallfloats(args.src)
else:
roundfloats(args.src)
if(args.d):
findallfloats(args.src)
else:
findoddfloats(args.src)
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