#
# Copyright (c) 2019 Chris Johns <chrisj@rtems.org>.
# All rights reserved.
#
# The license and distribution terms for this file may be
# found in the file LICENSE in this distribution or at
# http://www.rtems.org/license/LICENSE.
#
# Check the allocations for libdl:
#
# 1. Turn on the allocation trace.
#
# 2. Load and unload object files.
#
# 3. Capture the trace output and feed to this tool
#
from __future__ import print_function
import argparse
class libdl_trace(object):
def __init__(self, name):
self.name = name
self.trace = {'alloc': []}
def load(self):
with open(self.name, 'r') as f:
lc = 0
for line in f:
line = line[:-1]
lc += 1
if line.startswith('rtl: '):
if line.startswith('rtl: alloc: '):
self.trace['alloc'] += [(lc, line)]
def check_allocs(self):
allocs = {}
locks = 0
wr_enable = False
for lc, line in self.trace['alloc']:
ls = line.split(' ')
if len(ls) > 3:
if ls[2] == 'new:':
addr = ls[4].split('=')[1]
size = ls[5].split('=')[1]
count = 0
if addr in allocs:
alc, alloced, asize, count = allocs[addr]
if alloced:
print(
'%5d: already alloced: %5d: addr=%-9s size=%-9s count=%d'
% (lc, alc, addr, asize, count))
allocs[addr] = (lc, True, size, count + 1)
elif ls[2] == 'del:':
addr = ls[4].split('=')[1]
if addr != '0':
if addr not in allocs:
print('%5d: delete never alloced: addr=%s' %
(lc, addr))
else:
alc, alloced, size, count = allocs[addr]
if not alloced:
print(
'%5d: delete not alloced: %5d: addr=%-9s size=%-9s count=%d'
% (lc, alc, addr, size, count))
allocs[addr] = (lc, False, size, count)
alloced_remaiing = 0
addresses = sorted(list(allocs.keys()))
for addr in addresses:
lc, alloced, size, count = allocs[addr]
if alloced:
print('%5d: never deleted: addr=%-9s size=%-9s count=%d' %
(lc, addr, size, count))
alloced_remaiing += int(size)
if alloced_remaiing != 0:
print("Amount alloced: %d" % (alloced_remaiing))
def run(args):
argsp = argparse.ArgumentParser(prog='rtl-alloc-check',
description='Audit libdl allocations')
argsp.add_argument('traces', help='libdl trace files', nargs='+')
opts = argsp.parse_args(args[1:])
for t in opts.traces:
trace = libdl_trace(t)
trace.load()
trace.check_allocs()
if __name__ == "__main__":
import sys
run(sys.argv)
