check-static-inits.py

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#!/usr/bin/env python3

import sys, os, shutil, subprocess, glob, re

builddir = os.getenv ('builddir', os.path.dirname (__file__))

libs = os.getenv ('libs', '.libs')

objdump = os.getenv ('OBJDUMP', shutil.which ('objdump'))

if not objdump:

	print ('check-static-inits.py: \'ldd\' not found; skipping test')

	sys.exit (77)

if sys.version_info < (3, 5):

	print ('check-static-inits.py: needs python 3.5 for recursive support in glob')

	sys.exit (77)

OBJS = glob.glob (os.path.join (builddir, libs, '**', '*hb*.o'), recursive=True)

if not OBJS:

	print ('check-static-inits.py: object files not found; skipping test')

	sys.exit (77)

stat = 0

tested = 0

for obj in OBJS:

	result = subprocess.run(objdump.split () + ['-t', obj], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

	if result.returncode:

		if result.stderr.find (b'not recognized') != -1:

			# https://github.com/harfbuzz/harfbuzz/issues/3019

			print ('objdump %s returned "not recognized", skipping' % obj)

			continue

		print ('objdump %s returned error:\n%s' % (obj, result.stderr.decode ('utf-8')))

		stat = 2

	result = result.stdout.decode ('utf-8')

	# Checking that no object file has static initializers

	for l in re.findall (r'^.*\.[cd]tors.*$', result, re.MULTILINE):

		if not re.match (r'.*\b0+\b', l):

			print ('Ouch, %s has static initializers/finalizers' % obj)

			stat = 1

	# Checking that no object file has lazy static C++ constructors/destructors or other such stuff

	if ('__cxa_' in result) and ('__ubsan_handle' not in result):

		print ('Ouch, %s has lazy static C++ constructors/destructors or other such stuff' % obj)

		stat = 1

	tested += 1

sys.exit (stat if tested else 77)