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#!/usr/bin/env python3
#
# Copyright (C) 2019 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import re
import subprocess
import logging
log = logging.getLogger(__name__)
class AbiTool(object):
""" Base class for different kinds of abi analysis tools"""
def dump_kernel_abi(self, linux_tree, dump_path, whitelist):
raise NotImplementedError()
def diff_abi(self, old_dump, new_dump, diff_report, short_report, whitelist):
raise NotImplementedError()
def name(self):
raise NotImplementedError()
ABIDIFF_ERROR = (1<<0)
ABIDIFF_USAGE_ERROR = (1<<1)
ABIDIFF_ABI_CHANGE = (1<<2)
ABIDIFF_ABI_INCOMPATIBLE_CHANGE = (1<<3)
class Libabigail(AbiTool):
"""" Concrete AbiTool implementation for libabigail """
def dump_kernel_abi(self, linux_tree, dump_path, whitelist):
dump_abi_cmd = ['abidw',
# omit various sources of indeterministic abidw output
'--no-corpus-path',
'--no-comp-dir-path',
# the path containing vmlinux and *.ko
'--linux-tree',
linux_tree,
'--out-file',
dump_path]
if whitelist is not None:
dump_abi_cmd.extend(['--kmi-whitelist', whitelist])
subprocess.check_call(dump_abi_cmd)
def diff_abi(self, old_dump, new_dump, diff_report, short_report, whitelist):
log.info('libabigail diffing: {} and {} at {}'.format(old_dump,
new_dump,
diff_report))
diff_abi_cmd = ['abidiff',
'--leaf-changes-only',
'--flag-indirect',
'--impacted-interfaces',
'--dump-diff-tree',
old_dump,
new_dump]
if whitelist is not None:
diff_abi_cmd.extend(['--kmi-whitelist', whitelist])
abi_changed = False
with open(diff_report, 'w') as out:
try:
subprocess.check_call(diff_abi_cmd, stdout=out, stderr=out)
except subprocess.CalledProcessError as e:
if e.returncode & (ABIDIFF_ERROR | ABIDIFF_USAGE_ERROR):
raise
abi_changed = True # actual abi change
if short_report is not None:
with open(diff_report) as full_report:
with open(short_report, 'w') as out:
out.write(re.sub(
r"^( *)([^ ]* impacted interfaces?):\n(?:^\1 .*\n)*",
r"\1\2\n",
full_report.read(),
flags=re.MULTILINE))
return abi_changed
def get_abi_tool(abi_tool):
if abi_tool == 'libabigail':
log.info('using libabigail for abi analysis')
return Libabigail()
raise ValueError("not a valid abi_tool: %s" % abi_tool)
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