gem5/util/style/verifiers.py

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#!/usr/bin/env python
#
# Copyright (c) 2014, 2016 ARM Limited
# All rights reserved
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2006 The Regents of The University of Michigan
# Copyright (c) 2007,2011 The Hewlett-Packard Development Company
# Copyright (c) 2016 Advanced Micro Devices, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Nathan Binkert
# Steve Reinhardt
# Andreas Sandberg
from abc import ABCMeta, abstractmethod
from difflib import SequenceMatcher
import inspect
import os
import re
import sys
import style
import sort_includes
from region import *
from file_types import lang_type
def safefix(fix_func):
""" Decorator for the fix functions of the Verifier class.
This function wraps the fix function and creates a backup file
just in case there is an error.
"""
def safefix_wrapper(*args, **kwargs):
# Check to be sure that this is decorating a function we expect:
# a class method with filename as the first argument (after self)
assert(os.path.exists(args[1]))
self = args[0]
assert(is_verifier(self.__class__))
filename = args[1]
# Now, Let's make a backup file.
from shutil import copyfile
backup_name = filename+'.bak'
copyfile(filename, backup_name)
# Try to apply the fix. If it fails, then we revert the file
# Either way, we need to clean up our backup file
try:
fix_func(*args, **kwargs)
except Exception as e:
# Restore the original file to the backup file
self.ui.write("Error! Restoring the original file.\n")
copyfile(backup_name, filename)
raise
finally:
# Clean up the backup file
os.remove(backup_name)
return safefix_wrapper
def _modified_regions(old, new):
try:
m = SequenceMatcher(a=old, b=new, autojunk=False)
except TypeError:
# autojunk was introduced in Python 2.7. We need a fallback
# mechanism to support old Python versions.
m = SequenceMatcher(a=old, b=new)
regions = Regions()
for tag, i1, i2, j1, j2 in m.get_opcodes():
if tag != "equal":
regions.extend(Region(i1, i2))
return regions
class Verifier(object):
"""Base class for style verifiers
Verifiers check for style violations and optionally fix such
violations. Implementations should either inherit from this class
(Verifier) if they need to work on entire files or LineVerifier if
they operate on a line-by-line basis.
Subclasses must define these class attributes:
languages = set of strings identifying applicable languages
test_name = long descriptive name of test, will be used in
messages such as "error in <foo>" or "invalid <foo>"
opt_name = short name used to generate command-line options to
control the test (--fix-<foo>, --ignore-<foo>, etc.)
"""
__metaclass__ = ABCMeta
def __init__(self, ui, opts, base=None):
self.ui = ui
self.base = base
# opt_name must be defined as a class attribute of derived classes.
# Check test-specific opts first as these have precedence.
self.opt_fix = opts.get('fix_' + self.opt_name, False)
self.opt_ignore = opts.get('ignore_' + self.opt_name, False)
self.opt_skip = opts.get('skip_' + self.opt_name, False)
# If no test-specific opts were set, then set based on "-all" opts.
if not (self.opt_fix or self.opt_ignore or self.opt_skip):
self.opt_fix = opts.get('fix_all', False)
self.opt_ignore = opts.get('ignore_all', False)
self.opt_skip = opts.get('skip_all', False)
def normalize_filename(self, name):
abs_name = os.path.abspath(name)
if self.base is None:
return abs_name
abs_base = os.path.abspath(self.base)
return os.path.relpath(abs_name, start=abs_base)
def open(self, filename, mode):
try:
f = file(filename, mode)
except OSError, msg:
print 'could not open file %s: %s' % (filename, msg)
return None
return f
def skip(self, filename):
# We never want to handle symlinks, so always skip them: If the
# location pointed to is a directory, skip it. If the location is a
# file inside the gem5 directory, it will be checked as a file, so
# symlink can be skipped. If the location is a file outside gem5, we
# don't want to check it anyway.
if os.path.islink(filename):
return True
return lang_type(filename) not in self.languages
def apply(self, filename, regions=all_regions):
"""Possibly apply to specified regions of file 'filename'.
Verifier is skipped if --skip-<test> option was provided or if
file is not of an applicable type. Otherwise file is checked
and error messages printed. Errors are fixed or ignored if
the corresponding --fix-<test> or --ignore-<test> options were
provided. If neither, the user is prompted for an action.
Returns True to abort, False otherwise.
"""
if not (self.opt_skip or self.skip(filename)):
errors = self.check(filename, regions)
if errors and not self.opt_ignore:
if self.opt_fix:
self.fix(filename, regions)
else:
result = self.ui.prompt("(a)bort, (i)gnore, or (f)ix?",
'aif', 'a')
if result == 'f':
self.fix(filename, regions)
elif result == 'a':
return True # abort
return False
@abstractmethod
def check(self, filename, regions=all_regions, fobj=None, silent=False):
"""Check specified regions of file 'filename'.
Given that it is possible that the current contents of the file
differ from the file as 'staged to commit', for those cases, and
maybe others, the argument fobj should be a file object open and reset
with the contents matching what the file would look like after the
commit. This is needed keep the messages using 'filename' meaningful.
The argument silent is useful to prevent output when we run check in
the staged file vs the actual file to detect if the user forgot
staging fixes to the commit. This way, we prevent reporting errors
twice in stderr.
Line-by-line checks can simply provide a check_line() method
that returns True if the line is OK and False if it has an
error. Verifiers that need a multi-line view (like
SortedIncludes) must override this entire function.
Returns a count of errors (0 if none), though actual non-zero
count value is not currently used anywhere.
"""
pass
@abstractmethod
def fix(self, filename, regions=all_regions):
"""Fix specified regions of file 'filename'.
Line-by-line fixes can simply provide a fix_line() method that
returns the fixed line. Verifiers that need a multi-line view
(like SortedIncludes) must override this entire function.
"""
pass
class LineVerifier(Verifier):
def check(self, filename, regions=all_regions, fobj=None, silent=False):
close = False
if fobj is None:
fobj = self.open(filename, 'r')
close = True
lang = lang_type(filename)
assert lang in self.languages
errors = 0
for num,line in enumerate(fobj):
if num not in regions:
continue
line = line.rstrip('\n')
if not self.check_line(line, language=lang):
if not silent:
self.ui.write("invalid %s in %s:%d\n" % \
(self.test_name, filename, num + 1))
if self.ui.verbose:
self.ui.write(">>%s<<\n" % line[:-1])
errors += 1
if close:
fobj.close()
return errors
@safefix
def fix(self, filename, regions=all_regions):
f = self.open(filename, 'r+')
lang = lang_type(filename)
assert lang in self.languages
lines = list(f)
f.seek(0)
f.truncate()
for i,line in enumerate(lines):
line = line.rstrip('\n')
if i in regions:
line = self.fix_line(line, language=lang)
f.write(line)
f.write("\n")
f.close()
self.current_language = None
@abstractmethod
def check_line(self, line, **kwargs):
pass
@abstractmethod
def fix_line(self, line, **kwargs):
pass
class Whitespace(LineVerifier):
"""Check whitespace.
Specifically:
- No tabs used for indent
- No trailing whitespace
"""
languages = set(('C', 'C++', 'swig', 'python', 'asm', 'isa', 'scons',
'make', 'dts'))
trail_only = set(('make', 'dts'))
test_name = 'whitespace'
opt_name = 'white'
_lead = re.compile(r'^([ \t]+)')
_trail = re.compile(r'([ \t]+)$')
def skip_lead(self, language):
return language in Whitespace.trail_only
def check_line(self, line, language):
if not self.skip_lead(language):
match = Whitespace._lead.search(line)
if match and match.group(1).find('\t') != -1:
return False
match = Whitespace._trail.search(line)
if match:
return False
return True
def fix_line(self, line, language):
if not self.skip_lead(language) and Whitespace._lead.search(line):
newline = ''
for i,c in enumerate(line):
if c == ' ':
newline += ' '
elif c == '\t':
newline += ' ' * (style.tabsize - \
len(newline) % style.tabsize)
else:
newline += line[i:]
break
line = newline
return line.rstrip()
class SortedIncludes(Verifier):
"""Check for proper sorting of include statements"""
languages = sort_includes.default_languages
test_name = 'include file order'
opt_name = 'include'
def __init__(self, *args, **kwargs):
super(SortedIncludes, self).__init__(*args, **kwargs)
self.sort_includes = sort_includes.SortIncludes()
def check(self, filename, regions=all_regions, fobj=None, silent=False):
close = False
if fobj is None:
fobj = self.open(filename, 'r')
close = True
norm_fname = self.normalize_filename(filename)
old = [ l.rstrip('\n') for l in fobj.xreadlines() ]
if close:
fobj.close()
if len(old) == 0:
return 0
language = lang_type(filename, old[0])
new = list(self.sort_includes(old, norm_fname, language))
modified = _modified_regions(old, new) & regions
if modified:
if not silent:
self.ui.write("invalid sorting of includes in %s\n"
% (filename))
if self.ui.verbose:
for start, end in modified.regions:
self.ui.write("bad region [%d, %d)\n" % (start, end))
return 1
return 0
@safefix
def fix(self, filename, regions=all_regions):
f = self.open(filename, 'r+')
old = f.readlines()
lines = [ l.rstrip('\n') for l in old ]
language = lang_type(filename, lines[0])
sort_lines = list(self.sort_includes(lines, filename, language))
new = ''.join(line + '\n' for line in sort_lines)
f.seek(0)
f.truncate()
for i,line in enumerate(sort_lines):
f.write(line)
f.write('\n')
f.close()
class ControlSpace(LineVerifier):
"""Check for exactly one space after if/while/for"""
languages = set(('C', 'C++'))
test_name = 'spacing after if/while/for'
opt_name = 'control'
_any_control = re.compile(r'\b(if|while|for)([ \t]*)\(')
def check_line(self, line, **kwargs):
match = ControlSpace._any_control.search(line)
return not (match and match.group(2) != " ")
def fix_line(self, line, **kwargs):
new_line = ControlSpace._any_control.sub(r'\1 (', line)
return new_line
class LineLength(LineVerifier):
languages = set(('C', 'C++', 'swig', 'python', 'asm', 'isa', 'scons'))
test_name = 'line length'
opt_name = 'length'
def check_line(self, line, **kwargs):
return style.normalized_len(line) <= 79
def fix(self, filename, regions=all_regions, **kwargs):
self.ui.write("Warning: cannot automatically fix overly long lines.\n")
def fix_line(self, line):
pass
class ControlCharacters(LineVerifier):
languages = set(('C', 'C++', 'swig', 'python', 'asm', 'isa', 'scons'))
test_name = 'control character'
opt_name = 'ascii'
valid = ('\n', '\t')
invalid = "".join([chr(i) for i in range(0, 0x20) if chr(i) not in valid])
def check_line(self, line, **kwargs):
return self.fix_line(line) == line
def fix_line(self, line, **kwargs):
return line.translate(None, ControlCharacters.invalid)
class BoolCompare(LineVerifier):
languages = set(('C', 'C++', 'python'))
test_name = 'boolean comparison'
opt_name = 'boolcomp'
regex = re.compile(r'\s*==\s*([Tt]rue|[Ff]alse)\b')
def check_line(self, line, **kwargs):
return self.regex.search(line) == None
def fix_line(self, line, **kwargs):
match = self.regex.search(line)
if match:
if match.group(1) in ('true', 'True'):
line = self.regex.sub('', line)
else:
self.ui.write("Warning: cannot automatically fix "
"comparisons with false/False.\n")
return line
def is_verifier(cls):
"""Determine if a class is a Verifier that can be instantiated"""
return inspect.isclass(cls) and issubclass(cls, Verifier) and \
not inspect.isabstract(cls)
# list of all verifier classes
all_verifiers = [ v for n, v in \
inspect.getmembers(sys.modules[__name__], is_verifier) ]