mirror of
https://github.com/mozilla/gecko-dev.git
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397 lines
14 KiB
Python
397 lines
14 KiB
Python
# vim: set ts=8 sts=4 et sw=4 tw=99:
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#----------------------------------------------------------------------------
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# This script checks various aspects of SpiderMonkey code style. The current checks are as
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# follows.
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#
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# We check the following things in headers.
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#
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# - No cyclic dependencies.
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#
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# - No normal header should #include a inlines.h/-inl.h file.
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#
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# - #ifndef wrappers should have the right form. (XXX: not yet implemented)
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# - Every header file should have one.
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# - It should be in the vanilla form and have no tokens before/after it so
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# that GCC and clang can avoid multiple-inclusion.
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# - The guard name used should be appropriate for the filename.
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#
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# We check the following things in all files.
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#
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# - #includes should have full paths, e.g. "ion/Ion.h", not "Ion.h".
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#
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# - #includes should use the appropriate form for system headers (<...>) and
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# local headers ("...").
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#
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# - #includes should be ordered correctly. (XXX: not yet implemented; see bug
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# 888088)
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# - Each one should be in the correct section.
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# - Alphabetical order should be used within sections.
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# - Sections should be in the right order.
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#----------------------------------------------------------------------------
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from __future__ import print_function
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import difflib
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import os
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import re
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import subprocess
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import sys
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import traceback
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# We don't bother checking files in these directories, because they're (a) auxiliary or (b)
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# imported code that doesn't follow our coding style.
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ignored_js_src_dirs = [
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'js/src/config/', # auxiliary stuff
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'js/src/ctypes/libffi/', # imported code
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'js/src/devtools/', # auxiliary stuff
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'js/src/editline/', # imported code
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'js/src/gdb/', # auxiliary stuff
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'js/src/vtune/' # imported code
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]
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# We ignore #includes of these files, because they don't follow the usual rules.
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included_inclnames_to_ignore = set([
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'ffi.h', # generated in ctypes/libffi/
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'devtools/sharkctl.h', # we ignore devtools/ in general
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'devtools/Instruments.h', # we ignore devtools/ in general
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'double-conversion.h', # strange MFBT case
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'javascript-trace.h', # generated in $OBJDIR if HAVE_DTRACE is defined
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'jsautokw.h', # generated in $OBJDIR
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'jsautooplen.h', # generated in $OBJDIR
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'jscustomallocator.h', # provided by embedders; allowed to be missing
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'js-config.h', # generated in $OBJDIR
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'pratom.h', # NSPR
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'prcvar.h', # NSPR
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'prinit.h', # NSPR
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'prlink.h', # NSPR
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'prlock.h', # NSPR
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'prprf.h', # NSPR
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'prthread.h', # NSPR
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'prtypes.h', # NSPR
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'selfhosted.out.h', # generated in $OBJDIR
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'unicode/locid.h', # ICU
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'unicode/numsys.h', # ICU
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'unicode/ucal.h', # ICU
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'unicode/uclean.h', # ICU
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'unicode/ucol.h', # ICU
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'unicode/udat.h', # ICU
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'unicode/udatpg.h', # ICU
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'unicode/uenum.h', # ICU
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'unicode/unum.h', # ICU
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'unicode/ustring.h', # ICU
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'unicode/utypes.h', # ICU
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'vtune/VTuneWrapper.h' # VTune
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])
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# The files in tests/style/ contain code that fails this checking in various
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# ways. Here is the output we expect. If the actual output differs from
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# this, one of the following must have happened.
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# - New SpiderMonkey code violates one of the checked rules.
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# - The tests/style/ files have changed without expected_output being changed
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# accordingly.
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# - This script has been broken somehow.
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#
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expected_output = '''\
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js/src/tests/style/BadIncludes2.h:1: error:
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vanilla header includes an inline-header file "tests/style/BadIncludes2-inl.h"
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js/src/tests/style/BadIncludes.h:1: error:
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the file includes itself
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js/src/tests/style/BadIncludes.h:3: error:
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"BadIncludes2.h" is included using the wrong path;
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did you forget a prefix, or is the file not yet committed?
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js/src/tests/style/BadIncludes.h:4: error:
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<tests/style/BadIncludes2.h> should be included using
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the #include "..." form
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js/src/tests/style/BadIncludes.h:5: error:
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"stdio.h" is included using the wrong path;
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did you forget a prefix, or is the file not yet committed?
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(multiple files): error:
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header files form one or more cycles
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tests/style/HeaderCycleA1.h
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-> tests/style/HeaderCycleA2.h
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-> tests/style/HeaderCycleA3.h
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-> tests/style/HeaderCycleA1.h
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tests/style/HeaderCycleB1-inl.h
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-> tests/style/HeaderCycleB2-inl.h
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-> tests/style/HeaderCycleB3-inl.h
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-> tests/style/HeaderCycleB4-inl.h
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-> tests/style/HeaderCycleB1-inl.h
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-> tests/style/jsheadercycleB5inlines.h
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-> tests/style/HeaderCycleB1-inl.h
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-> tests/style/HeaderCycleB4-inl.h
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'''.splitlines(True)
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actual_output = []
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def out(*lines):
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for line in lines:
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actual_output.append(line + '\n')
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def error(filename, linenum, *lines):
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location = filename
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if linenum != None:
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location += ":" + str(linenum)
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out(location + ': error:')
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for line in (lines):
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out(' ' + line)
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out('')
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class FileKind(object):
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C = 1
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CPP = 2
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INL_H = 3
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H = 4
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TBL = 5
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MSG = 6
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@staticmethod
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def get(filename):
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if filename.endswith('.c'):
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return FileKind.C
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if filename.endswith('.cpp'):
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return FileKind.CPP
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if filename.endswith(('inlines.h', '-inl.h')):
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return FileKind.INL_H
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if filename.endswith('.h'):
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return FileKind.H
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if filename.endswith('.tbl'):
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return FileKind.TBL
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if filename.endswith('.msg'):
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return FileKind.MSG
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error(filename, None, 'unknown file kind')
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def get_all_filenames():
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"""Get a list of all the files in the (Mercurial or Git) repository."""
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cmds = [['hg', 'manifest'], ['git', 'ls-files']]
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for cmd in cmds:
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try:
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all_filenames = subprocess.check_output(cmd, universal_newlines=True,
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stderr=subprocess.PIPE).split('\n')
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return all_filenames
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except:
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continue
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else:
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raise Exception('failed to run any of the repo manifest commands', cmds)
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def check_style():
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# We deal with two kinds of name.
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# - A "filename" is a full path to a file from the repository root.
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# - An "inclname" is how a file is referred to in a #include statement.
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#
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# Examples (filename -> inclname)
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# - "mfbt/Attributes.h" -> "mozilla/Attributes.h"
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# - "js/public/Vector.h" -> "js/Vector.h"
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# - "js/src/vm/String.h" -> "vm/String.h"
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mfbt_inclnames = set() # type: set(inclname)
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js_names = dict() # type: dict(filename, inclname)
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# Select the appropriate files.
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for filename in get_all_filenames():
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if filename.startswith('mfbt/') and filename.endswith('.h'):
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inclname = 'mozilla/' + filename[len('mfbt/'):]
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mfbt_inclnames.add(inclname)
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if filename.startswith('js/public/') and filename.endswith('.h'):
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inclname = 'js/' + filename[len('js/public/'):]
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js_names[filename] = inclname
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if filename.startswith('js/src/') and \
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not filename.startswith(tuple(ignored_js_src_dirs)) and \
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filename.endswith(('.c', '.cpp', '.h', '.tbl', '.msg')):
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inclname = filename[len('js/src/'):]
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js_names[filename] = inclname
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all_inclnames = mfbt_inclnames | set(js_names.values())
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edges = dict() # type: dict(inclname, set(inclname))
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# We don't care what's inside the MFBT files, but because they are
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# #included from JS files we have to add them to the inclusion graph.
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for inclname in mfbt_inclnames:
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edges[inclname] = set()
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# Process all the JS files.
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for filename in js_names.keys():
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inclname = js_names[filename]
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file_kind = FileKind.get(filename)
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if file_kind == FileKind.C or file_kind == FileKind.CPP or \
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file_kind == FileKind.H or file_kind == FileKind.INL_H:
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included_h_inclnames = set() # type: set(inclname)
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# This script is run in js/src/, so prepend '../../' to get to the root of the Mozilla
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# source tree.
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with open(os.path.join('../..', filename)) as f:
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do_file(filename, inclname, file_kind, f, all_inclnames, included_h_inclnames)
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edges[inclname] = included_h_inclnames
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find_cycles(all_inclnames, edges)
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# Compare expected and actual output.
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difflines = difflib.unified_diff(expected_output, actual_output,
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fromfile='check_spider_monkey_style.py expected output',
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tofile='check_spider_monkey_style.py actual output')
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ok = True
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for diffline in difflines:
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ok = False
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print(diffline, end='')
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return ok
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def do_file(filename, inclname, file_kind, f, all_inclnames, included_h_inclnames):
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for linenum, line in enumerate(f, start=1):
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# Look for a |#include "..."| line.
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m = re.match(r'\s*#\s*include\s+"([^"]*)"', line)
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if m is not None:
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included_inclname = m.group(1)
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if included_inclname not in included_inclnames_to_ignore:
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included_kind = FileKind.get(included_inclname)
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# Check the #include path has the correct form.
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if included_inclname not in all_inclnames:
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error(filename, linenum,
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'"' + included_inclname + '" is included ' + 'using the wrong path;',
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'did you forget a prefix, or is the file not yet committed?')
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# Record inclusions of .h files for cycle detection later.
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# (Exclude .tbl and .msg files.)
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elif included_kind == FileKind.H or included_kind == FileKind.INL_H:
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included_h_inclnames.add(included_inclname)
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# Check a H file doesn't #include an INL_H file.
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if file_kind == FileKind.H and included_kind == FileKind.INL_H:
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error(filename, linenum,
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'vanilla header includes an inline-header file "' + included_inclname + '"')
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# Check a file doesn't #include itself. (We do this here because the
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# cycle detection below doesn't detect this case.)
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if inclname == included_inclname:
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error(filename, linenum, 'the file includes itself')
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# Look for a |#include <...>| line.
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m = re.match(r'\s*#\s*include\s+<([^>]*)>', line)
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if m is not None:
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included_inclname = m.group(1)
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# Check it is not a known local file (in which case it's
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# probably a system header).
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if included_inclname in included_inclnames_to_ignore or \
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included_inclname in all_inclnames:
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error(filename, linenum,
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'<' + included_inclname + '> should be included using',
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'the #include "..." form')
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def find_cycles(all_inclnames, edges):
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"""Find and draw any cycles."""
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SCCs = tarjan(all_inclnames, edges)
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# The various sorted() calls below ensure the output is deterministic.
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def draw_SCC(c):
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cset = set(c)
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drawn = set()
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def draw(v, indent):
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out(' ' * indent + ('-> ' if indent else ' ') + v)
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if v in drawn:
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return
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drawn.add(v)
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for succ in sorted(edges[v]):
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if succ in cset:
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draw(succ, indent + 1)
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draw(sorted(c)[0], 0)
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out('')
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have_drawn_an_SCC = False
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for scc in sorted(SCCs):
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if len(scc) != 1:
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if not have_drawn_an_SCC:
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error('(multiple files)', None, 'header files form one or more cycles')
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have_drawn_an_SCC = True
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draw_SCC(scc)
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# Tarjan's algorithm for finding the strongly connected components (SCCs) of a graph.
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# https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
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def tarjan(V, E):
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vertex_index = {}
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vertex_lowlink = {}
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index = 0
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S = []
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all_SCCs = []
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def strongconnect(v, index):
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# Set the depth index for v to the smallest unused index
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vertex_index[v] = index
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vertex_lowlink[v] = index
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index += 1
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S.append(v)
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# Consider successors of v
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for w in E[v]:
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if w not in vertex_index:
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# Successor w has not yet been visited; recurse on it
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index = strongconnect(w, index)
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vertex_lowlink[v] = min(vertex_lowlink[v], vertex_lowlink[w])
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elif w in S:
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# Successor w is in stack S and hence in the current SCC
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vertex_lowlink[v] = min(vertex_lowlink[v], vertex_index[w])
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# If v is a root node, pop the stack and generate an SCC
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if vertex_lowlink[v] == vertex_index[v]:
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i = S.index(v)
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scc = S[i:]
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del S[i:]
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all_SCCs.append(scc)
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return index
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for v in V:
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if v not in vertex_index:
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index = strongconnect(v, index)
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return all_SCCs
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def main():
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ok = check_style()
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if ok:
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print('TEST-PASS | check_spidermonkey_style.py | ok')
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else:
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print('TEST-UNEXPECTED-FAIL | check_spidermonkey_style.py | actual output does not match expected output; diff is above')
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sys.exit(0 if ok else 1)
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if __name__ == "__main__":
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main()
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