mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-28 15:23:51 +00:00
787 lines
29 KiB
Python
787 lines
29 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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# - 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. "jit/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.
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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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# Note that the presence of #if/#endif blocks complicates things, to the
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# point that it's not always clear where a conditionally-compiled #include
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# statement should go, even to a human. Therefore, we check the #include
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# statements within each #if/#endif block (including nested ones) in
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# isolation, but don't try to do any order checking between such blocks.
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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 sys
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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/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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'frontend/ReservedWordsGenerated.h', # generated in $OBJDIR
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'gc/StatsPhasesGenerated.h', # generated in $OBJDIR
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'gc/StatsPhasesGenerated.cpp', # generated in $OBJDIR
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'jit/LOpcodes.h', # generated in $OBJDIR
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'jit/MOpcodes.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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'fdlibm.h', # fdlibm
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'FuzzerDefs.h', # included without a path
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'FuzzingInterface.h', # included without a path
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'mozmemory.h', # included without a path
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'pratom.h', # NSPR
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'prcvar.h', # NSPR
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'prerror.h', # NSPR
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'prinit.h', # NSPR
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'prio.h', # NSPR
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'private/pprio.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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'shellmoduleloader.out.h', # generated in $OBJDIR
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'unicode/timezone.h', # ICU
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'unicode/plurrule.h', # ICU
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'unicode/ucal.h', # ICU
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'unicode/uchar.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/udisplaycontext.h',# ICU
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'unicode/uenum.h', # ICU
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'unicode/uloc.h', # ICU
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'unicode/unistr.h', # ICU
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'unicode/unorm2.h', # ICU
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'unicode/unum.h', # ICU
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'unicode/unumsys.h', # ICU
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'unicode/upluralrules.h', # ICU
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'unicode/ureldatefmt.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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# These files have additional constraints on where they are #included, so we
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# ignore #includes of them when checking #include ordering.
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oddly_ordered_inclnames = set([
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'ctypes/typedefs.h', # Included multiple times in the body of ctypes/CTypes.h
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'frontend/BinSource-auto.h', # Included in the body of frontend/BinSource.h
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'frontend/ReservedWordsGenerated.h', # Included in the body of frontend/TokenStream.h
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'gc/StatsPhasesGenerated.h', # Included in the body of gc/Statistics.h
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'gc/StatsPhasesGenerated.cpp', # Included in the body of gc/Statistics.cpp
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'psapi.h', # Must be included after "util/Windows.h" on Windows
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'machine/endian.h', # Must be included after <sys/types.h> on BSD
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'winbase.h', # Must precede other system headers(?)
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'windef.h' # Must precede other system headers(?)
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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:3: error:
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the file includes itself
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js/src/tests/style/BadIncludes.h:6: 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:8: 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:10: 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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js/src/tests/style/BadIncludesOrder-inl.h:5:6: error:
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"vm/JSScript-inl.h" should be included after "vm/Interpreter-inl.h"
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js/src/tests/style/BadIncludesOrder-inl.h:6:7: error:
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"vm/Interpreter-inl.h" should be included after "js/Value.h"
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js/src/tests/style/BadIncludesOrder-inl.h:7:8: error:
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"js/Value.h" should be included after "ds/LifoAlloc.h"
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js/src/tests/style/BadIncludesOrder-inl.h:8:9: error:
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"ds/LifoAlloc.h" should be included after "jsapi.h"
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js/src/tests/style/BadIncludesOrder-inl.h:9:10: error:
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"jsapi.h" should be included after <stdio.h>
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js/src/tests/style/BadIncludesOrder-inl.h:10:11: error:
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<stdio.h> should be included after "mozilla/HashFunctions.h"
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js/src/tests/style/BadIncludesOrder-inl.h:28:29: error:
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"vm/JSScript.h" should be included after "vm/JSFunction.h"
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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 is not 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 check_style(enable_fixup):
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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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# - "mfbt/decimal/Decimal.h -> "mozilla/Decimal.h"
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# - "mozglue/misc/TimeStamp.h -> "mozilla/TimeStamp.h"
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# - "memory/mozalloc/mozalloc.h -> "mozilla/mozalloc.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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non_js_dirnames = ('mfbt/',
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'memory/mozalloc/',
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'mozglue/') # type: tuple(str)
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non_js_inclnames = set() # type: set(inclname)
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js_names = dict() # type: dict(filename, inclname)
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# Process files in js/src.
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js_src_root = os.path.join('js', 'src')
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for dirpath, dirnames, filenames in os.walk(js_src_root):
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if dirpath == js_src_root:
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# Skip any subdirectories that contain a config.status file
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# (likely objdirs).
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builddirs = []
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for dirname in dirnames:
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path = os.path.join(dirpath, dirname, 'config.status')
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if os.path.isfile(path):
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builddirs.append(dirname)
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for dirname in builddirs:
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dirnames.remove(dirname)
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for filename in filenames:
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filepath = os.path.join(dirpath, filename).replace('\\', '/')
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if not filepath.startswith(tuple(ignored_js_src_dirs)) and \
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filepath.endswith(('.c', '.cpp', '.h', '.tbl', '.msg')):
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inclname = filepath[len('js/src/'):]
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js_names[filepath] = inclname
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# Look for header files in directories in non_js_dirnames.
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for non_js_dir in non_js_dirnames:
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for dirpath, dirnames, filenames in os.walk(non_js_dir):
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for filename in filenames:
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if filename.endswith('.h'):
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inclname = 'mozilla/' + filename
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non_js_inclnames.add(inclname)
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# Look for header files in js/public.
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js_public_root = os.path.join('js', 'public')
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for dirpath, dirnames, filenames in os.walk(js_public_root):
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for filename in filenames:
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if filename.endswith('.h'):
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filepath = os.path.join(dirpath, filename).replace('\\', '/')
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inclname = 'js/' + filepath[len('js/public/'):]
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js_names[filepath] = inclname
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all_inclnames = non_js_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 and MOZALLOC files, but because they
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# are #included from JS files we have to add them to the inclusion graph.
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for inclname in non_js_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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with open(filename) as f:
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code = read_file(f)
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if enable_fixup:
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code = code.sorted(inclname)
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with open(filename, 'w') as f:
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f.write(code.to_source())
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check_file(filename, inclname, file_kind, code, 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_spidermonkey_style.py expected output',
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tofile='check_spidermonkey_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 module_name(name):
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'''Strip the trailing .cpp, .h, inlines.h or -inl.h from a filename.'''
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return name.replace('inlines.h', '').replace('-inl.h', '').replace('.h', '').replace('.cpp', '')
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def is_module_header(enclosing_inclname, header_inclname):
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'''Determine if an included name is the "module header", i.e. should be
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first in the file.'''
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module = module_name(enclosing_inclname)
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# Normal case, e.g. module == "foo/Bar", header_inclname == "foo/Bar.h".
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if module == module_name(header_inclname):
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return True
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# A public header, e.g. module == "foo/Bar", header_inclname == "js/Bar.h".
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m = re.match(r'js\/(.*)\.h', header_inclname)
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if m is not None and module.endswith('/' + m.group(1)):
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return True
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return False
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class Include(object):
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'''Important information for a single #include statement.'''
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def __init__(self, include_prefix, inclname, line_suffix, linenum, is_system):
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self.include_prefix = include_prefix
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self.line_suffix = line_suffix
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self.inclname = inclname
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self.linenum = linenum
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self.is_system = is_system
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def is_style_relevant(self):
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# Includes are style-relevant; that is, they're checked by the pairwise
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# style-checking algorithm in check_file.
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return True
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def section(self, enclosing_inclname):
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'''Identify which section inclname belongs to.
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The section numbers are as follows.
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0. Module header (e.g. jsfoo.h or jsfooinlines.h within jsfoo.cpp)
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1. mozilla/Foo.h
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2. <foo.h> or <foo>
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3. jsfoo.h, prmjtime.h, etc
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4. foo/Bar.h
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5. jsfooinlines.h
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6. foo/Bar-inl.h
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7. non-.h, e.g. *.tbl, *.msg
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'''
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if self.is_system:
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return 2
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if not self.inclname.endswith('.h'):
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return 7
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# A couple of modules have the .h file in js/ and the .cpp file elsewhere and so need
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# special handling.
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if is_module_header(enclosing_inclname, self.inclname):
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return 0
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if '/' in self.inclname:
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if self.inclname.startswith('mozilla/'):
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return 1
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if self.inclname.endswith('-inl.h'):
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return 6
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return 4
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if self.inclname.endswith('inlines.h'):
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return 5
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return 3
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def quote(self):
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if self.is_system:
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return '<' + self.inclname + '>'
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else:
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return '"' + self.inclname + '"'
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def sort_key(self, enclosing_inclname):
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return (self.section(enclosing_inclname), self.inclname.lower())
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def to_source(self):
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return self.include_prefix + self.quote() + self.line_suffix + '\n'
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class CppBlock(object):
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'''C preprocessor block: a whole file or a single #if/#elif/#else block.
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A #if/#endif block is the contents of a #if/#endif (or similar) section.
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The top-level block, which is not within a #if/#endif pair, is also
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considered a block.
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Each kid is either an Include (representing a #include), OrdinaryCode, or
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a nested CppBlock.'''
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def __init__(self, start_line=""):
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self.start = start_line
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self.end = ''
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self.kids = []
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def is_style_relevant(self):
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return True
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def append_ordinary_line(self, line):
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if len(self.kids) == 0 or not isinstance(self.kids[-1], OrdinaryCode):
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self.kids.append(OrdinaryCode())
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self.kids[-1].lines.append(line)
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def style_relevant_kids(self):
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""" Return a list of kids in this block that are style-relevant. """
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return [kid for kid in self.kids if kid.is_style_relevant()]
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def sorted(self, enclosing_inclname):
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"""Return a hopefully-sorted copy of this block. Implements --fixup.
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When in doubt, this leaves the code unchanged.
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"""
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def pretty_sorted_includes(includes):
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""" Return a new list containing the given includes, in order,
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with blank lines separating sections. """
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keys = [inc.sort_key(enclosing_inclname) for inc in includes]
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if sorted(keys) == keys:
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return includes # if nothing is out of order, don't touch anything
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output = []
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current_section = None
|
|
for (section, _), inc in sorted(zip(keys, includes)):
|
|
if current_section is not None and section != current_section:
|
|
output.append(OrdinaryCode(["\n"])) # blank line
|
|
output.append(inc)
|
|
current_section = section
|
|
return output
|
|
|
|
def should_try_to_sort(includes):
|
|
if 'tests/style/BadIncludes' in enclosing_inclname:
|
|
return False # don't straighten the counterexample
|
|
if any(inc.inclname in oddly_ordered_inclnames for inc in includes):
|
|
return False # don't sort batches containing odd includes
|
|
if includes == sorted(includes, key=lambda inc: inc.sort_key(enclosing_inclname)):
|
|
return False # it's already sorted, avoid whitespace-only fixups
|
|
return True
|
|
|
|
# The content of the eventual output of this method.
|
|
output = []
|
|
|
|
# The current batch of includes to sort. This list only ever contains Include objects
|
|
# and whitespace OrdinaryCode objects.
|
|
batch = []
|
|
|
|
def flush_batch():
|
|
"""Sort the contents of `batch` and move it to `output`."""
|
|
|
|
assert all(isinstance(item, Include)
|
|
or (isinstance(item, OrdinaryCode) and "".join(item.lines).isspace())
|
|
for item in batch)
|
|
|
|
# Here we throw away the blank lines.
|
|
# `pretty_sorted_includes` puts them back.
|
|
includes = []
|
|
last_include_index = -1
|
|
for i, item in enumerate(batch):
|
|
if isinstance(item, Include):
|
|
includes.append(item)
|
|
last_include_index = i
|
|
cutoff = last_include_index + 1
|
|
|
|
if should_try_to_sort(includes):
|
|
output.extend(pretty_sorted_includes(includes) + batch[cutoff:])
|
|
else:
|
|
output.extend(batch)
|
|
del batch[:]
|
|
|
|
for kid in self.kids:
|
|
if isinstance(kid, CppBlock):
|
|
flush_batch()
|
|
output.append(kid.sorted(enclosing_inclname))
|
|
elif isinstance(kid, Include):
|
|
batch.append(kid)
|
|
else:
|
|
assert isinstance(kid, OrdinaryCode)
|
|
if kid.to_source().isspace():
|
|
batch.append(kid)
|
|
else:
|
|
flush_batch()
|
|
output.append(kid)
|
|
flush_batch()
|
|
|
|
result = CppBlock()
|
|
result.start = self.start
|
|
result.end = self.end
|
|
result.kids = output
|
|
return result
|
|
|
|
def to_source(self):
|
|
return self.start + ''.join(kid.to_source() for kid in self.kids) + self.end
|
|
|
|
|
|
class OrdinaryCode(object):
|
|
''' A list of lines of code that aren't #include/#if/#else/#endif lines. '''
|
|
def __init__(self, lines=None):
|
|
self.lines = lines if lines is not None else []
|
|
|
|
def is_style_relevant(self):
|
|
return False
|
|
|
|
def to_source(self):
|
|
return ''.join(self.lines)
|
|
|
|
|
|
# A "snippet" is one of:
|
|
#
|
|
# * Include - representing an #include line
|
|
# * CppBlock - a whole file or #if/#elif/#else block; contains a list of snippets
|
|
# * OrdinaryCode - representing lines of non-#include-relevant code
|
|
|
|
def read_file(f):
|
|
block_stack = [CppBlock()]
|
|
|
|
# Extract the #include statements as a tree of snippets.
|
|
for linenum, line in enumerate(f, start=1):
|
|
if line.lstrip().startswith('#'):
|
|
# Look for a |#include "..."| line.
|
|
m = re.match(r'(\s*#\s*include\s+)"([^"]*)"(.*)', line)
|
|
if m is not None:
|
|
prefix, inclname, suffix = m.groups()
|
|
block_stack[-1].kids.append(Include(prefix, inclname, suffix, linenum, is_system=False))
|
|
continue
|
|
|
|
# Look for a |#include <...>| line.
|
|
m = re.match(r'(\s*#\s*include\s+)<([^>]*)>(.*)', line)
|
|
if m is not None:
|
|
prefix, inclname, suffix = m.groups()
|
|
block_stack[-1].kids.append(Include(prefix, inclname, suffix, linenum, is_system=True))
|
|
continue
|
|
|
|
# Look for a |#{if,ifdef,ifndef}| line.
|
|
m = re.match(r'\s*#\s*(if|ifdef|ifndef)\b', line)
|
|
if m is not None:
|
|
# Open a new block.
|
|
new_block = CppBlock(line)
|
|
block_stack[-1].kids.append(new_block)
|
|
block_stack.append(new_block)
|
|
continue
|
|
|
|
# Look for a |#{elif,else}| line.
|
|
m = re.match(r'\s*#\s*(elif|else)\b', line)
|
|
if m is not None:
|
|
# Close the current block, and open an adjacent one.
|
|
block_stack.pop()
|
|
new_block = CppBlock(line)
|
|
block_stack[-1].kids.append(new_block)
|
|
block_stack.append(new_block)
|
|
continue
|
|
|
|
# Look for a |#endif| line.
|
|
m = re.match(r'\s*#\s*endif\b', line)
|
|
if m is not None:
|
|
# Close the current block.
|
|
block_stack.pop().end = line
|
|
if len(block_stack) == 0:
|
|
raise ValueError("#endif without #if at line " + str(linenum))
|
|
continue
|
|
|
|
# Otherwise, we have an ordinary line.
|
|
block_stack[-1].append_ordinary_line(line)
|
|
|
|
if len(block_stack) > 1:
|
|
raise ValueError("unmatched #if")
|
|
return block_stack[-1]
|
|
|
|
|
|
def check_file(filename, inclname, file_kind, code, all_inclnames, included_h_inclnames):
|
|
|
|
def check_include_statement(include):
|
|
'''Check the style of a single #include statement.'''
|
|
|
|
if include.is_system:
|
|
# Check it is not a known local file (in which case it's probably a system header).
|
|
if include.inclname in included_inclnames_to_ignore or \
|
|
include.inclname in all_inclnames:
|
|
error(filename, include.linenum,
|
|
include.quote() + ' should be included using',
|
|
'the #include "..." form')
|
|
|
|
else:
|
|
if include.inclname not in included_inclnames_to_ignore:
|
|
included_kind = FileKind.get(include.inclname)
|
|
|
|
# Check the #include path has the correct form.
|
|
if include.inclname not in all_inclnames:
|
|
error(filename, include.linenum,
|
|
include.quote() + ' is included using the wrong path;',
|
|
'did you forget a prefix, or is the file not yet committed?')
|
|
|
|
# Record inclusions of .h files for cycle detection later.
|
|
# (Exclude .tbl and .msg files.)
|
|
elif included_kind == FileKind.H or included_kind == FileKind.INL_H:
|
|
included_h_inclnames.add(include.inclname)
|
|
|
|
# Check a H file doesn't #include an INL_H file.
|
|
if file_kind == FileKind.H and included_kind == FileKind.INL_H:
|
|
error(filename, include.linenum,
|
|
'vanilla header includes an inline-header file ' + include.quote())
|
|
|
|
# Check a file doesn't #include itself. (We do this here because the cycle
|
|
# detection below doesn't detect this case.)
|
|
if inclname == include.inclname:
|
|
error(filename, include.linenum, 'the file includes itself')
|
|
|
|
def check_includes_order(include1, include2):
|
|
'''Check the ordering of two #include statements.'''
|
|
|
|
if include1.inclname in oddly_ordered_inclnames or \
|
|
include2.inclname in oddly_ordered_inclnames:
|
|
return
|
|
|
|
section1 = include1.section(inclname)
|
|
section2 = include2.section(inclname)
|
|
if (section1 > section2) or \
|
|
((section1 == section2) and (include1.inclname.lower() > include2.inclname.lower())):
|
|
error(filename, str(include1.linenum) + ':' + str(include2.linenum),
|
|
include1.quote() + ' should be included after ' + include2.quote())
|
|
|
|
# Check the extracted #include statements, both individually, and the ordering of
|
|
# adjacent pairs that live in the same block.
|
|
def pair_traverse(prev, this):
|
|
if isinstance(this, Include):
|
|
check_include_statement(this)
|
|
if isinstance(prev, Include):
|
|
check_includes_order(prev, this)
|
|
else:
|
|
kids = this.style_relevant_kids()
|
|
for prev2, this2 in zip([None] + kids[0:-1], kids):
|
|
pair_traverse(prev2, this2)
|
|
|
|
pair_traverse(None, code)
|
|
|
|
|
|
def find_cycles(all_inclnames, edges):
|
|
'''Find and draw any cycles.'''
|
|
|
|
SCCs = tarjan(all_inclnames, edges)
|
|
|
|
# The various sorted() calls below ensure the output is deterministic.
|
|
|
|
def draw_SCC(c):
|
|
cset = set(c)
|
|
drawn = set()
|
|
def draw(v, indent):
|
|
out(' ' * indent + ('-> ' if indent else ' ') + v)
|
|
if v in drawn:
|
|
return
|
|
drawn.add(v)
|
|
for succ in sorted(edges[v]):
|
|
if succ in cset:
|
|
draw(succ, indent + 1)
|
|
draw(sorted(c)[0], 0)
|
|
out('')
|
|
|
|
have_drawn_an_SCC = False
|
|
for scc in sorted(SCCs):
|
|
if len(scc) != 1:
|
|
if not have_drawn_an_SCC:
|
|
error('(multiple files)', None, 'header files form one or more cycles')
|
|
have_drawn_an_SCC = True
|
|
|
|
draw_SCC(scc)
|
|
|
|
|
|
# Tarjan's algorithm for finding the strongly connected components (SCCs) of a graph.
|
|
# https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
|
|
def tarjan(V, E):
|
|
vertex_index = {}
|
|
vertex_lowlink = {}
|
|
index = 0
|
|
S = []
|
|
all_SCCs = []
|
|
|
|
def strongconnect(v, index):
|
|
# Set the depth index for v to the smallest unused index
|
|
vertex_index[v] = index
|
|
vertex_lowlink[v] = index
|
|
index += 1
|
|
S.append(v)
|
|
|
|
# Consider successors of v
|
|
for w in E[v]:
|
|
if w not in vertex_index:
|
|
# Successor w has not yet been visited; recurse on it
|
|
index = strongconnect(w, index)
|
|
vertex_lowlink[v] = min(vertex_lowlink[v], vertex_lowlink[w])
|
|
elif w in S:
|
|
# Successor w is in stack S and hence in the current SCC
|
|
vertex_lowlink[v] = min(vertex_lowlink[v], vertex_index[w])
|
|
|
|
# If v is a root node, pop the stack and generate an SCC
|
|
if vertex_lowlink[v] == vertex_index[v]:
|
|
i = S.index(v)
|
|
scc = S[i:]
|
|
del S[i:]
|
|
all_SCCs.append(scc)
|
|
|
|
return index
|
|
|
|
for v in V:
|
|
if v not in vertex_index:
|
|
index = strongconnect(v, index)
|
|
|
|
return all_SCCs
|
|
|
|
|
|
def main():
|
|
if sys.argv[1:] == ["--fixup"]:
|
|
# Sort #include directives in-place. Fixup mode doesn't solve
|
|
# all possible silliness that the script checks for; it's just a
|
|
# hack for the common case where renaming a header causes style
|
|
# errors.
|
|
fixup = True
|
|
elif sys.argv[1:] == []:
|
|
fixup = False
|
|
else:
|
|
print("TEST-UNEXPECTED-FAIL | check_spidermonkey_style.py | unexpected command line options: " +
|
|
repr(sys.argv[1:]))
|
|
sys.exit(1)
|
|
|
|
ok = check_style(fixup)
|
|
|
|
if ok:
|
|
print('TEST-PASS | check_spidermonkey_style.py | ok')
|
|
else:
|
|
print('TEST-UNEXPECTED-FAIL | check_spidermonkey_style.py | ' +
|
|
'actual output does not match expected output; diff is above.')
|
|
print('TEST-UNEXPECTED-FAIL | check_spidermonkey_style.py | ' +
|
|
'Hint: If the problem is that you renamed a header, and many #includes ' +
|
|
'are no longer in alphabetical order, commit your work and then try ' +
|
|
'`check_spidermonkey_style.py --fixup`. ' +
|
|
'You need to commit first because --fixup modifies your files in place.')
|
|
|
|
sys.exit(0 if ok else 1)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|