contrib/python-zstandard/setup_zstd.py

dagutil: use revlog.parentrevs() for resolving parent revisions

And remove parents() since it is no longer used.

revlog.parentrevs() is almost the same as parents(). The main
difference is that parentrevs() can return nullrev. dagop.headrevs()
already handles nullrev. We add an inline check for nullrev in the
other call site to account for the difference.

.. api:: parents() removed from dagutil classes

   Use parentrevs() on the storage object instead.

Differential Revision: https://phab.mercurial-scm.org/D4328

# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.

import distutils.ccompiler
import os
import sys

from distutils.extension import Extension


zstd_sources = ['zstd/%s' % p for p in (
    'common/entropy_common.c',
    'common/error_private.c',
    'common/fse_decompress.c',
    'common/pool.c',
    'common/threading.c',
    'common/xxhash.c',
    'common/zstd_common.c',
    'compress/fse_compress.c',
    'compress/huf_compress.c',
    'compress/zstd_compress.c',
    'compress/zstd_double_fast.c',
    'compress/zstd_fast.c',
    'compress/zstd_lazy.c',
    'compress/zstd_ldm.c',
    'compress/zstd_opt.c',
    'compress/zstdmt_compress.c',
    'decompress/huf_decompress.c',
    'decompress/zstd_decompress.c',
    'dictBuilder/cover.c',
    'dictBuilder/divsufsort.c',
    'dictBuilder/zdict.c',
)]

zstd_sources_legacy = ['zstd/%s' % p for p in (
    'deprecated/zbuff_common.c',
    'deprecated/zbuff_compress.c',
    'deprecated/zbuff_decompress.c',
    'legacy/zstd_v01.c',
    'legacy/zstd_v02.c',
    'legacy/zstd_v03.c',
    'legacy/zstd_v04.c',
    'legacy/zstd_v05.c',
    'legacy/zstd_v06.c',
    'legacy/zstd_v07.c'
)]

zstd_includes = [
    'zstd',
    'zstd/common',
    'zstd/compress',
    'zstd/decompress',
    'zstd/dictBuilder',
]

zstd_includes_legacy = [
    'zstd/deprecated',
    'zstd/legacy',
]

ext_includes = [
    'c-ext',
    'zstd/common',
]

ext_sources = [
    'zstd/common/pool.c',
    'zstd/common/threading.c',
    'zstd.c',
    'c-ext/bufferutil.c',
    'c-ext/compressiondict.c',
    'c-ext/compressobj.c',
    'c-ext/compressor.c',
    'c-ext/compressoriterator.c',
    'c-ext/compressionparams.c',
    'c-ext/compressionreader.c',
    'c-ext/compressionwriter.c',
    'c-ext/constants.c',
    'c-ext/decompressobj.c',
    'c-ext/decompressor.c',
    'c-ext/decompressoriterator.c',
    'c-ext/decompressionreader.c',
    'c-ext/decompressionwriter.c',
    'c-ext/frameparams.c',
]

zstd_depends = [
    'c-ext/python-zstandard.h',
]


def get_c_extension(support_legacy=False, system_zstd=False, name='zstd',
                    warnings_as_errors=False):
    """Obtain a distutils.extension.Extension for the C extension."""
    root = os.path.abspath(os.path.dirname(__file__))

    sources = set([os.path.join(root, p) for p in ext_sources])
    if not system_zstd:
        sources.update([os.path.join(root, p) for p in zstd_sources])
        if support_legacy:
            sources.update([os.path.join(root, p) for p in zstd_sources_legacy])
    sources = list(sources)

    include_dirs = set([os.path.join(root, d) for d in ext_includes])
    if not system_zstd:
        include_dirs.update([os.path.join(root, d) for d in zstd_includes])
        if support_legacy:
            include_dirs.update([os.path.join(root, d) for d in zstd_includes_legacy])
    include_dirs = list(include_dirs)

    depends = [os.path.join(root, p) for p in zstd_depends]

    compiler = distutils.ccompiler.new_compiler()

    # Needed for MSVC.
    if hasattr(compiler, 'initialize'):
        compiler.initialize()

    if compiler.compiler_type == 'unix':
        compiler_type = 'unix'
    elif compiler.compiler_type == 'msvc':
        compiler_type = 'msvc'
    elif compiler.compiler_type == 'mingw32':
        compiler_type = 'mingw32'
    else:
        raise Exception('unhandled compiler type: %s' %
                        compiler.compiler_type)

    extra_args = ['-DZSTD_MULTITHREAD']

    if not system_zstd:
        extra_args.append('-DZSTDLIB_VISIBILITY=')
        extra_args.append('-DZDICTLIB_VISIBILITY=')
        extra_args.append('-DZSTDERRORLIB_VISIBILITY=')

        if compiler_type == 'unix':
            extra_args.append('-fvisibility=hidden')

    if not system_zstd and support_legacy:
        extra_args.append('-DZSTD_LEGACY_SUPPORT=1')

    if warnings_as_errors:
        if compiler_type in ('unix', 'mingw32'):
            extra_args.append('-Werror')
        elif compiler_type == 'msvc':
            extra_args.append('/WX')
        else:
            assert False

    libraries = ['zstd'] if system_zstd else []

    # TODO compile with optimizations.
    return Extension(name, sources,
                     include_dirs=include_dirs,
                     depends=depends,
                     extra_compile_args=extra_args,
                     libraries=libraries)