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annotate contrib/python-zstandard/make_cffi.py @ 42070:675775c33ab6

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zstandard: vendor python-zstandard 0.11 The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.8. The old version was 1.3.6. This should result in some minor performance wins. test-check-py3-compat.t was updated to reflect now-passing tests on Python 3.8. Some HTTP tests were updated to reflect new zstd compression output. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D6199
author Gregory Szorc <gregory.szorc@gmail.com>
date Thu, 04 Apr 2019 17:34:43 -0700
parents 73fef626dae3
children 69de49c4e39c
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1 # Copyright (c) 2016-present, Gregory Szorc
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2 # All rights reserved.
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3 #
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4 # This software may be modified and distributed under the terms
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5 # of the BSD license. See the LICENSE file for details.
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6
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7 from __future__ import absolute_import
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8
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9 import cffi
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10 import distutils.ccompiler
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11 import os
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12 import re
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13 import subprocess
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14 import tempfile
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15
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16
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17 HERE = os.path.abspath(os.path.dirname(__file__))
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18
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19 SOURCES = ['zstd/%s' % p for p in (
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20 'common/debug.c',
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21 'common/entropy_common.c',
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22 'common/error_private.c',
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23 'common/fse_decompress.c',
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24 'common/pool.c',
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25 'common/threading.c',
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26 'common/xxhash.c',
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27 'common/zstd_common.c',
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28 'compress/fse_compress.c',
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29 'compress/hist.c',
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30 'compress/huf_compress.c',
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31 'compress/zstd_compress.c',
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32 'compress/zstd_double_fast.c',
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33 'compress/zstd_fast.c',
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34 'compress/zstd_lazy.c',
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35 'compress/zstd_ldm.c',
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36 'compress/zstd_opt.c',
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37 'compress/zstdmt_compress.c',
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38 'decompress/huf_decompress.c',
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39 'decompress/zstd_ddict.c',
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40 'decompress/zstd_decompress.c',
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41 'decompress/zstd_decompress_block.c',
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42 'dictBuilder/cover.c',
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43 'dictBuilder/fastcover.c',
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44 'dictBuilder/divsufsort.c',
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45 'dictBuilder/zdict.c',
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46 )]
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47
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48 # Headers whose preprocessed output will be fed into cdef().
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49 HEADERS = [os.path.join(HERE, 'zstd', *p) for p in (
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50 ('zstd.h',),
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51 ('dictBuilder', 'zdict.h'),
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52 )]
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53
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54 INCLUDE_DIRS = [os.path.join(HERE, d) for d in (
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55 'zstd',
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56 'zstd/common',
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57 'zstd/compress',
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58 'zstd/decompress',
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59 'zstd/dictBuilder',
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60 )]
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61
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62 # cffi can't parse some of the primitives in zstd.h. So we invoke the
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63 # preprocessor and feed its output into cffi.
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64 compiler = distutils.ccompiler.new_compiler()
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65
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66 # Needed for MSVC.
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67 if hasattr(compiler, 'initialize'):
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68 compiler.initialize()
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69
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70 # Distutils doesn't set compiler.preprocessor, so invoke the preprocessor
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71 # manually.
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72 if compiler.compiler_type == 'unix':
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73 args = list(compiler.executables['compiler'])
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74 args.extend([
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75 '-E',
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76 '-DZSTD_STATIC_LINKING_ONLY',
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77 '-DZDICT_STATIC_LINKING_ONLY',
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78 ])
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79 elif compiler.compiler_type == 'msvc':
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80 args = [compiler.cc]
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81 args.extend([
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82 '/EP',
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83 '/DZSTD_STATIC_LINKING_ONLY',
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84 '/DZDICT_STATIC_LINKING_ONLY',
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85 ])
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86 else:
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87 raise Exception('unsupported compiler type: %s' % compiler.compiler_type)
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88
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89 def preprocess(path):
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90 with open(path, 'rb') as fh:
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91 lines = []
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92 it = iter(fh)
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93
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94 for l in it:
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95 # zstd.h includes <stddef.h>, which is also included by cffi's
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96 # boilerplate. This can lead to duplicate declarations. So we strip
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97 # this include from the preprocessor invocation.
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98 #
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99 # The same things happens for including zstd.h, so give it the same
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100 # treatment.
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101 #
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102 # We define ZSTD_STATIC_LINKING_ONLY, which is redundant with the inline
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103 # #define in zstdmt_compress.h and results in a compiler warning. So drop
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104 # the inline #define.
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105 if l.startswith((b'#include <stddef.h>',
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106 b'#include "zstd.h"',
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107 b'#define ZSTD_STATIC_LINKING_ONLY')):
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108 continue
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109
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110 # ZSTDLIB_API may not be defined if we dropped zstd.h. It isn't
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111 # important so just filter it out.
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112 if l.startswith(b'ZSTDLIB_API'):
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113 l = l[len(b'ZSTDLIB_API '):]
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114
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115 lines.append(l)
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116
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117 fd, input_file = tempfile.mkstemp(suffix='.h')
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118 os.write(fd, b''.join(lines))
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119 os.close(fd)
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120
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121 try:
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122 process = subprocess.Popen(args + [input_file], stdout=subprocess.PIPE)
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123 output = process.communicate()[0]
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124 ret = process.poll()
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125 if ret:
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126 raise Exception('preprocessor exited with error')
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127
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128 return output
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129 finally:
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130 os.unlink(input_file)
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131
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132
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133 def normalize_output(output):
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134 lines = []
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135 for line in output.splitlines():
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136 # CFFI's parser doesn't like __attribute__ on UNIX compilers.
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137 if line.startswith(b'__attribute__ ((visibility ("default"))) '):
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138 line = line[len(b'__attribute__ ((visibility ("default"))) '):]
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139
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140 if line.startswith(b'__attribute__((deprecated('):
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141 continue
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142 elif b'__declspec(deprecated(' in line:
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143 continue
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144
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145 lines.append(line)
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146
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147 return b'\n'.join(lines)
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148
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149
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150 ffi = cffi.FFI()
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151 # zstd.h uses a possible undefined MIN(). Define it until
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152 # https://github.com/facebook/zstd/issues/976 is fixed.
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153 # *_DISABLE_DEPRECATE_WARNINGS prevents the compiler from emitting a warning
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154 # when cffi uses the function. Since we statically link against zstd, even
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155 # if we use the deprecated functions it shouldn't be a huge problem.
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156 ffi.set_source('_zstd_cffi', '''
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157 #define MIN(a,b) ((a)<(b) ? (a) : (b))
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158 #define ZSTD_STATIC_LINKING_ONLY
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159 #include <zstd.h>
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160 #define ZDICT_STATIC_LINKING_ONLY
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161 #define ZDICT_DISABLE_DEPRECATE_WARNINGS
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162 #include <zdict.h>
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163 ''', sources=SOURCES,
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164 include_dirs=INCLUDE_DIRS,
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165 extra_compile_args=['-DZSTD_MULTITHREAD'])
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166
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167 DEFINE = re.compile(b'^\\#define ([a-zA-Z0-9_]+) ')
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168
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169 sources = []
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170
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171 # Feed normalized preprocessor output for headers into the cdef parser.
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172 for header in HEADERS:
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173 preprocessed = preprocess(header)
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174 sources.append(normalize_output(preprocessed))
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175
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176 # #define's are effectively erased as part of going through preprocessor.
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177 # So perform a manual pass to re-add those to the cdef source.
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178 with open(header, 'rb') as fh:
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179 for line in fh:
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180 line = line.strip()
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181 m = DEFINE.match(line)
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182 if not m:
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183 continue
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184
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185 if m.group(1) == b'ZSTD_STATIC_LINKING_ONLY':
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186 continue
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187
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188 # The parser doesn't like some constants with complex values.
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189 if m.group(1) in (b'ZSTD_LIB_VERSION', b'ZSTD_VERSION_STRING'):
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190 continue
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191
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192 # The ... is magic syntax by the cdef parser to resolve the
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193 # value at compile time.
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194 sources.append(m.group(0) + b' ...')
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195
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196 cdeflines = b'\n'.join(sources).splitlines()
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197 cdeflines = [l for l in cdeflines if l.strip()]
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198 ffi.cdef(b'\n'.join(cdeflines).decode('latin1'))
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199
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200 if __name__ == '__main__':
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201 ffi.compile()