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annotate contrib/python-zstandard/make_cffi.py @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents b1fb341d8a61
children 73fef626dae3
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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/entropy_common.c',
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21 'common/error_private.c',
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22 'common/fse_decompress.c',
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23 'common/pool.c',
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24 'common/threading.c',
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25 'common/xxhash.c',
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26 'common/zstd_common.c',
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27 'compress/fse_compress.c',
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28 'compress/huf_compress.c',
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29 'compress/zstd_compress.c',
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30 'compress/zstd_double_fast.c',
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31 'compress/zstd_fast.c',
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32 'compress/zstd_lazy.c',
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33 'compress/zstd_ldm.c',
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34 'compress/zstd_opt.c',
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35 'compress/zstdmt_compress.c',
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36 'decompress/huf_decompress.c',
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37 'decompress/zstd_decompress.c',
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38 'dictBuilder/cover.c',
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39 'dictBuilder/divsufsort.c',
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40 'dictBuilder/zdict.c',
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41 )]
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42
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43 # Headers whose preprocessed output will be fed into cdef().
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44 HEADERS = [os.path.join(HERE, 'zstd', *p) for p in (
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45 ('zstd.h',),
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46 ('dictBuilder', 'zdict.h'),
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47 )]
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48
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49 INCLUDE_DIRS = [os.path.join(HERE, d) for d in (
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50 'zstd',
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51 'zstd/common',
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52 'zstd/compress',
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53 'zstd/decompress',
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54 'zstd/dictBuilder',
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55 )]
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56
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57 # cffi can't parse some of the primitives in zstd.h. So we invoke the
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58 # preprocessor and feed its output into cffi.
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59 compiler = distutils.ccompiler.new_compiler()
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60
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61 # Needed for MSVC.
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62 if hasattr(compiler, 'initialize'):
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63 compiler.initialize()
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64
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65 # Distutils doesn't set compiler.preprocessor, so invoke the preprocessor
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66 # manually.
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67 if compiler.compiler_type == 'unix':
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68 args = list(compiler.executables['compiler'])
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69 args.extend([
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70 '-E',
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71 '-DZSTD_STATIC_LINKING_ONLY',
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72 '-DZDICT_STATIC_LINKING_ONLY',
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73 ])
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74 elif compiler.compiler_type == 'msvc':
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75 args = [compiler.cc]
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76 args.extend([
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77 '/EP',
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78 '/DZSTD_STATIC_LINKING_ONLY',
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79 '/DZDICT_STATIC_LINKING_ONLY',
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80 ])
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81 else:
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82 raise Exception('unsupported compiler type: %s' % compiler.compiler_type)
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83
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84 def preprocess(path):
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85 with open(path, 'rb') as fh:
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86 lines = []
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87 it = iter(fh)
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88
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89 for l in it:
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90 # zstd.h includes <stddef.h>, which is also included by cffi's
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91 # boilerplate. This can lead to duplicate declarations. So we strip
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92 # this include from the preprocessor invocation.
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93 #
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94 # The same things happens for including zstd.h, so give it the same
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95 # treatment.
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96 #
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97 # We define ZSTD_STATIC_LINKING_ONLY, which is redundant with the inline
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98 # #define in zstdmt_compress.h and results in a compiler warning. So drop
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99 # the inline #define.
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100 if l.startswith((b'#include <stddef.h>',
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101 b'#include "zstd.h"',
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102 b'#define ZSTD_STATIC_LINKING_ONLY')):
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103 continue
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104
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105 # ZSTDLIB_API may not be defined if we dropped zstd.h. It isn't
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106 # important so just filter it out.
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107 if l.startswith(b'ZSTDLIB_API'):
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108 l = l[len(b'ZSTDLIB_API '):]
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109
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110 lines.append(l)
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111
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112 fd, input_file = tempfile.mkstemp(suffix='.h')
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113 os.write(fd, b''.join(lines))
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114 os.close(fd)
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115
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116 try:
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117 process = subprocess.Popen(args + [input_file], stdout=subprocess.PIPE)
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118 output = process.communicate()[0]
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119 ret = process.poll()
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120 if ret:
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121 raise Exception('preprocessor exited with error')
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122
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123 return output
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124 finally:
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125 os.unlink(input_file)
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126
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127
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128 def normalize_output(output):
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129 lines = []
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130 for line in output.splitlines():
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131 # CFFI's parser doesn't like __attribute__ on UNIX compilers.
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132 if line.startswith(b'__attribute__ ((visibility ("default"))) '):
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133 line = line[len(b'__attribute__ ((visibility ("default"))) '):]
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134
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135 if line.startswith(b'__attribute__((deprecated('):
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136 continue
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137 elif b'__declspec(deprecated(' in line:
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138 continue
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139
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140 lines.append(line)
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141
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142 return b'\n'.join(lines)
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143
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144
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145 ffi = cffi.FFI()
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146 # zstd.h uses a possible undefined MIN(). Define it until
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147 # https://github.com/facebook/zstd/issues/976 is fixed.
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148 # *_DISABLE_DEPRECATE_WARNINGS prevents the compiler from emitting a warning
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149 # when cffi uses the function. Since we statically link against zstd, even
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150 # if we use the deprecated functions it shouldn't be a huge problem.
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151 ffi.set_source('_zstd_cffi', '''
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152 #define MIN(a,b) ((a)<(b) ? (a) : (b))
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153 #define ZSTD_STATIC_LINKING_ONLY
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154 #include <zstd.h>
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155 #define ZDICT_STATIC_LINKING_ONLY
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156 #define ZDICT_DISABLE_DEPRECATE_WARNINGS
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157 #include <zdict.h>
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158 ''', sources=SOURCES,
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159 include_dirs=INCLUDE_DIRS,
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160 extra_compile_args=['-DZSTD_MULTITHREAD'])
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161
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162 DEFINE = re.compile(b'^\\#define ([a-zA-Z0-9_]+) ')
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163
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164 sources = []
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165
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166 # Feed normalized preprocessor output for headers into the cdef parser.
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167 for header in HEADERS:
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168 preprocessed = preprocess(header)
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169 sources.append(normalize_output(preprocessed))
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170
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171 # #define's are effectively erased as part of going through preprocessor.
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172 # So perform a manual pass to re-add those to the cdef source.
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173 with open(header, 'rb') as fh:
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174 for line in fh:
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175 line = line.strip()
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176 m = DEFINE.match(line)
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177 if not m:
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178 continue
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179
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180 if m.group(1) == b'ZSTD_STATIC_LINKING_ONLY':
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181 continue
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182
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183 # The parser doesn't like some constants with complex values.
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184 if m.group(1) in (b'ZSTD_LIB_VERSION', b'ZSTD_VERSION_STRING'):
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185 continue
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186
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187 # The ... is magic syntax by the cdef parser to resolve the
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188 # value at compile time.
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189 sources.append(m.group(0) + b' ...')
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190
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191 cdeflines = b'\n'.join(sources).splitlines()
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192 cdeflines = [l for l in cdeflines if l.strip()]
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193 ffi.cdef(b'\n'.join(cdeflines).decode('latin1'))
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194
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195 if __name__ == '__main__':
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196 ffi.compile()