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annotate Lib/py_compile.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 6da717bfe425
children c7f04c09dc56
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Routine to "compile" a .py file to a .pyc (or .pyo) file.
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2
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3 This module has intimate knowledge of the format of .pyc files.
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4 """
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5
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6 import __builtin__
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7 import imp
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8 import marshal
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9 import os
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10 import sys
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11 import traceback
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12
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13 MAGIC = imp.get_magic()
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14
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15 __all__ = ["compile", "main", "PyCompileError"]
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16
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17
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18 class PyCompileError(Exception):
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19 """Exception raised when an error occurs while attempting to
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20 compile the file.
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21
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22 To raise this exception, use
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23
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24 raise PyCompileError(exc_type,exc_value,file[,msg])
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25
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26 where
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27
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28 exc_type: exception type to be used in error message
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29 type name can be accesses as class variable
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30 'exc_type_name'
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31
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32 exc_value: exception value to be used in error message
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33 can be accesses as class variable 'exc_value'
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34
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35 file: name of file being compiled to be used in error message
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36 can be accesses as class variable 'file'
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37
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38 msg: string message to be written as error message
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39 If no value is given, a default exception message will be given,
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40 consistent with 'standard' py_compile output.
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41 message (or default) can be accesses as class variable 'msg'
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42
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43 """
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44
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45 def __init__(self, exc_type, exc_value, file, msg=''):
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46 exc_type_name = exc_type.__name__
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47 if exc_type is SyntaxError:
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48 tbtext = ''.join(traceback.format_exception_only(exc_type, exc_value))
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49 errmsg = tbtext.replace('File "<string>"', 'File "%s"' % file)
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50 else:
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51 errmsg = "Sorry: %s: %s" % (exc_type_name,exc_value)
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52
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53 Exception.__init__(self,msg or errmsg,exc_type_name,exc_value,file)
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54
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55 self.exc_type_name = exc_type_name
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56 self.exc_value = exc_value
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57 self.file = file
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58 self.msg = msg or errmsg
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59
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60 def __str__(self):
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61 return self.msg
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62
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63
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64 def wr_long(f, x):
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65 """Internal; write a 32-bit int to a file in little-endian order."""
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66 f.write(chr( x & 0xff))
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67 f.write(chr((x >> 8) & 0xff))
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68 f.write(chr((x >> 16) & 0xff))
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69 f.write(chr((x >> 24) & 0xff))
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70
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71 def compile(file, cfile=None, dfile=None, doraise=False):
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72 """Byte-compile one Python source file to Python bytecode.
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73
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74 Arguments:
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75
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76 file: source filename
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77 cfile: target filename; defaults to source with 'c' or 'o' appended
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78 ('c' normally, 'o' in optimizing mode, giving .pyc or .pyo)
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79 dfile: purported filename; defaults to source (this is the filename
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80 that will show up in error messages)
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81 doraise: flag indicating whether or not an exception should be
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82 raised when a compile error is found. If an exception
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83 occurs and this flag is set to False, a string
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84 indicating the nature of the exception will be printed,
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85 and the function will return to the caller. If an
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86 exception occurs and this flag is set to True, a
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87 PyCompileError exception will be raised.
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88
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89 Note that it isn't necessary to byte-compile Python modules for
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90 execution efficiency -- Python itself byte-compiles a module when
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91 it is loaded, and if it can, writes out the bytecode to the
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92 corresponding .pyc (or .pyo) file.
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93
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94 However, if a Python installation is shared between users, it is a
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95 good idea to byte-compile all modules upon installation, since
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96 other users may not be able to write in the source directories,
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97 and thus they won't be able to write the .pyc/.pyo file, and then
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98 they would be byte-compiling every module each time it is loaded.
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99 This can slow down program start-up considerably.
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100
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101 See compileall.py for a script/module that uses this module to
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102 byte-compile all installed files (or all files in selected
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103 directories).
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104
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105 """
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106 with open(file, 'U') as f:
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107 try:
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108 timestamp = long(os.fstat(f.fileno()).st_mtime)
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109 except AttributeError:
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110 timestamp = long(os.stat(file).st_mtime)
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111 codestring = f.read()
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112 try:
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113 codeobject = __builtin__.compile(codestring, dfile or file,'exec')
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114 except Exception,err:
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115 py_exc = PyCompileError(err.__class__,err.args,dfile or file)
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116 if doraise:
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117 raise py_exc
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118 else:
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119 sys.stderr.write(py_exc.msg + '\n')
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120 return
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121 if cfile is None:
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122 cfile = file + (__debug__ and 'c' or 'o')
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123 with open(cfile, 'wb') as fc:
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124 fc.write('\0\0\0\0')
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125 wr_long(fc, timestamp)
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126 marshal.dump(codeobject, fc)
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127 fc.flush()
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128 fc.seek(0, 0)
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129 fc.write(MAGIC)
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130
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131 def main(args=None):
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132 """Compile several source files.
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133
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134 The files named in 'args' (or on the command line, if 'args' is
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135 not specified) are compiled and the resulting bytecode is cached
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136 in the normal manner. This function does not search a directory
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137 structure to locate source files; it only compiles files named
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138 explicitly. If '-' is the only parameter in args, the list of
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139 files is taken from standard input.
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140
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Fred Drake <fdrake@acm.org>
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141 """
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142 if args is None:
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143 args = sys.argv[1:]
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144 rv = 0
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145 if args == ['-']:
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146 while True:
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147 filename = sys.stdin.readline()
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148 if not filename:
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149 break
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150 filename = filename.rstrip('\n')
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151 try:
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152 compile(filename, doraise=True)
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153 except PyCompileError as error:
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154 rv = 1
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155 sys.stderr.write("%s\n" % error.msg)
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156 except IOError as error:
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157 rv = 1
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158 sys.stderr.write("%s\n" % error)
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159 else:
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160 for filename in args:
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161 try:
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162 compile(filename, doraise=True)
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Matthias Klose <doko@ubuntu.com>
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163 except PyCompileError as error:
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164 # return value to indicate at least one failure
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165 rv = 1
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166 sys.stderr.write(error.msg)
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Georg Brandl <georg@python.org>
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167 return rv
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Tim Peters <tim.peters@gmail.com>
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168
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169 if __name__ == "__main__":
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170 sys.exit(main())