Mercurial > cpython-lru_cache-weakref
annotate Lib/py_compile.py @ 79691:05c8928362ee
Merge __next__ method link fixes with 3.3.
| author | Ezio Melotti <ezio.melotti@gmail.com> |
|---|---|
| date | Fri, 12 Oct 2012 13:46:37 +0300 |
| parents | 87331661042b |
| children | 7d69d04522e3 |
| rev | line source |
|---|---|
| 7109 | 1 """Routine to "compile" a .py file to a .pyc (or .pyo) file. |
| 2 | |
| 3 This module has intimate knowledge of the format of .pyc files. | |
| 4 """ | |
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5 |
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6 import builtins |
| 60648 | 7 import errno |
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8 import imp |
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9 import marshal |
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10 import os |
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11 import sys |
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12 import tokenize |
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13 import traceback |
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14 |
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15 MAGIC = imp.get_magic() |
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16 |
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17 __all__ = ["compile", "main", "PyCompileError"] |
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18 |
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19 |
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20 class PyCompileError(Exception): |
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21 """Exception raised when an error occurs while attempting to |
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22 compile the file. |
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23 |
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24 To raise this exception, use |
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25 |
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26 raise PyCompileError(exc_type,exc_value,file[,msg]) |
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27 |
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28 where |
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29 |
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30 exc_type: exception type to be used in error message |
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31 type name can be accesses as class variable |
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32 'exc_type_name' |
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33 |
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34 exc_value: exception value to be used in error message |
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35 can be accesses as class variable 'exc_value' |
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36 |
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37 file: name of file being compiled to be used in error message |
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38 can be accesses as class variable 'file' |
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39 |
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40 msg: string message to be written as error message |
| 60648 | 41 If no value is given, a default exception message will be |
| 42 given, consistent with 'standard' py_compile output. | |
| 43 message (or default) can be accesses as class variable | |
| 44 'msg' | |
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45 |
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46 """ |
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47 |
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48 def __init__(self, exc_type, exc_value, file, msg=''): |
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49 exc_type_name = exc_type.__name__ |
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50 if exc_type is SyntaxError: |
| 60648 | 51 tbtext = ''.join(traceback.format_exception_only( |
| 52 exc_type, exc_value)) | |
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53 errmsg = tbtext.replace('File "<string>"', 'File "%s"' % file) |
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54 else: |
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55 errmsg = "Sorry: %s: %s" % (exc_type_name,exc_value) |
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56 |
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57 Exception.__init__(self,msg or errmsg,exc_type_name,exc_value,file) |
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58 |
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59 self.exc_type_name = exc_type_name |
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60 self.exc_value = exc_value |
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61 self.file = file |
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62 self.msg = msg or errmsg |
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63 |
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64 def __str__(self): |
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65 return self.msg |
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66 |
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67 |
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68 def wr_long(f, x): |
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69 """Internal; write a 32-bit int to a file in little-endian order.""" |
| 60648 | 70 f.write(bytes([x & 0xff, |
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71 (x >> 8) & 0xff, |
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72 (x >> 16) & 0xff, |
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73 (x >> 24) & 0xff])) |
| 7109 | 74 |
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75 def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1): |
| 7109 | 76 """Byte-compile one Python source file to Python bytecode. |
| 77 | |
| 60648 | 78 :param file: The source file name. |
| 79 :param cfile: The target byte compiled file name. When not given, this | |
| 80 defaults to the PEP 3147 location. | |
| 81 :param dfile: Purported file name, i.e. the file name that shows up in | |
| 82 error messages. Defaults to the source file name. | |
| 83 :param doraise: Flag indicating whether or not an exception should be | |
| 84 raised when a compile error is found. If an exception occurs and this | |
| 85 flag is set to False, a string indicating the nature of the exception | |
| 86 will be printed, and the function will return to the caller. If an | |
| 87 exception occurs and this flag is set to True, a PyCompileError | |
| 88 exception will be raised. | |
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89 :param optimize: The optimization level for the compiler. Valid values |
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90 are -1, 0, 1 and 2. A value of -1 means to use the optimization |
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91 level of the current interpreter, as given by -O command line options. |
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92 |
| 60648 | 93 :return: Path to the resulting byte compiled file. |
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94 |
| 7109 | 95 Note that it isn't necessary to byte-compile Python modules for |
| 96 execution efficiency -- Python itself byte-compiles a module when | |
| 97 it is loaded, and if it can, writes out the bytecode to the | |
| 98 corresponding .pyc (or .pyo) file. | |
| 99 | |
| 100 However, if a Python installation is shared between users, it is a | |
| 101 good idea to byte-compile all modules upon installation, since | |
| 102 other users may not be able to write in the source directories, | |
| 103 and thus they won't be able to write the .pyc/.pyo file, and then | |
| 104 they would be byte-compiling every module each time it is loaded. | |
| 105 This can slow down program start-up considerably. | |
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106 |
| 7109 | 107 See compileall.py for a script/module that uses this module to |
| 108 byte-compile all installed files (or all files in selected | |
| 109 directories). | |
| 110 """ | |
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111 with tokenize.open(file) as f: |
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112 try: |
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113 st = os.fstat(f.fileno()) |
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114 except AttributeError: |
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115 st = os.stat(file) |
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116 timestamp = int(st.st_mtime) |
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117 size = st.st_size & 0xFFFFFFFF |
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118 codestring = f.read() |
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119 try: |
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120 codeobject = builtins.compile(codestring, dfile or file, 'exec', |
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121 optimize=optimize) |
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122 except Exception as err: |
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123 py_exc = PyCompileError(err.__class__, err, dfile or file) |
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124 if doraise: |
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125 raise py_exc |
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126 else: |
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127 sys.stderr.write(py_exc.msg + '\n') |
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128 return |
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129 if cfile is None: |
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130 if optimize >= 0: |
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131 cfile = imp.cache_from_source(file, debug_override=not optimize) |
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132 else: |
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133 cfile = imp.cache_from_source(file) |
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134 try: |
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135 dirname = os.path.dirname(cfile) |
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136 if dirname: |
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137 os.makedirs(dirname) |
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138 except OSError as error: |
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139 if error.errno != errno.EEXIST: |
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140 raise |
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141 with open(cfile, 'wb') as fc: |
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142 fc.write(b'\0\0\0\0') |
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143 wr_long(fc, timestamp) |
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144 wr_long(fc, size) |
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145 marshal.dump(codeobject, fc) |
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146 fc.flush() |
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147 fc.seek(0, 0) |
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148 fc.write(MAGIC) |
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150 |
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151 def main(args=None): |
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152 """Compile several source files. |
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153 |
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154 The files named in 'args' (or on the command line, if 'args' is |
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155 not specified) are compiled and the resulting bytecode is cached |
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156 in the normal manner. This function does not search a directory |
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157 structure to locate source files; it only compiles files named |
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158 explicitly. If '-' is the only parameter in args, the list of |
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159 files is taken from standard input. |
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160 |
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161 """ |
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162 if args is None: |
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163 args = sys.argv[1:] |
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164 rv = 0 |
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165 if args == ['-']: |
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166 while True: |
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167 filename = sys.stdin.readline() |
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168 if not filename: |
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169 break |
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170 filename = filename.rstrip('\n') |
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171 try: |
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172 compile(filename, doraise=True) |
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173 except PyCompileError as error: |
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174 rv = 1 |
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175 sys.stderr.write("%s\n" % error.msg) |
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176 except IOError as error: |
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177 rv = 1 |
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178 sys.stderr.write("%s\n" % error) |
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179 else: |
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180 for filename in args: |
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181 try: |
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182 compile(filename, doraise=True) |
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183 except PyCompileError as error: |
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184 # return value to indicate at least one failure |
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185 rv = 1 |
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186 sys.stderr.write(error.msg) |
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187 return rv |
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188 |
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189 if __name__ == "__main__": |
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190 sys.exit(main()) |