Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/objgraph.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents fcfe324663a6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #! /usr/bin/env python3
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2
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3 # objgraph
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4 #
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5 # Read "nm -o" input (on IRIX: "nm -Bo") of a set of libraries or modules
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6 # and print various interesting listings, such as:
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7 #
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8 # - which names are used but not defined in the set (and used where),
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9 # - which names are defined in the set (and where),
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10 # - which modules use which other modules,
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11 # - which modules are used by which other modules.
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12 #
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13 # Usage: objgraph [-cdu] [file] ...
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14 # -c: print callers per objectfile
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15 # -d: print callees per objectfile
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16 # -u: print usage of undefined symbols
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17 # If none of -cdu is specified, all are assumed.
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18 # Use "nm -o" to generate the input (on IRIX: "nm -Bo"),
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19 # e.g.: nm -o /lib/libc.a | objgraph
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20
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21
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22 import sys
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23 import os
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24 import getopt
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25 import re
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26
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27 # Types of symbols.
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28 #
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29 definitions = 'TRGDSBAEC'
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30 externals = 'UV'
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31 ignore = 'Nntrgdsbavuc'
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32
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33 # Regular expression to parse "nm -o" output.
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34 #
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35 matcher = re.compile('(.*):\t?........ (.) (.*)$')
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36
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37 # Store "item" in "dict" under "key".
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38 # The dictionary maps keys to lists of items.
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39 # If there is no list for the key yet, it is created.
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40 #
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41 def store(dict, key, item):
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42 if key in dict:
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43 dict[key].append(item)
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44 else:
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45 dict[key] = [item]
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46
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47 # Return a flattened version of a list of strings: the concatenation
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48 # of its elements with intervening spaces.
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49 #
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50 def flat(list):
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51 s = ''
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52 for item in list:
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53 s = s + ' ' + item
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54 return s[1:]
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55
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56 # Global variables mapping defined/undefined names to files and back.
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57 #
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58 file2undef = {}
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59 def2file = {}
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60 file2def = {}
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61 undef2file = {}
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62
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63 # Read one input file and merge the data into the tables.
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64 # Argument is an open file.
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65 #
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66 def readinput(fp):
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67 while 1:
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68 s = fp.readline()
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69 if not s:
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70 break
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71 # If you get any output from this line,
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72 # it is probably caused by an unexpected input line:
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73 if matcher.search(s) < 0: s; continue # Shouldn't happen
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74 (ra, rb), (r1a, r1b), (r2a, r2b), (r3a, r3b) = matcher.regs[:4]
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75 fn, name, type = s[r1a:r1b], s[r3a:r3b], s[r2a:r2b]
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76 if type in definitions:
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77 store(def2file, name, fn)
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78 store(file2def, fn, name)
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79 elif type in externals:
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80 store(file2undef, fn, name)
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81 store(undef2file, name, fn)
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82 elif not type in ignore:
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83 print(fn + ':' + name + ': unknown type ' + type)
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84
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85 # Print all names that were undefined in some module and where they are
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86 # defined.
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87 #
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88 def printcallee():
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89 flist = sorted(file2undef.keys())
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90 for filename in flist:
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91 print(filename + ':')
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92 elist = file2undef[filename]
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93 elist.sort()
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94 for ext in elist:
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95 if len(ext) >= 8:
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96 tabs = '\t'
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97 else:
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98 tabs = '\t\t'
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99 if ext not in def2file:
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100 print('\t' + ext + tabs + ' *undefined')
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101 else:
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102 print('\t' + ext + tabs + flat(def2file[ext]))
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103
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104 # Print for each module the names of the other modules that use it.
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105 #
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106 def printcaller():
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107 files = sorted(file2def.keys())
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108 for filename in files:
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109 callers = []
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110 for label in file2def[filename]:
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111 if label in undef2file:
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112 callers = callers + undef2file[label]
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113 if callers:
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114 callers.sort()
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115 print(filename + ':')
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116 lastfn = ''
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117 for fn in callers:
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118 if fn != lastfn:
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119 print('\t' + fn)
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120 lastfn = fn
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121 else:
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122 print(filename + ': unused')
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123
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124 # Print undefined names and where they are used.
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125 #
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126 def printundef():
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127 undefs = {}
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128 for filename in list(file2undef.keys()):
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129 for ext in file2undef[filename]:
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130 if ext not in def2file:
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131 store(undefs, ext, filename)
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132 elist = sorted(undefs.keys())
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133 for ext in elist:
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134 print(ext + ':')
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135 flist = sorted(undefs[ext])
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136 for filename in flist:
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137 print('\t' + filename)
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138
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139 # Print warning messages about names defined in more than one file.
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140 #
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141 def warndups():
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142 savestdout = sys.stdout
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143 sys.stdout = sys.stderr
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144 names = sorted(def2file.keys())
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145 for name in names:
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146 if len(def2file[name]) > 1:
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147 print('warning:', name, 'multiply defined:', end=' ')
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148 print(flat(def2file[name]))
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149 sys.stdout = savestdout
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150
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151 # Main program
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152 #
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153 def main():
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154 try:
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155 optlist, args = getopt.getopt(sys.argv[1:], 'cdu')
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156 except getopt.error:
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157 sys.stdout = sys.stderr
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158 print('Usage:', os.path.basename(sys.argv[0]), end=' ')
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159 print('[-cdu] [file] ...')
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160 print('-c: print callers per objectfile')
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161 print('-d: print callees per objectfile')
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162 print('-u: print usage of undefined symbols')
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163 print('If none of -cdu is specified, all are assumed.')
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164 print('Use "nm -o" to generate the input (on IRIX: "nm -Bo"),')
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165 print('e.g.: nm -o /lib/libc.a | objgraph')
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166 return 1
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167 optu = optc = optd = 0
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168 for opt, void in optlist:
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169 if opt == '-u':
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170 optu = 1
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171 elif opt == '-c':
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172 optc = 1
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173 elif opt == '-d':
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174 optd = 1
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175 if optu == optc == optd == 0:
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176 optu = optc = optd = 1
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177 if not args:
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178 args = ['-']
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179 for filename in args:
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180 if filename == '-':
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181 readinput(sys.stdin)
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182 else:
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183 readinput(open(filename, 'r'))
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184 #
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185 warndups()
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186 #
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187 more = (optu + optc + optd > 1)
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188 if optd:
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189 if more:
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190 print('---------------All callees------------------')
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191 printcallee()
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192 if optu:
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193 if more:
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194 print('---------------Undefined callees------------')
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195 printundef()
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196 if optc:
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197 if more:
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198 print('---------------All Callers------------------')
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199 printcaller()
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200 return 0
274
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201
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202 # Call the main program.
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203 # Use its return value as exit status.
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204 # Catch interrupts to avoid stack trace.
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205 #
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206 if __name__ == '__main__':
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207 try:
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208 sys.exit(main())
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209 except KeyboardInterrupt:
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210 sys.exit(1)