Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/combinerefs.py @ 84007:dbfbdf2b5c19 3.3

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Fix #17967: For ftp urls CWD to target instead of hopping to each directory towards target. This fixes a bug where target is accessible, but parent directories are restricted.
author Senthil Kumaran <senthil@uthcode.com>
date Sat, 01 Jun 2013 08:27:06 -0700
parents fcfe324663a6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
59522
fcfe324663a6 convert shebang lines: python -> python3
Benjamin Peterson <benjamin@python.org>
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1 #! /usr/bin/env python3
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2
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3 """
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4 combinerefs path
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5
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6 A helper for analyzing PYTHONDUMPREFS output.
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7
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8 When the PYTHONDUMPREFS envar is set in a debug build, at Python shutdown
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9 time Py_Finalize() prints the list of all live objects twice: first it
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10 prints the repr() of each object while the interpreter is still fully intact.
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11 After cleaning up everything it can, it prints all remaining live objects
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12 again, but the second time just prints their addresses, refcounts, and type
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13 names (because the interpreter has been torn down, calling repr methods at
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14 this point can get into infinite loops or blow up).
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15
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16 Save all this output into a file, then run this script passing the path to
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17 that file. The script finds both output chunks, combines them, then prints
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18 a line of output for each object still alive at the end:
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19
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20 address refcnt typename repr
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21
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22 address is the address of the object, in whatever format the platform C
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23 produces for a %p format code.
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24
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25 refcnt is of the form
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26
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27 "[" ref "]"
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28
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29 when the object's refcount is the same in both PYTHONDUMPREFS output blocks,
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30 or
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31
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32 "[" ref_before "->" ref_after "]"
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33
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34 if the refcount changed.
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35
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36 typename is object->ob_type->tp_name, extracted from the second PYTHONDUMPREFS
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37 output block.
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38
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39 repr is repr(object), extracted from the first PYTHONDUMPREFS output block.
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40 CAUTION: If object is a container type, it may not actually contain all the
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41 objects shown in the repr: the repr was captured from the first output block,
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42 and some of the containees may have been released since then. For example,
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43 it's common for the line showing the dict of interned strings to display
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44 strings that no longer exist at the end of Py_Finalize; this can be recognized
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45 (albeit painfully) because such containees don't have a line of their own.
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46
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47 The objects are listed in allocation order, with most-recently allocated
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48 printed first, and the first object allocated printed last.
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49
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50
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51 Simple examples:
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52
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53 00857060 [14] str '__len__'
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54
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55 The str object '__len__' is alive at shutdown time, and both PYTHONDUMPREFS
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56 output blocks said there were 14 references to it. This is probably due to
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57 C modules that intern the string "__len__" and keep a reference to it in a
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58 file static.
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59
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60 00857038 [46->5] tuple ()
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61
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62 46-5 = 41 references to the empty tuple were removed by the cleanup actions
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63 between the times PYTHONDUMPREFS produced output.
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64
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65 00858028 [1025->1456] str '<dummy key>'
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66
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67 The string '<dummy key>', which is used in dictobject.c to overwrite a real
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68 key that gets deleted, grew several hundred references during cleanup. It
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69 suggests that stuff did get removed from dicts by cleanup, but that the dicts
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70 themselves are staying alive for some reason. """
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71
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72 import re
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73 import sys
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74
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75 # Generate lines from fileiter. If whilematch is true, continue reading
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76 # while the regexp object pat matches line. If whilematch is false, lines
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77 # are read so long as pat doesn't match them. In any case, the first line
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78 # that doesn't match pat (when whilematch is true), or that does match pat
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79 # (when whilematch is false), is lost, and fileiter will resume at the line
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80 # following it.
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81 def read(fileiter, pat, whilematch):
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82 for line in fileiter:
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83 if bool(pat.match(line)) == whilematch:
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84 yield line
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85 else:
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86 break
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87
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88 def combine(fname):
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89 f = open(fname)
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90
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91 fi = iter(f)
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92
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93 for line in read(fi, re.compile(r'^Remaining objects:$'), False):
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94 pass
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95
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96 crack = re.compile(r'([a-zA-Z\d]+) \[(\d+)\] (.*)')
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97 addr2rc = {}
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98 addr2guts = {}
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99 before = 0
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100 for line in read(fi, re.compile(r'^Remaining object addresses:$'), False):
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101 m = crack.match(line)
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102 if m:
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103 addr, addr2rc[addr], addr2guts[addr] = m.groups()
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104 before += 1
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105 else:
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106 print('??? skipped:', line)
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107
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108 after = 0
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109 for line in read(fi, crack, True):
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110 after += 1
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111 m = crack.match(line)
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112 assert m
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113 addr, rc, guts = m.groups() # guts is type name here
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114 if addr not in addr2rc:
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115 print('??? new object created while tearing down:', line.rstrip())
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116 continue
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117 print(addr, end=' ')
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118 if rc == addr2rc[addr]:
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119 print('[%s]' % rc, end=' ')
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120 else:
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121 print('[%s->%s]' % (addr2rc[addr], rc), end=' ')
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122 print(guts, addr2guts[addr])
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123
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124 f.close()
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125 print("%d objects before, %d after" % (before, after))
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126
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127 if __name__ == '__main__':
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128 combine(sys.argv[1])