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dis(): Added an optional memo argument, so that multiple pickles in a

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file can be dumped without (bogus) complaint if the the pickles were
created using a single pickle memo.
This commit is contained in:
Tim Peters 2003-02-05 19:55:53 +00:00
parent 18e7083cda
commit 62235e701e
1 changed files with 38 additions and 2 deletions
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40
Lib/pickletools.py
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@ -1861,7 +1861,7 @@ def genops(pickle):
############################################################################## ##############################################################################
# A symbolic pickle disassembler. # A symbolic pickle disassembler.
def dis(pickle, out=None, indentlevel=4): def dis(pickle, out=None, memo=None, indentlevel=4):
"""Produce a symbolic disassembly of a pickle. """Produce a symbolic disassembly of a pickle.
'pickle' is a file-like object, or string, containing a (at least one) 'pickle' is a file-like object, or string, containing a (at least one)
@ -1871,6 +1871,12 @@ def dis(pickle, out=None, indentlevel=4):
Optional arg 'out' is a file-like object to which the disassembly is Optional arg 'out' is a file-like object to which the disassembly is
printed. It defaults to sys.stdout. printed. It defaults to sys.stdout.
Optional arg 'memo' is a Python dict, used as the pickle's memo. It
may be mutated by dis(), if the pickle contains PUT or BINPUT opcodes.
Passing the same memo object to another dis() call then allows disassembly
to proceed across multiple pickles that were all created by the same
pickler with the same memo. Ordinarily you don't need to worry about this.
Optional arg indentlevel is the number of blanks by which to indent Optional arg indentlevel is the number of blanks by which to indent
a new MARK level. It defaults to 4. a new MARK level. It defaults to 4.
@ -1895,7 +1901,8 @@ def dis(pickle, out=None, indentlevel=4):
# (which in turn is needed to indent MARK blocks correctly). # (which in turn is needed to indent MARK blocks correctly).
stack = [] # crude emulation of unpickler stack stack = [] # crude emulation of unpickler stack
memo = {} # crude emulation of unpicker memo if memo is None:
memo = {} # crude emulation of unpicker memo
maxproto = -1 # max protocol number seen maxproto = -1 # max protocol number seen
markstack = [] # bytecode positions of MARK opcodes markstack = [] # bytecode positions of MARK opcodes
indentchunk = ' ' * indentlevel indentchunk = ' ' * indentlevel
@ -2195,7 +2202,36 @@ highest protocol among opcodes = 2
highest protocol among opcodes = 2 highest protocol among opcodes = 2
""" """
_memo_test = r"""
>>> import pickle
>>> from StringIO import StringIO
>>> f = StringIO()
>>> p = pickle.Pickler(f, 2)
>>> x = [1, 2, 3]
>>> p.dump(x)
>>> p.dump(x)
>>> f.seek(0)
>>> memo = {}
>>> dis(f, memo=memo)
0: \x80 PROTO 2
2: ] EMPTY_LIST
3: q BINPUT 0
5: ( MARK
6: K BININT1 1
8: K BININT1 2
10: K BININT1 3
12: e APPENDS (MARK at 5)
13: . STOP
highest protocol among opcodes = 2
>>> dis(f, memo=memo)
14: \x80 PROTO 2
16: h BINGET 0
18: . STOP
highest protocol among opcodes = 2
"""
__test__ = {'disassembler_test': _dis_test, __test__ = {'disassembler_test': _dis_test,
'disassembler_memo_test': _memo_test,
} }
def _test(): def _test():