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Issue #19800: make the pickle framing tests more precise.

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Antoine Pitrou 2013-12-03 09:51:40 +01:00
parent 069a5e1057
commit 6e8bc50317
1 changed files with 22 additions and 0 deletions
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22
Lib/test/pickletester.py
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@ -1416,6 +1416,26 @@ class AbstractPickleTests(unittest.TestCase):
FRAME_SIZE_TARGET = 64 * 1024
def check_frame_opcodes(self, pickled):
"""
Check the arguments of FRAME opcodes in a protocol 4+ pickle.
"""
frame_opcode_size = 9
last_arg = last_pos = None
for op, arg, pos in pickletools.genops(pickled):
if op.name != 'FRAME':
continue
if last_pos is not None:
# The previous frame's size should be equal to the number
# of bytes up to the current frame.
frame_size = pos - last_pos - frame_opcode_size
self.assertEqual(frame_size, last_arg)
last_arg, last_pos = arg, pos
# The last frame's size should be equal to the number of bytes up
# to the pickle's end.
frame_size = len(pickled) - last_pos - frame_opcode_size
self.assertEqual(frame_size, last_arg)
def test_framing_many_objects(self):
obj = list(range(10**5))
for proto in range(4, pickle.HIGHEST_PROTOCOL + 1):
@ -1429,6 +1449,7 @@ class AbstractPickleTests(unittest.TestCase):
self.FRAME_SIZE_TARGET / 2)
self.assertLessEqual(bytes_per_frame,
self.FRAME_SIZE_TARGET * 1)
self.check_frame_opcodes(pickled)
def test_framing_large_objects(self):
N = 1024 * 1024
@ -1440,6 +1461,7 @@ class AbstractPickleTests(unittest.TestCase):
self.assertEqual(obj, unpickled)
n_frames = count_opcode(pickle.FRAME, pickled)
self.assertGreaterEqual(n_frames, len(obj))
self.check_frame_opcodes(pickled)
def test_optional_frames(self):
if pickle.HIGHEST_PROTOCOL < 4: