Charles Machalow added the comment:
Some more debug with print statements in the c code seems to confirm my
suspicion:
bitsize, pfield_size, bitofs, dict->size prints were added just above the if
chain to determine fieldtype and fieldtype was just after that if chain. That
code looks something like this:
printf("bitsize: %d\n" , (int)bitsize);
printf("pfield_size: %u\n", (size_t)*pfield_size);
printf("bitofs: %d\n", (int)*pbitofs);
printf("dict->size: %d\n", (int)dict->size);
if (bitsize /* this is a bitfield request */
&& *pfield_size /* we have a bitfield open */
#ifdef MS_WIN32
/* MSVC, GCC with -mms-bitfields */
&& dict->size * 8 == *pfield_size
#else
/* GCC */
&& dict->size * 8 <= *pfield_size
#endif
&& (*pbitofs + bitsize) <= *pfield_size) {
/* continue bit field */
fieldtype = CONT_BITFIELD;
#ifndef MS_WIN32
} else if (bitsize /* this is a bitfield request */
&& *pfield_size /* we have a bitfield open */
&& dict->size * 8 >= *pfield_size
&& (*pbitofs + bitsize) <= dict->size * 8) {
/* expand bit field */
fieldtype = EXPAND_BITFIELD;
#endif
} else if (bitsize) {
/* start new bitfield */
fieldtype = NEW_BITFIELD;
*pbitofs = 0;
*pfield_size = dict->size * 8;
} else {
/* not a bit field */
fieldtype = NO_BITFIELD;
*pbitofs = 0;
*pfield_size = 0;
}
printf("Fieldtype: %d\n------\n", fieldtype);
And the run with the custom-built Python 2.7.13:
>>> from test import *
bitsize: 0
pfield_size: 0
bitofs: 255918304
dict->size: 2
Fieldtype: 0
------
bitsize: 9
pfield_size: 0
bitofs: 0
dict->size: 2
Fieldtype: 1
------
bitsize: 1
pfield_size: 16
bitofs: 9
dict->size: 2
Fieldtype: 2
------
bitsize: 1
pfield_size: 16
bitofs: 10
dict->size: 2
Fieldtype: 2
------
bitsize: 1
pfield_size: 16
bitofs: 11
dict->size: 2
Fieldtype: 2
------
bitsize: 1
pfield_size: 16
bitofs: 12
dict->size: 2
Fieldtype: 2
------
bitsize: 3
pfield_size: 16
bitofs: 13
dict->size: 2
Fieldtype: 2
------
bitsize: 10
pfield_size: 16
bitofs: 16
dict->size: 4
Fieldtype: 3
------
bitsize: 20
pfield_size: 32
bitofs: 26
dict->size: 4
Fieldtype: 1
------
bitsize: 2
pfield_size: 32
bitofs: 20
dict->size: 4
Fieldtype: 2
------
10
>>> MyStructure.P
<Field type=c_ushort, ofs=0, size=2>
>>> MyStructure.T
<Field type=c_uint, ofs=2:16, bits=10>
>>> MyStructure.R
<Field type=c_ushort, ofs=2:13, bits=3>
>>> MyStructure.P
<Field type=c_ushort, ofs=0, size=2>
>>> MyStructure.L
<Field type=c_ushort, ofs=2:0, bits=9>
>>> MyStructure.Pro
<Field type=c_ushort, ofs=2:9, bits=1>
>>> MyStructure.R
<Field type=c_ushort, ofs=2:13, bits=3>
>>> MyStructure.T
<Field type=c_uint, ofs=2:16, bits=10>
>>> MyStructure.C
<Field type=c_uint, ofs=6:0, bits=20>
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29753>
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