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_PyObject_GetDictPtr(): when the offset is negative, always align --

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we can't trust that tp_basicsize is aligned.  Fixes SF bug #462848.
This commit is contained in:
Guido van Rossum 2001-09-20 13:38:22 +00:00
parent aefd766eed
commit dd4d1c4f5d
1 changed files with 6 additions and 11 deletions
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17
Objects/object.c
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@ -1150,18 +1150,13 @@ _PyObject_GetDictPtr(PyObject *obj)
return NULL; return NULL;
if (dictoffset < 0) { if (dictoffset < 0) {
dictoffset += tp->tp_basicsize; dictoffset += tp->tp_basicsize;
dictoffset += tp->tp_itemsize * ((PyVarObject *)obj)->ob_size;
assert(dictoffset > 0); /* Sanity check */ assert(dictoffset > 0); /* Sanity check */
if (tp->tp_itemsize > 0) { /* Round up, if necessary */
int n = ((PyVarObject *)obj)->ob_size; if (dictoffset % PTRSIZE != 0) {
if (n > 0) { dictoffset /= PTRSIZE;
dictoffset += tp->tp_itemsize * n; dictoffset += 1;
/* Round up, if necessary */ dictoffset *= PTRSIZE;
if (tp->tp_itemsize % PTRSIZE != 0) {
dictoffset += PTRSIZE - 1;
dictoffset /= PTRSIZE;
dictoffset *= PTRSIZE;
}
}
} }
} }
return (PyObject **) ((char *)obj + dictoffset); return (PyObject **) ((char *)obj + dictoffset);