Mercurial > cpython-lru_cache-weakref
diff Include/stringobject.h @ 33856:60c60dc75c77 legacy-trunk
Wrote down the invariants of some common objects whose structure is
exposed in header files. Fixed a few comments in these headers.
As we might have expected, writing down invariants systematically exposed a
(minor) bug. In this case, function objects have a writeable func_code
attribute, which could be set to code objects with the wrong number of
free variables. Calling the resulting function segfaulted the interpreter.
Added a corresponding test.
| author | Armin Rigo <arigo@tunes.org> |
|---|---|
| date | Thu, 28 Oct 2004 16:32:00 +0000 |
| parents | 85e52ec85629 |
| children | 7fdc639bc5b4 |
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--- a/Include/stringobject.h Thu Oct 28 13:04:26 2004 +0000 +++ b/Include/stringobject.h Thu Oct 28 16:32:00 2004 +0000 @@ -37,6 +37,15 @@ long ob_shash; int ob_sstate; char ob_sval[1]; + + /* Invariants: + * ob_sval contains space for 'ob_size+1' elements. + * ob_sval[ob_size] == 0. + * ob_shash is the hash of the string or -1 if not computed yet. + * ob_sstate != 0 iff the string object is in stringobject.c's + * 'interned' dictionary; in this case the two references + * from 'interned' to this object are *not counted* in ob_refcnt. + */ } PyStringObject; #define SSTATE_NOT_INTERNED 0