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Wrote down the invariants of some common objects whose structure is

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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.
This commit is contained in:
Armin Rigo 2004-10-28 16:32:00 +00:00
parent 063e1e846d
commit 89a39461bf
12 changed files with 98 additions and 25 deletions
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9
Include/stringobject.h
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@ -37,6 +37,15 @@ typedef struct {
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