Re: [TCLCORE] Purify Errors/Crash Because of Tcl_InvalidateStringRep

[Donald G P. <dg...@ni...>]

> From: "Dinesh Monga" <din...@xi...>
> My Questions Are:
> Is it valid to call Tcl_InvalidateStringRep in the client side code?
> Does Tcl holds on to this string representation and expects that we
> never release this memory?
> If it is valid to call this method, what should be correct place to do
> so?

Your code should call Tcl_InvalidateStringRep(objPtr) only when it
is changing the internal rep of objPtr to a new value that is
inconsistent with the current string representation of objPtr.

Such operations on the internal rep of a Tcl_Obj ought to be done
only by the code that implements the Tcl_ObjType of that objPtr,
or by closely releated routines in the spirit of Tcl_GetFooFromObj().

If you are using T_ISR for any other purpose, you are mis-using it.

Whenever you're messing around with Tcl_Obj internals, also be sure
you're properly managing reference counts with Tcl_(Incr|Decr)RefCount()
calls, and take care to respect Tcl's Copy on Write rules for Tcl_Obj
sharing.

| Don Porter          Mathematical and Computational Sciences Division |
| don...@ni...             Information Technology Laboratory |
| http://math.nist.gov/~DPorter/                                  NIST |
|______________________________________________________________________|