Re: Question on ThrowErrorData

=?UTF-8?B?5q2j5Y2O5ZCV?= <kainwen@gmail.com> writes:
>      Inside errfinish, it just does a simple pointer assignment to set
>      filename and funcname field (via function set_stack_entry_location()).

Please note the comment on struct ErrorData:

 * ErrorData holds the data accumulated during any one ereport() cycle.
 * Any non-NULL pointers must point to palloc'd data.
 * (The const pointers are an exception; we assume they point at non-freeable
 * constant strings.)
...
    const char *filename;       /* __FILE__ of ereport() call */
...
    const char *funcname;       /* __func__ of ereport() call */

In practice these are always pointing at compiler-generated
constant strings.

            regards, tom lane