[tree-ssa]: Fix for PTA broken by find_referenced_vars change.

[Daniel Berlin]

On Sunday, August 10, 2003, at 1:08 PM, Diego Novillo wrote:

> On Sat, 2003-08-09 at 19:40, Daniel Berlin wrote:
>> Diego, your change that moves find_referenced_vars causes us to query
>> points-to information before it's created.
>>
> Oops.
>
>> Would you like me to move the call to create_alias_vars to
>> the top of the find_referenced_vars function or before the call to
>> find_referenced_vars in tree-optimize.c?
>>
> The top of find_referenced_vars should be fine.  So, create_alias_vars
> can't use the variables found by find_referenced_vars?

It can.
It's just we need to *create* the info prior to find_referenced_vars is 
called.
What happens is this:

find_referenced_vars calls ends up calling add_referenced_var.
add_referenced_var  calls get_memory_tag_for
get_memory_tag_for calls ptr_may_alias_var
Since the info isn't created yet, ptr_may_alias_var aborts.
:)
Creating the info at the top of find_referenced_vars will solve the 
problem.

>
> Diego.
>