petdance/scratch — Issue #116: Free()ing of SymReg variables
Author: petdance
Created: 2011-11-14 05:54:59+00:00
State: open
Labels: bug, core, Pri-normal, Sev-medium

From the [http://rt.perl.org/rt3/Ticket/Display.html?id=44993 Original RT]
On Mon, Aug 27, 2007 at 09:00:42AM -0700, Paul Cochrane wrote:

{{{
> In looking through some of the warnings that Coverity Prevent has
> thrown up one common thing has come up which I'd like some advice
> about. We are getting "leaked storage" errors often associated with
> variables declared as SymReg[1]. For example, in
> compilers/imcc/pbc.c, at line 1463, the variable 'r' is assigned and
> then goes out of scope a few lines afterwards. This Coverity picks up
> as being leaked storage. However, if I put C at the
> end of the relevant block, C fails. There are other
> instances as well compilers/imcc/imcparser.c:2964 (i.e.
> compilers/imcc/imcc.y:598) and compilers/imcc/imcparser.c:675,
> compilers/imcc/imcparser.c659 (this time with the variable 'r3').

There are definitely some memory leaks here. I've seen these in Valgrind reports for a while. My best explanation is that we stick these new pointers in memory somewhere, but don't free them appropriately.

I haven't been able to perform sufficient lifetime analysis to track down where they go and where to free them, yet. Patches welcome.

-- c
}}}

As a first step, it would be nice if someone with access to the Coverity reports could verify if this was still being reported as an issue.

Originally http://trac.parrot.org/parrot/ticket/1031