Re: [PATCH] analyzer: implement reference count checking for CPython plugin [PR107646]

[David Malcolm <dmalcolm@redhat.com>]

On Fri, 2023-09-01 at 04:49 +0200, Hans-Peter Nilsson wrote:
> (Looks like this was committed as r14-3580-g597b9ec69bca8a)
> 
> > Cc: gcc@gcc.gnu.org, gcc-patches@gcc.gnu.org, Eric Feng
> > <ef2648@columbia.edu>
> > From: Eric Feng via Gcc <gcc@gcc.gnu.org>
> 
> > gcc/testsuite/ChangeLog:
> >   PR analyzer/107646
> >         * gcc.dg/plugin/analyzer_cpython_plugin.c: Implements
> > reference count
> >   * checking for PyObjects.
> >         * gcc.dg/plugin/cpython-plugin-test-2.c: Moved to...
> >         * gcc.dg/plugin/cpython-plugin-test-PyList_Append.c:
> > ...here (and
> >   * added more tests).
> >         * gcc.dg/plugin/cpython-plugin-test-1.c: Moved to...
> >         * gcc.dg/plugin/cpython-plugin-test-no-plugin.c: ...here
> > (and added
> >   * more tests).
> >         * gcc.dg/plugin/plugin.exp: New tests.
> >         * gcc.dg/plugin/cpython-plugin-test-PyList_New.c: New test.
> >         * gcc.dg/plugin/cpython-plugin-test-PyLong_FromLong.c: New
> > test.
> >         * gcc.dg/plugin/cpython-plugin-test-refcnt-checking.c: New
> > test.
> 
> It seems this was more or less a rewrite, but that said,
> it's generally preferable to always *add* tests, never *modify* them.
> 
> >  .../gcc.dg/plugin/analyzer_cpython_plugin.c   | 376
> > +++++++++++++++++-
> 
> ^^^ Ouch!  Was it not within reason to keep that test as it
> was, and just add another test?
> 
> Anyway, the test after rewrite fails, and for some targets
> like cris-elf and apparently m68k-linux, yields an error.
> I see a PR was already opened.
> 
> Also, mostly for future reference, several files in the
> patch miss a final newline, as seen by a "\ No newline at
> end of file"-marker.
> 
> I think I found the problem; a mismatch between default C++
> language standard between host-gcc and target-gcc.
> 
> (It's actually *not* as simple as "auto var = typeofvar<bar>()"
> not being recognized in C++11 --or else there'd be an error
> for the hash_set declaration too, which I just changed for
> consistency-- but it's close enough for me.)
> 
> With this, retesting plugin.exp for cris-elf works.
> 
> Ok to commit?

Sorry about the failing tests.

Thanks for the patch; please go ahead and commit.

Dave

> 
> -- >8 --
> From: Hans-Peter Nilsson <hp@axis.com>
> Date: Fri, 1 Sep 2023 04:36:03 +0200
> Subject: [PATCH] testsuite: Fix analyzer_cpython_plugin.c
> declarations, PR testsuite/111264
> 
> Also, add missing newline at end of file.
> 
>         PR testsuite/111264
>         * gcc.dg/plugin/analyzer_cpython_plugin.c: Make declarations
>         C++11-compatible.
> ---
>  gcc/testsuite/gcc.dg/plugin/analyzer_cpython_plugin.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/gcc/testsuite/gcc.dg/plugin/analyzer_cpython_plugin.c
> b/gcc/testsuite/gcc.dg/plugin/analyzer_cpython_plugin.c
> index 7af520436549..bf1982e79c37 100644
> --- a/gcc/testsuite/gcc.dg/plugin/analyzer_cpython_plugin.c
> +++ b/gcc/testsuite/gcc.dg/plugin/analyzer_cpython_plugin.c
> @@ -477,8 +477,8 @@ pyobj_refcnt_checker (const region_model *model,
>    if (!ctxt)
>      return;
>  
> -  auto region_to_refcnt = hash_map<const region *, int> ();
> -  auto seen_regions = hash_set<const region *> ();
> +  hash_map<const region *, int> region_to_refcnt;
> +  hash_set<const region *> seen_regions;
>  
>    count_pyobj_references (model, region_to_refcnt, retval,
> seen_regions);
>    check_refcnts (model, old_model, retval, ctxt, region_to_refcnt);
> @@ -561,7 +561,7 @@ public:
>      if (!ctxt)
>        return;
>      region_model *model = cd.get_model ();
> -    auto region_to_refcnt = hash_map<const region *, int> ();
> +    hash_map<const region *, int> region_to_refcnt;
>      count_all_references(model, region_to_refcnt);
>      dump_refcnt_info(region_to_refcnt, model, ctxt);
>    }
> @@ -1330,4 +1330,4 @@ plugin_init (struct plugin_name_args
> *plugin_info,
>    sorry_no_analyzer ();
>  #endif
>    return 0;
> -}
> \ No newline at end of file
> +}