Re: [PATCH 3/3] gdb/testsuite: Handle targets with lots of registers

[Pedro Alves <palves at redhat dot com>]

On 05/04/2018 01:01 PM, Andrew Burgess wrote:
> Thanks for the review feedback.
> 
> I've updated the patch below inline with Pedro's feedback, and
> included a header check as requested by Maciej.  I tested this on
> x86-64 and against RiscV which is the target that was originally
> causing me problems.

Thanks.

>  # Test for a regression where this command would internal-error if the
> -# program wasn't running.
> -gdb_test "maint print registers" "Name.*Nr.*Rel.*Offset.*Size.*Type.*"
> +# program wasn't running.  If there's a lot of registers then this
> +# might overflow expect's buffers, so process the output line at a
> +# time.
> +set saw_registers 0
> +set saw_headers 0
> +set test "maint print registers"
> +gdb_test_multiple $test $test {
> +    -re "\[^\r\n\]+Name\[^\r\n\]+Nr\[^\r\n\]+Rel\[^\r\n\]+Offset\[^\r\n\]+Size\[^\r\n\]+Type\[^\r\n\]+\[\r\n\]+" {
> +	set saw_headers 1
> +	exp_continue
> +    }
> +    -re "^\[^\r\n\]+\[0-9\]+\[^\r\n\]+\[0-9\]+\[^\r\n\]+\[0-9\]+\[^\r\n\]+\[0-9\]+\[^\r\n\]+\[\r\n\]+" {
> +        set saw_registers 1
> +        exp_continue
> +    }
> +    -re "^\\*\[0-9\]+\[^\r\n\]+\[\r\n\]+" {
> +        exp_continue
> +    }
> +    -re "$gdb_prompt $" {
> +        gdb_assert $saw_registers "$test: saw some registers"
> +        gdb_assert $saw_headers "$test: saw header line"

We try to avoid the potential for different FAIL / PASS
names/messages.  I.e., if the test times out, or gdb crashes,
you'll get "FAIL: $test" only , while if it reaches the prompt,
you'll get two tests recorded in gdb.sum.  The idea of matching
FAIL/PASS is to make it easier for scripts to distinguish
regressions/progressions vs new failures/passes.  (Text in
trailing ()s, like " (timeout)" is considered informational, and
can/should be stripped for test-matching purposes).  If you want to
record that the register and headers were seen, better put it in gdb.log,
with send_log or verbose -log, and do:

        gdb_assert {$saw_registers && $saw_headers} $test

OK with that change.

Thanks,
Pedro Alves