Re: [PATCH 1/5] Add counter-cases for trace-condition.exp tests

[Pedro Alves <palves@redhat.com>]

On 05/27/2016 08:05 PM, Antoine Tremblay wrote:
> In trace-condition.exp, tests are done by doing a conditional tracepoint
> and validating that the trace contains all the frames that could be
> collected if that condition is true.
> 
> E.g. test_tracepoints $trace_command "21 + 21 == 42" 10
> 
> This will always return true and collect the 10 frames possible to collect
> with the test program.
> 
> However, if the condition evaluation is broken such that the condition is
> unconditional we will not notice this problem.
> 
> This patch adds counter-cases to such conditions like so:
> 
> $trace_command "21 + 11 == 42" 0
> 
> This way such a problem would be noticed.

Thanks for doing this.

> 
> gdb/testsuite/ChangeLog:
> 
> 	* gdb.trace/trace-condition.exp: Add counter-case tests.
> ---
>  gdb/testsuite/gdb.trace/trace-condition.exp | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/gdb/testsuite/gdb.trace/trace-condition.exp b/gdb/testsuite/gdb.trace/trace-condition.exp
> index b7427ca..f9eaf31 100644
> --- a/gdb/testsuite/gdb.trace/trace-condition.exp
> +++ b/gdb/testsuite/gdb.trace/trace-condition.exp
> @@ -157,4 +157,25 @@ foreach trace_command { "trace" "ftrace" } {
>      test_tracepoints $trace_command "(42 >= 42 ? 0 : 1) == 0" 10
>      test_tracepoints $trace_command "(42 > 21 ? 0 : 1) == 0" 10 18955_i386_failure
>      test_tracepoints $trace_command "\$trace_timestamp >= 0" 10
> +
> +    # Counter-cases tests.
> +    test_tracepoints $trace_command "21 + 21 == 11" 0
> +    test_tracepoints $trace_command "42 - 21 == 11" 0
> +    test_tracepoints $trace_command "21 * 2 == 11" 0
> +    test_tracepoints $trace_command "21 << 1 == 11" 0
> +    test_tracepoints $trace_command "42 >> 1 == 11" 0
> +    test_tracepoints $trace_command "-(21 << 1) == -11" 0
> +    test_tracepoints $trace_command "-42 >> 1 == -11" 0
> +    test_tracepoints $trace_command "(0xabababab & 0x0000ffff) == 0xffff" 0
> +    test_tracepoints $trace_command "(0xabababab | 0x0000ffff) == 0xeeeedddd" 0
> +    test_tracepoints $trace_command "(0xaaaaaaaa ^ 0x55555555) == 0xaaaaaaaa" 0
> +    test_tracepoints $trace_command "~0xaaaaaaaa == 0x11111111" 0
> +    test_tracepoints $trace_command "61 < 42" 0
> +    test_tracepoints $trace_command "42 <= 11" 0
> +    test_tracepoints $trace_command "11 >= 42" 0
> +    test_tracepoints $trace_command "11 > 21" 0
> +    test_tracepoints $trace_command "(66 < 42 ? 0 : 1) == 0" 0 18955_i386_failure
> +    test_tracepoints $trace_command "(66 <= 42 ? 0 : 1) == 0" 0
> +    test_tracepoints $trace_command "(11 >= 42 ? 0 : 1) == 0" 0
> +    test_tracepoints $trace_command "(11 > 21 ? 0 : 1) == 0" 0 18955_i386_failure

I'm surprised to see these split into their own section though.
I'd think it'd be better to keep each along side the corresponding test,
to make it easier to keep them in sync:

     test_tracepoints $trace_command "21 + 21 == 42" 10
+    test_tracepoints $trace_command "21 + 21 == 11" 0
     test_tracepoints $trace_command "42 - 21 == 21" 10
+    test_tracepoints $trace_command "42 - 21 == 11" 0

etc.

Could you do that?

>  }
> 

Thanks,
Pedro Alves