[PATCH] Extend handling of immediates on ARM's SystemTap SDT probe support

[Sergio Durigan Junior]

On Saturday, December 28 2013, Joel Brobecker wrote:

>> diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
>> index 0284f69..df2b8c4 100644
>> --- a/gdb/arm-linux-tdep.c
>> +++ b/gdb/arm-linux-tdep.c
>> @@ -1116,7 +1116,7 @@ arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
>>  static int
>>  arm_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
>>  {
>> -  return (*s == '#' /* Literal number.  */
>> +  return (*s == '#' || *s == '$' || isdigit (*s) /* Literal number.  */
>>  	  || *s == '[' /* Register indirection or
>>  			  displacement.  */
>>  	  || isalpha (*s)); /* Register value.  */
>> @@ -1183,14 +1183,19 @@ arm_stap_parse_special_token (struct gdbarch *gdbarch,
>>  
>>        ++tmp;
>>        tmp = skip_spaces_const (tmp);
>> -      if (*tmp++ != '#')
>> -	return 0;
>> +      if (*tmp == '#' || *tmp == '$')
>> +	++tmp;
>>  
>>        if (*tmp == '-')
>>  	{
>>  	  ++tmp;
>>  	  got_minus = 1;
>>  	}
>> +      else if (*tmp == '+')
>> +	++tmp;
>> +
>> +      if (!isdigit (*tmp))
>> +	return 0;
>>  
>
> I think you mixed in one change which is unrelated to this patch
> (the handling of the '+' sign).  Perhaps you had meant to have it
> as part of the first patch?
>
>     [PATCH v2] Fix for PR tdep/15653: Implement SystemTap SDT probe
>     support for AArch64
>     http://www.sourceware.org/ml/gdb-patches/2013-12/msg00887.html
>
> IIRC, this patch was born by extraction out of v1 of the patch above.
>
> If I am correct, this patch is pre-approved with the '+' bit moved to
> the correct patch.

You are indeed correct that this change doesn't belong to this patch,
but it also doesn't belong to the AArch64 patch (that's why I didn't
include it there).  I will actually post a separate patch for this
change.  In fact, there are some other places that could use this
improvement too, so this new patch will include those as well.

Having said that, I removed this piece from the patch and committed the
rest.  Thank you a lot for the review!

    <https://sourceware.org/ml/gdb-cvs/2013-12/msg00124.html>

-- 
Sergio