[wide-int 5/5] Add dump () method for gdb debugging

[Richard Sandiford]

Kenneth Zadeck <zadeck@naturalbridge.com> writes:
> don't you think that it would be easier to understand the number if you 
> printed it largest index first, as in the routines in wide-int-print.cc?

Yeah, that's what the patch does.  E.g. (for 32-bit HWI):

  [...,0x3,0x80000000]

is 7 << 31.

Thanks,
Richard

>
> kenny
> On 04/25/2014 09:58 AM, Richard Sandiford wrote:
>> This patch adds a dump () method so that it's easier to read the
>> contents of the various wide-int types in gdb.  I've deliberately not
>> done any extension for "small_prec" cases because I think here
>> we want to see the raw values as much as possible.
>>
>> Tested on x86_64-linux-gnu.  OK to install?
>>
>> Thanks,
>> Richard
>>
>>
>> Index: gcc/wide-int.cc
>> ===================================================================
>> --- gcc/wide-int.cc	2014-04-25 14:48:03.263213403 +0100
>> +++ gcc/wide-int.cc	2014-04-25 14:48:25.186333842 +0100
>> @@ -2130,3 +2130,9 @@ wi::only_sign_bit_p (const wide_int_ref
>>   void gt_ggc_mx (widest_int *) { }
>>   void gt_pch_nx (widest_int *, void (*) (void *, void *), void *) { }
>>   void gt_pch_nx (widest_int *) { }
>> +
>> +template void wide_int::dump () const;
>> +template void generic_wide_int <wide_int_ref_storage <false> >::dump () const;
>> +template void generic_wide_int <wide_int_ref_storage <true> >::dump () const;
>> +template void offset_int::dump () const;
>> +template void widest_int::dump () const;
>> Index: gcc/wide-int.h
>> ===================================================================
>> --- gcc/wide-int.h	2014-04-25 14:34:54.823652619 +0100
>> +++ gcc/wide-int.h	2014-04-25 14:48:06.218229309 +0100
>> @@ -709,6 +709,9 @@ #define INCDEC_OPERATOR(OP, DELTA) \
>>   #undef ASSIGNMENT_OPERATOR
>>   #undef INCDEC_OPERATOR
>>   
>> +  /* Debugging functions.  */
>> +  void dump () const;
>> +
>>     static const bool is_sign_extended
>>       = wi::int_traits <generic_wide_int <storage> >::is_sign_extended;
>>   };
>> @@ -859,6 +862,23 @@ generic_wide_int <storage>::operator = (
>>     return *this;
>>   }
>>   
>> +/* Dump the contents of the integer to stderr, for debugging.  */
>> +template <typename storage>
>> +void
>> +generic_wide_int <storage>::dump () const
>> +{
>> +  unsigned int len = this->get_len ();
>> +  const HOST_WIDE_INT *val = this->get_val ();
>> +  unsigned int precision = this->get_precision ();
>> +  fprintf (stderr, "[");
>> +  if (len * HOST_BITS_PER_WIDE_INT < precision)
>> +    fprintf (stderr, "...,");
>> +  for (unsigned int i = 0; i < len - 1; ++i)
>> +    fprintf (stderr, HOST_WIDE_INT_PRINT_HEX ",", val[len - 1 - i]);
>> +  fprintf (stderr, HOST_WIDE_INT_PRINT_HEX "], precision = %d\n",
>> +	   val[0], precision);
>> +}
>> +
>>   namespace wi
>>   {
>>     template <>