[RFA] Allow Windows UNWIND_INFO version 2.

[Tristan Gingold]

On 03 Dec 2013, at 19:47, Pedro Alves <palves@redhat.com> wrote:

> On 12/03/2013 11:32 AM, Joel Brobecker wrote:
>> @@ -696,7 +697,17 @@ amd64_windows_frame_decode_insns (struct frame_info *this_frame,
>> 	return;
>> 
>>       end_insns = &insns[codes_count * 2];
>> -      for (p = insns; p < end_insns; p += 2)
>> +      p = insns;
>> +
>> +      /* Skip opcodes 6 of version 2.  This opcode is not documented.  */
>> +      if (PEX64_UWI_VERSION (ex_ui.Version_Flags) == 2)
>> +	{
>> +	  for (; p < end_insns; p += 2)
>> +	    if (PEX64_UNWCODE_CODE (p[1]) != 6)
>> +	      break;
>> +	}
> 
> I'd consider merging with the existing loop, so that
> we print the opcodes when frame debug is enabled.

Not sure this is a good idea.  You can use objdump -p if you want to view the opcodes.

But this opcode was also used in version 1, and in version 2 appears only before all other
opcodes.

Tristan.