[RFA]infcmd.c: add checks to 'info float'&'info vector'

[Elena Zannoni]

Elena Zannoni writes:
 > 
 > 'info registers' double checks that asking for registers from the
 > inferior is a meaningful operation at the time at which it is invoked.
 > I added similar checks for 'info float' and 'info vector'.
 > 
 > 
 > With this, I can get rid of more duplicate code in rs6000-tdep.c, used
 > to print the altivec registers.
 > 

I am going to check this in, I think it's pretty obvious.

Elena


 > Elena
 > 2002-08-18  Elena Zannoni  <ezannoni@redhat.com>
 > 
 > 	* infcmd.c (print_vector_info): Check that printing registers
 > 	makes sense.
 > 	(print_float_info): Ditto.
 > 
 > Index: infcmd.c
 > ===================================================================
 > RCS file: /cvs/uberbaum/gdb/infcmd.c,v
 > retrieving revision 1.52
 > diff -u -p -r1.52 infcmd.c
 > --- infcmd.c    16 Aug 2002 00:27:45 -0000      1.52
 > +++ infcmd.c    19 Aug 2002 03:29:26 -0000
 > @@ -1721,6 +1725,12 @@ print_vector_info (struct gdbarch *gdbar
 >      {
 >        int regnum;
 >        int printed_something = 0;
 > +
 > +      if (!target_has_registers)
 > +       error ("The program has no registers now.");
 > +      if (selected_frame == NULL)
 > +       error ("No selected frame.");
 > +
 >        for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
 >         {
 >           if (TYPE_VECTOR (REGISTER_VIRTUAL_TYPE (regnum)))
 > @@ -1899,6 +1909,12 @@ print_float_info (struct gdbarch *gdbarc
 >  #else
 >        int regnum;
 >        int printed_something = 0;
 > +
 > +      if (!target_has_registers)
 > +       error ("The program has no registers now.");
 > +      if (selected_frame == NULL)
 > +       error ("No selected frame.");
 > +
 >        for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
 >         {
 >           if (TYPE_CODE (REGISTER_VIRTUAL_TYPE (regnum)) == TYPE_CODE_FLT)