2004-01-27  Jim Blandy  <jimb@redhat.com>

	* findvar.c (value_from_register): If the type has no length, just
	return an acceptable value --- don't report an internal error.

Index: gdb/findvar.c
===================================================================
RCS file: /cvs/src/src/gdb/findvar.c,v
retrieving revision 1.68
diff -c -r1.68 findvar.c
*** gdb/findvar.c	26 Jan 2004 20:36:32 -0000	1.68
--- gdb/findvar.c	28 Jan 2004 05:47:05 -0000
***************
*** 617,623 ****
    struct value *v = allocate_value (type);
    CHECK_TYPEDEF (type);
  
!   if (CONVERT_REGISTER_P (regnum, type))
      {
        /* The ISA/ABI need to something weird when obtaining the
           specified value from this register.  It might need to
--- 617,646 ----
    struct value *v = allocate_value (type);
    CHECK_TYPEDEF (type);
  
!   if (TYPE_LENGTH (type) == 0)
!     {
!       /* It doesn't matter much what we return for this: since the
!          length is zero, it could be anything.  But if allowed to see
!          a zero-length type, the register-finding loop below will set
!          neither mem_stor nor reg_stor, and then report an internal
!          error.  
! 
!          Zero-length types can legitimately arise from declarations
!          like 'struct {}'.  GDB may also create them when it finds
!          bogus debugging information; for example, in GCC 2.94.4 and
!          binutils 2.11.93.0.2, the STABS BINCL->EXCL compression
!          process can create bad type numbers.  GDB reads these as
!          TYPE_CODE_UNDEF types, with zero length.  (That bug is
!          actually the only known way to get a zero-length value
!          allocated to a register --- which is what it takes to make it
!          here.)
! 
!          We'll just attribute the value to the original register.  */
!       VALUE_LVAL (v) = lval_register;
!       VALUE_ADDRESS (v) = regnum;
!       VALUE_REGNO (v) = regnum;
!     }
!   else if (CONVERT_REGISTER_P (regnum, type))
      {
        /* The ISA/ABI need to something weird when obtaining the
           specified value from this register.  It might need to