To help support special-purpose extensions to SUIF, we have provided a
generic class of instructions. This is implemented in the in_gen
class. These generic instructions contain arbitrarily large arrays of
source operands and a character string field to hold user-defined names
that function as "sub-opcodes". Generic instructions are not part of
standard SUIF and most SUIF passes will not handle them.
Because it is difficult to add new opcodes to SUIF at run-time, the
generic instructions all share the same gen opcode. Instead,
they are distinguished by user-defined names. The name and
set_name methods may be used to access these character string
fields. The set_name method automatically enters the name in the
lexicon (see section Lexicon).
A generic instruction contains a pointer to an array of source operands.
The base class num_srcs method may be used to determine the size
of this array. The size may be changed at any time using the
set_num_srcs method. If necessary, the array will be
reallocated. The elements of the source operand array can be accessed
using the standard base class src_op and set_src_op
methods. See section Source Operands.