41 lines
1.1 KiB
Ruby
41 lines
1.1 KiB
Ruby
module Risc
|
|
|
|
# Transfer the constents of one register to another.
|
|
# possibly called move in some cpus
|
|
|
|
# There are other instructions to move data from / to memory, namely SlotToReg and RegToSlot
|
|
|
|
# Get/Set Slot move data around in vm objects, but transfer moves the objects (in the machine)
|
|
#
|
|
# Also it is used for moving temorary data
|
|
#
|
|
|
|
class Transfer < Instruction
|
|
# initialize with from and to registers.
|
|
# First argument from
|
|
# second argument to
|
|
#
|
|
# Note: this may be reversed from some assembler notations (also arm)
|
|
def initialize( source , from , to )
|
|
super(source)
|
|
@from = from
|
|
@to = to
|
|
raise "Fix me #{from}" unless from.is_a? RegisterValue
|
|
raise "Fix me #{to}" unless to.is_a? RegisterValue
|
|
end
|
|
attr_reader :from, :to
|
|
|
|
# return an array of names of registers that is used by the instruction
|
|
def register_attributes
|
|
[:from , :to]
|
|
end
|
|
|
|
def to_s
|
|
class_source "#{from} -> #{to}"
|
|
end
|
|
end
|
|
def self.transfer( source , from , to)
|
|
Transfer.new( source , from , to)
|
|
end
|
|
end
|