86 lines
1.8 KiB
Ruby
86 lines
1.8 KiB
Ruby
module Risc
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# A label is a placeholder for it's next Instruction
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# It's function is not to turn into code, but to be a valid brnch target
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#
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# So branches and Labels are pairs, fan out, fan in
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#
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#
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class Label < Instruction
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def initialize( source , name , nekst = nil)
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super(source , nekst)
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@name = name
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end
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attr_reader :name
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def to_s
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"Label: #{@name} (#{self.next.class.name.split("::").last})"
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end
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def sof_reference_name
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@name
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end
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# a method start has a label of the form Class.method , test for that
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def is_method
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@name.split(".").length == 2
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end
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def to_arr labels = []
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return [] if labels.include?(self)
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labels << self
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super
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end
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def length labels = []
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return 0 if labels.include?(self)
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labels << self
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ret = 1
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ret += self.next.length(labels) if self.next
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ret
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end
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def assemble io
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end
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def assemble_all io , labels = []
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return if labels.include?(self)
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labels << self
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self.next.assemble_all(io,labels)
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end
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def total_byte_length labels = []
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return 0 if labels.include?(self)
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labels << self
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ret = self.next.total_byte_length(labels)
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#puts "#{self.class.name} return #{ret}"
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ret
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end
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# labels have the same position as their next
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def set_position position , labels = []
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return position if labels.include?(self)
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labels << self
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super(position , labels)
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self.next.set_position(position,labels)
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end
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# shame we need this, just for logging
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def byte_length
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0
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end
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def each_label labels =[] , &block
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return if labels.include?(self)
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labels << self
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block.yield(self)
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super
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end
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end
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def self.label( source , name , nekst = nil)
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Label.new( source , name , nekst = nil)
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end
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end
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