64 lines
1.3 KiB
Ruby
64 lines
1.3 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_cpu(translator)
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@cpu_label ||= super
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end
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def to_s
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class_source "#{@name} (next: #{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 assemble_all( io )
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self.each {|ins| ins.assemble(io)}
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end
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def assemble io
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end
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def total_byte_length
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ret = 0
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self.each{|ins| ret += ins.byte_length}
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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 , count = 0 , extra = nil)
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Position.set(self,position , extra)
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self.next.set_position(position,count,extra) if self.next
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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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alias :padded_length :byte_length
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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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