81 lines
1.7 KiB
Ruby
81 lines
1.7 KiB
Ruby
module Risc
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# A branch must branch to a label.
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# Different Branches (derived classes) use different registers, the base
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# just stores the Label
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class Branch < Instruction
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def initialize( source , label )
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super(source)
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@label = label
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end
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attr_reader :label
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def to_s
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"#{self.class.name.split("::").last}: #{label ? label.name : ''}"
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end
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alias :inspect :to_s
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def length( labels = [])
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ret = super(labels)
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ret += self.label.length(labels) if self.label
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ret
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end
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def to_arr( labels = [] )
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ret = super(labels)
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ret += self.label.to_arr(labels) if self.label
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ret
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end
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def total_byte_length labels = []
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ret = super(labels)
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ret += self.label.total_byte_length(labels) if self.label
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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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set_position self.label.set_position( position , labels ) if self.label
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super(position,labels)
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end
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def assemble_all( io , labels = [])
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self.assemble(io)
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self.label.assemble_all(io,labels) if self.label
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self.next.assemble_all(io, labels) if self.next
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end
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def each_label( labels =[] , &block)
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super
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self.label.each_label(labels , &block) if self.label
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end
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end
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# branch if two registers contain same value
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class IsSame < Branch
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attr_reader :left , :right
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def initialize(source , left , right , label)
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super(source , label)
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end
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end
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class Unconditional < Branch
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end
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class IsZero < Branch
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end
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class IsNotzero < Branch
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end
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class IsMinus < Branch
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end
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class IsPlus < Branch
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end
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end
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