rubyx/lib/register/instructions/branch.rb

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module Register
# a branch must branch to a block.
class Branch < Instruction
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def initialize source , to
super(source)
@label = to
end
attr_reader :label
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def to_s
"#{self.class.name}: #{label.name}"
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end
alias :inspect :to_s
def length labels = []
ret = super(labels)
ret += self.label.length(labels) if self.label
ret
end
def to_ac labels = []
ret = super(labels)
ret += self.label.to_ac(labels) if self.label
ret
end
def total_byte_length labels = []
ret = super(labels)
ret += self.label.total_byte_length(labels) if self.label
#puts "#{self.class.name} return #{ret}"
ret
end
# labels have the same position as their next
def set_position position , labels = []
position = self.label.set_position( position , labels ) if self.label
super(position,labels)
end
def assemble_all io , labels = []
self.assemble(io)
self.label.assemble_all(io,labels) if self.label
self.next.assemble_all(io, labels) if self.next
end
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def each_label labels =[] , &block
super
self.label.each_label(labels , &block) if self.label
end
end
class IsZero < Branch
end
class IsNotzero < Branch
end
class IsMinus < Branch
end
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class IsPlus < Branch
end
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end