38 lines
998 B
Ruby
38 lines
998 B
Ruby
module Vool
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class ReturnStatement < Statement
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include Normalizer
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attr_reader :return_value
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def initialize(value)
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@return_value = value
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end
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def normalize
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val , rest = *normalize_name(@return_value)
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me = ReturnStatement.new(val)
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return me unless rest
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rest << me
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rest
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end
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def each(&block)
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block.call(@return_value)
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end
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# Since the return is normalized to only allow simple values it is simple.
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# To return form a method in mom instructions we only need to do two things:
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# - store the given return value, this is a SlotMove
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# - activate return sequence (reinstantiate old message and jump to return address)
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def to_mom( compiler )
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ret = Mom::SlotLoad.new( [:message , :return_value] ,
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@return_value.slot_definition(compiler) )
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ret << Mom::ReturnSequence.new
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end
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def to_s(depth = 0)
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at_depth(depth , "return #{@return_value.to_s}")
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end
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end
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end
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