36 lines
1015 B
Ruby
36 lines
1015 B
Ruby
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module Vm
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# Word is an abstract base class for the obvious values, ie those that fit into a register
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# Marked as abstract by private constructor
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#
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# Integer and (Object) References are the main derived classes, but float will come and ...
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# The Mystery Value has unknown type and has only casting methods. So it must be cast to be useful.
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# Types are stored at runtime when needed in TYPE_REGISTER (r1 on arm), which is mostly before calls,
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# so that the called function can do casts / branching correctly
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class Word < Value
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attr_accessor :register
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def register_symbol
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@register.symbol
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end
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def inspect
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"#{self.class.name} (#{register_symbol})"
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end
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def to_s
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inspect
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end
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def length
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4
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end
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# aka to string
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def to_asm
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"#{register_symbol}"
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end
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private
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def initialize reg
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if reg.is_a? RegisterReference
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@register = reg
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else
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@register = RegisterReference.new(reg)
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end
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end
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end
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end
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