56 lines
1.3 KiB
Ruby
56 lines
1.3 KiB
Ruby
module Virtual
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class Constant < ::Virtual::Object
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end
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# another abstract "marker" class (so we can check for it)
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# derived classes are Boot/Meta Class and StringConstant
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class ObjectConstant < Constant
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end
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class IntegerConstant < Constant
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def initialize int
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@integer = int
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end
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attr_reader :integer
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def attributes
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[:integer]
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end
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def inspect
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self.class.name + ".new(#{@integer})"
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end
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end
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# The name really says it all.
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# The only interesting thing is storage.
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# Currently string are stored "inline" , ie in the code segment.
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# Mainly because that works an i aint no elf expert.
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class StringConstant < ObjectConstant
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attr_reader :string
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# currently aligned to 4 (ie padded with 0) and off course 0 at the end
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def initialize str
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str = str.to_s if str.is_a? Symbol
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length = str.length
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# rounding up to the next 4 (always adding one for zero pad)
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pad = ((length / 4 ) + 1 ) * 4 - length
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raise "#{pad} #{self}" unless pad >= 1
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@string = str + " " * pad
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end
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def result= value
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class_for(MoveInstruction).new(value , self , :opcode => :mov)
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end
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# the strings length plus padding
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def length
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string.length
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end
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# just writing the string
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def assemble(io)
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io << string
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end
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end
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end |