59 lines
1.3 KiB
Ruby
59 lines
1.3 KiB
Ruby
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module Intel
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##
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# Instruction is an instruction shape that we're going to match to
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# Commands to find out what we should write in to memory.
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class Instruction
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attr_accessor :opcode, :machine, :parameters
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def initialize message, machine
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self.machine = machine
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self.opcode, *self.parameters = message
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self.opcode = opcode.to_s.upcase
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self.machine = parameters[1].machine unless machine
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self.parameters.map! { |each| Proc === each ? each.call.m : each }
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self.parameters.each do |each|
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each.machine = self.machine if each.is_a? Operand
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end
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end
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def first
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parameters.first
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end
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def second
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parameters.second
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end
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def get_address
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parameters.detect { |e| e.is_a?(Address) }
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end
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def assemble
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instructions = machine.instructions.select { |command|
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command.instruction_applies? self
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}
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return false if instructions.empty?
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bytes = instructions.map { |instruction| instruction.assemble self }
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sorted_bytes = bytes.sort_by {|byte| [byte.size, (byte[0]||0), (byte[1]||0)]}
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machine.stream.push(*sorted_bytes.first)
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true
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end
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def get_second_immediate
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parameters.detect { |e| e.is_a? Integer }
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end
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def get_immediate
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parameters.reverse.detect { |e| e.is_a? Integer }
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end
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end
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end
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