68 lines
1.4 KiB
Ruby
68 lines
1.4 KiB
Ruby
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require "eventable"
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class Interpreter
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include Eventable
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attr_accessor :instruction
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attr_accessor :block
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attr_accessor :registers
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def initialize
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@registers = Hash[(0...12).collect{|i| ["r#{i}" , "undefined"]}]
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end
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def start bl
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set_block bl
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end
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def set_block bl
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return if @block == bl
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raise "Error, nil block" unless bl
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old = @block
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@block = bl
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trigger(:block_changed , old , bl)
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set_instruction bl.codes.first
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end
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def set_instruction i
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return if @instruction == i
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raise "Error, nil instruction" unless i
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old = @instruction
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@instruction = i
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trigger(:instruction_changed, old , i)
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end
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def get_register( reg )
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reg = reg.symbol if reg.is_a? Register::RegisterReference
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raise "Not a register #{reg}" unless Register::RegisterReference.look_like_reg(reg)
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@registers[reg]
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end
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def set_register reg , val
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old = get_register( reg ) # also ensures format
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return if old === val
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@registers[reg] = val
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trigger(:register_changed, reg , old , val)
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end
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def tick
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name = @instruction.class.name.split("::").last
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fetch = send "execute_#{name}"
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return unless fetch
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get_next_intruction
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end
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def execute_Branch
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target = @instruction.block
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set_block target
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false
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end
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def execute_LoadConstant
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to = @instruction.register
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value = @instruction.constant.object_id
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set_register( to , value )
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true
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end
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end
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