61 lines
1.6 KiB
Ruby
61 lines
1.6 KiB
Ruby
require "util/eventable"
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module Risc
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module Position
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class ObjectPosition
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include Util::Eventable
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attr_reader :at , :object
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# initialize with a given object, first parameter
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# The object ill be the key in global position map
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# Give an integer as the actual position, where -1
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# which means no legal position known
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def initialize(object , pos )
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@at = pos
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@object = object
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Position.set_to(self , pos)
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end
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#look for InstructionListener and return its code if found
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def get_code
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listener = event_table.find{|one| one.class == InstructionListener}
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return nil unless listener
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listener.code
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end
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def +(offset)
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offset = offset.at if offset.is_a?(ObjectPosition)
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@at + offset
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end
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def -(offset)
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offset = offset.at if offset.is_a?(ObjectPosition)
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@at - offset
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end
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def to_s
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"0x#{@at.to_s(16)}"
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end
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# just a callback after creation AND insertion
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def init(pos , is_nil)
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end
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def reset_to(pos , guaranteed_nil )
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return false if pos == at
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if((at - pos).abs > 1000)
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raise "position set too far off #{pos}!=#{at} for #{object}:#{object.class}"
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end
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@at = pos
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trigger(:position_changed , self)
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true
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end
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def next_slot
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return -1 if at < 0
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at + object.byte_length
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end
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def self.init(object , at = -1)
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position = ObjectPosition.new(object , at)
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Position.set_to( position , at)
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end
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end
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end
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end
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