92 lines
2.6 KiB
Ruby
92 lines
2.6 KiB
Ruby
module Parfait
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# A typed method object is a description of the method, it's name etc
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#
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# But the code that the method represents, the binary, is held as an array
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# in these. As Objects are fixed size (this one 16 words), we use linked list
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# and as the last code of each link is a jump to the next link.
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#
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class BinaryCode < Data16
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attr_reader :next
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def self.offset
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2 * 4 # size of type (2, type+next) * word_size (4)
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end
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def initialize(total_size)
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super()
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extend_to(total_size )
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#puts "Init with #{total_size} for #{object_id}"
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(0 ..(data_length)).each{ |index| set_word(index , 0) }
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end
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def extend_to(total_size)
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return unless total_size > self.data_length
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extend_one() unless @next
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@next.extend_to(total_size - data_length)
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end
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def extend_one()
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@next = BinaryCode.new(1)
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if Risc::Position.set?(self)
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Risc::Position.log.debug "extending one in #{self}"
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my_pos = Risc::Position.get(self)
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Risc::Position.reset(my_pos , my_pos.at , my_pos.method)
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end
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end
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def each( &block )
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block.call( self )
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@next.each( &block ) if @next
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end
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def to_s
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"BinaryCode #{Risc::Position.set?(self) ? Risc::Position.get(self): self.object_id.to_s(16)}"
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end
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def each_word
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index = 0
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while( index < data_length)
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yield get_word(index)
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index += 1
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end
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end
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#16 - 2 -1 , two instance variables and one for the jump
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def data_length
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13
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end
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def byte_length
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4*data_length
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end
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def set_word(index , word)
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raise "invalid index #{index}" if index < 0
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if index > data_length
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#raise "invalid index #{index}" unless @next
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extend_to( index )
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@next.set_word( index - data_length , word)
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end
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set_internal_word(index + 2 , word)
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end
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def get_word(index)
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raise "invalid index #{index}" if index < 0
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if index > data_length + 1
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raise "invalid index #{index}" unless @next
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return @next.get_word( index - data_length)
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end
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get_internal_word(index + 2)
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end
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def set_char(index , char)
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if index >= byte_length
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#puts "Pass it on #{index} for #{self.object_id}:#{@next.object_id}"
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return @next.set_char( index - byte_length , char )
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end
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word_index = (index - 1) / 4 + 2
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old = get_internal_word( word_index )
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old = old && char << ((index-1)%4)
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set_internal_word(word_index , char)
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end
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def total_byte_length(start = 0 )
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start += self.byte_length
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return start unless self.next
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self.next.total_byte_length(start)
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end
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end
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end
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