69 lines
2.3 KiB
Ruby
69 lines
2.3 KiB
Ruby
module Register
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# Plock (Proc-Block) is mostly a Block but also somewhat Proc-ish: A Block that carries data.
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#
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# Data in a Block is usefull in the same way data in objects is. Plocks being otherwise just code.
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#
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# But the concept is not quite straigtforwrd: If one thinks of a Plock embedded in a normal method,
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# the a data in the Plock would be static data. In OO terms this comes quite close to a Proc,
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# if the data is the local variables.
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# Quite possibly they shall be used to implement procs, but that is not the direction now.
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#
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# For now we use Plocks behaind the scenes as it were. In the code that you never see,
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# method invocation mainly.
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#
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# In terms of implementation the Plock is a Block with data
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# (Not too much data, mainly a couple of references).
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# The block writes it's instructions as normal, but a jump is inserted as the last instruction.
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# The jump is to the next block, over the data that is inserted after the block code
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# (and so before the next)
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#
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# It follows that Plocks should be linear blocks.
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class Plock < Block
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def initialize(name , method , next_block )
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super
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@data = []
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@branch_code = RegisterMachine.instance.b next_block
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end
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def set_next next_b
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super
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@branch_code = RegisterMachine.instance.b next_block
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end
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# Data gets assembled after methods
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def add_data o
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return if @objects.include? o
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raise "must be derived from Code #{o.inspect}" unless o.is_a? Register::Code
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@data << o # TODO check type , no basic values allowed (must be wrapped)
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end
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# Code interface follows. Note position is inheitted as is from Code
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# length of the Plock is the length of the block, plus the branch, plus data.
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def byte_length
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len = @data.inject(super) {| sum , item | sum + item.word_length}
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len + @branch_code.word_length
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end
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# again, super + branch plus data
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def link_at pos , context
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super(pos , context)
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@branch_code.link_at pos , context
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@data.each do |code|
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code.link_at(pos , context)
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pos += code.word_length
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end
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end
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# again, super + branch plus data
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def assemble(io)
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super
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@branch_code.assemble(io)
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@data.each do |obj|
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obj.assemble io
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end
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end
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end
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end
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