33 lines
1.4 KiB
Ruby
33 lines
1.4 KiB
Ruby
module Register
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# This implements the creation of a new message object
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#
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# It does so by loading the next message into the new_message register.
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#
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# Messages are created at compile time and form a linked list which actually never changes.
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# We just grab the next item of the list.
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# Just as a reminder: a message object is used for a send and holds return address/message
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# and arguments + self
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# while frames are used by a method and hold local and temporary variables
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# This was at first a little surprising, but it actually similar in c. When a c function pops to
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# stack, it doesn't create a new stack. Just increments some index. The storage/stack is reused,
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# stays constant. (until such time it runs out, which we haven't covered yet)
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#
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# Even stranger at first was the notion that the caller does not have to be set either.
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# That is contstant (a compile time property) too. It's a bit like when calling someone,
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#
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class MessageImplementation
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def run block
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block.codes.dup.each do |code|
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next unless code.is_a?(Virtual::NewMessage)
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# load the new_message from message by index, simple get_slot
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new_codes = [ Register.get_slot( :message , :next_message , Register.resolve_to_register(:new_message))]
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block.replace(code , new_codes )
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end
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end
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end
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Virtual.machine.add_pass "Register::MessageImplementation"
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end
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