2014-08-26 11:05:49 +02:00
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module Register
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class ReturnImplementation
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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::MethodReturn
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2014-09-23 18:20:55 +02:00
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new_codes = []
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# move the current message to new_message
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new_codes << RegisterMachine.instance.mov( Slot.MESSAGE_REGISTER , Slot::NEW_MESSAGE_REGISTER )
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# and restore the message from saved value in new_message
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new_codes << RegisterMachine.instance.ldr( Slot.MESSAGE_REGISTER ,Slot.NEW_MESSAGE_REGISTER , Virtual::Slot::MESSAGE_CALLER )
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# "roll out" self and frame into their registers
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new_codes << RegisterMachine.instance.ldr( Slot.SELF_REGISTER ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_SELF )
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new_codes << RegisterMachine.instance.ldr( Slot.FRAME_REGISTER ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_FRAME )
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2014-09-11 18:00:14 +02:00
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#load the return address into pc, affecting return. (other cpus have commands for this, but not arm)
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2014-09-23 18:20:55 +02:00
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new_codes << RegisterMachine.instance.ldr( :pc ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_RETURN_ADDRESS )
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block.replace(code , new_codes )
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2014-08-26 11:05:49 +02:00
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end
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end
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end
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Virtual::BootSpace.space.add_pass_after ReturnImplementation , CallImplementation
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end
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