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improve return implementation

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This commit is contained in:
Torsten Ruger 2014-09-23 19:20:55 +03:00
parent 4e01bc798f
commit c5765d4255
1 changed files with 10 additions and 8 deletions
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18
lib/register/return_implementation.rb
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@ -2,16 +2,18 @@ module Register
class ReturnImplementation
def run block
block.codes.dup.each do |code|
#TODO
- move message to new meesage
- restore caller message and self / frame
next unless code.is_a? Virtual::MethodReturn
new_codes = []
# move the current message to new_message
new_codes << RegisterMachine.instance.mov( Slot.MESSAGE_REGISTER , Slot::NEW_MESSAGE_REGISTER )
# and restore the message from saved value in new_message
new_codes << RegisterMachine.instance.ldr( Slot.MESSAGE_REGISTER ,Slot.NEW_MESSAGE_REGISTER , Virtual::Slot::MESSAGE_CALLER )
# "roll out" self and frame into their registers
new_codes << RegisterMachine.instance.ldr( Slot.SELF_REGISTER ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_SELF )
new_codes << RegisterMachine.instance.ldr( Slot.FRAME_REGISTER ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_FRAME )
#load the return address into pc, affecting return. (other cpus have commands for this, but not arm)
message = RegisterReference.new(:r0)
pc = RegisterReference.new(:pc)
move1 = RegisterMachine.instance.ldr( pc ,message , Virtual::Slot::MESSAGE_RETURN_VALUE )
block.replace(code , [move1] )
new_codes << RegisterMachine.instance.ldr( :pc ,Slot.MESSAGE_REGISTER , Virtual::Slot::MESSAGE_RETURN_ADDRESS )
block.replace(code , new_codes )
end
end
end