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slight call logic modification

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simplification, new model is such that the upon start the method:
has a message in r0, works on it and returns to the return address.

Everything else is up to the caller
This commit is contained in:
Torsten Ruger 2015-11-07 21:59:39 +02:00
parent f2c7ed827d
commit 5ddc96718b
2 changed files with 5 additions and 5 deletions
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4
lib/register/instructions/function_call.rb
View File

@ -26,5 +26,9 @@ module Register
# do the register call
compiler.add_code FunctionCall.new( source , callee )
compiler.add_code return_label
# move the current message to new_message
compiler.add_code Register::RegisterTransfer.new(source, Register.message_reg , Register.new_message_reg )
# and restore the message from saved value in new_message
compiler.add_code Register.get_slot(source , :new_message , :caller , :message )
end
end

6
lib/soml/compiler.rb
View File

@ -86,12 +86,8 @@ module Soml
@method.instructions = Register::Label.new(source, "#{method.for_class.name}.#{method.name}")
@current = enter = method.instructions
add_code Register::Label.new( source, "return")
# move the current message to new_message
add_code Register::RegisterTransfer.new(source, Register.message_reg , Register.new_message_reg )
# and restore the message from saved value in new_message
add_code Register.get_slot("_init_method_",:new_message , :caller , :message )
#load the return address into pc, affecting return. (other cpus have commands for this, but not arm)
add_code Register::FunctionReturn.new( source , Register.new_message_reg , Register.resolve_index(:message , :return_address) )
add_code Register::FunctionReturn.new( source , Register.message_reg , Register.resolve_index(:message , :return_address) )
@current = enter
self
end