79 lines
3.7 KiB
Ruby
79 lines
3.7 KiB
Ruby
module Register
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module Builtin
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module Kernel
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module ClassMethods
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# this is the really really first place the machine starts (apart from the jump here)
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# it isn't really a function, ie it is jumped to (not called), exits and may not return
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# so it is responsible for initial setup
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def __init__ context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel,:__init__ , [])
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function.info.return_type = Virtual::Integer
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# no method enter or return (automatically added), remove
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function.info.blocks.first.codes.pop # no Method enter
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function.info.blocks.last.codes.pop # no Method return
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#Set up the Space as self upon init
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space = Parfait::Space.object_space
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function.info.add_code LoadConstant.new( space , Register.self_reg)
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message_ind = Register.resolve_index( :space , :first_message )
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# Load the message to new message register (r3)
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function.info.add_code Register.get_slot( :self , message_ind , :new_message)
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# And store the space as the new self (so the call can move it back as self)
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function.info.add_code Register.set_slot( :self , :new_message , :receiver)
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# now we are set up to issue a call to the main
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function.info.add_code Virtual::MethodCall.new(Virtual.machine.space.get_main)
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emit_syscall( function , :exit )
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return function
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end
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def exit context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel,:exit , [])
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function.info.return_type = Virtual::Integer
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return function
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ret = Virtual::RegisterMachine.instance.exit(function)
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function.set_return ret
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function
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end
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def __send context
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function = Virtual::CompiledMethodInfo.create_method(:Kernel ,:__send , [] )
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function.info.return_type = Virtual::Integer
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return function
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end
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def emit_syscall function , name
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save_message( function )
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function.info.add_code Syscall.new( name )
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restore_message(function)
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end
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# save the current message, as the syscall destroys all context
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#
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# currently HACKED into the space as a temporary varaible. As the space is a globally
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# unique object we can retrieve it from there
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# TODO : fix this to use global (later per thread) variable
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def save_message(function)
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space_tmp = Register.tmp_reg
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ind = Register.resolve_index( :space , :syscall_message )
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function.info.add_code LoadConstant.new( Parfait::Space.object_space , space_tmp)
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function.info.add_code SetSlot.new( Register.message_reg , space_tmp , ind)
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end
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def restore_message(function)
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# get the sys return out of the way
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return_tmp = Register.tmp_reg
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function.info.add_code RegisterTransfer.new( Register.message_reg , return_tmp )
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# load the space into the base register
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function.info.add_code LoadConstant.new(Parfait::Space.object_space ,Register.message_reg)
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# find the stored message
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ind = Register.resolve_index( :space , :syscall_message )
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# and load it into the base RegisterMachine
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function.info.add_code Register.get_slot :message , ind , :message
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# save the return value into the message
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function.info.add_code Register.set_slot( return_tmp , :message , :return_value )
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# and "unroll" self and frame
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function.info.add_code Register.get_slot(:message , :receiver, :self )
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function.info.add_code Register.get_slot(:message , :frame , :frame)
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end
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end
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extend ClassMethods
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end
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end
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end
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