68 lines
2.9 KiB
Ruby
68 lines
2.9 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 = MethodSource.create_method(:Kernel,:__init__ , [])
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# no method enter or return (automatically added), remove
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new_start = Label.new(function , "__init__" )
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function.source.instructions = new_start
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function.source.current = new_start
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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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space_reg = Register.tmp_reg(:Space)
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function.source.add_code LoadConstant.new(function, space , space_reg)
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message_ind = Register.resolve_index( :space , :first_message )
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# Load the message to new message register (r1)
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function.source.add_code Register.get_slot( function , space_reg , 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.source.add_code Register.set_slot( function, space_reg , :new_message , :receiver)
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# now we are set up to issue a call to the main
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Register.issue_call( function , Register.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 = MethodSource.create_method(:Kernel,:exit , [])
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return function
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ret = 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 emit_syscall function , name
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save_message( function )
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function.source.add_code Syscall.new(function, 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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# This relies on linux to save and restore all registers
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#
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def save_message(function)
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r8 = RegisterValue.new( :r8 , :Message)
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function.source.add_code RegisterTransfer.new(function, Register.message_reg , r8 )
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end
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def restore_message(function)
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r8 = RegisterValue.new( :r8 , :Message)
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return_tmp = Register.tmp_reg :Integer
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# get the sys return out of the way
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function.source.add_code RegisterTransfer.new(function, Register.message_reg , return_tmp )
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# load the stored message into the base RegisterMachine
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function.source.add_code RegisterTransfer.new(function, r8 , Register.message_reg )
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# save the return value into the message
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function.source.add_code Register.set_slot( function, return_tmp , :message , :return_value )
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# and "unroll" self and 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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