75 lines
3.3 KiB
Ruby
75 lines
3.3 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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source = "__init__"
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compiler = Soml::Compiler.new.create_method(:Kernel,:__init__ )
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# no method enter or return (automatically added), remove
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new_start = Label.new(source , source )
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compiler.method.instructions = new_start
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compiler.set_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 = compiler.use_reg(:Space)
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compiler.add_code LoadConstant.new(source, 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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compiler.add_code Register.get_slot( source , space_reg , message_ind , :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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compiler.add_code Register.set_slot( source, space_reg , :message , :receiver)
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exit_label = Label.new("_exit_label" , "#{compiler.clazz.name}.#{compiler.method.name}" )
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ret_tmp = compiler.use_reg(:Label)
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compiler.add_code Register::LoadConstant.new(source, exit_label , ret_tmp)
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compiler.add_code Register.set_slot(source, ret_tmp , :message , :return_address)
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# do the register call
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compiler.add_code FunctionCall.new( source , Register.machine.space.get_main )
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compiler.add_code exit_label
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emit_syscall( compiler , :exit )
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return compiler.method
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end
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def exit context
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compiler = Soml::Compiler.new.create_method(:Kernel,:exit ).init_method
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emit_syscall( compiler , :exit )
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return compiler.method
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end
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def emit_syscall compiler , name
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save_message( compiler )
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compiler.add_code Syscall.new("emit_syscall(#{name})", name )
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restore_message(compiler)
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return unless (@clazz and @method)
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compiler.add_code Label.new( "#{@clazz.name}.#{@message.name}" , "return_syscall" )
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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(compiler)
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r8 = RegisterValue.new( :r8 , :Message)
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compiler.add_code RegisterTransfer.new("save_message", Register.message_reg , r8 )
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end
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def restore_message(compiler)
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r8 = RegisterValue.new( :r8 , :Message)
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return_tmp = Register.tmp_reg :Integer
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source = "_restore_message"
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# get the sys return out of the way
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compiler.add_code RegisterTransfer.new(source, Register.message_reg , return_tmp )
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# load the stored message into the base RegisterMachine
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compiler.add_code RegisterTransfer.new(source, r8 , Register.message_reg )
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# save the return value into the message
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compiler.add_code Register.set_slot( source , return_tmp , :message , :return_value )
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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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