75 lines
3.4 KiB
Ruby
75 lines
3.4 KiB
Ruby
module Risc
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module Builtin
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module Kernel
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module ClassMethods
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include CompileHelper
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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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compiler = Risc::MethodCompiler.create_method(:Kernel,:__init__ ,
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Parfait::NamedList.type_for({}) , Parfait::NamedList.type_for({}))
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space = Parfait.object_space
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space_reg = compiler.use_reg(:Space) #Set up the Space as self upon init
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compiler.add_load_constant("__init__ load Space", space , space_reg)
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message_ind = Risc.resolve_to_index( :space , :first_message )
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#load the first_message (instance of space)
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compiler.add_slot_to_reg( "__init__ load 1st message" , space_reg , message_ind , :message)
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compiler.add_mom( Mom::MessageSetup.new(compiler.method))
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# but use it's next message, so main can return normally
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compiler.add_slot_to_reg( "__init__ load 2nd message" , :message , :next_message , :message)
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compiler.add_reg_to_slot( "__init__ store Space in message", space_reg , :message , :receiver)
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#fixme: should add arg type here, as done in call_site (which this sort of is)
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exit_label = Risc.label("_exit_label for __init__" , "#{compiler.type.object_class.name}.#{compiler.method.name}" )
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ret_tmp = compiler.use_reg(:Label)
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compiler.add_load_constant("__init__ load return", exit_label , ret_tmp)
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compiler.add_reg_to_slot("__init__ store return", ret_tmp , :message , :return_address)
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compiler.add_function_call( "__init__ issue call" , Parfait.object_space.get_main , ret_tmp)
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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 = compiler_for(:Kernel,:exit ,{})
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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_label( "#{@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 = RiscValue.new( :r8 , :Message)
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compiler.add_transfer("save_message", Risc.message_reg , r8 )
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end
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def restore_message(compiler)
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r8 = RiscValue.new( :r8 , :Message)
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return_tmp = compiler.use_reg :fixnum
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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_transfer(source, Risc.message_reg , return_tmp )
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# load the stored message into the base register
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compiler.add_transfer(source, r8 , Risc.message_reg )
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int = compiler.use_reg(:Integer)
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compiler.add_new_int(source , return_tmp , int )
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# save the return value into the message
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compiler.add_reg_to_slot( source , int , :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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