111 lines
5.2 KiB
Ruby
111 lines
5.2 KiB
Ruby
module Virtual
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# Booting is a complicated, so it is extracted into this file, even it has only one entry point
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class Machine
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# The general idea is that compiling is creating an object graph. Functionally
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# one tends to think of methods, and that is complicated enough, sure.
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# but for an object system the graph includes classes and all instance variables
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#
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# And so we have a chicken and egg problem. At the end of the function we want to have a
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# working Space object
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# But that has instance variables (List and Dictionary) and off course a class.
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# Or more precisely in salama, a Layout, that points to a class.
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# So we need a Layout, but that has Layout and Class too. hmmm
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#
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# The way out is to build empty shell objects and stuff the neccessary data into them
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# (not use the normal initialize way)
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def boot_parfait!
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@space = Parfait::Space.new_object
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# map from the vm - class_name to the Parfait class (which carries parfait name)
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class_mappings = {} #will later become instance variable
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values = [ "Value" , "Integer" , "Kernel" , "Object"].collect {|cl| Virtual.new_word(cl) }
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value_classes = values.collect { |cl| @space.create_class(cl,nil) }
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layouts = { "Word" => [] ,
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"List" => [] ,
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"Message" => [],
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"BinaryCode" => [],
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"Space" => ["classes","objects","frames","messages","next_message","next_frame"],
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"Frame" => ["locals" , "tmps" ],
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"Layout" => ["object_class"] ,
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"Class" => ["object_layout"],
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"Dictionary" => ["keys" , "values"] ,
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"Method" => ["name" , "code" ,"arg_names" , "locals" , "tmps"] ,
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"Module" => ["name" , "instance_methods", "super_class", "meta_class"]
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}
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layouts.each do |name , layout|
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class_mappings[name] = @space.create_class(Virtual.new_word(name) , nil)
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end
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value_classes[1].set_super_class( value_classes[0] ) # #set superclass (value) for integer
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value_classes[2].set_super_class( value_classes[0] ) # and kernel (TODO is module)
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value_classes[3].set_super_class( value_classes[2] ) # and object (TODO hacked to kernel)
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class_mappings.each do |name , clazz| # and the rest
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clazz.set_super_class(value_classes[3]) # superclasses are object
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end
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# next create layouts by adding instance variable names to the layouts
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class_mappings.each do |name , clazz|
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variables = layouts[name]
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variables.each do |var_name|
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clazz.object_layout.add_instance_variable Virtual.new_word(var_name)
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end
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end
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# now store the classes so we can hand them out later during object creation
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# this can not be done earlier, as parfait objects are all the time created and would
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# lookup half created class info
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# but it must be done before going through the objects (next step)
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@class_mappings = class_mappings
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class_mappings["Integer"] = value_classes[1] #need for further booting
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class_mappings["Kernel"] = value_classes[2] #need for further booting
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class_mappings["Object"] = value_classes[3] #need for further booting
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# add space and instances which get created before the objects list
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[@space,@space.classes,@space.classes.keys, @space.classes.values,@space.objects].each do |o|
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@space.add_object o
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end
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@space.late_init
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# now update the layout on all objects created so far,
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# go through objects in space
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@space.objects.each do | o |
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o.init_layout
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end
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boot_functions!
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end
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# classes have booted, now create a minimal set of functions
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# minimal means only that which can not be coded in ruby
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# Methods are grabbed from respective modules by sending the method name. This should return the
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# implementation of the method (ie a method object), not actually try to implement it
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# (as that's impossible in ruby)
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def boot_functions!
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# very fiddly chicken 'n egg problem. Functions need to be in the right order, and in fact we
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# have to define some dummies, just for the other to compile
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# TODO: go through the virtual parfait layer and adjust function names to what they really are
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obj = @class_mappings["Object"]
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[:index_of , :_get_instance_variable , :_set_instance_variable].each do |f|
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obj.add_instance_method Builtin::Object.send(f , nil)
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end
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obj = @class_mappings["Kernel"]
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# create dummy main first, __init__ calls it
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[:putstring,:exit,:__send , :main ].each do |f|
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obj.add_instance_method Builtin::Kernel.send(f , nil)
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end
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underscore_init = obj.add_instance_method Builtin::Kernel.send(:__init__, nil)
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obj = @class_mappings["Integer"]
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[:putint,:fibo].each do |f|
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obj.add_instance_method Builtin::Integer.send(f , nil)
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end
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# and the @init block in turn _jumps_ to __init__
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# the point of which is that by the time main executes, all is "normal"
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@init = Block.new(:_init_ , nil )
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@init.add_code(Register::RegisterMain.new(underscore_init))
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end
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end
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end
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