128 lines
4.5 KiB
Ruby
128 lines
4.5 KiB
Ruby
require_relative "boot_class"
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require "builtin/object"
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require "parfait/hash"
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module Virtual
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# The BootSpace contains all objects for a program. In functional terms it is a program, but in oo
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# it is a collection of objects, some of which are data, some classes, some functions
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# The main entry is a function called (of all things) "main", This _must be supplied by the compling
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# There is a start and exit block that call main, which receives an array of strings
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# While data ususally would live in a .data section, we may also "inline" it into the code
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# in an oo system all data is represented as objects
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class BootSpace < Virtual::ObjectConstant
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def initialize
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super()
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@classes = Parfait::Hash.new
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@main = Virtual::CompiledMethod.new("main" , [] )
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#global objects (data)
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@objects = []
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@symbols = []
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frames = 100.times.collect{ ::Frame.new }
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@messages = 100.times.collect{ ::Message.new } + frames
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@next_message = @messages.first
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@next_frame = frames.first
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@passes = [ Virtual::SendImplementation ]
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end
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attr_reader :main , :classes , :objects , :symbols,:messages, :next_message , :next_frame
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def run_passes
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@passes.each do |pass|
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all = main.blocks
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@classes.values.each do |c|
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c.instance_methods.each {|f| all += f.blocks }
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end
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all.each do |block|
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pass.new.run(block)
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end
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end
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end
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def self.space
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if defined? @@space
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@@space
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else
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@@space = BootSpace.new
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@@space.boot_classes! # boot is a verb here
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@@space
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end
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end
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# Passes are initiated empty and added to by anyone who want (basically)
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# Even linking and assembly are passes and so there are quite a few system passes neccesary to result in a
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# working binary. Other than that, this is intentionally quite flexible
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def add_pass_after( pass , after)
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index = @passes.index(after)
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raise "No such pass to add after: #{after}" unless index
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@passes.insert(index+1 , pass)
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end
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def add_pass_before( pass , after)
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index = @passes.index(after)
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raise "No such pass to add after: #{after}" unless index
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@passes.insert(index , pass)
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end
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# boot the classes, ie create a minimal set of classes with a minimal set of functions
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# minimal means only that which can not be coded in ruby
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# CompiledMethods 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 (as that's impossible in ruby)
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def boot_classes!
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# very fiddly chicken 'n egg problem. Functions need to be in the right order, and in fact we have to define some
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# dummies, just for the other to compile
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obj = get_or_create_class :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 , @context)
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end
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obj = get_or_create_class :Kernel
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[:main , :__init__,:putstring,:exit,:__send].each do |f|
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obj.add_instance_method Builtin::Kernel.send(f , @context)
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end
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obj = get_or_create_class :Integer
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[:putint,:fibo].each do |f|
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obj.add_instance_method Builtin::Integer.send(f , @context)
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end
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obj = get_or_create_class :String
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[:get , :set , :puts].each do |f|
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obj.add_instance_method Builtin::String.send(f , @context)
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end
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obj = get_or_create_class :Array
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[:get , :set , :push].each do |f|
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obj.add_instance_method Builtin::Array.send(f , @context)
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end
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end
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@@SPACE = { :names => [:classes,:objects,:symbols,:messages,:frames] ,
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:types => [Virtual::Reference,Virtual::Reference,Virtual::Reference,Virtual::Reference,Virtual::Reference]}
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def layout
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@@SPACE
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end
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# Objects are data and get assembled after functions
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def add_object o
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return if @objects.include?(o)
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@objects << o
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if o.is_a? Symbol
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@symbols << o
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end
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end
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# this is the way to instantiate classes (not BootClass.new)
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# so we get and keep exactly one per name
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def get_or_create_class name
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raise "uups #{name}.#{name.class}" unless name.is_a? Symbol
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c = @classes[name]
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unless c
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c = BootClass.new(name)
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@classes[name] = c
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end
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c
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end
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def mem_length
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padded_words( 5 )
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end
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end
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end
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