141 lines
4.3 KiB
Ruby
141 lines
4.3 KiB
Ruby
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# A Space is a collection of pages. It stores objects, the data for the objects,
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# not references. See Page for more detail.
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# Pages are stored by the object size they represent in a hash.
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# Space and Page work together in making *new* objects available.
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# "New" is slightly misleading in that normal operation only ever
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# recycles objects.
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module Parfait
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# Make the object space globally available
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def self.object_space
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@@object_space
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end
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# TODO Must get rid of the setter (move the boot process ?)
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def self.set_object_space( space )
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@@object_space = space
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end
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# The Space 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".
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# This _must be supplied by the compled code (similar to c)
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# There is a start and exit block that call main, which receives an List 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 Space < Object
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def initialize( classes )
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@classes = classes
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@types = Dictionary.new
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message = Message.new(nil)
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101.times { @next_integer = Integer.new(0,@next_integer) }
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50.times do
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@first_message = Message.new message
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message.set_caller @first_message
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message = @first_message
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end
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@classes.each do |name , cl|
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add_type(cl.instance_type)
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end
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@true_object = Parfait::TrueClass.new
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@false_object = Parfait::FalseClass.new
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@nil_object = Parfait::NilClass.new
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end
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attr_reader :classes , :types , :first_message , :next_integer
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attr_reader :true_object , :false_object , :nil_object
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# hand out one of the preallocated ints for use as constant
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# the same code is hardcoded as risc instructions for "normal" use, to
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# avoid the method call at runtime. But at compile time we want to keep
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# the number of integers known (fixed).
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def get_integer
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int = @next_integer
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@next_integer = @next_integer.next_integer
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int
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end
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def each_type
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@types.values.each do |type|
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yield(type)
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end
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end
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def add_type( type )
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hash = type.hash
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raise "upps #{hash} #{hash.class}" unless hash.is_a?(Fixnum)
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was = @types[hash]
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return was if was
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@types[hash] = type
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end
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def get_type_for( hash )
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@types[hash]
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end
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# all methods form all types
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def get_all_methods
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methods = []
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each_type do | type |
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type.each_method do |meth|
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methods << meth
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end
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end
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methods
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end
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def get_main
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space = get_class_by_name :Space
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space.instance_type.get_method :main
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end
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def get_init
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object = get_class_by_name :Object
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object.instance_type.get_method :__init__
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end
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# get a class by name (symbol)
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# return nili if no such class. Use bang version if create should be implicit
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def get_class_by_name( name )
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raise "get_class_by_name #{name}.#{name.class}" unless name.is_a?(Symbol)
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c = @classes[name]
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#puts "MISS, no class #{name} #{name.class}" unless c # " #{@classes}"
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#puts "CLAZZ, #{name} #{c.get_type.get_length}" if c
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c
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end
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# get or create the class by the (symbol) name
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# notice that this method of creating classes implies Object superclass
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def get_class_by_name!(name , super_class = :Object)
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c = get_class_by_name(name)
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return c if c
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create_class( name ,super_class)
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end
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# this is the way to instantiate classes (not Parfait::Class.new)
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# so we get and keep exactly one per name
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def create_class( name , superclass = nil )
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raise "create_class #{name.class}" unless name.is_a? Symbol
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superclass = :Object unless superclass
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raise "create_class #{superclass.class}" unless superclass.is_a? Symbol
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type = get_class_by_name(superclass).instance_type
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c = Class.new(name , superclass , type )
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@classes[name] = c
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end
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def rxf_reference_name
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"space"
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end
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end
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# ObjectSpace
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# :each_object, :garbage_collect, :define_finalizer, :undefine_finalizer, :_id2ref, :count_objects
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end
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