137 lines
4.7 KiB
Ruby
137 lines
4.7 KiB
Ruby
require_relative "boot_class"
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#require "vm/call_site"
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require "kernel/all"
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require_relative "object"
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require_relative "string"
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module Boot
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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
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# Initialize with a string for cpu. Naming conventions are: for Machine XXX there exists a module XXX
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# with a XXXMachine in it that derives from Virtual::RegisterMachine
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def initialize machine = nil
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super()
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@classes = {}
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@main = Virtual::MethodDefinition.new("main" , [] )
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#global objects (data)
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@objects = []
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boot_classes
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@passes = [ Virtual::SendImplementation ]
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end
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attr_reader :main , :classes , :objects
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def run_passes
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@passes.each do |pass|
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puts "Runnning pass #{pass}"
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all = main.blocks
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@classes.each_value 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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# 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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# MethodDefinitions 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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#puts "Boot Object::#{f}"
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obj.add_instance_method Boot::Object.send(f , @context)
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end
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[:putstring,:putint,:fibo,:exit].each do |f|
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#puts "Boot Kernel::#{f}"
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obj.add_instance_method Salama::Kernel.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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#puts "Boot String::#{f}"
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obj.add_instance_method Boot::String.send(f , @context)
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end
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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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# raise "must be derived from Code #{o.inspect}" unless o.is_a? Virtual::Code
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@objects << o # TODO check type , no basic values allowed (must be wrapped)
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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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# linking entry , exit , main , classes , objects
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def link_at( start , context)
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super
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@entry.link_at( start , context )
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start += @entry.length
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@exit.link_at( start , context)
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start += @exit.length
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@main.link_at( start , context )
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start += @main.length
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@classes.values.each do |clazz|
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clazz.link_at(start , context)
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start += clazz.length
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end
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@objects.each do |o|
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o.link_at(start , context)
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start += o.length
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end
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end
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# assemble in the same order as linked
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def assemble( io )
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link_at( @position , nil) #second link in case of forward declarations
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@entry.assemble( io )
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@exit.assemble( io )
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@main.assemble( io )
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@classes.values.each do |clazz|
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clazz.assemble(io)
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end
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@objects.each do |o|
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o.assemble(io)
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end
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io
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end
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end
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end
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