renamed the kernel dir/ module to Builtin (so to not confuse with ruby kernel module)

lib/builtin/README.md

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+### Builtin module
+
+The Builtin module contains functions that can not be coded in ruby. It is the other side of the parfait coin, part of 
+the runtime.
+
+The functions are organized by their respective class and get loaded in boot_classes! , right at the start.
+
+These functions return their code, ie a Virtual::CompiledMethod object, which can then be called by ruby code 
+as if it were a "normal"  function.
+
+A normal ruby function is one that is parsed and transformed to code. But not all functionality can be written in ruby, 
+one of those chicken and egg things. C uses Assembler in this situation, we use Kernel function.
+
+Slightly more here : http://salama.github.io/2014/06/10/more-clarity.html (then still called Kernel)
+
+The Builtin module is scattered into several files, but that is just so the file doesn't get too long.
+ 

lib/builtin/array.rb

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+module Builtin
+  class Array
+    module ClassMethods
+      def get context , index = Virtual::Integer
+        get_function = Virtual::CompiledMethod.new(:get , [ Virtual::Integer] , Virtual::Integer , Virtual::Integer )
+        return get_function
+      end
+      def set context , index = Virtual::Integer , object = Virtual::Reference
+        set_function = Virtual::CompiledMethod.new(:set , [Virtual::Integer, Virtual::Reference] )
+        return set_function
+      end
+      def push context , object = Virtual::Reference
+        push_function = Virtual::CompiledMethod.new(:push , [Virtual::Reference]  )
+        return push_function
+      end
+    end
+    extend ClassMethods    
+  end
+end

lib/builtin/integer.rb

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+#integer related kernel functions
+module Builtin
+  module Kernel
+    # The conversion to base10 is quite a bit more complicated than i thought. The bulk of it is in div10
+    # We set up variables, do the devision and write the result to the string
+    # then check if were done and recurse if neccessary
+    # As we write before we recurse (save a push) we write the number backwards
+    # arguments: string address , integer
+    def self.utoa context
+      utoa_function = Virtual::CompiledMethod.new(:utoa ,  [ Virtual::Integer ] , Virtual::Integer ,Virtual::Integer )
+      return utoa_function
+      str_addr = utoa_function.receiver
+      number = utoa_function.args.first
+      remainder = utoa_function.new_local
+      Virtual::RegisterMachine.instance.div10( utoa_function , number  , remainder )
+      # make char out of digit (by using ascii encoding) 48 == "0"
+      utoa_function.instance_eval do
+        add(  remainder , remainder , 48)
+        strb( remainder, str_addr ) 
+        sub(  str_addr,  str_addr ,  1 ) 
+        cmp(  number ,  0 )
+        callne( utoa_function  )
+      end
+      return utoa_function
+    end
+
+    def self.putint context
+      putint_function = Virtual::CompiledMethod.new(:putint , [] , Virtual::Integer ,Virtual::Integer )
+      return putint_function
+      buffer = Virtual::StringConstant.new("           ") # create a buffer
+      context.object_space.add_object buffer              # and save it (function local variable: a no no)
+      int = putint_function.receiver
+      moved_int = putint_function.new_local
+      utoa = context.object_space.get_or_create_class(:Object).resolve_function(:utoa)
+      putint_function.instance_eval do
+        mov( moved_int ,  int )     # move arg up
+        add( int ,  buffer ,nil )   # string to write to (add string address to pc)
+        add( int , int ,  buffer.length - 3) # 3 for good measure , ahem.
+        call( utoa )
+        after = new_block("after_call")
+        insert_at after
+        # And now we "just" have to print it, using the write_stdout
+        add( int ,  buffer , nil )   # string to write to
+        mov( moved_int ,  buffer.length )
+      end
+      Virtual::RegisterMachine.instance.write_stdout(putint_function)
+      putint_function
+    end
+
+    # testing method, hand coded fibo, expects arg in receiver_register 
+    # result comes in return_register
+    # a hand coded version of the fibonachi numbers
+    # not my hand off course, found in the net http://www.peter-cockerell.net/aalp/html/ch-5.html
+    def self.fibo context
+      fibo_function = Virtual::CompiledMethod.new(:fibo ,  [] , Virtual::Integer ,Virtual::Integer )
+      return fibo_function
+      result = fibo_function.return_type
+      int = fibo_function.receiver
+    
+      last = fibo_function.new_block("return")
+    
+      f1 = fibo_function.new_local
+      f2 = fibo_function.new_local
+    
+      fibo_function.instance_eval do
+        cmp  int , 1
+        mov( result, int , condition_code: :le)
+        ble( last ) #branch to return, rather than return (as the original)
+        mov f1 , 1        #set up initial values
+        mov f2 , 0
+      end
+
+      loop = fibo_function.new_block("loop")
+      fibo_function.insert_at loop
+    
+      fibo_function.instance_eval do #loop through 
+        add f1 , f1 , f2             # f1 = f1 + f2
+        sub f2 , f1 , f2             # f2 = f1 -f2
+        sub int ,  int , 1  # todo: set.. should do below cmp, but doesn't , set_update_status: 1
+        cmp int , 1
+        bne( loop )
+        mov( result , f1 )
+      end
+    
+      fibo_function
+    end
+
+  end
+end

lib/builtin/object.rb

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+module Builtin
+  class Object
+    module ClassMethods
+    
+      # return the index of the variable. Now "normal" code can't really do anything with that, but 
+      # set/get instance variable use it. 
+      # This is just a placeholder, as we code this in ruby, but the instance methods need the definition before.
+      def index_of context , name = Virtual::Integer
+        index_function = Virtual::CompiledMethod.new(:index_of , Virtual::Reference , [Virtual::Reference] , Virtual::Integer )
+        return index_function
+      end
+
+      def self.layout
+        layout_function = Virtual::Function.new(:layout , [ ] , Virtual::Reference  , Virtual::Reference )
+        layout_function.at_index 2
+        layout_function
+      end
+
+      # in ruby, how this goes is   
+      #  def _get_instance_variable var
+      #     i = self.index_of(var)
+      #     return at_index(i)
+      #  end  
+      # The at_index is just "below" the api, something we need but don't want to expose, so we can't code the above in ruby
+      def _get_instance_variable context , name = Virtual::Integer
+        get_function = Virtual::CompiledMethod.new(:_get_instance_variable , [ Virtual::Reference ] , Virtual::Reference ,Virtual::Mystery )
+        return get_function
+        me = get_function.receiver
+        var_name = get_function.args.first
+        return_to = get_function.return_type
+
+        index_function = context.object_space.get_or_create_class(:Object).resolve_function(:index_of)
+        get_function.push( [me] )
+        index = get_function.call( index_function )
+        
+        after_body = get_function.new_block("after_index")
+        get_function.current after_body
+        
+        get_function.pop([me])
+        return_to.at_index( get_function , me , return_to )
+        
+        get_function.set_return return_to
+        return get_function
+      end
+
+      def _set_instance_variable(context , name = Virtual::Integer , value = Virtual::Integer )
+        set_function = Virtual::CompiledMethod.new(:_set_instance_variable ,[Virtual::Reference ,Virtual::Reference], Virtual::Reference ,Virtual::Mystery )
+        return set_function
+        receiver set_function
+        me = set_function.receiver
+        var_name = set_function.args.first
+        return_to = set_function.return_type
+        index_function = context.object_space.get_or_create_class(:Object).resolve_function(:index_of)
+        set_function.push( [me] )
+        set_function.call( index_function )
+        after_body = set_function.new_block("after_index")
+        
+        set_function.current after_body
+        set_function.pop([me])
+        return_to.at_index( set_function , me , return_to )
+        set_function.set_return return_to
+        return set_function
+      end
+      
+      def _get_singleton_method(context , name )
+        raise name
+      end
+      def _add_singleton_method(context, method)
+        raise "4"
+      end
+      def initialize(context)
+        raise "4"
+      end
+    end
+    extend ClassMethods
+  end
+end
+require_relative "integer"
+require_relative "string"
+require_relative "array"
+require_relative "system"

lib/builtin/string.rb

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+module Builtin
+  module Kernel
+    def self.putstring context 
+      function = Virtual::CompiledMethod.new(:putstring , [] )
+      return function
+      ret = Virtual::RegisterMachine.instance.write_stdout(function)
+      function.set_return ret
+      function
+    end
+  end
+  class String
+    module ClassMethods
+      def get context , index = Virtual::Integer
+        get_function = Virtual::CompiledMethod.new(:get , [ Virtual::Integer] , Virtual::Integer , Virtual::Integer )
+        return get_function
+      end
+      def set context , index = Virtual::Integer , char = Virtual::Integer
+        set_function = Virtual::CompiledMethod.new(:set , [Virtual::Integer, Virtual::Integer] , Virtual::Integer ,Virtual::Integer )
+        return set_function
+      end
+      def puts context 
+        puts_function = Virtual::CompiledMethod.new(:puts , []  )
+        return puts_function
+      end
+    end
+    extend ClassMethods    
+  end
+end

lib/builtin/system.rb

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+module Builtin
+  module Kernel
+    def self.exit context
+      function = Virtual::CompiledMethod.new(:exit , [] , Virtual::Integer)
+      return function
+      ret = Virtual::RegisterMachine.instance.exit(function)
+      function.set_return ret
+      function
+    end
+  end
+end