Splitting NameExpression into three, Known,Local,Argument

The decision which to use can be made higher up, in ruby, and so it
should.

lib/melon/compilers/method_compiler.rb

@@ -14,7 +14,7 @@ module Melon
       def on_ivasgn(statement)
         name , value = *statement
         w = Vm::Tree::Assignment.new()
-        w.name = Vm::Tree::NameExpression.new( name[1..-1].to_sym)
+        w.name = Vm::Tree::InstanceName.new( name[1..-1].to_sym)
         w.value = process(value)
         w
       end
@@ -22,8 +22,8 @@ module Melon
       def on_ivar( var )
         name = var.children.first
         w = Vm::Tree::FieldAccess.new()
-        w.receiver = Vm::Tree::NameExpression.new(:self)
-        w.field = Vm::Tree::NameExpression.new( name[1..-1].to_sym)
+        w.receiver = Vm::Tree::KnownName.new(:self)
+        w.field = Vm::Tree::InstanceName.new( name[1..-1].to_sym)
         w
       end
 
@@ -31,12 +31,20 @@ module Melon
         receiver , name , args = *statement
         w = Vm::Tree::CallSite.new()
         puts "receiver #{statement}"
-        w.name = process(receiver)
+        w.name = name
         w.arguments = process(args)
-        w.receiver = nil
+        w.receiver = process(receiver)
         w
       end
 
+      def on_lvar(statement)
+        name = statement.children.first.to_sym
+        if(@ruby_method.args_type.variable_index(name))
+          return Vm::Tree::ArgumentName.new(name)
+        end
+        raise "Not found #{name}"
+      end
+
       def on_str( string )
         Vm::Tree::StringExpression.new(string.children.first)
       end

lib/register/builtin/compile_helper.rb

@@ -4,7 +4,7 @@ module Register
     module CompileHelper
 
       def self_and_int_arg(compiler , source)
-        me = compiler.process( Vm::Tree::NameExpression.new( :self) )
+        me = compiler.process( Vm::Tree::KnownName.new( :self) )
         int_arg = load_int_arg_at(compiler , source , 1 )
         return me , int_arg
       end

lib/register/builtin/integer.rb

@@ -18,9 +18,9 @@ module Register
         def div10 context
           s = "div_10"
           compiler = Vm::MethodCompiler.new.create_method(:Integer,:div10 ).init_method
-          me = compiler.process( Vm::Tree::NameExpression.new( :self) )
-          tmp = compiler.process( Vm::Tree::NameExpression.new( :self) )
-          q = compiler.process( Vm::Tree::NameExpression.new( :self) )
+          me = compiler.process( Vm::Tree::KnownName.new( :self) )
+          tmp = compiler.process( Vm::Tree::KnownName.new( :self) )
+          q = compiler.process( Vm::Tree::KnownName.new( :self) )
           const = compiler.process( Vm::Tree::IntegerExpression.new(1) )
           # int tmp = self >> 1
           compiler.add_code Register.op( s , ">>" , tmp , const)

lib/vm/method_compiler/name_expression.rb

@@ -5,20 +5,18 @@ module Vm
       # compiling name needs to check if it's a local variable
       # or an argument
       # whichever way this goes the result is stored in the return slot (as all compiles)
-      def on_NameExpression statement
+      def on_KnownName statement
         name = statement.name
         [:self , :space , :message].each do |special|
           return send(:"load_special_#{special}" , statement ) if name == special
         end
-        return load_argument(statement) if( @method.has_argument(name))
-        load_local(statement)
+        raise "Unknow 'known' expression #{name}"
       end
 
-      private
-
-      def load_argument(statement)
+      def on_ArgumentName(statement)
         name = statement.name
         index = @method.has_argument(name)
+        raise "no arg #{name}" unless index
         named_list = use_reg :NamedList
         ret = use_reg @method.arguments_type(index)
         #puts "For #{name} at #{index} got #{@method.arguments.inspect}"
@@ -27,10 +25,10 @@ module Vm
         return ret
       end
 
-      def load_local( statement )
+      def on_LocalName( statement )
         name = statement.name
         index = @method.has_local( name )
-        raise "must define variable '#{name}' before using it" unless index
+        raise "must define local '#{name}' before using it" unless index
         named_list = use_reg :NamedList
         add_slot_to_reg("#{name} load locals" , :message , :locals , named_list )
         ret = use_reg @method.locals_type( index )

lib/vm/tree/basic_values.rb

@@ -36,6 +36,7 @@ module Vm
         @value = value
       end
     end
+
     class NameExpression < Expression
       include ValuePrinter
       attr_accessor :value
@@ -44,6 +45,16 @@ module Vm
         @value = value
       end
     end
+
+    class  LocalName < NameExpression
+    end
+    class  ArgumentName < NameExpression
+    end
+    class  InstanceName < NameExpression
+    end
+    class  KnownName < NameExpression
+    end
+
     class ClassExpression < Expression
       include ValuePrinter
       attr_accessor :value

lib/vm/tree/to_code.rb

@@ -85,9 +85,9 @@ module Vm
     end
 
     def on_call statement
-      name_s , arguments , receiver = *statement
+      name , arguments , receiver = *statement
       w = Tree::CallSite.new()
-      w.name = name_s.children.first
+      w.name = name
       w.arguments = process_all(arguments)
       w.receiver = process(receiver)
       w
@@ -109,8 +109,17 @@ module Vm
       Tree::NilExpression.new
     end
 
-    def on_name statement
-      Tree::NameExpression.new(statement.children.first)
+    def on_arg statement
+      Tree::ArgumentName.new(statement.children.first)
+    end
+    def on_local statement
+      Tree::LocalName.new(statement.children.first)
+    end
+    def on_ivar statement
+      Tree::InstanceName.new(statement.children.first)
+    end
+    def on_known statement
+      Tree::KnownName.new(statement.children.first)
     end
 
     def on_string expression