change in register_names protocol

move to returning the attribute names
getting and setting can then be automated in the base class

lib/risc/instructions/branch.rb

@@ -12,7 +12,7 @@ module Risc
     attr_reader :label
 
     # return an array of names of registers that is used by the instruction
-    def register_names
+    def register_attributes
       []
     end
 

lib/risc/instructions/dynamic_jump.rb

@@ -13,8 +13,8 @@ module Risc
     attr_reader :register
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [register.symbol ]
+    def register_attributes
+      [:register ]
     end
 
     def to_s

lib/risc/instructions/function_call.rb

@@ -11,7 +11,7 @@ module Risc
     attr_reader :method
 
     # return an array of names of registers that is used by the instruction
-    def register_names
+    def register_attributes
       []
     end
 

lib/risc/instructions/function_return.rb

@@ -12,8 +12,8 @@ module Risc
     attr_reader :register
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [register.symbol]
+    def register_attributes
+      [:register]
     end
 
     def to_s

lib/risc/instructions/getter.rb

@@ -30,9 +30,9 @@ module Risc
     attr_accessor :array , :index , :register
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      names = [array.symbol , register.symbol]
-      names << index.symbol if index.is_a?(RegisterValue)
+    def register_attributes
+      names = [:array , :register]
+      names << :index if index.is_a?(RegisterValue)
       names
     end
 

lib/risc/instructions/instruction.rb

@@ -42,10 +42,33 @@ module Risc
     end
 
     # return an array of names of registers that is used by the instruction
-    def register_names
+    def register_attributes
       raise "Not implemented in #{self.class}"
     end
 
+    # return an array of names of registers that is used by the instruction
+    def register_names
+      register_attributes.collect {|attr| get_register(attr)}
+    end
+
+    # get the register value that has the name (ie attribute by that name)
+    # return the registers name ie RegisterValue's symbol
+    def get_register(name)
+      instance_variable_get("@#{name}".to_sym).symbol
+    end
+
+    # set all registers that has the name "name"
+    # going through the register_names and setting all where the
+    # get_register would return name
+    # Set to the value given as second arg.
+    def set_registers(name , value)
+      register_attributes.each do |attr|
+        reg = instance_variable_get("@#{attr}".to_sym)
+        next unless reg.symbol == name
+        reg.set_name(value)
+      end
+    end
+
     def to_cpu( translator )
       translator.translate( self )
     end

lib/risc/instructions/label.rb

@@ -24,7 +24,7 @@ module Risc
     attr_reader :name , :address
 
     # return an array of names of registers that is used by the instruction
-    def register_names
+    def register_attributes
       []
     end
 

lib/risc/instructions/load_constant.rb

@@ -15,8 +15,8 @@ module Risc
     attr_accessor :register , :constant
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [register.symbol]
+    def register_attributes
+      [:register]
     end
 
     def to_s

lib/risc/instructions/load_data.rb

@@ -18,8 +18,8 @@ module Risc
     attr_accessor :register , :constant
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [register.symbol]
+    def register_attributes
+      [:register]
     end
 
     def to_s

lib/risc/instructions/operator_instruction.rb

@@ -33,8 +33,8 @@ module Risc
     attr_reader :operator, :left , :right , :result
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [left.symbol , right.symbol, result.symbol]
+    def register_attributes
+      [:left , :right, :result]
     end
 
     def to_s

lib/risc/instructions/setter.rb

@@ -28,9 +28,9 @@ module Risc
     attr_accessor :register , :array , :index
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      names = [array.symbol , register.symbol]
-      names << index.symbol if index.is_a?(RegisterValue)
+    def register_attributes
+      names = [:array , :register]
+      names << :index if index.is_a?(RegisterValue)
       names
     end
 

lib/risc/instructions/syscall.rb

@@ -17,7 +17,7 @@ module Risc
     attr_reader :name
 
     # return an array of names of registers that is used by the instruction
-    def register_names
+    def register_attributes
       []
     end
 

lib/risc/instructions/transfer.rb

@@ -26,8 +26,8 @@ module Risc
     attr_reader :from, :to
 
     # return an array of names of registers that is used by the instruction
-    def register_names
-      [from.symbol , to.symbol]
+    def register_attributes
+      [:from , :to]
     end
 
     def to_s