first go at translating DynamicCall to risc

lib/mom/instruction/dynamic_call.rb

@@ -18,8 +18,18 @@ module Mom
       @cache_entry = Parfait::CacheEntry.new(type, method)
     end
 
-    def to_risc(context)
-      Risc::Label.new(self,"DynamicCall")
+    # One could almost think that one can resolve this to a Risc::FunctionCall
+    #  (which btw resolves to a simple jump), alas, the FunctionCall, like all other
+    # jumping, resolves the address at compile time.
+    #
+    # Instead we need a DynamicJump instruction that explicitly takes a register as
+    # a target (not a label)
+    def to_risc(compiler)
+      reg = compiler.use_reg( :int )
+      call =  Risc.load_constant( self , @cache_entry , reg )
+      method_index = Risc.resolve_to_index(:cache_entry , :cached_method)
+      call << Risc::SlotToReg.new( self , reg ,method_index, reg)
+      call << Risc::DynamicJump.new(self, reg )
     end
   end
 

lib/risc/instructions/branch.rb

@@ -53,6 +53,20 @@ module Risc
 
   end
 
+  # dynamic version of an Unconditional branch that jumps to the contents
+  # of a register instead of a hardcoded address
+  # As Branches jump to Labels, this is not derived from Branch
+  # PS: to conditionally jump to a dynamic adddress we do a normal branch
+  #     over the dynamic one and then a dynamic one. Save us having all types of branches
+  #     in two versions
+  class DynamicJump < Instruction
+    def initialize( source , register )
+      super(source)
+      @register = register
+    end
+    attr_reader :register
+  end
+
   # branch if two registers contain same value
   class IsSame < Branch
     attr_reader :left , :right