Move the Main instruction from register to virtual

also needs a branch in register.
This way the register level is self sufficient
(noticed while writing debugger)

lib/arm/arm_machine.rb

@@ -112,6 +112,7 @@ module Arm
 end
 Arm::ArmMachine.init
 require_relative "passes/call_implementation"
+require_relative "passes/branch_implementation"
 require_relative "passes/syscall_implementation"
 require_relative "passes/save_implementation"
 require_relative "passes/transfer_implementation"
@@ -119,4 +120,3 @@ require_relative "passes/get_implementation"
 require_relative "passes/set_implementation"
 require_relative "passes/return_implementation"
 require_relative "passes/constant_implementation"
-require_relative "passes/main_implementation"

lib/arm/passes/branch_implementation.rb

@@ -0,0 +1,17 @@
+module Arm
+  # This implements branch logic, which is simply assembler branch
+  #
+  # The only target for a call is a Block, so we just need to get the address for the code
+  # and branch to it.
+  #
+  class BranchImplementation
+    def run block
+      block.codes.dup.each do |code|
+        next unless code.is_a? Register::Branch
+        br = ArmMachine.b( code.block )
+        block.replace(code , br )
+      end
+    end
+  end
+  Virtual.machine.add_pass "Arm::BranchImplementation"
+end

lib/arm/passes/main_implementation.rb

@@ -1,17 +0,0 @@
-module Arm
-
-  # "Boot" the register machine at the function given
-  # meaning jump to that function currently. Maybe better to do some machine setup
-  # and possibly some cleanup/exit has to tie in, but that is not this day
-
-  class MainImplementation
-    def run block
-      block.codes.dup.each do |code|
-        next unless code.is_a? Register::RegisterMain
-        call = ArmMachine.b( code.method )
-        block.replace(code , call )
-      end
-    end
-  end
-  Virtual.machine.add_pass "Arm::MainImplementation"
-end