split compiled_method into method and compiled_method_info

lib/parfait/method.rb

@@ -0,0 +1,70 @@
+# A Method (at runtime , sis in Parfait) is static object that primarily holds the executable
+# code.
+
+# For reflection also holds arguments and such
+
+#
+
+module Parfait
+
+  # static description of a method
+  # name
+  # arg_names
+  # known local variable names
+  # temp variables (numbered)
+  # executable code
+
+  # ps, the compiler injects its own info, see virtual::compiled_method_info
+
+
+  class Method < Object
+
+    def initialize name , arg_names
+      @name = name
+      @arg_names = arg_names
+      @locals = []
+      @tmps = []
+    end
+    attr_reader :name , :arg_names
+    attr_accessor :for_class
+
+
+    # determine whether this method has a variable by the given name
+    # variables are locals and and arguments
+    # used to determine if a send must be issued
+    # return index of the name into the message if so
+    def has_var name
+      name = name.to_sym
+      index = has_arg(name)
+      return index if index
+      has_local(name)
+    end
+
+    # determine whether this method has an argument by the name
+    def has_arg name
+      @arg_names.index_of name.to_sym
+    end
+
+    # determine if method has a local variable or tmp (anonymous local) by given name
+    def has_local name
+      name = name.to_sym
+      index = @locals.index(name)
+      index = @tmps.index(name) unless index
+      index
+    end
+
+    def ensure_local name
+      index = has_local name
+      return index if index
+      @locals << name
+      @locals.length
+    end
+
+    def get_var name
+      var = has_var name
+      raise "no var #{name} in method #{self.name} , #{@locals} #{@arg_names}" unless var
+      var
+    end
+
+  end
+end