Move place function to instance class rather than hierarchy.

compiler/base/geometry.py

@@ -195,6 +195,14 @@ class instance(geometry):
                               mirror=self.mirror,
                               rotate=self.rotate)
 
+    def place(self, offset, mirror="R0", rotate=0):
+        """ This updates the placement of an instance. """
+        debug.info(3, "placing instance {}".format(self.name))
+        # Update the placement of an already added instance
+        self.offset = offset
+        self.mirror = mirror
+        self.rotate = rotate
+        self.update_boundary()
         
     
     def get_pin(self,name,index=-1):

compiler/base/hierarchy_layout.py

@@ -119,17 +119,6 @@ class layout(lef.lef):
             for pin in pin_list:
                 pin.rect = [pin.ll() - offset, pin.ur() - offset]
             
-    def place_inst(self, name, offset, mirror="R0", rotate=0):
-        """ This updates the placement of an instance. """
-        inst = self.get_inst(name)
-        debug.info(3, "placing instance {}".format(inst))
-        # Update the placement of an already added instance
-        inst.offset = offset
-        inst.mirror = mirror
-        inst.rotate = rotate
-        inst.update_boundary()
-        return inst
-
     def add_inst(self, name, mod, offset=[0,0], mirror="R0",rotate=0):
         """Adds an instance of a mod to this module"""
         self.insts.append(geometry.instance(name, mod, offset, mirror, rotate))