ruby: slicc: remove member buffer_expr from Var class

This was added by changeset 51f40b101a56.  Instead, buffer_expr would now be
associated with the InPort class.

src/mem/slicc/ast/InPortDeclAST.py

@@ -58,8 +58,9 @@ class InPortDeclAST(DeclAST):
                        queue_type)
 
         type = self.queue_type.type
+        self.pairs["buffer_expr"] = self.var_expr
         in_port = Var(self.symtab, self.ident, self.location, type, str(code),
-                      self.pairs, machine, self.var_expr)
+                      self.pairs, machine)
         symtab.newSymbol(in_port)
 
         symtab.pushFrame()

src/mem/slicc/symbols/StateMachine.py

@@ -196,7 +196,7 @@ class StateMachine(Symbol):
         port_to_buf_map = {}
         in_msg_bufs = {}
         for port in self.in_ports:
-            buf_name = "m_%s_ptr" % port.buffer_expr.name
+            buf_name = "m_%s_ptr" % port.pairs["buffer_expr"].name
             msg_bufs.append(buf_name)
             port_to_buf_map[port] = msg_bufs.index(buf_name)
             if buf_name not in in_msg_bufs:

src/mem/slicc/symbols/Var.py

@@ -29,10 +29,9 @@ from slicc.symbols.Symbol import Symbol
 
 class Var(Symbol):
     def __init__(self, symtab, ident, location, type, code, pairs,
-                 machine=None, buffer_expr=""):
+                 machine=None):
         super(Var, self).__init__(symtab, ident, location, pairs)
 
-        self.buffer_expr = buffer_expr
         self.machine = machine
         self.type = type
         self.code = code