remove unnecessary ReadArgumentNode

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/AccessArgumentNode.java

@@ -40,6 +40,7 @@ import com.oracle.truffle.r.nodes.function.PromiseHelperNode;
 import com.oracle.truffle.r.nodes.function.opt.EagerEvalHelper;
 import com.oracle.truffle.r.nodes.function.opt.OptConstantPromiseNode;
 import com.oracle.truffle.r.nodes.function.opt.OptVariablePromiseBaseNode;
+import com.oracle.truffle.r.runtime.RArguments;
 import com.oracle.truffle.r.runtime.RInternalError;
 import com.oracle.truffle.r.runtime.data.REmpty;
 import com.oracle.truffle.r.runtime.data.RMissing;
@@ -56,8 +57,6 @@ import com.oracle.truffle.r.runtime.nodes.RNode;
  */
 public final class AccessArgumentNode extends RNode {
 
-    @Child private ReadArgumentNode readArgNode;
-
     @Child private PromiseHelperNode promiseHelper;
 
     /**
@@ -65,10 +64,6 @@ public final class AccessArgumentNode extends RNode {
      */
     private final int index;
 
-    public ReadArgumentNode getReadArgNode() {
-        return readArgNode;
-    }
-
     /**
      * Used to cache {@link RPromise} evaluations.
      */
@@ -84,7 +79,6 @@ public final class AccessArgumentNode extends RNode {
 
     private AccessArgumentNode(int index) {
         this.index = index;
-        this.readArgNode = new ReadArgumentNode(index);
     }
 
     public static AccessArgumentNode create(int index) {
@@ -100,7 +94,7 @@ public final class AccessArgumentNode extends RNode {
 
     @Override
     public Object execute(VirtualFrame frame) {
-        return doArgument(frame, readArgNode.execute(frame));
+        return doArgument(frame, RArguments.getArgument(frame, index));
     }
 
     @Override

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/access/ReadArgumentNode.java

-/*
- * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package com.oracle.truffle.r.nodes.access;
-
-import com.oracle.truffle.api.frame.VirtualFrame;
-import com.oracle.truffle.r.runtime.RArguments;
-import com.oracle.truffle.r.runtime.nodes.RNode;
-
-class ReadArgumentNode extends RNode {
-
-    private final int index;
-
-    protected ReadArgumentNode(int index) {
-        this.index = index;
-    }
-
-    /**
-     * for WrapperNode subclass.
-     */
-    protected ReadArgumentNode() {
-        index = 0;
-    }
-
-    @Override
-    public Object execute(VirtualFrame frame) {
-        return RArguments.getArgument(frame, index);
-    }
-
-    public int getIndex() {
-        return index;
-    }
-}