new ParNode to represent parentheses in source code

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/RASTBuilder.java

@@ -39,6 +39,7 @@ import com.oracle.truffle.r.nodes.control.BreakNode;
 import com.oracle.truffle.r.nodes.control.ForNode;
 import com.oracle.truffle.r.nodes.control.IfNode;
 import com.oracle.truffle.r.nodes.control.NextNode;
+import com.oracle.truffle.r.nodes.control.ParNode;
 import com.oracle.truffle.r.nodes.control.RepeatNode;
 import com.oracle.truffle.r.nodes.control.ReplacementDispatchNode;
 import com.oracle.truffle.r.nodes.control.WhileNode;
@@ -100,7 +101,7 @@ public final class RASTBuilder implements RCodeBuilder<RSyntaxNode> {
                     case "repeat":
                         return new RepeatNode(source, lhsLookup, args.get(0).value);
                     case "(":
-                        return args.get(0).value;
+                        return new ParNode(source, args.get(0).value);
                 }
             } else if (args.size() == 2) {
                 switch (symbol) {

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/control/ParNode.java

+/*
+ * Copyright (c) 2015, 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.control;
+
+import com.oracle.truffle.api.frame.VirtualFrame;
+import com.oracle.truffle.api.nodes.ExplodeLoop;
+import com.oracle.truffle.api.source.SourceSection;
+import com.oracle.truffle.r.runtime.ArgumentsSignature;
+import com.oracle.truffle.r.runtime.nodes.RNode;
+import com.oracle.truffle.r.runtime.nodes.RSourceSectionNode;
+import com.oracle.truffle.r.runtime.nodes.RSyntaxCall;
+import com.oracle.truffle.r.runtime.nodes.RSyntaxElement;
+import com.oracle.truffle.r.runtime.nodes.RSyntaxLookup;
+import com.oracle.truffle.r.runtime.nodes.RSyntaxNode;
+
+/**
+ * A {@link ParNode} represents parentheses in source code.
+ */
+public final class ParNode extends RSourceSectionNode implements RSyntaxNode, RSyntaxCall {
+
+    @Child private RNode value;
+
+    public ParNode(SourceSection src, RSyntaxNode value) {
+        super(src);
+        this.value = value.asRNode();
+    }
+
+    @Override
+    @ExplodeLoop
+    public Object execute(VirtualFrame frame) {
+        return value.execute(frame);
+    }
+
+    @Override
+    public RSyntaxElement getSyntaxLHS() {
+        return RSyntaxLookup.createDummyLookup(getSourceSection(), "(", true);
+    }
+
+    @Override
+    public RSyntaxNode[] getSyntaxArguments() {
+        return new RSyntaxNode[]{value.asRSyntaxNode()};
+    }
+
+    @Override
+    public ArgumentsSignature getSyntaxSignature() {
+        return ArgumentsSignature.empty(1);
+    }
+}