add globalenv builtin, pretty print support for REnvironment

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/base/BasePackage.java

@@ -88,6 +88,7 @@ public class BasePackage extends RPackage {
         load(Exists.class);
         load(Floor.class);
         load(Get.class);
+        load(GlobalEnv.class);
         load(Gregexpr.class);
         load(GSub.class);
         load(Ifelse.class);
@@ -154,10 +155,11 @@ public class BasePackage extends RPackage {
         load(Sprintf.class);
         load(Sqrt.class);
         load(Stop.class);
+        load(Strsplit.class);
         load(Sub.class);
         load(Substr.class);
         load(Sum.class);
-        load(Strsplit.class);
+        // load(SysGetpid.class);
         load(ToLower.class);
         load(ToString.class);
         load(ToUpper.class);

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/base/GlobalEnv.java

+package com.oracle.truffle.r.nodes.builtin.base;
+
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.r.nodes.builtin.*;
+import com.oracle.truffle.r.runtime.*;
+
+@RBuiltin({"globalenv"})
+public abstract class GlobalEnv extends RBuiltinNode {
+
+    @Specialization
+    public Object globalenv() {
+        return RRuntime.GLOBAL_ENV;
+    }
+
+}

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/base/PrettyPrinterNode.java

@@ -178,6 +178,11 @@ public abstract class PrettyPrinterNode extends RNode {
         return ((RRootNode) ((DefaultCallTarget) operand.getTarget()).getRootNode()).getSourceCode();
     }
 
+    @Specialization
+    public String prettyPrint(REnvironment operand, Object listElementName) {
+        return operand.toString();
+    }
+
     private String printAttributes(VirtualFrame frame, RAbstractVector vector, Map<String, Object> attributes) {
         StringBuilder builder = new StringBuilder();
         for (Map.Entry<String, Object> attr : attributes.entrySet()) {