--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleOptions.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2012, 2012, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.api;
+
+import java.security.*;
+
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Class containing general Truffle options.
+ */
+public class TruffleOptions {
+
+    /**
+     * Force truffle to run in interpreter mode.
+     * <p>
+     * Can be set with {@code -Dtruffle.ForceInterpreter=true}.
+     */
+    public static final boolean ForceInterpreter = Boolean.getBoolean("truffle.ForceInterpreter");
+
+    /**
+     * Enables/disables the rewriting of traces in the Truffle runtime to stdout.
+     * <p>
+     * Can be set with {@code -Dtruffle.TraceRewrites=true}.
+     */
+    public static final boolean TraceRewrites;
+
+    /**
+     * Enables the generation of detailed rewrite reasons. Enabling this may introduce some overhead
+     * for rewriting nodes.
+     * <p>
+     * Can be set with {@code -Dtruffle.DetailedRewriteReasons=true}.
+     */
+    public static final boolean DetailedRewriteReasons;
+
+    /**
+     * Filters rewrites that do not contain the given string in the qualified name of the source or
+     * target class hierarchy.
+     * <p>
+     * Can be set with {@code -Dtruffle.TraceRewritesFilterClass=name}.
+     */
+    public static String TraceRewritesFilterClass;
+
+    /**
+     * Filters rewrites which does not contain the {@link NodeCost} in its source {@link NodeInfo}.
+     * If no {@link NodeInfo} is defined the element is filtered if the filter value is set.
+     * <p>
+     * Can be set with
+     * {@code -Dtruffle.TraceRewritesFilterFromCost=NONE|MONOMORPHIC|POLYMORPHIC|MEGAMORPHIC}.
+     */
+    public static NodeCost TraceRewritesFilterFromCost;
+
+    /**
+     * Filters rewrites which does not contain the {@link NodeCost} in its target {@link NodeInfo}.
+     * If no {@link NodeInfo} is defined the element is filtered if the filter value is set.
+     * <p>
+     * Can be set with
+     * {@code -Dtruffle.TraceRewritesFilterToKind=UNINITIALIZED|SPECIALIZED|POLYMORPHIC|GENERIC}.
+     */
+    public static NodeCost TraceRewritesFilterToCost;
+
+    /**
+     * Enables the dumping of Node creations and AST rewrites in JSON format.
+     * <p>
+     * Can be set with {@code -Dtruffle.TraceASTJSON=true}.
+     */
+    public static final boolean TraceASTJSON;
+
+    private static NodeCost parseNodeInfoKind(String kind) {
+        if (kind == null) {
+            return null;
+        }
+
+        return NodeCost.valueOf(kind);
+    }
+
+    static {
+        final boolean[] values = new boolean[3];
+        AccessController.doPrivileged(new PrivilegedAction<Void>() {
+            public Void run() {
+                values[0] = Boolean.getBoolean("truffle.TraceRewrites");
+                TraceRewritesFilterClass = System.getProperty("truffle.TraceRewritesFilterClass");
+                TraceRewritesFilterFromCost = parseNodeInfoKind(System.getProperty("truffle.TraceRewritesFilterFromCost"));
+                TraceRewritesFilterToCost = parseNodeInfoKind(System.getProperty("truffle.TraceRewritesFilterToCost"));
+                values[1] = Boolean.getBoolean("truffle.DetailedRewriteReasons");
+                values[2] = Boolean.getBoolean("truffle.TraceASTJSON");
+                return null;
+            }
+        });
+        TraceRewrites = values[0];
+        DetailedRewriteReasons = values[1];
+        TraceASTJSON = values[2];
+    }
+}