--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLStackTraceBuiltin.java	Fri Apr 11 11:53:11 2014 +0200
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2012, 2014, 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.sl.builtins;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.CompilerDirectives.SlowPath;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.frame.FrameInstance.FrameAccess;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Returns a string representation of the current stack. This includes the {@link CallTarget}s and
+ * the contents of the {@link Frame}. Note that this is implemented as a slow path by passing
+ * {@code true} to {@link FrameInstance#getFrame(FrameAccess, boolean)}.
+ */
+@NodeInfo(shortName = "stacktrace")
+public abstract class SLStackTraceBuiltin extends SLBuiltinNode {
+
+    @Specialization
+    public String trace() {
+        return createStackTrace();
+    }
+
+    @SlowPath
+    private static String createStackTrace() {
+        StringBuilder str = new StringBuilder();
+        for (FrameInstance frame : Truffle.getRuntime().getStackTrace()) {
+            dumpFrame(str, frame.getCallNode().getRootNode(), frame.getFrame(FrameAccess.READ_ONLY, true), frame.isVirtualFrame());
+        }
+        return str.toString();
+    }
+
+    private static void dumpFrame(StringBuilder str, RootNode rootNode, Frame frame, boolean isVirtual) {
+        if (str.length() > 0) {
+            str.append("\n");
+        }
+        str.append("Frame: ").append(rootNode).append(isVirtual ? " (virtual)" : "");
+        FrameDescriptor frameDescriptor = frame.getFrameDescriptor();
+        for (FrameSlot s : frameDescriptor.getSlots()) {
+            str.append(", ").append(s.getIdentifier()).append("=").append(frame.getValue(s));
+        }
+    }
+}