--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/impl/DefaultVisualizer.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2014, 2015, 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.instrument.impl;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.instrument.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.source.*;
+
+public class DefaultVisualizer implements Visualizer {
+
+    private final ASTPrinter astPrinter;
+
+    public DefaultVisualizer() {
+        this.astPrinter = new DefaultASTPrinter();
+    }
+
+    public ASTPrinter getASTPrinter() {
+        return astPrinter;
+    }
+
+    public String displaySourceLocation(Node node) {
+        if (node == null) {
+            return "<unknown>";
+        }
+        SourceSection section = node.getSourceSection();
+        boolean estimated = false;
+        if (section == null) {
+            section = node.getEncapsulatingSourceSection();
+            estimated = true;
+        }
+        if (section == null) {
+            return "<error: source location>";
+        }
+        return section.getShortDescription() + (estimated ? "~" : "");
+    }
+
+    public String displayMethodName(Node node) {
+        if (node == null) {
+            return null;
+        }
+        RootNode root = node.getRootNode();
+        if (root == null) {
+            return "unknown";
+        }
+        return root.getCallTarget().toString();
+    }
+
+    public String displayCallTargetName(CallTarget callTarget) {
+        return callTarget.toString();
+    }
+
+    public String displayValue(Object value, int trim) {
+        return trim(value.toString(), trim);
+    }
+
+    public String displayIdentifier(FrameSlot slot) {
+        return slot.getIdentifier().toString();
+    }
+
+    /**
+     * Trims text if {@code trim > 0} to the shorter of {@code trim} or the length of the first line
+     * of test. Identity if {@code trim <= 0}.
+     */
+    protected String trim(String text, int trim) {
+        if (trim == 0) {
+            return text;
+        }
+        final String[] lines = text.split("\n");
+        String result = lines[0];
+        if (lines.length == 1) {
+            if (result.length() <= trim) {
+                return result;
+            }
+            if (trim <= 3) {
+                return result.substring(0, Math.min(result.length() - 1, trim - 1));
+            } else {
+                return result.substring(0, trim - 4) + "...";
+            }
+        }
+        return (result.length() < trim - 3 ? result : result.substring(0, trim - 4)) + "...";
+    }
+}