--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.dsl/src/com/oracle/truffle/api/dsl/internal/SlowPathEvent.java	Tue Mar 10 19:28:26 2015 +0100
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 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.  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.dsl.internal;
+
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Lazy rewrite event that implements {@link CharSequence} to be provided as message in
+ * {@link Node#replace(Node, CharSequence)}.
+ */
+abstract class SlowPathEvent implements CharSequence {
+
+    protected final SpecializationNode source;
+    protected final String reason;
+    protected final Frame frame;
+    private String message;
+
+    SlowPathEvent(SpecializationNode source, String reason, Frame frame) {
+        this.source = source;
+        this.reason = reason;
+        this.frame = frame;
+    }
+
+    public int length() {
+        return getMessage().length();
+    }
+
+    public char charAt(int index) {
+        return getMessage().charAt(index);
+    }
+
+    public CharSequence subSequence(int start, int end) {
+        return getMessage().subSequence(start, end);
+    }
+
+    @Override
+    public String toString() {
+        return getMessage();
+    }
+
+    private String getMessage() {
+        if (message == null) {
+            message = createMessage();
+        }
+        return message;
+    }
+
+    private String createMessage() {
+        StringBuilder builder = new StringBuilder();
+        builder.append(source);
+        builder.append(" ");
+        builder.append(reason);
+        Object[] values = getValues();
+        if (values.length > 0) {
+            builder.append(" with parameters (");
+            String sep = "";
+            for (Object value : values) {
+                builder.append(sep);
+                if (value == null) {
+                    builder.append("null");
+                } else {
+                    builder.append(value).append(" (").append(value.getClass().getSimpleName()).append(")");
+                }
+
+                sep = ", ";
+            }
+            builder.append(")");
+        }
+        return builder.toString();
+    }
+
+    public abstract Object[] getValues();
+
+    static class SlowPathEvent0 extends SlowPathEvent {
+
+        private static final Object[] EMPTY = new Object[0];
+
+        public SlowPathEvent0(SpecializationNode source, String reason, Frame frame) {
+            super(source, reason, frame);
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return EMPTY;
+        }
+
+    }
+
+    static class SlowPathEvent1 extends SlowPathEvent {
+
+        protected final Object o1;
+
+        public SlowPathEvent1(SpecializationNode source, String reason, Frame frame, Object o1) {
+            super(source, reason, frame);
+            this.o1 = o1;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return new Object[]{o1};
+        }
+
+    }
+
+    static class SlowPathEvent2 extends SlowPathEvent {
+
+        protected final Object o1;
+        protected final Object o2;
+
+        public SlowPathEvent2(SpecializationNode source, String reason, Frame frame, Object o1, Object o2) {
+            super(source, reason, frame);
+            this.o1 = o1;
+            this.o2 = o2;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return new Object[]{o1, o2};
+        }
+
+    }
+
+    static class SlowPathEvent3 extends SlowPathEvent {
+
+        protected final Object o1;
+        protected final Object o2;
+        protected final Object o3;
+
+        public SlowPathEvent3(SpecializationNode source, String reason, Frame frame, Object o1, Object o2, Object o3) {
+            super(source, reason, frame);
+            this.o1 = o1;
+            this.o2 = o2;
+            this.o3 = o3;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return new Object[]{o1, o2, o3};
+        }
+
+    }
+
+    static class SlowPathEvent4 extends SlowPathEvent {
+
+        protected final Object o1;
+        protected final Object o2;
+        protected final Object o3;
+        protected final Object o4;
+
+        public SlowPathEvent4(SpecializationNode source, String reason, Frame frame, Object o1, Object o2, Object o3, Object o4) {
+            super(source, reason, frame);
+            this.o1 = o1;
+            this.o2 = o2;
+            this.o3 = o3;
+            this.o4 = o4;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return new Object[]{o1, o2, o3, o4};
+        }
+
+    }
+
+    static class SlowPathEvent5 extends SlowPathEvent {
+
+        protected final Object o1;
+        protected final Object o2;
+        protected final Object o3;
+        protected final Object o4;
+        protected final Object o5;
+
+        public SlowPathEvent5(SpecializationNode source, String reason, Frame frame, Object o1, Object o2, Object o3, Object o4, Object o5) {
+            super(source, reason, frame);
+            this.o1 = o1;
+            this.o2 = o2;
+            this.o3 = o3;
+            this.o4 = o4;
+            this.o5 = o5;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return new Object[]{o1, o2, o3, o4, o5};
+        }
+
+    }
+
+    static class SlowPathEventN extends SlowPathEvent {
+
+        protected final Object[] args;
+
+        public SlowPathEventN(SpecializationNode source, String reason, Frame frame, Object... args) {
+            super(source, reason, frame);
+            this.args = args;
+        }
+
+        @Override
+        public final Object[] getValues() {
+            return args;
+        }
+
+    }
+}