--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.code/src/org/graalvm/compiler/code/SourceMapping.java	2016-12-07 13:47:43.005766167 -0800
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2016, 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 org.graalvm.compiler.code;
+
+import static jdk.vm.ci.meta.MetaUtil.identityHashCodeString;
+
+import org.graalvm.compiler.graph.NodeSourcePosition;
+
+/**
+ * This provides a mapping between a half-open range of PCs in the generated code and a
+ * {@link NodeSourcePosition} in the original program. Depending on the backend this information may
+ * be represented in different ways or not at all.
+ */
+public final class SourceMapping {
+
+    private final int startOffset;
+
+    private final int endOffset;
+
+    private final NodeSourcePosition sourcePosition;
+
+    public SourceMapping(int startOffset, int endOffset, NodeSourcePosition sourcePosition) {
+        this.startOffset = startOffset;
+        this.endOffset = endOffset;
+        this.sourcePosition = sourcePosition;
+    }
+
+    public int getStartOffset() {
+        return startOffset;
+    }
+
+    public int getEndOffset() {
+        return endOffset;
+    }
+
+    public NodeSourcePosition getSourcePosition() {
+        return sourcePosition;
+    }
+
+    @Override
+    public String toString() {
+        return identityHashCodeString(this);
+    }
+
+    @Override
+    public int hashCode() {
+        throw new UnsupportedOperationException("hashCode");
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof SourceMapping) {
+            SourceMapping other = (SourceMapping) obj;
+            return other.startOffset == startOffset && other.endOffset == endOffset && other.sourcePosition.equals(sourcePosition);
+        }
+        return false;
+    }
+
+    public boolean contains(int offset) {
+        return startOffset <= offset && offset < endOffset;
+    }
+
+}