--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/BytecodePosition.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2009, 2011, 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.jvmci.code;
+
+import com.oracle.jvmci.meta.ResolvedJavaMethod;
+import java.util.*;
+
+
+/**
+ * Represents a code position, that is, a chain of inlined methods with bytecode locations, that is
+ * communicated from the compiler to the runtime system. A code position can be used by the runtime
+ * system to reconstruct a source-level stack trace for exceptions and to create
+ * {@linkplain BytecodeFrame frames} for deoptimization.
+ */
+public class BytecodePosition {
+
+    private final BytecodePosition caller;
+    private final ResolvedJavaMethod method;
+    private final int bci;
+
+    /**
+     * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
+     *
+     * @param caller the parent position
+     * @param method the method
+     * @param bci a BCI within the method
+     */
+    public BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) {
+        assert method != null;
+        this.caller = caller;
+        this.method = method;
+        this.bci = bci;
+    }
+
+    /**
+     * Converts this code position to a string representation.
+     *
+     * @return a string representation of this code position
+     */
+    @Override
+    public String toString() {
+        return CodeUtil.append(new StringBuilder(100), this).toString();
+    }
+
+    /**
+     * Deep equality test.
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (obj != null && getClass() == obj.getClass()) {
+            BytecodePosition that = (BytecodePosition) obj;
+            if (this.bci == that.bci && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.caller, that.caller)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return getBCI();
+    }
+
+    /**
+     * @return The location within the method, as a bytecode index. The constant {@code -1} may be
+     *         used to indicate the location is unknown, for example within code synthesized by the
+     *         compiler.
+     */
+    public int getBCI() {
+        return bci;
+    }
+
+    /**
+     * @return The runtime interface method for this position.
+     */
+    public ResolvedJavaMethod getMethod() {
+        return method;
+    }
+
+    /**
+     * The position where this position has been called, {@code null} if none.
+     */
+    public BytecodePosition getCaller() {
+        return caller;
+    }
+
+    /**
+     * Adds a caller to the current position returning the new position.
+     */
+    public BytecodePosition addCaller(BytecodePosition link) {
+        if (getCaller() == null) {
+            return new BytecodePosition(link, getMethod(), getBCI());
+        } else {
+            return new BytecodePosition(getCaller().addCaller(link), getMethod(), getBCI());
+        }
+    }
+}