--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.code/src/jdk/vm/ci/code/DebugInfo.java	Thu Oct 08 12:49:30 2015 -1000
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2009, 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.
+ *
+ * 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 jdk.vm.ci.code;
+
+import java.util.*;
+
+/**
+ * Represents the debugging information for a particular point of execution. This information
+ * includes:
+ * <ul>
+ * <li>a {@linkplain #getBytecodePosition() bytecode position}</li>
+ * <li>a reference map for registers and stack slots in the current frame</li>
+ * <li>a map from bytecode locals and operand stack slots to their values or locations from which
+ * their values can be read</li>
+ * <li>a map from the registers (in the caller's frame) to the slots where they are saved in the
+ * current frame</li>
+ * </ul>
+ */
+public final class DebugInfo {
+
+    private final BytecodePosition bytecodePosition;
+    private ReferenceMap referenceMap;
+    @SuppressWarnings("unused") private final VirtualObject[] virtualObjectMapping;
+    private RegisterSaveLayout calleeSaveInfo;
+
+    /**
+     * Creates a new {@link DebugInfo} from the given values.
+     *
+     * @param codePos the {@linkplain BytecodePosition code position} or {@linkplain BytecodeFrame
+     *            frame} info
+     * @param virtualObjectMapping the mapping of {@link VirtualObject}s to their real values
+     */
+    public DebugInfo(BytecodePosition codePos, VirtualObject[] virtualObjectMapping) {
+        this.bytecodePosition = codePos;
+        this.virtualObjectMapping = virtualObjectMapping;
+    }
+
+    public DebugInfo(BytecodePosition codePos) {
+        this(codePos, null);
+    }
+
+    public void setReferenceMap(ReferenceMap referenceMap) {
+        this.referenceMap = referenceMap;
+    }
+
+    /**
+     * @return {@code true} if this debug information has a frame
+     */
+    public boolean hasFrame() {
+        return getBytecodePosition() instanceof BytecodeFrame;
+    }
+
+    /**
+     * Gets the deoptimization information for each inlined frame (if available).
+     *
+     * @return {@code null} if no frame de-opt info is {@linkplain #hasFrame() available}
+     */
+    public BytecodeFrame frame() {
+        if (hasFrame()) {
+            return (BytecodeFrame) getBytecodePosition();
+        }
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return CodeUtil.append(new StringBuilder(100), this, null).toString();
+    }
+
+    /**
+     * @return The code position (including all inlined methods) of this debug info. If this is a
+     *         {@link BytecodeFrame} instance, then it is also the deoptimization information for
+     *         each inlined frame.
+     */
+    public BytecodePosition getBytecodePosition() {
+        return bytecodePosition;
+    }
+
+    public ReferenceMap getReferenceMap() {
+        return referenceMap;
+    }
+
+    /**
+     * Sets the map from the registers (in the caller's frame) to the slots where they are saved in
+     * the current frame.
+     */
+    public void setCalleeSaveInfo(RegisterSaveLayout calleeSaveInfo) {
+        this.calleeSaveInfo = calleeSaveInfo;
+    }
+
+    /**
+     * Gets the map from the registers (in the caller's frame) to the slots where they are saved in
+     * the current frame. If no such information is available, {@code null} is returned.
+     */
+    public RegisterSaveLayout getCalleeSaveInfo() {
+        return calleeSaveInfo;
+    }
+
+    @Override
+    public int hashCode() {
+        throw new UnsupportedOperationException("hashCode");
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DebugInfo) {
+            DebugInfo that = (DebugInfo) obj;
+            if (Objects.equals(this.bytecodePosition, that.bytecodePosition) && Objects.equals(this.calleeSaveInfo, that.calleeSaveInfo) && Objects.equals(this.referenceMap, that.referenceMap)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}