--- /dev/null	2015-10-08 07:25:18.000000000 -1000
+++ new/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMethodDataAccessor.java	2015-10-08 07:25:18.000000000 -1000
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 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 jdk.vm.ci.hotspot;
+
+import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.*;
+
+import jdk.vm.ci.meta.*;
+
+/**
+ * Interface for accessor objects that encapsulate the logic for accessing the different kinds of
+ * data in a HotSpot methodDataOop. This interface is similar to the interface {@link ProfilingInfo}
+ * , but most methods require a MethodDataObject and the exact position within the methodData.
+ */
+public interface HotSpotMethodDataAccessor {
+
+    /**
+     * {@code DataLayout} tag values.
+     */
+    enum Tag {
+        No(config().dataLayoutNoTag),
+        BitData(config().dataLayoutBitDataTag),
+        CounterData(config().dataLayoutCounterDataTag),
+        JumpData(config().dataLayoutJumpDataTag),
+        ReceiverTypeData(config().dataLayoutReceiverTypeDataTag),
+        VirtualCallData(config().dataLayoutVirtualCallDataTag),
+        RetData(config().dataLayoutRetDataTag),
+        BranchData(config().dataLayoutBranchDataTag),
+        MultiBranchData(config().dataLayoutMultiBranchDataTag),
+        ArgInfoData(config().dataLayoutArgInfoDataTag),
+        CallTypeData(config().dataLayoutCallTypeDataTag),
+        VirtualCallTypeData(config().dataLayoutVirtualCallTypeDataTag),
+        ParametersTypeData(config().dataLayoutParametersTypeDataTag),
+        SpeculativeTrapData(config().dataLayoutSpeculativeTrapDataTag);
+
+        private final int value;
+
+        private Tag(int value) {
+            this.value = value;
+        }
+
+        public int getValue() {
+            return value;
+        }
+
+        private static HotSpotVMConfig config() {
+            return runtime().getConfig();
+        }
+
+        public static Tag getEnum(int value) {
+            Tag result = values()[value];
+            assert value == result.value;
+            return result;
+        }
+    }
+
+    /**
+     * Returns the {@link Tag} stored in the LayoutData header.
+     *
+     * @return tag stored in the LayoutData header
+     */
+    Tag getTag();
+
+    /**
+     * Returns the BCI stored in the LayoutData header.
+     *
+     * @return An integer ≥ 0 and ≤ Short.MAX_VALUE, or -1 if not supported.
+     */
+    int getBCI(HotSpotMethodData data, int position);
+
+    /**
+     * Computes the size for the specific data at the given position.
+     *
+     * @return An integer > 0.
+     */
+    int getSize(HotSpotMethodData data, int position);
+
+    JavaTypeProfile getTypeProfile(HotSpotMethodData data, int position);
+
+    JavaMethodProfile getMethodProfile(HotSpotMethodData data, int position);
+
+    double getBranchTakenProbability(HotSpotMethodData data, int position);
+
+    double[] getSwitchProbabilities(HotSpotMethodData data, int position);
+
+    TriState getExceptionSeen(HotSpotMethodData data, int position);
+
+    TriState getNullSeen(HotSpotMethodData data, int position);
+
+    int getExecutionCount(HotSpotMethodData data, int position);
+
+    StringBuilder appendTo(StringBuilder sb, HotSpotMethodData data, int pos);
+}