--- /dev/null	2019-12-04 18:44:18.020007537 +0000
+++ new/src/jdk.incubator.foreign/share/classes/jdk/incubator/foreign/ValueLayout.java	2019-12-09 18:15:35.140094014 +0000
@@ -0,0 +1,140 @@
+/*
+ *  Copyright (c) 2019, 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 jdk.incubator.foreign;
+
+import java.lang.constant.ConstantDescs;
+import java.lang.constant.DynamicConstantDesc;
+import java.lang.constant.MethodHandleDesc;
+import java.nio.ByteOrder;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.OptionalLong;
+
+/**
+ * A value layout. A value layout is used to model the memory layout associated with values of basic data types, such as <em>integral</em> types
+ * (either signed or unsigned) and <em>floating-point</em> types. Each value layout has a size and a byte order (see {@link ByteOrder}).
+ *
+ * <p>
+ * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
+ * class; use of identity-sensitive operations (including reference equality
+ * ({@code ==}), identity hash code, or synchronization) on instances of
+ * {@code ValueLayout} may have unpredictable results and should be avoided.
+ * The {@code equals} method should be used for comparisons.
+ *
+ * @implSpec
+ * This class is immutable and thread-safe.
+ */
+public final class ValueLayout extends AbstractLayout implements MemoryLayout {
+
+    private final ByteOrder order;
+
+    ValueLayout(ByteOrder order, long size) {
+        this(order, size, size, Optional.empty());
+    }
+
+    ValueLayout(ByteOrder order, long size, long alignment, Optional<String> name) {
+        super(OptionalLong.of(size), alignment, name);
+        this.order = order;
+    }
+
+    /**
+     * Returns the value's byte order.
+     *
+     * @return the value's  byte order.
+     */
+    public ByteOrder order() {
+        return order;
+    }
+
+    /**
+     * Returns a new value layout with given byte order.
+     *
+     * @param order the desired byte order.
+     * @return a new value layout with given byte order.
+     */
+    public ValueLayout withOrder(ByteOrder order) {
+        return new ValueLayout(order, bitSize(), alignment, optName());
+    }
+
+    @Override
+    public String toString() {
+        return decorateLayoutString(String.format("%s%d",
+                order == ByteOrder.BIG_ENDIAN ? "B" : "b",
+                bitSize()));
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+        if (!super.equals(other)) {
+            return false;
+        }
+        if (!(other instanceof ValueLayout)) {
+            return false;
+        }
+        ValueLayout v = (ValueLayout)other;
+        return order.equals(v.order) &&
+            bitSize() == v.bitSize() &&
+            alignment == v.alignment;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), order, bitSize(), alignment);
+    }
+
+    @Override
+    ValueLayout dup(long alignment, Optional<String> name) {
+        return new ValueLayout(order, bitSize(), alignment, name);
+    }
+
+    @Override
+    public Optional<DynamicConstantDesc<ValueLayout>> describeConstable() {
+        return Optional.of(DynamicConstantDesc.ofNamed(ConstantDescs.BSM_INVOKE, "value",
+                CD_VALUE_LAYOUT, MH_VALUE, bitSize(), order == ByteOrder.BIG_ENDIAN ? BIG_ENDIAN : LITTLE_ENDIAN));
+    }
+
+    //hack: the declarations below are to make javadoc happy; we could have used generics in AbstractLayout
+    //but that causes issues with javadoc, see JDK-8224052
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public ValueLayout withName(String name) {
+        return (ValueLayout)super.withName(name);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public ValueLayout withBitAlignment(long alignmentBits) {
+        return (ValueLayout)super.withBitAlignment(alignmentBits);
+    }
+}