--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.word/src/org/graalvm/compiler/word/WordTypes.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2012, 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 org.graalvm.compiler.word;
+
+import org.graalvm.compiler.bytecode.BridgeMethodUtils;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.type.StampTool;
+import org.graalvm.compiler.word.Word.Operation;
+
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.JavaType;
+import jdk.vm.ci.meta.MetaAccessProvider;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+/**
+ * Encapsulates information for Java types representing raw words (as opposed to Objects).
+ */
+public class WordTypes {
+
+    /**
+     * Resolved type for {@link WordBase}.
+     */
+    private final ResolvedJavaType wordBaseType;
+
+    /**
+     * Resolved type for {@link Word}.
+     */
+    private final ResolvedJavaType wordImplType;
+
+    /**
+     * Resolved type for {@link ObjectAccess}.
+     */
+    private final ResolvedJavaType objectAccessType;
+
+    /**
+     * Resolved type for {@link BarrieredAccess}.
+     */
+    private final ResolvedJavaType barrieredAccessType;
+
+    private final JavaKind wordKind;
+
+    public WordTypes(MetaAccessProvider metaAccess, JavaKind wordKind) {
+        this.wordKind = wordKind;
+        this.wordBaseType = metaAccess.lookupJavaType(WordBase.class);
+        this.wordImplType = metaAccess.lookupJavaType(Word.class);
+        this.objectAccessType = metaAccess.lookupJavaType(ObjectAccess.class);
+        this.barrieredAccessType = metaAccess.lookupJavaType(BarrieredAccess.class);
+    }
+
+    /**
+     * Determines if a given method denotes a word operation.
+     */
+    public boolean isWordOperation(ResolvedJavaMethod targetMethod) {
+        final boolean isObjectAccess = objectAccessType.equals(targetMethod.getDeclaringClass());
+        final boolean isBarrieredAccess = barrieredAccessType.equals(targetMethod.getDeclaringClass());
+        if (isObjectAccess || isBarrieredAccess) {
+            assert targetMethod.getAnnotation(Operation.class) != null : targetMethod + " should be annotated with @" + Operation.class.getSimpleName();
+            return true;
+        }
+        return isWord(targetMethod.getDeclaringClass());
+    }
+
+    /**
+     * Gets the method annotated with {@link Operation} based on a given method that represents a
+     * word operation (but may not necessarily have the annotation).
+     *
+     * @param callingContextType the {@linkplain ResolvedJavaType type} from which
+     *            {@code targetMethod} is invoked
+     * @return the {@link Operation} method resolved for {@code targetMethod} if any
+     */
+    public ResolvedJavaMethod getWordOperation(ResolvedJavaMethod targetMethod, ResolvedJavaType callingContextType) {
+        final boolean isWordBase = wordBaseType.isAssignableFrom(targetMethod.getDeclaringClass());
+        ResolvedJavaMethod wordMethod = targetMethod;
+        if (isWordBase && !targetMethod.isStatic()) {
+            assert wordImplType.isLinked();
+            wordMethod = wordImplType.resolveConcreteMethod(targetMethod, callingContextType);
+        }
+        assert wordMethod != null : targetMethod;
+        assert BridgeMethodUtils.getAnnotation(Operation.class, wordMethod) != null;
+        return wordMethod;
+    }
+
+    /**
+     * Determines if a given node has a word type.
+     */
+    public boolean isWord(ValueNode node) {
+        return isWord(StampTool.typeOrNull(node));
+    }
+
+    /**
+     * Determines if a given type is a word type.
+     */
+    public boolean isWord(JavaType type) {
+        return type instanceof ResolvedJavaType && wordBaseType.isAssignableFrom((ResolvedJavaType) type);
+    }
+
+    /**
+     * Gets the kind for a given type, returning the {@linkplain #getWordKind() word kind} if
+     * {@code type} is a {@linkplain #isWord(JavaType) word type}.
+     */
+    public JavaKind asKind(JavaType type) {
+        if (isWord(type)) {
+            return wordKind;
+        } else {
+            return type.getJavaKind();
+        }
+    }
+
+    public JavaKind getWordKind() {
+        return wordKind;
+    }
+
+    /**
+     * Gets the stamp for a given {@linkplain #isWord(JavaType) word type}.
+     */
+    public Stamp getWordStamp(ResolvedJavaType type) {
+        assert isWord(type);
+        return StampFactory.forKind(wordKind);
+    }
+
+    public ResolvedJavaType getWordImplType() {
+        return wordImplType;
+    }
+}