--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.cri/src/com/oracle/max/cri/xir/XirSite.java	Tue Jan 03 16:29:28 2012 +0100
@@ -0,0 +1,94 @@
+/*
+ * 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.max.cri.xir;
+
+import com.oracle.max.cri.ci.*;
+import com.oracle.max.cri.ri.*;
+
+/**
+ * Encapsulates the notion of a site where XIR can be supplied. It is supplied to the {@link RiXirGenerator} by the
+ * compiler for each place where XIR can be generated. This interface allows a number of queries, including the
+ * bytecode-level location and optimization hints computed by the compiler.
+ */
+public interface XirSite {
+
+    /**
+     * Gets the {@link CiCodePos code position} associated with this site. This is useful for inserting
+     * instrumentation at the XIR level.
+     * @return the code position if it is available; {@code null} otherwise
+     */
+    CiCodePos getCodePos();
+
+    /**
+     * Checks whether the specified argument is guaranteed to be non-null at this site.
+     * @param argument the argument
+     * @return {@code true} if the argument is non null at this site
+     */
+    boolean isNonNull(XirArgument argument);
+
+    /**
+     * Checks whether this site requires a null check.
+     * @return {@code true} if a null check is required
+     */
+    boolean requiresNullCheck();
+
+    /**
+     * Checks whether this site requires a range check.
+     * @return {@code true} if a range check is required
+     */
+    boolean requiresBoundsCheck();
+
+    /**
+     * Checks whether this site requires a read barrier.
+     * @return {@code true} if a read barrier is required
+     */
+    boolean requiresReadBarrier();
+
+    /**
+     * Checks whether this site requires a write barrier.
+     * @return {@code true} if a write barrier is required
+     */
+    boolean requiresWriteBarrier();
+
+    /**
+     * Checks whether this site requires an array store check.
+     * @return {@code true} if an array store check is required
+     */
+    boolean requiresArrayStoreCheck();
+
+    /**
+     * Checks whether an approximation of the type for the specified argument is available.
+     * @param argument the argument
+     * @return an {@link RiType} indicating the most specific type known for the argument, if any;
+     * {@code null} if no particular type is known
+     */
+    RiType getApproximateType(XirArgument argument);
+
+    /**
+     * Checks whether an exact type is known for the specified argument.
+     * @param argument the argument
+     * @return an {@link RiType} indicating the exact type known for the argument, if any;
+     * {@code null} if no particular type is known
+     */
+    RiType getExactType(XirArgument argument);
+}