--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerAsserts.java	Tue Apr 23 11:20:53 2013 +0200
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2013, 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.truffle.api;
+
+/**
+ * Assertions about the code produced by the Truffle compiler. All operations have no effect when
+ * either executed in the interpreter or in the compiled code. The assertions are checked during
+ * code generation and the Truffle compiler produces for failing assertions a stack trace that
+ * identifies the code position of the assertion in the context of the current compilation.
+ * 
+ */
+public class CompilerAsserts {
+
+    /**
+     * Assertion that this code position should never be reached during compilation. It can be used
+     * for exceptional code paths or rare code paths that should never be included in a compilation
+     * unit. See {@link CompilerDirectives#transferToInterpreter()} for the corresponding compiler
+     * directive.
+     */
+    public static void neverPartOfCompilation() {
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static boolean compilationConstant(boolean value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static byte compilationConstant(byte value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static char compilationConstant(char value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static short compilationConstant(short value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static int compilationConstant(int value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static long compilationConstant(long value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static float compilationConstant(float value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static double compilationConstant(double value) {
+        return value;
+    }
+
+    /**
+     * Assertion that the corresponding value is reduced to a constant during compilation.
+     * 
+     * @param value the value that must be constant during compilation
+     * @return the value given as parameter
+     */
+    public static Object compilationConstant(Object value) {
+        return value;
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java	Tue Apr 23 11:20:53 2013 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2013, 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.truffle.api;
+
+import java.util.concurrent.*;
+
+/**
+ * Directives that influence the optimizations of the Truffle compiler. All of the operations have
+ * no effect when executed in the Truffle interpreter.
+ */
+public class CompilerDirectives {
+
+    private static final double SLOWPATH_PROBABILITY = 0.0001;
+
+    /**
+     * Directive for the compiler to discontinue compilation at this code position and instead
+     * insert a transfer to the interpreter.
+     */
+    public static void transferToInterpreter() {
+    }
+
+    /**
+     * Directive for the compiler that the given runnable should only be executed in the interpreter
+     * and ignored in the compiled code.
+     * 
+     * @param runnable the closure that should only be executed in the interpreter
+     */
+    public static void interpreterOnly(Runnable runnable) {
+        runnable.run();
+    }
+
+    /**
+     * Directive for the compiler that the given callable should only be executed in the
+     * interpreter.
+     * 
+     * @param callable the closure that should only be executed in the interpreter
+     * @return the result of executing the closure in the interpreter and null in the compiled code
+     * @throws Exception If the closure throws an exception when executed in the interpreter.
+     */
+    public static <T> T interpreterOnly(Callable<T> callable) throws Exception {
+        return callable.call();
+    }
+
+    /**
+     * Directive for the compiler that the current path has a very low probability to be executed.
+     */
+    public static void slowpath() {
+        injectBranchProbability(SLOWPATH_PROBABILITY);
+    }
+
+    /**
+     * Injects a probability for the current path into the probability information of the
+     * immediately preceeding branch instruction.
+     * 
+     * @param probability the probability value between 0.0 and 1.0 that should be injected
+     */
+    public static void injectBranchProbability(double probability) {
+        assert probability >= 0.0 && probability <= 1.0;
+    }
+}