--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/ValueUtil.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,190 @@
+/*
+ * Copyright (c) 2012, 2014, 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.jvmci.code;
+
+import com.oracle.jvmci.meta.Kind;
+import com.oracle.jvmci.meta.Value;
+import com.oracle.jvmci.meta.AllocatableValue;
+import com.oracle.jvmci.meta.JavaConstant;
+import java.util.*;
+
+
+/**
+ * Utility class for working with the {@link Value} class and its subclasses.
+ */
+public final class ValueUtil {
+
+    public static boolean isIllegal(Value value) {
+        assert value != null;
+        return Value.ILLEGAL.equals(value);
+    }
+
+    public static boolean isLegal(Value value) {
+        return !isIllegal(value);
+    }
+
+    public static boolean isVirtualObject(Value value) {
+        assert value != null;
+        return value instanceof VirtualObject;
+    }
+
+    public static VirtualObject asVirtualObject(Value value) {
+        assert value != null;
+        return (VirtualObject) value;
+    }
+
+    public static boolean isConstant(Value value) {
+        assert value != null;
+        return value instanceof JavaConstant;
+    }
+
+    public static JavaConstant asConstant(Value value) {
+        assert value != null;
+        return (JavaConstant) value;
+    }
+
+    public static boolean isAllocatableValue(Value value) {
+        assert value != null;
+        return value instanceof AllocatableValue;
+    }
+
+    public static AllocatableValue asAllocatableValue(Value value) {
+        assert value != null;
+        return (AllocatableValue) value;
+    }
+
+    public static boolean isStackSlot(Value value) {
+        assert value != null;
+        return value instanceof StackSlot;
+    }
+
+    public static StackSlot asStackSlot(Value value) {
+        assert value != null;
+        return (StackSlot) value;
+    }
+
+    public static boolean isStackSlotValue(Value value) {
+        assert value != null;
+        return value instanceof StackSlotValue;
+    }
+
+    public static StackSlotValue asStackSlotValue(Value value) {
+        assert value != null;
+        return (StackSlotValue) value;
+    }
+
+    public static boolean isVirtualStackSlot(Value value) {
+        assert value != null;
+        return value instanceof VirtualStackSlot;
+    }
+
+    public static VirtualStackSlot asVirtualStackSlot(Value value) {
+        assert value != null;
+        return (VirtualStackSlot) value;
+    }
+
+    public static boolean isRegister(Value value) {
+        assert value != null;
+        return value instanceof RegisterValue;
+    }
+
+    public static Register asRegister(Value value) {
+        assert value != null;
+        return ((RegisterValue) value).getRegister();
+    }
+
+    public static Register asIntReg(Value value) {
+        if (value.getKind().getStackKind() != Kind.Int) {
+            throw new InternalError("needed Int got: " + value.getKind());
+        } else {
+            return asRegister(value);
+        }
+    }
+
+    public static Register asLongReg(Value value) {
+        if (value.getKind() != Kind.Long) {
+            throw new InternalError("needed Long got: " + value.getKind());
+        } else {
+            return asRegister(value);
+        }
+    }
+
+    public static Register asObjectReg(Value value) {
+        assert value.getKind() == Kind.Object : value.getKind();
+        return asRegister(value);
+    }
+
+    public static Register asFloatReg(Value value) {
+        assert value.getKind() == Kind.Float : value.getKind();
+        return asRegister(value);
+    }
+
+    public static Register asDoubleReg(Value value) {
+        assert value.getKind() == Kind.Double : value.getKind();
+        return asRegister(value);
+    }
+
+    public static boolean sameRegister(Value v1, Value v2) {
+        return isRegister(v1) && isRegister(v2) && asRegister(v1).equals(asRegister(v2));
+    }
+
+    public static boolean sameRegister(Value v1, Value v2, Value v3) {
+        return sameRegister(v1, v2) && sameRegister(v1, v3);
+    }
+
+    /**
+     * Checks if all the provided values are different physical registers. The parameters can be
+     * either {@link Register registers}, {@link Value values} or arrays of them. All values that
+     * are not {@link RegisterValue registers} are ignored.
+     */
+    public static boolean differentRegisters(Object... values) {
+        List<Register> registers = collectRegisters(values, new ArrayList<Register>());
+        for (int i = 1; i < registers.size(); i++) {
+            Register r1 = registers.get(i);
+            for (int j = 0; j < i; j++) {
+                Register r2 = registers.get(j);
+                if (r1.equals(r2)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private static List<Register> collectRegisters(Object[] values, List<Register> registers) {
+        for (Object o : values) {
+            if (o instanceof Register) {
+                registers.add((Register) o);
+            } else if (o instanceof Value) {
+                if (isRegister((Value) o)) {
+                    registers.add(asRegister((Value) o));
+                }
+            } else if (o instanceof Object[]) {
+                collectRegisters((Object[]) o, registers);
+            } else {
+                throw new IllegalArgumentException("Not a Register or Value: " + o);
+            }
+        }
+        return registers;
+    }
+}