1 /*
   2  * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package jdk.vm.ci.code;
  24 
  25 import jdk.vm.ci.meta.AllocatableValue;
  26 import jdk.vm.ci.meta.JavaConstant;
  27 import jdk.vm.ci.meta.JavaValue;
  28 import jdk.vm.ci.meta.PlatformKind;
  29 import jdk.vm.ci.meta.Value;
  30 
  31 /**
  32  * Utility class for working with the {@link Value} class and its subclasses.
  33  */
  34 public final class ValueUtil {
  35 
  36     public static boolean isIllegal(Value value) {
  37         assert value != null;
  38         return Value.ILLEGAL.equals(value);
  39     }
  40 
  41     public static boolean isIllegalJavaValue(JavaValue value) {
  42         assert value != null;
  43         return Value.ILLEGAL.equals(value);
  44     }
  45 
  46     public static boolean isLegal(Value value) {
  47         return !isIllegal(value);
  48     }
  49 
  50     public static boolean isVirtualObject(JavaValue value) {
  51         assert value != null;
  52         return value instanceof VirtualObject;
  53     }
  54 
  55     public static VirtualObject asVirtualObject(JavaValue value) {
  56         assert value != null;
  57         return (VirtualObject) value;
  58     }
  59 
  60     public static boolean isConstantJavaValue(JavaValue value) {
  61         assert value != null;
  62         return value instanceof JavaConstant;
  63     }
  64 
  65     public static JavaConstant asConstantJavaValue(JavaValue value) {
  66         assert value != null;
  67         return (JavaConstant) value;
  68     }
  69 
  70     public static boolean isAllocatableValue(Value value) {
  71         assert value != null;
  72         return value instanceof AllocatableValue;
  73     }
  74 
  75     public static AllocatableValue asAllocatableValue(Value value) {
  76         assert value != null;
  77         return (AllocatableValue) value;
  78     }
  79 
  80     public static boolean isStackSlot(Value value) {
  81         assert value != null;
  82         return value instanceof StackSlot;
  83     }
  84 
  85     public static StackSlot asStackSlot(Value value) {
  86         assert value != null;
  87         return (StackSlot) value;
  88     }
  89 
  90     public static boolean isRegister(Value value) {
  91         assert value != null;
  92         return value instanceof RegisterValue;
  93     }
  94 
  95     public static Register asRegister(Value value) {
  96         return asRegisterValue(value).getRegister();
  97     }
  98 
  99     public static RegisterValue asRegisterValue(Value value) {
 100         assert value != null;
 101         return (RegisterValue) value;
 102     }
 103 
 104     public static Register asRegister(Value value, PlatformKind kind) {
 105         if (value.getPlatformKind() != kind) {
 106             throw new InternalError("needed: " + kind + " got: " + value.getPlatformKind());
 107         } else {
 108             return asRegister(value);
 109         }
 110     }
 111 }