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 
isIllegal(Value value)36     public static boolean isIllegal(Value value) {
37         assert value != null;
38         return Value.ILLEGAL.equals(value);
39     }
40 
isIllegalJavaValue(JavaValue value)41     public static boolean isIllegalJavaValue(JavaValue value) {
42         assert value != null;
43         return Value.ILLEGAL.equals(value);
44     }
45 
isLegal(Value value)46     public static boolean isLegal(Value value) {
47         return !isIllegal(value);
48     }
49 
isVirtualObject(JavaValue value)50     public static boolean isVirtualObject(JavaValue value) {
51         assert value != null;
52         return value instanceof VirtualObject;
53     }
54 
asVirtualObject(JavaValue value)55     public static VirtualObject asVirtualObject(JavaValue value) {
56         assert value != null;
57         return (VirtualObject) value;
58     }
59 
isConstantJavaValue(JavaValue value)60     public static boolean isConstantJavaValue(JavaValue value) {
61         assert value != null;
62         return value instanceof JavaConstant;
63     }
64 
asConstantJavaValue(JavaValue value)65     public static JavaConstant asConstantJavaValue(JavaValue value) {
66         assert value != null;
67         return (JavaConstant) value;
68     }
69 
isAllocatableValue(Value value)70     public static boolean isAllocatableValue(Value value) {
71         assert value != null;
72         return value instanceof AllocatableValue;
73     }
74 
asAllocatableValue(Value value)75     public static AllocatableValue asAllocatableValue(Value value) {
76         assert value != null;
77         return (AllocatableValue) value;
78     }
79 
isStackSlot(Value value)80     public static boolean isStackSlot(Value value) {
81         assert value != null;
82         return value instanceof StackSlot;
83     }
84 
asStackSlot(Value value)85     public static StackSlot asStackSlot(Value value) {
86         assert value != null;
87         return (StackSlot) value;
88     }
89 
isRegister(Value value)90     public static boolean isRegister(Value value) {
91         assert value != null;
92         return value instanceof RegisterValue;
93     }
94 
asRegister(Value value)95     public static Register asRegister(Value value) {
96         return asRegisterValue(value).getRegister();
97     }
98 
asRegisterValue(Value value)99     public static RegisterValue asRegisterValue(Value value) {
100         assert value != null;
101         return (RegisterValue) value;
102     }
103 
asRegister(Value value, PlatformKind kind)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 }
112