1 /*
2 * Copyright (c) 2001, 2011, 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 */
24
25 package sun.jvm.hotspot.utilities;
26
27 import sun.jvm.hotspot.runtime.BasicType;
28
29 public class ConstantTag {
30 // These replicated from the VM to save space
31 private static final int JVM_CONSTANT_Utf8 = 1;
32 private static final int JVM_CONSTANT_Unicode = 2; // unused
33 private static final int JVM_CONSTANT_Integer = 3;
34 private static final int JVM_CONSTANT_Float = 4;
35 private static final int JVM_CONSTANT_Long = 5;
36 private static final int JVM_CONSTANT_Double = 6;
37 private static final int JVM_CONSTANT_Class = 7;
38 private static final int JVM_CONSTANT_String = 8;
39 private static final int JVM_CONSTANT_Fieldref = 9;
40 private static final int JVM_CONSTANT_Methodref = 10;
41 private static final int JVM_CONSTANT_InterfaceMethodref = 11;
42 private static final int JVM_CONSTANT_NameAndType = 12;
43 private static final int JVM_CONSTANT_MethodHandle = 15; // JSR 292
44 private static final int JVM_CONSTANT_MethodType = 16; // JSR 292
45 // static final int JVM_CONSTANT_(unused) = 17; // JSR 292 early drafts only
46 private static final int JVM_CONSTANT_InvokeDynamic = 18; // JSR 292
47 private static final int JVM_CONSTANT_Invalid = 0; // For bad value initialization
48 private static final int JVM_CONSTANT_UnresolvedClass = 100; // Temporary tag until actual use
49 private static final int JVM_CONSTANT_ClassIndex = 101; // Temporary tag while constructing constant pool
50 private static final int JVM_CONSTANT_UnresolvedString = 102; // Temporary tag until actual use
51 private static final int JVM_CONSTANT_StringIndex = 103; // Temporary tag while constructing constant pool
52 private static final int JVM_CONSTANT_UnresolvedClassInError = 104; // Resolution failed
53 private static final int JVM_CONSTANT_Object = 105; // Required for BoundMethodHandle arguments.
54
55 // JVM_CONSTANT_MethodHandle subtypes //FIXME: connect these to data structure
56 private static int JVM_REF_getField = 1;
57 private static int JVM_REF_getStatic = 2;
58 private static int JVM_REF_putField = 3;
59 private static int JVM_REF_putStatic = 4;
60 private static int JVM_REF_invokeVirtual = 5;
61 private static int JVM_REF_invokeStatic = 6;
62 private static int JVM_REF_invokeSpecial = 7;
63 private static int JVM_REF_newInvokeSpecial = 8;
64 private static int JVM_REF_invokeInterface = 9;
65
66 private byte tag;
67
68 public ConstantTag(byte tag) {
69 this.tag = tag;
70 }
71
72 public int value() { return tag; }
73
74 public boolean isKlass() { return tag == JVM_CONSTANT_Class; }
75 public boolean isField () { return tag == JVM_CONSTANT_Fieldref; }
76 public boolean isMethod() { return tag == JVM_CONSTANT_Methodref; }
77 public boolean isInterfaceMethod() { return tag == JVM_CONSTANT_InterfaceMethodref; }
78 public boolean isString() { return tag == JVM_CONSTANT_String; }
79 public boolean isInt() { return tag == JVM_CONSTANT_Integer; }
80 public boolean isFloat() { return tag == JVM_CONSTANT_Float; }
81 public boolean isLong() { return tag == JVM_CONSTANT_Long; }
82 public boolean isDouble() { return tag == JVM_CONSTANT_Double; }
83 public boolean isNameAndType() { return tag == JVM_CONSTANT_NameAndType; }
84 public boolean isUtf8() { return tag == JVM_CONSTANT_Utf8; }
85 public boolean isMethodHandle() { return tag == JVM_CONSTANT_MethodHandle; }
86 public boolean isMethodType() { return tag == JVM_CONSTANT_MethodType; }
87 public boolean isInvokeDynamic() { return tag == JVM_CONSTANT_InvokeDynamic; }
88
89 public boolean isInvalid() { return tag == JVM_CONSTANT_Invalid; }
90
91 public boolean isUnresolvedKlass() {
92 return tag == JVM_CONSTANT_UnresolvedClass || tag == JVM_CONSTANT_UnresolvedClassInError;
93 }
94 public boolean isUnresolveKlassInError() { return tag == JVM_CONSTANT_UnresolvedClassInError; }
95 public boolean isKlassIndex() { return tag == JVM_CONSTANT_ClassIndex; }
96 public boolean isUnresolvedString() { return tag == JVM_CONSTANT_UnresolvedString; }
97 public boolean isStringIndex() { return tag == JVM_CONSTANT_StringIndex; }
98
99 public boolean isObject() { return tag == JVM_CONSTANT_Object; }
100
101 public boolean isKlassReference() { return isKlassIndex() || isUnresolvedKlass(); }
102 public boolean isFieldOrMethod() { return isField() || isMethod() || isInterfaceMethod(); }
103 public boolean isSymbol() { return isUtf8(); }
104
105 public BasicType basicType() {
106 switch (tag) {
107 case JVM_CONSTANT_Integer :
108 return BasicType.T_INT;
109 case JVM_CONSTANT_Float :
110 return BasicType.T_FLOAT;
111 case JVM_CONSTANT_Long :
112 return BasicType.T_LONG;
113 case JVM_CONSTANT_Double :
114 return BasicType.T_DOUBLE;
115
116 case JVM_CONSTANT_Class :
117 case JVM_CONSTANT_String :
118 case JVM_CONSTANT_UnresolvedClass :
119 case JVM_CONSTANT_UnresolvedClassInError :
120 case JVM_CONSTANT_ClassIndex :
121 case JVM_CONSTANT_UnresolvedString :
122 case JVM_CONSTANT_StringIndex :
123 case JVM_CONSTANT_MethodHandle :
124 case JVM_CONSTANT_MethodType :
125 case JVM_CONSTANT_Object :
126 return BasicType.T_OBJECT;
127 default:
128 throw new InternalError("unexpected tag: " + tag);
129 }
130 }
131 }