1 /*
2 * Copyright (c) 1997, 2019, 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 #ifndef SHARE_UTILITIES_CONSTANTTAG_HPP
26 #define SHARE_UTILITIES_CONSTANTTAG_HPP
27
28 #include "jvm.h"
29 #include "utilities/globalDefinitions.hpp"
30
31
32 class outputStream;
33
34 // constant tags in Java .class files
35
36 enum {
37 // See jvm.h for shared JVM_CONSTANT_XXX tags
38 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
39 // Hotspot specific tags
40 JVM_CONSTANT_Invalid = 0, // For bad value initialization
41 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course)
42 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use
43 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool
44 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool
45 JVM_CONSTANT_UnresolvedClassInError = 103, // Error tag due to resolution error
46 JVM_CONSTANT_MethodHandleInError = 104, // Error tag due to resolution error
47 JVM_CONSTANT_MethodTypeInError = 105, // Error tag due to resolution error
48 JVM_CONSTANT_DynamicInError = 106, // Error tag due to resolution error
49 JVM_CONSTANT_InternalMax = 106 // Last implementation tag
50 };
51
52
53 class constantTag {
54 private:
55 jbyte _tag;
56 public:
57 bool is_klass() const { return _tag == JVM_CONSTANT_Class; }
58 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; }
59 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; }
60 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; }
61 bool is_string() const { return _tag == JVM_CONSTANT_String; }
62 bool is_int() const { return _tag == JVM_CONSTANT_Integer; }
63 bool is_float() const { return _tag == JVM_CONSTANT_Float; }
64 bool is_long() const { return _tag == JVM_CONSTANT_Long; }
65 bool is_double() const { return _tag == JVM_CONSTANT_Double; }
66 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; }
67 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; }
68
69 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; }
70
71 bool is_unresolved_klass() const {
72 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
73 }
74
75 bool is_unresolved_klass_in_error() const {
76 return _tag == JVM_CONSTANT_UnresolvedClassInError;
77 }
78
79 bool is_method_handle_in_error() const {
80 return _tag == JVM_CONSTANT_MethodHandleInError;
81 }
82 bool is_method_type_in_error() const {
83 return _tag == JVM_CONSTANT_MethodTypeInError;
84 }
85
86 bool is_dynamic_constant_in_error() const {
87 return _tag == JVM_CONSTANT_DynamicInError;
88 }
89
90 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
91 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
92
93 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
94 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
95 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
96 bool is_symbol() const { return is_utf8(); }
97
98 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; }
99 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; }
100 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; }
101 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; }
102
103 bool has_bootstrap() const {
104 return (_tag == JVM_CONSTANT_Dynamic ||
105 _tag == JVM_CONSTANT_DynamicInError ||
106 _tag == JVM_CONSTANT_InvokeDynamic);
107 }
108
109 bool is_loadable_constant() const {
110 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
111 is_method_type() || is_method_handle() || is_dynamic_constant() ||
112 is_unresolved_klass());
113 }
114
115 constantTag() {
116 _tag = JVM_CONSTANT_Invalid;
117 }
118 constantTag(jbyte tag) {
119 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
120 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
121 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
122 _tag = tag;
123 }
124
125 static constantTag ofBasicType(BasicType bt) {
126 if (is_subword_type(bt)) bt = T_INT;
127 switch (bt) {
128 case T_OBJECT: return constantTag(JVM_CONSTANT_String);
129 case T_INT: return constantTag(JVM_CONSTANT_Integer);
130 case T_LONG: return constantTag(JVM_CONSTANT_Long);
131 case T_FLOAT: return constantTag(JVM_CONSTANT_Float);
132 case T_DOUBLE: return constantTag(JVM_CONSTANT_Double);
133 default: break;
134 }
135 assert(false, "bad basic type for tag");
136 return constantTag();
137 }
138
139 jbyte value() const { return _tag; }
140 jbyte error_value() const;
141 jbyte non_error_value() const;
142
143 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed?
144
145 const char* internal_name() const; // for error reporting
146
147 void print_on(outputStream* st) const PRODUCT_RETURN;
148 };
149
150 #endif // SHARE_UTILITIES_CONSTANTTAG_HPP