1 /*
2 * Copyright (c) 1997, 2021, 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 "utilities/globalDefinitions.hpp"
29
30
31 class outputStream;
32
33 // constant tags in Java .class files
34
35 enum {
36 // See jvm.h for shared JVM_CONSTANT_XXX tags
37 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
38 // Hotspot specific tags
39 JVM_CONSTANT_Invalid = 0, // For bad value initialization
40 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course)
41 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use
42 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool
43 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool
44 JVM_CONSTANT_UnresolvedClassInError = 103, // Error tag due to resolution error
45 JVM_CONSTANT_MethodHandleInError = 104, // Error tag due to resolution error
46 JVM_CONSTANT_MethodTypeInError = 105, // Error tag due to resolution error
47 JVM_CONSTANT_DynamicInError = 106, // Error tag due to resolution error
48 JVM_CONSTANT_InternalMax = 106 // Last implementation tag
49 };
50
51
52 class constantTag {
53 private:
54 jbyte _tag;
55 public:
56 bool is_klass() const { return _tag == JVM_CONSTANT_Class; }
57 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; }
58 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; }
59 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; }
60 bool is_string() const { return _tag == JVM_CONSTANT_String; }
61 bool is_int() const { return _tag == JVM_CONSTANT_Integer; }
62 bool is_float() const { return _tag == JVM_CONSTANT_Float; }
63 bool is_long() const { return _tag == JVM_CONSTANT_Long; }
64 bool is_double() const { return _tag == JVM_CONSTANT_Double; }
65 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; }
66 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; }
67
68 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; }
69
70 bool is_unresolved_klass() const {
71 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
72 }
73
74 bool is_unresolved_klass_in_error() const {
75 return _tag == JVM_CONSTANT_UnresolvedClassInError;
76 }
77
78 bool is_method_handle_in_error() const {
79 return _tag == JVM_CONSTANT_MethodHandleInError;
80 }
81 bool is_method_type_in_error() const {
82 return _tag == JVM_CONSTANT_MethodTypeInError;
83 }
84
85 bool is_dynamic_constant_in_error() const {
86 return _tag == JVM_CONSTANT_DynamicInError;
87 }
88
89 bool is_in_error() const {
90 return is_unresolved_klass_in_error() ||
91 is_method_handle_in_error() ||
92 is_method_type_in_error() ||
93 is_dynamic_constant_in_error();
94 }
95
96 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
97 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
98
99 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
100 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
101 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
102 bool is_symbol() const { return is_utf8(); }
103
104 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; }
105 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; }
106 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; }
107 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; }
108
109 bool has_bootstrap() const {
110 return (_tag == JVM_CONSTANT_Dynamic ||
111 _tag == JVM_CONSTANT_DynamicInError ||
112 _tag == JVM_CONSTANT_InvokeDynamic);
113 }
114
115 bool is_loadable_constant() const {
116 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
117 is_method_type() || is_method_handle() || is_dynamic_constant() ||
118 is_unresolved_klass());
119 }
120
121 constantTag() {
122 _tag = JVM_CONSTANT_Invalid;
123 }
124 constantTag(jbyte tag) {
125 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
126 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
127 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
128 _tag = tag;
129 }
130
131 static jbyte type2tag(BasicType bt) {
132 if (is_subword_type(bt)) {
133 bt = T_INT;
134 }
135 if (bt == T_ARRAY) {
136 bt = T_OBJECT;
137 }
138 switch (bt) {
139 case T_INT: return JVM_CONSTANT_Integer;
140 case T_LONG: return JVM_CONSTANT_Long;
141 case T_FLOAT: return JVM_CONSTANT_Float;
142 case T_DOUBLE: return JVM_CONSTANT_Double;
143 case T_OBJECT: return JVM_CONSTANT_String;
144
145 default:
146 assert(false, "not supported: %s", type2name(bt));
147 return JVM_CONSTANT_Invalid;
148 }
149 }
150
151 jbyte value() const { return _tag; }
152 jbyte error_value() const;
153 jbyte non_error_value() const;
154
155 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed?
156
157 const char* internal_name() const; // for error reporting
158
159 void print_on(outputStream* st) const PRODUCT_RETURN;
160 };
161
162 #endif // SHARE_UTILITIES_CONSTANTTAG_HPP