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, class redefinition
43 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool, class redefinition
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 class constantTag {
52 private:
53 jbyte _tag;
54 public:
55 bool is_klass() const { return value() == JVM_CONSTANT_Class; }
56 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; }
57 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; }
58 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; }
59 bool is_string() const { return _tag == JVM_CONSTANT_String; }
60 bool is_int() const { return _tag == JVM_CONSTANT_Integer; }
61 bool is_float() const { return _tag == JVM_CONSTANT_Float; }
62 bool is_long() const { return _tag == JVM_CONSTANT_Long; }
63 bool is_double() const { return _tag == JVM_CONSTANT_Double; }
64 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; }
65 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; }
66
67 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; }
68
69 bool is_unresolved_klass() const {
70 return value() == JVM_CONSTANT_UnresolvedClass || value() == JVM_CONSTANT_UnresolvedClassInError;
71 }
72
73 bool is_unresolved_klass_in_error() const {
74 return value() == JVM_CONSTANT_UnresolvedClassInError;
75 }
76
77 bool is_method_handle_in_error() const {
78 return _tag == JVM_CONSTANT_MethodHandleInError;
79 }
80 bool is_method_type_in_error() const {
81 return _tag == JVM_CONSTANT_MethodTypeInError;
82 }
83
84 bool is_dynamic_constant_in_error() const {
85 return _tag == JVM_CONSTANT_DynamicInError;
86 }
87
88 bool is_in_error() const {
89 return is_unresolved_klass_in_error() ||
90 is_method_handle_in_error() ||
91 is_method_type_in_error() ||
92 is_dynamic_constant_in_error();
93 }
94
95 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
96 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
97
98 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
99 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
100 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
101 bool is_symbol() const { return is_utf8(); }
102
103 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; }
104 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; }
105 bool is_dynamic_constant() const { return _tag == JVM_CONSTANT_Dynamic; }
106 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; }
107
108 bool has_bootstrap() const {
109 return (_tag == JVM_CONSTANT_Dynamic ||
110 _tag == JVM_CONSTANT_DynamicInError ||
111 _tag == JVM_CONSTANT_InvokeDynamic);
112 }
113
114 bool is_loadable_constant() const {
115 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
116 is_method_type() || is_method_handle() || is_dynamic_constant() ||
117 is_unresolved_klass());
118 }
119
120 constantTag() {
121 _tag = JVM_CONSTANT_Invalid;
122 }
123 constantTag(jbyte tag) {
124 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
125 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
126 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
127 _tag = tag;
128 }
129
130 static jbyte type2tag(BasicType bt) {
131 if (is_subword_type(bt)) {
132 bt = T_INT;
133 }
134 if (bt == T_ARRAY) {
135 bt = T_OBJECT;
136 }
137 switch (bt) {
138 case T_INT: return JVM_CONSTANT_Integer;
139 case T_LONG: return JVM_CONSTANT_Long;
140 case T_FLOAT: return JVM_CONSTANT_Float;
141 case T_DOUBLE: return JVM_CONSTANT_Double;
142 case T_OBJECT: return JVM_CONSTANT_String;
143
144 default:
145 assert(false, "not supported: %s", type2name(bt));
146 return JVM_CONSTANT_Invalid;
147 }
148 }
149
150 jbyte value() const { return _tag; }
151 jbyte tag() 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