1 /*
2 * Copyright (c) 1997, 2017, 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_VM_UTILITIES_CONSTANTTAG_HPP
26 #define SHARE_VM_UTILITIES_CONSTANTTAG_HPP
27
28 #include "memory/allocation.hpp"
29 #include "prims/jvm.h"
30
31 // constant tags in Java .class files
32
33
34 enum {
35 // See jvm.h for shared JVM_CONSTANT_XXX tags
36 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
37 // Hotspot specific tags
38 JVM_CONSTANT_Invalid = 0, // For bad value initialization
39 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course)
40 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use
41 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool
42 JVM_CONSTANT_StringIndex = 102, // Temporary tag while constructing constant pool
43 JVM_CONSTANT_UnresolvedClassInError = 103, // Error tag due to resolution error
44 JVM_CONSTANT_MethodHandleInError = 104, // Error tag due to resolution error
45 JVM_CONSTANT_MethodTypeInError = 105, // Error tag due to resolution error
46 JVM_CONSTANT_InvokeDynamicInError = 106, // Error tag due to resolution error
47 JVM_CONSTANT_InternalMax = 106 // Last implementation tag
48 };
49
50
51 class constantTag VALUE_OBJ_CLASS_SPEC {
52 private:
53 jbyte _tag;
54 public:
55 bool is_klass() const { return _tag == 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 _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
71 }
72
73 bool is_unresolved_klass_in_error() const {
74 return _tag == 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 bool is_invoke_dynamic_in_error() const {
84 return _tag == JVM_CONSTANT_InvokeDynamicInError;
85 }
86
87 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
88 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
89
90 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
91 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
92 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
93 bool is_symbol() const { return is_utf8(); }
94
95 bool is_method_type() const { return _tag == JVM_CONSTANT_MethodType; }
96 bool is_method_handle() const { return _tag == JVM_CONSTANT_MethodHandle; }
97 bool is_invoke_dynamic() const { return _tag == JVM_CONSTANT_InvokeDynamic; }
98
99 bool is_loadable_constant() const {
100 return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
101 is_method_type() || is_method_handle() ||
102 is_unresolved_klass());
103 }
104
105 constantTag() {
106 _tag = JVM_CONSTANT_Invalid;
107 }
108 constantTag(jbyte tag) {
109 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
110 (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
111 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
112 _tag = tag;
113 }
114
115 jbyte value() const { return _tag; }
116 jbyte error_value() const;
117 jbyte non_error_value() const;
118
119 BasicType basic_type() const; // if used with ldc, what kind of value gets pushed?
120
121 const char* internal_name() const; // for error reporting
122
123 void print_on(outputStream* st) const PRODUCT_RETURN;
124 };
125
126 #endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP