1/*
2 * Copyright (c) 1997, 2014, 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.
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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
34enum {
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_InternalMax              = 105   // Last implementation tag
47};
48
49
50class constantTag VALUE_OBJ_CLASS_SPEC {
51 private:
52  jbyte _tag;
53 public:
54  bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }
55  bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
56  bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
57  bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
58  bool is_string() const            { return _tag == JVM_CONSTANT_String; }
59  bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
60  bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
61  bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
62  bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
63  bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
64  bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
65
66  bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
67
68  bool is_unresolved_klass() const {
69    return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
70  }
71
72  bool is_unresolved_klass_in_error() const {
73    return _tag == JVM_CONSTANT_UnresolvedClassInError;
74  }
75
76  bool is_method_handle_in_error() const {
77    return _tag == JVM_CONSTANT_MethodHandleInError;
78  }
79  bool is_method_type_in_error() const {
80    return _tag == JVM_CONSTANT_MethodTypeInError;
81  }
82
83  bool is_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }
84  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }
85
86  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }
87  bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
88  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }
89  bool is_symbol() const            { return is_utf8(); }
90
91  bool is_method_type() const              { return _tag == JVM_CONSTANT_MethodType; }
92  bool is_method_handle() const            { return _tag == JVM_CONSTANT_MethodHandle; }
93  bool is_invoke_dynamic() const           { return _tag == JVM_CONSTANT_InvokeDynamic; }
94
95  bool is_loadable_constant() const {
96    return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
97            is_method_type() || is_method_handle() ||
98            is_unresolved_klass());
99  }
100
101  constantTag() {
102    _tag = JVM_CONSTANT_Invalid;
103  }
104  constantTag(jbyte tag) {
105    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
106           (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
107           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
108    _tag = tag;
109  }
110
111  jbyte value() const                { return _tag; }
112  jbyte error_value() const;
113  jbyte non_error_value() const;
114
115  BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
116
117  const char* internal_name() const;  // for error reporting
118
119  void print_on(outputStream* st) const PRODUCT_RETURN;
120};
121
122#endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP
123