1/*
2 * Copyright (c) 1999, 2013, 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_CI_CICONSTANT_HPP
26#define SHARE_VM_CI_CICONSTANT_HPP
27
28#include "ci/ciClassList.hpp"
29#include "ci/ciNullObject.hpp"
30
31// ciConstant
32//
33// This class represents a constant value.
34class ciConstant VALUE_OBJ_CLASS_SPEC {
35  friend class VMStructs;
36private:
37  friend class ciEnv;
38  friend class ciField;
39
40  BasicType _type;
41  union {
42    jint      _int;
43    jlong     _long;
44    jfloat    _float;
45    jdouble   _double;
46    ciObject* _object;
47  } _value;
48
49public:
50
51  ciConstant() {
52    _type = T_ILLEGAL; _value._long = -1;
53  }
54  ciConstant(BasicType type, jint value) {
55    assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
56           "using the wrong ciConstant constructor");
57    _type = type; _value._int = value;
58  }
59  ciConstant(jlong value) {
60    _type = T_LONG; _value._long = value;
61  }
62  ciConstant(jfloat value) {
63    _type = T_FLOAT; _value._float = value;
64  }
65  ciConstant(jdouble value) {
66    _type = T_DOUBLE; _value._double = value;
67  }
68  ciConstant(BasicType type, ciObject* p) {
69    _type = type; _value._object = p;
70  }
71
72  BasicType basic_type() const { return _type; }
73
74  jboolean  as_boolean() {
75    assert(basic_type() == T_BOOLEAN, "wrong type");
76    return (jboolean)_value._int;
77  }
78  jchar     as_char() {
79    assert(basic_type() == T_CHAR, "wrong type");
80    return (jchar)_value._int;
81  }
82  jbyte     as_byte() {
83    assert(basic_type() == T_BYTE, "wrong type");
84    return (jbyte)_value._int;
85  }
86  jshort    as_short() {
87    assert(basic_type() == T_SHORT, "wrong type");
88    return (jshort)_value._int;
89  }
90  jint      as_int() {
91    assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR  ||
92           basic_type() == T_BYTE    || basic_type() == T_SHORT ||
93           basic_type() == T_INT, "wrong type");
94    return _value._int;
95  }
96  jlong     as_long() {
97    assert(basic_type() == T_LONG, "wrong type");
98    return _value._long;
99  }
100  jfloat    as_float() {
101    assert(basic_type() == T_FLOAT, "wrong type");
102    return _value._float;
103  }
104  jdouble   as_double() {
105    assert(basic_type() == T_DOUBLE, "wrong type");
106    return _value._double;
107  }
108  ciObject* as_object() const {
109    assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
110    return _value._object;
111  }
112
113  bool      is_null_or_zero() const {
114    if (!is_java_primitive(basic_type())) {
115      return as_object()->is_null_object();
116    } else if (type2size[basic_type()] == 1) {
117      // treat float bits as int, to avoid comparison with -0 and NaN
118      return (_value._int == 0);
119    } else if (type2size[basic_type()] == 2) {
120      // treat double bits as long, to avoid comparison with -0 and NaN
121      return (_value._long == 0);
122    } else {
123      return false;
124    }
125  }
126
127  bool is_valid() const {
128    return basic_type() != T_ILLEGAL;
129  }
130  // Debugging output
131  void print();
132};
133
134#endif // SHARE_VM_CI_CICONSTANT_HPP
135