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1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #ifndef SHARE_VM_CI_CICONSTANT_HPP |
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26 #define SHARE_VM_CI_CICONSTANT_HPP |
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27 |
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28 #include "ci/ciClassList.hpp" |
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29 #include "ci/ciNullObject.hpp" |
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30 |
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31 // ciConstant |
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32 // |
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33 // This class represents a constant value. |
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34 class ciConstant VALUE_OBJ_CLASS_SPEC { |
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35 friend class VMStructs; |
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36 private: |
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37 friend class ciEnv; |
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38 friend class ciField; |
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39 |
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40 BasicType _type; |
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41 union { |
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42 jint _int; |
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43 jlong _long; |
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44 jfloat _float; |
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45 jdouble _double; |
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46 ciObject* _object; |
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47 } _value; |
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48 |
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49 public: |
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50 |
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51 ciConstant() { |
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52 _type = T_ILLEGAL; _value._long = -1; |
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53 } |
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54 ciConstant(BasicType type, jint value) { |
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55 assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT, |
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56 "using the wrong ciConstant constructor"); |
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57 _type = type; _value._int = value; |
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58 } |
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59 ciConstant(jlong value) { |
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60 _type = T_LONG; _value._long = value; |
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61 } |
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62 ciConstant(jfloat value) { |
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63 _type = T_FLOAT; _value._float = value; |
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64 } |
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65 ciConstant(jdouble value) { |
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66 _type = T_DOUBLE; _value._double = value; |
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67 } |
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68 ciConstant(BasicType type, ciObject* p) { |
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69 _type = type; _value._object = p; |
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70 } |
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71 |
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72 BasicType basic_type() const { return _type; } |
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73 |
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74 jboolean as_boolean() { |
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75 assert(basic_type() == T_BOOLEAN, "wrong type"); |
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76 return (jboolean)_value._int; |
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77 } |
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78 jchar as_char() { |
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79 assert(basic_type() == T_CHAR, "wrong type"); |
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80 return (jchar)_value._int; |
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81 } |
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82 jbyte as_byte() { |
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83 assert(basic_type() == T_BYTE, "wrong type"); |
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84 return (jbyte)_value._int; |
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85 } |
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86 jshort as_short() { |
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87 assert(basic_type() == T_SHORT, "wrong type"); |
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88 return (jshort)_value._int; |
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89 } |
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90 jint as_int() { |
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91 assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR || |
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92 basic_type() == T_BYTE || basic_type() == T_SHORT || |
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93 basic_type() == T_INT, "wrong type"); |
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94 return _value._int; |
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95 } |
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96 jlong as_long() { |
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97 assert(basic_type() == T_LONG, "wrong type"); |
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98 return _value._long; |
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99 } |
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100 jfloat as_float() { |
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101 assert(basic_type() == T_FLOAT, "wrong type"); |
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102 return _value._float; |
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103 } |
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104 jdouble as_double() { |
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105 assert(basic_type() == T_DOUBLE, "wrong type"); |
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106 return _value._double; |
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107 } |
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108 ciObject* as_object() const { |
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109 assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type"); |
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110 return _value._object; |
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111 } |
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112 |
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113 bool is_null_or_zero() const { |
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114 if (!is_java_primitive(basic_type())) { |
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115 return as_object()->is_null_object(); |
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116 } else if (type2size[basic_type()] == 1) { |
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117 // treat float bits as int, to avoid comparison with -0 and NaN |
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118 return (_value._int == 0); |
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119 } else if (type2size[basic_type()] == 2) { |
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120 // treat double bits as long, to avoid comparison with -0 and NaN |
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121 return (_value._long == 0); |
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122 } else { |
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123 return false; |
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124 } |
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125 } |
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126 |
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127 bool is_valid() const { |
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128 return basic_type() != T_ILLEGAL; |
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129 } |
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130 // Debugging output |
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131 void print(); |
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132 }; |
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133 |
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134 #endif // SHARE_VM_CI_CICONSTANT_HPP |