ciConstant.hpp revision 5776:de6a9e811145
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 // Debugging output 128 void print(); 129}; 130 131#endif // SHARE_VM_CI_CICONSTANT_HPP 132