1 /*
   2  * Copyright (c) 1999, 2011, 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.
  34 class ciConstant VALUE_OBJ_CLASS_SPEC {
  35   friend class VMStructs;
  36 private:
  37   friend class ciEnv;
  38   friend class ciField;
  39 
  40   BasicType _type;
  41   union {
  42     jint      _int;
  43     jlong     _long;
  44     jint      _long_half[2];
  45     jfloat    _float;
  46     jdouble   _double;
  47     ciObject* _object;
  48   } _value;
  49 
  50 public:
  51 
  52   ciConstant() {
  53     _type = T_ILLEGAL; _value._long = -1;
  54   }
  55   ciConstant(BasicType type, jint value) {
  56     assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
  57            "using the wrong ciConstant constructor");
  58     _type = type; _value._int = value;
  59   }
  60   ciConstant(jlong value) {
  61     _type = T_LONG; _value._long = value;
  62   }
  63   ciConstant(jfloat value) {
  64     _type = T_FLOAT; _value._float = value;
  65   }
  66   ciConstant(jdouble value) {
  67     _type = T_DOUBLE; _value._double = value;
  68   }
  69   ciConstant(BasicType type, ciObject* p) {
  70     _type = type; _value._object = p;
  71   }
  72 
  73   BasicType basic_type() const { return _type; }
  74 
  75   jboolean  as_boolean() {
  76     assert(basic_type() == T_BOOLEAN, "wrong type");
  77     return (jboolean)_value._int;
  78   }
  79   jchar     as_char() {
  80     assert(basic_type() == T_CHAR, "wrong type");
  81     return (jchar)_value._int;
  82   }
  83   jbyte     as_byte() {
  84     assert(basic_type() == T_BYTE, "wrong type");
  85     return (jbyte)_value._int;
  86   }
  87   jshort    as_short() {
  88     assert(basic_type() == T_SHORT, "wrong type");
  89     return (jshort)_value._int;
  90   }
  91   jint      as_int() {
  92     assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR  ||
  93            basic_type() == T_BYTE    || basic_type() == T_SHORT ||
  94            basic_type() == T_INT, "wrong type");
  95     return _value._int;
  96   }
  97   jlong     as_long() {
  98     assert(basic_type() == T_LONG, "wrong type");
  99     return _value._long;
 100   }
 101   jfloat    as_float() {
 102     assert(basic_type() == T_FLOAT, "wrong type");
 103     return _value._float;
 104   }
 105   jdouble   as_double() {
 106     assert(basic_type() == T_DOUBLE, "wrong type");
 107     return _value._double;
 108   }
 109   ciObject* as_object() const {
 110     assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
 111     return _value._object;
 112   }
 113 
 114   // Debugging output
 115   void print();
 116 };
 117 
 118 #endif // SHARE_VM_CI_CICONSTANT_HPP