1 /*
   2  * Copyright (c) 1999, 2003, 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 // ciConstant
  26 //
  27 // This class represents a constant value.
  28 class ciConstant VALUE_OBJ_CLASS_SPEC {
  29 private:
  30   friend class ciEnv;
  31   friend class ciField;
  32 
  33   BasicType _type;
  34   union {
  35     jint      _int;
  36     jlong     _long;
  37     jint      _long_half[2];
  38     jfloat    _float;
  39     jdouble   _double;
  40     ciObject* _object;
  41   } _value;
  42 
  43   // Implementation of the print method.
  44   void print_impl(outputStream* st);
  45 
  46 public:
  47 
  48   ciConstant() {
  49     _type = T_ILLEGAL; _value._long = -1;
  50   }
  51   ciConstant(BasicType type, jint value) {
  52     assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
  53            "using the wrong ciConstant constructor");
  54     _type = type; _value._int = value;
  55   }
  56   ciConstant(jlong value) {
  57     _type = T_LONG; _value._long = value;
  58   }
  59   ciConstant(jfloat value) {
  60     _type = T_FLOAT; _value._float = value;
  61   }
  62   ciConstant(jdouble value) {
  63     _type = T_DOUBLE; _value._double = value;
  64   }
  65   ciConstant(BasicType type, ciObject* p) {
  66     _type = type; _value._object = p;
  67   }
  68 
  69   BasicType basic_type() const { return _type; }
  70 
  71   jboolean  as_boolean() {
  72     assert(basic_type() == T_BOOLEAN, "wrong type");
  73     return (jboolean)_value._int;
  74   }
  75   jchar     as_char() {
  76     assert(basic_type() == T_CHAR, "wrong type");
  77     return (jchar)_value._int;
  78   }
  79   jbyte     as_byte() {
  80     assert(basic_type() == T_BYTE, "wrong type");
  81     return (jbyte)_value._int;
  82   }
  83   jshort    as_short() {
  84     assert(basic_type() == T_SHORT, "wrong type");
  85     return (jshort)_value._int;
  86   }
  87   jint      as_int() {
  88     assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR  ||
  89            basic_type() == T_BYTE    || basic_type() == T_SHORT ||
  90            basic_type() == T_INT, "wrong type");
  91     return _value._int;
  92   }
  93   jlong     as_long() {
  94     assert(basic_type() == T_LONG, "wrong type");
  95     return _value._long;
  96   }
  97   jfloat    as_float() {
  98     assert(basic_type() == T_FLOAT, "wrong type");
  99     return _value._float;
 100   }
 101   jdouble   as_double() {
 102     assert(basic_type() == T_DOUBLE, "wrong type");
 103     return _value._double;
 104   }
 105   ciObject* as_object() const {
 106     assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
 107     return _value._object;
 108   }
 109 
 110   // Debugging output
 111   void print();
 112 };