text: /*
   * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   *
   */
  
  #ifndef SHARE_VM_CI_CICONSTANT_HPP
  #define SHARE_VM_CI_CICONSTANT_HPP
  
  #include "ci/ciClassList.hpp"
  #include "ci/ciNullObject.hpp"
  
  // ciConstant
  //
  // This class represents a constant value.
  class ciConstant {
    friend class VMStructs;
  private:
    friend class ciEnv;
    friend class ciField;
  
    BasicType _type;
    union {
      jint      _int;
      jlong     _long;
      jfloat    _float;
      jdouble   _double;
      ciObject* _object;
    } _value;
  
  public:
  
    ciConstant() {
      _type = T_ILLEGAL; _value._long = -1;
    }
    ciConstant(BasicType type, jint value) {
      assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
             "using the wrong ciConstant constructor");
      _type = type; _value._int = value;
    }
    ciConstant(jlong value) {
      _type = T_LONG; _value._long = value;
    }
    ciConstant(jfloat value) {
      _type = T_FLOAT; _value._float = value;
    }
    ciConstant(jdouble value) {
      _type = T_DOUBLE; _value._double = value;
    }
    ciConstant(BasicType type, ciObject* p) {
      _type = type; _value._object = p;
    }
  
    BasicType basic_type() const { return _type; }
  
    jboolean  as_boolean() {
      assert(basic_type() == T_BOOLEAN, "wrong type");
      return (jboolean)_value._int;
    }
    jchar     as_char() {
      assert(basic_type() == T_CHAR, "wrong type");
      return (jchar)_value._int;
    }
    jbyte     as_byte() {
      assert(basic_type() == T_BYTE, "wrong type");
      return (jbyte)_value._int;
    }
    jshort    as_short() {
      assert(basic_type() == T_SHORT, "wrong type");
      return (jshort)_value._int;
    }
    jint      as_int() {
      assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR  ||
             basic_type() == T_BYTE    || basic_type() == T_SHORT ||
             basic_type() == T_INT, "wrong type");
      return _value._int;
    }
    jlong     as_long() {
      assert(basic_type() == T_LONG, "wrong type");
      return _value._long;
    }
    jfloat    as_float() {
      assert(basic_type() == T_FLOAT, "wrong type");
      return _value._float;
    }
    jdouble   as_double() {
      assert(basic_type() == T_DOUBLE, "wrong type");
      return _value._double;
    }
    ciObject* as_object() const {
      assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
      return _value._object;
    }
  
    bool      is_null_or_zero() const {
      if (!is_java_primitive(basic_type())) {
        return as_object()->is_null_object();
      } else if (type2size[basic_type()] == 1) {
        // treat float bits as int, to avoid comparison with -0 and NaN
        return (_value._int == 0);
      } else if (type2size[basic_type()] == 2) {
        // treat double bits as long, to avoid comparison with -0 and NaN
        return (_value._long == 0);
      } else {
        return false;
      }
    }
  
    bool is_valid() const {
      return basic_type() != T_ILLEGAL;
    }
    // Debugging output
    void print();
  };
  
  #endif // SHARE_VM_CI_CICONSTANT_HPP
  