aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_CI_CICONSTANT_HPP
aoqi@0: #define SHARE_VM_CI_CICONSTANT_HPP
aoqi@0: 
aoqi@0: #include "ci/ciClassList.hpp"
aoqi@0: #include "ci/ciNullObject.hpp"
aoqi@0: 
aoqi@0: // ciConstant
aoqi@0: //
aoqi@0: // This class represents a constant value.
aoqi@0: class ciConstant VALUE_OBJ_CLASS_SPEC {
aoqi@0:   friend class VMStructs;
aoqi@0: private:
aoqi@0:   friend class ciEnv;
aoqi@0:   friend class ciField;
aoqi@0: 
aoqi@0:   BasicType _type;
aoqi@0:   union {
aoqi@0:     jint      _int;
aoqi@0:     jlong     _long;
aoqi@0:     jfloat    _float;
aoqi@0:     jdouble   _double;
aoqi@0:     ciObject* _object;
aoqi@0:   } _value;
aoqi@0: 
aoqi@0: public:
aoqi@0: 
aoqi@0:   ciConstant() {
aoqi@0:     _type = T_ILLEGAL; _value._long = -1;
aoqi@0:   }
aoqi@0:   ciConstant(BasicType type, jint value) {
aoqi@0:     assert(type != T_LONG && type != T_DOUBLE && type != T_FLOAT,
aoqi@0:            "using the wrong ciConstant constructor");
aoqi@0:     _type = type; _value._int = value;
aoqi@0:   }
aoqi@0:   ciConstant(jlong value) {
aoqi@0:     _type = T_LONG; _value._long = value;
aoqi@0:   }
aoqi@0:   ciConstant(jfloat value) {
aoqi@0:     _type = T_FLOAT; _value._float = value;
aoqi@0:   }
aoqi@0:   ciConstant(jdouble value) {
aoqi@0:     _type = T_DOUBLE; _value._double = value;
aoqi@0:   }
aoqi@0:   ciConstant(BasicType type, ciObject* p) {
aoqi@0:     _type = type; _value._object = p;
aoqi@0:   }
aoqi@0: 
aoqi@0:   BasicType basic_type() const { return _type; }
aoqi@0: 
aoqi@0:   jboolean  as_boolean() {
aoqi@0:     assert(basic_type() == T_BOOLEAN, "wrong type");
aoqi@0:     return (jboolean)_value._int;
aoqi@0:   }
aoqi@0:   jchar     as_char() {
aoqi@0:     assert(basic_type() == T_CHAR, "wrong type");
aoqi@0:     return (jchar)_value._int;
aoqi@0:   }
aoqi@0:   jbyte     as_byte() {
aoqi@0:     assert(basic_type() == T_BYTE, "wrong type");
aoqi@0:     return (jbyte)_value._int;
aoqi@0:   }
aoqi@0:   jshort    as_short() {
aoqi@0:     assert(basic_type() == T_SHORT, "wrong type");
aoqi@0:     return (jshort)_value._int;
aoqi@0:   }
aoqi@0:   jint      as_int() {
aoqi@0:     assert(basic_type() == T_BOOLEAN || basic_type() == T_CHAR  ||
aoqi@0:            basic_type() == T_BYTE    || basic_type() == T_SHORT ||
aoqi@0:            basic_type() == T_INT, "wrong type");
aoqi@0:     return _value._int;
aoqi@0:   }
aoqi@0:   jlong     as_long() {
aoqi@0:     assert(basic_type() == T_LONG, "wrong type");
aoqi@0:     return _value._long;
aoqi@0:   }
aoqi@0:   jfloat    as_float() {
aoqi@0:     assert(basic_type() == T_FLOAT, "wrong type");
aoqi@0:     return _value._float;
aoqi@0:   }
aoqi@0:   jdouble   as_double() {
aoqi@0:     assert(basic_type() == T_DOUBLE, "wrong type");
aoqi@0:     return _value._double;
aoqi@0:   }
aoqi@0:   ciObject* as_object() const {
aoqi@0:     assert(basic_type() == T_OBJECT || basic_type() == T_ARRAY, "wrong type");
aoqi@0:     return _value._object;
aoqi@0:   }
aoqi@0: 
aoqi@0:   bool      is_null_or_zero() const {
aoqi@0:     if (!is_java_primitive(basic_type())) {
aoqi@0:       return as_object()->is_null_object();
aoqi@0:     } else if (type2size[basic_type()] == 1) {
aoqi@0:       // treat float bits as int, to avoid comparison with -0 and NaN
aoqi@0:       return (_value._int == 0);
aoqi@0:     } else if (type2size[basic_type()] == 2) {
aoqi@0:       // treat double bits as long, to avoid comparison with -0 and NaN
aoqi@0:       return (_value._long == 0);
aoqi@0:     } else {
aoqi@0:       return false;
aoqi@0:     }
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Debugging output
aoqi@0:   void print();
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_CI_CICONSTANT_HPP