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/*
* Copyright (c) 1999, 2013, 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 VALUE_OBJ_CLASS_SPEC {
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;
}
}
// Debugging output
void print();
};
#endif // SHARE_VM_CI_CICONSTANT_HPP
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