view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/SLTypes.java @ 12396:3faec5ab0696

SL: updated simple lanugage type system to use an implicit cast.
author Christian Humer <christian.humer@gmail.com>
date Fri, 11 Oct 2013 20:06:33 +0200
parents f1c3f50ac36e
children 71991b7a0f14
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/*
 * Copyright (c) 2012, 2012, 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.
 */
package com.oracle.truffle.sl;

import java.math.*;

import com.oracle.truffle.api.dsl.*;

@TypeSystem({int.class, BigInteger.class, boolean.class, String.class})
public class SLTypes {

    @TypeCheck
    public boolean isInteger(Object value) {
        return value instanceof Integer || (value instanceof BigInteger && ((BigInteger) value).bitLength() < Integer.SIZE);
    }

    @TypeCast
    public int asInteger(Object value) {
        assert isInteger(value);
        if (value instanceof Integer) {
            return (int) value;
        } else {
            int result = ((BigInteger) value).intValue();
            assert BigInteger.valueOf(result).equals(value) : "Losing precision";
            return result;
        }
    }

    @ImplicitCast
    public BigInteger castBigInteger(int integer) {
        return BigInteger.valueOf(integer);
    }

}