IntegerExpression.java

/*
 * Copyright (c) 1994, 2003, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
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package sun.tools.tree;

import sun.tools.java.*;
import sun.tools.asm.Assembler;

/**
 * WARNING: The contents of this source file are not part of any
 * supported API.  Code that depends on them does so at its own risk:
 * they are subject to change or removal without notice.
 */
public
class IntegerExpression extends ConstantExpression {
    int value;

    /**
     * Constructor
     */
    IntegerExpression(int op, long where, Type type, int value) {
        super(op, where, type);
        this.value = value;
    }

    /**
     * See if this number fits in the given type.
     */
    public boolean fitsType(Environment env, Context ctx, Type t) {
        if (this.type.isType(TC_CHAR)) {
            // A char constant is not really an int constant,
            // so do not report that 'a' fits in a byte or short,
            // even if its value is in fact 7-bit ascii.  See JLS 5.2.
            return super.fitsType(env, ctx, t);
        }
        switch (t.getTypeCode()) {
          case TC_BYTE:
            return value == (byte)value;
          case TC_SHORT:
            return value == (short)value;
          case TC_CHAR:
            return value == (char)value;
        }
        return super.fitsType(env, ctx, t);
    }

    /**
     * Get the value
     */
    public Object getValue() {
        return value;
    }

    /**
     * Check if the expression is equal to a value
     */
    public boolean equals(int i) {
        return value == i;
    }

    /**
     * Check if the expression is equal to its default static value
     */
    public boolean equalsDefault() {
        return value == 0;
    }

    /**
     * Code
     */
    public void codeValue(Environment env, Context ctx, Assembler asm) {
        asm.add(where, opc_ldc, value);
    }
}