DivRemExpression.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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.
 *
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package sun.tools.tree;

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

/**
 * 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.
 */
abstract public
class DivRemExpression extends BinaryArithmeticExpression {
    /**
     * constructor
     */
    public DivRemExpression(int op, long where, Expression left, Expression right) {
	super(op, where, left, right);
    }
  
    /**
     * Inline
     */
    public Expression inline(Environment env, Context ctx) {
        // Do not toss out integer divisions or remainders since they 
        // can cause a division by zero.
        if (type.inMask(TM_INTEGER)) { 
	    right = right.inlineValue(env, ctx);
	    if (right.isConstant() && !right.equals(0)) { 
	        // We know the division can be elided
	        left = left.inline(env, ctx);
		return left;
	    } else { 
	        left = left.inlineValue(env, ctx);
		try {
		    return eval().simplify();
		} catch (ArithmeticException e) {
		    env.error(where, "arithmetic.exception");
		    return this;
		}
	    }
	} else { 
   	    // float & double divisions don't cause arithmetic errors
	    return super.inline(env, ctx);
	}
    }
}