BigInteger_DivideAndRemainder.java example

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/**
 * Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.symbolic.vm.bigint;

import java.lang.reflect.Array;
import java.math.BigInteger;

import org.evosuite.symbolic.expr.bv.IntegerValue;
import org.evosuite.symbolic.expr.ref.ReferenceConstant;
import org.evosuite.symbolic.expr.ref.ReferenceExpression;
import org.evosuite.symbolic.vm.ExpressionFactory;
import org.evosuite.symbolic.vm.SymbolicFunction;
import org.evosuite.symbolic.vm.SymbolicEnvironment;
import org.evosuite.symbolic.vm.SymbolicHeap;

public final class BigInteger_DivideAndRemainder extends SymbolicFunction {

	private static final String DIVIDE_AND_REMAINDER = "divideAndRemainder";
	private static final int REMAINDER_ARRAY_INDEX = 1;
	private static final int QUOTIENT_ARRAY_INDEX = 0;

	public BigInteger_DivideAndRemainder(SymbolicEnvironment env) {
		super(env, Types.JAVA_MATH_BIG_INTEGER, DIVIDE_AND_REMAINDER,
				Types.BIG_INTEGER_TO_BIG_INTEGER_ARRAY);
	}

	@Override
	public Object executeFunction() {
		BigInteger conc_left_big_integer = (BigInteger) this.getConcReceiver();
		ReferenceConstant symb_left_big_integer = this.getSymbReceiver();

		BigInteger conc_right_big_integer = (BigInteger) this
				.getConcArgument(0);
		ReferenceConstant symb_right_big_integer = (ReferenceConstant) this
				.getSymbArgument(0);

		Object res = this.getConcRetVal();
		ReferenceExpression symb_res = this.getSymbRetVal();

		if (res != null && conc_left_big_integer != null
				&& conc_right_big_integer != null) {

			IntegerValue left_big_integer_expr = this.env.heap.getField(
					Types.JAVA_MATH_BIG_INTEGER,
					SymbolicHeap.$BIG_INTEGER_CONTENTS, conc_left_big_integer,
					symb_left_big_integer, conc_left_big_integer.longValue());

			IntegerValue right_big_integer_expr = this.env.heap.getField(
					Types.JAVA_MATH_BIG_INTEGER,
					SymbolicHeap.$BIG_INTEGER_CONTENTS, conc_right_big_integer,
					symb_right_big_integer, conc_right_big_integer.longValue());

			if (left_big_integer_expr.containsSymbolicVariable()
					|| right_big_integer_expr.containsSymbolicVariable()) {

				// quotient
				BigInteger conc_quotient = (BigInteger) Array.get(res,
						QUOTIENT_ARRAY_INDEX);

				ReferenceConstant symb_quotient = (ReferenceConstant) this.env.heap
						.getReference(conc_quotient);

				IntegerValue symb_div_value = ExpressionFactory.div(
						left_big_integer_expr, right_big_integer_expr,
						conc_quotient.longValue());

				this.env.heap.putField(Types.JAVA_MATH_BIG_INTEGER,
						SymbolicHeap.$BIG_INTEGER_CONTENTS, conc_quotient,
						symb_quotient, symb_div_value);

				// remainder
				BigInteger conc_remainder = (BigInteger) Array.get(res,
						REMAINDER_ARRAY_INDEX);

				ReferenceConstant symb_remainder = (ReferenceConstant) this.env.heap
						.getReference(conc_remainder);

				IntegerValue symb_rem_value = ExpressionFactory.rem(
						left_big_integer_expr, right_big_integer_expr,
						conc_remainder.longValue());

				this.env.heap.putField(Types.JAVA_MATH_BIG_INTEGER,
						SymbolicHeap.$BIG_INTEGER_CONTENTS, conc_remainder,
						symb_remainder, symb_rem_value);

			}
		}

		return symb_res;
	}

}