407 lines
15 KiB
Java
407 lines
15 KiB
Java
/*
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* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.math.BigInteger;
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/**
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* @test Test for Math.*Exact integer and long methods.
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* @bug 6708398
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* @summary Basic tests for Math exact arithmetic operations.
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*
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* @author Roger Riggs
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*/
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public class ExactArithTests {
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/**
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* The count of test errors.
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*/
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private static int errors = 0;
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/**
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* @param args the command line arguments
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*/
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public static void main(String[] args) {
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testIntegerExact();
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testLongExact();
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testLongIntExact();
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if (errors > 0) {
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throw new RuntimeException(errors + " errors found in ExactArithTests.");
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}
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}
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static void fail(String message) {
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errors++;
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System.err.println(message);
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}
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/**
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* Test Math.addExact, multiplyExact, subtractExact, toIntValue methods
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* with {@code int} arguments.
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*/
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static void testIntegerExact() {
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testIntegerExact(0, 0);
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testIntegerExact(1, 1);
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testIntegerExact(1, -1);
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testIntegerExact(-1, 1);
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testIntegerExact(1000, 2000);
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testIntegerExact(Integer.MIN_VALUE, Integer.MIN_VALUE);
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testIntegerExact(Integer.MAX_VALUE, Integer.MAX_VALUE);
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testIntegerExact(Integer.MIN_VALUE, 1);
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testIntegerExact(Integer.MAX_VALUE, 1);
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testIntegerExact(Integer.MIN_VALUE, 2);
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testIntegerExact(Integer.MAX_VALUE, 2);
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testIntegerExact(Integer.MIN_VALUE, -1);
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testIntegerExact(Integer.MAX_VALUE, -1);
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testIntegerExact(Integer.MIN_VALUE, -2);
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testIntegerExact(Integer.MAX_VALUE, -2);
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}
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/**
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* Test exact arithmetic by comparing with the same operations using long
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* and checking that the result is the same as the integer truncation.
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* Errors are reported with {@link fail}.
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*
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* @param x first parameter
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* @param y second parameter
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*/
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static void testIntegerExact(int x, int y) {
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try {
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// Test addExact
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int sum = Math.addExact(x, y);
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long sum2 = (long) x + (long) y;
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if ((int) sum2 != sum2) {
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fail("FAIL: int Math.addExact(" + x + " + " + y + ") = " + sum + "; expected Arithmetic exception");
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} else if (sum != sum2) {
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fail("FAIL: long Math.addExact(" + x + " + " + y + ") = " + sum + "; expected: " + sum2);
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}
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} catch (ArithmeticException ex) {
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long sum2 = (long) x + (long) y;
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if ((int) sum2 == sum2) {
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fail("FAIL: int Math.addExact(" + x + " + " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test subtractExact
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int diff = Math.subtractExact(x, y);
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long diff2 = (long) x - (long) y;
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if ((int) diff2 != diff2) {
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fail("FAIL: int Math.subtractExact(" + x + " - " + y + ") = " + diff + "; expected: " + diff2);
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}
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} catch (ArithmeticException ex) {
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long diff2 = (long) x - (long) y;
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if ((int) diff2 == diff2) {
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fail("FAIL: int Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test multiplyExact
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int product = Math.multiplyExact(x, y);
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long m2 = (long) x * (long) y;
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if ((int) m2 != m2) {
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fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ") = " + product + "; expected: " + m2);
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}
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} catch (ArithmeticException ex) {
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long m2 = (long) x * (long) y;
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if ((int) m2 == m2) {
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fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test incrementExact
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int inc = Math.incrementExact(x);
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long inc2 = (long) x + 1L;
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if ((int) inc2 != inc2) {
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fail("FAIL: int Math.incrementExact(" + x + ") = " + inc + "; expected Arithmetic exception");
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} else if (inc != inc2) {
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fail("FAIL: long Math.incrementExact(" + x + ") = " + inc + "; expected: " + inc2);
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}
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} catch (ArithmeticException ex) {
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long inc2 = (long) x + 1L;
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if ((int) inc2 == inc2) {
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fail("FAIL: int Math.incrementExact(" + x + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test decrementExact
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int dec = Math.decrementExact(x);
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long dec2 = (long) x - 1L;
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if ((int) dec2 != dec2) {
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fail("FAIL: int Math.decrementExact(" + x + ") = " + dec + "; expected Arithmetic exception");
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} else if (dec != dec2) {
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fail("FAIL: long Math.decrementExact(" + x + ") = " + dec + "; expected: " + dec2);
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}
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} catch (ArithmeticException ex) {
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long dec2 = (long) x - 1L;
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if ((int) dec2 == dec2) {
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fail("FAIL: int Math.decrementExact(" + x + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test negateExact
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int neg = Math.negateExact(x);
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long neg2 = -((long)x) ;
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if ((int) neg2 != neg2) {
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fail("FAIL: int Math.negateExact(" + x + ") = " + neg + "; expected Arithmetic exception");
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} else if (neg != neg2) {
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fail("FAIL: long Math.negateExact(" + x + ") = " + neg + "; expected: " + neg2);
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}
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} catch (ArithmeticException ex) {
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long neg2 = (long) x - 1L;
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if ((int) neg2 == neg2) {
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fail("FAIL: int Math.negateExact(" + x + ")" + "; Unexpected exception: " + ex);
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}
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}
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}
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/**
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* Test Math.addExact, multiplyExact, subtractExact, toIntExact methods
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* with {@code long} arguments.
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*/
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static void testLongExact() {
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testLongExactTwice(0, 0);
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testLongExactTwice(1, 1);
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testLongExactTwice(1, -1);
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testLongExactTwice(1000, 2000);
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testLongExactTwice(Long.MIN_VALUE, Long.MIN_VALUE);
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testLongExactTwice(Long.MAX_VALUE, Long.MAX_VALUE);
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testLongExactTwice(Long.MIN_VALUE, 1);
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testLongExactTwice(Long.MAX_VALUE, 1);
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testLongExactTwice(Long.MIN_VALUE, 2);
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testLongExactTwice(Long.MAX_VALUE, 2);
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testLongExactTwice(Long.MIN_VALUE, -1);
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testLongExactTwice(Long.MAX_VALUE, -1);
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testLongExactTwice(Long.MIN_VALUE, -2);
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testLongExactTwice(Long.MAX_VALUE, -2);
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testLongExactTwice(Long.MIN_VALUE/2, 2);
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testLongExactTwice(Long.MAX_VALUE, 2);
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testLongExactTwice(Integer.MAX_VALUE, Integer.MAX_VALUE);
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testLongExactTwice(Integer.MAX_VALUE, -Integer.MAX_VALUE);
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testLongExactTwice(Integer.MAX_VALUE+1, Integer.MAX_VALUE+1);
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testLongExactTwice(Integer.MAX_VALUE+1, -Integer.MAX_VALUE+1);
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testLongExactTwice(Integer.MIN_VALUE-1, Integer.MIN_VALUE-1);
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testLongExactTwice(Integer.MIN_VALUE-1, -Integer.MIN_VALUE-1);
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testLongExactTwice(Integer.MIN_VALUE/2, 2);
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}
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/**
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* Test each of the exact operations with the arguments and
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* with the arguments reversed.
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* @param x
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* @param y
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*/
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static void testLongExactTwice(long x, long y) {
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testLongExact(x, y);
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testLongExact(y, x);
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}
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/**
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* Test long exact arithmetic by comparing with the same operations using BigInteger
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* and checking that the result is the same as the long truncation.
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* Errors are reported with {@link fail}.
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*
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* @param x first parameter
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* @param y second parameter
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*/
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static void testLongExact(long x, long y) {
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BigInteger resultBig = null;
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final BigInteger xBig = BigInteger.valueOf(x);
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final BigInteger yBig = BigInteger.valueOf(y);
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try {
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// Test addExact
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resultBig = xBig.add(yBig);
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long sum = Math.addExact(x, y);
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checkResult("long Math.addExact", x, y, sum, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.addExact(" + x + " + " + y + "); Unexpected exception: " + ex);
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}
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}
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try {
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// Test subtractExact
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resultBig = xBig.subtract(yBig);
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long diff = Math.subtractExact(x, y);
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checkResult("long Math.subtractExact", x, y, diff, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test multiplyExact
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resultBig = xBig.multiply(yBig);
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long product = Math.multiplyExact(x, y);
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checkResult("long Math.multiplyExact", x, y, product, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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try {
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// Test incrementExact
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resultBig = xBig.add(BigInteger.ONE);
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long inc = Math.incrementExact(x);
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checkResult("long Math.incrementExact", x, 1L, inc, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.incrementExact(" + x + "); Unexpected exception: " + ex);
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}
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}
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try {
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// Test decrementExact
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resultBig = xBig.subtract(BigInteger.ONE);
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long dec = Math.decrementExact(x);
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checkResult("long Math.decrementExact", x, 1L, dec, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.decrementExact(" + x + "); Unexpected exception: " + ex);
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}
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}
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try {
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// Test negateExact
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resultBig = xBig.negate();
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long dec = Math.negateExact(x);
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checkResult("long Math.negateExact", x, 0L, dec, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.negateExact(" + x + "); Unexpected exception: " + ex);
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}
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}
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try {
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// Test toIntExact
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int value = Math.toIntExact(x);
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if ((long)value != x) {
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fail("FAIL: " + "long Math.toIntExact" + "(" + x + ") = " + value + "; expected an arithmetic exception: ");
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}
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} catch (ArithmeticException ex) {
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if (resultBig.bitLength() <= 32) {
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fail("FAIL: long Math.toIntExact(" + x + ")" + "; Unexpected exception: " + ex);
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}
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}
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}
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/**
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* Compare the expected and actual results.
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* @param message message for the error
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* @param x first argument
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* @param y second argument
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* @param result actual result value
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* @param expected expected result value
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*/
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static void checkResult(String message, long x, long y, long result, BigInteger expected) {
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BigInteger resultBig = BigInteger.valueOf(result);
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if (!inLongRange(expected)) {
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fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected an arithmetic exception: ");
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} else if (!resultBig.equals(expected)) {
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fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected " + expected);
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}
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}
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/**
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* Check if the value fits in 64 bits (a long).
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* @param value
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* @return true if the value fits in 64 bits (including the sign).
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*/
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static boolean inLongRange(BigInteger value) {
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return value.bitLength() <= 63;
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}
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/**
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* Test Math.multiplyExact method with {@code long} and {@code int}
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* arguments.
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*/
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static void testLongIntExact() {
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testLongIntExact(0, 0);
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testLongIntExact(1, 1);
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testLongIntExact(1, -1);
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testLongIntExact(1000, 2000);
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testLongIntExact(Long.MIN_VALUE, Integer.MIN_VALUE);
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testLongIntExact(Long.MAX_VALUE, Integer.MAX_VALUE);
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testLongIntExact(Long.MIN_VALUE, 1);
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testLongIntExact(Long.MAX_VALUE, 1);
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testLongIntExact(Long.MIN_VALUE, 2);
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testLongIntExact(Long.MAX_VALUE, 2);
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testLongIntExact(Long.MIN_VALUE, -1);
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testLongIntExact(Long.MAX_VALUE, -1);
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testLongIntExact(Long.MIN_VALUE, -2);
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testLongIntExact(Long.MAX_VALUE, -2);
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testLongIntExact(Long.MIN_VALUE/2, 2);
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testLongIntExact(Long.MAX_VALUE, 2);
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testLongIntExact(Integer.MAX_VALUE, Integer.MAX_VALUE);
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testLongIntExact(Integer.MAX_VALUE, -Integer.MAX_VALUE);
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testLongIntExact((long)Integer.MAX_VALUE+1L, Integer.MAX_VALUE);
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testLongIntExact((long)Integer.MAX_VALUE+1L, -Integer.MAX_VALUE+1);
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testLongIntExact((long)Integer.MIN_VALUE-1L, Integer.MIN_VALUE);
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testLongIntExact((long)Integer.MIN_VALUE-1, Integer.MAX_VALUE);
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testLongIntExact(Integer.MIN_VALUE/2, 2);
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}
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/**
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* Test long-int exact arithmetic by comparing with the same operations using BigInteger
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* and checking that the result is the same as the long truncation.
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* Errors are reported with {@link fail}.
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*
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* @param x first parameter
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* @param y second parameter
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*/
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static void testLongIntExact(long x, int y) {
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BigInteger resultBig = null;
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final BigInteger xBig = BigInteger.valueOf(x);
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final BigInteger yBig = BigInteger.valueOf(y);
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try {
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// Test multiplyExact
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resultBig = xBig.multiply(yBig);
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long product = Math.multiplyExact(x, y);
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checkResult("long Math.multiplyExact", x, y, product, resultBig);
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} catch (ArithmeticException ex) {
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if (inLongRange(resultBig)) {
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fail("FAIL: long Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex);
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}
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}
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}
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}
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