Java example source code file (Verify.java)
The Verify.java Java example source code/*
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* 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
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* questions.
*/
public class Verify {
public static String throwWord(boolean threw) {
return (threw ? "threw" : "didn't throw");
}
public static void verifyResult(UnaryMethod method, int result1, int result2, boolean exception1, boolean exception2, int value) {
if (exception1 != exception2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "]" + throwWord(exception1) + " exception, NonIntrinsic version" + throwWord(exception2) + " for: " + value);
}
if (result1 != result2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "] returned: " + result1 + " while NonIntrinsic version returned: " + result2);
}
}
public static void verifyResult(UnaryLongMethod method, long result1, long result2, boolean exception1, boolean exception2, long value) {
if (exception1 != exception2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "]" + throwWord(exception1) + " exception, NonIntrinsic version" + throwWord(exception2) + " for: " + value);
}
if (result1 != result2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "] returned: " + result1 + " while NonIntrinsic version returned: " + result2);
}
}
private static void verifyResult(BinaryMethod method, int result1, int result2, boolean exception1, boolean exception2, int a, int b) {
if (exception1 != exception2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "]" + throwWord(exception1) + " exception, NonIntrinsic version " + throwWord(exception2) + " for: " + a + " + " + b);
}
if (result1 != result2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "] returned: " + result1 + " while NonIntrinsic version returned: " + result2);
}
}
private static void verifyResult(BinaryLongMethod method, long result1, long result2, boolean exception1, boolean exception2, long a, long b) {
if (exception1 != exception2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "]" + throwWord(exception1) + " exception, NonIntrinsic version " + throwWord(exception2) + " for: " + a + " + " + b);
}
if (result1 != result2) {
throw new RuntimeException("Intrinsic version [" + method.name() + "] returned: " + result1 + " while NonIntrinsic version returned: " + result2);
}
}
public static void verifyUnary(int a, UnaryMethod method) {
boolean exception1 = false, exception2 = false;
int result1 = 0, result2 = 0;
try {
result1 = method.checkMethod(a);
} catch (ArithmeticException e) {
exception1 = true;
}
try {
result2 = method.safeMethod(a);
} catch (ArithmeticException e) {
exception2 = true;
}
verifyResult(method, result1, result2, exception1, exception2, a);
}
public static void verifyUnary(long a, UnaryLongMethod method) {
boolean exception1 = false, exception2 = false;
long result1 = 0, result2 = 0;
try {
result1 = method.checkMethod(a);
} catch (ArithmeticException e) {
exception1 = true;
}
try {
result2 = method.safeMethod(a);
} catch (ArithmeticException e) {
exception2 = true;
}
verifyResult(method, result1, result2, exception1, exception2, a);
}
public static void verifyBinary(int a, int b, BinaryMethod method) {
boolean exception1 = false, exception2 = false;
int result1 = 0, result2 = 0;
try {
result1 = method.checkMethod(a, b);
} catch (ArithmeticException e) {
exception1 = true;
}
try {
result2 = method.safeMethod(a, b);
} catch (ArithmeticException e) {
exception2 = true;
}
verifyResult(method, result1, result2, exception1, exception2, a, b);
}
public static void verifyBinary(long a, long b, BinaryLongMethod method) {
boolean exception1 = false, exception2 = false;
long result1 = 0, result2 = 0;
try {
result1 = method.checkMethod(a, b);
} catch (ArithmeticException e) {
exception1 = true;
}
try {
result2 = method.safeMethod(a, b);
} catch (ArithmeticException e) {
exception2 = true;
}
verifyResult(method, result1, result2, exception1, exception2, a, b);
}
public static class LoadTest {
public static java.util.Random rnd = new java.util.Random();
public static int[] values = new int[256];
public static void init() {
for (int i = 0; i < values.length; ++i) {
values[i] = rnd.nextInt();
}
}
public static void verify(BinaryMethod method) {
for (int i = 0; i < 50000; ++i) {
Verify.verifyBinary(values[i & 255], values[i & 255] - i, method);
Verify.verifyBinary(values[i & 255] + i, values[i & 255] - i, method);
Verify.verifyBinary(values[i & 255], values[i & 255], method);
if ((i & 1) == 1 && i > 5) {
Verify.verifyBinary(values[i & 255] + i, values[i & 255] - i, method);
} else {
Verify.verifyBinary(values[i & 255] - i, values[i & 255] + i, method);
}
Verify.verifyBinary(values[i & 255], values[(i + 1) & 255], method);
}
}
}
public static class NonConstantTest {
public static java.util.Random rnd = new java.util.Random();
public static void verify(BinaryMethod method) {
for (int i = 0; i < 50000; ++i) {
int rnd1 = rnd.nextInt(), rnd2 = rnd.nextInt();
Verify.verifyBinary(rnd1, rnd2, method);
Verify.verifyBinary(rnd1, rnd2 + 1, method);
Verify.verifyBinary(rnd1 + 1, rnd2, method);
Verify.verifyBinary(rnd1 - 1, rnd2, method);
Verify.verifyBinary(rnd1, rnd2 - 1, method);
}
}
}
public static class NonConstantLongTest {
public static long[] values = { Long.MIN_VALUE, Long.MAX_VALUE, 0, Long.MAX_VALUE - 1831 };
public static java.util.Random rnd = new java.util.Random();
public static void verify(BinaryLongMethod method) {
for (int i = 0; i < 50000; ++i) {
long rnd1 = rnd.nextLong(), rnd2 = rnd.nextLong();
Verify.verifyBinary(rnd1, rnd2, method);
Verify.verifyBinary(rnd1, rnd2 + 1, method);
Verify.verifyBinary(rnd1 + 1, rnd2, method);
Verify.verifyBinary(rnd1 - 1, rnd2, method);
Verify.verifyBinary(rnd1, rnd2 - 1, method);
Verify.verifyBinary(rnd1 + Long.MAX_VALUE - rnd2, rnd2 + 1, method);
Verify.verifyBinary(values[0], values[2], method);
Verify.verifyBinary(values[1], values[2], method);
Verify.verifyBinary(values[3], 74L, method);
}
}
}
public static class LoopDependentTest {
public static java.util.Random rnd = new java.util.Random();
public static void verify(BinaryMethod method) {
int rnd1 = rnd.nextInt(), rnd2 = rnd.nextInt();
runTest(rnd1, rnd2, method);
}
private static void runTest(int rnd1, int rnd2, BinaryMethod method) {
for (int i = 0; i < 50000; ++i) {
Verify.verifyBinary(rnd1 + i, rnd2 + i, method);
Verify.verifyBinary(rnd1 + i, rnd2 + (i & 0xff), method);
Verify.verifyBinary(rnd1 - i, rnd2 - (i & 0xff), method);
Verify.verifyBinary(rnd1 + i + 1, rnd2 + i + 2, method);
Verify.verifyBinary(rnd1 + i * 2, rnd2 + i, method);
}
}
}
public static class ConstantTest {
public static void verify(BinaryMethod method) {
for (int i = 0; i < 50000; ++i) {
Verify.verifyBinary(5, 7, method);
Verify.verifyBinary(Integer.MAX_VALUE, 1, method);
Verify.verifyBinary(Integer.MIN_VALUE, -1, method);
Verify.verifyBinary(Integer.MAX_VALUE, -1, method);
Verify.verifyBinary(Integer.MIN_VALUE, 1, method);
Verify.verifyBinary(Integer.MAX_VALUE / 2, Integer.MAX_VALUE / 2, method);
Verify.verifyBinary(Integer.MAX_VALUE / 2, (Integer.MAX_VALUE / 2) + 3, method);
Verify.verifyBinary(Integer.MAX_VALUE, Integer.MIN_VALUE, method);
}
}
}
public static class ConstantLongTest {
public static void verify(BinaryLongMethod method) {
for (int i = 0; i < 50000; ++i) {
Verify.verifyBinary(5, 7, method);
Verify.verifyBinary(Long.MAX_VALUE, 1, method);
Verify.verifyBinary(Long.MIN_VALUE, -1, method);
Verify.verifyBinary(Long.MAX_VALUE, -1, method);
Verify.verifyBinary(Long.MIN_VALUE, 1, method);
Verify.verifyBinary(Long.MAX_VALUE / 2, Long.MAX_VALUE / 2, method);
Verify.verifyBinary(Long.MAX_VALUE / 2, (Long.MAX_VALUE / 2) + 3, method);
Verify.verifyBinary(Long.MAX_VALUE, Long.MIN_VALUE, method);
}
}
}
public static interface BinaryMethod {
int safeMethod(int a, int b);
int checkMethod(int a, int b);
int unchecked(int a, int b);
String name();
}
public static interface UnaryMethod {
int safeMethod(int value);
int checkMethod(int value);
int unchecked(int value);
String name();
}
public static interface BinaryLongMethod {
long safeMethod(long a, long b);
long checkMethod(long a, long b);
long unchecked(long a, long b);
String name();
}
public static interface UnaryLongMethod {
long safeMethod(long value);
long checkMethod(long value);
long unchecked(long value);
String name();
}
public static class UnaryToBinary implements BinaryMethod {
private final UnaryMethod method;
public UnaryToBinary(UnaryMethod method) {
this.method = method;
}
@Override
public int safeMethod(int a, int b) {
return method.safeMethod(a);
}
@Override
public int checkMethod(int a, int b) {
return method.checkMethod(a);
}
@Override
public int unchecked(int a, int b) {
return method.unchecked(a);
}
@Override
public String name() {
return method.name();
}
}
public static class UnaryToBinaryLong implements BinaryLongMethod {
private final UnaryLongMethod method;
public UnaryToBinaryLong(UnaryLongMethod method) {
this.method = method;
}
@Override
public long safeMethod(long a, long b) {
return method.safeMethod(a);
}
@Override
public long checkMethod(long a, long b) {
return method.checkMethod(a);
}
@Override
public long unchecked(long a, long b) {
return method.unchecked(a);
}
@Override
public String name() {
return method.name();
}
}
public static class AddExactI implements BinaryMethod {
@Override
public int safeMethod(int x, int y) {
int r = x + y;
// HD 2-12 Overflow iff both arguments have the opposite sign of the result
if (((x ^ r) & (y ^ r)) < 0) {
throw new ArithmeticException("integer overflow");
}
return r;
}
@Override
public int checkMethod(int a, int b) {
return Math.addExact(a, b);
}
@Override
public String name() {
return "addExact";
}
@Override
public int unchecked(int a, int b) {
return a + b;
}
}
public static class AddExactL implements BinaryLongMethod {
@Override
public long safeMethod(long x, long y) {
long r = x + y;
// HD 2-12 Overflow iff both arguments have the opposite sign of the result
if (((x ^ r) & (y ^ r)) < 0) {
throw new ArithmeticException("integer overflow");
}
return r;
}
@Override
public long checkMethod(long a, long b) {
return Math.addExact(a, b);
}
@Override
public String name() {
return "addExactLong";
}
@Override
public long unchecked(long a, long b) {
return a + b;
}
}
public static class MulExactI implements BinaryMethod {
@Override
public int safeMethod(int x, int y) {
long r = (long)x * (long)y;
if ((int)r != r) {
throw new ArithmeticException("integer overflow");
}
return (int)r;
}
@Override
public int checkMethod(int a, int b) {
return Math.multiplyExact(a, b);
}
@Override
public int unchecked(int a, int b) {
return a * b;
}
@Override
public String name() {
return "multiplyExact";
}
}
public static class MulExactL implements BinaryLongMethod {
@Override
public long safeMethod(long x, long y) {
long r = x * y;
long ax = Math.abs(x);
long ay = Math.abs(y);
if (((ax | ay) >>> 31 != 0)) {
// Some bits greater than 2^31 that might cause overflow
// Check the result using the divide operator
// and check for the special case of Long.MIN_VALUE * -1
if (((y != 0) && (r / y != x)) ||
(x == Long.MIN_VALUE && y == -1)) {
throw new ArithmeticException("long overflow");
}
}
return r;
}
@Override
public long checkMethod(long a, long b) {
return Math.multiplyExact(a, b);
}
@Override
public long unchecked(long a, long b) {
return a * b;
}
@Override
public String name() {
return "multiplyExact";
}
}
public static class NegExactL implements UnaryLongMethod {
@Override
public long safeMethod(long a) {
if (a == Long.MIN_VALUE) {
throw new ArithmeticException("long overflow");
}
return -a;
}
@Override
public long checkMethod(long value) {
return Math.negateExact(value);
}
@Override
public long unchecked(long value) {
return -value;
}
@Override
public String name() {
return "negateExactLong";
}
}
public static class NegExactI implements UnaryMethod {
@Override
public int safeMethod(int a) {
if (a == Integer.MIN_VALUE) {
throw new ArithmeticException("integer overflow");
}
return -a;
}
@Override
public int checkMethod(int value) {
return Math.negateExact(value);
}
@Override
public int unchecked(int value) {
return -value;
}
@Override
public String name() {
return "negateExact";
}
}
public static class SubExactI implements BinaryMethod {
@Override
public int safeMethod(int x, int y) {
int r = x - y;
// HD 2-12 Overflow iff the arguments have different signs and
// the sign of the result is different than the sign of x
if (((x ^ y) & (x ^ r)) < 0) {
throw new ArithmeticException("integer overflow");
}
return r;
}
@Override
public int checkMethod(int a, int b) {
return Math.subtractExact(a, b);
}
@Override
public int unchecked(int a, int b) {
return a - b;
}
@Override
public String name() {
return "subtractExact";
}
}
public static class SubExactL implements BinaryLongMethod {
@Override
public long safeMethod(long x, long y) {
long r = x - y;
// HD 2-12 Overflow iff the arguments have different signs and
// the sign of the result is different than the sign of x
if (((x ^ y) & (x ^ r)) < 0) {
throw new ArithmeticException("integer overflow");
}
return r;
}
@Override
public long checkMethod(long a, long b) {
return Math.subtractExact(a, b);
}
@Override
public long unchecked(long a, long b) {
return a - b;
}
@Override
public String name() {
return "subtractExactLong";
}
}
static class IncExactL implements UnaryLongMethod {
@Override
public long safeMethod(long a) {
if (a == Long.MAX_VALUE) {
throw new ArithmeticException("long overflow");
}
return a + 1L;
}
@Override
public long checkMethod(long value) {
return Math.incrementExact(value);
}
@Override
public long unchecked(long value) {
return value + 1;
}
@Override
public String name() {
return "incrementExactLong";
}
}
static class IncExactI implements UnaryMethod {
@Override
public int safeMethod(int a) {
if (a == Integer.MAX_VALUE) {
throw new ArithmeticException("integer overflow");
}
return a + 1;
}
@Override
public int checkMethod(int value) {
return Math.incrementExact(value);
}
@Override
public int unchecked(int value) {
return value + 1;
}
@Override
public String name() {
return "incrementExact";
}
}
static class DecExactL implements UnaryLongMethod {
@Override
public long safeMethod(long a) {
if (a == Long.MIN_VALUE) {
throw new ArithmeticException("long overflow");
}
return a - 1L;
}
@Override
public long checkMethod(long value) {
return Math.decrementExact(value);
}
@Override
public long unchecked(long value) {
return value - 1;
}
@Override
public String name() {
return "decExactLong";
}
}
static class DecExactI implements UnaryMethod {
@Override
public int safeMethod(int a) {
if (a == Integer.MIN_VALUE) {
throw new ArithmeticException("integer overflow");
}
return a - 1;
}
@Override
public int checkMethod(int value) {
return Math.decrementExact(value);
}
@Override
public int unchecked(int value) {
return value - 1;
}
@Override
public String name() {
return "decrementExact";
}
}
}
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