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 /*

  * Copyright (c) 2011, 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.

  *

  * 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

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 /////////////// Unit tests ///////////////

 #ifndef PRODUCT

 #include "runtime/os.hpp"

 #include "utilities/quickSort.hpp"

 #include <stdlib.h>

 static int test_comparator(int a, int b) {

   if (a == b) {

     return 0;

   }

   if (a < b) {

     return -1;

   }

   return 1;

 }

 static int test_even_odd_comparator(int a, int b) {

   bool a_is_odd = (a % 2) == 1;

   bool b_is_odd = (b % 2) == 1;

   if (a_is_odd == b_is_odd) {

     return 0;

   }

   if (a_is_odd) {

     return -1;

   }

   return 1;

 }

 extern "C" {

   static int test_stdlib_comparator(const void* a, const void* b) {

     int ai = *(int*)a;

     int bi = *(int*)b;

     if (ai == bi) {

       return 0;

     }

     if (ai < bi) {

       return -1;

     }

     return 1;

   }

 }

 void QuickSort::print_array(const char* prefix, int* array, int length) {

   tty->print("%s:", prefix);

   for (int i = 0; i < length; i++) {

     tty->print(" %d", array[i]);

   }

   tty->print_cr("");

 }

 bool QuickSort::compare_arrays(int* actual, int* expected, int length) {

   for (int i = 0; i < length; i++) {

     if (actual[i] != expected[i]) {

       print_array("Sorted array  ", actual, length);

       print_array("Expected array", expected, length);

       return false;

     }

   }

   return true;

 }

 template <class C>

 bool QuickSort::sort_and_compare(int* arrayToSort, int* expectedResult, int length, C comparator, bool idempotent) {

   sort<int, C>(arrayToSort, length, comparator, idempotent);

   return compare_arrays(arrayToSort, expectedResult, length);

 }

 void QuickSort::test_quick_sort() {

   {

     int* test_array = NULL;

     int* expected_array = NULL;

     assert(sort_and_compare(test_array, expected_array, 0, test_comparator), "Empty array not handled");

   }

   {

     int test_array[] = {3};

     int expected_array[] = {3};

     assert(sort_and_compare(test_array, expected_array, 1, test_comparator), "Single value array not handled");

   }

   {

     int test_array[] = {3,2};

     int expected_array[] = {2,3};

     assert(sort_and_compare(test_array, expected_array, 2, test_comparator), "Array with 2 values not correctly sorted");

   }

   {

     int test_array[] = {3,2,1};

     int expected_array[] = {1,2,3};

     assert(sort_and_compare(test_array, expected_array, 3, test_comparator), "Array with 3 values not correctly sorted");

   }

   {

     int test_array[] = {4,3,2,1};

     int expected_array[] = {1,2,3,4};

     assert(sort_and_compare(test_array, expected_array, 4, test_comparator), "Array with 4 values not correctly sorted");

   }

   {

     int test_array[] = {7,1,5,3,6,9,8,2,4,0};

     int expected_array[] = {0,1,2,3,4,5,6,7,8,9};

     assert(sort_and_compare(test_array, expected_array, 10, test_comparator), "Array with 10 values not correctly sorted");

   }

   {

     int test_array[] = {4,4,1,4};

     int expected_array[] = {1,4,4,4};

     assert(sort_and_compare(test_array, expected_array, 4, test_comparator), "3 duplicates not sorted correctly");

   }

   {

     int test_array[] = {0,1,2,3,4,5,6,7,8,9};

     int expected_array[] = {0,1,2,3,4,5,6,7,8,9};

     assert(sort_and_compare(test_array, expected_array, 10, test_comparator), "Already sorted array not correctly sorted");

   }

   {

     // one of the random arrays that found an issue in the partion method.

     int test_array[] = {76,46,81,8,64,56,75,11,51,55,11,71,59,27,9,64,69,75,21,25,39,40,44,32,7,8,40,41,24,78,24,74,9,65,28,6,40,31,22,13,27,82};

     int expected_array[] = {6,7,8,8,9,9,11,11,13,21,22,24,24,25,27,27,28,31,32,39,40,40,40,41,44,46,51,55,56,59,64,64,65,69,71,74,75,75,76,78,81,82};

     assert(sort_and_compare(test_array, expected_array, 42, test_comparator), "Not correctly sorted");

   }

   {

     int test_array[] = {2,8,1,4};

     int expected_array[] = {1,4,2,8};

     assert(sort_and_compare(test_array, expected_array, 4, test_even_odd_comparator), "Even/odd not sorted correctly");

   }

   {  // Some idempotent tests

     {

       // An array of lenght 3 is only sorted by find_pivot. Make sure that it is idempotent.

       int test_array[] = {1,4,8};

       int expected_array[] = {1,4,8};

       assert(sort_and_compare(test_array, expected_array, 3, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {1,7,9,4,8,2};

       int expected_array[] = {1,7,9,4,8,2};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {1,9,7,4,2,8};

       int expected_array[] = {1,9,7,4,2,8};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {7,9,1,2,8,4};

       int expected_array[] = {7,9,1,2,8,4};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {7,1,9,2,4,8};

       int expected_array[] = {7,1,9,2,4,8};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {9,1,7,4,8,2};

       int expected_array[] = {9,1,7,4,8,2};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

     {

       int test_array[] = {9,7,1,4,2,8};

       int expected_array[] = {9,7,1,4,2,8};

       assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent");

     }

   }

   // test sorting random arrays

   for (int i = 0; i < 1000; i++) {

     int length = os::random() % 100;

     int* test_array = new int[length];

     int* expected_array = new int[length];

     for (int j = 0; j < length; j++) {

         // Choose random values, but get a chance of getting duplicates

         test_array[j] = os::random() % (length * 2);

         expected_array[j] = test_array[j];

     }

     // Compare sorting to stdlib::qsort()

     qsort(expected_array, length, sizeof(int), test_stdlib_comparator);

     assert(sort_and_compare(test_array, expected_array, length, test_comparator), "Random array not correctly sorted");

     // Make sure sorting is idempotent.

     // Both test_array and expected_array are sorted by the test_comparator.

     // Now sort them once with the test_even_odd_comparator. Then sort the

     // test_array one more time with test_even_odd_comparator and verify that

     // it is idempotent.

     sort(expected_array, length, test_even_odd_comparator, true);

     sort(test_array, length, test_even_odd_comparator, true);

     assert(compare_arrays(test_array, expected_array, length), "Sorting identical arrays rendered different results");

     sort(test_array, length, test_even_odd_comparator, true);

     assert(compare_arrays(test_array, expected_array, length), "Sorting already sorted array changed order of elements - not idempotent");

     delete[] test_array;

     delete[] expected_array;

   }

 }

 #endif