1 /* 2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "utilities/quickSort.hpp" 27 28 #ifndef PRODUCT 29 30 // Unit tests 31 32 #include "runtime/os.hpp" 33 #include <stdlib.h> 34 35 static int test_comparator(int a, int b) { 36 if (a == b) { 37 return 0; 38 } 39 if (a < b) { 40 return -1; 41 } 42 return 1; 43 } 44 45 static int test_even_odd_comparator(int a, int b) { 46 bool a_is_odd = (a % 2) == 1; 47 bool b_is_odd = (b % 2) == 1; 48 if (a_is_odd == b_is_odd) { 49 return 0; 50 } 51 if (a_is_odd) { 52 return -1; 53 } 54 return 1; 55 } 56 57 static int test_stdlib_comparator(const void* a, const void* b) { 58 int ai = *(int*)a; 59 int bi = *(int*)b; 60 if (ai == bi) { 61 return 0; 62 } 63 if (ai < bi) { 64 return -1; 65 } 66 return 1; 67 } 68 69 void QuickSort::print_array(const char* prefix, int* array, int length) { 70 tty->print("%s:", prefix); 71 for (int i = 0; i < length; i++) { 72 tty->print(" %d", array[i]); 73 } 74 tty->print_cr(""); 75 } 76 77 bool QuickSort::compare_arrays(int* actual, int* expected, int length) { 78 for (int i = 0; i < length; i++) { 79 if (actual[i] != expected[i]) { 80 print_array("Sorted array ", actual, length); 81 print_array("Expected array", expected, length); 82 return false; 83 } 84 } 85 return true; 86 } 87 88 template <class C> 89 bool QuickSort::sort_and_compare(int* arrayToSort, int* expectedResult, int length, C comparator, bool idempotent) { 90 sort<int, C>(arrayToSort, length, comparator, idempotent); 91 return compare_arrays(arrayToSort, expectedResult, length); 92 } 93 94 bool QuickSort::test_quick_sort() { 95 #if 0 96 tty->print_cr("test_quick_sort\n"); 97 { 98 int* test_array = NULL; 99 int* expected_array = NULL; 100 assert(sort_and_compare(test_array, expected_array, 0, test_comparator), "Empty array not handled"); 101 } 102 { 103 int test_array[] = {3}; 104 int expected_array[] = {3}; 105 assert(sort_and_compare(test_array, expected_array, 1, test_comparator), "Single value array not handled"); 106 } 107 { 108 int test_array[] = {3,2}; 109 int expected_array[] = {2,3}; 110 assert(sort_and_compare(test_array, expected_array, 2, test_comparator), "Array with 2 values not correctly sorted"); 111 } 112 { 113 int test_array[] = {3,2,1}; 114 int expected_array[] = {1,2,3}; 115 assert(sort_and_compare(test_array, expected_array, 3, test_comparator), "Array with 3 values not correctly sorted"); 116 } 117 { 118 int test_array[] = {4,3,2,1}; 119 int expected_array[] = {1,2,3,4}; 120 assert(sort_and_compare(test_array, expected_array, 4, test_comparator), "Array with 4 values not correctly sorted"); 121 } 122 { 123 int test_array[] = {7,1,5,3,6,9,8,2,4,0}; 124 int expected_array[] = {0,1,2,3,4,5,6,7,8,9}; 125 assert(sort_and_compare(test_array, expected_array, 10, test_comparator), "Array with 10 values not correctly sorted"); 126 } 127 { 128 int test_array[] = {4,4,1,4}; 129 int expected_array[] = {1,4,4,4}; 130 assert(sort_and_compare(test_array, expected_array, 4, test_comparator), "3 duplicates not sorted correctly"); 131 } 132 { 133 int test_array[] = {0,1,2,3,4,5,6,7,8,9}; 134 int expected_array[] = {0,1,2,3,4,5,6,7,8,9}; 135 assert(sort_and_compare(test_array, expected_array, 10, test_comparator), "Already sorted array not correctly sorted"); 136 } 137 { 138 // one of the random arrays that found an issue in the partion method. 139 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}; 140 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}; 141 assert(sort_and_compare(test_array, expected_array, 42, test_comparator), "Not correctly sorted"); 142 } 143 { 144 int test_array[] = {2,8,1,4}; 145 int expected_array[] = {1,4,2,8}; 146 assert(sort_and_compare(test_array, expected_array, 4, test_even_odd_comparator), "Even/odd not sorted correctly"); 147 } 148 { // Some idempotent tests 149 { 150 // An array of lenght 3 is only sorted by find_pivot. Make sure that it is idempotent. 151 int test_array[] = {1,4,8}; 152 int expected_array[] = {1,4,8}; 153 assert(sort_and_compare(test_array, expected_array, 3, test_even_odd_comparator, true), "Even/odd not idempotent"); 154 } 155 { 156 int test_array[] = {1,7,9,4,8,2}; 157 int expected_array[] = {1,7,9,4,8,2}; 158 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 159 } 160 { 161 int test_array[] = {1,9,7,4,2,8}; 162 int expected_array[] = {1,9,7,4,2,8}; 163 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 164 } 165 { 166 int test_array[] = {7,9,1,2,8,4}; 167 int expected_array[] = {7,9,1,2,8,4}; 168 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 169 } 170 { 171 int test_array[] = {7,1,9,2,4,8}; 172 int expected_array[] = {7,1,9,2,4,8}; 173 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 174 } 175 { 176 int test_array[] = {9,1,7,4,8,2}; 177 int expected_array[] = {9,1,7,4,8,2}; 178 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 179 } 180 { 181 int test_array[] = {9,7,1,4,2,8}; 182 int expected_array[] = {9,7,1,4,2,8}; 183 assert(sort_and_compare(test_array, expected_array, 6, test_even_odd_comparator, true), "Even/odd not idempotent"); 184 } 185 } 186 187 // test sorting random arrays 188 for (int i = 0; i < 1000; i++) { 189 int length = os::random() % 100; 190 int* test_array = new int[length]; 191 int* expected_array = new int[length]; 192 for (int j = 0; j < length; j++) { 193 // Choose random values, but get a chance of getting duplicates 194 test_array[j] = os::random() % (length * 2); 195 expected_array[j] = test_array[j]; 196 } 197 198 // Compare sorting to stdlib::qsort() 199 qsort(expected_array, length, sizeof(int), test_stdlib_comparator); 200 assert(sort_and_compare(test_array, expected_array, length, test_comparator), "Random array not correctly sorted"); 201 202 // Make sure sorting is idempotent. 203 // Both test_array and expected_array are sorted by the test_comparator. 204 // Now sort them once with the test_even_odd_comparator. Then sort the 205 // test_array one more time with test_even_odd_comparator and verify that 206 // it is idempotent. 207 sort(expected_array, length, test_even_odd_comparator, true); 208 sort(test_array, length, test_even_odd_comparator, true); 209 assert(compare_arrays(test_array, expected_array, length), "Sorting identical arrays rendered different results"); 210 sort(test_array, length, test_even_odd_comparator, true); 211 assert(compare_arrays(test_array, expected_array, length), "Sorting already sorted array changed order of elements - not idempotent"); 212 213 delete[] test_array; 214 delete[] expected_array; 215 } 216 #endif 217 return true; 218 } 219 220 #endif