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  1. /*
  2.  * Copyright (c) 2007 Vojtech Mencl
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <test.h>
  30. #include <print.h>
  31. #include <adt/avl.h>
  32. #include <debug.h>
  33. #include <arch/types.h>
  34.  
  35. #define NODE_COUNT 100
  36.  
  37. static avltree_t avltree;
  38.  
  39. /*
  40.  * avl tree nodes in array for faster allocation
  41.  */
  42. static avltree_node_t avltree_nodes[NODE_COUNT];
  43.  
  44. /*
  45.  * head of free nodes' list:
  46.  */
  47. static avltree_node_t *first_free_node = NULL;
  48.  
  49. static int test_tree_balance(avltree_node_t *node);
  50. static avltree_node_t *test_tree_parents(avltree_node_t *node);
  51. static void print_tree_structure_flat (avltree_node_t *node, int level);
  52. static avltree_node_t *alloc_avltree_node(void);
  53.  
  54. static avltree_node_t *test_tree_parents(avltree_node_t *node)
  55. {
  56.     avltree_node_t *tmp;
  57.    
  58.     if (!node)
  59.         return NULL;
  60.  
  61.     if (node->lft) {
  62.         tmp = test_tree_parents(node->lft);
  63.         if (tmp != node) {
  64.             printf("Bad parent pointer key: %d, address: %p\n",
  65.                 tmp->key, node->lft);
  66.         }
  67.     }
  68.     if (node->rgt) {
  69.         tmp = test_tree_parents(node->rgt);
  70.         if (tmp != node) {
  71.             printf("Bad parent pointer key: %d, address: %p\n",
  72.                 tmp->key,node->rgt);
  73.         }
  74.     }
  75.     return node->par;
  76. }
  77.  
  78. int test_tree_balance(avltree_node_t *node)
  79. {
  80.     int h1, h2, diff;
  81.  
  82.     if (!node)
  83.         return 0;
  84.     h1 = test_tree_balance(node->lft);
  85.     h2 = test_tree_balance(node->rgt);
  86.     diff = h2 - h1;
  87.     if (diff != node->balance || (diff != -1 && diff != 0 && diff != 1)) {
  88.         printf("Bad balance\n");
  89.     }
  90.     return h1 > h2 ? h1 + 1 : h2 + 1;
  91. }
  92.  
  93. /**
  94.  * Prints the structure of the node, which is level levels from the top of the
  95.  * tree.
  96.  */
  97. static void print_tree_structure_flat(avltree_node_t *node, int level)
  98. {
  99.     /*
  100.      * You can set the maximum level as high as you like.
  101.          * Most of the time, you'll want to debug code using small trees,
  102.          * so that a large level indicates a loop, which is a bug.
  103.      */
  104.     if (level > 16) {
  105.         printf("[...]");
  106.         return;
  107.     }
  108.  
  109.     if (node == NULL)
  110.         return;
  111.  
  112.     printf("%d[%d]", node->key, node->balance);
  113.     if (node->lft != NULL || node->rgt != NULL) {
  114.         printf("(");
  115.  
  116.         print_tree_structure_flat(node->lft, level + 1);
  117.         if (node->rgt != NULL) {
  118.             printf(",");
  119.             print_tree_structure_flat(node->rgt, level + 1);
  120.         }
  121.  
  122.         printf(")");
  123.     }
  124. }
  125.  
  126. static void alloc_avltree_node_prepare(void)
  127. {
  128.     int i;
  129.  
  130.     for (i = 0; i < NODE_COUNT - 1; i++) {
  131.         avltree_nodes[i].par = &avltree_nodes[i + 1];
  132.     }
  133.    
  134.     /*
  135.      * Node keys which will be used for insertion. Up to NODE_COUNT size of
  136.      * array.
  137.      */
  138.  
  139.     /* First tree node and same key */
  140.     avltree_nodes[0].key = 60;
  141.     avltree_nodes[1].key = 60;
  142.     avltree_nodes[2].key = 60;
  143.     /* LL rotation */
  144.     avltree_nodes[3].key = 50;
  145.     avltree_nodes[4].key = 40;
  146.     avltree_nodes[5].key = 30;
  147.     /* LR rotation */
  148.     avltree_nodes[6].key = 20;
  149.     avltree_nodes[7].key = 20;
  150.     avltree_nodes[8].key = 25;
  151.     avltree_nodes[9].key = 25;
  152.     /* LL rotation in lower floor */
  153.     avltree_nodes[10].key = 35;
  154.     /* RR rotation */
  155.     avltree_nodes[11].key = 70;
  156.     avltree_nodes[12].key = 80;
  157.     /* RL rotation */
  158.     avltree_nodes[13].key = 90;
  159.     avltree_nodes[14].key = 85;
  160.     /* Insert 0 key */
  161.     avltree_nodes[15].key = 0;
  162.     avltree_nodes[16].key = 0;
  163.     /* Insert reverse */
  164.     avltree_nodes[17].key = 600;
  165.     avltree_nodes[18].key = 500;
  166.     avltree_nodes[19].key = 400;
  167.     avltree_nodes[20].key = 300;
  168.  
  169.     for (i = 21; i < NODE_COUNT; i++)
  170.         avltree_nodes[i].key = i * 3;
  171.    
  172.     avltree_nodes[i].par = NULL;
  173.     first_free_node = &avltree_nodes[0];
  174. }
  175.  
  176. static avltree_node_t *alloc_avltree_node(void)
  177. {
  178.     avltree_node_t *node;
  179.  
  180.     node = first_free_node;
  181.     first_free_node = first_free_node->par;
  182.  
  183.     return node;
  184. }
  185.  
  186. static void test_tree_insert(avltree_t *tree, count_t node_count, bool quiet)
  187. {
  188.     unsigned int i;
  189.     avltree_node_t *newnode;
  190.  
  191.     avltree_create(tree);
  192.    
  193.     if (!quiet)
  194.         printf("Inserting %d nodes...", node_count);
  195.  
  196.     for (i = 0; i < node_count; i++) {
  197.         newnode = alloc_avltree_node();
  198.        
  199.         avltree_insert(tree, newnode);
  200.         if (!quiet) {
  201.             test_tree_parents(tree->root);
  202.             test_tree_balance(tree->root);
  203.         }
  204.     }
  205.        
  206.     if (!quiet)
  207.         printf("done.\n");
  208. }
  209.  
  210.  
  211. static void test_tree_delete(avltree_t *tree, count_t node_count,
  212.     int node_position, bool quiet)
  213. {
  214.     avltree_node_t *delnode;
  215.     unsigned int i;
  216.    
  217.     switch (node_position) {
  218.     case 0:
  219.         if (!quiet)
  220.             printf("Deleting root nodes...");
  221.         while (tree->root != NULL) {
  222.             delnode = tree->root;
  223.             avltree_delete(tree, delnode);
  224.             if (!quiet) {
  225.                 test_tree_parents(tree->root);
  226.                 test_tree_balance(tree->root);
  227.             }
  228.         }
  229.         break;
  230.     case 1:
  231.         if (!quiet)
  232.             printf("Deleting nodes according to creation time...");
  233.         for (i = 0; i < node_count; i++) {
  234.             avltree_delete(tree, &avltree_nodes[i]);
  235.             if (!quiet) {
  236.                 test_tree_parents(tree->root);
  237.                 test_tree_balance(tree->root);
  238.             }
  239.         }
  240.         break; 
  241.     }
  242.    
  243.     if (!quiet)
  244.         printf("done.\n");
  245. }
  246.  
  247. static void test_tree_delmin(avltree_t *tree, count_t node_count, bool quiet)
  248. {
  249.     int i = 0;
  250.    
  251.     if (!quiet)
  252.         printf("Deleting minimum nodes...");
  253.    
  254.     while (tree->root != NULL) {
  255.         i++;
  256.         avltree_delete_min(tree);
  257.         if (!quiet) {
  258.             test_tree_parents(tree->root);
  259.             test_tree_balance(tree->root);
  260.         }
  261.     }
  262.  
  263.     if (!quiet && (i != node_count))
  264.         printf("Bad node count. Some nodes have been lost!\n");
  265.  
  266.     if (!quiet)
  267.         printf("done.\n");
  268. }
  269.  
  270. char *test_avltree1(bool quiet)
  271. {
  272.     alloc_avltree_node_prepare();
  273.     test_tree_insert(&avltree, NODE_COUNT, quiet);
  274.     test_tree_delete(&avltree, NODE_COUNT, 0, quiet);
  275.  
  276.     alloc_avltree_node_prepare();
  277.     test_tree_insert(&avltree, NODE_COUNT, quiet);
  278.     test_tree_delete(&avltree, NODE_COUNT, 1, quiet);
  279.  
  280.     alloc_avltree_node_prepare();
  281.     test_tree_insert(&avltree, NODE_COUNT, quiet);
  282.     test_tree_delmin(&avltree, NODE_COUNT, quiet);
  283.  
  284.     return NULL;
  285. }
  286.  
  287.