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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.     __attribute__ ((used));
  53. static avltree_node_t *alloc_avltree_node(void);
  54.  
  55. static avltree_node_t *test_tree_parents(avltree_node_t *node)
  56. {
  57.     avltree_node_t *tmp;
  58.    
  59.     if (!node)
  60.         return NULL;
  61.    
  62.     if (node->lft) {
  63.         tmp = test_tree_parents(node->lft);
  64.         if (tmp != node) {
  65.             TPRINTF("Bad parent pointer key: %" PRIu64
  66.                 ", address: %p\n", tmp->key, node->lft);
  67.         }
  68.     }
  69.     if (node->rgt) {
  70.         tmp = test_tree_parents(node->rgt);
  71.         if (tmp != node) {
  72.             TPRINTF("Bad parent pointer key: %" PRIu64
  73.                 ", address: %p\n",
  74.                 tmp->key,node->rgt);
  75.         }
  76.     }
  77.     return node->par;
  78. }
  79.  
  80. int test_tree_balance(avltree_node_t *node)
  81. {
  82.     int h1, h2, diff;
  83.    
  84.     if (!node)
  85.         return 0;
  86.    
  87.     h1 = test_tree_balance(node->lft);
  88.     h2 = test_tree_balance(node->rgt);
  89.     diff = h2 - h1;
  90.    
  91.     if ((diff != node->balance) || ((diff != -1) && (diff != 0) && (diff != 1)))
  92.         TPRINTF("Bad balance\n");
  93.    
  94.     return ((h1 > h2) ? (h1 + 1) : (h2 + 1));
  95. }
  96.  
  97. /**
  98.  * Prints the structure of the node, which is level levels from the top of the
  99.  * tree.
  100.  */
  101. static void print_tree_structure_flat(avltree_node_t *node, int level)
  102. {
  103.     /*
  104.      * You can set the maximum level as high as you like.
  105.      * Most of the time, you'll want to debug code using small trees,
  106.      * so that a large level indicates a loop, which is a bug.
  107.      */
  108.     if (level > 16) {
  109.         TPRINTF("[...]");
  110.         return;
  111.     }
  112.    
  113.     if (node == NULL)
  114.         return;
  115.    
  116.     TPRINTF("%" PRIu64 "[%" PRIu8 "]", node->key, node->balance);
  117.     if (node->lft != NULL || node->rgt != NULL) {
  118.         TPRINTF("(");
  119.        
  120.         print_tree_structure_flat(node->lft, level + 1);
  121.         if (node->rgt != NULL) {
  122.             TPRINTF(",");
  123.             print_tree_structure_flat(node->rgt, level + 1);
  124.         }
  125.        
  126.         TPRINTF(")");
  127.     }
  128. }
  129.  
  130. static void alloc_avltree_node_prepare(void)
  131. {
  132.     int i;
  133.    
  134.     for (i = 0; i < NODE_COUNT - 1; i++)
  135.         avltree_nodes[i].par = &avltree_nodes[i + 1];
  136.    
  137.     avltree_nodes[i].par = NULL;
  138.    
  139.     /*
  140.      * Node keys which will be used for insertion. Up to NODE_COUNT size of
  141.      * array.
  142.      */
  143.    
  144.     /* First tree node and same key */
  145.     avltree_nodes[0].key = 60;
  146.     avltree_nodes[1].key = 60;
  147.     avltree_nodes[2].key = 60;
  148.    
  149.     /* LL rotation */
  150.     avltree_nodes[3].key = 50;
  151.     avltree_nodes[4].key = 40;
  152.     avltree_nodes[5].key = 30;
  153.    
  154.     /* LR rotation */
  155.     avltree_nodes[6].key = 20;
  156.     avltree_nodes[7].key = 20;
  157.     avltree_nodes[8].key = 25;
  158.     avltree_nodes[9].key = 25;
  159.    
  160.     /* LL rotation in lower floor */
  161.     avltree_nodes[10].key = 35;
  162.    
  163.     /* RR rotation */
  164.     avltree_nodes[11].key = 70;
  165.     avltree_nodes[12].key = 80;
  166.    
  167.     /* RL rotation */
  168.     avltree_nodes[13].key = 90;
  169.     avltree_nodes[14].key = 85;
  170.    
  171.     /* Insert 0 key */
  172.     avltree_nodes[15].key = 0;
  173.     avltree_nodes[16].key = 0;
  174.    
  175.     /* Insert reverse */
  176.     avltree_nodes[17].key = 600;
  177.     avltree_nodes[18].key = 500;
  178.     avltree_nodes[19].key = 400;
  179.     avltree_nodes[20].key = 300;
  180.    
  181.     for (i = 21; i < NODE_COUNT; i++)
  182.         avltree_nodes[i].key = i * 3;
  183.    
  184.     first_free_node = &avltree_nodes[0];
  185. }
  186.  
  187. static avltree_node_t *alloc_avltree_node(void)
  188. {
  189.     avltree_node_t *node;
  190.    
  191.     node = first_free_node;
  192.     first_free_node = first_free_node->par;
  193.    
  194.     return node;
  195. }
  196.  
  197. static void test_tree_insert(avltree_t *tree, size_t node_count)
  198. {
  199.     unsigned int i;
  200.     avltree_node_t *newnode;
  201.    
  202.     avltree_create(tree);
  203.    
  204.     TPRINTF("Inserting %" PRIs " nodes...", node_count);
  205.    
  206.     for (i = 0; i < node_count; i++) {
  207.         newnode = alloc_avltree_node();
  208.        
  209.         avltree_insert(tree, newnode);
  210.         test_tree_parents(tree->root);
  211.         test_tree_balance(tree->root);
  212.     }
  213.    
  214.     TPRINTF("done.\n");
  215. }
  216.  
  217. static void test_tree_delete(avltree_t *tree, size_t node_count,
  218.     int node_position)
  219. {
  220.     avltree_node_t *delnode;
  221.     unsigned int i;
  222.    
  223.     switch (node_position) {
  224.     case 0:
  225.         TPRINTF("Deleting root nodes...");
  226.        
  227.         while (tree->root != NULL) {
  228.             delnode = tree->root;
  229.             avltree_delete(tree, delnode);
  230.             test_tree_parents(tree->root);
  231.             test_tree_balance(tree->root);
  232.         }
  233.         break;
  234.     case 1:
  235.         TPRINTF("Deleting nodes according to creation time...");
  236.        
  237.         for (i = 0; i < node_count; i++) {
  238.             avltree_delete(tree, &avltree_nodes[i]);
  239.             test_tree_parents(tree->root);
  240.             test_tree_balance(tree->root);
  241.         }
  242.         break;
  243.     }
  244.    
  245.     TPRINTF("done.\n");
  246. }
  247.  
  248. static void test_tree_delmin(avltree_t *tree, size_t node_count)
  249. {
  250.     unsigned int i = 0;
  251.    
  252.     TPRINTF("Deleting minimum nodes...");
  253.    
  254.     while (tree->root != NULL) {
  255.         i++;
  256.         avltree_delete_min(tree);
  257.         test_tree_parents(tree->root);
  258.         test_tree_balance(tree->root);
  259.     }
  260.    
  261.     if (i != node_count)
  262.         TPRINTF("Bad node count. Some nodes have been lost!\n");
  263.    
  264.     TPRINTF("done.\n");
  265. }
  266.  
  267. char *test_avltree1(void)
  268. {
  269.     alloc_avltree_node_prepare();
  270.     test_tree_insert(&avltree, NODE_COUNT);
  271.     test_tree_delete(&avltree, NODE_COUNT, 0);
  272.    
  273.     alloc_avltree_node_prepare();
  274.     test_tree_insert(&avltree, NODE_COUNT);
  275.     test_tree_delete(&avltree, NODE_COUNT, 1);
  276.    
  277.     alloc_avltree_node_prepare();
  278.     test_tree_insert(&avltree, NODE_COUNT);
  279.     test_tree_delmin(&avltree, NODE_COUNT);
  280.    
  281.     return NULL;
  282. }
  283.