| /* Fibonacci heap for GNU compiler. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| Contributed by Martin Liska <mliska@suse.cz> |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC 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 |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "fibonacci_heap.h" |
| #include "selftest.h" |
| |
| #if CHECKING_P |
| |
| namespace selftest { |
| |
| /* Selftests. */ |
| |
| /* Verify that operations with empty heap work. */ |
| |
| typedef fibonacci_node <int, int> int_heap_node_t; |
| typedef fibonacci_heap <int, int> int_heap_t; |
| |
| static void |
| test_empty_heap () |
| { |
| int_heap_t *h1 = new int_heap_t (INT_MIN); |
| |
| ASSERT_TRUE (h1->empty ()); |
| ASSERT_EQ (0, h1->nodes ()); |
| ASSERT_EQ (NULL, h1->min ()); |
| |
| int_heap_t *h2 = new int_heap_t (INT_MIN); |
| |
| int_heap_t *r = h1->union_with (h2); |
| ASSERT_TRUE (r->empty ()); |
| ASSERT_EQ (0, r->nodes ()); |
| ASSERT_EQ (NULL, r->min ()); |
| |
| delete r; |
| } |
| |
| #define TEST_HEAP_N 100 |
| #define TEST_CALCULATE_VALUE(i) ((3 * i) + 10000) |
| |
| /* Verify heap basic operations. */ |
| |
| static void |
| test_basic_heap_operations () |
| { |
| int values[TEST_HEAP_N]; |
| int_heap_t *h1 = new int_heap_t (INT_MIN); |
| |
| for (unsigned i = 0; i < TEST_HEAP_N; i++) |
| { |
| values[i] = TEST_CALCULATE_VALUE (i); |
| ASSERT_EQ (i, h1->nodes ()); |
| h1->insert (i, &values[i]); |
| ASSERT_EQ (0, h1->min_key ()); |
| ASSERT_EQ (values[0], *h1->min ()); |
| } |
| |
| for (unsigned i = 0; i < TEST_HEAP_N; i++) |
| { |
| ASSERT_EQ (TEST_HEAP_N - i, h1->nodes ()); |
| ASSERT_EQ ((int)i, h1->min_key ()); |
| ASSERT_EQ (values[i], *h1->min ()); |
| |
| h1->extract_min (); |
| } |
| |
| ASSERT_TRUE (h1->empty ()); |
| |
| delete h1; |
| } |
| |
| /* Builds a simple heap with values in interval 0..TEST_HEAP_N-1, where values |
| of each key is equal to 3 * key + 10000. BUFFER is used as a storage |
| of values and NODES points to inserted nodes. */ |
| |
| static int_heap_t * |
| build_simple_heap (int *buffer, int_heap_node_t **nodes) |
| { |
| int_heap_t *h = new int_heap_t (INT_MIN); |
| |
| for (unsigned i = 0; i < TEST_HEAP_N; i++) |
| { |
| buffer[i] = TEST_CALCULATE_VALUE (i); |
| nodes[i] = h->insert (i, &buffer[i]); |
| } |
| |
| return h; |
| } |
| |
| /* Verify that fibonacci_heap::replace_key works. */ |
| |
| static void |
| test_replace_key () |
| { |
| int values[TEST_HEAP_N]; |
| int_heap_node_t *nodes[TEST_HEAP_N]; |
| |
| int_heap_t *heap = build_simple_heap (values, nodes); |
| |
| int N = 10; |
| for (unsigned i = 0; i < (unsigned)N; i++) |
| heap->replace_key (nodes[i], 100 * 1000 + i); |
| |
| ASSERT_EQ (TEST_HEAP_N, heap->nodes ()); |
| ASSERT_EQ (N, heap->min_key ()); |
| ASSERT_EQ (TEST_CALCULATE_VALUE (N), *heap->min ()); |
| |
| for (int i = 0; i < TEST_HEAP_N - 1; i++) |
| heap->extract_min (); |
| |
| ASSERT_EQ (1, heap->nodes ()); |
| ASSERT_EQ (100 * 1000 + N - 1, heap->min_key ()); |
| |
| delete heap; |
| } |
| |
| /* Verify that heap can handle duplicate keys. */ |
| |
| static void |
| test_duplicate_keys () |
| { |
| int values[3 * TEST_HEAP_N]; |
| int_heap_t *heap = new int_heap_t (INT_MIN); |
| |
| for (unsigned i = 0; i < 3 * TEST_HEAP_N; i++) |
| { |
| values[i] = TEST_CALCULATE_VALUE (i); |
| heap->insert (i / 3, &values[i]); |
| } |
| |
| ASSERT_EQ (3 * TEST_HEAP_N, heap->nodes ()); |
| ASSERT_EQ (0, heap->min_key ()); |
| ASSERT_EQ (TEST_CALCULATE_VALUE (0), *heap->min ()); |
| |
| for (unsigned i = 0; i < 9; i++) |
| heap->extract_min (); |
| |
| for (unsigned i = 0; i < 3; i++) |
| { |
| ASSERT_EQ (3, heap->min_key ()); |
| heap->extract_min (); |
| } |
| |
| delete heap; |
| } |
| |
| /* Verify that heap can handle union. */ |
| |
| static void |
| test_union () |
| { |
| int value = 777; |
| |
| int_heap_t *heap1 = new int_heap_t (INT_MIN); |
| for (unsigned i = 0; i < 2 * TEST_HEAP_N; i++) |
| heap1->insert (i, &value); |
| |
| int_heap_t *heap2 = new int_heap_t (INT_MIN); |
| for (unsigned i = 2 * TEST_HEAP_N; i < 3 * TEST_HEAP_N; i++) |
| heap2->insert (i, &value); |
| |
| int_heap_t *union_heap = heap1->union_with (heap2); |
| |
| for (int i = 0; i < 3 * TEST_HEAP_N; i++) |
| { |
| ASSERT_EQ (i, union_heap->min_key ()); |
| union_heap->extract_min (); |
| } |
| |
| delete union_heap; |
| } |
| |
| /* Verify that heap can handle union with a heap having exactly the same |
| keys. */ |
| |
| static void |
| test_union_of_equal_heaps () |
| { |
| int value = 777; |
| |
| int_heap_t *heap1 = new int_heap_t (INT_MIN); |
| for (unsigned i = 0; i < TEST_HEAP_N; i++) |
| heap1->insert (i, &value); |
| |
| int_heap_t *heap2 = new int_heap_t (INT_MIN); |
| for (unsigned i = 0; i < TEST_HEAP_N; i++) |
| heap2->insert (i, &value); |
| |
| int_heap_t *union_heap = heap1->union_with (heap2); |
| |
| for (int i = 0; i < TEST_HEAP_N; i++) |
| for (int j = 0; j < 2; j++) |
| { |
| ASSERT_EQ (i, union_heap->min_key ()); |
| union_heap->extract_min (); |
| } |
| |
| delete union_heap; |
| } |
| |
| /* Dummy struct for testing. */ |
| |
| struct heap_key |
| { |
| heap_key (int k): key (k) |
| { |
| } |
| |
| int key; |
| |
| bool operator< (const heap_key &other) const |
| { |
| return key > other.key; |
| } |
| |
| bool operator== (const heap_key &other) const |
| { |
| return key == other.key; |
| } |
| |
| bool operator> (const heap_key &other) const |
| { |
| return !(*this == other || *this < other); |
| } |
| }; |
| |
| typedef fibonacci_heap<heap_key, int> class_fibonacci_heap_t; |
| |
| /* Verify that heap can handle a struct as key type. */ |
| |
| static void |
| test_struct_key () |
| { |
| int value = 123456; |
| class_fibonacci_heap_t *heap = new class_fibonacci_heap_t (INT_MIN); |
| |
| heap->insert (heap_key (1), &value); |
| heap->insert (heap_key (10), &value); |
| heap->insert (heap_key (100), &value); |
| heap->insert (heap_key (1000), &value); |
| |
| ASSERT_EQ (1000, heap->min_key ().key); |
| ASSERT_EQ (4, heap->nodes ()); |
| heap->extract_min (); |
| heap->extract_min (); |
| ASSERT_EQ (10, heap->min_key ().key); |
| heap->extract_min (); |
| ASSERT_EQ (&value, heap->min ()); |
| heap->extract_min (); |
| ASSERT_TRUE (heap->empty ()); |
| |
| delete heap; |
| } |
| |
| /* Run all of the selftests within this file. */ |
| |
| void |
| fibonacci_heap_c_tests () |
| { |
| test_empty_heap (); |
| test_basic_heap_operations (); |
| test_replace_key (); |
| test_duplicate_keys (); |
| test_union (); |
| test_union_of_equal_heaps (); |
| test_struct_key (); |
| } |
| |
| } // namespace selftest |
| |
| #endif /* #if CHECKING_P */ |