test-example-projects/c++_projects/280w-mysql-8.0.18/unittest/gunit/innodb/mem0mem-t.cc

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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

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   as designated in a particular file or component or in included license
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   This program is distributed in the hope that it will be useful,
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

/* See http://code.google.com/p/googletest/wiki/Primer */

// First include (the generated) my_config.h, to get correct platform defines.
#include "my_config.h"

#include <gtest/gtest.h>
#include <stddef.h>

#include "sql/handler.h"
#include "storage/innobase/include/mem0mem.h"
#include "storage/innobase/include/os0event.h"
#include "storage/innobase/include/srv0conc.h"
#include "storage/innobase/include/srv0srv.h"
#include "storage/innobase/include/univ.i"

namespace innodb_mem0mem_unittest {

class mem0mem : public ::testing::Test {
 protected:
  static void SetUpTestCase() {
    srv_max_n_threads = srv_sync_array_size + 1;
    os_event_global_init();
    sync_check_init(srv_max_n_threads);
  }
  static void TearDownTestCase() {
    sync_check_close();
    os_event_global_destroy();
  }
};

/* test mem_heap_is_top() */
TEST_F(mem0mem, memheapistop) {
  mem_heap_t *heap;
  const char *str = "aabbccddeeff";
  size_t str_len = strlen(str);
  char *str_in_heap;
  void *dummy;

#define INITIAL_HEAP_SIZE 512

  heap = mem_heap_create(INITIAL_HEAP_SIZE);

  str_in_heap = mem_heap_strdup(heap, str);

  EXPECT_TRUE(mem_heap_is_top(heap, str_in_heap, str_len + 1));

  /* Check with a random pointer to make sure that mem_heap_is_top()
  does not return true unconditionally. */
  EXPECT_FALSE(mem_heap_is_top(heap, "foo", 4));

  /* Allocate another chunk and check that our string is not at the
  top anymore. */
  dummy = mem_heap_alloc(heap, 32);
  ut_a(dummy != NULL);
  EXPECT_FALSE(mem_heap_is_top(heap, str_in_heap, str_len + 1));

  /* Cause the heap to allocate a second block and retest. */
  dummy = mem_heap_alloc(heap, INITIAL_HEAP_SIZE + 1);
  str_in_heap = mem_heap_strdup(heap, str);
  EXPECT_TRUE(mem_heap_is_top(heap, str_in_heap, str_len + 1));

  /* Allocate another chunk, free it, and then confirm that our string
  is still the topmost element. */
  const ulint x = 64;
  dummy = mem_heap_alloc(heap, x);
  EXPECT_FALSE(mem_heap_is_top(heap, str_in_heap, str_len + 1));
  mem_heap_free_top(heap, x);
  EXPECT_TRUE(mem_heap_is_top(heap, str_in_heap, str_len + 1));

  mem_heap_free(heap);
}

/* test mem_heap_replace() */
TEST_F(mem0mem, memheapreplace) {
  mem_heap_t *heap;
  void *p1;
  const ulint p1_size = 16;
  void *p2;
  const ulint p2_size = 32;
  void *p3;
  const ulint p3_size = 64;
  void *p4;
  const ulint p4_size = 128;
  void *p5;
  const ulint p5_size = 256;

  heap = mem_heap_create(1024);

  p1 = mem_heap_alloc(heap, p1_size);
  p2 = mem_heap_alloc(heap, p2_size);
  p3 = mem_heap_replace(heap, p1, p1_size, p3_size);

  EXPECT_NE(p2, p3);
  EXPECT_TRUE(mem_heap_is_top(heap, p3, p3_size));

  p4 = mem_heap_replace(heap, p3, p3_size, p4_size);

  EXPECT_EQ(p3, p4);
  EXPECT_TRUE(mem_heap_is_top(heap, p4, p4_size));

  p5 = mem_heap_replace(heap, p4, p4_size - 5, p5_size);

#ifdef UNIV_MEM_DEBUG
  /* In UNIV_MEM_DEBUG we need to specify the correct size of the
  old top in order for it to get replaced. */
  EXPECT_NE(p4, p5);
#else  /* UNIV_MEM_DEBUG */
  EXPECT_EQ(p4, p5);
#endif /* UNIV_MEM_DEBUG */
  EXPECT_TRUE(mem_heap_is_top(heap, p5, p5_size));

  mem_heap_free(heap);
}

}  // namespace innodb_mem0mem_unittest