git / moonbite-core / src/leveldb/util/arena_test.cc · raw

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.// Use of this source code is governed by a BSD-style license that can be// found in the LICENSE file. See the AUTHORS file for names of contributors.#include "util/arena.h"#include "util/random.h"#include "util/testharness.h"namespace leveldb {class ArenaTest {};TEST(ArenaTest, Empty) { Arena arena; }TEST(ArenaTest, Simple) {  std::vector<std::pair<size_t, char*>> allocated;  Arena arena;  const int N = 100000;  size_t bytes = 0;  Random rnd(301);  for (int i = 0; i < N; i++) {    size_t s;    if (i % (N / 10) == 0) {      s = i;    } else {      s = rnd.OneIn(4000)              ? rnd.Uniform(6000)              : (rnd.OneIn(10) ? rnd.Uniform(100) : rnd.Uniform(20));    }    if (s == 0) {      // Our arena disallows size 0 allocations.      s = 1;    }    char* r;    if (rnd.OneIn(10)) {      r = arena.AllocateAligned(s);    } else {      r = arena.Allocate(s);    }    for (size_t b = 0; b < s; b++) {      // Fill the "i"th allocation with a known bit pattern      r[b] = i % 256;    }    bytes += s;    allocated.push_back(std::make_pair(s, r));    ASSERT_GE(arena.MemoryUsage(), bytes);    if (i > N / 10) {      ASSERT_LE(arena.MemoryUsage(), bytes * 1.10);    }  }  for (size_t i = 0; i < allocated.size(); i++) {    size_t num_bytes = allocated[i].first;    const char* p = allocated[i].second;    for (size_t b = 0; b < num_bytes; b++) {      // Check the "i"th allocation for the known bit pattern      ASSERT_EQ(int(p[b]) & 0xff, i % 256);    }  }}}  // namespace leveldbint main(int argc, char** argv) { return leveldb::test::RunAllTests(); }