arena_test.cc raw

   1  // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style license that can be
   3  // found in the LICENSE file. See the AUTHORS file for names of contributors.
   4  
   5  #include "util/arena.h"
   6  
   7  #include "util/random.h"
   8  #include "util/testharness.h"
   9  
  10  namespace leveldb {
  11  
  12  class ArenaTest {};
  13  
  14  TEST(ArenaTest, Empty) { Arena arena; }
  15  
  16  TEST(ArenaTest, Simple) {
  17    std::vector<std::pair<size_t, char*>> allocated;
  18    Arena arena;
  19    const int N = 100000;
  20    size_t bytes = 0;
  21    Random rnd(301);
  22    for (int i = 0; i < N; i++) {
  23      size_t s;
  24      if (i % (N / 10) == 0) {
  25        s = i;
  26      } else {
  27        s = rnd.OneIn(4000)
  28                ? rnd.Uniform(6000)
  29                : (rnd.OneIn(10) ? rnd.Uniform(100) : rnd.Uniform(20));
  30      }
  31      if (s == 0) {
  32        // Our arena disallows size 0 allocations.
  33        s = 1;
  34      }
  35      char* r;
  36      if (rnd.OneIn(10)) {
  37        r = arena.AllocateAligned(s);
  38      } else {
  39        r = arena.Allocate(s);
  40      }
  41  
  42      for (size_t b = 0; b < s; b++) {
  43        // Fill the "i"th allocation with a known bit pattern
  44        r[b] = i % 256;
  45      }
  46      bytes += s;
  47      allocated.push_back(std::make_pair(s, r));
  48      ASSERT_GE(arena.MemoryUsage(), bytes);
  49      if (i > N / 10) {
  50        ASSERT_LE(arena.MemoryUsage(), bytes * 1.10);
  51      }
  52    }
  53    for (size_t i = 0; i < allocated.size(); i++) {
  54      size_t num_bytes = allocated[i].first;
  55      const char* p = allocated[i].second;
  56      for (size_t b = 0; b < num_bytes; b++) {
  57        // Check the "i"th allocation for the known bit pattern
  58        ASSERT_EQ(int(p[b]) & 0xff, i % 256);
  59      }
  60    }
  61  }
  62  
  63  }  // namespace leveldb
  64  
  65  int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
  66