src/leveldb/util/arena_test.cc

   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) {
  15   Arena arena;
  16 }
  17
  18 TEST(ArenaTest, Simple) {
  19   std::vector<std::pair<size_t, char*> > allocated;
  20   Arena arena;
  21   const int N = 100000;
  22   size_t bytes = 0;
  23   Random rnd(301);
  24   for (int i = 0; i < N; i++) {
  25     size_t s;
  26     if (i % (N / 10) == 0) {
  27       s = i;
  28     } else {
  29       s = rnd.OneIn(4000) ? rnd.Uniform(6000) :
  30           (rnd.OneIn(10) ? rnd.Uniform(100) : rnd.Uniform(20));
  31     }
  32     if (s == 0) {
  33       // Our arena disallows size 0 allocations.
  34       s = 1;
  35     }
  36     char* r;
  37     if (rnd.OneIn(10)) {
  38       r = arena.AllocateAligned(s);
  39     } else {
  40       r = arena.Allocate(s);
  41     }
  42
  43     for (size_t b = 0; b < s; b++) {
  44       // Fill the "i"th allocation with a known bit pattern
  45       r[b] = i % 256;
  46     }
  47     bytes += s;
  48     allocated.push_back(std::make_pair(s, r));
  49     ASSERT_GE(arena.MemoryUsage(), bytes);
  50     if (i > N/10) {
  51       ASSERT_LE(arena.MemoryUsage(), bytes * 1.10);
  52     }
  53   }
  54   for (size_t i = 0; i < allocated.size(); i++) {
  55     size_t num_bytes = allocated[i].first;
  56     const char* p = allocated[i].second;
  57     for (size_t b = 0; b < num_bytes; b++) {
  58       // Check the "i"th allocation for the known bit pattern
  59       ASSERT_EQ(int(p[b]) & 0xff, i % 256);
  60     }
  61   }
  62 }
  63
  64 }  // namespace leveldb
  65
  66 int main(int argc, char** argv) {
  67   return leveldb::test::RunAllTests();
  68 }