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
10namespace leveldb {
11
12class ArenaTest { };
13
14TEST(ArenaTest, Empty) {
15  Arena arena;
16}
17
18TEST(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
66int main(int argc, char** argv) {
67  return leveldb::test::RunAllTests();
68}
69