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 "gtest/gtest.h"
8#include "util/random.h"
9
10namespace leveldb {
11
12TEST(ArenaTest, Empty) { Arena arena; }
13
14TEST(ArenaTest, Simple) {
15 std::vector<std::pair<size_t, char*>> allocated;
16 Arena arena;
17 const int N = 100000;
18 size_t bytes = 0;
19 Random rnd(301);
20 for (int i = 0; i < N; i++) {
21 size_t s;
22 if (i % (N / 10) == 0) {
23 s = i;
24 } else {
25 s = rnd.OneIn(4000)
26 ? rnd.Uniform(6000)
27 : (rnd.OneIn(10) ? rnd.Uniform(100) : rnd.Uniform(20));
28 }
29 if (s == 0) {
30 // Our arena disallows size 0 allocations.
31 s = 1;
32 }
33 char* r;
34 if (rnd.OneIn(10)) {
35 r = arena.AllocateAligned(s);
36 } else {
37 r = arena.Allocate(s);
38 }
39
40 for (size_t b = 0; b < s; b++) {
41 // Fill the "i"th allocation with a known bit pattern
42 r[b] = i % 256;
43 }
44 bytes += s;
45 allocated.push_back(std::make_pair(s, r));
46 ASSERT_GE(arena.MemoryUsage(), bytes);
47 if (i > N / 10) {
48 ASSERT_LE(arena.MemoryUsage(), bytes * 1.10);
49 }
50 }
51 for (size_t i = 0; i < allocated.size(); i++) {
52 size_t num_bytes = allocated[i].first;
53 const char* p = allocated[i].second;
54 for (size_t b = 0; b < num_bytes; b++) {
55 // Check the "i"th allocation for the known bit pattern
56 ASSERT_EQ(int(p[b]) & 0xff, i % 256);
57 }
58 }
59}
60
61} // namespace leveldb
62