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// 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 "gtest/gtest.h"
#include "util/random.h"
namespace leveldb {
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 leveldb
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