/*

* Copyright (c) Facebook, Inc. and its affiliates.

*

* This source code is licensed under the MIT license found in the

* LICENSE file in the root directory of this source tree.

*/

#if defined(__linux__)

#include "hermes/Support/PageAccessTracker.h"

#include "hermes/Support/OSCompat.h"

#include "gtest/gtest.h"

using namespace hermes;

namespace {

#ifdef HERMES_HAS_REAL_PAGE_TRACKER

TEST(PageAccessTrackerTest, Order) {

const size_t PS = hermes::oscompat::page_size();

const int numPages = 3;

auto result = hermes::oscompat::vm_allocate(PS * numPages);

ASSERT_TRUE(result);

std::unique_ptr<volatile PageAccessTracker> tracker =

PageAccessTracker::create(result.get(), PS * numPages);

auto p = reinterpret_cast<volatile char *>(result.get());

p[1 * PS];

p[2 * PS];

p[0 * PS];

std::string out;

{

llvh::raw_string_ostream OS(out);

tracker->printStats(OS, true);

}

std::string expected = "\"page_ids\":[1,2,0],";

EXPECT_TRUE(out.find(expected) != std::string::npos);

}

#endif

} // namespace

#endif // __linux__