js/src/jsapi-tests/testSharedImmutableStringsCache.cpp
author smolnar <smolnar@mozilla.com>
Sun, 26 Jun 2022 00:27:22 +0300
changeset 622104 a5301180315c5a152c4173e6fc741e02f271d4ed
parent 580036 2102776da1b2340f871ca3e3b008d38b5ad4e84a
permissions -rw-r--r--
Merge autoland to mozilla-central. a=merge

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/IntegerRange.h"

#include "js/Vector.h"
#include "jsapi-tests/tests.h"
#include "threading/Thread.h"
#include "util/Text.h"
#include "vm/SharedImmutableStringsCache.h"

const int NUM_THREADS = 256;
const int NUM_ITERATIONS = 256;

const int NUM_STRINGS = 4;
const char16_t* const STRINGS[NUM_STRINGS] = {u"uno", u"dos", u"tres",
                                              u"quattro"};

struct CacheAndIndex {
  js::SharedImmutableStringsCache* cache;
  int index;

  CacheAndIndex(js::SharedImmutableStringsCache* cache, int index)
      : cache(cache), index(index) {}
};

static void getString(CacheAndIndex* cacheAndIndex) {
  for (int i = 0; i < NUM_ITERATIONS; i++) {
    auto str = STRINGS[cacheAndIndex->index % NUM_STRINGS];

    auto dupe = js::DuplicateString(str);
    MOZ_RELEASE_ASSERT(dupe);

    auto deduped =
        cacheAndIndex->cache->getOrCreate(std::move(dupe), js_strlen(str));
    MOZ_RELEASE_ASSERT(deduped);
    MOZ_RELEASE_ASSERT(
        js::EqualChars(str, deduped.chars(), js_strlen(str) + 1));

    {
      auto cloned = deduped.clone();
      // We should be de-duplicating and giving back the same string.
      MOZ_RELEASE_ASSERT(deduped.chars() == cloned.chars());
    }
  }

  js_delete(cacheAndIndex);
}

BEGIN_TEST(testSharedImmutableStringsCache) {
  auto maybeCache = js::SharedImmutableStringsCache::Create();
  CHECK(maybeCache.isSome());
  auto& cache = *maybeCache;

  js::Vector<js::Thread> threads(cx);
  CHECK(threads.reserve(NUM_THREADS));

  for (auto i : mozilla::IntegerRange(NUM_THREADS)) {
    auto cacheAndIndex = js_new<CacheAndIndex>(&cache, i);
    CHECK(cacheAndIndex);
    threads.infallibleEmplaceBack();
    CHECK(threads.back().init(getString, cacheAndIndex));
  }

  for (auto& thread : threads) {
    thread.join();
  }

  return true;
}
END_TEST(testSharedImmutableStringsCache)