Make SharedBuffer in Resource non-discardable and remove PurgeableVector

third_party/WebKit/Source/platform/PurgeableVectorTest.cpp

-/*
- * Copyright (C) 2014 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "platform/PurgeableVector.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "wtf/Vector.h"
-#include <algorithm>
-#include <cstdlib>
-
-namespace blink {
-
-const size_t kTestSize = 32 * 1024;
-
-class PurgeableVectorTestWithDiscardableMemory : public testing::TestWithParam<PurgeableVector::PurgeableOption> {
-};
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, grow)
-{
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.grow(kTestSize);
-    ASSERT_EQ(kTestSize, purgeableVector.size());
-    // Make sure the underlying buffer was actually (re)allocated.
-    memset(purgeableVector.data(), 0, purgeableVector.size());
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, clear)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.append(testData.data(), testData.size());
-    EXPECT_EQ(testData.size(), purgeableVector.size());
-
-    purgeableVector.clear();
-    EXPECT_EQ(0U, purgeableVector.size());
-    EXPECT_EQ(0, purgeableVector.data());
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, reserveCapacityDoesNotChangeSize)
-{
-    PurgeableVector purgeableVector(GetParam());
-    EXPECT_EQ(0U, purgeableVector.size());
-    purgeableVector.reserveCapacity(kTestSize);
-    EXPECT_EQ(0U, purgeableVector.size());
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, multipleAppends)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(GetParam());
-    // Force an allocation.
-    const char kSmallString[] = "hello";
-    purgeableVector.append(kSmallString, sizeof(kSmallString));
-    const char* const data = purgeableVector.data();
-
-    // Append all the testing data in 4 iterations. The |data| pointer should
-    // have been changed at the end of the unit test due to reallocations.
-    const size_t kIterationCount = 4;
-    ASSERT_EQ(0U, testData.size() % kIterationCount);
-    for (size_t i = 0; i < kIterationCount; ++i) {
-        const char* const testDataStart = testData.data() + i * (testData.size() / kIterationCount);
-        purgeableVector.append(testDataStart, testData.size() / kIterationCount);
-        ASSERT_EQ((i + 1) * testData.size() / kIterationCount, purgeableVector.size() - sizeof(kSmallString));
-    }
-
-    ASSERT_EQ(sizeof(kSmallString) + testData.size(), purgeableVector.size());
-    EXPECT_NE(data, purgeableVector.data());
-    EXPECT_EQ(0, memcmp(purgeableVector.data() + sizeof(kSmallString), testData.data(), testData.size()));
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, multipleAppendsAfterReserveCapacity)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.reserveCapacity(testData.size());
-    const char* const data = purgeableVector.data();
-
-    // The |data| pointer should be unchanged at the end of the unit test
-    // meaning that there should not have been any reallocation.
-    const size_t kIterationCount = 4;
-    ASSERT_EQ(0U, testData.size() % kIterationCount);
-    for (size_t i = 0; i < kIterationCount; ++i) {
-        const char* const testDataStart = testData.data() + i * (testData.size() / kIterationCount);
-        purgeableVector.append(testDataStart, testData.size() / kIterationCount);
-        ASSERT_EQ((i + 1) * testData.size() / kIterationCount, purgeableVector.size());
-    }
-
-    ASSERT_EQ(testData.size(), purgeableVector.size());
-    EXPECT_EQ(data, purgeableVector.data());
-    EXPECT_EQ(0, memcmp(purgeableVector.data(), testData.data(), testData.size()));
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, reserveCapacityUsesExactCapacityWhenVectorIsEmpty)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.reserveCapacity(kTestSize);
-    const char* const data = purgeableVector.data();
-
-    purgeableVector.append(testData.data(), testData.size());
-    EXPECT_EQ(data, purgeableVector.data());
-    EXPECT_EQ(0, memcmp(purgeableVector.data(), testData.data(), testData.size()));
-
-    // This test is not reliable if the PurgeableVector uses a plain WTF::Vector
-    // for storage, as it does if discardable memory is not supported; the vectors
-    // capacity will always be expanded to fill the PartitionAlloc bucket.
-    if (GetParam() == PurgeableVector::Purgeable) {
-        // Appending one extra byte should cause a reallocation since the first
-        // allocation happened while the purgeable vector was empty. This behavior
-        // helps us guarantee that there is no memory waste on very small vectors
-        // (which SharedBuffer requires).
-        purgeableVector.append(testData.data(), 1);
-        EXPECT_NE(data, purgeableVector.data());
-    }
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, appendReservesCapacityIfNeeded)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(GetParam());
-    // No reserveCapacity().
-    ASSERT_FALSE(purgeableVector.data());
-
-    purgeableVector.append(testData.data(), testData.size());
-    ASSERT_EQ(testData.size(), purgeableVector.size());
-    ASSERT_EQ(0, memcmp(purgeableVector.data(), testData.data(), testData.size()));
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, adopt)
-{
-    Vector<char> testData(kTestSize);
-    std::generate(testData.begin(), testData.end(), &std::rand);
-    const Vector<char> testDataCopy(testData);
-    const char* const testDataPtr = testData.data();
-
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.adopt(testData);
-    EXPECT_TRUE(testData.isEmpty());
-    EXPECT_EQ(kTestSize, purgeableVector.size());
-    ASSERT_EQ(0, memcmp(purgeableVector.data(), testDataCopy.data(), testDataCopy.size()));
-
-    if (GetParam() == PurgeableVector::Purgeable) {
-        // An extra discardable memory allocation + memcpy() should have happened.
-        EXPECT_NE(testDataPtr, purgeableVector.data());
-    } else {
-        // Vector::swap() should have been used.
-        EXPECT_EQ(testDataPtr, purgeableVector.data());
-    }
-}
-
-TEST_P(PurgeableVectorTestWithDiscardableMemory, adoptEmptyVector)
-{
-    Vector<char> testData;
-    PurgeableVector purgeableVector(GetParam());
-    purgeableVector.adopt(testData);
-}
-
-TEST(PurgeableVectorTest, adoptDiscardsPreviousData)
-{
-    Vector<char> testData;
-    std::generate(testData.begin(), testData.end(), &std::rand);
-
-    PurgeableVector purgeableVector(PurgeableVector::NotPurgeable);
-    static const char smallString[] = "hello";
-    purgeableVector.append(smallString, sizeof(smallString));
-    ASSERT_EQ(0, memcmp(purgeableVector.data(), smallString, sizeof(smallString)));
-
-    purgeableVector.adopt(testData);
-    EXPECT_EQ(testData.size(), purgeableVector.size());
-    ASSERT_EQ(0, memcmp(purgeableVector.data(), testData.data(), testData.size()));
-}
-
-// Instantiates all the unit tests using the PurgeableVectorTestWithDiscardableMemory
-// fixture both with and without using discardable memory support.
-INSTANTIATE_TEST_CASE_P(, PurgeableVectorTestWithDiscardableMemory,
-    ::testing::Values(PurgeableVector::NotPurgeable, PurgeableVector::Purgeable));
-
-} // namespace blink