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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/heap/heap_page.h"
#include "third_party/blink/renderer/platform/heap/heap_test_utilities.h"
namespace blink {
namespace {
class BaseObject : public GarbageCollected<BaseObject> {
public:
size_t CardNumber() const;
void Trace(Visitor*) {}
};
} // namespace
class CardTableTest : public TestSupportingGC {
public:
static constexpr size_t kCardSize = NormalPage::CardTable::kCardSize;
CardTableTest() { ClearOutOldGarbage(); }
static void CheckObjects(const std::vector<BaseObject*>& objects,
const NormalPage& page) {
page.IterateCardTable([&objects](HeapObjectHeader* header) {
const BaseObject* object =
reinterpret_cast<BaseObject*>(header->Payload());
auto it = std::find(objects.begin(), objects.end(), object);
EXPECT_NE(it, objects.end());
});
}
static void MarkCardForObject(BaseObject* object) {
NormalPage* page = static_cast<NormalPage*>(PageFromObject(object));
page->MarkCard(reinterpret_cast<Address>(object));
}
static bool IsCardMarked(const NormalPage& page, size_t card_number) {
return page.card_table_.IsMarked(card_number);
}
static size_t ObjectsInCard(const NormalPage& page, size_t card_number) {
const NormalPage::CardTable& cards = page.card_table_;
size_t objects = 0;
Address card_begin =
RoundToBlinkPageStart(page.GetAddress()) + (card_number * kCardSize);
const Address card_end = card_begin + kCardSize;
if (card_number == cards.begin().index) {
// First card is misaligned due to padding.
card_begin = page.Payload();
}
page.ArenaForNormalPage()->MakeConsistentForGC();
page.IterateOnCard(
[card_begin, card_end, &objects](HeapObjectHeader* header) {
const Address header_address = reinterpret_cast<Address>(header);
if (header_address < card_begin) {
const Address next_header_address = header_address + header->size();
EXPECT_GT(next_header_address, card_begin);
} else {
objects++;
EXPECT_LT(header_address, card_end);
}
},
card_number);
return objects;
}
static size_t MarkedObjects(const NormalPage& page) {
size_t objects = 0;
page.ArenaForNormalPage()->MakeConsistentForGC();
page.IterateCardTable([&objects](HeapObjectHeader*) { ++objects; });
return objects;
}
static void ClearCardTable(NormalPage& page) { page.card_table_.Clear(); }
};
namespace {
size_t BaseObject::CardNumber() const {
return (reinterpret_cast<uintptr_t>(this) & kBlinkPageOffsetMask) /
CardTableTest::kCardSize;
}
template <size_t Size>
class Object : public BaseObject {
private:
uint8_t array[Size];
};
} // namespace
TEST_F(CardTableTest, Empty) {
BaseObject* obj = MakeGarbageCollected<BaseObject>();
EXPECT_EQ(0u, MarkedObjects(*static_cast<NormalPage*>(PageFromObject(obj))));
}
TEST_F(CardTableTest, SingleObjectOnFirstCard) {
BaseObject* obj = MakeGarbageCollected<BaseObject>();
MarkCardForObject(obj);
const NormalPage& page = *static_cast<NormalPage*>(PageFromObject(obj));
const size_t card_number = obj->CardNumber();
EXPECT_TRUE(IsCardMarked(page, card_number));
const size_t objects = ObjectsInCard(page, card_number);
EXPECT_EQ(1u, objects);
}
TEST_F(CardTableTest, SingleObjectOnSecondCard) {
MakeGarbageCollected<Object<kCardSize>>();
BaseObject* obj = MakeGarbageCollected<Object<kCardSize>>();
MarkCardForObject(obj);
const NormalPage& page = *static_cast<NormalPage*>(PageFromObject(obj));
const size_t card_number = obj->CardNumber();
EXPECT_TRUE(IsCardMarked(page, card_number));
const size_t objects = ObjectsInCard(page, card_number);
EXPECT_EQ(1u, objects);
}
TEST_F(CardTableTest, TwoObjectsOnSecondCard) {
static constexpr size_t kHalfCardSize = kCardSize / 2;
MakeGarbageCollected<Object<kHalfCardSize>>();
MakeGarbageCollected<Object<kHalfCardSize>>();
// The card on which 'obj' resides is guaranteed to have two objects, either
// the previously allocated one or the following one.
BaseObject* obj = MakeGarbageCollected<Object<kHalfCardSize>>();
MakeGarbageCollected<Object<kHalfCardSize>>();
MarkCardForObject(obj);
const NormalPage& page = *static_cast<NormalPage*>(PageFromObject(obj));
const size_t card_number = obj->CardNumber();
EXPECT_TRUE(IsCardMarked(page, card_number));
const size_t objects = ObjectsInCard(page, card_number);
EXPECT_EQ(2u, objects);
}
TEST_F(CardTableTest, Clear) {
MakeGarbageCollected<Object<kCardSize>>();
MakeGarbageCollected<Object<kCardSize / 2>>();
BaseObject* obj = MakeGarbageCollected<Object<kCardSize / 2>>();
MarkCardForObject(obj);
NormalPage& page = *static_cast<NormalPage*>(PageFromObject(obj));
ClearCardTable(page);
const size_t card_number = obj->CardNumber();
EXPECT_FALSE(IsCardMarked(page, card_number));
}
TEST_F(CardTableTest, MultipleObjects) {
std::vector<BaseObject*> objects;
BaseObject* obj = MakeGarbageCollected<Object<kCardSize>>();
BasePage* const first_page = PageFromObject(obj);
BasePage* new_page = first_page;
while (first_page == new_page) {
objects.push_back(obj);
MarkCardForObject(obj);
obj = MakeGarbageCollected<Object<kCardSize>>();
new_page = PageFromObject(obj);
}
CheckObjects(objects, *static_cast<NormalPage*>(first_page));
}
} // namespace blink
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