1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "card_table-inl.h"
18
19 #include <string>
20
21 #include "base/atomic.h"
22 #include "base/utils.h"
23 #include "common_runtime_test.h"
24 #include "handle_scope-inl.h"
25 #include "mirror/class-inl.h"
26 #include "mirror/string-inl.h" // Strings are easiest to allocate
27 #include "scoped_thread_state_change-inl.h"
28 #include "thread_pool.h"
29
30 namespace art {
31
32 namespace mirror {
33 class Object;
34 } // namespace mirror
35
36 namespace gc {
37 namespace accounting {
38
39 class CardTableTest : public CommonRuntimeTest {
40 public:
41 std::unique_ptr<CardTable> card_table_;
42
CommonSetup()43 void CommonSetup() {
44 if (card_table_.get() == nullptr) {
45 card_table_.reset(CardTable::Create(heap_begin_, heap_size_));
46 EXPECT_TRUE(card_table_.get() != nullptr);
47 } else {
48 ClearCardTable();
49 }
50 }
51 // Default values for the test, not random to avoid undeterministic behaviour.
CardTableTest()52 CardTableTest() : heap_begin_(reinterpret_cast<uint8_t*>(0x2000000)), heap_size_(2 * MB) {
53 }
ClearCardTable()54 void ClearCardTable() {
55 card_table_->ClearCardTable();
56 }
HeapBegin() const57 uint8_t* HeapBegin() const {
58 return heap_begin_;
59 }
HeapLimit() const60 uint8_t* HeapLimit() const {
61 return HeapBegin() + heap_size_;
62 }
63 // Return a non-zero pseudo random card for an address.
PseudoRandomCard(const uint8_t * addr) const64 uint8_t PseudoRandomCard(const uint8_t* addr) const {
65 size_t offset = RoundDown(addr - heap_begin_, CardTable::kCardSize);
66 return 1 + offset % 254;
67 }
FillRandom()68 void FillRandom() {
69 for (const uint8_t* addr = HeapBegin(); addr != HeapLimit(); addr += CardTable::kCardSize) {
70 EXPECT_TRUE(card_table_->AddrIsInCardTable(addr));
71 uint8_t* card = card_table_->CardFromAddr(addr);
72 *card = PseudoRandomCard(addr);
73 }
74 }
75
76 private:
77 uint8_t* const heap_begin_;
78 const size_t heap_size_;
79 };
80
TEST_F(CardTableTest,TestMarkCard)81 TEST_F(CardTableTest, TestMarkCard) {
82 CommonSetup();
83 for (const uint8_t* addr = HeapBegin(); addr < HeapLimit(); addr += kObjectAlignment) {
84 auto obj = reinterpret_cast<const mirror::Object*>(addr);
85 EXPECT_EQ(card_table_->GetCard(obj), CardTable::kCardClean);
86 EXPECT_TRUE(!card_table_->IsDirty(obj));
87 card_table_->MarkCard(addr);
88 EXPECT_TRUE(card_table_->IsDirty(obj));
89 EXPECT_EQ(card_table_->GetCard(obj), CardTable::kCardDirty);
90 uint8_t* card_addr = card_table_->CardFromAddr(addr);
91 EXPECT_EQ(*card_addr, CardTable::kCardDirty);
92 *card_addr = CardTable::kCardClean;
93 EXPECT_EQ(*card_addr, CardTable::kCardClean);
94 }
95 }
96
97 class UpdateVisitor {
98 public:
operator ()(uint8_t c) const99 uint8_t operator()(uint8_t c) const {
100 // Must map zero to zero. Never applied to zero.
101 return c == 0 ? 0 : c * 93 + 123;
102 }
operator ()(uint8_t *,uint8_t,uint8_t) const103 void operator()(uint8_t* /*card*/, uint8_t /*expected_value*/, uint8_t /*new_value*/) const {
104 }
105 };
106
TEST_F(CardTableTest,TestModifyCardsAtomic)107 TEST_F(CardTableTest, TestModifyCardsAtomic) {
108 CommonSetup();
109 FillRandom();
110 const size_t delta = std::min(static_cast<size_t>(HeapLimit() - HeapBegin()),
111 8U * CardTable::kCardSize);
112 UpdateVisitor visitor;
113 size_t start_offset = 0;
114 for (uint8_t* cstart = HeapBegin(); cstart < HeapBegin() + delta; cstart += CardTable::kCardSize) {
115 start_offset = (start_offset + kObjectAlignment) % CardTable::kCardSize;
116 size_t end_offset = 0;
117 for (uint8_t* cend = HeapLimit() - delta; cend < HeapLimit(); cend += CardTable::kCardSize) {
118 // Don't always start at a card boundary.
119 uint8_t* start = cstart + start_offset;
120 uint8_t* end = cend - end_offset;
121 end_offset = (end_offset + kObjectAlignment) % CardTable::kCardSize;
122 // Modify cards.
123 card_table_->ModifyCardsAtomic(start, end, visitor, visitor);
124 // Check adjacent cards not modified.
125 for (uint8_t* cur = start - CardTable::kCardSize; cur >= HeapBegin();
126 cur -= CardTable::kCardSize) {
127 EXPECT_EQ(card_table_->GetCard(reinterpret_cast<mirror::Object*>(cur)),
128 PseudoRandomCard(cur));
129 }
130 for (uint8_t* cur = end + CardTable::kCardSize; cur < HeapLimit();
131 cur += CardTable::kCardSize) {
132 EXPECT_EQ(card_table_->GetCard(reinterpret_cast<mirror::Object*>(cur)),
133 PseudoRandomCard(cur));
134 }
135 // Verify Range.
136 for (uint8_t* cur = start; cur < AlignUp(end, CardTable::kCardSize);
137 cur += CardTable::kCardSize) {
138 uint8_t* card = card_table_->CardFromAddr(cur);
139 uint8_t value = PseudoRandomCard(cur);
140 EXPECT_EQ(visitor(value), *card);
141 // Restore for next iteration.
142 *card = value;
143 }
144 }
145 }
146 }
147
148 // TODO: Add test for CardTable::Scan.
149 } // namespace accounting
150 } // namespace gc
151 } // namespace art
152