1 /*
2  * Copyright (C) 2013 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 <memory>
18 
19 #include "allocator.h"
20 #include "bit_vector-inl.h"
21 #include "gtest/gtest.h"
22 
23 namespace art {
24 
TEST(BitVector,Test)25 TEST(BitVector, Test) {
26   const size_t kBits = 32;
27 
28   BitVector bv(kBits, false, Allocator::GetMallocAllocator());
29   EXPECT_EQ(1U, bv.GetStorageSize());
30   EXPECT_EQ(sizeof(uint32_t), bv.GetSizeOf());
31   EXPECT_FALSE(bv.IsExpandable());
32 
33   EXPECT_EQ(0U, bv.NumSetBits());
34   EXPECT_EQ(0U, bv.NumSetBits(1));
35   EXPECT_EQ(0U, bv.NumSetBits(kBits));
36   for (size_t i = 0; i < kBits; i++) {
37     EXPECT_FALSE(bv.IsBitSet(i));
38   }
39   EXPECT_EQ(0U, bv.GetRawStorageWord(0));
40   EXPECT_EQ(0U, *bv.GetRawStorage());
41 
42   EXPECT_TRUE(bv.Indexes().begin().Done());
43   EXPECT_TRUE(bv.Indexes().begin() == bv.Indexes().end());
44 
45   bv.SetBit(0);
46   bv.SetBit(kBits - 1);
47   EXPECT_EQ(2U, bv.NumSetBits());
48   EXPECT_EQ(1U, bv.NumSetBits(1));
49   EXPECT_EQ(2U, bv.NumSetBits(kBits));
50   EXPECT_TRUE(bv.IsBitSet(0));
51   for (size_t i = 1; i < kBits - 1; i++) {
52     EXPECT_FALSE(bv.IsBitSet(i));
53   }
54   EXPECT_TRUE(bv.IsBitSet(kBits - 1));
55   EXPECT_EQ(0x80000001U, bv.GetRawStorageWord(0));
56   EXPECT_EQ(0x80000001U, *bv.GetRawStorage());
57 
58   BitVector::IndexIterator iterator = bv.Indexes().begin();
59   EXPECT_TRUE(iterator != bv.Indexes().end());
60   EXPECT_EQ(0u, *iterator);
61   ++iterator;
62   EXPECT_TRUE(iterator != bv.Indexes().end());
63   EXPECT_EQ(kBits - 1u, *iterator);
64   ++iterator;
65   EXPECT_TRUE(iterator == bv.Indexes().end());
66 }
67 
TEST(BitVector,NoopAllocator)68 TEST(BitVector, NoopAllocator) {
69   const uint32_t kWords = 2;
70 
71   uint32_t bits[kWords];
72   memset(bits, 0, sizeof(bits));
73 
74   BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
75   EXPECT_EQ(kWords, bv.GetStorageSize());
76   EXPECT_EQ(kWords * sizeof(uint32_t), bv.GetSizeOf());
77   EXPECT_EQ(bits, bv.GetRawStorage());
78   EXPECT_EQ(0U, bv.NumSetBits());
79 
80   bv.SetBit(8);
81   EXPECT_EQ(1U, bv.NumSetBits());
82   EXPECT_EQ(0x00000100U, bv.GetRawStorageWord(0));
83   EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
84   EXPECT_EQ(1U, bv.NumSetBits());
85 
86   bv.SetBit(16);
87   EXPECT_EQ(2U, bv.NumSetBits());
88   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
89   EXPECT_EQ(0x00000000U, bv.GetRawStorageWord(1));
90   EXPECT_EQ(2U, bv.NumSetBits());
91 
92   bv.SetBit(32);
93   EXPECT_EQ(3U, bv.NumSetBits());
94   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
95   EXPECT_EQ(0x00000001U, bv.GetRawStorageWord(1));
96   EXPECT_EQ(3U, bv.NumSetBits());
97 
98   bv.SetBit(48);
99   EXPECT_EQ(4U, bv.NumSetBits());
100   EXPECT_EQ(0x00010100U, bv.GetRawStorageWord(0));
101   EXPECT_EQ(0x00010001U, bv.GetRawStorageWord(1));
102   EXPECT_EQ(4U, bv.NumSetBits());
103 
104   EXPECT_EQ(0U, bv.NumSetBits(1));
105 
106   EXPECT_EQ(0U, bv.NumSetBits(8));
107   EXPECT_EQ(1U, bv.NumSetBits(9));
108   EXPECT_EQ(1U, bv.NumSetBits(10));
109 
110   EXPECT_EQ(1U, bv.NumSetBits(16));
111   EXPECT_EQ(2U, bv.NumSetBits(17));
112   EXPECT_EQ(2U, bv.NumSetBits(18));
113 
114   EXPECT_EQ(2U, bv.NumSetBits(32));
115   EXPECT_EQ(3U, bv.NumSetBits(33));
116   EXPECT_EQ(3U, bv.NumSetBits(34));
117 
118   EXPECT_EQ(3U, bv.NumSetBits(48));
119   EXPECT_EQ(4U, bv.NumSetBits(49));
120   EXPECT_EQ(4U, bv.NumSetBits(50));
121 
122   EXPECT_EQ(4U, bv.NumSetBits(64));
123 }
124 
TEST(BitVector,SetInitialBits)125 TEST(BitVector, SetInitialBits) {
126   const uint32_t kWords = 2;
127 
128   uint32_t bits[kWords];
129   memset(bits, 0, sizeof(bits));
130 
131   BitVector bv(false, Allocator::GetNoopAllocator(), kWords, bits);
132   bv.SetInitialBits(0u);
133   EXPECT_EQ(0u, bv.NumSetBits());
134   bv.SetInitialBits(1u);
135   EXPECT_EQ(1u, bv.NumSetBits());
136   bv.SetInitialBits(32u);
137   EXPECT_EQ(32u, bv.NumSetBits());
138   bv.SetInitialBits(63u);
139   EXPECT_EQ(63u, bv.NumSetBits());
140   bv.SetInitialBits(64u);
141   EXPECT_EQ(64u, bv.NumSetBits());
142 }
143 
TEST(BitVector,UnionIfNotIn)144 TEST(BitVector, UnionIfNotIn) {
145   {
146     BitVector first(2, true, Allocator::GetMallocAllocator());
147     BitVector second(5, true, Allocator::GetMallocAllocator());
148     BitVector third(5, true, Allocator::GetMallocAllocator());
149 
150     second.SetBit(64);
151     third.SetBit(64);
152     bool changed = first.UnionIfNotIn(&second, &third);
153     EXPECT_EQ(0u, first.NumSetBits());
154     EXPECT_FALSE(changed);
155   }
156 
157   {
158     BitVector first(2, true, Allocator::GetMallocAllocator());
159     BitVector second(5, true, Allocator::GetMallocAllocator());
160     BitVector third(5, true, Allocator::GetMallocAllocator());
161 
162     second.SetBit(64);
163     bool changed = first.UnionIfNotIn(&second, &third);
164     EXPECT_EQ(1u, first.NumSetBits());
165     EXPECT_TRUE(changed);
166     EXPECT_TRUE(first.IsBitSet(64));
167   }
168 }
169 
TEST(BitVector,Subset)170 TEST(BitVector, Subset) {
171   {
172     BitVector first(2, true, Allocator::GetMallocAllocator());
173     BitVector second(5, true, Allocator::GetMallocAllocator());
174 
175     EXPECT_TRUE(first.IsSubsetOf(&second));
176     second.SetBit(4);
177     EXPECT_TRUE(first.IsSubsetOf(&second));
178   }
179 
180   {
181     BitVector first(5, true, Allocator::GetMallocAllocator());
182     BitVector second(5, true, Allocator::GetMallocAllocator());
183 
184     first.SetBit(5);
185     EXPECT_FALSE(first.IsSubsetOf(&second));
186     second.SetBit(4);
187     EXPECT_FALSE(first.IsSubsetOf(&second));
188   }
189 
190   {
191     BitVector first(5, true, Allocator::GetMallocAllocator());
192     BitVector second(5, true, Allocator::GetMallocAllocator());
193 
194     first.SetBit(16);
195     first.SetBit(32);
196     first.SetBit(48);
197     second.SetBit(16);
198     second.SetBit(32);
199     second.SetBit(48);
200 
201     EXPECT_TRUE(first.IsSubsetOf(&second));
202     second.SetBit(8);
203     EXPECT_TRUE(first.IsSubsetOf(&second));
204     second.SetBit(40);
205     EXPECT_TRUE(first.IsSubsetOf(&second));
206     second.SetBit(52);
207     EXPECT_TRUE(first.IsSubsetOf(&second));
208 
209     first.SetBit(9);
210     EXPECT_FALSE(first.IsSubsetOf(&second));
211   }
212 }
213 
TEST(BitVector,CopyTo)214 TEST(BitVector, CopyTo) {
215   {
216     // Test copying an empty BitVector. Padding should fill `buf` with zeroes.
217     BitVector bv(0, true, Allocator::GetMallocAllocator());
218     uint32_t buf;
219 
220     bv.CopyTo(&buf, sizeof(buf));
221     EXPECT_EQ(0u, bv.GetSizeOf());
222     EXPECT_EQ(0u, buf);
223   }
224 
225   {
226     // Test copying when `bv.storage_` and `buf` are of equal lengths.
227     BitVector bv(0, true, Allocator::GetMallocAllocator());
228     uint32_t buf;
229 
230     bv.SetBit(0);
231     bv.SetBit(17);
232     bv.SetBit(26);
233     EXPECT_EQ(sizeof(buf), bv.GetSizeOf());
234 
235     bv.CopyTo(&buf, sizeof(buf));
236     EXPECT_EQ(0x04020001u, buf);
237   }
238 
239   {
240     // Test copying when the `bv.storage_` is longer than `buf`. As long as
241     // `buf` is long enough to hold all set bits, copying should succeed.
242     BitVector bv(0, true, Allocator::GetMallocAllocator());
243     uint8_t buf[5];
244 
245     bv.SetBit(18);
246     bv.SetBit(39);
247     EXPECT_LT(sizeof(buf), bv.GetSizeOf());
248 
249     bv.CopyTo(buf, sizeof(buf));
250     EXPECT_EQ(0x00u, buf[0]);
251     EXPECT_EQ(0x00u, buf[1]);
252     EXPECT_EQ(0x04u, buf[2]);
253     EXPECT_EQ(0x00u, buf[3]);
254     EXPECT_EQ(0x80u, buf[4]);
255   }
256 
257   {
258     // Test zero padding when `bv.storage_` is shorter than `buf`.
259     BitVector bv(0, true, Allocator::GetMallocAllocator());
260     uint32_t buf[2];
261 
262     bv.SetBit(18);
263     bv.SetBit(31);
264     EXPECT_GT(sizeof(buf), bv.GetSizeOf());
265 
266     bv.CopyTo(buf, sizeof(buf));
267     EXPECT_EQ(0x80040000U, buf[0]);
268     EXPECT_EQ(0x00000000U, buf[1]);
269   }
270 }
271 
272 }  // namespace art
273