1 /*
2  * Copyright (C) 2016 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 #define LOG_TAG "LibHidlTest"
18 
19 #pragma clang diagnostic push
20 #pragma clang diagnostic error "-Wpadded"
21 #include <hidl/HidlInternal.h>
22 #include <hidl/HidlSupport.h>
23 #pragma clang diagnostic pop
24 
25 #include <android-base/logging.h>
26 #include <android/hidl/memory/1.0/IMemory.h>
27 #include <gmock/gmock.h>
28 #include <gtest/gtest.h>
29 #include <hidl/ServiceManagement.h>
30 #include <hidl/Status.h>
31 #include <hidl/TaskRunner.h>
32 #include <condition_variable>
33 #include <fstream>
34 #include <vector>
35 
36 #ifdef __ANDROID__
37 static bool kAndroid = true;
38 #else
39 static bool kAndroid = false;
40 #endif
41 
42 #define EXPECT_ARRAYEQ(__a1__, __a2__, __size__) EXPECT_TRUE(isArrayEqual(__a1__, __a2__, __size__))
43 #define EXPECT_2DARRAYEQ(__a1__, __a2__, __size1__, __size2__) \
44         EXPECT_TRUE(is2dArrayEqual(__a1__, __a2__, __size1__, __size2__))
45 
46 template<typename T, typename S>
isArrayEqual(const T arr1,const S arr2,size_t size)47 static inline bool isArrayEqual(const T arr1, const S arr2, size_t size) {
48     for(size_t i = 0; i < size; i++)
49         if(arr1[i] != arr2[i])
50             return false;
51     return true;
52 }
53 
54 template<typename T, typename S>
is2dArrayEqual(const T arr1,const S arr2,size_t size1,size_t size2)55 static inline bool is2dArrayEqual(const T arr1, const S arr2, size_t size1, size_t size2) {
56     for(size_t i = 0; i < size1; i++)
57         for (size_t j = 0; j < size2; j++)
58             if(arr1[i][j] != arr2[i][j])
59                 return false;
60     return true;
61 }
62 
isLibraryOpen(const std::string & lib)63 bool isLibraryOpen(const std::string& lib) {
64     std::ifstream ifs("/proc/self/maps");
65     for (std::string line; std::getline(ifs, line);) {
66         if (line.size() >= lib.size() && line.substr(line.size() - lib.size()) == lib) {
67             return true;
68         }
69     }
70 
71     return false;
72 }
73 
74 class LibHidlTest : public ::testing::Test {
75 public:
SetUp()76     virtual void SetUp() override {
77     }
TearDown()78     virtual void TearDown() override {
79     }
80 };
81 
TEST_F(LibHidlTest,StringTest)82 TEST_F(LibHidlTest, StringTest) {
83     using android::hardware::hidl_string;
84     hidl_string s; // empty constructor
85     EXPECT_STREQ(s.c_str(), "");
86     hidl_string s1 = "s1"; // copy = from cstr
87     EXPECT_STREQ(s1.c_str(), "s1");
88     hidl_string s2("s2"); // copy constructor from cstr
89     EXPECT_STREQ(s2.c_str(), "s2");
90     hidl_string s2a(nullptr); // copy constructor from null cstr
91     EXPECT_STREQ("", s2a.c_str());
92     s2a = nullptr; // = from nullptr cstr
93     EXPECT_STREQ(s2a.c_str(), "");
94     hidl_string s3 = hidl_string("s3"); // move =
95     EXPECT_STREQ(s3.c_str(), "s3");
96     hidl_string s4 = hidl_string("12345", 3); // copy constructor from cstr w/ length
97     EXPECT_STREQ(s4.c_str(), "123");
98     hidl_string s5(hidl_string(hidl_string("s5"))); // move constructor
99     EXPECT_STREQ(s5.c_str(), "s5");
100     hidl_string s6(std::string("s6")); // copy constructor from std::string
101     EXPECT_STREQ(s6.c_str(), "s6");
102     hidl_string s7 = std::string("s7"); // copy = from std::string
103     EXPECT_STREQ(s7.c_str(), "s7");
104     hidl_string s8(s7); // copy constructor // NOLINT, test the copy constructor
105     EXPECT_STREQ(s8.c_str(), "s7");
106     hidl_string s9 = s8; // copy =  // NOLINT, test the copy operator
107     EXPECT_STREQ(s9.c_str(), "s7");
108     char myCString[20] = "myCString";
109     s.setToExternal(&myCString[0], strlen(myCString));
110     EXPECT_STREQ(s.c_str(), "myCString");
111     myCString[2] = 'D';
112     EXPECT_STREQ(s.c_str(), "myDString");
113     s.clear(); // should not affect myCString
114     EXPECT_STREQ(myCString, "myDString");
115 
116     // casts
117     s = "great";
118     std::string myString = s;
119     const char *anotherCString = s.c_str();
120     EXPECT_EQ(myString, "great");
121     EXPECT_STREQ(anotherCString, "great");
122 
123     const hidl_string t = "not so great";
124     std::string myTString = t;
125     const char * anotherTCString = t.c_str();
126     EXPECT_EQ(myTString, "not so great");
127     EXPECT_STREQ(anotherTCString, "not so great");
128 
129     // Assignment from hidl_string to std::string
130     std::string tgt;
131     hidl_string src("some stuff");
132     tgt = src;
133     EXPECT_STREQ(tgt.c_str(), "some stuff");
134 
135     // Stream output operator
136     hidl_string msg("hidl_string works with operator<<");
137     std::cout << msg;
138 
139     // Comparisons
140     const char * cstr1 = "abc";
141     std::string string1(cstr1);
142     hidl_string hs1(cstr1);
143     const char * cstrE = "abc";
144     std::string stringE(cstrE);
145     hidl_string hsE(cstrE);
146     const char * cstrNE = "ABC";
147     std::string stringNE(cstrNE);
148     hidl_string hsNE(cstrNE);
149     const char * cstr2 = "def";
150     std::string string2(cstr2);
151     hidl_string hs2(cstr2);
152 
153     EXPECT_TRUE(hs1  == hsE);
154     EXPECT_FALSE(hs1 == hsNE);
155     EXPECT_TRUE(hs1  == cstrE);
156     EXPECT_FALSE(hs1 == cstrNE);
157     EXPECT_TRUE(hs1  == stringE);
158     EXPECT_FALSE(hs1 == stringNE);
159     EXPECT_FALSE(hs1 != hsE);
160     EXPECT_TRUE(hs1  != hsNE);
161     EXPECT_FALSE(hs1 != cstrE);
162     EXPECT_TRUE(hs1  != cstrNE);
163     EXPECT_FALSE(hs1 != stringE);
164     EXPECT_TRUE(hs1  != stringNE);
165 
166     EXPECT_TRUE(hs1 < hs2);
167     EXPECT_FALSE(hs2 < hs1);
168     EXPECT_TRUE(hs2 > hs1);
169     EXPECT_FALSE(hs1 > hs2);
170     EXPECT_TRUE(hs1 <= hs1);
171     EXPECT_TRUE(hs1 <= hs2);
172     EXPECT_FALSE(hs2 <= hs1);
173     EXPECT_TRUE(hs1 >= hs1);
174     EXPECT_TRUE(hs2 >= hs1);
175     EXPECT_FALSE(hs2 <= hs1);
176 }
177 
178 // empty string optimization should apply for any constructor
TEST_F(LibHidlTest,HidlStringEmptyLiteralAllocation)179 TEST_F(LibHidlTest, HidlStringEmptyLiteralAllocation) {
180     using android::hardware::hidl_string;
181 
182     hidl_string empty1;
183     hidl_string empty2("");
184     hidl_string empty3("foo", 0);
185     hidl_string empty4((std::string()));
186 
187     EXPECT_EQ(empty1.c_str(), empty2.c_str());
188     EXPECT_EQ(empty1.c_str(), empty3.c_str());
189     EXPECT_EQ(empty1.c_str(), empty4.c_str());
190 }
191 
TEST_F(LibHidlTest,MemoryTest)192 TEST_F(LibHidlTest, MemoryTest) {
193     using android::hardware::hidl_memory;
194 
195     hidl_memory mem1 = hidl_memory(); // default constructor
196     hidl_memory mem2 = mem1; // copy constructor (nullptr), NOLINT
197 
198     EXPECT_EQ(nullptr, mem2.handle());
199 
200     native_handle_t* testHandle = native_handle_create(0 /* numInts */, 0 /* numFds */);
201 
202     hidl_memory mem3 = hidl_memory("foo", testHandle, 42 /* size */); // owns testHandle
203     hidl_memory mem4 = mem3; // copy constructor (regular handle), NOLINT
204 
205     EXPECT_EQ(mem3.name(), mem4.name());
206     EXPECT_EQ(mem3.size(), mem4.size());
207     EXPECT_NE(nullptr, mem4.handle());
208     EXPECT_NE(mem3.handle(), mem4.handle()); // check handle cloned
209 
210     hidl_memory mem5 = hidl_memory("foo", nullptr, 0); // hidl memory works with nullptr handle
211     hidl_memory mem6 = mem5; // NOLINT, test copying
212     EXPECT_EQ(nullptr, mem5.handle());
213     EXPECT_EQ(nullptr, mem6.handle());
214 }
215 
TEST_F(LibHidlTest,VecInitTest)216 TEST_F(LibHidlTest, VecInitTest) {
217     using android::hardware::hidl_vec;
218     using std::vector;
219     int32_t array[] = {5, 6, 7};
220     vector<int32_t> v(array, array + 3);
221 
222     hidl_vec<int32_t> hv0(3);  // size
223     EXPECT_EQ(hv0.size(), 3ul);  // cannot say anything about its contents
224 
225     hidl_vec<int32_t> hv1 = v; // copy =
226     EXPECT_ARRAYEQ(hv1, array, 3);
227     EXPECT_ARRAYEQ(hv1, v, 3);
228     hidl_vec<int32_t> hv2(v); // copy constructor
229     EXPECT_ARRAYEQ(hv2, v, 3);
230 
231     vector<int32_t> v2 = hv1; // cast
232     EXPECT_ARRAYEQ(v2, v, 3);
233 
234     hidl_vec<int32_t> v3 = {5, 6, 7}; // initializer_list
235     EXPECT_EQ(v3.size(), 3ul);
236     EXPECT_ARRAYEQ(v3, array, v3.size());
237 }
238 
TEST_F(LibHidlTest,VecReleaseTest)239 TEST_F(LibHidlTest, VecReleaseTest) {
240     // this test indicates an inconsistency of behaviors which is undesirable.
241     // Perhaps hidl-vec should always allocate an empty vector whenever it
242     // exposes its data. Alternatively, perhaps it should always free/reject
243     // empty vectors and always return nullptr for this state. While this second
244     // alternative is faster, it makes client code harder to write, and it would
245     // break existing client code.
246     using android::hardware::hidl_vec;
247 
248     hidl_vec<int32_t> empty;
249     EXPECT_EQ(nullptr, empty.releaseData());
250 
251     empty.resize(0);
252     int32_t* data = empty.releaseData();
253     EXPECT_NE(nullptr, data);
254     delete data;
255 }
256 
TEST_F(LibHidlTest,VecIterTest)257 TEST_F(LibHidlTest, VecIterTest) {
258     int32_t array[] = {5, 6, 7};
259     android::hardware::hidl_vec<int32_t> hv1 = std::vector<int32_t>(array, array + 3);
260 
261     auto iter = hv1.begin();    // iterator begin()
262     EXPECT_EQ(*iter++, 5);
263     EXPECT_EQ(*iter, 6);
264     EXPECT_EQ(*++iter, 7);
265     EXPECT_EQ(*iter--, 7);
266     EXPECT_EQ(*iter, 6);
267     EXPECT_EQ(*--iter, 5);
268 
269     iter += 2;
270     EXPECT_EQ(*iter, 7);
271     iter -= 2;
272     EXPECT_EQ(*iter, 5);
273 
274     iter++;
275     EXPECT_EQ(*(iter + 1), 7);
276     EXPECT_EQ(*(1 + iter), 7);
277     EXPECT_EQ(*(iter - 1), 5);
278     EXPECT_EQ(*iter, 6);
279 
280     auto five = iter - 1;
281     auto seven = iter + 1;
282     EXPECT_EQ(seven - five, 2);
283     EXPECT_EQ(five - seven, -2);
284 
285     EXPECT_LT(five, seven);
286     EXPECT_LE(five, seven);
287     EXPECT_GT(seven, five);
288     EXPECT_GE(seven, five);
289 
290     EXPECT_EQ(seven[0], 7);
291     EXPECT_EQ(five[1], 6);
292 }
293 
TEST_F(LibHidlTest,VecIterForTest)294 TEST_F(LibHidlTest, VecIterForTest) {
295     using android::hardware::hidl_vec;
296     int32_t array[] = {5, 6, 7};
297     hidl_vec<int32_t> hv1 = std::vector<int32_t>(array, array + 3);
298 
299     int32_t sum = 0;            // range based for loop interoperability
300     for (auto &&i: hv1) {
301         sum += i;
302     }
303     EXPECT_EQ(sum, 5+6+7);
304 
305     for (auto iter = hv1.begin(); iter < hv1.end(); ++iter) {
306         *iter += 10;
307     }
308     const hidl_vec<int32_t> &v4 = hv1;
309     sum = 0;
310     for (const auto &i : v4) {
311         sum += i;
312     }
313     EXPECT_EQ(sum, 15+16+17);
314 }
315 
TEST_F(LibHidlTest,VecEqTest)316 TEST_F(LibHidlTest, VecEqTest) {
317     android::hardware::hidl_vec<int32_t> hv1{5, 6, 7};
318     android::hardware::hidl_vec<int32_t> hv2{5, 6, 7};
319     android::hardware::hidl_vec<int32_t> hv3{5, 6, 8};
320 
321     // use the == and != operator intentionally here
322     EXPECT_TRUE(hv1 == hv2);
323     EXPECT_TRUE(hv1 != hv3);
324 }
325 
TEST_F(LibHidlTest,VecEqInitializerTest)326 TEST_F(LibHidlTest, VecEqInitializerTest) {
327     std::vector<int32_t> reference{5, 6, 7};
328     android::hardware::hidl_vec<int32_t> hv1{1, 2, 3};
329     hv1 = {5, 6, 7};
330     android::hardware::hidl_vec<int32_t> hv2;
331     hv2 = {5, 6, 7};
332     android::hardware::hidl_vec<int32_t> hv3;
333     hv3 = {5, 6, 8};
334 
335     // use the == and != operator intentionally here
336     EXPECT_TRUE(hv1 == hv2);
337     EXPECT_TRUE(hv1 == reference);
338     EXPECT_TRUE(hv1 != hv3);
339 }
340 
TEST_F(LibHidlTest,VecRangeCtorTest)341 TEST_F(LibHidlTest, VecRangeCtorTest) {
342     struct ConvertibleType {
343         int val;
344 
345         explicit ConvertibleType(int val) : val(val) {}
346         explicit operator int() const { return val; }
347         bool operator==(const int& other) const { return val == other; }
348     };
349 
350     std::vector<ConvertibleType> input{
351         ConvertibleType(1), ConvertibleType(2), ConvertibleType(3),
352     };
353 
354     android::hardware::hidl_vec<int> hv(input.begin(), input.end());
355 
356     EXPECT_EQ(input.size(), hv.size());
357     int sum = 0;
358     for (unsigned i = 0; i < input.size(); i++) {
359         EXPECT_EQ(input[i], hv[i]);
360         sum += hv[i];
361     }
362     EXPECT_EQ(sum, 1 + 2 + 3);
363 }
364 
365 struct FailsIfCopied {
FailsIfCopiedFailsIfCopied366     FailsIfCopied() {}
367 
368     // add failure if copied since in general this can be expensive
FailsIfCopiedFailsIfCopied369     FailsIfCopied(const FailsIfCopied& o) { *this = o; }
operator =FailsIfCopied370     FailsIfCopied& operator=(const FailsIfCopied&) {
371         ADD_FAILURE() << "FailsIfCopied copied";
372         return *this;
373     }
374 
375     // fine to move this type since in general this is cheaper
376     FailsIfCopied(FailsIfCopied&& o) = default;
377     FailsIfCopied& operator=(FailsIfCopied&&) = default;
378 };
379 
TEST_F(LibHidlTest,VecResizeNoCopy)380 TEST_F(LibHidlTest, VecResizeNoCopy) {
381     using android::hardware::hidl_vec;
382 
383     hidl_vec<FailsIfCopied> noCopies;
384     noCopies.resize(3);  // instantiates three elements
385 
386     FailsIfCopied* oldPointer = noCopies.data();
387 
388     noCopies.resize(6);  // should move three elements, not copy
389 
390     // oldPointer should be invalidated at this point.
391     // hidl_vec doesn't currently try to realloc but if it ever switches
392     // to an implementation that does, this test wouldn't do anything.
393     EXPECT_NE(oldPointer, noCopies.data());
394 }
395 
TEST_F(LibHidlTest,VecFindTest)396 TEST_F(LibHidlTest, VecFindTest) {
397     using android::hardware::hidl_vec;
398     hidl_vec<int32_t> hv1 = {10, 20, 30, 40};
399     const hidl_vec<int32_t> hv2 = {1, 2, 3, 4};
400 
401     auto it = hv1.find(20);
402     EXPECT_EQ(20, *it);
403     *it = 21;
404     EXPECT_EQ(21, *it);
405     it = hv1.find(20);
406     EXPECT_EQ(hv1.end(), it);
407     it = hv1.find(21);
408     EXPECT_EQ(21, *it);
409 
410     auto cit = hv2.find(4);
411     EXPECT_EQ(4, *cit);
412 }
413 
TEST_F(LibHidlTest,VecContainsTest)414 TEST_F(LibHidlTest, VecContainsTest) {
415     using android::hardware::hidl_vec;
416     hidl_vec<int32_t> hv1 = {10, 20, 30, 40};
417     const hidl_vec<int32_t> hv2 = {0, 1, 2, 3, 4};
418 
419     EXPECT_TRUE(hv1.contains(10));
420     EXPECT_TRUE(hv1.contains(40));
421     EXPECT_FALSE(hv1.contains(1));
422     EXPECT_FALSE(hv1.contains(0));
423     EXPECT_TRUE(hv2.contains(0));
424     EXPECT_FALSE(hv2.contains(10));
425 
426     hv1[0] = 11;
427     EXPECT_FALSE(hv1.contains(10));
428     EXPECT_TRUE(hv1.contains(11));
429 }
430 
TEST_F(LibHidlTest,ArrayTest)431 TEST_F(LibHidlTest, ArrayTest) {
432     using android::hardware::hidl_array;
433     int32_t array[] = {5, 6, 7};
434 
435     hidl_array<int32_t, 3> ha(array);
436     EXPECT_ARRAYEQ(ha, array, 3);
437 }
438 
TEST_F(LibHidlTest,TaskRunnerTest)439 TEST_F(LibHidlTest, TaskRunnerTest) {
440     using android::hardware::details::TaskRunner;
441     using namespace std::chrono_literals;
442 
443     std::condition_variable cv;
444     std::mutex m;
445 
446     TaskRunner tr;
447     tr.start(1 /* limit */);
448     bool flag = false;
449     tr.push([&] {
450         flag = true;
451         cv.notify_all();
452     });
453 
454     std::unique_lock<std::mutex> lock(m);
455 
456     // 1s so this doesn't deadlock. This isn't a performance test.
457     EXPECT_TRUE(cv.wait_for(lock, 1s, [&]{return flag;}));
458     EXPECT_TRUE(flag);
459 }
460 
TEST_F(LibHidlTest,StringCmpTest)461 TEST_F(LibHidlTest, StringCmpTest) {
462     using android::hardware::hidl_string;
463     const char * s = "good";
464     hidl_string hs(s);
465     EXPECT_NE(hs.c_str(), s);
466 
467     EXPECT_TRUE(hs == s); // operator ==
468     EXPECT_TRUE(s == hs);
469 
470     EXPECT_FALSE(hs != s); // operator ==
471     EXPECT_FALSE(s != hs);
472 }
473 
474 template <typename T>
great(android::hardware::hidl_vec<T>)475 void great(android::hardware::hidl_vec<T>) {}
476 
TEST_F(LibHidlTest,VecCopyTest)477 TEST_F(LibHidlTest, VecCopyTest) {
478     android::hardware::hidl_vec<int32_t> v;
479     great(v);
480 }
481 
TEST_F(LibHidlTest,StdArrayTest)482 TEST_F(LibHidlTest, StdArrayTest) {
483     using android::hardware::hidl_array;
484     hidl_array<int32_t, 5> array{(int32_t[5]){1, 2, 3, 4, 5}};
485     std::array<int32_t, 5> stdArray = array;
486     EXPECT_ARRAYEQ(array.data(), stdArray.data(), 5);
487     hidl_array<int32_t, 5> array2 = stdArray;
488     EXPECT_ARRAYEQ(array.data(), array2.data(), 5);
489 }
490 
TEST_F(LibHidlTest,MultiDimStdArrayTest)491 TEST_F(LibHidlTest, MultiDimStdArrayTest) {
492     using android::hardware::hidl_array;
493     hidl_array<int32_t, 2, 3> array;
494     for (size_t i = 0; i < 2; i++) {
495         for (size_t j = 0; j < 3; j++) {
496             array[i][j] = i + j + i * j;
497         }
498     }
499     std::array<std::array<int32_t, 3>, 2> stdArray = array;
500     EXPECT_2DARRAYEQ(array, stdArray, 2, 3);
501     hidl_array<int32_t, 2, 3> array2 = stdArray;
502     EXPECT_2DARRAYEQ(array, array2, 2, 3);
503 }
504 
TEST_F(LibHidlTest,HidlVersionTest)505 TEST_F(LibHidlTest, HidlVersionTest) {
506     using android::hardware::hidl_version;
507     hidl_version v1_0{1, 0};
508     EXPECT_EQ(1, v1_0.get_major());
509     EXPECT_EQ(0, v1_0.get_minor());
510     hidl_version v2_0{2, 0};
511     hidl_version v2_1{2, 1};
512     hidl_version v2_2{2, 2};
513     hidl_version v3_0{3, 0};
514     hidl_version v3_0b{3,0};
515 
516     EXPECT_TRUE(v1_0 < v2_0);
517     EXPECT_TRUE(v1_0 != v2_0);
518     EXPECT_TRUE(v2_0 < v2_1);
519     EXPECT_TRUE(v2_1 < v3_0);
520     EXPECT_TRUE(v2_0 > v1_0);
521     EXPECT_TRUE(v2_0 != v1_0);
522     EXPECT_TRUE(v2_1 > v2_0);
523     EXPECT_TRUE(v3_0 > v2_1);
524     EXPECT_TRUE(v3_0 == v3_0b);
525     EXPECT_FALSE(v3_0 != v3_0b);
526     EXPECT_TRUE(v3_0 <= v3_0b);
527     EXPECT_TRUE(v2_2 <= v3_0);
528     EXPECT_TRUE(v3_0 >= v3_0b);
529     EXPECT_TRUE(v3_0 >= v2_2);
530 }
531 
TEST_F(LibHidlTest,ReturnMoveTest)532 TEST_F(LibHidlTest, ReturnMoveTest) {
533     using namespace ::android;
534     using ::android::hardware::Return;
535     using ::android::hardware::Status;
536     Return<void> ret{Status::fromStatusT(DEAD_OBJECT)};
537     ret.isOk();
538     ret = {Status::fromStatusT(DEAD_OBJECT)};
539     ret.isOk();
540 }
541 
TEST_F(LibHidlTest,ReturnTest)542 TEST_F(LibHidlTest, ReturnTest) {
543     using ::android::DEAD_OBJECT;
544     using ::android::hardware::Return;
545     using ::android::hardware::Status;
546     using ::android::hardware::hidl_string;
547 
548     EXPECT_FALSE(Return<void>(Status::fromStatusT(DEAD_OBJECT)).isOk());
549     EXPECT_TRUE(Return<void>(Status::ok()).isOk());
550 
551     hidl_string one = "1";
552     hidl_string two = "2";
553     Return<hidl_string> ret = Return<hidl_string>(Status::fromStatusT(DEAD_OBJECT));
554 
555     EXPECT_EQ(one, Return<hidl_string>(one).withDefault(two));
556     EXPECT_EQ(two, ret.withDefault(two));
557 
558     hidl_string&& moved = ret.withDefault(std::move(two));
559     EXPECT_EQ("2", moved);
560 
561     const hidl_string three = "3";
562     EXPECT_EQ(three, ret.withDefault(three));
563 }
564 
TEST_F(LibHidlTest,ReturnDies)565 TEST_F(LibHidlTest, ReturnDies) {
566     using ::android::hardware::Return;
567     using ::android::hardware::Status;
568 
569     EXPECT_DEATH({ Return<void>(Status::fromStatusT(-EBUSY)); }, "");
570     EXPECT_DEATH({ Return<void>(Status::fromStatusT(-EBUSY)).isDeadObject(); }, "");
571     EXPECT_DEATH(
572             {
573                 Return<int> ret = Return<int>(Status::fromStatusT(-EBUSY));
574                 int foo = ret;  // should crash here
575                 (void)foo;
576                 ret.isOk();
577             },
578             "");
579 }
580 
TEST_F(LibHidlTest,DetectUncheckedReturn)581 TEST_F(LibHidlTest, DetectUncheckedReturn) {
582     using ::android::hardware::HidlReturnRestriction;
583     using ::android::hardware::Return;
584     using ::android::hardware::setProcessHidlReturnRestriction;
585     using ::android::hardware::Status;
586 
587     setProcessHidlReturnRestriction(HidlReturnRestriction::FATAL_IF_UNCHECKED);
588 
589     EXPECT_DEATH(
590             {
591                 auto ret = Return<void>(Status::ok());
592                 (void)ret;
593             },
594             "");
595     EXPECT_DEATH(
596             {
597                 auto ret = Return<void>(Status::ok());
598                 ret = Return<void>(Status::ok());
599                 ret.isOk();
600             },
601             "");
602 
603     auto ret = Return<void>(Status::ok());
604     (void)ret.isOk();
605     ret = Return<void>(Status::ok());
606     (void)ret.isOk();
607 
608     setProcessHidlReturnRestriction(HidlReturnRestriction::NONE);
609 }
610 
toString(const::android::hardware::Status & s)611 std::string toString(const ::android::hardware::Status &s) {
612     using ::android::hardware::operator<<;
613     std::ostringstream oss;
614     oss << s;
615     return oss.str();
616 }
617 
TEST_F(LibHidlTest,StatusStringTest)618 TEST_F(LibHidlTest, StatusStringTest) {
619     using namespace ::android;
620     using ::android::hardware::Status;
621     using ::testing::HasSubstr;
622 
623     EXPECT_EQ(toString(Status::ok()), "No error");
624 
625     EXPECT_THAT(toString(Status::fromStatusT(DEAD_OBJECT)), HasSubstr("DEAD_OBJECT"));
626 
627     EXPECT_THAT(toString(Status::fromStatusT(-EBUSY)), HasSubstr("busy"));
628 
629     EXPECT_THAT(toString(Status::fromExceptionCode(Status::EX_NULL_POINTER)),
630             HasSubstr("EX_NULL_POINTER"));
631 }
632 
TEST_F(LibHidlTest,PreloadTest)633 TEST_F(LibHidlTest, PreloadTest) {
634     // HIDL doesn't have support to load passthrough implementations on host, but we
635     // could do this by loading implementations from the output directory
636     if (!kAndroid) GTEST_SKIP();
637 
638     using ::android::hardware::preloadPassthroughService;
639     using ::android::hidl::memory::V1_0::IMemory;
640 
641     // installed on all devices by default in both bitnesses and not otherwise a dependency of this
642     // test.
643     static const std::string kLib = "android.hidl.memory@1.0-impl.so";
644 
645     EXPECT_FALSE(isLibraryOpen(kLib));
646     preloadPassthroughService<IMemory>();
647     EXPECT_TRUE(isLibraryOpen(kLib));
648 }
649 
650 template <typename T, size_t start, size_t end>
assertZeroInRange(const T * t)651 static void assertZeroInRange(const T* t) {
652     static_assert(start < sizeof(T));
653     static_assert(end <= sizeof(T));
654 
655     const uint8_t* ptr = reinterpret_cast<const uint8_t*>(t);
656 
657     for (size_t i = start; i < end; i++) {
658         EXPECT_EQ(0, ptr[i]);
659     }
660 }
661 
662 template <typename T, size_t start, size_t end>
uninitTest()663 static void uninitTest() {
664     uint8_t buf[sizeof(T)];
665     memset(buf, 0xFF, sizeof(T));
666 
667     T* type = new (buf) T;
668     assertZeroInRange<T, start, end>(type);
669     type->~T();
670 }
671 
TEST_F(LibHidlTest,HidlVecUninit)672 TEST_F(LibHidlTest, HidlVecUninit) {
673     using ::android::hardware::hidl_vec;
674     struct SomeType {};
675     static_assert(sizeof(hidl_vec<SomeType>) == 16);
676 
677     // padding after mOwnsBuffer
678     uninitTest<hidl_vec<SomeType>, 13, 16>();
679 }
TEST_F(LibHidlTest,HidlHandleUninit)680 TEST_F(LibHidlTest, HidlHandleUninit) {
681     using ::android::hardware::hidl_handle;
682     static_assert(sizeof(hidl_handle) == 16);
683 
684     // padding after mOwnsHandle
685     uninitTest<hidl_handle, 9, 16>();
686 }
TEST_F(LibHidlTest,HidlStringUninit)687 TEST_F(LibHidlTest, HidlStringUninit) {
688     using ::android::hardware::hidl_string;
689     static_assert(sizeof(hidl_string) == 16);
690 
691     // padding after mOwnsBuffer
692     uninitTest<hidl_string, 13, 16>();
693 }
694 
main(int argc,char ** argv)695 int main(int argc, char **argv) {
696     ::testing::InitGoogleTest(&argc, argv);
697     return RUN_ALL_TESTS();
698 }
699