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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include <limits> | |
6 | |
7 #include "gtest/gtest.h" | |
8 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h" | |
9 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h" | |
10 | |
11 namespace mojo { | |
12 namespace test { | |
13 namespace { | |
14 | |
15 bool IsZero(void* p_buf, size_t size) { | |
16 char* buf = reinterpret_cast<char*>(p_buf); | |
17 for (size_t i = 0; i < size; ++i) { | |
18 if (buf[i] != 0) | |
19 return false; | |
20 } | |
21 return true; | |
22 } | |
23 | |
24 // Tests that you can create a FixedBuffer whose underlying buffer size is not | |
25 // a multiple of 8. | |
26 TEST(FixedBufferTest, UnAlignedBufferSized) { | |
27 char char_buf[10] = {}; | |
28 internal::FixedBuffer fixed_buf; | |
29 fixed_buf.Initialize(char_buf, sizeof(char_buf)); | |
30 } | |
31 | |
32 // Tests that FixedBuffer allocates memory aligned to 8 byte boundaries. | |
33 TEST(FixedBufferTest, Alignment) { | |
34 internal::FixedBufferForTesting buf(internal::Align(10) * 2); | |
35 ASSERT_EQ(buf.size(), 16u * 2); | |
36 | |
37 void* a = buf.Allocate(10); | |
38 ASSERT_TRUE(a); | |
39 EXPECT_TRUE(IsZero(a, 10)); | |
40 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8); | |
41 | |
42 void* b = buf.Allocate(10); | |
43 ASSERT_TRUE(b); | |
44 EXPECT_TRUE(IsZero(b, 10)); | |
45 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8); | |
46 | |
47 // Any more allocations would result in an assert, but we can't test that. | |
48 } | |
49 | |
50 // Tests that FixedBufferForTesting::Leak passes ownership to the caller. | |
51 TEST(FixedBufferTest, Leak) { | |
52 void* ptr = nullptr; | |
53 void* buf_ptr = nullptr; | |
54 { | |
55 internal::FixedBufferForTesting buf(8); | |
56 ASSERT_EQ(8u, buf.size()); | |
57 | |
58 ptr = buf.Allocate(8); | |
59 ASSERT_TRUE(ptr); | |
60 buf_ptr = buf.Leak(); | |
61 | |
62 // The buffer should point to the first element allocated. | |
63 // TODO(mpcomplete): Is this a reasonable expectation? | |
64 EXPECT_EQ(ptr, buf_ptr); | |
65 | |
66 // The FixedBufferForTesting should be empty now. | |
67 EXPECT_EQ(0u, buf.size()); | |
68 EXPECT_FALSE(buf.Leak()); | |
69 } | |
70 | |
71 // Since we called Leak, ptr is still writable after FixedBufferForTesting | |
72 // went out of scope. | |
73 memset(ptr, 1, 8); | |
74 free(buf_ptr); | |
75 } | |
76 | |
77 #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON) | |
78 TEST(FixedBufferTest, TooBig) { | |
79 internal::FixedBufferForTesting buf(24); | |
80 | |
81 // A little bit too large. | |
82 EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32)); | |
83 | |
84 // Move the cursor forward. | |
85 EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16)); | |
86 | |
87 // A lot too large. | |
88 EXPECT_EQ(reinterpret_cast<void*>(0), | |
89 buf.Allocate(std::numeric_limits<size_t>::max() - 1024u)); | |
90 | |
91 // A lot too large, leading to possible integer overflow. | |
92 EXPECT_EQ(reinterpret_cast<void*>(0), | |
93 buf.Allocate(std::numeric_limits<size_t>::max() - 8u)); | |
94 } | |
95 #endif | |
96 | |
97 } // namespace | |
98 } // namespace test | |
99 } // namespace mojo | |
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