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 "mojo/public/cpp/bindings/lib/bindings_serialization.h"
8 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
9 #include "testing/gtest/include/gtest/gtest.h"
10
11 namespace mojo {
12 namespace test {
13 namespace {
14
IsZero(void * p_buf,size_t size)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 FixedBuffer allocates memory aligned to 8 byte boundaries.
TEST(FixedBufferTest,Alignment)25 TEST(FixedBufferTest, Alignment) {
26 internal::FixedBuffer buf(internal::Align(10) * 2);
27 ASSERT_EQ(buf.size(), 16u * 2);
28
29 void* a = buf.Allocate(10);
30 ASSERT_TRUE(a);
31 EXPECT_TRUE(IsZero(a, 10));
32 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8);
33
34 void* b = buf.Allocate(10);
35 ASSERT_TRUE(b);
36 EXPECT_TRUE(IsZero(b, 10));
37 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8);
38
39 // Any more allocations would result in an assert, but we can't test that.
40 }
41
42 // Tests that FixedBuffer::Leak passes ownership to the caller.
TEST(FixedBufferTest,Leak)43 TEST(FixedBufferTest, Leak) {
44 void* ptr = NULL;
45 void* buf_ptr = NULL;
46 {
47 internal::FixedBuffer buf(8);
48 ASSERT_EQ(8u, buf.size());
49
50 ptr = buf.Allocate(8);
51 ASSERT_TRUE(ptr);
52 buf_ptr = buf.Leak();
53
54 // The buffer should point to the first element allocated.
55 // TODO(mpcomplete): Is this a reasonable expectation?
56 EXPECT_EQ(ptr, buf_ptr);
57
58 // The FixedBuffer should be empty now.
59 EXPECT_EQ(0u, buf.size());
60 EXPECT_FALSE(buf.Leak());
61 }
62
63 // Since we called Leak, ptr is still writable after FixedBuffer went out of
64 // scope.
65 memset(ptr, 1, 8);
66 free(buf_ptr);
67 }
68
69 #ifdef NDEBUG
TEST(FixedBufferTest,TooBig)70 TEST(FixedBufferTest, TooBig) {
71 internal::FixedBuffer buf(24);
72
73 // A little bit too large.
74 EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32));
75
76 // Move the cursor forward.
77 EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16));
78
79 // A lot too large.
80 EXPECT_EQ(reinterpret_cast<void*>(0),
81 buf.Allocate(std::numeric_limits<size_t>::max() - 1024u));
82
83 // A lot too large, leading to possible integer overflow.
84 EXPECT_EQ(reinterpret_cast<void*>(0),
85 buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
86 }
87 #endif
88
89 } // namespace
90 } // namespace test
91 } // namespace mojo
92