1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/system/raw_shared_buffer.h"
#include <limits>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace mojo {
namespace system {
namespace {
TEST(RawSharedBufferTest, Basic) {
const size_t kNumInts = 100;
const size_t kNumBytes = kNumInts * sizeof(int);
// A fudge so that we're not just writing zero bytes 75% of the time.
const int kFudge = 1234567890;
// Make some memory.
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(kNumBytes));
ASSERT_TRUE(buffer);
// Map it all, scribble some stuff, and then unmap it.
{
EXPECT_TRUE(buffer->IsValidMap(0, kNumBytes));
scoped_ptr<RawSharedBufferMapping> mapping(buffer->Map(0, kNumBytes));
ASSERT_TRUE(mapping);
ASSERT_TRUE(mapping->base());
int* stuff = static_cast<int*>(mapping->base());
for (size_t i = 0; i < kNumInts; i++)
stuff[i] = static_cast<int>(i) + kFudge;
}
// Map it all again, check that our scribbling is still there, then do a
// partial mapping and scribble on that, check that everything is coherent,
// unmap the first mapping, scribble on some of the second mapping, and then
// unmap it.
{
ASSERT_TRUE(buffer->IsValidMap(0, kNumBytes));
// Use |MapNoCheck()| this time.
scoped_ptr<RawSharedBufferMapping> mapping1(
buffer->MapNoCheck(0, kNumBytes));
ASSERT_TRUE(mapping1);
ASSERT_TRUE(mapping1->base());
int* stuff1 = static_cast<int*>(mapping1->base());
for (size_t i = 0; i < kNumInts; i++)
EXPECT_EQ(static_cast<int>(i) + kFudge, stuff1[i]) << i;
scoped_ptr<RawSharedBufferMapping> mapping2(
buffer->Map((kNumInts / 2) * sizeof(int), 2 * sizeof(int)));
ASSERT_TRUE(mapping2);
ASSERT_TRUE(mapping2->base());
int* stuff2 = static_cast<int*>(mapping2->base());
EXPECT_EQ(static_cast<int>(kNumInts / 2) + kFudge, stuff2[0]);
EXPECT_EQ(static_cast<int>(kNumInts / 2) + 1 + kFudge, stuff2[1]);
stuff2[0] = 123;
stuff2[1] = 456;
EXPECT_EQ(123, stuff1[kNumInts / 2]);
EXPECT_EQ(456, stuff1[kNumInts / 2 + 1]);
mapping1.reset();
EXPECT_EQ(123, stuff2[0]);
EXPECT_EQ(456, stuff2[1]);
stuff2[1] = 789;
}
// Do another partial mapping and check that everything is the way we expect
// it to be.
{
EXPECT_TRUE(buffer->IsValidMap(sizeof(int), kNumBytes - sizeof(int)));
scoped_ptr<RawSharedBufferMapping> mapping(
buffer->Map(sizeof(int), kNumBytes - sizeof(int)));
ASSERT_TRUE(mapping);
ASSERT_TRUE(mapping->base());
int* stuff = static_cast<int*>(mapping->base());
for (size_t j = 0; j < kNumInts - 1; j++) {
int i = static_cast<int>(j) + 1;
if (i == kNumInts / 2) {
EXPECT_EQ(123, stuff[j]);
} else if (i == kNumInts / 2 + 1) {
EXPECT_EQ(789, stuff[j]);
} else {
EXPECT_EQ(i + kFudge, stuff[j]) << i;
}
}
}
}
// TODO(vtl): Bigger buffers.
TEST(RawSharedBufferTest, InvalidMappings) {
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(100));
ASSERT_TRUE(buffer);
// Zero length not allowed.
EXPECT_FALSE(buffer->Map(0, 0));
EXPECT_FALSE(buffer->IsValidMap(0, 0));
// Okay:
EXPECT_TRUE(buffer->Map(0, 100));
EXPECT_TRUE(buffer->IsValidMap(0, 100));
// Offset + length too big.
EXPECT_FALSE(buffer->Map(0, 101));
EXPECT_FALSE(buffer->IsValidMap(0, 101));
EXPECT_FALSE(buffer->Map(1, 100));
EXPECT_FALSE(buffer->IsValidMap(1, 100));
// Okay:
EXPECT_TRUE(buffer->Map(50, 50));
EXPECT_TRUE(buffer->IsValidMap(50, 50));
// Offset + length too big.
EXPECT_FALSE(buffer->Map(50, 51));
EXPECT_FALSE(buffer->IsValidMap(50, 51));
EXPECT_FALSE(buffer->Map(51, 50));
EXPECT_FALSE(buffer->IsValidMap(51, 50));
}
TEST(RawSharedBufferTest, TooBig) {
// If |size_t| is 32-bit, it's quite possible/likely that |Create()| succeeds
// (since it only involves creating a 4 GB file).
const size_t kMaxSizeT = std::numeric_limits<size_t>::max();
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(kMaxSizeT));
// But, assuming |sizeof(size_t) == sizeof(void*)|, mapping all of it should
// always fail.
if (buffer)
EXPECT_FALSE(buffer->Map(0, kMaxSizeT));
}
// Tests that separate mappings get distinct addresses.
// Note: It's not inconceivable that the OS could ref-count identical mappings
// and reuse the same address, in which case we'd have to be more careful about
// using the address as the key for unmapping.
TEST(RawSharedBufferTest, MappingsDistinct) {
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(100));
scoped_ptr<RawSharedBufferMapping> mapping1(buffer->Map(0, 100));
scoped_ptr<RawSharedBufferMapping> mapping2(buffer->Map(0, 100));
EXPECT_NE(mapping1->base(), mapping2->base());
}
TEST(RawSharedBufferTest, BufferZeroInitialized) {
static const size_t kSizes[] = { 10, 100, 1000, 10000, 100000 };
for (size_t i = 0; i < arraysize(kSizes); i++) {
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(kSizes[i]));
scoped_ptr<RawSharedBufferMapping> mapping(buffer->Map(0, kSizes[i]));
for (size_t j = 0; j < kSizes[i]; j++) {
// "Assert" instead of "expect" so we don't spam the output with thousands
// of failures if we fail.
ASSERT_EQ('\0', static_cast<char*>(mapping->base())[j])
<< "size " << kSizes[i] << ", offset " << j;
}
}
}
TEST(RawSharedBufferTest, MappingsOutliveBuffer) {
scoped_ptr<RawSharedBufferMapping> mapping1;
scoped_ptr<RawSharedBufferMapping> mapping2;
{
scoped_refptr<RawSharedBuffer> buffer(RawSharedBuffer::Create(100));
mapping1 = buffer->Map(0, 100).Pass();
mapping2 = buffer->Map(50, 50).Pass();
static_cast<char*>(mapping1->base())[50] = 'x';
}
EXPECT_EQ('x', static_cast<char*>(mapping2->base())[0]);
static_cast<char*>(mapping2->base())[1] = 'y';
EXPECT_EQ('y', static_cast<char*>(mapping1->base())[51]);
}
} // namespace
} // namespace system
} // namespace mojo
|
