2 * Copyright (c) 2011 The Native Client Authors. All rights reserved.
3 * Use of this source code is governed by a BSD-style license that can be
4 * found in the LICENSE file.
8 * Unit tests for struct NCInstBytes in ncinstbuffer.{h,cc}.
11 #ifndef NACL_TRUSTED_BUT_NOT_TCB
12 #error("This file is not meant for use in the TCB")
17 #include "gtest/gtest.h"
19 #include "native_client/src/trusted/validator/x86/ncinstbuffer.h"
23 /* Constant defining maximum buffer size for memory. */
24 const size_t kMaxBufferSize = 30;
26 /* Test harness for class NCRemainingMemory. */
27 class NCInstBytesTests : public ::testing::Test {
32 /* Data for testing. */
33 NCInstBytes _bytes; /* Inst bytes (read). */
34 NCRemainingMemory _memory; /* Memory being tested. */
35 uint8_t _buffer[kMaxBufferSize]; /* Memory buffer to use. */
36 const size_t _buffer_size; /* Actually size of test data. */
37 static const char* kTestData; /* Data put into memory for testing. */
39 /* Verify if the contents of kTestData matches the contents
40 * of _bytes, up to _buffer_size; Remaining elements are zero.
42 void VerifyBytesMatchTestData();
45 const char* NCInstBytesTests::kTestData = "Test data";
47 NCInstBytesTests::NCInstBytesTests()
48 : _buffer_size(strlen(kTestData)) {
49 /* Fill memory buffer with bad test data, so that we know if bad accesses
50 * occur past the end of the buffer.
52 for (size_t i = 0; i < kMaxBufferSize; ++i) {
55 /* Now fill in the good test data. */
56 for (size_t i = 0; i < _buffer_size; ++i) {
57 _buffer[i] = (uint8_t) kTestData[i];
61 void NCInstBytesTests::VerifyBytesMatchTestData() {
62 /* First show that while there is real data in the memory,
63 * it has been copied to the bytes buffer.
66 (_bytes.length <= _buffer_size) ? _bytes.length : _buffer_size;
67 for (size_t i = 0; i < match_limit; ++i) {
68 EXPECT_EQ(_bytes.byte[i], kTestData[i])
69 << "value verification of byte " << i;
71 /* Now show that any remaining bytes (after the memory
72 * has been read) are 0.
74 for (size_t i = match_limit; i < _bytes.length; ++i) {
75 EXPECT_EQ(0, _bytes.byte[i])
76 << "zero verification of byte " << i;
80 void NCInstBytesTests::SetUp() {
81 NCRemainingMemoryInit(_buffer, _buffer_size, &_memory);
82 NCInstBytesInitMemory(&_bytes, &_memory);
83 /* Be sure to verify that we can run the tests, which require
84 * a couple of extra slots for overflow.
86 ASSERT_LT(_buffer_size + 1, (size_t) MAX_INST_LENGTH)
87 << "Set up failed due to kTestData being too long.";
90 /* Test function NCInstBytesPeek, and see if it properly sees the data in
91 * the instruction buffer.
93 TEST_F(NCInstBytesTests, PeekGetsData) {
94 /* First verify that we get text as defined in the test data. */
95 for (size_t i = 0; i < _buffer_size; ++i) {
96 EXPECT_EQ(NCInstBytesPeek(&_bytes, i), (uint8_t) kTestData[i])
97 << "peeking " << i << " bytes ahead.";
99 /* Now verify that if we look past the end of the data, we
102 EXPECT_EQ(0, NCInstBytesPeek(&_bytes, _buffer_size))
103 << "peeking one byte past end of buffer.";
104 EXPECT_EQ(0, NCInstBytesPeek(&_bytes, _buffer_size + 100))
105 << "peeking 100 bytes past end of buffer.";
106 EXPECT_EQ(0, _bytes.length);
107 VerifyBytesMatchTestData();
110 /* Test function NCInstBytesRead, and see if it properly read
111 * data from the memory buffer.
113 TEST_F(NCInstBytesTests, ReadGetsData) {
114 /* First verify that we get text as defined in the test data. */
115 for (size_t i = 0; i < _buffer_size; ++i) {
116 EXPECT_EQ(NCInstBytesRead(&_bytes), (uint8_t) kTestData[i])
117 << "after reading " << i << " characters";
118 VerifyBytesMatchTestData();
120 EXPECT_EQ(_buffer_size, _bytes.length);
121 VerifyBytesMatchTestData();
122 /* Now verify that zero is returned for any additional reads. */
123 for (size_t i = _bytes.length; i < MAX_INST_LENGTH; ++i) {
124 EXPECT_EQ(0, NCInstBytesRead(&_bytes))
125 << "after reading all characters";
127 VerifyBytesMatchTestData();
128 /* Verify that we can apply a read, even if buffer overflow occurs,
129 * and the only effect is that the buffer length is not increased.
131 EXPECT_EQ(MAX_INST_LENGTH, _bytes.length);
132 EXPECT_EQ(0, NCInstBytesRead(&_bytes));
133 EXPECT_EQ(MAX_INST_LENGTH, _bytes.length);
136 /* Test function NCInstBytesReadBytes, and see if it properly reads
137 * data from the memory buffer.
139 TEST_F(NCInstBytesTests, ReadBytesGetsData) {
140 /* First verify that we get text as defined in the test data. */
141 size_t chars_read = 0;
143 VerifyBytesMatchTestData();
144 while (chars_read < MAX_INST_LENGTH) {
145 if ((chars_read + stride) > MAX_INST_LENGTH) {
146 stride = MAX_INST_LENGTH - chars_read;
148 NCInstBytesReadBytes(stride, &_bytes);
149 chars_read += stride;
150 VerifyBytesMatchTestData();
152 /* Verify that we can apply additional reads without overflowing
155 NCInstBytesReadBytes(2, &_bytes);
156 EXPECT_EQ(MAX_INST_LENGTH, _bytes.length) << "Buffer overflow fix failed.";
159 /* Test function NCInstBytesReset, and see if we back up to
160 * the beginning of the instruction.
162 TEST_F(NCInstBytesTests, Reset) {
163 /* First read some bytes into the bytes buffer. */
164 NCInstBytesReadBytes(5, &_bytes);
165 VerifyBytesMatchTestData();
166 /* Now reset and see if we moved back. */
167 NCInstBytesReset(&_bytes);
168 EXPECT_EQ(0, _bytes.length) << "Reset didn't fix buffer length.";
169 VerifyBytesMatchTestData();
170 EXPECT_EQ(0, _memory.read_length) << "Reset didn't fix memory length.";
171 EXPECT_EQ(0, _memory.overflow_count) << "Reset didn't fix memory overflow.";
172 EXPECT_EQ((void*) _buffer, (void*) _memory.cur_pos)
173 << "Reset did not reset memory.";
176 }; // anonymous namespace
178 int main(int argc, char *argv[]) {
179 testing::InitGoogleTest(&argc, argv);
180 return RUN_ALL_TESTS();