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annotate unittests/Support/MemoryBufferTest.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===- llvm/unittest/Support/MemoryBufferTest.cpp - MemoryBuffer tests ----===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements unit tests for the MemoryBuffer support class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/FileSystem.h"
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15 #include "llvm/Support/MemoryBuffer.h"
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16 #include "llvm/Support/raw_ostream.h"
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17 #include "gtest/gtest.h"
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18
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19 using namespace llvm;
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20
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21 namespace {
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22
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23 class MemoryBufferTest : public testing::Test {
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24 protected:
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25 MemoryBufferTest()
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26 : data("this is some data")
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27 { }
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28
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29 virtual void SetUp() { }
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30
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31 /// Common testing for different modes of getOpenFileSlice.
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32 /// Creates a temporary file with known contents, and uses
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33 /// MemoryBuffer::getOpenFileSlice to map it.
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34 /// If \p Reopen is true, the file is closed after creating and reopened
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35 /// anew before using MemoryBuffer.
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36 void testGetOpenFileSlice(bool Reopen);
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37
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38 typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
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39
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40 std::string data;
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41 };
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42
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43 TEST_F(MemoryBufferTest, get) {
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44 // Default name and null-terminator flag
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45 OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
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46 EXPECT_TRUE(nullptr != MB1.get());
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47
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48 // RequiresNullTerminator = false
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49 OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
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50 EXPECT_TRUE(nullptr != MB2.get());
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51
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52 // RequiresNullTerminator = true
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53 OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
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54 EXPECT_TRUE(nullptr != MB3.get());
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55
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56 // verify all 3 buffers point to the same address
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57 EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
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58 EXPECT_EQ(MB2->getBufferStart(), MB3->getBufferStart());
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59
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60 // verify the original data is unmodified after deleting the buffers
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61 MB1.reset();
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62 MB2.reset();
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63 MB3.reset();
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64 EXPECT_EQ("this is some data", data);
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65 }
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66
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67 TEST_F(MemoryBufferTest, NullTerminator4K) {
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68 // Test that a file with size that is a multiple of the page size can be null
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69 // terminated correctly by MemoryBuffer.
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70 int TestFD;
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71 SmallString<64> TestPath;
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72 sys::fs::createTemporaryFile("MemoryBufferTest_NullTerminator4K", "temp",
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73 TestFD, TestPath);
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74 raw_fd_ostream OF(TestFD, true, /*unbuffered=*/true);
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75 for (unsigned i = 0; i < 4096 / 16; ++i) {
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76 OF << "0123456789abcdef";
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77 }
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78 OF.close();
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79
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80 ErrorOr<OwningBuffer> MB = MemoryBuffer::getFile(TestPath.c_str());
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81 std::error_code EC = MB.getError();
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82 ASSERT_FALSE(EC);
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83
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84 const char *BufData = MB.get()->getBufferStart();
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85 EXPECT_EQ('f', BufData[4095]);
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86 EXPECT_EQ('\0', BufData[4096]);
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87 }
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88
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89 TEST_F(MemoryBufferTest, copy) {
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90 // copy with no name
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91 OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
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92 EXPECT_TRUE(nullptr != MBC1.get());
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93
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94 // copy with a name
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95 OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
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96 EXPECT_TRUE(nullptr != MBC2.get());
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97
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98 // verify the two copies do not point to the same place
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99 EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
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100 }
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101
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102 TEST_F(MemoryBufferTest, make_new) {
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103 // 0-sized buffer
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104 OwningBuffer Zero(MemoryBuffer::getNewUninitMemBuffer(0));
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105 EXPECT_TRUE(nullptr != Zero.get());
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106
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107 // uninitialized buffer with no name
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108 OwningBuffer One(MemoryBuffer::getNewUninitMemBuffer(321));
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109 EXPECT_TRUE(nullptr != One.get());
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110
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111 // uninitialized buffer with name
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112 OwningBuffer Two(MemoryBuffer::getNewUninitMemBuffer(123, "bla"));
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113 EXPECT_TRUE(nullptr != Two.get());
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114
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115 // 0-initialized buffer with no name
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116 OwningBuffer Three(MemoryBuffer::getNewMemBuffer(321, data));
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117 EXPECT_TRUE(nullptr != Three.get());
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118 for (size_t i = 0; i < 321; ++i)
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119 EXPECT_EQ(0, Three->getBufferStart()[0]);
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120
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121 // 0-initialized buffer with name
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122 OwningBuffer Four(MemoryBuffer::getNewMemBuffer(123, "zeros"));
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123 EXPECT_TRUE(nullptr != Four.get());
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124 for (size_t i = 0; i < 123; ++i)
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125 EXPECT_EQ(0, Four->getBufferStart()[0]);
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126 }
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127
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128 void MemoryBufferTest::testGetOpenFileSlice(bool Reopen) {
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129 // Test that MemoryBuffer::getOpenFile works properly when no null
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130 // terminator is requested and the size is large enough to trigger
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131 // the usage of memory mapping.
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132 int TestFD;
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133 SmallString<64> TestPath;
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134 // Create a temporary file and write data into it.
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135 sys::fs::createTemporaryFile("prefix", "temp", TestFD, TestPath);
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136 // OF is responsible for closing the file; If the file is not
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137 // reopened, it will be unbuffered so that the results are
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138 // immediately visible through the fd.
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139 raw_fd_ostream OF(TestFD, true, !Reopen);
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140 for (int i = 0; i < 60000; ++i) {
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141 OF << "0123456789";
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142 }
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143
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144 if (Reopen) {
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145 OF.close();
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146 EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
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147 }
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148
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149 ErrorOr<OwningBuffer> Buf =
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150 MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(),
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151 40000, // Size
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152 80000 // Offset
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153 );
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154
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155 std::error_code EC = Buf.getError();
0
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156 EXPECT_FALSE(EC);
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157
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158 StringRef BufData = Buf.get()->getBuffer();
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159 EXPECT_EQ(BufData.size(), 40000U);
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160 EXPECT_EQ(BufData[0], '0');
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161 EXPECT_EQ(BufData[9], '9');
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162 }
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163
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164 TEST_F(MemoryBufferTest, getOpenFileNoReopen) {
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165 testGetOpenFileSlice(false);
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166 }
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167
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168 TEST_F(MemoryBufferTest, getOpenFileReopened) {
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169 testGetOpenFileSlice(true);
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170 }
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171
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172 }