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annotate unittests/Support/MemoryBufferTest.cpp @ 146:3fc4d5c3e21e

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set tail call flag for code segment in CGCAll
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sun, 23 Dec 2018 19:23:36 +0900
parents 3a76565eade5
children c2174574ed3a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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/MemoryBuffer.h"
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15 #include "llvm/Support/FileSystem.h"
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16 #include "llvm/Support/FileUtilities.h"
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17 #include "llvm/Support/raw_ostream.h"
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18 #include "llvm/Testing/Support/Error.h"
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19 #include "gtest/gtest.h"
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20
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21 using namespace llvm;
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22
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23 namespace {
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24
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25 class MemoryBufferTest : public testing::Test {
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26 protected:
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27 MemoryBufferTest()
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28 : data("this is some data")
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29 { }
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31 void SetUp() override {}
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32
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33 /// Common testing for different modes of getOpenFileSlice.
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34 /// Creates a temporary file with known contents, and uses
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35 /// MemoryBuffer::getOpenFileSlice to map it.
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36 /// If \p Reopen is true, the file is closed after creating and reopened
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37 /// anew before using MemoryBuffer.
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38 void testGetOpenFileSlice(bool Reopen);
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39
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40 typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
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41
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42 std::string data;
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43 };
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44
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45 TEST_F(MemoryBufferTest, get) {
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46 // Default name and null-terminator flag
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47 OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
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48 EXPECT_TRUE(nullptr != MB1.get());
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49
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50 // RequiresNullTerminator = false
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51 OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
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52 EXPECT_TRUE(nullptr != MB2.get());
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53
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54 // RequiresNullTerminator = true
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55 OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
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56 EXPECT_TRUE(nullptr != MB3.get());
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57
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58 // verify all 3 buffers point to the same address
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59 EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
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60 EXPECT_EQ(MB2->getBufferStart(), MB3->getBufferStart());
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61
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62 // verify the original data is unmodified after deleting the buffers
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63 MB1.reset();
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64 MB2.reset();
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65 MB3.reset();
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66 EXPECT_EQ("this is some data", data);
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67 }
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68
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69 TEST_F(MemoryBufferTest, NullTerminator4K) {
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70 // Test that a file with size that is a multiple of the page size can be null
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71 // terminated correctly by MemoryBuffer.
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72 int TestFD;
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73 SmallString<64> TestPath;
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74 sys::fs::createTemporaryFile("MemoryBufferTest_NullTerminator4K", "temp",
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75 TestFD, TestPath);
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76 FileRemover Cleanup(TestPath);
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77 raw_fd_ostream OF(TestFD, true, /*unbuffered=*/true);
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78 for (unsigned i = 0; i < 4096 / 16; ++i) {
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79 OF << "0123456789abcdef";
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80 }
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81 OF.close();
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82
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83 ErrorOr<OwningBuffer> MB = MemoryBuffer::getFile(TestPath.c_str());
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84 std::error_code EC = MB.getError();
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85 ASSERT_FALSE(EC);
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86
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87 const char *BufData = MB.get()->getBufferStart();
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88 EXPECT_EQ('f', BufData[4095]);
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89 EXPECT_EQ('\0', BufData[4096]);
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90 }
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91
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92 TEST_F(MemoryBufferTest, copy) {
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93 // copy with no name
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94 OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
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95 EXPECT_TRUE(nullptr != MBC1.get());
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96
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97 // copy with a name
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98 OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
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99 EXPECT_TRUE(nullptr != MBC2.get());
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100
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101 // verify the two copies do not point to the same place
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102 EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
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103 }
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104
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105 TEST_F(MemoryBufferTest, make_new) {
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106 // 0-sized buffer
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107 OwningBuffer Zero(WritableMemoryBuffer::getNewUninitMemBuffer(0));
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108 EXPECT_TRUE(nullptr != Zero.get());
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109
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110 // uninitialized buffer with no name
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111 OwningBuffer One(WritableMemoryBuffer::getNewUninitMemBuffer(321));
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112 EXPECT_TRUE(nullptr != One.get());
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113
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114 // uninitialized buffer with name
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115 OwningBuffer Two(WritableMemoryBuffer::getNewUninitMemBuffer(123, "bla"));
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116 EXPECT_TRUE(nullptr != Two.get());
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117
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118 // 0-initialized buffer with no name
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119 OwningBuffer Three(WritableMemoryBuffer::getNewMemBuffer(321, data));
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120 EXPECT_TRUE(nullptr != Three.get());
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121 for (size_t i = 0; i < 321; ++i)
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122 EXPECT_EQ(0, Three->getBufferStart()[0]);
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123
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124 // 0-initialized buffer with name
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125 OwningBuffer Four(WritableMemoryBuffer::getNewMemBuffer(123, "zeros"));
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126 EXPECT_TRUE(nullptr != Four.get());
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127 for (size_t i = 0; i < 123; ++i)
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128 EXPECT_EQ(0, Four->getBufferStart()[0]);
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129 }
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130
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131 void MemoryBufferTest::testGetOpenFileSlice(bool Reopen) {
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132 // Test that MemoryBuffer::getOpenFile works properly when no null
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133 // terminator is requested and the size is large enough to trigger
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134 // the usage of memory mapping.
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135 int TestFD;
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136 SmallString<64> TestPath;
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137 // Create a temporary file and write data into it.
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138 sys::fs::createTemporaryFile("prefix", "temp", TestFD, TestPath);
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139 FileRemover Cleanup(TestPath);
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140 // OF is responsible for closing the file; If the file is not
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141 // reopened, it will be unbuffered so that the results are
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142 // immediately visible through the fd.
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143 raw_fd_ostream OF(TestFD, true, !Reopen);
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144 for (int i = 0; i < 60000; ++i) {
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145 OF << "0123456789";
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146 }
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147
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148 if (Reopen) {
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149 OF.close();
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150 EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
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151 }
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152
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153 ErrorOr<OwningBuffer> Buf =
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154 MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(),
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155 40000, // Size
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156 80000 // Offset
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157 );
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158
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159 std::error_code EC = Buf.getError();
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160 EXPECT_FALSE(EC);
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161
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162 StringRef BufData = Buf.get()->getBuffer();
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163 EXPECT_EQ(BufData.size(), 40000U);
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164 EXPECT_EQ(BufData[0], '0');
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165 EXPECT_EQ(BufData[9], '9');
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166 }
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167
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168 TEST_F(MemoryBufferTest, getOpenFileNoReopen) {
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169 testGetOpenFileSlice(false);
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170 }
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171
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172 TEST_F(MemoryBufferTest, getOpenFileReopened) {
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173 testGetOpenFileSlice(true);
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174 }
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175
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176 TEST_F(MemoryBufferTest, reference) {
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177 OwningBuffer MB(MemoryBuffer::getMemBuffer(data));
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178 MemoryBufferRef MBR(*MB);
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179
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180 EXPECT_EQ(MB->getBufferStart(), MBR.getBufferStart());
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181 EXPECT_EQ(MB->getBufferIdentifier(), MBR.getBufferIdentifier());
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182 }
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183
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184 TEST_F(MemoryBufferTest, slice) {
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185 // Create a file that is six pages long with different data on each page.
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186 int FD;
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187 SmallString<64> TestPath;
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188 sys::fs::createTemporaryFile("MemoryBufferTest_Slice", "temp", FD, TestPath);
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189 FileRemover Cleanup(TestPath);
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190 raw_fd_ostream OF(FD, true, /*unbuffered=*/true);
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191 for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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192 OF << "12345678";
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193 }
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194 for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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195 OF << "abcdefgh";
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196 }
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197 for (unsigned i = 0; i < 0x2000 / 8; ++i) {
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198 OF << "ABCDEFGH";
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199 }
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200 OF.close();
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201
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202 // Try offset of one page.
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203 ErrorOr<OwningBuffer> MB = MemoryBuffer::getFileSlice(TestPath.str(),
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204 0x4000, 0x1000);
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205 std::error_code EC = MB.getError();
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206 ASSERT_FALSE(EC);
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207 EXPECT_EQ(0x4000UL, MB.get()->getBufferSize());
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208
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209 StringRef BufData = MB.get()->getBuffer();
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210 EXPECT_TRUE(BufData.substr(0x0000,8).equals("12345678"));
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211 EXPECT_TRUE(BufData.substr(0x0FF8,8).equals("12345678"));
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212 EXPECT_TRUE(BufData.substr(0x1000,8).equals("abcdefgh"));
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213 EXPECT_TRUE(BufData.substr(0x2FF8,8).equals("abcdefgh"));
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214 EXPECT_TRUE(BufData.substr(0x3000,8).equals("ABCDEFGH"));
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215 EXPECT_TRUE(BufData.substr(0x3FF8,8).equals("ABCDEFGH"));
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216
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217 // Try non-page aligned.
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218 ErrorOr<OwningBuffer> MB2 = MemoryBuffer::getFileSlice(TestPath.str(),
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219 0x3000, 0x0800);
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220 EC = MB2.getError();
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221 ASSERT_FALSE(EC);
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222 EXPECT_EQ(0x3000UL, MB2.get()->getBufferSize());
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223
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224 StringRef BufData2 = MB2.get()->getBuffer();
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225 EXPECT_TRUE(BufData2.substr(0x0000,8).equals("12345678"));
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226 EXPECT_TRUE(BufData2.substr(0x17F8,8).equals("12345678"));
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227 EXPECT_TRUE(BufData2.substr(0x1800,8).equals("abcdefgh"));
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228 EXPECT_TRUE(BufData2.substr(0x2FF8,8).equals("abcdefgh"));
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229 }
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230
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231 TEST_F(MemoryBufferTest, writableSlice) {
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232 // Create a file initialized with some data
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233 int FD;
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234 SmallString<64> TestPath;
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235 sys::fs::createTemporaryFile("MemoryBufferTest_WritableSlice", "temp", FD,
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236 TestPath);
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237 FileRemover Cleanup(TestPath);
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238 raw_fd_ostream OF(FD, true);
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239 for (unsigned i = 0; i < 0x1000; ++i)
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240 OF << "0123456789abcdef";
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241 OF.close();
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242
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243 {
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244 auto MBOrError =
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245 WritableMemoryBuffer::getFileSlice(TestPath.str(), 0x6000, 0x2000);
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246 ASSERT_FALSE(MBOrError.getError());
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247 // Write some data. It should be mapped private, so that upon completion
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248 // the original file contents are not modified.
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249 WritableMemoryBuffer &MB = **MBOrError;
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250 ASSERT_EQ(0x6000u, MB.getBufferSize());
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251 char *Start = MB.getBufferStart();
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252 ASSERT_EQ(MB.getBufferEnd(), MB.getBufferStart() + MB.getBufferSize());
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253 ::memset(Start, 'x', MB.getBufferSize());
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254 }
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255
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256 auto MBOrError = MemoryBuffer::getFile(TestPath);
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257 ASSERT_FALSE(MBOrError.getError());
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258 auto &MB = **MBOrError;
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259 ASSERT_EQ(0x10000u, MB.getBufferSize());
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260 for (size_t i = 0; i < MB.getBufferSize(); i += 0x10)
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261 EXPECT_EQ("0123456789abcdef", MB.getBuffer().substr(i, 0x10)) << "i: " << i;
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262 }
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263 }