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annotate unittests/ExecutionEngine/MCJIT/MCJITObjectCacheTest.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 //===- MCJITObjectCacheTest.cpp - Unit tests for MCJIT object caching -----===//
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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 #include "MCJITTestBase.h"
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11 #include "llvm/ADT/SmallVector.h"
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12 #include "llvm/ADT/StringMap.h"
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13 #include "llvm/ADT/StringSet.h"
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14 #include "llvm/ExecutionEngine/MCJIT.h"
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15 #include "llvm/ExecutionEngine/ObjectCache.h"
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16 #include "llvm/ExecutionEngine/SectionMemoryManager.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 TestObjectCache : public ObjectCache {
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24 public:
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25 TestObjectCache() : DuplicateInserted(false) { }
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26
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27 void notifyObjectCompiled(const Module *M, MemoryBufferRef Obj) override {
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28 // If we've seen this module before, note that.
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29 const std::string ModuleID = M->getModuleIdentifier();
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30 if (ObjMap.find(ModuleID) != ObjMap.end())
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31 DuplicateInserted = true;
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32 // Store a copy of the buffer in our map.
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33 ObjMap[ModuleID] = copyBuffer(Obj);
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34 }
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35
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36 virtual std::unique_ptr<MemoryBuffer> getObject(const Module* M) {
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37 const MemoryBuffer* BufferFound = getObjectInternal(M);
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38 ModulesLookedUp.insert(M->getModuleIdentifier());
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39 if (!BufferFound)
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40 return nullptr;
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41 // Our test cache wants to maintain ownership of its object buffers
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42 // so we make a copy here for the execution engine.
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43 return MemoryBuffer::getMemBufferCopy(BufferFound->getBuffer());
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44 }
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45
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46 // Test-harness-specific functions
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47 bool wereDuplicatesInserted() { return DuplicateInserted; }
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48
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49 bool wasModuleLookedUp(const Module *M) {
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50 return ModulesLookedUp.find(M->getModuleIdentifier())
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51 != ModulesLookedUp.end();
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52 }
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53
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54 const MemoryBuffer* getObjectInternal(const Module* M) {
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55 // Look for the module in our map.
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56 const std::string ModuleID = M->getModuleIdentifier();
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57 StringMap<const MemoryBuffer *>::iterator it = ObjMap.find(ModuleID);
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58 if (it == ObjMap.end())
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59 return nullptr;
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60 return it->second;
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61 }
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62
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63 private:
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64 MemoryBuffer *copyBuffer(MemoryBufferRef Buf) {
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65 // Create a local copy of the buffer.
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66 std::unique_ptr<MemoryBuffer> NewBuffer =
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67 MemoryBuffer::getMemBufferCopy(Buf.getBuffer());
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68 MemoryBuffer *Ret = NewBuffer.get();
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69 AllocatedBuffers.push_back(std::move(NewBuffer));
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70 return Ret;
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71 }
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72
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73 StringMap<const MemoryBuffer *> ObjMap;
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74 StringSet<> ModulesLookedUp;
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75 SmallVector<std::unique_ptr<MemoryBuffer>, 2> AllocatedBuffers;
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76 bool DuplicateInserted;
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77 };
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78
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79 class MCJITObjectCacheTest : public testing::Test, public MCJITTestBase {
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80 protected:
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81
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82 enum {
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83 OriginalRC = 6,
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84 ReplacementRC = 7
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85 };
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86
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87 virtual void SetUp() {
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88 M.reset(createEmptyModule("<main>"));
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89 Main = insertMainFunction(M.get(), OriginalRC);
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90 }
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91
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92 void compileAndRun(int ExpectedRC = OriginalRC) {
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93 // This function shouldn't be called until after SetUp.
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94 ASSERT_TRUE(bool(TheJIT));
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95 ASSERT_TRUE(nullptr != Main);
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96
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97 // We may be using a null cache, so ensure compilation is valid.
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98 TheJIT->finalizeObject();
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99 void *vPtr = TheJIT->getPointerToFunction(Main);
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100
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101 EXPECT_TRUE(nullptr != vPtr)
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102 << "Unable to get pointer to main() from JIT";
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103
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104 int (*FuncPtr)(void) = (int(*)(void))(intptr_t)vPtr;
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105 int returnCode = FuncPtr();
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106 EXPECT_EQ(returnCode, ExpectedRC);
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107 }
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108
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109 Function *Main;
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110 };
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111
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112 TEST_F(MCJITObjectCacheTest, SetNullObjectCache) {
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113 SKIP_UNSUPPORTED_PLATFORM;
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114
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115 createJIT(std::move(M));
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116
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117 TheJIT->setObjectCache(nullptr);
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118
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119 compileAndRun();
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120 }
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121
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122
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123 TEST_F(MCJITObjectCacheTest, VerifyBasicObjectCaching) {
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124 SKIP_UNSUPPORTED_PLATFORM;
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125
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126 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
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127
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128 // Save a copy of the module pointer before handing it off to MCJIT.
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129 const Module * SavedModulePointer = M.get();
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130
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131 createJIT(std::move(M));
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132
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133 TheJIT->setObjectCache(Cache.get());
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134
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135 // Verify that our object cache does not contain the module yet.
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136 const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
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137 EXPECT_EQ(nullptr, ObjBuffer);
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138
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139 compileAndRun();
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140
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141 // Verify that MCJIT tried to look-up this module in the cache.
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142 EXPECT_TRUE(Cache->wasModuleLookedUp(SavedModulePointer));
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143
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144 // Verify that our object cache now contains the module.
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145 ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
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146 EXPECT_TRUE(nullptr != ObjBuffer);
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147
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148 // Verify that the cache was only notified once.
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149 EXPECT_FALSE(Cache->wereDuplicatesInserted());
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150 }
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151
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152 TEST_F(MCJITObjectCacheTest, VerifyLoadFromCache) {
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153 SKIP_UNSUPPORTED_PLATFORM;
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154
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155 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
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156
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157 // Compile this module with an MCJIT engine
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158 createJIT(std::move(M));
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159 TheJIT->setObjectCache(Cache.get());
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160 TheJIT->finalizeObject();
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161
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162 // Destroy the MCJIT engine we just used
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163 TheJIT.reset();
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164
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165 // Create a new memory manager.
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166 MM = new SectionMemoryManager;
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167
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168 // Create a new module and save it. Use a different return code so we can
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169 // tell if MCJIT compiled this module or used the cache.
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170 M.reset(createEmptyModule("<main>"));
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171 Main = insertMainFunction(M.get(), ReplacementRC);
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172 const Module * SecondModulePointer = M.get();
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173
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174 // Create a new MCJIT instance to load this module then execute it.
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175 createJIT(std::move(M));
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176 TheJIT->setObjectCache(Cache.get());
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177 compileAndRun();
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178
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179 // Verify that MCJIT tried to look-up this module in the cache.
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180 EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
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181
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182 // Verify that MCJIT didn't try to cache this again.
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183 EXPECT_FALSE(Cache->wereDuplicatesInserted());
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184 }
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185
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186 TEST_F(MCJITObjectCacheTest, VerifyNonLoadFromCache) {
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187 SKIP_UNSUPPORTED_PLATFORM;
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188
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189 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
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190
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191 // Compile this module with an MCJIT engine
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192 createJIT(std::move(M));
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193 TheJIT->setObjectCache(Cache.get());
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194 TheJIT->finalizeObject();
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195
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196 // Destroy the MCJIT engine we just used
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197 TheJIT.reset();
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198
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199 // Create a new memory manager.
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200 MM = new SectionMemoryManager;
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201
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202 // Create a new module and save it. Use a different return code so we can
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203 // tell if MCJIT compiled this module or used the cache. Note that we use
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204 // a new module name here so the module shouldn't be found in the cache.
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205 M.reset(createEmptyModule("<not-main>"));
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206 Main = insertMainFunction(M.get(), ReplacementRC);
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207 const Module * SecondModulePointer = M.get();
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208
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209 // Create a new MCJIT instance to load this module then execute it.
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210 createJIT(std::move(M));
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211 TheJIT->setObjectCache(Cache.get());
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212
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213 // Verify that our object cache does not contain the module yet.
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214 const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
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215 EXPECT_EQ(nullptr, ObjBuffer);
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216
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217 // Run the function and look for the replacement return code.
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218 compileAndRun(ReplacementRC);
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219
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220 // Verify that MCJIT tried to look-up this module in the cache.
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221 EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
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222
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223 // Verify that our object cache now contains the module.
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224 ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
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225 EXPECT_TRUE(nullptr != ObjBuffer);
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226
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227 // Verify that MCJIT didn't try to cache this again.
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228 EXPECT_FALSE(Cache->wereDuplicatesInserted());
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229 }
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230
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231 } // Namespace
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232