1 //===- MCJITObjectCacheTest.cpp - Unit tests for MCJIT object caching -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "MCJITTestBase.h"
11 #include "llvm/ADT/SmallVector.h"
12 #include "llvm/ADT/StringMap.h"
13 #include "llvm/ADT/StringSet.h"
14 #include "llvm/ExecutionEngine/MCJIT.h"
15 #include "llvm/ExecutionEngine/ObjectCache.h"
16 #include "llvm/ExecutionEngine/SectionMemoryManager.h"
17 #include "gtest/gtest.h"
23 class TestObjectCache : public ObjectCache {
25 TestObjectCache() : DuplicateInserted(false) { }
27 virtual ~TestObjectCache() {
28 // Free any buffers we've allocated.
29 SmallVectorImpl<MemoryBuffer *>::iterator it, end;
30 end = AllocatedBuffers.end();
31 for (it = AllocatedBuffers.begin(); it != end; ++it) {
34 AllocatedBuffers.clear();
37 virtual void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) {
38 // If we've seen this module before, note that.
39 const std::string ModuleID = M->getModuleIdentifier();
40 if (ObjMap.find(ModuleID) != ObjMap.end())
41 DuplicateInserted = true;
42 // Store a copy of the buffer in our map.
43 ObjMap[ModuleID] = copyBuffer(Obj);
46 virtual MemoryBuffer* getObject(const Module* M) {
47 const MemoryBuffer* BufferFound = getObjectInternal(M);
48 ModulesLookedUp.insert(M->getModuleIdentifier());
51 // Our test cache wants to maintain ownership of its object buffers
52 // so we make a copy here for the execution engine.
53 return MemoryBuffer::getMemBufferCopy(BufferFound->getBuffer());
56 // Test-harness-specific functions
57 bool wereDuplicatesInserted() { return DuplicateInserted; }
59 bool wasModuleLookedUp(const Module *M) {
60 return ModulesLookedUp.find(M->getModuleIdentifier())
61 != ModulesLookedUp.end();
64 const MemoryBuffer* getObjectInternal(const Module* M) {
65 // Look for the module in our map.
66 const std::string ModuleID = M->getModuleIdentifier();
67 StringMap<const MemoryBuffer *>::iterator it = ObjMap.find(ModuleID);
68 if (it == ObjMap.end())
74 MemoryBuffer *copyBuffer(const MemoryBuffer *Buf) {
75 // Create a local copy of the buffer.
76 MemoryBuffer *NewBuffer = MemoryBuffer::getMemBufferCopy(Buf->getBuffer());
77 AllocatedBuffers.push_back(NewBuffer);
81 StringMap<const MemoryBuffer *> ObjMap;
82 StringSet<> ModulesLookedUp;
83 SmallVector<MemoryBuffer *, 2> AllocatedBuffers;
84 bool DuplicateInserted;
87 class MCJITObjectCacheTest : public testing::Test, public MCJITTestBase {
95 virtual void SetUp() {
96 M.reset(createEmptyModule("<main>"));
97 Main = insertMainFunction(M.get(), OriginalRC);
100 void compileAndRun(int ExpectedRC = OriginalRC) {
101 // This function shouldn't be called until after SetUp.
102 ASSERT_TRUE(bool(TheJIT));
103 ASSERT_TRUE(nullptr != Main);
105 // We may be using a null cache, so ensure compilation is valid.
106 TheJIT->finalizeObject();
107 void *vPtr = TheJIT->getPointerToFunction(Main);
109 EXPECT_TRUE(nullptr != vPtr)
110 << "Unable to get pointer to main() from JIT";
112 int (*FuncPtr)(void) = (int(*)(void))(intptr_t)vPtr;
113 int returnCode = FuncPtr();
114 EXPECT_EQ(returnCode, ExpectedRC);
120 TEST_F(MCJITObjectCacheTest, SetNullObjectCache) {
121 SKIP_UNSUPPORTED_PLATFORM;
123 createJIT(M.release());
125 TheJIT->setObjectCache(nullptr);
131 TEST_F(MCJITObjectCacheTest, VerifyBasicObjectCaching) {
132 SKIP_UNSUPPORTED_PLATFORM;
134 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
136 // Save a copy of the module pointer before handing it off to MCJIT.
137 const Module * SavedModulePointer = M.get();
139 createJIT(M.release());
141 TheJIT->setObjectCache(Cache.get());
143 // Verify that our object cache does not contain the module yet.
144 const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
145 EXPECT_EQ(nullptr, ObjBuffer);
149 // Verify that MCJIT tried to look-up this module in the cache.
150 EXPECT_TRUE(Cache->wasModuleLookedUp(SavedModulePointer));
152 // Verify that our object cache now contains the module.
153 ObjBuffer = Cache->getObjectInternal(SavedModulePointer);
154 EXPECT_TRUE(nullptr != ObjBuffer);
156 // Verify that the cache was only notified once.
157 EXPECT_FALSE(Cache->wereDuplicatesInserted());
160 TEST_F(MCJITObjectCacheTest, VerifyLoadFromCache) {
161 SKIP_UNSUPPORTED_PLATFORM;
163 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
165 // Compile this module with an MCJIT engine
166 createJIT(M.release());
167 TheJIT->setObjectCache(Cache.get());
168 TheJIT->finalizeObject();
170 // Destroy the MCJIT engine we just used
173 // Create a new memory manager.
174 MM = new SectionMemoryManager;
176 // Create a new module and save it. Use a different return code so we can
177 // tell if MCJIT compiled this module or used the cache.
178 M.reset(createEmptyModule("<main>"));
179 Main = insertMainFunction(M.get(), ReplacementRC);
180 const Module * SecondModulePointer = M.get();
182 // Create a new MCJIT instance to load this module then execute it.
183 createJIT(M.release());
184 TheJIT->setObjectCache(Cache.get());
187 // Verify that MCJIT tried to look-up this module in the cache.
188 EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
190 // Verify that MCJIT didn't try to cache this again.
191 EXPECT_FALSE(Cache->wereDuplicatesInserted());
194 TEST_F(MCJITObjectCacheTest, VerifyNonLoadFromCache) {
195 SKIP_UNSUPPORTED_PLATFORM;
197 std::unique_ptr<TestObjectCache> Cache(new TestObjectCache);
199 // Compile this module with an MCJIT engine
200 createJIT(M.release());
201 TheJIT->setObjectCache(Cache.get());
202 TheJIT->finalizeObject();
204 // Destroy the MCJIT engine we just used
207 // Create a new memory manager.
208 MM = new SectionMemoryManager;
210 // Create a new module and save it. Use a different return code so we can
211 // tell if MCJIT compiled this module or used the cache. Note that we use
212 // a new module name here so the module shouldn't be found in the cache.
213 M.reset(createEmptyModule("<not-main>"));
214 Main = insertMainFunction(M.get(), ReplacementRC);
215 const Module * SecondModulePointer = M.get();
217 // Create a new MCJIT instance to load this module then execute it.
218 createJIT(M.release());
219 TheJIT->setObjectCache(Cache.get());
221 // Verify that our object cache does not contain the module yet.
222 const MemoryBuffer *ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
223 EXPECT_EQ(nullptr, ObjBuffer);
225 // Run the function and look for the replacement return code.
226 compileAndRun(ReplacementRC);
228 // Verify that MCJIT tried to look-up this module in the cache.
229 EXPECT_TRUE(Cache->wasModuleLookedUp(SecondModulePointer));
231 // Verify that our object cache now contains the module.
232 ObjBuffer = Cache->getObjectInternal(SecondModulePointer);
233 EXPECT_TRUE(nullptr != ObjBuffer);
235 // Verify that MCJIT didn't try to cache this again.
236 EXPECT_FALSE(Cache->wereDuplicatesInserted());