1 //===- JITMemoryManagerTest.cpp - Unit tests for the JIT memory manager ---===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/ExecutionEngine/JITMemoryManager.h" 11 #include "llvm/ADT/ArrayRef.h" 12 #include "llvm/ADT/OwningPtr.h" 13 #include "llvm/IR/DerivedTypes.h" 14 #include "llvm/IR/Function.h" 15 #include "llvm/IR/GlobalValue.h" 16 #include "llvm/IR/LLVMContext.h" 17 #include "gtest/gtest.h" 18 19 using namespace llvm; 20 21 namespace { 22 23 Function *makeFakeFunction() { 24 std::vector<Type*> params; 25 FunctionType *FTy = 26 FunctionType::get(Type::getVoidTy(getGlobalContext()), params, false); 27 return Function::Create(FTy, GlobalValue::ExternalLinkage); 28 } 29 30 // Allocate three simple functions that fit in the initial slab. This exercises 31 // the code in the case that we don't have to allocate more memory to store the 32 // function bodies. 33 TEST(JITMemoryManagerTest, NoAllocations) { 34 OwningPtr<JITMemoryManager> MemMgr( 35 JITMemoryManager::CreateDefaultMemManager()); 36 uintptr_t size; 37 std::string Error; 38 39 // Allocate the functions. 40 OwningPtr<Function> F1(makeFakeFunction()); 41 size = 1024; 42 uint8_t *FunctionBody1 = MemMgr->startFunctionBody(F1.get(), size); 43 memset(FunctionBody1, 0xFF, 1024); 44 MemMgr->endFunctionBody(F1.get(), FunctionBody1, FunctionBody1 + 1024); 45 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 46 47 OwningPtr<Function> F2(makeFakeFunction()); 48 size = 1024; 49 uint8_t *FunctionBody2 = MemMgr->startFunctionBody(F2.get(), size); 50 memset(FunctionBody2, 0xFF, 1024); 51 MemMgr->endFunctionBody(F2.get(), FunctionBody2, FunctionBody2 + 1024); 52 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 53 54 OwningPtr<Function> F3(makeFakeFunction()); 55 size = 1024; 56 uint8_t *FunctionBody3 = MemMgr->startFunctionBody(F3.get(), size); 57 memset(FunctionBody3, 0xFF, 1024); 58 MemMgr->endFunctionBody(F3.get(), FunctionBody3, FunctionBody3 + 1024); 59 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 60 61 // Deallocate them out of order, in case that matters. 62 MemMgr->deallocateFunctionBody(FunctionBody2); 63 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 64 MemMgr->deallocateFunctionBody(FunctionBody1); 65 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 66 MemMgr->deallocateFunctionBody(FunctionBody3); 67 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 68 } 69 70 // Make three large functions that take up most of the space in the slab. Then 71 // try allocating three smaller functions that don't require additional slabs. 72 TEST(JITMemoryManagerTest, TestCodeAllocation) { 73 OwningPtr<JITMemoryManager> MemMgr( 74 JITMemoryManager::CreateDefaultMemManager()); 75 uintptr_t size; 76 std::string Error; 77 78 // Big functions are a little less than the largest block size. 79 const uintptr_t smallFuncSize = 1024; 80 const uintptr_t bigFuncSize = (MemMgr->GetDefaultCodeSlabSize() - 81 smallFuncSize * 2); 82 83 // Allocate big functions 84 OwningPtr<Function> F1(makeFakeFunction()); 85 size = bigFuncSize; 86 uint8_t *FunctionBody1 = MemMgr->startFunctionBody(F1.get(), size); 87 ASSERT_LE(bigFuncSize, size); 88 memset(FunctionBody1, 0xFF, bigFuncSize); 89 MemMgr->endFunctionBody(F1.get(), FunctionBody1, FunctionBody1 + bigFuncSize); 90 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 91 92 OwningPtr<Function> F2(makeFakeFunction()); 93 size = bigFuncSize; 94 uint8_t *FunctionBody2 = MemMgr->startFunctionBody(F2.get(), size); 95 ASSERT_LE(bigFuncSize, size); 96 memset(FunctionBody2, 0xFF, bigFuncSize); 97 MemMgr->endFunctionBody(F2.get(), FunctionBody2, FunctionBody2 + bigFuncSize); 98 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 99 100 OwningPtr<Function> F3(makeFakeFunction()); 101 size = bigFuncSize; 102 uint8_t *FunctionBody3 = MemMgr->startFunctionBody(F3.get(), size); 103 ASSERT_LE(bigFuncSize, size); 104 memset(FunctionBody3, 0xFF, bigFuncSize); 105 MemMgr->endFunctionBody(F3.get(), FunctionBody3, FunctionBody3 + bigFuncSize); 106 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 107 108 // Check that each large function took it's own slab. 109 EXPECT_EQ(3U, MemMgr->GetNumCodeSlabs()); 110 111 // Allocate small functions 112 OwningPtr<Function> F4(makeFakeFunction()); 113 size = smallFuncSize; 114 uint8_t *FunctionBody4 = MemMgr->startFunctionBody(F4.get(), size); 115 ASSERT_LE(smallFuncSize, size); 116 memset(FunctionBody4, 0xFF, smallFuncSize); 117 MemMgr->endFunctionBody(F4.get(), FunctionBody4, 118 FunctionBody4 + smallFuncSize); 119 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 120 121 OwningPtr<Function> F5(makeFakeFunction()); 122 size = smallFuncSize; 123 uint8_t *FunctionBody5 = MemMgr->startFunctionBody(F5.get(), size); 124 ASSERT_LE(smallFuncSize, size); 125 memset(FunctionBody5, 0xFF, smallFuncSize); 126 MemMgr->endFunctionBody(F5.get(), FunctionBody5, 127 FunctionBody5 + smallFuncSize); 128 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 129 130 OwningPtr<Function> F6(makeFakeFunction()); 131 size = smallFuncSize; 132 uint8_t *FunctionBody6 = MemMgr->startFunctionBody(F6.get(), size); 133 ASSERT_LE(smallFuncSize, size); 134 memset(FunctionBody6, 0xFF, smallFuncSize); 135 MemMgr->endFunctionBody(F6.get(), FunctionBody6, 136 FunctionBody6 + smallFuncSize); 137 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 138 139 // Check that the small functions didn't allocate any new slabs. 140 EXPECT_EQ(3U, MemMgr->GetNumCodeSlabs()); 141 142 // Deallocate them out of order, in case that matters. 143 MemMgr->deallocateFunctionBody(FunctionBody2); 144 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 145 MemMgr->deallocateFunctionBody(FunctionBody1); 146 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 147 MemMgr->deallocateFunctionBody(FunctionBody4); 148 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 149 MemMgr->deallocateFunctionBody(FunctionBody3); 150 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 151 MemMgr->deallocateFunctionBody(FunctionBody5); 152 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 153 MemMgr->deallocateFunctionBody(FunctionBody6); 154 EXPECT_TRUE(MemMgr->CheckInvariants(Error)) << Error; 155 } 156 157 // Allocate five global ints of varying widths and alignment, and check their 158 // alignment and overlap. 159 TEST(JITMemoryManagerTest, TestSmallGlobalInts) { 160 OwningPtr<JITMemoryManager> MemMgr( 161 JITMemoryManager::CreateDefaultMemManager()); 162 uint8_t *a = (uint8_t *)MemMgr->allocateGlobal(8, 0); 163 uint16_t *b = (uint16_t*)MemMgr->allocateGlobal(16, 2); 164 uint32_t *c = (uint32_t*)MemMgr->allocateGlobal(32, 4); 165 uint64_t *d = (uint64_t*)MemMgr->allocateGlobal(64, 8); 166 167 // Check the alignment. 168 EXPECT_EQ(0U, ((uintptr_t)b) & 0x1); 169 EXPECT_EQ(0U, ((uintptr_t)c) & 0x3); 170 EXPECT_EQ(0U, ((uintptr_t)d) & 0x7); 171 172 // Initialize them each one at a time and make sure they don't overlap. 173 *a = 0xff; 174 *b = 0U; 175 *c = 0U; 176 *d = 0U; 177 EXPECT_EQ(0xffU, *a); 178 EXPECT_EQ(0U, *b); 179 EXPECT_EQ(0U, *c); 180 EXPECT_EQ(0U, *d); 181 *a = 0U; 182 *b = 0xffffU; 183 EXPECT_EQ(0U, *a); 184 EXPECT_EQ(0xffffU, *b); 185 EXPECT_EQ(0U, *c); 186 EXPECT_EQ(0U, *d); 187 *b = 0U; 188 *c = 0xffffffffU; 189 EXPECT_EQ(0U, *a); 190 EXPECT_EQ(0U, *b); 191 EXPECT_EQ(0xffffffffU, *c); 192 EXPECT_EQ(0U, *d); 193 *c = 0U; 194 *d = 0xffffffffffffffffULL; 195 EXPECT_EQ(0U, *a); 196 EXPECT_EQ(0U, *b); 197 EXPECT_EQ(0U, *c); 198 EXPECT_EQ(0xffffffffffffffffULL, *d); 199 200 // Make sure we didn't allocate any extra slabs for this tiny amount of data. 201 EXPECT_EQ(1U, MemMgr->GetNumDataSlabs()); 202 } 203 204 // Allocate a small global, a big global, and a third global, and make sure we 205 // only use two slabs for that. 206 TEST(JITMemoryManagerTest, TestLargeGlobalArray) { 207 OwningPtr<JITMemoryManager> MemMgr( 208 JITMemoryManager::CreateDefaultMemManager()); 209 size_t Size = 4 * MemMgr->GetDefaultDataSlabSize(); 210 uint64_t *a = (uint64_t*)MemMgr->allocateGlobal(64, 8); 211 uint8_t *g = MemMgr->allocateGlobal(Size, 8); 212 uint64_t *b = (uint64_t*)MemMgr->allocateGlobal(64, 8); 213 214 // Check the alignment. 215 EXPECT_EQ(0U, ((uintptr_t)a) & 0x7); 216 EXPECT_EQ(0U, ((uintptr_t)g) & 0x7); 217 EXPECT_EQ(0U, ((uintptr_t)b) & 0x7); 218 219 // Initialize them to make sure we don't segfault and make sure they don't 220 // overlap. 221 memset(a, 0x1, 8); 222 memset(g, 0x2, Size); 223 memset(b, 0x3, 8); 224 EXPECT_EQ(0x0101010101010101ULL, *a); 225 // Just check the edges. 226 EXPECT_EQ(0x02U, g[0]); 227 EXPECT_EQ(0x02U, g[Size - 1]); 228 EXPECT_EQ(0x0303030303030303ULL, *b); 229 230 // Check the number of slabs. 231 EXPECT_EQ(2U, MemMgr->GetNumDataSlabs()); 232 } 233 234 // Allocate lots of medium globals so that we can test moving the bump allocator 235 // to a new slab. 236 TEST(JITMemoryManagerTest, TestManyGlobals) { 237 OwningPtr<JITMemoryManager> MemMgr( 238 JITMemoryManager::CreateDefaultMemManager()); 239 size_t SlabSize = MemMgr->GetDefaultDataSlabSize(); 240 size_t Size = 128; 241 int Iters = (SlabSize / Size) + 1; 242 243 // We should start with no slabs. 244 EXPECT_EQ(0U, MemMgr->GetNumDataSlabs()); 245 246 // After allocating a bunch of globals, we should have two. 247 for (int I = 0; I < Iters; ++I) 248 MemMgr->allocateGlobal(Size, 8); 249 EXPECT_EQ(2U, MemMgr->GetNumDataSlabs()); 250 251 // And after much more, we should have three. 252 for (int I = 0; I < Iters; ++I) 253 MemMgr->allocateGlobal(Size, 8); 254 EXPECT_EQ(3U, MemMgr->GetNumDataSlabs()); 255 } 256 257 // Allocate lots of function stubs so that we can test moving the stub bump 258 // allocator to a new slab. 259 TEST(JITMemoryManagerTest, TestManyStubs) { 260 OwningPtr<JITMemoryManager> MemMgr( 261 JITMemoryManager::CreateDefaultMemManager()); 262 size_t SlabSize = MemMgr->GetDefaultStubSlabSize(); 263 size_t Size = 128; 264 int Iters = (SlabSize / Size) + 1; 265 266 // We should start with no slabs. 267 EXPECT_EQ(0U, MemMgr->GetNumDataSlabs()); 268 269 // After allocating a bunch of stubs, we should have two. 270 for (int I = 0; I < Iters; ++I) 271 MemMgr->allocateStub(NULL, Size, 8); 272 EXPECT_EQ(2U, MemMgr->GetNumStubSlabs()); 273 274 // And after much more, we should have three. 275 for (int I = 0; I < Iters; ++I) 276 MemMgr->allocateStub(NULL, Size, 8); 277 EXPECT_EQ(3U, MemMgr->GetNumStubSlabs()); 278 } 279 280 } 281
