unittests/Transforms/Utils/Cloning.cpp

   1 //===- Cloning.cpp - Unit tests for the Cloner ----------------------------===//
   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/Transforms/Utils/Cloning.h"
  11 #include "llvm/ADT/ArrayRef.h"
  12 #include "llvm/ADT/STLExtras.h"
  13 #include "llvm/ADT/SmallPtrSet.h"
  14 #include "llvm/IR/Argument.h"
  15 #include "llvm/IR/Constant.h"
  16 #include "llvm/IR/DIBuilder.h"
  17 #include "llvm/IR/DebugInfo.h"
  18 #include "llvm/IR/Function.h"
  19 #include "llvm/IR/IRBuilder.h"
  20 #include "llvm/IR/InstIterator.h"
  21 #include "llvm/IR/Instructions.h"
  22 #include "llvm/IR/IntrinsicInst.h"
  23 #include "llvm/IR/LLVMContext.h"
  24 #include "llvm/IR/Module.h"
  25 #include "llvm/IR/Verifier.h"
  26 #include "gtest/gtest.h"
  27
  28 using namespace llvm;
  29
  30 namespace {
  31
  32 class CloneInstruction : public ::testing::Test {
  33 protected:
  34   void SetUp() override { V = nullptr; }
  35
  36   template <typename T>
  37   T *clone(T *V1) {
  38     Value *V2 = V1->clone();
  39     Orig.insert(V1);
  40     Clones.insert(V2);
  41     return cast<T>(V2);
  42   }
  43
  44   void eraseClones() {
  45     DeleteContainerPointers(Clones);
  46   }
  47
  48   void TearDown() override {
  49     eraseClones();
  50     DeleteContainerPointers(Orig);
  51     delete V;
  52   }
  53
  54   SmallPtrSet<Value *, 4> Orig;   // Erase on exit
  55   SmallPtrSet<Value *, 4> Clones; // Erase in eraseClones
  56
  57   LLVMContext context;
  58   Value *V;
  59 };
  60
  61 TEST_F(CloneInstruction, OverflowBits) {
  62   V = new Argument(Type::getInt32Ty(context));
  63
  64   BinaryOperator *Add = BinaryOperator::Create(Instruction::Add, V, V);
  65   BinaryOperator *Sub = BinaryOperator::Create(Instruction::Sub, V, V);
  66   BinaryOperator *Mul = BinaryOperator::Create(Instruction::Mul, V, V);
  67
  68   BinaryOperator *AddClone = this->clone(Add);
  69   BinaryOperator *SubClone = this->clone(Sub);
  70   BinaryOperator *MulClone = this->clone(Mul);
  71
  72   EXPECT_FALSE(AddClone->hasNoUnsignedWrap());
  73   EXPECT_FALSE(AddClone->hasNoSignedWrap());
  74   EXPECT_FALSE(SubClone->hasNoUnsignedWrap());
  75   EXPECT_FALSE(SubClone->hasNoSignedWrap());
  76   EXPECT_FALSE(MulClone->hasNoUnsignedWrap());
  77   EXPECT_FALSE(MulClone->hasNoSignedWrap());
  78
  79   eraseClones();
  80
  81   Add->setHasNoUnsignedWrap();
  82   Sub->setHasNoUnsignedWrap();
  83   Mul->setHasNoUnsignedWrap();
  84
  85   AddClone = this->clone(Add);
  86   SubClone = this->clone(Sub);
  87   MulClone = this->clone(Mul);
  88
  89   EXPECT_TRUE(AddClone->hasNoUnsignedWrap());
  90   EXPECT_FALSE(AddClone->hasNoSignedWrap());
  91   EXPECT_TRUE(SubClone->hasNoUnsignedWrap());
  92   EXPECT_FALSE(SubClone->hasNoSignedWrap());
  93   EXPECT_TRUE(MulClone->hasNoUnsignedWrap());
  94   EXPECT_FALSE(MulClone->hasNoSignedWrap());
  95
  96   eraseClones();
  97
  98   Add->setHasNoSignedWrap();
  99   Sub->setHasNoSignedWrap();
 100   Mul->setHasNoSignedWrap();
 101
 102   AddClone = this->clone(Add);
 103   SubClone = this->clone(Sub);
 104   MulClone = this->clone(Mul);
 105
 106   EXPECT_TRUE(AddClone->hasNoUnsignedWrap());
 107   EXPECT_TRUE(AddClone->hasNoSignedWrap());
 108   EXPECT_TRUE(SubClone->hasNoUnsignedWrap());
 109   EXPECT_TRUE(SubClone->hasNoSignedWrap());
 110   EXPECT_TRUE(MulClone->hasNoUnsignedWrap());
 111   EXPECT_TRUE(MulClone->hasNoSignedWrap());
 112
 113   eraseClones();
 114
 115   Add->setHasNoUnsignedWrap(false);
 116   Sub->setHasNoUnsignedWrap(false);
 117   Mul->setHasNoUnsignedWrap(false);
 118
 119   AddClone = this->clone(Add);
 120   SubClone = this->clone(Sub);
 121   MulClone = this->clone(Mul);
 122
 123   EXPECT_FALSE(AddClone->hasNoUnsignedWrap());
 124   EXPECT_TRUE(AddClone->hasNoSignedWrap());
 125   EXPECT_FALSE(SubClone->hasNoUnsignedWrap());
 126   EXPECT_TRUE(SubClone->hasNoSignedWrap());
 127   EXPECT_FALSE(MulClone->hasNoUnsignedWrap());
 128   EXPECT_TRUE(MulClone->hasNoSignedWrap());
 129 }
 130
 131 TEST_F(CloneInstruction, Inbounds) {
 132   V = new Argument(Type::getInt32PtrTy(context));
 133
 134   Constant *Z = Constant::getNullValue(Type::getInt32Ty(context));
 135   std::vector<Value *> ops;
 136   ops.push_back(Z);
 137   GetElementPtrInst *GEP =
 138       GetElementPtrInst::Create(Type::getInt32Ty(context), V, ops);
 139   EXPECT_FALSE(this->clone(GEP)->isInBounds());
 140
 141   GEP->setIsInBounds();
 142   EXPECT_TRUE(this->clone(GEP)->isInBounds());
 143 }
 144
 145 TEST_F(CloneInstruction, Exact) {
 146   V = new Argument(Type::getInt32Ty(context));
 147
 148   BinaryOperator *SDiv = BinaryOperator::Create(Instruction::SDiv, V, V);
 149   EXPECT_FALSE(this->clone(SDiv)->isExact());
 150
 151   SDiv->setIsExact(true);
 152   EXPECT_TRUE(this->clone(SDiv)->isExact());
 153 }
 154
 155 TEST_F(CloneInstruction, Attributes) {
 156   Type *ArgTy1[] = { Type::getInt32PtrTy(context) };
 157   FunctionType *FT1 =  FunctionType::get(Type::getVoidTy(context), ArgTy1, false);
 158
 159   Function *F1 = Function::Create(FT1, Function::ExternalLinkage);
 160   BasicBlock *BB = BasicBlock::Create(context, "", F1);
 161   IRBuilder<> Builder(BB);
 162   Builder.CreateRetVoid();
 163
 164   Function *F2 = Function::Create(FT1, Function::ExternalLinkage);
 165
 166   Attribute::AttrKind AK[] = { Attribute::NoCapture };
 167   AttributeSet AS = AttributeSet::get(context, 0, AK);
 168   Argument *A = F1->arg_begin();
 169   A->addAttr(AS);
 170
 171   SmallVector<ReturnInst*, 4> Returns;
 172   ValueToValueMapTy VMap;
 173   VMap[A] = UndefValue::get(A->getType());
 174
 175   CloneFunctionInto(F2, F1, VMap, false, Returns);
 176   EXPECT_FALSE(F2->arg_begin()->hasNoCaptureAttr());
 177
 178   delete F1;
 179   delete F2;
 180 }
 181
 182 TEST_F(CloneInstruction, CallingConvention) {
 183   Type *ArgTy1[] = { Type::getInt32PtrTy(context) };
 184   FunctionType *FT1 =  FunctionType::get(Type::getVoidTy(context), ArgTy1, false);
 185
 186   Function *F1 = Function::Create(FT1, Function::ExternalLinkage);
 187   F1->setCallingConv(CallingConv::Cold);
 188   BasicBlock *BB = BasicBlock::Create(context, "", F1);
 189   IRBuilder<> Builder(BB);
 190   Builder.CreateRetVoid();
 191
 192   Function *F2 = Function::Create(FT1, Function::ExternalLinkage);
 193
 194   SmallVector<ReturnInst*, 4> Returns;
 195   ValueToValueMapTy VMap;
 196   VMap[F1->arg_begin()] = F2->arg_begin();
 197
 198   CloneFunctionInto(F2, F1, VMap, false, Returns);
 199   EXPECT_EQ(CallingConv::Cold, F2->getCallingConv());
 200
 201   delete F1;
 202   delete F2;
 203 }
 204
 205 class CloneFunc : public ::testing::Test {
 206 protected:
 207   void SetUp() override {
 208     SetupModule();
 209     CreateOldFunc();
 210     CreateNewFunc();
 211     SetupFinder();
 212   }
 213
 214   void TearDown() override { delete Finder; }
 215
 216   void SetupModule() {
 217     M = new Module("", C);
 218   }
 219
 220   void CreateOldFunc() {
 221     FunctionType* FuncType = FunctionType::get(Type::getVoidTy(C), false);
 222     OldFunc = Function::Create(FuncType, GlobalValue::PrivateLinkage, "f", M);
 223     CreateOldFunctionBodyAndDI();
 224   }
 225
 226   void CreateOldFunctionBodyAndDI() {
 227     DIBuilder DBuilder(*M);
 228     IRBuilder<> IBuilder(C);
 229
 230     // Function DI
 231     DIFile File = DBuilder.createFile("filename.c", "/file/dir/");
 232     DITypeArray ParamTypes = DBuilder.getOrCreateTypeArray(None);
 233     MDSubroutineType *FuncType =
 234         DBuilder.createSubroutineType(File, ParamTypes);
 235     DICompileUnit CU = DBuilder.createCompileUnit(dwarf::DW_LANG_C99,
 236         "filename.c", "/file/dir", "CloneFunc", false, "", 0);
 237
 238     DISubprogram Subprogram = DBuilder.createFunction(CU, "f", "f", File, 4,
 239         FuncType, true, true, 3, 0, false, OldFunc);
 240
 241     // Function body
 242     BasicBlock* Entry = BasicBlock::Create(C, "", OldFunc);
 243     IBuilder.SetInsertPoint(Entry);
 244     DebugLoc Loc = DebugLoc::get(3, 2, Subprogram);
 245     IBuilder.SetCurrentDebugLocation(Loc);
 246     AllocaInst* Alloca = IBuilder.CreateAlloca(IntegerType::getInt32Ty(C));
 247     IBuilder.SetCurrentDebugLocation(DebugLoc::get(4, 2, Subprogram));
 248     Value* AllocaContent = IBuilder.getInt32(1);
 249     Instruction* Store = IBuilder.CreateStore(AllocaContent, Alloca);
 250     IBuilder.SetCurrentDebugLocation(DebugLoc::get(5, 2, Subprogram));
 251     Instruction* Terminator = IBuilder.CreateRetVoid();
 252
 253     // Create a local variable around the alloca
 254     auto *IntType =
 255         DBuilder.createBasicType("int", 32, 0, dwarf::DW_ATE_signed);
 256     DIExpression E = DBuilder.createExpression();
 257     DIVariable Variable = DBuilder.createLocalVariable(
 258       dwarf::DW_TAG_auto_variable, Subprogram, "x", File, 5, IntType, true);
 259     auto *DL = MDLocation::get(Subprogram->getContext(), 5, 0, Subprogram);
 260     DBuilder.insertDeclare(Alloca, Variable, E, DL, Store);
 261     DBuilder.insertDbgValueIntrinsic(AllocaContent, 0, Variable, E, DL,
 262                                      Terminator);
 263     // Finalize the debug info
 264     DBuilder.finalize();
 265
 266
 267     // Create another, empty, compile unit
 268     DIBuilder DBuilder2(*M);
 269     DBuilder2.createCompileUnit(dwarf::DW_LANG_C99,
 270         "extra.c", "/file/dir", "CloneFunc", false, "", 0);
 271     DBuilder2.finalize();
 272   }
 273
 274   void CreateNewFunc() {
 275     ValueToValueMapTy VMap;
 276     NewFunc = CloneFunction(OldFunc, VMap, true, nullptr);
 277     M->getFunctionList().push_back(NewFunc);
 278   }
 279
 280   void SetupFinder() {
 281     Finder = new DebugInfoFinder();
 282     Finder->processModule(*M);
 283   }
 284
 285   LLVMContext C;
 286   Function* OldFunc;
 287   Function* NewFunc;
 288   Module* M;
 289   DebugInfoFinder* Finder;
 290 };
 291
 292 // Test that a new, distinct function was created.
 293 TEST_F(CloneFunc, NewFunctionCreated) {
 294   EXPECT_NE(OldFunc, NewFunc);
 295 }
 296
 297 // Test that a new subprogram entry was added and is pointing to the new
 298 // function, while the original subprogram still points to the old one.
 299 TEST_F(CloneFunc, Subprogram) {
 300   EXPECT_FALSE(verifyModule(*M));
 301
 302   unsigned SubprogramCount = Finder->subprogram_count();
 303   EXPECT_EQ(2U, SubprogramCount);
 304
 305   auto Iter = Finder->subprograms().begin();
 306   DISubprogram Sub1 = cast<MDSubprogram>(*Iter);
 307   Iter++;
 308   DISubprogram Sub2 = cast<MDSubprogram>(*Iter);
 309
 310   EXPECT_TRUE(
 311       (Sub1->getFunction() == OldFunc && Sub2->getFunction() == NewFunc) ||
 312       (Sub1->getFunction() == NewFunc && Sub2->getFunction() == OldFunc));
 313 }
 314
 315 // Test that the new subprogram entry was not added to the CU which doesn't
 316 // contain the old subprogram entry.
 317 TEST_F(CloneFunc, SubprogramInRightCU) {
 318   EXPECT_FALSE(verifyModule(*M));
 319
 320   EXPECT_EQ(2U, Finder->compile_unit_count());
 321
 322   auto Iter = Finder->compile_units().begin();
 323   DICompileUnit CU1 = cast<MDCompileUnit>(*Iter);
 324   Iter++;
 325   DICompileUnit CU2 = cast<MDCompileUnit>(*Iter);
 326   EXPECT_TRUE(CU1->getSubprograms().size() == 0 ||
 327               CU2->getSubprograms().size() == 0);
 328 }
 329
 330 // Test that instructions in the old function still belong to it in the
 331 // metadata, while instruction in the new function belong to the new one.
 332 TEST_F(CloneFunc, InstructionOwnership) {
 333   EXPECT_FALSE(verifyModule(*M));
 334
 335   inst_iterator OldIter = inst_begin(OldFunc);
 336   inst_iterator OldEnd = inst_end(OldFunc);
 337   inst_iterator NewIter = inst_begin(NewFunc);
 338   inst_iterator NewEnd = inst_end(NewFunc);
 339   while (OldIter != OldEnd && NewIter != NewEnd) {
 340     Instruction& OldI = *OldIter;
 341     Instruction& NewI = *NewIter;
 342     EXPECT_NE(&OldI, &NewI);
 343
 344     EXPECT_EQ(OldI.hasMetadata(), NewI.hasMetadata());
 345     if (OldI.hasMetadata()) {
 346       const DebugLoc& OldDL = OldI.getDebugLoc();
 347       const DebugLoc& NewDL = NewI.getDebugLoc();
 348
 349       // Verify that the debug location data is the same
 350       EXPECT_EQ(OldDL.getLine(), NewDL.getLine());
 351       EXPECT_EQ(OldDL.getCol(), NewDL.getCol());
 352
 353       // But that they belong to different functions
 354       auto *OldSubprogram = cast<MDSubprogram>(OldDL.getScope());
 355       auto *NewSubprogram = cast<MDSubprogram>(NewDL.getScope());
 356       EXPECT_EQ(OldFunc, OldSubprogram->getFunction());
 357       EXPECT_EQ(NewFunc, NewSubprogram->getFunction());
 358     }
 359
 360     ++OldIter;
 361     ++NewIter;
 362   }
 363   EXPECT_EQ(OldEnd, OldIter);
 364   EXPECT_EQ(NewEnd, NewIter);
 365 }
 366
 367 // Test that the arguments for debug intrinsics in the new function were
 368 // properly cloned
 369 TEST_F(CloneFunc, DebugIntrinsics) {
 370   EXPECT_FALSE(verifyModule(*M));
 371
 372   inst_iterator OldIter = inst_begin(OldFunc);
 373   inst_iterator OldEnd = inst_end(OldFunc);
 374   inst_iterator NewIter = inst_begin(NewFunc);
 375   inst_iterator NewEnd = inst_end(NewFunc);
 376   while (OldIter != OldEnd && NewIter != NewEnd) {
 377     Instruction& OldI = *OldIter;
 378     Instruction& NewI = *NewIter;
 379     if (DbgDeclareInst* OldIntrin = dyn_cast<DbgDeclareInst>(&OldI)) {
 380       DbgDeclareInst* NewIntrin = dyn_cast<DbgDeclareInst>(&NewI);
 381       EXPECT_TRUE(NewIntrin);
 382
 383       // Old address must belong to the old function
 384       EXPECT_EQ(OldFunc, cast<AllocaInst>(OldIntrin->getAddress())->
 385                          getParent()->getParent());
 386       // New address must belong to the new function
 387       EXPECT_EQ(NewFunc, cast<AllocaInst>(NewIntrin->getAddress())->
 388                          getParent()->getParent());
 389
 390       // Old variable must belong to the old function
 391       EXPECT_EQ(OldFunc,
 392                 cast<MDSubprogram>(OldIntrin->getVariable()->getScope())
 393                     ->getFunction());
 394       // New variable must belong to the New function
 395       EXPECT_EQ(NewFunc,
 396                 cast<MDSubprogram>(NewIntrin->getVariable()->getScope())
 397                     ->getFunction());
 398     } else if (DbgValueInst* OldIntrin = dyn_cast<DbgValueInst>(&OldI)) {
 399       DbgValueInst* NewIntrin = dyn_cast<DbgValueInst>(&NewI);
 400       EXPECT_TRUE(NewIntrin);
 401
 402       // Old variable must belong to the old function
 403       EXPECT_EQ(OldFunc,
 404                 cast<MDSubprogram>(OldIntrin->getVariable()->getScope())
 405                     ->getFunction());
 406       // New variable must belong to the New function
 407       EXPECT_EQ(NewFunc,
 408                 cast<MDSubprogram>(NewIntrin->getVariable()->getScope())
 409                     ->getFunction());
 410     }
 411
 412     ++OldIter;
 413     ++NewIter;
 414   }
 415 }
 416
 417 }