1 //===--- TBAATest.cpp - Mixed TBAA unit tests -----------------------------===// 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/Analysis/AliasAnalysisEvaluator.h" 11 #include "llvm/Analysis/Passes.h" 12 #include "llvm/IR/Constants.h" 13 #include "llvm/IR/Instructions.h" 14 #include "llvm/IR/LLVMContext.h" 15 #include "llvm/IR/LegacyPassManager.h" 16 #include "llvm/IR/MDBuilder.h" 17 #include "llvm/IR/Module.h" 18 #include "llvm/IR/Verifier.h" 19 #include "llvm/Support/CommandLine.h" 20 #include "gtest/gtest.h" 21 22 namespace llvm { 23 namespace { 24 25 class TBAATest : public testing::Test { 26 protected: 27 TBAATest() : M("TBAATest", C), MD(C) {} 28 29 LLVMContext C; 30 Module M; 31 MDBuilder MD; 32 }; 33 34 static StoreInst *getFunctionWithSingleStore(Module *M, StringRef Name) { 35 auto &C = M->getContext(); 36 FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), {}); 37 auto *F = cast<Function>(M->getOrInsertFunction(Name, FTy)); 38 auto *BB = BasicBlock::Create(C, "entry", F); 39 auto *IntType = Type::getInt32Ty(C); 40 auto *PtrType = Type::getInt32PtrTy(C); 41 auto *SI = new StoreInst(ConstantInt::get(IntType, 42), 42 ConstantPointerNull::get(PtrType), BB); 43 ReturnInst::Create(C, nullptr, BB); 44 45 return SI; 46 } 47 48 TEST_F(TBAATest, checkVerifierBehaviorForOldTBAA) { 49 auto *SI = getFunctionWithSingleStore(&M, "f1"); 50 auto *F = SI->getFunction(); 51 52 // C++ unit test case to avoid going through the auto upgrade logic. 53 auto *RootMD = MD.createTBAARoot("Simple C/C++ TBAA"); 54 auto *MD1 = MD.createTBAANode("omnipotent char", RootMD); 55 auto *MD2 = MD.createTBAANode("int", MD1); 56 SI->setMetadata(LLVMContext::MD_tbaa, MD2); 57 58 SmallVector<char, 0> ErrorMsg; 59 raw_svector_ostream Outs(ErrorMsg); 60 61 StringRef ExpectedFailureMsg( 62 "Old-style TBAA is no longer allowed, use struct-path TBAA instead"); 63 64 EXPECT_TRUE(verifyFunction(*F, &Outs)); 65 EXPECT_TRUE(StringRef(ErrorMsg.begin(), ErrorMsg.size()) 66 .startswith(ExpectedFailureMsg)); 67 } 68 69 TEST_F(TBAATest, checkTBAAMerging) { 70 auto *SI = getFunctionWithSingleStore(&M, "f2"); 71 auto *F = SI->getFunction(); 72 73 auto *RootMD = MD.createTBAARoot("tbaa-root"); 74 auto *MD1 = MD.createTBAANode("scalar-a", RootMD); 75 auto *StructTag1 = MD.createTBAAStructTagNode(MD1, MD1, 0); 76 auto *MD2 = MD.createTBAANode("scalar-b", RootMD); 77 auto *StructTag2 = MD.createTBAAStructTagNode(MD2, MD2, 0); 78 79 auto *GenericMD = MDNode::getMostGenericTBAA(StructTag1, StructTag2); 80 81 EXPECT_EQ(GenericMD, nullptr); 82 83 // Despite GenericMD being nullptr, we expect the setMetadata call to be well 84 // defined and produce a well-formed function. 85 SI->setMetadata(LLVMContext::MD_tbaa, GenericMD); 86 87 EXPECT_TRUE(!verifyFunction(*F)); 88 } 89 90 } // end anonymous namspace 91 } // end llvm namespace 92
