src/llvm/unittests/Analysis/MixedTBAATest.cpp

   1 //===--- MixedTBAATest.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/Passes.h"
  11 #include "llvm/IR/Constants.h"
  12 #include "llvm/IR/Instructions.h"
  13 #include "llvm/IR/LLVMContext.h"
  14 #include "llvm/IR/MDBuilder.h"
  15 #include "llvm/IR/Module.h"
  16 #include "llvm/PassManager.h"
  17 #include "llvm/Support/CommandLine.h"
  18 #include "gtest/gtest.h"
  19
  20 namespace llvm {
  21 namespace {
  22
  23 class MixedTBAATest : public testing::Test {
  24 protected:
  25   MixedTBAATest() : M("MixedTBAATest", C), MD(C) {}
  26
  27   LLVMContext C;
  28   Module M;
  29   MDBuilder MD;
  30   PassManager PM;
  31 };
  32
  33 TEST_F(MixedTBAATest, MixedTBAA) {
  34   // Setup function.
  35   FunctionType *FTy = FunctionType::get(Type::getVoidTy(C),
  36                                         std::vector<Type *>(), false);
  37   auto *F = cast<Function>(M.getOrInsertFunction("f", FTy));
  38   auto *BB = BasicBlock::Create(C, "entry", F);
  39   auto IntType = Type::getInt32Ty(C);
  40   auto PtrType = Type::getInt32PtrTy(C);
  41   auto *Value  = ConstantInt::get(IntType, 42);
  42   auto *Addr = ConstantPointerNull::get(PtrType);
  43
  44   auto *Store1 = new StoreInst(Value, Addr, BB);
  45   auto *Store2 = new StoreInst(Value, Addr, BB);
  46   ReturnInst::Create(C, nullptr, BB);
  47
  48   // New TBAA metadata
  49   {
  50     auto RootMD = MD.createTBAARoot("Simple C/C++ TBAA");
  51     auto MD1 = MD.createTBAAScalarTypeNode("omnipotent char", RootMD);
  52     auto MD2 = MD.createTBAAScalarTypeNode("int", MD1);
  53     auto MD3 = MD.createTBAAStructTagNode(MD2, MD2, 0);
  54     Store2->setMetadata(LLVMContext::MD_tbaa, MD3);
  55   }
  56
  57   // Old TBAA metadata
  58   {
  59     auto RootMD = MD.createTBAARoot("Simple C/C++ TBAA");
  60     auto MD1 = MD.createTBAANode("omnipotent char", RootMD);
  61     auto MD2 = MD.createTBAANode("int", MD1);
  62     Store1->setMetadata(LLVMContext::MD_tbaa, MD2);
  63   }
  64
  65   // Run the TBAA eval pass on a mixture of path-aware and non-path-aware TBAA.
  66   // The order of the metadata (path-aware vs non-path-aware) is important,
  67   // because the AA eval pass only runs one test per store-pair.
  68   const char* args[] = { "MixedTBAATest", "-evaluate-aa-metadata" };
  69   cl::ParseCommandLineOptions(sizeof(args) / sizeof(const char*), args);
  70   PM.add(createTypeBasedAliasAnalysisPass());
  71   PM.add(createAAEvalPass());
  72   PM.run(M);
  73 }
  74
  75 } // end anonymous namspace
  76 } // end llvm namespace
  77