llvm/unittests/VMCore/IRBuilderTest.cpp

//===- llvm/unittest/VMCore/IRBuilderTest.cpp - IRBuilder tests -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
#include "llvm/IRBuilder.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/LLVMContext.h"
#include "llvm/MDBuilder.h"
#include "llvm/Module.h"
#include "llvm/ADT/OwningPtr.h"

#include "gtest/gtest.h"

using namespace llvm;

namespace {

class IRBuilderTest : public testing::Test {
protected:
  virtual void SetUp() {
    M.reset(new Module("MyModule", getGlobalContext()));
    FunctionType *FTy = FunctionType::get(Type::getVoidTy(getGlobalContext()),
                                          /*isVarArg=*/false);
    F = Function::Create(FTy, Function::ExternalLinkage, "", M.get());
    BB = BasicBlock::Create(getGlobalContext(), "", F);
  }

  virtual void TearDown() {
    BB = 0;
    M.reset();
  }

  OwningPtr<Module> M;
  Function *F;
  BasicBlock *BB;
};

TEST_F(IRBuilderTest, Lifetime) {
  IRBuilder<> Builder(BB);
  AllocaInst *Var1 = Builder.CreateAlloca(Builder.getInt8Ty());
  AllocaInst *Var2 = Builder.CreateAlloca(Builder.getInt32Ty());
  AllocaInst *Var3 = Builder.CreateAlloca(Builder.getInt8Ty(),
                                          Builder.getInt32(123));

  CallInst *Start1 = Builder.CreateLifetimeStart(Var1);
  CallInst *Start2 = Builder.CreateLifetimeStart(Var2);
  CallInst *Start3 = Builder.CreateLifetimeStart(Var3, Builder.getInt64(100));

  EXPECT_EQ(Start1->getArgOperand(0), Builder.getInt64(-1));
  EXPECT_EQ(Start2->getArgOperand(0), Builder.getInt64(-1));
  EXPECT_EQ(Start3->getArgOperand(0), Builder.getInt64(100));

  EXPECT_EQ(Start1->getArgOperand(1), Var1);
  EXPECT_NE(Start2->getArgOperand(1), Var2);
  EXPECT_EQ(Start3->getArgOperand(1), Var3);

  Value *End1 = Builder.CreateLifetimeEnd(Var1);
  Builder.CreateLifetimeEnd(Var2);
  Builder.CreateLifetimeEnd(Var3);

  IntrinsicInst *II_Start1 = dyn_cast<IntrinsicInst>(Start1);
  IntrinsicInst *II_End1 = dyn_cast<IntrinsicInst>(End1);
  ASSERT_TRUE(II_Start1 != NULL);
  EXPECT_EQ(II_Start1->getIntrinsicID(), Intrinsic::lifetime_start);
  ASSERT_TRUE(II_End1 != NULL);
  EXPECT_EQ(II_End1->getIntrinsicID(), Intrinsic::lifetime_end);
}

TEST_F(IRBuilderTest, CreateCondBr) {
  IRBuilder<> Builder(BB);
  BasicBlock *TBB = BasicBlock::Create(getGlobalContext(), "", F);
  BasicBlock *FBB = BasicBlock::Create(getGlobalContext(), "", F);

  BranchInst *BI = Builder.CreateCondBr(Builder.getTrue(), TBB, FBB);
  TerminatorInst *TI = BB->getTerminator();
  EXPECT_EQ(BI, TI);
  EXPECT_EQ(2u, TI->getNumSuccessors());
  EXPECT_EQ(TBB, TI->getSuccessor(0));
  EXPECT_EQ(FBB, TI->getSuccessor(1));

  BI->eraseFromParent();
  MDNode *Weights = MDBuilder(getGlobalContext()).createBranchWeights(42, 13);
  BI = Builder.CreateCondBr(Builder.getTrue(), TBB, FBB, Weights);
  TI = BB->getTerminator();
  EXPECT_EQ(BI, TI);
  EXPECT_EQ(2u, TI->getNumSuccessors());
  EXPECT_EQ(TBB, TI->getSuccessor(0));
  EXPECT_EQ(FBB, TI->getSuccessor(1));
  EXPECT_EQ(Weights, TI->getMetadata(LLVMContext::MD_prof));
}

}