llvm-mirror/unittests/VMCore/VerifierTest.cpp

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

#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/LLVMContext.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/Analysis/Verifier.h"
#include "gtest/gtest.h"

namespace llvm {
namespace {

TEST(VerifierTest, Branch_i1) {
  LLVMContext &C = getGlobalContext();
  FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), /*isVarArg=*/false);
  OwningPtr<Function> F(Function::Create(FTy, GlobalValue::ExternalLinkage));
  BasicBlock *Entry = BasicBlock::Create(C, "entry", F.get());
  BasicBlock *Exit = BasicBlock::Create(C, "exit", F.get());
  ReturnInst::Create(C, Exit);

  // To avoid triggering an assertion in BranchInst::Create, we first create
  // a branch with an 'i1' condition ...

  Constant *False = ConstantInt::getFalse(C);
  BranchInst *BI = BranchInst::Create(Exit, Exit, False, Entry);

  // ... then use setOperand to redirect it to a value of different type.

  Constant *Zero32 = ConstantInt::get(IntegerType::get(C, 32), 0);
  BI->setOperand(0, Zero32);

  EXPECT_TRUE(verifyFunction(*F, ReturnStatusAction));
}

}
}