llvm/unittests/IR/AsmWriterTest.cpp

//===- llvm/unittest/IR/AsmWriter.cpp - AsmWriter tests -------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "gtest/gtest.h"

using namespace llvm;

namespace {

TEST(AsmWriterTest, DebugPrintDetachedInstruction) {

  // PR24852: Ensure that an instruction can be printed even when it
  // has metadata attached but no parent.
  LLVMContext Ctx;
  auto Ty = Type::getInt32Ty(Ctx);
  auto Undef = UndefValue::get(Ty);
  std::unique_ptr<BinaryOperator> Add(BinaryOperator::CreateAdd(Undef, Undef));
  Add->setMetadata(
      "", MDNode::get(Ctx, {ConstantAsMetadata::get(ConstantInt::get(Ty, 1))}));
  std::string S;
  raw_string_ostream OS(S);
  Add->print(OS);
  std::size_t r = OS.str().find("<badref> = add i32 undef, undef, !<empty");
  EXPECT_TRUE(r != std::string::npos);
}

}