unittests/IR/AsmWriterTest.cpp

   1 //===- llvm/unittest/IR/AsmWriter.cpp - AsmWriter 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 #include "llvm/IR/IRBuilder.h"
  10 #include "llvm/IR/Function.h"
  11 #include "llvm/IR/LLVMContext.h"
  12 #include "llvm/IR/MDBuilder.h"
  13 #include "llvm/IR/Module.h"
  14 #include "gtest/gtest.h"
  15
  16 using namespace llvm;
  17
  18 namespace {
  19
  20 TEST(AsmWriterTest, DebugPrintDetachedInstruction) {
  21
  22   // PR24852: Ensure that an instruction can be printed even when it
  23   // has metadata attached but no parent.
  24   LLVMContext Ctx;
  25   auto Ty = Type::getInt32Ty(Ctx);
  26   auto Undef = UndefValue::get(Ty);
  27   std::unique_ptr<BinaryOperator> Add(BinaryOperator::CreateAdd(Undef, Undef));
  28   Add->setMetadata(
  29       "", MDNode::get(Ctx, {ConstantAsMetadata::get(ConstantInt::get(Ty, 1))}));
  30   std::string S;
  31   raw_string_ostream OS(S);
  32   Add->print(OS);
  33   std::size_t r = OS.str().find("<badref> = add i32 undef, undef, !<empty");
  34   EXPECT_TRUE(r != std::string::npos);
  35 }
  36
  37 }