unittests/Transforms/Utils/ValueMapperTest.cpp

//===- ValueMapper.cpp - Unit tests for ValueMapper -----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/Transforms/Utils/ValueMapper.h"
#include "gtest/gtest.h"

using namespace llvm;

namespace {

TEST(ValueMapperTest, MapMetadataUnresolved) {
  LLVMContext Context;
  TempMDTuple T = MDTuple::getTemporary(Context, None);

  ValueToValueMapTy VM;
  EXPECT_EQ(T.get(), MapMetadata(T.get(), VM, RF_NoModuleLevelChanges));
}

TEST(ValueMapperTest, MapMetadataDistinct) {
  LLVMContext Context;
  auto *D = MDTuple::getDistinct(Context, None);

  {
    // The node should be cloned.
    ValueToValueMapTy VM;
    EXPECT_NE(D, MapMetadata(D, VM, RF_None));
  }
  {
    // The node should be moved.
    ValueToValueMapTy VM;
    EXPECT_EQ(D, MapMetadata(D, VM, RF_MoveDistinctMDs));
  }
}

TEST(ValueMapperTest, MapMetadataDistinctOperands) {
  LLVMContext Context;
  Metadata *Old = MDTuple::getDistinct(Context, None);
  auto *D = MDTuple::getDistinct(Context, Old);
  ASSERT_EQ(Old, D->getOperand(0));

  Metadata *New = MDTuple::getDistinct(Context, None);
  ValueToValueMapTy VM;
  VM.MD()[Old].reset(New);

  // Make sure operands are updated.
  EXPECT_EQ(D, MapMetadata(D, VM, RF_MoveDistinctMDs));
  EXPECT_EQ(New, D->getOperand(0));
}

TEST(ValueMapperTest, MapMetadataSeeded) {
  LLVMContext Context;
  auto *D = MDTuple::getDistinct(Context, None);

  // The node should be moved.
  ValueToValueMapTy VM;
  EXPECT_EQ(None, VM.getMappedMD(D));

  VM.MD().insert(std::make_pair(D, TrackingMDRef(D)));
  EXPECT_EQ(D, *VM.getMappedMD(D));
  EXPECT_EQ(D, MapMetadata(D, VM, RF_None));
}

TEST(ValueMapperTest, MapMetadataSeededWithNull) {
  LLVMContext Context;
  auto *D = MDTuple::getDistinct(Context, None);

  // The node should be moved.
  ValueToValueMapTy VM;
  EXPECT_EQ(None, VM.getMappedMD(D));

  VM.MD().insert(std::make_pair(D, TrackingMDRef()));
  EXPECT_EQ(nullptr, *VM.getMappedMD(D));
  EXPECT_EQ(nullptr, MapMetadata(D, VM, RF_None));
}

} // end namespace