/*========================== begin_copyright_notice ============================

Copyright (C) 2021 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ===========================*/

#ifndef IGCLLVM_ANALYSIS_ALIASANALYSIS_H
#define IGCLLVM_ANALYSIS_ALIASANALYSIS_H

#include "llvm/Config/llvm-config.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/ADT/Triple.h"
#include "Probe/Assertion.h"

namespace IGCLLVM
{
  template <typename T>
  class AAResultBaseWrapper : public llvm::AAResultBase
#if LLVM_VERSION_MAJOR < 16
    <T>
#endif // LLVM_VERSION_MAJOR
  {
  public:
    // On LLVMs <16 this llvm::Instruction parameter is not used, but since
    // LLVM source code operates on 3 parameters on LLVMs below 16 and on 4 patameters on LLVM >=16
    // (Here: llvm\Analysis\AliasAnalysis.h - "return Result.alias(LocA, LocB, AAQI);")
    //
    // Then this approach allows us to:
    // 1) Pass 4th argument without failing compilation on both LLVMs,
    // 2) On LLVM 14 Instruction* is optional - we cannot make it required since LLVM's code expects it to have just 3 args,
    //    but it is fine since we will be discarding/ignoring it here anyway,
    // 3) On LLVM 16 Instruction* is required and will fail to build without it (desired behaviour),
    // 3) Is easy to refactor in future - just replace this whole macro with "const llvm::Instruction* CtxI" (update callers and their headers too).
    llvm::AliasResult alias(const llvm::MemoryLocation& LocA, const llvm::MemoryLocation& LocB,
                            llvm::AAQueryInfo& AAQI,
                        #if LLVM_VERSION_MAJOR < 16
                            const llvm::Instruction* CtxI = nullptr
                        #else
                            const llvm::Instruction* CtxI
                        #endif
    ) {
#if LLVM_VERSION_MAJOR >= 16
      return llvm::AAResultBase::alias(LocA, LocB, AAQI, CtxI);
#else
      return llvm::AAResultBase<T>::alias(LocA, LocB, AAQI);
#endif
    }

    bool pointsToConstantMemory(const llvm::MemoryLocation& Loc, llvm::AAQueryInfo& AAQI, bool OrLocal) {
#if LLVM_VERSION_MAJOR < 16
      return llvm::AAResultBase<T>::pointsToConstantMemory(Loc, AAQI, OrLocal);
#else
      return isNoModRef(llvm::AAResultBase::getModRefInfoMask(Loc, AAQI, OrLocal));
#endif
    }
  };

#if LLVM_VERSION_MAJOR < 13
  using AliasResultEnum = llvm::AliasResult;
#else
  using AliasResultEnum = llvm::AliasResult::Kind;
#endif

  using SimpleAAQueryInfo =
#if LLVM_VERSION_MAJOR < 14
      llvm::AAQueryInfo;
#else
      llvm::SimpleAAQueryInfo;
#endif

#if LLVM_VERSION_MAJOR >= 16
  inline SimpleAAQueryInfo createSimpleAAQueryInfo(llvm::AAResults& AAResults)
  {
    return SimpleAAQueryInfo(AAResults);
  }
#else
  inline SimpleAAQueryInfo createSimpleAAQueryInfo(llvm::AAResults& AAResults)
  {
    return SimpleAAQueryInfo{};
}
#endif
}

#endif
