//===- LLVMSPIRVOpts.h - Specify options for translation --------*- C++ -*-===//
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//===----------------------------------------------------------------------===//
/// \file LLVMSPIRVOpts.h
///
/// This files declares helper classes to handle SPIR-V versions and extensions.
///
//===----------------------------------------------------------------------===//
#ifndef SPIRV_LLVMSPIRVOPTS_H
#define SPIRV_LLVMSPIRVOPTS_H

#include <llvm/ADT/SmallVector.h>
#include <llvm/ADT/StringRef.h>

#include <cassert>
#include <cstdint>
#include <map>
#include <optional>
#include <unordered_map>

namespace llvm {
class IntrinsicInst;
} // namespace llvm

namespace SPIRV {

/// SPIR-V versions known to translator.
enum class VersionNumber : uint32_t {
  // See section 2.3 of SPIR-V spec: Physical Layout of a SPIR_V Module and
  // Instruction
  SPIRV_1_0 = 0x00010000,
  SPIRV_1_1 = 0x00010100,
  SPIRV_1_2 = 0x00010200,
  SPIRV_1_3 = 0x00010300,
  SPIRV_1_4 = 0x00010400,
  SPIRV_1_5 = 0x00010500,
  MinimumVersion = SPIRV_1_0,
  MaximumVersion = SPIRV_1_5
};

inline constexpr std::string_view formatVersionNumber(uint32_t Version) {
  switch (Version) {
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_0):
    return "1.0";
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_1):
    return "1.1";
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_2):
    return "1.2";
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_3):
    return "1.3";
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_4):
    return "1.4";
  case static_cast<uint32_t>(VersionNumber::SPIRV_1_5):
    return "1.5";
  }
  return "unknown";
}

inline bool isSPIRVVersionKnown(uint32_t Ver) {
  return Ver >= static_cast<uint32_t>(VersionNumber::MinimumVersion) &&
         Ver <= static_cast<uint32_t>(VersionNumber::MaximumVersion);
}

enum class ExtensionID : uint32_t {
  First,
#define EXT(X) X,
#include "LLVMSPIRVExtensions.inc"
#undef EXT
  Last,
};

enum class BIsRepresentation : uint32_t { OpenCL12, OpenCL20, SPIRVFriendlyIR };

enum class FPContractMode : uint32_t { On, Off, Fast };

enum class DebugInfoEIS : uint32_t {
  SPIRV_Debug,
  OpenCL_DebugInfo_100,
  NonSemantic_Shader_DebugInfo_100,
  NonSemantic_Shader_DebugInfo_200
};

enum class BuiltinFormat : uint32_t { Function, Global };

/// \brief Helper class to manage SPIR-V translation
class TranslatorOpts {
public:
  // Unset optional means not directly specified by user
  using ExtensionsStatusMap = std::map<ExtensionID, std::optional<bool>>;

  using ArgList = llvm::SmallVector<llvm::StringRef, 4>;

  TranslatorOpts() = default;

  TranslatorOpts(VersionNumber Max, const ExtensionsStatusMap &Map = {})
      : MaxVersion(Max), ExtStatusMap(Map) {}

  bool isAllowedToUseVersion(VersionNumber RequestedVersion) const {
    return RequestedVersion <= MaxVersion;
  }

  bool isAllowedToUseExtension(ExtensionID Extension) const {
    auto I = ExtStatusMap.find(Extension);
    if (ExtStatusMap.end() == I)
      return false;

    return I->second && *I->second;
  }

  void setAllowedToUseExtension(ExtensionID Extension, bool Allow = true) {
    // Only allow using the extension if it has not already been disabled
    auto I = ExtStatusMap.find(Extension);
    if (I == ExtStatusMap.end() || !I->second || (*I->second) == true)
      ExtStatusMap[Extension] = Allow;
  }

  VersionNumber getMaxVersion() const { return MaxVersion; }

  bool isGenArgNameMDEnabled() const { return GenKernelArgNameMD; }

  bool isSPIRVMemToRegEnabled() const { return SPIRVMemToReg; }

  void setMemToRegEnabled(bool Mem2Reg) { SPIRVMemToReg = Mem2Reg; }

  bool preserveAuxData() const { return PreserveAuxData; }

  void setPreserveAuxData(bool ArgValue) { PreserveAuxData = ArgValue; }

  void setGenKernelArgNameMDEnabled(bool ArgNameMD) {
    GenKernelArgNameMD = ArgNameMD;
  }

  void enableAllExtensions() {
#define EXT(X) ExtStatusMap[ExtensionID::X] = true;
#include "LLVMSPIRVExtensions.inc"
#undef EXT
  }

  void enableGenArgNameMD() { GenKernelArgNameMD = true; }

  void setSpecConst(uint32_t SpecId, uint64_t SpecValue) {
    ExternalSpecialization[SpecId] = SpecValue;
  }

  bool getSpecializationConstant(uint32_t SpecId, uint64_t &Value) const {
    auto It = ExternalSpecialization.find(SpecId);
    if (It == ExternalSpecialization.end())
      return false;
    Value = It->second;
    return true;
  }

  void setDesiredBIsRepresentation(BIsRepresentation Value) {
    DesiredRepresentationOfBIs = Value;
  }

  BIsRepresentation getDesiredBIsRepresentation() const {
    return DesiredRepresentationOfBIs;
  }

  void setFPContractMode(FPContractMode Mode) { FPCMode = Mode; }

  FPContractMode getFPContractMode() const { return FPCMode; }

  bool isUnknownIntrinsicAllowed(llvm::IntrinsicInst *II) const noexcept;
  bool isSPIRVAllowUnknownIntrinsicsEnabled() const noexcept;
  void setSPIRVAllowUnknownIntrinsics(ArgList IntrinsicPrefixList) noexcept;

  bool allowExtraDIExpressions() const noexcept {
    return AllowExtraDIExpressions;
  }

  void setAllowExtraDIExpressionsEnabled(bool Allow) noexcept {
    AllowExtraDIExpressions = Allow;
  }

  DebugInfoEIS getDebugInfoEIS() const { return DebugInfoVersion; }

  void setDebugInfoEIS(DebugInfoEIS EIS) { DebugInfoVersion = EIS; }

  bool shouldReplaceLLVMFmulAddWithOpenCLMad() const noexcept {
    return ReplaceLLVMFmulAddWithOpenCLMad;
  }

  void setReplaceLLVMFmulAddWithOpenCLMad(bool Value) noexcept {
    ReplaceLLVMFmulAddWithOpenCLMad = Value;
  }

  bool shouldPreserveOCLKernelArgTypeMetadataThroughString() const noexcept {
    return PreserveOCLKernelArgTypeMetadataThroughString;
  }

  void setPreserveOCLKernelArgTypeMetadataThroughString(bool Value) noexcept {
    PreserveOCLKernelArgTypeMetadataThroughString = Value;
  }

  void setBuiltinFormat(BuiltinFormat Value) noexcept {
    SPIRVBuiltinFormat = Value;
  }
  BuiltinFormat getBuiltinFormat() const noexcept { return SPIRVBuiltinFormat; }

private:
  // Common translation options
  VersionNumber MaxVersion = VersionNumber::MaximumVersion;
  ExtensionsStatusMap ExtStatusMap;
  // SPIRVMemToReg option affects LLVM IR regularization phase
  bool SPIRVMemToReg = false;
  // SPIR-V to LLVM translation options
  bool GenKernelArgNameMD = false;
  std::unordered_map<uint32_t, uint64_t> ExternalSpecialization;
  // Representation of built-ins, which should be used while translating from
  // SPIR-V to back to LLVM IR
  BIsRepresentation DesiredRepresentationOfBIs = BIsRepresentation::OpenCL12;
  // Controls floating point contraction.
  //
  // - FPContractMode::On allows to choose a mode according to
  //   presence of fused LLVM intrinsics
  //
  // - FPContractMode::Off disables contratction for all entry points
  //
  // - FPContractMode::Fast allows *all* operations to be contracted
  //   for all entry points
  FPContractMode FPCMode = FPContractMode::On;

  // Unknown LLVM intrinsics will be translated as external function calls in
  // SPIR-V
  std::optional<ArgList> SPIRVAllowUnknownIntrinsics{};

  // Enable support for extra DIExpression opcodes not listed in the SPIR-V
  // DebugInfo specification.
  bool AllowExtraDIExpressions = false;

  DebugInfoEIS DebugInfoVersion = DebugInfoEIS::OpenCL_DebugInfo_100;

  // Controls whether llvm.fmuladd.* should be replaced with mad from OpenCL
  // extended instruction set or with a simple fmul + fadd
  bool ReplaceLLVMFmulAddWithOpenCLMad = true;

  // Add a workaround to preserve OpenCL kernel_arg_type and
  // kernel_arg_type_qual metadata through OpString
  bool PreserveOCLKernelArgTypeMetadataThroughString = false;

  bool PreserveAuxData = false;

  BuiltinFormat SPIRVBuiltinFormat = BuiltinFormat::Function;
};

} // namespace SPIRV

#endif // SPIRV_LLVMSPIRVOPTS_H