//===--- SPIR.cpp - Implement SPIR and SPIR-V target feature support ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements SPIR and SPIR-V TargetInfo objects.
//
//===----------------------------------------------------------------------===//

#include "SPIR.h"
#include "AMDGPU.h"
#include "Targets.h"
#include "clang/Basic/MacroBuilder.h"
#include "clang/Basic/TargetBuiltins.h"
#include "llvm/TargetParser/TargetParser.h"

using namespace clang;
using namespace clang::targets;

static constexpr Builtin::Info BuiltinInfo[] = {
#define BUILTIN(ID, TYPE, ATTRS)                                               \
  {#ID, TYPE, ATTRS, nullptr, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
#include "clang/Basic/BuiltinsSPIRV.inc"
};

ArrayRef<Builtin::Info> SPIRVTargetInfo::getTargetBuiltins() const {
  return llvm::ArrayRef(BuiltinInfo,
                        clang::SPIRV::LastTSBuiltin - Builtin::FirstTSBuiltin);
}

void SPIRTargetInfo::getTargetDefines(const LangOptions &Opts,
                                      MacroBuilder &Builder) const {
  DefineStd(Builder, "SPIR", Opts);
}

void SPIR32TargetInfo::getTargetDefines(const LangOptions &Opts,
                                        MacroBuilder &Builder) const {
  SPIRTargetInfo::getTargetDefines(Opts, Builder);
  DefineStd(Builder, "SPIR32", Opts);
}

void SPIR64TargetInfo::getTargetDefines(const LangOptions &Opts,
                                        MacroBuilder &Builder) const {
  SPIRTargetInfo::getTargetDefines(Opts, Builder);
  DefineStd(Builder, "SPIR64", Opts);
}

void BaseSPIRVTargetInfo::getTargetDefines(const LangOptions &Opts,
                                           MacroBuilder &Builder) const {
  DefineStd(Builder, "SPIRV", Opts);
}

void SPIRVTargetInfo::getTargetDefines(const LangOptions &Opts,
                                       MacroBuilder &Builder) const {
  BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
}

void SPIRV32TargetInfo::getTargetDefines(const LangOptions &Opts,
                                         MacroBuilder &Builder) const {
  BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
  DefineStd(Builder, "SPIRV32", Opts);
}

void SPIRV64TargetInfo::getTargetDefines(const LangOptions &Opts,
                                         MacroBuilder &Builder) const {
  BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
  DefineStd(Builder, "SPIRV64", Opts);
}

static const AMDGPUTargetInfo AMDGPUTI(llvm::Triple("amdgcn-amd-amdhsa"), {});

ArrayRef<const char *> SPIRV64AMDGCNTargetInfo::getGCCRegNames() const {
  return AMDGPUTI.getGCCRegNames();
}

bool SPIRV64AMDGCNTargetInfo::initFeatureMap(
    llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef,
    const std::vector<std::string> &FeatureVec) const {
  llvm::AMDGPU::fillAMDGPUFeatureMap({}, getTriple(), Features);

  return TargetInfo::initFeatureMap(Features, Diags, {}, FeatureVec);
}

bool SPIRV64AMDGCNTargetInfo::validateAsmConstraint(
    const char *&Name, TargetInfo::ConstraintInfo &Info) const {
  return AMDGPUTI.validateAsmConstraint(Name, Info);
}

std::string
SPIRV64AMDGCNTargetInfo::convertConstraint(const char *&Constraint) const {
  return AMDGPUTI.convertConstraint(Constraint);
}

ArrayRef<Builtin::Info> SPIRV64AMDGCNTargetInfo::getTargetBuiltins() const {
  return AMDGPUTI.getTargetBuiltins();
}

void SPIRV64AMDGCNTargetInfo::getTargetDefines(const LangOptions &Opts,
                                               MacroBuilder &Builder) const {
  BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
  DefineStd(Builder, "SPIRV64", Opts);

  Builder.defineMacro("__AMD__");
  Builder.defineMacro("__AMDGPU__");
  Builder.defineMacro("__AMDGCN__");
}

void SPIRV64AMDGCNTargetInfo::setAuxTarget(const TargetInfo *Aux) {
  assert(Aux && "Cannot invoke setAuxTarget without a valid auxiliary target!");

  // This is a 1:1 copy of AMDGPUTargetInfo::setAuxTarget()
  assert(HalfFormat == Aux->HalfFormat);
  assert(FloatFormat == Aux->FloatFormat);
  assert(DoubleFormat == Aux->DoubleFormat);

  // On x86_64 long double is 80-bit extended precision format, which is
  // not supported by AMDGPU. 128-bit floating point format is also not
  // supported by AMDGPU. Therefore keep its own format for these two types.
  auto SaveLongDoubleFormat = LongDoubleFormat;
  auto SaveFloat128Format = Float128Format;
  auto SaveLongDoubleWidth = LongDoubleWidth;
  auto SaveLongDoubleAlign = LongDoubleAlign;
  copyAuxTarget(Aux);
  LongDoubleFormat = SaveLongDoubleFormat;
  Float128Format = SaveFloat128Format;
  LongDoubleWidth = SaveLongDoubleWidth;
  LongDoubleAlign = SaveLongDoubleAlign;
  // For certain builtin types support on the host target, claim they are
  // supported to pass the compilation of the host code during the device-side
  // compilation.
  // FIXME: As the side effect, we also accept `__float128` uses in the device
  // code. To reject these builtin types supported in the host target but not in
  // the device target, one approach would support `device_builtin` attribute
  // so that we could tell the device builtin types from the host ones. This
  // also solves the different representations of the same builtin type, such
  // as `size_t` in the MSVC environment.
  if (Aux->hasFloat128Type()) {
    HasFloat128 = true;
    Float128Format = DoubleFormat;
  }
}