//=== WebAssembly.h - Declare WebAssembly target feature support *- C++ -*-===//

//

// 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 declares WebAssembly TargetInfo objects.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_WEBASSEMBLY_H

#define LLVM_CLANG_LIB_BASIC_TARGETS_WEBASSEMBLY_H

#include "clang/Basic/TargetInfo.h"

#include "clang/Basic/TargetOptions.h"

#include "llvm/ADT/Triple.h"

#include "llvm/Support/Compiler.h"

namespace clang {

namespace targets {

class LLVM_LIBRARY_VISIBILITY WebAssemblyTargetInfo : public TargetInfo {

  static const Builtin::Info BuiltinInfo[];

  enum SIMDEnum {

    NoSIMD,

    SIMD128,

    UnimplementedSIMD128,

  } SIMDLevel = NoSIMD;

  bool HasNontrappingFPToInt = false;

  bool HasSignExt = false;

  bool HasExceptionHandling = false;

  bool HasBulkMemory = false;

  bool HasAtomics = false;

  bool HasMutableGlobals = false;

  bool HasMultivalue = false;

  bool HasTailCall = false;

  bool HasReferenceTypes = false;

  std::string ABI;

public:

  explicit WebAssemblyTargetInfo(const llvm::Triple &T, const TargetOptions &)

      : TargetInfo(T) {

    NoAsmVariants = true;

    SuitableAlign = 128;

    LargeArrayMinWidth = 128;

    LargeArrayAlign = 128;

    SimdDefaultAlign = 128;

    SigAtomicType = SignedLong;

    LongDoubleWidth = LongDoubleAlign = 128;

    LongDoubleFormat = &llvm::APFloat::IEEEquad();

    MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;

    // size_t being unsigned long for both wasm32 and wasm64 makes mangled names

    // more consistent between the two.

    SizeType = UnsignedLong;

    PtrDiffType = SignedLong;

    IntPtrType = SignedLong;

  }

  StringRef getABI() const override;

  bool setABI(const std::string &Name) override;

protected:

  void getTargetDefines(const LangOptions &Opts,

                        MacroBuilder &Builder) const override;

private:

  static void setSIMDLevel(llvm::StringMap<bool> &Features, SIMDEnum Level,

                           bool Enabled);

  bool

  initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,

                 StringRef CPU,

                 const std::vector<std::string> &FeaturesVec) const override;

  bool hasFeature(StringRef Feature) const final;

  void setFeatureEnabled(llvm::StringMap<bool> &Features, StringRef Name,

                         bool Enabled) const final;

  bool handleTargetFeatures(std::vector<std::string> &Features,

                            DiagnosticsEngine &Diags) final;

  bool isValidCPUName(StringRef Name) const final;

  void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const final;

  bool setCPU(const std::string &Name) final { return isValidCPUName(Name); }

  ArrayRef<Builtin::Info> getTargetBuiltins() const final;

  BuiltinVaListKind getBuiltinVaListKind() const final {

    return VoidPtrBuiltinVaList;

  }

  ArrayRef<const char *> getGCCRegNames() const final { return None; }

  ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const final {

    return None;

  }

  bool validateAsmConstraint(const char *&Name,

                             TargetInfo::ConstraintInfo &Info) const final {

    return false;

  }

  const char *getClobbers() const final { return ""; }

  bool isCLZForZeroUndef() const final { return false; }

  bool hasInt128Type() const final { return true; }

  IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {

    // WebAssembly prefers long long for explicitly 64-bit integers.

    return BitWidth == 64 ? (IsSigned ? SignedLongLong : UnsignedLongLong)

                          : TargetInfo::getIntTypeByWidth(BitWidth, IsSigned);

  }

  IntType getLeastIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {

    // WebAssembly uses long long for int_least64_t and int_fast64_t.

    return BitWidth == 64

               ? (IsSigned ? 
SignedLongLong184
 : 
UnsignedLongLong184
)

               : TargetInfo::getLeastIntTypeByWidth(BitWidth, IsSigned);

  }

  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {

    switch (CC) {

    case CC_C:

    case CC_Swift:

      return CCCR_OK;

    default:

      return CCCR_Warning;

    }

  }

  bool hasExtIntType() const override { return true; }

  bool hasProtectedVisibility() const override { return false; }

};

class LLVM_LIBRARY_VISIBILITY WebAssembly32TargetInfo

    : public WebAssemblyTargetInfo {

public:

  explicit WebAssembly32TargetInfo(const llvm::Triple &T,

                                   const TargetOptions &Opts)

      : WebAssemblyTargetInfo(T, Opts) {

    resetDataLayout("e-m:e-p:32:32-i64:64-n32:64-S128");

  }

protected:

  void getTargetDefines(const LangOptions &Opts,

                        MacroBuilder &Builder) const override;

};

class LLVM_LIBRARY_VISIBILITY WebAssembly64TargetInfo

    : public WebAssemblyTargetInfo {

public:

  explicit WebAssembly64TargetInfo(const llvm::Triple &T,

                                   const TargetOptions &Opts)

      : WebAssemblyTargetInfo(T, Opts) {

    LongAlign = LongWidth = 64;

    PointerAlign = PointerWidth = 64;

    SizeType = UnsignedLong;

    PtrDiffType = SignedLong;

    IntPtrType = SignedLong;

    resetDataLayout("e-m:e-p:64:64-i64:64-n32:64-S128");

  }

protected:

  void getTargetDefines(const LangOptions &Opts,

                        MacroBuilder &Builder) const override;

};

} // namespace targets

} // namespace clang

#endif // LLVM_CLANG_LIB_BASIC_TARGETS_WEBASSEMBLY_H