AddressSpaces.h

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//===- AddressSpaces.h - Language-specific address spaces -------*- 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Provides definitions for the various language-specific address
/// spaces.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_BASIC_ADDRESSSPACES_H
#define LLVM_CLANG_BASIC_ADDRESSSPACES_H
 
#include <array>
#include <cassert>
#include <initializer_list>
#include <utility>
 
namespace clang {
 
/// Defines the address space values used by the address space qualifier
/// of QualType.
///
enum class LangAS : unsigned {
  // The default value 0 is the value used in QualType for the situation
  // where there is no address space qualifier.
  Default = 0,
 
  // OpenCL specific address spaces.
  // In OpenCL each l-value must have certain non-default address space, each
  // r-value must have no address space (i.e. the default address space). The
  // pointee of a pointer must have non-default address space.
  opencl_global,
  opencl_local,
  opencl_constant,
  opencl_private,
  opencl_generic,
  opencl_global_device,
  opencl_global_host,
 
  // CUDA specific address spaces.
  cuda_device,
  cuda_constant,
  cuda_shared,
 
  // SYCL specific address spaces.
  sycl_global,
  sycl_global_device,
  sycl_global_host,
  sycl_local,
  sycl_private,
 
  // Pointer size and extension address spaces.
  ptr32_sptr,
  ptr32_uptr,
  ptr64,
 
  // HLSL specific address spaces.
  hlsl_groupshared,
  hlsl_constant,
  hlsl_private,
  hlsl_device,
  hlsl_input,
  hlsl_output,
  hlsl_push_constant,
 
  // Wasm specific address spaces.
  wasm_funcref,
 
  // This denotes the count of language-specific address spaces and also
  // the offset added to the target-specific address spaces, which are usually
  // specified by address space attributes __attribute__(address_space(n))).
  FirstTargetAddressSpace
};
 
/// The type of a lookup table which maps from language-specific address spaces
/// to target-specific ones.
class LangASMap {
  std::array<unsigned, (unsigned)LangAS::FirstTargetAddressSpace> Map{};
 
public:
  constexpr LangASMap() = default;
 
  constexpr LangASMap(
      std::initializer_list<std::pair<LangAS, unsigned>> Mappings) {
    for (auto [LanguageAS, TargetAS] : Mappings)
      Map[(unsigned)LanguageAS] = TargetAS;
  }
 
  constexpr unsigned operator[](LangAS AS) const { return Map[(unsigned)AS]; }
};
 
/// \return whether \p AS is a target-specific address space rather than a
/// clang AST address space
inline bool isTargetAddressSpace(LangAS AS) {
  return (unsigned)AS >= (unsigned)LangAS::FirstTargetAddressSpace;
}
 
inline unsigned toTargetAddressSpace(LangAS AS) {
  assert(isTargetAddressSpace(AS));
  return (unsigned)AS - (unsigned)LangAS::FirstTargetAddressSpace;
}
 
inline LangAS getLangASFromTargetAS(unsigned TargetAS) {
  return static_cast<LangAS>((TargetAS) +
                             (unsigned)LangAS::FirstTargetAddressSpace);
}
 
inline bool isPtrSizeAddressSpace(LangAS AS) {
  return (AS == LangAS::ptr32_sptr || AS == LangAS::ptr32_uptr ||
          AS == LangAS::ptr64);
}
 
} // namespace clang
 
#endif // LLVM_CLANG_BASIC_ADDRESSSPACES_H