TheRock/compiler/amd-llvm/libcxx/test/libcxx-03/strings/basic.string/abi.compile.pass.cpp

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

#include <cstdint>
#include <string>

#include "min_allocator.h"
#include "test_allocator.h"
#include "test_macros.h"

template <class T>
class small_pointer {
public:
  using value_type        = T;
  using difference_type   = std::int16_t;
  using pointer           = small_pointer;
  using reference         = T&;
  using iterator_category = std::random_access_iterator_tag;

private:
  std::uint16_t offset;
};

template <class T>
class small_iter_allocator {
public:
  using value_type      = T;
  using pointer         = small_pointer<T>;
  using size_type       = std::int16_t;
  using difference_type = std::int16_t;

  small_iter_allocator() TEST_NOEXCEPT {}

  template <class U>
  small_iter_allocator(small_iter_allocator<U>) TEST_NOEXCEPT {}

  T* allocate(std::size_t n);
  void deallocate(T* p, std::size_t);

  friend bool operator==(small_iter_allocator, small_iter_allocator) { return true; }
  friend bool operator!=(small_iter_allocator, small_iter_allocator) { return false; }
};

struct allocator_base {};

// Make sure that types with a common base type don't get broken. See https://llvm.org/PR154146
template <class T>
struct common_base_allocator : allocator_base {
  using value_type = T;

  common_base_allocator() TEST_NOEXCEPT {}

  template <class U>
  common_base_allocator(common_base_allocator<U>) TEST_NOEXCEPT {}

  T* allocate(std::size_t n);
  void deallocate(T* p, std::size_t);

  friend bool operator==(common_base_allocator, common_base_allocator) { return true; }
  friend bool operator!=(common_base_allocator, common_base_allocator) { return false; }
};

template <class Alloc>
using string_alloc = std::basic_string<char, std::char_traits<char>, Alloc>;

struct user_struct {
  string_alloc<common_base_allocator<char> > v;
  [[no_unique_address]] common_base_allocator<int> a;
};

#if __SIZE_WIDTH__ == 64
static_assert(sizeof(user_struct) == 32, "");
static_assert(TEST_ALIGNOF(user_struct) == 8, "");

static_assert(sizeof(string_alloc<std::allocator<char> >) == 24, "");
static_assert(sizeof(string_alloc<min_allocator<char> >) == 24, "");
static_assert(sizeof(string_alloc<test_allocator<char> >) == 32, "");
static_assert(sizeof(string_alloc<small_iter_allocator<char> >) == 6, "");

static_assert(TEST_ALIGNOF(string_alloc<std::allocator<char> >) == 8, "");
static_assert(TEST_ALIGNOF(string_alloc<min_allocator<char> >) == 8, "");
static_assert(TEST_ALIGNOF(string_alloc<test_allocator<char> >) == 8, "");
static_assert(TEST_ALIGNOF(string_alloc<small_iter_allocator<char> >) == 2, "");

#elif __SIZE_WIDTH__ == 32
static_assert(sizeof(user_struct) == 16, "");
static_assert(TEST_ALIGNOF(user_struct) == 4, "");

static_assert(sizeof(string_alloc<std::allocator<char> >) == 12, "");
static_assert(sizeof(string_alloc<min_allocator<char> >) == 12, "");
static_assert(sizeof(string_alloc<test_allocator<char> >) == 24, "");
static_assert(sizeof(string_alloc<small_iter_allocator<char> >) == 6, "");

static_assert(TEST_ALIGNOF(string_alloc<std::allocator<char> >) == 4, "");
static_assert(TEST_ALIGNOF(string_alloc<min_allocator<char> >) == 4, "");
static_assert(TEST_ALIGNOF(string_alloc<test_allocator<char> >) == 4, "");
static_assert(TEST_ALIGNOF(string_alloc<small_iter_allocator<char> >) == 2, "");

#else
#  error std::size_t has an unexpected size
#endif