#ifndef SIMDJSON_COMMON_DEFS_H
#define SIMDJSON_COMMON_DEFS_H

#include <cassert>
#include "simdjson/portability.h"

namespace simdjson {

#ifndef SIMDJSON_EXCEPTIONS
#if __cpp_exceptions
#define SIMDJSON_EXCEPTIONS 1
#else
#define SIMDJSON_EXCEPTIONS 0
#endif
#endif

/** The maximum document size supported by simdjson. */
constexpr size_t SIMDJSON_MAXSIZE_BYTES = 0xFFFFFFFF;

/**
 * The amount of padding needed in a buffer to parse JSON.
 *
 * the input buf should be readable up to buf + SIMDJSON_PADDING
 * this is a stopgap; there should be a better description of the
 * main loop and its behavior that abstracts over this
 * See https://github.com/lemire/simdjson/issues/174
 */
constexpr size_t SIMDJSON_PADDING = 32;

/**
 * By default, simdjson supports this many nested objects and arrays.
 *
 * This is the default for parser::max_depth().
 */
constexpr size_t DEFAULT_MAX_DEPTH = 1024;

} // namespace simdjson

#if defined(__GNUC__)
  // Marks a block with a name so that MCA analysis can see it.
  #define BEGIN_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-BEGIN " #name);
  #define END_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-END " #name);
  #define DEBUG_BLOCK(name, block) BEGIN_DEBUG_BLOCK(name); block; END_DEBUG_BLOCK(name);
#else
  #define BEGIN_DEBUG_BLOCK(name)
  #define END_DEBUG_BLOCK(name)
  #define DEBUG_BLOCK(name, block)
#endif

#if !defined(SIMDJSON_REGULAR_VISUAL_STUDIO) && !defined(SIMDJSON_NO_COMPUTED_GOTO)
  // We assume here that *only* regular visual studio
  // does not support computed gotos.
  // Implemented using Labels as Values which works in GCC and CLANG (and maybe
  // also in Intel's compiler), but won't work in MSVC.
  // Compute gotos are good for performance, enable them if you can.
  #define SIMDJSON_USE_COMPUTED_GOTO
#endif

// Align to N-byte boundary
#define ROUNDUP_N(a, n) (((a) + ((n)-1)) & ~((n)-1))
#define ROUNDDOWN_N(a, n) ((a) & ~((n)-1))

#define ISALIGNED_N(ptr, n) (((uintptr_t)(ptr) & ((n)-1)) == 0)

#if defined(SIMDJSON_REGULAR_VISUAL_STUDIO)

  #define really_inline __forceinline
  #define never_inline __declspec(noinline)

  #define UNUSED
  #define WARN_UNUSED

  #ifndef likely
  #define likely(x) x
  #endif
  #ifndef unlikely
  #define unlikely(x) x
  #endif

  #define SIMDJSON_PUSH_DISABLE_WARNINGS __pragma(warning( push ))
  #define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS __pragma(warning( push, 0 ))
  #define SIMDJSON_DISABLE_VS_WARNING(WARNING_NUMBER) __pragma(warning( disable : WARNING_NUMBER ))
  // Get rid of Intellisense-only warnings (Code Analysis)
  // Though __has_include is C++17, it is supported in Visual Studio 2017 or better (_MSC_VER>=1910).
  #if defined(_MSC_VER) && (_MSC_VER>=1910) 
  #if __has_include(<CppCoreCheck\Warnings.h>)
  #include <CppCoreCheck\Warnings.h>
  #define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_VS_WARNING(ALL_CPPCORECHECK_WARNINGS)
  #endif
  #endif

  #ifndef SIMDJSON_DISABLE_UNDESIRED_WARNINGS
  #define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
  #endif

  #define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_VS_WARNING(4996)
  #define SIMDJSON_POP_DISABLE_WARNINGS __pragma(warning( pop ))

#else // SIMDJSON_REGULAR_VISUAL_STUDIO

  #define really_inline inline __attribute__((always_inline, unused))
  #define never_inline inline __attribute__((noinline, unused))

  #define UNUSED __attribute__((unused))
  #define WARN_UNUSED __attribute__((warn_unused_result))

  #ifndef likely
  #define likely(x) __builtin_expect(!!(x), 1)
  #endif
  #ifndef unlikely
  #define unlikely(x) __builtin_expect(!!(x), 0)
  #endif

  #define SIMDJSON_PUSH_DISABLE_WARNINGS _Pragma("GCC diagnostic push")
  // gcc doesn't seem to disable all warnings with all and extra, add warnings here as necessary
  #define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS SIMDJSON_PUSH_DISABLE_WARNINGS \
    SIMDJSON_DISABLE_GCC_WARNING(-Weffc++) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wall) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wconversion) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wextra) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wattributes) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wimplicit-fallthrough) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wnon-virtual-dtor) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wreturn-type) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wshadow) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wunused-parameter) \
    SIMDJSON_DISABLE_GCC_WARNING(-Wunused-variable)
  #define SIMDJSON_PRAGMA(P) _Pragma(#P)
  #define SIMDJSON_DISABLE_GCC_WARNING(WARNING) SIMDJSON_PRAGMA(GCC diagnostic ignored #WARNING)
  #if defined(SIMDJSON_CLANG_VISUAL_STUDIO)
  #define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_GCC_WARNING(-Wmicrosoft-include)
  #else
  #define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
  #endif
  #define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_GCC_WARNING(-Wdeprecated-declarations)
  #define SIMDJSON_POP_DISABLE_WARNINGS _Pragma("GCC diagnostic pop")



#endif // MSC_VER

#if defined(SIMDJSON_VISUAL_STUDIO)
    /**
     * It does not matter here whether you are using
     * the regular visual studio or clang under visual
     * studio.
     */
    #if SIMDJSON_USING_LIBRARY
    #define SIMDJSON_DLLIMPORTEXPORT __declspec(dllimport)
    #else
    #define SIMDJSON_DLLIMPORTEXPORT __declspec(dllexport)
    #endif
#else
    #define SIMDJSON_DLLIMPORTEXPORT
#endif

// C++17 requires string_view.
#if SIMDJSON_CPLUSPLUS17
#define SIMDJSON_HAS_STRING_VIEW
#endif

// This macro (__cpp_lib_string_view) has to be defined
// for C++17 and better, but if it is otherwise defined,
// we are going to assume that string_view is available
// even if we do not have C++17 support.
#ifdef __cpp_lib_string_view
#define SIMDJSON_HAS_STRING_VIEW
#endif

// Some systems have string_view even if we do not have C++17 support,
// and even if __cpp_lib_string_view is undefined, it is the case
// with Apple clang version 11.
// We must handle it. *This is important.*
#ifndef SIMDJSON_HAS_STRING_VIEW
#if defined __has_include
// do not combine the next #if with the previous one (unsafe)
#if __has_include (<string_view>)
// now it is safe to trigger the include
#include <string_view> // though the file is there, it does not follow that we got the implementation
#if defined(_LIBCPP_STRING_VIEW)
// Ah! So we under libc++ which under its Library Fundamentals Technical Specification, which preceeded C++17,
// included string_view.
// This means that we have string_view *even though* we may not have C++17.
#define SIMDJSON_HAS_STRING_VIEW
#endif // _LIBCPP_STRING_VIEW
#endif // __has_include (<string_view>)
#endif // defined __has_include
#endif // def SIMDJSON_HAS_STRING_VIEW
// end of complicated but important routine to try to detect string_view.

//
// Backfill std::string_view using nonstd::string_view on systems where
// we expect that string_view is missing. Important: if we get this wrong,
// we will end up with two string_view definitions and potential trouble.
// That is why we work so hard above to avoid it.
//
#ifndef SIMDJSON_HAS_STRING_VIEW
SIMDJSON_PUSH_DISABLE_ALL_WARNINGS
#include "simdjson/nonstd/string_view.hpp"
SIMDJSON_POP_DISABLE_WARNINGS

namespace std {
  using string_view = nonstd::string_view;
}
#endif // SIMDJSON_HAS_STRING_VIEW
#undef SIMDJSON_HAS_STRING_VIEW // We are not going to need this macro anymore.

#endif // SIMDJSON_COMMON_DEFS_H
