/* MIT License
 *
 * Copyright (c) 2016-2017 INRIA and Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef __KREMLIB_BASE_H
#define __KREMLIB_BASE_H

#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

/******************************************************************************/
/* Some macros to ease compatibility                                          */
/******************************************************************************/

/* Define __cdecl and friends when using GCC, so that we can safely compile code
 * that contains __cdecl on all platforms. Note that this is in a separate
 * header so that Dafny-generated code can include just this file. */
#ifndef _MSC_VER
/* Use the gcc predefined macros if on a platform/architectures that set them.
 * Otherwise define them to be empty. */
#ifndef __cdecl
#define __cdecl
#endif
#ifndef __stdcall
#define __stdcall
#endif
#ifndef __fastcall
#define __fastcall
#endif
#endif

#ifdef __GNUC__
#  define inline __inline__
#endif

/* GCC-specific attribute syntax; everyone else gets the standard C inline
 * attribute. */
#ifdef __GNU_C__
#  ifndef __clang__
#    define force_inline inline __attribute__((always_inline))
#  else
#    define force_inline inline
#  endif
#else
#  define force_inline inline
#endif


/******************************************************************************/
/* Implementing C.fst                                                         */
/******************************************************************************/

/* Uppercase issue; we have to define lowercase versions of the C macros (as we
 * have no way to refer to an uppercase *variable* in F*). */
extern int exit_success;
extern int exit_failure;

/* This one allows the user to write C.EXIT_SUCCESS. */
typedef int exit_code;

void print_string(const char *s);
void print_bytes(uint8_t *b, uint32_t len);

/* The universal null pointer defined in C.Nullity.fst */
#define C_Nullity_null(X) 0

/* If some globals need to be initialized before the main, then kremlin will
 * generate and try to link last a function with this type: */
void kremlinit_globals(void);

/******************************************************************************/
/* Implementation of machine integers (possibly of 128-bit integers)          */
/******************************************************************************/

/* Integer types */
typedef uint64_t FStar_UInt64_t, FStar_UInt64_t_;
typedef int64_t FStar_Int64_t, FStar_Int64_t_;
typedef uint32_t FStar_UInt32_t, FStar_UInt32_t_;
typedef int32_t FStar_Int32_t, FStar_Int32_t_;
typedef uint16_t FStar_UInt16_t, FStar_UInt16_t_;
typedef int16_t FStar_Int16_t, FStar_Int16_t_;
typedef uint8_t FStar_UInt8_t, FStar_UInt8_t_;
typedef int8_t FStar_Int8_t, FStar_Int8_t_;

static inline uint32_t rotate32_left(uint32_t x, uint32_t n) {
  /*  assert (n<32); */
  return (x << n) | (x >> (32 - n));
}
static inline uint32_t rotate32_right(uint32_t x, uint32_t n) {
  /*  assert (n<32); */
  return (x >> n) | (x << (32 - n));
}

/* Constant time comparisons */
static inline uint8_t FStar_UInt8_eq_mask(uint8_t x, uint8_t y) {
  x = ~(x ^ y);
  x &= x << 4;
  x &= x << 2;
  x &= x << 1;
  return (int8_t)x >> 7;
}

static inline uint8_t FStar_UInt8_gte_mask(uint8_t x, uint8_t y) {
  return ~(uint8_t)(((int32_t)x - y) >> 31);
}

static inline uint16_t FStar_UInt16_eq_mask(uint16_t x, uint16_t y) {
  x = ~(x ^ y);
  x &= x << 8;
  x &= x << 4;
  x &= x << 2;
  x &= x << 1;
  return (int16_t)x >> 15;
}

static inline uint16_t FStar_UInt16_gte_mask(uint16_t x, uint16_t y) {
  return ~(uint16_t)(((int32_t)x - y) >> 31);
}

static inline uint32_t FStar_UInt32_eq_mask(uint32_t x, uint32_t y) {
  x = ~(x ^ y);
  x &= x << 16;
  x &= x << 8;
  x &= x << 4;
  x &= x << 2;
  x &= x << 1;
  return ((int32_t)x) >> 31;
}

static inline uint32_t FStar_UInt32_gte_mask(uint32_t x, uint32_t y) {
  return ~((uint32_t)(((int64_t)x - y) >> 63));
}

static inline uint64_t FStar_UInt64_eq_mask(uint64_t x, uint64_t y) {
  x = ~(x ^ y);
  x &= x << 32;
  x &= x << 16;
  x &= x << 8;
  x &= x << 4;
  x &= x << 2;
  x &= x << 1;
  return ((int64_t)x) >> 63;
}

static inline uint64_t FStar_UInt64_gte_mask(uint64_t x, uint64_t y) {
  uint64_t low63 =
      ~((uint64_t)((int64_t)((int64_t)(x & UINT64_C(0x7fffffffffffffff)) -
                             (int64_t)(y & UINT64_C(0x7fffffffffffffff))) >>
                   63));
  uint64_t high_bit =
      ~((uint64_t)((int64_t)((int64_t)(x & UINT64_C(0x8000000000000000)) -
                             (int64_t)(y & UINT64_C(0x8000000000000000))) >>
                   63));
  return low63 & high_bit;
}


#endif
