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/**
* @file decaf/common.h
* @author Mike Hamburg
*
* @copyright
* Copyright (c) 2015 Cryptography Research, Inc. \n
* Released under the MIT License. See LICENSE.txt for license information.
*
* @brief Common utility headers for Decaf library.
*/
#ifndef __DECAF_COMMON_H__
#define __DECAF_COMMON_H__ 1
#include <stdint.h>
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Goldilocks' build flags default to hidden and stripping executables. */
/** @cond internal */
#if defined(DOXYGEN) && !defined(__attribute__)
#define __attribute__((x))
#endif
#define DECAF_API_VIS __attribute__((visibility("default")))
#define DECAF_NOINLINE __attribute__((noinline))
#define DECAF_WARN_UNUSED __attribute__((warn_unused_result))
#define DECAF_NONNULL __attribute__((nonnull))
#define DECAF_INLINE inline __attribute__((always_inline,unused))
/** @endcond */
/* Internal word types.
*
* Somewhat tricky. This could be decided separately per platform. However,
* the structs do need to be all the same size and alignment on a given
* platform to support dynamic linking, since even if you header was built
* with eg arch_neon, you might end up linking a library built with arch_arm32.
*/
#ifndef DECAF_WORD_BITS
#if (defined(__ILP64__) || defined(__amd64__) || defined(__x86_64__) || (((__UINT_FAST32_MAX__)>>30)>>30))
#define DECAF_WORD_BITS 64 /**< The number of bits in a word */
#else
#define DECAF_WORD_BITS 32 /**< The number of bits in a word */
#endif
#endif
#if DECAF_WORD_BITS == 64
typedef uint64_t decaf_word_t; /**< Word size for internal computations */
typedef int64_t decaf_sword_t; /**< Signed word size for internal computations */
typedef uint64_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
typedef __uint128_t decaf_dword_t; /**< Double-word size for internal computations */
typedef __int128_t decaf_dsword_t; /**< Signed double-word size for internal computations */
#elif DECAF_WORD_BITS == 32 /**< The number of bits in a word */
typedef uint32_t decaf_word_t; /**< Word size for internal computations */
typedef int32_t decaf_sword_t; /**< Signed word size for internal computations */
typedef uint32_t decaf_bool_t; /**< "Boolean" type, will be set to all-zero or all-one (i.e. -1u) */
typedef uint64_t decaf_dword_t; /**< Double-word size for internal computations */
typedef int64_t decaf_dsword_t; /**< Signed double-word size for internal computations */
#else
#error "Only supporting DECAF_WORD_BITS = 32 or 64 for now"
#endif
/** DECAF_TRUE = -1 so that DECAF_TRUE & x = x */
static const decaf_bool_t DECAF_TRUE = -(decaf_bool_t)1;
/** DECAF_FALSE = 0 so that DECAF_FALSE & x = 0 */
static const decaf_bool_t DECAF_FALSE = 0;
/** Another boolean type used to indicate success or failure. */
typedef enum {
DECAF_SUCCESS = -1, /**< The operation succeeded. */
DECAF_FAILURE = 0 /**< The operation failed. */
} decaf_error_t;
/** Return success if x is true */
static DECAF_INLINE decaf_error_t
decaf_succeed_if(decaf_bool_t x) {
return (decaf_error_t)x;
}
/** Return DECAF_TRUE iff x == DECAF_SUCCESS */
static DECAF_INLINE decaf_bool_t
decaf_successful(decaf_error_t e) {
decaf_dword_t w = ((decaf_word_t)e) ^ ((decaf_word_t)DECAF_SUCCESS);
return (w-1)>>DECAF_WORD_BITS;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* __DECAF_COMMON_H__ */
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