assert.h

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/*
* Runtime assertion checking
* (C) 2010,2018 Jack Lloyd
*     2017 Simon Warta (Kullo GmbH)
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_ASSERTION_CHECKING_H_
#define BOTAN_ASSERTION_CHECKING_H_
 
#include <botan/build.h>
 
namespace Botan {
 
/**
* Called when an assertion fails
* Throws an Exception object
*/
[[noreturn]] void BOTAN_PUBLIC_API(2,0)
   assertion_failure(const char* expr_str,
                     const char* assertion_made,
                     const char* func,
                     const char* file,
                     int line);
 
/**
* Called when an invalid argument is used
* Throws Invalid_Argument
*/
[[noreturn]] void BOTAN_UNSTABLE_API throw_invalid_argument(const char* message,
                                                            const char* func,
                                                            const char* file);
 
 
#define BOTAN_ARG_CHECK(expr, msg)                                      \
   do { if(!(expr)) Botan::throw_invalid_argument(msg, __func__, __FILE__); } while(0)
 
/**
* Called when an invalid state is encountered
* Throws Invalid_State
*/
[[noreturn]] void BOTAN_UNSTABLE_API throw_invalid_state(const char* message,
                                                         const char* func,
                                                         const char* file);
 
 
#define BOTAN_STATE_CHECK(expr)                                     \
   do { if(!(expr)) Botan::throw_invalid_state(#expr, __func__, __FILE__); } while(0)
 
/**
* Make an assertion
*/
#define BOTAN_ASSERT(expr, assertion_made)                \
   do {                                                   \
      if(!(expr))                                         \
         Botan::assertion_failure(#expr,                  \
                                  assertion_made,         \
                                  __func__,               \
                                  __FILE__,               \
                                  __LINE__);              \
   } while(0)
 
/**
* Make an assertion
*/
#define BOTAN_ASSERT_NOMSG(expr)                          \
   do {                                                   \
      if(!(expr))                                         \
         Botan::assertion_failure(#expr,                  \
                                  "",                     \
                                  __func__,               \
                                  __FILE__,               \
                                  __LINE__);              \
   } while(0)
 
/**
* Assert that value1 == value2
*/
#define BOTAN_ASSERT_EQUAL(expr1, expr2, assertion_made)   \
   do {                                                    \
     if((expr1) != (expr2))                                \
       Botan::assertion_failure(#expr1 " == " #expr2,      \
                                assertion_made,            \
                                __func__,                  \
                                __FILE__,                  \
                                __LINE__);                 \
   } while(0)
 
/**
* Assert that expr1 (if true) implies expr2 is also true
*/
#define BOTAN_ASSERT_IMPLICATION(expr1, expr2, msg)        \
   do {                                                    \
     if((expr1) && !(expr2))                               \
       Botan::assertion_failure(#expr1 " implies " #expr2, \
                                msg,                       \
                                __func__,                  \
                                __FILE__,                  \
                                __LINE__);                 \
   } while(0)
 
/**
* Assert that a pointer is not null
*/
#define BOTAN_ASSERT_NONNULL(ptr)                          \
   do {                                                    \
     if((ptr) == nullptr)                                  \
         Botan::assertion_failure(#ptr " is not null",     \
                                  "",                      \
                                  __func__,                \
                                  __FILE__,                \
                                  __LINE__);               \
   } while(0)
 
#if defined(BOTAN_ENABLE_DEBUG_ASSERTS)
 
#define BOTAN_DEBUG_ASSERT(expr) BOTAN_ASSERT_NOMSG(expr)
 
#else
 
#define BOTAN_DEBUG_ASSERT(expr) do {} while(0)
 
#endif
 
/**
* Mark variable as unused. Takes between 1 and 9 arguments and marks all as unused,
* e.g. BOTAN_UNUSED(a); or BOTAN_UNUSED(x, y, z);
*/
#define _BOTAN_UNUSED_IMPL1(a)                         static_cast<void>(a)
#define _BOTAN_UNUSED_IMPL2(a, b)                      static_cast<void>(a); _BOTAN_UNUSED_IMPL1(b)
#define _BOTAN_UNUSED_IMPL3(a, b, c)                   static_cast<void>(a); _BOTAN_UNUSED_IMPL2(b, c)
#define _BOTAN_UNUSED_IMPL4(a, b, c, d)                static_cast<void>(a); _BOTAN_UNUSED_IMPL3(b, c, d)
#define _BOTAN_UNUSED_IMPL5(a, b, c, d, e)             static_cast<void>(a); _BOTAN_UNUSED_IMPL4(b, c, d, e)
#define _BOTAN_UNUSED_IMPL6(a, b, c, d, e, f)          static_cast<void>(a); _BOTAN_UNUSED_IMPL5(b, c, d, e, f)
#define _BOTAN_UNUSED_IMPL7(a, b, c, d, e, f, g)       static_cast<void>(a); _BOTAN_UNUSED_IMPL6(b, c, d, e, f, g)
#define _BOTAN_UNUSED_IMPL8(a, b, c, d, e, f, g, h)    static_cast<void>(a); _BOTAN_UNUSED_IMPL7(b, c, d, e, f, g, h)
#define _BOTAN_UNUSED_IMPL9(a, b, c, d, e, f, g, h, i) static_cast<void>(a); _BOTAN_UNUSED_IMPL8(b, c, d, e, f, g, h, i)
#define _BOTAN_UNUSED_GET_IMPL(_1, _2, _3, _4, _5, _6, _7, _8, _9, IMPL_NAME, ...) IMPL_NAME
 
#define BOTAN_UNUSED(...) _BOTAN_UNUSED_GET_IMPL(__VA_ARGS__,                      \
                                                 _BOTAN_UNUSED_IMPL9,              \
                                                 _BOTAN_UNUSED_IMPL8,              \
                                                 _BOTAN_UNUSED_IMPL7,              \
                                                 _BOTAN_UNUSED_IMPL6,              \
                                                 _BOTAN_UNUSED_IMPL5,              \
                                                 _BOTAN_UNUSED_IMPL4,              \
                                                 _BOTAN_UNUSED_IMPL3,              \
                                                 _BOTAN_UNUSED_IMPL2,              \
                                                 _BOTAN_UNUSED_IMPL1,              \
                                                 unused dummy rest value           \
                          ) /* we got an one of _BOTAN_UNUSED_IMPL*, now call it */ (__VA_ARGS__)
 
/*
* Define Botan::unreachable()
*
* There is a pending WG21 proposal for `std::unreachable()`
*   http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0627r3.pdf
*/
[[noreturn]] BOTAN_FORCE_INLINE void unreachable()
   {
#if BOTAN_COMPILER_HAS_BUILTIN(__builtin_unreachable)
   __builtin_unreachable();
#elif defined(_MSC_VER) // MSVC
   __assume(false);
#else
   return; // undefined behaviour, just like the others...
#endif
   }
 
}
 
#endif