check.h

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// Copyright (c) 2019-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_UTIL_CHECK_H
#define BITCOIN_UTIL_CHECK_H
 
#include <attributes.h>
 
#include <atomic>
#include <cassert> // IWYU pragma: export
#include <stdexcept>
#include <string>
#include <string_view>
#include <utility>
 
constexpr bool G_FUZZING_BUILD{
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
    true
#else
    false
#endif
};
constexpr bool G_ABORT_ON_FAILED_ASSUME{
#ifdef ABORT_ON_FAILED_ASSUME
    true
#else
    false
#endif
};
 
extern std::atomic<bool> g_enable_dynamic_fuzz_determinism;
 
inline bool EnableFuzzDeterminism()
{
    if constexpr (G_FUZZING_BUILD) {
        return true;
    } else if constexpr (!G_ABORT_ON_FAILED_ASSUME) {
        // Running fuzz tests is always disabled if Assume() doesn't abort
        // (ie, non-fuzz non-debug builds), as otherwise tests which
        // should fail due to a failing Assume may still pass. As such,
        // we also statically disable fuzz determinism in that case.
        return false;
    } else {
        return g_enable_dynamic_fuzz_determinism;
    }
}
 
std::string StrFormatInternalBug(std::string_view msg, std::string_view file, int line, std::string_view func);
 
class NonFatalCheckError : public std::runtime_error
{
public:
    NonFatalCheckError(std::string_view msg, std::string_view file, int line, std::string_view func);
};
 
template <typename T>
T&& inline_check_non_fatal(LIFETIMEBOUND T&& val, const char* file, int line, const char* func, const char* assertion)
{
    if (!val) {
        throw NonFatalCheckError{assertion, file, line, func};
    }
    return std::forward<T>(val);
}
 
#if defined(NDEBUG)
#error "Cannot compile without assertions!"
#endif
 
void assertion_fail(std::string_view file, int line, std::string_view func, std::string_view assertion);
 
template <bool IS_ASSERT, typename T>
constexpr T&& inline_assertion_check(LIFETIMEBOUND T&& val, [[maybe_unused]] const char* file, [[maybe_unused]] int line, [[maybe_unused]] const char* func, [[maybe_unused]] const char* assertion)
{
    if (IS_ASSERT || std::is_constant_evaluated() || G_FUZZING_BUILD || G_ABORT_ON_FAILED_ASSUME) {
        if (!val) {
            assertion_fail(file, line, func, assertion);
        }
    }
    return std::forward<T>(val);
}
 
// All macros may use __func__ inside a lambda, so put them under nolint.
// NOLINTBEGIN(bugprone-lambda-function-name)
 
#define STR_INTERNAL_BUG(msg) StrFormatInternalBug((msg), __FILE__, __LINE__, __func__)
 
#define CHECK_NONFATAL(condition) \
    inline_check_non_fatal(condition, __FILE__, __LINE__, __func__, #condition)
 
#define Assert(val) inline_assertion_check<true>(val, __FILE__, __LINE__, __func__, #val)
 
#define Assume(val) inline_assertion_check<false>(val, __FILE__, __LINE__, __func__, #val)
 
#define NONFATAL_UNREACHABLE()                                        \
    throw NonFatalCheckError(                                         \
        "Unreachable code reached (non-fatal)", __FILE__, __LINE__, __func__)
 
// NOLINTEND(bugprone-lambda-function-name)
 
#endif // BITCOIN_UTIL_CHECK_H