path: root/src/common/assert.h

// SPDX-FileCopyrightText: 2013 Dolphin Emulator Project
// SPDX-FileCopyrightText: 2014 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include "common/logging/log.h"

// Sometimes we want to try to continue even after hitting an assert.
// However touching this file yields a global recompilation as this header is included almost
// everywhere. So let's just move the handling of the failed assert to a single cpp file.
void assert_handle_failure();

[[noreturn]] void unreachable_impl();

// For asserts we'd like to keep all the junk executed when an assert happens away from the
// important code in the function. One way of doing this is to put all the relevant code inside a
// lambda and force the compiler to not inline it. Unfortunately, MSVC seems to have no syntax to
// specify __declspec on lambda functions, so what we do instead is define a noinline wrapper
// template that calls the lambda. This seems to generate an extra instruction at the call-site
// compared to the ideal implementation (which wouldn't support ASSERT_MSG parameters), but is good
// enough for our purposes.
template <typename Fn>
#if defined(_MSC_VER)
[[msvc::noinline]]
#elif defined(__GNUC__)
[[gnu::cold, gnu::noinline]]
#endif
static void
assert_noinline_call(const Fn& fn) {
    fn();
    assert_handle_failure();
}

#define ASSERT(_a_)                                                                                \
    do                                                                                             \
        if (!(_a_)) {                                                                              \
            assert_noinline_call([] { LOG_CRITICAL(Debug, "Assertion Failed!"); });                \
        }                                                                                          \
    while (0)

#define ASSERT_MSG(_a_, ...)                                                                       \
    do                                                                                             \
        if (!(_a_)) {                                                                              \
            assert_noinline_call([&] { LOG_CRITICAL(Debug, "Assertion Failed!\n" __VA_ARGS__); }); \
        }                                                                                          \
    while (0)

#define UNREACHABLE()                                                                              \
    do {                                                                                           \
        assert_noinline_call([] { LOG_CRITICAL(Debug, "Unreachable code!"); });                    \
        unreachable_impl();                                                                        \
    } while (0)

#define UNREACHABLE_MSG(...)                                                                       \
    do {                                                                                           \
        assert_noinline_call([&] { LOG_CRITICAL(Debug, "Unreachable code!\n" __VA_ARGS__); });     \
        unreachable_impl();                                                                        \
    } while (0)

#ifdef _DEBUG
#define DEBUG_ASSERT(_a_) ASSERT(_a_)
#define DEBUG_ASSERT_MSG(_a_, ...) ASSERT_MSG(_a_, __VA_ARGS__)
#else // not debug
#define DEBUG_ASSERT(_a_)                                                                          \
    do {                                                                                           \
    } while (0)
#define DEBUG_ASSERT_MSG(_a_, _desc_, ...)                                                         \
    do {                                                                                           \
    } while (0)
#endif

#define UNIMPLEMENTED() ASSERT_MSG(false, "Unimplemented code!")
#define UNIMPLEMENTED_MSG(...) ASSERT_MSG(false, __VA_ARGS__)

#define UNIMPLEMENTED_IF(cond) ASSERT_MSG(!(cond), "Unimplemented code!")
#define UNIMPLEMENTED_IF_MSG(cond, ...) ASSERT_MSG(!(cond), __VA_ARGS__)

// If the assert is ignored, execute _b_
#define ASSERT_OR_EXECUTE(_a_, _b_)                                                                \
    do {                                                                                           \
        ASSERT(_a_);                                                                               \
        if (!(_a_)) {                                                                              \
            _b_                                                                                    \
        }                                                                                          \
    } while (0)

// If the assert is ignored, execute _b_
#define ASSERT_OR_EXECUTE_MSG(_a_, _b_, ...)                                                       \
    do {                                                                                           \
        ASSERT_MSG(_a_, __VA_ARGS__);                                                              \
        if (!(_a_)) {                                                                              \
            _b_                                                                                    \
        }                                                                                          \
    } while (0)