152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2010-2019 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include <fmt/core.h>
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#include <type_traits>
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#include <utility>
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///////////////////////////////////////////////////////////////////////////////
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// We define an identity macro for panic so that TCL and GCC don't decide to
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// fuck us over by redefine the symbol.
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//
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// Apparently this can't be taken care of via a '-Dpanic=panic' argument,
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// because it just ignores it for reasons I can't figure out.
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#ifdef panic
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#undef panic
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#endif
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#define panic panic
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//-----------------------------------------------------------------------------
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namespace cruft::debug::detail {
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void
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panic [[noreturn]] (const char *msg);
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void not_implemented [[noreturn]] (const char *msg);
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void unreachable [[noreturn]] (const char *msg);
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}
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//-----------------------------------------------------------------------------
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constexpr void
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panic [[noreturn]] (const char *msg)
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{
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! msg
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? panic (msg)
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: cruft::debug::detail::panic (msg);
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}
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//-----------------------------------------------------------------------------
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inline void
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panic [[noreturn]] (const std::string &msg)
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{
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panic (msg.c_str ());
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}
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template <typename TagT = void>
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constexpr void consteval_panic (void) noexcept {
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if constexpr (std::is_same_v<TagT, void>) {
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throw nullptr;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// not_implemented/unreachable/panic must be callable from constexpr contexts.
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// but they rely on functions that aren't constexpr to perform the controlled
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// abort.
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//
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// we can work around this in the same way assert does by using a conditional
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// that hides an extern function that actually does the work. as we can't
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// utilise external state this has to be the message variable which will
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// assume isn't ever null.
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//
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// to avoid warnings about a return from a noreturn function we recurse into
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// ourself in the alternate case. this branch shouldn't ever be taken, but if
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// it is we were planning on crashing anyway...
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///////////////////////////////////////////////////////////////////////////////
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constexpr void
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not_implemented [[noreturn]] (const char *msg)
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{
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! msg
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? not_implemented (msg)
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: cruft::debug::detail::not_implemented (msg);
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}
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constexpr void
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not_implemented [[noreturn]] (void)
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{
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not_implemented ("operation not implemented");
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}
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constexpr void unimplemented [[noreturn]] (void) { not_implemented (); }
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constexpr void unimplemented [[noreturn]] (const char *msg) { not_implemented (msg); }
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///////////////////////////////////////////////////////////////////////////////
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constexpr void
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unreachable [[noreturn]] (const char *msg)
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{
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! msg
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? unreachable (msg)
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: cruft::debug::detail::unreachable (msg);
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}
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constexpr void
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unreachable [[noreturn]] (void)
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{
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unreachable ("unreachable code isn't");
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}
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///////////////////////////////////////////////////////////////////////////////
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/// report a fatal error induced by an unhandled value, especially in switch
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/// statements. will almost invariably abort the application.
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namespace cruft::debug::detail {
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template <typename T>
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T
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unhandled [[noreturn]] (T &&t) noexcept
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{
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// If we've been given an enum we should handle it like its underlying
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// type so that when we end up logging it we don't accidentally
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// trigger an infinite loop of calls to `unhandled` within the
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// ostream operator. It doesn't have to be pretty, just functional.
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using base_type = std::remove_reference_t<std::decay_t<T>>;
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if constexpr (std::is_enum_v<base_type>) {
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unhandled (static_cast<std::underlying_type_t<base_type>> (t));
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} else {
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::panic (fmt::format ("unhandled value: {}", t));
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}
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}
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}
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template <typename T>
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constexpr T
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unhandled [[noreturn]] (T &&t) noexcept
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{
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cruft::debug::detail::unhandled (std::forward<T> (t));
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}
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