106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifdef __UTIL_DEBUG_IPP
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#error
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#endif
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#define __UTIL_DEBUG_IPP
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#include "./format.hpp"
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#include <limits>
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///////////////////////////////////////////////////////////////////////////////
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namespace util { namespace debug { namespace detail {
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void panic [[noreturn]] (const char *msg);
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template <typename ...Args, size_t N>
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constexpr
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void panic [[noreturn]] (const char (&fmt)[N], const Args& ...args)
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{
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auto msg = util::format::render (fmt, args...);
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panic (msg.c_str ());
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}
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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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// 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 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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//-----------------------------------------------------------------------------
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constexpr void 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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: util::debug::detail::not_implemented (msg);
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}
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///////////////////////////////////////////////////////////////////////////////
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constexpr void unreachable [[noreturn]] (void)
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{
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unreachable ("unreachable code executed");
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}
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//-----------------------------------------------------------------------------
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constexpr void unreachable [[noreturn]] (const char *msg)
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{
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! msg
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? unreachable (msg)
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: util::debug::detail::unreachable (msg);
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}
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///////////////////////////////////////////////////////////////////////////////
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constexpr void panic [[noreturn]] (const char *msg)
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{
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! msg
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? panic (msg)
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: util::debug::detail::panic (msg);
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}
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//-----------------------------------------------------------------------------
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template <typename ...Args, size_t N>
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constexpr
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void
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panic [[noreturn]] (const char (&fmt)[N], const Args& ...args)
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{
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util::debug::detail::panic (fmt, args...);
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}
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