mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 15:00:51 +01:00
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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// This header allows for the use of soft-assertions. It is included before
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// the standard <assert.h> and these declarations will take precedence.
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//
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// These declarations exist because the system declarations may have
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// __attribute__((noreturn)) and our only modification here is to remove
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// that. Alternative definitions to the standard library also exist in
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// ircd/assert.cc
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#pragma once
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#define HAVE_IRCD_ASSERT_H
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/// This file has to be included prior to the standard library assert headers
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#if defined(RB_ASSERT) && defined(_ASSERT_H_DECLS) && defined(RB_DEBUG)
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#error "Do not include <assert.h> or <cassert> first."
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#endif
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/// Define an indicator for whether we override standard assert() behavior in
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/// this build if the conditions are appropriate.
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#if defined(RB_ASSERT) && !defined(NDEBUG)
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#define _ASSERT_H_DECLS
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#endif
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// Our utils
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namespace ircd
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{
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void debugtrap() noexcept;
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template<class expr> void always_assert(expr&&) noexcept;
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void print_assertion(const char *const &, const char *const &, const unsigned &, const char *const &) noexcept;
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}
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/// Override the standard assert behavior to take one of several different
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/// actions as defined in our internal assert.cc unit. When trapping assert
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/// is disabled this path will be used instead.
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///
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#if defined(RB_ASSERT) && !defined(RB_ASSERT_INTRINSIC)
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extern "C" void
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__attribute__((visibility("default")))
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__assert_fail(const char *__assertion,
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const char *__file,
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unsigned int __line,
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const char *__function);
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#endif
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/// Override the standard assert behavior, if enabled, to trap into the
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/// debugger as close as possible to the offending site.
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///
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#if defined(RB_ASSERT) && defined(RB_ASSERT_INTRINSIC)
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extern "C" // for clang
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{
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extern inline void
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__attribute__((flatten, always_inline, gnu_inline, artificial))
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__assert_fail(const char *__assertion,
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const char *__file,
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unsigned int __line,
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const char *__function)
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{
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ircd::print_assertion(__assertion, __file, __line, __function);
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ircd::debugtrap();
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}
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}
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#endif
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/// Intrinsic to halt execution for examination by a tracing debugger without
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/// aborting the program.
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///
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extern inline void
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__attribute__((always_inline, gnu_inline, artificial))
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ircd::debugtrap()
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noexcept
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{
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#if defined(__clang__)
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static_assert(__has_builtin(__builtin_debugtrap));
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__builtin_debugtrap();
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#elif defined(__x86_64__)
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__asm__ volatile ("int $3 # IRCd ASSERTION DEBUG TRAP !!! ");
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#else
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__builtin_trap();
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#endif
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}
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/// Trap on false expression whether or not NDEBUG.
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template<class expr>
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extern inline void
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__attribute__((always_inline, gnu_inline, artificial))
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ircd::always_assert(expr&& x)
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noexcept
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{
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if(__builtin_expect(!bool(x), 0))
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debugtrap();
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}
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