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64dd77361f
The previous method, using zassert.h and hoping nothing includes assert.h (which, on glibc at least, just does "#undef assert" and puts its own definition in...) was fragile - and actually broke undetected. Just provide our own assert.h and control overriding by putting it in a separate directory to add to the include path (or not.) Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*
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* Copyright (c) 2021 David Lamparter, for NetDEF, Inc.
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*
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* Permission to use, copy, modify, and 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 appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* WARNING: this file is "special" in that it overrides the system-provided
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* assert.h by being on the include path before it. That means it should
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* provide the functional equivalent.
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*
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* This is intentional because FRR extends assert() to write to the log and
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* add backtraces. Overriding the entire file is the simplest and most
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* reliable way to get this to work; there were problems previously with the
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* system assert.h getting included afterwards and redefining assert() back to
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* the system variant.
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*/
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#ifndef _FRR_ASSERT_H
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#define _FRR_ASSERT_H
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#include "xref.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __cplusplus
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/* C++ has this built-in, but C provides it in assert.h for >=C11. Since we
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* replace assert.h entirely, we need to provide it here too.
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*/
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#define static_assert _Static_assert
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#endif
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struct xref_assert {
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struct xref xref;
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const char *expr;
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const char *extra, *args;
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};
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extern void _zlog_assert_failed(const struct xref_assert *xref,
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const char *extra, ...) PRINTFRR(2, 3)
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__attribute__((noreturn));
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/* the "do { } while (expr_)" is there to get a warning for assignments inside
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* the assert expression aka "assert(x = 1)". The (necessary) braces around
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* expr_ in the if () statement would suppress these warnings. Since
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* _zlog_assert_failed() is noreturn, the while condition will never be
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* checked.
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*/
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#define assert(expr_) \
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({ \
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static const struct xref_assert _xref __attribute__( \
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(used)) = { \
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.xref = XREF_INIT(XREFT_ASSERT, NULL, __func__), \
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.expr = #expr_, \
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}; \
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XREF_LINK(_xref.xref); \
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if (__builtin_expect((expr_) ? 0 : 1, 0)) \
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do { \
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_zlog_assert_failed(&_xref, NULL); \
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} while (expr_); \
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})
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#define assertf(expr_, extra_, ...) \
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({ \
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static const struct xref_assert _xref __attribute__( \
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(used)) = { \
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.xref = XREF_INIT(XREFT_ASSERT, NULL, __func__), \
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.expr = #expr_, \
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.extra = extra_, \
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.args = #__VA_ARGS__, \
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}; \
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XREF_LINK(_xref.xref); \
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if (__builtin_expect((expr_) ? 0 : 1, 0)) \
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do { \
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_zlog_assert_failed(&_xref, extra_, \
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##__VA_ARGS__); \
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} while (expr_); \
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})
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#define zassert assert
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FRR_ASSERT_H */
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