mirror of
https://gitlab.isc.org/isc-projects/bind9
synced 2025-08-24 11:08:45 +00:00
584f0d7a7e
Previously, the unreachable code paths would have to be tagged with:
INSIST(0);
ISC_UNREACHABLE();
There was also older parts of the code that used comment annotation:
/* NOTREACHED */
Unify the handling of unreachable code paths to just use:
UNREACHABLE();
The UNREACHABLE() macro now asserts when reached and also uses
__builtin_unreachable(); when such builtin is available in the compiler.
112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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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 https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <stdio.h>
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#include <stdlib.h>
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#include <isc/assertions.h>
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#include <isc/backtrace.h>
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#include <isc/print.h>
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#include <isc/result.h>
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#include <isc/strerr.h>
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/*
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* The maximum number of stack frames to dump on assertion failure.
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*/
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#ifndef BACKTRACE_MAXFRAME
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#define BACKTRACE_MAXFRAME 128
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#endif /* ifndef BACKTRACE_MAXFRAME */
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/*%
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* Forward.
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*/
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static void
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default_callback(const char *, int, isc_assertiontype_t, const char *);
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static isc_assertioncallback_t isc_assertion_failed_cb = default_callback;
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/*%
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* Public.
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*/
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/*% assertion failed handler */
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/* coverity[+kill] */
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void
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isc_assertion_failed(const char *file, int line, isc_assertiontype_t type,
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const char *cond) {
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isc_assertion_failed_cb(file, line, type, cond);
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abort();
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}
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/*% Set callback. */
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void
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isc_assertion_setcallback(isc_assertioncallback_t cb) {
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if (cb == NULL) {
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isc_assertion_failed_cb = default_callback;
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} else {
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isc_assertion_failed_cb = cb;
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}
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}
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/*% Type to Text */
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const char *
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isc_assertion_typetotext(isc_assertiontype_t type) {
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const char *result;
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/*
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* These strings have purposefully not been internationalized
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* because they are considered to essentially be keywords of
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* the ISC development environment.
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*/
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switch (type) {
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case isc_assertiontype_require:
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result = "REQUIRE";
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break;
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case isc_assertiontype_ensure:
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result = "ENSURE";
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break;
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case isc_assertiontype_insist:
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result = "INSIST";
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break;
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case isc_assertiontype_invariant:
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result = "INVARIANT";
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break;
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default:
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result = "UNKNOWN";
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}
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return (result);
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}
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/*
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* Private.
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*/
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static void
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default_callback(const char *file, int line, isc_assertiontype_t type,
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const char *cond) {
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void *tracebuf[BACKTRACE_MAXFRAME];
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int nframes = isc_backtrace(tracebuf, BACKTRACE_MAXFRAME);
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fprintf(stderr, "%s:%d: %s(%s) failed%s\n", file, line,
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isc_assertion_typetotext(type), cond,
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(nframes > 0) ? ", back trace" : ".");
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if (nframes > 0) {
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isc_backtrace_symbols_fd(tracebuf, nframes, fileno(stderr));
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}
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fflush(stderr);
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}
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