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https://gitlab.torproject.org/tpo/core/tor.git
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9bbd6502f0
This gives more accurate results under Clang, which can only help us detect more warnings in more places. Fixes bug 19216; bugfix on 0.2.0.1-alpha
133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/* Copyright (c) 2012-2016, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "orconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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/* To prevent 'assert' from going away. */
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#undef TOR_COVERAGE
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#include "or.h"
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#include "util.h"
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#include "backtrace.h"
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#include "torlog.h"
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/* -1: no crash.
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* 0: crash with a segmentation fault.
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* 1x: crash with an assertion failure. */
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static int crashtype = 0;
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#ifdef __GNUC__
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#define NOINLINE __attribute__((noinline))
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#define NORETURN __attribute__((noreturn))
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#endif
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int crash(int x) NOINLINE;
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int oh_what(int x) NOINLINE;
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int a_tangled_web(int x) NOINLINE;
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int we_weave(int x) NOINLINE;
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static void abort_handler(int s) NORETURN;
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#ifdef HAVE_CFLAG_WNULL_DEREFERENCE
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DISABLE_GCC_WARNING(null-dereference)
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#endif
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int
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crash(int x)
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{
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if (crashtype == 0) {
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#if defined(__clang_analyzer__) || defined(__COVERITY__)
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tor_assert(1 == 0); /* Avert your eyes, clangalyzer and coverity! You
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* don't need to see us dereference NULL. */
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#else
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*(volatile int *)0 = 0;
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#endif
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} else if (crashtype == 1) {
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tor_assert(1 == 0);
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} else if (crashtype == -1) {
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;
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}
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crashtype *= x;
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return crashtype;
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}
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#ifdef HAVE_CFLAG_WNULL_DEREFERENCE
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ENABLE_GCC_WARNING(null-dereference)
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#endif
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int
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oh_what(int x)
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{
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/* We call crash() twice here, so that the compiler won't try to do a
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* tail-call optimization. Only the first call will actually happen, but
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* telling the compiler to maybe do the second call will prevent it from
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* replacing the first call with a jump. */
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return crash(x) + crash(x*2);
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}
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int
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a_tangled_web(int x)
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{
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return oh_what(x) * 99 + oh_what(x);
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}
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int
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we_weave(int x)
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{
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return a_tangled_web(x) + a_tangled_web(x+1);
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}
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static void
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abort_handler(int s)
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{
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(void)s;
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exit(0);
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}
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int
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main(int argc, char **argv)
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{
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log_severity_list_t severity;
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if (argc < 2) {
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puts("I take an argument. It should be \"assert\" or \"crash\" or "
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"\"backtraces\" or \"none\"");
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return 1;
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}
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#if !(defined(HAVE_EXECINFO_H) && defined(HAVE_BACKTRACE) && \
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defined(HAVE_BACKTRACE_SYMBOLS_FD) && defined(HAVE_SIGACTION))
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puts("Backtrace reporting is not supported on this platform");
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return 77;
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#endif
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if (!strcmp(argv[1], "assert")) {
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crashtype = 1;
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} else if (!strcmp(argv[1], "crash")) {
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crashtype = 0;
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} else if (!strcmp(argv[1], "none")) {
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crashtype = -1;
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} else if (!strcmp(argv[1], "backtraces")) {
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return 0;
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} else {
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puts("Argument should be \"assert\" or \"crash\" or \"none\"");
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return 1;
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}
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init_logging(1);
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set_log_severity_config(LOG_WARN, LOG_ERR, &severity);
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add_stream_log(&severity, "stdout", STDOUT_FILENO);
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tor_log_update_sigsafe_err_fds();
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configure_backtrace_handler(NULL);
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signal(SIGABRT, abort_handler);
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printf("%d\n", we_weave(2));
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clean_up_backtrace_handler();
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logs_free_all();
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return 0;
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}
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