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t_backtrace.c revision 1.11 
      1 /*	$NetBSD: t_backtrace.c,v 1.11 2014/01/11 19:13:41 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: t_backtrace.c,v 1.11 2014/01/11 19:13:41 martin Exp $");
     33 
     34 #include <atf-c.h>
     35 #include <atf-c/config.h>
     36 #include <string.h>
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <execinfo.h>
     40 #include <unistd.h>
     41 
     42 #ifndef __arraycount
     43 #define __arraycount(a) (sizeof(a) / sizeof(a[0]))
     44 #endif
     45 
     46 void myfunc3(size_t ncalls);
     47 void myfunc2(size_t ncalls);
     48 void myfunc1(size_t origcalls, volatile size_t ncalls);
     49 void myfunc(size_t ncalls);
     50 
     51 volatile int prevent_inline;
     52 
     53 void
     54 myfunc3(size_t ncalls)
     55 {
     56 	static const char *top[] = { "myfunc", "atfu_backtrace_fmt_basic_body",
     57 	    "atf_tc_run", "atf_tp_run", "atf_tp_main", "main", "___start" };
     58 	static bool optional_frame[] = { false, false, false, true, false,
     59 	    false, true };
     60 	size_t j, nptrs, min_frames, max_frames;
     61 	void *buffer[ncalls + 10];
     62 	char **strings;
     63 	__CTASSERT(__arraycount(top) == __arraycount(optional_frame));
     64 
     65 	min_frames = 0;
     66 	max_frames = 0;
     67 	for (j = 0; j < __arraycount(optional_frame); ++j) {
     68 		if (!optional_frame[j])
     69 			++min_frames;
     70 		++max_frames;
     71 	}
     72 	nptrs = backtrace(buffer, __arraycount(buffer));
     73 	strings = backtrace_symbols_fmt(buffer, nptrs, "%n");
     74 
     75 	ATF_CHECK(strings != NULL);
     76 
     77 	printf("got nptrs=%zu ncalls=%zu (min_frames: %zu, max_frames: %zu)\n",
     78 	    nptrs, ncalls, min_frames, max_frames);
     79 	printf("backtrace is:\n");
     80 	for (j = 0; j < nptrs; j++) {
     81 		printf("#%zu: %s\n", j, strings[j]);
     82 	}
     83 
     84 	ATF_REQUIRE(nptrs >= ncalls + 2 + min_frames);
     85 	ATF_REQUIRE(nptrs <= ncalls + 2 + max_frames);
     86 	ATF_CHECK_STREQ(strings[0], "myfunc3");
     87 	ATF_CHECK_STREQ(strings[1], "myfunc2");
     88 
     89 	for (j = 2; j < ncalls + 2; j++)
     90 		ATF_CHECK_STREQ(strings[j], "myfunc1");
     91 
     92 	for (size_t i = 0; j < nptrs; i++, j++) {
     93 		if (optional_frame[i] && strcmp(strings[j], top[i])) {
     94 			--i;
     95 			continue;
     96 		}
     97 		ATF_CHECK_STREQ(strings[j], top[i]);
     98 	}
     99 
    100 	free(strings);
    101 
    102 	if (prevent_inline)
    103 		vfork();
    104 }
    105 
    106 void
    107 myfunc2(size_t ncalls)
    108 {
    109 	myfunc3(ncalls);
    110 
    111 	if (prevent_inline)
    112 		vfork();
    113 }
    114 
    115 void
    116 myfunc1(size_t origcalls, volatile size_t ncalls)
    117 {
    118 	if (ncalls > 1)
    119 		myfunc1(origcalls, ncalls - 1);
    120 	else
    121 		myfunc2(origcalls);
    122 
    123 	if (prevent_inline)
    124 		vfork();
    125 }
    126 
    127 void
    128 myfunc(size_t ncalls)
    129 {
    130 	myfunc1(ncalls, ncalls);
    131 
    132 	if (prevent_inline)
    133 		vfork();
    134 }
    135 
    136 ATF_TC(backtrace_fmt_basic);
    137 ATF_TC_HEAD(backtrace_fmt_basic, tc)
    138 {
    139         atf_tc_set_md_var(tc, "descr", "Test backtrace_fmt(3)");
    140 }
    141 
    142 ATF_TC_BODY(backtrace_fmt_basic, tc)
    143 {
    144 	myfunc(12);
    145 
    146 	if (prevent_inline)
    147 		vfork();
    148 }
    149 
    150 ATF_TP_ADD_TCS(tp)
    151 {
    152 
    153 	ATF_TP_ADD_TC(tp, backtrace_fmt_basic);
    154 
    155 	return atf_no_error();
    156 }
    157