mirror of
https://github.com/ianlancetaylor/libbacktrace.git
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libbacktrace: handle MOREDATA correctly without debug info
Based on patch from Andi Kleen. * elf.c (elf_nodebug): Handle state->moredata. * fileline.c (backtrace_syminfo_to_full_callback): Remove incorrect comment about MOREDATA. (backtrace_syminfo_to_full_callback_moredata): New function. * internal.h (backtrace_syminfo_to_full_callback_moredata): Declare. * strippedtest.c: New file. * configure.ac: check whether objcopy supports --strip-debug. * Makefile.am (strippedtest_SOURCES): New variable. (strippedtest_CFLAGS, strippedtest_LDFLAGS): Likewise. (strippedtest_LDADD): Likewise. (check_PROGRAMS): Add strippedtest. (MAKETESTS): Add strippedtest_stripped (%_stripped): New rule. * configure, Makefile.in: Regenerate.
This commit is contained in:
Ian Lance Taylor
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/* strippedtest.c -- Test for libbacktrace library with no debug info
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Copyright (C) 2026 Free Software Foundation, Inc.
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Written by Ian Lance Taylor.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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(1) Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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(2) Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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(3) The name of the author may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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/* Test libbacktrace when there is no debug info. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "backtrace.h"
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#include "backtrace-supported.h"
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#include "internal.h"
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#include "testlib.h"
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/* Used to collect moredata info from backtraces. */
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struct mdinfo
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{
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int decl_lineno;
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};
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/* We pass a pointer to this as the data field to the backtrace
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functions. */
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struct mddata
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{
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struct bdata bdata;
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struct mdinfo *mdall;
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};
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/* backtrace_full_callback with moredata flag. */
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static int
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md_callback_one (void *vdata, uintptr_t pc, const char *filename, int lineno,
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const char *function)
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{
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struct backtrace_moredata *md = (struct backtrace_moredata *) vdata;
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struct mddata *mddata = (struct mddata *) md->backtrace_data;
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struct bdata *data = &mddata->bdata;
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if (md->backtrace_version != BACKTRACE_MOREDATA_VERSION)
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{
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fprintf (stderr,
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"md_callback_one: wrong moredata version: got %u, want %u\n",
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md->backtrace_version, BACKTRACE_MOREDATA_VERSION);
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data->failed = 1;
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return 1;
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}
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if (data->index < data->max)
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mddata->mdall[data->index].decl_lineno = md->backtrace_decl_lineno;
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return callback_one ((void *) data, pc, filename, lineno, function);
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}
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/* The check function for a stripped executable. */
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static void
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stripped_check (const char *name, int index, const struct info *all,
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const char *want_function, int *failed)
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{
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if (*failed)
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return;
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if (all[index].filename != NULL)
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{
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fprintf (stderr, "%s: [%d]: unexpected file name in stripped program\n",
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name, index);
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*failed = 1;
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}
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if (all[index].function == NULL)
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{
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fprintf (stderr, "%s: [%d]: missing function name\n",
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name, index);
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*failed = 1;
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return;
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}
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if (all[index].lineno != 0)
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{
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fprintf (stderr, "%s: [%d]: got %d expected 0\n", name, index,
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all[index].lineno);
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*failed = 1;
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}
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if (strcmp (all[index].function, want_function) != 0)
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{
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fprintf (stderr, "%s: [%d]: got %s expected %s\n", name, index,
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all[index].function, want_function);
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*failed = 1;
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}
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}
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static int test1 (int) __attribute__ ((noinline, noclone, optnone, unused));
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static int f2 (int, int) __attribute__ ((noinline, noclone));
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static int f3 (int, int, int) __attribute__ ((noinline, noclone));
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static int
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test1 (int mdtest)
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{
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return f2 (mdtest, __LINE__) + 1;
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}
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static int
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f2 (int mdtest, int f1line)
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{
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return f3 (mdtest, f1line, __LINE__) + 2;
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}
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static int
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f3 (int mdtest, int f1line ATTRIBUTE_UNUSED, int f2line ATTRIBUTE_UNUSED)
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{
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struct info all[20];
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struct mdinfo mdall[20];
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struct bdata bdata;
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struct mddata mddata;
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void *data;
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backtrace_full_callback callback;
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int i;
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int failed;
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size_t index;
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bdata.all = &all[0];
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bdata.index = 0;
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bdata.max = 20;
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bdata.failed = 0;
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data = (void *) &bdata;
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callback = callback_one;
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if (mdtest)
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{
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mddata.bdata = bdata;
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mddata.mdall = &mdall[0];
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data = (void *) &mddata;
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callback = md_callback_one;
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}
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i = backtrace_full (state, 0, callback, error_callback_one, data);
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failed = mdtest ? mddata.bdata.failed : bdata.failed;
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if (i != 0)
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{
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fprintf (stderr, "test1: unexpected return value %d\n", i);
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failed = 1;
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}
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index = mdtest ? mddata.bdata.index : bdata.index;
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if (index < 3)
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{
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fprintf (stderr,
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"test1: not enough frames; got %zu, expected at least 3\n",
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index);
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failed = 1;
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}
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stripped_check ("test1", 0, all, "f3", &failed);
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stripped_check ("test1", 1, all, "f2", &failed);
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stripped_check ("test1", 2, all, "test1", &failed);
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printf ("%s: backtrace_full noinline%s\n", failed ? "FAIL" : "PASS",
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mdtest ? " mdtest" : "");
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if (failed)
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++failures;
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return failures;
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}
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int
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main (int argc ATTRIBUTE_UNUSED, char **argv)
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{
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state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS,
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error_callback_create, NULL);
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#if BACKTRACE_SUPPORTED
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test1 (0);
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#endif
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state = backtrace_create_state (argv[0], BACKTRACE_SUPPORTS_THREADS | 2,
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error_callback_create, NULL);
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#if BACKTRACE_SUPPORTED
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test1 (1);
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#endif
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exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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