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The backtrace functions backtrace_full, backtrace_print and backtrace_simple walk the call stack, but make sure to skip the first entry, in order to skip over the functions themselves, and start the backtrace at the caller of the functions. When compiling with -flto, the functions may be inlined, causing them to skip over the caller instead. Fix this by declaring the functions with __attribute__((noinline)). 2019-02-08 Tom de Vries <tdevries@suse.de> * backtrace.c (backtrace_full): Declare with __attribute__((noinline)). * print.c (backtrace_print): Same. * simple.c (backtrace_simple): Same. From-SVN: r268668
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/* print.c -- Print the current backtrace.
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Copyright (C) 2012-2019 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Google.
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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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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include "backtrace.h"
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#include "internal.h"
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/* Passed to callbacks. */
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struct print_data
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{
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struct backtrace_state *state;
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FILE *f;
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};
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/* Print one level of a backtrace. */
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static int
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print_callback (void *data, uintptr_t pc, const char *filename, int lineno,
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const char *function)
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{
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struct print_data *pdata = (struct print_data *) data;
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fprintf (pdata->f, "0x%lx %s\n\t%s:%d\n",
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(unsigned long) pc,
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function == NULL ? "???" : function,
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filename == NULL ? "???" : filename,
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lineno);
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return 0;
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}
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/* Print errors to stderr. */
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static void
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error_callback (void *data, const char *msg, int errnum)
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{
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struct print_data *pdata = (struct print_data *) data;
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if (pdata->state->filename != NULL)
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fprintf (stderr, "%s: ", pdata->state->filename);
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fprintf (stderr, "libbacktrace: %s", msg);
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if (errnum > 0)
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fprintf (stderr, ": %s", strerror (errnum));
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fputc ('\n', stderr);
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}
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/* Print a backtrace. */
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void __attribute__((noinline))
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backtrace_print (struct backtrace_state *state, int skip, FILE *f)
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{
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struct print_data data;
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data.state = state;
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data.f = f;
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backtrace_full (state, skip + 1, print_callback, error_callback,
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(void *) &data);
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}
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