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https://sourceware.org/git/binutils-gdb.git
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63a4b10683
This copies in libbacktrace from the gcc repository as it was in the commit 62e420293a293608f383d9b9c7f2debd666e9fc9. GDB is going to start using this library soon. A dependency between GDB and libbacktrace has already been added to the top level Makefile, so, after this commit, when building GDB, libbacktrace will be built first. However, libbacktrace is not yet linked into GDB, or used by GDB in any way. It is possible to stop libbacktrace being built by configuring the tree with --disable-libbacktrace. This commit does NOT update src-release.sh, that will be done in the next commit, this commit ONLY imports libbacktrace from gcc. This means that if you try to make a release of GDB from exactly this commit then the release tar file will not include libbacktrace. However, as libbacktrace is an optional dependency this is fine.
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/* backtrace.c -- Entry point for stack backtrace library.
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Copyright (C) 2012-2021 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 <sys/types.h>
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#include "unwind.h"
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#include "backtrace.h"
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#include "internal.h"
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/* The main backtrace_full routine. */
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/* Data passed through _Unwind_Backtrace. */
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struct backtrace_data
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{
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/* Number of frames to skip. */
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int skip;
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/* Library state. */
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struct backtrace_state *state;
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/* Callback routine. */
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backtrace_full_callback callback;
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/* Error callback routine. */
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backtrace_error_callback error_callback;
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/* Data to pass to callback routines. */
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void *data;
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/* Value to return from backtrace_full. */
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int ret;
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/* Whether there is any memory available. */
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int can_alloc;
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};
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/* Unwind library callback routine. This is passed to
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_Unwind_Backtrace. */
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static _Unwind_Reason_Code
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unwind (struct _Unwind_Context *context, void *vdata)
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{
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struct backtrace_data *bdata = (struct backtrace_data *) vdata;
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uintptr_t pc;
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int ip_before_insn = 0;
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#ifdef HAVE_GETIPINFO
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pc = _Unwind_GetIPInfo (context, &ip_before_insn);
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#else
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pc = _Unwind_GetIP (context);
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#endif
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if (bdata->skip > 0)
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{
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--bdata->skip;
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return _URC_NO_REASON;
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}
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if (!ip_before_insn)
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--pc;
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if (!bdata->can_alloc)
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bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
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else
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bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
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bdata->error_callback, bdata->data);
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if (bdata->ret != 0)
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return _URC_END_OF_STACK;
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return _URC_NO_REASON;
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}
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/* Get a stack backtrace. */
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int __attribute__((noinline))
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backtrace_full (struct backtrace_state *state, int skip,
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backtrace_full_callback callback,
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backtrace_error_callback error_callback, void *data)
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{
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struct backtrace_data bdata;
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void *p;
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bdata.skip = skip + 1;
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bdata.state = state;
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bdata.callback = callback;
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bdata.error_callback = error_callback;
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bdata.data = data;
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bdata.ret = 0;
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/* If we can't allocate any memory at all, don't try to produce
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file/line information. */
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p = backtrace_alloc (state, 4096, NULL, NULL);
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if (p == NULL)
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bdata.can_alloc = 0;
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else
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{
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backtrace_free (state, p, 4096, NULL, NULL);
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bdata.can_alloc = 1;
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}
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_Unwind_Backtrace (unwind, &bdata);
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return bdata.ret;
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}
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