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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) 2012-2019 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 <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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