89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* Return backtrace of current program state.
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Copyright (C) 2003-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <execinfo.h>
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#include <stdlib.h>
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#include <unwind.h>
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#include <unwind-link.h>
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struct trace_arg
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{
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void **array;
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struct unwind_link *unwind_link;
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_Unwind_Word cfa;
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int cnt;
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int size;
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};
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static _Unwind_Reason_Code
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backtrace_helper (struct _Unwind_Context *ctx, void *a)
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{
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struct trace_arg *arg = a;
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/* We are first called with address in the __backtrace function.
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Skip it. */
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if (arg->cnt != -1)
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{
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arg->array[arg->cnt]
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= (void *) UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetIP) (ctx);
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if (arg->cnt > 0)
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arg->array[arg->cnt]
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= unwind_arch_adjustment (arg->array[arg->cnt - 1],
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arg->array[arg->cnt]);
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/* Check whether we make any progress. */
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_Unwind_Word cfa
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= UNWIND_LINK_PTR (arg->unwind_link, _Unwind_GetCFA) (ctx);
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if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt]
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&& cfa == arg->cfa)
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return _URC_END_OF_STACK;
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arg->cfa = cfa;
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}
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if (++arg->cnt == arg->size)
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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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int
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__backtrace (void **array, int size)
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{
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struct trace_arg arg =
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{
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.array = array,
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.unwind_link = __libc_unwind_link_get (),
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.cfa = 0,
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.size = size,
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.cnt = -1
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};
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if (size <= 0 || arg.unwind_link == NULL)
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return 0;
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UNWIND_LINK_PTR (arg.unwind_link, _Unwind_Backtrace)
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(backtrace_helper, &arg);
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/* _Unwind_Backtrace seems to put NULL address above
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_start. Fix it up here. */
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if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
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--arg.cnt;
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return arg.cnt != -1 ? arg.cnt : 0;
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}
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weak_alias (__backtrace, backtrace)
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libc_hidden_def (__backtrace)
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