156 lines
4.7 KiB
C
156 lines
4.7 KiB
C
/* fileline.c -- Get file and line number information in a backtrace.
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Copyright (C) 2012 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 <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include "backtrace.h"
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#include "internal.h"
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/* Initialize the fileline information from the executable. Returns 1
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on success, 0 on failure. */
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static int
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fileline_initialize (struct backtrace_state *state,
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backtrace_error_callback error_callback, void *data)
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{
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int failed;
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fileline fileline_fn;
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int descriptor;
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failed = state->fileline_initialization_failed;
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if (state->threaded)
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{
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/* Use __sync_bool_compare_and_swap to do an atomic load. */
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while (!__sync_bool_compare_and_swap
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(&state->fileline_initialization_failed, failed, failed))
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failed = state->fileline_initialization_failed;
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}
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if (failed)
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{
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error_callback (data, "failed to read executable information", -1);
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return 0;
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}
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fileline_fn = state->fileline_fn;
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if (state->threaded)
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{
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while (!__sync_bool_compare_and_swap (&state->fileline_fn, fileline_fn,
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fileline_fn))
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fileline_fn = state->fileline_fn;
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}
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if (fileline_fn != NULL)
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return 1;
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/* We have not initialized the information. Do it now. */
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if (state->filename != NULL)
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descriptor = backtrace_open (state->filename, error_callback, data, NULL);
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else
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descriptor = backtrace_open ("/proc/self/exe", error_callback, data, NULL);
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if (descriptor < 0)
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failed = 1;
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if (!failed)
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{
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if (!backtrace_initialize (state, descriptor, error_callback, data,
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&fileline_fn))
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failed = 1;
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}
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if (failed)
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{
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if (!state->threaded)
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state->fileline_initialization_failed = 1;
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else
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__sync_bool_compare_and_swap (&state->fileline_initialization_failed,
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0, failed);
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return 0;
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}
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if (!state->threaded)
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state->fileline_fn = fileline_fn;
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else
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{
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__sync_bool_compare_and_swap (&state->fileline_fn, NULL, fileline_fn);
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/* At this point we know that state->fileline_fn is not NULL.
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Either we stored our value, or some other thread stored its
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value. If some other thread stored its value, we leak the
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one we just initialized. Either way, state->fileline_fn is
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initialized. The compare_and_swap is a full memory barrier,
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so we should have full access to that value even if it was
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created by another thread. */
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}
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return 1;
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}
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/* Given a PC, find the file name, line number, and function name. */
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int
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backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc,
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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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if (!fileline_initialize (state, error_callback, data))
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return 0;
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if (state->fileline_initialization_failed)
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return 0;
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return state->fileline_fn (state, pc, callback, error_callback, data);
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}
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/* Given a PC, find the symbol for it, and its value. */
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int
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backtrace_syminfo (struct backtrace_state *state, uintptr_t pc,
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backtrace_syminfo_callback callback,
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backtrace_error_callback error_callback, void *data)
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{
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if (!fileline_initialize (state, error_callback, data))
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return 0;
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if (state->fileline_initialization_failed)
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return 0;
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state->syminfo_fn (state, pc, callback, error_callback, data);
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return 1;
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}
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