diff options
Diffstat (limited to 'gcc-4.8/libbacktrace/fileline.c')
| -rw-r--r-- | gcc-4.8/libbacktrace/fileline.c | 208 |
1 files changed, 0 insertions, 208 deletions
diff --git a/gcc-4.8/libbacktrace/fileline.c b/gcc-4.8/libbacktrace/fileline.c deleted file mode 100644 index e5c39be8e..000000000 --- a/gcc-4.8/libbacktrace/fileline.c +++ /dev/null @@ -1,208 +0,0 @@ -/* fileline.c -- Get file and line number information in a backtrace. - Copyright (C) 2012-2013 Free Software Foundation, Inc. - Written by Ian Lance Taylor, Google. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are -met: - - (1) Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - (2) Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in - the documentation and/or other materials provided with the - distribution. - - (3) The name of the author may not be used to - endorse or promote products derived from this software without - specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR -IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, -INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR -SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, -STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING -IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -POSSIBILITY OF SUCH DAMAGE. */ - -#include "config.h" - -#include <sys/types.h> -#include <sys/stat.h> -#include <errno.h> -#include <fcntl.h> -#include <stdlib.h> - -#include "backtrace.h" -#include "internal.h" - -#ifndef HAVE_GETEXECNAME -#define getexecname() NULL -#endif - -/* Initialize the fileline information from the executable. Returns 1 - on success, 0 on failure. */ - -static int -fileline_initialize (struct backtrace_state *state, - backtrace_error_callback error_callback, void *data) -{ - int failed; - fileline fileline_fn; - int pass; - int called_error_callback; - int descriptor; - - failed = state->fileline_initialization_failed; - - if (state->threaded) - { - /* Use __sync_bool_compare_and_swap to do an atomic load. */ - while (!__sync_bool_compare_and_swap - (&state->fileline_initialization_failed, failed, failed)) - failed = state->fileline_initialization_failed; - } - - if (failed) - { - error_callback (data, "failed to read executable information", -1); - return 0; - } - - fileline_fn = state->fileline_fn; - if (state->threaded) - { - while (!__sync_bool_compare_and_swap (&state->fileline_fn, fileline_fn, - fileline_fn)) - fileline_fn = state->fileline_fn; - } - if (fileline_fn != NULL) - return 1; - - /* We have not initialized the information. Do it now. */ - - descriptor = -1; - called_error_callback = 0; - for (pass = 0; pass < 4; ++pass) - { - const char *filename; - int does_not_exist; - - switch (pass) - { - case 0: - filename = state->filename; - break; - case 1: - filename = getexecname (); - break; - case 2: - filename = "/proc/self/exe"; - break; - case 3: - filename = "/proc/curproc/file"; - break; - default: - abort (); - } - - if (filename == NULL) - continue; - - descriptor = backtrace_open (filename, error_callback, data, - &does_not_exist); - if (descriptor < 0 && !does_not_exist) - { - called_error_callback = 1; - break; - } - if (descriptor >= 0) - break; - } - - if (descriptor < 0) - { - if (!called_error_callback) - { - if (state->filename != NULL) - error_callback (data, state->filename, ENOENT); - else - error_callback (data, - "libbacktrace could not find executable to open", - 0); - } - failed = 1; - } - - if (!failed) - { - if (!backtrace_initialize (state, descriptor, error_callback, data, - &fileline_fn)) - failed = 1; - } - - if (failed) - { - if (!state->threaded) - state->fileline_initialization_failed = 1; - else - __sync_bool_compare_and_swap (&state->fileline_initialization_failed, - 0, failed); - return 0; - } - - if (!state->threaded) - state->fileline_fn = fileline_fn; - else - { - __sync_bool_compare_and_swap (&state->fileline_fn, NULL, fileline_fn); - - /* At this point we know that state->fileline_fn is not NULL. - Either we stored our value, or some other thread stored its - value. If some other thread stored its value, we leak the - one we just initialized. Either way, state->fileline_fn is - initialized. The compare_and_swap is a full memory barrier, - so we should have full access to that value even if it was - created by another thread. */ - } - - return 1; -} - -/* Given a PC, find the file name, line number, and function name. */ - -int -backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc, - backtrace_full_callback callback, - backtrace_error_callback error_callback, void *data) -{ - if (!fileline_initialize (state, error_callback, data)) - return 0; - - if (state->fileline_initialization_failed) - return 0; - - return state->fileline_fn (state, pc, callback, error_callback, data); -} - -/* Given a PC, find the symbol for it, and its value. */ - -int -backtrace_syminfo (struct backtrace_state *state, uintptr_t pc, - backtrace_syminfo_callback callback, - backtrace_error_callback error_callback, void *data) -{ - if (!fileline_initialize (state, error_callback, data)) - return 0; - - if (state->fileline_initialization_failed) - return 0; - - state->syminfo_fn (state, pc, callback, error_callback, data); - return 1; -} |