1 /* Copyright (C) 2002-2003, 2005, 2007, 2009, 2011
2 Free Software Foundation, Inc.
3 Contributed by Andy Vaught and Paul Brook <paul@nowt.org>
5 This file is part of the GNU Fortran runtime library (libgfortran).
7 Libgfortran is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 Libgfortran is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
26 #include "libgfortran.h"
36 /* Stupid function to be sure the constructor is always linked in, even
37 in the case of static linking. See PR libfortran/22298 for details. */
39 stupid_function_name_for_static_linking (void)
44 /* This will be 0 for little-endian
45 machines and 1 for big-endian machines. */
49 /* Figure out endianness for this machine. */
52 determine_endianness (void)
66 runtime_error ("Unable to determine machine endianness");
71 static char **argv_save;
73 static const char *exe_path;
74 static int please_free_exe_path_when_done;
76 /* Save the path under which the program was called, for use in the
77 backtrace routines. */
79 store_exe_path (const char * argv0)
86 #define DIR_SEPARATOR '/'
89 char buf[PATH_MAX], *path;
92 /* This can only happen if store_exe_path is called multiple times. */
93 if (please_free_exe_path_when_done)
94 free ((char *) exe_path);
96 /* Reading the /proc/self/exe symlink is Linux-specific(?), but if
97 it works it gives the correct answer. */
100 if ((len = readlink ("/proc/self/exe", buf, sizeof (buf) - 1)) != -1)
103 exe_path = strdup (buf);
104 please_free_exe_path_when_done = 1;
109 /* If the path is absolute or on a simulator where argv is not set. */
112 || ('A' <= argv0[0] && argv0[0] <= 'Z' && argv0[1] == ':')
113 || ('a' <= argv0[0] && argv0[0] <= 'z' && argv0[1] == ':')
114 || (argv0[0] == '/' && argv0[1] == '/')
115 || (argv0[0] == '\\' && argv0[1] == '\\'))
117 if (argv0 == NULL || argv0[0] == DIR_SEPARATOR)
121 please_free_exe_path_when_done = 0;
126 cwd = getcwd (buf, sizeof (buf));
134 please_free_exe_path_when_done = 0;
138 /* exe_path will be cwd + "/" + argv[0] + "\0". This will not work
139 if the executable is not in the cwd, but at this point we're out
141 size_t pathlen = strlen (cwd) + 1 + strlen (argv0) + 1;
142 path = malloc (pathlen);
143 snprintf (path, pathlen, "%s%c%s", cwd, DIR_SEPARATOR, argv0);
145 please_free_exe_path_when_done = 1;
149 /* Return the full path of the executable. */
153 return (char *) exe_path;
157 char *addr2line_path;
159 /* Find addr2line and store the path. */
162 find_addr2line (void)
166 char *path = getenv ("PATH");
169 size_t n = strlen (path);
170 char ap[n + 1 + A2L_LEN];
172 for (size_t i = 0; i < n; i++)
179 memcpy (ap + ai, "addr2line", A2L_LEN);
180 if (access (ap, R_OK|X_OK) == 0)
182 addr2line_path = strdup (ap);
193 /* Set the saved values of the command line arguments. */
196 set_args (int argc, char **argv)
200 store_exe_path (argv[0]);
205 /* Retrieve the saved values of the command line arguments. */
208 get_args (int *argc, char ***argv)
215 /* Initialize the runtime library. */
217 static void __attribute__((constructor))
220 /* Figure out the machine endianness. */
221 determine_endianness ();
228 init_compile_options ();
231 /* Check for special command lines. */
233 if (argc > 1 && strcmp (argv[1], "--help") == 0)
236 /* if (argc > 1 && strcmp(argv[1], "--resume") == 0) resume(); */
239 if (options.backtrace == 1)
242 random_seed_i4 (NULL, NULL, NULL);
246 /* Cleanup the runtime library. */
248 static void __attribute__((destructor))
253 if (please_free_exe_path_when_done)
254 free ((char *) exe_path);
256 free (addr2line_path);