/* Copyright (C) 2002-2015 Free Software Foundation, Inc. Contributed by Andy Vaught and Paul Brook This file is part of the GNU Fortran runtime library (libgfortran). Libgfortran is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgfortran is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see . */ #include "libgfortran.h" #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif /* Stupid function to be sure the constructor is always linked in, even in the case of static linking. See PR libfortran/22298 for details. */ void stupid_function_name_for_static_linking (void) { return; } /* This will be 0 for little-endian machines and 1 for big-endian machines. */ int big_endian = 0; /* Figure out endianness for this machine. */ static void determine_endianness (void) { union { GFC_LOGICAL_8 l8; GFC_LOGICAL_4 l4[2]; } u; u.l8 = 1; if (u.l4[0]) big_endian = 0; else if (u.l4[1]) big_endian = 1; else runtime_error ("Unable to determine machine endianness"); } static int argc_save; static char **argv_save; static const char *exe_path; static bool please_free_exe_path_when_done; /* Save the path under which the program was called, for use in the backtrace routines. */ void store_exe_path (const char * argv0) { #ifndef DIR_SEPARATOR #define DIR_SEPARATOR '/' #endif char *cwd, *path; /* This can only happen if store_exe_path is called multiple times. */ if (please_free_exe_path_when_done) free ((char *) exe_path); /* Reading the /proc/self/exe symlink is Linux-specific(?), but if it works it gives the correct answer. */ #ifdef HAVE_READLINK ssize_t len, psize = 256; while (1) { path = xmalloc (psize); len = readlink ("/proc/self/exe", path, psize); if (len < 0) { free (path); break; } else if (len < psize) { path[len] = '\0'; exe_path = strdup (path); free (path); please_free_exe_path_when_done = true; return; } /* The remaining option is len == psize. */ free (path); psize *= 4; } #endif /* If the path is absolute or on a simulator where argv is not set. */ #ifdef __MINGW32__ if (argv0 == NULL || ('A' <= argv0[0] && argv0[0] <= 'Z' && argv0[1] == ':') || ('a' <= argv0[0] && argv0[0] <= 'z' && argv0[1] == ':') || (argv0[0] == '/' && argv0[1] == '/') || (argv0[0] == '\\' && argv0[1] == '\\')) #else if (argv0 == NULL || argv0[0] == DIR_SEPARATOR) #endif { exe_path = argv0; please_free_exe_path_when_done = false; return; } #ifdef HAVE_GETCWD size_t cwdsize = 256; while (1) { cwd = xmalloc (cwdsize); if (getcwd (cwd, cwdsize)) break; else if (errno == ERANGE) { free (cwd); cwdsize *= 4; } else { free (cwd); cwd = NULL; break; } } #else cwd = NULL; #endif if (!cwd) { exe_path = argv0; please_free_exe_path_when_done = false; return; } /* exe_path will be cwd + "/" + argv[0] + "\0". This will not work if the executable is not in the cwd, but at this point we're out of better ideas. */ size_t pathlen = strlen (cwd) + 1 + strlen (argv0) + 1; path = xmalloc (pathlen); snprintf (path, pathlen, "%s%c%s", cwd, DIR_SEPARATOR, argv0); free (cwd); exe_path = path; please_free_exe_path_when_done = true; } /* Return the full path of the executable. */ char * full_exe_path (void) { return (char *) exe_path; } #ifndef HAVE_STRTOK_R static char* gfstrtok_r (char *str, const char *delim, char **saveptr __attribute__ ((unused))) { return strtok (str, delim); } #define strtok_r gfstrtok_r #endif char *addr2line_path; /* Find addr2line and store the path. */ void find_addr2line (void) { #ifdef HAVE_ACCESS #define A2L_LEN 11 char *path = secure_getenv ("PATH"); if (!path) return; char *tp = strdup (path); if (!tp) return; size_t n = strlen (path); char *ap = xmalloc (n + A2L_LEN); char *saveptr; for (char *str = tp;; str = NULL) { char *token = strtok_r (str, ":", &saveptr); if (!token) break; size_t toklen = strlen (token); memcpy (ap, token, toklen); memcpy (ap + toklen, "/addr2line", A2L_LEN); if (access (ap, R_OK|X_OK) == 0) { addr2line_path = strdup (ap); break; } } free (tp); free (ap); #endif } /* Set the saved values of the command line arguments. */ void set_args (int argc, char **argv) { argc_save = argc; argv_save = argv; store_exe_path (argv[0]); } iexport(set_args); /* Retrieve the saved values of the command line arguments. */ void get_args (int *argc, char ***argv) { *argc = argc_save; *argv = argv_save; } /* Initialize the runtime library. */ static void __attribute__((constructor)) init (void) { /* Figure out the machine endianness. */ determine_endianness (); /* Must be first */ init_variables (); init_units (); set_fpu (); init_compile_options (); #ifdef DEBUG /* Check for special command lines. */ if (argc > 1 && strcmp (argv[1], "--help") == 0) show_variables (); /* if (argc > 1 && strcmp(argv[1], "--resume") == 0) resume(); */ #endif if (options.backtrace == 1) find_addr2line (); random_seed_i4 (NULL, NULL, NULL); } /* Cleanup the runtime library. */ static void __attribute__((destructor)) cleanup (void) { close_units (); if (please_free_exe_path_when_done) free ((char *) exe_path); free (addr2line_path); }