Retro68/gcc/libgfortran/runtime/main.c

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/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
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Contributed by Andy Vaught and Paul Brook <paul@nowt.org>
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
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include <stdlib.h>
#include <string.h>
#include <limits.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
#include <unistd.h>
#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;
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static bool please_free_exe_path_when_done;
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/* 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
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char *cwd, *path;
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/* 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
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ssize_t len, psize = 256;
while (1)
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{
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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;
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}
#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;
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please_free_exe_path_when_done = false;
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return;
}
#ifdef HAVE_GETCWD
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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;
}
}
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#else
cwd = NULL;
#endif
if (!cwd)
{
exe_path = argv0;
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please_free_exe_path_when_done = false;
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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;
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path = xmalloc (pathlen);
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snprintf (path, pathlen, "%s%c%s", cwd, DIR_SEPARATOR, argv0);
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free (cwd);
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exe_path = path;
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please_free_exe_path_when_done = true;
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}
/* Return the full path of the executable. */
char *
full_exe_path (void)
{
return (char *) exe_path;
}
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#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
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char *addr2line_path;
/* Find addr2line and store the path. */
void
find_addr2line (void)
{
#ifdef HAVE_ACCESS
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#define A2L_LEN 11
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char *path = secure_getenv ("PATH");
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if (!path)
return;
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char *tp = strdup (path);
if (!tp)
return;
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size_t n = strlen (path);
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char *ap = xmalloc (n + A2L_LEN);
char *saveptr;
for (char *str = tp;; str = NULL)
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{
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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)
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{
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addr2line_path = strdup (ap);
break;
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}
}
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free (tp);
free (ap);
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#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);
}