679 lines
14 KiB
C
679 lines
14 KiB
C
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/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
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Contributed by Andy Vaught
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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Libgfor is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Libgfor is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with libgfor; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "libgfortran.h"
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#include "../io/io.h"
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/* Environment scanner. Examine the environment for controlling minor
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* aspects of the program's execution. Our philosophy here that the
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* environment should not prevent the program from running, so an
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* environment variable with a messed-up value will be interpreted in
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* the default way.
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*
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* Most of the environment is checked early in the startup sequence,
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* but other variables are checked during execution of the user's
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* program. */
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options_t options;
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extern char **environ;
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typedef struct variable
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{
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const char *name;
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int value, *var;
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void (*init) (struct variable *);
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void (*show) (struct variable *);
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const char *desc;
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int bad;
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}
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variable;
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/* print_spaces()-- Print a particular number of spaces */
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static void
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print_spaces (int n)
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{
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char buffer[80];
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int i;
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if (n <= 0)
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return;
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for (i = 0; i < n; i++)
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buffer[i] = ' ';
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buffer[i] = '\0';
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st_printf (buffer);
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}
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/* var_source()-- Return a string that describes where the value of a
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* variable comes from */
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static const char *
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var_source (variable * v)
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{
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if (getenv (v->name) == NULL)
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return "Default";
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if (v->bad)
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return "Bad ";
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return "Set ";
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}
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/* init_integer()-- Initialize an integer environment variable */
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static void
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init_integer (variable * v)
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{
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char *p, *q;
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p = getenv (v->name);
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if (p == NULL)
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goto set_default;
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for (q = p; *q; q++)
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if (!isdigit (*q))
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{
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v->bad = 1;
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goto set_default;
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}
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*v->var = atoi (p);
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return;
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set_default:
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*v->var = v->value;
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return;
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}
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/* show_integer()-- Show an integer environment variable */
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static void
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show_integer (variable * v)
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{
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st_printf ("%s %d\n", var_source (v), *v->var);
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}
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/* init_boolean()-- Initialize a boolean environment variable. We
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* only look at the first letter of the variable. */
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static void
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init_boolean (variable * v)
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{
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char *p;
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p = getenv (v->name);
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if (p == NULL)
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goto set_default;
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if (*p == '1' || *p == 'Y' || *p == 'y')
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{
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*v->var = 1;
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return;
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}
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if (*p == '0' || *p == 'N' || *p == 'n')
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{
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*v->var = 0;
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return;
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}
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v->bad = 1;
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set_default:
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*v->var = v->value;
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return;
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}
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/* show_boolean()-- Show a boolean environment variable */
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static void
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show_boolean (variable * v)
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{
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st_printf ("%s %s\n", var_source (v), *v->var ? "Yes" : "No");
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}
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/* init_mem()-- Initialize environment variables that have to do with
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* how memory from an ALLOCATE statement is filled. A single flag
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* enables filling and a second variable gives the value that is used
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* to initialize the memory. */
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static void
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init_mem (variable * v)
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{
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int offset, n;
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char *p;
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p = getenv (v->name);
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options.allocate_init_flag = 0; /* The default */
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if (p == NULL)
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return;
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if (strcasecmp (p, "NONE") == 0)
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return;
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/* IEEE-754 Quiet Not-a-Number that will work for single and double
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* precision. Look for the 'f95' mantissa in debug dumps. */
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if (strcasecmp (p, "NaN") == 0)
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{
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options.allocate_init_flag = 1;
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options.allocate_init_value = 0xfff80f95;
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return;
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}
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/* Interpret the string as a hexadecimal constant */
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n = 0;
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while (*p)
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{
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if (!isxdigit (*p))
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{
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v->bad = 1;
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return;
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}
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offset = '0';
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if (islower (*p))
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offset = 'a';
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if (isupper (*p))
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offset = 'A';
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n = (n << 4) | (*p++ - offset);
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}
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options.allocate_init_flag = 1;
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options.allocate_init_value = n;
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}
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static void
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show_mem (variable * v)
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{
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char *p;
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p = getenv (v->name);
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st_printf ("%s ", var_source (v));
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if (options.allocate_init_flag)
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st_printf ("0x%x", options.allocate_init_value);
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st_printf ("\n");
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}
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static void
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init_sep (variable * v)
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{
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int seen_comma;
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char *p;
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p = getenv (v->name);
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if (p == NULL)
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goto set_default;
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v->bad = 1;
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options.separator = p;
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options.separator_len = strlen (p);
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/* Make sure the separator is valid */
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if (options.separator_len == 0)
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goto set_default;
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seen_comma = 0;
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while (*p)
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{
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if (*p == ',')
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{
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if (seen_comma)
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goto set_default;
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seen_comma = 1;
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p++;
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continue;
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}
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if (*p++ != ' ')
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goto set_default;
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}
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v->bad = 0;
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return;
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set_default:
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options.separator = " ";
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options.separator_len = 1;
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}
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static void
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show_sep (variable * v)
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{
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st_printf ("%s \"%s\"\n", var_source (v), options.separator);
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}
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static void
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init_string (variable * v)
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{
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}
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static void
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show_string (variable * v)
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{
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const char *p;
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p = getenv (v->name);
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if (p == NULL)
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p = "";
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st_printf ("%s \"%s\"\n", var_source (v), p);
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}
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/* Structure for associating names and values. */
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typedef struct
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{
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const char *name;
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int value;
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}
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choice;
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enum
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{ FP_ROUND_NEAREST, FP_ROUND_UP, FP_ROUND_DOWN, FP_ROUND_ZERO };
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static choice rounding[] = {
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{"NEAREST", FP_ROUND_NEAREST},
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{"UP", FP_ROUND_UP},
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{"DOWN", FP_ROUND_DOWN},
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{"ZERO", FP_ROUND_ZERO},
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{NULL}
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}, precision[] =
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{
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{
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"24", 1}
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,
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{
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"53", 2}
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,
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{
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"64", 0}
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,
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{
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NULL}
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}
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, signal_choices[] =
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{
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{
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"IGNORE", 1}
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,
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{
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"ABORT", 0}
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,
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{
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NULL}
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};
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static void
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init_choice (variable * v, choice * c)
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{
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char *p;
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p = getenv (v->name);
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if (p == NULL)
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goto set_default;
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for (; c->name; c++)
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if (strcasecmp (c->name, p) == 0)
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break;
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if (c->name == NULL)
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{
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v->bad = 1;
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goto set_default;
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}
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*v->var = c->value;
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return;
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set_default:
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*v->var = v->value;
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}
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static void
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show_choice (variable * v, choice * c)
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{
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st_printf ("%s ", var_source (v));
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for (; c->name; c++)
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if (c->value == *v->var)
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break;
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if (c->name)
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st_printf ("%s\n", c->name);
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else
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st_printf ("(Unknown)\n");
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}
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static void
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init_round (variable * v)
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{
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init_choice (v, rounding);
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}
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static void
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show_round (variable * v)
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{
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show_choice (v, rounding);
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}
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static void
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init_precision (variable * v)
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{
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init_choice (v, precision);
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}
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static void
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show_precision (variable * v)
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{
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show_choice (v, precision);
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}
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static void
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init_signal (variable * v)
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{
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init_choice (v, signal_choices);
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}
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static void
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show_signal (variable * v)
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{
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show_choice (v, signal_choices);
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}
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static variable variable_table[] = {
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{"GFORTRAN_STDIN_UNIT", 5, &options.stdin_unit, init_integer, show_integer,
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"Unit number that will be preconnected to standard input\n"
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"(No preconnection if negative)"},
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{"GFORTRAN_STDOUT_UNIT", 6, &options.stdout_unit, init_integer,
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show_integer,
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"Unit number that will be preconnected to standard output\n"
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"(No preconnection if negative)"},
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{"GFORTRAN_USE_STDERR", 1, &options.use_stderr, init_boolean,
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show_boolean,
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"Sends library output to standard error instead of standard output."},
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{"GFORTRAN_TMPDIR", 0, NULL, init_string, show_string,
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"Directory for scratch files. Overrides the TMP environment variable\n"
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"If TMP is not set " DEFAULT_TEMPDIR " is used."},
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{"GFORTRAN_UNBUFFERED_ALL", 0, &options.all_unbuffered, init_boolean,
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show_boolean,
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"If TRUE, all output is unbuffered. This will slow down large writes "
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"but can be\nuseful for forcing data to be displayed immediately."},
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{"GFORTRAN_SHOW_LOCUS", 1, &options.locus, init_boolean, show_boolean,
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"If TRUE, print filename and line number where runtime errors happen."},
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/* GFORTRAN_NAME_xx (where xx is a unit number) gives the names of files
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* preconnected to those units. */
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/* GFORTRAN_UNBUFFERED_xx (where xx is a unit number) gives a boolean that is used
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* to turn off buffering for that unit. */
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{"GFORTRAN_OPTIONAL_PLUS", 0, &options.optional_plus, init_boolean, show_boolean,
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"Print optional plus signs in numbers where permitted. Default FALSE."},
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{"GFORTRAN_DEFAULT_RECL", DEFAULT_RECL, &options.default_recl,
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init_integer, show_integer,
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"Default maximum record length for sequential files. Most useful for\n"
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"adjusting line length of preconnected units. Default "
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stringize (DEFAULT_RECL)},
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{"GFORTRAN_LIST_SEPARATOR", 0, NULL, init_sep, show_sep,
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"Separatator to use when writing list output. May contain any number of "
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"spaces\nand at most one comma. Default is a single space."},
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/* Memory related controls */
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{"GFORTRAN_MEM_INIT", 0, NULL, init_mem, show_mem,
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"How to initialize allocated memory. Default value is NONE for no "
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"initialization\n(faster), NAN for a Not-a-Number with the mantissa "
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"0x40f95 or a custom\nhexadecimal value"},
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{"GFORTRAN_MEM_CHECK", 0, &options.mem_check, init_boolean, show_boolean,
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"Whether memory still allocated will be reported when the program ends."},
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/* Signal handling (Unix). */
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{"GFORTRAN_SIGHUP", 0, &options.sighup, init_signal, show_signal,
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"Whether the program will IGNORE or ABORT on SIGHUP."},
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{"GFORTRAN_SIGINT", 0, &options.sigint, init_signal, show_signal,
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"Whether the program will IGNORE or ABORT on SIGINT."},
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/* Floating point control */
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{"GFORTRAN_FPU_ROUND", 0, &options.fpu_round, init_round, show_round,
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"Set floating point rounding. Values are NEAREST, UP, DOWN, ZERO."},
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{"GFORTRAN_FPU_PRECISION", 0, &options.fpu_precision, init_precision,
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show_precision,
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||
|
"Precision of intermediate results. Values are 24, 53 and 64."},
|
||
|
|
||
|
{"GFORTRAN_FPU_INVALID", 1, &options.fpu_invalid, init_boolean,
|
||
|
show_boolean,
|
||
|
"Raise a floating point exception on invalid FP operation."},
|
||
|
|
||
|
{"GFORTRAN_FPU_DENORMAL", 1, &options.fpu_denormal, init_boolean,
|
||
|
show_boolean,
|
||
|
"Raise a floating point exception when denormal numbers are encountered."},
|
||
|
|
||
|
{"GFORTRAN_FPU_ZERO", 0, &options.fpu_zerodiv, init_boolean, show_boolean,
|
||
|
"Raise a floating point exception when dividing by zero."},
|
||
|
|
||
|
{"GFORTRAN_FPU_OVERFLOW", 0, &options.fpu_overflow, init_boolean,
|
||
|
show_boolean,
|
||
|
"Raise a floating point exception on overflow."},
|
||
|
|
||
|
{"GFORTRAN_FPU_UNDERFLOW", 0, &options.fpu_underflow, init_boolean,
|
||
|
show_boolean,
|
||
|
"Raise a floating point exception on underflow."},
|
||
|
|
||
|
{"GFORTRAN_FPU_PRECISION", 0, &options.fpu_precision_loss, init_boolean,
|
||
|
show_boolean,
|
||
|
"Raise a floating point exception on precision loss."},
|
||
|
|
||
|
{NULL}
|
||
|
};
|
||
|
|
||
|
|
||
|
/* init_variables()-- Initialize most runtime variables from
|
||
|
* environment variables. */
|
||
|
|
||
|
void
|
||
|
init_variables (void)
|
||
|
{
|
||
|
variable *v;
|
||
|
|
||
|
for (v = variable_table; v->name; v++)
|
||
|
v->init (v);
|
||
|
}
|
||
|
|
||
|
|
||
|
/* check_buffered()-- Given an unit number n, determine if an override
|
||
|
* for the stream exists. Returns zero for unbuffered, one for
|
||
|
* buffered or two for not set. */
|
||
|
|
||
|
int
|
||
|
check_buffered (int n)
|
||
|
{
|
||
|
char name[40];
|
||
|
variable v;
|
||
|
int rv;
|
||
|
|
||
|
if (options.all_unbuffered)
|
||
|
return 0;
|
||
|
|
||
|
strcpy (name, "GFORTRAN_UNBUFFERED_");
|
||
|
strcat (name, itoa (n));
|
||
|
|
||
|
v.name = name;
|
||
|
v.value = 2;
|
||
|
v.var = &rv;
|
||
|
|
||
|
init_boolean (&v);
|
||
|
|
||
|
return rv;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* pattern_scan()-- Given an environment string, check that the name
|
||
|
* has the same name as the pattern followed by an integer. On a
|
||
|
* match, a pointer to the value is returned and the integer pointed
|
||
|
* to by n is updated. Returns NULL on no match. */
|
||
|
|
||
|
static char *
|
||
|
pattern_scan (char *env, const char *pattern, int *n)
|
||
|
{
|
||
|
char *p;
|
||
|
size_t len;
|
||
|
|
||
|
len = strlen (pattern);
|
||
|
if (strncasecmp (env, pattern, len) != 0)
|
||
|
return NULL;
|
||
|
p = env + len;
|
||
|
|
||
|
if (!isdigit (*p))
|
||
|
return NULL;
|
||
|
|
||
|
while (isdigit (*p))
|
||
|
p++;
|
||
|
|
||
|
if (*p != '=')
|
||
|
return NULL;
|
||
|
|
||
|
*p = '\0';
|
||
|
*n = atoi (env + len);
|
||
|
*p++ = '=';
|
||
|
|
||
|
return p;
|
||
|
}
|
||
|
|
||
|
|
||
|
void
|
||
|
show_variables (void)
|
||
|
{
|
||
|
char *p, **e;
|
||
|
variable *v;
|
||
|
int n;
|
||
|
/* TODO: print version number. */
|
||
|
st_printf ("GNU Fortran 95 runtime library version "
|
||
|
"UNKNOWN" "\n\n");
|
||
|
|
||
|
st_printf ("Environment variables:\n");
|
||
|
st_printf ("----------------------\n");
|
||
|
|
||
|
for (v = variable_table; v->name; v++)
|
||
|
{
|
||
|
n = st_printf ("%s", v->name);
|
||
|
print_spaces (25 - n);
|
||
|
|
||
|
if (v->show == show_integer)
|
||
|
st_printf ("Integer ");
|
||
|
else if (v->show == show_boolean)
|
||
|
st_printf ("Boolean ");
|
||
|
else
|
||
|
st_printf ("String ");
|
||
|
|
||
|
v->show (v);
|
||
|
st_printf ("%s\n\n", v->desc);
|
||
|
}
|
||
|
|
||
|
st_printf ("\nDefault unit names (GFORTRAN_NAME_x):\n");
|
||
|
|
||
|
for (e = environ; *e; e++)
|
||
|
{
|
||
|
p = pattern_scan (*e, "GFORTRAN_NAME_", &n);
|
||
|
if (p == NULL)
|
||
|
continue;
|
||
|
st_printf ("GFORTRAN_NAME_%d %s\n", n, p);
|
||
|
}
|
||
|
|
||
|
st_printf ("\nUnit buffering overrides (GFORTRAN_UNBUFFERED_x):\n");
|
||
|
for (e = environ; *e; e++)
|
||
|
{
|
||
|
p = pattern_scan (*e, "GFORTRAN_UNBUFFERED_", &n);
|
||
|
if (p == NULL)
|
||
|
continue;
|
||
|
|
||
|
st_printf ("GFORTRAN_UNBUFFERED_%d = %s\n", n, p);
|
||
|
}
|
||
|
|
||
|
/* System error codes */
|
||
|
|
||
|
st_printf ("\nRuntime error codes:");
|
||
|
st_printf ("\n--------------------\n");
|
||
|
|
||
|
for (n = ERROR_FIRST + 1; n < ERROR_LAST; n++)
|
||
|
if (n < 0 || n > 9)
|
||
|
st_printf ("%d %s\n", n, translate_error (n));
|
||
|
else
|
||
|
st_printf (" %d %s\n", n, translate_error (n));
|
||
|
|
||
|
st_printf ("\nCommand line arguments:\n");
|
||
|
st_printf (" --help Print this list\n");
|
||
|
|
||
|
/* st_printf(" --resume <dropfile> Resume program execution from dropfile\n"); */
|
||
|
|
||
|
sys_exit (0);
|
||
|
}
|