560 lines
12 KiB
C
560 lines
12 KiB
C
/* Copyright (C) 2002, 2003, 2005, 2006 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 (libgfortran).
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Libgfortran 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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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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Libgfortran 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 libgfortran; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <float.h>
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#include <errno.h>
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#include "libgfortran.h"
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#include "../io/io.h"
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#include "../io/unix.h"
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/* Error conditions. The tricky part here is printing a message when
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* it is the I/O subsystem that is severely wounded. Our goal is to
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* try and print something making the fewest assumptions possible,
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* then try to clean up before actually exiting.
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*
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* The following exit conditions are defined:
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* 0 Normal program exit.
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* 1 Terminated because of operating system error.
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* 2 Error in the runtime library
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* 3 Internal error in runtime library
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* 4 Error during error processing (very bad)
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*
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* Other error returns are reserved for the STOP statement with a numeric code.
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*/
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/* gfc_itoa()-- Integer to decimal conversion. */
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const char *
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gfc_itoa (GFC_INTEGER_LARGEST n, char *buffer, size_t len)
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{
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int negative;
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char *p;
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GFC_UINTEGER_LARGEST t;
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assert (len >= GFC_ITOA_BUF_SIZE);
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if (n == 0)
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return "0";
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negative = 0;
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t = n;
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if (n < 0)
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{
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negative = 1;
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t = -n; /*must use unsigned to protect from overflow*/
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}
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p = buffer + GFC_ITOA_BUF_SIZE - 1;
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*p = '\0';
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while (t != 0)
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{
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*--p = '0' + (t % 10);
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t /= 10;
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}
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if (negative)
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*--p = '-';
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return p;
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}
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/* xtoa()-- Integer to hexadecimal conversion. */
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const char *
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xtoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len)
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{
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int digit;
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char *p;
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assert (len >= GFC_XTOA_BUF_SIZE);
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if (n == 0)
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return "0";
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p = buffer + GFC_XTOA_BUF_SIZE - 1;
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*p = '\0';
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while (n != 0)
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{
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digit = n & 0xF;
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if (digit > 9)
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digit += 'A' - '0' - 10;
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*--p = '0' + digit;
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n >>= 4;
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}
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return p;
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}
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/* st_printf()-- simple printf() function for streams that handles the
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* formats %d, %s and %c. This function handles printing of error
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* messages that originate within the library itself, not from a user
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* program. */
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int
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st_printf (const char *format, ...)
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{
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int count, total;
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va_list arg;
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char *p;
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const char *q;
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stream *s;
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char itoa_buf[GFC_ITOA_BUF_SIZE];
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unix_stream err_stream;
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total = 0;
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s = init_error_stream (&err_stream);
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va_start (arg, format);
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for (;;)
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{
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count = 0;
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while (format[count] != '%' && format[count] != '\0')
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count++;
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if (count != 0)
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{
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p = salloc_w (s, &count);
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memmove (p, format, count);
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sfree (s);
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}
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total += count;
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format += count;
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if (*format++ == '\0')
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break;
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switch (*format)
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{
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case 'c':
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count = 1;
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p = salloc_w (s, &count);
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*p = (char) va_arg (arg, int);
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sfree (s);
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break;
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case 'd':
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q = gfc_itoa (va_arg (arg, int), itoa_buf, sizeof (itoa_buf));
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case 'x':
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q = xtoa (va_arg (arg, unsigned), itoa_buf, sizeof (itoa_buf));
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case 's':
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q = va_arg (arg, char *);
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count = strlen (q);
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p = salloc_w (s, &count);
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memmove (p, q, count);
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sfree (s);
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break;
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case '\0':
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return total;
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default:
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count = 2;
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p = salloc_w (s, &count);
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p[0] = format[-1];
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p[1] = format[0];
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sfree (s);
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break;
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}
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total += count;
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format++;
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}
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va_end (arg);
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return total;
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}
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/* st_sprintf()-- Simple sprintf() for formatting memory buffers. */
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void
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st_sprintf (char *buffer, const char *format, ...)
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{
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va_list arg;
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char c;
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const char *p;
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int count;
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char itoa_buf[GFC_ITOA_BUF_SIZE];
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va_start (arg, format);
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for (;;)
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{
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c = *format++;
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if (c != '%')
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{
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*buffer++ = c;
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if (c == '\0')
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break;
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continue;
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}
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c = *format++;
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switch (c)
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{
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case 'c':
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*buffer++ = (char) va_arg (arg, int);
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break;
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case 'd':
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p = gfc_itoa (va_arg (arg, int), itoa_buf, sizeof (itoa_buf));
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count = strlen (p);
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memcpy (buffer, p, count);
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buffer += count;
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break;
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case 's':
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p = va_arg (arg, char *);
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count = strlen (p);
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memcpy (buffer, p, count);
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buffer += count;
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break;
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default:
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*buffer++ = c;
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}
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}
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va_end (arg);
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}
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/* show_locus()-- Print a line number and filename describing where
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* something went wrong */
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void
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show_locus (st_parameter_common *cmp)
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{
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if (!options.locus || cmp == NULL || cmp->filename == NULL)
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return;
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st_printf ("At line %d of file %s\n", (int) cmp->line, cmp->filename);
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}
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/* recursion_check()-- It's possible for additional errors to occur
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* during fatal error processing. We detect this condition here and
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* exit with code 4 immediately. */
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#define MAGIC 0x20DE8101
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static void
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recursion_check (void)
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{
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static int magic = 0;
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/* Don't even try to print something at this point */
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if (magic == MAGIC)
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sys_exit (4);
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magic = MAGIC;
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}
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/* os_error()-- Operating system error. We get a message from the
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* operating system, show it and leave. Some operating system errors
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* are caught and processed by the library. If not, we come here. */
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void
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os_error (const char *message)
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{
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recursion_check ();
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st_printf ("Operating system error: %s\n%s\n", get_oserror (), message);
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sys_exit (1);
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}
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/* void runtime_error()-- These are errors associated with an
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* invalid fortran program. */
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void
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runtime_error (const char *message)
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{
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recursion_check ();
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st_printf ("Fortran runtime error: %s\n", message);
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sys_exit (2);
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}
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iexport(runtime_error);
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/* void internal_error()-- These are this-can't-happen errors
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* that indicate something deeply wrong. */
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void
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internal_error (st_parameter_common *cmp, const char *message)
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{
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recursion_check ();
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show_locus (cmp);
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st_printf ("Internal Error: %s\n", message);
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/* This function call is here to get the main.o object file included
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when linking statically. This works because error.o is supposed to
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be always linked in (and the function call is in internal_error
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because hopefully it doesn't happen too often). */
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stupid_function_name_for_static_linking();
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sys_exit (3);
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}
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/* translate_error()-- Given an integer error code, return a string
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* describing the error. */
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const char *
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translate_error (int code)
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{
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const char *p;
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switch (code)
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{
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case ERROR_EOR:
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p = "End of record";
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break;
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case ERROR_END:
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p = "End of file";
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break;
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case ERROR_OK:
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p = "Successful return";
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break;
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case ERROR_OS:
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p = "Operating system error";
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break;
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case ERROR_BAD_OPTION:
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p = "Bad statement option";
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break;
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case ERROR_MISSING_OPTION:
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p = "Missing statement option";
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break;
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case ERROR_OPTION_CONFLICT:
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p = "Conflicting statement options";
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break;
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case ERROR_ALREADY_OPEN:
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p = "File already opened in another unit";
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break;
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case ERROR_BAD_UNIT:
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p = "Unattached unit";
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break;
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case ERROR_FORMAT:
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p = "FORMAT error";
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break;
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case ERROR_BAD_ACTION:
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p = "Incorrect ACTION specified";
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break;
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case ERROR_ENDFILE:
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p = "Read past ENDFILE record";
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break;
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case ERROR_BAD_US:
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p = "Corrupt unformatted sequential file";
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break;
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case ERROR_READ_VALUE:
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p = "Bad value during read";
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break;
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case ERROR_READ_OVERFLOW:
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p = "Numeric overflow on read";
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break;
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case ERROR_INTERNAL:
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p = "Internal error in run-time library";
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break;
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case ERROR_INTERNAL_UNIT:
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p = "Internal unit I/O error";
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break;
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case ERROR_DIRECT_EOR:
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p = "Write exceeds length of DIRECT access record";
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break;
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case ERROR_SHORT_RECORD:
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p = "Short record on unformatted read";
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break;
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default:
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p = "Unknown error code";
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break;
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}
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return p;
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}
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/* generate_error()-- Come here when an error happens. This
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* subroutine is called if it is possible to continue on after the error.
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* If an IOSTAT or IOMSG variable exists, we set it. If IOSTAT or
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* ERR labels are present, we return, otherwise we terminate the program
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* after printing a message. The error code is always required but the
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* message parameter can be NULL, in which case a string describing
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* the most recent operating system error is used. */
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void
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generate_error (st_parameter_common *cmp, int family, const char *message)
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{
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/* Set the error status. */
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if ((cmp->flags & IOPARM_HAS_IOSTAT))
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*cmp->iostat = (family == ERROR_OS) ? errno : family;
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if (message == NULL)
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message =
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(family == ERROR_OS) ? get_oserror () : translate_error (family);
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if (cmp->flags & IOPARM_HAS_IOMSG)
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cf_strcpy (cmp->iomsg, cmp->iomsg_len, message);
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/* Report status back to the compiler. */
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cmp->flags &= ~IOPARM_LIBRETURN_MASK;
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switch (family)
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{
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case ERROR_EOR:
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cmp->flags |= IOPARM_LIBRETURN_EOR;
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if ((cmp->flags & IOPARM_EOR))
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return;
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break;
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case ERROR_END:
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cmp->flags |= IOPARM_LIBRETURN_END;
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if ((cmp->flags & IOPARM_END))
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return;
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break;
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default:
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cmp->flags |= IOPARM_LIBRETURN_ERROR;
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if ((cmp->flags & IOPARM_ERR))
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return;
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break;
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}
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/* Return if the user supplied an iostat variable. */
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if ((cmp->flags & IOPARM_HAS_IOSTAT))
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return;
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/* Terminate the program */
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recursion_check ();
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show_locus (cmp);
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st_printf ("Fortran runtime error: %s\n", message);
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sys_exit (2);
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}
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/* Whether, for a feature included in a given standard set (GFC_STD_*),
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we should issue an error or a warning, or be quiet. */
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notification
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notification_std (int std)
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{
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int warning;
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if (!compile_options.pedantic)
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return SILENT;
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warning = compile_options.warn_std & std;
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if ((compile_options.allow_std & std) != 0 && !warning)
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return SILENT;
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return warning ? WARNING : ERROR;
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}
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/* Possibly issue a warning/error about use of a nonstandard (or deleted)
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feature. An error/warning will be issued if the currently selected
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standard does not contain the requested bits. */
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try
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notify_std (st_parameter_common *cmp, int std, const char * message)
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{
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int warning;
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if (!compile_options.pedantic)
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return SUCCESS;
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warning = compile_options.warn_std & std;
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if ((compile_options.allow_std & std) != 0 && !warning)
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return SUCCESS;
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if (!warning)
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{
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recursion_check ();
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show_locus (cmp);
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st_printf ("Fortran runtime error: %s\n", message);
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sys_exit (2);
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}
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else
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{
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show_locus (cmp);
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st_printf ("Fortran runtime warning: %s\n", message);
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}
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return FAILURE;
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}
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