gcc/libgfortran/runtime/error.c

486 lines
9.1 KiB
C

/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
Contributed by Andy Vaught
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfor 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 2, or (at your option)
any later version.
Libgfor 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.
You should have received a copy of the GNU General Public License
along with libgfor; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <float.h>
#include "libgfortran.h"
#include "../io/io.h"
/* Error conditions. The tricky part here is printing a message when
* it is the I/O subsystem that is severely wounded. Our goal is to
* try and print something making the fewest assumptions possible,
* then try to clean up before actually exiting.
*
* The following exit conditions are defined:
* 0 Normal program exit.
* 1 Terminated because of operating system error.
* 2 Error in the runtime library
* 3 Internal error in runtime library
* 4 Error during error processing (very bad)
*
* Other error returns are reserved for the STOP statement with a numeric code.
*/
/* locus variables. These are optionally set by a caller before a
* library subroutine is called. They are always cleared on exit so
* that files that report loci and those that do not can be linked
* together without reporting an erroneous position. */
char *filename;
unsigned line;
static char buffer[32]; /* buffer for integer/ascii conversions */
/* Returns a pointer to a static buffer. */
char *
itoa (int64_t n)
{
int negative;
char *p;
uint64_t t;
if (n == 0)
{
buffer[0] = '0';
buffer[1] = '\0';
return buffer;
}
negative = 0;
t = n;
if (n < 0)
{
negative = 1;
t = -n; /*must use unsigned to protect from overflow*/
}
p = buffer + sizeof (buffer) - 1;
*p-- = '\0';
while (t != 0)
{
*p-- = '0' + (t % 10);
t /= 10;
}
if (negative)
*p-- = '-';
return ++p;
}
/* xtoa()-- Integer to hexadecimal conversion. Returns a pointer to a
* static buffer. */
char *
xtoa (uint64_t n)
{
int digit;
char *p;
if (n == 0)
{
buffer[0] = '0';
buffer[1] = '\0';
return buffer;
}
p = buffer + sizeof (buffer) - 1;
*p-- = '\0';
while (n != 0)
{
digit = n & 0xF;
if (digit > 9)
digit += 'A' - '0' - 10;
*p-- = '0' + digit;
n >>= 4;
}
return ++p;
}
/* st_printf()-- simple printf() function for streams that handles the
* formats %d, %s and %c. This function handles printing of error
* messages that originate within the library itself, not from a user
* program. */
int
st_printf (const char *format, ...)
{
int count, total;
va_list arg;
char *p, *q;
stream *s;
total = 0;
s = init_error_stream ();
va_start (arg, format);
for (;;)
{
count = 0;
while (format[count] != '%' && format[count] != '\0')
count++;
if (count != 0)
{
p = salloc_w (s, &count);
memmove (p, format, count);
sfree (s);
}
total += count;
format += count;
if (*format++ == '\0')
break;
switch (*format)
{
case 'c':
count = 1;
p = salloc_w (s, &count);
*p = (char) va_arg (arg, int);
sfree (s);
break;
case 'd':
q = itoa (va_arg (arg, int));
count = strlen (q);
p = salloc_w (s, &count);
memmove (p, q, count);
sfree (s);
break;
case 'x':
q = xtoa (va_arg (arg, unsigned));
count = strlen (q);
p = salloc_w (s, &count);
memmove (p, q, count);
sfree (s);
break;
case 's':
q = va_arg (arg, char *);
count = strlen (q);
p = salloc_w (s, &count);
memmove (p, q, count);
sfree (s);
break;
case '\0':
return total;
default:
count = 2;
p = salloc_w (s, &count);
p[0] = format[-1];
p[1] = format[0];
sfree (s);
break;
}
total += count;
format++;
}
va_end (arg);
return total;
}
/* st_sprintf()-- Simple sprintf() for formatting memory buffers. */
void
st_sprintf (char *buffer, const char *format, ...)
{
va_list arg;
char c, *p;
int count;
va_start (arg, format);
for (;;)
{
c = *format++;
if (c != '%')
{
*buffer++ = c;
if (c == '\0')
break;
continue;
}
c = *format++;
switch (c)
{
case 'c':
*buffer++ = (char) va_arg (arg, int);
break;
case 'd':
p = itoa (va_arg (arg, int));
count = strlen (p);
memcpy (buffer, p, count);
buffer += count;
break;
case 's':
p = va_arg (arg, char *);
count = strlen (p);
memcpy (buffer, p, count);
buffer += count;
break;
default:
*buffer++ = c;
}
}
va_end (arg);
}
/* show_locus()-- Print a line number and filename describing where
* something went wrong */
void
show_locus (void)
{
if (!options.locus || filename == NULL)
return;
st_printf ("At line %d of file %s\n", line, filename);
}
/* recursion_check()-- It's possible for additional errors to occur
* during fatal error processing. We detect this condition here and
* exit with code 4 immediately. */
#define MAGIC 0x20DE8101
static void
recursion_check (void)
{
static int magic = 0;
if (magic == MAGIC)
sys_exit (4); /* Don't even try to print something at this point */
magic = MAGIC;
}
/* os_error()-- Operating system error. We get a message from the
* operating system, show it and leave. Some operating system errors
* are caught and processed by the library. If not, we come here. */
void
os_error (const char *message)
{
recursion_check ();
show_locus ();
st_printf ("Operating system error: %s\n%s\n", get_oserror (), message);
sys_exit (1);
}
/* void runtime_error()-- These are errors associated with an
* invalid fortran program. */
void
runtime_error (const char *message)
{
recursion_check ();
show_locus ();
st_printf ("Fortran runtime error: %s\n", message);
sys_exit (2);
}
/* void internal_error()-- These are this-can't-happen errors
* that indicate something deeply wrong. */
void
internal_error (const char *message)
{
recursion_check ();
show_locus ();
st_printf ("Internal Error: %s\n", message);
sys_exit (3);
}
/* translate_error()-- Given an integer error code, return a string
* describing the error. */
const char *
translate_error (int code)
{
const char *p;
switch (code)
{
case ERROR_EOR:
p = "End of record";
break;
case ERROR_END:
p = "End of file";
break;
case ERROR_OK:
p = "Successful return";
break;
case ERROR_OS:
p = "Operating system error";
break;
case ERROR_BAD_OPTION:
p = "Bad statement option";
break;
case ERROR_MISSING_OPTION:
p = "Missing statement option";
break;
case ERROR_OPTION_CONFLICT:
p = "Conflicting statement options";
break;
case ERROR_ALREADY_OPEN:
p = "File already opened in another unit";
break;
case ERROR_BAD_UNIT:
p = "Unattached unit";
break;
case ERROR_FORMAT:
p = "FORMAT error";
break;
case ERROR_BAD_ACTION:
p = "Incorrect ACTION specified";
break;
case ERROR_ENDFILE:
p = "Read past ENDFILE record";
break;
case ERROR_BAD_US:
p = "Corrupt unformatted sequential file";
break;
case ERROR_READ_VALUE:
p = "Bad value during read";
break;
case ERROR_READ_OVERFLOW:
p = "Numeric overflow on read";
break;
default:
p = "Unknown error code";
break;
}
return p;
}
/* generate_error()-- Come here when an error happens. This
* subroutine is called if it is possible to continue on after the
* error. If an IOSTAT variable exists, we set it. If the IOSTAT or
* ERR label is present, we return, otherwise we terminate the program
* after print a message. The error code is always required but the
* message parameter can be NULL, in which case a string describing
* the most recent operating system error is used. */
void
generate_error (int family, const char *message)
{
/* Set the error status. */
if (ioparm.iostat != NULL)
*ioparm.iostat = family;
/* Report status back to the compiler. */
switch (family)
{
case ERROR_EOR:
ioparm.library_return = LIBRARY_EOR;
if (ioparm.eor != 0)
return;
break;
case ERROR_END:
ioparm.library_return = LIBRARY_END;
if (ioparm.end != 0)
return;
break;
default:
ioparm.library_return = LIBRARY_ERROR;
if (ioparm.err != 0)
return;
break;
}
/* Return if the user supplied an iostat variable. */
if (ioparm.iostat != NULL)
return;
/* Terminate the program */
if (message == NULL)
message =
(family == ERROR_OS) ? get_oserror () : translate_error (family);
runtime_error (message);
}