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/* Deal with I/O statements & related stuff.
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
   Inc.
   Contributed by Andy Vaught
 
This file is part of GCC.
 
GCC 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.
 
GCC 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 GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */
 
#include "config.h"
#include "system.h"
#include "flags.h"
#include "gfortran.h"
#include "match.h"
#include "parse.h"
 
gfc_st_label format_asterisk =
  { -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,
    {NULL, NULL}, NULL, NULL};
 
typedef struct
{
  const char *name, *spec;
  bt type;
}
io_tag;
 
static const io_tag
        tag_file        = { "FILE", " file = %e", BT_CHARACTER },
        tag_status      = { "STATUS", " status = %e", BT_CHARACTER},
        tag_e_access    = {"ACCESS", " access = %e", BT_CHARACTER},
        tag_e_form      = {"FORM", " form = %e", BT_CHARACTER},
        tag_e_recl      = {"RECL", " recl = %e", BT_INTEGER},
        tag_e_blank     = {"BLANK", " blank = %e", BT_CHARACTER},
        tag_e_position  = {"POSITION", " position = %e", BT_CHARACTER},
        tag_e_action    = {"ACTION", " action = %e", BT_CHARACTER},
        tag_e_delim     = {"DELIM", " delim = %e", BT_CHARACTER},
        tag_e_pad       = {"PAD", " pad = %e", BT_CHARACTER},
        tag_unit        = {"UNIT", " unit = %e", BT_INTEGER},
        tag_advance     = {"ADVANCE", " advance = %e", BT_CHARACTER},
        tag_rec         = {"REC", " rec = %e", BT_INTEGER},
        tag_format      = {"FORMAT", NULL, BT_CHARACTER},
        tag_iomsg       = {"IOMSG", " iomsg = %e", BT_CHARACTER},
        tag_iostat      = {"IOSTAT", " iostat = %v", BT_INTEGER},
        tag_size        = {"SIZE", " size = %v", BT_INTEGER},
        tag_exist       = {"EXIST", " exist = %v", BT_LOGICAL},
        tag_opened      = {"OPENED", " opened = %v", BT_LOGICAL},
        tag_named       = {"NAMED", " named = %v", BT_LOGICAL},
        tag_name        = {"NAME", " name = %v", BT_CHARACTER},
        tag_number      = {"NUMBER", " number = %v", BT_INTEGER},
        tag_s_access    = {"ACCESS", " access = %v", BT_CHARACTER},
        tag_sequential  = {"SEQUENTIAL", " sequential = %v", BT_CHARACTER},
        tag_direct      = {"DIRECT", " direct = %v", BT_CHARACTER},
        tag_s_form      = {"FORM", " form = %v", BT_CHARACTER},
        tag_formatted   = {"FORMATTED", " formatted = %v", BT_CHARACTER},
        tag_unformatted = {"UNFORMATTED", " unformatted = %v", BT_CHARACTER},
        tag_s_recl      = {"RECL", " recl = %v", BT_INTEGER},
        tag_nextrec     = {"NEXTREC", " nextrec = %v", BT_INTEGER},
        tag_s_blank     = {"BLANK", " blank = %v", BT_CHARACTER},
        tag_s_position  = {"POSITION", " position = %v", BT_CHARACTER},
        tag_s_action    = {"ACTION", " action = %v", BT_CHARACTER},
        tag_read        = {"READ", " read = %v", BT_CHARACTER},
        tag_write       = {"WRITE", " write = %v", BT_CHARACTER},
        tag_readwrite   = {"READWRITE", " readwrite = %v", BT_CHARACTER},
        tag_s_delim     = {"DELIM", " delim = %v", BT_CHARACTER},
        tag_s_pad       = {"PAD", " pad = %v", BT_CHARACTER},
        tag_iolength    = {"IOLENGTH", " iolength = %v", BT_INTEGER},
        tag_convert     = {"CONVERT", " convert = %e", BT_CHARACTER},
        tag_err         = {"ERR", " err = %l", BT_UNKNOWN},
        tag_end         = {"END", " end = %l", BT_UNKNOWN},
        tag_eor         = {"EOR", " eor = %l", BT_UNKNOWN};
 
static gfc_dt *current_dt;
 
#define RESOLVE_TAG(x, y) if (resolve_tag(x, y) == FAILURE) return FAILURE;
 
 
/**************** Fortran 95 FORMAT parser  *****************/
 
/* FORMAT tokens returned by format_lex().  */
typedef enum
{
  FMT_NONE, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
  FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_POS, FMT_LPAREN,
  FMT_RPAREN, FMT_X, FMT_SIGN, FMT_BLANK, FMT_CHAR, FMT_P, FMT_IBOZ, FMT_F,
  FMT_E, FMT_EXT, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
}
format_token;
 
/* Local variables for checking format strings.  The saved_token is
   used to back up by a single format token during the parsing
   process.  */
static char *format_string;
static int format_length, use_last_char;
 
static format_token saved_token;
 
static enum
{ MODE_STRING, MODE_FORMAT, MODE_COPY }
mode;
 
 
/* Return the next character in the format string.  */
 
static char
next_char (int in_string)
{
  static char c;
 
  if (use_last_char)
    {
      use_last_char = 0;
      return c;
    }
 
  format_length++;
 
  if (mode == MODE_STRING)
    c = *format_string++;
  else
    {
      c = gfc_next_char_literal (in_string);
      if (c == '\n')
        c = '\0';
 
      if (mode == MODE_COPY)
        *format_string++ = c;
    }
 
  c = TOUPPER (c);
  return c;
}
 
 
/* Back up one character position.  Only works once.  */
 
static void
unget_char (void)
{
 
  use_last_char = 1;
}
 
/* Eat up the spaces and return a character. */
 
static char
next_char_not_space(void)
{
  char c;
  do
    {
      c = next_char (0);
    }
  while (gfc_is_whitespace (c));
  return c;
}
 
static int value = 0;
 
/* Simple lexical analyzer for getting the next token in a FORMAT
   statement.  */
 
static format_token
format_lex (void)
{
  format_token token;
  char c, delim;
  int zflag;
  int negative_flag;
 
  if (saved_token != FMT_NONE)
    {
      token = saved_token;
      saved_token = FMT_NONE;
      return token;
    }
 
  c = next_char_not_space ();
 
  negative_flag = 0;
  switch (c)
    {
    case '-':
      negative_flag = 1;
    case '+':
      c = next_char_not_space ();
      if (!ISDIGIT (c))
        {
          token = FMT_UNKNOWN;
          break;
        }
 
      value = c - '0';
 
      do
        {
          c = next_char_not_space ();
          if(ISDIGIT (c))
            value = 10 * value + c - '0';
        }
      while (ISDIGIT (c) || gfc_is_whitespace(c));
 
      unget_char ();
 
      if (negative_flag)
        value = -value;
 
      token = FMT_SIGNED_INT;
      break;
 
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
      zflag = (c == '0');
 
      value = c - '0';
 
      do
        {
          c = next_char_not_space ();
          if (c != '0')
            zflag = 0;
          if (ISDIGIT (c))
            value = 10 * value + c - '0';
        }
      while (ISDIGIT (c));
 
      unget_char ();
      token = zflag ? FMT_ZERO : FMT_POSINT;
      break;
 
    case '.':
      token = FMT_PERIOD;
      break;
 
    case ',':
      token = FMT_COMMA;
      break;
 
    case ':':
      token = FMT_COLON;
      break;
 
    case '/':
      token = FMT_SLASH;
      break;
 
    case '$':
      token = FMT_DOLLAR;
      break;
 
    case 'T':
      c = next_char_not_space ();
      if (c != 'L' && c != 'R')
        unget_char ();
 
      token = FMT_POS;
      break;
 
    case '(':
      token = FMT_LPAREN;
      break;
 
    case ')':
      token = FMT_RPAREN;
      break;
 
    case 'X':
      token = FMT_X;
      break;
 
    case 'S':
      c = next_char_not_space ();
      if (c != 'P' && c != 'S')
        unget_char ();
 
      token = FMT_SIGN;
      break;
 
    case 'B':
      c = next_char_not_space ();
      if (c == 'N' || c == 'Z')
        token = FMT_BLANK;
      else
        {
          unget_char ();
          token = FMT_IBOZ;
        }
 
      break;
 
    case '\'':
    case '"':
      delim = c;
 
      value = 0;
 
      for (;;)
        {
          c = next_char (1);
          if (c == '\0')
            {
              token = FMT_END;
              break;
            }
 
          if (c == delim)
            {
              c = next_char (1);
 
              if (c == '\0')
                {
                  token = FMT_END;
                  break;
                }
 
              if (c != delim)
                {
                  unget_char ();
                  token = FMT_CHAR;
                  break;
                }
            }
          value++;
        }
      break;
 
    case 'P':
      token = FMT_P;
      break;
 
    case 'I':
    case 'O':
    case 'Z':
      token = FMT_IBOZ;
      break;
 
    case 'F':
      token = FMT_F;
      break;
 
    case 'E':
      c = next_char_not_space ();
      if (c == 'N' || c == 'S')
        token = FMT_EXT;
      else
        {
          token = FMT_E;
          unget_char ();
        }
 
      break;
 
    case 'G':
      token = FMT_G;
      break;
 
    case 'H':
      token = FMT_H;
      break;
 
    case 'L':
      token = FMT_L;
      break;
 
    case 'A':
      token = FMT_A;
      break;
 
    case 'D':
      token = FMT_D;
      break;
 
    case '\0':
      token = FMT_END;
      break;
 
    default:
      token = FMT_UNKNOWN;
      break;
    }
 
  return token;
}
 
 
/* Check a format statement.  The format string, either from a FORMAT
   statement or a constant in an I/O statement has already been parsed
   by itself, and we are checking it for validity.  The dual origin
   means that the warning message is a little less than great.  */
 
static try
check_format (void)
{
  const char *posint_required     = _("Positive width required");
  const char *period_required     = _("Period required");
  const char *nonneg_required     = _("Nonnegative width required");
  const char *unexpected_element  = _("Unexpected element");
  const char *unexpected_end      = _("Unexpected end of format string");
 
  const char *error;
  format_token t, u;
  int level;
  int repeat;
  try rv;
 
  use_last_char = 0;
  saved_token = FMT_NONE;
  level = 0;
  repeat = 0;
  rv = SUCCESS;
 
  t = format_lex ();
  if (t != FMT_LPAREN)
    {
      error = _("Missing leading left parenthesis");
      goto syntax;
    }
 
  t = format_lex ();
  if (t == FMT_RPAREN)
    goto finished;              /* Empty format is legal */
  saved_token = t;
 
format_item:
  /* In this state, the next thing has to be a format item.  */
  t = format_lex ();
format_item_1:
  switch (t)
    {
    case FMT_POSINT:
      repeat = value;
      t = format_lex ();
      if (t == FMT_LPAREN)
        {
          level++;
          goto format_item;
        }
 
      if (t == FMT_SLASH)
        goto optional_comma;
 
      goto data_desc;
 
    case FMT_LPAREN:
      level++;
      goto format_item;
 
    case FMT_SIGNED_INT:
      /* Signed integer can only precede a P format.  */
      t = format_lex ();
      if (t != FMT_P)
        {
          error = _("Expected P edit descriptor");
          goto syntax;
        }
 
      goto data_desc;
 
    case FMT_P:
      /* P requires a prior number.  */
      error = _("P descriptor requires leading scale factor");
      goto syntax;
 
    case FMT_X:
      /* X requires a prior number if we're being pedantic.  */
      if (gfc_notify_std (GFC_STD_GNU, "Extension: X descriptor "
                          "requires leading space count at %C")
          == FAILURE)
        return FAILURE;
      goto between_desc;
 
    case FMT_SIGN:
    case FMT_BLANK:
      goto between_desc;
 
    case FMT_CHAR:
      goto extension_optional_comma;
 
    case FMT_COLON:
    case FMT_SLASH:
      goto optional_comma;
 
    case FMT_DOLLAR:
      t = format_lex ();
 
      if (gfc_notify_std (GFC_STD_GNU, "Extension: $ descriptor at %C")
          == FAILURE)
        return FAILURE;
      if (t != FMT_RPAREN || level > 0)
        {
          error = _("$ must be the last specifier");
          goto syntax;
        }
 
      goto finished;
 
    case FMT_POS:
    case FMT_IBOZ:
    case FMT_F:
    case FMT_E:
    case FMT_EXT:
    case FMT_G:
    case FMT_L:
    case FMT_A:
    case FMT_D:
      goto data_desc;
 
    case FMT_H:
      goto data_desc;
 
    case FMT_END:
      error = unexpected_end;
      goto syntax;
 
    default:
      error = unexpected_element;
      goto syntax;
    }
 
data_desc:
  /* In this state, t must currently be a data descriptor.
     Deal with things that can/must follow the descriptor.  */
  switch (t)
    {
    case FMT_SIGN:
    case FMT_BLANK:
    case FMT_X:
      break;
 
    case FMT_P:
      if (pedantic)
        {
          t = format_lex ();
          if (t == FMT_POSINT)
            {
              error = _("Repeat count cannot follow P descriptor");
              goto syntax;
            }
 
          saved_token = t;
        }
 
      goto optional_comma;
 
    case FMT_POS:
    case FMT_L:
      t = format_lex ();
      if (t == FMT_POSINT)
        break;
 
      switch (gfc_notification_std (GFC_STD_GNU))
        {
          case WARNING:
            gfc_warning
              ("Extension: Missing positive width after L descriptor at %C");
            saved_token = t;
            break;
 
          case ERROR:
            error = posint_required;
            goto syntax;
 
          case SILENT:
            saved_token = t;
            break;
 
          default:
            gcc_unreachable ();
        }
      break;
 
    case FMT_A:
      t = format_lex ();
      if (t != FMT_POSINT)
        saved_token = t;
      break;
 
    case FMT_D:
    case FMT_E:
    case FMT_G:
    case FMT_EXT:
      u = format_lex ();
      if (u != FMT_POSINT)
        {
          error = posint_required;
          goto syntax;
        }
 
      u = format_lex ();
      if (u != FMT_PERIOD)
        {
          error = period_required;
          goto syntax;
        }
 
      u = format_lex ();
      if (u != FMT_ZERO && u != FMT_POSINT)
        {
          error = nonneg_required;
          goto syntax;
        }
 
      if (t == FMT_D)
        break;
 
      /* Look for optional exponent.  */
      u = format_lex ();
      if (u != FMT_E)
        {
          saved_token = u;
        }
      else
        {
          u = format_lex ();
          if (u != FMT_POSINT)
            {
              error = _("Positive exponent width required");
              goto syntax;
            }
        }
 
      break;
 
    case FMT_F:
      t = format_lex ();
      if (t != FMT_ZERO && t != FMT_POSINT)
        {
          error = nonneg_required;
          goto syntax;
        }
 
      t = format_lex ();
      if (t != FMT_PERIOD)
        {
          error = period_required;
          goto syntax;
        }
 
      t = format_lex ();
      if (t != FMT_ZERO && t != FMT_POSINT)
        {
          error = nonneg_required;
          goto syntax;
        }
 
      break;
 
    case FMT_H:
      if(mode == MODE_STRING)
      {
        format_string += value;
        format_length -= value;
      }
      else
      {
        while(repeat >0)
         {
          next_char(1);
          repeat -- ;
         }
      }
     break;
 
    case FMT_IBOZ:
      t = format_lex ();
      if (t != FMT_ZERO && t != FMT_POSINT)
        {
          error = nonneg_required;
          goto syntax;
        }
 
      t = format_lex ();
      if (t != FMT_PERIOD)
        {
          saved_token = t;
        }
      else
        {
          t = format_lex ();
          if (t != FMT_ZERO && t != FMT_POSINT)
            {
              error = nonneg_required;
              goto syntax;
            }
        }
 
      break;
 
    default:
      error = unexpected_element;
      goto syntax;
    }
 
between_desc:
  /* Between a descriptor and what comes next.  */
  t = format_lex ();
  switch (t)
    {
 
    case FMT_COMMA:
      goto format_item;
 
    case FMT_RPAREN:
      level--;
      if (level < 0)
        goto finished;
      goto between_desc;
 
    case FMT_COLON:
    case FMT_SLASH:
      goto optional_comma;
 
    case FMT_END:
      error = unexpected_end;
      goto syntax;
 
    default:
      if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
          == FAILURE)
        return FAILURE;
      goto format_item_1;
    }
 
optional_comma:
  /* Optional comma is a weird between state where we've just finished
     reading a colon, slash or P descriptor.  */
  t = format_lex ();
  switch (t)
    {
    case FMT_COMMA:
      break;
 
    case FMT_RPAREN:
      level--;
      if (level < 0)
        goto finished;
      goto between_desc;
 
    default:
      /* Assume that we have another format item.  */
      saved_token = t;
      break;
    }
 
  goto format_item;
 
extension_optional_comma:
  /* As a GNU extension, permit a missing comma after a string literal.  */
  t = format_lex ();
  switch (t)
    {
    case FMT_COMMA:
      break;
 
    case FMT_RPAREN:
      level--;
      if (level < 0)
        goto finished;
      goto between_desc;
 
    case FMT_COLON:
    case FMT_SLASH:
      goto optional_comma;
 
    case FMT_END:
      error = unexpected_end;
      goto syntax;
 
    default:
      if (gfc_notify_std (GFC_STD_GNU, "Extension: Missing comma at %C")
          == FAILURE)
        return FAILURE;
      saved_token = t;
      break;
    }
 
  goto format_item;
 
syntax:
  /* Something went wrong.  If the format we're checking is a string,
     generate a warning, since the program is correct.  If the format
     is in a FORMAT statement, this messes up parsing, which is an
     error.  */
  if (mode != MODE_STRING)
    gfc_error ("%s in format string at %C", error);
  else
    {
      gfc_warning ("%s in format string at %C", error);
 
      /* TODO: More elaborate measures are needed to show where a problem
         is within a format string that has been calculated.  */
    }
 
  rv = FAILURE;
 
finished:
  return rv;
}
 
 
/* Given an expression node that is a constant string, see if it looks
   like a format string.  */
 
static void
check_format_string (gfc_expr * e)
{
 
  mode = MODE_STRING;
  format_string = e->value.character.string;
  check_format ();
}
 
 
/************ Fortran 95 I/O statement matchers *************/
 
/* Match a FORMAT statement.  This amounts to actually parsing the
   format descriptors in order to correctly locate the end of the
   format string.  */
 
match
gfc_match_format (void)
{
  gfc_expr *e;
  locus start;
 
  if (gfc_current_ns->proc_name
        && gfc_current_ns->proc_name->attr.flavor == FL_MODULE)
    {
      gfc_error ("Format statement in module main block at %C.");
      return MATCH_ERROR;
    }
 
  if (gfc_statement_label == NULL)
    {
      gfc_error ("Missing format label at %C");
      return MATCH_ERROR;
    }
  gfc_gobble_whitespace ();
 
  mode = MODE_FORMAT;
  format_length = 0;
 
  start = gfc_current_locus;
 
  if (check_format () == FAILURE)
    return MATCH_ERROR;
 
  if (gfc_match_eos () != MATCH_YES)
    {
      gfc_syntax_error (ST_FORMAT);
      return MATCH_ERROR;
    }
 
  /* The label doesn't get created until after the statement is done
     being matched, so we have to leave the string for later.  */
 
  gfc_current_locus = start;    /* Back to the beginning */
 
  new_st.loc = start;
  new_st.op = EXEC_NOP;
 
  e = gfc_get_expr();
  e->expr_type = EXPR_CONSTANT;
  e->ts.type = BT_CHARACTER;
  e->ts.kind = gfc_default_character_kind;
  e->where = start;
  e->value.character.string = format_string = gfc_getmem(format_length+1);
  e->value.character.length = format_length;
  gfc_statement_label->format = e;
 
  mode = MODE_COPY;
  check_format ();              /* Guaranteed to succeed */
  gfc_match_eos ();             /* Guaranteed to succeed */
 
  return MATCH_YES;
}
 
 
/* Match an expression I/O tag of some sort.  */
 
static match
match_etag (const io_tag * tag, gfc_expr ** v)
{
  gfc_expr *result;
  match m;
 
  m = gfc_match (tag->spec, &result);
  if (m != MATCH_YES)
    return m;
 
  if (*v != NULL)
    {
      gfc_error ("Duplicate %s specification at %C", tag->name);
      gfc_free_expr (result);
      return MATCH_ERROR;
    }
 
  *v = result;
  return MATCH_YES;
}
 
 
/* Match a variable I/O tag of some sort.  */
 
static match
match_vtag (const io_tag * tag, gfc_expr ** v)
{
  gfc_expr *result;
  match m;
 
  m = gfc_match (tag->spec, &result);
  if (m != MATCH_YES)
    return m;
 
  if (*v != NULL)
    {
      gfc_error ("Duplicate %s specification at %C", tag->name);
      gfc_free_expr (result);
      return MATCH_ERROR;
    }
 
  if (result->symtree->n.sym->attr.intent == INTENT_IN)
    {
      gfc_error ("Variable tag cannot be INTENT(IN) at %C");
      gfc_free_expr (result);
      return MATCH_ERROR;
    }
 
  if (gfc_pure (NULL) && gfc_impure_variable (result->symtree->n.sym))
    {
      gfc_error ("Variable tag cannot be assigned in PURE procedure at %C");
      gfc_free_expr (result);
      return MATCH_ERROR;
    }
 
  *v = result;
  return MATCH_YES;
}
 
 
/* Match I/O tags that cause variables to become redefined.  */
 
static match
match_out_tag(const io_tag *tag, gfc_expr **result)
{
  match m;
 
  m = match_vtag(tag, result);
  if (m == MATCH_YES)
    gfc_check_do_variable((*result)->symtree);
 
  return m;
}
 
 
/* Match a label I/O tag.  */
 
static match
match_ltag (const io_tag * tag, gfc_st_label ** label)
{
  match m;
  gfc_st_label *old;
 
  old = *label;
  m = gfc_match (tag->spec, label);
  if (m == MATCH_YES && old != 0)
    {
      gfc_error ("Duplicate %s label specification at %C", tag->name);
      return MATCH_ERROR;
    }
 
  if (m == MATCH_YES
      && gfc_reference_st_label (*label, ST_LABEL_TARGET) == FAILURE)
    return MATCH_ERROR;
 
  return m;
}
 
 
/* Do expression resolution and type-checking on an expression tag.  */
 
static try
resolve_tag (const io_tag * tag, gfc_expr * e)
{
 
  if (e == NULL)
    return SUCCESS;
 
  if (gfc_resolve_expr (e) == FAILURE)
    return FAILURE;
 
  if (e->ts.type != tag->type && tag != &tag_format)
    {
      gfc_error ("%s tag at %L must be of type %s", tag->name,
                &e->where, gfc_basic_typename (tag->type));
      return FAILURE;
    }
 
  if (tag == &tag_format)
    {
      if (e->expr_type == EXPR_CONSTANT
          && (e->ts.type != BT_CHARACTER
              || e->ts.kind != gfc_default_character_kind))
        {
          gfc_error ("Constant expression in FORMAT tag at %L must be "
                     "of type default CHARACTER", &e->where);
          return FAILURE;
        }
 
      /* If e's rank is zero and e is not an element of an array, it should be
         of integer or character type.  The integer variable should be
         ASSIGNED.  */
      if (e->symtree == NULL || e->symtree->n.sym->as == NULL
                || e->symtree->n.sym->as->rank == 0)
        {
          if (e->ts.type != BT_CHARACTER && e->ts.type != BT_INTEGER)
            {
              gfc_error ("%s tag at %L must be of type %s or %s", tag->name,
                        &e->where, gfc_basic_typename (BT_CHARACTER),
                        gfc_basic_typename (BT_INTEGER));
              return FAILURE;
            }
          else if (e->ts.type == BT_INTEGER && e->expr_type == EXPR_VARIABLE)
            {
              if (gfc_notify_std (GFC_STD_F95_DEL,
                        "Obsolete: ASSIGNED variable in FORMAT tag at %L",
                        &e->where) == FAILURE)
                return FAILURE;
              if (e->symtree->n.sym->attr.assign != 1)
                {
                  gfc_error ("Variable '%s' at %L has not been assigned a "
                        "format label", e->symtree->n.sym->name, &e->where);
                  return FAILURE;
                }
            }
          return SUCCESS;
        }
      else
        {
          /* if rank is nonzero, we allow the type to be character under
             GFC_STD_GNU and other type under GFC_STD_LEGACY. It may be
             assigned an Hollerith constant.  */
          if (e->ts.type == BT_CHARACTER)
            {
              if (gfc_notify_std (GFC_STD_GNU,
                        "Extension: Character array in FORMAT tag at %L",
                        &e->where) == FAILURE)
                return FAILURE;
            }
          else
            {
              if (gfc_notify_std (GFC_STD_LEGACY,
                        "Extension: Non-character in FORMAT tag at %L",
                        &e->where) == FAILURE)
                return FAILURE;
            }
          return SUCCESS;
        }
    }
  else
    {
      if (e->rank != 0)
        {
          gfc_error ("%s tag at %L must be scalar", tag->name, &e->where);
          return FAILURE;
        }
 
      if (tag == &tag_iomsg)
        {
          if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: IOMSG tag at %L",
                              &e->where) == FAILURE)
            return FAILURE;
        }
 
      if (tag == &tag_iostat && e->ts.kind != gfc_default_integer_kind)
        {
          if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
                              "INTEGER in IOSTAT tag at %L",
                              &e->where) == FAILURE)
            return FAILURE;
        }
 
      if (tag == &tag_size && e->ts.kind != gfc_default_integer_kind)
        {
          if (gfc_notify_std (GFC_STD_GNU, "Fortran 95 requires default "
                              "INTEGER in SIZE tag at %L",
                              &e->where) == FAILURE)
            return FAILURE;
        }
 
      if (tag == &tag_convert)
        {
          if (gfc_notify_std (GFC_STD_GNU, "Extension: CONVERT tag at %L",
                              &e->where) == FAILURE)
            return FAILURE;
        }
    }
  return SUCCESS;
}
 
 
/* Match a single tag of an OPEN statement.  */
 
static match
match_open_element (gfc_open * open)
{
  match m;
 
  m = match_etag (&tag_unit, &open->unit);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iomsg, &open->iomsg);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iostat, &open->iostat);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_file, &open->file);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_status, &open->status);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_access, &open->access);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_form, &open->form);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_recl, &open->recl);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_blank, &open->blank);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_position, &open->position);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_action, &open->action);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_delim, &open->delim);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_e_pad, &open->pad);
  if (m != MATCH_NO)
    return m;
  m = match_ltag (&tag_err, &open->err);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_convert, &open->convert);
  if (m != MATCH_NO)
    return m;
 
  return MATCH_NO;
}
 
 
/* Free the gfc_open structure and all the expressions it contains.  */
 
void
gfc_free_open (gfc_open * open)
{
 
  if (open == NULL)
    return;
 
  gfc_free_expr (open->unit);
  gfc_free_expr (open->iomsg);
  gfc_free_expr (open->iostat);
  gfc_free_expr (open->file);
  gfc_free_expr (open->status);
  gfc_free_expr (open->access);
  gfc_free_expr (open->form);
  gfc_free_expr (open->recl);
  gfc_free_expr (open->blank);
  gfc_free_expr (open->position);
  gfc_free_expr (open->action);
  gfc_free_expr (open->delim);
  gfc_free_expr (open->pad);
  gfc_free_expr (open->convert);
 
  gfc_free (open);
}
 
 
/* Resolve everything in a gfc_open structure.  */
 
try
gfc_resolve_open (gfc_open * open)
{
 
  RESOLVE_TAG (&tag_unit, open->unit);
  RESOLVE_TAG (&tag_iomsg, open->iomsg);
  RESOLVE_TAG (&tag_iostat, open->iostat);
  RESOLVE_TAG (&tag_file, open->file);
  RESOLVE_TAG (&tag_status, open->status);
  RESOLVE_TAG (&tag_e_access, open->access);
  RESOLVE_TAG (&tag_e_form, open->form);
  RESOLVE_TAG (&tag_e_recl, open->recl);
 
  RESOLVE_TAG (&tag_e_blank, open->blank);
  RESOLVE_TAG (&tag_e_position, open->position);
  RESOLVE_TAG (&tag_e_action, open->action);
  RESOLVE_TAG (&tag_e_delim, open->delim);
  RESOLVE_TAG (&tag_e_pad, open->pad);
  RESOLVE_TAG (&tag_convert, open->convert);
 
  if (gfc_reference_st_label (open->err, ST_LABEL_TARGET) == FAILURE)
    return FAILURE;
 
  return SUCCESS;
}
 
 
/* Match an OPEN statement.  */
 
match
gfc_match_open (void)
{
  gfc_open *open;
  match m;
 
  m = gfc_match_char ('(');
  if (m == MATCH_NO)
    return m;
 
  open = gfc_getmem (sizeof (gfc_open));
 
  m = match_open_element (open);
 
  if (m == MATCH_ERROR)
    goto cleanup;
  if (m == MATCH_NO)
    {
      m = gfc_match_expr (&open->unit);
      if (m == MATCH_NO)
        goto syntax;
      if (m == MATCH_ERROR)
        goto cleanup;
    }
 
  for (;;)
    {
      if (gfc_match_char (')') == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
 
      m = match_open_element (open);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
    }
 
  if (gfc_match_eos () == MATCH_NO)
    goto syntax;
 
  if (gfc_pure (NULL))
    {
      gfc_error ("OPEN statement not allowed in PURE procedure at %C");
      goto cleanup;
    }
 
  new_st.op = EXEC_OPEN;
  new_st.ext.open = open;
  return MATCH_YES;
 
syntax:
  gfc_syntax_error (ST_OPEN);
 
cleanup:
  gfc_free_open (open);
  return MATCH_ERROR;
}
 
 
/* Free a gfc_close structure an all its expressions.  */
 
void
gfc_free_close (gfc_close * close)
{
 
  if (close == NULL)
    return;
 
  gfc_free_expr (close->unit);
  gfc_free_expr (close->iomsg);
  gfc_free_expr (close->iostat);
  gfc_free_expr (close->status);
 
  gfc_free (close);
}
 
 
/* Match elements of a CLOSE statement.  */
 
static match
match_close_element (gfc_close * close)
{
  match m;
 
  m = match_etag (&tag_unit, &close->unit);
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_status, &close->status);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iomsg, &close->iomsg);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iostat, &close->iostat);
  if (m != MATCH_NO)
    return m;
  m = match_ltag (&tag_err, &close->err);
  if (m != MATCH_NO)
    return m;
 
  return MATCH_NO;
}
 
 
/* Match a CLOSE statement.  */
 
match
gfc_match_close (void)
{
  gfc_close *close;
  match m;
 
  m = gfc_match_char ('(');
  if (m == MATCH_NO)
    return m;
 
  close = gfc_getmem (sizeof (gfc_close));
 
  m = match_close_element (close);
 
  if (m == MATCH_ERROR)
    goto cleanup;
  if (m == MATCH_NO)
    {
      m = gfc_match_expr (&close->unit);
      if (m == MATCH_NO)
        goto syntax;
      if (m == MATCH_ERROR)
        goto cleanup;
    }
 
  for (;;)
    {
      if (gfc_match_char (')') == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
 
      m = match_close_element (close);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
    }
 
  if (gfc_match_eos () == MATCH_NO)
    goto syntax;
 
  if (gfc_pure (NULL))
    {
      gfc_error ("CLOSE statement not allowed in PURE procedure at %C");
      goto cleanup;
    }
 
  new_st.op = EXEC_CLOSE;
  new_st.ext.close = close;
  return MATCH_YES;
 
syntax:
  gfc_syntax_error (ST_CLOSE);
 
cleanup:
  gfc_free_close (close);
  return MATCH_ERROR;
}
 
 
/* Resolve everything in a gfc_close structure.  */
 
try
gfc_resolve_close (gfc_close * close)
{
 
  RESOLVE_TAG (&tag_unit, close->unit);
  RESOLVE_TAG (&tag_iomsg, close->iomsg);
  RESOLVE_TAG (&tag_iostat, close->iostat);
  RESOLVE_TAG (&tag_status, close->status);
 
  if (gfc_reference_st_label (close->err, ST_LABEL_TARGET) == FAILURE)
    return FAILURE;
 
  return SUCCESS;
}
 
 
/* Free a gfc_filepos structure.  */
 
void
gfc_free_filepos (gfc_filepos * fp)
{
 
  gfc_free_expr (fp->unit);
  gfc_free_expr (fp->iomsg);
  gfc_free_expr (fp->iostat);
  gfc_free (fp);
}
 
 
/* Match elements of a REWIND, BACKSPACE, ENDFILE, or FLUSH statement.  */
 
static match
match_file_element (gfc_filepos * fp)
{
  match m;
 
  m = match_etag (&tag_unit, &fp->unit);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iomsg, &fp->iomsg);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iostat, &fp->iostat);
  if (m != MATCH_NO)
    return m;
  m = match_ltag (&tag_err, &fp->err);
  if (m != MATCH_NO)
    return m;
 
  return MATCH_NO;
}
 
 
/* Match the second half of the file-positioning statements, REWIND,
   BACKSPACE, ENDFILE, or the FLUSH statement.  */
 
static match
match_filepos (gfc_statement st, gfc_exec_op op)
{
  gfc_filepos *fp;
  match m;
 
  fp = gfc_getmem (sizeof (gfc_filepos));
 
  if (gfc_match_char ('(') == MATCH_NO)
    {
      m = gfc_match_expr (&fp->unit);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
 
      goto done;
    }
 
  m = match_file_element (fp);
  if (m == MATCH_ERROR)
    goto done;
  if (m == MATCH_NO)
    {
      m = gfc_match_expr (&fp->unit);
      if (m == MATCH_ERROR)
        goto done;
      if (m == MATCH_NO)
        goto syntax;
    }
 
  for (;;)
    {
      if (gfc_match_char (')') == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
 
      m = match_file_element (fp);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
    }
 
done:
  if (gfc_match_eos () != MATCH_YES)
    goto syntax;
 
  if (gfc_pure (NULL))
    {
      gfc_error ("%s statement not allowed in PURE procedure at %C",
                 gfc_ascii_statement (st));
 
      goto cleanup;
    }
 
  new_st.op = op;
  new_st.ext.filepos = fp;
  return MATCH_YES;
 
syntax:
  gfc_syntax_error (st);
 
cleanup:
  gfc_free_filepos (fp);
  return MATCH_ERROR;
}
 
 
try
gfc_resolve_filepos (gfc_filepos * fp)
{
 
  RESOLVE_TAG (&tag_unit, fp->unit);
  RESOLVE_TAG (&tag_iostat, fp->iostat);
  RESOLVE_TAG (&tag_iomsg, fp->iomsg);
  if (gfc_reference_st_label (fp->err, ST_LABEL_TARGET) == FAILURE)
    return FAILURE;
 
  return SUCCESS;
}
 
 
/* Match the file positioning statements: ENDFILE, BACKSPACE, REWIND,
   and the FLUSH statement.  */
 
match
gfc_match_endfile (void)
{
 
  return match_filepos (ST_END_FILE, EXEC_ENDFILE);
}
 
match
gfc_match_backspace (void)
{
 
  return match_filepos (ST_BACKSPACE, EXEC_BACKSPACE);
}
 
match
gfc_match_rewind (void)
{
 
  return match_filepos (ST_REWIND, EXEC_REWIND);
}
 
match
gfc_match_flush (void)
{
  if (gfc_notify_std (GFC_STD_F2003, "Fortran 2003: FLUSH statement at %C") == FAILURE)
    return MATCH_ERROR;
 
  return match_filepos (ST_FLUSH, EXEC_FLUSH);
}
 
/******************** Data Transfer Statements *********************/
 
typedef enum
{ M_READ, M_WRITE, M_PRINT, M_INQUIRE }
io_kind;
 
 
/* Return a default unit number.  */
 
static gfc_expr *
default_unit (io_kind k)
{
  int unit;
 
  if (k == M_READ)
    unit = 5;
  else
    unit = 6;
 
  return gfc_int_expr (unit);
}
 
 
/* Match a unit specification for a data transfer statement.  */
 
static match
match_dt_unit (io_kind k, gfc_dt * dt)
{
  gfc_expr *e;
 
  if (gfc_match_char ('*') == MATCH_YES)
    {
      if (dt->io_unit != NULL)
        goto conflict;
 
      dt->io_unit = default_unit (k);
      return MATCH_YES;
    }
 
  if (gfc_match_expr (&e) == MATCH_YES)
    {
      if (dt->io_unit != NULL)
        {
          gfc_free_expr (e);
          goto conflict;
        }
 
      dt->io_unit = e;
      return MATCH_YES;
    }
 
  return MATCH_NO;
 
conflict:
  gfc_error ("Duplicate UNIT specification at %C");
  return MATCH_ERROR;
}
 
 
/* Match a format specification.  */
 
static match
match_dt_format (gfc_dt * dt)
{
  locus where;
  gfc_expr *e;
  gfc_st_label *label;
 
  where = gfc_current_locus;
 
  if (gfc_match_char ('*') == MATCH_YES)
    {
      if (dt->format_expr != NULL || dt->format_label != NULL)
        goto conflict;
 
      dt->format_label = &format_asterisk;
      return MATCH_YES;
    }
 
  if (gfc_match_st_label (&label) == MATCH_YES)
    {
      if (dt->format_expr != NULL || dt->format_label != NULL)
        {
          gfc_free_st_label (label);
          goto conflict;
        }
 
      if (gfc_reference_st_label (label, ST_LABEL_FORMAT) == FAILURE)
        return MATCH_ERROR;
 
      dt->format_label = label;
      return MATCH_YES;
    }
 
  if (gfc_match_expr (&e) == MATCH_YES)
    {
      if (dt->format_expr != NULL || dt->format_label != NULL)
        {
          gfc_free_expr (e);
          goto conflict;
        }
      dt->format_expr = e;
      return MATCH_YES;
    }
 
  gfc_current_locus = where;    /* The only case where we have to restore */
 
  return MATCH_NO;
 
conflict:
  gfc_error ("Duplicate format specification at %C");
  return MATCH_ERROR;
}
 
 
/* Traverse a namelist that is part of a READ statement to make sure
   that none of the variables in the namelist are INTENT(IN).  Returns
   nonzero if we find such a variable.  */
 
static int
check_namelist (gfc_symbol * sym)
{
  gfc_namelist *p;
 
  for (p = sym->namelist; p; p = p->next)
    if (p->sym->attr.intent == INTENT_IN)
      {
        gfc_error ("Symbol '%s' in namelist '%s' is INTENT(IN) at %C",
                   p->sym->name, sym->name);
        return 1;
      }
 
  return 0;
}
 
 
/* Match a single data transfer element.  */
 
static match
match_dt_element (io_kind k, gfc_dt * dt)
{
  char name[GFC_MAX_SYMBOL_LEN + 1];
  gfc_symbol *sym;
  match m;
 
  if (gfc_match (" unit =") == MATCH_YES)
    {
      m = match_dt_unit (k, dt);
      if (m != MATCH_NO)
        return m;
    }
 
  if (gfc_match (" fmt =") == MATCH_YES)
    {
      m = match_dt_format (dt);
      if (m != MATCH_NO)
        return m;
    }
 
  if (gfc_match (" nml = %n", name) == MATCH_YES)
    {
      if (dt->namelist != NULL)
        {
          gfc_error ("Duplicate NML specification at %C");
          return MATCH_ERROR;
        }
 
      if (gfc_find_symbol (name, NULL, 1, &sym))
        return MATCH_ERROR;
 
      if (sym == NULL || sym->attr.flavor != FL_NAMELIST)
        {
          gfc_error ("Symbol '%s' at %C must be a NAMELIST group name",
                     sym != NULL ? sym->name : name);
          return MATCH_ERROR;
        }
 
      dt->namelist = sym;
      if (k == M_READ && check_namelist (sym))
        return MATCH_ERROR;
 
      return MATCH_YES;
    }
 
  m = match_etag (&tag_rec, &dt->rec);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iomsg, &dt->iomsg);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_iostat, &dt->iostat);
  if (m != MATCH_NO)
    return m;
  m = match_ltag (&tag_err, &dt->err);
  if (m == MATCH_YES)
    dt->err_where = gfc_current_locus;
  if (m != MATCH_NO)
    return m;
  m = match_etag (&tag_advance, &dt->advance);
  if (m != MATCH_NO)
    return m;
  m = match_out_tag (&tag_size, &dt->size);
  if (m != MATCH_NO)
    return m;
 
  m = match_ltag (&tag_end, &dt->end);
  if (m == MATCH_YES)
    {
      if (k == M_WRITE)
       {
         gfc_error ("END tag at %C not allowed in output statement");
         return MATCH_ERROR;
       }
      dt->end_where = gfc_current_locus;
    }
  if (m != MATCH_NO)
    return m;
 
  m = match_ltag (&tag_eor, &dt->eor);
  if (m == MATCH_YES)
    dt->eor_where = gfc_current_locus;
  if (m != MATCH_NO)
    return m;
 
  return MATCH_NO;
}
 
 
/* Free a data transfer structure and everything below it.  */
 
void
gfc_free_dt (gfc_dt * dt)
{
 
  if (dt == NULL)
    return;
 
  gfc_free_expr (dt->io_unit);
  gfc_free_expr (dt->format_expr);
  gfc_free_expr (dt->rec);
  gfc_free_expr (dt->advance);
  gfc_free_expr (dt->iomsg);
  gfc_free_expr (dt->iostat);
  gfc_free_expr (dt->size);
 
  gfc_free (dt);
}
 
 
/* Resolve everything in a gfc_dt structure.  */
 
try
gfc_resolve_dt (gfc_dt * dt)
{
  gfc_expr *e;
 
  RESOLVE_TAG (&tag_format, dt->format_expr);
  RESOLVE_TAG (&tag_rec, dt->rec);
  RESOLVE_TAG (&tag_advance, dt->advance);
  RESOLVE_TAG (&tag_iomsg, dt->iomsg);
  RESOLVE_TAG (&tag_iostat, dt->iostat);
  RESOLVE_TAG (&tag_size, dt->size);
 
  e = dt->io_unit;
  if (gfc_resolve_expr (e) == SUCCESS
      && (e->ts.type != BT_INTEGER
          && (e->ts.type != BT_CHARACTER
              || e->expr_type != EXPR_VARIABLE)))
    {
      gfc_error
        ("UNIT specification at %L must be an INTEGER expression or a "
         "CHARACTER variable", &e->where);
      return FAILURE;
    }
 
  if (e->ts.type == BT_CHARACTER)
    {
      if (gfc_has_vector_index (e))
        {
          gfc_error ("Internal unit with vector subscript at %L",
                     &e->where);
          return FAILURE;
        }
    }
 
  if (e->rank && e->ts.type != BT_CHARACTER)
    {
      gfc_error ("External IO UNIT cannot be an array at %L", &e->where);
      return FAILURE;
    }
 
  if (dt->err)
    {
      if (gfc_reference_st_label (dt->err, ST_LABEL_TARGET) == FAILURE)
        return FAILURE;
      if (dt->err->defined == ST_LABEL_UNKNOWN)
        {
          gfc_error ("ERR tag label %d at %L not defined",
                      dt->err->value, &dt->err_where);
          return FAILURE;
        }
    }
 
  if (dt->end)
    {
      if (gfc_reference_st_label (dt->end, ST_LABEL_TARGET) == FAILURE)
        return FAILURE;
      if (dt->end->defined == ST_LABEL_UNKNOWN)
        {
          gfc_error ("END tag label %d at %L not defined",
                      dt->end->value, &dt->end_where);
          return FAILURE;
        }
    }
 
  if (dt->eor)
    {
      if (gfc_reference_st_label (dt->eor, ST_LABEL_TARGET) == FAILURE)
        return FAILURE;
      if (dt->eor->defined == ST_LABEL_UNKNOWN)
        {
          gfc_error ("EOR tag label %d at %L not defined",
                      dt->eor->value, &dt->eor_where);
          return FAILURE;
        }
    }
 
  /* Check the format label actually exists.  */
  if (dt->format_label && dt->format_label != &format_asterisk
      && dt->format_label->defined == ST_LABEL_UNKNOWN)
    {
      gfc_error ("FORMAT label %d at %L not defined", dt->format_label->value,
                 &dt->format_label->where);
      return FAILURE;
    }
  return SUCCESS;
}
 
 
/* Given an io_kind, return its name.  */
 
static const char *
io_kind_name (io_kind k)
{
  const char *name;
 
  switch (k)
    {
    case M_READ:
      name = "READ";
      break;
    case M_WRITE:
      name = "WRITE";
      break;
    case M_PRINT:
      name = "PRINT";
      break;
    case M_INQUIRE:
      name = "INQUIRE";
      break;
    default:
      gfc_internal_error ("io_kind_name(): bad I/O-kind");
    }
 
  return name;
}
 
 
/* Match an IO iteration statement of the form:
 
   ( [<IO element> ,] <IO element>, I = <expr>, <expr> [, <expr> ] )
 
   which is equivalent to a single IO element.  This function is
   mutually recursive with match_io_element().  */
 
static match match_io_element (io_kind k, gfc_code **);
 
static match
match_io_iterator (io_kind k, gfc_code ** result)
{
  gfc_code *head, *tail, *new;
  gfc_iterator *iter;
  locus old_loc;
  match m;
  int n;
 
  iter = NULL;
  head = NULL;
  old_loc = gfc_current_locus;
 
  if (gfc_match_char ('(') != MATCH_YES)
    return MATCH_NO;
 
  m = match_io_element (k, &head);
  tail = head;
 
  if (m != MATCH_YES || gfc_match_char (',') != MATCH_YES)
    {
      m = MATCH_NO;
      goto cleanup;
    }
 
  /* Can't be anything but an IO iterator.  Build a list.  */
  iter = gfc_get_iterator ();
 
  for (n = 1;; n++)
    {
      m = gfc_match_iterator (iter, 0);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_YES)
        {
          gfc_check_do_variable (iter->var->symtree);
          break;
        }
 
      m = match_io_element (k, &new);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        {
          if (n > 2)
            goto syntax;
          goto cleanup;
        }
 
      tail = gfc_append_code (tail, new);
 
      if (gfc_match_char (',') != MATCH_YES)
        {
          if (n > 2)
            goto syntax;
          m = MATCH_NO;
          goto cleanup;
        }
    }
 
  if (gfc_match_char (')') != MATCH_YES)
    goto syntax;
 
  new = gfc_get_code ();
  new->op = EXEC_DO;
  new->ext.iterator = iter;
 
  new->block = gfc_get_code ();
  new->block->op = EXEC_DO;
  new->block->next = head;
 
  *result = new;
  return MATCH_YES;
 
syntax:
  gfc_error ("Syntax error in I/O iterator at %C");
  m = MATCH_ERROR;
 
cleanup:
  gfc_free_iterator (iter, 1);
  gfc_free_statements (head);
  gfc_current_locus = old_loc;
  return m;
}
 
 
/* Match a single element of an IO list, which is either a single
   expression or an IO Iterator.  */
 
static match
match_io_element (io_kind k, gfc_code ** cpp)
{
  gfc_expr *expr;
  gfc_code *cp;
  match m;
 
  expr = NULL;
 
  m = match_io_iterator (k, cpp);
  if (m == MATCH_YES)
    return MATCH_YES;
 
  if (k == M_READ)
    {
      m = gfc_match_variable (&expr, 0);
      if (m == MATCH_NO)
        gfc_error ("Expected variable in READ statement at %C");
    }
  else
    {
      m = gfc_match_expr (&expr);
      if (m == MATCH_NO)
        gfc_error ("Expected expression in %s statement at %C",
                   io_kind_name (k));
    }
 
  if (m == MATCH_YES)
    switch (k)
      {
      case M_READ:
        if (expr->symtree->n.sym->attr.intent == INTENT_IN)
          {
            gfc_error
              ("Variable '%s' in input list at %C cannot be INTENT(IN)",
               expr->symtree->n.sym->name);
            m = MATCH_ERROR;
          }
 
        if (gfc_pure (NULL)
            && gfc_impure_variable (expr->symtree->n.sym)
            && current_dt->io_unit->ts.type == BT_CHARACTER)
          {
            gfc_error ("Cannot read to variable '%s' in PURE procedure at %C",
                       expr->symtree->n.sym->name);
            m = MATCH_ERROR;
          }
 
        if (gfc_check_do_variable (expr->symtree))
          m = MATCH_ERROR;
 
        break;
 
      case M_WRITE:
        if (current_dt->io_unit->ts.type == BT_CHARACTER
            && gfc_pure (NULL)
            && current_dt->io_unit->expr_type == EXPR_VARIABLE
            && gfc_impure_variable (current_dt->io_unit->symtree->n.sym))
          {
            gfc_error
              ("Cannot write to internal file unit '%s' at %C inside a "
               "PURE procedure", current_dt->io_unit->symtree->n.sym->name);
            m = MATCH_ERROR;
          }
 
        break;
 
      default:
        break;
      }
 
  if (m != MATCH_YES)
    {
      gfc_free_expr (expr);
      return MATCH_ERROR;
    }
 
  cp = gfc_get_code ();
  cp->op = EXEC_TRANSFER;
  cp->expr = expr;
 
  *cpp = cp;
  return MATCH_YES;
}
 
 
/* Match an I/O list, building gfc_code structures as we go.  */
 
static match
match_io_list (io_kind k, gfc_code ** head_p)
{
  gfc_code *head, *tail, *new;
  match m;
 
  *head_p = head = tail = NULL;
  if (gfc_match_eos () == MATCH_YES)
    return MATCH_YES;
 
  for (;;)
    {
      m = match_io_element (k, &new);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
 
      tail = gfc_append_code (tail, new);
      if (head == NULL)
        head = new;
 
      if (gfc_match_eos () == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
    }
 
  *head_p = head;
  return MATCH_YES;
 
syntax:
  gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
 
cleanup:
  gfc_free_statements (head);
  return MATCH_ERROR;
}
 
 
/* Attach the data transfer end node.  */
 
static void
terminate_io (gfc_code * io_code)
{
  gfc_code *c;
 
  if (io_code == NULL)
    io_code = new_st.block;
 
  c = gfc_get_code ();
  c->op = EXEC_DT_END;
 
  /* Point to structure that is already there */
  c->ext.dt = new_st.ext.dt;
  gfc_append_code (io_code, c);
}
 
 
/* Check the constraints for a data transfer statement.  The majority of the
   constraints appearing in 9.4 of the standard appear here.  Some are handled
   in resolve_tag and others in gfc_resolve_dt.  */
 
static match
check_io_constraints (io_kind k, gfc_dt *dt, gfc_code * io_code, locus * spec_end)
{
#define io_constraint(condition,msg,arg)\
if (condition) \
  {\
    gfc_error(msg,arg);\
    m = MATCH_ERROR;\
  }
 
  match m;
  gfc_expr * expr;
  gfc_symbol * sym = NULL;
 
  m = MATCH_YES;
 
  expr = dt->io_unit;
  if (expr && expr->expr_type == EXPR_VARIABLE
        && expr->ts.type == BT_CHARACTER)
    {
      sym = expr->symtree->n.sym;
 
      io_constraint (k == M_WRITE && sym->attr.intent == INTENT_IN,
                     "Internal file at %L must not be INTENT(IN)",
                     &expr->where);
 
      io_constraint (gfc_has_vector_index (dt->io_unit),
                     "Internal file incompatible with vector subscript at %L",
                     &expr->where);
 
      io_constraint (dt->rec != NULL,
                     "REC tag at %L is incompatible with internal file",
                     &dt->rec->where);
 
      io_constraint (dt->namelist != NULL,
                     "Internal file at %L is incompatible with namelist",
                     &expr->where);
 
      io_constraint (dt->advance != NULL,
                     "ADVANCE tag at %L is incompatible with internal file",
                     &dt->advance->where);
    }
 
  if (expr && expr->ts.type != BT_CHARACTER)
    {
 
      io_constraint (gfc_pure (NULL)
                       && (k == M_READ || k == M_WRITE),
                     "IO UNIT in %s statement at %C must be "
                     "an internal file in a PURE procedure",
                     io_kind_name (k));
    }
 
 
  if (k != M_READ)
    {
      io_constraint (dt->end,
                     "END tag not allowed with output at %L",
                     &dt->end_where);
 
      io_constraint (dt->eor,
                     "EOR tag not allowed with output at %L",
                     &dt->eor_where);
 
      io_constraint (k != M_READ && dt->size,
                     "SIZE=specifier not allowed with output at %L",
                     &dt->size->where);
    }
  else
    {
      io_constraint (dt->size && dt->advance == NULL,
                     "SIZE tag at %L requires an ADVANCE tag",
                     &dt->size->where);
 
      io_constraint (dt->eor && dt->advance == NULL,
                     "EOR tag at %L requires an ADVANCE tag",
                     &dt->eor_where);
    }
 
 
 
  if (dt->namelist)
    {
      io_constraint (io_code && dt->namelist,
                     "NAMELIST cannot be followed by IO-list at %L",
                     &io_code->loc);
 
      io_constraint (dt->format_expr,
                     "IO spec-list cannot contain both NAMELIST group name "
                     "and format specification at %L.",
                     &dt->format_expr->where);
 
      io_constraint (dt->format_label,
                     "IO spec-list cannot contain both NAMELIST group name "
                     "and format label at %L", spec_end);
 
      io_constraint (dt->rec,
                     "NAMELIST IO is not allowed with a REC=specifier "
                     "at %L.", &dt->rec->where);
 
      io_constraint (dt->advance,
                     "NAMELIST IO is not allowed with a ADVANCE=specifier "
                     "at %L.", &dt->advance->where);
    }
 
  if (dt->rec)
    {
      io_constraint (dt->end,
                     "An END tag is not allowed with a "
                     "REC=specifier at %L.", &dt->end_where);
 
 
      io_constraint (dt->format_label == &format_asterisk,
                     "FMT=* is not allowed with a REC=specifier "
                     "at %L.", spec_end);
    }
 
  if (dt->advance)
    {
      int not_yes, not_no;
      expr = dt->advance;
 
      io_constraint (dt->format_label == &format_asterisk,
                     "List directed format(*) is not allowed with a "
                     "ADVANCE=specifier at %L.", &expr->where);
 
      if (expr->expr_type == EXPR_CONSTANT && expr->ts.type == BT_CHARACTER)
        {
          const char * advance = expr->value.character.string;
          not_no = strncasecmp (advance, "no", 2) != 0;
          not_yes = strncasecmp (advance, "yes", 2) != 0;
        }
      else
        {
          not_no = 0;
          not_yes = 0;
        }
 
      io_constraint (not_no && not_yes,
                     "ADVANCE=specifier at %L must have value = "
                     "YES or NO.", &expr->where);
 
      io_constraint (dt->size && not_no && k == M_READ,
                     "SIZE tag at %L requires an ADVANCE = 'NO'",
                     &dt->size->where);
 
      io_constraint (dt->eor && not_no && k == M_READ,
                     "EOR tag at %L requires an ADVANCE = 'NO'",
                     &dt->eor_where);
    }
 
  expr = dt->format_expr;
  if (expr != NULL && expr->expr_type == EXPR_CONSTANT)
    check_format_string (expr);
 
  return m;
}
#undef io_constraint
 
/* Match a READ, WRITE or PRINT statement.  */
 
static match
match_io (io_kind k)
{
  char name[GFC_MAX_SYMBOL_LEN + 1];
  gfc_code *io_code;
  gfc_symbol *sym;
  int comma_flag, c;
  locus where;
  locus spec_end;
  gfc_dt *dt;
  match m;
 
  where = gfc_current_locus;
  comma_flag = 0;
  current_dt = dt = gfc_getmem (sizeof (gfc_dt));
  if (gfc_match_char ('(') == MATCH_NO)
    {
      where = gfc_current_locus;
      if (k == M_WRITE)
        goto syntax;
      else if (k == M_PRINT)
        {
          /* Treat the non-standard case of PRINT namelist.  */
          if ((gfc_current_form == FORM_FIXED || gfc_peek_char () == ' ')
              && gfc_match_name (name) == MATCH_YES)
            {
              gfc_find_symbol (name, NULL, 1, &sym);
              if (sym && sym->attr.flavor == FL_NAMELIST)
                {
                  if (gfc_notify_std (GFC_STD_GNU, "PRINT namelist at "
                                      "%C is an extension") == FAILURE)
                    {
                      m = MATCH_ERROR;
                      goto cleanup;
                    }
 
                  dt->io_unit = default_unit (k);
                  dt->namelist = sym;
                  goto get_io_list;
                }
              else
                gfc_current_locus = where;
            }
        }
 
      if (gfc_current_form == FORM_FREE)
        {
          c = gfc_peek_char();
          if (c != ' ' && c != '*' && c != '\'' && c != '"')
            {
              m = MATCH_NO;
              goto cleanup;
            }
        }
 
      m = match_dt_format (dt);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
 
      comma_flag = 1;
      dt->io_unit = default_unit (k);
      goto get_io_list;
    }
 
  /* Match a control list */
  if (match_dt_element (k, dt) == MATCH_YES)
    goto next;
  if (match_dt_unit (k, dt) != MATCH_YES)
    goto loop;
 
  if (gfc_match_char (')') == MATCH_YES)
    goto get_io_list;
  if (gfc_match_char (',') != MATCH_YES)
    goto syntax;
 
  m = match_dt_element (k, dt);
  if (m == MATCH_YES)
    goto next;
  if (m == MATCH_ERROR)
    goto cleanup;
 
  m = match_dt_format (dt);
  if (m == MATCH_YES)
    goto next;
  if (m == MATCH_ERROR)
    goto cleanup;
 
  where = gfc_current_locus;
 
  m = gfc_match_name (name);
  if (m == MATCH_YES)
    {
      gfc_find_symbol (name, NULL, 1, &sym);
      if (sym && sym->attr.flavor == FL_NAMELIST)
        {
          dt->namelist = sym;
          if (k == M_READ && check_namelist (sym))
            {
              m = MATCH_ERROR;
              goto cleanup;
            }
          goto next;
        }
    }
 
  gfc_current_locus = where;
 
  goto loop;                    /* No matches, try regular elements */
 
next:
  if (gfc_match_char (')') == MATCH_YES)
    goto get_io_list;
  if (gfc_match_char (',') != MATCH_YES)
    goto syntax;
 
loop:
  for (;;)
    {
      m = match_dt_element (k, dt);
      if (m == MATCH_NO)
        goto syntax;
      if (m == MATCH_ERROR)
        goto cleanup;
 
      if (gfc_match_char (')') == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
    }
 
get_io_list:
 
  /* Used in check_io_constraints, where no locus is available.  */
  spec_end = gfc_current_locus;
 
  /* Optional leading comma (non-standard).  */
  if (!comma_flag
      && gfc_match_char (',') == MATCH_YES
      && k == M_WRITE
      && gfc_notify_std (GFC_STD_GNU, "Extension: Comma before output "
                         "item list at %C is an extension") == FAILURE)
    return MATCH_ERROR;
 
  io_code = NULL;
  if (gfc_match_eos () != MATCH_YES)
    {
      if (comma_flag && gfc_match_char (',') != MATCH_YES)
        {
          gfc_error ("Expected comma in I/O list at %C");
          m = MATCH_ERROR;
          goto cleanup;
        }
 
      m = match_io_list (k, &io_code);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
    }
 
  /* A full IO statement has been matched.  Check the constraints.  spec_end is
     supplied for cases where no locus is supplied.  */
  m = check_io_constraints (k, dt, io_code, &spec_end);
 
  if (m == MATCH_ERROR)
    goto cleanup;
 
  new_st.op = (k == M_READ) ? EXEC_READ : EXEC_WRITE;
  new_st.ext.dt = dt;
  new_st.block = gfc_get_code ();
  new_st.block->op = new_st.op;
  new_st.block->next = io_code;
 
  terminate_io (io_code);
 
  return MATCH_YES;
 
syntax:
  gfc_error ("Syntax error in %s statement at %C", io_kind_name (k));
  m = MATCH_ERROR;
 
cleanup:
  gfc_free_dt (dt);
  return m;
}
 
 
match
gfc_match_read (void)
{
  return match_io (M_READ);
}
 
match
gfc_match_write (void)
{
  return match_io (M_WRITE);
}
 
match
gfc_match_print (void)
{
  match m;
 
  m = match_io (M_PRINT);
  if (m != MATCH_YES)
    return m;
 
  if (gfc_pure (NULL))
    {
      gfc_error ("PRINT statement at %C not allowed within PURE procedure");
      return MATCH_ERROR;
    }
 
  return MATCH_YES;
}
 
 
/* Free a gfc_inquire structure.  */
 
void
gfc_free_inquire (gfc_inquire * inquire)
{
 
  if (inquire == NULL)
    return;
 
  gfc_free_expr (inquire->unit);
  gfc_free_expr (inquire->file);
  gfc_free_expr (inquire->iomsg);
  gfc_free_expr (inquire->iostat);
  gfc_free_expr (inquire->exist);
  gfc_free_expr (inquire->opened);
  gfc_free_expr (inquire->number);
  gfc_free_expr (inquire->named);
  gfc_free_expr (inquire->name);
  gfc_free_expr (inquire->access);
  gfc_free_expr (inquire->sequential);
  gfc_free_expr (inquire->direct);
  gfc_free_expr (inquire->form);
  gfc_free_expr (inquire->formatted);
  gfc_free_expr (inquire->unformatted);
  gfc_free_expr (inquire->recl);
  gfc_free_expr (inquire->nextrec);
  gfc_free_expr (inquire->blank);
  gfc_free_expr (inquire->position);
  gfc_free_expr (inquire->action);
  gfc_free_expr (inquire->read);
  gfc_free_expr (inquire->write);
  gfc_free_expr (inquire->readwrite);
  gfc_free_expr (inquire->delim);
  gfc_free_expr (inquire->pad);
  gfc_free_expr (inquire->iolength);
  gfc_free_expr (inquire->convert);
 
  gfc_free (inquire);
}
 
 
/* Match an element of an INQUIRE statement.  */
 
#define RETM   if (m != MATCH_NO) return m;
 
static match
match_inquire_element (gfc_inquire * inquire)
{
  match m;
 
  m = match_etag (&tag_unit, &inquire->unit);
  RETM m = match_etag (&tag_file, &inquire->file);
  RETM m = match_ltag (&tag_err, &inquire->err);
  RETM m = match_out_tag (&tag_iomsg, &inquire->iomsg);
  RETM m = match_out_tag (&tag_iostat, &inquire->iostat);
  RETM m = match_vtag (&tag_exist, &inquire->exist);
  RETM m = match_vtag (&tag_opened, &inquire->opened);
  RETM m = match_vtag (&tag_named, &inquire->named);
  RETM m = match_vtag (&tag_name, &inquire->name);
  RETM m = match_out_tag (&tag_number, &inquire->number);
  RETM m = match_vtag (&tag_s_access, &inquire->access);
  RETM m = match_vtag (&tag_sequential, &inquire->sequential);
  RETM m = match_vtag (&tag_direct, &inquire->direct);
  RETM m = match_vtag (&tag_s_form, &inquire->form);
  RETM m = match_vtag (&tag_formatted, &inquire->formatted);
  RETM m = match_vtag (&tag_unformatted, &inquire->unformatted);
  RETM m = match_out_tag (&tag_s_recl, &inquire->recl);
  RETM m = match_out_tag (&tag_nextrec, &inquire->nextrec);
  RETM m = match_vtag (&tag_s_blank, &inquire->blank);
  RETM m = match_vtag (&tag_s_position, &inquire->position);
  RETM m = match_vtag (&tag_s_action, &inquire->action);
  RETM m = match_vtag (&tag_read, &inquire->read);
  RETM m = match_vtag (&tag_write, &inquire->write);
  RETM m = match_vtag (&tag_readwrite, &inquire->readwrite);
  RETM m = match_vtag (&tag_s_delim, &inquire->delim);
  RETM m = match_vtag (&tag_s_pad, &inquire->pad);
  RETM m = match_vtag (&tag_iolength, &inquire->iolength);
  RETM m = match_vtag (&tag_convert, &inquire->convert);
  RETM return MATCH_NO;
}
 
#undef RETM
 
 
match
gfc_match_inquire (void)
{
  gfc_inquire *inquire;
  gfc_code *code;
  match m;
  locus loc;
 
  m = gfc_match_char ('(');
  if (m == MATCH_NO)
    return m;
 
  inquire = gfc_getmem (sizeof (gfc_inquire));
 
  loc = gfc_current_locus;
 
  m = match_inquire_element (inquire);
  if (m == MATCH_ERROR)
    goto cleanup;
  if (m == MATCH_NO)
    {
      m = gfc_match_expr (&inquire->unit);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
    }
 
  /* See if we have the IOLENGTH form of the inquire statement.  */
  if (inquire->iolength != NULL)
    {
      if (gfc_match_char (')') != MATCH_YES)
        goto syntax;
 
      m = match_io_list (M_INQUIRE, &code);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
 
      new_st.op = EXEC_IOLENGTH;
      new_st.expr = inquire->iolength;
      new_st.ext.inquire = inquire;
 
      if (gfc_pure (NULL))
        {
          gfc_free_statements (code);
          gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
          return MATCH_ERROR;
        }
 
      new_st.block = gfc_get_code ();
      new_st.block->op = EXEC_IOLENGTH;
      terminate_io (code);
      new_st.block->next = code;
      return MATCH_YES;
    }
 
  /* At this point, we have the non-IOLENGTH inquire statement.  */
  for (;;)
    {
      if (gfc_match_char (')') == MATCH_YES)
        break;
      if (gfc_match_char (',') != MATCH_YES)
        goto syntax;
 
      m = match_inquire_element (inquire);
      if (m == MATCH_ERROR)
        goto cleanup;
      if (m == MATCH_NO)
        goto syntax;
 
      if (inquire->iolength != NULL)
        {
          gfc_error ("IOLENGTH tag invalid in INQUIRE statement at %C");
          goto cleanup;
        }
    }
 
  if (gfc_match_eos () != MATCH_YES)
    goto syntax;
 
  if (inquire->unit != NULL && inquire->file != NULL)
    {
      gfc_error ("INQUIRE statement at %L cannot contain both FILE and"
                 " UNIT specifiers", &loc);
      goto cleanup;
    }
 
  if (inquire->unit == NULL && inquire->file == NULL)
    {
      gfc_error ("INQUIRE statement at %L requires either FILE or"
                     " UNIT specifier", &loc);
      goto cleanup;
    }
 
  if (gfc_pure (NULL))
    {
      gfc_error ("INQUIRE statement not allowed in PURE procedure at %C");
      goto cleanup;
    }
 
  new_st.op = EXEC_INQUIRE;
  new_st.ext.inquire = inquire;
  return MATCH_YES;
 
syntax:
  gfc_syntax_error (ST_INQUIRE);
 
cleanup:
  gfc_free_inquire (inquire);
  return MATCH_ERROR;
}
 
 
/* Resolve everything in a gfc_inquire structure.  */
 
try
gfc_resolve_inquire (gfc_inquire * inquire)
{
 
  RESOLVE_TAG (&tag_unit, inquire->unit);
  RESOLVE_TAG (&tag_file, inquire->file);
  RESOLVE_TAG (&tag_iomsg, inquire->iomsg);
  RESOLVE_TAG (&tag_iostat, inquire->iostat);
  RESOLVE_TAG (&tag_exist, inquire->exist);
  RESOLVE_TAG (&tag_opened, inquire->opened);
  RESOLVE_TAG (&tag_number, inquire->number);
  RESOLVE_TAG (&tag_named, inquire->named);
  RESOLVE_TAG (&tag_name, inquire->name);
  RESOLVE_TAG (&tag_s_access, inquire->access);
  RESOLVE_TAG (&tag_sequential, inquire->sequential);
  RESOLVE_TAG (&tag_direct, inquire->direct);
  RESOLVE_TAG (&tag_s_form, inquire->form);
  RESOLVE_TAG (&tag_formatted, inquire->formatted);
  RESOLVE_TAG (&tag_unformatted, inquire->unformatted);
  RESOLVE_TAG (&tag_s_recl, inquire->recl);
  RESOLVE_TAG (&tag_nextrec, inquire->nextrec);
  RESOLVE_TAG (&tag_s_blank, inquire->blank);
  RESOLVE_TAG (&tag_s_position, inquire->position);
  RESOLVE_TAG (&tag_s_action, inquire->action);
  RESOLVE_TAG (&tag_read, inquire->read);
  RESOLVE_TAG (&tag_write, inquire->write);
  RESOLVE_TAG (&tag_readwrite, inquire->readwrite);
  RESOLVE_TAG (&tag_s_delim, inquire->delim);
  RESOLVE_TAG (&tag_s_pad, inquire->pad);
  RESOLVE_TAG (&tag_iolength, inquire->iolength);
  RESOLVE_TAG (&tag_convert, inquire->convert);
 
  if (gfc_reference_st_label (inquire->err, ST_LABEL_TARGET) == FAILURE)
    return FAILURE;
 
  return SUCCESS;
}
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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [fortran/] [io.c] - Blame information for rev 20

Line No.	Rev	Author	Line
1	12	jlechner	`/* Deal with I/O statements & related stuff.`
2			`Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,`
3			`Inc.`
4			`Contributed by Andy Vaught`
5
6			`This file is part of GCC.`
7
8			`GCC is free software; you can redistribute it and/or modify it under`
9			`the terms of the GNU General Public License as published by the Free`
10			`Software Foundation; either version 2, or (at your option) any later`
11			`version.`
12
13			`GCC is distributed in the hope that it will be useful, but WITHOUT ANY`
14			`WARRANTY; without even the implied warranty of MERCHANTABILITY or`
15			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
16			`for more details.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with GCC; see the file COPYING. If not, write to the Free`
20			`Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA`
21			`02110-1301, USA. */`
22
23			`#include "config.h"`
24			`#include "system.h"`
25			`#include "flags.h"`
26			`#include "gfortran.h"`
27			`#include "match.h"`
28			`#include "parse.h"`
29
30			`gfc_st_label format_asterisk =`
31			`{ -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL, 0,`
32			`{NULL, NULL}, NULL, NULL};`
33
34			`typedef struct`
35			`{`
36			`const char name, spec;`
37			`bt type;`
38			`}`
39			`io_tag;`
40