gcc/f/ste.c

/* ste.c -- Implementation File (module.c template V1.0)
   Copyright (C) 1995, 1996, 2000, 2002, 2003 Free Software Foundation, Inc.
   Contributed by James Craig Burley.

This file is part of GNU Fortran.

GNU Fortran 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.

GNU Fortran 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 GNU Fortran; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.

   Related Modules:
      ste.c

   Description:
      Implements the various statements and such like.

   Modifications:
*/

/* Include files. */

#include "proj.h"
#include "rtl.h"
#include "toplev.h"
#include "ggc.h"
#include "ste.h"
#include "bld.h"
#include "com.h"
#include "expr.h"
#include "lab.h"
#include "lex.h"
#include "sta.h"
#include "stp.h"
#include "str.h"
#include "sts.h"
#include "stt.h"
#include "stv.h"
#include "stw.h"
#include "symbol.h"

/* Externals defined here. */


/* Simple definitions and enumerations. */

typedef enum
  {
    FFESTE_stateletSIMPLE_,	/* Expecting simple/start. */
    FFESTE_stateletATTRIB_,	/* Expecting attrib/item/itemstart. */
    FFESTE_stateletITEM_,	/* Expecting item/itemstart/finish. */
    FFESTE_stateletITEMVALS_,	/* Expecting itemvalue/itemendvals. */
    FFESTE_
  } ffesteStatelet_;

/* Internal typedefs. */


/* Private include files. */


/* Internal structure definitions. */


/* Static objects accessed by functions in this module. */

static ffesteStatelet_ ffeste_statelet_ = FFESTE_stateletSIMPLE_;
static ffelab ffeste_label_formatdef_ = NULL;
static tree (*ffeste_io_driver_) (ffebld expr);	/* do?io. */
static ffecomGfrt ffeste_io_endgfrt_;	/* end function to call. */
static tree ffeste_io_abort_;	/* abort-io label or NULL_TREE. */
static bool ffeste_io_abort_is_temp_;	/* abort-io label is a temp. */
static tree ffeste_io_end_;	/* END= label or NULL_TREE. */
static tree ffeste_io_err_;	/* ERR= label or NULL_TREE. */
static tree ffeste_io_iostat_;	/* IOSTAT= var or NULL_TREE. */
static bool ffeste_io_iostat_is_temp_;	/* IOSTAT= var is a temp. */

/* Static functions (internal). */

static void ffeste_begin_iterdo_ (ffestw block, tree *tvar, tree *tincr,
				  tree *xitersvar, ffebld var,
				  ffebld start, ffelexToken start_token,
				  ffebld end, ffelexToken end_token,
				  ffebld incr, ffelexToken incr_token,
				  const char *msg);
static void ffeste_end_iterdo_ (ffestw block, tree tvar, tree tincr,
				tree itersvar);
static void ffeste_io_call_ (tree call, bool do_check);
static void ffeste_io_impdo_ (ffebld impdo, ffelexToken impdo_token);
static tree ffeste_io_dofio_ (ffebld expr);
static tree ffeste_io_dolio_ (ffebld expr);
static tree ffeste_io_douio_ (ffebld expr);
static tree ffeste_io_ialist_ (bool have_err, ffestvUnit unit,
			       ffebld unit_expr, int unit_dflt);
static tree ffeste_io_cilist_ (bool have_err, ffestvUnit unit,
			       ffebld unit_expr, int unit_dflt,
			       bool have_end, ffestvFormat format,
			       ffestpFile *format_spec, bool rec,
			       ffebld rec_expr);
static tree ffeste_io_cllist_ (bool have_err, ffebld unit_expr,
			       ffestpFile *stat_spec);
static tree ffeste_io_icilist_ (bool have_err, ffebld unit_expr,
				bool have_end, ffestvFormat format,
				ffestpFile *format_spec);
static tree ffeste_io_inlist_ (bool have_err,
			       ffestpFile *unit_spec,
			       ffestpFile *file_spec,
			       ffestpFile *exist_spec,
			       ffestpFile *open_spec,
			       ffestpFile *number_spec,
			       ffestpFile *named_spec,
			       ffestpFile *name_spec,
			       ffestpFile *access_spec,
			       ffestpFile *sequential_spec,
			       ffestpFile *direct_spec,
			       ffestpFile *form_spec,
			       ffestpFile *formatted_spec,
			       ffestpFile *unformatted_spec,
			       ffestpFile *recl_spec,
			       ffestpFile *nextrec_spec,
			       ffestpFile *blank_spec);
static tree ffeste_io_olist_ (bool have_err, ffebld unit_expr,
			      ffestpFile *file_spec,
			      ffestpFile *stat_spec,
			      ffestpFile *access_spec,
			      ffestpFile *form_spec,
			      ffestpFile *recl_spec,
			      ffestpFile *blank_spec);
static void ffeste_subr_beru_ (ffestpBeruStmt *info, ffecomGfrt rt);

/* Internal macros. */

#define ffeste_emit_line_note_() \
  emit_line_note (input_location)
#define ffeste_check_simple_() \
  assert(ffeste_statelet_ == FFESTE_stateletSIMPLE_)
#define ffeste_check_start_() \
  assert(ffeste_statelet_ == FFESTE_stateletSIMPLE_); \
  ffeste_statelet_ = FFESTE_stateletATTRIB_
#define ffeste_check_attrib_() \
  assert(ffeste_statelet_ == FFESTE_stateletATTRIB_)
#define ffeste_check_item_() \
  assert(ffeste_statelet_ == FFESTE_stateletATTRIB_	 \
	 || ffeste_statelet_ == FFESTE_stateletITEM_); \
  ffeste_statelet_ = FFESTE_stateletITEM_
#define ffeste_check_item_startvals_() \
  assert(ffeste_statelet_ == FFESTE_stateletATTRIB_	 \
	 || ffeste_statelet_ == FFESTE_stateletITEM_); \
  ffeste_statelet_ = FFESTE_stateletITEMVALS_
#define ffeste_check_item_value_() \
  assert(ffeste_statelet_ == FFESTE_stateletITEMVALS_)
#define ffeste_check_item_endvals_() \
  assert(ffeste_statelet_ == FFESTE_stateletITEMVALS_); \
  ffeste_statelet_ = FFESTE_stateletITEM_
#define ffeste_check_finish_() \
  assert(ffeste_statelet_ == FFESTE_stateletATTRIB_	 \
	 || ffeste_statelet_ == FFESTE_stateletITEM_); \
  ffeste_statelet_ = FFESTE_stateletSIMPLE_

#define ffeste_f2c_init_charnolen_(Exp,Init,Spec)			      \
  do									      \
    {									      \
      if ((Spec)->kw_or_val_present)					      \
	Exp = ffecom_arg_ptr_to_const_expr ((Spec)->u.expr, &ignore);	      \
      else								      \
	Exp = null_pointer_node;					      \
      if (Exp)								      \
	Init = Exp;							      \
      else								      \
	{								      \
	  Init = null_pointer_node;					      \
	  constantp = FALSE;						      \
	}								      \
    } while(0)

#define ffeste_f2c_init_char_(Exp,Init,Lenexp,Leninit,Spec)		      \
  do									      \
    {									      \
      if ((Spec)->kw_or_val_present)					      \
	Exp = ffecom_arg_ptr_to_const_expr ((Spec)->u.expr, &Lenexp);	      \
      else								      \
	{								      \
	  Exp = null_pointer_node;					      \
	  Lenexp = ffecom_f2c_ftnlen_zero_node;				      \
	}								      \
      if (Exp)								      \
	Init = Exp;							      \
      else								      \
	{								      \
	  Init = null_pointer_node;					      \
	  constantp = FALSE;						      \
	}								      \
      if (Lenexp)							      \
	Leninit = Lenexp;						      \
      else								      \
	{								      \
	  Leninit = ffecom_f2c_ftnlen_zero_node;			      \
	  constantp = FALSE;						      \
	}								      \
    } while(0)

#define ffeste_f2c_init_flag_(Flag,Init)				      \
  do									      \
    {									      \
      Init = convert (ffecom_f2c_flag_type_node,			      \
		      (Flag) ? integer_one_node : integer_zero_node);	      \
    } while(0)

#define ffeste_f2c_init_format_(Exp,Init,Spec)				      \
  do									      \
    {									      \
      Exp = ffecom_arg_ptr_to_const_expr ((Spec)->u.expr, NULL);	      \
      if (Exp)								      \
	Init = Exp;							      \
      else								      \
	{								      \
	  Init = null_pointer_node;					      \
	  constantp = FALSE;						      \
	}								      \
    } while(0)

#define ffeste_f2c_init_int_(Exp,Init,Spec)				      \
  do									      \
    {									      \
      if ((Spec)->kw_or_val_present)					      \
	Exp = ffecom_const_expr ((Spec)->u.expr);			      \
      else								      \
	Exp = ffecom_integer_zero_node;					      \
      if (Exp)								      \
	Init = Exp;							      \
      else								      \
	{								      \
	  Init = ffecom_integer_zero_node;				      \
	  constantp = FALSE;						      \
	}								      \
    } while(0)

#define ffeste_f2c_init_ptrtoint_(Exp,Init,Spec)			      \
  do									      \
    {									      \
      if ((Spec)->kw_or_val_present)					      \
	Exp = ffecom_ptr_to_const_expr ((Spec)->u.expr);		      \
      else								      \
	Exp = null_pointer_node;					      \
      if (Exp)								      \
	Init = Exp;							      \
      else								      \
	{								      \
	  Init = null_pointer_node;					      \
	  constantp = FALSE;						      \
	}								      \
    } while(0)

#define ffeste_f2c_init_next_(Init)					      \
  do									      \
    {									      \
      TREE_CHAIN (initn) = build_tree_list ((field = TREE_CHAIN (field)),     \
					    (Init));			      \
      initn = TREE_CHAIN(initn);					      \
    } while(0)

#define ffeste_f2c_prepare_charnolen_(Spec,Exp)				      \
  do									      \
    {									      \
      if (! (Exp))							      \
        ffecom_prepare_arg_ptr_to_expr ((Spec)->u.expr);		      \
    } while(0)

#define ffeste_f2c_prepare_char_(Spec,Exp)				      \
  do									      \
    {									      \
      if (! (Exp))							      \
        ffecom_prepare_arg_ptr_to_expr ((Spec)->u.expr);		      \
    } while(0)

#define ffeste_f2c_prepare_format_(Spec,Exp)				      \
  do									      \
    {									      \
      if (! (Exp))							      \
        ffecom_prepare_arg_ptr_to_expr ((Spec)->u.expr);		      \
    } while(0)

#define ffeste_f2c_prepare_int_(Spec,Exp)				      \
  do									      \
    {									      \
      if (! (Exp))							      \
        ffecom_prepare_expr ((Spec)->u.expr);				      \
    } while(0)

#define ffeste_f2c_prepare_ptrtoint_(Spec,Exp)				      \
  do									      \
    {									      \
      if (! (Exp))							      \
        ffecom_prepare_ptr_to_expr ((Spec)->u.expr);			      \
    } while(0)

#define ffeste_f2c_compile_(Field,Exp)					      \
  do									      \
    {									      \
      tree exz;								      \
      if ((Exp))							      \
	{								      \
	  exz = ffecom_modify (void_type_node,				      \
			       ffecom_2 (COMPONENT_REF, TREE_TYPE (Field),    \
					 t, (Field)),			      \
			       (Exp));					      \
	  expand_expr_stmt (exz);					      \
	}								      \
    } while(0)

#define ffeste_f2c_compile_charnolen_(Field,Spec,Exp)			      \
  do									      \
    {									      \
      tree exq;								      \
      if (! (Exp))							      \
	{								      \
	  exq = ffecom_arg_ptr_to_expr ((Spec)->u.expr, &ignore);	      \
	  ffeste_f2c_compile_ ((Field), exq);				      \
	}								      \
    } while(0)

#define ffeste_f2c_compile_char_(Field,Lenfield,Spec,Exp,Lenexp)	      \
  do									      \
    {									      \
      tree exq = (Exp);							      \
      tree lenexq = (Lenexp);						      \
      int need_exq = (! exq);						      \
      int need_lenexq = (! lenexq);					      \
      if (need_exq || need_lenexq)					      \
	{								      \
	  exq = ffecom_arg_ptr_to_expr ((Spec)->u.expr, &lenexq);	      \
	  if (need_exq)							      \
	    ffeste_f2c_compile_ ((Field), exq);				      \
	  if (need_lenexq)						      \
	    ffeste_f2c_compile_ ((Lenfield), lenexq);			      \
	}								      \
    } while(0)

#define ffeste_f2c_compile_format_(Field,Spec,Exp)			      \
  do									      \
    {									      \
      tree exq;								      \
      if (! (Exp))							      \
	{								      \
	  exq = ffecom_arg_ptr_to_expr ((Spec)->u.expr, NULL);		      \
	  ffeste_f2c_compile_ ((Field), exq);				      \
	}								      \
    } while(0)

#define ffeste_f2c_compile_int_(Field,Spec,Exp)				      \
  do									      \
    {									      \
      tree exq;								      \
      if (! (Exp))							      \
	{								      \
	  exq = ffecom_expr ((Spec)->u.expr);				      \
	  ffeste_f2c_compile_ ((Field), exq);				      \
	}								      \
    } while(0)

#define ffeste_f2c_compile_ptrtoint_(Field,Spec,Exp)			      \
  do									      \
    {									      \
      tree exq;								      \
      if (! (Exp))							      \
	{								      \
	  exq = ffecom_ptr_to_expr ((Spec)->u.expr);			      \
	  ffeste_f2c_compile_ ((Field), exq);				      \
	}								      \
    } while(0)

/* Start a Fortran block.  */

#ifdef ENABLE_CHECKING

typedef struct gbe_block
{
  struct gbe_block *outer;
  ffestw block;
  location_t location;
  bool is_stmt;
} *gbe_block;

gbe_block ffeste_top_block_ = NULL;

static void
ffeste_start_block_ (ffestw block)
{
  gbe_block b = xmalloc (sizeof (*b));

  b->outer = ffeste_top_block_;
  b->block = block;
  b->location = input_location;
  b->is_stmt = FALSE;

  ffeste_top_block_ = b;

  ffecom_start_compstmt ();
}

/* End a Fortran block.  */

static void
ffeste_end_block_ (ffestw block)
{
  gbe_block b = ffeste_top_block_;

  assert (b);
  assert (! b->is_stmt);
  assert (b->block == block);
  assert (! b->is_stmt);

  ffeste_top_block_ = b->outer;

  free (b);

  ffecom_end_compstmt ();
}

/* Start a Fortran statement.

   Starts a back-end block, so temporaries can be managed, clean-ups
   properly handled, etc.  Nesting of statements *is* allowed -- the
   handling of I/O items, even implied-DO I/O lists, within a READ,
   PRINT, or WRITE statement is one example.  */

static void
ffeste_start_stmt_(void)
{
  gbe_block b = xmalloc (sizeof (*b));

  b->outer = ffeste_top_block_;
  b->block = NULL;
  b->location = input_location;
  b->is_stmt = TRUE;

  ffeste_top_block_ = b;

  ffecom_start_compstmt ();
}

/* End a Fortran statement.  */

static void
ffeste_end_stmt_(void)
{
  gbe_block b = ffeste_top_block_;

  assert (b);
  assert (b->is_stmt);

  ffeste_top_block_ = b->outer;

  free (b);

  ffecom_end_compstmt ();
}

#else  /* ! defined (ENABLE_CHECKING) */

#define ffeste_start_block_(b) ffecom_start_compstmt ()
#define ffeste_end_block_(b)	\
  do				\
    {				\
      ffecom_end_compstmt ();	\
    } while(0)
#define ffeste_start_stmt_() ffeste_start_block_(NULL)
#define ffeste_end_stmt_() ffeste_end_block_(NULL)

#endif  /* ! defined (ENABLE_CHECKING) */

/* Begin an iterative DO loop.  Pass the block to start if
   applicable.  */

static void
ffeste_begin_iterdo_ (ffestw block, tree *xtvar, tree *xtincr,
		      tree *xitersvar, ffebld var,
		      ffebld start, ffelexToken start_token,
		      ffebld end, ffelexToken end_token,
		      ffebld incr, ffelexToken incr_token,
		      const char *msg)
{
  tree tvar;
  tree expr;
  tree tstart;
  tree tend;
  tree tincr;
  tree tincr_saved;
  tree niters;
  struct nesting *expanded_loop;

  /* Want to have tvar, tincr, and niters for the whole loop body. */

  if (block)
    ffeste_start_block_ (block);
  else
    ffeste_start_stmt_ ();

  niters = ffecom_make_tempvar (block ? "do" : "impdo",
				ffecom_integer_type_node,
				FFETARGET_charactersizeNONE, -1);

  ffecom_prepare_expr (incr);
  ffecom_prepare_expr_rw (NULL_TREE, var);

  ffecom_prepare_end ();

  tvar = ffecom_expr_rw (NULL_TREE, var);
  tincr = ffecom_expr (incr);

  if (TREE_CODE (tvar) == ERROR_MARK
      || TREE_CODE (tincr) == ERROR_MARK)
    {
      if (block)
	{
	  ffeste_end_block_ (block);
	  ffestw_set_do_tvar (block, error_mark_node);
	}
      else
	{
	  ffeste_end_stmt_ ();
	  *xtvar = error_mark_node;
	}
      return;
    }

  /* Check whether incr is known to be zero, complain and fix.  */

  if (integer_zerop (tincr) || real_zerop (tincr))
    {
      ffebad_start (FFEBAD_DO_STEP_ZERO);
      ffebad_here (0, ffelex_token_where_line (incr_token),
		   ffelex_token_where_column (incr_token));
      ffebad_string (msg);
      ffebad_finish ();
      tincr = convert (TREE_TYPE (tvar), integer_one_node);
    }

  tincr_saved = ffecom_save_tree (tincr);

  /* Want to have tstart, tend for just this statement. */

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (start);
  ffecom_prepare_expr (end);

  ffecom_prepare_end ();

  tstart = ffecom_expr (start);
  tend = ffecom_expr (end);

  if (TREE_CODE (tstart) == ERROR_MARK
      || TREE_CODE (tend) == ERROR_MARK)
    {
      ffeste_end_stmt_ ();

      if (block)
	{
	  ffeste_end_block_ (block);
	  ffestw_set_do_tvar (block, error_mark_node);
	}
      else
	{
	  ffeste_end_stmt_ ();
	  *xtvar = error_mark_node;
	}
      return;
    }

  /* For warnings only, nothing else happens here.  */
  {
    tree try;

    if (! ffe_is_onetrip ())
      {
	try = ffecom_2 (MINUS_EXPR, TREE_TYPE (tvar),
			tend,
			tstart);

	try = ffecom_2 (PLUS_EXPR, TREE_TYPE (tvar),
			try,
			tincr);

	if (TREE_CODE (TREE_TYPE (tvar)) != REAL_TYPE)
	  try = ffecom_2 (TRUNC_DIV_EXPR, integer_type_node, try,
			  tincr);
	else
	  try = convert (integer_type_node,
			 ffecom_2 (RDIV_EXPR, TREE_TYPE (tvar),
				   try,
				   tincr));

	/* Warn if loop never executed, since we've done the evaluation
	   of the unofficial iteration count already.  */

	try = ffecom_truth_value (ffecom_2 (LE_EXPR, integer_type_node,
					    try,
					    convert (TREE_TYPE (tvar),
						     integer_zero_node)));

	if (integer_onep (try))
	  {
	    ffebad_start (FFEBAD_DO_NULL);
	    ffebad_here (0, ffelex_token_where_line (start_token),
			 ffelex_token_where_column (start_token));
	    ffebad_string (msg);
	    ffebad_finish ();
	  }
      }

    /* Warn if end plus incr would overflow.  */

    try = ffecom_2 (PLUS_EXPR, TREE_TYPE (tvar),
		    tend,
		    tincr);

    if ((TREE_CODE_CLASS (TREE_CODE (try)) == 'c')
	&& TREE_CONSTANT_OVERFLOW (try))
      {
	ffebad_start (FFEBAD_DO_END_OVERFLOW);
	ffebad_here (0, ffelex_token_where_line (end_token),
		     ffelex_token_where_column (end_token));
	ffebad_string (msg);
	ffebad_finish ();
      }
  }

  /* Do the initial assignment into the DO var.  */

  tstart = ffecom_save_tree (tstart);

  expr = ffecom_2 (MINUS_EXPR, TREE_TYPE (tvar),
		   tend,
		   tstart);

  if (! ffe_is_onetrip ())
    {
      expr = ffecom_2 (PLUS_EXPR, TREE_TYPE (expr),
		       expr,
		       convert (TREE_TYPE (expr), tincr_saved));
    }

  if (TREE_CODE (TREE_TYPE (tvar)) != REAL_TYPE)
    expr = ffecom_2 (TRUNC_DIV_EXPR, TREE_TYPE (expr),
		     expr,
		     tincr_saved);
  else
    expr = ffecom_2 (RDIV_EXPR, TREE_TYPE (expr),
		     expr,
		     tincr_saved);

#if 1	/* New, F90-approved approach: convert to default INTEGER. */
  if (TREE_TYPE (tvar) != error_mark_node)
    expr = convert (ffecom_integer_type_node, expr);
#else	/* Old approach; convert to INTEGER unless that's a narrowing. */
  if ((TREE_TYPE (tvar) != error_mark_node)
      && ((TREE_CODE (TREE_TYPE (tvar)) != INTEGER_TYPE)
	  || ((TYPE_SIZE (TREE_TYPE (tvar)) != NULL_TREE)
	      && ((TREE_CODE (TYPE_SIZE (TREE_TYPE (tvar)))
		   != INTEGER_CST)
		  || (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (tvar)))
		      <= TREE_INT_CST_LOW (TYPE_SIZE (ffecom_integer_type_node)))))))
    /* Convert unless promoting INTEGER type of any kind downward to
       default INTEGER; else leave as, say, INTEGER*8 (long long int).  */
    expr = convert (ffecom_integer_type_node, expr);
#endif

  assert (TYPE_MAIN_VARIANT (TREE_TYPE (niters))
	  == TYPE_MAIN_VARIANT (TREE_TYPE (expr)));

  expr = ffecom_modify (void_type_node, niters, expr);
  expand_expr_stmt (expr);

  expr = ffecom_modify (void_type_node, tvar, tstart);
  expand_expr_stmt (expr);

  ffeste_end_stmt_ ();

  expanded_loop = expand_start_loop_continue_elsewhere (!! block);
  if (block)
    ffestw_set_do_hook (block, expanded_loop);

  if (! ffe_is_onetrip ())
    {
      expr = ffecom_truth_value
	(ffecom_2 (GE_EXPR, integer_type_node,
		   ffecom_2 (PREDECREMENT_EXPR,
			     TREE_TYPE (niters),
			     niters,
			     convert (TREE_TYPE (niters),
				      ffecom_integer_one_node)),
		   convert (TREE_TYPE (niters),
			    ffecom_integer_zero_node)));

      expand_exit_loop_top_cond (0, expr);
    }

  if (block)
    {
      ffestw_set_do_tvar (block, tvar);
      ffestw_set_do_incr_saved (block, tincr_saved);
      ffestw_set_do_count_var (block, niters);
    }
  else
    {
      *xtvar = tvar;
      *xtincr = tincr_saved;
      *xitersvar = niters;
    }
}

/* End an iterative DO loop.  Pass the same iteration variable and increment
   value trees that were generated in the paired _begin_ call.  */

static void
ffeste_end_iterdo_ (ffestw block, tree tvar, tree tincr, tree itersvar)
{
  tree expr;
  tree niters = itersvar;

  if (tvar == error_mark_node)
    return;

  expand_loop_continue_here ();

  ffeste_start_stmt_ ();

  if (ffe_is_onetrip ())
    {
      expr = ffecom_truth_value
	(ffecom_2 (GE_EXPR, integer_type_node,
		   ffecom_2 (PREDECREMENT_EXPR,
			     TREE_TYPE (niters),
			     niters,
			     convert (TREE_TYPE (niters),
				      ffecom_integer_one_node)),
		   convert (TREE_TYPE (niters),
			    ffecom_integer_zero_node)));

      expand_exit_loop_if_false (0, expr);
    }

  expr = ffecom_modify (void_type_node, tvar,
			ffecom_2 (PLUS_EXPR, TREE_TYPE (tvar),
				  tvar,
				  tincr));
  expand_expr_stmt (expr);

  /* Lose the stuff we just built. */
  ffeste_end_stmt_ ();

  expand_end_loop ();

  /* Lose the tvar and incr_saved trees. */
  if (block)
    ffeste_end_block_ (block);
  else
    ffeste_end_stmt_ ();
}

/* Generate call to run-time I/O routine.  */

static void
ffeste_io_call_ (tree call, bool do_check)
{
  /* Generate the call and optional assignment into iostat var. */

  TREE_SIDE_EFFECTS (call) = 1;
  if (ffeste_io_iostat_ != NULL_TREE)
    call = ffecom_modify (do_check ? NULL_TREE : void_type_node,
			  ffeste_io_iostat_, call);
  expand_expr_stmt (call);

  if (! do_check
      || ffeste_io_abort_ == NULL_TREE
      || TREE_CODE (ffeste_io_abort_) == ERROR_MARK)
    return;

  /* Generate optional test. */

  expand_start_cond (ffecom_truth_value (ffeste_io_iostat_), 0);
  expand_goto (ffeste_io_abort_);
  expand_end_cond ();
}

/* Handle implied-DO in I/O list.

   Expands code to start up the DO loop.  Then for each item in the
   DO loop, handles appropriately (possibly including recursively calling
   itself).  Then expands code to end the DO loop.  */

static void
ffeste_io_impdo_ (ffebld impdo, ffelexToken impdo_token)
{
  ffebld var = ffebld_head (ffebld_right (impdo));
  ffebld start = ffebld_head (ffebld_trail (ffebld_right (impdo)));
  ffebld end = ffebld_head (ffebld_trail (ffebld_trail
					  (ffebld_right (impdo))));
  ffebld incr = ffebld_head (ffebld_trail (ffebld_trail
				    (ffebld_trail (ffebld_right (impdo)))));
  ffebld list;
  ffebld item;
  tree tvar;
  tree tincr;
  tree titervar;

  if (incr == NULL)
    {
      incr = ffebld_new_conter (ffebld_constant_new_integerdefault_val (1));
      ffebld_set_info (incr, ffeinfo_new
		       (FFEINFO_basictypeINTEGER,
			FFEINFO_kindtypeINTEGERDEFAULT,
			0,
			FFEINFO_kindENTITY,
			FFEINFO_whereCONSTANT,
			FFETARGET_charactersizeNONE));
    }

  /* Start the DO loop.  */

  start = ffeexpr_convert_expr (start, impdo_token, var, impdo_token,
				FFEEXPR_contextLET);
  end = ffeexpr_convert_expr (end, impdo_token, var, impdo_token,
			      FFEEXPR_contextLET);
  incr = ffeexpr_convert_expr (incr, impdo_token, var, impdo_token,
			       FFEEXPR_contextLET);

  ffeste_begin_iterdo_ (NULL, &tvar, &tincr, &titervar, var,
			start, impdo_token,
			end, impdo_token,
			incr, impdo_token,
			"Implied DO loop");

  /* Handle the list of items.  */

  for (list = ffebld_left (impdo); list != NULL; list = ffebld_trail (list))
    {
      item = ffebld_head (list);
      if (item == NULL)
	continue;

      /* Strip parens off items such as in "READ *,(A)".  This is really a bug
	 in the user's code, but I've been told lots of code does this.  */
      while (ffebld_op (item) == FFEBLD_opPAREN)
	item = ffebld_left (item);

      if (ffebld_op (item) == FFEBLD_opANY)
	continue;

      if (ffebld_op (item) == FFEBLD_opIMPDO)
	ffeste_io_impdo_ (item, impdo_token);
      else
	{
	  ffeste_start_stmt_ ();

	  ffecom_prepare_arg_ptr_to_expr (item);

	  ffecom_prepare_end ();

	  ffeste_io_call_ ((*ffeste_io_driver_) (item), TRUE);

	  ffeste_end_stmt_ ();
	}
    }

  /* Generate end of implied-do construct. */

  ffeste_end_iterdo_ (NULL, tvar, tincr, titervar);
}

/* I/O driver for formatted I/O item (do_fio)

   Returns a tree for a CALL_EXPR to the do_fio function, which handles
   a formatted I/O list item, along with the appropriate arguments for
   the function.  It is up to the caller to set the TREE_SIDE_EFFECTS flag
   for the CALL_EXPR, expand (emit) the expression, emit any assignment
   of the result to an IOSTAT= variable, and emit any checking of the
   result for errors.  */

static tree
ffeste_io_dofio_ (ffebld expr)
{
  tree num_elements;
  tree variable;
  tree size;
  tree arglist;
  ffeinfoBasictype bt;
  ffeinfoKindtype kt;
  bool is_complex;

  bt = ffeinfo_basictype (ffebld_info (expr));
  kt = ffeinfo_kindtype (ffebld_info (expr));

  if ((bt == FFEINFO_basictypeANY)
      || (kt == FFEINFO_kindtypeANY))
    return error_mark_node;

  if (bt == FFEINFO_basictypeCOMPLEX)
    {
      is_complex = TRUE;
      bt = FFEINFO_basictypeREAL;
    }
  else
    is_complex = FALSE;

  variable = ffecom_arg_ptr_to_expr (expr, &size);

  if ((variable == error_mark_node)
      || (size == error_mark_node))
    return error_mark_node;

  if (size == NULL_TREE)	/* Already filled in for CHARACTER type. */
    {				/* "(ftnlen) sizeof(type)" */
      size = size_binop (CEIL_DIV_EXPR,
			 TYPE_SIZE_UNIT (ffecom_tree_type[bt][kt]),
			 size_int (TYPE_PRECISION (char_type_node)
				   / BITS_PER_UNIT));
#if 0	/* Assume that while it is possible that char * is wider than
	   ftnlen, no object in Fortran space can get big enough for its
	   size to be wider than ftnlen.  I really hope nobody wastes
	   time debugging a case where it can!  */
      assert (TYPE_PRECISION (ffecom_f2c_ftnlen_type_node)
	      >= TYPE_PRECISION (TREE_TYPE (size)));
#endif
      size = convert (ffecom_f2c_ftnlen_type_node, size);
    }

  if (ffeinfo_rank (ffebld_info (expr)) == 0
      || TREE_CODE (TREE_TYPE (TREE_TYPE (variable))) != ARRAY_TYPE)
    num_elements
      = is_complex ? ffecom_f2c_ftnlen_two_node : ffecom_f2c_ftnlen_one_node;
  else
    {
      num_elements
	= size_binop (CEIL_DIV_EXPR,
		      TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (variable))),
		      convert (sizetype, size));
      num_elements = size_binop (CEIL_DIV_EXPR, num_elements,
				 size_int (TYPE_PRECISION (char_type_node)
					   / BITS_PER_UNIT));
      num_elements = convert (ffecom_f2c_ftnlen_type_node,
			      num_elements);
    }

  num_elements
    = ffecom_1 (ADDR_EXPR, ffecom_f2c_ptr_to_ftnlen_type_node,
		num_elements);

  variable = convert (string_type_node, variable);

  arglist = build_tree_list (NULL_TREE, num_elements);
  TREE_CHAIN (arglist) = build_tree_list (NULL_TREE, variable);
  TREE_CHAIN (TREE_CHAIN (arglist)) = build_tree_list (NULL_TREE, size);

  return ffecom_call_gfrt (FFECOM_gfrtDOFIO, arglist, NULL_TREE);
}

/* I/O driver for list-directed I/O item (do_lio)

   Returns a tree for a CALL_EXPR to the do_lio function, which handles
   a list-directed I/O list item, along with the appropriate arguments for
   the function.  It is up to the caller to set the TREE_SIDE_EFFECTS flag
   for the CALL_EXPR, expand (emit) the expression, emit any assignment
   of the result to an IOSTAT= variable, and emit any checking of the
   result for errors.  */

static tree
ffeste_io_dolio_ (ffebld expr)
{
  tree type_id;
  tree num_elements;
  tree variable;
  tree size;
  tree arglist;
  ffeinfoBasictype bt;
  ffeinfoKindtype kt;
  int tc;

  bt = ffeinfo_basictype (ffebld_info (expr));
  kt = ffeinfo_kindtype (ffebld_info (expr));

  if ((bt == FFEINFO_basictypeANY)
      || (kt == FFEINFO_kindtypeANY))
    return error_mark_node;

  tc = ffecom_f2c_typecode (bt, kt);
  assert (tc != -1);
  type_id = build_int_2 (tc, 0);

  type_id
    = ffecom_1 (ADDR_EXPR, ffecom_f2c_ptr_to_ftnint_type_node,
		convert (ffecom_f2c_ftnint_type_node,
			 type_id));

  variable = ffecom_arg_ptr_to_expr (expr, &size);

  if ((type_id == error_mark_node)
      || (variable == error_mark_node)
      || (size == error_mark_node))
    return error_mark_node;

  if (size == NULL_TREE)	/* Already filled in for CHARACTER type. */
    {				/* "(ftnlen) sizeof(type)" */
      size = size_binop (CEIL_DIV_EXPR,
			 TYPE_SIZE_UNIT (ffecom_tree_type[bt][kt]),
			 size_int (TYPE_PRECISION (char_type_node)
				   / BITS_PER_UNIT));
#if 0	/* Assume that while it is possible that char * is wider than
	   ftnlen, no object in Fortran space can get big enough for its
	   size to be wider than ftnlen.  I really hope nobody wastes
	   time debugging a case where it can!  */
      assert (TYPE_PRECISION (ffecom_f2c_ftnlen_type_node)
	      >= TYPE_PRECISION (TREE_TYPE (size)));
#endif
      size = convert (ffecom_f2c_ftnlen_type_node, size);
    }

  if (ffeinfo_rank (ffebld_info (expr)) == 0
      || TREE_CODE (TREE_TYPE (TREE_TYPE (variable))) != ARRAY_TYPE)
    num_elements = ffecom_integer_one_node;
  else
    {
      num_elements
	= size_binop (CEIL_DIV_EXPR,
		      TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (variable))),
		      convert (sizetype, size));
      num_elements = size_binop (CEIL_DIV_EXPR, num_elements,
				 size_int (TYPE_PRECISION (char_type_node)
					   / BITS_PER_UNIT));
      num_elements = convert (ffecom_f2c_ftnlen_type_node,
			      num_elements);
    }

  num_elements
    = ffecom_1 (ADDR_EXPR, ffecom_f2c_ptr_to_ftnlen_type_node,
		num_elements);

  variable = convert (string_type_node, variable);

  arglist = build_tree_list (NULL_TREE, type_id);
  TREE_CHAIN (arglist) = build_tree_list (NULL_TREE, num_elements);
  TREE_CHAIN (TREE_CHAIN (arglist)) = build_tree_list (NULL_TREE, variable);
  TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (arglist)))
    = build_tree_list (NULL_TREE, size);

  return ffecom_call_gfrt (FFECOM_gfrtDOLIO, arglist, NULL_TREE);
}

/* I/O driver for unformatted I/O item (do_uio)

   Returns a tree for a CALL_EXPR to the do_uio function, which handles
   an unformatted I/O list item, along with the appropriate arguments for
   the function.  It is up to the caller to set the TREE_SIDE_EFFECTS flag
   for the CALL_EXPR, expand (emit) the expression, emit any assignment
   of the result to an IOSTAT= variable, and emit any checking of the
   result for errors.  */

static tree
ffeste_io_douio_ (ffebld expr)
{
  tree num_elements;
  tree variable;
  tree size;
  tree arglist;
  ffeinfoBasictype bt;
  ffeinfoKindtype kt;
  bool is_complex;

  bt = ffeinfo_basictype (ffebld_info (expr));
  kt = ffeinfo_kindtype (ffebld_info (expr));

  if ((bt == FFEINFO_basictypeANY)
      || (kt == FFEINFO_kindtypeANY))
    return error_mark_node;

  if (bt == FFEINFO_basictypeCOMPLEX)
    {
      is_complex = TRUE;
      bt = FFEINFO_basictypeREAL;
    }
  else
    is_complex = FALSE;

  variable = ffecom_arg_ptr_to_expr (expr, &size);

  if ((variable == error_mark_node)
      || (size == error_mark_node))
    return error_mark_node;

  if (size == NULL_TREE)	/* Already filled in for CHARACTER type. */
    {				/* "(ftnlen) sizeof(type)" */
      size = size_binop (CEIL_DIV_EXPR,
			 TYPE_SIZE_UNIT (ffecom_tree_type[bt][kt]),
			 size_int (TYPE_PRECISION (char_type_node)
				   / BITS_PER_UNIT));
#if 0	/* Assume that while it is possible that char * is wider than
	   ftnlen, no object in Fortran space can get big enough for its
	   size to be wider than ftnlen.  I really hope nobody wastes
	   time debugging a case where it can!  */
      assert (TYPE_PRECISION (ffecom_f2c_ftnlen_type_node)
	      >= TYPE_PRECISION (TREE_TYPE (size)));
#endif
      size = convert (ffecom_f2c_ftnlen_type_node, size);
    }

  if (ffeinfo_rank (ffebld_info (expr)) == 0
      || TREE_CODE (TREE_TYPE (TREE_TYPE (variable))) != ARRAY_TYPE)
    num_elements
      = is_complex ? ffecom_f2c_ftnlen_two_node : ffecom_f2c_ftnlen_one_node;
  else
    {
      num_elements
	= size_binop (CEIL_DIV_EXPR,
		      TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (variable))),
		      convert (sizetype, size));
      num_elements = size_binop (CEIL_DIV_EXPR, num_elements,
				 size_int (TYPE_PRECISION (char_type_node)
					   / BITS_PER_UNIT));
      num_elements = convert (ffecom_f2c_ftnlen_type_node,
			      num_elements);
    }

  num_elements
    = ffecom_1 (ADDR_EXPR, ffecom_f2c_ptr_to_ftnlen_type_node,
		num_elements);

  variable = convert (string_type_node, variable);

  arglist = build_tree_list (NULL_TREE, num_elements);
  TREE_CHAIN (arglist) = build_tree_list (NULL_TREE, variable);
  TREE_CHAIN (TREE_CHAIN (arglist)) = build_tree_list (NULL_TREE, size);

  return ffecom_call_gfrt (FFECOM_gfrtDOUIO, arglist, NULL_TREE);
}

/* Make arglist with ptr to BACKSPACE/ENDFILE/REWIND control list.

   Returns a tree suitable as an argument list containing a pointer to
   a BACKSPACE/ENDFILE/REWIND control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_alist_struct;
static tree
ffeste_io_ialist_ (bool have_err,
		   ffestvUnit unit,
		   ffebld unit_expr,
		   int unit_dflt)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  bool constantp = TRUE;
  static tree errfield, unitfield;
  tree errinit, unitinit;
  tree unitexp;
  static int mynumber = 0;

  if (f2c_alist_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     ffecom_f2c_ftnint_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_alist_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);

  switch (unit)
    {
    case FFESTV_unitNONE:
    case FFESTV_unitASTERISK:
      unitinit = build_int_2 (unit_dflt, 0);
      unitexp = unitinit;
      break;

    case FFESTV_unitINTEXPR:
      unitexp = ffecom_const_expr (unit_expr);
      if (unitexp)
	unitinit = unitexp;
      else
	{
	  unitinit = ffecom_integer_zero_node;
	  constantp = FALSE;
	}
      break;

    default:
      assert ("bad unit spec" == NULL);
      unitinit = ffecom_integer_zero_node;
      unitexp = unitinit;
      break;
    }

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_alist_struct)), errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);

  inits = build_constructor (f2c_alist_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_alist_%d",
						  mynumber++),
		  f2c_alist_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  if (! unitexp)
    ffecom_prepare_expr (unit_expr);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  if (! unitexp)
    {
      unitexp = ffecom_expr (unit_expr);
      ffeste_f2c_compile_ (unitfield, unitexp);
    }

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Make arglist with ptr to external-I/O control list.

   Returns a tree suitable as an argument list containing a pointer to
   an external-I/O control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_cilist_struct;
static tree
ffeste_io_cilist_ (bool have_err,
		   ffestvUnit unit,
		   ffebld unit_expr,
		   int unit_dflt,
		   bool have_end,
		   ffestvFormat format,
		   ffestpFile *format_spec,
		   bool rec,
		   ffebld rec_expr)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  bool constantp = TRUE;
  static tree errfield, unitfield, endfield, formatfield, recfield;
  tree errinit, unitinit, endinit, formatinit, recinit;
  tree unitexp, formatexp, recexp;
  static int mynumber = 0;

  if (f2c_cilist_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     ffecom_f2c_ftnint_type_node);
      endfield = ffecom_decl_field (ref, unitfield, "end",
				    ffecom_f2c_flag_type_node);
      formatfield = ffecom_decl_field (ref, endfield, "format",
				       string_type_node);
      recfield = ffecom_decl_field (ref, formatfield, "rec",
				    ffecom_f2c_ftnint_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_cilist_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);

  switch (unit)
    {
    case FFESTV_unitNONE:
    case FFESTV_unitASTERISK:
      unitinit = build_int_2 (unit_dflt, 0);
      unitexp = unitinit;
      break;

    case FFESTV_unitINTEXPR:
      unitexp = ffecom_const_expr (unit_expr);
      if (unitexp)
	unitinit = unitexp;
      else
	{
	  unitinit = ffecom_integer_zero_node;
	  constantp = FALSE;
	}
      break;

    default:
      assert ("bad unit spec" == NULL);
      unitinit = ffecom_integer_zero_node;
      unitexp = unitinit;
      break;
    }

  switch (format)
    {
    case FFESTV_formatNONE:
      formatinit = null_pointer_node;
      formatexp = formatinit;
      break;

    case FFESTV_formatLABEL:
      formatexp = error_mark_node;
      formatinit = ffecom_lookup_label (format_spec->u.label);
      if ((formatinit == NULL_TREE)
	  || (TREE_CODE (formatinit) == ERROR_MARK))
	break;
      formatinit = ffecom_1 (ADDR_EXPR,
			     build_pointer_type (void_type_node),
			     formatinit);
      TREE_CONSTANT (formatinit) = 1;
      break;

    case FFESTV_formatCHAREXPR:
      formatexp = ffecom_arg_ptr_to_const_expr (format_spec->u.expr, NULL);
      if (formatexp)
	formatinit = formatexp;
      else
	{
	  formatinit = null_pointer_node;
	  constantp = FALSE;
	}
      break;

    case FFESTV_formatASTERISK:
      formatinit = null_pointer_node;
      formatexp = formatinit;
      break;

    case FFESTV_formatINTEXPR:
      formatinit = null_pointer_node;
      formatexp = ffecom_expr_assign (format_spec->u.expr);
      if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (formatexp)))
	  < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (null_pointer_node))))
	error ("ASSIGNed FORMAT specifier is too small");
      formatexp = convert (string_type_node, formatexp);
      break;

    case FFESTV_formatNAMELIST:
      formatinit = ffecom_expr (format_spec->u.expr);
      formatexp = formatinit;
      break;

    default:
      assert ("bad format spec" == NULL);
      formatinit = integer_zero_node;
      formatexp = formatinit;
      break;
    }

  ffeste_f2c_init_flag_ (have_end, endinit);

  if (rec)
    recexp = ffecom_const_expr (rec_expr);
  else
    recexp = ffecom_integer_zero_node;
  if (recexp)
    recinit = recexp;
  else
    {
      recinit = ffecom_integer_zero_node;
      constantp = FALSE;
    }

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_cilist_struct)), errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);
  ffeste_f2c_init_next_ (endinit);
  ffeste_f2c_init_next_ (formatinit);
  ffeste_f2c_init_next_ (recinit);

  inits = build_constructor (f2c_cilist_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_cilist_%d",
						  mynumber++),
		  f2c_cilist_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  if (! unitexp)
    ffecom_prepare_expr (unit_expr);

  if (! formatexp)
    ffecom_prepare_arg_ptr_to_expr (format_spec->u.expr);

  if (! recexp)
    ffecom_prepare_expr (rec_expr);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  if (! unitexp)
    {
      unitexp = ffecom_expr (unit_expr);
      ffeste_f2c_compile_ (unitfield, unitexp);
    }

  if (! formatexp)
    {
      formatexp = ffecom_arg_ptr_to_expr (format_spec->u.expr, NULL);
      ffeste_f2c_compile_ (formatfield, formatexp);
    }
  else if (format == FFESTV_formatINTEXPR)
    ffeste_f2c_compile_ (formatfield, formatexp);

  if (! recexp)
    {
      recexp = ffecom_expr (rec_expr);
      ffeste_f2c_compile_ (recfield, recexp);
    }

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Make arglist with ptr to CLOSE control list.

   Returns a tree suitable as an argument list containing a pointer to
   a CLOSE-statement control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_close_struct;
static tree
ffeste_io_cllist_ (bool have_err,
		   ffebld unit_expr,
		   ffestpFile *stat_spec)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  tree ignore;			/* Ignore length info for certain fields. */
  bool constantp = TRUE;
  static tree errfield, unitfield, statfield;
  tree errinit, unitinit, statinit;
  tree unitexp, statexp;
  static int mynumber = 0;

  if (f2c_close_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     ffecom_f2c_ftnint_type_node);
      statfield = ffecom_decl_field (ref, unitfield, "stat",
				     string_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_close_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);

  unitexp = ffecom_const_expr (unit_expr);
  if (unitexp)
    unitinit = unitexp;
  else
    {
      unitinit = ffecom_integer_zero_node;
      constantp = FALSE;
    }

  ffeste_f2c_init_charnolen_ (statexp, statinit, stat_spec);

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_close_struct)), errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);
  ffeste_f2c_init_next_ (statinit);

  inits = build_constructor (f2c_close_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_cllist_%d",
						  mynumber++),
		  f2c_close_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  if (! unitexp)
    ffecom_prepare_expr (unit_expr);

  if (! statexp)
    ffecom_prepare_arg_ptr_to_expr (stat_spec->u.expr);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  if (! unitexp)
    {
      unitexp = ffecom_expr (unit_expr);
      ffeste_f2c_compile_ (unitfield, unitexp);
    }

  ffeste_f2c_compile_charnolen_ (statfield, stat_spec, statexp);

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Make arglist with ptr to internal-I/O control list.

   Returns a tree suitable as an argument list containing a pointer to
   an internal-I/O control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_icilist_struct;
static tree
ffeste_io_icilist_ (bool have_err,
		    ffebld unit_expr,
		    bool have_end,
		    ffestvFormat format,
		    ffestpFile *format_spec)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  bool constantp = TRUE;
  static tree errfield, unitfield, endfield, formatfield, unitlenfield,
    unitnumfield;
  tree errinit, unitinit, endinit, formatinit, unitleninit, unitnuminit;
  tree unitexp, formatexp, unitlenexp, unitnumexp;
  static int mynumber = 0;

  if (f2c_icilist_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     string_type_node);
      endfield = ffecom_decl_field (ref, unitfield, "end",
				    ffecom_f2c_flag_type_node);
      formatfield = ffecom_decl_field (ref, endfield, "format",
				       string_type_node);
      unitlenfield = ffecom_decl_field (ref, formatfield, "unitlen",
					ffecom_f2c_ftnint_type_node);
      unitnumfield = ffecom_decl_field (ref, unitlenfield, "unitnum",
					ffecom_f2c_ftnint_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_icilist_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);

  unitexp = ffecom_arg_ptr_to_const_expr (unit_expr, &unitlenexp);
  if (unitexp)
    unitinit = unitexp;
  else
    {
      unitinit = null_pointer_node;
      constantp = FALSE;
    }
  if (unitlenexp)
    unitleninit = unitlenexp;
  else
    {
      unitleninit = ffecom_integer_zero_node;
      constantp = FALSE;
    }

  /* Now see if we can fully initialize the number of elements, or
     if we have to compute that at run time.  */
  if (ffeinfo_rank (ffebld_info (unit_expr)) == 0
      || (unitexp
	  && TREE_CODE (TREE_TYPE (TREE_TYPE (unitexp))) != ARRAY_TYPE))
    {
      /* Not an array, so just one element.  */
      unitnuminit = ffecom_integer_one_node;
      unitnumexp = unitnuminit;
    }
  else if (unitexp && unitlenexp)
    {
      /* An array, but all the info is constant, so compute now.  */
      unitnuminit
	= size_binop (CEIL_DIV_EXPR,
		      TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (unitexp))),
		      convert (sizetype, unitlenexp));
      unitnuminit = size_binop (CEIL_DIV_EXPR, unitnuminit,
				size_int (TYPE_PRECISION (char_type_node)
					  / BITS_PER_UNIT));
      unitnumexp = unitnuminit;
    }
  else
    {
      /* Put off computing until run time.  */
      unitnuminit = ffecom_integer_zero_node;
      unitnumexp = NULL_TREE;
      constantp = FALSE;
    }

  switch (format)
    {
    case FFESTV_formatNONE:
      formatinit = null_pointer_node;
      formatexp = formatinit;
      break;

    case FFESTV_formatLABEL:
      formatexp = error_mark_node;
      formatinit = ffecom_lookup_label (format_spec->u.label);
      if ((formatinit == NULL_TREE)
	  || (TREE_CODE (formatinit) == ERROR_MARK))
	break;
      formatinit = ffecom_1 (ADDR_EXPR,
			     build_pointer_type (void_type_node),
			     formatinit);
      TREE_CONSTANT (formatinit) = 1;
      break;

    case FFESTV_formatCHAREXPR:
      ffeste_f2c_init_format_ (formatexp, formatinit, format_spec);
      break;

    case FFESTV_formatASTERISK:
      formatinit = null_pointer_node;
      formatexp = formatinit;
      break;

    case FFESTV_formatINTEXPR:
      formatinit = null_pointer_node;
      formatexp = ffecom_expr_assign (format_spec->u.expr);
      if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (formatexp)))
	  < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (null_pointer_node))))
	error ("ASSIGNed FORMAT specifier is too small");
      formatexp = convert (string_type_node, formatexp);
      break;

    default:
      assert ("bad format spec" == NULL);
      formatinit = ffecom_integer_zero_node;
      formatexp = formatinit;
      break;
    }

  ffeste_f2c_init_flag_ (have_end, endinit);

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_icilist_struct)),
			   errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);
  ffeste_f2c_init_next_ (endinit);
  ffeste_f2c_init_next_ (formatinit);
  ffeste_f2c_init_next_ (unitleninit);
  ffeste_f2c_init_next_ (unitnuminit);

  inits = build_constructor (f2c_icilist_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_icilist_%d",
						  mynumber++),
		  f2c_icilist_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  if (! unitexp)
    ffecom_prepare_arg_ptr_to_expr (unit_expr);

  ffeste_f2c_prepare_format_ (format_spec, formatexp);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  if (! unitexp || ! unitlenexp)
    {
      int need_unitexp = (! unitexp);
      int need_unitlenexp = (! unitlenexp);

      unitexp = ffecom_arg_ptr_to_expr (unit_expr, &unitlenexp);
      if (need_unitexp)
	ffeste_f2c_compile_ (unitfield, unitexp);
      if (need_unitlenexp)
	ffeste_f2c_compile_ (unitlenfield, unitlenexp);
    }

  if (! unitnumexp
      && unitexp != error_mark_node
      && unitlenexp != error_mark_node)
    {
      unitnumexp
	= size_binop (CEIL_DIV_EXPR,
		      TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (unitexp))),
		      convert (sizetype, unitlenexp));
      unitnumexp = size_binop (CEIL_DIV_EXPR, unitnumexp,
			       size_int (TYPE_PRECISION (char_type_node)
					 / BITS_PER_UNIT));
      ffeste_f2c_compile_ (unitnumfield, unitnumexp);
    }

  if (format == FFESTV_formatINTEXPR)
    ffeste_f2c_compile_ (formatfield, formatexp);
  else
    ffeste_f2c_compile_format_ (formatfield, format_spec, formatexp);

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Make arglist with ptr to INQUIRE control list

   Returns a tree suitable as an argument list containing a pointer to
   an INQUIRE-statement control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_inquire_struct;
static tree
ffeste_io_inlist_ (bool have_err,
		   ffestpFile *unit_spec,
		   ffestpFile *file_spec,
		   ffestpFile *exist_spec,
		   ffestpFile *open_spec,
		   ffestpFile *number_spec,
		   ffestpFile *named_spec,
		   ffestpFile *name_spec,
		   ffestpFile *access_spec,
		   ffestpFile *sequential_spec,
		   ffestpFile *direct_spec,
		   ffestpFile *form_spec,
		   ffestpFile *formatted_spec,
		   ffestpFile *unformatted_spec,
		   ffestpFile *recl_spec,
		   ffestpFile *nextrec_spec,
		   ffestpFile *blank_spec)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  bool constantp = TRUE;
  static tree errfield, unitfield, filefield, filelenfield, existfield,
    openfield, numberfield, namedfield, namefield, namelenfield, accessfield,
    accesslenfield, sequentialfield, sequentiallenfield, directfield, directlenfield,
    formfield, formlenfield, formattedfield, formattedlenfield, unformattedfield,
    unformattedlenfield, reclfield, nextrecfield, blankfield, blanklenfield;
  tree errinit, unitinit, fileinit, fileleninit, existinit, openinit, numberinit,
    namedinit, nameinit, nameleninit, accessinit, accessleninit, sequentialinit,
    sequentialleninit, directinit, directleninit, forminit, formleninit,
    formattedinit, formattedleninit, unformattedinit, unformattedleninit,
    reclinit, nextrecinit, blankinit, blankleninit;
  tree
    unitexp, fileexp, filelenexp, existexp, openexp, numberexp, namedexp,
    nameexp, namelenexp, accessexp, accesslenexp, sequentialexp, sequentiallenexp,
    directexp, directlenexp, formexp, formlenexp, formattedexp, formattedlenexp,
    unformattedexp, unformattedlenexp, reclexp, nextrecexp, blankexp, blanklenexp;
  static int mynumber = 0;

  if (f2c_inquire_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     ffecom_f2c_ftnint_type_node);
      filefield = ffecom_decl_field (ref, unitfield, "file",
				     string_type_node);
      filelenfield = ffecom_decl_field (ref, filefield, "filelen",
					ffecom_f2c_ftnlen_type_node);
      existfield = ffecom_decl_field (ref, filelenfield, "exist",
				      ffecom_f2c_ptr_to_ftnint_type_node);
      openfield = ffecom_decl_field (ref, existfield, "open",
				     ffecom_f2c_ptr_to_ftnint_type_node);
      numberfield = ffecom_decl_field (ref, openfield, "number",
				       ffecom_f2c_ptr_to_ftnint_type_node);
      namedfield = ffecom_decl_field (ref, numberfield, "named",
				      ffecom_f2c_ptr_to_ftnint_type_node);
      namefield = ffecom_decl_field (ref, namedfield, "name",
				     string_type_node);
      namelenfield = ffecom_decl_field (ref, namefield, "namelen",
					ffecom_f2c_ftnlen_type_node);
      accessfield = ffecom_decl_field (ref, namelenfield, "access",
				       string_type_node);
      accesslenfield = ffecom_decl_field (ref, accessfield, "accesslen",
					  ffecom_f2c_ftnlen_type_node);
      sequentialfield = ffecom_decl_field (ref, accesslenfield, "sequential",
					   string_type_node);
      sequentiallenfield = ffecom_decl_field (ref, sequentialfield,
					      "sequentiallen",
					      ffecom_f2c_ftnlen_type_node);
      directfield = ffecom_decl_field (ref, sequentiallenfield, "direct",
				       string_type_node);
      directlenfield = ffecom_decl_field (ref, directfield, "directlen",
					  ffecom_f2c_ftnlen_type_node);
      formfield = ffecom_decl_field (ref, directlenfield, "form",
				     string_type_node);
      formlenfield = ffecom_decl_field (ref, formfield, "formlen",
					ffecom_f2c_ftnlen_type_node);
      formattedfield = ffecom_decl_field (ref, formlenfield, "formatted",
					  string_type_node);
      formattedlenfield = ffecom_decl_field (ref, formattedfield,
					     "formattedlen",
					     ffecom_f2c_ftnlen_type_node);
      unformattedfield = ffecom_decl_field (ref, formattedlenfield,
					    "unformatted",
					    string_type_node);
      unformattedlenfield = ffecom_decl_field (ref, unformattedfield,
					       "unformattedlen",
					       ffecom_f2c_ftnlen_type_node);
      reclfield = ffecom_decl_field (ref, unformattedlenfield, "recl",
				     ffecom_f2c_ptr_to_ftnint_type_node);
      nextrecfield = ffecom_decl_field (ref, reclfield, "nextrec",
					ffecom_f2c_ptr_to_ftnint_type_node);
      blankfield = ffecom_decl_field (ref, nextrecfield, "blank",
				      string_type_node);
      blanklenfield = ffecom_decl_field (ref, blankfield, "blanklen",
					 ffecom_f2c_ftnlen_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_inquire_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);
  ffeste_f2c_init_int_ (unitexp, unitinit, unit_spec);
  ffeste_f2c_init_char_ (fileexp, fileinit, filelenexp, fileleninit,
			 file_spec);
  ffeste_f2c_init_ptrtoint_ (existexp, existinit, exist_spec);
  ffeste_f2c_init_ptrtoint_ (openexp, openinit, open_spec);
  ffeste_f2c_init_ptrtoint_ (numberexp, numberinit, number_spec);
  ffeste_f2c_init_ptrtoint_ (namedexp, namedinit, named_spec);
  ffeste_f2c_init_char_ (nameexp, nameinit, namelenexp, nameleninit,
			 name_spec);
  ffeste_f2c_init_char_ (accessexp, accessinit, accesslenexp,
			 accessleninit, access_spec);
  ffeste_f2c_init_char_ (sequentialexp, sequentialinit, sequentiallenexp,
			 sequentialleninit, sequential_spec);
  ffeste_f2c_init_char_ (directexp, directinit, directlenexp,
			 directleninit, direct_spec);
  ffeste_f2c_init_char_ (formexp, forminit, formlenexp, formleninit,
			 form_spec);
  ffeste_f2c_init_char_ (formattedexp, formattedinit,
			 formattedlenexp, formattedleninit, formatted_spec);
  ffeste_f2c_init_char_ (unformattedexp, unformattedinit, unformattedlenexp,
			 unformattedleninit, unformatted_spec);
  ffeste_f2c_init_ptrtoint_ (reclexp, reclinit, recl_spec);
  ffeste_f2c_init_ptrtoint_ (nextrecexp, nextrecinit, nextrec_spec);
  ffeste_f2c_init_char_ (blankexp, blankinit, blanklenexp,
			 blankleninit, blank_spec);

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_inquire_struct)),
			   errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);
  ffeste_f2c_init_next_ (fileinit);
  ffeste_f2c_init_next_ (fileleninit);
  ffeste_f2c_init_next_ (existinit);
  ffeste_f2c_init_next_ (openinit);
  ffeste_f2c_init_next_ (numberinit);
  ffeste_f2c_init_next_ (namedinit);
  ffeste_f2c_init_next_ (nameinit);
  ffeste_f2c_init_next_ (nameleninit);
  ffeste_f2c_init_next_ (accessinit);
  ffeste_f2c_init_next_ (accessleninit);
  ffeste_f2c_init_next_ (sequentialinit);
  ffeste_f2c_init_next_ (sequentialleninit);
  ffeste_f2c_init_next_ (directinit);
  ffeste_f2c_init_next_ (directleninit);
  ffeste_f2c_init_next_ (forminit);
  ffeste_f2c_init_next_ (formleninit);
  ffeste_f2c_init_next_ (formattedinit);
  ffeste_f2c_init_next_ (formattedleninit);
  ffeste_f2c_init_next_ (unformattedinit);
  ffeste_f2c_init_next_ (unformattedleninit);
  ffeste_f2c_init_next_ (reclinit);
  ffeste_f2c_init_next_ (nextrecinit);
  ffeste_f2c_init_next_ (blankinit);
  ffeste_f2c_init_next_ (blankleninit);

  inits = build_constructor (f2c_inquire_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_inlist_%d",
						  mynumber++),
		  f2c_inquire_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  ffeste_f2c_prepare_int_ (unit_spec, unitexp);
  ffeste_f2c_prepare_char_ (file_spec, fileexp);
  ffeste_f2c_prepare_ptrtoint_ (exist_spec, existexp);
  ffeste_f2c_prepare_ptrtoint_ (open_spec, openexp);
  ffeste_f2c_prepare_ptrtoint_ (number_spec, numberexp);
  ffeste_f2c_prepare_ptrtoint_ (named_spec, namedexp);
  ffeste_f2c_prepare_char_ (name_spec, nameexp);
  ffeste_f2c_prepare_char_ (access_spec, accessexp);
  ffeste_f2c_prepare_char_ (sequential_spec, sequentialexp);
  ffeste_f2c_prepare_char_ (direct_spec, directexp);
  ffeste_f2c_prepare_char_ (form_spec, formexp);
  ffeste_f2c_prepare_char_ (formatted_spec, formattedexp);
  ffeste_f2c_prepare_char_ (unformatted_spec, unformattedexp);
  ffeste_f2c_prepare_ptrtoint_ (recl_spec, reclexp);
  ffeste_f2c_prepare_ptrtoint_ (nextrec_spec, nextrecexp);
  ffeste_f2c_prepare_char_ (blank_spec, blankexp);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  ffeste_f2c_compile_int_ (unitfield, unit_spec, unitexp);
  ffeste_f2c_compile_char_ (filefield, filelenfield, file_spec,
			    fileexp, filelenexp);
  ffeste_f2c_compile_ptrtoint_ (existfield, exist_spec, existexp);
  ffeste_f2c_compile_ptrtoint_ (openfield, open_spec, openexp);
  ffeste_f2c_compile_ptrtoint_ (numberfield, number_spec, numberexp);
  ffeste_f2c_compile_ptrtoint_ (namedfield, named_spec, namedexp);
  ffeste_f2c_compile_char_ (namefield, namelenfield, name_spec, nameexp,
			    namelenexp);
  ffeste_f2c_compile_char_ (accessfield, accesslenfield, access_spec,
			    accessexp, accesslenexp);
  ffeste_f2c_compile_char_ (sequentialfield, sequentiallenfield,
			    sequential_spec, sequentialexp,
			    sequentiallenexp);
  ffeste_f2c_compile_char_ (directfield, directlenfield, direct_spec,
			    directexp, directlenexp);
  ffeste_f2c_compile_char_ (formfield, formlenfield, form_spec, formexp,
			    formlenexp);
  ffeste_f2c_compile_char_ (formattedfield, formattedlenfield, formatted_spec,
			    formattedexp, formattedlenexp);
  ffeste_f2c_compile_char_ (unformattedfield, unformattedlenfield,
			    unformatted_spec, unformattedexp,
			    unformattedlenexp);
  ffeste_f2c_compile_ptrtoint_ (reclfield, recl_spec, reclexp);
  ffeste_f2c_compile_ptrtoint_ (nextrecfield, nextrec_spec, nextrecexp);
  ffeste_f2c_compile_char_ (blankfield, blanklenfield, blank_spec, blankexp,
			    blanklenexp);

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Make arglist with ptr to OPEN control list

   Returns a tree suitable as an argument list containing a pointer to
   an OPEN-statement control list.  First, generates that control
   list, if necessary, along with any static and run-time initializations
   that are needed as specified by the arguments to this function.

   Must ensure that all expressions are prepared before being evaluated,
   for any whose evaluation might result in the generation of temporaries.

   Note that this means this function causes a transition, within the
   current block being code-generated via the back end, from the
   declaration of variables (temporaries) to the expanding of expressions,
   statements, etc.  */

static GTY(()) tree f2c_open_struct;
static tree
ffeste_io_olist_ (bool have_err,
		  ffebld unit_expr,
		  ffestpFile *file_spec,
		  ffestpFile *stat_spec,
		  ffestpFile *access_spec,
		  ffestpFile *form_spec,
		  ffestpFile *recl_spec,
		  ffestpFile *blank_spec)
{
  tree t;
  tree ttype;
  tree field;
  tree inits, initn;
  tree ignore;			/* Ignore length info for certain fields. */
  bool constantp = TRUE;
  static tree errfield, unitfield, filefield, filelenfield, statfield,
    accessfield, formfield, reclfield, blankfield;
  tree errinit, unitinit, fileinit, fileleninit, statinit, accessinit,
    forminit, reclinit, blankinit;
  tree
    unitexp, fileexp, filelenexp, statexp, accessexp, formexp, reclexp,
    blankexp;
  static int mynumber = 0;

  if (f2c_open_struct == NULL_TREE)
    {
      tree ref;

      ref = make_node (RECORD_TYPE);

      errfield = ffecom_decl_field (ref, NULL_TREE, "err",
				    ffecom_f2c_flag_type_node);
      unitfield = ffecom_decl_field (ref, errfield, "unit",
				     ffecom_f2c_ftnint_type_node);
      filefield = ffecom_decl_field (ref, unitfield, "file",
				     string_type_node);
      filelenfield = ffecom_decl_field (ref, filefield, "filelen",
					ffecom_f2c_ftnlen_type_node);
      statfield = ffecom_decl_field (ref, filelenfield, "stat",
				     string_type_node);
      accessfield = ffecom_decl_field (ref, statfield, "access",
				       string_type_node);
      formfield = ffecom_decl_field (ref, accessfield, "form",
				     string_type_node);
      reclfield = ffecom_decl_field (ref, formfield, "recl",
				     ffecom_f2c_ftnint_type_node);
      blankfield = ffecom_decl_field (ref, reclfield, "blank",
				      string_type_node);

      TYPE_FIELDS (ref) = errfield;
      layout_type (ref);

      f2c_open_struct = ref;
    }

  /* Try to do as much compile-time initialization of the structure
     as possible, to save run time.  */

  ffeste_f2c_init_flag_ (have_err, errinit);

  unitexp = ffecom_const_expr (unit_expr);
  if (unitexp)
    unitinit = unitexp;
  else
    {
      unitinit = ffecom_integer_zero_node;
      constantp = FALSE;
    }

  ffeste_f2c_init_char_ (fileexp, fileinit, filelenexp, fileleninit,
			 file_spec);
  ffeste_f2c_init_charnolen_ (statexp, statinit, stat_spec);
  ffeste_f2c_init_charnolen_ (accessexp, accessinit, access_spec);
  ffeste_f2c_init_charnolen_ (formexp, forminit, form_spec);
  ffeste_f2c_init_int_ (reclexp, reclinit, recl_spec);
  ffeste_f2c_init_charnolen_ (blankexp, blankinit, blank_spec);

  inits = build_tree_list ((field = TYPE_FIELDS (f2c_open_struct)), errinit);
  initn = inits;
  ffeste_f2c_init_next_ (unitinit);
  ffeste_f2c_init_next_ (fileinit);
  ffeste_f2c_init_next_ (fileleninit);
  ffeste_f2c_init_next_ (statinit);
  ffeste_f2c_init_next_ (accessinit);
  ffeste_f2c_init_next_ (forminit);
  ffeste_f2c_init_next_ (reclinit);
  ffeste_f2c_init_next_ (blankinit);

  inits = build_constructor (f2c_open_struct, inits);
  TREE_CONSTANT (inits) = constantp ? 1 : 0;
  TREE_STATIC (inits) = 1;

  t = build_decl (VAR_DECL,
		  ffecom_get_invented_identifier ("__g77_olist_%d",
						  mynumber++),
		  f2c_open_struct);
  TREE_STATIC (t) = 1;
  t = ffecom_start_decl (t, 1);
  ffecom_finish_decl (t, inits, 0);

  /* Prepare run-time expressions.  */

  if (! unitexp)
    ffecom_prepare_expr (unit_expr);

  ffeste_f2c_prepare_char_ (file_spec, fileexp);
  ffeste_f2c_prepare_charnolen_ (stat_spec, statexp);
  ffeste_f2c_prepare_charnolen_ (access_spec, accessexp);
  ffeste_f2c_prepare_charnolen_ (form_spec, formexp);
  ffeste_f2c_prepare_int_ (recl_spec, reclexp);
  ffeste_f2c_prepare_charnolen_ (blank_spec, blankexp);

  ffecom_prepare_end ();

  /* Now evaluate run-time expressions as needed.  */

  if (! unitexp)
    {
      unitexp = ffecom_expr (unit_expr);
      ffeste_f2c_compile_ (unitfield, unitexp);
    }

  ffeste_f2c_compile_char_ (filefield, filelenfield, file_spec, fileexp,
			    filelenexp);
  ffeste_f2c_compile_charnolen_ (statfield, stat_spec, statexp);
  ffeste_f2c_compile_charnolen_ (accessfield, access_spec, accessexp);
  ffeste_f2c_compile_charnolen_ (formfield, form_spec, formexp);
  ffeste_f2c_compile_int_ (reclfield, recl_spec, reclexp);
  ffeste_f2c_compile_charnolen_ (blankfield, blank_spec, blankexp);

  ttype = build_pointer_type (TREE_TYPE (t));
  t = ffecom_1 (ADDR_EXPR, ttype, t);

  t = build_tree_list (NULL_TREE, t);

  return t;
}

/* Generate code for BACKSPACE/ENDFILE/REWIND.  */

static void
ffeste_subr_beru_ (ffestpBeruStmt *info, ffecomGfrt rt)
{
  tree alist;
  bool iostat;
  bool errl;

  ffeste_emit_line_note_ ();

#define specified(something) (info->beru_spec[something].kw_or_val_present)

  iostat = specified (FFESTP_beruixIOSTAT);
  errl = specified (FFESTP_beruixERR);

#undef specified

  /* ~~For now, we assume the unit number is specified and is not ASTERISK,
     because the FFE doesn't support BACKSPACE(*) and rejects a BACKSPACE
     without any unit specifier.  f2c, however, supports the former
     construct.	 When it is time to add this feature to the FFE, which
     probably is fairly easy, ffestc_R919 and company will want to pass an
     ffestvUnit indicator of FFESTV_unitINTEXPR or _unitASTERISK to
     ffeste_R919 and company, and they will want to pass that same value to
     this function, and that argument will replace the constant _unitINTEXPR_
     in the call below.	 Right now, the default unit number, 6, is ignored.  */

  ffeste_start_stmt_ ();

  if (errl)
    {
      /* Have ERR= specification.   */

      ffeste_io_err_
	= ffeste_io_abort_
	= ffecom_lookup_label
	(info->beru_spec[FFESTP_beruixERR].u.label);
      ffeste_io_abort_is_temp_ = FALSE;
    }
  else
    {
      /* No ERR= specification.  */

      ffeste_io_err_ = NULL_TREE;

      if ((ffeste_io_abort_is_temp_ = iostat))
	ffeste_io_abort_ = ffecom_temp_label ();
      else
	ffeste_io_abort_ = NULL_TREE;
    }

  if (iostat)
    {
      /* Have IOSTAT= specification.  */

      ffeste_io_iostat_is_temp_ = FALSE;
      ffeste_io_iostat_ = ffecom_expr
	(info->beru_spec[FFESTP_beruixIOSTAT].u.expr);
    }
  else if (ffeste_io_abort_ != NULL_TREE)
    {
      /* Have no IOSTAT= but have ERR=.  */

      ffeste_io_iostat_is_temp_ = TRUE;
      ffeste_io_iostat_
	= ffecom_make_tempvar ("beru", ffecom_integer_type_node,
			       FFETARGET_charactersizeNONE, -1);
    }
  else
    {
      /* No IOSTAT= or ERR= specification.  */

      ffeste_io_iostat_is_temp_ = FALSE;
      ffeste_io_iostat_ = NULL_TREE;
    }

  /* Now prescan, then convert, all the arguments.  */

  alist = ffeste_io_ialist_ (errl || iostat, FFESTV_unitINTEXPR,
			     info->beru_spec[FFESTP_beruixUNIT].u.expr, 6);

  /* Don't generate "if (iostat != 0) goto label;" if label is temp abort
     label, since we're gonna fall through to there anyway. */

  ffeste_io_call_ (ffecom_call_gfrt (rt, alist, NULL_TREE),
		   ! ffeste_io_abort_is_temp_);

  /* If we've got a temp label, generate its code here. */

  if (ffeste_io_abort_is_temp_)
    {
      DECL_INITIAL (ffeste_io_abort_) = error_mark_node;
      emit_nop ();
      expand_label (ffeste_io_abort_);

      assert (ffeste_io_err_ == NULL_TREE);
    }

  ffeste_end_stmt_ ();
}

/* END DO statement

   Also invoked by _labeldef_branch_finish_ (or, in cases
   of errors, other _labeldef_ functions) when the label definition is
   for a DO-target (LOOPEND) label, once per matching/outstanding DO
   block on the stack.  */

void
ffeste_do (ffestw block)
{
  ffeste_emit_line_note_ ();

  if (ffestw_do_tvar (block) == 0)
    {
      expand_end_loop ();		/* DO WHILE and just DO. */

      ffeste_end_block_ (block);
    }
  else
    ffeste_end_iterdo_ (block,
			ffestw_do_tvar (block),
			ffestw_do_incr_saved (block),
			ffestw_do_count_var (block));
}

/* End of statement following logical IF.

   Applies to *only* logical IF, not to IF-THEN.  */

void
ffeste_end_R807 (void)
{
  ffeste_emit_line_note_ ();

  expand_end_cond ();

  ffeste_end_block_ (NULL);
}

/* Generate "code" for branch label definition.  */

void
ffeste_labeldef_branch (ffelab label)
{
  tree glabel;

  glabel = ffecom_lookup_label (label);
  assert (glabel != NULL_TREE);
  if (TREE_CODE (glabel) == ERROR_MARK)
    return;

  assert (DECL_INITIAL (glabel) == NULL_TREE);

  DECL_INITIAL (glabel) = error_mark_node;
  DECL_SOURCE_FILE (glabel) = ffelab_definition_filename (label);
  DECL_SOURCE_LINE (glabel) = ffelab_definition_filelinenum (label);

  emit_nop ();

  expand_label (glabel);
}

/* Generate "code" for FORMAT label definition.  */

void
ffeste_labeldef_format (ffelab label)
{
  ffeste_label_formatdef_ = label;
}

/* Assignment statement (outside of WHERE).  */

void
ffeste_R737A (ffebld dest, ffebld source)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_stmt_ ();

  ffecom_expand_let_stmt (dest, source);

  ffeste_end_stmt_ ();
}

/* Block IF (IF-THEN) statement.  */

void
ffeste_R803 (ffestw block, ffebld expr)
{
  tree temp;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_block_ (block);

  temp = ffecom_make_tempvar ("ifthen", integer_type_node,
			      FFETARGET_charactersizeNONE, -1);

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (expr);

  if (ffecom_prepare_end ())
    {
      tree result;

      result = ffecom_modify (void_type_node,
			      temp,
			      ffecom_truth_value (ffecom_expr (expr)));

      expand_expr_stmt (result);

      ffeste_end_stmt_ ();
    }
  else
    {
      ffeste_end_stmt_ ();

      temp = ffecom_truth_value (ffecom_expr (expr));
    }

  expand_start_cond (temp, 0);

  /* No fake `else' constructs introduced (yet).  */
  ffestw_set_ifthen_fake_else (block, 0);
}

/* ELSE IF statement.  */

void
ffeste_R804 (ffestw block, ffebld expr)
{
  tree temp;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  /* Since ELSEIF(expr) might require preparations for expr,
     implement as ELSE; prepare-expr; IF (expr) THEN ...; ENDIF.  */

  expand_start_else ();

  ffeste_start_block_ (block);

  temp = ffecom_make_tempvar ("elseif", integer_type_node,
			      FFETARGET_charactersizeNONE, -1);

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (expr);

  if (ffecom_prepare_end ())
    {
      tree result;

      result = ffecom_modify (void_type_node,
			      temp,
			      ffecom_truth_value (ffecom_expr (expr)));

      expand_expr_stmt (result);

      ffeste_end_stmt_ ();
    }
  else
    {
      /* In this case, we could probably have used expand_start_elseif
	 instead, saving the need for a fake `else' construct.  But,
	 until it's clear that'd improve performance, it's easier this
	 way, since we have to expand_start_else before we get to this
	 test, given the current design.  */

      ffeste_end_stmt_ ();

      temp = ffecom_truth_value (ffecom_expr (expr));
    }

  expand_start_cond (temp, 0);

  /* Increment number of fake `else' constructs introduced.  */
  ffestw_set_ifthen_fake_else (block,
			       ffestw_ifthen_fake_else (block) + 1);
}

/* ELSE statement.  */

void
ffeste_R805 (ffestw block UNUSED)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  expand_start_else ();
}

/* END IF statement.  */

void
ffeste_R806 (ffestw block)
{
  int i = ffestw_ifthen_fake_else (block) + 1;

  ffeste_emit_line_note_ ();

  for (; i; --i)
    {
      expand_end_cond ();

      ffeste_end_block_ (block);
    }
}

/* Logical IF statement.  */

void
ffeste_R807 (ffebld expr)
{
  tree temp;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_block_ (NULL);

  temp = ffecom_make_tempvar ("if", integer_type_node,
			      FFETARGET_charactersizeNONE, -1);

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (expr);

  if (ffecom_prepare_end ())
    {
      tree result;

      result = ffecom_modify (void_type_node,
			      temp,
			      ffecom_truth_value (ffecom_expr (expr)));

      expand_expr_stmt (result);

      ffeste_end_stmt_ ();
    }
  else
    {
      ffeste_end_stmt_ ();

      temp = ffecom_truth_value (ffecom_expr (expr));
    }

  expand_start_cond (temp, 0);
}

/* SELECT CASE statement.  */

void
ffeste_R809 (ffestw block, ffebld expr)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_block_ (block);

  if ((expr == NULL)
      || (ffeinfo_basictype (ffebld_info (expr))
	  == FFEINFO_basictypeANY))
    ffestw_set_select_texpr (block, error_mark_node);
  else if (ffeinfo_basictype (ffebld_info (expr))
	   == FFEINFO_basictypeCHARACTER)
    {
      /* ~~~Someday handle CHARACTER*1, CHARACTER*N */

      /* xgettext:no-c-format */
      ffebad_start_msg ("SELECT CASE on CHARACTER type (at %0) not supported -- sorry",
			FFEBAD_severityFATAL);
      ffebad_here (0, ffestw_line (block), ffestw_col (block));
      ffebad_finish ();
      ffestw_set_select_texpr (block, error_mark_node);
    }
  else
    {
      tree result;
      tree texpr;

      result = ffecom_make_tempvar ("select", ffecom_type_expr (expr),
				    ffeinfo_size (ffebld_info (expr)),
				    -1);

      ffeste_start_stmt_ ();

      ffecom_prepare_expr (expr);

      ffecom_prepare_end ();

      texpr = ffecom_expr (expr);

      assert (TYPE_MAIN_VARIANT (TREE_TYPE (texpr))
	      == TYPE_MAIN_VARIANT (TREE_TYPE (result)));

      texpr = ffecom_modify (void_type_node,
			     result,
			     texpr);
      expand_expr_stmt (texpr);

      ffeste_end_stmt_ ();

      expand_start_case (1, result, TREE_TYPE (result),
			 "SELECT CASE statement");
      ffestw_set_select_texpr (block, texpr);
      ffestw_set_select_break (block, FALSE);
    }
}

/* CASE statement.

   If casenum is 0, it's CASE DEFAULT.	Else it's the case ranges at
   the start of the first_stmt list in the select object at the top of
   the stack that match casenum.  */

void
ffeste_R810 (ffestw block, unsigned long casenum)
{
  ffestwSelect s = ffestw_select (block);
  ffestwCase c;
  tree texprlow;
  tree texprhigh;
  tree tlabel;
  int pushok;
  tree duplicate;

  ffeste_check_simple_ ();

  if (s->first_stmt == (ffestwCase) &s->first_rel)
    c = NULL;
  else
    c = s->first_stmt;

  ffeste_emit_line_note_ ();

  if (ffestw_select_texpr (block) == error_mark_node)
    return;

  /* ~~~Someday handle CHARACTER*1, CHARACTER*N */

  tlabel = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);

  if (ffestw_select_break (block))
    expand_exit_something ();
  else
    ffestw_set_select_break (block, TRUE);

  if ((c == NULL) || (casenum != c->casenum))
    {
      if (casenum == 0)	/* Intentional CASE DEFAULT. */
	{
	  pushok = pushcase (NULL_TREE, 0, tlabel, &duplicate);
	  assert (pushok == 0);
	}
    }
  else
    do
      {
	texprlow = (c->low == NULL) ? NULL_TREE
	  : ffecom_constantunion_with_type (&ffebld_constant_union (c->low),
				  ffecom_tree_type[s->type][s->kindtype],c->low->consttype);
	if (c->low != c->high)
	  {
	    texprhigh = (c->high == NULL) ? NULL_TREE
	      : ffecom_constantunion_with_type (&ffebld_constant_union (c->high),
				      ffecom_tree_type[s->type][s->kindtype],c->high->consttype);
	    pushok = pushcase_range (texprlow, texprhigh, convert,
				     tlabel, &duplicate);
	  }
	else
	  pushok = pushcase (texprlow, convert, tlabel, &duplicate);
	if (pushok == 2)
	  {
	    ffebad_start_msg ("SELECT (at %0) has duplicate cases -- check integer overflow of CASE(s)",
	      FFEBAD_severityFATAL);
	    ffebad_here (0, ffestw_line (block), ffestw_col (block));
	    ffebad_finish ();
	    ffestw_set_select_texpr (block, error_mark_node);
	  }
	c = c->next_stmt;
	/* Unlink prev.  */
	c->previous_stmt->previous_stmt->next_stmt = c;
	c->previous_stmt = c->previous_stmt->previous_stmt;
      }
    while ((c != (ffestwCase) &s->first_rel) && (casenum == c->casenum));
}

/* END SELECT statement.  */

void
ffeste_R811 (ffestw block)
{
  ffeste_emit_line_note_ ();

  /* ~~~Someday handle CHARACTER*1, CHARACTER*N */

  if (TREE_CODE (ffestw_select_texpr (block)) != ERROR_MARK)
    expand_end_case (ffestw_select_texpr (block));

  ffeste_end_block_ (block);
}

/* Iterative DO statement.  */

void
ffeste_R819A (ffestw block, ffelab label UNUSED, ffebld var,
	      ffebld start, ffelexToken start_token,
	      ffebld end, ffelexToken end_token,
	      ffebld incr, ffelexToken incr_token)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_begin_iterdo_ (block, NULL, NULL, NULL,
			var,
			start, start_token,
			end, end_token,
			incr, incr_token,
			"Iterative DO loop");
}

/* DO WHILE statement.  */

void
ffeste_R819B (ffestw block, ffelab label UNUSED, ffebld expr)
{
  tree result;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_block_ (block);

  if (expr)
    {
      struct nesting *loop;
      tree mod;

      result = ffecom_make_tempvar ("dowhile", integer_type_node,
				    FFETARGET_charactersizeNONE, -1);
      loop = expand_start_loop (1);

      ffeste_start_stmt_ ();

      ffecom_prepare_expr (expr);

      ffecom_prepare_end ();

      mod = ffecom_modify (void_type_node,
			   result,
			   ffecom_truth_value (ffecom_expr (expr)));
      expand_expr_stmt (mod);

      ffeste_end_stmt_ ();

      ffestw_set_do_hook (block, loop);
      expand_exit_loop_top_cond (0, result);
    }
  else
    ffestw_set_do_hook (block, expand_start_loop (1));

  ffestw_set_do_tvar (block, NULL_TREE);
}

/* END DO statement.

   This is the MIL-STD 1753 END DO. It's syntactic sugar, similar to
   CONTINUE (except that it has to have a label that is the target of
   one or more iterative DO statement), not the Fortran-90 structured
   END DO, which is handled elsewhere, as is the actual mechanism of
   ending an iterative DO statement, even one that ends at a label.  */

void
ffeste_R825 (void)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  emit_nop ();
}

/* CYCLE statement.  */

void
ffeste_R834 (ffestw block)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  expand_continue_loop (ffestw_do_hook (block));
}

/* EXIT statement.  */

void
ffeste_R835 (ffestw block)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  expand_exit_loop (ffestw_do_hook (block));
}

/* GOTO statement.  */

void
ffeste_R836 (ffelab label)
{
  tree glabel;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  glabel = ffecom_lookup_label (label);
  if ((glabel != NULL_TREE)
      && (TREE_CODE (glabel) != ERROR_MARK))
    {
      expand_goto (glabel);
      TREE_USED (glabel) = 1;
    }
}

/* Computed GOTO statement.  */

void
ffeste_R837 (ffelab *labels, int count, ffebld expr)
{
  int i;
  tree texpr;
  tree value;
  tree tlabel;
  int pushok;
  tree duplicate;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (expr);

  ffecom_prepare_end ();

  texpr = ffecom_expr (expr);

  expand_start_case (0, texpr, TREE_TYPE (texpr), "computed GOTO statement");

  for (i = 0; i < count; ++i)
    {
      value = build_int_2 (i + 1, 0);
      tlabel = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);

      pushok = pushcase (value, convert, tlabel, &duplicate);
      assert (pushok == 0);

      tlabel = ffecom_lookup_label (labels[i]);
      if ((tlabel == NULL_TREE)
	  || (TREE_CODE (tlabel) == ERROR_MARK))
	continue;

      expand_goto (tlabel);
      TREE_USED (tlabel) = 1;
    }
  expand_end_case (texpr);

  ffeste_end_stmt_ ();
}

/* ASSIGN statement.  */

void
ffeste_R838 (ffelab label, ffebld target)
{
  tree expr_tree;
  tree label_tree;
  tree target_tree;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

    /* No need to call ffeste_start_stmt_(), as the sorts of expressions
       seen here should never require use of temporaries.  */

  label_tree = ffecom_lookup_label (label);
  if ((label_tree != NULL_TREE)
      && (TREE_CODE (label_tree) != ERROR_MARK))
    {
      label_tree = ffecom_1 (ADDR_EXPR,
			     build_pointer_type (void_type_node),
			     label_tree);
      TREE_CONSTANT (label_tree) = 1;

      target_tree = ffecom_expr_assign_w (target);
      if (TREE_CODE (target_tree) != ERROR_MARK)
      {
        if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (target_tree)))
            < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (label_tree))))
	  error ("ASSIGN to variable that is too small");

        label_tree = convert (TREE_TYPE (target_tree), label_tree);

        expr_tree = ffecom_modify (void_type_node,
				 target_tree,
				 label_tree);
        expand_expr_stmt (expr_tree);
      }
    }
}

/* Assigned GOTO statement.  */

void
ffeste_R839 (ffebld target)
{
  tree t;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  /* No need to call ffeste_start_stmt_(), as the sorts of expressions
     seen here should never require use of temporaries.  */

  t = ffecom_expr_assign (target);

  if (TREE_CODE (t) != ERROR_MARK)
  {
       if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (t)))
         < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (null_pointer_node))))
       error ("ASSIGNed GOTO target variable is too small");

       expand_computed_goto (convert (TREE_TYPE (null_pointer_node), t));
  }
}

/* Arithmetic IF statement.  */

void
ffeste_R840 (ffebld expr, ffelab neg, ffelab zero, ffelab pos)
{
  tree gneg = ffecom_lookup_label (neg);
  tree gzero = ffecom_lookup_label (zero);
  tree gpos = ffecom_lookup_label (pos);
  tree texpr;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  if ((gneg == NULL_TREE) || (gzero == NULL_TREE) || (gpos == NULL_TREE))
    return;
  if ((TREE_CODE (gneg) == ERROR_MARK)
      || (TREE_CODE (gzero) == ERROR_MARK)
      || (TREE_CODE (gpos) == ERROR_MARK))
    return;

  ffeste_start_stmt_ ();

  ffecom_prepare_expr (expr);

  ffecom_prepare_end ();

  if (neg == zero)
    {
      if (neg == pos)
	expand_goto (gzero);
      else
	{
	  /* IF (expr.LE.0) THEN GOTO neg/zero ELSE GOTO pos.  */
	  texpr = ffecom_expr (expr);
	  texpr = ffecom_2 (LE_EXPR, integer_type_node,
			    texpr,
			    convert (TREE_TYPE (texpr),
				     integer_zero_node));
	  expand_start_cond (ffecom_truth_value (texpr), 0);
	  expand_goto (gzero);
	  expand_start_else ();
	  expand_goto (gpos);
	  expand_end_cond ();
	}
    }
  else if (neg == pos)
    {
      /* IF (expr.NE.0) THEN GOTO neg/pos ELSE GOTO zero.  */
      texpr = ffecom_expr (expr);
      texpr = ffecom_2 (NE_EXPR, integer_type_node,
			texpr,
			convert (TREE_TYPE (texpr),
				 integer_zero_node));
      expand_start_cond (ffecom_truth_value (texpr), 0);
      expand_goto (gneg);
      expand_start_else ();
      expand_goto (gzero);
      expand_end_cond ();
    }
  else if (zero == pos)
    {
      /* IF (expr.GE.0) THEN GOTO zero/pos ELSE GOTO neg.  */
      texpr = ffecom_expr (expr);
      texpr = ffecom_2 (GE_EXPR, integer_type_node,
			texpr,
			convert (TREE_TYPE (texpr),
				 integer_zero_node));
      expand_start_cond (ffecom_truth_value (texpr), 0);
      expand_goto (gzero);
      expand_start_else ();
      expand_goto (gneg);
      expand_end_cond ();
    }
  else
    {
      /* Use a SAVE_EXPR in combo with:
	 IF (expr.LT.0) THEN GOTO neg
	 ELSEIF (expr.GT.0) THEN GOTO pos
	 ELSE GOTO zero.  */
      tree expr_saved = ffecom_save_tree (ffecom_expr (expr));

      texpr = ffecom_2 (LT_EXPR, integer_type_node,
			expr_saved,
			convert (TREE_TYPE (expr_saved),
				 integer_zero_node));
      expand_start_cond (ffecom_truth_value (texpr), 0);
      expand_goto (gneg);
      texpr = ffecom_2 (GT_EXPR, integer_type_node,
			expr_saved,
			convert (TREE_TYPE (expr_saved),
				 integer_zero_node));
      expand_start_elseif (ffecom_truth_value (texpr));
      expand_goto (gpos);
      expand_start_else ();
      expand_goto (gzero);
      expand_end_cond ();
    }

  ffeste_end_stmt_ ();
}

/* CONTINUE statement.  */

void
ffeste_R841 (void)
{
  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  emit_nop ();
}

/* STOP statement.  */

void
ffeste_R842 (ffebld expr)
{
  tree callit;
  ffelexToken msg;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  if ((expr == NULL)
      || (ffeinfo_basictype (ffebld_info (expr))
	  == FFEINFO_basictypeANY))
    {
      msg = ffelex_token_new_character ("",
					ffelex_token_where_line (ffesta_tokens[0]),
					ffelex_token_where_column (ffesta_tokens[0]));
      expr = ffebld_new_conter (ffebld_constant_new_characterdefault
				(msg));
      ffelex_token_kill (msg);
      ffebld_set_info (expr, ffeinfo_new (FFEINFO_basictypeCHARACTER,
					  FFEINFO_kindtypeCHARACTERDEFAULT,
					  0, FFEINFO_kindENTITY,
					  FFEINFO_whereCONSTANT, 0));
    }
  else if (ffeinfo_basictype (ffebld_info (expr))
	   == FFEINFO_basictypeINTEGER)
    {
      char num[50];

      assert (ffebld_op (expr) == FFEBLD_opCONTER);
      assert (ffeinfo_kindtype (ffebld_info (expr))
	      == FFEINFO_kindtypeINTEGERDEFAULT);
      sprintf (num, "%" ffetargetIntegerDefault_f "d",
	       ffebld_constant_integer1 (ffebld_conter (expr)));
      msg = ffelex_token_new_character (num,
					ffelex_token_where_line (ffesta_tokens[0]),
					ffelex_token_where_column (ffesta_tokens[0]));
      expr = ffebld_new_conter (ffebld_constant_new_characterdefault (msg));
      ffelex_token_kill (msg);
      ffebld_set_info (expr, ffeinfo_new (FFEINFO_basictypeCHARACTER,
					  FFEINFO_kindtypeCHARACTERDEFAULT,
					  0, FFEINFO_kindENTITY,
					  FFEINFO_whereCONSTANT, 0));
    }
  else
    {
      assert (ffeinfo_basictype (ffebld_info (expr))
	      == FFEINFO_basictypeCHARACTER);
      assert (ffebld_op (expr) == FFEBLD_opCONTER);
      assert (ffeinfo_kindtype (ffebld_info (expr))
	      == FFEINFO_kindtypeCHARACTERDEFAULT);
    }

  /* No need to call ffeste_start_stmt_(), as the sorts of expressions
     seen here should never require use of temporaries.  */

  callit = ffecom_call_gfrt (FFECOM_gfrtSTOP,
			     ffecom_list_ptr_to_expr (ffebld_new_item (expr, NULL)),
			     NULL_TREE);
  TREE_SIDE_EFFECTS (callit) = 1;

  expand_expr_stmt (callit);
}

/* PAUSE statement.  */

void
ffeste_R843 (ffebld expr)
{
  tree callit;
  ffelexToken msg;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

  if ((expr == NULL)
      || (ffeinfo_basictype (ffebld_info (expr))
	  == FFEINFO_basictypeANY))
    {
      msg = ffelex_token_new_character ("",
					ffelex_token_where_line (ffesta_tokens[0]),
					ffelex_token_where_column (ffesta_tokens[0]));
      expr = ffebld_new_conter (ffebld_constant_new_characterdefault (msg));
      ffelex_token_kill (msg);
      ffebld_set_info (expr, ffeinfo_new (FFEINFO_basictypeCHARACTER,
					  FFEINFO_kindtypeCHARACTERDEFAULT,
					  0, FFEINFO_kindENTITY,
					  FFEINFO_whereCONSTANT, 0));
    }
  else if (ffeinfo_basictype (ffebld_info (expr)) == FFEINFO_basictypeINTEGER)
    {
      char num[50];

      assert (ffebld_op (expr) == FFEBLD_opCONTER);
      assert (ffeinfo_kindtype (ffebld_info (expr))
	      == FFEINFO_kindtypeINTEGERDEFAULT);
      sprintf (num, "%" ffetargetIntegerDefault_f "d",
	       ffebld_constant_integer1 (ffebld_conter (expr)));
      msg = ffelex_token_new_character (num, ffelex_token_where_line (ffesta_tokens[0]),
					ffelex_token_where_column (ffesta_tokens[0]));
      expr = ffebld_new_conter (ffebld_constant_new_characterdefault (msg));
      ffelex_token_kill (msg);
      ffebld_set_info (expr, ffeinfo_new (FFEINFO_basictypeCHARACTER,
					  FFEINFO_kindtypeCHARACTERDEFAULT,
					  0, FFEINFO_kindENTITY,
					  FFEINFO_whereCONSTANT, 0));
    }
  else
    {
      assert (ffeinfo_basictype (ffebld_info (expr))
	      == FFEINFO_basictypeCHARACTER);
      assert (ffebld_op (expr) == FFEBLD_opCONTER);
      assert (ffeinfo_kindtype (ffebld_info (expr))
	      == FFEINFO_kindtypeCHARACTERDEFAULT);
    }

  /* No need to call ffeste_start_stmt_(), as the sorts of expressions
     seen here should never require use of temporaries.  */

  callit = ffecom_call_gfrt (FFECOM_gfrtPAUSE,
			     ffecom_list_ptr_to_expr (ffebld_new_item (expr, NULL)),
			     NULL_TREE);
  TREE_SIDE_EFFECTS (callit) = 1;

  expand_expr_stmt (callit);
}

/* OPEN statement.  */

void
ffeste_R904 (ffestpOpenStmt *info)
{
  tree args;
  bool iostat;
  bool errl;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

#define specified(something) (info->open_spec[something].kw_or_val_present)

  iostat = specified (FFESTP_openixIOSTAT);
  errl = specified (FFESTP_openixERR);

#undef specified

  ffeste_start_stmt_ ();

  if (errl)
    {
      ffeste_io_err_
	= ffeste_io_abort_
	= ffecom_lookup_label
	(info->open_spec[FFESTP_openixERR].u.label);
      ffeste_io_abort_is_temp_ = FALSE;
    }
  else
    {
      ffeste_io_err_ = NULL_TREE;

      if ((ffeste_io_abort_is_temp_ = iostat))
	ffeste_io_abort_ = ffecom_temp_label ();
      else
	ffeste_io_abort_ = NULL_TREE;
    }

  if (iostat)
    {
      /* Have IOSTAT= specification.  */

      ffeste_io_iostat_is_temp_ = FALSE;
      ffeste_io_iostat_ = ffecom_expr
	(info->open_spec[FFESTP_openixIOSTAT].u.expr);
    }
  else if (ffeste_io_abort_ != NULL_TREE)
    {
      /* Have no IOSTAT= but have ERR=.  */

      ffeste_io_iostat_is_temp_ = TRUE;
      ffeste_io_iostat_
	= ffecom_make_tempvar ("open", ffecom_integer_type_node,
			       FFETARGET_charactersizeNONE, -1);
    }
  else
    {
      /* No IOSTAT= or ERR= specification.  */

      ffeste_io_iostat_is_temp_ = FALSE;
      ffeste_io_iostat_ = NULL_TREE;
    }

  /* Now prescan, then convert, all the arguments.  */

  args = ffeste_io_olist_ (errl || iostat,
			   info->open_spec[FFESTP_openixUNIT].u.expr,
			   &info->open_spec[FFESTP_openixFILE],
			   &info->open_spec[FFESTP_openixSTATUS],
			   &info->open_spec[FFESTP_openixACCESS],
			   &info->open_spec[FFESTP_openixFORM],
			   &info->open_spec[FFESTP_openixRECL],
			   &info->open_spec[FFESTP_openixBLANK]);

  /* Don't generate "if (iostat != 0) goto label;" if label is temp abort
       label, since we're gonna fall through to there anyway. */

  ffeste_io_call_ (ffecom_call_gfrt (FFECOM_gfrtFOPEN, args, NULL_TREE),
		   ! ffeste_io_abort_is_temp_);

  /* If we've got a temp label, generate its code here.  */

  if (ffeste_io_abort_is_temp_)
    {
      DECL_INITIAL (ffeste_io_abort_) = error_mark_node;
      emit_nop ();
      expand_label (ffeste_io_abort_);

      assert (ffeste_io_err_ == NULL_TREE);
    }

  ffeste_end_stmt_ ();
}

/* CLOSE statement.  */

void
ffeste_R907 (ffestpCloseStmt *info)
{
  tree args;
  bool iostat;
  bool errl;

  ffeste_check_simple_ ();

  ffeste_emit_line_note_ ();

#define specified(something) (info->close_spec[something].kw_or_val_present)

  iostat = specified (FFESTP_closeixIOSTAT);
  errl = specified (FFESTP_closeixERR);

#undef specified

  ffeste_start_stmt_ ();

  if (errl)
    {
      ffeste_io_err_
	= ffeste_io_abort_
	= ffecom_lookup_label
	(info->close_spec[FFESTP_closeixERR].u.label);
      ffeste_io_abort_is_temp_ = FALSE;
    }
  else
    {
      ffeste_io_err_ = NULL_TREE;

      if ((ffeste_io_abort_is_temp_ = iostat))
	ffeste_io_abort_ = ffecom_temp_label ();
      else