trans-expr.c 138 KB
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/* Expression translation
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   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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   Free Software Foundation, Inc.
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   Contributed by Paul Brook <paul@nowt.org>
   and Steven Bosscher <s.bosscher@student.tudelft.nl>

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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */
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/* trans-expr.c-- generate GENERIC trees for gfc_expr.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "convert.h"
#include "ggc.h"
#include "toplev.h"
#include "real.h"
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#include "gimple.h"
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#include "langhooks.h"
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#include "flags.h"
#include "gfortran.h"
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#include "arith.h"
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#include "trans.h"
#include "trans-const.h"
#include "trans-types.h"
#include "trans-array.h"
/* Only for gfc_trans_assign and gfc_trans_pointer_assign.  */
#include "trans-stmt.h"
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#include "dependency.h"
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static tree gfc_trans_structure_assign (tree dest, gfc_expr * expr);
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static void gfc_apply_interface_mapping_to_expr (gfc_interface_mapping *,
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						 gfc_expr *);
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/* Copy the scalarization loop variables.  */

static void
gfc_copy_se_loopvars (gfc_se * dest, gfc_se * src)
{
  dest->ss = src->ss;
  dest->loop = src->loop;
}


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/* Initialize a simple expression holder.
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   Care must be taken when multiple se are created with the same parent.
   The child se must be kept in sync.  The easiest way is to delay creation
   of a child se until after after the previous se has been translated.  */

void
gfc_init_se (gfc_se * se, gfc_se * parent)
{
  memset (se, 0, sizeof (gfc_se));
  gfc_init_block (&se->pre);
  gfc_init_block (&se->post);

  se->parent = parent;

  if (parent)
    gfc_copy_se_loopvars (se, parent);
}


/* Advances to the next SS in the chain.  Use this rather than setting
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   se->ss = se->ss->next because all the parents needs to be kept in sync.
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   See gfc_init_se.  */

void
gfc_advance_se_ss_chain (gfc_se * se)
{
  gfc_se *p;

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  gcc_assert (se != NULL && se->ss != NULL && se->ss != gfc_ss_terminator);
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  p = se;
  /* Walk down the parent chain.  */
  while (p != NULL)
    {
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      /* Simple consistency check.  */
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      gcc_assert (p->parent == NULL || p->parent->ss == p->ss);
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      p->ss = p->ss->next;

      p = p->parent;
    }
}


/* Ensures the result of the expression as either a temporary variable
   or a constant so that it can be used repeatedly.  */

void
gfc_make_safe_expr (gfc_se * se)
{
  tree var;

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  if (CONSTANT_CLASS_P (se->expr))
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    return;

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  /* We need a temporary for this result.  */
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  var = gfc_create_var (TREE_TYPE (se->expr), NULL);
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  gfc_add_modify (&se->pre, var, se->expr);
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  se->expr = var;
}


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/* Return an expression which determines if a dummy parameter is present.
   Also used for arguments to procedures with multiple entry points.  */
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tree
gfc_conv_expr_present (gfc_symbol * sym)
{
  tree decl;

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  gcc_assert (sym->attr.dummy);
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  decl = gfc_get_symbol_decl (sym);
  if (TREE_CODE (decl) != PARM_DECL)
    {
      /* Array parameters use a temporary descriptor, we want the real
         parameter.  */
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      gcc_assert (GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (decl))
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             || GFC_ARRAY_TYPE_P (TREE_TYPE (decl)));
      decl = GFC_DECL_SAVED_DESCRIPTOR (decl);
    }
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  return fold_build2 (NE_EXPR, boolean_type_node, decl,
		      fold_convert (TREE_TYPE (decl), null_pointer_node));
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}


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/* Converts a missing, dummy argument into a null or zero.  */

void
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gfc_conv_missing_dummy (gfc_se * se, gfc_expr * arg, gfc_typespec ts, int kind)
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{
  tree present;
  tree tmp;

  present = gfc_conv_expr_present (arg->symtree->n.sym);
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  if (kind > 0)
    {
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      /* Create a temporary and convert it to the correct type.  */
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      tmp = gfc_get_int_type (kind);
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      tmp = fold_convert (tmp, build_fold_indirect_ref (se->expr));
    
      /* Test for a NULL value.  */
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      tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present, tmp,
		    fold_convert (TREE_TYPE (tmp), integer_one_node));
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      tmp = gfc_evaluate_now (tmp, &se->pre);
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      se->expr = gfc_build_addr_expr (NULL_TREE, tmp);
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    }
  else
    {
      tmp = build3 (COND_EXPR, TREE_TYPE (se->expr), present, se->expr,
		    fold_convert (TREE_TYPE (se->expr), integer_zero_node));
      tmp = gfc_evaluate_now (tmp, &se->pre);
      se->expr = tmp;
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    }
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  if (ts.type == BT_CHARACTER)
    {
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      tmp = build_int_cst (gfc_charlen_type_node, 0);
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      tmp = fold_build3 (COND_EXPR, gfc_charlen_type_node,
			 present, se->string_length, tmp);
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      tmp = gfc_evaluate_now (tmp, &se->pre);
      se->string_length = tmp;
    }
  return;
}


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/* Get the character length of an expression, looking through gfc_refs
   if necessary.  */

tree
gfc_get_expr_charlen (gfc_expr *e)
{
  gfc_ref *r;
  tree length;

  gcc_assert (e->expr_type == EXPR_VARIABLE 
	      && e->ts.type == BT_CHARACTER);
  
  length = NULL; /* To silence compiler warning.  */

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  if (is_subref_array (e) && e->ts.cl->length)
    {
      gfc_se tmpse;
      gfc_init_se (&tmpse, NULL);
      gfc_conv_expr_type (&tmpse, e->ts.cl->length, gfc_charlen_type_node);
      e->ts.cl->backend_decl = tmpse.expr;
      return tmpse.expr;
    }

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  /* First candidate: if the variable is of type CHARACTER, the
     expression's length could be the length of the character
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     variable.  */
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  if (e->symtree->n.sym->ts.type == BT_CHARACTER)
    length = e->symtree->n.sym->ts.cl->backend_decl;

  /* Look through the reference chain for component references.  */
  for (r = e->ref; r; r = r->next)
    {
      switch (r->type)
	{
	case REF_COMPONENT:
	  if (r->u.c.component->ts.type == BT_CHARACTER)
	    length = r->u.c.component->ts.cl->backend_decl;
	  break;

	case REF_ARRAY:
	  /* Do nothing.  */
	  break;

	default:
	  /* We should never got substring references here.  These will be
	     broken down by the scalarizer.  */
	  gcc_unreachable ();
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	  break;
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	}
    }

  gcc_assert (length != NULL);
  return length;
}

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/* For each character array constructor subexpression without a ts.cl->length,
   replace it by its first element (if there aren't any elements, the length
   should already be set to zero).  */

static void
flatten_array_ctors_without_strlen (gfc_expr* e)
{
  gfc_actual_arglist* arg;
  gfc_constructor* c;

  if (!e)
    return;

  switch (e->expr_type)
    {

    case EXPR_OP:
      flatten_array_ctors_without_strlen (e->value.op.op1); 
      flatten_array_ctors_without_strlen (e->value.op.op2); 
      break;

    case EXPR_COMPCALL:
      /* TODO: Implement as with EXPR_FUNCTION when needed.  */
      gcc_unreachable ();

    case EXPR_FUNCTION:
      for (arg = e->value.function.actual; arg; arg = arg->next)
	flatten_array_ctors_without_strlen (arg->expr);
      break;

    case EXPR_ARRAY:

      /* We've found what we're looking for.  */
      if (e->ts.type == BT_CHARACTER && !e->ts.cl->length)
	{
	  gfc_expr* new_expr;
	  gcc_assert (e->value.constructor);

	  new_expr = e->value.constructor->expr;
	  e->value.constructor->expr = NULL;

	  flatten_array_ctors_without_strlen (new_expr);
	  gfc_replace_expr (e, new_expr);
	  break;
	}

      /* Otherwise, fall through to handle constructor elements.  */
    case EXPR_STRUCTURE:
      for (c = e->value.constructor; c; c = c->next)
	flatten_array_ctors_without_strlen (c->expr);
      break;

    default:
      break;

    }
}

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/* Generate code to initialize a string length variable. Returns the
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   value.  For array constructors, cl->length might be NULL and in this case,
   the first element of the constructor is needed.  expr is the original
   expression so we can access it but can be NULL if this is not needed.  */
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void
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gfc_conv_string_length (gfc_charlen * cl, gfc_expr * expr, stmtblock_t * pblock)
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{
  gfc_se se;

  gfc_init_se (&se, NULL);
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  /* If cl->length is NULL, use gfc_conv_expr to obtain the string length but
     "flatten" array constructors by taking their first element; all elements
     should be the same length or a cl->length should be present.  */
  if (!cl->length)
    {
      gfc_expr* expr_flat;
      gcc_assert (expr);

      expr_flat = gfc_copy_expr (expr);
      flatten_array_ctors_without_strlen (expr_flat);
      gfc_resolve_expr (expr_flat);

      gfc_conv_expr (&se, expr_flat);
      gfc_add_block_to_block (pblock, &se.pre);
      cl->backend_decl = convert (gfc_charlen_type_node, se.string_length);

      gfc_free_expr (expr_flat);
      return;
    }

  /* Convert cl->length.  */

  gcc_assert (cl->length);

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  gfc_conv_expr_type (&se, cl->length, gfc_charlen_type_node);
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  se.expr = fold_build2 (MAX_EXPR, gfc_charlen_type_node, se.expr,
			 build_int_cst (gfc_charlen_type_node, 0));
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  gfc_add_block_to_block (pblock, &se.pre);

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  if (cl->backend_decl)
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    gfc_add_modify (pblock, cl->backend_decl, se.expr);
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  else
    cl->backend_decl = gfc_evaluate_now (se.expr, pblock);
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}

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static void
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gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind,
		    const char *name, locus *where)
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{
  tree tmp;
  tree type;
  tree var;
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  tree fault;
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  gfc_se start;
  gfc_se end;
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  char *msg;
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  type = gfc_get_character_type (kind, ref->u.ss.length);
  type = build_pointer_type (type);

  var = NULL_TREE;
  gfc_init_se (&start, se);
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  gfc_conv_expr_type (&start, ref->u.ss.start, gfc_charlen_type_node);
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  gfc_add_block_to_block (&se->pre, &start.pre);

  if (integer_onep (start.expr))
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    gfc_conv_string_parameter (se);
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  else
    {
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      /* Avoid multiple evaluation of substring start.  */
      if (!CONSTANT_CLASS_P (start.expr) && !DECL_P (start.expr))
	start.expr = gfc_evaluate_now (start.expr, &se->pre);

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      /* Change the start of the string.  */
      if (TYPE_STRING_FLAG (TREE_TYPE (se->expr)))
	tmp = se->expr;
      else
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	tmp = build_fold_indirect_ref (se->expr);
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      tmp = gfc_build_array_ref (tmp, start.expr, NULL);
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      se->expr = gfc_build_addr_expr (type, tmp);
    }

  /* Length = end + 1 - start.  */
  gfc_init_se (&end, se);
  if (ref->u.ss.end == NULL)
    end.expr = se->string_length;
  else
    {
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      gfc_conv_expr_type (&end, ref->u.ss.end, gfc_charlen_type_node);
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      gfc_add_block_to_block (&se->pre, &end.pre);
    }
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  if (!CONSTANT_CLASS_P (end.expr) && !DECL_P (end.expr))
    end.expr = gfc_evaluate_now (end.expr, &se->pre);

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  if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS)
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    {
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      tree nonempty = fold_build2 (LE_EXPR, boolean_type_node,
				   start.expr, end.expr);

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      /* Check lower bound.  */
      fault = fold_build2 (LT_EXPR, boolean_type_node, start.expr,
                           build_int_cst (gfc_charlen_type_node, 1));
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      fault = fold_build2 (TRUTH_ANDIF_EXPR, boolean_type_node,
			   nonempty, fault);
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      if (name)
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	asprintf (&msg, "Substring out of bounds: lower bound (%%ld) of '%s' "
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		  "is less than one", name);
      else
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	asprintf (&msg, "Substring out of bounds: lower bound (%%ld)"
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		  "is less than one");
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      gfc_trans_runtime_check (true, false, fault, &se->pre, where, msg,
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			       fold_convert (long_integer_type_node,
					     start.expr));
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      gfc_free (msg);

      /* Check upper bound.  */
      fault = fold_build2 (GT_EXPR, boolean_type_node, end.expr,
                           se->string_length);
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      fault = fold_build2 (TRUTH_ANDIF_EXPR, boolean_type_node,
			   nonempty, fault);
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      if (name)
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	asprintf (&msg, "Substring out of bounds: upper bound (%%ld) of '%s' "
		  "exceeds string length (%%ld)", name);
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      else
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	asprintf (&msg, "Substring out of bounds: upper bound (%%ld) "
		  "exceeds string length (%%ld)");
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      gfc_trans_runtime_check (true, false, fault, &se->pre, where, msg,
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			       fold_convert (long_integer_type_node, end.expr),
			       fold_convert (long_integer_type_node,
					     se->string_length));
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      gfc_free (msg);
    }

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  tmp = fold_build2 (MINUS_EXPR, gfc_charlen_type_node,
		     build_int_cst (gfc_charlen_type_node, 1),
		     start.expr);
  tmp = fold_build2 (PLUS_EXPR, gfc_charlen_type_node, end.expr, tmp);
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  tmp = fold_build2 (MAX_EXPR, gfc_charlen_type_node, tmp,
		     build_int_cst (gfc_charlen_type_node, 0));
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  se->string_length = tmp;
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}


/* Convert a derived type component reference.  */

static void
gfc_conv_component_ref (gfc_se * se, gfc_ref * ref)
{
  gfc_component *c;
  tree tmp;
  tree decl;
  tree field;

  c = ref->u.c.component;

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  gcc_assert (c->backend_decl);
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  field = c->backend_decl;
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  gcc_assert (TREE_CODE (field) == FIELD_DECL);
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  decl = se->expr;
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  tmp = fold_build3 (COMPONENT_REF, TREE_TYPE (field), decl, field, NULL_TREE);
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  se->expr = tmp;

  if (c->ts.type == BT_CHARACTER)
    {
      tmp = c->ts.cl->backend_decl;
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      /* Components must always be constant length.  */
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      gcc_assert (tmp && INTEGER_CST_P (tmp));
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      se->string_length = tmp;
    }

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  if ((c->attr.pointer && c->attr.dimension == 0 && c->ts.type != BT_CHARACTER)
      || c->attr.proc_pointer)
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    se->expr = build_fold_indirect_ref (se->expr);
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}


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/* This function deals with component references to components of the
   parent type for derived type extensons.  */
static void
conv_parent_component_references (gfc_se * se, gfc_ref * ref)
{
  gfc_component *c;
  gfc_component *cmp;
  gfc_symbol *dt;
  gfc_ref parent;

  dt = ref->u.c.sym;
  c = ref->u.c.component;

  /* Build a gfc_ref to recursively call gfc_conv_component_ref.  */
  parent.type = REF_COMPONENT;
  parent.next = NULL;
  parent.u.c.sym = dt;
  parent.u.c.component = dt->components;

  if (dt->attr.extension && dt->components)
    {
      /* Return if the component is not in the parent type.  */
      for (cmp = dt->components->next; cmp; cmp = cmp->next)
	if (strcmp (c->name, cmp->name) == 0)
	  return;
	
      /* Otherwise build the reference and call self.  */
      gfc_conv_component_ref (se, &parent);
      parent.u.c.sym = dt->components->ts.derived;
      parent.u.c.component = c;
      conv_parent_component_references (se, &parent);
    }
}

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/* Return the contents of a variable. Also handles reference/pointer
   variables (all Fortran pointer references are implicit).  */

static void
gfc_conv_variable (gfc_se * se, gfc_expr * expr)
{
  gfc_ref *ref;
  gfc_symbol *sym;
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  tree parent_decl;
  int parent_flag;
  bool return_value;
  bool alternate_entry;
  bool entry_master;
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  sym = expr->symtree->n.sym;
  if (se->ss != NULL)
    {
      /* Check that something hasn't gone horribly wrong.  */
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      gcc_assert (se->ss != gfc_ss_terminator);
      gcc_assert (se->ss->expr == expr);
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      /* A scalarized term.  We already know the descriptor.  */
      se->expr = se->ss->data.info.descriptor;
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      se->string_length = se->ss->string_length;
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      for (ref = se->ss->data.info.ref; ref; ref = ref->next)
	if (ref->type == REF_ARRAY && ref->u.ar.type != AR_ELEMENT)
	  break;
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    }
  else
    {
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      tree se_expr = NULL_TREE;

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      se->expr = gfc_get_symbol_decl (sym);
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      /* Deal with references to a parent results or entries by storing
	 the current_function_decl and moving to the parent_decl.  */
      return_value = sym->attr.function && sym->result == sym;
      alternate_entry = sym->attr.function && sym->attr.entry
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			&& sym->result == sym;
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      entry_master = sym->attr.result
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		     && sym->ns->proc_name->attr.entry_master
		     && !gfc_return_by_reference (sym->ns->proc_name);
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      parent_decl = DECL_CONTEXT (current_function_decl);

      if ((se->expr == parent_decl && return_value)
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	   || (sym->ns && sym->ns->proc_name
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	       && parent_decl
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	       && sym->ns->proc_name->backend_decl == parent_decl
	       && (alternate_entry || entry_master)))
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	parent_flag = 1;
      else
	parent_flag = 0;

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      /* Special case for assigning the return value of a function.
	 Self recursive functions must have an explicit return value.  */
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      if (return_value && (se->expr == current_function_decl || parent_flag))
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	se_expr = gfc_get_fake_result_decl (sym, parent_flag);
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      /* Similarly for alternate entry points.  */
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      else if (alternate_entry 
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	       && (sym->ns->proc_name->backend_decl == current_function_decl
		   || parent_flag))
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	{
	  gfc_entry_list *el = NULL;

	  for (el = sym->ns->entries; el; el = el->next)
	    if (sym == el->sym)
	      {
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		se_expr = gfc_get_fake_result_decl (sym, parent_flag);
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		break;
	      }
	}

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      else if (entry_master
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	       && (sym->ns->proc_name->backend_decl == current_function_decl
		   || parent_flag))
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	se_expr = gfc_get_fake_result_decl (sym, parent_flag);
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      if (se_expr)
	se->expr = se_expr;

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      /* Procedure actual arguments.  */
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      else if (sym->attr.flavor == FL_PROCEDURE
	       && se->expr != current_function_decl)
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	{
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	  if (!sym->attr.dummy && !sym->attr.proc_pointer)
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	    {
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	      gcc_assert (TREE_CODE (se->expr) == FUNCTION_DECL);
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	      se->expr = gfc_build_addr_expr (NULL_TREE, se->expr);
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	    }
	  return;
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	}


      /* Dereference the expression, where needed. Since characters
	 are entirely different from other types, they are treated 
	 separately.  */
      if (sym->ts.type == BT_CHARACTER)
	{
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	  /* Dereference character pointer dummy arguments
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	     or results.  */
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	  if ((sym->attr.pointer || sym->attr.allocatable)
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	      && (sym->attr.dummy
		  || sym->attr.function
		  || sym->attr.result))
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	    se->expr = build_fold_indirect_ref (se->expr);
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	}
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      else if (!sym->attr.value)
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	{
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          /* Dereference non-character scalar dummy arguments.  */
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	  if (sym->attr.dummy && !sym->attr.dimension)
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	    se->expr = build_fold_indirect_ref (se->expr);
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          /* Dereference scalar hidden result.  */
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	  if (gfc_option.flag_f2c && sym->ts.type == BT_COMPLEX
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	      && (sym->attr.function || sym->attr.result)
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	      && !sym->attr.dimension && !sym->attr.pointer
	      && !sym->attr.always_explicit)
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	    se->expr = build_fold_indirect_ref (se->expr);
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          /* Dereference non-character pointer variables. 
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	     These must be dummies, results, or scalars.  */
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	  if ((sym->attr.pointer || sym->attr.allocatable)
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	      && (sym->attr.dummy
		  || sym->attr.function
		  || sym->attr.result
		  || !sym->attr.dimension))
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	    se->expr = build_fold_indirect_ref (se->expr);
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	}

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      ref = expr->ref;
    }

  /* For character variables, also get the length.  */
  if (sym->ts.type == BT_CHARACTER)
    {
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      /* If the character length of an entry isn't set, get the length from
         the master function instead.  */
      if (sym->attr.entry && !sym->ts.cl->backend_decl)
        se->string_length = sym->ns->proc_name->ts.cl->backend_decl;
      else
        se->string_length = sym->ts.cl->backend_decl;
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      gcc_assert (se->string_length);
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    }

  while (ref)
    {
      switch (ref->type)
	{
	case REF_ARRAY:
	  /* Return the descriptor if that's what we want and this is an array
	     section reference.  */
	  if (se->descriptor_only && ref->u.ar.type != AR_ELEMENT)
	    return;
/* TODO: Pointers to single elements of array sections, eg elemental subs.  */
	  /* Return the descriptor for array pointers and allocations.  */
	  if (se->want_pointer
	      && ref->next == NULL && (se->descriptor_only))
	    return;

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	  gfc_conv_array_ref (se, &ref->u.ar, sym, &expr->where);
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	  /* Return a pointer to an element.  */
	  break;

	case REF_COMPONENT:
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	  if (ref->u.c.sym->attr.extension)
	    conv_parent_component_references (se, ref);

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	  gfc_conv_component_ref (se, ref);
	  break;

	case REF_SUBSTRING:
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	  gfc_conv_substring (se, ref, expr->ts.kind,
			      expr->symtree->name, &expr->where);
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	  break;

	default:
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	  gcc_unreachable ();
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	  break;
	}
      ref = ref->next;
    }
  /* Pointer assignment, allocation or pass by reference.  Arrays are handled
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     separately.  */
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  if (se->want_pointer)
    {
      if (expr->ts.type == BT_CHARACTER)
	gfc_conv_string_parameter (se);
      else 
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	se->expr = gfc_build_addr_expr (NULL_TREE, se->expr);
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    }
}


/* Unary ops are easy... Or they would be if ! was a valid op.  */

static void
gfc_conv_unary_op (enum tree_code code, gfc_se * se, gfc_expr * expr)
{
  gfc_se operand;
  tree type;

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  gcc_assert (expr->ts.type != BT_CHARACTER);
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  /* Initialize the operand.  */
  gfc_init_se (&operand, se);
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  gfc_conv_expr_val (&operand, expr->value.op.op1);
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  gfc_add_block_to_block (&se->pre, &operand.pre);

  type = gfc_typenode_for_spec (&expr->ts);

  /* TRUTH_NOT_EXPR is not a "true" unary operator in GCC.
     We must convert it to a compare to 0 (e.g. EQ_EXPR (op1, 0)).
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     All other unary operators have an equivalent GIMPLE unary operator.  */
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  if (code == TRUTH_NOT_EXPR)
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    se->expr = fold_build2 (EQ_EXPR, type, operand.expr,
			    build_int_cst (type, 0));
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  else
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    se->expr = fold_build1 (code, type, operand.expr);
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}

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/* Expand power operator to optimal multiplications when a value is raised
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   to a constant integer n. See section 4.6.3, "Evaluation of Powers" of
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   Donald E. Knuth, "Seminumerical Algorithms", Vol. 2, "The Art of Computer
   Programming", 3rd Edition, 1998.  */

/* This code is mostly duplicated from expand_powi in the backend.
   We establish the "optimal power tree" lookup table with the defined size.
   The items in the table are the exponents used to calculate the index
   exponents. Any integer n less than the value can get an "addition chain",
   with the first node being one.  */
#define POWI_TABLE_SIZE 256

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/* The table is from builtins.c.  */
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static const unsigned char powi_table[POWI_TABLE_SIZE] =
  {
      0,   1,   1,   2,   2,   3,   3,   4,  /*   0 -   7 */
      4,   6,   5,   6,   6,  10,   7,   9,  /*   8 -  15 */
      8,  16,   9,  16,  10,  12,  11,  13,  /*  16 -  23 */
     12,  17,  13,  18,  14,  24,  15,  26,  /*  24 -  31 */
     16,  17,  17,  19,  18,  33,  19,  26,  /*  32 -  39 */
     20,  25,  21,  40,  22,  27,  23,  44,  /*  40 -  47 */
     24,  32,  25,  34,  26,  29,  27,  44,  /*  48 -  55 */
     28,  31,  29,  34,  30,  60,  31,  36,  /*  56 -  63 */
     32,  64,  33,  34,  34,  46,  35,  37,  /*  64 -  71 */
     36,  65,  37,  50,  38,  48,  39,  69,  /*  72 -  79 */
     40,  49,  41,  43,  42,  51,  43,  58,  /*  80 -  87 */
     44,  64,  45,  47,  46,  59,  47,  76,  /*  88 -  95 */
     48,  65,  49,  66,  50,  67,  51,  66,  /*  96 - 103 */
     52,  70,  53,  74,  54, 104,  55,  74,  /* 104 - 111 */
     56,  64,  57,  69,  58,  78,  59,  68,  /* 112 - 119 */
     60,  61,  61,  80,  62,  75,  63,  68,  /* 120 - 127 */
     64,  65,  65, 128,  66, 129,  67,  90,  /* 128 - 135 */
     68,  73,  69, 131,  70,  94,  71,  88,  /* 136 - 143 */
     72, 128,  73,  98,  74, 132,  75, 121,  /* 144 - 151 */
     76, 102,  77, 124,  78, 132,  79, 106,  /* 152 - 159 */
     80,  97,  81, 160,  82,  99,  83, 134,  /* 160 - 167 */
     84,  86,  85,  95,  86, 160,  87, 100,  /* 168 - 175 */
     88, 113,  89,  98,  90, 107,  91, 122,  /* 176 - 183 */
     92, 111,  93, 102,  94, 126,  95, 150,  /* 184 - 191 */
     96, 128,  97, 130,  98, 133,  99, 195,  /* 192 - 199 */
    100, 128, 101, 123, 102, 164, 103, 138,  /* 200 - 207 */
    104, 145, 105, 146, 106, 109, 107, 149,  /* 208 - 215 */
    108, 200, 109, 146, 110, 170, 111, 157,  /* 216 - 223 */
    112, 128, 113, 130, 114, 182, 115, 132,  /* 224 - 231 */
    116, 200, 117, 132, 118, 158, 119, 206,  /* 232 - 239 */
    120, 240, 121, 162, 122, 147, 123, 152,  /* 240 - 247 */
    124, 166, 125, 214, 126, 138, 127, 153,  /* 248 - 255 */
  };

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/* If n is larger than lookup table's max index, we use the "window 
   method".  */
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#define POWI_WINDOW_SIZE 3

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/* Recursive function to expand the power operator. The temporary 
   values are put in tmpvar. The function returns tmpvar[1] ** n.  */
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static tree
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gfc_conv_powi (gfc_se * se, unsigned HOST_WIDE_INT n, tree * tmpvar)
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{
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  tree op0;
  tree op1;
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  tree tmp;
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  int digit;
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  if (n < POWI_TABLE_SIZE)
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    {
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      if (tmpvar[n])
        return tmpvar[n];
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      op0 = gfc_conv_powi (se, n - powi_table[n], tmpvar);
      op1 = gfc_conv_powi (se, powi_table[n], tmpvar);
    }
  else if (n & 1)
    {
      digit = n & ((1 << POWI_WINDOW_SIZE) - 1);
      op0 = gfc_conv_powi (se, n - digit, tmpvar);
      op1 = gfc_conv_powi (se, digit, tmpvar);
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    }
  else
    {
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      op0 = gfc_conv_powi (se, n >> 1, tmpvar);
      op1 = op0;
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    }

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  tmp = fold_build2 (MULT_EXPR, TREE_TYPE (op0), op0, op1);
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  tmp = gfc_evaluate_now (tmp, &se->pre);
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  if (n < POWI_TABLE_SIZE)
    tmpvar[n] = tmp;
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  return tmp;
}
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/* Expand lhs ** rhs. rhs is a constant integer. If it expands successfully,
   return 1. Else return 0 and a call to runtime library functions
   will have to be built.  */
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static int
gfc_conv_cst_int_power (gfc_se * se, tree lhs, tree rhs)
{
  tree cond;
  tree tmp;
  tree type;
  tree vartmp[POWI_TABLE_SIZE];
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  HOST_WIDE_INT m;
  unsigned HOST_WIDE_INT n;
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  int sgn;
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  /* If exponent is too large, we won't expand it anyway, so don't bother
     with large integer values.  */
  if (!double_int_fits_in_shwi_p (TREE_INT_CST (rhs)))
    return 0;

  m = double_int_to_shwi (TREE_INT_CST (rhs));
  /* There's no ABS for HOST_WIDE_INT, so here we go. It also takes care
     of the asymmetric range of the integer type.  */
  n = (unsigned HOST_WIDE_INT) (m < 0 ? -m : m);
  
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  type = TREE_TYPE (lhs);
  sgn = tree_int_cst_sgn (rhs);
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  if (((FLOAT_TYPE_P (type) && !flag_unsafe_math_optimizations)
       || optimize_size) && (m > 2 || m < -1))
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    return 0;
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  /* rhs == 0  */
  if (sgn == 0)
    {
      se->expr = gfc_build_const (type, integer_one_node);
      return 1;
    }
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  /* If rhs < 0 and lhs is an integer, the result is -1, 0 or 1.  */
  if ((sgn == -1) && (TREE_CODE (type) == INTEGER_TYPE))
    {
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      tmp = fold_build2 (EQ_EXPR, boolean_type_node,
			 lhs, build_int_cst (TREE_TYPE (lhs), -1));
      cond = fold_build2 (EQ_EXPR, boolean_type_node,
			  lhs, build_int_cst (TREE_TYPE (lhs), 1));
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      /* If rhs is even,
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	 result = (lhs == 1 || lhs == -1) ? 1 : 0.  */
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      if ((n & 1) == 0)
        {
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	  tmp = fold_build2 (TRUTH_OR_EXPR, boolean_type_node, tmp, cond);
	  se->expr = fold_build3 (COND_EXPR, type,
				  tmp, build_int_cst (type, 1),
				  build_int_cst (type, 0));
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	  return 1;
	}
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      /* If rhs is odd,
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	 result = (lhs == 1) ? 1 : (lhs == -1) ? -1 : 0.  */
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      tmp = fold_build3 (COND_EXPR, type, tmp, build_int_cst (type, -1),
			 build_int_cst (type, 0));
      se->expr = fold_build3 (COND_EXPR, type,
			      cond, build_int_cst (type, 1), tmp);
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      return 1;
    }
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  memset (vartmp, 0, sizeof (vartmp));
  vartmp[1] = lhs;
  if (sgn == -1)
    {
      tmp = gfc_build_const (type, integer_one_node);
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      vartmp[1] = fold_build2 (RDIV_EXPR, type, tmp, vartmp[1]);
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    }
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  se->expr = gfc_conv_powi (se, n, vartmp);

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  return 1;
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}


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/* Power op (**).  Constant integer exponent has special handling.  */
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static void
gfc_conv_power_op (gfc_se * se, gfc_expr * expr)
{
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  tree gfc_int4_type_node;
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  int kind;
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  int ikind;
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  gfc_se lse;
  gfc_se rse;
  tree fndecl;

  gfc_init_se (&lse, se);
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  gfc_conv_expr_val (&lse, expr->value.op.op1);
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  lse.expr = gfc_evaluate_now (lse.expr, &lse.pre);
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  gfc_add_block_to_block (&se->pre, &lse.pre);

  gfc_init_se (&rse, se);
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  gfc_conv_expr_val (&rse, expr->value.op.op2);
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  gfc_add_block_to_block (&se->pre, &rse.pre);

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  if (expr->value.op.op2->ts.type == BT_INTEGER
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      && expr->value.op.op2->expr_type == EXPR_CONSTANT)
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    if (gfc_conv_cst_int_power (se, lse.expr, rse.expr))
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      return;
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  gfc_int4_type_node = gfc_get_int_type (4);

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  kind = expr->value.op.op1->ts.kind;
  switch (expr->value.op.op2->ts.type)
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    {
    case BT_INTEGER:
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      ikind = expr->value.op.op2->ts.kind;
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      switch (ikind)
	{
	case 1:
	case 2:
	  rse.expr = convert (gfc_int4_type_node, rse.expr);
	  /* Fall through.  */

	case 4:
	  ikind = 0;
	  break;
	  
	case 8:
	  ikind = 1;
	  break;

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	case 16:
	  ikind = 2;
	  break;

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	default:
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	  gcc_unreachable ();
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	}
      switch (kind)
	{
	case 1:
	case 2:
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	  if (expr->value.op.op1->ts.type == BT_INTEGER)
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	    lse.expr = convert (gfc_int4_type_node, lse.expr);
	  else
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	    gcc_unreachable ();
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	  /* Fall through.  */

	case 4:
	  kind = 0;
	  break;
	  
	case 8:
	  kind = 1;
	  break;

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	case 10:
	  kind = 2;
	  break;

	case 16:
	  kind = 3;
	  break;

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	default:
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	  gcc_unreachable ();
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	}
      
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      switch (expr->value.op.op1->ts.type)
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	{
	case BT_INTEGER:
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	  if (kind == 3) /* Case 16 was not handled properly above.  */
	    kind = 2;
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	  fndecl = gfor_fndecl_math_powi[kind][ikind].integer;
	  break;

	case BT_REAL:
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	  /* Use builtins for real ** int4.  */
	  if (ikind == 0)
	    {
	      switch (kind)
		{
		case 0:
		  fndecl = built_in_decls[BUILT_IN_POWIF];
		  break;
		
		case 1:
		  fndecl = built_in_decls[BUILT_IN_POWI];
		  break;

		case 2:
		case 3:
		  fndecl = built_in_decls[BUILT_IN_POWIL];
		  break;

		default:
		  gcc_unreachable ();
		}
	    }
	  else
	    fndecl = gfor_fndecl_math_powi[kind][ikind].real;
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	  break;

	case BT_COMPLEX:
	  fndecl = gfor_fndecl_math_powi[kind][ikind].cmplx;
	  break;

	default:
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	  gcc_unreachable ();
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 	}
      break;
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    case BT_REAL:
      switch (kind)
	{
	case 4:
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	  fndecl = built_in_decls[BUILT_IN_POWF];
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	  break;
	case 8:
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	  fndecl = built_in_decls[BUILT_IN_POW];
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	  break;
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	case 10:
	case 16:
	  fndecl = built_in_decls[BUILT_IN_POWL];
	  break;
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	default:
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	  gcc_unreachable ();
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	}
      break;

    case BT_COMPLEX:
      switch (kind)
	{
	case 4:
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	  fndecl = built_in_decls[BUILT_IN_CPOWF];
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	  break;
	case 8:
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	  fndecl = built_in_decls[BUILT_IN_CPOW];
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	  break;
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	case 10:
	case 16:
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	  fndecl = built_in_decls[BUILT_IN_CPOWL];
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	  break;
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	default:
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	  gcc_unreachable ();
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	}
      break;

    default:
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      gcc_unreachable ();
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      break;
    }

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  se->expr = build_call_expr (fndecl, 2, lse.expr, rse.expr);
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}


/* Generate code to allocate a string temporary.  */

tree
gfc_conv_string_tmp (gfc_se * se, tree type, tree len)
{
  tree var;
  tree tmp;

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  gcc_assert (TREE_TYPE (len) == gfc_charlen_type_node);
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  if (gfc_can_put_var_on_stack (len))
    {
      /* Create a temporary variable to hold the result.  */
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      tmp = fold_build2 (MINUS_EXPR, gfc_charlen_type_node, len,
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			 build_int_cst (gfc_charlen_type_node, 1));
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      tmp = build_range_type (gfc_array_index_type, gfc_index_zero_node, tmp);
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      if (TREE_CODE (TREE_TYPE (type)) == ARRAY_TYPE)
	tmp = build_array_type (TREE_TYPE (TREE_TYPE (type)), tmp);
      else
	tmp = build_array_type (TREE_TYPE (type), tmp);

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      var = gfc_create_var (tmp, "str");
      var = gfc_build_addr_expr (type, var);
    }
  else
    {
      /* Allocate a temporary to hold the result.  */
      var = gfc_create_var (type, "pstr");
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      tmp = gfc_call_malloc (&se->pre, type,
			     fold_build2 (MULT_EXPR, TREE_TYPE (len), len,
					  fold_convert (TREE_TYPE (len),
							TYPE_SIZE (type))));
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      gfc_add_modify (&se->pre, var, tmp);
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      /* Free the temporary afterwards.  */
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      tmp = gfc_call_free (convert (pvoid_type_node, var));
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      gfc_add_expr_to_block (&se->post, tmp);
    }

  return var;
}


/* Handle a string concatenation operation.  A temporary will be allocated to
   hold the result.  */

static void
gfc_conv_concat_op (gfc_se * se, gfc_expr * expr)
{
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  gfc_se lse, rse;
  tree len, type, var, tmp, fndecl;
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  gcc_assert (expr->value.op.op1->ts.type == BT_CHARACTER
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	      && expr->value.op.op2->ts.type == BT_CHARACTER);
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  gcc_assert (expr->value.op.op1->ts.kind == expr->value.op.op2->ts.kind);
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  gfc_init_se (&lse, se);
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  gfc_conv_expr (&lse, expr->value.op.op1);
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  gfc_conv_string_parameter (&lse);
  gfc_init_se (&rse, se);
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  gfc_conv_expr (&rse, expr->value.op.op2);
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  gfc_conv_string_parameter (&rse);

  gfc_add_block_to_block (&se->pre, &lse.pre);
  gfc_add_block_to_block (&se->pre, &rse.pre);

  type = gfc_get_character_type (expr->ts.kind, expr->ts.cl);
  len = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
  if (len == NULL_TREE)
    {
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      len = fold_build2 (PLUS_EXPR, TREE_TYPE (lse.string_length),
			 lse.string_length, rse.string_length);
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    }

  type = build_pointer_type (type);

  var = gfc_conv_string_tmp (se, type, len);

  /* Do the actual concatenation.  */
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  if (expr->ts.kind == 1)
    fndecl = gfor_fndecl_concat_string;
  else if (expr->ts.kind == 4)
    fndecl = gfor_fndecl_concat_string_char4;
  else
    gcc_unreachable ();

  tmp = build_call_expr (fndecl, 6, len, var, lse.string_length, lse.expr,
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			 rse.string_length, rse.expr);
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  gfc_add_expr_to_block (&se->pre, tmp);

  /* Add the cleanup for the operands.  */
  gfc_add_block_to_block (&se->pre, &rse.post);
  gfc_add_block_to_block (&se->pre, &lse.post);

  se->expr = var;
  se->string_length = len;
}

/* Translates an op expression. Common (binary) cases are handled by this
   function, others are passed on. Recursion is used in either case.
   We use the fact that (op1.ts == op2.ts) (except for the power
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   operator **).
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   Operators need no special handling for scalarized expressions as long as
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   they call gfc_conv_simple_val to get their operands.
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   Character strings get special handling.  */

static void
gfc_conv_expr_op (gfc_se * se, gfc_expr * expr)
{
  enum tree_code code;
  gfc_se lse;
  gfc_se rse;
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  tree tmp, type;
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  int lop;
  int checkstring;

  checkstring = 0;
  lop = 0;
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  switch (expr->value.op.op)
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    {
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    case INTRINSIC_PARENTHESES:
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      if (expr->ts.type == BT_REAL
	  || expr->ts.type == BT_COMPLEX)
	{
	  gfc_conv_unary_op (PAREN_EXPR, se, expr);
	  gcc_assert (FLOAT_TYPE_P (TREE_TYPE (se->expr)));
	  return;
	}

      /* Fallthrough.  */
    case INTRINSIC_UPLUS:
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      gfc_conv_expr (se, expr->value.op.op1);
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      return;

    case INTRINSIC_UMINUS:
      gfc_conv_unary_op (NEGATE_EXPR, se, expr);
      return;

    case INTRINSIC_NOT:
      gfc_conv_unary_op (TRUTH_NOT_EXPR, se, expr);
      return;

    case INTRINSIC_PLUS:
      code = PLUS_EXPR;
      break;

    case INTRINSIC_MINUS:
      code = MINUS_EXPR;
      break;

    case INTRINSIC_TIMES:
      code = MULT_EXPR;
      break;

    case INTRINSIC_DIVIDE:
      /* If expr is a real or complex expr, use an RDIV_EXPR. If op1 is
         an integer, we must round towards zero, so we use a
         TRUNC_DIV_EXPR.  */
      if (expr->ts.type == BT_INTEGER)
	code = TRUNC_DIV_EXPR;
      else
	code = RDIV_EXPR;
      break;

    case INTRINSIC_POWER:
      gfc_conv_power_op (se, expr);
      return;

    case INTRINSIC_CONCAT:
      gfc_conv_concat_op (se, expr);
      return;

    case INTRINSIC_AND:
      code = TRUTH_ANDIF_EXPR;
      lop = 1;
      break;

    case INTRINSIC_OR:
      code = TRUTH_ORIF_EXPR;
      lop = 1;
      break;

      /* EQV and NEQV only work on logicals, but since we represent them
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         as integers, we can use EQ_EXPR and NE_EXPR for them in GIMPLE.  */
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    case INTRINSIC_EQ:
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    case INTRINSIC_EQ_OS:
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    case INTRINSIC_EQV:
      code = EQ_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_NE:
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    case INTRINSIC_NE_OS:
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    case INTRINSIC_NEQV:
      code = NE_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_GT:
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    case INTRINSIC_GT_OS:
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      code = GT_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_GE:
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    case INTRINSIC_GE_OS:
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      code = GE_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_LT:
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    case INTRINSIC_LT_OS:
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      code = LT_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_LE:
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    case INTRINSIC_LE_OS:
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      code = LE_EXPR;
      checkstring = 1;
      lop = 1;
      break;

    case INTRINSIC_USER:
    case INTRINSIC_ASSIGN:
      /* These should be converted into function calls by the frontend.  */
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      gcc_unreachable ();
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    default:
      fatal_error ("Unknown intrinsic op");
      return;
    }

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  /* The only exception to this is **, which is handled separately anyway.  */
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  gcc_assert (expr->value.op.op1->ts.type == expr->value.op.op2->ts.type);
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  if (checkstring && expr->value.op.op1->ts.type != BT_CHARACTER)
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    checkstring = 0;

  /* lhs */
  gfc_init_se (&lse, se);
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  gfc_conv_expr (&lse, expr->value.op.op1);
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  gfc_add_block_to_block (&se->pre, &lse.pre);

  /* rhs */
  gfc_init_se (&rse, se);
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  gfc_conv_expr (&rse, expr->value.op.op2);
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  gfc_add_block_to_block (&se->pre, &rse.pre);

  if (checkstring)
    {
      gfc_conv_string_parameter (&lse);
      gfc_conv_string_parameter (&rse);

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      lse.expr = gfc_build_compare_string (lse.string_length, lse.expr,
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					   rse.string_length, rse.expr,
					   expr->value.op.op1->ts.kind);
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      rse.expr = build_int_cst (TREE_TYPE (lse.expr), 0);
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      gfc_add_block_to_block (&lse.post, &rse.post);
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    }

  type = gfc_typenode_for_spec (&expr->ts);

  if (lop)
    {
      /* The result of logical ops is always boolean_type_node.  */
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      tmp = fold_build2 (code, boolean_type_node, lse.expr, rse.expr);
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      se->expr = convert (type, tmp);
    }
  else
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    se->expr = fold_build2 (code, type, lse.expr, rse.expr);
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  /* Add the post blocks.  */
  gfc_add_block_to_block (&se->post, &rse.post);
  gfc_add_block_to_block (&se->post, &lse.post);
}

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/* If a string's length is one, we convert it to a single character.  */

static tree
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string_to_single_character (tree len, tree str, int kind)
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{
  gcc_assert (POINTER_TYPE_P (TREE_TYPE (str)));

  if (INTEGER_CST_P (len) && TREE_INT_CST_LOW (len) == 1
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      && TREE_INT_CST_HIGH (len) == 0)
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    {
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      str = fold_convert (gfc_get_pchar_type (kind), str);
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      return build_fold_indirect_ref (str);
    }

  return NULL_TREE;
}

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void
gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr)
{

  if (sym->backend_decl)
    {
      /* This becomes the nominal_type in
	 function.c:assign_parm_find_data_types.  */
      TREE_TYPE (sym->backend_decl) = unsigned_char_type_node;
      /* This becomes the passed_type in
	 function.c:assign_parm_find_data_types.  C promotes char to
	 integer for argument passing.  */
      DECL_ARG_TYPE (sym->backend_decl) = unsigned_type_node;

      DECL_BY_REFERENCE (sym->backend_decl) = 0;
    }

  if (expr != NULL)
    {
      /* If we have a constant character expression, make it into an
	 integer.  */
      if ((*expr)->expr_type == EXPR_CONSTANT)
        {
	  gfc_typespec ts;
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          gfc_clear_ts (&ts);
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	  *expr = gfc_int_expr ((int)(*expr)->value.character.string[0]);
	  if ((*expr)->ts.kind != gfc_c_int_kind)
	    {
  	      /* The expr needs to be compatible with a C int.  If the 
		 conversion fails, then the 2 causes an ICE.  */
	      ts.type = BT_INTEGER;
	      ts.kind = gfc_c_int_kind;
	      gfc_convert_type (*expr, &ts, 2);
	    }
	}
      else if (se != NULL && (*expr)->expr_type == EXPR_VARIABLE)
        {
	  if ((*expr)->ref == NULL)
	    {
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	      se->expr = string_to_single_character
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		(build_int_cst (integer_type_node, 1),
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		 gfc_build_addr_expr (gfc_get_pchar_type ((*expr)->ts.kind),
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				      gfc_get_symbol_decl
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				      ((*expr)->symtree->n.sym)),
		 (*expr)->ts.kind);
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	    }
	  else
	    {
	      gfc_conv_variable (se, *expr);
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	      se->expr = string_to_single_character
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		(build_int_cst (integer_type_node, 1),
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		 gfc_build_addr_expr (gfc_get_pchar_type ((*expr)->ts.kind),
				      se->expr),
		 (*expr)->ts.kind);
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	    }
	}
    }
}


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/* Compare two strings. If they are all single characters, the result is the
   subtraction of them. Otherwise, we build a library call.  */

tree
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gfc_build_compare_string (tree len1, tree str1, tree len2, tree str2, int kind)
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{
  tree sc1;
  tree sc2;
  tree tmp;

  gcc_assert (POINTER_TYPE_P (TREE_TYPE (str1)));
  gcc_assert (POINTER_TYPE_P (TREE_TYPE (str2)));

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  sc1 = string_to_single_character (len1, str1, kind);
  sc2 = string_to_single_character (len2, str2, kind);
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  if (sc1 != NULL_TREE && sc2 != NULL_TREE)
    {
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      /* Deal with single character specially.  */
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      sc1 = fold_convert (integer_type_node, sc1);
      sc2 = fold_convert (integer_type_node, sc2);
      tmp = fold_build2 (MINUS_EXPR, integer_type_node, sc1, sc2);
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    }
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  else
    {
      /* Build a call for the comparison.  */
      tree fndecl;

      if (kind == 1)
	fndecl = gfor_fndecl_compare_string;
      else if (kind == 4)
	fndecl = gfor_fndecl_compare_string_char4;
      else
	gcc_unreachable ();

      tmp = build_call_expr (fndecl, 4, len1, str1, len2, str2);
    }

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  return tmp;
}
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static void
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conv_function_val (gfc_se * se, gfc_symbol * sym, gfc_expr * expr)
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{
  tree tmp;

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  if (is_proc_ptr_comp (expr, NULL))
    tmp = gfc_get_proc_ptr_comp (se, expr);
  else if (sym->attr.dummy)
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    {
      tmp = gfc_get_symbol_decl (sym);
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      if (sym->attr.proc_pointer)
        tmp = build_fold_indirect_ref (tmp);
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      gcc_assert (TREE_CODE (TREE_TYPE (tmp)) == POINTER_TYPE
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	      && TREE_CODE (TREE_TYPE (TREE_TYPE (tmp))) == FUNCTION_TYPE);
    }
  else
    {
      if (!sym->backend_decl)
	sym->backend_decl = gfc_get_extern_function_decl (sym);

      tmp = sym->backend_decl;
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      if (sym->attr.cray_pointee)
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	{
	  /* TODO - make the cray pointee a pointer to a procedure,
	     assign the pointer to it and use it for the call.  This
	     will do for now!  */
	  tmp = convert (build_pointer_type (TREE_TYPE (tmp)),
			 gfc_get_symbol_decl (sym->cp_pointer));
	  tmp = gfc_evaluate_now (tmp, &se->pre);
	}

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      if (!POINTER_TYPE_P (TREE_TYPE (tmp)))
	{
	  gcc_assert (TREE_CODE (tmp) == FUNCTION_DECL);
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	  tmp = gfc_build_addr_expr (NULL_TREE, tmp);
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	}
    }
  se->expr = tmp;
}


/* Initialize MAPPING.  */

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void
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gfc_init_interface_mapping (gfc_interface_mapping * mapping)
{
  mapping->syms = NULL;
  mapping->charlens = NULL;
}


/* Free all memory held by MAPPING (but not MAPPING itself).  */

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void
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gfc_free_interface_mapping (gfc_interface_mapping * mapping)
{
  gfc_interface_sym_mapping *sym;
  gfc_interface_sym_mapping *nextsym;
  gfc_charlen *cl;
  gfc_charlen *nextcl;

  for (sym = mapping->syms; sym; sym = nextsym)
    {
      nextsym = sym->next;
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      sym->new_sym->n.sym->formal = NULL;
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      gfc_free_symbol (sym->new_sym->n.sym);
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      gfc_free_expr (sym->expr);
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      gfc_free (sym->new_sym);
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      gfc_free (sym);
    }
  for (cl = mapping->charlens; cl; cl = nextcl)
    {
      nextcl = cl->next;
      gfc_free_expr (cl->length);
      gfc_free (cl);
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    }
}


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/* Return a copy of gfc_charlen CL.  Add the returned structure to
   MAPPING so that it will be freed by gfc_free_interface_mapping.  */

static gfc_charlen *
gfc_get_interface_mapping_charlen (gfc_interface_mapping * mapping,
				   gfc_charlen * cl)
{
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  gfc_charlen *new_charlen;
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  new_charlen = gfc_get_charlen ();
  new_charlen->next = mapping->charlens;
  new_charlen->length = gfc_copy_expr (cl->length);
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  mapping->charlens = new_charlen;
  return new_charlen;
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}


/* A subroutine of gfc_add_interface_mapping.  Return a descriptorless
   array variable that can be used as the actual argument for dummy
   argument SYM.  Add any initialization code to BLOCK.  PACKED is as
   for gfc_get_nodesc_array_type and DATA points to the first element
   in the passed array.  */

static tree
gfc_get_interface_mapping_array (stmtblock_t * block, gfc_symbol * sym,
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				 gfc_packed packed, tree data)
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{
  tree type;
  tree var;

  type = gfc_typenode_for_spec (&sym->ts);
  type = gfc_get_nodesc_array_type (type, sym->as, packed);

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  var = gfc_create_var (type, "ifm");
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  gfc_add_modify (block, var, fold_convert (type, data));
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  return var;
}


/* A subroutine of gfc_add_interface_mapping.  Set the stride, upper bounds
   and offset of descriptorless array type TYPE given that it has the same
   size as DESC.  Add any set-up code to BLOCK.  */

static void
gfc_set_interface_mapping_bounds (stmtblock_t * block, tree type, tree desc)
{
  int n;
  tree dim;
  tree offset;
  tree tmp;

  offset = gfc_index_zero_node;
  for (n = 0; n < GFC_TYPE_ARRAY_RANK (type); n++)
    {
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      dim = gfc_rank_cst[n];
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      GFC_TYPE_ARRAY_STRIDE (type, n) = gfc_conv_array_stride (desc, n);
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      if (GFC_TYPE_ARRAY_LBOUND (type, n) == NULL_TREE)
	{
	  GFC_TYPE_ARRAY_LBOUND (type, n)
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		= gfc_conv_descriptor_lbound_get (desc, dim);
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	  GFC_TYPE_ARRAY_UBOUND (type, n)
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		= gfc_conv_descriptor_ubound_get (desc, dim);
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	}
      else if (GFC_TYPE_ARRAY_UBOUND (type, n) == NULL_TREE)
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	{
	  tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type,
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			     gfc_conv_descriptor_ubound_get (desc, dim),
			     gfc_conv_descriptor_lbound_get (desc, dim));
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	  tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
			     GFC_TYPE_ARRAY_LBOUND (type, n),
			     tmp);
	  tmp = gfc_evaluate_now (tmp, block);
	  GFC_TYPE_ARRAY_UBOUND (type, n) = tmp;
	}
      tmp = fold_build2 (MULT_EXPR, gfc_array_index_type,
			 GFC_TYPE_ARRAY_LBOUND (type, n),
			 GFC_TYPE_ARRAY_STRIDE (type, n));
      offset = fold_build2 (MINUS_EXPR, gfc_array_index_type, offset, tmp);
    }
  offset = gfc_evaluate_now (offset, block);
  GFC_TYPE_ARRAY_OFFSET (type) = offset;
}


/* Extend MAPPING so that it maps dummy argument SYM to the value stored
   in SE.  The caller may still use se->expr and se->string_length after
   calling this function.  */

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void
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gfc_add_interface_mapping (gfc_interface_mapping * mapping,
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			   gfc_symbol * sym, gfc_se * se,
			   gfc_expr *expr)
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{
  gfc_interface_sym_mapping *sm;
  tree desc;
  tree tmp;
  tree value;
  gfc_symbol *new_sym;
  gfc_symtree *root;
  gfc_symtree *new_symtree;

  /* Create a new symbol to represent the actual argument.  */
  new_sym = gfc_new_symbol (sym->name, NULL);
  new_sym->ts = sym->ts;
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  new_sym->as = gfc_copy_array_spec (sym->as);
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  new_sym->attr.referenced = 1;
  new_sym->attr.dimension = sym->attr.dimension;
  new_sym->attr.pointer = sym->attr.pointer;
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  new_sym->attr.allocatable = sym->attr.allocatable;
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  new_sym->attr.flavor = sym->attr.flavor;
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  new_sym->attr.function = sym->attr.function;
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  /* Ensure that the interface is available and that
     descriptors are passed for array actual arguments.  */
  if (sym->attr.flavor == FL_PROCEDURE)
    {
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      new_sym->formal = expr->symtree->n.sym->formal;
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      new_sym->attr.always_explicit
	    = expr->symtree->n.sym->attr.always_explicit;
    }

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  /* Create a fake symtree for it.  */
  root = NULL;
  new_symtree = gfc_new_symtree (&root, sym->name);
  new_symtree->n.sym = new_sym;
  gcc_assert (new_symtree == root);

  /* Create a dummy->actual mapping.  */
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  sm = XCNEW (gfc_interface_sym_mapping);
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  sm->next = mapping->syms;
  sm->old = sym;
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  sm->new_sym = new_symtree;
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  sm->expr = gfc_copy_expr (expr);
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  mapping->syms = sm;

  /* Stabilize the argument's value.  */
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  if (!sym->attr.function && se)
    se->expr = gfc_evaluate_now (se->expr, &se->pre);
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  if (sym->ts.type == BT_CHARACTER)
    {
      /* Create a copy of the dummy argument's length.  */
      new_sym->ts.cl = gfc_get_interface_mapping_charlen (mapping, sym->ts.cl);
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      sm->expr->ts.cl = new_sym->ts.cl;
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      /* If the length is specified as "*", record the length that
	 the caller is passing.  We should use the callee's length
	 in all other cases.  */
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      if (!new_sym->ts.cl->length && se)
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	{
	  se->string_length = gfc_evaluate_now (se->string_length, &se->pre);
	  new_sym->ts.cl->backend_decl = se->string_length;
	}
    }

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  if (!se)
    return;

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  /* Use the passed value as-is if the argument is a function.  */
  if (sym->attr.flavor == FL_PROCEDURE)
    value = se->expr;

  /* If the argument is either a string or a pointer to a string,
     convert it to a boundless character type.  */
  else if (!sym->attr.dimension && sym->ts.type == BT_CHARACTER)
    {
      tmp = gfc_get_character_type_len (sym->ts.kind, NULL);
      tmp = build_pointer_type (tmp);
      if (sym->attr.pointer)
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        value = build_fold_indirect_ref (se->expr);
      else
        value = se->expr;
      value = fold_convert (tmp, value);
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    }

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  /* If the argument is a scalar, a pointer to an array or an allocatable,
     dereference it.  */
  else if (!sym->attr.dimension || sym->attr.pointer || sym->attr.allocatable)
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    value = build_fold_indirect_ref (se->expr);
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  /* For character(*), use the actual argument's descriptor.  */  
  else if (sym->ts.type == BT_CHARACTER && !new_sym->ts.cl->length)
    value = build_fold_indirect_ref (se->expr);
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  /* If the argument is an array descriptor, use it to determine
     information about the actual argument's shape.  */
  else if (POINTER_TYPE_P (TREE_TYPE (se->expr))
	   && GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (TREE_TYPE (se->expr))))
    {
      /* Get the actual argument's descriptor.  */
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      desc = build_fold_indirect_ref (se->expr);
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      /* Create the replacement variable.  */
      tmp = gfc_conv_descriptor_data_get (desc);
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      value = gfc_get_interface_mapping_array (&se->pre, sym,
					       PACKED_NO, tmp);
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      /* Use DESC to work out the upper bounds, strides and offset.  */
      gfc_set_interface_mapping_bounds (&se->pre, TREE_TYPE (value), desc);
    }
  else
    /* Otherwise we have a packed array.  */
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    value = gfc_get_interface_mapping_array (&se->pre, sym,
					     PACKED_FULL, se->expr);
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  new_sym->backend_decl = value;
}


/* Called once all dummy argument mappings have been added to MAPPING,
   but before the mapping is used to evaluate expressions.  Pre-evaluate
   the length of each argument, adding any initialization code to PRE and
   any finalization code to POST.  */

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void
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gfc_finish_interface_mapping (gfc_interface_mapping * mapping,
			      stmtblock_t * pre, stmtblock_t * post)
{
  gfc_interface_sym_mapping *sym;
  gfc_expr *expr;
  gfc_se se;

  for (sym = mapping->syms; sym; sym = sym->next)
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    if (sym->new_sym->n.sym->ts.type == BT_CHARACTER
	&& !sym->new_sym->n.sym->ts.cl->backend_decl)
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      {
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	expr = sym->new_sym->n.sym->ts.cl->length;
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	gfc_apply_interface_mapping_to_expr (mapping, expr);
	gfc_init_se (&se, NULL);
	gfc_conv_expr (&se, expr);
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	se.expr = fold_convert (gfc_charlen_type_node, se.expr);
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	se.expr = gfc_evaluate_now (se.expr, &se.pre);
	gfc_add_block_to_block (pre, &se.pre);
	gfc_add_block_to_block (post, &se.post);

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	sym->new_sym->n.sym->ts.cl->backend_decl = se.expr;
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      }
}


/* Like gfc_apply_interface_mapping_to_expr, but applied to
   constructor C.  */

static void
gfc_apply_interface_mapping_to_cons (gfc_interface_mapping * mapping,
				     gfc_constructor * c)
{
  for (; c; c = c->next)
    {
      gfc_apply_interface_mapping_to_expr (mapping, c->expr);
      if (c->iterator)
	{
	  gfc_apply_interface_mapping_to_expr (mapping, c->iterator->start);
	  gfc_apply_interface_mapping_to_expr (mapping, c->iterator->end);
	  gfc_apply_interface_mapping_to_expr (mapping, c->iterator->step);
	}
    }
}


/* Like gfc_apply_interface_mapping_to_expr, but applied to
   reference REF.  */

static void
gfc_apply_interface_mapping_to_ref (gfc_interface_mapping * mapping,
				    gfc_ref * ref)
{
  int n;

  for (; ref; ref = ref->next)
    switch (ref->type)
      {
      case REF_ARRAY:
	for (n = 0; n < ref->u.ar.dimen; n++)
	  {
	    gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.start[n]);
	    gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.end[n]);
	    gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.stride[n]);
	  }
	gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.offset);
	break;

      case REF_COMPONENT:
	break;

      case REF_SUBSTRING:
	gfc_apply_interface_mapping_to_expr (mapping, ref->u.ss.start);
	gfc_apply_interface_mapping_to_expr (mapping, ref->u.ss.end);
	break;
      }
}


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/* Convert intrinsic function calls into result expressions.  */
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static bool
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gfc_map_intrinsic_function (gfc_expr *expr, gfc_interface_mapping *mapping)
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{
  gfc_symbol *sym;
  gfc_expr *new_expr;
  gfc_expr *arg1;
  gfc_expr *arg2;
  int d, dup;

  arg1 = expr->value.function.actual->expr;
  if (expr->value.function.actual->next)
    arg2 = expr->value.function.actual->next->expr;
  else
    arg2 = NULL;

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  sym = arg1->symtree->n.sym;
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  if (sym->attr.dummy)
    return false;

  new_expr = NULL;

  switch (expr->value.function.isym->id)
    {
    case GFC_ISYM_LEN:
      /* TODO figure out why this condition is necessary.  */
      if (sym->attr.function
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	  && (arg1->ts.cl->length == NULL
	      || (arg1->ts.cl->length->expr_type != EXPR_CONSTANT
		  && arg1->ts.cl->length->expr_type != EXPR_VARIABLE)))
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	return false;

      new_expr = gfc_copy_expr (arg1->ts.cl->length);
      break;

    case GFC_ISYM_SIZE:
      if (!sym->as)
	return false;

      if (arg2 && arg2->expr_type == EXPR_CONSTANT)
	{
	  dup = mpz_get_si (arg2->value.integer);
	  d = dup - 1;
	}
      else
	{
	  dup = sym->as->rank;
	  d = 0;
	}

      for (; d < dup; d++)
	{
	  gfc_expr *tmp;
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	  if (!sym->as->upper[d] || !sym->as->lower[d])
	    {
	      gfc_free_expr (new_expr);
	      return false;
	    }

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	  tmp = gfc_add (gfc_copy_expr (sym->as->upper[d]), gfc_int_expr (1));
	  tmp = gfc_subtract (tmp, gfc_copy_expr (sym->as->lower[d]));
	  if (new_expr)
	    new_expr = gfc_multiply (new_expr, tmp);
	  else
	    new_expr = tmp;
	}
      break;

    case GFC_ISYM_LBOUND:
    case GFC_ISYM_UBOUND:
	/* TODO These implementations of lbound and ubound do not limit if
	   the size < 0, according to F95's 13.14.53 and 13.14.113.  */

      if (!sym->as)
	return false;

      if (arg2 && arg2->expr_type == EXPR_CONSTANT)
	d = mpz_get_si (arg2->value.integer) - 1;
      else
	/* TODO: If the need arises, this could produce an array of
	   ubound/lbounds.  */
	gcc_unreachable ();

      if (expr->value.function.isym->id == GFC_ISYM_LBOUND)
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	{
	  if (sym->as->lower[d])
	    new_expr = gfc_copy_expr (sym->as->lower[d]);
	}
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      else
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	{
	  if (sym->as->upper[d])
	    new_expr = gfc_copy_expr (sym->as->upper[d]);
	}
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      break;

    default:
      break;
    }

  gfc_apply_interface_mapping_to_expr (mapping, new_expr);
  if (!new_expr)
    return false;

  gfc_replace_expr (expr, new_expr);
  return true;
}


static void
gfc_map_fcn_formal_to_actual (gfc_expr *expr, gfc_expr *map_expr,
			      gfc_interface_mapping * mapping)
{
  gfc_formal_arglist *f;
  gfc_actual_arglist *actual;

  actual = expr->value.function.actual;
  f = map_expr->symtree->n.sym->formal;

  for (; f && actual; f = f->next, actual = actual->next)
    {
      if (!actual->expr)
	continue;

      gfc_add_interface_mapping (mapping, f->sym, NULL, actual->expr);
    }

  if (map_expr->symtree->n.sym->attr.dimension)
    {
      int d;
      gfc_array_spec *as;

      as = gfc_copy_array_spec (map_expr->symtree->n.sym->as);

      for (d = 0; d < as->rank; d++)
	{
	  gfc_apply_interface_mapping_to_expr (mapping, as->lower[d]);
	  gfc_apply_interface_mapping_to_expr (mapping, as->upper[d]);
	}

      expr->value.function.esym->as = as;
    }

  if (map_expr->symtree->n.sym->ts.type == BT_CHARACTER)
    {
      expr->value.function.esym->ts.cl->length
	= gfc_copy_expr (map_expr->symtree->n.sym->ts.cl->length);

      gfc_apply_interface_mapping_to_expr (mapping,
			expr->value.function.esym->ts.cl->length);
    }
}


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/* EXPR is a copy of an expression that appeared in the interface
   associated with MAPPING.  Walk it recursively looking for references to
   dummy arguments that MAPPING maps to actual arguments.  Replace each such
   reference with a reference to the associated actual argument.  */

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static void
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gfc_apply_interface_mapping_to_expr (gfc_interface_mapping * mapping,
				     gfc_expr * expr)
{
  gfc_interface_sym_mapping *sym;
  gfc_actual_arglist *actual;

  if (!expr)
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    return;
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  /* Copying an expression does not copy its length, so do that here.  */
  if (expr->ts.type == BT_CHARACTER && expr->ts.cl)
    {
      expr->ts.cl = gfc_get_interface_mapping_charlen (mapping, expr->ts.cl);
      gfc_apply_interface_mapping_to_expr (mapping, expr->ts.cl->length);
    }

  /* Apply the mapping to any references.  */
  gfc_apply_interface_mapping_to_ref (mapping, expr->ref);

  /* ...and to the expression's symbol, if it has one.  */
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  /* TODO Find out why the condition on expr->symtree had to be moved into
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     the loop rather than being outside it, as originally.  */
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  for (sym = mapping->syms; sym; sym = sym->next)
    if (expr->symtree && sym->old == expr->symtree->n.sym)
      {
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	if (sym->new_sym->n.sym->backend_decl)
	  expr->symtree = sym->new_sym;
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	else if (sym->expr)
	  gfc_replace_expr (expr, gfc_copy_expr (sym->expr));
      }
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      /* ...and to subexpressions in expr->value.  */
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  switch (expr->expr_type)
    {
    case EXPR_VARIABLE:
    case EXPR_CONSTANT:
    case EXPR_NULL:
    case EXPR_SUBSTRING:
      break;

    case EXPR_OP:
      gfc_apply_interface_mapping_to_expr (mapping, expr->value.op.op1);
      gfc_apply_interface_mapping_to_expr (mapping, expr->value.op.op2);
      break;

    case EXPR_FUNCTION:
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      for (actual = expr->value.function.actual; actual; actual = actual->next)
	gfc_apply_interface_mapping_to_expr (mapping, actual->expr);

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      if (expr->value.function.esym == NULL
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	    && expr->value.function.isym != NULL
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	    && expr->value.function.actual->expr->symtree
	    && gfc_map_intrinsic_function (expr, mapping))
	break;
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      for (sym = mapping->syms; sym; sym = sym->next)
	if (sym->old == expr->value.function.esym)
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	  {
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	    expr->value.function.esym = sym->new_sym->n.sym;
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	    gfc_map_fcn_formal_to_actual (expr, sym->expr, mapping);
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	    expr->value.function.esym->result = sym->new_sym->n.sym;
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	  }
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      break;

    case EXPR_ARRAY:
    case EXPR_STRUCTURE:
      gfc_apply_interface_mapping_to_cons (mapping, expr->value.constructor);
      break;
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    case EXPR_COMPCALL:
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    case EXPR_PPC:
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      gcc_unreachable ();
      break;
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    }
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  return;
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}


/* Evaluate interface expression EXPR using MAPPING.  Store the result
   in SE.  */

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void
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gfc_apply_interface_mapping (gfc_interface_mapping * mapping,
			     gfc_se * se, gfc_expr * expr)
{
  expr = gfc_copy_expr (expr);
  gfc_apply_interface_mapping_to_expr (mapping, expr);
  gfc_conv_expr (se, expr);
  se->expr = gfc_evaluate_now (se->expr, &se->pre);
  gfc_free_expr (expr);
}

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/* Returns a reference to a temporary array into which a component of
   an actual argument derived type array is copied and then returned
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   after the function call.  */
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void
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gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
			   int g77, sym_intent intent)
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{
  gfc_se lse;
  gfc_se rse;
  gfc_ss *lss;
  gfc_ss *rss;
  gfc_loopinfo loop;
  gfc_loopinfo loop2;
  gfc_ss_info *info;
  tree offset;
  tree tmp_index;
  tree tmp;
  tree base_type;
  stmtblock_t body;
  int n;

  gcc_assert (expr->expr_type == EXPR_VARIABLE);

  gfc_init_se (&lse, NULL);
  gfc_init_se (&rse, NULL);

  /* Walk the argument expression.  */
  rss = gfc_walk_expr (expr);

  gcc_assert (rss != gfc_ss_terminator);
 
  /* Initialize the scalarizer.  */
  gfc_init_loopinfo (&loop);
  gfc_add_ss_to_loop (&loop, rss);

  /* Calculate the bounds of the scalarization.  */
  gfc_conv_ss_startstride (&loop);

  /* Build an ss for the temporary.  */
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  if (expr->ts.type == BT_CHARACTER && !expr->ts.cl->backend_decl)
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    gfc_conv_string_length (expr->ts.cl, expr, &parmse->pre);
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  base_type = gfc_typenode_for_spec (&expr->ts);
  if (GFC_ARRAY_TYPE_P (base_type)
		|| GFC_DESCRIPTOR_TYPE_P (base_type))
    base_type = gfc_get_element_type (base_type);

  loop.temp_ss = gfc_get_ss ();;
  loop.temp_ss->type = GFC_SS_TEMP;
  loop.temp_ss->data.temp.type = base_type;

  if (expr->ts.type == BT_CHARACTER)
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    loop.temp_ss->string_length = expr->ts.cl->backend_decl;
  else
    loop.temp_ss->string_length = NULL;
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  parmse->string_length = loop.temp_ss->string_length;
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  loop.temp_ss->data.temp.dimen = loop.dimen;
  loop.temp_ss->next = gfc_ss_terminator;

  /* Associate the SS with the loop.  */
  gfc_add_ss_to_loop (&loop, loop.temp_ss);

  /* Setup the scalarizing loops.  */
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  gfc_conv_loop_setup (&loop, &expr->where);
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  /* Pass the temporary descriptor back to the caller.  */
  info = &loop.temp_ss->data.info;
  parmse->expr = info->descriptor;

  /* Setup the gfc_se structures.  */
  gfc_copy_loopinfo_to_se (&lse, &loop);
  gfc_copy_loopinfo_to_se (&rse, &loop);

  rse.ss = rss;
  lse.ss = loop.temp_ss;
  gfc_mark_ss_chain_used (rss, 1);
  gfc_mark_ss_chain_used (loop.temp_ss, 1);

  /* Start the scalarized loop body.  */
  gfc_start_scalarized_body (&loop, &body);

  /* Translate the expression.  */
  gfc_conv_expr (&rse, expr);

  gfc_conv_tmp_array_ref (&lse);
  gfc_advance_se_ss_chain (&lse);

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  if (intent != INTENT_OUT)
    {
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      tmp = gfc_trans_scalar_assign (&lse, &rse, expr->ts, true, false);
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      gfc_add_expr_to_block (&body, tmp);
      gcc_assert (rse.ss == gfc_ss_terminator);
      gfc_trans_scalarizing_loops (&loop, &body);
    }
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  else
    {
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      /* Make sure that the temporary declaration survives by merging
       all the loop declarations into the current context.  */
      for (n = 0; n < loop.dimen; n++)
	{
	  gfc_merge_block_scope (&body);
	  body = loop.code[loop.order[n]];
	}
      gfc_merge_block_scope (&body);
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    }
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  /* Add the post block after the second loop, so that any
     freeing of allocated memory is done at the right time.  */
  gfc_add_block_to_block (&parmse->pre, &loop.pre);

  /**********Copy the temporary back again.*********/

  gfc_init_se (&lse, NULL);
  gfc_init_se (&rse, NULL);

  /* Walk the argument expression.  */
  lss = gfc_walk_expr (expr);
  rse.ss = loop.temp_ss;
  lse.ss = lss;

  /* Initialize the scalarizer.  */
  gfc_init_loopinfo (&loop2);
  gfc_add_ss_to_loop (&loop2, lss);

  /* Calculate the bounds of the scalarization.  */
  gfc_conv_ss_startstride (&loop2);

  /* Setup the scalarizing loops.  */
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  gfc_conv_loop_setup (&loop2, &expr->where);
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  gfc_copy_loopinfo_to_se (&lse, &loop2);
  gfc_copy_loopinfo_to_se (&rse, &loop2);

  gfc_mark_ss_chain_used (lss, 1);
  gfc_mark_ss_chain_used (loop.temp_ss, 1);

  /* Declare the variable to hold the temporary offset and start the
     scalarized loop body.  */
  offset = gfc_create_var (gfc_array_index_type, NULL);
  gfc_start_scalarized_body (&loop2, &body);

  /* Build the offsets for the temporary from the loop variables.  The
     temporary array has lbounds of zero and strides of one in all
     dimensions, so this is very simple.  The offset is only computed
     outside the innermost loop, so the overall transfer could be
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     optimized further.  */
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  info = &rse.ss->data.info;

  tmp_index = gfc_index_zero_node;
  for (n = info->dimen - 1; n > 0; n--)
    {
      tree tmp_str;
      tmp = rse.loop->loopvar[n];
      tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type,
			 tmp, rse.loop->from[n]);
      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
			 tmp, tmp_index);

      tmp_str = fold_build2 (MINUS_EXPR, gfc_array_index_type,
			     rse.loop->to[n-1], rse.loop->from[n-1]);
      tmp_str = fold_build2 (PLUS_EXPR, gfc_array_index_type,
			     tmp_str, gfc_index_one_node);

      tmp_index = fold_build2 (MULT_EXPR, gfc_array_index_type,
			       tmp, tmp_str);
    }

  tmp_index = fold_build2 (MINUS_EXPR, gfc_array_index_type,
  			   tmp_index, rse.loop->from[0]);
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  gfc_add_modify (&rse.loop->code[0], offset, tmp_index);
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  tmp_index = fold_build2 (PLUS_EXPR, gfc_array_index_type,
			   rse.loop->loopvar[0], offset);

  /* Now use the offset for the reference.  */
  tmp = build_fold_indirect_ref (info->data);
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  rse.expr = gfc_build_array_ref (tmp, tmp_index, NULL);
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  if (expr->ts.type == BT_CHARACTER)
    rse.string_length = expr->ts.cl->backend_decl;

  gfc_conv_expr (&lse, expr);

  gcc_assert (lse.ss == gfc_ss_terminator);

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  tmp = gfc_trans_scalar_assign (&lse, &rse, expr->ts, false, false);
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  gfc_add_expr_to_block (&body, tmp);
  
  /* Generate the copying loops.  */
  gfc_trans_scalarizing_loops (&loop2, &body);

  /* Wrap the whole thing up by adding the second loop to the post-block
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     and following it by the post-block of the first loop.  In this way,
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     if the temporary needs freeing, it is done after use!  */
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  if (intent != INTENT_IN)
    {
      gfc_add_block_to_block (&parmse->post, &loop2.pre);
      gfc_add_block_to_block (&parmse->post, &loop2.post);
    }
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  gfc_add_block_to_block (&parmse->post, &loop.post);

  gfc_cleanup_loop (&loop);
  gfc_cleanup_loop (&loop2);

  /* Pass the string length to the argument expression.  */
  if (expr->ts.type == BT_CHARACTER)
    parmse->string_length = expr->ts.cl->backend_decl;

  /* We want either the address for the data or the address of the descriptor,
     depending on the mode of passing array arguments.  */
  if (g77)
    parmse->expr = gfc_conv_descriptor_data_get (parmse->expr);
  else
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    parmse->expr = gfc_build_addr_expr (NULL_TREE, parmse->expr);
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  return;
}

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/* Generate the code for argument list functions.  */

static void
conv_arglist_function (gfc_se *se, gfc_expr *expr, const char *name)
{
  /* Pass by value for g77 %VAL(arg), pass the address
     indirectly for %LOC, else by reference.  Thus %REF
     is a "do-nothing" and %LOC is the same as an F95
     pointer.  */
  if (strncmp (name, "%VAL", 4) == 0)
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    gfc_conv_expr (se, expr);
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  else if (strncmp (name, "%LOC", 4) == 0)
    {
      gfc_conv_expr_reference (se, expr);
      se->expr = gfc_build_addr_expr (NULL, se->expr);
    }
  else if (strncmp (name, "%REF", 4) == 0)
    gfc_conv_expr_reference (se, expr);
  else
    gfc_error ("Unknown argument list function at %L", &expr->where);
}


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/* Generate code for a procedure call.  Note can return se->post != NULL.
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   If se->direct_byref is set then se->expr contains the return parameter.
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   Return nonzero, if the call has alternate specifiers.
   'expr' is only needed for procedure pointer components.  */
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int
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gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
			 gfc_actual_arglist * arg, gfc_expr * expr,
			 tree append_args)
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{
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  gfc_interface_mapping mapping;
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  tree arglist;
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  tree retargs;
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  tree tmp;
  tree fntype;
  gfc_se parmse;
  gfc_ss *argss;
  gfc_ss_info *info;
  int byref;
2384
  int parm_kind;
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  tree type;
  tree var;
  tree len;
  tree stringargs;
  gfc_formal_arglist *formal;
2390
  int has_alternate_specifier = 0;
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  bool need_interface_mapping;
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  bool callee_alloc;
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  gfc_typespec ts;
  gfc_charlen cl;
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  gfc_expr *e;
  gfc_symbol *fsym;
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  stmtblock_t post;
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  enum {MISSING = 0, ELEMENTAL, SCALAR, SCALAR_POINTER, ARRAY};
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  gfc_component *comp = NULL;
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  arglist = NULL_TREE;
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  retargs = NULL_TREE;
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  stringargs = NULL_TREE;
  var = NULL_TREE;
  len = NULL_TREE;
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  gfc_clear_ts (&ts);
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2407

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  if (sym->from_intmod == INTMOD_ISO_C_BINDING)
2409
    {
2410
      if (sym->intmod_sym_id == ISOCBINDING_LOC)
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	{
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	  if (arg->expr->rank == 0)
	    gfc_conv_expr_reference (se, arg->expr);
	  else
	    {
	      int f;
	      /* This is really the actual arg because no formal arglist is
		 created for C_LOC.	 */
	      fsym = arg->expr->symtree->n.sym;

	      /* We should want it to do g77 calling convention.  */
	      f = (fsym != NULL)
		&& !(fsym->attr.pointer || fsym->attr.allocatable)
		&& fsym->as->type != AS_ASSUMED_SHAPE;
	      f = f || !sym->attr.always_explicit;
	  
	      argss = gfc_walk_expr (arg->expr);
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	      gfc_conv_array_parameter (se, arg->expr, argss, f,
					NULL, NULL, NULL);
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	    }

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	  /* TODO -- the following two lines shouldn't be necessary, but
	    they're removed a bug is exposed later in the codepath.
	    This is workaround was thus introduced, but will have to be
	    removed; please see PR 35150 for details about the issue.  */
	  se->expr = convert (pvoid_type_node, se->expr);
	  se->expr = gfc_evaluate_now (se->expr, &se->pre);

2439
	  return 0;
2440
	}
2441
      else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2442
	{
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	  arg->expr->ts.type = sym->ts.derived->ts.type;
	  arg->expr->ts.f90_type = sym->ts.derived->ts.f90_type;
	  arg->expr->ts.kind = sym->ts.derived->ts.kind;
	  gfc_conv_expr_reference (se, arg->expr);
      
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	  return 0;
	}
      else if ((sym->intmod_sym_id == ISOCBINDING_F_POINTER
	         && arg->next->expr->rank == 0)
	       || sym->intmod_sym_id == ISOCBINDING_F_PROCPOINTER)
	{
	  /* Convert c_f_pointer if fptr is a scalar
	     and convert c_f_procpointer.  */
	  gfc_se cptrse;
	  gfc_se fptrse;

	  gfc_init_se (&cptrse, NULL);
	  gfc_conv_expr (&cptrse, arg->expr);
	  gfc_add_block_to_block (&se->pre, &cptrse.pre);
	  gfc_add_block_to_block (&se->post, &cptrse.post);

	  gfc_init_se (&fptrse, NULL);
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	  if (sym->intmod_sym_id == ISOCBINDING_F_POINTER
	      || is_proc_ptr_comp (arg->next->expr, NULL))
	    fptrse.want_pointer = 1;
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	  gfc_conv_expr (&fptrse, arg->next->expr);
	  gfc_add_block_to_block (&se->pre, &fptrse.pre);
	  gfc_add_block_to_block (&se->post, &fptrse.post);

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	  if (is_proc_ptr_comp (arg->next->expr, NULL))
	    tmp = gfc_get_ppc_type (arg->next->expr->ref->u.c.component);
	  else
	    tmp = TREE_TYPE (arg->next->expr->symtree->n.sym->backend_decl);
	  se->expr = fold_build2 (MODIFY_EXPR, tmp, fptrse.expr,
				  fold_convert (tmp, cptrse.expr));
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	  return 0;
	}
      else if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
        {
	  gfc_se arg1se;
	  gfc_se arg2se;

	  /* Build the addr_expr for the first argument.  The argument is
	     already an *address* so we don't need to set want_pointer in
	     the gfc_se.  */
	  gfc_init_se (&arg1se, NULL);
	  gfc_conv_expr (&arg1se, arg->expr);
	  gfc_add_block_to_block (&se->pre, &arg1se.pre);
	  gfc_add_block_to_block (&se->post, &arg1se.post);

	  /* See if we were given two arguments.  */
	  if (arg->next == NULL)
	    /* Only given one arg so generate a null and do a
	       not-equal comparison against the first arg.  */
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	    se->expr = fold_build2 (NE_EXPR, boolean_type_node, arg1se.expr,
				    fold_convert (TREE_TYPE (arg1se.expr),
						  null_pointer_node));
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	  else
	    {
	      tree eq_expr;
	      tree not_null_expr;
	      
	      /* Given two arguments so build the arg2se from second arg.  */
	      gfc_init_se (&arg2se, NULL);
	      gfc_conv_expr (&arg2se, arg->next->expr);
	      gfc_add_block_to_block (&se->pre, &arg2se.pre);
	      gfc_add_block_to_block (&se->post, &arg2se.post);

	      /* Generate test to compare that the two args are equal.  */
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	      eq_expr = fold_build2 (EQ_EXPR, boolean_type_node,
				     arg1se.expr, arg2se.expr);
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	      /* Generate test to ensure that the first arg is not null.  */
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	      not_null_expr = fold_build2 (NE_EXPR, boolean_type_node,
					   arg1se.expr, null_pointer_node);
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	      /* Finally, the generated test must check that both arg1 is not
		 NULL and that it is equal to the second arg.  */
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	      se->expr = fold_build2 (TRUTH_AND_EXPR, boolean_type_node,
				      not_null_expr, eq_expr);
2524 2525
	    }

2526
	  return 0;
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	}
    }
  
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  if (se->ss != NULL)
    {
      if (!sym->attr.elemental)
	{
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	  gcc_assert (se->ss->type == GFC_SS_FUNCTION);
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          if (se->ss->useflags)
            {
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              gcc_assert (gfc_return_by_reference (sym)
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                      && sym->result->attr.dimension);
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              gcc_assert (se->loop != NULL);
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              /* Access the previously obtained result.  */
              gfc_conv_tmp_array_ref (se);
              gfc_advance_se_ss_chain (se);
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              return 0;
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            }
	}
      info = &se->ss->data.info;
    }
  else
    info = NULL;

2552
  gfc_init_block (&post);
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  gfc_init_interface_mapping (&mapping);
2554
  is_proc_ptr_comp (expr, &comp);
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  need_interface_mapping = ((sym->ts.type == BT_CHARACTER
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				  && sym->ts.cl->length
				  && sym->ts.cl->length->expr_type
						!= EXPR_CONSTANT)
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			      || (comp && comp->attr.dimension)
			      || (!comp && sym->attr.dimension));
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  formal = sym->formal;
  /* Evaluate the arguments.  */
  for (; arg != NULL; arg = arg->next, formal = formal ? formal->next : NULL)
    {
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      e = arg->expr;
      fsym = formal ? formal->sym : NULL;
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      parm_kind = MISSING;
2568
      if (e == NULL)
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	{

	  if (se->ignore_optional)
	    {
	      /* Some intrinsics have already been resolved to the correct
	         parameters.  */
	      continue;
	    }
	  else if (arg->label)
	    {
              has_alternate_specifier = 1;
              continue;
	    }
	  else
	    {
	      /* Pass a NULL pointer for an absent arg.  */
	      gfc_init_se (&parmse, NULL);
	      parmse.expr = null_pointer_node;
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2587
              if (arg->missing_arg_type == BT_CHARACTER)
2588
		parmse.string_length = build_int_cst (gfc_charlen_type_node, 0);
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	    }
	}
      else if (se->ss && se->ss->useflags)
	{
	  /* An elemental function inside a scalarized loop.  */
          gfc_init_se (&parmse, se);
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          gfc_conv_expr_reference (&parmse, e);
2596
	  parm_kind = ELEMENTAL;
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	}
      else
	{
	  /* A scalar or transformational function.  */
	  gfc_init_se (&parmse, NULL);
2602
	  argss = gfc_walk_expr (e);
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	  if (argss == gfc_ss_terminator)
2605
            {
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	      if (e->expr_type == EXPR_VARIABLE
		    && e->symtree->n.sym->attr.cray_pointee
		    && fsym && fsym->attr.flavor == FL_PROCEDURE)
		{
		    /* The Cray pointer needs to be converted to a pointer to
		       a type given by the expression.  */
		    gfc_conv_expr (&parmse, e);
		    type = build_pointer_type (TREE_TYPE (parmse.expr));
		    tmp = gfc_get_symbol_decl (e->symtree->n.sym->cp_pointer);
		    parmse.expr = convert (type, tmp);
		}
 	      else if (fsym && fsym->attr.value)
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		{
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		  if (fsym->ts.type == BT_CHARACTER
		      && fsym->ts.is_c_interop
		      && fsym->ns->proc_name != NULL
		      && fsym->ns->proc_name->attr.is_bind_c)
		    {
		      parmse.expr = NULL;
		      gfc_conv_scalar_char_value (fsym, &parmse, &e);
		      if (parmse.expr == NULL)
			gfc_conv_expr (&parmse, e);
		    }
		  else
		    gfc_conv_expr (&parmse, e);
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		}
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	      else if (arg->name && arg->name[0] == '%')
		/* Argument list functions %VAL, %LOC and %REF are signalled
		   through arg->name.  */
		conv_arglist_function (&parmse, arg->expr, arg->name);
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	      else if ((e->expr_type == EXPR_FUNCTION)
			  && e->symtree->n.sym->attr.pointer
			  && fsym && fsym->attr.target)
		{
		  gfc_conv_expr (&parmse, e);
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		  parmse.expr = gfc_build_addr_expr (NULL_TREE, parmse.expr);
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		}
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	      else if (e->expr_type == EXPR_FUNCTION
		       && e->symtree->n.sym->result
		       && e->symtree->n.sym->result->attr.proc_pointer)
		{
		  /* Functions returning procedure pointers.  */
		  gfc_conv_expr (&parmse, e);
		  if (fsym && fsym->attr.proc_pointer)
		    parmse.expr = gfc_build_addr_expr (NULL_TREE, parmse.expr);
		}
2652 2653 2654
	      else
		{
		  gfc_conv_expr_reference (&parmse, e);
2655 2656 2657
		  if (fsym && e->expr_type != EXPR_NULL
		      && ((fsym->attr.pointer
			   && fsym->attr.flavor != FL_PROCEDURE)
2658 2659 2660
			  || (fsym->attr.proc_pointer
			      && !(e->expr_type == EXPR_VARIABLE
			      && e->symtree->n.sym->attr.dummy))))
2661 2662 2663 2664 2665
		    {
		      /* Scalar pointer dummy args require an extra level of
			 indirection. The null pointer already contains
			 this level of indirection.  */
		      parm_kind = SCALAR_POINTER;
2666
		      parmse.expr = gfc_build_addr_expr (NULL_TREE, parmse.expr);
2667 2668 2669
		    }
		}
	    }
dnovillo's avatar
 
dnovillo committed
2670 2671
	  else
	    {
eedelman's avatar
eedelman committed
2672 2673 2674 2675 2676 2677
              /* If the procedure requires an explicit interface, the actual
                 argument is passed according to the corresponding formal
                 argument.  If the corresponding formal argument is a POINTER,
                 ALLOCATABLE or assumed shape, we do not use g77's calling
                 convention, and pass the address of the array descriptor
                 instead. Otherwise we use g77's calling convention.  */
dnovillo's avatar
 
dnovillo committed
2678
	      int f;
2679 2680 2681
	      f = (fsym != NULL)
		  && !(fsym->attr.pointer || fsym->attr.allocatable)
		  && fsym->as->type != AS_ASSUMED_SHAPE;
dnovillo's avatar
 
dnovillo committed
2682
	      f = f || !sym->attr.always_explicit;
2683

2684
	      if (e->expr_type == EXPR_VARIABLE
2685
		    && is_subref_array (e))
2686 2687 2688 2689
		/* The actual argument is a component reference to an
		   array of derived types.  In this case, the argument
		   is converted to a temporary, which is passed and then
		   written back after the procedure call.  */
2690
		gfc_conv_subref_array_arg (&parmse, e, f,
2691
			fsym ? fsym->attr.intent : INTENT_INOUT);
2692
	      else
2693
	        gfc_conv_array_parameter (&parmse, e, argss, f, fsym,
jakub's avatar
jakub committed
2694
					  sym->name, NULL);
eedelman's avatar
eedelman committed
2695 2696 2697

              /* If an ALLOCATABLE dummy argument has INTENT(OUT) and is 
                 allocated on entry, it must be deallocated.  */
2698 2699
              if (fsym && fsym->attr.allocatable
                  && fsym->attr.intent == INTENT_OUT)
eedelman's avatar
eedelman committed
2700
                {
2701
                  tmp = build_fold_indirect_ref (parmse.expr);
2702
                  tmp = gfc_trans_dealloc_allocated (tmp);
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2703 2704 2705
                  gfc_add_expr_to_block (&se->pre, tmp);
                }

dnovillo's avatar
 
dnovillo committed
2706 2707 2708
	    } 
	}

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fxcoudert committed
2709 2710 2711 2712 2713 2714
      /* The case with fsym->attr.optional is that of a user subroutine
	 with an interface indicating an optional argument.  When we call
	 an intrinsic subroutine, however, fsym is NULL, but we might still
	 have an optional argument, so we proceed to the substitution
	 just in case.  */
      if (e && (fsym == NULL || fsym->attr.optional))
2715
	{
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fxcoudert committed
2716 2717 2718 2719
	  /* If an optional argument is itself an optional dummy argument,
	     check its presence and substitute a null if absent.  */
	  if (e->expr_type == EXPR_VARIABLE
	      && e->symtree->n.sym->attr.optional)
2720 2721
	    gfc_conv_missing_dummy (&parmse, e, fsym ? fsym->ts : e->ts,
				    e->representation.length);
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fxcoudert committed
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731
	}

      if (fsym && e)
	{
	  /* Obtain the character length of an assumed character length
	     length procedure from the typespec.  */
	  if (fsym->ts.type == BT_CHARACTER
	      && parmse.string_length == NULL_TREE
	      && e->ts.type == BT_PROCEDURE
	      && e->symtree->n.sym->ts.type == BT_CHARACTER
2732 2733
	      && e->symtree->n.sym->ts.cl->length != NULL
	      && e->symtree->n.sym->ts.cl->length->expr_type == EXPR_CONSTANT)
2734
	    {
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fxcoudert committed
2735 2736
	      gfc_conv_const_charlen (e->symtree->n.sym->ts.cl);
	      parmse.string_length = e->symtree->n.sym->ts.cl->backend_decl;
2737 2738
	    }
	}
rsandifo's avatar
rsandifo committed
2739

2740
      if (fsym && need_interface_mapping && e)
2741
	gfc_add_interface_mapping (&mapping, fsym, &parmse, e);
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fxcoudert committed
2742

dnovillo's avatar
 
dnovillo committed
2743
      gfc_add_block_to_block (&se->pre, &parmse.pre);
2744
      gfc_add_block_to_block (&post, &parmse.post);
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dnovillo committed
2745

2746
      /* Allocated allocatable components of derived types must be
2747 2748
	 deallocated for non-variable scalars.  Non-variable arrays are
	 dealt with in trans-array.c(gfc_conv_array_parameter).  */
2749 2750
      if (e && e->ts.type == BT_DERIVED
	    && e->ts.derived->attr.alloc_comp
2751
	    && !(e->symtree && e->symtree->n.sym->attr.pointer)
2752
	    && (e->expr_type != EXPR_VARIABLE && !e->rank))
2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768
        {
	  int parm_rank;
	  tmp = build_fold_indirect_ref (parmse.expr);
	  parm_rank = e->rank;
	  switch (parm_kind)
	    {
	    case (ELEMENTAL):
	    case (SCALAR):
	      parm_rank = 0;
	      break;

	    case (SCALAR_POINTER):
              tmp = build_fold_indirect_ref (tmp);
	      break;
	    }

2769 2770 2771 2772 2773 2774 2775 2776 2777 2778
	  if (e->expr_type == EXPR_OP
		&& e->value.op.op == INTRINSIC_PARENTHESES
		&& e->value.op.op1->expr_type == EXPR_VARIABLE)
	    {
	      tree local_tmp;
	      local_tmp = gfc_evaluate_now (tmp, &se->pre);
	      local_tmp = gfc_copy_alloc_comp (e->ts.derived, local_tmp, tmp, parm_rank);
	      gfc_add_expr_to_block (&se->post, local_tmp);
	    }

2779
	  tmp = gfc_deallocate_alloc_comp (e->ts.derived, tmp, parm_rank);
2780

2781
	  gfc_add_expr_to_block (&se->post, tmp);
2782 2783
        }

2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
      /* Add argument checking of passing an unallocated/NULL actual to
         a nonallocatable/nonpointer dummy.  */

      if (gfc_option.rtcheck & GFC_RTCHECK_POINTER)
        {
	  gfc_symbol *sym;
	  char *msg;
	  tree cond;

	  if (e->expr_type == EXPR_VARIABLE)
	    sym = e->symtree->n.sym;
	  else if (e->expr_type == EXPR_FUNCTION)
	    sym = e->symtree->n.sym->result;
	  else
	    goto end_pointer_check;

	  if (sym->attr.allocatable
	      && (fsym == NULL || !fsym->attr.allocatable))
	    asprintf (&msg, "Allocatable actual argument '%s' is not "
		      "allocated", sym->name);
	  else if (sym->attr.pointer
	      && (fsym == NULL || !fsym->attr.pointer))
	    asprintf (&msg, "Pointer actual argument '%s' is not "
		      "associated", sym->name);
          else if (sym->attr.proc_pointer
	      && (fsym == NULL || !fsym->attr.proc_pointer))
	    asprintf (&msg, "Proc-pointer actual argument '%s' is not "
		      "associated", sym->name);
	  else
	    goto end_pointer_check;

	  cond  = fold_build2 (EQ_EXPR, boolean_type_node, parmse.expr,
			       fold_convert (TREE_TYPE (parmse.expr),
					     null_pointer_node));
 
	  gfc_trans_runtime_check (true, false, cond, &se->pre, &e->where,
				   msg);
	  gfc_free (msg);
        }
      end_pointer_check:


2826
      /* Character strings are passed as two parameters, a length and a
2827 2828
         pointer - except for Bind(c) which only passes the pointer.  */
      if (parmse.string_length != NULL_TREE && !sym->attr.is_bind_c)
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dnovillo committed
2829 2830 2831 2832
        stringargs = gfc_chainon_list (stringargs, parmse.string_length);

      arglist = gfc_chainon_list (arglist, parmse.expr);
    }
rsandifo's avatar
rsandifo committed
2833 2834 2835
  gfc_finish_interface_mapping (&mapping, &se->pre, &se->post);

  ts = sym->ts;
2836 2837 2838
  if (ts.type == BT_CHARACTER && sym->attr.is_bind_c)
    se->string_length = build_int_cst (gfc_charlen_type_node, 1);
  else if (ts.type == BT_CHARACTER)
rsandifo's avatar
rsandifo committed
2839
    {
2840 2841 2842 2843
      if (sym->ts.cl->length == NULL)
	{
	  /* Assumed character length results are not allowed by 5.1.1.5 of the
	     standard and are trapped in resolve.c; except in the case of SPREAD
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
	     (and other intrinsics?) and dummy functions.  In the case of SPREAD,
	     we take the character length of the first argument for the result.
	     For dummies, we have to look through the formal argument list for
	     this function and use the character length found there.*/
	  if (!sym->attr.dummy)
	    cl.backend_decl = TREE_VALUE (stringargs);
	  else
	    {
	      formal = sym->ns->proc_name->formal;
	      for (; formal; formal = formal->next)
		if (strcmp (formal->sym->name, sym->name) == 0)
		  cl.backend_decl = formal->sym->ts.cl->backend_decl;
	    }
        }
        else
        {
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fxcoudert committed
2860 2861
	  tree tmp;

2862 2863 2864 2865 2866 2867 2868 2869
	  /* Calculate the length of the returned string.  */
	  gfc_init_se (&parmse, NULL);
	  if (need_interface_mapping)
	    gfc_apply_interface_mapping (&mapping, &parmse, sym->ts.cl->length);
	  else
	    gfc_conv_expr (&parmse, sym->ts.cl->length);
	  gfc_add_block_to_block (&se->pre, &parmse.pre);
	  gfc_add_block_to_block (&se->post, &parmse.post);
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fxcoudert committed
2870 2871 2872 2873 2874
	  
	  tmp = fold_convert (gfc_charlen_type_node, parmse.expr);
	  tmp = fold_build2 (MAX_EXPR, gfc_charlen_type_node, tmp,
			     build_int_cst (gfc_charlen_type_node, 0));
	  cl.backend_decl = tmp;
2875
	}
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rsandifo committed
2876 2877 2878 2879 2880 2881 2882 2883 2884

      /* Set up a charlen structure for it.  */
      cl.next = NULL;
      cl.length = NULL;
      ts.cl = &cl;

      len = cl.backend_decl;
    }

2885 2886
  byref = (comp && comp->attr.dimension)
	  || (!comp && gfc_return_by_reference (sym));
rsandifo's avatar
rsandifo committed
2887 2888 2889
  if (byref)
    {
      if (se->direct_byref)
2890
	{
rwild's avatar
rwild committed
2891
	  /* Sometimes, too much indirection can be applied; e.g. for
2892 2893 2894 2895 2896 2897 2898 2899 2900
	     function_result = array_valued_recursive_function.  */
	  if (TREE_TYPE (TREE_TYPE (se->expr))
		&& TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))
		&& GFC_DESCRIPTOR_TYPE_P
			(TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))))
	    se->expr = build_fold_indirect_ref (se->expr);

	  retargs = gfc_chainon_list (retargs, se->expr);
	}
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rsandifo committed
2901 2902 2903 2904 2905 2906 2907 2908
      else if (sym->result->attr.dimension)
	{
	  gcc_assert (se->loop && info);

	  /* Set the type of the array.  */
	  tmp = gfc_typenode_for_spec (&ts);
	  info->dimen = se->loop->dimen;

rsandifo's avatar
rsandifo committed
2909 2910 2911
	  /* Evaluate the bounds of the result, if known.  */
	  gfc_set_loop_bounds_from_array_spec (&mapping, se, sym->result->as);

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eedelman committed
2912 2913 2914 2915 2916
	  /* Create a temporary to store the result.  In case the function
	     returns a pointer, the temporary will be a shallow copy and
	     mustn't be deallocated.  */
	  callee_alloc = sym->attr.allocatable || sym->attr.pointer;
	  gfc_trans_create_temp_array (&se->pre, &se->post, se->loop, info, tmp,
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domob committed
2917 2918
				       NULL_TREE, false, !sym->attr.pointer,
				       callee_alloc, &se->ss->expr->where);
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rsandifo committed
2919 2920 2921

	  /* Pass the temporary as the first argument.  */
	  tmp = info->descriptor;
2922
	  tmp = gfc_build_addr_expr (NULL_TREE, tmp);
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2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
	  retargs = gfc_chainon_list (retargs, tmp);
	}
      else if (ts.type == BT_CHARACTER)
	{
	  /* Pass the string length.  */
	  type = gfc_get_character_type (ts.kind, ts.cl);
	  type = build_pointer_type (type);

	  /* Return an address to a char[0:len-1]* temporary for
	     character pointers.  */
	  if (sym->attr.pointer || sym->attr.allocatable)
	    {
2935
	      var = gfc_create_var (type, "pstr");
rsandifo's avatar
rsandifo committed
2936 2937

	      /* Provide an address expression for the function arguments.  */
2938
	      var = gfc_build_addr_expr (NULL_TREE, var);
rsandifo's avatar
rsandifo committed
2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949
	    }
	  else
	    var = gfc_conv_string_tmp (se, type, len);

	  retargs = gfc_chainon_list (retargs, var);
	}
      else
	{
	  gcc_assert (gfc_option.flag_f2c && ts.type == BT_COMPLEX);

	  type = gfc_get_complex_type (ts.kind);
2950
	  var = gfc_build_addr_expr (NULL_TREE, gfc_create_var (type, "cmplx"));
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rsandifo committed
2951 2952 2953 2954 2955 2956 2957
	  retargs = gfc_chainon_list (retargs, var);
	}

      /* Add the string length to the argument list.  */
      if (ts.type == BT_CHARACTER)
	retargs = gfc_chainon_list (retargs, len);
    }
rsandifo's avatar
rsandifo committed
2958
  gfc_free_interface_mapping (&mapping);
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rsandifo committed
2959 2960 2961

  /* Add the return arguments.  */
  arglist = chainon (retargs, arglist);
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dnovillo committed
2962 2963 2964 2965

  /* Add the hidden string length parameters to the arguments.  */
  arglist = chainon (arglist, stringargs);

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fxcoudert committed
2966 2967 2968 2969 2970
  /* We may want to append extra arguments here.  This is used e.g. for
     calls to libgfortran_matmul_??, which need extra information.  */
  if (append_args != NULL_TREE)
    arglist = chainon (arglist, append_args);

dnovillo's avatar
 
dnovillo committed
2971
  /* Generate the actual call.  */
2972
  conv_function_val (se, sym, expr);
2973

dnovillo's avatar
 
dnovillo committed
2974
  /* If there are alternate return labels, function type should be
2975
     integer.  Can't modify the type in place though, since it can be shared
2976 2977
     with other functions.  For dummy arguments, the typing is done to
     to this result, even if it has to be repeated for each call.  */
2978 2979 2980
  if (has_alternate_specifier
      && TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr))) != integer_type_node)
    {
2981 2982 2983 2984 2985
      if (!sym->attr.dummy)
	{
	  TREE_TYPE (sym->backend_decl)
		= build_function_type (integer_type_node,
		      TYPE_ARG_TYPES (TREE_TYPE (sym->backend_decl)));
2986
	  se->expr = gfc_build_addr_expr (NULL_TREE, sym->backend_decl);
2987 2988 2989
	}
      else
	TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr))) = integer_type_node;
2990
    }
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dnovillo committed
2991 2992

  fntype = TREE_TYPE (TREE_TYPE (se->expr));
2993
  se->expr = build_call_list (TREE_TYPE (fntype), se->expr, arglist);
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dnovillo committed
2994

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tobi committed
2995 2996 2997 2998
  /* If we have a pointer function, but we don't want a pointer, e.g.
     something like
        x = f()
     where f is pointer valued, we have to dereference the result.  */
2999 3000
  if (!se->want_pointer && !byref && sym->attr.pointer
      && !is_proc_ptr_comp (expr, NULL))
3001
    se->expr = build_fold_indirect_ref (se->expr);
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tobi committed
3002

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tobi committed
3003 3004 3005 3006 3007 3008 3009 3010 3011
  /* f2c calling conventions require a scalar default real function to
     return a double precision result.  Convert this back to default
     real.  We only care about the cases that can happen in Fortran 77.
  */
  if (gfc_option.flag_f2c && sym->ts.type == BT_REAL
      && sym->ts.kind == gfc_default_real_kind
      && !sym->attr.always_explicit)
    se->expr = fold_convert (gfc_get_real_type (sym->ts.kind), se->expr);

3012 3013
  /* A pure function may still have side-effects - it may modify its
     parameters.  */
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dnovillo committed
3014 3015 3016 3017 3018 3019
  TREE_SIDE_EFFECTS (se->expr) = 1;
#if 0
  if (!sym->attr.pure)
    TREE_SIDE_EFFECTS (se->expr) = 1;
#endif

3020
  if (byref)
dnovillo's avatar
 
dnovillo committed
3021
    {
3022
      /* Add the function call to the pre chain.  There is no expression.  */
dnovillo's avatar
 
dnovillo committed
3023
      gfc_add_expr_to_block (&se->pre, se->expr);
3024
      se->expr = NULL_TREE;
dnovillo's avatar
 
dnovillo committed
3025

3026
      if (!se->direct_byref)
dnovillo's avatar
 
dnovillo committed
3027
	{
tobi's avatar
tobi committed
3028
	  if (sym->attr.dimension)
dnovillo's avatar
 
dnovillo committed
3029
	    {
3030
	      if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS)
3031 3032 3033
		{
		  /* Check the data pointer hasn't been modified.  This would
		     happen in a function returning a pointer.  */
3034
		  tmp = gfc_conv_descriptor_data_get (info->descriptor);
3035 3036
		  tmp = fold_build2 (NE_EXPR, boolean_type_node,
				     tmp, info->data);
3037 3038
		  gfc_trans_runtime_check (true, false, tmp, &se->pre, NULL,
					   gfc_msg_fault);
3039 3040
		}
	      se->expr = info->descriptor;
3041 3042
	      /* Bundle in the string length.  */
	      se->string_length = len;
dnovillo's avatar
 
dnovillo committed
3043
	    }
3044
	  else if (sym->ts.type == BT_CHARACTER)
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kazu committed
3045
	    {
3046 3047
	      /* Dereference for character pointer results.  */
	      if (sym->attr.pointer || sym->attr.allocatable)
3048
		se->expr = build_fold_indirect_ref (var);
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kazu committed
3049
	      else
3050 3051
	        se->expr = var;

3052 3053 3054
	      se->string_length = len;
	    }
	  else
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tobi committed
3055 3056
	    {
	      gcc_assert (sym->ts.type == BT_COMPLEX && gfc_option.flag_f2c);
3057
	      se->expr = build_fold_indirect_ref (var);
tobi's avatar
tobi committed
3058
	    }
dnovillo's avatar
 
dnovillo committed
3059 3060
	}
    }
3061

3062 3063 3064 3065 3066 3067
  /* Follow the function call with the argument post block.  */
  if (byref)
    gfc_add_block_to_block (&se->pre, &post);
  else
    gfc_add_block_to_block (&se->post, &post);

3068
  return has_alternate_specifier;
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dnovillo committed
3069 3070 3071
}


3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094
/* Fill a character string with spaces.  */

static tree
fill_with_spaces (tree start, tree type, tree size)
{
  stmtblock_t block, loop;
  tree i, el, exit_label, cond, tmp;

  /* For a simple char type, we can call memset().  */
  if (compare_tree_int (TYPE_SIZE_UNIT (type), 1) == 0)
    return build_call_expr (built_in_decls[BUILT_IN_MEMSET], 3, start,
			    build_int_cst (gfc_get_int_type (gfc_c_int_kind),
					   lang_hooks.to_target_charset (' ')),
			    size);

  /* Otherwise, we use a loop:
	for (el = start, i = size; i > 0; el--, i+= TYPE_SIZE_UNIT (type))
	  *el = (type) ' ';
   */

  /* Initialize variables.  */
  gfc_init_block (&block);
  i = gfc_create_var (sizetype, "i");
3095
  gfc_add_modify (&block, i, fold_convert (sizetype, size));
3096
  el = gfc_create_var (build_pointer_type (type), "el");
3097
  gfc_add_modify (&block, el, fold_convert (TREE_TYPE (el), start));
3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108
  exit_label = gfc_build_label_decl (NULL_TREE);
  TREE_USED (exit_label) = 1;


  /* Loop body.  */
  gfc_init_block (&loop);

  /* Exit condition.  */
  cond = fold_build2 (LE_EXPR, boolean_type_node, i,
		      fold_convert (sizetype, integer_zero_node));
  tmp = build1_v (GOTO_EXPR, exit_label);
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aldyh committed
3109 3110
  tmp = fold_build3 (COND_EXPR, void_type_node, cond, tmp,
		     build_empty_stmt (input_location));
3111 3112 3113
  gfc_add_expr_to_block (&loop, tmp);

  /* Assignment.  */
3114
  gfc_add_modify (&loop, fold_build1 (INDIRECT_REF, type, el),
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		       build_int_cst (type,
				      lang_hooks.to_target_charset (' ')));

  /* Increment loop variables.  */
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  gfc_add_modify (&loop, i, fold_build2 (MINUS_EXPR, sizetype, i,
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					      TYPE_SIZE_UNIT (type)));
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  gfc_add_modify (&loop, el, fold_build2 (POINTER_PLUS_EXPR,
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					       TREE_TYPE (el), el,
					       TYPE_SIZE_UNIT (type)));

  /* Making the loop... actually loop!  */
  tmp = gfc_finish_block (&loop);
  tmp = build1_v (LOOP_EXPR, tmp);
  gfc_add_expr_to_block (&block, tmp);

  /* The exit label.  */
  tmp = build1_v (LABEL_EXPR, exit_label);
  gfc_add_expr_to_block (&block, tmp);


  return gfc_finish_block (&block);
}


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/* Generate code to copy a string.  */

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void
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gfc_trans_string_copy (stmtblock_t * block, tree dlength, tree dest,
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		       int dkind, tree slength, tree src, int skind)
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{
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  tree tmp, dlen, slen;
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  tree dsc;
  tree ssc;
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  tree cond;
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  tree cond2;
  tree tmp2;
  tree tmp3;
  tree tmp4;
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  tree chartype;
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  stmtblock_t tempblock;
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  gcc_assert (dkind == skind);

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  if (slength != NULL_TREE)
    {
      slen = fold_convert (size_type_node, gfc_evaluate_now (slength, block));
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      ssc = string_to_single_character (slen, src, skind);
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    }
  else
    {
      slen = build_int_cst (size_type_node, 1);
      ssc =  src;
    }

  if (dlength != NULL_TREE)
    {
      dlen = fold_convert (size_type_node, gfc_evaluate_now (dlength, block));
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      dsc = string_to_single_character (slen, dest, dkind);
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    }
  else
    {
      dlen = build_int_cst (size_type_node, 1);
      dsc =  dest;
    }

  if (slength != NULL_TREE && POINTER_TYPE_P (TREE_TYPE (src)))
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    ssc = string_to_single_character (slen, src, skind);
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  if (dlength != NULL_TREE && POINTER_TYPE_P (TREE_TYPE (dest)))
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    dsc = string_to_single_character (dlen, dest, dkind);
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  /* Assign directly if the types are compatible.  */
  if (dsc != NULL_TREE && ssc != NULL_TREE
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      && TREE_TYPE (dsc) == TREE_TYPE (ssc))
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    {
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      gfc_add_modify (block, dsc, ssc);
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      return;
    }
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  /* Do nothing if the destination length is zero.  */
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  cond = fold_build2 (GT_EXPR, boolean_type_node, dlen,
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		      build_int_cst (size_type_node, 0));
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  /* The following code was previously in _gfortran_copy_string:

       // The two strings may overlap so we use memmove.
       void
       copy_string (GFC_INTEGER_4 destlen, char * dest,
                    GFC_INTEGER_4 srclen, const char * src)
       {
         if (srclen >= destlen)
           {
             // This will truncate if too long.
             memmove (dest, src, destlen);
           }
         else
           {
             memmove (dest, src, srclen);
             // Pad with spaces.
             memset (&dest[srclen], ' ', destlen - srclen);
           }
       }

     We're now doing it here for better optimization, but the logic
     is the same.  */
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  /* For non-default character kinds, we have to multiply the string
     length by the base type size.  */
  chartype = gfc_get_char_type (dkind);
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  slen = fold_build2 (MULT_EXPR, size_type_node,
		      fold_convert (size_type_node, slen),
		      fold_convert (size_type_node, TYPE_SIZE_UNIT (chartype)));
  dlen = fold_build2 (MULT_EXPR, size_type_node,
		      fold_convert (size_type_node, dlen),
		      fold_convert (size_type_node, TYPE_SIZE_UNIT (chartype)));
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  if (dlength)
    dest = fold_convert (pvoid_type_node, dest);
  else
    dest = gfc_build_addr_expr (pvoid_type_node, dest);

  if (slength)
    src = fold_convert (pvoid_type_node, src);
  else
    src = gfc_build_addr_expr (pvoid_type_node, src);
3240

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  /* Truncate string if source is too long.  */
  cond2 = fold_build2 (GE_EXPR, boolean_type_node, slen, dlen);
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  tmp2 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
			  3, dest, src, dlen);
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  /* Else copy and pad with spaces.  */
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  tmp3 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
			  3, dest, src, slen);
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  tmp4 = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (dest), dest,
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		      fold_convert (sizetype, slen));
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  tmp4 = fill_with_spaces (tmp4, chartype,
			   fold_build2 (MINUS_EXPR, TREE_TYPE(dlen),
					dlen, slen));
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  gfc_init_block (&tempblock);
  gfc_add_expr_to_block (&tempblock, tmp3);
  gfc_add_expr_to_block (&tempblock, tmp4);
  tmp3 = gfc_finish_block (&tempblock);

  /* The whole copy_string function is there.  */
  tmp = fold_build3 (COND_EXPR, void_type_node, cond2, tmp2, tmp3);
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  tmp = fold_build3 (COND_EXPR, void_type_node, cond, tmp,
		     build_empty_stmt (input_location));
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  gfc_add_expr_to_block (block, tmp);
}


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/* Translate a statement function.
   The value of a statement function reference is obtained by evaluating the
   expression using the values of the actual arguments for the values of the
   corresponding dummy arguments.  */

static void
gfc_conv_statement_function (gfc_se * se, gfc_expr * expr)
{
  gfc_symbol *sym;
  gfc_symbol *fsym;
  gfc_formal_arglist *fargs;
  gfc_actual_arglist *args;
  gfc_se lse;
  gfc_se rse;
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  gfc_saved_var *saved_vars;
  tree *temp_vars;
  tree type;
  tree tmp;
  int n;
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  sym = expr->symtree->n.sym;
  args = expr->value.function.actual;
  gfc_init_se (&lse, NULL);
  gfc_init_se (&rse, NULL);

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  n = 0;
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  for (fargs = sym->formal; fargs; fargs = fargs->next)
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    n++;
  saved_vars = (gfc_saved_var *)gfc_getmem (n * sizeof (gfc_saved_var));
  temp_vars = (tree *)gfc_getmem (n * sizeof (tree));

  for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
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    {
      /* Each dummy shall be specified, explicitly or implicitly, to be
         scalar.  */
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      gcc_assert (fargs->sym->attr.dimension == 0);
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      fsym = fargs->sym;

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      /* Create a temporary to hold the value.  */
      type = gfc_typenode_for_spec (&fsym->ts);
      temp_vars[n] = gfc_create_var (type, fsym->name);

      if (fsym->ts.type == BT_CHARACTER)
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        {
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	  /* Copy string arguments.  */
          tree arglen;
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          gcc_assert (fsym->ts.cl && fsym->ts.cl->length
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		      && fsym->ts.cl->length->expr_type == EXPR_CONSTANT);
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          arglen = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
          tmp = gfc_build_addr_expr (build_pointer_type (type),
				     temp_vars[n]);
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          gfc_conv_expr (&rse, args->expr);
          gfc_conv_string_parameter (&rse);
          gfc_add_block_to_block (&se->pre, &lse.pre);
          gfc_add_block_to_block (&se->pre, &rse.pre);

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	  gfc_trans_string_copy (&se->pre, arglen, tmp, fsym->ts.kind,
				 rse.string_length, rse.expr, fsym->ts.kind);
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          gfc_add_block_to_block (&se->pre, &lse.post);
          gfc_add_block_to_block (&se->pre, &rse.post);
        }
      else
        {
          /* For everything else, just evaluate the expression.  */
          gfc_conv_expr (&lse, args->expr);

          gfc_add_block_to_block (&se->pre, &lse.pre);
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          gfc_add_modify (&se->pre, temp_vars[n], lse.expr);
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          gfc_add_block_to_block (&se->pre, &lse.post);
        }
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      args = args->next;
    }
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  /* Use the temporary variables in place of the real ones.  */
  for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
    gfc_shadow_sym (fargs->sym, temp_vars[n], &saved_vars[n]);

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  gfc_conv_expr (se, sym->value);
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  if (sym->ts.type == BT_CHARACTER)
    {
      gfc_conv_const_charlen (sym->ts.cl);

      /* Force the expression to the correct length.  */
      if (!INTEGER_CST_P (se->string_length)
	  || tree_int_cst_lt (se->string_length,
			      sym->ts.cl->backend_decl))
	{
	  type = gfc_get_character_type (sym->ts.kind, sym->ts.cl);
	  tmp = gfc_create_var (type, sym->name);
	  tmp = gfc_build_addr_expr (build_pointer_type (type), tmp);
	  gfc_trans_string_copy (&se->pre, sym->ts.cl->backend_decl, tmp,
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				 sym->ts.kind, se->string_length, se->expr,
				 sym->ts.kind);
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	  se->expr = tmp;
	}
      se->string_length = sym->ts.cl->backend_decl;
    }

3372
  /* Restore the original variables.  */
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  for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
    gfc_restore_sym (fargs->sym, &saved_vars[n]);
  gfc_free (saved_vars);
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}


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/* Return the backend_decl for a procedure pointer component.  */

tree
gfc_get_proc_ptr_comp (gfc_se *se, gfc_expr *e)
{
  gfc_se comp_se;
  gfc_init_se (&comp_se, NULL);
  e->expr_type = EXPR_VARIABLE;
  gfc_conv_expr (&comp_se, e);
  comp_se.expr = build_fold_addr_expr (comp_se.expr);
  return gfc_evaluate_now (comp_se.expr, &se->pre);  
}


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/* Translate a function expression.  */

static void
gfc_conv_function_expr (gfc_se * se, gfc_expr * expr)
{
  gfc_symbol *sym;

  if (expr->value.function.isym)
    {
      gfc_conv_intrinsic_function (se, expr);
      return;
    }

3406
  /* We distinguish statement functions from general functions to improve
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     runtime performance.  */
  if (expr->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
    {
      gfc_conv_statement_function (se, expr);
      return;
    }

  /* expr.value.function.esym is the resolved (specific) function symbol for
     most functions.  However this isn't set for dummy procedures.  */
  sym = expr->value.function.esym;
  if (!sym)
    sym = expr->symtree->n.sym;
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  gfc_conv_procedure_call (se, sym, expr->value.function.actual, expr,
			  NULL_TREE);
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}

3424

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static void
gfc_conv_array_constructor_expr (gfc_se * se, gfc_expr * expr)
{
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  gcc_assert (se->ss != NULL && se->ss != gfc_ss_terminator);
  gcc_assert (se->ss->expr == expr && se->ss->type == GFC_SS_CONSTRUCTOR);
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  gfc_conv_tmp_array_ref (se);
  gfc_advance_se_ss_chain (se);
}


3436
/* Build a static initializer.  EXPR is the expression for the initial value.
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   The other parameters describe the variable of the component being 
   initialized. EXPR may be null.  */
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tree
gfc_conv_initializer (gfc_expr * expr, gfc_typespec * ts, tree type,
		      bool array, bool pointer)
{
  gfc_se se;

  if (!(expr || pointer))
    return NULL_TREE;

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  /* Check if we have ISOCBINDING_NULL_PTR or ISOCBINDING_NULL_FUNPTR
     (these are the only two iso_c_binding derived types that can be
     used as initialization expressions).  If so, we need to modify
     the 'expr' to be that for a (void *).  */
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  if (expr != NULL && expr->ts.type == BT_DERIVED
      && expr->ts.is_iso_c && expr->ts.derived)
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    {
      gfc_symbol *derived = expr->ts.derived;

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      expr = gfc_int_expr (0);
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      /* The derived symbol has already been converted to a (void *).  Use
	 its kind.  */
      expr->ts.f90_type = derived->ts.f90_type;
      expr->ts.kind = derived->ts.kind;
    }
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  if (array)
    {
      /* Arrays need special handling.  */
      if (pointer)
	return gfc_build_null_descriptor (type);
      else
	return gfc_conv_array_initializer (type, expr);
    }
  else if (pointer)
    return fold_convert (type, null_pointer_node);
  else
    {
      switch (ts->type)
	{
	case BT_DERIVED:
	  gfc_init_se (&se, NULL);
	  gfc_conv_structure (&se, expr, 1);
	  return se.expr;

	case BT_CHARACTER:
	  return gfc_conv_string_init (ts->cl->backend_decl,expr);

	default:
	  gfc_init_se (&se, NULL);
	  gfc_conv_constant (&se, expr);
	  return se.expr;
	}
    }
}
  
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static tree
gfc_trans_subarray_assign (tree dest, gfc_component * cm, gfc_expr * expr)
{
  gfc_se rse;
  gfc_se lse;
  gfc_ss *rss;
  gfc_ss *lss;
  stmtblock_t body;
  stmtblock_t block;
  gfc_loopinfo loop;
  int n;
  tree tmp;

  gfc_start_block (&block);

  /* Initialize the scalarizer.  */
  gfc_init_loopinfo (&loop);

  gfc_init_se (&lse, NULL);
  gfc_init_se (&rse, NULL);

  /* Walk the rhs.  */
  rss = gfc_walk_expr (expr);
  if (rss == gfc_ss_terminator)
    {
      /* The rhs is scalar.  Add a ss for the expression.  */
      rss = gfc_get_ss ();
      rss->next = gfc_ss_terminator;
      rss->type = GFC_SS_SCALAR;
      rss->expr = expr;
    }

  /* Create a SS for the destination.  */
  lss = gfc_get_ss ();
  lss->type = GFC_SS_COMPONENT;
  lss->expr = NULL;
  lss->shape = gfc_get_shape (cm->as->rank);
  lss->next = gfc_ss_terminator;
  lss->data.info.dimen = cm->as->rank;
  lss->data.info.descriptor = dest;
  lss->data.info.data = gfc_conv_array_data (dest);
  lss->data.info.offset = gfc_conv_array_offset (dest);
  for (n = 0; n < cm->as->rank; n++)
    {
      lss->data.info.dim[n] = n;
      lss->data.info.start[n] = gfc_conv_array_lbound (dest, n);
      lss->data.info.stride[n] = gfc_index_one_node;

      mpz_init (lss->shape[n]);
      mpz_sub (lss->shape[n], cm->as->upper[n]->value.integer,
	       cm->as->lower[n]->value.integer);
      mpz_add_ui (lss->shape[n], lss->shape[n], 1);
    }
  
  /* Associate the SS with the loop.  */
  gfc_add_ss_to_loop (&loop, lss);
  gfc_add_ss_to_loop (&loop, rss);

  /* Calculate the bounds of the scalarization.  */
  gfc_conv_ss_startstride (&loop);

  /* Setup the scalarizing loops.  */
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  gfc_conv_loop_setup (&loop, &expr->where);
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  /* Setup the gfc_se structures.  */
  gfc_copy_loopinfo_to_se (&lse, &loop);
  gfc_copy_loopinfo_to_se (&rse, &loop);

  rse.ss = rss;
  gfc_mark_ss_chain_used (rss, 1);
  lse.ss = lss;
  gfc_mark_ss_chain_used (lss, 1);

  /* Start the scalarized loop body.  */
  gfc_start_scalarized_body (&loop, &body);

  gfc_conv_tmp_array_ref (&lse);
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  if (cm->ts.type == BT_CHARACTER)
    lse.string_length = cm->ts.cl->backend_decl;

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  gfc_conv_expr (&rse, expr);

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  tmp = gfc_trans_scalar_assign (&lse, &rse, cm->ts, true, false);
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  gfc_add_expr_to_block (&body, tmp);

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  gcc_assert (rse.ss == gfc_ss_terminator);
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  /* Generate the copying loops.  */
  gfc_trans_scalarizing_loops (&loop, &body);

  /* Wrap the whole thing up.  */
  gfc_add_block_to_block (&block, &loop.pre);
  gfc_add_block_to_block (&block, &loop.post);

  for (n = 0; n < cm->as->rank; n++)
    mpz_clear (lss->shape[n]);
  gfc_free (lss->shape);

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  gfc_cleanup_loop (&loop);

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  return gfc_finish_block (&block);
}

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/* Assign a single component of a derived type constructor.  */

static tree
gfc_trans_subcomponent_assign (tree dest, gfc_component * cm, gfc_expr * expr)
{
  gfc_se se;
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  gfc_se lse;
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  gfc_ss *rss;
  stmtblock_t block;
  tree tmp;
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  tree offset;
  int n;
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  gfc_start_block (&block);
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  if (cm->attr.pointer)
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    {
      gfc_init_se (&se, NULL);
      /* Pointer component.  */
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      if (cm->attr.dimension)
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	{
	  /* Array pointer.  */
	  if (expr->expr_type == EXPR_NULL)
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	    gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
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	  else
	    {
	      rss = gfc_walk_expr (expr);
	      se.direct_byref = 1;
	      se.expr = dest;
	      gfc_conv_expr_descriptor (&se, expr, rss);
	      gfc_add_block_to_block (&block, &se.pre);
	      gfc_add_block_to_block (&block, &se.post);
	    }
	}
      else
	{
	  /* Scalar pointers.  */
	  se.want_pointer = 1;
	  gfc_conv_expr (&se, expr);
	  gfc_add_block_to_block (&block, &se.pre);
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	  gfc_add_modify (&block, dest,
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			       fold_convert (TREE_TYPE (dest), se.expr));
	  gfc_add_block_to_block (&block, &se.post);
	}
    }
3645
  else if (cm->attr.dimension)
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    {
3647
      if (cm->attr.allocatable && expr->expr_type == EXPR_NULL)
3648
 	gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
3649
      else if (cm->attr.allocatable)
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	{
	  tree tmp2;
3652 3653 3654 3655

          gfc_init_se (&se, NULL);
 
	  rss = gfc_walk_expr (expr);
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	  se.want_pointer = 0;
	  gfc_conv_expr_descriptor (&se, expr, rss);
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	  gfc_add_block_to_block (&block, &se.pre);

	  tmp = fold_convert (TREE_TYPE (dest), se.expr);
3661
	  gfc_add_modify (&block, dest, tmp);
3662

3663
	  if (cm->ts.type == BT_DERIVED && cm->ts.derived->attr.alloc_comp)
3664 3665 3666
	    tmp = gfc_copy_alloc_comp (cm->ts.derived, se.expr, dest,
				       cm->as->rank);
	  else
3667
	    tmp = gfc_duplicate_allocatable (dest, se.expr,
3668 3669 3670
					     TREE_TYPE(cm->backend_decl),
					     cm->as->rank);

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	  gfc_add_expr_to_block (&block, tmp);
	  gfc_add_block_to_block (&block, &se.post);
3673 3674 3675

	  if (expr->expr_type != EXPR_VARIABLE)
	    gfc_conv_descriptor_data_set (&block, se.expr, null_pointer_node);
3676 3677 3678

	  /* Shift the lbound and ubound of temporaries to being unity, rather
	     than zero, based.  Calculate the offset for all cases.  */
3679
	  offset = gfc_conv_descriptor_offset_get (dest);
3680
	  gfc_add_modify (&block, offset, gfc_index_zero_node);
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	  tmp2 =gfc_create_var (gfc_array_index_type, NULL);
	  for (n = 0; n < expr->rank; n++)
	    {
	      if (expr->expr_type != EXPR_VARIABLE
		    && expr->expr_type != EXPR_CONSTANT)
		{
		  tree span;
3688
		  tmp = gfc_conv_descriptor_ubound_get (dest, gfc_rank_cst[n]);
3689
		  span = fold_build2 (MINUS_EXPR, gfc_array_index_type, tmp,
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			    gfc_conv_descriptor_lbound_get (dest, gfc_rank_cst[n]));
		  tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
				     span, gfc_index_one_node);
		  gfc_conv_descriptor_ubound_set (&block, dest, gfc_rank_cst[n],
						  tmp);
		  gfc_conv_descriptor_lbound_set (&block, dest, gfc_rank_cst[n],
						  gfc_index_one_node);
3697 3698
		}
	      tmp = fold_build2 (MULT_EXPR, gfc_array_index_type,
3699
				 gfc_conv_descriptor_lbound_get (dest,
3700
							     gfc_rank_cst[n]),
3701
				 gfc_conv_descriptor_stride_get (dest,
3702
							     gfc_rank_cst[n]));
3703
	      gfc_add_modify (&block, tmp2, tmp);
3704
	      tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type, offset, tmp2);
3705
	      gfc_conv_descriptor_offset_set (&block, dest, tmp);
3706
	    }
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	  if (expr->expr_type == EXPR_FUNCTION
		&& expr->value.function.isym
		&& expr->value.function.isym->conversion
		&& expr->value.function.actual->expr
		&& expr->value.function.actual->expr->expr_type
						== EXPR_VARIABLE)
	    {
	      /* If a conversion expression has a null data pointer
		 argument, nullify the allocatable component.  */
	      gfc_symbol *s;
	      tree non_null_expr;
	      tree null_expr;
	      s = expr->value.function.actual->expr->symtree->n.sym;
	      if (s->attr.allocatable || s->attr.pointer)
		{
		  non_null_expr = gfc_finish_block (&block);
		  gfc_start_block (&block);
		  gfc_conv_descriptor_data_set (&block, dest,
						null_pointer_node);
		  null_expr = gfc_finish_block (&block);
		  tmp = gfc_conv_descriptor_data_get (s->backend_decl);
		  tmp = build2 (EQ_EXPR, boolean_type_node, tmp,
			        fold_convert (TREE_TYPE (tmp),
					      null_pointer_node));
		  return build3_v (COND_EXPR, tmp, null_expr,
				   non_null_expr);
		}
	    }
3736
	}
3737
      else
3738
	{
3739 3740
	  tmp = gfc_trans_subarray_assign (dest, cm, expr);
	  gfc_add_expr_to_block (&block, tmp);
3741
	}
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    }
  else if (expr->ts.type == BT_DERIVED)
    {
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      if (expr->expr_type != EXPR_STRUCTURE)
	{
	  gfc_init_se (&se, NULL);
	  gfc_conv_expr (&se, expr);
3749
	  gfc_add_block_to_block (&block, &se.pre);
3750
	  gfc_add_modify (&block, dest,
3751
			       fold_convert (TREE_TYPE (dest), se.expr));
3752
	  gfc_add_block_to_block (&block, &se.post);
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	}
      else
	{
	  /* Nested constructors.  */
	  tmp = gfc_trans_structure_assign (dest, expr);
	  gfc_add_expr_to_block (&block, tmp);
	}
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    }
  else
    {
      /* Scalar component.  */
      gfc_init_se (&se, NULL);
      gfc_init_se (&lse, NULL);

      gfc_conv_expr (&se, expr);
      if (cm->ts.type == BT_CHARACTER)
	lse.string_length = cm->ts.cl->backend_decl;
      lse.expr = dest;
3771
      tmp = gfc_trans_scalar_assign (&lse, &se, cm->ts, true, false);
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      gfc_add_expr_to_block (&block, tmp);
    }
  return gfc_finish_block (&block);
}

3777
/* Assign a derived type constructor to a variable.  */
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static tree
gfc_trans_structure_assign (tree dest, gfc_expr * expr)
{
  gfc_constructor *c;
  gfc_component *cm;
  stmtblock_t block;
  tree field;
  tree tmp;

  gfc_start_block (&block);
  cm = expr->ts.derived->components;
  for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
    {
      /* Skip absent members in default initializers.  */
      if (!c->expr)
3794 3795
	continue;

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      field = cm->backend_decl;
3797 3798
      tmp = fold_build3 (COMPONENT_REF, TREE_TYPE (field),
			 dest, field, NULL_TREE);
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      tmp = gfc_trans_subcomponent_assign (tmp, cm, c->expr);
      gfc_add_expr_to_block (&block, tmp);
    }
  return gfc_finish_block (&block);
}

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/* Build an expression for a constructor. If init is nonzero then
   this is part of a static variable initializer.  */

void
gfc_conv_structure (gfc_se * se, gfc_expr * expr, int init)
{
  gfc_constructor *c;
  gfc_component *cm;
  tree val;
  tree type;
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  tree tmp;
3816
  VEC(constructor_elt,gc) *v = NULL;
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  gcc_assert (se->ss == NULL);
  gcc_assert (expr->expr_type == EXPR_STRUCTURE);
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  type = gfc_typenode_for_spec (&expr->ts);
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  if (!init)
    {
      /* Create a temporary variable and fill it in.  */
      se->expr = gfc_create_var (type, expr->ts.derived->name);
      tmp = gfc_trans_structure_assign (se->expr, expr);
      gfc_add_expr_to_block (&se->pre, tmp);
      return;
    }

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  cm = expr->ts.derived->components;
3832

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  for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
    {
3835 3836 3837 3838
      /* Skip absent members in default initializers and allocatable
	 components.  Although the latter have a default initializer
	 of EXPR_NULL,... by default, the static nullify is not needed
	 since this is done every time we come into scope.  */
3839
      if (!c->expr || cm->attr.allocatable)
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3840 3841
        continue;

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      val = gfc_conv_initializer (c->expr, &cm->ts,
3843 3844
	  TREE_TYPE (cm->backend_decl), cm->attr.dimension,
	  cm->attr.pointer || cm->attr.proc_pointer);
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3845

3846 3847
      /* Append it to the constructor list.  */
      CONSTRUCTOR_APPEND_ELT (v, cm->backend_decl, val);
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3848
    }
3849
  se->expr = build_constructor (type, v);
3850
  if (init) 
3851
    TREE_CONSTANT (se->expr) = 1;
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}


3855
/* Translate a substring expression.  */
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static void
gfc_conv_substring_expr (gfc_se * se, gfc_expr * expr)
{
  gfc_ref *ref;

  ref = expr->ref;

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  gcc_assert (ref == NULL || ref->type == REF_SUBSTRING);
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  se->expr = gfc_build_wide_string_const (expr->ts.kind,
					  expr->value.character.length,
					  expr->value.character.string);
3869

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3870
  se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));
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3871
  TYPE_STRING_FLAG (TREE_TYPE (se->expr)) = 1;
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dnovillo committed
3872

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3873 3874
  if (ref)
    gfc_conv_substring (se, ref, expr->ts.kind, NULL, &expr->where);
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}


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/* Entry point for expression translation.  Evaluates a scalar quantity.
   EXPR is the expression to be translated, and SE is the state structure if
   called from within the scalarized.  */
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void
gfc_conv_expr (gfc_se * se, gfc_expr * expr)
{
  if (se->ss && se->ss->expr == expr
      && (se->ss->type == GFC_SS_SCALAR || se->ss->type == GFC_SS_REFERENCE))
    {
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      /* Substitute a scalar expression evaluated outside the scalarization
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3889 3890
         loop.  */
      se->expr = se->ss->data.scalar.expr;
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      se->string_length = se->ss->string_length;
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      gfc_advance_se_ss_chain (se);
      return;
    }

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  /* We need to convert the expressions for the iso_c_binding derived types.
     C_NULL_PTR and C_NULL_FUNPTR will be made EXPR_NULL, which evaluates to
     null_pointer_node.  C_PTR and C_FUNPTR are converted to match the
     typespec for the C_PTR and C_FUNPTR symbols, which has already been
     updated to be an integer with a kind equal to the size of a (void *).  */
  if (expr->ts.type == BT_DERIVED && expr->ts.derived
      && expr->ts.derived->attr.is_iso_c)
    {
      if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
          || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
        {
	  /* Set expr_type to EXPR_NULL, which will result in
	     null_pointer_node being used below.  */
          expr->expr_type = EXPR_NULL;
        }
      else
        {
          /* Update the type/kind of the expression to be what the new
             type/kind are for the updated symbols of C_PTR/C_FUNPTR.  */
          expr->ts.type = expr->ts.derived->ts.type;
          expr->ts.f90_type = expr->ts.derived->ts.f90_type;
          expr->ts.kind = expr->ts.derived->ts.kind;
        }
    }
  
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  switch (expr->expr_type)
    {
    case EXPR_OP:
      gfc_conv_expr_op (se, expr);
      break;

    case EXPR_FUNCTION:
      gfc_conv_function_expr (se, expr);
      break;

    case EXPR_CONSTANT:
      gfc_conv_constant (se, expr);
      break;

    case EXPR_VARIABLE:
      gfc_conv_variable (se, expr);
      break;

    case EXPR_NULL:
      se->expr = null_pointer_node;
      break;

    case EXPR_SUBSTRING:
      gfc_conv_substring_expr (se, expr);
      break;

    case EXPR_STRUCTURE:
      gfc_conv_structure (se, expr, 0);
      break;

    case EXPR_ARRAY:
      gfc_conv_array_constructor_expr (se, expr);
      break;

    default:
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      gcc_unreachable ();
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      break;
    }
}

3961 3962
/* Like gfc_conv_expr_val, but the value is also suitable for use in the lhs
   of an assignment.  */
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void
gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr)
{
  gfc_conv_expr (se, expr);
3967
  /* All numeric lvalues should have empty post chains.  If not we need to
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dnovillo committed
3968
     figure out a way of rewriting an lvalue so that it has no post chain.  */
3969
  gcc_assert (expr->ts.type == BT_CHARACTER || !se->post.head);
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}

3972
/* Like gfc_conv_expr, but the POST block is guaranteed to be empty for
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   numeric expressions.  Used for scalar values where inserting cleanup code
3974
   is inconvenient.  */
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void
gfc_conv_expr_val (gfc_se * se, gfc_expr * expr)
{
  tree val;

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3980
  gcc_assert (expr->ts.type != BT_CHARACTER);
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  gfc_conv_expr (se, expr);
  if (se->post.head)
    {
      val = gfc_create_var (TREE_TYPE (se->expr), NULL);
3985
      gfc_add_modify (&se->pre, val, se->expr);
3986 3987
      se->expr = val;
      gfc_add_block_to_block (&se->pre, &se->post);
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    }
}

3991
/* Helper to translate an expression and convert it to a particular type.  */
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void
gfc_conv_expr_type (gfc_se * se, gfc_expr * expr, tree type)
{
  gfc_conv_expr_val (se, expr);
  se->expr = convert (type, se->expr);
}


4000
/* Converts an expression so that it can be passed by reference.  Scalar
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   values only.  */

void
gfc_conv_expr_reference (gfc_se * se, gfc_expr * expr)
{
  tree var;

  if (se->ss && se->ss->expr == expr
      && se->ss->type == GFC_SS_REFERENCE)
    {
      se->expr = se->ss->data.scalar.expr;
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      se->string_length = se->ss->string_length;
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      gfc_advance_se_ss_chain (se);
      return;
    }

  if (expr->ts.type == BT_CHARACTER)
    {
      gfc_conv_expr (se, expr);
      gfc_conv_string_parameter (se);
      return;
    }

  if (expr->expr_type == EXPR_VARIABLE)
    {
      se->want_pointer = 1;
      gfc_conv_expr (se, expr);
      if (se->post.head)
	{
	  var = gfc_create_var (TREE_TYPE (se->expr), NULL);
4031
	  gfc_add_modify (&se->pre, var, se->expr);
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	  gfc_add_block_to_block (&se->pre, &se->post);
	  se->expr = var;
	}
      return;
    }

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  if (expr->expr_type == EXPR_FUNCTION
	&& expr->symtree->n.sym->attr.pointer
	&& !expr->symtree->n.sym->attr.dimension)
    {
      se->want_pointer = 1;
      gfc_conv_expr (se, expr);
      var = gfc_create_var (TREE_TYPE (se->expr), NULL);
4045
      gfc_add_modify (&se->pre, var, se->expr);
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      se->expr = var;
      return;
    }


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  gfc_conv_expr (se, expr);

  /* Create a temporary var to hold the value.  */
4054 4055
  if (TREE_CONSTANT (se->expr))
    {
4056 4057
      tree tmp = se->expr;
      STRIP_TYPE_NOPS (tmp);
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      var = build_decl (input_location,
			CONST_DECL, NULL, TREE_TYPE (tmp));
4060
      DECL_INITIAL (var) = tmp;
4061
      TREE_STATIC (var) = 1;
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      pushdecl (var);
    }
  else
    {
      var = gfc_create_var (TREE_TYPE (se->expr), NULL);
4067
      gfc_add_modify (&se->pre, var, se->expr);
4068
    }
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  gfc_add_block_to_block (&se->pre, &se->post);

  /* Take the address of that value.  */
4072
  se->expr = gfc_build_addr_expr (NULL_TREE, var);
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}


tree
gfc_trans_pointer_assign (gfc_code * code)
{
4079
  return gfc_trans_pointer_assignment (code->expr1, code->expr2);
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}


4083 4084
/* Generate code for a pointer assignment.  */

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tree
gfc_trans_pointer_assignment (gfc_expr * expr1, gfc_expr * expr2)
{
  gfc_se lse;
  gfc_se rse;
  gfc_ss *lss;
  gfc_ss *rss;
  stmtblock_t block;
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  tree desc;
  tree tmp;
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  tree decl;

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  gfc_start_block (&block);

  gfc_init_se (&lse, NULL);

  lss = gfc_walk_expr (expr1);
  rss = gfc_walk_expr (expr2);
  if (lss == gfc_ss_terminator)
    {
4105
      /* Scalar pointers.  */
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      lse.want_pointer = 1;
      gfc_conv_expr (&lse, expr1);
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      gcc_assert (rss == gfc_ss_terminator);
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      gfc_init_se (&rse, NULL);
      rse.want_pointer = 1;
      gfc_conv_expr (&rse, expr2);
4112 4113 4114 4115 4116

      if (expr1->symtree->n.sym->attr.proc_pointer
	  && expr1->symtree->n.sym->attr.dummy)
	lse.expr = build_fold_indirect_ref (lse.expr);

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      if (expr2->symtree && expr2->symtree->n.sym->attr.proc_pointer
	  && expr2->symtree->n.sym->attr.dummy)
	rse.expr = build_fold_indirect_ref (rse.expr);

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      gfc_add_block_to_block (&block, &lse.pre);
      gfc_add_block_to_block (&block, &rse.pre);
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      /* Check character lengths if character expression.  The test is only
	 really added if -fbounds-check is enabled.  */
      if (expr1->ts.type == BT_CHARACTER && expr2->expr_type != EXPR_NULL)
	{
	  gcc_assert (expr2->ts.type == BT_CHARACTER);
	  gcc_assert (lse.string_length && rse.string_length);
	  gfc_trans_same_strlen_check ("pointer assignment", &expr1->where,
				       lse.string_length, rse.string_length,
				       &block);
	}

4135
      gfc_add_modify (&block, lse.expr,
4136
			   fold_convert (TREE_TYPE (lse.expr), rse.expr));
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      gfc_add_block_to_block (&block, &rse.post);
      gfc_add_block_to_block (&block, &lse.post);
    }
  else
    {
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      tree strlen_lhs;
      tree strlen_rhs = NULL_TREE;

4146
      /* Array pointer.  */
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      gfc_conv_expr_descriptor (&lse, expr1, lss);
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      strlen_lhs = lse.string_length;
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      switch (expr2->expr_type)
	{
	case EXPR_NULL:
	  /* Just set the data pointer to null.  */
4153
	  gfc_conv_descriptor_data_set (&lse.pre, lse.expr, null_pointer_node);
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	  break;

	case EXPR_VARIABLE:
	  /* Assign directly to the pointer's descriptor.  */
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	  lse.direct_byref = 1;
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	  gfc_conv_expr_descriptor (&lse, expr2, rss);
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	  strlen_rhs = lse.string_length;
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	  /* If this is a subreference array pointer assignment, use the rhs
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	     descriptor element size for the lhs span.  */
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	  if (expr1->symtree->n.sym->attr.subref_array_pointer)
	    {
	      decl = expr1->symtree->n.sym->backend_decl;
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	      gfc_init_se (&rse, NULL);
	      rse.descriptor_only = 1;
	      gfc_conv_expr (&rse, expr2);
	      tmp = gfc_get_element_type (TREE_TYPE (rse.expr));
	      tmp = fold_convert (gfc_array_index_type, size_in_bytes (tmp));
	      if (!INTEGER_CST_P (tmp))
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		gfc_add_block_to_block (&lse.post, &rse.pre);
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	      gfc_add_modify (&lse.post, GFC_DECL_SPAN(decl), tmp);
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	    }

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	  break;

	default:
	  /* Assign to a temporary descriptor and then copy that
	     temporary to the pointer.  */
	  desc = lse.expr;
	  tmp = gfc_create_var (TREE_TYPE (desc), "ptrtemp");

	  lse.expr = tmp;
	  lse.direct_byref = 1;
	  gfc_conv_expr_descriptor (&lse, expr2, rss);
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	  strlen_rhs = lse.string_length;
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	  gfc_add_modify (&lse.pre, desc, tmp);
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	  break;
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	}

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      gfc_add_block_to_block (&block, &lse.pre);
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      /* Check string lengths if applicable.  The check is only really added
	 to the output code if -fbounds-check is enabled.  */
      if (expr1->ts.type == BT_CHARACTER && expr2->expr_type != EXPR_NULL)
	{
	  gcc_assert (expr2->ts.type == BT_CHARACTER);
	  gcc_assert (strlen_lhs && strlen_rhs);
	  gfc_trans_same_strlen_check ("pointer assignment", &expr1->where,
				       strlen_lhs, strlen_rhs, &block);
	}

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      gfc_add_block_to_block (&block, &lse.post);
    }
  return gfc_finish_block (&block);
}


/* Makes sure se is suitable for passing as a function string parameter.  */
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/* TODO: Need to check all callers of this function.  It may be abused.  */
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void
gfc_conv_string_parameter (gfc_se * se)
{
  tree type;

  if (TREE_CODE (se->expr) == STRING_CST)
    {
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      type = TREE_TYPE (TREE_TYPE (se->expr));
      se->expr = gfc_build_addr_expr (build_pointer_type (type), se->expr);
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      return;
    }

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  if (TYPE_STRING_FLAG (TREE_TYPE (se->expr)))
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    {
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      if (TREE_CODE (se->expr) != INDIRECT_REF)
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	{
	  type = TREE_TYPE (se->expr);
          se->expr = gfc_build_addr_expr (build_pointer_type (type), se->expr);
	}
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      else
	{
	  type = gfc_get_character_type_len (gfc_default_character_kind,
					     se->string_length);
	  type = build_pointer_type (type);
	  se->expr = gfc_build_addr_expr (type, se->expr);
	}
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    }

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  gcc_assert (POINTER_TYPE_P (TREE_TYPE (se->expr)));
  gcc_assert (se->string_length
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	  && TREE_CODE (TREE_TYPE (se->string_length)) == INTEGER_TYPE);
}


/* Generate code for assignment of scalar variables.  Includes character
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   strings and derived types with allocatable components.  */
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tree
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gfc_trans_scalar_assign (gfc_se * lse, gfc_se * rse, gfc_typespec ts,
			 bool l_is_temp, bool r_is_var)
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{
  stmtblock_t block;
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  tree tmp;
  tree cond;
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  gfc_init_block (&block);

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  if (ts.type == BT_CHARACTER)
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    {
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      tree rlen = NULL;
      tree llen = NULL;
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      if (lse->string_length != NULL_TREE)
	{
	  gfc_conv_string_parameter (lse);
	  gfc_add_block_to_block (&block, &lse->pre);
	  llen = lse->string_length;
	}
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      if (rse->string_length != NULL_TREE)
	{
	  gcc_assert (rse->string_length != NULL_TREE);
	  gfc_conv_string_parameter (rse);
	  gfc_add_block_to_block (&block, &rse->pre);
	  rlen = rse->string_length;
	}
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      gfc_trans_string_copy (&block, llen, lse->expr, ts.kind, rlen,
			     rse->expr, ts.kind);
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    }
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  else if (ts.type == BT_DERIVED && ts.derived->attr.alloc_comp)
    {
      cond = NULL_TREE;
	
      /* Are the rhs and the lhs the same?  */
      if (r_is_var)
	{
	  cond = fold_build2 (EQ_EXPR, boolean_type_node,
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			      gfc_build_addr_expr (NULL_TREE, lse->expr),
			      gfc_build_addr_expr (NULL_TREE, rse->expr));
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	  cond = gfc_evaluate_now (cond, &lse->pre);
	}

      /* Deallocate the lhs allocated components as long as it is not
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	 the same as the rhs.  This must be done following the assignment
	 to prevent deallocating data that could be used in the rhs
	 expression.  */
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      if (!l_is_temp)
	{
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	  tmp = gfc_evaluate_now (lse->expr, &lse->pre);
	  tmp = gfc_deallocate_alloc_comp (ts.derived, tmp, 0);
4305
	  if (r_is_var)
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	    tmp = build3_v (COND_EXPR, cond, build_empty_stmt (input_location),
			    tmp);
4308
	  gfc_add_expr_to_block (&lse->post, tmp);
4309
	}
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      gfc_add_block_to_block (&block, &rse->pre);
      gfc_add_block_to_block (&block, &lse->pre);
4313

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      gfc_add_modify (&block, lse->expr,
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			   fold_convert (TREE_TYPE (lse->expr), rse->expr));

      /* Do a deep copy if the rhs is a variable, if it is not the
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	 same as the lhs.  */
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      if (r_is_var)
	{
	  tmp = gfc_copy_alloc_comp (ts.derived, rse->expr, lse->expr, 0);
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	  tmp = build3_v (COND_EXPR, cond, build_empty_stmt (input_location),
			  tmp);
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	  gfc_add_expr_to_block (&block, tmp);
	}
    }
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  else
    {
      gfc_add_block_to_block (&block, &lse->pre);
      gfc_add_block_to_block (&block, &rse->pre);

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      gfc_add_modify (&block, lse->expr,
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			   fold_convert (TREE_TYPE (lse->expr), rse->expr));
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    }

  gfc_add_block_to_block (&block, &lse->post);
  gfc_add_block_to_block (&block, &rse->post);

  return gfc_finish_block (&block);
}


/* Try to translate array(:) = func (...), where func is a transformational
   array function, without using a temporary.  Returns NULL is this isn't the
   case.  */

static tree
gfc_trans_arrayfunc_assign (gfc_expr * expr1, gfc_expr * expr2)
{
  gfc_se se;
  gfc_ss *ss;
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  gfc_ref * ref;
  bool seen_array_ref;
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  bool c = false;
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  gfc_component *comp = NULL;
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  /* The caller has already checked rank>0 and expr_type == EXPR_FUNCTION.  */
  if (expr2->value.function.isym && !gfc_is_intrinsic_libcall (expr2))
    return NULL;

  /* Elemental functions don't need a temporary anyway.  */
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  if (expr2->value.function.esym != NULL
      && expr2->value.function.esym->attr.elemental)
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    return NULL;

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  /* Fail if rhs is not FULL or a contiguous section.  */
  if (expr1->ref && !(gfc_full_array_ref_p (expr1->ref, &c) || c))
    return NULL;

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  /* Fail if EXPR1 can't be expressed as a descriptor.  */
  if (gfc_ref_needs_temporary_p (expr1->ref))
    return NULL;

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  /* Functions returning pointers need temporaries.  */
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  if (expr2->symtree->n.sym->attr.pointer 
      || expr2->symtree->n.sym->attr.allocatable)
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    return NULL;

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  /* Character array functions need temporaries unless the
     character lengths are the same.  */
  if (expr2->ts.type == BT_CHARACTER && expr2->rank > 0)
    {
      if (expr1->ts.cl->length == NULL
	    || expr1->ts.cl->length->expr_type != EXPR_CONSTANT)
	return NULL;

      if (expr2->ts.cl->length == NULL
	    || expr2->ts.cl->length->expr_type != EXPR_CONSTANT)
	return NULL;

      if (mpz_cmp (expr1->ts.cl->length->value.integer,
		     expr2->ts.cl->length->value.integer) != 0)
	return NULL;
    }

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  /* Check that no LHS component references appear during an array
     reference. This is needed because we do not have the means to
     span any arbitrary stride with an array descriptor. This check
     is not needed for the rhs because the function result has to be
     a complete type.  */
  seen_array_ref = false;
  for (ref = expr1->ref; ref; ref = ref->next)
    {
      if (ref->type == REF_ARRAY)
	seen_array_ref= true;
      else if (ref->type == REF_COMPONENT && seen_array_ref)
	return NULL;
    }

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  /* Check for a dependency.  */
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  if (gfc_check_fncall_dependency (expr1, INTENT_OUT,
				   expr2->value.function.esym,
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				   expr2->value.function.actual,
				   NOT_ELEMENTAL))
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    return NULL;

  /* The frontend doesn't seem to bother filling in expr->symtree for intrinsic
     functions.  */
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  is_proc_ptr_comp(expr2, &comp);
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  gcc_assert (expr2->value.function.isym
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	      || (comp && comp->attr.dimension)
	      || (!comp && gfc_return_by_reference (expr2->value.function.esym)
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	      && expr2->value.function.esym->result->attr.dimension));
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  ss = gfc_walk_expr (expr1);
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  gcc_assert (ss != gfc_ss_terminator);
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  gfc_init_se (&se, NULL);
  gfc_start_block (&se.pre);
  se.want_pointer = 1;

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  gfc_conv_array_parameter (&se, expr1, ss, 0, NULL, NULL, NULL);
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  se.direct_byref = 1;
  se.ss = gfc_walk_expr (expr2);
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  gcc_assert (se.ss != gfc_ss_terminator);
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  gfc_conv_function_expr (&se, expr2);
  gfc_add_block_to_block (&se.pre, &se.post);

  return gfc_finish_block (&se.pre);
}

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/* Determine whether the given EXPR_CONSTANT is a zero initializer.  */

static bool
is_zero_initializer_p (gfc_expr * expr)
{
  if (expr->expr_type != EXPR_CONSTANT)
    return false;
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  /* We ignore constants with prescribed memory representations for now.  */
  if (expr->representation.string)
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    return false;

  switch (expr->ts.type)
    {
    case BT_INTEGER:
      return mpz_cmp_si (expr->value.integer, 0) == 0;

    case BT_REAL:
      return mpfr_zero_p (expr->value.real)
	     && MPFR_SIGN (expr->value.real) >= 0;

    case BT_LOGICAL:
      return expr->value.logical == 0;

    case BT_COMPLEX:
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      return mpfr_zero_p (mpc_realref (expr->value.complex))
	     && MPFR_SIGN (mpc_realref (expr->value.complex)) >= 0
             && mpfr_zero_p (mpc_imagref (expr->value.complex))
	     && MPFR_SIGN (mpc_imagref (expr->value.complex)) >= 0;
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    default:
      break;
    }
  return false;
}

/* Try to efficiently translate array(:) = 0.  Return NULL if this
   can't be done.  */

static tree
gfc_trans_zero_assign (gfc_expr * expr)
{
  tree dest, len, type;
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  tree tmp;
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  gfc_symbol *sym;

  sym = expr->symtree->n.sym;
  dest = gfc_get_symbol_decl (sym);

  type = TREE_TYPE (dest);
  if (POINTER_TYPE_P (type))
    type = TREE_TYPE (type);
  if (!GFC_ARRAY_TYPE_P (type))
    return NULL_TREE;

  /* Determine the length of the array.  */
  len = GFC_TYPE_ARRAY_SIZE (type);
  if (!len || TREE_CODE (len) != INTEGER_CST)
    return NULL_TREE;

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  tmp = TYPE_SIZE_UNIT (gfc_get_element_type (type));
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  len = fold_build2 (MULT_EXPR, gfc_array_index_type, len,
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		     fold_convert (gfc_array_index_type, tmp));
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  /* If we are zeroing a local array avoid taking its address by emitting
     a = {} instead.  */
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  if (!POINTER_TYPE_P (TREE_TYPE (dest)))
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    return build2 (MODIFY_EXPR, void_type_node,
		   dest, build_constructor (TREE_TYPE (dest), NULL));

  /* Convert arguments to the correct types.  */
  dest = fold_convert (pvoid_type_node, dest);
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  len = fold_convert (size_type_node, len);

  /* Construct call to __builtin_memset.  */
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  tmp = build_call_expr (built_in_decls[BUILT_IN_MEMSET],
			 3, dest, integer_zero_node, len);
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  return fold_convert (void_type_node, tmp);
}
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/* Helper for gfc_trans_array_copy and gfc_trans_array_constructor_copy
   that constructs the call to __builtin_memcpy.  */

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tree
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gfc_build_memcpy_call (tree dst, tree src, tree len)
{
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  tree tmp;
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  /* Convert arguments to the correct types.  */
  if (!POINTER_TYPE_P (TREE_TYPE (dst)))
    dst = gfc_build_addr_expr (pvoid_type_node, dst);
  else
    dst = fold_convert (pvoid_type_node, dst);

  if (!POINTER_TYPE_P (TREE_TYPE (src)))
    src = gfc_build_addr_expr (pvoid_type_node, src);
  else
    src = fold_convert (pvoid_type_node, src);

  len = fold_convert (size_type_node, len);

  /* Construct call to __builtin_memcpy.  */
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  tmp = build_call_expr (built_in_decls[BUILT_IN_MEMCPY], 3, dst, src, len);
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  return fold_convert (void_type_node, tmp);
}


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/* Try to efficiently translate dst(:) = src(:).  Return NULL if this
   can't be done.  EXPR1 is the destination/lhs and EXPR2 is the
   source/rhs, both are gfc_full_array_ref_p which have been checked for
   dependencies.  */
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static tree
gfc_trans_array_copy (gfc_expr * expr1, gfc_expr * expr2)
{
  tree dst, dlen, dtype;
  tree src, slen, stype;
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  tree tmp;
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  dst = gfc_get_symbol_decl (expr1->symtree->n.sym);
  src = gfc_get_symbol_decl (expr2->symtree->n.sym);

  dtype = TREE_TYPE (dst);
  if (POINTER_TYPE_P (dtype))
    dtype = TREE_TYPE (dtype);
  stype = TREE_TYPE (src);
  if (POINTER_TYPE_P (stype))
    stype = TREE_TYPE (stype);

  if (!GFC_ARRAY_TYPE_P (dtype) || !GFC_ARRAY_TYPE_P (stype))
    return NULL_TREE;

  /* Determine the lengths of the arrays.  */
  dlen = GFC_TYPE_ARRAY_SIZE (dtype);
  if (!dlen || TREE_CODE (dlen) != INTEGER_CST)
    return NULL_TREE;
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  tmp = TYPE_SIZE_UNIT (gfc_get_element_type (dtype));
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  dlen = fold_build2 (MULT_EXPR, gfc_array_index_type, dlen,
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		      fold_convert (gfc_array_index_type, tmp));
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  slen = GFC_TYPE_ARRAY_SIZE (stype);
  if (!slen || TREE_CODE (slen) != INTEGER_CST)
    return NULL_TREE;
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  tmp = TYPE_SIZE_UNIT (gfc_get_element_type (stype));
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  slen = fold_build2 (MULT_EXPR, gfc_array_index_type, slen,
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		      fold_convert (gfc_array_index_type, tmp));
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  /* Sanity check that they are the same.  This should always be
     the case, as we should already have checked for conformance.  */
  if (!tree_int_cst_equal (slen, dlen))
    return NULL_TREE;

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  return gfc_build_memcpy_call (dst, src, dlen);
}
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/* Try to efficiently translate array(:) = (/ ... /).  Return NULL if
   this can't be done.  EXPR1 is the destination/lhs for which
   gfc_full_array_ref_p is true, and EXPR2 is the source/rhs.  */
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static tree
gfc_trans_array_constructor_copy (gfc_expr * expr1, gfc_expr * expr2)
{
  unsigned HOST_WIDE_INT nelem;
  tree dst, dtype;
  tree src, stype;
  tree len;
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  tree tmp;
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  nelem = gfc_constant_array_constructor_p (expr2->value.constructor);
  if (nelem == 0)
    return NULL_TREE;

  dst = gfc_get_symbol_decl (expr1->symtree->n.sym);
  dtype = TREE_TYPE (dst);
  if (POINTER_TYPE_P (dtype))
    dtype = TREE_TYPE (dtype);
  if (!GFC_ARRAY_TYPE_P (dtype))
    return NULL_TREE;

  /* Determine the lengths of the array.  */
  len = GFC_TYPE_ARRAY_SIZE (dtype);
  if (!len || TREE_CODE (len) != INTEGER_CST)
    return NULL_TREE;

  /* Confirm that the constructor is the same size.  */
  if (compare_tree_int (len, nelem) != 0)
    return NULL_TREE;

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  tmp = TYPE_SIZE_UNIT (gfc_get_element_type (dtype));
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  len = fold_build2 (MULT_EXPR, gfc_array_index_type, len,
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		     fold_convert (gfc_array_index_type, tmp));
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  stype = gfc_typenode_for_spec (&expr2->ts);
  src = gfc_build_constant_array_constructor (expr2, stype);

  stype = TREE_TYPE (src);
  if (POINTER_TYPE_P (stype))
    stype = TREE_TYPE (stype);

  return gfc_build_memcpy_call (dst, src, len);
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}


/* Subroutine of gfc_trans_assignment that actually scalarizes the
   assignment.  EXPR1 is the destination/RHS and EXPR2 is the source/LHS.  */

static tree
gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
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{
  gfc_se lse;
  gfc_se rse;
  gfc_ss *lss;
  gfc_ss *lss_section;
  gfc_ss *rss;
  gfc_loopinfo loop;
  tree tmp;
  stmtblock_t block;
  stmtblock_t body;
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  bool l_is_temp;
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  bool scalar_to_array;
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  tree string_length;
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  /* Assignment of the form lhs = rhs.  */
  gfc_start_block (&block);

  gfc_init_se (&lse, NULL);
  gfc_init_se (&rse, NULL);

  /* Walk the lhs.  */
  lss = gfc_walk_expr (expr1);
  rss = NULL;
  if (lss != gfc_ss_terminator)
    {
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      /* Allow the scalarizer to workshare array assignments.  */
      if (ompws_flags & OMPWS_WORKSHARE_FLAG)
	ompws_flags |= OMPWS_SCALARIZER_WS;

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      /* The assignment needs scalarization.  */
      lss_section = lss;

      /* Find a non-scalar SS from the lhs.  */
      while (lss_section != gfc_ss_terminator
	     && lss_section->type != GFC_SS_SECTION)
	lss_section = lss_section->next;

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      gcc_assert (lss_section != gfc_ss_terminator);
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      /* Initialize the scalarizer.  */
      gfc_init_loopinfo (&loop);

      /* Walk the rhs.  */
      rss = gfc_walk_expr (expr2);
      if (rss == gfc_ss_terminator)
	{
	  /* The rhs is scalar.  Add a ss for the expression.  */
	  rss = gfc_get_ss ();
	  rss->next = gfc_ss_terminator;
	  rss->type = GFC_SS_SCALAR;
	  rss->expr = expr2;
	}
      /* Associate the SS with the loop.  */
      gfc_add_ss_to_loop (&loop, lss);
      gfc_add_ss_to_loop (&loop, rss);

      /* Calculate the bounds of the scalarization.  */
      gfc_conv_ss_startstride (&loop);
      /* Resolve any data dependencies in the statement.  */
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      gfc_conv_resolve_dependencies (&loop, lss, rss);
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      /* Setup the scalarizing loops.  */
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      gfc_conv_loop_setup (&loop, &expr2->where);
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      /* Setup the gfc_se structures.  */
      gfc_copy_loopinfo_to_se (&lse, &loop);
      gfc_copy_loopinfo_to_se (&rse, &loop);

      rse.ss = rss;
      gfc_mark_ss_chain_used (rss, 1);
      if (loop.temp_ss == NULL)
	{
	  lse.ss = lss;
	  gfc_mark_ss_chain_used (lss, 1);
	}
      else
	{
	  lse.ss = loop.temp_ss;
	  gfc_mark_ss_chain_used (lss, 3);
	  gfc_mark_ss_chain_used (loop.temp_ss, 3);
	}

      /* Start the scalarized loop body.  */
      gfc_start_scalarized_body (&loop, &body);
    }
  else
    gfc_init_block (&body);

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  l_is_temp = (lss != gfc_ss_terminator && loop.temp_ss != NULL);

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  /* Translate the expression.  */
  gfc_conv_expr (&rse, expr2);

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  /* Stabilize a string length for temporaries.  */
  if (expr2->ts.type == BT_CHARACTER)
    string_length = gfc_evaluate_now (rse.string_length, &rse.pre);
  else
    string_length = NULL_TREE;

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  if (l_is_temp)
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    {
      gfc_conv_tmp_array_ref (&lse);
      gfc_advance_se_ss_chain (&lse);
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      if (expr2->ts.type == BT_CHARACTER)
	lse.string_length = string_length;
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    }
  else
    gfc_conv_expr (&lse, expr1);
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  /* Assignments of scalar derived types with allocatable components
     to arrays must be done with a deep copy and the rhs temporary
     must have its components deallocated afterwards.  */
  scalar_to_array = (expr2->ts.type == BT_DERIVED
		       && expr2->ts.derived->attr.alloc_comp
		       && expr2->expr_type != EXPR_VARIABLE
		       && !gfc_is_constant_expr (expr2)
		       && expr1->rank && !expr2->rank);
  if (scalar_to_array)
    {
      tmp = gfc_deallocate_alloc_comp (expr2->ts.derived, rse.expr, 0);
      gfc_add_expr_to_block (&loop.post, tmp);
    }

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  tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts,
				 l_is_temp || init_flag,
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				 (expr2->expr_type == EXPR_VARIABLE)
				    || scalar_to_array);
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  gfc_add_expr_to_block (&body, tmp);

  if (lss == gfc_ss_terminator)
    {
      /* Use the scalar assignment as is.  */
      gfc_add_block_to_block (&block, &body);
    }
  else
    {
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      gcc_assert (lse.ss == gfc_ss_terminator
		  && rse.ss == gfc_ss_terminator);
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      if (l_is_temp)
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	{
	  gfc_trans_scalarized_loop_boundary (&loop, &body);

	  /* We need to copy the temporary to the actual lhs.  */
	  gfc_init_se (&lse, NULL);
	  gfc_init_se (&rse, NULL);
	  gfc_copy_loopinfo_to_se (&lse, &loop);
	  gfc_copy_loopinfo_to_se (&rse, &loop);

	  rse.ss = loop.temp_ss;
	  lse.ss = lss;

	  gfc_conv_tmp_array_ref (&rse);
	  gfc_advance_se_ss_chain (&rse);
	  gfc_conv_expr (&lse, expr1);

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	  gcc_assert (lse.ss == gfc_ss_terminator
		      && rse.ss == gfc_ss_terminator);
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	  if (expr2->ts.type == BT_CHARACTER)
	    rse.string_length = string_length;

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	  tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts,
					 false, false);
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	  gfc_add_expr_to_block (&body, tmp);
	}
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      /* Generate the copying loops.  */
      gfc_trans_scalarizing_loops (&loop, &body);

      /* Wrap the whole thing up.  */
      gfc_add_block_to_block (&block, &loop.pre);
      gfc_add_block_to_block (&block, &loop.post);

      gfc_cleanup_loop (&loop);
    }

  return gfc_finish_block (&block);
}

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/* Check whether EXPR is a copyable array.  */
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static bool
copyable_array_p (gfc_expr * expr)
{
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  if (expr->expr_type != EXPR_VARIABLE)
    return false;

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  /* First check it's an array.  */
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  if (expr->rank < 1 || !expr->ref || expr->ref->next)
    return false;

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  if (!gfc_full_array_ref_p (expr->ref, NULL))
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    return false;

  /* Next check that it's of a simple enough type.  */
  switch (expr->ts.type)
    {
    case BT_INTEGER:
    case BT_REAL:
    case BT_COMPLEX:
    case BT_LOGICAL:
      return true;

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    case BT_CHARACTER:
      return false;

    case BT_DERIVED:
      return !expr->ts.derived->attr.alloc_comp;

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    default:
      break;
    }

  return false;
}

/* Translate an assignment.  */

tree
gfc_trans_assignment (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
{
  tree tmp;

  /* Special case a single function returning an array.  */
  if (expr2->expr_type == EXPR_FUNCTION && expr2->rank > 0)
    {
      tmp = gfc_trans_arrayfunc_assign (expr1, expr2);
      if (tmp)
	return tmp;
    }

  /* Special case assigning an array to zero.  */
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  if (copyable_array_p (expr1)
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      && is_zero_initializer_p (expr2))
    {
      tmp = gfc_trans_zero_assign (expr1);
      if (tmp)
        return tmp;
    }

  /* Special case copying one array to another.  */
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  if (copyable_array_p (expr1)
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      && copyable_array_p (expr2)
      && gfc_compare_types (&expr1->ts, &expr2->ts)
      && !gfc_check_dependency (expr1, expr2, 0))
    {
      tmp = gfc_trans_array_copy (expr1, expr2);
      if (tmp)
        return tmp;
    }

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  /* Special case initializing an array from a constant array constructor.  */
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  if (copyable_array_p (expr1)
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      && expr2->expr_type == EXPR_ARRAY
      && gfc_compare_types (&expr1->ts, &expr2->ts))
    {
      tmp = gfc_trans_array_constructor_copy (expr1, expr2);
      if (tmp)
	return tmp;
    }

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  /* Fallback to the scalarizer to generate explicit loops.  */
  return gfc_trans_assignment_1 (expr1, expr2, init_flag);
}

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tree
gfc_trans_init_assign (gfc_code * code)
{
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  return gfc_trans_assignment (code->expr1, code->expr2, true);
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}

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tree
gfc_trans_assign (gfc_code * code)
{
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  return gfc_trans_assignment (code->expr1, code->expr2, false);
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}