--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/fortran/check.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,6502 @@
+/* Check functions
+   Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   Contributed by Andy Vaught & Katherine Holcomb
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+
+/* These functions check to see if an argument list is compatible with
+   a particular intrinsic function or subroutine.  Presence of
+   required arguments has already been established, the argument list
+   has been sorted into the right order and has NULL arguments in the
+   correct places for missing optional arguments.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "options.h"
+#include "gfortran.h"
+#include "intrinsic.h"
+#include "constructor.h"
+#include "target-memory.h"
+
+
+/* Make sure an expression is a scalar.  */
+
+static bool
+scalar_check (gfc_expr *e, int n)
+{
+  if (e->rank == 0)
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be a scalar",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where);
+
+  return false;
+}
+
+
+/* Check the type of an expression.  */
+
+static bool
+type_check (gfc_expr *e, int n, bt type)
+{
+  if (e->ts.type == type)
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be %s",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where, gfc_basic_typename (type));
+
+  return false;
+}
+
+
+/* Check that the expression is a numeric type.  */
+
+static bool
+numeric_check (gfc_expr *e, int n)
+{
+  /* Users sometime use a subroutine designator as an actual argument to
+     an intrinsic subprogram that expects an argument with a numeric type.  */
+  if (e->symtree && e->symtree->n.sym->attr.subroutine)
+    goto error;
+
+  if (gfc_numeric_ts (&e->ts))
+    return true;
+
+  /* If the expression has not got a type, check if its namespace can
+     offer a default type.  */
+  if ((e->expr_type == EXPR_VARIABLE || e->expr_type == EXPR_FUNCTION)
+	&& e->symtree->n.sym->ts.type == BT_UNKNOWN
+	&& gfc_set_default_type (e->symtree->n.sym, 0, e->symtree->n.sym->ns)
+	&& gfc_numeric_ts (&e->symtree->n.sym->ts))
+    {
+      e->ts = e->symtree->n.sym->ts;
+      return true;
+    }
+
+error:
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must have a numeric type",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where);
+
+  return false;
+}
+
+
+/* Check that an expression is integer or real.  */
+
+static bool
+int_or_real_check (gfc_expr *e, int n)
+{
+  if (e->ts.type != BT_INTEGER && e->ts.type != BT_REAL)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be INTEGER "
+		 "or REAL", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &e->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Check that an expression is real or complex.  */
+
+static bool
+real_or_complex_check (gfc_expr *e, int n)
+{
+  if (e->ts.type != BT_REAL && e->ts.type != BT_COMPLEX)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be REAL "
+		 "or COMPLEX", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &e->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Check that an expression is INTEGER or PROCEDURE.  */
+
+static bool
+int_or_proc_check (gfc_expr *e, int n)
+{
+  if (e->ts.type != BT_INTEGER && e->ts.type != BT_PROCEDURE)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be INTEGER "
+		 "or PROCEDURE", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &e->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Check that the expression is an optional constant integer
+   and that it specifies a valid kind for that type.  */
+
+static bool
+kind_check (gfc_expr *k, int n, bt type)
+{
+  int kind;
+
+  if (k == NULL)
+    return true;
+
+  if (!type_check (k, n, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (k, n))
+    return false;
+
+  if (!gfc_check_init_expr (k))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a constant",
+		 gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+		 &k->where);
+      return false;
+    }
+
+  if (gfc_extract_int (k, &kind)
+      || gfc_validate_kind (type, kind, true) < 0)
+    {
+      gfc_error ("Invalid kind for %s at %L", gfc_basic_typename (type),
+		 &k->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Make sure the expression is a double precision real.  */
+
+static bool
+double_check (gfc_expr *d, int n)
+{
+  if (!type_check (d, n, BT_REAL))
+    return false;
+
+  if (d->ts.kind != gfc_default_double_kind)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be double "
+		 "precision", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &d->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+static bool
+coarray_check (gfc_expr *e, int n)
+{
+  if (e->ts.type == BT_CLASS && gfc_expr_attr (e).class_ok
+	&& CLASS_DATA (e)->attr.codimension
+	&& CLASS_DATA (e)->as->corank)
+    {
+      gfc_add_class_array_ref (e);
+      return true;
+    }
+
+  if (!gfc_is_coarray (e))
+    {
+      gfc_error ("Expected coarray variable as %qs argument to the %s "
+                 "intrinsic at %L", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &e->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Make sure the expression is a logical array.  */
+
+static bool
+logical_array_check (gfc_expr *array, int n)
+{
+  if (array->ts.type != BT_LOGICAL || array->rank == 0)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a logical "
+		 "array", gfc_current_intrinsic_arg[n]->name,
+		 gfc_current_intrinsic, &array->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Make sure an expression is an array.  */
+
+static bool
+array_check (gfc_expr *e, int n)
+{
+  if (e->ts.type == BT_CLASS && gfc_expr_attr (e).class_ok
+	&& CLASS_DATA (e)->attr.dimension
+	&& CLASS_DATA (e)->as->rank)
+    {
+      gfc_add_class_array_ref (e);
+      return true;
+    }
+
+  if (e->rank != 0 && e->ts.type != BT_PROCEDURE)
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be an array",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where);
+
+  return false;
+}
+
+
+/* If expr is a constant, then check to ensure that it is greater than
+   of equal to zero.  */
+
+static bool
+nonnegative_check (const char *arg, gfc_expr *expr)
+{
+  int i;
+
+  if (expr->expr_type == EXPR_CONSTANT)
+    {
+      gfc_extract_int (expr, &i);
+      if (i < 0)
+	{
+	  gfc_error ("%qs at %L must be nonnegative", arg, &expr->where);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+/* If expr is a constant, then check to ensure that it is greater than zero.  */
+
+static bool
+positive_check (int n, gfc_expr *expr)
+{
+  int i;
+
+  if (expr->expr_type == EXPR_CONSTANT)
+    {
+      gfc_extract_int (expr, &i);
+      if (i <= 0)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must be positive",
+		     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+		     &expr->where);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+/* If expr2 is constant, then check that the value is less than
+   (less than or equal to, if 'or_equal' is true) bit_size(expr1).  */
+
+static bool
+less_than_bitsize1 (const char *arg1, gfc_expr *expr1, const char *arg2,
+		    gfc_expr *expr2, bool or_equal)
+{
+  int i2, i3;
+
+  if (expr2->expr_type == EXPR_CONSTANT)
+    {
+      gfc_extract_int (expr2, &i2);
+      i3 = gfc_validate_kind (BT_INTEGER, expr1->ts.kind, false);
+
+      /* For ISHFT[C], check that |shift| <= bit_size(i).  */
+      if (arg2 == NULL)
+	{
+	  if (i2 < 0)
+	    i2 = -i2;
+
+	  if (i2 > gfc_integer_kinds[i3].bit_size)
+	    {
+	      gfc_error ("The absolute value of SHIFT at %L must be less "
+			 "than or equal to BIT_SIZE(%qs)",
+			 &expr2->where, arg1);
+	      return false;
+	    }
+	}
+
+      if (or_equal)
+	{
+	  if (i2 > gfc_integer_kinds[i3].bit_size)
+	    {
+	      gfc_error ("%qs at %L must be less than "
+			 "or equal to BIT_SIZE(%qs)",
+			 arg2, &expr2->where, arg1);
+	      return false;
+	    }
+	}
+      else
+	{
+	  if (i2 >= gfc_integer_kinds[i3].bit_size)
+	    {
+	      gfc_error ("%qs at %L must be less than BIT_SIZE(%qs)",
+			 arg2, &expr2->where, arg1);
+	      return false;
+	    }
+	}
+    }
+
+  return true;
+}
+
+
+/* If expr is constant, then check that the value is less than or equal
+   to the bit_size of the kind k.  */
+
+static bool
+less_than_bitsizekind (const char *arg, gfc_expr *expr, int k)
+{
+  int i, val;
+
+  if (expr->expr_type != EXPR_CONSTANT)
+    return true;
+
+  i = gfc_validate_kind (BT_INTEGER, k, false);
+  gfc_extract_int (expr, &val);
+
+  if (val > gfc_integer_kinds[i].bit_size)
+    {
+      gfc_error ("%qs at %L must be less than or equal to the BIT_SIZE of "
+		 "INTEGER(KIND=%d)", arg, &expr->where, k);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* If expr2 and expr3 are constants, then check that the value is less than
+   or equal to bit_size(expr1).  */
+
+static bool
+less_than_bitsize2 (const char *arg1, gfc_expr *expr1, const char *arg2,
+	       gfc_expr *expr2, const char *arg3, gfc_expr *expr3)
+{
+  int i2, i3;
+
+  if (expr2->expr_type == EXPR_CONSTANT && expr3->expr_type == EXPR_CONSTANT)
+    {
+      gfc_extract_int (expr2, &i2);
+      gfc_extract_int (expr3, &i3);
+      i2 += i3;
+      i3 = gfc_validate_kind (BT_INTEGER, expr1->ts.kind, false);
+      if (i2 > gfc_integer_kinds[i3].bit_size)
+	{
+	  gfc_error ("%<%s + %s%> at %L must be less than or equal "
+		     "to BIT_SIZE(%qs)",
+		     arg2, arg3, &expr2->where, arg1);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+/* Make sure two expressions have the same type.  */
+
+static bool
+same_type_check (gfc_expr *e, int n, gfc_expr *f, int m)
+{
+  gfc_typespec *ets = &e->ts;
+  gfc_typespec *fts = &f->ts;
+
+  if (e->ts.type == BT_PROCEDURE && e->symtree->n.sym)
+    ets = &e->symtree->n.sym->ts;
+  if (f->ts.type == BT_PROCEDURE && f->symtree->n.sym)
+    fts = &f->symtree->n.sym->ts;
+
+  if (gfc_compare_types (ets, fts))
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be the same type "
+	     "and kind as %qs", gfc_current_intrinsic_arg[m]->name,
+	     gfc_current_intrinsic, &f->where,
+	     gfc_current_intrinsic_arg[n]->name);
+
+  return false;
+}
+
+
+/* Make sure that an expression has a certain (nonzero) rank.  */
+
+static bool
+rank_check (gfc_expr *e, int n, int rank)
+{
+  if (e->rank == rank)
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be of rank %d",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where, rank);
+
+  return false;
+}
+
+
+/* Make sure a variable expression is not an optional dummy argument.  */
+
+static bool
+nonoptional_check (gfc_expr *e, int n)
+{
+  if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym->attr.optional)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must not be OPTIONAL",
+		 gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+		 &e->where);
+    }
+
+  /* TODO: Recursive check on nonoptional variables?  */
+
+  return true;
+}
+
+
+/* Check for ALLOCATABLE attribute.  */
+
+static bool
+allocatable_check (gfc_expr *e, int n)
+{
+  symbol_attribute attr;
+
+  attr = gfc_variable_attr (e, NULL);
+  if (!attr.allocatable || attr.associate_var)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be ALLOCATABLE",
+		 gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+		 &e->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Check that an expression has a particular kind.  */
+
+static bool
+kind_value_check (gfc_expr *e, int n, int k)
+{
+  if (e->ts.kind == k)
+    return true;
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be of kind %d",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic,
+	     &e->where, k);
+
+  return false;
+}
+
+
+/* Make sure an expression is a variable.  */
+
+static bool
+variable_check (gfc_expr *e, int n, bool allow_proc)
+{
+  if (e->expr_type == EXPR_VARIABLE
+      && e->symtree->n.sym->attr.intent == INTENT_IN
+      && (gfc_current_intrinsic_arg[n]->intent == INTENT_OUT
+	  || gfc_current_intrinsic_arg[n]->intent == INTENT_INOUT))
+    {
+      gfc_ref *ref;
+      bool pointer = e->symtree->n.sym->ts.type == BT_CLASS
+		     && CLASS_DATA (e->symtree->n.sym)
+		     ? CLASS_DATA (e->symtree->n.sym)->attr.class_pointer
+		     : e->symtree->n.sym->attr.pointer;
+
+      for (ref = e->ref; ref; ref = ref->next)
+	{
+	  if (pointer && ref->type == REF_COMPONENT)
+	    break;
+	  if (ref->type == REF_COMPONENT
+	      && ((ref->u.c.component->ts.type == BT_CLASS
+		   && CLASS_DATA (ref->u.c.component)->attr.class_pointer)
+		  || (ref->u.c.component->ts.type != BT_CLASS
+		      && ref->u.c.component->attr.pointer)))
+	    break;
+	}
+
+      if (!ref)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L cannot be "
+		     "INTENT(IN)", gfc_current_intrinsic_arg[n]->name,
+		     gfc_current_intrinsic, &e->where);
+	  return false;
+	}
+    }
+
+  if (e->expr_type == EXPR_VARIABLE
+      && e->symtree->n.sym->attr.flavor != FL_PARAMETER
+      && (allow_proc || !e->symtree->n.sym->attr.function))
+    return true;
+
+  if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym->attr.function
+      && e->symtree->n.sym == e->symtree->n.sym->result)
+    {
+      gfc_namespace *ns;
+      for (ns = gfc_current_ns; ns; ns = ns->parent)
+	if (ns->proc_name == e->symtree->n.sym)
+	  return true;
+    }
+
+  gfc_error ("%qs argument of %qs intrinsic at %L must be a variable",
+	     gfc_current_intrinsic_arg[n]->name, gfc_current_intrinsic, &e->where);
+
+  return false;
+}
+
+
+/* Check the common DIM parameter for correctness.  */
+
+static bool
+dim_check (gfc_expr *dim, int n, bool optional)
+{
+  if (dim == NULL)
+    return true;
+
+  if (!type_check (dim, n, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (dim, n))
+    return false;
+
+  if (!optional && !nonoptional_check (dim, n))
+    return false;
+
+  return true;
+}
+
+
+/* If a coarray DIM parameter is a constant, make sure that it is greater than
+   zero and less than or equal to the corank of the given array.  */
+
+static bool
+dim_corank_check (gfc_expr *dim, gfc_expr *array)
+{
+  int corank;
+
+  gcc_assert (array->expr_type == EXPR_VARIABLE);
+
+  if (dim->expr_type != EXPR_CONSTANT)
+    return true;
+
+  if (array->ts.type == BT_CLASS)
+    return true;
+
+  corank = gfc_get_corank (array);
+
+  if (mpz_cmp_ui (dim->value.integer, 1) < 0
+      || mpz_cmp_ui (dim->value.integer, corank) > 0)
+    {
+      gfc_error ("%<dim%> argument of %qs intrinsic at %L is not a valid "
+		 "codimension index", gfc_current_intrinsic, &dim->where);
+
+      return false;
+    }
+
+  return true;
+}
+
+
+/* If a DIM parameter is a constant, make sure that it is greater than
+   zero and less than or equal to the rank of the given array.  If
+   allow_assumed is zero then dim must be less than the rank of the array
+   for assumed size arrays.  */
+
+static bool
+dim_rank_check (gfc_expr *dim, gfc_expr *array, int allow_assumed)
+{
+  gfc_array_ref *ar;
+  int rank;
+
+  if (dim == NULL)
+    return true;
+
+  if (dim->expr_type != EXPR_CONSTANT)
+    return true;
+
+  if (array->expr_type == EXPR_FUNCTION && array->value.function.isym
+      && array->value.function.isym->id == GFC_ISYM_SPREAD)
+    rank = array->rank + 1;
+  else
+    rank = array->rank;
+
+  /* Assumed-rank array.  */
+  if (rank == -1)
+    rank = GFC_MAX_DIMENSIONS;
+
+  if (array->expr_type == EXPR_VARIABLE)
+    {
+      ar = gfc_find_array_ref (array);
+      if (ar->as->type == AS_ASSUMED_SIZE
+	  && !allow_assumed
+	  && ar->type != AR_ELEMENT
+	  && ar->type != AR_SECTION)
+	rank--;
+    }
+
+  if (mpz_cmp_ui (dim->value.integer, 1) < 0
+      || mpz_cmp_ui (dim->value.integer, rank) > 0)
+    {
+      gfc_error ("%<dim%> argument of %qs intrinsic at %L is not a valid "
+		 "dimension index", gfc_current_intrinsic, &dim->where);
+
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Compare the size of a along dimension ai with the size of b along
+   dimension bi, returning 0 if they are known not to be identical,
+   and 1 if they are identical, or if this cannot be determined.  */
+
+static int
+identical_dimen_shape (gfc_expr *a, int ai, gfc_expr *b, int bi)
+{
+  mpz_t a_size, b_size;
+  int ret;
+
+  gcc_assert (a->rank > ai);
+  gcc_assert (b->rank > bi);
+
+  ret = 1;
+
+  if (gfc_array_dimen_size (a, ai, &a_size))
+    {
+      if (gfc_array_dimen_size (b, bi, &b_size))
+	{
+	  if (mpz_cmp (a_size, b_size) != 0)
+	    ret = 0;
+
+	  mpz_clear (b_size);
+	}
+      mpz_clear (a_size);
+    }
+  return ret;
+}
+
+/*  Calculate the length of a character variable, including substrings.
+    Strip away parentheses if necessary.  Return -1 if no length could
+    be determined.  */
+
+static long
+gfc_var_strlen (const gfc_expr *a)
+{
+  gfc_ref *ra;
+
+  while (a->expr_type == EXPR_OP && a->value.op.op == INTRINSIC_PARENTHESES)
+    a = a->value.op.op1;
+
+  for (ra = a->ref; ra != NULL && ra->type != REF_SUBSTRING; ra = ra->next)
+    ;
+
+  if (ra)
+    {
+      long start_a, end_a;
+
+      if (!ra->u.ss.end)
+	return -1;
+
+      if ((!ra->u.ss.start || ra->u.ss.start->expr_type == EXPR_CONSTANT)
+	  && ra->u.ss.end->expr_type == EXPR_CONSTANT)
+	{
+	  start_a = ra->u.ss.start ? mpz_get_si (ra->u.ss.start->value.integer)
+				   : 1;
+	  end_a = mpz_get_si (ra->u.ss.end->value.integer);
+	  return (end_a < start_a) ? 0 : end_a - start_a + 1;
+	}
+      else if (ra->u.ss.start
+	       && gfc_dep_compare_expr (ra->u.ss.start, ra->u.ss.end) == 0)
+	return 1;
+      else
+	return -1;
+    }
+
+  if (a->ts.u.cl && a->ts.u.cl->length
+      && a->ts.u.cl->length->expr_type == EXPR_CONSTANT)
+    return mpz_get_si (a->ts.u.cl->length->value.integer);
+  else if (a->expr_type == EXPR_CONSTANT
+	   && (a->ts.u.cl == NULL || a->ts.u.cl->length == NULL))
+    return a->value.character.length;
+  else
+    return -1;
+
+}
+
+/* Check whether two character expressions have the same length;
+   returns true if they have or if the length cannot be determined,
+   otherwise return false and raise a gfc_error.  */
+
+bool
+gfc_check_same_strlen (const gfc_expr *a, const gfc_expr *b, const char *name)
+{
+   long len_a, len_b;
+
+   len_a = gfc_var_strlen(a);
+   len_b = gfc_var_strlen(b);
+
+   if (len_a == -1 || len_b == -1 || len_a == len_b)
+     return true;
+   else
+     {
+       gfc_error ("Unequal character lengths (%ld/%ld) in %s at %L",
+		  len_a, len_b, name, &a->where);
+       return false;
+     }
+}
+
+
+/***** Check functions *****/
+
+/* Check subroutine suitable for intrinsics taking a real argument and
+   a kind argument for the result.  */
+
+static bool
+check_a_kind (gfc_expr *a, gfc_expr *kind, bt type)
+{
+  if (!type_check (a, 0, BT_REAL))
+    return false;
+  if (!kind_check (kind, 1, type))
+    return false;
+
+  return true;
+}
+
+
+/* Check subroutine suitable for ceiling, floor and nint.  */
+
+bool
+gfc_check_a_ikind (gfc_expr *a, gfc_expr *kind)
+{
+  return check_a_kind (a, kind, BT_INTEGER);
+}
+
+
+/* Check subroutine suitable for aint, anint.  */
+
+bool
+gfc_check_a_xkind (gfc_expr *a, gfc_expr *kind)
+{
+  return check_a_kind (a, kind, BT_REAL);
+}
+
+
+bool
+gfc_check_abs (gfc_expr *a)
+{
+  if (!numeric_check (a, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_achar (gfc_expr *a, gfc_expr *kind)
+{
+  if (!type_check (a, 0, BT_INTEGER))
+    return false;
+  if (!kind_check (kind, 1, BT_CHARACTER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_access_func (gfc_expr *name, gfc_expr *mode)
+{
+  if (!type_check (name, 0, BT_CHARACTER)
+      || !scalar_check (name, 0))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (mode, 1, BT_CHARACTER)
+      || !scalar_check (mode, 1))
+    return false;
+  if (!kind_value_check (mode, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_all_any (gfc_expr *mask, gfc_expr *dim)
+{
+  if (!logical_array_check (mask, 0))
+    return false;
+
+  if (!dim_check (dim, 1, false))
+    return false;
+
+  if (!dim_rank_check (dim, mask, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_allocated (gfc_expr *array)
+{
+  /* Tests on allocated components of coarrays need to detour the check to
+     argument of the _caf_get.  */
+  if (flag_coarray == GFC_FCOARRAY_LIB && array->expr_type == EXPR_FUNCTION
+      && array->value.function.isym
+      && array->value.function.isym->id == GFC_ISYM_CAF_GET)
+    {
+      array = array->value.function.actual->expr;
+      if (!array->ref)
+	return false;
+    }
+
+  if (!variable_check (array, 0, false))
+    return false;
+  if (!allocatable_check (array, 0))
+    return false;
+
+  return true;
+}
+
+
+/* Common check function where the first argument must be real or
+   integer and the second argument must be the same as the first.  */
+
+bool
+gfc_check_a_p (gfc_expr *a, gfc_expr *p)
+{
+  if (!int_or_real_check (a, 0))
+    return false;
+
+  if (a->ts.type != p->ts.type)
+    {
+      gfc_error ("%qs and %qs arguments of %qs intrinsic at %L must "
+		 "have the same type", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &p->where);
+      return false;
+    }
+
+  if (a->ts.kind != p->ts.kind)
+    {
+      if (!gfc_notify_std (GFC_STD_GNU, "Different type kinds at %L",
+			   &p->where))
+       return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_x_yd (gfc_expr *x, gfc_expr *y)
+{
+  if (!double_check (x, 0) || !double_check (y, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_associated (gfc_expr *pointer, gfc_expr *target)
+{
+  symbol_attribute attr1, attr2;
+  int i;
+  bool t;
+  locus *where;
+
+  where = &pointer->where;
+
+  if (pointer->expr_type == EXPR_NULL)
+    goto null_arg;
+
+  attr1 = gfc_expr_attr (pointer);
+
+  if (!attr1.pointer && !attr1.proc_pointer)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a POINTER",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &pointer->where);
+      return false;
+    }
+
+  /* F2008, C1242.  */
+  if (attr1.pointer && gfc_is_coindexed (pointer))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be "
+		 "coindexed", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &pointer->where);
+      return false;
+    }
+
+  /* Target argument is optional.  */
+  if (target == NULL)
+    return true;
+
+  where = &target->where;
+  if (target->expr_type == EXPR_NULL)
+    goto null_arg;
+
+  if (target->expr_type == EXPR_VARIABLE || target->expr_type == EXPR_FUNCTION)
+    attr2 = gfc_expr_attr (target);
+  else
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a pointer "
+		 "or target VARIABLE or FUNCTION",
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &target->where);
+      return false;
+    }
+
+  if (attr1.pointer && !attr2.pointer && !attr2.target)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a POINTER "
+		 "or a TARGET", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &target->where);
+      return false;
+    }
+
+  /* F2008, C1242.  */
+  if (attr1.pointer && gfc_is_coindexed (target))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be "
+		 "coindexed", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &target->where);
+      return false;
+    }
+
+  t = true;
+  if (!same_type_check (pointer, 0, target, 1))
+    t = false;
+  if (!rank_check (target, 0, pointer->rank))
+    t = false;
+  if (target->rank > 0)
+    {
+      for (i = 0; i < target->rank; i++)
+	if (target->ref->u.ar.dimen_type[i] == DIMEN_VECTOR)
+	  {
+	    gfc_error ("Array section with a vector subscript at %L shall not "
+		       "be the target of a pointer",
+		       &target->where);
+	    t = false;
+	    break;
+	  }
+    }
+  return t;
+
+null_arg:
+
+  gfc_error ("NULL pointer at %L is not permitted as actual argument "
+	     "of %qs intrinsic function", where, gfc_current_intrinsic);
+  return false;
+
+}
+
+
+bool
+gfc_check_atan_2 (gfc_expr *y, gfc_expr *x)
+{
+  /* gfc_notify_std would be a waste of time as the return value
+     is seemingly used only for the generic resolution.  The error
+     will be: Too many arguments.  */
+  if ((gfc_option.allow_std & GFC_STD_F2008) == 0)
+    return false;
+
+  return gfc_check_atan2 (y, x);
+}
+
+
+bool
+gfc_check_atan2 (gfc_expr *y, gfc_expr *x)
+{
+  if (!type_check (y, 0, BT_REAL))
+    return false;
+  if (!same_type_check (y, 0, x, 1))
+    return false;
+
+  return true;
+}
+
+
+static bool
+gfc_check_atomic (gfc_expr *atom, int atom_no, gfc_expr *value, int val_no,
+		  gfc_expr *stat, int stat_no)
+{
+  if (!scalar_check (atom, atom_no) || !scalar_check (value, val_no))
+    return false;
+
+  if (!(atom->ts.type == BT_INTEGER && atom->ts.kind == gfc_atomic_int_kind)
+      && !(atom->ts.type == BT_LOGICAL
+	   && atom->ts.kind == gfc_atomic_logical_kind))
+    {
+      gfc_error ("ATOM argument at %L to intrinsic function %s shall be an "
+		 "integer of ATOMIC_INT_KIND or a logical of "
+		 "ATOMIC_LOGICAL_KIND", &atom->where, gfc_current_intrinsic);
+      return false;
+    }
+
+  if (!gfc_is_coarray (atom) && !gfc_is_coindexed (atom))
+    {
+      gfc_error ("ATOM argument at %L of the %s intrinsic function shall be a "
+		 "coarray or coindexed", &atom->where, gfc_current_intrinsic);
+      return false;
+    }
+
+  if (atom->ts.type != value->ts.type)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall have the same "
+		 "type as %qs at %L", gfc_current_intrinsic_arg[val_no]->name,
+		 gfc_current_intrinsic, &value->where,
+		 gfc_current_intrinsic_arg[atom_no]->name, &atom->where);
+      return false;
+    }
+
+  if (stat != NULL)
+    {
+      if (!type_check (stat, stat_no, BT_INTEGER))
+	return false;
+      if (!scalar_check (stat, stat_no))
+	return false;
+      if (!variable_check (stat, stat_no, false))
+	return false;
+      if (!kind_value_check (stat, stat_no, gfc_default_integer_kind))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008_TS, "STAT= argument to %s at %L",
+			   gfc_current_intrinsic, &stat->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_atomic_def (gfc_expr *atom, gfc_expr *value, gfc_expr *stat)
+{
+  if (atom->expr_type == EXPR_FUNCTION
+      && atom->value.function.isym
+      && atom->value.function.isym->id == GFC_ISYM_CAF_GET)
+    atom = atom->value.function.actual->expr;
+
+  if (!gfc_check_vardef_context (atom, false, false, false, NULL))
+    {
+      gfc_error ("ATOM argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &atom->where);
+      return false;
+    }
+
+  return gfc_check_atomic (atom, 0, value, 1, stat, 2);
+}
+
+
+bool
+gfc_check_atomic_op (gfc_expr *atom, gfc_expr *value, gfc_expr *stat)
+{
+  if (atom->ts.type != BT_INTEGER || atom->ts.kind != gfc_atomic_int_kind)
+    {
+      gfc_error ("ATOM argument at %L to intrinsic function %s shall be an "
+		 "integer of ATOMIC_INT_KIND", &atom->where,
+		 gfc_current_intrinsic);
+      return false;
+    }
+
+  return gfc_check_atomic_def (atom, value, stat);
+}
+
+
+bool
+gfc_check_atomic_ref (gfc_expr *value, gfc_expr *atom, gfc_expr *stat)
+{
+  if (atom->expr_type == EXPR_FUNCTION
+      && atom->value.function.isym
+      && atom->value.function.isym->id == GFC_ISYM_CAF_GET)
+    atom = atom->value.function.actual->expr;
+
+  if (!gfc_check_vardef_context (value, false, false, false, NULL))
+    {
+      gfc_error ("VALUE argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &value->where);
+      return false;
+    }
+
+  return gfc_check_atomic (atom, 1, value, 0, stat, 2);
+}
+
+
+bool
+gfc_check_image_status (gfc_expr *image, gfc_expr *team)
+{
+  /* IMAGE has to be a positive, scalar integer.  */
+  if (!type_check (image, 0, BT_INTEGER) || !scalar_check (image, 0)
+      || !positive_check (0, image))
+    return false;
+
+  if (team)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L not yet supported",
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &team->where);
+      return false;
+    }
+  return true;
+}
+
+
+bool
+gfc_check_failed_or_stopped_images (gfc_expr *team, gfc_expr *kind)
+{
+  if (team)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L not yet supported",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &team->where);
+      return false;
+    }
+
+  if (kind)
+    {
+      int k;
+
+      if (!type_check (kind, 1, BT_INTEGER) || !scalar_check (kind, 1)
+	  || !positive_check (1, kind))
+	return false;
+
+      /* Get the kind, reporting error on non-constant or overflow.  */
+      gfc_current_locus = kind->where;
+      if (gfc_extract_int (kind, &k, 1))
+	return false;
+      if (gfc_validate_kind (BT_INTEGER, k, true) == -1)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L shall specify a "
+		     "valid integer kind", gfc_current_intrinsic_arg[1]->name,
+		     gfc_current_intrinsic, &kind->where);
+	  return false;
+	}
+    }
+  return true;
+}
+
+
+bool
+gfc_check_atomic_cas (gfc_expr *atom, gfc_expr *old, gfc_expr *compare,
+		      gfc_expr *new_val,  gfc_expr *stat)
+{
+  if (atom->expr_type == EXPR_FUNCTION
+      && atom->value.function.isym
+      && atom->value.function.isym->id == GFC_ISYM_CAF_GET)
+    atom = atom->value.function.actual->expr;
+
+  if (!gfc_check_atomic (atom, 0, new_val, 3, stat, 4))
+    return false;
+
+  if (!scalar_check (old, 1) || !scalar_check (compare, 2))
+    return false;
+
+  if (!same_type_check (atom, 0, old, 1))
+    return false;
+
+  if (!same_type_check (atom, 0, compare, 2))
+    return false;
+
+  if (!gfc_check_vardef_context (atom, false, false, false, NULL))
+    {
+      gfc_error ("ATOM argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &atom->where);
+      return false;
+    }
+
+  if (!gfc_check_vardef_context (old, false, false, false, NULL))
+    {
+      gfc_error ("OLD argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &old->where);
+      return false;
+    }
+
+  return true;
+}
+
+bool
+gfc_check_event_query (gfc_expr *event, gfc_expr *count, gfc_expr *stat)
+{
+  if (event->ts.type != BT_DERIVED
+      || event->ts.u.derived->from_intmod != INTMOD_ISO_FORTRAN_ENV
+      || event->ts.u.derived->intmod_sym_id != ISOFORTRAN_EVENT_TYPE)
+    {
+      gfc_error ("EVENT argument at %L to the intrinsic EVENT_QUERY "
+		 "shall be of type EVENT_TYPE", &event->where);
+      return false;
+    }
+
+  if (!scalar_check (event, 0))
+    return false;
+
+  if (!gfc_check_vardef_context (count, false, false, false, NULL))
+    {
+      gfc_error ("COUNT argument of the EVENT_QUERY intrinsic function at %L "
+		 "shall be definable", &count->where);
+      return false;
+    }
+
+  if (!type_check (count, 1, BT_INTEGER))
+    return false;
+
+  int i = gfc_validate_kind (BT_INTEGER, count->ts.kind, false);
+  int j = gfc_validate_kind (BT_INTEGER, gfc_default_integer_kind, false);
+
+  if (gfc_integer_kinds[i].range < gfc_integer_kinds[j].range)
+    {
+      gfc_error ("COUNT argument of the EVENT_QUERY intrinsic function at %L "
+		 "shall have at least the range of the default integer",
+		 &count->where);
+      return false;
+    }
+
+  if (stat != NULL)
+    {
+      if (!type_check (stat, 2, BT_INTEGER))
+	return false;
+      if (!scalar_check (stat, 2))
+	return false;
+      if (!variable_check (stat, 2, false))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008_TS, "STAT= argument to %s at %L",
+			   gfc_current_intrinsic, &stat->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_atomic_fetch_op (gfc_expr *atom, gfc_expr *value, gfc_expr *old,
+			   gfc_expr *stat)
+{
+  if (atom->expr_type == EXPR_FUNCTION
+      && atom->value.function.isym
+      && atom->value.function.isym->id == GFC_ISYM_CAF_GET)
+    atom = atom->value.function.actual->expr;
+
+  if (atom->ts.type != BT_INTEGER || atom->ts.kind != gfc_atomic_int_kind)
+    {
+      gfc_error ("ATOM argument at %L to intrinsic function %s shall be an "
+		 "integer of ATOMIC_INT_KIND", &atom->where,
+		 gfc_current_intrinsic);
+      return false;
+    }
+
+  if (!gfc_check_atomic (atom, 0, value, 1, stat, 3))
+    return false;
+
+  if (!scalar_check (old, 2))
+    return false;
+
+  if (!same_type_check (atom, 0, old, 2))
+    return false;
+
+  if (!gfc_check_vardef_context (atom, false, false, false, NULL))
+    {
+      gfc_error ("ATOM argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &atom->where);
+      return false;
+    }
+
+  if (!gfc_check_vardef_context (old, false, false, false, NULL))
+    {
+      gfc_error ("OLD argument of the %s intrinsic function at %L shall be "
+		 "definable", gfc_current_intrinsic, &old->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* BESJN and BESYN functions.  */
+
+bool
+gfc_check_besn (gfc_expr *n, gfc_expr *x)
+{
+  if (!type_check (n, 0, BT_INTEGER))
+    return false;
+  if (n->expr_type == EXPR_CONSTANT)
+    {
+      int i;
+      gfc_extract_int (n, &i);
+      if (i < 0 && !gfc_notify_std (GFC_STD_GNU, "Negative argument "
+				    "N at %L", &n->where))
+	return false;
+    }
+
+  if (!type_check (x, 1, BT_REAL))
+    return false;
+
+  return true;
+}
+
+
+/* Transformational version of the Bessel JN and YN functions.  */
+
+bool
+gfc_check_bessel_n2 (gfc_expr *n1, gfc_expr *n2, gfc_expr *x)
+{
+  if (!type_check (n1, 0, BT_INTEGER))
+    return false;
+  if (!scalar_check (n1, 0))
+    return false;
+  if (!nonnegative_check ("N1", n1))
+    return false;
+
+  if (!type_check (n2, 1, BT_INTEGER))
+    return false;
+  if (!scalar_check (n2, 1))
+    return false;
+  if (!nonnegative_check ("N2", n2))
+    return false;
+
+  if (!type_check (x, 2, BT_REAL))
+    return false;
+  if (!scalar_check (x, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_bge_bgt_ble_blt (gfc_expr *i, gfc_expr *j)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_bitfcn (gfc_expr *i, gfc_expr *pos)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (pos, 1, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("pos", pos))
+    return false;
+
+  if (!less_than_bitsize1 ("i", i, "pos", pos, false))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_char (gfc_expr *i, gfc_expr *kind)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+  if (!kind_check (kind, 1, BT_CHARACTER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_chdir (gfc_expr *dir)
+{
+  if (!type_check (dir, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (dir, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_chdir_sub (gfc_expr *dir, gfc_expr *status)
+{
+  if (!type_check (dir, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (dir, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 1, BT_INTEGER))
+    return false;
+  if (!scalar_check (status, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_chmod (gfc_expr *name, gfc_expr *mode)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (mode, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (mode, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_chmod_sub (gfc_expr *name, gfc_expr *mode, gfc_expr *status)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (mode, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (mode, 1, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_cmplx (gfc_expr *x, gfc_expr *y, gfc_expr *kind)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  if (y != NULL)
+    {
+      if (!numeric_check (y, 1))
+	return false;
+
+      if (x->ts.type == BT_COMPLEX)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must not be "
+		     "present if %<x%> is COMPLEX",
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &y->where);
+	  return false;
+	}
+
+      if (y->ts.type == BT_COMPLEX)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must have a type "
+		     "of either REAL or INTEGER",
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &y->where);
+	  return false;
+	}
+
+    }
+
+  if (!kind_check (kind, 2, BT_COMPLEX))
+    return false;
+
+  if (!kind && warn_conversion
+      && x->ts.type == BT_REAL && x->ts.kind > gfc_default_real_kind)
+    gfc_warning_now (OPT_Wconversion, "Conversion from %s to default-kind "
+		     "COMPLEX(%d) at %L might lose precision, consider using "
+		     "the KIND argument", gfc_typename (&x->ts),
+		     gfc_default_real_kind, &x->where);
+  else if (y && !kind && warn_conversion
+	   && y->ts.type == BT_REAL && y->ts.kind > gfc_default_real_kind)
+    gfc_warning_now (OPT_Wconversion, "Conversion from %s to default-kind "
+		     "COMPLEX(%d) at %L might lose precision, consider using "
+		     "the KIND argument", gfc_typename (&y->ts),
+		     gfc_default_real_kind, &y->where);
+  return true;
+}
+
+
+static bool
+check_co_collective (gfc_expr *a, gfc_expr *image_idx, gfc_expr *stat,
+		    gfc_expr *errmsg, bool co_reduce)
+{
+  if (!variable_check (a, 0, false))
+    return false;
+
+  if (!gfc_check_vardef_context (a, false, false, false, "argument 'A' with "
+				 "INTENT(INOUT)"))
+    return false;
+
+  /* Fortran 2008, 12.5.2.4, paragraph 18.  */
+  if (gfc_has_vector_subscript (a))
+    {
+      gfc_error ("Argument %<A%> with INTENT(INOUT) at %L of the intrinsic "
+		 "subroutine %s shall not have a vector subscript",
+		 &a->where, gfc_current_intrinsic);
+      return false;
+    }
+
+  if (gfc_is_coindexed (a))
+    {
+      gfc_error ("The A argument at %L to the intrinsic %s shall not be "
+		 "coindexed", &a->where, gfc_current_intrinsic);
+      return false;
+    }
+
+  if (image_idx != NULL)
+    {
+      if (!type_check (image_idx, co_reduce ? 2 : 1, BT_INTEGER))
+	return false;
+      if (!scalar_check (image_idx, co_reduce ? 2 : 1))
+	return false;
+    }
+
+  if (stat != NULL)
+    {
+      if (!type_check (stat, co_reduce ? 3 : 2, BT_INTEGER))
+	return false;
+      if (!scalar_check (stat, co_reduce ? 3 : 2))
+	return false;
+      if (!variable_check (stat, co_reduce ? 3 : 2, false))
+	return false;
+      if (stat->ts.kind != 4)
+	{
+	  gfc_error ("The stat= argument at %L must be a kind=4 integer "
+		     "variable", &stat->where);
+	  return false;
+	}
+    }
+
+  if (errmsg != NULL)
+    {
+      if (!type_check (errmsg, co_reduce ? 4 : 3, BT_CHARACTER))
+	return false;
+      if (!scalar_check (errmsg, co_reduce ? 4 : 3))
+	return false;
+      if (!variable_check (errmsg, co_reduce ? 4 : 3, false))
+	return false;
+      if (errmsg->ts.kind != 1)
+	{
+	  gfc_error ("The errmsg= argument at %L must be a default-kind "
+		     "character variable", &errmsg->where);
+	  return false;
+	}
+    }
+
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %L, use %<-fcoarray=%> to enable",
+		       &a->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_co_broadcast (gfc_expr *a, gfc_expr *source_image, gfc_expr *stat,
+			gfc_expr *errmsg)
+{
+  if (a->ts.type == BT_CLASS || gfc_expr_attr (a).alloc_comp)
+    {
+      gfc_error ("Support for the A argument at %L which is polymorphic A "
+		 "argument or has allocatable components is not yet "
+		 "implemented", &a->where);
+      return false;
+    }
+  return check_co_collective (a, source_image, stat, errmsg, false);
+}
+
+
+bool
+gfc_check_co_reduce (gfc_expr *a, gfc_expr *op, gfc_expr *result_image,
+		     gfc_expr *stat, gfc_expr *errmsg)
+{
+  symbol_attribute attr;
+  gfc_formal_arglist *formal;
+  gfc_symbol *sym;
+
+  if (a->ts.type == BT_CLASS)
+    {
+      gfc_error ("The A argument at %L of CO_REDUCE shall not be polymorphic",
+		 &a->where);
+      return false;
+    }
+
+  if (gfc_expr_attr (a).alloc_comp)
+    {
+      gfc_error ("Support for the A argument at %L with allocatable components"
+                 " is not yet implemented", &a->where);
+      return false;
+    }
+
+  if (!check_co_collective (a, result_image, stat, errmsg, true))
+    return false;
+
+  if (!gfc_resolve_expr (op))
+    return false;
+
+  attr = gfc_expr_attr (op);
+  if (!attr.pure || !attr.function)
+    {
+      gfc_error ("OPERATOR argument at %L must be a PURE function",
+		 &op->where);
+      return false;
+    }
+
+  if (attr.intrinsic)
+    {
+      /* None of the intrinsics fulfills the criteria of taking two arguments,
+	 returning the same type and kind as the arguments and being permitted
+	 as actual argument.  */
+      gfc_error ("Intrinsic function %s at %L is not permitted for CO_REDUCE",
+		 op->symtree->n.sym->name, &op->where);
+      return false;
+    }
+
+  if (gfc_is_proc_ptr_comp (op))
+    {
+      gfc_component *comp = gfc_get_proc_ptr_comp (op);
+      sym = comp->ts.interface;
+    }
+  else
+    sym = op->symtree->n.sym;
+
+  formal = sym->formal;
+
+  if (!formal || !formal->next || formal->next->next)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall have two "
+		 "arguments", &op->where);
+      return false;
+    }
+
+  if (sym->result->ts.type == BT_UNKNOWN)
+    gfc_set_default_type (sym->result, 0, NULL);
+
+  if (!gfc_compare_types (&a->ts, &sym->result->ts))
+    {
+      gfc_error ("A argument at %L has type %s but the function passed as "
+		 "OPERATOR at %L returns %s",
+		 &a->where, gfc_typename (&a->ts), &op->where,
+		 gfc_typename (&sym->result->ts));
+      return false;
+    }
+  if (!gfc_compare_types (&a->ts, &formal->sym->ts)
+      || !gfc_compare_types (&a->ts, &formal->next->sym->ts))
+    {
+      gfc_error ("The function passed as OPERATOR at %L has arguments of type "
+		 "%s and %s but shall have type %s", &op->where,
+		 gfc_typename (&formal->sym->ts),
+		 gfc_typename (&formal->next->sym->ts), gfc_typename (&a->ts));
+      return false;
+    }
+  if (op->rank || attr.allocatable || attr.pointer || formal->sym->as
+      || formal->next->sym->as || formal->sym->attr.allocatable
+      || formal->next->sym->attr.allocatable || formal->sym->attr.pointer
+      || formal->next->sym->attr.pointer)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall have scalar "
+		 "nonallocatable nonpointer arguments and return a "
+		 "nonallocatable nonpointer scalar", &op->where);
+      return false;
+    }
+
+  if (formal->sym->attr.value != formal->next->sym->attr.value)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall have the VALUE "
+		 "attribute either for none or both arguments", &op->where);
+      return false;
+    }
+
+  if (formal->sym->attr.target != formal->next->sym->attr.target)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall have the TARGET "
+		 "attribute either for none or both arguments", &op->where);
+      return false;
+    }
+
+  if (formal->sym->attr.asynchronous != formal->next->sym->attr.asynchronous)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall have the "
+		 "ASYNCHRONOUS attribute either for none or both arguments",
+		 &op->where);
+      return false;
+    }
+
+  if (formal->sym->attr.optional || formal->next->sym->attr.optional)
+    {
+      gfc_error ("The function passed as OPERATOR at %L shall not have the "
+		 "OPTIONAL attribute for either of the arguments", &op->where);
+      return false;
+    }
+
+  if (a->ts.type == BT_CHARACTER)
+    {
+      gfc_charlen *cl;
+      unsigned long actual_size, formal_size1, formal_size2, result_size;
+
+      cl = a->ts.u.cl;
+      actual_size = cl && cl->length && cl->length->expr_type == EXPR_CONSTANT
+		     ? mpz_get_ui (cl->length->value.integer) : 0;
+
+      cl = formal->sym->ts.u.cl;
+      formal_size1 = cl && cl->length && cl->length->expr_type == EXPR_CONSTANT
+		     ? mpz_get_ui (cl->length->value.integer) : 0;
+
+      cl = formal->next->sym->ts.u.cl;
+      formal_size2 = cl && cl->length && cl->length->expr_type == EXPR_CONSTANT
+		     ? mpz_get_ui (cl->length->value.integer) : 0;
+
+      cl = sym->ts.u.cl;
+      result_size = cl && cl->length && cl->length->expr_type == EXPR_CONSTANT
+		    ? mpz_get_ui (cl->length->value.integer) : 0;
+
+      if (actual_size
+	  && ((formal_size1 && actual_size != formal_size1)
+	       || (formal_size2 && actual_size != formal_size2)))
+	{
+	  gfc_error ("The character length of the A argument at %L and of the "
+		     "arguments of the OPERATOR at %L shall be the same",
+		     &a->where, &op->where);
+	  return false;
+	}
+      if (actual_size && result_size && actual_size != result_size)
+	{
+	  gfc_error ("The character length of the A argument at %L and of the "
+		     "function result of the OPERATOR at %L shall be the same",
+		     &a->where, &op->where);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_co_minmax (gfc_expr *a, gfc_expr *result_image, gfc_expr *stat,
+		     gfc_expr *errmsg)
+{
+  if (a->ts.type != BT_INTEGER && a->ts.type != BT_REAL
+      && a->ts.type != BT_CHARACTER)
+    {
+       gfc_error ("%qs argument of %qs intrinsic at %L shall be of type "
+		  "integer, real or character",
+		  gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		  &a->where);
+       return false;
+    }
+  return check_co_collective (a, result_image, stat, errmsg, false);
+}
+
+
+bool
+gfc_check_co_sum (gfc_expr *a, gfc_expr *result_image, gfc_expr *stat,
+		  gfc_expr *errmsg)
+{
+  if (!numeric_check (a, 0))
+    return false;
+  return check_co_collective (a, result_image, stat, errmsg, false);
+}
+
+
+bool
+gfc_check_complex (gfc_expr *x, gfc_expr *y)
+{
+  if (!int_or_real_check (x, 0))
+    return false;
+  if (!scalar_check (x, 0))
+    return false;
+
+  if (!int_or_real_check (y, 1))
+    return false;
+  if (!scalar_check (y, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_count (gfc_expr *mask, gfc_expr *dim, gfc_expr *kind)
+{
+  if (!logical_array_check (mask, 0))
+    return false;
+  if (!dim_check (dim, 1, false))
+    return false;
+  if (!dim_rank_check (dim, mask, 0))
+    return false;
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_cshift (gfc_expr *array, gfc_expr *shift, gfc_expr *dim)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!type_check (shift, 1, BT_INTEGER))
+    return false;
+
+  if (!dim_check (dim, 2, true))
+    return false;
+
+  if (!dim_rank_check (dim, array, false))
+    return false;
+
+  if (array->rank == 1 || shift->rank == 0)
+    {
+      if (!scalar_check (shift, 1))
+	return false;
+    }
+  else if (shift->rank == array->rank - 1)
+    {
+      int d;
+      if (!dim)
+	d = 1;
+      else if (dim->expr_type == EXPR_CONSTANT)
+	gfc_extract_int (dim, &d);
+      else
+	d = -1;
+
+      if (d > 0)
+	{
+	  int i, j;
+	  for (i = 0, j = 0; i < array->rank; i++)
+	    if (i != d - 1)
+	      {
+		if (!identical_dimen_shape (array, i, shift, j))
+		  {
+		    gfc_error ("%qs argument of %qs intrinsic at %L has "
+			       "invalid shape in dimension %d (%ld/%ld)",
+			       gfc_current_intrinsic_arg[1]->name,
+			       gfc_current_intrinsic, &shift->where, i + 1,
+			       mpz_get_si (array->shape[i]),
+			       mpz_get_si (shift->shape[j]));
+		    return false;
+		  }
+
+		j += 1;
+	      }
+	}
+    }
+  else
+    {
+      gfc_error ("%qs argument of intrinsic %qs at %L of must have rank "
+		 "%d or be a scalar", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &shift->where, array->rank - 1);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_ctime (gfc_expr *time)
+{
+  if (!scalar_check (time, 0))
+    return false;
+
+  if (!type_check (time, 0, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool gfc_check_datan2 (gfc_expr *y, gfc_expr *x)
+{
+  if (!double_check (y, 0) || !double_check (x, 1))
+    return false;
+
+  return true;
+}
+
+bool
+gfc_check_dcmplx (gfc_expr *x, gfc_expr *y)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  if (y != NULL)
+    {
+      if (!numeric_check (y, 1))
+	return false;
+
+      if (x->ts.type == BT_COMPLEX)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must not be "
+		     "present if %<x%> is COMPLEX",
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &y->where);
+	  return false;
+	}
+
+      if (y->ts.type == BT_COMPLEX)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must have a type "
+		     "of either REAL or INTEGER",
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &y->where);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_dble (gfc_expr *x)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_digits (gfc_expr *x)
+{
+  if (!int_or_real_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_dot_product (gfc_expr *vector_a, gfc_expr *vector_b)
+{
+  switch (vector_a->ts.type)
+    {
+    case BT_LOGICAL:
+      if (!type_check (vector_b, 1, BT_LOGICAL))
+	return false;
+      break;
+
+    case BT_INTEGER:
+    case BT_REAL:
+    case BT_COMPLEX:
+      if (!numeric_check (vector_b, 1))
+	return false;
+      break;
+
+    default:
+      gfc_error ("%qs argument of %qs intrinsic at %L must be numeric "
+		 "or LOGICAL", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &vector_a->where);
+      return false;
+    }
+
+  if (!rank_check (vector_a, 0, 1))
+    return false;
+
+  if (!rank_check (vector_b, 1, 1))
+    return false;
+
+  if (! identical_dimen_shape (vector_a, 0, vector_b, 0))
+    {
+      gfc_error ("Different shape for arguments %qs and %qs at %L for "
+		 "intrinsic %<dot_product%>",
+		 gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic_arg[1]->name, &vector_a->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_dprod (gfc_expr *x, gfc_expr *y)
+{
+  if (!type_check (x, 0, BT_REAL)
+      || !type_check (y, 1, BT_REAL))
+    return false;
+
+  if (x->ts.kind != gfc_default_real_kind)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be default "
+		 "real", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &x->where);
+      return false;
+    }
+
+  if (y->ts.kind != gfc_default_real_kind)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be default "
+		 "real", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &y->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_dshift (gfc_expr *i, gfc_expr *j, gfc_expr *shift)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  if (i->is_boz && j->is_boz)
+    {
+      gfc_error ("%<I%> at %L and %<J%>' at %L cannot both be BOZ literal "
+		   "constants", &i->where, &j->where);
+      return false;
+    }
+
+  if (!i->is_boz && !j->is_boz && !same_type_check (i, 0, j, 1))
+    return false;
+
+  if (!type_check (shift, 2, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("SHIFT", shift))
+    return false;
+
+  if (i->is_boz)
+    {
+      if (!less_than_bitsize1 ("J", j, "SHIFT", shift, true))
+    	return false;
+      i->ts.kind = j->ts.kind;
+    }
+  else
+    {
+      if (!less_than_bitsize1 ("I", i, "SHIFT", shift, true))
+    	return false;
+      j->ts.kind = i->ts.kind;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_eoshift (gfc_expr *array, gfc_expr *shift, gfc_expr *boundary,
+		   gfc_expr *dim)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!type_check (shift, 1, BT_INTEGER))
+    return false;
+
+  if (!dim_check (dim, 3, true))
+    return false;
+
+  if (!dim_rank_check (dim, array, false))
+    return false;
+
+  if (array->rank == 1 || shift->rank == 0)
+    {
+      if (!scalar_check (shift, 1))
+	return false;
+    }
+  else if (shift->rank == array->rank - 1)
+    {
+      int d;
+      if (!dim)
+	d = 1;
+      else if (dim->expr_type == EXPR_CONSTANT)
+	gfc_extract_int (dim, &d);
+      else
+	d = -1;
+
+      if (d > 0)
+	{
+	  int i, j;
+	  for (i = 0, j = 0; i < array->rank; i++)
+	    if (i != d - 1)
+	      {
+		if (!identical_dimen_shape (array, i, shift, j))
+		  {
+		    gfc_error ("%qs argument of %qs intrinsic at %L has "
+			       "invalid shape in dimension %d (%ld/%ld)",
+			       gfc_current_intrinsic_arg[1]->name,
+			       gfc_current_intrinsic, &shift->where, i + 1,
+			       mpz_get_si (array->shape[i]),
+			       mpz_get_si (shift->shape[j]));
+		    return false;
+		  }
+
+		j += 1;
+	      }
+	}
+    }
+  else
+    {
+      gfc_error ("%qs argument of intrinsic %qs at %L of must have rank "
+		 "%d or be a scalar", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &shift->where, array->rank - 1);
+      return false;
+    }
+
+  if (boundary != NULL)
+    {
+      if (!same_type_check (array, 0, boundary, 2))
+	return false;
+
+      if (array->rank == 1 || boundary->rank == 0)
+	{
+	  if (!scalar_check (boundary, 2))
+	    return false;
+	}
+      else if (boundary->rank == array->rank - 1)
+	{
+	  if (!gfc_check_conformance (shift, boundary,
+				      "arguments '%s' and '%s' for "
+				      "intrinsic %s",
+				      gfc_current_intrinsic_arg[1]->name,
+				      gfc_current_intrinsic_arg[2]->name,
+				      gfc_current_intrinsic))
+	    return false;
+	}
+      else
+	{
+	  gfc_error ("%qs argument of intrinsic %qs at %L of must have "
+		     "rank %d or be a scalar",
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &shift->where, array->rank - 1);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+bool
+gfc_check_float (gfc_expr *a)
+{
+  if (!type_check (a, 0, BT_INTEGER))
+    return false;
+
+  if ((a->ts.kind != gfc_default_integer_kind)
+      && !gfc_notify_std (GFC_STD_GNU, "non-default INTEGER "
+			  "kind argument to %s intrinsic at %L",
+			  gfc_current_intrinsic, &a->where))
+    return false;
+
+  return true;
+}
+
+/* A single complex argument.  */
+
+bool
+gfc_check_fn_c (gfc_expr *a)
+{
+  if (!type_check (a, 0, BT_COMPLEX))
+    return false;
+
+  return true;
+}
+
+
+/* A single real argument.  */
+
+bool
+gfc_check_fn_r (gfc_expr *a)
+{
+  if (!type_check (a, 0, BT_REAL))
+    return false;
+
+  return true;
+}
+
+/* A single double argument.  */
+
+bool
+gfc_check_fn_d (gfc_expr *a)
+{
+  if (!double_check (a, 0))
+    return false;
+
+  return true;
+}
+
+/* A single real or complex argument.  */
+
+bool
+gfc_check_fn_rc (gfc_expr *a)
+{
+  if (!real_or_complex_check (a, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fn_rc2008 (gfc_expr *a)
+{
+  if (!real_or_complex_check (a, 0))
+    return false;
+
+  if (a->ts.type == BT_COMPLEX
+      && !gfc_notify_std (GFC_STD_F2008, "COMPLEX argument %qs "
+			  "of %qs intrinsic at %L",
+			  gfc_current_intrinsic_arg[0]->name,
+			  gfc_current_intrinsic, &a->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fnum (gfc_expr *unit)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_huge (gfc_expr *x)
+{
+  if (!int_or_real_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_hypot (gfc_expr *x, gfc_expr *y)
+{
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+  if (!same_type_check (x, 0, y, 1))
+    return false;
+
+  return true;
+}
+
+
+/* Check that the single argument is an integer.  */
+
+bool
+gfc_check_i (gfc_expr *i)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_iand (gfc_expr *i, gfc_expr *j)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  if (i->ts.kind != j->ts.kind)
+    {
+      if (!gfc_notify_std (GFC_STD_GNU, "Different type kinds at %L",
+			   &i->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_ibits (gfc_expr *i, gfc_expr *pos, gfc_expr *len)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (pos, 1, BT_INTEGER))
+    return false;
+
+  if (!type_check (len, 2, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("pos", pos))
+    return false;
+
+  if (!nonnegative_check ("len", len))
+    return false;
+
+  if (!less_than_bitsize2 ("i", i, "pos", pos, "len", len))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ichar_iachar (gfc_expr *c, gfc_expr *kind)
+{
+  int i;
+
+  if (!type_check (c, 0, BT_CHARACTER))
+    return false;
+
+  if (!kind_check (kind, 1, BT_INTEGER))
+    return false;
+
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  if (c->expr_type == EXPR_VARIABLE || c->expr_type == EXPR_SUBSTRING)
+    {
+      gfc_expr *start;
+      gfc_expr *end;
+      gfc_ref *ref;
+
+      /* Substring references don't have the charlength set.  */
+      ref = c->ref;
+      while (ref && ref->type != REF_SUBSTRING)
+	ref = ref->next;
+
+      gcc_assert (ref == NULL || ref->type == REF_SUBSTRING);
+
+      if (!ref)
+	{
+	  /* Check that the argument is length one.  Non-constant lengths
+	     can't be checked here, so assume they are ok.  */
+	  if (c->ts.u.cl && c->ts.u.cl->length)
+	    {
+	      /* If we already have a length for this expression then use it.  */
+	      if (c->ts.u.cl->length->expr_type != EXPR_CONSTANT)
+		return true;
+	      i = mpz_get_si (c->ts.u.cl->length->value.integer);
+	    }
+	  else
+	    return true;
+	}
+      else
+	{
+	  start = ref->u.ss.start;
+	  end = ref->u.ss.end;
+
+	  gcc_assert (start);
+	  if (end == NULL || end->expr_type != EXPR_CONSTANT
+	      || start->expr_type != EXPR_CONSTANT)
+	    return true;
+
+	  i = mpz_get_si (end->value.integer) + 1
+	    - mpz_get_si (start->value.integer);
+	}
+    }
+  else
+    return true;
+
+  if (i != 1)
+    {
+      gfc_error ("Argument of %s at %L must be of length one",
+		 gfc_current_intrinsic, &c->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_idnint (gfc_expr *a)
+{
+  if (!double_check (a, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ieor (gfc_expr *i, gfc_expr *j)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  if (i->ts.kind != j->ts.kind)
+    {
+      if (!gfc_notify_std (GFC_STD_GNU, "Different type kinds at %L",
+			   &i->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_index (gfc_expr *string, gfc_expr *substring, gfc_expr *back,
+		 gfc_expr *kind)
+{
+  if (!type_check (string, 0, BT_CHARACTER)
+      || !type_check (substring, 1, BT_CHARACTER))
+    return false;
+
+  if (back != NULL && !type_check (back, 2, BT_LOGICAL))
+    return false;
+
+  if (!kind_check (kind, 3, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  if (string->ts.kind != substring->ts.kind)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be the same "
+		 "kind as %qs", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &substring->where,
+		 gfc_current_intrinsic_arg[0]->name);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_int (gfc_expr *x, gfc_expr *kind)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  if (!kind_check (kind, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_intconv (gfc_expr *x)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ior (gfc_expr *i, gfc_expr *j)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  if (i->ts.kind != j->ts.kind)
+    {
+      if (!gfc_notify_std (GFC_STD_GNU, "Different type kinds at %L",
+			   &i->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_ishft (gfc_expr *i, gfc_expr *shift)
+{
+  if (!type_check (i, 0, BT_INTEGER)
+      || !type_check (shift, 1, BT_INTEGER))
+    return false;
+
+  if (!less_than_bitsize1 ("I", i, NULL, shift, true))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ishftc (gfc_expr *i, gfc_expr *shift, gfc_expr *size)
+{
+  if (!type_check (i, 0, BT_INTEGER)
+      || !type_check (shift, 1, BT_INTEGER))
+    return false;
+
+  if (size != NULL)
+    {
+      int i2, i3;
+
+      if (!type_check (size, 2, BT_INTEGER))
+	return false;
+
+      if (!less_than_bitsize1 ("I", i, "SIZE", size, true))
+	return false;
+
+      if (size->expr_type == EXPR_CONSTANT)
+	{
+	  gfc_extract_int (size, &i3);
+	  if (i3 <= 0)
+	    {
+	      gfc_error ("SIZE at %L must be positive", &size->where);
+	      return false;
+	    }
+
+	  if (shift->expr_type == EXPR_CONSTANT)
+	    {
+	      gfc_extract_int (shift, &i2);
+	      if (i2 < 0)
+		i2 = -i2;
+
+	      if (i2 > i3)
+		{
+		  gfc_error ("The absolute value of SHIFT at %L must be less "
+			     "than or equal to SIZE at %L", &shift->where,
+			     &size->where);
+		  return false;
+		}
+	     }
+	}
+    }
+  else if (!less_than_bitsize1 ("I", i, NULL, shift, true))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_kill (gfc_expr *pid, gfc_expr *sig)
+{
+  if (!type_check (pid, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (sig, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_kill_sub (gfc_expr *pid, gfc_expr *sig, gfc_expr *status)
+{
+  if (!type_check (pid, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (pid, 0))
+    return false;
+
+  if (!type_check (sig, 1, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (sig, 1))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_kind (gfc_expr *x)
+{
+  if (gfc_bt_struct (x->ts.type) || x->ts.type == BT_CLASS)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be of "
+		 "intrinsic type", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &x->where);
+      return false;
+    }
+  if (x->ts.type == BT_PROCEDURE)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a data entity",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &x->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_lbound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!dim_check (dim, 1, false))
+    return false;
+
+  if (!dim_rank_check (dim, array, 1))
+    return false;
+
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_lcobound (gfc_expr *coarray, gfc_expr *dim, gfc_expr *kind)
+{
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %C, use %<-fcoarray=%> to enable");
+      return false;
+    }
+
+  if (!coarray_check (coarray, 0))
+    return false;
+
+  if (dim != NULL)
+    {
+      if (!dim_check (dim, 1, false))
+        return false;
+
+      if (!dim_corank_check (dim, coarray))
+        return false;
+    }
+
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_len_lentrim (gfc_expr *s, gfc_expr *kind)
+{
+  if (!type_check (s, 0, BT_CHARACTER))
+    return false;
+
+  if (!kind_check (kind, 1, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_lge_lgt_lle_llt (gfc_expr *a, gfc_expr *b)
+{
+  if (!type_check (a, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (a, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (b, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (b, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_link (gfc_expr *path1, gfc_expr *path2)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_link_sub (gfc_expr *path1, gfc_expr *path2, gfc_expr *status)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_loc (gfc_expr *expr)
+{
+  return variable_check (expr, 0, true);
+}
+
+
+bool
+gfc_check_symlnk (gfc_expr *path1, gfc_expr *path2)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_symlnk_sub (gfc_expr *path1, gfc_expr *path2, gfc_expr *status)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 1, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_logical (gfc_expr *a, gfc_expr *kind)
+{
+  if (!type_check (a, 0, BT_LOGICAL))
+    return false;
+  if (!kind_check (kind, 1, BT_LOGICAL))
+    return false;
+
+  return true;
+}
+
+
+/* Min/max family.  */
+
+static bool
+min_max_args (gfc_actual_arglist *args)
+{
+  gfc_actual_arglist *arg;
+  int i, j, nargs, *nlabels, nlabelless;
+  bool a1 = false, a2 = false;
+
+  if (args == NULL || args->next == NULL)
+    {
+      gfc_error ("Intrinsic %qs at %L must have at least two arguments",
+		 gfc_current_intrinsic, gfc_current_intrinsic_where);
+      return false;
+    }
+
+  if (!args->name)
+    a1 = true;
+
+  if (!args->next->name)
+    a2 = true;
+
+  nargs = 0;
+  for (arg = args; arg; arg = arg->next)
+    if (arg->name)
+      nargs++;
+
+  if (nargs == 0)
+    return true;
+
+  /* Note: Having a keywordless argument after an "arg=" is checked before.  */
+  nlabelless = 0;
+  nlabels = XALLOCAVEC (int, nargs);
+  for (arg = args, i = 0; arg; arg = arg->next, i++)
+    if (arg->name)
+      {
+	int n;
+	char *endp;
+
+	if (arg->name[0] != 'a' || arg->name[1] < '1' || arg->name[1] > '9')
+	  goto unknown;
+	n = strtol (&arg->name[1], &endp, 10);
+	if (endp[0] != '\0')
+	  goto unknown;
+	if (n <= 0)
+	  goto unknown;
+	if (n <= nlabelless)
+	  goto duplicate;
+	nlabels[i] = n;
+	if (n == 1)
+	  a1 = true;
+	if (n == 2)
+	  a2 = true;
+      }
+    else
+      nlabelless++;
+
+  if (!a1 || !a2)
+    {
+      gfc_error ("Missing %qs argument to the %s intrinsic at %L",
+	         !a1 ? "a1" : "a2", gfc_current_intrinsic,
+		 gfc_current_intrinsic_where);
+      return false;
+    }
+
+  /* Check for duplicates.  */
+  for (i = 0; i < nargs; i++)
+    for (j = i + 1; j < nargs; j++)
+      if (nlabels[i] == nlabels[j])
+	goto duplicate;
+
+  return true;
+
+duplicate:
+  gfc_error ("Duplicate argument %qs at %L to intrinsic %s", arg->name,
+	     &arg->expr->where, gfc_current_intrinsic);
+  return false;
+
+unknown:
+  gfc_error ("Unknown argument %qs at %L to intrinsic %s", arg->name,
+	     &arg->expr->where, gfc_current_intrinsic);
+  return false;
+}
+
+
+static bool
+check_rest (bt type, int kind, gfc_actual_arglist *arglist)
+{
+  gfc_actual_arglist *arg, *tmp;
+  gfc_expr *x;
+  int m, n;
+
+  if (!min_max_args (arglist))
+    return false;
+
+  for (arg = arglist, n=1; arg; arg = arg->next, n++)
+    {
+      x = arg->expr;
+      if (x->ts.type != type || x->ts.kind != kind)
+	{
+	  if (x->ts.type == type)
+	    {
+	      if (!gfc_notify_std (GFC_STD_GNU, "Different type "
+				   "kinds at %L", &x->where))
+		return false;
+	    }
+	  else
+	    {
+	      gfc_error ("%<a%d%> argument of %qs intrinsic at %L must be "
+			 "%s(%d)", n, gfc_current_intrinsic, &x->where,
+			 gfc_basic_typename (type), kind);
+	      return false;
+	    }
+	}
+
+      for (tmp = arglist, m=1; tmp != arg; tmp = tmp->next, m++)
+	if (!gfc_check_conformance (tmp->expr, x,
+				    "arguments 'a%d' and 'a%d' for "
+				    "intrinsic '%s'", m, n,
+				    gfc_current_intrinsic))
+	    return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_min_max (gfc_actual_arglist *arg)
+{
+  gfc_expr *x;
+
+  if (!min_max_args (arg))
+    return false;
+
+  x = arg->expr;
+
+  if (x->ts.type == BT_CHARACTER)
+    {
+      if (!gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			   "with CHARACTER argument at %L",
+			   gfc_current_intrinsic, &x->where))
+	return false;
+    }
+  else if (x->ts.type != BT_INTEGER && x->ts.type != BT_REAL)
+    {
+      gfc_error ("%<a1%> argument of %qs intrinsic at %L must be INTEGER, "
+		 "REAL or CHARACTER", gfc_current_intrinsic, &x->where);
+      return false;
+    }
+
+  return check_rest (x->ts.type, x->ts.kind, arg);
+}
+
+
+bool
+gfc_check_min_max_integer (gfc_actual_arglist *arg)
+{
+  return check_rest (BT_INTEGER, gfc_default_integer_kind, arg);
+}
+
+
+bool
+gfc_check_min_max_real (gfc_actual_arglist *arg)
+{
+  return check_rest (BT_REAL, gfc_default_real_kind, arg);
+}
+
+
+bool
+gfc_check_min_max_double (gfc_actual_arglist *arg)
+{
+  return check_rest (BT_REAL, gfc_default_double_kind, arg);
+}
+
+
+/* End of min/max family.  */
+
+bool
+gfc_check_malloc (gfc_expr *size)
+{
+  if (!type_check (size, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (size, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_matmul (gfc_expr *matrix_a, gfc_expr *matrix_b)
+{
+  if ((matrix_a->ts.type != BT_LOGICAL) && !gfc_numeric_ts (&matrix_a->ts))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be numeric "
+		 "or LOGICAL", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &matrix_a->where);
+      return false;
+    }
+
+  if ((matrix_b->ts.type != BT_LOGICAL) && !gfc_numeric_ts (&matrix_b->ts))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be numeric "
+		 "or LOGICAL", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &matrix_b->where);
+      return false;
+    }
+
+  if ((matrix_a->ts.type == BT_LOGICAL && gfc_numeric_ts (&matrix_b->ts))
+      || (gfc_numeric_ts (&matrix_a->ts) && matrix_b->ts.type == BT_LOGICAL))
+    {
+      gfc_error ("Argument types of %qs intrinsic at %L must match (%s/%s)",
+		 gfc_current_intrinsic, &matrix_a->where,
+		 gfc_typename(&matrix_a->ts), gfc_typename(&matrix_b->ts));
+       return false;
+    }
+
+  switch (matrix_a->rank)
+    {
+    case 1:
+      if (!rank_check (matrix_b, 1, 2))
+	return false;
+      /* Check for case matrix_a has shape(m), matrix_b has shape (m, k).  */
+      if (!identical_dimen_shape (matrix_a, 0, matrix_b, 0))
+	{
+	  gfc_error ("Different shape on dimension 1 for arguments %qs "
+		     "and %qs at %L for intrinsic matmul",
+		     gfc_current_intrinsic_arg[0]->name,
+		     gfc_current_intrinsic_arg[1]->name, &matrix_a->where);
+	  return false;
+	}
+      break;
+
+    case 2:
+      if (matrix_b->rank != 2)
+	{
+	  if (!rank_check (matrix_b, 1, 1))
+	    return false;
+	}
+      /* matrix_b has rank 1 or 2 here. Common check for the cases
+	 - matrix_a has shape (n,m) and matrix_b has shape (m, k)
+	 - matrix_a has shape (n,m) and matrix_b has shape (m).  */
+      if (!identical_dimen_shape (matrix_a, 1, matrix_b, 0))
+	{
+	  gfc_error ("Different shape on dimension 2 for argument %qs and "
+		     "dimension 1 for argument %qs at %L for intrinsic "
+		     "matmul", gfc_current_intrinsic_arg[0]->name,
+		     gfc_current_intrinsic_arg[1]->name, &matrix_a->where);
+	  return false;
+	}
+      break;
+
+    default:
+      gfc_error ("%qs argument of %qs intrinsic at %L must be of rank "
+		 "1 or 2", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &matrix_a->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Whoever came up with this interface was probably on something.
+   The possibilities for the occupation of the second and third
+   parameters are:
+
+	 Arg #2     Arg #3
+	 NULL       NULL
+	 DIM	NULL
+	 MASK       NULL
+	 NULL       MASK	     minloc(array, mask=m)
+	 DIM	MASK
+
+   I.e. in the case of minloc(array,mask), mask will be in the second
+   position of the argument list and we'll have to fix that up.  */
+
+bool
+gfc_check_minloc_maxloc (gfc_actual_arglist *ap)
+{
+  gfc_expr *a, *m, *d;
+
+  a = ap->expr;
+  if (!int_or_real_check (a, 0) || !array_check (a, 0))
+    return false;
+
+  d = ap->next->expr;
+  m = ap->next->next->expr;
+
+  if (m == NULL && d != NULL && d->ts.type == BT_LOGICAL
+      && ap->next->name == NULL)
+    {
+      m = d;
+      d = NULL;
+      ap->next->expr = NULL;
+      ap->next->next->expr = m;
+    }
+
+  if (!dim_check (d, 1, false))
+    return false;
+
+  if (!dim_rank_check (d, a, 0))
+    return false;
+
+  if (m != NULL && !type_check (m, 2, BT_LOGICAL))
+    return false;
+
+  if (m != NULL
+      && !gfc_check_conformance (a, m,
+				 "arguments '%s' and '%s' for intrinsic %s",
+				 gfc_current_intrinsic_arg[0]->name,
+				 gfc_current_intrinsic_arg[2]->name,
+				 gfc_current_intrinsic))
+    return false;
+
+  return true;
+}
+
+
+/* Similar to minloc/maxloc, the argument list might need to be
+   reordered for the MINVAL, MAXVAL, PRODUCT, and SUM intrinsics.  The
+   difference is that MINLOC/MAXLOC take an additional KIND argument.
+   The possibilities are:
+
+	 Arg #2     Arg #3
+	 NULL       NULL
+	 DIM	NULL
+	 MASK       NULL
+	 NULL       MASK	     minval(array, mask=m)
+	 DIM	MASK
+
+   I.e. in the case of minval(array,mask), mask will be in the second
+   position of the argument list and we'll have to fix that up.  */
+
+static bool
+check_reduction (gfc_actual_arglist *ap)
+{
+  gfc_expr *a, *m, *d;
+
+  a = ap->expr;
+  d = ap->next->expr;
+  m = ap->next->next->expr;
+
+  if (m == NULL && d != NULL && d->ts.type == BT_LOGICAL
+      && ap->next->name == NULL)
+    {
+      m = d;
+      d = NULL;
+      ap->next->expr = NULL;
+      ap->next->next->expr = m;
+    }
+
+  if (!dim_check (d, 1, false))
+    return false;
+
+  if (!dim_rank_check (d, a, 0))
+    return false;
+
+  if (m != NULL && !type_check (m, 2, BT_LOGICAL))
+    return false;
+
+  if (m != NULL
+      && !gfc_check_conformance (a, m,
+				 "arguments '%s' and '%s' for intrinsic %s",
+				 gfc_current_intrinsic_arg[0]->name,
+				 gfc_current_intrinsic_arg[2]->name,
+				 gfc_current_intrinsic))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_minval_maxval (gfc_actual_arglist *ap)
+{
+  if (!int_or_real_check (ap->expr, 0)
+      || !array_check (ap->expr, 0))
+    return false;
+
+  return check_reduction (ap);
+}
+
+
+bool
+gfc_check_product_sum (gfc_actual_arglist *ap)
+{
+  if (!numeric_check (ap->expr, 0)
+      || !array_check (ap->expr, 0))
+    return false;
+
+  return check_reduction (ap);
+}
+
+
+/* For IANY, IALL and IPARITY.  */
+
+bool
+gfc_check_mask (gfc_expr *i, gfc_expr *kind)
+{
+  int k;
+
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("I", i))
+    return false;
+
+  if (!kind_check (kind, 1, BT_INTEGER))
+    return false;
+
+  if (kind)
+    gfc_extract_int (kind, &k);
+  else
+    k = gfc_default_integer_kind;
+
+  if (!less_than_bitsizekind ("I", i, k))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_transf_bit_intrins (gfc_actual_arglist *ap)
+{
+  if (ap->expr->ts.type != BT_INTEGER)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be INTEGER",
+                 gfc_current_intrinsic_arg[0]->name,
+                 gfc_current_intrinsic, &ap->expr->where);
+      return false;
+    }
+
+  if (!array_check (ap->expr, 0))
+    return false;
+
+  return check_reduction (ap);
+}
+
+
+bool
+gfc_check_merge (gfc_expr *tsource, gfc_expr *fsource, gfc_expr *mask)
+{
+  if (!same_type_check (tsource, 0, fsource, 1))
+    return false;
+
+  if (!type_check (mask, 2, BT_LOGICAL))
+    return false;
+
+  if (tsource->ts.type == BT_CHARACTER)
+    return gfc_check_same_strlen (tsource, fsource, "MERGE intrinsic");
+
+  return true;
+}
+
+
+bool
+gfc_check_merge_bits (gfc_expr *i, gfc_expr *j, gfc_expr *mask)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (j, 1, BT_INTEGER))
+    return false;
+
+  if (!type_check (mask, 2, BT_INTEGER))
+    return false;
+
+  if (!same_type_check (i, 0, j, 1))
+    return false;
+
+  if (!same_type_check (i, 0, mask, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_move_alloc (gfc_expr *from, gfc_expr *to)
+{
+  if (!variable_check (from, 0, false))
+    return false;
+  if (!allocatable_check (from, 0))
+    return false;
+  if (gfc_is_coindexed (from))
+    {
+      gfc_error ("The FROM argument to MOVE_ALLOC at %L shall not be "
+		 "coindexed", &from->where);
+      return false;
+    }
+
+  if (!variable_check (to, 1, false))
+    return false;
+  if (!allocatable_check (to, 1))
+    return false;
+  if (gfc_is_coindexed (to))
+    {
+      gfc_error ("The TO argument to MOVE_ALLOC at %L shall not be "
+		 "coindexed", &to->where);
+      return false;
+    }
+
+  if (from->ts.type == BT_CLASS && to->ts.type == BT_DERIVED)
+    {
+      gfc_error ("The TO arguments in MOVE_ALLOC at %L must be "
+		 "polymorphic if FROM is polymorphic",
+		 &to->where);
+      return false;
+    }
+
+  if (!same_type_check (to, 1, from, 0))
+    return false;
+
+  if (to->rank != from->rank)
+    {
+      gfc_error ("The FROM and TO arguments of the MOVE_ALLOC intrinsic at %L "
+		 "must have the same rank %d/%d", &to->where,  from->rank,
+		 to->rank);
+      return false;
+    }
+
+  /* IR F08/0040; cf. 12-006A.  */
+  if (gfc_get_corank (to) != gfc_get_corank (from))
+    {
+      gfc_error ("The FROM and TO arguments of the MOVE_ALLOC intrinsic at %L "
+		 "must have the same corank %d/%d", &to->where,
+		 gfc_get_corank (from), gfc_get_corank (to));
+      return false;
+    }
+
+  /*  This is based losely on F2003 12.4.1.7. It is intended to prevent
+      the likes of to = sym->cmp1->cmp2 and from = sym->cmp1, where cmp1
+      and cmp2 are allocatable.  After the allocation is transferred,
+      the 'to' chain is broken by the nullification of the 'from'. A bit
+      of reflection reveals that this can only occur for derived types
+      with recursive allocatable components.  */
+  if (to->expr_type == EXPR_VARIABLE && from->expr_type == EXPR_VARIABLE
+      && !strcmp (to->symtree->n.sym->name, from->symtree->n.sym->name))
+    {
+      gfc_ref *to_ref, *from_ref;
+      to_ref = to->ref;
+      from_ref = from->ref;
+      bool aliasing = true;
+
+      for (; from_ref && to_ref;
+	   from_ref = from_ref->next, to_ref = to_ref->next)
+	{
+	  if (to_ref->type != from->ref->type)
+	    aliasing = false;
+	  else if (to_ref->type == REF_ARRAY
+		   && to_ref->u.ar.type != AR_FULL
+		   && from_ref->u.ar.type != AR_FULL)
+	    /* Play safe; assume sections and elements are different.  */
+	    aliasing = false;
+	  else if (to_ref->type == REF_COMPONENT
+		   && to_ref->u.c.component != from_ref->u.c.component)
+	    aliasing = false;
+
+	  if (!aliasing)
+	    break;
+	}
+
+      if (aliasing)
+	{
+	  gfc_error ("The FROM and TO arguments at %L violate aliasing "
+		     "restrictions (F2003 12.4.1.7)", &to->where);
+	  return false;
+	}
+    }
+
+  /* CLASS arguments: Make sure the vtab of from is present.  */
+  if (to->ts.type == BT_CLASS && !UNLIMITED_POLY (from))
+    gfc_find_vtab (&from->ts);
+
+  return true;
+}
+
+
+bool
+gfc_check_nearest (gfc_expr *x, gfc_expr *s)
+{
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+
+  if (!type_check (s, 1, BT_REAL))
+    return false;
+
+  if (s->expr_type == EXPR_CONSTANT)
+    {
+      if (mpfr_sgn (s->value.real) == 0)
+	{
+	  gfc_error ("Argument %<S%> of NEAREST at %L shall not be zero",
+		     &s->where);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_new_line (gfc_expr *a)
+{
+  if (!type_check (a, 0, BT_CHARACTER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_norm2 (gfc_expr *array, gfc_expr *dim)
+{
+  if (!type_check (array, 0, BT_REAL))
+    return false;
+
+  if (!array_check (array, 0))
+    return false;
+
+  if (!dim_rank_check (dim, array, false))
+    return false;
+
+  return true;
+}
+
+bool
+gfc_check_null (gfc_expr *mold)
+{
+  symbol_attribute attr;
+
+  if (mold == NULL)
+    return true;
+
+  if (!variable_check (mold, 0, true))
+    return false;
+
+  attr = gfc_variable_attr (mold, NULL);
+
+  if (!attr.pointer && !attr.proc_pointer && !attr.allocatable)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a POINTER, "
+		 "ALLOCATABLE or procedure pointer",
+		 gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &mold->where);
+      return false;
+    }
+
+  if (attr.allocatable
+      && !gfc_notify_std (GFC_STD_F2003, "NULL intrinsic with "
+			  "allocatable MOLD at %L", &mold->where))
+    return false;
+
+  /* F2008, C1242.  */
+  if (gfc_is_coindexed (mold))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be "
+		 "coindexed", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &mold->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_pack (gfc_expr *array, gfc_expr *mask, gfc_expr *vector)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!type_check (mask, 1, BT_LOGICAL))
+    return false;
+
+  if (!gfc_check_conformance (array, mask,
+			      "arguments '%s' and '%s' for intrinsic '%s'",
+			      gfc_current_intrinsic_arg[0]->name,
+			      gfc_current_intrinsic_arg[1]->name,
+			      gfc_current_intrinsic))
+    return false;
+
+  if (vector != NULL)
+    {
+      mpz_t array_size, vector_size;
+      bool have_array_size, have_vector_size;
+
+      if (!same_type_check (array, 0, vector, 2))
+	return false;
+
+      if (!rank_check (vector, 2, 1))
+	return false;
+
+      /* VECTOR requires at least as many elements as MASK
+         has .TRUE. values.  */
+      have_array_size = gfc_array_size(array, &array_size);
+      have_vector_size = gfc_array_size(vector, &vector_size);
+
+      if (have_vector_size
+	  && (mask->expr_type == EXPR_ARRAY
+	      || (mask->expr_type == EXPR_CONSTANT
+		  && have_array_size)))
+	{
+	  int mask_true_values = 0;
+
+	  if (mask->expr_type == EXPR_ARRAY)
+	    {
+	      gfc_constructor *mask_ctor;
+	      mask_ctor = gfc_constructor_first (mask->value.constructor);
+	      while (mask_ctor)
+		{
+		  if (mask_ctor->expr->expr_type != EXPR_CONSTANT)
+		    {
+		      mask_true_values = 0;
+		      break;
+		    }
+
+		  if (mask_ctor->expr->value.logical)
+		    mask_true_values++;
+
+		  mask_ctor = gfc_constructor_next (mask_ctor);
+		}
+	    }
+	  else if (mask->expr_type == EXPR_CONSTANT && mask->value.logical)
+	    mask_true_values = mpz_get_si (array_size);
+
+	  if (mpz_get_si (vector_size) < mask_true_values)
+	    {
+	      gfc_error ("%qs argument of %qs intrinsic at %L must "
+			 "provide at least as many elements as there "
+			 "are .TRUE. values in %qs (%ld/%d)",
+			 gfc_current_intrinsic_arg[2]->name,
+			 gfc_current_intrinsic, &vector->where,
+			 gfc_current_intrinsic_arg[1]->name,
+			 mpz_get_si (vector_size), mask_true_values);
+	      return false;
+	    }
+	}
+
+      if (have_array_size)
+	mpz_clear (array_size);
+      if (have_vector_size)
+	mpz_clear (vector_size);
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_parity (gfc_expr *mask, gfc_expr *dim)
+{
+  if (!type_check (mask, 0, BT_LOGICAL))
+    return false;
+
+  if (!array_check (mask, 0))
+    return false;
+
+  if (!dim_rank_check (dim, mask, false))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_precision (gfc_expr *x)
+{
+  if (!real_or_complex_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_present (gfc_expr *a)
+{
+  gfc_symbol *sym;
+
+  if (!variable_check (a, 0, true))
+    return false;
+
+  sym = a->symtree->n.sym;
+  if (!sym->attr.dummy)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be of a "
+		 "dummy variable", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &a->where);
+      return false;
+    }
+
+  if (!sym->attr.optional)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be of "
+		 "an OPTIONAL dummy variable",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &a->where);
+      return false;
+    }
+
+  /* 13.14.82  PRESENT(A)
+     ......
+     Argument.  A shall be the name of an optional dummy argument that is
+     accessible in the subprogram in which the PRESENT function reference
+     appears...  */
+
+  if (a->ref != NULL
+      && !(a->ref->next == NULL && a->ref->type == REF_ARRAY
+	   && (a->ref->u.ar.type == AR_FULL
+	       || (a->ref->u.ar.type == AR_ELEMENT
+		   && a->ref->u.ar.as->rank == 0))))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must not be a "
+		 "subobject of %qs", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &a->where, sym->name);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_radix (gfc_expr *x)
+{
+  if (!int_or_real_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_range (gfc_expr *x)
+{
+  if (!numeric_check (x, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_rank (gfc_expr *a)
+{
+  /* Any data object is allowed; a "data object" is a "constant (4.1.3),
+     variable (6), or subobject of a constant (2.4.3.2.3)" (F2008, 1.3.45).  */
+
+  bool is_variable = true;
+
+  /* Functions returning pointers are regarded as variable, cf. F2008, R602.  */
+  if (a->expr_type == EXPR_FUNCTION)
+    is_variable = a->value.function.esym
+		  ? a->value.function.esym->result->attr.pointer
+		  : a->symtree->n.sym->result->attr.pointer;
+
+  if (a->expr_type == EXPR_OP || a->expr_type == EXPR_NULL
+      || a->expr_type == EXPR_COMPCALL|| a->expr_type == EXPR_PPC
+      || !is_variable)
+    {
+      gfc_error ("The argument of the RANK intrinsic at %L must be a data "
+		 "object", &a->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* real, float, sngl.  */
+bool
+gfc_check_real (gfc_expr *a, gfc_expr *kind)
+{
+  if (!numeric_check (a, 0))
+    return false;
+
+  if (!kind_check (kind, 1, BT_REAL))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_rename (gfc_expr *path1, gfc_expr *path2)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_rename_sub (gfc_expr *path1, gfc_expr *path2, gfc_expr *status)
+{
+  if (!type_check (path1, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path1, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (path2, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (path2, 1, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_repeat (gfc_expr *x, gfc_expr *y)
+{
+  if (!type_check (x, 0, BT_CHARACTER))
+    return false;
+
+  if (!scalar_check (x, 0))
+    return false;
+
+  if (!type_check (y, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (y, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_reshape (gfc_expr *source, gfc_expr *shape,
+		   gfc_expr *pad, gfc_expr *order)
+{
+  mpz_t size;
+  mpz_t nelems;
+  int shape_size;
+
+  if (!array_check (source, 0))
+    return false;
+
+  if (!rank_check (shape, 1, 1))
+    return false;
+
+  if (!type_check (shape, 1, BT_INTEGER))
+    return false;
+
+  if (!gfc_array_size (shape, &size))
+    {
+      gfc_error ("%<shape%> argument of %<reshape%> intrinsic at %L must be an "
+		 "array of constant size", &shape->where);
+      return false;
+    }
+
+  shape_size = mpz_get_ui (size);
+  mpz_clear (size);
+
+  if (shape_size <= 0)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L is empty",
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &shape->where);
+      return false;
+    }
+  else if (shape_size > GFC_MAX_DIMENSIONS)
+    {
+      gfc_error ("%<shape%> argument of %<reshape%> intrinsic at %L has more "
+		 "than %d elements", &shape->where, GFC_MAX_DIMENSIONS);
+      return false;
+    }
+  else if (shape->expr_type == EXPR_ARRAY && gfc_is_constant_expr (shape))
+    {
+      gfc_expr *e;
+      int i, extent;
+      for (i = 0; i < shape_size; ++i)
+	{
+	  e = gfc_constructor_lookup_expr (shape->value.constructor, i);
+	  if (e->expr_type != EXPR_CONSTANT)
+	    continue;
+
+	  gfc_extract_int (e, &extent);
+	  if (extent < 0)
+	    {
+	      gfc_error ("%qs argument of %qs intrinsic at %L has "
+			 "negative element (%d)",
+			 gfc_current_intrinsic_arg[1]->name,
+			 gfc_current_intrinsic, &e->where, extent);
+	      return false;
+	    }
+	}
+    }
+  else if (shape->expr_type == EXPR_VARIABLE && shape->ref
+	   && shape->ref->u.ar.type == AR_FULL && shape->ref->u.ar.dimen == 1
+	   && shape->ref->u.ar.as
+	   && shape->ref->u.ar.as->lower[0]->expr_type == EXPR_CONSTANT
+	   && shape->ref->u.ar.as->lower[0]->ts.type == BT_INTEGER
+	   && shape->ref->u.ar.as->upper[0]->expr_type == EXPR_CONSTANT
+	   && shape->ref->u.ar.as->upper[0]->ts.type == BT_INTEGER
+	   && shape->symtree->n.sym->attr.flavor == FL_PARAMETER)
+    {
+      int i, extent;
+      gfc_expr *e, *v;
+
+      v = shape->symtree->n.sym->value;
+
+      for (i = 0; i < shape_size; i++)
+	{
+	  e = gfc_constructor_lookup_expr (v->value.constructor, i);
+	  if (e == NULL)
+	     break;
+
+	  gfc_extract_int (e, &extent);
+
+	  if (extent < 0)
+	    {
+	      gfc_error ("Element %d of actual argument of RESHAPE at %L "
+			 "cannot be negative", i + 1, &shape->where);
+	      return false;
+	    }
+	}
+    }
+
+  if (pad != NULL)
+    {
+      if (!same_type_check (source, 0, pad, 2))
+	return false;
+
+      if (!array_check (pad, 2))
+	return false;
+    }
+
+  if (order != NULL)
+    {
+      if (!array_check (order, 3))
+	return false;
+
+      if (!type_check (order, 3, BT_INTEGER))
+	return false;
+
+      if (order->expr_type == EXPR_ARRAY && gfc_is_constant_expr (order))
+	{
+	  int i, order_size, dim, perm[GFC_MAX_DIMENSIONS];
+	  gfc_expr *e;
+
+	  for (i = 0; i < GFC_MAX_DIMENSIONS; ++i)
+	    perm[i] = 0;
+
+	  gfc_array_size (order, &size);
+	  order_size = mpz_get_ui (size);
+	  mpz_clear (size);
+
+	  if (order_size != shape_size)
+	    {
+	      gfc_error ("%qs argument of %qs intrinsic at %L "
+			 "has wrong number of elements (%d/%d)",
+			 gfc_current_intrinsic_arg[3]->name,
+			 gfc_current_intrinsic, &order->where,
+			 order_size, shape_size);
+	      return false;
+	    }
+
+	  for (i = 1; i <= order_size; ++i)
+	    {
+	      e = gfc_constructor_lookup_expr (order->value.constructor, i-1);
+	      if (e->expr_type != EXPR_CONSTANT)
+		continue;
+
+	      gfc_extract_int (e, &dim);
+
+	      if (dim < 1 || dim > order_size)
+		{
+		  gfc_error ("%qs argument of %qs intrinsic at %L "
+			     "has out-of-range dimension (%d)",
+			     gfc_current_intrinsic_arg[3]->name,
+			     gfc_current_intrinsic, &e->where, dim);
+		  return false;
+		}
+
+	      if (perm[dim-1] != 0)
+		{
+		  gfc_error ("%qs argument of %qs intrinsic at %L has "
+			     "invalid permutation of dimensions (dimension "
+			     "%qd duplicated)",
+			     gfc_current_intrinsic_arg[3]->name,
+			     gfc_current_intrinsic, &e->where, dim);
+		  return false;
+		}
+
+	      perm[dim-1] = 1;
+	    }
+	}
+    }
+
+  if (pad == NULL && shape->expr_type == EXPR_ARRAY
+      && gfc_is_constant_expr (shape)
+      && !(source->expr_type == EXPR_VARIABLE && source->symtree->n.sym->as
+	   && source->symtree->n.sym->as->type == AS_ASSUMED_SIZE))
+    {
+      /* Check the match in size between source and destination.  */
+      if (gfc_array_size (source, &nelems))
+	{
+	  gfc_constructor *c;
+	  bool test;
+
+
+	  mpz_init_set_ui (size, 1);
+	  for (c = gfc_constructor_first (shape->value.constructor);
+	       c; c = gfc_constructor_next (c))
+	    mpz_mul (size, size, c->expr->value.integer);
+
+	  test = mpz_cmp (nelems, size) < 0 && mpz_cmp_ui (size, 0) > 0;
+	  mpz_clear (nelems);
+	  mpz_clear (size);
+
+	  if (test)
+	    {
+	      gfc_error ("Without padding, there are not enough elements "
+			 "in the intrinsic RESHAPE source at %L to match "
+			 "the shape", &source->where);
+	      return false;
+	    }
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_same_type_as (gfc_expr *a, gfc_expr *b)
+{
+  if (a->ts.type != BT_DERIVED && a->ts.type != BT_CLASS)
+    {
+        gfc_error ("%qs argument of %qs intrinsic at %L "
+		   "cannot be of type %s",
+		   gfc_current_intrinsic_arg[0]->name,
+		   gfc_current_intrinsic,
+		   &a->where, gfc_typename (&a->ts));
+        return false;
+    }
+
+  if (!(gfc_type_is_extensible (a->ts.u.derived) || UNLIMITED_POLY (a)))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L "
+		 "must be of an extensible type",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &a->where);
+      return false;
+    }
+
+  if (b->ts.type != BT_DERIVED && b->ts.type != BT_CLASS)
+    {
+        gfc_error ("%qs argument of %qs intrinsic at %L "
+		   "cannot be of type %s",
+		   gfc_current_intrinsic_arg[0]->name,
+		   gfc_current_intrinsic,
+		   &b->where, gfc_typename (&b->ts));
+      return false;
+    }
+
+  if (!(gfc_type_is_extensible (b->ts.u.derived) || UNLIMITED_POLY (b)))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L "
+		 "must be of an extensible type",
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &b->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_scale (gfc_expr *x, gfc_expr *i)
+{
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+
+  if (!type_check (i, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_scan (gfc_expr *x, gfc_expr *y, gfc_expr *z, gfc_expr *kind)
+{
+  if (!type_check (x, 0, BT_CHARACTER))
+    return false;
+
+  if (!type_check (y, 1, BT_CHARACTER))
+    return false;
+
+  if (z != NULL && !type_check (z, 2, BT_LOGICAL))
+    return false;
+
+  if (!kind_check (kind, 3, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  if (!same_type_check (x, 0, y, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_secnds (gfc_expr *r)
+{
+  if (!type_check (r, 0, BT_REAL))
+    return false;
+
+  if (!kind_value_check (r, 0, 4))
+    return false;
+
+  if (!scalar_check (r, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_selected_char_kind (gfc_expr *name)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!scalar_check (name, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_selected_int_kind (gfc_expr *r)
+{
+  if (!type_check (r, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (r, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_selected_real_kind (gfc_expr *p, gfc_expr *r, gfc_expr *radix)
+{
+  if (p == NULL && r == NULL
+      && !gfc_notify_std (GFC_STD_F2008, "SELECTED_REAL_KIND with"
+			  " neither %<P%> nor %<R%> argument at %L",
+			  gfc_current_intrinsic_where))
+    return false;
+
+  if (p)
+    {
+      if (!type_check (p, 0, BT_INTEGER))
+	return false;
+
+      if (!scalar_check (p, 0))
+	return false;
+    }
+
+  if (r)
+    {
+      if (!type_check (r, 1, BT_INTEGER))
+	return false;
+
+      if (!scalar_check (r, 1))
+	return false;
+    }
+
+  if (radix)
+    {
+      if (!type_check (radix, 1, BT_INTEGER))
+	return false;
+
+      if (!scalar_check (radix, 1))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008, "%qs intrinsic with "
+			   "RADIX argument at %L", gfc_current_intrinsic,
+			   &radix->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_set_exponent (gfc_expr *x, gfc_expr *i)
+{
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+
+  if (!type_check (i, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_shape (gfc_expr *source, gfc_expr *kind)
+{
+  gfc_array_ref *ar;
+
+  if (source->rank == 0 || source->expr_type != EXPR_VARIABLE)
+    return true;
+
+  ar = gfc_find_array_ref (source);
+
+  if (ar->as && ar->as->type == AS_ASSUMED_SIZE && ar->type == AR_FULL)
+    {
+      gfc_error ("%<source%> argument of %<shape%> intrinsic at %L must not be "
+		 "an assumed size array", &source->where);
+      return false;
+    }
+
+  if (!kind_check (kind, 1, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_shift (gfc_expr *i, gfc_expr *shift)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (shift, 0, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("SHIFT", shift))
+    return false;
+
+  if (!less_than_bitsize1 ("I", i, "SHIFT", shift, true))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_sign (gfc_expr *a, gfc_expr *b)
+{
+  if (!int_or_real_check (a, 0))
+    return false;
+
+  if (!same_type_check (a, 0, b, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_size (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!dim_check (dim, 1, true))
+    return false;
+
+  if (!dim_rank_check (dim, array, 0))
+    return false;
+
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+
+  return true;
+}
+
+
+bool
+gfc_check_sizeof (gfc_expr *arg)
+{
+  if (arg->ts.type == BT_PROCEDURE)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be a procedure",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &arg->where);
+      return false;
+    }
+
+  /* TYPE(*) is acceptable if and only if it uses an array descriptor.  */
+  if (arg->ts.type == BT_ASSUMED
+      && (arg->symtree->n.sym->as == NULL
+	  || (arg->symtree->n.sym->as->type != AS_ASSUMED_SHAPE
+	      && arg->symtree->n.sym->as->type != AS_DEFERRED
+	      && arg->symtree->n.sym->as->type != AS_ASSUMED_RANK)))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be TYPE(*)",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &arg->where);
+      return false;
+    }
+
+  if (arg->rank && arg->expr_type == EXPR_VARIABLE
+      && arg->symtree->n.sym->as != NULL
+      && arg->symtree->n.sym->as->type == AS_ASSUMED_SIZE && arg->ref
+      && arg->ref->type == REF_ARRAY && arg->ref->u.ar.type == AR_FULL)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be an "
+		 "assumed-size array", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &arg->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+/* Check whether an expression is interoperable.  When returning false,
+   msg is set to a string telling why the expression is not interoperable,
+   otherwise, it is set to NULL.  The msg string can be used in diagnostics.
+   If c_loc is true, character with len > 1 are allowed (cf. Fortran
+   2003corr5); additionally, assumed-shape/assumed-rank/deferred-shape
+   arrays are permitted. And if c_f_ptr is true, deferred-shape arrays
+   are permitted.  */
+
+static bool
+is_c_interoperable (gfc_expr *expr, const char **msg, bool c_loc, bool c_f_ptr)
+{
+  *msg = NULL;
+
+  if (expr->ts.type == BT_CLASS)
+    {
+      *msg = "Expression is polymorphic";
+      return false;
+    }
+
+  if (expr->ts.type == BT_DERIVED && !expr->ts.u.derived->attr.is_bind_c
+      && !expr->ts.u.derived->ts.is_iso_c)
+    {
+      *msg = "Expression is a noninteroperable derived type";
+      return false;
+    }
+
+  if (expr->ts.type == BT_PROCEDURE)
+    {
+      *msg = "Procedure unexpected as argument";
+      return false;
+    }
+
+  if (gfc_notification_std (GFC_STD_GNU) && expr->ts.type == BT_LOGICAL)
+    {
+      int i;
+      for (i = 0; gfc_logical_kinds[i].kind; i++)
+        if (gfc_logical_kinds[i].kind == expr->ts.kind)
+          return true;
+      *msg = "Extension to use a non-C_Bool-kind LOGICAL";
+      return false;
+    }
+
+  if (gfc_notification_std (GFC_STD_GNU) && expr->ts.type == BT_CHARACTER
+      && expr->ts.kind != 1)
+    {
+      *msg = "Extension to use a non-C_CHAR-kind CHARACTER";
+      return false;
+    }
+
+  if (expr->ts.type == BT_CHARACTER) {
+    if (expr->ts.deferred)
+      {
+	/* TS 29113 allows deferred-length strings as dummy arguments,
+	   but it is not an interoperable type.  */
+	*msg = "Expression shall not be a deferred-length string";
+	return false;
+      }
+
+    if (expr->ts.u.cl && expr->ts.u.cl->length
+	&& !gfc_simplify_expr (expr->ts.u.cl->length, 0))
+      gfc_internal_error ("is_c_interoperable(): gfc_simplify_expr failed");
+
+    if (!c_loc && expr->ts.u.cl
+	&& (!expr->ts.u.cl->length
+	    || expr->ts.u.cl->length->expr_type != EXPR_CONSTANT
+	    || mpz_cmp_si (expr->ts.u.cl->length->value.integer, 1) != 0))
+      {
+	*msg = "Type shall have a character length of 1";
+	return false;
+      }
+    }
+
+  /* Note: The following checks are about interoperatable variables, Fortran
+     15.3.5/15.3.6.  In intrinsics like C_LOC or in procedure interface, more
+     is allowed, e.g. assumed-shape arrays with TS 29113.  */
+
+  if (gfc_is_coarray (expr))
+    {
+      *msg = "Coarrays are not interoperable";
+      return false;
+    }
+
+  if (!c_loc && expr->rank > 0 && expr->expr_type != EXPR_ARRAY)
+    {
+      gfc_array_ref *ar = gfc_find_array_ref (expr);
+      if (ar->type != AR_FULL)
+	{
+	  *msg = "Only whole-arrays are interoperable";
+	  return false;
+	}
+      if (!c_f_ptr && ar->as->type != AS_EXPLICIT
+	  && ar->as->type != AS_ASSUMED_SIZE)
+	{
+	  *msg = "Only explicit-size and assumed-size arrays are interoperable";
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_c_sizeof (gfc_expr *arg)
+{
+  const char *msg;
+
+  if (!is_c_interoperable (arg, &msg, false, false))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be an "
+		 "interoperable data entity: %s",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &arg->where, msg);
+      return false;
+    }
+
+  if (arg->ts.type == BT_ASSUMED)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be "
+		 "TYPE(*)",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &arg->where);
+      return false;
+    }
+
+  if (arg->rank && arg->expr_type == EXPR_VARIABLE
+      && arg->symtree->n.sym->as != NULL
+      && arg->symtree->n.sym->as->type == AS_ASSUMED_SIZE && arg->ref
+      && arg->ref->type == REF_ARRAY && arg->ref->u.ar.type == AR_FULL)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be an "
+		 "assumed-size array", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &arg->where);
+      return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_c_associated (gfc_expr *c_ptr_1, gfc_expr *c_ptr_2)
+{
+  if (c_ptr_1->ts.type != BT_DERIVED
+      || c_ptr_1->ts.u.derived->from_intmod != INTMOD_ISO_C_BINDING
+      || (c_ptr_1->ts.u.derived->intmod_sym_id != ISOCBINDING_PTR
+	  && c_ptr_1->ts.u.derived->intmod_sym_id != ISOCBINDING_FUNPTR))
+    {
+      gfc_error ("Argument C_PTR_1 at %L to C_ASSOCIATED shall have the "
+		 "type TYPE(C_PTR) or TYPE(C_FUNPTR)", &c_ptr_1->where);
+      return false;
+    }
+
+  if (!scalar_check (c_ptr_1, 0))
+    return false;
+
+  if (c_ptr_2
+      && (c_ptr_2->ts.type != BT_DERIVED
+	  || c_ptr_2->ts.u.derived->from_intmod != INTMOD_ISO_C_BINDING
+	  || (c_ptr_1->ts.u.derived->intmod_sym_id
+	      != c_ptr_2->ts.u.derived->intmod_sym_id)))
+    {
+      gfc_error ("Argument C_PTR_2 at %L to C_ASSOCIATED shall have the "
+		 "same type as C_PTR_1: %s instead of %s", &c_ptr_1->where,
+		 gfc_typename (&c_ptr_1->ts),
+		 gfc_typename (&c_ptr_2->ts));
+      return false;
+    }
+
+  if (c_ptr_2 && !scalar_check (c_ptr_2, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_c_f_pointer (gfc_expr *cptr, gfc_expr *fptr, gfc_expr *shape)
+{
+  symbol_attribute attr;
+  const char *msg;
+
+  if (cptr->ts.type != BT_DERIVED
+      || cptr->ts.u.derived->from_intmod != INTMOD_ISO_C_BINDING
+      || cptr->ts.u.derived->intmod_sym_id != ISOCBINDING_PTR)
+    {
+      gfc_error ("Argument CPTR at %L to C_F_POINTER shall have the "
+		 "type TYPE(C_PTR)", &cptr->where);
+      return false;
+    }
+
+  if (!scalar_check (cptr, 0))
+    return false;
+
+  attr = gfc_expr_attr (fptr);
+
+  if (!attr.pointer)
+    {
+      gfc_error ("Argument FPTR at %L to C_F_POINTER must be a pointer",
+		 &fptr->where);
+      return false;
+    }
+
+  if (fptr->ts.type == BT_CLASS)
+    {
+      gfc_error ("FPTR argument at %L to C_F_POINTER shall not be polymorphic",
+		 &fptr->where);
+      return false;
+    }
+
+  if (gfc_is_coindexed (fptr))
+    {
+      gfc_error ("Argument FPTR at %L to C_F_POINTER shall not be "
+		 "coindexed", &fptr->where);
+      return false;
+    }
+
+  if (fptr->rank == 0 && shape)
+    {
+      gfc_error ("Unexpected SHAPE argument at %L to C_F_POINTER with scalar "
+		 "FPTR", &fptr->where);
+      return false;
+    }
+  else if (fptr->rank && !shape)
+    {
+      gfc_error ("Expected SHAPE argument to C_F_POINTER with array "
+		 "FPTR at %L", &fptr->where);
+      return false;
+    }
+
+  if (shape && !rank_check (shape, 2, 1))
+    return false;
+
+  if (shape && !type_check (shape, 2, BT_INTEGER))
+    return false;
+
+  if (shape)
+    {
+      mpz_t size;
+      if (gfc_array_size (shape, &size))
+	{
+	  if (mpz_cmp_ui (size, fptr->rank) != 0)
+	    {
+	      mpz_clear (size);
+	      gfc_error ("SHAPE argument at %L to C_F_POINTER must have the same "
+			"size as the RANK of FPTR", &shape->where);
+	      return false;
+	    }
+	  mpz_clear (size);
+	}
+    }
+
+  if (fptr->ts.type == BT_CLASS)
+    {
+      gfc_error ("Polymorphic FPTR at %L to C_F_POINTER", &fptr->where);
+      return false;
+    }
+
+  if (!is_c_interoperable (fptr, &msg, false, true))
+    return gfc_notify_std (GFC_STD_F2008_TS, "Noninteroperable array FPTR "
+			   "at %L to C_F_POINTER: %s", &fptr->where, msg);
+
+  return true;
+}
+
+
+bool
+gfc_check_c_f_procpointer (gfc_expr *cptr, gfc_expr *fptr)
+{
+  symbol_attribute attr;
+
+  if (cptr->ts.type != BT_DERIVED
+      || cptr->ts.u.derived->from_intmod != INTMOD_ISO_C_BINDING
+      || cptr->ts.u.derived->intmod_sym_id != ISOCBINDING_FUNPTR)
+    {
+      gfc_error ("Argument CPTR at %L to C_F_PROCPOINTER shall have the "
+		 "type TYPE(C_FUNPTR)", &cptr->where);
+      return false;
+    }
+
+  if (!scalar_check (cptr, 0))
+    return false;
+
+  attr = gfc_expr_attr (fptr);
+
+  if (!attr.proc_pointer)
+    {
+      gfc_error ("Argument FPTR at %L to C_F_PROCPOINTER shall be a procedure "
+		 "pointer", &fptr->where);
+      return false;
+    }
+
+  if (gfc_is_coindexed (fptr))
+    {
+      gfc_error ("Argument FPTR at %L to C_F_PROCPOINTER shall not be "
+		 "coindexed", &fptr->where);
+      return false;
+    }
+
+  if (!attr.is_bind_c)
+    return gfc_notify_std (GFC_STD_F2008_TS, "Noninteroperable procedure "
+			   "pointer at %L to C_F_PROCPOINTER", &fptr->where);
+
+  return true;
+}
+
+
+bool
+gfc_check_c_funloc (gfc_expr *x)
+{
+  symbol_attribute attr;
+
+  if (gfc_is_coindexed (x))
+    {
+      gfc_error ("Argument X at %L to C_FUNLOC shall not be "
+		 "coindexed", &x->where);
+      return false;
+    }
+
+  attr = gfc_expr_attr (x);
+
+  if (attr.function && !attr.proc_pointer && x->expr_type == EXPR_VARIABLE
+      && x->symtree->n.sym == x->symtree->n.sym->result)
+    {
+      gfc_namespace *ns = gfc_current_ns;
+
+      for (ns = gfc_current_ns; ns; ns = ns->parent)
+	if (x->symtree->n.sym == ns->proc_name)
+	  {
+	    gfc_error ("Function result %qs at %L is invalid as X argument "
+		       "to C_FUNLOC", x->symtree->n.sym->name, &x->where);
+	    return false;
+	  }
+    }
+
+  if (attr.flavor != FL_PROCEDURE)
+    {
+      gfc_error ("Argument X at %L to C_FUNLOC shall be a procedure "
+		 "or a procedure pointer", &x->where);
+      return false;
+    }
+
+  if (!attr.is_bind_c)
+    return gfc_notify_std (GFC_STD_F2008_TS, "Noninteroperable procedure "
+			   "at %L to C_FUNLOC", &x->where);
+  return true;
+}
+
+
+bool
+gfc_check_c_loc (gfc_expr *x)
+{
+  symbol_attribute attr;
+  const char *msg;
+
+  if (gfc_is_coindexed (x))
+    {
+      gfc_error ("Argument X at %L to C_LOC shall not be coindexed", &x->where);
+      return false;
+    }
+
+  if (x->ts.type == BT_CLASS)
+    {
+      gfc_error ("X argument at %L to C_LOC shall not be polymorphic",
+		 &x->where);
+      return false;
+    }
+
+  attr = gfc_expr_attr (x);
+
+  if (!attr.pointer
+      && (x->expr_type != EXPR_VARIABLE || !attr.target
+	  || attr.flavor == FL_PARAMETER))
+    {
+      gfc_error ("Argument X at %L to C_LOC shall have either "
+		 "the POINTER or the TARGET attribute", &x->where);
+      return false;
+    }
+
+  if (x->ts.type == BT_CHARACTER
+      && gfc_var_strlen (x) == 0)
+    {
+      gfc_error ("Argument X at %L to C_LOC shall be not be a zero-sized "
+		 "string", &x->where);
+      return false;
+    }
+
+  if (!is_c_interoperable (x, &msg, true, false))
+    {
+      if (x->ts.type == BT_CLASS)
+	{
+	  gfc_error ("Argument at %L to C_LOC shall not be polymorphic",
+		     &x->where);
+	  return false;
+	}
+
+      if (x->rank
+	  && !gfc_notify_std (GFC_STD_F2008_TS,
+			      "Noninteroperable array at %L as"
+			      " argument to C_LOC: %s", &x->where, msg))
+	  return false;
+    }
+  else if (x->rank > 0 && gfc_notification_std (GFC_STD_F2008))
+    {
+      gfc_array_ref *ar = gfc_find_array_ref (x);
+
+      if (ar->as->type != AS_EXPLICIT && ar->as->type != AS_ASSUMED_SIZE
+	  && !attr.allocatable
+	  && !gfc_notify_std (GFC_STD_F2008,
+			      "Array of interoperable type at %L "
+			      "to C_LOC which is nonallocatable and neither "
+			      "assumed size nor explicit size", &x->where))
+	return false;
+      else if (ar->type != AR_FULL
+	       && !gfc_notify_std (GFC_STD_F2008, "Array section at %L "
+				   "to C_LOC", &x->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_sleep_sub (gfc_expr *seconds)
+{
+  if (!type_check (seconds, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (seconds, 0))
+    return false;
+
+  return true;
+}
+
+bool
+gfc_check_sngl (gfc_expr *a)
+{
+  if (!type_check (a, 0, BT_REAL))
+    return false;
+
+  if ((a->ts.kind != gfc_default_double_kind)
+      && !gfc_notify_std (GFC_STD_GNU, "non double precision "
+			  "REAL argument to %s intrinsic at %L",
+			  gfc_current_intrinsic, &a->where))
+    return false;
+
+  return true;
+}
+
+bool
+gfc_check_spread (gfc_expr *source, gfc_expr *dim, gfc_expr *ncopies)
+{
+  if (source->rank >= GFC_MAX_DIMENSIONS)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be less "
+		 "than rank %d", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &source->where, GFC_MAX_DIMENSIONS);
+
+      return false;
+    }
+
+  if (dim == NULL)
+    return false;
+
+  if (!dim_check (dim, 1, false))
+    return false;
+
+  /* dim_rank_check() does not apply here.  */
+  if (dim
+      && dim->expr_type == EXPR_CONSTANT
+      && (mpz_cmp_ui (dim->value.integer, 1) < 0
+	  || mpz_cmp_ui (dim->value.integer, source->rank + 1) > 0))
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L is not a valid "
+		 "dimension index", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &dim->where);
+      return false;
+    }
+
+  if (!type_check (ncopies, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (ncopies, 2))
+    return false;
+
+  return true;
+}
+
+
+/* Functions for checking FGETC, FPUTC, FGET and FPUT (subroutines and
+   functions).  */
+
+bool
+gfc_check_fgetputc_sub (gfc_expr *unit, gfc_expr *c, gfc_expr *status)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (c, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (c, 1, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER)
+      || !kind_value_check (status, 2, gfc_default_integer_kind)
+      || !scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fgetputc (gfc_expr *unit, gfc_expr *c)
+{
+  return gfc_check_fgetputc_sub (unit, c, NULL);
+}
+
+
+bool
+gfc_check_fgetput_sub (gfc_expr *c, gfc_expr *status)
+{
+  if (!type_check (c, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (c, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 1, BT_INTEGER)
+      || !kind_value_check (status, 1, gfc_default_integer_kind)
+      || !scalar_check (status, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fgetput (gfc_expr *c)
+{
+  return gfc_check_fgetput_sub (c, NULL);
+}
+
+
+bool
+gfc_check_fseek_sub (gfc_expr *unit, gfc_expr *offset, gfc_expr *whence, gfc_expr *status)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (offset, 1, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (offset, 1))
+    return false;
+
+  if (!type_check (whence, 2, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (whence, 2))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 3, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (status, 3, 4))
+    return false;
+
+  if (!scalar_check (status, 3))
+    return false;
+
+  return true;
+}
+
+
+
+bool
+gfc_check_fstat (gfc_expr *unit, gfc_expr *array)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (array, 1, BT_INTEGER)
+      || !kind_value_check (unit, 0, gfc_default_integer_kind))
+    return false;
+
+  if (!array_check (array, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fstat_sub (gfc_expr *unit, gfc_expr *array, gfc_expr *status)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (array, 1, BT_INTEGER)
+      || !kind_value_check (array, 1, gfc_default_integer_kind))
+    return false;
+
+  if (!array_check (array, 1))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER)
+      || !kind_value_check (status, 2, gfc_default_integer_kind))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ftell (gfc_expr *unit)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ftell_sub (gfc_expr *unit, gfc_expr *offset)
+{
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (offset, 1, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (offset, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_stat (gfc_expr *name, gfc_expr *array)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (array, 1, BT_INTEGER)
+      || !kind_value_check (array, 1, gfc_default_integer_kind))
+    return false;
+
+  if (!array_check (array, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_stat_sub (gfc_expr *name, gfc_expr *array, gfc_expr *status)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (!type_check (array, 1, BT_INTEGER)
+      || !kind_value_check (array, 1, gfc_default_integer_kind))
+    return false;
+
+  if (!array_check (array, 1))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER)
+      || !kind_value_check (array, 1, gfc_default_integer_kind))
+    return false;
+
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_image_index (gfc_expr *coarray, gfc_expr *sub)
+{
+  mpz_t nelems;
+
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %C, use %<-fcoarray=%> to enable");
+      return false;
+    }
+
+  if (!coarray_check (coarray, 0))
+    return false;
+
+  if (sub->rank != 1)
+    {
+      gfc_error ("%s argument to IMAGE_INDEX must be a rank one array at %L",
+                gfc_current_intrinsic_arg[1]->name, &sub->where);
+      return false;
+    }
+
+  if (gfc_array_size (sub, &nelems))
+    {
+      int corank = gfc_get_corank (coarray);
+
+      if (mpz_cmp_ui (nelems, corank) != 0)
+	{
+	  gfc_error ("The number of array elements of the SUB argument to "
+		     "IMAGE_INDEX at %L shall be %d (corank) not %d",
+		     &sub->where, corank, (int) mpz_get_si (nelems));
+	  mpz_clear (nelems);
+	  return false;
+	}
+      mpz_clear (nelems);
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_num_images (gfc_expr *distance, gfc_expr *failed)
+{
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %C, use %<-fcoarray=%> to enable");
+      return false;
+    }
+
+  if (distance)
+    {
+      if (!type_check (distance, 0, BT_INTEGER))
+	return false;
+
+      if (!nonnegative_check ("DISTANCE", distance))
+	return false;
+
+      if (!scalar_check (distance, 0))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008_TS, "DISTANCE= argument to "
+			   "NUM_IMAGES at %L", &distance->where))
+	return false;
+    }
+
+   if (failed)
+    {
+      if (!type_check (failed, 1, BT_LOGICAL))
+	return false;
+
+      if (!scalar_check (failed, 1))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008_TS, "FAILED= argument to "
+			   "NUM_IMAGES at %L", &failed->where))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_this_image (gfc_expr *coarray, gfc_expr *dim, gfc_expr *distance)
+{
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %C, use %<-fcoarray=%> to enable");
+      return false;
+    }
+
+  if (coarray == NULL && dim == NULL && distance == NULL)
+    return true;
+
+  if (dim != NULL && coarray == NULL)
+    {
+      gfc_error ("DIM argument without COARRAY argument not allowed for "
+		 "THIS_IMAGE intrinsic at %L", &dim->where);
+      return false;
+    }
+
+  if (distance && (coarray || dim))
+    {
+      gfc_error ("The DISTANCE argument may not be specified together with the "
+		 "COARRAY or DIM argument in intrinsic at %L",
+		 &distance->where);
+      return false;
+    }
+
+  /* Assume that we have "this_image (distance)".  */
+  if (coarray && !gfc_is_coarray (coarray) && coarray->ts.type == BT_INTEGER)
+    {
+      if (dim)
+	{
+	  gfc_error ("Unexpected DIM argument with noncoarray argument at %L",
+		     &coarray->where);
+	  return false;
+	}
+      distance = coarray;
+    }
+
+  if (distance)
+    {
+      if (!type_check (distance, 2, BT_INTEGER))
+	return false;
+
+      if (!nonnegative_check ("DISTANCE", distance))
+	return false;
+
+      if (!scalar_check (distance, 2))
+	return false;
+
+      if (!gfc_notify_std (GFC_STD_F2008_TS, "DISTANCE= argument to "
+			   "THIS_IMAGE at %L", &distance->where))
+	return false;
+
+      return true;
+    }
+
+  if (!coarray_check (coarray, 0))
+    return false;
+
+  if (dim != NULL)
+    {
+      if (!dim_check (dim, 1, false))
+       return false;
+
+      if (!dim_corank_check (dim, coarray))
+       return false;
+    }
+
+  return true;
+}
+
+/* Calculate the sizes for transfer, used by gfc_check_transfer and also
+   by gfc_simplify_transfer.  Return false if we cannot do so.  */
+
+bool
+gfc_calculate_transfer_sizes (gfc_expr *source, gfc_expr *mold, gfc_expr *size,
+			      size_t *source_size, size_t *result_size,
+			      size_t *result_length_p)
+{
+  size_t result_elt_size;
+
+  if (source->expr_type == EXPR_FUNCTION)
+    return false;
+
+  if (size && size->expr_type != EXPR_CONSTANT)
+    return false;
+
+  /* Calculate the size of the source.  */
+  *source_size = gfc_target_expr_size (source);
+  if (*source_size == 0)
+    return false;
+
+  /* Determine the size of the element.  */
+  result_elt_size = gfc_element_size (mold);
+  if (result_elt_size == 0)
+    return false;
+
+  if (mold->expr_type == EXPR_ARRAY || mold->rank || size)
+    {
+      int result_length;
+
+      if (size)
+	result_length = (size_t)mpz_get_ui (size->value.integer);
+      else
+	{
+	  result_length = *source_size / result_elt_size;
+	  if (result_length * result_elt_size < *source_size)
+	    result_length += 1;
+	}
+
+      *result_size = result_length * result_elt_size;
+      if (result_length_p)
+	*result_length_p = result_length;
+    }
+  else
+    *result_size = result_elt_size;
+
+  return true;
+}
+
+
+bool
+gfc_check_transfer (gfc_expr *source, gfc_expr *mold, gfc_expr *size)
+{
+  size_t source_size;
+  size_t result_size;
+
+  if (mold->ts.type == BT_HOLLERITH)
+    {
+      gfc_error ("%<MOLD%> argument of %<TRANSFER%> intrinsic at %L must not be"
+                 " %s", &mold->where, gfc_basic_typename (BT_HOLLERITH));
+      return false;
+    }
+
+  if (size != NULL)
+    {
+      if (!type_check (size, 2, BT_INTEGER))
+	return false;
+
+      if (!scalar_check (size, 2))
+	return false;
+
+      if (!nonoptional_check (size, 2))
+	return false;
+    }
+
+  if (!warn_surprising)
+    return true;
+
+  /* If we can't calculate the sizes, we cannot check any more.
+     Return true for that case.  */
+
+  if (!gfc_calculate_transfer_sizes (source, mold, size, &source_size,
+				     &result_size, NULL))
+    return true;
+
+  if (source_size < result_size)
+    gfc_warning (OPT_Wsurprising,
+		 "Intrinsic TRANSFER at %L has partly undefined result: "
+		 "source size %ld < result size %ld", &source->where,
+		 (long) source_size, (long) result_size);
+
+  return true;
+}
+
+
+bool
+gfc_check_transpose (gfc_expr *matrix)
+{
+  if (!rank_check (matrix, 0, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ubound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind)
+{
+  if (!array_check (array, 0))
+    return false;
+
+  if (!dim_check (dim, 1, false))
+    return false;
+
+  if (!dim_rank_check (dim, array, 0))
+    return false;
+
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ucobound (gfc_expr *coarray, gfc_expr *dim, gfc_expr *kind)
+{
+  if (flag_coarray == GFC_FCOARRAY_NONE)
+    {
+      gfc_fatal_error ("Coarrays disabled at %C, use %<-fcoarray=%> to enable");
+      return false;
+    }
+
+  if (!coarray_check (coarray, 0))
+    return false;
+
+  if (dim != NULL)
+    {
+      if (!dim_check (dim, 1, false))
+        return false;
+
+      if (!dim_corank_check (dim, coarray))
+        return false;
+    }
+
+  if (!kind_check (kind, 2, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_unpack (gfc_expr *vector, gfc_expr *mask, gfc_expr *field)
+{
+  mpz_t vector_size;
+
+  if (!rank_check (vector, 0, 1))
+    return false;
+
+  if (!array_check (mask, 1))
+    return false;
+
+  if (!type_check (mask, 1, BT_LOGICAL))
+    return false;
+
+  if (!same_type_check (vector, 0, field, 2))
+    return false;
+
+  if (mask->expr_type == EXPR_ARRAY
+      && gfc_array_size (vector, &vector_size))
+    {
+      int mask_true_count = 0;
+      gfc_constructor *mask_ctor;
+      mask_ctor = gfc_constructor_first (mask->value.constructor);
+      while (mask_ctor)
+	{
+	  if (mask_ctor->expr->expr_type != EXPR_CONSTANT)
+	    {
+	      mask_true_count = 0;
+	      break;
+	    }
+
+	  if (mask_ctor->expr->value.logical)
+	    mask_true_count++;
+
+	  mask_ctor = gfc_constructor_next (mask_ctor);
+	}
+
+      if (mpz_get_si (vector_size) < mask_true_count)
+	{
+	  gfc_error ("%qs argument of %qs intrinsic at %L must "
+		     "provide at least as many elements as there "
+		     "are .TRUE. values in %qs (%ld/%d)",
+		     gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		     &vector->where, gfc_current_intrinsic_arg[1]->name,
+		     mpz_get_si (vector_size), mask_true_count);
+	  return false;
+	}
+
+      mpz_clear (vector_size);
+    }
+
+  if (mask->rank != field->rank && field->rank != 0)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must have "
+		 "the same rank as %qs or be a scalar",
+		 gfc_current_intrinsic_arg[2]->name, gfc_current_intrinsic,
+		 &field->where, gfc_current_intrinsic_arg[1]->name);
+      return false;
+    }
+
+  if (mask->rank == field->rank)
+    {
+      int i;
+      for (i = 0; i < field->rank; i++)
+	if (! identical_dimen_shape (mask, i, field, i))
+	{
+	  gfc_error ("%qs and %qs arguments of %qs intrinsic at %L "
+		     "must have identical shape.",
+		     gfc_current_intrinsic_arg[2]->name,
+		     gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		     &field->where);
+	}
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_verify (gfc_expr *x, gfc_expr *y, gfc_expr *z, gfc_expr *kind)
+{
+  if (!type_check (x, 0, BT_CHARACTER))
+    return false;
+
+  if (!same_type_check (x, 0, y, 1))
+    return false;
+
+  if (z != NULL && !type_check (z, 2, BT_LOGICAL))
+    return false;
+
+  if (!kind_check (kind, 3, BT_INTEGER))
+    return false;
+  if (kind && !gfc_notify_std (GFC_STD_F2003, "%qs intrinsic "
+			       "with KIND argument at %L",
+			       gfc_current_intrinsic, &kind->where))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_trim (gfc_expr *x)
+{
+  if (!type_check (x, 0, BT_CHARACTER))
+    return false;
+
+  if (!scalar_check (x, 0))
+    return false;
+
+   return true;
+}
+
+
+bool
+gfc_check_ttynam (gfc_expr *unit)
+{
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+/************* Check functions for intrinsic subroutines *************/
+
+bool
+gfc_check_cpu_time (gfc_expr *time)
+{
+  if (!scalar_check (time, 0))
+    return false;
+
+  if (!type_check (time, 0, BT_REAL))
+    return false;
+
+  if (!variable_check (time, 0, false))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_date_and_time (gfc_expr *date, gfc_expr *time,
+			 gfc_expr *zone, gfc_expr *values)
+{
+  if (date != NULL)
+    {
+      if (!type_check (date, 0, BT_CHARACTER))
+	return false;
+      if (!kind_value_check (date, 0, gfc_default_character_kind))
+	return false;
+      if (!scalar_check (date, 0))
+	return false;
+      if (!variable_check (date, 0, false))
+	return false;
+    }
+
+  if (time != NULL)
+    {
+      if (!type_check (time, 1, BT_CHARACTER))
+	return false;
+      if (!kind_value_check (time, 1, gfc_default_character_kind))
+	return false;
+      if (!scalar_check (time, 1))
+	return false;
+      if (!variable_check (time, 1, false))
+	return false;
+    }
+
+  if (zone != NULL)
+    {
+      if (!type_check (zone, 2, BT_CHARACTER))
+	return false;
+      if (!kind_value_check (zone, 2, gfc_default_character_kind))
+	return false;
+      if (!scalar_check (zone, 2))
+	return false;
+      if (!variable_check (zone, 2, false))
+	return false;
+    }
+
+  if (values != NULL)
+    {
+      if (!type_check (values, 3, BT_INTEGER))
+	return false;
+      if (!array_check (values, 3))
+	return false;
+      if (!rank_check (values, 3, 1))
+	return false;
+      if (!variable_check (values, 3, false))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_mvbits (gfc_expr *from, gfc_expr *frompos, gfc_expr *len,
+		  gfc_expr *to, gfc_expr *topos)
+{
+  if (!type_check (from, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (frompos, 1, BT_INTEGER))
+    return false;
+
+  if (!type_check (len, 2, BT_INTEGER))
+    return false;
+
+  if (!same_type_check (from, 0, to, 3))
+    return false;
+
+  if (!variable_check (to, 3, false))
+    return false;
+
+  if (!type_check (topos, 4, BT_INTEGER))
+    return false;
+
+  if (!nonnegative_check ("frompos", frompos))
+    return false;
+
+  if (!nonnegative_check ("topos", topos))
+    return false;
+
+  if (!nonnegative_check ("len", len))
+    return false;
+
+  if (!less_than_bitsize2 ("from", from, "frompos", frompos, "len", len))
+    return false;
+
+  if (!less_than_bitsize2 ("to", to, "topos", topos, "len", len))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_random_number (gfc_expr *harvest)
+{
+  if (!type_check (harvest, 0, BT_REAL))
+    return false;
+
+  if (!variable_check (harvest, 0, false))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_random_seed (gfc_expr *size, gfc_expr *put, gfc_expr *get)
+{
+  unsigned int nargs = 0, seed_size;
+  locus *where = NULL;
+  mpz_t put_size, get_size;
+
+  /* Keep the number of bytes in sync with master_state in
+     libgfortran/intrinsics/random.c. +1 due to the integer p which is
+     part of the state too.  */
+  seed_size = 128 / gfc_default_integer_kind + 1;
+
+  if (size != NULL)
+    {
+      if (size->expr_type != EXPR_VARIABLE
+	  || !size->symtree->n.sym->attr.optional)
+	nargs++;
+
+      if (!scalar_check (size, 0))
+	return false;
+
+      if (!type_check (size, 0, BT_INTEGER))
+	return false;
+
+      if (!variable_check (size, 0, false))
+	return false;
+
+      if (!kind_value_check (size, 0, gfc_default_integer_kind))
+	return false;
+    }
+
+  if (put != NULL)
+    {
+      if (put->expr_type != EXPR_VARIABLE
+	  || !put->symtree->n.sym->attr.optional)
+	{
+	  nargs++;
+	  where = &put->where;
+	}
+
+      if (!array_check (put, 1))
+	return false;
+
+      if (!rank_check (put, 1, 1))
+	return false;
+
+      if (!type_check (put, 1, BT_INTEGER))
+	return false;
+
+      if (!kind_value_check (put, 1, gfc_default_integer_kind))
+	return false;
+
+      if (gfc_array_size (put, &put_size)
+	  && mpz_get_ui (put_size) < seed_size)
+	gfc_error ("Size of %qs argument of %qs intrinsic at %L "
+		   "too small (%i/%i)",
+		   gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		   where, (int) mpz_get_ui (put_size), seed_size);
+    }
+
+  if (get != NULL)
+    {
+      if (get->expr_type != EXPR_VARIABLE
+	  || !get->symtree->n.sym->attr.optional)
+	{
+	  nargs++;
+	  where = &get->where;
+	}
+
+      if (!array_check (get, 2))
+	return false;
+
+      if (!rank_check (get, 2, 1))
+	return false;
+
+      if (!type_check (get, 2, BT_INTEGER))
+	return false;
+
+      if (!variable_check (get, 2, false))
+	return false;
+
+      if (!kind_value_check (get, 2, gfc_default_integer_kind))
+	return false;
+
+       if (gfc_array_size (get, &get_size)
+	   && mpz_get_ui (get_size) < seed_size)
+	gfc_error ("Size of %qs argument of %qs intrinsic at %L "
+		   "too small (%i/%i)",
+		   gfc_current_intrinsic_arg[2]->name, gfc_current_intrinsic,
+		   where, (int) mpz_get_ui (get_size), seed_size);
+    }
+
+  /* RANDOM_SEED may not have more than one non-optional argument.  */
+  if (nargs > 1)
+    gfc_error ("Too many arguments to %s at %L", gfc_current_intrinsic, where);
+
+  return true;
+}
+
+bool
+gfc_check_fe_runtime_error (gfc_actual_arglist *a)
+{
+  gfc_expr *e;
+  int len, i;
+  int num_percent, nargs;
+
+  e = a->expr;
+  if (e->expr_type != EXPR_CONSTANT)
+    return true;
+
+  len = e->value.character.length;
+  if (e->value.character.string[len-1] != '\0')
+    gfc_internal_error ("fe_runtime_error string must be null terminated");
+
+  num_percent = 0;
+  for (i=0; i<len-1; i++)
+    if (e->value.character.string[i] == '%')
+      num_percent ++;
+
+  nargs = 0;
+  for (; a; a = a->next)
+    nargs ++;
+
+  if (nargs -1 != num_percent)
+    gfc_internal_error ("fe_runtime_error: Wrong number of arguments (%d instead of %d)",
+			nargs, num_percent++);
+
+  return true;
+}
+
+bool
+gfc_check_second_sub (gfc_expr *time)
+{
+  if (!scalar_check (time, 0))
+    return false;
+
+  if (!type_check (time, 0, BT_REAL))
+    return false;
+
+  if (!kind_value_check (time, 0, 4))
+    return false;
+
+  return true;
+}
+
+
+/* COUNT and COUNT_MAX of SYSTEM_CLOCK are scalar, default-kind integer
+   variables in Fortran 95.  In Fortran 2003 and later, they can be of any
+   kind, and COUNT_RATE can be of type real.  Note, count, count_rate, and
+   count_max are all optional arguments */
+
+bool
+gfc_check_system_clock (gfc_expr *count, gfc_expr *count_rate,
+			gfc_expr *count_max)
+{
+  if (count != NULL)
+    {
+      if (!scalar_check (count, 0))
+	return false;
+
+      if (!type_check (count, 0, BT_INTEGER))
+	return false;
+
+      if (count->ts.kind != gfc_default_integer_kind
+	  && !gfc_notify_std (GFC_STD_F2003, "COUNT argument to "
+			      "SYSTEM_CLOCK at %L has non-default kind",
+			      &count->where))
+	return false;
+
+      if (!variable_check (count, 0, false))
+	return false;
+    }
+
+  if (count_rate != NULL)
+    {
+      if (!scalar_check (count_rate, 1))
+	return false;
+
+      if (!variable_check (count_rate, 1, false))
+	return false;
+
+      if (count_rate->ts.type == BT_REAL)
+	{
+	  if (!gfc_notify_std (GFC_STD_F2003, "Real COUNT_RATE argument to "
+			       "SYSTEM_CLOCK at %L", &count_rate->where))
+	    return false;
+	}
+      else
+	{
+	  if (!type_check (count_rate, 1, BT_INTEGER))
+	    return false;
+
+	  if (count_rate->ts.kind != gfc_default_integer_kind
+	      && !gfc_notify_std (GFC_STD_F2003, "COUNT_RATE argument to "
+				  "SYSTEM_CLOCK at %L has non-default kind",
+				  &count_rate->where))
+	    return false;
+	}
+
+    }
+
+  if (count_max != NULL)
+    {
+      if (!scalar_check (count_max, 2))
+	return false;
+
+      if (!type_check (count_max, 2, BT_INTEGER))
+	return false;
+
+      if (count_max->ts.kind != gfc_default_integer_kind
+	  && !gfc_notify_std (GFC_STD_F2003, "COUNT_MAX argument to "
+			      "SYSTEM_CLOCK at %L has non-default kind",
+			      &count_max->where))
+	return false;
+
+      if (!variable_check (count_max, 2, false))
+	return false;
+    }
+
+  return true;
+}
+
+
+bool
+gfc_check_irand (gfc_expr *x)
+{
+  if (x == NULL)
+    return true;
+
+  if (!scalar_check (x, 0))
+    return false;
+
+  if (!type_check (x, 0, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (x, 0, 4))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_alarm_sub (gfc_expr *seconds, gfc_expr *handler, gfc_expr *status)
+{
+  if (!scalar_check (seconds, 0))
+    return false;
+  if (!type_check (seconds, 0, BT_INTEGER))
+    return false;
+
+  if (!int_or_proc_check (handler, 1))
+    return false;
+  if (handler->ts.type == BT_INTEGER && !scalar_check (handler, 1))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!scalar_check (status, 2))
+    return false;
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+  if (!kind_value_check (status, 2, gfc_default_integer_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_rand (gfc_expr *x)
+{
+  if (x == NULL)
+    return true;
+
+  if (!scalar_check (x, 0))
+    return false;
+
+  if (!type_check (x, 0, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (x, 0, 4))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_srand (gfc_expr *x)
+{
+  if (!scalar_check (x, 0))
+    return false;
+
+  if (!type_check (x, 0, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (x, 0, 4))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ctime_sub (gfc_expr *time, gfc_expr *result)
+{
+  if (!scalar_check (time, 0))
+    return false;
+  if (!type_check (time, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (result, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (result, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_dtime_etime (gfc_expr *x)
+{
+  if (!array_check (x, 0))
+    return false;
+
+  if (!rank_check (x, 0, 1))
+    return false;
+
+  if (!variable_check (x, 0, false))
+    return false;
+
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+
+  if (!kind_value_check (x, 0, 4))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_dtime_etime_sub (gfc_expr *values, gfc_expr *time)
+{
+  if (!array_check (values, 0))
+    return false;
+
+  if (!rank_check (values, 0, 1))
+    return false;
+
+  if (!variable_check (values, 0, false))
+    return false;
+
+  if (!type_check (values, 0, BT_REAL))
+    return false;
+
+  if (!kind_value_check (values, 0, 4))
+    return false;
+
+  if (!scalar_check (time, 1))
+    return false;
+
+  if (!type_check (time, 1, BT_REAL))
+    return false;
+
+  if (!kind_value_check (time, 1, 4))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_fdate_sub (gfc_expr *date)
+{
+  if (!type_check (date, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (date, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_gerror (gfc_expr *msg)
+{
+  if (!type_check (msg, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (msg, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_getcwd_sub (gfc_expr *cwd, gfc_expr *status)
+{
+  if (!type_check (cwd, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (cwd, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!scalar_check (status, 1))
+    return false;
+
+  if (!type_check (status, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_getarg (gfc_expr *pos, gfc_expr *value)
+{
+  if (!type_check (pos, 0, BT_INTEGER))
+    return false;
+
+  if (pos->ts.kind > gfc_default_integer_kind)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be of a kind "
+		 "not wider than the default kind (%d)",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &pos->where, gfc_default_integer_kind);
+      return false;
+    }
+
+  if (!type_check (value, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (value, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_getlog (gfc_expr *msg)
+{
+  if (!type_check (msg, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (msg, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_exit (gfc_expr *status)
+{
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (status, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_flush (gfc_expr *unit)
+{
+  if (unit == NULL)
+    return true;
+
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_free (gfc_expr *i)
+{
+  if (!type_check (i, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (i, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_hostnm (gfc_expr *name)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_hostnm_sub (gfc_expr *name, gfc_expr *status)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!scalar_check (status, 1))
+    return false;
+
+  if (!type_check (status, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_itime_idate (gfc_expr *values)
+{
+  if (!array_check (values, 0))
+    return false;
+
+  if (!rank_check (values, 0, 1))
+    return false;
+
+  if (!variable_check (values, 0, false))
+    return false;
+
+  if (!type_check (values, 0, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (values, 0, gfc_default_integer_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ltime_gmtime (gfc_expr *time, gfc_expr *values)
+{
+  if (!type_check (time, 0, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (time, 0, gfc_default_integer_kind))
+    return false;
+
+  if (!scalar_check (time, 0))
+    return false;
+
+  if (!array_check (values, 1))
+    return false;
+
+  if (!rank_check (values, 1, 1))
+    return false;
+
+  if (!variable_check (values, 1, false))
+    return false;
+
+  if (!type_check (values, 1, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (values, 1, gfc_default_integer_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_ttynam_sub (gfc_expr *unit, gfc_expr *name)
+{
+  if (!scalar_check (unit, 0))
+    return false;
+
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!type_check (name, 1, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 1, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_isatty (gfc_expr *unit)
+{
+  if (unit == NULL)
+    return false;
+
+  if (!type_check (unit, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (unit, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_isnan (gfc_expr *x)
+{
+  if (!type_check (x, 0, BT_REAL))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_perror (gfc_expr *string)
+{
+  if (!type_check (string, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (string, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_umask (gfc_expr *mask)
+{
+  if (!type_check (mask, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (mask, 0))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_umask_sub (gfc_expr *mask, gfc_expr *old)
+{
+  if (!type_check (mask, 0, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (mask, 0))
+    return false;
+
+  if (old == NULL)
+    return true;
+
+  if (!scalar_check (old, 1))
+    return false;
+
+  if (!type_check (old, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_unlink (gfc_expr *name)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_unlink_sub (gfc_expr *name, gfc_expr *status)
+{
+  if (!type_check (name, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (name, 0, gfc_default_character_kind))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!scalar_check (status, 1))
+    return false;
+
+  if (!type_check (status, 1, BT_INTEGER))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_signal (gfc_expr *number, gfc_expr *handler)
+{
+  if (!scalar_check (number, 0))
+    return false;
+  if (!type_check (number, 0, BT_INTEGER))
+    return false;
+
+  if (!int_or_proc_check (handler, 1))
+    return false;
+  if (handler->ts.type == BT_INTEGER && !scalar_check (handler, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_signal_sub (gfc_expr *number, gfc_expr *handler, gfc_expr *status)
+{
+  if (!scalar_check (number, 0))
+    return false;
+  if (!type_check (number, 0, BT_INTEGER))
+    return false;
+
+  if (!int_or_proc_check (handler, 1))
+    return false;
+  if (handler->ts.type == BT_INTEGER && !scalar_check (handler, 1))
+    return false;
+
+  if (status == NULL)
+    return true;
+
+  if (!type_check (status, 2, BT_INTEGER))
+    return false;
+  if (!scalar_check (status, 2))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_system_sub (gfc_expr *cmd, gfc_expr *status)
+{
+  if (!type_check (cmd, 0, BT_CHARACTER))
+    return false;
+  if (!kind_value_check (cmd, 0, gfc_default_character_kind))
+    return false;
+
+  if (!scalar_check (status, 1))
+    return false;
+
+  if (!type_check (status, 1, BT_INTEGER))
+    return false;
+
+  if (!kind_value_check (status, 1, gfc_default_integer_kind))
+    return false;
+
+  return true;
+}
+
+
+/* This is used for the GNU intrinsics AND, OR and XOR.  */
+bool
+gfc_check_and (gfc_expr *i, gfc_expr *j)
+{
+  if (i->ts.type != BT_INTEGER && i->ts.type != BT_LOGICAL)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be INTEGER "
+		 "or LOGICAL", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &i->where);
+      return false;
+    }
+
+  if (j->ts.type != BT_INTEGER && j->ts.type != BT_LOGICAL)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be INTEGER "
+		 "or LOGICAL", gfc_current_intrinsic_arg[1]->name,
+		 gfc_current_intrinsic, &j->where);
+      return false;
+    }
+
+  if (i->ts.type != j->ts.type)
+    {
+      gfc_error ("%qs and %qs arguments of %qs intrinsic at %L must "
+		 "have the same type", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &j->where);
+      return false;
+    }
+
+  if (!scalar_check (i, 0))
+    return false;
+
+  if (!scalar_check (j, 1))
+    return false;
+
+  return true;
+}
+
+
+bool
+gfc_check_storage_size (gfc_expr *a, gfc_expr *kind)
+{
+
+  if (a->expr_type == EXPR_NULL)
+    {
+      gfc_error ("Intrinsic function NULL at %L cannot be an actual "
+		 "argument to STORAGE_SIZE, because it returns a "
+		 "disassociated pointer", &a->where);
+      return false;
+    }
+
+  if (a->ts.type == BT_ASSUMED)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be TYPE(*)",
+		 gfc_current_intrinsic_arg[0]->name, gfc_current_intrinsic,
+		 &a->where);
+      return false;
+    }
+
+  if (a->ts.type == BT_PROCEDURE)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L shall not be a "
+		 "procedure", gfc_current_intrinsic_arg[0]->name,
+		 gfc_current_intrinsic, &a->where);
+      return false;
+    }
+
+  if (kind == NULL)
+    return true;
+
+  if (!type_check (kind, 1, BT_INTEGER))
+    return false;
+
+  if (!scalar_check (kind, 1))
+    return false;
+
+  if (kind->expr_type != EXPR_CONSTANT)
+    {
+      gfc_error ("%qs argument of %qs intrinsic at %L must be a constant",
+		 gfc_current_intrinsic_arg[1]->name, gfc_current_intrinsic,
+		 &kind->where);
+      return false;
+    }
+
+  return true;
+}