--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/fortran/trans-const.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,419 @@
+/* Translation of constants
+   Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   Contributed by Paul Brook
+
+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/>.  */
+
+/* trans-const.c -- convert constant values */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tree.h"
+#include "gfortran.h"
+#include "trans.h"
+#include "diagnostic-core.h"	/* For fatal_error.  */
+#include "fold-const.h"
+#include "stor-layout.h"
+#include "realmpfr.h"
+#include "trans-const.h"
+#include "trans-types.h"
+#include "target-memory.h"
+
+tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1];
+
+/* Build a constant with given type from an int_cst.  */
+
+tree
+gfc_build_const (tree type, tree intval)
+{
+  tree val;
+  tree zero;
+
+  switch (TREE_CODE (type))
+    {
+    case INTEGER_TYPE:
+      val = convert (type, intval);
+      break;
+
+    case REAL_TYPE:
+      val = build_real_from_int_cst (type, intval);
+      break;
+
+    case COMPLEX_TYPE:
+      val = build_real_from_int_cst (TREE_TYPE (type), intval);
+      zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node);
+      val = build_complex (type, val, zero);
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+  return val;
+}
+
+/* Build a string constant with C char type.  */
+
+tree
+gfc_build_string_const (int length, const char *s)
+{
+  tree str;
+  tree len;
+
+  str = build_string (length, s);
+  len = size_int (length);
+  TREE_TYPE (str) =
+    build_array_type (gfc_character1_type_node,
+		      build_range_type (gfc_charlen_type_node,
+					size_one_node, len));
+  TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
+  return str;
+}
+
+
+/* Build a string constant with a type given by its kind; take care of
+   non-default character kinds.  */
+
+tree
+gfc_build_wide_string_const (int kind, int length, const gfc_char_t *string)
+{
+  int i;
+  tree str, len;
+  size_t size;
+  char *s;
+
+  i = gfc_validate_kind (BT_CHARACTER, kind, false);
+  size = length * gfc_character_kinds[i].bit_size / 8;
+
+  s = XCNEWVAR (char, size);
+  gfc_encode_character (kind, length, string, (unsigned char *) s, size);
+
+  str = build_string (size, s);
+  free (s);
+
+  len = size_int (length);
+  TREE_TYPE (str) =
+    build_array_type (gfc_get_char_type (kind),
+		      build_range_type (gfc_charlen_type_node,
+					size_one_node, len));
+  TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
+  return str;
+}
+
+
+/* Build a Fortran character constant from a zero-terminated string.
+   There a two version of this function, one that translates the string
+   and one that doesn't.  */
+tree
+gfc_build_cstring_const (const char *string)
+{
+  return gfc_build_string_const (strlen (string) + 1, string);
+}
+
+tree
+gfc_build_localized_cstring_const (const char *msgid)
+{
+  const char *localized = _(msgid);
+  return gfc_build_string_const (strlen (localized) + 1, localized);
+}
+
+
+/* Return a string constant with the given length.  Used for static
+   initializers.  The constant will be padded or truncated to match 
+   length.  */
+
+tree
+gfc_conv_string_init (tree length, gfc_expr * expr)
+{
+  gfc_char_t *s;
+  HOST_WIDE_INT len;
+  int slen;
+  tree str;
+  bool free_s = false;
+
+  gcc_assert (expr->expr_type == EXPR_CONSTANT);
+  gcc_assert (expr->ts.type == BT_CHARACTER);
+  gcc_assert (tree_fits_uhwi_p (length));
+
+  len = TREE_INT_CST_LOW (length);
+  slen = expr->value.character.length;
+
+  if (len > slen)
+    {
+      s = gfc_get_wide_string (len);
+      memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
+      gfc_wide_memset (&s[slen], ' ', len - slen);
+      free_s = true;
+    }
+  else
+    s = expr->value.character.string;
+
+  str = gfc_build_wide_string_const (expr->ts.kind, len, s);
+
+  if (free_s)
+    free (s);
+
+  return str;
+}
+
+
+/* Create a tree node for the string length if it is constant.  */
+
+void
+gfc_conv_const_charlen (gfc_charlen * cl)
+{
+  if (!cl || cl->backend_decl)
+    return;
+
+  if (cl->length && cl->length->expr_type == EXPR_CONSTANT)
+    {
+      cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer,
+					       cl->length->ts.kind);
+      cl->backend_decl = fold_convert (gfc_charlen_type_node,
+					cl->backend_decl);
+    }
+}
+
+void
+gfc_init_constants (void)
+{
+  int n;
+
+  for (n = 0; n <= GFC_MAX_DIMENSIONS; n++)
+    gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n);
+}
+
+/* Converts a GMP integer into a backend tree node.  */
+
+tree
+gfc_conv_mpz_to_tree (mpz_t i, int kind)
+{
+  wide_int val = wi::from_mpz (gfc_get_int_type (kind), i, true);
+  return wide_int_to_tree (gfc_get_int_type (kind), val);
+}
+
+/* Converts a backend tree into a GMP integer.  */
+
+void
+gfc_conv_tree_to_mpz (mpz_t i, tree source)
+{
+  wi::to_mpz (wi::to_wide (source), i, TYPE_SIGN (TREE_TYPE (source)));
+}
+
+/* Converts a real constant into backend form.  */
+
+tree
+gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan)
+{
+  tree type;
+  int n;
+  REAL_VALUE_TYPE real;
+
+  n = gfc_validate_kind (BT_REAL, kind, false);
+  gcc_assert (gfc_real_kinds[n].radix == 2);
+
+  type = gfc_get_real_type (kind);
+  if (mpfr_nan_p (f) && is_snan)
+     real_from_string (&real, "SNaN");
+  else
+    real_from_mpfr (&real, f, type, GFC_RND_MODE);
+
+  return build_real (type, real);
+}
+
+/* Returns a real constant that is +Infinity if the target
+   supports infinities for this floating-point mode, and
+   +HUGE_VAL otherwise (the largest representable number).  */
+
+tree
+gfc_build_inf_or_huge (tree type, int kind)
+{
+  if (HONOR_INFINITIES (TYPE_MODE (type)))
+    {
+      REAL_VALUE_TYPE real;
+      real_inf (&real);
+      return build_real (type, real);
+    }
+  else
+    {
+      int k = gfc_validate_kind (BT_REAL, kind, false);
+      return gfc_conv_mpfr_to_tree (gfc_real_kinds[k].huge, kind, 0);
+    }
+}
+
+/* Returns a floating-point NaN of a given type.  */
+
+tree
+gfc_build_nan (tree type, const char *str)
+{
+  REAL_VALUE_TYPE real;
+  real_nan (&real, str, 1, TYPE_MODE (type));
+  return build_real (type, real);
+}
+
+/* Converts a backend tree into a real constant.  */
+
+void
+gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source)
+{
+  mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE);
+}
+
+/* Translate any literal constant to a tree.  Constants never have
+   pre or post chains.  Character literal constants are special
+   special because they have a value and a length, so they cannot be
+   returned as a single tree.  It is up to the caller to set the
+   length somewhere if necessary.
+
+   Returns the translated constant, or aborts if it gets a type it
+   can't handle.  */
+
+tree
+gfc_conv_constant_to_tree (gfc_expr * expr)
+{
+  tree res;
+
+  gcc_assert (expr->expr_type == EXPR_CONSTANT);
+
+  /* If it is has a prescribed memory representation, we build a string
+     constant and VIEW_CONVERT to its type.  */
+ 
+  switch (expr->ts.type)
+    {
+    case BT_INTEGER:
+      if (expr->representation.string)
+	return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
+			 gfc_get_int_type (expr->ts.kind),
+			 gfc_build_string_const (expr->representation.length,
+						 expr->representation.string));
+      else
+	return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind);
+
+    case BT_REAL:
+      if (expr->representation.string)
+	return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
+			 gfc_get_real_type (expr->ts.kind),
+			 gfc_build_string_const (expr->representation.length,
+						 expr->representation.string));
+      else
+	return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan);
+
+    case BT_LOGICAL:
+      if (expr->representation.string)
+	{
+	  tree tmp = fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
+			gfc_get_int_type (expr->ts.kind),
+			gfc_build_string_const (expr->representation.length,
+						expr->representation.string));
+	  if (!integer_zerop (tmp) && !integer_onep (tmp))
+	    gfc_warning (0, "Assigning value other than 0 or 1 to LOGICAL"
+			 " has undefined result at %L", &expr->where);
+	  return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp);
+	}
+      else
+	return build_int_cst (gfc_get_logical_type (expr->ts.kind),
+			      expr->value.logical);
+
+    case BT_COMPLEX:
+      if (expr->representation.string)
+	return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
+			 gfc_get_complex_type (expr->ts.kind),
+			 gfc_build_string_const (expr->representation.length,
+						 expr->representation.string));
+      else
+	{
+	  tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex),
+					  expr->ts.kind, expr->is_snan);
+	  tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex),
+					  expr->ts.kind, expr->is_snan);
+
+	  return build_complex (gfc_typenode_for_spec (&expr->ts),
+				real, imag);
+	}
+
+    case BT_CHARACTER:
+      res = gfc_build_wide_string_const (expr->ts.kind,
+					 expr->value.character.length,
+					 expr->value.character.string);
+      return res;
+
+    case BT_HOLLERITH:
+      return gfc_build_string_const (expr->representation.length,
+				     expr->representation.string);
+
+    default:
+      fatal_error (input_location,
+		   "gfc_conv_constant_to_tree(): invalid type: %s",
+		   gfc_typename (&expr->ts));
+    }
+}
+
+
+/* Like gfc_conv_constant_to_tree, but for a simplified expression.
+   We can handle character literal constants here as well.  */
+
+void
+gfc_conv_constant (gfc_se * se, gfc_expr * expr)
+{
+  gfc_ss *ss;
+
+  /* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR.  If
+     so, the expr_type will not yet be an EXPR_CONSTANT.  We need to make
+     it so here.  */
+  if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
+      && expr->ts.u.derived->attr.is_iso_c)
+    {
+      if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR 
+          || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
+        {
+          /* Create a new EXPR_CONSTANT expression for our local uses.  */
+          expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
+        }
+    }
+
+  if (expr->expr_type != EXPR_CONSTANT)
+    {
+      gfc_expr *e = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
+      gfc_error ("non-constant initialization expression at %L", &expr->where);
+      se->expr = gfc_conv_constant_to_tree (e);
+      return;
+    }
+
+  ss = se->ss;
+  if (ss != NULL)
+    {
+      gfc_ss_info *ss_info;
+
+      ss_info = ss->info;
+      gcc_assert (ss != gfc_ss_terminator);
+      gcc_assert (ss_info->type == GFC_SS_SCALAR);
+      gcc_assert (ss_info->expr == expr);
+
+      se->expr = ss_info->data.scalar.value;
+      se->string_length = ss_info->string_length;
+      gfc_advance_se_ss_chain (se);
+      return;
+    }
+
+  /* Translate the constant and put it in the simplifier structure.  */
+  se->expr = gfc_conv_constant_to_tree (expr);
+
+  /* If this is a CHARACTER string, set its length in the simplifier
+     structure, too.  */
+  if (expr->ts.type == BT_CHARACTER)
+    se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));
+}