Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 2090 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/fortran/trans.c b/gcc-4.9/gcc/fortran/trans.c
new file mode 100644
index 000000000..5961c267e
--- /dev/null
+++ b/gcc-4.9/gcc/fortran/trans.c
@@ -0,0 +1,2090 @@
+/* Code translation -- generate GCC trees from gfc_code.
+   Copyright (C) 2002-2014 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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tree.h"
+#include "gimple-expr.h"	/* For create_tmp_var_raw.  */
+#include "stringpool.h"
+#include "tree-iterator.h"
+#include "diagnostic-core.h"  /* For internal_error.  */
+#include "flags.h"
+#include "gfortran.h"
+#include "trans.h"
+#include "trans-stmt.h"
+#include "trans-array.h"
+#include "trans-types.h"
+#include "trans-const.h"
+
+/* Naming convention for backend interface code:
+
+   gfc_trans_*	translate gfc_code into STMT trees.
+
+   gfc_conv_*	expression conversion
+
+   gfc_get_*	get a backend tree representation of a decl or type  */
+
+static gfc_file *gfc_current_backend_file;
+
+const char gfc_msg_fault[] = N_("Array reference out of bounds");
+const char gfc_msg_wrong_return[] = N_("Incorrect function return value");
+
+
+/* Advance along TREE_CHAIN n times.  */
+
+tree
+gfc_advance_chain (tree t, int n)
+{
+  for (; n > 0; n--)
+    {
+      gcc_assert (t != NULL_TREE);
+      t = DECL_CHAIN (t);
+    }
+  return t;
+}
+
+
+/* Strip off a legitimate source ending from the input
+   string NAME of length LEN.  */
+
+static inline void
+remove_suffix (char *name, int len)
+{
+  int i;
+
+  for (i = 2; i < 8 && len > i; i++)
+    {
+      if (name[len - i] == '.')
+	{
+	  name[len - i] = '\0';
+	  break;
+	}
+    }
+}
+
+
+/* Creates a variable declaration with a given TYPE.  */
+
+tree
+gfc_create_var_np (tree type, const char *prefix)
+{
+  tree t;
+
+  t = create_tmp_var_raw (type, prefix);
+
+  /* No warnings for anonymous variables.  */
+  if (prefix == NULL)
+    TREE_NO_WARNING (t) = 1;
+
+  return t;
+}
+
+
+/* Like above, but also adds it to the current scope.  */
+
+tree
+gfc_create_var (tree type, const char *prefix)
+{
+  tree tmp;
+
+  tmp = gfc_create_var_np (type, prefix);
+
+  pushdecl (tmp);
+
+  return tmp;
+}
+
+
+/* If the expression is not constant, evaluate it now.  We assign the
+   result of the expression to an artificially created variable VAR, and
+   return a pointer to the VAR_DECL node for this variable.  */
+
+tree
+gfc_evaluate_now_loc (location_t loc, tree expr, stmtblock_t * pblock)
+{
+  tree var;
+
+  if (CONSTANT_CLASS_P (expr))
+    return expr;
+
+  var = gfc_create_var (TREE_TYPE (expr), NULL);
+  gfc_add_modify_loc (loc, pblock, var, expr);
+
+  return var;
+}
+
+
+tree
+gfc_evaluate_now (tree expr, stmtblock_t * pblock)
+{
+  return gfc_evaluate_now_loc (input_location, expr, pblock);
+}
+
+
+/* Build a MODIFY_EXPR node and add it to a given statement block PBLOCK.
+   A MODIFY_EXPR is an assignment:
+   LHS <- RHS.  */
+
+void
+gfc_add_modify_loc (location_t loc, stmtblock_t * pblock, tree lhs, tree rhs)
+{
+  tree tmp;
+
+#ifdef ENABLE_CHECKING
+  tree t1, t2;
+  t1 = TREE_TYPE (rhs);
+  t2 = TREE_TYPE (lhs);
+  /* Make sure that the types of the rhs and the lhs are the same
+     for scalar assignments.  We should probably have something
+     similar for aggregates, but right now removing that check just
+     breaks everything.  */
+  gcc_assert (t1 == t2
+	      || AGGREGATE_TYPE_P (TREE_TYPE (lhs)));
+#endif
+
+  tmp = fold_build2_loc (loc, MODIFY_EXPR, void_type_node, lhs,
+			 rhs);
+  gfc_add_expr_to_block (pblock, tmp);
+}
+
+
+void
+gfc_add_modify (stmtblock_t * pblock, tree lhs, tree rhs)
+{
+  gfc_add_modify_loc (input_location, pblock, lhs, rhs);
+}
+
+
+/* Create a new scope/binding level and initialize a block.  Care must be
+   taken when translating expressions as any temporaries will be placed in
+   the innermost scope.  */
+
+void
+gfc_start_block (stmtblock_t * block)
+{
+  /* Start a new binding level.  */
+  pushlevel ();
+  block->has_scope = 1;
+
+  /* The block is empty.  */
+  block->head = NULL_TREE;
+}
+
+
+/* Initialize a block without creating a new scope.  */
+
+void
+gfc_init_block (stmtblock_t * block)
+{
+  block->head = NULL_TREE;
+  block->has_scope = 0;
+}
+
+
+/* Sometimes we create a scope but it turns out that we don't actually
+   need it.  This function merges the scope of BLOCK with its parent.
+   Only variable decls will be merged, you still need to add the code.  */
+
+void
+gfc_merge_block_scope (stmtblock_t * block)
+{
+  tree decl;
+  tree next;
+
+  gcc_assert (block->has_scope);
+  block->has_scope = 0;
+
+  /* Remember the decls in this scope.  */
+  decl = getdecls ();
+  poplevel (0, 0);
+
+  /* Add them to the parent scope.  */
+  while (decl != NULL_TREE)
+    {
+      next = DECL_CHAIN (decl);
+      DECL_CHAIN (decl) = NULL_TREE;
+
+      pushdecl (decl);
+      decl = next;
+    }
+}
+
+
+/* Finish a scope containing a block of statements.  */
+
+tree
+gfc_finish_block (stmtblock_t * stmtblock)
+{
+  tree decl;
+  tree expr;
+  tree block;
+
+  expr = stmtblock->head;
+  if (!expr)
+    expr = build_empty_stmt (input_location);
+
+  stmtblock->head = NULL_TREE;
+
+  if (stmtblock->has_scope)
+    {
+      decl = getdecls ();
+
+      if (decl)
+	{
+	  block = poplevel (1, 0);
+	  expr = build3_v (BIND_EXPR, decl, expr, block);
+	}
+      else
+	poplevel (0, 0);
+    }
+
+  return expr;
+}
+
+
+/* Build an ADDR_EXPR and cast the result to TYPE.  If TYPE is NULL, the
+   natural type is used.  */
+
+tree
+gfc_build_addr_expr (tree type, tree t)
+{
+  tree base_type = TREE_TYPE (t);
+  tree natural_type;
+
+  if (type && POINTER_TYPE_P (type)
+      && TREE_CODE (base_type) == ARRAY_TYPE
+      && TYPE_MAIN_VARIANT (TREE_TYPE (type))
+	 == TYPE_MAIN_VARIANT (TREE_TYPE (base_type)))
+    {
+      tree min_val = size_zero_node;
+      tree type_domain = TYPE_DOMAIN (base_type);
+      if (type_domain && TYPE_MIN_VALUE (type_domain))
+        min_val = TYPE_MIN_VALUE (type_domain);
+      t = fold (build4_loc (input_location, ARRAY_REF, TREE_TYPE (type),
+			    t, min_val, NULL_TREE, NULL_TREE));
+      natural_type = type;
+    }
+  else
+    natural_type = build_pointer_type (base_type);
+
+  if (TREE_CODE (t) == INDIRECT_REF)
+    {
+      if (!type)
+	type = natural_type;
+      t = TREE_OPERAND (t, 0);
+      natural_type = TREE_TYPE (t);
+    }
+  else
+    {
+      tree base = get_base_address (t);
+      if (base && DECL_P (base))
+        TREE_ADDRESSABLE (base) = 1;
+      t = fold_build1_loc (input_location, ADDR_EXPR, natural_type, t);
+    }
+
+  if (type && natural_type != type)
+    t = convert (type, t);
+
+  return t;
+}
+
+
+/* Build an ARRAY_REF with its natural type.  */
+
+tree
+gfc_build_array_ref (tree base, tree offset, tree decl)
+{
+  tree type = TREE_TYPE (base);
+  tree tmp;
+  tree span;
+
+  if (GFC_ARRAY_TYPE_P (type) && GFC_TYPE_ARRAY_RANK (type) == 0)
+    {
+      gcc_assert (GFC_TYPE_ARRAY_CORANK (type) > 0);
+
+      return fold_convert (TYPE_MAIN_VARIANT (type), base);
+    }
+
+  /* Scalar coarray, there is nothing to do.  */
+  if (TREE_CODE (type) != ARRAY_TYPE)
+    {
+      gcc_assert (decl == NULL_TREE);
+      gcc_assert (integer_zerop (offset));
+      return base;
+    }
+
+  type = TREE_TYPE (type);
+
+  if (DECL_P (base))
+    TREE_ADDRESSABLE (base) = 1;
+
+  /* Strip NON_LVALUE_EXPR nodes.  */
+  STRIP_TYPE_NOPS (offset);
+
+  /* If the array reference is to a pointer, whose target contains a
+     subreference, use the span that is stored with the backend decl
+     and reference the element with pointer arithmetic.  */
+  if (decl && (TREE_CODE (decl) == FIELD_DECL
+		 || TREE_CODE (decl) == VAR_DECL
+		 || TREE_CODE (decl) == PARM_DECL)
+	&& ((GFC_DECL_SUBREF_ARRAY_P (decl)
+	      && !integer_zerop (GFC_DECL_SPAN(decl)))
+	   || GFC_DECL_CLASS (decl)))
+    {
+      if (GFC_DECL_CLASS (decl))
+	{
+	  /* Allow for dummy arguments and other good things.  */
+	  if (POINTER_TYPE_P (TREE_TYPE (decl)))
+	    decl = build_fold_indirect_ref_loc (input_location, decl);
+
+	  /* Check if '_data' is an array descriptor. If it is not,
+	     the array must be one of the components of the class object,
+	     so return a normal array reference.  */
+	  if (!GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (gfc_class_data_get (decl))))
+	    return build4_loc (input_location, ARRAY_REF, type, base,
+			       offset, NULL_TREE, NULL_TREE);
+
+	  span = gfc_vtable_size_get (decl);
+	}
+      else if (GFC_DECL_SUBREF_ARRAY_P (decl))
+	span = GFC_DECL_SPAN(decl);
+      else
+	gcc_unreachable ();
+
+      offset = fold_build2_loc (input_location, MULT_EXPR,
+				gfc_array_index_type,
+				offset, span);
+      tmp = gfc_build_addr_expr (pvoid_type_node, base);
+      tmp = fold_build_pointer_plus_loc (input_location, tmp, offset);
+      tmp = fold_convert (build_pointer_type (type), tmp);
+      if (!TYPE_STRING_FLAG (type))
+	tmp = build_fold_indirect_ref_loc (input_location, tmp);
+      return tmp;
+    }
+  else
+    /* Otherwise use a straightforward array reference.  */
+    return build4_loc (input_location, ARRAY_REF, type, base, offset,
+		       NULL_TREE, NULL_TREE);
+}
+
+
+/* Generate a call to print a runtime error possibly including multiple
+   arguments and a locus.  */
+
+static tree
+trans_runtime_error_vararg (bool error, locus* where, const char* msgid,
+			    va_list ap)
+{
+  stmtblock_t block;
+  tree tmp;
+  tree arg, arg2;
+  tree *argarray;
+  tree fntype;
+  char *message;
+  const char *p;
+  int line, nargs, i;
+  location_t loc;
+
+  /* Compute the number of extra arguments from the format string.  */
+  for (p = msgid, nargs = 0; *p; p++)
+    if (*p == '%')
+      {
+	p++;
+	if (*p != '%')
+	  nargs++;
+      }
+
+  /* The code to generate the error.  */
+  gfc_start_block (&block);
+
+  if (where)
+    {
+      line = LOCATION_LINE (where->lb->location);
+      asprintf (&message, "At line %d of file %s",  line,
+		where->lb->file->filename);
+    }
+  else
+    asprintf (&message, "In file '%s', around line %d",
+	      gfc_source_file, LOCATION_LINE (input_location) + 1);
+
+  arg = gfc_build_addr_expr (pchar_type_node,
+			     gfc_build_localized_cstring_const (message));
+  free (message);
+
+  asprintf (&message, "%s", _(msgid));
+  arg2 = gfc_build_addr_expr (pchar_type_node,
+			      gfc_build_localized_cstring_const (message));
+  free (message);
+
+  /* Build the argument array.  */
+  argarray = XALLOCAVEC (tree, nargs + 2);
+  argarray[0] = arg;
+  argarray[1] = arg2;
+  for (i = 0; i < nargs; i++)
+    argarray[2 + i] = va_arg (ap, tree);
+
+  /* Build the function call to runtime_(warning,error)_at; because of the
+     variable number of arguments, we can't use build_call_expr_loc dinput_location,
+     irectly.  */
+  if (error)
+    fntype = TREE_TYPE (gfor_fndecl_runtime_error_at);
+  else
+    fntype = TREE_TYPE (gfor_fndecl_runtime_warning_at);
+
+  loc = where ? where->lb->location : input_location;
+  tmp = fold_builtin_call_array (loc, TREE_TYPE (fntype),
+				 fold_build1_loc (loc, ADDR_EXPR,
+					     build_pointer_type (fntype),
+					     error
+					     ? gfor_fndecl_runtime_error_at
+					     : gfor_fndecl_runtime_warning_at),
+				 nargs + 2, argarray);
+  gfc_add_expr_to_block (&block, tmp);
+
+  return gfc_finish_block (&block);
+}
+
+
+tree
+gfc_trans_runtime_error (bool error, locus* where, const char* msgid, ...)
+{
+  va_list ap;
+  tree result;
+
+  va_start (ap, msgid);
+  result = trans_runtime_error_vararg (error, where, msgid, ap);
+  va_end (ap);
+  return result;
+}
+
+
+/* Generate a runtime error if COND is true.  */
+
+void
+gfc_trans_runtime_check (bool error, bool once, tree cond, stmtblock_t * pblock,
+			 locus * where, const char * msgid, ...)
+{
+  va_list ap;
+  stmtblock_t block;
+  tree body;
+  tree tmp;
+  tree tmpvar = NULL;
+
+  if (integer_zerop (cond))
+    return;
+
+  if (once)
+    {
+       tmpvar = gfc_create_var (boolean_type_node, "print_warning");
+       TREE_STATIC (tmpvar) = 1;
+       DECL_INITIAL (tmpvar) = boolean_true_node;
+       gfc_add_expr_to_block (pblock, tmpvar);
+    }
+
+  gfc_start_block (&block);
+
+  /* For error, runtime_error_at already implies PRED_NORETURN.  */
+  if (!error && once)
+    gfc_add_expr_to_block (&block, build_predict_expr (PRED_FORTRAN_WARN_ONCE,
+						       NOT_TAKEN));
+
+  /* The code to generate the error.  */
+  va_start (ap, msgid);
+  gfc_add_expr_to_block (&block,
+			 trans_runtime_error_vararg (error, where,
+						     msgid, ap));
+  va_end (ap);
+
+  if (once)
+    gfc_add_modify (&block, tmpvar, boolean_false_node);
+
+  body = gfc_finish_block (&block);
+
+  if (integer_onep (cond))
+    {
+      gfc_add_expr_to_block (pblock, body);
+    }
+  else
+    {
+      if (once)
+	cond = fold_build2_loc (where->lb->location, TRUTH_AND_EXPR,
+				long_integer_type_node, tmpvar, cond);
+      else
+	cond = fold_convert (long_integer_type_node, cond);
+
+      tmp = fold_build3_loc (where->lb->location, COND_EXPR, void_type_node,
+			     cond, body,
+			     build_empty_stmt (where->lb->location));
+      gfc_add_expr_to_block (pblock, tmp);
+    }
+}
+
+
+/* Call malloc to allocate size bytes of memory, with special conditions:
+      + if size == 0, return a malloced area of size 1,
+      + if malloc returns NULL, issue a runtime error.  */
+tree
+gfc_call_malloc (stmtblock_t * block, tree type, tree size)
+{
+  tree tmp, msg, malloc_result, null_result, res, malloc_tree;
+  stmtblock_t block2;
+
+  size = gfc_evaluate_now (size, block);
+
+  if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+    size = fold_convert (size_type_node, size);
+
+  /* Create a variable to hold the result.  */
+  res = gfc_create_var (prvoid_type_node, NULL);
+
+  /* Call malloc.  */
+  gfc_start_block (&block2);
+
+  size = fold_build2_loc (input_location, MAX_EXPR, size_type_node, size,
+			  build_int_cst (size_type_node, 1));
+
+  malloc_tree = builtin_decl_explicit (BUILT_IN_MALLOC);
+  gfc_add_modify (&block2, res,
+		  fold_convert (prvoid_type_node,
+				build_call_expr_loc (input_location,
+						     malloc_tree, 1, size)));
+
+  /* Optionally check whether malloc was successful.  */
+  if (gfc_option.rtcheck & GFC_RTCHECK_MEM)
+    {
+      null_result = fold_build2_loc (input_location, EQ_EXPR,
+				     boolean_type_node, res,
+				     build_int_cst (pvoid_type_node, 0));
+      msg = gfc_build_addr_expr (pchar_type_node,
+	      gfc_build_localized_cstring_const ("Memory allocation failed"));
+      tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			     null_result,
+	      build_call_expr_loc (input_location,
+				   gfor_fndecl_os_error, 1, msg),
+				   build_empty_stmt (input_location));
+      gfc_add_expr_to_block (&block2, tmp);
+    }
+
+  malloc_result = gfc_finish_block (&block2);
+
+  gfc_add_expr_to_block (block, malloc_result);
+
+  if (type != NULL)
+    res = fold_convert (type, res);
+  return res;
+}
+
+
+/* Allocate memory, using an optional status argument.
+
+   This function follows the following pseudo-code:
+
+    void *
+    allocate (size_t size, integer_type stat)
+    {
+      void *newmem;
+
+      if (stat requested)
+	stat = 0;
+
+      newmem = malloc (MAX (size, 1));
+      if (newmem == NULL)
+      {
+        if (stat)
+          *stat = LIBERROR_ALLOCATION;
+        else
+	  runtime_error ("Allocation would exceed memory limit");
+      }
+      return newmem;
+    }  */
+void
+gfc_allocate_using_malloc (stmtblock_t * block, tree pointer,
+			   tree size, tree status)
+{
+  tree tmp, error_cond;
+  stmtblock_t on_error;
+  tree status_type = status ? TREE_TYPE (status) : NULL_TREE;
+
+  /* Evaluate size only once, and make sure it has the right type.  */
+  size = gfc_evaluate_now (size, block);
+  if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+    size = fold_convert (size_type_node, size);
+
+  /* If successful and stat= is given, set status to 0.  */
+  if (status != NULL_TREE)
+      gfc_add_expr_to_block (block,
+	     fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+			      status, build_int_cst (status_type, 0)));
+
+  /* The allocation itself.  */
+  gfc_add_modify (block, pointer,
+	  fold_convert (TREE_TYPE (pointer),
+		build_call_expr_loc (input_location,
+			     builtin_decl_explicit (BUILT_IN_MALLOC), 1,
+			     fold_build2_loc (input_location,
+				      MAX_EXPR, size_type_node, size,
+				      build_int_cst (size_type_node, 1)))));
+
+  /* What to do in case of error.  */
+  gfc_start_block (&on_error);
+  if (status != NULL_TREE)
+    {
+      gfc_add_expr_to_block (&on_error,
+			     build_predict_expr (PRED_FORTRAN_FAIL_ALLOC,
+						 NOT_TAKEN));
+      tmp = fold_build2_loc (input_location, MODIFY_EXPR, status_type, status,
+			     build_int_cst (status_type, LIBERROR_ALLOCATION));
+      gfc_add_expr_to_block (&on_error, tmp);
+    }
+  else
+    {
+      /* Here, os_error already implies PRED_NORETURN.  */
+      tmp = build_call_expr_loc (input_location, gfor_fndecl_os_error, 1,
+		    gfc_build_addr_expr (pchar_type_node,
+				 gfc_build_localized_cstring_const
+				    ("Allocation would exceed memory limit")));
+      gfc_add_expr_to_block (&on_error, tmp);
+    }
+
+  error_cond = fold_build2_loc (input_location, EQ_EXPR,
+				boolean_type_node, pointer,
+				build_int_cst (prvoid_type_node, 0));
+  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			 error_cond, gfc_finish_block (&on_error),
+			 build_empty_stmt (input_location));
+
+  gfc_add_expr_to_block (block, tmp);
+}
+
+
+/* Allocate memory, using an optional status argument.
+
+   This function follows the following pseudo-code:
+
+    void *
+    allocate (size_t size, void** token, int *stat, char* errmsg, int errlen)
+    {
+      void *newmem;
+
+      newmem = _caf_register (size, regtype, token, &stat, errmsg, errlen);
+      return newmem;
+    }  */
+static void
+gfc_allocate_using_lib (stmtblock_t * block, tree pointer, tree size,
+			tree token, tree status, tree errmsg, tree errlen)
+{
+  tree tmp, pstat;
+
+  gcc_assert (token != NULL_TREE);
+
+  /* Evaluate size only once, and make sure it has the right type.  */
+  size = gfc_evaluate_now (size, block);
+  if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+    size = fold_convert (size_type_node, size);
+
+  /* The allocation itself.  */
+  if (status == NULL_TREE)
+    pstat  = null_pointer_node;
+  else
+    pstat  = gfc_build_addr_expr (NULL_TREE, status);
+
+  if (errmsg == NULL_TREE)
+    {
+      gcc_assert(errlen == NULL_TREE);
+      errmsg = null_pointer_node;
+      errlen = build_int_cst (integer_type_node, 0);
+    }
+
+  tmp = build_call_expr_loc (input_location,
+	     gfor_fndecl_caf_register, 6,
+	     fold_build2_loc (input_location,
+			      MAX_EXPR, size_type_node, size,
+			      build_int_cst (size_type_node, 1)),
+	     build_int_cst (integer_type_node,
+			    GFC_CAF_COARRAY_ALLOC),
+	     token, pstat, errmsg, errlen);
+
+  tmp = fold_build2_loc (input_location, MODIFY_EXPR,
+			 TREE_TYPE (pointer), pointer,
+			 fold_convert ( TREE_TYPE (pointer), tmp));
+  gfc_add_expr_to_block (block, tmp);
+}
+
+
+/* Generate code for an ALLOCATE statement when the argument is an
+   allocatable variable.  If the variable is currently allocated, it is an
+   error to allocate it again.
+
+   This function follows the following pseudo-code:
+
+    void *
+    allocate_allocatable (void *mem, size_t size, integer_type stat)
+    {
+      if (mem == NULL)
+	return allocate (size, stat);
+      else
+      {
+	if (stat)
+	  stat = LIBERROR_ALLOCATION;
+	else
+	  runtime_error ("Attempting to allocate already allocated variable");
+      }
+    }
+
+    expr must be set to the original expression being allocated for its locus
+    and variable name in case a runtime error has to be printed.  */
+void
+gfc_allocate_allocatable (stmtblock_t * block, tree mem, tree size, tree token,
+			  tree status, tree errmsg, tree errlen, tree label_finish,
+			  gfc_expr* expr)
+{
+  stmtblock_t alloc_block;
+  tree tmp, null_mem, alloc, error;
+  tree type = TREE_TYPE (mem);
+
+  if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+    size = fold_convert (size_type_node, size);
+
+  null_mem = gfc_unlikely (fold_build2_loc (input_location, NE_EXPR,
+					    boolean_type_node, mem,
+					    build_int_cst (type, 0)),
+			   PRED_FORTRAN_FAIL_ALLOC);
+
+  /* If mem is NULL, we call gfc_allocate_using_malloc or
+     gfc_allocate_using_lib.  */
+  gfc_start_block (&alloc_block);
+
+  if (gfc_option.coarray == GFC_FCOARRAY_LIB
+      && gfc_expr_attr (expr).codimension)
+    {
+      tree cond;
+
+      gfc_allocate_using_lib (&alloc_block, mem, size, token, status,
+			      errmsg, errlen);
+      if (status != NULL_TREE)
+	{
+	  TREE_USED (label_finish) = 1;
+	  tmp = build1_v (GOTO_EXPR, label_finish);
+	  cond = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+				  status, build_zero_cst (TREE_TYPE (status)));
+	  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+				 gfc_unlikely (cond, PRED_FORTRAN_FAIL_ALLOC),
+				 tmp, build_empty_stmt (input_location));
+	  gfc_add_expr_to_block (&alloc_block, tmp);
+	}
+    }
+  else
+    gfc_allocate_using_malloc (&alloc_block, mem, size, status);
+
+  alloc = gfc_finish_block (&alloc_block);
+
+  /* If mem is not NULL, we issue a runtime error or set the
+     status variable.  */
+  if (expr)
+    {
+      tree varname;
+
+      gcc_assert (expr->expr_type == EXPR_VARIABLE && expr->symtree);
+      varname = gfc_build_cstring_const (expr->symtree->name);
+      varname = gfc_build_addr_expr (pchar_type_node, varname);
+
+      error = gfc_trans_runtime_error (true, &expr->where,
+				       "Attempting to allocate already"
+				       " allocated variable '%s'",
+				       varname);
+    }
+  else
+    error = gfc_trans_runtime_error (true, NULL,
+				     "Attempting to allocate already allocated"
+				     " variable");
+
+  if (status != NULL_TREE)
+    {
+      tree status_type = TREE_TYPE (status);
+
+      error = fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+	      status, build_int_cst (status_type, LIBERROR_ALLOCATION));
+    }
+
+  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node, null_mem,
+			 error, alloc);
+  gfc_add_expr_to_block (block, tmp);
+}
+
+
+/* Free a given variable, if it's not NULL.  */
+tree
+gfc_call_free (tree var)
+{
+  stmtblock_t block;
+  tree tmp, cond, call;
+
+  if (TREE_TYPE (var) != TREE_TYPE (pvoid_type_node))
+    var = fold_convert (pvoid_type_node, var);
+
+  gfc_start_block (&block);
+  var = gfc_evaluate_now (var, &block);
+  cond = fold_build2_loc (input_location, NE_EXPR, boolean_type_node, var,
+			  build_int_cst (pvoid_type_node, 0));
+  call = build_call_expr_loc (input_location,
+			      builtin_decl_explicit (BUILT_IN_FREE),
+			      1, var);
+  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node, cond, call,
+			 build_empty_stmt (input_location));
+  gfc_add_expr_to_block (&block, tmp);
+
+  return gfc_finish_block (&block);
+}
+
+
+/* Build a call to a FINAL procedure, which finalizes "var".  */
+
+static tree
+gfc_build_final_call (gfc_typespec ts, gfc_expr *final_wrapper, gfc_expr *var,
+		      bool fini_coarray, gfc_expr *class_size)
+{
+  stmtblock_t block;
+  gfc_se se;
+  tree final_fndecl, array, size, tmp;
+  symbol_attribute attr;
+
+  gcc_assert (final_wrapper->expr_type == EXPR_VARIABLE);
+  gcc_assert (var);
+
+  gfc_start_block (&block);
+  gfc_init_se (&se, NULL);
+  gfc_conv_expr (&se, final_wrapper);
+  final_fndecl = se.expr;
+  if (POINTER_TYPE_P (TREE_TYPE (final_fndecl)))
+    final_fndecl = build_fold_indirect_ref_loc (input_location, final_fndecl);
+
+  if (ts.type == BT_DERIVED)
+    {
+      tree elem_size;
+
+      gcc_assert (!class_size);
+      elem_size = gfc_typenode_for_spec (&ts);
+      elem_size = TYPE_SIZE_UNIT (elem_size);
+      size = fold_convert (gfc_array_index_type, elem_size);
+
+      gfc_init_se (&se, NULL);
+      se.want_pointer = 1;
+      if (var->rank)
+	{
+	  se.descriptor_only = 1;
+	  gfc_conv_expr_descriptor (&se, var);
+	  array = se.expr;
+	}
+      else
+	{
+	  gfc_conv_expr (&se, var);
+	  gcc_assert (se.pre.head == NULL_TREE && se.post.head == NULL_TREE);
+	  array = se.expr;
+
+	  /* No copy back needed, hence set attr's allocatable/pointer
+	     to zero.  */
+	  gfc_clear_attr (&attr);
+	  gfc_init_se (&se, NULL);
+	  array = gfc_conv_scalar_to_descriptor (&se, array, attr);
+	  gcc_assert (se.post.head == NULL_TREE);
+	}
+    }
+  else
+    {
+      gfc_expr *array_expr;
+      gcc_assert (class_size);
+      gfc_init_se (&se, NULL);
+      gfc_conv_expr (&se, class_size);
+      gfc_add_block_to_block (&block, &se.pre);
+      gcc_assert (se.post.head == NULL_TREE);
+      size = se.expr;
+
+      array_expr = gfc_copy_expr (var);
+      gfc_init_se (&se, NULL);
+      se.want_pointer = 1;
+      if (array_expr->rank)
+	{
+	  gfc_add_class_array_ref (array_expr);
+	  se.descriptor_only = 1;
+	  gfc_conv_expr_descriptor (&se, array_expr);
+	  array = se.expr;
+	}
+      else
+	{
+	  gfc_add_data_component (array_expr);
+	  gfc_conv_expr (&se, array_expr);
+	  gfc_add_block_to_block (&block, &se.pre);
+	  gcc_assert (se.post.head == NULL_TREE);
+	  array = se.expr;
+	  if (TREE_CODE (array) == ADDR_EXPR
+	      && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (array, 0))))
+	    tmp = TREE_OPERAND (array, 0);
+
+	  if (!gfc_is_coarray (array_expr))
+	    {
+	      /* No copy back needed, hence set attr's allocatable/pointer
+		 to zero.  */
+	      gfc_clear_attr (&attr);
+	      gfc_init_se (&se, NULL);
+	      array = gfc_conv_scalar_to_descriptor (&se, array, attr);
+	    }
+	  gcc_assert (se.post.head == NULL_TREE);
+	}
+      gfc_free_expr (array_expr);
+    }
+
+  if (!POINTER_TYPE_P (TREE_TYPE (array)))
+    array = gfc_build_addr_expr (NULL, array);
+
+  gfc_add_block_to_block (&block, &se.pre);
+  tmp = build_call_expr_loc (input_location,
+			     final_fndecl, 3, array,
+			     size, fini_coarray ? boolean_true_node
+						: boolean_false_node);
+  gfc_add_block_to_block (&block, &se.post);
+  gfc_add_expr_to_block (&block, tmp);
+  return gfc_finish_block (&block);
+}
+
+
+bool
+gfc_add_comp_finalizer_call (stmtblock_t *block, tree decl, gfc_component *comp,
+			     bool fini_coarray)
+{
+  gfc_se se;
+  stmtblock_t block2;
+  tree final_fndecl, size, array, tmp, cond;
+  symbol_attribute attr;
+  gfc_expr *final_expr = NULL;
+
+  if (comp->ts.type != BT_DERIVED && comp->ts.type != BT_CLASS)
+    return false;
+
+  gfc_init_block (&block2);
+
+  if (comp->ts.type == BT_DERIVED)
+    {
+      if (comp->attr.pointer)
+	return false;
+
+      gfc_is_finalizable (comp->ts.u.derived, &final_expr);
+      if (!final_expr)
+        return false;
+
+      gfc_init_se (&se, NULL);
+      gfc_conv_expr (&se, final_expr);
+      final_fndecl = se.expr;
+      size = gfc_typenode_for_spec (&comp->ts);
+      size = TYPE_SIZE_UNIT (size);
+      size = fold_convert (gfc_array_index_type, size);
+
+      array = decl;
+    }
+  else /* comp->ts.type == BT_CLASS.  */
+    {
+      if (CLASS_DATA (comp)->attr.class_pointer)
+	return false;
+
+      gfc_is_finalizable (CLASS_DATA (comp)->ts.u.derived, &final_expr);
+      final_fndecl = gfc_vtable_final_get (decl);
+      size = gfc_vtable_size_get (decl);
+      array = gfc_class_data_get (decl);
+    }
+
+  if (comp->attr.allocatable
+      || (comp->ts.type == BT_CLASS && CLASS_DATA (comp)->attr.allocatable))
+    {
+      tmp = GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (array))
+	    ?  gfc_conv_descriptor_data_get (array) : array;
+      cond = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			    tmp, fold_convert (TREE_TYPE (tmp),
+						 null_pointer_node));
+    }
+  else
+    cond = boolean_true_node;
+
+  if (!GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (array)))
+    {
+      gfc_clear_attr (&attr);
+      gfc_init_se (&se, NULL);
+      array = gfc_conv_scalar_to_descriptor (&se, array, attr);
+      gfc_add_block_to_block (&block2, &se.pre);
+      gcc_assert (se.post.head == NULL_TREE);
+    }
+
+  if (!POINTER_TYPE_P (TREE_TYPE (array)))
+    array = gfc_build_addr_expr (NULL, array);
+
+  if (!final_expr)
+    {
+      tmp = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			     final_fndecl,
+			     fold_convert (TREE_TYPE (final_fndecl),
+					   null_pointer_node));
+      cond = fold_build2_loc (input_location, TRUTH_ANDIF_EXPR,
+			      boolean_type_node, cond, tmp);
+    }
+
+  if (POINTER_TYPE_P (TREE_TYPE (final_fndecl)))
+    final_fndecl = build_fold_indirect_ref_loc (input_location, final_fndecl);
+
+  tmp = build_call_expr_loc (input_location,
+			     final_fndecl, 3, array,
+			     size, fini_coarray ? boolean_true_node
+						: boolean_false_node);
+  gfc_add_expr_to_block (&block2, tmp);
+  tmp = gfc_finish_block (&block2);
+
+  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node, cond, tmp,
+			 build_empty_stmt (input_location));
+  gfc_add_expr_to_block (block, tmp);
+
+  return true;
+}
+
+
+/* Add a call to the finalizer, using the passed *expr. Returns
+   true when a finalizer call has been inserted.  */
+
+bool
+gfc_add_finalizer_call (stmtblock_t *block, gfc_expr *expr2)
+{
+  tree tmp;
+  gfc_ref *ref;
+  gfc_expr *expr;
+  gfc_expr *final_expr = NULL;
+  gfc_expr *elem_size = NULL;
+  bool has_finalizer = false;
+
+  if (!expr2 || (expr2->ts.type != BT_DERIVED && expr2->ts.type != BT_CLASS))
+    return false;
+
+  if (expr2->ts.type == BT_DERIVED)
+    {
+      gfc_is_finalizable (expr2->ts.u.derived, &final_expr);
+      if (!final_expr)
+        return false;
+    }
+
+  /* If we have a class array, we need go back to the class
+     container. */
+  expr = gfc_copy_expr (expr2);
+
+  if (expr->ref && expr->ref->next && !expr->ref->next->next
+      && expr->ref->next->type == REF_ARRAY
+      && expr->ref->type == REF_COMPONENT
+      && strcmp (expr->ref->u.c.component->name, "_data") == 0)
+    {
+      gfc_free_ref_list (expr->ref);
+      expr->ref = NULL;
+    }
+  else
+    for (ref = expr->ref; ref; ref = ref->next)
+      if (ref->next && ref->next->next && !ref->next->next->next
+         && ref->next->next->type == REF_ARRAY
+         && ref->next->type == REF_COMPONENT
+         && strcmp (ref->next->u.c.component->name, "_data") == 0)
+       {
+         gfc_free_ref_list (ref->next);
+         ref->next = NULL;
+       }
+
+  if (expr->ts.type == BT_CLASS)
+    {
+      has_finalizer = gfc_is_finalizable (expr->ts.u.derived, NULL);
+
+      if (!expr2->rank && !expr2->ref && CLASS_DATA (expr2->symtree->n.sym)->as)
+	expr->rank = CLASS_DATA (expr2->symtree->n.sym)->as->rank;
+
+      final_expr = gfc_copy_expr (expr);
+      gfc_add_vptr_component (final_expr);
+      gfc_add_component_ref (final_expr, "_final");
+
+      elem_size = gfc_copy_expr (expr);
+      gfc_add_vptr_component (elem_size);
+      gfc_add_component_ref (elem_size, "_size");
+    }
+
+  gcc_assert (final_expr->expr_type == EXPR_VARIABLE);
+
+  tmp = gfc_build_final_call (expr->ts, final_expr, expr,
+			      false, elem_size);
+
+  if (expr->ts.type == BT_CLASS && !has_finalizer)
+    {
+      tree cond;
+      gfc_se se;
+
+      gfc_init_se (&se, NULL);
+      se.want_pointer = 1;
+      gfc_conv_expr (&se, final_expr);
+      cond = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			      se.expr, build_int_cst (TREE_TYPE (se.expr), 0));
+
+      /* For CLASS(*) not only sym->_vtab->_final can be NULL
+	 but already sym->_vtab itself.  */
+      if (UNLIMITED_POLY (expr))
+	{
+	  tree cond2;
+	  gfc_expr *vptr_expr;
+
+	  vptr_expr = gfc_copy_expr (expr);
+	  gfc_add_vptr_component (vptr_expr);
+
+	  gfc_init_se (&se, NULL);
+	  se.want_pointer = 1;
+	  gfc_conv_expr (&se, vptr_expr);
+	  gfc_free_expr (vptr_expr);
+
+	  cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+				   se.expr,
+				   build_int_cst (TREE_TYPE (se.expr), 0));
+	  cond = fold_build2_loc (input_location, TRUTH_ANDIF_EXPR,
+				  boolean_type_node, cond2, cond);
+	}
+
+      tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			     cond, tmp, build_empty_stmt (input_location));
+    }
+
+  gfc_add_expr_to_block (block, tmp);
+
+  return true;
+}
+
+
+/* User-deallocate; we emit the code directly from the front-end, and the
+   logic is the same as the previous library function:
+
+    void
+    deallocate (void *pointer, GFC_INTEGER_4 * stat)
+    {
+      if (!pointer)
+	{
+	  if (stat)
+	    *stat = 1;
+	  else
+	    runtime_error ("Attempt to DEALLOCATE unallocated memory.");
+	}
+      else
+	{
+	  free (pointer);
+	  if (stat)
+	    *stat = 0;
+	}
+    }
+
+   In this front-end version, status doesn't have to be GFC_INTEGER_4.
+   Moreover, if CAN_FAIL is true, then we will not emit a runtime error,
+   even when no status variable is passed to us (this is used for
+   unconditional deallocation generated by the front-end at end of
+   each procedure).
+
+   If a runtime-message is possible, `expr' must point to the original
+   expression being deallocated for its locus and variable name.
+
+   For coarrays, "pointer" must be the array descriptor and not its
+   "data" component.  */
+tree
+gfc_deallocate_with_status (tree pointer, tree status, tree errmsg,
+			    tree errlen, tree label_finish,
+			    bool can_fail, gfc_expr* expr, bool coarray)
+{
+  stmtblock_t null, non_null;
+  tree cond, tmp, error;
+  tree status_type = NULL_TREE;
+  tree caf_decl = NULL_TREE;
+
+  if (coarray)
+    {
+      gcc_assert (GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (pointer)));
+      caf_decl = pointer;
+      pointer = gfc_conv_descriptor_data_get (caf_decl);
+      STRIP_NOPS (pointer);
+    }
+
+  cond = fold_build2_loc (input_location, EQ_EXPR, boolean_type_node, pointer,
+			  build_int_cst (TREE_TYPE (pointer), 0));
+
+  /* When POINTER is NULL, we set STATUS to 1 if it's present, otherwise
+     we emit a runtime error.  */
+  gfc_start_block (&null);
+  if (!can_fail)
+    {
+      tree varname;
+
+      gcc_assert (expr && expr->expr_type == EXPR_VARIABLE && expr->symtree);
+
+      varname = gfc_build_cstring_const (expr->symtree->name);
+      varname = gfc_build_addr_expr (pchar_type_node, varname);
+
+      error = gfc_trans_runtime_error (true, &expr->where,
+				       "Attempt to DEALLOCATE unallocated '%s'",
+				       varname);
+    }
+  else
+    error = build_empty_stmt (input_location);
+
+  if (status != NULL_TREE && !integer_zerop (status))
+    {
+      tree cond2;
+
+      status_type = TREE_TYPE (TREE_TYPE (status));
+      cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			       status, build_int_cst (TREE_TYPE (status), 0));
+      tmp = fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+			     fold_build1_loc (input_location, INDIRECT_REF,
+					      status_type, status),
+			     build_int_cst (status_type, 1));
+      error = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			       cond2, tmp, error);
+    }
+
+  gfc_add_expr_to_block (&null, error);
+
+  /* When POINTER is not NULL, we free it.  */
+  gfc_start_block (&non_null);
+  gfc_add_finalizer_call (&non_null, expr);
+  if (!coarray || gfc_option.coarray != GFC_FCOARRAY_LIB)
+    {
+      tmp = build_call_expr_loc (input_location,
+				 builtin_decl_explicit (BUILT_IN_FREE), 1,
+				 fold_convert (pvoid_type_node, pointer));
+      gfc_add_expr_to_block (&non_null, tmp);
+
+      if (status != NULL_TREE && !integer_zerop (status))
+	{
+	  /* We set STATUS to zero if it is present.  */
+	  tree status_type = TREE_TYPE (TREE_TYPE (status));
+	  tree cond2;
+
+	  cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+				   status,
+				   build_int_cst (TREE_TYPE (status), 0));
+	  tmp = fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+				 fold_build1_loc (input_location, INDIRECT_REF,
+						  status_type, status),
+				 build_int_cst (status_type, 0));
+	  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+				 gfc_unlikely (cond2, PRED_FORTRAN_FAIL_ALLOC),
+				 tmp, build_empty_stmt (input_location));
+	  gfc_add_expr_to_block (&non_null, tmp);
+	}
+    }
+  else
+    {
+      tree caf_type, token, cond2;
+      tree pstat = null_pointer_node;
+
+      if (errmsg == NULL_TREE)
+	{
+	  gcc_assert (errlen == NULL_TREE);
+	  errmsg = null_pointer_node;
+	  errlen = build_zero_cst (integer_type_node);
+	}
+      else
+	{
+	  gcc_assert (errlen != NULL_TREE);
+	  if (!POINTER_TYPE_P (TREE_TYPE (errmsg)))
+	    errmsg = gfc_build_addr_expr (NULL_TREE, errmsg);
+	}
+
+      caf_type = TREE_TYPE (caf_decl);
+
+      if (status != NULL_TREE && !integer_zerop (status))
+	{
+	  gcc_assert (status_type == integer_type_node);
+	  pstat = status;
+	}
+
+      if (GFC_DESCRIPTOR_TYPE_P (caf_type)
+	  && GFC_TYPE_ARRAY_AKIND (caf_type) == GFC_ARRAY_ALLOCATABLE)
+	token = gfc_conv_descriptor_token (caf_decl);
+      else if (DECL_LANG_SPECIFIC (caf_decl)
+	       && GFC_DECL_TOKEN (caf_decl) != NULL_TREE)
+	token = GFC_DECL_TOKEN (caf_decl);
+      else
+	{
+	  gcc_assert (GFC_ARRAY_TYPE_P (caf_type)
+		      && GFC_TYPE_ARRAY_CAF_TOKEN (caf_type) != NULL_TREE);
+	  token = GFC_TYPE_ARRAY_CAF_TOKEN (caf_type);
+	}
+
+      token = gfc_build_addr_expr  (NULL_TREE, token);
+      tmp = build_call_expr_loc (input_location,
+	     gfor_fndecl_caf_deregister, 4,
+	     token, pstat, errmsg, errlen);
+      gfc_add_expr_to_block (&non_null, tmp);
+
+      if (status != NULL_TREE)
+	{
+	  tree stat = build_fold_indirect_ref_loc (input_location, status);
+
+	  TREE_USED (label_finish) = 1;
+	  tmp = build1_v (GOTO_EXPR, label_finish);
+	  cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+				   stat, build_zero_cst (TREE_TYPE (stat)));
+	  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+				 gfc_unlikely (cond2, PRED_FORTRAN_FAIL_ALLOC),
+				 tmp, build_empty_stmt (input_location));
+	  gfc_add_expr_to_block (&non_null, tmp);
+	}
+    }
+
+  return fold_build3_loc (input_location, COND_EXPR, void_type_node, cond,
+			  gfc_finish_block (&null),
+			  gfc_finish_block (&non_null));
+}
+
+
+/* Generate code for deallocation of allocatable scalars (variables or
+   components). Before the object itself is freed, any allocatable
+   subcomponents are being deallocated.  */
+
+tree
+gfc_deallocate_scalar_with_status (tree pointer, tree status, bool can_fail,
+				   gfc_expr* expr, gfc_typespec ts)
+{
+  stmtblock_t null, non_null;
+  tree cond, tmp, error;
+  bool finalizable;
+
+  cond = fold_build2_loc (input_location, EQ_EXPR, boolean_type_node, pointer,
+			  build_int_cst (TREE_TYPE (pointer), 0));
+
+  /* When POINTER is NULL, we set STATUS to 1 if it's present, otherwise
+     we emit a runtime error.  */
+  gfc_start_block (&null);
+  if (!can_fail)
+    {
+      tree varname;
+
+      gcc_assert (expr && expr->expr_type == EXPR_VARIABLE && expr->symtree);
+
+      varname = gfc_build_cstring_const (expr->symtree->name);
+      varname = gfc_build_addr_expr (pchar_type_node, varname);
+
+      error = gfc_trans_runtime_error (true, &expr->where,
+				       "Attempt to DEALLOCATE unallocated '%s'",
+				       varname);
+    }
+  else
+    error = build_empty_stmt (input_location);
+
+  if (status != NULL_TREE && !integer_zerop (status))
+    {
+      tree status_type = TREE_TYPE (TREE_TYPE (status));
+      tree cond2;
+
+      cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			       status, build_int_cst (TREE_TYPE (status), 0));
+      tmp = fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+			     fold_build1_loc (input_location, INDIRECT_REF,
+					      status_type, status),
+			     build_int_cst (status_type, 1));
+      error = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			       cond2, tmp, error);
+    }
+
+  gfc_add_expr_to_block (&null, error);
+
+  /* When POINTER is not NULL, we free it.  */
+  gfc_start_block (&non_null);
+
+  /* Free allocatable components.  */
+  finalizable = gfc_add_finalizer_call (&non_null, expr);
+  if (!finalizable && ts.type == BT_DERIVED && ts.u.derived->attr.alloc_comp)
+    {
+      tmp = build_fold_indirect_ref_loc (input_location, pointer);
+      tmp = gfc_deallocate_alloc_comp (ts.u.derived, tmp, 0);
+      gfc_add_expr_to_block (&non_null, tmp);
+    }
+
+  tmp = build_call_expr_loc (input_location,
+			     builtin_decl_explicit (BUILT_IN_FREE), 1,
+			     fold_convert (pvoid_type_node, pointer));
+  gfc_add_expr_to_block (&non_null, tmp);
+
+  if (status != NULL_TREE && !integer_zerop (status))
+    {
+      /* We set STATUS to zero if it is present.  */
+      tree status_type = TREE_TYPE (TREE_TYPE (status));
+      tree cond2;
+
+      cond2 = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+			       status, build_int_cst (TREE_TYPE (status), 0));
+      tmp = fold_build2_loc (input_location, MODIFY_EXPR, status_type,
+			     fold_build1_loc (input_location, INDIRECT_REF,
+					      status_type, status),
+			     build_int_cst (status_type, 0));
+      tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node, cond2,
+			     tmp, build_empty_stmt (input_location));
+      gfc_add_expr_to_block (&non_null, tmp);
+    }
+
+  return fold_build3_loc (input_location, COND_EXPR, void_type_node, cond,
+			  gfc_finish_block (&null),
+			  gfc_finish_block (&non_null));
+}
+
+
+/* Reallocate MEM so it has SIZE bytes of data.  This behaves like the
+   following pseudo-code:
+
+void *
+internal_realloc (void *mem, size_t size)
+{
+  res = realloc (mem, size);
+  if (!res && size != 0)
+    _gfortran_os_error ("Allocation would exceed memory limit");
+
+  return res;
+}  */
+tree
+gfc_call_realloc (stmtblock_t * block, tree mem, tree size)
+{
+  tree msg, res, nonzero, null_result, tmp;
+  tree type = TREE_TYPE (mem);
+
+  size = gfc_evaluate_now (size, block);
+
+  if (TREE_TYPE (size) != TREE_TYPE (size_type_node))
+    size = fold_convert (size_type_node, size);
+
+  /* Create a variable to hold the result.  */
+  res = gfc_create_var (type, NULL);
+
+  /* Call realloc and check the result.  */
+  tmp = build_call_expr_loc (input_location,
+			 builtin_decl_explicit (BUILT_IN_REALLOC), 2,
+			 fold_convert (pvoid_type_node, mem), size);
+  gfc_add_modify (block, res, fold_convert (type, tmp));
+  null_result = fold_build2_loc (input_location, EQ_EXPR, boolean_type_node,
+				 res, build_int_cst (pvoid_type_node, 0));
+  nonzero = fold_build2_loc (input_location, NE_EXPR, boolean_type_node, size,
+			     build_int_cst (size_type_node, 0));
+  null_result = fold_build2_loc (input_location, TRUTH_AND_EXPR, boolean_type_node,
+				 null_result, nonzero);
+  msg = gfc_build_addr_expr (pchar_type_node, gfc_build_localized_cstring_const
+			     ("Allocation would exceed memory limit"));
+  tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+			 null_result,
+			 build_call_expr_loc (input_location,
+					      gfor_fndecl_os_error, 1, msg),
+			 build_empty_stmt (input_location));
+  gfc_add_expr_to_block (block, tmp);
+
+  return res;
+}
+
+
+/* Add an expression to another one, either at the front or the back.  */
+
+static void
+add_expr_to_chain (tree* chain, tree expr, bool front)
+{
+  if (expr == NULL_TREE || IS_EMPTY_STMT (expr))
+    return;
+
+  if (*chain)
+    {
+      if (TREE_CODE (*chain) != STATEMENT_LIST)
+	{
+	  tree tmp;
+
+	  tmp = *chain;
+	  *chain = NULL_TREE;
+	  append_to_statement_list (tmp, chain);
+	}
+
+      if (front)
+	{
+	  tree_stmt_iterator i;
+
+	  i = tsi_start (*chain);
+	  tsi_link_before (&i, expr, TSI_CONTINUE_LINKING);
+	}
+      else
+	append_to_statement_list (expr, chain);
+    }
+  else
+    *chain = expr;
+}
+
+
+/* Add a statement at the end of a block.  */
+
+void
+gfc_add_expr_to_block (stmtblock_t * block, tree expr)
+{
+  gcc_assert (block);
+  add_expr_to_chain (&block->head, expr, false);
+}
+
+
+/* Add a statement at the beginning of a block.  */
+
+void
+gfc_prepend_expr_to_block (stmtblock_t * block, tree expr)
+{
+  gcc_assert (block);
+  add_expr_to_chain (&block->head, expr, true);
+}
+
+
+/* Add a block the end of a block.  */
+
+void
+gfc_add_block_to_block (stmtblock_t * block, stmtblock_t * append)
+{
+  gcc_assert (append);
+  gcc_assert (!append->has_scope);
+
+  gfc_add_expr_to_block (block, append->head);
+  append->head = NULL_TREE;
+}
+
+
+/* Save the current locus.  The structure may not be complete, and should
+   only be used with gfc_restore_backend_locus.  */
+
+void
+gfc_save_backend_locus (locus * loc)
+{
+  loc->lb = XCNEW (gfc_linebuf);
+  loc->lb->location = input_location;
+  loc->lb->file = gfc_current_backend_file;
+}
+
+
+/* Set the current locus.  */
+
+void
+gfc_set_backend_locus (locus * loc)
+{
+  gfc_current_backend_file = loc->lb->file;
+  input_location = loc->lb->location;
+}
+
+
+/* Restore the saved locus. Only used in conjunction with
+   gfc_save_backend_locus, to free the memory when we are done.  */
+
+void
+gfc_restore_backend_locus (locus * loc)
+{
+  gfc_set_backend_locus (loc);
+  free (loc->lb);
+}
+
+
+/* Translate an executable statement. The tree cond is used by gfc_trans_do.
+   This static function is wrapped by gfc_trans_code_cond and
+   gfc_trans_code.  */
+
+static tree
+trans_code (gfc_code * code, tree cond)
+{
+  stmtblock_t block;
+  tree res;
+
+  if (!code)
+    return build_empty_stmt (input_location);
+
+  gfc_start_block (&block);
+
+  /* Translate statements one by one into GENERIC trees until we reach
+     the end of this gfc_code branch.  */
+  for (; code; code = code->next)
+    {
+      if (code->here != 0)
+	{
+	  res = gfc_trans_label_here (code);
+	  gfc_add_expr_to_block (&block, res);
+	}
+
+      gfc_set_backend_locus (&code->loc);
+
+      switch (code->op)
+	{
+	case EXEC_NOP:
+	case EXEC_END_BLOCK:
+	case EXEC_END_NESTED_BLOCK:
+	case EXEC_END_PROCEDURE:
+	  res = NULL_TREE;
+	  break;
+
+	case EXEC_ASSIGN:
+	  if (code->expr1->ts.type == BT_CLASS)
+	    res = gfc_trans_class_assign (code->expr1, code->expr2, code->op);
+	  else
+	    res = gfc_trans_assign (code);
+	  break;
+
+        case EXEC_LABEL_ASSIGN:
+          res = gfc_trans_label_assign (code);
+          break;
+
+	case EXEC_POINTER_ASSIGN:
+	  if (code->expr1->ts.type == BT_CLASS)
+	    res = gfc_trans_class_assign (code->expr1, code->expr2, code->op);
+	  else if (UNLIMITED_POLY (code->expr2)
+		   && code->expr1->ts.type == BT_DERIVED
+		   && (code->expr1->ts.u.derived->attr.sequence
+		       || code->expr1->ts.u.derived->attr.is_bind_c))
+	    /* F2003: C717  */
+	    res = gfc_trans_class_assign (code->expr1, code->expr2, code->op);
+	  else
+	    res = gfc_trans_pointer_assign (code);
+	  break;
+
+	case EXEC_INIT_ASSIGN:
+	  if (code->expr1->ts.type == BT_CLASS)
+	    res = gfc_trans_class_init_assign (code);
+	  else
+	    res = gfc_trans_init_assign (code);
+	  break;
+
+	case EXEC_CONTINUE:
+	  res = NULL_TREE;
+	  break;
+
+	case EXEC_CRITICAL:
+	  res = gfc_trans_critical (code);
+	  break;
+
+	case EXEC_CYCLE:
+	  res = gfc_trans_cycle (code);
+	  break;
+
+	case EXEC_EXIT:
+	  res = gfc_trans_exit (code);
+	  break;
+
+	case EXEC_GOTO:
+	  res = gfc_trans_goto (code);
+	  break;
+
+	case EXEC_ENTRY:
+	  res = gfc_trans_entry (code);
+	  break;
+
+	case EXEC_PAUSE:
+	  res = gfc_trans_pause (code);
+	  break;
+
+	case EXEC_STOP:
+	case EXEC_ERROR_STOP:
+	  res = gfc_trans_stop (code, code->op == EXEC_ERROR_STOP);
+	  break;
+
+	case EXEC_CALL:
+	  /* For MVBITS we've got the special exception that we need a
+	     dependency check, too.  */
+	  {
+	    bool is_mvbits = false;
+
+	    if (code->resolved_isym)
+	      {
+		res = gfc_conv_intrinsic_subroutine (code);
+		if (res != NULL_TREE)
+		  break;
+	      }
+
+	    if (code->resolved_isym
+		&& code->resolved_isym->id == GFC_ISYM_MVBITS)
+	      is_mvbits = true;
+
+	    res = gfc_trans_call (code, is_mvbits, NULL_TREE,
+				  NULL_TREE, false);
+	  }
+	  break;
+
+	case EXEC_CALL_PPC:
+	  res = gfc_trans_call (code, false, NULL_TREE,
+				NULL_TREE, false);
+	  break;
+
+	case EXEC_ASSIGN_CALL:
+	  res = gfc_trans_call (code, true, NULL_TREE,
+				NULL_TREE, false);
+	  break;
+
+	case EXEC_RETURN:
+	  res = gfc_trans_return (code);
+	  break;
+
+	case EXEC_IF:
+	  res = gfc_trans_if (code);
+	  break;
+
+	case EXEC_ARITHMETIC_IF:
+	  res = gfc_trans_arithmetic_if (code);
+	  break;
+
+	case EXEC_BLOCK:
+	  res = gfc_trans_block_construct (code);
+	  break;
+
+	case EXEC_DO:
+	  res = gfc_trans_do (code, cond);
+	  break;
+
+	case EXEC_DO_CONCURRENT:
+	  res = gfc_trans_do_concurrent (code);
+	  break;
+
+	case EXEC_DO_WHILE:
+	  res = gfc_trans_do_while (code);
+	  break;
+
+	case EXEC_SELECT:
+	  res = gfc_trans_select (code);
+	  break;
+
+	case EXEC_SELECT_TYPE:
+	  /* Do nothing. SELECT TYPE statements should be transformed into
+	  an ordinary SELECT CASE at resolution stage.
+	  TODO: Add an error message here once this is done.  */
+	  res = NULL_TREE;
+	  break;
+
+	case EXEC_FLUSH:
+	  res = gfc_trans_flush (code);
+	  break;
+
+	case EXEC_SYNC_ALL:
+	case EXEC_SYNC_IMAGES:
+	case EXEC_SYNC_MEMORY:
+	  res = gfc_trans_sync (code, code->op);
+	  break;
+
+	case EXEC_LOCK:
+	case EXEC_UNLOCK:
+	  res = gfc_trans_lock_unlock (code, code->op);
+	  break;
+
+	case EXEC_FORALL:
+	  res = gfc_trans_forall (code);
+	  break;
+
+	case EXEC_WHERE:
+	  res = gfc_trans_where (code);
+	  break;
+
+	case EXEC_ALLOCATE:
+	  res = gfc_trans_allocate (code);
+	  break;
+
+	case EXEC_DEALLOCATE:
+	  res = gfc_trans_deallocate (code);
+	  break;
+
+	case EXEC_OPEN:
+	  res = gfc_trans_open (code);
+	  break;
+
+	case EXEC_CLOSE:
+	  res = gfc_trans_close (code);
+	  break;
+
+	case EXEC_READ:
+	  res = gfc_trans_read (code);
+	  break;
+
+	case EXEC_WRITE:
+	  res = gfc_trans_write (code);
+	  break;
+
+	case EXEC_IOLENGTH:
+	  res = gfc_trans_iolength (code);
+	  break;
+
+	case EXEC_BACKSPACE:
+	  res = gfc_trans_backspace (code);
+	  break;
+
+	case EXEC_ENDFILE:
+	  res = gfc_trans_endfile (code);
+	  break;
+
+	case EXEC_INQUIRE:
+	  res = gfc_trans_inquire (code);
+	  break;
+
+	case EXEC_WAIT:
+	  res = gfc_trans_wait (code);
+	  break;
+
+	case EXEC_REWIND:
+	  res = gfc_trans_rewind (code);
+	  break;
+
+	case EXEC_TRANSFER:
+	  res = gfc_trans_transfer (code);
+	  break;
+
+	case EXEC_DT_END:
+	  res = gfc_trans_dt_end (code);
+	  break;
+
+	case EXEC_OMP_ATOMIC:
+	case EXEC_OMP_BARRIER:
+	case EXEC_OMP_CRITICAL:
+	case EXEC_OMP_DO:
+	case EXEC_OMP_FLUSH:
+	case EXEC_OMP_MASTER:
+	case EXEC_OMP_ORDERED:
+	case EXEC_OMP_PARALLEL:
+	case EXEC_OMP_PARALLEL_DO:
+	case EXEC_OMP_PARALLEL_SECTIONS:
+	case EXEC_OMP_PARALLEL_WORKSHARE:
+	case EXEC_OMP_SECTIONS:
+	case EXEC_OMP_SINGLE:
+	case EXEC_OMP_TASK:
+	case EXEC_OMP_TASKWAIT:
+	case EXEC_OMP_TASKYIELD:
+	case EXEC_OMP_WORKSHARE:
+	  res = gfc_trans_omp_directive (code);
+	  break;
+
+	default:
+	  internal_error ("gfc_trans_code(): Bad statement code");
+	}
+
+      gfc_set_backend_locus (&code->loc);
+
+      if (res != NULL_TREE && ! IS_EMPTY_STMT (res))
+	{
+	  if (TREE_CODE (res) != STATEMENT_LIST)
+	    SET_EXPR_LOCATION (res, input_location);
+
+	  /* Add the new statement to the block.  */
+	  gfc_add_expr_to_block (&block, res);
+	}
+    }
+
+  /* Return the finished block.  */
+  return gfc_finish_block (&block);
+}
+
+
+/* Translate an executable statement with condition, cond.  The condition is
+   used by gfc_trans_do to test for IO result conditions inside implied
+   DO loops of READ and WRITE statements.  See build_dt in trans-io.c.  */
+
+tree
+gfc_trans_code_cond (gfc_code * code, tree cond)
+{
+  return trans_code (code, cond);
+}
+
+/* Translate an executable statement without condition.  */
+
+tree
+gfc_trans_code (gfc_code * code)
+{
+  return trans_code (code, NULL_TREE);
+}
+
+
+/* This function is called after a complete program unit has been parsed
+   and resolved.  */
+
+void
+gfc_generate_code (gfc_namespace * ns)
+{
+  ompws_flags = 0;
+  if (ns->is_block_data)
+    {
+      gfc_generate_block_data (ns);
+      return;
+    }
+
+  gfc_generate_function_code (ns);
+}
+
+
+/* This function is called after a complete module has been parsed
+   and resolved.  */
+
+void
+gfc_generate_module_code (gfc_namespace * ns)
+{
+  gfc_namespace *n;
+  struct module_htab_entry *entry;
+
+  gcc_assert (ns->proc_name->backend_decl == NULL);
+  ns->proc_name->backend_decl
+    = build_decl (ns->proc_name->declared_at.lb->location,
+		  NAMESPACE_DECL, get_identifier (ns->proc_name->name),
+		  void_type_node);
+  entry = gfc_find_module (ns->proc_name->name);
+  if (entry->namespace_decl)
+    /* Buggy sourcecode, using a module before defining it?  */
+    htab_empty (entry->decls);
+  entry->namespace_decl = ns->proc_name->backend_decl;
+
+  gfc_generate_module_vars (ns);
+
+  /* We need to generate all module function prototypes first, to allow
+     sibling calls.  */
+  for (n = ns->contained; n; n = n->sibling)
+    {
+      gfc_entry_list *el;
+
+      if (!n->proc_name)
+        continue;
+
+      gfc_create_function_decl (n, false);
+      DECL_CONTEXT (n->proc_name->backend_decl) = ns->proc_name->backend_decl;
+      gfc_module_add_decl (entry, n->proc_name->backend_decl);
+      for (el = ns->entries; el; el = el->next)
+	{
+	  DECL_CONTEXT (el->sym->backend_decl) = ns->proc_name->backend_decl;
+	  gfc_module_add_decl (entry, el->sym->backend_decl);
+	}
+    }
+
+  for (n = ns->contained; n; n = n->sibling)
+    {
+      if (!n->proc_name)
+        continue;
+
+      gfc_generate_function_code (n);
+    }
+}
+
+
+/* Initialize an init/cleanup block with existing code.  */
+
+void
+gfc_start_wrapped_block (gfc_wrapped_block* block, tree code)
+{
+  gcc_assert (block);
+
+  block->init = NULL_TREE;
+  block->code = code;
+  block->cleanup = NULL_TREE;
+}
+
+
+/* Add a new pair of initializers/clean-up code.  */
+
+void
+gfc_add_init_cleanup (gfc_wrapped_block* block, tree init, tree cleanup)
+{
+  gcc_assert (block);
+
+  /* The new pair of init/cleanup should be "wrapped around" the existing
+     block of code, thus the initialization is added to the front and the
+     cleanup to the back.  */
+  add_expr_to_chain (&block->init, init, true);
+  add_expr_to_chain (&block->cleanup, cleanup, false);
+}
+
+
+/* Finish up a wrapped block by building a corresponding try-finally expr.  */
+
+tree
+gfc_finish_wrapped_block (gfc_wrapped_block* block)
+{
+  tree result;
+
+  gcc_assert (block);
+
+  /* Build the final expression.  For this, just add init and body together,
+     and put clean-up with that into a TRY_FINALLY_EXPR.  */
+  result = block->init;
+  add_expr_to_chain (&result, block->code, false);
+  if (block->cleanup)
+    result = build2_loc (input_location, TRY_FINALLY_EXPR, void_type_node,
+			 result, block->cleanup);
+
+  /* Clear the block.  */
+  block->init = NULL_TREE;
+  block->code = NULL_TREE;
+  block->cleanup = NULL_TREE;
+
+  return result;
+}
+
+
+/* Helper function for marking a boolean expression tree as unlikely.  */
+
+tree
+gfc_unlikely (tree cond, enum br_predictor predictor)
+{
+  tree tmp;
+
+  if (optimize)
+    {
+      cond = fold_convert (long_integer_type_node, cond);
+      tmp = build_zero_cst (long_integer_type_node);
+      cond = build_call_expr_loc (input_location,
+				  builtin_decl_explicit (BUILT_IN_EXPECT),
+				  3, cond, tmp,
+				  build_int_cst (integer_type_node,
+						 predictor));
+    }
+  cond = fold_convert (boolean_type_node, cond);
+  return cond;
+}
+
+
+/* Helper function for marking a boolean expression tree as likely.  */
+
+tree
+gfc_likely (tree cond, enum br_predictor predictor)
+{
+  tree tmp;
+
+  if (optimize)
+    {
+      cond = fold_convert (long_integer_type_node, cond);
+      tmp = build_one_cst (long_integer_type_node);
+      cond = build_call_expr_loc (input_location,
+				  builtin_decl_explicit (BUILT_IN_EXPECT),
+				  3, cond, tmp,
+				  build_int_cst (integer_type_node,
+						 predictor));
+    }
+  cond = fold_convert (boolean_type_node, cond);
+  return cond;
+}
+
+
+/* Get the string length for a deferred character length component.  */
+
+bool
+gfc_deferred_strlen (gfc_component *c, tree *decl)
+{
+  char name[GFC_MAX_SYMBOL_LEN+9];
+  gfc_component *strlen;
+  if (!(c->ts.type == BT_CHARACTER && c->ts.deferred))
+    return false;
+  sprintf (name, "_%s_length", c->name);
+  for (strlen = c; strlen; strlen = strlen->next)
+    if (strcmp (strlen->name, name) == 0)
+      break;
+  *decl = strlen ? strlen->backend_decl : NULL_TREE;
+  return strlen != NULL;
+}