/* This file is part of the Intel(R) Cilk(TM) Plus support
   This file contains routines to handle Cilk Plus specific
   routines for the C++ Compiler.
   Copyright (C) 2013  Free Software Foundation, Inc.
   Contributed by Aldy Hernandez <aldyh@redhat.com>.

   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 "cp-tree.h"
#include "diagnostic-core.h"


/* Callback for cp_walk_tree to validate the body of a pragma simd loop
   or _cilk_for loop.

   This function is passed in as a function pointer to walk_tree.  *TP is
   the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
   recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
   is set to false if an error has occured.  */

static tree
cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
{
  bool *valid = (bool *) data;
  location_t loc = EXPR_HAS_LOCATION (*tp) ? EXPR_LOCATION (*tp) :
    UNKNOWN_LOCATION;

  if (!tp || !*tp)
    return NULL_TREE;

  if (TREE_CODE (*tp) == THROW_EXPR)
    {
      error_at (loc, "throw expressions are not allowed inside loops "
		"marked with pragma simd");
      *walk_subtrees = 0;
      *valid = false;
    }
  else if (TREE_CODE (*tp) == TRY_BLOCK)
    {
      error_at (loc, "try statements are not allowed inside loops marked "
		"with #pragma simd");
      *valid = false;
      *walk_subtrees = 0;
    }
  return NULL_TREE;
}  


/* Walks through all the subtrees of BODY using walk_tree to make sure
   invalid statements/expressions are not found inside BODY.  Returns
   false if any invalid statements are found.  */

bool
cpp_validate_cilk_plus_loop (tree body)
{
  bool valid = true;
  cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
		(void *) &valid, NULL);
  return valid;
}