gcc/cp/cp-cilkplus.c

   1 /* This file is part of the Intel(R) Cilk(TM) Plus support
   2    This file contains routines to handle Cilk Plus specific
   3    routines for the C++ Compiler.
   4    Copyright (C) 2013  Free Software Foundation, Inc.
   5    Contributed by Aldy Hernandez <aldyh@redhat.com>.
   6
   7    This file is part of GCC.
   8
   9    GCC is free software; you can redistribute it and/or modify it
  10    under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3, or (at your option)
  12    any later version.
  13
  14    GCC is distributed in the hope that it will be useful, but
  15    WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GCC; see the file COPYING3.  If not see
  21    <http://www.gnu.org/licenses/>.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "cp-tree.h"
  27 #include "diagnostic-core.h"
  28
  29
  30 /* Callback for cp_walk_tree to validate the body of a pragma simd loop
  31    or _cilk_for loop.
  32
  33    This function is passed in as a function pointer to walk_tree.  *TP is
  34    the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
  35    recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
  36    is set to false if an error has occured.  */
  37
  38 static tree
  39 cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
  40 {
  41   bool *valid = (bool *) data;
  42   location_t loc = EXPR_HAS_LOCATION (*tp) ? EXPR_LOCATION (*tp) :
  43     UNKNOWN_LOCATION;
  44
  45   if (!tp || !*tp)
  46     return NULL_TREE;
  47
  48   if (TREE_CODE (*tp) == THROW_EXPR)
  49     {
  50       error_at (loc, "throw expressions are not allowed inside loops "
  51                 "marked with pragma simd");
  52       *walk_subtrees = 0;
  53       *valid = false;
  54     }
  55   else if (TREE_CODE (*tp) == TRY_BLOCK)
  56     {
  57       error_at (loc, "try statements are not allowed inside loops marked "
  58                 "with #pragma simd");
  59       *valid = false;
  60       *walk_subtrees = 0;
  61     }
  62   return NULL_TREE;
  63 }
  64
  65
  66 /* Walks through all the subtrees of BODY using walk_tree to make sure
  67    invalid statements/expressions are not found inside BODY.  Returns
  68    false if any invalid statements are found.  */
  69
  70 bool
  71 cpp_validate_cilk_plus_loop (tree body)
  72 {
  73   bool valid = true;
  74   cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
  75                 (void *) &valid, NULL);
  76   return valid;
  77 }