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 Balaji V. Iyer <balaji.v.iyer@intel.com>,
   6                   Aldy Hernandez <aldyh@redhat.com>.
   7
   8    This file is part of GCC.
   9
  10    GCC is free software; you can redistribute it and/or modify it
  11    under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3, or (at your option)
  13    any later version.
  14
  15    GCC is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GCC; see the file COPYING3.  If not see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "cp-tree.h"
  28 #include "diagnostic-core.h"
  29
  30
  31 /* Callback for cp_walk_tree to validate the body of a pragma simd loop
  32    or _cilk_for loop.
  33
  34    This function is passed in as a function pointer to walk_tree.  *TP is
  35    the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
  36    recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
  37    is set to false if an error has occured.  */
  38
  39 static tree
  40 cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
  41 {
  42   bool *valid = (bool *) data;
  43   location_t loc = EXPR_HAS_LOCATION (*tp) ? EXPR_LOCATION (*tp) :
  44     UNKNOWN_LOCATION;
  45
  46   if (!tp || !*tp)
  47     return NULL_TREE;
  48
  49   if (TREE_CODE (*tp) == THROW_EXPR)
  50     {
  51       error_at (loc, "throw expressions are not allowed inside loops "
  52                 "marked with pragma simd");
  53       *walk_subtrees = 0;
  54       *valid = false;
  55     }
  56   else if (TREE_CODE (*tp) == TRY_BLOCK)
  57     {
  58       error_at (loc, "try statements are not allowed inside loops marked "
  59                 "with #pragma simd");
  60       *valid = false;
  61       *walk_subtrees = 0;
  62     }
  63   return NULL_TREE;
  64 }
  65
  66
  67 /* Walks through all the subtrees of BODY using walk_tree to make sure
  68    invalid statements/expressions are not found inside BODY.  Returns
  69    false if any invalid statements are found.  */
  70
  71 bool
  72 cpp_validate_cilk_plus_loop (tree body)
  73 {
  74   bool valid = true;
  75   cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
  76                 (void *) &valid, NULL);
  77   return valid;
  78 }