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) 2013-2014 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 #include "tree-iterator.h"
  29 #include "tree-inline.h"  /* for copy_tree_body_r.  */
  30 #include "ggc.h"
  31 #include "cilk.h"
  32
  33 /* Callback for cp_walk_tree to validate the body of a pragma simd loop
  34    or _cilk_for loop.
  35
  36    This function is passed in as a function pointer to walk_tree.  *TP is
  37    the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
  38    recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
  39    is set to false if an error has occured.  */
  40
  41 static tree
  42 cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
  43 {
  44   bool *valid = (bool *) data;
  45   location_t loc = EXPR_HAS_LOCATION (*tp) ? EXPR_LOCATION (*tp) :
  46     UNKNOWN_LOCATION;
  47
  48   if (!tp || !*tp)
  49     return NULL_TREE;
  50
  51   if (TREE_CODE (*tp) == THROW_EXPR)
  52     {
  53       error_at (loc, "throw expressions are not allowed inside loops "
  54                 "marked with pragma simd");
  55       *walk_subtrees = 0;
  56       *valid = false;
  57     }
  58   else if (TREE_CODE (*tp) == TRY_BLOCK)
  59     {
  60       error_at (loc, "try statements are not allowed inside loops marked "
  61                 "with #pragma simd");
  62       *valid = false;
  63       *walk_subtrees = 0;
  64     }
  65   return NULL_TREE;
  66 }
  67
  68
  69 /* Walks through all the subtrees of BODY using walk_tree to make sure
  70    invalid statements/expressions are not found inside BODY.  Returns
  71    false if any invalid statements are found.  */
  72
  73 bool
  74 cpp_validate_cilk_plus_loop (tree body)
  75 {
  76   bool valid = true;
  77   cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
  78                 (void *) &valid, NULL);
  79   return valid;
  80 }
  81
  82 /* Sets the EXCEPTION bit (0x10) in the FRAME.flags field.  */
  83
  84 static tree
  85 set_cilk_except_flag (tree frame)
  86 {
  87   tree flags = cilk_dot (frame, CILK_TI_FRAME_FLAGS, 0);
  88
  89   flags = build2 (MODIFY_EXPR, void_type_node, flags,
  90                   build2 (BIT_IOR_EXPR, TREE_TYPE (flags), flags,
  91                           build_int_cst (TREE_TYPE (flags),
  92                                          CILK_FRAME_EXCEPTING)));
  93   return flags;
  94 }
  95
  96 /* Sets the frame.EXCEPT_DATA field to the head of the exception pointer.  */
  97
  98 static tree
  99 set_cilk_except_data (tree frame)
 100 {
 101   tree except_data = cilk_dot (frame, CILK_TI_FRAME_EXCEPTION, 0);
 102   tree uresume_fn = builtin_decl_implicit (BUILT_IN_EH_POINTER);
 103   tree ret_expr;
 104   uresume_fn  = build_call_expr (uresume_fn, 1,
 105                                  build_int_cst (integer_type_node, 0));
 106   ret_expr = build2 (MODIFY_EXPR, void_type_node, except_data, uresume_fn);
 107   return ret_expr;
 108 }
 109
 110 /* Installs BODY into function FNDECL with appropriate exception handling
 111    code.  WD holds information of wrapper function used to pass into the
 112    outlining function, cilk_outline.  */
 113
 114 void
 115 cilk_install_body_with_frame_cleanup (tree fndecl, tree orig_body, void *wd)
 116 {
 117   tree frame = make_cilk_frame (fndecl);
 118   tree dtor = create_cilk_function_exit (frame, false, false);
 119   add_local_decl (cfun, frame);
 120
 121   cfun->language = ggc_cleared_alloc<language_function> ();
 122
 123   location_t loc = EXPR_LOCATION (orig_body);
 124   tree list = alloc_stmt_list ();
 125   DECL_SAVED_TREE (fndecl) = list;
 126   tree fptr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (frame)), frame);
 127   tree body = cilk_install_body_pedigree_operations (fptr);
 128   gcc_assert (TREE_CODE (body) == STATEMENT_LIST);
 129   tree detach_expr = build_call_expr (cilk_detach_fndecl, 1, fptr);
 130   append_to_statement_list (detach_expr, &body);
 131   cilk_outline (fndecl, &orig_body, (struct wrapper_data *) wd);
 132   append_to_statement_list (orig_body, &body);
 133   if (flag_exceptions)
 134     {
 135       tree except_flag = set_cilk_except_flag (frame);
 136       tree except_data = set_cilk_except_data (frame);
 137       tree catch_list = alloc_stmt_list ();
 138       append_to_statement_list (except_flag, &catch_list);
 139       append_to_statement_list (except_data, &catch_list);
 140       body = create_try_catch_expr (body, catch_list);
 141     }
 142   append_to_statement_list (build_stmt (loc, TRY_FINALLY_EXPR, body, dtor),
 143                             &list);
 144 }
 145