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) 2013-2016 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 "tree-iterator.h"
  28 #include "cilk.h"
  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
  43   if (!tp || !*tp)
  44     return NULL_TREE;
  45
  46   location_t loc = EXPR_LOCATION (*tp);
  47   if (TREE_CODE (*tp) == THROW_EXPR)
  48     {
  49       error_at (loc, "throw expressions are not allowed inside loops "
  50                 "marked with pragma simd");
  51       *walk_subtrees = 0;
  52       *valid = false;
  53     }
  54   else if (TREE_CODE (*tp) == TRY_BLOCK)
  55     {
  56       error_at (loc, "try statements are not allowed inside loops marked "
  57                 "with #pragma simd");
  58       *valid = false;
  59       *walk_subtrees = 0;
  60     }
  61   return NULL_TREE;
  62 }
  63
  64
  65 /* Walks through all the subtrees of BODY using walk_tree to make sure
  66    invalid statements/expressions are not found inside BODY.  Returns
  67    false if any invalid statements are found.  */
  68
  69 bool
  70 cpp_validate_cilk_plus_loop (tree body)
  71 {
  72   bool valid = true;
  73   cp_walk_tree (&body, cpp_validate_cilk_plus_loop_aux,
  74                 (void *) &valid, NULL);
  75   return valid;
  76 }
  77
  78 /* Sets the EXCEPTION bit (0x10) in the FRAME.flags field.  */
  79
  80 static tree
  81 set_cilk_except_flag (tree frame)
  82 {
  83   tree flags = cilk_dot (frame, CILK_TI_FRAME_FLAGS, 0);
  84
  85   flags = build2 (MODIFY_EXPR, void_type_node, flags,
  86                   build2 (BIT_IOR_EXPR, TREE_TYPE (flags), flags,
  87                           build_int_cst (TREE_TYPE (flags),
  88                                          CILK_FRAME_EXCEPTING)));
  89   return flags;
  90 }
  91
  92 /* Sets the frame.EXCEPT_DATA field to the head of the exception pointer.  */
  93
  94 static tree
  95 set_cilk_except_data (tree frame)
  96 {
  97   tree except_data = cilk_dot (frame, CILK_TI_FRAME_EXCEPTION, 0);
  98   tree uresume_fn = builtin_decl_implicit (BUILT_IN_EH_POINTER);
  99   tree ret_expr;
 100   uresume_fn  = build_call_expr (uresume_fn, 1,
 101                                  build_int_cst (integer_type_node, 0));
 102   ret_expr = build2 (MODIFY_EXPR, void_type_node, except_data, uresume_fn);
 103   return ret_expr;
 104 }
 105
 106 /* Installs BODY into function FNDECL with appropriate exception handling
 107    code.  WD holds information of wrapper function used to pass into the
 108    outlining function, cilk_outline.  */
 109
 110 void
 111 cilk_install_body_with_frame_cleanup (tree fndecl, tree orig_body, void *wd)
 112 {
 113   tree frame = make_cilk_frame (fndecl);
 114   tree dtor = create_cilk_function_exit (frame, false, false);
 115   add_local_decl (cfun, frame);
 116
 117   cfun->language = ggc_cleared_alloc<language_function> ();
 118
 119   location_t loc = EXPR_LOCATION (orig_body);
 120   tree list = alloc_stmt_list ();
 121   DECL_SAVED_TREE (fndecl) = list;
 122   tree fptr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (frame)), frame);
 123   tree body = cilk_install_body_pedigree_operations (fptr);
 124   gcc_assert (TREE_CODE (body) == STATEMENT_LIST);
 125   tree detach_expr = build_call_expr (cilk_detach_fndecl, 1, fptr);
 126   append_to_statement_list (detach_expr, &body);
 127   cilk_outline (fndecl, &orig_body, (struct wrapper_data *) wd);
 128   append_to_statement_list (orig_body, &body);
 129   if (flag_exceptions)
 130     {
 131       tree except_flag = set_cilk_except_flag (frame);
 132       tree except_data = set_cilk_except_data (frame);
 133       tree catch_list = alloc_stmt_list ();
 134       append_to_statement_list (except_flag, &catch_list);
 135       append_to_statement_list (except_data, &catch_list);
 136       body = create_try_catch_expr (body, catch_list);
 137     }
 138   append_to_statement_list (build_stmt (loc, TRY_FINALLY_EXPR, body, dtor),
 139                             &list);
 140 }