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) 2013-2015 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 "cilk.h"
  31
  32 /* Callback for cp_walk_tree to validate the body of a pragma simd loop
  33    or _cilk_for loop.
  34
  35    This function is passed in as a function pointer to walk_tree.  *TP is
  36    the current tree pointer, *WALK_SUBTREES is set to 0 by this function if
  37    recursing into TP's subtrees is unnecessary. *DATA is a bool variable that
  38    is set to false if an error has occured.  */
  39
  40 static tree
  41 cpp_validate_cilk_plus_loop_aux (tree *tp, int *walk_subtrees, void *data)
  42 {
  43   bool *valid = (bool *) data;
  44
  45   if (!tp || !*tp)
  46     return NULL_TREE;
  47
  48   location_t loc = EXPR_LOCATION (*tp);
  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 }
  79
  80 /* Sets the EXCEPTION bit (0x10) in the FRAME.flags field.  */
  81
  82 static tree
  83 set_cilk_except_flag (tree frame)
  84 {
  85   tree flags = cilk_dot (frame, CILK_TI_FRAME_FLAGS, 0);
  86
  87   flags = build2 (MODIFY_EXPR, void_type_node, flags,
  88                   build2 (BIT_IOR_EXPR, TREE_TYPE (flags), flags,
  89                           build_int_cst (TREE_TYPE (flags),
  90                                          CILK_FRAME_EXCEPTING)));
  91   return flags;
  92 }
  93
  94 /* Sets the frame.EXCEPT_DATA field to the head of the exception pointer.  */
  95
  96 static tree
  97 set_cilk_except_data (tree frame)
  98 {
  99   tree except_data = cilk_dot (frame, CILK_TI_FRAME_EXCEPTION, 0);
 100   tree uresume_fn = builtin_decl_implicit (BUILT_IN_EH_POINTER);
 101   tree ret_expr;
 102   uresume_fn  = build_call_expr (uresume_fn, 1,
 103                                  build_int_cst (integer_type_node, 0));
 104   ret_expr = build2 (MODIFY_EXPR, void_type_node, except_data, uresume_fn);
 105   return ret_expr;
 106 }
 107
 108 /* Installs BODY into function FNDECL with appropriate exception handling
 109    code.  WD holds information of wrapper function used to pass into the
 110    outlining function, cilk_outline.  */
 111
 112 void
 113 cilk_install_body_with_frame_cleanup (tree fndecl, tree orig_body, void *wd)
 114 {
 115   tree frame = make_cilk_frame (fndecl);
 116   tree dtor = create_cilk_function_exit (frame, false, false);
 117   add_local_decl (cfun, frame);
 118
 119   cfun->language = ggc_cleared_alloc<language_function> ();
 120
 121   location_t loc = EXPR_LOCATION (orig_body);
 122   tree list = alloc_stmt_list ();
 123   DECL_SAVED_TREE (fndecl) = list;
 124   tree fptr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (frame)), frame);
 125   tree body = cilk_install_body_pedigree_operations (fptr);
 126   gcc_assert (TREE_CODE (body) == STATEMENT_LIST);
 127   tree detach_expr = build_call_expr (cilk_detach_fndecl, 1, fptr);
 128   append_to_statement_list (detach_expr, &body);
 129   cilk_outline (fndecl, &orig_body, (struct wrapper_data *) wd);
 130   append_to_statement_list (orig_body, &body);
 131   if (flag_exceptions)
 132     {
 133       tree except_flag = set_cilk_except_flag (frame);
 134       tree except_data = set_cilk_except_data (frame);
 135       tree catch_list = alloc_stmt_list ();
 136       append_to_statement_list (except_flag, &catch_list);
 137       append_to_statement_list (except_data, &catch_list);
 138       body = create_try_catch_expr (body, catch_list);
 139     }
 140   append_to_statement_list (build_stmt (loc, TRY_FINALLY_EXPR, body, dtor),
 141                             &list);
 142 }