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