gcc/tree-ssa-threadupdate.h

   1 /* Communication between registering jump thread requests and
   2    updating the SSA/CFG for jump threading.
   3    Copyright (C) 2013-2017 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _TREE_SSA_THREADUPDATE_H
  22 #define _TREE_SSA_THREADUPDATE_H 1
  23
  24 /* In tree-ssa-threadupdate.c.  */
  25 extern bool thread_through_all_blocks (bool);
  26 enum jump_thread_edge_type
  27 {
  28   EDGE_START_JUMP_THREAD,
  29   EDGE_FSM_THREAD,
  30   EDGE_COPY_SRC_BLOCK,
  31   EDGE_COPY_SRC_JOINER_BLOCK,
  32   EDGE_NO_COPY_SRC_BLOCK
  33 };
  34
  35 class jump_thread_edge
  36 {
  37 public:
  38   jump_thread_edge (edge e, enum jump_thread_edge_type type)
  39     : e (e), type (type) {}
  40
  41   edge e;
  42   enum jump_thread_edge_type type;
  43 };
  44
  45 extern void register_jump_thread (vec <class jump_thread_edge *> *);
  46 extern void remove_jump_threads_including (edge);
  47 extern void delete_jump_thread_path (vec <class jump_thread_edge *> *);
  48 extern void remove_ctrl_stmt_and_useless_edges (basic_block, basic_block);
  49 extern void free_dom_edge_info (edge);
  50
  51 enum bb_dom_status
  52 {
  53   /* BB does not dominate latch of the LOOP.  */
  54   DOMST_NONDOMINATING,
  55   /* The LOOP is broken (there is no path from the header to its latch.  */
  56   DOMST_LOOP_BROKEN,
  57   /* BB dominates the latch of the LOOP.  */
  58   DOMST_DOMINATING
  59 };
  60
  61 enum bb_dom_status determine_bb_domination_status (struct loop *, basic_block);
  62
  63 #endif