gcc/cfghooks.h

   1 /* Hooks for cfg representation specific functions.
   2    Copyright (C) 2003 Free Software Foundation, Inc.
   3    Contributed by Sebastian Pop <s.pop@laposte.net>
   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 2, 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 COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef GCC_CFGHOOKS_H
  23 #define GCC_CFGHOOKS_H
  24
  25 struct cfg_hooks
  26 {
  27   /* Debugging.  Do not use macros to hook these so they can be called from
  28      debugger!  */
  29   int (*cfgh_verify_flow_info) (void);
  30   void (*dump_bb) (basic_block, FILE *);
  31
  32   /* Basic CFG manipulation.  */
  33
  34   /* Return new basic block.  */
  35   basic_block (*create_basic_block) (void *head, void *end, basic_block after);
  36
  37   /* Redirect edge E to the given basic block B and update underlying program
  38      representation.  Returns false when edge is not easily redirectable for
  39      whatever reason.  */
  40   bool (*redirect_edge_and_branch) (edge e, basic_block b);
  41
  42   /* Same as the above but allows redirecting of fallthru edges.  In that case
  43      newly created forwarder basic block is returned.  It aborts when called
  44      on abnormal edge.  */
  45   basic_block (*redirect_edge_and_branch_force) (edge, basic_block);
  46
  47   /* Remove given basic block and all edges possibly pointing into it.  */
  48   void (*delete_block) (basic_block);
  49
  50   /* Split basic block B after specified instruction I.  */
  51   edge (*split_block) (basic_block b, void * i);
  52
  53   /* Return true when blocks A and B can be merged into single basic block.  */
  54   bool (*can_merge_blocks_p) (basic_block a, basic_block b);
  55
  56   /* Merge blocks A and B.  */
  57   void (*merge_blocks) (basic_block a, basic_block b);
  58
  59   /* Higher level functions representable by primitive operations above if
  60      we didn't have some oddities in RTL and Tree representations.  */
  61   basic_block (*cfgh_split_edge) (edge);
  62 };
  63
  64 #define redirect_edge_and_branch(e,b)        cfg_hooks->redirect_edge_and_branch (e,b)
  65 #define redirect_edge_and_branch_force(e,b)  cfg_hooks->redirect_edge_and_branch_force (e,b)
  66 #define split_block(e,i)                     cfg_hooks->split_block (e,i)
  67 #define delete_block(b)                      cfg_hooks->delete_block (b)
  68 #define split_edge(e)                        cfg_hooks->cfgh_split_edge (e)
  69 #define create_basic_block(h,e,a)            cfg_hooks->create_basic_block (h,e,a)
  70 #define can_merge_blocks_p(a,b)              cfg_hooks->can_merge_blocks_p (a,b)
  71 #define merge_blocks(a,b)                    cfg_hooks->merge_blocks (a,b)
  72
  73 /* Hooks containers.  */
  74 extern struct cfg_hooks rtl_cfg_hooks;
  75
  76 /* A pointer to one of the hooks containers.  */
  77 extern struct cfg_hooks *cfg_hooks;
  78
  79 /* Declarations.  */
  80 extern void rtl_register_cfg_hooks (void);
  81 extern void cfg_layout_rtl_register_cfg_hooks (void);
  82
  83 #endif  /* GCC_CFGHOOKS_H */