gcc/cfghooks.h

   1 /* Hooks for cfg representation specific functions.
   2    Copyright (C) 2003, 2004 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   /* Name of the corresponding ir.  */
  28   const char *name;
  29
  30   /* Debugging.  */
  31   int (*verify_flow_info) (void);
  32   void (*dump_bb) (basic_block, FILE *, int);
  33
  34   /* Basic CFG manipulation.  */
  35
  36   /* Return new basic block.  */
  37   basic_block (*create_basic_block) (void *head, void *end, basic_block after);
  38
  39   /* Redirect edge E to the given basic block B and update underlying program
  40      representation.  Returns false when edge is not easily redirectable for
  41      whatever reason.  */
  42   bool (*redirect_edge_and_branch) (edge e, basic_block b);
  43
  44   /* Same as the above but allows redirecting of fallthru edges.  In that case
  45      newly created forwarder basic block is returned.  It aborts when called
  46      on abnormal edge.  */
  47   basic_block (*redirect_edge_and_branch_force) (edge, basic_block);
  48
  49   /* Remove statements corresponding to a given basic block.  */
  50   void (*delete_basic_block) (basic_block);
  51
  52   /* Creates a new basic block just after basic block B by splitting
  53      everything after specified instruction I.  */
  54   basic_block (*split_block) (basic_block b, void * i);
  55
  56   /* Move block B immediately after block A.  */
  57   bool (*move_block_after) (basic_block b, basic_block a);
  58
  59   /* Return true when blocks A and B can be merged into single basic block.  */
  60   bool (*can_merge_blocks_p) (basic_block a, basic_block b);
  61
  62   /* Merge blocks A and B.  */
  63   void (*merge_blocks) (basic_block a, basic_block b);
  64
  65   /* Higher level functions representable by primitive operations above if
  66      we didn't have some oddities in RTL and Tree representations.  */
  67   basic_block (*split_edge) (edge);
  68   void (*make_forwarder_block) (edge);
  69
  70   /* Tries to make the edge fallthru.  */
  71   void (*tidy_fallthru_edge) (edge);
  72 };
  73
  74 extern void verify_flow_info (void);
  75 extern void dump_bb (basic_block, FILE *, int);
  76 extern bool redirect_edge_and_branch (edge, basic_block);
  77 extern basic_block redirect_edge_and_branch_force (edge, basic_block);
  78 extern edge split_block (basic_block, void *);
  79 extern edge split_block_after_labels (basic_block);
  80 extern bool move_block_after (basic_block, basic_block);
  81 extern void delete_basic_block (basic_block);
  82 extern basic_block split_edge (edge);
  83 extern basic_block create_basic_block (void *, void *, basic_block);
  84 extern basic_block create_empty_bb (basic_block);
  85 extern bool can_merge_blocks_p (basic_block, basic_block);
  86 extern void merge_blocks (basic_block, basic_block);
  87 extern edge make_forwarder_block (basic_block, bool (*)(edge),
  88                                   void (*) (basic_block));
  89 extern void tidy_fallthru_edge (edge);
  90 extern void tidy_fallthru_edges (void);
  91
  92 /* Hooks containers.  */
  93 extern struct cfg_hooks rtl_cfg_hooks;
  94 extern struct cfg_hooks cfg_layout_rtl_cfg_hooks;
  95
  96 /* Declarations.  */
  97 extern void rtl_register_cfg_hooks (void);
  98 extern void cfg_layout_rtl_register_cfg_hooks (void);
  99
 100 #endif  /* GCC_CFGHOOKS_H */