gcc/shrink-wrap.h

   1 /* Shrink-wrapping related functions.
   2    Copyright (C) 1989-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_SHRINK_WRAP_H
  21 #define GCC_SHRINK_WRAP_H
  22
  23 #include "hashtab.h"
  24 #include "vec.h"
  25 #include "machmode.h"
  26
  27 #ifdef HAVE_simple_return
  28 /* In function.c.  */
  29 extern void emit_return_into_block (bool simple_p, basic_block bb);
  30 extern bool active_insn_between (rtx_insn *head, rtx_insn *tail);
  31 extern vec<edge> convert_jumps_to_returns (basic_block last_bb, bool simple_p,
  32                                            vec<edge> unconverted);
  33 extern basic_block emit_return_for_exit (edge exit_fallthru_edge,
  34                                          bool simple_p);
  35
  36 /* In shrink-wrap.c.  */
  37 extern bool requires_stack_frame_p (rtx_insn *, HARD_REG_SET, HARD_REG_SET);
  38 extern void prepare_shrink_wrap (basic_block entry_block);
  39 extern void dup_block_and_redirect (basic_block bb, basic_block copy_bb,
  40                                     rtx_insn *before,
  41                                     bitmap_head *need_prologue);
  42 extern void try_shrink_wrapping (edge *entry_edge, edge orig_entry_edge,
  43                                  bitmap_head *bb_flags, rtx_insn *prologue_seq);
  44 extern edge get_unconverted_simple_return (edge, bitmap_head,
  45                                            vec<edge> *, rtx_insn **);
  46 extern void convert_to_simple_return (edge entry_edge, edge orig_entry_edge,
  47                                       bitmap_head bb_flags,
  48                                       rtx_insn *returnjump,
  49                                       vec<edge> unconverted_simple_returns);
  50 #define SHRINK_WRAPPING_ENABLED (flag_shrink_wrap && HAVE_simple_return)
  51 #else
  52 #define SHRINK_WRAPPING_ENABLED false
  53 #endif
  54
  55 #endif  /* GCC_SHRINK_WRAP_H  */
  56
  57