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1 /* Control flow graph manipulation code header file.
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2 Copyright (C) 2014-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_CFG_H
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21 #define GCC_CFG_H
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22
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23 #include "dominance.h"
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24
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25 /* What sort of profiling information we have. */
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26 enum profile_status_d
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27 {
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28 PROFILE_ABSENT,
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29 PROFILE_GUESSED,
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30 PROFILE_READ,
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31 PROFILE_LAST /* Last value, used by profile streaming. */
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32 };
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33
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34 /* A structure to group all the per-function control flow graph data.
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35 The x_* prefixing is necessary because otherwise references to the
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36 fields of this struct are interpreted as the defines for backward
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37 source compatibility following the definition of this struct. */
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38 struct GTY(()) control_flow_graph {
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39 /* Block pointers for the exit and entry of a function.
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40 These are always the head and tail of the basic block list. */
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41 basic_block x_entry_block_ptr;
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42 basic_block x_exit_block_ptr;
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43
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44 /* Index by basic block number, get basic block struct info. */
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45 vec<basic_block, va_gc> *x_basic_block_info;
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46
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47 /* Number of basic blocks in this flow graph. */
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48 int x_n_basic_blocks;
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49
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50 /* Number of edges in this flow graph. */
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51 int x_n_edges;
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52
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53 /* The first free basic block number. */
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54 int x_last_basic_block;
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55
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56 /* UIDs for LABEL_DECLs. */
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57 int last_label_uid;
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58
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59 /* Mapping of labels to their associated blocks. At present
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60 only used for the gimple CFG. */
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61 vec<basic_block, va_gc> *x_label_to_block_map;
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62
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63 enum profile_status_d x_profile_status;
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64
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65 /* Whether the dominators and the postdominators are available. */
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66 enum dom_state x_dom_computed[2];
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67
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68 /* Number of basic blocks in the dominance tree. */
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69 unsigned x_n_bbs_in_dom_tree[2];
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70
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71 /* Maximal number of entities in the single jumptable. Used to estimate
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72 final flowgraph size. */
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73 int max_jumptable_ents;
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74 };
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75
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76
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77 extern void init_flow (function *);
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78 extern void clear_edges (function *);
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79 extern basic_block alloc_block (void);
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80 extern void link_block (basic_block, basic_block);
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81 extern void unlink_block (basic_block);
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82 extern void compact_blocks (void);
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83 extern void expunge_block (basic_block);
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84 extern edge unchecked_make_edge (basic_block, basic_block, int);
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85 extern edge cached_make_edge (sbitmap, basic_block, basic_block, int);
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86 extern edge make_edge (basic_block, basic_block, int);
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87 extern edge make_single_succ_edge (basic_block, basic_block, int);
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88 extern void remove_edge_raw (edge);
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89 extern void redirect_edge_succ (edge, basic_block);
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90 extern void redirect_edge_pred (edge, basic_block);
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91 extern void clear_bb_flags (void);
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92 extern void dump_edge_info (FILE *, edge, dump_flags_t, int);
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93 extern void debug (edge_def &ref);
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94 extern void debug (edge_def *ptr);
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95 extern void alloc_aux_for_blocks (int);
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96 extern void clear_aux_for_blocks (void);
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97 extern void free_aux_for_blocks (void);
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98 extern void alloc_aux_for_edge (edge, int);
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99 extern void alloc_aux_for_edges (int);
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100 extern void clear_aux_for_edges (void);
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101 extern void free_aux_for_edges (void);
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102 extern void debug_bb (basic_block);
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103 extern basic_block debug_bb_n (int);
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104 extern void dump_bb_info (FILE *, basic_block, int, dump_flags_t, bool, bool);
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105 extern void brief_dump_cfg (FILE *, dump_flags_t);
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106 extern void update_bb_profile_for_threading (basic_block, int, profile_count, edge);
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107 extern void scale_bbs_frequencies_int (basic_block *, int, int, int);
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108 extern void scale_bbs_frequencies_gcov_type (basic_block *, int, gcov_type,
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109 gcov_type);
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110 extern void scale_bbs_frequencies_profile_count (basic_block *, int,
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111 profile_count, profile_count);
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112 extern void scale_bbs_frequencies (basic_block *, int, profile_probability);
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113 extern void initialize_original_copy_tables (void);
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114 extern void reset_original_copy_tables (void);
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115 extern void free_original_copy_tables (void);
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116 extern bool original_copy_tables_initialized_p (void);
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117 extern void set_bb_original (basic_block, basic_block);
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118 extern basic_block get_bb_original (basic_block);
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119 extern void set_bb_copy (basic_block, basic_block);
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120 extern basic_block get_bb_copy (basic_block);
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121 void set_loop_copy (struct loop *, struct loop *);
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122 struct loop *get_loop_copy (struct loop *);
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123
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124 #endif /* GCC_CFG_H */
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