1 /* Control flow graph manipulation code header file. 2 Copyright (C) 2014-2016 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_CFG_H 21 #define GCC_CFG_H 22 23 #include "dominance.h" 24 25 /* What sort of profiling information we have. */ 26 enum profile_status_d 27 { 28 PROFILE_ABSENT, 29 PROFILE_GUESSED, 30 PROFILE_READ, 31 PROFILE_LAST /* Last value, used by profile streaming. */ 32 }; 33 34 /* A structure to group all the per-function control flow graph data. 35 The x_* prefixing is necessary because otherwise references to the 36 fields of this struct are interpreted as the defines for backward 37 source compatibility following the definition of this struct. */ 38 struct GTY(()) control_flow_graph { 39 /* Block pointers for the exit and entry of a function. 40 These are always the head and tail of the basic block list. */ 41 basic_block x_entry_block_ptr; 42 basic_block x_exit_block_ptr; 43 44 /* Index by basic block number, get basic block struct info. */ 45 vec<basic_block, va_gc> *x_basic_block_info; 46 47 /* Number of basic blocks in this flow graph. */ 48 int x_n_basic_blocks; 49 50 /* Number of edges in this flow graph. */ 51 int x_n_edges; 52 53 /* The first free basic block number. */ 54 int x_last_basic_block; 55 56 /* UIDs for LABEL_DECLs. */ 57 int last_label_uid; 58 59 /* Mapping of labels to their associated blocks. At present 60 only used for the gimple CFG. */ 61 vec<basic_block, va_gc> *x_label_to_block_map; 62 63 enum profile_status_d x_profile_status; 64 65 /* Whether the dominators and the postdominators are available. */ 66 enum dom_state x_dom_computed[2]; 67 68 /* Number of basic blocks in the dominance tree. */ 69 unsigned x_n_bbs_in_dom_tree[2]; 70 71 /* Maximal number of entities in the single jumptable. Used to estimate 72 final flowgraph size. */ 73 int max_jumptable_ents; 74 }; 75 76 77 extern void init_flow (function *); 78 extern void clear_edges (function *); 79 extern basic_block alloc_block (void); 80 extern void link_block (basic_block, basic_block); 81 extern void unlink_block (basic_block); 82 extern void compact_blocks (void); 83 extern void expunge_block (basic_block); 84 extern edge unchecked_make_edge (basic_block, basic_block, int); 85 extern edge cached_make_edge (sbitmap, basic_block, basic_block, int); 86 extern edge make_edge (basic_block, basic_block, int); 87 extern edge make_single_succ_edge (basic_block, basic_block, int); 88 extern void remove_edge_raw (edge); 89 extern void redirect_edge_succ (edge, basic_block); 90 extern void redirect_edge_pred (edge, basic_block); 91 extern void clear_bb_flags (void); 92 extern void dump_edge_info (FILE *, edge, int, int); 93 extern void debug (edge_def &ref); 94 extern void debug (edge_def *ptr); 95 extern void alloc_aux_for_blocks (int); 96 extern void clear_aux_for_blocks (void); 97 extern void free_aux_for_blocks (void); 98 extern void alloc_aux_for_edge (edge, int); 99 extern void alloc_aux_for_edges (int); 100 extern void clear_aux_for_edges (void); 101 extern void free_aux_for_edges (void); 102 extern void debug_bb (basic_block); 103 extern basic_block debug_bb_n (int); 104 extern void dump_bb_info (FILE *, basic_block, int, int, bool, bool); 105 extern void brief_dump_cfg (FILE *, int); 106 extern void update_bb_profile_for_threading (basic_block, int, gcov_type, edge); 107 extern void scale_bbs_frequencies_int (basic_block *, int, int, int); 108 extern void scale_bbs_frequencies_gcov_type (basic_block *, int, gcov_type, 109 gcov_type); 110 extern void initialize_original_copy_tables (void); 111 extern void free_original_copy_tables (void); 112 extern void set_bb_original (basic_block, basic_block); 113 extern basic_block get_bb_original (basic_block); 114 extern void set_bb_copy (basic_block, basic_block); 115 extern basic_block get_bb_copy (basic_block); 116 void set_loop_copy (struct loop *, struct loop *); 117 struct loop *get_loop_copy (struct loop *); 118 119 #endif /* GCC_CFG_H */ 120