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/* Control flow graph analysis header file.
Copyright (C) 2014-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_CFGANAL_H
#define GCC_CFGANAL_H
/* This structure maintains an edge list vector. */
/* FIXME: Make this a vec<edge>. */
struct edge_list
{
int num_edges;
edge *index_to_edge;
};
/* Class to compute and manage control dependences on an edge-list. */
class control_dependences
{
public:
control_dependences ();
~control_dependences ();
bitmap get_edges_dependent_on (int);
basic_block get_edge_src (int);
basic_block get_edge_dest (int);
private:
void set_control_dependence_map_bit (basic_block, int);
void clear_control_dependence_bitmap (basic_block);
void find_control_dependence (int);
vec<bitmap_head> control_dependence_map;
vec<std::pair<int, int> > m_el;
bitmap_obstack m_bitmaps;
};
extern bool mark_dfs_back_edges (struct function *);
extern bool mark_dfs_back_edges (void);
extern void verify_marked_backedges (struct function *);
extern void find_unreachable_blocks (void);
extern void verify_no_unreachable_blocks (void);
struct edge_list * create_edge_list (void);
void free_edge_list (struct edge_list *);
void print_edge_list (FILE *, struct edge_list *);
void verify_edge_list (FILE *, struct edge_list *);
edge find_edge (basic_block, basic_block);
int find_edge_index (struct edge_list *, basic_block, basic_block);
extern void remove_fake_edges (void);
extern void remove_fake_exit_edges (void);
extern void add_noreturn_fake_exit_edges (void);
extern void connect_infinite_loops_to_exit (void);
extern int post_order_compute (int *, bool, bool);
extern basic_block dfs_find_deadend (basic_block);
extern void inverted_post_order_compute (vec<int> *postorder, sbitmap *start_points = 0);
extern int pre_and_rev_post_order_compute_fn (struct function *,
int *, int *, bool);
extern int pre_and_rev_post_order_compute (int *, int *, bool);
extern int rev_post_order_and_mark_dfs_back_seme (struct function *, edge,
bitmap, bool, int *,
vec<std::pair<int, int> > *);
extern int dfs_enumerate_from (basic_block, int,
bool (*)(const_basic_block, const void *),
basic_block *, int, const void *);
extern void compute_dominance_frontiers (class bitmap_head *);
extern bitmap compute_idf (bitmap, class bitmap_head *);
extern void bitmap_intersection_of_succs (sbitmap, sbitmap *, basic_block);
extern void bitmap_intersection_of_preds (sbitmap, sbitmap *, basic_block);
extern void bitmap_union_of_succs (sbitmap, sbitmap *, basic_block);
extern void bitmap_union_of_preds (sbitmap, sbitmap *, basic_block);
extern basic_block * single_pred_before_succ_order (void);
extern edge single_incoming_edge_ignoring_loop_edges (basic_block, bool);
extern edge single_pred_edge_ignoring_loop_edges (basic_block, bool);
#endif /* GCC_CFGANAL_H */
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