gimple-ssa-evrp-analyze.h revision 1.1.1.2 
1/* Support routines for Value Range Propagation (VRP).
2   Copyright (C) 2016-2019 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#ifndef GCC_GIMPLE_SSA_EVRP_ANALYZE_H
21#define GCC_GIMPLE_SSA_EVRP_ANALYZE_H
22
23class evrp_range_analyzer
24{
25 public:
26  evrp_range_analyzer (bool update_global_ranges);
27  ~evrp_range_analyzer (void)
28  {
29    delete vr_values;
30    stack.release ();
31  }
32
33  void enter (basic_block);
34  void push_marker (void);
35  void pop_to_marker (void);
36  void leave (basic_block);
37  void record_ranges_from_stmt (gimple *, bool);
38
39  /* Main interface to retrieve range information.  */
40  value_range *get_value_range (const_tree op)
41    { return vr_values->get_value_range (op); }
42
43  /* Record a new unwindable range.  */
44  void push_value_range (tree var, value_range *vr);
45
46  /* Dump all the current value ranges.  This is primarily
47     a debugging interface.  */
48  void dump_all_value_ranges (FILE *fp)
49    { vr_values->dump_all_value_ranges (fp); }
50
51  /* A bit of a wart.  This should ideally go away.  */
52  void vrp_visit_cond_stmt (gcond *cond, edge *e)
53    { return vr_values->vrp_visit_cond_stmt (cond, e); }
54
55  /* Get the underlying vr_values class instance.  If TRANSFER is
56     true, then we are transferring ownership.  Else we keep ownership.
57
58     This should be converted to a unique_ptr.  */
59  class vr_values *get_vr_values (void) { return vr_values; }
60
61 private:
62  DISABLE_COPY_AND_ASSIGN (evrp_range_analyzer);
63  class vr_values *vr_values;
64
65  value_range *pop_value_range (tree var);
66  value_range *try_find_new_range (tree, tree op, tree_code code, tree limit);
67  void record_ranges_from_incoming_edge (basic_block);
68  void record_ranges_from_phis (basic_block);
69  void set_ssa_range_info (tree, value_range *);
70
71  /* STACK holds the old VR.  */
72  auto_vec<std::pair <tree, value_range*> > stack;
73
74  /* True if we are updating global ranges, false otherwise.  */
75  bool m_update_global_ranges;
76};
77
78#endif /* GCC_GIMPLE_SSA_EVRP_ANALYZE_H */
79