1 /* Support routines for value ranges with equivalences.
2 Copyright (C) 2020-2021 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
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License 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_VALUE_RANGE_EQUIV_H
21 #define GCC_VALUE_RANGE_EQUIV_H
22
23 #include "value-range.h"
24
25 /* Note value_range_equiv cannot currently be used with GC memory,
26 only value_range is fully set up for this. */
class(user)27 class GTY((user)) value_range_equiv : public value_range
28 {
29 public:
30 value_range_equiv () : value_range () { m_equiv = NULL; }
31 value_range_equiv (const value_range &);
32 /* Deep-copies equiv bitmap argument. */
33 value_range_equiv (tree, tree, bitmap = NULL, value_range_kind = VR_RANGE);
34
35 /* Shallow-copies equiv bitmap. */
36 value_range_equiv (const value_range_equiv &) /* = delete */;
37 /* Shallow-copies equiv bitmap. */
38 value_range_equiv& operator=(const value_range_equiv &) /* = delete */;
39
40 /* Move equiv bitmap from source range. */
41 void move (value_range_equiv *);
42
43 /* Leaves equiv bitmap alone. */
44 void update (tree, tree, value_range_kind = VR_RANGE);
45 /* Deep-copies equiv bitmap argument. */
46 void set (tree, tree, bitmap = NULL, value_range_kind = VR_RANGE);
47 void set (tree);
48
49 bool operator== (const value_range_equiv &) const /* = delete */;
50 bool operator!= (const value_range_equiv &) const /* = delete */;
51 void intersect (const value_range_equiv *);
52 void union_ (const value_range_equiv *);
53 bool equal_p (const value_range_equiv &, bool ignore_equivs) const;
54
55 /* Types of value ranges. */
56 void set_undefined ();
57 void set_varying (tree);
58
59 /* Equivalence bitmap methods. */
60 bitmap equiv () const { return m_equiv; }
61 void equiv_clear ();
62 void equiv_add (const_tree, const value_range_equiv *,
63 bitmap_obstack * = NULL);
64
65 /* Misc methods. */
66 void deep_copy (const value_range_equiv *);
67 void dump (FILE *) const;
68 void dump () const;
69
70 private:
71 /* Deep-copies bitmap argument. */
72 void set_equiv (bitmap);
73 void check ();
74
75 /* Set of SSA names whose value ranges are equivalent to this one.
76 This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
77 bitmap m_equiv;
78 };
79
80 extern void dump_value_range (FILE *, const value_range_equiv *);
81
82 #endif // GCC_VALUE_RANGE_EQUIV_H
83