1 /* Support routines for Value Range Propagation (VRP).
2 Copyright (C) 2016-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
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)
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.
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/>. */
20 #ifndef GCC_TREE_VRP_H
21 #define GCC_TREE_VRP_H
23 /* Types of value ranges. */
28 /* Range spans the entire domain. */
30 /* Range is [MIN, MAX]. */
32 /* Range is ~[MIN, MAX]. */
34 /* Range is a nice guy. */
39 /* Range of values that can be associated with an SSA_NAME after VRP
41 class GTY((for_user
)) value_range_base
45 value_range_base (value_range_kind
, tree
, tree
);
47 void set (value_range_kind
, tree
, tree
);
49 void set_nonnull (tree
);
52 enum value_range_kind
kind () const;
56 /* Types of value ranges. */
57 bool symbolic_p () const;
58 bool constant_p () const;
59 bool undefined_p () const;
60 bool varying_p () const;
62 void set_undefined ();
64 void union_ (const value_range_base
*);
66 bool ignore_equivs_equal_p (const value_range_base
&) const;
70 bool may_contain_p (tree
) const;
71 void set_and_canonicalize (enum value_range_kind
, tree
, tree
);
73 bool singleton_p (tree
*result
= NULL
) const;
74 void dump (FILE *) const;
78 static value_range_base
union_helper (const value_range_base
*,
79 const value_range_base
*);
81 enum value_range_kind m_kind
;
86 friend void gt_ggc_mx_value_range_base (void *);
87 friend void gt_pch_p_16value_range_base (void *, void *,
88 gt_pointer_operator
, void *);
89 friend void gt_pch_nx_value_range_base (void *);
90 friend void gt_ggc_mx (value_range_base
&);
91 friend void gt_ggc_mx (value_range_base
*&);
92 friend void gt_pch_nx (value_range_base
&);
93 friend void gt_pch_nx (value_range_base
*, gt_pointer_operator
, void *);
96 /* Note value_range cannot currently be used with GC memory, only
97 value_range_base is fully set up for this. */
98 class GTY((user
)) value_range
: public value_range_base
102 value_range (const value_range_base
&);
103 /* Deep-copies equiv bitmap argument. */
104 value_range (value_range_kind
, tree
, tree
, bitmap
= NULL
);
106 /* Shallow-copies equiv bitmap. */
107 value_range (const value_range
&) /* = delete */;
108 /* Shallow-copies equiv bitmap. */
109 value_range
& operator=(const value_range
&) /* = delete */;
111 /* Move equiv bitmap from source range. */
112 void move (value_range
*);
114 /* Leaves equiv bitmap alone. */
115 void update (value_range_kind
, tree
, tree
);
116 /* Deep-copies equiv bitmap argument. */
117 void set (value_range_kind
, tree
, tree
, bitmap
= NULL
);
119 void set_nonnull (tree
);
120 void set_null (tree
);
122 bool operator== (const value_range
&) const;
123 bool operator!= (const value_range
&) const;
124 void intersect (const value_range
*);
125 void union_ (const value_range
*);
127 /* Types of value ranges. */
128 void set_undefined ();
131 /* Equivalence bitmap methods. */
132 bitmap
equiv () const;
134 void equiv_add (const_tree
, const value_range
*, bitmap_obstack
* = NULL
);
137 void deep_copy (const value_range
*);
138 void set_and_canonicalize (enum value_range_kind
, tree
, tree
, bitmap
= NULL
);
139 void dump (FILE *) const;
142 /* Deep-copies bitmap argument. */
143 void set_equiv (bitmap
);
145 bool equal_p (const value_range
&, bool ignore_equivs
) const;
146 void intersect_helper (value_range
*, const value_range
*);
148 /* Set of SSA names whose value ranges are equivalent to this one.
149 This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
154 value_range_base::value_range_base ()
156 m_kind
= VR_UNDEFINED
;
157 m_min
= m_max
= NULL
;
161 value_range::value_range ()
162 : value_range_base ()
167 /* Return the kind of this range. */
169 inline value_range_kind
170 value_range_base::kind () const
176 value_range::equiv () const
181 /* Return the lower bound. */
184 value_range_base::min () const
189 /* Return the upper bound. */
192 value_range_base::max () const
197 /* Return TRUE if range spans the entire possible domain. */
200 value_range_base::varying_p () const
202 return m_kind
== VR_VARYING
;
205 /* Return TRUE if range is undefined (essentially the empty set). */
208 value_range_base::undefined_p () const
210 return m_kind
== VR_UNDEFINED
;
213 /* Return TRUE if range is the constant zero. */
216 value_range_base::zero_p () const
218 return (m_kind
== VR_RANGE
219 && integer_zerop (m_min
)
220 && integer_zerop (m_max
));
223 extern void dump_value_range (FILE *, const value_range
*);
224 extern void dump_value_range (FILE *, const value_range_base
*);
228 /* Predicate code for the ASSERT_EXPR. Must be COMPARISON_CLASS_P. */
229 enum tree_code comp_code
;
231 /* Name to register the assert for. */
234 /* Value being compared against. */
237 /* Expression to compare. */
241 extern void register_edge_assert_for (tree
, edge
, enum tree_code
,
242 tree
, tree
, vec
<assert_info
> &);
243 extern bool stmt_interesting_for_vrp (gimple
*);
244 extern bool range_includes_zero_p (const value_range_base
*);
245 extern bool infer_value_range (gimple
*, tree
, tree_code
*, tree
*);
247 extern bool vrp_bitmap_equal_p (const_bitmap
, const_bitmap
);
249 extern tree
value_range_constant_singleton (const value_range_base
*);
250 extern bool range_int_cst_p (const value_range_base
*);
251 extern bool range_int_cst_singleton_p (const value_range_base
*);
253 extern int compare_values (tree
, tree
);
254 extern int compare_values_warnv (tree
, tree
, bool *);
255 extern int operand_less_p (tree
, tree
);
256 extern bool vrp_val_is_min (const_tree
);
257 extern bool vrp_val_is_max (const_tree
);
258 extern int value_inside_range (tree
, tree
, tree
);
260 extern tree
vrp_val_min (const_tree
);
261 extern tree
vrp_val_max (const_tree
);
263 extern void extract_range_from_unary_expr (value_range_base
*vr
,
266 const value_range_base
*vr0_
,
268 extern void extract_range_from_binary_expr (value_range_base
*,
270 tree
, const value_range_base
*,
271 const value_range_base
*);
273 extern bool vrp_operand_equal_p (const_tree
, const_tree
);
274 extern enum value_range_kind intersect_range_with_nonzero_bits
275 (enum value_range_kind
, wide_int
*, wide_int
*, const wide_int
&, signop
);
276 extern bool vrp_set_zero_nonzero_bits (const tree
, const value_range_base
*,
277 wide_int
*, wide_int
*);
279 extern bool find_case_label_range (gswitch
*, tree
, tree
, size_t *, size_t *);
280 extern bool find_case_label_index (gswitch
*, size_t, tree
, size_t *);
281 extern bool overflow_comparison_p (tree_code
, tree
, tree
, bool, tree
*);
282 extern tree
get_single_symbol (tree
, bool *, tree
*);
283 extern void maybe_set_nonzero_bits (edge
, tree
);
284 extern value_range_kind
determine_value_range (tree
, wide_int
*, wide_int
*);
286 #endif /* GCC_TREE_VRP_H */