gcc/tree-vrp.h

   1 /* Support routines for Value Range Propagation (VRP).
   2    Copyright (C) 2016-2018 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_TREE_VRP_H
  21 #define GCC_TREE_VRP_H
  22
  23 /* Type of value ranges.  See value_range below for a
  24    description of these types.  */
  25 enum value_range_type { VR_UNDEFINED, VR_RANGE,
  26                         VR_ANTI_RANGE, VR_VARYING, VR_LAST };
  27
  28 /* Range of values that can be associated with an SSA_NAME after VRP
  29    has executed.  */
  30 struct GTY((for_user)) value_range
  31 {
  32   /* Lattice value represented by this range.  */
  33   enum value_range_type type;
  34
  35   /* Minimum and maximum values represented by this range.  These
  36      values should be interpreted as follows:
  37
  38         - If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
  39           be NULL.
  40
  41         - If TYPE == VR_RANGE then MIN holds the minimum value and
  42           MAX holds the maximum value of the range [MIN, MAX].
  43
  44         - If TYPE == ANTI_RANGE the variable is known to NOT
  45           take any values in the range [MIN, MAX].  */
  46   tree min;
  47   tree max;
  48
  49   /* Set of SSA names whose value ranges are equivalent to this one.
  50      This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE.  */
  51   bitmap equiv;
  52
  53   /* Dump value range to stderr.  */
  54   void dump () const;
  55 };
  56
  57 extern void vrp_intersect_ranges (value_range *vr0, const value_range *vr1);
  58 extern void vrp_meet (value_range *vr0, const value_range *vr1);
  59 extern void dump_value_range (FILE *, const value_range *);
  60 extern void extract_range_from_unary_expr (value_range *vr,
  61                                            enum tree_code code,
  62                                            tree type,
  63                                            const value_range *vr0_,
  64                                            tree op0_type);
  65
  66 extern bool vrp_operand_equal_p (const_tree, const_tree);
  67 extern enum value_range_type intersect_range_with_nonzero_bits
  68   (enum value_range_type, wide_int *, wide_int *, const wide_int &, signop);
  69
  70 struct assert_info
  71 {
  72   /* Predicate code for the ASSERT_EXPR.  Must be COMPARISON_CLASS_P.  */
  73   enum tree_code comp_code;
  74
  75   /* Name to register the assert for.  */
  76   tree name;
  77
  78   /* Value being compared against.  */
  79   tree val;
  80
  81   /* Expression to compare.  */
  82   tree expr;
  83 };
  84
  85 extern void register_edge_assert_for (tree, edge, enum tree_code,
  86                                       tree, tree, vec<assert_info> &);
  87 extern bool stmt_interesting_for_vrp (gimple *);
  88 extern void set_value_range_to_varying (value_range *);
  89 extern bool range_includes_zero_p (const value_range *);
  90 extern bool infer_value_range (gimple *, tree, tree_code *, tree *);
  91
  92 extern void set_value_range_to_nonnull (value_range *, tree);
  93 extern void set_value_range (value_range *, enum value_range_type, tree,
  94                              tree, bitmap);
  95 extern void set_and_canonicalize_value_range (value_range *,
  96                                               enum value_range_type,
  97                                               tree, tree, bitmap);
  98 extern bool vrp_bitmap_equal_p (const_bitmap, const_bitmap);
  99 extern tree value_range_constant_singleton (const value_range *);
 100 extern bool symbolic_range_p (const value_range *);
 101 extern int compare_values (tree, tree);
 102 extern int compare_values_warnv (tree, tree, bool *);
 103 extern bool vrp_val_is_min (const_tree);
 104 extern bool vrp_val_is_max (const_tree);
 105 extern void copy_value_range (value_range *, const value_range *);
 106 extern void set_value_range_to_value (value_range *, tree, bitmap);
 107 extern void extract_range_from_binary_expr_1 (value_range *, enum tree_code,
 108                                               tree, const value_range *,
 109                                               const value_range *);
 110 extern tree vrp_val_min (const_tree);
 111 extern tree vrp_val_max (const_tree);
 112 extern void set_value_range_to_null (value_range *, tree);
 113 extern bool range_int_cst_p (const value_range *);
 114 extern int operand_less_p (tree, tree);
 115 extern bool find_case_label_range (gswitch *, tree, tree, size_t *, size_t *);
 116 extern bool find_case_label_index (gswitch *, size_t, tree, size_t *);
 117 extern bool vrp_set_zero_nonzero_bits (const tree, const value_range *,
 118                                        wide_int *, wide_int *);
 119 extern bool overflow_comparison_p (tree_code, tree, tree, bool, tree *);
 120 extern bool range_int_cst_singleton_p (const value_range *);
 121 extern int value_inside_range (tree, tree, tree);
 122 extern tree get_single_symbol (tree, bool *, tree *);
 123 extern void maybe_set_nonzero_bits (edge, tree);
 124 extern value_range_type determine_value_range (tree, wide_int *, wide_int *);
 125
 126 struct switch_update {
 127   gswitch *stmt;
 128   tree vec;
 129 };
 130
 131 extern vec<edge> to_remove_edges;
 132 extern vec<switch_update> to_update_switch_stmts;
 133
 134 #endif /* GCC_TREE_VRP_H */