gcc/gimple-ssa-evrp-analyze.h

   1 /* Support routines for Value Range Propagation (VRP).
   2    Copyright (C) 2016-2020 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_GIMPLE_SSA_EVRP_ANALYZE_H
  21 #define GCC_GIMPLE_SSA_EVRP_ANALYZE_H
  22
  23 class 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   const value_range_equiv *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_equiv *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   {
  54     simplify_using_ranges simpl (vr_values);
  55     simpl.vrp_visit_cond_stmt (cond, e);
  56   }
  57
  58   /* Get the underlying vr_values class instance.  If TRANSFER is
  59      true, then we are transferring ownership.  Else we keep ownership.
  60
  61      This should be converted to a unique_ptr.  */
  62   class vr_values *get_vr_values (void) { return vr_values; }
  63
  64  private:
  65   DISABLE_COPY_AND_ASSIGN (evrp_range_analyzer);
  66   class vr_values *vr_values;
  67
  68   void pop_value_range ();
  69   value_range_equiv *try_find_new_range (tree, tree op, tree_code code,
  70                                          tree limit);
  71   void record_ranges_from_incoming_edge (basic_block);
  72   void record_ranges_from_phis (basic_block);
  73   void set_ssa_range_info (tree, value_range_equiv *);
  74
  75   /* STACK holds the old VR.  */
  76   auto_vec<std::pair <tree, value_range_equiv *> > stack;
  77
  78   /* True if we are updating global ranges, false otherwise.  */
  79   bool m_update_global_ranges;
  80 };
  81
  82 #endif /* GCC_GIMPLE_SSA_EVRP_ANALYZE_H */