gcc/analyzer/ranges.h

   1 /* Symbolic offsets and ranges.
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3    Contributed by David Malcolm <dmalcolm@redhat.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it
   8 under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_ANALYZER_RANGES_H
  22 #define GCC_ANALYZER_RANGES_H
  23
  24 namespace ana {
  25
  26 /* Wrapper around an svalue for a value measured in bytes.  */
  27
  28 class symbolic_byte_offset
  29 {
  30 public:
  31   explicit symbolic_byte_offset (int i, region_model_manager &mgr);
  32   symbolic_byte_offset (const svalue *num_bytes_sval);
  33   explicit symbolic_byte_offset (region_offset offset,
  34                                  region_model_manager &mgr);
  35
  36   const svalue *get_svalue () const { return m_num_bytes_sval; }
  37   tree maybe_get_constant () const;
  38
  39   void dump_to_pp (pretty_printer *pp, bool) const;
  40   void dump (bool) const;
  41
  42   bool operator== (const symbolic_byte_offset &other) const
  43   {
  44    return m_num_bytes_sval == other.m_num_bytes_sval;
  45   }
  46
  47 private:
  48   const svalue *m_num_bytes_sval;
  49 };
  50
  51 /* A range of byte offsets, where both the start and size of the
  52    range can be symbolic.  */
  53
  54 class symbolic_byte_range
  55 {
  56 public:
  57   symbolic_byte_range (symbolic_byte_offset start,
  58                        symbolic_byte_offset size)
  59   : m_start (start),
  60     m_size (size)
  61   {
  62   }
  63
  64   symbolic_byte_range (region_offset start,
  65                        const svalue *num_bytes,
  66                        region_model_manager &mgr);
  67
  68   void dump_to_pp (pretty_printer *pp,
  69                    bool simple,
  70                    region_model_manager &mgr) const;
  71   void dump (bool, region_model_manager &mgr) const;
  72
  73   bool empty_p () const;
  74
  75   symbolic_byte_offset get_start_byte_offset () const
  76   {
  77     return m_start;
  78   }
  79   symbolic_byte_offset get_last_byte_offset (region_model_manager &mgr) const;
  80   symbolic_byte_offset get_size_in_bytes () const
  81   {
  82     return m_size;
  83   }
  84   symbolic_byte_offset get_next_byte_offset (region_model_manager &mgr) const;
  85
  86   tristate intersection (const symbolic_byte_range &other,
  87                          const region_model &model) const;
  88
  89 private:
  90   symbolic_byte_offset m_start;
  91   symbolic_byte_offset m_size;
  92 };
  93
  94 } // namespace ana
  95
  96 #endif /* GCC_ANALYZER_RANGES_H */