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       1                 :             : /* Header file for the context-aware pointer equivalence tracker.
       2                 :             :    Copyright (C) 2020-2024 Free Software Foundation, Inc.
       3                 :             :    Contributed by Aldy Hernandez <aldyh@redhat.com>
       4                 :             : 
       5                 :             : This file is part of GCC.
       6                 :             : 
       7                 :             : GCC is free software; you can redistribute it and/or modify it under
       8                 :             : the terms of the GNU General Public License as published by the Free
       9                 :             : Software Foundation; either version 3, or (at your option) any later
      10                 :             : version.
      11                 :             : 
      12                 :             : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      13                 :             : WARRANTY; without even the implied warranty of MERCHANTABILITY or
      14                 :             : FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      15                 :             :  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_VALUE_POINTER_EQUIV_H
      22                 :             : #define GCC_VALUE_POINTER_EQUIV_H
      23                 :             : 
      24                 :             : // Simple context-aware pointer equivalency analyzer that returns what
      25                 :             : // a pointer SSA name is equivalent to at a given point during a walk
      26                 :             : // of the IL.
      27                 :             : //
      28                 :             : // Note that global equivalency take priority over conditional
      29                 :             : // equivalency.  That is, p = &q takes priority over a later p == &t.
      30                 :             : //
      31                 :             : // This class is meant to be called during a DOM walk.
      32                 :             : 
      33                 :             : class pointer_equiv_analyzer
      34                 :             : {
      35                 :             : public:
      36                 :             :   pointer_equiv_analyzer (gimple_ranger *r);
      37                 :             :   ~pointer_equiv_analyzer ();
      38                 :             :   void enter (basic_block);
      39                 :             :   void leave (basic_block);
      40                 :             :   void visit_stmt (gimple *stmt);
      41                 :             :   tree get_equiv (tree ssa);
      42                 :             : 
      43                 :             : private:
      44                 :             :   void visit_edge (edge e);
      45                 :             :   tree get_equiv_expr (tree_code code, tree expr);
      46                 :             :   void set_global_equiv (tree ssa, tree pointee);
      47                 :             :   void set_cond_equiv (tree ssa, tree pointee);
      48                 :             : 
      49                 :             :   gimple_ranger *m_ranger;
      50                 :             :   // Global pointer equivalency indexed by SSA_NAME_VERSION.
      51                 :             :   auto_vec<tree> m_global_points;
      52                 :             :   // Conditional pointer equivalency.
      53                 :             :   class ssa_equiv_stack *m_cond_points;
      54                 :             : };
      55                 :             : 
      56                 :             : inline bool
      57                 :   223603132 : supported_pointer_equiv_p (tree expr)
      58                 :             : {
      59                 :   223603132 :   return TREE_CODE (expr) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (expr));
      60                 :             : }
      61                 :             : 
      62                 :             : #endif // GCC_VALUE_POINTER_EQUIV_H