Line data    Source code

       1              : /* Header file for the context-aware pointer equivalence tracker.
       2              :    Copyright (C) 2020-2026 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    241220057 : supported_pointer_equiv_p (tree expr)
      58              : {
      59    241220057 :   return TREE_CODE (expr) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (expr));
      60              : }
      61              : 
      62              : #endif // GCC_VALUE_POINTER_EQUIV_H