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/* Header file for the context-aware pointer equivalence tracker.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
Contributed by Aldy Hernandez <aldyh@redhat.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_VALUE_POINTER_EQUIV_H
#define GCC_VALUE_POINTER_EQUIV_H
// Simple context-aware pointer equivalency analyzer that returns what
// a pointer SSA name is equivalent to at a given point during a walk
// of the IL.
//
// Note that global equivalency take priority over conditional
// equivalency. That is, p = &q takes priority over a later p == &t.
//
// This class is meant to be called during a DOM walk.
class pointer_equiv_analyzer
{
public:
pointer_equiv_analyzer (gimple_ranger *r);
~pointer_equiv_analyzer ();
void enter (basic_block);
void leave (basic_block);
void visit_stmt (gimple *stmt);
tree get_equiv (tree ssa);
private:
void visit_edge (edge e);
tree get_equiv_expr (tree_code code, tree expr);
void set_global_equiv (tree ssa, tree pointee);
void set_cond_equiv (tree ssa, tree pointee);
gimple_ranger *m_ranger;
// Global pointer equivalency indexed by SSA_NAME_VERSION.
auto_vec<tree> m_global_points;
// Conditional pointer equivalency.
class ssa_equiv_stack *m_cond_points;
};
inline bool
supported_pointer_equiv_p (tree expr)
{
return TREE_CODE (expr) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (expr));
}
#endif // GCC_VALUE_POINTER_EQUIV_H
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