63 lines
2 KiB
C++
63 lines
2 KiB
C++
/* Header file for the context-aware pointer equivalence tracker.
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Copyright (C) 2020-2023 Free Software Foundation, Inc.
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Contributed by Aldy Hernandez <aldyh@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_VALUE_POINTER_EQUIV_H
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#define GCC_VALUE_POINTER_EQUIV_H
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// Simple context-aware pointer equivalency analyzer that returns what
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// a pointer SSA name is equivalent to at a given point during a walk
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// of the IL.
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//
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// Note that global equivalency take priority over conditional
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// equivalency. That is, p = &q takes priority over a later p == &t.
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//
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// This class is meant to be called during a DOM walk.
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class pointer_equiv_analyzer
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{
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public:
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pointer_equiv_analyzer (gimple_ranger *r);
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~pointer_equiv_analyzer ();
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void enter (basic_block);
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void leave (basic_block);
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void visit_stmt (gimple *stmt);
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tree get_equiv (tree ssa);
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private:
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void visit_edge (edge e);
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tree get_equiv_expr (tree_code code, tree expr);
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void set_global_equiv (tree ssa, tree pointee);
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void set_cond_equiv (tree ssa, tree pointee);
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gimple_ranger *m_ranger;
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// Global pointer equivalency indexed by SSA_NAME_VERSION.
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auto_vec<tree> m_global_points;
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// Conditional pointer equivalency.
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class ssa_equiv_stack *m_cond_points;
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};
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inline bool
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supported_pointer_equiv_p (tree expr)
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{
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return TREE_CODE (expr) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (expr));
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}
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#endif // GCC_VALUE_POINTER_EQUIV_H
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