Branch data Line data Source code
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 : 219174444 : supported_pointer_equiv_p (tree expr)
58 : : {
59 : 219174444 : return TREE_CODE (expr) == SSA_NAME && POINTER_TYPE_P (TREE_TYPE (expr));
60 : : }
61 : :
62 : : #endif // GCC_VALUE_POINTER_EQUIV_H
|