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750628d8 DN |
1 | /* Data structures and function declarations for the SSA value propagation |
2 | engine. | |
cbe34bb5 | 3 | Copyright (C) 2004-2017 Free Software Foundation, Inc. |
750628d8 DN |
4 | Contributed by Diego Novillo <dnovillo@redhat.com> |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
9dcd6f09 | 10 | the Free Software Foundation; either version 3, or (at your option) |
750628d8 DN |
11 | any later version. |
12 | ||
13 | GCC is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
750628d8 DN |
21 | |
22 | #ifndef _TREE_SSA_PROPAGATE_H | |
23 | #define _TREE_SSA_PROPAGATE_H 1 | |
24 | ||
726a989a RB |
25 | /* If SIM_P is true, statement S will be simulated again. */ |
26 | ||
27 | static inline void | |
355fe088 | 28 | prop_set_simulate_again (gimple *s, bool visit_p) |
726a989a RB |
29 | { |
30 | gimple_set_visited (s, visit_p); | |
31 | } | |
32 | ||
33 | /* Return true if statement T should be simulated again. */ | |
34 | ||
35 | static inline bool | |
355fe088 | 36 | prop_simulate_again_p (gimple *s) |
726a989a RB |
37 | { |
38 | return gimple_visited_p (s); | |
39 | } | |
750628d8 DN |
40 | |
41 | /* Lattice values used for propagation purposes. Specific instances | |
42 | of a propagation engine must return these values from the statement | |
43 | and PHI visit functions to direct the engine. */ | |
750628d8 DN |
44 | enum ssa_prop_result { |
45 | /* The statement produces nothing of interest. No edges will be | |
46 | added to the work lists. */ | |
47 | SSA_PROP_NOT_INTERESTING, | |
48 | ||
49 | /* The statement produces an interesting value. The set SSA_NAMEs | |
50 | returned by SSA_PROP_VISIT_STMT should be added to | |
51 | INTERESTING_SSA_EDGES. If the statement being visited is a | |
52 | conditional jump, SSA_PROP_VISIT_STMT should indicate which edge | |
2a7e31df | 53 | out of the basic block should be marked executable. */ |
750628d8 DN |
54 | SSA_PROP_INTERESTING, |
55 | ||
56 | /* The statement produces a varying (i.e., useless) value and | |
57 | should not be simulated again. If the statement being visited | |
58 | is a conditional jump, all the edges coming out of the block | |
59 | will be considered executable. */ | |
60 | SSA_PROP_VARYING | |
61 | }; | |
62 | ||
63 | ||
64 | /* Call-back functions used by the value propagation engine. */ | |
ff7ffb8f | 65 | typedef bool (*ssa_prop_fold_stmt_fn) (gimple_stmt_iterator *gsi); |
455e6d5b | 66 | typedef tree (*ssa_prop_get_value_fn) (tree); |
750628d8 | 67 | |
0bca51f0 | 68 | |
744730a4 | 69 | extern bool valid_gimple_rhs_p (tree); |
355fe088 | 70 | extern void move_ssa_defining_stmt_for_defs (gimple *, gimple *); |
744730a4 AM |
71 | extern bool update_gimple_call (gimple_stmt_iterator *, tree, int, ...); |
72 | extern bool update_call_from_tree (gimple_stmt_iterator *, tree); | |
355fe088 | 73 | extern bool stmt_makes_single_store (gimple *); |
62869a1c | 74 | extern bool substitute_and_fold (ssa_prop_get_value_fn, ssa_prop_fold_stmt_fn); |
744730a4 | 75 | extern bool may_propagate_copy (tree, tree); |
355fe088 | 76 | extern bool may_propagate_copy_into_stmt (gimple *, tree); |
744730a4 AM |
77 | extern bool may_propagate_copy_into_asm (tree); |
78 | extern void propagate_value (use_operand_p, tree); | |
79 | extern void replace_exp (use_operand_p, tree); | |
80 | extern void propagate_tree_value (tree *, tree); | |
81 | extern void propagate_tree_value_into_stmt (gimple_stmt_iterator *, tree); | |
973625a0 | 82 | extern bool replace_uses_in (gimple *stmt, ssa_prop_get_value_fn get_value); |
750628d8 | 83 | |
d9a3704a JL |
84 | /* Public interface into the SSA propagation engine. Clients should inherit |
85 | from this class and provide their own visitors. */ | |
86 | ||
87 | class ssa_propagation_engine | |
88 | { | |
89 | public: | |
90 | ||
91 | /* Main interface into the propagation engine. */ | |
92 | void ssa_propagate (void); | |
93 | ||
94 | /* Virtual functions the clients must provide to visit statements | |
95 | and phi nodes respectively. */ | |
96 | virtual enum ssa_prop_result visit_stmt (gimple *, edge *, tree *) = 0; | |
97 | virtual enum ssa_prop_result visit_phi (gphi *) = 0; | |
98 | ||
99 | private: | |
100 | /* Internal implementation details. */ | |
101 | void simulate_stmt (gimple *stmt); | |
102 | void process_ssa_edge_worklist (void); | |
103 | void simulate_block (basic_block); | |
104 | ||
105 | }; | |
106 | ||
750628d8 | 107 | #endif /* _TREE_SSA_PROPAGATE_H */ |