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1 /* Data structures and function declarations for the SSA value propagation
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2 engine.
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131
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3 Copyright (C) 2004-2018 Free Software Foundation, Inc.
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4 Contributed by Diego Novillo <dnovillo@redhat.com>
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation; either version 3, or (at your option)
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11 any later version.
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12
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13 GCC is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #ifndef _TREE_SSA_PROPAGATE_H
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23 #define _TREE_SSA_PROPAGATE_H 1
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24
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25 /* If SIM_P is true, statement S will be simulated again. */
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26
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27 static inline void
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28 prop_set_simulate_again (gimple *s, bool visit_p)
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29 {
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30 gimple_set_visited (s, visit_p);
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31 }
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32
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33 /* Return true if statement T should be simulated again. */
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34
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35 static inline bool
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36 prop_simulate_again_p (gimple *s)
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37 {
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38 return gimple_visited_p (s);
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39 }
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40
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41 /* Lattice values used for propagation purposes. Specific instances
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42 of a propagation engine must return these values from the statement
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43 and PHI visit functions to direct the engine. */
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44 enum ssa_prop_result {
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45 /* The statement produces nothing of interest. No edges will be
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46 added to the work lists. */
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47 SSA_PROP_NOT_INTERESTING,
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48
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49 /* The statement produces an interesting value. The set SSA_NAMEs
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50 returned by SSA_PROP_VISIT_STMT should be added to
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51 INTERESTING_SSA_EDGES. If the statement being visited is a
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52 conditional jump, SSA_PROP_VISIT_STMT should indicate which edge
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53 out of the basic block should be marked executable. */
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54 SSA_PROP_INTERESTING,
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55
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56 /* The statement produces a varying (i.e., useless) value and
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57 should not be simulated again. If the statement being visited
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58 is a conditional jump, all the edges coming out of the block
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59 will be considered executable. */
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60 SSA_PROP_VARYING
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61 };
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62
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63
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64 extern bool valid_gimple_rhs_p (tree);
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65 extern void move_ssa_defining_stmt_for_defs (gimple *, gimple *);
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66 extern bool update_gimple_call (gimple_stmt_iterator *, tree, int, ...);
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67 extern bool update_call_from_tree (gimple_stmt_iterator *, tree);
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68 extern bool stmt_makes_single_store (gimple *);
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69 extern bool may_propagate_copy (tree, tree);
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70 extern bool may_propagate_copy_into_stmt (gimple *, tree);
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71 extern bool may_propagate_copy_into_asm (tree);
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72 extern void propagate_value (use_operand_p, tree);
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73 extern void replace_exp (use_operand_p, tree);
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74 extern void propagate_tree_value (tree *, tree);
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75 extern void propagate_tree_value_into_stmt (gimple_stmt_iterator *, tree);
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131
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76
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77 /* Public interface into the SSA propagation engine. Clients should inherit
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78 from this class and provide their own visitors. */
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79
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80 class ssa_propagation_engine
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81 {
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82 public:
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83
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84 virtual ~ssa_propagation_engine (void) { }
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85
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86 /* Virtual functions the clients must provide to visit statements
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87 and phi nodes respectively. */
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88 virtual enum ssa_prop_result visit_stmt (gimple *, edge *, tree *) = 0;
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89 virtual enum ssa_prop_result visit_phi (gphi *) = 0;
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90
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91 /* Main interface into the propagation engine. */
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92 void ssa_propagate (void);
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93
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94 private:
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95 /* Internal implementation details. */
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96 void simulate_stmt (gimple *stmt);
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97 void simulate_block (basic_block);
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98 };
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99
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100 class substitute_and_fold_engine
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101 {
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102 public:
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103 virtual ~substitute_and_fold_engine (void) { }
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104 virtual bool fold_stmt (gimple_stmt_iterator *) { return false; }
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105 virtual tree get_value (tree) { return NULL_TREE; }
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106
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107 bool substitute_and_fold (void);
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108 bool replace_uses_in (gimple *);
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109 bool replace_phi_args_in (gphi *);
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110 };
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0
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111
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112 #endif /* _TREE_SSA_PROPAGATE_H */
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