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/* Data structures and function declarations for the SSA value propagation engine. Copyright (C) 2004, 2005, 2007, 2008, 2010, 2011 Free Software Foundation, Inc. Contributed by Diego Novillo <dnovillo@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 _TREE_SSA_PROPAGATE_H #define _TREE_SSA_PROPAGATE_H 1 /* If SIM_P is true, statement S will be simulated again. */ static inline void prop_set_simulate_again (gimple s, bool visit_p) { gimple_set_visited (s, visit_p); } /* Return true if statement T should be simulated again. */ static inline bool prop_simulate_again_p (gimple s) { return gimple_visited_p (s); } /* Lattice values used for propagation purposes. Specific instances of a propagation engine must return these values from the statement and PHI visit functions to direct the engine. */ enum ssa_prop_result { /* The statement produces nothing of interest. No edges will be added to the work lists. */ SSA_PROP_NOT_INTERESTING, /* The statement produces an interesting value. The set SSA_NAMEs returned by SSA_PROP_VISIT_STMT should be added to INTERESTING_SSA_EDGES. If the statement being visited is a conditional jump, SSA_PROP_VISIT_STMT should indicate which edge out of the basic block should be marked executable. */ SSA_PROP_INTERESTING, /* The statement produces a varying (i.e., useless) value and should not be simulated again. If the statement being visited is a conditional jump, all the edges coming out of the block will be considered executable. */ SSA_PROP_VARYING }; /* Call-back functions used by the value propagation engine. */ typedef enum ssa_prop_result (*ssa_prop_visit_stmt_fn) (gimple, edge *, tree *); typedef enum ssa_prop_result (*ssa_prop_visit_phi_fn) (gimple); typedef bool (*ssa_prop_fold_stmt_fn) (gimple_stmt_iterator *gsi); typedef tree (*ssa_prop_get_value_fn) (tree); /* In tree-ssa-propagate.c */ void ssa_propagate (ssa_prop_visit_stmt_fn, ssa_prop_visit_phi_fn); bool valid_gimple_rhs_p (tree); void move_ssa_defining_stmt_for_defs (gimple, gimple); bool update_gimple_call (gimple_stmt_iterator *, tree, int, ...); bool update_call_from_tree (gimple_stmt_iterator *, tree); bool stmt_makes_single_store (gimple); bool substitute_and_fold (ssa_prop_get_value_fn, ssa_prop_fold_stmt_fn, bool); #endif /* _TREE_SSA_PROPAGATE_H */
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