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+/* Data structures and function declarations for the SSA value propagation
+ engine.
+ Copyright (C) 2004, 2005 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 2, 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 COPYING. If not, write to
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
+
+#ifndef _TREE_SSA_PROPAGATE_H
+#define _TREE_SSA_PROPAGATE_H 1
+
+/* Use the TREE_VISITED bitflag to mark statements and PHI nodes that
+ have been deemed varying and should not be simulated again. */
+#define DONT_SIMULATE_AGAIN(T) TREE_VISITED (T)
+
+/* 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
+};
+
+
+struct prop_value_d {
+ /* Lattice value. Each propagator is free to define its own
+ lattice and this field is only meaningful while propagating.
+ It will not be used by substitute_and_fold. */
+ unsigned lattice_val;
+
+ /* Propagated value. */
+ tree value;
+
+ /* If this value is held in an SSA name for a non-register
+ variable, this field holds the actual memory reference
+ associated with this value. This field is taken from
+ the LHS of the assignment that generated the associated SSA
+ name. However, in the case of PHI nodes, this field is copied
+ from the PHI arguments (assuming that all the arguments have
+ the same memory reference). See replace_vuses_in for a more
+ detailed description. */
+ tree mem_ref;
+};
+
+typedef struct prop_value_d prop_value_t;
+
+
+/* Type of value ranges. See value_range_d for a description of these
+ types. */
+enum value_range_type { VR_UNDEFINED, VR_RANGE, VR_ANTI_RANGE, VR_VARYING };
+
+/* Range of values that can be associated with an SSA_NAME after VRP
+ has executed. */
+struct value_range_d
+{
+ /* Lattice value represented by this range. */
+ enum value_range_type type;
+
+ /* Minimum and maximum values represented by this range. These
+ values should be interpreted as follows:
+
+ - If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
+ be NULL.
+
+ - If TYPE == VR_RANGE then MIN holds the minimum value and
+ MAX holds the maximum value of the range [MIN, MAX].
+
+ - If TYPE == ANTI_RANGE the variable is known to NOT
+ take any values in the range [MIN, MAX]. */
+ tree min;
+ tree max;
+
+ /* Set of SSA names whose value ranges are equivalent to this one.
+ This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
+ bitmap equiv;
+};
+
+typedef struct value_range_d value_range_t;
+
+
+/* Call-back functions used by the value propagation engine. */
+typedef enum ssa_prop_result (*ssa_prop_visit_stmt_fn) (tree, edge *, tree *);
+typedef enum ssa_prop_result (*ssa_prop_visit_phi_fn) (tree);
+
+
+/* In tree-ssa-propagate.c */
+void ssa_propagate (ssa_prop_visit_stmt_fn, ssa_prop_visit_phi_fn);
+tree get_rhs (tree);
+bool set_rhs (tree *, tree);
+tree first_vdef (tree);
+bool stmt_makes_single_load (tree);
+bool stmt_makes_single_store (tree);
+prop_value_t *get_value_loaded_by (tree, prop_value_t *);
+bool replace_uses_in (tree, bool *, prop_value_t *);
+void substitute_and_fold (prop_value_t *, bool);
+
+#endif /* _TREE_SSA_PROPAGATE_H */