297 lines
8.0 KiB
C++
297 lines
8.0 KiB
C++
/* Support routines for Value Range Propagation (VRP).
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Copyright (C) 2016-2019 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TREE_VRP_H
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#define GCC_TREE_VRP_H
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/* Types of value ranges. */
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enum value_range_kind
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{
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/* Empty range. */
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VR_UNDEFINED,
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/* Range spans the entire domain. */
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VR_VARYING,
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/* Range is [MIN, MAX]. */
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VR_RANGE,
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/* Range is ~[MIN, MAX]. */
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VR_ANTI_RANGE,
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/* Range is a nice guy. */
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VR_LAST
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};
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/* Range of values that can be associated with an SSA_NAME after VRP
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has executed. */
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class GTY((for_user)) value_range_base
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{
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public:
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value_range_base ();
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value_range_base (value_range_kind, tree, tree);
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void set (value_range_kind, tree, tree);
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void set (tree);
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void set_nonnull (tree);
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void set_null (tree);
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enum value_range_kind kind () const;
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tree min () const;
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tree max () const;
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/* Types of value ranges. */
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bool symbolic_p () const;
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bool constant_p () const;
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bool undefined_p () const;
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bool varying_p () const;
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void set_varying ();
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void set_undefined ();
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void union_ (const value_range_base *);
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bool operator== (const value_range_base &) const /* = delete */;
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bool operator!= (const value_range_base &) const /* = delete */;
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bool equal_p (const value_range_base &) const;
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/* Misc methods. */
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tree type () const;
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bool may_contain_p (tree) const;
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void set_and_canonicalize (enum value_range_kind, tree, tree);
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bool zero_p () const;
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bool singleton_p (tree *result = NULL) const;
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void dump (FILE *) const;
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protected:
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void check ();
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static value_range_base union_helper (const value_range_base *,
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const value_range_base *);
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enum value_range_kind m_kind;
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tree m_min;
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tree m_max;
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friend void gt_ggc_mx_value_range_base (void *);
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friend void gt_pch_p_16value_range_base (void *, void *,
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gt_pointer_operator, void *);
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friend void gt_pch_nx_value_range_base (void *);
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friend void gt_ggc_mx (value_range_base &);
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friend void gt_ggc_mx (value_range_base *&);
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friend void gt_pch_nx (value_range_base &);
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friend void gt_pch_nx (value_range_base *, gt_pointer_operator, void *);
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};
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/* Note value_range cannot currently be used with GC memory, only
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value_range_base is fully set up for this. */
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class GTY((user)) value_range : public value_range_base
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{
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public:
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value_range ();
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value_range (const value_range_base &);
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/* Deep-copies equiv bitmap argument. */
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value_range (value_range_kind, tree, tree, bitmap = NULL);
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/* Shallow-copies equiv bitmap. */
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value_range (const value_range &) /* = delete */;
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/* Shallow-copies equiv bitmap. */
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value_range& operator=(const value_range&) /* = delete */;
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/* Move equiv bitmap from source range. */
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void move (value_range *);
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/* Leaves equiv bitmap alone. */
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void update (value_range_kind, tree, tree);
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/* Deep-copies equiv bitmap argument. */
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void set (value_range_kind, tree, tree, bitmap = NULL);
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void set (tree);
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void set_nonnull (tree);
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void set_null (tree);
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bool operator== (const value_range &) const /* = delete */;
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bool operator!= (const value_range &) const /* = delete */;
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void intersect (const value_range *);
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void union_ (const value_range *);
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bool equal_p (const value_range &, bool ignore_equivs) const;
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/* Types of value ranges. */
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void set_undefined ();
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void set_varying ();
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/* Equivalence bitmap methods. */
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bitmap equiv () const;
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void equiv_clear ();
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void equiv_add (const_tree, const value_range *, bitmap_obstack * = NULL);
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/* Misc methods. */
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void deep_copy (const value_range *);
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void set_and_canonicalize (enum value_range_kind, tree, tree, bitmap = NULL);
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void dump (FILE *) const;
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private:
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/* Deep-copies bitmap argument. */
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void set_equiv (bitmap);
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void check ();
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void intersect_helper (value_range *, const value_range *);
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/* Set of SSA names whose value ranges are equivalent to this one.
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This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
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bitmap m_equiv;
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};
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inline
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value_range_base::value_range_base ()
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{
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m_kind = VR_UNDEFINED;
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m_min = m_max = NULL;
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}
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inline
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value_range::value_range ()
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: value_range_base ()
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{
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m_equiv = NULL;
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}
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/* Return the kind of this range. */
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inline value_range_kind
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value_range_base::kind () const
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{
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return m_kind;
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}
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inline bitmap
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value_range::equiv () const
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{
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return m_equiv;
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}
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/* Return the lower bound. */
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inline tree
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value_range_base::min () const
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{
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return m_min;
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}
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/* Return the upper bound. */
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inline tree
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value_range_base::max () const
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{
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return m_max;
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}
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/* Return TRUE if range spans the entire possible domain. */
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inline bool
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value_range_base::varying_p () const
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{
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return m_kind == VR_VARYING;
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}
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/* Return TRUE if range is undefined (essentially the empty set). */
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inline bool
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value_range_base::undefined_p () const
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{
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return m_kind == VR_UNDEFINED;
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}
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/* Return TRUE if range is the constant zero. */
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inline bool
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value_range_base::zero_p () const
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{
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return (m_kind == VR_RANGE
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&& integer_zerop (m_min)
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&& integer_zerop (m_max));
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}
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extern void dump_value_range (FILE *, const value_range *);
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extern void dump_value_range (FILE *, const value_range_base *);
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struct assert_info
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{
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/* Predicate code for the ASSERT_EXPR. Must be COMPARISON_CLASS_P. */
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enum tree_code comp_code;
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/* Name to register the assert for. */
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tree name;
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/* Value being compared against. */
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tree val;
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/* Expression to compare. */
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tree expr;
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};
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extern void register_edge_assert_for (tree, edge, enum tree_code,
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tree, tree, vec<assert_info> &);
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extern bool stmt_interesting_for_vrp (gimple *);
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extern bool range_includes_p (const value_range_base *, HOST_WIDE_INT);
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extern bool infer_value_range (gimple *, tree, tree_code *, tree *);
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extern bool vrp_bitmap_equal_p (const_bitmap, const_bitmap);
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extern tree value_range_constant_singleton (const value_range_base *);
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extern bool range_int_cst_p (const value_range_base *);
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extern bool range_int_cst_singleton_p (const value_range_base *);
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extern int compare_values (tree, tree);
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extern int compare_values_warnv (tree, tree, bool *);
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extern int operand_less_p (tree, tree);
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extern bool vrp_val_is_min (const_tree);
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extern bool vrp_val_is_max (const_tree);
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extern int value_inside_range (tree, tree, tree);
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extern tree vrp_val_min (const_tree);
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extern tree vrp_val_max (const_tree);
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extern void extract_range_from_unary_expr (value_range_base *vr,
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enum tree_code code,
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tree type,
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const value_range_base *vr0_,
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tree op0_type);
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extern void extract_range_from_binary_expr (value_range_base *,
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enum tree_code,
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tree, const value_range_base *,
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const value_range_base *);
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extern bool vrp_operand_equal_p (const_tree, const_tree);
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extern enum value_range_kind intersect_range_with_nonzero_bits
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(enum value_range_kind, wide_int *, wide_int *, const wide_int &, signop);
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extern bool vrp_set_zero_nonzero_bits (const tree, const value_range_base *,
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wide_int *, wide_int *);
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extern bool find_case_label_range (gswitch *, tree, tree, size_t *, size_t *);
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extern bool find_case_label_index (gswitch *, size_t, tree, size_t *);
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extern bool overflow_comparison_p (tree_code, tree, tree, bool, tree *);
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extern tree get_single_symbol (tree, bool *, tree *);
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extern void maybe_set_nonzero_bits (edge, tree);
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extern value_range_kind determine_value_range (tree, wide_int *, wide_int *);
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/* Return TRUE if *VR includes the value zero. */
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inline bool
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range_includes_zero_p (const value_range_base *vr)
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{
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return range_includes_p (vr, 0);
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}
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#endif /* GCC_TREE_VRP_H */
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