108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
/* Support routines for value queries.
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Copyright (C) 2020-2021 Free Software Foundation, Inc.
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Contributed by Aldy Hernandez <aldyh@redhat.com> and
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Andrew Macleod <amacleod@redhat.com>.
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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_QUERY_H
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#define GCC_QUERY_H
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// The value_query class is used by optimization passes that require
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// valueizing SSA names in terms of a tree value, but have no neeed
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// for ranges.
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//
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// value_of_expr must be provided. The default for value_on_edge and
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// value_of_stmt is to call value_of_expr.
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//
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// This implies the valuation is global in nature. If a pass can make
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// use of more specific information, it can override the other queries.
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//
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// Proper usage of the correct query in passes will enable other
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// valuation mechanisms to produce more precise results.
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class value_query
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{
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public:
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value_query () { }
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// Return the singleton expression for NAME at a gimple statement,
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// or NULL if none found.
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virtual tree value_of_expr (tree name, gimple * = NULL) = 0;
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// Return the singleton expression for NAME at an edge, or NULL if
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// none found.
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virtual tree value_on_edge (edge, tree name);
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// Return the singleton expression for the LHS of a gimple
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// statement, assuming an (optional) initial value of NAME. Returns
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// NULL if none found.
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//
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// Note that this method calculates the range the LHS would have
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// *after* the statement has executed.
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virtual tree value_of_stmt (gimple *, tree name = NULL);
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private:
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DISABLE_COPY_AND_ASSIGN (value_query);
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};
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// The range_query class is used by optimization passes which are
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// range aware.
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//
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// range_of_expr must be provided. The default for range_on_edge and
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// range_of_stmt is to call range_of_expr. If a pass can make use of
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// more specific information, then it can override the other queries.
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//
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// The default for the value_* routines is to call the equivalent
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// range_* routines, check if the range is a singleton, and return it
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// if so.
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//
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// The get_value_range method is currently provided for compatibility
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// with vr-values. It will be deprecated when possible.
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class range_query : public value_query
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{
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public:
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range_query ();
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virtual ~range_query ();
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virtual tree value_of_expr (tree name, gimple * = NULL) OVERRIDE;
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virtual tree value_on_edge (edge, tree name) OVERRIDE;
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virtual tree value_of_stmt (gimple *, tree name = NULL) OVERRIDE;
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// These are the range equivalents of the value_* methods. Instead
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// of returning a singleton, they calculate a range and return it in
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// R. TRUE is returned on success or FALSE if no range was found.
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//
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// Note that range_of_expr must always return TRUE unless ranges are
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// unsupported for NAME's type (supports_type_p is false).
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virtual bool range_of_expr (irange &r, tree name, gimple * = NULL) = 0;
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virtual bool range_on_edge (irange &r, edge, tree name);
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virtual bool range_of_stmt (irange &r, gimple *, tree name = NULL);
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// DEPRECATED: This method is used from vr-values. The plan is to
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// rewrite all uses of it to the above API.
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virtual const class value_range_equiv *get_value_range (const_tree,
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gimple * = NULL);
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protected:
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class value_range_equiv *allocate_value_range_equiv ();
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void free_value_range_equiv (class value_range_equiv *);
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private:
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class equiv_allocator *equiv_alloc;
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};
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#endif // GCC_QUERY_H
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