151 lines
5.2 KiB
C++
151 lines
5.2 KiB
C++
/* Support routines for value queries.
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Copyright (C) 2020-2023 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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#include "value-relation.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 need
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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 EXPR at a gimple statement,
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// or NULL if none found.
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virtual tree value_of_expr (tree expr, gimple * = NULL) = 0;
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// Return the singleton expression for EXPR at an edge, or NULL if
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// none found.
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virtual tree value_on_edge (edge, tree expr);
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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 expr, gimple * = NULL) override;
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virtual tree value_on_edge (edge, tree expr) 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 EXPR's type (supports_type_p is false).
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virtual bool range_of_expr (vrange &r, tree expr, gimple * = NULL) = 0;
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virtual bool range_on_edge (vrange &r, edge, tree expr);
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virtual bool range_of_stmt (vrange &r, gimple *, tree name = NULL);
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// When the IL in a stmt is changed, call this for better results.
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virtual void update_stmt (gimple *) { }
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// Query if there is any relation between SSA1 and SSA2.
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relation_kind query_relation (gimple *s, tree ssa1, tree ssa2,
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bool get_range = true);
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relation_kind query_relation (edge e, tree ssa1, tree ssa2,
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bool get_range = true);
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// If present, Access relation oracle for more advanced uses.
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inline relation_oracle *oracle () const { return m_oracle; }
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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 value_range *get_value_range (const_tree, gimple * = NULL);
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virtual void dump (FILE *);
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protected:
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bool get_tree_range (vrange &v, tree expr, gimple *stmt);
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bool get_arith_expr_range (vrange &r, tree expr, gimple *stmt);
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relation_oracle *m_oracle;
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private:
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class equiv_allocator *equiv_alloc;
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};
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// Global ranges for SSA names using SSA_NAME_RANGE_INFO.
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class global_range_query : public range_query
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{
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public:
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bool range_of_expr (vrange &r, tree expr, gimple * = NULL) override;
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};
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extern global_range_query global_ranges;
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inline range_query *
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get_global_range_query ()
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{
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return &global_ranges;
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}
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/* Returns the currently active range access class. When there is no active
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range class, global ranges are used. Never returns null. */
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ATTRIBUTE_RETURNS_NONNULL inline range_query *
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get_range_query (const struct function *fun)
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{
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return (fun && fun->x_range_query) ? fun->x_range_query : &global_ranges;
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}
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// Query the global range of NAME in function F. Default to cfun.
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extern void gimple_range_global (vrange &v, tree name,
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struct function *f = cfun);
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#endif // GCC_QUERY_H
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