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/* Support routines for value queries.
Copyright (C) 2020 Free Software Foundation, Inc.
Contributed by Aldy Hernandez <aldyh@redhat.com> and
Andrew MacLeod <amacleod@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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "ssa.h"
#include "tree-pretty-print.h"
#include "fold-const.h"
#include "value-range-equiv.h"
#include "value-query.h"
#include "alloc-pool.h"
// value_query default methods.
tree
value_query::value_on_edge (edge, tree name)
{
return value_of_expr (name);
}
tree
value_query::value_of_stmt (gimple *stmt, tree name)
{
if (!name)
name = gimple_get_lhs (stmt);
gcc_checking_assert (!name || name == gimple_get_lhs (stmt));
if (name)
return value_of_expr (name);
return NULL_TREE;
}
// range_query default methods.
bool
range_query::range_on_edge (irange &r, edge, tree name)
{
return range_of_expr (r, name);
}
bool
range_query::range_of_stmt (irange &r, gimple *stmt, tree name)
{
if (!name)
name = gimple_get_lhs (stmt);
gcc_checking_assert (!name || name == gimple_get_lhs (stmt));
if (name)
return range_of_expr (r, name);
return false;
}
tree
range_query::value_of_expr (tree name, gimple *stmt)
{
tree t;
int_range_max r;
if (!irange::supports_type_p (TREE_TYPE (name)))
return NULL_TREE;
if (range_of_expr (r, name, stmt))
{
// A constant used in an unreachable block oftens returns as UNDEFINED.
// If the result is undefined, check the global value for a constant.
if (r.undefined_p ())
range_of_expr (r, name);
if (r.singleton_p (&t))
return t;
}
return NULL_TREE;
}
tree
range_query::value_on_edge (edge e, tree name)
{
tree t;
int_range_max r;
if (!irange::supports_type_p (TREE_TYPE (name)))
return NULL_TREE;
if (range_on_edge (r, e, name))
{
// A constant used in an unreachable block oftens returns as UNDEFINED.
// If the result is undefined, check the global value for a constant.
if (r.undefined_p ())
range_of_expr (r, name);
if (r.singleton_p (&t))
return t;
}
return NULL_TREE;
}
tree
range_query::value_of_stmt (gimple *stmt, tree name)
{
tree t;
int_range_max r;
if (!name)
name = gimple_get_lhs (stmt);
gcc_checking_assert (!name || name == gimple_get_lhs (stmt));
if (!name || !irange::supports_type_p (TREE_TYPE (name)))
return NULL_TREE;
if (range_of_stmt (r, stmt, name) && r.singleton_p (&t))
return t;
return NULL_TREE;
}
// valuation_query support routines for value_range_equiv's.
class equiv_allocator : public object_allocator<value_range_equiv>
{
public:
equiv_allocator ()
: object_allocator<value_range_equiv> ("equiv_allocator pool") { }
};
value_range_equiv *
range_query::allocate_value_range_equiv ()
{
return new (equiv_alloc->allocate ()) value_range_equiv;
}
void
range_query::free_value_range_equiv (value_range_equiv *v)
{
equiv_alloc->remove (v);
}
const class value_range_equiv *
range_query::get_value_range (const_tree expr, gimple *stmt)
{
int_range_max r;
if (range_of_expr (r, const_cast<tree> (expr), stmt))
return new (equiv_alloc->allocate ()) value_range_equiv (r);
return new (equiv_alloc->allocate ()) value_range_equiv (TREE_TYPE (expr));
}
range_query::range_query ()
{
equiv_alloc = new equiv_allocator;
}
range_query::~range_query ()
{
equiv_alloc->release ();
delete equiv_alloc;
}
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