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/* Header file for SSA dominator optimizations.
Copyright (C) 2013-2015 Free Software Foundation, Inc.
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/>. */
#ifndef GCC_TREE_SSA_SCOPED_TABLES_H
#define GCC_TREE_SSA_SCOPED_TABLES_H
/* This class defines an unwindable const/copy equivalence table
layered on top of SSA_NAME_VALUE/set_ssa_name_value.
Essentially it's just a stack of name,prev value pairs with a
special marker (NULL) to indicate unwind points. */
class const_and_copies
{
public:
const_and_copies (void) { m_stack.create (20); };
~const_and_copies (void) { m_stack.release (); }
/* Push the unwinding marker onto the stack. */
void push_marker (void) { m_stack.safe_push (NULL_TREE); }
/* Restore the const/copies table to its state when the last marker
was pushed. */
void pop_to_marker (void);
/* Record a single const/copy pair that can be unwound. */
void record_const_or_copy (tree, tree);
/* Special entry point when we want to provide an explicit previous
value for the first argument. Try to get rid of this in the future. */
void record_const_or_copy (tree, tree, tree);
/* When threading we need to invalidate certain equivalences after
following a loop backedge. The entries we need to invalidate will
always be in this unwindable stack. This entry point handles
finding and invalidating those entries. */
void invalidate (tree);
private:
vec<tree> m_stack;
};
#endif /* GCC_TREE_SSA_SCOPED_TABLES_H */
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