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/* Header file for PHI node routines
Copyright (C) 2013-2020 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_PHINODES_H
#define GCC_TREE_PHINODES_H
extern void phinodes_print_statistics (void);
extern void reserve_phi_args_for_new_edge (basic_block);
extern void add_phi_node_to_bb (gphi *phi, basic_block bb);
extern gphi *create_phi_node (tree, basic_block);
extern void add_phi_arg (gphi *, tree, edge, location_t);
extern void remove_phi_args (edge);
extern void remove_phi_node (gimple_stmt_iterator *, bool);
extern void remove_phi_nodes (basic_block);
extern tree degenerate_phi_result (gphi *);
extern void set_phi_nodes (basic_block, gimple_seq);
static inline use_operand_p
gimple_phi_arg_imm_use_ptr (gimple *gs, int i)
{
return &gimple_phi_arg (gs, i)->imm_use;
}
/* Return the phi argument which contains the specified use. */
static inline int
phi_arg_index_from_use (use_operand_p use)
{
struct phi_arg_d *element, *root;
size_t index;
gimple *phi;
/* Since the use is the first thing in a PHI argument element, we can
calculate its index based on casting it to an argument, and performing
pointer arithmetic. */
phi = USE_STMT (use);
element = (struct phi_arg_d *)use;
root = gimple_phi_arg (phi, 0);
index = element - root;
/* Make sure the calculation doesn't have any leftover bytes. If it does,
then imm_use is likely not the first element in phi_arg_d. */
gcc_checking_assert ((((char *)element - (char *)root)
% sizeof (struct phi_arg_d)) == 0
&& index < gimple_phi_capacity (phi));
return index;
}
#endif /* GCC_TREE_PHINODES_H */
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