1/* Header file for PHI node routines 2 Copyright (C) 2013-2015 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16You should have received a copy of the GNU General Public License 17along with GCC; see the file COPYING3. If not see 18<http://www.gnu.org/licenses/>. */ 19 20#ifndef GCC_TREE_PHINODES_H 21#define GCC_TREE_PHINODES_H 22 23extern void phinodes_print_statistics (void); 24extern void release_phi_node (gimple); 25extern void reserve_phi_args_for_new_edge (basic_block); 26extern void add_phi_node_to_bb (gphi *phi, basic_block bb); 27extern gphi *create_phi_node (tree, basic_block); 28extern void add_phi_arg (gphi *, tree, edge, source_location); 29extern void remove_phi_args (edge); 30extern void remove_phi_node (gimple_stmt_iterator *, bool); 31extern void remove_phi_nodes (basic_block); 32extern tree degenerate_phi_result (gphi *); 33extern void set_phi_nodes (basic_block, gimple_seq); 34 35static inline use_operand_p 36gimple_phi_arg_imm_use_ptr (gimple gs, int i) 37{ 38 return &gimple_phi_arg (gs, i)->imm_use; 39} 40 41/* Return the phi argument which contains the specified use. */ 42 43static inline int 44phi_arg_index_from_use (use_operand_p use) 45{ 46 struct phi_arg_d *element, *root; 47 size_t index; 48 gimple phi; 49 50 /* Since the use is the first thing in a PHI argument element, we can 51 calculate its index based on casting it to an argument, and performing 52 pointer arithmetic. */ 53 54 phi = USE_STMT (use); 55 56 element = (struct phi_arg_d *)use; 57 root = gimple_phi_arg (phi, 0); 58 index = element - root; 59 60 /* Make sure the calculation doesn't have any leftover bytes. If it does, 61 then imm_use is likely not the first element in phi_arg_d. */ 62 gcc_checking_assert ((((char *)element - (char *)root) 63 % sizeof (struct phi_arg_d)) == 0 64 && index < gimple_phi_capacity (phi)); 65 66 return index; 67} 68 69#endif /* GCC_TREE_PHINODES_H */ 70