1 /* Header file for PHI node routines 2 Copyright (C) 2013-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along 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 23 extern void phinodes_print_statistics (void); 24 extern void reserve_phi_args_for_new_edge (basic_block); 25 extern void add_phi_node_to_bb (gphi *phi, basic_block bb); 26 extern gphi *create_phi_node (tree, basic_block); 27 extern void add_phi_arg (gphi *, tree, edge, source_location); 28 extern void remove_phi_args (edge); 29 extern void remove_phi_node (gimple_stmt_iterator *, bool); 30 extern void remove_phi_nodes (basic_block); 31 extern tree degenerate_phi_result (gphi *); 32 extern void set_phi_nodes (basic_block, gimple_seq); 33 34 static inline use_operand_p 35 gimple_phi_arg_imm_use_ptr (gimple *gs, int i) 36 { 37 return &gimple_phi_arg (gs, i)->imm_use; 38 } 39 40 /* Return the phi argument which contains the specified use. */ 41 42 static inline int 43 phi_arg_index_from_use (use_operand_p use) 44 { 45 struct phi_arg_d *element, *root; 46 size_t index; 47 gimple *phi; 48 49 /* Since the use is the first thing in a PHI argument element, we can 50 calculate its index based on casting it to an argument, and performing 51 pointer arithmetic. */ 52 53 phi = USE_STMT (use); 54 55 element = (struct phi_arg_d *)use; 56 root = gimple_phi_arg (phi, 0); 57 index = element - root; 58 59 /* Make sure the calculation doesn't have any leftover bytes. If it does, 60 then imm_use is likely not the first element in phi_arg_d. */ 61 gcc_checking_assert ((((char *)element - (char *)root) 62 % sizeof (struct phi_arg_d)) == 0 63 && index < gimple_phi_capacity (phi)); 64 65 return index; 66 } 67 68 #endif /* GCC_TREE_PHINODES_H */ 69