1 /* Routines for emitting GIMPLE to a file stream. 2 3 Copyright (C) 2011-2018 Free Software Foundation, Inc. 4 Contributed by Diego Novillo <dnovillo@google.com> 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #include "config.h" 23 #include "system.h" 24 #include "coretypes.h" 25 #include "backend.h" 26 #include "tree.h" 27 #include "gimple.h" 28 #include "gimple-ssa.h" 29 #include "gimple-streamer.h" 30 #include "tree-eh.h" 31 #include "gimple-iterator.h" 32 #include "cgraph.h" 33 #include "value-prof.h" 34 35 /* Output PHI function PHI to the main stream in OB. */ 36 37 static void 38 output_phi (struct output_block *ob, gphi *phi) 39 { 40 unsigned i, len = gimple_phi_num_args (phi); 41 42 streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI)); 43 streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi))); 44 45 for (i = 0; i < len; i++) 46 { 47 stream_write_tree (ob, gimple_phi_arg_def (phi, i), true); 48 streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index); 49 bitpack_d bp = bitpack_create (ob->main_stream); 50 stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i)); 51 streamer_write_bitpack (&bp); 52 } 53 } 54 55 56 /* Emit statement STMT on the main stream of output block OB. */ 57 58 static void 59 output_gimple_stmt (struct output_block *ob, gimple *stmt) 60 { 61 unsigned i; 62 enum gimple_code code; 63 enum LTO_tags tag; 64 struct bitpack_d bp; 65 histogram_value hist; 66 67 /* Emit identifying tag. */ 68 code = gimple_code (stmt); 69 tag = lto_gimple_code_to_tag (code); 70 streamer_write_record_start (ob, tag); 71 72 /* Emit the tuple header. */ 73 bp = bitpack_create (ob->main_stream); 74 bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt)); 75 bp_pack_value (&bp, gimple_no_warning_p (stmt), 1); 76 if (is_gimple_assign (stmt)) 77 bp_pack_value (&bp, 78 gimple_assign_nontemporal_move_p ( 79 as_a <gassign *> (stmt)), 80 1); 81 bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1); 82 hist = gimple_histogram_value (cfun, stmt); 83 bp_pack_value (&bp, hist != NULL, 1); 84 bp_pack_var_len_unsigned (&bp, stmt->subcode); 85 86 /* Emit location information for the statement. */ 87 stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt))); 88 streamer_write_bitpack (&bp); 89 90 /* Emit the lexical block holding STMT. */ 91 stream_write_tree (ob, gimple_block (stmt), true); 92 93 /* Emit the operands. */ 94 switch (gimple_code (stmt)) 95 { 96 case GIMPLE_RESX: 97 streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt))); 98 break; 99 100 case GIMPLE_EH_MUST_NOT_THROW: 101 stream_write_tree (ob, 102 gimple_eh_must_not_throw_fndecl ( 103 as_a <geh_mnt *> (stmt)), 104 true); 105 break; 106 107 case GIMPLE_EH_DISPATCH: 108 streamer_write_hwi (ob, 109 gimple_eh_dispatch_region ( 110 as_a <geh_dispatch *> (stmt))); 111 break; 112 113 case GIMPLE_ASM: 114 { 115 gasm *asm_stmt = as_a <gasm *> (stmt); 116 streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt)); 117 streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt)); 118 streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt)); 119 streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt)); 120 streamer_write_string (ob, ob->main_stream, 121 gimple_asm_string (asm_stmt), true); 122 } 123 /* Fallthru */ 124 125 case GIMPLE_ASSIGN: 126 case GIMPLE_CALL: 127 case GIMPLE_RETURN: 128 case GIMPLE_SWITCH: 129 case GIMPLE_LABEL: 130 case GIMPLE_COND: 131 case GIMPLE_GOTO: 132 case GIMPLE_DEBUG: 133 for (i = 0; i < gimple_num_ops (stmt); i++) 134 { 135 tree op = gimple_op (stmt, i); 136 tree *basep = NULL; 137 /* Wrap all uses of non-automatic variables inside MEM_REFs 138 so that we do not have to deal with type mismatches on 139 merged symbols during IL read in. The first operand 140 of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */ 141 if (op && (i || !is_gimple_debug (stmt))) 142 { 143 basep = &op; 144 if (TREE_CODE (*basep) == ADDR_EXPR) 145 basep = &TREE_OPERAND (*basep, 0); 146 while (handled_component_p (*basep)) 147 basep = &TREE_OPERAND (*basep, 0); 148 if (VAR_P (*basep) 149 && !auto_var_in_fn_p (*basep, current_function_decl) 150 && !DECL_REGISTER (*basep)) 151 { 152 bool volatilep = TREE_THIS_VOLATILE (*basep); 153 tree ptrtype = build_pointer_type (TREE_TYPE (*basep)); 154 *basep = build2 (MEM_REF, TREE_TYPE (*basep), 155 build1 (ADDR_EXPR, ptrtype, *basep), 156 build_int_cst (ptrtype, 0)); 157 TREE_THIS_VOLATILE (*basep) = volatilep; 158 } 159 else 160 basep = NULL; 161 } 162 stream_write_tree (ob, op, true); 163 /* Restore the original base if we wrapped it inside a MEM_REF. */ 164 if (basep) 165 *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0); 166 } 167 if (is_gimple_call (stmt)) 168 { 169 if (gimple_call_internal_p (stmt)) 170 streamer_write_enum (ob->main_stream, internal_fn, 171 IFN_LAST, gimple_call_internal_fn (stmt)); 172 else 173 stream_write_tree (ob, gimple_call_fntype (stmt), true); 174 } 175 break; 176 177 case GIMPLE_NOP: 178 case GIMPLE_PREDICT: 179 break; 180 181 case GIMPLE_TRANSACTION: 182 { 183 gtransaction *txn = as_a <gtransaction *> (stmt); 184 gcc_assert (gimple_transaction_body (txn) == NULL); 185 stream_write_tree (ob, gimple_transaction_label_norm (txn), true); 186 stream_write_tree (ob, gimple_transaction_label_uninst (txn), true); 187 stream_write_tree (ob, gimple_transaction_label_over (txn), true); 188 } 189 break; 190 191 default: 192 gcc_unreachable (); 193 } 194 if (hist) 195 stream_out_histogram_value (ob, hist); 196 } 197 198 199 /* Output a basic block BB to the main stream in OB for this FN. */ 200 201 void 202 output_bb (struct output_block *ob, basic_block bb, struct function *fn) 203 { 204 gimple_stmt_iterator bsi = gsi_start_bb (bb); 205 206 streamer_write_record_start (ob, 207 (!gsi_end_p (bsi)) || phi_nodes (bb) 208 ? LTO_bb1 209 : LTO_bb0); 210 211 streamer_write_uhwi (ob, bb->index); 212 bb->count.stream_out (ob); 213 streamer_write_hwi (ob, bb->flags); 214 215 if (!gsi_end_p (bsi) || phi_nodes (bb)) 216 { 217 /* Output the statements. The list of statements is terminated 218 with a zero. */ 219 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) 220 { 221 int region; 222 gimple *stmt = gsi_stmt (bsi); 223 224 output_gimple_stmt (ob, stmt); 225 226 /* Emit the EH region holding STMT. */ 227 region = lookup_stmt_eh_lp_fn (fn, stmt); 228 if (region != 0) 229 { 230 streamer_write_record_start (ob, LTO_eh_region); 231 streamer_write_hwi (ob, region); 232 } 233 else 234 streamer_write_record_start (ob, LTO_null); 235 } 236 237 streamer_write_record_start (ob, LTO_null); 238 239 for (gphi_iterator psi = gsi_start_phis (bb); 240 !gsi_end_p (psi); 241 gsi_next (&psi)) 242 { 243 gphi *phi = psi.phi (); 244 245 /* Only emit PHIs for gimple registers. PHI nodes for .MEM 246 will be filled in on reading when the SSA form is 247 updated. */ 248 if (!virtual_operand_p (gimple_phi_result (phi))) 249 output_phi (ob, phi); 250 } 251 252 streamer_write_record_start (ob, LTO_null); 253 } 254 } 255