1 /* Miscellaneous utilities for GIMPLE streaming. Things that are used 2 in both input and output are here. 3 4 Copyright (C) 2009-2018 Free Software Foundation, Inc. 5 Contributed by Doug Kwan <dougkwan@google.com> 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it under 10 the terms of the GNU General Public License as published by the Free 11 Software Foundation; either version 3, or (at your option) any later 12 version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 15 WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GCC; see the file COPYING3. If not see 21 <http://www.gnu.org/licenses/>. */ 22 23 #include "config.h" 24 #include "system.h" 25 #include "coretypes.h" 26 #include "backend.h" 27 #include "tree.h" 28 #include "gimple.h" 29 #include "tree-streamer.h" 30 #include "cgraph.h" 31 #include "lto-streamer.h" 32 #include "toplev.h" 33 #include "lto-section-names.h" 34 35 /* Statistics gathered during LTO, WPA and LTRANS. */ 36 struct lto_stats_d lto_stats; 37 38 /* LTO uses bitmaps with different life-times. So use a separate 39 obstack for all LTO bitmaps. */ 40 static bitmap_obstack lto_obstack; 41 static bool lto_obstack_initialized; 42 43 const char *section_name_prefix = LTO_SECTION_NAME_PREFIX; 44 /* Set when streaming LTO for offloading compiler. */ 45 bool lto_stream_offload_p; 46 47 /* Return a string representing LTO tag TAG. */ 48 49 const char * 50 lto_tag_name (enum LTO_tags tag) 51 { 52 if (lto_tag_is_tree_code_p (tag)) 53 { 54 /* For tags representing tree nodes, return the name of the 55 associated tree code. */ 56 return get_tree_code_name (lto_tag_to_tree_code (tag)); 57 } 58 59 if (lto_tag_is_gimple_code_p (tag)) 60 { 61 /* For tags representing gimple statements, return the name of 62 the associated gimple code. */ 63 return gimple_code_name[lto_tag_to_gimple_code (tag)]; 64 } 65 66 switch (tag) 67 { 68 case LTO_null: 69 return "LTO_null"; 70 case LTO_bb0: 71 return "LTO_bb0"; 72 case LTO_bb1: 73 return "LTO_bb1"; 74 case LTO_eh_region: 75 return "LTO_eh_region"; 76 case LTO_function: 77 return "LTO_function"; 78 case LTO_eh_table: 79 return "LTO_eh_table"; 80 case LTO_ert_cleanup: 81 return "LTO_ert_cleanup"; 82 case LTO_ert_try: 83 return "LTO_ert_try"; 84 case LTO_ert_allowed_exceptions: 85 return "LTO_ert_allowed_exceptions"; 86 case LTO_ert_must_not_throw: 87 return "LTO_ert_must_not_throw"; 88 case LTO_tree_pickle_reference: 89 return "LTO_tree_pickle_reference"; 90 case LTO_field_decl_ref: 91 return "LTO_field_decl_ref"; 92 case LTO_function_decl_ref: 93 return "LTO_function_decl_ref"; 94 case LTO_label_decl_ref: 95 return "LTO_label_decl_ref"; 96 case LTO_namespace_decl_ref: 97 return "LTO_namespace_decl_ref"; 98 case LTO_result_decl_ref: 99 return "LTO_result_decl_ref"; 100 case LTO_ssa_name_ref: 101 return "LTO_ssa_name_ref"; 102 case LTO_type_decl_ref: 103 return "LTO_type_decl_ref"; 104 case LTO_type_ref: 105 return "LTO_type_ref"; 106 case LTO_global_decl_ref: 107 return "LTO_global_decl_ref"; 108 default: 109 return "LTO_UNKNOWN"; 110 } 111 } 112 113 114 /* Allocate a bitmap from heap. Initializes the LTO obstack if necessary. */ 115 116 bitmap 117 lto_bitmap_alloc (void) 118 { 119 if (!lto_obstack_initialized) 120 { 121 bitmap_obstack_initialize (<o_obstack); 122 lto_obstack_initialized = true; 123 } 124 return BITMAP_ALLOC (<o_obstack); 125 } 126 127 /* Free bitmap B. */ 128 129 void 130 lto_bitmap_free (bitmap b) 131 { 132 BITMAP_FREE (b); 133 } 134 135 136 /* Get a section name for a particular type or name. The NAME field 137 is only used if SECTION_TYPE is LTO_section_function_body. For all 138 others it is ignored. The callee of this function is responsible 139 to free the returned name. */ 140 141 char * 142 lto_get_section_name (int section_type, const char *name, struct lto_file_decl_data *f) 143 { 144 const char *add; 145 char post[32]; 146 const char *sep; 147 148 if (section_type == LTO_section_function_body) 149 { 150 gcc_assert (name != NULL); 151 if (name[0] == '*') 152 name++; 153 add = name; 154 sep = ""; 155 } 156 else if (section_type < LTO_N_SECTION_TYPES) 157 { 158 add = lto_section_name[section_type]; 159 sep = "."; 160 } 161 else 162 internal_error ("bytecode stream: unexpected LTO section %s", name); 163 164 /* Make the section name unique so that ld -r combining sections 165 doesn't confuse the reader with merged sections. 166 167 For options don't add a ID, the option reader cannot deal with them 168 and merging should be ok here. */ 169 if (section_type == LTO_section_opts) 170 strcpy (post, ""); 171 else if (f != NULL) 172 sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id); 173 else 174 sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false)); 175 return concat (section_name_prefix, sep, add, post, NULL); 176 } 177 178 179 /* Show various memory usage statistics related to LTO. */ 180 181 void 182 print_lto_report (const char *s) 183 { 184 unsigned i; 185 186 fprintf (stderr, "[%s] # of input files: " 187 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files); 188 189 fprintf (stderr, "[%s] # of input cgraph nodes: " 190 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 191 lto_stats.num_input_cgraph_nodes); 192 193 fprintf (stderr, "[%s] # of function bodies: " 194 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 195 lto_stats.num_function_bodies); 196 197 for (i = 0; i < NUM_TREE_CODES; i++) 198 if (lto_stats.num_trees[i]) 199 fprintf (stderr, "[%s] # of '%s' objects read: " 200 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 201 get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]); 202 203 if (flag_lto) 204 { 205 fprintf (stderr, "[%s] Compression: " 206 HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, " 207 HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s, 208 lto_stats.num_output_il_bytes, 209 lto_stats.num_compressed_il_bytes); 210 if (lto_stats.num_output_il_bytes > 0) 211 { 212 const float dividend = (float) lto_stats.num_compressed_il_bytes; 213 const float divisor = (float) lto_stats.num_output_il_bytes; 214 fprintf (stderr, " (ratio: %f)", dividend / divisor); 215 } 216 fprintf (stderr, "\n"); 217 } 218 219 if (flag_wpa) 220 { 221 fprintf (stderr, "[%s] # of output files: " 222 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 223 lto_stats.num_output_files); 224 225 fprintf (stderr, "[%s] # of output symtab nodes: " 226 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 227 lto_stats.num_output_symtab_nodes); 228 229 fprintf (stderr, "[%s] # of output tree pickle references: " 230 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 231 lto_stats.num_pickle_refs_output); 232 fprintf (stderr, "[%s] # of output tree bodies: " 233 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 234 lto_stats.num_tree_bodies_output); 235 236 fprintf (stderr, "[%s] # callgraph partitions: " 237 HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, 238 lto_stats.num_cgraph_partitions); 239 240 fprintf (stderr, "[%s] Compression: " 241 HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, " 242 HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s, 243 lto_stats.num_input_il_bytes, 244 lto_stats.num_uncompressed_il_bytes); 245 if (lto_stats.num_input_il_bytes > 0) 246 { 247 const float dividend = (float) lto_stats.num_uncompressed_il_bytes; 248 const float divisor = (float) lto_stats.num_input_il_bytes; 249 fprintf (stderr, " (ratio: %f)", dividend / divisor); 250 } 251 fprintf (stderr, "\n"); 252 } 253 254 for (i = 0; i < LTO_N_SECTION_TYPES; i++) 255 fprintf (stderr, "[%s] Size of mmap'd section %s: " 256 HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s, 257 lto_section_name[i], lto_stats.section_size[i]); 258 } 259 260 /* Initialization common to the LTO reader and writer. */ 261 262 void 263 lto_streamer_init (void) 264 { 265 /* Check that all the TS_* handled by the reader and writer routines 266 match exactly the structures defined in treestruct.def. When a 267 new TS_* astructure is added, the streamer should be updated to 268 handle it. */ 269 if (flag_checking) 270 streamer_check_handled_ts_structures (); 271 } 272 273 274 /* Gate function for all LTO streaming passes. */ 275 276 bool 277 gate_lto_out (void) 278 { 279 return ((flag_generate_lto || flag_generate_offload || in_lto_p) 280 /* Don't bother doing anything if the program has errors. */ 281 && !seen_error ()); 282 } 283 284 /* Check that the version MAJOR.MINOR is the correct version number. */ 285 286 void 287 lto_check_version (int major, int minor, const char *file_name) 288 { 289 if (major != LTO_major_version || minor != LTO_minor_version) 290 fatal_error (input_location, 291 "bytecode stream in file %qs generated with LTO version " 292 "%d.%d instead of the expected %d.%d", 293 file_name, 294 major, minor, 295 LTO_major_version, LTO_minor_version); 296 } 297 298 299 /* Initialize all the streamer hooks used for streaming GIMPLE. */ 300 301 void 302 lto_streamer_hooks_init (void) 303 { 304 streamer_hooks_init (); 305 streamer_hooks.write_tree = lto_output_tree; 306 streamer_hooks.read_tree = lto_input_tree; 307 streamer_hooks.input_location = lto_input_location; 308 streamer_hooks.output_location = lto_output_location; 309 } 310