gcc/lto-streamer.c

   1 /* Miscellaneous utilities for GIMPLE streaming.  Things that are used
   2    in both input and output are here.
   3
   4    Copyright (C) 2009-2020 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 const char *section_name_prefix = LTO_SECTION_NAME_PREFIX;
  39 /* Set when streaming LTO for offloading compiler.  */
  40 bool lto_stream_offload_p;
  41
  42 FILE *streamer_dump_file;
  43
  44 /* Return a string representing LTO tag TAG.  */
  45
  46 const char *
  47 lto_tag_name (enum LTO_tags tag)
  48 {
  49   if (lto_tag_is_tree_code_p (tag))
  50     {
  51       /* For tags representing tree nodes, return the name of the
  52          associated tree code.  */
  53       return get_tree_code_name (lto_tag_to_tree_code (tag));
  54     }
  55
  56   if (lto_tag_is_gimple_code_p (tag))
  57     {
  58       /* For tags representing gimple statements, return the name of
  59          the associated gimple code.  */
  60       return gimple_code_name[lto_tag_to_gimple_code (tag)];
  61     }
  62
  63   switch (tag)
  64     {
  65     case LTO_null:
  66       return "LTO_null";
  67     case LTO_bb0:
  68       return "LTO_bb0";
  69     case LTO_bb1:
  70       return "LTO_bb1";
  71     case LTO_eh_region:
  72       return "LTO_eh_region";
  73     case LTO_function:
  74       return "LTO_function";
  75     case LTO_eh_table:
  76       return "LTO_eh_table";
  77     case LTO_ert_cleanup:
  78       return "LTO_ert_cleanup";
  79     case LTO_ert_try:
  80       return "LTO_ert_try";
  81     case LTO_ert_allowed_exceptions:
  82       return "LTO_ert_allowed_exceptions";
  83     case LTO_ert_must_not_throw:
  84       return "LTO_ert_must_not_throw";
  85     case LTO_tree_pickle_reference:
  86       return "LTO_tree_pickle_reference";
  87     case LTO_field_decl_ref:
  88       return "LTO_field_decl_ref";
  89     case LTO_function_decl_ref:
  90       return "LTO_function_decl_ref";
  91     case LTO_label_decl_ref:
  92       return "LTO_label_decl_ref";
  93     case LTO_namespace_decl_ref:
  94       return "LTO_namespace_decl_ref";
  95     case LTO_result_decl_ref:
  96       return "LTO_result_decl_ref";
  97     case LTO_ssa_name_ref:
  98       return "LTO_ssa_name_ref";
  99     case LTO_type_decl_ref:
 100       return "LTO_type_decl_ref";
 101     case LTO_type_ref:
 102       return "LTO_type_ref";
 103     case LTO_global_decl_ref:
 104       return "LTO_global_decl_ref";
 105     default:
 106       return "LTO_UNKNOWN";
 107     }
 108 }
 109
 110
 111 /* Get a section name for a particular type or name.  The NAME field
 112    is only used if SECTION_TYPE is LTO_section_function_body. For all
 113    others it is ignored.  The callee of this function is responsible
 114    to free the returned name.  */
 115
 116 char *
 117 lto_get_section_name (int section_type, const char *name,
 118                       int node_order, struct lto_file_decl_data *f)
 119 {
 120   const char *add;
 121   char post[32];
 122   const char *sep;
 123
 124   if (section_type == LTO_section_function_body)
 125     {
 126       gcc_assert (name != NULL);
 127       if (name[0] == '*')
 128         name++;
 129
 130       char *buffer = (char *)xmalloc (strlen (name) + 32);
 131       sprintf (buffer, "%s.%d", name, node_order);
 132
 133       add = buffer;
 134       sep = "";
 135     }
 136   else if (section_type < LTO_N_SECTION_TYPES)
 137     {
 138       add = lto_section_name[section_type];
 139       sep = ".";
 140     }
 141   else
 142     internal_error ("bytecode stream: unexpected LTO section %s", name);
 143
 144   /* Make the section name unique so that ld -r combining sections
 145      doesn't confuse the reader with merged sections.
 146
 147      For options don't add a ID, the option reader cannot deal with them
 148      and merging should be ok here. */
 149   if (section_type == LTO_section_opts)
 150     strcpy (post, "");
 151   else if (f != NULL)
 152     sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
 153   else
 154     sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false));
 155   return concat (section_name_prefix, sep, add, post, NULL);
 156 }
 157
 158
 159 /* Show various memory usage statistics related to LTO.  */
 160
 161 void
 162 print_lto_report (const char *s)
 163 {
 164   unsigned i;
 165
 166   fprintf (stderr, "[%s] # of input files: "
 167            HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);
 168
 169   fprintf (stderr, "[%s] # of input cgraph nodes: "
 170            HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 171            lto_stats.num_input_cgraph_nodes);
 172
 173   fprintf (stderr, "[%s] # of function bodies: "
 174            HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 175            lto_stats.num_function_bodies);
 176
 177   for (i = 0; i < NUM_TREE_CODES; i++)
 178     if (lto_stats.num_trees[i])
 179       fprintf (stderr, "[%s] # of '%s' objects read: "
 180                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 181                get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]);
 182
 183   if (flag_lto)
 184     {
 185       fprintf (stderr, "[%s] Compression: "
 186                HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
 187                HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
 188                lto_stats.num_output_il_bytes,
 189                lto_stats.num_compressed_il_bytes);
 190       if (lto_stats.num_output_il_bytes > 0)
 191         {
 192           const float dividend = (float) lto_stats.num_compressed_il_bytes;
 193           const float divisor = (float) lto_stats.num_output_il_bytes;
 194           fprintf (stderr, " (ratio: %f)", dividend / divisor);
 195         }
 196       fprintf (stderr, "\n");
 197     }
 198
 199   if (flag_wpa)
 200     {
 201       fprintf (stderr, "[%s] # of output files: "
 202                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 203                lto_stats.num_output_files);
 204
 205       fprintf (stderr, "[%s] # of output symtab nodes: "
 206                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 207                lto_stats.num_output_symtab_nodes);
 208
 209       fprintf (stderr, "[%s] # of output tree pickle references: "
 210                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 211                lto_stats.num_pickle_refs_output);
 212       fprintf (stderr, "[%s] # of output tree bodies: "
 213                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 214                lto_stats.num_tree_bodies_output);
 215
 216       fprintf (stderr, "[%s] # callgraph partitions: "
 217                HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
 218                lto_stats.num_cgraph_partitions);
 219
 220       fprintf (stderr, "[%s] Compression: "
 221                HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
 222                HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
 223                lto_stats.num_input_il_bytes,
 224                lto_stats.num_uncompressed_il_bytes);
 225       if (lto_stats.num_input_il_bytes > 0)
 226         {
 227           const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
 228           const float divisor = (float) lto_stats.num_input_il_bytes;
 229           fprintf (stderr, " (ratio: %f)", dividend / divisor);
 230         }
 231       fprintf (stderr, "\n");
 232     }
 233
 234   for (i = 0; i < LTO_N_SECTION_TYPES; i++)
 235     fprintf (stderr, "[%s] Size of mmap'd section %s: "
 236              HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
 237              lto_section_name[i], lto_stats.section_size[i]);
 238 }
 239
 240 /* Initialization common to the LTO reader and writer.  */
 241
 242 void
 243 lto_streamer_init (void)
 244 {
 245   /* Check that all the TS_* handled by the reader and writer routines
 246      match exactly the structures defined in treestruct.def.  When a
 247      new TS_* astructure is added, the streamer should be updated to
 248      handle it.  */
 249   if (flag_checking)
 250     streamer_check_handled_ts_structures ();
 251 }
 252
 253
 254 /* Gate function for all LTO streaming passes.  */
 255
 256 bool
 257 gate_lto_out (void)
 258 {
 259   return ((flag_generate_lto || flag_generate_offload || in_lto_p)
 260           /* Don't bother doing anything if the program has errors.  */
 261           && !seen_error ());
 262 }
 263
 264 /* Check that the version MAJOR.MINOR is the correct version number.  */
 265
 266 void
 267 lto_check_version (int major, int minor, const char *file_name)
 268 {
 269   if (major != LTO_major_version || minor != LTO_minor_version)
 270     fatal_error (input_location,
 271                  "bytecode stream in file %qs generated with LTO version "
 272                  "%d.%d instead of the expected %d.%d",
 273                  file_name,
 274                  major, minor,
 275                  LTO_major_version, LTO_minor_version);
 276 }
 277
 278
 279 /* Initialize all the streamer hooks used for streaming GIMPLE.  */
 280
 281 void
 282 lto_streamer_hooks_init (void)
 283 {
 284   streamer_hooks_init ();
 285   streamer_hooks.write_tree = lto_output_tree;
 286   streamer_hooks.read_tree = lto_input_tree;
 287   streamer_hooks.input_location = lto_input_location;
 288   streamer_hooks.output_location = lto_output_location;
 289 }