Line data Source code
1 : /* Miscellaneous utilities for GIMPLE streaming. Things that are used
2 : in both input and output are here.
3 :
4 : Copyright (C) 2009-2026 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 0 : lto_tag_name (enum LTO_tags tag)
48 : {
49 0 : 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 0 : return get_tree_code_name (lto_tag_to_tree_code (tag));
54 : }
55 :
56 0 : 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 0 : return gimple_code_name[lto_tag_to_gimple_code (tag)];
61 : }
62 :
63 0 : switch (tag)
64 : {
65 : case LTO_null:
66 : return "LTO_null";
67 0 : case LTO_bb0:
68 0 : return "LTO_bb0";
69 0 : case LTO_bb1:
70 0 : return "LTO_bb1";
71 0 : case LTO_eh_region:
72 0 : return "LTO_eh_region";
73 0 : case LTO_function:
74 0 : return "LTO_function";
75 0 : case LTO_eh_table:
76 0 : return "LTO_eh_table";
77 0 : case LTO_ert_cleanup:
78 0 : return "LTO_ert_cleanup";
79 0 : case LTO_ert_try:
80 0 : return "LTO_ert_try";
81 0 : case LTO_ert_allowed_exceptions:
82 0 : return "LTO_ert_allowed_exceptions";
83 0 : case LTO_ert_must_not_throw:
84 0 : return "LTO_ert_must_not_throw";
85 0 : case LTO_tree_pickle_reference:
86 0 : return "LTO_tree_pickle_reference";
87 0 : case LTO_global_stream_ref:
88 0 : return "LTO_global_sream_ref";
89 0 : case LTO_ssa_name_ref:
90 0 : return "LTO_ssa_name_ref";
91 0 : default:
92 0 : return "LTO_UNKNOWN";
93 : }
94 : }
95 :
96 :
97 : /* Get a section name for a particular type or name. The NAME field
98 : is only used if SECTION_TYPE is LTO_section_function_body. For all
99 : others it is ignored. The callee of this function is responsible
100 : to free the returned name. */
101 :
102 : char *
103 926566 : lto_get_section_name (int section_type, const char *name,
104 : int node_order, struct lto_file_decl_data *f)
105 : {
106 926566 : const char *add;
107 926566 : char post[32];
108 926566 : const char *sep;
109 926566 : char *buffer = NULL;
110 :
111 926566 : if (section_type == LTO_section_function_body)
112 : {
113 277624 : gcc_assert (name != NULL);
114 277624 : if (name[0] == '*')
115 8648 : name++;
116 :
117 277624 : buffer = (char *)xmalloc (strlen (name) + 32);
118 277624 : sprintf (buffer, "%s.%d", name, node_order);
119 :
120 277624 : add = buffer;
121 277624 : sep = "";
122 : }
123 648942 : else if (section_type < LTO_N_SECTION_TYPES)
124 : {
125 648942 : add = lto_section_name[section_type];
126 648942 : sep = ".";
127 : }
128 : else
129 0 : internal_error ("bytecode stream: unexpected LTO section %s", name);
130 :
131 : /* Make the section name unique so that ld -r combining sections
132 : doesn't confuse the reader with merged sections.
133 :
134 : For options don't add a ID, the option reader cannot deal with them
135 : and merging should be ok here.
136 :
137 : LTRANS files (output of wpa, input and output of ltrans) are handled
138 : directly inside of linker/lto-wrapper, so name uniqueness for external
139 : tools is not needed.
140 : Randomness would inhibit incremental LTO. */
141 926566 : if (section_type == LTO_section_opts || flag_ltrans)
142 152494 : strcpy (post, "");
143 774072 : else if (f != NULL)
144 268975 : sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
145 505097 : else if (flag_wpa)
146 105006 : strcpy (post, "");
147 : else
148 400091 : sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false));
149 926566 : char *res = concat (section_name_prefix, sep, add, post, NULL);
150 926566 : if (buffer)
151 277624 : free (buffer);
152 926566 : return res;
153 : }
154 :
155 :
156 : /* Show various memory usage statistics related to LTO. */
157 :
158 : void
159 0 : print_lto_report (const char *s)
160 : {
161 0 : unsigned i;
162 :
163 0 : fprintf (stderr, "[%s] # of input files: "
164 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);
165 :
166 0 : fprintf (stderr, "[%s] # of input cgraph nodes: "
167 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
168 : lto_stats.num_input_cgraph_nodes);
169 :
170 0 : fprintf (stderr, "[%s] # of function bodies: "
171 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
172 : lto_stats.num_function_bodies);
173 :
174 0 : for (i = 0; i < NUM_TREE_CODES; i++)
175 0 : if (lto_stats.num_trees[i])
176 0 : fprintf (stderr, "[%s] # of '%s' objects read: "
177 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
178 : get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]);
179 :
180 0 : if (flag_lto)
181 : {
182 0 : fprintf (stderr, "[%s] Compression: "
183 : HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
184 : HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
185 : lto_stats.num_output_il_bytes,
186 : lto_stats.num_compressed_il_bytes);
187 0 : if (lto_stats.num_output_il_bytes > 0)
188 : {
189 0 : const float dividend = (float) lto_stats.num_compressed_il_bytes;
190 0 : const float divisor = (float) lto_stats.num_output_il_bytes;
191 0 : fprintf (stderr, " (ratio: %f)", dividend / divisor);
192 : }
193 0 : fprintf (stderr, "\n");
194 : }
195 :
196 0 : if (flag_wpa)
197 : {
198 0 : fprintf (stderr, "[%s] # of output files: "
199 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
200 : lto_stats.num_output_files);
201 :
202 0 : fprintf (stderr, "[%s] # of output symtab nodes: "
203 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
204 : lto_stats.num_output_symtab_nodes);
205 :
206 0 : fprintf (stderr, "[%s] # of output tree pickle references: "
207 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
208 : lto_stats.num_pickle_refs_output);
209 0 : fprintf (stderr, "[%s] # of output tree bodies: "
210 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
211 : lto_stats.num_tree_bodies_output);
212 :
213 0 : fprintf (stderr, "[%s] # callgraph partitions: "
214 : HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
215 : lto_stats.num_cgraph_partitions);
216 :
217 0 : fprintf (stderr, "[%s] Compression: "
218 : HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
219 : HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
220 : lto_stats.num_input_il_bytes,
221 : lto_stats.num_uncompressed_il_bytes);
222 0 : if (lto_stats.num_input_il_bytes > 0)
223 : {
224 0 : const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
225 0 : const float divisor = (float) lto_stats.num_input_il_bytes;
226 0 : fprintf (stderr, " (ratio: %f)", dividend / divisor);
227 : }
228 0 : fprintf (stderr, "\n");
229 : }
230 :
231 0 : for (i = 0; i < LTO_N_SECTION_TYPES; i++)
232 0 : fprintf (stderr, "[%s] Size of mmap'd section %s: "
233 : HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
234 : lto_section_name[i], lto_stats.section_size[i]);
235 0 : }
236 :
237 : /* Initialization common to the LTO reader and writer. */
238 :
239 : void
240 51618 : lto_streamer_init (void)
241 : {
242 : /* Check that all the TS_* handled by the reader and writer routines
243 : match exactly the structures defined in treestruct.def. When a
244 : new TS_* astructure is added, the streamer should be updated to
245 : handle it. */
246 51618 : if (flag_checking)
247 51612 : streamer_check_handled_ts_structures ();
248 51618 : }
249 :
250 :
251 : /* Gate function for all LTO streaming passes. */
252 :
253 : bool
254 0 : gate_lto_out (void)
255 : {
256 0 : return ((flag_generate_lto || flag_generate_offload || in_lto_p)
257 : /* Don't bother doing anything if the program has errors. */
258 0 : && !seen_error ());
259 : }
260 :
261 : /* Check that the version MAJOR.MINOR is the correct version number. */
262 :
263 : void
264 21447 : lto_check_version (int major, int minor, const char *file_name)
265 : {
266 21447 : if (major != LTO_major_version || minor != LTO_minor_version)
267 0 : fatal_error (input_location,
268 : "bytecode stream in file %qs generated with LTO version "
269 : "%d.%d instead of the expected %d.%d",
270 : file_name,
271 : major, minor,
272 : LTO_major_version, LTO_minor_version);
273 21447 : }
274 :
275 :
276 : /* Initialize all the streamer hooks used for streaming GIMPLE. */
277 :
278 : void
279 43440 : lto_streamer_hooks_init (void)
280 : {
281 43440 : streamer_hooks_init ();
282 43440 : streamer_hooks.write_tree = lto_output_tree;
283 43440 : streamer_hooks.read_tree = lto_input_tree;
284 43440 : streamer_hooks.input_location = lto_input_location;
285 43440 : streamer_hooks.output_location = lto_output_location;
286 43440 : streamer_hooks.output_location_and_block = lto_output_location_and_block;
287 43440 : }
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