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d7f09764 DN |
1 | /* Miscellaneous utilities for GIMPLE streaming. Things that are used |
2 | in both input and output are here. | |
3 | ||
5624e564 | 4 | Copyright (C) 2009-2015 Free Software Foundation, Inc. |
d7f09764 DN |
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" | |
c7131fb2 AM |
26 | #include "backend.h" |
27 | #include "tree.h" | |
28 | #include "gimple.h" | |
29 | #include "hard-reg-set.h" | |
d7f09764 DN |
30 | #include "toplev.h" |
31 | #include "flags.h" | |
40e23961 | 32 | #include "alias.h" |
40e23961 | 33 | #include "fold-const.h" |
2fb9a547 | 34 | #include "internal-fn.h" |
442b4905 | 35 | #include "diagnostic-core.h" |
c582198b | 36 | #include "cgraph.h" |
f0efc7aa | 37 | #include "tree-streamer.h" |
d7f09764 | 38 | #include "lto-streamer.h" |
4000360e | 39 | #include "lto-section-names.h" |
d7f09764 DN |
40 | |
41 | /* Statistics gathered during LTO, WPA and LTRANS. */ | |
42 | struct lto_stats_d lto_stats; | |
43 | ||
073a8998 | 44 | /* LTO uses bitmaps with different life-times. So use a separate |
d7f09764 DN |
45 | obstack for all LTO bitmaps. */ |
46 | static bitmap_obstack lto_obstack; | |
47 | static bool lto_obstack_initialized; | |
48 | ||
1f6be682 | 49 | const char *section_name_prefix = LTO_SECTION_NAME_PREFIX; |
1b34e6e2 BS |
50 | /* Set when streaming LTO for offloading compiler. */ |
51 | bool lto_stream_offload_p; | |
d7f09764 DN |
52 | |
53 | /* Return a string representing LTO tag TAG. */ | |
54 | ||
55 | const char * | |
56 | lto_tag_name (enum LTO_tags tag) | |
57 | { | |
58 | if (lto_tag_is_tree_code_p (tag)) | |
59 | { | |
60 | /* For tags representing tree nodes, return the name of the | |
61 | associated tree code. */ | |
5806f481 | 62 | return get_tree_code_name (lto_tag_to_tree_code (tag)); |
d7f09764 DN |
63 | } |
64 | ||
65 | if (lto_tag_is_gimple_code_p (tag)) | |
66 | { | |
67 | /* For tags representing gimple statements, return the name of | |
68 | the associated gimple code. */ | |
69 | return gimple_code_name[lto_tag_to_gimple_code (tag)]; | |
70 | } | |
71 | ||
72 | switch (tag) | |
73 | { | |
74 | case LTO_null: | |
75 | return "LTO_null"; | |
76 | case LTO_bb0: | |
77 | return "LTO_bb0"; | |
78 | case LTO_bb1: | |
79 | return "LTO_bb1"; | |
80 | case LTO_eh_region: | |
81 | return "LTO_eh_region"; | |
82 | case LTO_function: | |
83 | return "LTO_function"; | |
84 | case LTO_eh_table: | |
85 | return "LTO_eh_table"; | |
86 | case LTO_ert_cleanup: | |
87 | return "LTO_ert_cleanup"; | |
88 | case LTO_ert_try: | |
89 | return "LTO_ert_try"; | |
90 | case LTO_ert_allowed_exceptions: | |
91 | return "LTO_ert_allowed_exceptions"; | |
92 | case LTO_ert_must_not_throw: | |
93 | return "LTO_ert_must_not_throw"; | |
94 | case LTO_tree_pickle_reference: | |
95 | return "LTO_tree_pickle_reference"; | |
96 | case LTO_field_decl_ref: | |
97 | return "LTO_field_decl_ref"; | |
98 | case LTO_function_decl_ref: | |
99 | return "LTO_function_decl_ref"; | |
100 | case LTO_label_decl_ref: | |
101 | return "LTO_label_decl_ref"; | |
102 | case LTO_namespace_decl_ref: | |
103 | return "LTO_namespace_decl_ref"; | |
104 | case LTO_result_decl_ref: | |
105 | return "LTO_result_decl_ref"; | |
106 | case LTO_ssa_name_ref: | |
107 | return "LTO_ssa_name_ref"; | |
108 | case LTO_type_decl_ref: | |
109 | return "LTO_type_decl_ref"; | |
110 | case LTO_type_ref: | |
111 | return "LTO_type_ref"; | |
112 | case LTO_global_decl_ref: | |
113 | return "LTO_global_decl_ref"; | |
114 | default: | |
115 | return "LTO_UNKNOWN"; | |
116 | } | |
117 | } | |
118 | ||
119 | ||
120 | /* Allocate a bitmap from heap. Initializes the LTO obstack if necessary. */ | |
121 | ||
122 | bitmap | |
123 | lto_bitmap_alloc (void) | |
124 | { | |
125 | if (!lto_obstack_initialized) | |
126 | { | |
127 | bitmap_obstack_initialize (<o_obstack); | |
128 | lto_obstack_initialized = true; | |
129 | } | |
130 | return BITMAP_ALLOC (<o_obstack); | |
131 | } | |
132 | ||
133 | /* Free bitmap B. */ | |
134 | ||
135 | void | |
136 | lto_bitmap_free (bitmap b) | |
137 | { | |
138 | BITMAP_FREE (b); | |
139 | } | |
140 | ||
141 | ||
142 | /* Get a section name for a particular type or name. The NAME field | |
73ce4d1e AK |
143 | is only used if SECTION_TYPE is LTO_section_function_body. For all |
144 | others it is ignored. The callee of this function is responsible | |
145 | to free the returned name. */ | |
d7f09764 DN |
146 | |
147 | char * | |
73ce4d1e | 148 | lto_get_section_name (int section_type, const char *name, struct lto_file_decl_data *f) |
d7f09764 | 149 | { |
73ce4d1e AK |
150 | const char *add; |
151 | char post[32]; | |
152 | const char *sep; | |
153 | ||
154 | if (section_type == LTO_section_function_body) | |
d7f09764 | 155 | { |
91539475 L |
156 | gcc_assert (name != NULL); |
157 | if (name[0] == '*') | |
158 | name++; | |
73ce4d1e AK |
159 | add = name; |
160 | sep = ""; | |
161 | } | |
162 | else if (section_type < LTO_N_SECTION_TYPES) | |
163 | { | |
164 | add = lto_section_name[section_type]; | |
165 | sep = "."; | |
166 | } | |
167 | else | |
168 | internal_error ("bytecode stream: unexpected LTO section %s", name); | |
d7f09764 | 169 | |
73ce4d1e AK |
170 | /* Make the section name unique so that ld -r combining sections |
171 | doesn't confuse the reader with merged sections. | |
d7f09764 | 172 | |
73ce4d1e | 173 | For options don't add a ID, the option reader cannot deal with them |
dde8b360 | 174 | and merging should be ok here. */ |
73ce4d1e AK |
175 | if (section_type == LTO_section_opts) |
176 | strcpy (post, ""); | |
dde8b360 AK |
177 | else if (f != NULL) |
178 | sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id); | |
73ce4d1e | 179 | else |
dde8b360 | 180 | sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false)); |
1f6be682 | 181 | return concat (section_name_prefix, sep, add, post, NULL); |
d7f09764 DN |
182 | } |
183 | ||
184 | ||
185 | /* Show various memory usage statistics related to LTO. */ | |
186 | ||
187 | void | |
b8f4e58f | 188 | print_lto_report (const char *s) |
d7f09764 | 189 | { |
d7f09764 DN |
190 | unsigned i; |
191 | ||
d7f09764 DN |
192 | fprintf (stderr, "[%s] # of input files: " |
193 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files); | |
194 | ||
b8698a0f | 195 | fprintf (stderr, "[%s] # of input cgraph nodes: " |
d7f09764 DN |
196 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, |
197 | lto_stats.num_input_cgraph_nodes); | |
198 | ||
199 | fprintf (stderr, "[%s] # of function bodies: " | |
200 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
201 | lto_stats.num_function_bodies); | |
202 | ||
d7f09764 DN |
203 | for (i = 0; i < NUM_TREE_CODES; i++) |
204 | if (lto_stats.num_trees[i]) | |
205 | fprintf (stderr, "[%s] # of '%s' objects read: " | |
206 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
5806f481 | 207 | get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]); |
d7f09764 DN |
208 | |
209 | if (flag_lto) | |
210 | { | |
211 | fprintf (stderr, "[%s] Compression: " | |
212 | HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, " | |
213 | HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s, | |
214 | lto_stats.num_output_il_bytes, | |
215 | lto_stats.num_compressed_il_bytes); | |
216 | if (lto_stats.num_output_il_bytes > 0) | |
217 | { | |
218 | const float dividend = (float) lto_stats.num_compressed_il_bytes; | |
219 | const float divisor = (float) lto_stats.num_output_il_bytes; | |
220 | fprintf (stderr, " (ratio: %f)", dividend / divisor); | |
221 | } | |
222 | fprintf (stderr, "\n"); | |
223 | } | |
224 | ||
225 | if (flag_wpa) | |
226 | { | |
227 | fprintf (stderr, "[%s] # of output files: " | |
228 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
229 | lto_stats.num_output_files); | |
230 | ||
7b99cca4 | 231 | fprintf (stderr, "[%s] # of output symtab nodes: " |
d7f09764 | 232 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, |
7b99cca4 | 233 | lto_stats.num_output_symtab_nodes); |
d7f09764 | 234 | |
ee03e71d RB |
235 | fprintf (stderr, "[%s] # of output tree pickle references: " |
236 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
237 | lto_stats.num_pickle_refs_output); | |
238 | fprintf (stderr, "[%s] # of output tree bodies: " | |
239 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
240 | lto_stats.num_tree_bodies_output); | |
241 | ||
d7f09764 DN |
242 | fprintf (stderr, "[%s] # callgraph partitions: " |
243 | HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, | |
244 | lto_stats.num_cgraph_partitions); | |
245 | ||
246 | fprintf (stderr, "[%s] Compression: " | |
247 | HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, " | |
248 | HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s, | |
249 | lto_stats.num_input_il_bytes, | |
250 | lto_stats.num_uncompressed_il_bytes); | |
251 | if (lto_stats.num_input_il_bytes > 0) | |
252 | { | |
253 | const float dividend = (float) lto_stats.num_uncompressed_il_bytes; | |
254 | const float divisor = (float) lto_stats.num_input_il_bytes; | |
255 | fprintf (stderr, " (ratio: %f)", dividend / divisor); | |
256 | } | |
257 | fprintf (stderr, "\n"); | |
258 | } | |
259 | ||
260 | for (i = 0; i < LTO_N_SECTION_TYPES; i++) | |
261 | fprintf (stderr, "[%s] Size of mmap'd section %s: " | |
262 | HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s, | |
263 | lto_section_name[i], lto_stats.section_size[i]); | |
264 | } | |
265 | ||
d7f09764 | 266 | |
331c7fcd | 267 | #ifdef LTO_STREAMER_DEBUG |
331c7fcd EB |
268 | struct tree_hash_entry |
269 | { | |
270 | tree key; | |
271 | intptr_t value; | |
272 | }; | |
273 | ||
8d67ee55 | 274 | struct tree_entry_hasher : nofree_ptr_hash <tree_hash_entry> |
4a8fb1a1 | 275 | { |
4a8fb1a1 LC |
276 | static inline hashval_t hash (const value_type *); |
277 | static inline bool equal (const value_type *, const compare_type *); | |
278 | }; | |
279 | ||
280 | inline hashval_t | |
281 | tree_entry_hasher::hash (const value_type *e) | |
331c7fcd | 282 | { |
331c7fcd EB |
283 | return htab_hash_pointer (e->key); |
284 | } | |
285 | ||
4a8fb1a1 LC |
286 | inline bool |
287 | tree_entry_hasher::equal (const value_type *e1, const compare_type *e2) | |
331c7fcd | 288 | { |
331c7fcd EB |
289 | return (e1->key == e2->key); |
290 | } | |
4a8fb1a1 | 291 | |
c203e8a7 | 292 | static hash_table<tree_hash_entry> *tree_htab; |
331c7fcd EB |
293 | #endif |
294 | ||
d7f09764 DN |
295 | /* Initialization common to the LTO reader and writer. */ |
296 | ||
297 | void | |
298 | lto_streamer_init (void) | |
299 | { | |
0c28944f | 300 | #ifdef ENABLE_CHECKING |
d7f09764 DN |
301 | /* Check that all the TS_* handled by the reader and writer routines |
302 | match exactly the structures defined in treestruct.def. When a | |
303 | new TS_* astructure is added, the streamer should be updated to | |
304 | handle it. */ | |
412288f1 | 305 | streamer_check_handled_ts_structures (); |
0c28944f | 306 | #endif |
331c7fcd EB |
307 | |
308 | #ifdef LTO_STREAMER_DEBUG | |
c203e8a7 | 309 | tree_htab = new hash_table<tree_hash_entry> (31); |
331c7fcd | 310 | #endif |
d7f09764 DN |
311 | } |
312 | ||
313 | ||
314 | /* Gate function for all LTO streaming passes. */ | |
315 | ||
316 | bool | |
317 | gate_lto_out (void) | |
318 | { | |
f0d78df9 | 319 | return ((flag_generate_lto || flag_generate_offload || in_lto_p) |
d7f09764 | 320 | /* Don't bother doing anything if the program has errors. */ |
1da2ed5f | 321 | && !seen_error ()); |
d7f09764 DN |
322 | } |
323 | ||
324 | ||
325 | #ifdef LTO_STREAMER_DEBUG | |
326 | /* Add a mapping between T and ORIG_T, which is the numeric value of | |
327 | the original address of T as it was seen by the LTO writer. This | |
328 | mapping is useful when debugging streaming problems. A debugging | |
329 | session can be started on both reader and writer using ORIG_T | |
330 | as a breakpoint value in both sessions. | |
331 | ||
b8698a0f | 332 | Note that this mapping is transient and only valid while T is |
d7f09764 DN |
333 | being reconstructed. Once T is fully built, the mapping is |
334 | removed. */ | |
335 | ||
336 | void | |
337 | lto_orig_address_map (tree t, intptr_t orig_t) | |
338 | { | |
331c7fcd EB |
339 | struct tree_hash_entry ent; |
340 | struct tree_hash_entry **slot; | |
341 | ||
342 | ent.key = t; | |
343 | ent.value = orig_t; | |
c203e8a7 | 344 | slot = tree_htab->find_slot (&ent, INSERT); |
331c7fcd EB |
345 | gcc_assert (!*slot); |
346 | *slot = XNEW (struct tree_hash_entry); | |
347 | **slot = ent; | |
d7f09764 DN |
348 | } |
349 | ||
350 | ||
351 | /* Get the original address of T as it was seen by the writer. This | |
352 | is only valid while T is being reconstructed. */ | |
353 | ||
354 | intptr_t | |
355 | lto_orig_address_get (tree t) | |
356 | { | |
331c7fcd EB |
357 | struct tree_hash_entry ent; |
358 | struct tree_hash_entry **slot; | |
359 | ||
360 | ent.key = t; | |
c203e8a7 | 361 | slot = tree_htab->find_slot (&ent, NO_INSERT); |
331c7fcd | 362 | return (slot ? (*slot)->value : 0); |
d7f09764 DN |
363 | } |
364 | ||
365 | ||
366 | /* Clear the mapping of T to its original address. */ | |
367 | ||
368 | void | |
369 | lto_orig_address_remove (tree t) | |
370 | { | |
331c7fcd EB |
371 | struct tree_hash_entry ent; |
372 | struct tree_hash_entry **slot; | |
373 | ||
374 | ent.key = t; | |
c203e8a7 | 375 | slot = tree_htab->find_slot (&ent, NO_INSERT); |
331c7fcd EB |
376 | gcc_assert (slot); |
377 | free (*slot); | |
c203e8a7 | 378 | tree_htab->clear_slot (slot); |
d7f09764 DN |
379 | } |
380 | #endif | |
381 | ||
382 | ||
383 | /* Check that the version MAJOR.MINOR is the correct version number. */ | |
384 | ||
385 | void | |
386 | lto_check_version (int major, int minor) | |
387 | { | |
388 | if (major != LTO_major_version || minor != LTO_minor_version) | |
40fecdd6 JM |
389 | fatal_error (input_location, |
390 | "bytecode stream generated with LTO version %d.%d instead " | |
d7f09764 DN |
391 | "of the expected %d.%d", |
392 | major, minor, | |
393 | LTO_major_version, LTO_minor_version); | |
394 | } | |
47c79d56 DN |
395 | |
396 | ||
47c79d56 DN |
397 | /* Initialize all the streamer hooks used for streaming GIMPLE. */ |
398 | ||
399 | void | |
400 | lto_streamer_hooks_init (void) | |
401 | { | |
402 | streamer_hooks_init (); | |
b9393656 DN |
403 | streamer_hooks.write_tree = lto_output_tree; |
404 | streamer_hooks.read_tree = lto_input_tree; | |
7cb7d208 RB |
405 | streamer_hooks.input_location = lto_input_location; |
406 | streamer_hooks.output_location = lto_output_location; | |
47c79d56 | 407 | } |