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d7f09764 DN |
1 | /* Input functions for reading LTO sections. |
2 | ||
99dee823 | 3 | Copyright (C) 2009-2021 Free Software Foundation, Inc. |
d7f09764 DN |
4 | Contributed by Kenneth Zadeck <zadeck@naturalbridge.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" | |
c7131fb2 | 25 | #include "backend.h" |
957060b5 | 26 | #include "rtl.h" |
40e23961 | 27 | #include "tree.h" |
8e9055ae | 28 | #include "gimple.h" |
957060b5 AM |
29 | #include "cgraph.h" |
30 | #include "lto-streamer.h" | |
d7f09764 DN |
31 | #include "lto-compress.h" |
32 | ||
33 | /* Section names. These must correspond to the values of | |
34 | enum lto_section_type. */ | |
35 | const char *lto_section_name[LTO_N_SECTION_TYPES] = | |
36 | { | |
37 | "decls", | |
38 | "function_body", | |
0b394350 | 39 | "statics", |
ab96cc5b | 40 | "symtab", |
c8429c2a | 41 | "ext_symtab", |
369451ec | 42 | "refs", |
49f836ba | 43 | "asm", |
0b394350 AK |
44 | "jmpfuncs", |
45 | "pureconst", | |
46 | "reference", | |
0208f7da | 47 | "profile", |
15d0e7a0 | 48 | "symbol_nodes", |
922f15c2 | 49 | "opts", |
10a5dd5d | 50 | "cgraphopt", |
2c9561b5 | 51 | "inline", |
b84d4347 | 52 | "ipcp_trans", |
ec6fe917 | 53 | "icf", |
db847fa8 | 54 | "offload_table", |
b2b40051 | 55 | "mode_table", |
ff6686d2 | 56 | "lto", |
3fb68f2e JH |
57 | "ipa_sra", |
58 | "odr_types", | |
d119f34c | 59 | "ipa_modref", |
d7f09764 DN |
60 | }; |
61 | ||
d7f09764 DN |
62 | /* Hooks so that the ipa passes can call into the lto front end to get |
63 | sections. */ | |
64 | ||
b8698a0f | 65 | static struct lto_file_decl_data ** file_decl_data; |
d7f09764 DN |
66 | static lto_get_section_data_f* get_section_f; |
67 | static lto_free_section_data_f* free_section_f; | |
68 | ||
69 | ||
70 | /* This is called from the lto front end to set up the hooks that are | |
71 | used by the ipa passes to get the data that they will | |
72 | deserialize. */ | |
73 | ||
b8698a0f L |
74 | void |
75 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
d7f09764 DN |
76 | lto_get_section_data_f* get_f, |
77 | lto_free_section_data_f* free_f) | |
78 | { | |
79 | file_decl_data = data; | |
80 | get_section_f = get_f; | |
81 | free_section_f = free_f; | |
82 | } | |
83 | ||
84 | ||
85 | /* Return an array of file decl datas for all of the files passed to | |
86 | this compilation. */ | |
87 | ||
88 | struct lto_file_decl_data ** | |
89 | lto_get_file_decl_data (void) | |
90 | { | |
91 | gcc_assert (file_decl_data); | |
92 | return file_decl_data; | |
93 | } | |
94 | ||
95 | /* Buffer structure for accumulating data from compression callbacks. */ | |
96 | ||
97 | struct lto_buffer | |
98 | { | |
99 | char *data; | |
100 | size_t length; | |
101 | }; | |
102 | ||
103 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
104 | to by OPAQUE. */ | |
105 | ||
106 | static void | |
107 | lto_append_data (const char *data, unsigned length, void *opaque) | |
108 | { | |
109 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
110 | ||
111 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
112 | memcpy (buffer->data + buffer->length, data, length); | |
113 | buffer->length += length; | |
114 | } | |
115 | ||
116 | /* Header placed in returned uncompressed data streams. Allows the | |
117 | uncompressed allocated data to be mapped back to the underlying | |
118 | compressed data for use with free_section_f. */ | |
119 | ||
120 | struct lto_data_header | |
121 | { | |
122 | const char *data; | |
123 | size_t len; | |
124 | }; | |
125 | ||
126 | /* Return a char pointer to the start of a data stream for an LTO pass | |
127 | or function. FILE_DATA indicates where to obtain the data. | |
128 | SECTION_TYPE is the type of information to be obtained. NAME is | |
129 | the name of the function and is only used when finding a function | |
130 | body; otherwise it is NULL. LEN is the size of the data | |
131 | returned. */ | |
132 | ||
133 | const char * | |
b8698a0f | 134 | lto_get_section_data (struct lto_file_decl_data *file_data, |
d7f09764 | 135 | enum lto_section_type section_type, |
3c56d8d8 | 136 | const char *name, int order, |
ca834876 | 137 | size_t *len, bool decompress) |
d7f09764 | 138 | { |
3c56d8d8 ML |
139 | const char *data = (get_section_f) (file_data, section_type, name, order, |
140 | len); | |
d7f09764 DN |
141 | const size_t header_length = sizeof (struct lto_data_header); |
142 | struct lto_data_header *header; | |
143 | struct lto_buffer buffer; | |
144 | struct lto_compression_stream *stream; | |
145 | lto_stats.section_size[section_type] += *len; | |
146 | ||
147 | if (data == NULL) | |
148 | return NULL; | |
149 | ||
ca834876 JH |
150 | /* WPA->ltrans streams are not compressed with exception of function bodies |
151 | and variable initializers that has been verbatim copied from earlier | |
152 | compilations. */ | |
88614dfa | 153 | if ((!flag_ltrans || decompress) && section_type != LTO_section_lto) |
91856735 RB |
154 | { |
155 | /* Create a mapping header containing the underlying data and length, | |
156 | and prepend this to the uncompression buffer. The uncompressed data | |
157 | then follows, and a pointer to the start of the uncompressed data is | |
158 | returned. */ | |
159 | header = (struct lto_data_header *) xmalloc (header_length); | |
160 | header->data = data; | |
161 | header->len = *len; | |
162 | ||
163 | buffer.data = (char *) header; | |
164 | buffer.length = header_length; | |
165 | ||
166 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
167 | lto_uncompress_block (stream, data, *len); | |
d1caf05a ML |
168 | lto_end_uncompression (stream, |
169 | file_data->lto_section_header.get_compression ()); | |
91856735 RB |
170 | |
171 | *len = buffer.length - header_length; | |
172 | data = buffer.data + header_length; | |
173 | } | |
174 | ||
91856735 | 175 | return data; |
d7f09764 DN |
176 | } |
177 | ||
3c56d8d8 ML |
178 | /* Return a char pointer to the start of a data stream for an LTO pass. |
179 | FILE_DATA indicates where to obtain the data. | |
180 | SECTION_TYPE is the type of information to be obtained. | |
181 | LEN is the size of the data returned. */ | |
182 | ||
183 | const char * | |
184 | lto_get_summary_section_data (struct lto_file_decl_data *file_data, | |
185 | enum lto_section_type section_type, size_t *len) | |
186 | { | |
187 | return lto_get_section_data (file_data, section_type, NULL, 0, len); | |
188 | } | |
189 | ||
ca834876 JH |
190 | /* Get the section data without any header parsing or uncompression. */ |
191 | ||
192 | const char * | |
193 | lto_get_raw_section_data (struct lto_file_decl_data *file_data, | |
194 | enum lto_section_type section_type, | |
3c56d8d8 | 195 | const char *name, int order, |
ca834876 JH |
196 | size_t *len) |
197 | { | |
3c56d8d8 | 198 | return (get_section_f) (file_data, section_type, name, order, len); |
ca834876 | 199 | } |
d7f09764 DN |
200 | |
201 | /* Free the data found from the above call. The first three | |
202 | parameters are the same as above. DATA is the data to be freed and | |
203 | LEN is the length of that data. */ | |
204 | ||
b8698a0f L |
205 | void |
206 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
d7f09764 DN |
207 | enum lto_section_type section_type, |
208 | const char *name, | |
209 | const char *data, | |
ca834876 | 210 | size_t len, bool decompress) |
d7f09764 DN |
211 | { |
212 | const size_t header_length = sizeof (struct lto_data_header); | |
213 | const char *real_data = data - header_length; | |
214 | const struct lto_data_header *header | |
215 | = (const struct lto_data_header *) real_data; | |
216 | ||
217 | gcc_assert (free_section_f); | |
218 | ||
ca834876 | 219 | if (flag_ltrans && !decompress) |
d7f09764 DN |
220 | { |
221 | (free_section_f) (file_data, section_type, name, data, len); | |
222 | return; | |
223 | } | |
224 | ||
225 | /* The underlying data address has been extracted from the mapping header. | |
226 | Free that, then free the allocated uncompression buffer. */ | |
227 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
228 | free (CONST_CAST (char *, real_data)); | |
229 | } | |
230 | ||
ca834876 JH |
231 | /* Free data allocated by lto_get_raw_section_data. */ |
232 | ||
233 | void | |
234 | lto_free_raw_section_data (struct lto_file_decl_data *file_data, | |
235 | enum lto_section_type section_type, | |
236 | const char *name, | |
237 | const char *data, | |
238 | size_t len) | |
239 | { | |
240 | (free_section_f) (file_data, section_type, name, data, len); | |
241 | } | |
d7f09764 DN |
242 | |
243 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
244 | header and then return an input block pointing to the section. The | |
245 | raw pointer to the section is returned in DATAR and LEN. These are | |
246 | used to free the section. Return NULL if the section is not present. */ | |
247 | ||
99b1c316 | 248 | class lto_input_block * |
b8698a0f | 249 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 DN |
250 | enum lto_section_type section_type, |
251 | const char **datar, size_t *len) | |
252 | { | |
3c56d8d8 ML |
253 | const char *data = lto_get_section_data (file_data, section_type, NULL, 0, |
254 | len); | |
b8698a0f | 255 | const struct lto_simple_header * header |
d7f09764 DN |
256 | = (const struct lto_simple_header *) data; |
257 | ||
4ad9a9de | 258 | int main_offset = sizeof (struct lto_simple_header); |
d7f09764 DN |
259 | |
260 | if (!data) | |
261 | return NULL; | |
262 | ||
d7f09764 | 263 | *datar = data; |
db847fa8 JJ |
264 | return new lto_input_block (data + main_offset, header->main_size, |
265 | file_data->mode_table); | |
d7f09764 DN |
266 | } |
267 | ||
268 | ||
269 | /* Close the section returned from a call to | |
270 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
271 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
272 | passed to that call and the DATA and LEN are what was returned from | |
273 | that call. */ | |
274 | ||
275 | void | |
b8698a0f | 276 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 | 277 | enum lto_section_type section_type, |
99b1c316 | 278 | class lto_input_block *ib, |
d7f09764 DN |
279 | const char *data, size_t len) |
280 | { | |
207c68cd | 281 | delete ib; |
d7f09764 DN |
282 | lto_free_section_data (file_data, section_type, NULL, data, len); |
283 | } | |
284 | ||
285 | /*****************************************************************************/ | |
286 | /* Record renamings of static declarations */ | |
287 | /*****************************************************************************/ | |
288 | ||
289 | struct lto_renaming_slot | |
290 | { | |
291 | const char *old_name; | |
292 | const char *new_name; | |
293 | }; | |
294 | ||
295 | /* Returns a hash code for P. */ | |
296 | ||
297 | static hashval_t | |
298 | hash_name (const void *p) | |
299 | { | |
300 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
301 | return (hashval_t) htab_hash_string (ds->new_name); | |
302 | } | |
303 | ||
304 | /* Returns nonzero if P1 and P2 are equal. */ | |
305 | ||
306 | static int | |
307 | eq_name (const void *p1, const void *p2) | |
308 | { | |
309 | const struct lto_renaming_slot *s1 = | |
310 | (const struct lto_renaming_slot *) p1; | |
311 | const struct lto_renaming_slot *s2 = | |
312 | (const struct lto_renaming_slot *) p2; | |
313 | ||
314 | return strcmp (s1->new_name, s2->new_name) == 0; | |
315 | } | |
316 | ||
317 | /* Free a renaming table entry. */ | |
318 | ||
319 | static void | |
320 | renaming_slot_free (void *slot) | |
321 | { | |
322 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
323 | ||
324 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
325 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
326 | free ((void *) s); | |
327 | } | |
328 | ||
329 | /* Create an empty hash table for recording declaration renamings. */ | |
330 | ||
331 | htab_t | |
332 | lto_create_renaming_table (void) | |
333 | { | |
334 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
335 | } | |
336 | ||
337 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
338 | holds the renaming hash table to use. */ | |
339 | ||
340 | void | |
341 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
342 | const char *old_name, const char *new_name) | |
343 | { | |
344 | void **slot; | |
345 | struct lto_renaming_slot r_slot; | |
346 | ||
347 | r_slot.new_name = new_name; | |
348 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
349 | if (*slot == NULL) | |
350 | { | |
351 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
352 | new_slot->old_name = xstrdup (old_name); | |
353 | new_slot->new_name = xstrdup (new_name); | |
354 | *slot = new_slot; | |
355 | } | |
356 | else | |
357 | gcc_unreachable (); | |
358 | } | |
359 | ||
360 | ||
361 | /* Given a string NAME, return the string that it has been mapped to | |
362 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
363 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
364 | ||
365 | const char * | |
366 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
367 | const char *name) | |
368 | { | |
369 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
370 | struct lto_renaming_slot *slot; | |
371 | struct lto_renaming_slot r_slot; | |
372 | ||
373 | r_slot.new_name = name; | |
374 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
375 | if (slot) | |
376 | return slot->old_name; | |
377 | else | |
378 | return name; | |
379 | } | |
380 | ||
381 | /*****************************************************************************/ | |
382 | /* Input decl state object. */ | |
383 | /*****************************************************************************/ | |
384 | ||
385 | /* Return a newly created in-decl state object. */ | |
386 | ||
387 | struct lto_in_decl_state * | |
388 | lto_new_in_decl_state (void) | |
389 | { | |
766090c2 | 390 | return ggc_cleared_alloc<lto_in_decl_state> (); |
d7f09764 DN |
391 | } |
392 | ||
393 | /* Delete STATE and its components. */ | |
394 | ||
395 | void | |
396 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
397 | { | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
9c71e9df | 401 | vec_free (state->streams[i]); |
49ba8180 | 402 | ggc_free (state); |
d7f09764 DN |
403 | } |
404 | ||
d7f09764 DN |
405 | /* Search the in-decl state of a function FUNC contained in the file |
406 | associated with FILE_DATA. Return NULL if not found. */ | |
407 | ||
408 | struct lto_in_decl_state* | |
409 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
410 | tree func) | |
411 | { | |
412 | struct lto_in_decl_state temp; | |
907dadbd | 413 | lto_in_decl_state **slot; |
d7f09764 DN |
414 | |
415 | temp.fn_decl = func; | |
907dadbd TS |
416 | slot = file_data->function_decl_states->find_slot (&temp, NO_INSERT); |
417 | return slot? *slot : NULL; | |
d7f09764 | 418 | } |
bc0fe8cb | 419 | |
256eefa9 JH |
420 | /* Free decl_states. */ |
421 | ||
422 | void | |
423 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
424 | { | |
425 | int i; | |
426 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
9c71e9df | 427 | vec_free (state->streams[i]); |
256eefa9 JH |
428 | ggc_free (state); |
429 | } | |
430 | ||
431 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
432 | release trees needed by the NODE's body. */ | |
433 | ||
434 | void | |
5e20cdc9 | 435 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
256eefa9 JH |
436 | { |
437 | struct lto_in_decl_state temp; | |
907dadbd | 438 | lto_in_decl_state **slot; |
256eefa9 | 439 | |
67348ccc | 440 | if (!node->lto_file_data) |
256eefa9 JH |
441 | return; |
442 | ||
67348ccc | 443 | temp.fn_decl = node->decl; |
907dadbd TS |
444 | slot |
445 | = node->lto_file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
256eefa9 JH |
446 | if (slot && *slot) |
447 | { | |
907dadbd TS |
448 | lto_free_function_in_decl_state (*slot); |
449 | node->lto_file_data->function_decl_states->clear_slot (slot); | |
256eefa9 | 450 | } |
67348ccc | 451 | node->lto_file_data = NULL; |
256eefa9 JH |
452 | } |
453 | ||
bc0fe8cb JH |
454 | |
455 | /* Report read pass end of the section. */ | |
456 | ||
457 | void | |
99b1c316 | 458 | lto_section_overrun (class lto_input_block *ib) |
bc0fe8cb | 459 | { |
40fecdd6 | 460 | fatal_error (input_location, "bytecode stream: trying to read %d bytes " |
f242c0a5 JH |
461 | "after the end of the input buffer", ib->p - ib->len); |
462 | } | |
463 | ||
464 | /* Report out of range value. */ | |
465 | ||
466 | void | |
467 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
468 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
469 | { | |
40fecdd6 JM |
470 | fatal_error (input_location, |
471 | "%s out of range: Range is %i to %i, value is %i", | |
f242c0a5 | 472 | purpose, (int)min, (int)max, (int)val); |
bc0fe8cb | 473 | } |