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7bfefa9d | 1 | /* Input functions for reading LTO sections. |
2 | ||
fbd26352 | 3 | Copyright (C) 2009-2019 Free Software Foundation, Inc. |
7bfefa9d | 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" | |
9ef16211 | 25 | #include "backend.h" |
7c29e30e | 26 | #include "rtl.h" |
b20a8bb4 | 27 | #include "tree.h" |
b23fb4cb | 28 | #include "gimple.h" |
7c29e30e | 29 | #include "cgraph.h" |
30 | #include "lto-streamer.h" | |
7bfefa9d | 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", | |
2e295599 | 39 | "statics", |
02b699d5 | 40 | "symtab", |
8d810329 | 41 | "refs", |
65d1b157 | 42 | "asm", |
2e295599 | 43 | "jmpfuncs", |
44 | "pureconst", | |
45 | "reference", | |
9e179a64 | 46 | "profile", |
341eb035 | 47 | "symbol_nodes", |
1bf41320 | 48 | "opts", |
c7b2cc59 | 49 | "cgraphopt", |
803a7988 | 50 | "inline", |
52200d03 | 51 | "ipcp_trans", |
dccabdd1 | 52 | "icf", |
2e971afd | 53 | "offload_table", |
56686608 | 54 | "mode_table", |
55 | "hsa" | |
7bfefa9d | 56 | }; |
57 | ||
7bfefa9d | 58 | |
7bfefa9d | 59 | /* Hooks so that the ipa passes can call into the lto front end to get |
60 | sections. */ | |
61 | ||
48e1416a | 62 | static struct lto_file_decl_data ** file_decl_data; |
7bfefa9d | 63 | static lto_get_section_data_f* get_section_f; |
64 | static lto_free_section_data_f* free_section_f; | |
65 | ||
66 | ||
67 | /* This is called from the lto front end to set up the hooks that are | |
68 | used by the ipa passes to get the data that they will | |
69 | deserialize. */ | |
70 | ||
48e1416a | 71 | void |
72 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
7bfefa9d | 73 | lto_get_section_data_f* get_f, |
74 | lto_free_section_data_f* free_f) | |
75 | { | |
76 | file_decl_data = data; | |
77 | get_section_f = get_f; | |
78 | free_section_f = free_f; | |
79 | } | |
80 | ||
81 | ||
82 | /* Return an array of file decl datas for all of the files passed to | |
83 | this compilation. */ | |
84 | ||
85 | struct lto_file_decl_data ** | |
86 | lto_get_file_decl_data (void) | |
87 | { | |
88 | gcc_assert (file_decl_data); | |
89 | return file_decl_data; | |
90 | } | |
91 | ||
92 | /* Buffer structure for accumulating data from compression callbacks. */ | |
93 | ||
94 | struct lto_buffer | |
95 | { | |
96 | char *data; | |
97 | size_t length; | |
98 | }; | |
99 | ||
100 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
101 | to by OPAQUE. */ | |
102 | ||
103 | static void | |
104 | lto_append_data (const char *data, unsigned length, void *opaque) | |
105 | { | |
106 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
107 | ||
108 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
109 | memcpy (buffer->data + buffer->length, data, length); | |
110 | buffer->length += length; | |
111 | } | |
112 | ||
113 | /* Header placed in returned uncompressed data streams. Allows the | |
114 | uncompressed allocated data to be mapped back to the underlying | |
115 | compressed data for use with free_section_f. */ | |
116 | ||
117 | struct lto_data_header | |
118 | { | |
119 | const char *data; | |
120 | size_t len; | |
121 | }; | |
122 | ||
123 | /* Return a char pointer to the start of a data stream for an LTO pass | |
124 | or function. FILE_DATA indicates where to obtain the data. | |
125 | SECTION_TYPE is the type of information to be obtained. NAME is | |
126 | the name of the function and is only used when finding a function | |
127 | body; otherwise it is NULL. LEN is the size of the data | |
128 | returned. */ | |
129 | ||
130 | const char * | |
48e1416a | 131 | lto_get_section_data (struct lto_file_decl_data *file_data, |
7bfefa9d | 132 | enum lto_section_type section_type, |
48e1416a | 133 | const char *name, |
6cbd82a6 | 134 | size_t *len, bool decompress) |
7bfefa9d | 135 | { |
136 | const char *data = (get_section_f) (file_data, section_type, name, len); | |
137 | const size_t header_length = sizeof (struct lto_data_header); | |
138 | struct lto_data_header *header; | |
139 | struct lto_buffer buffer; | |
140 | struct lto_compression_stream *stream; | |
141 | lto_stats.section_size[section_type] += *len; | |
142 | ||
143 | if (data == NULL) | |
144 | return NULL; | |
145 | ||
6cbd82a6 | 146 | /* WPA->ltrans streams are not compressed with exception of function bodies |
147 | and variable initializers that has been verbatim copied from earlier | |
148 | compilations. */ | |
149 | if (!flag_ltrans || decompress) | |
baa4a2c6 | 150 | { |
151 | /* Create a mapping header containing the underlying data and length, | |
152 | and prepend this to the uncompression buffer. The uncompressed data | |
153 | then follows, and a pointer to the start of the uncompressed data is | |
154 | returned. */ | |
155 | header = (struct lto_data_header *) xmalloc (header_length); | |
156 | header->data = data; | |
157 | header->len = *len; | |
158 | ||
159 | buffer.data = (char *) header; | |
160 | buffer.length = header_length; | |
161 | ||
162 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
163 | lto_uncompress_block (stream, data, *len); | |
164 | lto_end_uncompression (stream); | |
165 | ||
166 | *len = buffer.length - header_length; | |
167 | data = buffer.data + header_length; | |
168 | } | |
169 | ||
4692b23a | 170 | lto_check_version (((const lto_header *)data)->major_version, |
374d90a7 | 171 | ((const lto_header *)data)->minor_version, |
172 | file_data->file_name); | |
baa4a2c6 | 173 | return data; |
7bfefa9d | 174 | } |
175 | ||
6cbd82a6 | 176 | /* Get the section data without any header parsing or uncompression. */ |
177 | ||
178 | const char * | |
179 | lto_get_raw_section_data (struct lto_file_decl_data *file_data, | |
180 | enum lto_section_type section_type, | |
181 | const char *name, | |
182 | size_t *len) | |
183 | { | |
184 | return (get_section_f) (file_data, section_type, name, len); | |
185 | } | |
7bfefa9d | 186 | |
187 | /* Free the data found from the above call. The first three | |
188 | parameters are the same as above. DATA is the data to be freed and | |
189 | LEN is the length of that data. */ | |
190 | ||
48e1416a | 191 | void |
192 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
7bfefa9d | 193 | enum lto_section_type section_type, |
194 | const char *name, | |
195 | const char *data, | |
6cbd82a6 | 196 | size_t len, bool decompress) |
7bfefa9d | 197 | { |
198 | const size_t header_length = sizeof (struct lto_data_header); | |
199 | const char *real_data = data - header_length; | |
200 | const struct lto_data_header *header | |
201 | = (const struct lto_data_header *) real_data; | |
202 | ||
203 | gcc_assert (free_section_f); | |
204 | ||
6cbd82a6 | 205 | if (flag_ltrans && !decompress) |
7bfefa9d | 206 | { |
207 | (free_section_f) (file_data, section_type, name, data, len); | |
208 | return; | |
209 | } | |
210 | ||
211 | /* The underlying data address has been extracted from the mapping header. | |
212 | Free that, then free the allocated uncompression buffer. */ | |
213 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
214 | free (CONST_CAST (char *, real_data)); | |
215 | } | |
216 | ||
6cbd82a6 | 217 | /* Free data allocated by lto_get_raw_section_data. */ |
218 | ||
219 | void | |
220 | lto_free_raw_section_data (struct lto_file_decl_data *file_data, | |
221 | enum lto_section_type section_type, | |
222 | const char *name, | |
223 | const char *data, | |
224 | size_t len) | |
225 | { | |
226 | (free_section_f) (file_data, section_type, name, data, len); | |
227 | } | |
7bfefa9d | 228 | |
229 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
230 | header and then return an input block pointing to the section. The | |
231 | raw pointer to the section is returned in DATAR and LEN. These are | |
232 | used to free the section. Return NULL if the section is not present. */ | |
233 | ||
234 | struct lto_input_block * | |
48e1416a | 235 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 236 | enum lto_section_type section_type, |
237 | const char **datar, size_t *len) | |
238 | { | |
239 | const char *data = lto_get_section_data (file_data, section_type, NULL, len); | |
48e1416a | 240 | const struct lto_simple_header * header |
7bfefa9d | 241 | = (const struct lto_simple_header *) data; |
242 | ||
949e5786 | 243 | int main_offset = sizeof (struct lto_simple_header); |
7bfefa9d | 244 | |
245 | if (!data) | |
246 | return NULL; | |
247 | ||
7bfefa9d | 248 | *datar = data; |
2e971afd | 249 | return new lto_input_block (data + main_offset, header->main_size, |
250 | file_data->mode_table); | |
7bfefa9d | 251 | } |
252 | ||
253 | ||
254 | /* Close the section returned from a call to | |
255 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
256 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
257 | passed to that call and the DATA and LEN are what was returned from | |
258 | that call. */ | |
259 | ||
260 | void | |
48e1416a | 261 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 262 | enum lto_section_type section_type, |
263 | struct lto_input_block *ib, | |
264 | const char *data, size_t len) | |
265 | { | |
472ca566 | 266 | delete ib; |
7bfefa9d | 267 | lto_free_section_data (file_data, section_type, NULL, data, len); |
268 | } | |
269 | ||
270 | /*****************************************************************************/ | |
271 | /* Record renamings of static declarations */ | |
272 | /*****************************************************************************/ | |
273 | ||
274 | struct lto_renaming_slot | |
275 | { | |
276 | const char *old_name; | |
277 | const char *new_name; | |
278 | }; | |
279 | ||
280 | /* Returns a hash code for P. */ | |
281 | ||
282 | static hashval_t | |
283 | hash_name (const void *p) | |
284 | { | |
285 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
286 | return (hashval_t) htab_hash_string (ds->new_name); | |
287 | } | |
288 | ||
289 | /* Returns nonzero if P1 and P2 are equal. */ | |
290 | ||
291 | static int | |
292 | eq_name (const void *p1, const void *p2) | |
293 | { | |
294 | const struct lto_renaming_slot *s1 = | |
295 | (const struct lto_renaming_slot *) p1; | |
296 | const struct lto_renaming_slot *s2 = | |
297 | (const struct lto_renaming_slot *) p2; | |
298 | ||
299 | return strcmp (s1->new_name, s2->new_name) == 0; | |
300 | } | |
301 | ||
302 | /* Free a renaming table entry. */ | |
303 | ||
304 | static void | |
305 | renaming_slot_free (void *slot) | |
306 | { | |
307 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
308 | ||
309 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
310 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
311 | free ((void *) s); | |
312 | } | |
313 | ||
314 | /* Create an empty hash table for recording declaration renamings. */ | |
315 | ||
316 | htab_t | |
317 | lto_create_renaming_table (void) | |
318 | { | |
319 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
320 | } | |
321 | ||
322 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
323 | holds the renaming hash table to use. */ | |
324 | ||
325 | void | |
326 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
327 | const char *old_name, const char *new_name) | |
328 | { | |
329 | void **slot; | |
330 | struct lto_renaming_slot r_slot; | |
331 | ||
332 | r_slot.new_name = new_name; | |
333 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
334 | if (*slot == NULL) | |
335 | { | |
336 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
337 | new_slot->old_name = xstrdup (old_name); | |
338 | new_slot->new_name = xstrdup (new_name); | |
339 | *slot = new_slot; | |
340 | } | |
341 | else | |
342 | gcc_unreachable (); | |
343 | } | |
344 | ||
345 | ||
346 | /* Given a string NAME, return the string that it has been mapped to | |
347 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
348 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
349 | ||
350 | const char * | |
351 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
352 | const char *name) | |
353 | { | |
354 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
355 | struct lto_renaming_slot *slot; | |
356 | struct lto_renaming_slot r_slot; | |
357 | ||
358 | r_slot.new_name = name; | |
359 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
360 | if (slot) | |
361 | return slot->old_name; | |
362 | else | |
363 | return name; | |
364 | } | |
365 | ||
366 | /*****************************************************************************/ | |
367 | /* Input decl state object. */ | |
368 | /*****************************************************************************/ | |
369 | ||
370 | /* Return a newly created in-decl state object. */ | |
371 | ||
372 | struct lto_in_decl_state * | |
373 | lto_new_in_decl_state (void) | |
374 | { | |
25a27413 | 375 | return ggc_cleared_alloc<lto_in_decl_state> (); |
7bfefa9d | 376 | } |
377 | ||
378 | /* Delete STATE and its components. */ | |
379 | ||
380 | void | |
381 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
382 | { | |
383 | int i; | |
384 | ||
385 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 386 | vec_free (state->streams[i]); |
57305941 | 387 | ggc_free (state); |
7bfefa9d | 388 | } |
389 | ||
7bfefa9d | 390 | /* Search the in-decl state of a function FUNC contained in the file |
391 | associated with FILE_DATA. Return NULL if not found. */ | |
392 | ||
393 | struct lto_in_decl_state* | |
394 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
395 | tree func) | |
396 | { | |
397 | struct lto_in_decl_state temp; | |
9f9f871f | 398 | lto_in_decl_state **slot; |
7bfefa9d | 399 | |
400 | temp.fn_decl = func; | |
9f9f871f | 401 | slot = file_data->function_decl_states->find_slot (&temp, NO_INSERT); |
402 | return slot? *slot : NULL; | |
7bfefa9d | 403 | } |
673ca05f | 404 | |
5f74a074 | 405 | /* Free decl_states. */ |
406 | ||
407 | void | |
408 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
409 | { | |
410 | int i; | |
411 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 412 | vec_free (state->streams[i]); |
5f74a074 | 413 | ggc_free (state); |
414 | } | |
415 | ||
416 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
417 | release trees needed by the NODE's body. */ | |
418 | ||
419 | void | |
452659af | 420 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
5f74a074 | 421 | { |
422 | struct lto_in_decl_state temp; | |
9f9f871f | 423 | lto_in_decl_state **slot; |
5f74a074 | 424 | |
02774f2d | 425 | if (!node->lto_file_data) |
5f74a074 | 426 | return; |
427 | ||
02774f2d | 428 | temp.fn_decl = node->decl; |
9f9f871f | 429 | slot |
430 | = node->lto_file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
5f74a074 | 431 | if (slot && *slot) |
432 | { | |
9f9f871f | 433 | lto_free_function_in_decl_state (*slot); |
434 | node->lto_file_data->function_decl_states->clear_slot (slot); | |
5f74a074 | 435 | } |
02774f2d | 436 | node->lto_file_data = NULL; |
5f74a074 | 437 | } |
438 | ||
673ca05f | 439 | |
440 | /* Report read pass end of the section. */ | |
441 | ||
442 | void | |
443 | lto_section_overrun (struct lto_input_block *ib) | |
444 | { | |
c05be867 | 445 | fatal_error (input_location, "bytecode stream: trying to read %d bytes " |
5f8d4adf | 446 | "after the end of the input buffer", ib->p - ib->len); |
447 | } | |
448 | ||
449 | /* Report out of range value. */ | |
450 | ||
451 | void | |
452 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
453 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
454 | { | |
c05be867 | 455 | fatal_error (input_location, |
456 | "%s out of range: Range is %i to %i, value is %i", | |
5f8d4adf | 457 | purpose, (int)min, (int)max, (int)val); |
673ca05f | 458 | } |