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d7f09764 DN |
1 | /* Input functions for reading LTO sections. |
2 | ||
a5544970 | 3 | Copyright (C) 2009-2019 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", |
369451ec | 41 | "refs", |
49f836ba | 42 | "asm", |
0b394350 AK |
43 | "jmpfuncs", |
44 | "pureconst", | |
45 | "reference", | |
0208f7da | 46 | "profile", |
15d0e7a0 | 47 | "symbol_nodes", |
922f15c2 | 48 | "opts", |
10a5dd5d | 49 | "cgraphopt", |
2c9561b5 | 50 | "inline", |
b84d4347 | 51 | "ipcp_trans", |
ec6fe917 | 52 | "icf", |
db847fa8 | 53 | "offload_table", |
b2b40051 | 54 | "mode_table", |
88614dfa | 55 | "hsa", |
ff6686d2 | 56 | "lto", |
b7bb3d35 | 57 | "ipa_sra" |
d7f09764 DN |
58 | }; |
59 | ||
d7f09764 DN |
60 | /* Hooks so that the ipa passes can call into the lto front end to get |
61 | sections. */ | |
62 | ||
b8698a0f | 63 | static struct lto_file_decl_data ** file_decl_data; |
d7f09764 DN |
64 | static lto_get_section_data_f* get_section_f; |
65 | static lto_free_section_data_f* free_section_f; | |
66 | ||
67 | ||
68 | /* This is called from the lto front end to set up the hooks that are | |
69 | used by the ipa passes to get the data that they will | |
70 | deserialize. */ | |
71 | ||
b8698a0f L |
72 | void |
73 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
d7f09764 DN |
74 | lto_get_section_data_f* get_f, |
75 | lto_free_section_data_f* free_f) | |
76 | { | |
77 | file_decl_data = data; | |
78 | get_section_f = get_f; | |
79 | free_section_f = free_f; | |
80 | } | |
81 | ||
82 | ||
83 | /* Return an array of file decl datas for all of the files passed to | |
84 | this compilation. */ | |
85 | ||
86 | struct lto_file_decl_data ** | |
87 | lto_get_file_decl_data (void) | |
88 | { | |
89 | gcc_assert (file_decl_data); | |
90 | return file_decl_data; | |
91 | } | |
92 | ||
93 | /* Buffer structure for accumulating data from compression callbacks. */ | |
94 | ||
95 | struct lto_buffer | |
96 | { | |
97 | char *data; | |
98 | size_t length; | |
99 | }; | |
100 | ||
101 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
102 | to by OPAQUE. */ | |
103 | ||
104 | static void | |
105 | lto_append_data (const char *data, unsigned length, void *opaque) | |
106 | { | |
107 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
108 | ||
109 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
110 | memcpy (buffer->data + buffer->length, data, length); | |
111 | buffer->length += length; | |
112 | } | |
113 | ||
114 | /* Header placed in returned uncompressed data streams. Allows the | |
115 | uncompressed allocated data to be mapped back to the underlying | |
116 | compressed data for use with free_section_f. */ | |
117 | ||
118 | struct lto_data_header | |
119 | { | |
120 | const char *data; | |
121 | size_t len; | |
122 | }; | |
123 | ||
124 | /* Return a char pointer to the start of a data stream for an LTO pass | |
125 | or function. FILE_DATA indicates where to obtain the data. | |
126 | SECTION_TYPE is the type of information to be obtained. NAME is | |
127 | the name of the function and is only used when finding a function | |
128 | body; otherwise it is NULL. LEN is the size of the data | |
129 | returned. */ | |
130 | ||
131 | const char * | |
b8698a0f | 132 | lto_get_section_data (struct lto_file_decl_data *file_data, |
d7f09764 | 133 | enum lto_section_type section_type, |
b8698a0f | 134 | const char *name, |
ca834876 | 135 | size_t *len, bool decompress) |
d7f09764 DN |
136 | { |
137 | const char *data = (get_section_f) (file_data, section_type, name, len); | |
138 | const size_t header_length = sizeof (struct lto_data_header); | |
139 | struct lto_data_header *header; | |
140 | struct lto_buffer buffer; | |
141 | struct lto_compression_stream *stream; | |
142 | lto_stats.section_size[section_type] += *len; | |
143 | ||
144 | if (data == NULL) | |
145 | return NULL; | |
146 | ||
ca834876 JH |
147 | /* WPA->ltrans streams are not compressed with exception of function bodies |
148 | and variable initializers that has been verbatim copied from earlier | |
149 | compilations. */ | |
88614dfa | 150 | if ((!flag_ltrans || decompress) && section_type != LTO_section_lto) |
91856735 RB |
151 | { |
152 | /* Create a mapping header containing the underlying data and length, | |
153 | and prepend this to the uncompression buffer. The uncompressed data | |
154 | then follows, and a pointer to the start of the uncompressed data is | |
155 | returned. */ | |
156 | header = (struct lto_data_header *) xmalloc (header_length); | |
157 | header->data = data; | |
158 | header->len = *len; | |
159 | ||
160 | buffer.data = (char *) header; | |
161 | buffer.length = header_length; | |
162 | ||
163 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
164 | lto_uncompress_block (stream, data, *len); | |
d1caf05a ML |
165 | lto_end_uncompression (stream, |
166 | file_data->lto_section_header.get_compression ()); | |
91856735 RB |
167 | |
168 | *len = buffer.length - header_length; | |
169 | data = buffer.data + header_length; | |
170 | } | |
171 | ||
91856735 | 172 | return data; |
d7f09764 DN |
173 | } |
174 | ||
ca834876 JH |
175 | /* Get the section data without any header parsing or uncompression. */ |
176 | ||
177 | const char * | |
178 | lto_get_raw_section_data (struct lto_file_decl_data *file_data, | |
179 | enum lto_section_type section_type, | |
180 | const char *name, | |
181 | size_t *len) | |
182 | { | |
183 | return (get_section_f) (file_data, section_type, name, len); | |
184 | } | |
d7f09764 DN |
185 | |
186 | /* Free the data found from the above call. The first three | |
187 | parameters are the same as above. DATA is the data to be freed and | |
188 | LEN is the length of that data. */ | |
189 | ||
b8698a0f L |
190 | void |
191 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
d7f09764 DN |
192 | enum lto_section_type section_type, |
193 | const char *name, | |
194 | const char *data, | |
ca834876 | 195 | size_t len, bool decompress) |
d7f09764 DN |
196 | { |
197 | const size_t header_length = sizeof (struct lto_data_header); | |
198 | const char *real_data = data - header_length; | |
199 | const struct lto_data_header *header | |
200 | = (const struct lto_data_header *) real_data; | |
201 | ||
202 | gcc_assert (free_section_f); | |
203 | ||
ca834876 | 204 | if (flag_ltrans && !decompress) |
d7f09764 DN |
205 | { |
206 | (free_section_f) (file_data, section_type, name, data, len); | |
207 | return; | |
208 | } | |
209 | ||
210 | /* The underlying data address has been extracted from the mapping header. | |
211 | Free that, then free the allocated uncompression buffer. */ | |
212 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
213 | free (CONST_CAST (char *, real_data)); | |
214 | } | |
215 | ||
ca834876 JH |
216 | /* Free data allocated by lto_get_raw_section_data. */ |
217 | ||
218 | void | |
219 | lto_free_raw_section_data (struct lto_file_decl_data *file_data, | |
220 | enum lto_section_type section_type, | |
221 | const char *name, | |
222 | const char *data, | |
223 | size_t len) | |
224 | { | |
225 | (free_section_f) (file_data, section_type, name, data, len); | |
226 | } | |
d7f09764 DN |
227 | |
228 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
229 | header and then return an input block pointing to the section. The | |
230 | raw pointer to the section is returned in DATAR and LEN. These are | |
231 | used to free the section. Return NULL if the section is not present. */ | |
232 | ||
99b1c316 | 233 | class lto_input_block * |
b8698a0f | 234 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 DN |
235 | enum lto_section_type section_type, |
236 | const char **datar, size_t *len) | |
237 | { | |
238 | const char *data = lto_get_section_data (file_data, section_type, NULL, len); | |
b8698a0f | 239 | const struct lto_simple_header * header |
d7f09764 DN |
240 | = (const struct lto_simple_header *) data; |
241 | ||
4ad9a9de | 242 | int main_offset = sizeof (struct lto_simple_header); |
d7f09764 DN |
243 | |
244 | if (!data) | |
245 | return NULL; | |
246 | ||
d7f09764 | 247 | *datar = data; |
db847fa8 JJ |
248 | return new lto_input_block (data + main_offset, header->main_size, |
249 | file_data->mode_table); | |
d7f09764 DN |
250 | } |
251 | ||
252 | ||
253 | /* Close the section returned from a call to | |
254 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
255 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
256 | passed to that call and the DATA and LEN are what was returned from | |
257 | that call. */ | |
258 | ||
259 | void | |
b8698a0f | 260 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 | 261 | enum lto_section_type section_type, |
99b1c316 | 262 | class lto_input_block *ib, |
d7f09764 DN |
263 | const char *data, size_t len) |
264 | { | |
207c68cd | 265 | delete ib; |
d7f09764 DN |
266 | lto_free_section_data (file_data, section_type, NULL, data, len); |
267 | } | |
268 | ||
269 | /*****************************************************************************/ | |
270 | /* Record renamings of static declarations */ | |
271 | /*****************************************************************************/ | |
272 | ||
273 | struct lto_renaming_slot | |
274 | { | |
275 | const char *old_name; | |
276 | const char *new_name; | |
277 | }; | |
278 | ||
279 | /* Returns a hash code for P. */ | |
280 | ||
281 | static hashval_t | |
282 | hash_name (const void *p) | |
283 | { | |
284 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
285 | return (hashval_t) htab_hash_string (ds->new_name); | |
286 | } | |
287 | ||
288 | /* Returns nonzero if P1 and P2 are equal. */ | |
289 | ||
290 | static int | |
291 | eq_name (const void *p1, const void *p2) | |
292 | { | |
293 | const struct lto_renaming_slot *s1 = | |
294 | (const struct lto_renaming_slot *) p1; | |
295 | const struct lto_renaming_slot *s2 = | |
296 | (const struct lto_renaming_slot *) p2; | |
297 | ||
298 | return strcmp (s1->new_name, s2->new_name) == 0; | |
299 | } | |
300 | ||
301 | /* Free a renaming table entry. */ | |
302 | ||
303 | static void | |
304 | renaming_slot_free (void *slot) | |
305 | { | |
306 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
307 | ||
308 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
309 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
310 | free ((void *) s); | |
311 | } | |
312 | ||
313 | /* Create an empty hash table for recording declaration renamings. */ | |
314 | ||
315 | htab_t | |
316 | lto_create_renaming_table (void) | |
317 | { | |
318 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
319 | } | |
320 | ||
321 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
322 | holds the renaming hash table to use. */ | |
323 | ||
324 | void | |
325 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
326 | const char *old_name, const char *new_name) | |
327 | { | |
328 | void **slot; | |
329 | struct lto_renaming_slot r_slot; | |
330 | ||
331 | r_slot.new_name = new_name; | |
332 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
333 | if (*slot == NULL) | |
334 | { | |
335 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
336 | new_slot->old_name = xstrdup (old_name); | |
337 | new_slot->new_name = xstrdup (new_name); | |
338 | *slot = new_slot; | |
339 | } | |
340 | else | |
341 | gcc_unreachable (); | |
342 | } | |
343 | ||
344 | ||
345 | /* Given a string NAME, return the string that it has been mapped to | |
346 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
347 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
348 | ||
349 | const char * | |
350 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
351 | const char *name) | |
352 | { | |
353 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
354 | struct lto_renaming_slot *slot; | |
355 | struct lto_renaming_slot r_slot; | |
356 | ||
357 | r_slot.new_name = name; | |
358 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
359 | if (slot) | |
360 | return slot->old_name; | |
361 | else | |
362 | return name; | |
363 | } | |
364 | ||
365 | /*****************************************************************************/ | |
366 | /* Input decl state object. */ | |
367 | /*****************************************************************************/ | |
368 | ||
369 | /* Return a newly created in-decl state object. */ | |
370 | ||
371 | struct lto_in_decl_state * | |
372 | lto_new_in_decl_state (void) | |
373 | { | |
766090c2 | 374 | return ggc_cleared_alloc<lto_in_decl_state> (); |
d7f09764 DN |
375 | } |
376 | ||
377 | /* Delete STATE and its components. */ | |
378 | ||
379 | void | |
380 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
381 | { | |
382 | int i; | |
383 | ||
384 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
9c71e9df | 385 | vec_free (state->streams[i]); |
49ba8180 | 386 | ggc_free (state); |
d7f09764 DN |
387 | } |
388 | ||
d7f09764 DN |
389 | /* Search the in-decl state of a function FUNC contained in the file |
390 | associated with FILE_DATA. Return NULL if not found. */ | |
391 | ||
392 | struct lto_in_decl_state* | |
393 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
394 | tree func) | |
395 | { | |
396 | struct lto_in_decl_state temp; | |
907dadbd | 397 | lto_in_decl_state **slot; |
d7f09764 DN |
398 | |
399 | temp.fn_decl = func; | |
907dadbd TS |
400 | slot = file_data->function_decl_states->find_slot (&temp, NO_INSERT); |
401 | return slot? *slot : NULL; | |
d7f09764 | 402 | } |
bc0fe8cb | 403 | |
256eefa9 JH |
404 | /* Free decl_states. */ |
405 | ||
406 | void | |
407 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
408 | { | |
409 | int i; | |
410 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
9c71e9df | 411 | vec_free (state->streams[i]); |
256eefa9 JH |
412 | ggc_free (state); |
413 | } | |
414 | ||
415 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
416 | release trees needed by the NODE's body. */ | |
417 | ||
418 | void | |
5e20cdc9 | 419 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
256eefa9 JH |
420 | { |
421 | struct lto_in_decl_state temp; | |
907dadbd | 422 | lto_in_decl_state **slot; |
256eefa9 | 423 | |
67348ccc | 424 | if (!node->lto_file_data) |
256eefa9 JH |
425 | return; |
426 | ||
67348ccc | 427 | temp.fn_decl = node->decl; |
907dadbd TS |
428 | slot |
429 | = node->lto_file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
256eefa9 JH |
430 | if (slot && *slot) |
431 | { | |
907dadbd TS |
432 | lto_free_function_in_decl_state (*slot); |
433 | node->lto_file_data->function_decl_states->clear_slot (slot); | |
256eefa9 | 434 | } |
67348ccc | 435 | node->lto_file_data = NULL; |
256eefa9 JH |
436 | } |
437 | ||
bc0fe8cb JH |
438 | |
439 | /* Report read pass end of the section. */ | |
440 | ||
441 | void | |
99b1c316 | 442 | lto_section_overrun (class lto_input_block *ib) |
bc0fe8cb | 443 | { |
40fecdd6 | 444 | fatal_error (input_location, "bytecode stream: trying to read %d bytes " |
f242c0a5 JH |
445 | "after the end of the input buffer", ib->p - ib->len); |
446 | } | |
447 | ||
448 | /* Report out of range value. */ | |
449 | ||
450 | void | |
451 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
452 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
453 | { | |
40fecdd6 JM |
454 | fatal_error (input_location, |
455 | "%s out of range: Range is %i to %i, value is %i", | |
f242c0a5 | 456 | purpose, (int)min, (int)max, (int)val); |
bc0fe8cb | 457 | } |