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1 | /* Input functions for reading LTO sections. | |
2 | ||
3 | Copyright (C) 2009-2020 Free Software Foundation, Inc. | |
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" | |
25 | #include "backend.h" | |
26 | #include "rtl.h" | |
27 | #include "tree.h" | |
28 | #include "gimple.h" | |
29 | #include "cgraph.h" | |
30 | #include "lto-streamer.h" | |
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", | |
39 | "statics", | |
40 | "symtab", | |
41 | "refs", | |
42 | "asm", | |
43 | "jmpfuncs", | |
44 | "pureconst", | |
45 | "reference", | |
46 | "profile", | |
47 | "symbol_nodes", | |
48 | "opts", | |
49 | "cgraphopt", | |
50 | "inline", | |
51 | "ipcp_trans", | |
52 | "icf", | |
53 | "offload_table", | |
54 | "mode_table", | |
55 | "hsa", | |
56 | "lto", | |
57 | "ipa_sra" | |
58 | }; | |
59 | ||
60 | /* Hooks so that the ipa passes can call into the lto front end to get | |
61 | sections. */ | |
62 | ||
63 | static struct lto_file_decl_data ** file_decl_data; | |
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 | ||
72 | void | |
73 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
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 * | |
132 | lto_get_section_data (struct lto_file_decl_data *file_data, | |
133 | enum lto_section_type section_type, | |
134 | const char *name, int order, | |
135 | size_t *len, bool decompress) | |
136 | { | |
137 | const char *data = (get_section_f) (file_data, section_type, name, order, | |
138 | len); | |
139 | const size_t header_length = sizeof (struct lto_data_header); | |
140 | struct lto_data_header *header; | |
141 | struct lto_buffer buffer; | |
142 | struct lto_compression_stream *stream; | |
143 | lto_stats.section_size[section_type] += *len; | |
144 | ||
145 | if (data == NULL) | |
146 | return NULL; | |
147 | ||
148 | /* WPA->ltrans streams are not compressed with exception of function bodies | |
149 | and variable initializers that has been verbatim copied from earlier | |
150 | compilations. */ | |
151 | if ((!flag_ltrans || decompress) && section_type != LTO_section_lto) | |
152 | { | |
153 | /* Create a mapping header containing the underlying data and length, | |
154 | and prepend this to the uncompression buffer. The uncompressed data | |
155 | then follows, and a pointer to the start of the uncompressed data is | |
156 | returned. */ | |
157 | header = (struct lto_data_header *) xmalloc (header_length); | |
158 | header->data = data; | |
159 | header->len = *len; | |
160 | ||
161 | buffer.data = (char *) header; | |
162 | buffer.length = header_length; | |
163 | ||
164 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
165 | lto_uncompress_block (stream, data, *len); | |
166 | lto_end_uncompression (stream, | |
167 | file_data->lto_section_header.get_compression ()); | |
168 | ||
169 | *len = buffer.length - header_length; | |
170 | data = buffer.data + header_length; | |
171 | } | |
172 | ||
173 | return data; | |
174 | } | |
175 | ||
176 | /* Return a char pointer to the start of a data stream for an LTO pass. | |
177 | FILE_DATA indicates where to obtain the data. | |
178 | SECTION_TYPE is the type of information to be obtained. | |
179 | LEN is the size of the data returned. */ | |
180 | ||
181 | const char * | |
182 | lto_get_summary_section_data (struct lto_file_decl_data *file_data, | |
183 | enum lto_section_type section_type, size_t *len) | |
184 | { | |
185 | return lto_get_section_data (file_data, section_type, NULL, 0, len); | |
186 | } | |
187 | ||
188 | /* Get the section data without any header parsing or uncompression. */ | |
189 | ||
190 | const char * | |
191 | lto_get_raw_section_data (struct lto_file_decl_data *file_data, | |
192 | enum lto_section_type section_type, | |
193 | const char *name, int order, | |
194 | size_t *len) | |
195 | { | |
196 | return (get_section_f) (file_data, section_type, name, order, len); | |
197 | } | |
198 | ||
199 | /* Free the data found from the above call. The first three | |
200 | parameters are the same as above. DATA is the data to be freed and | |
201 | LEN is the length of that data. */ | |
202 | ||
203 | void | |
204 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
205 | enum lto_section_type section_type, | |
206 | const char *name, | |
207 | const char *data, | |
208 | size_t len, bool decompress) | |
209 | { | |
210 | const size_t header_length = sizeof (struct lto_data_header); | |
211 | const char *real_data = data - header_length; | |
212 | const struct lto_data_header *header | |
213 | = (const struct lto_data_header *) real_data; | |
214 | ||
215 | gcc_assert (free_section_f); | |
216 | ||
217 | if (flag_ltrans && !decompress) | |
218 | { | |
219 | (free_section_f) (file_data, section_type, name, data, len); | |
220 | return; | |
221 | } | |
222 | ||
223 | /* The underlying data address has been extracted from the mapping header. | |
224 | Free that, then free the allocated uncompression buffer. */ | |
225 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
226 | free (CONST_CAST (char *, real_data)); | |
227 | } | |
228 | ||
229 | /* Free data allocated by lto_get_raw_section_data. */ | |
230 | ||
231 | void | |
232 | lto_free_raw_section_data (struct lto_file_decl_data *file_data, | |
233 | enum lto_section_type section_type, | |
234 | const char *name, | |
235 | const char *data, | |
236 | size_t len) | |
237 | { | |
238 | (free_section_f) (file_data, section_type, name, data, len); | |
239 | } | |
240 | ||
241 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
242 | header and then return an input block pointing to the section. The | |
243 | raw pointer to the section is returned in DATAR and LEN. These are | |
244 | used to free the section. Return NULL if the section is not present. */ | |
245 | ||
246 | class lto_input_block * | |
247 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, | |
248 | enum lto_section_type section_type, | |
249 | const char **datar, size_t *len) | |
250 | { | |
251 | const char *data = lto_get_section_data (file_data, section_type, NULL, 0, | |
252 | len); | |
253 | const struct lto_simple_header * header | |
254 | = (const struct lto_simple_header *) data; | |
255 | ||
256 | int main_offset = sizeof (struct lto_simple_header); | |
257 | ||
258 | if (!data) | |
259 | return NULL; | |
260 | ||
261 | *datar = data; | |
262 | return new lto_input_block (data + main_offset, header->main_size, | |
263 | file_data->mode_table); | |
264 | } | |
265 | ||
266 | ||
267 | /* Close the section returned from a call to | |
268 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
269 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
270 | passed to that call and the DATA and LEN are what was returned from | |
271 | that call. */ | |
272 | ||
273 | void | |
274 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, | |
275 | enum lto_section_type section_type, | |
276 | class lto_input_block *ib, | |
277 | const char *data, size_t len) | |
278 | { | |
279 | delete ib; | |
280 | lto_free_section_data (file_data, section_type, NULL, data, len); | |
281 | } | |
282 | ||
283 | /*****************************************************************************/ | |
284 | /* Record renamings of static declarations */ | |
285 | /*****************************************************************************/ | |
286 | ||
287 | struct lto_renaming_slot | |
288 | { | |
289 | const char *old_name; | |
290 | const char *new_name; | |
291 | }; | |
292 | ||
293 | /* Returns a hash code for P. */ | |
294 | ||
295 | static hashval_t | |
296 | hash_name (const void *p) | |
297 | { | |
298 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
299 | return (hashval_t) htab_hash_string (ds->new_name); | |
300 | } | |
301 | ||
302 | /* Returns nonzero if P1 and P2 are equal. */ | |
303 | ||
304 | static int | |
305 | eq_name (const void *p1, const void *p2) | |
306 | { | |
307 | const struct lto_renaming_slot *s1 = | |
308 | (const struct lto_renaming_slot *) p1; | |
309 | const struct lto_renaming_slot *s2 = | |
310 | (const struct lto_renaming_slot *) p2; | |
311 | ||
312 | return strcmp (s1->new_name, s2->new_name) == 0; | |
313 | } | |
314 | ||
315 | /* Free a renaming table entry. */ | |
316 | ||
317 | static void | |
318 | renaming_slot_free (void *slot) | |
319 | { | |
320 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
321 | ||
322 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
323 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
324 | free ((void *) s); | |
325 | } | |
326 | ||
327 | /* Create an empty hash table for recording declaration renamings. */ | |
328 | ||
329 | htab_t | |
330 | lto_create_renaming_table (void) | |
331 | { | |
332 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
333 | } | |
334 | ||
335 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
336 | holds the renaming hash table to use. */ | |
337 | ||
338 | void | |
339 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
340 | const char *old_name, const char *new_name) | |
341 | { | |
342 | void **slot; | |
343 | struct lto_renaming_slot r_slot; | |
344 | ||
345 | r_slot.new_name = new_name; | |
346 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
347 | if (*slot == NULL) | |
348 | { | |
349 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
350 | new_slot->old_name = xstrdup (old_name); | |
351 | new_slot->new_name = xstrdup (new_name); | |
352 | *slot = new_slot; | |
353 | } | |
354 | else | |
355 | gcc_unreachable (); | |
356 | } | |
357 | ||
358 | ||
359 | /* Given a string NAME, return the string that it has been mapped to | |
360 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
361 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
362 | ||
363 | const char * | |
364 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
365 | const char *name) | |
366 | { | |
367 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
368 | struct lto_renaming_slot *slot; | |
369 | struct lto_renaming_slot r_slot; | |
370 | ||
371 | r_slot.new_name = name; | |
372 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
373 | if (slot) | |
374 | return slot->old_name; | |
375 | else | |
376 | return name; | |
377 | } | |
378 | ||
379 | /*****************************************************************************/ | |
380 | /* Input decl state object. */ | |
381 | /*****************************************************************************/ | |
382 | ||
383 | /* Return a newly created in-decl state object. */ | |
384 | ||
385 | struct lto_in_decl_state * | |
386 | lto_new_in_decl_state (void) | |
387 | { | |
388 | return ggc_cleared_alloc<lto_in_decl_state> (); | |
389 | } | |
390 | ||
391 | /* Delete STATE and its components. */ | |
392 | ||
393 | void | |
394 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
395 | { | |
396 | int i; | |
397 | ||
398 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
399 | vec_free (state->streams[i]); | |
400 | ggc_free (state); | |
401 | } | |
402 | ||
403 | /* Search the in-decl state of a function FUNC contained in the file | |
404 | associated with FILE_DATA. Return NULL if not found. */ | |
405 | ||
406 | struct lto_in_decl_state* | |
407 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
408 | tree func) | |
409 | { | |
410 | struct lto_in_decl_state temp; | |
411 | lto_in_decl_state **slot; | |
412 | ||
413 | temp.fn_decl = func; | |
414 | slot = file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
415 | return slot? *slot : NULL; | |
416 | } | |
417 | ||
418 | /* Free decl_states. */ | |
419 | ||
420 | void | |
421 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
422 | { | |
423 | int i; | |
424 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
425 | vec_free (state->streams[i]); | |
426 | ggc_free (state); | |
427 | } | |
428 | ||
429 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
430 | release trees needed by the NODE's body. */ | |
431 | ||
432 | void | |
433 | lto_free_function_in_decl_state_for_node (symtab_node *node) | |
434 | { | |
435 | struct lto_in_decl_state temp; | |
436 | lto_in_decl_state **slot; | |
437 | ||
438 | if (!node->lto_file_data) | |
439 | return; | |
440 | ||
441 | temp.fn_decl = node->decl; | |
442 | slot | |
443 | = node->lto_file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
444 | if (slot && *slot) | |
445 | { | |
446 | lto_free_function_in_decl_state (*slot); | |
447 | node->lto_file_data->function_decl_states->clear_slot (slot); | |
448 | } | |
449 | node->lto_file_data = NULL; | |
450 | } | |
451 | ||
452 | ||
453 | /* Report read pass end of the section. */ | |
454 | ||
455 | void | |
456 | lto_section_overrun (class lto_input_block *ib) | |
457 | { | |
458 | fatal_error (input_location, "bytecode stream: trying to read %d bytes " | |
459 | "after the end of the input buffer", ib->p - ib->len); | |
460 | } | |
461 | ||
462 | /* Report out of range value. */ | |
463 | ||
464 | void | |
465 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
466 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
467 | { | |
468 | fatal_error (input_location, | |
469 | "%s out of range: Range is %i to %i, value is %i", | |
470 | purpose, (int)min, (int)max, (int)val); | |
471 | } |