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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", |
96a0ca19 | 55 | "hsa", |
56 | "lto" | |
7bfefa9d | 57 | }; |
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. */ | |
96a0ca19 | 149 | if ((!flag_ltrans || decompress) && section_type != LTO_section_lto) |
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); | |
88a70657 | 164 | lto_end_uncompression (stream, |
165 | file_data->lto_section_header.get_compression ()); | |
baa4a2c6 | 166 | |
167 | *len = buffer.length - header_length; | |
168 | data = buffer.data + header_length; | |
169 | } | |
170 | ||
baa4a2c6 | 171 | return data; |
7bfefa9d | 172 | } |
173 | ||
6cbd82a6 | 174 | /* Get the section data without any header parsing or uncompression. */ |
175 | ||
176 | const char * | |
177 | lto_get_raw_section_data (struct lto_file_decl_data *file_data, | |
178 | enum lto_section_type section_type, | |
179 | const char *name, | |
180 | size_t *len) | |
181 | { | |
182 | return (get_section_f) (file_data, section_type, name, len); | |
183 | } | |
7bfefa9d | 184 | |
185 | /* Free the data found from the above call. The first three | |
186 | parameters are the same as above. DATA is the data to be freed and | |
187 | LEN is the length of that data. */ | |
188 | ||
48e1416a | 189 | void |
190 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
7bfefa9d | 191 | enum lto_section_type section_type, |
192 | const char *name, | |
193 | const char *data, | |
6cbd82a6 | 194 | size_t len, bool decompress) |
7bfefa9d | 195 | { |
196 | const size_t header_length = sizeof (struct lto_data_header); | |
197 | const char *real_data = data - header_length; | |
198 | const struct lto_data_header *header | |
199 | = (const struct lto_data_header *) real_data; | |
200 | ||
201 | gcc_assert (free_section_f); | |
202 | ||
6cbd82a6 | 203 | if (flag_ltrans && !decompress) |
7bfefa9d | 204 | { |
205 | (free_section_f) (file_data, section_type, name, data, len); | |
206 | return; | |
207 | } | |
208 | ||
209 | /* The underlying data address has been extracted from the mapping header. | |
210 | Free that, then free the allocated uncompression buffer. */ | |
211 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
212 | free (CONST_CAST (char *, real_data)); | |
213 | } | |
214 | ||
6cbd82a6 | 215 | /* Free data allocated by lto_get_raw_section_data. */ |
216 | ||
217 | void | |
218 | lto_free_raw_section_data (struct lto_file_decl_data *file_data, | |
219 | enum lto_section_type section_type, | |
220 | const char *name, | |
221 | const char *data, | |
222 | size_t len) | |
223 | { | |
224 | (free_section_f) (file_data, section_type, name, data, len); | |
225 | } | |
7bfefa9d | 226 | |
227 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
228 | header and then return an input block pointing to the section. The | |
229 | raw pointer to the section is returned in DATAR and LEN. These are | |
230 | used to free the section. Return NULL if the section is not present. */ | |
231 | ||
2e966e2a | 232 | class lto_input_block * |
48e1416a | 233 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 234 | enum lto_section_type section_type, |
235 | const char **datar, size_t *len) | |
236 | { | |
237 | const char *data = lto_get_section_data (file_data, section_type, NULL, len); | |
48e1416a | 238 | const struct lto_simple_header * header |
7bfefa9d | 239 | = (const struct lto_simple_header *) data; |
240 | ||
949e5786 | 241 | int main_offset = sizeof (struct lto_simple_header); |
7bfefa9d | 242 | |
243 | if (!data) | |
244 | return NULL; | |
245 | ||
7bfefa9d | 246 | *datar = data; |
2e971afd | 247 | return new lto_input_block (data + main_offset, header->main_size, |
248 | file_data->mode_table); | |
7bfefa9d | 249 | } |
250 | ||
251 | ||
252 | /* Close the section returned from a call to | |
253 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
254 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
255 | passed to that call and the DATA and LEN are what was returned from | |
256 | that call. */ | |
257 | ||
258 | void | |
48e1416a | 259 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 260 | enum lto_section_type section_type, |
2e966e2a | 261 | class lto_input_block *ib, |
7bfefa9d | 262 | const char *data, size_t len) |
263 | { | |
472ca566 | 264 | delete ib; |
7bfefa9d | 265 | lto_free_section_data (file_data, section_type, NULL, data, len); |
266 | } | |
267 | ||
268 | /*****************************************************************************/ | |
269 | /* Record renamings of static declarations */ | |
270 | /*****************************************************************************/ | |
271 | ||
272 | struct lto_renaming_slot | |
273 | { | |
274 | const char *old_name; | |
275 | const char *new_name; | |
276 | }; | |
277 | ||
278 | /* Returns a hash code for P. */ | |
279 | ||
280 | static hashval_t | |
281 | hash_name (const void *p) | |
282 | { | |
283 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
284 | return (hashval_t) htab_hash_string (ds->new_name); | |
285 | } | |
286 | ||
287 | /* Returns nonzero if P1 and P2 are equal. */ | |
288 | ||
289 | static int | |
290 | eq_name (const void *p1, const void *p2) | |
291 | { | |
292 | const struct lto_renaming_slot *s1 = | |
293 | (const struct lto_renaming_slot *) p1; | |
294 | const struct lto_renaming_slot *s2 = | |
295 | (const struct lto_renaming_slot *) p2; | |
296 | ||
297 | return strcmp (s1->new_name, s2->new_name) == 0; | |
298 | } | |
299 | ||
300 | /* Free a renaming table entry. */ | |
301 | ||
302 | static void | |
303 | renaming_slot_free (void *slot) | |
304 | { | |
305 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
306 | ||
307 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
308 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
309 | free ((void *) s); | |
310 | } | |
311 | ||
312 | /* Create an empty hash table for recording declaration renamings. */ | |
313 | ||
314 | htab_t | |
315 | lto_create_renaming_table (void) | |
316 | { | |
317 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
318 | } | |
319 | ||
320 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
321 | holds the renaming hash table to use. */ | |
322 | ||
323 | void | |
324 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
325 | const char *old_name, const char *new_name) | |
326 | { | |
327 | void **slot; | |
328 | struct lto_renaming_slot r_slot; | |
329 | ||
330 | r_slot.new_name = new_name; | |
331 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
332 | if (*slot == NULL) | |
333 | { | |
334 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
335 | new_slot->old_name = xstrdup (old_name); | |
336 | new_slot->new_name = xstrdup (new_name); | |
337 | *slot = new_slot; | |
338 | } | |
339 | else | |
340 | gcc_unreachable (); | |
341 | } | |
342 | ||
343 | ||
344 | /* Given a string NAME, return the string that it has been mapped to | |
345 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
346 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
347 | ||
348 | const char * | |
349 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
350 | const char *name) | |
351 | { | |
352 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
353 | struct lto_renaming_slot *slot; | |
354 | struct lto_renaming_slot r_slot; | |
355 | ||
356 | r_slot.new_name = name; | |
357 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
358 | if (slot) | |
359 | return slot->old_name; | |
360 | else | |
361 | return name; | |
362 | } | |
363 | ||
364 | /*****************************************************************************/ | |
365 | /* Input decl state object. */ | |
366 | /*****************************************************************************/ | |
367 | ||
368 | /* Return a newly created in-decl state object. */ | |
369 | ||
370 | struct lto_in_decl_state * | |
371 | lto_new_in_decl_state (void) | |
372 | { | |
25a27413 | 373 | return ggc_cleared_alloc<lto_in_decl_state> (); |
7bfefa9d | 374 | } |
375 | ||
376 | /* Delete STATE and its components. */ | |
377 | ||
378 | void | |
379 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
380 | { | |
381 | int i; | |
382 | ||
383 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 384 | vec_free (state->streams[i]); |
57305941 | 385 | ggc_free (state); |
7bfefa9d | 386 | } |
387 | ||
7bfefa9d | 388 | /* Search the in-decl state of a function FUNC contained in the file |
389 | associated with FILE_DATA. Return NULL if not found. */ | |
390 | ||
391 | struct lto_in_decl_state* | |
392 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
393 | tree func) | |
394 | { | |
395 | struct lto_in_decl_state temp; | |
9f9f871f | 396 | lto_in_decl_state **slot; |
7bfefa9d | 397 | |
398 | temp.fn_decl = func; | |
9f9f871f | 399 | slot = file_data->function_decl_states->find_slot (&temp, NO_INSERT); |
400 | return slot? *slot : NULL; | |
7bfefa9d | 401 | } |
673ca05f | 402 | |
5f74a074 | 403 | /* Free decl_states. */ |
404 | ||
405 | void | |
406 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
407 | { | |
408 | int i; | |
409 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 410 | vec_free (state->streams[i]); |
5f74a074 | 411 | ggc_free (state); |
412 | } | |
413 | ||
414 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
415 | release trees needed by the NODE's body. */ | |
416 | ||
417 | void | |
452659af | 418 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
5f74a074 | 419 | { |
420 | struct lto_in_decl_state temp; | |
9f9f871f | 421 | lto_in_decl_state **slot; |
5f74a074 | 422 | |
02774f2d | 423 | if (!node->lto_file_data) |
5f74a074 | 424 | return; |
425 | ||
02774f2d | 426 | temp.fn_decl = node->decl; |
9f9f871f | 427 | slot |
428 | = node->lto_file_data->function_decl_states->find_slot (&temp, NO_INSERT); | |
5f74a074 | 429 | if (slot && *slot) |
430 | { | |
9f9f871f | 431 | lto_free_function_in_decl_state (*slot); |
432 | node->lto_file_data->function_decl_states->clear_slot (slot); | |
5f74a074 | 433 | } |
02774f2d | 434 | node->lto_file_data = NULL; |
5f74a074 | 435 | } |
436 | ||
673ca05f | 437 | |
438 | /* Report read pass end of the section. */ | |
439 | ||
440 | void | |
2e966e2a | 441 | lto_section_overrun (class lto_input_block *ib) |
673ca05f | 442 | { |
c05be867 | 443 | fatal_error (input_location, "bytecode stream: trying to read %d bytes " |
5f8d4adf | 444 | "after the end of the input buffer", ib->p - ib->len); |
445 | } | |
446 | ||
447 | /* Report out of range value. */ | |
448 | ||
449 | void | |
450 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
451 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
452 | { | |
c05be867 | 453 | fatal_error (input_location, |
454 | "%s out of range: Range is %i to %i, value is %i", | |
5f8d4adf | 455 | purpose, (int)min, (int)max, (int)val); |
673ca05f | 456 | } |