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7bfefa9d | 1 | /* Input functions for reading LTO sections. |
2 | ||
3aea1f79 | 3 | Copyright (C) 2009-2014 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" | |
25 | #include "tm.h" | |
7bfefa9d | 26 | #include "tree.h" |
94ea8568 | 27 | #include "predict.h" |
28 | #include "vec.h" | |
29 | #include "hashtab.h" | |
30 | #include "hash-set.h" | |
31 | #include "machmode.h" | |
32 | #include "hard-reg-set.h" | |
33 | #include "input.h" | |
34 | #include "function.h" | |
bc61cadb | 35 | #include "basic-block.h" |
36 | #include "tree-ssa-alias.h" | |
37 | #include "internal-fn.h" | |
38 | #include "gimple-expr.h" | |
39 | #include "is-a.h" | |
b23fb4cb | 40 | #include "gimple.h" |
7bfefa9d | 41 | #include "expr.h" |
42 | #include "flags.h" | |
43 | #include "params.h" | |
852f689e | 44 | #include "diagnostic-core.h" |
7bfefa9d | 45 | #include "except.h" |
7bfefa9d | 46 | #include "timevar.h" |
1140c305 | 47 | #include "hash-map.h" |
48 | #include "plugin-api.h" | |
49 | #include "ipa-ref.h" | |
50 | #include "cgraph.h" | |
7bfefa9d | 51 | #include "lto-streamer.h" |
52 | #include "lto-compress.h" | |
53 | ||
54 | /* Section names. These must correspond to the values of | |
55 | enum lto_section_type. */ | |
56 | const char *lto_section_name[LTO_N_SECTION_TYPES] = | |
57 | { | |
58 | "decls", | |
59 | "function_body", | |
2e295599 | 60 | "statics", |
02b699d5 | 61 | "symtab", |
8d810329 | 62 | "refs", |
65d1b157 | 63 | "asm", |
2e295599 | 64 | "jmpfuncs", |
65 | "pureconst", | |
66 | "reference", | |
9e179a64 | 67 | "profile", |
341eb035 | 68 | "symbol_nodes", |
1bf41320 | 69 | "opts", |
c7b2cc59 | 70 | "cgraphopt", |
803a7988 | 71 | "inline", |
52200d03 | 72 | "ipcp_trans", |
dccabdd1 | 73 | "icf", |
74 | "offload_table" | |
7bfefa9d | 75 | }; |
76 | ||
7bfefa9d | 77 | |
7bfefa9d | 78 | /* Hooks so that the ipa passes can call into the lto front end to get |
79 | sections. */ | |
80 | ||
48e1416a | 81 | static struct lto_file_decl_data ** file_decl_data; |
7bfefa9d | 82 | static lto_get_section_data_f* get_section_f; |
83 | static lto_free_section_data_f* free_section_f; | |
84 | ||
85 | ||
86 | /* This is called from the lto front end to set up the hooks that are | |
87 | used by the ipa passes to get the data that they will | |
88 | deserialize. */ | |
89 | ||
48e1416a | 90 | void |
91 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
7bfefa9d | 92 | lto_get_section_data_f* get_f, |
93 | lto_free_section_data_f* free_f) | |
94 | { | |
95 | file_decl_data = data; | |
96 | get_section_f = get_f; | |
97 | free_section_f = free_f; | |
98 | } | |
99 | ||
100 | ||
101 | /* Return an array of file decl datas for all of the files passed to | |
102 | this compilation. */ | |
103 | ||
104 | struct lto_file_decl_data ** | |
105 | lto_get_file_decl_data (void) | |
106 | { | |
107 | gcc_assert (file_decl_data); | |
108 | return file_decl_data; | |
109 | } | |
110 | ||
111 | /* Buffer structure for accumulating data from compression callbacks. */ | |
112 | ||
113 | struct lto_buffer | |
114 | { | |
115 | char *data; | |
116 | size_t length; | |
117 | }; | |
118 | ||
119 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
120 | to by OPAQUE. */ | |
121 | ||
122 | static void | |
123 | lto_append_data (const char *data, unsigned length, void *opaque) | |
124 | { | |
125 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
126 | ||
127 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
128 | memcpy (buffer->data + buffer->length, data, length); | |
129 | buffer->length += length; | |
130 | } | |
131 | ||
132 | /* Header placed in returned uncompressed data streams. Allows the | |
133 | uncompressed allocated data to be mapped back to the underlying | |
134 | compressed data for use with free_section_f. */ | |
135 | ||
136 | struct lto_data_header | |
137 | { | |
138 | const char *data; | |
139 | size_t len; | |
140 | }; | |
141 | ||
142 | /* Return a char pointer to the start of a data stream for an LTO pass | |
143 | or function. FILE_DATA indicates where to obtain the data. | |
144 | SECTION_TYPE is the type of information to be obtained. NAME is | |
145 | the name of the function and is only used when finding a function | |
146 | body; otherwise it is NULL. LEN is the size of the data | |
147 | returned. */ | |
148 | ||
149 | const char * | |
48e1416a | 150 | lto_get_section_data (struct lto_file_decl_data *file_data, |
7bfefa9d | 151 | enum lto_section_type section_type, |
48e1416a | 152 | const char *name, |
7bfefa9d | 153 | size_t *len) |
154 | { | |
155 | const char *data = (get_section_f) (file_data, section_type, name, len); | |
156 | const size_t header_length = sizeof (struct lto_data_header); | |
157 | struct lto_data_header *header; | |
158 | struct lto_buffer buffer; | |
159 | struct lto_compression_stream *stream; | |
160 | lto_stats.section_size[section_type] += *len; | |
161 | ||
162 | if (data == NULL) | |
163 | return NULL; | |
164 | ||
165 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
166 | suppress uncompression if flag_ltrans. */ | |
baa4a2c6 | 167 | if (!flag_ltrans) |
168 | { | |
169 | /* Create a mapping header containing the underlying data and length, | |
170 | and prepend this to the uncompression buffer. The uncompressed data | |
171 | then follows, and a pointer to the start of the uncompressed data is | |
172 | returned. */ | |
173 | header = (struct lto_data_header *) xmalloc (header_length); | |
174 | header->data = data; | |
175 | header->len = *len; | |
176 | ||
177 | buffer.data = (char *) header; | |
178 | buffer.length = header_length; | |
179 | ||
180 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
181 | lto_uncompress_block (stream, data, *len); | |
182 | lto_end_uncompression (stream); | |
183 | ||
184 | *len = buffer.length - header_length; | |
185 | data = buffer.data + header_length; | |
186 | } | |
187 | ||
4692b23a | 188 | lto_check_version (((const lto_header *)data)->major_version, |
189 | ((const lto_header *)data)->minor_version); | |
baa4a2c6 | 190 | return data; |
7bfefa9d | 191 | } |
192 | ||
193 | ||
194 | /* Free the data found from the above call. The first three | |
195 | parameters are the same as above. DATA is the data to be freed and | |
196 | LEN is the length of that data. */ | |
197 | ||
48e1416a | 198 | void |
199 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
7bfefa9d | 200 | enum lto_section_type section_type, |
201 | const char *name, | |
202 | const char *data, | |
203 | size_t len) | |
204 | { | |
205 | const size_t header_length = sizeof (struct lto_data_header); | |
206 | const char *real_data = data - header_length; | |
207 | const struct lto_data_header *header | |
208 | = (const struct lto_data_header *) real_data; | |
209 | ||
210 | gcc_assert (free_section_f); | |
211 | ||
212 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
213 | suppress uncompression mapping if flag_ltrans. */ | |
214 | if (flag_ltrans) | |
215 | { | |
216 | (free_section_f) (file_data, section_type, name, data, len); | |
217 | return; | |
218 | } | |
219 | ||
220 | /* The underlying data address has been extracted from the mapping header. | |
221 | Free that, then free the allocated uncompression buffer. */ | |
222 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
223 | free (CONST_CAST (char *, real_data)); | |
224 | } | |
225 | ||
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 | ||
232 | struct 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; |
472ca566 | 247 | return new lto_input_block (data + main_offset, header->main_size); |
7bfefa9d | 248 | } |
249 | ||
250 | ||
251 | /* Close the section returned from a call to | |
252 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
253 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
254 | passed to that call and the DATA and LEN are what was returned from | |
255 | that call. */ | |
256 | ||
257 | void | |
48e1416a | 258 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 259 | enum lto_section_type section_type, |
260 | struct lto_input_block *ib, | |
261 | const char *data, size_t len) | |
262 | { | |
472ca566 | 263 | delete ib; |
7bfefa9d | 264 | lto_free_section_data (file_data, section_type, NULL, data, len); |
265 | } | |
266 | ||
267 | /*****************************************************************************/ | |
268 | /* Record renamings of static declarations */ | |
269 | /*****************************************************************************/ | |
270 | ||
271 | struct lto_renaming_slot | |
272 | { | |
273 | const char *old_name; | |
274 | const char *new_name; | |
275 | }; | |
276 | ||
277 | /* Returns a hash code for P. */ | |
278 | ||
279 | static hashval_t | |
280 | hash_name (const void *p) | |
281 | { | |
282 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
283 | return (hashval_t) htab_hash_string (ds->new_name); | |
284 | } | |
285 | ||
286 | /* Returns nonzero if P1 and P2 are equal. */ | |
287 | ||
288 | static int | |
289 | eq_name (const void *p1, const void *p2) | |
290 | { | |
291 | const struct lto_renaming_slot *s1 = | |
292 | (const struct lto_renaming_slot *) p1; | |
293 | const struct lto_renaming_slot *s2 = | |
294 | (const struct lto_renaming_slot *) p2; | |
295 | ||
296 | return strcmp (s1->new_name, s2->new_name) == 0; | |
297 | } | |
298 | ||
299 | /* Free a renaming table entry. */ | |
300 | ||
301 | static void | |
302 | renaming_slot_free (void *slot) | |
303 | { | |
304 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
305 | ||
306 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
307 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
308 | free ((void *) s); | |
309 | } | |
310 | ||
311 | /* Create an empty hash table for recording declaration renamings. */ | |
312 | ||
313 | htab_t | |
314 | lto_create_renaming_table (void) | |
315 | { | |
316 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
317 | } | |
318 | ||
319 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
320 | holds the renaming hash table to use. */ | |
321 | ||
322 | void | |
323 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
324 | const char *old_name, const char *new_name) | |
325 | { | |
326 | void **slot; | |
327 | struct lto_renaming_slot r_slot; | |
328 | ||
329 | r_slot.new_name = new_name; | |
330 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
331 | if (*slot == NULL) | |
332 | { | |
333 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
334 | new_slot->old_name = xstrdup (old_name); | |
335 | new_slot->new_name = xstrdup (new_name); | |
336 | *slot = new_slot; | |
337 | } | |
338 | else | |
339 | gcc_unreachable (); | |
340 | } | |
341 | ||
342 | ||
343 | /* Given a string NAME, return the string that it has been mapped to | |
344 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
345 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
346 | ||
347 | const char * | |
348 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
349 | const char *name) | |
350 | { | |
351 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
352 | struct lto_renaming_slot *slot; | |
353 | struct lto_renaming_slot r_slot; | |
354 | ||
355 | r_slot.new_name = name; | |
356 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
357 | if (slot) | |
358 | return slot->old_name; | |
359 | else | |
360 | return name; | |
361 | } | |
362 | ||
363 | /*****************************************************************************/ | |
364 | /* Input decl state object. */ | |
365 | /*****************************************************************************/ | |
366 | ||
367 | /* Return a newly created in-decl state object. */ | |
368 | ||
369 | struct lto_in_decl_state * | |
370 | lto_new_in_decl_state (void) | |
371 | { | |
25a27413 | 372 | return ggc_cleared_alloc<lto_in_decl_state> (); |
7bfefa9d | 373 | } |
374 | ||
375 | /* Delete STATE and its components. */ | |
376 | ||
377 | void | |
378 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
379 | { | |
380 | int i; | |
381 | ||
382 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 383 | vec_free (state->streams[i]); |
57305941 | 384 | ggc_free (state); |
7bfefa9d | 385 | } |
386 | ||
387 | /* Hashtable helpers. lto_in_decl_states are hash by their function decls. */ | |
388 | ||
389 | hashval_t | |
390 | lto_hash_in_decl_state (const void *p) | |
391 | { | |
392 | const struct lto_in_decl_state *state = (const struct lto_in_decl_state *) p; | |
393 | return htab_hash_pointer (state->fn_decl); | |
394 | } | |
395 | ||
396 | /* Return true if the fn_decl field of the lto_in_decl_state pointed to by | |
397 | P1 equals to the function decl P2. */ | |
398 | ||
399 | int | |
400 | lto_eq_in_decl_state (const void *p1, const void *p2) | |
401 | { | |
402 | const struct lto_in_decl_state *state1 = | |
403 | (const struct lto_in_decl_state *) p1; | |
404 | const struct lto_in_decl_state *state2 = | |
405 | (const struct lto_in_decl_state *) p2; | |
406 | return state1->fn_decl == state2->fn_decl; | |
407 | } | |
408 | ||
409 | ||
410 | /* Search the in-decl state of a function FUNC contained in the file | |
411 | associated with FILE_DATA. Return NULL if not found. */ | |
412 | ||
413 | struct lto_in_decl_state* | |
414 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
415 | tree func) | |
416 | { | |
417 | struct lto_in_decl_state temp; | |
418 | void **slot; | |
419 | ||
420 | temp.fn_decl = func; | |
421 | slot = htab_find_slot (file_data->function_decl_states, &temp, NO_INSERT); | |
422 | return slot? ((struct lto_in_decl_state*) *slot) : NULL; | |
423 | } | |
673ca05f | 424 | |
5f74a074 | 425 | /* Free decl_states. */ |
426 | ||
427 | void | |
428 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
429 | { | |
430 | int i; | |
431 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
5ecbd52e | 432 | vec_free (state->streams[i]); |
5f74a074 | 433 | ggc_free (state); |
434 | } | |
435 | ||
436 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
437 | release trees needed by the NODE's body. */ | |
438 | ||
439 | void | |
452659af | 440 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
5f74a074 | 441 | { |
442 | struct lto_in_decl_state temp; | |
443 | void **slot; | |
444 | ||
02774f2d | 445 | if (!node->lto_file_data) |
5f74a074 | 446 | return; |
447 | ||
02774f2d | 448 | temp.fn_decl = node->decl; |
449 | slot = htab_find_slot (node->lto_file_data->function_decl_states, | |
5f74a074 | 450 | &temp, NO_INSERT); |
451 | if (slot && *slot) | |
452 | { | |
453 | lto_free_function_in_decl_state ((struct lto_in_decl_state*) *slot); | |
02774f2d | 454 | htab_clear_slot (node->lto_file_data->function_decl_states, |
5f74a074 | 455 | slot); |
456 | } | |
02774f2d | 457 | node->lto_file_data = NULL; |
5f74a074 | 458 | } |
459 | ||
673ca05f | 460 | |
461 | /* Report read pass end of the section. */ | |
462 | ||
463 | void | |
464 | lto_section_overrun (struct lto_input_block *ib) | |
465 | { | |
5f8d4adf | 466 | fatal_error ("bytecode stream: trying to read %d bytes " |
467 | "after the end of the input buffer", ib->p - ib->len); | |
468 | } | |
469 | ||
470 | /* Report out of range value. */ | |
471 | ||
472 | void | |
473 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
474 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
475 | { | |
476 | fatal_error ("%s out of range: Range is %i to %i, value is %i", | |
477 | purpose, (int)min, (int)max, (int)val); | |
673ca05f | 478 | } |