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d7f09764 DN |
1 | /* Input functions for reading LTO sections. |
2 | ||
23a5b65a | 3 | Copyright (C) 2009-2014 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" | |
25 | #include "tm.h" | |
d7f09764 | 26 | #include "tree.h" |
2fb9a547 AM |
27 | #include "basic-block.h" |
28 | #include "tree-ssa-alias.h" | |
29 | #include "internal-fn.h" | |
30 | #include "gimple-expr.h" | |
31 | #include "is-a.h" | |
8e9055ae | 32 | #include "gimple.h" |
d7f09764 DN |
33 | #include "expr.h" |
34 | #include "flags.h" | |
35 | #include "params.h" | |
36 | #include "input.h" | |
d7f09764 | 37 | #include "hashtab.h" |
83685514 AM |
38 | #include "hash-set.h" |
39 | #include "vec.h" | |
40 | #include "machmode.h" | |
41 | #include "hard-reg-set.h" | |
d7f09764 | 42 | #include "function.h" |
1da2ed5f | 43 | #include "diagnostic-core.h" |
d7f09764 | 44 | #include "except.h" |
d7f09764 | 45 | #include "timevar.h" |
d7f09764 DN |
46 | #include "lto-streamer.h" |
47 | #include "lto-compress.h" | |
48 | ||
49 | /* Section names. These must correspond to the values of | |
50 | enum lto_section_type. */ | |
51 | const char *lto_section_name[LTO_N_SECTION_TYPES] = | |
52 | { | |
53 | "decls", | |
54 | "function_body", | |
0b394350 | 55 | "statics", |
ab96cc5b | 56 | "symtab", |
369451ec | 57 | "refs", |
49f836ba | 58 | "asm", |
0b394350 AK |
59 | "jmpfuncs", |
60 | "pureconst", | |
61 | "reference", | |
0208f7da | 62 | "profile", |
15d0e7a0 | 63 | "symbol_nodes", |
922f15c2 | 64 | "opts", |
10a5dd5d | 65 | "cgraphopt", |
2c9561b5 | 66 | "inline", |
b84d4347 ML |
67 | "ipcp_trans", |
68 | "icf" | |
d7f09764 DN |
69 | }; |
70 | ||
d7f09764 | 71 | |
d7f09764 DN |
72 | /* Hooks so that the ipa passes can call into the lto front end to get |
73 | sections. */ | |
74 | ||
b8698a0f | 75 | static struct lto_file_decl_data ** file_decl_data; |
d7f09764 DN |
76 | static lto_get_section_data_f* get_section_f; |
77 | static lto_free_section_data_f* free_section_f; | |
78 | ||
79 | ||
80 | /* This is called from the lto front end to set up the hooks that are | |
81 | used by the ipa passes to get the data that they will | |
82 | deserialize. */ | |
83 | ||
b8698a0f L |
84 | void |
85 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
d7f09764 DN |
86 | lto_get_section_data_f* get_f, |
87 | lto_free_section_data_f* free_f) | |
88 | { | |
89 | file_decl_data = data; | |
90 | get_section_f = get_f; | |
91 | free_section_f = free_f; | |
92 | } | |
93 | ||
94 | ||
95 | /* Return an array of file decl datas for all of the files passed to | |
96 | this compilation. */ | |
97 | ||
98 | struct lto_file_decl_data ** | |
99 | lto_get_file_decl_data (void) | |
100 | { | |
101 | gcc_assert (file_decl_data); | |
102 | return file_decl_data; | |
103 | } | |
104 | ||
105 | /* Buffer structure for accumulating data from compression callbacks. */ | |
106 | ||
107 | struct lto_buffer | |
108 | { | |
109 | char *data; | |
110 | size_t length; | |
111 | }; | |
112 | ||
113 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
114 | to by OPAQUE. */ | |
115 | ||
116 | static void | |
117 | lto_append_data (const char *data, unsigned length, void *opaque) | |
118 | { | |
119 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
120 | ||
121 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
122 | memcpy (buffer->data + buffer->length, data, length); | |
123 | buffer->length += length; | |
124 | } | |
125 | ||
126 | /* Header placed in returned uncompressed data streams. Allows the | |
127 | uncompressed allocated data to be mapped back to the underlying | |
128 | compressed data for use with free_section_f. */ | |
129 | ||
130 | struct lto_data_header | |
131 | { | |
132 | const char *data; | |
133 | size_t len; | |
134 | }; | |
135 | ||
136 | /* Return a char pointer to the start of a data stream for an LTO pass | |
137 | or function. FILE_DATA indicates where to obtain the data. | |
138 | SECTION_TYPE is the type of information to be obtained. NAME is | |
139 | the name of the function and is only used when finding a function | |
140 | body; otherwise it is NULL. LEN is the size of the data | |
141 | returned. */ | |
142 | ||
143 | const char * | |
b8698a0f | 144 | lto_get_section_data (struct lto_file_decl_data *file_data, |
d7f09764 | 145 | enum lto_section_type section_type, |
b8698a0f | 146 | const char *name, |
d7f09764 DN |
147 | size_t *len) |
148 | { | |
149 | const char *data = (get_section_f) (file_data, section_type, name, len); | |
150 | const size_t header_length = sizeof (struct lto_data_header); | |
151 | struct lto_data_header *header; | |
152 | struct lto_buffer buffer; | |
153 | struct lto_compression_stream *stream; | |
154 | lto_stats.section_size[section_type] += *len; | |
155 | ||
156 | if (data == NULL) | |
157 | return NULL; | |
158 | ||
159 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
160 | suppress uncompression if flag_ltrans. */ | |
91856735 RB |
161 | if (!flag_ltrans) |
162 | { | |
163 | /* Create a mapping header containing the underlying data and length, | |
164 | and prepend this to the uncompression buffer. The uncompressed data | |
165 | then follows, and a pointer to the start of the uncompressed data is | |
166 | returned. */ | |
167 | header = (struct lto_data_header *) xmalloc (header_length); | |
168 | header->data = data; | |
169 | header->len = *len; | |
170 | ||
171 | buffer.data = (char *) header; | |
172 | buffer.length = header_length; | |
173 | ||
174 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
175 | lto_uncompress_block (stream, data, *len); | |
176 | lto_end_uncompression (stream); | |
177 | ||
178 | *len = buffer.length - header_length; | |
179 | data = buffer.data + header_length; | |
180 | } | |
181 | ||
3c24e842 RB |
182 | lto_check_version (((const lto_header *)data)->major_version, |
183 | ((const lto_header *)data)->minor_version); | |
91856735 | 184 | return data; |
d7f09764 DN |
185 | } |
186 | ||
187 | ||
188 | /* Free the data found from the above call. The first three | |
189 | parameters are the same as above. DATA is the data to be freed and | |
190 | LEN is the length of that data. */ | |
191 | ||
b8698a0f L |
192 | void |
193 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
d7f09764 DN |
194 | enum lto_section_type section_type, |
195 | const char *name, | |
196 | const char *data, | |
197 | size_t len) | |
198 | { | |
199 | const size_t header_length = sizeof (struct lto_data_header); | |
200 | const char *real_data = data - header_length; | |
201 | const struct lto_data_header *header | |
202 | = (const struct lto_data_header *) real_data; | |
203 | ||
204 | gcc_assert (free_section_f); | |
205 | ||
206 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
207 | suppress uncompression mapping if flag_ltrans. */ | |
208 | if (flag_ltrans) | |
209 | { | |
210 | (free_section_f) (file_data, section_type, name, data, len); | |
211 | return; | |
212 | } | |
213 | ||
214 | /* The underlying data address has been extracted from the mapping header. | |
215 | Free that, then free the allocated uncompression buffer. */ | |
216 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
217 | free (CONST_CAST (char *, real_data)); | |
218 | } | |
219 | ||
220 | ||
221 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
222 | header and then return an input block pointing to the section. The | |
223 | raw pointer to the section is returned in DATAR and LEN. These are | |
224 | used to free the section. Return NULL if the section is not present. */ | |
225 | ||
226 | struct lto_input_block * | |
b8698a0f | 227 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 DN |
228 | enum lto_section_type section_type, |
229 | const char **datar, size_t *len) | |
230 | { | |
231 | const char *data = lto_get_section_data (file_data, section_type, NULL, len); | |
b8698a0f | 232 | const struct lto_simple_header * header |
d7f09764 DN |
233 | = (const struct lto_simple_header *) data; |
234 | ||
4ad9a9de | 235 | int main_offset = sizeof (struct lto_simple_header); |
d7f09764 DN |
236 | |
237 | if (!data) | |
238 | return NULL; | |
239 | ||
d7f09764 | 240 | *datar = data; |
207c68cd | 241 | return new lto_input_block (data + main_offset, header->main_size); |
d7f09764 DN |
242 | } |
243 | ||
244 | ||
245 | /* Close the section returned from a call to | |
246 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
247 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
248 | passed to that call and the DATA and LEN are what was returned from | |
249 | that call. */ | |
250 | ||
251 | void | |
b8698a0f | 252 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
d7f09764 DN |
253 | enum lto_section_type section_type, |
254 | struct lto_input_block *ib, | |
255 | const char *data, size_t len) | |
256 | { | |
207c68cd | 257 | delete ib; |
d7f09764 DN |
258 | lto_free_section_data (file_data, section_type, NULL, data, len); |
259 | } | |
260 | ||
261 | /*****************************************************************************/ | |
262 | /* Record renamings of static declarations */ | |
263 | /*****************************************************************************/ | |
264 | ||
265 | struct lto_renaming_slot | |
266 | { | |
267 | const char *old_name; | |
268 | const char *new_name; | |
269 | }; | |
270 | ||
271 | /* Returns a hash code for P. */ | |
272 | ||
273 | static hashval_t | |
274 | hash_name (const void *p) | |
275 | { | |
276 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
277 | return (hashval_t) htab_hash_string (ds->new_name); | |
278 | } | |
279 | ||
280 | /* Returns nonzero if P1 and P2 are equal. */ | |
281 | ||
282 | static int | |
283 | eq_name (const void *p1, const void *p2) | |
284 | { | |
285 | const struct lto_renaming_slot *s1 = | |
286 | (const struct lto_renaming_slot *) p1; | |
287 | const struct lto_renaming_slot *s2 = | |
288 | (const struct lto_renaming_slot *) p2; | |
289 | ||
290 | return strcmp (s1->new_name, s2->new_name) == 0; | |
291 | } | |
292 | ||
293 | /* Free a renaming table entry. */ | |
294 | ||
295 | static void | |
296 | renaming_slot_free (void *slot) | |
297 | { | |
298 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
299 | ||
300 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
301 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
302 | free ((void *) s); | |
303 | } | |
304 | ||
305 | /* Create an empty hash table for recording declaration renamings. */ | |
306 | ||
307 | htab_t | |
308 | lto_create_renaming_table (void) | |
309 | { | |
310 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
311 | } | |
312 | ||
313 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
314 | holds the renaming hash table to use. */ | |
315 | ||
316 | void | |
317 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
318 | const char *old_name, const char *new_name) | |
319 | { | |
320 | void **slot; | |
321 | struct lto_renaming_slot r_slot; | |
322 | ||
323 | r_slot.new_name = new_name; | |
324 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
325 | if (*slot == NULL) | |
326 | { | |
327 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
328 | new_slot->old_name = xstrdup (old_name); | |
329 | new_slot->new_name = xstrdup (new_name); | |
330 | *slot = new_slot; | |
331 | } | |
332 | else | |
333 | gcc_unreachable (); | |
334 | } | |
335 | ||
336 | ||
337 | /* Given a string NAME, return the string that it has been mapped to | |
338 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
339 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
340 | ||
341 | const char * | |
342 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
343 | const char *name) | |
344 | { | |
345 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
346 | struct lto_renaming_slot *slot; | |
347 | struct lto_renaming_slot r_slot; | |
348 | ||
349 | r_slot.new_name = name; | |
350 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
351 | if (slot) | |
352 | return slot->old_name; | |
353 | else | |
354 | return name; | |
355 | } | |
356 | ||
357 | /*****************************************************************************/ | |
358 | /* Input decl state object. */ | |
359 | /*****************************************************************************/ | |
360 | ||
361 | /* Return a newly created in-decl state object. */ | |
362 | ||
363 | struct lto_in_decl_state * | |
364 | lto_new_in_decl_state (void) | |
365 | { | |
766090c2 | 366 | return ggc_cleared_alloc<lto_in_decl_state> (); |
d7f09764 DN |
367 | } |
368 | ||
369 | /* Delete STATE and its components. */ | |
370 | ||
371 | void | |
372 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
373 | { | |
374 | int i; | |
375 | ||
376 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
377 | if (state->streams[i].trees) | |
49ba8180 JH |
378 | ggc_free (state->streams[i].trees); |
379 | ggc_free (state); | |
d7f09764 DN |
380 | } |
381 | ||
382 | /* Hashtable helpers. lto_in_decl_states are hash by their function decls. */ | |
383 | ||
384 | hashval_t | |
385 | lto_hash_in_decl_state (const void *p) | |
386 | { | |
387 | const struct lto_in_decl_state *state = (const struct lto_in_decl_state *) p; | |
388 | return htab_hash_pointer (state->fn_decl); | |
389 | } | |
390 | ||
391 | /* Return true if the fn_decl field of the lto_in_decl_state pointed to by | |
392 | P1 equals to the function decl P2. */ | |
393 | ||
394 | int | |
395 | lto_eq_in_decl_state (const void *p1, const void *p2) | |
396 | { | |
397 | const struct lto_in_decl_state *state1 = | |
398 | (const struct lto_in_decl_state *) p1; | |
399 | const struct lto_in_decl_state *state2 = | |
400 | (const struct lto_in_decl_state *) p2; | |
401 | return state1->fn_decl == state2->fn_decl; | |
402 | } | |
403 | ||
404 | ||
405 | /* Search the in-decl state of a function FUNC contained in the file | |
406 | associated with FILE_DATA. Return NULL if not found. */ | |
407 | ||
408 | struct lto_in_decl_state* | |
409 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
410 | tree func) | |
411 | { | |
412 | struct lto_in_decl_state temp; | |
413 | void **slot; | |
414 | ||
415 | temp.fn_decl = func; | |
416 | slot = htab_find_slot (file_data->function_decl_states, &temp, NO_INSERT); | |
417 | return slot? ((struct lto_in_decl_state*) *slot) : NULL; | |
418 | } | |
bc0fe8cb | 419 | |
256eefa9 JH |
420 | /* Free decl_states. */ |
421 | ||
422 | void | |
423 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
424 | { | |
425 | int i; | |
426 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
427 | ggc_free (state->streams[i].trees); | |
428 | ggc_free (state); | |
429 | } | |
430 | ||
431 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
432 | release trees needed by the NODE's body. */ | |
433 | ||
434 | void | |
5e20cdc9 | 435 | lto_free_function_in_decl_state_for_node (symtab_node *node) |
256eefa9 JH |
436 | { |
437 | struct lto_in_decl_state temp; | |
438 | void **slot; | |
439 | ||
67348ccc | 440 | if (!node->lto_file_data) |
256eefa9 JH |
441 | return; |
442 | ||
67348ccc DM |
443 | temp.fn_decl = node->decl; |
444 | slot = htab_find_slot (node->lto_file_data->function_decl_states, | |
256eefa9 JH |
445 | &temp, NO_INSERT); |
446 | if (slot && *slot) | |
447 | { | |
448 | lto_free_function_in_decl_state ((struct lto_in_decl_state*) *slot); | |
67348ccc | 449 | htab_clear_slot (node->lto_file_data->function_decl_states, |
256eefa9 JH |
450 | slot); |
451 | } | |
67348ccc | 452 | node->lto_file_data = NULL; |
256eefa9 JH |
453 | } |
454 | ||
bc0fe8cb JH |
455 | |
456 | /* Report read pass end of the section. */ | |
457 | ||
458 | void | |
459 | lto_section_overrun (struct lto_input_block *ib) | |
460 | { | |
f242c0a5 JH |
461 | fatal_error ("bytecode stream: trying to read %d bytes " |
462 | "after the end of the input buffer", ib->p - ib->len); | |
463 | } | |
464 | ||
465 | /* Report out of range value. */ | |
466 | ||
467 | void | |
468 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
469 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
470 | { | |
471 | fatal_error ("%s out of range: Range is %i to %i, value is %i", | |
472 | purpose, (int)min, (int)max, (int)val); | |
bc0fe8cb | 473 | } |