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7bfefa9d | 1 | /* Input functions for reading LTO sections. |
2 | ||
711789cc | 3 | Copyright (C) 2009-2013 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" |
b23fb4cb | 27 | #include "gimple.h" |
7bfefa9d | 28 | #include "expr.h" |
29 | #include "flags.h" | |
30 | #include "params.h" | |
31 | #include "input.h" | |
7bfefa9d | 32 | #include "hashtab.h" |
33 | #include "basic-block.h" | |
7bfefa9d | 34 | #include "function.h" |
35 | #include "ggc.h" | |
852f689e | 36 | #include "diagnostic-core.h" |
7bfefa9d | 37 | #include "except.h" |
38 | #include "vec.h" | |
39 | #include "timevar.h" | |
7bfefa9d | 40 | #include "lto-streamer.h" |
41 | #include "lto-compress.h" | |
57305941 | 42 | #include "ggc.h" |
7bfefa9d | 43 | |
44 | /* Section names. These must correspond to the values of | |
45 | enum lto_section_type. */ | |
46 | const char *lto_section_name[LTO_N_SECTION_TYPES] = | |
47 | { | |
48 | "decls", | |
49 | "function_body", | |
2e295599 | 50 | "statics", |
02b699d5 | 51 | "symtab", |
8d810329 | 52 | "refs", |
65d1b157 | 53 | "asm", |
2e295599 | 54 | "jmpfuncs", |
55 | "pureconst", | |
56 | "reference", | |
9e179a64 | 57 | "profile", |
341eb035 | 58 | "symbol_nodes", |
1bf41320 | 59 | "opts", |
c7b2cc59 | 60 | "cgraphopt", |
803a7988 | 61 | "inline", |
62 | "ipcp_trans" | |
7bfefa9d | 63 | }; |
64 | ||
7bfefa9d | 65 | |
7bfefa9d | 66 | /* Hooks so that the ipa passes can call into the lto front end to get |
67 | sections. */ | |
68 | ||
48e1416a | 69 | static struct lto_file_decl_data ** file_decl_data; |
7bfefa9d | 70 | static lto_get_section_data_f* get_section_f; |
71 | static lto_free_section_data_f* free_section_f; | |
72 | ||
73 | ||
74 | /* This is called from the lto front end to set up the hooks that are | |
75 | used by the ipa passes to get the data that they will | |
76 | deserialize. */ | |
77 | ||
48e1416a | 78 | void |
79 | lto_set_in_hooks (struct lto_file_decl_data ** data, | |
7bfefa9d | 80 | lto_get_section_data_f* get_f, |
81 | lto_free_section_data_f* free_f) | |
82 | { | |
83 | file_decl_data = data; | |
84 | get_section_f = get_f; | |
85 | free_section_f = free_f; | |
86 | } | |
87 | ||
88 | ||
89 | /* Return an array of file decl datas for all of the files passed to | |
90 | this compilation. */ | |
91 | ||
92 | struct lto_file_decl_data ** | |
93 | lto_get_file_decl_data (void) | |
94 | { | |
95 | gcc_assert (file_decl_data); | |
96 | return file_decl_data; | |
97 | } | |
98 | ||
99 | /* Buffer structure for accumulating data from compression callbacks. */ | |
100 | ||
101 | struct lto_buffer | |
102 | { | |
103 | char *data; | |
104 | size_t length; | |
105 | }; | |
106 | ||
107 | /* Compression callback, append LENGTH bytes from DATA to the buffer pointed | |
108 | to by OPAQUE. */ | |
109 | ||
110 | static void | |
111 | lto_append_data (const char *data, unsigned length, void *opaque) | |
112 | { | |
113 | struct lto_buffer *buffer = (struct lto_buffer *) opaque; | |
114 | ||
115 | buffer->data = (char *) xrealloc (buffer->data, buffer->length + length); | |
116 | memcpy (buffer->data + buffer->length, data, length); | |
117 | buffer->length += length; | |
118 | } | |
119 | ||
120 | /* Header placed in returned uncompressed data streams. Allows the | |
121 | uncompressed allocated data to be mapped back to the underlying | |
122 | compressed data for use with free_section_f. */ | |
123 | ||
124 | struct lto_data_header | |
125 | { | |
126 | const char *data; | |
127 | size_t len; | |
128 | }; | |
129 | ||
130 | /* Return a char pointer to the start of a data stream for an LTO pass | |
131 | or function. FILE_DATA indicates where to obtain the data. | |
132 | SECTION_TYPE is the type of information to be obtained. NAME is | |
133 | the name of the function and is only used when finding a function | |
134 | body; otherwise it is NULL. LEN is the size of the data | |
135 | returned. */ | |
136 | ||
137 | const char * | |
48e1416a | 138 | lto_get_section_data (struct lto_file_decl_data *file_data, |
7bfefa9d | 139 | enum lto_section_type section_type, |
48e1416a | 140 | const char *name, |
7bfefa9d | 141 | size_t *len) |
142 | { | |
143 | const char *data = (get_section_f) (file_data, section_type, name, len); | |
144 | const size_t header_length = sizeof (struct lto_data_header); | |
145 | struct lto_data_header *header; | |
146 | struct lto_buffer buffer; | |
147 | struct lto_compression_stream *stream; | |
148 | lto_stats.section_size[section_type] += *len; | |
149 | ||
150 | if (data == NULL) | |
151 | return NULL; | |
152 | ||
153 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
154 | suppress uncompression if flag_ltrans. */ | |
155 | if (flag_ltrans) | |
156 | return data; | |
157 | ||
158 | /* Create a mapping header containing the underlying data and length, | |
159 | and prepend this to the uncompression buffer. The uncompressed data | |
160 | then follows, and a pointer to the start of the uncompressed data is | |
161 | returned. */ | |
162 | header = (struct lto_data_header *) xmalloc (header_length); | |
163 | header->data = data; | |
164 | header->len = *len; | |
48e1416a | 165 | |
7bfefa9d | 166 | buffer.data = (char *) header; |
48e1416a | 167 | buffer.length = header_length; |
7bfefa9d | 168 | |
169 | stream = lto_start_uncompression (lto_append_data, &buffer); | |
170 | lto_uncompress_block (stream, data, *len); | |
171 | lto_end_uncompression (stream); | |
172 | ||
173 | *len = buffer.length - header_length; | |
174 | return buffer.data + header_length; | |
175 | } | |
176 | ||
177 | ||
178 | /* Free the data found from the above call. The first three | |
179 | parameters are the same as above. DATA is the data to be freed and | |
180 | LEN is the length of that data. */ | |
181 | ||
48e1416a | 182 | void |
183 | lto_free_section_data (struct lto_file_decl_data *file_data, | |
7bfefa9d | 184 | enum lto_section_type section_type, |
185 | const char *name, | |
186 | const char *data, | |
187 | size_t len) | |
188 | { | |
189 | const size_t header_length = sizeof (struct lto_data_header); | |
190 | const char *real_data = data - header_length; | |
191 | const struct lto_data_header *header | |
192 | = (const struct lto_data_header *) real_data; | |
193 | ||
194 | gcc_assert (free_section_f); | |
195 | ||
196 | /* FIXME lto: WPA mode does not write compressed sections, so for now | |
197 | suppress uncompression mapping if flag_ltrans. */ | |
198 | if (flag_ltrans) | |
199 | { | |
200 | (free_section_f) (file_data, section_type, name, data, len); | |
201 | return; | |
202 | } | |
203 | ||
204 | /* The underlying data address has been extracted from the mapping header. | |
205 | Free that, then free the allocated uncompression buffer. */ | |
206 | (free_section_f) (file_data, section_type, name, header->data, header->len); | |
207 | free (CONST_CAST (char *, real_data)); | |
208 | } | |
209 | ||
210 | ||
211 | /* Load a section of type SECTION_TYPE from FILE_DATA, parse the | |
212 | header and then return an input block pointing to the section. The | |
213 | raw pointer to the section is returned in DATAR and LEN. These are | |
214 | used to free the section. Return NULL if the section is not present. */ | |
215 | ||
216 | struct lto_input_block * | |
48e1416a | 217 | lto_create_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 218 | enum lto_section_type section_type, |
219 | const char **datar, size_t *len) | |
220 | { | |
221 | const char *data = lto_get_section_data (file_data, section_type, NULL, len); | |
48e1416a | 222 | const struct lto_simple_header * header |
7bfefa9d | 223 | = (const struct lto_simple_header *) data; |
224 | ||
225 | struct lto_input_block* ib_main; | |
949e5786 | 226 | int main_offset = sizeof (struct lto_simple_header); |
7bfefa9d | 227 | |
228 | if (!data) | |
229 | return NULL; | |
230 | ||
231 | ib_main = XNEW (struct lto_input_block); | |
232 | ||
233 | *datar = data; | |
234 | LTO_INIT_INPUT_BLOCK_PTR (ib_main, data + main_offset, | |
235 | 0, header->main_size); | |
236 | ||
237 | return ib_main; | |
238 | } | |
239 | ||
240 | ||
241 | /* Close the section returned from a call to | |
242 | LTO_CREATE_SIMPLE_INPUT_BLOCK. IB is the input block returned from | |
243 | that call. The FILE_DATA and SECTION_TYPE are the same as what was | |
244 | passed to that call and the DATA and LEN are what was returned from | |
245 | that call. */ | |
246 | ||
247 | void | |
48e1416a | 248 | lto_destroy_simple_input_block (struct lto_file_decl_data *file_data, |
7bfefa9d | 249 | enum lto_section_type section_type, |
250 | struct lto_input_block *ib, | |
251 | const char *data, size_t len) | |
252 | { | |
253 | free (ib); | |
254 | lto_free_section_data (file_data, section_type, NULL, data, len); | |
255 | } | |
256 | ||
257 | /*****************************************************************************/ | |
258 | /* Record renamings of static declarations */ | |
259 | /*****************************************************************************/ | |
260 | ||
261 | struct lto_renaming_slot | |
262 | { | |
263 | const char *old_name; | |
264 | const char *new_name; | |
265 | }; | |
266 | ||
267 | /* Returns a hash code for P. */ | |
268 | ||
269 | static hashval_t | |
270 | hash_name (const void *p) | |
271 | { | |
272 | const struct lto_renaming_slot *ds = (const struct lto_renaming_slot *) p; | |
273 | return (hashval_t) htab_hash_string (ds->new_name); | |
274 | } | |
275 | ||
276 | /* Returns nonzero if P1 and P2 are equal. */ | |
277 | ||
278 | static int | |
279 | eq_name (const void *p1, const void *p2) | |
280 | { | |
281 | const struct lto_renaming_slot *s1 = | |
282 | (const struct lto_renaming_slot *) p1; | |
283 | const struct lto_renaming_slot *s2 = | |
284 | (const struct lto_renaming_slot *) p2; | |
285 | ||
286 | return strcmp (s1->new_name, s2->new_name) == 0; | |
287 | } | |
288 | ||
289 | /* Free a renaming table entry. */ | |
290 | ||
291 | static void | |
292 | renaming_slot_free (void *slot) | |
293 | { | |
294 | struct lto_renaming_slot *s = (struct lto_renaming_slot *) slot; | |
295 | ||
296 | free (CONST_CAST (void *, (const void *) s->old_name)); | |
297 | free (CONST_CAST (void *, (const void *) s->new_name)); | |
298 | free ((void *) s); | |
299 | } | |
300 | ||
301 | /* Create an empty hash table for recording declaration renamings. */ | |
302 | ||
303 | htab_t | |
304 | lto_create_renaming_table (void) | |
305 | { | |
306 | return htab_create (37, hash_name, eq_name, renaming_slot_free); | |
307 | } | |
308 | ||
309 | /* Record a declaration name mapping OLD_NAME -> NEW_NAME. DECL_DATA | |
310 | holds the renaming hash table to use. */ | |
311 | ||
312 | void | |
313 | lto_record_renamed_decl (struct lto_file_decl_data *decl_data, | |
314 | const char *old_name, const char *new_name) | |
315 | { | |
316 | void **slot; | |
317 | struct lto_renaming_slot r_slot; | |
318 | ||
319 | r_slot.new_name = new_name; | |
320 | slot = htab_find_slot (decl_data->renaming_hash_table, &r_slot, INSERT); | |
321 | if (*slot == NULL) | |
322 | { | |
323 | struct lto_renaming_slot *new_slot = XNEW (struct lto_renaming_slot); | |
324 | new_slot->old_name = xstrdup (old_name); | |
325 | new_slot->new_name = xstrdup (new_name); | |
326 | *slot = new_slot; | |
327 | } | |
328 | else | |
329 | gcc_unreachable (); | |
330 | } | |
331 | ||
332 | ||
333 | /* Given a string NAME, return the string that it has been mapped to | |
334 | by lto_record_renamed_decl. If NAME was not renamed, it is | |
335 | returned unchanged. DECL_DATA holds the renaming hash table to use. */ | |
336 | ||
337 | const char * | |
338 | lto_get_decl_name_mapping (struct lto_file_decl_data *decl_data, | |
339 | const char *name) | |
340 | { | |
341 | htab_t renaming_hash_table = decl_data->renaming_hash_table; | |
342 | struct lto_renaming_slot *slot; | |
343 | struct lto_renaming_slot r_slot; | |
344 | ||
345 | r_slot.new_name = name; | |
346 | slot = (struct lto_renaming_slot *) htab_find (renaming_hash_table, &r_slot); | |
347 | if (slot) | |
348 | return slot->old_name; | |
349 | else | |
350 | return name; | |
351 | } | |
352 | ||
353 | /*****************************************************************************/ | |
354 | /* Input decl state object. */ | |
355 | /*****************************************************************************/ | |
356 | ||
357 | /* Return a newly created in-decl state object. */ | |
358 | ||
359 | struct lto_in_decl_state * | |
360 | lto_new_in_decl_state (void) | |
361 | { | |
ba72912a | 362 | return ggc_alloc_cleared_lto_in_decl_state (); |
7bfefa9d | 363 | } |
364 | ||
365 | /* Delete STATE and its components. */ | |
366 | ||
367 | void | |
368 | lto_delete_in_decl_state (struct lto_in_decl_state *state) | |
369 | { | |
370 | int i; | |
371 | ||
372 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
373 | if (state->streams[i].trees) | |
57305941 | 374 | ggc_free (state->streams[i].trees); |
375 | ggc_free (state); | |
7bfefa9d | 376 | } |
377 | ||
378 | /* Hashtable helpers. lto_in_decl_states are hash by their function decls. */ | |
379 | ||
380 | hashval_t | |
381 | lto_hash_in_decl_state (const void *p) | |
382 | { | |
383 | const struct lto_in_decl_state *state = (const struct lto_in_decl_state *) p; | |
384 | return htab_hash_pointer (state->fn_decl); | |
385 | } | |
386 | ||
387 | /* Return true if the fn_decl field of the lto_in_decl_state pointed to by | |
388 | P1 equals to the function decl P2. */ | |
389 | ||
390 | int | |
391 | lto_eq_in_decl_state (const void *p1, const void *p2) | |
392 | { | |
393 | const struct lto_in_decl_state *state1 = | |
394 | (const struct lto_in_decl_state *) p1; | |
395 | const struct lto_in_decl_state *state2 = | |
396 | (const struct lto_in_decl_state *) p2; | |
397 | return state1->fn_decl == state2->fn_decl; | |
398 | } | |
399 | ||
400 | ||
401 | /* Search the in-decl state of a function FUNC contained in the file | |
402 | associated with FILE_DATA. Return NULL if not found. */ | |
403 | ||
404 | struct lto_in_decl_state* | |
405 | lto_get_function_in_decl_state (struct lto_file_decl_data *file_data, | |
406 | tree func) | |
407 | { | |
408 | struct lto_in_decl_state temp; | |
409 | void **slot; | |
410 | ||
411 | temp.fn_decl = func; | |
412 | slot = htab_find_slot (file_data->function_decl_states, &temp, NO_INSERT); | |
413 | return slot? ((struct lto_in_decl_state*) *slot) : NULL; | |
414 | } | |
673ca05f | 415 | |
5f74a074 | 416 | /* Free decl_states. */ |
417 | ||
418 | void | |
419 | lto_free_function_in_decl_state (struct lto_in_decl_state *state) | |
420 | { | |
421 | int i; | |
422 | for (i = 0; i < LTO_N_DECL_STREAMS; i++) | |
423 | ggc_free (state->streams[i].trees); | |
424 | ggc_free (state); | |
425 | } | |
426 | ||
427 | /* Free decl_states associated with NODE. This makes it possible to furhter | |
428 | release trees needed by the NODE's body. */ | |
429 | ||
430 | void | |
431 | lto_free_function_in_decl_state_for_node (symtab_node node) | |
432 | { | |
433 | struct lto_in_decl_state temp; | |
434 | void **slot; | |
435 | ||
02774f2d | 436 | if (!node->lto_file_data) |
5f74a074 | 437 | return; |
438 | ||
02774f2d | 439 | temp.fn_decl = node->decl; |
440 | slot = htab_find_slot (node->lto_file_data->function_decl_states, | |
5f74a074 | 441 | &temp, NO_INSERT); |
442 | if (slot && *slot) | |
443 | { | |
444 | lto_free_function_in_decl_state ((struct lto_in_decl_state*) *slot); | |
02774f2d | 445 | htab_clear_slot (node->lto_file_data->function_decl_states, |
5f74a074 | 446 | slot); |
447 | } | |
02774f2d | 448 | node->lto_file_data = NULL; |
5f74a074 | 449 | } |
450 | ||
673ca05f | 451 | |
452 | /* Report read pass end of the section. */ | |
453 | ||
454 | void | |
455 | lto_section_overrun (struct lto_input_block *ib) | |
456 | { | |
5f8d4adf | 457 | fatal_error ("bytecode stream: trying to read %d bytes " |
458 | "after the end of the input buffer", ib->p - ib->len); | |
459 | } | |
460 | ||
461 | /* Report out of range value. */ | |
462 | ||
463 | void | |
464 | lto_value_range_error (const char *purpose, HOST_WIDE_INT val, | |
465 | HOST_WIDE_INT min, HOST_WIDE_INT max) | |
466 | { | |
467 | fatal_error ("%s out of range: Range is %i to %i, value is %i", | |
468 | purpose, (int)min, (int)max, (int)val); | |
673ca05f | 469 | } |