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564fe867 | 1 | /* Callgraph clones |
d1e082c2 | 2 | Copyright (C) 2003-2013 Free Software Foundation, Inc. |
564fe867 JH |
3 | Contributed by Jan Hubicka |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | /* This module provide facilities for clonning functions. I.e. creating | |
22 | new functions based on existing functions with simple modifications, | |
23 | such as replacement of parameters. | |
24 | ||
25 | To allow whole program optimization without actual presence of function | |
26 | bodies, an additional infrastructure is provided for so-called virtual | |
27 | clones | |
28 | ||
29 | A virtual clone in the callgraph is a function that has no | |
30 | associated body, just a description of how to create its body based | |
31 | on a different function (which itself may be a virtual clone). | |
32 | ||
33 | The description of function modifications includes adjustments to | |
34 | the function's signature (which allows, for example, removing or | |
35 | adding function arguments), substitutions to perform on the | |
36 | function body, and, for inlined functions, a pointer to the | |
37 | function that it will be inlined into. | |
38 | ||
39 | It is also possible to redirect any edge of the callgraph from a | |
40 | function to its virtual clone. This implies updating of the call | |
41 | site to adjust for the new function signature. | |
42 | ||
43 | Most of the transformations performed by inter-procedural | |
44 | optimizations can be represented via virtual clones. For | |
45 | instance, a constant propagation pass can produce a virtual clone | |
46 | of the function which replaces one of its arguments by a | |
47 | constant. The inliner can represent its decisions by producing a | |
48 | clone of a function whose body will be later integrated into | |
49 | a given function. | |
50 | ||
51 | Using virtual clones, the program can be easily updated | |
52 | during the Execute stage, solving most of pass interactions | |
53 | problems that would otherwise occur during Transform. | |
54 | ||
55 | Virtual clones are later materialized in the LTRANS stage and | |
56 | turned into real functions. Passes executed after the virtual | |
57 | clone were introduced also perform their Transform stage | |
58 | on new functions, so for a pass there is no significant | |
59 | difference between operating on a real function or a virtual | |
60 | clone introduced before its Execute stage. | |
61 | ||
62 | Optimization passes then work on virtual clones introduced before | |
63 | their Execute stage as if they were real functions. The | |
64 | only difference is that clones are not visible during the | |
65 | Generate Summary stage. */ | |
66 | ||
67 | #include "config.h" | |
68 | #include "system.h" | |
69 | #include "coretypes.h" | |
70 | #include "tm.h" | |
71 | #include "tree.h" | |
564fe867 JH |
72 | #include "rtl.h" |
73 | #include "tree-flow.h" | |
74 | #include "tree-inline.h" | |
75 | #include "langhooks.h" | |
76 | #include "pointer-set.h" | |
77 | #include "toplev.h" | |
78 | #include "flags.h" | |
79 | #include "ggc.h" | |
80 | #include "debug.h" | |
81 | #include "target.h" | |
82 | #include "cgraph.h" | |
83 | #include "diagnostic.h" | |
564fe867 | 84 | #include "params.h" |
564fe867 JH |
85 | #include "intl.h" |
86 | #include "function.h" | |
87 | #include "ipa-prop.h" | |
88 | #include "gimple.h" | |
89 | #include "tree-iterator.h" | |
564fe867 JH |
90 | #include "tree-dump.h" |
91 | #include "gimple-pretty-print.h" | |
564fe867 | 92 | #include "coverage.h" |
564fe867 JH |
93 | #include "ipa-inline.h" |
94 | #include "ipa-utils.h" | |
95 | #include "lto-streamer.h" | |
96 | #include "except.h" | |
97 | ||
98 | /* Create clone of E in the node N represented by CALL_EXPR the callgraph. */ | |
99 | struct cgraph_edge * | |
100 | cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n, | |
101 | gimple call_stmt, unsigned stmt_uid, gcov_type count_scale, | |
102 | int freq_scale, bool update_original) | |
103 | { | |
104 | struct cgraph_edge *new_edge; | |
8b47039c | 105 | gcov_type count = apply_probability (e->count, count_scale); |
564fe867 JH |
106 | gcov_type freq; |
107 | ||
108 | /* We do not want to ignore loop nest after frequency drops to 0. */ | |
109 | if (!freq_scale) | |
110 | freq_scale = 1; | |
111 | freq = e->frequency * (gcov_type) freq_scale / CGRAPH_FREQ_BASE; | |
112 | if (freq > CGRAPH_FREQ_MAX) | |
113 | freq = CGRAPH_FREQ_MAX; | |
114 | ||
115 | if (e->indirect_unknown_callee) | |
116 | { | |
117 | tree decl; | |
118 | ||
119 | if (call_stmt && (decl = gimple_call_fndecl (call_stmt))) | |
120 | { | |
121 | struct cgraph_node *callee = cgraph_get_node (decl); | |
122 | gcc_checking_assert (callee); | |
123 | new_edge = cgraph_create_edge (n, callee, call_stmt, count, freq); | |
124 | } | |
125 | else | |
126 | { | |
127 | new_edge = cgraph_create_indirect_edge (n, call_stmt, | |
128 | e->indirect_info->ecf_flags, | |
129 | count, freq); | |
130 | *new_edge->indirect_info = *e->indirect_info; | |
131 | } | |
132 | } | |
133 | else | |
134 | { | |
135 | new_edge = cgraph_create_edge (n, e->callee, call_stmt, count, freq); | |
136 | if (e->indirect_info) | |
137 | { | |
138 | new_edge->indirect_info | |
139 | = ggc_alloc_cleared_cgraph_indirect_call_info (); | |
140 | *new_edge->indirect_info = *e->indirect_info; | |
141 | } | |
142 | } | |
143 | ||
144 | new_edge->inline_failed = e->inline_failed; | |
145 | new_edge->indirect_inlining_edge = e->indirect_inlining_edge; | |
146 | new_edge->lto_stmt_uid = stmt_uid; | |
147 | /* Clone flags that depend on call_stmt availability manually. */ | |
148 | new_edge->can_throw_external = e->can_throw_external; | |
149 | new_edge->call_stmt_cannot_inline_p = e->call_stmt_cannot_inline_p; | |
150 | if (update_original) | |
151 | { | |
152 | e->count -= new_edge->count; | |
153 | if (e->count < 0) | |
154 | e->count = 0; | |
155 | } | |
156 | cgraph_call_edge_duplication_hooks (e, new_edge); | |
157 | return new_edge; | |
158 | } | |
159 | ||
160 | ||
161 | /* Create node representing clone of N executed COUNT times. Decrease | |
162 | the execution counts from original node too. | |
163 | The new clone will have decl set to DECL that may or may not be the same | |
164 | as decl of N. | |
165 | ||
166 | When UPDATE_ORIGINAL is true, the counts are subtracted from the original | |
167 | function's profile to reflect the fact that part of execution is handled | |
168 | by node. | |
169 | When CALL_DUPLICATOIN_HOOK is true, the ipa passes are acknowledged about | |
44a60244 MJ |
170 | the new clone. Otherwise the caller is responsible for doing so later. |
171 | ||
172 | If the new node is being inlined into another one, NEW_INLINED_TO should be | |
173 | the outline function the new one is (even indirectly) inlined to. All hooks | |
174 | will see this in node's global.inlined_to, when invoked. Can be NULL if the | |
175 | node is not inlined. */ | |
564fe867 JH |
176 | |
177 | struct cgraph_node * | |
178 | cgraph_clone_node (struct cgraph_node *n, tree decl, gcov_type count, int freq, | |
179 | bool update_original, | |
9771b263 | 180 | vec<cgraph_edge_p> redirect_callers, |
44a60244 MJ |
181 | bool call_duplication_hook, |
182 | struct cgraph_node *new_inlined_to) | |
564fe867 JH |
183 | { |
184 | struct cgraph_node *new_node = cgraph_create_empty_node (); | |
185 | struct cgraph_edge *e; | |
186 | gcov_type count_scale; | |
187 | unsigned i; | |
188 | ||
189 | new_node->symbol.decl = decl; | |
190 | symtab_register_node ((symtab_node)new_node); | |
191 | new_node->origin = n->origin; | |
a19b1432 | 192 | new_node->symbol.lto_file_data = n->symbol.lto_file_data; |
564fe867 JH |
193 | if (new_node->origin) |
194 | { | |
195 | new_node->next_nested = new_node->origin->nested; | |
196 | new_node->origin->nested = new_node; | |
197 | } | |
e70670cf JH |
198 | new_node->symbol.analyzed = n->symbol.analyzed; |
199 | new_node->symbol.definition = n->symbol.definition; | |
564fe867 JH |
200 | new_node->local = n->local; |
201 | new_node->symbol.externally_visible = false; | |
202 | new_node->local.local = true; | |
203 | new_node->global = n->global; | |
44a60244 | 204 | new_node->global.inlined_to = new_inlined_to; |
564fe867 JH |
205 | new_node->rtl = n->rtl; |
206 | new_node->count = count; | |
207 | new_node->frequency = n->frequency; | |
208 | new_node->clone = n->clone; | |
9771b263 | 209 | new_node->clone.tree_map = NULL; |
564fe867 JH |
210 | if (n->count) |
211 | { | |
212 | if (new_node->count > n->count) | |
213 | count_scale = REG_BR_PROB_BASE; | |
214 | else | |
8b47039c | 215 | count_scale = GCOV_COMPUTE_SCALE (new_node->count, n->count); |
564fe867 JH |
216 | } |
217 | else | |
218 | count_scale = 0; | |
219 | if (update_original) | |
220 | { | |
221 | n->count -= count; | |
222 | if (n->count < 0) | |
223 | n->count = 0; | |
224 | } | |
225 | ||
9771b263 | 226 | FOR_EACH_VEC_ELT (redirect_callers, i, e) |
564fe867 JH |
227 | { |
228 | /* Redirect calls to the old version node to point to its new | |
229 | version. */ | |
230 | cgraph_redirect_edge_callee (e, new_node); | |
231 | } | |
232 | ||
233 | ||
234 | for (e = n->callees;e; e=e->next_callee) | |
235 | cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid, | |
236 | count_scale, freq, update_original); | |
237 | ||
238 | for (e = n->indirect_calls; e; e = e->next_callee) | |
239 | cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid, | |
240 | count_scale, freq, update_original); | |
241 | ipa_clone_references ((symtab_node)new_node, &n->symbol.ref_list); | |
242 | ||
243 | new_node->next_sibling_clone = n->clones; | |
244 | if (n->clones) | |
245 | n->clones->prev_sibling_clone = new_node; | |
246 | n->clones = new_node; | |
247 | new_node->clone_of = n; | |
248 | ||
249 | if (call_duplication_hook) | |
250 | cgraph_call_node_duplication_hooks (n, new_node); | |
251 | return new_node; | |
252 | } | |
253 | ||
254 | /* Create a new name for clone of DECL, add SUFFIX. Returns an identifier. */ | |
255 | ||
256 | static GTY(()) unsigned int clone_fn_id_num; | |
257 | ||
258 | tree | |
259 | clone_function_name (tree decl, const char *suffix) | |
260 | { | |
261 | tree name = DECL_ASSEMBLER_NAME (decl); | |
262 | size_t len = IDENTIFIER_LENGTH (name); | |
263 | char *tmp_name, *prefix; | |
264 | ||
265 | prefix = XALLOCAVEC (char, len + strlen (suffix) + 2); | |
266 | memcpy (prefix, IDENTIFIER_POINTER (name), len); | |
267 | strcpy (prefix + len + 1, suffix); | |
268 | #ifndef NO_DOT_IN_LABEL | |
269 | prefix[len] = '.'; | |
270 | #elif !defined NO_DOLLAR_IN_LABEL | |
271 | prefix[len] = '$'; | |
272 | #else | |
273 | prefix[len] = '_'; | |
274 | #endif | |
275 | ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix, clone_fn_id_num++); | |
276 | return get_identifier (tmp_name); | |
277 | } | |
278 | ||
279 | /* Create callgraph node clone with new declaration. The actual body will | |
280 | be copied later at compilation stage. | |
281 | ||
282 | TODO: after merging in ipa-sra use function call notes instead of args_to_skip | |
283 | bitmap interface. | |
284 | */ | |
285 | struct cgraph_node * | |
286 | cgraph_create_virtual_clone (struct cgraph_node *old_node, | |
9771b263 DN |
287 | vec<cgraph_edge_p> redirect_callers, |
288 | vec<ipa_replace_map_p, va_gc> *tree_map, | |
564fe867 JH |
289 | bitmap args_to_skip, |
290 | const char * suffix) | |
291 | { | |
292 | tree old_decl = old_node->symbol.decl; | |
293 | struct cgraph_node *new_node = NULL; | |
294 | tree new_decl; | |
295 | size_t i; | |
296 | struct ipa_replace_map *map; | |
297 | ||
298 | if (!flag_wpa) | |
299 | gcc_checking_assert (tree_versionable_function_p (old_decl)); | |
300 | ||
301 | gcc_assert (old_node->local.can_change_signature || !args_to_skip); | |
302 | ||
303 | /* Make a new FUNCTION_DECL tree node */ | |
304 | if (!args_to_skip) | |
305 | new_decl = copy_node (old_decl); | |
306 | else | |
307 | new_decl = build_function_decl_skip_args (old_decl, args_to_skip, false); | |
49bde175 JH |
308 | |
309 | /* These pointers represent function body and will be populated only when clone | |
310 | is materialized. */ | |
311 | gcc_assert (new_decl != old_decl); | |
564fe867 | 312 | DECL_STRUCT_FUNCTION (new_decl) = NULL; |
49bde175 JH |
313 | DECL_ARGUMENTS (new_decl) = NULL; |
314 | DECL_INITIAL (new_decl) = NULL; | |
315 | DECL_RESULT (new_decl) = NULL; | |
316 | /* We can not do DECL_RESULT (new_decl) = NULL; here because of LTO partitioning | |
317 | sometimes storing only clone decl instead of original. */ | |
564fe867 JH |
318 | |
319 | /* Generate a new name for the new version. */ | |
320 | DECL_NAME (new_decl) = clone_function_name (old_decl, suffix); | |
321 | SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl)); | |
322 | SET_DECL_RTL (new_decl, NULL); | |
323 | ||
324 | new_node = cgraph_clone_node (old_node, new_decl, old_node->count, | |
325 | CGRAPH_FREQ_BASE, false, | |
44a60244 | 326 | redirect_callers, false, NULL); |
564fe867 JH |
327 | /* Update the properties. |
328 | Make clone visible only within this translation unit. Make sure | |
329 | that is not weak also. | |
330 | ??? We cannot use COMDAT linkage because there is no | |
331 | ABI support for this. */ | |
332 | DECL_EXTERNAL (new_node->symbol.decl) = 0; | |
333 | if (DECL_ONE_ONLY (old_decl)) | |
334 | DECL_SECTION_NAME (new_node->symbol.decl) = NULL; | |
335 | DECL_COMDAT_GROUP (new_node->symbol.decl) = 0; | |
336 | TREE_PUBLIC (new_node->symbol.decl) = 0; | |
337 | DECL_COMDAT (new_node->symbol.decl) = 0; | |
338 | DECL_WEAK (new_node->symbol.decl) = 0; | |
8222c37e | 339 | DECL_VIRTUAL_P (new_node->symbol.decl) = 0; |
564fe867 JH |
340 | DECL_STATIC_CONSTRUCTOR (new_node->symbol.decl) = 0; |
341 | DECL_STATIC_DESTRUCTOR (new_node->symbol.decl) = 0; | |
342 | new_node->clone.tree_map = tree_map; | |
343 | new_node->clone.args_to_skip = args_to_skip; | |
702d8703 JH |
344 | |
345 | /* Clones of global symbols or symbols with unique names are unique. */ | |
346 | if ((TREE_PUBLIC (old_decl) | |
347 | && !DECL_EXTERNAL (old_decl) | |
348 | && !DECL_WEAK (old_decl) | |
349 | && !DECL_COMDAT (old_decl)) | |
350 | || in_lto_p) | |
351 | new_node->symbol.unique_name = true; | |
9771b263 | 352 | FOR_EACH_VEC_SAFE_ELT (tree_map, i, map) |
79ee9826 MJ |
353 | ipa_maybe_record_reference ((symtab_node) new_node, map->new_tree, |
354 | IPA_REF_ADDR, NULL); | |
564fe867 JH |
355 | if (!args_to_skip) |
356 | new_node->clone.combined_args_to_skip = old_node->clone.combined_args_to_skip; | |
357 | else if (old_node->clone.combined_args_to_skip) | |
358 | { | |
359 | int newi = 0, oldi = 0; | |
360 | tree arg; | |
361 | bitmap new_args_to_skip = BITMAP_GGC_ALLOC (); | |
362 | struct cgraph_node *orig_node; | |
363 | for (orig_node = old_node; orig_node->clone_of; orig_node = orig_node->clone_of) | |
364 | ; | |
365 | for (arg = DECL_ARGUMENTS (orig_node->symbol.decl); | |
366 | arg; arg = DECL_CHAIN (arg), oldi++) | |
367 | { | |
368 | if (bitmap_bit_p (old_node->clone.combined_args_to_skip, oldi)) | |
369 | { | |
370 | bitmap_set_bit (new_args_to_skip, oldi); | |
371 | continue; | |
372 | } | |
373 | if (bitmap_bit_p (args_to_skip, newi)) | |
374 | bitmap_set_bit (new_args_to_skip, oldi); | |
375 | newi++; | |
376 | } | |
377 | new_node->clone.combined_args_to_skip = new_args_to_skip; | |
378 | } | |
379 | else | |
380 | new_node->clone.combined_args_to_skip = args_to_skip; | |
381 | new_node->symbol.externally_visible = 0; | |
382 | new_node->local.local = 1; | |
383 | new_node->lowered = true; | |
384 | ||
385 | cgraph_call_node_duplication_hooks (old_node, new_node); | |
386 | ||
387 | ||
388 | return new_node; | |
389 | } | |
390 | ||
391 | /* NODE is being removed from symbol table; see if its entry can be replaced by | |
392 | other inline clone. */ | |
393 | struct cgraph_node * | |
394 | cgraph_find_replacement_node (struct cgraph_node *node) | |
395 | { | |
396 | struct cgraph_node *next_inline_clone, *replacement; | |
397 | ||
398 | for (next_inline_clone = node->clones; | |
399 | next_inline_clone | |
400 | && next_inline_clone->symbol.decl != node->symbol.decl; | |
401 | next_inline_clone = next_inline_clone->next_sibling_clone) | |
402 | ; | |
403 | ||
404 | /* If there is inline clone of the node being removed, we need | |
405 | to put it into the position of removed node and reorganize all | |
406 | other clones to be based on it. */ | |
407 | if (next_inline_clone) | |
408 | { | |
409 | struct cgraph_node *n; | |
410 | struct cgraph_node *new_clones; | |
411 | ||
412 | replacement = next_inline_clone; | |
413 | ||
414 | /* Unlink inline clone from the list of clones of removed node. */ | |
415 | if (next_inline_clone->next_sibling_clone) | |
416 | next_inline_clone->next_sibling_clone->prev_sibling_clone | |
417 | = next_inline_clone->prev_sibling_clone; | |
418 | if (next_inline_clone->prev_sibling_clone) | |
419 | { | |
420 | gcc_assert (node->clones != next_inline_clone); | |
421 | next_inline_clone->prev_sibling_clone->next_sibling_clone | |
422 | = next_inline_clone->next_sibling_clone; | |
423 | } | |
424 | else | |
425 | { | |
426 | gcc_assert (node->clones == next_inline_clone); | |
427 | node->clones = next_inline_clone->next_sibling_clone; | |
428 | } | |
429 | ||
430 | new_clones = node->clones; | |
431 | node->clones = NULL; | |
432 | ||
433 | /* Copy clone info. */ | |
434 | next_inline_clone->clone = node->clone; | |
435 | ||
436 | /* Now place it into clone tree at same level at NODE. */ | |
437 | next_inline_clone->clone_of = node->clone_of; | |
438 | next_inline_clone->prev_sibling_clone = NULL; | |
439 | next_inline_clone->next_sibling_clone = NULL; | |
440 | if (node->clone_of) | |
441 | { | |
442 | if (node->clone_of->clones) | |
443 | node->clone_of->clones->prev_sibling_clone = next_inline_clone; | |
444 | next_inline_clone->next_sibling_clone = node->clone_of->clones; | |
445 | node->clone_of->clones = next_inline_clone; | |
446 | } | |
447 | ||
448 | /* Merge the clone list. */ | |
449 | if (new_clones) | |
450 | { | |
451 | if (!next_inline_clone->clones) | |
452 | next_inline_clone->clones = new_clones; | |
453 | else | |
454 | { | |
455 | n = next_inline_clone->clones; | |
456 | while (n->next_sibling_clone) | |
457 | n = n->next_sibling_clone; | |
458 | n->next_sibling_clone = new_clones; | |
459 | new_clones->prev_sibling_clone = n; | |
460 | } | |
461 | } | |
462 | ||
463 | /* Update clone_of pointers. */ | |
464 | n = new_clones; | |
465 | while (n) | |
466 | { | |
467 | n->clone_of = next_inline_clone; | |
468 | n = n->next_sibling_clone; | |
469 | } | |
470 | return replacement; | |
471 | } | |
472 | else | |
473 | return NULL; | |
474 | } | |
475 | ||
476 | /* Like cgraph_set_call_stmt but walk the clone tree and update all | |
477 | clones sharing the same function body. */ | |
478 | ||
479 | void | |
480 | cgraph_set_call_stmt_including_clones (struct cgraph_node *orig, | |
481 | gimple old_stmt, gimple new_stmt) | |
482 | { | |
483 | struct cgraph_node *node; | |
484 | struct cgraph_edge *edge = cgraph_edge (orig, old_stmt); | |
485 | ||
486 | if (edge) | |
487 | cgraph_set_call_stmt (edge, new_stmt); | |
488 | ||
489 | node = orig->clones; | |
490 | if (node) | |
491 | while (node != orig) | |
492 | { | |
493 | struct cgraph_edge *edge = cgraph_edge (node, old_stmt); | |
494 | if (edge) | |
495 | cgraph_set_call_stmt (edge, new_stmt); | |
496 | if (node->clones) | |
497 | node = node->clones; | |
498 | else if (node->next_sibling_clone) | |
499 | node = node->next_sibling_clone; | |
500 | else | |
501 | { | |
502 | while (node != orig && !node->next_sibling_clone) | |
503 | node = node->clone_of; | |
504 | if (node != orig) | |
505 | node = node->next_sibling_clone; | |
506 | } | |
507 | } | |
508 | } | |
509 | ||
510 | /* Like cgraph_create_edge walk the clone tree and update all clones sharing | |
511 | same function body. If clones already have edge for OLD_STMT; only | |
512 | update the edge same way as cgraph_set_call_stmt_including_clones does. | |
513 | ||
514 | TODO: COUNT and LOOP_DEPTH should be properly distributed based on relative | |
515 | frequencies of the clones. */ | |
516 | ||
517 | void | |
518 | cgraph_create_edge_including_clones (struct cgraph_node *orig, | |
519 | struct cgraph_node *callee, | |
520 | gimple old_stmt, | |
521 | gimple stmt, gcov_type count, | |
522 | int freq, | |
523 | cgraph_inline_failed_t reason) | |
524 | { | |
525 | struct cgraph_node *node; | |
526 | struct cgraph_edge *edge; | |
527 | ||
528 | if (!cgraph_edge (orig, stmt)) | |
529 | { | |
530 | edge = cgraph_create_edge (orig, callee, stmt, count, freq); | |
531 | edge->inline_failed = reason; | |
532 | } | |
533 | ||
534 | node = orig->clones; | |
535 | if (node) | |
536 | while (node != orig) | |
537 | { | |
538 | struct cgraph_edge *edge = cgraph_edge (node, old_stmt); | |
539 | ||
540 | /* It is possible that clones already contain the edge while | |
541 | master didn't. Either we promoted indirect call into direct | |
542 | call in the clone or we are processing clones of unreachable | |
543 | master where edges has been removed. */ | |
544 | if (edge) | |
545 | cgraph_set_call_stmt (edge, stmt); | |
546 | else if (!cgraph_edge (node, stmt)) | |
547 | { | |
548 | edge = cgraph_create_edge (node, callee, stmt, count, | |
549 | freq); | |
550 | edge->inline_failed = reason; | |
551 | } | |
552 | ||
553 | if (node->clones) | |
554 | node = node->clones; | |
555 | else if (node->next_sibling_clone) | |
556 | node = node->next_sibling_clone; | |
557 | else | |
558 | { | |
559 | while (node != orig && !node->next_sibling_clone) | |
560 | node = node->clone_of; | |
561 | if (node != orig) | |
562 | node = node->next_sibling_clone; | |
563 | } | |
564 | } | |
565 | } | |
566 | ||
567 | /* Remove the node from cgraph and all inline clones inlined into it. | |
568 | Skip however removal of FORBIDDEN_NODE and return true if it needs to be | |
569 | removed. This allows to call the function from outer loop walking clone | |
570 | tree. */ | |
571 | ||
572 | bool | |
573 | cgraph_remove_node_and_inline_clones (struct cgraph_node *node, struct cgraph_node *forbidden_node) | |
574 | { | |
575 | struct cgraph_edge *e, *next; | |
576 | bool found = false; | |
577 | ||
578 | if (node == forbidden_node) | |
39f9719e JH |
579 | { |
580 | cgraph_remove_edge (node->callers); | |
581 | return true; | |
582 | } | |
564fe867 JH |
583 | for (e = node->callees; e; e = next) |
584 | { | |
585 | next = e->next_callee; | |
586 | if (!e->inline_failed) | |
587 | found |= cgraph_remove_node_and_inline_clones (e->callee, forbidden_node); | |
588 | } | |
589 | cgraph_remove_node (node); | |
590 | return found; | |
591 | } | |
592 | ||
593 | /* The edges representing the callers of the NEW_VERSION node were | |
594 | fixed by cgraph_function_versioning (), now the call_expr in their | |
595 | respective tree code should be updated to call the NEW_VERSION. */ | |
596 | ||
597 | static void | |
598 | update_call_expr (struct cgraph_node *new_version) | |
599 | { | |
600 | struct cgraph_edge *e; | |
601 | ||
602 | gcc_assert (new_version); | |
603 | ||
604 | /* Update the call expr on the edges to call the new version. */ | |
605 | for (e = new_version->callers; e; e = e->next_caller) | |
606 | { | |
607 | struct function *inner_function = DECL_STRUCT_FUNCTION (e->caller->symbol.decl); | |
608 | gimple_call_set_fndecl (e->call_stmt, new_version->symbol.decl); | |
609 | maybe_clean_eh_stmt_fn (inner_function, e->call_stmt); | |
610 | } | |
611 | } | |
612 | ||
613 | ||
614 | /* Create a new cgraph node which is the new version of | |
615 | OLD_VERSION node. REDIRECT_CALLERS holds the callers | |
616 | edges which should be redirected to point to | |
617 | NEW_VERSION. ALL the callees edges of OLD_VERSION | |
618 | are cloned to the new version node. Return the new | |
619 | version node. | |
620 | ||
621 | If non-NULL BLOCK_TO_COPY determine what basic blocks | |
622 | was copied to prevent duplications of calls that are dead | |
623 | in the clone. */ | |
624 | ||
625 | struct cgraph_node * | |
626 | cgraph_copy_node_for_versioning (struct cgraph_node *old_version, | |
627 | tree new_decl, | |
9771b263 | 628 | vec<cgraph_edge_p> redirect_callers, |
564fe867 JH |
629 | bitmap bbs_to_copy) |
630 | { | |
631 | struct cgraph_node *new_version; | |
632 | struct cgraph_edge *e; | |
633 | unsigned i; | |
634 | ||
635 | gcc_assert (old_version); | |
636 | ||
637 | new_version = cgraph_create_node (new_decl); | |
638 | ||
e70670cf JH |
639 | new_version->symbol.analyzed = old_version->symbol.analyzed; |
640 | new_version->symbol.definition = old_version->symbol.definition; | |
564fe867 JH |
641 | new_version->local = old_version->local; |
642 | new_version->symbol.externally_visible = false; | |
e70670cf | 643 | new_version->local.local = new_version->symbol.definition; |
564fe867 JH |
644 | new_version->global = old_version->global; |
645 | new_version->rtl = old_version->rtl; | |
646 | new_version->count = old_version->count; | |
647 | ||
648 | for (e = old_version->callees; e; e=e->next_callee) | |
649 | if (!bbs_to_copy | |
650 | || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) | |
651 | cgraph_clone_edge (e, new_version, e->call_stmt, | |
652 | e->lto_stmt_uid, REG_BR_PROB_BASE, | |
653 | CGRAPH_FREQ_BASE, | |
654 | true); | |
655 | for (e = old_version->indirect_calls; e; e=e->next_callee) | |
656 | if (!bbs_to_copy | |
657 | || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) | |
658 | cgraph_clone_edge (e, new_version, e->call_stmt, | |
659 | e->lto_stmt_uid, REG_BR_PROB_BASE, | |
660 | CGRAPH_FREQ_BASE, | |
661 | true); | |
9771b263 | 662 | FOR_EACH_VEC_ELT (redirect_callers, i, e) |
564fe867 JH |
663 | { |
664 | /* Redirect calls to the old version node to point to its new | |
665 | version. */ | |
666 | cgraph_redirect_edge_callee (e, new_version); | |
667 | } | |
668 | ||
669 | cgraph_call_node_duplication_hooks (old_version, new_version); | |
670 | ||
671 | return new_version; | |
672 | } | |
673 | ||
674 | /* Perform function versioning. | |
675 | Function versioning includes copying of the tree and | |
676 | a callgraph update (creating a new cgraph node and updating | |
677 | its callees and callers). | |
678 | ||
679 | REDIRECT_CALLERS varray includes the edges to be redirected | |
680 | to the new version. | |
681 | ||
682 | TREE_MAP is a mapping of tree nodes we want to replace with | |
683 | new ones (according to results of prior analysis). | |
684 | OLD_VERSION_NODE is the node that is versioned. | |
685 | ||
686 | If non-NULL ARGS_TO_SKIP determine function parameters to remove | |
687 | from new version. | |
688 | If SKIP_RETURN is true, the new version will return void. | |
689 | If non-NULL BLOCK_TO_COPY determine what basic blocks to copy. | |
690 | If non_NULL NEW_ENTRY determine new entry BB of the clone. | |
691 | ||
692 | Return the new version's cgraph node. */ | |
693 | ||
694 | struct cgraph_node * | |
695 | cgraph_function_versioning (struct cgraph_node *old_version_node, | |
9771b263 DN |
696 | vec<cgraph_edge_p> redirect_callers, |
697 | vec<ipa_replace_map_p, va_gc> *tree_map, | |
564fe867 JH |
698 | bitmap args_to_skip, |
699 | bool skip_return, | |
700 | bitmap bbs_to_copy, | |
701 | basic_block new_entry_block, | |
702 | const char *clone_name) | |
703 | { | |
704 | tree old_decl = old_version_node->symbol.decl; | |
705 | struct cgraph_node *new_version_node = NULL; | |
706 | tree new_decl; | |
707 | ||
708 | if (!tree_versionable_function_p (old_decl)) | |
709 | return NULL; | |
710 | ||
711 | gcc_assert (old_version_node->local.can_change_signature || !args_to_skip); | |
712 | ||
713 | /* Make a new FUNCTION_DECL tree node for the new version. */ | |
714 | if (!args_to_skip && !skip_return) | |
715 | new_decl = copy_node (old_decl); | |
716 | else | |
717 | new_decl | |
718 | = build_function_decl_skip_args (old_decl, args_to_skip, skip_return); | |
719 | ||
720 | /* Generate a new name for the new version. */ | |
721 | DECL_NAME (new_decl) = clone_function_name (old_decl, clone_name); | |
722 | SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl)); | |
723 | SET_DECL_RTL (new_decl, NULL); | |
724 | ||
725 | /* When the old decl was a con-/destructor make sure the clone isn't. */ | |
726 | DECL_STATIC_CONSTRUCTOR(new_decl) = 0; | |
727 | DECL_STATIC_DESTRUCTOR(new_decl) = 0; | |
728 | ||
729 | /* Create the new version's call-graph node. | |
730 | and update the edges of the new node. */ | |
731 | new_version_node = | |
732 | cgraph_copy_node_for_versioning (old_version_node, new_decl, | |
733 | redirect_callers, bbs_to_copy); | |
734 | ||
735 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
736 | tree_function_versioning (old_decl, new_decl, tree_map, false, args_to_skip, | |
737 | skip_return, bbs_to_copy, new_entry_block); | |
738 | ||
739 | /* Update the new version's properties. | |
740 | Make The new version visible only within this translation unit. Make sure | |
741 | that is not weak also. | |
742 | ??? We cannot use COMDAT linkage because there is no | |
743 | ABI support for this. */ | |
744 | symtab_make_decl_local (new_version_node->symbol.decl); | |
745 | DECL_VIRTUAL_P (new_version_node->symbol.decl) = 0; | |
746 | new_version_node->symbol.externally_visible = 0; | |
747 | new_version_node->local.local = 1; | |
748 | new_version_node->lowered = true; | |
702d8703 JH |
749 | /* Clones of global symbols or symbols with unique names are unique. */ |
750 | if ((TREE_PUBLIC (old_decl) | |
751 | && !DECL_EXTERNAL (old_decl) | |
752 | && !DECL_WEAK (old_decl) | |
753 | && !DECL_COMDAT (old_decl)) | |
754 | || in_lto_p) | |
755 | new_version_node->symbol.unique_name = true; | |
564fe867 JH |
756 | |
757 | /* Update the call_expr on the edges to call the new version node. */ | |
758 | update_call_expr (new_version_node); | |
759 | ||
760 | cgraph_call_function_insertion_hooks (new_version_node); | |
761 | return new_version_node; | |
762 | } | |
763 | ||
764 | /* Given virtual clone, turn it into actual clone. */ | |
765 | ||
766 | static void | |
767 | cgraph_materialize_clone (struct cgraph_node *node) | |
768 | { | |
769 | bitmap_obstack_initialize (NULL); | |
770 | node->former_clone_of = node->clone_of->symbol.decl; | |
771 | if (node->clone_of->former_clone_of) | |
772 | node->former_clone_of = node->clone_of->former_clone_of; | |
773 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
774 | tree_function_versioning (node->clone_of->symbol.decl, node->symbol.decl, | |
775 | node->clone.tree_map, true, | |
776 | node->clone.args_to_skip, false, | |
777 | NULL, NULL); | |
778 | if (cgraph_dump_file) | |
779 | { | |
780 | dump_function_to_file (node->clone_of->symbol.decl, cgraph_dump_file, dump_flags); | |
781 | dump_function_to_file (node->symbol.decl, cgraph_dump_file, dump_flags); | |
782 | } | |
783 | ||
784 | /* Function is no longer clone. */ | |
785 | if (node->next_sibling_clone) | |
786 | node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone; | |
787 | if (node->prev_sibling_clone) | |
788 | node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone; | |
789 | else | |
790 | node->clone_of->clones = node->next_sibling_clone; | |
791 | node->next_sibling_clone = NULL; | |
792 | node->prev_sibling_clone = NULL; | |
e70670cf | 793 | if (!node->clone_of->symbol.analyzed && !node->clone_of->clones) |
564fe867 JH |
794 | { |
795 | cgraph_release_function_body (node->clone_of); | |
796 | cgraph_node_remove_callees (node->clone_of); | |
797 | ipa_remove_all_references (&node->clone_of->symbol.ref_list); | |
798 | } | |
799 | node->clone_of = NULL; | |
800 | bitmap_obstack_release (NULL); | |
801 | } | |
802 | ||
803 | /* Once all functions from compilation unit are in memory, produce all clones | |
804 | and update all calls. We might also do this on demand if we don't want to | |
805 | bring all functions to memory prior compilation, but current WHOPR | |
806 | implementation does that and it is is bit easier to keep everything right in | |
807 | this order. */ | |
808 | ||
809 | void | |
810 | cgraph_materialize_all_clones (void) | |
811 | { | |
812 | struct cgraph_node *node; | |
813 | bool stabilized = false; | |
814 | ||
815 | if (cgraph_dump_file) | |
816 | fprintf (cgraph_dump_file, "Materializing clones\n"); | |
817 | #ifdef ENABLE_CHECKING | |
818 | verify_cgraph (); | |
819 | #endif | |
820 | ||
821 | /* We can also do topological order, but number of iterations should be | |
822 | bounded by number of IPA passes since single IPA pass is probably not | |
823 | going to create clones of clones it created itself. */ | |
824 | while (!stabilized) | |
825 | { | |
826 | stabilized = true; | |
827 | FOR_EACH_FUNCTION (node) | |
828 | { | |
829 | if (node->clone_of && node->symbol.decl != node->clone_of->symbol.decl | |
830 | && !gimple_has_body_p (node->symbol.decl)) | |
831 | { | |
832 | if (gimple_has_body_p (node->clone_of->symbol.decl)) | |
833 | { | |
834 | if (cgraph_dump_file) | |
835 | { | |
836 | fprintf (cgraph_dump_file, "cloning %s to %s\n", | |
837 | xstrdup (cgraph_node_name (node->clone_of)), | |
838 | xstrdup (cgraph_node_name (node))); | |
839 | if (node->clone.tree_map) | |
840 | { | |
841 | unsigned int i; | |
842 | fprintf (cgraph_dump_file, " replace map: "); | |
9771b263 DN |
843 | for (i = 0; |
844 | i < vec_safe_length (node->clone.tree_map); | |
845 | i++) | |
564fe867 JH |
846 | { |
847 | struct ipa_replace_map *replace_info; | |
9771b263 | 848 | replace_info = (*node->clone.tree_map)[i]; |
564fe867 JH |
849 | print_generic_expr (cgraph_dump_file, replace_info->old_tree, 0); |
850 | fprintf (cgraph_dump_file, " -> "); | |
851 | print_generic_expr (cgraph_dump_file, replace_info->new_tree, 0); | |
852 | fprintf (cgraph_dump_file, "%s%s;", | |
853 | replace_info->replace_p ? "(replace)":"", | |
854 | replace_info->ref_p ? "(ref)":""); | |
855 | } | |
856 | fprintf (cgraph_dump_file, "\n"); | |
857 | } | |
858 | if (node->clone.args_to_skip) | |
859 | { | |
860 | fprintf (cgraph_dump_file, " args_to_skip: "); | |
861 | dump_bitmap (cgraph_dump_file, node->clone.args_to_skip); | |
862 | } | |
863 | if (node->clone.args_to_skip) | |
864 | { | |
865 | fprintf (cgraph_dump_file, " combined_args_to_skip:"); | |
866 | dump_bitmap (cgraph_dump_file, node->clone.combined_args_to_skip); | |
867 | } | |
868 | } | |
869 | cgraph_materialize_clone (node); | |
870 | stabilized = false; | |
871 | } | |
872 | } | |
873 | } | |
874 | } | |
875 | FOR_EACH_FUNCTION (node) | |
e70670cf | 876 | if (!node->symbol.analyzed && node->callees) |
564fe867 JH |
877 | cgraph_node_remove_callees (node); |
878 | if (cgraph_dump_file) | |
879 | fprintf (cgraph_dump_file, "Materialization Call site updates done.\n"); | |
880 | #ifdef ENABLE_CHECKING | |
881 | verify_cgraph (); | |
882 | #endif | |
04142cc3 | 883 | symtab_remove_unreachable_nodes (false, cgraph_dump_file); |
564fe867 JH |
884 | } |
885 | ||
886 | #include "gt-cgraphclones.h" |