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ea900239 | 1 | /* Callgraph based analysis of static variables. |
5624e564 | 2 | Copyright (C) 2004-2015 Free Software Foundation, Inc. |
ea900239 DB |
3 | Contributed by Kenneth Zadeck <zadeck@naturalbridge.com> |
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 | |
9dcd6f09 | 9 | Software Foundation; either version 3, or (at your option) any later |
ea900239 DB |
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 | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
ea900239 DB |
20 | |
21 | /* This file gathers information about how variables whose scope is | |
b8698a0f | 22 | confined to the compilation unit are used. |
ea900239 | 23 | |
4a444e58 | 24 | The transitive call site specific clobber effects are computed |
ea900239 DB |
25 | for the variables whose scope is contained within this compilation |
26 | unit. | |
27 | ||
28 | First each function and static variable initialization is analyzed | |
29 | to determine which local static variables are either read, written, | |
30 | or have their address taken. Any local static that has its address | |
31 | taken is removed from consideration. Once the local read and | |
32 | writes are determined, a transitive closure of this information is | |
33 | performed over the call graph to determine the worst case set of | |
34 | side effects of each call. In later parts of the compiler, these | |
35 | local and global sets are examined to make the call clobbering less | |
36 | traumatic, promote some statics to registers, and improve aliasing | |
4a444e58 | 37 | information. */ |
ea900239 DB |
38 | |
39 | #include "config.h" | |
40 | #include "system.h" | |
41 | #include "coretypes.h" | |
42 | #include "tm.h" | |
43 | #include "tree.h" | |
d8a2d370 | 44 | #include "calls.h" |
60393bbc AM |
45 | #include "predict.h" |
46 | #include "vec.h" | |
47 | #include "hashtab.h" | |
48 | #include "hash-set.h" | |
49 | #include "machmode.h" | |
50 | #include "hard-reg-set.h" | |
51 | #include "input.h" | |
52 | #include "function.h" | |
2fb9a547 AM |
53 | #include "basic-block.h" |
54 | #include "tree-ssa-alias.h" | |
55 | #include "internal-fn.h" | |
56 | #include "gimple-expr.h" | |
57 | #include "is-a.h" | |
8e9055ae | 58 | #include "gimple.h" |
ea900239 DB |
59 | #include "tree-inline.h" |
60 | #include "tree-pass.h" | |
ea264ca5 | 61 | #include "splay-tree.h" |
c582198b AM |
62 | #include "hash-map.h" |
63 | #include "plugin-api.h" | |
64 | #include "ipa-ref.h" | |
65 | #include "cgraph.h" | |
ea900239 | 66 | #include "ipa-utils.h" |
c582198b | 67 | #include "bitmap.h" |
ea900239 | 68 | #include "ipa-reference.h" |
ea900239 | 69 | #include "flags.h" |
ea900239 | 70 | #include "diagnostic.h" |
412288f1 | 71 | #include "data-streamer.h" |
d7f09764 DN |
72 | #include "lto-streamer.h" |
73 | ||
d7f09764 DN |
74 | static void remove_node_data (struct cgraph_node *node, |
75 | void *data ATTRIBUTE_UNUSED); | |
76 | static void duplicate_node_data (struct cgraph_node *src, | |
77 | struct cgraph_node *dst, | |
78 | void *data ATTRIBUTE_UNUSED); | |
ea900239 | 79 | |
e2c9111c | 80 | /* The static variables defined within the compilation unit that are |
b8698a0f | 81 | loaded or stored directly by function that owns this structure. */ |
e2c9111c | 82 | |
b8698a0f | 83 | struct ipa_reference_local_vars_info_d |
e2c9111c JH |
84 | { |
85 | bitmap statics_read; | |
86 | bitmap statics_written; | |
e2c9111c JH |
87 | }; |
88 | ||
89 | /* Statics that are read and written by some set of functions. The | |
90 | local ones are based on the loads and stores local to the function. | |
91 | The global ones are based on the local info as well as the | |
46c30019 | 92 | transitive closure of the functions that are called. */ |
e2c9111c JH |
93 | |
94 | struct ipa_reference_global_vars_info_d | |
95 | { | |
96 | bitmap statics_read; | |
97 | bitmap statics_written; | |
46c30019 JH |
98 | }; |
99 | ||
61502ca8 | 100 | /* Information we save about every function after ipa-reference is completed. */ |
46c30019 JH |
101 | |
102 | struct ipa_reference_optimization_summary_d | |
103 | { | |
e2c9111c JH |
104 | bitmap statics_not_read; |
105 | bitmap statics_not_written; | |
106 | }; | |
107 | ||
108 | typedef struct ipa_reference_local_vars_info_d *ipa_reference_local_vars_info_t; | |
109 | typedef struct ipa_reference_global_vars_info_d *ipa_reference_global_vars_info_t; | |
46c30019 JH |
110 | typedef struct ipa_reference_optimization_summary_d *ipa_reference_optimization_summary_t; |
111 | ||
b8698a0f | 112 | struct ipa_reference_vars_info_d |
e2c9111c | 113 | { |
46c30019 JH |
114 | struct ipa_reference_local_vars_info_d local; |
115 | struct ipa_reference_global_vars_info_d global; | |
e2c9111c JH |
116 | }; |
117 | ||
118 | typedef struct ipa_reference_vars_info_d *ipa_reference_vars_info_t; | |
119 | ||
ea900239 | 120 | /* This splay tree contains all of the static variables that are |
46c30019 JH |
121 | being considered by the compilation level alias analysis. */ |
122 | static splay_tree reference_vars_to_consider; | |
ea900239 | 123 | |
df92c640 SB |
124 | /* Set of all interesting module statics. A bit is set for every module |
125 | static we are considering. This is added to the local info when asm | |
126 | code is found that clobbers all memory. */ | |
ea900239 DB |
127 | static bitmap all_module_statics; |
128 | ||
ebcf9dc8 JH |
129 | /* Obstack holding bitmaps of local analysis (live from analysis to |
130 | propagation) */ | |
131 | static bitmap_obstack local_info_obstack; | |
132 | /* Obstack holding global analysis live forever. */ | |
46c30019 | 133 | static bitmap_obstack optimization_summary_obstack; |
ea900239 | 134 | |
129a37fc | 135 | /* Holders of ipa cgraph hooks: */ |
e2c9111c JH |
136 | static struct cgraph_2node_hook_list *node_duplication_hook_holder; |
137 | static struct cgraph_node_hook_list *node_removal_hook_holder; | |
129a37fc | 138 | |
df92c640 SB |
139 | /* Vector where the reference var infos are actually stored. |
140 | Indexed by UID of call graph nodes. */ | |
9771b263 | 141 | static vec<ipa_reference_vars_info_t> ipa_reference_vars_vector; |
df92c640 | 142 | |
9771b263 | 143 | static vec<ipa_reference_optimization_summary_t> ipa_reference_opt_sum_vector; |
e2c9111c | 144 | |
ea900239 DB |
145 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
146 | static inline ipa_reference_vars_info_t | |
e2c9111c JH |
147 | get_reference_vars_info (struct cgraph_node *node) |
148 | { | |
9771b263 DN |
149 | if (!ipa_reference_vars_vector.exists () |
150 | || ipa_reference_vars_vector.length () <= (unsigned int) node->uid) | |
e2c9111c | 151 | return NULL; |
9771b263 | 152 | return ipa_reference_vars_vector[node->uid]; |
e2c9111c JH |
153 | } |
154 | ||
155 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ | |
46c30019 JH |
156 | static inline ipa_reference_optimization_summary_t |
157 | get_reference_optimization_summary (struct cgraph_node *node) | |
ea900239 | 158 | { |
9771b263 DN |
159 | if (!ipa_reference_opt_sum_vector.exists () |
160 | || (ipa_reference_opt_sum_vector.length () <= (unsigned int) node->uid)) | |
ea900239 | 161 | return NULL; |
9771b263 | 162 | return ipa_reference_opt_sum_vector[node->uid]; |
ea900239 DB |
163 | } |
164 | ||
46c30019 JH |
165 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
166 | static inline void | |
167 | set_reference_vars_info (struct cgraph_node *node, | |
168 | ipa_reference_vars_info_t info) | |
ea900239 | 169 | { |
9771b263 DN |
170 | if (!ipa_reference_vars_vector.exists () |
171 | || ipa_reference_vars_vector.length () <= (unsigned int) node->uid) | |
172 | ipa_reference_vars_vector.safe_grow_cleared (node->uid + 1); | |
173 | ipa_reference_vars_vector[node->uid] = info; | |
ea900239 DB |
174 | } |
175 | ||
46c30019 JH |
176 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
177 | static inline void | |
178 | set_reference_optimization_summary (struct cgraph_node *node, | |
179 | ipa_reference_optimization_summary_t info) | |
ea900239 | 180 | { |
9771b263 DN |
181 | if (!ipa_reference_opt_sum_vector.exists () |
182 | || (ipa_reference_opt_sum_vector.length () <= (unsigned int) node->uid)) | |
183 | ipa_reference_opt_sum_vector.safe_grow_cleared (node->uid + 1); | |
184 | ipa_reference_opt_sum_vector[node->uid] = info; | |
ea900239 DB |
185 | } |
186 | ||
df92c640 SB |
187 | /* Return a bitmap indexed by DECL_UID for the static variables that |
188 | are *not* read during the execution of the function FN. Returns | |
ea900239 DB |
189 | NULL if no data is available. */ |
190 | ||
b8698a0f L |
191 | bitmap |
192 | ipa_reference_get_not_read_global (struct cgraph_node *fn) | |
ea900239 | 193 | { |
df92c640 | 194 | ipa_reference_optimization_summary_t info = |
d52f5295 | 195 | get_reference_optimization_summary (fn->function_symbol (NULL)); |
46c30019 JH |
196 | if (info) |
197 | return info->statics_not_read; | |
67348ccc | 198 | else if (flags_from_decl_or_type (fn->decl) & ECF_LEAF) |
46a4da10 | 199 | return all_module_statics; |
ea900239 DB |
200 | else |
201 | return NULL; | |
202 | } | |
203 | ||
df92c640 SB |
204 | /* Return a bitmap indexed by DECL_UID for the static variables that |
205 | are *not* written during the execution of the function FN. Note | |
ea900239 DB |
206 | that variables written may or may not be read during the function |
207 | call. Returns NULL if no data is available. */ | |
208 | ||
b8698a0f L |
209 | bitmap |
210 | ipa_reference_get_not_written_global (struct cgraph_node *fn) | |
ea900239 | 211 | { |
df92c640 SB |
212 | ipa_reference_optimization_summary_t info = |
213 | get_reference_optimization_summary (fn); | |
46c30019 JH |
214 | if (info) |
215 | return info->statics_not_written; | |
67348ccc | 216 | else if (flags_from_decl_or_type (fn->decl) & ECF_LEAF) |
46a4da10 | 217 | return all_module_statics; |
ea900239 DB |
218 | else |
219 | return NULL; | |
220 | } | |
221 | ||
222 | \f | |
223 | ||
224 | /* Add VAR to all_module_statics and the two | |
225 | reference_vars_to_consider* sets. */ | |
226 | ||
b8698a0f L |
227 | static inline void |
228 | add_static_var (tree var) | |
ea900239 DB |
229 | { |
230 | int uid = DECL_UID (var); | |
ebcf9dc8 | 231 | gcc_assert (TREE_CODE (var) == VAR_DECL); |
df24c2b8 JH |
232 | if (dump_file) |
233 | splay_tree_insert (reference_vars_to_consider, | |
234 | uid, (splay_tree_value)var); | |
235 | bitmap_set_bit (all_module_statics, uid); | |
ea900239 DB |
236 | } |
237 | ||
238 | /* Return true if the variable T is the right kind of static variable to | |
239 | perform compilation unit scope escape analysis. */ | |
240 | ||
b8698a0f | 241 | static inline bool |
5f902d76 | 242 | is_proper_for_analysis (tree t) |
ea900239 DB |
243 | { |
244 | /* If the variable has the "used" attribute, treat it as if it had a | |
245 | been touched by the devil. */ | |
b42186f1 | 246 | if (DECL_PRESERVE_P (t)) |
ea900239 DB |
247 | return false; |
248 | ||
249 | /* Do not want to do anything with volatile except mark any | |
250 | function that uses one to be not const or pure. */ | |
b8698a0f | 251 | if (TREE_THIS_VOLATILE (t)) |
ea900239 DB |
252 | return false; |
253 | ||
22a8d1e6 JH |
254 | /* We do not need to analyze readonly vars, we already know they do not |
255 | alias. */ | |
256 | if (TREE_READONLY (t)) | |
257 | return false; | |
258 | ||
1685ecf3 JH |
259 | /* We can not track variables with address taken. */ |
260 | if (TREE_ADDRESSABLE (t)) | |
261 | return false; | |
262 | ||
263 | /* TODO: We could track public variables that are not addressable, but currently | |
264 | frontends don't give us those. */ | |
265 | if (TREE_PUBLIC (t)) | |
266 | return false; | |
267 | ||
268 | /* TODO: Check aliases. */ | |
269 | ||
ea900239 DB |
270 | /* This is a variable we care about. Check if we have seen it |
271 | before, and if not add it the set of variables we care about. */ | |
f3380641 JH |
272 | if (all_module_statics |
273 | && !bitmap_bit_p (all_module_statics, DECL_UID (t))) | |
ea900239 DB |
274 | add_static_var (t); |
275 | ||
276 | return true; | |
277 | } | |
278 | ||
ea900239 | 279 | /* Lookup the tree node for the static variable that has UID and |
a4174ebf | 280 | convert the name to a string for debugging. */ |
ea900239 DB |
281 | |
282 | static const char * | |
283 | get_static_name (int index) | |
284 | { | |
b8698a0f | 285 | splay_tree_node stn = |
ea900239 | 286 | splay_tree_lookup (reference_vars_to_consider, index); |
df92c640 SB |
287 | return fndecl_name ((tree)(stn->value)); |
288 | } | |
289 | ||
290 | /* Dump a set of static vars to FILE. */ | |
291 | static void | |
292 | dump_static_vars_set_to_file (FILE *f, bitmap set) | |
293 | { | |
294 | unsigned int index; | |
295 | bitmap_iterator bi; | |
296 | if (set == NULL) | |
297 | return; | |
298 | else if (set == all_module_statics) | |
299 | fprintf (f, "ALL"); | |
300 | else | |
301 | EXECUTE_IF_SET_IN_BITMAP (set, 0, index, bi) | |
302 | { | |
303 | fprintf (f, "%s ", get_static_name (index)); | |
304 | } | |
305 | } | |
306 | ||
307 | /* Compute X |= Y, taking into account the possibility that | |
308 | either X or Y is already the maximum set. | |
309 | Return true if X is the maximum set after taking the union with Y. */ | |
310 | ||
311 | static bool | |
312 | union_static_var_sets (bitmap &x, bitmap y) | |
313 | { | |
314 | if (x != all_module_statics) | |
315 | { | |
316 | if (y == all_module_statics) | |
317 | { | |
318 | BITMAP_FREE (x); | |
319 | x = all_module_statics; | |
320 | } | |
321 | else if (bitmap_ior_into (x, y)) | |
322 | { | |
323 | /* The union may have reduced X to the maximum set. | |
324 | In that case, we want to make that visible explicitly. | |
325 | Even though bitmap_equal_p can be very expensive, it | |
326 | turns out to be an overall win to check this here for | |
327 | an LTO bootstrap of GCC itself. Liberally extrapoliate | |
328 | that result to be applicable to all cases. */ | |
329 | if (bitmap_equal_p (x, all_module_statics)) | |
330 | { | |
331 | BITMAP_FREE (x); | |
332 | x = all_module_statics; | |
333 | } | |
334 | } | |
335 | } | |
336 | return x == all_module_statics; | |
337 | } | |
338 | ||
df92c640 SB |
339 | /* Return a copy of SET on the bitmap obstack containing SET. |
340 | But if SET is NULL or the maximum set, return that instead. */ | |
341 | ||
342 | static bitmap | |
343 | copy_static_var_set (bitmap set) | |
344 | { | |
345 | if (set == NULL || set == all_module_statics) | |
346 | return set; | |
347 | bitmap_obstack *o = set->obstack; | |
348 | gcc_checking_assert (o); | |
349 | bitmap copy = BITMAP_ALLOC (o); | |
350 | bitmap_copy (copy, set); | |
351 | return copy; | |
352 | } | |
353 | ||
354 | /* Compute the union all of the statics read and written by every callee of X | |
355 | into X_GLOBAL->statics_read and X_GLOBAL->statics_written. X_GLOBAL is | |
356 | actually the set representing the cycle containing X. If the read and | |
357 | written sets of X_GLOBAL has been reduced to the maximum set, we don't | |
358 | have to look at the remaining callees. */ | |
ea900239 DB |
359 | |
360 | static void | |
e2c9111c | 361 | propagate_bits (ipa_reference_global_vars_info_t x_global, struct cgraph_node *x) |
ea900239 | 362 | { |
ea900239 | 363 | struct cgraph_edge *e; |
df92c640 SB |
364 | bool read_all = x_global->statics_read == all_module_statics; |
365 | bool write_all = x_global->statics_written == all_module_statics; | |
366 | for (e = x->callees; | |
367 | e && !(read_all && write_all); | |
368 | e = e->next_callee) | |
ea900239 | 369 | { |
46a4da10 | 370 | enum availability avail; |
d52f5295 | 371 | struct cgraph_node *y = e->callee->function_symbol (&avail); |
fede8efa JH |
372 | if (!y) |
373 | continue; | |
df92c640 | 374 | |
c59f5d1b | 375 | /* Only look into nodes we can propagate something. */ |
67348ccc | 376 | int flags = flags_from_decl_or_type (y->decl); |
d52f5295 ML |
377 | if (avail > AVAIL_INTERPOSABLE |
378 | || (avail == AVAIL_INTERPOSABLE && (flags & ECF_LEAF))) | |
ea900239 | 379 | { |
e2c9111c | 380 | if (get_reference_vars_info (y)) |
ea900239 | 381 | { |
df92c640 | 382 | ipa_reference_vars_info_t y_info = get_reference_vars_info (y); |
46c30019 | 383 | ipa_reference_global_vars_info_t y_global = &y_info->global; |
e2c9111c | 384 | |
df92c640 SB |
385 | /* Calls in the current cycle do not have their global set |
386 | computed yet (but everything else does because we're | |
387 | visiting nodes in topological order). */ | |
46c30019 | 388 | if (!y_global->statics_read) |
e2c9111c | 389 | continue; |
b8698a0f | 390 | |
df92c640 | 391 | /* If the function is const, it reads no memory even if it |
22a8d1e6 JH |
392 | seems so to local analysis. */ |
393 | if (flags & ECF_CONST) | |
394 | continue; | |
395 | ||
df92c640 | 396 | union_static_var_sets (x_global->statics_read, |
ea900239 | 397 | y_global->statics_read); |
b8698a0f | 398 | |
df92c640 SB |
399 | /* If the function is pure, it has no stores even if it |
400 | seems so to local analysis. If we cannot return from | |
401 | the function, we can safely ignore the call. */ | |
22a8d1e6 | 402 | if ((flags & ECF_PURE) |
3dafb85c | 403 | || e->cannot_lead_to_return_p ()) |
22a8d1e6 JH |
404 | continue; |
405 | ||
df92c640 | 406 | union_static_var_sets (x_global->statics_written, |
ea900239 | 407 | y_global->statics_written); |
ea900239 | 408 | } |
b8698a0f | 409 | else |
ebcf9dc8 | 410 | gcc_unreachable (); |
ea900239 DB |
411 | } |
412 | } | |
413 | } | |
414 | ||
3edf64aa DM |
415 | static bool ipa_init_p = false; |
416 | ||
ea900239 DB |
417 | /* The init routine for analyzing global static variable usage. See |
418 | comments at top for description. */ | |
b8698a0f L |
419 | static void |
420 | ipa_init (void) | |
ea900239 | 421 | { |
3edf64aa | 422 | if (ipa_init_p) |
d7f09764 DN |
423 | return; |
424 | ||
3edf64aa | 425 | ipa_init_p = true; |
d7f09764 | 426 | |
46c30019 JH |
427 | if (dump_file) |
428 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
ea900239 | 429 | |
ebcf9dc8 | 430 | bitmap_obstack_initialize (&local_info_obstack); |
46c30019 | 431 | bitmap_obstack_initialize (&optimization_summary_obstack); |
22a8d1e6 | 432 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
7dbca013 | 433 | |
d7f09764 | 434 | node_removal_hook_holder = |
3dafb85c | 435 | symtab->add_cgraph_removal_hook (&remove_node_data, NULL); |
d7f09764 | 436 | node_duplication_hook_holder = |
3dafb85c | 437 | symtab->add_cgraph_duplication_hook (&duplicate_node_data, NULL); |
ea900239 DB |
438 | } |
439 | ||
d7f09764 | 440 | |
812dbce5 | 441 | /* Set up the persistent info for FN. */ |
ea900239 | 442 | |
812dbce5 JH |
443 | static ipa_reference_local_vars_info_t |
444 | init_function_info (struct cgraph_node *fn) | |
ea900239 | 445 | { |
b8698a0f | 446 | ipa_reference_vars_info_t info |
c5274326 | 447 | = XCNEW (struct ipa_reference_vars_info_d); |
ea900239 DB |
448 | |
449 | /* Add the info to the tree's annotation. */ | |
e2c9111c | 450 | set_reference_vars_info (fn, info); |
ea900239 | 451 | |
46c30019 JH |
452 | info->local.statics_read = BITMAP_ALLOC (&local_info_obstack); |
453 | info->local.statics_written = BITMAP_ALLOC (&local_info_obstack); | |
ea900239 | 454 | |
46c30019 | 455 | return &info->local; |
812dbce5 JH |
456 | } |
457 | ||
d7f09764 | 458 | |
812dbce5 JH |
459 | /* This is the main routine for finding the reference patterns for |
460 | global variables within a function FN. */ | |
d7f09764 | 461 | |
812dbce5 JH |
462 | static void |
463 | analyze_function (struct cgraph_node *fn) | |
464 | { | |
8b583a06 | 465 | ipa_reference_local_vars_info_t local; |
d122681a | 466 | struct ipa_ref *ref = NULL; |
5f902d76 JH |
467 | int i; |
468 | tree var; | |
812dbce5 | 469 | |
5f902d76 | 470 | local = init_function_info (fn); |
d122681a | 471 | for (i = 0; fn->iterate_reference (i, ref); i++) |
812dbce5 | 472 | { |
7de90a6c | 473 | if (!is_a <varpool_node *> (ref->referred)) |
5f902d76 | 474 | continue; |
d122681a | 475 | var = ref->referred->decl; |
5264f487 | 476 | if (!is_proper_for_analysis (var)) |
5f902d76 JH |
477 | continue; |
478 | switch (ref->use) | |
812dbce5 | 479 | { |
5f902d76 JH |
480 | case IPA_REF_LOAD: |
481 | bitmap_set_bit (local->statics_read, DECL_UID (var)); | |
482 | break; | |
483 | case IPA_REF_STORE: | |
d122681a | 484 | if (ref->cannot_lead_to_return ()) |
f10ea640 | 485 | break; |
5f902d76 | 486 | bitmap_set_bit (local->statics_written, DECL_UID (var)); |
5f902d76 JH |
487 | break; |
488 | case IPA_REF_ADDR: | |
5f902d76 | 489 | break; |
7d2268ea MJ |
490 | default: |
491 | gcc_unreachable (); | |
812dbce5 | 492 | } |
812dbce5 | 493 | } |
ea900239 | 494 | |
d52f5295 | 495 | if (fn->cannot_return_p ()) |
22a8d1e6 | 496 | bitmap_clear (local->statics_written); |
ea900239 DB |
497 | } |
498 | ||
5f902d76 | 499 | |
e2c9111c JH |
500 | /* Called when new clone is inserted to callgraph late. */ |
501 | ||
502 | static void | |
503 | duplicate_node_data (struct cgraph_node *src, struct cgraph_node *dst, | |
504 | void *data ATTRIBUTE_UNUSED) | |
505 | { | |
46c30019 JH |
506 | ipa_reference_optimization_summary_t ginfo; |
507 | ipa_reference_optimization_summary_t dst_ginfo; | |
e2c9111c | 508 | |
46c30019 | 509 | ginfo = get_reference_optimization_summary (src); |
5f902d76 | 510 | if (!ginfo) |
e2c9111c | 511 | return; |
46c30019 JH |
512 | dst_ginfo = XCNEW (struct ipa_reference_optimization_summary_d); |
513 | set_reference_optimization_summary (dst, dst_ginfo); | |
df92c640 SB |
514 | dst_ginfo->statics_not_read = |
515 | copy_static_var_set (ginfo->statics_not_read); | |
516 | dst_ginfo->statics_not_written = | |
517 | copy_static_var_set (ginfo->statics_not_written); | |
e2c9111c JH |
518 | } |
519 | ||
520 | /* Called when node is removed. */ | |
521 | ||
522 | static void | |
523 | remove_node_data (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
524 | { | |
46c30019 JH |
525 | ipa_reference_optimization_summary_t ginfo; |
526 | ginfo = get_reference_optimization_summary (node); | |
527 | if (ginfo) | |
528 | { | |
529 | if (ginfo->statics_not_read | |
530 | && ginfo->statics_not_read != all_module_statics) | |
531 | BITMAP_FREE (ginfo->statics_not_read); | |
532 | ||
533 | if (ginfo->statics_not_written | |
534 | && ginfo->statics_not_written != all_module_statics) | |
535 | BITMAP_FREE (ginfo->statics_not_written); | |
536 | free (ginfo); | |
537 | set_reference_optimization_summary (node, NULL); | |
538 | } | |
e2c9111c JH |
539 | } |
540 | ||
812dbce5 JH |
541 | /* Analyze each function in the cgraph to see which global or statics |
542 | are read or written. */ | |
543 | ||
b8698a0f | 544 | static void |
812dbce5 | 545 | generate_summary (void) |
ea900239 DB |
546 | { |
547 | struct cgraph_node *node; | |
812dbce5 JH |
548 | unsigned int index; |
549 | bitmap_iterator bi; | |
b8698a0f | 550 | |
ea900239 DB |
551 | ipa_init (); |
552 | ||
5f902d76 | 553 | /* Process all of the functions next. */ |
65c70e6b JH |
554 | FOR_EACH_DEFINED_FUNCTION (node) |
555 | analyze_function (node); | |
ea900239 | 556 | |
812dbce5 | 557 | if (dump_file) |
ea900239 DB |
558 | EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi) |
559 | { | |
df92c640 SB |
560 | fprintf (dump_file, "\nPromotable global:%s (uid=%u)\n", |
561 | get_static_name (index), index); | |
ea900239 | 562 | } |
b8698a0f | 563 | |
ea900239 | 564 | if (dump_file) |
65c70e6b | 565 | FOR_EACH_DEFINED_FUNCTION (node) |
d52f5295 | 566 | if (node->get_availability () >= AVAIL_INTERPOSABLE) |
ea900239 | 567 | { |
ea900239 | 568 | ipa_reference_local_vars_info_t l; |
812dbce5 | 569 | unsigned int index; |
ea900239 | 570 | bitmap_iterator bi; |
b8698a0f | 571 | |
46c30019 | 572 | l = &get_reference_vars_info (node)->local; |
b8698a0f L |
573 | fprintf (dump_file, |
574 | "\nFunction name:%s/%i:", | |
fec39fa6 | 575 | node->asm_name (), node->order); |
ea900239 | 576 | fprintf (dump_file, "\n locals read: "); |
8b583a06 JH |
577 | if (l->statics_read) |
578 | EXECUTE_IF_SET_IN_BITMAP (l->statics_read, | |
579 | 0, index, bi) | |
580 | { | |
581 | fprintf (dump_file, "%s ", | |
582 | get_static_name (index)); | |
583 | } | |
ea900239 | 584 | fprintf (dump_file, "\n locals written: "); |
8b583a06 JH |
585 | if (l->statics_written) |
586 | EXECUTE_IF_SET_IN_BITMAP (l->statics_written, | |
587 | 0, index, bi) | |
588 | { | |
c3284718 | 589 | fprintf (dump_file, "%s ", get_static_name (index)); |
8b583a06 | 590 | } |
ea900239 | 591 | } |
812dbce5 JH |
592 | } |
593 | \f | |
22a8d1e6 | 594 | /* Set READ_ALL/WRITE_ALL based on decl flags of NODE. */ |
46c30019 | 595 | |
c59f5d1b | 596 | static void |
df92c640 SB |
597 | read_write_all_from_decl (struct cgraph_node *node, |
598 | bool &read_all, bool &write_all) | |
c59f5d1b | 599 | { |
67348ccc | 600 | tree decl = node->decl; |
c59f5d1b | 601 | int flags = flags_from_decl_or_type (decl); |
46a4da10 | 602 | if ((flags & ECF_LEAF) |
d52f5295 | 603 | && node->get_availability () <= AVAIL_INTERPOSABLE) |
46a4da10 JH |
604 | ; |
605 | else if (flags & ECF_CONST) | |
c59f5d1b | 606 | ; |
d52f5295 | 607 | else if ((flags & ECF_PURE) || node->cannot_return_p ()) |
46a4da10 | 608 | { |
df92c640 | 609 | read_all = true; |
46a4da10 JH |
610 | if (dump_file && (dump_flags & TDF_DETAILS)) |
611 | fprintf (dump_file, " %s/%i -> read all\n", | |
fec39fa6 | 612 | node->asm_name (), node->order); |
46a4da10 | 613 | } |
c59f5d1b JH |
614 | else |
615 | { | |
616 | /* TODO: To be able to produce sane results, we should also handle | |
46c30019 | 617 | common builtins, in particular throw. */ |
df92c640 SB |
618 | read_all = true; |
619 | write_all = true; | |
46a4da10 JH |
620 | if (dump_file && (dump_flags & TDF_DETAILS)) |
621 | fprintf (dump_file, " %s/%i -> read all, write all\n", | |
fec39fa6 | 622 | node->asm_name (), node->order); |
c59f5d1b JH |
623 | } |
624 | } | |
625 | ||
df92c640 SB |
626 | /* Set READ_ALL/WRITE_ALL based on decl flags of NODE or any member |
627 | in the cycle of NODE. */ | |
628 | ||
629 | static void | |
630 | get_read_write_all_from_node (struct cgraph_node *node, | |
631 | bool &read_all, bool &write_all) | |
632 | { | |
633 | struct cgraph_edge *e, *ie; | |
634 | ||
635 | /* When function is overwritable, we can not assume anything. */ | |
d52f5295 | 636 | if (node->get_availability () <= AVAIL_INTERPOSABLE) |
df92c640 SB |
637 | read_write_all_from_decl (node, read_all, write_all); |
638 | ||
639 | for (e = node->callees; | |
640 | e && !(read_all && write_all); | |
641 | e = e->next_callee) | |
642 | { | |
643 | enum availability avail; | |
d52f5295 | 644 | struct cgraph_node *callee = e->callee->function_symbol (&avail); |
df92c640 | 645 | gcc_checking_assert (callee); |
d52f5295 | 646 | if (avail <= AVAIL_INTERPOSABLE) |
df92c640 SB |
647 | read_write_all_from_decl (callee, read_all, write_all); |
648 | } | |
649 | ||
650 | for (ie = node->indirect_calls; | |
651 | ie && !(read_all && write_all); | |
652 | ie = ie->next_callee) | |
653 | if (!(ie->indirect_info->ecf_flags & ECF_CONST)) | |
654 | { | |
655 | read_all = true; | |
656 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
657 | fprintf (dump_file, " indirect call -> read all\n"); | |
3dafb85c | 658 | if (!ie->cannot_lead_to_return_p () |
df92c640 SB |
659 | && !(ie->indirect_info->ecf_flags & ECF_PURE)) |
660 | { | |
661 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
662 | fprintf (dump_file, " indirect call -> write all\n"); | |
663 | write_all = true; | |
664 | } | |
665 | } | |
666 | } | |
667 | ||
812dbce5 | 668 | /* Produce the global information by preforming a transitive closure |
df92c640 | 669 | on the local information that was produced by ipa_analyze_function. */ |
812dbce5 JH |
670 | |
671 | static unsigned int | |
672 | propagate (void) | |
673 | { | |
674 | struct cgraph_node *node; | |
812dbce5 | 675 | struct cgraph_node **order = |
3dafb85c | 676 | XCNEWVEC (struct cgraph_node *, symtab->cgraph_count); |
af8bca3c | 677 | int order_pos; |
812dbce5 | 678 | int i; |
dea91a66 | 679 | bool remove_p; |
812dbce5 | 680 | |
b8698a0f | 681 | if (dump_file) |
d52f5295 | 682 | cgraph_node::dump_cgraph (dump_file); |
ea900239 | 683 | |
dea91a66 | 684 | remove_p = ipa_discover_readonly_nonaddressable_vars (); |
5f902d76 JH |
685 | generate_summary (); |
686 | ||
073a8998 | 687 | /* Propagate the local information through the call graph to produce |
ea900239 DB |
688 | the global information. All the nodes within a cycle will have |
689 | the same info so we collapse cycles first. Then we can do the | |
690 | propagation in one pass from the leaves to the roots. */ | |
af8bca3c | 691 | order_pos = ipa_reduced_postorder (order, true, true, NULL); |
ea900239 | 692 | if (dump_file) |
af8bca3c | 693 | ipa_print_order (dump_file, "reduced", order, order_pos); |
ea900239 DB |
694 | |
695 | for (i = 0; i < order_pos; i++ ) | |
696 | { | |
df92c640 SB |
697 | unsigned x; |
698 | struct cgraph_node *w; | |
ea900239 | 699 | ipa_reference_vars_info_t node_info; |
46c30019 | 700 | ipa_reference_global_vars_info_t node_g; |
ea900239 | 701 | ipa_reference_local_vars_info_t node_l; |
df92c640 SB |
702 | bool read_all = false; |
703 | bool write_all = false; | |
ea900239 DB |
704 | |
705 | node = order[i]; | |
67348ccc | 706 | if (node->alias) |
71fb4f92 | 707 | continue; |
df92c640 | 708 | |
e2c9111c | 709 | node_info = get_reference_vars_info (node); |
22a8d1e6 | 710 | gcc_assert (node_info); |
df92c640 SB |
711 | node_l = &node_info->local; |
712 | node_g = &node_info->global; | |
46a4da10 JH |
713 | |
714 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
715 | fprintf (dump_file, "Starting cycle with %s/%i\n", | |
fec39fa6 | 716 | node->asm_name (), node->order); |
46a4da10 | 717 | |
d52f5295 | 718 | vec<cgraph_node *> cycle_nodes = ipa_get_nodes_in_cycle (node); |
c59f5d1b | 719 | |
df92c640 | 720 | /* If any node in a cycle is read_all or write_all, they all are. */ |
9771b263 | 721 | FOR_EACH_VEC_ELT (cycle_nodes, x, w) |
ea900239 | 722 | { |
46a4da10 JH |
723 | if (dump_file && (dump_flags & TDF_DETAILS)) |
724 | fprintf (dump_file, " Visiting %s/%i\n", | |
fec39fa6 | 725 | w->asm_name (), w->order); |
df92c640 SB |
726 | get_read_write_all_from_node (w, read_all, write_all); |
727 | if (read_all && write_all) | |
728 | break; | |
ea900239 DB |
729 | } |
730 | ||
df92c640 | 731 | /* Initialized the bitmaps global sets for the reduced node. */ |
b8698a0f | 732 | if (read_all) |
ea900239 | 733 | node_g->statics_read = all_module_statics; |
b8698a0f | 734 | else |
df92c640 | 735 | node_g->statics_read = copy_static_var_set (node_l->statics_read); |
b8698a0f | 736 | if (write_all) |
ea900239 DB |
737 | node_g->statics_written = all_module_statics; |
738 | else | |
df92c640 | 739 | node_g->statics_written = copy_static_var_set (node_l->statics_written); |
ea900239 | 740 | |
df92c640 SB |
741 | /* Merge the sets of this cycle with all sets of callees reached |
742 | from this cycle. */ | |
9771b263 | 743 | FOR_EACH_VEC_ELT (cycle_nodes, x, w) |
ea900239 | 744 | { |
df92c640 SB |
745 | if (read_all && write_all) |
746 | break; | |
747 | ||
748 | if (w != node) | |
749 | { | |
750 | ipa_reference_vars_info_t w_ri = get_reference_vars_info (w); | |
751 | ipa_reference_local_vars_info_t w_l = &w_ri->local; | |
67348ccc | 752 | int flags = flags_from_decl_or_type (w->decl); |
df92c640 SB |
753 | |
754 | if (!(flags & ECF_CONST)) | |
755 | read_all = union_static_var_sets (node_g->statics_read, | |
756 | w_l->statics_read); | |
757 | if (!(flags & ECF_PURE) | |
d52f5295 | 758 | && !w->cannot_return_p ()) |
df92c640 SB |
759 | write_all = union_static_var_sets (node_g->statics_written, |
760 | w_l->statics_written); | |
761 | } | |
762 | ||
e2c9111c | 763 | propagate_bits (node_g, w); |
ea900239 DB |
764 | } |
765 | ||
e2c9111c | 766 | /* All nodes within a cycle have the same global info bitmaps. */ |
9771b263 | 767 | FOR_EACH_VEC_ELT (cycle_nodes, x, w) |
ea900239 | 768 | { |
df92c640 | 769 | ipa_reference_vars_info_t w_ri = get_reference_vars_info (w); |
46c30019 | 770 | w_ri->global = *node_g; |
ea900239 | 771 | } |
df92c640 | 772 | |
9771b263 | 773 | cycle_nodes.release (); |
ea900239 DB |
774 | } |
775 | ||
776 | if (dump_file) | |
777 | { | |
df92c640 | 778 | for (i = 0; i < order_pos; i++) |
ea900239 | 779 | { |
df92c640 SB |
780 | unsigned x; |
781 | struct cgraph_node *w; | |
ea900239 DB |
782 | |
783 | node = order[i]; | |
67348ccc | 784 | if (node->alias) |
71fb4f92 | 785 | continue; |
df92c640 | 786 | |
b8698a0f L |
787 | fprintf (dump_file, |
788 | "\nFunction name:%s/%i:", | |
fec39fa6 | 789 | node->asm_name (), node->order); |
ea900239 | 790 | |
df92c640 SB |
791 | ipa_reference_vars_info_t node_info = get_reference_vars_info (node); |
792 | ipa_reference_global_vars_info_t node_g = &node_info->global; | |
793 | ||
d52f5295 | 794 | vec<cgraph_node *> cycle_nodes = ipa_get_nodes_in_cycle (node); |
9771b263 | 795 | FOR_EACH_VEC_ELT (cycle_nodes, x, w) |
ea900239 | 796 | { |
df92c640 | 797 | ipa_reference_vars_info_t w_ri = get_reference_vars_info (w); |
46c30019 | 798 | ipa_reference_local_vars_info_t w_l = &w_ri->local; |
df92c640 SB |
799 | if (w != node) |
800 | fprintf (dump_file, "\n next cycle: %s/%i ", | |
fec39fa6 | 801 | w->asm_name (), w->order); |
40513dd3 | 802 | fprintf (dump_file, "\n locals read: "); |
df92c640 | 803 | dump_static_vars_set_to_file (dump_file, w_l->statics_read); |
ea900239 | 804 | fprintf (dump_file, "\n locals written: "); |
df92c640 | 805 | dump_static_vars_set_to_file (dump_file, w_l->statics_written); |
ea900239 | 806 | } |
9771b263 | 807 | cycle_nodes.release (); |
df92c640 | 808 | |
ea900239 | 809 | fprintf (dump_file, "\n globals read: "); |
df92c640 | 810 | dump_static_vars_set_to_file (dump_file, node_g->statics_read); |
ea900239 | 811 | fprintf (dump_file, "\n globals written: "); |
df92c640 SB |
812 | dump_static_vars_set_to_file (dump_file, node_g->statics_written); |
813 | fprintf (dump_file, "\n"); | |
ea900239 DB |
814 | } |
815 | } | |
816 | ||
817 | /* Cleanup. */ | |
65c70e6b | 818 | FOR_EACH_DEFINED_FUNCTION (node) |
ea900239 DB |
819 | { |
820 | ipa_reference_vars_info_t node_info; | |
821 | ipa_reference_global_vars_info_t node_g; | |
46c30019 JH |
822 | ipa_reference_optimization_summary_t opt; |
823 | ||
e2c9111c | 824 | node_info = get_reference_vars_info (node); |
67348ccc | 825 | if (!node->alias |
d52f5295 | 826 | && (node->get_availability () > AVAIL_INTERPOSABLE |
67348ccc | 827 | || (flags_from_decl_or_type (node->decl) & ECF_LEAF))) |
46c30019 JH |
828 | { |
829 | node_g = &node_info->global; | |
ea900239 | 830 | |
46c30019 JH |
831 | opt = XCNEW (struct ipa_reference_optimization_summary_d); |
832 | set_reference_optimization_summary (node, opt); | |
ea900239 | 833 | |
46c30019 | 834 | /* Create the complimentary sets. */ |
22a8d1e6 JH |
835 | |
836 | if (bitmap_empty_p (node_g->statics_read)) | |
837 | opt->statics_not_read = all_module_statics; | |
838 | else | |
839 | { | |
840 | opt->statics_not_read | |
841 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
842 | if (node_g->statics_read != all_module_statics) | |
843 | bitmap_and_compl (opt->statics_not_read, | |
844 | all_module_statics, | |
845 | node_g->statics_read); | |
846 | } | |
847 | ||
848 | if (bitmap_empty_p (node_g->statics_written)) | |
849 | opt->statics_not_written = all_module_statics; | |
850 | else | |
851 | { | |
852 | opt->statics_not_written | |
853 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
854 | if (node_g->statics_written != all_module_statics) | |
855 | bitmap_and_compl (opt->statics_not_written, | |
856 | all_module_statics, | |
857 | node_g->statics_written); | |
858 | } | |
46c30019 | 859 | } |
04695783 | 860 | free (node_info); |
46c30019 JH |
861 | } |
862 | ||
af8bca3c | 863 | ipa_free_postorder_info (); |
46c30019 | 864 | free (order); |
b8698a0f | 865 | |
ebcf9dc8 | 866 | bitmap_obstack_release (&local_info_obstack); |
9771b263 | 867 | ipa_reference_vars_vector.release (); |
46c30019 JH |
868 | if (dump_file) |
869 | splay_tree_delete (reference_vars_to_consider); | |
870 | reference_vars_to_consider = NULL; | |
dea91a66 | 871 | return remove_p ? TODO_remove_functions : 0; |
ea900239 DB |
872 | } |
873 | ||
f3380641 JH |
874 | /* Return true if we need to write summary of NODE. */ |
875 | ||
876 | static bool | |
877 | write_node_summary_p (struct cgraph_node *node, | |
f27c1867 | 878 | lto_symtab_encoder_t encoder, |
f3380641 JH |
879 | bitmap ltrans_statics) |
880 | { | |
881 | ipa_reference_optimization_summary_t info; | |
882 | ||
883 | /* See if we have (non-empty) info. */ | |
67348ccc | 884 | if (!node->definition || node->global.inlined_to) |
f3380641 JH |
885 | return false; |
886 | info = get_reference_optimization_summary (node); | |
887 | if (!info || (bitmap_empty_p (info->statics_not_read) | |
888 | && bitmap_empty_p (info->statics_not_written))) | |
889 | return false; | |
890 | ||
891 | /* See if we want to encode it. | |
892 | Encode also referenced functions since constant folding might turn it into | |
893 | a direct call. | |
894 | ||
895 | In future we might also want to include summaries of functions references | |
896 | by initializers of constant variables references in current unit. */ | |
f27c1867 | 897 | if (!reachable_from_this_partition_p (node, encoder) |
d122681a | 898 | && !referenced_from_this_partition_p (node, encoder)) |
f3380641 JH |
899 | return false; |
900 | ||
901 | /* See if the info has non-empty intersections with vars we want to encode. */ | |
902 | if (!bitmap_intersect_p (info->statics_not_read, ltrans_statics) | |
903 | && !bitmap_intersect_p (info->statics_not_written, ltrans_statics)) | |
904 | return false; | |
905 | return true; | |
906 | } | |
907 | ||
22a8d1e6 JH |
908 | /* Stream out BITS<RANS_STATICS as list of decls to OB. |
909 | LTRANS_STATICS_BITCOUNT specify number of bits in LTRANS_STATICS | |
910 | or -1. When it is positive, just output -1 when | |
911 | BITS<RANS_STATICS == BITS<RANS_STATICS. */ | |
f3380641 JH |
912 | |
913 | static void | |
914 | stream_out_bitmap (struct lto_simple_output_block *ob, | |
22a8d1e6 JH |
915 | bitmap bits, bitmap ltrans_statics, |
916 | int ltrans_statics_bitcount) | |
f3380641 | 917 | { |
22a8d1e6 | 918 | int count = 0; |
f3380641 JH |
919 | unsigned int index; |
920 | bitmap_iterator bi; | |
22a8d1e6 JH |
921 | if (bits == all_module_statics) |
922 | { | |
412288f1 | 923 | streamer_write_hwi_stream (ob->main_stream, -1); |
22a8d1e6 JH |
924 | return; |
925 | } | |
f3380641 JH |
926 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) |
927 | count ++; | |
22a8d1e6 JH |
928 | if (count == ltrans_statics_bitcount) |
929 | { | |
412288f1 | 930 | streamer_write_hwi_stream (ob->main_stream, -1); |
22a8d1e6 JH |
931 | return; |
932 | } | |
412288f1 | 933 | streamer_write_hwi_stream (ob->main_stream, count); |
f3380641 JH |
934 | if (!count) |
935 | return; | |
936 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) | |
937 | { | |
938 | tree decl = (tree)splay_tree_lookup (reference_vars_to_consider, index)->value; | |
c3284718 | 939 | lto_output_var_decl_index (ob->decl_state, ob->main_stream, decl); |
f3380641 JH |
940 | } |
941 | } | |
942 | ||
943 | /* Serialize the ipa info for lto. */ | |
944 | ||
945 | static void | |
f27c1867 | 946 | ipa_reference_write_optimization_summary (void) |
f3380641 | 947 | { |
f3380641 JH |
948 | struct lto_simple_output_block *ob |
949 | = lto_create_simple_output_block (LTO_section_ipa_reference); | |
950 | unsigned int count = 0; | |
22a8d1e6 | 951 | int ltrans_statics_bitcount = 0; |
7380e6ef | 952 | lto_symtab_encoder_t encoder = ob->decl_state->symtab_node_encoder; |
f3380641 | 953 | bitmap ltrans_statics = BITMAP_ALLOC (NULL); |
22a8d1e6 | 954 | int i; |
f3380641 JH |
955 | |
956 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
957 | ||
958 | /* See what variables we are interested in. */ | |
7380e6ef | 959 | for (i = 0; i < lto_symtab_encoder_size (encoder); i++) |
22a8d1e6 | 960 | { |
5e20cdc9 | 961 | symtab_node *snode = lto_symtab_encoder_deref (encoder, i); |
7de90a6c | 962 | varpool_node *vnode = dyn_cast <varpool_node *> (snode); |
5d59b5e1 | 963 | if (vnode |
67348ccc | 964 | && bitmap_bit_p (all_module_statics, DECL_UID (vnode->decl)) |
d122681a | 965 | && referenced_from_this_partition_p (vnode, encoder)) |
22a8d1e6 | 966 | { |
67348ccc | 967 | tree decl = vnode->decl; |
22a8d1e6 JH |
968 | bitmap_set_bit (ltrans_statics, DECL_UID (decl)); |
969 | splay_tree_insert (reference_vars_to_consider, | |
970 | DECL_UID (decl), (splay_tree_value)decl); | |
971 | ltrans_statics_bitcount ++; | |
972 | } | |
973 | } | |
f3380641 | 974 | |
22a8d1e6 JH |
975 | |
976 | if (ltrans_statics_bitcount) | |
7380e6ef | 977 | for (i = 0; i < lto_symtab_encoder_size (encoder); i++) |
5d59b5e1 | 978 | { |
5e20cdc9 | 979 | symtab_node *snode = lto_symtab_encoder_deref (encoder, i); |
7de90a6c | 980 | cgraph_node *cnode = dyn_cast <cgraph_node *> (snode); |
5d59b5e1 | 981 | if (cnode && write_node_summary_p (cnode, encoder, ltrans_statics)) |
22a8d1e6 | 982 | count++; |
5d59b5e1 | 983 | } |
f3380641 | 984 | |
412288f1 | 985 | streamer_write_uhwi_stream (ob->main_stream, count); |
22a8d1e6 JH |
986 | if (count) |
987 | stream_out_bitmap (ob, ltrans_statics, ltrans_statics, | |
988 | -1); | |
f3380641 JH |
989 | |
990 | /* Process all of the functions. */ | |
22a8d1e6 | 991 | if (ltrans_statics_bitcount) |
7380e6ef | 992 | for (i = 0; i < lto_symtab_encoder_size (encoder); i++) |
f3380641 | 993 | { |
5e20cdc9 | 994 | symtab_node *snode = lto_symtab_encoder_deref (encoder, i); |
7de90a6c | 995 | cgraph_node *cnode = dyn_cast <cgraph_node *> (snode); |
5d59b5e1 | 996 | if (cnode && write_node_summary_p (cnode, encoder, ltrans_statics)) |
22a8d1e6 JH |
997 | { |
998 | ipa_reference_optimization_summary_t info; | |
999 | int node_ref; | |
1000 | ||
5d59b5e1 LC |
1001 | info = get_reference_optimization_summary (cnode); |
1002 | node_ref = lto_symtab_encoder_encode (encoder, snode); | |
412288f1 | 1003 | streamer_write_uhwi_stream (ob->main_stream, node_ref); |
22a8d1e6 JH |
1004 | |
1005 | stream_out_bitmap (ob, info->statics_not_read, ltrans_statics, | |
1006 | ltrans_statics_bitcount); | |
1007 | stream_out_bitmap (ob, info->statics_not_written, ltrans_statics, | |
1008 | ltrans_statics_bitcount); | |
1009 | } | |
f3380641 JH |
1010 | } |
1011 | BITMAP_FREE (ltrans_statics); | |
1012 | lto_destroy_simple_output_block (ob); | |
1013 | splay_tree_delete (reference_vars_to_consider); | |
1014 | } | |
1015 | ||
1016 | /* Deserialize the ipa info for lto. */ | |
1017 | ||
1018 | static void | |
1019 | ipa_reference_read_optimization_summary (void) | |
1020 | { | |
1021 | struct lto_file_decl_data ** file_data_vec | |
1022 | = lto_get_file_decl_data (); | |
1023 | struct lto_file_decl_data * file_data; | |
1024 | unsigned int j = 0; | |
1025 | bitmap_obstack_initialize (&optimization_summary_obstack); | |
1026 | ||
1027 | node_removal_hook_holder = | |
3dafb85c | 1028 | symtab->add_cgraph_removal_hook (&remove_node_data, NULL); |
f3380641 | 1029 | node_duplication_hook_holder = |
3dafb85c | 1030 | symtab->add_cgraph_duplication_hook (&duplicate_node_data, NULL); |
22a8d1e6 | 1031 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
f3380641 JH |
1032 | |
1033 | while ((file_data = file_data_vec[j++])) | |
1034 | { | |
1035 | const char *data; | |
1036 | size_t len; | |
1037 | struct lto_input_block *ib | |
1038 | = lto_create_simple_input_block (file_data, | |
1039 | LTO_section_ipa_reference, | |
1040 | &data, &len); | |
1041 | if (ib) | |
1042 | { | |
1043 | unsigned int i; | |
412288f1 | 1044 | unsigned int f_count = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1045 | int b_count; |
1046 | if (!f_count) | |
1047 | continue; | |
412288f1 | 1048 | b_count = streamer_read_hwi (ib); |
22a8d1e6 JH |
1049 | if (dump_file) |
1050 | fprintf (dump_file, "all module statics:"); | |
1051 | for (i = 0; i < (unsigned int)b_count; i++) | |
1052 | { | |
412288f1 | 1053 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1054 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1055 | var_index); | |
1056 | bitmap_set_bit (all_module_statics, DECL_UID (v_decl)); | |
1057 | if (dump_file) | |
df92c640 | 1058 | fprintf (dump_file, " %s", fndecl_name (v_decl)); |
22a8d1e6 | 1059 | } |
f3380641 JH |
1060 | |
1061 | for (i = 0; i < f_count; i++) | |
1062 | { | |
1063 | unsigned int j, index; | |
1064 | struct cgraph_node *node; | |
1065 | ipa_reference_optimization_summary_t info; | |
1066 | int v_count; | |
7380e6ef | 1067 | lto_symtab_encoder_t encoder; |
f3380641 | 1068 | |
412288f1 | 1069 | index = streamer_read_uhwi (ib); |
7380e6ef | 1070 | encoder = file_data->symtab_node_encoder; |
d52f5295 ML |
1071 | node = dyn_cast<cgraph_node *> (lto_symtab_encoder_deref |
1072 | (encoder, index)); | |
f3380641 JH |
1073 | info = XCNEW (struct ipa_reference_optimization_summary_d); |
1074 | set_reference_optimization_summary (node, info); | |
1075 | info->statics_not_read = BITMAP_ALLOC (&optimization_summary_obstack); | |
1076 | info->statics_not_written = BITMAP_ALLOC (&optimization_summary_obstack); | |
1077 | if (dump_file) | |
1078 | fprintf (dump_file, | |
1079 | "\nFunction name:%s/%i:\n static not read:", | |
fec39fa6 | 1080 | node->asm_name (), node->order); |
f3380641 JH |
1081 | |
1082 | /* Set the statics not read. */ | |
412288f1 | 1083 | v_count = streamer_read_hwi (ib); |
22a8d1e6 | 1084 | if (v_count == -1) |
f3380641 | 1085 | { |
22a8d1e6 | 1086 | info->statics_not_read = all_module_statics; |
f3380641 | 1087 | if (dump_file) |
22a8d1e6 | 1088 | fprintf (dump_file, " all module statics"); |
f3380641 | 1089 | } |
22a8d1e6 JH |
1090 | else |
1091 | for (j = 0; j < (unsigned int)v_count; j++) | |
1092 | { | |
412288f1 | 1093 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1094 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1095 | var_index); | |
1096 | bitmap_set_bit (info->statics_not_read, DECL_UID (v_decl)); | |
1097 | if (dump_file) | |
df92c640 | 1098 | fprintf (dump_file, " %s", fndecl_name (v_decl)); |
22a8d1e6 | 1099 | } |
f3380641 JH |
1100 | |
1101 | if (dump_file) | |
1102 | fprintf (dump_file, | |
1103 | "\n static not written:"); | |
1104 | /* Set the statics not written. */ | |
412288f1 | 1105 | v_count = streamer_read_hwi (ib); |
22a8d1e6 | 1106 | if (v_count == -1) |
f3380641 | 1107 | { |
22a8d1e6 | 1108 | info->statics_not_written = all_module_statics; |
f3380641 | 1109 | if (dump_file) |
22a8d1e6 | 1110 | fprintf (dump_file, " all module statics"); |
f3380641 | 1111 | } |
22a8d1e6 JH |
1112 | else |
1113 | for (j = 0; j < (unsigned int)v_count; j++) | |
1114 | { | |
412288f1 | 1115 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1116 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1117 | var_index); | |
1118 | bitmap_set_bit (info->statics_not_written, DECL_UID (v_decl)); | |
1119 | if (dump_file) | |
df92c640 | 1120 | fprintf (dump_file, " %s", fndecl_name (v_decl)); |
22a8d1e6 | 1121 | } |
f3380641 JH |
1122 | if (dump_file) |
1123 | fprintf (dump_file, "\n"); | |
1124 | } | |
1125 | ||
1126 | lto_destroy_simple_input_block (file_data, | |
1127 | LTO_section_ipa_reference, | |
1128 | ib, data, len); | |
1129 | } | |
1130 | else | |
1131 | /* Fatal error here. We do not want to support compiling ltrans units with | |
1132 | different version of compiler or different flags than the WPA unit, so | |
1133 | this should never happen. */ | |
1134 | fatal_error ("ipa reference summary is missing in ltrans unit"); | |
1135 | } | |
1136 | } | |
ea900239 | 1137 | |
27a4cd48 DM |
1138 | namespace { |
1139 | ||
1140 | const pass_data pass_data_ipa_reference = | |
ea900239 | 1141 | { |
27a4cd48 DM |
1142 | IPA_PASS, /* type */ |
1143 | "static-var", /* name */ | |
1144 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
1145 | TV_IPA_REFERENCE, /* tv_id */ |
1146 | 0, /* properties_required */ | |
1147 | 0, /* properties_provided */ | |
1148 | 0, /* properties_destroyed */ | |
1149 | 0, /* todo_flags_start */ | |
1150 | 0, /* todo_flags_finish */ | |
ea900239 | 1151 | }; |
27a4cd48 DM |
1152 | |
1153 | class pass_ipa_reference : public ipa_opt_pass_d | |
1154 | { | |
1155 | public: | |
c3284718 RS |
1156 | pass_ipa_reference (gcc::context *ctxt) |
1157 | : ipa_opt_pass_d (pass_data_ipa_reference, ctxt, | |
1158 | NULL, /* generate_summary */ | |
1159 | NULL, /* write_summary */ | |
1160 | NULL, /* read_summary */ | |
1161 | ipa_reference_write_optimization_summary, /* | |
1162 | write_optimization_summary */ | |
1163 | ipa_reference_read_optimization_summary, /* | |
1164 | read_optimization_summary */ | |
1165 | NULL, /* stmt_fixup */ | |
1166 | 0, /* function_transform_todo_flags_start */ | |
1167 | NULL, /* function_transform */ | |
1168 | NULL) /* variable_transform */ | |
1169 | {} | |
27a4cd48 DM |
1170 | |
1171 | /* opt_pass methods: */ | |
1a3d085c TS |
1172 | virtual bool gate (function *) |
1173 | { | |
1174 | return (flag_ipa_reference | |
1175 | /* Don't bother doing anything if the program has errors. */ | |
1176 | && !seen_error ()); | |
1177 | } | |
1178 | ||
be55bfe6 | 1179 | virtual unsigned int execute (function *) { return propagate (); } |
27a4cd48 DM |
1180 | |
1181 | }; // class pass_ipa_reference | |
1182 | ||
1183 | } // anon namespace | |
1184 | ||
1185 | ipa_opt_pass_d * | |
1186 | make_pass_ipa_reference (gcc::context *ctxt) | |
1187 | { | |
1188 | return new pass_ipa_reference (ctxt); | |
1189 | } | |
3edf64aa DM |
1190 | |
1191 | /* Reset all state within ipa-reference.c so that we can rerun the compiler | |
1192 | within the same process. For use by toplev::finalize. */ | |
1193 | ||
1194 | void | |
1195 | ipa_reference_c_finalize (void) | |
1196 | { | |
4c4d052c DM |
1197 | if (ipa_init_p) |
1198 | { | |
1199 | bitmap_obstack_release (&optimization_summary_obstack); | |
1200 | ipa_init_p = false; | |
1201 | } | |
953971cf DM |
1202 | |
1203 | if (node_removal_hook_holder) | |
1204 | { | |
1205 | symtab->remove_cgraph_removal_hook (node_removal_hook_holder); | |
1206 | node_removal_hook_holder = NULL; | |
1207 | } | |
1208 | if (node_duplication_hook_holder) | |
1209 | { | |
1210 | symtab->remove_cgraph_duplication_hook (node_duplication_hook_holder); | |
1211 | node_duplication_hook_holder = NULL; | |
1212 | } | |
3edf64aa | 1213 | } |