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ea900239 | 1 | /* Callgraph based analysis of static variables. |
c75c517d SB |
2 | Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 |
3 | Free Software Foundation, Inc. | |
ea900239 DB |
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 | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
ea900239 DB |
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 | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
ea900239 DB |
21 | |
22 | /* This file gathers information about how variables whose scope is | |
b8698a0f | 23 | confined to the compilation unit are used. |
ea900239 | 24 | |
4a444e58 | 25 | The transitive call site specific clobber effects are computed |
ea900239 DB |
26 | for the variables whose scope is contained within this compilation |
27 | unit. | |
28 | ||
29 | First each function and static variable initialization is analyzed | |
30 | to determine which local static variables are either read, written, | |
31 | or have their address taken. Any local static that has its address | |
32 | taken is removed from consideration. Once the local read and | |
33 | writes are determined, a transitive closure of this information is | |
34 | performed over the call graph to determine the worst case set of | |
35 | side effects of each call. In later parts of the compiler, these | |
36 | local and global sets are examined to make the call clobbering less | |
37 | traumatic, promote some statics to registers, and improve aliasing | |
4a444e58 | 38 | information. */ |
ea900239 DB |
39 | |
40 | #include "config.h" | |
41 | #include "system.h" | |
42 | #include "coretypes.h" | |
43 | #include "tm.h" | |
44 | #include "tree.h" | |
45 | #include "tree-flow.h" | |
46 | #include "tree-inline.h" | |
47 | #include "tree-pass.h" | |
48 | #include "langhooks.h" | |
49 | #include "pointer-set.h" | |
ea264ca5 | 50 | #include "splay-tree.h" |
ea900239 DB |
51 | #include "ggc.h" |
52 | #include "ipa-utils.h" | |
53 | #include "ipa-reference.h" | |
726a989a | 54 | #include "gimple.h" |
ea900239 DB |
55 | #include "cgraph.h" |
56 | #include "output.h" | |
57 | #include "flags.h" | |
58 | #include "timevar.h" | |
59 | #include "diagnostic.h" | |
60 | #include "langhooks.h" | |
412288f1 | 61 | #include "data-streamer.h" |
d7f09764 DN |
62 | #include "lto-streamer.h" |
63 | ||
d7f09764 DN |
64 | static void remove_node_data (struct cgraph_node *node, |
65 | void *data ATTRIBUTE_UNUSED); | |
66 | static void duplicate_node_data (struct cgraph_node *src, | |
67 | struct cgraph_node *dst, | |
68 | void *data ATTRIBUTE_UNUSED); | |
ea900239 | 69 | |
e2c9111c | 70 | /* The static variables defined within the compilation unit that are |
b8698a0f | 71 | loaded or stored directly by function that owns this structure. */ |
e2c9111c | 72 | |
b8698a0f | 73 | struct ipa_reference_local_vars_info_d |
e2c9111c JH |
74 | { |
75 | bitmap statics_read; | |
76 | bitmap statics_written; | |
e2c9111c JH |
77 | }; |
78 | ||
79 | /* Statics that are read and written by some set of functions. The | |
80 | local ones are based on the loads and stores local to the function. | |
81 | The global ones are based on the local info as well as the | |
46c30019 | 82 | transitive closure of the functions that are called. */ |
e2c9111c JH |
83 | |
84 | struct ipa_reference_global_vars_info_d | |
85 | { | |
86 | bitmap statics_read; | |
87 | bitmap statics_written; | |
46c30019 JH |
88 | }; |
89 | ||
61502ca8 | 90 | /* Information we save about every function after ipa-reference is completed. */ |
46c30019 JH |
91 | |
92 | struct ipa_reference_optimization_summary_d | |
93 | { | |
e2c9111c JH |
94 | bitmap statics_not_read; |
95 | bitmap statics_not_written; | |
96 | }; | |
97 | ||
98 | typedef struct ipa_reference_local_vars_info_d *ipa_reference_local_vars_info_t; | |
99 | typedef struct ipa_reference_global_vars_info_d *ipa_reference_global_vars_info_t; | |
46c30019 JH |
100 | typedef struct ipa_reference_optimization_summary_d *ipa_reference_optimization_summary_t; |
101 | ||
b8698a0f | 102 | struct ipa_reference_vars_info_d |
e2c9111c | 103 | { |
46c30019 JH |
104 | struct ipa_reference_local_vars_info_d local; |
105 | struct ipa_reference_global_vars_info_d global; | |
e2c9111c JH |
106 | }; |
107 | ||
108 | typedef struct ipa_reference_vars_info_d *ipa_reference_vars_info_t; | |
109 | ||
ea900239 | 110 | /* This splay tree contains all of the static variables that are |
46c30019 JH |
111 | being considered by the compilation level alias analysis. */ |
112 | static splay_tree reference_vars_to_consider; | |
ea900239 | 113 | |
ea900239 DB |
114 | /* A bit is set for every module static we are considering. This is |
115 | ored into the local info when asm code is found that clobbers all | |
116 | memory. */ | |
117 | static bitmap all_module_statics; | |
118 | ||
ebcf9dc8 JH |
119 | /* Obstack holding bitmaps of local analysis (live from analysis to |
120 | propagation) */ | |
121 | static bitmap_obstack local_info_obstack; | |
122 | /* Obstack holding global analysis live forever. */ | |
46c30019 | 123 | static bitmap_obstack optimization_summary_obstack; |
ea900239 | 124 | |
129a37fc | 125 | /* Holders of ipa cgraph hooks: */ |
e2c9111c JH |
126 | static struct cgraph_2node_hook_list *node_duplication_hook_holder; |
127 | static struct cgraph_node_hook_list *node_removal_hook_holder; | |
129a37fc | 128 | |
e2c9111c JH |
129 | /* Vector where the reference var infos are actually stored. */ |
130 | DEF_VEC_P (ipa_reference_vars_info_t); | |
131 | DEF_VEC_ALLOC_P (ipa_reference_vars_info_t, heap); | |
132 | static VEC (ipa_reference_vars_info_t, heap) *ipa_reference_vars_vector; | |
46c30019 JH |
133 | DEF_VEC_P (ipa_reference_optimization_summary_t); |
134 | DEF_VEC_ALLOC_P (ipa_reference_optimization_summary_t, heap); | |
135 | static VEC (ipa_reference_optimization_summary_t, heap) *ipa_reference_opt_sum_vector; | |
e2c9111c | 136 | |
ea900239 DB |
137 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
138 | static inline ipa_reference_vars_info_t | |
e2c9111c JH |
139 | get_reference_vars_info (struct cgraph_node *node) |
140 | { | |
141 | if (!ipa_reference_vars_vector | |
46c30019 JH |
142 | || VEC_length (ipa_reference_vars_info_t, |
143 | ipa_reference_vars_vector) <= (unsigned int) node->uid) | |
e2c9111c | 144 | return NULL; |
46c30019 JH |
145 | return VEC_index (ipa_reference_vars_info_t, ipa_reference_vars_vector, |
146 | node->uid); | |
e2c9111c JH |
147 | } |
148 | ||
149 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ | |
46c30019 JH |
150 | static inline ipa_reference_optimization_summary_t |
151 | get_reference_optimization_summary (struct cgraph_node *node) | |
ea900239 | 152 | { |
46c30019 JH |
153 | if (!ipa_reference_opt_sum_vector |
154 | || (VEC_length (ipa_reference_optimization_summary_t, | |
22a8d1e6 | 155 | ipa_reference_opt_sum_vector) |
46c30019 | 156 | <= (unsigned int) node->uid)) |
ea900239 | 157 | return NULL; |
46c30019 JH |
158 | return VEC_index (ipa_reference_optimization_summary_t, ipa_reference_opt_sum_vector, |
159 | node->uid); | |
ea900239 DB |
160 | } |
161 | ||
46c30019 JH |
162 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
163 | static inline void | |
164 | set_reference_vars_info (struct cgraph_node *node, | |
165 | ipa_reference_vars_info_t info) | |
ea900239 | 166 | { |
46c30019 JH |
167 | if (!ipa_reference_vars_vector |
168 | || VEC_length (ipa_reference_vars_info_t, | |
169 | ipa_reference_vars_vector) <= (unsigned int) node->uid) | |
170 | VEC_safe_grow_cleared (ipa_reference_vars_info_t, heap, | |
171 | ipa_reference_vars_vector, node->uid + 1); | |
172 | VEC_replace (ipa_reference_vars_info_t, ipa_reference_vars_vector, | |
173 | 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 | { |
46c30019 JH |
181 | if (!ipa_reference_opt_sum_vector |
182 | || (VEC_length (ipa_reference_optimization_summary_t, | |
183 | ipa_reference_opt_sum_vector) | |
184 | <= (unsigned int) node->uid)) | |
185 | VEC_safe_grow_cleared (ipa_reference_optimization_summary_t, | |
186 | heap, ipa_reference_opt_sum_vector, node->uid + 1); | |
187 | VEC_replace (ipa_reference_optimization_summary_t, | |
188 | ipa_reference_opt_sum_vector, node->uid, info); | |
ea900239 DB |
189 | } |
190 | ||
191 | /* Return a bitmap indexed by_DECL_UID uid for the static variables | |
192 | that are not read during the execution of the function FN. Returns | |
193 | NULL if no data is available. */ | |
194 | ||
b8698a0f L |
195 | bitmap |
196 | ipa_reference_get_not_read_global (struct cgraph_node *fn) | |
ea900239 | 197 | { |
46c30019 JH |
198 | ipa_reference_optimization_summary_t info; |
199 | ||
fede8efa | 200 | info = get_reference_optimization_summary (cgraph_function_node (fn, NULL)); |
46c30019 JH |
201 | if (info) |
202 | return info->statics_not_read; | |
960bfb69 | 203 | else if (flags_from_decl_or_type (fn->symbol.decl) & ECF_LEAF) |
46a4da10 | 204 | return all_module_statics; |
ea900239 DB |
205 | else |
206 | return NULL; | |
207 | } | |
208 | ||
209 | /* Return a bitmap indexed by DECL_UID uid for the static variables | |
210 | that are not written during the execution of the function FN. Note | |
211 | that variables written may or may not be read during the function | |
212 | call. Returns NULL if no data is available. */ | |
213 | ||
b8698a0f L |
214 | bitmap |
215 | ipa_reference_get_not_written_global (struct cgraph_node *fn) | |
ea900239 | 216 | { |
46c30019 JH |
217 | ipa_reference_optimization_summary_t info; |
218 | ||
219 | info = get_reference_optimization_summary (fn); | |
220 | if (info) | |
221 | return info->statics_not_written; | |
960bfb69 | 222 | else if (flags_from_decl_or_type (fn->symbol.decl) & ECF_LEAF) |
46a4da10 | 223 | return all_module_statics; |
ea900239 DB |
224 | else |
225 | return NULL; | |
226 | } | |
227 | ||
228 | \f | |
229 | ||
230 | /* Add VAR to all_module_statics and the two | |
231 | reference_vars_to_consider* sets. */ | |
232 | ||
b8698a0f L |
233 | static inline void |
234 | add_static_var (tree var) | |
ea900239 DB |
235 | { |
236 | int uid = DECL_UID (var); | |
ebcf9dc8 | 237 | gcc_assert (TREE_CODE (var) == VAR_DECL); |
df24c2b8 JH |
238 | if (dump_file) |
239 | splay_tree_insert (reference_vars_to_consider, | |
240 | uid, (splay_tree_value)var); | |
241 | bitmap_set_bit (all_module_statics, uid); | |
ea900239 DB |
242 | } |
243 | ||
244 | /* Return true if the variable T is the right kind of static variable to | |
245 | perform compilation unit scope escape analysis. */ | |
246 | ||
b8698a0f | 247 | static inline bool |
5f902d76 | 248 | is_proper_for_analysis (tree t) |
ea900239 | 249 | { |
46c30019 JH |
250 | /* We handle only variables whose address is never taken. */ |
251 | if (TREE_ADDRESSABLE (t)) | |
252 | return false; | |
22a8d1e6 | 253 | |
ea900239 DB |
254 | /* If the variable has the "used" attribute, treat it as if it had a |
255 | been touched by the devil. */ | |
b42186f1 | 256 | if (DECL_PRESERVE_P (t)) |
ea900239 DB |
257 | return false; |
258 | ||
259 | /* Do not want to do anything with volatile except mark any | |
260 | function that uses one to be not const or pure. */ | |
b8698a0f | 261 | if (TREE_THIS_VOLATILE (t)) |
ea900239 DB |
262 | return false; |
263 | ||
22a8d1e6 JH |
264 | /* We do not need to analyze readonly vars, we already know they do not |
265 | alias. */ | |
266 | if (TREE_READONLY (t)) | |
267 | return false; | |
268 | ||
2276d5ed AP |
269 | /* We cannot touch decls where the type needs constructing. */ |
270 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (t))) | |
271 | return false; | |
272 | ||
ea900239 DB |
273 | /* This is a variable we care about. Check if we have seen it |
274 | before, and if not add it the set of variables we care about. */ | |
f3380641 JH |
275 | if (all_module_statics |
276 | && !bitmap_bit_p (all_module_statics, DECL_UID (t))) | |
ea900239 DB |
277 | add_static_var (t); |
278 | ||
279 | return true; | |
280 | } | |
281 | ||
ea900239 | 282 | /* Lookup the tree node for the static variable that has UID and |
a4174ebf | 283 | convert the name to a string for debugging. */ |
ea900239 DB |
284 | |
285 | static const char * | |
286 | get_static_name (int index) | |
287 | { | |
b8698a0f | 288 | splay_tree_node stn = |
ea900239 DB |
289 | splay_tree_lookup (reference_vars_to_consider, index); |
290 | if (stn) | |
291 | return lang_hooks.decl_printable_name ((tree)(stn->value), 2); | |
292 | return NULL; | |
293 | } | |
294 | ||
e2c9111c JH |
295 | /* Or in all of the bits from every callee of X into X_GLOBAL, the caller's cycle, |
296 | bit vector. There are several cases to check to avoid the sparse | |
ea900239 DB |
297 | bitmap oring. */ |
298 | ||
299 | static void | |
e2c9111c | 300 | propagate_bits (ipa_reference_global_vars_info_t x_global, struct cgraph_node *x) |
ea900239 | 301 | { |
ea900239 | 302 | struct cgraph_edge *e; |
b8698a0f | 303 | for (e = x->callees; e; e = e->next_callee) |
ea900239 | 304 | { |
46a4da10 | 305 | enum availability avail; |
fede8efa | 306 | struct cgraph_node *y = cgraph_function_node (e->callee, &avail); |
ea900239 | 307 | |
fede8efa JH |
308 | if (!y) |
309 | continue; | |
c59f5d1b | 310 | /* Only look into nodes we can propagate something. */ |
46a4da10 JH |
311 | if (avail > AVAIL_OVERWRITABLE |
312 | || (avail == AVAIL_OVERWRITABLE | |
960bfb69 | 313 | && (flags_from_decl_or_type (y->symbol.decl) & ECF_LEAF))) |
ea900239 | 314 | { |
960bfb69 | 315 | int flags = flags_from_decl_or_type (y->symbol.decl); |
e2c9111c | 316 | if (get_reference_vars_info (y)) |
ea900239 | 317 | { |
b8698a0f | 318 | ipa_reference_vars_info_t y_info |
e2c9111c | 319 | = get_reference_vars_info (y); |
46c30019 | 320 | ipa_reference_global_vars_info_t y_global = &y_info->global; |
e2c9111c JH |
321 | |
322 | /* Calls in current cycle do not have global computed yet. */ | |
46c30019 | 323 | if (!y_global->statics_read) |
e2c9111c | 324 | continue; |
b8698a0f | 325 | |
22a8d1e6 JH |
326 | /* If function is declared const, it reads no memory even if it |
327 | seems so to local analysis. */ | |
328 | if (flags & ECF_CONST) | |
329 | continue; | |
330 | ||
ea900239 DB |
331 | if (x_global->statics_read |
332 | != all_module_statics) | |
333 | { | |
b8698a0f | 334 | if (y_global->statics_read |
ea900239 DB |
335 | == all_module_statics) |
336 | { | |
337 | BITMAP_FREE (x_global->statics_read); | |
b8698a0f | 338 | x_global->statics_read |
ea900239 DB |
339 | = all_module_statics; |
340 | } | |
341 | /* Skip bitmaps that are pointer equal to node's bitmap | |
342 | (no reason to spin within the cycle). */ | |
b8698a0f | 343 | else if (x_global->statics_read |
ea900239 DB |
344 | != y_global->statics_read) |
345 | bitmap_ior_into (x_global->statics_read, | |
346 | y_global->statics_read); | |
347 | } | |
b8698a0f | 348 | |
22a8d1e6 JH |
349 | /* If function is declared pure, it has no stores even if it |
350 | seems so to local analysis; If we can not return from here, | |
351 | we can safely ignore the call. */ | |
352 | if ((flags & ECF_PURE) | |
353 | || cgraph_edge_cannot_lead_to_return (e)) | |
354 | continue; | |
355 | ||
b8698a0f | 356 | if (x_global->statics_written |
ea900239 DB |
357 | != all_module_statics) |
358 | { | |
b8698a0f | 359 | if (y_global->statics_written |
ea900239 DB |
360 | == all_module_statics) |
361 | { | |
362 | BITMAP_FREE (x_global->statics_written); | |
b8698a0f | 363 | x_global->statics_written |
ea900239 DB |
364 | = all_module_statics; |
365 | } | |
366 | /* Skip bitmaps that are pointer equal to node's bitmap | |
367 | (no reason to spin within the cycle). */ | |
b8698a0f | 368 | else if (x_global->statics_written |
ea900239 DB |
369 | != y_global->statics_written) |
370 | bitmap_ior_into (x_global->statics_written, | |
371 | y_global->statics_written); | |
372 | } | |
373 | } | |
b8698a0f | 374 | else |
ebcf9dc8 | 375 | gcc_unreachable (); |
ea900239 DB |
376 | } |
377 | } | |
378 | } | |
379 | ||
ea900239 DB |
380 | /* The init routine for analyzing global static variable usage. See |
381 | comments at top for description. */ | |
b8698a0f L |
382 | static void |
383 | ipa_init (void) | |
ea900239 | 384 | { |
d7f09764 DN |
385 | static bool init_p = false; |
386 | ||
387 | if (init_p) | |
388 | return; | |
389 | ||
390 | init_p = true; | |
391 | ||
46c30019 JH |
392 | if (dump_file) |
393 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
ea900239 | 394 | |
ebcf9dc8 | 395 | bitmap_obstack_initialize (&local_info_obstack); |
46c30019 | 396 | bitmap_obstack_initialize (&optimization_summary_obstack); |
22a8d1e6 | 397 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
7dbca013 | 398 | |
d7f09764 DN |
399 | node_removal_hook_holder = |
400 | cgraph_add_node_removal_hook (&remove_node_data, NULL); | |
401 | node_duplication_hook_holder = | |
402 | cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); | |
ea900239 DB |
403 | } |
404 | ||
d7f09764 | 405 | |
812dbce5 | 406 | /* Set up the persistent info for FN. */ |
ea900239 | 407 | |
812dbce5 JH |
408 | static ipa_reference_local_vars_info_t |
409 | init_function_info (struct cgraph_node *fn) | |
ea900239 | 410 | { |
b8698a0f | 411 | ipa_reference_vars_info_t info |
c5274326 | 412 | = XCNEW (struct ipa_reference_vars_info_d); |
ea900239 DB |
413 | |
414 | /* Add the info to the tree's annotation. */ | |
e2c9111c | 415 | set_reference_vars_info (fn, info); |
ea900239 | 416 | |
46c30019 JH |
417 | info->local.statics_read = BITMAP_ALLOC (&local_info_obstack); |
418 | info->local.statics_written = BITMAP_ALLOC (&local_info_obstack); | |
ea900239 | 419 | |
46c30019 | 420 | return &info->local; |
812dbce5 JH |
421 | } |
422 | ||
d7f09764 | 423 | |
812dbce5 JH |
424 | /* This is the main routine for finding the reference patterns for |
425 | global variables within a function FN. */ | |
d7f09764 | 426 | |
812dbce5 JH |
427 | static void |
428 | analyze_function (struct cgraph_node *fn) | |
429 | { | |
8b583a06 | 430 | ipa_reference_local_vars_info_t local; |
5f902d76 JH |
431 | struct ipa_ref *ref; |
432 | int i; | |
433 | tree var; | |
812dbce5 | 434 | |
5f902d76 | 435 | local = init_function_info (fn); |
960bfb69 | 436 | for (i = 0; ipa_ref_list_reference_iterate (&fn->symbol.ref_list, i, ref); i++) |
812dbce5 | 437 | { |
5f902d76 JH |
438 | if (ref->refered_type != IPA_REF_VARPOOL) |
439 | continue; | |
960bfb69 JH |
440 | var = ipa_ref_varpool_node (ref)->symbol.decl; |
441 | if (ipa_ref_varpool_node (ref)->symbol.externally_visible | |
5f902d76 JH |
442 | || !ipa_ref_varpool_node (ref)->analyzed |
443 | || !is_proper_for_analysis (var)) | |
444 | continue; | |
445 | switch (ref->use) | |
812dbce5 | 446 | { |
5f902d76 JH |
447 | case IPA_REF_LOAD: |
448 | bitmap_set_bit (local->statics_read, DECL_UID (var)); | |
449 | break; | |
450 | case IPA_REF_STORE: | |
f10ea640 JH |
451 | if (ipa_ref_cannot_lead_to_return (ref)) |
452 | break; | |
5f902d76 | 453 | bitmap_set_bit (local->statics_written, DECL_UID (var)); |
5f902d76 JH |
454 | break; |
455 | case IPA_REF_ADDR: | |
22a8d1e6 | 456 | gcc_unreachable (); |
5f902d76 | 457 | break; |
812dbce5 | 458 | } |
812dbce5 | 459 | } |
ea900239 | 460 | |
22a8d1e6 JH |
461 | if (cgraph_node_cannot_return (fn)) |
462 | bitmap_clear (local->statics_written); | |
ea900239 DB |
463 | } |
464 | ||
e2c9111c JH |
465 | static bitmap |
466 | copy_global_bitmap (bitmap src) | |
467 | { | |
468 | bitmap dst; | |
469 | if (!src) | |
470 | return NULL; | |
22a8d1e6 JH |
471 | if (src == all_module_statics) |
472 | return all_module_statics; | |
46c30019 | 473 | dst = BITMAP_ALLOC (&optimization_summary_obstack); |
e2c9111c JH |
474 | bitmap_copy (dst, src); |
475 | return dst; | |
476 | } | |
477 | ||
5f902d76 | 478 | |
e2c9111c JH |
479 | /* Called when new clone is inserted to callgraph late. */ |
480 | ||
481 | static void | |
482 | duplicate_node_data (struct cgraph_node *src, struct cgraph_node *dst, | |
483 | void *data ATTRIBUTE_UNUSED) | |
484 | { | |
46c30019 JH |
485 | ipa_reference_optimization_summary_t ginfo; |
486 | ipa_reference_optimization_summary_t dst_ginfo; | |
e2c9111c | 487 | |
46c30019 | 488 | ginfo = get_reference_optimization_summary (src); |
5f902d76 | 489 | if (!ginfo) |
e2c9111c | 490 | return; |
46c30019 JH |
491 | dst_ginfo = XCNEW (struct ipa_reference_optimization_summary_d); |
492 | set_reference_optimization_summary (dst, dst_ginfo); | |
493 | dst_ginfo->statics_not_read = copy_global_bitmap (ginfo->statics_not_read); | |
494 | dst_ginfo->statics_not_written = copy_global_bitmap (ginfo->statics_not_written); | |
e2c9111c JH |
495 | } |
496 | ||
497 | /* Called when node is removed. */ | |
498 | ||
499 | static void | |
500 | remove_node_data (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
501 | { | |
46c30019 JH |
502 | ipa_reference_optimization_summary_t ginfo; |
503 | ginfo = get_reference_optimization_summary (node); | |
504 | if (ginfo) | |
505 | { | |
506 | if (ginfo->statics_not_read | |
507 | && ginfo->statics_not_read != all_module_statics) | |
508 | BITMAP_FREE (ginfo->statics_not_read); | |
509 | ||
510 | if (ginfo->statics_not_written | |
511 | && ginfo->statics_not_written != all_module_statics) | |
512 | BITMAP_FREE (ginfo->statics_not_written); | |
513 | free (ginfo); | |
514 | set_reference_optimization_summary (node, NULL); | |
515 | } | |
e2c9111c JH |
516 | } |
517 | ||
812dbce5 JH |
518 | /* Analyze each function in the cgraph to see which global or statics |
519 | are read or written. */ | |
520 | ||
b8698a0f | 521 | static void |
812dbce5 | 522 | generate_summary (void) |
ea900239 DB |
523 | { |
524 | struct cgraph_node *node; | |
812dbce5 JH |
525 | unsigned int index; |
526 | bitmap_iterator bi; | |
812dbce5 | 527 | bitmap bm_temp; |
b8698a0f | 528 | |
ea900239 | 529 | ipa_init (); |
ebcf9dc8 | 530 | bm_temp = BITMAP_ALLOC (&local_info_obstack); |
ea900239 | 531 | |
5f902d76 | 532 | /* Process all of the functions next. */ |
ea900239 | 533 | for (node = cgraph_nodes; node; node = node->next) |
5f902d76 | 534 | if (node->analyzed) |
ea900239 DB |
535 | analyze_function (node); |
536 | ||
812dbce5 | 537 | if (dump_file) |
ea900239 DB |
538 | EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi) |
539 | { | |
812dbce5 JH |
540 | fprintf (dump_file, "\nPromotable global:%s", |
541 | get_static_name (index)); | |
ea900239 | 542 | } |
b8698a0f | 543 | |
812dbce5 | 544 | BITMAP_FREE(bm_temp); |
b8698a0f | 545 | |
ea900239 | 546 | if (dump_file) |
812dbce5 | 547 | for (node = cgraph_nodes; node; node = node->next) |
e2c9111c | 548 | if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE) |
ea900239 | 549 | { |
ea900239 | 550 | ipa_reference_local_vars_info_t l; |
812dbce5 | 551 | unsigned int index; |
ea900239 | 552 | bitmap_iterator bi; |
b8698a0f | 553 | |
46c30019 | 554 | l = &get_reference_vars_info (node)->local; |
b8698a0f L |
555 | fprintf (dump_file, |
556 | "\nFunction name:%s/%i:", | |
ea900239 DB |
557 | cgraph_node_name (node), node->uid); |
558 | fprintf (dump_file, "\n locals read: "); | |
8b583a06 JH |
559 | if (l->statics_read) |
560 | EXECUTE_IF_SET_IN_BITMAP (l->statics_read, | |
561 | 0, index, bi) | |
562 | { | |
563 | fprintf (dump_file, "%s ", | |
564 | get_static_name (index)); | |
565 | } | |
ea900239 | 566 | fprintf (dump_file, "\n locals written: "); |
8b583a06 JH |
567 | if (l->statics_written) |
568 | EXECUTE_IF_SET_IN_BITMAP (l->statics_written, | |
569 | 0, index, bi) | |
570 | { | |
571 | fprintf(dump_file, "%s ", | |
572 | get_static_name (index)); | |
573 | } | |
ea900239 | 574 | } |
812dbce5 JH |
575 | } |
576 | \f | |
22a8d1e6 | 577 | /* Set READ_ALL/WRITE_ALL based on decl flags of NODE. */ |
46c30019 | 578 | |
c59f5d1b | 579 | static void |
22a8d1e6 JH |
580 | read_write_all_from_decl (struct cgraph_node *node, bool * read_all, |
581 | bool * write_all) | |
c59f5d1b | 582 | { |
960bfb69 | 583 | tree decl = node->symbol.decl; |
c59f5d1b | 584 | int flags = flags_from_decl_or_type (decl); |
46a4da10 JH |
585 | if ((flags & ECF_LEAF) |
586 | && cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) | |
587 | ; | |
588 | else if (flags & ECF_CONST) | |
c59f5d1b | 589 | ; |
22a8d1e6 JH |
590 | else if ((flags & ECF_PURE) |
591 | || cgraph_node_cannot_return (node)) | |
46a4da10 JH |
592 | { |
593 | *read_all = true; | |
594 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
595 | fprintf (dump_file, " %s/%i -> read all\n", | |
596 | cgraph_node_name (node), node->uid); | |
597 | } | |
c59f5d1b JH |
598 | else |
599 | { | |
600 | /* TODO: To be able to produce sane results, we should also handle | |
46c30019 | 601 | common builtins, in particular throw. */ |
c59f5d1b | 602 | *read_all = true; |
22a8d1e6 | 603 | *write_all = true; |
46a4da10 JH |
604 | if (dump_file && (dump_flags & TDF_DETAILS)) |
605 | fprintf (dump_file, " %s/%i -> read all, write all\n", | |
606 | cgraph_node_name (node), node->uid); | |
c59f5d1b JH |
607 | } |
608 | } | |
609 | ||
812dbce5 | 610 | /* Produce the global information by preforming a transitive closure |
46c30019 | 611 | on the local information that was produced by ipa_analyze_function */ |
812dbce5 JH |
612 | |
613 | static unsigned int | |
614 | propagate (void) | |
615 | { | |
616 | struct cgraph_node *node; | |
617 | struct cgraph_node *w; | |
618 | struct cgraph_node **order = | |
619 | XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); | |
af8bca3c | 620 | int order_pos; |
812dbce5 JH |
621 | int i; |
622 | ||
b8698a0f | 623 | if (dump_file) |
812dbce5 | 624 | dump_cgraph (dump_file); |
ea900239 | 625 | |
46c30019 | 626 | ipa_discover_readonly_nonaddressable_vars (); |
5f902d76 JH |
627 | generate_summary (); |
628 | ||
ea900239 DB |
629 | /* Propagate the local information thru the call graph to produce |
630 | the global information. All the nodes within a cycle will have | |
631 | the same info so we collapse cycles first. Then we can do the | |
632 | propagation in one pass from the leaves to the roots. */ | |
af8bca3c | 633 | order_pos = ipa_reduced_postorder (order, true, true, NULL); |
ea900239 | 634 | if (dump_file) |
af8bca3c | 635 | ipa_print_order (dump_file, "reduced", order, order_pos); |
ea900239 DB |
636 | |
637 | for (i = 0; i < order_pos; i++ ) | |
638 | { | |
639 | ipa_reference_vars_info_t node_info; | |
46c30019 | 640 | ipa_reference_global_vars_info_t node_g; |
ea900239 | 641 | ipa_reference_local_vars_info_t node_l; |
22a8d1e6 | 642 | struct cgraph_edge *e, *ie; |
b8698a0f | 643 | |
ea900239 DB |
644 | bool read_all; |
645 | bool write_all; | |
646 | struct ipa_dfs_info * w_info; | |
647 | ||
648 | node = order[i]; | |
71fb4f92 JH |
649 | if (node->alias) |
650 | continue; | |
e2c9111c | 651 | node_info = get_reference_vars_info (node); |
22a8d1e6 | 652 | gcc_assert (node_info); |
ea900239 | 653 | |
46a4da10 JH |
654 | |
655 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
656 | fprintf (dump_file, "Starting cycle with %s/%i\n", | |
657 | cgraph_node_name (node), node->uid); | |
658 | ||
46c30019 JH |
659 | node_l = &node_info->local; |
660 | node_g = &node_info->global; | |
ea900239 | 661 | |
22a8d1e6 JH |
662 | read_all = false; |
663 | write_all = false; | |
ea900239 | 664 | |
61502ca8 | 665 | /* When function is overwritable, we can not assume anything. */ |
c59f5d1b | 666 | if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) |
22a8d1e6 | 667 | read_write_all_from_decl (node, &read_all, &write_all); |
c59f5d1b | 668 | |
b8698a0f | 669 | for (e = node->callees; e; e = e->next_callee) |
fede8efa JH |
670 | { |
671 | enum availability avail; | |
672 | struct cgraph_node *callee = cgraph_function_node (e->callee, &avail); | |
673 | if (!callee || avail <= AVAIL_OVERWRITABLE) | |
674 | read_write_all_from_decl (callee, &read_all, &write_all); | |
675 | } | |
22a8d1e6 JH |
676 | |
677 | for (ie = node->indirect_calls; ie; ie = ie->next_callee) | |
678 | if (!(ie->indirect_info->ecf_flags & ECF_CONST)) | |
679 | { | |
680 | read_all = true; | |
46a4da10 JH |
681 | if (dump_file && (dump_flags & TDF_DETAILS)) |
682 | fprintf (dump_file, " indirect call -> read all\n"); | |
22a8d1e6 JH |
683 | if (!cgraph_edge_cannot_lead_to_return (ie) |
684 | && !(ie->indirect_info->ecf_flags & ECF_PURE)) | |
46a4da10 JH |
685 | { |
686 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
687 | fprintf (dump_file, " indirect call -> write all\n"); | |
688 | write_all = true; | |
689 | } | |
22a8d1e6 | 690 | } |
c59f5d1b JH |
691 | |
692 | ||
22a8d1e6 | 693 | /* If any node in a cycle is read_all or write_all |
ea900239 | 694 | they all are. */ |
960bfb69 | 695 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
ea900239 | 696 | w = w_info->next_cycle; |
22a8d1e6 | 697 | while (w && (!read_all || !write_all)) |
ea900239 | 698 | { |
46a4da10 JH |
699 | if (dump_file && (dump_flags & TDF_DETAILS)) |
700 | fprintf (dump_file, " Visiting %s/%i\n", | |
701 | cgraph_node_name (w), w->uid); | |
61502ca8 | 702 | /* When function is overwritable, we can not assume anything. */ |
c59f5d1b | 703 | if (cgraph_function_body_availability (w) <= AVAIL_OVERWRITABLE) |
22a8d1e6 | 704 | read_write_all_from_decl (w, &read_all, &write_all); |
c59f5d1b | 705 | |
b8698a0f | 706 | for (e = w->callees; e; e = e->next_callee) |
fede8efa JH |
707 | { |
708 | enum availability avail; | |
709 | struct cgraph_node *callee = cgraph_function_node (e->callee, &avail); | |
710 | ||
711 | if (avail <= AVAIL_OVERWRITABLE) | |
712 | read_write_all_from_decl (callee, &read_all, &write_all); | |
713 | } | |
c59f5d1b | 714 | |
22a8d1e6 JH |
715 | for (ie = w->indirect_calls; ie; ie = ie->next_callee) |
716 | if (!(ie->indirect_info->ecf_flags & ECF_CONST)) | |
717 | { | |
718 | read_all = true; | |
46a4da10 JH |
719 | if (dump_file && (dump_flags & TDF_DETAILS)) |
720 | fprintf (dump_file, " indirect call -> read all\n"); | |
22a8d1e6 JH |
721 | if (!cgraph_edge_cannot_lead_to_return (ie) |
722 | && !(ie->indirect_info->ecf_flags & ECF_PURE)) | |
46a4da10 JH |
723 | { |
724 | write_all = true; | |
725 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
726 | fprintf (dump_file, " indirect call -> write all\n"); | |
727 | } | |
22a8d1e6 | 728 | } |
ea900239 | 729 | |
960bfb69 | 730 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
ea900239 DB |
731 | w = w_info->next_cycle; |
732 | } | |
733 | ||
c59f5d1b | 734 | |
ea900239 | 735 | /* Initialized the bitmaps for the reduced nodes */ |
b8698a0f | 736 | if (read_all) |
ea900239 | 737 | node_g->statics_read = all_module_statics; |
b8698a0f | 738 | else |
ea900239 | 739 | { |
46c30019 | 740 | node_g->statics_read = BITMAP_ALLOC (&local_info_obstack); |
b8698a0f | 741 | bitmap_copy (node_g->statics_read, |
ea900239 DB |
742 | node_l->statics_read); |
743 | } | |
b8698a0f | 744 | if (write_all) |
ea900239 DB |
745 | node_g->statics_written = all_module_statics; |
746 | else | |
747 | { | |
46c30019 | 748 | node_g->statics_written = BITMAP_ALLOC (&local_info_obstack); |
b8698a0f | 749 | bitmap_copy (node_g->statics_written, |
ea900239 DB |
750 | node_l->statics_written); |
751 | } | |
752 | ||
e2c9111c | 753 | propagate_bits (node_g, node); |
960bfb69 | 754 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
ea900239 | 755 | w = w_info->next_cycle; |
22a8d1e6 | 756 | while (w && (!read_all || !write_all)) |
ea900239 | 757 | { |
b8698a0f | 758 | ipa_reference_vars_info_t w_ri = |
e2c9111c | 759 | get_reference_vars_info (w); |
46c30019 | 760 | ipa_reference_local_vars_info_t w_l = &w_ri->local; |
960bfb69 | 761 | int flags = flags_from_decl_or_type (w->symbol.decl); |
b8698a0f | 762 | |
ea900239 DB |
763 | /* These global bitmaps are initialized from the local info |
764 | of all of the nodes in the region. However there is no | |
765 | need to do any work if the bitmaps were set to | |
766 | all_module_statics. */ | |
22a8d1e6 | 767 | if (!read_all && !(flags & ECF_CONST)) |
ea900239 DB |
768 | bitmap_ior_into (node_g->statics_read, |
769 | w_l->statics_read); | |
22a8d1e6 JH |
770 | if (!write_all |
771 | && !(flags & ECF_PURE) | |
772 | && !cgraph_node_cannot_return (w)) | |
ea900239 DB |
773 | bitmap_ior_into (node_g->statics_written, |
774 | w_l->statics_written); | |
e2c9111c | 775 | propagate_bits (node_g, w); |
960bfb69 | 776 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
ea900239 DB |
777 | w = w_info->next_cycle; |
778 | } | |
779 | ||
e2c9111c | 780 | /* All nodes within a cycle have the same global info bitmaps. */ |
46c30019 | 781 | node_info->global = *node_g; |
960bfb69 | 782 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
ea900239 DB |
783 | w = w_info->next_cycle; |
784 | while (w) | |
785 | { | |
b8698a0f | 786 | ipa_reference_vars_info_t w_ri = |
e2c9111c JH |
787 | get_reference_vars_info (w); |
788 | ||
46c30019 | 789 | w_ri->global = *node_g; |
e2c9111c | 790 | |
960bfb69 | 791 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
ea900239 DB |
792 | w = w_info->next_cycle; |
793 | } | |
794 | } | |
795 | ||
796 | if (dump_file) | |
797 | { | |
798 | for (i = 0; i < order_pos; i++ ) | |
799 | { | |
800 | ipa_reference_vars_info_t node_info; | |
801 | ipa_reference_global_vars_info_t node_g; | |
802 | ipa_reference_local_vars_info_t node_l; | |
803 | unsigned int index; | |
804 | bitmap_iterator bi; | |
805 | struct ipa_dfs_info * w_info; | |
806 | ||
807 | node = order[i]; | |
71fb4f92 JH |
808 | if (node->alias) |
809 | continue; | |
e2c9111c | 810 | node_info = get_reference_vars_info (node); |
46c30019 JH |
811 | node_g = &node_info->global; |
812 | node_l = &node_info->local; | |
b8698a0f L |
813 | fprintf (dump_file, |
814 | "\nFunction name:%s/%i:", | |
ea900239 DB |
815 | cgraph_node_name (node), node->uid); |
816 | fprintf (dump_file, "\n locals read: "); | |
8b583a06 JH |
817 | if (node_l->statics_read) |
818 | EXECUTE_IF_SET_IN_BITMAP (node_l->statics_read, | |
819 | 0, index, bi) | |
820 | { | |
821 | fprintf (dump_file, "%s ", | |
822 | get_static_name (index)); | |
823 | } | |
ea900239 | 824 | fprintf (dump_file, "\n locals written: "); |
8b583a06 JH |
825 | if (node_l->statics_written) |
826 | EXECUTE_IF_SET_IN_BITMAP (node_l->statics_written, | |
827 | 0, index, bi) | |
828 | { | |
829 | fprintf(dump_file, "%s ", | |
830 | get_static_name (index)); | |
831 | } | |
ea900239 | 832 | |
960bfb69 | 833 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
ea900239 | 834 | w = w_info->next_cycle; |
b8698a0f | 835 | while (w) |
ea900239 | 836 | { |
b8698a0f | 837 | ipa_reference_vars_info_t w_ri = |
e2c9111c | 838 | get_reference_vars_info (w); |
46c30019 | 839 | ipa_reference_local_vars_info_t w_l = &w_ri->local; |
ea900239 DB |
840 | fprintf (dump_file, "\n next cycle: %s/%i ", |
841 | cgraph_node_name (w), w->uid); | |
40513dd3 JJ |
842 | fprintf (dump_file, "\n locals read: "); |
843 | if (w_l->statics_read) | |
844 | EXECUTE_IF_SET_IN_BITMAP (w_l->statics_read, | |
845 | 0, index, bi) | |
846 | { | |
847 | fprintf (dump_file, "%s ", | |
848 | get_static_name (index)); | |
849 | } | |
ea900239 DB |
850 | |
851 | fprintf (dump_file, "\n locals written: "); | |
40513dd3 JJ |
852 | if (w_l->statics_written) |
853 | EXECUTE_IF_SET_IN_BITMAP (w_l->statics_written, | |
854 | 0, index, bi) | |
855 | { | |
856 | fprintf (dump_file, "%s ", | |
857 | get_static_name (index)); | |
858 | } | |
ea900239 | 859 | |
960bfb69 | 860 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
ea900239 DB |
861 | w = w_info->next_cycle; |
862 | } | |
863 | fprintf (dump_file, "\n globals read: "); | |
8b583a06 JH |
864 | if (node_g->statics_read == all_module_statics) |
865 | fprintf (dump_file, "ALL"); | |
866 | else | |
867 | EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read, | |
868 | 0, index, bi) | |
869 | { | |
870 | fprintf (dump_file, "%s ", | |
871 | get_static_name (index)); | |
872 | } | |
ea900239 | 873 | fprintf (dump_file, "\n globals written: "); |
8b583a06 JH |
874 | if (node_g->statics_written == all_module_statics) |
875 | fprintf (dump_file, "ALL"); | |
876 | else | |
877 | EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written, | |
878 | 0, index, bi) | |
879 | { | |
880 | fprintf (dump_file, "%s ", | |
881 | get_static_name (index)); | |
882 | } | |
ea900239 DB |
883 | } |
884 | } | |
885 | ||
886 | /* Cleanup. */ | |
58efc3ac | 887 | for (node = cgraph_nodes; node; node = node->next) |
ea900239 DB |
888 | { |
889 | ipa_reference_vars_info_t node_info; | |
890 | ipa_reference_global_vars_info_t node_g; | |
46c30019 JH |
891 | ipa_reference_optimization_summary_t opt; |
892 | ||
71fb4f92 | 893 | if (!node->analyzed || node->alias) |
58efc3ac JH |
894 | continue; |
895 | ||
e2c9111c | 896 | node_info = get_reference_vars_info (node); |
46a4da10 | 897 | if (cgraph_function_body_availability (node) > AVAIL_OVERWRITABLE |
960bfb69 | 898 | || (flags_from_decl_or_type (node->symbol.decl) & ECF_LEAF)) |
46c30019 JH |
899 | { |
900 | node_g = &node_info->global; | |
ea900239 | 901 | |
46c30019 JH |
902 | opt = XCNEW (struct ipa_reference_optimization_summary_d); |
903 | set_reference_optimization_summary (node, opt); | |
ea900239 | 904 | |
46c30019 | 905 | /* Create the complimentary sets. */ |
22a8d1e6 JH |
906 | |
907 | if (bitmap_empty_p (node_g->statics_read)) | |
908 | opt->statics_not_read = all_module_statics; | |
909 | else | |
910 | { | |
911 | opt->statics_not_read | |
912 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
913 | if (node_g->statics_read != all_module_statics) | |
914 | bitmap_and_compl (opt->statics_not_read, | |
915 | all_module_statics, | |
916 | node_g->statics_read); | |
917 | } | |
918 | ||
919 | if (bitmap_empty_p (node_g->statics_written)) | |
920 | opt->statics_not_written = all_module_statics; | |
921 | else | |
922 | { | |
923 | opt->statics_not_written | |
924 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
925 | if (node_g->statics_written != all_module_statics) | |
926 | bitmap_and_compl (opt->statics_not_written, | |
927 | all_module_statics, | |
928 | node_g->statics_written); | |
929 | } | |
46c30019 | 930 | } |
04695783 | 931 | free (node_info); |
46c30019 JH |
932 | } |
933 | ||
af8bca3c | 934 | ipa_free_postorder_info (); |
46c30019 | 935 | free (order); |
b8698a0f | 936 | |
ebcf9dc8 | 937 | bitmap_obstack_release (&local_info_obstack); |
46c30019 JH |
938 | VEC_free (ipa_reference_vars_info_t, heap, ipa_reference_vars_vector); |
939 | ipa_reference_vars_vector = NULL; | |
940 | if (dump_file) | |
941 | splay_tree_delete (reference_vars_to_consider); | |
942 | reference_vars_to_consider = NULL; | |
c2924966 | 943 | return 0; |
ea900239 DB |
944 | } |
945 | ||
f3380641 JH |
946 | /* Return true if we need to write summary of NODE. */ |
947 | ||
948 | static bool | |
949 | write_node_summary_p (struct cgraph_node *node, | |
950 | cgraph_node_set set, | |
951 | varpool_node_set vset, | |
952 | bitmap ltrans_statics) | |
953 | { | |
954 | ipa_reference_optimization_summary_t info; | |
955 | ||
956 | /* See if we have (non-empty) info. */ | |
957 | if (!node->analyzed || node->global.inlined_to) | |
958 | return false; | |
959 | info = get_reference_optimization_summary (node); | |
960 | if (!info || (bitmap_empty_p (info->statics_not_read) | |
961 | && bitmap_empty_p (info->statics_not_written))) | |
962 | return false; | |
963 | ||
964 | /* See if we want to encode it. | |
965 | Encode also referenced functions since constant folding might turn it into | |
966 | a direct call. | |
967 | ||
968 | In future we might also want to include summaries of functions references | |
969 | by initializers of constant variables references in current unit. */ | |
970 | if (!reachable_from_this_partition_p (node, set) | |
960bfb69 | 971 | && !referenced_from_this_partition_p (&node->symbol.ref_list, set, vset)) |
f3380641 JH |
972 | return false; |
973 | ||
974 | /* See if the info has non-empty intersections with vars we want to encode. */ | |
975 | if (!bitmap_intersect_p (info->statics_not_read, ltrans_statics) | |
976 | && !bitmap_intersect_p (info->statics_not_written, ltrans_statics)) | |
977 | return false; | |
978 | return true; | |
979 | } | |
980 | ||
22a8d1e6 JH |
981 | /* Stream out BITS<RANS_STATICS as list of decls to OB. |
982 | LTRANS_STATICS_BITCOUNT specify number of bits in LTRANS_STATICS | |
983 | or -1. When it is positive, just output -1 when | |
984 | BITS<RANS_STATICS == BITS<RANS_STATICS. */ | |
f3380641 JH |
985 | |
986 | static void | |
987 | stream_out_bitmap (struct lto_simple_output_block *ob, | |
22a8d1e6 JH |
988 | bitmap bits, bitmap ltrans_statics, |
989 | int ltrans_statics_bitcount) | |
f3380641 | 990 | { |
22a8d1e6 | 991 | int count = 0; |
f3380641 JH |
992 | unsigned int index; |
993 | bitmap_iterator bi; | |
22a8d1e6 JH |
994 | if (bits == all_module_statics) |
995 | { | |
412288f1 | 996 | streamer_write_hwi_stream (ob->main_stream, -1); |
22a8d1e6 JH |
997 | return; |
998 | } | |
f3380641 JH |
999 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) |
1000 | count ++; | |
22a8d1e6 JH |
1001 | if (count == ltrans_statics_bitcount) |
1002 | { | |
412288f1 | 1003 | streamer_write_hwi_stream (ob->main_stream, -1); |
22a8d1e6 JH |
1004 | return; |
1005 | } | |
412288f1 | 1006 | streamer_write_hwi_stream (ob->main_stream, count); |
f3380641 JH |
1007 | if (!count) |
1008 | return; | |
1009 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) | |
1010 | { | |
1011 | tree decl = (tree)splay_tree_lookup (reference_vars_to_consider, index)->value; | |
1012 | lto_output_var_decl_index(ob->decl_state, ob->main_stream, decl); | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | /* Serialize the ipa info for lto. */ | |
1017 | ||
1018 | static void | |
1019 | ipa_reference_write_optimization_summary (cgraph_node_set set, | |
1020 | varpool_node_set vset) | |
1021 | { | |
1022 | struct cgraph_node *node; | |
f3380641 JH |
1023 | struct lto_simple_output_block *ob |
1024 | = lto_create_simple_output_block (LTO_section_ipa_reference); | |
1025 | unsigned int count = 0; | |
22a8d1e6 | 1026 | int ltrans_statics_bitcount = 0; |
f3380641 | 1027 | lto_cgraph_encoder_t encoder = ob->decl_state->cgraph_node_encoder; |
22a8d1e6 | 1028 | lto_varpool_encoder_t varpool_encoder = ob->decl_state->varpool_node_encoder; |
f3380641 | 1029 | bitmap ltrans_statics = BITMAP_ALLOC (NULL); |
22a8d1e6 | 1030 | int i; |
f3380641 JH |
1031 | |
1032 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
1033 | ||
1034 | /* See what variables we are interested in. */ | |
22a8d1e6 JH |
1035 | for (i = 0; i < lto_varpool_encoder_size (varpool_encoder); i++) |
1036 | { | |
1037 | struct varpool_node *vnode = lto_varpool_encoder_deref (varpool_encoder, i); | |
960bfb69 | 1038 | if (!vnode->symbol.externally_visible |
22a8d1e6 | 1039 | && vnode->analyzed |
960bfb69 JH |
1040 | && bitmap_bit_p (all_module_statics, DECL_UID (vnode->symbol.decl)) |
1041 | && referenced_from_this_partition_p (&vnode->symbol.ref_list, set, vset)) | |
22a8d1e6 | 1042 | { |
960bfb69 | 1043 | tree decl = vnode->symbol.decl; |
22a8d1e6 JH |
1044 | bitmap_set_bit (ltrans_statics, DECL_UID (decl)); |
1045 | splay_tree_insert (reference_vars_to_consider, | |
1046 | DECL_UID (decl), (splay_tree_value)decl); | |
1047 | ltrans_statics_bitcount ++; | |
1048 | } | |
1049 | } | |
f3380641 | 1050 | |
22a8d1e6 JH |
1051 | |
1052 | if (ltrans_statics_bitcount) | |
1053 | for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) | |
1054 | if (write_node_summary_p (lto_cgraph_encoder_deref (encoder, i), | |
1055 | set, vset, ltrans_statics)) | |
1056 | count++; | |
f3380641 | 1057 | |
412288f1 | 1058 | streamer_write_uhwi_stream (ob->main_stream, count); |
22a8d1e6 JH |
1059 | if (count) |
1060 | stream_out_bitmap (ob, ltrans_statics, ltrans_statics, | |
1061 | -1); | |
f3380641 JH |
1062 | |
1063 | /* Process all of the functions. */ | |
22a8d1e6 JH |
1064 | if (ltrans_statics_bitcount) |
1065 | for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) | |
f3380641 | 1066 | { |
22a8d1e6 JH |
1067 | node = lto_cgraph_encoder_deref (encoder, i); |
1068 | if (write_node_summary_p (node, set, vset, ltrans_statics)) | |
1069 | { | |
1070 | ipa_reference_optimization_summary_t info; | |
1071 | int node_ref; | |
1072 | ||
1073 | info = get_reference_optimization_summary (node); | |
1074 | node_ref = lto_cgraph_encoder_encode (encoder, node); | |
412288f1 | 1075 | streamer_write_uhwi_stream (ob->main_stream, node_ref); |
22a8d1e6 JH |
1076 | |
1077 | stream_out_bitmap (ob, info->statics_not_read, ltrans_statics, | |
1078 | ltrans_statics_bitcount); | |
1079 | stream_out_bitmap (ob, info->statics_not_written, ltrans_statics, | |
1080 | ltrans_statics_bitcount); | |
1081 | } | |
f3380641 JH |
1082 | } |
1083 | BITMAP_FREE (ltrans_statics); | |
1084 | lto_destroy_simple_output_block (ob); | |
1085 | splay_tree_delete (reference_vars_to_consider); | |
1086 | } | |
1087 | ||
1088 | /* Deserialize the ipa info for lto. */ | |
1089 | ||
1090 | static void | |
1091 | ipa_reference_read_optimization_summary (void) | |
1092 | { | |
1093 | struct lto_file_decl_data ** file_data_vec | |
1094 | = lto_get_file_decl_data (); | |
1095 | struct lto_file_decl_data * file_data; | |
1096 | unsigned int j = 0; | |
1097 | bitmap_obstack_initialize (&optimization_summary_obstack); | |
1098 | ||
1099 | node_removal_hook_holder = | |
1100 | cgraph_add_node_removal_hook (&remove_node_data, NULL); | |
1101 | node_duplication_hook_holder = | |
1102 | cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); | |
22a8d1e6 | 1103 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
f3380641 JH |
1104 | |
1105 | while ((file_data = file_data_vec[j++])) | |
1106 | { | |
1107 | const char *data; | |
1108 | size_t len; | |
1109 | struct lto_input_block *ib | |
1110 | = lto_create_simple_input_block (file_data, | |
1111 | LTO_section_ipa_reference, | |
1112 | &data, &len); | |
1113 | if (ib) | |
1114 | { | |
1115 | unsigned int i; | |
412288f1 | 1116 | unsigned int f_count = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1117 | int b_count; |
1118 | if (!f_count) | |
1119 | continue; | |
412288f1 | 1120 | b_count = streamer_read_hwi (ib); |
22a8d1e6 JH |
1121 | if (dump_file) |
1122 | fprintf (dump_file, "all module statics:"); | |
1123 | for (i = 0; i < (unsigned int)b_count; i++) | |
1124 | { | |
412288f1 | 1125 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1126 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1127 | var_index); | |
1128 | bitmap_set_bit (all_module_statics, DECL_UID (v_decl)); | |
1129 | if (dump_file) | |
1130 | fprintf (dump_file, " %s", | |
1131 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1132 | } | |
f3380641 JH |
1133 | |
1134 | for (i = 0; i < f_count; i++) | |
1135 | { | |
1136 | unsigned int j, index; | |
1137 | struct cgraph_node *node; | |
1138 | ipa_reference_optimization_summary_t info; | |
1139 | int v_count; | |
1140 | lto_cgraph_encoder_t encoder; | |
1141 | ||
412288f1 | 1142 | index = streamer_read_uhwi (ib); |
f3380641 JH |
1143 | encoder = file_data->cgraph_node_encoder; |
1144 | node = lto_cgraph_encoder_deref (encoder, index); | |
1145 | info = XCNEW (struct ipa_reference_optimization_summary_d); | |
1146 | set_reference_optimization_summary (node, info); | |
1147 | info->statics_not_read = BITMAP_ALLOC (&optimization_summary_obstack); | |
1148 | info->statics_not_written = BITMAP_ALLOC (&optimization_summary_obstack); | |
1149 | if (dump_file) | |
1150 | fprintf (dump_file, | |
1151 | "\nFunction name:%s/%i:\n static not read:", | |
1152 | cgraph_node_name (node), node->uid); | |
1153 | ||
1154 | /* Set the statics not read. */ | |
412288f1 | 1155 | v_count = streamer_read_hwi (ib); |
22a8d1e6 | 1156 | if (v_count == -1) |
f3380641 | 1157 | { |
22a8d1e6 | 1158 | info->statics_not_read = all_module_statics; |
f3380641 | 1159 | if (dump_file) |
22a8d1e6 | 1160 | fprintf (dump_file, " all module statics"); |
f3380641 | 1161 | } |
22a8d1e6 JH |
1162 | else |
1163 | for (j = 0; j < (unsigned int)v_count; j++) | |
1164 | { | |
412288f1 | 1165 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1166 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1167 | var_index); | |
1168 | bitmap_set_bit (info->statics_not_read, DECL_UID (v_decl)); | |
1169 | if (dump_file) | |
1170 | fprintf (dump_file, " %s", | |
1171 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1172 | } | |
f3380641 JH |
1173 | |
1174 | if (dump_file) | |
1175 | fprintf (dump_file, | |
1176 | "\n static not written:"); | |
1177 | /* Set the statics not written. */ | |
412288f1 | 1178 | v_count = streamer_read_hwi (ib); |
22a8d1e6 | 1179 | if (v_count == -1) |
f3380641 | 1180 | { |
22a8d1e6 | 1181 | info->statics_not_written = all_module_statics; |
f3380641 | 1182 | if (dump_file) |
22a8d1e6 | 1183 | fprintf (dump_file, " all module statics"); |
f3380641 | 1184 | } |
22a8d1e6 JH |
1185 | else |
1186 | for (j = 0; j < (unsigned int)v_count; j++) | |
1187 | { | |
412288f1 | 1188 | unsigned int var_index = streamer_read_uhwi (ib); |
22a8d1e6 JH |
1189 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1190 | var_index); | |
1191 | bitmap_set_bit (info->statics_not_written, DECL_UID (v_decl)); | |
1192 | if (dump_file) | |
1193 | fprintf (dump_file, " %s", | |
1194 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1195 | } | |
f3380641 JH |
1196 | if (dump_file) |
1197 | fprintf (dump_file, "\n"); | |
1198 | } | |
1199 | ||
1200 | lto_destroy_simple_input_block (file_data, | |
1201 | LTO_section_ipa_reference, | |
1202 | ib, data, len); | |
1203 | } | |
1204 | else | |
1205 | /* Fatal error here. We do not want to support compiling ltrans units with | |
1206 | different version of compiler or different flags than the WPA unit, so | |
1207 | this should never happen. */ | |
1208 | fatal_error ("ipa reference summary is missing in ltrans unit"); | |
1209 | } | |
1210 | } | |
ea900239 DB |
1211 | |
1212 | static bool | |
1213 | gate_reference (void) | |
1214 | { | |
7e8b322a | 1215 | return (flag_ipa_reference |
ea900239 | 1216 | /* Don't bother doing anything if the program has errors. */ |
1da2ed5f | 1217 | && !seen_error ()); |
ea900239 DB |
1218 | } |
1219 | ||
7e5487a2 | 1220 | struct ipa_opt_pass_d pass_ipa_reference = |
ea900239 | 1221 | { |
8ddbbcae | 1222 | { |
812dbce5 | 1223 | IPA_PASS, |
ea900239 DB |
1224 | "static-var", /* name */ |
1225 | gate_reference, /* gate */ | |
812dbce5 | 1226 | propagate, /* execute */ |
ea900239 DB |
1227 | NULL, /* sub */ |
1228 | NULL, /* next */ | |
1229 | 0, /* static_pass_number */ | |
1230 | TV_IPA_REFERENCE, /* tv_id */ | |
1231 | 0, /* properties_required */ | |
1232 | 0, /* properties_provided */ | |
1233 | 0, /* properties_destroyed */ | |
1234 | 0, /* todo_flags_start */ | |
8ddbbcae | 1235 | 0 /* todo_flags_finish */ |
812dbce5 | 1236 | }, |
5f902d76 JH |
1237 | NULL, /* generate_summary */ |
1238 | NULL, /* write_summary */ | |
1239 | NULL, /* read_summary */ | |
f3380641 JH |
1240 | ipa_reference_write_optimization_summary,/* write_optimization_summary */ |
1241 | ipa_reference_read_optimization_summary,/* read_optimization_summary */ | |
2c5721d9 | 1242 | NULL, /* stmt_fixup */ |
812dbce5 JH |
1243 | 0, /* TODOs */ |
1244 | NULL, /* function_transform */ | |
1245 | NULL /* variable_transform */ | |
ea900239 | 1246 | }; |