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f7d118a9 | 1 | /* Callgraph based analysis of static variables. |
7cf0dbf3 | 2 | Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010 |
3 | Free Software Foundation, Inc. | |
f7d118a9 | 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 | |
8c4c00c1 | 10 | Software Foundation; either version 3, or (at your option) any later |
f7d118a9 | 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 | |
8c4c00c1 | 19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
f7d118a9 | 21 | |
22 | /* This file gathers information about how variables whose scope is | |
48e1416a | 23 | confined to the compilation unit are used. |
f7d118a9 | 24 | |
8dfbf71d | 25 | The transitive call site specific clobber effects are computed |
f7d118a9 | 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 | |
8dfbf71d | 38 | information. */ |
f7d118a9 | 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" | |
5863771b | 50 | #include "splay-tree.h" |
f7d118a9 | 51 | #include "ggc.h" |
52 | #include "ipa-utils.h" | |
53 | #include "ipa-reference.h" | |
75a70cf9 | 54 | #include "gimple.h" |
f7d118a9 | 55 | #include "cgraph.h" |
56 | #include "output.h" | |
57 | #include "flags.h" | |
58 | #include "timevar.h" | |
59 | #include "diagnostic.h" | |
60 | #include "langhooks.h" | |
7f385784 | 61 | #include "data-streamer.h" |
7bfefa9d | 62 | #include "lto-streamer.h" |
63 | ||
7bfefa9d | 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); | |
f7d118a9 | 69 | |
86844d6c | 70 | /* The static variables defined within the compilation unit that are |
48e1416a | 71 | loaded or stored directly by function that owns this structure. */ |
86844d6c | 72 | |
48e1416a | 73 | struct ipa_reference_local_vars_info_d |
86844d6c | 74 | { |
75 | bitmap statics_read; | |
76 | bitmap statics_written; | |
86844d6c | 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 | |
db5a3693 | 82 | transitive closure of the functions that are called. */ |
86844d6c | 83 | |
84 | struct ipa_reference_global_vars_info_d | |
85 | { | |
86 | bitmap statics_read; | |
87 | bitmap statics_written; | |
db5a3693 | 88 | }; |
89 | ||
0a10fd82 | 90 | /* Information we save about every function after ipa-reference is completed. */ |
db5a3693 | 91 | |
92 | struct ipa_reference_optimization_summary_d | |
93 | { | |
86844d6c | 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; | |
db5a3693 | 100 | typedef struct ipa_reference_optimization_summary_d *ipa_reference_optimization_summary_t; |
101 | ||
48e1416a | 102 | struct ipa_reference_vars_info_d |
86844d6c | 103 | { |
db5a3693 | 104 | struct ipa_reference_local_vars_info_d local; |
105 | struct ipa_reference_global_vars_info_d global; | |
86844d6c | 106 | }; |
107 | ||
108 | typedef struct ipa_reference_vars_info_d *ipa_reference_vars_info_t; | |
109 | ||
f7d118a9 | 110 | /* This splay tree contains all of the static variables that are |
db5a3693 | 111 | being considered by the compilation level alias analysis. */ |
112 | static splay_tree reference_vars_to_consider; | |
f7d118a9 | 113 | |
f7d118a9 | 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 | ||
ed4f5c92 | 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. */ | |
db5a3693 | 123 | static bitmap_obstack optimization_summary_obstack; |
f7d118a9 | 124 | |
50828ed8 | 125 | /* Holders of ipa cgraph hooks: */ |
86844d6c | 126 | static struct cgraph_2node_hook_list *node_duplication_hook_holder; |
127 | static struct cgraph_node_hook_list *node_removal_hook_holder; | |
50828ed8 | 128 | |
86844d6c | 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; | |
db5a3693 | 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; | |
86844d6c | 136 | |
f7d118a9 | 137 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ |
138 | static inline ipa_reference_vars_info_t | |
86844d6c | 139 | get_reference_vars_info (struct cgraph_node *node) |
140 | { | |
141 | if (!ipa_reference_vars_vector | |
db5a3693 | 142 | || VEC_length (ipa_reference_vars_info_t, |
143 | ipa_reference_vars_vector) <= (unsigned int) node->uid) | |
86844d6c | 144 | return NULL; |
db5a3693 | 145 | return VEC_index (ipa_reference_vars_info_t, ipa_reference_vars_vector, |
146 | node->uid); | |
86844d6c | 147 | } |
148 | ||
149 | /* Return the ipa_reference_vars structure starting from the cgraph NODE. */ | |
db5a3693 | 150 | static inline ipa_reference_optimization_summary_t |
151 | get_reference_optimization_summary (struct cgraph_node *node) | |
f7d118a9 | 152 | { |
db5a3693 | 153 | if (!ipa_reference_opt_sum_vector |
154 | || (VEC_length (ipa_reference_optimization_summary_t, | |
d2d73492 | 155 | ipa_reference_opt_sum_vector) |
db5a3693 | 156 | <= (unsigned int) node->uid)) |
f7d118a9 | 157 | return NULL; |
db5a3693 | 158 | return VEC_index (ipa_reference_optimization_summary_t, ipa_reference_opt_sum_vector, |
159 | node->uid); | |
f7d118a9 | 160 | } |
161 | ||
db5a3693 | 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) | |
f7d118a9 | 166 | { |
db5a3693 | 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); | |
f7d118a9 | 174 | } |
175 | ||
db5a3693 | 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) | |
f7d118a9 | 180 | { |
db5a3693 | 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); | |
f7d118a9 | 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 | ||
48e1416a | 195 | bitmap |
196 | ipa_reference_get_not_read_global (struct cgraph_node *fn) | |
f7d118a9 | 197 | { |
db5a3693 | 198 | ipa_reference_optimization_summary_t info; |
199 | ||
b2c2e188 | 200 | info = get_reference_optimization_summary (cgraph_function_node (fn, NULL)); |
db5a3693 | 201 | if (info) |
202 | return info->statics_not_read; | |
7d0d0ce1 | 203 | else if (flags_from_decl_or_type (fn->symbol.decl) & ECF_LEAF) |
7bd95dfd | 204 | return all_module_statics; |
f7d118a9 | 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 | ||
48e1416a | 214 | bitmap |
215 | ipa_reference_get_not_written_global (struct cgraph_node *fn) | |
f7d118a9 | 216 | { |
db5a3693 | 217 | ipa_reference_optimization_summary_t info; |
218 | ||
219 | info = get_reference_optimization_summary (fn); | |
220 | if (info) | |
221 | return info->statics_not_written; | |
7d0d0ce1 | 222 | else if (flags_from_decl_or_type (fn->symbol.decl) & ECF_LEAF) |
7bd95dfd | 223 | return all_module_statics; |
f7d118a9 | 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 | ||
48e1416a | 233 | static inline void |
234 | add_static_var (tree var) | |
f7d118a9 | 235 | { |
236 | int uid = DECL_UID (var); | |
ed4f5c92 | 237 | gcc_assert (TREE_CODE (var) == VAR_DECL); |
346beec7 | 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); | |
f7d118a9 | 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 | ||
48e1416a | 247 | static inline bool |
f8b7e3ec | 248 | is_proper_for_analysis (tree t) |
f7d118a9 | 249 | { |
db5a3693 | 250 | /* We handle only variables whose address is never taken. */ |
251 | if (TREE_ADDRESSABLE (t)) | |
252 | return false; | |
d2d73492 | 253 | |
f7d118a9 | 254 | /* If the variable has the "used" attribute, treat it as if it had a |
255 | been touched by the devil. */ | |
83a23b05 | 256 | if (DECL_PRESERVE_P (t)) |
f7d118a9 | 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. */ | |
48e1416a | 261 | if (TREE_THIS_VOLATILE (t)) |
f7d118a9 | 262 | return false; |
263 | ||
d2d73492 | 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 | ||
9dd2d192 | 269 | /* We cannot touch decls where the type needs constructing. */ |
270 | if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (t))) | |
271 | return false; | |
272 | ||
f7d118a9 | 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. */ | |
d97be713 | 275 | if (all_module_statics |
276 | && !bitmap_bit_p (all_module_statics, DECL_UID (t))) | |
f7d118a9 | 277 | add_static_var (t); |
278 | ||
279 | return true; | |
280 | } | |
281 | ||
f7d118a9 | 282 | /* Lookup the tree node for the static variable that has UID and |
23943319 | 283 | convert the name to a string for debugging. */ |
f7d118a9 | 284 | |
285 | static const char * | |
286 | get_static_name (int index) | |
287 | { | |
48e1416a | 288 | splay_tree_node stn = |
f7d118a9 | 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 | ||
86844d6c | 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 | |
f7d118a9 | 297 | bitmap oring. */ |
298 | ||
299 | static void | |
86844d6c | 300 | propagate_bits (ipa_reference_global_vars_info_t x_global, struct cgraph_node *x) |
f7d118a9 | 301 | { |
f7d118a9 | 302 | struct cgraph_edge *e; |
48e1416a | 303 | for (e = x->callees; e; e = e->next_callee) |
f7d118a9 | 304 | { |
7bd95dfd | 305 | enum availability avail; |
b2c2e188 | 306 | struct cgraph_node *y = cgraph_function_node (e->callee, &avail); |
f7d118a9 | 307 | |
b2c2e188 | 308 | if (!y) |
309 | continue; | |
ef378c27 | 310 | /* Only look into nodes we can propagate something. */ |
7bd95dfd | 311 | if (avail > AVAIL_OVERWRITABLE |
312 | || (avail == AVAIL_OVERWRITABLE | |
7d0d0ce1 | 313 | && (flags_from_decl_or_type (y->symbol.decl) & ECF_LEAF))) |
f7d118a9 | 314 | { |
7d0d0ce1 | 315 | int flags = flags_from_decl_or_type (y->symbol.decl); |
86844d6c | 316 | if (get_reference_vars_info (y)) |
f7d118a9 | 317 | { |
48e1416a | 318 | ipa_reference_vars_info_t y_info |
86844d6c | 319 | = get_reference_vars_info (y); |
db5a3693 | 320 | ipa_reference_global_vars_info_t y_global = &y_info->global; |
86844d6c | 321 | |
322 | /* Calls in current cycle do not have global computed yet. */ | |
db5a3693 | 323 | if (!y_global->statics_read) |
86844d6c | 324 | continue; |
48e1416a | 325 | |
d2d73492 | 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 | ||
f7d118a9 | 331 | if (x_global->statics_read |
332 | != all_module_statics) | |
333 | { | |
48e1416a | 334 | if (y_global->statics_read |
f7d118a9 | 335 | == all_module_statics) |
336 | { | |
337 | BITMAP_FREE (x_global->statics_read); | |
48e1416a | 338 | x_global->statics_read |
f7d118a9 | 339 | = all_module_statics; |
340 | } | |
341 | /* Skip bitmaps that are pointer equal to node's bitmap | |
342 | (no reason to spin within the cycle). */ | |
48e1416a | 343 | else if (x_global->statics_read |
f7d118a9 | 344 | != y_global->statics_read) |
345 | bitmap_ior_into (x_global->statics_read, | |
346 | y_global->statics_read); | |
347 | } | |
48e1416a | 348 | |
d2d73492 | 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 | ||
48e1416a | 356 | if (x_global->statics_written |
f7d118a9 | 357 | != all_module_statics) |
358 | { | |
48e1416a | 359 | if (y_global->statics_written |
f7d118a9 | 360 | == all_module_statics) |
361 | { | |
362 | BITMAP_FREE (x_global->statics_written); | |
48e1416a | 363 | x_global->statics_written |
f7d118a9 | 364 | = all_module_statics; |
365 | } | |
366 | /* Skip bitmaps that are pointer equal to node's bitmap | |
367 | (no reason to spin within the cycle). */ | |
48e1416a | 368 | else if (x_global->statics_written |
f7d118a9 | 369 | != y_global->statics_written) |
370 | bitmap_ior_into (x_global->statics_written, | |
371 | y_global->statics_written); | |
372 | } | |
373 | } | |
48e1416a | 374 | else |
ed4f5c92 | 375 | gcc_unreachable (); |
f7d118a9 | 376 | } |
377 | } | |
378 | } | |
379 | ||
f7d118a9 | 380 | /* The init routine for analyzing global static variable usage. See |
381 | comments at top for description. */ | |
48e1416a | 382 | static void |
383 | ipa_init (void) | |
f7d118a9 | 384 | { |
7bfefa9d | 385 | static bool init_p = false; |
386 | ||
387 | if (init_p) | |
388 | return; | |
389 | ||
390 | init_p = true; | |
391 | ||
db5a3693 | 392 | if (dump_file) |
393 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
f7d118a9 | 394 | |
ed4f5c92 | 395 | bitmap_obstack_initialize (&local_info_obstack); |
db5a3693 | 396 | bitmap_obstack_initialize (&optimization_summary_obstack); |
d2d73492 | 397 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
2116cc0c | 398 | |
7bfefa9d | 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); | |
f7d118a9 | 403 | } |
404 | ||
7bfefa9d | 405 | |
cb886925 | 406 | /* Set up the persistent info for FN. */ |
f7d118a9 | 407 | |
cb886925 | 408 | static ipa_reference_local_vars_info_t |
409 | init_function_info (struct cgraph_node *fn) | |
f7d118a9 | 410 | { |
48e1416a | 411 | ipa_reference_vars_info_t info |
cda6870f | 412 | = XCNEW (struct ipa_reference_vars_info_d); |
f7d118a9 | 413 | |
414 | /* Add the info to the tree's annotation. */ | |
86844d6c | 415 | set_reference_vars_info (fn, info); |
f7d118a9 | 416 | |
db5a3693 | 417 | info->local.statics_read = BITMAP_ALLOC (&local_info_obstack); |
418 | info->local.statics_written = BITMAP_ALLOC (&local_info_obstack); | |
f7d118a9 | 419 | |
db5a3693 | 420 | return &info->local; |
cb886925 | 421 | } |
422 | ||
7bfefa9d | 423 | |
cb886925 | 424 | /* This is the main routine for finding the reference patterns for |
425 | global variables within a function FN. */ | |
7bfefa9d | 426 | |
cb886925 | 427 | static void |
428 | analyze_function (struct cgraph_node *fn) | |
429 | { | |
f589330e | 430 | ipa_reference_local_vars_info_t local; |
f8b7e3ec | 431 | struct ipa_ref *ref; |
432 | int i; | |
433 | tree var; | |
cb886925 | 434 | |
f8b7e3ec | 435 | local = init_function_info (fn); |
7d0d0ce1 | 436 | for (i = 0; ipa_ref_list_reference_iterate (&fn->symbol.ref_list, i, ref); i++) |
cb886925 | 437 | { |
f8b7e3ec | 438 | if (ref->refered_type != IPA_REF_VARPOOL) |
439 | continue; | |
7d0d0ce1 | 440 | var = ipa_ref_varpool_node (ref)->symbol.decl; |
441 | if (ipa_ref_varpool_node (ref)->symbol.externally_visible | |
f8b7e3ec | 442 | || !ipa_ref_varpool_node (ref)->analyzed |
443 | || !is_proper_for_analysis (var)) | |
444 | continue; | |
445 | switch (ref->use) | |
cb886925 | 446 | { |
f8b7e3ec | 447 | case IPA_REF_LOAD: |
448 | bitmap_set_bit (local->statics_read, DECL_UID (var)); | |
449 | break; | |
450 | case IPA_REF_STORE: | |
023a28e1 | 451 | if (ipa_ref_cannot_lead_to_return (ref)) |
452 | break; | |
f8b7e3ec | 453 | bitmap_set_bit (local->statics_written, DECL_UID (var)); |
f8b7e3ec | 454 | break; |
455 | case IPA_REF_ADDR: | |
d2d73492 | 456 | gcc_unreachable (); |
f8b7e3ec | 457 | break; |
cb886925 | 458 | } |
cb886925 | 459 | } |
f7d118a9 | 460 | |
d2d73492 | 461 | if (cgraph_node_cannot_return (fn)) |
462 | bitmap_clear (local->statics_written); | |
f7d118a9 | 463 | } |
464 | ||
86844d6c | 465 | static bitmap |
466 | copy_global_bitmap (bitmap src) | |
467 | { | |
468 | bitmap dst; | |
469 | if (!src) | |
470 | return NULL; | |
d2d73492 | 471 | if (src == all_module_statics) |
472 | return all_module_statics; | |
db5a3693 | 473 | dst = BITMAP_ALLOC (&optimization_summary_obstack); |
86844d6c | 474 | bitmap_copy (dst, src); |
475 | return dst; | |
476 | } | |
477 | ||
f8b7e3ec | 478 | |
86844d6c | 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 | { | |
db5a3693 | 485 | ipa_reference_optimization_summary_t ginfo; |
486 | ipa_reference_optimization_summary_t dst_ginfo; | |
86844d6c | 487 | |
db5a3693 | 488 | ginfo = get_reference_optimization_summary (src); |
f8b7e3ec | 489 | if (!ginfo) |
86844d6c | 490 | return; |
db5a3693 | 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); | |
86844d6c | 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 | { | |
db5a3693 | 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 | } | |
86844d6c | 516 | } |
517 | ||
cb886925 | 518 | /* Analyze each function in the cgraph to see which global or statics |
519 | are read or written. */ | |
520 | ||
48e1416a | 521 | static void |
cb886925 | 522 | generate_summary (void) |
f7d118a9 | 523 | { |
524 | struct cgraph_node *node; | |
cb886925 | 525 | unsigned int index; |
526 | bitmap_iterator bi; | |
cb886925 | 527 | bitmap bm_temp; |
48e1416a | 528 | |
f7d118a9 | 529 | ipa_init (); |
ed4f5c92 | 530 | bm_temp = BITMAP_ALLOC (&local_info_obstack); |
f7d118a9 | 531 | |
f8b7e3ec | 532 | /* Process all of the functions next. */ |
7c455d87 | 533 | FOR_EACH_DEFINED_FUNCTION (node) |
534 | analyze_function (node); | |
f7d118a9 | 535 | |
cb886925 | 536 | if (dump_file) |
f7d118a9 | 537 | EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi) |
538 | { | |
cb886925 | 539 | fprintf (dump_file, "\nPromotable global:%s", |
540 | get_static_name (index)); | |
f7d118a9 | 541 | } |
48e1416a | 542 | |
cb886925 | 543 | BITMAP_FREE(bm_temp); |
48e1416a | 544 | |
f7d118a9 | 545 | if (dump_file) |
7c455d87 | 546 | FOR_EACH_DEFINED_FUNCTION (node) |
86844d6c | 547 | if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE) |
f7d118a9 | 548 | { |
f7d118a9 | 549 | ipa_reference_local_vars_info_t l; |
cb886925 | 550 | unsigned int index; |
f7d118a9 | 551 | bitmap_iterator bi; |
48e1416a | 552 | |
db5a3693 | 553 | l = &get_reference_vars_info (node)->local; |
48e1416a | 554 | fprintf (dump_file, |
555 | "\nFunction name:%s/%i:", | |
f7d118a9 | 556 | cgraph_node_name (node), node->uid); |
557 | fprintf (dump_file, "\n locals read: "); | |
f589330e | 558 | if (l->statics_read) |
559 | EXECUTE_IF_SET_IN_BITMAP (l->statics_read, | |
560 | 0, index, bi) | |
561 | { | |
562 | fprintf (dump_file, "%s ", | |
563 | get_static_name (index)); | |
564 | } | |
f7d118a9 | 565 | fprintf (dump_file, "\n locals written: "); |
f589330e | 566 | if (l->statics_written) |
567 | EXECUTE_IF_SET_IN_BITMAP (l->statics_written, | |
568 | 0, index, bi) | |
569 | { | |
570 | fprintf(dump_file, "%s ", | |
571 | get_static_name (index)); | |
572 | } | |
f7d118a9 | 573 | } |
cb886925 | 574 | } |
575 | \f | |
d2d73492 | 576 | /* Set READ_ALL/WRITE_ALL based on decl flags of NODE. */ |
db5a3693 | 577 | |
ef378c27 | 578 | static void |
d2d73492 | 579 | read_write_all_from_decl (struct cgraph_node *node, bool * read_all, |
580 | bool * write_all) | |
ef378c27 | 581 | { |
7d0d0ce1 | 582 | tree decl = node->symbol.decl; |
ef378c27 | 583 | int flags = flags_from_decl_or_type (decl); |
7bd95dfd | 584 | if ((flags & ECF_LEAF) |
585 | && cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) | |
586 | ; | |
587 | else if (flags & ECF_CONST) | |
ef378c27 | 588 | ; |
d2d73492 | 589 | else if ((flags & ECF_PURE) |
590 | || cgraph_node_cannot_return (node)) | |
7bd95dfd | 591 | { |
592 | *read_all = true; | |
593 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
594 | fprintf (dump_file, " %s/%i -> read all\n", | |
595 | cgraph_node_name (node), node->uid); | |
596 | } | |
ef378c27 | 597 | else |
598 | { | |
599 | /* TODO: To be able to produce sane results, we should also handle | |
db5a3693 | 600 | common builtins, in particular throw. */ |
ef378c27 | 601 | *read_all = true; |
d2d73492 | 602 | *write_all = true; |
7bd95dfd | 603 | if (dump_file && (dump_flags & TDF_DETAILS)) |
604 | fprintf (dump_file, " %s/%i -> read all, write all\n", | |
605 | cgraph_node_name (node), node->uid); | |
ef378c27 | 606 | } |
607 | } | |
608 | ||
cb886925 | 609 | /* Produce the global information by preforming a transitive closure |
db5a3693 | 610 | on the local information that was produced by ipa_analyze_function */ |
cb886925 | 611 | |
612 | static unsigned int | |
613 | propagate (void) | |
614 | { | |
615 | struct cgraph_node *node; | |
616 | struct cgraph_node *w; | |
617 | struct cgraph_node **order = | |
618 | XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); | |
7771d558 | 619 | int order_pos; |
cb886925 | 620 | int i; |
621 | ||
48e1416a | 622 | if (dump_file) |
cb886925 | 623 | dump_cgraph (dump_file); |
f7d118a9 | 624 | |
db5a3693 | 625 | ipa_discover_readonly_nonaddressable_vars (); |
f8b7e3ec | 626 | generate_summary (); |
627 | ||
f7d118a9 | 628 | /* Propagate the local information thru the call graph to produce |
629 | the global information. All the nodes within a cycle will have | |
630 | the same info so we collapse cycles first. Then we can do the | |
631 | propagation in one pass from the leaves to the roots. */ | |
7771d558 | 632 | order_pos = ipa_reduced_postorder (order, true, true, NULL); |
f7d118a9 | 633 | if (dump_file) |
7771d558 | 634 | ipa_print_order (dump_file, "reduced", order, order_pos); |
f7d118a9 | 635 | |
636 | for (i = 0; i < order_pos; i++ ) | |
637 | { | |
638 | ipa_reference_vars_info_t node_info; | |
db5a3693 | 639 | ipa_reference_global_vars_info_t node_g; |
f7d118a9 | 640 | ipa_reference_local_vars_info_t node_l; |
d2d73492 | 641 | struct cgraph_edge *e, *ie; |
48e1416a | 642 | |
f7d118a9 | 643 | bool read_all; |
644 | bool write_all; | |
645 | struct ipa_dfs_info * w_info; | |
646 | ||
647 | node = order[i]; | |
8c1fce46 | 648 | if (node->alias) |
649 | continue; | |
86844d6c | 650 | node_info = get_reference_vars_info (node); |
d2d73492 | 651 | gcc_assert (node_info); |
f7d118a9 | 652 | |
7bd95dfd | 653 | |
654 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
655 | fprintf (dump_file, "Starting cycle with %s/%i\n", | |
656 | cgraph_node_name (node), node->uid); | |
657 | ||
db5a3693 | 658 | node_l = &node_info->local; |
659 | node_g = &node_info->global; | |
f7d118a9 | 660 | |
d2d73492 | 661 | read_all = false; |
662 | write_all = false; | |
f7d118a9 | 663 | |
0a10fd82 | 664 | /* When function is overwritable, we can not assume anything. */ |
ef378c27 | 665 | if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) |
d2d73492 | 666 | read_write_all_from_decl (node, &read_all, &write_all); |
ef378c27 | 667 | |
48e1416a | 668 | for (e = node->callees; e; e = e->next_callee) |
b2c2e188 | 669 | { |
670 | enum availability avail; | |
671 | struct cgraph_node *callee = cgraph_function_node (e->callee, &avail); | |
672 | if (!callee || avail <= AVAIL_OVERWRITABLE) | |
673 | read_write_all_from_decl (callee, &read_all, &write_all); | |
674 | } | |
d2d73492 | 675 | |
676 | for (ie = node->indirect_calls; ie; ie = ie->next_callee) | |
677 | if (!(ie->indirect_info->ecf_flags & ECF_CONST)) | |
678 | { | |
679 | read_all = true; | |
7bd95dfd | 680 | if (dump_file && (dump_flags & TDF_DETAILS)) |
681 | fprintf (dump_file, " indirect call -> read all\n"); | |
d2d73492 | 682 | if (!cgraph_edge_cannot_lead_to_return (ie) |
683 | && !(ie->indirect_info->ecf_flags & ECF_PURE)) | |
7bd95dfd | 684 | { |
685 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
686 | fprintf (dump_file, " indirect call -> write all\n"); | |
687 | write_all = true; | |
688 | } | |
d2d73492 | 689 | } |
ef378c27 | 690 | |
691 | ||
d2d73492 | 692 | /* If any node in a cycle is read_all or write_all |
f7d118a9 | 693 | they all are. */ |
7d0d0ce1 | 694 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
f7d118a9 | 695 | w = w_info->next_cycle; |
d2d73492 | 696 | while (w && (!read_all || !write_all)) |
f7d118a9 | 697 | { |
7bd95dfd | 698 | if (dump_file && (dump_flags & TDF_DETAILS)) |
699 | fprintf (dump_file, " Visiting %s/%i\n", | |
700 | cgraph_node_name (w), w->uid); | |
0a10fd82 | 701 | /* When function is overwritable, we can not assume anything. */ |
ef378c27 | 702 | if (cgraph_function_body_availability (w) <= AVAIL_OVERWRITABLE) |
d2d73492 | 703 | read_write_all_from_decl (w, &read_all, &write_all); |
ef378c27 | 704 | |
48e1416a | 705 | for (e = w->callees; e; e = e->next_callee) |
b2c2e188 | 706 | { |
707 | enum availability avail; | |
708 | struct cgraph_node *callee = cgraph_function_node (e->callee, &avail); | |
709 | ||
710 | if (avail <= AVAIL_OVERWRITABLE) | |
711 | read_write_all_from_decl (callee, &read_all, &write_all); | |
712 | } | |
ef378c27 | 713 | |
d2d73492 | 714 | for (ie = w->indirect_calls; ie; ie = ie->next_callee) |
715 | if (!(ie->indirect_info->ecf_flags & ECF_CONST)) | |
716 | { | |
717 | read_all = true; | |
7bd95dfd | 718 | if (dump_file && (dump_flags & TDF_DETAILS)) |
719 | fprintf (dump_file, " indirect call -> read all\n"); | |
d2d73492 | 720 | if (!cgraph_edge_cannot_lead_to_return (ie) |
721 | && !(ie->indirect_info->ecf_flags & ECF_PURE)) | |
7bd95dfd | 722 | { |
723 | write_all = true; | |
724 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
725 | fprintf (dump_file, " indirect call -> write all\n"); | |
726 | } | |
d2d73492 | 727 | } |
f7d118a9 | 728 | |
7d0d0ce1 | 729 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
f7d118a9 | 730 | w = w_info->next_cycle; |
731 | } | |
732 | ||
ef378c27 | 733 | |
f7d118a9 | 734 | /* Initialized the bitmaps for the reduced nodes */ |
48e1416a | 735 | if (read_all) |
f7d118a9 | 736 | node_g->statics_read = all_module_statics; |
48e1416a | 737 | else |
f7d118a9 | 738 | { |
db5a3693 | 739 | node_g->statics_read = BITMAP_ALLOC (&local_info_obstack); |
48e1416a | 740 | bitmap_copy (node_g->statics_read, |
f7d118a9 | 741 | node_l->statics_read); |
742 | } | |
48e1416a | 743 | if (write_all) |
f7d118a9 | 744 | node_g->statics_written = all_module_statics; |
745 | else | |
746 | { | |
db5a3693 | 747 | node_g->statics_written = BITMAP_ALLOC (&local_info_obstack); |
48e1416a | 748 | bitmap_copy (node_g->statics_written, |
f7d118a9 | 749 | node_l->statics_written); |
750 | } | |
751 | ||
86844d6c | 752 | propagate_bits (node_g, node); |
7d0d0ce1 | 753 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
f7d118a9 | 754 | w = w_info->next_cycle; |
d2d73492 | 755 | while (w && (!read_all || !write_all)) |
f7d118a9 | 756 | { |
48e1416a | 757 | ipa_reference_vars_info_t w_ri = |
86844d6c | 758 | get_reference_vars_info (w); |
db5a3693 | 759 | ipa_reference_local_vars_info_t w_l = &w_ri->local; |
7d0d0ce1 | 760 | int flags = flags_from_decl_or_type (w->symbol.decl); |
48e1416a | 761 | |
f7d118a9 | 762 | /* These global bitmaps are initialized from the local info |
763 | of all of the nodes in the region. However there is no | |
764 | need to do any work if the bitmaps were set to | |
765 | all_module_statics. */ | |
d2d73492 | 766 | if (!read_all && !(flags & ECF_CONST)) |
f7d118a9 | 767 | bitmap_ior_into (node_g->statics_read, |
768 | w_l->statics_read); | |
d2d73492 | 769 | if (!write_all |
770 | && !(flags & ECF_PURE) | |
771 | && !cgraph_node_cannot_return (w)) | |
f7d118a9 | 772 | bitmap_ior_into (node_g->statics_written, |
773 | w_l->statics_written); | |
86844d6c | 774 | propagate_bits (node_g, w); |
7d0d0ce1 | 775 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
f7d118a9 | 776 | w = w_info->next_cycle; |
777 | } | |
778 | ||
86844d6c | 779 | /* All nodes within a cycle have the same global info bitmaps. */ |
db5a3693 | 780 | node_info->global = *node_g; |
7d0d0ce1 | 781 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
f7d118a9 | 782 | w = w_info->next_cycle; |
783 | while (w) | |
784 | { | |
48e1416a | 785 | ipa_reference_vars_info_t w_ri = |
86844d6c | 786 | get_reference_vars_info (w); |
787 | ||
db5a3693 | 788 | w_ri->global = *node_g; |
86844d6c | 789 | |
7d0d0ce1 | 790 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
f7d118a9 | 791 | w = w_info->next_cycle; |
792 | } | |
793 | } | |
794 | ||
795 | if (dump_file) | |
796 | { | |
797 | for (i = 0; i < order_pos; i++ ) | |
798 | { | |
799 | ipa_reference_vars_info_t node_info; | |
800 | ipa_reference_global_vars_info_t node_g; | |
801 | ipa_reference_local_vars_info_t node_l; | |
802 | unsigned int index; | |
803 | bitmap_iterator bi; | |
804 | struct ipa_dfs_info * w_info; | |
805 | ||
806 | node = order[i]; | |
8c1fce46 | 807 | if (node->alias) |
808 | continue; | |
86844d6c | 809 | node_info = get_reference_vars_info (node); |
db5a3693 | 810 | node_g = &node_info->global; |
811 | node_l = &node_info->local; | |
48e1416a | 812 | fprintf (dump_file, |
813 | "\nFunction name:%s/%i:", | |
f7d118a9 | 814 | cgraph_node_name (node), node->uid); |
815 | fprintf (dump_file, "\n locals read: "); | |
f589330e | 816 | if (node_l->statics_read) |
817 | EXECUTE_IF_SET_IN_BITMAP (node_l->statics_read, | |
818 | 0, index, bi) | |
819 | { | |
820 | fprintf (dump_file, "%s ", | |
821 | get_static_name (index)); | |
822 | } | |
f7d118a9 | 823 | fprintf (dump_file, "\n locals written: "); |
f589330e | 824 | if (node_l->statics_written) |
825 | EXECUTE_IF_SET_IN_BITMAP (node_l->statics_written, | |
826 | 0, index, bi) | |
827 | { | |
828 | fprintf(dump_file, "%s ", | |
829 | get_static_name (index)); | |
830 | } | |
f7d118a9 | 831 | |
7d0d0ce1 | 832 | w_info = (struct ipa_dfs_info *) node->symbol.aux; |
f7d118a9 | 833 | w = w_info->next_cycle; |
48e1416a | 834 | while (w) |
f7d118a9 | 835 | { |
48e1416a | 836 | ipa_reference_vars_info_t w_ri = |
86844d6c | 837 | get_reference_vars_info (w); |
db5a3693 | 838 | ipa_reference_local_vars_info_t w_l = &w_ri->local; |
f7d118a9 | 839 | fprintf (dump_file, "\n next cycle: %s/%i ", |
840 | cgraph_node_name (w), w->uid); | |
f565b705 | 841 | fprintf (dump_file, "\n locals read: "); |
842 | if (w_l->statics_read) | |
843 | EXECUTE_IF_SET_IN_BITMAP (w_l->statics_read, | |
844 | 0, index, bi) | |
845 | { | |
846 | fprintf (dump_file, "%s ", | |
847 | get_static_name (index)); | |
848 | } | |
f7d118a9 | 849 | |
850 | fprintf (dump_file, "\n locals written: "); | |
f565b705 | 851 | if (w_l->statics_written) |
852 | EXECUTE_IF_SET_IN_BITMAP (w_l->statics_written, | |
853 | 0, index, bi) | |
854 | { | |
855 | fprintf (dump_file, "%s ", | |
856 | get_static_name (index)); | |
857 | } | |
f7d118a9 | 858 | |
7d0d0ce1 | 859 | w_info = (struct ipa_dfs_info *) w->symbol.aux; |
f7d118a9 | 860 | w = w_info->next_cycle; |
861 | } | |
862 | fprintf (dump_file, "\n globals read: "); | |
f589330e | 863 | if (node_g->statics_read == all_module_statics) |
864 | fprintf (dump_file, "ALL"); | |
865 | else | |
866 | EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read, | |
867 | 0, index, bi) | |
868 | { | |
869 | fprintf (dump_file, "%s ", | |
870 | get_static_name (index)); | |
871 | } | |
f7d118a9 | 872 | fprintf (dump_file, "\n globals written: "); |
f589330e | 873 | if (node_g->statics_written == all_module_statics) |
874 | fprintf (dump_file, "ALL"); | |
875 | else | |
876 | EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written, | |
877 | 0, index, bi) | |
878 | { | |
879 | fprintf (dump_file, "%s ", | |
880 | get_static_name (index)); | |
881 | } | |
f7d118a9 | 882 | } |
883 | } | |
884 | ||
885 | /* Cleanup. */ | |
7c455d87 | 886 | FOR_EACH_DEFINED_FUNCTION (node) |
f7d118a9 | 887 | { |
888 | ipa_reference_vars_info_t node_info; | |
889 | ipa_reference_global_vars_info_t node_g; | |
db5a3693 | 890 | ipa_reference_optimization_summary_t opt; |
891 | ||
7c455d87 | 892 | if (node->alias) |
2ebf562c | 893 | continue; |
894 | ||
86844d6c | 895 | node_info = get_reference_vars_info (node); |
7bd95dfd | 896 | if (cgraph_function_body_availability (node) > AVAIL_OVERWRITABLE |
7d0d0ce1 | 897 | || (flags_from_decl_or_type (node->symbol.decl) & ECF_LEAF)) |
db5a3693 | 898 | { |
899 | node_g = &node_info->global; | |
f7d118a9 | 900 | |
db5a3693 | 901 | opt = XCNEW (struct ipa_reference_optimization_summary_d); |
902 | set_reference_optimization_summary (node, opt); | |
f7d118a9 | 903 | |
db5a3693 | 904 | /* Create the complimentary sets. */ |
d2d73492 | 905 | |
906 | if (bitmap_empty_p (node_g->statics_read)) | |
907 | opt->statics_not_read = all_module_statics; | |
908 | else | |
909 | { | |
910 | opt->statics_not_read | |
911 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
912 | if (node_g->statics_read != all_module_statics) | |
913 | bitmap_and_compl (opt->statics_not_read, | |
914 | all_module_statics, | |
915 | node_g->statics_read); | |
916 | } | |
917 | ||
918 | if (bitmap_empty_p (node_g->statics_written)) | |
919 | opt->statics_not_written = all_module_statics; | |
920 | else | |
921 | { | |
922 | opt->statics_not_written | |
923 | = BITMAP_ALLOC (&optimization_summary_obstack); | |
924 | if (node_g->statics_written != all_module_statics) | |
925 | bitmap_and_compl (opt->statics_not_written, | |
926 | all_module_statics, | |
927 | node_g->statics_written); | |
928 | } | |
db5a3693 | 929 | } |
dd045aee | 930 | free (node_info); |
db5a3693 | 931 | } |
932 | ||
7771d558 | 933 | ipa_free_postorder_info (); |
db5a3693 | 934 | free (order); |
48e1416a | 935 | |
ed4f5c92 | 936 | bitmap_obstack_release (&local_info_obstack); |
db5a3693 | 937 | VEC_free (ipa_reference_vars_info_t, heap, ipa_reference_vars_vector); |
938 | ipa_reference_vars_vector = NULL; | |
939 | if (dump_file) | |
940 | splay_tree_delete (reference_vars_to_consider); | |
941 | reference_vars_to_consider = NULL; | |
2a1990e9 | 942 | return 0; |
f7d118a9 | 943 | } |
944 | ||
d97be713 | 945 | /* Return true if we need to write summary of NODE. */ |
946 | ||
947 | static bool | |
948 | write_node_summary_p (struct cgraph_node *node, | |
949 | cgraph_node_set set, | |
950 | varpool_node_set vset, | |
951 | bitmap ltrans_statics) | |
952 | { | |
953 | ipa_reference_optimization_summary_t info; | |
954 | ||
955 | /* See if we have (non-empty) info. */ | |
956 | if (!node->analyzed || node->global.inlined_to) | |
957 | return false; | |
958 | info = get_reference_optimization_summary (node); | |
959 | if (!info || (bitmap_empty_p (info->statics_not_read) | |
960 | && bitmap_empty_p (info->statics_not_written))) | |
961 | return false; | |
962 | ||
963 | /* See if we want to encode it. | |
964 | Encode also referenced functions since constant folding might turn it into | |
965 | a direct call. | |
966 | ||
967 | In future we might also want to include summaries of functions references | |
968 | by initializers of constant variables references in current unit. */ | |
969 | if (!reachable_from_this_partition_p (node, set) | |
7d0d0ce1 | 970 | && !referenced_from_this_partition_p (&node->symbol.ref_list, set, vset)) |
d97be713 | 971 | return false; |
972 | ||
973 | /* See if the info has non-empty intersections with vars we want to encode. */ | |
974 | if (!bitmap_intersect_p (info->statics_not_read, ltrans_statics) | |
975 | && !bitmap_intersect_p (info->statics_not_written, ltrans_statics)) | |
976 | return false; | |
977 | return true; | |
978 | } | |
979 | ||
d2d73492 | 980 | /* Stream out BITS<RANS_STATICS as list of decls to OB. |
981 | LTRANS_STATICS_BITCOUNT specify number of bits in LTRANS_STATICS | |
982 | or -1. When it is positive, just output -1 when | |
983 | BITS<RANS_STATICS == BITS<RANS_STATICS. */ | |
d97be713 | 984 | |
985 | static void | |
986 | stream_out_bitmap (struct lto_simple_output_block *ob, | |
d2d73492 | 987 | bitmap bits, bitmap ltrans_statics, |
988 | int ltrans_statics_bitcount) | |
d97be713 | 989 | { |
d2d73492 | 990 | int count = 0; |
d97be713 | 991 | unsigned int index; |
992 | bitmap_iterator bi; | |
d2d73492 | 993 | if (bits == all_module_statics) |
994 | { | |
7f385784 | 995 | streamer_write_hwi_stream (ob->main_stream, -1); |
d2d73492 | 996 | return; |
997 | } | |
d97be713 | 998 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) |
999 | count ++; | |
d2d73492 | 1000 | if (count == ltrans_statics_bitcount) |
1001 | { | |
7f385784 | 1002 | streamer_write_hwi_stream (ob->main_stream, -1); |
d2d73492 | 1003 | return; |
1004 | } | |
7f385784 | 1005 | streamer_write_hwi_stream (ob->main_stream, count); |
d97be713 | 1006 | if (!count) |
1007 | return; | |
1008 | EXECUTE_IF_AND_IN_BITMAP (bits, ltrans_statics, 0, index, bi) | |
1009 | { | |
1010 | tree decl = (tree)splay_tree_lookup (reference_vars_to_consider, index)->value; | |
1011 | lto_output_var_decl_index(ob->decl_state, ob->main_stream, decl); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | /* Serialize the ipa info for lto. */ | |
1016 | ||
1017 | static void | |
1018 | ipa_reference_write_optimization_summary (cgraph_node_set set, | |
1019 | varpool_node_set vset) | |
1020 | { | |
1021 | struct cgraph_node *node; | |
d97be713 | 1022 | struct lto_simple_output_block *ob |
1023 | = lto_create_simple_output_block (LTO_section_ipa_reference); | |
1024 | unsigned int count = 0; | |
d2d73492 | 1025 | int ltrans_statics_bitcount = 0; |
d97be713 | 1026 | lto_cgraph_encoder_t encoder = ob->decl_state->cgraph_node_encoder; |
d2d73492 | 1027 | lto_varpool_encoder_t varpool_encoder = ob->decl_state->varpool_node_encoder; |
d97be713 | 1028 | bitmap ltrans_statics = BITMAP_ALLOC (NULL); |
d2d73492 | 1029 | int i; |
d97be713 | 1030 | |
1031 | reference_vars_to_consider = splay_tree_new (splay_tree_compare_ints, 0, 0); | |
1032 | ||
1033 | /* See what variables we are interested in. */ | |
d2d73492 | 1034 | for (i = 0; i < lto_varpool_encoder_size (varpool_encoder); i++) |
1035 | { | |
1036 | struct varpool_node *vnode = lto_varpool_encoder_deref (varpool_encoder, i); | |
7d0d0ce1 | 1037 | if (!vnode->symbol.externally_visible |
d2d73492 | 1038 | && vnode->analyzed |
7d0d0ce1 | 1039 | && bitmap_bit_p (all_module_statics, DECL_UID (vnode->symbol.decl)) |
1040 | && referenced_from_this_partition_p (&vnode->symbol.ref_list, set, vset)) | |
d2d73492 | 1041 | { |
7d0d0ce1 | 1042 | tree decl = vnode->symbol.decl; |
d2d73492 | 1043 | bitmap_set_bit (ltrans_statics, DECL_UID (decl)); |
1044 | splay_tree_insert (reference_vars_to_consider, | |
1045 | DECL_UID (decl), (splay_tree_value)decl); | |
1046 | ltrans_statics_bitcount ++; | |
1047 | } | |
1048 | } | |
d97be713 | 1049 | |
d2d73492 | 1050 | |
1051 | if (ltrans_statics_bitcount) | |
1052 | for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) | |
1053 | if (write_node_summary_p (lto_cgraph_encoder_deref (encoder, i), | |
1054 | set, vset, ltrans_statics)) | |
1055 | count++; | |
d97be713 | 1056 | |
7f385784 | 1057 | streamer_write_uhwi_stream (ob->main_stream, count); |
d2d73492 | 1058 | if (count) |
1059 | stream_out_bitmap (ob, ltrans_statics, ltrans_statics, | |
1060 | -1); | |
d97be713 | 1061 | |
1062 | /* Process all of the functions. */ | |
d2d73492 | 1063 | if (ltrans_statics_bitcount) |
1064 | for (i = 0; i < lto_cgraph_encoder_size (encoder); i++) | |
d97be713 | 1065 | { |
d2d73492 | 1066 | node = lto_cgraph_encoder_deref (encoder, i); |
1067 | if (write_node_summary_p (node, set, vset, ltrans_statics)) | |
1068 | { | |
1069 | ipa_reference_optimization_summary_t info; | |
1070 | int node_ref; | |
1071 | ||
1072 | info = get_reference_optimization_summary (node); | |
1073 | node_ref = lto_cgraph_encoder_encode (encoder, node); | |
7f385784 | 1074 | streamer_write_uhwi_stream (ob->main_stream, node_ref); |
d2d73492 | 1075 | |
1076 | stream_out_bitmap (ob, info->statics_not_read, ltrans_statics, | |
1077 | ltrans_statics_bitcount); | |
1078 | stream_out_bitmap (ob, info->statics_not_written, ltrans_statics, | |
1079 | ltrans_statics_bitcount); | |
1080 | } | |
d97be713 | 1081 | } |
1082 | BITMAP_FREE (ltrans_statics); | |
1083 | lto_destroy_simple_output_block (ob); | |
1084 | splay_tree_delete (reference_vars_to_consider); | |
1085 | } | |
1086 | ||
1087 | /* Deserialize the ipa info for lto. */ | |
1088 | ||
1089 | static void | |
1090 | ipa_reference_read_optimization_summary (void) | |
1091 | { | |
1092 | struct lto_file_decl_data ** file_data_vec | |
1093 | = lto_get_file_decl_data (); | |
1094 | struct lto_file_decl_data * file_data; | |
1095 | unsigned int j = 0; | |
1096 | bitmap_obstack_initialize (&optimization_summary_obstack); | |
1097 | ||
1098 | node_removal_hook_holder = | |
1099 | cgraph_add_node_removal_hook (&remove_node_data, NULL); | |
1100 | node_duplication_hook_holder = | |
1101 | cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); | |
d2d73492 | 1102 | all_module_statics = BITMAP_ALLOC (&optimization_summary_obstack); |
d97be713 | 1103 | |
1104 | while ((file_data = file_data_vec[j++])) | |
1105 | { | |
1106 | const char *data; | |
1107 | size_t len; | |
1108 | struct lto_input_block *ib | |
1109 | = lto_create_simple_input_block (file_data, | |
1110 | LTO_section_ipa_reference, | |
1111 | &data, &len); | |
1112 | if (ib) | |
1113 | { | |
1114 | unsigned int i; | |
7f385784 | 1115 | unsigned int f_count = streamer_read_uhwi (ib); |
d2d73492 | 1116 | int b_count; |
1117 | if (!f_count) | |
1118 | continue; | |
7f385784 | 1119 | b_count = streamer_read_hwi (ib); |
d2d73492 | 1120 | if (dump_file) |
1121 | fprintf (dump_file, "all module statics:"); | |
1122 | for (i = 0; i < (unsigned int)b_count; i++) | |
1123 | { | |
7f385784 | 1124 | unsigned int var_index = streamer_read_uhwi (ib); |
d2d73492 | 1125 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1126 | var_index); | |
1127 | bitmap_set_bit (all_module_statics, DECL_UID (v_decl)); | |
1128 | if (dump_file) | |
1129 | fprintf (dump_file, " %s", | |
1130 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1131 | } | |
d97be713 | 1132 | |
1133 | for (i = 0; i < f_count; i++) | |
1134 | { | |
1135 | unsigned int j, index; | |
1136 | struct cgraph_node *node; | |
1137 | ipa_reference_optimization_summary_t info; | |
1138 | int v_count; | |
1139 | lto_cgraph_encoder_t encoder; | |
1140 | ||
7f385784 | 1141 | index = streamer_read_uhwi (ib); |
d97be713 | 1142 | encoder = file_data->cgraph_node_encoder; |
1143 | node = lto_cgraph_encoder_deref (encoder, index); | |
1144 | info = XCNEW (struct ipa_reference_optimization_summary_d); | |
1145 | set_reference_optimization_summary (node, info); | |
1146 | info->statics_not_read = BITMAP_ALLOC (&optimization_summary_obstack); | |
1147 | info->statics_not_written = BITMAP_ALLOC (&optimization_summary_obstack); | |
1148 | if (dump_file) | |
1149 | fprintf (dump_file, | |
1150 | "\nFunction name:%s/%i:\n static not read:", | |
1151 | cgraph_node_name (node), node->uid); | |
1152 | ||
1153 | /* Set the statics not read. */ | |
7f385784 | 1154 | v_count = streamer_read_hwi (ib); |
d2d73492 | 1155 | if (v_count == -1) |
d97be713 | 1156 | { |
d2d73492 | 1157 | info->statics_not_read = all_module_statics; |
d97be713 | 1158 | if (dump_file) |
d2d73492 | 1159 | fprintf (dump_file, " all module statics"); |
d97be713 | 1160 | } |
d2d73492 | 1161 | else |
1162 | for (j = 0; j < (unsigned int)v_count; j++) | |
1163 | { | |
7f385784 | 1164 | unsigned int var_index = streamer_read_uhwi (ib); |
d2d73492 | 1165 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1166 | var_index); | |
1167 | bitmap_set_bit (info->statics_not_read, DECL_UID (v_decl)); | |
1168 | if (dump_file) | |
1169 | fprintf (dump_file, " %s", | |
1170 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1171 | } | |
d97be713 | 1172 | |
1173 | if (dump_file) | |
1174 | fprintf (dump_file, | |
1175 | "\n static not written:"); | |
1176 | /* Set the statics not written. */ | |
7f385784 | 1177 | v_count = streamer_read_hwi (ib); |
d2d73492 | 1178 | if (v_count == -1) |
d97be713 | 1179 | { |
d2d73492 | 1180 | info->statics_not_written = all_module_statics; |
d97be713 | 1181 | if (dump_file) |
d2d73492 | 1182 | fprintf (dump_file, " all module statics"); |
d97be713 | 1183 | } |
d2d73492 | 1184 | else |
1185 | for (j = 0; j < (unsigned int)v_count; j++) | |
1186 | { | |
7f385784 | 1187 | unsigned int var_index = streamer_read_uhwi (ib); |
d2d73492 | 1188 | tree v_decl = lto_file_decl_data_get_var_decl (file_data, |
1189 | var_index); | |
1190 | bitmap_set_bit (info->statics_not_written, DECL_UID (v_decl)); | |
1191 | if (dump_file) | |
1192 | fprintf (dump_file, " %s", | |
1193 | lang_hooks.decl_printable_name (v_decl, 2)); | |
1194 | } | |
d97be713 | 1195 | if (dump_file) |
1196 | fprintf (dump_file, "\n"); | |
1197 | } | |
1198 | ||
1199 | lto_destroy_simple_input_block (file_data, | |
1200 | LTO_section_ipa_reference, | |
1201 | ib, data, len); | |
1202 | } | |
1203 | else | |
1204 | /* Fatal error here. We do not want to support compiling ltrans units with | |
1205 | different version of compiler or different flags than the WPA unit, so | |
1206 | this should never happen. */ | |
1207 | fatal_error ("ipa reference summary is missing in ltrans unit"); | |
1208 | } | |
1209 | } | |
f7d118a9 | 1210 | |
1211 | static bool | |
1212 | gate_reference (void) | |
1213 | { | |
6329636b | 1214 | return (flag_ipa_reference |
f7d118a9 | 1215 | /* Don't bother doing anything if the program has errors. */ |
852f689e | 1216 | && !seen_error ()); |
f7d118a9 | 1217 | } |
1218 | ||
26dbec0a | 1219 | struct ipa_opt_pass_d pass_ipa_reference = |
f7d118a9 | 1220 | { |
20099e35 | 1221 | { |
cb886925 | 1222 | IPA_PASS, |
f7d118a9 | 1223 | "static-var", /* name */ |
1224 | gate_reference, /* gate */ | |
cb886925 | 1225 | propagate, /* execute */ |
f7d118a9 | 1226 | NULL, /* sub */ |
1227 | NULL, /* next */ | |
1228 | 0, /* static_pass_number */ | |
1229 | TV_IPA_REFERENCE, /* tv_id */ | |
1230 | 0, /* properties_required */ | |
1231 | 0, /* properties_provided */ | |
1232 | 0, /* properties_destroyed */ | |
1233 | 0, /* todo_flags_start */ | |
20099e35 | 1234 | 0 /* todo_flags_finish */ |
cb886925 | 1235 | }, |
f8b7e3ec | 1236 | NULL, /* generate_summary */ |
1237 | NULL, /* write_summary */ | |
1238 | NULL, /* read_summary */ | |
d97be713 | 1239 | ipa_reference_write_optimization_summary,/* write_optimization_summary */ |
1240 | ipa_reference_read_optimization_summary,/* read_optimization_summary */ | |
90464c8b | 1241 | NULL, /* stmt_fixup */ |
cb886925 | 1242 | 0, /* TODOs */ |
1243 | NULL, /* function_transform */ | |
1244 | NULL /* variable_transform */ | |
f7d118a9 | 1245 | }; |