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a418679d | 1 | /* Callgraph based interprocedural optimizations. |
66647d44 | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
cac67c08 | 3 | Free Software Foundation, Inc. |
1c4a429a JH |
4 | Contributed by Jan Hubicka |
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 |
1c4a429a JH |
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/>. */ | |
1c4a429a | 21 | |
18c6ada9 | 22 | /* This module implements main driver of compilation process as well as |
a418679d | 23 | few basic interprocedural optimizers. |
18c6ada9 JH |
24 | |
25 | The main scope of this file is to act as an interface in between | |
26 | tree based frontends and the backend (and middle end) | |
27 | ||
28 | The front-end is supposed to use following functionality: | |
29 | ||
30 | - cgraph_finalize_function | |
31 | ||
32 | This function is called once front-end has parsed whole body of function | |
33 | and it is certain that the function body nor the declaration will change. | |
34 | ||
efe75b6f JH |
35 | (There is one exception needed for implementing GCC extern inline |
36 | function.) | |
18c6ada9 | 37 | |
8a4a83ed | 38 | - varpool_finalize_variable |
18c6ada9 | 39 | |
1ae58c30 | 40 | This function has same behavior as the above but is used for static |
18c6ada9 JH |
41 | variables. |
42 | ||
43 | - cgraph_finalize_compilation_unit | |
44 | ||
efe75b6f JH |
45 | This function is called once (source level) compilation unit is finalized |
46 | and it will no longer change. | |
18c6ada9 | 47 | |
7e8b322a | 48 | In the the call-graph construction and local function |
18c6ada9 JH |
49 | analysis takes place here. Bodies of unreachable functions are released |
50 | to conserve memory usage. | |
51 | ||
efe75b6f JH |
52 | The function can be called multiple times when multiple source level |
53 | compilation units are combined (such as in C frontend) | |
18c6ada9 JH |
54 | |
55 | - cgraph_optimize | |
56 | ||
57 | In this unit-at-a-time compilation the intra procedural analysis takes | |
58 | place here. In particular the static functions whose address is never | |
59 | taken are marked as local. Backend can then use this information to | |
60 | modify calling conventions, do better inlining or similar optimizations. | |
61 | ||
18c6ada9 | 62 | - cgraph_mark_needed_node |
8a4a83ed | 63 | - varpool_mark_needed_node |
18c6ada9 | 64 | |
efe75b6f JH |
65 | When function or variable is referenced by some hidden way the call-graph |
66 | data structure must be updated accordingly by this function. | |
67 | There should be little need to call this function and all the references | |
68 | should be made explicit to cgraph code. At present these functions are | |
dbb23ff7 | 69 | used by C++ frontend to explicitly mark the keyed methods. |
18c6ada9 JH |
70 | |
71 | - analyze_expr callback | |
72 | ||
73 | This function is responsible for lowering tree nodes not understood by | |
74 | generic code into understandable ones or alternatively marking | |
75 | callgraph and varpool nodes referenced by the as needed. | |
76 | ||
77 | ??? On the tree-ssa genericizing should take place here and we will avoid | |
78 | need for these hooks (replacing them by genericizing hook) | |
79 | ||
7e8b322a | 80 | Analyzing of all functions is deferred |
18c6ada9 JH |
81 | to cgraph_finalize_compilation_unit and expansion into cgraph_optimize. |
82 | ||
83 | In cgraph_finalize_compilation_unit the reachable functions are | |
84 | analyzed. During analysis the call-graph edges from reachable | |
85 | functions are constructed and their destinations are marked as | |
86 | reachable. References to functions and variables are discovered too | |
87 | and variables found to be needed output to the assembly file. Via | |
88 | mark_referenced call in assemble_variable functions referenced by | |
89 | static variables are noticed too. | |
90 | ||
e1990f69 | 91 | The intra-procedural information is produced and its existence |
18c6ada9 JH |
92 | indicated by global_info_ready. Once this flag is set it is impossible |
93 | to change function from !reachable to reachable and thus | |
94 | assemble_variable no longer call mark_referenced. | |
95 | ||
96 | Finally the call-graph is topologically sorted and all reachable functions | |
97 | that has not been completely inlined or are not external are output. | |
98 | ||
99 | ??? It is possible that reference to function or variable is optimized | |
100 | out. We can not deal with this nicely because topological order is not | |
101 | suitable for it. For tree-ssa we may consider another pass doing | |
102 | optimization and re-discovering reachable functions. | |
103 | ||
104 | ??? Reorganize code so variables are output very last and only if they | |
105 | really has been referenced by produced code, so we catch more cases | |
7e8b322a | 106 | where reference has been optimized out. */ |
9b3e897d | 107 | |
6674a6ce | 108 | |
1c4a429a JH |
109 | #include "config.h" |
110 | #include "system.h" | |
111 | #include "coretypes.h" | |
112 | #include "tm.h" | |
113 | #include "tree.h" | |
c9b9aa64 | 114 | #include "rtl.h" |
6674a6ce | 115 | #include "tree-flow.h" |
1c4a429a JH |
116 | #include "tree-inline.h" |
117 | #include "langhooks.h" | |
0c58f841 | 118 | #include "pointer-set.h" |
1c4a429a JH |
119 | #include "toplev.h" |
120 | #include "flags.h" | |
121 | #include "ggc.h" | |
122 | #include "debug.h" | |
123 | #include "target.h" | |
124 | #include "cgraph.h" | |
dafc5b82 | 125 | #include "diagnostic.h" |
a194aa56 | 126 | #include "timevar.h" |
b58b1157 JH |
127 | #include "params.h" |
128 | #include "fibheap.h" | |
dc0bfe6a | 129 | #include "intl.h" |
902edd36 | 130 | #include "function.h" |
57fb5341 | 131 | #include "ipa-prop.h" |
726a989a RB |
132 | #include "gimple.h" |
133 | #include "tree-iterator.h" | |
b4861090 | 134 | #include "tree-pass.h" |
a406865a | 135 | #include "tree-dump.h" |
cd9c7bd2 | 136 | #include "output.h" |
3baf459d | 137 | #include "coverage.h" |
b58b1157 | 138 | |
a20af5b8 | 139 | static void cgraph_expand_all_functions (void); |
db0e878d AJ |
140 | static void cgraph_mark_functions_to_output (void); |
141 | static void cgraph_expand_function (struct cgraph_node *); | |
21c4a6a7 | 142 | static void cgraph_output_pending_asms (void); |
a406865a RG |
143 | static void cgraph_optimize (void); |
144 | static void cgraph_analyze_function (struct cgraph_node *); | |
7dff32e6 | 145 | |
9b3e897d PB |
146 | static FILE *cgraph_dump_file; |
147 | ||
873c7164 MM |
148 | /* A vector of FUNCTION_DECLs declared as static constructors. */ |
149 | static GTY (()) VEC(tree, gc) *static_ctors; | |
150 | /* A vector of FUNCTION_DECLs declared as static destructors. */ | |
151 | static GTY (()) VEC(tree, gc) *static_dtors; | |
7be82279 JH |
152 | |
153 | /* When target does not have ctors and dtors, we call all constructor | |
c80b4100 | 154 | and destructor by special initialization/destruction function |
7be82279 JH |
155 | recognized by collect2. |
156 | ||
157 | When we are going to build this function, collect all constructors and | |
158 | destructors and turn them into normal functions. */ | |
159 | ||
160 | static void | |
161 | record_cdtor_fn (tree fndecl) | |
162 | { | |
bd85fcee JH |
163 | struct cgraph_node *node; |
164 | if (targetm.have_ctors_dtors | |
165 | || (!DECL_STATIC_CONSTRUCTOR (fndecl) | |
166 | && !DECL_STATIC_DESTRUCTOR (fndecl))) | |
7be82279 JH |
167 | return; |
168 | ||
169 | if (DECL_STATIC_CONSTRUCTOR (fndecl)) | |
170 | { | |
873c7164 | 171 | VEC_safe_push (tree, gc, static_ctors, fndecl); |
7be82279 | 172 | DECL_STATIC_CONSTRUCTOR (fndecl) = 0; |
7be82279 JH |
173 | } |
174 | if (DECL_STATIC_DESTRUCTOR (fndecl)) | |
175 | { | |
873c7164 | 176 | VEC_safe_push (tree, gc, static_dtors, fndecl); |
7be82279 | 177 | DECL_STATIC_DESTRUCTOR (fndecl) = 0; |
7be82279 | 178 | } |
bd85fcee JH |
179 | node = cgraph_node (fndecl); |
180 | node->local.disregard_inline_limits = 1; | |
181 | cgraph_mark_reachable_node (node); | |
7be82279 JH |
182 | } |
183 | ||
873c7164 MM |
184 | /* Define global constructors/destructor functions for the CDTORS, of |
185 | which they are LEN. The CDTORS are sorted by initialization | |
186 | priority. If CTOR_P is true, these are constructors; otherwise, | |
187 | they are destructors. */ | |
188 | ||
7be82279 | 189 | static void |
873c7164 | 190 | build_cdtor (bool ctor_p, tree *cdtors, size_t len) |
7be82279 | 191 | { |
873c7164 | 192 | size_t i; |
7be82279 | 193 | |
873c7164 MM |
194 | i = 0; |
195 | while (i < len) | |
196 | { | |
197 | tree body; | |
198 | tree fn; | |
199 | priority_type priority; | |
200 | ||
201 | priority = 0; | |
202 | body = NULL_TREE; | |
203 | /* Find the next batch of constructors/destructors with the same | |
204 | initialization priority. */ | |
205 | do | |
206 | { | |
207 | priority_type p; | |
208 | fn = cdtors[i]; | |
209 | p = ctor_p ? DECL_INIT_PRIORITY (fn) : DECL_FINI_PRIORITY (fn); | |
210 | if (!body) | |
211 | priority = p; | |
212 | else if (p != priority) | |
213 | break; | |
db3927fb AH |
214 | append_to_statement_list (build_function_call_expr (UNKNOWN_LOCATION, |
215 | fn, 0), | |
873c7164 MM |
216 | &body); |
217 | ++i; | |
218 | } | |
219 | while (i < len); | |
220 | gcc_assert (body != NULL_TREE); | |
221 | /* Generate a function to call all the function of like | |
222 | priority. */ | |
223 | cgraph_build_static_cdtor (ctor_p ? 'I' : 'D', body, priority); | |
224 | } | |
225 | } | |
226 | ||
227 | /* Comparison function for qsort. P1 and P2 are actually of type | |
228 | "tree *" and point to static constructors. DECL_INIT_PRIORITY is | |
229 | used to determine the sort order. */ | |
7be82279 | 230 | |
873c7164 MM |
231 | static int |
232 | compare_ctor (const void *p1, const void *p2) | |
233 | { | |
234 | tree f1; | |
235 | tree f2; | |
236 | int priority1; | |
237 | int priority2; | |
238 | ||
239 | f1 = *(const tree *)p1; | |
240 | f2 = *(const tree *)p2; | |
241 | priority1 = DECL_INIT_PRIORITY (f1); | |
242 | priority2 = DECL_INIT_PRIORITY (f2); | |
243 | ||
244 | if (priority1 < priority2) | |
245 | return -1; | |
246 | else if (priority1 > priority2) | |
247 | return 1; | |
248 | else | |
249 | /* Ensure a stable sort. */ | |
250 | return (const tree *)p1 - (const tree *)p2; | |
251 | } | |
252 | ||
253 | /* Comparison function for qsort. P1 and P2 are actually of type | |
254 | "tree *" and point to static destructors. DECL_FINI_PRIORITY is | |
255 | used to determine the sort order. */ | |
7be82279 | 256 | |
873c7164 MM |
257 | static int |
258 | compare_dtor (const void *p1, const void *p2) | |
259 | { | |
260 | tree f1; | |
261 | tree f2; | |
262 | int priority1; | |
263 | int priority2; | |
264 | ||
265 | f1 = *(const tree *)p1; | |
266 | f2 = *(const tree *)p2; | |
267 | priority1 = DECL_FINI_PRIORITY (f1); | |
268 | priority2 = DECL_FINI_PRIORITY (f2); | |
269 | ||
270 | if (priority1 < priority2) | |
271 | return -1; | |
272 | else if (priority1 > priority2) | |
273 | return 1; | |
274 | else | |
275 | /* Ensure a stable sort. */ | |
276 | return (const tree *)p1 - (const tree *)p2; | |
7be82279 JH |
277 | } |
278 | ||
279 | /* Generate functions to call static constructors and destructors | |
280 | for targets that do not support .ctors/.dtors sections. These | |
281 | functions have magic names which are detected by collect2. */ | |
282 | ||
283 | static void | |
284 | cgraph_build_cdtor_fns (void) | |
285 | { | |
873c7164 | 286 | if (!VEC_empty (tree, static_ctors)) |
7be82279 | 287 | { |
873c7164 MM |
288 | gcc_assert (!targetm.have_ctors_dtors); |
289 | qsort (VEC_address (tree, static_ctors), | |
290 | VEC_length (tree, static_ctors), | |
291 | sizeof (tree), | |
292 | compare_ctor); | |
293 | build_cdtor (/*ctor_p=*/true, | |
294 | VEC_address (tree, static_ctors), | |
295 | VEC_length (tree, static_ctors)); | |
296 | VEC_truncate (tree, static_ctors, 0); | |
7be82279 | 297 | } |
873c7164 MM |
298 | |
299 | if (!VEC_empty (tree, static_dtors)) | |
7be82279 | 300 | { |
873c7164 MM |
301 | gcc_assert (!targetm.have_ctors_dtors); |
302 | qsort (VEC_address (tree, static_dtors), | |
303 | VEC_length (tree, static_dtors), | |
304 | sizeof (tree), | |
305 | compare_dtor); | |
306 | build_cdtor (/*ctor_p=*/false, | |
307 | VEC_address (tree, static_dtors), | |
308 | VEC_length (tree, static_dtors)); | |
309 | VEC_truncate (tree, static_dtors, 0); | |
7be82279 JH |
310 | } |
311 | } | |
312 | ||
8dafba3c RH |
313 | /* Determine if function DECL is needed. That is, visible to something |
314 | either outside this translation unit, something magic in the system | |
7e8b322a | 315 | configury. */ |
8dafba3c RH |
316 | |
317 | static bool | |
318 | decide_is_function_needed (struct cgraph_node *node, tree decl) | |
319 | { | |
ce91e74c JH |
320 | if (MAIN_NAME_P (DECL_NAME (decl)) |
321 | && TREE_PUBLIC (decl)) | |
322 | { | |
323 | node->local.externally_visible = true; | |
324 | return true; | |
325 | } | |
6de9cd9a | 326 | |
e7d6beb0 | 327 | /* If the user told us it is used, then it must be so. */ |
386b46cf JH |
328 | if (node->local.externally_visible) |
329 | return true; | |
330 | ||
e7d6beb0 JH |
331 | /* ??? If the assembler name is set by hand, it is possible to assemble |
332 | the name later after finalizing the function and the fact is noticed | |
333 | in assemble_name then. This is arguably a bug. */ | |
334 | if (DECL_ASSEMBLER_NAME_SET_P (decl) | |
335 | && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) | |
336 | return true; | |
337 | ||
a1d31187 JH |
338 | /* With -fkeep-inline-functions we are keeping all inline functions except |
339 | for extern inline ones. */ | |
340 | if (flag_keep_inline_functions | |
341 | && DECL_DECLARED_INLINE_P (decl) | |
b521dcbe JH |
342 | && !DECL_EXTERNAL (decl) |
343 | && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl))) | |
a1d31187 JH |
344 | return true; |
345 | ||
8dafba3c RH |
346 | /* If we decided it was needed before, but at the time we didn't have |
347 | the body of the function available, then it's still needed. We have | |
348 | to go back and re-check its dependencies now. */ | |
349 | if (node->needed) | |
350 | return true; | |
351 | ||
352 | /* Externally visible functions must be output. The exception is | |
c22cacf3 | 353 | COMDAT functions that must be output only when they are needed. |
04f77d0f JH |
354 | |
355 | When not optimizing, also output the static functions. (see | |
46f5f7f2 | 356 | PR24561), but don't do so for always_inline functions, functions |
b633db7b JH |
357 | declared inline and nested functions. These was optimized out |
358 | in the original implementation and it is unclear whether we want | |
6fc0bb99 | 359 | to change the behavior here. */ |
5d342ef9 | 360 | if (((TREE_PUBLIC (decl) |
b633db7b JH |
361 | || (!optimize && !node->local.disregard_inline_limits |
362 | && !DECL_DECLARED_INLINE_P (decl) | |
363 | && !node->origin)) | |
5d342ef9 | 364 | && !flag_whole_program) |
ce91e74c | 365 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) |
8dafba3c RH |
366 | return true; |
367 | ||
368 | /* Constructors and destructors are reachable from the runtime by | |
369 | some mechanism. */ | |
370 | if (DECL_STATIC_CONSTRUCTOR (decl) || DECL_STATIC_DESTRUCTOR (decl)) | |
371 | return true; | |
372 | ||
8dafba3c RH |
373 | return false; |
374 | } | |
375 | ||
d60ab196 | 376 | /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these |
f45e0ad1 JH |
377 | functions into callgraph in a way so they look like ordinary reachable |
378 | functions inserted into callgraph already at construction time. */ | |
379 | ||
380 | bool | |
381 | cgraph_process_new_functions (void) | |
382 | { | |
383 | bool output = false; | |
384 | tree fndecl; | |
385 | struct cgraph_node *node; | |
386 | ||
387 | /* Note that this queue may grow as its being processed, as the new | |
388 | functions may generate new ones. */ | |
389 | while (cgraph_new_nodes) | |
390 | { | |
391 | node = cgraph_new_nodes; | |
392 | fndecl = node->decl; | |
393 | cgraph_new_nodes = cgraph_new_nodes->next_needed; | |
394 | switch (cgraph_state) | |
395 | { | |
396 | case CGRAPH_STATE_CONSTRUCTION: | |
397 | /* At construction time we just need to finalize function and move | |
398 | it into reachable functions list. */ | |
399 | ||
400 | node->next_needed = NULL; | |
401 | cgraph_finalize_function (fndecl, false); | |
402 | cgraph_mark_reachable_node (node); | |
403 | output = true; | |
404 | break; | |
405 | ||
406 | case CGRAPH_STATE_IPA: | |
7a388ee4 | 407 | case CGRAPH_STATE_IPA_SSA: |
f45e0ad1 JH |
408 | /* When IPA optimization already started, do all essential |
409 | transformations that has been already performed on the whole | |
410 | cgraph but not on this function. */ | |
411 | ||
726a989a | 412 | gimple_register_cfg_hooks (); |
f45e0ad1 JH |
413 | if (!node->analyzed) |
414 | cgraph_analyze_function (node); | |
415 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
416 | current_function_decl = fndecl; | |
1920df6c | 417 | compute_inline_parameters (node); |
7a388ee4 JH |
418 | if ((cgraph_state == CGRAPH_STATE_IPA_SSA |
419 | && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
420 | /* When not optimizing, be sure we run early local passes anyway | |
421 | to expand OMP. */ | |
422 | || !optimize) | |
8ddbbcae | 423 | execute_pass_list (pass_early_local_passes.pass.sub); |
f45e0ad1 JH |
424 | free_dominance_info (CDI_POST_DOMINATORS); |
425 | free_dominance_info (CDI_DOMINATORS); | |
426 | pop_cfun (); | |
427 | current_function_decl = NULL; | |
428 | break; | |
429 | ||
430 | case CGRAPH_STATE_EXPANSION: | |
431 | /* Functions created during expansion shall be compiled | |
432 | directly. */ | |
257eb6e3 | 433 | node->process = 0; |
f45e0ad1 JH |
434 | cgraph_expand_function (node); |
435 | break; | |
436 | ||
437 | default: | |
438 | gcc_unreachable (); | |
439 | break; | |
440 | } | |
129a37fc | 441 | cgraph_call_function_insertion_hooks (node); |
f45e0ad1 JH |
442 | } |
443 | return output; | |
444 | } | |
445 | ||
d71cc23f JH |
446 | /* As an GCC extension we allow redefinition of the function. The |
447 | semantics when both copies of bodies differ is not well defined. | |
448 | We replace the old body with new body so in unit at a time mode | |
449 | we always use new body, while in normal mode we may end up with | |
450 | old body inlined into some functions and new body expanded and | |
451 | inlined in others. | |
452 | ||
453 | ??? It may make more sense to use one body for inlining and other | |
454 | body for expanding the function but this is difficult to do. */ | |
455 | ||
456 | static void | |
457 | cgraph_reset_node (struct cgraph_node *node) | |
458 | { | |
257eb6e3 | 459 | /* If node->process is set, then we have already begun whole-unit analysis. |
7e8b322a JH |
460 | This is *not* testing for whether we've already emitted the function. |
461 | That case can be sort-of legitimately seen with real function redefinition | |
462 | errors. I would argue that the front end should never present us with | |
463 | such a case, but don't enforce that for now. */ | |
257eb6e3 | 464 | gcc_assert (!node->process); |
d71cc23f JH |
465 | |
466 | /* Reset our data structures so we can analyze the function again. */ | |
467 | memset (&node->local, 0, sizeof (node->local)); | |
468 | memset (&node->global, 0, sizeof (node->global)); | |
469 | memset (&node->rtl, 0, sizeof (node->rtl)); | |
470 | node->analyzed = false; | |
471 | node->local.redefined_extern_inline = true; | |
472 | node->local.finalized = false; | |
473 | ||
d71cc23f JH |
474 | cgraph_node_remove_callees (node); |
475 | ||
476 | /* We may need to re-queue the node for assembling in case | |
b86b3ea3 RG |
477 | we already proceeded it and ignored as not needed or got |
478 | a re-declaration in IMA mode. */ | |
479 | if (node->reachable) | |
d71cc23f JH |
480 | { |
481 | struct cgraph_node *n; | |
482 | ||
483 | for (n = cgraph_nodes_queue; n; n = n->next_needed) | |
484 | if (n == node) | |
485 | break; | |
486 | if (!n) | |
487 | node->reachable = 0; | |
488 | } | |
489 | } | |
d853a20e | 490 | |
953ff289 DN |
491 | static void |
492 | cgraph_lower_function (struct cgraph_node *node) | |
493 | { | |
494 | if (node->lowered) | |
495 | return; | |
a406865a RG |
496 | |
497 | if (node->nested) | |
498 | lower_nested_functions (node->decl); | |
499 | gcc_assert (!node->nested); | |
500 | ||
953ff289 DN |
501 | tree_lowering_passes (node->decl); |
502 | node->lowered = true; | |
503 | } | |
504 | ||
6b00c969 RH |
505 | /* DECL has been parsed. Take it, queue it, compile it at the whim of the |
506 | logic in effect. If NESTED is true, then our caller cannot stand to have | |
507 | the garbage collector run at the moment. We would need to either create | |
508 | a new GC context, or just not compile right now. */ | |
1c4a429a JH |
509 | |
510 | void | |
6b00c969 | 511 | cgraph_finalize_function (tree decl, bool nested) |
1c4a429a JH |
512 | { |
513 | struct cgraph_node *node = cgraph_node (decl); | |
514 | ||
d853a20e | 515 | if (node->local.finalized) |
d71cc23f | 516 | cgraph_reset_node (node); |
6b00c969 | 517 | |
6bad2617 | 518 | node->pid = cgraph_max_pid ++; |
d853a20e | 519 | notice_global_symbol (decl); |
f6981e16 | 520 | node->local.finalized = true; |
e21aff8a | 521 | node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL; |
d88e5c37 | 522 | node->finalized_by_frontend = true; |
7be82279 | 523 | record_cdtor_fn (node->decl); |
1c4a429a | 524 | |
8dafba3c RH |
525 | if (decide_is_function_needed (node, decl)) |
526 | cgraph_mark_needed_node (node); | |
527 | ||
ff5c4582 | 528 | /* Since we reclaim unreachable nodes at the end of every language |
e7d6beb0 JH |
529 | level unit, we need to be conservative about possible entry points |
530 | there. */ | |
ce91e74c | 531 | if ((TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))) |
e7d6beb0 JH |
532 | cgraph_mark_reachable_node (node); |
533 | ||
8dafba3c | 534 | /* If we've not yet emitted decl, tell the debug info about it. */ |
6b00c969 | 535 | if (!TREE_ASM_WRITTEN (decl)) |
8dafba3c | 536 | (*debug_hooks->deferred_inline_function) (decl); |
d173e685 | 537 | |
902edd36 JH |
538 | /* Possibly warn about unused parameters. */ |
539 | if (warn_unused_parameter) | |
540 | do_warn_unused_parameter (decl); | |
7e8b322a JH |
541 | |
542 | if (!nested) | |
543 | ggc_collect (); | |
1c4a429a JH |
544 | } |
545 | ||
f0c882ab JH |
546 | /* C99 extern inline keywords allow changing of declaration after function |
547 | has been finalized. We need to re-decide if we want to mark the function as | |
548 | needed then. */ | |
549 | ||
550 | void | |
551 | cgraph_mark_if_needed (tree decl) | |
552 | { | |
553 | struct cgraph_node *node = cgraph_node (decl); | |
554 | if (node->local.finalized && decide_is_function_needed (node, decl)) | |
555 | cgraph_mark_needed_node (node); | |
556 | } | |
557 | ||
9187e02d JH |
558 | /* Return TRUE if NODE2 is equivalent to NODE or its clone. */ |
559 | static bool | |
560 | clone_of_p (struct cgraph_node *node, struct cgraph_node *node2) | |
561 | { | |
562 | while (node != node2 && node2) | |
563 | node2 = node2->clone_of; | |
564 | return node2 != NULL; | |
565 | } | |
566 | ||
18c6ada9 JH |
567 | /* Verify cgraph nodes of given cgraph node. */ |
568 | void | |
569 | verify_cgraph_node (struct cgraph_node *node) | |
570 | { | |
571 | struct cgraph_edge *e; | |
e21aff8a | 572 | struct function *this_cfun = DECL_STRUCT_FUNCTION (node->decl); |
2bafad93 | 573 | struct function *saved_cfun = cfun; |
e21aff8a | 574 | basic_block this_block; |
726a989a | 575 | gimple_stmt_iterator gsi; |
e0704a46 | 576 | bool error_found = false; |
18c6ada9 | 577 | |
5771bd91 RG |
578 | if (errorcount || sorrycount) |
579 | return; | |
580 | ||
18c6ada9 | 581 | timevar_push (TV_CGRAPH_VERIFY); |
2bafad93 JJ |
582 | /* debug_generic_stmt needs correct cfun */ |
583 | set_cfun (this_cfun); | |
18c6ada9 JH |
584 | for (e = node->callees; e; e = e->next_callee) |
585 | if (e->aux) | |
586 | { | |
ab532386 | 587 | error ("aux field set for edge %s->%s", |
4f1e4960 JM |
588 | identifier_to_locale (cgraph_node_name (e->caller)), |
589 | identifier_to_locale (cgraph_node_name (e->callee))); | |
18c6ada9 JH |
590 | error_found = true; |
591 | } | |
06191a23 JH |
592 | if (node->count < 0) |
593 | { | |
594 | error ("Execution count is negative"); | |
595 | error_found = true; | |
596 | } | |
18c6ada9 JH |
597 | for (e = node->callers; e; e = e->next_caller) |
598 | { | |
06191a23 JH |
599 | if (e->count < 0) |
600 | { | |
601 | error ("caller edge count is negative"); | |
602 | error_found = true; | |
603 | } | |
45a80bb9 JH |
604 | if (e->frequency < 0) |
605 | { | |
606 | error ("caller edge frequency is negative"); | |
607 | error_found = true; | |
608 | } | |
609 | if (e->frequency > CGRAPH_FREQ_MAX) | |
610 | { | |
611 | error ("caller edge frequency is too large"); | |
612 | error_found = true; | |
613 | } | |
18c6ada9 JH |
614 | if (!e->inline_failed) |
615 | { | |
616 | if (node->global.inlined_to | |
617 | != (e->caller->global.inlined_to | |
618 | ? e->caller->global.inlined_to : e->caller)) | |
619 | { | |
ab532386 | 620 | error ("inlined_to pointer is wrong"); |
18c6ada9 JH |
621 | error_found = true; |
622 | } | |
623 | if (node->callers->next_caller) | |
624 | { | |
ab532386 | 625 | error ("multiple inline callers"); |
18c6ada9 JH |
626 | error_found = true; |
627 | } | |
628 | } | |
629 | else | |
630 | if (node->global.inlined_to) | |
631 | { | |
ab532386 | 632 | error ("inlined_to pointer set for noninline callers"); |
18c6ada9 JH |
633 | error_found = true; |
634 | } | |
635 | } | |
636 | if (!node->callers && node->global.inlined_to) | |
637 | { | |
95a52ebb | 638 | error ("inlined_to pointer is set but no predecessors found"); |
18c6ada9 JH |
639 | error_found = true; |
640 | } | |
641 | if (node->global.inlined_to == node) | |
642 | { | |
ab532386 | 643 | error ("inlined_to pointer refers to itself"); |
18c6ada9 JH |
644 | error_found = true; |
645 | } | |
646 | ||
69fb1284 | 647 | if (!cgraph_node (node->decl)) |
18c6ada9 | 648 | { |
69fb1284 | 649 | error ("node not found in cgraph_hash"); |
18c6ada9 JH |
650 | error_found = true; |
651 | } | |
c22cacf3 | 652 | |
9187e02d JH |
653 | if (node->clone_of) |
654 | { | |
655 | struct cgraph_node *n; | |
656 | for (n = node->clone_of->clones; n; n = n->next_sibling_clone) | |
657 | if (n == node) | |
658 | break; | |
659 | if (!n) | |
660 | { | |
661 | error ("node has wrong clone_of"); | |
662 | error_found = true; | |
663 | } | |
664 | } | |
665 | if (node->clones) | |
666 | { | |
667 | struct cgraph_node *n; | |
668 | for (n = node->clones; n; n = n->next_sibling_clone) | |
669 | if (n->clone_of != node) | |
670 | break; | |
671 | if (n) | |
672 | { | |
673 | error ("node has wrong clone list"); | |
674 | error_found = true; | |
675 | } | |
676 | } | |
677 | if ((node->prev_sibling_clone || node->next_sibling_clone) && !node->clone_of) | |
678 | { | |
679 | error ("node is in clone list but it is not clone"); | |
680 | error_found = true; | |
681 | } | |
682 | if (!node->prev_sibling_clone && node->clone_of && node->clone_of->clones != node) | |
683 | { | |
684 | error ("node has wrong prev_clone pointer"); | |
685 | error_found = true; | |
686 | } | |
687 | if (node->prev_sibling_clone && node->prev_sibling_clone->next_sibling_clone != node) | |
688 | { | |
689 | error ("double linked list of clones corrupted"); | |
690 | error_found = true; | |
691 | } | |
692 | ||
693 | if (node->analyzed && gimple_has_body_p (node->decl) | |
726a989a | 694 | && !TREE_ASM_WRITTEN (node->decl) |
18c6ada9 JH |
695 | && (!DECL_EXTERNAL (node->decl) || node->global.inlined_to)) |
696 | { | |
e21aff8a SB |
697 | if (this_cfun->cfg) |
698 | { | |
699 | /* The nodes we're interested in are never shared, so walk | |
700 | the tree ignoring duplicates. */ | |
2dee695b | 701 | struct pointer_set_t *visited_nodes = pointer_set_create (); |
e21aff8a SB |
702 | /* Reach the trees by walking over the CFG, and note the |
703 | enclosing basic-blocks in the call edges. */ | |
704 | FOR_EACH_BB_FN (this_block, this_cfun) | |
726a989a RB |
705 | for (gsi = gsi_start_bb (this_block); |
706 | !gsi_end_p (gsi); | |
707 | gsi_next (&gsi)) | |
e0704a46 | 708 | { |
726a989a | 709 | gimple stmt = gsi_stmt (gsi); |
e0704a46 | 710 | tree decl; |
726a989a | 711 | if (is_gimple_call (stmt) && (decl = gimple_call_fndecl (stmt))) |
e0704a46 JH |
712 | { |
713 | struct cgraph_edge *e = cgraph_edge (node, stmt); | |
714 | if (e) | |
715 | { | |
716 | if (e->aux) | |
717 | { | |
ab532386 | 718 | error ("shared call_stmt:"); |
726a989a | 719 | debug_gimple_stmt (stmt); |
e0704a46 JH |
720 | error_found = true; |
721 | } | |
9187e02d JH |
722 | if (!clone_of_p (cgraph_node (decl), e->callee) |
723 | && !e->callee->global.inlined_to) | |
e0704a46 | 724 | { |
ab532386 | 725 | error ("edge points to wrong declaration:"); |
e0704a46 JH |
726 | debug_tree (e->callee->decl); |
727 | fprintf (stderr," Instead of:"); | |
728 | debug_tree (decl); | |
729 | } | |
730 | e->aux = (void *)1; | |
731 | } | |
732 | else | |
733 | { | |
ab532386 | 734 | error ("missing callgraph edge for call stmt:"); |
726a989a | 735 | debug_gimple_stmt (stmt); |
e0704a46 JH |
736 | error_found = true; |
737 | } | |
738 | } | |
739 | } | |
e21aff8a | 740 | pointer_set_destroy (visited_nodes); |
e21aff8a SB |
741 | } |
742 | else | |
743 | /* No CFG available?! */ | |
744 | gcc_unreachable (); | |
745 | ||
18c6ada9 JH |
746 | for (e = node->callees; e; e = e->next_callee) |
747 | { | |
3e293154 | 748 | if (!e->aux && !e->indirect_call) |
18c6ada9 | 749 | { |
ab532386 | 750 | error ("edge %s->%s has no corresponding call_stmt", |
4f1e4960 JM |
751 | identifier_to_locale (cgraph_node_name (e->caller)), |
752 | identifier_to_locale (cgraph_node_name (e->callee))); | |
726a989a | 753 | debug_gimple_stmt (e->call_stmt); |
18c6ada9 JH |
754 | error_found = true; |
755 | } | |
756 | e->aux = 0; | |
757 | } | |
758 | } | |
759 | if (error_found) | |
760 | { | |
761 | dump_cgraph_node (stderr, node); | |
ab532386 | 762 | internal_error ("verify_cgraph_node failed"); |
18c6ada9 | 763 | } |
2bafad93 | 764 | set_cfun (saved_cfun); |
18c6ada9 JH |
765 | timevar_pop (TV_CGRAPH_VERIFY); |
766 | } | |
767 | ||
768 | /* Verify whole cgraph structure. */ | |
769 | void | |
770 | verify_cgraph (void) | |
771 | { | |
772 | struct cgraph_node *node; | |
773 | ||
89480522 JH |
774 | if (sorrycount || errorcount) |
775 | return; | |
776 | ||
18c6ada9 JH |
777 | for (node = cgraph_nodes; node; node = node->next) |
778 | verify_cgraph_node (node); | |
779 | } | |
780 | ||
474eccc6 ILT |
781 | /* Output all asm statements we have stored up to be output. */ |
782 | ||
783 | static void | |
784 | cgraph_output_pending_asms (void) | |
785 | { | |
786 | struct cgraph_asm_node *can; | |
787 | ||
788 | if (errorcount || sorrycount) | |
789 | return; | |
790 | ||
791 | for (can = cgraph_asm_nodes; can; can = can->next) | |
792 | assemble_asm (can->asm_str); | |
793 | cgraph_asm_nodes = NULL; | |
794 | } | |
795 | ||
e767b5be | 796 | /* Analyze the function scheduled to be output. */ |
a406865a | 797 | static void |
e767b5be JH |
798 | cgraph_analyze_function (struct cgraph_node *node) |
799 | { | |
a406865a | 800 | tree save = current_function_decl; |
e767b5be JH |
801 | tree decl = node->decl; |
802 | ||
25c84396 | 803 | current_function_decl = decl; |
e21aff8a | 804 | push_cfun (DECL_STRUCT_FUNCTION (decl)); |
a406865a RG |
805 | |
806 | /* Make sure to gimplify bodies only once. During analyzing a | |
807 | function we lower it, which will require gimplified nested | |
808 | functions, so we can end up here with an already gimplified | |
809 | body. */ | |
810 | if (!gimple_body (decl)) | |
811 | gimplify_function_tree (decl); | |
812 | dump_function (TDI_generic, decl); | |
813 | ||
e21aff8a | 814 | cgraph_lower_function (node); |
6a84c098 | 815 | node->analyzed = true; |
e767b5be | 816 | |
e21aff8a | 817 | pop_cfun (); |
a406865a | 818 | current_function_decl = save; |
e767b5be JH |
819 | } |
820 | ||
386b46cf JH |
821 | /* Look for externally_visible and used attributes and mark cgraph nodes |
822 | accordingly. | |
823 | ||
824 | We cannot mark the nodes at the point the attributes are processed (in | |
825 | handle_*_attribute) because the copy of the declarations available at that | |
826 | point may not be canonical. For example, in: | |
827 | ||
828 | void f(); | |
829 | void f() __attribute__((used)); | |
830 | ||
831 | the declaration we see in handle_used_attribute will be the second | |
832 | declaration -- but the front end will subsequently merge that declaration | |
833 | with the original declaration and discard the second declaration. | |
834 | ||
835 | Furthermore, we can't mark these nodes in cgraph_finalize_function because: | |
836 | ||
837 | void f() {} | |
838 | void f() __attribute__((externally_visible)); | |
839 | ||
840 | is valid. | |
841 | ||
842 | So, we walk the nodes at the end of the translation unit, applying the | |
843 | attributes at that point. */ | |
844 | ||
845 | static void | |
846 | process_function_and_variable_attributes (struct cgraph_node *first, | |
8a4a83ed | 847 | struct varpool_node *first_var) |
386b46cf JH |
848 | { |
849 | struct cgraph_node *node; | |
8a4a83ed | 850 | struct varpool_node *vnode; |
386b46cf JH |
851 | |
852 | for (node = cgraph_nodes; node != first; node = node->next) | |
853 | { | |
854 | tree decl = node->decl; | |
855 | if (lookup_attribute ("used", DECL_ATTRIBUTES (decl))) | |
856 | { | |
857 | mark_decl_referenced (decl); | |
858 | if (node->local.finalized) | |
859 | cgraph_mark_needed_node (node); | |
860 | } | |
861 | if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) | |
862 | { | |
343d4b27 | 863 | if (! TREE_PUBLIC (node->decl)) |
c5d75364 MLI |
864 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, |
865 | "%<externally_visible%>" | |
866 | " attribute have effect only on public objects"); | |
343d4b27 JJ |
867 | else |
868 | { | |
869 | if (node->local.finalized) | |
870 | cgraph_mark_needed_node (node); | |
871 | node->local.externally_visible = true; | |
872 | } | |
386b46cf JH |
873 | } |
874 | } | |
8a4a83ed | 875 | for (vnode = varpool_nodes; vnode != first_var; vnode = vnode->next) |
386b46cf JH |
876 | { |
877 | tree decl = vnode->decl; | |
878 | if (lookup_attribute ("used", DECL_ATTRIBUTES (decl))) | |
879 | { | |
880 | mark_decl_referenced (decl); | |
881 | if (vnode->finalized) | |
8a4a83ed | 882 | varpool_mark_needed_node (vnode); |
386b46cf JH |
883 | } |
884 | if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) | |
885 | { | |
343d4b27 | 886 | if (! TREE_PUBLIC (vnode->decl)) |
c5d75364 MLI |
887 | warning_at (DECL_SOURCE_LOCATION (vnode->decl), OPT_Wattributes, |
888 | "%<externally_visible%>" | |
889 | " attribute have effect only on public objects"); | |
343d4b27 JJ |
890 | else |
891 | { | |
892 | if (vnode->finalized) | |
8a4a83ed | 893 | varpool_mark_needed_node (vnode); |
343d4b27 JJ |
894 | vnode->externally_visible = true; |
895 | } | |
386b46cf JH |
896 | } |
897 | } | |
898 | } | |
899 | ||
151e6f24 JH |
900 | /* Process CGRAPH_NODES_NEEDED queue, analyze each function (and transitively |
901 | each reachable functions) and build cgraph. | |
902 | The function can be called multiple times after inserting new nodes | |
88512ba0 | 903 | into beginning of queue. Just the new part of queue is re-scanned then. */ |
1c4a429a | 904 | |
151e6f24 JH |
905 | static void |
906 | cgraph_analyze_functions (void) | |
1c4a429a | 907 | { |
cd9c7bd2 | 908 | /* Keep track of already processed nodes when called multiple times for |
aabcd309 | 909 | intermodule optimization. */ |
cd9c7bd2 | 910 | static struct cgraph_node *first_analyzed; |
61e00a5e | 911 | struct cgraph_node *first_processed = first_analyzed; |
8a4a83ed | 912 | static struct varpool_node *first_analyzed_var; |
151e6f24 | 913 | struct cgraph_node *node, *next; |
1c4a429a | 914 | |
61e00a5e JH |
915 | process_function_and_variable_attributes (first_processed, |
916 | first_analyzed_var); | |
917 | first_processed = cgraph_nodes; | |
8a4a83ed JH |
918 | first_analyzed_var = varpool_nodes; |
919 | varpool_analyze_pending_decls (); | |
a194aa56 | 920 | if (cgraph_dump_file) |
1c4a429a | 921 | { |
7d82fe7c | 922 | fprintf (cgraph_dump_file, "Initial entry points:"); |
cd9c7bd2 | 923 | for (node = cgraph_nodes; node != first_analyzed; node = node->next) |
39ecc018 | 924 | if (node->needed) |
a194aa56 JH |
925 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); |
926 | fprintf (cgraph_dump_file, "\n"); | |
1c4a429a | 927 | } |
151e6f24 | 928 | cgraph_process_new_functions (); |
1c4a429a | 929 | |
7660e67e SB |
930 | /* Propagate reachability flag and lower representation of all reachable |
931 | functions. In the future, lowering will introduce new functions and | |
932 | new entry points on the way (by template instantiation and virtual | |
933 | method table generation for instance). */ | |
1668aabc | 934 | while (cgraph_nodes_queue) |
1c4a429a | 935 | { |
e767b5be | 936 | struct cgraph_edge *edge; |
1668aabc JH |
937 | tree decl = cgraph_nodes_queue->decl; |
938 | ||
939 | node = cgraph_nodes_queue; | |
8bd87c4e | 940 | cgraph_nodes_queue = cgraph_nodes_queue->next_needed; |
18c6ada9 | 941 | node->next_needed = NULL; |
1c4a429a | 942 | |
cd4dea62 | 943 | /* ??? It is possible to create extern inline function and later using |
9d203871 | 944 | weak alias attribute to kill its body. See |
cd4dea62 | 945 | gcc.c-torture/compile/20011119-1.c */ |
726a989a | 946 | if (!DECL_STRUCT_FUNCTION (decl)) |
d71cc23f JH |
947 | { |
948 | cgraph_reset_node (node); | |
949 | continue; | |
950 | } | |
cd4dea62 | 951 | |
341c100f | 952 | gcc_assert (!node->analyzed && node->reachable); |
e767b5be | 953 | cgraph_analyze_function (node); |
8dafba3c | 954 | |
1c4a429a | 955 | for (edge = node->callees; edge; edge = edge->next_callee) |
e767b5be | 956 | if (!edge->callee->reachable) |
8dafba3c RH |
957 | cgraph_mark_reachable_node (edge->callee); |
958 | ||
6b20f353 DS |
959 | /* If decl is a clone of an abstract function, mark that abstract |
960 | function so that we don't release its body. The DECL_INITIAL() of that | |
961 | abstract function declaration will be later needed to output debug info. */ | |
962 | if (DECL_ABSTRACT_ORIGIN (decl)) | |
963 | { | |
964 | struct cgraph_node *origin_node = cgraph_node (DECL_ABSTRACT_ORIGIN (decl)); | |
965 | origin_node->abstract_and_needed = true; | |
966 | } | |
967 | ||
61e00a5e JH |
968 | /* We finalize local static variables during constructing callgraph |
969 | edges. Process their attributes too. */ | |
970 | process_function_and_variable_attributes (first_processed, | |
971 | first_analyzed_var); | |
972 | first_processed = cgraph_nodes; | |
8a4a83ed JH |
973 | first_analyzed_var = varpool_nodes; |
974 | varpool_analyze_pending_decls (); | |
151e6f24 | 975 | cgraph_process_new_functions (); |
1c4a429a | 976 | } |
8dafba3c | 977 | |
564738df | 978 | /* Collect entry points to the unit. */ |
a194aa56 | 979 | if (cgraph_dump_file) |
1668aabc | 980 | { |
7d82fe7c | 981 | fprintf (cgraph_dump_file, "Unit entry points:"); |
cd9c7bd2 | 982 | for (node = cgraph_nodes; node != first_analyzed; node = node->next) |
39ecc018 | 983 | if (node->needed) |
a194aa56 | 984 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); |
7d82fe7c | 985 | fprintf (cgraph_dump_file, "\n\nInitial "); |
e767b5be | 986 | dump_cgraph (cgraph_dump_file); |
1668aabc | 987 | } |
7660e67e | 988 | |
a194aa56 JH |
989 | if (cgraph_dump_file) |
990 | fprintf (cgraph_dump_file, "\nReclaiming functions:"); | |
1c4a429a | 991 | |
96fc428c | 992 | for (node = cgraph_nodes; node != first_analyzed; node = next) |
1c4a429a JH |
993 | { |
994 | tree decl = node->decl; | |
96fc428c | 995 | next = node->next; |
1c4a429a | 996 | |
39ecc018 | 997 | if (node->local.finalized && !gimple_has_body_p (decl)) |
c22cacf3 | 998 | cgraph_reset_node (node); |
d71cc23f | 999 | |
39ecc018 | 1000 | if (!node->reachable && gimple_has_body_p (decl)) |
1c4a429a | 1001 | { |
a194aa56 JH |
1002 | if (cgraph_dump_file) |
1003 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); | |
18c6ada9 | 1004 | cgraph_remove_node (node); |
d71cc23f | 1005 | continue; |
1c4a429a | 1006 | } |
9b0436b7 JH |
1007 | else |
1008 | node->next_needed = NULL; | |
39ecc018 | 1009 | gcc_assert (!node->local.finalized || gimple_has_body_p (decl)); |
d71cc23f | 1010 | gcc_assert (node->analyzed == node->local.finalized); |
1c4a429a | 1011 | } |
a194aa56 | 1012 | if (cgraph_dump_file) |
7d82fe7c KC |
1013 | { |
1014 | fprintf (cgraph_dump_file, "\n\nReclaimed "); | |
1015 | dump_cgraph (cgraph_dump_file); | |
1016 | } | |
cd9c7bd2 | 1017 | first_analyzed = cgraph_nodes; |
1c4a429a | 1018 | ggc_collect (); |
151e6f24 JH |
1019 | } |
1020 | ||
5f1a9ebb RG |
1021 | |
1022 | /* Emit thunks for every node in the cgraph. | |
1023 | FIXME: We really ought to emit thunks only for functions that are needed. */ | |
1024 | ||
1025 | static void | |
1026 | cgraph_emit_thunks (void) | |
1027 | { | |
1028 | struct cgraph_node *n; | |
1029 | ||
1030 | for (n = cgraph_nodes; n; n = n->next) | |
1031 | { | |
1032 | /* Only emit thunks on functions defined in this TU. | |
1033 | Note that this may emit more thunks than strictly necessary. | |
1034 | During optimization some nodes may disappear. It would be | |
1035 | nice to only emit thunks only for the functions that will be | |
1036 | emitted, but we cannot know that until the inliner and other | |
1037 | IPA passes have run (see the sequencing of the call to | |
1038 | cgraph_mark_functions_to_output in cgraph_optimize). */ | |
90097c67 RG |
1039 | if (n->reachable |
1040 | && !DECL_EXTERNAL (n->decl)) | |
5f1a9ebb RG |
1041 | lang_hooks.callgraph.emit_associated_thunks (n->decl); |
1042 | } | |
1043 | } | |
1044 | ||
1045 | ||
151e6f24 JH |
1046 | /* Analyze the whole compilation unit once it is parsed completely. */ |
1047 | ||
1048 | void | |
1049 | cgraph_finalize_compilation_unit (void) | |
1050 | { | |
90097c67 RG |
1051 | timevar_push (TV_CGRAPH); |
1052 | ||
a406865a RG |
1053 | /* Do not skip analyzing the functions if there were errors, we |
1054 | miss diagnostics for following functions otherwise. */ | |
151e6f24 | 1055 | |
5f1a9ebb | 1056 | /* Emit size functions we didn't inline. */ |
f82a627c | 1057 | finalize_size_functions (); |
5f1a9ebb | 1058 | |
5f1a9ebb RG |
1059 | /* Call functions declared with the "constructor" or "destructor" |
1060 | attribute. */ | |
1061 | cgraph_build_cdtor_fns (); | |
151e6f24 | 1062 | |
90097c67 RG |
1063 | /* Mark alias targets necessary and emit diagnostics. */ |
1064 | finish_aliases_1 (); | |
1065 | ||
151e6f24 JH |
1066 | if (!quiet_flag) |
1067 | { | |
1068 | fprintf (stderr, "\nAnalyzing compilation unit\n"); | |
1069 | fflush (stderr); | |
1070 | } | |
1071 | ||
90097c67 RG |
1072 | /* Gimplify and lower all functions, compute reachability and |
1073 | remove unreachable nodes. */ | |
1074 | cgraph_analyze_functions (); | |
1075 | ||
1076 | /* Emit thunks for reachable nodes, if needed. */ | |
1077 | if (lang_hooks.callgraph.emit_associated_thunks) | |
1078 | cgraph_emit_thunks (); | |
1079 | ||
5f1a9ebb RG |
1080 | /* Mark alias targets necessary and emit diagnostics. */ |
1081 | finish_aliases_1 (); | |
1082 | ||
90097c67 | 1083 | /* Gimplify and lower thunks. */ |
151e6f24 | 1084 | cgraph_analyze_functions (); |
a406865a | 1085 | |
90097c67 | 1086 | /* Finally drive the pass manager. */ |
a406865a | 1087 | cgraph_optimize (); |
90097c67 RG |
1088 | |
1089 | timevar_pop (TV_CGRAPH); | |
1c4a429a | 1090 | } |
3baf459d DN |
1091 | |
1092 | ||
1c4a429a JH |
1093 | /* Figure out what functions we want to assemble. */ |
1094 | ||
1095 | static void | |
db0e878d | 1096 | cgraph_mark_functions_to_output (void) |
1c4a429a JH |
1097 | { |
1098 | struct cgraph_node *node; | |
1099 | ||
1c4a429a JH |
1100 | for (node = cgraph_nodes; node; node = node->next) |
1101 | { | |
1102 | tree decl = node->decl; | |
b58b1157 | 1103 | struct cgraph_edge *e; |
c22cacf3 | 1104 | |
257eb6e3 | 1105 | gcc_assert (!node->process); |
b58b1157 JH |
1106 | |
1107 | for (e = node->callers; e; e = e->next_caller) | |
dc0bfe6a | 1108 | if (e->inline_failed) |
b58b1157 | 1109 | break; |
1c4a429a | 1110 | |
7660e67e SB |
1111 | /* We need to output all local functions that are used and not |
1112 | always inlined, as well as those that are reachable from | |
1113 | outside the current compilation unit. */ | |
39ecc018 | 1114 | if (node->analyzed |
18c6ada9 | 1115 | && !node->global.inlined_to |
1c4a429a | 1116 | && (node->needed |
b58b1157 | 1117 | || (e && node->reachable)) |
6de9cd9a | 1118 | && !TREE_ASM_WRITTEN (decl) |
1c4a429a | 1119 | && !DECL_EXTERNAL (decl)) |
257eb6e3 | 1120 | node->process = 1; |
341c100f | 1121 | else |
1a2caa7a NS |
1122 | { |
1123 | /* We should've reclaimed all functions that are not needed. */ | |
1124 | #ifdef ENABLE_CHECKING | |
726a989a | 1125 | if (!node->global.inlined_to |
39ecc018 | 1126 | && gimple_has_body_p (decl) |
1a2caa7a NS |
1127 | && !DECL_EXTERNAL (decl)) |
1128 | { | |
1129 | dump_cgraph_node (stderr, node); | |
1130 | internal_error ("failed to reclaim unneeded function"); | |
1131 | } | |
1132 | #endif | |
726a989a | 1133 | gcc_assert (node->global.inlined_to |
39ecc018 | 1134 | || !gimple_has_body_p (decl) |
1a2caa7a NS |
1135 | || DECL_EXTERNAL (decl)); |
1136 | ||
1137 | } | |
c22cacf3 | 1138 | |
18d13f34 JH |
1139 | } |
1140 | } | |
1141 | ||
1c4a429a | 1142 | /* Expand function specified by NODE. */ |
7660e67e | 1143 | |
1c4a429a | 1144 | static void |
db0e878d | 1145 | cgraph_expand_function (struct cgraph_node *node) |
1c4a429a JH |
1146 | { |
1147 | tree decl = node->decl; | |
1148 | ||
18c6ada9 | 1149 | /* We ought to not compile any inline clones. */ |
341c100f | 1150 | gcc_assert (!node->global.inlined_to); |
18c6ada9 | 1151 | |
7e8b322a | 1152 | announce_function (decl); |
257eb6e3 | 1153 | node->process = 0; |
18d13f34 | 1154 | |
2dee695b | 1155 | gcc_assert (node->lowered); |
776b966e | 1156 | |
a3546141 | 1157 | /* Generate RTL for the body of DECL. */ |
e89d6010 | 1158 | tree_rest_of_compilation (decl); |
18d13f34 | 1159 | |
6de9cd9a | 1160 | /* Make sure that BE didn't give up on compiling. */ |
f30cfcb1 | 1161 | gcc_assert (TREE_ASM_WRITTEN (decl)); |
1c4a429a | 1162 | current_function_decl = NULL; |
39ecc018 JH |
1163 | gcc_assert (!cgraph_preserve_function_body_p (decl)); |
1164 | cgraph_release_function_body (node); | |
1165 | /* Eliminate all call edges. This is important so the GIMPLE_CALL no longer | |
1166 | points to the dead function body. */ | |
1167 | cgraph_node_remove_callees (node); | |
6b02a499 JH |
1168 | |
1169 | cgraph_function_flags_ready = true; | |
1c4a429a JH |
1170 | } |
1171 | ||
18c6ada9 | 1172 | /* Return true when CALLER_DECL should be inlined into CALLEE_DECL. */ |
b58b1157 JH |
1173 | |
1174 | bool | |
61a05df1 | 1175 | cgraph_inline_p (struct cgraph_edge *e, cgraph_inline_failed_t *reason) |
b58b1157 | 1176 | { |
18c6ada9 JH |
1177 | *reason = e->inline_failed; |
1178 | return !e->inline_failed; | |
b58b1157 | 1179 | } |
18c6ada9 | 1180 | |
6674a6ce | 1181 | |
6674a6ce | 1182 | |
db0e878d AJ |
1183 | /* Expand all functions that must be output. |
1184 | ||
b58b1157 JH |
1185 | Attempt to topologically sort the nodes so function is output when |
1186 | all called functions are already assembled to allow data to be | |
a98ebe2e | 1187 | propagated across the callgraph. Use a stack to get smaller distance |
d1a6adeb | 1188 | between a function and its callees (later we may choose to use a more |
b58b1157 JH |
1189 | sophisticated algorithm for function reordering; we will likely want |
1190 | to use subsections to make the output functions appear in top-down | |
1191 | order). */ | |
1192 | ||
1193 | static void | |
a20af5b8 | 1194 | cgraph_expand_all_functions (void) |
b58b1157 JH |
1195 | { |
1196 | struct cgraph_node *node; | |
5ed6ace5 | 1197 | struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); |
f30cfcb1 | 1198 | int order_pos, new_order_pos = 0; |
b58b1157 JH |
1199 | int i; |
1200 | ||
b58b1157 | 1201 | order_pos = cgraph_postorder (order); |
341c100f | 1202 | gcc_assert (order_pos == cgraph_n_nodes); |
b58b1157 | 1203 | |
1ae58c30 | 1204 | /* Garbage collector may remove inline clones we eliminate during |
18c6ada9 JH |
1205 | optimization. So we must be sure to not reference them. */ |
1206 | for (i = 0; i < order_pos; i++) | |
257eb6e3 | 1207 | if (order[i]->process) |
18c6ada9 JH |
1208 | order[new_order_pos++] = order[i]; |
1209 | ||
1210 | for (i = new_order_pos - 1; i >= 0; i--) | |
b58b1157 JH |
1211 | { |
1212 | node = order[i]; | |
257eb6e3 | 1213 | if (node->process) |
b58b1157 | 1214 | { |
341c100f | 1215 | gcc_assert (node->reachable); |
257eb6e3 | 1216 | node->process = 0; |
b58b1157 JH |
1217 | cgraph_expand_function (node); |
1218 | } | |
1219 | } | |
f45e0ad1 | 1220 | cgraph_process_new_functions (); |
50674e96 | 1221 | |
b58b1157 | 1222 | free (order); |
50674e96 | 1223 | |
b58b1157 JH |
1224 | } |
1225 | ||
474eccc6 ILT |
1226 | /* This is used to sort the node types by the cgraph order number. */ |
1227 | ||
24b97832 ILT |
1228 | enum cgraph_order_sort_kind |
1229 | { | |
1230 | ORDER_UNDEFINED = 0, | |
1231 | ORDER_FUNCTION, | |
1232 | ORDER_VAR, | |
1233 | ORDER_ASM | |
1234 | }; | |
1235 | ||
474eccc6 ILT |
1236 | struct cgraph_order_sort |
1237 | { | |
24b97832 | 1238 | enum cgraph_order_sort_kind kind; |
474eccc6 ILT |
1239 | union |
1240 | { | |
1241 | struct cgraph_node *f; | |
8a4a83ed | 1242 | struct varpool_node *v; |
474eccc6 ILT |
1243 | struct cgraph_asm_node *a; |
1244 | } u; | |
1245 | }; | |
1246 | ||
1247 | /* Output all functions, variables, and asm statements in the order | |
1248 | according to their order fields, which is the order in which they | |
1249 | appeared in the file. This implements -fno-toplevel-reorder. In | |
1250 | this mode we may output functions and variables which don't really | |
1251 | need to be output. */ | |
1252 | ||
1253 | static void | |
1254 | cgraph_output_in_order (void) | |
1255 | { | |
1256 | int max; | |
1257 | size_t size; | |
1258 | struct cgraph_order_sort *nodes; | |
1259 | int i; | |
1260 | struct cgraph_node *pf; | |
8a4a83ed | 1261 | struct varpool_node *pv; |
474eccc6 ILT |
1262 | struct cgraph_asm_node *pa; |
1263 | ||
1264 | max = cgraph_order; | |
1265 | size = max * sizeof (struct cgraph_order_sort); | |
1266 | nodes = (struct cgraph_order_sort *) alloca (size); | |
1267 | memset (nodes, 0, size); | |
1268 | ||
8a4a83ed | 1269 | varpool_analyze_pending_decls (); |
474eccc6 ILT |
1270 | |
1271 | for (pf = cgraph_nodes; pf; pf = pf->next) | |
1272 | { | |
257eb6e3 | 1273 | if (pf->process) |
474eccc6 ILT |
1274 | { |
1275 | i = pf->order; | |
1276 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1277 | nodes[i].kind = ORDER_FUNCTION; | |
1278 | nodes[i].u.f = pf; | |
1279 | } | |
1280 | } | |
1281 | ||
8a4a83ed | 1282 | for (pv = varpool_nodes_queue; pv; pv = pv->next_needed) |
474eccc6 ILT |
1283 | { |
1284 | i = pv->order; | |
1285 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1286 | nodes[i].kind = ORDER_VAR; | |
1287 | nodes[i].u.v = pv; | |
1288 | } | |
1289 | ||
1290 | for (pa = cgraph_asm_nodes; pa; pa = pa->next) | |
1291 | { | |
1292 | i = pa->order; | |
1293 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1294 | nodes[i].kind = ORDER_ASM; | |
1295 | nodes[i].u.a = pa; | |
1296 | } | |
474eccc6 | 1297 | |
7386e3ee JH |
1298 | /* In toplevel reorder mode we output all statics; mark them as needed. */ |
1299 | for (i = 0; i < max; ++i) | |
1300 | { | |
1301 | if (nodes[i].kind == ORDER_VAR) | |
1302 | { | |
1303 | varpool_mark_needed_node (nodes[i].u.v); | |
1304 | } | |
1305 | } | |
1306 | varpool_empty_needed_queue (); | |
1307 | ||
474eccc6 ILT |
1308 | for (i = 0; i < max; ++i) |
1309 | { | |
1310 | switch (nodes[i].kind) | |
1311 | { | |
1312 | case ORDER_FUNCTION: | |
257eb6e3 | 1313 | nodes[i].u.f->process = 0; |
474eccc6 ILT |
1314 | cgraph_expand_function (nodes[i].u.f); |
1315 | break; | |
1316 | ||
1317 | case ORDER_VAR: | |
8a4a83ed | 1318 | varpool_assemble_decl (nodes[i].u.v); |
474eccc6 ILT |
1319 | break; |
1320 | ||
1321 | case ORDER_ASM: | |
1322 | assemble_asm (nodes[i].u.a->asm_str); | |
1323 | break; | |
1324 | ||
1325 | case ORDER_UNDEFINED: | |
1326 | break; | |
1327 | ||
1328 | default: | |
1329 | gcc_unreachable (); | |
1330 | } | |
1331 | } | |
e7b9eb2c ILT |
1332 | |
1333 | cgraph_asm_nodes = NULL; | |
474eccc6 ILT |
1334 | } |
1335 | ||
18c6ada9 JH |
1336 | /* Return true when function body of DECL still needs to be kept around |
1337 | for later re-use. */ | |
1338 | bool | |
1339 | cgraph_preserve_function_body_p (tree decl) | |
1340 | { | |
1341 | struct cgraph_node *node; | |
c37f4ba4 JH |
1342 | |
1343 | gcc_assert (cgraph_global_info_ready); | |
18c6ada9 | 1344 | /* Look if there is any clone around. */ |
9187e02d JH |
1345 | node = cgraph_node (decl); |
1346 | if (node->clones) | |
1347 | return true; | |
18c6ada9 JH |
1348 | return false; |
1349 | } | |
1350 | ||
ef330312 PB |
1351 | static void |
1352 | ipa_passes (void) | |
1353 | { | |
db2960f4 | 1354 | set_cfun (NULL); |
04b201a2 | 1355 | current_function_decl = NULL; |
726a989a | 1356 | gimple_register_cfg_hooks (); |
ef330312 PB |
1357 | bitmap_obstack_initialize (NULL); |
1358 | execute_ipa_pass_list (all_ipa_passes); | |
3baf459d DN |
1359 | |
1360 | /* Generate coverage variables and constructors. */ | |
1361 | coverage_finish (); | |
1362 | ||
1363 | /* Process new functions added. */ | |
1364 | set_cfun (NULL); | |
1365 | current_function_decl = NULL; | |
1366 | cgraph_process_new_functions (); | |
1367 | ||
ef330312 PB |
1368 | bitmap_obstack_release (NULL); |
1369 | } | |
1370 | ||
4537ec0c | 1371 | |
1c4a429a JH |
1372 | /* Perform simple optimizations based on callgraph. */ |
1373 | ||
a406865a | 1374 | static void |
db0e878d | 1375 | cgraph_optimize (void) |
1c4a429a | 1376 | { |
413803d3 VR |
1377 | if (errorcount || sorrycount) |
1378 | return; | |
1379 | ||
18c6ada9 JH |
1380 | #ifdef ENABLE_CHECKING |
1381 | verify_cgraph (); | |
1382 | #endif | |
7be82279 | 1383 | |
cd9c7bd2 JH |
1384 | /* Frontend may output common variables after the unit has been finalized. |
1385 | It is safe to deal with them here as they are always zero initialized. */ | |
8a4a83ed | 1386 | varpool_analyze_pending_decls (); |
857e7259 | 1387 | |
a194aa56 | 1388 | timevar_push (TV_CGRAPHOPT); |
a5573239 JH |
1389 | if (pre_ipa_mem_report) |
1390 | { | |
1391 | fprintf (stderr, "Memory consumption before IPA\n"); | |
1392 | dump_memory_report (false); | |
1393 | } | |
b58b1157 | 1394 | if (!quiet_flag) |
a418679d | 1395 | fprintf (stderr, "Performing interprocedural optimizations\n"); |
f45e0ad1 | 1396 | cgraph_state = CGRAPH_STATE_IPA; |
f30cfcb1 | 1397 | |
7e2fe9d8 AP |
1398 | /* Don't run the IPA passes if there was any error or sorry messages. */ |
1399 | if (errorcount == 0 && sorrycount == 0) | |
1400 | ipa_passes (); | |
1401 | ||
4537ec0c DN |
1402 | /* Do nothing else if any IPA pass found errors. */ |
1403 | if (errorcount || sorrycount) | |
1404 | return; | |
1405 | ||
6b02a499 JH |
1406 | /* This pass remove bodies of extern inline functions we never inlined. |
1407 | Do this later so other IPA passes see what is really going on. */ | |
1408 | cgraph_remove_unreachable_nodes (false, dump_file); | |
dafc5b82 | 1409 | cgraph_global_info_ready = true; |
a194aa56 JH |
1410 | if (cgraph_dump_file) |
1411 | { | |
7d82fe7c | 1412 | fprintf (cgraph_dump_file, "Optimized "); |
a194aa56 | 1413 | dump_cgraph (cgraph_dump_file); |
cd9c7bd2 | 1414 | dump_varpool (cgraph_dump_file); |
a194aa56 | 1415 | } |
a5573239 JH |
1416 | if (post_ipa_mem_report) |
1417 | { | |
7fa982e5 | 1418 | fprintf (stderr, "Memory consumption after IPA\n"); |
a5573239 JH |
1419 | dump_memory_report (false); |
1420 | } | |
a194aa56 | 1421 | timevar_pop (TV_CGRAPHOPT); |
1c4a429a | 1422 | |
b58b1157 | 1423 | /* Output everything. */ |
7d82fe7c KC |
1424 | if (!quiet_flag) |
1425 | fprintf (stderr, "Assembling functions:\n"); | |
18c6ada9 JH |
1426 | #ifdef ENABLE_CHECKING |
1427 | verify_cgraph (); | |
1428 | #endif | |
474eccc6 | 1429 | |
9187e02d | 1430 | cgraph_materialize_all_clones (); |
6674a6ce | 1431 | cgraph_mark_functions_to_output (); |
cd9c7bd2 | 1432 | |
f45e0ad1 | 1433 | cgraph_state = CGRAPH_STATE_EXPANSION; |
474eccc6 ILT |
1434 | if (!flag_toplevel_reorder) |
1435 | cgraph_output_in_order (); | |
1436 | else | |
1437 | { | |
1438 | cgraph_output_pending_asms (); | |
1439 | ||
1440 | cgraph_expand_all_functions (); | |
8a4a83ed | 1441 | varpool_remove_unreferenced_decls (); |
474eccc6 | 1442 | |
8a4a83ed | 1443 | varpool_assemble_pending_decls (); |
474eccc6 | 1444 | } |
f45e0ad1 JH |
1445 | cgraph_process_new_functions (); |
1446 | cgraph_state = CGRAPH_STATE_FINISHED; | |
cd9c7bd2 | 1447 | |
a194aa56 JH |
1448 | if (cgraph_dump_file) |
1449 | { | |
7d82fe7c | 1450 | fprintf (cgraph_dump_file, "\nFinal "); |
a194aa56 JH |
1451 | dump_cgraph (cgraph_dump_file); |
1452 | } | |
18c6ada9 JH |
1453 | #ifdef ENABLE_CHECKING |
1454 | verify_cgraph (); | |
6de9cd9a DN |
1455 | /* Double check that all inline clones are gone and that all |
1456 | function bodies have been released from memory. */ | |
7e8b322a | 1457 | if (!(sorrycount || errorcount)) |
6de9cd9a DN |
1458 | { |
1459 | struct cgraph_node *node; | |
1460 | bool error_found = false; | |
1461 | ||
1462 | for (node = cgraph_nodes; node; node = node->next) | |
1463 | if (node->analyzed | |
1464 | && (node->global.inlined_to | |
39ecc018 | 1465 | || gimple_has_body_p (node->decl))) |
6de9cd9a DN |
1466 | { |
1467 | error_found = true; | |
1468 | dump_cgraph_node (stderr, node); | |
c22cacf3 | 1469 | } |
6de9cd9a | 1470 | if (error_found) |
f30cfcb1 | 1471 | internal_error ("nodes with unreleased memory found"); |
6de9cd9a | 1472 | } |
18c6ada9 | 1473 | #endif |
1c4a429a | 1474 | } |
4537ec0c DN |
1475 | |
1476 | ||
873c7164 MM |
1477 | /* Generate and emit a static constructor or destructor. WHICH must |
1478 | be one of 'I' (for a constructor) or 'D' (for a destructor). BODY | |
1479 | is a STATEMENT_LIST containing GENERIC statements. PRIORITY is the | |
fa10beec | 1480 | initialization priority for this constructor or destructor. */ |
c9b9aa64 RH |
1481 | |
1482 | void | |
35b6fdcf | 1483 | cgraph_build_static_cdtor (char which, tree body, int priority) |
c9b9aa64 RH |
1484 | { |
1485 | static int counter = 0; | |
1486 | char which_buf[16]; | |
b785f485 | 1487 | tree decl, name, resdecl; |
c9b9aa64 | 1488 | |
873c7164 MM |
1489 | /* The priority is encoded in the constructor or destructor name. |
1490 | collect2 will sort the names and arrange that they are called at | |
1491 | program startup. */ | |
1492 | sprintf (which_buf, "%c_%.5d_%d", which, priority, counter++); | |
5880f14f | 1493 | name = get_file_function_name (which_buf); |
c9b9aa64 | 1494 | |
c2255bc4 | 1495 | decl = build_decl (input_location, FUNCTION_DECL, name, |
c9b9aa64 RH |
1496 | build_function_type (void_type_node, void_list_node)); |
1497 | current_function_decl = decl; | |
1498 | ||
c2255bc4 AH |
1499 | resdecl = build_decl (input_location, |
1500 | RESULT_DECL, NULL_TREE, void_type_node); | |
b785f485 | 1501 | DECL_ARTIFICIAL (resdecl) = 1; |
b785f485 | 1502 | DECL_RESULT (decl) = resdecl; |
07485407 | 1503 | DECL_CONTEXT (resdecl) = decl; |
b785f485 | 1504 | |
182e0d71 | 1505 | allocate_struct_function (decl, false); |
c9b9aa64 RH |
1506 | |
1507 | TREE_STATIC (decl) = 1; | |
1508 | TREE_USED (decl) = 1; | |
1509 | DECL_ARTIFICIAL (decl) = 1; | |
c9b9aa64 RH |
1510 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; |
1511 | DECL_SAVED_TREE (decl) = body; | |
1512 | TREE_PUBLIC (decl) = ! targetm.have_ctors_dtors; | |
1513 | DECL_UNINLINABLE (decl) = 1; | |
1514 | ||
1515 | DECL_INITIAL (decl) = make_node (BLOCK); | |
1516 | TREE_USED (DECL_INITIAL (decl)) = 1; | |
1517 | ||
1518 | DECL_SOURCE_LOCATION (decl) = input_location; | |
1519 | cfun->function_end_locus = input_location; | |
1520 | ||
341c100f NS |
1521 | switch (which) |
1522 | { | |
1523 | case 'I': | |
1524 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
395a40e0 | 1525 | decl_init_priority_insert (decl, priority); |
341c100f NS |
1526 | break; |
1527 | case 'D': | |
1528 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
395a40e0 | 1529 | decl_fini_priority_insert (decl, priority); |
341c100f NS |
1530 | break; |
1531 | default: | |
1532 | gcc_unreachable (); | |
1533 | } | |
c9b9aa64 RH |
1534 | |
1535 | gimplify_function_tree (decl); | |
1536 | ||
f45e0ad1 JH |
1537 | cgraph_add_new_function (decl, false); |
1538 | cgraph_mark_needed_node (cgraph_node (decl)); | |
cac67c08 | 1539 | set_cfun (NULL); |
c9b9aa64 | 1540 | } |
9b3e897d PB |
1541 | |
1542 | void | |
1543 | init_cgraph (void) | |
1544 | { | |
1545 | cgraph_dump_file = dump_begin (TDI_cgraph, NULL); | |
1546 | } | |
57fb5341 | 1547 | |
c22cacf3 | 1548 | /* The edges representing the callers of the NEW_VERSION node were |
57fb5341 RL |
1549 | fixed by cgraph_function_versioning (), now the call_expr in their |
1550 | respective tree code should be updated to call the NEW_VERSION. */ | |
1551 | ||
1552 | static void | |
1553 | update_call_expr (struct cgraph_node *new_version) | |
1554 | { | |
1555 | struct cgraph_edge *e; | |
1556 | ||
1557 | gcc_assert (new_version); | |
726a989a RB |
1558 | |
1559 | /* Update the call expr on the edges to call the new version. */ | |
57fb5341 | 1560 | for (e = new_version->callers; e; e = e->next_caller) |
c0ab1df3 AP |
1561 | { |
1562 | struct function *inner_function = DECL_STRUCT_FUNCTION (e->caller->decl); | |
1563 | gimple_call_set_fndecl (e->call_stmt, new_version->decl); | |
1d65f45c | 1564 | maybe_clean_eh_stmt_fn (inner_function, e->call_stmt); |
c0ab1df3 | 1565 | } |
57fb5341 RL |
1566 | } |
1567 | ||
1568 | ||
1569 | /* Create a new cgraph node which is the new version of | |
1570 | OLD_VERSION node. REDIRECT_CALLERS holds the callers | |
1571 | edges which should be redirected to point to | |
1572 | NEW_VERSION. ALL the callees edges of OLD_VERSION | |
1573 | are cloned to the new version node. Return the new | |
1574 | version node. */ | |
1575 | ||
1576 | static struct cgraph_node * | |
1577 | cgraph_copy_node_for_versioning (struct cgraph_node *old_version, | |
b2c0ad40 KH |
1578 | tree new_decl, |
1579 | VEC(cgraph_edge_p,heap) *redirect_callers) | |
57fb5341 RL |
1580 | { |
1581 | struct cgraph_node *new_version; | |
1582 | struct cgraph_edge *e, *new_e; | |
1583 | struct cgraph_edge *next_callee; | |
1584 | unsigned i; | |
1585 | ||
1586 | gcc_assert (old_version); | |
c22cacf3 | 1587 | |
57fb5341 RL |
1588 | new_version = cgraph_node (new_decl); |
1589 | ||
1590 | new_version->analyzed = true; | |
1591 | new_version->local = old_version->local; | |
1592 | new_version->global = old_version->global; | |
1593 | new_version->rtl = new_version->rtl; | |
1594 | new_version->reachable = true; | |
1595 | new_version->count = old_version->count; | |
1596 | ||
1597 | /* Clone the old node callees. Recursive calls are | |
1598 | also cloned. */ | |
1599 | for (e = old_version->callees;e; e=e->next_callee) | |
1600 | { | |
45a80bb9 JH |
1601 | new_e = cgraph_clone_edge (e, new_version, e->call_stmt, 0, e->frequency, |
1602 | e->loop_nest, true); | |
57fb5341 RL |
1603 | new_e->count = e->count; |
1604 | } | |
1605 | /* Fix recursive calls. | |
1606 | If OLD_VERSION has a recursive call after the | |
1607 | previous edge cloning, the new version will have an edge | |
1608 | pointing to the old version, which is wrong; | |
1609 | Redirect it to point to the new version. */ | |
1610 | for (e = new_version->callees ; e; e = next_callee) | |
1611 | { | |
1612 | next_callee = e->next_callee; | |
1613 | if (e->callee == old_version) | |
1614 | cgraph_redirect_edge_callee (e, new_version); | |
c22cacf3 | 1615 | |
57fb5341 RL |
1616 | if (!next_callee) |
1617 | break; | |
1618 | } | |
b2c0ad40 KH |
1619 | for (i = 0; VEC_iterate (cgraph_edge_p, redirect_callers, i, e); i++) |
1620 | { | |
1621 | /* Redirect calls to the old version node to point to its new | |
1622 | version. */ | |
1623 | cgraph_redirect_edge_callee (e, new_version); | |
1624 | } | |
57fb5341 RL |
1625 | |
1626 | return new_version; | |
1627 | } | |
1628 | ||
1629 | /* Perform function versioning. | |
c22cacf3 | 1630 | Function versioning includes copying of the tree and |
57fb5341 RL |
1631 | a callgraph update (creating a new cgraph node and updating |
1632 | its callees and callers). | |
1633 | ||
1634 | REDIRECT_CALLERS varray includes the edges to be redirected | |
1635 | to the new version. | |
1636 | ||
1637 | TREE_MAP is a mapping of tree nodes we want to replace with | |
1638 | new ones (according to results of prior analysis). | |
1639 | OLD_VERSION_NODE is the node that is versioned. | |
c6f7cfc1 JH |
1640 | It returns the new version's cgraph node. |
1641 | ARGS_TO_SKIP lists arguments to be omitted from functions | |
1642 | */ | |
57fb5341 RL |
1643 | |
1644 | struct cgraph_node * | |
1645 | cgraph_function_versioning (struct cgraph_node *old_version_node, | |
b2c0ad40 | 1646 | VEC(cgraph_edge_p,heap) *redirect_callers, |
9187e02d | 1647 | VEC (ipa_replace_map_p,gc)* tree_map, |
c6f7cfc1 | 1648 | bitmap args_to_skip) |
57fb5341 RL |
1649 | { |
1650 | tree old_decl = old_version_node->decl; | |
1651 | struct cgraph_node *new_version_node = NULL; | |
1652 | tree new_decl; | |
1653 | ||
1654 | if (!tree_versionable_function_p (old_decl)) | |
1655 | return NULL; | |
1656 | ||
1657 | /* Make a new FUNCTION_DECL tree node for the | |
1658 | new version. */ | |
c6f7cfc1 JH |
1659 | if (!args_to_skip) |
1660 | new_decl = copy_node (old_decl); | |
1661 | else | |
1662 | new_decl = build_function_decl_skip_args (old_decl, args_to_skip); | |
57fb5341 RL |
1663 | |
1664 | /* Create the new version's call-graph node. | |
1665 | and update the edges of the new node. */ | |
1666 | new_version_node = | |
1667 | cgraph_copy_node_for_versioning (old_version_node, new_decl, | |
1668 | redirect_callers); | |
1669 | ||
1670 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
c6f7cfc1 | 1671 | tree_function_versioning (old_decl, new_decl, tree_map, false, args_to_skip); |
57fb5341 | 1672 | |
c22cacf3 | 1673 | /* Update the new version's properties. |
c0ab1df3 AP |
1674 | Make The new version visible only within this translation unit. Make sure |
1675 | that is not weak also. | |
c22cacf3 | 1676 | ??? We cannot use COMDAT linkage because there is no |
57fb5341 RL |
1677 | ABI support for this. */ |
1678 | DECL_EXTERNAL (new_version_node->decl) = 0; | |
fc26fae3 | 1679 | DECL_COMDAT_GROUP (new_version_node->decl) = NULL_TREE; |
57fb5341 RL |
1680 | TREE_PUBLIC (new_version_node->decl) = 0; |
1681 | DECL_COMDAT (new_version_node->decl) = 0; | |
c0ab1df3 | 1682 | DECL_WEAK (new_version_node->decl) = 0; |
e6e1c050 | 1683 | DECL_VIRTUAL_P (new_version_node->decl) = 0; |
57fb5341 RL |
1684 | new_version_node->local.externally_visible = 0; |
1685 | new_version_node->local.local = 1; | |
1686 | new_version_node->lowered = true; | |
e6e1c050 | 1687 | |
c0ab1df3 AP |
1688 | /* Update the call_expr on the edges to call the new version node. */ |
1689 | update_call_expr (new_version_node); | |
1690 | ||
129a37fc | 1691 | cgraph_call_function_insertion_hooks (new_version_node); |
57fb5341 RL |
1692 | return new_version_node; |
1693 | } | |
ea99e0be JH |
1694 | |
1695 | /* Produce separate function body for inline clones so the offline copy can be | |
1696 | modified without affecting them. */ | |
1697 | struct cgraph_node * | |
1698 | save_inline_function_body (struct cgraph_node *node) | |
1699 | { | |
9187e02d | 1700 | struct cgraph_node *first_clone, *n; |
ea99e0be JH |
1701 | |
1702 | gcc_assert (node == cgraph_node (node->decl)); | |
1703 | ||
1704 | cgraph_lower_function (node); | |
1705 | ||
9187e02d | 1706 | first_clone = node->clones; |
ea99e0be JH |
1707 | |
1708 | first_clone->decl = copy_node (node->decl); | |
ea99e0be JH |
1709 | cgraph_insert_node_to_hashtable (first_clone); |
1710 | gcc_assert (first_clone == cgraph_node (first_clone->decl)); | |
9187e02d JH |
1711 | if (first_clone->next_sibling_clone) |
1712 | { | |
1713 | for (n = first_clone->next_sibling_clone; n->next_sibling_clone; n = n->next_sibling_clone) | |
1714 | n->clone_of = first_clone; | |
1715 | n->clone_of = first_clone; | |
1716 | n->next_sibling_clone = first_clone->clones; | |
1717 | if (first_clone->clones) | |
1718 | first_clone->clones->prev_sibling_clone = n; | |
1719 | first_clone->clones = first_clone->next_sibling_clone; | |
1720 | first_clone->next_sibling_clone->prev_sibling_clone = NULL; | |
1721 | first_clone->next_sibling_clone = NULL; | |
1722 | gcc_assert (!first_clone->prev_sibling_clone); | |
1723 | } | |
1724 | first_clone->clone_of = NULL; | |
1725 | node->clones = NULL; | |
1726 | ||
1727 | if (first_clone->clones) | |
1728 | for (n = first_clone->clones; n != first_clone;) | |
1729 | { | |
1730 | gcc_assert (n->decl == node->decl); | |
1731 | n->decl = first_clone->decl; | |
1732 | if (n->clones) | |
1733 | n = n->clones; | |
1734 | else if (n->next_sibling_clone) | |
1735 | n = n->next_sibling_clone; | |
1736 | else | |
1737 | { | |
1738 | while (n != first_clone && !n->next_sibling_clone) | |
1739 | n = n->clone_of; | |
1740 | if (n != first_clone) | |
1741 | n = n->next_sibling_clone; | |
1742 | } | |
1743 | } | |
ea99e0be JH |
1744 | |
1745 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
c6f7cfc1 | 1746 | tree_function_versioning (node->decl, first_clone->decl, NULL, true, NULL); |
ea99e0be JH |
1747 | |
1748 | DECL_EXTERNAL (first_clone->decl) = 0; | |
fc26fae3 | 1749 | DECL_COMDAT_GROUP (first_clone->decl) = NULL_TREE; |
ea99e0be JH |
1750 | TREE_PUBLIC (first_clone->decl) = 0; |
1751 | DECL_COMDAT (first_clone->decl) = 0; | |
21ecdec5 JH |
1752 | VEC_free (ipa_opt_pass, heap, |
1753 | DECL_STRUCT_FUNCTION (first_clone->decl)->ipa_transforms_to_apply); | |
1754 | DECL_STRUCT_FUNCTION (first_clone->decl)->ipa_transforms_to_apply = NULL; | |
ea99e0be | 1755 | |
ea99e0be JH |
1756 | #ifdef ENABLE_CHECKING |
1757 | verify_cgraph_node (first_clone); | |
1758 | #endif | |
1759 | return first_clone; | |
1760 | } | |
7be82279 | 1761 | |
9187e02d JH |
1762 | /* Given virtual clone, turn it into actual clone. */ |
1763 | static void | |
1764 | cgraph_materialize_clone (struct cgraph_node *node) | |
1765 | { | |
1766 | bitmap_obstack_initialize (NULL); | |
1767 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
1768 | tree_function_versioning (node->clone_of->decl, node->decl, | |
1769 | node->clone.tree_map, true, | |
1770 | node->clone.args_to_skip); | |
08ad1d6d JH |
1771 | if (cgraph_dump_file) |
1772 | { | |
1773 | dump_function_to_file (node->clone_of->decl, cgraph_dump_file, dump_flags); | |
1774 | dump_function_to_file (node->decl, cgraph_dump_file, dump_flags); | |
1775 | } | |
9187e02d JH |
1776 | |
1777 | /* Function is no longer clone. */ | |
1778 | if (node->next_sibling_clone) | |
1779 | node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone; | |
1780 | if (node->prev_sibling_clone) | |
1781 | node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone; | |
1782 | else | |
1783 | node->clone_of->clones = node->next_sibling_clone; | |
1784 | node->next_sibling_clone = NULL; | |
1785 | node->prev_sibling_clone = NULL; | |
1786 | node->clone_of = NULL; | |
1787 | bitmap_obstack_release (NULL); | |
1788 | } | |
1789 | ||
1790 | /* Once all functions from compilation unit are in memory, produce all clones | |
1791 | and update all calls. | |
1792 | We might also do this on demand if we don't want to bring all functions to | |
1793 | memory prior compilation, but current WHOPR implementation does that and it is | |
1794 | is bit easier to keep everything right in this order. */ | |
1795 | void | |
1796 | cgraph_materialize_all_clones (void) | |
1797 | { | |
1798 | struct cgraph_node *node; | |
1799 | bool stabilized = false; | |
1800 | ||
1801 | if (cgraph_dump_file) | |
1802 | fprintf (cgraph_dump_file, "Materializing clones\n"); | |
1803 | #ifdef ENABLE_CHECKING | |
1804 | verify_cgraph (); | |
1805 | #endif | |
1806 | ||
1807 | /* We can also do topological order, but number of iterations should be | |
1808 | bounded by number of IPA passes since single IPA pass is probably not | |
1809 | going to create clones of clones it created itself. */ | |
1810 | while (!stabilized) | |
1811 | { | |
1812 | stabilized = true; | |
1813 | for (node = cgraph_nodes; node; node = node->next) | |
1814 | { | |
1815 | if (node->clone_of && node->decl != node->clone_of->decl | |
1816 | && !gimple_has_body_p (node->decl)) | |
1817 | { | |
1818 | if (gimple_has_body_p (node->clone_of->decl)) | |
1819 | { | |
1820 | if (cgraph_dump_file) | |
08ad1d6d JH |
1821 | { |
1822 | fprintf (cgraph_dump_file, "clonning %s to %s\n", | |
1823 | cgraph_node_name (node->clone_of), | |
1824 | cgraph_node_name (node)); | |
1825 | if (node->clone.tree_map) | |
1826 | { | |
1827 | unsigned int i; | |
1828 | fprintf (cgraph_dump_file, " replace map: "); | |
1829 | for (i = 0; i < VEC_length (ipa_replace_map_p, | |
1830 | node->clone.tree_map); | |
1831 | i++) | |
1832 | { | |
1833 | struct ipa_replace_map *replace_info; | |
1834 | replace_info = VEC_index (ipa_replace_map_p, | |
1835 | node->clone.tree_map, | |
1836 | i); | |
1837 | print_generic_expr (cgraph_dump_file, replace_info->old_tree, 0); | |
1838 | fprintf (cgraph_dump_file, " -> "); | |
1839 | print_generic_expr (cgraph_dump_file, replace_info->new_tree, 0); | |
1840 | fprintf (cgraph_dump_file, "%s%s;", | |
1841 | replace_info->replace_p ? "(replace)":"", | |
1842 | replace_info->ref_p ? "(ref)":""); | |
1843 | } | |
1844 | fprintf (cgraph_dump_file, "\n"); | |
1845 | } | |
1846 | if (node->clone.args_to_skip) | |
1847 | { | |
1848 | fprintf (cgraph_dump_file, " args_to_skip: "); | |
1849 | dump_bitmap (cgraph_dump_file, node->clone.args_to_skip); | |
1850 | } | |
1851 | if (node->clone.args_to_skip) | |
1852 | { | |
1853 | fprintf (cgraph_dump_file, " combined_args_to_skip:"); | |
1854 | dump_bitmap (cgraph_dump_file, node->clone.combined_args_to_skip); | |
1855 | } | |
1856 | } | |
9187e02d JH |
1857 | cgraph_materialize_clone (node); |
1858 | } | |
1859 | else | |
1860 | stabilized = false; | |
1861 | } | |
1862 | } | |
1863 | } | |
1864 | if (cgraph_dump_file) | |
1865 | fprintf (cgraph_dump_file, "Updating call sites\n"); | |
1866 | for (node = cgraph_nodes; node; node = node->next) | |
1867 | if (node->analyzed && gimple_has_body_p (node->decl) | |
1868 | && (!node->clone_of || node->clone_of->decl != node->decl)) | |
1869 | { | |
1870 | struct cgraph_edge *e; | |
1871 | ||
1872 | current_function_decl = node->decl; | |
1873 | push_cfun (DECL_STRUCT_FUNCTION (node->decl)); | |
1874 | for (e = node->callees; e; e = e->next_callee) | |
1875 | { | |
1876 | tree decl = gimple_call_fndecl (e->call_stmt); | |
9a23acef JH |
1877 | /* When function gets inlined, indirect inlining might've invented |
1878 | new edge for orginally indirect stmt. Since we are not | |
1879 | preserving clones in the original form, we must not update here | |
1880 | since other inline clones don't need to contain call to the same | |
1881 | call. Inliner will do the substitution for us later. */ | |
1882 | if (decl && decl != e->callee->decl) | |
9187e02d JH |
1883 | { |
1884 | gimple new_stmt; | |
1885 | gimple_stmt_iterator gsi; | |
1886 | ||
1887 | if (cgraph_dump_file) | |
1888 | { | |
1889 | fprintf (cgraph_dump_file, "updating call of %s in %s:", | |
1890 | cgraph_node_name (node), | |
1891 | cgraph_node_name (e->callee)); | |
1892 | print_gimple_stmt (cgraph_dump_file, e->call_stmt, 0, dump_flags); | |
1893 | } | |
1894 | ||
08ad1d6d | 1895 | if (e->callee->clone.combined_args_to_skip) |
9187e02d | 1896 | new_stmt = gimple_call_copy_skip_args (e->call_stmt, |
08ad1d6d | 1897 | e->callee->clone.combined_args_to_skip); |
9187e02d JH |
1898 | else |
1899 | new_stmt = e->call_stmt; | |
1900 | if (gimple_vdef (new_stmt) | |
1901 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
1902 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
1903 | gimple_call_set_fndecl (new_stmt, e->callee->decl); | |
1904 | ||
1905 | gsi = gsi_for_stmt (e->call_stmt); | |
1906 | gsi_replace (&gsi, new_stmt, true); | |
1907 | ||
1908 | /* Update EH information too, just in case. */ | |
1d65f45c | 1909 | maybe_clean_or_replace_eh_stmt (e->call_stmt, new_stmt); |
9187e02d JH |
1910 | |
1911 | cgraph_set_call_stmt_including_clones (node, e->call_stmt, new_stmt); | |
1912 | ||
1913 | if (cgraph_dump_file) | |
1914 | { | |
1915 | fprintf (cgraph_dump_file, " updated to:"); | |
1916 | print_gimple_stmt (cgraph_dump_file, e->call_stmt, 0, dump_flags); | |
1917 | } | |
1918 | } | |
1919 | } | |
1920 | pop_cfun (); | |
1921 | current_function_decl = NULL; | |
1922 | #ifdef ENABLE_CHECKING | |
1923 | verify_cgraph_node (node); | |
1924 | #endif | |
1925 | } | |
9a23acef JH |
1926 | #ifdef ENABLE_CHECKING |
1927 | verify_cgraph (); | |
1928 | #endif | |
9187e02d JH |
1929 | cgraph_remove_unreachable_nodes (false, cgraph_dump_file); |
1930 | } | |
1931 | ||
7be82279 | 1932 | #include "gt-cgraphunit.h" |