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cd6bca02 | 1 | /* Callgraph based interprocedural optimizations. |
aed6e608 | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
3 | 2011 Free Software Foundation, Inc. | |
ae01b312 | 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 | |
8c4c00c1 | 10 | Software Foundation; either version 3, or (at your option) any later |
ae01b312 | 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/>. */ | |
ae01b312 | 21 | |
b0cdf642 | 22 | /* This module implements main driver of compilation process as well as |
cd6bca02 | 23 | few basic interprocedural optimizers. |
b0cdf642 | 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 | ||
b326746d | 35 | (There is one exception needed for implementing GCC extern inline |
36 | function.) | |
b0cdf642 | 37 | |
1d416bd7 | 38 | - varpool_finalize_variable |
b0cdf642 | 39 | |
7bd28bba | 40 | This function has same behavior as the above but is used for static |
b0cdf642 | 41 | variables. |
42 | ||
43 | - cgraph_finalize_compilation_unit | |
44 | ||
b326746d | 45 | This function is called once (source level) compilation unit is finalized |
46 | and it will no longer change. | |
b0cdf642 | 47 | |
6329636b | 48 | In the the call-graph construction and local function |
b0cdf642 | 49 | analysis takes place here. Bodies of unreachable functions are released |
50 | to conserve memory usage. | |
51 | ||
b326746d | 52 | The function can be called multiple times when multiple source level |
53 | compilation units are combined (such as in C frontend) | |
b0cdf642 | 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 | ||
b0cdf642 | 62 | - cgraph_mark_needed_node |
1d416bd7 | 63 | - varpool_mark_needed_node |
b0cdf642 | 64 | |
b326746d | 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 | |
ccd2f3d1 | 69 | used by C++ frontend to explicitly mark the keyed methods. |
b0cdf642 | 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 | ||
6329636b | 80 | Analyzing of all functions is deferred |
b0cdf642 | 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 | ||
ca67a72b | 91 | The intra-procedural information is produced and its existence |
b0cdf642 | 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 | |
6329636b | 106 | where reference has been optimized out. */ |
121f3051 | 107 | |
acc70efa | 108 | |
ae01b312 | 109 | #include "config.h" |
110 | #include "system.h" | |
111 | #include "coretypes.h" | |
112 | #include "tm.h" | |
113 | #include "tree.h" | |
b5530559 | 114 | #include "rtl.h" |
acc70efa | 115 | #include "tree-flow.h" |
ae01b312 | 116 | #include "tree-inline.h" |
117 | #include "langhooks.h" | |
c6224531 | 118 | #include "pointer-set.h" |
ae01b312 | 119 | #include "toplev.h" |
120 | #include "flags.h" | |
121 | #include "ggc.h" | |
122 | #include "debug.h" | |
123 | #include "target.h" | |
124 | #include "cgraph.h" | |
80a85d8a | 125 | #include "diagnostic.h" |
ce084dfc | 126 | #include "tree-pretty-print.h" |
127 | #include "gimple-pretty-print.h" | |
f79b6507 | 128 | #include "timevar.h" |
d7c6d889 | 129 | #include "params.h" |
130 | #include "fibheap.h" | |
611e5405 | 131 | #include "intl.h" |
b69eb0ff | 132 | #include "function.h" |
b5d36404 | 133 | #include "ipa-prop.h" |
75a70cf9 | 134 | #include "gimple.h" |
135 | #include "tree-iterator.h" | |
f1e2a033 | 136 | #include "tree-pass.h" |
bfec3452 | 137 | #include "tree-dump.h" |
c1dcd13c | 138 | #include "output.h" |
9ed5b1f5 | 139 | #include "coverage.h" |
c9036234 | 140 | #include "plugin.h" |
d7c6d889 | 141 | |
a6868229 | 142 | static void cgraph_expand_all_functions (void); |
d9d9733a | 143 | static void cgraph_mark_functions_to_output (void); |
144 | static void cgraph_expand_function (struct cgraph_node *); | |
f788fff2 | 145 | static void cgraph_output_pending_asms (void); |
bfec3452 | 146 | static void cgraph_analyze_function (struct cgraph_node *); |
25bb88de | 147 | |
ecb08119 | 148 | FILE *cgraph_dump_file; |
121f3051 | 149 | |
28454517 | 150 | /* Used for vtable lookup in thunk adjusting. */ |
151 | static GTY (()) tree vtable_entry_type; | |
152 | ||
2c0b522d | 153 | /* Determine if function DECL is needed. That is, visible to something |
154 | either outside this translation unit, something magic in the system | |
6329636b | 155 | configury. */ |
2c0b522d | 156 | |
7bfefa9d | 157 | bool |
158 | cgraph_decide_is_function_needed (struct cgraph_node *node, tree decl) | |
2c0b522d | 159 | { |
3f82b628 | 160 | /* If the user told us it is used, then it must be so. */ |
05806473 | 161 | if (node->local.externally_visible) |
162 | return true; | |
163 | ||
3f82b628 | 164 | /* ??? If the assembler name is set by hand, it is possible to assemble |
165 | the name later after finalizing the function and the fact is noticed | |
166 | in assemble_name then. This is arguably a bug. */ | |
167 | if (DECL_ASSEMBLER_NAME_SET_P (decl) | |
168 | && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) | |
169 | return true; | |
170 | ||
55680bef | 171 | /* With -fkeep-inline-functions we are keeping all inline functions except |
172 | for extern inline ones. */ | |
173 | if (flag_keep_inline_functions | |
174 | && DECL_DECLARED_INLINE_P (decl) | |
316ef6d8 | 175 | && !DECL_EXTERNAL (decl) |
176 | && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl))) | |
55680bef | 177 | return true; |
178 | ||
2c0b522d | 179 | /* If we decided it was needed before, but at the time we didn't have |
180 | the body of the function available, then it's still needed. We have | |
181 | to go back and re-check its dependencies now. */ | |
182 | if (node->needed) | |
183 | return true; | |
184 | ||
185 | /* Externally visible functions must be output. The exception is | |
a0c938f0 | 186 | COMDAT functions that must be output only when they are needed. |
8baa9d15 | 187 | |
188 | When not optimizing, also output the static functions. (see | |
95da6220 | 189 | PR24561), but don't do so for always_inline functions, functions |
0f9238c0 | 190 | declared inline and nested functions. These were optimized out |
d3d410e1 | 191 | in the original implementation and it is unclear whether we want |
554f2707 | 192 | to change the behavior here. */ |
bba7ddf8 | 193 | if (((TREE_PUBLIC (decl) |
0f9238c0 | 194 | || (!optimize |
195 | && !node->local.disregard_inline_limits | |
d3d410e1 | 196 | && !DECL_DECLARED_INLINE_P (decl) |
0f9238c0 | 197 | && !(DECL_CONTEXT (decl) |
198 | && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL))) | |
59dd4830 | 199 | && !flag_whole_program |
cbcf2791 | 200 | && !flag_lto) |
62eec3b4 | 201 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) |
2c0b522d | 202 | return true; |
203 | ||
2c0b522d | 204 | return false; |
205 | } | |
206 | ||
bdc40eb8 | 207 | /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these |
523c1122 | 208 | functions into callgraph in a way so they look like ordinary reachable |
209 | functions inserted into callgraph already at construction time. */ | |
210 | ||
211 | bool | |
212 | cgraph_process_new_functions (void) | |
213 | { | |
214 | bool output = false; | |
215 | tree fndecl; | |
216 | struct cgraph_node *node; | |
217 | ||
0cddb138 | 218 | varpool_analyze_pending_decls (); |
523c1122 | 219 | /* Note that this queue may grow as its being processed, as the new |
220 | functions may generate new ones. */ | |
221 | while (cgraph_new_nodes) | |
222 | { | |
223 | node = cgraph_new_nodes; | |
224 | fndecl = node->decl; | |
225 | cgraph_new_nodes = cgraph_new_nodes->next_needed; | |
226 | switch (cgraph_state) | |
227 | { | |
228 | case CGRAPH_STATE_CONSTRUCTION: | |
229 | /* At construction time we just need to finalize function and move | |
230 | it into reachable functions list. */ | |
231 | ||
232 | node->next_needed = NULL; | |
233 | cgraph_finalize_function (fndecl, false); | |
234 | cgraph_mark_reachable_node (node); | |
235 | output = true; | |
236 | break; | |
237 | ||
238 | case CGRAPH_STATE_IPA: | |
f517b36e | 239 | case CGRAPH_STATE_IPA_SSA: |
523c1122 | 240 | /* When IPA optimization already started, do all essential |
241 | transformations that has been already performed on the whole | |
242 | cgraph but not on this function. */ | |
243 | ||
75a70cf9 | 244 | gimple_register_cfg_hooks (); |
523c1122 | 245 | if (!node->analyzed) |
246 | cgraph_analyze_function (node); | |
247 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
248 | current_function_decl = fndecl; | |
9c1bff7a | 249 | compute_inline_parameters (node); |
f517b36e | 250 | if ((cgraph_state == CGRAPH_STATE_IPA_SSA |
251 | && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
252 | /* When not optimizing, be sure we run early local passes anyway | |
253 | to expand OMP. */ | |
254 | || !optimize) | |
20099e35 | 255 | execute_pass_list (pass_early_local_passes.pass.sub); |
523c1122 | 256 | free_dominance_info (CDI_POST_DOMINATORS); |
257 | free_dominance_info (CDI_DOMINATORS); | |
258 | pop_cfun (); | |
259 | current_function_decl = NULL; | |
260 | break; | |
261 | ||
262 | case CGRAPH_STATE_EXPANSION: | |
263 | /* Functions created during expansion shall be compiled | |
264 | directly. */ | |
09fc9532 | 265 | node->process = 0; |
523c1122 | 266 | cgraph_expand_function (node); |
267 | break; | |
268 | ||
269 | default: | |
270 | gcc_unreachable (); | |
271 | break; | |
272 | } | |
50828ed8 | 273 | cgraph_call_function_insertion_hooks (node); |
0cddb138 | 274 | varpool_analyze_pending_decls (); |
523c1122 | 275 | } |
276 | return output; | |
277 | } | |
278 | ||
9b8fb23a | 279 | /* As an GCC extension we allow redefinition of the function. The |
280 | semantics when both copies of bodies differ is not well defined. | |
281 | We replace the old body with new body so in unit at a time mode | |
282 | we always use new body, while in normal mode we may end up with | |
283 | old body inlined into some functions and new body expanded and | |
284 | inlined in others. | |
285 | ||
286 | ??? It may make more sense to use one body for inlining and other | |
287 | body for expanding the function but this is difficult to do. */ | |
288 | ||
289 | static void | |
290 | cgraph_reset_node (struct cgraph_node *node) | |
291 | { | |
09fc9532 | 292 | /* If node->process is set, then we have already begun whole-unit analysis. |
6329636b | 293 | This is *not* testing for whether we've already emitted the function. |
294 | That case can be sort-of legitimately seen with real function redefinition | |
295 | errors. I would argue that the front end should never present us with | |
296 | such a case, but don't enforce that for now. */ | |
09fc9532 | 297 | gcc_assert (!node->process); |
9b8fb23a | 298 | |
299 | /* Reset our data structures so we can analyze the function again. */ | |
300 | memset (&node->local, 0, sizeof (node->local)); | |
301 | memset (&node->global, 0, sizeof (node->global)); | |
302 | memset (&node->rtl, 0, sizeof (node->rtl)); | |
303 | node->analyzed = false; | |
304 | node->local.redefined_extern_inline = true; | |
305 | node->local.finalized = false; | |
306 | ||
9b8fb23a | 307 | cgraph_node_remove_callees (node); |
308 | ||
309 | /* We may need to re-queue the node for assembling in case | |
46beef9a | 310 | we already proceeded it and ignored as not needed or got |
311 | a re-declaration in IMA mode. */ | |
312 | if (node->reachable) | |
9b8fb23a | 313 | { |
314 | struct cgraph_node *n; | |
315 | ||
316 | for (n = cgraph_nodes_queue; n; n = n->next_needed) | |
317 | if (n == node) | |
318 | break; | |
319 | if (!n) | |
320 | node->reachable = 0; | |
321 | } | |
322 | } | |
c08871a9 | 323 | |
1e8e9920 | 324 | static void |
325 | cgraph_lower_function (struct cgraph_node *node) | |
326 | { | |
327 | if (node->lowered) | |
328 | return; | |
bfec3452 | 329 | |
330 | if (node->nested) | |
331 | lower_nested_functions (node->decl); | |
332 | gcc_assert (!node->nested); | |
333 | ||
1e8e9920 | 334 | tree_lowering_passes (node->decl); |
335 | node->lowered = true; | |
336 | } | |
337 | ||
28df663b | 338 | /* DECL has been parsed. Take it, queue it, compile it at the whim of the |
339 | logic in effect. If NESTED is true, then our caller cannot stand to have | |
340 | the garbage collector run at the moment. We would need to either create | |
341 | a new GC context, or just not compile right now. */ | |
ae01b312 | 342 | |
343 | void | |
28df663b | 344 | cgraph_finalize_function (tree decl, bool nested) |
ae01b312 | 345 | { |
346 | struct cgraph_node *node = cgraph_node (decl); | |
347 | ||
c08871a9 | 348 | if (node->local.finalized) |
9b8fb23a | 349 | cgraph_reset_node (node); |
28df663b | 350 | |
167b550b | 351 | node->pid = cgraph_max_pid ++; |
c08871a9 | 352 | notice_global_symbol (decl); |
79bb87b4 | 353 | node->local.finalized = true; |
e27482aa | 354 | node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL; |
22c748a1 | 355 | node->finalized_by_frontend = true; |
ae01b312 | 356 | |
7bfefa9d | 357 | if (cgraph_decide_is_function_needed (node, decl)) |
2c0b522d | 358 | cgraph_mark_needed_node (node); |
359 | ||
ecda6e51 | 360 | /* Since we reclaim unreachable nodes at the end of every language |
3f82b628 | 361 | level unit, we need to be conservative about possible entry points |
362 | there. */ | |
1e3aebec | 363 | if ((TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) |
364 | || DECL_STATIC_CONSTRUCTOR (decl) | |
d050bafd | 365 | || DECL_STATIC_DESTRUCTOR (decl) |
366 | /* COMDAT virtual functions may be referenced by vtable from | |
367 | other compilatoin unit. Still we want to devirtualize calls | |
368 | to those so we need to analyze them. | |
369 | FIXME: We should introduce may edges for this purpose and update | |
370 | their handling in unreachable function removal and inliner too. */ | |
371 | || (DECL_VIRTUAL_P (decl) && (DECL_COMDAT (decl) || DECL_EXTERNAL (decl)))) | |
3f82b628 | 372 | cgraph_mark_reachable_node (node); |
373 | ||
2c0b522d | 374 | /* If we've not yet emitted decl, tell the debug info about it. */ |
28df663b | 375 | if (!TREE_ASM_WRITTEN (decl)) |
2c0b522d | 376 | (*debug_hooks->deferred_inline_function) (decl); |
4e8871a0 | 377 | |
b69eb0ff | 378 | /* Possibly warn about unused parameters. */ |
379 | if (warn_unused_parameter) | |
380 | do_warn_unused_parameter (decl); | |
6329636b | 381 | |
382 | if (!nested) | |
383 | ggc_collect (); | |
ae01b312 | 384 | } |
385 | ||
0da03d11 | 386 | /* C99 extern inline keywords allow changing of declaration after function |
387 | has been finalized. We need to re-decide if we want to mark the function as | |
388 | needed then. */ | |
389 | ||
390 | void | |
391 | cgraph_mark_if_needed (tree decl) | |
392 | { | |
393 | struct cgraph_node *node = cgraph_node (decl); | |
7bfefa9d | 394 | if (node->local.finalized && cgraph_decide_is_function_needed (node, decl)) |
0da03d11 | 395 | cgraph_mark_needed_node (node); |
396 | } | |
397 | ||
ccf4ab6b | 398 | /* Return TRUE if NODE2 is equivalent to NODE or its clone. */ |
399 | static bool | |
400 | clone_of_p (struct cgraph_node *node, struct cgraph_node *node2) | |
401 | { | |
402 | while (node != node2 && node2) | |
403 | node2 = node2->clone_of; | |
404 | return node2 != NULL; | |
405 | } | |
406 | ||
1a036a3b | 407 | /* Verify edge E count and frequency. */ |
408 | ||
409 | static bool | |
410 | verify_edge_count_and_frequency (struct cgraph_edge *e) | |
411 | { | |
412 | bool error_found = false; | |
413 | if (e->count < 0) | |
414 | { | |
415 | error ("caller edge count is negative"); | |
416 | error_found = true; | |
417 | } | |
418 | if (e->frequency < 0) | |
419 | { | |
420 | error ("caller edge frequency is negative"); | |
421 | error_found = true; | |
422 | } | |
423 | if (e->frequency > CGRAPH_FREQ_MAX) | |
424 | { | |
425 | error ("caller edge frequency is too large"); | |
426 | error_found = true; | |
427 | } | |
428 | if (gimple_has_body_p (e->caller->decl) | |
429 | && !e->caller->global.inlined_to | |
430 | && (e->frequency | |
431 | != compute_call_stmt_bb_frequency (e->caller->decl, | |
432 | gimple_bb (e->call_stmt)))) | |
433 | { | |
434 | error ("caller edge frequency %i does not match BB freqency %i", | |
435 | e->frequency, | |
436 | compute_call_stmt_bb_frequency (e->caller->decl, | |
437 | gimple_bb (e->call_stmt))); | |
438 | error_found = true; | |
439 | } | |
440 | return error_found; | |
441 | } | |
442 | ||
7b29dd2f | 443 | /* Switch to THIS_CFUN if needed and print STMT to stderr. */ |
444 | static void | |
445 | cgraph_debug_gimple_stmt (struct function *this_cfun, gimple stmt) | |
446 | { | |
447 | /* debug_gimple_stmt needs correct cfun */ | |
448 | if (cfun != this_cfun) | |
449 | set_cfun (this_cfun); | |
450 | debug_gimple_stmt (stmt); | |
451 | } | |
452 | ||
b0cdf642 | 453 | /* Verify cgraph nodes of given cgraph node. */ |
4b987fac | 454 | DEBUG_FUNCTION void |
b0cdf642 | 455 | verify_cgraph_node (struct cgraph_node *node) |
456 | { | |
457 | struct cgraph_edge *e; | |
e27482aa | 458 | struct function *this_cfun = DECL_STRUCT_FUNCTION (node->decl); |
459 | basic_block this_block; | |
75a70cf9 | 460 | gimple_stmt_iterator gsi; |
9bfec7c2 | 461 | bool error_found = false; |
b0cdf642 | 462 | |
852f689e | 463 | if (seen_error ()) |
bd09cd3e | 464 | return; |
465 | ||
b0cdf642 | 466 | timevar_push (TV_CGRAPH_VERIFY); |
b0cdf642 | 467 | for (e = node->callees; e; e = e->next_callee) |
468 | if (e->aux) | |
469 | { | |
0a81f5a0 | 470 | error ("aux field set for edge %s->%s", |
abd3e6b5 | 471 | identifier_to_locale (cgraph_node_name (e->caller)), |
472 | identifier_to_locale (cgraph_node_name (e->callee))); | |
b0cdf642 | 473 | error_found = true; |
474 | } | |
a2cb9b3b | 475 | if (node->count < 0) |
476 | { | |
bf776685 | 477 | error ("execution count is negative"); |
a2cb9b3b | 478 | error_found = true; |
479 | } | |
59dd4830 | 480 | if (node->global.inlined_to && node->local.externally_visible) |
481 | { | |
bf776685 | 482 | error ("externally visible inline clone"); |
59dd4830 | 483 | error_found = true; |
484 | } | |
485 | if (node->global.inlined_to && node->address_taken) | |
486 | { | |
bf776685 | 487 | error ("inline clone with address taken"); |
59dd4830 | 488 | error_found = true; |
489 | } | |
490 | if (node->global.inlined_to && node->needed) | |
491 | { | |
bf776685 | 492 | error ("inline clone is needed"); |
59dd4830 | 493 | error_found = true; |
494 | } | |
799c8711 | 495 | for (e = node->indirect_calls; e; e = e->next_callee) |
496 | { | |
497 | if (e->aux) | |
498 | { | |
499 | error ("aux field set for indirect edge from %s", | |
500 | identifier_to_locale (cgraph_node_name (e->caller))); | |
501 | error_found = true; | |
502 | } | |
503 | if (!e->indirect_unknown_callee | |
504 | || !e->indirect_info) | |
505 | { | |
506 | error ("An indirect edge from %s is not marked as indirect or has " | |
507 | "associated indirect_info, the corresponding statement is: ", | |
508 | identifier_to_locale (cgraph_node_name (e->caller))); | |
7b29dd2f | 509 | cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); |
799c8711 | 510 | error_found = true; |
511 | } | |
512 | } | |
b0cdf642 | 513 | for (e = node->callers; e; e = e->next_caller) |
514 | { | |
1a036a3b | 515 | if (verify_edge_count_and_frequency (e)) |
516 | error_found = true; | |
b0cdf642 | 517 | if (!e->inline_failed) |
518 | { | |
519 | if (node->global.inlined_to | |
520 | != (e->caller->global.inlined_to | |
521 | ? e->caller->global.inlined_to : e->caller)) | |
522 | { | |
0a81f5a0 | 523 | error ("inlined_to pointer is wrong"); |
b0cdf642 | 524 | error_found = true; |
525 | } | |
526 | if (node->callers->next_caller) | |
527 | { | |
0a81f5a0 | 528 | error ("multiple inline callers"); |
b0cdf642 | 529 | error_found = true; |
530 | } | |
531 | } | |
532 | else | |
533 | if (node->global.inlined_to) | |
534 | { | |
0a81f5a0 | 535 | error ("inlined_to pointer set for noninline callers"); |
b0cdf642 | 536 | error_found = true; |
537 | } | |
538 | } | |
1a036a3b | 539 | for (e = node->indirect_calls; e; e = e->next_callee) |
540 | if (verify_edge_count_and_frequency (e)) | |
541 | error_found = true; | |
b0cdf642 | 542 | if (!node->callers && node->global.inlined_to) |
543 | { | |
5cd75817 | 544 | error ("inlined_to pointer is set but no predecessors found"); |
b0cdf642 | 545 | error_found = true; |
546 | } | |
547 | if (node->global.inlined_to == node) | |
548 | { | |
0a81f5a0 | 549 | error ("inlined_to pointer refers to itself"); |
b0cdf642 | 550 | error_found = true; |
551 | } | |
552 | ||
0f6439b9 | 553 | if (!cgraph_node (node->decl)) |
b0cdf642 | 554 | { |
0f6439b9 | 555 | error ("node not found in cgraph_hash"); |
b0cdf642 | 556 | error_found = true; |
557 | } | |
a0c938f0 | 558 | |
ccf4ab6b | 559 | if (node->clone_of) |
560 | { | |
561 | struct cgraph_node *n; | |
562 | for (n = node->clone_of->clones; n; n = n->next_sibling_clone) | |
563 | if (n == node) | |
564 | break; | |
565 | if (!n) | |
566 | { | |
567 | error ("node has wrong clone_of"); | |
568 | error_found = true; | |
569 | } | |
570 | } | |
571 | if (node->clones) | |
572 | { | |
573 | struct cgraph_node *n; | |
574 | for (n = node->clones; n; n = n->next_sibling_clone) | |
575 | if (n->clone_of != node) | |
576 | break; | |
577 | if (n) | |
578 | { | |
579 | error ("node has wrong clone list"); | |
580 | error_found = true; | |
581 | } | |
582 | } | |
583 | if ((node->prev_sibling_clone || node->next_sibling_clone) && !node->clone_of) | |
584 | { | |
585 | error ("node is in clone list but it is not clone"); | |
586 | error_found = true; | |
587 | } | |
588 | if (!node->prev_sibling_clone && node->clone_of && node->clone_of->clones != node) | |
589 | { | |
590 | error ("node has wrong prev_clone pointer"); | |
591 | error_found = true; | |
592 | } | |
593 | if (node->prev_sibling_clone && node->prev_sibling_clone->next_sibling_clone != node) | |
594 | { | |
595 | error ("double linked list of clones corrupted"); | |
596 | error_found = true; | |
597 | } | |
c524ac5d | 598 | if (node->same_comdat_group) |
599 | { | |
600 | struct cgraph_node *n = node->same_comdat_group; | |
601 | ||
602 | if (!DECL_ONE_ONLY (node->decl)) | |
603 | { | |
604 | error ("non-DECL_ONE_ONLY node in a same_comdat_group list"); | |
605 | error_found = true; | |
606 | } | |
607 | if (n == node) | |
608 | { | |
609 | error ("node is alone in a comdat group"); | |
610 | error_found = true; | |
611 | } | |
612 | do | |
613 | { | |
614 | if (!n->same_comdat_group) | |
615 | { | |
616 | error ("same_comdat_group is not a circular list"); | |
617 | error_found = true; | |
618 | break; | |
619 | } | |
620 | n = n->same_comdat_group; | |
621 | } | |
622 | while (n != node); | |
623 | } | |
ccf4ab6b | 624 | |
625 | if (node->analyzed && gimple_has_body_p (node->decl) | |
75a70cf9 | 626 | && !TREE_ASM_WRITTEN (node->decl) |
7bfefa9d | 627 | && (!DECL_EXTERNAL (node->decl) || node->global.inlined_to) |
628 | && !flag_wpa) | |
b0cdf642 | 629 | { |
e27482aa | 630 | if (this_cfun->cfg) |
631 | { | |
632 | /* The nodes we're interested in are never shared, so walk | |
633 | the tree ignoring duplicates. */ | |
e7c352d1 | 634 | struct pointer_set_t *visited_nodes = pointer_set_create (); |
e27482aa | 635 | /* Reach the trees by walking over the CFG, and note the |
636 | enclosing basic-blocks in the call edges. */ | |
637 | FOR_EACH_BB_FN (this_block, this_cfun) | |
75a70cf9 | 638 | for (gsi = gsi_start_bb (this_block); |
639 | !gsi_end_p (gsi); | |
640 | gsi_next (&gsi)) | |
9bfec7c2 | 641 | { |
75a70cf9 | 642 | gimple stmt = gsi_stmt (gsi); |
799c8711 | 643 | if (is_gimple_call (stmt)) |
9bfec7c2 | 644 | { |
645 | struct cgraph_edge *e = cgraph_edge (node, stmt); | |
799c8711 | 646 | tree decl = gimple_call_fndecl (stmt); |
9bfec7c2 | 647 | if (e) |
648 | { | |
649 | if (e->aux) | |
650 | { | |
0a81f5a0 | 651 | error ("shared call_stmt:"); |
7b29dd2f | 652 | cgraph_debug_gimple_stmt (this_cfun, stmt); |
9bfec7c2 | 653 | error_found = true; |
654 | } | |
799c8711 | 655 | if (!e->indirect_unknown_callee) |
28454517 | 656 | { |
76f3f3ab | 657 | struct cgraph_node *n; |
658 | ||
799c8711 | 659 | if (e->callee->same_body_alias) |
660 | { | |
661 | error ("edge points to same body alias:"); | |
662 | debug_tree (e->callee->decl); | |
663 | error_found = true; | |
664 | } | |
e748b31d | 665 | else if (!e->callee->global.inlined_to |
799c8711 | 666 | && decl |
e748b31d | 667 | && cgraph_get_node (decl) |
668 | && (e->callee->former_clone_of | |
669 | != cgraph_get_node (decl)->decl) | |
799c8711 | 670 | && !clone_of_p (cgraph_node (decl), |
671 | e->callee)) | |
672 | { | |
673 | error ("edge points to wrong declaration:"); | |
674 | debug_tree (e->callee->decl); | |
675 | fprintf (stderr," Instead of:"); | |
676 | debug_tree (decl); | |
677 | error_found = true; | |
678 | } | |
76f3f3ab | 679 | else if (decl |
680 | && (n = cgraph_get_node_or_alias (decl)) | |
681 | && (n->same_body_alias | |
682 | && n->thunk.thunk_p)) | |
683 | { | |
684 | error ("a call to thunk improperly represented " | |
685 | "in the call graph:"); | |
7b29dd2f | 686 | cgraph_debug_gimple_stmt (this_cfun, stmt); |
687 | error_found = true; | |
76f3f3ab | 688 | } |
28454517 | 689 | } |
799c8711 | 690 | else if (decl) |
9bfec7c2 | 691 | { |
799c8711 | 692 | error ("an indirect edge with unknown callee " |
693 | "corresponding to a call_stmt with " | |
694 | "a known declaration:"); | |
ee3f5fc0 | 695 | error_found = true; |
7b29dd2f | 696 | cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); |
9bfec7c2 | 697 | } |
698 | e->aux = (void *)1; | |
699 | } | |
799c8711 | 700 | else if (decl) |
9bfec7c2 | 701 | { |
0a81f5a0 | 702 | error ("missing callgraph edge for call stmt:"); |
7b29dd2f | 703 | cgraph_debug_gimple_stmt (this_cfun, stmt); |
9bfec7c2 | 704 | error_found = true; |
705 | } | |
706 | } | |
707 | } | |
e27482aa | 708 | pointer_set_destroy (visited_nodes); |
e27482aa | 709 | } |
710 | else | |
711 | /* No CFG available?! */ | |
712 | gcc_unreachable (); | |
713 | ||
b0cdf642 | 714 | for (e = node->callees; e; e = e->next_callee) |
715 | { | |
799c8711 | 716 | if (!e->aux) |
b0cdf642 | 717 | { |
0a81f5a0 | 718 | error ("edge %s->%s has no corresponding call_stmt", |
abd3e6b5 | 719 | identifier_to_locale (cgraph_node_name (e->caller)), |
720 | identifier_to_locale (cgraph_node_name (e->callee))); | |
7b29dd2f | 721 | cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); |
b0cdf642 | 722 | error_found = true; |
723 | } | |
724 | e->aux = 0; | |
725 | } | |
799c8711 | 726 | for (e = node->indirect_calls; e; e = e->next_callee) |
727 | { | |
728 | if (!e->aux) | |
729 | { | |
730 | error ("an indirect edge from %s has no corresponding call_stmt", | |
731 | identifier_to_locale (cgraph_node_name (e->caller))); | |
7b29dd2f | 732 | cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); |
799c8711 | 733 | error_found = true; |
734 | } | |
735 | e->aux = 0; | |
736 | } | |
b0cdf642 | 737 | } |
738 | if (error_found) | |
739 | { | |
740 | dump_cgraph_node (stderr, node); | |
0a81f5a0 | 741 | internal_error ("verify_cgraph_node failed"); |
b0cdf642 | 742 | } |
743 | timevar_pop (TV_CGRAPH_VERIFY); | |
744 | } | |
745 | ||
746 | /* Verify whole cgraph structure. */ | |
4b987fac | 747 | DEBUG_FUNCTION void |
b0cdf642 | 748 | verify_cgraph (void) |
749 | { | |
750 | struct cgraph_node *node; | |
751 | ||
852f689e | 752 | if (seen_error ()) |
8ec2a798 | 753 | return; |
754 | ||
b0cdf642 | 755 | for (node = cgraph_nodes; node; node = node->next) |
756 | verify_cgraph_node (node); | |
757 | } | |
758 | ||
56af936e | 759 | /* Output all asm statements we have stored up to be output. */ |
760 | ||
761 | static void | |
762 | cgraph_output_pending_asms (void) | |
763 | { | |
764 | struct cgraph_asm_node *can; | |
765 | ||
852f689e | 766 | if (seen_error ()) |
56af936e | 767 | return; |
768 | ||
769 | for (can = cgraph_asm_nodes; can; can = can->next) | |
770 | assemble_asm (can->asm_str); | |
771 | cgraph_asm_nodes = NULL; | |
772 | } | |
773 | ||
0785e435 | 774 | /* Analyze the function scheduled to be output. */ |
bfec3452 | 775 | static void |
0785e435 | 776 | cgraph_analyze_function (struct cgraph_node *node) |
777 | { | |
bfec3452 | 778 | tree save = current_function_decl; |
0785e435 | 779 | tree decl = node->decl; |
780 | ||
ec1e35b2 | 781 | current_function_decl = decl; |
e27482aa | 782 | push_cfun (DECL_STRUCT_FUNCTION (decl)); |
bfec3452 | 783 | |
6816d0c4 | 784 | assign_assembler_name_if_neeeded (node->decl); |
785 | ||
bfec3452 | 786 | /* Make sure to gimplify bodies only once. During analyzing a |
787 | function we lower it, which will require gimplified nested | |
788 | functions, so we can end up here with an already gimplified | |
789 | body. */ | |
790 | if (!gimple_body (decl)) | |
791 | gimplify_function_tree (decl); | |
792 | dump_function (TDI_generic, decl); | |
793 | ||
e27482aa | 794 | cgraph_lower_function (node); |
6e8d6e86 | 795 | node->analyzed = true; |
0785e435 | 796 | |
e27482aa | 797 | pop_cfun (); |
bfec3452 | 798 | current_function_decl = save; |
0785e435 | 799 | } |
800 | ||
d05db70d | 801 | /* Process attributes common for vars and functions. */ |
802 | ||
803 | static void | |
804 | process_common_attributes (tree decl) | |
805 | { | |
806 | tree weakref = lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)); | |
807 | ||
808 | if (weakref && !lookup_attribute ("alias", DECL_ATTRIBUTES (decl))) | |
809 | { | |
810 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
811 | "%<weakref%> attribute should be accompanied with" | |
812 | " an %<alias%> attribute"); | |
813 | DECL_WEAK (decl) = 0; | |
40b32d93 | 814 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", |
815 | DECL_ATTRIBUTES (decl)); | |
d05db70d | 816 | } |
817 | } | |
818 | ||
05806473 | 819 | /* Look for externally_visible and used attributes and mark cgraph nodes |
820 | accordingly. | |
821 | ||
822 | We cannot mark the nodes at the point the attributes are processed (in | |
823 | handle_*_attribute) because the copy of the declarations available at that | |
824 | point may not be canonical. For example, in: | |
825 | ||
826 | void f(); | |
827 | void f() __attribute__((used)); | |
828 | ||
829 | the declaration we see in handle_used_attribute will be the second | |
830 | declaration -- but the front end will subsequently merge that declaration | |
831 | with the original declaration and discard the second declaration. | |
832 | ||
833 | Furthermore, we can't mark these nodes in cgraph_finalize_function because: | |
834 | ||
835 | void f() {} | |
836 | void f() __attribute__((externally_visible)); | |
837 | ||
838 | is valid. | |
839 | ||
840 | So, we walk the nodes at the end of the translation unit, applying the | |
841 | attributes at that point. */ | |
842 | ||
843 | static void | |
844 | process_function_and_variable_attributes (struct cgraph_node *first, | |
1d416bd7 | 845 | struct varpool_node *first_var) |
05806473 | 846 | { |
847 | struct cgraph_node *node; | |
1d416bd7 | 848 | struct varpool_node *vnode; |
05806473 | 849 | |
850 | for (node = cgraph_nodes; node != first; node = node->next) | |
851 | { | |
852 | tree decl = node->decl; | |
83a23b05 | 853 | if (DECL_PRESERVE_P (decl)) |
0b49f8f8 | 854 | cgraph_mark_needed_node (node); |
62433d51 | 855 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES |
856 | && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)) | |
857 | && TREE_PUBLIC (node->decl)) | |
858 | { | |
859 | if (node->local.finalized) | |
860 | cgraph_mark_needed_node (node); | |
861 | } | |
862 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) | |
05806473 | 863 | { |
ba12ea31 | 864 | if (! TREE_PUBLIC (node->decl)) |
712d2297 | 865 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, |
866 | "%<externally_visible%>" | |
867 | " attribute have effect only on public objects"); | |
59dd4830 | 868 | else if (node->local.finalized) |
869 | cgraph_mark_needed_node (node); | |
05806473 | 870 | } |
40b32d93 | 871 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
872 | && node->local.finalized) | |
873 | { | |
874 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, | |
875 | "%<weakref%> attribute ignored" | |
876 | " because function is defined"); | |
877 | DECL_WEAK (decl) = 0; | |
878 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
879 | DECL_ATTRIBUTES (decl)); | |
880 | } | |
d05db70d | 881 | process_common_attributes (decl); |
05806473 | 882 | } |
1d416bd7 | 883 | for (vnode = varpool_nodes; vnode != first_var; vnode = vnode->next) |
05806473 | 884 | { |
885 | tree decl = vnode->decl; | |
83a23b05 | 886 | if (DECL_PRESERVE_P (decl)) |
05806473 | 887 | { |
22671757 | 888 | vnode->force_output = true; |
05806473 | 889 | if (vnode->finalized) |
1d416bd7 | 890 | varpool_mark_needed_node (vnode); |
05806473 | 891 | } |
62433d51 | 892 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES |
893 | && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)) | |
0d9d5d69 | 894 | && TREE_PUBLIC (vnode->decl)) |
62433d51 | 895 | { |
896 | if (vnode->finalized) | |
897 | varpool_mark_needed_node (vnode); | |
898 | } | |
899 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) | |
05806473 | 900 | { |
ba12ea31 | 901 | if (! TREE_PUBLIC (vnode->decl)) |
712d2297 | 902 | warning_at (DECL_SOURCE_LOCATION (vnode->decl), OPT_Wattributes, |
903 | "%<externally_visible%>" | |
904 | " attribute have effect only on public objects"); | |
59dd4830 | 905 | else if (vnode->finalized) |
906 | varpool_mark_needed_node (vnode); | |
05806473 | 907 | } |
40b32d93 | 908 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
909 | && vnode->finalized | |
910 | && DECL_INITIAL (decl)) | |
911 | { | |
912 | warning_at (DECL_SOURCE_LOCATION (vnode->decl), OPT_Wattributes, | |
913 | "%<weakref%> attribute ignored" | |
914 | " because variable is initialized"); | |
915 | DECL_WEAK (decl) = 0; | |
916 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
917 | DECL_ATTRIBUTES (decl)); | |
918 | } | |
d05db70d | 919 | process_common_attributes (decl); |
05806473 | 920 | } |
921 | } | |
922 | ||
aeeb194b | 923 | /* Process CGRAPH_NODES_NEEDED queue, analyze each function (and transitively |
924 | each reachable functions) and build cgraph. | |
925 | The function can be called multiple times after inserting new nodes | |
0d424440 | 926 | into beginning of queue. Just the new part of queue is re-scanned then. */ |
ae01b312 | 927 | |
aeeb194b | 928 | static void |
929 | cgraph_analyze_functions (void) | |
ae01b312 | 930 | { |
c1dcd13c | 931 | /* Keep track of already processed nodes when called multiple times for |
06b27565 | 932 | intermodule optimization. */ |
c1dcd13c | 933 | static struct cgraph_node *first_analyzed; |
c17d0de1 | 934 | struct cgraph_node *first_processed = first_analyzed; |
1d416bd7 | 935 | static struct varpool_node *first_analyzed_var; |
aeeb194b | 936 | struct cgraph_node *node, *next; |
ae01b312 | 937 | |
f1c35659 | 938 | bitmap_obstack_initialize (NULL); |
c17d0de1 | 939 | process_function_and_variable_attributes (first_processed, |
940 | first_analyzed_var); | |
941 | first_processed = cgraph_nodes; | |
1d416bd7 | 942 | first_analyzed_var = varpool_nodes; |
943 | varpool_analyze_pending_decls (); | |
f79b6507 | 944 | if (cgraph_dump_file) |
ae01b312 | 945 | { |
e4200070 | 946 | fprintf (cgraph_dump_file, "Initial entry points:"); |
c1dcd13c | 947 | for (node = cgraph_nodes; node != first_analyzed; node = node->next) |
1a1a827a | 948 | if (node->needed) |
f79b6507 | 949 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); |
950 | fprintf (cgraph_dump_file, "\n"); | |
ae01b312 | 951 | } |
aeeb194b | 952 | cgraph_process_new_functions (); |
ae01b312 | 953 | |
e6d2b2d8 | 954 | /* Propagate reachability flag and lower representation of all reachable |
955 | functions. In the future, lowering will introduce new functions and | |
956 | new entry points on the way (by template instantiation and virtual | |
957 | method table generation for instance). */ | |
3d7bfc56 | 958 | while (cgraph_nodes_queue) |
ae01b312 | 959 | { |
0785e435 | 960 | struct cgraph_edge *edge; |
3d7bfc56 | 961 | tree decl = cgraph_nodes_queue->decl; |
962 | ||
963 | node = cgraph_nodes_queue; | |
d87976fb | 964 | cgraph_nodes_queue = cgraph_nodes_queue->next_needed; |
b0cdf642 | 965 | node->next_needed = NULL; |
ae01b312 | 966 | |
638531ad | 967 | /* ??? It is possible to create extern inline function and later using |
bbd5cba2 | 968 | weak alias attribute to kill its body. See |
638531ad | 969 | gcc.c-torture/compile/20011119-1.c */ |
75a70cf9 | 970 | if (!DECL_STRUCT_FUNCTION (decl)) |
9b8fb23a | 971 | { |
972 | cgraph_reset_node (node); | |
973 | continue; | |
974 | } | |
638531ad | 975 | |
7bfefa9d | 976 | if (!node->analyzed) |
977 | cgraph_analyze_function (node); | |
2c0b522d | 978 | |
ae01b312 | 979 | for (edge = node->callees; edge; edge = edge->next_callee) |
0785e435 | 980 | if (!edge->callee->reachable) |
2c0b522d | 981 | cgraph_mark_reachable_node (edge->callee); |
982 | ||
61c2c7b1 | 983 | if (node->same_comdat_group) |
984 | { | |
985 | for (next = node->same_comdat_group; | |
986 | next != node; | |
987 | next = next->same_comdat_group) | |
988 | cgraph_mark_reachable_node (next); | |
989 | } | |
990 | ||
d544ceff | 991 | /* If decl is a clone of an abstract function, mark that abstract |
992 | function so that we don't release its body. The DECL_INITIAL() of that | |
993 | abstract function declaration will be later needed to output debug info. */ | |
994 | if (DECL_ABSTRACT_ORIGIN (decl)) | |
995 | { | |
996 | struct cgraph_node *origin_node = cgraph_node (DECL_ABSTRACT_ORIGIN (decl)); | |
997 | origin_node->abstract_and_needed = true; | |
998 | } | |
999 | ||
c17d0de1 | 1000 | /* We finalize local static variables during constructing callgraph |
1001 | edges. Process their attributes too. */ | |
1002 | process_function_and_variable_attributes (first_processed, | |
1003 | first_analyzed_var); | |
1004 | first_processed = cgraph_nodes; | |
1d416bd7 | 1005 | first_analyzed_var = varpool_nodes; |
1006 | varpool_analyze_pending_decls (); | |
aeeb194b | 1007 | cgraph_process_new_functions (); |
ae01b312 | 1008 | } |
2c0b522d | 1009 | |
aa5e06c7 | 1010 | /* Collect entry points to the unit. */ |
f79b6507 | 1011 | if (cgraph_dump_file) |
3d7bfc56 | 1012 | { |
e4200070 | 1013 | fprintf (cgraph_dump_file, "Unit entry points:"); |
c1dcd13c | 1014 | for (node = cgraph_nodes; node != first_analyzed; node = node->next) |
1a1a827a | 1015 | if (node->needed) |
f79b6507 | 1016 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); |
e4200070 | 1017 | fprintf (cgraph_dump_file, "\n\nInitial "); |
0785e435 | 1018 | dump_cgraph (cgraph_dump_file); |
7410370b | 1019 | dump_varpool (cgraph_dump_file); |
3d7bfc56 | 1020 | } |
e6d2b2d8 | 1021 | |
f79b6507 | 1022 | if (cgraph_dump_file) |
1023 | fprintf (cgraph_dump_file, "\nReclaiming functions:"); | |
ae01b312 | 1024 | |
f4ec5ce1 | 1025 | for (node = cgraph_nodes; node != first_analyzed; node = next) |
ae01b312 | 1026 | { |
1027 | tree decl = node->decl; | |
f4ec5ce1 | 1028 | next = node->next; |
ae01b312 | 1029 | |
1a1a827a | 1030 | if (node->local.finalized && !gimple_has_body_p (decl)) |
a0c938f0 | 1031 | cgraph_reset_node (node); |
9b8fb23a | 1032 | |
1a1a827a | 1033 | if (!node->reachable && gimple_has_body_p (decl)) |
ae01b312 | 1034 | { |
f79b6507 | 1035 | if (cgraph_dump_file) |
1036 | fprintf (cgraph_dump_file, " %s", cgraph_node_name (node)); | |
b0cdf642 | 1037 | cgraph_remove_node (node); |
9b8fb23a | 1038 | continue; |
ae01b312 | 1039 | } |
bc5cab3b | 1040 | else |
1041 | node->next_needed = NULL; | |
1a1a827a | 1042 | gcc_assert (!node->local.finalized || gimple_has_body_p (decl)); |
9b8fb23a | 1043 | gcc_assert (node->analyzed == node->local.finalized); |
ae01b312 | 1044 | } |
f79b6507 | 1045 | if (cgraph_dump_file) |
e4200070 | 1046 | { |
1047 | fprintf (cgraph_dump_file, "\n\nReclaimed "); | |
1048 | dump_cgraph (cgraph_dump_file); | |
7410370b | 1049 | dump_varpool (cgraph_dump_file); |
e4200070 | 1050 | } |
f1c35659 | 1051 | bitmap_obstack_release (NULL); |
c1dcd13c | 1052 | first_analyzed = cgraph_nodes; |
ae01b312 | 1053 | ggc_collect (); |
aeeb194b | 1054 | } |
1055 | ||
8f69fd82 | 1056 | |
aeeb194b | 1057 | /* Analyze the whole compilation unit once it is parsed completely. */ |
1058 | ||
1059 | void | |
1060 | cgraph_finalize_compilation_unit (void) | |
1061 | { | |
9929334e | 1062 | timevar_push (TV_CGRAPH); |
1063 | ||
bfec3452 | 1064 | /* Do not skip analyzing the functions if there were errors, we |
1065 | miss diagnostics for following functions otherwise. */ | |
aeeb194b | 1066 | |
8f69fd82 | 1067 | /* Emit size functions we didn't inline. */ |
4189e677 | 1068 | finalize_size_functions (); |
8f69fd82 | 1069 | |
9929334e | 1070 | /* Mark alias targets necessary and emit diagnostics. */ |
1071 | finish_aliases_1 (); | |
1072 | ||
aeeb194b | 1073 | if (!quiet_flag) |
1074 | { | |
1075 | fprintf (stderr, "\nAnalyzing compilation unit\n"); | |
1076 | fflush (stderr); | |
1077 | } | |
1078 | ||
9929334e | 1079 | /* Gimplify and lower all functions, compute reachability and |
1080 | remove unreachable nodes. */ | |
1081 | cgraph_analyze_functions (); | |
1082 | ||
8f69fd82 | 1083 | /* Mark alias targets necessary and emit diagnostics. */ |
1084 | finish_aliases_1 (); | |
1085 | ||
9929334e | 1086 | /* Gimplify and lower thunks. */ |
aeeb194b | 1087 | cgraph_analyze_functions (); |
bfec3452 | 1088 | |
9929334e | 1089 | /* Finally drive the pass manager. */ |
bfec3452 | 1090 | cgraph_optimize (); |
9929334e | 1091 | |
1092 | timevar_pop (TV_CGRAPH); | |
ae01b312 | 1093 | } |
9ed5b1f5 | 1094 | |
1095 | ||
ae01b312 | 1096 | /* Figure out what functions we want to assemble. */ |
1097 | ||
1098 | static void | |
d9d9733a | 1099 | cgraph_mark_functions_to_output (void) |
ae01b312 | 1100 | { |
1101 | struct cgraph_node *node; | |
61c2c7b1 | 1102 | #ifdef ENABLE_CHECKING |
1103 | bool check_same_comdat_groups = false; | |
1104 | ||
1105 | for (node = cgraph_nodes; node; node = node->next) | |
1106 | gcc_assert (!node->process); | |
1107 | #endif | |
ae01b312 | 1108 | |
ae01b312 | 1109 | for (node = cgraph_nodes; node; node = node->next) |
1110 | { | |
1111 | tree decl = node->decl; | |
d7c6d889 | 1112 | struct cgraph_edge *e; |
a0c938f0 | 1113 | |
61c2c7b1 | 1114 | gcc_assert (!node->process || node->same_comdat_group); |
1115 | if (node->process) | |
1116 | continue; | |
d7c6d889 | 1117 | |
1118 | for (e = node->callers; e; e = e->next_caller) | |
611e5405 | 1119 | if (e->inline_failed) |
d7c6d889 | 1120 | break; |
ae01b312 | 1121 | |
e6d2b2d8 | 1122 | /* We need to output all local functions that are used and not |
1123 | always inlined, as well as those that are reachable from | |
1124 | outside the current compilation unit. */ | |
1a1a827a | 1125 | if (node->analyzed |
b0cdf642 | 1126 | && !node->global.inlined_to |
1e3aebec | 1127 | && (!cgraph_only_called_directly_p (node) |
d7c6d889 | 1128 | || (e && node->reachable)) |
4ee9c684 | 1129 | && !TREE_ASM_WRITTEN (decl) |
ae01b312 | 1130 | && !DECL_EXTERNAL (decl)) |
61c2c7b1 | 1131 | { |
1132 | node->process = 1; | |
1133 | if (node->same_comdat_group) | |
1134 | { | |
1135 | struct cgraph_node *next; | |
1136 | for (next = node->same_comdat_group; | |
1137 | next != node; | |
1138 | next = next->same_comdat_group) | |
1139 | next->process = 1; | |
1140 | } | |
1141 | } | |
1142 | else if (node->same_comdat_group) | |
1143 | { | |
1144 | #ifdef ENABLE_CHECKING | |
1145 | check_same_comdat_groups = true; | |
1146 | #endif | |
1147 | } | |
cc636d56 | 1148 | else |
9cee7c3f | 1149 | { |
1150 | /* We should've reclaimed all functions that are not needed. */ | |
1151 | #ifdef ENABLE_CHECKING | |
75a70cf9 | 1152 | if (!node->global.inlined_to |
1a1a827a | 1153 | && gimple_has_body_p (decl) |
08843223 | 1154 | /* FIXME: in ltrans unit when offline copy is outside partition but inline copies |
1155 | are inside partition, we can end up not removing the body since we no longer | |
1156 | have analyzed node pointing to it. */ | |
1157 | && !node->in_other_partition | |
9cee7c3f | 1158 | && !DECL_EXTERNAL (decl)) |
1159 | { | |
1160 | dump_cgraph_node (stderr, node); | |
1161 | internal_error ("failed to reclaim unneeded function"); | |
1162 | } | |
1163 | #endif | |
75a70cf9 | 1164 | gcc_assert (node->global.inlined_to |
1a1a827a | 1165 | || !gimple_has_body_p (decl) |
08843223 | 1166 | || node->in_other_partition |
9cee7c3f | 1167 | || DECL_EXTERNAL (decl)); |
1168 | ||
1169 | } | |
a0c938f0 | 1170 | |
961e3b13 | 1171 | } |
61c2c7b1 | 1172 | #ifdef ENABLE_CHECKING |
1173 | if (check_same_comdat_groups) | |
1174 | for (node = cgraph_nodes; node; node = node->next) | |
1175 | if (node->same_comdat_group && !node->process) | |
1176 | { | |
1177 | tree decl = node->decl; | |
1178 | if (!node->global.inlined_to | |
1179 | && gimple_has_body_p (decl) | |
08843223 | 1180 | /* FIXME: in ltrans unit when offline copy is outside partition but inline copies |
1181 | are inside partition, we can end up not removing the body since we no longer | |
1182 | have analyzed node pointing to it. */ | |
1183 | && !node->in_other_partition | |
61c2c7b1 | 1184 | && !DECL_EXTERNAL (decl)) |
1185 | { | |
1186 | dump_cgraph_node (stderr, node); | |
1187 | internal_error ("failed to reclaim unneeded function"); | |
1188 | } | |
1189 | } | |
1190 | #endif | |
961e3b13 | 1191 | } |
1192 | ||
28454517 | 1193 | /* DECL is FUNCTION_DECL. Initialize datastructures so DECL is a function |
1194 | in lowered gimple form. | |
1195 | ||
1196 | Set current_function_decl and cfun to newly constructed empty function body. | |
1197 | return basic block in the function body. */ | |
1198 | ||
1199 | static basic_block | |
1200 | init_lowered_empty_function (tree decl) | |
1201 | { | |
1202 | basic_block bb; | |
1203 | ||
1204 | current_function_decl = decl; | |
1205 | allocate_struct_function (decl, false); | |
1206 | gimple_register_cfg_hooks (); | |
1207 | init_empty_tree_cfg (); | |
1208 | init_tree_ssa (cfun); | |
1209 | init_ssa_operands (); | |
1210 | cfun->gimple_df->in_ssa_p = true; | |
1211 | DECL_INITIAL (decl) = make_node (BLOCK); | |
1212 | ||
1213 | DECL_SAVED_TREE (decl) = error_mark_node; | |
1214 | cfun->curr_properties |= | |
1215 | (PROP_gimple_lcf | PROP_gimple_leh | PROP_cfg | PROP_referenced_vars | | |
1216 | PROP_ssa); | |
1217 | ||
1218 | /* Create BB for body of the function and connect it properly. */ | |
1219 | bb = create_basic_block (NULL, (void *) 0, ENTRY_BLOCK_PTR); | |
1220 | make_edge (ENTRY_BLOCK_PTR, bb, 0); | |
1221 | make_edge (bb, EXIT_BLOCK_PTR, 0); | |
1222 | ||
1223 | return bb; | |
1224 | } | |
1225 | ||
1226 | /* Adjust PTR by the constant FIXED_OFFSET, and by the vtable | |
1227 | offset indicated by VIRTUAL_OFFSET, if that is | |
1228 | non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and | |
1229 | zero for a result adjusting thunk. */ | |
1230 | ||
1231 | static tree | |
1232 | thunk_adjust (gimple_stmt_iterator * bsi, | |
1233 | tree ptr, bool this_adjusting, | |
1234 | HOST_WIDE_INT fixed_offset, tree virtual_offset) | |
1235 | { | |
1236 | gimple stmt; | |
1237 | tree ret; | |
1238 | ||
55d6cb23 | 1239 | if (this_adjusting |
1240 | && fixed_offset != 0) | |
28454517 | 1241 | { |
1242 | stmt = gimple_build_assign (ptr, | |
1243 | fold_build2_loc (input_location, | |
1244 | POINTER_PLUS_EXPR, | |
1245 | TREE_TYPE (ptr), ptr, | |
1246 | size_int (fixed_offset))); | |
1247 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1248 | } | |
1249 | ||
1250 | /* If there's a virtual offset, look up that value in the vtable and | |
1251 | adjust the pointer again. */ | |
1252 | if (virtual_offset) | |
1253 | { | |
1254 | tree vtabletmp; | |
1255 | tree vtabletmp2; | |
1256 | tree vtabletmp3; | |
1257 | tree offsettmp; | |
1258 | ||
1259 | if (!vtable_entry_type) | |
1260 | { | |
1261 | tree vfunc_type = make_node (FUNCTION_TYPE); | |
1262 | TREE_TYPE (vfunc_type) = integer_type_node; | |
1263 | TYPE_ARG_TYPES (vfunc_type) = NULL_TREE; | |
1264 | layout_type (vfunc_type); | |
1265 | ||
1266 | vtable_entry_type = build_pointer_type (vfunc_type); | |
1267 | } | |
1268 | ||
1269 | vtabletmp = | |
1270 | create_tmp_var (build_pointer_type | |
1271 | (build_pointer_type (vtable_entry_type)), "vptr"); | |
1272 | ||
1273 | /* The vptr is always at offset zero in the object. */ | |
1274 | stmt = gimple_build_assign (vtabletmp, | |
1275 | build1 (NOP_EXPR, TREE_TYPE (vtabletmp), | |
1276 | ptr)); | |
1277 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1278 | mark_symbols_for_renaming (stmt); | |
1279 | find_referenced_vars_in (stmt); | |
1280 | ||
1281 | /* Form the vtable address. */ | |
1282 | vtabletmp2 = create_tmp_var (TREE_TYPE (TREE_TYPE (vtabletmp)), | |
1283 | "vtableaddr"); | |
1284 | stmt = gimple_build_assign (vtabletmp2, | |
182cf5a9 | 1285 | build_simple_mem_ref (vtabletmp)); |
28454517 | 1286 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1287 | mark_symbols_for_renaming (stmt); | |
1288 | find_referenced_vars_in (stmt); | |
1289 | ||
1290 | /* Find the entry with the vcall offset. */ | |
1291 | stmt = gimple_build_assign (vtabletmp2, | |
1292 | fold_build2_loc (input_location, | |
1293 | POINTER_PLUS_EXPR, | |
1294 | TREE_TYPE (vtabletmp2), | |
1295 | vtabletmp2, | |
1296 | fold_convert (sizetype, | |
1297 | virtual_offset))); | |
1298 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1299 | ||
1300 | /* Get the offset itself. */ | |
1301 | vtabletmp3 = create_tmp_var (TREE_TYPE (TREE_TYPE (vtabletmp2)), | |
1302 | "vcalloffset"); | |
1303 | stmt = gimple_build_assign (vtabletmp3, | |
182cf5a9 | 1304 | build_simple_mem_ref (vtabletmp2)); |
28454517 | 1305 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1306 | mark_symbols_for_renaming (stmt); | |
1307 | find_referenced_vars_in (stmt); | |
1308 | ||
1309 | /* Cast to sizetype. */ | |
1310 | offsettmp = create_tmp_var (sizetype, "offset"); | |
1311 | stmt = gimple_build_assign (offsettmp, fold_convert (sizetype, vtabletmp3)); | |
1312 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1313 | mark_symbols_for_renaming (stmt); | |
1314 | find_referenced_vars_in (stmt); | |
1315 | ||
1316 | /* Adjust the `this' pointer. */ | |
1317 | ptr = fold_build2_loc (input_location, | |
1318 | POINTER_PLUS_EXPR, TREE_TYPE (ptr), ptr, | |
1319 | offsettmp); | |
1320 | } | |
1321 | ||
55d6cb23 | 1322 | if (!this_adjusting |
1323 | && fixed_offset != 0) | |
28454517 | 1324 | /* Adjust the pointer by the constant. */ |
1325 | { | |
1326 | tree ptrtmp; | |
1327 | ||
1328 | if (TREE_CODE (ptr) == VAR_DECL) | |
1329 | ptrtmp = ptr; | |
1330 | else | |
1331 | { | |
1332 | ptrtmp = create_tmp_var (TREE_TYPE (ptr), "ptr"); | |
1333 | stmt = gimple_build_assign (ptrtmp, ptr); | |
1334 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1335 | mark_symbols_for_renaming (stmt); | |
1336 | find_referenced_vars_in (stmt); | |
1337 | } | |
1338 | ptr = fold_build2_loc (input_location, | |
1339 | POINTER_PLUS_EXPR, TREE_TYPE (ptrtmp), ptrtmp, | |
1340 | size_int (fixed_offset)); | |
1341 | } | |
1342 | ||
1343 | /* Emit the statement and gimplify the adjustment expression. */ | |
1344 | ret = create_tmp_var (TREE_TYPE (ptr), "adjusted_this"); | |
1345 | stmt = gimple_build_assign (ret, ptr); | |
1346 | mark_symbols_for_renaming (stmt); | |
1347 | find_referenced_vars_in (stmt); | |
1348 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1349 | ||
1350 | return ret; | |
1351 | } | |
1352 | ||
1353 | /* Produce assembler for thunk NODE. */ | |
1354 | ||
1355 | static void | |
1356 | assemble_thunk (struct cgraph_node *node) | |
1357 | { | |
1358 | bool this_adjusting = node->thunk.this_adjusting; | |
1359 | HOST_WIDE_INT fixed_offset = node->thunk.fixed_offset; | |
1360 | HOST_WIDE_INT virtual_value = node->thunk.virtual_value; | |
1361 | tree virtual_offset = NULL; | |
1362 | tree alias = node->thunk.alias; | |
1363 | tree thunk_fndecl = node->decl; | |
1364 | tree a = DECL_ARGUMENTS (thunk_fndecl); | |
1365 | ||
1366 | current_function_decl = thunk_fndecl; | |
1367 | ||
aed6e608 | 1368 | /* Ensure thunks are emitted in their correct sections. */ |
1369 | resolve_unique_section (thunk_fndecl, 0, flag_function_sections); | |
1370 | ||
28454517 | 1371 | if (this_adjusting |
1372 | && targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset, | |
1373 | virtual_value, alias)) | |
1374 | { | |
1375 | const char *fnname; | |
1376 | tree fn_block; | |
1377 | ||
1378 | DECL_RESULT (thunk_fndecl) | |
1379 | = build_decl (DECL_SOURCE_LOCATION (thunk_fndecl), | |
1380 | RESULT_DECL, 0, integer_type_node); | |
22ea3b47 | 1381 | fnname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk_fndecl)); |
28454517 | 1382 | |
1383 | /* The back end expects DECL_INITIAL to contain a BLOCK, so we | |
1384 | create one. */ | |
1385 | fn_block = make_node (BLOCK); | |
1386 | BLOCK_VARS (fn_block) = a; | |
1387 | DECL_INITIAL (thunk_fndecl) = fn_block; | |
1388 | init_function_start (thunk_fndecl); | |
1389 | cfun->is_thunk = 1; | |
1390 | assemble_start_function (thunk_fndecl, fnname); | |
1391 | ||
1392 | targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl, | |
1393 | fixed_offset, virtual_value, alias); | |
1394 | ||
1395 | assemble_end_function (thunk_fndecl, fnname); | |
1396 | init_insn_lengths (); | |
1397 | free_after_compilation (cfun); | |
1398 | set_cfun (NULL); | |
1399 | TREE_ASM_WRITTEN (thunk_fndecl) = 1; | |
1400 | } | |
1401 | else | |
1402 | { | |
1403 | tree restype; | |
1404 | basic_block bb, then_bb, else_bb, return_bb; | |
1405 | gimple_stmt_iterator bsi; | |
1406 | int nargs = 0; | |
1407 | tree arg; | |
1408 | int i; | |
1409 | tree resdecl; | |
1410 | tree restmp = NULL; | |
1411 | VEC(tree, heap) *vargs; | |
1412 | ||
1413 | gimple call; | |
1414 | gimple ret; | |
1415 | ||
1416 | DECL_IGNORED_P (thunk_fndecl) = 1; | |
1417 | bitmap_obstack_initialize (NULL); | |
1418 | ||
1419 | if (node->thunk.virtual_offset_p) | |
1420 | virtual_offset = size_int (virtual_value); | |
1421 | ||
1422 | /* Build the return declaration for the function. */ | |
1423 | restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); | |
1424 | if (DECL_RESULT (thunk_fndecl) == NULL_TREE) | |
1425 | { | |
1426 | resdecl = build_decl (input_location, RESULT_DECL, 0, restype); | |
1427 | DECL_ARTIFICIAL (resdecl) = 1; | |
1428 | DECL_IGNORED_P (resdecl) = 1; | |
1429 | DECL_RESULT (thunk_fndecl) = resdecl; | |
1430 | } | |
1431 | else | |
1432 | resdecl = DECL_RESULT (thunk_fndecl); | |
1433 | ||
1434 | bb = then_bb = else_bb = return_bb = init_lowered_empty_function (thunk_fndecl); | |
1435 | ||
1436 | bsi = gsi_start_bb (bb); | |
1437 | ||
1438 | /* Build call to the function being thunked. */ | |
1439 | if (!VOID_TYPE_P (restype)) | |
1440 | { | |
1441 | if (!is_gimple_reg_type (restype)) | |
1442 | { | |
1443 | restmp = resdecl; | |
2ab2ce89 | 1444 | add_local_decl (cfun, restmp); |
28454517 | 1445 | BLOCK_VARS (DECL_INITIAL (current_function_decl)) = restmp; |
1446 | } | |
1447 | else | |
1448 | restmp = create_tmp_var_raw (restype, "retval"); | |
1449 | } | |
1450 | ||
1767a056 | 1451 | for (arg = a; arg; arg = DECL_CHAIN (arg)) |
28454517 | 1452 | nargs++; |
1453 | vargs = VEC_alloc (tree, heap, nargs); | |
1454 | if (this_adjusting) | |
1455 | VEC_quick_push (tree, vargs, | |
1456 | thunk_adjust (&bsi, | |
1457 | a, 1, fixed_offset, | |
1458 | virtual_offset)); | |
1459 | else | |
1460 | VEC_quick_push (tree, vargs, a); | |
1767a056 | 1461 | for (i = 1, arg = DECL_CHAIN (a); i < nargs; i++, arg = DECL_CHAIN (arg)) |
28454517 | 1462 | VEC_quick_push (tree, vargs, arg); |
1463 | call = gimple_build_call_vec (build_fold_addr_expr_loc (0, alias), vargs); | |
1464 | VEC_free (tree, heap, vargs); | |
1465 | gimple_call_set_cannot_inline (call, true); | |
1466 | gimple_call_set_from_thunk (call, true); | |
1467 | if (restmp) | |
1468 | gimple_call_set_lhs (call, restmp); | |
1469 | gsi_insert_after (&bsi, call, GSI_NEW_STMT); | |
1470 | mark_symbols_for_renaming (call); | |
1471 | find_referenced_vars_in (call); | |
1472 | update_stmt (call); | |
1473 | ||
1474 | if (restmp && !this_adjusting) | |
1475 | { | |
57ab8ec3 | 1476 | tree true_label = NULL_TREE; |
28454517 | 1477 | |
1478 | if (TREE_CODE (TREE_TYPE (restmp)) == POINTER_TYPE) | |
1479 | { | |
1480 | gimple stmt; | |
1481 | /* If the return type is a pointer, we need to | |
1482 | protect against NULL. We know there will be an | |
1483 | adjustment, because that's why we're emitting a | |
1484 | thunk. */ | |
1485 | then_bb = create_basic_block (NULL, (void *) 0, bb); | |
1486 | return_bb = create_basic_block (NULL, (void *) 0, then_bb); | |
1487 | else_bb = create_basic_block (NULL, (void *) 0, else_bb); | |
1488 | remove_edge (single_succ_edge (bb)); | |
1489 | true_label = gimple_block_label (then_bb); | |
28454517 | 1490 | stmt = gimple_build_cond (NE_EXPR, restmp, |
385f3f36 | 1491 | build_zero_cst (TREE_TYPE (restmp)), |
28454517 | 1492 | NULL_TREE, NULL_TREE); |
1493 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
1494 | make_edge (bb, then_bb, EDGE_TRUE_VALUE); | |
1495 | make_edge (bb, else_bb, EDGE_FALSE_VALUE); | |
1496 | make_edge (return_bb, EXIT_BLOCK_PTR, 0); | |
1497 | make_edge (then_bb, return_bb, EDGE_FALLTHRU); | |
1498 | make_edge (else_bb, return_bb, EDGE_FALLTHRU); | |
1499 | bsi = gsi_last_bb (then_bb); | |
1500 | } | |
1501 | ||
1502 | restmp = thunk_adjust (&bsi, restmp, /*this_adjusting=*/0, | |
1503 | fixed_offset, virtual_offset); | |
1504 | if (true_label) | |
1505 | { | |
1506 | gimple stmt; | |
1507 | bsi = gsi_last_bb (else_bb); | |
385f3f36 | 1508 | stmt = gimple_build_assign (restmp, |
1509 | build_zero_cst (TREE_TYPE (restmp))); | |
28454517 | 1510 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); |
1511 | bsi = gsi_last_bb (return_bb); | |
1512 | } | |
1513 | } | |
1514 | else | |
1515 | gimple_call_set_tail (call, true); | |
1516 | ||
1517 | /* Build return value. */ | |
1518 | ret = gimple_build_return (restmp); | |
1519 | gsi_insert_after (&bsi, ret, GSI_NEW_STMT); | |
1520 | ||
1521 | delete_unreachable_blocks (); | |
1522 | update_ssa (TODO_update_ssa); | |
1523 | ||
1524 | cgraph_remove_same_body_alias (node); | |
1525 | /* Since we want to emit the thunk, we explicitly mark its name as | |
1526 | referenced. */ | |
28454517 | 1527 | cgraph_add_new_function (thunk_fndecl, true); |
1528 | bitmap_obstack_release (NULL); | |
1529 | } | |
1530 | current_function_decl = NULL; | |
1531 | } | |
1532 | ||
ae01b312 | 1533 | /* Expand function specified by NODE. */ |
e6d2b2d8 | 1534 | |
ae01b312 | 1535 | static void |
d9d9733a | 1536 | cgraph_expand_function (struct cgraph_node *node) |
ae01b312 | 1537 | { |
1538 | tree decl = node->decl; | |
1539 | ||
b0cdf642 | 1540 | /* We ought to not compile any inline clones. */ |
cc636d56 | 1541 | gcc_assert (!node->global.inlined_to); |
b0cdf642 | 1542 | |
6329636b | 1543 | announce_function (decl); |
09fc9532 | 1544 | node->process = 0; |
ed772161 | 1545 | if (node->same_body) |
1546 | { | |
28454517 | 1547 | struct cgraph_node *alias, *next; |
ed772161 | 1548 | bool saved_alias = node->alias; |
28454517 | 1549 | for (alias = node->same_body; |
1550 | alias && alias->next; alias = alias->next) | |
1551 | ; | |
1552 | /* Walk aliases in the order they were created; it is possible that | |
1553 | thunks reffers to the aliases made earlier. */ | |
1554 | for (; alias; alias = next) | |
1555 | { | |
1556 | next = alias->previous; | |
1557 | if (!alias->thunk.thunk_p) | |
1558 | assemble_alias (alias->decl, | |
1559 | DECL_ASSEMBLER_NAME (alias->thunk.alias)); | |
1560 | else | |
1561 | assemble_thunk (alias); | |
1562 | } | |
ed772161 | 1563 | node->alias = saved_alias; |
f7777314 | 1564 | cgraph_process_new_functions (); |
ed772161 | 1565 | } |
f7777314 | 1566 | |
1567 | gcc_assert (node->lowered); | |
1568 | ||
1569 | /* Generate RTL for the body of DECL. */ | |
1570 | tree_rest_of_compilation (decl); | |
1571 | ||
1572 | /* Make sure that BE didn't give up on compiling. */ | |
1573 | gcc_assert (TREE_ASM_WRITTEN (decl)); | |
1574 | current_function_decl = NULL; | |
1a1a827a | 1575 | gcc_assert (!cgraph_preserve_function_body_p (decl)); |
1576 | cgraph_release_function_body (node); | |
1577 | /* Eliminate all call edges. This is important so the GIMPLE_CALL no longer | |
1578 | points to the dead function body. */ | |
1579 | cgraph_node_remove_callees (node); | |
e1be32b8 | 1580 | |
1581 | cgraph_function_flags_ready = true; | |
ae01b312 | 1582 | } |
1583 | ||
b0cdf642 | 1584 | /* Return true when CALLER_DECL should be inlined into CALLEE_DECL. */ |
d7c6d889 | 1585 | |
1586 | bool | |
326a9581 | 1587 | cgraph_inline_p (struct cgraph_edge *e, cgraph_inline_failed_t *reason) |
d7c6d889 | 1588 | { |
b0cdf642 | 1589 | *reason = e->inline_failed; |
1590 | return !e->inline_failed; | |
d7c6d889 | 1591 | } |
b0cdf642 | 1592 | |
acc70efa | 1593 | |
acc70efa | 1594 | |
d9d9733a | 1595 | /* Expand all functions that must be output. |
1596 | ||
d7c6d889 | 1597 | Attempt to topologically sort the nodes so function is output when |
1598 | all called functions are already assembled to allow data to be | |
91c82c20 | 1599 | propagated across the callgraph. Use a stack to get smaller distance |
3927afe0 | 1600 | between a function and its callees (later we may choose to use a more |
d7c6d889 | 1601 | sophisticated algorithm for function reordering; we will likely want |
1602 | to use subsections to make the output functions appear in top-down | |
1603 | order). */ | |
1604 | ||
1605 | static void | |
a6868229 | 1606 | cgraph_expand_all_functions (void) |
d7c6d889 | 1607 | { |
1608 | struct cgraph_node *node; | |
4c36ffe6 | 1609 | struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); |
c04e3894 | 1610 | int order_pos, new_order_pos = 0; |
d7c6d889 | 1611 | int i; |
1612 | ||
d7c6d889 | 1613 | order_pos = cgraph_postorder (order); |
cc636d56 | 1614 | gcc_assert (order_pos == cgraph_n_nodes); |
d7c6d889 | 1615 | |
7bd28bba | 1616 | /* Garbage collector may remove inline clones we eliminate during |
b0cdf642 | 1617 | optimization. So we must be sure to not reference them. */ |
1618 | for (i = 0; i < order_pos; i++) | |
09fc9532 | 1619 | if (order[i]->process) |
b0cdf642 | 1620 | order[new_order_pos++] = order[i]; |
1621 | ||
1622 | for (i = new_order_pos - 1; i >= 0; i--) | |
d7c6d889 | 1623 | { |
1624 | node = order[i]; | |
09fc9532 | 1625 | if (node->process) |
d7c6d889 | 1626 | { |
cc636d56 | 1627 | gcc_assert (node->reachable); |
09fc9532 | 1628 | node->process = 0; |
d7c6d889 | 1629 | cgraph_expand_function (node); |
1630 | } | |
1631 | } | |
523c1122 | 1632 | cgraph_process_new_functions (); |
773c5ba7 | 1633 | |
d7c6d889 | 1634 | free (order); |
773c5ba7 | 1635 | |
d7c6d889 | 1636 | } |
1637 | ||
56af936e | 1638 | /* This is used to sort the node types by the cgraph order number. */ |
1639 | ||
0b09525f | 1640 | enum cgraph_order_sort_kind |
1641 | { | |
1642 | ORDER_UNDEFINED = 0, | |
1643 | ORDER_FUNCTION, | |
1644 | ORDER_VAR, | |
1645 | ORDER_ASM | |
1646 | }; | |
1647 | ||
56af936e | 1648 | struct cgraph_order_sort |
1649 | { | |
0b09525f | 1650 | enum cgraph_order_sort_kind kind; |
56af936e | 1651 | union |
1652 | { | |
1653 | struct cgraph_node *f; | |
1d416bd7 | 1654 | struct varpool_node *v; |
56af936e | 1655 | struct cgraph_asm_node *a; |
1656 | } u; | |
1657 | }; | |
1658 | ||
1659 | /* Output all functions, variables, and asm statements in the order | |
1660 | according to their order fields, which is the order in which they | |
1661 | appeared in the file. This implements -fno-toplevel-reorder. In | |
1662 | this mode we may output functions and variables which don't really | |
1663 | need to be output. */ | |
1664 | ||
1665 | static void | |
1666 | cgraph_output_in_order (void) | |
1667 | { | |
1668 | int max; | |
56af936e | 1669 | struct cgraph_order_sort *nodes; |
1670 | int i; | |
1671 | struct cgraph_node *pf; | |
1d416bd7 | 1672 | struct varpool_node *pv; |
56af936e | 1673 | struct cgraph_asm_node *pa; |
1674 | ||
1675 | max = cgraph_order; | |
3e1cde87 | 1676 | nodes = XCNEWVEC (struct cgraph_order_sort, max); |
56af936e | 1677 | |
1d416bd7 | 1678 | varpool_analyze_pending_decls (); |
56af936e | 1679 | |
1680 | for (pf = cgraph_nodes; pf; pf = pf->next) | |
1681 | { | |
09fc9532 | 1682 | if (pf->process) |
56af936e | 1683 | { |
1684 | i = pf->order; | |
1685 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1686 | nodes[i].kind = ORDER_FUNCTION; | |
1687 | nodes[i].u.f = pf; | |
1688 | } | |
1689 | } | |
1690 | ||
1d416bd7 | 1691 | for (pv = varpool_nodes_queue; pv; pv = pv->next_needed) |
56af936e | 1692 | { |
1693 | i = pv->order; | |
1694 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1695 | nodes[i].kind = ORDER_VAR; | |
1696 | nodes[i].u.v = pv; | |
1697 | } | |
1698 | ||
1699 | for (pa = cgraph_asm_nodes; pa; pa = pa->next) | |
1700 | { | |
1701 | i = pa->order; | |
1702 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1703 | nodes[i].kind = ORDER_ASM; | |
1704 | nodes[i].u.a = pa; | |
1705 | } | |
56af936e | 1706 | |
304e5318 | 1707 | /* In toplevel reorder mode we output all statics; mark them as needed. */ |
1708 | for (i = 0; i < max; ++i) | |
1709 | { | |
1710 | if (nodes[i].kind == ORDER_VAR) | |
1711 | { | |
1712 | varpool_mark_needed_node (nodes[i].u.v); | |
1713 | } | |
1714 | } | |
1715 | varpool_empty_needed_queue (); | |
1716 | ||
56af936e | 1717 | for (i = 0; i < max; ++i) |
1718 | { | |
1719 | switch (nodes[i].kind) | |
1720 | { | |
1721 | case ORDER_FUNCTION: | |
09fc9532 | 1722 | nodes[i].u.f->process = 0; |
56af936e | 1723 | cgraph_expand_function (nodes[i].u.f); |
1724 | break; | |
1725 | ||
1726 | case ORDER_VAR: | |
1d416bd7 | 1727 | varpool_assemble_decl (nodes[i].u.v); |
56af936e | 1728 | break; |
1729 | ||
1730 | case ORDER_ASM: | |
1731 | assemble_asm (nodes[i].u.a->asm_str); | |
1732 | break; | |
1733 | ||
1734 | case ORDER_UNDEFINED: | |
1735 | break; | |
1736 | ||
1737 | default: | |
1738 | gcc_unreachable (); | |
1739 | } | |
1740 | } | |
4b4ea2db | 1741 | |
1742 | cgraph_asm_nodes = NULL; | |
3e1cde87 | 1743 | free (nodes); |
56af936e | 1744 | } |
1745 | ||
b0cdf642 | 1746 | /* Return true when function body of DECL still needs to be kept around |
1747 | for later re-use. */ | |
1748 | bool | |
1749 | cgraph_preserve_function_body_p (tree decl) | |
1750 | { | |
1751 | struct cgraph_node *node; | |
8d8c4c8d | 1752 | |
1753 | gcc_assert (cgraph_global_info_ready); | |
b0cdf642 | 1754 | /* Look if there is any clone around. */ |
ccf4ab6b | 1755 | node = cgraph_node (decl); |
1756 | if (node->clones) | |
1757 | return true; | |
b0cdf642 | 1758 | return false; |
1759 | } | |
1760 | ||
77fce4cd | 1761 | static void |
1762 | ipa_passes (void) | |
1763 | { | |
87d4aa85 | 1764 | set_cfun (NULL); |
4b14adf9 | 1765 | current_function_decl = NULL; |
75a70cf9 | 1766 | gimple_register_cfg_hooks (); |
77fce4cd | 1767 | bitmap_obstack_initialize (NULL); |
59dd4830 | 1768 | |
c9036234 | 1769 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_START, NULL); |
1770 | ||
59dd4830 | 1771 | if (!in_lto_p) |
7b2e8956 | 1772 | { |
1773 | execute_ipa_pass_list (all_small_ipa_passes); | |
1774 | if (seen_error ()) | |
1775 | return; | |
1776 | } | |
9ed5b1f5 | 1777 | |
7bfefa9d | 1778 | /* If pass_all_early_optimizations was not scheduled, the state of |
1779 | the cgraph will not be properly updated. Update it now. */ | |
1780 | if (cgraph_state < CGRAPH_STATE_IPA_SSA) | |
1781 | cgraph_state = CGRAPH_STATE_IPA_SSA; | |
9ed5b1f5 | 1782 | |
7bfefa9d | 1783 | if (!in_lto_p) |
1784 | { | |
1785 | /* Generate coverage variables and constructors. */ | |
1786 | coverage_finish (); | |
1787 | ||
1788 | /* Process new functions added. */ | |
1789 | set_cfun (NULL); | |
1790 | current_function_decl = NULL; | |
1791 | cgraph_process_new_functions (); | |
7bfefa9d | 1792 | |
c9036234 | 1793 | execute_ipa_summary_passes |
1794 | ((struct ipa_opt_pass_d *) all_regular_ipa_passes); | |
8867b500 | 1795 | } |
23433d72 | 1796 | |
1797 | /* Some targets need to handle LTO assembler output specially. */ | |
1798 | if (flag_generate_lto) | |
1799 | targetm.asm_out.lto_start (); | |
1800 | ||
7bfefa9d | 1801 | execute_ipa_summary_passes ((struct ipa_opt_pass_d *) all_lto_gen_passes); |
1802 | ||
1803 | if (!in_lto_p) | |
1804 | ipa_write_summaries (); | |
1805 | ||
23433d72 | 1806 | if (flag_generate_lto) |
1807 | targetm.asm_out.lto_end (); | |
1808 | ||
8867b500 | 1809 | if (!flag_ltrans) |
1810 | execute_ipa_pass_list (all_regular_ipa_passes); | |
c9036234 | 1811 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_END, NULL); |
9ed5b1f5 | 1812 | |
77fce4cd | 1813 | bitmap_obstack_release (NULL); |
1814 | } | |
1815 | ||
34e5cced | 1816 | |
ae01b312 | 1817 | /* Perform simple optimizations based on callgraph. */ |
1818 | ||
7bfefa9d | 1819 | void |
d9d9733a | 1820 | cgraph_optimize (void) |
ae01b312 | 1821 | { |
852f689e | 1822 | if (seen_error ()) |
cb2b5570 | 1823 | return; |
1824 | ||
b0cdf642 | 1825 | #ifdef ENABLE_CHECKING |
1826 | verify_cgraph (); | |
1827 | #endif | |
a861fe52 | 1828 | |
c1dcd13c | 1829 | /* Frontend may output common variables after the unit has been finalized. |
1830 | It is safe to deal with them here as they are always zero initialized. */ | |
1d416bd7 | 1831 | varpool_analyze_pending_decls (); |
e9f08e82 | 1832 | |
f79b6507 | 1833 | timevar_push (TV_CGRAPHOPT); |
51949610 | 1834 | if (pre_ipa_mem_report) |
1835 | { | |
1836 | fprintf (stderr, "Memory consumption before IPA\n"); | |
1837 | dump_memory_report (false); | |
1838 | } | |
d7c6d889 | 1839 | if (!quiet_flag) |
cd6bca02 | 1840 | fprintf (stderr, "Performing interprocedural optimizations\n"); |
523c1122 | 1841 | cgraph_state = CGRAPH_STATE_IPA; |
c04e3894 | 1842 | |
be4d0974 | 1843 | /* Don't run the IPA passes if there was any error or sorry messages. */ |
852f689e | 1844 | if (!seen_error ()) |
be4d0974 | 1845 | ipa_passes (); |
1846 | ||
34e5cced | 1847 | /* Do nothing else if any IPA pass found errors. */ |
852f689e | 1848 | if (seen_error ()) |
021c1c18 | 1849 | { |
1850 | timevar_pop (TV_CGRAPHOPT); | |
1851 | return; | |
1852 | } | |
34e5cced | 1853 | |
e1be32b8 | 1854 | /* This pass remove bodies of extern inline functions we never inlined. |
1855 | Do this later so other IPA passes see what is really going on. */ | |
1856 | cgraph_remove_unreachable_nodes (false, dump_file); | |
80a85d8a | 1857 | cgraph_global_info_ready = true; |
f79b6507 | 1858 | if (cgraph_dump_file) |
1859 | { | |
e4200070 | 1860 | fprintf (cgraph_dump_file, "Optimized "); |
f79b6507 | 1861 | dump_cgraph (cgraph_dump_file); |
c1dcd13c | 1862 | dump_varpool (cgraph_dump_file); |
f79b6507 | 1863 | } |
51949610 | 1864 | if (post_ipa_mem_report) |
1865 | { | |
defa2fa6 | 1866 | fprintf (stderr, "Memory consumption after IPA\n"); |
51949610 | 1867 | dump_memory_report (false); |
1868 | } | |
f79b6507 | 1869 | timevar_pop (TV_CGRAPHOPT); |
ae01b312 | 1870 | |
d7c6d889 | 1871 | /* Output everything. */ |
47306a5d | 1872 | (*debug_hooks->assembly_start) (); |
e4200070 | 1873 | if (!quiet_flag) |
1874 | fprintf (stderr, "Assembling functions:\n"); | |
b0cdf642 | 1875 | #ifdef ENABLE_CHECKING |
1876 | verify_cgraph (); | |
1877 | #endif | |
56af936e | 1878 | |
ccf4ab6b | 1879 | cgraph_materialize_all_clones (); |
acc70efa | 1880 | cgraph_mark_functions_to_output (); |
c1dcd13c | 1881 | |
523c1122 | 1882 | cgraph_state = CGRAPH_STATE_EXPANSION; |
56af936e | 1883 | if (!flag_toplevel_reorder) |
1884 | cgraph_output_in_order (); | |
1885 | else | |
1886 | { | |
1887 | cgraph_output_pending_asms (); | |
1888 | ||
1889 | cgraph_expand_all_functions (); | |
1d416bd7 | 1890 | varpool_remove_unreferenced_decls (); |
56af936e | 1891 | |
1d416bd7 | 1892 | varpool_assemble_pending_decls (); |
56af936e | 1893 | } |
523c1122 | 1894 | cgraph_process_new_functions (); |
1895 | cgraph_state = CGRAPH_STATE_FINISHED; | |
c1dcd13c | 1896 | |
f79b6507 | 1897 | if (cgraph_dump_file) |
1898 | { | |
e4200070 | 1899 | fprintf (cgraph_dump_file, "\nFinal "); |
f79b6507 | 1900 | dump_cgraph (cgraph_dump_file); |
7410370b | 1901 | dump_varpool (cgraph_dump_file); |
f79b6507 | 1902 | } |
b0cdf642 | 1903 | #ifdef ENABLE_CHECKING |
1904 | verify_cgraph (); | |
4ee9c684 | 1905 | /* Double check that all inline clones are gone and that all |
1906 | function bodies have been released from memory. */ | |
852f689e | 1907 | if (!seen_error ()) |
4ee9c684 | 1908 | { |
1909 | struct cgraph_node *node; | |
1910 | bool error_found = false; | |
1911 | ||
1912 | for (node = cgraph_nodes; node; node = node->next) | |
1913 | if (node->analyzed | |
1914 | && (node->global.inlined_to | |
1a1a827a | 1915 | || gimple_has_body_p (node->decl))) |
4ee9c684 | 1916 | { |
1917 | error_found = true; | |
1918 | dump_cgraph_node (stderr, node); | |
a0c938f0 | 1919 | } |
4ee9c684 | 1920 | if (error_found) |
c04e3894 | 1921 | internal_error ("nodes with unreleased memory found"); |
4ee9c684 | 1922 | } |
b0cdf642 | 1923 | #endif |
ae01b312 | 1924 | } |
34e5cced | 1925 | |
121f3051 | 1926 | void |
1927 | init_cgraph (void) | |
1928 | { | |
01ec0a6c | 1929 | if (!cgraph_dump_file) |
1930 | cgraph_dump_file = dump_begin (TDI_cgraph, NULL); | |
121f3051 | 1931 | } |
b5d36404 | 1932 | |
a0c938f0 | 1933 | /* The edges representing the callers of the NEW_VERSION node were |
b5d36404 | 1934 | fixed by cgraph_function_versioning (), now the call_expr in their |
1935 | respective tree code should be updated to call the NEW_VERSION. */ | |
1936 | ||
1937 | static void | |
1938 | update_call_expr (struct cgraph_node *new_version) | |
1939 | { | |
1940 | struct cgraph_edge *e; | |
1941 | ||
1942 | gcc_assert (new_version); | |
75a70cf9 | 1943 | |
1944 | /* Update the call expr on the edges to call the new version. */ | |
b5d36404 | 1945 | for (e = new_version->callers; e; e = e->next_caller) |
e03a95e7 | 1946 | { |
1947 | struct function *inner_function = DECL_STRUCT_FUNCTION (e->caller->decl); | |
1948 | gimple_call_set_fndecl (e->call_stmt, new_version->decl); | |
e38def9c | 1949 | maybe_clean_eh_stmt_fn (inner_function, e->call_stmt); |
e03a95e7 | 1950 | } |
b5d36404 | 1951 | } |
1952 | ||
1953 | ||
1954 | /* Create a new cgraph node which is the new version of | |
1955 | OLD_VERSION node. REDIRECT_CALLERS holds the callers | |
1956 | edges which should be redirected to point to | |
1957 | NEW_VERSION. ALL the callees edges of OLD_VERSION | |
1958 | are cloned to the new version node. Return the new | |
b06ab5fa | 1959 | version node. |
1960 | ||
1961 | If non-NULL BLOCK_TO_COPY determine what basic blocks | |
1962 | was copied to prevent duplications of calls that are dead | |
1963 | in the clone. */ | |
b5d36404 | 1964 | |
1965 | static struct cgraph_node * | |
1966 | cgraph_copy_node_for_versioning (struct cgraph_node *old_version, | |
4460a647 | 1967 | tree new_decl, |
b06ab5fa | 1968 | VEC(cgraph_edge_p,heap) *redirect_callers, |
1969 | bitmap bbs_to_copy) | |
1970 | { | |
b5d36404 | 1971 | struct cgraph_node *new_version; |
32936803 | 1972 | struct cgraph_edge *e; |
b5d36404 | 1973 | unsigned i; |
1974 | ||
1975 | gcc_assert (old_version); | |
a0c938f0 | 1976 | |
b5d36404 | 1977 | new_version = cgraph_node (new_decl); |
1978 | ||
1979 | new_version->analyzed = true; | |
1980 | new_version->local = old_version->local; | |
a70a5e2c | 1981 | new_version->local.externally_visible = false; |
1982 | new_version->local.local = true; | |
1983 | new_version->local.vtable_method = false; | |
b5d36404 | 1984 | new_version->global = old_version->global; |
a93f1c3b | 1985 | new_version->rtl = old_version->rtl; |
b5d36404 | 1986 | new_version->reachable = true; |
1987 | new_version->count = old_version->count; | |
1988 | ||
a70a5e2c | 1989 | for (e = old_version->callees; e; e=e->next_callee) |
b06ab5fa | 1990 | if (!bbs_to_copy |
1991 | || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) | |
1992 | cgraph_clone_edge (e, new_version, e->call_stmt, | |
1993 | e->lto_stmt_uid, REG_BR_PROB_BASE, | |
1994 | CGRAPH_FREQ_BASE, | |
1995 | e->loop_nest, true); | |
a70a5e2c | 1996 | for (e = old_version->indirect_calls; e; e=e->next_callee) |
b06ab5fa | 1997 | if (!bbs_to_copy |
1998 | || bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index)) | |
1999 | cgraph_clone_edge (e, new_version, e->call_stmt, | |
2000 | e->lto_stmt_uid, REG_BR_PROB_BASE, | |
2001 | CGRAPH_FREQ_BASE, | |
2002 | e->loop_nest, true); | |
48148244 | 2003 | FOR_EACH_VEC_ELT (cgraph_edge_p, redirect_callers, i, e) |
4460a647 | 2004 | { |
2005 | /* Redirect calls to the old version node to point to its new | |
2006 | version. */ | |
2007 | cgraph_redirect_edge_callee (e, new_version); | |
2008 | } | |
b5d36404 | 2009 | |
2010 | return new_version; | |
2011 | } | |
2012 | ||
2013 | /* Perform function versioning. | |
a0c938f0 | 2014 | Function versioning includes copying of the tree and |
b5d36404 | 2015 | a callgraph update (creating a new cgraph node and updating |
2016 | its callees and callers). | |
2017 | ||
2018 | REDIRECT_CALLERS varray includes the edges to be redirected | |
2019 | to the new version. | |
2020 | ||
2021 | TREE_MAP is a mapping of tree nodes we want to replace with | |
2022 | new ones (according to results of prior analysis). | |
2023 | OLD_VERSION_NODE is the node that is versioned. | |
48e1416a | 2024 | It returns the new version's cgraph node. |
b06ab5fa | 2025 | If non-NULL ARGS_TO_SKIP determine function parameters to remove |
2026 | from new version. | |
2027 | If non-NULL BLOCK_TO_COPY determine what basic blocks to copy. | |
2028 | If non_NULL NEW_ENTRY determine new entry BB of the clone. */ | |
b5d36404 | 2029 | |
2030 | struct cgraph_node * | |
2031 | cgraph_function_versioning (struct cgraph_node *old_version_node, | |
4460a647 | 2032 | VEC(cgraph_edge_p,heap) *redirect_callers, |
ccf4ab6b | 2033 | VEC (ipa_replace_map_p,gc)* tree_map, |
a70a5e2c | 2034 | bitmap args_to_skip, |
b06ab5fa | 2035 | bitmap bbs_to_copy, |
2036 | basic_block new_entry_block, | |
a70a5e2c | 2037 | const char *clone_name) |
b5d36404 | 2038 | { |
2039 | tree old_decl = old_version_node->decl; | |
2040 | struct cgraph_node *new_version_node = NULL; | |
2041 | tree new_decl; | |
2042 | ||
2043 | if (!tree_versionable_function_p (old_decl)) | |
2044 | return NULL; | |
2045 | ||
3c97c75d | 2046 | gcc_assert (old_version_node->local.can_change_signature || !args_to_skip); |
2047 | ||
b5d36404 | 2048 | /* Make a new FUNCTION_DECL tree node for the |
2049 | new version. */ | |
5afe38fe | 2050 | if (!args_to_skip) |
2051 | new_decl = copy_node (old_decl); | |
2052 | else | |
2053 | new_decl = build_function_decl_skip_args (old_decl, args_to_skip); | |
b5d36404 | 2054 | |
df0b8dfb | 2055 | /* Generate a new name for the new version. */ |
2056 | DECL_NAME (new_decl) = clone_function_name (old_decl, clone_name); | |
2057 | SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl)); | |
2058 | SET_DECL_RTL (new_decl, NULL); | |
2059 | ||
b5d36404 | 2060 | /* Create the new version's call-graph node. |
2061 | and update the edges of the new node. */ | |
2062 | new_version_node = | |
2063 | cgraph_copy_node_for_versioning (old_version_node, new_decl, | |
b06ab5fa | 2064 | redirect_callers, bbs_to_copy); |
b5d36404 | 2065 | |
2066 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
b06ab5fa | 2067 | tree_function_versioning (old_decl, new_decl, tree_map, false, args_to_skip, |
2068 | bbs_to_copy, new_entry_block); | |
b5d36404 | 2069 | |
a0c938f0 | 2070 | /* Update the new version's properties. |
e03a95e7 | 2071 | Make The new version visible only within this translation unit. Make sure |
2072 | that is not weak also. | |
a0c938f0 | 2073 | ??? We cannot use COMDAT linkage because there is no |
b5d36404 | 2074 | ABI support for this. */ |
6137cc9f | 2075 | cgraph_make_decl_local (new_version_node->decl); |
f014e39d | 2076 | DECL_VIRTUAL_P (new_version_node->decl) = 0; |
b5d36404 | 2077 | new_version_node->local.externally_visible = 0; |
2078 | new_version_node->local.local = 1; | |
2079 | new_version_node->lowered = true; | |
f014e39d | 2080 | |
e03a95e7 | 2081 | /* Update the call_expr on the edges to call the new version node. */ |
2082 | update_call_expr (new_version_node); | |
48e1416a | 2083 | |
50828ed8 | 2084 | cgraph_call_function_insertion_hooks (new_version_node); |
b5d36404 | 2085 | return new_version_node; |
2086 | } | |
469679ab | 2087 | |
2088 | /* Produce separate function body for inline clones so the offline copy can be | |
2089 | modified without affecting them. */ | |
2090 | struct cgraph_node * | |
2091 | save_inline_function_body (struct cgraph_node *node) | |
2092 | { | |
ccf4ab6b | 2093 | struct cgraph_node *first_clone, *n; |
469679ab | 2094 | |
2095 | gcc_assert (node == cgraph_node (node->decl)); | |
2096 | ||
2097 | cgraph_lower_function (node); | |
2098 | ||
ccf4ab6b | 2099 | first_clone = node->clones; |
469679ab | 2100 | |
2101 | first_clone->decl = copy_node (node->decl); | |
469679ab | 2102 | cgraph_insert_node_to_hashtable (first_clone); |
2103 | gcc_assert (first_clone == cgraph_node (first_clone->decl)); | |
ccf4ab6b | 2104 | if (first_clone->next_sibling_clone) |
2105 | { | |
2106 | for (n = first_clone->next_sibling_clone; n->next_sibling_clone; n = n->next_sibling_clone) | |
2107 | n->clone_of = first_clone; | |
2108 | n->clone_of = first_clone; | |
2109 | n->next_sibling_clone = first_clone->clones; | |
2110 | if (first_clone->clones) | |
2111 | first_clone->clones->prev_sibling_clone = n; | |
2112 | first_clone->clones = first_clone->next_sibling_clone; | |
2113 | first_clone->next_sibling_clone->prev_sibling_clone = NULL; | |
2114 | first_clone->next_sibling_clone = NULL; | |
2115 | gcc_assert (!first_clone->prev_sibling_clone); | |
2116 | } | |
2117 | first_clone->clone_of = NULL; | |
2118 | node->clones = NULL; | |
2119 | ||
2120 | if (first_clone->clones) | |
2121 | for (n = first_clone->clones; n != first_clone;) | |
2122 | { | |
2123 | gcc_assert (n->decl == node->decl); | |
2124 | n->decl = first_clone->decl; | |
2125 | if (n->clones) | |
2126 | n = n->clones; | |
2127 | else if (n->next_sibling_clone) | |
2128 | n = n->next_sibling_clone; | |
2129 | else | |
2130 | { | |
2131 | while (n != first_clone && !n->next_sibling_clone) | |
2132 | n = n->clone_of; | |
2133 | if (n != first_clone) | |
2134 | n = n->next_sibling_clone; | |
2135 | } | |
2136 | } | |
469679ab | 2137 | |
2138 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ | |
b06ab5fa | 2139 | tree_function_versioning (node->decl, first_clone->decl, NULL, true, NULL, |
2140 | NULL, NULL); | |
469679ab | 2141 | |
2142 | DECL_EXTERNAL (first_clone->decl) = 0; | |
ecd88073 | 2143 | DECL_COMDAT_GROUP (first_clone->decl) = NULL_TREE; |
469679ab | 2144 | TREE_PUBLIC (first_clone->decl) = 0; |
2145 | DECL_COMDAT (first_clone->decl) = 0; | |
7fe9b425 | 2146 | VEC_free (ipa_opt_pass, heap, |
6d1cc52c | 2147 | first_clone->ipa_transforms_to_apply); |
2148 | first_clone->ipa_transforms_to_apply = NULL; | |
469679ab | 2149 | |
469679ab | 2150 | #ifdef ENABLE_CHECKING |
2151 | verify_cgraph_node (first_clone); | |
2152 | #endif | |
2153 | return first_clone; | |
2154 | } | |
a861fe52 | 2155 | |
ccf4ab6b | 2156 | /* Given virtual clone, turn it into actual clone. */ |
2157 | static void | |
2158 | cgraph_materialize_clone (struct cgraph_node *node) | |
2159 | { | |
2160 | bitmap_obstack_initialize (NULL); | |
e748b31d | 2161 | node->former_clone_of = node->clone_of->decl; |
2162 | if (node->clone_of->former_clone_of) | |
2163 | node->former_clone_of = node->clone_of->former_clone_of; | |
ccf4ab6b | 2164 | /* Copy the OLD_VERSION_NODE function tree to the new version. */ |
2165 | tree_function_versioning (node->clone_of->decl, node->decl, | |
2166 | node->clone.tree_map, true, | |
b06ab5fa | 2167 | node->clone.args_to_skip, NULL, NULL); |
e20422ea | 2168 | if (cgraph_dump_file) |
2169 | { | |
2170 | dump_function_to_file (node->clone_of->decl, cgraph_dump_file, dump_flags); | |
2171 | dump_function_to_file (node->decl, cgraph_dump_file, dump_flags); | |
2172 | } | |
ccf4ab6b | 2173 | |
2174 | /* Function is no longer clone. */ | |
2175 | if (node->next_sibling_clone) | |
2176 | node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone; | |
2177 | if (node->prev_sibling_clone) | |
2178 | node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone; | |
2179 | else | |
2180 | node->clone_of->clones = node->next_sibling_clone; | |
2181 | node->next_sibling_clone = NULL; | |
2182 | node->prev_sibling_clone = NULL; | |
6d1cc52c | 2183 | if (!node->clone_of->analyzed && !node->clone_of->clones) |
7d6a1ec8 | 2184 | { |
2185 | cgraph_release_function_body (node->clone_of); | |
2186 | cgraph_node_remove_callees (node->clone_of); | |
2187 | ipa_remove_all_references (&node->clone_of->ref_list); | |
2188 | } | |
ccf4ab6b | 2189 | node->clone_of = NULL; |
2190 | bitmap_obstack_release (NULL); | |
2191 | } | |
2192 | ||
c596d830 | 2193 | /* If necessary, change the function declaration in the call statement |
2194 | associated with E so that it corresponds to the edge callee. */ | |
2195 | ||
2196 | gimple | |
2197 | cgraph_redirect_edge_call_stmt_to_callee (struct cgraph_edge *e) | |
2198 | { | |
2199 | tree decl = gimple_call_fndecl (e->call_stmt); | |
2200 | gimple new_stmt; | |
3fd0ca33 | 2201 | gimple_stmt_iterator gsi; |
2202 | bool gsi_computed = false; | |
1f449108 | 2203 | #ifdef ENABLE_CHECKING |
2204 | struct cgraph_node *node; | |
2205 | #endif | |
c596d830 | 2206 | |
1caef38b | 2207 | if (e->indirect_unknown_callee |
2208 | || decl == e->callee->decl | |
c596d830 | 2209 | /* Don't update call from same body alias to the real function. */ |
1caef38b | 2210 | || (decl && cgraph_get_node (decl) == cgraph_get_node (e->callee->decl))) |
c596d830 | 2211 | return e->call_stmt; |
2212 | ||
1f449108 | 2213 | #ifdef ENABLE_CHECKING |
1caef38b | 2214 | if (decl) |
2215 | { | |
2216 | node = cgraph_get_node (decl); | |
2217 | gcc_assert (!node || !node->clone.combined_args_to_skip); | |
2218 | } | |
1f449108 | 2219 | #endif |
e748b31d | 2220 | |
c596d830 | 2221 | if (cgraph_dump_file) |
2222 | { | |
2223 | fprintf (cgraph_dump_file, "updating call of %s/%i -> %s/%i: ", | |
2224 | cgraph_node_name (e->caller), e->caller->uid, | |
2225 | cgraph_node_name (e->callee), e->callee->uid); | |
2226 | print_gimple_stmt (cgraph_dump_file, e->call_stmt, 0, dump_flags); | |
e748b31d | 2227 | if (e->callee->clone.combined_args_to_skip) |
91aba934 | 2228 | { |
2229 | fprintf (cgraph_dump_file, " combined args to skip: "); | |
2230 | dump_bitmap (cgraph_dump_file, | |
2231 | e->callee->clone.combined_args_to_skip); | |
e748b31d | 2232 | } |
c596d830 | 2233 | } |
2234 | ||
9bab6a70 | 2235 | if (e->indirect_info && |
2236 | e->indirect_info->thunk_delta != 0 | |
3fd0ca33 | 2237 | && (!e->callee->clone.combined_args_to_skip |
2238 | || !bitmap_bit_p (e->callee->clone.combined_args_to_skip, 0))) | |
2239 | { | |
2240 | if (cgraph_dump_file) | |
9bab6a70 | 2241 | fprintf (cgraph_dump_file, " Thunk delta is " |
2242 | HOST_WIDE_INT_PRINT_DEC "\n", e->indirect_info->thunk_delta); | |
3fd0ca33 | 2243 | gsi = gsi_for_stmt (e->call_stmt); |
2244 | gsi_computed = true; | |
9bab6a70 | 2245 | gimple_adjust_this_by_delta (&gsi, |
2246 | build_int_cst (sizetype, | |
2247 | e->indirect_info->thunk_delta)); | |
2248 | e->indirect_info->thunk_delta = 0; | |
3fd0ca33 | 2249 | } |
2250 | ||
c596d830 | 2251 | if (e->callee->clone.combined_args_to_skip) |
91aba934 | 2252 | { |
092cd838 | 2253 | int lp_nr; |
91aba934 | 2254 | |
2255 | new_stmt | |
2256 | = gimple_call_copy_skip_args (e->call_stmt, | |
2257 | e->callee->clone.combined_args_to_skip); | |
75c7f5a5 | 2258 | gimple_call_set_fndecl (new_stmt, e->callee->decl); |
91aba934 | 2259 | |
2260 | if (gimple_vdef (new_stmt) | |
2261 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
2262 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
2263 | ||
3fd0ca33 | 2264 | if (!gsi_computed) |
2265 | gsi = gsi_for_stmt (e->call_stmt); | |
9126b675 | 2266 | gsi_replace (&gsi, new_stmt, false); |
092cd838 | 2267 | /* We need to defer cleaning EH info on the new statement to |
2268 | fixup-cfg. We may not have dominator information at this point | |
2269 | and thus would end up with unreachable blocks and have no way | |
2270 | to communicate that we need to run CFG cleanup then. */ | |
2271 | lp_nr = lookup_stmt_eh_lp (e->call_stmt); | |
2272 | if (lp_nr != 0) | |
2273 | { | |
2274 | remove_stmt_from_eh_lp (e->call_stmt); | |
2275 | add_stmt_to_eh_lp (new_stmt, lp_nr); | |
2276 | } | |
91aba934 | 2277 | } |
c596d830 | 2278 | else |
75c7f5a5 | 2279 | { |
2280 | new_stmt = e->call_stmt; | |
2281 | gimple_call_set_fndecl (new_stmt, e->callee->decl); | |
2282 | update_stmt (new_stmt); | |
2283 | } | |
c596d830 | 2284 | |
c596d830 | 2285 | cgraph_set_call_stmt_including_clones (e->caller, e->call_stmt, new_stmt); |
2286 | ||
2287 | if (cgraph_dump_file) | |
2288 | { | |
2289 | fprintf (cgraph_dump_file, " updated to:"); | |
2290 | print_gimple_stmt (cgraph_dump_file, e->call_stmt, 0, dump_flags); | |
2291 | } | |
2292 | return new_stmt; | |
2293 | } | |
2294 | ||
ccf4ab6b | 2295 | /* Once all functions from compilation unit are in memory, produce all clones |
c596d830 | 2296 | and update all calls. We might also do this on demand if we don't want to |
2297 | bring all functions to memory prior compilation, but current WHOPR | |
2298 | implementation does that and it is is bit easier to keep everything right in | |
2299 | this order. */ | |
ccf4ab6b | 2300 | void |
2301 | cgraph_materialize_all_clones (void) | |
2302 | { | |
2303 | struct cgraph_node *node; | |
2304 | bool stabilized = false; | |
2305 | ||
2306 | if (cgraph_dump_file) | |
2307 | fprintf (cgraph_dump_file, "Materializing clones\n"); | |
2308 | #ifdef ENABLE_CHECKING | |
2309 | verify_cgraph (); | |
2310 | #endif | |
2311 | ||
2312 | /* We can also do topological order, but number of iterations should be | |
2313 | bounded by number of IPA passes since single IPA pass is probably not | |
2314 | going to create clones of clones it created itself. */ | |
2315 | while (!stabilized) | |
2316 | { | |
2317 | stabilized = true; | |
2318 | for (node = cgraph_nodes; node; node = node->next) | |
2319 | { | |
2320 | if (node->clone_of && node->decl != node->clone_of->decl | |
2321 | && !gimple_has_body_p (node->decl)) | |
2322 | { | |
2323 | if (gimple_has_body_p (node->clone_of->decl)) | |
2324 | { | |
2325 | if (cgraph_dump_file) | |
e20422ea | 2326 | { |
2327 | fprintf (cgraph_dump_file, "clonning %s to %s\n", | |
2328 | cgraph_node_name (node->clone_of), | |
2329 | cgraph_node_name (node)); | |
2330 | if (node->clone.tree_map) | |
2331 | { | |
2332 | unsigned int i; | |
2333 | fprintf (cgraph_dump_file, " replace map: "); | |
2334 | for (i = 0; i < VEC_length (ipa_replace_map_p, | |
2335 | node->clone.tree_map); | |
2336 | i++) | |
2337 | { | |
2338 | struct ipa_replace_map *replace_info; | |
2339 | replace_info = VEC_index (ipa_replace_map_p, | |
2340 | node->clone.tree_map, | |
2341 | i); | |
2342 | print_generic_expr (cgraph_dump_file, replace_info->old_tree, 0); | |
2343 | fprintf (cgraph_dump_file, " -> "); | |
2344 | print_generic_expr (cgraph_dump_file, replace_info->new_tree, 0); | |
2345 | fprintf (cgraph_dump_file, "%s%s;", | |
2346 | replace_info->replace_p ? "(replace)":"", | |
2347 | replace_info->ref_p ? "(ref)":""); | |
2348 | } | |
2349 | fprintf (cgraph_dump_file, "\n"); | |
2350 | } | |
2351 | if (node->clone.args_to_skip) | |
2352 | { | |
2353 | fprintf (cgraph_dump_file, " args_to_skip: "); | |
2354 | dump_bitmap (cgraph_dump_file, node->clone.args_to_skip); | |
2355 | } | |
2356 | if (node->clone.args_to_skip) | |
2357 | { | |
2358 | fprintf (cgraph_dump_file, " combined_args_to_skip:"); | |
2359 | dump_bitmap (cgraph_dump_file, node->clone.combined_args_to_skip); | |
2360 | } | |
2361 | } | |
ccf4ab6b | 2362 | cgraph_materialize_clone (node); |
a510bd8d | 2363 | stabilized = false; |
ccf4ab6b | 2364 | } |
ccf4ab6b | 2365 | } |
2366 | } | |
2367 | } | |
ee3f5fc0 | 2368 | for (node = cgraph_nodes; node; node = node->next) |
2369 | if (!node->analyzed && node->callees) | |
2370 | cgraph_node_remove_callees (node); | |
c596d830 | 2371 | if (cgraph_dump_file) |
2372 | fprintf (cgraph_dump_file, "Materialization Call site updates done.\n"); | |
947781ac | 2373 | #ifdef ENABLE_CHECKING |
2374 | verify_cgraph (); | |
2375 | #endif | |
ccf4ab6b | 2376 | cgraph_remove_unreachable_nodes (false, cgraph_dump_file); |
2377 | } | |
2378 | ||
a861fe52 | 2379 | #include "gt-cgraphunit.h" |