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da5e1e7c | 1 | /* Driver of optimization process |
711789cc | 2 | Copyright (C) 2003-2013 Free Software Foundation, Inc. |
ae01b312 | 3 | Contributed by Jan Hubicka |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 9 | Software Foundation; either version 3, or (at your option) any later |
ae01b312 | 10 | version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
ae01b312 | 20 | |
da5e1e7c | 21 | /* This module implements main driver of compilation process. |
b0cdf642 | 22 | |
23 | The main scope of this file is to act as an interface in between | |
da5e1e7c | 24 | tree based frontends and the backend. |
b0cdf642 | 25 | |
26 | The front-end is supposed to use following functionality: | |
27 | ||
28 | - cgraph_finalize_function | |
29 | ||
30 | This function is called once front-end has parsed whole body of function | |
31 | and it is certain that the function body nor the declaration will change. | |
32 | ||
b326746d | 33 | (There is one exception needed for implementing GCC extern inline |
34 | function.) | |
b0cdf642 | 35 | |
a2d67028 | 36 | - varpool_finalize_decl |
b0cdf642 | 37 | |
7bd28bba | 38 | This function has same behavior as the above but is used for static |
b0cdf642 | 39 | variables. |
40 | ||
cf951b1a | 41 | - add_asm_node |
42 | ||
43 | Insert new toplevel ASM statement | |
44 | ||
45 | - finalize_compilation_unit | |
b0cdf642 | 46 | |
b326746d | 47 | This function is called once (source level) compilation unit is finalized |
48 | and it will no longer change. | |
b0cdf642 | 49 | |
da5e1e7c | 50 | The symbol table is constructed starting from the trivially needed |
51 | symbols finalized by the frontend. Functions are lowered into | |
52 | GIMPLE representation and callgraph/reference lists are constructed. | |
9d75589a | 53 | Those are used to discover other necessary functions and variables. |
da5e1e7c | 54 | |
55 | At the end the bodies of unreachable functions are removed. | |
b0cdf642 | 56 | |
b326746d | 57 | The function can be called multiple times when multiple source level |
da5e1e7c | 58 | compilation units are combined. |
b0cdf642 | 59 | |
cf951b1a | 60 | - compile |
b0cdf642 | 61 | |
da5e1e7c | 62 | This passes control to the back-end. Optimizations are performed and |
63 | final assembler is generated. This is done in the following way. Note | |
64 | that with link time optimization the process is split into three | |
65 | stages (compile time, linktime analysis and parallel linktime as | |
66 | indicated bellow). | |
67 | ||
68 | Compile time: | |
69 | ||
70 | 1) Inter-procedural optimization. | |
71 | (ipa_passes) | |
72 | ||
73 | This part is further split into: | |
74 | ||
75 | a) early optimizations. These are local passes executed in | |
76 | the topological order on the callgraph. | |
77 | ||
78 | The purpose of early optimiations is to optimize away simple | |
79 | things that may otherwise confuse IP analysis. Very simple | |
80 | propagation across the callgraph is done i.e. to discover | |
81 | functions without side effects and simple inlining is performed. | |
82 | ||
83 | b) early small interprocedural passes. | |
84 | ||
85 | Those are interprocedural passes executed only at compilation | |
a04e8d62 | 86 | time. These include, for example, transational memory lowering, |
da5e1e7c | 87 | unreachable code removal and other simple transformations. |
88 | ||
89 | c) IP analysis stage. All interprocedural passes do their | |
90 | analysis. | |
91 | ||
92 | Interprocedural passes differ from small interprocedural | |
93 | passes by their ability to operate across whole program | |
94 | at linktime. Their analysis stage is performed early to | |
95 | both reduce linking times and linktime memory usage by | |
96 | not having to represent whole program in memory. | |
97 | ||
98 | d) LTO sreaming. When doing LTO, everything important gets | |
99 | streamed into the object file. | |
100 | ||
101 | Compile time and or linktime analysis stage (WPA): | |
102 | ||
103 | At linktime units gets streamed back and symbol table is | |
104 | merged. Function bodies are not streamed in and not | |
105 | available. | |
106 | e) IP propagation stage. All IP passes execute their | |
107 | IP propagation. This is done based on the earlier analysis | |
108 | without having function bodies at hand. | |
109 | f) Ltrans streaming. When doing WHOPR LTO, the program | |
110 | is partitioned and streamed into multple object files. | |
b0cdf642 | 111 | |
da5e1e7c | 112 | Compile time and/or parallel linktime stage (ltrans) |
b0cdf642 | 113 | |
da5e1e7c | 114 | Each of the object files is streamed back and compiled |
115 | separately. Now the function bodies becomes available | |
116 | again. | |
b0cdf642 | 117 | |
da5e1e7c | 118 | 2) Virtual clone materialization |
119 | (cgraph_materialize_clone) | |
b0cdf642 | 120 | |
da5e1e7c | 121 | IP passes can produce copies of existing functoins (such |
122 | as versioned clones or inline clones) without actually | |
123 | manipulating their bodies by creating virtual clones in | |
124 | the callgraph. At this time the virtual clones are | |
125 | turned into real functions | |
126 | 3) IP transformation | |
b0cdf642 | 127 | |
da5e1e7c | 128 | All IP passes transform function bodies based on earlier |
129 | decision of the IP propagation. | |
b0cdf642 | 130 | |
da5e1e7c | 131 | 4) late small IP passes |
b0cdf642 | 132 | |
da5e1e7c | 133 | Simple IP passes working within single program partition. |
b0cdf642 | 134 | |
da5e1e7c | 135 | 5) Expansion |
cf951b1a | 136 | (expand_all_functions) |
b0cdf642 | 137 | |
da5e1e7c | 138 | At this stage functions that needs to be output into |
139 | assembler are identified and compiled in topological order | |
140 | 6) Output of variables and aliases | |
141 | Now it is known what variable references was not optimized | |
142 | out and thus all variables are output to the file. | |
b0cdf642 | 143 | |
da5e1e7c | 144 | Note that with -fno-toplevel-reorder passes 5 and 6 |
145 | are combined together in cgraph_output_in_order. | |
b0cdf642 | 146 | |
da5e1e7c | 147 | Finally there are functions to manipulate the callgraph from |
148 | backend. | |
149 | - cgraph_add_new_function is used to add backend produced | |
150 | functions introduced after the unit is finalized. | |
151 | The functions are enqueue for later processing and inserted | |
152 | into callgraph with cgraph_process_new_functions. | |
121f3051 | 153 | |
da5e1e7c | 154 | - cgraph_function_versioning |
155 | ||
156 | produces a copy of function into new one (a version) | |
157 | and apply simple transformations | |
158 | */ | |
acc70efa | 159 | |
ae01b312 | 160 | #include "config.h" |
161 | #include "system.h" | |
162 | #include "coretypes.h" | |
163 | #include "tm.h" | |
164 | #include "tree.h" | |
941366fd | 165 | #include "output.h" |
b5530559 | 166 | #include "rtl.h" |
acc70efa | 167 | #include "tree-flow.h" |
ae01b312 | 168 | #include "tree-inline.h" |
169 | #include "langhooks.h" | |
c6224531 | 170 | #include "pointer-set.h" |
ae01b312 | 171 | #include "toplev.h" |
172 | #include "flags.h" | |
173 | #include "ggc.h" | |
174 | #include "debug.h" | |
175 | #include "target.h" | |
176 | #include "cgraph.h" | |
80a85d8a | 177 | #include "diagnostic.h" |
d7c6d889 | 178 | #include "params.h" |
179 | #include "fibheap.h" | |
611e5405 | 180 | #include "intl.h" |
b69eb0ff | 181 | #include "function.h" |
b5d36404 | 182 | #include "ipa-prop.h" |
75a70cf9 | 183 | #include "gimple.h" |
184 | #include "tree-iterator.h" | |
f1e2a033 | 185 | #include "tree-pass.h" |
bfec3452 | 186 | #include "tree-dump.h" |
da5e1e7c | 187 | #include "gimple-pretty-print.h" |
c1dcd13c | 188 | #include "output.h" |
9ed5b1f5 | 189 | #include "coverage.h" |
c9036234 | 190 | #include "plugin.h" |
a41f2a28 | 191 | #include "ipa-inline.h" |
7771d558 | 192 | #include "ipa-utils.h" |
a0605d65 | 193 | #include "lto-streamer.h" |
3db65b62 | 194 | #include "except.h" |
7eacb0dd | 195 | #include "cfgloop.h" |
941366fd | 196 | #include "regset.h" /* FIXME: For reg_obstack. */ |
3ea50c01 | 197 | #include "context.h" |
198 | #include "pass_manager.h" | |
d7c6d889 | 199 | |
ff2a5ada | 200 | /* Queue of cgraph nodes scheduled to be added into cgraph. This is a |
201 | secondary queue used during optimization to accommodate passes that | |
202 | may generate new functions that need to be optimized and expanded. */ | |
203 | cgraph_node_set cgraph_new_nodes; | |
204 | ||
cf951b1a | 205 | static void expand_all_functions (void); |
206 | static void mark_functions_to_output (void); | |
207 | static void expand_function (struct cgraph_node *); | |
15ca8f90 | 208 | static void analyze_function (struct cgraph_node *); |
18a71d50 | 209 | static void handle_alias_pairs (void); |
25bb88de | 210 | |
ecb08119 | 211 | FILE *cgraph_dump_file; |
121f3051 | 212 | |
cf951b1a | 213 | /* Linked list of cgraph asm nodes. */ |
214 | struct asm_node *asm_nodes; | |
215 | ||
216 | /* Last node in cgraph_asm_nodes. */ | |
217 | static GTY(()) struct asm_node *asm_last_node; | |
218 | ||
28454517 | 219 | /* Used for vtable lookup in thunk adjusting. */ |
220 | static GTY (()) tree vtable_entry_type; | |
221 | ||
6a1c0403 | 222 | /* Determine if symbol DECL is needed. That is, visible to something |
223 | either outside this translation unit, something magic in the system | |
224 | configury */ | |
225 | bool | |
226 | decide_is_symbol_needed (symtab_node node) | |
2c0b522d | 227 | { |
6a1c0403 | 228 | tree decl = node->symbol.decl; |
05806473 | 229 | |
8efa224a | 230 | /* Double check that no one output the function into assembly file |
231 | early. */ | |
232 | gcc_checking_assert (!DECL_ASSEMBLER_NAME_SET_P (decl) | |
48669653 | 233 | || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))); |
3f82b628 | 234 | |
6a1c0403 | 235 | if (!node->symbol.definition) |
236 | return false; | |
55680bef | 237 | |
6a1c0403 | 238 | if (DECL_EXTERNAL (decl)) |
239 | return false; | |
8baa9d15 | 240 | |
6a1c0403 | 241 | /* If the user told us it is used, then it must be so. */ |
242 | if (node->symbol.force_output) | |
243 | return true; | |
244 | ||
245 | /* ABI forced symbols are needed when they are external. */ | |
246 | if (node->symbol.forced_by_abi && TREE_PUBLIC (decl)) | |
247 | return true; | |
248 | ||
249 | /* Keep constructors, destructors and virtual functions. */ | |
250 | if (TREE_CODE (decl) == FUNCTION_DECL | |
251 | && (DECL_STATIC_CONSTRUCTOR (decl) || DECL_STATIC_DESTRUCTOR (decl))) | |
252 | return true; | |
253 | ||
254 | /* Externally visible variables must be output. The exception is | |
255 | COMDAT variables that must be output only when they are needed. */ | |
256 | if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) | |
2c0b522d | 257 | return true; |
258 | ||
2c0b522d | 259 | return false; |
260 | } | |
261 | ||
ff2a5ada | 262 | /* Head of the queue of nodes to be processed while building callgraph */ |
263 | ||
264 | static symtab_node first = (symtab_node)(void *)1; | |
265 | ||
266 | /* Add NODE to queue starting at FIRST. | |
267 | The queue is linked via AUX pointers and terminated by pointer to 1. */ | |
268 | ||
269 | static void | |
270 | enqueue_node (symtab_node node) | |
271 | { | |
272 | if (node->symbol.aux) | |
273 | return; | |
274 | gcc_checking_assert (first); | |
275 | node->symbol.aux = first; | |
276 | first = node; | |
277 | } | |
278 | ||
bdc40eb8 | 279 | /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these |
523c1122 | 280 | functions into callgraph in a way so they look like ordinary reachable |
281 | functions inserted into callgraph already at construction time. */ | |
282 | ||
283 | bool | |
284 | cgraph_process_new_functions (void) | |
285 | { | |
286 | bool output = false; | |
287 | tree fndecl; | |
288 | struct cgraph_node *node; | |
ff2a5ada | 289 | cgraph_node_set_iterator csi; |
523c1122 | 290 | |
ff2a5ada | 291 | if (!cgraph_new_nodes) |
292 | return false; | |
18a71d50 | 293 | handle_alias_pairs (); |
523c1122 | 294 | /* Note that this queue may grow as its being processed, as the new |
295 | functions may generate new ones. */ | |
ff2a5ada | 296 | for (csi = csi_start (cgraph_new_nodes); !csi_end_p (csi); csi_next (&csi)) |
523c1122 | 297 | { |
ff2a5ada | 298 | node = csi_node (csi); |
7d0d0ce1 | 299 | fndecl = node->symbol.decl; |
523c1122 | 300 | switch (cgraph_state) |
301 | { | |
302 | case CGRAPH_STATE_CONSTRUCTION: | |
303 | /* At construction time we just need to finalize function and move | |
304 | it into reachable functions list. */ | |
305 | ||
523c1122 | 306 | cgraph_finalize_function (fndecl, false); |
523c1122 | 307 | output = true; |
4f7a1122 | 308 | cgraph_call_function_insertion_hooks (node); |
ff2a5ada | 309 | enqueue_node ((symtab_node) node); |
523c1122 | 310 | break; |
311 | ||
312 | case CGRAPH_STATE_IPA: | |
f517b36e | 313 | case CGRAPH_STATE_IPA_SSA: |
523c1122 | 314 | /* When IPA optimization already started, do all essential |
315 | transformations that has been already performed on the whole | |
316 | cgraph but not on this function. */ | |
317 | ||
75a70cf9 | 318 | gimple_register_cfg_hooks (); |
15ca8f90 | 319 | if (!node->symbol.analyzed) |
320 | analyze_function (node); | |
523c1122 | 321 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); |
f2c6b33f | 322 | if (cgraph_state == CGRAPH_STATE_IPA_SSA |
f517b36e | 323 | && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) |
bcfddb5b | 324 | g->get_passes ()->execute_early_local_passes (); |
f2c6b33f | 325 | else if (inline_summary_vec != NULL) |
a41f2a28 | 326 | compute_inline_parameters (node, true); |
523c1122 | 327 | free_dominance_info (CDI_POST_DOMINATORS); |
328 | free_dominance_info (CDI_DOMINATORS); | |
329 | pop_cfun (); | |
4f7a1122 | 330 | cgraph_call_function_insertion_hooks (node); |
523c1122 | 331 | break; |
332 | ||
333 | case CGRAPH_STATE_EXPANSION: | |
334 | /* Functions created during expansion shall be compiled | |
335 | directly. */ | |
09fc9532 | 336 | node->process = 0; |
4f7a1122 | 337 | cgraph_call_function_insertion_hooks (node); |
cf951b1a | 338 | expand_function (node); |
523c1122 | 339 | break; |
340 | ||
341 | default: | |
342 | gcc_unreachable (); | |
343 | break; | |
344 | } | |
345 | } | |
ff2a5ada | 346 | free_cgraph_node_set (cgraph_new_nodes); |
347 | cgraph_new_nodes = NULL; | |
523c1122 | 348 | return output; |
349 | } | |
350 | ||
9b8fb23a | 351 | /* As an GCC extension we allow redefinition of the function. The |
352 | semantics when both copies of bodies differ is not well defined. | |
353 | We replace the old body with new body so in unit at a time mode | |
354 | we always use new body, while in normal mode we may end up with | |
355 | old body inlined into some functions and new body expanded and | |
356 | inlined in others. | |
357 | ||
358 | ??? It may make more sense to use one body for inlining and other | |
359 | body for expanding the function but this is difficult to do. */ | |
360 | ||
15ca8f90 | 361 | void |
9b8fb23a | 362 | cgraph_reset_node (struct cgraph_node *node) |
363 | { | |
09fc9532 | 364 | /* If node->process is set, then we have already begun whole-unit analysis. |
6329636b | 365 | This is *not* testing for whether we've already emitted the function. |
366 | That case can be sort-of legitimately seen with real function redefinition | |
367 | errors. I would argue that the front end should never present us with | |
368 | such a case, but don't enforce that for now. */ | |
09fc9532 | 369 | gcc_assert (!node->process); |
9b8fb23a | 370 | |
371 | /* Reset our data structures so we can analyze the function again. */ | |
372 | memset (&node->local, 0, sizeof (node->local)); | |
373 | memset (&node->global, 0, sizeof (node->global)); | |
374 | memset (&node->rtl, 0, sizeof (node->rtl)); | |
15ca8f90 | 375 | node->symbol.analyzed = false; |
376 | node->symbol.definition = false; | |
48669653 | 377 | node->symbol.alias = false; |
f2526cce | 378 | node->symbol.weakref = false; |
48669653 | 379 | node->symbol.cpp_implicit_alias = false; |
9b8fb23a | 380 | |
9b8fb23a | 381 | cgraph_node_remove_callees (node); |
15ca8f90 | 382 | ipa_remove_all_references (&node->symbol.ref_list); |
9b8fb23a | 383 | } |
c08871a9 | 384 | |
9a2639fc | 385 | /* Return true when there are references to NODE. */ |
386 | ||
387 | static bool | |
388 | referred_to_p (symtab_node node) | |
389 | { | |
9a2639fc | 390 | struct ipa_ref *ref; |
391 | ||
9d75589a | 392 | /* See if there are any references at all. */ |
cf951b1a | 393 | if (ipa_ref_list_referring_iterate (&node->symbol.ref_list, 0, ref)) |
9a2639fc | 394 | return true; |
cf951b1a | 395 | /* For functions check also calls. */ |
2dc9831f | 396 | cgraph_node *cn = dyn_cast <cgraph_node> (node); |
397 | if (cn && cn->callers) | |
9a2639fc | 398 | return true; |
399 | return false; | |
400 | } | |
401 | ||
28df663b | 402 | /* DECL has been parsed. Take it, queue it, compile it at the whim of the |
1f7747bd | 403 | logic in effect. If NO_COLLECT is true, then our caller cannot stand to have |
28df663b | 404 | the garbage collector run at the moment. We would need to either create |
405 | a new GC context, or just not compile right now. */ | |
ae01b312 | 406 | |
407 | void | |
1f7747bd | 408 | cgraph_finalize_function (tree decl, bool no_collect) |
ae01b312 | 409 | { |
5a90471f | 410 | struct cgraph_node *node = cgraph_get_create_node (decl); |
ae01b312 | 411 | |
15ca8f90 | 412 | if (node->symbol.definition) |
443089c1 | 413 | { |
1f7747bd | 414 | /* Nested functions should only be defined once. */ |
415 | gcc_assert (!DECL_CONTEXT (decl) | |
416 | || TREE_CODE (DECL_CONTEXT (decl)) != FUNCTION_DECL); | |
443089c1 | 417 | cgraph_reset_node (node); |
418 | node->local.redefined_extern_inline = true; | |
419 | } | |
28df663b | 420 | |
c08871a9 | 421 | notice_global_symbol (decl); |
15ca8f90 | 422 | node->symbol.definition = true; |
e27482aa | 423 | node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL; |
ae01b312 | 424 | |
8efa224a | 425 | /* With -fkeep-inline-functions we are keeping all inline functions except |
426 | for extern inline ones. */ | |
427 | if (flag_keep_inline_functions | |
428 | && DECL_DECLARED_INLINE_P (decl) | |
429 | && !DECL_EXTERNAL (decl) | |
430 | && !DECL_DISREGARD_INLINE_LIMITS (decl)) | |
431 | node->symbol.force_output = 1; | |
2c0b522d | 432 | |
8efa224a | 433 | /* When not optimizing, also output the static functions. (see |
434 | PR24561), but don't do so for always_inline functions, functions | |
435 | declared inline and nested functions. These were optimized out | |
436 | in the original implementation and it is unclear whether we want | |
437 | to change the behavior here. */ | |
438 | if ((!optimize | |
48669653 | 439 | && !node->symbol.cpp_implicit_alias |
8efa224a | 440 | && !DECL_DISREGARD_INLINE_LIMITS (decl) |
441 | && !DECL_DECLARED_INLINE_P (decl) | |
442 | && !(DECL_CONTEXT (decl) | |
443 | && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)) | |
444 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) | |
445 | node->symbol.force_output = 1; | |
446 | ||
2c0b522d | 447 | /* If we've not yet emitted decl, tell the debug info about it. */ |
28df663b | 448 | if (!TREE_ASM_WRITTEN (decl)) |
2c0b522d | 449 | (*debug_hooks->deferred_inline_function) (decl); |
4e8871a0 | 450 | |
b69eb0ff | 451 | /* Possibly warn about unused parameters. */ |
452 | if (warn_unused_parameter) | |
453 | do_warn_unused_parameter (decl); | |
6329636b | 454 | |
1f7747bd | 455 | if (!no_collect) |
6329636b | 456 | ggc_collect (); |
9a2639fc | 457 | |
458 | if (cgraph_state == CGRAPH_STATE_CONSTRUCTION | |
6a1c0403 | 459 | && (decide_is_symbol_needed ((symtab_node) node) |
9a2639fc | 460 | || referred_to_p ((symtab_node)node))) |
461 | enqueue_node ((symtab_node)node); | |
ae01b312 | 462 | } |
463 | ||
3db65b62 | 464 | /* Add the function FNDECL to the call graph. |
465 | Unlike cgraph_finalize_function, this function is intended to be used | |
466 | by middle end and allows insertion of new function at arbitrary point | |
467 | of compilation. The function can be either in high, low or SSA form | |
468 | GIMPLE. | |
469 | ||
470 | The function is assumed to be reachable and have address taken (so no | |
471 | API breaking optimizations are performed on it). | |
472 | ||
473 | Main work done by this function is to enqueue the function for later | |
474 | processing to avoid need the passes to be re-entrant. */ | |
475 | ||
476 | void | |
477 | cgraph_add_new_function (tree fndecl, bool lowered) | |
478 | { | |
3ea50c01 | 479 | gcc::pass_manager *passes = g->get_passes (); |
3db65b62 | 480 | struct cgraph_node *node; |
481 | switch (cgraph_state) | |
482 | { | |
ff2a5ada | 483 | case CGRAPH_STATE_PARSING: |
484 | cgraph_finalize_function (fndecl, false); | |
485 | break; | |
3db65b62 | 486 | case CGRAPH_STATE_CONSTRUCTION: |
487 | /* Just enqueue function to be processed at nearest occurrence. */ | |
488 | node = cgraph_create_node (fndecl); | |
3db65b62 | 489 | if (lowered) |
490 | node->lowered = true; | |
ff2a5ada | 491 | if (!cgraph_new_nodes) |
492 | cgraph_new_nodes = cgraph_node_set_new (); | |
493 | cgraph_node_set_add (cgraph_new_nodes, node); | |
3db65b62 | 494 | break; |
495 | ||
496 | case CGRAPH_STATE_IPA: | |
497 | case CGRAPH_STATE_IPA_SSA: | |
498 | case CGRAPH_STATE_EXPANSION: | |
499 | /* Bring the function into finalized state and enqueue for later | |
500 | analyzing and compilation. */ | |
501 | node = cgraph_get_create_node (fndecl); | |
502 | node->local.local = false; | |
15ca8f90 | 503 | node->symbol.definition = true; |
da751785 | 504 | node->symbol.force_output = true; |
3db65b62 | 505 | if (!lowered && cgraph_state == CGRAPH_STATE_EXPANSION) |
506 | { | |
507 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
3db65b62 | 508 | gimple_register_cfg_hooks (); |
509 | bitmap_obstack_initialize (NULL); | |
3ea50c01 | 510 | execute_pass_list (passes->all_lowering_passes); |
bcfddb5b | 511 | passes->execute_early_local_passes (); |
3db65b62 | 512 | bitmap_obstack_release (NULL); |
513 | pop_cfun (); | |
3db65b62 | 514 | |
515 | lowered = true; | |
516 | } | |
517 | if (lowered) | |
518 | node->lowered = true; | |
ff2a5ada | 519 | if (!cgraph_new_nodes) |
520 | cgraph_new_nodes = cgraph_node_set_new (); | |
521 | cgraph_node_set_add (cgraph_new_nodes, node); | |
3db65b62 | 522 | break; |
523 | ||
524 | case CGRAPH_STATE_FINISHED: | |
525 | /* At the very end of compilation we have to do all the work up | |
526 | to expansion. */ | |
527 | node = cgraph_create_node (fndecl); | |
528 | if (lowered) | |
529 | node->lowered = true; | |
15ca8f90 | 530 | node->symbol.definition = true; |
531 | analyze_function (node); | |
3db65b62 | 532 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); |
3db65b62 | 533 | gimple_register_cfg_hooks (); |
534 | bitmap_obstack_initialize (NULL); | |
535 | if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
bcfddb5b | 536 | g->get_passes ()->execute_early_local_passes (); |
3db65b62 | 537 | bitmap_obstack_release (NULL); |
3db65b62 | 538 | pop_cfun (); |
cf951b1a | 539 | expand_function (node); |
3db65b62 | 540 | break; |
541 | ||
542 | default: | |
543 | gcc_unreachable (); | |
544 | } | |
545 | ||
546 | /* Set a personality if required and we already passed EH lowering. */ | |
547 | if (lowered | |
548 | && (function_needs_eh_personality (DECL_STRUCT_FUNCTION (fndecl)) | |
549 | == eh_personality_lang)) | |
550 | DECL_FUNCTION_PERSONALITY (fndecl) = lang_hooks.eh_personality (); | |
551 | } | |
552 | ||
cf951b1a | 553 | /* Add a top-level asm statement to the list. */ |
554 | ||
555 | struct asm_node * | |
556 | add_asm_node (tree asm_str) | |
557 | { | |
558 | struct asm_node *node; | |
559 | ||
560 | node = ggc_alloc_cleared_asm_node (); | |
561 | node->asm_str = asm_str; | |
562 | node->order = symtab_order++; | |
563 | node->next = NULL; | |
564 | if (asm_nodes == NULL) | |
565 | asm_nodes = node; | |
566 | else | |
567 | asm_last_node->next = node; | |
568 | asm_last_node = node; | |
569 | return node; | |
570 | } | |
571 | ||
56af936e | 572 | /* Output all asm statements we have stored up to be output. */ |
573 | ||
574 | static void | |
cf951b1a | 575 | output_asm_statements (void) |
56af936e | 576 | { |
cf951b1a | 577 | struct asm_node *can; |
56af936e | 578 | |
852f689e | 579 | if (seen_error ()) |
56af936e | 580 | return; |
581 | ||
cf951b1a | 582 | for (can = asm_nodes; can; can = can->next) |
56af936e | 583 | assemble_asm (can->asm_str); |
cf951b1a | 584 | asm_nodes = NULL; |
585 | } | |
586 | ||
0785e435 | 587 | /* Analyze the function scheduled to be output. */ |
da5e1e7c | 588 | static void |
15ca8f90 | 589 | analyze_function (struct cgraph_node *node) |
0785e435 | 590 | { |
7d0d0ce1 | 591 | tree decl = node->symbol.decl; |
da5e1e7c | 592 | location_t saved_loc = input_location; |
593 | input_location = DECL_SOURCE_LOCATION (decl); | |
0785e435 | 594 | |
48669653 | 595 | if (node->symbol.alias) |
596 | symtab_resolve_alias | |
597 | ((symtab_node) node, (symtab_node) cgraph_get_node (node->symbol.alias_target)); | |
c70f46b0 | 598 | else if (node->thunk.thunk_p) |
91bf9d9a | 599 | { |
600 | cgraph_create_edge (node, cgraph_get_node (node->thunk.alias), | |
601 | NULL, 0, CGRAPH_FREQ_BASE); | |
48669653 | 602 | node->thunk.alias = NULL; |
91bf9d9a | 603 | } |
cc8ef84f | 604 | else if (node->dispatcher_function) |
605 | { | |
606 | /* Generate the dispatcher body of multi-versioned functions. */ | |
607 | struct cgraph_function_version_info *dispatcher_version_info | |
608 | = get_cgraph_node_version (node); | |
609 | if (dispatcher_version_info != NULL | |
610 | && (dispatcher_version_info->dispatcher_resolver | |
611 | == NULL_TREE)) | |
612 | { | |
613 | tree resolver = NULL_TREE; | |
614 | gcc_assert (targetm.generate_version_dispatcher_body); | |
615 | resolver = targetm.generate_version_dispatcher_body (node); | |
616 | gcc_assert (resolver != NULL_TREE); | |
617 | } | |
618 | } | |
91bf9d9a | 619 | else |
620 | { | |
91bf9d9a | 621 | push_cfun (DECL_STRUCT_FUNCTION (decl)); |
bfec3452 | 622 | |
7d0d0ce1 | 623 | assign_assembler_name_if_neeeded (node->symbol.decl); |
6816d0c4 | 624 | |
91bf9d9a | 625 | /* Make sure to gimplify bodies only once. During analyzing a |
626 | function we lower it, which will require gimplified nested | |
627 | functions, so we can end up here with an already gimplified | |
628 | body. */ | |
e3a19533 | 629 | if (!gimple_has_body_p (decl)) |
91bf9d9a | 630 | gimplify_function_tree (decl); |
631 | dump_function (TDI_generic, decl); | |
bfec3452 | 632 | |
47199071 | 633 | /* Lower the function. */ |
634 | if (!node->lowered) | |
635 | { | |
636 | if (node->nested) | |
7d0d0ce1 | 637 | lower_nested_functions (node->symbol.decl); |
47199071 | 638 | gcc_assert (!node->nested); |
639 | ||
640 | gimple_register_cfg_hooks (); | |
641 | bitmap_obstack_initialize (NULL); | |
3ea50c01 | 642 | execute_pass_list (g->get_passes ()->all_lowering_passes); |
47199071 | 643 | free_dominance_info (CDI_POST_DOMINATORS); |
644 | free_dominance_info (CDI_DOMINATORS); | |
645 | compact_blocks (); | |
646 | bitmap_obstack_release (NULL); | |
647 | node->lowered = true; | |
648 | } | |
649 | ||
91bf9d9a | 650 | pop_cfun (); |
651 | } | |
15ca8f90 | 652 | node->symbol.analyzed = true; |
0785e435 | 653 | |
da5e1e7c | 654 | input_location = saved_loc; |
0785e435 | 655 | } |
656 | ||
c70f46b0 | 657 | /* C++ frontend produce same body aliases all over the place, even before PCH |
658 | gets streamed out. It relies on us linking the aliases with their function | |
659 | in order to do the fixups, but ipa-ref is not PCH safe. Consequentely we | |
660 | first produce aliases without links, but once C++ FE is sure he won't sream | |
661 | PCH we build the links via this function. */ | |
662 | ||
663 | void | |
664 | cgraph_process_same_body_aliases (void) | |
665 | { | |
48669653 | 666 | symtab_node node; |
667 | FOR_EACH_SYMBOL (node) | |
668 | if (node->symbol.cpp_implicit_alias && !node->symbol.analyzed) | |
a55453ec | 669 | symtab_resolve_alias |
670 | (node, | |
671 | TREE_CODE (node->symbol.alias_target) == VAR_DECL | |
672 | ? (symtab_node)varpool_node_for_decl (node->symbol.alias_target) | |
673 | : (symtab_node)cgraph_get_create_node (node->symbol.alias_target)); | |
48669653 | 674 | cpp_implicit_aliases_done = true; |
c70f46b0 | 675 | } |
676 | ||
d05db70d | 677 | /* Process attributes common for vars and functions. */ |
678 | ||
679 | static void | |
680 | process_common_attributes (tree decl) | |
681 | { | |
682 | tree weakref = lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)); | |
683 | ||
684 | if (weakref && !lookup_attribute ("alias", DECL_ATTRIBUTES (decl))) | |
685 | { | |
686 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
687 | "%<weakref%> attribute should be accompanied with" | |
688 | " an %<alias%> attribute"); | |
689 | DECL_WEAK (decl) = 0; | |
40b32d93 | 690 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", |
691 | DECL_ATTRIBUTES (decl)); | |
d05db70d | 692 | } |
693 | } | |
694 | ||
05806473 | 695 | /* Look for externally_visible and used attributes and mark cgraph nodes |
696 | accordingly. | |
697 | ||
698 | We cannot mark the nodes at the point the attributes are processed (in | |
699 | handle_*_attribute) because the copy of the declarations available at that | |
700 | point may not be canonical. For example, in: | |
701 | ||
702 | void f(); | |
703 | void f() __attribute__((used)); | |
704 | ||
705 | the declaration we see in handle_used_attribute will be the second | |
706 | declaration -- but the front end will subsequently merge that declaration | |
707 | with the original declaration and discard the second declaration. | |
708 | ||
709 | Furthermore, we can't mark these nodes in cgraph_finalize_function because: | |
710 | ||
711 | void f() {} | |
712 | void f() __attribute__((externally_visible)); | |
713 | ||
714 | is valid. | |
715 | ||
716 | So, we walk the nodes at the end of the translation unit, applying the | |
717 | attributes at that point. */ | |
718 | ||
719 | static void | |
720 | process_function_and_variable_attributes (struct cgraph_node *first, | |
1d416bd7 | 721 | struct varpool_node *first_var) |
05806473 | 722 | { |
723 | struct cgraph_node *node; | |
1d416bd7 | 724 | struct varpool_node *vnode; |
05806473 | 725 | |
0704fb2e | 726 | for (node = cgraph_first_function (); node != first; |
727 | node = cgraph_next_function (node)) | |
05806473 | 728 | { |
7d0d0ce1 | 729 | tree decl = node->symbol.decl; |
83a23b05 | 730 | if (DECL_PRESERVE_P (decl)) |
8efa224a | 731 | cgraph_mark_force_output_node (node); |
62433d51 | 732 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
05806473 | 733 | { |
7d0d0ce1 | 734 | if (! TREE_PUBLIC (node->symbol.decl)) |
735 | warning_at (DECL_SOURCE_LOCATION (node->symbol.decl), OPT_Wattributes, | |
712d2297 | 736 | "%<externally_visible%>" |
737 | " attribute have effect only on public objects"); | |
05806473 | 738 | } |
40b32d93 | 739 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
15ca8f90 | 740 | && (node->symbol.definition && !node->symbol.alias)) |
40b32d93 | 741 | { |
7d0d0ce1 | 742 | warning_at (DECL_SOURCE_LOCATION (node->symbol.decl), OPT_Wattributes, |
40b32d93 | 743 | "%<weakref%> attribute ignored" |
744 | " because function is defined"); | |
745 | DECL_WEAK (decl) = 0; | |
746 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
747 | DECL_ATTRIBUTES (decl)); | |
748 | } | |
a522e9eb | 749 | |
750 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl)) | |
751 | && !DECL_DECLARED_INLINE_P (decl) | |
752 | /* redefining extern inline function makes it DECL_UNINLINABLE. */ | |
753 | && !DECL_UNINLINABLE (decl)) | |
754 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
755 | "always_inline function might not be inlinable"); | |
756 | ||
d05db70d | 757 | process_common_attributes (decl); |
05806473 | 758 | } |
0704fb2e | 759 | for (vnode = varpool_first_variable (); vnode != first_var; |
760 | vnode = varpool_next_variable (vnode)) | |
05806473 | 761 | { |
7d0d0ce1 | 762 | tree decl = vnode->symbol.decl; |
aa419a52 | 763 | if (DECL_EXTERNAL (decl) |
df8d3e89 | 764 | && DECL_INITIAL (decl)) |
aa419a52 | 765 | varpool_finalize_decl (decl); |
83a23b05 | 766 | if (DECL_PRESERVE_P (decl)) |
ff2a5ada | 767 | vnode->symbol.force_output = true; |
62433d51 | 768 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
05806473 | 769 | { |
7d0d0ce1 | 770 | if (! TREE_PUBLIC (vnode->symbol.decl)) |
771 | warning_at (DECL_SOURCE_LOCATION (vnode->symbol.decl), OPT_Wattributes, | |
712d2297 | 772 | "%<externally_visible%>" |
773 | " attribute have effect only on public objects"); | |
05806473 | 774 | } |
40b32d93 | 775 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
15ca8f90 | 776 | && vnode->symbol.definition |
40b32d93 | 777 | && DECL_INITIAL (decl)) |
778 | { | |
7d0d0ce1 | 779 | warning_at (DECL_SOURCE_LOCATION (vnode->symbol.decl), OPT_Wattributes, |
40b32d93 | 780 | "%<weakref%> attribute ignored" |
781 | " because variable is initialized"); | |
782 | DECL_WEAK (decl) = 0; | |
783 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
784 | DECL_ATTRIBUTES (decl)); | |
785 | } | |
d05db70d | 786 | process_common_attributes (decl); |
05806473 | 787 | } |
788 | } | |
789 | ||
ff2a5ada | 790 | /* Mark DECL as finalized. By finalizing the declaration, frontend instruct the |
791 | middle end to output the variable to asm file, if needed or externally | |
792 | visible. */ | |
793 | ||
794 | void | |
795 | varpool_finalize_decl (tree decl) | |
796 | { | |
2dc9831f | 797 | struct varpool_node *node = varpool_node_for_decl (decl); |
ff2a5ada | 798 | |
2d4bf241 | 799 | gcc_assert (TREE_STATIC (decl) || DECL_EXTERNAL (decl)); |
ff2a5ada | 800 | |
15ca8f90 | 801 | if (node->symbol.definition) |
ff2a5ada | 802 | return; |
803 | notice_global_symbol (decl); | |
15ca8f90 | 804 | node->symbol.definition = true; |
ff2a5ada | 805 | if (TREE_THIS_VOLATILE (decl) || DECL_PRESERVE_P (decl) |
806 | /* Traditionally we do not eliminate static variables when not | |
807 | optimizing and when not doing toplevel reoder. */ | |
808 | || (!flag_toplevel_reorder && !DECL_COMDAT (node->symbol.decl) | |
809 | && !DECL_ARTIFICIAL (node->symbol.decl))) | |
810 | node->symbol.force_output = true; | |
811 | ||
812 | if (cgraph_state == CGRAPH_STATE_CONSTRUCTION | |
6a1c0403 | 813 | && (decide_is_symbol_needed ((symtab_node) node) |
ff2a5ada | 814 | || referred_to_p ((symtab_node)node))) |
815 | enqueue_node ((symtab_node)node); | |
816 | if (cgraph_state >= CGRAPH_STATE_IPA_SSA) | |
817 | varpool_analyze_node (node); | |
3d1c0354 | 818 | /* Some frontends produce various interface variables after compilation |
819 | finished. */ | |
820 | if (cgraph_state == CGRAPH_STATE_FINISHED) | |
821 | varpool_assemble_decl (node); | |
ff2a5ada | 822 | } |
823 | ||
2dc9831f | 824 | |
ff2a5ada | 825 | /* Discover all functions and variables that are trivially needed, analyze |
826 | them as well as all functions and variables referred by them */ | |
ae01b312 | 827 | |
aeeb194b | 828 | static void |
15ca8f90 | 829 | analyze_functions (void) |
ae01b312 | 830 | { |
c1dcd13c | 831 | /* Keep track of already processed nodes when called multiple times for |
06b27565 | 832 | intermodule optimization. */ |
c1dcd13c | 833 | static struct cgraph_node *first_analyzed; |
ff2a5ada | 834 | struct cgraph_node *first_handled = first_analyzed; |
1d416bd7 | 835 | static struct varpool_node *first_analyzed_var; |
ff2a5ada | 836 | struct varpool_node *first_handled_var = first_analyzed_var; |
5514adf9 | 837 | struct pointer_set_t *reachable_call_targets = pointer_set_create (); |
ff2a5ada | 838 | |
839 | symtab_node node, next; | |
840 | int i; | |
841 | struct ipa_ref *ref; | |
842 | bool changed = true; | |
ae01b312 | 843 | |
f1c35659 | 844 | bitmap_obstack_initialize (NULL); |
ff2a5ada | 845 | cgraph_state = CGRAPH_STATE_CONSTRUCTION; |
ae01b312 | 846 | |
48669653 | 847 | /* Ugly, but the fixup can not happen at a time same body alias is created; |
848 | C++ FE is confused about the COMDAT groups being right. */ | |
849 | if (cpp_implicit_aliases_done) | |
850 | FOR_EACH_SYMBOL (node) | |
851 | if (node->symbol.cpp_implicit_alias) | |
852 | fixup_same_cpp_alias_visibility (node, symtab_alias_target (node)); | |
5514adf9 | 853 | if (optimize && flag_devirtualize) |
854 | build_type_inheritance_graph (); | |
48669653 | 855 | |
ff2a5ada | 856 | /* Analysis adds static variables that in turn adds references to new functions. |
857 | So we need to iterate the process until it stabilize. */ | |
858 | while (changed) | |
ae01b312 | 859 | { |
ff2a5ada | 860 | changed = false; |
861 | process_function_and_variable_attributes (first_analyzed, | |
862 | first_analyzed_var); | |
863 | ||
864 | /* First identify the trivially needed symbols. */ | |
865 | for (node = symtab_nodes; | |
866 | node != (symtab_node)first_analyzed | |
867 | && node != (symtab_node)first_analyzed_var; node = node->symbol.next) | |
9b8fb23a | 868 | { |
6a1c0403 | 869 | if (decide_is_symbol_needed (node)) |
ff2a5ada | 870 | { |
871 | enqueue_node (node); | |
872 | if (!changed && cgraph_dump_file) | |
873 | fprintf (cgraph_dump_file, "Trivially needed symbols:"); | |
874 | changed = true; | |
875 | if (cgraph_dump_file) | |
876 | fprintf (cgraph_dump_file, " %s", symtab_node_asm_name (node)); | |
5514adf9 | 877 | if (!changed && cgraph_dump_file) |
878 | fprintf (cgraph_dump_file, "\n"); | |
ff2a5ada | 879 | } |
880 | if (node == (symtab_node)first_analyzed | |
881 | || node == (symtab_node)first_analyzed_var) | |
882 | break; | |
9b8fb23a | 883 | } |
ff2a5ada | 884 | cgraph_process_new_functions (); |
885 | first_analyzed_var = varpool_first_variable (); | |
886 | first_analyzed = cgraph_first_function (); | |
638531ad | 887 | |
ff2a5ada | 888 | if (changed && dump_file) |
889 | fprintf (cgraph_dump_file, "\n"); | |
2c0b522d | 890 | |
ff2a5ada | 891 | /* Lower representation, build callgraph edges and references for all trivially |
892 | needed symbols and all symbols referred by them. */ | |
893 | while (first != (symtab_node)(void *)1) | |
61c2c7b1 | 894 | { |
ff2a5ada | 895 | changed = true; |
896 | node = first; | |
897 | first = (symtab_node)first->symbol.aux; | |
2dc9831f | 898 | cgraph_node *cnode = dyn_cast <cgraph_node> (node); |
15ca8f90 | 899 | if (cnode && cnode->symbol.definition) |
ff2a5ada | 900 | { |
901 | struct cgraph_edge *edge; | |
2dc9831f | 902 | tree decl = cnode->symbol.decl; |
ff2a5ada | 903 | |
2dc9831f | 904 | /* ??? It is possible to create extern inline function |
905 | and later using weak alias attribute to kill its body. | |
906 | See gcc.c-torture/compile/20011119-1.c */ | |
ff2a5ada | 907 | if (!DECL_STRUCT_FUNCTION (decl) |
48669653 | 908 | && !cnode->symbol.alias |
cc8ef84f | 909 | && !cnode->thunk.thunk_p |
910 | && !cnode->dispatcher_function) | |
ff2a5ada | 911 | { |
912 | cgraph_reset_node (cnode); | |
913 | cnode->local.redefined_extern_inline = true; | |
914 | continue; | |
915 | } | |
61c2c7b1 | 916 | |
15ca8f90 | 917 | if (!cnode->symbol.analyzed) |
918 | analyze_function (cnode); | |
d544ceff | 919 | |
ff2a5ada | 920 | for (edge = cnode->callees; edge; edge = edge->next_callee) |
15ca8f90 | 921 | if (edge->callee->symbol.definition) |
2dc9831f | 922 | enqueue_node ((symtab_node)edge->callee); |
5514adf9 | 923 | if (optimize && flag_devirtualize) |
924 | { | |
925 | for (edge = cnode->indirect_calls; edge; edge = edge->next_callee) | |
926 | if (edge->indirect_info->polymorphic) | |
927 | { | |
928 | unsigned int i; | |
929 | void *cache_token; | |
930 | vec <cgraph_node *>targets | |
931 | = possible_polymorphic_call_targets | |
932 | (edge, NULL, &cache_token); | |
933 | ||
934 | if (!pointer_set_insert (reachable_call_targets, | |
935 | cache_token)) | |
936 | { | |
937 | if (cgraph_dump_file) | |
938 | dump_possible_polymorphic_call_targets | |
939 | (cgraph_dump_file, edge); | |
940 | ||
941 | for (i = 0; i < targets.length(); i++) | |
942 | enqueue_node ((symtab_node) targets[i]); | |
943 | } | |
944 | } | |
945 | } | |
ff2a5ada | 946 | |
2dc9831f | 947 | /* If decl is a clone of an abstract function, |
948 | mark that abstract function so that we don't release its body. | |
949 | The DECL_INITIAL() of that abstract function declaration | |
950 | will be later needed to output debug info. */ | |
ff2a5ada | 951 | if (DECL_ABSTRACT_ORIGIN (decl)) |
952 | { | |
2dc9831f | 953 | struct cgraph_node *origin_node |
954 | = cgraph_get_node (DECL_ABSTRACT_ORIGIN (decl)); | |
abb1a237 | 955 | origin_node->used_as_abstract_origin = true; |
ff2a5ada | 956 | } |
ff2a5ada | 957 | } |
2dc9831f | 958 | else |
959 | { | |
960 | varpool_node *vnode = dyn_cast <varpool_node> (node); | |
48669653 | 961 | if (vnode && vnode->symbol.definition && !vnode->symbol.analyzed) |
2dc9831f | 962 | varpool_analyze_node (vnode); |
963 | } | |
ff2a5ada | 964 | |
965 | if (node->symbol.same_comdat_group) | |
966 | { | |
967 | symtab_node next; | |
968 | for (next = node->symbol.same_comdat_group; | |
969 | next != node; | |
970 | next = next->symbol.same_comdat_group) | |
971 | enqueue_node (next); | |
972 | } | |
973 | for (i = 0; ipa_ref_list_reference_iterate (&node->symbol.ref_list, i, ref); i++) | |
15ca8f90 | 974 | if (ref->referred->symbol.definition) |
ff2a5ada | 975 | enqueue_node (ref->referred); |
976 | cgraph_process_new_functions (); | |
977 | } | |
ae01b312 | 978 | } |
2c0b522d | 979 | |
aa5e06c7 | 980 | /* Collect entry points to the unit. */ |
f79b6507 | 981 | if (cgraph_dump_file) |
3d7bfc56 | 982 | { |
e4200070 | 983 | fprintf (cgraph_dump_file, "\n\nInitial "); |
18841b0c | 984 | dump_symtab (cgraph_dump_file); |
3d7bfc56 | 985 | } |
e6d2b2d8 | 986 | |
f79b6507 | 987 | if (cgraph_dump_file) |
ff2a5ada | 988 | fprintf (cgraph_dump_file, "\nRemoving unused symbols:"); |
ae01b312 | 989 | |
ff2a5ada | 990 | for (node = symtab_nodes; |
991 | node != (symtab_node)first_handled | |
992 | && node != (symtab_node)first_handled_var; node = next) | |
ae01b312 | 993 | { |
ff2a5ada | 994 | next = node->symbol.next; |
995 | if (!node->symbol.aux && !referred_to_p (node)) | |
ae01b312 | 996 | { |
f79b6507 | 997 | if (cgraph_dump_file) |
ff2a5ada | 998 | fprintf (cgraph_dump_file, " %s", symtab_node_name (node)); |
999 | symtab_remove_node (node); | |
9b8fb23a | 1000 | continue; |
ae01b312 | 1001 | } |
2dc9831f | 1002 | if (cgraph_node *cnode = dyn_cast <cgraph_node> (node)) |
ff2a5ada | 1003 | { |
1004 | tree decl = node->symbol.decl; | |
ff2a5ada | 1005 | |
15ca8f90 | 1006 | if (cnode->symbol.definition && !gimple_has_body_p (decl) |
48669653 | 1007 | && !cnode->symbol.alias |
ff2a5ada | 1008 | && !cnode->thunk.thunk_p) |
1009 | cgraph_reset_node (cnode); | |
1010 | ||
15ca8f90 | 1011 | gcc_assert (!cnode->symbol.definition || cnode->thunk.thunk_p |
1012 | || cnode->symbol.alias | |
ff2a5ada | 1013 | || gimple_has_body_p (decl)); |
15ca8f90 | 1014 | gcc_assert (cnode->symbol.analyzed == cnode->symbol.definition); |
ff2a5ada | 1015 | } |
1016 | node->symbol.aux = NULL; | |
ae01b312 | 1017 | } |
ff2a5ada | 1018 | first_analyzed = cgraph_first_function (); |
1019 | first_analyzed_var = varpool_first_variable (); | |
f79b6507 | 1020 | if (cgraph_dump_file) |
e4200070 | 1021 | { |
1022 | fprintf (cgraph_dump_file, "\n\nReclaimed "); | |
18841b0c | 1023 | dump_symtab (cgraph_dump_file); |
e4200070 | 1024 | } |
f1c35659 | 1025 | bitmap_obstack_release (NULL); |
5514adf9 | 1026 | pointer_set_destroy (reachable_call_targets); |
ae01b312 | 1027 | ggc_collect (); |
aeeb194b | 1028 | } |
1029 | ||
3a849bc1 | 1030 | /* Translate the ugly representation of aliases as alias pairs into nice |
1031 | representation in callgraph. We don't handle all cases yet, | |
a3ddd82f | 1032 | unfortunately. */ |
3a849bc1 | 1033 | |
1034 | static void | |
1035 | handle_alias_pairs (void) | |
1036 | { | |
1037 | alias_pair *p; | |
1038 | unsigned i; | |
3a849bc1 | 1039 | |
f1f41a6c | 1040 | for (i = 0; alias_pairs && alias_pairs->iterate (i, &p);) |
3a849bc1 | 1041 | { |
48c84ee3 | 1042 | symtab_node target_node = symtab_node_for_asm (p->target); |
1043 | ||
a3ddd82f | 1044 | /* Weakrefs with target not defined in current unit are easy to handle: |
1045 | they behave just as external variables except we need to note the | |
1046 | alias flag to later output the weakref pseudo op into asm file. */ | |
1047 | if (!target_node | |
1048 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)) != NULL) | |
badeded8 | 1049 | { |
48669653 | 1050 | symtab_node node = symtab_get_node (p->decl); |
1051 | if (node) | |
fc8456b4 | 1052 | { |
48669653 | 1053 | node->symbol.alias_target = p->target; |
f2526cce | 1054 | node->symbol.weakref = true; |
48669653 | 1055 | node->symbol.alias = true; |
fc8456b4 | 1056 | } |
f1f41a6c | 1057 | alias_pairs->unordered_remove (i); |
48c84ee3 | 1058 | continue; |
badeded8 | 1059 | } |
48c84ee3 | 1060 | else if (!target_node) |
3a849bc1 | 1061 | { |
48c84ee3 | 1062 | error ("%q+D aliased to undefined symbol %qE", p->decl, p->target); |
a3ddd82f | 1063 | symtab_node node = symtab_get_node (p->decl); |
1064 | if (node) | |
1065 | node->symbol.alias = false; | |
f1f41a6c | 1066 | alias_pairs->unordered_remove (i); |
48c84ee3 | 1067 | continue; |
1068 | } | |
1069 | ||
afea39ad | 1070 | if (DECL_EXTERNAL (target_node->symbol.decl) |
1071 | /* We use local aliases for C++ thunks to force the tailcall | |
1072 | to bind locally. This is a hack - to keep it working do | |
1073 | the following (which is not strictly correct). */ | |
1074 | && (! TREE_CODE (target_node->symbol.decl) == FUNCTION_DECL | |
1075 | || ! DECL_VIRTUAL_P (target_node->symbol.decl)) | |
1076 | && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl))) | |
1077 | { | |
1078 | error ("%q+D aliased to external symbol %qE", | |
1079 | p->decl, p->target); | |
1080 | } | |
1081 | ||
48c84ee3 | 1082 | if (TREE_CODE (p->decl) == FUNCTION_DECL |
2dc9831f | 1083 | && target_node && is_a <cgraph_node> (target_node)) |
48c84ee3 | 1084 | { |
1085 | struct cgraph_node *src_node = cgraph_get_node (p->decl); | |
15ca8f90 | 1086 | if (src_node && src_node->symbol.definition) |
48c84ee3 | 1087 | cgraph_reset_node (src_node); |
1088 | cgraph_create_function_alias (p->decl, target_node->symbol.decl); | |
f1f41a6c | 1089 | alias_pairs->unordered_remove (i); |
48c84ee3 | 1090 | } |
1091 | else if (TREE_CODE (p->decl) == VAR_DECL | |
2dc9831f | 1092 | && target_node && is_a <varpool_node> (target_node)) |
48c84ee3 | 1093 | { |
1094 | varpool_create_variable_alias (p->decl, target_node->symbol.decl); | |
f1f41a6c | 1095 | alias_pairs->unordered_remove (i); |
48c84ee3 | 1096 | } |
1097 | else | |
1098 | { | |
1099 | error ("%q+D alias in between function and variable is not supported", | |
1100 | p->decl); | |
1101 | warning (0, "%q+D aliased declaration", | |
1102 | target_node->symbol.decl); | |
f1f41a6c | 1103 | alias_pairs->unordered_remove (i); |
3a849bc1 | 1104 | } |
1105 | } | |
f1f41a6c | 1106 | vec_free (alias_pairs); |
3a849bc1 | 1107 | } |
1108 | ||
8f69fd82 | 1109 | |
ae01b312 | 1110 | /* Figure out what functions we want to assemble. */ |
1111 | ||
1112 | static void | |
cf951b1a | 1113 | mark_functions_to_output (void) |
ae01b312 | 1114 | { |
1115 | struct cgraph_node *node; | |
61c2c7b1 | 1116 | #ifdef ENABLE_CHECKING |
1117 | bool check_same_comdat_groups = false; | |
1118 | ||
7c455d87 | 1119 | FOR_EACH_FUNCTION (node) |
61c2c7b1 | 1120 | gcc_assert (!node->process); |
1121 | #endif | |
ae01b312 | 1122 | |
7c455d87 | 1123 | FOR_EACH_FUNCTION (node) |
ae01b312 | 1124 | { |
7d0d0ce1 | 1125 | tree decl = node->symbol.decl; |
a0c938f0 | 1126 | |
7d0d0ce1 | 1127 | gcc_assert (!node->process || node->symbol.same_comdat_group); |
61c2c7b1 | 1128 | if (node->process) |
1129 | continue; | |
d7c6d889 | 1130 | |
e6d2b2d8 | 1131 | /* We need to output all local functions that are used and not |
1132 | always inlined, as well as those that are reachable from | |
1133 | outside the current compilation unit. */ | |
15ca8f90 | 1134 | if (node->symbol.analyzed |
91bf9d9a | 1135 | && !node->thunk.thunk_p |
15ca8f90 | 1136 | && !node->symbol.alias |
b0cdf642 | 1137 | && !node->global.inlined_to |
4ee9c684 | 1138 | && !TREE_ASM_WRITTEN (decl) |
ae01b312 | 1139 | && !DECL_EXTERNAL (decl)) |
61c2c7b1 | 1140 | { |
1141 | node->process = 1; | |
7d0d0ce1 | 1142 | if (node->symbol.same_comdat_group) |
61c2c7b1 | 1143 | { |
1144 | struct cgraph_node *next; | |
7d0d0ce1 | 1145 | for (next = cgraph (node->symbol.same_comdat_group); |
61c2c7b1 | 1146 | next != node; |
7d0d0ce1 | 1147 | next = cgraph (next->symbol.same_comdat_group)) |
15ca8f90 | 1148 | if (!next->thunk.thunk_p && !next->symbol.alias) |
91bf9d9a | 1149 | next->process = 1; |
61c2c7b1 | 1150 | } |
1151 | } | |
7d0d0ce1 | 1152 | else if (node->symbol.same_comdat_group) |
61c2c7b1 | 1153 | { |
1154 | #ifdef ENABLE_CHECKING | |
1155 | check_same_comdat_groups = true; | |
1156 | #endif | |
1157 | } | |
cc636d56 | 1158 | else |
9cee7c3f | 1159 | { |
1160 | /* We should've reclaimed all functions that are not needed. */ | |
1161 | #ifdef ENABLE_CHECKING | |
75a70cf9 | 1162 | if (!node->global.inlined_to |
1a1a827a | 1163 | && gimple_has_body_p (decl) |
08843223 | 1164 | /* FIXME: in ltrans unit when offline copy is outside partition but inline copies |
1165 | are inside partition, we can end up not removing the body since we no longer | |
1166 | have analyzed node pointing to it. */ | |
7d0d0ce1 | 1167 | && !node->symbol.in_other_partition |
15ca8f90 | 1168 | && !node->symbol.alias |
2d4bf241 | 1169 | && !node->clones |
9cee7c3f | 1170 | && !DECL_EXTERNAL (decl)) |
1171 | { | |
1172 | dump_cgraph_node (stderr, node); | |
1173 | internal_error ("failed to reclaim unneeded function"); | |
1174 | } | |
1175 | #endif | |
75a70cf9 | 1176 | gcc_assert (node->global.inlined_to |
1a1a827a | 1177 | || !gimple_has_body_p (decl) |
7d0d0ce1 | 1178 | || node->symbol.in_other_partition |
aa419a52 | 1179 | || node->clones |
1180 | || DECL_ARTIFICIAL (decl) | |
9cee7c3f | 1181 | || DECL_EXTERNAL (decl)); |
1182 | ||
1183 | } | |
a0c938f0 | 1184 | |
961e3b13 | 1185 | } |
61c2c7b1 | 1186 | #ifdef ENABLE_CHECKING |
1187 | if (check_same_comdat_groups) | |
7c455d87 | 1188 | FOR_EACH_FUNCTION (node) |
7d0d0ce1 | 1189 | if (node->symbol.same_comdat_group && !node->process) |
61c2c7b1 | 1190 | { |
7d0d0ce1 | 1191 | tree decl = node->symbol.decl; |
61c2c7b1 | 1192 | if (!node->global.inlined_to |
1193 | && gimple_has_body_p (decl) | |
6d36105a | 1194 | /* FIXME: in an ltrans unit when the offline copy is outside a |
1195 | partition but inline copies are inside a partition, we can | |
1196 | end up not removing the body since we no longer have an | |
1197 | analyzed node pointing to it. */ | |
7d0d0ce1 | 1198 | && !node->symbol.in_other_partition |
afea39ad | 1199 | && !node->clones |
61c2c7b1 | 1200 | && !DECL_EXTERNAL (decl)) |
1201 | { | |
1202 | dump_cgraph_node (stderr, node); | |
6d36105a | 1203 | internal_error ("failed to reclaim unneeded function in same " |
1204 | "comdat group"); | |
61c2c7b1 | 1205 | } |
1206 | } | |
1207 | #endif | |
961e3b13 | 1208 | } |
1209 | ||
28454517 | 1210 | /* DECL is FUNCTION_DECL. Initialize datastructures so DECL is a function |
cc8ef84f | 1211 | in lowered gimple form. IN_SSA is true if the gimple is in SSA. |
28454517 | 1212 | |
1213 | Set current_function_decl and cfun to newly constructed empty function body. | |
1214 | return basic block in the function body. */ | |
1215 | ||
cc8ef84f | 1216 | basic_block |
1217 | init_lowered_empty_function (tree decl, bool in_ssa) | |
28454517 | 1218 | { |
1219 | basic_block bb; | |
1220 | ||
1221 | current_function_decl = decl; | |
1222 | allocate_struct_function (decl, false); | |
1223 | gimple_register_cfg_hooks (); | |
1224 | init_empty_tree_cfg (); | |
cc8ef84f | 1225 | |
1226 | if (in_ssa) | |
1227 | { | |
1228 | init_tree_ssa (cfun); | |
1229 | init_ssa_operands (cfun); | |
1230 | cfun->gimple_df->in_ssa_p = true; | |
7eacb0dd | 1231 | cfun->curr_properties |= PROP_ssa; |
cc8ef84f | 1232 | } |
1233 | ||
28454517 | 1234 | DECL_INITIAL (decl) = make_node (BLOCK); |
1235 | ||
1236 | DECL_SAVED_TREE (decl) = error_mark_node; | |
7eacb0dd | 1237 | cfun->curr_properties |= (PROP_gimple_lcf | PROP_gimple_leh | PROP_gimple_any |
1238 | | PROP_cfg | PROP_loops); | |
1239 | ||
1240 | set_loops_for_fn (cfun, ggc_alloc_cleared_loops ()); | |
1241 | init_loops_structure (cfun, loops_for_fn (cfun), 1); | |
1242 | loops_for_fn (cfun)->state |= LOOPS_MAY_HAVE_MULTIPLE_LATCHES; | |
28454517 | 1243 | |
1244 | /* Create BB for body of the function and connect it properly. */ | |
1245 | bb = create_basic_block (NULL, (void *) 0, ENTRY_BLOCK_PTR); | |
7eacb0dd | 1246 | make_edge (ENTRY_BLOCK_PTR, bb, EDGE_FALLTHRU); |
167ef6d9 | 1247 | make_edge (bb, EXIT_BLOCK_PTR, 0); |
7eacb0dd | 1248 | add_bb_to_loop (bb, ENTRY_BLOCK_PTR->loop_father); |
28454517 | 1249 | |
1250 | return bb; | |
1251 | } | |
1252 | ||
1253 | /* Adjust PTR by the constant FIXED_OFFSET, and by the vtable | |
1254 | offset indicated by VIRTUAL_OFFSET, if that is | |
1255 | non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and | |
1256 | zero for a result adjusting thunk. */ | |
1257 | ||
1258 | static tree | |
1259 | thunk_adjust (gimple_stmt_iterator * bsi, | |
1260 | tree ptr, bool this_adjusting, | |
1261 | HOST_WIDE_INT fixed_offset, tree virtual_offset) | |
1262 | { | |
1263 | gimple stmt; | |
1264 | tree ret; | |
1265 | ||
55d6cb23 | 1266 | if (this_adjusting |
1267 | && fixed_offset != 0) | |
28454517 | 1268 | { |
2cc66f2a | 1269 | stmt = gimple_build_assign |
1270 | (ptr, fold_build_pointer_plus_hwi_loc (input_location, | |
1271 | ptr, | |
1272 | fixed_offset)); | |
28454517 | 1273 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1274 | } | |
1275 | ||
1276 | /* If there's a virtual offset, look up that value in the vtable and | |
1277 | adjust the pointer again. */ | |
1278 | if (virtual_offset) | |
1279 | { | |
1280 | tree vtabletmp; | |
1281 | tree vtabletmp2; | |
1282 | tree vtabletmp3; | |
28454517 | 1283 | |
1284 | if (!vtable_entry_type) | |
1285 | { | |
1286 | tree vfunc_type = make_node (FUNCTION_TYPE); | |
1287 | TREE_TYPE (vfunc_type) = integer_type_node; | |
1288 | TYPE_ARG_TYPES (vfunc_type) = NULL_TREE; | |
1289 | layout_type (vfunc_type); | |
1290 | ||
1291 | vtable_entry_type = build_pointer_type (vfunc_type); | |
1292 | } | |
1293 | ||
1294 | vtabletmp = | |
072f7ab1 | 1295 | create_tmp_reg (build_pointer_type |
37ffa8fe | 1296 | (build_pointer_type (vtable_entry_type)), "vptr"); |
28454517 | 1297 | |
1298 | /* The vptr is always at offset zero in the object. */ | |
1299 | stmt = gimple_build_assign (vtabletmp, | |
1300 | build1 (NOP_EXPR, TREE_TYPE (vtabletmp), | |
1301 | ptr)); | |
1302 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
28454517 | 1303 | |
1304 | /* Form the vtable address. */ | |
072f7ab1 | 1305 | vtabletmp2 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp)), |
37ffa8fe | 1306 | "vtableaddr"); |
28454517 | 1307 | stmt = gimple_build_assign (vtabletmp2, |
182cf5a9 | 1308 | build_simple_mem_ref (vtabletmp)); |
28454517 | 1309 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
28454517 | 1310 | |
1311 | /* Find the entry with the vcall offset. */ | |
1312 | stmt = gimple_build_assign (vtabletmp2, | |
2cc66f2a | 1313 | fold_build_pointer_plus_loc (input_location, |
1314 | vtabletmp2, | |
1315 | virtual_offset)); | |
28454517 | 1316 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1317 | ||
1318 | /* Get the offset itself. */ | |
072f7ab1 | 1319 | vtabletmp3 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp2)), |
37ffa8fe | 1320 | "vcalloffset"); |
28454517 | 1321 | stmt = gimple_build_assign (vtabletmp3, |
182cf5a9 | 1322 | build_simple_mem_ref (vtabletmp2)); |
28454517 | 1323 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
28454517 | 1324 | |
28454517 | 1325 | /* Adjust the `this' pointer. */ |
a0553bff | 1326 | ptr = fold_build_pointer_plus_loc (input_location, ptr, vtabletmp3); |
1327 | ptr = force_gimple_operand_gsi (bsi, ptr, true, NULL_TREE, false, | |
1328 | GSI_CONTINUE_LINKING); | |
28454517 | 1329 | } |
1330 | ||
55d6cb23 | 1331 | if (!this_adjusting |
1332 | && fixed_offset != 0) | |
28454517 | 1333 | /* Adjust the pointer by the constant. */ |
1334 | { | |
1335 | tree ptrtmp; | |
1336 | ||
1337 | if (TREE_CODE (ptr) == VAR_DECL) | |
1338 | ptrtmp = ptr; | |
1339 | else | |
1340 | { | |
072f7ab1 | 1341 | ptrtmp = create_tmp_reg (TREE_TYPE (ptr), "ptr"); |
28454517 | 1342 | stmt = gimple_build_assign (ptrtmp, ptr); |
1343 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
28454517 | 1344 | } |
2cc66f2a | 1345 | ptr = fold_build_pointer_plus_hwi_loc (input_location, |
1346 | ptrtmp, fixed_offset); | |
28454517 | 1347 | } |
1348 | ||
1349 | /* Emit the statement and gimplify the adjustment expression. */ | |
072f7ab1 | 1350 | ret = create_tmp_reg (TREE_TYPE (ptr), "adjusted_this"); |
28454517 | 1351 | stmt = gimple_build_assign (ret, ptr); |
28454517 | 1352 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1353 | ||
1354 | return ret; | |
1355 | } | |
1356 | ||
1357 | /* Produce assembler for thunk NODE. */ | |
1358 | ||
f2c6b33f | 1359 | void |
1360 | expand_thunk (struct cgraph_node *node) | |
28454517 | 1361 | { |
1362 | bool this_adjusting = node->thunk.this_adjusting; | |
1363 | HOST_WIDE_INT fixed_offset = node->thunk.fixed_offset; | |
1364 | HOST_WIDE_INT virtual_value = node->thunk.virtual_value; | |
1365 | tree virtual_offset = NULL; | |
48669653 | 1366 | tree alias = node->callees->callee->symbol.decl; |
7d0d0ce1 | 1367 | tree thunk_fndecl = node->symbol.decl; |
28454517 | 1368 | tree a = DECL_ARGUMENTS (thunk_fndecl); |
1369 | ||
1370 | current_function_decl = thunk_fndecl; | |
1371 | ||
aed6e608 | 1372 | /* Ensure thunks are emitted in their correct sections. */ |
1373 | resolve_unique_section (thunk_fndecl, 0, flag_function_sections); | |
1374 | ||
28454517 | 1375 | if (this_adjusting |
1376 | && targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset, | |
1377 | virtual_value, alias)) | |
1378 | { | |
1379 | const char *fnname; | |
1380 | tree fn_block; | |
28b2c6a7 | 1381 | tree restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); |
28454517 | 1382 | |
1383 | DECL_RESULT (thunk_fndecl) | |
1384 | = build_decl (DECL_SOURCE_LOCATION (thunk_fndecl), | |
28b2c6a7 | 1385 | RESULT_DECL, 0, restype); |
22ea3b47 | 1386 | fnname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk_fndecl)); |
28454517 | 1387 | |
1388 | /* The back end expects DECL_INITIAL to contain a BLOCK, so we | |
1389 | create one. */ | |
1390 | fn_block = make_node (BLOCK); | |
1391 | BLOCK_VARS (fn_block) = a; | |
1392 | DECL_INITIAL (thunk_fndecl) = fn_block; | |
1393 | init_function_start (thunk_fndecl); | |
1394 | cfun->is_thunk = 1; | |
32c7c682 | 1395 | insn_locations_init (); |
1396 | set_curr_insn_location (DECL_SOURCE_LOCATION (thunk_fndecl)); | |
1397 | prologue_location = curr_insn_location (); | |
28454517 | 1398 | assemble_start_function (thunk_fndecl, fnname); |
1399 | ||
1400 | targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl, | |
1401 | fixed_offset, virtual_value, alias); | |
1402 | ||
1403 | assemble_end_function (thunk_fndecl, fnname); | |
32c7c682 | 1404 | insn_locations_finalize (); |
28454517 | 1405 | init_insn_lengths (); |
1406 | free_after_compilation (cfun); | |
1407 | set_cfun (NULL); | |
1408 | TREE_ASM_WRITTEN (thunk_fndecl) = 1; | |
91bf9d9a | 1409 | node->thunk.thunk_p = false; |
15ca8f90 | 1410 | node->symbol.analyzed = false; |
28454517 | 1411 | } |
1412 | else | |
1413 | { | |
1414 | tree restype; | |
1415 | basic_block bb, then_bb, else_bb, return_bb; | |
1416 | gimple_stmt_iterator bsi; | |
1417 | int nargs = 0; | |
1418 | tree arg; | |
1419 | int i; | |
1420 | tree resdecl; | |
1421 | tree restmp = NULL; | |
f1f41a6c | 1422 | vec<tree> vargs; |
28454517 | 1423 | |
1424 | gimple call; | |
1425 | gimple ret; | |
1426 | ||
1427 | DECL_IGNORED_P (thunk_fndecl) = 1; | |
1428 | bitmap_obstack_initialize (NULL); | |
1429 | ||
1430 | if (node->thunk.virtual_offset_p) | |
1431 | virtual_offset = size_int (virtual_value); | |
1432 | ||
1433 | /* Build the return declaration for the function. */ | |
1434 | restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); | |
1435 | if (DECL_RESULT (thunk_fndecl) == NULL_TREE) | |
1436 | { | |
1437 | resdecl = build_decl (input_location, RESULT_DECL, 0, restype); | |
1438 | DECL_ARTIFICIAL (resdecl) = 1; | |
1439 | DECL_IGNORED_P (resdecl) = 1; | |
1440 | DECL_RESULT (thunk_fndecl) = resdecl; | |
1441 | } | |
1442 | else | |
1443 | resdecl = DECL_RESULT (thunk_fndecl); | |
1444 | ||
cc8ef84f | 1445 | bb = then_bb = else_bb = return_bb = init_lowered_empty_function (thunk_fndecl, true); |
28454517 | 1446 | |
1447 | bsi = gsi_start_bb (bb); | |
1448 | ||
1449 | /* Build call to the function being thunked. */ | |
1450 | if (!VOID_TYPE_P (restype)) | |
1451 | { | |
f2c6b33f | 1452 | if (DECL_BY_REFERENCE (resdecl)) |
1453 | restmp = gimple_fold_indirect_ref (resdecl); | |
1454 | else if (!is_gimple_reg_type (restype)) | |
28454517 | 1455 | { |
1456 | restmp = resdecl; | |
2ab2ce89 | 1457 | add_local_decl (cfun, restmp); |
28454517 | 1458 | BLOCK_VARS (DECL_INITIAL (current_function_decl)) = restmp; |
1459 | } | |
1460 | else | |
072f7ab1 | 1461 | restmp = create_tmp_reg (restype, "retval"); |
28454517 | 1462 | } |
1463 | ||
1767a056 | 1464 | for (arg = a; arg; arg = DECL_CHAIN (arg)) |
28454517 | 1465 | nargs++; |
f1f41a6c | 1466 | vargs.create (nargs); |
28454517 | 1467 | if (this_adjusting) |
f1f41a6c | 1468 | vargs.quick_push (thunk_adjust (&bsi, a, 1, fixed_offset, |
1469 | virtual_offset)); | |
f2c6b33f | 1470 | else if (nargs) |
f1f41a6c | 1471 | vargs.quick_push (a); |
f2c6b33f | 1472 | |
1473 | if (nargs) | |
1474 | for (i = 1, arg = DECL_CHAIN (a); i < nargs; i++, arg = DECL_CHAIN (arg)) | |
1475 | vargs.quick_push (arg); | |
28454517 | 1476 | call = gimple_build_call_vec (build_fold_addr_expr_loc (0, alias), vargs); |
f1f41a6c | 1477 | vargs.release (); |
28454517 | 1478 | gimple_call_set_from_thunk (call, true); |
1479 | if (restmp) | |
f2c6b33f | 1480 | { |
1481 | gimple_call_set_lhs (call, restmp); | |
1482 | gcc_assert (useless_type_conversion_p (TREE_TYPE (restmp), | |
1483 | TREE_TYPE (TREE_TYPE (alias)))); | |
1484 | } | |
28454517 | 1485 | gsi_insert_after (&bsi, call, GSI_NEW_STMT); |
f2c6b33f | 1486 | if (!(gimple_call_flags (call) & ECF_NORETURN)) |
1487 | { | |
1488 | if (restmp && !this_adjusting | |
1489 | && (fixed_offset || virtual_offset)) | |
1490 | { | |
1491 | tree true_label = NULL_TREE; | |
28454517 | 1492 | |
f2c6b33f | 1493 | if (TREE_CODE (TREE_TYPE (restmp)) == POINTER_TYPE) |
1494 | { | |
1495 | gimple stmt; | |
1496 | /* If the return type is a pointer, we need to | |
1497 | protect against NULL. We know there will be an | |
1498 | adjustment, because that's why we're emitting a | |
1499 | thunk. */ | |
1500 | then_bb = create_basic_block (NULL, (void *) 0, bb); | |
1501 | return_bb = create_basic_block (NULL, (void *) 0, then_bb); | |
1502 | else_bb = create_basic_block (NULL, (void *) 0, else_bb); | |
1503 | add_bb_to_loop (then_bb, bb->loop_father); | |
1504 | add_bb_to_loop (return_bb, bb->loop_father); | |
1505 | add_bb_to_loop (else_bb, bb->loop_father); | |
1506 | remove_edge (single_succ_edge (bb)); | |
1507 | true_label = gimple_block_label (then_bb); | |
1508 | stmt = gimple_build_cond (NE_EXPR, restmp, | |
1509 | build_zero_cst (TREE_TYPE (restmp)), | |
1510 | NULL_TREE, NULL_TREE); | |
1511 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
1512 | make_edge (bb, then_bb, EDGE_TRUE_VALUE); | |
1513 | make_edge (bb, else_bb, EDGE_FALSE_VALUE); | |
1514 | make_edge (return_bb, EXIT_BLOCK_PTR, 0); | |
1515 | make_edge (then_bb, return_bb, EDGE_FALLTHRU); | |
1516 | make_edge (else_bb, return_bb, EDGE_FALLTHRU); | |
1517 | bsi = gsi_last_bb (then_bb); | |
1518 | } | |
28454517 | 1519 | |
f2c6b33f | 1520 | restmp = thunk_adjust (&bsi, restmp, /*this_adjusting=*/0, |
1521 | fixed_offset, virtual_offset); | |
1522 | if (true_label) | |
1523 | { | |
1524 | gimple stmt; | |
1525 | bsi = gsi_last_bb (else_bb); | |
1526 | stmt = gimple_build_assign (restmp, | |
1527 | build_zero_cst (TREE_TYPE (restmp))); | |
1528 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
1529 | bsi = gsi_last_bb (return_bb); | |
1530 | } | |
28454517 | 1531 | } |
f2c6b33f | 1532 | else |
1533 | gimple_call_set_tail (call, true); | |
28454517 | 1534 | |
f2c6b33f | 1535 | /* Build return value. */ |
1536 | ret = gimple_build_return (restmp); | |
1537 | gsi_insert_after (&bsi, ret, GSI_NEW_STMT); | |
28454517 | 1538 | } |
1539 | else | |
f2c6b33f | 1540 | { |
1541 | gimple_call_set_tail (call, true); | |
1542 | remove_edge (single_succ_edge (bb)); | |
1543 | } | |
28454517 | 1544 | |
1545 | delete_unreachable_blocks (); | |
1546 | update_ssa (TODO_update_ssa); | |
f2c6b33f | 1547 | #ifdef ENABLE_CHECKING |
1548 | verify_flow_info (); | |
1549 | #endif | |
28454517 | 1550 | |
28454517 | 1551 | /* Since we want to emit the thunk, we explicitly mark its name as |
1552 | referenced. */ | |
91bf9d9a | 1553 | node->thunk.thunk_p = false; |
f2c6b33f | 1554 | rebuild_cgraph_edges (); |
28454517 | 1555 | cgraph_add_new_function (thunk_fndecl, true); |
1556 | bitmap_obstack_release (NULL); | |
1557 | } | |
1558 | current_function_decl = NULL; | |
9078126c | 1559 | set_cfun (NULL); |
28454517 | 1560 | } |
1561 | ||
9d75589a | 1562 | /* Assemble thunks and aliases associated to NODE. */ |
91bf9d9a | 1563 | |
1564 | static void | |
c70f46b0 | 1565 | assemble_thunks_and_aliases (struct cgraph_node *node) |
91bf9d9a | 1566 | { |
1567 | struct cgraph_edge *e; | |
c70f46b0 | 1568 | int i; |
1569 | struct ipa_ref *ref; | |
1570 | ||
91bf9d9a | 1571 | for (e = node->callers; e;) |
1572 | if (e->caller->thunk.thunk_p) | |
1573 | { | |
1574 | struct cgraph_node *thunk = e->caller; | |
1575 | ||
1576 | e = e->next_caller; | |
c70f46b0 | 1577 | assemble_thunks_and_aliases (thunk); |
f2c6b33f | 1578 | expand_thunk (thunk); |
91bf9d9a | 1579 | } |
1580 | else | |
1581 | e = e->next_caller; | |
04ec15fa | 1582 | for (i = 0; ipa_ref_list_referring_iterate (&node->symbol.ref_list, |
7d0d0ce1 | 1583 | i, ref); i++) |
c70f46b0 | 1584 | if (ref->use == IPA_REF_ALIAS) |
1585 | { | |
04ec15fa | 1586 | struct cgraph_node *alias = ipa_ref_referring_node (ref); |
48669653 | 1587 | bool saved_written = TREE_ASM_WRITTEN (node->symbol.decl); |
968b8c52 | 1588 | |
1589 | /* Force assemble_alias to really output the alias this time instead | |
1590 | of buffering it in same alias pairs. */ | |
48669653 | 1591 | TREE_ASM_WRITTEN (node->symbol.decl) = 1; |
afea39ad | 1592 | do_assemble_alias (alias->symbol.decl, |
48669653 | 1593 | DECL_ASSEMBLER_NAME (node->symbol.decl)); |
c70f46b0 | 1594 | assemble_thunks_and_aliases (alias); |
48669653 | 1595 | TREE_ASM_WRITTEN (node->symbol.decl) = saved_written; |
c70f46b0 | 1596 | } |
91bf9d9a | 1597 | } |
1598 | ||
da5e1e7c | 1599 | /* Expand function specified by NODE. */ |
941366fd | 1600 | |
3db65b62 | 1601 | static void |
cf951b1a | 1602 | expand_function (struct cgraph_node *node) |
941366fd | 1603 | { |
da5e1e7c | 1604 | tree decl = node->symbol.decl; |
941366fd | 1605 | location_t saved_loc; |
1606 | ||
da5e1e7c | 1607 | /* We ought to not compile any inline clones. */ |
1608 | gcc_assert (!node->global.inlined_to); | |
1609 | ||
1610 | announce_function (decl); | |
1611 | node->process = 0; | |
1612 | gcc_assert (node->lowered); | |
eaad46f2 | 1613 | cgraph_get_body (node); |
da5e1e7c | 1614 | |
1615 | /* Generate RTL for the body of DECL. */ | |
1616 | ||
941366fd | 1617 | timevar_push (TV_REST_OF_COMPILATION); |
1618 | ||
1619 | gcc_assert (cgraph_global_info_ready); | |
1620 | ||
1621 | /* Initialize the default bitmap obstack. */ | |
1622 | bitmap_obstack_initialize (NULL); | |
1623 | ||
1624 | /* Initialize the RTL code for the function. */ | |
da5e1e7c | 1625 | current_function_decl = decl; |
941366fd | 1626 | saved_loc = input_location; |
da5e1e7c | 1627 | input_location = DECL_SOURCE_LOCATION (decl); |
1628 | init_function_start (decl); | |
941366fd | 1629 | |
1630 | gimple_register_cfg_hooks (); | |
1631 | ||
1632 | bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL generation*/ | |
1633 | ||
1634 | execute_all_ipa_transforms (); | |
1635 | ||
1636 | /* Perform all tree transforms and optimizations. */ | |
1637 | ||
1638 | /* Signal the start of passes. */ | |
1639 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_START, NULL); | |
1640 | ||
3ea50c01 | 1641 | execute_pass_list (g->get_passes ()->all_passes); |
941366fd | 1642 | |
1643 | /* Signal the end of passes. */ | |
1644 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_END, NULL); | |
1645 | ||
1646 | bitmap_obstack_release (®_obstack); | |
1647 | ||
1648 | /* Release the default bitmap obstack. */ | |
1649 | bitmap_obstack_release (NULL); | |
1650 | ||
941366fd | 1651 | /* If requested, warn about function definitions where the function will |
1652 | return a value (usually of some struct or union type) which itself will | |
1653 | take up a lot of stack space. */ | |
da5e1e7c | 1654 | if (warn_larger_than && !DECL_EXTERNAL (decl) && TREE_TYPE (decl)) |
941366fd | 1655 | { |
da5e1e7c | 1656 | tree ret_type = TREE_TYPE (TREE_TYPE (decl)); |
941366fd | 1657 | |
1658 | if (ret_type && TYPE_SIZE_UNIT (ret_type) | |
1659 | && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST | |
1660 | && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type), | |
1661 | larger_than_size)) | |
1662 | { | |
1663 | unsigned int size_as_int | |
1664 | = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type)); | |
1665 | ||
1666 | if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0) | |
1667 | warning (OPT_Wlarger_than_, "size of return value of %q+D is %u bytes", | |
da5e1e7c | 1668 | decl, size_as_int); |
941366fd | 1669 | else |
1670 | warning (OPT_Wlarger_than_, "size of return value of %q+D is larger than %wd bytes", | |
da5e1e7c | 1671 | decl, larger_than_size); |
941366fd | 1672 | } |
1673 | } | |
1674 | ||
da5e1e7c | 1675 | gimple_set_body (decl, NULL); |
1676 | if (DECL_STRUCT_FUNCTION (decl) == 0 | |
1677 | && !cgraph_get_node (decl)->origin) | |
941366fd | 1678 | { |
1679 | /* Stop pointing to the local nodes about to be freed. | |
1680 | But DECL_INITIAL must remain nonzero so we know this | |
1681 | was an actual function definition. | |
1682 | For a nested function, this is done in c_pop_function_context. | |
1683 | If rest_of_compilation set this to 0, leave it 0. */ | |
da5e1e7c | 1684 | if (DECL_INITIAL (decl) != 0) |
1685 | DECL_INITIAL (decl) = error_mark_node; | |
941366fd | 1686 | } |
1687 | ||
1688 | input_location = saved_loc; | |
1689 | ||
1690 | ggc_collect (); | |
1691 | timevar_pop (TV_REST_OF_COMPILATION); | |
f7777314 | 1692 | |
1693 | /* Make sure that BE didn't give up on compiling. */ | |
1694 | gcc_assert (TREE_ASM_WRITTEN (decl)); | |
9078126c | 1695 | set_cfun (NULL); |
f7777314 | 1696 | current_function_decl = NULL; |
f76f7453 | 1697 | |
1698 | /* It would make a lot more sense to output thunks before function body to get more | |
cf951b1a | 1699 | forward and lest backwarding jumps. This however would need solving problem |
f76f7453 | 1700 | with comdats. See PR48668. Also aliases must come after function itself to |
cf951b1a | 1701 | make one pass assemblers, like one on AIX, happy. See PR 50689. |
f76f7453 | 1702 | FIXME: Perhaps thunks should be move before function IFF they are not in comdat |
1703 | groups. */ | |
1704 | assemble_thunks_and_aliases (node); | |
1a1a827a | 1705 | cgraph_release_function_body (node); |
1706 | /* Eliminate all call edges. This is important so the GIMPLE_CALL no longer | |
1707 | points to the dead function body. */ | |
1708 | cgraph_node_remove_callees (node); | |
9df17e79 | 1709 | ipa_remove_all_references (&node->symbol.ref_list); |
ae01b312 | 1710 | } |
1711 | ||
acc70efa | 1712 | |
d9d9733a | 1713 | /* Expand all functions that must be output. |
1714 | ||
d7c6d889 | 1715 | Attempt to topologically sort the nodes so function is output when |
1716 | all called functions are already assembled to allow data to be | |
91c82c20 | 1717 | propagated across the callgraph. Use a stack to get smaller distance |
3927afe0 | 1718 | between a function and its callees (later we may choose to use a more |
d7c6d889 | 1719 | sophisticated algorithm for function reordering; we will likely want |
1720 | to use subsections to make the output functions appear in top-down | |
1721 | order). */ | |
1722 | ||
1723 | static void | |
cf951b1a | 1724 | expand_all_functions (void) |
d7c6d889 | 1725 | { |
1726 | struct cgraph_node *node; | |
4c36ffe6 | 1727 | struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); |
c04e3894 | 1728 | int order_pos, new_order_pos = 0; |
d7c6d889 | 1729 | int i; |
1730 | ||
7771d558 | 1731 | order_pos = ipa_reverse_postorder (order); |
cc636d56 | 1732 | gcc_assert (order_pos == cgraph_n_nodes); |
d7c6d889 | 1733 | |
7bd28bba | 1734 | /* Garbage collector may remove inline clones we eliminate during |
b0cdf642 | 1735 | optimization. So we must be sure to not reference them. */ |
1736 | for (i = 0; i < order_pos; i++) | |
09fc9532 | 1737 | if (order[i]->process) |
b0cdf642 | 1738 | order[new_order_pos++] = order[i]; |
1739 | ||
1740 | for (i = new_order_pos - 1; i >= 0; i--) | |
d7c6d889 | 1741 | { |
1742 | node = order[i]; | |
09fc9532 | 1743 | if (node->process) |
d7c6d889 | 1744 | { |
09fc9532 | 1745 | node->process = 0; |
cf951b1a | 1746 | expand_function (node); |
d7c6d889 | 1747 | } |
1748 | } | |
523c1122 | 1749 | cgraph_process_new_functions (); |
773c5ba7 | 1750 | |
d7c6d889 | 1751 | free (order); |
773c5ba7 | 1752 | |
d7c6d889 | 1753 | } |
1754 | ||
56af936e | 1755 | /* This is used to sort the node types by the cgraph order number. */ |
1756 | ||
0b09525f | 1757 | enum cgraph_order_sort_kind |
1758 | { | |
1759 | ORDER_UNDEFINED = 0, | |
1760 | ORDER_FUNCTION, | |
1761 | ORDER_VAR, | |
1762 | ORDER_ASM | |
1763 | }; | |
1764 | ||
56af936e | 1765 | struct cgraph_order_sort |
1766 | { | |
0b09525f | 1767 | enum cgraph_order_sort_kind kind; |
56af936e | 1768 | union |
1769 | { | |
1770 | struct cgraph_node *f; | |
1d416bd7 | 1771 | struct varpool_node *v; |
cf951b1a | 1772 | struct asm_node *a; |
56af936e | 1773 | } u; |
1774 | }; | |
1775 | ||
1776 | /* Output all functions, variables, and asm statements in the order | |
1777 | according to their order fields, which is the order in which they | |
1778 | appeared in the file. This implements -fno-toplevel-reorder. In | |
1779 | this mode we may output functions and variables which don't really | |
1780 | need to be output. */ | |
1781 | ||
1782 | static void | |
cf951b1a | 1783 | output_in_order (void) |
56af936e | 1784 | { |
1785 | int max; | |
56af936e | 1786 | struct cgraph_order_sort *nodes; |
1787 | int i; | |
1788 | struct cgraph_node *pf; | |
1d416bd7 | 1789 | struct varpool_node *pv; |
cf951b1a | 1790 | struct asm_node *pa; |
56af936e | 1791 | |
0704fb2e | 1792 | max = symtab_order; |
3e1cde87 | 1793 | nodes = XCNEWVEC (struct cgraph_order_sort, max); |
56af936e | 1794 | |
7c455d87 | 1795 | FOR_EACH_DEFINED_FUNCTION (pf) |
56af936e | 1796 | { |
15ca8f90 | 1797 | if (pf->process && !pf->thunk.thunk_p && !pf->symbol.alias) |
56af936e | 1798 | { |
7d0d0ce1 | 1799 | i = pf->symbol.order; |
56af936e | 1800 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); |
1801 | nodes[i].kind = ORDER_FUNCTION; | |
1802 | nodes[i].u.f = pf; | |
1803 | } | |
1804 | } | |
1805 | ||
7c455d87 | 1806 | FOR_EACH_DEFINED_VARIABLE (pv) |
aa419a52 | 1807 | if (!DECL_EXTERNAL (pv->symbol.decl)) |
1808 | { | |
1809 | i = pv->symbol.order; | |
1810 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1811 | nodes[i].kind = ORDER_VAR; | |
1812 | nodes[i].u.v = pv; | |
1813 | } | |
56af936e | 1814 | |
cf951b1a | 1815 | for (pa = asm_nodes; pa; pa = pa->next) |
56af936e | 1816 | { |
1817 | i = pa->order; | |
1818 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1819 | nodes[i].kind = ORDER_ASM; | |
1820 | nodes[i].u.a = pa; | |
1821 | } | |
56af936e | 1822 | |
304e5318 | 1823 | /* In toplevel reorder mode we output all statics; mark them as needed. */ |
304e5318 | 1824 | |
91da0f1c | 1825 | for (i = 0; i < max; ++i) |
1826 | if (nodes[i].kind == ORDER_VAR) | |
1827 | varpool_finalize_named_section_flags (nodes[i].u.v); | |
1828 | ||
56af936e | 1829 | for (i = 0; i < max; ++i) |
1830 | { | |
1831 | switch (nodes[i].kind) | |
1832 | { | |
1833 | case ORDER_FUNCTION: | |
09fc9532 | 1834 | nodes[i].u.f->process = 0; |
cf951b1a | 1835 | expand_function (nodes[i].u.f); |
56af936e | 1836 | break; |
1837 | ||
1838 | case ORDER_VAR: | |
1d416bd7 | 1839 | varpool_assemble_decl (nodes[i].u.v); |
56af936e | 1840 | break; |
1841 | ||
1842 | case ORDER_ASM: | |
1843 | assemble_asm (nodes[i].u.a->asm_str); | |
1844 | break; | |
1845 | ||
1846 | case ORDER_UNDEFINED: | |
1847 | break; | |
1848 | ||
1849 | default: | |
1850 | gcc_unreachable (); | |
1851 | } | |
1852 | } | |
4b4ea2db | 1853 | |
cf951b1a | 1854 | asm_nodes = NULL; |
3e1cde87 | 1855 | free (nodes); |
56af936e | 1856 | } |
1857 | ||
77fce4cd | 1858 | static void |
1859 | ipa_passes (void) | |
1860 | { | |
3ea50c01 | 1861 | gcc::pass_manager *passes = g->get_passes (); |
1862 | ||
87d4aa85 | 1863 | set_cfun (NULL); |
4b14adf9 | 1864 | current_function_decl = NULL; |
75a70cf9 | 1865 | gimple_register_cfg_hooks (); |
77fce4cd | 1866 | bitmap_obstack_initialize (NULL); |
59dd4830 | 1867 | |
c9036234 | 1868 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_START, NULL); |
1869 | ||
59dd4830 | 1870 | if (!in_lto_p) |
7b2e8956 | 1871 | { |
3ea50c01 | 1872 | execute_ipa_pass_list (passes->all_small_ipa_passes); |
7b2e8956 | 1873 | if (seen_error ()) |
1874 | return; | |
1875 | } | |
9ed5b1f5 | 1876 | |
941125aa | 1877 | /* We never run removal of unreachable nodes after early passes. This is |
1878 | because TODO is run before the subpasses. It is important to remove | |
1879 | the unreachable functions to save works at IPA level and to get LTO | |
1880 | symbol tables right. */ | |
91f0ab48 | 1881 | symtab_remove_unreachable_nodes (true, cgraph_dump_file); |
941125aa | 1882 | |
7bfefa9d | 1883 | /* If pass_all_early_optimizations was not scheduled, the state of |
1884 | the cgraph will not be properly updated. Update it now. */ | |
1885 | if (cgraph_state < CGRAPH_STATE_IPA_SSA) | |
1886 | cgraph_state = CGRAPH_STATE_IPA_SSA; | |
9ed5b1f5 | 1887 | |
7bfefa9d | 1888 | if (!in_lto_p) |
1889 | { | |
1890 | /* Generate coverage variables and constructors. */ | |
1891 | coverage_finish (); | |
1892 | ||
1893 | /* Process new functions added. */ | |
1894 | set_cfun (NULL); | |
1895 | current_function_decl = NULL; | |
1896 | cgraph_process_new_functions (); | |
7bfefa9d | 1897 | |
c9036234 | 1898 | execute_ipa_summary_passes |
3ea50c01 | 1899 | ((struct ipa_opt_pass_d *) passes->all_regular_ipa_passes); |
8867b500 | 1900 | } |
23433d72 | 1901 | |
1902 | /* Some targets need to handle LTO assembler output specially. */ | |
1903 | if (flag_generate_lto) | |
1904 | targetm.asm_out.lto_start (); | |
1905 | ||
3ea50c01 | 1906 | execute_ipa_summary_passes ((struct ipa_opt_pass_d *) |
1907 | passes->all_lto_gen_passes); | |
7bfefa9d | 1908 | |
1909 | if (!in_lto_p) | |
1910 | ipa_write_summaries (); | |
1911 | ||
23433d72 | 1912 | if (flag_generate_lto) |
1913 | targetm.asm_out.lto_end (); | |
1914 | ||
b33542ab | 1915 | if (!flag_ltrans && (in_lto_p || !flag_lto || flag_fat_lto_objects)) |
3ea50c01 | 1916 | execute_ipa_pass_list (passes->all_regular_ipa_passes); |
c9036234 | 1917 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_END, NULL); |
9ed5b1f5 | 1918 | |
77fce4cd | 1919 | bitmap_obstack_release (NULL); |
1920 | } | |
1921 | ||
badeded8 | 1922 | |
1923 | /* Return string alias is alias of. */ | |
1924 | ||
1925 | static tree | |
1926 | get_alias_symbol (tree decl) | |
1927 | { | |
1928 | tree alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); | |
1929 | return get_identifier (TREE_STRING_POINTER | |
1930 | (TREE_VALUE (TREE_VALUE (alias)))); | |
1931 | } | |
1932 | ||
1933 | ||
5e712541 | 1934 | /* Weakrefs may be associated to external decls and thus not output |
9d75589a | 1935 | at expansion time. Emit all necessary aliases. */ |
5e712541 | 1936 | |
5139ff04 | 1937 | static void |
5e712541 | 1938 | output_weakrefs (void) |
1939 | { | |
48669653 | 1940 | symtab_node node; |
1941 | FOR_EACH_SYMBOL (node) | |
f2526cce | 1942 | if (node->symbol.alias |
7d0d0ce1 | 1943 | && !TREE_ASM_WRITTEN (node->symbol.decl) |
f2526cce | 1944 | && node->symbol.weakref) |
48669653 | 1945 | { |
1946 | tree target; | |
1947 | ||
1948 | /* Weakrefs are special by not requiring target definition in current | |
1949 | compilation unit. It is thus bit hard to work out what we want to | |
1950 | alias. | |
1951 | When alias target is defined, we need to fetch it from symtab reference, | |
1952 | otherwise it is pointed to by alias_target. */ | |
1953 | if (node->symbol.alias_target) | |
1954 | target = (DECL_P (node->symbol.alias_target) | |
1955 | ? DECL_ASSEMBLER_NAME (node->symbol.alias_target) | |
1956 | : node->symbol.alias_target); | |
1957 | else if (node->symbol.analyzed) | |
1958 | target = DECL_ASSEMBLER_NAME (symtab_alias_target (node)->symbol.decl); | |
1959 | else | |
1960 | { | |
1961 | gcc_unreachable (); | |
1962 | target = get_alias_symbol (node->symbol.decl); | |
1963 | } | |
1964 | do_assemble_alias (node->symbol.decl, target); | |
1965 | } | |
5e712541 | 1966 | } |
1967 | ||
da5e1e7c | 1968 | /* Initialize callgraph dump file. */ |
34e5cced | 1969 | |
121f3051 | 1970 | void |
1971 | init_cgraph (void) | |
1972 | { | |
01ec0a6c | 1973 | if (!cgraph_dump_file) |
1974 | cgraph_dump_file = dump_begin (TDI_cgraph, NULL); | |
121f3051 | 1975 | } |
b5d36404 | 1976 | |
d2bb3f9d | 1977 | |
1978 | /* Perform simple optimizations based on callgraph. */ | |
1979 | ||
1980 | void | |
cf951b1a | 1981 | compile (void) |
d2bb3f9d | 1982 | { |
1983 | if (seen_error ()) | |
1984 | return; | |
1985 | ||
1986 | #ifdef ENABLE_CHECKING | |
3e7775f6 | 1987 | verify_symtab (); |
d2bb3f9d | 1988 | #endif |
1989 | ||
d2bb3f9d | 1990 | timevar_push (TV_CGRAPHOPT); |
1991 | if (pre_ipa_mem_report) | |
1992 | { | |
1993 | fprintf (stderr, "Memory consumption before IPA\n"); | |
1994 | dump_memory_report (false); | |
1995 | } | |
1996 | if (!quiet_flag) | |
1997 | fprintf (stderr, "Performing interprocedural optimizations\n"); | |
1998 | cgraph_state = CGRAPH_STATE_IPA; | |
1999 | ||
cf951b1a | 2000 | /* If LTO is enabled, initialize the streamer hooks needed by GIMPLE. */ |
2001 | if (flag_lto) | |
2002 | lto_streamer_hooks_init (); | |
2003 | ||
d2bb3f9d | 2004 | /* Don't run the IPA passes if there was any error or sorry messages. */ |
2005 | if (!seen_error ()) | |
2006 | ipa_passes (); | |
2007 | ||
2008 | /* Do nothing else if any IPA pass found errors or if we are just streaming LTO. */ | |
2009 | if (seen_error () | |
2010 | || (!in_lto_p && flag_lto && !flag_fat_lto_objects)) | |
2011 | { | |
2012 | timevar_pop (TV_CGRAPHOPT); | |
2013 | return; | |
2014 | } | |
2015 | ||
2016 | /* This pass remove bodies of extern inline functions we never inlined. | |
2017 | Do this later so other IPA passes see what is really going on. */ | |
91f0ab48 | 2018 | symtab_remove_unreachable_nodes (false, dump_file); |
d2bb3f9d | 2019 | cgraph_global_info_ready = true; |
2020 | if (cgraph_dump_file) | |
2021 | { | |
2022 | fprintf (cgraph_dump_file, "Optimized "); | |
18841b0c | 2023 | dump_symtab (cgraph_dump_file); |
d2bb3f9d | 2024 | } |
2025 | if (post_ipa_mem_report) | |
2026 | { | |
2027 | fprintf (stderr, "Memory consumption after IPA\n"); | |
2028 | dump_memory_report (false); | |
2029 | } | |
2030 | timevar_pop (TV_CGRAPHOPT); | |
2031 | ||
2032 | /* Output everything. */ | |
2033 | (*debug_hooks->assembly_start) (); | |
2034 | if (!quiet_flag) | |
2035 | fprintf (stderr, "Assembling functions:\n"); | |
2036 | #ifdef ENABLE_CHECKING | |
3e7775f6 | 2037 | verify_symtab (); |
d2bb3f9d | 2038 | #endif |
2039 | ||
2040 | cgraph_materialize_all_clones (); | |
2041 | bitmap_obstack_initialize (NULL); | |
3ea50c01 | 2042 | execute_ipa_pass_list (g->get_passes ()->all_late_ipa_passes); |
91f0ab48 | 2043 | symtab_remove_unreachable_nodes (true, dump_file); |
d2bb3f9d | 2044 | #ifdef ENABLE_CHECKING |
3e7775f6 | 2045 | verify_symtab (); |
d2bb3f9d | 2046 | #endif |
2047 | bitmap_obstack_release (NULL); | |
cf951b1a | 2048 | mark_functions_to_output (); |
d2bb3f9d | 2049 | |
4cd8ae4b | 2050 | /* When weakref support is missing, we autmatically translate all |
2051 | references to NODE to references to its ultimate alias target. | |
2052 | The renaming mechanizm uses flag IDENTIFIER_TRANSPARENT_ALIAS and | |
2053 | TREE_CHAIN. | |
2054 | ||
2055 | Set up this mapping before we output any assembler but once we are sure | |
2056 | that all symbol renaming is done. | |
2057 | ||
2058 | FIXME: All this uglyness can go away if we just do renaming at gimple | |
2059 | level by physically rewritting the IL. At the moment we can only redirect | |
2060 | calls, so we need infrastructure for renaming references as well. */ | |
2061 | #ifndef ASM_OUTPUT_WEAKREF | |
2062 | symtab_node node; | |
2063 | ||
2064 | FOR_EACH_SYMBOL (node) | |
2065 | if (node->symbol.alias | |
2066 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (node->symbol.decl))) | |
2067 | { | |
2068 | IDENTIFIER_TRANSPARENT_ALIAS | |
2069 | (DECL_ASSEMBLER_NAME (node->symbol.decl)) = 1; | |
2070 | TREE_CHAIN (DECL_ASSEMBLER_NAME (node->symbol.decl)) | |
2071 | = (node->symbol.alias_target ? node->symbol.alias_target | |
2072 | : DECL_ASSEMBLER_NAME (symtab_alias_target (node)->symbol.decl)); | |
2073 | } | |
2074 | #endif | |
2075 | ||
d2bb3f9d | 2076 | cgraph_state = CGRAPH_STATE_EXPANSION; |
2077 | if (!flag_toplevel_reorder) | |
cf951b1a | 2078 | output_in_order (); |
d2bb3f9d | 2079 | else |
2080 | { | |
cf951b1a | 2081 | output_asm_statements (); |
d2bb3f9d | 2082 | |
cf951b1a | 2083 | expand_all_functions (); |
2084 | varpool_output_variables (); | |
d2bb3f9d | 2085 | } |
2086 | ||
2087 | cgraph_process_new_functions (); | |
2088 | cgraph_state = CGRAPH_STATE_FINISHED; | |
afea39ad | 2089 | output_weakrefs (); |
d2bb3f9d | 2090 | |
2091 | if (cgraph_dump_file) | |
2092 | { | |
2093 | fprintf (cgraph_dump_file, "\nFinal "); | |
18841b0c | 2094 | dump_symtab (cgraph_dump_file); |
d2bb3f9d | 2095 | } |
2096 | #ifdef ENABLE_CHECKING | |
3e7775f6 | 2097 | verify_symtab (); |
d2bb3f9d | 2098 | /* Double check that all inline clones are gone and that all |
2099 | function bodies have been released from memory. */ | |
2100 | if (!seen_error ()) | |
2101 | { | |
2102 | struct cgraph_node *node; | |
2103 | bool error_found = false; | |
2104 | ||
7c455d87 | 2105 | FOR_EACH_DEFINED_FUNCTION (node) |
2106 | if (node->global.inlined_to | |
2107 | || gimple_has_body_p (node->symbol.decl)) | |
d2bb3f9d | 2108 | { |
2109 | error_found = true; | |
2110 | dump_cgraph_node (stderr, node); | |
2111 | } | |
2112 | if (error_found) | |
2113 | internal_error ("nodes with unreleased memory found"); | |
2114 | } | |
2115 | #endif | |
2116 | } | |
2117 | ||
2118 | ||
2119 | /* Analyze the whole compilation unit once it is parsed completely. */ | |
2120 | ||
2121 | void | |
cf951b1a | 2122 | finalize_compilation_unit (void) |
d2bb3f9d | 2123 | { |
2124 | timevar_push (TV_CGRAPH); | |
2125 | ||
d2bb3f9d | 2126 | /* If we're here there's no current function anymore. Some frontends |
2127 | are lazy in clearing these. */ | |
2128 | current_function_decl = NULL; | |
2129 | set_cfun (NULL); | |
2130 | ||
2131 | /* Do not skip analyzing the functions if there were errors, we | |
2132 | miss diagnostics for following functions otherwise. */ | |
2133 | ||
2134 | /* Emit size functions we didn't inline. */ | |
2135 | finalize_size_functions (); | |
2136 | ||
2137 | /* Mark alias targets necessary and emit diagnostics. */ | |
d2bb3f9d | 2138 | handle_alias_pairs (); |
2139 | ||
2140 | if (!quiet_flag) | |
2141 | { | |
2142 | fprintf (stderr, "\nAnalyzing compilation unit\n"); | |
2143 | fflush (stderr); | |
2144 | } | |
2145 | ||
2146 | if (flag_dump_passes) | |
2147 | dump_passes (); | |
2148 | ||
2149 | /* Gimplify and lower all functions, compute reachability and | |
2150 | remove unreachable nodes. */ | |
15ca8f90 | 2151 | analyze_functions (); |
d2bb3f9d | 2152 | |
2153 | /* Mark alias targets necessary and emit diagnostics. */ | |
d2bb3f9d | 2154 | handle_alias_pairs (); |
2155 | ||
2156 | /* Gimplify and lower thunks. */ | |
15ca8f90 | 2157 | analyze_functions (); |
d2bb3f9d | 2158 | |
2159 | /* Finally drive the pass manager. */ | |
cf951b1a | 2160 | compile (); |
d2bb3f9d | 2161 | |
2162 | timevar_pop (TV_CGRAPH); | |
2163 | } | |
2164 | ||
2165 | ||
a861fe52 | 2166 | #include "gt-cgraphunit.h" |