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9c8305f8 | 1 | /* Driver of optimization process |
d06865bf | 2 | Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
0850f694 | 3 | 2011, 2012 Free Software Foundation, Inc. |
1c4a429a JH |
4 | Contributed by Jan Hubicka |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
1c4a429a JH |
11 | version. |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
1c4a429a | 21 | |
9c8305f8 | 22 | /* This module implements main driver of compilation process. |
18c6ada9 JH |
23 | |
24 | The main scope of this file is to act as an interface in between | |
9c8305f8 | 25 | tree based frontends and the backend. |
18c6ada9 JH |
26 | |
27 | The front-end is supposed to use following functionality: | |
28 | ||
29 | - cgraph_finalize_function | |
30 | ||
31 | This function is called once front-end has parsed whole body of function | |
32 | and it is certain that the function body nor the declaration will change. | |
33 | ||
efe75b6f JH |
34 | (There is one exception needed for implementing GCC extern inline |
35 | function.) | |
18c6ada9 | 36 | |
047ae098 | 37 | - varpool_finalize_decl |
18c6ada9 | 38 | |
1ae58c30 | 39 | This function has same behavior as the above but is used for static |
18c6ada9 JH |
40 | variables. |
41 | ||
65d630d4 JH |
42 | - add_asm_node |
43 | ||
44 | Insert new toplevel ASM statement | |
45 | ||
46 | - finalize_compilation_unit | |
18c6ada9 | 47 | |
efe75b6f JH |
48 | This function is called once (source level) compilation unit is finalized |
49 | and it will no longer change. | |
18c6ada9 | 50 | |
9c8305f8 JH |
51 | The symbol table is constructed starting from the trivially needed |
52 | symbols finalized by the frontend. Functions are lowered into | |
53 | GIMPLE representation and callgraph/reference lists are constructed. | |
073a8998 | 54 | Those are used to discover other necessary functions and variables. |
9c8305f8 JH |
55 | |
56 | At the end the bodies of unreachable functions are removed. | |
18c6ada9 | 57 | |
efe75b6f | 58 | The function can be called multiple times when multiple source level |
9c8305f8 | 59 | compilation units are combined. |
18c6ada9 | 60 | |
65d630d4 | 61 | - compile |
18c6ada9 | 62 | |
9c8305f8 JH |
63 | This passes control to the back-end. Optimizations are performed and |
64 | final assembler is generated. This is done in the following way. Note | |
65 | that with link time optimization the process is split into three | |
66 | stages (compile time, linktime analysis and parallel linktime as | |
67 | indicated bellow). | |
68 | ||
69 | Compile time: | |
70 | ||
71 | 1) Inter-procedural optimization. | |
72 | (ipa_passes) | |
73 | ||
74 | This part is further split into: | |
75 | ||
76 | a) early optimizations. These are local passes executed in | |
77 | the topological order on the callgraph. | |
78 | ||
79 | The purpose of early optimiations is to optimize away simple | |
80 | things that may otherwise confuse IP analysis. Very simple | |
81 | propagation across the callgraph is done i.e. to discover | |
82 | functions without side effects and simple inlining is performed. | |
83 | ||
84 | b) early small interprocedural passes. | |
85 | ||
86 | Those are interprocedural passes executed only at compilation | |
87 | time. These include, for exmaple, transational memory lowering, | |
88 | unreachable code removal and other simple transformations. | |
89 | ||
90 | c) IP analysis stage. All interprocedural passes do their | |
91 | analysis. | |
92 | ||
93 | Interprocedural passes differ from small interprocedural | |
94 | passes by their ability to operate across whole program | |
95 | at linktime. Their analysis stage is performed early to | |
96 | both reduce linking times and linktime memory usage by | |
97 | not having to represent whole program in memory. | |
98 | ||
99 | d) LTO sreaming. When doing LTO, everything important gets | |
100 | streamed into the object file. | |
101 | ||
102 | Compile time and or linktime analysis stage (WPA): | |
103 | ||
104 | At linktime units gets streamed back and symbol table is | |
105 | merged. Function bodies are not streamed in and not | |
106 | available. | |
107 | e) IP propagation stage. All IP passes execute their | |
108 | IP propagation. This is done based on the earlier analysis | |
109 | without having function bodies at hand. | |
110 | f) Ltrans streaming. When doing WHOPR LTO, the program | |
111 | is partitioned and streamed into multple object files. | |
18c6ada9 | 112 | |
9c8305f8 | 113 | Compile time and/or parallel linktime stage (ltrans) |
18c6ada9 | 114 | |
9c8305f8 JH |
115 | Each of the object files is streamed back and compiled |
116 | separately. Now the function bodies becomes available | |
117 | again. | |
18c6ada9 | 118 | |
9c8305f8 JH |
119 | 2) Virtual clone materialization |
120 | (cgraph_materialize_clone) | |
18c6ada9 | 121 | |
9c8305f8 JH |
122 | IP passes can produce copies of existing functoins (such |
123 | as versioned clones or inline clones) without actually | |
124 | manipulating their bodies by creating virtual clones in | |
125 | the callgraph. At this time the virtual clones are | |
126 | turned into real functions | |
127 | 3) IP transformation | |
18c6ada9 | 128 | |
9c8305f8 JH |
129 | All IP passes transform function bodies based on earlier |
130 | decision of the IP propagation. | |
18c6ada9 | 131 | |
9c8305f8 | 132 | 4) late small IP passes |
18c6ada9 | 133 | |
9c8305f8 | 134 | Simple IP passes working within single program partition. |
18c6ada9 | 135 | |
9c8305f8 | 136 | 5) Expansion |
65d630d4 | 137 | (expand_all_functions) |
18c6ada9 | 138 | |
9c8305f8 JH |
139 | At this stage functions that needs to be output into |
140 | assembler are identified and compiled in topological order | |
141 | 6) Output of variables and aliases | |
142 | Now it is known what variable references was not optimized | |
143 | out and thus all variables are output to the file. | |
18c6ada9 | 144 | |
9c8305f8 JH |
145 | Note that with -fno-toplevel-reorder passes 5 and 6 |
146 | are combined together in cgraph_output_in_order. | |
18c6ada9 | 147 | |
9c8305f8 JH |
148 | Finally there are functions to manipulate the callgraph from |
149 | backend. | |
150 | - cgraph_add_new_function is used to add backend produced | |
151 | functions introduced after the unit is finalized. | |
152 | The functions are enqueue for later processing and inserted | |
153 | into callgraph with cgraph_process_new_functions. | |
9b3e897d | 154 | |
9c8305f8 JH |
155 | - cgraph_function_versioning |
156 | ||
157 | produces a copy of function into new one (a version) | |
158 | and apply simple transformations | |
159 | */ | |
6674a6ce | 160 | |
1c4a429a JH |
161 | #include "config.h" |
162 | #include "system.h" | |
163 | #include "coretypes.h" | |
164 | #include "tm.h" | |
165 | #include "tree.h" | |
0878843f | 166 | #include "output.h" |
c9b9aa64 | 167 | #include "rtl.h" |
6674a6ce | 168 | #include "tree-flow.h" |
1c4a429a JH |
169 | #include "tree-inline.h" |
170 | #include "langhooks.h" | |
0c58f841 | 171 | #include "pointer-set.h" |
1c4a429a JH |
172 | #include "toplev.h" |
173 | #include "flags.h" | |
174 | #include "ggc.h" | |
175 | #include "debug.h" | |
176 | #include "target.h" | |
177 | #include "cgraph.h" | |
dafc5b82 | 178 | #include "diagnostic.h" |
b58b1157 JH |
179 | #include "params.h" |
180 | #include "fibheap.h" | |
dc0bfe6a | 181 | #include "intl.h" |
902edd36 | 182 | #include "function.h" |
57fb5341 | 183 | #include "ipa-prop.h" |
726a989a RB |
184 | #include "gimple.h" |
185 | #include "tree-iterator.h" | |
b4861090 | 186 | #include "tree-pass.h" |
a406865a | 187 | #include "tree-dump.h" |
9c8305f8 | 188 | #include "gimple-pretty-print.h" |
cd9c7bd2 | 189 | #include "output.h" |
3baf459d | 190 | #include "coverage.h" |
090fa0ab | 191 | #include "plugin.h" |
632b4f8e | 192 | #include "ipa-inline.h" |
af8bca3c | 193 | #include "ipa-utils.h" |
47c79d56 | 194 | #include "lto-streamer.h" |
452aa9c5 | 195 | #include "except.h" |
0878843f | 196 | #include "regset.h" /* FIXME: For reg_obstack. */ |
b58b1157 | 197 | |
66058468 JH |
198 | /* Queue of cgraph nodes scheduled to be added into cgraph. This is a |
199 | secondary queue used during optimization to accommodate passes that | |
200 | may generate new functions that need to be optimized and expanded. */ | |
201 | cgraph_node_set cgraph_new_nodes; | |
202 | ||
65d630d4 JH |
203 | static void expand_all_functions (void); |
204 | static void mark_functions_to_output (void); | |
205 | static void expand_function (struct cgraph_node *); | |
9c8305f8 | 206 | static void cgraph_analyze_function (struct cgraph_node *); |
877ab5e9 | 207 | static void handle_alias_pairs (void); |
7dff32e6 | 208 | |
0a5fa5a1 | 209 | FILE *cgraph_dump_file; |
9b3e897d | 210 | |
65d630d4 JH |
211 | /* Linked list of cgraph asm nodes. */ |
212 | struct asm_node *asm_nodes; | |
213 | ||
214 | /* Last node in cgraph_asm_nodes. */ | |
215 | static GTY(()) struct asm_node *asm_last_node; | |
216 | ||
6744a6ab JH |
217 | /* Used for vtable lookup in thunk adjusting. */ |
218 | static GTY (()) tree vtable_entry_type; | |
219 | ||
ead84f73 JH |
220 | /* Determine if function DECL is trivially needed and should stay in the |
221 | compilation unit. This is used at the symbol table construction time | |
073a8998 | 222 | and differs from later logic removing unnecessary functions that can |
ead84f73 | 223 | take into account results of analysis, whole program info etc. */ |
8dafba3c | 224 | |
9c8305f8 | 225 | static bool |
d7f09764 | 226 | cgraph_decide_is_function_needed (struct cgraph_node *node, tree decl) |
8dafba3c | 227 | { |
e7d6beb0 | 228 | /* If the user told us it is used, then it must be so. */ |
ead84f73 | 229 | if (node->symbol.force_output) |
386b46cf JH |
230 | return true; |
231 | ||
ead84f73 JH |
232 | /* Double check that no one output the function into assembly file |
233 | early. */ | |
234 | gcc_checking_assert (!DECL_ASSEMBLER_NAME_SET_P (decl) | |
235 | || (node->thunk.thunk_p || node->same_body_alias) | |
236 | || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))); | |
e7d6beb0 | 237 | |
a1d31187 | 238 | |
ead84f73 JH |
239 | /* Keep constructors, destructors and virtual functions. */ |
240 | if (DECL_STATIC_CONSTRUCTOR (decl) | |
241 | || DECL_STATIC_DESTRUCTOR (decl) | |
242 | || (DECL_VIRTUAL_P (decl) | |
243 | && optimize && (DECL_COMDAT (decl) || DECL_EXTERNAL (decl)))) | |
244 | return true; | |
8dafba3c RH |
245 | |
246 | /* Externally visible functions must be output. The exception is | |
ead84f73 | 247 | COMDAT functions that must be output only when they are needed. */ |
04f77d0f | 248 | |
ead84f73 | 249 | if (TREE_PUBLIC (decl) |
ce91e74c | 250 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) |
8dafba3c RH |
251 | return true; |
252 | ||
8dafba3c RH |
253 | return false; |
254 | } | |
255 | ||
66058468 JH |
256 | /* Head of the queue of nodes to be processed while building callgraph */ |
257 | ||
258 | static symtab_node first = (symtab_node)(void *)1; | |
259 | ||
260 | /* Add NODE to queue starting at FIRST. | |
261 | The queue is linked via AUX pointers and terminated by pointer to 1. */ | |
262 | ||
263 | static void | |
264 | enqueue_node (symtab_node node) | |
265 | { | |
266 | if (node->symbol.aux) | |
267 | return; | |
268 | gcc_checking_assert (first); | |
269 | node->symbol.aux = first; | |
270 | first = node; | |
271 | } | |
272 | ||
d60ab196 | 273 | /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these |
f45e0ad1 JH |
274 | functions into callgraph in a way so they look like ordinary reachable |
275 | functions inserted into callgraph already at construction time. */ | |
276 | ||
277 | bool | |
278 | cgraph_process_new_functions (void) | |
279 | { | |
280 | bool output = false; | |
281 | tree fndecl; | |
282 | struct cgraph_node *node; | |
66058468 | 283 | cgraph_node_set_iterator csi; |
f45e0ad1 | 284 | |
66058468 JH |
285 | if (!cgraph_new_nodes) |
286 | return false; | |
877ab5e9 | 287 | handle_alias_pairs (); |
f45e0ad1 JH |
288 | /* Note that this queue may grow as its being processed, as the new |
289 | functions may generate new ones. */ | |
66058468 | 290 | for (csi = csi_start (cgraph_new_nodes); !csi_end_p (csi); csi_next (&csi)) |
f45e0ad1 | 291 | { |
66058468 | 292 | node = csi_node (csi); |
960bfb69 | 293 | fndecl = node->symbol.decl; |
f45e0ad1 JH |
294 | switch (cgraph_state) |
295 | { | |
296 | case CGRAPH_STATE_CONSTRUCTION: | |
297 | /* At construction time we just need to finalize function and move | |
298 | it into reachable functions list. */ | |
299 | ||
f45e0ad1 | 300 | cgraph_finalize_function (fndecl, false); |
f45e0ad1 | 301 | output = true; |
4d5dcfb2 | 302 | cgraph_call_function_insertion_hooks (node); |
66058468 | 303 | enqueue_node ((symtab_node) node); |
f45e0ad1 JH |
304 | break; |
305 | ||
306 | case CGRAPH_STATE_IPA: | |
7a388ee4 | 307 | case CGRAPH_STATE_IPA_SSA: |
f45e0ad1 JH |
308 | /* When IPA optimization already started, do all essential |
309 | transformations that has been already performed on the whole | |
310 | cgraph but not on this function. */ | |
311 | ||
726a989a | 312 | gimple_register_cfg_hooks (); |
f45e0ad1 JH |
313 | if (!node->analyzed) |
314 | cgraph_analyze_function (node); | |
315 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
7a388ee4 JH |
316 | if ((cgraph_state == CGRAPH_STATE_IPA_SSA |
317 | && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
318 | /* When not optimizing, be sure we run early local passes anyway | |
319 | to expand OMP. */ | |
320 | || !optimize) | |
8ddbbcae | 321 | execute_pass_list (pass_early_local_passes.pass.sub); |
bb7e6d55 | 322 | else |
632b4f8e | 323 | compute_inline_parameters (node, true); |
f45e0ad1 JH |
324 | free_dominance_info (CDI_POST_DOMINATORS); |
325 | free_dominance_info (CDI_DOMINATORS); | |
326 | pop_cfun (); | |
4d5dcfb2 | 327 | cgraph_call_function_insertion_hooks (node); |
f45e0ad1 JH |
328 | break; |
329 | ||
330 | case CGRAPH_STATE_EXPANSION: | |
331 | /* Functions created during expansion shall be compiled | |
332 | directly. */ | |
257eb6e3 | 333 | node->process = 0; |
4d5dcfb2 | 334 | cgraph_call_function_insertion_hooks (node); |
65d630d4 | 335 | expand_function (node); |
f45e0ad1 JH |
336 | break; |
337 | ||
338 | default: | |
339 | gcc_unreachable (); | |
340 | break; | |
341 | } | |
342 | } | |
66058468 JH |
343 | free_cgraph_node_set (cgraph_new_nodes); |
344 | cgraph_new_nodes = NULL; | |
f45e0ad1 JH |
345 | return output; |
346 | } | |
347 | ||
d71cc23f JH |
348 | /* As an GCC extension we allow redefinition of the function. The |
349 | semantics when both copies of bodies differ is not well defined. | |
350 | We replace the old body with new body so in unit at a time mode | |
351 | we always use new body, while in normal mode we may end up with | |
352 | old body inlined into some functions and new body expanded and | |
353 | inlined in others. | |
354 | ||
355 | ??? It may make more sense to use one body for inlining and other | |
356 | body for expanding the function but this is difficult to do. */ | |
357 | ||
358 | static void | |
359 | cgraph_reset_node (struct cgraph_node *node) | |
360 | { | |
257eb6e3 | 361 | /* If node->process is set, then we have already begun whole-unit analysis. |
7e8b322a JH |
362 | This is *not* testing for whether we've already emitted the function. |
363 | That case can be sort-of legitimately seen with real function redefinition | |
364 | errors. I would argue that the front end should never present us with | |
365 | such a case, but don't enforce that for now. */ | |
257eb6e3 | 366 | gcc_assert (!node->process); |
d71cc23f JH |
367 | |
368 | /* Reset our data structures so we can analyze the function again. */ | |
369 | memset (&node->local, 0, sizeof (node->local)); | |
370 | memset (&node->global, 0, sizeof (node->global)); | |
371 | memset (&node->rtl, 0, sizeof (node->rtl)); | |
372 | node->analyzed = false; | |
d71cc23f JH |
373 | node->local.finalized = false; |
374 | ||
d71cc23f | 375 | cgraph_node_remove_callees (node); |
d71cc23f | 376 | } |
d853a20e | 377 | |
838ff415 JH |
378 | /* Return true when there are references to NODE. */ |
379 | ||
380 | static bool | |
381 | referred_to_p (symtab_node node) | |
382 | { | |
838ff415 JH |
383 | struct ipa_ref *ref; |
384 | ||
073a8998 | 385 | /* See if there are any references at all. */ |
65d630d4 | 386 | if (ipa_ref_list_referring_iterate (&node->symbol.ref_list, 0, ref)) |
838ff415 | 387 | return true; |
65d630d4 | 388 | /* For functions check also calls. */ |
5d59b5e1 LC |
389 | cgraph_node *cn = dyn_cast <cgraph_node> (node); |
390 | if (cn && cn->callers) | |
838ff415 JH |
391 | return true; |
392 | return false; | |
393 | } | |
394 | ||
6b00c969 RH |
395 | /* DECL has been parsed. Take it, queue it, compile it at the whim of the |
396 | logic in effect. If NESTED is true, then our caller cannot stand to have | |
397 | the garbage collector run at the moment. We would need to either create | |
398 | a new GC context, or just not compile right now. */ | |
1c4a429a JH |
399 | |
400 | void | |
6b00c969 | 401 | cgraph_finalize_function (tree decl, bool nested) |
1c4a429a | 402 | { |
a358e188 | 403 | struct cgraph_node *node = cgraph_get_create_node (decl); |
1c4a429a | 404 | |
d853a20e | 405 | if (node->local.finalized) |
b125ad45 JH |
406 | { |
407 | cgraph_reset_node (node); | |
408 | node->local.redefined_extern_inline = true; | |
409 | } | |
6b00c969 | 410 | |
d853a20e | 411 | notice_global_symbol (decl); |
f6981e16 | 412 | node->local.finalized = true; |
e21aff8a | 413 | node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL; |
1c4a429a | 414 | |
ead84f73 JH |
415 | /* With -fkeep-inline-functions we are keeping all inline functions except |
416 | for extern inline ones. */ | |
417 | if (flag_keep_inline_functions | |
418 | && DECL_DECLARED_INLINE_P (decl) | |
419 | && !DECL_EXTERNAL (decl) | |
420 | && !DECL_DISREGARD_INLINE_LIMITS (decl)) | |
421 | node->symbol.force_output = 1; | |
8dafba3c | 422 | |
ead84f73 JH |
423 | /* When not optimizing, also output the static functions. (see |
424 | PR24561), but don't do so for always_inline functions, functions | |
425 | declared inline and nested functions. These were optimized out | |
426 | in the original implementation and it is unclear whether we want | |
427 | to change the behavior here. */ | |
428 | if ((!optimize | |
429 | && !node->same_body_alias | |
430 | && !DECL_DISREGARD_INLINE_LIMITS (decl) | |
431 | && !DECL_DECLARED_INLINE_P (decl) | |
432 | && !(DECL_CONTEXT (decl) | |
433 | && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)) | |
434 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) | |
435 | node->symbol.force_output = 1; | |
436 | ||
8dafba3c | 437 | /* If we've not yet emitted decl, tell the debug info about it. */ |
6b00c969 | 438 | if (!TREE_ASM_WRITTEN (decl)) |
8dafba3c | 439 | (*debug_hooks->deferred_inline_function) (decl); |
d173e685 | 440 | |
902edd36 JH |
441 | /* Possibly warn about unused parameters. */ |
442 | if (warn_unused_parameter) | |
443 | do_warn_unused_parameter (decl); | |
7e8b322a JH |
444 | |
445 | if (!nested) | |
446 | ggc_collect (); | |
838ff415 JH |
447 | |
448 | if (cgraph_state == CGRAPH_STATE_CONSTRUCTION | |
449 | && (cgraph_decide_is_function_needed (node, decl) | |
450 | || referred_to_p ((symtab_node)node))) | |
451 | enqueue_node ((symtab_node)node); | |
1c4a429a JH |
452 | } |
453 | ||
452aa9c5 RG |
454 | /* Add the function FNDECL to the call graph. |
455 | Unlike cgraph_finalize_function, this function is intended to be used | |
456 | by middle end and allows insertion of new function at arbitrary point | |
457 | of compilation. The function can be either in high, low or SSA form | |
458 | GIMPLE. | |
459 | ||
460 | The function is assumed to be reachable and have address taken (so no | |
461 | API breaking optimizations are performed on it). | |
462 | ||
463 | Main work done by this function is to enqueue the function for later | |
464 | processing to avoid need the passes to be re-entrant. */ | |
465 | ||
466 | void | |
467 | cgraph_add_new_function (tree fndecl, bool lowered) | |
468 | { | |
469 | struct cgraph_node *node; | |
470 | switch (cgraph_state) | |
471 | { | |
66058468 JH |
472 | case CGRAPH_STATE_PARSING: |
473 | cgraph_finalize_function (fndecl, false); | |
474 | break; | |
452aa9c5 RG |
475 | case CGRAPH_STATE_CONSTRUCTION: |
476 | /* Just enqueue function to be processed at nearest occurrence. */ | |
477 | node = cgraph_create_node (fndecl); | |
452aa9c5 RG |
478 | if (lowered) |
479 | node->lowered = true; | |
66058468 JH |
480 | if (!cgraph_new_nodes) |
481 | cgraph_new_nodes = cgraph_node_set_new (); | |
482 | cgraph_node_set_add (cgraph_new_nodes, node); | |
452aa9c5 RG |
483 | break; |
484 | ||
485 | case CGRAPH_STATE_IPA: | |
486 | case CGRAPH_STATE_IPA_SSA: | |
487 | case CGRAPH_STATE_EXPANSION: | |
488 | /* Bring the function into finalized state and enqueue for later | |
489 | analyzing and compilation. */ | |
490 | node = cgraph_get_create_node (fndecl); | |
491 | node->local.local = false; | |
492 | node->local.finalized = true; | |
93a18a70 | 493 | node->symbol.force_output = true; |
452aa9c5 RG |
494 | if (!lowered && cgraph_state == CGRAPH_STATE_EXPANSION) |
495 | { | |
496 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
452aa9c5 RG |
497 | gimple_register_cfg_hooks (); |
498 | bitmap_obstack_initialize (NULL); | |
499 | execute_pass_list (all_lowering_passes); | |
500 | execute_pass_list (pass_early_local_passes.pass.sub); | |
501 | bitmap_obstack_release (NULL); | |
502 | pop_cfun (); | |
452aa9c5 RG |
503 | |
504 | lowered = true; | |
505 | } | |
506 | if (lowered) | |
507 | node->lowered = true; | |
66058468 JH |
508 | if (!cgraph_new_nodes) |
509 | cgraph_new_nodes = cgraph_node_set_new (); | |
510 | cgraph_node_set_add (cgraph_new_nodes, node); | |
452aa9c5 RG |
511 | break; |
512 | ||
513 | case CGRAPH_STATE_FINISHED: | |
514 | /* At the very end of compilation we have to do all the work up | |
515 | to expansion. */ | |
516 | node = cgraph_create_node (fndecl); | |
517 | if (lowered) | |
518 | node->lowered = true; | |
519 | cgraph_analyze_function (node); | |
520 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
452aa9c5 RG |
521 | gimple_register_cfg_hooks (); |
522 | bitmap_obstack_initialize (NULL); | |
523 | if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
524 | execute_pass_list (pass_early_local_passes.pass.sub); | |
525 | bitmap_obstack_release (NULL); | |
452aa9c5 | 526 | pop_cfun (); |
65d630d4 | 527 | expand_function (node); |
452aa9c5 RG |
528 | break; |
529 | ||
530 | default: | |
531 | gcc_unreachable (); | |
532 | } | |
533 | ||
534 | /* Set a personality if required and we already passed EH lowering. */ | |
535 | if (lowered | |
536 | && (function_needs_eh_personality (DECL_STRUCT_FUNCTION (fndecl)) | |
537 | == eh_personality_lang)) | |
538 | DECL_FUNCTION_PERSONALITY (fndecl) = lang_hooks.eh_personality (); | |
539 | } | |
540 | ||
65d630d4 JH |
541 | /* Add a top-level asm statement to the list. */ |
542 | ||
543 | struct asm_node * | |
544 | add_asm_node (tree asm_str) | |
545 | { | |
546 | struct asm_node *node; | |
547 | ||
548 | node = ggc_alloc_cleared_asm_node (); | |
549 | node->asm_str = asm_str; | |
550 | node->order = symtab_order++; | |
551 | node->next = NULL; | |
552 | if (asm_nodes == NULL) | |
553 | asm_nodes = node; | |
554 | else | |
555 | asm_last_node->next = node; | |
556 | asm_last_node = node; | |
557 | return node; | |
558 | } | |
559 | ||
474eccc6 ILT |
560 | /* Output all asm statements we have stored up to be output. */ |
561 | ||
562 | static void | |
65d630d4 | 563 | output_asm_statements (void) |
474eccc6 | 564 | { |
65d630d4 | 565 | struct asm_node *can; |
474eccc6 | 566 | |
1da2ed5f | 567 | if (seen_error ()) |
474eccc6 ILT |
568 | return; |
569 | ||
65d630d4 | 570 | for (can = asm_nodes; can; can = can->next) |
474eccc6 | 571 | assemble_asm (can->asm_str); |
65d630d4 JH |
572 | asm_nodes = NULL; |
573 | } | |
574 | ||
575 | /* C++ FE sometimes change linkage flags after producing same body aliases. */ | |
576 | void | |
577 | fixup_same_cpp_alias_visibility (symtab_node node, symtab_node target, tree alias) | |
578 | { | |
579 | DECL_VIRTUAL_P (node->symbol.decl) = DECL_VIRTUAL_P (alias); | |
580 | if (TREE_PUBLIC (node->symbol.decl)) | |
581 | { | |
582 | DECL_EXTERNAL (node->symbol.decl) = DECL_EXTERNAL (alias); | |
583 | DECL_COMDAT (node->symbol.decl) = DECL_COMDAT (alias); | |
584 | DECL_COMDAT_GROUP (node->symbol.decl) = DECL_COMDAT_GROUP (alias); | |
585 | if (DECL_ONE_ONLY (alias) | |
586 | && !node->symbol.same_comdat_group) | |
587 | symtab_add_to_same_comdat_group ((symtab_node)node, (symtab_node)target); | |
588 | } | |
474eccc6 ILT |
589 | } |
590 | ||
e767b5be | 591 | /* Analyze the function scheduled to be output. */ |
9c8305f8 | 592 | static void |
e767b5be JH |
593 | cgraph_analyze_function (struct cgraph_node *node) |
594 | { | |
960bfb69 | 595 | tree decl = node->symbol.decl; |
9c8305f8 JH |
596 | location_t saved_loc = input_location; |
597 | input_location = DECL_SOURCE_LOCATION (decl); | |
e767b5be | 598 | |
39e2db00 JH |
599 | if (node->alias && node->thunk.alias) |
600 | { | |
601 | struct cgraph_node *tgt = cgraph_get_node (node->thunk.alias); | |
5ee770bf JH |
602 | struct cgraph_node *n; |
603 | ||
604 | for (n = tgt; n && n->alias; | |
605 | n = n->analyzed ? cgraph_alias_aliased_node (n) : NULL) | |
606 | if (n == node) | |
607 | { | |
960bfb69 | 608 | error ("function %q+D part of alias cycle", node->symbol.decl); |
5ee770bf | 609 | node->alias = false; |
9c8305f8 | 610 | input_location = saved_loc; |
5ee770bf JH |
611 | return; |
612 | } | |
960bfb69 | 613 | if (!VEC_length (ipa_ref_t, node->symbol.ref_list.references)) |
5932a4d4 JH |
614 | ipa_record_reference ((symtab_node)node, (symtab_node)tgt, |
615 | IPA_REF_ALIAS, NULL); | |
39e2db00 JH |
616 | if (node->same_body_alias) |
617 | { | |
960bfb69 | 618 | DECL_DECLARED_INLINE_P (node->symbol.decl) |
39e2db00 | 619 | = DECL_DECLARED_INLINE_P (node->thunk.alias); |
960bfb69 | 620 | DECL_DISREGARD_INLINE_LIMITS (node->symbol.decl) |
39e2db00 | 621 | = DECL_DISREGARD_INLINE_LIMITS (node->thunk.alias); |
65d630d4 | 622 | fixup_same_cpp_alias_visibility ((symtab_node) node, (symtab_node) tgt, node->thunk.alias); |
39e2db00 JH |
623 | } |
624 | ||
960bfb69 | 625 | if (node->symbol.address_taken) |
39e2db00 | 626 | cgraph_mark_address_taken_node (cgraph_alias_aliased_node (node)); |
39e2db00 JH |
627 | } |
628 | else if (node->thunk.thunk_p) | |
c47d0034 JH |
629 | { |
630 | cgraph_create_edge (node, cgraph_get_node (node->thunk.alias), | |
631 | NULL, 0, CGRAPH_FREQ_BASE); | |
632 | } | |
3649b9b7 ST |
633 | else if (node->dispatcher_function) |
634 | { | |
635 | /* Generate the dispatcher body of multi-versioned functions. */ | |
636 | struct cgraph_function_version_info *dispatcher_version_info | |
637 | = get_cgraph_node_version (node); | |
638 | if (dispatcher_version_info != NULL | |
639 | && (dispatcher_version_info->dispatcher_resolver | |
640 | == NULL_TREE)) | |
641 | { | |
642 | tree resolver = NULL_TREE; | |
643 | gcc_assert (targetm.generate_version_dispatcher_body); | |
644 | resolver = targetm.generate_version_dispatcher_body (node); | |
645 | gcc_assert (resolver != NULL_TREE); | |
646 | } | |
647 | } | |
c47d0034 JH |
648 | else |
649 | { | |
c47d0034 | 650 | push_cfun (DECL_STRUCT_FUNCTION (decl)); |
a406865a | 651 | |
960bfb69 | 652 | assign_assembler_name_if_neeeded (node->symbol.decl); |
0e0a1359 | 653 | |
c47d0034 JH |
654 | /* Make sure to gimplify bodies only once. During analyzing a |
655 | function we lower it, which will require gimplified nested | |
656 | functions, so we can end up here with an already gimplified | |
657 | body. */ | |
355a7673 | 658 | if (!gimple_has_body_p (decl)) |
c47d0034 JH |
659 | gimplify_function_tree (decl); |
660 | dump_function (TDI_generic, decl); | |
a406865a | 661 | |
26eb69c6 RG |
662 | /* Lower the function. */ |
663 | if (!node->lowered) | |
664 | { | |
665 | if (node->nested) | |
960bfb69 | 666 | lower_nested_functions (node->symbol.decl); |
26eb69c6 RG |
667 | gcc_assert (!node->nested); |
668 | ||
669 | gimple_register_cfg_hooks (); | |
670 | bitmap_obstack_initialize (NULL); | |
671 | execute_pass_list (all_lowering_passes); | |
672 | free_dominance_info (CDI_POST_DOMINATORS); | |
673 | free_dominance_info (CDI_DOMINATORS); | |
674 | compact_blocks (); | |
675 | bitmap_obstack_release (NULL); | |
676 | node->lowered = true; | |
677 | } | |
678 | ||
c47d0034 JH |
679 | pop_cfun (); |
680 | } | |
6a84c098 | 681 | node->analyzed = true; |
e767b5be | 682 | |
9c8305f8 | 683 | input_location = saved_loc; |
e767b5be JH |
684 | } |
685 | ||
39e2db00 JH |
686 | /* C++ frontend produce same body aliases all over the place, even before PCH |
687 | gets streamed out. It relies on us linking the aliases with their function | |
688 | in order to do the fixups, but ipa-ref is not PCH safe. Consequentely we | |
689 | first produce aliases without links, but once C++ FE is sure he won't sream | |
690 | PCH we build the links via this function. */ | |
691 | ||
692 | void | |
693 | cgraph_process_same_body_aliases (void) | |
694 | { | |
695 | struct cgraph_node *node; | |
65c70e6b | 696 | FOR_EACH_FUNCTION (node) |
39e2db00 | 697 | if (node->same_body_alias |
960bfb69 | 698 | && !VEC_length (ipa_ref_t, node->symbol.ref_list.references)) |
39e2db00 JH |
699 | { |
700 | struct cgraph_node *tgt = cgraph_get_node (node->thunk.alias); | |
5932a4d4 JH |
701 | ipa_record_reference ((symtab_node)node, (symtab_node)tgt, |
702 | IPA_REF_ALIAS, NULL); | |
39e2db00 JH |
703 | } |
704 | same_body_aliases_done = true; | |
705 | } | |
706 | ||
768e3c60 RG |
707 | /* Process attributes common for vars and functions. */ |
708 | ||
709 | static void | |
710 | process_common_attributes (tree decl) | |
711 | { | |
712 | tree weakref = lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)); | |
713 | ||
714 | if (weakref && !lookup_attribute ("alias", DECL_ATTRIBUTES (decl))) | |
715 | { | |
716 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
717 | "%<weakref%> attribute should be accompanied with" | |
718 | " an %<alias%> attribute"); | |
719 | DECL_WEAK (decl) = 0; | |
779d4b91 JH |
720 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", |
721 | DECL_ATTRIBUTES (decl)); | |
768e3c60 RG |
722 | } |
723 | } | |
724 | ||
386b46cf JH |
725 | /* Look for externally_visible and used attributes and mark cgraph nodes |
726 | accordingly. | |
727 | ||
728 | We cannot mark the nodes at the point the attributes are processed (in | |
729 | handle_*_attribute) because the copy of the declarations available at that | |
730 | point may not be canonical. For example, in: | |
731 | ||
732 | void f(); | |
733 | void f() __attribute__((used)); | |
734 | ||
735 | the declaration we see in handle_used_attribute will be the second | |
736 | declaration -- but the front end will subsequently merge that declaration | |
737 | with the original declaration and discard the second declaration. | |
738 | ||
739 | Furthermore, we can't mark these nodes in cgraph_finalize_function because: | |
740 | ||
741 | void f() {} | |
742 | void f() __attribute__((externally_visible)); | |
743 | ||
744 | is valid. | |
745 | ||
746 | So, we walk the nodes at the end of the translation unit, applying the | |
747 | attributes at that point. */ | |
748 | ||
749 | static void | |
750 | process_function_and_variable_attributes (struct cgraph_node *first, | |
8a4a83ed | 751 | struct varpool_node *first_var) |
386b46cf JH |
752 | { |
753 | struct cgraph_node *node; | |
8a4a83ed | 754 | struct varpool_node *vnode; |
386b46cf | 755 | |
2aae7680 JH |
756 | for (node = cgraph_first_function (); node != first; |
757 | node = cgraph_next_function (node)) | |
386b46cf | 758 | { |
960bfb69 | 759 | tree decl = node->symbol.decl; |
b42186f1 | 760 | if (DECL_PRESERVE_P (decl)) |
ead84f73 | 761 | cgraph_mark_force_output_node (node); |
9d602c59 | 762 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
386b46cf | 763 | { |
960bfb69 JH |
764 | if (! TREE_PUBLIC (node->symbol.decl)) |
765 | warning_at (DECL_SOURCE_LOCATION (node->symbol.decl), OPT_Wattributes, | |
c5d75364 MLI |
766 | "%<externally_visible%>" |
767 | " attribute have effect only on public objects"); | |
386b46cf | 768 | } |
779d4b91 | 769 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
39e2db00 | 770 | && (node->local.finalized && !node->alias)) |
779d4b91 | 771 | { |
960bfb69 | 772 | warning_at (DECL_SOURCE_LOCATION (node->symbol.decl), OPT_Wattributes, |
779d4b91 JH |
773 | "%<weakref%> attribute ignored" |
774 | " because function is defined"); | |
775 | DECL_WEAK (decl) = 0; | |
776 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
777 | DECL_ATTRIBUTES (decl)); | |
778 | } | |
c9fc06dc CB |
779 | |
780 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl)) | |
781 | && !DECL_DECLARED_INLINE_P (decl) | |
782 | /* redefining extern inline function makes it DECL_UNINLINABLE. */ | |
783 | && !DECL_UNINLINABLE (decl)) | |
784 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
785 | "always_inline function might not be inlinable"); | |
786 | ||
768e3c60 | 787 | process_common_attributes (decl); |
386b46cf | 788 | } |
2aae7680 JH |
789 | for (vnode = varpool_first_variable (); vnode != first_var; |
790 | vnode = varpool_next_variable (vnode)) | |
386b46cf | 791 | { |
960bfb69 | 792 | tree decl = vnode->symbol.decl; |
6649df51 JH |
793 | if (DECL_EXTERNAL (decl) |
794 | && DECL_INITIAL (decl) | |
795 | && const_value_known_p (decl)) | |
796 | varpool_finalize_decl (decl); | |
b42186f1 | 797 | if (DECL_PRESERVE_P (decl)) |
66058468 | 798 | vnode->symbol.force_output = true; |
9d602c59 | 799 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
386b46cf | 800 | { |
960bfb69 JH |
801 | if (! TREE_PUBLIC (vnode->symbol.decl)) |
802 | warning_at (DECL_SOURCE_LOCATION (vnode->symbol.decl), OPT_Wattributes, | |
c5d75364 MLI |
803 | "%<externally_visible%>" |
804 | " attribute have effect only on public objects"); | |
386b46cf | 805 | } |
779d4b91 JH |
806 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
807 | && vnode->finalized | |
808 | && DECL_INITIAL (decl)) | |
809 | { | |
960bfb69 | 810 | warning_at (DECL_SOURCE_LOCATION (vnode->symbol.decl), OPT_Wattributes, |
779d4b91 JH |
811 | "%<weakref%> attribute ignored" |
812 | " because variable is initialized"); | |
813 | DECL_WEAK (decl) = 0; | |
814 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
815 | DECL_ATTRIBUTES (decl)); | |
816 | } | |
768e3c60 | 817 | process_common_attributes (decl); |
386b46cf JH |
818 | } |
819 | } | |
820 | ||
66058468 JH |
821 | /* Mark DECL as finalized. By finalizing the declaration, frontend instruct the |
822 | middle end to output the variable to asm file, if needed or externally | |
823 | visible. */ | |
824 | ||
825 | void | |
826 | varpool_finalize_decl (tree decl) | |
827 | { | |
5d59b5e1 | 828 | struct varpool_node *node = varpool_node_for_decl (decl); |
66058468 | 829 | |
387df871 | 830 | gcc_assert (TREE_STATIC (decl) || DECL_EXTERNAL (decl)); |
66058468 JH |
831 | |
832 | if (node->finalized) | |
833 | return; | |
834 | notice_global_symbol (decl); | |
835 | node->finalized = true; | |
836 | if (TREE_THIS_VOLATILE (decl) || DECL_PRESERVE_P (decl) | |
837 | /* Traditionally we do not eliminate static variables when not | |
838 | optimizing and when not doing toplevel reoder. */ | |
839 | || (!flag_toplevel_reorder && !DECL_COMDAT (node->symbol.decl) | |
840 | && !DECL_ARTIFICIAL (node->symbol.decl))) | |
841 | node->symbol.force_output = true; | |
842 | ||
843 | if (cgraph_state == CGRAPH_STATE_CONSTRUCTION | |
844 | && (decide_is_variable_needed (node, decl) | |
845 | || referred_to_p ((symtab_node)node))) | |
846 | enqueue_node ((symtab_node)node); | |
847 | if (cgraph_state >= CGRAPH_STATE_IPA_SSA) | |
848 | varpool_analyze_node (node); | |
0d6bf48c JH |
849 | /* Some frontends produce various interface variables after compilation |
850 | finished. */ | |
851 | if (cgraph_state == CGRAPH_STATE_FINISHED) | |
852 | varpool_assemble_decl (node); | |
66058468 JH |
853 | } |
854 | ||
5d59b5e1 LC |
855 | |
856 | /* Determine if a symbol NODE is finalized and needed. */ | |
857 | ||
858 | inline static bool | |
859 | symbol_finalized_and_needed (symtab_node node) | |
860 | { | |
861 | if (cgraph_node *cnode = dyn_cast <cgraph_node> (node)) | |
862 | return cnode->local.finalized | |
863 | && cgraph_decide_is_function_needed (cnode, cnode->symbol.decl); | |
864 | if (varpool_node *vnode = dyn_cast <varpool_node> (node)) | |
865 | return vnode->finalized | |
866 | && !DECL_EXTERNAL (vnode->symbol.decl) | |
867 | && decide_is_variable_needed (vnode, vnode->symbol.decl); | |
868 | return false; | |
869 | } | |
870 | ||
871 | /* Determine if a symbol NODE is finalized. */ | |
872 | ||
873 | inline static bool | |
874 | symbol_finalized (symtab_node node) | |
875 | { | |
876 | if (cgraph_node *cnode= dyn_cast <cgraph_node> (node)) | |
877 | return cnode->local.finalized; | |
878 | if (varpool_node *vnode = dyn_cast <varpool_node> (node)) | |
879 | return vnode->finalized; | |
880 | return false; | |
881 | } | |
882 | ||
883 | ||
66058468 JH |
884 | /* Discover all functions and variables that are trivially needed, analyze |
885 | them as well as all functions and variables referred by them */ | |
1c4a429a | 886 | |
151e6f24 JH |
887 | static void |
888 | cgraph_analyze_functions (void) | |
1c4a429a | 889 | { |
cd9c7bd2 | 890 | /* Keep track of already processed nodes when called multiple times for |
aabcd309 | 891 | intermodule optimization. */ |
cd9c7bd2 | 892 | static struct cgraph_node *first_analyzed; |
66058468 | 893 | struct cgraph_node *first_handled = first_analyzed; |
8a4a83ed | 894 | static struct varpool_node *first_analyzed_var; |
66058468 JH |
895 | struct varpool_node *first_handled_var = first_analyzed_var; |
896 | ||
897 | symtab_node node, next; | |
898 | int i; | |
899 | struct ipa_ref *ref; | |
900 | bool changed = true; | |
1c4a429a | 901 | |
1389294c | 902 | bitmap_obstack_initialize (NULL); |
66058468 | 903 | cgraph_state = CGRAPH_STATE_CONSTRUCTION; |
1c4a429a | 904 | |
66058468 JH |
905 | /* Analysis adds static variables that in turn adds references to new functions. |
906 | So we need to iterate the process until it stabilize. */ | |
907 | while (changed) | |
1c4a429a | 908 | { |
66058468 JH |
909 | changed = false; |
910 | process_function_and_variable_attributes (first_analyzed, | |
911 | first_analyzed_var); | |
912 | ||
913 | /* First identify the trivially needed symbols. */ | |
914 | for (node = symtab_nodes; | |
915 | node != (symtab_node)first_analyzed | |
916 | && node != (symtab_node)first_analyzed_var; node = node->symbol.next) | |
d71cc23f | 917 | { |
5d59b5e1 | 918 | if (symbol_finalized_and_needed (node)) |
66058468 JH |
919 | { |
920 | enqueue_node (node); | |
921 | if (!changed && cgraph_dump_file) | |
922 | fprintf (cgraph_dump_file, "Trivially needed symbols:"); | |
923 | changed = true; | |
924 | if (cgraph_dump_file) | |
925 | fprintf (cgraph_dump_file, " %s", symtab_node_asm_name (node)); | |
926 | } | |
927 | if (node == (symtab_node)first_analyzed | |
928 | || node == (symtab_node)first_analyzed_var) | |
929 | break; | |
d71cc23f | 930 | } |
66058468 JH |
931 | cgraph_process_new_functions (); |
932 | first_analyzed_var = varpool_first_variable (); | |
933 | first_analyzed = cgraph_first_function (); | |
cd4dea62 | 934 | |
66058468 JH |
935 | if (changed && dump_file) |
936 | fprintf (cgraph_dump_file, "\n"); | |
8dafba3c | 937 | |
66058468 JH |
938 | /* Lower representation, build callgraph edges and references for all trivially |
939 | needed symbols and all symbols referred by them. */ | |
940 | while (first != (symtab_node)(void *)1) | |
b66887e4 | 941 | { |
66058468 JH |
942 | changed = true; |
943 | node = first; | |
944 | first = (symtab_node)first->symbol.aux; | |
5d59b5e1 LC |
945 | cgraph_node *cnode = dyn_cast <cgraph_node> (node); |
946 | if (cnode && cnode->local.finalized) | |
66058468 JH |
947 | { |
948 | struct cgraph_edge *edge; | |
5d59b5e1 | 949 | tree decl = cnode->symbol.decl; |
66058468 | 950 | |
5d59b5e1 LC |
951 | /* ??? It is possible to create extern inline function |
952 | and later using weak alias attribute to kill its body. | |
953 | See gcc.c-torture/compile/20011119-1.c */ | |
66058468 JH |
954 | if (!DECL_STRUCT_FUNCTION (decl) |
955 | && (!cnode->alias || !cnode->thunk.alias) | |
3649b9b7 ST |
956 | && !cnode->thunk.thunk_p |
957 | && !cnode->dispatcher_function) | |
66058468 JH |
958 | { |
959 | cgraph_reset_node (cnode); | |
960 | cnode->local.redefined_extern_inline = true; | |
961 | continue; | |
962 | } | |
b66887e4 | 963 | |
66058468 JH |
964 | if (!cnode->analyzed) |
965 | cgraph_analyze_function (cnode); | |
6b20f353 | 966 | |
66058468 | 967 | for (edge = cnode->callees; edge; edge = edge->next_callee) |
93a18a70 | 968 | if (edge->callee->local.finalized) |
5d59b5e1 | 969 | enqueue_node ((symtab_node)edge->callee); |
66058468 | 970 | |
5d59b5e1 LC |
971 | /* If decl is a clone of an abstract function, |
972 | mark that abstract function so that we don't release its body. | |
973 | The DECL_INITIAL() of that abstract function declaration | |
974 | will be later needed to output debug info. */ | |
66058468 JH |
975 | if (DECL_ABSTRACT_ORIGIN (decl)) |
976 | { | |
5d59b5e1 LC |
977 | struct cgraph_node *origin_node |
978 | = cgraph_get_node (DECL_ABSTRACT_ORIGIN (decl)); | |
66058468 JH |
979 | origin_node->abstract_and_needed = true; |
980 | } | |
66058468 | 981 | } |
5d59b5e1 LC |
982 | else |
983 | { | |
984 | varpool_node *vnode = dyn_cast <varpool_node> (node); | |
985 | if (vnode && vnode->finalized) | |
986 | varpool_analyze_node (vnode); | |
987 | } | |
66058468 JH |
988 | |
989 | if (node->symbol.same_comdat_group) | |
990 | { | |
991 | symtab_node next; | |
992 | for (next = node->symbol.same_comdat_group; | |
993 | next != node; | |
994 | next = next->symbol.same_comdat_group) | |
995 | enqueue_node (next); | |
996 | } | |
997 | for (i = 0; ipa_ref_list_reference_iterate (&node->symbol.ref_list, i, ref); i++) | |
5d59b5e1 | 998 | if (symbol_finalized (ref->referred)) |
66058468 JH |
999 | enqueue_node (ref->referred); |
1000 | cgraph_process_new_functions (); | |
1001 | } | |
1c4a429a | 1002 | } |
8dafba3c | 1003 | |
564738df | 1004 | /* Collect entry points to the unit. */ |
a194aa56 | 1005 | if (cgraph_dump_file) |
1668aabc | 1006 | { |
7d82fe7c | 1007 | fprintf (cgraph_dump_file, "\n\nInitial "); |
8f940ee6 | 1008 | dump_symtab (cgraph_dump_file); |
1668aabc | 1009 | } |
7660e67e | 1010 | |
a194aa56 | 1011 | if (cgraph_dump_file) |
66058468 | 1012 | fprintf (cgraph_dump_file, "\nRemoving unused symbols:"); |
1c4a429a | 1013 | |
66058468 JH |
1014 | for (node = symtab_nodes; |
1015 | node != (symtab_node)first_handled | |
1016 | && node != (symtab_node)first_handled_var; node = next) | |
1c4a429a | 1017 | { |
66058468 JH |
1018 | next = node->symbol.next; |
1019 | if (!node->symbol.aux && !referred_to_p (node)) | |
1c4a429a | 1020 | { |
a194aa56 | 1021 | if (cgraph_dump_file) |
66058468 JH |
1022 | fprintf (cgraph_dump_file, " %s", symtab_node_name (node)); |
1023 | symtab_remove_node (node); | |
d71cc23f | 1024 | continue; |
1c4a429a | 1025 | } |
5d59b5e1 | 1026 | if (cgraph_node *cnode = dyn_cast <cgraph_node> (node)) |
66058468 JH |
1027 | { |
1028 | tree decl = node->symbol.decl; | |
66058468 JH |
1029 | |
1030 | if (cnode->local.finalized && !gimple_has_body_p (decl) | |
1031 | && (!cnode->alias || !cnode->thunk.alias) | |
1032 | && !cnode->thunk.thunk_p) | |
1033 | cgraph_reset_node (cnode); | |
1034 | ||
1035 | gcc_assert (!cnode->local.finalized || cnode->thunk.thunk_p | |
1036 | || cnode->alias | |
1037 | || gimple_has_body_p (decl)); | |
1038 | gcc_assert (cnode->analyzed == cnode->local.finalized); | |
1039 | } | |
1040 | node->symbol.aux = NULL; | |
1c4a429a | 1041 | } |
66058468 JH |
1042 | first_analyzed = cgraph_first_function (); |
1043 | first_analyzed_var = varpool_first_variable (); | |
a194aa56 | 1044 | if (cgraph_dump_file) |
7d82fe7c KC |
1045 | { |
1046 | fprintf (cgraph_dump_file, "\n\nReclaimed "); | |
8f940ee6 | 1047 | dump_symtab (cgraph_dump_file); |
7d82fe7c | 1048 | } |
1389294c | 1049 | bitmap_obstack_release (NULL); |
1c4a429a | 1050 | ggc_collect (); |
151e6f24 JH |
1051 | } |
1052 | ||
85ce9375 JH |
1053 | /* Translate the ugly representation of aliases as alias pairs into nice |
1054 | representation in callgraph. We don't handle all cases yet, | |
1055 | unforutnately. */ | |
1056 | ||
1057 | static void | |
1058 | handle_alias_pairs (void) | |
1059 | { | |
1060 | alias_pair *p; | |
1061 | unsigned i; | |
85ce9375 JH |
1062 | |
1063 | for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p);) | |
1064 | { | |
38e55ac9 JH |
1065 | symtab_node target_node = symtab_node_for_asm (p->target); |
1066 | ||
25e2c40d JH |
1067 | /* Weakrefs with target not defined in current unit are easy to handle; they |
1068 | behave just as external variables except we need to note the alias flag | |
1069 | to later output the weakref pseudo op into asm file. */ | |
38e55ac9 | 1070 | if (!target_node && lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)) != NULL) |
25e2c40d JH |
1071 | { |
1072 | if (TREE_CODE (p->decl) == FUNCTION_DECL) | |
1073 | cgraph_get_create_node (p->decl)->alias = true; | |
1074 | else | |
1075 | varpool_get_node (p->decl)->alias = true; | |
1076 | DECL_EXTERNAL (p->decl) = 1; | |
1077 | VEC_unordered_remove (alias_pair, alias_pairs, i); | |
38e55ac9 | 1078 | continue; |
25e2c40d | 1079 | } |
38e55ac9 | 1080 | else if (!target_node) |
85ce9375 | 1081 | { |
38e55ac9 JH |
1082 | error ("%q+D aliased to undefined symbol %qE", p->decl, p->target); |
1083 | VEC_unordered_remove (alias_pair, alias_pairs, i); | |
1084 | continue; | |
1085 | } | |
1086 | ||
1087 | /* Normally EXTERNAL flag is used to mark external inlines, | |
1088 | however for aliases it seems to be allowed to use it w/o | |
1089 | any meaning. See gcc.dg/attr-alias-3.c | |
1090 | However for weakref we insist on EXTERNAL flag being set. | |
1091 | See gcc.dg/attr-alias-5.c */ | |
1092 | if (DECL_EXTERNAL (p->decl)) | |
1093 | DECL_EXTERNAL (p->decl) | |
1094 | = lookup_attribute ("weakref", | |
1095 | DECL_ATTRIBUTES (p->decl)) != NULL; | |
85ce9375 | 1096 | |
07250f0e JH |
1097 | if (DECL_EXTERNAL (target_node->symbol.decl) |
1098 | /* We use local aliases for C++ thunks to force the tailcall | |
1099 | to bind locally. This is a hack - to keep it working do | |
1100 | the following (which is not strictly correct). */ | |
1101 | && (! TREE_CODE (target_node->symbol.decl) == FUNCTION_DECL | |
1102 | || ! DECL_VIRTUAL_P (target_node->symbol.decl)) | |
1103 | && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl))) | |
1104 | { | |
1105 | error ("%q+D aliased to external symbol %qE", | |
1106 | p->decl, p->target); | |
1107 | } | |
1108 | ||
38e55ac9 | 1109 | if (TREE_CODE (p->decl) == FUNCTION_DECL |
5d59b5e1 | 1110 | && target_node && is_a <cgraph_node> (target_node)) |
38e55ac9 JH |
1111 | { |
1112 | struct cgraph_node *src_node = cgraph_get_node (p->decl); | |
1113 | if (src_node && src_node->local.finalized) | |
1114 | cgraph_reset_node (src_node); | |
1115 | cgraph_create_function_alias (p->decl, target_node->symbol.decl); | |
1116 | VEC_unordered_remove (alias_pair, alias_pairs, i); | |
1117 | } | |
1118 | else if (TREE_CODE (p->decl) == VAR_DECL | |
5d59b5e1 | 1119 | && target_node && is_a <varpool_node> (target_node)) |
38e55ac9 JH |
1120 | { |
1121 | varpool_create_variable_alias (p->decl, target_node->symbol.decl); | |
1122 | VEC_unordered_remove (alias_pair, alias_pairs, i); | |
1123 | } | |
1124 | else | |
1125 | { | |
1126 | error ("%q+D alias in between function and variable is not supported", | |
1127 | p->decl); | |
1128 | warning (0, "%q+D aliased declaration", | |
1129 | target_node->symbol.decl); | |
1130 | VEC_unordered_remove (alias_pair, alias_pairs, i); | |
85ce9375 JH |
1131 | } |
1132 | } | |
877ab5e9 | 1133 | VEC_free (alias_pair, gc, alias_pairs); |
85ce9375 JH |
1134 | } |
1135 | ||
5f1a9ebb | 1136 | |
1c4a429a JH |
1137 | /* Figure out what functions we want to assemble. */ |
1138 | ||
1139 | static void | |
65d630d4 | 1140 | mark_functions_to_output (void) |
1c4a429a JH |
1141 | { |
1142 | struct cgraph_node *node; | |
b66887e4 JJ |
1143 | #ifdef ENABLE_CHECKING |
1144 | bool check_same_comdat_groups = false; | |
1145 | ||
65c70e6b | 1146 | FOR_EACH_FUNCTION (node) |
b66887e4 JJ |
1147 | gcc_assert (!node->process); |
1148 | #endif | |
1c4a429a | 1149 | |
65c70e6b | 1150 | FOR_EACH_FUNCTION (node) |
1c4a429a | 1151 | { |
960bfb69 | 1152 | tree decl = node->symbol.decl; |
c22cacf3 | 1153 | |
960bfb69 | 1154 | gcc_assert (!node->process || node->symbol.same_comdat_group); |
b66887e4 JJ |
1155 | if (node->process) |
1156 | continue; | |
b58b1157 | 1157 | |
7660e67e SB |
1158 | /* We need to output all local functions that are used and not |
1159 | always inlined, as well as those that are reachable from | |
1160 | outside the current compilation unit. */ | |
39ecc018 | 1161 | if (node->analyzed |
c47d0034 | 1162 | && !node->thunk.thunk_p |
39e2db00 | 1163 | && !node->alias |
18c6ada9 | 1164 | && !node->global.inlined_to |
6de9cd9a | 1165 | && !TREE_ASM_WRITTEN (decl) |
1c4a429a | 1166 | && !DECL_EXTERNAL (decl)) |
b66887e4 JJ |
1167 | { |
1168 | node->process = 1; | |
960bfb69 | 1169 | if (node->symbol.same_comdat_group) |
b66887e4 JJ |
1170 | { |
1171 | struct cgraph_node *next; | |
960bfb69 | 1172 | for (next = cgraph (node->symbol.same_comdat_group); |
b66887e4 | 1173 | next != node; |
960bfb69 | 1174 | next = cgraph (next->symbol.same_comdat_group)) |
39e2db00 | 1175 | if (!next->thunk.thunk_p && !next->alias) |
c47d0034 | 1176 | next->process = 1; |
b66887e4 JJ |
1177 | } |
1178 | } | |
960bfb69 | 1179 | else if (node->symbol.same_comdat_group) |
b66887e4 JJ |
1180 | { |
1181 | #ifdef ENABLE_CHECKING | |
1182 | check_same_comdat_groups = true; | |
1183 | #endif | |
1184 | } | |
341c100f | 1185 | else |
1a2caa7a NS |
1186 | { |
1187 | /* We should've reclaimed all functions that are not needed. */ | |
1188 | #ifdef ENABLE_CHECKING | |
726a989a | 1189 | if (!node->global.inlined_to |
39ecc018 | 1190 | && gimple_has_body_p (decl) |
a837268b JH |
1191 | /* FIXME: in ltrans unit when offline copy is outside partition but inline copies |
1192 | are inside partition, we can end up not removing the body since we no longer | |
1193 | have analyzed node pointing to it. */ | |
960bfb69 | 1194 | && !node->symbol.in_other_partition |
39e2db00 | 1195 | && !node->alias |
387df871 | 1196 | && !node->clones |
1a2caa7a NS |
1197 | && !DECL_EXTERNAL (decl)) |
1198 | { | |
1199 | dump_cgraph_node (stderr, node); | |
1200 | internal_error ("failed to reclaim unneeded function"); | |
1201 | } | |
1202 | #endif | |
726a989a | 1203 | gcc_assert (node->global.inlined_to |
39ecc018 | 1204 | || !gimple_has_body_p (decl) |
960bfb69 | 1205 | || node->symbol.in_other_partition |
6649df51 JH |
1206 | || node->clones |
1207 | || DECL_ARTIFICIAL (decl) | |
1a2caa7a NS |
1208 | || DECL_EXTERNAL (decl)); |
1209 | ||
1210 | } | |
c22cacf3 | 1211 | |
18d13f34 | 1212 | } |
b66887e4 JJ |
1213 | #ifdef ENABLE_CHECKING |
1214 | if (check_same_comdat_groups) | |
65c70e6b | 1215 | FOR_EACH_FUNCTION (node) |
960bfb69 | 1216 | if (node->symbol.same_comdat_group && !node->process) |
b66887e4 | 1217 | { |
960bfb69 | 1218 | tree decl = node->symbol.decl; |
b66887e4 JJ |
1219 | if (!node->global.inlined_to |
1220 | && gimple_has_body_p (decl) | |
7cbf224d RG |
1221 | /* FIXME: in an ltrans unit when the offline copy is outside a |
1222 | partition but inline copies are inside a partition, we can | |
1223 | end up not removing the body since we no longer have an | |
1224 | analyzed node pointing to it. */ | |
960bfb69 | 1225 | && !node->symbol.in_other_partition |
07250f0e | 1226 | && !node->clones |
b66887e4 JJ |
1227 | && !DECL_EXTERNAL (decl)) |
1228 | { | |
1229 | dump_cgraph_node (stderr, node); | |
7cbf224d RG |
1230 | internal_error ("failed to reclaim unneeded function in same " |
1231 | "comdat group"); | |
b66887e4 JJ |
1232 | } |
1233 | } | |
1234 | #endif | |
18d13f34 JH |
1235 | } |
1236 | ||
6744a6ab | 1237 | /* DECL is FUNCTION_DECL. Initialize datastructures so DECL is a function |
3649b9b7 | 1238 | in lowered gimple form. IN_SSA is true if the gimple is in SSA. |
6744a6ab JH |
1239 | |
1240 | Set current_function_decl and cfun to newly constructed empty function body. | |
1241 | return basic block in the function body. */ | |
1242 | ||
3649b9b7 ST |
1243 | basic_block |
1244 | init_lowered_empty_function (tree decl, bool in_ssa) | |
6744a6ab JH |
1245 | { |
1246 | basic_block bb; | |
1247 | ||
1248 | current_function_decl = decl; | |
1249 | allocate_struct_function (decl, false); | |
1250 | gimple_register_cfg_hooks (); | |
1251 | init_empty_tree_cfg (); | |
3649b9b7 ST |
1252 | |
1253 | if (in_ssa) | |
1254 | { | |
1255 | init_tree_ssa (cfun); | |
1256 | init_ssa_operands (cfun); | |
1257 | cfun->gimple_df->in_ssa_p = true; | |
1258 | } | |
1259 | ||
6744a6ab JH |
1260 | DECL_INITIAL (decl) = make_node (BLOCK); |
1261 | ||
1262 | DECL_SAVED_TREE (decl) = error_mark_node; | |
1263 | cfun->curr_properties |= | |
46eb666a | 1264 | (PROP_gimple_lcf | PROP_gimple_leh | PROP_cfg | PROP_ssa | PROP_gimple_any); |
6744a6ab JH |
1265 | |
1266 | /* Create BB for body of the function and connect it properly. */ | |
1267 | bb = create_basic_block (NULL, (void *) 0, ENTRY_BLOCK_PTR); | |
4f9c574a DV |
1268 | make_edge (ENTRY_BLOCK_PTR, bb, 0); |
1269 | make_edge (bb, EXIT_BLOCK_PTR, 0); | |
6744a6ab JH |
1270 | |
1271 | return bb; | |
1272 | } | |
1273 | ||
1274 | /* Adjust PTR by the constant FIXED_OFFSET, and by the vtable | |
1275 | offset indicated by VIRTUAL_OFFSET, if that is | |
1276 | non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and | |
1277 | zero for a result adjusting thunk. */ | |
1278 | ||
1279 | static tree | |
1280 | thunk_adjust (gimple_stmt_iterator * bsi, | |
1281 | tree ptr, bool this_adjusting, | |
1282 | HOST_WIDE_INT fixed_offset, tree virtual_offset) | |
1283 | { | |
1284 | gimple stmt; | |
1285 | tree ret; | |
1286 | ||
313333a6 RG |
1287 | if (this_adjusting |
1288 | && fixed_offset != 0) | |
6744a6ab | 1289 | { |
5d49b6a7 RG |
1290 | stmt = gimple_build_assign |
1291 | (ptr, fold_build_pointer_plus_hwi_loc (input_location, | |
1292 | ptr, | |
1293 | fixed_offset)); | |
6744a6ab JH |
1294 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1295 | } | |
1296 | ||
1297 | /* If there's a virtual offset, look up that value in the vtable and | |
1298 | adjust the pointer again. */ | |
1299 | if (virtual_offset) | |
1300 | { | |
1301 | tree vtabletmp; | |
1302 | tree vtabletmp2; | |
1303 | tree vtabletmp3; | |
6744a6ab JH |
1304 | |
1305 | if (!vtable_entry_type) | |
1306 | { | |
1307 | tree vfunc_type = make_node (FUNCTION_TYPE); | |
1308 | TREE_TYPE (vfunc_type) = integer_type_node; | |
1309 | TYPE_ARG_TYPES (vfunc_type) = NULL_TREE; | |
1310 | layout_type (vfunc_type); | |
1311 | ||
1312 | vtable_entry_type = build_pointer_type (vfunc_type); | |
1313 | } | |
1314 | ||
1315 | vtabletmp = | |
7cc434a3 | 1316 | create_tmp_reg (build_pointer_type |
7d80ca1f | 1317 | (build_pointer_type (vtable_entry_type)), "vptr"); |
6744a6ab JH |
1318 | |
1319 | /* The vptr is always at offset zero in the object. */ | |
1320 | stmt = gimple_build_assign (vtabletmp, | |
1321 | build1 (NOP_EXPR, TREE_TYPE (vtabletmp), | |
1322 | ptr)); | |
1323 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
6744a6ab JH |
1324 | |
1325 | /* Form the vtable address. */ | |
7cc434a3 | 1326 | vtabletmp2 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp)), |
7d80ca1f | 1327 | "vtableaddr"); |
6744a6ab | 1328 | stmt = gimple_build_assign (vtabletmp2, |
70f34814 | 1329 | build_simple_mem_ref (vtabletmp)); |
6744a6ab | 1330 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
6744a6ab JH |
1331 | |
1332 | /* Find the entry with the vcall offset. */ | |
1333 | stmt = gimple_build_assign (vtabletmp2, | |
5d49b6a7 RG |
1334 | fold_build_pointer_plus_loc (input_location, |
1335 | vtabletmp2, | |
1336 | virtual_offset)); | |
6744a6ab JH |
1337 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1338 | ||
1339 | /* Get the offset itself. */ | |
7cc434a3 | 1340 | vtabletmp3 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp2)), |
7d80ca1f | 1341 | "vcalloffset"); |
6744a6ab | 1342 | stmt = gimple_build_assign (vtabletmp3, |
70f34814 | 1343 | build_simple_mem_ref (vtabletmp2)); |
6744a6ab | 1344 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
6744a6ab | 1345 | |
6744a6ab | 1346 | /* Adjust the `this' pointer. */ |
0d82a1c8 RG |
1347 | ptr = fold_build_pointer_plus_loc (input_location, ptr, vtabletmp3); |
1348 | ptr = force_gimple_operand_gsi (bsi, ptr, true, NULL_TREE, false, | |
1349 | GSI_CONTINUE_LINKING); | |
6744a6ab JH |
1350 | } |
1351 | ||
313333a6 RG |
1352 | if (!this_adjusting |
1353 | && fixed_offset != 0) | |
6744a6ab JH |
1354 | /* Adjust the pointer by the constant. */ |
1355 | { | |
1356 | tree ptrtmp; | |
1357 | ||
1358 | if (TREE_CODE (ptr) == VAR_DECL) | |
1359 | ptrtmp = ptr; | |
1360 | else | |
1361 | { | |
7cc434a3 | 1362 | ptrtmp = create_tmp_reg (TREE_TYPE (ptr), "ptr"); |
6744a6ab JH |
1363 | stmt = gimple_build_assign (ptrtmp, ptr); |
1364 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
6744a6ab | 1365 | } |
5d49b6a7 RG |
1366 | ptr = fold_build_pointer_plus_hwi_loc (input_location, |
1367 | ptrtmp, fixed_offset); | |
6744a6ab JH |
1368 | } |
1369 | ||
1370 | /* Emit the statement and gimplify the adjustment expression. */ | |
7cc434a3 | 1371 | ret = create_tmp_reg (TREE_TYPE (ptr), "adjusted_this"); |
6744a6ab | 1372 | stmt = gimple_build_assign (ret, ptr); |
6744a6ab JH |
1373 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | /* Produce assembler for thunk NODE. */ | |
1379 | ||
1380 | static void | |
1381 | assemble_thunk (struct cgraph_node *node) | |
1382 | { | |
1383 | bool this_adjusting = node->thunk.this_adjusting; | |
1384 | HOST_WIDE_INT fixed_offset = node->thunk.fixed_offset; | |
1385 | HOST_WIDE_INT virtual_value = node->thunk.virtual_value; | |
1386 | tree virtual_offset = NULL; | |
1387 | tree alias = node->thunk.alias; | |
960bfb69 | 1388 | tree thunk_fndecl = node->symbol.decl; |
6744a6ab JH |
1389 | tree a = DECL_ARGUMENTS (thunk_fndecl); |
1390 | ||
1391 | current_function_decl = thunk_fndecl; | |
1392 | ||
d06865bf DK |
1393 | /* Ensure thunks are emitted in their correct sections. */ |
1394 | resolve_unique_section (thunk_fndecl, 0, flag_function_sections); | |
1395 | ||
6744a6ab JH |
1396 | if (this_adjusting |
1397 | && targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset, | |
1398 | virtual_value, alias)) | |
1399 | { | |
1400 | const char *fnname; | |
1401 | tree fn_block; | |
4399cf59 | 1402 | tree restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); |
6744a6ab JH |
1403 | |
1404 | DECL_RESULT (thunk_fndecl) | |
1405 | = build_decl (DECL_SOURCE_LOCATION (thunk_fndecl), | |
4399cf59 | 1406 | RESULT_DECL, 0, restype); |
15488554 | 1407 | fnname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk_fndecl)); |
6744a6ab JH |
1408 | |
1409 | /* The back end expects DECL_INITIAL to contain a BLOCK, so we | |
1410 | create one. */ | |
1411 | fn_block = make_node (BLOCK); | |
1412 | BLOCK_VARS (fn_block) = a; | |
1413 | DECL_INITIAL (thunk_fndecl) = fn_block; | |
1414 | init_function_start (thunk_fndecl); | |
1415 | cfun->is_thunk = 1; | |
68a55980 JJ |
1416 | insn_locations_init (); |
1417 | set_curr_insn_location (DECL_SOURCE_LOCATION (thunk_fndecl)); | |
1418 | prologue_location = curr_insn_location (); | |
6744a6ab JH |
1419 | assemble_start_function (thunk_fndecl, fnname); |
1420 | ||
1421 | targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl, | |
1422 | fixed_offset, virtual_value, alias); | |
1423 | ||
1424 | assemble_end_function (thunk_fndecl, fnname); | |
68a55980 | 1425 | insn_locations_finalize (); |
6744a6ab JH |
1426 | init_insn_lengths (); |
1427 | free_after_compilation (cfun); | |
1428 | set_cfun (NULL); | |
1429 | TREE_ASM_WRITTEN (thunk_fndecl) = 1; | |
c47d0034 JH |
1430 | node->thunk.thunk_p = false; |
1431 | node->analyzed = false; | |
6744a6ab JH |
1432 | } |
1433 | else | |
1434 | { | |
1435 | tree restype; | |
1436 | basic_block bb, then_bb, else_bb, return_bb; | |
1437 | gimple_stmt_iterator bsi; | |
1438 | int nargs = 0; | |
1439 | tree arg; | |
1440 | int i; | |
1441 | tree resdecl; | |
1442 | tree restmp = NULL; | |
1443 | VEC(tree, heap) *vargs; | |
1444 | ||
1445 | gimple call; | |
1446 | gimple ret; | |
1447 | ||
1448 | DECL_IGNORED_P (thunk_fndecl) = 1; | |
1449 | bitmap_obstack_initialize (NULL); | |
1450 | ||
1451 | if (node->thunk.virtual_offset_p) | |
1452 | virtual_offset = size_int (virtual_value); | |
1453 | ||
1454 | /* Build the return declaration for the function. */ | |
1455 | restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); | |
1456 | if (DECL_RESULT (thunk_fndecl) == NULL_TREE) | |
1457 | { | |
1458 | resdecl = build_decl (input_location, RESULT_DECL, 0, restype); | |
1459 | DECL_ARTIFICIAL (resdecl) = 1; | |
1460 | DECL_IGNORED_P (resdecl) = 1; | |
1461 | DECL_RESULT (thunk_fndecl) = resdecl; | |
1462 | } | |
1463 | else | |
1464 | resdecl = DECL_RESULT (thunk_fndecl); | |
1465 | ||
3649b9b7 | 1466 | bb = then_bb = else_bb = return_bb = init_lowered_empty_function (thunk_fndecl, true); |
6744a6ab JH |
1467 | |
1468 | bsi = gsi_start_bb (bb); | |
1469 | ||
1470 | /* Build call to the function being thunked. */ | |
1471 | if (!VOID_TYPE_P (restype)) | |
1472 | { | |
1473 | if (!is_gimple_reg_type (restype)) | |
1474 | { | |
1475 | restmp = resdecl; | |
c021f10b | 1476 | add_local_decl (cfun, restmp); |
6744a6ab JH |
1477 | BLOCK_VARS (DECL_INITIAL (current_function_decl)) = restmp; |
1478 | } | |
1479 | else | |
7cc434a3 | 1480 | restmp = create_tmp_reg (restype, "retval"); |
6744a6ab JH |
1481 | } |
1482 | ||
910ad8de | 1483 | for (arg = a; arg; arg = DECL_CHAIN (arg)) |
6744a6ab JH |
1484 | nargs++; |
1485 | vargs = VEC_alloc (tree, heap, nargs); | |
1486 | if (this_adjusting) | |
1487 | VEC_quick_push (tree, vargs, | |
1488 | thunk_adjust (&bsi, | |
1489 | a, 1, fixed_offset, | |
1490 | virtual_offset)); | |
1491 | else | |
1492 | VEC_quick_push (tree, vargs, a); | |
910ad8de | 1493 | for (i = 1, arg = DECL_CHAIN (a); i < nargs; i++, arg = DECL_CHAIN (arg)) |
46eb666a | 1494 | VEC_quick_push (tree, vargs, arg); |
6744a6ab JH |
1495 | call = gimple_build_call_vec (build_fold_addr_expr_loc (0, alias), vargs); |
1496 | VEC_free (tree, heap, vargs); | |
6744a6ab JH |
1497 | gimple_call_set_from_thunk (call, true); |
1498 | if (restmp) | |
1499 | gimple_call_set_lhs (call, restmp); | |
1500 | gsi_insert_after (&bsi, call, GSI_NEW_STMT); | |
6744a6ab JH |
1501 | |
1502 | if (restmp && !this_adjusting) | |
1503 | { | |
1124098b | 1504 | tree true_label = NULL_TREE; |
6744a6ab JH |
1505 | |
1506 | if (TREE_CODE (TREE_TYPE (restmp)) == POINTER_TYPE) | |
1507 | { | |
1508 | gimple stmt; | |
1509 | /* If the return type is a pointer, we need to | |
1510 | protect against NULL. We know there will be an | |
1511 | adjustment, because that's why we're emitting a | |
1512 | thunk. */ | |
1513 | then_bb = create_basic_block (NULL, (void *) 0, bb); | |
1514 | return_bb = create_basic_block (NULL, (void *) 0, then_bb); | |
1515 | else_bb = create_basic_block (NULL, (void *) 0, else_bb); | |
1516 | remove_edge (single_succ_edge (bb)); | |
1517 | true_label = gimple_block_label (then_bb); | |
6744a6ab | 1518 | stmt = gimple_build_cond (NE_EXPR, restmp, |
e8160c9a | 1519 | build_zero_cst (TREE_TYPE (restmp)), |
6744a6ab JH |
1520 | NULL_TREE, NULL_TREE); |
1521 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
1522 | make_edge (bb, then_bb, EDGE_TRUE_VALUE); | |
1523 | make_edge (bb, else_bb, EDGE_FALSE_VALUE); | |
1524 | make_edge (return_bb, EXIT_BLOCK_PTR, 0); | |
1525 | make_edge (then_bb, return_bb, EDGE_FALLTHRU); | |
1526 | make_edge (else_bb, return_bb, EDGE_FALLTHRU); | |
1527 | bsi = gsi_last_bb (then_bb); | |
1528 | } | |
1529 | ||
1530 | restmp = thunk_adjust (&bsi, restmp, /*this_adjusting=*/0, | |
1531 | fixed_offset, virtual_offset); | |
1532 | if (true_label) | |
1533 | { | |
1534 | gimple stmt; | |
1535 | bsi = gsi_last_bb (else_bb); | |
e8160c9a NF |
1536 | stmt = gimple_build_assign (restmp, |
1537 | build_zero_cst (TREE_TYPE (restmp))); | |
6744a6ab JH |
1538 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); |
1539 | bsi = gsi_last_bb (return_bb); | |
1540 | } | |
1541 | } | |
1542 | else | |
1543 | gimple_call_set_tail (call, true); | |
1544 | ||
1545 | /* Build return value. */ | |
1546 | ret = gimple_build_return (restmp); | |
1547 | gsi_insert_after (&bsi, ret, GSI_NEW_STMT); | |
1548 | ||
1549 | delete_unreachable_blocks (); | |
1550 | update_ssa (TODO_update_ssa); | |
1551 | ||
6744a6ab JH |
1552 | /* Since we want to emit the thunk, we explicitly mark its name as |
1553 | referenced. */ | |
c47d0034 JH |
1554 | node->thunk.thunk_p = false; |
1555 | cgraph_node_remove_callees (node); | |
6744a6ab JH |
1556 | cgraph_add_new_function (thunk_fndecl, true); |
1557 | bitmap_obstack_release (NULL); | |
1558 | } | |
1559 | current_function_decl = NULL; | |
af16bc76 | 1560 | set_cfun (NULL); |
6744a6ab JH |
1561 | } |
1562 | ||
c47d0034 | 1563 | |
39e2db00 | 1564 | |
073a8998 | 1565 | /* Assemble thunks and aliases associated to NODE. */ |
c47d0034 JH |
1566 | |
1567 | static void | |
39e2db00 | 1568 | assemble_thunks_and_aliases (struct cgraph_node *node) |
c47d0034 JH |
1569 | { |
1570 | struct cgraph_edge *e; | |
39e2db00 JH |
1571 | int i; |
1572 | struct ipa_ref *ref; | |
1573 | ||
c47d0034 JH |
1574 | for (e = node->callers; e;) |
1575 | if (e->caller->thunk.thunk_p) | |
1576 | { | |
1577 | struct cgraph_node *thunk = e->caller; | |
1578 | ||
1579 | e = e->next_caller; | |
39e2db00 | 1580 | assemble_thunks_and_aliases (thunk); |
c47d0034 JH |
1581 | assemble_thunk (thunk); |
1582 | } | |
1583 | else | |
1584 | e = e->next_caller; | |
5932a4d4 | 1585 | for (i = 0; ipa_ref_list_referring_iterate (&node->symbol.ref_list, |
960bfb69 | 1586 | i, ref); i++) |
39e2db00 JH |
1587 | if (ref->use == IPA_REF_ALIAS) |
1588 | { | |
5932a4d4 | 1589 | struct cgraph_node *alias = ipa_ref_referring_node (ref); |
42f833bc JH |
1590 | bool saved_written = TREE_ASM_WRITTEN (alias->thunk.alias); |
1591 | ||
1592 | /* Force assemble_alias to really output the alias this time instead | |
1593 | of buffering it in same alias pairs. */ | |
1594 | TREE_ASM_WRITTEN (alias->thunk.alias) = 1; | |
07250f0e JH |
1595 | do_assemble_alias (alias->symbol.decl, |
1596 | DECL_ASSEMBLER_NAME (alias->thunk.alias)); | |
39e2db00 | 1597 | assemble_thunks_and_aliases (alias); |
42f833bc | 1598 | TREE_ASM_WRITTEN (alias->thunk.alias) = saved_written; |
39e2db00 | 1599 | } |
c47d0034 JH |
1600 | } |
1601 | ||
9c8305f8 | 1602 | /* Expand function specified by NODE. */ |
0878843f | 1603 | |
452aa9c5 | 1604 | static void |
65d630d4 | 1605 | expand_function (struct cgraph_node *node) |
0878843f | 1606 | { |
9c8305f8 | 1607 | tree decl = node->symbol.decl; |
0878843f RG |
1608 | location_t saved_loc; |
1609 | ||
9c8305f8 JH |
1610 | /* We ought to not compile any inline clones. */ |
1611 | gcc_assert (!node->global.inlined_to); | |
1612 | ||
1613 | announce_function (decl); | |
1614 | node->process = 0; | |
1615 | gcc_assert (node->lowered); | |
1616 | ||
1617 | /* Generate RTL for the body of DECL. */ | |
1618 | ||
0878843f RG |
1619 | timevar_push (TV_REST_OF_COMPILATION); |
1620 | ||
1621 | gcc_assert (cgraph_global_info_ready); | |
1622 | ||
1623 | /* Initialize the default bitmap obstack. */ | |
1624 | bitmap_obstack_initialize (NULL); | |
1625 | ||
1626 | /* Initialize the RTL code for the function. */ | |
9c8305f8 | 1627 | current_function_decl = decl; |
0878843f | 1628 | saved_loc = input_location; |
9c8305f8 JH |
1629 | input_location = DECL_SOURCE_LOCATION (decl); |
1630 | init_function_start (decl); | |
0878843f RG |
1631 | |
1632 | gimple_register_cfg_hooks (); | |
1633 | ||
1634 | bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL generation*/ | |
1635 | ||
1636 | execute_all_ipa_transforms (); | |
1637 | ||
1638 | /* Perform all tree transforms and optimizations. */ | |
1639 | ||
1640 | /* Signal the start of passes. */ | |
1641 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_START, NULL); | |
1642 | ||
1643 | execute_pass_list (all_passes); | |
1644 | ||
1645 | /* Signal the end of passes. */ | |
1646 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_END, NULL); | |
1647 | ||
1648 | bitmap_obstack_release (®_obstack); | |
1649 | ||
1650 | /* Release the default bitmap obstack. */ | |
1651 | bitmap_obstack_release (NULL); | |
1652 | ||
0878843f RG |
1653 | /* If requested, warn about function definitions where the function will |
1654 | return a value (usually of some struct or union type) which itself will | |
1655 | take up a lot of stack space. */ | |
9c8305f8 | 1656 | if (warn_larger_than && !DECL_EXTERNAL (decl) && TREE_TYPE (decl)) |
0878843f | 1657 | { |
9c8305f8 | 1658 | tree ret_type = TREE_TYPE (TREE_TYPE (decl)); |
0878843f RG |
1659 | |
1660 | if (ret_type && TYPE_SIZE_UNIT (ret_type) | |
1661 | && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST | |
1662 | && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type), | |
1663 | larger_than_size)) | |
1664 | { | |
1665 | unsigned int size_as_int | |
1666 | = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type)); | |
1667 | ||
1668 | if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0) | |
1669 | warning (OPT_Wlarger_than_, "size of return value of %q+D is %u bytes", | |
9c8305f8 | 1670 | decl, size_as_int); |
0878843f RG |
1671 | else |
1672 | warning (OPT_Wlarger_than_, "size of return value of %q+D is larger than %wd bytes", | |
9c8305f8 | 1673 | decl, larger_than_size); |
0878843f RG |
1674 | } |
1675 | } | |
1676 | ||
9c8305f8 JH |
1677 | gimple_set_body (decl, NULL); |
1678 | if (DECL_STRUCT_FUNCTION (decl) == 0 | |
1679 | && !cgraph_get_node (decl)->origin) | |
0878843f RG |
1680 | { |
1681 | /* Stop pointing to the local nodes about to be freed. | |
1682 | But DECL_INITIAL must remain nonzero so we know this | |
1683 | was an actual function definition. | |
1684 | For a nested function, this is done in c_pop_function_context. | |
1685 | If rest_of_compilation set this to 0, leave it 0. */ | |
9c8305f8 JH |
1686 | if (DECL_INITIAL (decl) != 0) |
1687 | DECL_INITIAL (decl) = error_mark_node; | |
0878843f RG |
1688 | } |
1689 | ||
1690 | input_location = saved_loc; | |
1691 | ||
1692 | ggc_collect (); | |
1693 | timevar_pop (TV_REST_OF_COMPILATION); | |
5806d9ac JH |
1694 | |
1695 | /* Make sure that BE didn't give up on compiling. */ | |
1696 | gcc_assert (TREE_ASM_WRITTEN (decl)); | |
af16bc76 | 1697 | set_cfun (NULL); |
5806d9ac | 1698 | current_function_decl = NULL; |
1bb7e8f8 JH |
1699 | |
1700 | /* It would make a lot more sense to output thunks before function body to get more | |
65d630d4 | 1701 | forward and lest backwarding jumps. This however would need solving problem |
1bb7e8f8 | 1702 | with comdats. See PR48668. Also aliases must come after function itself to |
65d630d4 | 1703 | make one pass assemblers, like one on AIX, happy. See PR 50689. |
1bb7e8f8 JH |
1704 | FIXME: Perhaps thunks should be move before function IFF they are not in comdat |
1705 | groups. */ | |
1706 | assemble_thunks_and_aliases (node); | |
39ecc018 JH |
1707 | cgraph_release_function_body (node); |
1708 | /* Eliminate all call edges. This is important so the GIMPLE_CALL no longer | |
1709 | points to the dead function body. */ | |
1710 | cgraph_node_remove_callees (node); | |
1c4a429a JH |
1711 | } |
1712 | ||
6674a6ce | 1713 | |
db0e878d AJ |
1714 | /* Expand all functions that must be output. |
1715 | ||
b58b1157 JH |
1716 | Attempt to topologically sort the nodes so function is output when |
1717 | all called functions are already assembled to allow data to be | |
a98ebe2e | 1718 | propagated across the callgraph. Use a stack to get smaller distance |
d1a6adeb | 1719 | between a function and its callees (later we may choose to use a more |
b58b1157 JH |
1720 | sophisticated algorithm for function reordering; we will likely want |
1721 | to use subsections to make the output functions appear in top-down | |
1722 | order). */ | |
1723 | ||
1724 | static void | |
65d630d4 | 1725 | expand_all_functions (void) |
b58b1157 JH |
1726 | { |
1727 | struct cgraph_node *node; | |
5ed6ace5 | 1728 | struct cgraph_node **order = XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); |
f30cfcb1 | 1729 | int order_pos, new_order_pos = 0; |
b58b1157 JH |
1730 | int i; |
1731 | ||
af8bca3c | 1732 | order_pos = ipa_reverse_postorder (order); |
341c100f | 1733 | gcc_assert (order_pos == cgraph_n_nodes); |
b58b1157 | 1734 | |
1ae58c30 | 1735 | /* Garbage collector may remove inline clones we eliminate during |
18c6ada9 JH |
1736 | optimization. So we must be sure to not reference them. */ |
1737 | for (i = 0; i < order_pos; i++) | |
257eb6e3 | 1738 | if (order[i]->process) |
18c6ada9 JH |
1739 | order[new_order_pos++] = order[i]; |
1740 | ||
1741 | for (i = new_order_pos - 1; i >= 0; i--) | |
b58b1157 JH |
1742 | { |
1743 | node = order[i]; | |
257eb6e3 | 1744 | if (node->process) |
b58b1157 | 1745 | { |
257eb6e3 | 1746 | node->process = 0; |
65d630d4 | 1747 | expand_function (node); |
b58b1157 JH |
1748 | } |
1749 | } | |
f45e0ad1 | 1750 | cgraph_process_new_functions (); |
50674e96 | 1751 | |
b58b1157 | 1752 | free (order); |
50674e96 | 1753 | |
b58b1157 JH |
1754 | } |
1755 | ||
474eccc6 ILT |
1756 | /* This is used to sort the node types by the cgraph order number. */ |
1757 | ||
24b97832 ILT |
1758 | enum cgraph_order_sort_kind |
1759 | { | |
1760 | ORDER_UNDEFINED = 0, | |
1761 | ORDER_FUNCTION, | |
1762 | ORDER_VAR, | |
1763 | ORDER_ASM | |
1764 | }; | |
1765 | ||
474eccc6 ILT |
1766 | struct cgraph_order_sort |
1767 | { | |
24b97832 | 1768 | enum cgraph_order_sort_kind kind; |
474eccc6 ILT |
1769 | union |
1770 | { | |
1771 | struct cgraph_node *f; | |
8a4a83ed | 1772 | struct varpool_node *v; |
65d630d4 | 1773 | struct asm_node *a; |
474eccc6 ILT |
1774 | } u; |
1775 | }; | |
1776 | ||
1777 | /* Output all functions, variables, and asm statements in the order | |
1778 | according to their order fields, which is the order in which they | |
1779 | appeared in the file. This implements -fno-toplevel-reorder. In | |
1780 | this mode we may output functions and variables which don't really | |
1781 | need to be output. */ | |
1782 | ||
1783 | static void | |
65d630d4 | 1784 | output_in_order (void) |
474eccc6 ILT |
1785 | { |
1786 | int max; | |
474eccc6 ILT |
1787 | struct cgraph_order_sort *nodes; |
1788 | int i; | |
1789 | struct cgraph_node *pf; | |
8a4a83ed | 1790 | struct varpool_node *pv; |
65d630d4 | 1791 | struct asm_node *pa; |
474eccc6 | 1792 | |
2aae7680 | 1793 | max = symtab_order; |
33283dad | 1794 | nodes = XCNEWVEC (struct cgraph_order_sort, max); |
474eccc6 | 1795 | |
65c70e6b | 1796 | FOR_EACH_DEFINED_FUNCTION (pf) |
474eccc6 | 1797 | { |
39e2db00 | 1798 | if (pf->process && !pf->thunk.thunk_p && !pf->alias) |
474eccc6 | 1799 | { |
960bfb69 | 1800 | i = pf->symbol.order; |
474eccc6 ILT |
1801 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); |
1802 | nodes[i].kind = ORDER_FUNCTION; | |
1803 | nodes[i].u.f = pf; | |
1804 | } | |
1805 | } | |
1806 | ||
65c70e6b | 1807 | FOR_EACH_DEFINED_VARIABLE (pv) |
6649df51 JH |
1808 | if (!DECL_EXTERNAL (pv->symbol.decl)) |
1809 | { | |
1810 | i = pv->symbol.order; | |
1811 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1812 | nodes[i].kind = ORDER_VAR; | |
1813 | nodes[i].u.v = pv; | |
1814 | } | |
474eccc6 | 1815 | |
65d630d4 | 1816 | for (pa = asm_nodes; pa; pa = pa->next) |
474eccc6 ILT |
1817 | { |
1818 | i = pa->order; | |
1819 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
1820 | nodes[i].kind = ORDER_ASM; | |
1821 | nodes[i].u.a = pa; | |
1822 | } | |
474eccc6 | 1823 | |
7386e3ee | 1824 | /* In toplevel reorder mode we output all statics; mark them as needed. */ |
7386e3ee | 1825 | |
7fece979 JJ |
1826 | for (i = 0; i < max; ++i) |
1827 | if (nodes[i].kind == ORDER_VAR) | |
1828 | varpool_finalize_named_section_flags (nodes[i].u.v); | |
1829 | ||
474eccc6 ILT |
1830 | for (i = 0; i < max; ++i) |
1831 | { | |
1832 | switch (nodes[i].kind) | |
1833 | { | |
1834 | case ORDER_FUNCTION: | |
257eb6e3 | 1835 | nodes[i].u.f->process = 0; |
65d630d4 | 1836 | expand_function (nodes[i].u.f); |
474eccc6 ILT |
1837 | break; |
1838 | ||
1839 | case ORDER_VAR: | |
8a4a83ed | 1840 | varpool_assemble_decl (nodes[i].u.v); |
474eccc6 ILT |
1841 | break; |
1842 | ||
1843 | case ORDER_ASM: | |
1844 | assemble_asm (nodes[i].u.a->asm_str); | |
1845 | break; | |
1846 | ||
1847 | case ORDER_UNDEFINED: | |
1848 | break; | |
1849 | ||
1850 | default: | |
1851 | gcc_unreachable (); | |
1852 | } | |
1853 | } | |
e7b9eb2c | 1854 | |
65d630d4 | 1855 | asm_nodes = NULL; |
33283dad | 1856 | free (nodes); |
474eccc6 ILT |
1857 | } |
1858 | ||
ef330312 PB |
1859 | static void |
1860 | ipa_passes (void) | |
1861 | { | |
db2960f4 | 1862 | set_cfun (NULL); |
04b201a2 | 1863 | current_function_decl = NULL; |
726a989a | 1864 | gimple_register_cfg_hooks (); |
ef330312 | 1865 | bitmap_obstack_initialize (NULL); |
b20996ff | 1866 | |
090fa0ab GF |
1867 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_START, NULL); |
1868 | ||
b20996ff | 1869 | if (!in_lto_p) |
0430f80c RG |
1870 | { |
1871 | execute_ipa_pass_list (all_small_ipa_passes); | |
1872 | if (seen_error ()) | |
1873 | return; | |
1874 | } | |
3baf459d | 1875 | |
467a8db0 JH |
1876 | /* We never run removal of unreachable nodes after early passes. This is |
1877 | because TODO is run before the subpasses. It is important to remove | |
1878 | the unreachable functions to save works at IPA level and to get LTO | |
1879 | symbol tables right. */ | |
04142cc3 | 1880 | symtab_remove_unreachable_nodes (true, cgraph_dump_file); |
467a8db0 | 1881 | |
d7f09764 DN |
1882 | /* If pass_all_early_optimizations was not scheduled, the state of |
1883 | the cgraph will not be properly updated. Update it now. */ | |
1884 | if (cgraph_state < CGRAPH_STATE_IPA_SSA) | |
1885 | cgraph_state = CGRAPH_STATE_IPA_SSA; | |
3baf459d | 1886 | |
d7f09764 DN |
1887 | if (!in_lto_p) |
1888 | { | |
1889 | /* Generate coverage variables and constructors. */ | |
1890 | coverage_finish (); | |
1891 | ||
1892 | /* Process new functions added. */ | |
1893 | set_cfun (NULL); | |
1894 | current_function_decl = NULL; | |
1895 | cgraph_process_new_functions (); | |
d7f09764 | 1896 | |
090fa0ab GF |
1897 | execute_ipa_summary_passes |
1898 | ((struct ipa_opt_pass_d *) all_regular_ipa_passes); | |
fb3f88cc | 1899 | } |
c082f9f3 SB |
1900 | |
1901 | /* Some targets need to handle LTO assembler output specially. */ | |
1902 | if (flag_generate_lto) | |
1903 | targetm.asm_out.lto_start (); | |
1904 | ||
d7f09764 DN |
1905 | execute_ipa_summary_passes ((struct ipa_opt_pass_d *) all_lto_gen_passes); |
1906 | ||
1907 | if (!in_lto_p) | |
1908 | ipa_write_summaries (); | |
1909 | ||
c082f9f3 SB |
1910 | if (flag_generate_lto) |
1911 | targetm.asm_out.lto_end (); | |
1912 | ||
cc8547a7 | 1913 | if (!flag_ltrans && (in_lto_p || !flag_lto || flag_fat_lto_objects)) |
fb3f88cc | 1914 | execute_ipa_pass_list (all_regular_ipa_passes); |
090fa0ab | 1915 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_END, NULL); |
3baf459d | 1916 | |
ef330312 PB |
1917 | bitmap_obstack_release (NULL); |
1918 | } | |
1919 | ||
25e2c40d JH |
1920 | |
1921 | /* Return string alias is alias of. */ | |
1922 | ||
1923 | static tree | |
1924 | get_alias_symbol (tree decl) | |
1925 | { | |
1926 | tree alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); | |
1927 | return get_identifier (TREE_STRING_POINTER | |
1928 | (TREE_VALUE (TREE_VALUE (alias)))); | |
1929 | } | |
1930 | ||
1931 | ||
c9552bff | 1932 | /* Weakrefs may be associated to external decls and thus not output |
073a8998 | 1933 | at expansion time. Emit all necessary aliases. */ |
c9552bff | 1934 | |
a66f86bb | 1935 | static void |
c9552bff JH |
1936 | output_weakrefs (void) |
1937 | { | |
1938 | struct cgraph_node *node; | |
1939 | struct varpool_node *vnode; | |
65c70e6b | 1940 | FOR_EACH_FUNCTION (node) |
960bfb69 JH |
1941 | if (node->alias && DECL_EXTERNAL (node->symbol.decl) |
1942 | && !TREE_ASM_WRITTEN (node->symbol.decl) | |
1943 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (node->symbol.decl))) | |
07250f0e JH |
1944 | do_assemble_alias (node->symbol.decl, |
1945 | node->thunk.alias ? DECL_ASSEMBLER_NAME (node->thunk.alias) | |
1946 | : get_alias_symbol (node->symbol.decl)); | |
65c70e6b | 1947 | FOR_EACH_VARIABLE (vnode) |
960bfb69 JH |
1948 | if (vnode->alias && DECL_EXTERNAL (vnode->symbol.decl) |
1949 | && !TREE_ASM_WRITTEN (vnode->symbol.decl) | |
1950 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (vnode->symbol.decl))) | |
07250f0e JH |
1951 | do_assemble_alias (vnode->symbol.decl, |
1952 | vnode->alias_of ? DECL_ASSEMBLER_NAME (vnode->alias_of) | |
1953 | : get_alias_symbol (vnode->symbol.decl)); | |
c9552bff JH |
1954 | } |
1955 | ||
9c8305f8 | 1956 | /* Initialize callgraph dump file. */ |
4537ec0c | 1957 | |
9b3e897d PB |
1958 | void |
1959 | init_cgraph (void) | |
1960 | { | |
a05541a9 JH |
1961 | if (!cgraph_dump_file) |
1962 | cgraph_dump_file = dump_begin (TDI_cgraph, NULL); | |
9b3e897d | 1963 | } |
57fb5341 | 1964 | |
711417cd RG |
1965 | |
1966 | /* Perform simple optimizations based on callgraph. */ | |
1967 | ||
1968 | void | |
65d630d4 | 1969 | compile (void) |
711417cd RG |
1970 | { |
1971 | if (seen_error ()) | |
1972 | return; | |
1973 | ||
1974 | #ifdef ENABLE_CHECKING | |
474ffc72 | 1975 | verify_symtab (); |
711417cd RG |
1976 | #endif |
1977 | ||
711417cd RG |
1978 | timevar_push (TV_CGRAPHOPT); |
1979 | if (pre_ipa_mem_report) | |
1980 | { | |
1981 | fprintf (stderr, "Memory consumption before IPA\n"); | |
1982 | dump_memory_report (false); | |
1983 | } | |
1984 | if (!quiet_flag) | |
1985 | fprintf (stderr, "Performing interprocedural optimizations\n"); | |
1986 | cgraph_state = CGRAPH_STATE_IPA; | |
1987 | ||
65d630d4 JH |
1988 | /* If LTO is enabled, initialize the streamer hooks needed by GIMPLE. */ |
1989 | if (flag_lto) | |
1990 | lto_streamer_hooks_init (); | |
1991 | ||
711417cd RG |
1992 | /* Don't run the IPA passes if there was any error or sorry messages. */ |
1993 | if (!seen_error ()) | |
1994 | ipa_passes (); | |
1995 | ||
1996 | /* Do nothing else if any IPA pass found errors or if we are just streaming LTO. */ | |
1997 | if (seen_error () | |
1998 | || (!in_lto_p && flag_lto && !flag_fat_lto_objects)) | |
1999 | { | |
2000 | timevar_pop (TV_CGRAPHOPT); | |
2001 | return; | |
2002 | } | |
2003 | ||
2004 | /* This pass remove bodies of extern inline functions we never inlined. | |
2005 | Do this later so other IPA passes see what is really going on. */ | |
04142cc3 | 2006 | symtab_remove_unreachable_nodes (false, dump_file); |
711417cd RG |
2007 | cgraph_global_info_ready = true; |
2008 | if (cgraph_dump_file) | |
2009 | { | |
2010 | fprintf (cgraph_dump_file, "Optimized "); | |
8f940ee6 | 2011 | dump_symtab (cgraph_dump_file); |
711417cd RG |
2012 | } |
2013 | if (post_ipa_mem_report) | |
2014 | { | |
2015 | fprintf (stderr, "Memory consumption after IPA\n"); | |
2016 | dump_memory_report (false); | |
2017 | } | |
2018 | timevar_pop (TV_CGRAPHOPT); | |
2019 | ||
2020 | /* Output everything. */ | |
2021 | (*debug_hooks->assembly_start) (); | |
2022 | if (!quiet_flag) | |
2023 | fprintf (stderr, "Assembling functions:\n"); | |
2024 | #ifdef ENABLE_CHECKING | |
474ffc72 | 2025 | verify_symtab (); |
711417cd RG |
2026 | #endif |
2027 | ||
2028 | cgraph_materialize_all_clones (); | |
2029 | bitmap_obstack_initialize (NULL); | |
2030 | execute_ipa_pass_list (all_late_ipa_passes); | |
04142cc3 | 2031 | symtab_remove_unreachable_nodes (true, dump_file); |
711417cd | 2032 | #ifdef ENABLE_CHECKING |
474ffc72 | 2033 | verify_symtab (); |
711417cd RG |
2034 | #endif |
2035 | bitmap_obstack_release (NULL); | |
65d630d4 | 2036 | mark_functions_to_output (); |
711417cd RG |
2037 | |
2038 | cgraph_state = CGRAPH_STATE_EXPANSION; | |
2039 | if (!flag_toplevel_reorder) | |
65d630d4 | 2040 | output_in_order (); |
711417cd RG |
2041 | else |
2042 | { | |
65d630d4 | 2043 | output_asm_statements (); |
711417cd | 2044 | |
65d630d4 JH |
2045 | expand_all_functions (); |
2046 | varpool_output_variables (); | |
711417cd RG |
2047 | } |
2048 | ||
2049 | cgraph_process_new_functions (); | |
2050 | cgraph_state = CGRAPH_STATE_FINISHED; | |
07250f0e | 2051 | output_weakrefs (); |
711417cd RG |
2052 | |
2053 | if (cgraph_dump_file) | |
2054 | { | |
2055 | fprintf (cgraph_dump_file, "\nFinal "); | |
8f940ee6 | 2056 | dump_symtab (cgraph_dump_file); |
711417cd RG |
2057 | } |
2058 | #ifdef ENABLE_CHECKING | |
474ffc72 | 2059 | verify_symtab (); |
711417cd RG |
2060 | /* Double check that all inline clones are gone and that all |
2061 | function bodies have been released from memory. */ | |
2062 | if (!seen_error ()) | |
2063 | { | |
2064 | struct cgraph_node *node; | |
2065 | bool error_found = false; | |
2066 | ||
65c70e6b JH |
2067 | FOR_EACH_DEFINED_FUNCTION (node) |
2068 | if (node->global.inlined_to | |
2069 | || gimple_has_body_p (node->symbol.decl)) | |
711417cd RG |
2070 | { |
2071 | error_found = true; | |
2072 | dump_cgraph_node (stderr, node); | |
2073 | } | |
2074 | if (error_found) | |
2075 | internal_error ("nodes with unreleased memory found"); | |
2076 | } | |
2077 | #endif | |
2078 | } | |
2079 | ||
2080 | ||
2081 | /* Analyze the whole compilation unit once it is parsed completely. */ | |
2082 | ||
2083 | void | |
65d630d4 | 2084 | finalize_compilation_unit (void) |
711417cd RG |
2085 | { |
2086 | timevar_push (TV_CGRAPH); | |
2087 | ||
711417cd RG |
2088 | /* If we're here there's no current function anymore. Some frontends |
2089 | are lazy in clearing these. */ | |
2090 | current_function_decl = NULL; | |
2091 | set_cfun (NULL); | |
2092 | ||
2093 | /* Do not skip analyzing the functions if there were errors, we | |
2094 | miss diagnostics for following functions otherwise. */ | |
2095 | ||
2096 | /* Emit size functions we didn't inline. */ | |
2097 | finalize_size_functions (); | |
2098 | ||
2099 | /* Mark alias targets necessary and emit diagnostics. */ | |
711417cd RG |
2100 | handle_alias_pairs (); |
2101 | ||
2102 | if (!quiet_flag) | |
2103 | { | |
2104 | fprintf (stderr, "\nAnalyzing compilation unit\n"); | |
2105 | fflush (stderr); | |
2106 | } | |
2107 | ||
2108 | if (flag_dump_passes) | |
2109 | dump_passes (); | |
2110 | ||
2111 | /* Gimplify and lower all functions, compute reachability and | |
2112 | remove unreachable nodes. */ | |
2113 | cgraph_analyze_functions (); | |
2114 | ||
2115 | /* Mark alias targets necessary and emit diagnostics. */ | |
711417cd RG |
2116 | handle_alias_pairs (); |
2117 | ||
2118 | /* Gimplify and lower thunks. */ | |
2119 | cgraph_analyze_functions (); | |
2120 | ||
2121 | /* Finally drive the pass manager. */ | |
65d630d4 | 2122 | compile (); |
711417cd RG |
2123 | |
2124 | timevar_pop (TV_CGRAPH); | |
2125 | } | |
2126 | ||
2127 | ||
7be82279 | 2128 | #include "gt-cgraphunit.h" |