]>
Commit | Line | Data |
---|---|---|
9c8305f8 | 1 | /* Driver of optimization process |
a5544970 | 2 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
1c4a429a JH |
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 | |
9dcd6f09 | 9 | Software Foundation; either version 3, or (at your option) any later |
1c4a429a JH |
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 | |
9dcd6f09 NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
1c4a429a | 20 | |
9c8305f8 | 21 | /* This module implements main driver of compilation process. |
18c6ada9 JH |
22 | |
23 | The main scope of this file is to act as an interface in between | |
9c8305f8 | 24 | tree based frontends and the backend. |
18c6ada9 JH |
25 | |
26 | The front-end is supposed to use following functionality: | |
27 | ||
3dafb85c | 28 | - finalize_function |
18c6ada9 JH |
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 | ||
efe75b6f JH |
33 | (There is one exception needed for implementing GCC extern inline |
34 | function.) | |
18c6ada9 | 35 | |
047ae098 | 36 | - varpool_finalize_decl |
18c6ada9 | 37 | |
1ae58c30 | 38 | This function has same behavior as the above but is used for static |
18c6ada9 JH |
39 | variables. |
40 | ||
65d630d4 JH |
41 | - add_asm_node |
42 | ||
43 | Insert new toplevel ASM statement | |
44 | ||
45 | - finalize_compilation_unit | |
18c6ada9 | 46 | |
efe75b6f JH |
47 | This function is called once (source level) compilation unit is finalized |
48 | and it will no longer change. | |
18c6ada9 | 49 | |
9c8305f8 JH |
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. | |
073a8998 | 53 | Those are used to discover other necessary functions and variables. |
9c8305f8 JH |
54 | |
55 | At the end the bodies of unreachable functions are removed. | |
18c6ada9 | 56 | |
efe75b6f | 57 | The function can be called multiple times when multiple source level |
9c8305f8 | 58 | compilation units are combined. |
18c6ada9 | 59 | |
65d630d4 | 60 | - compile |
18c6ada9 | 61 | |
9c8305f8 JH |
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 | |
688010ba | 86 | time. These include, for example, transational memory lowering, |
9c8305f8 JH |
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 | ||
f0355446 | 98 | d) LTO streaming. When doing LTO, everything important gets |
9c8305f8 JH |
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. | |
18c6ada9 | 111 | |
9c8305f8 | 112 | Compile time and/or parallel linktime stage (ltrans) |
18c6ada9 | 113 | |
9c8305f8 JH |
114 | Each of the object files is streamed back and compiled |
115 | separately. Now the function bodies becomes available | |
116 | again. | |
18c6ada9 | 117 | |
9c8305f8 JH |
118 | 2) Virtual clone materialization |
119 | (cgraph_materialize_clone) | |
18c6ada9 | 120 | |
9c8305f8 JH |
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 | |
18c6ada9 | 127 | |
9c8305f8 JH |
128 | All IP passes transform function bodies based on earlier |
129 | decision of the IP propagation. | |
18c6ada9 | 130 | |
9c8305f8 | 131 | 4) late small IP passes |
18c6ada9 | 132 | |
9c8305f8 | 133 | Simple IP passes working within single program partition. |
18c6ada9 | 134 | |
9c8305f8 | 135 | 5) Expansion |
65d630d4 | 136 | (expand_all_functions) |
18c6ada9 | 137 | |
9c8305f8 JH |
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. | |
18c6ada9 | 143 | |
9c8305f8 JH |
144 | Note that with -fno-toplevel-reorder passes 5 and 6 |
145 | are combined together in cgraph_output_in_order. | |
18c6ada9 | 146 | |
9c8305f8 JH |
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. | |
9b3e897d | 153 | |
9c8305f8 JH |
154 | - cgraph_function_versioning |
155 | ||
156 | produces a copy of function into new one (a version) | |
157 | and apply simple transformations | |
158 | */ | |
6674a6ce | 159 | |
1c4a429a JH |
160 | #include "config.h" |
161 | #include "system.h" | |
162 | #include "coretypes.h" | |
c7131fb2 | 163 | #include "backend.h" |
957060b5 AM |
164 | #include "target.h" |
165 | #include "rtl.h" | |
1c4a429a | 166 | #include "tree.h" |
c7131fb2 | 167 | #include "gimple.h" |
957060b5 AM |
168 | #include "cfghooks.h" |
169 | #include "regset.h" /* FIXME: For reg_obstack. */ | |
170 | #include "alloc-pool.h" | |
171 | #include "tree-pass.h" | |
172 | #include "stringpool.h" | |
173 | #include "gimple-ssa.h" | |
174 | #include "cgraph.h" | |
175 | #include "coverage.h" | |
176 | #include "lto-streamer.h" | |
40e23961 | 177 | #include "fold-const.h" |
d8a2d370 DN |
178 | #include "varasm.h" |
179 | #include "stor-layout.h" | |
0878843f | 180 | #include "output.h" |
e677a9d4 | 181 | #include "cfgcleanup.h" |
2fb9a547 | 182 | #include "gimple-fold.h" |
45b0be94 | 183 | #include "gimplify.h" |
5be5c238 | 184 | #include "gimple-iterator.h" |
18f429e2 | 185 | #include "gimplify-me.h" |
442b4905 AM |
186 | #include "tree-cfg.h" |
187 | #include "tree-into-ssa.h" | |
7a300452 | 188 | #include "tree-ssa.h" |
1c4a429a | 189 | #include "langhooks.h" |
1c4a429a | 190 | #include "toplev.h" |
1c4a429a | 191 | #include "debug.h" |
dd912cb8 | 192 | #include "symbol-summary.h" |
8bc5448f | 193 | #include "tree-vrp.h" |
57fb5341 | 194 | #include "ipa-prop.h" |
9c8305f8 | 195 | #include "gimple-pretty-print.h" |
090fa0ab | 196 | #include "plugin.h" |
27d020cf | 197 | #include "ipa-fnsummary.h" |
af8bca3c | 198 | #include "ipa-utils.h" |
452aa9c5 | 199 | #include "except.h" |
31ee20ba | 200 | #include "cfgloop.h" |
315f8c0e DM |
201 | #include "context.h" |
202 | #include "pass_manager.h" | |
1fe37220 | 203 | #include "tree-nested.h" |
2b5f0895 | 204 | #include "dbgcnt.h" |
1f6be682 | 205 | #include "lto-section-names.h" |
314e6352 ML |
206 | #include "stringpool.h" |
207 | #include "attribs.h" | |
b58b1157 | 208 | |
66058468 JH |
209 | /* Queue of cgraph nodes scheduled to be added into cgraph. This is a |
210 | secondary queue used during optimization to accommodate passes that | |
211 | may generate new functions that need to be optimized and expanded. */ | |
31acf1bb | 212 | vec<cgraph_node *> cgraph_new_nodes; |
66058468 | 213 | |
65d630d4 JH |
214 | static void expand_all_functions (void); |
215 | static void mark_functions_to_output (void); | |
877ab5e9 | 216 | static void handle_alias_pairs (void); |
7dff32e6 | 217 | |
6744a6ab JH |
218 | /* Used for vtable lookup in thunk adjusting. */ |
219 | static GTY (()) tree vtable_entry_type; | |
220 | ||
c2e84327 DM |
221 | /* Return true if this symbol is a function from the C frontend specified |
222 | directly in RTL form (with "__RTL"). */ | |
223 | ||
224 | bool | |
225 | symtab_node::native_rtl_p () const | |
226 | { | |
227 | if (TREE_CODE (decl) != FUNCTION_DECL) | |
228 | return false; | |
229 | if (!DECL_STRUCT_FUNCTION (decl)) | |
230 | return false; | |
231 | return DECL_STRUCT_FUNCTION (decl)->curr_properties & PROP_rtl; | |
232 | } | |
233 | ||
3dafb85c | 234 | /* Determine if symbol declaration is needed. That is, visible to something |
edb983b2 JH |
235 | either outside this translation unit, something magic in the system |
236 | configury */ | |
237 | bool | |
3dafb85c | 238 | symtab_node::needed_p (void) |
8dafba3c | 239 | { |
ead84f73 JH |
240 | /* Double check that no one output the function into assembly file |
241 | early. */ | |
c2e84327 DM |
242 | if (!native_rtl_p ()) |
243 | gcc_checking_assert | |
244 | (!DECL_ASSEMBLER_NAME_SET_P (decl) | |
245 | || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))); | |
e7d6beb0 | 246 | |
3dafb85c | 247 | if (!definition) |
edb983b2 | 248 | return false; |
a1d31187 | 249 | |
edb983b2 JH |
250 | if (DECL_EXTERNAL (decl)) |
251 | return false; | |
04f77d0f | 252 | |
edb983b2 | 253 | /* If the user told us it is used, then it must be so. */ |
3dafb85c | 254 | if (force_output) |
edb983b2 JH |
255 | return true; |
256 | ||
257 | /* ABI forced symbols are needed when they are external. */ | |
3dafb85c | 258 | if (forced_by_abi && TREE_PUBLIC (decl)) |
edb983b2 JH |
259 | return true; |
260 | ||
1bf7c324 | 261 | /* Keep constructors, destructors and virtual functions. */ |
edb983b2 JH |
262 | if (TREE_CODE (decl) == FUNCTION_DECL |
263 | && (DECL_STATIC_CONSTRUCTOR (decl) || DECL_STATIC_DESTRUCTOR (decl))) | |
264 | return true; | |
265 | ||
266 | /* Externally visible variables must be output. The exception is | |
267 | COMDAT variables that must be output only when they are needed. */ | |
268 | if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) | |
8dafba3c RH |
269 | return true; |
270 | ||
8dafba3c RH |
271 | return false; |
272 | } | |
273 | ||
b4d05578 BS |
274 | /* Head and terminator of the queue of nodes to be processed while building |
275 | callgraph. */ | |
66058468 | 276 | |
b4d05578 BS |
277 | static symtab_node symtab_terminator; |
278 | static symtab_node *queued_nodes = &symtab_terminator; | |
66058468 | 279 | |
b4d05578 | 280 | /* Add NODE to queue starting at QUEUED_NODES. |
66058468 JH |
281 | The queue is linked via AUX pointers and terminated by pointer to 1. */ |
282 | ||
283 | static void | |
5e20cdc9 | 284 | enqueue_node (symtab_node *node) |
66058468 | 285 | { |
67348ccc | 286 | if (node->aux) |
66058468 | 287 | return; |
b4d05578 BS |
288 | gcc_checking_assert (queued_nodes); |
289 | node->aux = queued_nodes; | |
290 | queued_nodes = node; | |
66058468 JH |
291 | } |
292 | ||
d60ab196 | 293 | /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these |
f45e0ad1 JH |
294 | functions into callgraph in a way so they look like ordinary reachable |
295 | functions inserted into callgraph already at construction time. */ | |
296 | ||
b4d05578 | 297 | void |
3dafb85c | 298 | symbol_table::process_new_functions (void) |
f45e0ad1 | 299 | { |
f45e0ad1 | 300 | tree fndecl; |
f45e0ad1 | 301 | |
31acf1bb | 302 | if (!cgraph_new_nodes.exists ()) |
b4d05578 | 303 | return; |
31acf1bb | 304 | |
877ab5e9 | 305 | handle_alias_pairs (); |
f45e0ad1 JH |
306 | /* Note that this queue may grow as its being processed, as the new |
307 | functions may generate new ones. */ | |
31acf1bb | 308 | for (unsigned i = 0; i < cgraph_new_nodes.length (); i++) |
f45e0ad1 | 309 | { |
31acf1bb | 310 | cgraph_node *node = cgraph_new_nodes[i]; |
67348ccc | 311 | fndecl = node->decl; |
3dafb85c | 312 | switch (state) |
f45e0ad1 | 313 | { |
3dafb85c | 314 | case CONSTRUCTION: |
f45e0ad1 JH |
315 | /* At construction time we just need to finalize function and move |
316 | it into reachable functions list. */ | |
317 | ||
3dafb85c ML |
318 | cgraph_node::finalize_function (fndecl, false); |
319 | call_cgraph_insertion_hooks (node); | |
67348ccc | 320 | enqueue_node (node); |
f45e0ad1 JH |
321 | break; |
322 | ||
3dafb85c ML |
323 | case IPA: |
324 | case IPA_SSA: | |
17e0fc92 | 325 | case IPA_SSA_AFTER_INLINING: |
f45e0ad1 JH |
326 | /* When IPA optimization already started, do all essential |
327 | transformations that has been already performed on the whole | |
328 | cgraph but not on this function. */ | |
329 | ||
726a989a | 330 | gimple_register_cfg_hooks (); |
67348ccc | 331 | if (!node->analyzed) |
d52f5295 | 332 | node->analyze (); |
f45e0ad1 | 333 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); |
17e0fc92 | 334 | if ((state == IPA_SSA || state == IPA_SSA_AFTER_INLINING) |
7a388ee4 | 335 | && !gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) |
0bceb671 JH |
336 | { |
337 | bool summaried_computed = ipa_fn_summaries != NULL; | |
338 | g->get_passes ()->execute_early_local_passes (); | |
339 | /* Early passes compure inline parameters to do inlining | |
340 | and splitting. This is redundant for functions added late. | |
341 | Just throw away whatever it did. */ | |
342 | if (!summaried_computed) | |
f658ad30 JH |
343 | { |
344 | ipa_free_fn_summary (); | |
345 | ipa_free_size_summary (); | |
346 | } | |
0bceb671 JH |
347 | } |
348 | else if (ipa_fn_summaries != NULL) | |
349 | compute_fn_summary (node, true); | |
f45e0ad1 JH |
350 | free_dominance_info (CDI_POST_DOMINATORS); |
351 | free_dominance_info (CDI_DOMINATORS); | |
352 | pop_cfun (); | |
82afdc6f | 353 | call_cgraph_insertion_hooks (node); |
f45e0ad1 JH |
354 | break; |
355 | ||
3dafb85c | 356 | case EXPANSION: |
f45e0ad1 JH |
357 | /* Functions created during expansion shall be compiled |
358 | directly. */ | |
257eb6e3 | 359 | node->process = 0; |
3dafb85c ML |
360 | call_cgraph_insertion_hooks (node); |
361 | node->expand (); | |
f45e0ad1 JH |
362 | break; |
363 | ||
364 | default: | |
365 | gcc_unreachable (); | |
366 | break; | |
367 | } | |
368 | } | |
31acf1bb ML |
369 | |
370 | cgraph_new_nodes.release (); | |
f45e0ad1 JH |
371 | } |
372 | ||
d71cc23f JH |
373 | /* As an GCC extension we allow redefinition of the function. The |
374 | semantics when both copies of bodies differ is not well defined. | |
375 | We replace the old body with new body so in unit at a time mode | |
376 | we always use new body, while in normal mode we may end up with | |
377 | old body inlined into some functions and new body expanded and | |
378 | inlined in others. | |
379 | ||
380 | ??? It may make more sense to use one body for inlining and other | |
381 | body for expanding the function but this is difficult to do. */ | |
382 | ||
e70670cf | 383 | void |
d52f5295 | 384 | cgraph_node::reset (void) |
d71cc23f | 385 | { |
d52f5295 | 386 | /* If process is set, then we have already begun whole-unit analysis. |
7e8b322a JH |
387 | This is *not* testing for whether we've already emitted the function. |
388 | That case can be sort-of legitimately seen with real function redefinition | |
389 | errors. I would argue that the front end should never present us with | |
390 | such a case, but don't enforce that for now. */ | |
d52f5295 | 391 | gcc_assert (!process); |
d71cc23f JH |
392 | |
393 | /* Reset our data structures so we can analyze the function again. */ | |
d52f5295 ML |
394 | memset (&local, 0, sizeof (local)); |
395 | memset (&global, 0, sizeof (global)); | |
396 | memset (&rtl, 0, sizeof (rtl)); | |
397 | analyzed = false; | |
398 | definition = false; | |
399 | alias = false; | |
71e54687 | 400 | transparent_alias = false; |
d52f5295 ML |
401 | weakref = false; |
402 | cpp_implicit_alias = false; | |
403 | ||
404 | remove_callees (); | |
405 | remove_all_references (); | |
d71cc23f | 406 | } |
d853a20e | 407 | |
d7438551 AH |
408 | /* Return true when there are references to the node. INCLUDE_SELF is |
409 | true if a self reference counts as a reference. */ | |
838ff415 | 410 | |
3dafb85c | 411 | bool |
d7438551 | 412 | symtab_node::referred_to_p (bool include_self) |
838ff415 | 413 | { |
3dafb85c | 414 | ipa_ref *ref = NULL; |
838ff415 | 415 | |
073a8998 | 416 | /* See if there are any references at all. */ |
3dafb85c | 417 | if (iterate_referring (0, ref)) |
838ff415 | 418 | return true; |
65d630d4 | 419 | /* For functions check also calls. */ |
3dafb85c | 420 | cgraph_node *cn = dyn_cast <cgraph_node *> (this); |
5d59b5e1 | 421 | if (cn && cn->callers) |
d7438551 AH |
422 | { |
423 | if (include_self) | |
424 | return true; | |
425 | for (cgraph_edge *e = cn->callers; e; e = e->next_caller) | |
426 | if (e->caller != this) | |
427 | return true; | |
428 | } | |
838ff415 JH |
429 | return false; |
430 | } | |
431 | ||
6b00c969 | 432 | /* DECL has been parsed. Take it, queue it, compile it at the whim of the |
15682f24 | 433 | logic in effect. If NO_COLLECT is true, then our caller cannot stand to have |
6b00c969 RH |
434 | the garbage collector run at the moment. We would need to either create |
435 | a new GC context, or just not compile right now. */ | |
1c4a429a JH |
436 | |
437 | void | |
3dafb85c | 438 | cgraph_node::finalize_function (tree decl, bool no_collect) |
1c4a429a | 439 | { |
3dafb85c | 440 | cgraph_node *node = cgraph_node::get_create (decl); |
1c4a429a | 441 | |
67348ccc | 442 | if (node->definition) |
b125ad45 | 443 | { |
15682f24 MJ |
444 | /* Nested functions should only be defined once. */ |
445 | gcc_assert (!DECL_CONTEXT (decl) | |
446 | || TREE_CODE (DECL_CONTEXT (decl)) != FUNCTION_DECL); | |
d52f5295 | 447 | node->reset (); |
b125ad45 JH |
448 | node->local.redefined_extern_inline = true; |
449 | } | |
6b00c969 | 450 | |
6a1e352e L |
451 | /* Set definition first before calling notice_global_symbol so that |
452 | it is available to notice_global_symbol. */ | |
67348ccc | 453 | node->definition = true; |
6a1e352e | 454 | notice_global_symbol (decl); |
e21aff8a | 455 | node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL; |
0eaf0bfe JH |
456 | if (!flag_toplevel_reorder) |
457 | node->no_reorder = true; | |
1c4a429a | 458 | |
ead84f73 JH |
459 | /* With -fkeep-inline-functions we are keeping all inline functions except |
460 | for extern inline ones. */ | |
461 | if (flag_keep_inline_functions | |
462 | && DECL_DECLARED_INLINE_P (decl) | |
463 | && !DECL_EXTERNAL (decl) | |
464 | && !DECL_DISREGARD_INLINE_LIMITS (decl)) | |
67348ccc | 465 | node->force_output = 1; |
8dafba3c | 466 | |
c2e84327 DM |
467 | /* __RTL functions were already output as soon as they were parsed (due |
468 | to the large amount of global state in the backend). | |
469 | Mark such functions as "force_output" to reflect the fact that they | |
470 | will be in the asm file when considering the symbols they reference. | |
471 | The attempt to output them later on will bail out immediately. */ | |
472 | if (node->native_rtl_p ()) | |
473 | node->force_output = 1; | |
474 | ||
ead84f73 JH |
475 | /* When not optimizing, also output the static functions. (see |
476 | PR24561), but don't do so for always_inline functions, functions | |
477 | declared inline and nested functions. These were optimized out | |
478 | in the original implementation and it is unclear whether we want | |
479 | to change the behavior here. */ | |
0eaf0bfe JH |
480 | if (((!opt_for_fn (decl, optimize) || flag_keep_static_functions |
481 | || node->no_reorder) | |
67348ccc | 482 | && !node->cpp_implicit_alias |
ead84f73 JH |
483 | && !DECL_DISREGARD_INLINE_LIMITS (decl) |
484 | && !DECL_DECLARED_INLINE_P (decl) | |
485 | && !(DECL_CONTEXT (decl) | |
486 | && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)) | |
487 | && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl)) | |
67348ccc | 488 | node->force_output = 1; |
ead84f73 | 489 | |
8dafba3c | 490 | /* If we've not yet emitted decl, tell the debug info about it. */ |
6b00c969 | 491 | if (!TREE_ASM_WRITTEN (decl)) |
8dafba3c | 492 | (*debug_hooks->deferred_inline_function) (decl); |
d173e685 | 493 | |
15682f24 | 494 | if (!no_collect) |
7e8b322a | 495 | ggc_collect (); |
838ff415 | 496 | |
3dafb85c ML |
497 | if (symtab->state == CONSTRUCTION |
498 | && (node->needed_p () || node->referred_to_p ())) | |
67348ccc | 499 | enqueue_node (node); |
1c4a429a JH |
500 | } |
501 | ||
452aa9c5 | 502 | /* Add the function FNDECL to the call graph. |
3dafb85c | 503 | Unlike finalize_function, this function is intended to be used |
452aa9c5 RG |
504 | by middle end and allows insertion of new function at arbitrary point |
505 | of compilation. The function can be either in high, low or SSA form | |
506 | GIMPLE. | |
507 | ||
508 | The function is assumed to be reachable and have address taken (so no | |
509 | API breaking optimizations are performed on it). | |
510 | ||
511 | Main work done by this function is to enqueue the function for later | |
512 | processing to avoid need the passes to be re-entrant. */ | |
513 | ||
514 | void | |
d52f5295 | 515 | cgraph_node::add_new_function (tree fndecl, bool lowered) |
452aa9c5 | 516 | { |
315f8c0e | 517 | gcc::pass_manager *passes = g->get_passes (); |
3dafb85c | 518 | cgraph_node *node; |
9452ef06 TV |
519 | |
520 | if (dump_file) | |
521 | { | |
522 | struct function *fn = DECL_STRUCT_FUNCTION (fndecl); | |
523 | const char *function_type = ((gimple_has_body_p (fndecl)) | |
524 | ? (lowered | |
525 | ? (gimple_in_ssa_p (fn) | |
526 | ? "ssa gimple" | |
527 | : "low gimple") | |
528 | : "high gimple") | |
529 | : "to-be-gimplified"); | |
530 | fprintf (dump_file, | |
531 | "Added new %s function %s to callgraph\n", | |
532 | function_type, | |
533 | fndecl_name (fndecl)); | |
534 | } | |
535 | ||
3dafb85c | 536 | switch (symtab->state) |
452aa9c5 | 537 | { |
3dafb85c ML |
538 | case PARSING: |
539 | cgraph_node::finalize_function (fndecl, false); | |
66058468 | 540 | break; |
3dafb85c | 541 | case CONSTRUCTION: |
452aa9c5 | 542 | /* Just enqueue function to be processed at nearest occurrence. */ |
d52f5295 | 543 | node = cgraph_node::get_create (fndecl); |
452aa9c5 RG |
544 | if (lowered) |
545 | node->lowered = true; | |
31acf1bb | 546 | cgraph_new_nodes.safe_push (node); |
452aa9c5 RG |
547 | break; |
548 | ||
3dafb85c ML |
549 | case IPA: |
550 | case IPA_SSA: | |
17e0fc92 | 551 | case IPA_SSA_AFTER_INLINING: |
3dafb85c | 552 | case EXPANSION: |
452aa9c5 RG |
553 | /* Bring the function into finalized state and enqueue for later |
554 | analyzing and compilation. */ | |
d52f5295 | 555 | node = cgraph_node::get_create (fndecl); |
452aa9c5 | 556 | node->local.local = false; |
67348ccc DM |
557 | node->definition = true; |
558 | node->force_output = true; | |
388dde26 JH |
559 | if (TREE_PUBLIC (fndecl)) |
560 | node->externally_visible = true; | |
3dafb85c | 561 | if (!lowered && symtab->state == EXPANSION) |
452aa9c5 RG |
562 | { |
563 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); | |
452aa9c5 RG |
564 | gimple_register_cfg_hooks (); |
565 | bitmap_obstack_initialize (NULL); | |
2cbf2d95 | 566 | execute_pass_list (cfun, passes->all_lowering_passes); |
f7695dbf | 567 | passes->execute_early_local_passes (); |
452aa9c5 RG |
568 | bitmap_obstack_release (NULL); |
569 | pop_cfun (); | |
452aa9c5 RG |
570 | |
571 | lowered = true; | |
572 | } | |
573 | if (lowered) | |
574 | node->lowered = true; | |
31acf1bb | 575 | cgraph_new_nodes.safe_push (node); |
452aa9c5 RG |
576 | break; |
577 | ||
3dafb85c | 578 | case FINISHED: |
452aa9c5 RG |
579 | /* At the very end of compilation we have to do all the work up |
580 | to expansion. */ | |
d52f5295 | 581 | node = cgraph_node::create (fndecl); |
452aa9c5 RG |
582 | if (lowered) |
583 | node->lowered = true; | |
67348ccc | 584 | node->definition = true; |
d52f5295 | 585 | node->analyze (); |
452aa9c5 | 586 | push_cfun (DECL_STRUCT_FUNCTION (fndecl)); |
452aa9c5 RG |
587 | gimple_register_cfg_hooks (); |
588 | bitmap_obstack_initialize (NULL); | |
589 | if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl))) | |
f7695dbf | 590 | g->get_passes ()->execute_early_local_passes (); |
452aa9c5 | 591 | bitmap_obstack_release (NULL); |
452aa9c5 | 592 | pop_cfun (); |
3dafb85c | 593 | node->expand (); |
452aa9c5 RG |
594 | break; |
595 | ||
596 | default: | |
597 | gcc_unreachable (); | |
598 | } | |
599 | ||
600 | /* Set a personality if required and we already passed EH lowering. */ | |
601 | if (lowered | |
602 | && (function_needs_eh_personality (DECL_STRUCT_FUNCTION (fndecl)) | |
603 | == eh_personality_lang)) | |
604 | DECL_FUNCTION_PERSONALITY (fndecl) = lang_hooks.eh_personality (); | |
605 | } | |
606 | ||
e767b5be | 607 | /* Analyze the function scheduled to be output. */ |
d52f5295 ML |
608 | void |
609 | cgraph_node::analyze (void) | |
e767b5be | 610 | { |
c2e84327 DM |
611 | if (native_rtl_p ()) |
612 | { | |
613 | analyzed = true; | |
614 | return; | |
615 | } | |
616 | ||
d52f5295 | 617 | tree decl = this->decl; |
9c8305f8 JH |
618 | location_t saved_loc = input_location; |
619 | input_location = DECL_SOURCE_LOCATION (decl); | |
e767b5be | 620 | |
d52f5295 | 621 | if (thunk.thunk_p) |
c47d0034 | 622 | { |
9641fab3 JH |
623 | cgraph_node *t = cgraph_node::get (thunk.alias); |
624 | ||
1bad9c18 | 625 | create_edge (t, NULL, t->count); |
89bbe9ba | 626 | callees->can_throw_external = !TREE_NOTHROW (t->decl); |
9641fab3 JH |
627 | /* Target code in expand_thunk may need the thunk's target |
628 | to be analyzed, so recurse here. */ | |
44662f68 | 629 | if (!t->analyzed && t->definition) |
9641fab3 JH |
630 | t->analyze (); |
631 | if (t->alias) | |
632 | { | |
633 | t = t->get_alias_target (); | |
44662f68 | 634 | if (!t->analyzed && t->definition) |
9641fab3 JH |
635 | t->analyze (); |
636 | } | |
44662f68 | 637 | bool ret = expand_thunk (false, false); |
d52f5295 | 638 | thunk.alias = NULL; |
44662f68 EB |
639 | if (!ret) |
640 | return; | |
c47d0034 | 641 | } |
d52f5295 | 642 | if (alias) |
71e54687 | 643 | resolve_alias (cgraph_node::get (alias_target), transparent_alias); |
d52f5295 | 644 | else if (dispatcher_function) |
3649b9b7 ST |
645 | { |
646 | /* Generate the dispatcher body of multi-versioned functions. */ | |
3dafb85c | 647 | cgraph_function_version_info *dispatcher_version_info |
d52f5295 | 648 | = function_version (); |
3649b9b7 ST |
649 | if (dispatcher_version_info != NULL |
650 | && (dispatcher_version_info->dispatcher_resolver | |
651 | == NULL_TREE)) | |
652 | { | |
653 | tree resolver = NULL_TREE; | |
654 | gcc_assert (targetm.generate_version_dispatcher_body); | |
d52f5295 | 655 | resolver = targetm.generate_version_dispatcher_body (this); |
3649b9b7 ST |
656 | gcc_assert (resolver != NULL_TREE); |
657 | } | |
658 | } | |
c47d0034 JH |
659 | else |
660 | { | |
c47d0034 | 661 | push_cfun (DECL_STRUCT_FUNCTION (decl)); |
a406865a | 662 | |
9579db35 | 663 | assign_assembler_name_if_needed (decl); |
0e0a1359 | 664 | |
c47d0034 JH |
665 | /* Make sure to gimplify bodies only once. During analyzing a |
666 | function we lower it, which will require gimplified nested | |
667 | functions, so we can end up here with an already gimplified | |
668 | body. */ | |
355a7673 | 669 | if (!gimple_has_body_p (decl)) |
c47d0034 | 670 | gimplify_function_tree (decl); |
a406865a | 671 | |
26eb69c6 | 672 | /* Lower the function. */ |
d52f5295 | 673 | if (!lowered) |
26eb69c6 | 674 | { |
d52f5295 ML |
675 | if (nested) |
676 | lower_nested_functions (decl); | |
677 | gcc_assert (!nested); | |
26eb69c6 RG |
678 | |
679 | gimple_register_cfg_hooks (); | |
680 | bitmap_obstack_initialize (NULL); | |
2cbf2d95 | 681 | execute_pass_list (cfun, g->get_passes ()->all_lowering_passes); |
26eb69c6 RG |
682 | free_dominance_info (CDI_POST_DOMINATORS); |
683 | free_dominance_info (CDI_DOMINATORS); | |
684 | compact_blocks (); | |
685 | bitmap_obstack_release (NULL); | |
d52f5295 | 686 | lowered = true; |
26eb69c6 RG |
687 | } |
688 | ||
c47d0034 JH |
689 | pop_cfun (); |
690 | } | |
d52f5295 | 691 | analyzed = true; |
e767b5be | 692 | |
9c8305f8 | 693 | input_location = saved_loc; |
e767b5be JH |
694 | } |
695 | ||
39e2db00 JH |
696 | /* C++ frontend produce same body aliases all over the place, even before PCH |
697 | gets streamed out. It relies on us linking the aliases with their function | |
698 | in order to do the fixups, but ipa-ref is not PCH safe. Consequentely we | |
699 | first produce aliases without links, but once C++ FE is sure he won't sream | |
700 | PCH we build the links via this function. */ | |
701 | ||
702 | void | |
3dafb85c | 703 | symbol_table::process_same_body_aliases (void) |
39e2db00 | 704 | { |
5e20cdc9 | 705 | symtab_node *node; |
40a7fe1e | 706 | FOR_EACH_SYMBOL (node) |
67348ccc | 707 | if (node->cpp_implicit_alias && !node->analyzed) |
d52f5295 | 708 | node->resolve_alias |
8813a647 | 709 | (VAR_P (node->alias_target) |
9041d2e6 | 710 | ? (symtab_node *)varpool_node::get_create (node->alias_target) |
d52f5295 | 711 | : (symtab_node *)cgraph_node::get_create (node->alias_target)); |
40a7fe1e | 712 | cpp_implicit_aliases_done = true; |
39e2db00 JH |
713 | } |
714 | ||
768e3c60 RG |
715 | /* Process attributes common for vars and functions. */ |
716 | ||
717 | static void | |
7861b648 | 718 | process_common_attributes (symtab_node *node, tree decl) |
768e3c60 RG |
719 | { |
720 | tree weakref = lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)); | |
721 | ||
722 | if (weakref && !lookup_attribute ("alias", DECL_ATTRIBUTES (decl))) | |
723 | { | |
724 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
725 | "%<weakref%> attribute should be accompanied with" | |
726 | " an %<alias%> attribute"); | |
727 | DECL_WEAK (decl) = 0; | |
779d4b91 JH |
728 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", |
729 | DECL_ATTRIBUTES (decl)); | |
768e3c60 | 730 | } |
7861b648 AK |
731 | |
732 | if (lookup_attribute ("no_reorder", DECL_ATTRIBUTES (decl))) | |
733 | node->no_reorder = 1; | |
768e3c60 RG |
734 | } |
735 | ||
386b46cf JH |
736 | /* Look for externally_visible and used attributes and mark cgraph nodes |
737 | accordingly. | |
738 | ||
739 | We cannot mark the nodes at the point the attributes are processed (in | |
740 | handle_*_attribute) because the copy of the declarations available at that | |
741 | point may not be canonical. For example, in: | |
742 | ||
743 | void f(); | |
744 | void f() __attribute__((used)); | |
745 | ||
746 | the declaration we see in handle_used_attribute will be the second | |
747 | declaration -- but the front end will subsequently merge that declaration | |
748 | with the original declaration and discard the second declaration. | |
749 | ||
3dafb85c | 750 | Furthermore, we can't mark these nodes in finalize_function because: |
386b46cf JH |
751 | |
752 | void f() {} | |
753 | void f() __attribute__((externally_visible)); | |
754 | ||
755 | is valid. | |
756 | ||
757 | So, we walk the nodes at the end of the translation unit, applying the | |
758 | attributes at that point. */ | |
759 | ||
760 | static void | |
3dafb85c | 761 | process_function_and_variable_attributes (cgraph_node *first, |
2c8326a5 | 762 | varpool_node *first_var) |
386b46cf | 763 | { |
3dafb85c | 764 | cgraph_node *node; |
2c8326a5 | 765 | varpool_node *vnode; |
386b46cf | 766 | |
3dafb85c ML |
767 | for (node = symtab->first_function (); node != first; |
768 | node = symtab->next_function (node)) | |
386b46cf | 769 | { |
67348ccc | 770 | tree decl = node->decl; |
b42186f1 | 771 | if (DECL_PRESERVE_P (decl)) |
d52f5295 | 772 | node->mark_force_output (); |
9d602c59 | 773 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
386b46cf | 774 | { |
67348ccc DM |
775 | if (! TREE_PUBLIC (node->decl)) |
776 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, | |
c5d75364 MLI |
777 | "%<externally_visible%>" |
778 | " attribute have effect only on public objects"); | |
386b46cf | 779 | } |
779d4b91 | 780 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
67348ccc | 781 | && (node->definition && !node->alias)) |
779d4b91 | 782 | { |
67348ccc | 783 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, |
779d4b91 JH |
784 | "%<weakref%> attribute ignored" |
785 | " because function is defined"); | |
786 | DECL_WEAK (decl) = 0; | |
787 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
788 | DECL_ATTRIBUTES (decl)); | |
789 | } | |
96c545e5 ML |
790 | else if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)) |
791 | && node->definition | |
792 | && !node->alias) | |
793 | warning_at (DECL_SOURCE_LOCATION (node->decl), OPT_Wattributes, | |
794 | "%<alias%> attribute ignored" | |
795 | " because function is defined"); | |
c9fc06dc CB |
796 | |
797 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl)) | |
798 | && !DECL_DECLARED_INLINE_P (decl) | |
799 | /* redefining extern inline function makes it DECL_UNINLINABLE. */ | |
800 | && !DECL_UNINLINABLE (decl)) | |
801 | warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes, | |
a9c697b8 MS |
802 | "%<always_inline%> function might not be inlinable"); |
803 | ||
7861b648 | 804 | process_common_attributes (node, decl); |
386b46cf | 805 | } |
3dafb85c ML |
806 | for (vnode = symtab->first_variable (); vnode != first_var; |
807 | vnode = symtab->next_variable (vnode)) | |
386b46cf | 808 | { |
67348ccc | 809 | tree decl = vnode->decl; |
6649df51 | 810 | if (DECL_EXTERNAL (decl) |
6a6dac52 | 811 | && DECL_INITIAL (decl)) |
9041d2e6 | 812 | varpool_node::finalize_decl (decl); |
b42186f1 | 813 | if (DECL_PRESERVE_P (decl)) |
67348ccc | 814 | vnode->force_output = true; |
9d602c59 | 815 | else if (lookup_attribute ("externally_visible", DECL_ATTRIBUTES (decl))) |
386b46cf | 816 | { |
67348ccc DM |
817 | if (! TREE_PUBLIC (vnode->decl)) |
818 | warning_at (DECL_SOURCE_LOCATION (vnode->decl), OPT_Wattributes, | |
c5d75364 MLI |
819 | "%<externally_visible%>" |
820 | " attribute have effect only on public objects"); | |
386b46cf | 821 | } |
779d4b91 | 822 | if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)) |
67348ccc | 823 | && vnode->definition |
779d4b91 JH |
824 | && DECL_INITIAL (decl)) |
825 | { | |
67348ccc | 826 | warning_at (DECL_SOURCE_LOCATION (vnode->decl), OPT_Wattributes, |
779d4b91 JH |
827 | "%<weakref%> attribute ignored" |
828 | " because variable is initialized"); | |
829 | DECL_WEAK (decl) = 0; | |
830 | DECL_ATTRIBUTES (decl) = remove_attribute ("weakref", | |
831 | DECL_ATTRIBUTES (decl)); | |
832 | } | |
7861b648 | 833 | process_common_attributes (vnode, decl); |
386b46cf JH |
834 | } |
835 | } | |
836 | ||
66058468 JH |
837 | /* Mark DECL as finalized. By finalizing the declaration, frontend instruct the |
838 | middle end to output the variable to asm file, if needed or externally | |
839 | visible. */ | |
840 | ||
841 | void | |
9041d2e6 | 842 | varpool_node::finalize_decl (tree decl) |
66058468 | 843 | { |
9041d2e6 | 844 | varpool_node *node = varpool_node::get_create (decl); |
66058468 | 845 | |
387df871 | 846 | gcc_assert (TREE_STATIC (decl) || DECL_EXTERNAL (decl)); |
66058468 | 847 | |
67348ccc | 848 | if (node->definition) |
66058468 | 849 | return; |
6a1e352e L |
850 | /* Set definition first before calling notice_global_symbol so that |
851 | it is available to notice_global_symbol. */ | |
67348ccc | 852 | node->definition = true; |
6a1e352e | 853 | notice_global_symbol (decl); |
0eaf0bfe JH |
854 | if (!flag_toplevel_reorder) |
855 | node->no_reorder = true; | |
66058468 JH |
856 | if (TREE_THIS_VOLATILE (decl) || DECL_PRESERVE_P (decl) |
857 | /* Traditionally we do not eliminate static variables when not | |
858 | optimizing and when not doing toplevel reoder. */ | |
0eaf0bfe JH |
859 | || (node->no_reorder && !DECL_COMDAT (node->decl) |
860 | && !DECL_ARTIFICIAL (node->decl))) | |
67348ccc | 861 | node->force_output = true; |
66058468 | 862 | |
3dafb85c ML |
863 | if (symtab->state == CONSTRUCTION |
864 | && (node->needed_p () || node->referred_to_p ())) | |
67348ccc | 865 | enqueue_node (node); |
3dafb85c | 866 | if (symtab->state >= IPA_SSA) |
9041d2e6 | 867 | node->analyze (); |
0d6bf48c JH |
868 | /* Some frontends produce various interface variables after compilation |
869 | finished. */ | |
3dafb85c | 870 | if (symtab->state == FINISHED |
0eaf0bfe JH |
871 | || (node->no_reorder |
872 | && symtab->state == EXPANSION)) | |
9041d2e6 | 873 | node->assemble_decl (); |
66058468 JH |
874 | } |
875 | ||
e18412fc JH |
876 | /* EDGE is an polymorphic call. Mark all possible targets as reachable |
877 | and if there is only one target, perform trivial devirtualization. | |
878 | REACHABLE_CALL_TARGETS collects target lists we already walked to | |
879 | avoid udplicate work. */ | |
880 | ||
881 | static void | |
6e2830c3 | 882 | walk_polymorphic_call_targets (hash_set<void *> *reachable_call_targets, |
3dafb85c | 883 | cgraph_edge *edge) |
e18412fc JH |
884 | { |
885 | unsigned int i; | |
886 | void *cache_token; | |
887 | bool final; | |
888 | vec <cgraph_node *>targets | |
889 | = possible_polymorphic_call_targets | |
890 | (edge, &final, &cache_token); | |
891 | ||
6e2830c3 | 892 | if (!reachable_call_targets->add (cache_token)) |
e18412fc | 893 | { |
3dafb85c | 894 | if (symtab->dump_file) |
e18412fc | 895 | dump_possible_polymorphic_call_targets |
3dafb85c | 896 | (symtab->dump_file, edge); |
e18412fc | 897 | |
c3284718 | 898 | for (i = 0; i < targets.length (); i++) |
e18412fc JH |
899 | { |
900 | /* Do not bother to mark virtual methods in anonymous namespace; | |
901 | either we will find use of virtual table defining it, or it is | |
902 | unused. */ | |
67348ccc | 903 | if (targets[i]->definition |
e18412fc | 904 | && TREE_CODE |
67348ccc | 905 | (TREE_TYPE (targets[i]->decl)) |
e18412fc JH |
906 | == METHOD_TYPE |
907 | && !type_in_anonymous_namespace_p | |
70e7f2a2 JH |
908 | (TYPE_METHOD_BASETYPE (TREE_TYPE (targets[i]->decl)))) |
909 | enqueue_node (targets[i]); | |
e18412fc JH |
910 | } |
911 | } | |
912 | ||
913 | /* Very trivial devirtualization; when the type is | |
914 | final or anonymous (so we know all its derivation) | |
915 | and there is only one possible virtual call target, | |
916 | make the edge direct. */ | |
917 | if (final) | |
918 | { | |
2b5f0895 | 919 | if (targets.length () <= 1 && dbg_cnt (devirt)) |
e18412fc | 920 | { |
3462aa02 JH |
921 | cgraph_node *target; |
922 | if (targets.length () == 1) | |
923 | target = targets[0]; | |
924 | else | |
d52f5295 ML |
925 | target = cgraph_node::create |
926 | (builtin_decl_implicit (BUILT_IN_UNREACHABLE)); | |
3462aa02 | 927 | |
3dafb85c | 928 | if (symtab->dump_file) |
e18412fc | 929 | { |
3dafb85c | 930 | fprintf (symtab->dump_file, |
e18412fc | 931 | "Devirtualizing call: "); |
3dafb85c | 932 | print_gimple_stmt (symtab->dump_file, |
e18412fc JH |
933 | edge->call_stmt, 0, |
934 | TDF_SLIM); | |
935 | } | |
2b5f0895 XDL |
936 | if (dump_enabled_p ()) |
937 | { | |
4f5b9c80 | 938 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, edge->call_stmt, |
2b5f0895 XDL |
939 | "devirtualizing call in %s to %s\n", |
940 | edge->caller->name (), target->name ()); | |
941 | } | |
942 | ||
3dafb85c ML |
943 | edge->make_direct (target); |
944 | edge->redirect_call_stmt_to_callee (); | |
d5e254e1 | 945 | |
3dafb85c | 946 | if (symtab->dump_file) |
e18412fc | 947 | { |
3dafb85c | 948 | fprintf (symtab->dump_file, |
e18412fc | 949 | "Devirtualized as: "); |
3dafb85c | 950 | print_gimple_stmt (symtab->dump_file, |
e18412fc JH |
951 | edge->call_stmt, 0, |
952 | TDF_SLIM); | |
953 | } | |
954 | } | |
955 | } | |
956 | } | |
957 | ||
4ec39494 MLI |
958 | /* Issue appropriate warnings for the global declaration DECL. */ |
959 | ||
960 | static void | |
961 | check_global_declaration (symtab_node *snode) | |
962 | { | |
261e741f | 963 | const char *decl_file; |
4ec39494 MLI |
964 | tree decl = snode->decl; |
965 | ||
966 | /* Warn about any function declared static but not defined. We don't | |
967 | warn about variables, because many programs have static variables | |
968 | that exist only to get some text into the object file. */ | |
969 | if (TREE_CODE (decl) == FUNCTION_DECL | |
970 | && DECL_INITIAL (decl) == 0 | |
971 | && DECL_EXTERNAL (decl) | |
972 | && ! DECL_ARTIFICIAL (decl) | |
973 | && ! TREE_NO_WARNING (decl) | |
974 | && ! TREE_PUBLIC (decl) | |
975 | && (warn_unused_function | |
976 | || snode->referred_to_p (/*include_self=*/false))) | |
977 | { | |
978 | if (snode->referred_to_p (/*include_self=*/false)) | |
979 | pedwarn (input_location, 0, "%q+F used but never defined", decl); | |
980 | else | |
981 | warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl); | |
982 | /* This symbol is effectively an "extern" declaration now. */ | |
983 | TREE_PUBLIC (decl) = 1; | |
984 | } | |
985 | ||
986 | /* Warn about static fns or vars defined but not used. */ | |
987 | if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL) | |
988 | || (((warn_unused_variable && ! TREE_READONLY (decl)) | |
4246c8da MW |
989 | || (warn_unused_const_variable > 0 && TREE_READONLY (decl) |
990 | && (warn_unused_const_variable == 2 | |
261e741f MW |
991 | || (main_input_filename != NULL |
992 | && (decl_file = DECL_SOURCE_FILE (decl)) != NULL | |
993 | && filename_cmp (main_input_filename, | |
994 | decl_file) == 0)))) | |
8813a647 | 995 | && VAR_P (decl))) |
4ec39494 MLI |
996 | && ! DECL_IN_SYSTEM_HEADER (decl) |
997 | && ! snode->referred_to_p (/*include_self=*/false) | |
998 | /* This TREE_USED check is needed in addition to referred_to_p | |
999 | above, because the `__unused__' attribute is not being | |
1000 | considered for referred_to_p. */ | |
1001 | && ! TREE_USED (decl) | |
1002 | /* The TREE_USED bit for file-scope decls is kept in the identifier, | |
1003 | to handle multiple external decls in different scopes. */ | |
1004 | && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl))) | |
1005 | && ! DECL_EXTERNAL (decl) | |
1006 | && ! DECL_ARTIFICIAL (decl) | |
1007 | && ! DECL_ABSTRACT_ORIGIN (decl) | |
1008 | && ! TREE_PUBLIC (decl) | |
1009 | /* A volatile variable might be used in some non-obvious way. */ | |
8b6ab677 | 1010 | && (! VAR_P (decl) || ! TREE_THIS_VOLATILE (decl)) |
4ec39494 | 1011 | /* Global register variables must be declared to reserve them. */ |
8813a647 | 1012 | && ! (VAR_P (decl) && DECL_REGISTER (decl)) |
4ec39494 MLI |
1013 | /* Global ctors and dtors are called by the runtime. */ |
1014 | && (TREE_CODE (decl) != FUNCTION_DECL | |
1015 | || (!DECL_STATIC_CONSTRUCTOR (decl) | |
1016 | && !DECL_STATIC_DESTRUCTOR (decl))) | |
1017 | /* Otherwise, ask the language. */ | |
1018 | && lang_hooks.decls.warn_unused_global (decl)) | |
1019 | warning_at (DECL_SOURCE_LOCATION (decl), | |
1020 | (TREE_CODE (decl) == FUNCTION_DECL) | |
1021 | ? OPT_Wunused_function | |
1022 | : (TREE_READONLY (decl) | |
4246c8da | 1023 | ? OPT_Wunused_const_variable_ |
4ec39494 MLI |
1024 | : OPT_Wunused_variable), |
1025 | "%qD defined but not used", decl); | |
1026 | } | |
5d59b5e1 | 1027 | |
66058468 JH |
1028 | /* Discover all functions and variables that are trivially needed, analyze |
1029 | them as well as all functions and variables referred by them */ | |
3edf64aa DM |
1030 | static cgraph_node *first_analyzed; |
1031 | static varpool_node *first_analyzed_var; | |
1c4a429a | 1032 | |
d7438551 AH |
1033 | /* FIRST_TIME is set to TRUE for the first time we are called for a |
1034 | translation unit from finalize_compilation_unit() or false | |
1035 | otherwise. */ | |
1036 | ||
151e6f24 | 1037 | static void |
d7438551 | 1038 | analyze_functions (bool first_time) |
1c4a429a | 1039 | { |
cd9c7bd2 | 1040 | /* Keep track of already processed nodes when called multiple times for |
aabcd309 | 1041 | intermodule optimization. */ |
3dafb85c | 1042 | cgraph_node *first_handled = first_analyzed; |
2c8326a5 | 1043 | varpool_node *first_handled_var = first_analyzed_var; |
6e2830c3 | 1044 | hash_set<void *> reachable_call_targets; |
66058468 | 1045 | |
5e20cdc9 DM |
1046 | symtab_node *node; |
1047 | symtab_node *next; | |
66058468 | 1048 | int i; |
3dafb85c | 1049 | ipa_ref *ref; |
66058468 | 1050 | bool changed = true; |
4f90d3e0 | 1051 | location_t saved_loc = input_location; |
1c4a429a | 1052 | |
1389294c | 1053 | bitmap_obstack_initialize (NULL); |
3dafb85c | 1054 | symtab->state = CONSTRUCTION; |
4f90d3e0 | 1055 | input_location = UNKNOWN_LOCATION; |
1c4a429a | 1056 | |
67914693 | 1057 | /* Ugly, but the fixup cannot happen at a time same body alias is created; |
40a7fe1e | 1058 | C++ FE is confused about the COMDAT groups being right. */ |
3dafb85c | 1059 | if (symtab->cpp_implicit_aliases_done) |
40a7fe1e | 1060 | FOR_EACH_SYMBOL (node) |
67348ccc | 1061 | if (node->cpp_implicit_alias) |
d52f5295 | 1062 | node->fixup_same_cpp_alias_visibility (node->get_alias_target ()); |
2bf86c84 | 1063 | build_type_inheritance_graph (); |
40a7fe1e | 1064 | |
66058468 JH |
1065 | /* Analysis adds static variables that in turn adds references to new functions. |
1066 | So we need to iterate the process until it stabilize. */ | |
1067 | while (changed) | |
1c4a429a | 1068 | { |
66058468 JH |
1069 | changed = false; |
1070 | process_function_and_variable_attributes (first_analyzed, | |
1071 | first_analyzed_var); | |
1072 | ||
1073 | /* First identify the trivially needed symbols. */ | |
3dafb85c | 1074 | for (node = symtab->first_symbol (); |
67348ccc DM |
1075 | node != first_analyzed |
1076 | && node != first_analyzed_var; node = node->next) | |
d71cc23f | 1077 | { |
d67ff7b7 JM |
1078 | /* Convert COMDAT group designators to IDENTIFIER_NODEs. */ |
1079 | node->get_comdat_group_id (); | |
3dafb85c | 1080 | if (node->needed_p ()) |
66058468 JH |
1081 | { |
1082 | enqueue_node (node); | |
3dafb85c ML |
1083 | if (!changed && symtab->dump_file) |
1084 | fprintf (symtab->dump_file, "Trivially needed symbols:"); | |
66058468 | 1085 | changed = true; |
3dafb85c ML |
1086 | if (symtab->dump_file) |
1087 | fprintf (symtab->dump_file, " %s", node->asm_name ()); | |
1088 | if (!changed && symtab->dump_file) | |
1089 | fprintf (symtab->dump_file, "\n"); | |
66058468 | 1090 | } |
67348ccc DM |
1091 | if (node == first_analyzed |
1092 | || node == first_analyzed_var) | |
66058468 | 1093 | break; |
d71cc23f | 1094 | } |
3dafb85c ML |
1095 | symtab->process_new_functions (); |
1096 | first_analyzed_var = symtab->first_variable (); | |
1097 | first_analyzed = symtab->first_function (); | |
cd4dea62 | 1098 | |
3dafb85c ML |
1099 | if (changed && symtab->dump_file) |
1100 | fprintf (symtab->dump_file, "\n"); | |
8dafba3c | 1101 | |
66058468 JH |
1102 | /* Lower representation, build callgraph edges and references for all trivially |
1103 | needed symbols and all symbols referred by them. */ | |
b4d05578 | 1104 | while (queued_nodes != &symtab_terminator) |
b66887e4 | 1105 | { |
66058468 | 1106 | changed = true; |
b4d05578 BS |
1107 | node = queued_nodes; |
1108 | queued_nodes = (symtab_node *)queued_nodes->aux; | |
7de90a6c | 1109 | cgraph_node *cnode = dyn_cast <cgraph_node *> (node); |
67348ccc | 1110 | if (cnode && cnode->definition) |
66058468 | 1111 | { |
3dafb85c | 1112 | cgraph_edge *edge; |
67348ccc | 1113 | tree decl = cnode->decl; |
66058468 | 1114 | |
5d59b5e1 LC |
1115 | /* ??? It is possible to create extern inline function |
1116 | and later using weak alias attribute to kill its body. | |
1117 | See gcc.c-torture/compile/20011119-1.c */ | |
66058468 | 1118 | if (!DECL_STRUCT_FUNCTION (decl) |
67348ccc | 1119 | && !cnode->alias |
3649b9b7 ST |
1120 | && !cnode->thunk.thunk_p |
1121 | && !cnode->dispatcher_function) | |
66058468 | 1122 | { |
d52f5295 | 1123 | cnode->reset (); |
66058468 JH |
1124 | cnode->local.redefined_extern_inline = true; |
1125 | continue; | |
1126 | } | |
b66887e4 | 1127 | |
67348ccc | 1128 | if (!cnode->analyzed) |
d52f5295 | 1129 | cnode->analyze (); |
6b20f353 | 1130 | |
66058468 | 1131 | for (edge = cnode->callees; edge; edge = edge->next_callee) |
1bf7c324 JH |
1132 | if (edge->callee->definition |
1133 | && (!DECL_EXTERNAL (edge->callee->decl) | |
1134 | /* When not optimizing, do not try to analyze extern | |
1135 | inline functions. Doing so is pointless. */ | |
1136 | || opt_for_fn (edge->callee->decl, optimize) | |
1137 | /* Weakrefs needs to be preserved. */ | |
1138 | || edge->callee->alias | |
1139 | /* always_inline functions are inlined aven at -O0. */ | |
1140 | || lookup_attribute | |
1141 | ("always_inline", | |
1142 | DECL_ATTRIBUTES (edge->callee->decl)) | |
1143 | /* Multiversioned functions needs the dispatcher to | |
1144 | be produced locally even for extern functions. */ | |
1145 | || edge->callee->function_version ())) | |
67348ccc | 1146 | enqueue_node (edge->callee); |
2bf86c84 JH |
1147 | if (opt_for_fn (cnode->decl, optimize) |
1148 | && opt_for_fn (cnode->decl, flag_devirtualize)) | |
eefe9a99 | 1149 | { |
3dafb85c | 1150 | cgraph_edge *next; |
e18412fc JH |
1151 | |
1152 | for (edge = cnode->indirect_calls; edge; edge = next) | |
c4be6568 JH |
1153 | { |
1154 | next = edge->next_callee; | |
1155 | if (edge->indirect_info->polymorphic) | |
6e2830c3 | 1156 | walk_polymorphic_call_targets (&reachable_call_targets, |
e18412fc | 1157 | edge); |
c4be6568 | 1158 | } |
eefe9a99 | 1159 | } |
66058468 | 1160 | |
5d59b5e1 | 1161 | /* If decl is a clone of an abstract function, |
0bfd099c RB |
1162 | mark that abstract function so that we don't release its body. |
1163 | The DECL_INITIAL() of that abstract function declaration | |
1164 | will be later needed to output debug info. */ | |
66058468 JH |
1165 | if (DECL_ABSTRACT_ORIGIN (decl)) |
1166 | { | |
3dafb85c | 1167 | cgraph_node *origin_node |
c84495c0 | 1168 | = cgraph_node::get_create (DECL_ABSTRACT_ORIGIN (decl)); |
c0c123ef | 1169 | origin_node->used_as_abstract_origin = true; |
66058468 | 1170 | } |
0bfd099c RB |
1171 | /* Preserve a functions function context node. It will |
1172 | later be needed to output debug info. */ | |
1173 | if (tree fn = decl_function_context (decl)) | |
1174 | { | |
1175 | cgraph_node *origin_node = cgraph_node::get_create (fn); | |
1176 | enqueue_node (origin_node); | |
1177 | } | |
66058468 | 1178 | } |
5d59b5e1 LC |
1179 | else |
1180 | { | |
7de90a6c | 1181 | varpool_node *vnode = dyn_cast <varpool_node *> (node); |
67348ccc | 1182 | if (vnode && vnode->definition && !vnode->analyzed) |
9041d2e6 | 1183 | vnode->analyze (); |
5d59b5e1 | 1184 | } |
66058468 | 1185 | |
67348ccc | 1186 | if (node->same_comdat_group) |
66058468 | 1187 | { |
5e20cdc9 | 1188 | symtab_node *next; |
67348ccc | 1189 | for (next = node->same_comdat_group; |
66058468 | 1190 | next != node; |
67348ccc | 1191 | next = next->same_comdat_group) |
1bf7c324 JH |
1192 | if (!next->comdat_local_p ()) |
1193 | enqueue_node (next); | |
66058468 | 1194 | } |
d122681a | 1195 | for (i = 0; node->iterate_reference (i, ref); i++) |
1bf7c324 JH |
1196 | if (ref->referred->definition |
1197 | && (!DECL_EXTERNAL (ref->referred->decl) | |
1198 | || ((TREE_CODE (ref->referred->decl) != FUNCTION_DECL | |
1199 | && optimize) | |
1200 | || (TREE_CODE (ref->referred->decl) == FUNCTION_DECL | |
1201 | && opt_for_fn (ref->referred->decl, optimize)) | |
38c1b72f | 1202 | || node->alias |
1bf7c324 | 1203 | || ref->referred->alias))) |
66058468 | 1204 | enqueue_node (ref->referred); |
3dafb85c | 1205 | symtab->process_new_functions (); |
66058468 | 1206 | } |
1c4a429a | 1207 | } |
2bf86c84 | 1208 | update_type_inheritance_graph (); |
8dafba3c | 1209 | |
564738df | 1210 | /* Collect entry points to the unit. */ |
3dafb85c | 1211 | if (symtab->dump_file) |
1668aabc | 1212 | { |
3dafb85c | 1213 | fprintf (symtab->dump_file, "\n\nInitial "); |
6c52831d | 1214 | symtab->dump (symtab->dump_file); |
1668aabc | 1215 | } |
7660e67e | 1216 | |
d7438551 AH |
1217 | if (first_time) |
1218 | { | |
1219 | symtab_node *snode; | |
1220 | FOR_EACH_SYMBOL (snode) | |
4ec39494 | 1221 | check_global_declaration (snode); |
d7438551 AH |
1222 | } |
1223 | ||
3dafb85c ML |
1224 | if (symtab->dump_file) |
1225 | fprintf (symtab->dump_file, "\nRemoving unused symbols:"); | |
1c4a429a | 1226 | |
3dafb85c | 1227 | for (node = symtab->first_symbol (); |
67348ccc DM |
1228 | node != first_handled |
1229 | && node != first_handled_var; node = next) | |
1c4a429a | 1230 | { |
67348ccc | 1231 | next = node->next; |
baaf860b JH |
1232 | /* For symbols declared locally we clear TREE_READONLY when emitting |
1233 | the construtor (if one is needed). For external declarations we can | |
1234 | not safely assume that the type is readonly because we may be called | |
1235 | during its construction. */ | |
1236 | if (TREE_CODE (node->decl) == VAR_DECL | |
1237 | && TYPE_P (TREE_TYPE (node->decl)) | |
1238 | && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (node->decl)) | |
1239 | && DECL_EXTERNAL (node->decl)) | |
1240 | TREE_READONLY (node->decl) = 0; | |
3dafb85c | 1241 | if (!node->aux && !node->referred_to_p ()) |
1c4a429a | 1242 | { |
3dafb85c ML |
1243 | if (symtab->dump_file) |
1244 | fprintf (symtab->dump_file, " %s", node->name ()); | |
d7438551 AH |
1245 | |
1246 | /* See if the debugger can use anything before the DECL | |
1247 | passes away. Perhaps it can notice a DECL that is now a | |
1248 | constant and can tag the early DIE with an appropriate | |
1249 | attribute. | |
1250 | ||
1251 | Otherwise, this is the last chance the debug_hooks have | |
1252 | at looking at optimized away DECLs, since | |
1253 | late_global_decl will subsequently be called from the | |
1254 | contents of the now pruned symbol table. */ | |
8813a647 | 1255 | if (VAR_P (node->decl) |
e6358ebd RB |
1256 | && !decl_function_context (node->decl)) |
1257 | { | |
1258 | /* We are reclaiming totally unreachable code and variables | |
1259 | so they effectively appear as readonly. Show that to | |
1260 | the debug machinery. */ | |
1261 | TREE_READONLY (node->decl) = 1; | |
775669c1 | 1262 | node->definition = false; |
e6358ebd RB |
1263 | (*debug_hooks->late_global_decl) (node->decl); |
1264 | } | |
d7438551 | 1265 | |
d52f5295 | 1266 | node->remove (); |
d71cc23f | 1267 | continue; |
1c4a429a | 1268 | } |
7de90a6c | 1269 | if (cgraph_node *cnode = dyn_cast <cgraph_node *> (node)) |
66058468 | 1270 | { |
67348ccc | 1271 | tree decl = node->decl; |
66058468 | 1272 | |
67348ccc DM |
1273 | if (cnode->definition && !gimple_has_body_p (decl) |
1274 | && !cnode->alias | |
66058468 | 1275 | && !cnode->thunk.thunk_p) |
d52f5295 | 1276 | cnode->reset (); |
66058468 | 1277 | |
67348ccc DM |
1278 | gcc_assert (!cnode->definition || cnode->thunk.thunk_p |
1279 | || cnode->alias | |
c2e84327 DM |
1280 | || gimple_has_body_p (decl) |
1281 | || cnode->native_rtl_p ()); | |
67348ccc | 1282 | gcc_assert (cnode->analyzed == cnode->definition); |
66058468 | 1283 | } |
67348ccc | 1284 | node->aux = NULL; |
1c4a429a | 1285 | } |
67348ccc DM |
1286 | for (;node; node = node->next) |
1287 | node->aux = NULL; | |
3dafb85c ML |
1288 | first_analyzed = symtab->first_function (); |
1289 | first_analyzed_var = symtab->first_variable (); | |
1290 | if (symtab->dump_file) | |
7d82fe7c | 1291 | { |
3dafb85c | 1292 | fprintf (symtab->dump_file, "\n\nReclaimed "); |
6c52831d | 1293 | symtab->dump (symtab->dump_file); |
7d82fe7c | 1294 | } |
1389294c | 1295 | bitmap_obstack_release (NULL); |
1c4a429a | 1296 | ggc_collect (); |
d352b245 JH |
1297 | /* Initialize assembler name hash, in particular we want to trigger C++ |
1298 | mangling and same body alias creation before we free DECL_ARGUMENTS | |
1299 | used by it. */ | |
1300 | if (!seen_error ()) | |
3dafb85c | 1301 | symtab->symtab_initialize_asm_name_hash (); |
4f90d3e0 JH |
1302 | |
1303 | input_location = saved_loc; | |
151e6f24 JH |
1304 | } |
1305 | ||
7a866e7e MS |
1306 | /* Check declaration of the type of ALIAS for compatibility with its TARGET |
1307 | (which may be an ifunc resolver) and issue a diagnostic when they are | |
1308 | not compatible according to language rules (plus a C++ extension for | |
1309 | non-static member functions). */ | |
1310 | ||
1311 | static void | |
1312 | maybe_diag_incompatible_alias (tree alias, tree target) | |
1313 | { | |
1314 | tree altype = TREE_TYPE (alias); | |
1315 | tree targtype = TREE_TYPE (target); | |
1316 | ||
aab778d3 | 1317 | bool ifunc = cgraph_node::get (alias)->ifunc_resolver; |
7a866e7e MS |
1318 | tree funcptr = altype; |
1319 | ||
1320 | if (ifunc) | |
1321 | { | |
1322 | /* Handle attribute ifunc first. */ | |
1323 | if (TREE_CODE (altype) == METHOD_TYPE) | |
1324 | { | |
1325 | /* Set FUNCPTR to the type of the alias target. If the type | |
1326 | is a non-static member function of class C, construct a type | |
1327 | of an ordinary function taking C* as the first argument, | |
1328 | followed by the member function argument list, and use it | |
1329 | instead to check for incompatibility. This conversion is | |
1330 | not defined by the language but an extension provided by | |
1331 | G++. */ | |
1332 | ||
1333 | tree rettype = TREE_TYPE (altype); | |
1334 | tree args = TYPE_ARG_TYPES (altype); | |
1335 | altype = build_function_type (rettype, args); | |
1336 | funcptr = altype; | |
1337 | } | |
1338 | ||
1339 | targtype = TREE_TYPE (targtype); | |
1340 | ||
1341 | if (POINTER_TYPE_P (targtype)) | |
1342 | { | |
1343 | targtype = TREE_TYPE (targtype); | |
1344 | ||
1345 | /* Only issue Wattribute-alias for conversions to void* with | |
1346 | -Wextra. */ | |
1347 | if (VOID_TYPE_P (targtype) && !extra_warnings) | |
1348 | return; | |
1349 | ||
1350 | /* Proceed to handle incompatible ifunc resolvers below. */ | |
1351 | } | |
1352 | else | |
1353 | { | |
1354 | funcptr = build_pointer_type (funcptr); | |
1355 | ||
1356 | error_at (DECL_SOURCE_LOCATION (target), | |
1357 | "%<ifunc%> resolver for %qD must return %qT", | |
1358 | alias, funcptr); | |
1359 | inform (DECL_SOURCE_LOCATION (alias), | |
1360 | "resolver indirect function declared here"); | |
1361 | return; | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | if ((!FUNC_OR_METHOD_TYPE_P (targtype) | |
1366 | || (prototype_p (altype) | |
1367 | && prototype_p (targtype) | |
1368 | && !types_compatible_p (altype, targtype)))) | |
1369 | { | |
1370 | /* Warn for incompatibilities. Avoid warning for functions | |
1371 | without a prototype to make it possible to declare aliases | |
1372 | without knowing the exact type, as libstdc++ does. */ | |
1373 | if (ifunc) | |
1374 | { | |
1375 | funcptr = build_pointer_type (funcptr); | |
1376 | ||
097f82ec | 1377 | auto_diagnostic_group d; |
7a866e7e | 1378 | if (warning_at (DECL_SOURCE_LOCATION (target), |
79a2c428 | 1379 | OPT_Wattribute_alias_, |
7a866e7e MS |
1380 | "%<ifunc%> resolver for %qD should return %qT", |
1381 | alias, funcptr)) | |
1382 | inform (DECL_SOURCE_LOCATION (alias), | |
1383 | "resolver indirect function declared here"); | |
1384 | } | |
097f82ec DM |
1385 | else |
1386 | { | |
1387 | auto_diagnostic_group d; | |
1388 | if (warning_at (DECL_SOURCE_LOCATION (alias), | |
79a2c428 | 1389 | OPT_Wattribute_alias_, |
097f82ec DM |
1390 | "%qD alias between functions of incompatible " |
1391 | "types %qT and %qT", alias, altype, targtype)) | |
1392 | inform (DECL_SOURCE_LOCATION (target), | |
79a2c428 | 1393 | "aliased declaration here"); |
097f82ec | 1394 | } |
7a866e7e MS |
1395 | } |
1396 | } | |
1397 | ||
85ce9375 JH |
1398 | /* Translate the ugly representation of aliases as alias pairs into nice |
1399 | representation in callgraph. We don't handle all cases yet, | |
4f219961 | 1400 | unfortunately. */ |
85ce9375 JH |
1401 | |
1402 | static void | |
1403 | handle_alias_pairs (void) | |
1404 | { | |
1405 | alias_pair *p; | |
1406 | unsigned i; | |
7a866e7e | 1407 | |
9771b263 | 1408 | for (i = 0; alias_pairs && alias_pairs->iterate (i, &p);) |
85ce9375 | 1409 | { |
3dafb85c | 1410 | symtab_node *target_node = symtab_node::get_for_asmname (p->target); |
38e55ac9 | 1411 | |
4f219961 EB |
1412 | /* Weakrefs with target not defined in current unit are easy to handle: |
1413 | they behave just as external variables except we need to note the | |
1414 | alias flag to later output the weakref pseudo op into asm file. */ | |
1415 | if (!target_node | |
1416 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)) != NULL) | |
25e2c40d | 1417 | { |
d52f5295 | 1418 | symtab_node *node = symtab_node::get (p->decl); |
40a7fe1e | 1419 | if (node) |
e01c7cca | 1420 | { |
67348ccc DM |
1421 | node->alias_target = p->target; |
1422 | node->weakref = true; | |
1423 | node->alias = true; | |
71e54687 | 1424 | node->transparent_alias = true; |
e01c7cca | 1425 | } |
9771b263 | 1426 | alias_pairs->unordered_remove (i); |
38e55ac9 | 1427 | continue; |
25e2c40d | 1428 | } |
38e55ac9 | 1429 | else if (!target_node) |
85ce9375 | 1430 | { |
38e55ac9 | 1431 | error ("%q+D aliased to undefined symbol %qE", p->decl, p->target); |
d52f5295 | 1432 | symtab_node *node = symtab_node::get (p->decl); |
4f219961 | 1433 | if (node) |
67348ccc | 1434 | node->alias = false; |
9771b263 | 1435 | alias_pairs->unordered_remove (i); |
38e55ac9 JH |
1436 | continue; |
1437 | } | |
1438 | ||
67348ccc | 1439 | if (DECL_EXTERNAL (target_node->decl) |
07250f0e JH |
1440 | /* We use local aliases for C++ thunks to force the tailcall |
1441 | to bind locally. This is a hack - to keep it working do | |
1442 | the following (which is not strictly correct). */ | |
abbb94e6 | 1443 | && (TREE_CODE (target_node->decl) != FUNCTION_DECL |
67348ccc | 1444 | || ! DECL_VIRTUAL_P (target_node->decl)) |
07250f0e JH |
1445 | && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl))) |
1446 | { | |
1447 | error ("%q+D aliased to external symbol %qE", | |
1448 | p->decl, p->target); | |
1449 | } | |
1450 | ||
38e55ac9 | 1451 | if (TREE_CODE (p->decl) == FUNCTION_DECL |
7de90a6c | 1452 | && target_node && is_a <cgraph_node *> (target_node)) |
38e55ac9 | 1453 | { |
7a866e7e | 1454 | maybe_diag_incompatible_alias (p->decl, target_node->decl); |
e32d2388 | 1455 | |
79a2c428 MS |
1456 | maybe_diag_alias_attributes (p->decl, target_node->decl); |
1457 | ||
3dafb85c | 1458 | cgraph_node *src_node = cgraph_node::get (p->decl); |
67348ccc | 1459 | if (src_node && src_node->definition) |
d52f5295 ML |
1460 | src_node->reset (); |
1461 | cgraph_node::create_alias (p->decl, target_node->decl); | |
9771b263 | 1462 | alias_pairs->unordered_remove (i); |
38e55ac9 | 1463 | } |
8813a647 | 1464 | else if (VAR_P (p->decl) |
7de90a6c | 1465 | && target_node && is_a <varpool_node *> (target_node)) |
38e55ac9 | 1466 | { |
9041d2e6 | 1467 | varpool_node::create_alias (p->decl, target_node->decl); |
9771b263 | 1468 | alias_pairs->unordered_remove (i); |
38e55ac9 JH |
1469 | } |
1470 | else | |
1471 | { | |
e32d2388 | 1472 | error ("%q+D alias between function and variable is not supported", |
38e55ac9 | 1473 | p->decl); |
e32d2388 MS |
1474 | inform (DECL_SOURCE_LOCATION (target_node->decl), |
1475 | "aliased declaration here"); | |
1476 | ||
9771b263 | 1477 | alias_pairs->unordered_remove (i); |
85ce9375 JH |
1478 | } |
1479 | } | |
9771b263 | 1480 | vec_free (alias_pairs); |
85ce9375 JH |
1481 | } |
1482 | ||
5f1a9ebb | 1483 | |
1c4a429a JH |
1484 | /* Figure out what functions we want to assemble. */ |
1485 | ||
1486 | static void | |
65d630d4 | 1487 | mark_functions_to_output (void) |
1c4a429a | 1488 | { |
b66887e4 | 1489 | bool check_same_comdat_groups = false; |
b2b29377 | 1490 | cgraph_node *node; |
b66887e4 | 1491 | |
b2b29377 MM |
1492 | if (flag_checking) |
1493 | FOR_EACH_FUNCTION (node) | |
1494 | gcc_assert (!node->process); | |
1c4a429a | 1495 | |
65c70e6b | 1496 | FOR_EACH_FUNCTION (node) |
1c4a429a | 1497 | { |
67348ccc | 1498 | tree decl = node->decl; |
c22cacf3 | 1499 | |
67348ccc | 1500 | gcc_assert (!node->process || node->same_comdat_group); |
b66887e4 JJ |
1501 | if (node->process) |
1502 | continue; | |
b58b1157 | 1503 | |
7660e67e SB |
1504 | /* We need to output all local functions that are used and not |
1505 | always inlined, as well as those that are reachable from | |
1506 | outside the current compilation unit. */ | |
67348ccc | 1507 | if (node->analyzed |
c47d0034 | 1508 | && !node->thunk.thunk_p |
67348ccc | 1509 | && !node->alias |
18c6ada9 | 1510 | && !node->global.inlined_to |
6de9cd9a | 1511 | && !TREE_ASM_WRITTEN (decl) |
1c4a429a | 1512 | && !DECL_EXTERNAL (decl)) |
b66887e4 JJ |
1513 | { |
1514 | node->process = 1; | |
67348ccc | 1515 | if (node->same_comdat_group) |
b66887e4 | 1516 | { |
3dafb85c | 1517 | cgraph_node *next; |
d52f5295 | 1518 | for (next = dyn_cast<cgraph_node *> (node->same_comdat_group); |
b66887e4 | 1519 | next != node; |
d52f5295 | 1520 | next = dyn_cast<cgraph_node *> (next->same_comdat_group)) |
1f26ac87 | 1521 | if (!next->thunk.thunk_p && !next->alias |
d52f5295 | 1522 | && !next->comdat_local_p ()) |
c47d0034 | 1523 | next->process = 1; |
b66887e4 JJ |
1524 | } |
1525 | } | |
67348ccc | 1526 | else if (node->same_comdat_group) |
b66887e4 | 1527 | { |
b2b29377 MM |
1528 | if (flag_checking) |
1529 | check_same_comdat_groups = true; | |
b66887e4 | 1530 | } |
341c100f | 1531 | else |
1a2caa7a NS |
1532 | { |
1533 | /* We should've reclaimed all functions that are not needed. */ | |
b2b29377 MM |
1534 | if (flag_checking |
1535 | && !node->global.inlined_to | |
39ecc018 | 1536 | && gimple_has_body_p (decl) |
a837268b JH |
1537 | /* FIXME: in ltrans unit when offline copy is outside partition but inline copies |
1538 | are inside partition, we can end up not removing the body since we no longer | |
1539 | have analyzed node pointing to it. */ | |
67348ccc DM |
1540 | && !node->in_other_partition |
1541 | && !node->alias | |
387df871 | 1542 | && !node->clones |
1a2caa7a NS |
1543 | && !DECL_EXTERNAL (decl)) |
1544 | { | |
d52f5295 | 1545 | node->debug (); |
1a2caa7a NS |
1546 | internal_error ("failed to reclaim unneeded function"); |
1547 | } | |
726a989a | 1548 | gcc_assert (node->global.inlined_to |
39ecc018 | 1549 | || !gimple_has_body_p (decl) |
67348ccc | 1550 | || node->in_other_partition |
6649df51 JH |
1551 | || node->clones |
1552 | || DECL_ARTIFICIAL (decl) | |
1a2caa7a NS |
1553 | || DECL_EXTERNAL (decl)); |
1554 | ||
1555 | } | |
c22cacf3 | 1556 | |
18d13f34 | 1557 | } |
b2b29377 | 1558 | if (flag_checking && check_same_comdat_groups) |
65c70e6b | 1559 | FOR_EACH_FUNCTION (node) |
67348ccc | 1560 | if (node->same_comdat_group && !node->process) |
b66887e4 | 1561 | { |
67348ccc | 1562 | tree decl = node->decl; |
b66887e4 JJ |
1563 | if (!node->global.inlined_to |
1564 | && gimple_has_body_p (decl) | |
7cbf224d RG |
1565 | /* FIXME: in an ltrans unit when the offline copy is outside a |
1566 | partition but inline copies are inside a partition, we can | |
1567 | end up not removing the body since we no longer have an | |
1568 | analyzed node pointing to it. */ | |
67348ccc | 1569 | && !node->in_other_partition |
07250f0e | 1570 | && !node->clones |
b66887e4 JJ |
1571 | && !DECL_EXTERNAL (decl)) |
1572 | { | |
d52f5295 | 1573 | node->debug (); |
7cbf224d RG |
1574 | internal_error ("failed to reclaim unneeded function in same " |
1575 | "comdat group"); | |
b66887e4 JJ |
1576 | } |
1577 | } | |
18d13f34 JH |
1578 | } |
1579 | ||
6744a6ab | 1580 | /* DECL is FUNCTION_DECL. Initialize datastructures so DECL is a function |
3649b9b7 | 1581 | in lowered gimple form. IN_SSA is true if the gimple is in SSA. |
6744a6ab JH |
1582 | |
1583 | Set current_function_decl and cfun to newly constructed empty function body. | |
1584 | return basic block in the function body. */ | |
1585 | ||
3649b9b7 | 1586 | basic_block |
3995f3a2 | 1587 | init_lowered_empty_function (tree decl, bool in_ssa, profile_count count) |
6744a6ab JH |
1588 | { |
1589 | basic_block bb; | |
10881cff | 1590 | edge e; |
6744a6ab JH |
1591 | |
1592 | current_function_decl = decl; | |
1593 | allocate_struct_function (decl, false); | |
1594 | gimple_register_cfg_hooks (); | |
1595 | init_empty_tree_cfg (); | |
381cdae4 | 1596 | init_tree_ssa (cfun); |
3649b9b7 ST |
1597 | |
1598 | if (in_ssa) | |
1599 | { | |
3649b9b7 ST |
1600 | init_ssa_operands (cfun); |
1601 | cfun->gimple_df->in_ssa_p = true; | |
31ee20ba | 1602 | cfun->curr_properties |= PROP_ssa; |
3649b9b7 ST |
1603 | } |
1604 | ||
6744a6ab | 1605 | DECL_INITIAL (decl) = make_node (BLOCK); |
01771d43 | 1606 | BLOCK_SUPERCONTEXT (DECL_INITIAL (decl)) = decl; |
6744a6ab JH |
1607 | |
1608 | DECL_SAVED_TREE (decl) = error_mark_node; | |
31ee20ba RB |
1609 | cfun->curr_properties |= (PROP_gimple_lcf | PROP_gimple_leh | PROP_gimple_any |
1610 | | PROP_cfg | PROP_loops); | |
1611 | ||
766090c2 | 1612 | set_loops_for_fn (cfun, ggc_cleared_alloc<loops> ()); |
31ee20ba RB |
1613 | init_loops_structure (cfun, loops_for_fn (cfun), 1); |
1614 | loops_for_fn (cfun)->state |= LOOPS_MAY_HAVE_MULTIPLE_LATCHES; | |
6744a6ab JH |
1615 | |
1616 | /* Create BB for body of the function and connect it properly. */ | |
10881cff | 1617 | ENTRY_BLOCK_PTR_FOR_FN (cfun)->count = count; |
10881cff | 1618 | EXIT_BLOCK_PTR_FOR_FN (cfun)->count = count; |
c4d281b2 | 1619 | bb = create_basic_block (NULL, ENTRY_BLOCK_PTR_FOR_FN (cfun)); |
10881cff | 1620 | bb->count = count; |
10881cff | 1621 | e = make_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun), bb, EDGE_FALLTHRU); |
357067f2 | 1622 | e->probability = profile_probability::always (); |
10881cff | 1623 | e = make_edge (bb, EXIT_BLOCK_PTR_FOR_FN (cfun), 0); |
357067f2 | 1624 | e->probability = profile_probability::always (); |
fefa31b5 | 1625 | add_bb_to_loop (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun)->loop_father); |
6744a6ab JH |
1626 | |
1627 | return bb; | |
1628 | } | |
1629 | ||
44662f68 EB |
1630 | /* Adjust PTR by the constant FIXED_OFFSET, by the vtable offset indicated by |
1631 | VIRTUAL_OFFSET, and by the indirect offset indicated by INDIRECT_OFFSET, if | |
1632 | it is non-null. THIS_ADJUSTING is nonzero for a this adjusting thunk and zero | |
1633 | for a result adjusting thunk. */ | |
6744a6ab | 1634 | |
6bbf39b7 | 1635 | tree |
6744a6ab JH |
1636 | thunk_adjust (gimple_stmt_iterator * bsi, |
1637 | tree ptr, bool this_adjusting, | |
44662f68 EB |
1638 | HOST_WIDE_INT fixed_offset, tree virtual_offset, |
1639 | HOST_WIDE_INT indirect_offset) | |
6744a6ab | 1640 | { |
538dd0b7 | 1641 | gassign *stmt; |
6744a6ab JH |
1642 | tree ret; |
1643 | ||
313333a6 RG |
1644 | if (this_adjusting |
1645 | && fixed_offset != 0) | |
6744a6ab | 1646 | { |
5d49b6a7 RG |
1647 | stmt = gimple_build_assign |
1648 | (ptr, fold_build_pointer_plus_hwi_loc (input_location, | |
1649 | ptr, | |
1650 | fixed_offset)); | |
6744a6ab JH |
1651 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1652 | } | |
1653 | ||
44662f68 EB |
1654 | if (!vtable_entry_type && (virtual_offset || indirect_offset != 0)) |
1655 | { | |
1656 | tree vfunc_type = make_node (FUNCTION_TYPE); | |
1657 | TREE_TYPE (vfunc_type) = integer_type_node; | |
1658 | TYPE_ARG_TYPES (vfunc_type) = NULL_TREE; | |
1659 | layout_type (vfunc_type); | |
1660 | ||
1661 | vtable_entry_type = build_pointer_type (vfunc_type); | |
1662 | } | |
1663 | ||
6744a6ab JH |
1664 | /* If there's a virtual offset, look up that value in the vtable and |
1665 | adjust the pointer again. */ | |
1666 | if (virtual_offset) | |
1667 | { | |
1668 | tree vtabletmp; | |
1669 | tree vtabletmp2; | |
1670 | tree vtabletmp3; | |
6744a6ab | 1671 | |
6744a6ab | 1672 | vtabletmp = |
7cc434a3 | 1673 | create_tmp_reg (build_pointer_type |
7d80ca1f | 1674 | (build_pointer_type (vtable_entry_type)), "vptr"); |
6744a6ab JH |
1675 | |
1676 | /* The vptr is always at offset zero in the object. */ | |
1677 | stmt = gimple_build_assign (vtabletmp, | |
1678 | build1 (NOP_EXPR, TREE_TYPE (vtabletmp), | |
1679 | ptr)); | |
1680 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
6744a6ab JH |
1681 | |
1682 | /* Form the vtable address. */ | |
7cc434a3 | 1683 | vtabletmp2 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp)), |
7d80ca1f | 1684 | "vtableaddr"); |
6744a6ab | 1685 | stmt = gimple_build_assign (vtabletmp2, |
70f34814 | 1686 | build_simple_mem_ref (vtabletmp)); |
6744a6ab | 1687 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
6744a6ab JH |
1688 | |
1689 | /* Find the entry with the vcall offset. */ | |
1690 | stmt = gimple_build_assign (vtabletmp2, | |
5d49b6a7 RG |
1691 | fold_build_pointer_plus_loc (input_location, |
1692 | vtabletmp2, | |
1693 | virtual_offset)); | |
6744a6ab JH |
1694 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1695 | ||
1696 | /* Get the offset itself. */ | |
7cc434a3 | 1697 | vtabletmp3 = create_tmp_reg (TREE_TYPE (TREE_TYPE (vtabletmp2)), |
7d80ca1f | 1698 | "vcalloffset"); |
6744a6ab | 1699 | stmt = gimple_build_assign (vtabletmp3, |
70f34814 | 1700 | build_simple_mem_ref (vtabletmp2)); |
6744a6ab | 1701 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
6744a6ab | 1702 | |
6744a6ab | 1703 | /* Adjust the `this' pointer. */ |
0d82a1c8 RG |
1704 | ptr = fold_build_pointer_plus_loc (input_location, ptr, vtabletmp3); |
1705 | ptr = force_gimple_operand_gsi (bsi, ptr, true, NULL_TREE, false, | |
1706 | GSI_CONTINUE_LINKING); | |
6744a6ab JH |
1707 | } |
1708 | ||
44662f68 EB |
1709 | /* Likewise for an offset that is stored in the object that contains the |
1710 | vtable. */ | |
1711 | if (indirect_offset != 0) | |
1712 | { | |
1713 | tree offset_ptr, offset_tree; | |
1714 | ||
1715 | /* Get the address of the offset. */ | |
1716 | offset_ptr | |
1717 | = create_tmp_reg (build_pointer_type | |
1718 | (build_pointer_type (vtable_entry_type)), | |
1719 | "offset_ptr"); | |
1720 | stmt = gimple_build_assign (offset_ptr, | |
1721 | build1 (NOP_EXPR, TREE_TYPE (offset_ptr), | |
1722 | ptr)); | |
1723 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1724 | ||
1725 | stmt = gimple_build_assign | |
1726 | (offset_ptr, | |
1727 | fold_build_pointer_plus_hwi_loc (input_location, offset_ptr, | |
1728 | indirect_offset)); | |
1729 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1730 | ||
1731 | /* Get the offset itself. */ | |
1732 | offset_tree = create_tmp_reg (TREE_TYPE (TREE_TYPE (offset_ptr)), | |
1733 | "offset"); | |
1734 | stmt = gimple_build_assign (offset_tree, | |
1735 | build_simple_mem_ref (offset_ptr)); | |
1736 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
1737 | ||
1738 | /* Adjust the `this' pointer. */ | |
1739 | ptr = fold_build_pointer_plus_loc (input_location, ptr, offset_tree); | |
1740 | ptr = force_gimple_operand_gsi (bsi, ptr, true, NULL_TREE, false, | |
1741 | GSI_CONTINUE_LINKING); | |
1742 | } | |
1743 | ||
313333a6 RG |
1744 | if (!this_adjusting |
1745 | && fixed_offset != 0) | |
6744a6ab JH |
1746 | /* Adjust the pointer by the constant. */ |
1747 | { | |
1748 | tree ptrtmp; | |
1749 | ||
8813a647 | 1750 | if (VAR_P (ptr)) |
6744a6ab JH |
1751 | ptrtmp = ptr; |
1752 | else | |
1753 | { | |
7cc434a3 | 1754 | ptrtmp = create_tmp_reg (TREE_TYPE (ptr), "ptr"); |
6744a6ab JH |
1755 | stmt = gimple_build_assign (ptrtmp, ptr); |
1756 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); | |
6744a6ab | 1757 | } |
5d49b6a7 RG |
1758 | ptr = fold_build_pointer_plus_hwi_loc (input_location, |
1759 | ptrtmp, fixed_offset); | |
6744a6ab JH |
1760 | } |
1761 | ||
1762 | /* Emit the statement and gimplify the adjustment expression. */ | |
7cc434a3 | 1763 | ret = create_tmp_reg (TREE_TYPE (ptr), "adjusted_this"); |
6744a6ab | 1764 | stmt = gimple_build_assign (ret, ptr); |
6744a6ab JH |
1765 | gsi_insert_after (bsi, stmt, GSI_NEW_STMT); |
1766 | ||
1767 | return ret; | |
1768 | } | |
1769 | ||
afdec9bd | 1770 | /* Expand thunk NODE to gimple if possible. |
d211e471 ML |
1771 | When FORCE_GIMPLE_THUNK is true, gimple thunk is created and |
1772 | no assembler is produced. | |
afdec9bd JH |
1773 | When OUTPUT_ASM_THUNK is true, also produce assembler for |
1774 | thunks that are not lowered. */ | |
6744a6ab | 1775 | |
afdec9bd | 1776 | bool |
d52f5295 | 1777 | cgraph_node::expand_thunk (bool output_asm_thunks, bool force_gimple_thunk) |
6744a6ab | 1778 | { |
d52f5295 ML |
1779 | bool this_adjusting = thunk.this_adjusting; |
1780 | HOST_WIDE_INT fixed_offset = thunk.fixed_offset; | |
1781 | HOST_WIDE_INT virtual_value = thunk.virtual_value; | |
44662f68 | 1782 | HOST_WIDE_INT indirect_offset = thunk.indirect_offset; |
6744a6ab | 1783 | tree virtual_offset = NULL; |
d52f5295 ML |
1784 | tree alias = callees->callee->decl; |
1785 | tree thunk_fndecl = decl; | |
bcb650cb JH |
1786 | tree a; |
1787 | ||
44662f68 EB |
1788 | if (!force_gimple_thunk |
1789 | && this_adjusting | |
1790 | && indirect_offset == 0 | |
1791 | && !DECL_EXTERNAL (alias) | |
1792 | && !DECL_STATIC_CHAIN (alias) | |
6744a6ab JH |
1793 | && targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset, |
1794 | virtual_value, alias)) | |
1795 | { | |
6744a6ab | 1796 | tree fn_block; |
4399cf59 | 1797 | tree restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); |
afdec9bd JH |
1798 | |
1799 | if (!output_asm_thunks) | |
77b7d74b MJ |
1800 | { |
1801 | analyzed = true; | |
1802 | return false; | |
1803 | } | |
afdec9bd JH |
1804 | |
1805 | if (in_lto_p) | |
70486010 | 1806 | get_untransformed_body (); |
afdec9bd | 1807 | a = DECL_ARGUMENTS (thunk_fndecl); |
6744a6ab | 1808 | |
afdec9bd JH |
1809 | current_function_decl = thunk_fndecl; |
1810 | ||
1811 | /* Ensure thunks are emitted in their correct sections. */ | |
9641fab3 JH |
1812 | resolve_unique_section (thunk_fndecl, 0, |
1813 | flag_function_sections); | |
afdec9bd | 1814 | |
6744a6ab JH |
1815 | DECL_RESULT (thunk_fndecl) |
1816 | = build_decl (DECL_SOURCE_LOCATION (thunk_fndecl), | |
4399cf59 | 1817 | RESULT_DECL, 0, restype); |
afdec9bd | 1818 | DECL_CONTEXT (DECL_RESULT (thunk_fndecl)) = thunk_fndecl; |
6744a6ab JH |
1819 | |
1820 | /* The back end expects DECL_INITIAL to contain a BLOCK, so we | |
1821 | create one. */ | |
1822 | fn_block = make_node (BLOCK); | |
1823 | BLOCK_VARS (fn_block) = a; | |
1824 | DECL_INITIAL (thunk_fndecl) = fn_block; | |
01771d43 | 1825 | BLOCK_SUPERCONTEXT (fn_block) = thunk_fndecl; |
be373510 | 1826 | allocate_struct_function (thunk_fndecl, false); |
6744a6ab JH |
1827 | init_function_start (thunk_fndecl); |
1828 | cfun->is_thunk = 1; | |
68a55980 JJ |
1829 | insn_locations_init (); |
1830 | set_curr_insn_location (DECL_SOURCE_LOCATION (thunk_fndecl)); | |
1831 | prologue_location = curr_insn_location (); | |
6744a6ab JH |
1832 | |
1833 | targetm.asm_out.output_mi_thunk (asm_out_file, thunk_fndecl, | |
1834 | fixed_offset, virtual_value, alias); | |
1835 | ||
68a55980 | 1836 | insn_locations_finalize (); |
6744a6ab JH |
1837 | init_insn_lengths (); |
1838 | free_after_compilation (cfun); | |
6744a6ab | 1839 | TREE_ASM_WRITTEN (thunk_fndecl) = 1; |
d52f5295 ML |
1840 | thunk.thunk_p = false; |
1841 | analyzed = false; | |
6744a6ab | 1842 | } |
d90cae08 JH |
1843 | else if (stdarg_p (TREE_TYPE (thunk_fndecl))) |
1844 | { | |
1845 | error ("generic thunk code fails for method %qD which uses %<...%>", | |
1846 | thunk_fndecl); | |
1847 | TREE_ASM_WRITTEN (thunk_fndecl) = 1; | |
1848 | analyzed = true; | |
1849 | return false; | |
1850 | } | |
6744a6ab JH |
1851 | else |
1852 | { | |
1853 | tree restype; | |
1854 | basic_block bb, then_bb, else_bb, return_bb; | |
1855 | gimple_stmt_iterator bsi; | |
1856 | int nargs = 0; | |
1857 | tree arg; | |
1858 | int i; | |
1859 | tree resdecl; | |
1860 | tree restmp = NULL; | |
6744a6ab | 1861 | |
538dd0b7 DM |
1862 | gcall *call; |
1863 | greturn *ret; | |
c43ade80 | 1864 | bool alias_is_noreturn = TREE_THIS_VOLATILE (alias); |
6744a6ab | 1865 | |
e9191ad3 JH |
1866 | /* We may be called from expand_thunk that releses body except for |
1867 | DECL_ARGUMENTS. In this case force_gimple_thunk is true. */ | |
1868 | if (in_lto_p && !force_gimple_thunk) | |
70486010 | 1869 | get_untransformed_body (); |
a1a0e08d EB |
1870 | |
1871 | /* We need to force DECL_IGNORED_P when the thunk is created | |
1872 | after early debug was run. */ | |
1873 | if (force_gimple_thunk) | |
1874 | DECL_IGNORED_P (thunk_fndecl) = 1; | |
1875 | ||
afdec9bd | 1876 | a = DECL_ARGUMENTS (thunk_fndecl); |
b84d4347 | 1877 | |
afdec9bd JH |
1878 | current_function_decl = thunk_fndecl; |
1879 | ||
1880 | /* Ensure thunks are emitted in their correct sections. */ | |
9641fab3 JH |
1881 | resolve_unique_section (thunk_fndecl, 0, |
1882 | flag_function_sections); | |
afdec9bd | 1883 | |
6744a6ab JH |
1884 | bitmap_obstack_initialize (NULL); |
1885 | ||
d52f5295 | 1886 | if (thunk.virtual_offset_p) |
6744a6ab JH |
1887 | virtual_offset = size_int (virtual_value); |
1888 | ||
1889 | /* Build the return declaration for the function. */ | |
1890 | restype = TREE_TYPE (TREE_TYPE (thunk_fndecl)); | |
1891 | if (DECL_RESULT (thunk_fndecl) == NULL_TREE) | |
1892 | { | |
1893 | resdecl = build_decl (input_location, RESULT_DECL, 0, restype); | |
1894 | DECL_ARTIFICIAL (resdecl) = 1; | |
1895 | DECL_IGNORED_P (resdecl) = 1; | |
44662f68 | 1896 | DECL_CONTEXT (resdecl) = thunk_fndecl; |
6744a6ab JH |
1897 | DECL_RESULT (thunk_fndecl) = resdecl; |
1898 | } | |
1899 | else | |
1900 | resdecl = DECL_RESULT (thunk_fndecl); | |
1901 | ||
e7a74006 JH |
1902 | profile_count cfg_count = count; |
1903 | if (!cfg_count.initialized_p ()) | |
1904 | cfg_count = profile_count::from_gcov_type (BB_FREQ_MAX).guessed_local (); | |
1905 | ||
10881cff | 1906 | bb = then_bb = else_bb = return_bb |
e7a74006 | 1907 | = init_lowered_empty_function (thunk_fndecl, true, cfg_count); |
6744a6ab JH |
1908 | |
1909 | bsi = gsi_start_bb (bb); | |
1910 | ||
1911 | /* Build call to the function being thunked. */ | |
e199dd0a | 1912 | if (!VOID_TYPE_P (restype) |
ab4c578f MP |
1913 | && (!alias_is_noreturn |
1914 | || TREE_ADDRESSABLE (restype) | |
1915 | || TREE_CODE (TYPE_SIZE_UNIT (restype)) != INTEGER_CST)) | |
6744a6ab | 1916 | { |
bc0ec027 | 1917 | if (DECL_BY_REFERENCE (resdecl)) |
8c14c817 ML |
1918 | { |
1919 | restmp = gimple_fold_indirect_ref (resdecl); | |
1920 | if (!restmp) | |
1921 | restmp = build2 (MEM_REF, | |
39791fb6 | 1922 | TREE_TYPE (TREE_TYPE (resdecl)), |
8c14c817 | 1923 | resdecl, |
39791fb6 | 1924 | build_int_cst (TREE_TYPE (resdecl), 0)); |
8c14c817 | 1925 | } |
bc0ec027 | 1926 | else if (!is_gimple_reg_type (restype)) |
6744a6ab | 1927 | { |
bbd1bae2 JJ |
1928 | if (aggregate_value_p (resdecl, TREE_TYPE (thunk_fndecl))) |
1929 | { | |
1930 | restmp = resdecl; | |
5cf18d25 | 1931 | |
8813a647 | 1932 | if (VAR_P (restmp)) |
44662f68 EB |
1933 | { |
1934 | add_local_decl (cfun, restmp); | |
1935 | BLOCK_VARS (DECL_INITIAL (current_function_decl)) | |
1936 | = restmp; | |
1937 | } | |
bbd1bae2 JJ |
1938 | } |
1939 | else | |
1940 | restmp = create_tmp_var (restype, "retval"); | |
6744a6ab JH |
1941 | } |
1942 | else | |
7cc434a3 | 1943 | restmp = create_tmp_reg (restype, "retval"); |
6744a6ab JH |
1944 | } |
1945 | ||
910ad8de | 1946 | for (arg = a; arg; arg = DECL_CHAIN (arg)) |
6744a6ab | 1947 | nargs++; |
ef062b13 | 1948 | auto_vec<tree> vargs (nargs); |
4eaf52aa JJ |
1949 | i = 0; |
1950 | arg = a; | |
6744a6ab | 1951 | if (this_adjusting) |
4eaf52aa JJ |
1952 | { |
1953 | vargs.quick_push (thunk_adjust (&bsi, a, 1, fixed_offset, | |
44662f68 | 1954 | virtual_offset, indirect_offset)); |
4eaf52aa JJ |
1955 | arg = DECL_CHAIN (a); |
1956 | i = 1; | |
1957 | } | |
bc0ec027 JH |
1958 | |
1959 | if (nargs) | |
4eaf52aa | 1960 | for (; i < nargs; i++, arg = DECL_CHAIN (arg)) |
fc044323 JM |
1961 | { |
1962 | tree tmp = arg; | |
62f96a79 ML |
1963 | if (VECTOR_TYPE_P (TREE_TYPE (arg)) |
1964 | || TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE) | |
1965 | DECL_GIMPLE_REG_P (arg) = 1; | |
1966 | ||
fc044323 JM |
1967 | if (!is_gimple_val (arg)) |
1968 | { | |
1969 | tmp = create_tmp_reg (TYPE_MAIN_VARIANT | |
1970 | (TREE_TYPE (arg)), "arg"); | |
355fe088 | 1971 | gimple *stmt = gimple_build_assign (tmp, arg); |
fc044323 JM |
1972 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); |
1973 | } | |
1974 | vargs.quick_push (tmp); | |
1975 | } | |
6744a6ab | 1976 | call = gimple_build_call_vec (build_fold_addr_expr_loc (0, alias), vargs); |
d52f5295 | 1977 | callees->call_stmt = call; |
6744a6ab | 1978 | gimple_call_set_from_thunk (call, true); |
44662f68 EB |
1979 | if (DECL_STATIC_CHAIN (alias)) |
1980 | { | |
1981 | tree p = DECL_STRUCT_FUNCTION (alias)->static_chain_decl; | |
1982 | tree type = TREE_TYPE (p); | |
1983 | tree decl = build_decl (DECL_SOURCE_LOCATION (thunk_fndecl), | |
1984 | PARM_DECL, create_tmp_var_name ("CHAIN"), | |
1985 | type); | |
1986 | DECL_ARTIFICIAL (decl) = 1; | |
1987 | DECL_IGNORED_P (decl) = 1; | |
1988 | TREE_USED (decl) = 1; | |
1989 | DECL_CONTEXT (decl) = thunk_fndecl; | |
1990 | DECL_ARG_TYPE (decl) = type; | |
1991 | TREE_READONLY (decl) = 1; | |
1992 | ||
1993 | struct function *sf = DECL_STRUCT_FUNCTION (thunk_fndecl); | |
1994 | sf->static_chain_decl = decl; | |
1995 | ||
1996 | gimple_call_set_chain (call, decl); | |
1997 | } | |
b7aa4a3a JH |
1998 | |
1999 | /* Return slot optimization is always possible and in fact requred to | |
2000 | return values with DECL_BY_REFERENCE. */ | |
2001 | if (aggregate_value_p (resdecl, TREE_TYPE (thunk_fndecl)) | |
2002 | && (!is_gimple_reg_type (TREE_TYPE (resdecl)) | |
2003 | || DECL_BY_REFERENCE (resdecl))) | |
2004 | gimple_call_set_return_slot_opt (call, true); | |
2005 | ||
e199dd0a | 2006 | if (restmp) |
bc0ec027 JH |
2007 | { |
2008 | gimple_call_set_lhs (call, restmp); | |
2009 | gcc_assert (useless_type_conversion_p (TREE_TYPE (restmp), | |
2010 | TREE_TYPE (TREE_TYPE (alias)))); | |
2011 | } | |
6744a6ab | 2012 | gsi_insert_after (&bsi, call, GSI_NEW_STMT); |
c43ade80 | 2013 | if (!alias_is_noreturn) |
bc0ec027 JH |
2014 | { |
2015 | if (restmp && !this_adjusting | |
2016 | && (fixed_offset || virtual_offset)) | |
2017 | { | |
2018 | tree true_label = NULL_TREE; | |
6744a6ab | 2019 | |
bc0ec027 JH |
2020 | if (TREE_CODE (TREE_TYPE (restmp)) == POINTER_TYPE) |
2021 | { | |
355fe088 | 2022 | gimple *stmt; |
10881cff | 2023 | edge e; |
bc0ec027 JH |
2024 | /* If the return type is a pointer, we need to |
2025 | protect against NULL. We know there will be an | |
2026 | adjustment, because that's why we're emitting a | |
2027 | thunk. */ | |
c4d281b2 | 2028 | then_bb = create_basic_block (NULL, bb); |
e7a74006 | 2029 | then_bb->count = cfg_count - cfg_count.apply_scale (1, 16); |
c4d281b2 | 2030 | return_bb = create_basic_block (NULL, then_bb); |
e7a74006 | 2031 | return_bb->count = cfg_count; |
c4d281b2 | 2032 | else_bb = create_basic_block (NULL, else_bb); |
e7a74006 | 2033 | else_bb->count = cfg_count.apply_scale (1, 16); |
bc0ec027 JH |
2034 | add_bb_to_loop (then_bb, bb->loop_father); |
2035 | add_bb_to_loop (return_bb, bb->loop_father); | |
2036 | add_bb_to_loop (else_bb, bb->loop_father); | |
2037 | remove_edge (single_succ_edge (bb)); | |
2038 | true_label = gimple_block_label (then_bb); | |
2039 | stmt = gimple_build_cond (NE_EXPR, restmp, | |
2040 | build_zero_cst (TREE_TYPE (restmp)), | |
2041 | NULL_TREE, NULL_TREE); | |
2042 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
10881cff | 2043 | e = make_edge (bb, then_bb, EDGE_TRUE_VALUE); |
357067f2 JH |
2044 | e->probability = profile_probability::guessed_always () |
2045 | .apply_scale (1, 16); | |
10881cff | 2046 | e = make_edge (bb, else_bb, EDGE_FALSE_VALUE); |
357067f2 JH |
2047 | e->probability = profile_probability::guessed_always () |
2048 | .apply_scale (1, 16); | |
357067f2 JH |
2049 | make_single_succ_edge (return_bb, |
2050 | EXIT_BLOCK_PTR_FOR_FN (cfun), 0); | |
2051 | make_single_succ_edge (then_bb, return_bb, EDGE_FALLTHRU); | |
10881cff | 2052 | e = make_edge (else_bb, return_bb, EDGE_FALLTHRU); |
357067f2 | 2053 | e->probability = profile_probability::always (); |
bc0ec027 JH |
2054 | bsi = gsi_last_bb (then_bb); |
2055 | } | |
6744a6ab | 2056 | |
bc0ec027 | 2057 | restmp = thunk_adjust (&bsi, restmp, /*this_adjusting=*/0, |
44662f68 EB |
2058 | fixed_offset, virtual_offset, |
2059 | indirect_offset); | |
bc0ec027 JH |
2060 | if (true_label) |
2061 | { | |
355fe088 | 2062 | gimple *stmt; |
bc0ec027 JH |
2063 | bsi = gsi_last_bb (else_bb); |
2064 | stmt = gimple_build_assign (restmp, | |
2065 | build_zero_cst (TREE_TYPE (restmp))); | |
2066 | gsi_insert_after (&bsi, stmt, GSI_NEW_STMT); | |
2067 | bsi = gsi_last_bb (return_bb); | |
2068 | } | |
6744a6ab | 2069 | } |
bc0ec027 JH |
2070 | else |
2071 | gimple_call_set_tail (call, true); | |
6744a6ab | 2072 | |
bc0ec027 | 2073 | /* Build return value. */ |
8c14c817 ML |
2074 | if (!DECL_BY_REFERENCE (resdecl)) |
2075 | ret = gimple_build_return (restmp); | |
2076 | else | |
2077 | ret = gimple_build_return (resdecl); | |
2078 | ||
bc0ec027 | 2079 | gsi_insert_after (&bsi, ret, GSI_NEW_STMT); |
6744a6ab JH |
2080 | } |
2081 | else | |
bc0ec027 JH |
2082 | { |
2083 | gimple_call_set_tail (call, true); | |
2084 | remove_edge (single_succ_edge (bb)); | |
2085 | } | |
6744a6ab | 2086 | |
afdec9bd | 2087 | cfun->gimple_df->in_ssa_p = true; |
fc06ae0d | 2088 | update_max_bb_count (); |
10881cff | 2089 | profile_status_for_fn (cfun) |
e7a74006 JH |
2090 | = cfg_count.initialized_p () && cfg_count.ipa_p () |
2091 | ? PROFILE_READ : PROFILE_GUESSED; | |
afdec9bd JH |
2092 | /* FIXME: C++ FE should stop setting TREE_ASM_WRITTEN on thunks. */ |
2093 | TREE_ASM_WRITTEN (thunk_fndecl) = false; | |
6744a6ab JH |
2094 | delete_unreachable_blocks (); |
2095 | update_ssa (TODO_update_ssa); | |
b2b29377 | 2096 | checking_verify_flow_info (); |
253eab4f | 2097 | free_dominance_info (CDI_DOMINATORS); |
6744a6ab | 2098 | |
6744a6ab JH |
2099 | /* Since we want to emit the thunk, we explicitly mark its name as |
2100 | referenced. */ | |
d52f5295 ML |
2101 | thunk.thunk_p = false; |
2102 | lowered = true; | |
6744a6ab JH |
2103 | bitmap_obstack_release (NULL); |
2104 | } | |
2105 | current_function_decl = NULL; | |
af16bc76 | 2106 | set_cfun (NULL); |
afdec9bd | 2107 | return true; |
6744a6ab JH |
2108 | } |
2109 | ||
3dafb85c | 2110 | /* Assemble thunks and aliases associated to node. */ |
c47d0034 | 2111 | |
3dafb85c ML |
2112 | void |
2113 | cgraph_node::assemble_thunks_and_aliases (void) | |
c47d0034 | 2114 | { |
3dafb85c ML |
2115 | cgraph_edge *e; |
2116 | ipa_ref *ref; | |
39e2db00 | 2117 | |
3dafb85c | 2118 | for (e = callers; e;) |
d5e254e1 | 2119 | if (e->caller->thunk.thunk_p |
dbcdd561 | 2120 | && !e->caller->global.inlined_to) |
c47d0034 | 2121 | { |
3dafb85c | 2122 | cgraph_node *thunk = e->caller; |
c47d0034 JH |
2123 | |
2124 | e = e->next_caller; | |
d52f5295 | 2125 | thunk->expand_thunk (true, false); |
3dafb85c | 2126 | thunk->assemble_thunks_and_aliases (); |
c47d0034 JH |
2127 | } |
2128 | else | |
2129 | e = e->next_caller; | |
e55637b7 | 2130 | |
3dafb85c | 2131 | FOR_EACH_ALIAS (this, ref) |
e55637b7 | 2132 | { |
3dafb85c | 2133 | cgraph_node *alias = dyn_cast <cgraph_node *> (ref->referring); |
71e54687 JH |
2134 | if (!alias->transparent_alias) |
2135 | { | |
2136 | bool saved_written = TREE_ASM_WRITTEN (decl); | |
2137 | ||
2138 | /* Force assemble_alias to really output the alias this time instead | |
2139 | of buffering it in same alias pairs. */ | |
2140 | TREE_ASM_WRITTEN (decl) = 1; | |
2141 | do_assemble_alias (alias->decl, | |
2142 | DECL_ASSEMBLER_NAME (decl)); | |
2143 | alias->assemble_thunks_and_aliases (); | |
2144 | TREE_ASM_WRITTEN (decl) = saved_written; | |
2145 | } | |
e55637b7 | 2146 | } |
c47d0034 JH |
2147 | } |
2148 | ||
3dafb85c | 2149 | /* Expand function specified by node. */ |
0878843f | 2150 | |
3dafb85c ML |
2151 | void |
2152 | cgraph_node::expand (void) | |
0878843f | 2153 | { |
0878843f RG |
2154 | location_t saved_loc; |
2155 | ||
9c8305f8 | 2156 | /* We ought to not compile any inline clones. */ |
3dafb85c | 2157 | gcc_assert (!global.inlined_to); |
9c8305f8 | 2158 | |
c2e84327 DM |
2159 | /* __RTL functions are compiled as soon as they are parsed, so don't |
2160 | do it again. */ | |
2161 | if (native_rtl_p ()) | |
2162 | return; | |
2163 | ||
9c8305f8 | 2164 | announce_function (decl); |
3dafb85c ML |
2165 | process = 0; |
2166 | gcc_assert (lowered); | |
70486010 | 2167 | get_untransformed_body (); |
9c8305f8 JH |
2168 | |
2169 | /* Generate RTL for the body of DECL. */ | |
2170 | ||
0878843f RG |
2171 | timevar_push (TV_REST_OF_COMPILATION); |
2172 | ||
3dafb85c | 2173 | gcc_assert (symtab->global_info_ready); |
0878843f RG |
2174 | |
2175 | /* Initialize the default bitmap obstack. */ | |
2176 | bitmap_obstack_initialize (NULL); | |
2177 | ||
2178 | /* Initialize the RTL code for the function. */ | |
0878843f | 2179 | saved_loc = input_location; |
9c8305f8 | 2180 | input_location = DECL_SOURCE_LOCATION (decl); |
be373510 ML |
2181 | |
2182 | gcc_assert (DECL_STRUCT_FUNCTION (decl)); | |
2183 | push_cfun (DECL_STRUCT_FUNCTION (decl)); | |
9c8305f8 | 2184 | init_function_start (decl); |
0878843f RG |
2185 | |
2186 | gimple_register_cfg_hooks (); | |
2187 | ||
2188 | bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL generation*/ | |
2189 | ||
e57c896e | 2190 | execute_all_ipa_transforms (false); |
0878843f RG |
2191 | |
2192 | /* Perform all tree transforms and optimizations. */ | |
2193 | ||
2194 | /* Signal the start of passes. */ | |
2195 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_START, NULL); | |
2196 | ||
2cbf2d95 | 2197 | execute_pass_list (cfun, g->get_passes ()->all_passes); |
0878843f RG |
2198 | |
2199 | /* Signal the end of passes. */ | |
2200 | invoke_plugin_callbacks (PLUGIN_ALL_PASSES_END, NULL); | |
2201 | ||
2202 | bitmap_obstack_release (®_obstack); | |
2203 | ||
2204 | /* Release the default bitmap obstack. */ | |
2205 | bitmap_obstack_release (NULL); | |
2206 | ||
0878843f RG |
2207 | /* If requested, warn about function definitions where the function will |
2208 | return a value (usually of some struct or union type) which itself will | |
2209 | take up a lot of stack space. */ | |
00abf86c | 2210 | if (!DECL_EXTERNAL (decl) && TREE_TYPE (decl)) |
0878843f | 2211 | { |
9c8305f8 | 2212 | tree ret_type = TREE_TYPE (TREE_TYPE (decl)); |
0878843f RG |
2213 | |
2214 | if (ret_type && TYPE_SIZE_UNIT (ret_type) | |
2215 | && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST | |
01512446 | 2216 | && compare_tree_int (TYPE_SIZE_UNIT (ret_type), |
00abf86c | 2217 | warn_larger_than_size) > 0) |
0878843f RG |
2218 | { |
2219 | unsigned int size_as_int | |
2220 | = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type)); | |
2221 | ||
2222 | if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0) | |
00abf86c MS |
2223 | warning (OPT_Wlarger_than_, |
2224 | "size of return value of %q+D is %u bytes", | |
9c8305f8 | 2225 | decl, size_as_int); |
0878843f | 2226 | else |
00abf86c MS |
2227 | warning (OPT_Wlarger_than_, |
2228 | "size of return value of %q+D is larger than %wu bytes", | |
2229 | decl, warn_larger_than_size); | |
0878843f RG |
2230 | } |
2231 | } | |
2232 | ||
9c8305f8 JH |
2233 | gimple_set_body (decl, NULL); |
2234 | if (DECL_STRUCT_FUNCTION (decl) == 0 | |
d52f5295 | 2235 | && !cgraph_node::get (decl)->origin) |
0878843f RG |
2236 | { |
2237 | /* Stop pointing to the local nodes about to be freed. | |
2238 | But DECL_INITIAL must remain nonzero so we know this | |
2239 | was an actual function definition. | |
2240 | For a nested function, this is done in c_pop_function_context. | |
2241 | If rest_of_compilation set this to 0, leave it 0. */ | |
9c8305f8 JH |
2242 | if (DECL_INITIAL (decl) != 0) |
2243 | DECL_INITIAL (decl) = error_mark_node; | |
0878843f RG |
2244 | } |
2245 | ||
2246 | input_location = saved_loc; | |
2247 | ||
2248 | ggc_collect (); | |
2249 | timevar_pop (TV_REST_OF_COMPILATION); | |
5806d9ac JH |
2250 | |
2251 | /* Make sure that BE didn't give up on compiling. */ | |
2252 | gcc_assert (TREE_ASM_WRITTEN (decl)); | |
be373510 ML |
2253 | if (cfun) |
2254 | pop_cfun (); | |
1bb7e8f8 JH |
2255 | |
2256 | /* It would make a lot more sense to output thunks before function body to get more | |
65d630d4 | 2257 | forward and lest backwarding jumps. This however would need solving problem |
1bb7e8f8 | 2258 | with comdats. See PR48668. Also aliases must come after function itself to |
65d630d4 | 2259 | make one pass assemblers, like one on AIX, happy. See PR 50689. |
1bb7e8f8 JH |
2260 | FIXME: Perhaps thunks should be move before function IFF they are not in comdat |
2261 | groups. */ | |
3dafb85c ML |
2262 | assemble_thunks_and_aliases (); |
2263 | release_body (); | |
39ecc018 JH |
2264 | /* Eliminate all call edges. This is important so the GIMPLE_CALL no longer |
2265 | points to the dead function body. */ | |
3dafb85c ML |
2266 | remove_callees (); |
2267 | remove_all_references (); | |
1c4a429a JH |
2268 | } |
2269 | ||
9cec31f4 ML |
2270 | /* Node comparer that is responsible for the order that corresponds |
2271 | to time when a function was launched for the first time. */ | |
2272 | ||
2273 | static int | |
2274 | node_cmp (const void *pa, const void *pb) | |
2275 | { | |
3dafb85c ML |
2276 | const cgraph_node *a = *(const cgraph_node * const *) pa; |
2277 | const cgraph_node *b = *(const cgraph_node * const *) pb; | |
9cec31f4 ML |
2278 | |
2279 | /* Functions with time profile must be before these without profile. */ | |
2280 | if (!a->tp_first_run || !b->tp_first_run) | |
2281 | return a->tp_first_run - b->tp_first_run; | |
2282 | ||
2283 | return a->tp_first_run != b->tp_first_run | |
2284 | ? b->tp_first_run - a->tp_first_run | |
2285 | : b->order - a->order; | |
2286 | } | |
6674a6ce | 2287 | |
db0e878d AJ |
2288 | /* Expand all functions that must be output. |
2289 | ||
b58b1157 JH |
2290 | Attempt to topologically sort the nodes so function is output when |
2291 | all called functions are already assembled to allow data to be | |
a98ebe2e | 2292 | propagated across the callgraph. Use a stack to get smaller distance |
d1a6adeb | 2293 | between a function and its callees (later we may choose to use a more |
b58b1157 JH |
2294 | sophisticated algorithm for function reordering; we will likely want |
2295 | to use subsections to make the output functions appear in top-down | |
2296 | order). */ | |
2297 | ||
2298 | static void | |
65d630d4 | 2299 | expand_all_functions (void) |
b58b1157 | 2300 | { |
3dafb85c ML |
2301 | cgraph_node *node; |
2302 | cgraph_node **order = XCNEWVEC (cgraph_node *, | |
2303 | symtab->cgraph_count); | |
9cec31f4 | 2304 | unsigned int expanded_func_count = 0, profiled_func_count = 0; |
f30cfcb1 | 2305 | int order_pos, new_order_pos = 0; |
b58b1157 JH |
2306 | int i; |
2307 | ||
af8bca3c | 2308 | order_pos = ipa_reverse_postorder (order); |
3dafb85c | 2309 | gcc_assert (order_pos == symtab->cgraph_count); |
b58b1157 | 2310 | |
1ae58c30 | 2311 | /* Garbage collector may remove inline clones we eliminate during |
18c6ada9 JH |
2312 | optimization. So we must be sure to not reference them. */ |
2313 | for (i = 0; i < order_pos; i++) | |
257eb6e3 | 2314 | if (order[i]->process) |
18c6ada9 JH |
2315 | order[new_order_pos++] = order[i]; |
2316 | ||
9cec31f4 | 2317 | if (flag_profile_reorder_functions) |
3dafb85c | 2318 | qsort (order, new_order_pos, sizeof (cgraph_node *), node_cmp); |
9cec31f4 | 2319 | |
18c6ada9 | 2320 | for (i = new_order_pos - 1; i >= 0; i--) |
b58b1157 JH |
2321 | { |
2322 | node = order[i]; | |
9cec31f4 | 2323 | |
257eb6e3 | 2324 | if (node->process) |
b58b1157 | 2325 | { |
21c0a521 DM |
2326 | expanded_func_count++; |
2327 | if(node->tp_first_run) | |
2328 | profiled_func_count++; | |
2329 | ||
2330 | if (symtab->dump_file) | |
2331 | fprintf (symtab->dump_file, | |
2332 | "Time profile order in expand_all_functions:%s:%d\n", | |
2333 | node->asm_name (), node->tp_first_run); | |
257eb6e3 | 2334 | node->process = 0; |
3dafb85c | 2335 | node->expand (); |
b58b1157 JH |
2336 | } |
2337 | } | |
9cec31f4 ML |
2338 | |
2339 | if (dump_file) | |
2340 | fprintf (dump_file, "Expanded functions with time profile (%s):%u/%u\n", | |
2341 | main_input_filename, profiled_func_count, expanded_func_count); | |
2342 | ||
3dafb85c ML |
2343 | if (symtab->dump_file && flag_profile_reorder_functions) |
2344 | fprintf (symtab->dump_file, "Expanded functions with time profile:%u/%u\n", | |
9cec31f4 ML |
2345 | profiled_func_count, expanded_func_count); |
2346 | ||
3dafb85c | 2347 | symtab->process_new_functions (); |
45852dcc | 2348 | free_gimplify_stack (); |
50674e96 | 2349 | |
b58b1157 JH |
2350 | free (order); |
2351 | } | |
2352 | ||
474eccc6 ILT |
2353 | /* This is used to sort the node types by the cgraph order number. */ |
2354 | ||
24b97832 ILT |
2355 | enum cgraph_order_sort_kind |
2356 | { | |
2357 | ORDER_UNDEFINED = 0, | |
2358 | ORDER_FUNCTION, | |
2359 | ORDER_VAR, | |
3ef46782 | 2360 | ORDER_VAR_UNDEF, |
24b97832 ILT |
2361 | ORDER_ASM |
2362 | }; | |
2363 | ||
474eccc6 ILT |
2364 | struct cgraph_order_sort |
2365 | { | |
24b97832 | 2366 | enum cgraph_order_sort_kind kind; |
474eccc6 ILT |
2367 | union |
2368 | { | |
3dafb85c | 2369 | cgraph_node *f; |
2c8326a5 | 2370 | varpool_node *v; |
3dafb85c | 2371 | asm_node *a; |
474eccc6 ILT |
2372 | } u; |
2373 | }; | |
2374 | ||
2375 | /* Output all functions, variables, and asm statements in the order | |
2376 | according to their order fields, which is the order in which they | |
2377 | appeared in the file. This implements -fno-toplevel-reorder. In | |
2378 | this mode we may output functions and variables which don't really | |
0eaf0bfe | 2379 | need to be output. */ |
474eccc6 ILT |
2380 | |
2381 | static void | |
0eaf0bfe | 2382 | output_in_order (void) |
474eccc6 ILT |
2383 | { |
2384 | int max; | |
3dafb85c | 2385 | cgraph_order_sort *nodes; |
474eccc6 | 2386 | int i; |
3dafb85c | 2387 | cgraph_node *pf; |
2c8326a5 | 2388 | varpool_node *pv; |
3dafb85c ML |
2389 | asm_node *pa; |
2390 | max = symtab->order; | |
2391 | nodes = XCNEWVEC (cgraph_order_sort, max); | |
474eccc6 | 2392 | |
65c70e6b | 2393 | FOR_EACH_DEFINED_FUNCTION (pf) |
474eccc6 | 2394 | { |
67348ccc | 2395 | if (pf->process && !pf->thunk.thunk_p && !pf->alias) |
474eccc6 | 2396 | { |
0eaf0bfe | 2397 | if (!pf->no_reorder) |
7861b648 | 2398 | continue; |
67348ccc | 2399 | i = pf->order; |
474eccc6 ILT |
2400 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); |
2401 | nodes[i].kind = ORDER_FUNCTION; | |
2402 | nodes[i].u.f = pf; | |
2403 | } | |
2404 | } | |
2405 | ||
3ef46782 AM |
2406 | /* There is a similar loop in symbol_table::output_variables. |
2407 | Please keep them in sync. */ | |
2408 | FOR_EACH_VARIABLE (pv) | |
2409 | { | |
0eaf0bfe | 2410 | if (!pv->no_reorder) |
3ef46782 AM |
2411 | continue; |
2412 | if (DECL_HARD_REGISTER (pv->decl) | |
2413 | || DECL_HAS_VALUE_EXPR_P (pv->decl)) | |
2414 | continue; | |
2415 | i = pv->order; | |
2416 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
2417 | nodes[i].kind = pv->definition ? ORDER_VAR : ORDER_VAR_UNDEF; | |
2418 | nodes[i].u.v = pv; | |
2419 | } | |
474eccc6 | 2420 | |
3dafb85c | 2421 | for (pa = symtab->first_asm_symbol (); pa; pa = pa->next) |
474eccc6 ILT |
2422 | { |
2423 | i = pa->order; | |
2424 | gcc_assert (nodes[i].kind == ORDER_UNDEFINED); | |
2425 | nodes[i].kind = ORDER_ASM; | |
2426 | nodes[i].u.a = pa; | |
2427 | } | |
474eccc6 | 2428 | |
7386e3ee | 2429 | /* In toplevel reorder mode we output all statics; mark them as needed. */ |
7386e3ee | 2430 | |
7fece979 JJ |
2431 | for (i = 0; i < max; ++i) |
2432 | if (nodes[i].kind == ORDER_VAR) | |
9041d2e6 | 2433 | nodes[i].u.v->finalize_named_section_flags (); |
7fece979 | 2434 | |
474eccc6 ILT |
2435 | for (i = 0; i < max; ++i) |
2436 | { | |
2437 | switch (nodes[i].kind) | |
2438 | { | |
2439 | case ORDER_FUNCTION: | |
257eb6e3 | 2440 | nodes[i].u.f->process = 0; |
3dafb85c | 2441 | nodes[i].u.f->expand (); |
474eccc6 ILT |
2442 | break; |
2443 | ||
2444 | case ORDER_VAR: | |
9041d2e6 | 2445 | nodes[i].u.v->assemble_decl (); |
474eccc6 ILT |
2446 | break; |
2447 | ||
3ef46782 AM |
2448 | case ORDER_VAR_UNDEF: |
2449 | assemble_undefined_decl (nodes[i].u.v->decl); | |
2450 | break; | |
2451 | ||
474eccc6 ILT |
2452 | case ORDER_ASM: |
2453 | assemble_asm (nodes[i].u.a->asm_str); | |
2454 | break; | |
2455 | ||
2456 | case ORDER_UNDEFINED: | |
2457 | break; | |
2458 | ||
2459 | default: | |
2460 | gcc_unreachable (); | |
2461 | } | |
2462 | } | |
e7b9eb2c | 2463 | |
3dafb85c ML |
2464 | symtab->clear_asm_symbols (); |
2465 | ||
33283dad | 2466 | free (nodes); |
474eccc6 ILT |
2467 | } |
2468 | ||
ef330312 PB |
2469 | static void |
2470 | ipa_passes (void) | |
2471 | { | |
315f8c0e DM |
2472 | gcc::pass_manager *passes = g->get_passes (); |
2473 | ||
db2960f4 | 2474 | set_cfun (NULL); |
04b201a2 | 2475 | current_function_decl = NULL; |
726a989a | 2476 | gimple_register_cfg_hooks (); |
ef330312 | 2477 | bitmap_obstack_initialize (NULL); |
b20996ff | 2478 | |
090fa0ab GF |
2479 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_START, NULL); |
2480 | ||
b20996ff | 2481 | if (!in_lto_p) |
0430f80c | 2482 | { |
315f8c0e | 2483 | execute_ipa_pass_list (passes->all_small_ipa_passes); |
0430f80c RG |
2484 | if (seen_error ()) |
2485 | return; | |
2486 | } | |
3baf459d | 2487 | |
8605403e JH |
2488 | /* This extra symtab_remove_unreachable_nodes pass tends to catch some |
2489 | devirtualization and other changes where removal iterate. */ | |
17e0fc92 | 2490 | symtab->remove_unreachable_nodes (symtab->dump_file); |
467a8db0 | 2491 | |
d7f09764 DN |
2492 | /* If pass_all_early_optimizations was not scheduled, the state of |
2493 | the cgraph will not be properly updated. Update it now. */ | |
3dafb85c ML |
2494 | if (symtab->state < IPA_SSA) |
2495 | symtab->state = IPA_SSA; | |
3baf459d | 2496 | |
d7f09764 DN |
2497 | if (!in_lto_p) |
2498 | { | |
2499 | /* Generate coverage variables and constructors. */ | |
2500 | coverage_finish (); | |
2501 | ||
2502 | /* Process new functions added. */ | |
2503 | set_cfun (NULL); | |
2504 | current_function_decl = NULL; | |
3dafb85c | 2505 | symtab->process_new_functions (); |
d7f09764 | 2506 | |
090fa0ab | 2507 | execute_ipa_summary_passes |
6a5ac314 | 2508 | ((ipa_opt_pass_d *) passes->all_regular_ipa_passes); |
fb3f88cc | 2509 | } |
c082f9f3 SB |
2510 | |
2511 | /* Some targets need to handle LTO assembler output specially. */ | |
f0d78df9 | 2512 | if (flag_generate_lto || flag_generate_offload) |
c082f9f3 SB |
2513 | targetm.asm_out.lto_start (); |
2514 | ||
5b42d196 JH |
2515 | if (!in_lto_p |
2516 | || flag_incremental_link == INCREMENTAL_LINK_LTO) | |
1f6be682 | 2517 | { |
5b42d196 JH |
2518 | if (!quiet_flag) |
2519 | fprintf (stderr, "Streaming LTO\n"); | |
1f6be682 IV |
2520 | if (g->have_offload) |
2521 | { | |
2522 | section_name_prefix = OFFLOAD_SECTION_NAME_PREFIX; | |
1b34e6e2 | 2523 | lto_stream_offload_p = true; |
837bac8c | 2524 | ipa_write_summaries (); |
1b34e6e2 | 2525 | lto_stream_offload_p = false; |
1f6be682 IV |
2526 | } |
2527 | if (flag_lto) | |
2528 | { | |
2529 | section_name_prefix = LTO_SECTION_NAME_PREFIX; | |
1b34e6e2 | 2530 | lto_stream_offload_p = false; |
837bac8c | 2531 | ipa_write_summaries (); |
1f6be682 IV |
2532 | } |
2533 | } | |
d7f09764 | 2534 | |
f0d78df9 | 2535 | if (flag_generate_lto || flag_generate_offload) |
c082f9f3 SB |
2536 | targetm.asm_out.lto_end (); |
2537 | ||
5b42d196 JH |
2538 | if (!flag_ltrans |
2539 | && ((in_lto_p && flag_incremental_link != INCREMENTAL_LINK_LTO) | |
2540 | || !flag_lto || flag_fat_lto_objects)) | |
315f8c0e | 2541 | execute_ipa_pass_list (passes->all_regular_ipa_passes); |
090fa0ab | 2542 | invoke_plugin_callbacks (PLUGIN_ALL_IPA_PASSES_END, NULL); |
3baf459d | 2543 | |
ef330312 PB |
2544 | bitmap_obstack_release (NULL); |
2545 | } | |
2546 | ||
25e2c40d JH |
2547 | |
2548 | /* Return string alias is alias of. */ | |
2549 | ||
2550 | static tree | |
2551 | get_alias_symbol (tree decl) | |
2552 | { | |
2553 | tree alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); | |
2554 | return get_identifier (TREE_STRING_POINTER | |
2555 | (TREE_VALUE (TREE_VALUE (alias)))); | |
2556 | } | |
2557 | ||
2558 | ||
c9552bff | 2559 | /* Weakrefs may be associated to external decls and thus not output |
073a8998 | 2560 | at expansion time. Emit all necessary aliases. */ |
c9552bff | 2561 | |
3dafb85c ML |
2562 | void |
2563 | symbol_table::output_weakrefs (void) | |
c9552bff | 2564 | { |
5e20cdc9 | 2565 | symtab_node *node; |
40a7fe1e | 2566 | FOR_EACH_SYMBOL (node) |
67348ccc DM |
2567 | if (node->alias |
2568 | && !TREE_ASM_WRITTEN (node->decl) | |
2569 | && node->weakref) | |
40a7fe1e JH |
2570 | { |
2571 | tree target; | |
2572 | ||
2573 | /* Weakrefs are special by not requiring target definition in current | |
2574 | compilation unit. It is thus bit hard to work out what we want to | |
2575 | alias. | |
2576 | When alias target is defined, we need to fetch it from symtab reference, | |
2577 | otherwise it is pointed to by alias_target. */ | |
67348ccc DM |
2578 | if (node->alias_target) |
2579 | target = (DECL_P (node->alias_target) | |
2580 | ? DECL_ASSEMBLER_NAME (node->alias_target) | |
2581 | : node->alias_target); | |
2582 | else if (node->analyzed) | |
d52f5295 | 2583 | target = DECL_ASSEMBLER_NAME (node->get_alias_target ()->decl); |
40a7fe1e JH |
2584 | else |
2585 | { | |
2586 | gcc_unreachable (); | |
67348ccc | 2587 | target = get_alias_symbol (node->decl); |
40a7fe1e | 2588 | } |
67348ccc | 2589 | do_assemble_alias (node->decl, target); |
40a7fe1e | 2590 | } |
c9552bff JH |
2591 | } |
2592 | ||
711417cd RG |
2593 | /* Perform simple optimizations based on callgraph. */ |
2594 | ||
2595 | void | |
3dafb85c | 2596 | symbol_table::compile (void) |
711417cd RG |
2597 | { |
2598 | if (seen_error ()) | |
2599 | return; | |
2600 | ||
b2b29377 | 2601 | symtab_node::checking_verify_symtab_nodes (); |
711417cd | 2602 | |
711417cd RG |
2603 | timevar_push (TV_CGRAPHOPT); |
2604 | if (pre_ipa_mem_report) | |
2605 | { | |
2606 | fprintf (stderr, "Memory consumption before IPA\n"); | |
2607 | dump_memory_report (false); | |
2608 | } | |
2609 | if (!quiet_flag) | |
2610 | fprintf (stderr, "Performing interprocedural optimizations\n"); | |
3dafb85c | 2611 | state = IPA; |
711417cd | 2612 | |
65d630d4 | 2613 | /* If LTO is enabled, initialize the streamer hooks needed by GIMPLE. */ |
f0d78df9 | 2614 | if (flag_generate_lto || flag_generate_offload) |
65d630d4 JH |
2615 | lto_streamer_hooks_init (); |
2616 | ||
711417cd RG |
2617 | /* Don't run the IPA passes if there was any error or sorry messages. */ |
2618 | if (!seen_error ()) | |
856bb3ef GB |
2619 | { |
2620 | timevar_start (TV_CGRAPH_IPA_PASSES); | |
711417cd | 2621 | ipa_passes (); |
856bb3ef GB |
2622 | timevar_stop (TV_CGRAPH_IPA_PASSES); |
2623 | } | |
711417cd RG |
2624 | /* Do nothing else if any IPA pass found errors or if we are just streaming LTO. */ |
2625 | if (seen_error () | |
5b42d196 JH |
2626 | || ((!in_lto_p || flag_incremental_link == INCREMENTAL_LINK_LTO) |
2627 | && flag_lto && !flag_fat_lto_objects)) | |
711417cd RG |
2628 | { |
2629 | timevar_pop (TV_CGRAPHOPT); | |
2630 | return; | |
2631 | } | |
2632 | ||
3dafb85c ML |
2633 | global_info_ready = true; |
2634 | if (dump_file) | |
711417cd | 2635 | { |
3dafb85c | 2636 | fprintf (dump_file, "Optimized "); |
6c52831d | 2637 | symtab->dump (dump_file); |
711417cd RG |
2638 | } |
2639 | if (post_ipa_mem_report) | |
2640 | { | |
2641 | fprintf (stderr, "Memory consumption after IPA\n"); | |
2642 | dump_memory_report (false); | |
2643 | } | |
2644 | timevar_pop (TV_CGRAPHOPT); | |
2645 | ||
2646 | /* Output everything. */ | |
91a00d11 | 2647 | switch_to_section (text_section); |
711417cd RG |
2648 | (*debug_hooks->assembly_start) (); |
2649 | if (!quiet_flag) | |
2650 | fprintf (stderr, "Assembling functions:\n"); | |
b2b29377 | 2651 | symtab_node::checking_verify_symtab_nodes (); |
711417cd | 2652 | |
711417cd | 2653 | bitmap_obstack_initialize (NULL); |
315f8c0e | 2654 | execute_ipa_pass_list (g->get_passes ()->all_late_ipa_passes); |
711417cd | 2655 | bitmap_obstack_release (NULL); |
65d630d4 | 2656 | mark_functions_to_output (); |
711417cd | 2657 | |
5764ee3c | 2658 | /* When weakref support is missing, we automatically translate all |
38e55e5c JH |
2659 | references to NODE to references to its ultimate alias target. |
2660 | The renaming mechanizm uses flag IDENTIFIER_TRANSPARENT_ALIAS and | |
2661 | TREE_CHAIN. | |
2662 | ||
2663 | Set up this mapping before we output any assembler but once we are sure | |
2664 | that all symbol renaming is done. | |
2665 | ||
2666 | FIXME: All this uglyness can go away if we just do renaming at gimple | |
2667 | level by physically rewritting the IL. At the moment we can only redirect | |
2668 | calls, so we need infrastructure for renaming references as well. */ | |
2669 | #ifndef ASM_OUTPUT_WEAKREF | |
5e20cdc9 | 2670 | symtab_node *node; |
38e55e5c JH |
2671 | |
2672 | FOR_EACH_SYMBOL (node) | |
67348ccc DM |
2673 | if (node->alias |
2674 | && lookup_attribute ("weakref", DECL_ATTRIBUTES (node->decl))) | |
38e55e5c JH |
2675 | { |
2676 | IDENTIFIER_TRANSPARENT_ALIAS | |
67348ccc DM |
2677 | (DECL_ASSEMBLER_NAME (node->decl)) = 1; |
2678 | TREE_CHAIN (DECL_ASSEMBLER_NAME (node->decl)) | |
2679 | = (node->alias_target ? node->alias_target | |
dacd445e | 2680 | : DECL_ASSEMBLER_NAME (node->get_alias_target ()->decl)); |
38e55e5c JH |
2681 | } |
2682 | #endif | |
2683 | ||
3dafb85c | 2684 | state = EXPANSION; |
9cec31f4 | 2685 | |
0eaf0bfe JH |
2686 | /* Output first asm statements and anything ordered. The process |
2687 | flag is cleared for these nodes, so we skip them later. */ | |
2688 | output_in_order (); | |
856bb3ef GB |
2689 | |
2690 | timevar_start (TV_CGRAPH_FUNC_EXPANSION); | |
0eaf0bfe | 2691 | expand_all_functions (); |
856bb3ef GB |
2692 | timevar_stop (TV_CGRAPH_FUNC_EXPANSION); |
2693 | ||
0eaf0bfe | 2694 | output_variables (); |
711417cd | 2695 | |
3dafb85c ML |
2696 | process_new_functions (); |
2697 | state = FINISHED; | |
07250f0e | 2698 | output_weakrefs (); |
711417cd | 2699 | |
3dafb85c | 2700 | if (dump_file) |
711417cd | 2701 | { |
3dafb85c | 2702 | fprintf (dump_file, "\nFinal "); |
6c52831d | 2703 | symtab->dump (dump_file); |
711417cd | 2704 | } |
b2b29377 MM |
2705 | if (!flag_checking) |
2706 | return; | |
d52f5295 | 2707 | symtab_node::verify_symtab_nodes (); |
711417cd RG |
2708 | /* Double check that all inline clones are gone and that all |
2709 | function bodies have been released from memory. */ | |
2710 | if (!seen_error ()) | |
2711 | { | |
3dafb85c | 2712 | cgraph_node *node; |
711417cd RG |
2713 | bool error_found = false; |
2714 | ||
65c70e6b JH |
2715 | FOR_EACH_DEFINED_FUNCTION (node) |
2716 | if (node->global.inlined_to | |
67348ccc | 2717 | || gimple_has_body_p (node->decl)) |
711417cd RG |
2718 | { |
2719 | error_found = true; | |
d52f5295 | 2720 | node->debug (); |
711417cd RG |
2721 | } |
2722 | if (error_found) | |
2723 | internal_error ("nodes with unreleased memory found"); | |
2724 | } | |
711417cd RG |
2725 | } |
2726 | ||
efd9eb29 TV |
2727 | /* Earlydebug dump file, flags, and number. */ |
2728 | ||
2729 | static int debuginfo_early_dump_nr; | |
2730 | static FILE *debuginfo_early_dump_file; | |
2731 | static dump_flags_t debuginfo_early_dump_flags; | |
2732 | ||
2733 | /* Debug dump file, flags, and number. */ | |
2734 | ||
2735 | static int debuginfo_dump_nr; | |
2736 | static FILE *debuginfo_dump_file; | |
2737 | static dump_flags_t debuginfo_dump_flags; | |
2738 | ||
2739 | /* Register the debug and earlydebug dump files. */ | |
2740 | ||
2741 | void | |
2742 | debuginfo_early_init (void) | |
2743 | { | |
2744 | gcc::dump_manager *dumps = g->get_dumps (); | |
2745 | debuginfo_early_dump_nr = dumps->dump_register (".earlydebug", "earlydebug", | |
2746 | "earlydebug", DK_tree, | |
2747 | OPTGROUP_NONE, | |
2748 | false); | |
2749 | debuginfo_dump_nr = dumps->dump_register (".debug", "debug", | |
2750 | "debug", DK_tree, | |
2751 | OPTGROUP_NONE, | |
2752 | false); | |
2753 | } | |
2754 | ||
2755 | /* Initialize the debug and earlydebug dump files. */ | |
2756 | ||
2757 | void | |
2758 | debuginfo_init (void) | |
2759 | { | |
2760 | gcc::dump_manager *dumps = g->get_dumps (); | |
2761 | debuginfo_dump_file = dump_begin (debuginfo_dump_nr, NULL); | |
2762 | debuginfo_dump_flags = dumps->get_dump_file_info (debuginfo_dump_nr)->pflags; | |
2763 | debuginfo_early_dump_file = dump_begin (debuginfo_early_dump_nr, NULL); | |
2764 | debuginfo_early_dump_flags | |
2765 | = dumps->get_dump_file_info (debuginfo_early_dump_nr)->pflags; | |
2766 | } | |
2767 | ||
2768 | /* Finalize the debug and earlydebug dump files. */ | |
2769 | ||
2770 | void | |
2771 | debuginfo_fini (void) | |
2772 | { | |
2773 | if (debuginfo_dump_file) | |
2774 | dump_end (debuginfo_dump_nr, debuginfo_dump_file); | |
2775 | if (debuginfo_early_dump_file) | |
2776 | dump_end (debuginfo_early_dump_nr, debuginfo_early_dump_file); | |
2777 | } | |
2778 | ||
2779 | /* Set dump_file to the debug dump file. */ | |
2780 | ||
2781 | void | |
2782 | debuginfo_start (void) | |
2783 | { | |
2784 | set_dump_file (debuginfo_dump_file); | |
2785 | } | |
2786 | ||
2787 | /* Undo setting dump_file to the debug dump file. */ | |
2788 | ||
2789 | void | |
2790 | debuginfo_stop (void) | |
2791 | { | |
2792 | set_dump_file (NULL); | |
2793 | } | |
2794 | ||
2795 | /* Set dump_file to the earlydebug dump file. */ | |
2796 | ||
2797 | void | |
2798 | debuginfo_early_start (void) | |
2799 | { | |
2800 | set_dump_file (debuginfo_early_dump_file); | |
2801 | } | |
2802 | ||
2803 | /* Undo setting dump_file to the earlydebug dump file. */ | |
2804 | ||
2805 | void | |
2806 | debuginfo_early_stop (void) | |
2807 | { | |
2808 | set_dump_file (NULL); | |
2809 | } | |
711417cd RG |
2810 | |
2811 | /* Analyze the whole compilation unit once it is parsed completely. */ | |
2812 | ||
2813 | void | |
3dafb85c | 2814 | symbol_table::finalize_compilation_unit (void) |
711417cd RG |
2815 | { |
2816 | timevar_push (TV_CGRAPH); | |
2817 | ||
711417cd RG |
2818 | /* If we're here there's no current function anymore. Some frontends |
2819 | are lazy in clearing these. */ | |
2820 | current_function_decl = NULL; | |
2821 | set_cfun (NULL); | |
2822 | ||
2823 | /* Do not skip analyzing the functions if there were errors, we | |
2824 | miss diagnostics for following functions otherwise. */ | |
2825 | ||
2826 | /* Emit size functions we didn't inline. */ | |
2827 | finalize_size_functions (); | |
2828 | ||
2829 | /* Mark alias targets necessary and emit diagnostics. */ | |
711417cd RG |
2830 | handle_alias_pairs (); |
2831 | ||
2832 | if (!quiet_flag) | |
2833 | { | |
2834 | fprintf (stderr, "\nAnalyzing compilation unit\n"); | |
2835 | fflush (stderr); | |
2836 | } | |
2837 | ||
2838 | if (flag_dump_passes) | |
2839 | dump_passes (); | |
2840 | ||
2841 | /* Gimplify and lower all functions, compute reachability and | |
2842 | remove unreachable nodes. */ | |
d7438551 | 2843 | analyze_functions (/*first_time=*/true); |
711417cd RG |
2844 | |
2845 | /* Mark alias targets necessary and emit diagnostics. */ | |
711417cd RG |
2846 | handle_alias_pairs (); |
2847 | ||
2848 | /* Gimplify and lower thunks. */ | |
d7438551 AH |
2849 | analyze_functions (/*first_time=*/false); |
2850 | ||
5d52d2c9 RB |
2851 | /* Offloading requires LTO infrastructure. */ |
2852 | if (!in_lto_p && g->have_offload) | |
2853 | flag_generate_offload = 1; | |
2854 | ||
9ba01f82 RB |
2855 | if (!seen_error ()) |
2856 | { | |
2857 | /* Emit early debug for reachable functions, and by consequence, | |
2858 | locally scoped symbols. */ | |
2859 | struct cgraph_node *cnode; | |
2860 | FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (cnode) | |
2861 | (*debug_hooks->early_global_decl) (cnode->decl); | |
2862 | ||
2863 | /* Clean up anything that needs cleaning up after initial debug | |
2864 | generation. */ | |
efd9eb29 | 2865 | debuginfo_early_start (); |
68317985 | 2866 | (*debug_hooks->early_finish) (main_input_filename); |
efd9eb29 | 2867 | debuginfo_early_stop (); |
9ba01f82 RB |
2868 | } |
2869 | ||
711417cd | 2870 | /* Finally drive the pass manager. */ |
65d630d4 | 2871 | compile (); |
711417cd RG |
2872 | |
2873 | timevar_pop (TV_CGRAPH); | |
2874 | } | |
2875 | ||
3edf64aa DM |
2876 | /* Reset all state within cgraphunit.c so that we can rerun the compiler |
2877 | within the same process. For use by toplev::finalize. */ | |
2878 | ||
2879 | void | |
2880 | cgraphunit_c_finalize (void) | |
2881 | { | |
2882 | gcc_assert (cgraph_new_nodes.length () == 0); | |
2883 | cgraph_new_nodes.truncate (0); | |
2884 | ||
2885 | vtable_entry_type = NULL; | |
2886 | queued_nodes = &symtab_terminator; | |
2887 | ||
2888 | first_analyzed = NULL; | |
2889 | first_analyzed_var = NULL; | |
2890 | } | |
2891 | ||
d52f5295 | 2892 | /* Creates a wrapper from cgraph_node to TARGET node. Thunk is used for this |
8be2dc8c ML |
2893 | kind of wrapper method. */ |
2894 | ||
2895 | void | |
3dafb85c | 2896 | cgraph_node::create_wrapper (cgraph_node *target) |
8be2dc8c | 2897 | { |
3f9f4ae7 ML |
2898 | /* Preserve DECL_RESULT so we get right by reference flag. */ |
2899 | tree decl_result = DECL_RESULT (decl); | |
8be2dc8c | 2900 | |
3f9f4ae7 ML |
2901 | /* Remove the function's body but keep arguments to be reused |
2902 | for thunk. */ | |
2903 | release_body (true); | |
2904 | reset (); | |
8be2dc8c | 2905 | |
0a7246ee | 2906 | DECL_UNINLINABLE (decl) = false; |
3f9f4ae7 ML |
2907 | DECL_RESULT (decl) = decl_result; |
2908 | DECL_INITIAL (decl) = NULL; | |
2909 | allocate_struct_function (decl, false); | |
2910 | set_cfun (NULL); | |
8be2dc8c | 2911 | |
3f9f4ae7 ML |
2912 | /* Turn alias into thunk and expand it into GIMPLE representation. */ |
2913 | definition = true; | |
e68287df ML |
2914 | |
2915 | memset (&thunk, 0, sizeof (cgraph_thunk_info)); | |
3f9f4ae7 | 2916 | thunk.thunk_p = true; |
1bad9c18 | 2917 | create_edge (target, NULL, count); |
ce8bdcef | 2918 | callees->can_throw_external = !TREE_NOTHROW (target->decl); |
8be2dc8c | 2919 | |
3f9f4ae7 | 2920 | tree arguments = DECL_ARGUMENTS (decl); |
d862b343 | 2921 | |
3f9f4ae7 ML |
2922 | while (arguments) |
2923 | { | |
2924 | TREE_ADDRESSABLE (arguments) = false; | |
2925 | arguments = TREE_CHAIN (arguments); | |
2926 | } | |
d862b343 | 2927 | |
3f9f4ae7 | 2928 | expand_thunk (false, true); |
8be2dc8c | 2929 | |
3f9f4ae7 ML |
2930 | /* Inline summary set-up. */ |
2931 | analyze (); | |
2932 | inline_analyze_function (this); | |
8be2dc8c | 2933 | } |
711417cd | 2934 | |
7be82279 | 2935 | #include "gt-cgraphunit.h" |