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46e8c075 | 1 | /* Perform optimizations on tree structure. |
818ab71a | 2 | Copyright (C) 1998-2016 Free Software Foundation, Inc. |
46e8c075 MM |
3 | Written by Mark Michell (mark@codesourcery.com). |
4 | ||
f5adbb8d | 5 | This file is part of GCC. |
46e8c075 | 6 | |
f5adbb8d | 7 | GCC is free software; you can redistribute it and/or modify it |
06ceef4e | 8 | under the terms of the GNU General Public License as published by |
e77f031d | 9 | the Free Software Foundation; either version 3, or (at your option) |
06ceef4e RK |
10 | any later version. |
11 | ||
f5adbb8d | 12 | GCC is distributed in the hope that it will be useful, but |
06ceef4e RK |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | General Public License for more details. | |
9c96f3f8 | 16 | |
06ceef4e | 17 | You should have received a copy of the GNU General Public License |
e77f031d NC |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
46e8c075 MM |
20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
4977bab6 | 23 | #include "coretypes.h" |
2adfab87 | 24 | #include "target.h" |
46e8c075 | 25 | #include "cp-tree.h" |
2adfab87 AM |
26 | #include "stringpool.h" |
27 | #include "cgraph.h" | |
2b85879e | 28 | #include "debug.h" |
25af8512 | 29 | #include "tree-inline.h" |
a406865a | 30 | #include "tree-iterator.h" |
46e8c075 | 31 | |
46e8c075 MM |
32 | /* Prototypes. */ |
33 | ||
b8ad8c93 | 34 | static void update_cloned_parm (tree, tree, bool); |
95fabfd3 | 35 | |
d60e5448 MM |
36 | /* CLONED_PARM is a copy of CLONE, generated for a cloned constructor |
37 | or destructor. Update it to ensure that the source-position for | |
38 | the cloned parameter matches that for the original, and that the | |
39 | debugging generation code will be able to find the original PARM. */ | |
40 | ||
41 | static void | |
b8ad8c93 | 42 | update_cloned_parm (tree parm, tree cloned_parm, bool first) |
d60e5448 MM |
43 | { |
44 | DECL_ABSTRACT_ORIGIN (cloned_parm) = parm; | |
d30a825a | 45 | |
c6002625 | 46 | /* We may have taken its address. */ |
d30a825a NS |
47 | TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm); |
48 | ||
c6002625 | 49 | /* The definition might have different constness. */ |
d30a825a | 50 | TREE_READONLY (cloned_parm) = TREE_READONLY (parm); |
c8094d83 | 51 | |
b8ad8c93 | 52 | TREE_USED (cloned_parm) = !first || TREE_USED (parm); |
c8094d83 | 53 | |
c6002625 | 54 | /* The name may have changed from the declaration. */ |
d60e5448 | 55 | DECL_NAME (cloned_parm) = DECL_NAME (parm); |
f31686a3 | 56 | DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm); |
e777303f | 57 | TREE_TYPE (cloned_parm) = TREE_TYPE (parm); |
b3c4918f AP |
58 | |
59 | DECL_GIMPLE_REG_P (cloned_parm) = DECL_GIMPLE_REG_P (parm); | |
d60e5448 MM |
60 | } |
61 | ||
726a989a RB |
62 | |
63 | /* FN is a function in High GIMPLE form that has a complete body and no | |
64 | CFG. CLONE is a function whose body is to be set to a copy of FN, | |
65 | mapping argument declarations according to the ARG_MAP splay_tree. */ | |
9ff420f1 PB |
66 | |
67 | static void | |
68 | clone_body (tree clone, tree fn, void *arg_map) | |
69 | { | |
70 | copy_body_data id; | |
a406865a | 71 | tree stmts; |
9ff420f1 | 72 | |
726a989a RB |
73 | /* Clone the body, as if we were making an inline call. But, remap |
74 | the parameters in the callee to the parameters of caller. */ | |
9ff420f1 PB |
75 | memset (&id, 0, sizeof (id)); |
76 | id.src_fn = fn; | |
77 | id.dst_fn = clone; | |
78 | id.src_cfun = DECL_STRUCT_FUNCTION (fn); | |
b787e7a2 | 79 | id.decl_map = static_cast<hash_map<tree, tree> *> (arg_map); |
9ff420f1 PB |
80 | |
81 | id.copy_decl = copy_decl_no_change; | |
82 | id.transform_call_graph_edges = CB_CGE_DUPLICATE; | |
83 | id.transform_new_cfg = true; | |
84 | id.transform_return_to_modify = false; | |
726a989a | 85 | id.transform_lang_insert_block = NULL; |
9ff420f1 PB |
86 | |
87 | /* We're not inside any EH region. */ | |
1d65f45c | 88 | id.eh_lp_nr = 0; |
9ff420f1 | 89 | |
a406865a RG |
90 | stmts = DECL_SAVED_TREE (fn); |
91 | walk_tree (&stmts, copy_tree_body_r, &id, NULL); | |
e6ca6e2a JM |
92 | |
93 | /* Also remap the initializer of any static variables so that they (in | |
94 | particular, any label addresses) correspond to the base variant rather | |
95 | than the abstract one. */ | |
96 | if (DECL_NAME (clone) == base_dtor_identifier | |
97 | || DECL_NAME (clone) == base_ctor_identifier) | |
98 | { | |
c021f10b NF |
99 | unsigned ix; |
100 | tree decl; | |
101 | ||
102 | FOR_EACH_LOCAL_DECL (DECL_STRUCT_FUNCTION (fn), ix, decl) | |
103 | walk_tree (&DECL_INITIAL (decl), copy_tree_body_r, &id, NULL); | |
e6ca6e2a JM |
104 | } |
105 | ||
a406865a | 106 | append_to_statement_list_force (stmts, &DECL_SAVED_TREE (clone)); |
9ff420f1 PB |
107 | } |
108 | ||
68e0e461 WG |
109 | /* DELETE_DTOR is a delete destructor whose body will be built. |
110 | COMPLETE_DTOR is the corresponding complete destructor. */ | |
111 | ||
112 | static void | |
113 | build_delete_destructor_body (tree delete_dtor, tree complete_dtor) | |
114 | { | |
68e0e461 WG |
115 | tree parm = DECL_ARGUMENTS (delete_dtor); |
116 | tree virtual_size = cxx_sizeof (current_class_type); | |
117 | ||
118 | /* Call the corresponding complete destructor. */ | |
119 | gcc_assert (complete_dtor); | |
ee392fc2 NS |
120 | tree call_dtor = build_cxx_call (complete_dtor, 1, &parm, |
121 | tf_warning_or_error); | |
68e0e461 WG |
122 | |
123 | /* Call the delete function. */ | |
ee392fc2 NS |
124 | tree call_delete = build_op_delete_call (DELETE_EXPR, current_class_ptr, |
125 | virtual_size, | |
126 | /*global_p=*/false, | |
127 | /*placement=*/NULL_TREE, | |
128 | /*alloc_fn=*/NULL_TREE, | |
129 | tf_warning_or_error); | |
130 | ||
131 | /* Operator delete must be called, whether or not the dtor throws. */ | |
132 | add_stmt (build2 (TRY_FINALLY_EXPR, void_type_node, call_dtor, call_delete)); | |
68e0e461 WG |
133 | |
134 | /* Return the address of the object. */ | |
135 | if (targetm.cxx.cdtor_returns_this ()) | |
136 | { | |
137 | tree val = DECL_ARGUMENTS (delete_dtor); | |
138 | val = build2 (MODIFY_EXPR, TREE_TYPE (val), | |
139 | DECL_RESULT (delete_dtor), val); | |
140 | add_stmt (build_stmt (0, RETURN_EXPR, val)); | |
141 | } | |
142 | } | |
143 | ||
24b3ff2c JJ |
144 | /* Return name of comdat group for complete and base ctor (or dtor) |
145 | that have the same body. If dtor is virtual, deleting dtor goes | |
146 | into this comdat group as well. */ | |
147 | ||
148 | static tree | |
149 | cdtor_comdat_group (tree complete, tree base) | |
150 | { | |
cbb4d6a4 JM |
151 | tree complete_name = DECL_ASSEMBLER_NAME (complete); |
152 | tree base_name = DECL_ASSEMBLER_NAME (base); | |
24b3ff2c JJ |
153 | char *grp_name; |
154 | const char *p, *q; | |
155 | bool diff_seen = false; | |
156 | size_t idx; | |
24b3ff2c JJ |
157 | gcc_assert (IDENTIFIER_LENGTH (complete_name) |
158 | == IDENTIFIER_LENGTH (base_name)); | |
159 | grp_name = XALLOCAVEC (char, IDENTIFIER_LENGTH (complete_name) + 1); | |
160 | p = IDENTIFIER_POINTER (complete_name); | |
161 | q = IDENTIFIER_POINTER (base_name); | |
162 | for (idx = 0; idx < IDENTIFIER_LENGTH (complete_name); idx++) | |
163 | if (p[idx] == q[idx]) | |
164 | grp_name[idx] = p[idx]; | |
165 | else | |
166 | { | |
167 | gcc_assert (!diff_seen | |
168 | && idx > 0 | |
169 | && (p[idx - 1] == 'C' || p[idx - 1] == 'D') | |
170 | && p[idx] == '1' | |
171 | && q[idx] == '2'); | |
172 | grp_name[idx] = '5'; | |
173 | diff_seen = true; | |
174 | } | |
175 | grp_name[idx] = '\0'; | |
cbb4d6a4 | 176 | gcc_assert (diff_seen); |
24b3ff2c JJ |
177 | return get_identifier (grp_name); |
178 | } | |
179 | ||
1f26ac87 JM |
180 | /* Returns true iff we can make the base and complete [cd]tor aliases of |
181 | the same symbol rather than separate functions. */ | |
db9b2174 | 182 | |
1f26ac87 JM |
183 | static bool |
184 | can_alias_cdtor (tree fn) | |
db9b2174 | 185 | { |
1f26ac87 JM |
186 | #ifndef ASM_OUTPUT_DEF |
187 | /* If aliases aren't supported by the assembler, fail. */ | |
188 | return false; | |
189 | #endif | |
190 | /* We can't use an alias if there are virtual bases. */ | |
191 | if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) | |
192 | return false; | |
193 | /* ??? Why not use aliases with -frepo? */ | |
194 | if (flag_use_repository) | |
195 | return false; | |
196 | gcc_assert (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn) | |
197 | || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)); | |
198 | /* Don't use aliases for weak/linkonce definitions unless we can put both | |
199 | symbols in the same COMDAT group. */ | |
200 | return (DECL_INTERFACE_KNOWN (fn) | |
201 | && (SUPPORTS_ONE_ONLY || !DECL_WEAK (fn)) | |
202 | && (!DECL_ONE_ONLY (fn) | |
203 | || (HAVE_COMDAT_GROUP && DECL_WEAK (fn)))); | |
204 | } | |
db9b2174 | 205 | |
1f26ac87 JM |
206 | /* FN is a [cd]tor, fns is a pointer to an array of length 3. Fill fns |
207 | with pointers to the base, complete, and deleting variants. */ | |
db9b2174 | 208 | |
1f26ac87 JM |
209 | static void |
210 | populate_clone_array (tree fn, tree *fns) | |
211 | { | |
212 | tree clone; | |
5daf7c0a | 213 | |
b2583345 JJ |
214 | fns[0] = NULL_TREE; |
215 | fns[1] = NULL_TREE; | |
216 | fns[2] = NULL_TREE; | |
217 | ||
68e0e461 WG |
218 | /* Look for the complete destructor which may be used to build the |
219 | delete destructor. */ | |
220 | FOR_EACH_CLONE (clone, fn) | |
b2583345 JJ |
221 | if (DECL_NAME (clone) == complete_dtor_identifier |
222 | || DECL_NAME (clone) == complete_ctor_identifier) | |
223 | fns[1] = clone; | |
224 | else if (DECL_NAME (clone) == base_dtor_identifier | |
225 | || DECL_NAME (clone) == base_ctor_identifier) | |
226 | fns[0] = clone; | |
227 | else if (DECL_NAME (clone) == deleting_dtor_identifier) | |
228 | fns[2] = clone; | |
229 | else | |
230 | gcc_unreachable (); | |
1f26ac87 JM |
231 | } |
232 | ||
233 | /* FN is a constructor or destructor, and there are FUNCTION_DECLs | |
234 | cloned from it nearby. Instead of cloning this body, leave it | |
235 | alone and create tiny one-call bodies for the cloned | |
236 | FUNCTION_DECLs. These clones are sibcall candidates, and their | |
237 | resulting code will be very thunk-esque. */ | |
238 | ||
239 | static bool | |
240 | maybe_thunk_body (tree fn, bool force) | |
241 | { | |
242 | tree bind, block, call, clone, clone_result, fn_parm, fn_parm_typelist; | |
243 | tree last_arg, modify, *args; | |
244 | int parmno, vtt_parmno, max_parms; | |
245 | tree fns[3]; | |
246 | ||
247 | if (!force && !flag_declone_ctor_dtor) | |
248 | return 0; | |
249 | ||
250 | /* If function accepts variable arguments, give up. */ | |
251 | last_arg = tree_last (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
252 | if (last_arg != void_list_node) | |
253 | return 0; | |
254 | ||
255 | /* If we got this far, we've decided to turn the clones into thunks. */ | |
256 | ||
257 | /* We're going to generate code for fn, so it is no longer "abstract." | |
258 | Also make the unified ctor/dtor private to either the translation unit | |
259 | (for non-vague linkage ctors) or the COMDAT group (otherwise). */ | |
260 | ||
261 | populate_clone_array (fn, fns); | |
00de328a | 262 | DECL_ABSTRACT_P (fn) = false; |
1f26ac87 JM |
263 | if (!DECL_WEAK (fn)) |
264 | { | |
265 | TREE_PUBLIC (fn) = false; | |
266 | DECL_EXTERNAL (fn) = false; | |
267 | DECL_INTERFACE_KNOWN (fn) = true; | |
268 | } | |
269 | else if (HAVE_COMDAT_GROUP) | |
270 | { | |
ec5a0fe0 JJ |
271 | /* At eof, defer creation of mangling aliases temporarily. */ |
272 | bool save_defer_mangling_aliases = defer_mangling_aliases; | |
273 | defer_mangling_aliases = true; | |
1f26ac87 | 274 | tree comdat_group = cdtor_comdat_group (fns[1], fns[0]); |
ec5a0fe0 | 275 | defer_mangling_aliases = save_defer_mangling_aliases; |
d52f5295 ML |
276 | cgraph_node::get_create (fns[0])->set_comdat_group (comdat_group); |
277 | cgraph_node::get_create (fns[1])->add_to_same_comdat_group | |
278 | (cgraph_node::get_create (fns[0])); | |
279 | symtab_node::get (fn)->add_to_same_comdat_group | |
280 | (symtab_node::get (fns[0])); | |
1f26ac87 JM |
281 | if (fns[2]) |
282 | /* If *[CD][12]* dtors go into the *[CD]5* comdat group and dtor is | |
283 | virtual, it goes into the same comdat group as well. */ | |
d52f5295 ML |
284 | cgraph_node::get_create (fns[2])->add_to_same_comdat_group |
285 | (symtab_node::get (fns[0])); | |
ec5a0fe0 JJ |
286 | /* Emit them now that the thunks are same comdat group aliases. */ |
287 | if (!save_defer_mangling_aliases) | |
288 | generate_mangling_aliases (); | |
1f26ac87 JM |
289 | TREE_PUBLIC (fn) = false; |
290 | DECL_EXTERNAL (fn) = false; | |
291 | DECL_INTERFACE_KNOWN (fn) = true; | |
292 | /* function_and_variable_visibility doesn't want !PUBLIC decls to | |
293 | have these flags set. */ | |
294 | DECL_WEAK (fn) = false; | |
295 | DECL_COMDAT (fn) = false; | |
296 | } | |
297 | ||
298 | /* Find the vtt_parm, if present. */ | |
299 | for (vtt_parmno = -1, parmno = 0, fn_parm = DECL_ARGUMENTS (fn); | |
300 | fn_parm; | |
301 | ++parmno, fn_parm = TREE_CHAIN (fn_parm)) | |
302 | { | |
303 | if (DECL_ARTIFICIAL (fn_parm) | |
304 | && DECL_NAME (fn_parm) == vtt_parm_identifier) | |
305 | { | |
306 | /* Compensate for removed in_charge parameter. */ | |
307 | vtt_parmno = parmno; | |
308 | break; | |
309 | } | |
310 | } | |
311 | ||
312 | /* Allocate an argument buffer for build_cxx_call(). | |
313 | Make sure it is large enough for any of the clones. */ | |
314 | max_parms = 0; | |
315 | FOR_EACH_CLONE (clone, fn) | |
316 | { | |
317 | int length = list_length (DECL_ARGUMENTS (fn)); | |
318 | if (length > max_parms) | |
319 | max_parms = length; | |
320 | } | |
321 | args = (tree *) alloca (max_parms * sizeof (tree)); | |
322 | ||
323 | /* We know that any clones immediately follow FN in TYPE_METHODS. */ | |
324 | FOR_EACH_CLONE (clone, fn) | |
325 | { | |
326 | tree clone_parm; | |
327 | ||
328 | /* If we've already generated a body for this clone, avoid | |
329 | duplicating it. (Is it possible for a clone-list to grow after we | |
330 | first see it?) */ | |
331 | if (DECL_SAVED_TREE (clone) || TREE_ASM_WRITTEN (clone)) | |
332 | continue; | |
333 | ||
334 | /* Start processing the function. */ | |
335 | start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED); | |
336 | ||
337 | if (clone == fns[2]) | |
338 | { | |
339 | for (clone_parm = DECL_ARGUMENTS (clone); clone_parm; | |
340 | clone_parm = TREE_CHAIN (clone_parm)) | |
341 | DECL_ABSTRACT_ORIGIN (clone_parm) = NULL_TREE; | |
342 | /* Build the delete destructor by calling complete destructor and | |
343 | delete function. */ | |
344 | build_delete_destructor_body (clone, fns[1]); | |
345 | } | |
346 | else | |
347 | { | |
348 | /* Walk parameter lists together, creating parameter list for | |
349 | call to original function. */ | |
350 | for (parmno = 0, | |
351 | fn_parm = DECL_ARGUMENTS (fn), | |
352 | fn_parm_typelist = TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
353 | clone_parm = DECL_ARGUMENTS (clone); | |
354 | fn_parm; | |
355 | ++parmno, | |
356 | fn_parm = TREE_CHAIN (fn_parm)) | |
357 | { | |
358 | if (parmno == vtt_parmno && ! DECL_HAS_VTT_PARM_P (clone)) | |
359 | { | |
360 | gcc_assert (fn_parm_typelist); | |
361 | /* Clobber argument with formal parameter type. */ | |
362 | args[parmno] | |
363 | = convert (TREE_VALUE (fn_parm_typelist), | |
364 | null_pointer_node); | |
365 | } | |
366 | else if (parmno == 1 && DECL_HAS_IN_CHARGE_PARM_P (fn)) | |
367 | { | |
368 | tree in_charge | |
369 | = copy_node (in_charge_arg_for_name (DECL_NAME (clone))); | |
370 | args[parmno] = in_charge; | |
371 | } | |
372 | /* Map other parameters to their equivalents in the cloned | |
373 | function. */ | |
374 | else | |
375 | { | |
376 | gcc_assert (clone_parm); | |
377 | DECL_ABSTRACT_ORIGIN (clone_parm) = NULL; | |
378 | args[parmno] = clone_parm; | |
379 | clone_parm = TREE_CHAIN (clone_parm); | |
380 | } | |
381 | if (fn_parm_typelist) | |
382 | fn_parm_typelist = TREE_CHAIN (fn_parm_typelist); | |
383 | } | |
384 | ||
385 | /* We built this list backwards; fix now. */ | |
386 | mark_used (fn); | |
387 | call = build_cxx_call (fn, parmno, args, tf_warning_or_error); | |
388 | /* Arguments passed to the thunk by invisible reference should | |
389 | be transmitted to the callee unchanged. Do not create a | |
390 | temporary and invoke the copy constructor. The thunking | |
391 | transformation must not introduce any constructor calls. */ | |
392 | CALL_FROM_THUNK_P (call) = 1; | |
393 | block = make_node (BLOCK); | |
394 | if (targetm.cxx.cdtor_returns_this ()) | |
395 | { | |
396 | clone_result = DECL_RESULT (clone); | |
397 | modify = build2 (MODIFY_EXPR, TREE_TYPE (clone_result), | |
398 | clone_result, call); | |
8ae90330 | 399 | modify = build1 (RETURN_EXPR, void_type_node, modify); |
1f26ac87 | 400 | add_stmt (modify); |
1f26ac87 JM |
401 | } |
402 | else | |
403 | { | |
404 | add_stmt (call); | |
405 | } | |
406 | bind = c_build_bind_expr (DECL_SOURCE_LOCATION (clone), | |
407 | block, cur_stmt_list); | |
408 | DECL_SAVED_TREE (clone) = push_stmt_list (); | |
409 | add_stmt (bind); | |
410 | } | |
411 | ||
412 | DECL_ABSTRACT_ORIGIN (clone) = NULL; | |
413 | expand_or_defer_fn (finish_function (0)); | |
414 | } | |
415 | return 1; | |
416 | } | |
417 | ||
418 | /* FN is a function that has a complete body. Clone the body as | |
419 | necessary. Returns nonzero if there's no longer any need to | |
420 | process the main body. */ | |
421 | ||
422 | bool | |
423 | maybe_clone_body (tree fn) | |
424 | { | |
425 | tree comdat_group = NULL_TREE; | |
426 | tree clone; | |
427 | tree fns[3]; | |
428 | bool first = true; | |
429 | int idx; | |
430 | bool need_alias = false; | |
431 | ||
432 | /* We only clone constructors and destructors. */ | |
433 | if (!DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn) | |
434 | && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)) | |
435 | return 0; | |
436 | ||
437 | populate_clone_array (fn, fns); | |
68e0e461 | 438 | |
e6ca6e2a JM |
439 | /* Remember if we can't have multiple clones for some reason. We need to |
440 | check this before we remap local static initializers in clone_body. */ | |
441 | if (!tree_versionable_function_p (fn)) | |
442 | need_alias = true; | |
443 | ||
db9b2174 MM |
444 | /* We know that any clones immediately follow FN in the TYPE_METHODS |
445 | list. */ | |
f44b0c8e | 446 | push_to_top_level (); |
b2583345 | 447 | for (idx = 0; idx < 3; idx++) |
db9b2174 MM |
448 | { |
449 | tree parm; | |
450 | tree clone_parm; | |
db9b2174 | 451 | |
b2583345 JJ |
452 | clone = fns[idx]; |
453 | if (!clone) | |
454 | continue; | |
455 | ||
db9b2174 | 456 | /* Update CLONE's source position information to match FN's. */ |
f31686a3 | 457 | DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn); |
79065db2 | 458 | DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn); |
525c617d | 459 | DECL_DECLARED_CONSTEXPR_P (clone) = DECL_DECLARED_CONSTEXPR_P (fn); |
3ec6bad3 MM |
460 | DECL_COMDAT (clone) = DECL_COMDAT (fn); |
461 | DECL_WEAK (clone) = DECL_WEAK (fn); | |
fc26fae3 RAE |
462 | |
463 | /* We don't copy the comdat group from fn to clone because the assembler | |
464 | name of fn was corrupted by write_mangled_name by adding *INTERNAL* | |
465 | to it. By doing so, it also corrupted the comdat group. */ | |
466 | if (DECL_ONE_ONLY (fn)) | |
d52f5295 | 467 | cgraph_node::get_create (clone)->set_comdat_group (cxx_comdat_group (clone)); |
459c43ad MM |
468 | DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn); |
469 | DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn); | |
470 | DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn); | |
471 | DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn); | |
b96ada87 | 472 | TREE_PUBLIC (clone) = TREE_PUBLIC (fn); |
968b41a1 | 473 | DECL_VISIBILITY (clone) = DECL_VISIBILITY (fn); |
d7afec4b | 474 | DECL_VISIBILITY_SPECIFIED (clone) = DECL_VISIBILITY_SPECIFIED (fn); |
39e6670f | 475 | DECL_DLLIMPORT_P (clone) = DECL_DLLIMPORT_P (fn); |
87e92864 AP |
476 | DECL_ATTRIBUTES (clone) = copy_list (DECL_ATTRIBUTES (fn)); |
477 | DECL_DISREGARD_INLINE_LIMITS (clone) = DECL_DISREGARD_INLINE_LIMITS (fn); | |
24d047a3 | 478 | set_decl_section_name (clone, DECL_SECTION_NAME (fn)); |
db9b2174 | 479 | |
c6002625 | 480 | /* Adjust the parameter names and locations. */ |
02a1a68c NS |
481 | parm = DECL_ARGUMENTS (fn); |
482 | clone_parm = DECL_ARGUMENTS (clone); | |
4a90862e | 483 | /* Update the `this' parameter, which is always first. */ |
b8ad8c93 | 484 | update_cloned_parm (parm, clone_parm, first); |
910ad8de NF |
485 | parm = DECL_CHAIN (parm); |
486 | clone_parm = DECL_CHAIN (clone_parm); | |
02a1a68c | 487 | if (DECL_HAS_IN_CHARGE_PARM_P (fn)) |
910ad8de | 488 | parm = DECL_CHAIN (parm); |
02a1a68c | 489 | if (DECL_HAS_VTT_PARM_P (fn)) |
910ad8de | 490 | parm = DECL_CHAIN (parm); |
02a1a68c | 491 | if (DECL_HAS_VTT_PARM_P (clone)) |
910ad8de | 492 | clone_parm = DECL_CHAIN (clone_parm); |
02a1a68c | 493 | for (; parm; |
910ad8de | 494 | parm = DECL_CHAIN (parm), clone_parm = DECL_CHAIN (clone_parm)) |
85b22f78 | 495 | /* Update this parameter. */ |
b8ad8c93 | 496 | update_cloned_parm (parm, clone_parm, first); |
1f26ac87 JM |
497 | } |
498 | ||
499 | bool can_alias = can_alias_cdtor (fn); | |
500 | ||
501 | /* If we decide to turn clones into thunks, they will branch to fn. | |
502 | Must have original function available to call. */ | |
503 | if (!can_alias && maybe_thunk_body (fn, need_alias)) | |
504 | { | |
505 | pop_from_top_level (); | |
506 | /* We still need to emit the original function. */ | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* Emit the DWARF1 abstract instance. */ | |
511 | (*debug_hooks->deferred_inline_function) (fn); | |
512 | ||
513 | /* We know that any clones immediately follow FN in the TYPE_METHODS list. */ | |
514 | for (idx = 0; idx < 3; idx++) | |
515 | { | |
516 | tree parm; | |
517 | tree clone_parm; | |
518 | int parmno; | |
b787e7a2 | 519 | hash_map<tree, tree> *decl_map; |
1f26ac87 JM |
520 | bool alias = false; |
521 | ||
522 | clone = fns[idx]; | |
523 | if (!clone) | |
524 | continue; | |
02a1a68c | 525 | |
db9b2174 | 526 | /* Start processing the function. */ |
058b15c1 | 527 | start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED); |
db9b2174 | 528 | |
b2583345 JJ |
529 | /* Tell cgraph if both ctors or both dtors are known to have |
530 | the same body. */ | |
1f26ac87 | 531 | if (can_alias |
b2583345 JJ |
532 | && fns[0] |
533 | && idx == 1 | |
d52f5295 ML |
534 | && cgraph_node::get_create (fns[0])->create_same_body_alias |
535 | (clone, fns[0])) | |
6744a6ab JH |
536 | { |
537 | alias = true; | |
24b3ff2c JJ |
538 | if (DECL_ONE_ONLY (fns[0])) |
539 | { | |
540 | /* For comdat base and complete cdtors put them | |
541 | into the same, *[CD]5* comdat group instead of | |
542 | *[CD][12]*. */ | |
543 | comdat_group = cdtor_comdat_group (fns[1], fns[0]); | |
d52f5295 ML |
544 | cgraph_node::get_create (fns[0])->set_comdat_group (comdat_group); |
545 | if (symtab_node::get (clone)->same_comdat_group) | |
546 | symtab_node::get (clone)->remove_from_same_comdat_group (); | |
547 | symtab_node::get (clone)->add_to_same_comdat_group | |
548 | (symtab_node::get (fns[0])); | |
24b3ff2c | 549 | } |
6744a6ab | 550 | } |
b2583345 | 551 | |
68e0e461 WG |
552 | /* Build the delete destructor by calling complete destructor |
553 | and delete function. */ | |
b2583345 | 554 | if (idx == 2) |
2fda8e14 JM |
555 | { |
556 | build_delete_destructor_body (clone, fns[1]); | |
557 | /* If *[CD][12]* dtors go into the *[CD]5* comdat group and dtor is | |
558 | virtual, it goes into the same comdat group as well. */ | |
559 | if (comdat_group) | |
d52f5295 ML |
560 | cgraph_node::get_create (clone)->add_to_same_comdat_group |
561 | (symtab_node::get (fns[0])); | |
2fda8e14 | 562 | } |
b2583345 JJ |
563 | else if (alias) |
564 | /* No need to populate body. */ ; | |
68e0e461 | 565 | else |
b2583345 | 566 | { |
e6ca6e2a JM |
567 | /* If we can't have multiple copies of FN (say, because there's a |
568 | static local initialized with the address of a label), we need | |
569 | to use an alias for the complete variant. */ | |
570 | if (idx == 1 && need_alias) | |
571 | { | |
572 | if (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_set) | |
573 | sorry (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_reason, fn); | |
574 | else | |
575 | sorry ("making multiple clones of %qD", fn); | |
576 | } | |
577 | ||
68e0e461 | 578 | /* Remap the parameters. */ |
b787e7a2 | 579 | decl_map = new hash_map<tree, tree>; |
68e0e461 WG |
580 | for (parmno = 0, |
581 | parm = DECL_ARGUMENTS (fn), | |
582 | clone_parm = DECL_ARGUMENTS (clone); | |
583 | parm; | |
584 | ++parmno, | |
910ad8de | 585 | parm = DECL_CHAIN (parm)) |
68e0e461 WG |
586 | { |
587 | /* Map the in-charge parameter to an appropriate constant. */ | |
588 | if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1) | |
589 | { | |
590 | tree in_charge; | |
591 | in_charge = in_charge_arg_for_name (DECL_NAME (clone)); | |
b787e7a2 | 592 | decl_map->put (parm, in_charge); |
68e0e461 WG |
593 | } |
594 | else if (DECL_ARTIFICIAL (parm) | |
595 | && DECL_NAME (parm) == vtt_parm_identifier) | |
596 | { | |
597 | /* For a subobject constructor or destructor, the next | |
598 | argument is the VTT parameter. Remap the VTT_PARM | |
599 | from the CLONE to this parameter. */ | |
600 | if (DECL_HAS_VTT_PARM_P (clone)) | |
601 | { | |
602 | DECL_ABSTRACT_ORIGIN (clone_parm) = parm; | |
b787e7a2 | 603 | decl_map->put (parm, clone_parm); |
910ad8de | 604 | clone_parm = DECL_CHAIN (clone_parm); |
68e0e461 WG |
605 | } |
606 | /* Otherwise, map the VTT parameter to `NULL'. */ | |
607 | else | |
b787e7a2 TS |
608 | { |
609 | tree t | |
610 | = fold_convert (TREE_TYPE (parm), null_pointer_node); | |
611 | decl_map->put (parm, t); | |
612 | } | |
68e0e461 WG |
613 | } |
614 | /* Map other parameters to their equivalents in the cloned | |
615 | function. */ | |
616 | else | |
617 | { | |
b787e7a2 | 618 | decl_map->put (parm, clone_parm); |
910ad8de | 619 | clone_parm = DECL_CHAIN (clone_parm); |
68e0e461 WG |
620 | } |
621 | } | |
622 | ||
623 | if (targetm.cxx.cdtor_returns_this ()) | |
624 | { | |
625 | parm = DECL_RESULT (fn); | |
626 | clone_parm = DECL_RESULT (clone); | |
b787e7a2 | 627 | decl_map->put (parm, clone_parm); |
68e0e461 WG |
628 | } |
629 | ||
630 | /* Clone the body. */ | |
631 | clone_body (clone, fn, decl_map); | |
632 | ||
633 | /* Clean up. */ | |
b787e7a2 | 634 | delete decl_map; |
68e0e461 | 635 | } |
db9b2174 | 636 | |
b2dd096b MM |
637 | /* The clone can throw iff the original function can throw. */ |
638 | cp_function_chain->can_throw = !TREE_NOTHROW (fn); | |
639 | ||
db9b2174 | 640 | /* Now, expand this function into RTL, if appropriate. */ |
5daf7c0a JM |
641 | finish_function (0); |
642 | BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn); | |
b2583345 | 643 | if (alias) |
249ccaff JJ |
644 | { |
645 | if (expand_or_defer_fn_1 (clone)) | |
646 | emit_associated_thunks (clone); | |
ca30abcd JM |
647 | /* We didn't generate a body, so remove the empty one. */ |
648 | DECL_SAVED_TREE (clone) = NULL_TREE; | |
249ccaff | 649 | } |
b2583345 JJ |
650 | else |
651 | expand_or_defer_fn (clone); | |
b8ad8c93 | 652 | first = false; |
db9b2174 | 653 | } |
f44b0c8e | 654 | pop_from_top_level (); |
9c96f3f8 | 655 | |
db9b2174 MM |
656 | /* We don't need to process the original function any further. */ |
657 | return 1; | |
658 | } |