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31236dcd | 1 | /* Perform optimizations on tree structure. |
8e8f6434 | 2 | Copyright (C) 1998-2018 Free Software Foundation, Inc. |
31236dcd | 3 | Written by Mark Michell (mark@codesourcery.com). |
4 | ||
6f0d25a6 | 5 | This file is part of GCC. |
31236dcd | 6 | |
6f0d25a6 | 7 | GCC is free software; you can redistribute it and/or modify it |
b278476e | 8 | under the terms of the GNU General Public License as published by |
aa139c3f | 9 | the Free Software Foundation; either version 3, or (at your option) |
b278476e | 10 | any later version. |
11 | ||
6f0d25a6 | 12 | GCC is distributed in the hope that it will be useful, but |
b278476e | 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. | |
4d26ca8c | 16 | |
b278476e | 17 | You should have received a copy of the GNU General Public License |
aa139c3f | 18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ | |
31236dcd | 20 | |
21 | #include "config.h" | |
22 | #include "system.h" | |
805e22b2 | 23 | #include "coretypes.h" |
4cba6f60 | 24 | #include "target.h" |
31236dcd | 25 | #include "cp-tree.h" |
4cba6f60 | 26 | #include "stringpool.h" |
27 | #include "cgraph.h" | |
c37d72e9 | 28 | #include "debug.h" |
1e3b023c | 29 | #include "tree-inline.h" |
bfec3452 | 30 | #include "tree-iterator.h" |
31236dcd | 31 | |
31236dcd | 32 | /* Prototypes. */ |
33 | ||
ff64eef0 | 34 | static void update_cloned_parm (tree, tree, bool); |
cd25c883 | 35 | |
b8792625 | 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 | |
ff64eef0 | 42 | update_cloned_parm (tree parm, tree cloned_parm, bool first) |
b8792625 | 43 | { |
44 | DECL_ABSTRACT_ORIGIN (cloned_parm) = parm; | |
b00bfd31 | 45 | |
47cd6605 | 46 | /* We may have taken its address. */ |
b00bfd31 | 47 | TREE_ADDRESSABLE (cloned_parm) = TREE_ADDRESSABLE (parm); |
48 | ||
bdb5503b | 49 | DECL_BY_REFERENCE (cloned_parm) = DECL_BY_REFERENCE (parm); |
50 | ||
47cd6605 | 51 | /* The definition might have different constness. */ |
b00bfd31 | 52 | TREE_READONLY (cloned_parm) = TREE_READONLY (parm); |
9031d10b | 53 | |
ff64eef0 | 54 | TREE_USED (cloned_parm) = !first || TREE_USED (parm); |
9031d10b | 55 | |
47cd6605 | 56 | /* The name may have changed from the declaration. */ |
b8792625 | 57 | DECL_NAME (cloned_parm) = DECL_NAME (parm); |
346064d9 | 58 | DECL_SOURCE_LOCATION (cloned_parm) = DECL_SOURCE_LOCATION (parm); |
39908afa | 59 | TREE_TYPE (cloned_parm) = TREE_TYPE (parm); |
b58456b5 | 60 | |
61 | DECL_GIMPLE_REG_P (cloned_parm) = DECL_GIMPLE_REG_P (parm); | |
b8792625 | 62 | } |
63 | ||
75a70cf9 | 64 | |
65 | /* FN is a function in High GIMPLE form that has a complete body and no | |
66 | CFG. CLONE is a function whose body is to be set to a copy of FN, | |
67 | mapping argument declarations according to the ARG_MAP splay_tree. */ | |
32020b10 | 68 | |
69 | static void | |
70 | clone_body (tree clone, tree fn, void *arg_map) | |
71 | { | |
72 | copy_body_data id; | |
bfec3452 | 73 | tree stmts; |
32020b10 | 74 | |
75a70cf9 | 75 | /* Clone the body, as if we were making an inline call. But, remap |
76 | the parameters in the callee to the parameters of caller. */ | |
32020b10 | 77 | memset (&id, 0, sizeof (id)); |
78 | id.src_fn = fn; | |
79 | id.dst_fn = clone; | |
80 | id.src_cfun = DECL_STRUCT_FUNCTION (fn); | |
06ecf488 | 81 | id.decl_map = static_cast<hash_map<tree, tree> *> (arg_map); |
32020b10 | 82 | |
83 | id.copy_decl = copy_decl_no_change; | |
84 | id.transform_call_graph_edges = CB_CGE_DUPLICATE; | |
85 | id.transform_new_cfg = true; | |
86 | id.transform_return_to_modify = false; | |
75a70cf9 | 87 | id.transform_lang_insert_block = NULL; |
32020b10 | 88 | |
89 | /* We're not inside any EH region. */ | |
e38def9c | 90 | id.eh_lp_nr = 0; |
32020b10 | 91 | |
bfec3452 | 92 | stmts = DECL_SAVED_TREE (fn); |
93 | walk_tree (&stmts, copy_tree_body_r, &id, NULL); | |
a2ad849c | 94 | |
95 | /* Also remap the initializer of any static variables so that they (in | |
96 | particular, any label addresses) correspond to the base variant rather | |
97 | than the abstract one. */ | |
98 | if (DECL_NAME (clone) == base_dtor_identifier | |
99 | || DECL_NAME (clone) == base_ctor_identifier) | |
100 | { | |
2ab2ce89 | 101 | unsigned ix; |
102 | tree decl; | |
103 | ||
104 | FOR_EACH_LOCAL_DECL (DECL_STRUCT_FUNCTION (fn), ix, decl) | |
105 | walk_tree (&DECL_INITIAL (decl), copy_tree_body_r, &id, NULL); | |
a2ad849c | 106 | } |
107 | ||
bfec3452 | 108 | append_to_statement_list_force (stmts, &DECL_SAVED_TREE (clone)); |
32020b10 | 109 | } |
110 | ||
e2932b0d | 111 | /* DELETE_DTOR is a delete destructor whose body will be built. |
112 | COMPLETE_DTOR is the corresponding complete destructor. */ | |
113 | ||
114 | static void | |
115 | build_delete_destructor_body (tree delete_dtor, tree complete_dtor) | |
116 | { | |
e2932b0d | 117 | tree parm = DECL_ARGUMENTS (delete_dtor); |
118 | tree virtual_size = cxx_sizeof (current_class_type); | |
119 | ||
e2932b0d | 120 | /* Call the delete function. */ |
2b073aa6 | 121 | tree call_delete = build_op_delete_call (DELETE_EXPR, current_class_ptr, |
122 | virtual_size, | |
123 | /*global_p=*/false, | |
124 | /*placement=*/NULL_TREE, | |
125 | /*alloc_fn=*/NULL_TREE, | |
126 | tf_warning_or_error); | |
127 | ||
76b94d4b | 128 | tree op = get_callee_fndecl (call_delete); |
129 | if (op && DECL_P (op) && destroying_delete_p (op)) | |
130 | { | |
131 | /* The destroying delete will handle calling complete_dtor. */ | |
132 | add_stmt (call_delete); | |
133 | } | |
134 | else | |
135 | { | |
136 | /* Call the corresponding complete destructor. */ | |
137 | gcc_assert (complete_dtor); | |
138 | tree call_dtor = build_cxx_call (complete_dtor, 1, &parm, | |
139 | tf_warning_or_error); | |
140 | ||
141 | /* Operator delete must be called, whether or not the dtor throws. */ | |
142 | add_stmt (build2 (TRY_FINALLY_EXPR, void_type_node, | |
143 | call_dtor, call_delete)); | |
144 | } | |
e2932b0d | 145 | |
76b94d4b | 146 | /* Return the address of the object. |
147 | ??? How is it useful to return an invalid address? */ | |
e2932b0d | 148 | if (targetm.cxx.cdtor_returns_this ()) |
149 | { | |
150 | tree val = DECL_ARGUMENTS (delete_dtor); | |
151 | val = build2 (MODIFY_EXPR, TREE_TYPE (val), | |
152 | DECL_RESULT (delete_dtor), val); | |
153 | add_stmt (build_stmt (0, RETURN_EXPR, val)); | |
154 | } | |
155 | } | |
156 | ||
1d4ef5e7 | 157 | /* Return name of comdat group for complete and base ctor (or dtor) |
158 | that have the same body. If dtor is virtual, deleting dtor goes | |
159 | into this comdat group as well. */ | |
160 | ||
161 | static tree | |
162 | cdtor_comdat_group (tree complete, tree base) | |
163 | { | |
237d7956 | 164 | tree complete_name = DECL_ASSEMBLER_NAME (complete); |
165 | tree base_name = DECL_ASSEMBLER_NAME (base); | |
1d4ef5e7 | 166 | char *grp_name; |
167 | const char *p, *q; | |
168 | bool diff_seen = false; | |
169 | size_t idx; | |
1d4ef5e7 | 170 | gcc_assert (IDENTIFIER_LENGTH (complete_name) |
171 | == IDENTIFIER_LENGTH (base_name)); | |
172 | grp_name = XALLOCAVEC (char, IDENTIFIER_LENGTH (complete_name) + 1); | |
173 | p = IDENTIFIER_POINTER (complete_name); | |
174 | q = IDENTIFIER_POINTER (base_name); | |
175 | for (idx = 0; idx < IDENTIFIER_LENGTH (complete_name); idx++) | |
176 | if (p[idx] == q[idx]) | |
177 | grp_name[idx] = p[idx]; | |
178 | else | |
179 | { | |
180 | gcc_assert (!diff_seen | |
181 | && idx > 0 | |
7896267d | 182 | && (p[idx - 1] == 'C' || p[idx - 1] == 'D' |
183 | || p[idx - 1] == 'I') | |
1d4ef5e7 | 184 | && p[idx] == '1' |
185 | && q[idx] == '2'); | |
186 | grp_name[idx] = '5'; | |
187 | diff_seen = true; | |
188 | } | |
189 | grp_name[idx] = '\0'; | |
237d7956 | 190 | gcc_assert (diff_seen); |
1d4ef5e7 | 191 | return get_identifier (grp_name); |
192 | } | |
193 | ||
468088ac | 194 | /* Returns true iff we can make the base and complete [cd]tor aliases of |
195 | the same symbol rather than separate functions. */ | |
e55cba4c | 196 | |
468088ac | 197 | static bool |
198 | can_alias_cdtor (tree fn) | |
e55cba4c | 199 | { |
468088ac | 200 | /* If aliases aren't supported by the assembler, fail. */ |
07b8a412 | 201 | if (!TARGET_SUPPORTS_ALIASES) |
202 | return false; | |
203 | ||
468088ac | 204 | /* We can't use an alias if there are virtual bases. */ |
205 | if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) | |
206 | return false; | |
207 | /* ??? Why not use aliases with -frepo? */ | |
208 | if (flag_use_repository) | |
209 | return false; | |
c6e04fca | 210 | gcc_assert (DECL_MAYBE_IN_CHARGE_CDTOR_P (fn)); |
468088ac | 211 | /* Don't use aliases for weak/linkonce definitions unless we can put both |
212 | symbols in the same COMDAT group. */ | |
213 | return (DECL_INTERFACE_KNOWN (fn) | |
214 | && (SUPPORTS_ONE_ONLY || !DECL_WEAK (fn)) | |
215 | && (!DECL_ONE_ONLY (fn) | |
216 | || (HAVE_COMDAT_GROUP && DECL_WEAK (fn)))); | |
217 | } | |
e55cba4c | 218 | |
468088ac | 219 | /* FN is a [cd]tor, fns is a pointer to an array of length 3. Fill fns |
220 | with pointers to the base, complete, and deleting variants. */ | |
e55cba4c | 221 | |
468088ac | 222 | static void |
223 | populate_clone_array (tree fn, tree *fns) | |
224 | { | |
225 | tree clone; | |
8f80e66d | 226 | |
ed772161 | 227 | fns[0] = NULL_TREE; |
228 | fns[1] = NULL_TREE; | |
229 | fns[2] = NULL_TREE; | |
230 | ||
e2932b0d | 231 | /* Look for the complete destructor which may be used to build the |
232 | delete destructor. */ | |
233 | FOR_EACH_CLONE (clone, fn) | |
ed772161 | 234 | if (DECL_NAME (clone) == complete_dtor_identifier |
235 | || DECL_NAME (clone) == complete_ctor_identifier) | |
236 | fns[1] = clone; | |
237 | else if (DECL_NAME (clone) == base_dtor_identifier | |
238 | || DECL_NAME (clone) == base_ctor_identifier) | |
239 | fns[0] = clone; | |
240 | else if (DECL_NAME (clone) == deleting_dtor_identifier) | |
241 | fns[2] = clone; | |
242 | else | |
243 | gcc_unreachable (); | |
468088ac | 244 | } |
245 | ||
246 | /* FN is a constructor or destructor, and there are FUNCTION_DECLs | |
247 | cloned from it nearby. Instead of cloning this body, leave it | |
248 | alone and create tiny one-call bodies for the cloned | |
249 | FUNCTION_DECLs. These clones are sibcall candidates, and their | |
250 | resulting code will be very thunk-esque. */ | |
251 | ||
252 | static bool | |
253 | maybe_thunk_body (tree fn, bool force) | |
254 | { | |
255 | tree bind, block, call, clone, clone_result, fn_parm, fn_parm_typelist; | |
256 | tree last_arg, modify, *args; | |
257 | int parmno, vtt_parmno, max_parms; | |
258 | tree fns[3]; | |
259 | ||
260 | if (!force && !flag_declone_ctor_dtor) | |
261 | return 0; | |
262 | ||
263 | /* If function accepts variable arguments, give up. */ | |
264 | last_arg = tree_last (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
265 | if (last_arg != void_list_node) | |
266 | return 0; | |
267 | ||
268 | /* If we got this far, we've decided to turn the clones into thunks. */ | |
269 | ||
270 | /* We're going to generate code for fn, so it is no longer "abstract." | |
271 | Also make the unified ctor/dtor private to either the translation unit | |
272 | (for non-vague linkage ctors) or the COMDAT group (otherwise). */ | |
273 | ||
274 | populate_clone_array (fn, fns); | |
7896267d | 275 | |
c1585b9c | 276 | /* Can happen during error recovery (c++/71464). */ |
277 | if (!fns[0] || !fns[1]) | |
278 | return 0; | |
279 | ||
7896267d | 280 | /* Don't use thunks if the base clone omits inherited parameters. */ |
c1585b9c | 281 | if (ctor_omit_inherited_parms (fns[0])) |
7896267d | 282 | return 0; |
283 | ||
16d41ae2 | 284 | DECL_ABSTRACT_P (fn) = false; |
468088ac | 285 | if (!DECL_WEAK (fn)) |
286 | { | |
287 | TREE_PUBLIC (fn) = false; | |
288 | DECL_EXTERNAL (fn) = false; | |
289 | DECL_INTERFACE_KNOWN (fn) = true; | |
290 | } | |
291 | else if (HAVE_COMDAT_GROUP) | |
292 | { | |
d3d81eb2 | 293 | /* At eof, defer creation of mangling aliases temporarily. */ |
294 | bool save_defer_mangling_aliases = defer_mangling_aliases; | |
295 | defer_mangling_aliases = true; | |
468088ac | 296 | tree comdat_group = cdtor_comdat_group (fns[1], fns[0]); |
d3d81eb2 | 297 | defer_mangling_aliases = save_defer_mangling_aliases; |
415d1b9a | 298 | cgraph_node::get_create (fns[0])->set_comdat_group (comdat_group); |
299 | cgraph_node::get_create (fns[1])->add_to_same_comdat_group | |
300 | (cgraph_node::get_create (fns[0])); | |
301 | symtab_node::get (fn)->add_to_same_comdat_group | |
302 | (symtab_node::get (fns[0])); | |
468088ac | 303 | if (fns[2]) |
304 | /* If *[CD][12]* dtors go into the *[CD]5* comdat group and dtor is | |
305 | virtual, it goes into the same comdat group as well. */ | |
415d1b9a | 306 | cgraph_node::get_create (fns[2])->add_to_same_comdat_group |
307 | (symtab_node::get (fns[0])); | |
d3d81eb2 | 308 | /* Emit them now that the thunks are same comdat group aliases. */ |
309 | if (!save_defer_mangling_aliases) | |
310 | generate_mangling_aliases (); | |
468088ac | 311 | TREE_PUBLIC (fn) = false; |
312 | DECL_EXTERNAL (fn) = false; | |
313 | DECL_INTERFACE_KNOWN (fn) = true; | |
314 | /* function_and_variable_visibility doesn't want !PUBLIC decls to | |
315 | have these flags set. */ | |
316 | DECL_WEAK (fn) = false; | |
317 | DECL_COMDAT (fn) = false; | |
318 | } | |
319 | ||
320 | /* Find the vtt_parm, if present. */ | |
321 | for (vtt_parmno = -1, parmno = 0, fn_parm = DECL_ARGUMENTS (fn); | |
322 | fn_parm; | |
323 | ++parmno, fn_parm = TREE_CHAIN (fn_parm)) | |
324 | { | |
325 | if (DECL_ARTIFICIAL (fn_parm) | |
326 | && DECL_NAME (fn_parm) == vtt_parm_identifier) | |
327 | { | |
328 | /* Compensate for removed in_charge parameter. */ | |
329 | vtt_parmno = parmno; | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
334 | /* Allocate an argument buffer for build_cxx_call(). | |
335 | Make sure it is large enough for any of the clones. */ | |
336 | max_parms = 0; | |
337 | FOR_EACH_CLONE (clone, fn) | |
338 | { | |
339 | int length = list_length (DECL_ARGUMENTS (fn)); | |
340 | if (length > max_parms) | |
341 | max_parms = length; | |
342 | } | |
4611960c | 343 | args = XALLOCAVEC (tree, max_parms); |
468088ac | 344 | |
ab87ee8f | 345 | /* We know that any clones immediately follow FN in TYPE_FIELDS. */ |
468088ac | 346 | FOR_EACH_CLONE (clone, fn) |
347 | { | |
348 | tree clone_parm; | |
349 | ||
350 | /* If we've already generated a body for this clone, avoid | |
351 | duplicating it. (Is it possible for a clone-list to grow after we | |
352 | first see it?) */ | |
353 | if (DECL_SAVED_TREE (clone) || TREE_ASM_WRITTEN (clone)) | |
354 | continue; | |
355 | ||
356 | /* Start processing the function. */ | |
357 | start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED); | |
358 | ||
359 | if (clone == fns[2]) | |
360 | { | |
361 | for (clone_parm = DECL_ARGUMENTS (clone); clone_parm; | |
362 | clone_parm = TREE_CHAIN (clone_parm)) | |
363 | DECL_ABSTRACT_ORIGIN (clone_parm) = NULL_TREE; | |
364 | /* Build the delete destructor by calling complete destructor and | |
365 | delete function. */ | |
366 | build_delete_destructor_body (clone, fns[1]); | |
367 | } | |
368 | else | |
369 | { | |
370 | /* Walk parameter lists together, creating parameter list for | |
371 | call to original function. */ | |
372 | for (parmno = 0, | |
373 | fn_parm = DECL_ARGUMENTS (fn), | |
374 | fn_parm_typelist = TYPE_ARG_TYPES (TREE_TYPE (fn)), | |
375 | clone_parm = DECL_ARGUMENTS (clone); | |
376 | fn_parm; | |
377 | ++parmno, | |
378 | fn_parm = TREE_CHAIN (fn_parm)) | |
379 | { | |
380 | if (parmno == vtt_parmno && ! DECL_HAS_VTT_PARM_P (clone)) | |
381 | { | |
382 | gcc_assert (fn_parm_typelist); | |
383 | /* Clobber argument with formal parameter type. */ | |
384 | args[parmno] | |
385 | = convert (TREE_VALUE (fn_parm_typelist), | |
386 | null_pointer_node); | |
387 | } | |
388 | else if (parmno == 1 && DECL_HAS_IN_CHARGE_PARM_P (fn)) | |
389 | { | |
390 | tree in_charge | |
391 | = copy_node (in_charge_arg_for_name (DECL_NAME (clone))); | |
392 | args[parmno] = in_charge; | |
393 | } | |
394 | /* Map other parameters to their equivalents in the cloned | |
395 | function. */ | |
396 | else | |
397 | { | |
398 | gcc_assert (clone_parm); | |
399 | DECL_ABSTRACT_ORIGIN (clone_parm) = NULL; | |
400 | args[parmno] = clone_parm; | |
401 | clone_parm = TREE_CHAIN (clone_parm); | |
402 | } | |
403 | if (fn_parm_typelist) | |
404 | fn_parm_typelist = TREE_CHAIN (fn_parm_typelist); | |
405 | } | |
406 | ||
407 | /* We built this list backwards; fix now. */ | |
408 | mark_used (fn); | |
409 | call = build_cxx_call (fn, parmno, args, tf_warning_or_error); | |
410 | /* Arguments passed to the thunk by invisible reference should | |
411 | be transmitted to the callee unchanged. Do not create a | |
412 | temporary and invoke the copy constructor. The thunking | |
413 | transformation must not introduce any constructor calls. */ | |
414 | CALL_FROM_THUNK_P (call) = 1; | |
415 | block = make_node (BLOCK); | |
416 | if (targetm.cxx.cdtor_returns_this ()) | |
417 | { | |
418 | clone_result = DECL_RESULT (clone); | |
419 | modify = build2 (MODIFY_EXPR, TREE_TYPE (clone_result), | |
420 | clone_result, call); | |
7663e4b8 | 421 | modify = build1 (RETURN_EXPR, void_type_node, modify); |
468088ac | 422 | add_stmt (modify); |
468088ac | 423 | } |
424 | else | |
425 | { | |
426 | add_stmt (call); | |
427 | } | |
428 | bind = c_build_bind_expr (DECL_SOURCE_LOCATION (clone), | |
429 | block, cur_stmt_list); | |
430 | DECL_SAVED_TREE (clone) = push_stmt_list (); | |
431 | add_stmt (bind); | |
432 | } | |
433 | ||
434 | DECL_ABSTRACT_ORIGIN (clone) = NULL; | |
4775c814 | 435 | expand_or_defer_fn (finish_function (/*inline_p=*/false)); |
468088ac | 436 | } |
437 | return 1; | |
438 | } | |
439 | ||
440 | /* FN is a function that has a complete body. Clone the body as | |
441 | necessary. Returns nonzero if there's no longer any need to | |
442 | process the main body. */ | |
443 | ||
444 | bool | |
445 | maybe_clone_body (tree fn) | |
446 | { | |
447 | tree comdat_group = NULL_TREE; | |
448 | tree clone; | |
449 | tree fns[3]; | |
450 | bool first = true; | |
451 | int idx; | |
452 | bool need_alias = false; | |
453 | ||
454 | /* We only clone constructors and destructors. */ | |
c6e04fca | 455 | if (!DECL_MAYBE_IN_CHARGE_CDTOR_P (fn)) |
468088ac | 456 | return 0; |
457 | ||
458 | populate_clone_array (fn, fns); | |
e2932b0d | 459 | |
a2ad849c | 460 | /* Remember if we can't have multiple clones for some reason. We need to |
461 | check this before we remap local static initializers in clone_body. */ | |
462 | if (!tree_versionable_function_p (fn)) | |
463 | need_alias = true; | |
464 | ||
ab87ee8f | 465 | /* We know that any clones immediately follow FN in the TYPE_FIELDS |
e55cba4c | 466 | list. */ |
93c149df | 467 | push_to_top_level (); |
ed772161 | 468 | for (idx = 0; idx < 3; idx++) |
e55cba4c | 469 | { |
470 | tree parm; | |
471 | tree clone_parm; | |
e55cba4c | 472 | |
ed772161 | 473 | clone = fns[idx]; |
474 | if (!clone) | |
475 | continue; | |
476 | ||
e55cba4c | 477 | /* Update CLONE's source position information to match FN's. */ |
346064d9 | 478 | DECL_SOURCE_LOCATION (clone) = DECL_SOURCE_LOCATION (fn); |
d3981643 | 479 | DECL_DECLARED_INLINE_P (clone) = DECL_DECLARED_INLINE_P (fn); |
611b6173 | 480 | DECL_DECLARED_CONSTEXPR_P (clone) = DECL_DECLARED_CONSTEXPR_P (fn); |
0ce25b06 | 481 | DECL_COMDAT (clone) = DECL_COMDAT (fn); |
482 | DECL_WEAK (clone) = DECL_WEAK (fn); | |
ecd88073 | 483 | |
484 | /* We don't copy the comdat group from fn to clone because the assembler | |
485 | name of fn was corrupted by write_mangled_name by adding *INTERNAL* | |
486 | to it. By doing so, it also corrupted the comdat group. */ | |
487 | if (DECL_ONE_ONLY (fn)) | |
415d1b9a | 488 | cgraph_node::get_create (clone)->set_comdat_group (cxx_comdat_group (clone)); |
f753592a | 489 | DECL_USE_TEMPLATE (clone) = DECL_USE_TEMPLATE (fn); |
490 | DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn); | |
491 | DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn); | |
492 | DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn); | |
3418ec43 | 493 | TREE_PUBLIC (clone) = TREE_PUBLIC (fn); |
9c40570a | 494 | DECL_VISIBILITY (clone) = DECL_VISIBILITY (fn); |
b212f378 | 495 | DECL_VISIBILITY_SPECIFIED (clone) = DECL_VISIBILITY_SPECIFIED (fn); |
578887bb | 496 | DECL_DLLIMPORT_P (clone) = DECL_DLLIMPORT_P (fn); |
8514bbf4 | 497 | DECL_ATTRIBUTES (clone) = copy_list (DECL_ATTRIBUTES (fn)); |
498 | DECL_DISREGARD_INLINE_LIMITS (clone) = DECL_DISREGARD_INLINE_LIMITS (fn); | |
71e19e54 | 499 | set_decl_section_name (clone, DECL_SECTION_NAME (fn)); |
e55cba4c | 500 | |
47cd6605 | 501 | /* Adjust the parameter names and locations. */ |
17d36341 | 502 | parm = DECL_ARGUMENTS (fn); |
503 | clone_parm = DECL_ARGUMENTS (clone); | |
4cb90235 | 504 | /* Update the `this' parameter, which is always first. */ |
ff64eef0 | 505 | update_cloned_parm (parm, clone_parm, first); |
1767a056 | 506 | parm = DECL_CHAIN (parm); |
507 | clone_parm = DECL_CHAIN (clone_parm); | |
17d36341 | 508 | if (DECL_HAS_IN_CHARGE_PARM_P (fn)) |
1767a056 | 509 | parm = DECL_CHAIN (parm); |
17d36341 | 510 | if (DECL_HAS_VTT_PARM_P (fn)) |
1767a056 | 511 | parm = DECL_CHAIN (parm); |
17d36341 | 512 | if (DECL_HAS_VTT_PARM_P (clone)) |
1767a056 | 513 | clone_parm = DECL_CHAIN (clone_parm); |
7896267d | 514 | for (; parm && clone_parm; |
1767a056 | 515 | parm = DECL_CHAIN (parm), clone_parm = DECL_CHAIN (clone_parm)) |
0767cba9 | 516 | /* Update this parameter. */ |
ff64eef0 | 517 | update_cloned_parm (parm, clone_parm, first); |
468088ac | 518 | } |
519 | ||
520 | bool can_alias = can_alias_cdtor (fn); | |
521 | ||
522 | /* If we decide to turn clones into thunks, they will branch to fn. | |
523 | Must have original function available to call. */ | |
524 | if (!can_alias && maybe_thunk_body (fn, need_alias)) | |
525 | { | |
526 | pop_from_top_level (); | |
527 | /* We still need to emit the original function. */ | |
528 | return 0; | |
529 | } | |
530 | ||
531 | /* Emit the DWARF1 abstract instance. */ | |
532 | (*debug_hooks->deferred_inline_function) (fn); | |
533 | ||
ab87ee8f | 534 | /* We know that any clones immediately follow FN in the TYPE_FIELDS. */ |
468088ac | 535 | for (idx = 0; idx < 3; idx++) |
536 | { | |
537 | tree parm; | |
538 | tree clone_parm; | |
539 | int parmno; | |
06ecf488 | 540 | hash_map<tree, tree> *decl_map; |
468088ac | 541 | bool alias = false; |
542 | ||
543 | clone = fns[idx]; | |
544 | if (!clone) | |
545 | continue; | |
17d36341 | 546 | |
e55cba4c | 547 | /* Start processing the function. */ |
3046c0a3 | 548 | start_preparsed_function (clone, NULL_TREE, SF_PRE_PARSED); |
e55cba4c | 549 | |
ed772161 | 550 | /* Tell cgraph if both ctors or both dtors are known to have |
551 | the same body. */ | |
468088ac | 552 | if (can_alias |
ed772161 | 553 | && fns[0] |
554 | && idx == 1 | |
415d1b9a | 555 | && cgraph_node::get_create (fns[0])->create_same_body_alias |
556 | (clone, fns[0])) | |
28454517 | 557 | { |
558 | alias = true; | |
1d4ef5e7 | 559 | if (DECL_ONE_ONLY (fns[0])) |
560 | { | |
561 | /* For comdat base and complete cdtors put them | |
562 | into the same, *[CD]5* comdat group instead of | |
563 | *[CD][12]*. */ | |
564 | comdat_group = cdtor_comdat_group (fns[1], fns[0]); | |
415d1b9a | 565 | cgraph_node::get_create (fns[0])->set_comdat_group (comdat_group); |
566 | if (symtab_node::get (clone)->same_comdat_group) | |
567 | symtab_node::get (clone)->remove_from_same_comdat_group (); | |
568 | symtab_node::get (clone)->add_to_same_comdat_group | |
569 | (symtab_node::get (fns[0])); | |
1d4ef5e7 | 570 | } |
28454517 | 571 | } |
ed772161 | 572 | |
e2932b0d | 573 | /* Build the delete destructor by calling complete destructor |
574 | and delete function. */ | |
ed772161 | 575 | if (idx == 2) |
dabebf7e | 576 | { |
577 | build_delete_destructor_body (clone, fns[1]); | |
578 | /* If *[CD][12]* dtors go into the *[CD]5* comdat group and dtor is | |
579 | virtual, it goes into the same comdat group as well. */ | |
580 | if (comdat_group) | |
415d1b9a | 581 | cgraph_node::get_create (clone)->add_to_same_comdat_group |
582 | (symtab_node::get (fns[0])); | |
dabebf7e | 583 | } |
ed772161 | 584 | else if (alias) |
585 | /* No need to populate body. */ ; | |
e2932b0d | 586 | else |
ed772161 | 587 | { |
a2ad849c | 588 | /* If we can't have multiple copies of FN (say, because there's a |
589 | static local initialized with the address of a label), we need | |
590 | to use an alias for the complete variant. */ | |
591 | if (idx == 1 && need_alias) | |
592 | { | |
593 | if (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_set) | |
594 | sorry (DECL_STRUCT_FUNCTION (fn)->cannot_be_copied_reason, fn); | |
595 | else | |
596 | sorry ("making multiple clones of %qD", fn); | |
597 | } | |
598 | ||
e2932b0d | 599 | /* Remap the parameters. */ |
06ecf488 | 600 | decl_map = new hash_map<tree, tree>; |
e2932b0d | 601 | for (parmno = 0, |
602 | parm = DECL_ARGUMENTS (fn), | |
603 | clone_parm = DECL_ARGUMENTS (clone); | |
604 | parm; | |
605 | ++parmno, | |
1767a056 | 606 | parm = DECL_CHAIN (parm)) |
e2932b0d | 607 | { |
608 | /* Map the in-charge parameter to an appropriate constant. */ | |
609 | if (DECL_HAS_IN_CHARGE_PARM_P (fn) && parmno == 1) | |
610 | { | |
611 | tree in_charge; | |
612 | in_charge = in_charge_arg_for_name (DECL_NAME (clone)); | |
06ecf488 | 613 | decl_map->put (parm, in_charge); |
e2932b0d | 614 | } |
615 | else if (DECL_ARTIFICIAL (parm) | |
616 | && DECL_NAME (parm) == vtt_parm_identifier) | |
617 | { | |
618 | /* For a subobject constructor or destructor, the next | |
619 | argument is the VTT parameter. Remap the VTT_PARM | |
620 | from the CLONE to this parameter. */ | |
621 | if (DECL_HAS_VTT_PARM_P (clone)) | |
622 | { | |
623 | DECL_ABSTRACT_ORIGIN (clone_parm) = parm; | |
06ecf488 | 624 | decl_map->put (parm, clone_parm); |
1767a056 | 625 | clone_parm = DECL_CHAIN (clone_parm); |
e2932b0d | 626 | } |
627 | /* Otherwise, map the VTT parameter to `NULL'. */ | |
628 | else | |
06ecf488 | 629 | { |
630 | tree t | |
631 | = fold_convert (TREE_TYPE (parm), null_pointer_node); | |
632 | decl_map->put (parm, t); | |
633 | } | |
e2932b0d | 634 | } |
635 | /* Map other parameters to their equivalents in the cloned | |
636 | function. */ | |
637 | else | |
638 | { | |
bfd3584e | 639 | tree replacement; |
7896267d | 640 | if (clone_parm) |
bfd3584e | 641 | { |
642 | replacement = clone_parm; | |
643 | clone_parm = DECL_CHAIN (clone_parm); | |
644 | } | |
645 | else | |
646 | { | |
647 | /* Inheriting ctors can omit parameters from the base | |
648 | clone. Replace them with null lvalues. */ | |
649 | tree reftype = build_reference_type (TREE_TYPE (parm)); | |
650 | replacement = fold_convert (reftype, null_pointer_node); | |
651 | replacement = convert_from_reference (replacement); | |
652 | } | |
653 | decl_map->put (parm, replacement); | |
e2932b0d | 654 | } |
655 | } | |
656 | ||
657 | if (targetm.cxx.cdtor_returns_this ()) | |
658 | { | |
659 | parm = DECL_RESULT (fn); | |
660 | clone_parm = DECL_RESULT (clone); | |
06ecf488 | 661 | decl_map->put (parm, clone_parm); |
e2932b0d | 662 | } |
663 | ||
664 | /* Clone the body. */ | |
665 | clone_body (clone, fn, decl_map); | |
666 | ||
667 | /* Clean up. */ | |
06ecf488 | 668 | delete decl_map; |
e2932b0d | 669 | } |
e55cba4c | 670 | |
95cedffb | 671 | /* The clone can throw iff the original function can throw. */ |
672 | cp_function_chain->can_throw = !TREE_NOTHROW (fn); | |
673 | ||
e55cba4c | 674 | /* Now, expand this function into RTL, if appropriate. */ |
4775c814 | 675 | finish_function (/*inline_p=*/false); |
8f80e66d | 676 | BLOCK_ABSTRACT_ORIGIN (DECL_INITIAL (clone)) = DECL_INITIAL (fn); |
ed772161 | 677 | if (alias) |
9358725b | 678 | { |
679 | if (expand_or_defer_fn_1 (clone)) | |
680 | emit_associated_thunks (clone); | |
6a385150 | 681 | /* We didn't generate a body, so remove the empty one. */ |
682 | DECL_SAVED_TREE (clone) = NULL_TREE; | |
9358725b | 683 | } |
ed772161 | 684 | else |
685 | expand_or_defer_fn (clone); | |
ff64eef0 | 686 | first = false; |
e55cba4c | 687 | } |
93c149df | 688 | pop_from_top_level (); |
4d26ca8c | 689 | |
e55cba4c | 690 | /* We don't need to process the original function any further. */ |
691 | return 1; | |
692 | } |