PR lto/83954
[official-gcc.git] / gcc / objc / objc-runtime-shared-support.c
blobf90efb605ec597b6a5c6565055574be38abd6926
1 /* Support routines shared by all runtimes.
2 Copyright (C) 2011-2018 Free Software Foundation, Inc.
3 Contributed by Iain Sandoe (partially split from objc-act.c)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "stringpool.h"
27 #ifdef OBJCPLUS
28 #include "cp/cp-tree.h"
29 #else
30 #include "c/c-tree.h"
31 #include "c/c-lang.h"
32 #endif
33 #include "c-family/c-objc.h"
34 #include "objc-act.h"
36 /* When building Objective-C++, we are not linking against the C front-end
37 and so need to replicate the C tree-construction functions in some way. */
38 #ifdef OBJCPLUS
39 #define OBJCP_REMAP_FUNCTIONS
40 #include "objcp-decl.h"
41 #endif /* OBJCPLUS */
43 /* Hooks for string decls etc. */
44 #include "objc-runtime-hooks.h"
46 #include "objc-runtime-shared-support.h"
47 #include "objc-encoding.h"
49 /* rt_trees identifiers - shared between NeXT implementations. These allow
50 the FE to tag meta-data in a manner that survives LTO and can be used when
51 the runtime requires that certain meta-data items appear in particular
52 named sections. */
53 #include "objc-next-metadata-tags.h"
54 extern GTY(()) tree objc_rt_trees[OCTI_RT_META_MAX];
56 /* Rather than repeatedly looking up the identifiers, we save them here. */
57 tree objc_rt_trees[OCTI_RT_META_MAX];
59 /* For building an objc struct. These might not be used when this file
60 is compiled as part of obj-c++. */
62 static bool objc_building_struct;
63 static struct c_struct_parse_info *objc_struct_info ATTRIBUTE_UNUSED;
65 /* Start building a struct for objc. */
67 tree
68 objc_start_struct (tree name)
70 gcc_assert (!objc_building_struct);
71 objc_building_struct = true;
72 return start_struct (input_location, RECORD_TYPE, name, &objc_struct_info);
75 /* Finish building a struct for objc. */
77 tree
78 objc_finish_struct (tree type, tree fieldlist)
80 gcc_assert (objc_building_struct);
81 objc_building_struct = false;
82 return finish_struct (input_location, type, fieldlist, NULL_TREE,
83 objc_struct_info);
86 tree
87 build_sized_array_type (tree base_type, int size)
89 tree index_type = build_index_type (build_int_cst (NULL_TREE, size - 1));
90 return build_array_type (base_type, index_type);
93 /* Create a declaration for field NAME of a given TYPE. */
95 static tree
96 create_field_decl (tree type, const char *name)
98 return build_decl (input_location,
99 FIELD_DECL, get_identifier (name), type);
102 tree
103 add_field_decl (tree type, const char *name, tree **chain)
105 tree field = create_field_decl (type, name);
107 if (*chain != NULL)
108 **chain = field;
109 *chain = &DECL_CHAIN (field);
111 return field;
114 /* Create a global, static declaration for variable NAME of a given TYPE. The
115 finish_var_decl() routine will need to be called on it afterwards. */
117 tree
118 start_var_decl (tree type, const char *name)
120 tree var = build_decl (input_location,
121 VAR_DECL, get_identifier (name), type);
122 TREE_STATIC (var) = 1;
123 DECL_INITIAL (var) = error_mark_node; /* A real initializer is coming... */
124 DECL_IGNORED_P (var) = 1;
125 DECL_ARTIFICIAL (var) = 1;
126 DECL_CONTEXT (var) = NULL_TREE;
127 #ifdef OBJCPLUS
128 DECL_THIS_STATIC (var) = 1; /* squash redeclaration errors */
129 #endif
130 return var;
133 /* Finish off the variable declaration created by start_var_decl(). */
135 void
136 finish_var_decl (tree var, tree initializer)
138 finish_decl (var, input_location, initializer, NULL_TREE, NULL_TREE);
141 /* Just a handy wrapper for add_objc_string. */
143 tree
144 build_selector (tree ident)
146 return convert (objc_selector_type, add_objc_string (ident, meth_var_names));
149 /* --- templates --- */
151 /* Set 'objc_super_template' to the data type node for 'struct _objc_super'.
152 This needs to be done just once per compilation. */
154 /* struct _objc_super {
155 struct _objc_object *self;
156 struct _objc_class *super_class;
157 [or Class cls; for the abi v2]
158 }; */
160 void
161 build_super_template (void)
163 tree decls, *chain = NULL;
165 objc_super_template = objc_start_struct (get_identifier (UTAG_SUPER));
167 /* struct _objc_object *self; */
168 decls = add_field_decl (objc_object_type, "self", &chain);
170 /* struct _objc_class *super_class; */
171 add_field_decl (build_pointer_type (objc_class_template),
172 "super_class", &chain);
174 objc_finish_struct (objc_super_template, decls);
177 /* To accomplish method prototyping without generating all kinds of
178 inane warnings, the definition of the dispatch table entries were
179 changed from:
181 struct objc_method { SEL _cmd; ...; id (*_imp)(); };
183 struct objc_method { SEL _cmd; ...; void *_imp; }; */
185 tree
186 build_method_template (void)
188 tree _SLT_record;
189 tree decls, *chain = NULL;
191 _SLT_record = objc_start_struct (get_identifier (UTAG_METHOD));
193 /* SEL _cmd; */
194 decls = add_field_decl (objc_selector_type, "_cmd", &chain);
196 /* char *method_types; */
197 add_field_decl (string_type_node, "method_types", &chain);
199 /* void *_imp; */
200 add_field_decl (build_pointer_type (void_type_node), "_imp", &chain);
202 objc_finish_struct (_SLT_record, decls);
204 return _SLT_record;
207 tree
208 build_method_prototype_template (void)
210 tree proto_record;
211 tree decls, *chain = NULL;
213 proto_record = objc_start_struct (get_identifier (UTAG_METHOD_PROTOTYPE));
215 /* SEL _cmd; */
216 decls = add_field_decl (objc_selector_type, "_cmd", &chain);
218 /* char *method_types; */
219 add_field_decl (string_type_node, "method_types", &chain);
221 objc_finish_struct (proto_record, decls);
223 return proto_record;
226 /* struct {
227 struct _objc__method_prototype_list *method_next;
228 int method_count;
229 struct objc_method method_list[method_count];
230 }; */
232 tree
233 build_method_list_template (tree list_type, int size)
235 tree objc_ivar_list_record;
236 tree array_type, decls, *chain = NULL;
238 objc_ivar_list_record = objc_start_struct (NULL_TREE);
240 /* struct _objc__method_prototype_list *method_next; */
241 decls = add_field_decl (objc_method_proto_list_ptr, "method_next", &chain);
243 /* int method_count; */
244 add_field_decl (integer_type_node, "method_count", &chain);
246 /* struct objc_method method_list[]; */
247 array_type = build_sized_array_type (list_type, size);
248 add_field_decl (array_type, "method_list", &chain);
250 objc_finish_struct (objc_ivar_list_record, decls);
252 return objc_ivar_list_record;
255 /* struct objc_method_prototype_list {
256 int count;
257 struct objc_method_prototype {
258 SEL name;
259 char *types;
260 } list[1];
261 }; */
263 tree
264 build_method_prototype_list_template (tree list_type, int size)
266 tree objc_ivar_list_record;
267 tree array_type, decls, *chain = NULL;
269 /* Generate an unnamed struct definition. */
271 objc_ivar_list_record = objc_start_struct (NULL_TREE);
273 /* int method_count; */
274 decls = add_field_decl (integer_type_node, "method_count", &chain);
276 /* struct objc_method method_list[]; */
277 array_type = build_sized_array_type (list_type, size);
278 add_field_decl (array_type, "method_list", &chain);
280 objc_finish_struct (objc_ivar_list_record, decls);
282 return objc_ivar_list_record;
285 /* --- names, decls entry --- */
287 /* For each string section we have a chain which maps identifier nodes
288 to decls for the strings. */
290 static GTY(()) int meth_var_names_idx;
291 static GTY(()) int meth_var_types_idx;
292 static GTY(()) int property_name_attr_idx;
294 tree
295 add_objc_string (tree ident, string_section section)
297 tree *chain, decl, type;
298 char buf[BUFSIZE];
300 switch (section)
302 case class_names:
303 chain = &class_names_chain;
304 snprintf (buf, BUFSIZE, "_OBJC_ClassName_%s", IDENTIFIER_POINTER (ident));
305 break;
306 case meth_var_names:
307 chain = &meth_var_names_chain;
308 snprintf (buf, BUFSIZE, "_OBJC_METH_VAR_NAME_%d", meth_var_names_idx++);
309 break;
310 case meth_var_types:
311 chain = &meth_var_types_chain;
312 snprintf (buf, BUFSIZE, "_OBJC_METH_VAR_TYPE_%d", meth_var_types_idx++);
313 break;
314 case prop_names_attr:
315 chain = &prop_names_attr_chain;
316 snprintf (buf, BUFSIZE, "_OBJC_PropertyAttributeOrName_%d", property_name_attr_idx++);
317 break;
318 default:
319 gcc_unreachable ();
322 while (*chain)
324 if (TREE_VALUE (*chain) == ident)
325 return convert (string_type_node,
326 build_unary_op (input_location,
327 ADDR_EXPR, TREE_PURPOSE (*chain), 1));
329 chain = &TREE_CHAIN (*chain);
332 type = build_sized_array_type (char_type_node, IDENTIFIER_LENGTH (ident) + 1);
333 /* Get a runtime-specific string decl which will be finish_var()'ed in
334 generate_strings (). */
335 decl = (*runtime.string_decl) (type, buf, section);
336 TREE_CONSTANT (decl) = 1;
337 *chain = tree_cons (decl, ident, NULL_TREE);
339 return convert (string_type_node,
340 build_unary_op (input_location, ADDR_EXPR, decl, 1));
343 /* --- shared metadata routines --- */
345 tree
346 build_descriptor_table_initializer (tree type, tree entries)
348 vec<constructor_elt, va_gc> *inits = NULL;
352 vec<constructor_elt, va_gc> *elts = NULL;
354 CONSTRUCTOR_APPEND_ELT (elts, NULL_TREE,
355 build_selector (METHOD_SEL_NAME (entries)));
356 CONSTRUCTOR_APPEND_ELT (elts, NULL_TREE,
357 add_objc_string (METHOD_ENCODING (entries),
358 meth_var_types));
360 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE,
361 objc_build_constructor (type, elts));
363 entries = DECL_CHAIN (entries);
365 while (entries);
367 return objc_build_constructor (build_array_type (type, 0), inits);
370 tree
371 build_dispatch_table_initializer (tree type, tree entries)
373 vec<constructor_elt, va_gc> *inits = NULL;
377 vec<constructor_elt, va_gc> *elems = NULL;
378 tree expr;
380 CONSTRUCTOR_APPEND_ELT (elems, NULL_TREE,
381 build_selector (METHOD_SEL_NAME (entries)));
383 /* Generate the method encoding if we don't have one already. */
384 if (! METHOD_ENCODING (entries))
385 METHOD_ENCODING (entries) =
386 encode_method_prototype (entries);
388 CONSTRUCTOR_APPEND_ELT (elems, NULL_TREE,
389 add_objc_string (METHOD_ENCODING (entries),
390 meth_var_types));
392 expr = convert (ptr_type_node,
393 build_unary_op (input_location, ADDR_EXPR,
394 METHOD_DEFINITION (entries), 1));
395 CONSTRUCTOR_APPEND_ELT (elems, NULL_TREE, expr);
397 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE,
398 objc_build_constructor (type, elems));
400 entries = DECL_CHAIN (entries);
402 while (entries);
404 return objc_build_constructor (build_array_type (type, 0), inits);
407 /* Used only by build_*_selector_translation_table (). */
408 void
409 diagnose_missing_method (tree meth, location_t here)
411 tree method_chain;
412 bool found = false;
413 for (method_chain = meth_var_names_chain;
414 method_chain;
415 method_chain = TREE_CHAIN (method_chain))
417 if (TREE_VALUE (method_chain) == meth)
419 found = true;
420 break;
424 if (!found)
425 warning_at (here, 0, "creating selector for nonexistent method %qE",
426 meth);
430 static tree
431 init_module_descriptor (tree type, long vers)
433 tree expr, ltyp;
434 location_t loc;
435 vec<constructor_elt, va_gc> *v = NULL;
437 /* No really useful place to point to. */
438 loc = UNKNOWN_LOCATION;
440 /* version = { 1, ... } */
442 expr = build_int_cst (long_integer_type_node, vers);
443 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
445 /* size = { ..., sizeof (struct _objc_module), ... } */
447 expr = convert (long_integer_type_node,
448 size_in_bytes (objc_module_template));
449 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
451 /* Don't provide any file name for security reasons. */
452 /* name = { ..., "", ... } */
454 expr = add_objc_string (get_identifier (""), class_names);
455 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
457 /* symtab = { ..., _OBJC_SYMBOLS, ... } */
459 ltyp = build_pointer_type (xref_tag (RECORD_TYPE,
460 get_identifier (UTAG_SYMTAB)));
461 if (UOBJC_SYMBOLS_decl)
462 expr = convert (ltyp, build_unary_op (loc,
463 ADDR_EXPR, UOBJC_SYMBOLS_decl, 0));
464 else
465 expr = convert (ltyp, null_pointer_node);
466 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, expr);
468 return objc_build_constructor (type, v);
471 /* Write out the data structures to describe Objective C classes defined.
473 struct _objc_module { ... } _OBJC_MODULE = { ... }; */
475 void
476 build_module_descriptor (long vers, tree attr)
478 tree decls, *chain = NULL;
480 #ifdef OBJCPLUS
481 push_lang_context (lang_name_c); /* extern "C" */
482 #endif
484 objc_module_template = objc_start_struct (get_identifier (UTAG_MODULE));
486 /* long version; */
487 decls = add_field_decl (long_integer_type_node, "version", &chain);
489 /* long size; */
490 add_field_decl (long_integer_type_node, "size", &chain);
492 /* char *name; */
493 add_field_decl (string_type_node, "name", &chain);
495 /* struct _objc_symtab *symtab; */
496 add_field_decl (build_pointer_type (xref_tag (RECORD_TYPE,
497 get_identifier (UTAG_SYMTAB))),
498 "symtab", &chain);
500 objc_finish_struct (objc_module_template, decls);
502 /* Create an instance of "_objc_module". */
503 UOBJC_MODULES_decl = start_var_decl (objc_module_template, "_OBJC_Module");
505 /* This is the root of the metadata for defined classes and categories, it
506 is referenced by the runtime and, therefore, needed. */
507 DECL_PRESERVE_P (UOBJC_MODULES_decl) = 1;
509 /* Squash `defined but not used' warning. */
510 TREE_USED (UOBJC_MODULES_decl) = 1;
512 /* Allow the runtime to mark meta-data such that it can be assigned to target
513 specific sections by the back-end. */
514 if (attr)
515 DECL_ATTRIBUTES (UOBJC_MODULES_decl) = attr;
517 finish_var_decl (UOBJC_MODULES_decl,
518 init_module_descriptor (TREE_TYPE (UOBJC_MODULES_decl),
519 vers));
521 #ifdef OBJCPLUS
522 pop_lang_context ();
523 #endif
526 tree
527 build_ivar_list_initializer (tree type, tree field_decl)
529 vec<constructor_elt, va_gc> *inits = NULL;
531 for (; field_decl; field_decl = DECL_CHAIN (field_decl))
532 if (TREE_CODE (field_decl) == FIELD_DECL)
534 vec<constructor_elt, va_gc> *ivar = NULL;
535 tree id;
537 /* Set name. */
538 if (DECL_NAME (field_decl))
539 CONSTRUCTOR_APPEND_ELT (ivar, NULL_TREE,
540 add_objc_string (DECL_NAME (field_decl),
541 meth_var_names));
542 else
543 /* Unnamed bit-field ivar (yuck). */
544 CONSTRUCTOR_APPEND_ELT (ivar, NULL_TREE,
545 build_int_cst (NULL_TREE, 0));
547 /* Set type. */
548 id = add_objc_string (encode_field_decl (field_decl),
549 meth_var_types);
550 CONSTRUCTOR_APPEND_ELT (ivar, NULL_TREE, id);
552 /* Set offset. */
553 CONSTRUCTOR_APPEND_ELT (ivar, NULL_TREE, byte_position (field_decl));
554 CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE,
555 objc_build_constructor (type, ivar));
558 return objc_build_constructor (build_array_type (type, 0), inits);
561 /* struct {
562 int ivar_count;
563 struct objc_ivar ivar_list[ivar_count];
564 }; */
566 tree
567 build_ivar_list_template (tree list_type, int size)
569 tree objc_ivar_list_record;
570 tree array_type, decls, *chain = NULL;
572 objc_ivar_list_record = objc_start_struct (NULL_TREE);
574 /* int ivar_count; */
575 decls = add_field_decl (integer_type_node, "ivar_count", &chain);
577 /* struct objc_ivar ivar_list[]; */
578 array_type = build_sized_array_type (list_type, size);
579 add_field_decl (array_type, "ivar_list", &chain);
581 objc_finish_struct (objc_ivar_list_record, decls);
583 return objc_ivar_list_record;
586 /* struct _objc_ivar {
587 char *ivar_name;
588 char *ivar_type;
589 int ivar_offset;
590 }; */
592 tree
593 build_ivar_template (void)
595 tree objc_ivar_id, objc_ivar_record;
596 tree decls, *chain = NULL;
598 objc_ivar_id = get_identifier (UTAG_IVAR);
599 objc_ivar_record = objc_start_struct (objc_ivar_id);
601 /* char *ivar_name; */
602 decls = add_field_decl (string_type_node, "ivar_name", &chain);
604 /* char *ivar_type; */
605 add_field_decl (string_type_node, "ivar_type", &chain);
607 /* int ivar_offset; */
608 add_field_decl (integer_type_node, "ivar_offset", &chain);
610 objc_finish_struct (objc_ivar_record, decls);
612 return objc_ivar_record;
615 /* Used by NeXT ABI=0..2 */
616 void
617 build_next_selector_translation_table (void)
619 tree chain;
620 for (chain = sel_ref_chain; chain; chain = TREE_CHAIN (chain))
622 tree expr;
623 tree decl = TREE_PURPOSE (chain);
624 if (warn_selector)
626 location_t loc;
627 if (decl)
628 loc = DECL_SOURCE_LOCATION (decl);
629 else
630 loc = UNKNOWN_LOCATION;
631 diagnose_missing_method (TREE_VALUE (chain), loc);
634 expr = build_selector (TREE_VALUE (chain));
636 if (decl)
638 /* Entries of this form are used for references to methods.
639 The runtime re-writes these on start-up, but the compiler can't see
640 that and optimizes it away unless we force it. */
641 DECL_PRESERVE_P (decl) = 1;
642 finish_var_decl (decl, expr);
647 void
648 generate_protocol_references (tree plist)
650 tree lproto;
652 /* Forward declare protocols referenced. */
653 for (lproto = plist; lproto; lproto = TREE_CHAIN (lproto))
655 tree proto = TREE_VALUE (lproto);
657 if (TREE_CODE (proto) == PROTOCOL_INTERFACE_TYPE
658 && PROTOCOL_NAME (proto))
660 if (! PROTOCOL_FORWARD_DECL (proto))
661 PROTOCOL_FORWARD_DECL (proto) = (*runtime.protocol_decl) (proto);
663 if (PROTOCOL_LIST (proto))
664 generate_protocol_references (PROTOCOL_LIST (proto));
669 /* --- new routines --- */
671 /* Output all strings. */
673 /* FIXME: don't use global vars for all this... */
675 /* This emits all the meta-data string tables (and finalizes each var
676 as it goes). */
677 void
678 generate_strings (void)
680 tree chain, string_expr;
681 tree string, decl; /* , type;*/
683 for (chain = class_names_chain; chain; chain = TREE_CHAIN (chain))
685 string = TREE_VALUE (chain);
686 decl = TREE_PURPOSE (chain);
687 string_expr = my_build_string (IDENTIFIER_LENGTH (string) + 1,
688 IDENTIFIER_POINTER (string));
689 finish_var_decl (decl, string_expr);
692 for (chain = meth_var_names_chain; chain; chain = TREE_CHAIN (chain))
694 string = TREE_VALUE (chain);
695 decl = TREE_PURPOSE (chain);
696 string_expr = my_build_string (IDENTIFIER_LENGTH (string) + 1,
697 IDENTIFIER_POINTER (string));
698 finish_var_decl (decl, string_expr);
701 for (chain = meth_var_types_chain; chain; chain = TREE_CHAIN (chain))
703 string = TREE_VALUE (chain);
704 decl = TREE_PURPOSE (chain);
705 string_expr = my_build_string (IDENTIFIER_LENGTH (string) + 1,
706 IDENTIFIER_POINTER (string));
707 finish_var_decl (decl, string_expr);
710 for (chain = prop_names_attr_chain; chain; chain = TREE_CHAIN (chain))
712 string = TREE_VALUE (chain);
713 decl = TREE_PURPOSE (chain);
714 string_expr = my_build_string (IDENTIFIER_LENGTH (string) + 1,
715 IDENTIFIER_POINTER (string));
716 finish_var_decl (decl, string_expr);
720 #include "gt-objc-objc-runtime-shared-support.h"