| blob | fa753749e1a6b63f2497f529e35cdb211fca883c |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2018 Free Software Foundation, Inc.
3 Hacked by Michael Tiemann (tiemann@cygnus.com)
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/>. */
22 /* Process declarations and symbol lookup for C++ front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
52 /* Id for dumping the raw trees. */
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
88 /* A list of static class variables. This is needed, because a
89 static class variable can be declared inside the class without
90 an initializer, and then initialized, statically, outside the class. */
93 /* A list of functions which were declared inline, but which we
94 may need to emit outline anyway. */
97 /* A list of decls that use types with no linkage, which we need to make
98 sure are defined. */
101 /* A vector of alternating decls and identifiers, where the latter
102 is to be an alias for the former if the former is defined. */
105 /* hash traits for declarations. Hashes single decls via
106 DECL_ASSEMBLER_NAME_RAW. */
109 {
114 {
116 }
118 {
121 }
127 {
129 }
131 {
133 }
134 };
136 /* A hash table of decls keyed by mangled name. Used to figure out if
137 we need compatibility aliases. */
140 /* Nonzero if we're done parsing and into end-of-file activities. */
144 /* True if note_mangling_alias should enqueue mangling aliases for
145 later generation, rather than emitting them right away. */
148 \f
150 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
151 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
152 that apply to the function). */
154 tree
156 cp_ref_qualifier rqual)
157 {
158 tree raises;
159 tree attrs;
188 }
190 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
191 return type changed to NEW_RET. */
193 tree
195 {
196 tree newtype;
209 {
214 }
215 else
216 newtype = build_method_type_directly
228 }
230 /* Build a PARM_DECL of FN with NAME and TYPE, and set DECL_ARG_TYPE
231 appropriately. */
233 tree
235 {
240 /* DECL_ARG_TYPE is only used by the back end and the back end never
241 sees templates. */
246 }
248 /* Returns a PARM_DECL of FN for a parameter of the indicated TYPE, with the
249 indicated NAME. */
251 tree
253 {
256 /* All our artificial parms are implicitly `const'; they cannot be
257 assigned to. */
260 }
262 /* Constructors for types with virtual baseclasses need an "in-charge" flag
263 saying whether this constructor is responsible for initialization of
264 virtual baseclasses or not. All destructors also need this "in-charge"
265 flag, which additionally determines whether or not the destructor should
266 free the memory for the object.
268 This function adds the "in-charge" flag to member function FN if
269 appropriate. It is called from grokclassfn and tsubst.
270 FN must be either a constructor or destructor.
272 The in-charge flag follows the 'this' parameter, and is followed by the
273 VTT parm (if any), then the user-written parms. */
275 void
277 {
280 /* If we've already add the in-charge parameter don't do it again. */
284 /* When processing templates we can't know, in general, whether or
285 not we're going to have virtual baseclasses. */
289 /* We don't need an in-charge parameter for constructors that don't
290 have virtual bases. */
301 /* If this is a subobject constructor or destructor, our caller will
302 pass us a pointer to our VTT. */
304 {
307 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
311 /* ...and then to TYPE_ARG_TYPES. */
315 }
317 /* Then add the in-charge parm (before the VTT parm). */
323 /* Insert our new parameter(s) into the list. */
326 /* And rebuild the function type. */
328 arg_types);
333 fntype = (cp_build_type_attribute_variant
337 /* Now we've got the in-charge parameter. */
339 }
341 /* Classes overload their constituent function names automatically.
342 When a function name is declared in a record structure,
343 its name is changed to it overloaded name. Since names for
344 constructors and destructors can conflict, we place a leading
345 '$' for destructors.
347 CNAME is the name of the class we are grokking for.
349 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
351 FLAGS contains bits saying what's special about today's
352 arguments. DTOR_FLAG == DESTRUCTOR.
354 If FUNCTION is a destructor, then we must add the `auto-delete' field
355 as a second parameter. There is some hair associated with the fact
356 that we must "declare" this variable in the manner consistent with the
357 way the rest of the arguments were declared.
359 QUALS are the qualifiers for the this pointer. */
361 void
363 {
366 /* Even within an `extern "C"' block, members get C++ linkage. See
367 [dcl.link] for details. */
371 {
375 }
384 }
386 /* Create an ARRAY_REF, checking for the user doing things backwards
387 along the way. DECLTYPE_P is for N3276, as in the parser. */
389 tree
392 {
393 tree type;
394 tree expr;
403 {
410 }
416 /* If they have an `operator[]', use that. */
418 {
424 }
425 else
426 {
429 /* Otherwise, create an ARRAY_REF for a pointer or array type.
430 It is a little-known fact that, if `a' is an array and `i' is
431 an int, you can write `i[a]', which means the same thing as
432 `a[i]'. */
435 else
440 else
455 else
456 {
460 }
467 else
471 }
473 {
480 }
482 }
484 /* Given the cast expression EXP, checking out its validity. Either return
485 an error_mark_node if there was an unavoidable error, return a cast to
486 void for trying to delete a pointer w/ the value 0, or return the
487 call to delete. If DOING_VEC is true, we handle things differently
488 for doing an array delete.
489 Implements ARM $5.3.4. This is called from the parser. */
491 tree
493 tsubst_flags_t complain)
494 {
501 {
507 }
509 /* An array can't have been allocated by new, so complain. */
516 {
520 }
524 /* As of Valley Forge, you can delete a pointer to const. */
526 /* You can't delete functions. */
528 {
532 }
534 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
536 {
539 }
541 /* Deleting a pointer with the value zero is valid and has no effect. */
547 sfk_deleting_destructor,
549 else
552 complain);
553 }
555 /* Report an error if the indicated template declaration is not the
556 sort of thing that should be a member template. */
558 void
560 {
561 tree decl;
570 {
571 /* The parser rejects template declarations in local classes
572 (with the exception of generic lambdas). */
574 /* The parser rejects any use of virtual in a function template. */
578 /* The debug-information generating code doesn't know what to do
579 with member templates. */
581 }
584 else
586 }
588 /* Sanity check: report error if this function FUNCTION is not
589 really a member of the class (CTYPE) it is supposed to belong to.
590 TEMPLATE_PARMS is used to specify the template parameters of a member
591 template passed as FUNCTION_DECL. If the member template is passed as a
592 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
593 from the declaration. If the function is not a function template, it
594 must be NULL.
595 It returns the original declaration for the function, NULL_TREE if
596 no declaration was found, error_mark_node if an error was emitted. */
598 tree
600 {
605 /* Since this is a specialization of a member template,
606 we're not going to find the declaration in the class.
607 For example, in:
609 struct S { template <typename T> void f(T); };
610 template <> void S::f(int);
612 we're not going to find `S::f(int)', but there's no
613 reason we should, either. We let our callers know we didn't
614 find the method, but we don't complain. */
617 /* Basic sanity check: for a template function, the template parameters
618 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
620 {
624 {
628 }
630 }
632 /* OK, is this a definition of a member template? */
635 /* [temp.mem]
637 A destructor shall not be a member template. */
639 {
642 }
644 /* We must enter the scope here, because conversion operators are
645 named by target type, and type equivalence relies on typenames
646 resolving within the scope of CTYPE. */
652 {
655 /* A member template definition only matches a member template
656 declaration. */
666 /* We cannot simply call decls_match because this doesn't work
667 for static member functions that are pretending to be
668 methods, and because the name may have been changed by
669 asm("new_name"). */
671 /* Get rid of the this parameter on functions that become
672 static. */
677 /* ref-qualifier or absence of same must match. */
682 // Include constraints in the match.
686 /* While finding a match, same types and params are not enough
687 if the function is versioned. Also check version ("target")
688 attributes. */
693 && (!is_template
702 }
705 {
708 else
709 {
720 else
725 }
727 }
733 }
735 /* DECL is a function with vague linkage. Remember it so that at the
736 end of the translation unit we can decide whether or not to emit
737 it. */
739 void
741 {
747 }
749 /* As above, but for variable template instantiations. */
751 void
753 {
755 }
757 /* We have just processed the DECL, which is a static data member.
758 The other parameters are as for cp_finish_decl. */
760 void
763 tree asmspec_tree,
765 {
768 /* We cannot call pushdecl here, because that would fill in the
769 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
770 the right thing, namely, to put this decl out straight away. */
776 /* We already complained about the template definition. */
780 else
784 {
790 }
799 {
800 /* Similarly to start_decl_1, we want to complete the type in order
801 to do the right thing in cp_apply_type_quals_to_decl, possibly
802 clear TYPE_QUAL_CONST (c++/65579). */
805 }
808 }
810 /* DECLARATOR and DECLSPECS correspond to a class member. The other
811 parameters are as for cp_finish_decl. Return the DECL for the
812 class member declared. */
814 tree
818 tree asmspec_tree,
819 tree attrlist)
820 {
821 tree value;
824 tree name;
834 /* friend or constructor went bad. */
840 {
843 }
845 /* Pass friendly classes back. */
853 {
855 {
858 }
863 value);
864 }
866 /* Stash away type declarations. */
868 {
873 {
876 /* If this is a typedef that names the class for linkage purposes
877 (7.1.3p8), apply any attributes directly to the type. */
883 }
890 /* It's important that push_template_decl below follows
891 set_underlying_type above so that the created template
892 carries the properly set type of VALUE. */
898 }
903 {
906 }
912 {
914 {
916 {
918 {
922 }
923 else
924 {
928 }
929 }
931 {
933 {
937 }
938 }
942 {
947 else
949 value);
950 }
951 else
952 {
956 value);
957 else
959 value);
960 }
961 }
966 }
968 /* Pass friend decls back. */
974 /* Need to set this before push_template_decl. */
979 {
983 }
990 else
994 {
1019 /* Pass friends back this way. */
1028 }
1030 }
1032 /* Like `grokfield', but for bitfields.
1033 WIDTH is the width of the bitfield, a constant expression.
1034 The other parameters are as for grokfield. */
1036 tree
1039 tree attrlist)
1040 {
1049 /* Pass friendly classes back. */
1056 {
1059 }
1062 {
1065 }
1067 /* Usually, finish_struct_1 catches bitfields with invalid types.
1068 But, in the case of bitfields with function type, we confuse
1069 ourselves into thinking they are member functions, so we must
1070 check here. */
1072 {
1076 }
1079 {
1083 }
1086 {
1090 }
1093 {
1096 }
1104 {
1105 /* The width must be an integer type. */
1110 else
1111 {
1112 /* Temporarily stash the width in DECL_BIT_FIELD_REPRESENTATIVE.
1113 check_bitfield_decl picks it from there later and sets DECL_SIZE
1114 accordingly. */
1117 }
1118 }
1126 }
1128 \f
1129 /* Returns true iff ATTR is an attribute which needs to be applied at
1130 instantiation time rather than template definition time. */
1132 static bool
1134 {
1138 tree arg;
1141 /* Unknown attribute. */
1144 /* Attribute weak handling wants to write out assembly right away. */
1148 /* Attributes used and unused are applied directly, as they appertain to
1149 decls. */
1154 /* Attribute tls_model wants to modify the symtab. */
1158 /* #pragma omp declare simd attribute needs to be always deferred. */
1163 /* An attribute pack is clearly dependent. */
1167 /* If any of the arguments are dependent expressions, we can't evaluate
1168 the attribute until instantiation time. */
1170 {
1173 /* If the first attribute argument is an identifier, only consider
1174 second and following arguments. Attributes like mode, format,
1175 cleanup and several target specific attributes aren't late
1176 just because they have an IDENTIFIER_NODE as first argument. */
1184 }
1189 {
1192 /* We can't apply any attributes to a completely unknown type until
1193 instantiation time. */
1199 /* Also defer most attributes on dependent types. This is not
1200 necessary in all cases, but is the better default. */
1202 /* But some attributes specifically apply to templates. */
1207 else
1209 }
1210 else
1212 }
1214 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1215 applied at instantiation time and return them. If IS_DEPENDENT is true,
1216 the declaration itself is dependent, so all attributes should be applied
1217 at instantiation time. */
1219 static tree
1221 {
1230 {
1232 {
1238 }
1239 else
1241 }
1244 }
1246 /* Remove any late attributes from the list in ATTR_P and attach them to
1247 DECL_P. */
1249 static void
1251 {
1263 else
1268 /* Merge the late attributes at the beginning with the attribute
1269 list. */
1274 {
1277 else
1278 {
1281 }
1282 }
1283 else
1287 {
1288 /* We've added new attributes directly to the main variant, so
1289 now we need to update all of the other variants to include
1290 these new attributes. */
1291 tree variant;
1294 {
1297 }
1298 }
1299 }
1301 /* True if ATTRS contains any dependent attributes that affect type
1302 identity. */
1304 bool
1306 {
1309 {
1313 }
1315 }
1317 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1318 to a typedef which gives a previously unnamed class or enum a name for
1319 linkage purposes. */
1321 bool
1323 {
1325 {
1329 }
1331 }
1333 /* Like reconstruct_complex_type, but handle also template trees. */
1335 tree
1337 {
1342 {
1346 }
1348 {
1352 }
1354 {
1357 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1358 element type qualification will be handled by the recursive
1359 cp_reconstruct_complex_type call and cp_build_qualified_type
1360 for ARRAY_TYPEs changes the element type. */
1362 }
1364 {
1371 }
1373 {
1376 /* The build_method_type_directly() routine prepends 'this' to argument list,
1377 so we must compensate by getting rid of it. */
1378 outer
1379 = build_method_type_directly
1382 }
1384 {
1387 }
1388 else
1399 }
1401 /* Replaces any constexpr expression that may be into the attributes
1402 arguments with their reduced value. */
1404 static void
1406 {
1410 tree attr;
1412 {
1413 tree arg;
1415 {
1419 }
1420 }
1421 }
1423 /* Return true if TYPE is an OpenMP mappable type. */
1424 bool
1426 {
1427 /* Mappable type has to be complete. */
1430 /* Arrays have mappable type if the elements have mappable type. */
1433 /* A mappable type cannot contain virtual members. */
1436 /* All data members must be non-static. */
1438 {
1439 tree field;
1443 /* All fields must have mappable types. */
1447 }
1449 }
1451 /* Return the last pushed declaration for the symbol DECL or NULL
1452 when no such declaration exists. */
1454 static tree
1456 {
1460 {
1461 /* Look up the declaration in its scope. */
1471 /* The declaration may be a member conversion operator
1472 or a bunch of overfloads (handle the latter below). */
1475 }
1481 {
1482 /* A set of overloads of the same function. */
1484 {
1490 }
1492 }
1495 }
1497 /* Like decl_attributes, but handle C++ complexity. */
1499 void
1501 {
1506 /* Add implicit "omp declare target" attribute if requested. */
1511 {
1521 else
1524 }
1527 {
1532 }
1540 {
1541 attributes
1545 }
1546 else
1547 {
1550 }
1555 /* Propagate deprecation out to the template. */
1558 {
1564 }
1565 }
1566 \f
1567 /* Walks through the namespace- or function-scope anonymous union
1568 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1569 Returns one of the fields for use in the mangled name. */
1571 static tree
1573 {
1575 tree field;
1577 /* Rather than write the code to handle the non-union case,
1578 just give an error. */
1580 {
1583 }
1588 {
1589 tree decl;
1590 tree ref;
1595 {
1597 "%q#D invalid; an anonymous union can only "
1600 }
1612 else
1617 {
1618 tree base;
1634 }
1637 else
1642 }
1645 }
1647 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1648 anonymous union, then all members must be laid out together. PUBLIC_P
1649 is nonzero if this union is not declared static. */
1651 void
1653 {
1654 tree type;
1655 tree main_decl;
1664 /* The VAR_DECL's context is the same as the TYPE's context. */
1671 {
1674 }
1680 {
1683 }
1686 {
1687 /* Use main_decl to set the mangled name. */
1693 }
1697 }
1698 \f
1699 /* Auxiliary functions to make type signatures for
1700 `operator new' and `operator delete' correspond to
1701 what compiler will be expecting. */
1703 tree
1705 {
1712 {
1715 }
1718 {
1720 {
1721 /* [basic.stc.dynamic.allocation]
1723 The first parameter shall not have an associated default
1724 argument. */
1727 /* Throw away the default argument. */
1729 }
1732 {
1735 }
1736 }
1737 else
1745 {
1748 /* Fall through. */
1750 type = build_exception_variant
1753 /* Fall through. */
1755 }
1757 }
1759 tree
1761 {
1768 {
1771 }
1775 {
1780 ptr_type_node);
1781 }
1783 {
1786 /* Fall through. */
1788 type = build_exception_variant
1791 /* Fall through. */
1793 }
1796 }
1797 \f
1798 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1799 and mark them as needed. */
1801 static void
1803 {
1804 tree fnaddr;
1807 /* It's OK for the vtable to refer to deprecated virtual functions. */
1812 {
1813 tree fn;
1819 /* This entry is an offset: a virtual base class offset, a
1820 virtual call offset, an RTTI offset, etc. */
1825 /* When we don't have vcall offsets, we output thunks whenever
1826 we output the vtables that contain them. With vcall offsets,
1827 we know all the thunks we'll need when we emit a virtual
1828 function, so we emit the thunks there instead. */
1831 /* Set the location, as marking the function could cause
1832 instantiation. We do not need to preserve the incoming
1833 location, as we're called from c_parse_final_cleanups, which
1834 takes care of that. */
1837 }
1838 }
1840 /* Set DECL up to have the closest approximation of "initialized common"
1841 linkage available. */
1843 void
1845 {
1850 /* We can just emit function and compiler-generated variables
1851 statically; having multiple copies is (for the most part) only
1852 a waste of space.
1854 There are two correctness issues, however: the address of a
1855 template instantiation with external linkage should be the
1856 same, independent of what translation unit asks for the
1857 address, and this will not hold when we emit multiple copies of
1858 the function. However, there's little else we can do.
1860 Also, by default, the typeinfo implementation assumes that
1861 there will be only one copy of the string used as the name for
1862 each type. Therefore, if weak symbols are unavailable, the
1863 run-time library should perform a more conservative check; it
1864 should perform a string comparison, rather than an address
1865 comparison. */
1867 else
1868 {
1869 /* Static data member template instantiations, however, cannot
1870 have multiple copies. */
1875 {
1878 }
1880 {
1881 /* We can't do anything useful; leave vars for explicit
1882 instantiation. */
1885 }
1886 }
1890 }
1892 /* For win32 we also want to put explicit instantiations in
1893 linkonce sections, so that they will be merged with implicit
1894 instantiations; otherwise we get duplicate symbol errors.
1895 For Darwin we do not want explicit instantiations to be
1896 linkonce. */
1898 void
1900 {
1901 /* We used to say that this was not necessary on targets that support weak
1902 symbols, because the implicit instantiations will defer to the explicit
1903 one. However, that's not actually the case in SVR4; a strong definition
1904 after a weak one is an error. Also, not making explicit
1905 instantiations one_only means that we can end up with two copies of
1906 some template instantiations. */
1910 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1911 we can get away with not emitting them if they aren't used. We need
1912 to for variables so that cp_finish_decl will update their linkage,
1913 because their DECL_INITIAL may not have been set properly yet. */
1918 {
1922 {
1925 /* Mark it needed so we don't forget to emit it. */
1928 }
1929 }
1930 }
1932 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1933 This predicate will give the right answer during parsing of the
1934 function, which other tests may not. */
1936 bool
1938 {
1940 {
1941 /* maybe_thunk_body clears TREE_PUBLIC on the maybe-in-charge 'tor
1942 variants, check one of the "clones" for the real linkage. */
1951 }
1952 /* Unfortunately, import_export_decl has not always been called
1953 before the function is processed, so we cannot simply check
1954 DECL_COMDAT. */
1963 /* A local static in an inline effectively has vague linkage. */
1966 else
1968 }
1970 /* Determine whether or not we want to specifically import or export CTYPE,
1971 using various heuristics. */
1973 static void
1975 {
1976 /* -1 for imported, 1 for exported. */
1979 /* It only makes sense to call this function at EOF. The reason is
1980 that this function looks at whether or not the first non-inline
1981 non-abstract virtual member function has been defined in this
1982 translation unit. But, we can't possibly know that until we've
1983 seen the entire translation unit. */
1989 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1990 we will have CLASSTYPE_INTERFACE_ONLY set but not
1991 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1992 heuristic because someone will supply a #pragma implementation
1993 elsewhere, and deducing it here would produce a conflict. */
2003 /* For a template class, without -fimplicit-templates, check the
2004 repository. If the virtual table is assigned to this
2005 translation unit, then export the class; otherwise, import
2006 it. */
2009 {
2010 /* The ABI specifies that the virtual table and associated
2011 information are emitted with the key method, if any. */
2013 /* If weak symbol support is not available, then we must be
2014 careful not to emit the vtable when the key function is
2015 inline. An inline function can be defined in multiple
2016 translation units. If we were to emit the vtable in each
2017 translation unit containing a definition, we would get
2018 multiple definition errors at link-time. */
2021 }
2023 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
2024 a definition anywhere else. */
2028 /* Allow back ends the chance to overrule the decision. */
2033 {
2036 }
2037 }
2039 /* Return true if VAR has already been provided to the back end; in that
2040 case VAR should not be modified further by the front end. */
2041 static bool
2043 {
2045 }
2047 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
2048 must be emitted in this translation unit. Mark it as such. */
2050 void
2052 {
2055 {
2056 /* Extern inline functions don't become needed when referenced.
2057 If we know a method will be emitted in other TU and no new
2058 functions can be marked reachable, just use the external
2059 definition. */
2063 /* #pragma interface and -frepo code can call mark_needed for
2064 maybe-in-charge 'tors; mark the clones as well. */
2065 tree clone;
2068 }
2070 {
2072 /* C++ frontend use mark_decl_references to force COMDAT variables
2073 to be output that might appear dead otherwise. */
2075 }
2076 }
2078 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
2079 returns true if a definition of this entity should be provided in
2080 this object file. Callers use this function to determine whether
2081 or not to let the back end know that a definition of DECL is
2082 available in this translation unit. */
2084 bool
2086 {
2088 /* This function should only be called at the end of the translation
2089 unit. We cannot be sure of whether or not something will be
2090 COMDAT until that point. */
2093 /* All entities with external linkage that are not COMDAT/EXTERN should be
2094 emitted; they may be referred to from other object files. */
2097 /* Functions marked "dllexport" must be emitted so that they are
2098 visible to other DLLs. */
2103 /* When not optimizing, do not bother to produce definitions for extern
2104 symbols. */
2113 /* If this entity was used, let the back end see it; it will decide
2114 whether or not to emit it into the object file. */
2118 /* Virtual functions might be needed for devirtualization. */
2124 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
2125 reference to DECL might cause it to be emitted later. */
2127 }
2129 /* If necessary, write out the vtables for the dynamic class CTYPE.
2130 Returns true if any vtables were emitted. */
2132 static bool
2134 {
2135 tree vtbl;
2136 tree primary_vtbl;
2140 /* If the vtables for this class have already been emitted there is
2141 nothing more to do. */
2145 /* Ignore dummy vtables made by get_vtable_decl. */
2149 /* On some targets, we cannot determine the key method until the end
2150 of the translation unit -- which is when this function is
2151 called. */
2155 /* See if any of the vtables are needed. */
2157 {
2161 }
2163 {
2164 /* If the references to this class' vtables are optimized away,
2165 still emit the appropriate debugging information. See
2166 dfs_debug_mark. */
2171 }
2173 /* The ABI requires that we emit all of the vtables if we emit any
2174 of them. */
2176 {
2177 /* Mark entities references from the virtual table as used. */
2181 {
2184 LOOKUP_NORMAL);
2186 /* It had better be all done at compile-time. */
2188 }
2190 /* Write it out. */
2194 /* Because we're only doing syntax-checking, we'll never end up
2195 actually marking the variable as written. */
2199 {
2204 }
2205 }
2207 /* Since we're writing out the vtable here, also write the debug
2208 info. */
2212 }
2214 /* A special return value from type_visibility meaning internal
2215 linkage. */
2219 /* walk_tree helper function for type_visibility. */
2221 static tree
2223 {
2226 {
2228 }
2231 {
2234 }
2239 }
2241 /* Returns the visibility of TYPE, which is the minimum visibility of its
2242 component types. */
2244 static int
2246 {
2250 }
2252 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2253 specified (or if VISIBILITY is static). If TMPL is true, this
2254 constraint is for a template argument, and takes precedence
2255 over explicitly-specified visibility on the template. */
2257 static void
2259 {
2261 {
2262 /* extern "C" declarations aren't affected by the anonymous
2263 namespace. */
2265 {
2271 {
2276 }
2280 }
2281 }
2284 {
2286 /* This visibility was not specified. */
2288 }
2289 }
2291 /* Constrain the visibility of DECL based on the visibility of its template
2292 arguments. */
2294 static void
2296 {
2297 /* If this is a template instantiation, check the innermost
2298 template args for visibility constraints. The outer template
2299 args are covered by the class check. */
2303 {
2309 else
2310 {
2318 {
2321 else
2323 }
2324 }
2327 }
2328 }
2330 /* Like c_determine_visibility, but with additional C++-specific
2331 behavior.
2333 Function-scope entities can rely on the function's visibility because
2334 it is set in start_preparsed_function.
2336 Class-scope entities cannot rely on the class's visibility until the end
2337 of the enclosing class definition.
2339 Note that because namespaces have multiple independent definitions,
2340 namespace visibility is handled elsewhere using the #pragma visibility
2341 machinery rather than by decorating the namespace declaration.
2343 The goal is for constraints from the type to give a diagnostic, and
2344 other constraints to be applied silently. */
2346 void
2348 {
2349 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2351 /* Only relevant for names with external linkage. */
2355 /* Cloned constructors and destructors get the same visibility as
2356 the underlying function. That should be set up in
2357 maybe_clone_body. */
2363 /* The decl may be a template instantiation, which could influence
2364 visibilty. */
2367 {
2369 {
2372 }
2375 }
2379 /* If DECL is a member of a class, visibility specifiers on the
2380 class can influence the visibility of the DECL. */
2384 else
2385 {
2386 /* Not a class member. */
2388 /* Virtual tables have DECL_CONTEXT set to their associated class,
2389 so they are automatically handled above. */
2394 {
2395 /* Local statics and classes get the visibility of their
2396 containing function by default, except that
2397 -fvisibility-inlines-hidden doesn't affect them. */
2400 {
2404 }
2405 else
2406 {
2410 {
2414 }
2415 else
2416 {
2420 }
2421 }
2423 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2424 but have no TEMPLATE_INFO. Their containing template
2425 function does, and the local class could be constrained
2426 by that. */
2430 {
2431 /* FN must be a regenerated lambda function, since they don't
2432 have template arguments. Find a containing non-lambda
2433 template instantiation. */
2438 }
2439 }
2442 {
2443 /* Under -fvisibility-ms-compat, types are visible by default,
2444 even though their contents aren't. */
2451 else
2453 }
2455 {
2456 /* tinfo visibility is based on the type it's for. */
2457 constrain_visibility
2460 /* Give the target a chance to override the visibility associated
2461 with DECL. */
2467 }
2469 /* Template instantiations and specializations get visibility based
2472 {
2475 else
2476 {
2477 /* Set default visibility to whatever the user supplied with
2478 #pragma GCC visibility or a namespace visibility attribute. */
2481 }
2482 }
2483 }
2486 {
2487 /* If the specialization doesn't specify visibility, use the
2488 visibility from the template. */
2496 {
2500 {
2504 else
2505 {
2509 }
2510 }
2513 /* Template argument visibility outweighs #pragma or namespace
2514 visibility, but not an explicit attribute. */
2516 {
2519 {
2520 /* A class template member with explicit visibility
2521 overrides the class visibility, so we need to apply
2522 all the levels of template args directly. */
2525 {
2528 }
2529 }
2531 /* Limit visibility based on its template arguments. */
2533 }
2534 }
2535 }
2541 /* Names in an anonymous namespace get internal linkage.
2542 This might change once we implement export. */
2545 {
2546 /* Propagate anonymity from type to decl. */
2551 }
2553 /* DR 757: A type without linkage shall not be used as the type of a
2554 variable or function with linkage, unless
2555 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2556 o the variable or function is not used (3.2 [basic.def.odr]) or is
2557 defined in the same translation unit.
2559 Since non-extern "C" decls need to be defined in the same
2560 translation unit, we can make the type internal. */
2563 /* If visibility changed and DECL already has DECL_RTL, ensure
2564 symbol flags are updated. */
2571 }
2573 /* By default, static data members and function members receive
2574 the visibility of their containing class. */
2576 static void
2578 {
2584 else
2585 {
2586 /* Default to the class visibility. */
2590 }
2592 /* Give the target a chance to override the visibility associated
2593 with DECL. */
2597 /* Construction virtual tables are not exported because
2598 they cannot be referred to from other object files;
2599 their name is not standardized by the ABI. */
2605 }
2607 /* Returns true iff DECL is an inline that should get hidden visibility
2608 because of -fvisibility-inlines-hidden. */
2610 static bool
2612 {
2614 /* Don't do this for inline templates; specializations might not be
2615 inline, and we don't want them to inherit the hidden
2616 visibility. We'll set it here for all inline instantiations. */
2617 && !processing_template_decl
2622 }
2624 /* Constrain the visibility of a class TYPE based on the visibility of its
2625 field types. Warn if any fields require lesser visibility. */
2627 void
2629 {
2630 tree binfo;
2631 tree t;
2640 /* Don't warn about visibility if the class has explicit visibility. */
2647 {
2652 {
2654 {
2657 {
2662 else
2666 }
2667 else
2671 }
2672 }
2679 }
2683 {
2687 {
2689 {
2692 {
2697 else
2701 }
2702 else
2706 }
2707 }
2713 }
2714 }
2716 /* Functions for adjusting the visibility of a tagged type and its nested
2717 types and declarations when it gets a name for linkage purposes from a
2718 typedef. */
2723 /* First reset the visibility of all the types. */
2725 static void
2727 {
2732 }
2733 static void
2735 {
2737 }
2739 /* Then reset the visibility of any static data members or member
2740 functions that use those types. */
2742 static void
2744 {
2753 }
2755 static void
2757 {
2759 {
2761 {
2766 }
2768 {
2774 }
2776 {
2780 }
2783 }
2784 }
2786 static void
2788 {
2790 }
2791 void
2793 {
2796 }
2798 /* Set up our initial idea of what the linkage of DECL should be. */
2800 void
2802 {
2804 /* We've already made a decision as to how this function will
2807 {
2810 {
2814 /* A non-template inline function with external linkage will
2815 always be COMDAT. As we must eventually determine the
2816 linkage of all functions, and as that causes writes to
2817 the data mapped in from the PCH file, it's advantageous
2818 to mark the functions at this point. */
2822 {
2823 /* This function must have external linkage, as
2824 otherwise DECL_INTERFACE_KNOWN would have been
2825 set. */
2829 }
2830 }
2833 }
2834 }
2836 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2837 for DECL has not already been determined, do so now by setting
2838 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2839 function is called entities with vague linkage whose definitions
2840 are available must have TREE_PUBLIC set.
2842 If this function decides to place DECL in COMDAT, it will set
2843 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2844 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2845 callers defer that decision until it is clear that DECL is actually
2846 required. */
2848 void
2850 {
2859 /* We cannot determine what linkage to give to an entity with vague
2860 linkage until the end of the file. For example, a virtual table
2861 for a class will be defined if and only if the key method is
2862 defined in this translation unit. As a further example, consider
2863 that when compiling a translation unit that uses PCH file with
2864 "-frepo" it would be incorrect to make decisions about what
2865 entities to emit when building the PCH; those decisions must be
2866 delayed until the repository information has been processed. */
2868 /* Object file linkage for explicit instantiations is handled in
2869 mark_decl_instantiated. For static variables in functions with
2870 vague linkage, maybe_commonize_var is used.
2872 Therefore, the only declarations that should be provided to this
2873 function are those with external linkage that are:
2875 * implicit instantiations of function templates
2877 * inline function
2879 * implicit instantiations of static data members of class
2880 templates
2882 * virtual tables
2884 * typeinfo objects
2886 Furthermore, all entities that reach this point must have a
2887 definition available in this translation unit.
2889 The following assertions check these conditions. */
2891 /* Any code that creates entities with TREE_PUBLIC cleared should
2892 also set DECL_INTERFACE_KNOWN. */
2898 else
2902 /* Check that a definition of DECL is available in this translation
2903 unit. */
2906 /* Assume that DECL will not have COMDAT linkage. */
2908 /* Assume that DECL will not be imported into this translation
2909 unit. */
2912 /* See if the repository tells us whether or not to emit DECL in
2913 this translation unit. */
2918 {
2919 /* The repository indicates that this entity should be defined
2920 here. Make sure the back end honors that request. */
2922 /* Output the definition as an ordinary strong definition. */
2926 }
2929 /* We have already decided what to do with this DECL; there is no
2930 need to check anything further. */
2931 ;
2933 {
2943 /* The ABI requires that all virtual tables be emitted with
2944 COMDAT linkage. However, on systems where COMDAT symbols
2945 don't show up in the table of contents for a static
2946 archive, or on systems without weak symbols (where we
2947 approximate COMDAT linkage by using internal linkage), the
2948 linker will report errors about undefined symbols because
2949 it will not see the virtual table definition. Therefore,
2950 in the case that we know that the virtual table will be
2951 emitted in only one translation unit, we make the virtual
2952 table an ordinary definition with external linkage. */
2955 {
2956 /* CLASS_TYPE is being exported from this translation unit,
2957 so DECL should be defined here. */
2959 /* If a class is declared in a header with the "extern
2960 template" extension, then it will not be instantiated,
2961 even in translation units that would normally require
2962 it. Often such classes are explicitly instantiated in
2963 one translation unit. Therefore, the explicit
2964 instantiation must be made visible to other translation
2965 units. */
2967 else
2968 {
2969 /* The generic C++ ABI says that class data is always
2970 COMDAT, even if there is a key function. Some
2971 variants (e.g., the ARM EABI) says that class data
2972 only has COMDAT linkage if the class data might be
2973 emitted in more than one translation unit. When the
2974 key method can be inline and is inline, we still have
2975 to arrange for comdat even though
2976 class_data_always_comdat is false. */
2980 {
2981 /* The ABI requires COMDAT linkage. Normally, we
2982 only emit COMDAT things when they are needed;
2983 make sure that we realize that this entity is
2984 indeed needed. */
2987 }
2988 }
2989 }
2993 else
2995 }
2997 {
3000 {
3006 /* If -fno-rtti was specified, then we cannot be sure
3007 that RTTI information will be emitted with the
3008 virtual table of the class, so we must emit it
3009 wherever it is used. */
3012 else
3013 {
3016 {
3022 {
3025 }
3026 }
3027 else
3029 }
3030 }
3031 else
3033 }
3035 {
3036 /* DECL is an implicit instantiation of a function or static
3037 data member. */
3040 || (flag_implicit_inline_templates
3044 else
3045 /* If we are not implicitly generating templates, then mark
3046 this entity as undefined in this translation unit. */
3048 }
3050 {
3052 {
3056 {
3060 && ! flag_implement_inlines
3066 /* Always make artificials weak. */
3069 else
3071 }
3072 }
3073 else
3075 }
3076 else
3080 {
3081 /* If we are importing DECL into this translation unit, mark is
3082 an undefined here. */
3085 }
3087 {
3088 /* If we decided to put DECL in COMDAT, mark it accordingly at
3089 this point. */
3091 }
3094 }
3096 /* Return an expression that performs the destruction of DECL, which
3097 must be a VAR_DECL whose type has a non-trivial destructor, or is
3098 an array whose (innermost) elements have a non-trivial destructor. */
3100 tree
3102 {
3106 }
3108 /* Returns the initialization guard variable for the variable DECL,
3109 which has static storage duration. */
3111 tree
3113 {
3114 tree sname;
3115 tree guard;
3120 {
3121 tree guard_type;
3123 /* We use a type that is big enough to contain a mutex as well
3124 as an integer counter. */
3129 /* The guard should have the same linkage as what it guards. */
3147 }
3149 }
3151 /* Return an atomic load of src with the appropriate memory model. */
3153 static tree
3155 {
3170 }
3172 /* Return those bits of the GUARD variable that should be set when the
3173 guarded entity is actually initialized. */
3175 static tree
3177 {
3179 {
3180 /* We only set the first byte of the guard, in order to leave room
3181 for a mutex in the high-order bits. */
3184 guard);
3187 guard);
3189 }
3192 }
3194 /* Return an expression which determines whether or not the GUARD
3195 variable has already been initialized. */
3197 tree
3199 {
3200 tree guard_value;
3204 else
3207 /* Mask off all but the low bit. */
3209 {
3215 tf_warning_or_error);
3216 }
3223 tf_warning_or_error);
3224 }
3226 /* Return an expression which sets the GUARD variable, indicating that
3227 the variable being guarded has been initialized. */
3229 tree
3231 {
3232 tree guard_init;
3234 /* Set the GUARD to one. */
3240 tf_warning_or_error);
3241 }
3243 /* Returns true iff we can tell that VAR does not have a dynamic
3244 initializer. */
3246 static bool
3248 {
3249 /* If it's defined in another TU, we can't tell. */
3252 /* If it has a non-trivial destructor, registering the destructor
3253 counts as dynamic initialization. */
3256 /* If it's in this TU, its initializer has been processed, unless
3257 it's a case of self-initialization, then DECL_INITIALIZED_P is
3258 false while the initializer is handled by finish_id_expression. */
3261 /* If it has no initializer or a constant one, it's not dynamic. */
3264 }
3266 /* Returns true iff VAR is a variable that needs uses to be
3267 wrapped for possible dynamic initialization. */
3269 static bool
3271 {
3277 }
3279 /* Get the FUNCTION_DECL for the shared TLS init function for this
3280 translation unit. */
3282 static tree
3284 {
3288 {
3291 void_list_node));
3297 }
3299 }
3301 /* Get a FUNCTION_DECL for the init function for the thread_local
3302 variable VAR. The init function will be an alias to the function
3303 that initializes all the non-local TLS variables in the translation
3304 unit. The init function is only used by the wrapper function. */
3306 static tree
3308 {
3309 /* Only C++11 TLS vars need this init fn. */
3313 /* If -fno-extern-tls-init, assume that we don't need to call
3314 a tls init function for a variable defined in another TU. */
3318 /* If the variable is internal, or if we can't generate aliases,
3319 call the local init function directly. */
3326 {
3329 void_list_node));
3338 {
3340 /* If the variable is defined somewhere else and might have static
3341 initialization, make the init function a weak reference. */
3348 else
3350 }
3360 }
3362 }
3364 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3365 variable VAR. The wrapper function calls the init function (if any) for
3366 VAR and then returns a reference to VAR. The wrapper function is used
3367 in place of VAR everywhere VAR is mentioned. */
3369 tree
3371 {
3372 /* Only C++11 TLS vars need this wrapper fn. */
3379 {
3380 /* A named rvalue reference is an lvalue, so the wrapper should
3381 always return an lvalue reference. */
3390 /* The wrapper is inline and emitted everywhere var is used. */
3393 {
3395 #ifdef HAVE_GAS_HIDDEN
3396 /* Make the wrapper bind locally; there's no reason to share
3397 the wrapper between multiple shared objects. */
3400 #endif
3401 }
3407 #if 0
3408 /* We want CSE to commonize calls to the wrapper, but marking it as
3409 pure is unsafe since it has side-effects. I guess we need a new
3410 ECF flag even weaker than ECF_PURE. FIXME! */
3412 #endif
3417 }
3419 }
3421 /* At EOF, generate the definition for the TLS wrapper function FN:
3423 T& var_wrapper() {
3424 if (init_fn) init_fn();
3425 return var;
3426 } */
3428 static void
3430 {
3435 /* Only call the init fn if there might be one. */
3437 {
3439 /* If init_fn is a weakref, make sure it exists before calling. */
3441 {
3446 tf_warning_or_error);
3448 }
3452 {
3455 }
3456 }
3457 else
3458 /* If there's no initialization, the wrapper is a constant function. */
3463 }
3465 /* Start the process of running a particular set of global constructors
3466 or destructors. Subroutine of do_[cd]tors. Also called from
3467 vtv_start_verification_constructor_init_function. */
3469 static tree
3471 {
3472 tree body;
3473 tree fndecl;
3476 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3479 {
3482 #ifdef JOINER
3484 #else
3486 #endif
3489 }
3490 else
3496 NULL_TREE));
3501 /* Mark as artificial because it's not explicitly in the user's
3502 source code. */
3505 /* Mark this declaration as used to avoid spurious warnings. */
3508 /* Mark this function as a global constructor or destructor. */
3511 else
3517 }
3519 /* Finish the process of running a particular set of global constructors
3520 or destructors. Subroutine of do_[cd]tors. */
3522 static void
3524 {
3525 tree fn;
3527 /* Finish up. */
3532 {
3535 }
3536 else
3537 {
3540 }
3543 }
3545 /* The names of the parameters to the function created to handle
3546 initializations and destructions for objects with static storage
3547 duration. */
3551 /* The name of the function we create to handle initializations and
3552 destructions for objects with static storage duration. */
3555 /* The declaration for the __INITIALIZE_P argument. */
3558 /* The declaration for the __PRIORITY argument. */
3561 /* The declaration for the static storage duration function. */
3564 /* All the static storage duration functions created in this
3565 translation unit. */
3568 /* A map from priority levels to information about that priority
3569 level. There may be many such levels, so efficient lookup is
3570 important. */
3573 /* Begins the generation of the function that will handle all
3574 initialization and destruction of objects with static storage
3575 duration. The function generated takes two parameters of type
3576 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3577 nonzero, it performs initializations. Otherwise, it performs
3578 destructions. It only performs those initializations or
3579 destructions with the indicated __PRIORITY. The generated function
3580 returns no value.
3582 It is assumed that this function will only be called once per
3583 translation unit. */
3585 static tree
3587 {
3588 tree type;
3589 tree body;
3592 /* Create the identifier for this function. It will be of the form
3593 SSDF_IDENTIFIER_<number>. */
3598 NULL_TREE);
3600 /* Create the FUNCTION_DECL itself. */
3603 type);
3607 /* Put this function in the list of functions to be called from the
3608 static constructors and destructors. */
3610 {
3613 /* Take this opportunity to initialize the map from priority
3614 numbers to information about that priority level. */
3617 /*delete_value_fn=*/
3621 /* We always need to generate functions for the
3622 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3623 priorities later, we'll be sure to find the
3624 DEFAULT_INIT_PRIORITY. */
3626 }
3630 /* Create the argument list. */
3631 initialize_p_decl = cp_build_parm_decl
3634 priority_decl = cp_build_parm_decl
3641 /* Put the function in the global scope. */
3644 /* Start the function itself. This is equivalent to declaring the
3645 function as:
3647 static void __ssdf (int __initialize_p, init __priority_p);
3649 It is static because we only need to call this function from the
3650 various constructor and destructor functions for this module. */
3653 SF_PRE_PARSED);
3655 /* Set up the scope of the outermost block in the function. */
3659 }
3661 /* Finish the generation of the function which performs initialization
3662 and destruction of objects with static storage duration. After
3663 this point, no more such objects can be created. */
3665 static void
3667 {
3668 /* Close out the function. */
3671 }
3673 /* Return the information about the indicated PRIORITY level. If no
3674 code to handle this level has yet been generated, generate the
3675 appropriate prologue. */
3677 static priority_info
3679 {
3680 priority_info pi;
3681 splay_tree_node n;
3686 {
3687 /* Create a new priority information structure, and insert it
3688 into the map. */
3695 }
3696 else
3700 }
3702 /* The effective initialization priority of a DECL. */
3704 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3705 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3706 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3708 /* Whether a DECL needs a guard to protect it against multiple
3709 initialization. */
3711 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3712 || DECL_ONE_ONLY (decl) \
3713 || DECL_WEAK (decl)))
3715 /* Called from one_static_initialization_or_destruction(),
3716 via walk_tree.
3717 Walks the initializer list of a global variable and looks for
3718 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3719 and that have their DECL_CONTEXT() == NULL.
3720 For each such temporary variable, set their DECL_CONTEXT() to
3721 the current function. This is necessary because otherwise
3722 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3723 when trying to refer to a temporary variable that does not have
3724 it's DECL_CONTECT() properly set. */
3725 static tree
3729 {
3733 {
3734 tree var;
3742 }
3745 }
3747 /* Set up to handle the initialization or destruction of DECL. If
3748 INITP is nonzero, we are initializing the variable. Otherwise, we
3749 are destroying it. */
3751 static void
3753 {
3755 tree guard;
3757 /* If we are supposed to destruct and there's a trivial destructor,
3758 nothing has to be done. */
3763 /* Trick the compiler into thinking we are at the file and line
3764 where DECL was declared so that error-messages make sense, and so
3765 that the debugger will show somewhat sensible file and line
3766 information. */
3769 /* Make sure temporary variables in the initialiser all have
3770 their DECL_CONTEXT() set to a value different from NULL_TREE.
3771 This can happen when global variables initializers are built.
3772 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3773 the temporary variables that might have been generated in the
3774 accompanying initializers is NULL_TREE, meaning the variables have been
3775 declared in the global namespace.
3776 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3777 of the temporaries are set to the current function decl. */
3779 fix_temporary_vars_context_r,
3780 NULL);
3782 /* Because of:
3784 [class.access.spec]
3786 Access control for implicit calls to the constructors,
3787 the conversion functions, or the destructor called to
3788 create and destroy a static data member is performed as
3789 if these calls appeared in the scope of the member's
3790 class.
3792 we pretend we are in a static member function of the class of
3793 which the DECL is a member. */
3795 {
3798 }
3800 /* Assume we don't need a guard. */
3802 /* We need a guard if this is an object with external linkage that
3803 might be initialized in more than one place. (For example, a
3804 static data member of a template, when the data member requires
3805 construction.) */
3807 {
3808 tree guard_cond;
3812 /* When using __cxa_atexit, we just check the GUARD as we would
3813 for a local static. */
3815 {
3816 /* When using __cxa_atexit, we never try to destroy
3817 anything from a static destructor. */
3820 }
3821 /* If we don't have __cxa_atexit, then we will be running
3822 destructors from .fini sections, or their equivalents. So,
3823 we need to know how many times we've tried to initialize this
3824 object. We do initializations only if the GUARD is zero,
3825 i.e., if we are the first to initialize the variable. We do
3826 destructions only if the GUARD is one, i.e., if we are the
3827 last to destroy the variable. */
3829 guard_cond
3831 EQ_EXPR,
3833 guard,
3835 tf_warning_or_error),
3836 integer_one_node,
3837 tf_warning_or_error);
3838 else
3839 guard_cond
3841 EQ_EXPR,
3843 guard,
3845 tf_warning_or_error),
3846 integer_zero_node,
3847 tf_warning_or_error);
3851 }
3854 /* If we're using __cxa_atexit, we have not already set the GUARD,
3855 so we must do so now. */
3859 /* Perform the initialization or destruction. */
3861 {
3863 {
3866 {
3870 }
3871 }
3873 /* If we're using __cxa_atexit, register a function that calls the
3874 destructor for the object. */
3877 }
3878 else
3881 /* Finish the guard if-stmt, if necessary. */
3883 {
3886 }
3888 /* Now that we're done with DECL we don't need to pretend to be a
3889 member of its class any longer. */
3892 }
3894 /* Generate code to do the initialization or destruction of the decls in VARS,
3895 a TREE_LIST of VAR_DECL with static storage duration.
3896 Whether initialization or destruction is performed is specified by INITP. */
3898 static void
3900 {
3903 /* Build the outer if-stmt to check for initialization or destruction. */
3907 EQ_EXPR,
3908 initialize_p_decl,
3909 cond,
3910 tf_warning_or_error);
3913 /* To make sure dynamic construction doesn't access globals from other
3914 compilation units where they might not be yet constructed, for
3915 -fsanitize=address insert __asan_before_dynamic_init call that
3916 prevents access to either all global variables that need construction
3917 in other compilation units, or at least those that haven't been
3918 initialized yet. Variables that need dynamic construction in
3919 the current compilation unit are kept accessible. */
3926 tree priority_if_stmt;
3928 priority_info pi;
3930 /* If we don't need a destructor, there's nothing to do. Avoid
3931 creating a possibly empty if-stmt. */
3933 {
3936 }
3938 /* Remember that we had an initialization or finalization at this
3939 priority. */
3944 else
3947 /* Conditionalize this initialization on being in the right priority
3948 and being initializing/finalizing appropriately. */
3951 EQ_EXPR,
3952 priority_decl,
3954 tf_warning_or_error);
3957 /* Process initializers with same priority. */
3961 /* Do one initialization or destruction. */
3965 /* Finish up the priority if-stmt body. */
3971 /* Revert what __asan_before_dynamic_init did by calling
3972 __asan_after_dynamic_init. */
3976 /* Finish up the init/destruct if-stmt body. */
3979 }
3981 /* VARS is a list of variables with static storage duration which may
3982 need initialization and/or finalization. Remove those variables
3983 that don't really need to be initialized or finalized, and return
3984 the resulting list. The order in which the variables appear in
3985 VARS is in reverse order of the order in which they should actually
3986 be initialized. The list we return is in the unreversed order;
3987 i.e., the first variable should be initialized first. */
3989 static tree
3991 {
3996 {
4001 /* Deal gracefully with error. */
4003 {
4006 }
4008 /* The only things that can be initialized are variables. */
4011 /* If this object is not defined, we don't need to do anything
4012 here. */
4014 {
4017 }
4019 /* Also, if the initializer already contains errors, we can bail
4020 out now. */
4023 {
4026 }
4028 /* This variable is going to need initialization and/or
4029 finalization, so we add it to the list. */
4033 }
4036 }
4038 /* Make sure we have told the back end about all the variables in
4039 VARS. */
4041 static void
4043 {
4044 tree v;
4047 {
4050 {
4053 }
4054 }
4055 }
4057 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
4058 (otherwise) that will initialize all global objects with static
4059 storage duration having the indicated PRIORITY. */
4061 static void
4064 {
4066 tree fndecl;
4067 tree body;
4071 /* ??? */
4072 /* Was: locus->line++; */
4074 /* We use `I' to indicate initialization and `D' to indicate
4075 destruction. */
4078 /* We emit the function lazily, to avoid generating empty
4079 global constructors and destructors. */
4082 /* For Objective-C++, we may need to initialize metadata found in this module.
4083 This must be done _before_ any other static initializations. */
4086 {
4089 }
4091 /* Call the static storage duration function with appropriate
4092 arguments. */
4094 {
4095 /* Calls to pure or const functions will expand to nothing. */
4097 {
4098 tree call;
4105 constructor_p),
4107 priority),
4108 NULL_TREE);
4110 }
4111 }
4113 /* Close out the function. */
4116 }
4118 /* Generate constructor and destructor functions for the priority
4119 indicated by N. */
4121 static int
4123 {
4128 /* Generate the functions themselves, but only if they are really
4129 needed. */
4135 /* Keep iterating. */
4137 }
4139 /* Return C++ property of T, based on given operation OP. */
4141 static int
4143 {
4145 {
4147 {
4155 }
4172 }
4173 }
4175 /* Collect source file references recursively, starting from NAMESPC. */
4177 static void
4179 {
4180 /* Iterate over names in this name space. */
4183 ;
4186 else
4188 }
4190 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4191 starting from NAMESPC. */
4193 static void
4195 {
4198 /* Collect decls from this namespace. This will skip
4199 NAMESPACE_DECLs (both aliases and regular, it cannot tell). */
4202 /* Now scan for namespace children, and dump them. */
4206 }
4208 /* Returns true iff there is a definition available for variable or
4209 function DECL. */
4211 bool
4213 {
4216 /* A pending instantiation of a friend temploid is defined. */
4220 else
4221 {
4224 }
4225 }
4227 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4229 [expr.const]
4231 An integral constant-expression can only involve ... const
4232 variables of integral or enumeration types initialized with
4233 constant expressions ...
4235 C++0x also allows constexpr variables and temporaries initialized
4236 with constant expressions. We handle the former here, but the latter
4237 are just folded away in cxx_eval_constant_expression.
4239 The standard does not require that the expression be non-volatile.
4240 G++ implements the proposed correction in DR 457. */
4242 bool
4244 {
4248 /* We don't know if a template static data member is initialized with
4249 a constant expression until we instantiate its initializer. Even
4250 in the case of a constexpr variable, we can't treat it as a
4251 constant until its initializer is complete in case it's used in
4252 its own initializer. */
4255 }
4257 /* Returns true if DECL could be a symbolic constant variable, depending on
4258 its initializer. */
4260 bool
4262 {
4269 /* A proxy isn't constant. */
4276 else
4281 /* We know the initializer, and it isn't constant. */
4283 else
4285 }
4287 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4288 called from grokfndecl and grokvardecl; in all modes it is called from
4289 cp_write_global_declarations. */
4291 void
4293 {
4295 /* In C++11 it's ok if the decl is defined. */
4299 /* The type that got us on no_linkage_decls must have gotten a name for
4302 /* The type might end up having a typedef name for linkage purposes. */
4305 {
4313 /* DRs 132, 319 and 389 seem to indicate types with
4314 no linkage can only be used to declare extern "C"
4315 entities. Since it's not always an error in the
4316 ISO C++ 90 Standard, we only issue a warning. */
4318 "with no linkage used to declare variable %q#D with "
4320 else
4323 decl);
4328 }
4330 {
4333 "%q#D, declared using local type "
4335 }
4339 else
4342 }
4344 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4346 static void
4348 {
4350 }
4352 /* Clear DECL_EXTERNAL for NODE. */
4354 static bool
4356 {
4359 }
4361 /* Build up the function to run dynamic initializers for thread_local
4362 variables in this translation unit and alias the init functions for the
4363 individual variables to it. */
4365 static void
4367 {
4377 boolean_type_node);
4392 tf_warning_or_error);
4395 boolean_true_node,
4396 tf_warning_or_error));
4398 {
4403 /* Output init aliases even with -fno-extern-tls-init. */
4405 {
4409 cgraph_node *alias
4413 }
4414 }
4420 }
4422 /* We're at the end of compilation, so generate any mangling aliases that
4423 we've been saving up, if DECL is going to be output and ID2 isn't
4424 already taken by another declaration. */
4426 static void
4428 {
4432 {
4435 /* Don't create an alias to an unreferenced function. */
4437 }
4439 tree *slot
4441 INSERT);
4443 /* If there's a declaration already using this mangled name,
4444 don't create a compatibility alias that conflicts. */
4459 else
4461 }
4463 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4464 the end of translation, for compatibility across bugs in the mangling
4465 implementation. */
4467 void
4469 {
4471 {
4474 else
4475 {
4478 }
4479 }
4480 }
4482 /* Emit all mangling aliases that were deferred up to this point. */
4484 void
4486 {
4488 {
4492 }
4494 }
4496 /* Record a mangling of DECL, whose DECL_ASSEMBLER_NAME has just been
4497 set. NEED_WARNING is true if we must warn about collisions. We do
4498 this to spot changes in mangling that may require compatibility
4499 aliases. */
4501 void
4503 {
4509 tree *slot
4511 INSERT);
4513 /* If this is already an alias, remove the alias, because the real
4514 decl takes precedence. */
4518 {
4521 }
4526 {
4533 "a later -fabi-version= (or =0)"
4536 }
4537 }
4539 /* The mangled name of DECL is being forcibly changed to NAME. Remove
4540 any existing knowledge of DECL's mangled name meaning DECL. */
4542 void
4544 {
4551 NO_INSERT))
4553 {
4556 /* If this is an alias, remove it from the symbol table. */
4561 }
4564 }
4566 /* The entire file is now complete. If requested, dump everything
4567 to a file. */
4569 static void
4571 {
4572 dump_flags_t flags;
4574 {
4577 }
4578 }
4582 /* Check the deallocation functions for CODE to see if we want to warn that
4583 only one was defined. */
4585 static void
4587 {
4593 {
4595 /* We're only interested in usual deallocation functions. */
4600 else
4602 }
4609 }
4611 /* Check the global deallocation functions to see if we want to warn about
4612 defining unsized without sized (or vice versa). */
4614 static void
4616 {
4621 }
4623 /* Earlier we left PTRMEM_CST in variable initializers alone so that we could
4624 look them up when evaluating non-type template parameters. Now we need to
4625 lower them to something the back end can understand. */
4627 static void
4629 {
4632 {
4636 }
4637 }
4639 /* This routine is called at the end of compilation.
4640 Its job is to create all the code needed to initialize and
4641 destroy the global aggregates. We do the destruction
4642 first, since that way we only need to reverse the decls once. */
4644 void
4646 {
4647 tree vars;
4652 tree decl;
4657 /* Bad parse errors. Just forget about it. */
4662 /* This is the point to write out a PCH if we're doing that.
4663 In that case we do not want to do anything else. */
4665 {
4666 /* Mangle all symbols at PCH creation time. */
4674 /* Ensure even the callers don't try to finalize the CU. */
4677 }
4684 /* Handle -fdump-ada-spec[-slim] */
4686 {
4689 else
4693 }
4695 /* FIXME - huh? was input_line -= 1;*/
4697 /* We now have to write out all the stuff we put off writing out.
4698 These include:
4700 o Template specializations that we have not yet instantiated,
4701 but which are needed.
4702 o Initialization and destruction for non-local objects with
4703 static storage duration. (Local objects with static storage
4704 duration are initialized when their scope is first entered,
4705 and are cleaned up via atexit.)
4706 o Virtual function tables.
4708 All of these may cause others to be needed. For example,
4709 instantiating one function may cause another to be needed, and
4710 generating the initializer for an object may cause templates to be
4711 instantiated, etc., etc. */
4715 do
4716 {
4717 tree t;
4718 tree decl;
4722 /* If there are templates that we've put off instantiating, do
4723 them now. */
4727 /* Write out virtual tables as required. Writing out the
4728 virtual table for a template class may cause the
4729 instantiation of members of that class. If we write out
4730 vtables then we remove the class from our list so we don't
4731 have to look at it again. */
4735 {
4738 }
4739 /* The input_location may have been changed during marking of
4740 vtable entries. */
4743 /* Write out needed type info variables. We have to be careful
4744 looping through unemitted decls, because emit_tinfo_decl may
4745 cause other variables to be needed. New elements will be
4746 appended, and we remove from the vector those that actually
4747 get emitted. */
4751 {
4754 }
4756 /* The list of objects with static storage duration is built up
4757 in reverse order. We clear STATIC_AGGREGATES so that any new
4758 aggregates added during the initialization of these will be
4759 initialized in the correct order when we next come around the
4760 loop. */
4764 {
4765 /* We need to start a new initialization function each time
4766 through the loop. That's because we need to know which
4767 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4768 isn't computed until a function is finished, and written
4769 out. That's a deficiency in the back end. When this is
4770 fixed, these initialization functions could all become
4771 inline, with resulting performance improvements. */
4772 tree ssdf_body;
4774 /* Set the line and file, so that it is obviously not from
4775 the source file. */
4779 /* Make sure the back end knows about all the variables. */
4782 /* First generate code to do all the initializations. */
4786 /* Then, generate code to do all the destructions. Do these
4787 in reverse order so that the most recently constructed
4788 variable is the first destroyed. If we're using
4789 __cxa_atexit, then we don't need to do this; functions
4790 were registered at initialization time to destroy the
4791 local statics. */
4793 {
4796 }
4797 else
4800 /* Finish up the static storage duration function for this
4801 round. */
4805 /* All those initializations and finalizations might cause
4806 us to need more inline functions, more template
4807 instantiations, etc. */
4809 ssdf_count++;
4810 /* ??? was: locus_at_end_of_parsing.line++; */
4811 }
4813 /* Now do the same for thread_local variables. */
4816 /* Go through the set of inline functions whose bodies have not
4817 been emitted yet. If out-of-line copies of these functions
4818 are required, emit them. */
4820 {
4821 /* Does it need synthesizing? */
4824 {
4825 /* Even though we're already at the top-level, we push
4826 there again. That way, when we pop back a few lines
4827 hence, all of our state is restored. Otherwise,
4828 finish_function doesn't clean things up, and we end
4829 up with CURRENT_FUNCTION_DECL set. */
4831 /* The decl's location will mark where it was first
4832 needed. Save that so synthesize method can indicate
4833 where it was needed from, in case of error */
4838 }
4848 /* We lie to the back end, pretending that some functions
4849 are not defined when they really are. This keeps these
4850 functions from being put out unnecessarily. But, we must
4851 stop lying when the functions are referenced, or if they
4852 are not comdat since they need to be put out now. If
4853 DECL_INTERFACE_KNOWN, then we have already set
4854 DECL_EXTERNAL appropriately, so there's no need to check
4855 again, and we do not want to clear DECL_EXTERNAL if a
4856 previous call to import_export_decl set it.
4858 This is done in a separate for cycle, because if some
4859 deferred function is contained in another deferred
4860 function later in deferred_fns varray,
4861 rest_of_compilation would skip this function and we
4862 really cannot expand the same function twice. */
4867 {
4873 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4874 group, we need to mark all symbols in the same comdat group
4875 that way. */
4883 }
4885 /* If we're going to need to write this function out, and
4886 there's already a body for it, create RTL for it now.
4887 (There might be no body if this is a method we haven't
4888 gotten around to synthesizing yet.) */
4893 {
4894 /* We will output the function; no longer consider it in this
4895 loop. */
4897 /* Generate RTL for this function now that we know we
4898 need it. */
4900 /* If we're compiling -fsyntax-only pretend that this
4901 function has been written out so that we don't try to
4902 expand it again. */
4906 }
4907 }
4912 /* Static data members are just like namespace-scope globals. */
4914 {
4916 /* Don't write it out if we haven't seen a definition. */
4920 /* If this static data member is needed, provide it to the
4921 back end. */
4924 }
4930 retries++;
4931 }
4938 /* All used inline functions must have a definition at this point. */
4940 {
4943 /* If the definition actually was available here, then the
4944 fact that the function was not defined merely represents
4945 that for some reason (use of a template repository,
4946 #pragma interface, etc.) we decided not to emit the
4947 definition here. */
4949 /* Don't complain if the template was defined. */
4953 {
4956 /* Avoid a duplicate warning from check_global_declaration. */
4958 }
4959 }
4961 /* So must decls that use a type with no linkage. */
4967 /* Then, do the Objective-C stuff. This is where all the
4968 Objective-C module stuff gets generated (symtab,
4969 class/protocol/selector lists etc). This must be done after C++
4970 templates, destructors etc. so that selectors used in C++
4971 templates are properly allocated. */
4975 /* We give C linkage to static constructors and destructors. */
4978 /* Generate initialization and destruction functions for all
4979 priorities for which they are required. */
4982 generate_ctor_and_dtor_functions_for_priority,
4985 /* If this is obj-c++ and we need a static init, call
4986 generate_ctor_or_dtor_function. */
4988 DEFAULT_INIT_PRIORITY,
4991 /* We're done with the splay-tree now. */
4995 /* Generate any missing aliases. */
4998 /* We're done with static constructors, so we can go back to "C++"
4999 linkage now. */
5003 {
5007 }
5014 /* The entire file is now complete. If requested, dump everything
5015 to a file. */
5019 {
5022 }
5027 /* Indicate that we're done with front end processing. */
5029 }
5031 /* Perform any post compilation-proper cleanups for the C++ front-end.
5032 This should really go away. No front-end should need to do
5033 anything past the compilation process. */
5035 void
5037 {
5041 {
5042 /* Generate the special constructor initialization function that
5043 calls __VLTRegisterPairs, and give it a very high
5044 initialization priority. This must be done after
5045 finalize_compilation_unit so that we have accurate
5046 information about which vtable will actually be emitted. */
5048 }
5056 }
5058 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
5059 function to call in parse-tree form; it has not yet been
5060 semantically analyzed. ARGS are the arguments to the function.
5061 They have already been semantically analyzed. This may change
5062 ARGS. */
5064 tree
5066 tsubst_flags_t complain)
5067 {
5068 tree orig_fn;
5070 tree expr;
5071 tree object;
5077 {
5086 /* Transform the arguments and add the implicit "this"
5087 parameter. That must be done before the FN is transformed
5088 because we depend on the form of FN. */
5092 {
5096 }
5097 /* Now that the arguments are done, transform FN. */
5099 }
5101 /* A qualified name corresponding to a bound pointer-to-member is
5102 represented as an OFFSET_REF:
5104 struct B { void g(); };
5105 void (B::*p)();
5106 void B::g() { (this->*p)(); } */
5108 {
5112 complain);
5114 }
5118 else
5127 }
5130 void
5132 {
5137 {
5141 {
5144 }
5145 }
5146 }
5148 /* Return true if function DECL can be inlined. This is used to force
5149 instantiation of methods that might be interesting for inlining. */
5150 bool
5152 {
5158 /* When optimizing, we might inline everything when flatten
5159 attribute or heuristics inlining for size or autoinlining
5160 is used. */
5162 }
5164 /* Normally, we can wait until instantiation-time to synthesize DECL.
5165 However, if DECL is a static data member initialized with a constant
5166 or a constexpr function, we need it right now because a reference to
5167 such a data member or a call to such function is not value-dependent.
5168 For a function that uses auto in the return type, we need to instantiate
5169 it to find out its type. For OpenMP user defined reductions, we need
5170 them instantiated for reduction clauses which inline them by hand
5171 directly. */
5173 static void
5175 {
5184 {
5185 /* Instantiating a function will result in garbage collection. We
5186 must treat this situation as if we were within the body of a
5187 function so as to avoid collecting live data only referenced from
5188 the stack (such as overload resolution candidates). */
5193 }
5194 }
5196 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
5197 If DECL is a specialization or implicitly declared class member,
5198 generate the actual definition. Return false if something goes
5199 wrong, true otherwise. */
5201 bool
5203 {
5204 /* If DECL is a BASELINK for a single function, then treat it just
5205 like the DECL for the function. Otherwise, if the BASELINK is
5206 for an overloaded function, we don't know which function was
5207 actually used until after overload resolution. */
5209 {
5214 }
5216 /* Set TREE_USED for the benefit of -Wunused. */
5218 /* And for structured bindings also the underlying decl. */
5228 /* Mark enumeration types as used. */
5238 {
5242 /* We mark a lambda conversion op as deleted if we can't
5243 generate it properly; see maybe_add_lambda_conv_op. */
5246 {
5250 }
5252 }
5258 /* We can only check DECL_ODR_USED on variables or functions with
5259 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5260 might need special handling for. */
5264 {
5269 }
5271 /* We only want to do this processing once. We don't need to keep trying
5272 to instantiate inline templates, because unit-at-a-time will make sure
5273 we get them compiled before functions that want to inline them. */
5277 /* Normally, we can wait until instantiation-time to synthesize DECL.
5278 However, if DECL is a static data member initialized with a constant
5279 or a constexpr function, we need it right now because a reference to
5280 such a data member or a call to such function is not value-dependent.
5281 For a function that uses auto in the return type, we need to instantiate
5282 it to find out its type. For OpenMP user defined reductions, we need
5283 them instantiated for reduction clauses which inline them by hand
5284 directly. */
5290 /* Check this too in case we're within instantiate_non_dependent_expr. */
5299 {
5303 }
5305 /* If we don't need a value, then we don't need to synthesize DECL. */
5313 /* DR 757: A type without linkage shall not be used as the type of a
5314 variable or function with linkage, unless
5315 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5316 o the variable or function is not used (3.2 [basic.def.odr]) or is
5317 defined in the same translation unit. */
5324 {
5326 /* There's no way to define a local extern, and adding it to
5327 the vector interferes with GC, so give an error now. */
5329 else
5331 }
5335 /* Remember it, so we can check it was defined. */
5338 /* Is it a synthesized method that needs to be synthesized? */
5342 /* A function defaulted outside the class is synthesized either by
5343 cp_finish_decl or instantiate_decl. */
5346 {
5347 /* Defer virtual destructors so that thunks get the right
5348 linkage. */
5350 {
5353 }
5355 /* Remember the current location for a function we will end up
5356 synthesizing. Then we can inform the user where it was
5357 required in the case of error. */
5360 /* Synthesizing an implicitly defined member function will result in
5361 garbage collection. We must treat this situation as if we were
5362 within the body of a function so as to avoid collecting live data
5363 on the stack (such as overload resolution candidates).
5365 We could just let cp_write_global_declarations handle synthesizing
5366 this function by adding it to deferred_fns, but doing
5367 it at the use site produces better error messages. */
5371 /* If this is a synthesized method we don't need to
5372 do the instantiation test below. */
5373 }
5379 /* If this is a function or variable that is an instance of some
5380 template, we now know that we will need to actually do the
5381 instantiation. We check that DECL is not an explicit
5382 instantiation because that is not checked in instantiate_decl.
5384 We put off instantiating functions in order to improve compile
5385 times. Maintaining a stack of active functions is expensive,
5386 and the inliner knows to instantiate any functions it might
5387 need. Therefore, we always try to defer instantiation. */
5388 {
5393 }
5396 }
5398 bool
5400 {
5402 }
5404 tree
5406 {
5408 }
5410 tree
5412 {
5413 tree fn;
5421 }