| blob | f045253a1ab8ed6dc3232e009e263332f4df850b |
1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988-2015 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. */
64 /* This structure contains information about the initializations
65 and/or destructions required for a particular priority level. */
67 /* Nonzero if there have been any initializations at this priority
68 throughout the translation unit. */
70 /* Nonzero if there have been any destructions at this priority
71 throughout the translation unit. */
96 /* A list of static class variables. This is needed, because a
97 static class variable can be declared inside the class without
98 an initializer, and then initialized, statically, outside the class. */
101 /* A list of functions which were declared inline, but which we
102 may need to emit outline anyway. */
105 /* A list of decls that use types with no linkage, which we need to make
106 sure are defined. */
109 /* A vector of alternating decls and identifiers, where the latter
110 is to be an alias for the former if the former is defined. */
113 /* Nonzero if we're done parsing and into end-of-file activities. */
116 \f
118 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
119 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
120 that apply to the function). */
122 tree
124 cp_ref_qualifier rqual)
125 {
126 tree raises;
127 tree attrs;
156 }
158 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
159 return type changed to NEW_RET. */
161 tree
163 {
164 tree newtype;
177 {
182 }
183 else
184 newtype = build_method_type_directly
196 }
198 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
199 appropriately. */
201 tree
203 {
206 /* DECL_ARG_TYPE is only used by the back end and the back end never
207 sees templates. */
212 }
214 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
215 indicated NAME. */
217 tree
219 {
222 /* All our artificial parms are implicitly `const'; they cannot be
223 assigned to. */
226 }
228 /* Constructors for types with virtual baseclasses need an "in-charge" flag
229 saying whether this constructor is responsible for initialization of
230 virtual baseclasses or not. All destructors also need this "in-charge"
231 flag, which additionally determines whether or not the destructor should
232 free the memory for the object.
234 This function adds the "in-charge" flag to member function FN if
235 appropriate. It is called from grokclassfn and tsubst.
236 FN must be either a constructor or destructor.
238 The in-charge flag follows the 'this' parameter, and is followed by the
239 VTT parm (if any), then the user-written parms. */
241 void
243 {
246 /* If we've already add the in-charge parameter don't do it again. */
250 /* When processing templates we can't know, in general, whether or
251 not we're going to have virtual baseclasses. */
255 /* We don't need an in-charge parameter for constructors that don't
256 have virtual bases. */
267 /* If this is a subobject constructor or destructor, our caller will
268 pass us a pointer to our VTT. */
270 {
273 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
277 /* ...and then to TYPE_ARG_TYPES. */
281 }
283 /* Then add the in-charge parm (before the VTT parm). */
289 /* Insert our new parameter(s) into the list. */
292 /* And rebuild the function type. */
294 arg_types);
299 fntype = (cp_build_type_attribute_variant
303 /* Now we've got the in-charge parameter. */
305 }
307 /* Classes overload their constituent function names automatically.
308 When a function name is declared in a record structure,
309 its name is changed to it overloaded name. Since names for
310 constructors and destructors can conflict, we place a leading
311 '$' for destructors.
313 CNAME is the name of the class we are grokking for.
315 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
317 FLAGS contains bits saying what's special about today's
318 arguments. DTOR_FLAG == DESTRUCTOR.
320 If FUNCTION is a destructor, then we must add the `auto-delete' field
321 as a second parameter. There is some hair associated with the fact
322 that we must "declare" this variable in the manner consistent with the
323 way the rest of the arguments were declared.
325 QUALS are the qualifiers for the this pointer. */
327 void
329 {
332 /* Even within an `extern "C"' block, members get C++ linkage. See
333 [dcl.link] for details. */
337 {
341 }
350 }
352 /* Create an ARRAY_REF, checking for the user doing things backwards
353 along the way. DECLTYPE_P is for N3276, as in the parser. */
355 tree
358 {
359 tree type;
360 tree expr;
368 {
375 }
381 /* If they have an `operator[]', use that. */
383 {
389 }
390 else
391 {
394 /* Otherwise, create an ARRAY_REF for a pointer or array type.
395 It is a little-known fact that, if `a' is an array and `i' is
396 an int, you can write `i[a]', which means the same thing as
397 `a[i]'. */
400 else
405 else
420 else
421 {
425 }
431 }
436 }
438 /* Given the cast expression EXP, checking out its validity. Either return
439 an error_mark_node if there was an unavoidable error, return a cast to
440 void for trying to delete a pointer w/ the value 0, or return the
441 call to delete. If DOING_VEC is true, we handle things differently
442 for doing an array delete.
443 Implements ARM $5.3.4. This is called from the parser. */
445 tree
447 tsubst_flags_t complain)
448 {
455 {
461 }
463 /* An array can't have been allocated by new, so complain. */
470 {
474 }
478 /* As of Valley Forge, you can delete a pointer to const. */
480 /* You can't delete functions. */
482 {
486 }
488 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
490 {
493 }
495 /* Deleting a pointer with the value zero is valid and has no effect. */
501 sfk_deleting_destructor,
503 else
506 complain);
507 }
509 /* Report an error if the indicated template declaration is not the
510 sort of thing that should be a member template. */
512 void
514 {
515 tree decl;
524 {
525 /* The parser rejects template declarations in local classes
526 (with the exception of generic lambdas). */
528 /* The parser rejects any use of virtual in a function template. */
532 /* The debug-information generating code doesn't know what to do
533 with member templates. */
535 }
538 else
540 }
542 /* Return true iff TYPE is a valid Java parameter or return type. */
544 static bool
546 {
553 {
556 {
565 {
571 }
573 }
574 }
576 }
578 /* For a METHOD in a Java class CTYPE, return true if
579 the parameter and return types are valid Java types.
580 Otherwise, print appropriate error messages, and return false. */
582 bool
584 {
590 {
594 }
603 {
606 {
611 }
612 }
614 }
616 /* Sanity check: report error if this function FUNCTION is not
617 really a member of the class (CTYPE) it is supposed to belong to.
618 TEMPLATE_PARMS is used to specify the template parameters of a member
619 template passed as FUNCTION_DECL. If the member template is passed as a
620 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
621 from the declaration. If the function is not a function template, it
622 must be NULL.
623 It returns the original declaration for the function, NULL_TREE if
624 no declaration was found, error_mark_node if an error was emitted. */
626 tree
628 {
631 tree pushed_scope;
637 /* Since this is a specialization of a member template,
638 we're not going to find the declaration in the class.
639 For example, in:
641 struct S { template <typename T> void f(T); };
642 template <> void S::f(int);
644 we're not going to find `S::f(int)', but there's no
645 reason we should, either. We let our callers know we didn't
646 find the method, but we don't complain. */
649 /* Basic sanity check: for a template function, the template parameters
650 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
652 {
656 {
660 }
662 }
664 /* OK, is this a definition of a member template? */
667 /* [temp.mem]
669 A destructor shall not be a member template. */
671 {
674 }
676 /* We must enter the scope here, because conversion operators are
677 named by target type, and type equivalence relies on typenames
678 resolving within the scope of CTYPE. */
682 {
690 {
697 /* We cannot simply call decls_match because this doesn't
698 work for static member functions that are pretending to
699 be methods, and because the name may have been changed by
700 asm("new_name"). */
702 /* Get rid of the this parameter on functions that become
703 static. */
708 /* A member template definition only matches a member template
709 declaration. */
713 /* ref-qualifier or absence of same must match. */
718 /* While finding a match, same types and params are not enough
719 if the function is versioned. Also check version ("target")
720 attributes. */
725 && (!is_template
734 }
736 {
740 }
751 {
756 {
758 {
761 {
764 }
765 }
766 else
768 }
773 else
776 }
777 }
780 else
787 }
789 /* DECL is a function with vague linkage. Remember it so that at the
790 end of the translation unit we can decide whether or not to emit
791 it. */
793 void
795 {
798 }
800 /* As above, but for variable template instantiations. */
802 void
804 {
806 }
808 /* We have just processed the DECL, which is a static data member.
809 The other parameters are as for cp_finish_decl. */
811 void
814 tree asmspec_tree,
816 {
819 /* We cannot call pushdecl here, because that would fill in the
820 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
821 the right thing, namely, to put this decl out straight away. */
827 /* We already complained about the template definition. */
831 else
835 {
841 }
850 }
852 /* DECLARATOR and DECLSPECS correspond to a class member. The other
853 parameters are as for cp_finish_decl. Return the DECL for the
854 class member declared. */
856 tree
860 tree asmspec_tree,
861 tree attrlist)
862 {
863 tree value;
866 tree name;
876 /* friend or constructor went bad. */
882 {
885 }
887 /* Pass friendly classes back. */
895 {
897 {
900 }
905 value);
906 }
908 /* Stash away type declarations. */
910 {
915 {
918 /* If this is a typedef that names the class for linkage purposes
919 (7.1.3p8), apply any attributes directly to the type. */
925 }
932 /* It's important that push_template_decl below follows
933 set_underlying_type above so that the created template
934 carries the properly set type of VALUE. */
940 }
945 {
948 }
954 {
956 {
958 {
962 }
964 {
966 {
970 }
971 }
975 {
980 else
982 value);
983 }
984 else
985 {
989 value);
990 else
992 value);
993 }
994 }
999 }
1001 /* Pass friend decls back. */
1007 /* Need to set this before push_template_decl. */
1012 {
1016 }
1023 else
1027 {
1052 /* Pass friends back this way. */
1061 }
1063 }
1065 /* Like `grokfield', but for bitfields.
1066 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1068 tree
1071 tree attrlist)
1072 {
1080 /* Pass friendly classes back. */
1087 {
1090 }
1093 {
1096 }
1098 /* Usually, finish_struct_1 catches bitfields with invalid types.
1099 But, in the case of bitfields with function type, we confuse
1100 ourselves into thinking they are member functions, so we must
1101 check here. */
1103 {
1107 }
1110 {
1114 }
1117 {
1120 }
1124 {
1125 /* The width must be an integer type. */
1132 }
1140 }
1142 \f
1143 /* Returns true iff ATTR is an attribute which needs to be applied at
1144 instantiation time rather than template definition time. */
1146 static bool
1148 {
1152 tree arg;
1155 /* Unknown attribute. */
1158 /* Attribute weak handling wants to write out assembly right away. */
1162 /* Attribute unused is applied directly, as it appertains to
1163 decls. */
1167 /* #pragma omp declare simd attribute needs to be always deferred. */
1172 /* An attribute pack is clearly dependent. */
1176 /* If any of the arguments are dependent expressions, we can't evaluate
1177 the attribute until instantiation time. */
1179 {
1182 /* If the first attribute argument is an identifier, only consider
1183 second and following arguments. Attributes like mode, format,
1184 cleanup and several target specific attributes aren't late
1185 just because they have an IDENTIFIER_NODE as first argument. */
1192 }
1197 {
1200 /* We can't apply any attributes to a completely unknown type until
1201 instantiation time. */
1207 /* Also defer most attributes on dependent types. This is not
1208 necessary in all cases, but is the better default. */
1210 /* But some attributes specifically apply to templates. */
1215 else
1217 }
1218 else
1220 }
1222 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1223 applied at instantiation time and return them. If IS_DEPENDENT is true,
1224 the declaration itself is dependent, so all attributes should be applied
1225 at instantiation time. */
1227 static tree
1229 {
1238 {
1240 {
1246 }
1247 else
1249 }
1252 }
1254 /* Remove any late attributes from the list in ATTR_P and attach them to
1255 DECL_P. */
1257 static void
1259 {
1271 else
1276 /* Merge the late attributes at the beginning with the attribute
1277 list. */
1282 {
1283 /* We've added new attributes directly to the main variant, so
1284 now we need to update all of the other variants to include
1285 these new attributes. */
1286 tree variant;
1289 {
1292 }
1293 }
1294 }
1296 /* Return true iff ATTRS are acceptable attributes to be applied in-place
1297 to a typedef which gives a previously anonymous class or enum a name for
1298 linkage purposes. */
1300 bool
1302 {
1304 {
1308 }
1310 }
1312 /* Like reconstruct_complex_type, but handle also template trees. */
1314 tree
1316 {
1321 {
1325 }
1327 {
1331 }
1333 {
1336 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1337 element type qualification will be handled by the recursive
1338 cp_reconstruct_complex_type call and cp_build_qualified_type
1339 for ARRAY_TYPEs changes the element type. */
1341 }
1343 {
1350 }
1352 {
1355 /* The build_method_type_directly() routine prepends 'this' to argument list,
1356 so we must compensate by getting rid of it. */
1357 outer
1358 = build_method_type_directly
1361 }
1363 {
1366 }
1367 else
1378 }
1380 /* Replaces any constexpr expression that may be into the attributes
1381 arguments with their reduced value. */
1383 static void
1385 {
1389 tree attr;
1391 {
1392 tree arg;
1394 {
1398 }
1399 }
1400 }
1402 /* Return true if TYPE is an OpenMP mappable type. */
1403 bool
1405 {
1406 /* Mappable type has to be complete. */
1409 /* Arrays have mappable type if the elements have mappable type. */
1412 /* A mappable type cannot contain virtual members. */
1415 /* All data members must be non-static. */
1417 {
1418 tree field;
1422 /* All fields must have mappable types. */
1426 }
1428 }
1430 /* Like decl_attributes, but handle C++ complexity. */
1432 void
1434 {
1439 /* Add implicit "omp declare target" attribute if requested. */
1444 {
1459 else
1462 }
1465 {
1470 }
1478 {
1479 attributes
1483 }
1484 else
1490 /* Propagate deprecation out to the template. */
1493 {
1499 }
1500 }
1501 \f
1502 /* Walks through the namespace- or function-scope anonymous union
1503 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1504 Returns one of the fields for use in the mangled name. */
1506 static tree
1508 {
1510 tree field;
1512 /* Rather than write the code to handle the non-union case,
1513 just give an error. */
1515 {
1518 }
1523 {
1524 tree decl;
1525 tree ref;
1530 {
1534 }
1544 else
1549 {
1550 tree base;
1566 }
1569 else
1574 }
1577 }
1579 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1580 anonymous union, then all members must be laid out together. PUBLIC_P
1581 is nonzero if this union is not declared static. */
1583 void
1585 {
1586 tree type;
1587 tree main_decl;
1596 /* The VAR_DECL's context is the same as the TYPE's context. */
1603 {
1606 }
1612 {
1615 }
1618 {
1619 /* Use main_decl to set the mangled name. */
1625 }
1629 }
1630 \f
1631 /* Auxiliary functions to make type signatures for
1632 `operator new' and `operator delete' correspond to
1633 what compiler will be expecting. */
1635 tree
1637 {
1644 {
1647 }
1650 {
1652 {
1653 /* [basic.stc.dynamic.allocation]
1655 The first parameter shall not have an associated default
1656 argument. */
1659 /* Throw away the default argument. */
1661 }
1664 {
1667 }
1668 }
1669 else
1677 {
1680 /* Fall through. */
1682 type = build_exception_variant
1685 /* Fall through. */
1687 }
1689 }
1691 tree
1693 {
1700 {
1703 }
1707 {
1712 ptr_type_node);
1713 }
1715 {
1718 /* Fall through. */
1720 type = build_exception_variant
1723 /* Fall through. */
1725 }
1728 }
1729 \f
1730 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1731 and mark them as needed. */
1733 static void
1735 {
1736 tree fnaddr;
1741 {
1742 tree fn;
1748 /* This entry is an offset: a virtual base class offset, a
1749 virtual call offset, an RTTI offset, etc. */
1754 /* When we don't have vcall offsets, we output thunks whenever
1755 we output the vtables that contain them. With vcall offsets,
1756 we know all the thunks we'll need when we emit a virtual
1757 function, so we emit the thunks there instead. */
1761 }
1762 }
1764 /* Set DECL up to have the closest approximation of "initialized common"
1765 linkage available. */
1767 void
1769 {
1774 /* We can just emit function and compiler-generated variables
1775 statically; having multiple copies is (for the most part) only
1776 a waste of space.
1778 There are two correctness issues, however: the address of a
1779 template instantiation with external linkage should be the
1780 same, independent of what translation unit asks for the
1781 address, and this will not hold when we emit multiple copies of
1782 the function. However, there's little else we can do.
1784 Also, by default, the typeinfo implementation assumes that
1785 there will be only one copy of the string used as the name for
1786 each type. Therefore, if weak symbols are unavailable, the
1787 run-time library should perform a more conservative check; it
1788 should perform a string comparison, rather than an address
1789 comparison. */
1791 else
1792 {
1793 /* Static data member template instantiations, however, cannot
1794 have multiple copies. */
1799 {
1802 }
1804 {
1805 /* We can't do anything useful; leave vars for explicit
1806 instantiation. */
1809 }
1810 }
1813 }
1815 /* For win32 we also want to put explicit instantiations in
1816 linkonce sections, so that they will be merged with implicit
1817 instantiations; otherwise we get duplicate symbol errors.
1818 For Darwin we do not want explicit instantiations to be
1819 linkonce. */
1821 void
1823 {
1824 /* We used to say that this was not necessary on targets that support weak
1825 symbols, because the implicit instantiations will defer to the explicit
1826 one. However, that's not actually the case in SVR4; a strong definition
1827 after a weak one is an error. Also, not making explicit
1828 instantiations one_only means that we can end up with two copies of
1829 some template instantiations. */
1833 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1834 we can get away with not emitting them if they aren't used. We need
1835 to for variables so that cp_finish_decl will update their linkage,
1836 because their DECL_INITIAL may not have been set properly yet. */
1841 {
1845 {
1848 /* Mark it needed so we don't forget to emit it. */
1851 }
1852 }
1853 }
1855 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1856 This predicate will give the right answer during parsing of the
1857 function, which other tests may not. */
1859 bool
1861 {
1863 {
1866 }
1867 /* Unfortunately, import_export_decl has not always been called
1868 before the function is processed, so we cannot simply check
1869 DECL_COMDAT. */
1877 /* A local static in an inline effectively has vague linkage. */
1880 else
1882 }
1884 /* Determine whether or not we want to specifically import or export CTYPE,
1885 using various heuristics. */
1887 static void
1889 {
1890 /* -1 for imported, 1 for exported. */
1893 /* It only makes sense to call this function at EOF. The reason is
1894 that this function looks at whether or not the first non-inline
1895 non-abstract virtual member function has been defined in this
1896 translation unit. But, we can't possibly know that until we've
1897 seen the entire translation unit. */
1903 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1904 we will have CLASSTYPE_INTERFACE_ONLY set but not
1905 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1906 heuristic because someone will supply a #pragma implementation
1907 elsewhere, and deducing it here would produce a conflict. */
1917 /* For a template class, without -fimplicit-templates, check the
1918 repository. If the virtual table is assigned to this
1919 translation unit, then export the class; otherwise, import
1920 it. */
1923 {
1924 /* The ABI specifies that the virtual table and associated
1925 information are emitted with the key method, if any. */
1927 /* If weak symbol support is not available, then we must be
1928 careful not to emit the vtable when the key function is
1929 inline. An inline function can be defined in multiple
1930 translation units. If we were to emit the vtable in each
1931 translation unit containing a definition, we would get
1932 multiple definition errors at link-time. */
1935 }
1937 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1938 a definition anywhere else. */
1942 /* Allow back ends the chance to overrule the decision. */
1947 {
1950 }
1951 }
1953 /* Return true if VAR has already been provided to the back end; in that
1954 case VAR should not be modified further by the front end. */
1955 static bool
1957 {
1959 }
1961 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1962 must be emitted in this translation unit. Mark it as such. */
1964 void
1966 {
1969 {
1970 /* Extern inline functions don't become needed when referenced.
1971 If we know a method will be emitted in other TU and no new
1972 functions can be marked reachable, just use the external
1973 definition. */
1977 /* #pragma interface and -frepo code can call mark_needed for
1978 maybe-in-charge 'tors; mark the clones as well. */
1979 tree clone;
1982 }
1984 {
1986 /* C++ frontend use mark_decl_references to force COMDAT variables
1987 to be output that might appear dead otherwise. */
1989 }
1990 }
1992 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1993 returns true if a definition of this entity should be provided in
1994 this object file. Callers use this function to determine whether
1995 or not to let the back end know that a definition of DECL is
1996 available in this translation unit. */
1998 bool
2000 {
2002 /* This function should only be called at the end of the translation
2003 unit. We cannot be sure of whether or not something will be
2004 COMDAT until that point. */
2007 /* All entities with external linkage that are not COMDAT/EXTERN should be
2008 emitted; they may be referred to from other object files. */
2011 /* Functions marked "dllexport" must be emitted so that they are
2012 visible to other DLLs. */
2017 /* When not optimizing, do not bother to produce definitions for extern
2018 symbols. */
2027 /* If this entity was used, let the back end see it; it will decide
2028 whether or not to emit it into the object file. */
2031 /* Virtual functions might be needed for devirtualization. */
2036 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
2037 reference to DECL might cause it to be emitted later. */
2039 }
2041 /* If necessary, write out the vtables for the dynamic class CTYPE.
2042 Returns true if any vtables were emitted. */
2044 static bool
2046 {
2047 tree vtbl;
2048 tree primary_vtbl;
2052 /* If the vtables for this class have already been emitted there is
2053 nothing more to do. */
2057 /* Ignore dummy vtables made by get_vtable_decl. */
2061 /* On some targets, we cannot determine the key method until the end
2062 of the translation unit -- which is when this function is
2063 called. */
2067 /* See if any of the vtables are needed. */
2069 {
2073 }
2075 {
2076 /* If the references to this class' vtables are optimized away,
2077 still emit the appropriate debugging information. See
2078 dfs_debug_mark. */
2083 }
2085 /* The ABI requires that we emit all of the vtables if we emit any
2086 of them. */
2088 {
2089 /* Mark entities references from the virtual table as used. */
2093 {
2096 LOOKUP_NORMAL);
2098 /* It had better be all done at compile-time. */
2100 }
2102 /* Write it out. */
2106 /* Because we're only doing syntax-checking, we'll never end up
2107 actually marking the variable as written. */
2111 {
2116 }
2117 }
2119 /* Since we're writing out the vtable here, also write the debug
2120 info. */
2124 }
2126 /* A special return value from type_visibility meaning internal
2127 linkage. */
2131 /* walk_tree helper function for type_visibility. */
2133 static tree
2135 {
2138 {
2140 }
2143 {
2146 }
2151 }
2153 /* Returns the visibility of TYPE, which is the minimum visibility of its
2154 component types. */
2156 static int
2158 {
2162 }
2164 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
2165 specified (or if VISIBILITY is static). If TMPL is true, this
2166 constraint is for a template argument, and takes precedence
2167 over explicitly-specified visibility on the template. */
2169 static void
2171 {
2173 {
2174 /* extern "C" declarations aren't affected by the anonymous
2175 namespace. */
2177 {
2184 {
2189 }
2193 }
2194 }
2197 {
2199 /* This visibility was not specified. */
2201 }
2202 }
2204 /* Constrain the visibility of DECL based on the visibility of its template
2205 arguments. */
2207 static void
2209 {
2210 /* If this is a template instantiation, check the innermost
2211 template args for visibility constraints. The outer template
2212 args are covered by the class check. */
2216 {
2222 else
2223 {
2231 {
2234 else
2236 }
2237 }
2240 }
2241 }
2243 /* Like c_determine_visibility, but with additional C++-specific
2244 behavior.
2246 Function-scope entities can rely on the function's visibility because
2247 it is set in start_preparsed_function.
2249 Class-scope entities cannot rely on the class's visibility until the end
2250 of the enclosing class definition.
2252 Note that because namespaces have multiple independent definitions,
2253 namespace visibility is handled elsewhere using the #pragma visibility
2254 machinery rather than by decorating the namespace declaration.
2256 The goal is for constraints from the type to give a diagnostic, and
2257 other constraints to be applied silently. */
2259 void
2261 {
2267 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2269 /* Only relevant for names with external linkage. */
2273 /* Cloned constructors and destructors get the same visibility as
2274 the underlying function. That should be set up in
2275 maybe_clone_body. */
2282 {
2287 else
2289 }
2292 else
2295 /* If DECL is a member of a class, visibility specifiers on the
2296 class can influence the visibility of the DECL. */
2299 else
2300 {
2301 /* Not a class member. */
2303 /* Virtual tables have DECL_CONTEXT set to their associated class,
2304 so they are automatically handled above. */
2309 {
2310 /* Local statics and classes get the visibility of their
2311 containing function by default, except that
2312 -fvisibility-inlines-hidden doesn't affect them. */
2315 {
2319 }
2320 else
2321 {
2325 {
2329 }
2330 else
2331 {
2335 }
2336 }
2338 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2339 but have no TEMPLATE_INFO, so don't try to check it. */
2341 }
2344 {
2345 /* Under -fvisibility-ms-compat, types are visible by default,
2346 even though their contents aren't. */
2353 else
2355 }
2357 {
2358 /* tinfo visibility is based on the type it's for. */
2359 constrain_visibility
2362 /* Give the target a chance to override the visibility associated
2363 with DECL. */
2369 }
2371 /* Template instantiations and specializations get visibility based
2374 {
2377 else
2378 {
2379 /* Set default visibility to whatever the user supplied with
2380 #pragma GCC visibility or a namespace visibility attribute. */
2383 }
2384 }
2385 }
2388 {
2389 /* If the specialization doesn't specify visibility, use the
2390 visibility from the template. */
2398 {
2402 {
2406 else
2407 {
2411 }
2412 }
2415 /* Template argument visibility outweighs #pragma or namespace
2416 visibility, but not an explicit attribute. */
2418 {
2421 {
2422 /* A class template member with explicit visibility
2423 overrides the class visibility, so we need to apply
2424 all the levels of template args directly. */
2427 {
2430 }
2431 }
2433 /* Limit visibility based on its template arguments. */
2435 }
2436 }
2437 }
2443 /* Names in an anonymous namespace get internal linkage.
2444 This might change once we implement export. */
2447 {
2448 /* Propagate anonymity from type to decl. */
2453 }
2455 /* DR 757: A type without linkage shall not be used as the type of a
2456 variable or function with linkage, unless
2457 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2458 o the variable or function is not used (3.2 [basic.def.odr]) or is
2459 defined in the same translation unit.
2461 Since non-extern "C" decls need to be defined in the same
2462 translation unit, we can make the type internal. */
2465 /* If visibility changed and DECL already has DECL_RTL, ensure
2466 symbol flags are updated. */
2473 }
2475 /* By default, static data members and function members receive
2476 the visibility of their containing class. */
2478 static void
2480 {
2486 else
2487 {
2488 /* Default to the class visibility. */
2492 }
2494 /* Give the target a chance to override the visibility associated
2495 with DECL. */
2499 /* Construction virtual tables are not exported because
2500 they cannot be referred to from other object files;
2501 their name is not standardized by the ABI. */
2507 }
2509 /* Returns true iff DECL is an inline that should get hidden visibility
2510 because of -fvisibility-inlines-hidden. */
2512 static bool
2514 {
2516 /* Don't do this for inline templates; specializations might not be
2517 inline, and we don't want them to inherit the hidden
2518 visibility. We'll set it here for all inline instantiations. */
2519 && !processing_template_decl
2524 }
2526 /* Constrain the visibility of a class TYPE based on the visibility of its
2527 field types. Warn if any fields require lesser visibility. */
2529 void
2531 {
2532 tree binfo;
2533 tree t;
2542 /* Don't warn about visibility if the class has explicit visibility. */
2548 {
2553 {
2558 }
2565 }
2569 {
2573 {
2578 }
2584 }
2585 }
2587 /* Functions for adjusting the visibility of a tagged type and its nested
2588 types and declarations when it gets a name for linkage purposes from a
2589 typedef. */
2594 /* First reset the visibility of all the types. */
2596 static void
2598 {
2603 }
2604 static void
2606 {
2608 }
2610 /* Then reset the visibility of any static data members or member
2611 functions that use those types. */
2613 static void
2615 {
2624 }
2625 static void
2627 {
2629 {
2631 {
2636 }
2638 {
2644 }
2649 {
2652 /* Also update its name, for cxx_dwarf_name. */
2654 }
2657 }
2658 }
2659 static void
2661 {
2663 }
2664 void
2666 {
2669 }
2671 /* Set up our initial idea of what the linkage of DECL should be. */
2673 void
2675 {
2677 /* We've already made a decision as to how this function will
2680 {
2683 {
2687 /* A non-template inline function with external linkage will
2688 always be COMDAT. As we must eventually determine the
2689 linkage of all functions, and as that causes writes to
2690 the data mapped in from the PCH file, it's advantageous
2691 to mark the functions at this point. */
2695 {
2696 /* This function must have external linkage, as
2697 otherwise DECL_INTERFACE_KNOWN would have been
2698 set. */
2702 }
2703 }
2706 }
2707 }
2709 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2710 for DECL has not already been determined, do so now by setting
2711 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2712 function is called entities with vague linkage whose definitions
2713 are available must have TREE_PUBLIC set.
2715 If this function decides to place DECL in COMDAT, it will set
2716 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2717 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2718 callers defer that decision until it is clear that DECL is actually
2719 required. */
2721 void
2723 {
2732 /* We cannot determine what linkage to give to an entity with vague
2733 linkage until the end of the file. For example, a virtual table
2734 for a class will be defined if and only if the key method is
2735 defined in this translation unit. As a further example, consider
2736 that when compiling a translation unit that uses PCH file with
2737 "-frepo" it would be incorrect to make decisions about what
2738 entities to emit when building the PCH; those decisions must be
2739 delayed until the repository information has been processed. */
2741 /* Object file linkage for explicit instantiations is handled in
2742 mark_decl_instantiated. For static variables in functions with
2743 vague linkage, maybe_commonize_var is used.
2745 Therefore, the only declarations that should be provided to this
2746 function are those with external linkage that are:
2748 * implicit instantiations of function templates
2750 * inline function
2752 * implicit instantiations of static data members of class
2753 templates
2755 * virtual tables
2757 * typeinfo objects
2759 Furthermore, all entities that reach this point must have a
2760 definition available in this translation unit.
2762 The following assertions check these conditions. */
2764 /* Any code that creates entities with TREE_PUBLIC cleared should
2765 also set DECL_INTERFACE_KNOWN. */
2771 else
2775 /* Check that a definition of DECL is available in this translation
2776 unit. */
2779 /* Assume that DECL will not have COMDAT linkage. */
2781 /* Assume that DECL will not be imported into this translation
2782 unit. */
2785 /* See if the repository tells us whether or not to emit DECL in
2786 this translation unit. */
2791 {
2792 /* The repository indicates that this entity should be defined
2793 here. Make sure the back end honors that request. */
2795 /* Output the definition as an ordinary strong definition. */
2799 }
2802 /* We have already decided what to do with this DECL; there is no
2803 need to check anything further. */
2804 ;
2806 {
2818 /* The ABI requires that all virtual tables be emitted with
2819 COMDAT linkage. However, on systems where COMDAT symbols
2820 don't show up in the table of contents for a static
2821 archive, or on systems without weak symbols (where we
2822 approximate COMDAT linkage by using internal linkage), the
2823 linker will report errors about undefined symbols because
2824 it will not see the virtual table definition. Therefore,
2825 in the case that we know that the virtual table will be
2826 emitted in only one translation unit, we make the virtual
2827 table an ordinary definition with external linkage. */
2830 {
2831 /* CLASS_TYPE is being exported from this translation unit,
2832 so DECL should be defined here. */
2834 /* If a class is declared in a header with the "extern
2835 template" extension, then it will not be instantiated,
2836 even in translation units that would normally require
2837 it. Often such classes are explicitly instantiated in
2838 one translation unit. Therefore, the explicit
2839 instantiation must be made visible to other translation
2840 units. */
2842 else
2843 {
2844 /* The generic C++ ABI says that class data is always
2845 COMDAT, even if there is a key function. Some
2846 variants (e.g., the ARM EABI) says that class data
2847 only has COMDAT linkage if the class data might be
2848 emitted in more than one translation unit. When the
2849 key method can be inline and is inline, we still have
2850 to arrange for comdat even though
2851 class_data_always_comdat is false. */
2855 {
2856 /* The ABI requires COMDAT linkage. Normally, we
2857 only emit COMDAT things when they are needed;
2858 make sure that we realize that this entity is
2859 indeed needed. */
2862 }
2863 }
2864 }
2868 else
2870 }
2872 {
2875 {
2881 /* If -fno-rtti was specified, then we cannot be sure
2882 that RTTI information will be emitted with the
2883 virtual table of the class, so we must emit it
2884 wherever it is used. */
2887 else
2888 {
2891 {
2897 {
2900 }
2901 }
2902 else
2904 }
2905 }
2906 else
2908 }
2910 {
2911 /* DECL is an implicit instantiation of a function or static
2912 data member. */
2915 || (flag_implicit_inline_templates
2919 else
2920 /* If we are not implicitly generating templates, then mark
2921 this entity as undefined in this translation unit. */
2923 }
2925 {
2927 {
2931 {
2935 && ! flag_implement_inlines
2941 /* Always make artificials weak. */
2944 else
2946 }
2947 }
2948 else
2950 }
2951 else
2955 {
2956 /* If we are importing DECL into this translation unit, mark is
2957 an undefined here. */
2960 }
2962 {
2963 /* If we decided to put DECL in COMDAT, mark it accordingly at
2964 this point. */
2966 }
2969 }
2971 /* Return an expression that performs the destruction of DECL, which
2972 must be a VAR_DECL whose type has a non-trivial destructor, or is
2973 an array whose (innermost) elements have a non-trivial destructor. */
2975 tree
2977 {
2981 }
2983 /* Returns the initialization guard variable for the variable DECL,
2984 which has static storage duration. */
2986 tree
2988 {
2989 tree sname;
2990 tree guard;
2995 {
2996 tree guard_type;
2998 /* We use a type that is big enough to contain a mutex as well
2999 as an integer counter. */
3004 /* The guard should have the same linkage as what it guards. */
3021 }
3023 }
3025 /* Return an atomic load of src with the appropriate memory model. */
3027 static tree
3029 {
3044 }
3046 /* Return those bits of the GUARD variable that should be set when the
3047 guarded entity is actually initialized. */
3049 static tree
3051 {
3053 {
3054 /* We only set the first byte of the guard, in order to leave room
3055 for a mutex in the high-order bits. */
3058 guard);
3061 guard);
3063 }
3066 }
3068 /* Return an expression which determines whether or not the GUARD
3069 variable has already been initialized. */
3071 tree
3073 {
3074 tree guard_value;
3078 else
3081 /* Mask off all but the low bit. */
3083 {
3089 tf_warning_or_error);
3090 }
3097 tf_warning_or_error);
3098 }
3100 /* Return an expression which sets the GUARD variable, indicating that
3101 the variable being guarded has been initialized. */
3103 tree
3105 {
3106 tree guard_init;
3108 /* Set the GUARD to one. */
3114 tf_warning_or_error);
3115 }
3117 /* Returns true iff we can tell that VAR does not have a dynamic
3118 initializer. */
3120 static bool
3122 {
3123 /* If it's defined in another TU, we can't tell. */
3126 /* If it has a non-trivial destructor, registering the destructor
3127 counts as dynamic initialization. */
3130 /* If it's in this TU, its initializer has been processed, unless
3131 it's a case of self-initialization, then DECL_INITIALIZED_P is
3132 false while the initializer is handled by finish_id_expression. */
3135 /* If it has no initializer or a constant one, it's not dynamic. */
3138 }
3140 /* Returns true iff VAR is a variable that needs uses to be
3141 wrapped for possible dynamic initialization. */
3143 static bool
3145 {
3151 }
3153 /* Get the FUNCTION_DECL for the shared TLS init function for this
3154 translation unit. */
3156 static tree
3158 {
3162 {
3165 void_list_node));
3171 }
3173 }
3175 /* Get a FUNCTION_DECL for the init function for the thread_local
3176 variable VAR. The init function will be an alias to the function
3177 that initializes all the non-local TLS variables in the translation
3178 unit. The init function is only used by the wrapper function. */
3180 static tree
3182 {
3183 /* Only C++11 TLS vars need this init fn. */
3187 /* If -fno-extern-tls-init, assume that we don't need to call
3188 a tls init function for a variable defined in another TU. */
3192 #ifdef ASM_OUTPUT_DEF
3193 /* If the variable is internal, or if we can't generate aliases,
3194 call the local init function directly. */
3196 #endif
3202 {
3205 void_list_node));
3214 {
3216 /* If the variable is defined somewhere else and might have static
3217 initialization, make the init function a weak reference. */
3223 else
3225 }
3235 }
3237 }
3239 /* Get a FUNCTION_DECL for the init wrapper function for the thread_local
3240 variable VAR. The wrapper function calls the init function (if any) for
3241 VAR and then returns a reference to VAR. The wrapper function is used
3242 in place of VAR everywhere VAR is mentioned. */
3244 tree
3246 {
3247 /* Only C++11 TLS vars need this wrapper fn. */
3254 {
3255 /* A named rvalue reference is an lvalue, so the wrapper should
3256 always return an lvalue reference. */
3265 /* The wrapper is inline and emitted everywhere var is used. */
3268 {
3270 #ifdef HAVE_GAS_HIDDEN
3271 /* Make the wrapper bind locally; there's no reason to share
3272 the wrapper between multiple shared objects. */
3275 #endif
3276 }
3282 #if 0
3283 /* We want CSE to commonize calls to the wrapper, but marking it as
3284 pure is unsafe since it has side-effects. I guess we need a new
3285 ECF flag even weaker than ECF_PURE. FIXME! */
3287 #endif
3292 }
3294 }
3296 /* At EOF, generate the definition for the TLS wrapper function FN:
3298 T& var_wrapper() {
3299 if (init_fn) init_fn();
3300 return var;
3301 } */
3303 static void
3305 {
3310 /* Only call the init fn if there might be one. */
3312 {
3314 /* If init_fn is a weakref, make sure it exists before calling. */
3316 {
3321 tf_warning_or_error);
3323 }
3327 {
3330 }
3331 }
3332 else
3333 /* If there's no initialization, the wrapper is a constant function. */
3338 }
3340 /* Start the process of running a particular set of global constructors
3341 or destructors. Subroutine of do_[cd]tors. Also called from
3342 vtv_start_verification_constructor_init_function. */
3344 static tree
3346 {
3347 tree body;
3348 tree fndecl;
3351 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
3354 {
3357 #ifdef JOINER
3359 #else
3361 #endif
3364 }
3365 else
3371 NULL_TREE));
3376 /* Mark as artificial because it's not explicitly in the user's
3377 source code. */
3380 /* Mark this declaration as used to avoid spurious warnings. */
3383 /* Mark this function as a global constructor or destructor. */
3386 else
3392 }
3394 /* Finish the process of running a particular set of global constructors
3395 or destructors. Subroutine of do_[cd]tors. */
3397 static void
3399 {
3400 tree fn;
3402 /* Finish up. */
3407 {
3410 }
3411 else
3412 {
3415 }
3418 }
3420 /* The names of the parameters to the function created to handle
3421 initializations and destructions for objects with static storage
3422 duration. */
3426 /* The name of the function we create to handle initializations and
3427 destructions for objects with static storage duration. */
3430 /* The declaration for the __INITIALIZE_P argument. */
3433 /* The declaration for the __PRIORITY argument. */
3436 /* The declaration for the static storage duration function. */
3439 /* All the static storage duration functions created in this
3440 translation unit. */
3443 /* A map from priority levels to information about that priority
3444 level. There may be many such levels, so efficient lookup is
3445 important. */
3448 /* Begins the generation of the function that will handle all
3449 initialization and destruction of objects with static storage
3450 duration. The function generated takes two parameters of type
3451 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
3452 nonzero, it performs initializations. Otherwise, it performs
3453 destructions. It only performs those initializations or
3454 destructions with the indicated __PRIORITY. The generated function
3455 returns no value.
3457 It is assumed that this function will only be called once per
3458 translation unit. */
3460 static tree
3462 {
3463 tree type;
3464 tree body;
3467 /* Create the identifier for this function. It will be of the form
3468 SSDF_IDENTIFIER_<number>. */
3473 NULL_TREE);
3475 /* Create the FUNCTION_DECL itself. */
3478 type);
3482 /* Put this function in the list of functions to be called from the
3483 static constructors and destructors. */
3485 {
3488 /* Take this opportunity to initialize the map from priority
3489 numbers to information about that priority level. */
3492 /*delete_value_fn=*/
3495 /* We always need to generate functions for the
3496 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
3497 priorities later, we'll be sure to find the
3498 DEFAULT_INIT_PRIORITY. */
3500 }
3504 /* Create the argument list. */
3505 initialize_p_decl = cp_build_parm_decl
3509 priority_decl = cp_build_parm_decl
3517 /* Put the function in the global scope. */
3520 /* Start the function itself. This is equivalent to declaring the
3521 function as:
3523 static void __ssdf (int __initialize_p, init __priority_p);
3525 It is static because we only need to call this function from the
3526 various constructor and destructor functions for this module. */
3529 SF_PRE_PARSED);
3531 /* Set up the scope of the outermost block in the function. */
3535 }
3537 /* Finish the generation of the function which performs initialization
3538 and destruction of objects with static storage duration. After
3539 this point, no more such objects can be created. */
3541 static void
3543 {
3544 /* Close out the function. */
3547 }
3549 /* Return the information about the indicated PRIORITY level. If no
3550 code to handle this level has yet been generated, generate the
3551 appropriate prologue. */
3553 static priority_info
3555 {
3556 priority_info pi;
3557 splay_tree_node n;
3562 {
3563 /* Create a new priority information structure, and insert it
3564 into the map. */
3571 }
3572 else
3576 }
3578 /* The effective initialization priority of a DECL. */
3580 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3581 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3582 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3584 /* Whether a DECL needs a guard to protect it against multiple
3585 initialization. */
3587 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3588 || DECL_ONE_ONLY (decl) \
3589 || DECL_WEAK (decl)))
3591 /* Called from one_static_initialization_or_destruction(),
3592 via walk_tree.
3593 Walks the initializer list of a global variable and looks for
3594 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3595 and that have their DECL_CONTEXT() == NULL.
3596 For each such temporary variable, set their DECL_CONTEXT() to
3597 the current function. This is necessary because otherwise
3598 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3599 when trying to refer to a temporary variable that does not have
3600 it's DECL_CONTECT() properly set. */
3601 static tree
3605 {
3609 {
3610 tree var;
3618 }
3621 }
3623 /* Set up to handle the initialization or destruction of DECL. If
3624 INITP is nonzero, we are initializing the variable. Otherwise, we
3625 are destroying it. */
3627 static void
3629 {
3631 tree guard;
3633 /* If we are supposed to destruct and there's a trivial destructor,
3634 nothing has to be done. */
3639 /* Trick the compiler into thinking we are at the file and line
3640 where DECL was declared so that error-messages make sense, and so
3641 that the debugger will show somewhat sensible file and line
3642 information. */
3645 /* Make sure temporary variables in the initialiser all have
3646 their DECL_CONTEXT() set to a value different from NULL_TREE.
3647 This can happen when global variables initialisers are built.
3648 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3649 the temporary variables that might have been generated in the
3650 accompagning initialisers is NULL_TREE, meaning the variables have been
3651 declared in the global namespace.
3652 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3653 of the temporaries are set to the current function decl. */
3655 fix_temporary_vars_context_r,
3656 NULL);
3658 /* Because of:
3660 [class.access.spec]
3662 Access control for implicit calls to the constructors,
3663 the conversion functions, or the destructor called to
3664 create and destroy a static data member is performed as
3665 if these calls appeared in the scope of the member's
3666 class.
3668 we pretend we are in a static member function of the class of
3669 which the DECL is a member. */
3671 {
3674 }
3676 /* Assume we don't need a guard. */
3678 /* We need a guard if this is an object with external linkage that
3679 might be initialized in more than one place. (For example, a
3680 static data member of a template, when the data member requires
3681 construction.) */
3683 {
3684 tree guard_cond;
3688 /* When using __cxa_atexit, we just check the GUARD as we would
3689 for a local static. */
3691 {
3692 /* When using __cxa_atexit, we never try to destroy
3693 anything from a static destructor. */
3696 }
3697 /* If we don't have __cxa_atexit, then we will be running
3698 destructors from .fini sections, or their equivalents. So,
3699 we need to know how many times we've tried to initialize this
3700 object. We do initializations only if the GUARD is zero,
3701 i.e., if we are the first to initialize the variable. We do
3702 destructions only if the GUARD is one, i.e., if we are the
3703 last to destroy the variable. */
3705 guard_cond
3707 EQ_EXPR,
3709 guard,
3711 tf_warning_or_error),
3712 integer_one_node,
3713 tf_warning_or_error);
3714 else
3715 guard_cond
3717 EQ_EXPR,
3719 guard,
3721 tf_warning_or_error),
3722 integer_zero_node,
3723 tf_warning_or_error);
3727 }
3730 /* If we're using __cxa_atexit, we have not already set the GUARD,
3731 so we must do so now. */
3735 /* Perform the initialization or destruction. */
3737 {
3739 {
3742 {
3746 }
3747 }
3749 /* If we're using __cxa_atexit, register a function that calls the
3750 destructor for the object. */
3753 }
3754 else
3757 /* Finish the guard if-stmt, if necessary. */
3759 {
3762 }
3764 /* Now that we're done with DECL we don't need to pretend to be a
3765 member of its class any longer. */
3768 }
3770 /* Generate code to do the initialization or destruction of the decls in VARS,
3771 a TREE_LIST of VAR_DECL with static storage duration.
3772 Whether initialization or destruction is performed is specified by INITP. */
3774 static void
3776 {
3779 /* Build the outer if-stmt to check for initialization or destruction. */
3783 EQ_EXPR,
3784 initialize_p_decl,
3785 cond,
3786 tf_warning_or_error);
3789 /* To make sure dynamic construction doesn't access globals from other
3790 compilation units where they might not be yet constructed, for
3791 -fsanitize=address insert __asan_before_dynamic_init call that
3792 prevents access to either all global variables that need construction
3793 in other compilation units, or at least those that haven't been
3794 initialized yet. Variables that need dynamic construction in
3795 the current compilation unit are kept accessible. */
3802 tree priority_if_stmt;
3804 priority_info pi;
3806 /* If we don't need a destructor, there's nothing to do. Avoid
3807 creating a possibly empty if-stmt. */
3809 {
3812 }
3814 /* Remember that we had an initialization or finalization at this
3815 priority. */
3820 else
3823 /* Conditionalize this initialization on being in the right priority
3824 and being initializing/finalizing appropriately. */
3827 EQ_EXPR,
3828 priority_decl,
3830 tf_warning_or_error);
3833 /* Process initializers with same priority. */
3837 /* Do one initialization or destruction. */
3841 /* Finish up the priority if-stmt body. */
3847 /* Revert what __asan_before_dynamic_init did by calling
3848 __asan_after_dynamic_init. */
3852 /* Finish up the init/destruct if-stmt body. */
3855 }
3857 /* VARS is a list of variables with static storage duration which may
3858 need initialization and/or finalization. Remove those variables
3859 that don't really need to be initialized or finalized, and return
3860 the resulting list. The order in which the variables appear in
3861 VARS is in reverse order of the order in which they should actually
3862 be initialized. The list we return is in the unreversed order;
3863 i.e., the first variable should be initialized first. */
3865 static tree
3867 {
3872 {
3877 /* Deal gracefully with error. */
3879 {
3882 }
3884 /* The only things that can be initialized are variables. */
3887 /* If this object is not defined, we don't need to do anything
3888 here. */
3890 {
3893 }
3895 /* Also, if the initializer already contains errors, we can bail
3896 out now. */
3899 {
3902 }
3904 /* This variable is going to need initialization and/or
3905 finalization, so we add it to the list. */
3909 }
3912 }
3914 /* Make sure we have told the back end about all the variables in
3915 VARS. */
3917 static void
3919 {
3920 tree v;
3923 {
3926 {
3929 }
3930 }
3931 }
3933 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3934 (otherwise) that will initialize all global objects with static
3935 storage duration having the indicated PRIORITY. */
3937 static void
3940 {
3942 tree fndecl;
3943 tree body;
3947 /* ??? */
3948 /* Was: locus->line++; */
3950 /* We use `I' to indicate initialization and `D' to indicate
3951 destruction. */
3954 /* We emit the function lazily, to avoid generating empty
3955 global constructors and destructors. */
3958 /* For Objective-C++, we may need to initialize metadata found in this module.
3959 This must be done _before_ any other static initializations. */
3962 {
3965 }
3967 /* Call the static storage duration function with appropriate
3968 arguments. */
3970 {
3971 /* Calls to pure or const functions will expand to nothing. */
3973 {
3974 tree call;
3981 constructor_p),
3983 priority),
3984 NULL_TREE);
3986 }
3987 }
3989 /* Close out the function. */
3992 }
3994 /* Generate constructor and destructor functions for the priority
3995 indicated by N. */
3997 static int
3999 {
4004 /* Generate the functions themselves, but only if they are really
4005 needed. */
4011 /* Keep iterating. */
4013 }
4015 /* Java requires that we be able to reference a local address for a
4016 method, and not be confused by PLT entries. If supported, create a
4017 hidden alias for all such methods. */
4019 static void
4021 {
4022 #ifndef HAVE_GAS_HIDDEN
4024 #endif
4028 {
4034 {
4035 /* Mangle the name in a predictable way; we need to reference
4036 this from a java compiled object file. */
4047 }
4048 }
4049 }
4051 /* Return C++ property of T, based on given operation OP. */
4053 static int
4055 {
4057 {
4059 {
4067 }
4082 }
4083 }
4085 /* Collect source file references recursively, starting from NAMESPC. */
4087 static void
4089 {
4090 tree t;
4095 /* Iterate over names in this name space. */
4100 /* Dump siblings, if any */
4103 /* Dump children, if any */
4105 }
4107 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
4108 starting from NAMESPC. */
4110 static void
4112 {
4116 /* Collect decls from this namespace */
4119 /* Collect siblings, if any */
4122 /* Collect children, if any */
4124 }
4126 /* Returns true iff there is a definition available for variable or
4127 function DECL. */
4129 static bool
4131 {
4134 else
4135 {
4138 }
4139 }
4141 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
4143 [expr.const]
4145 An integral constant-expression can only involve ... const
4146 variables of integral or enumeration types initialized with
4147 constant expressions ...
4149 C++0x also allows constexpr variables and temporaries initialized
4150 with constant expressions. We handle the former here, but the latter
4151 are just folded away in cxx_eval_constant_expression.
4153 The standard does not require that the expression be non-volatile.
4154 G++ implements the proposed correction in DR 457. */
4156 bool
4158 {
4162 /* We don't know if a template static data member is initialized with
4163 a constant expression until we instantiate its initializer. Even
4164 in the case of a constexpr variable, we can't treat it as a
4165 constant until its initializer is complete in case it's used in
4166 its own initializer. */
4169 }
4171 /* Returns true if DECL could be a symbolic constant variable, depending on
4172 its initializer. */
4174 bool
4176 {
4184 }
4186 /* Complain that DECL uses a type with no linkage. In C++98 mode this is
4187 called from grokfndecl and grokvardecl; in all modes it is called from
4188 cp_write_global_declarations. */
4190 void
4192 {
4194 /* In C++11 it's ok if the decl is defined. */
4198 /* The type that got us on no_linkage_decls must have gotten a name for
4201 /* The type might end up having a typedef name for linkage purposes. */
4204 {
4212 /* DRs 132, 319 and 389 seem to indicate types with
4213 no linkage can only be used to declare extern "C"
4214 entities. Since it's not always an error in the
4215 ISO C++ 90 Standard, we only issue a warning. */
4217 "with no linkage used to declare variable %q#D with "
4219 else
4222 decl);
4227 }
4229 {
4232 "%q#D, declared using local type "
4234 }
4238 else
4241 }
4243 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
4245 static void
4247 {
4249 }
4251 /* Clear DECL_EXTERNAL for NODE. */
4253 static bool
4255 {
4258 }
4260 /* Build up the function to run dynamic initializers for thread_local
4261 variables in this translation unit and alias the init functions for the
4262 individual variables to it. */
4264 static void
4266 {
4276 boolean_type_node);
4290 tf_warning_or_error);
4293 tf_warning_or_error));
4295 {
4300 #ifdef ASM_OUTPUT_DEF
4301 /* Output init aliases even with -fno-extern-tls-init. */
4303 {
4307 cgraph_node *alias
4311 }
4312 #endif
4313 }
4319 }
4321 /* We're at the end of compilation, so generate any mangling aliases that
4322 we've been saving up, if DECL is going to be output and ID2 isn't
4323 already taken by another declaration. */
4325 static void
4327 {
4328 /* If there's a declaration already using this mangled name,
4329 don't create a compatibility alias that conflicts. */
4336 /* Don't create an alias to an unreferenced function. */
4348 else
4350 }
4352 /* Note that we might want to emit an alias with the symbol ID2 for DECL at
4353 the end of translation, for compatibility across bugs in the mangling
4354 implementation. */
4356 void
4358 {
4359 #ifdef ASM_OUTPUT_DEF
4362 else
4363 {
4366 }
4367 #endif
4368 }
4370 static void
4372 {
4374 {
4378 }
4379 }
4381 /* The entire file is now complete. If requested, dump everything
4382 to a file. */
4384 static void
4386 {
4391 {
4394 }
4395 }
4399 /* Check the deallocation functions for CODE to see if we want to warn that
4400 only one was defined. */
4402 static void
4404 {
4410 {
4412 /* We're only interested in usual deallocation functions. */
4417 else
4419 }
4426 }
4428 /* Check the global deallocation functions to see if we want to warn about
4429 defining unsized without sized (or vice versa). */
4431 static void
4433 {
4438 }
4440 /* This routine is called at the end of compilation.
4441 Its job is to create all the code needed to initialize and
4442 destroy the global aggregates. We do the destruction
4443 first, since that way we only need to reverse the decls once. */
4445 void
4447 {
4448 tree vars;
4453 tree decl;
4458 /* Bad parse errors. Just forget about it. */
4463 /* This is the point to write out a PCH if we're doing that.
4464 In that case we do not want to do anything else. */
4466 {
4470 }
4477 /* Handle -fdump-ada-spec[-slim] */
4479 {
4482 else
4486 }
4488 /* FIXME - huh? was input_line -= 1;*/
4490 /* We now have to write out all the stuff we put off writing out.
4491 These include:
4493 o Template specializations that we have not yet instantiated,
4494 but which are needed.
4495 o Initialization and destruction for non-local objects with
4496 static storage duration. (Local objects with static storage
4497 duration are initialized when their scope is first entered,
4498 and are cleaned up via atexit.)
4499 o Virtual function tables.
4501 All of these may cause others to be needed. For example,
4502 instantiating one function may cause another to be needed, and
4503 generating the initializer for an object may cause templates to be
4504 instantiated, etc., etc. */
4508 do
4509 {
4510 tree t;
4511 tree decl;
4515 /* If there are templates that we've put off instantiating, do
4516 them now. */
4520 /* Write out virtual tables as required. Note that writing out
4521 the virtual table for a template class may cause the
4522 instantiation of members of that class. If we write out
4523 vtables then we remove the class from our list so we don't
4524 have to look at it again. */
4528 {
4531 }
4535 {
4539 {
4541 {
4544 }
4545 else
4549 }
4550 }
4552 /* Write out needed type info variables. We have to be careful
4553 looping through unemitted decls, because emit_tinfo_decl may
4554 cause other variables to be needed. New elements will be
4555 appended, and we remove from the vector those that actually
4556 get emitted. */
4560 {
4563 }
4565 /* The list of objects with static storage duration is built up
4566 in reverse order. We clear STATIC_AGGREGATES so that any new
4567 aggregates added during the initialization of these will be
4568 initialized in the correct order when we next come around the
4569 loop. */
4573 {
4574 /* We need to start a new initialization function each time
4575 through the loop. That's because we need to know which
4576 vtables have been referenced, and TREE_SYMBOL_REFERENCED
4577 isn't computed until a function is finished, and written
4578 out. That's a deficiency in the back end. When this is
4579 fixed, these initialization functions could all become
4580 inline, with resulting performance improvements. */
4581 tree ssdf_body;
4583 /* Set the line and file, so that it is obviously not from
4584 the source file. */
4588 /* Make sure the back end knows about all the variables. */
4591 /* First generate code to do all the initializations. */
4595 /* Then, generate code to do all the destructions. Do these
4596 in reverse order so that the most recently constructed
4597 variable is the first destroyed. If we're using
4598 __cxa_atexit, then we don't need to do this; functions
4599 were registered at initialization time to destroy the
4600 local statics. */
4602 {
4605 }
4606 else
4609 /* Finish up the static storage duration function for this
4610 round. */
4614 /* All those initializations and finalizations might cause
4615 us to need more inline functions, more template
4616 instantiations, etc. */
4618 ssdf_count++;
4619 /* ??? was: locus_at_end_of_parsing.line++; */
4620 }
4622 /* Now do the same for thread_local variables. */
4625 /* Go through the set of inline functions whose bodies have not
4626 been emitted yet. If out-of-line copies of these functions
4627 are required, emit them. */
4629 {
4630 /* Does it need synthesizing? */
4633 {
4634 /* Even though we're already at the top-level, we push
4635 there again. That way, when we pop back a few lines
4636 hence, all of our state is restored. Otherwise,
4637 finish_function doesn't clean things up, and we end
4638 up with CURRENT_FUNCTION_DECL set. */
4640 /* The decl's location will mark where it was first
4641 needed. Save that so synthesize method can indicate
4642 where it was needed from, in case of error */
4647 }
4655 /* We lie to the back end, pretending that some functions
4656 are not defined when they really are. This keeps these
4657 functions from being put out unnecessarily. But, we must
4658 stop lying when the functions are referenced, or if they
4659 are not comdat since they need to be put out now. If
4660 DECL_INTERFACE_KNOWN, then we have already set
4661 DECL_EXTERNAL appropriately, so there's no need to check
4662 again, and we do not want to clear DECL_EXTERNAL if a
4663 previous call to import_export_decl set it.
4665 This is done in a separate for cycle, because if some
4666 deferred function is contained in another deferred
4667 function later in deferred_fns varray,
4668 rest_of_compilation would skip this function and we
4669 really cannot expand the same function twice. */
4674 {
4683 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
4684 group, we need to mark all symbols in the same comdat group
4685 that way. */
4692 }
4694 /* If we're going to need to write this function out, and
4695 there's already a body for it, create RTL for it now.
4696 (There might be no body if this is a method we haven't
4697 gotten around to synthesizing yet.) */
4702 {
4703 /* We will output the function; no longer consider it in this
4704 loop. */
4706 /* Generate RTL for this function now that we know we
4707 need it. */
4709 /* If we're compiling -fsyntax-only pretend that this
4710 function has been written out so that we don't try to
4711 expand it again. */
4715 }
4716 }
4721 /* Static data members are just like namespace-scope globals. */
4723 {
4725 /* Don't write it out if we haven't seen a definition. */
4729 /* If this static data member is needed, provide it to the
4730 back end. */
4733 }
4739 retries++;
4740 }
4745 /* All used inline functions must have a definition at this point. */
4747 {
4750 /* If the definition actually was available here, then the
4751 fact that the function was not defined merely represents
4752 that for some reason (use of a template repository,
4753 #pragma interface, etc.) we decided not to emit the
4754 definition here. */
4756 /* Don't complain if the template was defined. */
4760 {
4762 /* Avoid a duplicate warning from check_global_declaration. */
4764 }
4765 }
4767 /* So must decls that use a type with no linkage. */
4773 /* Then, do the Objective-C stuff. This is where all the
4774 Objective-C module stuff gets generated (symtab,
4775 class/protocol/selector lists etc). This must be done after C++
4776 templates, destructors etc. so that selectors used in C++
4777 templates are properly allocated. */
4781 /* We give C linkage to static constructors and destructors. */
4784 /* Generate initialization and destruction functions for all
4785 priorities for which they are required. */
4788 generate_ctor_and_dtor_functions_for_priority,
4791 /* If this is obj-c++ and we need a static init, call
4792 generate_ctor_or_dtor_function. */
4794 DEFAULT_INIT_PRIORITY,
4797 /* We're done with the splay-tree now. */
4801 /* Generate any missing aliases. */
4804 /* We're done with static constructors, so we can go back to "C++"
4805 linkage now. */
4808 /* Generate Java hidden aliases. */
4812 {
4816 }
4822 /* The entire file is now complete. If requested, dump everything
4823 to a file. */
4827 {
4830 }
4834 }
4836 /* Perform any post compilation-proper cleanups for the C++ front-end.
4837 This should really go away. No front-end should need to do
4838 anything past the compilation process. */
4840 void
4842 {
4846 {
4847 /* Generate the special constructor initialization function that
4848 calls __VLTRegisterPairs, and give it a very high
4849 initialization priority. This must be done after
4850 finalize_compilation_unit so that we have accurate
4851 information about which vtable will actually be emitted. */
4853 }
4857 #ifdef ENABLE_CHECKING
4862 }
4864 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4865 function to call in parse-tree form; it has not yet been
4866 semantically analyzed. ARGS are the arguments to the function.
4867 They have already been semantically analyzed. This may change
4868 ARGS. */
4870 tree
4872 tsubst_flags_t complain)
4873 {
4874 tree orig_fn;
4876 tree expr;
4877 tree object;
4883 {
4892 /* Transform the arguments and add the implicit "this"
4893 parameter. That must be done before the FN is transformed
4894 because we depend on the form of FN. */
4898 {
4902 }
4903 /* Now that the arguments are done, transform FN. */
4905 }
4907 /* A qualified name corresponding to a bound pointer-to-member is
4908 represented as an OFFSET_REF:
4910 struct B { void g(); };
4911 void (B::*p)();
4912 void B::g() { (this->*p)(); } */
4914 {
4918 complain);
4920 }
4924 else
4933 }
4936 void
4938 {
4943 {
4947 {
4950 }
4951 }
4952 }
4954 /* Return true if function DECL can be inlined. This is used to force
4955 instantiation of methods that might be interesting for inlining. */
4956 bool
4958 {
4964 /* When optimizing, we might inline everything when flatten
4965 attribute or heuristics inlining for size or autoinlining
4966 is used. */
4968 }
4970 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4971 If DECL is a specialization or implicitly declared class member,
4972 generate the actual definition. Return false if something goes
4973 wrong, true otherwise. */
4975 bool
4977 {
4978 /* If DECL is a BASELINK for a single function, then treat it just
4979 like the DECL for the function. Otherwise, if the BASELINK is
4980 for an overloaded function, we don't know which function was
4981 actually used until after overload resolution. */
4983 {
4988 }
4990 /* Set TREE_USED for the benefit of -Wunused. */
4995 /* Mark enumeration types as used. */
5004 {
5006 {
5009 {
5010 /* We mark a lambda conversion op as deleted if we can't
5011 generate it properly; see maybe_add_lambda_conv_op. */
5015 }
5016 }
5018 {
5022 }
5024 }
5030 /* We can only check DECL_ODR_USED on variables or functions with
5031 DECL_LANG_SPECIFIC set, and these are also the only decls that we
5032 might need special handling for. */
5036 {
5038 {
5042 }
5044 }
5046 /* We only want to do this processing once. We don't need to keep trying
5047 to instantiate inline templates, because unit-at-a-time will make sure
5048 we get them compiled before functions that want to inline them. */
5052 /* If within finish_function, defer the rest until that function
5053 finishes, otherwise it might recurse. */
5055 {
5058 }
5060 /* Normally, we can wait until instantiation-time to synthesize DECL.
5061 However, if DECL is a static data member initialized with a constant
5062 or a constexpr function, we need it right now because a reference to
5063 such a data member or a call to such function is not value-dependent.
5064 For a function that uses auto in the return type, we need to instantiate
5065 it to find out its type. For OpenMP user defined reductions, we need
5066 them instantiated for reduction clauses which inline them by hand
5067 directly. */
5075 {
5076 /* Instantiating a function will result in garbage collection. We
5077 must treat this situation as if we were within the body of a
5078 function so as to avoid collecting live data only referenced from
5079 the stack (such as overload resolution candidates). */
5084 }
5089 /* Check this too in case we're within instantiate_non_dependent_expr. */
5095 {
5099 }
5101 /* If we don't need a value, then we don't need to synthesize DECL. */
5109 /* DR 757: A type without linkage shall not be used as the type of a
5110 variable or function with linkage, unless
5111 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
5112 o the variable or function is not used (3.2 [basic.def.odr]) or is
5113 defined in the same translation unit. */
5120 {
5122 /* There's no way to define a local extern, and adding it to
5123 the vector interferes with GC, so give an error now. */
5125 else
5127 }
5131 /* Remember it, so we can check it was defined. */
5134 /* Is it a synthesized method that needs to be synthesized? */
5138 /* A function defaulted outside the class is synthesized either by
5139 cp_finish_decl or instantiate_decl. */
5142 {
5143 /* Defer virtual destructors so that thunks get the right
5144 linkage. */
5146 {
5149 }
5151 /* Remember the current location for a function we will end up
5152 synthesizing. Then we can inform the user where it was
5153 required in the case of error. */
5156 /* Synthesizing an implicitly defined member function will result in
5157 garbage collection. We must treat this situation as if we were
5158 within the body of a function so as to avoid collecting live data
5159 on the stack (such as overload resolution candidates).
5161 We could just let cp_write_global_declarations handle synthesizing
5162 this function by adding it to deferred_fns, but doing
5163 it at the use site produces better error messages. */
5167 /* If this is a synthesized method we don't need to
5168 do the instantiation test below. */
5169 }
5174 /* If this is a function or variable that is an instance of some
5175 template, we now know that we will need to actually do the
5176 instantiation. We check that DECL is not an explicit
5177 instantiation because that is not checked in instantiate_decl.
5179 We put off instantiating functions in order to improve compile
5180 times. Maintaining a stack of active functions is expensive,
5181 and the inliner knows to instantiate any functions it might
5182 need. Therefore, we always try to defer instantiation. */
5183 {
5188 }
5191 }
5193 bool
5195 {
5197 }
5199 tree
5201 {
5203 }
5205 tree
5207 {
5208 tree fn;
5216 }