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/* Process declarations and variables for C++ compiler. Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. Hacked by Michael Tiemann (tiemann@cygnus.com) This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ /* Process declarations and symbol lookup for C++ front end. Also constructs types; the standard scalar types at initialization, and structure, union, array and enum types when they are declared. */ /* ??? not all decl nodes are given the most useful possible line numbers. For example, the CONST_DECLs for enum values. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "rtl.h" #include "expr.h" #include "flags.h" #include "cp-tree.h" #include "decl.h" #include "output.h" #include "except.h" #include "toplev.h" #include "timevar.h" #include "cpplib.h" #include "target.h" #include "c-common.h" #include "tree-mudflap.h" #include "cgraph.h" #include "tree-inline.h" #include "c-pragma.h" #include "tree-dump.h" #include "intl.h" #include "gimple.h" #include "pointer-set.h" extern cpp_reader *parse_in; /* This structure contains information about the initializations and/or destructions required for a particular priority level. */ typedef struct priority_info_s { /* Nonzero if there have been any initializations at this priority throughout the translation unit. */ int initializations_p; /* Nonzero if there have been any destructions at this priority throughout the translation unit. */ int destructions_p; } *priority_info; static void mark_vtable_entries (tree); static bool maybe_emit_vtables (tree); static bool acceptable_java_type (tree); static tree start_objects (int, int); static void finish_objects (int, int, tree); static tree start_static_storage_duration_function (unsigned); static void finish_static_storage_duration_function (tree); static priority_info get_priority_info (int); static void do_static_initialization_or_destruction (tree, bool); static void one_static_initialization_or_destruction (tree, tree, bool); static void generate_ctor_or_dtor_function (bool, int, location_t *); static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node, void *); static tree prune_vars_needing_no_initialization (tree *); static void write_out_vars (tree); static void import_export_class (tree); static tree get_guard_bits (tree); static void determine_visibility_from_class (tree, tree); static bool decl_defined_p (tree); /* A list of static class variables. This is needed, because a static class variable can be declared inside the class without an initializer, and then initialized, statically, outside the class. */ static GTY(()) VEC(tree,gc) *pending_statics; /* A list of functions which were declared inline, but which we may need to emit outline anyway. */ static GTY(()) VEC(tree,gc) *deferred_fns; /* A list of decls that use types with no linkage, which we need to make sure are defined. */ static GTY(()) VEC(tree,gc) *no_linkage_decls; /* Nonzero if we're done parsing and into end-of-file activities. */ int at_eof; /* Return a member function type (a METHOD_TYPE), given FNTYPE (a FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers that apply to the function). */ tree build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals) { tree raises; tree attrs; int type_quals; if (fntype == error_mark_node || ctype == error_mark_node) return error_mark_node; gcc_assert (TREE_CODE (fntype) == FUNCTION_TYPE || TREE_CODE (fntype) == METHOD_TYPE); type_quals = quals & ~TYPE_QUAL_RESTRICT; ctype = cp_build_qualified_type (ctype, type_quals); raises = TYPE_RAISES_EXCEPTIONS (fntype); attrs = TYPE_ATTRIBUTES (fntype); fntype = build_method_type_directly (ctype, TREE_TYPE (fntype), (TREE_CODE (fntype) == METHOD_TYPE ? TREE_CHAIN (TYPE_ARG_TYPES (fntype)) : TYPE_ARG_TYPES (fntype))); if (raises) fntype = build_exception_variant (fntype, raises); if (attrs) fntype = cp_build_type_attribute_variant (fntype, attrs); return fntype; } /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its return type changed to NEW_RET. */ tree change_return_type (tree new_ret, tree fntype) { tree newtype; tree args = TYPE_ARG_TYPES (fntype); tree raises = TYPE_RAISES_EXCEPTIONS (fntype); tree attrs = TYPE_ATTRIBUTES (fntype); if (same_type_p (new_ret, TREE_TYPE (fntype))) return fntype; if (TREE_CODE (fntype) == FUNCTION_TYPE) newtype = build_function_type (new_ret, args); else newtype = build_method_type_directly (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fntype))), new_ret, TREE_CHAIN (args)); if (raises) newtype = build_exception_variant (newtype, raises); if (attrs) newtype = cp_build_type_attribute_variant (newtype, attrs); return newtype; } /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE appropriately. */ tree cp_build_parm_decl (tree name, tree type) { tree parm = build_decl (input_location, PARM_DECL, name, type); /* DECL_ARG_TYPE is only used by the back end and the back end never sees templates. */ if (!processing_template_decl) DECL_ARG_TYPE (parm) = type_passed_as (type); /* If the type is a pack expansion, then we have a function parameter pack. */ if (type && TREE_CODE (type) == TYPE_PACK_EXPANSION) FUNCTION_PARAMETER_PACK_P (parm) = 1; return parm; } /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the indicated NAME. */ tree build_artificial_parm (tree name, tree type) { tree parm = cp_build_parm_decl (name, type); DECL_ARTIFICIAL (parm) = 1; /* All our artificial parms are implicitly `const'; they cannot be assigned to. */ TREE_READONLY (parm) = 1; return parm; } /* Constructors for types with virtual baseclasses need an "in-charge" flag saying whether this constructor is responsible for initialization of virtual baseclasses or not. All destructors also need this "in-charge" flag, which additionally determines whether or not the destructor should free the memory for the object. This function adds the "in-charge" flag to member function FN if appropriate. It is called from grokclassfn and tsubst. FN must be either a constructor or destructor. The in-charge flag follows the 'this' parameter, and is followed by the VTT parm (if any), then the user-written parms. */ void maybe_retrofit_in_chrg (tree fn) { tree basetype, arg_types, parms, parm, fntype; /* If we've already add the in-charge parameter don't do it again. */ if (DECL_HAS_IN_CHARGE_PARM_P (fn)) return; /* When processing templates we can't know, in general, whether or not we're going to have virtual baseclasses. */ if (processing_template_decl) return; /* We don't need an in-charge parameter for constructors that don't have virtual bases. */ if (DECL_CONSTRUCTOR_P (fn) && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) return; arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn)); basetype = TREE_TYPE (TREE_VALUE (arg_types)); arg_types = TREE_CHAIN (arg_types); parms = TREE_CHAIN (DECL_ARGUMENTS (fn)); /* If this is a subobject constructor or destructor, our caller will pass us a pointer to our VTT. */ if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn))) { parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type); /* First add it to DECL_ARGUMENTS between 'this' and the real args... */ TREE_CHAIN (parm) = parms; parms = parm; /* ...and then to TYPE_ARG_TYPES. */ arg_types = hash_tree_chain (vtt_parm_type, arg_types); DECL_HAS_VTT_PARM_P (fn) = 1; } /* Then add the in-charge parm (before the VTT parm). */ parm = build_artificial_parm (in_charge_identifier, integer_type_node); TREE_CHAIN (parm) = parms; parms = parm; arg_types = hash_tree_chain (integer_type_node, arg_types); /* Insert our new parameter(s) into the list. */ TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms; /* And rebuild the function type. */ fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)), arg_types); if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))) fntype = build_exception_variant (fntype, TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn))); if (TYPE_ATTRIBUTES (TREE_TYPE (fn))) fntype = (cp_build_type_attribute_variant (fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn)))); TREE_TYPE (fn) = fntype; /* Now we've got the in-charge parameter. */ DECL_HAS_IN_CHARGE_PARM_P (fn) = 1; } /* Classes overload their constituent function names automatically. When a function name is declared in a record structure, its name is changed to it overloaded name. Since names for constructors and destructors can conflict, we place a leading '$' for destructors. CNAME is the name of the class we are grokking for. FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'. FLAGS contains bits saying what's special about today's arguments. DTOR_FLAG == DESTRUCTOR. If FUNCTION is a destructor, then we must add the `auto-delete' field as a second parameter. There is some hair associated with the fact that we must "declare" this variable in the manner consistent with the way the rest of the arguments were declared. QUALS are the qualifiers for the this pointer. */ void grokclassfn (tree ctype, tree function, enum overload_flags flags) { tree fn_name = DECL_NAME (function); /* Even within an `extern "C"' block, members get C++ linkage. See [dcl.link] for details. */ SET_DECL_LANGUAGE (function, lang_cplusplus); if (fn_name == NULL_TREE) { error ("name missing for member function"); fn_name = get_identifier ("<anonymous>"); DECL_NAME (function) = fn_name; } DECL_CONTEXT (function) = ctype; if (flags == DTOR_FLAG) DECL_DESTRUCTOR_P (function) = 1; if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function)) maybe_retrofit_in_chrg (function); } /* Create an ARRAY_REF, checking for the user doing things backwards along the way. */ tree grok_array_decl (tree array_expr, tree index_exp) { tree type; tree expr; tree orig_array_expr = array_expr; tree orig_index_exp = index_exp; if (error_operand_p (array_expr) || error_operand_p (index_exp)) return error_mark_node; if (processing_template_decl) { if (type_dependent_expression_p (array_expr) || type_dependent_expression_p (index_exp)) return build_min_nt (ARRAY_REF, array_expr, index_exp, NULL_TREE, NULL_TREE); array_expr = build_non_dependent_expr (array_expr); index_exp = build_non_dependent_expr (index_exp); } type = TREE_TYPE (array_expr); gcc_assert (type); type = non_reference (type); /* If they have an `operator[]', use that. */ if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp))) expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL, array_expr, index_exp, NULL_TREE, /*overloaded_p=*/NULL, tf_warning_or_error); else { tree p1, p2, i1, i2; /* Otherwise, create an ARRAY_REF for a pointer or array type. It is a little-known fact that, if `a' is an array and `i' is an int, you can write `i[a]', which means the same thing as `a[i]'. */ if (TREE_CODE (type) == ARRAY_TYPE) p1 = array_expr; else p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false); if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE) p2 = index_exp; else p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false); i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr, false); i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp, false); if ((p1 && i2) && (i1 && p2)) error ("ambiguous conversion for array subscript"); if (p1 && i2) array_expr = p1, index_exp = i2; else if (i1 && p2) array_expr = p2, index_exp = i1; else { error ("invalid types %<%T[%T]%> for array subscript", type, TREE_TYPE (index_exp)); return error_mark_node; } if (array_expr == error_mark_node || index_exp == error_mark_node) error ("ambiguous conversion for array subscript"); expr = build_array_ref (input_location, array_expr, index_exp); } if (processing_template_decl && expr != error_mark_node) return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp, NULL_TREE, NULL_TREE); return expr; } /* Given the cast expression EXP, checking out its validity. Either return an error_mark_node if there was an unavoidable error, return a cast to void for trying to delete a pointer w/ the value 0, or return the call to delete. If DOING_VEC is true, we handle things differently for doing an array delete. Implements ARM $5.3.4. This is called from the parser. */ tree delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete) { tree t, type; if (exp == error_mark_node) return exp; if (processing_template_decl) { t = build_min (DELETE_EXPR, void_type_node, exp, size); DELETE_EXPR_USE_GLOBAL (t) = use_global_delete; DELETE_EXPR_USE_VEC (t) = doing_vec; TREE_SIDE_EFFECTS (t) = 1; return t; } /* An array can't have been allocated by new, so complain. */ if (TREE_CODE (exp) == VAR_DECL && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE) warning (0, "deleting array %q#D", exp); t = build_expr_type_conversion (WANT_POINTER, exp, true); if (t == NULL_TREE || t == error_mark_node) { error ("type %q#T argument given to %<delete%>, expected pointer", TREE_TYPE (exp)); return error_mark_node; } type = TREE_TYPE (t); /* As of Valley Forge, you can delete a pointer to const. */ /* You can't delete functions. */ if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) { error ("cannot delete a function. Only pointer-to-objects are " "valid arguments to %<delete%>"); return error_mark_node; } /* Deleting ptr to void is undefined behavior [expr.delete/3]. */ if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE) { warning (0, "deleting %qT is undefined", type); doing_vec = 0; } /* Deleting a pointer with the value zero is valid and has no effect. */ if (integer_zerop (t)) return build1 (NOP_EXPR, void_type_node, t); if (doing_vec) return build_vec_delete (t, /*maxindex=*/NULL_TREE, sfk_deleting_destructor, use_global_delete); else return build_delete (type, t, sfk_deleting_destructor, LOOKUP_NORMAL, use_global_delete); } /* Report an error if the indicated template declaration is not the sort of thing that should be a member template. */ void check_member_template (tree tmpl) { tree decl; gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL); decl = DECL_TEMPLATE_RESULT (tmpl); if (TREE_CODE (decl) == FUNCTION_DECL || (TREE_CODE (decl) == TYPE_DECL && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl)))) { /* The parser rejects template declarations in local classes. */ gcc_assert (!current_function_decl); /* The parser rejects any use of virtual in a function template. */ gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))); /* The debug-information generating code doesn't know what to do with member templates. */ DECL_IGNORED_P (tmpl) = 1; } else error ("template declaration of %q#D", decl); } /* Return true iff TYPE is a valid Java parameter or return type. */ static bool acceptable_java_type (tree type) { if (type == error_mark_node) return false; if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type)) return true; if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE) { type = TREE_TYPE (type); if (TREE_CODE (type) == RECORD_TYPE) { tree args; int i; if (! TYPE_FOR_JAVA (type)) return false; if (! CLASSTYPE_TEMPLATE_INFO (type)) return true; args = CLASSTYPE_TI_ARGS (type); i = TREE_VEC_LENGTH (args); while (--i >= 0) { type = TREE_VEC_ELT (args, i); if (TREE_CODE (type) == POINTER_TYPE) type = TREE_TYPE (type); if (! TYPE_FOR_JAVA (type)) return false; } return true; } } return false; } /* For a METHOD in a Java class CTYPE, return true if the parameter and return types are valid Java types. Otherwise, print appropriate error messages, and return false. */ bool check_java_method (tree method) { bool jerr = false; tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method)); tree ret_type = TREE_TYPE (TREE_TYPE (method)); if (!acceptable_java_type (ret_type)) { error ("Java method %qD has non-Java return type %qT", method, ret_type); jerr = true; } arg_types = TREE_CHAIN (arg_types); if (DECL_HAS_IN_CHARGE_PARM_P (method)) arg_types = TREE_CHAIN (arg_types); if (DECL_HAS_VTT_PARM_P (method)) arg_types = TREE_CHAIN (arg_types); for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types)) { tree type = TREE_VALUE (arg_types); if (!acceptable_java_type (type)) { if (type != error_mark_node) error ("Java method %qD has non-Java parameter type %qT", method, type); jerr = true; } } return !jerr; } /* Sanity check: report error if this function FUNCTION is not really a member of the class (CTYPE) it is supposed to belong to. TEMPLATE_PARMS is used to specify the template parameters of a member template passed as FUNCTION_DECL. If the member template is passed as a TEMPLATE_DECL, it can be NULL since the parameters can be extracted from the declaration. If the function is not a function template, it must be NULL. It returns the original declaration for the function, NULL_TREE if no declaration was found, error_mark_node if an error was emitted. */ tree check_classfn (tree ctype, tree function, tree template_parms) { int ix; bool is_template; tree pushed_scope; if (DECL_USE_TEMPLATE (function) && !(TREE_CODE (function) == TEMPLATE_DECL && DECL_TEMPLATE_SPECIALIZATION (function)) && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function))) /* Since this is a specialization of a member template, we're not going to find the declaration in the class. For example, in: struct S { template <typename T> void f(T); }; template <> void S::f(int); we're not going to find `S::f(int)', but there's no reason we should, either. We let our callers know we didn't find the method, but we don't complain. */ return NULL_TREE; /* Basic sanity check: for a template function, the template parameters either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */ if (TREE_CODE (function) == TEMPLATE_DECL) { if (template_parms && !comp_template_parms (template_parms, DECL_TEMPLATE_PARMS (function))) { error ("template parameter lists provided don't match the " "template parameters of %qD", function); return error_mark_node; } template_parms = DECL_TEMPLATE_PARMS (function); } /* OK, is this a definition of a member template? */ is_template = (template_parms != NULL_TREE); /* We must enter the scope here, because conversion operators are named by target type, and type equivalence relies on typenames resolving within the scope of CTYPE. */ pushed_scope = push_scope (ctype); ix = class_method_index_for_fn (complete_type (ctype), function); if (ix >= 0) { VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype); tree fndecls, fndecl = 0; bool is_conv_op; const char *format = NULL; for (fndecls = VEC_index (tree, methods, ix); fndecls; fndecls = OVL_NEXT (fndecls)) { tree p1, p2; fndecl = OVL_CURRENT (fndecls); p1 = TYPE_ARG_TYPES (TREE_TYPE (function)); p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); /* We cannot simply call decls_match because this doesn't work for static member functions that are pretending to be methods, and because the name may have been changed by asm("new_name"). */ /* Get rid of the this parameter on functions that become static. */ if (DECL_STATIC_FUNCTION_P (fndecl) && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE) p1 = TREE_CHAIN (p1); /* A member template definition only matches a member template declaration. */ if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL)) continue; if (same_type_p (TREE_TYPE (TREE_TYPE (function)), TREE_TYPE (TREE_TYPE (fndecl))) && compparms (p1, p2) && (!is_template || comp_template_parms (template_parms, DECL_TEMPLATE_PARMS (fndecl))) && (DECL_TEMPLATE_SPECIALIZATION (function) == DECL_TEMPLATE_SPECIALIZATION (fndecl)) && (!DECL_TEMPLATE_SPECIALIZATION (function) || (DECL_TI_TEMPLATE (function) == DECL_TI_TEMPLATE (fndecl)))) break; } if (fndecls) { if (pushed_scope) pop_scope (pushed_scope); return OVL_CURRENT (fndecls); } error_at (DECL_SOURCE_LOCATION (function), "prototype for %q#D does not match any in class %qT", function, ctype); is_conv_op = DECL_CONV_FN_P (fndecl); if (is_conv_op) ix = CLASSTYPE_FIRST_CONVERSION_SLOT; fndecls = VEC_index (tree, methods, ix); while (fndecls) { fndecl = OVL_CURRENT (fndecls); fndecls = OVL_NEXT (fndecls); if (!fndecls && is_conv_op) { if (VEC_length (tree, methods) > (size_t) ++ix) { fndecls = VEC_index (tree, methods, ix); if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls))) { fndecls = NULL_TREE; is_conv_op = false; } } else is_conv_op = false; } if (format) format = " %+#D"; else if (fndecls) format = N_("candidates are: %+#D"); else format = N_("candidate is: %+#D"); error (format, fndecl); } } else if (!COMPLETE_TYPE_P (ctype)) cxx_incomplete_type_error (function, ctype); else error ("no %q#D member function declared in class %qT", function, ctype); if (pushed_scope) pop_scope (pushed_scope); return error_mark_node; } /* DECL is a function with vague linkage. Remember it so that at the end of the translation unit we can decide whether or not to emit it. */ void note_vague_linkage_fn (tree decl) { DECL_DEFER_OUTPUT (decl) = 1; VEC_safe_push (tree, gc, deferred_fns, decl); } /* We have just processed the DECL, which is a static data member. The other parameters are as for cp_finish_decl. */ void finish_static_data_member_decl (tree decl, tree init, bool init_const_expr_p, tree asmspec_tree, int flags) { DECL_CONTEXT (decl) = current_class_type; /* We cannot call pushdecl here, because that would fill in the TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do the right thing, namely, to put this decl out straight away. */ if (! processing_template_decl) VEC_safe_push (tree, gc, pending_statics, decl); if (LOCAL_CLASS_P (current_class_type)) permerror (input_location, "local class %q#T shall not have static data member %q#D", current_class_type, decl); /* Static consts need not be initialized in the class definition. */ if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl))) { static int explained = 0; error ("initializer invalid for static member with constructor"); if (!explained) { error ("(an out of class initialization is required)"); explained = 1; } init = NULL_TREE; } DECL_INITIAL (decl) = init; DECL_IN_AGGR_P (decl) = 1; cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags); } /* DECLARATOR and DECLSPECS correspond to a class member. The other parameters are as for cp_finish_decl. Return the DECL for the class member declared. */ tree grokfield (const cp_declarator *declarator, cp_decl_specifier_seq *declspecs, tree init, bool init_const_expr_p, tree asmspec_tree, tree attrlist) { tree value; const char *asmspec = 0; int flags = LOOKUP_ONLYCONVERTING; tree name; if (init && TREE_CODE (init) == TREE_LIST && TREE_VALUE (init) == error_mark_node && TREE_CHAIN (init) == NULL_TREE) init = NULL_TREE; value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist); if (! value || error_operand_p (value)) /* friend or constructor went bad. */ return error_mark_node; if (TREE_CODE (value) == TYPE_DECL && init) { error ("typedef %qD is initialized (use decltype instead)", value); init = NULL_TREE; } /* Pass friendly classes back. */ if (value == void_type_node) return value; /* Pass friend decls back. */ if ((TREE_CODE (value) == FUNCTION_DECL || TREE_CODE (value) == TEMPLATE_DECL) && DECL_CONTEXT (value) != current_class_type) return value; name = DECL_NAME (value); if (name != NULL_TREE) { if (TREE_CODE (name) == TEMPLATE_ID_EXPR) { error ("explicit template argument list not allowed"); return error_mark_node; } if (IDENTIFIER_POINTER (name)[0] == '_' && ! strcmp (IDENTIFIER_POINTER (name), "_vptr")) error ("member %qD conflicts with virtual function table field name", value); } /* Stash away type declarations. */ if (TREE_CODE (value) == TYPE_DECL) { DECL_NONLOCAL (value) = 1; DECL_CONTEXT (value) = current_class_type; if (processing_template_decl) value = push_template_decl (value); if (attrlist) { int attrflags = 0; /* If this is a typedef that names the class for linkage purposes (7.1.3p8), apply any attributes directly to the type. */ if (TAGGED_TYPE_P (TREE_TYPE (value)) && value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value)))) attrflags = ATTR_FLAG_TYPE_IN_PLACE; cplus_decl_attributes (&value, attrlist, attrflags); } if (declspecs->specs[(int)ds_typedef] && TREE_TYPE (value) != error_mark_node && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value) cp_set_underlying_type (value); return value; } if (DECL_IN_AGGR_P (value)) { error ("%qD is already defined in %qT", value, DECL_CONTEXT (value)); return void_type_node; } if (asmspec_tree && asmspec_tree != error_mark_node) asmspec = TREE_STRING_POINTER (asmspec_tree); if (init) { if (TREE_CODE (value) == FUNCTION_DECL) { /* Initializers for functions are rejected early in the parser. If we get here, it must be a pure specifier for a method. */ if (init == ridpointers[(int)RID_DELETE]) { DECL_DELETED_FN (value) = 1; DECL_DECLARED_INLINE_P (value) = 1; DECL_INITIAL (value) = error_mark_node; } else if (init == ridpointers[(int)RID_DEFAULT]) { if (defaultable_fn_check (value)) { DECL_DEFAULTED_FN (value) = 1; DECL_INITIALIZED_IN_CLASS_P (value) = 1; DECL_DECLARED_INLINE_P (value) = 1; } } else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE) { if (integer_zerop (init)) DECL_PURE_VIRTUAL_P (value) = 1; else if (error_operand_p (init)) ; /* An error has already been reported. */ else error ("invalid initializer for member function %qD", value); } else { gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE); error ("initializer specified for static member function %qD", value); } } else if (pedantic && TREE_CODE (value) != VAR_DECL) /* Already complained in grokdeclarator. */ init = NULL_TREE; else if (!processing_template_decl) { if (TREE_CODE (init) == CONSTRUCTOR) init = digest_init (TREE_TYPE (value), init); else init = integral_constant_value (init); if (init != error_mark_node && !TREE_CONSTANT (init)) { /* We can allow references to things that are effectively static, since references are initialized with the address. */ if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE || (TREE_STATIC (init) == 0 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0))) { error ("field initializer is not constant"); init = error_mark_node; } } } } if (processing_template_decl && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL)) { value = push_template_decl (value); if (error_operand_p (value)) return error_mark_node; } if (attrlist) cplus_decl_attributes (&value, attrlist, 0); switch (TREE_CODE (value)) { case VAR_DECL: finish_static_data_member_decl (value, init, init_const_expr_p, asmspec_tree, flags); return value; case FIELD_DECL: if (asmspec) error ("%<asm%> specifiers are not permitted on non-static data members"); if (DECL_INITIAL (value) == error_mark_node) init = error_mark_node; cp_finish_decl (value, init, /*init_const_expr_p=*/false, NULL_TREE, flags); DECL_INITIAL (value) = init; DECL_IN_AGGR_P (value) = 1; return value; case FUNCTION_DECL: if (asmspec) set_user_assembler_name (value, asmspec); cp_finish_decl (value, /*init=*/NULL_TREE, /*init_const_expr_p=*/false, asmspec_tree, flags); /* Pass friends back this way. */ if (DECL_FRIEND_P (value)) return void_type_node; DECL_IN_AGGR_P (value) = 1; return value; default: gcc_unreachable (); } return NULL_TREE; } /* Like `grokfield', but for bitfields. WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */ tree grokbitfield (const cp_declarator *declarator, cp_decl_specifier_seq *declspecs, tree width, tree attrlist) { tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, &attrlist); if (value == error_mark_node) return NULL_TREE; /* friends went bad. */ /* Pass friendly classes back. */ if (TREE_CODE (value) == VOID_TYPE) return void_type_node; if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value)) && (POINTER_TYPE_P (value) || !dependent_type_p (TREE_TYPE (value)))) { error ("bit-field %qD with non-integral type", value); return error_mark_node; } if (TREE_CODE (value) == TYPE_DECL) { error ("cannot declare %qD to be a bit-field type", value); return NULL_TREE; } /* Usually, finish_struct_1 catches bitfields with invalid types. But, in the case of bitfields with function type, we confuse ourselves into thinking they are member functions, so we must check here. */ if (TREE_CODE (value) == FUNCTION_DECL) { error ("cannot declare bit-field %qD with function type", DECL_NAME (value)); return NULL_TREE; } if (DECL_IN_AGGR_P (value)) { error ("%qD is already defined in the class %qT", value, DECL_CONTEXT (value)); return void_type_node; } if (TREE_STATIC (value)) { error ("static member %qD cannot be a bit-field", value); return NULL_TREE; } cp_finish_decl (value, NULL_TREE, false, NULL_TREE, 0); if (width != error_mark_node) { constant_expression_warning (width); DECL_INITIAL (value) = width; SET_DECL_C_BIT_FIELD (value); } DECL_IN_AGGR_P (value) = 1; if (attrlist) cplus_decl_attributes (&value, attrlist, /*flags=*/0); return value; } /* Returns true iff ATTR is an attribute which needs to be applied at instantiation time rather than template definition time. */ static bool is_late_template_attribute (tree attr, tree decl) { tree name = TREE_PURPOSE (attr); tree args = TREE_VALUE (attr); const struct attribute_spec *spec = lookup_attribute_spec (name); tree arg; if (!spec) /* Unknown attribute. */ return false; /* Attribute weak handling wants to write out assembly right away. */ if (is_attribute_p ("weak", name)) return true; /* If any of the arguments are dependent expressions, we can't evaluate the attribute until instantiation time. */ for (arg = args; arg; arg = TREE_CHAIN (arg)) { tree t = TREE_VALUE (arg); /* If the first attribute argument is an identifier, only consider second and following arguments. Attributes like mode, format, cleanup and several target specific attributes aren't late just because they have an IDENTIFIER_NODE as first argument. */ if (arg == args && TREE_CODE (t) == IDENTIFIER_NODE) continue; if (value_dependent_expression_p (t) || type_dependent_expression_p (t)) return true; } if (TREE_CODE (decl) == TYPE_DECL || TYPE_P (decl) || spec->type_required) { tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl); /* We can't apply any attributes to a completely unknown type until instantiation time. */ enum tree_code code = TREE_CODE (type); if (code == TEMPLATE_TYPE_PARM || code == BOUND_TEMPLATE_TEMPLATE_PARM || code == TYPENAME_TYPE) return true; /* Also defer most attributes on dependent types. This is not necessary in all cases, but is the better default. */ else if (dependent_type_p (type) /* But attribute visibility specifically works on templates. */ && !is_attribute_p ("visibility", name)) return true; else return false; } else return false; } /* ATTR_P is a list of attributes. Remove any attributes which need to be applied at instantiation time and return them. If IS_DEPENDENT is true, the declaration itself is dependent, so all attributes should be applied at instantiation time. */ static tree splice_template_attributes (tree *attr_p, tree decl) { tree *p = attr_p; tree late_attrs = NULL_TREE; tree *q = &late_attrs; if (!p) return NULL_TREE; for (; *p; ) { if (is_late_template_attribute (*p, decl)) { ATTR_IS_DEPENDENT (*p) = 1; *q = *p; *p = TREE_CHAIN (*p); q = &TREE_CHAIN (*q); *q = NULL_TREE; } else p = &TREE_CHAIN (*p); } return late_attrs; } /* Remove any late attributes from the list in ATTR_P and attach them to DECL_P. */ static void save_template_attributes (tree *attr_p, tree *decl_p) { tree late_attrs = splice_template_attributes (attr_p, *decl_p); tree *q; tree old_attrs = NULL_TREE; if (!late_attrs) return; if (DECL_P (*decl_p)) q = &DECL_ATTRIBUTES (*decl_p); else q = &TYPE_ATTRIBUTES (*decl_p); old_attrs = *q; /* Place the late attributes at the beginning of the attribute list. */ TREE_CHAIN (tree_last (late_attrs)) = *q; *q = late_attrs; if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p)) { /* We've added new attributes directly to the main variant, so now we need to update all of the other variants to include these new attributes. */ tree variant; for (variant = TYPE_NEXT_VARIANT (*decl_p); variant; variant = TYPE_NEXT_VARIANT (variant)) { gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs); TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p); } } } /* Like reconstruct_complex_type, but handle also template trees. */ tree cp_reconstruct_complex_type (tree type, tree bottom) { tree inner, outer; if (TREE_CODE (type) == POINTER_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); outer = build_pointer_type_for_mode (inner, TYPE_MODE (type), TYPE_REF_CAN_ALIAS_ALL (type)); } else if (TREE_CODE (type) == REFERENCE_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); outer = build_reference_type_for_mode (inner, TYPE_MODE (type), TYPE_REF_CAN_ALIAS_ALL (type)); } else if (TREE_CODE (type) == ARRAY_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); outer = build_cplus_array_type (inner, TYPE_DOMAIN (type)); /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the element type qualification will be handled by the recursive cp_reconstruct_complex_type call and cp_build_qualified_type for ARRAY_TYPEs changes the element type. */ return outer; } else if (TREE_CODE (type) == FUNCTION_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); outer = build_function_type (inner, TYPE_ARG_TYPES (type)); } else if (TREE_CODE (type) == METHOD_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); /* The build_method_type_directly() routine prepends 'this' to argument list, so we must compensate by getting rid of it. */ outer = build_method_type_directly (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))), inner, TREE_CHAIN (TYPE_ARG_TYPES (type))); } else if (TREE_CODE (type) == OFFSET_TYPE) { inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom); outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner); } else return bottom; if (TYPE_ATTRIBUTES (type)) outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type)); return cp_build_qualified_type (outer, TYPE_QUALS (type)); } /* Like decl_attributes, but handle C++ complexity. */ void cplus_decl_attributes (tree *decl, tree attributes, int flags) { if (*decl == NULL_TREE || *decl == void_type_node || *decl == error_mark_node || attributes == NULL_TREE) return; if (processing_template_decl) { if (check_for_bare_parameter_packs (attributes)) return; save_template_attributes (&attributes, decl); if (attributes == NULL_TREE) return; } if (TREE_CODE (*decl) == TEMPLATE_DECL) decl = &DECL_TEMPLATE_RESULT (*decl); decl_attributes (decl, attributes, flags); if (TREE_CODE (*decl) == TYPE_DECL) SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl)); } /* Walks through the namespace- or function-scope anonymous union OBJECT, with the indicated TYPE, building appropriate VAR_DECLs. Returns one of the fields for use in the mangled name. */ static tree build_anon_union_vars (tree type, tree object) { tree main_decl = NULL_TREE; tree field; /* Rather than write the code to handle the non-union case, just give an error. */ if (TREE_CODE (type) != UNION_TYPE) error ("anonymous struct not inside named type"); for (field = TYPE_FIELDS (type); field != NULL_TREE; field = TREE_CHAIN (field)) { tree decl; tree ref; if (DECL_ARTIFICIAL (field)) continue; if (TREE_CODE (field) != FIELD_DECL) { permerror (input_location, "%q+#D invalid; an anonymous union can only " "have non-static data members", field); continue; } if (TREE_PRIVATE (field)) permerror (input_location, "private member %q+#D in anonymous union", field); else if (TREE_PROTECTED (field)) permerror (input_location, "protected member %q+#D in anonymous union", field); if (processing_template_decl) ref = build_min_nt (COMPONENT_REF, object, DECL_NAME (field), NULL_TREE); else ref = build_class_member_access_expr (object, field, NULL_TREE, false, tf_warning_or_error); if (DECL_NAME (field)) { tree base; decl = build_decl (input_location, VAR_DECL, DECL_NAME (field), TREE_TYPE (field)); DECL_ANON_UNION_VAR_P (decl) = 1; DECL_ARTIFICIAL (decl) = 1; base = get_base_address (object); TREE_PUBLIC (decl) = TREE_PUBLIC (base); TREE_STATIC (decl) = TREE_STATIC (base); DECL_EXTERNAL (decl) = DECL_EXTERNAL (base); SET_DECL_VALUE_EXPR (decl, ref); DECL_HAS_VALUE_EXPR_P (decl) = 1; decl = pushdecl (decl); } else if (ANON_AGGR_TYPE_P (TREE_TYPE (field))) decl = build_anon_union_vars (TREE_TYPE (field), ref); else decl = 0; if (main_decl == NULL_TREE) main_decl = decl; } return main_decl; } /* Finish off the processing of a UNION_TYPE structure. If the union is an anonymous union, then all members must be laid out together. PUBLIC_P is nonzero if this union is not declared static. */ void finish_anon_union (tree anon_union_decl) { tree type; tree main_decl; bool public_p; if (anon_union_decl == error_mark_node) return; type = TREE_TYPE (anon_union_decl); public_p = TREE_PUBLIC (anon_union_decl); /* The VAR_DECL's context is the same as the TYPE's context. */ DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type)); if (TYPE_FIELDS (type) == NULL_TREE) return; if (public_p) { error ("namespace-scope anonymous aggregates must be static"); return; } main_decl = build_anon_union_vars (type, anon_union_decl); if (main_decl == error_mark_node) return; if (main_decl == NULL_TREE) { warning (0, "anonymous union with no members"); return; } if (!processing_template_decl) { /* Use main_decl to set the mangled name. */ DECL_NAME (anon_union_decl) = DECL_NAME (main_decl); maybe_commonize_var (anon_union_decl); mangle_decl (anon_union_decl); DECL_NAME (anon_union_decl) = NULL_TREE; } pushdecl (anon_union_decl); if (building_stmt_tree () && at_function_scope_p ()) add_decl_expr (anon_union_decl); else if (!processing_template_decl) rest_of_decl_compilation (anon_union_decl, toplevel_bindings_p (), at_eof); } /* Auxiliary functions to make type signatures for `operator new' and `operator delete' correspond to what compiler will be expecting. */ tree coerce_new_type (tree type) { int e = 0; tree args = TYPE_ARG_TYPES (type); gcc_assert (TREE_CODE (type) == FUNCTION_TYPE); if (!same_type_p (TREE_TYPE (type), ptr_type_node)) { e = 1; error ("%<operator new%> must return type %qT", ptr_type_node); } if (args && args != void_list_node) { if (TREE_PURPOSE (args)) { /* [basic.stc.dynamic.allocation] The first parameter shall not have an associated default argument. */ error ("the first parameter of %<operator new%> cannot " "have a default argument"); /* Throw away the default argument. */ TREE_PURPOSE (args) = NULL_TREE; } if (!same_type_p (TREE_VALUE (args), size_type_node)) { e = 2; args = TREE_CHAIN (args); } } else e = 2; if (e == 2) permerror (input_location, "%<operator new%> takes type %<size_t%> (%qT) " "as first parameter", size_type_node); switch (e) { case 2: args = tree_cons (NULL_TREE, size_type_node, args); /* Fall through. */ case 1: type = build_exception_variant (build_function_type (ptr_type_node, args), TYPE_RAISES_EXCEPTIONS (type)); /* Fall through. */ default:; } return type; } tree coerce_delete_type (tree type) { int e = 0; tree args = TYPE_ARG_TYPES (type); gcc_assert (TREE_CODE (type) == FUNCTION_TYPE); if (!same_type_p (TREE_TYPE (type), void_type_node)) { e = 1; error ("%<operator delete%> must return type %qT", void_type_node); } if (!args || args == void_list_node || !same_type_p (TREE_VALUE (args), ptr_type_node)) { e = 2; if (args && args != void_list_node) args = TREE_CHAIN (args); error ("%<operator delete%> takes type %qT as first parameter", ptr_type_node); } switch (e) { case 2: args = tree_cons (NULL_TREE, ptr_type_node, args); /* Fall through. */ case 1: type = build_exception_variant (build_function_type (void_type_node, args), TYPE_RAISES_EXCEPTIONS (type)); /* Fall through. */ default:; } return type; } /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable and mark them as needed. */ static void mark_vtable_entries (tree decl) { tree fnaddr; unsigned HOST_WIDE_INT idx; FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)), idx, fnaddr) { tree fn; STRIP_NOPS (fnaddr); if (TREE_CODE (fnaddr) != ADDR_EXPR && TREE_CODE (fnaddr) != FDESC_EXPR) /* This entry is an offset: a virtual base class offset, a virtual call offset, an RTTI offset, etc. */ continue; fn = TREE_OPERAND (fnaddr, 0); TREE_ADDRESSABLE (fn) = 1; /* When we don't have vcall offsets, we output thunks whenever we output the vtables that contain them. With vcall offsets, we know all the thunks we'll need when we emit a virtual function, so we emit the thunks there instead. */ if (DECL_THUNK_P (fn)) use_thunk (fn, /*emit_p=*/0); mark_used (fn); } } /* Set DECL up to have the closest approximation of "initialized common" linkage available. */ void comdat_linkage (tree decl) { if (flag_weak) make_decl_one_only (decl, cxx_comdat_group (decl)); else if (TREE_CODE (decl) == FUNCTION_DECL || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl))) /* We can just emit function and compiler-generated variables statically; having multiple copies is (for the most part) only a waste of space. There are two correctness issues, however: the address of a template instantiation with external linkage should be the same, independent of what translation unit asks for the address, and this will not hold when we emit multiple copies of the function. However, there's little else we can do. Also, by default, the typeinfo implementation assumes that there will be only one copy of the string used as the name for each type. Therefore, if weak symbols are unavailable, the run-time library should perform a more conservative check; it should perform a string comparison, rather than an address comparison. */ TREE_PUBLIC (decl) = 0; else { /* Static data member template instantiations, however, cannot have multiple copies. */ if (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node) DECL_COMMON (decl) = 1; else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl))) { DECL_COMMON (decl) = 1; DECL_INITIAL (decl) = error_mark_node; } else if (!DECL_EXPLICIT_INSTANTIATION (decl)) { /* We can't do anything useful; leave vars for explicit instantiation. */ DECL_EXTERNAL (decl) = 1; DECL_NOT_REALLY_EXTERN (decl) = 0; } } DECL_COMDAT (decl) = 1; } /* For win32 we also want to put explicit instantiations in linkonce sections, so that they will be merged with implicit instantiations; otherwise we get duplicate symbol errors. For Darwin we do not want explicit instantiations to be linkonce. */ void maybe_make_one_only (tree decl) { /* We used to say that this was not necessary on targets that support weak symbols, because the implicit instantiations will defer to the explicit one. However, that's not actually the case in SVR4; a strong definition after a weak one is an error. Also, not making explicit instantiations one_only means that we can end up with two copies of some template instantiations. */ if (! flag_weak) return; /* We can't set DECL_COMDAT on functions, or cp_finish_file will think we can get away with not emitting them if they aren't used. We need to for variables so that cp_finish_decl will update their linkage, because their DECL_INITIAL may not have been set properly yet. */ if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC || (! DECL_EXPLICIT_INSTANTIATION (decl) && ! DECL_TEMPLATE_SPECIALIZATION (decl))) { make_decl_one_only (decl, cxx_comdat_group (decl)); if (TREE_CODE (decl) == VAR_DECL) { DECL_COMDAT (decl) = 1; /* Mark it needed so we don't forget to emit it. */ mark_decl_referenced (decl); } } } /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage. This predicate will give the right answer during parsing of the function, which other tests may not. */ bool vague_linkage_p (tree decl) { /* Unfortunately, import_export_decl has not always been called before the function is processed, so we cannot simply check DECL_COMDAT. */ return (DECL_COMDAT (decl) || (((TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)) || (DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INSTANTIATION (decl))) && TREE_PUBLIC (decl))); } /* Determine whether or not we want to specifically import or export CTYPE, using various heuristics. */ static void import_export_class (tree ctype) { /* -1 for imported, 1 for exported. */ int import_export = 0; /* It only makes sense to call this function at EOF. The reason is that this function looks at whether or not the first non-inline non-abstract virtual member function has been defined in this translation unit. But, we can't possibly know that until we've seen the entire translation unit. */ gcc_assert (at_eof); if (CLASSTYPE_INTERFACE_KNOWN (ctype)) return; /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface, we will have CLASSTYPE_INTERFACE_ONLY set but not CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this heuristic because someone will supply a #pragma implementation elsewhere, and deducing it here would produce a conflict. */ if (CLASSTYPE_INTERFACE_ONLY (ctype)) return; if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype))) import_export = -1; else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype))) import_export = 1; else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype) && !flag_implicit_templates) /* For a template class, without -fimplicit-templates, check the repository. If the virtual table is assigned to this translation unit, then export the class; otherwise, import it. */ import_export = repo_export_class_p (ctype) ? 1 : -1; else if (TYPE_POLYMORPHIC_P (ctype)) { /* The ABI specifies that the virtual table and associated information are emitted with the key method, if any. */ tree method = CLASSTYPE_KEY_METHOD (ctype); /* If weak symbol support is not available, then we must be careful not to emit the vtable when the key function is inline. An inline function can be defined in multiple translation units. If we were to emit the vtable in each translation unit containing a definition, we would get multiple definition errors at link-time. */ if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method))) import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1); } /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing a definition anywhere else. */ if (MULTIPLE_SYMBOL_SPACES && import_export == -1) import_export = 0; /* Allow back ends the chance to overrule the decision. */ if (targetm.cxx.import_export_class) import_export = targetm.cxx.import_export_class (ctype, import_export); if (import_export) { SET_CLASSTYPE_INTERFACE_KNOWN (ctype); CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0); } } /* Return true if VAR has already been provided to the back end; in that case VAR should not be modified further by the front end. */ static bool var_finalized_p (tree var) { return varpool_node (var)->finalized; } /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason, must be emitted in this translation unit. Mark it as such. */ void mark_needed (tree decl) { /* It's possible that we no longer need to set TREE_SYMBOL_REFERENCED here directly, but doing so is harmless. */ TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1; mark_decl_referenced (decl); } /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function returns true if a definition of this entity should be provided in this object file. Callers use this function to determine whether or not to let the back end know that a definition of DECL is available in this translation unit. */ bool decl_needed_p (tree decl) { gcc_assert (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL); /* This function should only be called at the end of the translation unit. We cannot be sure of whether or not something will be COMDAT until that point. */ gcc_assert (at_eof); /* All entities with external linkage that are not COMDAT should be emitted; they may be referred to from other object files. */ if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) return true; /* If this entity was used, let the back end see it; it will decide whether or not to emit it into the object file. */ if (TREE_USED (decl) || (DECL_ASSEMBLER_NAME_SET_P (decl) && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) return true; /* Functions marked "dllexport" must be emitted so that they are visible to other DLLs. */ if (lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) return true; /* Otherwise, DECL does not need to be emitted -- yet. A subsequent reference to DECL might cause it to be emitted later. */ return false; } /* If necessary, write out the vtables for the dynamic class CTYPE. Returns true if any vtables were emitted. */ static bool maybe_emit_vtables (tree ctype) { tree vtbl; tree primary_vtbl; int needed = 0; /* If the vtables for this class have already been emitted there is nothing more to do. */ primary_vtbl = CLASSTYPE_VTABLES (ctype); if (var_finalized_p (primary_vtbl)) return false; /* Ignore dummy vtables made by get_vtable_decl. */ if (TREE_TYPE (primary_vtbl) == void_type_node) return false; /* On some targets, we cannot determine the key method until the end of the translation unit -- which is when this function is called. */ if (!targetm.cxx.key_method_may_be_inline ()) determine_key_method (ctype); /* See if any of the vtables are needed. */ for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl)) { import_export_decl (vtbl); if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl)) needed = 1; } if (!needed) { /* If the references to this class' vtables are optimized away, still emit the appropriate debugging information. See dfs_debug_mark. */ if (DECL_COMDAT (primary_vtbl) && CLASSTYPE_DEBUG_REQUESTED (ctype)) note_debug_info_needed (ctype); return false; } /* The ABI requires that we emit all of the vtables if we emit any of them. */ for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl)) { /* Mark entities references from the virtual table as used. */ mark_vtable_entries (vtbl); if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0) { tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), LOOKUP_NORMAL); /* It had better be all done at compile-time. */ gcc_assert (!expr); } /* Write it out. */ DECL_EXTERNAL (vtbl) = 0; rest_of_decl_compilation (vtbl, 1, 1); /* Because we're only doing syntax-checking, we'll never end up actually marking the variable as written. */ if (flag_syntax_only) TREE_ASM_WRITTEN (vtbl) = 1; } /* Since we're writing out the vtable here, also write the debug info. */ note_debug_info_needed (ctype); return true; } /* A special return value from type_visibility meaning internal linkage. */ enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 }; /* walk_tree helper function for type_visibility. */ static tree min_vis_r (tree *tp, int *walk_subtrees, void *data) { int *vis_p = (int *)data; if (! TYPE_P (*tp)) { *walk_subtrees = 0; } else if (CLASS_TYPE_P (*tp)) { if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp))) { *vis_p = VISIBILITY_ANON; return *tp; } else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p) *vis_p = CLASSTYPE_VISIBILITY (*tp); } return NULL; } /* Returns the visibility of TYPE, which is the minimum visibility of its component types. */ static int type_visibility (tree type) { int vis = VISIBILITY_DEFAULT; cp_walk_tree_without_duplicates (&type, min_vis_r, &vis); return vis; } /* Limit the visibility of DECL to VISIBILITY, if not explicitly specified (or if VISIBILITY is static). */ static bool constrain_visibility (tree decl, int visibility) { if (visibility == VISIBILITY_ANON) { /* extern "C" declarations aren't affected by the anonymous namespace. */ if (!DECL_EXTERN_C_P (decl)) { TREE_PUBLIC (decl) = 0; DECL_WEAK (decl) = 0; DECL_COMMON (decl) = 0; DECL_COMDAT_GROUP (decl) = NULL_TREE; DECL_INTERFACE_KNOWN (decl) = 1; if (DECL_LANG_SPECIFIC (decl)) DECL_NOT_REALLY_EXTERN (decl) = 1; } } else if (visibility > DECL_VISIBILITY (decl) && !DECL_VISIBILITY_SPECIFIED (decl)) { DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility; return true; } return false; } /* Constrain the visibility of DECL based on the visibility of its template arguments. */ static void constrain_visibility_for_template (tree decl, tree targs) { /* If this is a template instantiation, check the innermost template args for visibility constraints. The outer template args are covered by the class check. */ tree args = INNERMOST_TEMPLATE_ARGS (targs); int i; for (i = TREE_VEC_LENGTH (args); i > 0; --i) { int vis = 0; tree arg = TREE_VEC_ELT (args, i-1); if (TYPE_P (arg)) vis = type_visibility (arg); else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg))) { STRIP_NOPS (arg); if (TREE_CODE (arg) == ADDR_EXPR) arg = TREE_OPERAND (arg, 0); if (TREE_CODE (arg) == VAR_DECL || TREE_CODE (arg) == FUNCTION_DECL) { if (! TREE_PUBLIC (arg)) vis = VISIBILITY_ANON; else vis = DECL_VISIBILITY (arg); } } if (vis) constrain_visibility (decl, vis); } } /* Like c_determine_visibility, but with additional C++-specific behavior. Function-scope entities can rely on the function's visibility because it is set in start_preparsed_function. Class-scope entities cannot rely on the class's visibility until the end of the enclosing class definition. Note that because namespaces have multiple independent definitions, namespace visibility is handled elsewhere using the #pragma visibility machinery rather than by decorating the namespace declaration. The goal is for constraints from the type to give a diagnostic, and other constraints to be applied silently. */ void determine_visibility (tree decl) { tree class_type = NULL_TREE; bool use_template; bool orig_visibility_specified; enum symbol_visibility orig_visibility; /* Remember that all decls get VISIBILITY_DEFAULT when built. */ /* Only relevant for names with external linkage. */ if (!TREE_PUBLIC (decl)) return; /* Cloned constructors and destructors get the same visibility as the underlying function. That should be set up in maybe_clone_body. */ gcc_assert (!DECL_CLONED_FUNCTION_P (decl)); orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl); orig_visibility = DECL_VISIBILITY (decl); if (TREE_CODE (decl) == TYPE_DECL) { if (CLASS_TYPE_P (TREE_TYPE (decl))) use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl)); else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl))) use_template = 1; else use_template = 0; } else if (DECL_LANG_SPECIFIC (decl)) use_template = DECL_USE_TEMPLATE (decl); else use_template = 0; /* If DECL is a member of a class, visibility specifiers on the class can influence the visibility of the DECL. */ if (DECL_CLASS_SCOPE_P (decl)) class_type = DECL_CONTEXT (decl); else { /* Not a class member. */ /* Virtual tables have DECL_CONTEXT set to their associated class, so they are automatically handled above. */ gcc_assert (TREE_CODE (decl) != VAR_DECL || !DECL_VTABLE_OR_VTT_P (decl)); if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl)) { /* Local statics and classes get the visibility of their containing function by default, except that -fvisibility-inlines-hidden doesn't affect them. */ tree fn = DECL_CONTEXT (decl); if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn)) { DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn); DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (fn); } else determine_visibility_from_class (decl, DECL_CONTEXT (fn)); /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set, but have no TEMPLATE_INFO, so don't try to check it. */ use_template = 0; } else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl) && flag_visibility_ms_compat) { /* Under -fvisibility-ms-compat, types are visible by default, even though their contents aren't. */ tree underlying_type = TREE_TYPE (DECL_NAME (decl)); int underlying_vis = type_visibility (underlying_type); if (underlying_vis == VISIBILITY_ANON || CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)) constrain_visibility (decl, underlying_vis); else DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; } else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)) { /* tinfo visibility is based on the type it's for. */ constrain_visibility (decl, type_visibility (TREE_TYPE (DECL_NAME (decl)))); /* Give the target a chance to override the visibility associated with DECL. */ if (TREE_PUBLIC (decl) && !DECL_REALLY_EXTERN (decl) && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))) && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl)))) targetm.cxx.determine_class_data_visibility (decl); } else if (use_template) /* Template instantiations and specializations get visibility based on their template unless they override it with an attribute. */; else if (! DECL_VISIBILITY_SPECIFIED (decl)) { /* Set default visibility to whatever the user supplied with #pragma GCC visibility or a namespace visibility attribute. */ DECL_VISIBILITY (decl) = default_visibility; DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; } } if (use_template) { /* If the specialization doesn't specify visibility, use the visibility from the template. */ tree tinfo = (TREE_CODE (decl) == TYPE_DECL ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl)) : DECL_TEMPLATE_INFO (decl)); tree args = TI_ARGS (tinfo); if (args != error_mark_node) { int depth = TMPL_ARGS_DEPTH (args); tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo)); if (!DECL_VISIBILITY_SPECIFIED (decl)) { DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern); DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (pattern); } /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */ if (args && depth > template_class_depth (class_type)) /* Limit visibility based on its template arguments. */ constrain_visibility_for_template (decl, args); } } if (class_type) determine_visibility_from_class (decl, class_type); if (decl_anon_ns_mem_p (decl)) /* Names in an anonymous namespace get internal linkage. This might change once we implement export. */ constrain_visibility (decl, VISIBILITY_ANON); else if (TREE_CODE (decl) != TYPE_DECL) { /* Propagate anonymity from type to decl. */ int tvis = type_visibility (TREE_TYPE (decl)); if (tvis == VISIBILITY_ANON || ! DECL_VISIBILITY_SPECIFIED (decl)) constrain_visibility (decl, tvis); } else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true)) /* DR 757: A type without linkage shall not be used as the type of a variable or function with linkage, unless o the variable or function has extern "C" linkage (7.5 [dcl.link]), or o the variable or function is not used (3.2 [basic.def.odr]) or is defined in the same translation unit. Since non-extern "C" decls need to be defined in the same translation unit, we can make the type internal. */ constrain_visibility (decl, VISIBILITY_ANON); /* If visibility changed and DECL already has DECL_RTL, ensure symbol flags are updated. */ if ((DECL_VISIBILITY (decl) != orig_visibility || DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified) && ((TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) || TREE_CODE (decl) == FUNCTION_DECL) && DECL_RTL_SET_P (decl)) make_decl_rtl (decl); } /* By default, static data members and function members receive the visibility of their containing class. */ static void determine_visibility_from_class (tree decl, tree class_type) { if (DECL_VISIBILITY_SPECIFIED (decl)) return; if (visibility_options.inlines_hidden /* Don't do this for inline templates; specializations might not be inline, and we don't want them to inherit the hidden visibility. We'll set it here for all inline instantiations. */ && !processing_template_decl && TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl) && (! DECL_LANG_SPECIFIC (decl) || ! DECL_EXPLICIT_INSTANTIATION (decl))) DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN; else { /* Default to the class visibility. */ DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type); DECL_VISIBILITY_SPECIFIED (decl) = CLASSTYPE_VISIBILITY_SPECIFIED (class_type); } /* Give the target a chance to override the visibility associated with DECL. */ if (TREE_CODE (decl) == VAR_DECL && (DECL_TINFO_P (decl) || (DECL_VTABLE_OR_VTT_P (decl) /* Construction virtual tables are not exported because they cannot be referred to from other object files; their name is not standardized by the ABI. */ && !DECL_CONSTRUCTION_VTABLE_P (decl))) && TREE_PUBLIC (decl) && !DECL_REALLY_EXTERN (decl) && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type)) targetm.cxx.determine_class_data_visibility (decl); } /* Constrain the visibility of a class TYPE based on the visibility of its field types. Warn if any fields require lesser visibility. */ void constrain_class_visibility (tree type) { tree binfo; tree t; int i; int vis = type_visibility (type); if (vis == VISIBILITY_ANON || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type))) return; /* Don't warn about visibility if the class has explicit visibility. */ if (CLASSTYPE_VISIBILITY_SPECIFIED (type)) vis = VISIBILITY_INTERNAL; for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t)) if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node) { tree ftype = strip_pointer_or_array_types (TREE_TYPE (t)); int subvis = type_visibility (ftype); if (subvis == VISIBILITY_ANON) { if (!in_main_input_context ()) warning (0, "\ %qT has a field %qD whose type uses the anonymous namespace", type, t); } else if (MAYBE_CLASS_TYPE_P (ftype) && vis < VISIBILITY_HIDDEN && subvis >= VISIBILITY_HIDDEN) warning (OPT_Wattributes, "\ %qT declared with greater visibility than the type of its field %qD", type, t); } binfo = TYPE_BINFO (type); for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i) { int subvis = type_visibility (TREE_TYPE (t)); if (subvis == VISIBILITY_ANON) { if (!in_main_input_context()) warning (0, "\ %qT has a base %qT whose type uses the anonymous namespace", type, TREE_TYPE (t)); } else if (vis < VISIBILITY_HIDDEN && subvis >= VISIBILITY_HIDDEN) warning (OPT_Wattributes, "\ %qT declared with greater visibility than its base %qT", type, TREE_TYPE (t)); } } /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage for DECL has not already been determined, do so now by setting DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this function is called entities with vague linkage whose definitions are available must have TREE_PUBLIC set. If this function decides to place DECL in COMDAT, it will set appropriate flags -- but will not clear DECL_EXTERNAL. It is up to the caller to decide whether or not to clear DECL_EXTERNAL. Some callers defer that decision until it is clear that DECL is actually required. */ void import_export_decl (tree decl) { int emit_p; bool comdat_p; bool import_p; tree class_type = NULL_TREE; if (DECL_INTERFACE_KNOWN (decl)) return; /* We cannot determine what linkage to give to an entity with vague linkage until the end of the file. For example, a virtual table for a class will be defined if and only if the key method is defined in this translation unit. As a further example, consider that when compiling a translation unit that uses PCH file with "-frepo" it would be incorrect to make decisions about what entities to emit when building the PCH; those decisions must be delayed until the repository information has been processed. */ gcc_assert (at_eof); /* Object file linkage for explicit instantiations is handled in mark_decl_instantiated. For static variables in functions with vague linkage, maybe_commonize_var is used. Therefore, the only declarations that should be provided to this function are those with external linkage that are: * implicit instantiations of function templates * inline function * implicit instantiations of static data members of class templates * virtual tables * typeinfo objects Furthermore, all entities that reach this point must have a definition available in this translation unit. The following assertions check these conditions. */ gcc_assert (TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL); /* Any code that creates entities with TREE_PUBLIC cleared should also set DECL_INTERFACE_KNOWN. */ gcc_assert (TREE_PUBLIC (decl)); if (TREE_CODE (decl) == FUNCTION_DECL) gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl) || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl) || DECL_DECLARED_INLINE_P (decl)); else gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl) || DECL_VTABLE_OR_VTT_P (decl) || DECL_TINFO_P (decl)); /* Check that a definition of DECL is available in this translation unit. */ gcc_assert (!DECL_REALLY_EXTERN (decl)); /* Assume that DECL will not have COMDAT linkage. */ comdat_p = false; /* Assume that DECL will not be imported into this translation unit. */ import_p = false; /* See if the repository tells us whether or not to emit DECL in this translation unit. */ emit_p = repo_emit_p (decl); if (emit_p == 0) import_p = true; else if (emit_p == 1) { /* The repository indicates that this entity should be defined here. Make sure the back end honors that request. */ if (TREE_CODE (decl) == VAR_DECL) mark_needed (decl); else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) { tree clone; FOR_EACH_CLONE (clone, decl) mark_needed (clone); } else mark_needed (decl); /* Output the definition as an ordinary strong definition. */ DECL_EXTERNAL (decl) = 0; DECL_INTERFACE_KNOWN (decl) = 1; return; } if (import_p) /* We have already decided what to do with this DECL; there is no need to check anything further. */ ; else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl)) { class_type = DECL_CONTEXT (decl); import_export_class (class_type); if (TYPE_FOR_JAVA (class_type)) import_p = true; else if (CLASSTYPE_INTERFACE_KNOWN (class_type) && CLASSTYPE_INTERFACE_ONLY (class_type)) import_p = true; else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC) && !CLASSTYPE_USE_TEMPLATE (class_type) && CLASSTYPE_KEY_METHOD (class_type) && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))) /* The ABI requires that all virtual tables be emitted with COMDAT linkage. However, on systems where COMDAT symbols don't show up in the table of contents for a static archive, or on systems without weak symbols (where we approximate COMDAT linkage by using internal linkage), the linker will report errors about undefined symbols because it will not see the virtual table definition. Therefore, in the case that we know that the virtual table will be emitted in only one translation unit, we make the virtual table an ordinary definition with external linkage. */ DECL_EXTERNAL (decl) = 0; else if (CLASSTYPE_INTERFACE_KNOWN (class_type)) { /* CLASS_TYPE is being exported from this translation unit, so DECL should be defined here. */ if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type)) /* If a class is declared in a header with the "extern template" extension, then it will not be instantiated, even in translation units that would normally require it. Often such classes are explicitly instantiated in one translation unit. Therefore, the explicit instantiation must be made visible to other translation units. */ DECL_EXTERNAL (decl) = 0; else { /* The generic C++ ABI says that class data is always COMDAT, even if there is a key function. Some variants (e.g., the ARM EABI) says that class data only has COMDAT linkage if the class data might be emitted in more than one translation unit. When the key method can be inline and is inline, we still have to arrange for comdat even though class_data_always_comdat is false. */ if (!CLASSTYPE_KEY_METHOD (class_type) || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)) || targetm.cxx.class_data_always_comdat ()) { /* The ABI requires COMDAT linkage. Normally, we only emit COMDAT things when they are needed; make sure that we realize that this entity is indeed needed. */ comdat_p = true; mark_needed (decl); } } } else if (!flag_implicit_templates && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type)) import_p = true; else comdat_p = true; } else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl)) { tree type = TREE_TYPE (DECL_NAME (decl)); if (CLASS_TYPE_P (type)) { class_type = type; import_export_class (type); if (CLASSTYPE_INTERFACE_KNOWN (type) && TYPE_POLYMORPHIC_P (type) && CLASSTYPE_INTERFACE_ONLY (type) /* If -fno-rtti was specified, then we cannot be sure that RTTI information will be emitted with the virtual table of the class, so we must emit it wherever it is used. */ && flag_rtti) import_p = true; else { if (CLASSTYPE_INTERFACE_KNOWN (type) && !CLASSTYPE_INTERFACE_ONLY (type)) { comdat_p = (targetm.cxx.class_data_always_comdat () || (CLASSTYPE_KEY_METHOD (type) && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type)))); mark_needed (decl); if (!flag_weak) { comdat_p = false; DECL_EXTERNAL (decl) = 0; } } else comdat_p = true; } } else comdat_p = true; } else if (DECL_TEMPLATE_INSTANTIATION (decl) || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)) { /* DECL is an implicit instantiation of a function or static data member. */ if ((flag_implicit_templates && !flag_use_repository) || (flag_implicit_inline_templates && TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))) comdat_p = true; else /* If we are not implicitly generating templates, then mark this entity as undefined in this translation unit. */ import_p = true; } else if (DECL_FUNCTION_MEMBER_P (decl)) { if (!DECL_DECLARED_INLINE_P (decl)) { tree ctype = DECL_CONTEXT (decl); import_export_class (ctype); if (CLASSTYPE_INTERFACE_KNOWN (ctype)) { DECL_NOT_REALLY_EXTERN (decl) = ! (CLASSTYPE_INTERFACE_ONLY (ctype) || (DECL_DECLARED_INLINE_P (decl) && ! flag_implement_inlines && !DECL_VINDEX (decl))); if (!DECL_NOT_REALLY_EXTERN (decl)) DECL_EXTERNAL (decl) = 1; /* Always make artificials weak. */ if (DECL_ARTIFICIAL (decl) && flag_weak) comdat_p = true; else maybe_make_one_only (decl); } } else comdat_p = true; } else comdat_p = true; if (import_p) { /* If we are importing DECL into this translation unit, mark is an undefined here. */ DECL_EXTERNAL (decl) = 1; DECL_NOT_REALLY_EXTERN (decl) = 0; } else if (comdat_p) { /* If we decided to put DECL in COMDAT, mark it accordingly at this point. */ comdat_linkage (decl); } DECL_INTERFACE_KNOWN (decl) = 1; } /* Return an expression that performs the destruction of DECL, which must be a VAR_DECL whose type has a non-trivial destructor, or is an array whose (innermost) elements have a non-trivial destructor. */ tree build_cleanup (tree decl) { tree temp; tree type = TREE_TYPE (decl); /* This function should only be called for declarations that really require cleanups. */ gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type)); /* Treat all objects with destructors as used; the destructor may do something substantive. */ mark_used (decl); if (TREE_CODE (type) == ARRAY_TYPE) temp = decl; else temp = build_address (decl); temp = build_delete (TREE_TYPE (temp), temp, sfk_complete_destructor, LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0); return temp; } /* Returns the initialization guard variable for the variable DECL, which has static storage duration. */ tree get_guard (tree decl) { tree sname; tree guard; sname = mangle_guard_variable (decl); guard = IDENTIFIER_GLOBAL_VALUE (sname); if (! guard) { tree guard_type; /* We use a type that is big enough to contain a mutex as well as an integer counter. */ guard_type = targetm.cxx.guard_type (); guard = build_decl (DECL_SOURCE_LOCATION (decl), VAR_DECL, sname, guard_type); /* The guard should have the same linkage as what it guards. */ TREE_PUBLIC (guard) = TREE_PUBLIC (decl); TREE_STATIC (guard) = TREE_STATIC (decl); DECL_COMMON (guard) = DECL_COMMON (decl); DECL_COMDAT (guard) = DECL_COMDAT (decl); if (DECL_ONE_ONLY (decl)) make_decl_one_only (guard, cxx_comdat_group (guard)); if (TREE_PUBLIC (decl)) DECL_WEAK (guard) = DECL_WEAK (decl); DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl); DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl); DECL_ARTIFICIAL (guard) = 1; DECL_IGNORED_P (guard) = 1; TREE_USED (guard) = 1; pushdecl_top_level_and_finish (guard, NULL_TREE); } return guard; } /* Return those bits of the GUARD variable that should be set when the guarded entity is actually initialized. */ static tree get_guard_bits (tree guard) { if (!targetm.cxx.guard_mask_bit ()) { /* We only set the first byte of the guard, in order to leave room for a mutex in the high-order bits. */ guard = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (guard)), guard); guard = build1 (NOP_EXPR, build_pointer_type (char_type_node), guard); guard = build1 (INDIRECT_REF, char_type_node, guard); } return guard; } /* Return an expression which determines whether or not the GUARD variable has already been initialized. */ tree get_guard_cond (tree guard) { tree guard_value; /* Check to see if the GUARD is zero. */ guard = get_guard_bits (guard); /* Mask off all but the low bit. */ if (targetm.cxx.guard_mask_bit ()) { guard_value = integer_one_node; if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard))) guard_value = convert (TREE_TYPE (guard), guard_value); guard = cp_build_binary_op (input_location, BIT_AND_EXPR, guard, guard_value, tf_warning_or_error); } guard_value = integer_zero_node; if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard))) guard_value = convert (TREE_TYPE (guard), guard_value); return cp_build_binary_op (input_location, EQ_EXPR, guard, guard_value, tf_warning_or_error); } /* Return an expression which sets the GUARD variable, indicating that the variable being guarded has been initialized. */ tree set_guard (tree guard) { tree guard_init; /* Set the GUARD to one. */ guard = get_guard_bits (guard); guard_init = integer_one_node; if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard))) guard_init = convert (TREE_TYPE (guard), guard_init); return cp_build_modify_expr (guard, NOP_EXPR, guard_init, tf_warning_or_error); } /* Start the process of running a particular set of global constructors or destructors. Subroutine of do_[cd]tors. */ static tree start_objects (int method_type, int initp) { tree body; tree fndecl; char type[10]; /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */ if (initp != DEFAULT_INIT_PRIORITY) { char joiner; #ifdef JOINER joiner = JOINER; #else joiner = '_'; #endif sprintf (type, "%c%c%.5u", method_type, joiner, initp); } else sprintf (type, "%c", method_type); fndecl = build_lang_decl (FUNCTION_DECL, get_file_function_name (type), build_function_type (void_type_node, void_list_node)); start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED); TREE_PUBLIC (current_function_decl) = 0; /* Mark as artificial because it's not explicitly in the user's source code. */ DECL_ARTIFICIAL (current_function_decl) = 1; /* Mark this declaration as used to avoid spurious warnings. */ TREE_USED (current_function_decl) = 1; /* Mark this function as a global constructor or destructor. */ if (method_type == 'I') DECL_GLOBAL_CTOR_P (current_function_decl) = 1; else DECL_GLOBAL_DTOR_P (current_function_decl) = 1; body = begin_compound_stmt (BCS_FN_BODY); return body; } /* Finish the process of running a particular set of global constructors or destructors. Subroutine of do_[cd]tors. */ static void finish_objects (int method_type, int initp, tree body) { tree fn; /* Finish up. */ finish_compound_stmt (body); fn = finish_function (0); if (method_type == 'I') { DECL_STATIC_CONSTRUCTOR (fn) = 1; decl_init_priority_insert (fn, initp); } else { DECL_STATIC_DESTRUCTOR (fn) = 1; decl_fini_priority_insert (fn, initp); } expand_or_defer_fn (fn); } /* The names of the parameters to the function created to handle initializations and destructions for objects with static storage duration. */ #define INITIALIZE_P_IDENTIFIER "__initialize_p" #define PRIORITY_IDENTIFIER "__priority" /* The name of the function we create to handle initializations and destructions for objects with static storage duration. */ #define SSDF_IDENTIFIER "__static_initialization_and_destruction" /* The declaration for the __INITIALIZE_P argument. */ static GTY(()) tree initialize_p_decl; /* The declaration for the __PRIORITY argument. */ static GTY(()) tree priority_decl; /* The declaration for the static storage duration function. */ static GTY(()) tree ssdf_decl; /* All the static storage duration functions created in this translation unit. */ static GTY(()) VEC(tree,gc) *ssdf_decls; /* A map from priority levels to information about that priority level. There may be many such levels, so efficient lookup is important. */ static splay_tree priority_info_map; /* Begins the generation of the function that will handle all initialization and destruction of objects with static storage duration. The function generated takes two parameters of type `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is nonzero, it performs initializations. Otherwise, it performs destructions. It only performs those initializations or destructions with the indicated __PRIORITY. The generated function returns no value. It is assumed that this function will only be called once per translation unit. */ static tree start_static_storage_duration_function (unsigned count) { tree parm_types; tree type; tree body; char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32]; /* Create the identifier for this function. It will be of the form SSDF_IDENTIFIER_<number>. */ sprintf (id, "%s_%u", SSDF_IDENTIFIER, count); /* Create the parameters. */ parm_types = void_list_node; parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types); parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types); type = build_function_type (void_type_node, parm_types); /* Create the FUNCTION_DECL itself. */ ssdf_decl = build_lang_decl (FUNCTION_DECL, get_identifier (id), type); TREE_PUBLIC (ssdf_decl) = 0; DECL_ARTIFICIAL (ssdf_decl) = 1; /* Put this function in the list of functions to be called from the static constructors and destructors. */ if (!ssdf_decls) { ssdf_decls = VEC_alloc (tree, gc, 32); /* Take this opportunity to initialize the map from priority numbers to information about that priority level. */ priority_info_map = splay_tree_new (splay_tree_compare_ints, /*delete_key_fn=*/0, /*delete_value_fn=*/ (splay_tree_delete_value_fn) &free); /* We always need to generate functions for the DEFAULT_INIT_PRIORITY so enter it now. That way when we walk priorities later, we'll be sure to find the DEFAULT_INIT_PRIORITY. */ get_priority_info (DEFAULT_INIT_PRIORITY); } VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl); /* Create the argument list. */ initialize_p_decl = cp_build_parm_decl (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node); DECL_CONTEXT (initialize_p_decl) = ssdf_decl; TREE_USED (initialize_p_decl) = 1; priority_decl = cp_build_parm_decl (get_identifier (PRIORITY_IDENTIFIER), integer_type_node); DECL_CONTEXT (priority_decl) = ssdf_decl; TREE_USED (priority_decl) = 1; TREE_CHAIN (initialize_p_decl) = priority_decl; DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl; /* Put the function in the global scope. */ pushdecl (ssdf_decl); /* Start the function itself. This is equivalent to declaring the function as: static void __ssdf (int __initialize_p, init __priority_p); It is static because we only need to call this function from the various constructor and destructor functions for this module. */ start_preparsed_function (ssdf_decl, /*attrs=*/NULL_TREE, SF_PRE_PARSED); /* Set up the scope of the outermost block in the function. */ body = begin_compound_stmt (BCS_FN_BODY); return body; } /* Finish the generation of the function which performs initialization and destruction of objects with static storage duration. After this point, no more such objects can be created. */ static void finish_static_storage_duration_function (tree body) { /* Close out the function. */ finish_compound_stmt (body); expand_or_defer_fn (finish_function (0)); } /* Return the information about the indicated PRIORITY level. If no code to handle this level has yet been generated, generate the appropriate prologue. */ static priority_info get_priority_info (int priority) { priority_info pi; splay_tree_node n; n = splay_tree_lookup (priority_info_map, (splay_tree_key) priority); if (!n) { /* Create a new priority information structure, and insert it into the map. */ pi = XNEW (struct priority_info_s); pi->initializations_p = 0; pi->destructions_p = 0; splay_tree_insert (priority_info_map, (splay_tree_key) priority, (splay_tree_value) pi); } else pi = (priority_info) n->value; return pi; } /* The effective initialization priority of a DECL. */ #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \ ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \ ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl)) /* Whether a DECL needs a guard to protect it against multiple initialization. */ #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \ || DECL_ONE_ONLY (decl) \ || DECL_WEAK (decl))) /* Called from one_static_initialization_or_destruction(), via walk_tree. Walks the initializer list of a global variable and looks for temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0) and that have their DECL_CONTEXT() == NULL. For each such temporary variable, set their DECL_CONTEXT() to the current function. This is necessary because otherwise some optimizers (enabled by -O2 -fprofile-arcs) might crash when trying to refer to a temporary variable that does not have it's DECL_CONTECT() properly set. */ static tree fix_temporary_vars_context_r (tree *node, int *unused ATTRIBUTE_UNUSED, void *unused1 ATTRIBUTE_UNUSED) { gcc_assert (current_function_decl); if (TREE_CODE (*node) == BIND_EXPR) { tree var; for (var = BIND_EXPR_VARS (*node); var; var = TREE_CHAIN (var)) if (TREE_CODE (var) == VAR_DECL && !DECL_NAME (var) && DECL_ARTIFICIAL (var) && !DECL_CONTEXT (var)) DECL_CONTEXT (var) = current_function_decl; } return NULL_TREE; } /* Set up to handle the initialization or destruction of DECL. If INITP is nonzero, we are initializing the variable. Otherwise, we are destroying it. */ static void one_static_initialization_or_destruction (tree decl, tree init, bool initp) { tree guard_if_stmt = NULL_TREE; tree guard; /* If we are supposed to destruct and there's a trivial destructor, nothing has to be done. */ if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) return; /* Trick the compiler into thinking we are at the file and line where DECL was declared so that error-messages make sense, and so that the debugger will show somewhat sensible file and line information. */ input_location = DECL_SOURCE_LOCATION (decl); /* Make sure temporary variables in the initialiser all have their DECL_CONTEXT() set to a value different from NULL_TREE. This can happen when global variables initialisers are built. In that case, the DECL_CONTEXT() of the global variables _AND_ of all the temporary variables that might have been generated in the accompagning initialisers is NULL_TREE, meaning the variables have been declared in the global namespace. What we want to do here is to fix that and make sure the DECL_CONTEXT() of the temporaries are set to the current function decl. */ cp_walk_tree_without_duplicates (&init, fix_temporary_vars_context_r, NULL); /* Because of: [class.access.spec] Access control for implicit calls to the constructors, the conversion functions, or the destructor called to create and destroy a static data member is performed as if these calls appeared in the scope of the member's class. we pretend we are in a static member function of the class of which the DECL is a member. */ if (member_p (decl)) { DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl); DECL_STATIC_FUNCTION_P (current_function_decl) = 1; } /* Assume we don't need a guard. */ guard = NULL_TREE; /* We need a guard if this is an object with external linkage that might be initialized in more than one place. (For example, a static data member of a template, when the data member requires construction.) */ if (NEEDS_GUARD_P (decl)) { tree guard_cond; guard = get_guard (decl); /* When using __cxa_atexit, we just check the GUARD as we would for a local static. */ if (flag_use_cxa_atexit) { /* When using __cxa_atexit, we never try to destroy anything from a static destructor. */ gcc_assert (initp); guard_cond = get_guard_cond (guard); } /* If we don't have __cxa_atexit, then we will be running destructors from .fini sections, or their equivalents. So, we need to know how many times we've tried to initialize this object. We do initializations only if the GUARD is zero, i.e., if we are the first to initialize the variable. We do destructions only if the GUARD is one, i.e., if we are the last to destroy the variable. */ else if (initp) guard_cond = cp_build_binary_op (input_location, EQ_EXPR, cp_build_unary_op (PREINCREMENT_EXPR, guard, /*noconvert=*/1, tf_warning_or_error), integer_one_node, tf_warning_or_error); else guard_cond = cp_build_binary_op (input_location, EQ_EXPR, cp_build_unary_op (PREDECREMENT_EXPR, guard, /*noconvert=*/1, tf_warning_or_error), integer_zero_node, tf_warning_or_error); guard_if_stmt = begin_if_stmt (); finish_if_stmt_cond (guard_cond, guard_if_stmt); } /* If we're using __cxa_atexit, we have not already set the GUARD, so we must do so now. */ if (guard && initp && flag_use_cxa_atexit) finish_expr_stmt (set_guard (guard)); /* Perform the initialization or destruction. */ if (initp) { if (init) finish_expr_stmt (init); /* If we're using __cxa_atexit, register a function that calls the destructor for the object. */ if (flag_use_cxa_atexit) finish_expr_stmt (register_dtor_fn (decl)); } else finish_expr_stmt (build_cleanup (decl)); /* Finish the guard if-stmt, if necessary. */ if (guard) { finish_then_clause (guard_if_stmt); finish_if_stmt (guard_if_stmt); } /* Now that we're done with DECL we don't need to pretend to be a member of its class any longer. */ DECL_CONTEXT (current_function_decl) = NULL_TREE; DECL_STATIC_FUNCTION_P (current_function_decl) = 0; } /* Generate code to do the initialization or destruction of the decls in VARS, a TREE_LIST of VAR_DECL with static storage duration. Whether initialization or destruction is performed is specified by INITP. */ static void do_static_initialization_or_destruction (tree vars, bool initp) { tree node, init_if_stmt, cond; /* Build the outer if-stmt to check for initialization or destruction. */ init_if_stmt = begin_if_stmt (); cond = initp ? integer_one_node : integer_zero_node; cond = cp_build_binary_op (input_location, EQ_EXPR, initialize_p_decl, cond, tf_warning_or_error); finish_if_stmt_cond (cond, init_if_stmt); node = vars; do { tree decl = TREE_VALUE (node); tree priority_if_stmt; int priority; priority_info pi; /* If we don't need a destructor, there's nothing to do. Avoid creating a possibly empty if-stmt. */ if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) { node = TREE_CHAIN (node); continue; } /* Remember that we had an initialization or finalization at this priority. */ priority = DECL_EFFECTIVE_INIT_PRIORITY (decl); pi = get_priority_info (priority); if (initp) pi->initializations_p = 1; else pi->destructions_p = 1; /* Conditionalize this initialization on being in the right priority and being initializing/finalizing appropriately. */ priority_if_stmt = begin_if_stmt (); cond = cp_build_binary_op (input_location, EQ_EXPR, priority_decl, build_int_cst (NULL_TREE, priority), tf_warning_or_error); finish_if_stmt_cond (cond, priority_if_stmt); /* Process initializers with same priority. */ for (; node && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority; node = TREE_CHAIN (node)) /* Do one initialization or destruction. */ one_static_initialization_or_destruction (TREE_VALUE (node), TREE_PURPOSE (node), initp); /* Finish up the priority if-stmt body. */ finish_then_clause (priority_if_stmt); finish_if_stmt (priority_if_stmt); } while (node); /* Finish up the init/destruct if-stmt body. */ finish_then_clause (init_if_stmt); finish_if_stmt (init_if_stmt); } /* VARS is a list of variables with static storage duration which may need initialization and/or finalization. Remove those variables that don't really need to be initialized or finalized, and return the resulting list. The order in which the variables appear in VARS is in reverse order of the order in which they should actually be initialized. The list we return is in the unreversed order; i.e., the first variable should be initialized first. */ static tree prune_vars_needing_no_initialization (tree *vars) { tree *var = vars; tree result = NULL_TREE; while (*var) { tree t = *var; tree decl = TREE_VALUE (t); tree init = TREE_PURPOSE (t); /* Deal gracefully with error. */ if (decl == error_mark_node) { var = &TREE_CHAIN (t); continue; } /* The only things that can be initialized are variables. */ gcc_assert (TREE_CODE (decl) == VAR_DECL); /* If this object is not defined, we don't need to do anything here. */ if (DECL_EXTERNAL (decl)) { var = &TREE_CHAIN (t); continue; } /* Also, if the initializer already contains errors, we can bail out now. */ if (init && TREE_CODE (init) == TREE_LIST && value_member (error_mark_node, init)) { var = &TREE_CHAIN (t); continue; } /* This variable is going to need initialization and/or finalization, so we add it to the list. */ *var = TREE_CHAIN (t); TREE_CHAIN (t) = result; result = t; } return result; } /* Make sure we have told the back end about all the variables in VARS. */ static void write_out_vars (tree vars) { tree v; for (v = vars; v; v = TREE_CHAIN (v)) { tree var = TREE_VALUE (v); if (!var_finalized_p (var)) { import_export_decl (var); rest_of_decl_compilation (var, 1, 1); } } } /* Generate a static constructor (if CONSTRUCTOR_P) or destructor (otherwise) that will initialize all global objects with static storage duration having the indicated PRIORITY. */ static void generate_ctor_or_dtor_function (bool constructor_p, int priority, location_t *locus) { char function_key; tree arguments; tree fndecl; tree body; size_t i; input_location = *locus; /* ??? */ /* Was: locus->line++; */ /* We use `I' to indicate initialization and `D' to indicate destruction. */ function_key = constructor_p ? 'I' : 'D'; /* We emit the function lazily, to avoid generating empty global constructors and destructors. */ body = NULL_TREE; /* For Objective-C++, we may need to initialize metadata found in this module. This must be done _before_ any other static initializations. */ if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY) && constructor_p && objc_static_init_needed_p ()) { body = start_objects (function_key, priority); objc_generate_static_init_call (NULL_TREE); } /* Call the static storage duration function with appropriate arguments. */ for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i) { /* Calls to pure or const functions will expand to nothing. */ if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE))) { if (! body) body = start_objects (function_key, priority); arguments = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, priority), NULL_TREE); arguments = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, constructor_p), arguments); finish_expr_stmt (cp_build_function_call (fndecl, arguments, tf_warning_or_error)); } } /* Close out the function. */ if (body) finish_objects (function_key, priority, body); } /* Generate constructor and destructor functions for the priority indicated by N. */ static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data) { location_t *locus = (location_t *) data; int priority = (int) n->key; priority_info pi = (priority_info) n->value; /* Generate the functions themselves, but only if they are really needed. */ if (pi->initializations_p) generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus); if (pi->destructions_p) generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus); /* Keep iterating. */ return 0; } /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark decls referenced from front-end specific constructs; it will be called only for language-specific tree nodes. Here we must deal with member pointers. */ tree cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED) { tree t = *tp; switch (TREE_CODE (t)) { case PTRMEM_CST: if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t))) cgraph_mark_address_taken_node (cgraph_node (PTRMEM_CST_MEMBER (t))); break; case BASELINK: if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL) cgraph_mark_address_taken_node (cgraph_node (BASELINK_FUNCTIONS (t))); break; case VAR_DECL: if (DECL_VTABLE_OR_VTT_P (t)) { /* The ABI requires that all virtual tables be emitted whenever one of them is. */ tree vtbl; for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t)); vtbl; vtbl = TREE_CHAIN (vtbl)) mark_decl_referenced (vtbl); } else if (DECL_CONTEXT (t) && flag_use_repository && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL) /* If we need a static variable in a function, then we need the containing function. */ mark_decl_referenced (DECL_CONTEXT (t)); break; default: break; } return NULL; } /* Java requires that we be able to reference a local address for a method, and not be confused by PLT entries. If hidden aliases are supported, collect and return all the functions for which we should emit a hidden alias. */ static struct pointer_set_t * collect_candidates_for_java_method_aliases (void) { struct cgraph_node *node; struct pointer_set_t *candidates = NULL; #ifndef HAVE_GAS_HIDDEN return candidates; #endif for (node = cgraph_nodes; node ; node = node->next) { tree fndecl = node->decl; if (DECL_CONTEXT (fndecl) && TYPE_P (DECL_CONTEXT (fndecl)) && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl)) && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl)) { if (candidates == NULL) candidates = pointer_set_create (); pointer_set_insert (candidates, fndecl); } } return candidates; } /* Java requires that we be able to reference a local address for a method, and not be confused by PLT entries. If hidden aliases are supported, emit one for each java function that we've emitted. CANDIDATES is the set of FUNCTION_DECLs that were gathered by collect_candidates_for_java_method_aliases. */ static void build_java_method_aliases (struct pointer_set_t *candidates) { struct cgraph_node *node; #ifndef HAVE_GAS_HIDDEN return; #endif for (node = cgraph_nodes; node ; node = node->next) { tree fndecl = node->decl; if (TREE_ASM_WRITTEN (fndecl) && pointer_set_contains (candidates, fndecl)) { /* Mangle the name in a predictable way; we need to reference this from a java compiled object file. */ tree oid, nid, alias; const char *oname; char *nname; oid = DECL_ASSEMBLER_NAME (fndecl); oname = IDENTIFIER_POINTER (oid); gcc_assert (oname[0] == '_' && oname[1] == 'Z'); nname = ACONCAT (("_ZGA", oname+2, NULL)); nid = get_identifier (nname); alias = make_alias_for (fndecl, nid); TREE_PUBLIC (alias) = 1; DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN; assemble_alias (alias, oid); } } } /* Returns true iff there is a definition available for variable or function DECL. */ static bool decl_defined_p (tree decl) { if (TREE_CODE (decl) == FUNCTION_DECL) return (DECL_INITIAL (decl) != NULL_TREE); else { gcc_assert (TREE_CODE (decl) == VAR_DECL); return !DECL_EXTERNAL (decl); } } /* Complain that DECL uses a type with no linkage but is never defined. */ static void no_linkage_error (tree decl) { tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false); if (TYPE_ANONYMOUS_P (t)) { permerror (0, "%q+#D, declared using anonymous type, " "is used but never defined", decl); if (is_typedef_decl (TYPE_NAME (t))) permerror (0, "%q+#D does not refer to the unqualified type, " "so it is not used for linkage", TYPE_NAME (t)); } else permerror (0, "%q+#D, declared using local type %qT, " "is used but never defined", decl, t); } /* This routine is called at the end of compilation. Its job is to create all the code needed to initialize and destroy the global aggregates. We do the destruction first, since that way we only need to reverse the decls once. */ void cp_write_global_declarations (void) { tree vars; bool reconsider; size_t i; location_t locus; unsigned ssdf_count = 0; int retries = 0; tree decl; struct pointer_set_t *candidates; locus = input_location; at_eof = 1; /* Bad parse errors. Just forget about it. */ if (! global_bindings_p () || current_class_type || decl_namespace_list) return; if (pch_file) c_common_write_pch (); /* FIXME - huh? was input_line -= 1;*/ /* We now have to write out all the stuff we put off writing out. These include: o Template specializations that we have not yet instantiated, but which are needed. o Initialization and destruction for non-local objects with static storage duration. (Local objects with static storage duration are initialized when their scope is first entered, and are cleaned up via atexit.) o Virtual function tables. All of these may cause others to be needed. For example, instantiating one function may cause another to be needed, and generating the initializer for an object may cause templates to be instantiated, etc., etc. */ timevar_push (TV_VARCONST); emit_support_tinfos (); do { tree t; tree decl; reconsider = false; /* If there are templates that we've put off instantiating, do them now. */ instantiate_pending_templates (retries); ggc_collect (); /* Write out virtual tables as required. Note that writing out the virtual table for a template class may cause the instantiation of members of that class. If we write out vtables then we remove the class from our list so we don't have to look at it again. */ while (keyed_classes != NULL_TREE && maybe_emit_vtables (TREE_VALUE (keyed_classes))) { reconsider = true; keyed_classes = TREE_CHAIN (keyed_classes); } t = keyed_classes; if (t != NULL_TREE) { tree next = TREE_CHAIN (t); while (next) { if (maybe_emit_vtables (TREE_VALUE (next))) { reconsider = true; TREE_CHAIN (t) = TREE_CHAIN (next); } else t = next; next = TREE_CHAIN (t); } } /* Write out needed type info variables. We have to be careful looping through unemitted decls, because emit_tinfo_decl may cause other variables to be needed. New elements will be appended, and we remove from the vector those that actually get emitted. */ for (i = VEC_length (tree, unemitted_tinfo_decls); VEC_iterate (tree, unemitted_tinfo_decls, --i, t);) if (emit_tinfo_decl (t)) { reconsider = true; VEC_unordered_remove (tree, unemitted_tinfo_decls, i); } /* The list of objects with static storage duration is built up in reverse order. We clear STATIC_AGGREGATES so that any new aggregates added during the initialization of these will be initialized in the correct order when we next come around the loop. */ vars = prune_vars_needing_no_initialization (&static_aggregates); if (vars) { /* We need to start a new initialization function each time through the loop. That's because we need to know which vtables have been referenced, and TREE_SYMBOL_REFERENCED isn't computed until a function is finished, and written out. That's a deficiency in the back end. When this is fixed, these initialization functions could all become inline, with resulting performance improvements. */ tree ssdf_body; /* Set the line and file, so that it is obviously not from the source file. */ input_location = locus; ssdf_body = start_static_storage_duration_function (ssdf_count); /* Make sure the back end knows about all the variables. */ write_out_vars (vars); /* First generate code to do all the initializations. */ if (vars) do_static_initialization_or_destruction (vars, /*initp=*/true); /* Then, generate code to do all the destructions. Do these in reverse order so that the most recently constructed variable is the first destroyed. If we're using __cxa_atexit, then we don't need to do this; functions were registered at initialization time to destroy the local statics. */ if (!flag_use_cxa_atexit && vars) { vars = nreverse (vars); do_static_initialization_or_destruction (vars, /*initp=*/false); } else vars = NULL_TREE; /* Finish up the static storage duration function for this round. */ input_location = locus; finish_static_storage_duration_function (ssdf_body); /* All those initializations and finalizations might cause us to need more inline functions, more template instantiations, etc. */ reconsider = true; ssdf_count++; /* ??? was: locus.line++; */ } /* Go through the set of inline functions whose bodies have not been emitted yet. If out-of-line copies of these functions are required, emit them. */ for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i) { /* Does it need synthesizing? */ if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl) && (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl))) { /* Even though we're already at the top-level, we push there again. That way, when we pop back a few lines hence, all of our state is restored. Otherwise, finish_function doesn't clean things up, and we end up with CURRENT_FUNCTION_DECL set. */ push_to_top_level (); /* The decl's location will mark where it was first needed. Save that so synthesize method can indicate where it was needed from, in case of error */ input_location = DECL_SOURCE_LOCATION (decl); synthesize_method (decl); pop_from_top_level (); reconsider = true; } if (!DECL_SAVED_TREE (decl)) continue; /* We lie to the back end, pretending that some functions are not defined when they really are. This keeps these functions from being put out unnecessarily. But, we must stop lying when the functions are referenced, or if they are not comdat since they need to be put out now. If DECL_INTERFACE_KNOWN, then we have already set DECL_EXTERNAL appropriately, so there's no need to check again, and we do not want to clear DECL_EXTERNAL if a previous call to import_export_decl set it. This is done in a separate for cycle, because if some deferred function is contained in another deferred function later in deferred_fns varray, rest_of_compilation would skip this function and we really cannot expand the same function twice. */ import_export_decl (decl); if (DECL_NOT_REALLY_EXTERN (decl) && DECL_INITIAL (decl) && decl_needed_p (decl)) { struct cgraph_node *node = cgraph_get_node (decl), *alias, *next; DECL_EXTERNAL (decl) = 0; /* If we mark !DECL_EXTERNAL one of the same body aliases, we need to mark all of them that way. */ if (node && node->same_body) { DECL_EXTERNAL (node->decl) = 0; for (alias = node->same_body; alias; alias = alias->next) DECL_EXTERNAL (alias->decl) = 0; } /* If we mark !DECL_EXTERNAL one of the symbols in some comdat group, we need to mark all symbols in the same comdat group that way. */ if (node->same_comdat_group) for (next = node->same_comdat_group; next != node; next = next->same_comdat_group) { DECL_EXTERNAL (next->decl) = 0; if (next->same_body) { for (alias = next->same_body; alias; alias = alias->next) DECL_EXTERNAL (alias->decl) = 0; } } } /* If we're going to need to write this function out, and there's already a body for it, create RTL for it now. (There might be no body if this is a method we haven't gotten around to synthesizing yet.) */ if (!DECL_EXTERNAL (decl) && decl_needed_p (decl) && !TREE_ASM_WRITTEN (decl) && !cgraph_node (decl)->local.finalized) { /* We will output the function; no longer consider it in this loop. */ DECL_DEFER_OUTPUT (decl) = 0; /* Generate RTL for this function now that we know we need it. */ expand_or_defer_fn (decl); /* If we're compiling -fsyntax-only pretend that this function has been written out so that we don't try to expand it again. */ if (flag_syntax_only) TREE_ASM_WRITTEN (decl) = 1; reconsider = true; } } if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0)) reconsider = true; /* Static data members are just like namespace-scope globals. */ for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i) { if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl) /* Don't write it out if we haven't seen a definition. */ || DECL_IN_AGGR_P (decl)) continue; import_export_decl (decl); /* If this static data member is needed, provide it to the back end. */ if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl)) DECL_EXTERNAL (decl) = 0; } if (VEC_length (tree, pending_statics) != 0 && wrapup_global_declarations (VEC_address (tree, pending_statics), VEC_length (tree, pending_statics))) reconsider = true; retries++; } while (reconsider); /* All used inline functions must have a definition at this point. */ for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i) { if (/* Check online inline functions that were actually used. */ DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl) /* If the definition actually was available here, then the fact that the function was not defined merely represents that for some reason (use of a template repository, #pragma interface, etc.) we decided not to emit the definition here. */ && !DECL_INITIAL (decl) /* An explicit instantiation can be used to specify that the body is in another unit. It will have already verified there was a definition. */ && !DECL_EXPLICIT_INSTANTIATION (decl)) { warning (0, "inline function %q+D used but never defined", decl); /* Avoid a duplicate warning from check_global_declaration_1. */ TREE_NO_WARNING (decl) = 1; } } /* So must decls that use a type with no linkage. */ for (i = 0; VEC_iterate (tree, no_linkage_decls, i, decl); ++i) if (!decl_defined_p (decl)) no_linkage_error (decl); /* We give C linkage to static constructors and destructors. */ push_lang_context (lang_name_c); /* Generate initialization and destruction functions for all priorities for which they are required. */ if (priority_info_map) splay_tree_foreach (priority_info_map, generate_ctor_and_dtor_functions_for_priority, /*data=*/&locus); else if (c_dialect_objc () && objc_static_init_needed_p ()) /* If this is obj-c++ and we need a static init, call generate_ctor_or_dtor_function. */ generate_ctor_or_dtor_function (/*constructor_p=*/true, DEFAULT_INIT_PRIORITY, &locus); /* We're done with the splay-tree now. */ if (priority_info_map) splay_tree_delete (priority_info_map); /* Generate any missing aliases. */ maybe_apply_pending_pragma_weaks (); /* We're done with static constructors, so we can go back to "C++" linkage now. */ pop_lang_context (); /* Collect candidates for Java hidden aliases. */ candidates = collect_candidates_for_java_method_aliases (); cgraph_finalize_compilation_unit (); /* Now, issue warnings about static, but not defined, functions, etc., and emit debugging information. */ walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider); if (VEC_length (tree, pending_statics) != 0) { check_global_declarations (VEC_address (tree, pending_statics), VEC_length (tree, pending_statics)); emit_debug_global_declarations (VEC_address (tree, pending_statics), VEC_length (tree, pending_statics)); } /* Generate hidden aliases for Java. */ if (candidates) { build_java_method_aliases (candidates); pointer_set_destroy (candidates); } finish_repo (); /* The entire file is now complete. If requested, dump everything to a file. */ { int flags; FILE *stream = dump_begin (TDI_tu, &flags); if (stream) { dump_node (global_namespace, flags & ~TDF_SLIM, stream); dump_end (TDI_tu, stream); } } timevar_pop (TV_VARCONST); if (flag_detailed_statistics) { dump_tree_statistics (); dump_time_statistics (); } input_location = locus; #ifdef ENABLE_CHECKING validate_conversion_obstack (); #endif /* ENABLE_CHECKING */ } /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the function to call in parse-tree form; it has not yet been semantically analyzed. ARGS are the arguments to the function. They have already been semantically analyzed. This may change ARGS. */ tree build_offset_ref_call_from_tree (tree fn, VEC(tree,gc) **args) { tree orig_fn; VEC(tree,gc) *orig_args = NULL; tree expr; tree object; orig_fn = fn; object = TREE_OPERAND (fn, 0); if (processing_template_decl) { gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR || TREE_CODE (fn) == MEMBER_REF); if (type_dependent_expression_p (fn) || any_type_dependent_arguments_p (*args)) return build_nt_call_vec (fn, *args); orig_args = make_tree_vector_copy (*args); /* Transform the arguments and add the implicit "this" parameter. That must be done before the FN is transformed because we depend on the form of FN. */ make_args_non_dependent (*args); object = build_non_dependent_expr (object); if (TREE_CODE (fn) == DOTSTAR_EXPR) object = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error); VEC_safe_insert (tree, gc, *args, 0, object); /* Now that the arguments are done, transform FN. */ fn = build_non_dependent_expr (fn); } /* A qualified name corresponding to a bound pointer-to-member is represented as an OFFSET_REF: struct B { void g(); }; void (B::*p)(); void B::g() { (this->*p)(); } */ if (TREE_CODE (fn) == OFFSET_REF) { tree object_addr = cp_build_unary_op (ADDR_EXPR, object, 0, tf_warning_or_error); fn = TREE_OPERAND (fn, 1); fn = get_member_function_from_ptrfunc (&object_addr, fn); VEC_safe_insert (tree, gc, *args, 0, object_addr); } expr = cp_build_function_call_vec (fn, args, tf_warning_or_error); if (processing_template_decl && expr != error_mark_node) expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args); if (orig_args != NULL) release_tree_vector (orig_args); return expr; } void check_default_args (tree x) { tree arg = TYPE_ARG_TYPES (TREE_TYPE (x)); bool saw_def = false; int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE); for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i) { if (TREE_PURPOSE (arg)) saw_def = true; else if (saw_def) { error ("default argument missing for parameter %P of %q+#D", i, x); TREE_PURPOSE (arg) = error_mark_node; } } } /* Return true if function DECL can be inlined. This is used to force instantiation of methods that might be interesting for inlining. */ bool possibly_inlined_p (tree decl) { gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); if (DECL_UNINLINABLE (decl)) return false; if (!optimize || pragma_java_exceptions) return DECL_DECLARED_INLINE_P (decl); /* When optimizing, we might inline everything when flatten attribute or heuristics inlining for size or autoinlining is used. */ return true; } /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program. If DECL is a specialization or implicitly declared class member, generate the actual definition. */ void mark_used (tree decl) { HOST_WIDE_INT saved_processing_template_decl = 0; /* If DECL is a BASELINK for a single function, then treat it just like the DECL for the function. Otherwise, if the BASELINK is for an overloaded function, we don't know which function was actually used until after overload resolution. */ if (TREE_CODE (decl) == BASELINK) { decl = BASELINK_FUNCTIONS (decl); if (really_overloaded_fn (decl)) return; decl = OVL_CURRENT (decl); } /* Set TREE_USED for the benefit of -Wunused. */ TREE_USED (decl) = 1; if (DECL_CLONED_FUNCTION_P (decl)) TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1; if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DELETED_FN (decl)) { if (DECL_ARTIFICIAL (decl)) { if (DECL_OVERLOADED_OPERATOR_P (decl) == TYPE_EXPR && LAMBDA_TYPE_P (DECL_CONTEXT (decl))) { /* We mark a lambda conversion op as deleted if we can't generate it properly; see maybe_add_lambda_conv_op. */ sorry ("converting lambda which uses %<...%> to " "function pointer"); return; } } error ("deleted function %q+D", decl); error ("used here"); return; } /* If we don't need a value, then we don't need to synthesize DECL. */ if (cp_unevaluated_operand != 0) return; /* We can only check DECL_ODR_USED on variables or functions with DECL_LANG_SPECIFIC set, and these are also the only decls that we might need special handling for. */ if ((TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL) || DECL_LANG_SPECIFIC (decl) == NULL || DECL_THUNK_P (decl)) return; /* We only want to do this processing once. We don't need to keep trying to instantiate inline templates, because unit-at-a-time will make sure we get them compiled before functions that want to inline them. */ if (DECL_ODR_USED (decl)) return; /* If within finish_function, defer the rest until that function finishes, otherwise it might recurse. */ if (defer_mark_used_calls) { VEC_safe_push (tree, gc, deferred_mark_used_calls, decl); return; } /* Normally, we can wait until instantiation-time to synthesize DECL. However, if DECL is a static data member initialized with a constant, we need the value right now because a reference to such a data member is not value-dependent. */ if (TREE_CODE (decl) == VAR_DECL && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) && DECL_CLASS_SCOPE_P (decl)) { /* Don't try to instantiate members of dependent types. We cannot just use dependent_type_p here because this function may be called from fold_non_dependent_expr, and then we may see dependent types, even though processing_template_decl will not be set. */ if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl))) && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl)))) return; /* Pretend that we are not in a template, even if we are, so that the static data member initializer will be processed. */ saved_processing_template_decl = processing_template_decl; processing_template_decl = 0; } if (processing_template_decl) return; DECL_ODR_USED (decl) = 1; if (DECL_CLONED_FUNCTION_P (decl)) DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1; /* DR 757: A type without linkage shall not be used as the type of a variable or function with linkage, unless o the variable or function has extern "C" linkage (7.5 [dcl.link]), or o the variable or function is not used (3.2 [basic.def.odr]) or is defined in the same translation unit. */ if (cxx_dialect > cxx98 && decl_linkage (decl) != lk_none && !DECL_EXTERN_C_P (decl) && !DECL_ARTIFICIAL (decl) && !decl_defined_p (decl) && no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false)) { if (is_local_extern (decl)) /* There's no way to define a local extern, and adding it to the vector interferes with GC, so give an error now. */ no_linkage_error (decl); else VEC_safe_push (tree, gc, no_linkage_decls, decl); } if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl) && !DECL_INITIAL (decl) && !DECL_ARTIFICIAL (decl)) /* Remember it, so we can check it was defined. */ note_vague_linkage_fn (decl); /* Is it a synthesized method that needs to be synthesized? */ if (TREE_CODE (decl) == FUNCTION_DECL && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl) && DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)) { /* Remember the current location for a function we will end up synthesizing. Then we can inform the user where it was required in the case of error. */ DECL_SOURCE_LOCATION (decl) = input_location; /* Synthesizing an implicitly defined member function will result in garbage collection. We must treat this situation as if we were within the body of a function so as to avoid collecting live data on the stack (such as overload resolution candidates). We could just let cp_write_global_declarations handle synthesizing this function, since we just added it to deferred_fns, but doing it at the use site produces better error messages. */ ++function_depth; synthesize_method (decl); --function_depth; /* If this is a synthesized method we don't need to do the instantiation test below. */ } else if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) && DECL_TEMPLATE_INFO (decl) && (!DECL_EXPLICIT_INSTANTIATION (decl) || always_instantiate_p (decl))) /* If this is a function or variable that is an instance of some template, we now know that we will need to actually do the instantiation. We check that DECL is not an explicit instantiation because that is not checked in instantiate_decl. We put off instantiating functions in order to improve compile times. Maintaining a stack of active functions is expensive, and the inliner knows to instantiate any functions it might need. Therefore, we always try to defer instantiation. */ instantiate_decl (decl, /*defer_ok=*/true, /*expl_inst_class_mem_p=*/false); processing_template_decl = saved_processing_template_decl; } #include "gt-cp-decl2.h"
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