diff options
Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/cp/decl2.c')
-rw-r--r-- | gcc-4.2.1-5666.3/gcc/cp/decl2.c | 3934 |
1 files changed, 3934 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/cp/decl2.c b/gcc-4.2.1-5666.3/gcc/cp/decl2.c new file mode 100644 index 000000000..275baf21e --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/cp/decl2.c @@ -0,0 +1,3934 @@ +/* Process declarations and variables for C++ compiler. + Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, + 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 2, 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 COPYING. If not, write to +the Free Software Foundation, 51 Franklin Street, Fifth Floor, +Boston, MA 02110-1301, USA. */ + + +/* 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" +/* APPLE LOCAL elide global inits 3814991 */ +#include "tree-iterator.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); +/* APPLE LOCAL elide global inits 5642351 */ +static void one_static_initialization_or_destruction (tree, tree, bool, priority_info); +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); + +/* 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; + +/* Nonzero if we're done parsing and into end-of-file activities. */ + +int at_eof; + +/* Functions called along with real static constructors and destructors. */ + +tree static_ctors; +tree static_dtors; + + + +/* 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; + int type_quals; + + if (fntype == error_mark_node || ctype == error_mark_node) + return error_mark_node; + + type_quals = quals & ~TYPE_QUAL_RESTRICT; + ctype = cp_build_qualified_type (ctype, type_quals); + fntype = build_method_type_directly (ctype, TREE_TYPE (fntype), + (TREE_CODE (fntype) == METHOD_TYPE + ? TREE_CHAIN (TYPE_ARG_TYPES (fntype)) + : TYPE_ARG_TYPES (fntype))); + raises = TYPE_RAISES_EXCEPTIONS (fntype); + if (raises) + fntype = build_exception_variant (fntype, raises); + + return fntype; +} + +/* 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 (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); + 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))); + 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. 1 == DESTRUCTOR. 2 == OPERATOR. + + 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 (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp))) + expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL, + array_expr, index_exp, NULL_TREE, + /*overloaded_p=*/NULL); + 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 (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 + && IS_AGGR_TYPE (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, or NULL_TREE + if no declaration was found (and 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) + { + gcc_assert (!template_parms + || comp_template_parms (template_parms, + DECL_TEMPLATE_PARMS (function))); + 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 ("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 we did not find the method in the class, add it to avoid + spurious errors (unless the CTYPE is not yet defined, in which + case we'll only confuse ourselves when the function is declared + properly within the class. */ + if (COMPLETE_TYPE_P (ctype)) + add_method (ctype, function, NULL_TREE); + + if (pushed_scope) + pop_scope (pushed_scope); + return NULL_TREE; +} + +/* 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) +{ + if (!DECL_DEFERRED_FN (decl)) + { + DECL_DEFERRED_FN (decl) = 1; + 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)) + pedwarn ("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; + } + /* Force the compiler to know when an uninitialized static const + member is being used. */ + if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0) + TREE_USED (decl) = 1; + 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; + + 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 __typeof__ 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; + + if (DECL_NAME (value) != NULL_TREE + && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_' + && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_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) + { + /* Avoid storing attributes in template parameters: + tsubst is not ready to handle them. */ + tree type = TREE_TYPE (value); + if (TREE_CODE (type) == TEMPLATE_TYPE_PARM + || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) + sorry ("applying attributes to template parameters is not implemented"); + else + cplus_decl_attributes (&value, attrlist, 0); + } + + 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 (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE) + { + gcc_assert (error_operand_p (init) || integer_zerop (init)); + DECL_PURE_VIRTUAL_P (value) = 1; + } + 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 value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL); + + 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_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; + } + finish_decl (value, NULL_TREE, NULL_TREE); + + 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; + return value; +} + + +void +cplus_decl_attributes (tree *decl, tree attributes, int flags) +{ + if (*decl == NULL_TREE || *decl == void_type_node + || *decl == error_mark_node) + 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) + { + pedwarn ("%q+#D invalid; an anonymous union can only " + "have non-static data members", field); + continue; + } + + if (TREE_PRIVATE (field)) + pedwarn ("private member %q+#D in anonymous union", field); + else if (TREE_PROTECTED (field)) + pedwarn ("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); + + if (DECL_NAME (field)) + { + tree base; + + decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field)); + DECL_ANON_UNION_VAR_P (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); + 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 + || !same_type_p (TREE_VALUE (args), size_type_node)) + { + e = 2; + if (args && args != void_list_node) + args = TREE_CHAIN (args); + pedwarn ("%<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; +} + +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); + 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; + } + } + + if (DECL_LANG_SPECIFIC (decl)) + 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); + + 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); + } + } +} + +/* 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 backends 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 cgraph_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; + /* 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)); + + /* 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; + 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_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) = visibility; + return true; + } + /* APPLE LOCAL begin constrain visibility for templates 5813435 */ + else if (visibility > DECL_VISIBILITY (decl) + && DECL_VISIBILITY_SPECIFIED (decl) + && !lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)) + && !lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) + { + /* We also constrain implicit visibilities (for templates). */ + DECL_VISIBILITY (decl) = visibility; + return true; + } + /* APPLE LOCAL end constrain visibility for templates 5813435 */ + 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; + + /* 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)); + + 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; + + /* Anything that is exported must have default visibility. */ + if (TARGET_DLLIMPORT_DECL_ATTRIBUTES + && lookup_attribute ("dllexport", + TREE_CODE (decl) == TYPE_DECL + ? TYPE_ATTRIBUTES (TREE_TYPE (decl)) + : DECL_ATTRIBUTES (decl))) + { + DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; + DECL_VISIBILITY_SPECIFIED (decl) = 1; + } + + /* 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); + /* APPLE LOCAL mainline 2007-06-14 5195787 */ + /* Deleted 'else if'. */ + 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; + } + /* APPLE LOCAL begin mainline 2007-06-28 ms tinfo compat 4230099 */ + else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl) + && flag_visibility_ms_compat) + { + tree underlying_type = TREE_TYPE (DECL_NAME (decl)); + int underlying_vis = type_visibility (underlying_type); + if (underlying_vis == VISIBILITY_ANON + /* APPLE LOCAL begin 6983171 */ + || (TREE_CODE (underlying_type) == RECORD_TYPE + && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type))) + /* APPLE LOCAL end 6983171 */ + constrain_visibility (decl, underlying_vis); + else + DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; + } + /* APPLE LOCAL end mainline 2007-06-28 ms tinfo compat 4230099 */ + 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)))); + } + 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)); + /* APPLE LOCAL begin mainline 2007-06-14 4471483 */ + if (tvis == VISIBILITY_ANON + || ! DECL_VISIBILITY_SPECIFIED (decl)) + /* APPLE LOCAL end mainline 2007-06-14 4471483 */ + constrain_visibility (decl, tvis); + } +} + +/* 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 (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 + && ! DECL_VISIBILITY_SPECIFIED (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 if (!DECL_VISIBILITY_SPECIFIED (decl)) + { + /* 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) + && !DECL_VISIBILITY_SPECIFIED (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_array_types (TREE_TYPE (t)); + int subvis = type_visibility (ftype); + + if (subvis == VISIBILITY_ANON) + /* APPLE LOCAL begin mainline radar 6194879 */ + { + if (!in_main_input_context ()) + warning (0, "\ +%qT has a field %qD whose type uses the anonymous namespace", + type, t); + } + /* APPLE LOCAL end mainline radar 6194879 */ + else if (IS_AGGR_TYPE (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) + /* APPLE LOCAL begin mainline radar 6194879 */ + { + if (!in_main_input_context()) + warning (0, "\ +%qT has a base %qT whose type uses the anonymous namespace", + type, TREE_TYPE (t)); + } + /* APPLE LOCAL end mainline radar 6194879 */ + else if (vis < VISIBILITY_HIDDEN + && subvis >= VISIBILITY_HIDDEN) + warning (OPT_Wattributes, "\ +%qT declared with greater visibility than its base %qT", + type, TREE_TYPE (t)); + } +} + +/* APPLE LOCAL begin weak types 5954418 */ +static bool +typeinfo_comdat (tree type) +{ + tree binfo, base_binfo; + int j; + + if (lookup_attribute ("weak", TYPE_ATTRIBUTES (type))) + return true; + + for (binfo = TYPE_BINFO (type), j = 0; + BINFO_BASE_ITERATE (binfo, j, base_binfo); ++j) + { + if (typeinfo_comdat (BINFO_TYPE (base_binfo))) + return true; + } + + return false; +} +/* APPLE LOCAL end weak types 5954418 */ + +/* 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) + /* APPLE LOCAL begin weak types 5954418 */ + && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))) + || typeinfo_comdat (type)); + /* APPLE LOCAL end weak types 5954418 */ + 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_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 + { + cxx_mark_addressable (decl); + temp = build1 (ADDR_EXPR, build_pointer_type (type), 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 (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_ONE_ONLY (guard) = DECL_ONE_ONLY (decl); + if (TREE_PUBLIC (decl)) + DECL_WEAK (guard) = DECL_WEAK (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 (BIT_AND_EXPR, guard, guard_value); + } + + 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 (EQ_EXPR, guard, guard_value); +} + +/* 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 build_modify_expr (guard, NOP_EXPR, guard_init); +} + +/* 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, +/* APPLE LOCAL begin mainline 2006-11-01 5125268 */ \ + get_file_function_name (type), +/* APPLE LOCAL end mainline 2006-11-01 5125268 */ \ + build_function_type (void_type_node, + void_list_node)); + start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED); + + /* It can be a static function as long as collect2 does not have + to scan the object file to find its ctor/dtor routine. */ + TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors; + + /* APPLE LOCAL begin mainline 4.3 2007-06-28 4992129 */ + /* Mark as artificial because it's not explicitly in the user's + source code. */ + DECL_ARTIFICIAL (current_function_decl) = 1; + /* APPLE LOCAL end mainline 4.3 2007-06-28 4992129 */ + + /* 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; + DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1; + + /* APPLE LOCAL begin static structors in __StaticInit section */ +#ifdef STATIC_INIT_SECTION + /* What should we do for kextabi == 2? */ + if (!TARGET_KEXTABI) + DECL_SECTION_NAME (current_function_decl) = + build_string (strlen (STATIC_INIT_SECTION), STATIC_INIT_SECTION); +#endif + /* APPLE LOCAL end static structors in __StaticInit section */ + + body = begin_compound_stmt (BCS_FN_BODY); + + /* We cannot allow these functions to be elided, even if they do not + have external linkage. And, there's no point in deferring + compilation of these functions; they're all going to have to be + out anyhow. */ + DECL_INLINE (current_function_decl) = 0; + DECL_UNINLINABLE (current_function_decl) = 1; + + 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); + expand_or_defer_fn (fn); + + /* When only doing semantic analysis, and no RTL generation, we + can't call functions that directly emit assembly code; there is + no assembly file in which to put the code. */ + if (flag_syntax_only) + return; + + if (targetm.have_ctors_dtors) + { + rtx fnsym = XEXP (DECL_RTL (fn), 0); + cgraph_mark_needed_node (cgraph_node (fn)); + if (method_type == 'I') + (* targetm.asm_out.constructor) (fnsym, initp); + else + (* targetm.asm_out.destructor) (fnsym, initp); + } +} + +/* 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; + + /* APPLE LOCAL begin static structors in __StaticInit section */ +#ifdef STATIC_INIT_SECTION + /* What should we do for kextabi == 2? */ + if (!TARGET_KEXTABI) + DECL_SECTION_NAME (ssdf_decl) = build_string (strlen (STATIC_INIT_SECTION), + STATIC_INIT_SECTION); +#endif + /* APPLE LOCAL end static structors in __StaticInit section */ + + /* 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); + + /* This function must not be deferred because we are depending on + its compilation to tell us what is TREE_SYMBOL_REFERENCED. */ + DECL_INLINE (ssdf_decl) = 0; + DECL_UNINLINABLE (ssdf_decl) = 1; + + 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. */ + +/* APPLE LOCAL begin Radar 4539933 */ +/* Need guard variables for explicitly instantiated templated + static data (darwin only) */ +#define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \ + || DECL_ONE_ONLY (decl) \ + || DECL_WEAK (decl) \ + || (TARGET_WEAK_NOT_IN_ARCHIVE_TOC && DECL_LANG_SPECIFIC (decl) \ + && (DECL_EXPLICIT_INSTANTIATION (decl) \ + || DECL_TEMPLATE_SPECIALIZATION (decl))))) +/* APPLE LOCAL end Radar 4539933 */ + +/* APPLE LOCAL begin elide global inits 3814991 */ +/* Return true if the tree is proved to do nothing (have no lasting + side effects). + + Ideally, we'd like for the backend to obviate most of this code, + such as folding and empty statement lists inside BIND_EXPRs and so + on, but until they do, we should handle them here. */ + +static bool +does_nothing_p (tree exp) +{ + tree_stmt_iterator i; + + if (exp == NULL_TREE) + return true; + if (TREE_CODE (exp) == STATEMENT_LIST) + { + for (i = tsi_start (exp); !tsi_end_p (i); tsi_next (&i)) + { + if (!does_nothing_p (*tsi_stmt_ptr (i))) + return false; + } + return true; + } + else if (TREE_CODE (exp) == CALL_EXPR) + { + tree decl = NULL_TREE; + if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR + && (TREE_CODE (decl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) + == FUNCTION_DECL)) + { + if (TREE_OPERAND (exp, 1)) + { + if (TREE_CODE (TREE_OPERAND (exp, 1)) != TREE_LIST) + return false; + if (TREE_CHAIN (TREE_OPERAND (exp, 1))) + return false; + if (TREE_SIDE_EFFECTS (TREE_VALUE (TREE_OPERAND (exp, 1)))) + return false; + } + + if (DECL_UNINLINABLE (decl)) + return false; + + /* Avoid inlining if -fno-inline is in effect when + optimiing, unless of course always_inline is given. */ + if (!((flag_inline_trees || !flag_no_inline) && !flag_really_no_inline) + && !lookup_attribute ("always_inline", DECL_ATTRIBUTES (decl))) + return false; + + exp = DECL_SAVED_TREE (decl); + + if (!exp) + return false; + + return does_nothing_p (exp); + } + + /* Other forms of CALL_EXPRs. */ + return false; + } + else if (TREE_CODE (exp) == EXPR_STMT) + return does_nothing_p (TREE_OPERAND (exp, 0)); + else if (TREE_CODE (exp) == BIND_EXPR) + return does_nothing_p (BIND_EXPR_BODY (exp)); + else if (TREE_CODE (exp) == MODIFY_EXPR) + { + bool was_set_zero = (integer_zerop (TREE_OPERAND (exp, 1)) + || real_zerop (TREE_OPERAND (exp, 1))); + + if (TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1))) + return false; + exp = TREE_OPERAND (exp, 0); + if (TREE_SIDE_EFFECTS (exp)) + return false; + if (TREE_CODE (exp) != VAR_DECL) + { + /* Modifications of this object with zero don't count either + as all objects initialized by file scope constructors are + required to be zero initialized first. */ + if (was_set_zero + && TREE_CODE (exp) == COMPONENT_REF + && !TREE_SIDE_EFFECTS (exp) + && TREE_CODE (TREE_OPERAND (exp, 1)) == FIELD_DECL + && TREE_CODE (exp=TREE_OPERAND (exp, 0)) == INDIRECT_REF + && TREE_CODE (exp=TREE_OPERAND (exp, 0)) == PARM_DECL + && DECL_NAME (exp) == this_identifier) + return true; + + return false; + } + if (TREE_STATIC (exp)) + return false; + + /* Modifications of stack variables without side-effects don't + count as side effects. */ + return true; + } + else if (TREE_CODE (exp) == COND_EXPR) + { + tree cond = TREE_OPERAND (exp, 0); + cond = fold (cond); + if (integer_onep (cond)) + return does_nothing_p (TREE_OPERAND (exp, 1)); + else if (integer_zerop (cond)) + return does_nothing_p (TREE_OPERAND (exp, 2)); + } + else if (TREE_CODE (exp) == TRY_CATCH_EXPR) + return does_nothing_p (TREE_OPERAND (exp, 0)); + + return false; +} +/* APPLE LOCAL end elide global inits 3814991 */ + +/* APPLE LOCAL begin Wglobal-constructors 6324584 */ +static void +warn_init (tree decl) +{ + warning (OPT_Wglobal_constructors, "%J%qD requires global construction", decl, decl); +} + +static void +warn_deinit (tree decl) +{ + warning (OPT_Wglobal_constructors, "%J%qD requires global destruction", decl, decl); +} +/* APPLE LOCAL end Wglobal-constructors 6324584 */ + +/* 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 +/* APPLE LOCAL begin elide global inits 5642351 */ +one_static_initialization_or_destruction (tree decl, tree init, bool initp, + priority_info pi) +/* APPLE LOCAL end elide global inits 5642351 */ +{ + 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); + + /* 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); + + /* APPLE LOCAL begin elide global inits 5642351 */ + /* We can't avoid running the guard code. */ + if (initp) + { + pi->initializations_p = 1; + /* APPLE LOCAL Wglobal-constructors 6324584 */ + warn_init (decl); + } + else + { + pi->destructions_p = 1; + /* APPLE LOCAL Wglobal-constructors 6324584 */ + warn_deinit (decl); + } + /* APPLE LOCAL end elide global inits 5642351 */ + + /* 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 (EQ_EXPR, + build_unary_op (PREINCREMENT_EXPR, + guard, + /*noconvert=*/1), + integer_one_node); + else + guard_cond + = cp_build_binary_op (EQ_EXPR, + build_unary_op (PREDECREMENT_EXPR, + guard, + /*noconvert=*/1), + integer_zero_node); + + 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) + /* APPLE LOCAL begin elide global inits 3814991 5642351 */ + { + if (!does_nothing_p (init)) + { + pi->initializations_p = 1; + /* APPLE LOCAL Wglobal-constructors 6324584 */ + if (!guard) warn_init (decl); + finish_expr_stmt (init); + } + } + /* APPLE LOCAL end elide global inits 3814991 5642351 */ + + /* If we're using __cxa_atexit, register a function that calls the + destructor for the object. */ + if (flag_use_cxa_atexit) + /* APPLE LOCAL begin elide global inits 5642351 */ + { + pi->initializations_p = 1; + /* APPLE LOCAL begin Wglobal-constructors 6324584 */ + if (!guard + && !TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl))) + warn_deinit (decl); + /* APPLE LOCAL end Wglobal-constructors 6324584 */ + finish_expr_stmt (register_dtor_fn (decl)); + } + /* APPLE LOCAL end global inits 5642351 */ + } + else + /* APPLE LOCAL begin elide global inits 5642351 */ + { + pi->destructions_p = 1; + /* APPLE LOCAL Wglobal-constructors 6324584 */ + if (!guard) warn_deinit (decl); + finish_expr_stmt (build_cleanup (decl)); + } + /* APPLE LOCAL end global inits 5642351 */ + + /* 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 (EQ_EXPR, + initialize_p_decl, + cond); + 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); + /* APPLE LOCAL begin elide global inits 5642351 */ + /* removed pi->initializations_p and destructions_p setting */ + /* APPLE LOCAL end elide global inits 5642351 */ + + /* 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 (EQ_EXPR, + priority_decl, + build_int_cst (NULL_TREE, priority)); + 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), + /* APPLE LOCAL elide global inits 5642351 */ + TREE_PURPOSE (node), initp, pi); + + /* 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; + } + + /* APPLE LOCAL begin elide global inits 3814991 */ + /* If the initializer does nothing of interest, don't create the + expense of a global constructor. */ + if (init + && does_nothing_p (init) + && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)) + /* If we have guards, ensure we run them. */ + && !NEEDS_GUARD_P (decl)) + { + var = &TREE_CHAIN (t); + continue; + } + /* APPLE LOCAL end elide global inits 3814991 */ + + /* 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 gobal 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; +#ifdef USE_MAPPED_LOCATION + /* ??? */ +#else + locus->line++; +#endif + + /* 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); + static_ctors = objc_generate_static_init_call (static_ctors); + /* APPLE LOCAL begin Wglobal-constructors 6324584 */ + warning (OPT_Wglobal_constructors, + "GNU Objective-C runtime requires global initialization"); + /* APPLE LOCAL end Wglobal-constructors 6324584 */ + } + + /* 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 (build_function_call (fndecl, arguments)); + } + } + + /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in + calls to any functions marked with attributes indicating that + they should be called at initialization- or destruction-time. */ + if (priority == DEFAULT_INIT_PRIORITY) + { + tree fns; + + for (fns = constructor_p ? static_ctors : static_dtors; + fns; + fns = TREE_CHAIN (fns)) + { + fndecl = TREE_VALUE (fns); + + /* APPLE LOCAL begin Wglobal-constructors 6324584 */ + if (constructor_p) + warn_init (fndecl); + else + warn_deinit (fndecl); + /* APPLE LOCAL end Wglobal-constructors 6324584 */ + + /* Calls to pure/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); + finish_expr_stmt (build_function_call (fndecl, NULL_TREE)); + } + } + } + + /* 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 + || (priority == DEFAULT_INIT_PRIORITY && static_ctors)) + generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus); + if (pi->destructions_p + || (priority == DEFAULT_INIT_PRIORITY && static_dtors)) + 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 frontend 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 from ATTRIBUTE_UNUSED) +{ + tree t = *tp; + + switch (TREE_CODE (t)) + { + case PTRMEM_CST: + if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t))) + cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t))); + break; + case BASELINK: + if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL) + cgraph_mark_needed_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) + && 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, emit one for each java function that we've emitted. */ + +static void +build_java_method_aliases (void) +{ + 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) + && DECL_CONTEXT (fndecl) + && TYPE_P (DECL_CONTEXT (fndecl)) + && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl)) + && TARGET_USE_LOCAL_THUNK_ALIAS_P (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); + } + } +} + +/* APPLE LOCAL begin radar 4721858 */ +static void emit_deferred (location_t *); +/* APPLE LOCAL end radar 4721858 */ + +/* This routine is called from the last rule in yyparse (). + 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_finish_file (void) +{ + /* APPLE LOCAL begin radar 4721858 */ + location_t locus; + /* APPLE LOCAL end radar 4721858 */ + + locus = input_location; + at_eof = 1; + + /* Bad parse errors. Just forget about it. */ + if (! global_bindings_p () || current_class_type || decl_namespace_list) + return; + + /* APPLE LOCAL radar 4874613 */ + /* dump of pch file moved to c_parse_file (). */ + +#ifdef USE_MAPPED_LOCATION + /* FIXME - huh? */ +#else + /* Otherwise, GDB can get confused, because in only knows + about source for LINENO-1 lines. */ + input_line -= 1; +#endif + + /* 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 (); + +/* APPLE LOCAL begin radar 4721858 */ + emit_instantiate_pending_templates (&locus); + + emit_deferred (&locus); +} + +/* This routine emits pending functions and instatiates pending templates + as more opportunities arises. */ + +void +emit_instantiate_pending_templates (location_t *locusp) +{ + tree vars; + bool reconsider; + size_t i; + unsigned ssdf_count = 0; + int retries = 0; + + /* APPLE LOCAL radar 4874626 */ + /* initialization removed. */ + at_eof = 1; +/* APPLE LOCAL end radar 4721858 */ + + 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. */ + /* APPLE LOCAL radar 4721858 */ + input_location = *locusp; + 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. */ + /* APPLE LOCAL radar 4721858 */ + input_location = *locusp; + 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++; +#ifdef USE_MAPPED_LOCATION + /* ??? */ +#else + /* APPLE LOCAL radar 4721858 */ + locusp->line++; +#endif + } + + /* 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_ARTIFICIAL (decl) && ! DECL_INITIAL (decl) + && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (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)) + DECL_EXTERNAL (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)) + 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; + /* APPLE LOCAL begin write used class statics 20020226 --turly */ +#ifdef MACHOPIC_VAR_REFERRED_TO_P + else + if (TREE_USED (decl) && DECL_INITIAL (decl) != 0 + && DECL_INITIAL (decl) != error_mark_node + && TREE_CODE (DECL_INITIAL (decl)) != CONSTRUCTOR + && DECL_EXTERNAL (decl) + && MACHOPIC_VAR_REFERRED_TO_P (IDENTIFIER_POINTER ( + DECL_ASSEMBLER_NAME (decl)))) + { + /* Force a local copy of this decl to be written. */ + DECL_EXTERNAL (decl) = 0; + TREE_PUBLIC (decl) = 0; + } +#endif + /* APPLE LOCAL end write used class statics 20020226 --turly */ + } + 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); +/* APPLE LOCAL begin radar 4721858 */ +} + +static void +emit_deferred (location_t *locusp) +{ + size_t i; + tree decl; + bool reconsider = false; +/* APPLE LOCAL end radar 4721858 */ + /* 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. */ + TREE_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; + } + } + + /* 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, + /* APPLE LOCAL radar 4721858 */ + /*data=*/locusp); + else + { + /* If we have a ctor or this is obj-c++ and we need a static init, + call generate_ctor_or_dtor_function. */ + if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ())) + generate_ctor_or_dtor_function (/*constructor_p=*/true, + /* APPLE LOCAL radar 4721858 */ + DEFAULT_INIT_PRIORITY, locusp); + if (static_dtors) + generate_ctor_or_dtor_function (/*constructor_p=*/false, + /* APPLE LOCAL radar 4721858 */ + DEFAULT_INIT_PRIORITY, locusp); + } + + /* 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 (); + + cgraph_finalize_compilation_unit (); + cgraph_optimize (); + + /* 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. */ + build_java_method_aliases (); + + 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 (); + } + /* APPLE LOCAL radar 4721858 */ + input_location = *locusp; + +#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. */ + +tree +build_offset_ref_call_from_tree (tree fn, tree args) +{ + tree orig_fn; + tree orig_args; + tree expr; + tree object; + + orig_fn = fn; + orig_args = args; + 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_min_nt (CALL_EXPR, fn, args, NULL_TREE); + + /* 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. */ + args = build_non_dependent_args (args); + if (TREE_CODE (fn) == DOTSTAR_EXPR) + object = build_unary_op (ADDR_EXPR, object, 0); + object = build_non_dependent_expr (object); + args = tree_cons (NULL_TREE, object, args); + /* 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 = build_unary_op (ADDR_EXPR, object, 0); + fn = TREE_OPERAND (fn, 1); + fn = get_member_function_from_ptrfunc (&object_addr, fn); + args = tree_cons (NULL_TREE, object_addr, args); + } + + expr = build_function_call (fn, args); + if (processing_template_decl && expr != error_mark_node) + return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE); + 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; + } + } +} + +/* 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); + } + + TREE_USED (decl) = 1; + if (DECL_CLONED_FUNCTION_P (decl)) + TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1; + /* If we don't need a value, then we don't need to synthesize DECL. */ + if (skip_evaluation) + 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; + + if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl) + && !TREE_ASM_WRITTEN (decl)) + /* Remember it, so we can check it was defined. */ + { + if (DECL_DEFERRED_FN (decl)) + return; + + /* 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. */ + if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl) + && !DECL_THUNK_P (decl)) + DECL_SOURCE_LOCATION (decl) = input_location; + + note_vague_linkage_fn (decl); + } + + assemble_external (decl); + + /* Is it a synthesized method that needs to be synthesized? */ + if (TREE_CODE (decl) == FUNCTION_DECL + && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl) + && DECL_ARTIFICIAL (decl) + && !DECL_THUNK_P (decl) + && ! DECL_INITIAL (decl) + /* Kludge: don't synthesize for default args. Unfortunately this + rules out initializers of namespace-scoped objects too, but + it's sort-of ok if the implicit ctor or dtor decl keeps + pointing to the class location. */ + && current_function_decl) + { + synthesize_method (decl); + /* If we've already synthesized the method we don't need to + do the instantiation test below. */ + } + else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL) + && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl) + && (!DECL_EXPLICIT_INSTANTIATION (decl) + || (TREE_CODE (decl) == FUNCTION_DECL + && DECL_INLINE (DECL_TEMPLATE_RESULT + (template_for_substitution (decl)))) + /* We need to instantiate static data members so that there + initializers are available in integral constant + expressions. */ + || (TREE_CODE (decl) == VAR_DECL + && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_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" |