/* Process declarations and variables for C++ compiler.
Copyright (C) 1988-2022 Free Software Foundation, Inc.
Hacked by Michael Tiemann (tiemann@cygnus.com)
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
. */
/* 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 "memmodel.h"
#include "target.h"
#include "cp-tree.h"
#include "c-family/c-common.h"
#include "timevar.h"
#include "stringpool.h"
#include "cgraph.h"
#include "varasm.h"
#include "attribs.h"
#include "stor-layout.h"
#include "calls.h"
#include "decl.h"
#include "toplev.h"
#include "c-family/c-objc.h"
#include "c-family/c-pragma.h"
#include "dumpfile.h"
#include "intl.h"
#include "c-family/c-ada-spec.h"
#include "asan.h"
#include "optabs-query.h"
#include "omp-general.h"
/* Id for dumping the raw trees. */
int raw_dump_id;
extern cpp_reader *parse_in;
static tree start_objects (bool, unsigned, bool);
static tree finish_objects (bool, unsigned, tree, bool = true);
static tree start_partial_init_fini_fn (bool, unsigned, unsigned);
static void finish_partial_init_fini_fn (tree);
static void emit_partial_init_fini_fn (bool, unsigned, tree,
unsigned, location_t);
static void one_static_initialization_or_destruction (bool, tree, tree);
static void generate_ctor_or_dtor_function (bool, unsigned, tree, location_t);
static tree prune_vars_needing_no_initialization (tree *);
static void write_out_vars (tree);
static void import_export_class (tree);
static tree get_guard_bits (tree);
static void determine_visibility_from_class (tree, tree);
static bool determine_hidden_inline (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 *pending_statics;
/* A list of functions which were declared inline, but which we
may need to emit outline anyway. */
static GTY(()) vec *deferred_fns;
/* A list of decls that use types with no linkage, which we need to make
sure are defined. */
static GTY(()) vec *no_linkage_decls;
/* A vector of alternating decls and identifiers, where the latter
is to be an alias for the former if the former is defined. */
static GTY(()) vec *mangling_aliases;
/* hash traits for declarations. Hashes single decls via
DECL_ASSEMBLER_NAME_RAW. */
struct mangled_decl_hash : ggc_remove
{
typedef tree value_type; /* A DECL. */
typedef tree compare_type; /* An identifier. */
static hashval_t hash (const value_type decl)
{
return IDENTIFIER_HASH_VALUE (DECL_ASSEMBLER_NAME_RAW (decl));
}
static bool equal (const value_type existing, compare_type candidate)
{
tree name = DECL_ASSEMBLER_NAME_RAW (existing);
return candidate == name;
}
static const bool empty_zero_p = true;
static inline void mark_empty (value_type &p) {p = NULL_TREE;}
static inline bool is_empty (value_type p) {return !p;}
static bool is_deleted (value_type e)
{
return e == reinterpret_cast (1);
}
static void mark_deleted (value_type &e)
{
e = reinterpret_cast (1);
}
};
/* A hash table of decls keyed by mangled name. Used to figure out if
we need compatibility aliases. */
static GTY(()) hash_table *mangled_decls;
// Hash table mapping priority to lists of variables or functions.
struct priority_map_traits
{
typedef unsigned key_type;
typedef tree value_type;
static const bool maybe_mx = true;
static hashval_t hash (key_type v)
{
return hashval_t (v);
}
static bool equal_keys (key_type k1, key_type k2)
{
return k1 == k2;
}
template static void remove (T &)
{
}
// Zero is not a priority
static const bool empty_zero_p = true;
template static bool is_empty (const T &entry)
{
return entry.m_key == 0;
}
template static void mark_empty (T &entry)
{
entry.m_key = 0;
}
// Entries are not deleteable
template static bool is_deleted (const T &)
{
return false;
}
template static void mark_deleted (T &)
{
gcc_unreachable ();
}
};
typedef hash_map priority_map_t;
/* A pair of such hash tables, indexed by initp -- one for fini and
one for init. The fini table is only ever used when !cxa_atexit. */
static GTY(()) priority_map_t *static_init_fini_fns[2];
/* Nonzero if we're done parsing and into end-of-file activities. */
int at_eof;
/* True if note_mangling_alias should enqueue mangling aliases for
later generation, rather than emitting them right away. */
bool defer_mangling_aliases = true;
/* 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,
cp_ref_qualifier rqual)
{
if (fntype == error_mark_node || ctype == error_mark_node)
return error_mark_node;
gcc_assert (FUNC_OR_METHOD_TYPE_P (fntype));
cp_cv_quals type_quals = quals & ~TYPE_QUAL_RESTRICT;
ctype = cp_build_qualified_type (ctype, type_quals);
tree newtype
= build_method_type_directly (ctype, TREE_TYPE (fntype),
(TREE_CODE (fntype) == METHOD_TYPE
? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
: TYPE_ARG_TYPES (fntype)));
if (tree attrs = TYPE_ATTRIBUTES (fntype))
newtype = cp_build_type_attribute_variant (newtype, attrs);
newtype = build_cp_fntype_variant (newtype, rqual,
TYPE_RAISES_EXCEPTIONS (fntype),
TYPE_HAS_LATE_RETURN_TYPE (fntype));
return newtype;
}
/* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
return type changed to NEW_RET. */
tree
change_return_type (tree new_ret, tree fntype)
{
if (new_ret == error_mark_node)
return fntype;
if (same_type_p (new_ret, TREE_TYPE (fntype)))
return fntype;
tree newtype;
tree args = TYPE_ARG_TYPES (fntype);
if (TREE_CODE (fntype) == FUNCTION_TYPE)
{
newtype = build_function_type (new_ret, args);
newtype = apply_memfn_quals (newtype,
type_memfn_quals (fntype));
}
else
newtype = build_method_type_directly
(class_of_this_parm (fntype), new_ret, TREE_CHAIN (args));
if (tree attrs = TYPE_ATTRIBUTES (fntype))
newtype = cp_build_type_attribute_variant (newtype, attrs);
newtype = cxx_copy_lang_qualifiers (newtype, fntype);
return newtype;
}
/* Build a PARM_DECL of FN with NAME and TYPE, and set DECL_ARG_TYPE
appropriately. */
tree
cp_build_parm_decl (tree fn, tree name, tree type)
{
tree parm = build_decl (input_location,
PARM_DECL, name, type);
DECL_CONTEXT (parm) = fn;
/* 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 of FN for a parameter of the indicated TYPE, with the
indicated NAME. */
tree
build_artificial_parm (tree fn, tree name, tree type)
{
tree parm = cp_build_parm_decl (fn, 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 = DECL_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 (fn, vtt_parm_identifier, vtt_parm_type);
/* First add it to DECL_ARGUMENTS between 'this' and the real args... */
DECL_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 (fn, in_charge_identifier, integer_type_node);
DECL_CHAIN (parm) = parms;
parms = parm;
arg_types = hash_tree_chain (integer_type_node, arg_types);
/* Insert our new parameter(s) into the list. */
DECL_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_ATTRIBUTES (TREE_TYPE (fn)))
fntype = (cp_build_type_attribute_variant
(fntype, TYPE_ATTRIBUTES (TREE_TYPE (fn))));
fntype = cxx_copy_lang_qualifiers (fntype, TREE_TYPE (fn));
TREE_TYPE (fn) = fntype;
/* Now we've got the in-charge parameter. */
DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
}
/* Classes overload their constituent function names automatically.
When a function name is declared in a record structure,
its name is changed to it overloaded name. Since names for
constructors and destructors can conflict, we place a leading
'$' for destructors.
CNAME is the name of the class we are grokking for.
FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
FLAGS contains bits saying what's special about today's
arguments. DTOR_FLAG == DESTRUCTOR.
If FUNCTION is a destructor, then we must add the `auto-delete' field
as a second parameter. There is some hair associated with the fact
that we must "declare" this variable in the manner consistent with the
way the rest of the arguments were declared.
QUALS are the qualifiers for the this pointer. */
void
grokclassfn (tree ctype, tree function, enum overload_flags flags)
{
tree fn_name = DECL_NAME (function);
/* Even within an `extern "C"' block, members get C++ linkage. See
[dcl.link] for details. */
SET_DECL_LANGUAGE (function, lang_cplusplus);
if (fn_name == NULL_TREE)
{
error ("name missing for member function");
fn_name = get_identifier ("");
DECL_NAME (function) = fn_name;
}
DECL_CONTEXT (function) = ctype;
if (flags == DTOR_FLAG)
DECL_CXX_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.
If INDEX_EXP is non-NULL, then that is the index expression,
otherwise INDEX_EXP_LIST is the list of index expressions. */
tree
grok_array_decl (location_t loc, tree array_expr, tree index_exp,
vec **index_exp_list, tsubst_flags_t complain)
{
tree type;
tree expr;
tree orig_array_expr = array_expr;
tree orig_index_exp = index_exp;
vec *orig_index_exp_list
= index_exp_list ? *index_exp_list : NULL;
tree overload = NULL_TREE;
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)
|| (index_exp ? type_dependent_expression_p (index_exp)
: any_type_dependent_arguments_p (*index_exp_list)))
{
if (index_exp == NULL)
index_exp = build_min_nt_call_vec (ovl_op_identifier (ARRAY_REF),
*index_exp_list);
return build_min_nt_loc (loc, ARRAY_REF, array_expr, index_exp,
NULL_TREE, NULL_TREE);
}
array_expr = build_non_dependent_expr (array_expr);
if (index_exp)
index_exp = build_non_dependent_expr (index_exp);
else
{
orig_index_exp_list = make_tree_vector_copy (*index_exp_list);
make_args_non_dependent (*index_exp_list);
}
}
type = TREE_TYPE (array_expr);
gcc_assert (type);
type = non_reference (type);
/* If they have an `operator[]', use that. */
if (MAYBE_CLASS_TYPE_P (type)
|| (index_exp && MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
|| (index_exp == NULL_TREE
&& !(*index_exp_list)->is_empty ()
&& MAYBE_CLASS_TYPE_P (TREE_TYPE ((*index_exp_list)->last ()))))
{
if (index_exp)
expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr,
index_exp, NULL_TREE, NULL_TREE,
&overload, complain);
else if ((*index_exp_list)->is_empty ())
expr = build_op_subscript (loc, array_expr, index_exp_list, &overload,
complain);
else
{
expr = build_op_subscript (loc, array_expr, index_exp_list,
&overload, complain & tf_decltype);
if (expr == error_mark_node)
{
tree idx = build_x_compound_expr_from_vec (*index_exp_list, NULL,
tf_none);
if (idx != error_mark_node)
expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr,
idx, NULL_TREE, NULL_TREE, &overload,
complain & tf_decltype);
if (expr == error_mark_node)
{
overload = NULL_TREE;
expr = build_op_subscript (loc, array_expr, index_exp_list,
&overload, complain);
}
else
/* If it would be valid albeit deprecated expression in C++20,
just pedwarn on it and treat it as if wrapped in (). */
pedwarn (loc, OPT_Wcomma_subscript,
"top-level comma expression in array subscript "
"changed meaning in C++23");
}
}
}
else
{
tree p1, p2, i1, i2;
bool swapped = false;
/* 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 || VECTOR_TYPE_P (type))
p1 = array_expr;
else
p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
if (index_exp == NULL_TREE)
{
if ((*index_exp_list)->is_empty ())
{
error_at (loc, "built-in subscript operator without expression "
"list");
return error_mark_node;
}
tree idx = build_x_compound_expr_from_vec (*index_exp_list, NULL,
tf_none);
if (idx != error_mark_node)
/* If it would be valid albeit deprecated expression in C++20,
just pedwarn on it and treat it as if wrapped in (). */
pedwarn (loc, OPT_Wcomma_subscript,
"top-level comma expression in array subscript "
"changed meaning in C++23");
else
{
error_at (loc, "built-in subscript operator with more than one "
"expression in expression list");
return error_mark_node;
}
index_exp = idx;
}
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)
swapped = true, array_expr = p2, index_exp = i1;
else
{
error_at (loc, "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");
if (TYPE_PTR_P (TREE_TYPE (array_expr)))
array_expr = mark_rvalue_use (array_expr);
else
array_expr = mark_lvalue_use_nonread (array_expr);
index_exp = mark_rvalue_use (index_exp);
if (swapped
&& flag_strong_eval_order == 2
&& (TREE_SIDE_EFFECTS (array_expr) || TREE_SIDE_EFFECTS (index_exp)))
expr = build_array_ref (input_location, index_exp, array_expr);
else
expr = build_array_ref (input_location, array_expr, index_exp);
}
if (processing_template_decl && expr != error_mark_node)
{
if (overload != NULL_TREE)
{
if (orig_index_exp == NULL_TREE)
{
expr = build_min_non_dep_op_overload (expr, overload,
orig_array_expr,
orig_index_exp_list);
release_tree_vector (orig_index_exp_list);
return expr;
}
return build_min_non_dep_op_overload (ARRAY_REF, expr, overload,
orig_array_expr,
orig_index_exp);
}
if (orig_index_exp == NULL_TREE)
{
orig_index_exp
= build_min_nt_call_vec (ovl_op_identifier (ARRAY_REF),
orig_index_exp_list);
release_tree_vector (orig_index_exp_list);
}
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 (location_t loc, tree exp, tree size, bool doing_vec,
int use_global_delete, tsubst_flags_t complain)
{
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;
SET_EXPR_LOCATION (t, loc);
return t;
}
location_t exp_loc = cp_expr_loc_or_loc (exp, loc);
/* An array can't have been allocated by new, so complain. */
if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
&& (complain & tf_warning))
warning_at (exp_loc, 0, "deleting array %q#E", exp);
t = build_expr_type_conversion (WANT_POINTER, exp, true);
if (t == NULL_TREE || t == error_mark_node)
{
if (complain & tf_error)
error_at (exp_loc,
"type %q#T argument given to %, 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)
{
if (complain & tf_error)
error_at (exp_loc,
"cannot delete a function. Only pointer-to-objects are "
"valid arguments to %");
return error_mark_node;
}
/* Deleting ptr to void is undefined behavior [expr.delete/3]. */
if (VOID_TYPE_P (TREE_TYPE (type)))
{
if (complain & tf_warning)
warning_at (exp_loc, OPT_Wdelete_incomplete,
"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_loc (loc, NOP_EXPR, void_type_node, t);
if (doing_vec)
return build_vec_delete (loc, t, /*maxindex=*/NULL_TREE,
sfk_deleting_destructor,
use_global_delete, complain);
else
return build_delete (loc, type, t, sfk_deleting_destructor,
LOOKUP_NORMAL, use_global_delete,
complain);
}
/* 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
|| DECL_ALIAS_TEMPLATE_P (tmpl)
|| (TREE_CODE (decl) == TYPE_DECL
&& MAYBE_CLASS_TYPE_P (TREE_TYPE (decl))))
{
/* The parser rejects template declarations in local classes
(with the exception of generic lambdas). */
gcc_assert (!current_function_decl || LAMBDA_FUNCTION_P (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 if (variable_template_p (tmpl))
/* OK */;
else
error ("template declaration of %q#D", decl);
}
/* Sanity check: report error if this function FUNCTION is not
really a member of the class (CTYPE) it is supposed to belong to.
TEMPLATE_PARMS is used to specify the template parameters of a member
template passed as FUNCTION_DECL. If the member template is passed as a
TEMPLATE_DECL, it can be NULL since the parameters can be extracted
from the declaration. If the function is not a function template, it
must be NULL.
It returns the original declaration for the function, NULL_TREE if
no declaration was found, error_mark_node if an error was emitted. */
tree
check_classfn (tree ctype, tree function, tree template_parms)
{
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 void f(T); };
template <> void S::f(int);
we're not going to find `S::f(int)', but there's no
reason we should, either. We let our callers know we didn't
find the method, but we don't complain. */
return NULL_TREE;
/* Basic sanity check: for a template function, the template parameters
either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
if (TREE_CODE (function) == TEMPLATE_DECL)
{
if (template_parms
&& !comp_template_parms (template_parms,
DECL_TEMPLATE_PARMS (function)))
{
error ("template parameter lists provided don%'t match the "
"template parameters of %qD", function);
return error_mark_node;
}
template_parms = DECL_TEMPLATE_PARMS (function);
}
/* OK, is this a definition of a member template? */
bool is_template = (template_parms != NULL_TREE);
/* [temp.mem]
A destructor shall not be a member template. */
if (DECL_DESTRUCTOR_P (function) && is_template)
{
error ("destructor %qD declared as member template", function);
return error_mark_node;
}
/* 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. */
tree pushed_scope = push_scope (ctype);
tree matched = NULL_TREE;
tree fns = get_class_binding (ctype, DECL_NAME (function));
bool saw_template = false;
for (ovl_iterator iter (fns); !matched && iter; ++iter)
{
tree fndecl = *iter;
if (TREE_CODE (fndecl) == TEMPLATE_DECL)
saw_template = true;
/* A member template definition only matches a member template
declaration. */
if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
continue;
if (!DECL_DECLARES_FUNCTION_P (fndecl))
continue;
tree p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
tree 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);
/* ref-qualifier or absence of same must match. */
if (type_memfn_rqual (TREE_TYPE (function))
!= type_memfn_rqual (TREE_TYPE (fndecl)))
continue;
// Include constraints in the match.
tree c1 = get_constraints (function);
tree c2 = get_constraints (fndecl);
/* While finding a match, same types and params are not enough
if the function is versioned. Also check version ("target")
attributes. */
if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
TREE_TYPE (TREE_TYPE (fndecl)))
&& compparms (p1, p2)
&& !targetm.target_option.function_versions (function, fndecl)
&& (!is_template
|| comp_template_parms (template_parms,
DECL_TEMPLATE_PARMS (fndecl)))
&& equivalent_constraints (c1, c2)
&& (DECL_TEMPLATE_SPECIALIZATION (function)
== DECL_TEMPLATE_SPECIALIZATION (fndecl))
&& (!DECL_TEMPLATE_SPECIALIZATION (function)
|| (DECL_TI_TEMPLATE (function) == DECL_TI_TEMPLATE (fndecl))))
matched = fndecl;
}
if (!matched && !is_template && saw_template
&& !processing_template_decl && DECL_UNIQUE_FRIEND_P (function))
{
/* "[if no non-template match is found,] each remaining function template
is replaced with the specialization chosen by deduction from the
friend declaration or discarded if deduction fails."
So tell check_explicit_specialization to look for a match. */
SET_DECL_IMPLICIT_INSTANTIATION (function);
matched = function;
}
if (!matched)
{
if (!COMPLETE_TYPE_P (ctype))
cxx_incomplete_type_error (DECL_SOURCE_LOCATION (function),
function, ctype);
else
{
if (DECL_CONV_FN_P (function))
fns = get_class_binding (ctype, conv_op_identifier);
error_at (DECL_SOURCE_LOCATION (function),
"no declaration matches %q#D", function);
if (fns)
print_candidates (fns);
else if (DECL_CONV_FN_P (function))
inform (DECL_SOURCE_LOCATION (function),
"no conversion operators declared");
else
inform (DECL_SOURCE_LOCATION (function),
"no functions named %qD", function);
inform (DECL_SOURCE_LOCATION (TYPE_NAME (ctype)),
"%#qT defined here", ctype);
}
matched = error_mark_node;
}
if (pushed_scope)
pop_scope (pushed_scope);
return matched;
}
/* 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 (processing_template_decl)
return;
DECL_DEFER_OUTPUT (decl) = 1;
vec_safe_push (deferred_fns, decl);
}
/* As above, but for variable template instantiations. */
void
note_variable_template_instantiation (tree decl)
{
vec_safe_push (pending_statics, 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)
{
if (DECL_TEMPLATE_INSTANTIATED (decl))
/* We already needed to instantiate this, so the processing in this
function is unnecessary/wrong. */
return;
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 (pending_statics, decl);
if (LOCAL_CLASS_P (current_class_type)
/* We already complained about the template definition. */
&& !DECL_TEMPLATE_INSTANTIATION (decl))
permerror (DECL_SOURCE_LOCATION (decl),
"local class %q#T shall not have static data member %q#D",
current_class_type, decl);
else
for (tree t = current_class_type; TYPE_P (t);
t = CP_TYPE_CONTEXT (t))
if (TYPE_UNNAMED_P (t))
{
auto_diagnostic_group d;
if (permerror (DECL_SOURCE_LOCATION (decl),
"static data member %qD in unnamed class", decl))
inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)),
"unnamed class defined here");
break;
}
if (DECL_INLINE_VAR_P (decl) && !DECL_TEMPLATE_INSTANTIATION (decl))
/* An inline variable is immediately defined, so don't set DECL_IN_AGGR_P.
Except that if decl is a template instantiation, it isn't defined until
instantiate_decl. */;
else
DECL_IN_AGGR_P (decl) = 1;
if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
&& TYPE_DOMAIN (TREE_TYPE (decl)) == NULL_TREE)
SET_VAR_HAD_UNKNOWN_BOUND (decl);
if (init)
{
/* Similarly to start_decl_1, we want to complete the type in order
to do the right thing in cp_apply_type_quals_to_decl, possibly
clear TYPE_QUAL_CONST (c++/65579). */
tree type = TREE_TYPE (decl) = complete_type (TREE_TYPE (decl));
cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
}
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;
if (init
&& TREE_CODE (init) == TREE_LIST
&& TREE_VALUE (init) == error_mark_node
&& TREE_CHAIN (init) == NULL_TREE)
init = NULL_TREE;
int initialized;
if (init == ridpointers[(int)RID_DELETE])
initialized = SD_DELETED;
else if (init == ridpointers[(int)RID_DEFAULT])
initialized = SD_DEFAULTED;
else if (init)
initialized = SD_INITIALIZED;
else
initialized = SD_UNINITIALIZED;
value = grokdeclarator (declarator, declspecs, FIELD, initialized, &attrlist);
if (! value || value == error_mark_node)
/* friend or constructor went bad. */
return error_mark_node;
if (TREE_TYPE (value) == error_mark_node)
return value;
if (TREE_CODE (value) == TYPE_DECL && init)
{
error_at (cp_expr_loc_or_loc (init, DECL_SOURCE_LOCATION (value)),
"typedef %qD is initialized (use %qs instead)",
value, "decltype");
init = NULL_TREE;
}
/* Pass friendly classes back. */
if (value == void_type_node)
return value;
if (DECL_NAME (value)
&& TREE_CODE (DECL_NAME (value)) == TEMPLATE_ID_EXPR)
{
error_at (declarator->id_loc,
"explicit template argument list not allowed");
return error_mark_node;
}
/* Stash away type declarations. */
if (TREE_CODE (value) == TYPE_DECL)
{
DECL_NONLOCAL (value) = 1;
DECL_CONTEXT (value) = current_class_type;
if (attrlist)
{
int attrflags = 0;
/* If this is a typedef that names the class for linkage purposes
(7.1.3p8), apply any attributes directly to the type. */
if (OVERLOAD_TYPE_P (TREE_TYPE (value))
&& value == TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))))
attrflags = ATTR_FLAG_TYPE_IN_PLACE;
cplus_decl_attributes (&value, attrlist, attrflags);
}
if (decl_spec_seq_has_spec_p (declspecs, ds_typedef)
&& TREE_TYPE (value) != error_mark_node
&& TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value))) != value)
set_underlying_type (value);
/* It's important that push_template_decl below follows
set_underlying_type above so that the created template
carries the properly set type of VALUE. */
if (processing_template_decl)
value = push_template_decl (value);
record_locally_defined_typedef (value);
return value;
}
int friendp = decl_spec_seq_has_spec_p (declspecs, ds_friend);
if (!friendp && 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)
{
if (init == ridpointers[(int)RID_DELETE])
{
DECL_DELETED_FN (value) = 1;
DECL_DECLARED_INLINE_P (value) = 1;
}
else if (init == ridpointers[(int)RID_DEFAULT])
{
if (defaultable_fn_check (value))
{
DECL_DEFAULTED_FN (value) = 1;
DECL_INITIALIZED_IN_CLASS_P (value) = 1;
DECL_DECLARED_INLINE_P (value) = 1;
/* grokfndecl set this to error_mark_node, but we want to
leave it unset until synthesize_method. */
DECL_INITIAL (value) = NULL_TREE;
}
}
else if (TREE_CODE (init) == DEFERRED_PARSE)
error ("invalid initializer for member function %qD", value);
else if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
{
if (integer_zerop (init))
DECL_PURE_VIRTUAL_P (value) = 1;
else if (error_operand_p (init))
; /* An error has already been reported. */
else
error ("invalid initializer for member function %qD",
value);
}
else
{
gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
location_t iloc
= cp_expr_loc_or_loc (init, DECL_SOURCE_LOCATION (value));
if (friendp)
error_at (iloc, "initializer specified for friend "
"function %qD", value);
else
error_at (iloc, "initializer specified for static "
"member function %qD", value);
}
}
else if (TREE_CODE (value) == FIELD_DECL)
/* C++11 NSDMI, keep going. */;
else if (!VAR_P (value))
gcc_unreachable ();
}
/* Pass friend decls back. */
if ((TREE_CODE (value) == FUNCTION_DECL
|| TREE_CODE (value) == TEMPLATE_DECL)
&& DECL_CONTEXT (value) != current_class_type)
{
if (attrlist)
cplus_decl_attributes (&value, attrlist, 0);
return value;
}
/* Need to set this before push_template_decl. */
if (VAR_P (value))
DECL_CONTEXT (value) = current_class_type;
if (processing_template_decl && VAR_OR_FUNCTION_DECL_P (value))
{
value = push_template_decl (value);
if (error_operand_p (value))
return error_mark_node;
}
if (attrlist)
cplus_decl_attributes (&value, attrlist, 0);
if (init && DIRECT_LIST_INIT_P (init))
flags = LOOKUP_NORMAL;
else
flags = LOOKUP_IMPLICIT;
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 ("% 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_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_UNIQUE_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 the width of the bitfield, a constant expression.
The other parameters are as for grokfield. */
tree
grokbitfield (const cp_declarator *declarator,
cp_decl_specifier_seq *declspecs, tree width, tree init,
tree attrlist)
{
tree value = grokdeclarator (declarator, declspecs, BITFIELD,
init != NULL_TREE, &attrlist);
if (value == error_mark_node)
return NULL_TREE; /* friends went bad. */
tree type = TREE_TYPE (value);
if (type == error_mark_node)
return value;
/* Pass friendly classes back. */
if (VOID_TYPE_P (value))
return void_type_node;
if (!INTEGRAL_OR_ENUMERATION_TYPE_P (type)
&& (INDIRECT_TYPE_P (type) || !dependent_type_p (type)))
{
error_at (DECL_SOURCE_LOCATION (value),
"bit-field %qD with non-integral type %qT",
value, type);
return error_mark_node;
}
if (TREE_CODE (value) == TYPE_DECL)
{
error_at (DECL_SOURCE_LOCATION (value),
"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_at (DECL_SOURCE_LOCATION (value),
"cannot declare bit-field %qD with function type", value);
return NULL_TREE;
}
if (TYPE_WARN_IF_NOT_ALIGN (type))
{
error_at (DECL_SOURCE_LOCATION (value), "cannot declare bit-field "
"%qD with % type", 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_at (DECL_SOURCE_LOCATION (value),
"static member %qD cannot be a bit-field", value);
return NULL_TREE;
}
int flags = LOOKUP_IMPLICIT;
if (init && DIRECT_LIST_INIT_P (init))
flags = LOOKUP_NORMAL;
cp_finish_decl (value, init, false, NULL_TREE, flags);
if (width != error_mark_node)
{
/* The width must be an integer type. */
if (!type_dependent_expression_p (width)
&& !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width)))
error ("width of bit-field %qD has non-integral type %qT", value,
TREE_TYPE (width));
else if (!check_for_bare_parameter_packs (width))
{
/* Temporarily stash the width in DECL_BIT_FIELD_REPRESENTATIVE.
check_bitfield_decl picks it from there later and sets DECL_SIZE
accordingly. */
DECL_BIT_FIELD_REPRESENTATIVE (value) = width;
SET_DECL_C_BIT_FIELD (value);
}
}
DECL_IN_AGGR_P (value) = 1;
if (attrlist)
cplus_decl_attributes (&value, attrlist, /*flags=*/0);
return value;
}
/* Returns true iff ATTR is an attribute which needs to be applied at
instantiation time rather than template definition time. */
static bool
is_late_template_attribute (tree attr, tree decl)
{
tree name = get_attribute_name (attr);
tree args = TREE_VALUE (attr);
const struct attribute_spec *spec = lookup_attribute_spec (name);
tree arg;
if (!spec)
/* Unknown attribute. */
return false;
/* Attribute weak handling wants to write out assembly right away. */
if (is_attribute_p ("weak", name))
return true;
/* Attributes used and unused are applied directly to typedefs for the
benefit of maybe_warn_unused_local_typedefs. */
if (TREE_CODE (decl) == TYPE_DECL
&& (is_attribute_p ("unused", name)
|| is_attribute_p ("used", name)))
return false;
/* Attribute tls_model wants to modify the symtab. */
if (is_attribute_p ("tls_model", name))
return true;
/* #pragma omp declare simd attribute needs to be always deferred. */
if (flag_openmp
&& is_attribute_p ("omp declare simd", name))
return true;
if (args == error_mark_node)
return false;
/* An attribute pack is clearly dependent. */
if (args && PACK_EXPANSION_P (args))
return true;
/* If any of the arguments are dependent expressions, we can't evaluate
the attribute until instantiation time. */
for (arg = args; arg; arg = TREE_CHAIN (arg))
{
tree t = TREE_VALUE (arg);
/* If the first attribute argument is an identifier, only consider
second and following arguments. Attributes like mode, format,
cleanup and several target specific attributes aren't late
just because they have an IDENTIFIER_NODE as first argument. */
if (arg == args && attribute_takes_identifier_p (name)
&& identifier_p (t))
continue;
if (value_dependent_expression_p (t))
return true;
}
if (TREE_CODE (decl) == TYPE_DECL
|| TYPE_P (decl)
|| spec->type_required)
{
tree type = TYPE_P (decl) ? decl : TREE_TYPE (decl);
if (!type)
return true;
/* We can't apply any attributes to a completely unknown type until
instantiation time. */
enum tree_code code = TREE_CODE (type);
if (code == TEMPLATE_TYPE_PARM
|| code == BOUND_TEMPLATE_TEMPLATE_PARM
|| code == TYPENAME_TYPE)
return true;
/* Also defer most attributes on dependent types. This is not
necessary in all cases, but is the better default. */
else if (dependent_type_p (type)
/* But some attributes specifically apply to templates. */
&& !is_attribute_p ("abi_tag", name)
&& !is_attribute_p ("deprecated", name)
&& !is_attribute_p ("unavailable", name)
&& !is_attribute_p ("visibility", name))
return true;
else
return false;
}
else
return false;
}
/* ATTR_P is a list of attributes. Remove any attributes which need to be
applied at instantiation time and return them. If IS_DEPENDENT is true,
the declaration itself is dependent, so all attributes should be applied
at instantiation time. */
tree
splice_template_attributes (tree *attr_p, tree decl)
{
tree *p = attr_p;
tree late_attrs = NULL_TREE;
tree *q = &late_attrs;
if (!p || *p == error_mark_node)
return NULL_TREE;
for (; *p; )
{
if (is_late_template_attribute (*p, decl))
{
ATTR_IS_DEPENDENT (*p) = 1;
*q = *p;
*p = TREE_CHAIN (*p);
q = &TREE_CHAIN (*q);
*q = NULL_TREE;
}
else
p = &TREE_CHAIN (*p);
}
return late_attrs;
}
/* Attach any LATE_ATTRS to DECL_P, after the non-dependent attributes have
been applied by a previous call to decl_attributes. */
static void
save_template_attributes (tree late_attrs, tree *decl_p, int flags)
{
tree *q;
if (!late_attrs)
return;
if (DECL_P (*decl_p))
q = &DECL_ATTRIBUTES (*decl_p);
else
q = &TYPE_ATTRIBUTES (*decl_p);
tree old_attrs = *q;
/* Place the late attributes at the beginning of the attribute
list. */
late_attrs = chainon (late_attrs, *q);
if (*q != late_attrs
&& !DECL_P (*decl_p)
&& !(flags & ATTR_FLAG_TYPE_IN_PLACE))
{
if (!dependent_type_p (*decl_p))
*decl_p = cp_build_type_attribute_variant (*decl_p, late_attrs);
else
{
*decl_p = build_variant_type_copy (*decl_p);
TYPE_ATTRIBUTES (*decl_p) = late_attrs;
}
}
else
*q = late_attrs;
if (!DECL_P (*decl_p) && *decl_p == TYPE_MAIN_VARIANT (*decl_p))
{
/* We've added new attributes directly to the main variant, so
now we need to update all of the other variants to include
these new attributes. */
tree variant;
for (variant = TYPE_NEXT_VARIANT (*decl_p); variant;
variant = TYPE_NEXT_VARIANT (variant))
{
gcc_assert (TYPE_ATTRIBUTES (variant) == old_attrs);
TYPE_ATTRIBUTES (variant) = TYPE_ATTRIBUTES (*decl_p);
}
}
}
/* True if ATTRS contains any dependent attributes that affect type
identity. */
bool
any_dependent_type_attributes_p (tree attrs)
{
for (tree a = attrs; a; a = TREE_CHAIN (a))
if (ATTR_IS_DEPENDENT (a))
{
const attribute_spec *as = lookup_attribute_spec (TREE_PURPOSE (a));
if (as && as->affects_type_identity)
return true;
}
return false;
}
/* Return true iff ATTRS are acceptable attributes to be applied in-place
to a typedef which gives a previously unnamed class or enum a name for
linkage purposes. */
bool
attributes_naming_typedef_ok (tree attrs)
{
for (; attrs; attrs = TREE_CHAIN (attrs))
{
tree name = get_attribute_name (attrs);
if (is_attribute_p ("vector_size", name))
return false;
}
return true;
}
/* Like reconstruct_complex_type, but handle also template trees. */
tree
cp_reconstruct_complex_type (tree type, tree bottom)
{
tree inner, outer;
if (TYPE_PTR_P (type))
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
TYPE_REF_CAN_ALIAS_ALL (type));
}
else if (TYPE_REF_P (type))
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
TYPE_REF_CAN_ALIAS_ALL (type));
}
else if (TREE_CODE (type) == ARRAY_TYPE)
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
outer = build_cplus_array_type (inner, TYPE_DOMAIN (type));
/* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
element type qualification will be handled by the recursive
cp_reconstruct_complex_type call and cp_build_qualified_type
for ARRAY_TYPEs changes the element type. */
return outer;
}
else if (TREE_CODE (type) == FUNCTION_TYPE)
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
outer = build_function_type (inner, TYPE_ARG_TYPES (type));
outer = apply_memfn_quals (outer, type_memfn_quals (type));
}
else if (TREE_CODE (type) == METHOD_TYPE)
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
/* The build_method_type_directly() routine prepends 'this' to argument list,
so we must compensate by getting rid of it. */
outer
= build_method_type_directly
(class_of_this_parm (type), inner,
TREE_CHAIN (TYPE_ARG_TYPES (type)));
}
else if (TREE_CODE (type) == OFFSET_TYPE)
{
inner = cp_reconstruct_complex_type (TREE_TYPE (type), bottom);
outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
}
else
return bottom;
if (TYPE_ATTRIBUTES (type))
outer = cp_build_type_attribute_variant (outer, TYPE_ATTRIBUTES (type));
outer = cp_build_qualified_type (outer, cp_type_quals (type));
outer = cxx_copy_lang_qualifiers (outer, type);
return outer;
}
/* Replaces any constexpr expression that may be into the attributes
arguments with their reduced value. */
void
cp_check_const_attributes (tree attributes)
{
if (attributes == error_mark_node)
return;
tree attr;
for (attr = attributes; attr; attr = TREE_CHAIN (attr))
{
tree arg;
/* As we implement alignas using gnu::aligned attribute and
alignas argument is a constant expression, force manifestly
constant evaluation of aligned attribute argument. */
bool manifestly_const_eval
= is_attribute_p ("aligned", get_attribute_name (attr));
for (arg = TREE_VALUE (attr); arg && TREE_CODE (arg) == TREE_LIST;
arg = TREE_CHAIN (arg))
{
tree expr = TREE_VALUE (arg);
if (EXPR_P (expr))
TREE_VALUE (arg)
= fold_non_dependent_expr (expr, tf_warning_or_error,
manifestly_const_eval);
}
}
}
/* Return the last pushed declaration for the symbol DECL or NULL
when no such declaration exists. */
static tree
find_last_decl (tree decl)
{
tree last_decl = NULL_TREE;
if (tree name = DECL_P (decl) ? DECL_NAME (decl) : NULL_TREE)
{
/* Look up the declaration in its scope. */
tree pushed_scope = NULL_TREE;
if (tree ctype = DECL_CONTEXT (decl))
pushed_scope = push_scope (ctype);
last_decl = lookup_name (name);
if (pushed_scope)
pop_scope (pushed_scope);
/* The declaration may be a member conversion operator
or a bunch of overfloads (handle the latter below). */
if (last_decl && BASELINK_P (last_decl))
last_decl = BASELINK_FUNCTIONS (last_decl);
}
if (!last_decl)
return NULL_TREE;
if (DECL_P (last_decl) || TREE_CODE (last_decl) == OVERLOAD)
{
/* A set of overloads of the same function. */
for (lkp_iterator iter (last_decl); iter; ++iter)
{
if (TREE_CODE (*iter) == OVERLOAD)
continue;
tree d = *iter;
/* We can't compare versions in the middle of processing the
attribute that has the version. */
if (TREE_CODE (d) == FUNCTION_DECL
&& DECL_FUNCTION_VERSIONED (d))
return NULL_TREE;
if (decls_match (decl, d, /*record_decls=*/false))
return d;
}
return NULL_TREE;
}
return NULL_TREE;
}
/* Like decl_attributes, but handle C++ complexity. */
void
cplus_decl_attributes (tree *decl, tree attributes, int flags)
{
if (*decl == NULL_TREE || *decl == void_type_node
|| *decl == error_mark_node || attributes == error_mark_node)
return;
/* Add implicit "omp declare target" attribute if requested. */
if (vec_safe_length (scope_chain->omp_declare_target_attribute)
&& ((VAR_P (*decl)
&& (TREE_STATIC (*decl) || DECL_EXTERNAL (*decl)))
|| TREE_CODE (*decl) == FUNCTION_DECL))
{
if (VAR_P (*decl)
&& DECL_CLASS_SCOPE_P (*decl))
error ("%q+D static data member inside of declare target directive",
*decl);
else
{
if (VAR_P (*decl)
&& (processing_template_decl
|| !omp_mappable_type (TREE_TYPE (*decl))))
attributes
= tree_cons (get_identifier ("omp declare target implicit"),
NULL_TREE, attributes);
else
{
attributes = tree_cons (get_identifier ("omp declare target"),
NULL_TREE, attributes);
attributes
= tree_cons (get_identifier ("omp declare target block"),
NULL_TREE, attributes);
}
if (TREE_CODE (*decl) == FUNCTION_DECL)
{
cp_omp_declare_target_attr &last
= scope_chain->omp_declare_target_attribute->last ();
int device_type = MAX (last.device_type, 0);
if ((device_type & OMP_CLAUSE_DEVICE_TYPE_HOST) != 0
&& !lookup_attribute ("omp declare target host",
attributes))
attributes
= tree_cons (get_identifier ("omp declare target host"),
NULL_TREE, attributes);
if ((device_type & OMP_CLAUSE_DEVICE_TYPE_NOHOST) != 0
&& !lookup_attribute ("omp declare target nohost",
attributes))
attributes
= tree_cons (get_identifier ("omp declare target nohost"),
NULL_TREE, attributes);
}
}
}
tree late_attrs = NULL_TREE;
if (processing_template_decl)
{
if (check_for_bare_parameter_packs (attributes))
return;
late_attrs = splice_template_attributes (&attributes, *decl);
}
cp_check_const_attributes (attributes);
if (flag_openmp || flag_openmp_simd)
{
bool diagnosed = false;
for (tree *pa = &attributes; *pa; )
{
if (get_attribute_namespace (*pa) == omp_identifier)
{
tree name = get_attribute_name (*pa);
if (is_attribute_p ("directive", name)
|| is_attribute_p ("sequence", name))
{
if (!diagnosed)
{
error ("% not allowed to be specified in this "
"context", name);
diagnosed = true;
}
*pa = TREE_CHAIN (*pa);
continue;
}
}
pa = &TREE_CHAIN (*pa);
}
}
if (TREE_CODE (*decl) == TEMPLATE_DECL)
decl = &DECL_TEMPLATE_RESULT (*decl);
if (TREE_TYPE (*decl) && TYPE_PTRMEMFUNC_P (TREE_TYPE (*decl)))
{
attributes
= decl_attributes (decl, attributes, flags | ATTR_FLAG_FUNCTION_NEXT);
decl_attributes (&TYPE_PTRMEMFUNC_FN_TYPE_RAW (TREE_TYPE (*decl)),
attributes, flags);
}
else
{
tree last_decl = find_last_decl (*decl);
decl_attributes (decl, attributes, flags, last_decl);
}
if (late_attrs)
save_template_attributes (late_attrs, decl, flags);
/* Propagate deprecation out to the template. */
if (TREE_DEPRECATED (*decl))
if (tree ti = get_template_info (*decl))
{
tree tmpl = TI_TEMPLATE (ti);
tree pattern = (TYPE_P (*decl) ? TREE_TYPE (tmpl)
: DECL_TEMPLATE_RESULT (tmpl));
if (*decl == pattern)
TREE_DEPRECATED (tmpl) = true;
}
/* Likewise, propagate unavailability out to the template. */
if (TREE_UNAVAILABLE (*decl))
if (tree ti = get_template_info (*decl))
{
tree tmpl = TI_TEMPLATE (ti);
tree pattern = (TYPE_P (*decl) ? TREE_TYPE (tmpl)
: DECL_TEMPLATE_RESULT (tmpl));
if (*decl == pattern)
TREE_UNAVAILABLE (tmpl) = true;
}
}
/* 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_at (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
"anonymous struct not inside named type");
return error_mark_node;
}
for (field = TYPE_FIELDS (type);
field != NULL_TREE;
field = DECL_CHAIN (field))
{
tree decl;
tree ref;
if (DECL_ARTIFICIAL (field))
continue;
if (TREE_CODE (field) != FIELD_DECL)
{
permerror (DECL_SOURCE_LOCATION (field),
"%q#D invalid; an anonymous union can only "
"have non-static data members", field);
continue;
}
if (TREE_PRIVATE (field))
permerror (DECL_SOURCE_LOCATION (field),
"private member %q#D in anonymous union", field);
else if (TREE_PROTECTED (field))
permerror (DECL_SOURCE_LOCATION (field),
"protected member %q#D in anonymous union", field);
if (processing_template_decl)
ref = build_min_nt_loc (UNKNOWN_LOCATION, COMPONENT_REF, object,
DECL_NAME (field), NULL_TREE);
else
ref = build_class_member_access_expr (object, field, NULL_TREE,
false, tf_warning_or_error);
if (DECL_NAME (field))
{
tree base;
decl = build_decl (input_location,
VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
DECL_ANON_UNION_VAR_P (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
base = get_base_address (object);
TREE_PUBLIC (decl) = TREE_PUBLIC (base);
TREE_STATIC (decl) = TREE_STATIC (base);
DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
SET_DECL_VALUE_EXPR (decl, ref);
DECL_HAS_VALUE_EXPR_P (decl) = 1;
decl = pushdecl (decl);
}
else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
decl = build_anon_union_vars (TREE_TYPE (field), ref);
else
decl = 0;
if (main_decl == NULL_TREE)
main_decl = decl;
}
return main_decl;
}
/* Finish off the processing of a UNION_TYPE structure. If the union is an
anonymous union, then all members must be laid out together. PUBLIC_P
is nonzero if this union is not declared static. */
void
finish_anon_union (tree anon_union_decl)
{
tree type;
tree main_decl;
bool public_p;
if (anon_union_decl == error_mark_node)
return;
type = TREE_TYPE (anon_union_decl);
public_p = TREE_PUBLIC (anon_union_decl);
/* The VAR_DECL's context is the same as the TYPE's context. */
DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
if (TYPE_FIELDS (type) == NULL_TREE)
return;
if (public_p)
{
error ("namespace-scope anonymous aggregates must be static");
return;
}
main_decl = build_anon_union_vars (type, anon_union_decl);
if (main_decl == error_mark_node)
return;
if (main_decl == NULL_TREE)
{
pedwarn (input_location, 0, "anonymous union with no members");
return;
}
if (!processing_template_decl)
{
/* Use main_decl to set the mangled name. */
DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
maybe_commonize_var (anon_union_decl);
if (TREE_STATIC (anon_union_decl) || DECL_EXTERNAL (anon_union_decl))
{
if (DECL_DISCRIMINATOR_P (anon_union_decl))
determine_local_discriminator (anon_union_decl);
mangle_decl (anon_union_decl);
}
DECL_NAME (anon_union_decl) = NULL_TREE;
}
pushdecl (anon_union_decl);
cp_finish_decl (anon_union_decl, NULL_TREE, false, NULL_TREE, 0);
}
/* 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, location_t loc)
{
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_at (loc, "% must return type %qT",
ptr_type_node);
}
if (args && args != void_list_node)
{
if (TREE_PURPOSE (args))
{
/* [basic.stc.dynamic.allocation]
The first parameter shall not have an associated default
argument. */
error_at (loc, "the first parameter of % cannot "
"have a default argument");
/* Throw away the default argument. */
TREE_PURPOSE (args) = NULL_TREE;
}
if (!same_type_p (TREE_VALUE (args), size_type_node))
{
e = 2;
args = TREE_CHAIN (args);
}
}
else
e = 2;
if (e == 2)
permerror (loc, "% takes type % (%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 = (cxx_copy_lang_qualifiers
(build_function_type (ptr_type_node, args),
type));
/* Fall through. */
default:;
}
return type;
}
void
coerce_delete_type (tree decl, location_t loc)
{
int e = 0;
tree type = TREE_TYPE (decl);
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_at (loc, "% must return type %qT",
void_type_node);
}
tree ptrtype = ptr_type_node;
if (destroying_delete_p (decl))
{
if (DECL_CLASS_SCOPE_P (decl))
/* If the function is a destroying operator delete declared in class
type C, the type of its first parameter shall be C*. */
ptrtype = build_pointer_type (DECL_CONTEXT (decl));
else
/* A destroying operator delete shall be a class member function named
operator delete. */
error_at (loc,
"destroying % must be a member function");
const ovl_op_info_t *op = IDENTIFIER_OVL_OP_INFO (DECL_NAME (decl));
if (op->flags & OVL_OP_FLAG_VEC)
error_at (loc, "% cannot be a destroying delete");
if (!usual_deallocation_fn_p (decl))
error_at (loc, "destroying % must be a usual "
"deallocation function");
}
if (!args || args == void_list_node
|| !same_type_p (TREE_VALUE (args), ptrtype))
{
e = 2;
if (args && args != void_list_node)
args = TREE_CHAIN (args);
error_at (loc, "% takes type %qT as first parameter",
ptrtype);
}
switch (e)
{
case 2:
args = tree_cons (NULL_TREE, ptrtype, args);
/* Fall through. */
case 1:
type = (cxx_copy_lang_qualifiers
(build_function_type (void_type_node, args),
type));
/* Fall through. */
default:;
}
TREE_TYPE (decl) = type;
}
/* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
and mark them as needed. */
static void
mark_vtable_entries (tree decl, vec &consteval_vtables)
{
/* It's OK for the vtable to refer to deprecated virtual functions. */
warning_sentinel w(warn_deprecated_decl);
bool consteval_seen = false;
for (auto &e: CONSTRUCTOR_ELTS (DECL_INITIAL (decl)))
{
tree fnaddr = e.value;
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;
tree fn = TREE_OPERAND (fnaddr, 0);
if (TREE_CODE (fn) == FUNCTION_DECL && DECL_IMMEDIATE_FUNCTION_P (fn))
{
if (!consteval_seen)
{
consteval_seen = true;
consteval_vtables.safe_push (decl);
}
continue;
}
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);
/* Set the location, as marking the function could cause
instantiation. We do not need to preserve the incoming
location, as we're called from c_parse_final_cleanups, which
takes care of that. */
input_location = DECL_SOURCE_LOCATION (fn);
mark_used (fn);
}
}
/* Replace any consteval functions in vtables with null pointers. */
static void
clear_consteval_vfns (vec &consteval_vtables)
{
for (tree vtable : consteval_vtables)
for (constructor_elt &elt : CONSTRUCTOR_ELTS (DECL_INITIAL (vtable)))
{
tree fn = cp_get_fndecl_from_callee (elt.value, /*fold*/false);
if (fn && DECL_IMMEDIATE_FUNCTION_P (fn))
elt.value = build_zero_cst (vtable_entry_type);
}
}
/* Adjust the TLS model on variable DECL if need be, typically after
the linkage of DECL has been modified. */
static void
adjust_var_decl_tls_model (tree decl)
{
if (CP_DECL_THREAD_LOCAL_P (decl)
&& !lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl)))
set_decl_tls_model (decl, decl_default_tls_model (decl));
}
/* Set DECL up to have the closest approximation of "initialized common"
linkage available. */
void
comdat_linkage (tree decl)
{
if (flag_weak)
make_decl_one_only (decl, cxx_comdat_group (decl));
else if (TREE_CODE (decl) == FUNCTION_DECL
|| (VAR_P (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 (TREE_PUBLIC (decl))
DECL_COMDAT (decl) = 1;
if (VAR_P (decl))
adjust_var_decl_tls_model (decl);
}
/* For win32 we also want to put explicit instantiations in
linkonce sections, so that they will be merged with implicit
instantiations; otherwise we get duplicate symbol errors.
For Darwin we do not want explicit instantiations to be
linkonce. */
void
maybe_make_one_only (tree decl)
{
/* We used to say that this was not necessary on targets that support weak
symbols, because the implicit instantiations will defer to the explicit
one. However, that's not actually the case in SVR4; a strong definition
after a weak one is an error. Also, not making explicit
instantiations one_only means that we can end up with two copies of
some template instantiations. */
if (! flag_weak)
return;
/* We can't set DECL_COMDAT on functions, or cp_finish_file will think
we can get away with not emitting them if they aren't used. We need
to for variables so that cp_finish_decl will update their linkage,
because their DECL_INITIAL may not have been set properly yet. */
if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
|| (! DECL_EXPLICIT_INSTANTIATION (decl)
&& ! DECL_TEMPLATE_SPECIALIZATION (decl)))
{
make_decl_one_only (decl, cxx_comdat_group (decl));
if (VAR_P (decl))
{
varpool_node *node = varpool_node::get_create (decl);
DECL_COMDAT (decl) = 1;
/* Mark it needed so we don't forget to emit it. */
node->forced_by_abi = true;
TREE_USED (decl) = 1;
adjust_var_decl_tls_model (decl);
}
}
}
/* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
This predicate will give the right answer during parsing of the
function, which other tests may not. */
bool
vague_linkage_p (tree decl)
{
if (!TREE_PUBLIC (decl))
{
/* maybe_thunk_body clears TREE_PUBLIC and DECL_ABSTRACT_P on the
maybe-in-charge 'tor variants; in that case we need to check one of
the "clones" for the real linkage. But only in that case; before
maybe_clone_body we haven't yet copied the linkage to the clones. */
if (DECL_MAYBE_IN_CHARGE_CDTOR_P (decl)
&& !DECL_ABSTRACT_P (decl)
&& DECL_CHAIN (decl)
&& DECL_CLONED_FUNCTION_P (DECL_CHAIN (decl)))
return vague_linkage_p (DECL_CHAIN (decl));
gcc_checking_assert (!DECL_COMDAT (decl));
return false;
}
/* Unfortunately, import_export_decl has not always been called
before the function is processed, so we cannot simply check
DECL_COMDAT. */
if (DECL_COMDAT (decl)
|| (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl))
|| (DECL_LANG_SPECIFIC (decl)
&& DECL_TEMPLATE_INSTANTIATION (decl))
|| (VAR_P (decl) && DECL_INLINE_VAR_P (decl)))
return true;
else if (DECL_FUNCTION_SCOPE_P (decl))
/* A local static in an inline effectively has vague linkage. */
return (TREE_STATIC (decl)
&& vague_linkage_p (DECL_CONTEXT (decl)));
else
return false;
}
/* 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 = -1;
else if (TYPE_POLYMORPHIC_P (ctype))
{
/* The ABI specifies that the virtual table and associated
information are emitted with the key method, if any. */
tree method = CLASSTYPE_KEY_METHOD (ctype);
/* If weak symbol support is not available, then we must be
careful not to emit the vtable when the key function is
inline. An inline function can be defined in multiple
translation units. If we were to emit the vtable in each
translation unit containing a definition, we would get
multiple definition errors at link-time. */
if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
}
/* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
a definition anywhere else. */
if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
import_export = 0;
/* Allow back ends the chance to overrule the decision. */
if (targetm.cxx.import_export_class)
import_export = targetm.cxx.import_export_class (ctype, import_export);
if (import_export)
{
SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
}
}
/* Return true if VAR has already been provided to the back end; in that
case VAR should not be modified further by the front end. */
static bool
var_finalized_p (tree var)
{
return varpool_node::get_create (var)->definition;
}
/* 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)
{
TREE_USED (decl) = 1;
if (TREE_CODE (decl) == FUNCTION_DECL)
{
/* Extern inline functions don't become needed when referenced.
If we know a method will be emitted in other TU and no new
functions can be marked reachable, just use the external
definition. */
struct cgraph_node *node = cgraph_node::get_create (decl);
node->forced_by_abi = true;
/* #pragma interface can call mark_needed for
maybe-in-charge 'tors; mark the clones as well. */
tree clone;
FOR_EACH_CLONE (clone, decl)
mark_needed (clone);
}
else if (VAR_P (decl))
{
varpool_node *node = varpool_node::get_create (decl);
/* C++ frontend use mark_decl_references to force COMDAT variables
to be output that might appear dead otherwise. */
node->forced_by_abi = true;
}
}
/* 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 (VAR_OR_FUNCTION_DECL_P (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/EXTERN should be
emitted; they may be referred to from other object files. */
if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_REALLY_EXTERN (decl))
return true;
/* Functions marked "dllexport" must be emitted so that they are
visible to other DLLs. */
if (flag_keep_inline_dllexport
&& lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl)))
return true;
/* When not optimizing, do not bother to produce definitions for extern
symbols. */
if (DECL_REALLY_EXTERN (decl)
&& ((TREE_CODE (decl) != FUNCTION_DECL
&& !optimize)
|| (TREE_CODE (decl) == FUNCTION_DECL
&& !opt_for_fn (decl, optimize)))
&& !lookup_attribute ("always_inline", decl))
return false;
/* 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))
return true;
/* Virtual functions might be needed for devirtualization. */
if (flag_devirtualize
&& TREE_CODE (decl) == FUNCTION_DECL
&& DECL_VIRTUAL_P (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, vec &consteval_vtables)
{
tree vtbl;
tree primary_vtbl;
int needed = 0;
varpool_node *current = NULL, *last = NULL;
/* 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 = DECL_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 = DECL_CHAIN (vtbl))
{
/* Mark entities references from the virtual table as used. */
mark_vtable_entries (vtbl, consteval_vtables);
if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
{
vec *cleanups = NULL;
tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl), &cleanups,
LOOKUP_NORMAL);
/* It had better be all done at compile-time. */
gcc_assert (!expr && !cleanups);
}
/* 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;
else if (DECL_ONE_ONLY (vtbl))
{
current = varpool_node::get_create (vtbl);
if (last)
current->add_to_same_comdat_group (last);
last = current;
}
}
/* For abstract classes, the destructor has been removed from the
vtable (in class.cc's build_vtbl_initializer). For a compiler-
generated destructor, it hence might not have been generated in
this translation unit - and with '#pragma interface' it might
never get generated. */
if (CLASSTYPE_PURE_VIRTUALS (ctype)
&& TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype)
&& !CLASSTYPE_LAZY_DESTRUCTOR (ctype)
&& DECL_DEFAULTED_IN_CLASS_P (CLASSTYPE_DESTRUCTOR (ctype)))
note_vague_linkage_fn (CLASSTYPE_DESTRUCTOR (ctype));
/* 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 };
static int expr_visibility (tree);
static int type_visibility (tree);
/* walk_tree helper function for type_visibility. */
static tree
min_vis_r (tree *tp, int *walk_subtrees, void *data)
{
int *vis_p = (int *)data;
int this_vis = VISIBILITY_DEFAULT;
if (! TYPE_P (*tp))
*walk_subtrees = 0;
else if (OVERLOAD_TYPE_P (*tp)
&& !TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
{
this_vis = VISIBILITY_ANON;
*walk_subtrees = 0;
}
else if (CLASS_TYPE_P (*tp))
{
this_vis = CLASSTYPE_VISIBILITY (*tp);
*walk_subtrees = 0;
}
else if (TREE_CODE (*tp) == ARRAY_TYPE
&& uses_template_parms (TYPE_DOMAIN (*tp)))
this_vis = expr_visibility (TYPE_MAX_VALUE (TYPE_DOMAIN (*tp)));
if (this_vis > *vis_p)
*vis_p = this_vis;
/* Tell cp_walk_subtrees to look through typedefs. */
if (*walk_subtrees == 1)
*walk_subtrees = 2;
return NULL;
}
/* walk_tree helper function for expr_visibility. */
static tree
min_vis_expr_r (tree *tp, int */*walk_subtrees*/, void *data)
{
int *vis_p = (int *)data;
int tpvis = VISIBILITY_DEFAULT;
switch (TREE_CODE (*tp))
{
case CAST_EXPR:
case IMPLICIT_CONV_EXPR:
case STATIC_CAST_EXPR:
case REINTERPRET_CAST_EXPR:
case CONST_CAST_EXPR:
case DYNAMIC_CAST_EXPR:
case NEW_EXPR:
case CONSTRUCTOR:
case LAMBDA_EXPR:
tpvis = type_visibility (TREE_TYPE (*tp));
break;
case VAR_DECL:
case FUNCTION_DECL:
if (! TREE_PUBLIC (*tp))
tpvis = VISIBILITY_ANON;
else
tpvis = DECL_VISIBILITY (*tp);
break;
default:
break;
}
if (tpvis > *vis_p)
*vis_p = tpvis;
return NULL_TREE;
}
/* Returns the visibility of TYPE, which is the minimum visibility of its
component types. */
static int
type_visibility (tree type)
{
int vis = VISIBILITY_DEFAULT;
cp_walk_tree_without_duplicates (&type, min_vis_r, &vis);
return vis;
}
/* Returns the visibility of an expression EXPR that appears in the signature
of a function template, which is the minimum visibility of names that appear
in its mangling. */
static int
expr_visibility (tree expr)
{
int vis = VISIBILITY_DEFAULT;
cp_walk_tree_without_duplicates (&expr, min_vis_expr_r, &vis);
return vis;
}
/* Limit the visibility of DECL to VISIBILITY, if not explicitly
specified (or if VISIBILITY is static). If TMPL is true, this
constraint is for a template argument, and takes precedence
over explicitly-specified visibility on the template. */
static void
constrain_visibility (tree decl, int visibility, bool tmpl)
{
if (visibility == VISIBILITY_ANON)
{
/* extern "C" declarations aren't affected by the anonymous
namespace. */
if (!DECL_EXTERN_C_P (decl))
{
TREE_PUBLIC (decl) = 0;
DECL_WEAK (decl) = 0;
DECL_COMMON (decl) = 0;
DECL_COMDAT (decl) = false;
if (VAR_OR_FUNCTION_DECL_P (decl))
{
struct symtab_node *snode = symtab_node::get (decl);
if (snode)
snode->set_comdat_group (NULL);
}
DECL_INTERFACE_KNOWN (decl) = 1;
if (DECL_LANG_SPECIFIC (decl))
DECL_NOT_REALLY_EXTERN (decl) = 1;
}
}
else if (visibility > DECL_VISIBILITY (decl)
&& (tmpl || !DECL_VISIBILITY_SPECIFIED (decl)))
{
DECL_VISIBILITY (decl) = (enum symbol_visibility) visibility;
/* This visibility was not specified. */
DECL_VISIBILITY_SPECIFIED (decl) = 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
vis = expr_visibility (arg);
if (vis)
constrain_visibility (decl, vis, true);
}
}
/* 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)
{
/* 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));
bool orig_visibility_specified = DECL_VISIBILITY_SPECIFIED (decl);
enum symbol_visibility orig_visibility = DECL_VISIBILITY (decl);
/* The decl may be a template instantiation, which could influence
visibilty. */
tree template_decl = NULL_TREE;
if (TREE_CODE (decl) == TYPE_DECL)
{
if (CLASS_TYPE_P (TREE_TYPE (decl)))
{
if (CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl)))
template_decl = decl;
}
else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
template_decl = decl;
}
else if (DECL_LANG_SPECIFIC (decl) && DECL_USE_TEMPLATE (decl))
template_decl = decl;
if (TREE_CODE (decl) == TYPE_DECL
&& LAMBDA_TYPE_P (TREE_TYPE (decl))
&& CLASSTYPE_LAMBDA_EXPR (TREE_TYPE (decl)) != error_mark_node)
if (tree extra = LAMBDA_TYPE_EXTRA_SCOPE (TREE_TYPE (decl)))
{
/* The lambda's visibility is limited by that of its extra
scope. */
int vis = 0;
if (TYPE_P (extra))
vis = type_visibility (extra);
else
vis = expr_visibility (extra);
constrain_visibility (decl, vis, false);
}
/* If DECL is a member of a class, visibility specifiers on the
class can influence the visibility of the DECL. */
tree class_type = NULL_TREE;
if (DECL_CLASS_SCOPE_P (decl))
class_type = DECL_CONTEXT (decl);
else
{
/* Not a class member. */
/* Virtual tables have DECL_CONTEXT set to their associated class,
so they are automatically handled above. */
gcc_assert (!VAR_P (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_VISIBILITY (decl) = DECL_VISIBILITY (fn);
DECL_VISIBILITY_SPECIFIED (decl) =
DECL_VISIBILITY_SPECIFIED (fn);
}
else
{
if (DECL_CLASS_SCOPE_P (fn))
determine_visibility_from_class (decl, DECL_CONTEXT (fn));
else if (determine_hidden_inline (fn))
{
DECL_VISIBILITY (decl) = default_visibility;
DECL_VISIBILITY_SPECIFIED (decl) =
visibility_options.inpragma;
}
else
{
DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
DECL_VISIBILITY_SPECIFIED (decl) =
DECL_VISIBILITY_SPECIFIED (fn);
}
}
/* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
but have no TEMPLATE_INFO, so don't try to check it. */
template_decl = NULL_TREE;
}
else if (VAR_P (decl) && DECL_TINFO_P (decl)
&& flag_visibility_ms_compat)
{
/* Under -fvisibility-ms-compat, types are visible by default,
even though their contents aren't. */
tree underlying_type = TREE_TYPE (DECL_NAME (decl));
int underlying_vis = type_visibility (underlying_type);
if (underlying_vis == VISIBILITY_ANON
|| (CLASS_TYPE_P (underlying_type)
&& CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type)))
constrain_visibility (decl, underlying_vis, false);
else
DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
}
else if (VAR_P (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))), false);
/* Give the target a chance to override the visibility associated
with DECL. */
if (TREE_PUBLIC (decl)
&& !DECL_REALLY_EXTERN (decl)
&& CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl)))
&& !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl))))
targetm.cxx.determine_class_data_visibility (decl);
}
else if (template_decl)
/* Template instantiations and specializations get visibility based
on their template unless they override it with an attribute. */;
else if (! DECL_VISIBILITY_SPECIFIED (decl))
{
if (determine_hidden_inline (decl))
DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
else
{
/* 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 (template_decl)
{
/* If the specialization doesn't specify visibility, use the
visibility from the template. */
tree tinfo = get_template_info (template_decl);
tree args = TI_ARGS (tinfo);
tree attribs = (TREE_CODE (decl) == TYPE_DECL
? TYPE_ATTRIBUTES (TREE_TYPE (decl))
: DECL_ATTRIBUTES (decl));
tree attr = lookup_attribute ("visibility", attribs);
if (args != error_mark_node)
{
tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
if (!DECL_VISIBILITY_SPECIFIED (decl))
{
if (!attr
&& determine_hidden_inline (decl))
DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
else
{
DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
DECL_VISIBILITY_SPECIFIED (decl)
= DECL_VISIBILITY_SPECIFIED (pattern);
}
}
if (args
/* Template argument visibility outweighs #pragma or namespace
visibility, but not an explicit attribute. */
&& !attr)
{
int depth = TMPL_ARGS_DEPTH (args);
if (DECL_VISIBILITY_SPECIFIED (decl))
{
/* A class template member with explicit visibility
overrides the class visibility, so we need to apply
all the levels of template args directly. */
int i;
for (i = 1; i <= depth; ++i)
{
tree lev = TMPL_ARGS_LEVEL (args, i);
constrain_visibility_for_template (decl, lev);
}
}
else if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (tinfo)))
/* 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_internal_context_p (decl))
/* Names in an anonymous namespace get internal linkage. */
constrain_visibility (decl, VISIBILITY_ANON, false);
else if (TREE_CODE (decl) != TYPE_DECL)
{
/* Propagate anonymity from type to decl. */
int tvis = type_visibility (TREE_TYPE (decl));
if (tvis == VISIBILITY_ANON
|| ! DECL_VISIBILITY_SPECIFIED (decl))
constrain_visibility (decl, tvis, false);
}
else if (no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/true))
/* DR 757: A type without linkage shall not be used as the type of a
variable or function with linkage, unless
o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
o the variable or function is not used (3.2 [basic.def.odr]) or is
defined in the same translation unit.
Since non-extern "C" decls need to be defined in the same
translation unit, we can make the type internal. */
constrain_visibility (decl, VISIBILITY_ANON, false);
/* If visibility changed and DECL already has DECL_RTL, ensure
symbol flags are updated. */
if ((DECL_VISIBILITY (decl) != orig_visibility
|| DECL_VISIBILITY_SPECIFIED (decl) != orig_visibility_specified)
&& ((VAR_P (decl) && TREE_STATIC (decl))
|| TREE_CODE (decl) == FUNCTION_DECL)
&& DECL_RTL_SET_P (decl))
make_decl_rtl (decl);
}
/* By default, static data members and function members receive
the visibility of their containing class. */
static void
determine_visibility_from_class (tree decl, tree class_type)
{
if (DECL_VISIBILITY_SPECIFIED (decl))
return;
if (determine_hidden_inline (decl))
DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
else
{
/* Default to the class visibility. */
DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
DECL_VISIBILITY_SPECIFIED (decl)
= CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
}
/* Give the target a chance to override the visibility associated
with DECL. */
if (VAR_P (decl)
&& TREE_PUBLIC (decl)
&& (DECL_TINFO_P (decl) || DECL_VTABLE_OR_VTT_P (decl))
&& !DECL_REALLY_EXTERN (decl)
&& !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
targetm.cxx.determine_class_data_visibility (decl);
}
/* Returns true iff DECL is an inline that should get hidden visibility
because of -fvisibility-inlines-hidden. */
static bool
determine_hidden_inline (tree decl)
{
return (visibility_options.inlines_hidden
/* Don't do this for inline templates; specializations might not be
inline, and we don't want them to inherit the hidden
visibility. We'll set it here for all inline instantiations. */
&& !processing_template_decl
&& TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& (! DECL_LANG_SPECIFIC (decl)
|| ! DECL_EXPLICIT_INSTANTIATION (decl)));
}
/* 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 = DECL_CHAIN (t))
if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node
&& !DECL_ARTIFICIAL (t))
{
tree ftype = strip_pointer_or_array_types (TREE_TYPE (t));
int subvis = type_visibility (ftype);
if (subvis == VISIBILITY_ANON)
{
if (!in_main_input_context())
{
tree nlt = no_linkage_check (ftype, /*relaxed_p=*/false);
if (nlt)
{
if (same_type_p (TREE_TYPE (t), nlt))
warning (OPT_Wsubobject_linkage, "\
%qT has a field %q#D whose type has no linkage",
type, t);
else
warning (OPT_Wsubobject_linkage, "\
%qT has a field %qD whose type depends on the type %qT which has no linkage",
type, t, nlt);
}
else if (cxx_dialect > cxx98
&& !decl_anon_ns_mem_p (ftype))
warning (OPT_Wsubobject_linkage, "\
%qT has a field %q#D whose type has internal linkage",
type, t);
else // In C++98 this can only happen with unnamed namespaces.
warning (OPT_Wsubobject_linkage, "\
%qT has a field %q#D whose type uses the anonymous namespace",
type, t);
}
}
else if (MAYBE_CLASS_TYPE_P (ftype)
&& vis < VISIBILITY_HIDDEN
&& subvis >= VISIBILITY_HIDDEN)
warning (OPT_Wattributes, "\
%qT declared with greater visibility than the type of its field %qD",
type, t);
}
binfo = TYPE_BINFO (type);
for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
{
tree btype = BINFO_TYPE (t);
int subvis = type_visibility (btype);
if (subvis == VISIBILITY_ANON)
{
if (!in_main_input_context())
{
tree nlt = no_linkage_check (btype, /*relaxed_p=*/false);
if (nlt)
{
if (same_type_p (btype, nlt))
warning (OPT_Wsubobject_linkage, "\
%qT has a base %qT which has no linkage",
type, btype);
else
warning (OPT_Wsubobject_linkage, "\
%qT has a base %qT which depends on the type %qT which has no linkage",
type, btype, nlt);
}
else if (cxx_dialect > cxx98
&& !decl_anon_ns_mem_p (btype))
warning (OPT_Wsubobject_linkage, "\
%qT has a base %qT which has internal linkage",
type, btype);
else // In C++98 this can only happen with unnamed namespaces.
warning (OPT_Wsubobject_linkage, "\
%qT has a base %qT which uses the anonymous namespace",
type, btype);
}
}
else if (vis < VISIBILITY_HIDDEN
&& subvis >= VISIBILITY_HIDDEN)
warning (OPT_Wattributes, "\
%qT declared with greater visibility than its base %qT",
type, TREE_TYPE (t));
}
}
/* Functions for adjusting the visibility of a tagged type and its nested
types and declarations when it gets a name for linkage purposes from a
typedef. */
// FIXME: It is now a DR for such a class type to contain anything
// other than C. So at minium most of this can probably be deleted.
/* First reset the visibility of all the types. */
static void
reset_type_linkage_1 (tree type)
{
set_linkage_according_to_type (type, TYPE_MAIN_DECL (type));
if (CLASS_TYPE_P (type))
for (tree member = TYPE_FIELDS (type); member; member = DECL_CHAIN (member))
if (DECL_IMPLICIT_TYPEDEF_P (member))
reset_type_linkage_1 (TREE_TYPE (member));
}
/* Then reset the visibility of any static data members or member
functions that use those types. */
static void
reset_decl_linkage (tree decl)
{
if (TREE_PUBLIC (decl))
return;
if (DECL_CLONED_FUNCTION_P (decl))
return;
TREE_PUBLIC (decl) = true;
DECL_INTERFACE_KNOWN (decl) = false;
determine_visibility (decl);
tentative_decl_linkage (decl);
}
void
reset_type_linkage (tree type)
{
reset_type_linkage_1 (type);
if (CLASS_TYPE_P (type))
{
if (tree vt = CLASSTYPE_VTABLES (type))
{
tree name = mangle_vtbl_for_type (type);
DECL_NAME (vt) = name;
SET_DECL_ASSEMBLER_NAME (vt, name);
reset_decl_linkage (vt);
}
if (!ANON_AGGR_TYPE_P (type))
if (tree ti = CLASSTYPE_TYPEINFO_VAR (type))
{
tree name = mangle_typeinfo_for_type (type);
DECL_NAME (ti) = name;
SET_DECL_ASSEMBLER_NAME (ti, name);
TREE_TYPE (name) = type;
reset_decl_linkage (ti);
}
for (tree m = TYPE_FIELDS (type); m; m = DECL_CHAIN (m))
{
tree mem = STRIP_TEMPLATE (m);
if (TREE_CODE (mem) == VAR_DECL || TREE_CODE (mem) == FUNCTION_DECL)
reset_decl_linkage (mem);
else if (DECL_IMPLICIT_TYPEDEF_P (mem))
reset_type_linkage (TREE_TYPE (mem));
}
}
}
/* Set up our initial idea of what the linkage of DECL should be. */
void
tentative_decl_linkage (tree decl)
{
if (DECL_INTERFACE_KNOWN (decl))
/* We've already made a decision as to how this function will
be handled. */;
else if (vague_linkage_p (decl))
{
if (TREE_CODE (decl) == FUNCTION_DECL
&& decl_defined_p (decl))
{
DECL_EXTERNAL (decl) = 1;
DECL_NOT_REALLY_EXTERN (decl) = 1;
note_vague_linkage_fn (decl);
/* A non-template inline function with external linkage will
always be COMDAT. As we must eventually determine the
linkage of all functions, and as that causes writes to
the data mapped in from the PCH file, it's advantageous
to mark the functions at this point. */
if (DECL_DECLARED_INLINE_P (decl)
&& (!DECL_IMPLICIT_INSTANTIATION (decl)
|| DECL_DEFAULTED_FN (decl)))
{
/* This function must have external linkage, as
otherwise DECL_INTERFACE_KNOWN would have been
set. */
gcc_assert (TREE_PUBLIC (decl));
comdat_linkage (decl);
DECL_INTERFACE_KNOWN (decl) = 1;
}
}
else if (VAR_P (decl))
maybe_commonize_var (decl);
}
}
/* 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)
{
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. */
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 (VAR_OR_FUNCTION_DECL_P (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;
if (VAR_P (decl) && DECL_VTABLE_OR_VTT_P (decl))
{
class_type = DECL_CONTEXT (decl);
import_export_class (class_type);
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 (VAR_P (decl) && DECL_TINFO_P (decl))
{
tree type = TREE_TYPE (DECL_NAME (decl));
if (CLASS_TYPE_P (type))
{
class_type = type;
import_export_class (type);
if (CLASSTYPE_INTERFACE_KNOWN (type)
&& TYPE_POLYMORPHIC_P (type)
&& CLASSTYPE_INTERFACE_ONLY (type)
/* If -fno-rtti was specified, then we cannot be sure
that RTTI information will be emitted with the
virtual table of the class, so we must emit it
wherever it is used. */
&& flag_rtti)
import_p = true;
else
{
if (CLASSTYPE_INTERFACE_KNOWN (type)
&& !CLASSTYPE_INTERFACE_ONLY (type))
{
comdat_p = (targetm.cxx.class_data_always_comdat ()
|| (CLASSTYPE_KEY_METHOD (type)
&& DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
mark_needed (decl);
if (!flag_weak)
{
comdat_p = false;
DECL_EXTERNAL (decl) = 0;
}
}
else
comdat_p = true;
}
}
else
comdat_p = true;
}
else if (DECL_TEMPLOID_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 clean = cxx_maybe_build_cleanup (decl, tf_warning_or_error);
gcc_assert (clean != NULL_TREE);
return clean;
}
/* GUARD is a helper variable for DECL; make them have the same linkage and
visibility. */
void
copy_linkage (tree guard, tree decl)
{
TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
TREE_STATIC (guard) = TREE_STATIC (decl);
DECL_COMMON (guard) = DECL_COMMON (decl);
DECL_COMDAT (guard) = DECL_COMDAT (decl);
if (TREE_STATIC (guard))
{
CP_DECL_THREAD_LOCAL_P (guard) = CP_DECL_THREAD_LOCAL_P (decl);
set_decl_tls_model (guard, DECL_TLS_MODEL (decl));
if (DECL_ONE_ONLY (decl))
make_decl_one_only (guard, cxx_comdat_group (guard));
if (TREE_PUBLIC (decl))
DECL_WEAK (guard) = DECL_WEAK (decl);
/* Also check vague_linkage_p, as DECL_WEAK and DECL_ONE_ONLY might not
be set until import_export_decl at EOF. */
if (vague_linkage_p (decl))
comdat_linkage (guard);
DECL_VISIBILITY (guard) = DECL_VISIBILITY (decl);
DECL_VISIBILITY_SPECIFIED (guard) = DECL_VISIBILITY_SPECIFIED (decl);
}
}
/* Returns the initialization guard variable for the variable DECL,
which has static storage duration. */
tree
get_guard (tree decl)
{
tree sname = mangle_guard_variable (decl);
tree guard = get_global_binding (sname);
if (! guard)
{
tree guard_type;
/* We use a type that is big enough to contain a mutex as well
as an integer counter. */
guard_type = targetm.cxx.guard_type ();
guard = build_decl (DECL_SOURCE_LOCATION (decl),
VAR_DECL, sname, guard_type);
/* The guard should have the same linkage as what it guards. */
copy_linkage (guard, decl);
DECL_ARTIFICIAL (guard) = 1;
DECL_IGNORED_P (guard) = 1;
TREE_USED (guard) = 1;
pushdecl_top_level_and_finish (guard, NULL_TREE);
}
return guard;
}
/* Returns true if accessing the GUARD atomic is expensive,
i.e. involves a call to __sync_synchronize or similar.
In this case let __cxa_guard_acquire handle the atomics. */
static bool
is_atomic_expensive_p (machine_mode mode)
{
if (!flag_inline_atomics)
return true;
if (!can_compare_and_swap_p (mode, false) || !can_atomic_load_p (mode))
return true;
return false;
}
/* Return an atomic load of src with the appropriate memory model. */
static tree
build_atomic_load_type (tree src, HOST_WIDE_INT model, tree type)
{
tree ptr_type = build_pointer_type (type);
tree mem_model = build_int_cst (integer_type_node, model);
tree t, addr, val;
unsigned int size;
int fncode;
size = tree_to_uhwi (TYPE_SIZE_UNIT (type));
fncode = BUILT_IN_ATOMIC_LOAD_N + exact_log2 (size) + 1;
t = builtin_decl_implicit ((enum built_in_function) fncode);
addr = build1 (ADDR_EXPR, ptr_type, src);
val = build_call_expr (t, 2, addr, mem_model);
return val;
}
/* 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, bool thread_safe)
{
tree guard_value;
if (!thread_safe)
guard = get_guard_bits (guard);
else
{
tree type = targetm.cxx.guard_mask_bit ()
? TREE_TYPE (guard) : char_type_node;
if (is_atomic_expensive_p (TYPE_MODE (type)))
guard = integer_zero_node;
else
guard = build_atomic_load_type (guard, MEMMODEL_ACQUIRE, type);
}
/* 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 = fold_convert (TREE_TYPE (guard), guard_value);
guard = cp_build_binary_op (input_location,
BIT_AND_EXPR, guard, guard_value,
tf_warning_or_error);
}
guard_value = integer_zero_node;
if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
guard_value = fold_convert (TREE_TYPE (guard), guard_value);
return cp_build_binary_op (input_location,
EQ_EXPR, guard, guard_value,
tf_warning_or_error);
}
/* Return an expression which sets the GUARD variable, indicating that
the variable being guarded has been initialized. */
tree
set_guard (tree guard)
{
tree guard_init;
/* Set the GUARD to one. */
guard = get_guard_bits (guard);
guard_init = integer_one_node;
if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
guard_init = fold_convert (TREE_TYPE (guard), guard_init);
return cp_build_modify_expr (input_location, guard, NOP_EXPR, guard_init,
tf_warning_or_error);
}
/* Returns true iff we can tell that VAR does not have a dynamic
initializer. */
static bool
var_defined_without_dynamic_init (tree var)
{
/* constinit vars are guaranteed to not have dynamic initializer,
but still registering the destructor counts as dynamic initialization. */
if (DECL_DECLARED_CONSTINIT_P (var)
&& COMPLETE_TYPE_P (TREE_TYPE (var))
&& !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var)))
return true;
/* If it's defined in another TU, we can't tell. */
if (DECL_EXTERNAL (var))
return false;
/* If it has a non-trivial destructor, registering the destructor
counts as dynamic initialization. */
if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TREE_TYPE (var)))
return false;
/* If it's in this TU, its initializer has been processed, unless
it's a case of self-initialization, then DECL_INITIALIZED_P is
false while the initializer is handled by finish_id_expression. */
if (!DECL_INITIALIZED_P (var))
return false;
/* If it has no initializer or a constant one, it's not dynamic. */
return (!DECL_NONTRIVIALLY_INITIALIZED_P (var)
|| DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (var));
}
/* Returns true iff VAR is a variable that needs uses to be
wrapped for possible dynamic initialization. */
static bool
var_needs_tls_wrapper (tree var)
{
return (!error_operand_p (var)
&& CP_DECL_THREAD_LOCAL_P (var)
&& !DECL_GNU_TLS_P (var)
&& !DECL_FUNCTION_SCOPE_P (var)
&& !var_defined_without_dynamic_init (var));
}
/* Get the FUNCTION_DECL for the shared TLS init function for this
translation unit. */
static tree
get_local_tls_init_fn (location_t loc)
{
tree sname = get_identifier ("__tls_init");
tree fn = get_global_binding (sname);
if (!fn)
{
fn = build_lang_decl_loc (loc, FUNCTION_DECL, sname,
build_function_type (void_type_node,
void_list_node));
SET_DECL_LANGUAGE (fn, lang_c);
TREE_PUBLIC (fn) = false;
DECL_ARTIFICIAL (fn) = true;
mark_used (fn);
set_global_binding (fn);
}
return fn;
}
/* Get a FUNCTION_DECL for the init function for the thread_local
variable VAR. The init function will be an alias to the function
that initializes all the non-local TLS variables in the translation
unit. The init function is only used by the wrapper function. */
static tree
get_tls_init_fn (tree var)
{
/* Only C++11 TLS vars need this init fn. */
if (!var_needs_tls_wrapper (var))
return NULL_TREE;
/* If -fno-extern-tls-init, assume that we don't need to call
a tls init function for a variable defined in another TU. */
if (!flag_extern_tls_init && DECL_EXTERNAL (var))
return NULL_TREE;
/* If the variable is internal, or if we can't generate aliases,
call the local init function directly. */
if (!TREE_PUBLIC (var) || !TARGET_SUPPORTS_ALIASES)
return get_local_tls_init_fn (DECL_SOURCE_LOCATION (var));
tree sname = mangle_tls_init_fn (var);
tree fn = get_global_binding (sname);
if (!fn)
{
fn = build_lang_decl (FUNCTION_DECL, sname,
build_function_type (void_type_node,
void_list_node));
SET_DECL_LANGUAGE (fn, lang_c);
TREE_PUBLIC (fn) = TREE_PUBLIC (var);
DECL_ARTIFICIAL (fn) = true;
DECL_COMDAT (fn) = DECL_COMDAT (var);
DECL_EXTERNAL (fn) = DECL_EXTERNAL (var);
if (DECL_ONE_ONLY (var))
make_decl_one_only (fn, cxx_comdat_group (fn));
if (TREE_PUBLIC (var))
{
tree obtype = strip_array_types (non_reference (TREE_TYPE (var)));
/* If the variable is defined somewhere else and might have static
initialization, make the init function a weak reference. */
if ((!TYPE_NEEDS_CONSTRUCTING (obtype)
|| TYPE_HAS_CONSTEXPR_CTOR (obtype)
|| TYPE_HAS_TRIVIAL_DFLT (obtype))
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (obtype)
&& DECL_EXTERNAL (var))
declare_weak (fn);
else
DECL_WEAK (fn) = DECL_WEAK (var);
}
DECL_VISIBILITY (fn) = DECL_VISIBILITY (var);
DECL_VISIBILITY_SPECIFIED (fn) = DECL_VISIBILITY_SPECIFIED (var);
DECL_DLLIMPORT_P (fn) = DECL_DLLIMPORT_P (var);
DECL_IGNORED_P (fn) = 1;
mark_used (fn);
DECL_BEFRIENDING_CLASSES (fn) = var;
set_global_binding (fn);
}
return fn;
}
/* Get a FUNCTION_DECL for the init wrapper function for the thread_local
variable VAR. The wrapper function calls the init function (if any) for
VAR and then returns a reference to VAR. The wrapper function is used
in place of VAR everywhere VAR is mentioned. */
static tree
get_tls_wrapper_fn (tree var)
{
/* Only C++11 TLS vars need this wrapper fn. */
if (!var_needs_tls_wrapper (var))
return NULL_TREE;
tree sname = mangle_tls_wrapper_fn (var);
tree fn = get_global_binding (sname);
if (!fn)
{
/* A named rvalue reference is an lvalue, so the wrapper should
always return an lvalue reference. */
tree type = non_reference (TREE_TYPE (var));
type = build_reference_type (type);
tree fntype = build_function_type (type, void_list_node);
fn = build_lang_decl_loc (DECL_SOURCE_LOCATION (var),
FUNCTION_DECL, sname, fntype);
SET_DECL_LANGUAGE (fn, lang_c);
TREE_PUBLIC (fn) = TREE_PUBLIC (var);
DECL_ARTIFICIAL (fn) = true;
DECL_IGNORED_P (fn) = 1;
/* The wrapper is inline and emitted everywhere var is used. */
DECL_DECLARED_INLINE_P (fn) = true;
if (TREE_PUBLIC (var))
{
comdat_linkage (fn);
#ifdef HAVE_GAS_HIDDEN
/* Make the wrapper bind locally; there's no reason to share
the wrapper between multiple shared objects. */
DECL_VISIBILITY (fn) = VISIBILITY_INTERNAL;
DECL_VISIBILITY_SPECIFIED (fn) = true;
#endif
}
if (!TREE_PUBLIC (fn))
DECL_INTERFACE_KNOWN (fn) = true;
mark_used (fn);
note_vague_linkage_fn (fn);
#if 0
/* We want CSE to commonize calls to the wrapper, but marking it as
pure is unsafe since it has side-effects. I guess we need a new
ECF flag even weaker than ECF_PURE. FIXME! */
DECL_PURE_P (fn) = true;
#endif
DECL_BEFRIENDING_CLASSES (fn) = var;
set_global_binding (fn);
}
return fn;
}
/* If EXPR is a thread_local variable that should be wrapped by init
wrapper function, return a call to that function, otherwise return
NULL. */
tree
maybe_get_tls_wrapper_call (tree expr)
{
if (VAR_P (expr)
&& !processing_template_decl
&& !cp_unevaluated_operand
&& CP_DECL_THREAD_LOCAL_P (expr))
if (tree wrap = get_tls_wrapper_fn (expr))
return build_cxx_call (wrap, 0, NULL, tf_warning_or_error);
return NULL;
}
/* At EOF, generate the definition for the TLS wrapper function FN:
T& var_wrapper() {
if (init_fn) init_fn();
return var;
} */
static void
generate_tls_wrapper (tree fn)
{
tree var = DECL_BEFRIENDING_CLASSES (fn);
start_preparsed_function (fn, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);
tree body = begin_function_body ();
/* Only call the init fn if there might be one. */
if (tree init_fn = get_tls_init_fn (var))
{
tree if_stmt = NULL_TREE;
/* If init_fn is a weakref, make sure it exists before calling. */
if (lookup_attribute ("weak", DECL_ATTRIBUTES (init_fn)))
{
if_stmt = begin_if_stmt ();
tree addr = cp_build_addr_expr (init_fn, tf_warning_or_error);
tree cond = cp_build_binary_op (DECL_SOURCE_LOCATION (var),
NE_EXPR, addr, nullptr_node,
tf_warning_or_error);
finish_if_stmt_cond (cond, if_stmt);
}
finish_expr_stmt (build_cxx_call
(init_fn, 0, NULL, tf_warning_or_error));
if (if_stmt)
{
finish_then_clause (if_stmt);
finish_if_stmt (if_stmt);
}
}
else
/* If there's no initialization, the wrapper is a constant function. */
TREE_READONLY (fn) = true;
finish_return_stmt (convert_from_reference (var));
finish_function_body (body);
expand_or_defer_fn (finish_function (/*inline_p=*/false));
}
/* Start a global constructor or destructor function. */
static tree
start_objects (bool initp, unsigned priority, bool has_body)
{
bool default_init = initp && priority == DEFAULT_INIT_PRIORITY;
bool is_module_init = default_init && module_global_init_needed ();
tree name = NULL_TREE;
if (is_module_init)
name = mangle_module_global_init (0);
else
{
char type[14];
/* We use `I' to indicate initialization and `D' to indicate
destruction. */
unsigned len = sprintf (type, "sub_%c", initp ? 'I' : 'D');
if (priority != DEFAULT_INIT_PRIORITY)
{
char joiner = '_';
#ifdef JOINER
joiner = JOINER;
#endif
type[len++] = joiner;
sprintf (type + len, "%.5u", priority);
}
name = get_file_function_name (type);
}
tree fntype = build_function_type (void_type_node, void_list_node);
tree fndecl = build_lang_decl (FUNCTION_DECL, name, fntype);
DECL_CONTEXT (fndecl) = FROB_CONTEXT (global_namespace);
if (is_module_init)
{
SET_DECL_ASSEMBLER_NAME (fndecl, name);
TREE_PUBLIC (fndecl) = true;
determine_visibility (fndecl);
}
else
TREE_PUBLIC (fndecl) = 0;
start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
/* Mark as artificial because it's not explicitly in the user's
source code. */
DECL_ARTIFICIAL (current_function_decl) = 1;
/* Mark this declaration as used to avoid spurious warnings. */
TREE_USED (current_function_decl) = 1;
/* Mark this function as a global constructor or destructor. */
if (initp)
DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
else
DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
tree body = begin_compound_stmt (BCS_FN_BODY);
if (is_module_init && has_body)
{
// If the function is going to be empty, don't emit idempotency.
// 'static bool __in_chrg = false;
// if (__inchrg) return;
// __inchrg = true
tree var = build_lang_decl (VAR_DECL, in_charge_identifier,
boolean_type_node);
DECL_CONTEXT (var) = fndecl;
DECL_ARTIFICIAL (var) = true;
TREE_STATIC (var) = true;
pushdecl (var);
cp_finish_decl (var, NULL_TREE, false, NULL_TREE, 0);
tree if_stmt = begin_if_stmt ();
finish_if_stmt_cond (var, if_stmt);
finish_return_stmt (NULL_TREE);
finish_then_clause (if_stmt);
finish_if_stmt (if_stmt);
tree assign = build2 (MODIFY_EXPR, boolean_type_node,
var, boolean_true_node);
TREE_SIDE_EFFECTS (assign) = true;
finish_expr_stmt (assign);
}
return body;
}
/* Finish a global constructor or destructor. Add it to the global
ctors or dtors, if STARTP is true. */
static tree
finish_objects (bool initp, unsigned priority, tree body, bool startp)
{
/* Finish up. */
finish_compound_stmt (body);
tree fn = finish_function (/*inline_p=*/false);
if (!startp)
; // Neither ctor nor dtor I be.
else if (initp)
{
DECL_STATIC_CONSTRUCTOR (fn) = 1;
decl_init_priority_insert (fn, priority);
}
else
{
DECL_STATIC_DESTRUCTOR (fn) = 1;
decl_fini_priority_insert (fn, priority);
}
return fn;
}
/* 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"
/* Begins the generation of the function that will handle all
initialization or destruction of objects with static storage
duration at PRIORITY.
It is assumed that this function will only be called once. */
static tree
start_partial_init_fini_fn (bool initp, unsigned priority, unsigned count)
{
char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
/* Create the identifier for this function. It will be of the form
SSDF_IDENTIFIER_. */
sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
tree type = build_function_type (void_type_node, void_list_node);
/* Create the FUNCTION_DECL itself. */
tree fn = build_lang_decl (FUNCTION_DECL, get_identifier (id), type);
TREE_PUBLIC (fn) = 0;
DECL_ARTIFICIAL (fn) = 1;
/* Put this function in the list of functions to be called from the
static constructors and destructors. */
if (!static_init_fini_fns[initp])
static_init_fini_fns[initp] = priority_map_t::create_ggc ();
auto &slot = static_init_fini_fns[initp]->get_or_insert (priority);
slot = tree_cons (fn, NULL_TREE, slot);
/* Put the function in the global scope. */
pushdecl (fn);
/* 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 (fn, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
/* Set up the scope of the outermost block in the function. */
return begin_compound_stmt (BCS_FN_BODY);
}
/* Finish the generation of the function which performs initialization
or destruction of objects with static storage duration. */
static void
finish_partial_init_fini_fn (tree body)
{
/* Close out the function. */
finish_compound_stmt (body);
expand_or_defer_fn (finish_function (/*inline_p=*/false));
}
/* The effective initialization priority of a DECL. */
#define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
/* Whether a DECL needs a guard to protect it against multiple
initialization. */
#define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
|| DECL_ONE_ONLY (decl) \
|| DECL_WEAK (decl)))
/* Walks the initializer list of a global variable and looks for
temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
and that have their DECL_CONTEXT() == NULL. For each such
temporary variable, set their DECL_CONTEXT() to CTX -- the
initializing function. This is necessary because otherwise some
optimizers (enabled by -O2 -fprofile-arcs) might crash when trying
to refer to a temporary variable that does not have its
DECL_CONTEXT() properly set. */
static tree
fix_temporary_vars_context_r (tree *node,
int * /*unused*/,
void *ctx)
{
if (TREE_CODE (*node) == BIND_EXPR)
for (tree var = BIND_EXPR_VARS (*node); var; var = DECL_CHAIN (var))
if (VAR_P (var) && !DECL_NAME (var)
&& DECL_ARTIFICIAL (var) && !DECL_CONTEXT (var))
DECL_CONTEXT (var) = tree (ctx);
return NULL_TREE;
}
/* Set up to handle the initialization or destruction of DECL. If
INITP is nonzero, we are initializing the variable. Otherwise, we
are destroying it. */
static void
one_static_initialization_or_destruction (bool initp, tree decl, tree init)
{
/* If we are supposed to destruct and there's a trivial destructor,
nothing has to be done. */
gcc_checking_assert (init || !TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)));
/* Trick the compiler into thinking we are at the file and line
where DECL was declared so that error-messages make sense, and so
that the debugger will show somewhat sensible file and line
information. */
input_location = DECL_SOURCE_LOCATION (decl);
/* Make sure temporary variables in the initialiser all have
their DECL_CONTEXT() set to a value different from NULL_TREE.
This can happen when global variables initializers are built.
In that case, the DECL_CONTEXT() of the global variables _AND_ of all
the temporary variables that might have been generated in the
accompanying initializers is NULL_TREE, meaning the variables have been
declared in the global namespace.
What we want to do here is to fix that and make sure the DECL_CONTEXT()
of the temporaries are set to the current function decl. */
cp_walk_tree_without_duplicates (&init,
fix_temporary_vars_context_r,
current_function_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. */
tree guard_if_stmt = 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 = get_guard (decl);
tree guard_cond;
if (flag_use_cxa_atexit)
{
/* When using __cxa_atexit, we just check the GUARD as we
would for a local static. We never try to destroy
anything from a static destructor. */
gcc_assert (initp);
guard_cond = get_guard_cond (guard, false);
}
else
{
/* 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 was or becomes zero (initp vs !initp
respectively). */
guard_cond = cp_build_unary_op (initp ? POSTINCREMENT_EXPR
: PREDECREMENT_EXPR,
guard,
/*noconvert=*/true,
tf_warning_or_error);
guard_cond = cp_build_binary_op (input_location, EQ_EXPR, guard_cond,
integer_zero_node,
tf_warning_or_error);
}
guard_if_stmt = begin_if_stmt ();
finish_if_stmt_cond (guard_cond, guard_if_stmt);
if (flag_use_cxa_atexit)
/* Set the GUARD now. */
finish_expr_stmt (set_guard (guard));
}
/* Perform the initialization or destruction. */
if (initp)
{
if (init)
{
finish_expr_stmt (init);
if (sanitize_flags_p (SANITIZE_ADDRESS, decl))
if (varpool_node *vnode = varpool_node::get (decl))
vnode->dynamically_initialized = 1;
}
/* If we're using __cxa_atexit, register a function that calls the
destructor for the object. */
if (flag_use_cxa_atexit)
finish_expr_stmt (register_dtor_fn (decl));
}
else
finish_expr_stmt (build_cleanup (decl));
/* Finish the guard if-stmt, if necessary. */
if (guard_if_stmt)
{
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
emit_partial_init_fini_fn (bool initp, unsigned priority, tree vars,
unsigned counter, location_t locus)
{
input_location = locus;
tree body = start_partial_init_fini_fn (initp, priority, counter);
for (tree node = vars; node; node = TREE_CHAIN (node))
/* Do one initialization or destruction. */
one_static_initialization_or_destruction (initp, TREE_VALUE (node),
TREE_PURPOSE (node));
/* Finish up the static storage duration function for this
round. */
input_location = locus;
finish_partial_init_fini_fn (body);
}
/* 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. That order is preserved. */
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 (error_operand_p (decl))
{
var = &TREE_CHAIN (t);
continue;
}
/* The only things that can be initialized are variables. */
gcc_assert (VAR_P (decl));
/* If this object is not defined, we don't need to do anything
here. */
if (DECL_EXTERNAL (decl))
{
var = &TREE_CHAIN (t);
continue;
}
/* Also, if the initializer already contains errors, we can bail
out now. */
if (init && TREE_CODE (init) == TREE_LIST
&& value_member (error_mark_node, init))
{
var = &TREE_CHAIN (t);
continue;
}
/* This variable is going to need initialization and/or
finalization, so we add it to the list. */
*var = TREE_CHAIN (t);
TREE_CHAIN (t) = result;
result = t;
}
return result;
}
/* Split VAR_LIST by init priority and add into PARTS hash table.
This reverses the variable ordering. */
void
partition_vars_for_init_fini (tree var_list, priority_map_t *(&parts)[2])
{
for (auto node = var_list; node; node = TREE_CHAIN (node))
{
tree decl = TREE_VALUE (node);
tree init = TREE_PURPOSE (node);
bool has_cleanup = !TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl));
unsigned priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
if (init || (flag_use_cxa_atexit && has_cleanup))
{
// Add to initialization list.
if (!parts[true])
parts[true] = priority_map_t::create_ggc ();
auto &slot = parts[true]->get_or_insert (priority);
slot = tree_cons (init, decl, slot);
}
if (!flag_use_cxa_atexit && has_cleanup)
{
// Add to finalization list.
if (!parts[false])
parts[false] = priority_map_t::create_ggc ();
auto &slot = parts[false]->get_or_insert (priority);
slot = tree_cons (NULL_TREE, decl, slot);
}
}
}
/* 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 or destructor that calls the given
init/fini fns at the indicated priority. */
static void
generate_ctor_or_dtor_function (bool initp, unsigned priority,
tree fns, location_t locus)
{
input_location = locus;
tree body = start_objects (initp, priority, bool (fns));
if (fns)
{
/* To make sure dynamic construction doesn't access globals from
other compilation units where they might not be yet
constructed, for -fsanitize=address insert
__asan_before_dynamic_init call that prevents access to
either all global variables that need construction in other
compilation units, or at least those that haven't been
initialized yet. Variables that need dynamic construction in
the current compilation unit are kept accessible. */
if (initp && (flag_sanitize & SANITIZE_ADDRESS))
finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/false));
/* Call the static init/fini functions. */
for (tree node = fns; node; node = TREE_CHAIN (node))
{
tree fn = TREE_PURPOSE (node);
// We should never find a pure or constant cdtor.
gcc_checking_assert (!(flags_from_decl_or_type (fn)
& (ECF_CONST | ECF_PURE)));
tree call = cp_build_function_call_nary (fn, tf_warning_or_error,
NULL_TREE);
finish_expr_stmt (call);
}
/* Revert what __asan_before_dynamic_init did by calling
__asan_after_dynamic_init. */
if (initp && (flag_sanitize & SANITIZE_ADDRESS))
finish_expr_stmt (asan_dynamic_init_call (/*after_p=*/true));
}
/* Close out the function, and arrange for it to be called at init
or fini time, if non-empty. (Even non-nop module initializer
functions need this, as we cannot guarantee the module is
imported somewhere in the program.) */
expand_or_defer_fn (finish_objects (initp, priority, body, fns != NULL_TREE));
}
/* Return C++ property of T, based on given operation OP. */
static int
cpp_check (tree t, cpp_operation op)
{
switch (op)
{
case HAS_DEPENDENT_TEMPLATE_ARGS:
{
tree ti = CLASSTYPE_TEMPLATE_INFO (t);
if (!ti)
return 0;
++processing_template_decl;
const bool dep = any_dependent_template_arguments_p (TI_ARGS (ti));
--processing_template_decl;
return dep;
}
case IS_ABSTRACT:
return DECL_PURE_VIRTUAL_P (t);
case IS_ASSIGNMENT_OPERATOR:
return DECL_ASSIGNMENT_OPERATOR_P (t);
case IS_CONSTRUCTOR:
return DECL_CONSTRUCTOR_P (t);
case IS_DESTRUCTOR:
return DECL_DESTRUCTOR_P (t);
case IS_COPY_CONSTRUCTOR:
return DECL_COPY_CONSTRUCTOR_P (t);
case IS_MOVE_CONSTRUCTOR:
return DECL_MOVE_CONSTRUCTOR_P (t);
case IS_TEMPLATE:
return TREE_CODE (t) == TEMPLATE_DECL;
case IS_TRIVIAL:
return trivial_type_p (t);
default:
return 0;
}
}
/* Collect source file references recursively, starting from NAMESPC. */
static void
collect_source_refs (tree namespc)
{
/* Iterate over names in this name space. */
for (tree t = NAMESPACE_LEVEL (namespc)->names; t; t = TREE_CHAIN (t))
if (DECL_IS_UNDECLARED_BUILTIN (t))
;
else if (TREE_CODE (t) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (t))
collect_source_refs (t);
else
collect_source_ref (DECL_SOURCE_FILE (t));
}
/* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
starting from NAMESPC. */
static void
collect_ada_namespace (tree namespc, const char *source_file)
{
tree decl = NAMESPACE_LEVEL (namespc)->names;
/* Collect decls from this namespace. This will skip
NAMESPACE_DECLs (both aliases and regular, it cannot tell). */
collect_ada_nodes (decl, source_file);
/* Now scan for namespace children, and dump them. */
for (; decl; decl = TREE_CHAIN (decl))
if (TREE_CODE (decl) == NAMESPACE_DECL && !DECL_NAMESPACE_ALIAS (decl))
collect_ada_namespace (decl, source_file);
}
/* Returns true iff there is a definition available for variable or
function DECL. */
bool
decl_defined_p (tree decl)
{
if (TREE_CODE (decl) == FUNCTION_DECL)
return (DECL_INITIAL (decl) != NULL_TREE
/* A pending instantiation of a friend temploid is defined. */
|| (DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
&& DECL_INITIAL (DECL_TEMPLATE_RESULT
(DECL_TI_TEMPLATE (decl)))));
else
{
gcc_assert (VAR_P (decl));
return !DECL_EXTERNAL (decl);
}
}
/* Nonzero for a VAR_DECL whose value can be used in a constant expression.
[expr.const]
An integral constant-expression can only involve ... const
variables of integral or enumeration types initialized with
constant expressions ...
C++0x also allows constexpr variables and temporaries initialized
with constant expressions. We handle the former here, but the latter
are just folded away in cxx_eval_constant_expression.
The standard does not require that the expression be non-volatile.
G++ implements the proposed correction in DR 457. */
bool
decl_constant_var_p (tree decl)
{
if (!decl_maybe_constant_var_p (decl))
return false;
/* We don't know if a template static data member is initialized with
a constant expression until we instantiate its initializer. Even
in the case of a constexpr variable, we can't treat it as a
constant until its initializer is complete in case it's used in
its own initializer. */
maybe_instantiate_decl (decl);
return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl);
}
/* Returns true if DECL could be a symbolic constant variable, depending on
its initializer. */
bool
decl_maybe_constant_var_p (tree decl)
{
tree type = TREE_TYPE (decl);
if (!VAR_P (decl))
return false;
if (DECL_DECLARED_CONSTEXPR_P (decl) && !TREE_THIS_VOLATILE (decl))
return true;
if (DECL_HAS_VALUE_EXPR_P (decl))
/* A proxy isn't constant. */
return false;
if (TYPE_REF_P (type))
/* References can be constant. */;
else if (CP_TYPE_CONST_NON_VOLATILE_P (type)
&& INTEGRAL_OR_ENUMERATION_TYPE_P (type))
/* And const integers. */;
else
return false;
if (DECL_INITIAL (decl)
&& !DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
/* We know the initializer, and it isn't constant. */
return false;
else
return true;
}
/* Complain that DECL uses a type with no linkage. In C++98 mode this is
called from grokfndecl and grokvardecl; in all modes it is called from
cp_write_global_declarations. */
void
no_linkage_error (tree decl)
{
if (cxx_dialect >= cxx11
&& (decl_defined_p (decl)
/* Treat templates which limit_bad_template_recursion decided
not to instantiate as if they were defined. */
|| (errorcount + sorrycount > 0
&& DECL_LANG_SPECIFIC (decl)
&& DECL_TEMPLATE_INFO (decl)
&& warning_suppressed_p (decl /* What warning? */))))
/* In C++11 it's ok if the decl is defined. */
return;
if (DECL_LANG_SPECIFIC (decl) && DECL_MODULE_IMPORT_P (decl))
/* An imported decl is ok. */
return;
tree t = no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false);
if (t == NULL_TREE)
/* The type that got us on no_linkage_decls must have gotten a name for
linkage purposes. */;
else if (CLASS_TYPE_P (t) && TYPE_BEING_DEFINED (t))
// FIXME: This is now invalid, as a DR to c++98
/* The type might end up having a typedef name for linkage purposes. */
vec_safe_push (no_linkage_decls, decl);
else if (TYPE_UNNAMED_P (t))
{
bool d = false;
auto_diagnostic_group grp;
if (cxx_dialect >= cxx11)
d = permerror (DECL_SOURCE_LOCATION (decl), "%q#D, declared using "
"unnamed type, is used but never defined", decl);
else if (DECL_EXTERN_C_P (decl))
/* Allow this; it's pretty common in C. */;
else if (VAR_P (decl))
/* DRs 132, 319 and 389 seem to indicate types with
no linkage can only be used to declare extern "C"
entities. Since it's not always an error in the
ISO C++ 90 Standard, we only issue a warning. */
d = warning_at (DECL_SOURCE_LOCATION (decl), 0, "unnamed type "
"with no linkage used to declare variable %q#D with "
"linkage", decl);
else
d = permerror (DECL_SOURCE_LOCATION (decl), "unnamed type with no "
"linkage used to declare function %q#D with linkage",
decl);
if (d && is_typedef_decl (TYPE_NAME (t)))
inform (DECL_SOURCE_LOCATION (TYPE_NAME (t)), "%q#D does not refer "
"to the unqualified type, so it is not used for linkage",
TYPE_NAME (t));
}
else if (cxx_dialect >= cxx11)
{
if (VAR_P (decl) || !DECL_PURE_VIRTUAL_P (decl))
permerror (DECL_SOURCE_LOCATION (decl),
"%q#D, declared using local type "
"%qT, is used but never defined", decl, t);
}
else if (VAR_P (decl))
warning_at (DECL_SOURCE_LOCATION (decl), 0, "type %qT with no linkage "
"used to declare variable %q#D with linkage", t, decl);
else
permerror (DECL_SOURCE_LOCATION (decl), "type %qT with no linkage used "
"to declare function %q#D with linkage", t, decl);
}
/* Collect declarations from all namespaces relevant to SOURCE_FILE. */
static void
collect_all_refs (const char *source_file)
{
collect_ada_namespace (global_namespace, source_file);
}
/* Clear DECL_EXTERNAL for NODE. */
static bool
clear_decl_external (struct cgraph_node *node, void * /*data*/)
{
DECL_EXTERNAL (node->decl) = 0;
return false;
}
/* Build up the function to run dynamic initializers for thread_local
variables in this translation unit and alias the init functions for the
individual variables to it. */
static void
handle_tls_init (void)
{
tree vars = prune_vars_needing_no_initialization (&tls_aggregates);
if (vars == NULL_TREE)
return;
location_t loc = DECL_SOURCE_LOCATION (TREE_VALUE (vars));
write_out_vars (vars);
tree guard = build_decl (loc, VAR_DECL, get_identifier ("__tls_guard"),
boolean_type_node);
TREE_PUBLIC (guard) = false;
TREE_STATIC (guard) = true;
DECL_ARTIFICIAL (guard) = true;
DECL_IGNORED_P (guard) = true;
TREE_USED (guard) = true;
CP_DECL_THREAD_LOCAL_P (guard) = true;
set_decl_tls_model (guard, decl_default_tls_model (guard));
pushdecl_top_level_and_finish (guard, NULL_TREE);
tree fn = get_local_tls_init_fn (loc);
start_preparsed_function (fn, NULL_TREE, SF_PRE_PARSED);
tree body = begin_function_body ();
tree if_stmt = begin_if_stmt ();
tree cond = cp_build_unary_op (TRUTH_NOT_EXPR, guard, false,
tf_warning_or_error);
finish_if_stmt_cond (cond, if_stmt);
finish_expr_stmt (cp_build_modify_expr (loc, guard, NOP_EXPR,
boolean_true_node,
tf_warning_or_error));
for (; vars; vars = TREE_CHAIN (vars))
{
tree var = TREE_VALUE (vars);
tree init = TREE_PURPOSE (vars);
one_static_initialization_or_destruction (/*initp=*/true, var, init);
/* Output init aliases even with -fno-extern-tls-init. */
if (TARGET_SUPPORTS_ALIASES && TREE_PUBLIC (var))
{
tree single_init_fn = get_tls_init_fn (var);
if (single_init_fn == NULL_TREE)
continue;
cgraph_node *alias
= cgraph_node::get_create (fn)->create_same_body_alias
(single_init_fn, fn);
gcc_assert (alias != NULL);
}
}
finish_then_clause (if_stmt);
finish_if_stmt (if_stmt);
finish_function_body (body);
expand_or_defer_fn (finish_function (/*inline_p=*/false));
}
/* We're at the end of compilation, so generate any mangling aliases that
we've been saving up, if DECL is going to be output and ID2 isn't
already taken by another declaration. */
static void
generate_mangling_alias (tree decl, tree id2)
{
struct cgraph_node *n = NULL;
if (TREE_CODE (decl) == FUNCTION_DECL)
{
n = cgraph_node::get (decl);
if (!n)
/* Don't create an alias to an unreferenced function. */
return;
}
tree *slot
= mangled_decls->find_slot_with_hash (id2, IDENTIFIER_HASH_VALUE (id2),
INSERT);
/* If there's a declaration already using this mangled name,
don't create a compatibility alias that conflicts. */
if (*slot)
return;
tree alias = make_alias_for (decl, id2);
*slot = alias;
DECL_IGNORED_P (alias) = 1;
TREE_PUBLIC (alias) = TREE_PUBLIC (decl);
DECL_VISIBILITY (alias) = DECL_VISIBILITY (decl);
if (vague_linkage_p (decl))
DECL_WEAK (alias) = 1;
if (n)
n->create_same_body_alias (alias, decl);
else
varpool_node::create_extra_name_alias (alias, decl);
}
/* Note that we might want to emit an alias with the symbol ID2 for DECL at
the end of translation, for compatibility across bugs in the mangling
implementation. */
void
note_mangling_alias (tree decl, tree id2)
{
if (TARGET_SUPPORTS_ALIASES)
{
if (!defer_mangling_aliases)
generate_mangling_alias (decl, id2);
else
{
vec_safe_push (mangling_aliases, decl);
vec_safe_push (mangling_aliases, id2);
}
}
}
/* Emit all mangling aliases that were deferred up to this point. */
void
generate_mangling_aliases ()
{
while (!vec_safe_is_empty (mangling_aliases))
{
tree id2 = mangling_aliases->pop();
tree decl = mangling_aliases->pop();
generate_mangling_alias (decl, id2);
}
defer_mangling_aliases = false;
}
/* Record a mangling of DECL, whose DECL_ASSEMBLER_NAME has just been
set. NEED_WARNING is true if we must warn about collisions. We do
this to spot changes in mangling that may require compatibility
aliases. */
void
record_mangling (tree decl, bool need_warning)
{
if (!mangled_decls)
mangled_decls = hash_table::create_ggc (499);
gcc_checking_assert (DECL_ASSEMBLER_NAME_SET_P (decl));
tree id = DECL_ASSEMBLER_NAME_RAW (decl);
tree *slot
= mangled_decls->find_slot_with_hash (id, IDENTIFIER_HASH_VALUE (id),
INSERT);
/* If this is already an alias, remove the alias, because the real
decl takes precedence. */
if (*slot && DECL_ARTIFICIAL (*slot) && DECL_IGNORED_P (*slot))
if (symtab_node *n = symtab_node::get (*slot))
if (n->cpp_implicit_alias)
{
n->remove ();
*slot = NULL_TREE;
}
if (!*slot)
*slot = decl;
else if (need_warning)
{
error_at (DECL_SOURCE_LOCATION (decl),
"mangling of %q#D as %qE conflicts with a previous mangle",
decl, id);
inform (DECL_SOURCE_LOCATION (*slot),
"previous mangling %q#D", *slot);
inform (DECL_SOURCE_LOCATION (decl),
"a later %<-fabi-version=%> (or =0)"
" avoids this error with a change in mangling");
*slot = decl;
}
}
/* The mangled name of DECL is being forcibly changed to NAME. Remove
any existing knowledge of DECL's mangled name meaning DECL. */
void
overwrite_mangling (tree decl, tree name)
{
if (tree id = DECL_ASSEMBLER_NAME_RAW (decl))
if ((TREE_CODE (decl) == VAR_DECL
|| TREE_CODE (decl) == FUNCTION_DECL)
&& mangled_decls)
if (tree *slot
= mangled_decls->find_slot_with_hash (id, IDENTIFIER_HASH_VALUE (id),
NO_INSERT))
if (*slot == decl)
{
mangled_decls->clear_slot (slot);
/* If this is an alias, remove it from the symbol table. */
if (DECL_ARTIFICIAL (decl) && DECL_IGNORED_P (decl))
if (symtab_node *n = symtab_node::get (decl))
if (n->cpp_implicit_alias)
n->remove ();
}
DECL_ASSEMBLER_NAME_RAW (decl) = name;
}
/* The entire file is now complete. If requested, dump everything
to a file. */
static void
dump_tu (void)
{
dump_flags_t flags;
if (FILE *stream = dump_begin (raw_dump_id, &flags))
{
dump_node (global_namespace, flags & ~TDF_SLIM, stream);
dump_end (raw_dump_id, stream);
}
}
static location_t locus_at_end_of_parsing;
/* Check the deallocation functions for CODE to see if we want to warn that
only one was defined. */
static void
maybe_warn_sized_delete (enum tree_code code)
{
tree sized = NULL_TREE;
tree unsized = NULL_TREE;
for (ovl_iterator iter (get_global_binding (ovl_op_identifier (false, code)));
iter; ++iter)
{
tree fn = *iter;
/* We're only interested in usual deallocation functions. */
if (!usual_deallocation_fn_p (fn))
continue;
if (FUNCTION_ARG_CHAIN (fn) == void_list_node)
unsized = fn;
else
sized = fn;
}
if (DECL_INITIAL (unsized) && !DECL_INITIAL (sized))
warning_at (DECL_SOURCE_LOCATION (unsized), OPT_Wsized_deallocation,
"the program should also define %qD", sized);
else if (!DECL_INITIAL (unsized) && DECL_INITIAL (sized))
warning_at (DECL_SOURCE_LOCATION (sized), OPT_Wsized_deallocation,
"the program should also define %qD", unsized);
}
/* Check the global deallocation functions to see if we want to warn about
defining unsized without sized (or vice versa). */
static void
maybe_warn_sized_delete ()
{
if (!flag_sized_deallocation || !warn_sized_deallocation)
return;
maybe_warn_sized_delete (DELETE_EXPR);
maybe_warn_sized_delete (VEC_DELETE_EXPR);
}
/* Earlier we left PTRMEM_CST in variable initializers alone so that we could
look them up when evaluating non-type template parameters. Now we need to
lower them to something the back end can understand. */
static void
lower_var_init ()
{
varpool_node *node;
FOR_EACH_VARIABLE (node)
{
tree d = node->decl;
if (tree init = DECL_INITIAL (d))
DECL_INITIAL (d) = cplus_expand_constant (init);
}
}
/* This routine is called at the end of compilation.
Its job is to create all the code needed to initialize and
destroy the global aggregates. We do the destruction
first, since that way we only need to reverse the decls once. */
void
c_parse_final_cleanups (void)
{
size_t i;
tree decl;
locus_at_end_of_parsing = input_location;
at_eof = 1;
/* Bad parse errors. Just forget about it. */
if (! global_bindings_p () || current_class_type
|| !vec_safe_is_empty (decl_namespace_list))
return;
/* This is the point to write out a PCH if we're doing that.
In that case we do not want to do anything else. */
if (pch_file)
{
/* Mangle all symbols at PCH creation time. */
symtab_node *node;
FOR_EACH_SYMBOL (node)
if (! is_a (node)
|| ! DECL_HARD_REGISTER (node->decl))
DECL_ASSEMBLER_NAME (node->decl);
c_common_write_pch ();
dump_tu ();
/* Ensure even the callers don't try to finalize the CU. */
flag_syntax_only = 1;
return;
}
timevar_stop (TV_PHASE_PARSING);
timevar_start (TV_PHASE_DEFERRED);
symtab->process_same_body_aliases ();
/* Handle -fdump-ada-spec[-slim] */
if (flag_dump_ada_spec || flag_dump_ada_spec_slim)
{
collect_source_ref (main_input_filename);
if (!flag_dump_ada_spec_slim)
collect_source_refs (global_namespace);
dump_ada_specs (collect_all_refs, cpp_check);
}
/* FIXME - huh? was input_line -= 1;*/
/* We now have to write out all the stuff we put off writing out.
These include:
o Template specializations that we have not yet instantiated,
but which are needed.
o Initialization and destruction for non-local objects with
static storage duration. (Local objects with static storage
duration are initialized when their scope is first entered,
and are cleaned up via atexit.)
o Virtual function tables.
All of these may cause others to be needed. For example,
instantiating one function may cause another to be needed, and
generating the initializer for an object may cause templates to be
instantiated, etc., etc. */
emit_support_tinfos ();
/* Track vtables we want to emit that refer to consteval functions. */
auto_vec consteval_vtables;
int retries = 0;
unsigned ssdf_count = 0;
for (bool reconsider = true; reconsider; retries++)
{
reconsider = false;
/* If there are templates that we've put off instantiating, do
them now. */
instantiate_pending_templates (retries);
ggc_collect ();
if (header_module_p ())
/* A header modules initializations are handled in its
importer. */
continue;
/* Write out virtual tables as required. 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. */
tree t;
for (i = keyed_classes->length ();
keyed_classes->iterate (--i, &t);)
if (maybe_emit_vtables (t, consteval_vtables))
{
reconsider = true;
keyed_classes->unordered_remove (i);
}
/* The input_location may have been changed during marking of
vtable entries. */
input_location = locus_at_end_of_parsing;
/* 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 = unemitted_tinfo_decls->length ();
unemitted_tinfo_decls->iterate (--i, &t);)
if (emit_tinfo_decl (t))
{
reconsider = true;
unemitted_tinfo_decls->unordered_remove (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. */
if (tree vars = prune_vars_needing_no_initialization (&static_aggregates))
{
if (flag_openmp)
/* Add initializer information from VARS into
DYNAMIC_INITIALIZERS. */
for (t = vars; t; t = TREE_CHAIN (t))
hash_map_safe_put (dynamic_initializers,
TREE_VALUE (t), TREE_PURPOSE (t));
/* Make sure the back end knows about all the variables. */
write_out_vars (vars);
function_depth++; // Disable GC
priority_map_t *parts[2] = {nullptr, nullptr};
partition_vars_for_init_fini (vars, parts);
for (unsigned initp = 2; initp--;)
if (parts[initp])
for (auto iter : *parts[initp])
{
auto list = iter.second;
if (initp)
// Partitioning kept the vars in reverse order.
// We only want that for dtors.
list = nreverse (list);
emit_partial_init_fini_fn (initp, iter.first, list,
ssdf_count++,
locus_at_end_of_parsing);
}
function_depth--; // Re-enable GC
/* All those initializations and finalizations might cause
us to need more inline functions, more template
instantiations, etc. */
reconsider = true;
}
/* Now do the same for thread_local variables. */
handle_tls_init ();
/* 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_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
{
/* Does it need synthesizing? */
if (DECL_DEFAULTED_FN (decl) && ! DECL_INITIAL (decl)
&& (! DECL_REALLY_EXTERN (decl) || possibly_inlined_p (decl)))
{
/* Even though we're already at the top-level, we push
there again. That way, when we pop back a few lines
hence, all of our state is restored. Otherwise,
finish_function doesn't clean things up, and we end
up with CURRENT_FUNCTION_DECL set. */
push_to_top_level ();
/* The decl's location will mark where it was first
needed. Save that so synthesize method can indicate
where it was needed from, in case of error */
input_location = DECL_SOURCE_LOCATION (decl);
synthesize_method (decl);
pop_from_top_level ();
reconsider = true;
}
if (!DECL_INITIAL (decl) && decl_tls_wrapper_p (decl))
generate_tls_wrapper (decl);
if (!DECL_SAVED_TREE (decl))
continue;
cgraph_node *node = cgraph_node::get_create (decl);
/* 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))
{
if (node->cpp_implicit_alias)
node = node->get_alias_target ();
node->call_for_symbol_thunks_and_aliases (clear_decl_external,
NULL, true);
/* If we mark !DECL_EXTERNAL one of the symbols in some comdat
group, we need to mark all symbols in the same comdat group
that way. */
if (node->same_comdat_group)
for (cgraph_node *next
= dyn_cast (node->same_comdat_group);
next != node;
next = dyn_cast (next->same_comdat_group))
next->call_for_symbol_thunks_and_aliases (clear_decl_external,
NULL, true);
}
/* 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)
&& !DECL_IMMEDIATE_FUNCTION_P (decl)
&& !node->definition)
{
/* 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);
reconsider = true;
}
}
if (wrapup_namespace_globals ())
reconsider = true;
/* Static data members are just like namespace-scope globals. */
FOR_EACH_VEC_SAFE_ELT (pending_statics, i, decl)
{
if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl)
/* Don't write it out if we haven't seen a definition. */
|| DECL_IN_AGGR_P (decl))
continue;
import_export_decl (decl);
/* If this static data member is needed, provide it to the
back end. */
if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
DECL_EXTERNAL (decl) = 0;
}
if (vec_safe_length (pending_statics) != 0
&& wrapup_global_declarations (pending_statics->address (),
pending_statics->length ()))
reconsider = true;
}
void *module_cookie = finish_module_processing (parse_in);
lower_var_init ();
generate_mangling_aliases ();
/* All used inline functions must have a definition at this point. */
FOR_EACH_VEC_SAFE_ELT (deferred_fns, i, decl)
{
if (/* Check online inline functions that were actually used. */
DECL_ODR_USED (decl) && DECL_DECLARED_INLINE_P (decl)
/* If the definition actually was available here, then the
fact that the function was not defined merely represents
that for some reason (use of a template repository,
#pragma interface, etc.) we decided not to emit the
definition here. */
&& !DECL_INITIAL (decl)
/* A defaulted fn in a header module can be synthesized on
demand later. (In non-header modules we should have
synthesized it above.) */
&& !(DECL_DEFAULTED_FN (decl) && header_module_p ())
/* Don't complain if the template was defined. */
&& !(DECL_TEMPLATE_INSTANTIATION (decl)
&& DECL_INITIAL (DECL_TEMPLATE_RESULT
(template_for_substitution (decl))))
&& warning_at (DECL_SOURCE_LOCATION (decl), 0,
"inline function %qD used but never defined", decl))
/* Avoid a duplicate warning from check_global_declaration. */
suppress_warning (decl, OPT_Wunused);
}
/* So must decls that use a type with no linkage. */
FOR_EACH_VEC_SAFE_ELT (no_linkage_decls, i, decl)
no_linkage_error (decl);
maybe_warn_sized_delete ();
// Place the init fns in the right order. We need to do this now,
// so that any module init will go at the start.
if (static_init_fini_fns[true])
for (auto iter : *static_init_fini_fns[true])
iter.second = nreverse (iter.second);
/* Then, do the Objective-C stuff. This is where all the
Objective-C module stuff gets generated (symtab,
class/protocol/selector lists etc). This must be done after C++
templates, destructors etc. so that selectors used in C++
templates are properly allocated. */
if (c_dialect_objc ())
objc_write_global_declarations ();
bool has_module_inits = module_determine_import_inits ();
bool has_objc_init = c_dialect_objc () && objc_static_init_needed_p ();
if (has_module_inits || has_objc_init)
{
input_location = locus_at_end_of_parsing;
tree body = start_partial_init_fini_fn (true, DEFAULT_INIT_PRIORITY,
ssdf_count++);
/* For Objective-C++, we may need to initialize metadata found
in this module. This must be done _before_ any other static
initializations. */
if (has_objc_init)
objc_generate_static_init_call (NULL_TREE);
if (has_module_inits)
module_add_import_initializers ();
input_location = locus_at_end_of_parsing;
finish_partial_init_fini_fn (body);
}
if (module_global_init_needed ())
{
// Make sure there's a default priority entry.
if (!static_init_fini_fns[true])
static_init_fini_fns[true] = priority_map_t::create_ggc ();
if (static_init_fini_fns[true]->get_or_insert (DEFAULT_INIT_PRIORITY))
has_module_inits = true;
}
/* Generate initialization and destruction functions for all
priorities for which they are required. They have C-language
linkage. */
push_lang_context (lang_name_c);
for (unsigned initp = 2; initp--;)
if (static_init_fini_fns[initp])
{
for (auto iter : *static_init_fini_fns[initp])
generate_ctor_or_dtor_function (initp, iter.first, iter.second,
locus_at_end_of_parsing);
static_init_fini_fns[initp] = nullptr;
}
pop_lang_context ();
fini_modules (parse_in, module_cookie, has_module_inits);
/* Generate any missing aliases. */
maybe_apply_pending_pragma_weaks ();
if (flag_vtable_verify)
{
vtv_recover_class_info ();
vtv_compute_class_hierarchy_transitive_closure ();
vtv_build_vtable_verify_fndecl ();
}
perform_deferred_noexcept_checks ();
fini_constexpr ();
cp_tree_c_finish_parsing ();
clear_consteval_vfns (consteval_vtables);
/* The entire file is now complete. If requested, dump everything
to a file. */
dump_tu ();
if (flag_detailed_statistics)
{
dump_tree_statistics ();
dump_time_statistics ();
}
timevar_stop (TV_PHASE_DEFERRED);
timevar_start (TV_PHASE_PARSING);
/* Indicate that we're done with front end processing. */
at_eof = 2;
}
/* Perform any post compilation-proper cleanups for the C++ front-end.
This should really go away. No front-end should need to do
anything past the compilation process. */
void
cxx_post_compilation_parsing_cleanups (void)
{
timevar_start (TV_PHASE_LATE_PARSING_CLEANUPS);
if (flag_vtable_verify)
{
/* Generate the special constructor initialization function that
calls __VLTRegisterPairs, and give it a very high
initialization priority. This must be done after
finalize_compilation_unit so that we have accurate
information about which vtable will actually be emitted. */
vtv_generate_init_routine ();
}
input_location = locus_at_end_of_parsing;
if (flag_checking)
validate_conversion_obstack ();
timevar_stop (TV_PHASE_LATE_PARSING_CLEANUPS);
}
/* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
function to call in parse-tree form; it has not yet been
semantically analyzed. ARGS are the arguments to the function.
They have already been semantically analyzed. This may change
ARGS. */
tree
build_offset_ref_call_from_tree (tree fn, vec **args,
tsubst_flags_t complain)
{
tree orig_fn;
vec *orig_args = NULL;
tree expr;
tree object;
orig_fn = fn;
object = TREE_OPERAND (fn, 0);
if (processing_template_decl)
{
gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
|| TREE_CODE (fn) == MEMBER_REF);
if (type_dependent_expression_p (fn)
|| any_type_dependent_arguments_p (*args))
return build_min_nt_call_vec (fn, *args);
orig_args = make_tree_vector_copy (*args);
/* Transform the arguments and add the implicit "this"
parameter. That must be done before the FN is transformed
because we depend on the form of FN. */
make_args_non_dependent (*args);
object = build_non_dependent_expr (object);
if (TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
{
if (TREE_CODE (fn) == DOTSTAR_EXPR)
object = cp_build_addr_expr (object, complain);
vec_safe_insert (*args, 0, object);
}
/* Now that the arguments are done, transform FN. */
fn = build_non_dependent_expr (fn);
}
/* A qualified name corresponding to a bound pointer-to-member is
represented as an OFFSET_REF:
struct B { void g(); };
void (B::*p)();
void B::g() { (this->*p)(); } */
if (TREE_CODE (fn) == OFFSET_REF)
{
tree object_addr = cp_build_addr_expr (object, complain);
fn = TREE_OPERAND (fn, 1);
fn = get_member_function_from_ptrfunc (&object_addr, fn,
complain);
vec_safe_insert (*args, 0, object_addr);
}
if (CLASS_TYPE_P (TREE_TYPE (fn)))
expr = build_op_call (fn, args, complain);
else
expr = cp_build_function_call_vec (fn, args, complain);
if (processing_template_decl && expr != error_mark_node)
expr = build_min_non_dep_call_vec (expr, orig_fn, orig_args);
if (orig_args != NULL)
release_tree_vector (orig_args);
return expr;
}
void
check_default_args (tree x)
{
tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
bool saw_def = false;
bool noted_first_def = false;
int idx_of_first_default_arg = 0;
location_t loc_of_first_default_arg = UNKNOWN_LOCATION;
int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
tree fndecl = STRIP_TEMPLATE (x);
auto_diagnostic_group d;
for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
{
if (TREE_PURPOSE (arg))
{
if (!saw_def)
{
saw_def = true;
idx_of_first_default_arg = i;
location_t loc = get_fndecl_argument_location (fndecl, i);
if (loc != DECL_SOURCE_LOCATION (x))
loc_of_first_default_arg = loc;
}
}
else if (saw_def && !PACK_EXPANSION_P (TREE_VALUE (arg)))
{
error_at (get_fndecl_argument_location (fndecl, i),
"default argument missing for parameter %P of %q#D", i, x);
if (loc_of_first_default_arg != UNKNOWN_LOCATION
&& !noted_first_def)
{
inform (loc_of_first_default_arg,
"...following parameter %P which has a default argument",
idx_of_first_default_arg);
noted_first_def = true;
}
TREE_PURPOSE (arg) = error_mark_node;
}
}
}
/* Return true if function DECL can be inlined. This is used to force
instantiation of methods that might be interesting for inlining. */
bool
possibly_inlined_p (tree decl)
{
gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
if (DECL_UNINLINABLE (decl))
return false;
if (!optimize)
return DECL_DECLARED_INLINE_P (decl);
/* When optimizing, we might inline everything when flatten
attribute or heuristics inlining for size or autoinlining
is used. */
return true;
}
/* If DECL is a function or variable template specialization, instantiate
its definition now. */
void
maybe_instantiate_decl (tree decl)
{
if (VAR_OR_FUNCTION_DECL_P (decl)
&& DECL_LANG_SPECIFIC (decl)
&& DECL_TEMPLATE_INFO (decl)
&& !DECL_DECLARED_CONCEPT_P (decl)
&& !uses_template_parms (DECL_TI_ARGS (decl)))
{
/* Instantiating a function will result in garbage collection. We
must treat this situation as if we were within the body of a
function so as to avoid collecting live data only referenced from
the stack (such as overload resolution candidates). */
++function_depth;
instantiate_decl (decl, /*defer_ok=*/false,
/*expl_inst_class_mem_p=*/false);
--function_depth;
}
}
/* Error if the DECL is unavailable (unless this is currently suppressed).
Maybe warn if DECL is deprecated, subject to COMPLAIN. Returns true if
an error or warning was emitted. */
bool
cp_handle_deprecated_or_unavailable (tree decl, tsubst_flags_t complain)
{
if (!decl)
return false;
if ((complain & tf_error)
&& deprecated_state != UNAVAILABLE_DEPRECATED_SUPPRESS)
{
if (TREE_UNAVAILABLE (decl))
{
error_unavailable_use (decl, NULL_TREE);
return true;
}
else
{
/* Perhaps this is an unavailable typedef. */
if (TYPE_P (decl)
&& TYPE_NAME (decl)
&& TREE_UNAVAILABLE (TYPE_NAME (decl)))
{
decl = TYPE_NAME (decl);
/* Don't error within members of a unavailable type. */
if (TYPE_P (decl)
&& currently_open_class (decl))
return false;
error_unavailable_use (decl, NULL_TREE);
return true;
}
}
/* Carry on to consider deprecatedness. */
}
if (!(complain & tf_warning)
|| deprecated_state == DEPRECATED_SUPPRESS
|| deprecated_state == UNAVAILABLE_DEPRECATED_SUPPRESS)
return false;
if (!TREE_DEPRECATED (decl))
{
/* Perhaps this is a deprecated typedef. */
if (TYPE_P (decl) && TYPE_NAME (decl))
decl = TYPE_NAME (decl);
if (!TREE_DEPRECATED (decl))
return false;
}
/* Don't warn within members of a deprecated type. */
if (TYPE_P (decl)
&& currently_open_class (decl))
return false;
bool warned = false;
if (cxx_dialect >= cxx11
&& DECL_P (decl)
&& DECL_ARTIFICIAL (decl)
&& DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
&& copy_fn_p (decl))
{
/* Don't warn if the flag was disabled around the class definition
(c++/94492). */
if (warning_enabled_at (DECL_SOURCE_LOCATION (decl),
OPT_Wdeprecated_copy))
{
auto_diagnostic_group d;
tree ctx = DECL_CONTEXT (decl);
tree other = classtype_has_depr_implicit_copy (ctx);
int opt = (DECL_DESTRUCTOR_P (other)
? OPT_Wdeprecated_copy_dtor
: OPT_Wdeprecated_copy);
warned = warning (opt, "implicitly-declared %qD is deprecated",
decl);
if (warned)
inform (DECL_SOURCE_LOCATION (other),
"because %qT has user-provided %qD",
ctx, other);
}
}
else
warned = warn_deprecated_use (decl, NULL_TREE);
return warned;
}
/* Like above, but takes into account outer scopes. */
void
cp_warn_deprecated_use_scopes (tree scope)
{
while (scope
&& scope != error_mark_node
&& scope != global_namespace)
{
if ((TREE_CODE (scope) == NAMESPACE_DECL || OVERLOAD_TYPE_P (scope))
&& cp_handle_deprecated_or_unavailable (scope))
return;
if (TYPE_P (scope))
scope = CP_TYPE_CONTEXT (scope);
else
scope = CP_DECL_CONTEXT (scope);
}
}
/* True if DECL or its enclosing scope have unbound template parameters. */
bool
decl_dependent_p (tree decl)
{
if (DECL_FUNCTION_SCOPE_P (decl)
|| TREE_CODE (decl) == CONST_DECL
|| TREE_CODE (decl) == USING_DECL
|| TREE_CODE (decl) == FIELD_DECL)
decl = CP_DECL_CONTEXT (decl);
if (tree tinfo = get_template_info (decl))
if (any_dependent_template_arguments_p (TI_ARGS (tinfo)))
return true;
if (LAMBDA_FUNCTION_P (decl)
&& dependent_type_p (DECL_CONTEXT (decl)))
return true;
return false;
}
/* [basic.def.odr] A function is named [and therefore odr-used] by an
expression or conversion if it is the selected member of an overload set in
an overload resolution performed as part of forming that expression or
conversion, unless it is a pure virtual function and either the expression
is not an id-expression naming the function with an explicitly qualified
name or the expression forms a pointer to member.
Mostly, we call mark_used in places that actually do something with a
function, like build_over_call. But in a few places we end up with a
non-overloaded FUNCTION_DECL that we aren't going to do any more with, like
convert_to_void. resolve_nondeduced_context is called in those places,
but it's also called in too many other places. */
bool
mark_single_function (tree expr, tsubst_flags_t complain)
{
expr = maybe_undo_parenthesized_ref (expr);
expr = tree_strip_any_location_wrapper (expr);
if (is_overloaded_fn (expr) == 1
&& !mark_used (expr, complain)
&& (complain & tf_error))
return false;
return true;
}
/* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
If DECL is a specialization or implicitly declared class member,
generate the actual definition. Return false if something goes
wrong, true otherwise. */
bool
mark_used (tree decl, tsubst_flags_t complain /* = tf_warning_or_error */)
{
/* If we're just testing conversions or resolving overloads, we
don't want any permanent effects like forcing functions to be
output or instantiating templates. */
if ((complain & tf_conv))
return true;
/* 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 (BASELINK_P (decl))
{
tree fns = BASELINK_FUNCTIONS (decl);
if (really_overloaded_fn (fns))
return true;
fns = OVL_FIRST (fns);
if (!mark_used (fns, complain))
return false;
/* We might have deduced its return type. */
TREE_TYPE (decl) = TREE_TYPE (fns);
return true;
}
if (!DECL_P (decl))
return true;
/* Set TREE_USED for the benefit of -Wunused. */
TREE_USED (decl) = true;
/* And for structured bindings also the underlying decl. */
if (DECL_DECOMPOSITION_P (decl) && DECL_DECOMP_BASE (decl))
TREE_USED (DECL_DECOMP_BASE (decl)) = true;
if (TREE_CODE (decl) == TEMPLATE_DECL)
return true;
if (DECL_CLONED_FUNCTION_P (decl))
TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
/* Mark enumeration types as used. */
if (TREE_CODE (decl) == CONST_DECL)
used_types_insert (DECL_CONTEXT (decl));
if (TREE_CODE (decl) == FUNCTION_DECL)
{
if (DECL_MAYBE_DELETED (decl))
{
++function_depth;
maybe_synthesize_method (decl);
--function_depth;
}
if (DECL_DELETED_FN (decl))
{
if (DECL_ARTIFICIAL (decl)
&& DECL_CONV_FN_P (decl)
&& LAMBDA_TYPE_P (DECL_CONTEXT (decl)))
/* We mark a lambda conversion op as deleted if we can't
generate it properly; see maybe_add_lambda_conv_op. */
sorry ("converting lambda that uses %<...%> to function pointer");
else if (complain & tf_error)
{
error ("use of deleted function %qD", decl);
if (!maybe_explain_implicit_delete (decl))
inform (DECL_SOURCE_LOCATION (decl), "declared here");
}
return false;
}
if (!maybe_instantiate_noexcept (decl, complain))
return false;
}
if (VAR_OR_FUNCTION_DECL_P (decl) && DECL_LOCAL_DECL_P (decl))
{
if (!DECL_LANG_SPECIFIC (decl))
/* An unresolved dependent local extern. */
return true;
DECL_ODR_USED (decl) = 1;
auto alias = DECL_LOCAL_DECL_ALIAS (decl);
if (!alias || alias == error_mark_node)
return true;
/* Process the underlying decl. */
decl = alias;
TREE_USED (decl) = true;
}
cp_handle_deprecated_or_unavailable (decl, complain);
/* We can only check DECL_ODR_USED on variables or functions with
DECL_LANG_SPECIFIC set, and these are also the only decls that we
might need special handling for. */
if (!VAR_OR_FUNCTION_DECL_P (decl)
|| DECL_LANG_SPECIFIC (decl) == NULL
|| DECL_THUNK_P (decl))
{
if (!decl_dependent_p (decl)
&& !require_deduced_type (decl, complain))
return false;
return true;
}
/* We only want to do this processing once. We don't need to keep trying
to instantiate inline templates, because unit-at-a-time will make sure
we get them compiled before functions that want to inline them. */
if (DECL_ODR_USED (decl))
return true;
if (flag_concepts && TREE_CODE (decl) == FUNCTION_DECL
&& !constraints_satisfied_p (decl))
{
if (complain & tf_error)
{
auto_diagnostic_group d;
error ("use of function %qD with unsatisfied constraints",
decl);
location_t loc = DECL_SOURCE_LOCATION (decl);
inform (loc, "declared here");
diagnose_constraints (loc, decl, NULL_TREE);
}
return false;
}
/* If DECL has a deduced return type, we need to instantiate it now to
find out its type. For OpenMP user defined reductions, we need them
instantiated for reduction clauses which inline them by hand directly. */
if (undeduced_auto_decl (decl)
|| (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_OMP_DECLARE_REDUCTION_P (decl)))
maybe_instantiate_decl (decl);
if (processing_template_decl || in_template_function ())
return true;
/* Check this too in case we're within instantiate_non_dependent_expr. */
if (DECL_TEMPLATE_INFO (decl)
&& uses_template_parms (DECL_TI_ARGS (decl)))
return true;
if (!require_deduced_type (decl, complain))
return false;
if (builtin_pack_fn_p (decl))
{
error ("use of built-in parameter pack %qD outside of a template",
DECL_NAME (decl));
return false;
}
/* If we don't need a value, then we don't need to synthesize DECL. */
if (cp_unevaluated_operand || in_discarded_stmt)
return true;
DECL_ODR_USED (decl) = 1;
if (DECL_CLONED_FUNCTION_P (decl))
DECL_ODR_USED (DECL_CLONED_FUNCTION (decl)) = 1;
/* DR 757: A type without linkage shall not be used as the type of a
variable or function with linkage, unless
o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
o the variable or function is not used (3.2 [basic.def.odr]) or is
defined in the same translation unit. */
if (cxx_dialect > cxx98
&& decl_linkage (decl) != lk_none
&& !DECL_EXTERN_C_P (decl)
&& !DECL_ARTIFICIAL (decl)
&& !decl_defined_p (decl)
&& no_linkage_check (TREE_TYPE (decl), /*relaxed_p=*/false))
vec_safe_push (no_linkage_decls, decl);
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl)
&& !DECL_INITIAL (decl)
&& !DECL_ARTIFICIAL (decl)
&& !DECL_PURE_VIRTUAL_P (decl))
/* Remember it, so we can check it was defined. */
note_vague_linkage_fn (decl);
/* Is it a synthesized method that needs to be synthesized? */
if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_DEFAULTED_FN (decl)
/* A function defaulted outside the class is synthesized either by
cp_finish_decl or instantiate_decl. */
&& !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl)
&& ! DECL_INITIAL (decl))
{
/* Defer virtual destructors so that thunks get the right
linkage. */
if (DECL_VIRTUAL_P (decl) && !at_eof)
{
note_vague_linkage_fn (decl);
return true;
}
/* 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_remember_implicit_trigger_p (decl))
DECL_SOURCE_LOCATION (decl) = input_location;
/* Synthesizing an implicitly defined member function will result in
garbage collection. We must treat this situation as if we were
within the body of a function so as to avoid collecting live data
on the stack (such as overload resolution candidates).
We could just let c_parse_final_cleanups handle synthesizing
this function by adding it to deferred_fns, but doing
it at the use site produces better error messages. */
++function_depth;
synthesize_method (decl);
--function_depth;
/* If this is a synthesized method we don't need to
do the instantiation test below. */
}
else if (VAR_OR_FUNCTION_DECL_P (decl)
&& DECL_TEMPLATE_INFO (decl)
&& !DECL_DECLARED_CONCEPT_P (decl)
&& (!DECL_EXPLICIT_INSTANTIATION (decl)
|| always_instantiate_p (decl)))
/* If this is a function or variable that is an instance of some
template, we now know that we will need to actually do the
instantiation. We check that DECL is not an explicit
instantiation because that is not checked in instantiate_decl.
We put off instantiating functions in order to improve compile
times. Maintaining a stack of active functions is expensive,
and the inliner knows to instantiate any functions it might
need. Therefore, we always try to defer instantiation. */
{
++function_depth;
instantiate_decl (decl, /*defer_ok=*/true,
/*expl_inst_class_mem_p=*/false);
--function_depth;
}
return true;
}
tree
vtv_start_verification_constructor_init_function (void)
{
return start_objects (/*initp=*/true, MAX_RESERVED_INIT_PRIORITY - 1, true);
}
tree
vtv_finish_verification_constructor_init_function (tree body)
{
return finish_objects (/*initp=*/true, MAX_RESERVED_INIT_PRIORITY - 1, body);
}
#include "gt-cp-decl2.h"