blob: 79b977ffd919d6f917db68bdd77921b2ed15855a [file] [log] [blame]
/* Process declarations and variables for C++ compiler.
Copyright (C) 1988-2021 Free Software Foundation, Inc.
Hacked by Michael Tiemann (tiemann@cygnus.com)
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Process declarations and symbol lookup for C++ front end.
Also constructs types; the standard scalar types at initialization,
and structure, union, array and enum types when they are declared. */
/* ??? not all decl nodes are given the most useful possible
line numbers. For example, the CONST_DECLs for enum values. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "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"
/* Id for dumping the raw trees. */
int raw_dump_id;
extern cpp_reader *parse_in;
/* This structure contains information about the initializations
and/or destructions required for a particular priority level. */
typedef struct priority_info_s {
/* Nonzero if there have been any initializations at this priority
throughout the translation unit. */
int initializations_p;
/* Nonzero if there have been any destructions at this priority
throughout the translation unit. */
int destructions_p;
} *priority_info;
static tree start_objects (int, int);
static void finish_objects (int, int, tree);
static tree start_static_storage_duration_function (unsigned);
static void finish_static_storage_duration_function (tree);
static priority_info get_priority_info (int);
static void do_static_initialization_or_destruction (tree, bool);
static void one_static_initialization_or_destruction (tree, tree, bool);
static void generate_ctor_or_dtor_function (bool, int, location_t *);
static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
void *);
static tree prune_vars_needing_no_initialization (tree *);
static void write_out_vars (tree);
static void import_export_class (tree);
static tree get_guard_bits (tree);
static void determine_visibility_from_class (tree, tree);
static bool 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<tree, va_gc> *pending_statics;
/* A list of functions which were declared inline, but which we
may need to emit outline anyway. */
static GTY(()) vec<tree, va_gc> *deferred_fns;
/* A list of decls that use types with no linkage, which we need to make
sure are defined. */
static GTY(()) vec<tree, va_gc> *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<tree, va_gc> *mangling_aliases;
/* hash traits for declarations. Hashes single decls via
DECL_ASSEMBLER_NAME_RAW. */
struct mangled_decl_hash : ggc_remove <tree>
{
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 <value_type> (1);
}
static void mark_deleted (value_type &e)
{
e = reinterpret_cast <value_type> (1);
}
};
/* A hash table of decls keyed by mangled name. Used to figure out if
we need compatibility aliases. */
static GTY(()) hash_table<mangled_decl_hash> *mangled_decls;
/* 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 ("<anonymous>");
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. DECLTYPE_P is for N3276, as in the parser. */
tree
grok_array_decl (location_t loc, tree array_expr, tree index_exp,
bool decltype_p)
{
tree type;
tree expr;
tree orig_array_expr = array_expr;
tree orig_index_exp = index_exp;
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)
|| type_dependent_expression_p (index_exp))
return build_min_nt_loc (loc, ARRAY_REF, array_expr, index_exp,
NULL_TREE, NULL_TREE);
array_expr = build_non_dependent_expr (array_expr);
index_exp = build_non_dependent_expr (index_exp);
}
type = TREE_TYPE (array_expr);
gcc_assert (type);
type = non_reference (type);
/* If they have an `operator[]', use that. */
if (MAYBE_CLASS_TYPE_P (type) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp)))
{
tsubst_flags_t complain = tf_warning_or_error;
if (decltype_p)
complain |= tf_decltype;
expr = build_new_op (loc, ARRAY_REF, LOOKUP_NORMAL, array_expr,
index_exp, NULL_TREE, &overload, complain);
}
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 (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)
return (build_min_non_dep_op_overload
(ARRAY_REF, expr, overload, orig_array_expr, orig_index_exp));
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 %<delete%>, expected pointer",
TREE_TYPE (exp));
return error_mark_node;
}
type = TREE_TYPE (t);
/* As of Valley Forge, you can delete a pointer to const. */
/* You can't delete functions. */
if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
{
if (complain & tf_error)
error_at (exp_loc,
"cannot delete a function. Only pointer-to-objects are "
"valid arguments to %<delete%>");
return error_mark_node;
}
/* Deleting ptr to void is undefined behavior [expr.delete/3]. */
if (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 <typename T> void f(T); };
template <> void S::f(int);
we're not going to find `S::f(int)', but there's no
reason we should, either. We let our callers know we didn't
find the method, but we don't complain. */
return NULL_TREE;
/* Basic sanity check: for a template function, the template parameters
either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
if (TREE_CODE (function) == TEMPLATE_DECL)
{
if (template_parms
&& !comp_template_parms (template_parms,
DECL_TEMPLATE_PARMS (function)))
{
error ("template parameter lists provided don%'t match the "
"template parameters of %qD", function);
return error_mark_node;
}
template_parms = DECL_TEMPLATE_PARMS (function);
}
/* OK, is this a definition of a member template? */
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));
for (ovl_iterator iter (fns); !matched && iter; ++iter)
{
tree fndecl = *iter;
/* 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)
{
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 ("%<asm%> specifiers are not permitted on non-static data members");
if (DECL_INITIAL (value) == error_mark_node)
init = error_mark_node;
cp_finish_decl (value, init, /*init_const_expr_p=*/false,
NULL_TREE, flags);
DECL_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 %<warn_if_not_aligned%> 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);
/* 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 ("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)
return NULL_TREE;
for (; *p; )
{
if (is_late_template_attribute (*p, decl))
{
ATTR_IS_DEPENDENT (*p) = 1;
*q = *p;
*p = TREE_CHAIN (*p);
q = &TREE_CHAIN (*q);
*q = NULL_TREE;
}
else
p = &TREE_CHAIN (*p);
}
return late_attrs;
}
/* Remove any late attributes from the list in ATTR_P and attach them to
DECL_P. */
static void
save_template_attributes (tree *attr_p, tree *decl_p, int flags)
{
tree *q;
if (attr_p && *attr_p == error_mark_node)
return;
tree late_attrs = splice_template_attributes (attr_p, *decl_p);
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))
{
if (cxx_contract_attribute_p (attr))
continue;
tree arg;
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);
}
}
}
/* Return true if TYPE is an OpenMP mappable type.
If NOTES is non-zero, emit a note message for each problem. */
static bool
cp_omp_mappable_type_1 (tree type, bool notes)
{
bool result = true;
/* Mappable type has to be complete. */
if (type == error_mark_node || !COMPLETE_TYPE_P (type))
{
if (notes && type != error_mark_node)
{
tree decl = TYPE_MAIN_DECL (type);
inform ((decl ? DECL_SOURCE_LOCATION (decl) : input_location),
"incomplete type %qT is not mappable", type);
}
result = false;
}
/* Arrays have mappable type if the elements have mappable type. */
while (TREE_CODE (type) == ARRAY_TYPE)
type = TREE_TYPE (type);
/* A mappable type cannot contain virtual members. */
if (CLASS_TYPE_P (type) && CLASSTYPE_VTABLES (type))
{
if (notes)
inform (DECL_SOURCE_LOCATION (TYPE_MAIN_DECL (type)),
"type %qT with virtual members is not mappable", type);
result = false;
}
/* All data members must be non-static. */
if (CLASS_TYPE_P (type))
{
tree field;
for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
if (VAR_P (field))
{
if (notes)
inform (DECL_SOURCE_LOCATION (field),
"static field %qD is not mappable", field);
result = false;
}
/* All fields must have mappable types. */
else if (TREE_CODE (field) == FIELD_DECL
&& !cp_omp_mappable_type_1 (TREE_TYPE (field), notes))
result = false;
}
return result;
}
/* Return true if TYPE is an OpenMP mappable type. */
bool
cp_omp_mappable_type (tree type)
{
return cp_omp_mappable_type_1 (type, false);
}
/* Return true if TYPE is an OpenMP mappable type.
Emit an error messages if not. */
bool
cp_omp_emit_unmappable_type_notes (tree type)
{
return cp_omp_mappable_type_1 (type, true);
}
/* 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;
if (decls_match (decl, *iter, /*record_decls=*/false))
return *iter;
}
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)
return;
/* Add implicit "omp declare target" attribute if requested. */
if (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
|| !cp_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 (processing_template_decl)
{
if (check_for_bare_parameter_packs (attributes))
return;
save_template_attributes (&attributes, decl, flags);
}
cp_check_const_attributes (attributes);
if ((flag_openmp || flag_openmp_simd) && attributes != error_mark_node)
{
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 ("%<omp::%E%> 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);
}
/* 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;
}
}
/* 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, "%<operator new%> must return type %qT",
ptr_type_node);
}
if (args && args != void_list_node)
{
if (TREE_PURPOSE (args))
{
/* [basic.stc.dynamic.allocation]
The first parameter shall not have an associated default
argument. */
error_at (loc, "the first parameter of %<operator new%> cannot "
"have a default argument");
/* Throw away the default argument. */
TREE_PURPOSE (args) = NULL_TREE;
}
if (!same_type_p (TREE_VALUE (args), size_type_node))
{
e = 2;
args = TREE_CHAIN (args);
}
}
else
e = 2;
if (e == 2)
permerror (loc, "%<operator new%> takes type %<size_t%> (%qT) "
"as first parameter", size_type_node);
switch (e)
{
case 2:
args = tree_cons (NULL_TREE, size_type_node, args);
/* Fall through. */
case 1:
type = (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, "%<operator delete%> 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 %<operator delete%> 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, "%<operator delete[]%> cannot be a destroying delete");
if (!usual_deallocation_fn_p (decl))
error_at (loc, "destroying %<operator delete%> 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, "%<operator delete%> 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<tree> &consteval_vtables)
{
tree fnaddr;
unsigned HOST_WIDE_INT idx;
/* It's OK for the vtable to refer to deprecated virtual functions. */
warning_sentinel w(warn_deprecated_decl);
bool consteval_seen = false;
FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
idx, fnaddr)
{
tree fn;
STRIP_NOPS (fnaddr);
if (TREE_CODE (fnaddr) != ADDR_EXPR
&& TREE_CODE (fnaddr) != FDESC_EXPR)
/* This entry is an offset: a virtual base class offset, a
virtual call offset, an RTTI offset, etc. */
continue;
fn = TREE_OPERAND (fnaddr, 0);
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<tree> &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));
if (HAVE_COMDAT_GROUP && flag_contracts && DECL_CONTRACTS (decl))
{
symtab_node *n = symtab_node::get (decl);
if (tree pre = DECL_PRE_FN (decl))
cgraph_node::get_create (pre)->add_to_same_comdat_group (n);
if (tree post = DECL_POST_FN (decl))
cgraph_node::get_create (post)->add_to_same_comdat_group (n);
}
}
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<tree> &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<tree, va_gc> *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.c'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_anon_ns_mem_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 %qD 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
warning (OPT_Wsubobject_linkage, "\
%qT has a field %qD whose type uses the anonymous namespace",
type, t);
}
}
else