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/* C-family attributes handling.
Copyright (C) 1992-2017 Free Software Foundation, Inc.
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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "function.h"
#include "tree.h"
#include "memmodel.h"
#include "c-common.h"
#include "gimple-expr.h"
#include "tm_p.h"
#include "stringpool.h"
#include "cgraph.h"
#include "diagnostic.h"
#include "intl.h"
#include "stor-layout.h"
#include "calls.h"
#include "attribs.h"
#include "varasm.h"
#include "trans-mem.h"
#include "c-objc.h"
#include "common/common-target.h"
#include "langhooks.h"
#include "tree-inline.h"
#include "toplev.h"
#include "tree-iterator.h"
#include "opts.h"
#include "gimplify.h"
static tree handle_packed_attribute (tree *, tree, tree, int, bool *);
static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *);
static tree handle_common_attribute (tree *, tree, tree, int, bool *);
static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
static tree handle_hot_attribute (tree *, tree, tree, int, bool *);
static tree handle_cold_attribute (tree *, tree, tree, int, bool *);
static tree handle_no_sanitize_address_attribute (tree *, tree, tree,
int, bool *);
static tree handle_no_address_safety_analysis_attribute (tree *, tree, tree,
int, bool *);
static tree handle_no_sanitize_undefined_attribute (tree *, tree, tree, int,
bool *);
static tree handle_asan_odr_indicator_attribute (tree *, tree, tree, int,
bool *);
static tree handle_stack_protect_attribute (tree *, tree, tree, int, bool *);
static tree handle_noinline_attribute (tree *, tree, tree, int, bool *);
static tree handle_noclone_attribute (tree *, tree, tree, int, bool *);
static tree handle_noicf_attribute (tree *, tree, tree, int, bool *);
static tree handle_leaf_attribute (tree *, tree, tree, int, bool *);
static tree handle_always_inline_attribute (tree *, tree, tree, int,
bool *);
static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *);
static tree handle_artificial_attribute (tree *, tree, tree, int, bool *);
static tree handle_flatten_attribute (tree *, tree, tree, int, bool *);
static tree handle_error_attribute (tree *, tree, tree, int, bool *);
static tree handle_used_attribute (tree *, tree, tree, int, bool *);
static tree handle_externally_visible_attribute (tree *, tree, tree, int,
bool *);
static tree handle_no_reorder_attribute (tree *, tree, tree, int,
bool *);
static tree handle_const_attribute (tree *, tree, tree, int, bool *);
static tree handle_transparent_union_attribute (tree *, tree, tree,
int, bool *);
static tree handle_scalar_storage_order_attribute (tree *, tree, tree,
int, bool *);
static tree handle_constructor_attribute (tree *, tree, tree, int, bool *);
static tree handle_destructor_attribute (tree *, tree, tree, int, bool *);
static tree handle_mode_attribute (tree *, tree, tree, int, bool *);
static tree handle_section_attribute (tree *, tree, tree, int, bool *);
static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ;
static tree handle_noplt_attribute (tree *, tree, tree, int, bool *) ;
static tree handle_alias_ifunc_attribute (bool, tree *, tree, tree, bool *);
static tree handle_ifunc_attribute (tree *, tree, tree, int, bool *);
static tree handle_alias_attribute (tree *, tree, tree, int, bool *);
static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ;
static tree handle_visibility_attribute (tree *, tree, tree, int,
bool *);
static tree handle_tls_model_attribute (tree *, tree, tree, int,
bool *);
static tree handle_no_instrument_function_attribute (tree *, tree,
tree, int, bool *);
static tree handle_no_profile_instrument_function_attribute (tree *, tree,
tree, int, bool *);
static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *);
static tree handle_no_limit_stack_attribute (tree *, tree, tree, int,
bool *);
static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
static tree handle_tm_attribute (tree *, tree, tree, int, bool *);
static tree handle_tm_wrap_attribute (tree *, tree, tree, int, bool *);
static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
static tree handle_deprecated_attribute (tree *, tree, tree, int,
bool *);
static tree handle_vector_size_attribute (tree *, tree, tree, int,
bool *);
static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *);
static tree handle_warn_unused_result_attribute (tree *, tree, tree, int,
bool *);
static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *);
static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *);
static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_attribute (tree *, tree, tree, int, bool *);
static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *);
static tree handle_optimize_attribute (tree *, tree, tree, int, bool *);
static tree ignore_attribute (tree *, tree, tree, int, bool *);
static tree handle_no_split_stack_attribute (tree *, tree, tree, int, bool *);
static tree handle_fnspec_attribute (tree *, tree, tree, int, bool *);
static tree handle_warn_unused_attribute (tree *, tree, tree, int, bool *);
static tree handle_returns_nonnull_attribute (tree *, tree, tree, int, bool *);
static tree handle_omp_declare_simd_attribute (tree *, tree, tree, int,
bool *);
static tree handle_simd_attribute (tree *, tree, tree, int, bool *);
static tree handle_omp_declare_target_attribute (tree *, tree, tree, int,
bool *);
static tree handle_designated_init_attribute (tree *, tree, tree, int, bool *);
static tree handle_bnd_variable_size_attribute (tree *, tree, tree, int, bool *);
static tree handle_bnd_legacy (tree *, tree, tree, int, bool *);
static tree handle_bnd_instrument (tree *, tree, tree, int, bool *);
static tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *);
/* Table of machine-independent attributes common to all C-like languages.
All attributes referencing arguments should be additionally processed
in chkp_copy_function_type_adding_bounds for correct instrumentation
by Pointer Bounds Checker.
Current list of processed common attributes: nonnull. */
const struct attribute_spec c_common_attribute_table[] =
{
/* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
affects_type_identity } */
{ "packed", 0, 0, false, false, false,
handle_packed_attribute , false},
{ "nocommon", 0, 0, true, false, false,
handle_nocommon_attribute, false},
{ "common", 0, 0, true, false, false,
handle_common_attribute, false },
/* FIXME: logically, noreturn attributes should be listed as
"false, true, true" and apply to function types. But implementing this
would require all the places in the compiler that use TREE_THIS_VOLATILE
on a decl to identify non-returning functions to be located and fixed
to check the function type instead. */
{ "noreturn", 0, 0, true, false, false,
handle_noreturn_attribute, false },
{ "volatile", 0, 0, true, false, false,
handle_noreturn_attribute, false },
{ "stack_protect", 0, 0, true, false, false,
handle_stack_protect_attribute, false },
{ "noinline", 0, 0, true, false, false,
handle_noinline_attribute, false },
{ "noclone", 0, 0, true, false, false,
handle_noclone_attribute, false },
{ "no_icf", 0, 0, true, false, false,
handle_noicf_attribute, false },
{ "leaf", 0, 0, true, false, false,
handle_leaf_attribute, false },
{ "always_inline", 0, 0, true, false, false,
handle_always_inline_attribute, false },
{ "gnu_inline", 0, 0, true, false, false,
handle_gnu_inline_attribute, false },
{ "artificial", 0, 0, true, false, false,
handle_artificial_attribute, false },
{ "flatten", 0, 0, true, false, false,
handle_flatten_attribute, false },
{ "used", 0, 0, true, false, false,
handle_used_attribute, false },
{ "unused", 0, 0, false, false, false,
handle_unused_attribute, false },
{ "externally_visible", 0, 0, true, false, false,
handle_externally_visible_attribute, false },
{ "no_reorder", 0, 0, true, false, false,
handle_no_reorder_attribute, false },
/* The same comments as for noreturn attributes apply to const ones. */
{ "const", 0, 0, true, false, false,
handle_const_attribute, false },
{ "scalar_storage_order", 1, 1, false, false, false,
handle_scalar_storage_order_attribute, false },
{ "transparent_union", 0, 0, false, false, false,
handle_transparent_union_attribute, false },
{ "constructor", 0, 1, true, false, false,
handle_constructor_attribute, false },
{ "destructor", 0, 1, true, false, false,
handle_destructor_attribute, false },
{ "mode", 1, 1, false, true, false,
handle_mode_attribute, false },
{ "section", 1, 1, true, false, false,
handle_section_attribute, false },
{ "aligned", 0, 1, false, false, false,
handle_aligned_attribute, false },
{ "weak", 0, 0, true, false, false,
handle_weak_attribute, false },
{ "noplt", 0, 0, true, false, false,
handle_noplt_attribute, false },
{ "ifunc", 1, 1, true, false, false,
handle_ifunc_attribute, false },
{ "alias", 1, 1, true, false, false,
handle_alias_attribute, false },
{ "weakref", 0, 1, true, false, false,
handle_weakref_attribute, false },
{ "no_instrument_function", 0, 0, true, false, false,
handle_no_instrument_function_attribute,
false },
{ "no_profile_instrument_function", 0, 0, true, false, false,
handle_no_profile_instrument_function_attribute,
false },
{ "malloc", 0, 0, true, false, false,
handle_malloc_attribute, false },
{ "returns_twice", 0, 0, true, false, false,
handle_returns_twice_attribute, false },
{ "no_stack_limit", 0, 0, true, false, false,
handle_no_limit_stack_attribute, false },
{ "pure", 0, 0, true, false, false,
handle_pure_attribute, false },
{ "transaction_callable", 0, 0, false, true, false,
handle_tm_attribute, false },
{ "transaction_unsafe", 0, 0, false, true, false,
handle_tm_attribute, true },
{ "transaction_safe", 0, 0, false, true, false,
handle_tm_attribute, true },
{ "transaction_safe_dynamic", 0, 0, true, false, false,
handle_tm_attribute, false },
{ "transaction_may_cancel_outer", 0, 0, false, true, false,
handle_tm_attribute, false },
/* ??? These two attributes didn't make the transition from the
Intel language document to the multi-vendor language document. */
{ "transaction_pure", 0, 0, false, true, false,
handle_tm_attribute, false },
{ "transaction_wrap", 1, 1, true, false, false,
handle_tm_wrap_attribute, false },
/* For internal use (marking of builtins) only. The name contains space
to prevent its usage in source code. */
{ "no vops", 0, 0, true, false, false,
handle_novops_attribute, false },
{ "deprecated", 0, 1, false, false, false,
handle_deprecated_attribute, false },
{ "vector_size", 1, 1, false, true, false,
handle_vector_size_attribute, true },
{ "visibility", 1, 1, false, false, false,
handle_visibility_attribute, false },
{ "tls_model", 1, 1, true, false, false,
handle_tls_model_attribute, false },
{ "nonnull", 0, -1, false, true, true,
handle_nonnull_attribute, false },
{ "nothrow", 0, 0, true, false, false,
handle_nothrow_attribute, false },
{ "may_alias", 0, 0, false, true, false, NULL, false },
{ "cleanup", 1, 1, true, false, false,
handle_cleanup_attribute, false },
{ "warn_unused_result", 0, 0, false, true, true,
handle_warn_unused_result_attribute, false },
{ "sentinel", 0, 1, false, true, true,
handle_sentinel_attribute, false },
/* For internal use (marking of builtins) only. The name contains space
to prevent its usage in source code. */
{ "type generic", 0, 0, false, true, true,
handle_type_generic_attribute, false },
{ "alloc_size", 1, 2, false, true, true,
handle_alloc_size_attribute, false },
{ "cold", 0, 0, true, false, false,
handle_cold_attribute, false },
{ "hot", 0, 0, true, false, false,
handle_hot_attribute, false },
{ "no_address_safety_analysis",
0, 0, true, false, false,
handle_no_address_safety_analysis_attribute,
false },
{ "no_sanitize_address", 0, 0, true, false, false,
handle_no_sanitize_address_attribute,
false },
{ "no_sanitize_thread", 0, 0, true, false, false,
handle_no_sanitize_address_attribute,
false },
{ "no_sanitize_undefined", 0, 0, true, false, false,
handle_no_sanitize_undefined_attribute,
false },
{ "asan odr indicator", 0, 0, true, false, false,
handle_asan_odr_indicator_attribute,
false },
{ "warning", 1, 1, true, false, false,
handle_error_attribute, false },
{ "error", 1, 1, true, false, false,
handle_error_attribute, false },
{ "target", 1, -1, true, false, false,
handle_target_attribute, false },
{ "target_clones", 1, -1, true, false, false,
handle_target_clones_attribute, false },
{ "optimize", 1, -1, true, false, false,
handle_optimize_attribute, false },
/* For internal use only. The leading '*' both prevents its usage in
source code and signals that it may be overridden by machine tables. */
{ "*tm regparm", 0, 0, false, true, true,
ignore_attribute, false },
{ "no_split_stack", 0, 0, true, false, false,
handle_no_split_stack_attribute, false },
/* For internal use (marking of builtins and runtime functions) only.
The name contains space to prevent its usage in source code. */
{ "fn spec", 1, 1, false, true, true,
handle_fnspec_attribute, false },
{ "warn_unused", 0, 0, false, false, false,
handle_warn_unused_attribute, false },
{ "returns_nonnull", 0, 0, false, true, true,
handle_returns_nonnull_attribute, false },
{ "omp declare simd", 0, -1, true, false, false,
handle_omp_declare_simd_attribute, false },
{ "cilk simd function", 0, -1, true, false, false,
handle_omp_declare_simd_attribute, false },
{ "simd", 0, 1, true, false, false,
handle_simd_attribute, false },
{ "omp declare target", 0, 0, true, false, false,
handle_omp_declare_target_attribute, false },
{ "omp declare target link", 0, 0, true, false, false,
handle_omp_declare_target_attribute, false },
{ "alloc_align", 1, 1, false, true, true,
handle_alloc_align_attribute, false },
{ "assume_aligned", 1, 2, false, true, true,
handle_assume_aligned_attribute, false },
{ "designated_init", 0, 0, false, true, false,
handle_designated_init_attribute, false },
{ "bnd_variable_size", 0, 0, true, false, false,
handle_bnd_variable_size_attribute, false },
{ "bnd_legacy", 0, 0, true, false, false,
handle_bnd_legacy, false },
{ "bnd_instrument", 0, 0, true, false, false,
handle_bnd_instrument, false },
{ "fallthrough", 0, 0, false, false, false,
handle_fallthrough_attribute, false },
{ NULL, 0, 0, false, false, false, NULL, false }
};
/* Give the specifications for the format attributes, used by C and all
descendants.
All attributes referencing arguments should be additionally processed
in chkp_copy_function_type_adding_bounds for correct instrumentation
by Pointer Bounds Checker.
Current list of processed format attributes: format, format_arg. */
const struct attribute_spec c_common_format_attribute_table[] =
{
/* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
affects_type_identity } */
{ "format", 3, 3, false, true, true,
handle_format_attribute, false },
{ "format_arg", 1, 1, false, true, true,
handle_format_arg_attribute, false },
{ NULL, 0, 0, false, false, false, NULL, false }
};
/* Returns TRUE iff the attribute indicated by ATTR_ID takes a plain
identifier as an argument, so the front end shouldn't look it up. */
bool
attribute_takes_identifier_p (const_tree attr_id)
{
const struct attribute_spec *spec = lookup_attribute_spec (attr_id);
if (spec == NULL)
/* Unknown attribute that we'll end up ignoring, return true so we
don't complain about an identifier argument. */
return true;
else if (!strcmp ("mode", spec->name)
|| !strcmp ("format", spec->name)
|| !strcmp ("cleanup", spec->name))
return true;
else
return targetm.attribute_takes_identifier_p (attr_id);
}
/* Attribute handlers common to C front ends. */
/* Handle a "packed" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int flags, bool *no_add_attrs)
{
if (TYPE_P (*node))
{
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
*node = build_variant_type_copy (*node);
TYPE_PACKED (*node) = 1;
}
else if (TREE_CODE (*node) == FIELD_DECL)
{
if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT
/* Still pack bitfields. */
&& ! DECL_INITIAL (*node))
warning (OPT_Wattributes,
"%qE attribute ignored for field of type %qT",
name, TREE_TYPE (*node));
else
DECL_PACKED (*node) = 1;
}
/* We can't set DECL_PACKED for a VAR_DECL, because the bit is
used for DECL_REGISTER. It wouldn't mean anything anyway.
We can't set DECL_PACKED on the type of a TYPE_DECL, because
that changes what the typedef is typing. */
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "nocommon" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_nocommon_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (VAR_P (*node))
DECL_COMMON (*node) = 0;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "common" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (VAR_P (*node))
DECL_COMMON (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "noreturn" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree type = TREE_TYPE (*node);
/* See FIXME comment in c_common_attribute_table. */
if (TREE_CODE (*node) == FUNCTION_DECL
|| objc_method_decl (TREE_CODE (*node)))
TREE_THIS_VOLATILE (*node) = 1;
else if (TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
TREE_TYPE (*node)
= (build_qualified_type
(build_pointer_type
(build_type_variant (TREE_TYPE (type),
TYPE_READONLY (TREE_TYPE (type)), 1)),
TYPE_QUALS (type)));
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "hot" and attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL
|| TREE_CODE (*node) == LABEL_DECL)
{
if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL)
{
warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
"with attribute %qs", name, "cold");
*no_add_attrs = true;
}
/* Most of the rest of the hot processing is done later with
lookup_attribute. */
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "cold" and attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL
|| TREE_CODE (*node) == LABEL_DECL)
{
if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL)
{
warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
"with attribute %qs", name, "hot");
*no_add_attrs = true;
}
/* Most of the rest of the cold processing is done later with
lookup_attribute. */
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "no_sanitize_address" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_sanitize_address_attribute (tree *node, tree name, tree, int,
bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "no_address_safety_analysis" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_address_safety_analysis_attribute (tree *node, tree name, tree, int,
bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else if (!lookup_attribute ("no_sanitize_address", DECL_ATTRIBUTES (*node)))
DECL_ATTRIBUTES (*node)
= tree_cons (get_identifier ("no_sanitize_address"),
NULL_TREE, DECL_ATTRIBUTES (*node));
*no_add_attrs = true;
return NULL_TREE;
}
/* Handle a "no_sanitize_undefined" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_sanitize_undefined_attribute (tree *node, tree name, tree, int,
bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle an "asan odr indicator" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_asan_odr_indicator_attribute (tree *, tree, tree, int, bool *)
{
return NULL_TREE;
}
/* Handle a "stack_protect" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_stack_protect_attribute (tree *node, tree name, tree, int,
bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
else
DECL_ATTRIBUTES (*node)
= tree_cons (get_identifier ("stack_protect"),
NULL_TREE, DECL_ATTRIBUTES (*node));
return NULL_TREE;
}
/* Handle a "noinline" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noinline_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
{
if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node)))
{
warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
"with attribute %qs", name, "always_inline");
*no_add_attrs = true;
}
else
DECL_UNINLINABLE (*node) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "noclone" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noclone_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "no_icf" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noicf_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "always_inline" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_always_inline_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
{
if (lookup_attribute ("noinline", DECL_ATTRIBUTES (*node)))
{
warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
"with %qs attribute", name, "noinline");
*no_add_attrs = true;
}
else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node)))
{
warning (OPT_Wattributes, "%qE attribute ignored due to conflict "
"with %qs attribute", name, "target_clones");
*no_add_attrs = true;
}
else
/* Set the attribute and mark it for disregarding inline
limits. */
DECL_DISREGARD_INLINE_LIMITS (*node) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "gnu_inline" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_gnu_inline_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
{
/* Do nothing else, just set the attribute. We'll get at
it later with lookup_attribute. */
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "leaf" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_leaf_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
if (!TREE_PUBLIC (*node))
{
warning (OPT_Wattributes, "%qE attribute has no effect on unit local "
"functions", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle an "artificial" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_artificial_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node))
{
/* Do nothing else, just set the attribute. We'll get at
it later with lookup_attribute. */
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "flatten" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_flatten_attribute (tree *node, tree name,
tree args ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
/* Do nothing else, just set the attribute. We'll get at
it later with lookup_attribute. */
;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "warning" or "error" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_error_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL
&& TREE_CODE (TREE_VALUE (args)) == STRING_CST)
/* Do nothing else, just set the attribute. We'll get at
it later with lookup_attribute. */
;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "used" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree node = *pnode;
if (TREE_CODE (node) == FUNCTION_DECL
|| (VAR_P (node) && TREE_STATIC (node))
|| (TREE_CODE (node) == TYPE_DECL))
{
TREE_USED (node) = 1;
DECL_PRESERVE_P (node) = 1;
if (VAR_P (node))
DECL_READ_P (node) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "unused" attribute; arguments as in
struct attribute_spec.handler. */
tree
handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int flags, bool *no_add_attrs)
{
if (DECL_P (*node))
{
tree decl = *node;
if (TREE_CODE (decl) == PARM_DECL
|| VAR_OR_FUNCTION_DECL_P (decl)
|| TREE_CODE (decl) == LABEL_DECL
|| TREE_CODE (decl) == CONST_DECL
|| TREE_CODE (decl) == TYPE_DECL)
{
TREE_USED (decl) = 1;
if (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL)
DECL_READ_P (decl) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
}
else
{
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
*node = build_variant_type_copy (*node);
TREE_USED (*node) = 1;
}
return NULL_TREE;
}
/* Handle a "externally_visible" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_externally_visible_attribute (tree *pnode, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree node = *pnode;
if (VAR_OR_FUNCTION_DECL_P (node))
{
if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL
&& !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node))
{
warning (OPT_Wattributes,
"%qE attribute have effect only on public objects", name);
*no_add_attrs = true;
}
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle the "no_reorder" attribute. Arguments as in
struct attribute_spec.handler. */
static tree
handle_no_reorder_attribute (tree *pnode,
tree name,
tree,
int,
bool *no_add_attrs)
{
tree node = *pnode;
if (!VAR_OR_FUNCTION_DECL_P (node)
&& !(TREE_STATIC (node) || DECL_EXTERNAL (node)))
{
warning (OPT_Wattributes,
"%qE attribute only affects top level objects",
name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "const" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree type = TREE_TYPE (*node);
/* See FIXME comment on noreturn in c_common_attribute_table. */
if (TREE_CODE (*node) == FUNCTION_DECL)
TREE_READONLY (*node) = 1;
else if (TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
TREE_TYPE (*node)
= (build_qualified_type
(build_pointer_type
(build_type_variant (TREE_TYPE (type), 1,
TREE_THIS_VOLATILE (TREE_TYPE (type)))),
TYPE_QUALS (type)));
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "scalar_storage_order" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_scalar_storage_order_attribute (tree *node, tree name, tree args,
int flags, bool *no_add_attrs)
{
tree id = TREE_VALUE (args);
tree type;
if (TREE_CODE (*node) == TYPE_DECL
&& ! (flags & ATTR_FLAG_CXX11))
node = &TREE_TYPE (*node);
type = *node;
if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN)
{
error ("scalar_storage_order is not supported because endianness "
"is not uniform");
return NULL_TREE;
}
if (RECORD_OR_UNION_TYPE_P (type) && !c_dialect_cxx ())
{
bool reverse = false;
if (TREE_CODE (id) == STRING_CST
&& strcmp (TREE_STRING_POINTER (id), "big-endian") == 0)
reverse = !BYTES_BIG_ENDIAN;
else if (TREE_CODE (id) == STRING_CST
&& strcmp (TREE_STRING_POINTER (id), "little-endian") == 0)
reverse = BYTES_BIG_ENDIAN;
else
{
error ("scalar_storage_order argument must be one of \"big-endian\""
" or \"little-endian\"");
return NULL_TREE;
}
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
{
if (reverse)
/* A type variant isn't good enough, since we don't want a cast
to such a type to be removed as a no-op. */
*node = type = build_duplicate_type (type);
}
TYPE_REVERSE_STORAGE_ORDER (type) = reverse;
return NULL_TREE;
}
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
return NULL_TREE;
}
/* Handle a "transparent_union" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_transparent_union_attribute (tree *node, tree name,
tree ARG_UNUSED (args), int flags,
bool *no_add_attrs)
{
tree type;
*no_add_attrs = true;
if (TREE_CODE (*node) == TYPE_DECL
&& ! (flags & ATTR_FLAG_CXX11))
node = &TREE_TYPE (*node);
type = *node;
if (TREE_CODE (type) == UNION_TYPE)
{
/* Make sure that the first field will work for a transparent union.
If the type isn't complete yet, leave the check to the code in
finish_struct. */
if (TYPE_SIZE (type))
{
tree first = first_field (type);
if (first == NULL_TREE
|| DECL_ARTIFICIAL (first)
|| TYPE_MODE (type) != DECL_MODE (first))
goto ignored;
}
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
{
/* If the type isn't complete yet, setting the flag
on a variant wouldn't ever be checked. */
if (!TYPE_SIZE (type))
goto ignored;
/* build_duplicate_type doesn't work for C++. */
if (c_dialect_cxx ())
goto ignored;
/* A type variant isn't good enough, since we don't want a cast
to such a type to be removed as a no-op. */
*node = type = build_duplicate_type (type);
}
for (tree t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
TYPE_TRANSPARENT_AGGR (t) = 1;
return NULL_TREE;
}
ignored:
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
/* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to
get the requested priority for a constructor or destructor,
possibly issuing diagnostics for invalid or reserved
priorities. */
static priority_type
get_priority (tree args, bool is_destructor)
{
HOST_WIDE_INT pri;
tree arg;
if (!args)
return DEFAULT_INIT_PRIORITY;
if (!SUPPORTS_INIT_PRIORITY)
{
if (is_destructor)
error ("destructor priorities are not supported");
else
error ("constructor priorities are not supported");
return DEFAULT_INIT_PRIORITY;
}
arg = TREE_VALUE (args);
if (TREE_CODE (arg) == IDENTIFIER_NODE)
goto invalid;
if (arg == error_mark_node)
return DEFAULT_INIT_PRIORITY;
arg = default_conversion (arg);
if (!tree_fits_shwi_p (arg)
|| !INTEGRAL_TYPE_P (TREE_TYPE (arg)))
goto invalid;
pri = tree_to_shwi (arg);
if (pri < 0 || pri > MAX_INIT_PRIORITY)
goto invalid;
if (pri <= MAX_RESERVED_INIT_PRIORITY)
{
if (is_destructor)
warning (0,
"destructor priorities from 0 to %d are reserved "
"for the implementation",
MAX_RESERVED_INIT_PRIORITY);
else
warning (0,
"constructor priorities from 0 to %d are reserved "
"for the implementation",
MAX_RESERVED_INIT_PRIORITY);
}
return pri;
invalid:
if (is_destructor)
error ("destructor priorities must be integers from 0 to %d inclusive",
MAX_INIT_PRIORITY);
else
error ("constructor priorities must be integers from 0 to %d inclusive",
MAX_INIT_PRIORITY);
return DEFAULT_INIT_PRIORITY;
}
/* Handle a "constructor" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_constructor_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree decl = *node;
tree type = TREE_TYPE (decl);
if (TREE_CODE (decl) == FUNCTION_DECL
&& TREE_CODE (type) == FUNCTION_TYPE
&& decl_function_context (decl) == 0)
{
priority_type priority;
DECL_STATIC_CONSTRUCTOR (decl) = 1;
priority = get_priority (args, /*is_destructor=*/false);
SET_DECL_INIT_PRIORITY (decl, priority);
TREE_USED (decl) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "destructor" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_destructor_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree decl = *node;
tree type = TREE_TYPE (decl);
if (TREE_CODE (decl) == FUNCTION_DECL
&& TREE_CODE (type) == FUNCTION_TYPE
&& decl_function_context (decl) == 0)
{
priority_type priority;
DECL_STATIC_DESTRUCTOR (decl) = 1;
priority = get_priority (args, /*is_destructor=*/true);
SET_DECL_FINI_PRIORITY (decl, priority);
TREE_USED (decl) = 1;
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Nonzero if the mode is a valid vector mode for this architecture.
This returns nonzero even if there is no hardware support for the
vector mode, but we can emulate with narrower modes. */
static bool
vector_mode_valid_p (machine_mode mode)
{
enum mode_class mclass = GET_MODE_CLASS (mode);
machine_mode innermode;
/* Doh! What's going on? */
if (mclass != MODE_VECTOR_INT
&& mclass != MODE_VECTOR_FLOAT
&& mclass != MODE_VECTOR_FRACT
&& mclass != MODE_VECTOR_UFRACT
&& mclass != MODE_VECTOR_ACCUM
&& mclass != MODE_VECTOR_UACCUM)
return false;
/* Hardware support. Woo hoo! */
if (targetm.vector_mode_supported_p (mode))
return true;
innermode = GET_MODE_INNER (mode);
/* We should probably return 1 if requesting V4DI and we have no DI,
but we have V2DI, but this is probably very unlikely. */
/* If we have support for the inner mode, we can safely emulate it.
We may not have V2DI, but me can emulate with a pair of DIs. */
return targetm.scalar_mode_supported_p (innermode);
}
/* Handle a "mode" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_mode_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree type = *node;
tree ident = TREE_VALUE (args);
*no_add_attrs = true;
if (TREE_CODE (ident) != IDENTIFIER_NODE)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
{
int j;
const char *p = IDENTIFIER_POINTER (ident);
int len = strlen (p);
machine_mode mode = VOIDmode;
tree typefm;
bool valid_mode;
if (len > 4 && p[0] == '_' && p[1] == '_'
&& p[len - 1] == '_' && p[len - 2] == '_')
{
char *newp = (char *) alloca (len - 1);
strcpy (newp, &p[2]);
newp[len - 4] = '\0';
p = newp;
}
/* Change this type to have a type with the specified mode.
First check for the special modes. */
if (!strcmp (p, "byte"))
mode = byte_mode;
else if (!strcmp (p, "word"))
mode = word_mode;
else if (!strcmp (p, "pointer"))
mode = ptr_mode;
else if (!strcmp (p, "libgcc_cmp_return"))
mode = targetm.libgcc_cmp_return_mode ();
else if (!strcmp (p, "libgcc_shift_count"))
mode = targetm.libgcc_shift_count_mode ();
else if (!strcmp (p, "unwind_word"))
mode = targetm.unwind_word_mode ();
else
for (j = 0; j < NUM_MACHINE_MODES; j++)
if (!strcmp (p, GET_MODE_NAME (j)))
{
mode = (machine_mode) j;
break;
}
if (mode == VOIDmode)
{
error ("unknown machine mode %qE", ident);
return NULL_TREE;
}
valid_mode = false;
switch (GET_MODE_CLASS (mode))
{
case MODE_INT:
case MODE_PARTIAL_INT:
case MODE_FLOAT:
case MODE_DECIMAL_FLOAT:
case MODE_FRACT:
case MODE_UFRACT:
case MODE_ACCUM:
case MODE_UACCUM:
valid_mode = targetm.scalar_mode_supported_p (mode);
break;
case MODE_COMPLEX_INT:
case MODE_COMPLEX_FLOAT:
valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode));
break;
case MODE_VECTOR_INT:
case MODE_VECTOR_FLOAT:
case MODE_VECTOR_FRACT:
case MODE_VECTOR_UFRACT:
case MODE_VECTOR_ACCUM:
case MODE_VECTOR_UACCUM:
warning (OPT_Wattributes, "specifying vector types with "
"__attribute__ ((mode)) is deprecated");
warning (OPT_Wattributes,
"use __attribute__ ((vector_size)) instead");
valid_mode = vector_mode_valid_p (mode);
break;
default:
break;
}
if (!valid_mode)
{
error ("unable to emulate %qs", p);
return NULL_TREE;
}
if (POINTER_TYPE_P (type))
{
addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type));
tree (*fn)(tree, machine_mode, bool);
if (!targetm.addr_space.valid_pointer_mode (mode, as))
{
error ("invalid pointer mode %qs", p);
return NULL_TREE;
}
if (TREE_CODE (type) == POINTER_TYPE)
fn = build_pointer_type_for_mode;
else
fn = build_reference_type_for_mode;
typefm = fn (TREE_TYPE (type), mode, false);
}
else
{
/* For fixed-point modes, we need to test if the signness of type
and the machine mode are consistent. */
if (ALL_FIXED_POINT_MODE_P (mode)
&& TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode))
{
error ("signedness of type and machine mode %qs don%'t match", p);
return NULL_TREE;
}
/* For fixed-point modes, we need to pass saturating info. */
typefm = lang_hooks.types.type_for_mode (mode,
ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type)
: TYPE_UNSIGNED (type));
}
if (typefm == NULL_TREE)
{
error ("no data type for mode %qs", p);
return NULL_TREE;
}
else if (TREE_CODE (type) == ENUMERAL_TYPE)
{
/* For enumeral types, copy the precision from the integer
type returned above. If not an INTEGER_TYPE, we can't use
this mode for this type. */
if (TREE_CODE (typefm) != INTEGER_TYPE)
{
error ("cannot use mode %qs for enumeral types", p);
return NULL_TREE;
}
if (flags & ATTR_FLAG_TYPE_IN_PLACE)
{
TYPE_PRECISION (type) = TYPE_PRECISION (typefm);
typefm = type;
}
else
{
/* We cannot build a type variant, as there's code that assumes
that TYPE_MAIN_VARIANT has the same mode. This includes the
debug generators. Instead, create a subrange type. This
results in all of the enumeral values being emitted only once
in the original, and the subtype gets them by reference. */
if (TYPE_UNSIGNED (type))
typefm = make_unsigned_type (TYPE_PRECISION (typefm));
else
typefm = make_signed_type (TYPE_PRECISION (typefm));
TREE_TYPE (typefm) = type;
}
}
else if (VECTOR_MODE_P (mode)
? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm))
: TREE_CODE (type) != TREE_CODE (typefm))
{
error ("mode %qs applied to inappropriate type", p);
return NULL_TREE;
}
*node = build_qualified_type (typefm, TYPE_QUALS (type));
}
return NULL_TREE;
}
/* Handle a "section" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_section_attribute (tree *node, tree ARG_UNUSED (name), tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree decl = *node;
if (!targetm_common.have_named_sections)
{
error_at (DECL_SOURCE_LOCATION (*node),
"section attributes are not supported for this target");
goto fail;
}
if (!VAR_OR_FUNCTION_DECL_P (decl))
{
error ("section attribute not allowed for %q+D", *node);
goto fail;
}
if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
{
error ("section attribute argument not a string constant");
goto fail;
}
if (VAR_P (decl)
&& current_function_decl != NULL_TREE
&& !TREE_STATIC (decl))
{
error_at (DECL_SOURCE_LOCATION (decl),
"section attribute cannot be specified for local variables");
goto fail;
}
/* The decl may have already been given a section attribute
from a previous declaration. Ensure they match. */
if (DECL_SECTION_NAME (decl) != NULL
&& strcmp (DECL_SECTION_NAME (decl),
TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
{
error ("section of %q+D conflicts with previous declaration", *node);
goto fail;
}
if (VAR_P (decl)
&& !targetm.have_tls && targetm.emutls.tmpl_section
&& DECL_THREAD_LOCAL_P (decl))
{
error ("section of %q+D cannot be overridden", *node);
goto fail;
}
set_decl_section_name (decl, TREE_STRING_POINTER (TREE_VALUE (args)));
return NULL_TREE;
fail:
*no_add_attrs = true;
return NULL_TREE;
}
/* If in c++-11, check if the c++-11 alignment constraint with respect
to fundamental alignment (in [dcl.align]) are satisfied. If not in
c++-11 mode, does nothing.
[dcl.align]2/ says:
[* if the constant expression evaluates to a fundamental alignment,
the alignment requirement of the declared entity shall be the
specified fundamental alignment.
* if the constant expression evaluates to an extended alignment
and the implementation supports that alignment in the context
of the declaration, the alignment of the declared entity shall
be that alignment
* if the constant expression evaluates to an extended alignment
and the implementation does not support that alignment in the
context of the declaration, the program is ill-formed]. */
static bool
check_cxx_fundamental_alignment_constraints (tree node,
unsigned align_log,
int flags)
{
bool alignment_too_large_p = false;
unsigned requested_alignment = (1U << align_log) * BITS_PER_UNIT;
unsigned max_align = 0;
if ((!(flags & ATTR_FLAG_CXX11) && !warn_cxx_compat)
|| (node == NULL_TREE || node == error_mark_node))
return true;
if (cxx_fundamental_alignment_p (requested_alignment))
return true;
if (VAR_P (node))
{
if (TREE_STATIC (node) || DECL_EXTERNAL (node))
/* For file scope variables and static members, the target supports
alignments that are at most MAX_OFILE_ALIGNMENT. */
max_align = MAX_OFILE_ALIGNMENT;
else
/* For stack variables, the target supports at most
MAX_STACK_ALIGNMENT. */
max_align = MAX_STACK_ALIGNMENT;
if (requested_alignment > max_align)
alignment_too_large_p = true;
}
/* Let's be liberal for types and fields; don't limit their alignment any
more than check_user_alignment already did. */
if (alignment_too_large_p)
pedwarn (input_location, OPT_Wattributes,
"requested alignment %d is larger than %d",
requested_alignment / BITS_PER_UNIT, max_align / BITS_PER_UNIT);
return !alignment_too_large_p;
}
/* Handle a "aligned" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args,
int flags, bool *no_add_attrs)
{
tree decl = NULL_TREE;
tree *type = NULL;
int is_type = 0;
tree align_expr;
int i;
if (args)
{
align_expr = TREE_VALUE (args);
if (align_expr && TREE_CODE (align_expr) != IDENTIFIER_NODE
&& TREE_CODE (align_expr) != FUNCTION_DECL)
align_expr = default_conversion (align_expr);
}
else
align_expr = size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT);
if (DECL_P (*node))
{
decl = *node;
type = &TREE_TYPE (decl);
is_type = TREE_CODE (*node) == TYPE_DECL;
}
else if (TYPE_P (*node))
type = node, is_type = 1;
if ((i = check_user_alignment (align_expr, true)) == -1
|| !check_cxx_fundamental_alignment_constraints (*node, i, flags))
*no_add_attrs = true;
else if (is_type)
{
if ((flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
/* OK, modify the type in place. */;
/* If we have a TYPE_DECL, then copy the type, so that we
don't accidentally modify a builtin type. See pushdecl. */
else if (decl && TREE_TYPE (decl) != error_mark_node
&& DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
{
tree tt = TREE_TYPE (decl);
*type = build_variant_type_copy (*type);
DECL_ORIGINAL_TYPE (decl) = tt;
TYPE_NAME (*type) = decl;
TREE_USED (*type) = TREE_USED (decl);
TREE_TYPE (decl) = *type;
}
else
*type = build_variant_type_copy (*type);
SET_TYPE_ALIGN (*type, (1U << i) * BITS_PER_UNIT);
TYPE_USER_ALIGN (*type) = 1;
}
else if (! VAR_OR_FUNCTION_DECL_P (decl)
&& TREE_CODE (decl) != FIELD_DECL)
{
error ("alignment may not be specified for %q+D", decl);
*no_add_attrs = true;
}
else if (DECL_USER_ALIGN (decl)
&& DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT)
/* C++-11 [dcl.align/4]:
When multiple alignment-specifiers are specified for an
entity, the alignment requirement shall be set to the
strictest specified alignment.
This formally comes from the c++11 specification but we are
doing it for the GNU attribute syntax as well. */
*no_add_attrs = true;
else if (TREE_CODE (decl) == FUNCTION_DECL
&& DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT)
{
if (DECL_USER_ALIGN (decl))
error ("alignment for %q+D was previously specified as %d "
"and may not be decreased", decl,
DECL_ALIGN (decl) / BITS_PER_UNIT);
else
error ("alignment for %q+D must be at least %d", decl,
DECL_ALIGN (decl) / BITS_PER_UNIT);
*no_add_attrs = true;
}
else
{
SET_DECL_ALIGN (decl, (1U << i) * BITS_PER_UNIT);
DECL_USER_ALIGN (decl) = 1;
}
return NULL_TREE;
}
/* Handle a "weak" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_weak_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool * ARG_UNUSED (no_add_attrs))
{
if (TREE_CODE (*node) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (*node))
{
warning (OPT_Wattributes, "inline function %q+D declared weak", *node);
*no_add_attrs = true;
}
else if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node)))
{
error ("indirect function %q+D cannot be declared weak", *node);
*no_add_attrs = true;
return NULL_TREE;
}
else if (VAR_OR_FUNCTION_DECL_P (*node))
declare_weak (*node);
else
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
/* Handle a "noplt" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noplt_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool * ARG_UNUSED (no_add_attrs))
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes,
"%qE attribute is only applicable on functions", name);
*no_add_attrs = true;
return NULL_TREE;
}
return NULL_TREE;
}
/* Handle an "alias" or "ifunc" attribute; arguments as in
struct attribute_spec.handler, except that IS_ALIAS tells us
whether this is an alias as opposed to ifunc attribute. */
static tree
handle_alias_ifunc_attribute (bool is_alias, tree *node, tree name, tree args,
bool *no_add_attrs)
{
tree decl = *node;
if (TREE_CODE (decl) != FUNCTION_DECL
&& (!is_alias || !VAR_P (decl)))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
|| (TREE_CODE (decl) != FUNCTION_DECL
&& TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
/* A static variable declaration is always a tentative definition,
but the alias is a non-tentative definition which overrides. */
|| (TREE_CODE (decl) != FUNCTION_DECL
&& ! TREE_PUBLIC (decl) && DECL_INITIAL (decl)))
{
error ("%q+D defined both normally and as %qE attribute", decl, name);
*no_add_attrs = true;
return NULL_TREE;
}
else if (!is_alias
&& (lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
|| lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))))
{
error ("weak %q+D cannot be defined %qE", decl, name);
*no_add_attrs = true;
return NULL_TREE;
}
/* Note that the very first time we process a nested declaration,
decl_function_context will not be set. Indeed, *would* never
be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
we do below. After such frobbery, pushdecl would set the context.
In any case, this is never what we want. */
else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
{
tree id;
id = TREE_VALUE (args);
if (TREE_CODE (id) != STRING_CST)
{
error ("attribute %qE argument not a string", name);
*no_add_attrs = true;
return NULL_TREE;
}
id = get_identifier (TREE_STRING_POINTER (id));
/* This counts as a use of the object pointed to. */
TREE_USED (id) = 1;
if (TREE_CODE (decl) == FUNCTION_DECL)
DECL_INITIAL (decl) = error_mark_node;
else
TREE_STATIC (decl) = 1;
if (!is_alias)
{
/* ifuncs are also aliases, so set that attribute too. */
DECL_ATTRIBUTES (decl)
= tree_cons (get_identifier ("alias"), args,
DECL_ATTRIBUTES (decl));
DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("ifunc"),
NULL, DECL_ATTRIBUTES (decl));
}
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
if (decl_in_symtab_p (*node))
{
struct symtab_node *n = symtab_node::get (decl);
if (n && n->refuse_visibility_changes)
{
if (is_alias)
error ("%+D declared alias after being used", decl);
else
error ("%+D declared ifunc after being used", decl);
}
}
return NULL_TREE;
}
/* Handle an "alias" or "ifunc" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_ifunc_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
return handle_alias_ifunc_attribute (false, node, name, args, no_add_attrs);
}
/* Handle an "alias" or "ifunc" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_alias_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
return handle_alias_ifunc_attribute (true, node, name, args, no_add_attrs);
}
/* Handle a "weakref" attribute; arguments as in struct
attribute_spec.handler. */
static tree
handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args,
int flags, bool *no_add_attrs)
{
tree attr = NULL_TREE;
/* We must ignore the attribute when it is associated with
local-scoped decls, since attribute alias is ignored and many
such symbols do not even have a DECL_WEAK field. */
if (decl_function_context (*node)
|| current_function_decl
|| !VAR_OR_FUNCTION_DECL_P (*node))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
return NULL_TREE;
}
if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node)))
{
error ("indirect function %q+D cannot be declared weakref", *node);
*no_add_attrs = true;
return NULL_TREE;
}
/* The idea here is that `weakref("name")' mutates into `weakref,
alias("name")', and weakref without arguments, in turn,
implicitly adds weak. */
if (args)
{
attr = tree_cons (get_identifier ("alias"), args, attr);
attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr);
*no_add_attrs = true;
decl_attributes (node, attr, flags);
}
else
{
if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node)))
error_at (DECL_SOURCE_LOCATION (*node),
"weakref attribute must appear before alias attribute");
/* Can't call declare_weak because it wants this to be TREE_PUBLIC,
and that isn't supported; and because it wants to add it to
the list of weak decls, which isn't helpful. */
DECL_WEAK (*node) = 1;
}
if (decl_in_symtab_p (*node))
{
struct symtab_node *n = symtab_node::get (*node);
if (n && n->refuse_visibility_changes)
error ("%+D declared weakref after being used", *node);
}
return NULL_TREE;
}
/* Handle an "visibility" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_visibility_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags),
bool *ARG_UNUSED (no_add_attrs))
{
tree decl = *node;
tree id = TREE_VALUE (args);
enum symbol_visibility vis;
if (TYPE_P (*node))
{
if (TREE_CODE (*node) == ENUMERAL_TYPE)
/* OK */;
else if (!RECORD_OR_UNION_TYPE_P (*node))
{
warning (OPT_Wattributes, "%qE attribute ignored on non-class types",
name);
return NULL_TREE;
}
else if (TYPE_FIELDS (*node))
{
error ("%qE attribute ignored because %qT is already defined",
name, *node);
return NULL_TREE;
}
}
else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
if (TREE_CODE (id) != STRING_CST)
{
error ("visibility argument not a string");
return NULL_TREE;
}
/* If this is a type, set the visibility on the type decl. */
if (TYPE_P (decl))
{
decl = TYPE_NAME (decl);
if (!decl)
return NULL_TREE;
if (TREE_CODE (decl) == IDENTIFIER_NODE)
{
warning (OPT_Wattributes, "%qE attribute ignored on types",
name);
return NULL_TREE;
}
}
if (strcmp (TREE_STRING_POINTER (id), "default") == 0)
vis = VISIBILITY_DEFAULT;
else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0)
vis = VISIBILITY_INTERNAL;
else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0)
vis = VISIBILITY_HIDDEN;
else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0)
vis = VISIBILITY_PROTECTED;
else
{
error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
vis = VISIBILITY_DEFAULT;
}
if (DECL_VISIBILITY_SPECIFIED (decl)
&& vis != DECL_VISIBILITY (decl))
{
tree attributes = (TYPE_P (*node)
? TYPE_ATTRIBUTES (*node)
: DECL_ATTRIBUTES (decl));
if (lookup_attribute ("visibility", attributes))
error ("%qD redeclared with different visibility", decl);
else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllimport", attributes))
error ("%qD was declared %qs which implies default visibility",
decl, "dllimport");
else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllexport", attributes))
error ("%qD was declared %qs which implies default visibility",
decl, "dllexport");
}
DECL_VISIBILITY (decl) = vis;
DECL_VISIBILITY_SPECIFIED (decl) = 1;
/* Go ahead and attach the attribute to the node as well. This is needed
so we can determine whether we have VISIBILITY_DEFAULT because the
visibility was not specified, or because it was explicitly overridden
from the containing scope. */
return NULL_TREE;
}
/* Handle an "tls_model" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_tls_model_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree id;
tree decl = *node;
enum tls_model kind;
*no_add_attrs = true;
if (!VAR_P (decl) || !DECL_THREAD_LOCAL_P (decl))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
kind = DECL_TLS_MODEL (decl);
id = TREE_VALUE (args);
if (TREE_CODE (id) != STRING_CST)
{
error ("tls_model argument not a string");
return NULL_TREE;
}
if (!strcmp (TREE_STRING_POINTER (id), "local-exec"))
kind = TLS_MODEL_LOCAL_EXEC;
else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec"))
kind = TLS_MODEL_INITIAL_EXEC;
else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic"))
kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC;
else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic"))
kind = TLS_MODEL_GLOBAL_DYNAMIC;
else
error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
set_decl_tls_model (decl, kind);
return NULL_TREE;
}
/* Handle a "no_instrument_function" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_instrument_function_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree decl = *node;
if (TREE_CODE (decl) != FUNCTION_DECL)
{
error_at (DECL_SOURCE_LOCATION (decl),
"%qE attribute applies only to functions", name);
*no_add_attrs = true;
}
else
DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
return NULL_TREE;
}
/* Handle a "no_profile_instrument_function" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_profile_instrument_function_attribute (tree *node, tree name, tree,
int, bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "malloc" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL
&& POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
DECL_IS_MALLOC (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "alloc_size" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
unsigned arg_count = type_num_arguments (*node);
for (; args; args = TREE_CHAIN (args))
{
tree position = TREE_VALUE (args);
if (position && TREE_CODE (position) != IDENTIFIER_NODE
&& TREE_CODE (position) != FUNCTION_DECL)
position = default_conversion (position);
if (!tree_fits_uhwi_p (position)
|| !arg_count
|| !IN_RANGE (tree_to_uhwi (position), 1, arg_count))
{
warning (OPT_Wattributes,
"alloc_size parameter outside range");
*no_add_attrs = true;
return NULL_TREE;
}
}
return NULL_TREE;
}
/* Handle a "alloc_align" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_alloc_align_attribute (tree *node, tree, tree args, int,
bool *no_add_attrs)
{
unsigned arg_count = type_num_arguments (*node);
tree position = TREE_VALUE (args);
if (position && TREE_CODE (position) != IDENTIFIER_NODE
&& TREE_CODE (position) != FUNCTION_DECL)
position = default_conversion (position);
if (!tree_fits_uhwi_p (position)
|| !arg_count
|| !IN_RANGE (tree_to_uhwi (position), 1, arg_count))
{
warning (OPT_Wattributes,
"alloc_align parameter outside range");
*no_add_attrs = true;
return NULL_TREE;
}
return NULL_TREE;
}
/* Handle a "assume_aligned" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_assume_aligned_attribute (tree *, tree, tree args, int,
bool *no_add_attrs)
{
for (; args; args = TREE_CHAIN (args))
{
tree position = TREE_VALUE (args);
if (position && TREE_CODE (position) != IDENTIFIER_NODE
&& TREE_CODE (position) != FUNCTION_DECL)
position = default_conversion (position);
if (TREE_CODE (position) != INTEGER_CST)
{
warning (OPT_Wattributes,
"assume_aligned parameter not integer constant");
*no_add_attrs = true;
return NULL_TREE;
}
}
return NULL_TREE;
}
/* Handle a "fn spec" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_fnspec_attribute (tree *node ATTRIBUTE_UNUSED, tree ARG_UNUSED (name),
tree args, int ARG_UNUSED (flags),
bool *no_add_attrs ATTRIBUTE_UNUSED)
{
gcc_assert (args
&& TREE_CODE (TREE_VALUE (args)) == STRING_CST
&& !TREE_CHAIN (args));
return NULL_TREE;
}
/* Handle a "bnd_variable_size" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_bnd_variable_size_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FIELD_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "bnd_legacy" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_bnd_legacy (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "bnd_instrument" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_bnd_instrument (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "warn_unused" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_warn_unused_attribute (tree *node, tree name,
tree args ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED, bool *no_add_attrs)
{
if (TYPE_P (*node))
/* Do nothing else, just set the attribute. We'll get at
it later with lookup_attribute. */
;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle an "omp declare simd" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_omp_declare_simd_attribute (tree *, tree, tree, int, bool *)
{
return NULL_TREE;
}
/* Handle a "simd" attribute. */
static tree
handle_simd_attribute (tree *node, tree name, tree args, int, bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
{
if (lookup_attribute ("cilk simd function",
DECL_ATTRIBUTES (*node)) != NULL)
{
error_at (DECL_SOURCE_LOCATION (*node),
"%<__simd__%> attribute cannot be used in the same "
"function marked as a Cilk Plus SIMD-enabled function");
*no_add_attrs = true;
}
else
{
tree t = get_identifier ("omp declare simd");
tree attr = NULL_TREE;
if (args)
{
tree id = TREE_VALUE (args);
if (TREE_CODE (id) != STRING_CST)
{
error ("attribute %qE argument not a string", name);
*no_add_attrs = true;
return NULL_TREE;
}
if (strcmp (TREE_STRING_POINTER (id), "notinbranch") == 0)
attr = build_omp_clause (DECL_SOURCE_LOCATION (*node),
OMP_CLAUSE_NOTINBRANCH);
else
if (strcmp (TREE_STRING_POINTER (id), "inbranch") == 0)
attr = build_omp_clause (DECL_SOURCE_LOCATION (*node),
OMP_CLAUSE_INBRANCH);
else
{
error ("only %<inbranch%> and %<notinbranch%> flags are "
"allowed for %<__simd__%> attribute");
*no_add_attrs = true;
return NULL_TREE;
}
}
DECL_ATTRIBUTES (*node) = tree_cons (t,
build_tree_list (NULL_TREE,
attr),
DECL_ATTRIBUTES (*node));
}
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle an "omp declare target" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_omp_declare_target_attribute (tree *, tree, tree, int, bool *)
{
return NULL_TREE;
}
/* Handle a "returns_twice" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_returns_twice_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
DECL_IS_RETURNS_TWICE (*node) = 1;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "no_limit_stack" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_limit_stack_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree decl = *node;
if (TREE_CODE (decl) != FUNCTION_DECL)
{
error_at (DECL_SOURCE_LOCATION (decl),
"%qE attribute applies only to functions", name);
*no_add_attrs = true;
}
else if (DECL_INITIAL (decl))
{
error_at (DECL_SOURCE_LOCATION (decl),
"can%'t set %qE attribute after definition", name);
*no_add_attrs = true;
}
else
DECL_NO_LIMIT_STACK (decl) = 1;
return NULL_TREE;
}
/* Handle a "pure" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
DECL_PURE_P (*node) = 1;
/* ??? TODO: Support types. */
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Digest an attribute list destined for a transactional memory statement.
ALLOWED is the set of attributes that are allowed for this statement;
return the attribute we parsed. Multiple attributes are never allowed. */
int
parse_tm_stmt_attr (tree attrs, int allowed)
{
tree a_seen = NULL;
int m_seen = 0;
for ( ; attrs ; attrs = TREE_CHAIN (attrs))
{
tree a = TREE_PURPOSE (attrs);
int m = 0;
if (is_attribute_p ("outer", a))
m = TM_STMT_ATTR_OUTER;
if ((m & allowed) == 0)
{
warning (OPT_Wattributes, "%qE attribute directive ignored", a);
continue;
}
if (m_seen == 0)
{
a_seen = a;
m_seen = m;
}
else if (m_seen == m)
warning (OPT_Wattributes, "%qE attribute duplicated", a);
else
warning (OPT_Wattributes, "%qE attribute follows %qE", a, a_seen);
}
return m_seen;
}
/* Transform a TM attribute name into a maskable integer and back.
Note that NULL (i.e. no attribute) is mapped to UNKNOWN, corresponding
to how the lack of an attribute is treated. */
int
tm_attr_to_mask (tree attr)
{
if (attr == NULL)
return 0;
if (is_attribute_p ("transaction_safe", attr))
return TM_ATTR_SAFE;
if (is_attribute_p ("transaction_callable", attr))
return TM_ATTR_CALLABLE;
if (is_attribute_p ("transaction_pure", attr))
return TM_ATTR_PURE;
if (is_attribute_p ("transaction_unsafe", attr))
return TM_ATTR_IRREVOCABLE;
if (is_attribute_p ("transaction_may_cancel_outer", attr))
return TM_ATTR_MAY_CANCEL_OUTER;
return 0;
}
tree
tm_mask_to_attr (int mask)
{
const char *str;
switch (mask)
{
case TM_ATTR_SAFE:
str = "transaction_safe";
break;
case TM_ATTR_CALLABLE:
str = "transaction_callable";
break;
case TM_ATTR_PURE:
str = "transaction_pure";
break;
case TM_ATTR_IRREVOCABLE:
str = "transaction_unsafe";
break;
case TM_ATTR_MAY_CANCEL_OUTER:
str = "transaction_may_cancel_outer";
break;
default:
gcc_unreachable ();
}
return get_identifier (str);
}
/* Return the first TM attribute seen in LIST. */
tree
find_tm_attribute (tree list)
{
for (; list ; list = TREE_CHAIN (list))
{
tree name = TREE_PURPOSE (list);
if (tm_attr_to_mask (name) != 0)
return name;
}
return NULL_TREE;
}
/* Handle the TM attributes; arguments as in struct attribute_spec.handler.
Here we accept only function types, and verify that none of the other
function TM attributes are also applied. */
/* ??? We need to accept class types for C++, but not C. This greatly
complicates this function, since we can no longer rely on the extra
processing given by function_type_required. */
static tree
handle_tm_attribute (tree *node, tree name, tree args,
int flags, bool *no_add_attrs)
{
/* Only one path adds the attribute; others don't. */
*no_add_attrs = true;
switch (TREE_CODE (*node))
{
case RECORD_TYPE:
case UNION_TYPE:
/* Only tm_callable and tm_safe apply to classes. */
if (tm_attr_to_mask (name) & ~(TM_ATTR_SAFE | TM_ATTR_CALLABLE))
goto ignored;
/* FALLTHRU */
case FUNCTION_TYPE:
case METHOD_TYPE:
{
tree old_name = find_tm_attribute (TYPE_ATTRIBUTES (*node));
if (old_name == name)
;
else if (old_name != NULL_TREE)
error ("type was previously declared %qE", old_name);
else
*no_add_attrs = false;
}
break;
case FUNCTION_DECL:
{
/* transaction_safe_dynamic goes on the FUNCTION_DECL, but we also
want to set transaction_safe on the type. */
gcc_assert (is_attribute_p ("transaction_safe_dynamic", name));
if (!TYPE_P (DECL_CONTEXT (*node)))
error_at (DECL_SOURCE_LOCATION (*node),
"%<transaction_safe_dynamic%> may only be specified for "
"a virtual function");
*no_add_attrs = false;
decl_attributes (&TREE_TYPE (*node),
build_tree_list (get_identifier ("transaction_safe"),
NULL_TREE),
0);
break;
}
case POINTER_TYPE:
{
enum tree_code subcode = TREE_CODE (TREE_TYPE (*node));
if (subcode == FUNCTION_TYPE || subcode == METHOD_TYPE)
{
tree fn_tmp = TREE_TYPE (*node);
decl_attributes (&fn_tmp, tree_cons (name, args, NULL), 0);
*node = build_pointer_type (fn_tmp);
break;
}
}
/* FALLTHRU */
default:
/* If a function is next, pass it on to be tried next. */
if (flags & (int) ATTR_FLAG_FUNCTION_NEXT)
return tree_cons (name, args, NULL);
ignored:
warning (OPT_Wattributes, "%qE attribute ignored", name);
break;
}
return NULL_TREE;
}
/* Handle the TM_WRAP attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_tm_wrap_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree decl = *node;
/* We don't need the attribute even on success, since we
record the entry in an external table. */
*no_add_attrs = true;
if (TREE_CODE (decl) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
{
tree wrap_decl = TREE_VALUE (args);
if (error_operand_p (wrap_decl))
;
else if (TREE_CODE (wrap_decl) != IDENTIFIER_NODE
&& !VAR_OR_FUNCTION_DECL_P (wrap_decl))
error ("%qE argument not an identifier", name);
else
{
if (TREE_CODE (wrap_decl) == IDENTIFIER_NODE)
wrap_decl = lookup_name (wrap_decl);
if (wrap_decl && TREE_CODE (wrap_decl) == FUNCTION_DECL)
{
if (lang_hooks.types_compatible_p (TREE_TYPE (decl),
TREE_TYPE (wrap_decl)))
record_tm_replacement (wrap_decl, decl);
else
error ("%qD is not compatible with %qD", wrap_decl, decl);
}
else
error ("%qE argument is not a function", name);
}
}
return NULL_TREE;
}
/* Ignore the given attribute. Used when this attribute may be usefully
overridden by the target, but is not used generically. */
static tree
ignore_attribute (tree * ARG_UNUSED (node), tree ARG_UNUSED (name),
tree ARG_UNUSED (args), int ARG_UNUSED (flags),
bool *no_add_attrs)
{
*no_add_attrs = true;
return NULL_TREE;
}
/* Handle a "no vops" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_novops_attribute (tree *node, tree ARG_UNUSED (name),
tree ARG_UNUSED (args), int ARG_UNUSED (flags),
bool *ARG_UNUSED (no_add_attrs))
{
gcc_assert (TREE_CODE (*node) == FUNCTION_DECL);
DECL_IS_NOVOPS (*node) = 1;
return NULL_TREE;
}
/* Handle a "deprecated" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_deprecated_attribute (tree *node, tree name,
tree args, int flags,
bool *no_add_attrs)
{
tree type = NULL_TREE;
int warn = 0;
tree what = NULL_TREE;
if (!args)
*no_add_attrs = true;
else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
{
error ("deprecated message is not a string");
*no_add_attrs = true;
}
if (DECL_P (*node))
{
tree decl = *node;
type = TREE_TYPE (decl);
if (TREE_CODE (decl) == TYPE_DECL
|| TREE_CODE (decl) == PARM_DECL
|| VAR_OR_FUNCTION_DECL_P (decl)
|| TREE_CODE (decl) == FIELD_DECL
|| TREE_CODE (decl) == CONST_DECL
|| objc_method_decl (TREE_CODE (decl)))
TREE_DEPRECATED (decl) = 1;
else
warn = 1;
}
else if (TYPE_P (*node))
{
if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
*node = build_variant_type_copy (*node);
TREE_DEPRECATED (*node) = 1;
type = *node;
}
else
warn = 1;
if (warn)
{
*no_add_attrs = true;
if (type && TYPE_NAME (type))
{
if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
what = TYPE_NAME (*node);
else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_NAME (TYPE_NAME (type)))
what = DECL_NAME (TYPE_NAME (type));
}
if (what)
warning (OPT_Wattributes, "%qE attribute ignored for %qE", name, what);
else
warning (OPT_Wattributes, "%qE attribute ignored", name);
}
return NULL_TREE;
}
/* Handle a "vector_size" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_vector_size_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags),
bool *no_add_attrs)
{
unsigned HOST_WIDE_INT vecsize, nunits;
machine_mode orig_mode;
tree type = *node, new_type, size;
*no_add_attrs = true;
size = TREE_VALUE (args);
if (size && TREE_CODE (size) != IDENTIFIER_NODE
&& TREE_CODE (size) != FUNCTION_DECL)
size = default_conversion (size);
if (!tree_fits_uhwi_p (size))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
/* Get the vector size (in bytes). */
vecsize = tree_to_uhwi (size);
/* We need to provide for vector pointers, vector arrays, and
functions returning vectors. For example:
__attribute__((vector_size(16))) short *foo;
In this case, the mode is SI, but the type being modified is
HI, so we need to look further. */
while (POINTER_TYPE_P (type)
|| TREE_CODE (type) == FUNCTION_TYPE
|| TREE_CODE (type) == METHOD_TYPE
|| TREE_CODE (type) == ARRAY_TYPE
|| TREE_CODE (type) == OFFSET_TYPE)
type = TREE_TYPE (type);
/* Get the mode of the type being modified. */
orig_mode = TYPE_MODE (type);
if ((!INTEGRAL_TYPE_P (type)
&& !SCALAR_FLOAT_TYPE_P (type)
&& !FIXED_POINT_TYPE_P (type))
|| (!SCALAR_FLOAT_MODE_P (orig_mode)
&& GET_MODE_CLASS (orig_mode) != MODE_INT
&& !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode))
|| !tree_fits_uhwi_p (TYPE_SIZE_UNIT (type))
|| TREE_CODE (type) == BOOLEAN_TYPE)
{
error ("invalid vector type for attribute %qE", name);
return NULL_TREE;
}
if (vecsize % tree_to_uhwi (TYPE_SIZE_UNIT (type)))
{
error ("vector size not an integral multiple of component size");
return NULL;
}
if (vecsize == 0)
{
error ("zero vector size");
return NULL;
}
/* Calculate how many units fit in the vector. */
nunits = vecsize / tree_to_uhwi (TYPE_SIZE_UNIT (type));
if (nunits & (nunits - 1))
{
error ("number of components of the vector not a power of two");
return NULL_TREE;
}
new_type = build_vector_type (type, nunits);
/* Build back pointers if needed. */
*node = lang_hooks.types.reconstruct_complex_type (*node, new_type);
return NULL_TREE;
}
/* Handle the "nonnull" attribute. */
static tree
handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
tree args, int ARG_UNUSED (flags),
bool *no_add_attrs)
{
tree type = *node;
unsigned HOST_WIDE_INT attr_arg_num;
/* If no arguments are specified, all pointer arguments should be
non-null. Verify a full prototype is given so that the arguments
will have the correct types when we actually check them later.
Avoid diagnosing type-generic built-ins since those have no
prototype. */
if (!args)
{
if (!prototype_p (type)
&& (!TYPE_ATTRIBUTES (type)
|| !lookup_attribute ("type generic", TYPE_ATTRIBUTES (type))))
{
error ("nonnull attribute without arguments on a non-prototype");
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Argument list specified. Verify that each argument number references
a pointer argument. */
for (attr_arg_num = 1; args; attr_arg_num++, args = TREE_CHAIN (args))
{
unsigned HOST_WIDE_INT arg_num = 0, ck_num;
tree arg = TREE_VALUE (args);
if (arg && TREE_CODE (arg) != IDENTIFIER_NODE
&& TREE_CODE (arg) != FUNCTION_DECL)
TREE_VALUE (args) = arg = default_conversion (arg);
if (!get_nonnull_operand (arg, &arg_num))
{
error ("nonnull argument has invalid operand number (argument %lu)",
(unsigned long) attr_arg_num);
*no_add_attrs = true;
return NULL_TREE;
}
if (prototype_p (type))
{
function_args_iterator iter;
tree argument;
function_args_iter_init (&iter, type);
for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter))
{
argument = function_args_iter_cond (&iter);
if (argument == NULL_TREE || ck_num == arg_num)
break;
}
if (!argument
|| TREE_CODE (argument) == VOID_TYPE)
{
error ("nonnull argument with out-of-range operand number "
"(argument %lu, operand %lu)",
(unsigned long) attr_arg_num, (unsigned long) arg_num);
*no_add_attrs = true;
return NULL_TREE;
}
if (TREE_CODE (argument) != POINTER_TYPE)
{
error ("nonnull argument references non-pointer operand "
"(argument %lu, operand %lu)",
(unsigned long) attr_arg_num, (unsigned long) arg_num);
*no_add_attrs = true;
return NULL_TREE;
}
}
}
return NULL_TREE;
}
/* Handle a "nothrow" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) == FUNCTION_DECL)
TREE_NOTHROW (*node) = 1;
/* ??? TODO: Support types. */
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "cleanup" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_cleanup_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree decl = *node;
tree cleanup_id, cleanup_decl;
/* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
for global destructors in C++. This requires infrastructure that
we don't have generically at the moment. It's also not a feature
we'd be missing too much, since we do have attribute constructor. */
if (!VAR_P (decl) || TREE_STATIC (decl))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
return NULL_TREE;
}
/* Verify that the argument is a function in scope. */
/* ??? We could support pointers to functions here as well, if
that was considered desirable. */
cleanup_id = TREE_VALUE (args);
if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE)
{
error ("cleanup argument not an identifier");
*no_add_attrs = true;
return NULL_TREE;
}
cleanup_decl = lookup_name (cleanup_id);
if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL)
{
error ("cleanup argument not a function");
*no_add_attrs = true;
return NULL_TREE;
}
/* That the function has proper type is checked with the
eventual call to build_function_call. */
return NULL_TREE;
}
/* Handle a "warn_unused_result" attribute. No special handling. */
static tree
handle_warn_unused_result_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
/* Ignore the attribute for functions not returning any value. */
if (VOID_TYPE_P (TREE_TYPE (*node)))
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle a "sentinel" attribute. */
static tree
handle_sentinel_attribute (tree *node, tree name, tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (!prototype_p (*node))
{
warning (OPT_Wattributes,
"%qE attribute requires prototypes with named arguments", name);
*no_add_attrs = true;
}
else
{
if (!stdarg_p (*node))
{
warning (OPT_Wattributes,
"%qE attribute only applies to variadic functions", name);
*no_add_attrs = true;
}
}
if (args)
{
tree position = TREE_VALUE (args);
if (position && TREE_CODE (position) != IDENTIFIER_NODE
&& TREE_CODE (position) != FUNCTION_DECL)
position = default_conversion (position);
if (TREE_CODE (position) != INTEGER_CST
|| !INTEGRAL_TYPE_P (TREE_TYPE (position)))
{
warning (OPT_Wattributes,
"requested position is not an integer constant");
*no_add_attrs = true;
}
else
{
if (tree_int_cst_lt (position, integer_zero_node))
{
warning (OPT_Wattributes,
"requested position is less than zero");
*no_add_attrs = true;
}
}
}
return NULL_TREE;
}
/* Handle a "type_generic" attribute. */
static tree
handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name),
tree ARG_UNUSED (args), int ARG_UNUSED (flags),
bool * ARG_UNUSED (no_add_attrs))
{
/* Ensure we have a function type. */
gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE);
/* Ensure we have a variadic function. */
gcc_assert (!prototype_p (*node) || stdarg_p (*node));
return NULL_TREE;
}
/* Handle a "target" attribute. */
static tree
handle_target_attribute (tree *node, tree name, tree args, int flags,
bool *no_add_attrs)
{
/* Ensure we have a function type. */
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node