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gnu / gcc / refs/tags/basepoints/gcc-13 / . / gcc / c-family / c-attribs.cc
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/* C-family attributes handling.
Copyright (C) 1992-2022 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/>. */
#define INCLUDE_STRING
#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"
#include "tree-pretty-print.h"
#include "gcc-rich-location.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_hot_attribute (tree *, tree, tree, int, bool *);
static tree handle_cold_attribute (tree *, tree, tree, int, bool *);
static tree handle_no_sanitize_attribute (tree *, tree, tree, int, bool *);
static tree handle_no_sanitize_address_attribute (tree *, tree, tree,
int, bool *);
static tree handle_no_sanitize_thread_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_no_sanitize_coverage_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_no_stack_protector_function_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_nocf_check_attribute (tree *, tree, tree, int, bool *);
static tree handle_symver_attribute (tree *, tree, tree, int, bool *);
static tree handle_noicf_attribute (tree *, tree, tree, int, bool *);
static tree handle_noipa_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_uninitialized_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_special_var_sec_attribute (tree *, tree, tree, int, bool *);
static tree handle_aligned_attribute (tree *, tree, tree, int, bool *);
static tree handle_warn_if_not_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_dealloc_attribute (tree *, tree, tree, int, bool *);
static tree handle_tainted_args_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_unavailable_attribute (tree *, tree, tree, int,
bool *);
static tree handle_vector_size_attribute (tree *, tree, tree, int,
bool *) ATTRIBUTE_NONNULL(3);
static tree handle_vector_mask_attribute (tree *, tree, tree, int,
bool *) ATTRIBUTE_NONNULL(3);
static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
static tree handle_nonstring_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_access_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_zero_call_used_regs_attribute (tree *, tree, tree, int,
bool *);
static tree handle_argspec_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_omp_declare_variant_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_non_overlapping_attribute (tree *, tree, tree, int, bool *);
static tree handle_designated_init_attribute (tree *, tree, tree, int, bool *);
static tree handle_patchable_function_entry_attribute (tree *, tree, tree,
int, bool *);
static tree handle_copy_attribute (tree *, tree, tree, int, bool *);
static tree handle_nsobject_attribute (tree *, tree, tree, int, bool *);
static tree handle_objc_root_class_attribute (tree *, tree, tree, int, bool *);
static tree handle_objc_nullability_attribute (tree *, tree, tree, int, bool *);
static tree handle_signed_bool_precision_attribute (tree *, tree, tree, int,
bool *);
static tree handle_retain_attribute (tree *, tree, tree, int, bool *);
/* Helper to define attribute exclusions. */
#define ATTR_EXCL(name, function, type, variable) \
{ name, function, type, variable }
/* Define attributes that are mutually exclusive with one another. */
static const struct attribute_spec::exclusions attr_aligned_exclusions[] =
{
/* Attribute name exclusion applies to:
function, type, variable */
ATTR_EXCL ("aligned", true, false, false),
ATTR_EXCL ("packed", true, false, false),
ATTR_EXCL (NULL, false, false, false)
};
extern const struct attribute_spec::exclusions attr_cold_hot_exclusions[] =
{
ATTR_EXCL ("cold", true, true, true),
ATTR_EXCL ("hot", true, true, true),
ATTR_EXCL (NULL, false, false, false)
};
static const struct attribute_spec::exclusions attr_common_exclusions[] =
{
ATTR_EXCL ("common", true, true, true),
ATTR_EXCL ("nocommon", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_inline_exclusions[] =
{
ATTR_EXCL ("noinline", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_noinline_exclusions[] =
{
ATTR_EXCL ("always_inline", true, true, true),
ATTR_EXCL ("gnu_inline", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
extern const struct attribute_spec::exclusions attr_noreturn_exclusions[] =
{
ATTR_EXCL ("alloc_align", true, true, true),
ATTR_EXCL ("alloc_size", true, true, true),
ATTR_EXCL ("const", true, true, true),
ATTR_EXCL ("malloc", true, true, true),
ATTR_EXCL ("pure", true, true, true),
ATTR_EXCL ("returns_twice", true, true, true),
ATTR_EXCL ("warn_unused_result", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions
attr_warn_unused_result_exclusions[] =
{
ATTR_EXCL ("noreturn", true, true, true),
ATTR_EXCL ("warn_unused_result", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_returns_twice_exclusions[] =
{
ATTR_EXCL ("noreturn", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
/* Exclusions that apply to attribute alloc_align, alloc_size, and malloc. */
static const struct attribute_spec::exclusions attr_alloc_exclusions[] =
{
ATTR_EXCL ("const", true, true, true),
ATTR_EXCL ("noreturn", true, true, true),
ATTR_EXCL ("pure", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_const_pure_exclusions[] =
{
ATTR_EXCL ("const", true, true, true),
ATTR_EXCL ("alloc_align", true, true, true),
ATTR_EXCL ("alloc_size", true, true, true),
ATTR_EXCL ("malloc", true, true, true),
ATTR_EXCL ("noreturn", true, true, true),
ATTR_EXCL ("pure", true, true, true),
ATTR_EXCL (NULL, false, false, false)
};
/* Exclusions that apply to attributes that put declarations in specific
sections. */
static const struct attribute_spec::exclusions attr_section_exclusions[] =
{
ATTR_EXCL ("noinit", true, true, true),
ATTR_EXCL ("persistent", true, true, true),
ATTR_EXCL ("section", true, true, true),
ATTR_EXCL (NULL, false, false, false),
};
static const struct attribute_spec::exclusions attr_stack_protect_exclusions[] =
{
ATTR_EXCL ("stack_protect", true, false, false),
ATTR_EXCL ("no_stack_protector", true, false, false),
ATTR_EXCL (NULL, false, false, false),
};
/* Table of machine-independent attributes common to all C-like languages.
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,
affects_type_identity, handler, exclude } */
{ "signed_bool_precision", 1, 1, false, true, false, true,
handle_signed_bool_precision_attribute, NULL },
{ "packed", 0, 0, false, false, false, false,
handle_packed_attribute,
attr_aligned_exclusions },
{ "nocommon", 0, 0, true, false, false, false,
handle_nocommon_attribute,
attr_common_exclusions },
{ "common", 0, 0, true, false, false, false,
handle_common_attribute,
attr_common_exclusions },
/* 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, false,
handle_noreturn_attribute,
attr_noreturn_exclusions },
{ "volatile", 0, 0, true, false, false, false,
handle_noreturn_attribute, NULL },
{ "stack_protect", 0, 0, true, false, false, false,
handle_stack_protect_attribute,
attr_stack_protect_exclusions },
{ "no_stack_protector", 0, 0, true, false, false, false,
handle_no_stack_protector_function_attribute,
attr_stack_protect_exclusions },
{ "noinline", 0, 0, true, false, false, false,
handle_noinline_attribute,
attr_noinline_exclusions },
{ "noclone", 0, 0, true, false, false, false,
handle_noclone_attribute, NULL },
{ "no_icf", 0, 0, true, false, false, false,
handle_noicf_attribute, NULL },
{ "noipa", 0, 0, true, false, false, false,
handle_noipa_attribute, NULL },
{ "leaf", 0, 0, true, false, false, false,
handle_leaf_attribute, NULL },
{ "always_inline", 0, 0, true, false, false, false,
handle_always_inline_attribute,
attr_inline_exclusions },
{ "gnu_inline", 0, 0, true, false, false, false,
handle_gnu_inline_attribute,
attr_inline_exclusions },
{ "artificial", 0, 0, true, false, false, false,
handle_artificial_attribute, NULL },
{ "flatten", 0, 0, true, false, false, false,
handle_flatten_attribute, NULL },
{ "used", 0, 0, true, false, false, false,
handle_used_attribute, NULL },
{ "unused", 0, 0, false, false, false, false,
handle_unused_attribute, NULL },
{ "uninitialized", 0, 0, true, false, false, false,
handle_uninitialized_attribute, NULL },
{ "retain", 0, 0, true, false, false, false,
handle_retain_attribute, NULL },
{ "externally_visible", 0, 0, true, false, false, false,
handle_externally_visible_attribute, NULL },
{ "no_reorder", 0, 0, true, false, false, false,
handle_no_reorder_attribute, NULL },
/* The same comments as for noreturn attributes apply to const ones. */
{ "const", 0, 0, true, false, false, false,
handle_const_attribute,
attr_const_pure_exclusions },
{ "scalar_storage_order", 1, 1, false, false, false, false,
handle_scalar_storage_order_attribute, NULL },
{ "transparent_union", 0, 0, false, false, false, false,
handle_transparent_union_attribute, NULL },
{ "constructor", 0, 1, true, false, false, false,
handle_constructor_attribute, NULL },
{ "destructor", 0, 1, true, false, false, false,
handle_destructor_attribute, NULL },
{ "mode", 1, 1, false, true, false, false,
handle_mode_attribute, NULL },
{ "section", 1, 1, true, false, false, false,
handle_section_attribute, attr_section_exclusions },
{ "aligned", 0, 1, false, false, false, false,
handle_aligned_attribute,
attr_aligned_exclusions },
{ "warn_if_not_aligned", 0, 1, false, false, false, false,
handle_warn_if_not_aligned_attribute, NULL },
{ "weak", 0, 0, true, false, false, false,
handle_weak_attribute, NULL },
{ "noplt", 0, 0, true, false, false, false,
handle_noplt_attribute, NULL },
{ "ifunc", 1, 1, true, false, false, false,
handle_ifunc_attribute, NULL },
{ "alias", 1, 1, true, false, false, false,
handle_alias_attribute, NULL },
{ "weakref", 0, 1, true, false, false, false,
handle_weakref_attribute, NULL },
{ "no_instrument_function", 0, 0, true, false, false, false,
handle_no_instrument_function_attribute,
NULL },
{ "no_profile_instrument_function", 0, 0, true, false, false, false,
handle_no_profile_instrument_function_attribute,
NULL },
{ "malloc", 0, 2, true, false, false, false,
handle_malloc_attribute, attr_alloc_exclusions },
{ "returns_twice", 0, 0, true, false, false, false,
handle_returns_twice_attribute,
attr_returns_twice_exclusions },
{ "no_stack_limit", 0, 0, true, false, false, false,
handle_no_limit_stack_attribute, NULL },
{ "pure", 0, 0, true, false, false, false,
handle_pure_attribute,
attr_const_pure_exclusions },
{ "transaction_callable", 0, 0, false, true, false, false,
handle_tm_attribute, NULL },
{ "transaction_unsafe", 0, 0, false, true, false, true,
handle_tm_attribute, NULL },
{ "transaction_safe", 0, 0, false, true, false, true,
handle_tm_attribute, NULL },
{ "transaction_safe_dynamic", 0, 0, true, false, false, false,
handle_tm_attribute, NULL },
{ "transaction_may_cancel_outer", 0, 0, false, true, false, false,
handle_tm_attribute, NULL },
/* ??? 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, false,
handle_tm_attribute, NULL },
{ "transaction_wrap", 1, 1, true, false, false, false,
handle_tm_wrap_attribute, NULL },
/* 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, false,
handle_novops_attribute, NULL },
{ "deprecated", 0, 1, false, false, false, false,
handle_deprecated_attribute, NULL },
{ "unavailable", 0, 1, false, false, false, false,
handle_unavailable_attribute, NULL },
{ "vector_size", 1, 1, false, true, false, true,
handle_vector_size_attribute, NULL },
{ "vector_mask", 0, 0, false, true, false, true,
handle_vector_mask_attribute, NULL },
{ "visibility", 1, 1, false, false, false, false,
handle_visibility_attribute, NULL },
{ "tls_model", 1, 1, true, false, false, false,
handle_tls_model_attribute, NULL },
{ "nonnull", 0, -1, false, true, true, false,
handle_nonnull_attribute, NULL },
{ "nonstring", 0, 0, true, false, false, false,
handle_nonstring_attribute, NULL },
{ "nothrow", 0, 0, true, false, false, false,
handle_nothrow_attribute, NULL },
{ "may_alias", 0, 0, false, true, false, false, NULL, NULL },
{ "cleanup", 1, 1, true, false, false, false,
handle_cleanup_attribute, NULL },
{ "warn_unused_result", 0, 0, false, true, true, false,
handle_warn_unused_result_attribute,
attr_warn_unused_result_exclusions },
{ "sentinel", 0, 1, false, true, true, false,
handle_sentinel_attribute, NULL },
/* 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, false,
handle_type_generic_attribute, NULL },
{ "alloc_size", 1, 2, false, true, true, false,
handle_alloc_size_attribute,
attr_alloc_exclusions },
{ "cold", 0, 0, true, false, false, false,
handle_cold_attribute,
attr_cold_hot_exclusions },
{ "hot", 0, 0, true, false, false, false,
handle_hot_attribute,
attr_cold_hot_exclusions },
{ "no_address_safety_analysis",
0, 0, true, false, false, false,
handle_no_address_safety_analysis_attribute,
NULL },
{ "no_sanitize", 1, -1, true, false, false, false,
handle_no_sanitize_attribute, NULL },
{ "no_sanitize_address", 0, 0, true, false, false, false,
handle_no_sanitize_address_attribute, NULL },
{ "no_sanitize_thread", 0, 0, true, false, false, false,
handle_no_sanitize_thread_attribute, NULL },
{ "no_sanitize_undefined", 0, 0, true, false, false, false,
handle_no_sanitize_undefined_attribute, NULL },
{ "no_sanitize_coverage", 0, 0, true, false, false, false,
handle_no_sanitize_coverage_attribute, NULL },
{ "asan odr indicator", 0, 0, true, false, false, false,
handle_asan_odr_indicator_attribute, NULL },
{ "warning", 1, 1, true, false, false, false,
handle_error_attribute, NULL },
{ "error", 1, 1, true, false, false, false,
handle_error_attribute, NULL },
{ "target", 1, -1, true, false, false, false,
handle_target_attribute, NULL },
{ "target_clones", 1, -1, true, false, false, false,
handle_target_clones_attribute, NULL },
{ "optimize", 1, -1, true, false, false, false,
handle_optimize_attribute, NULL },
/* 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, false,
ignore_attribute, NULL },
{ "no_split_stack", 0, 0, true, false, false, false,
handle_no_split_stack_attribute, NULL },
{ "zero_call_used_regs", 1, 1, true, false, false, false,
handle_zero_call_used_regs_attribute, NULL },
/* For internal use only (marking of function arguments).
The name contains a space to prevent its usage in source code. */
{ "arg spec", 1, -1, true, false, false, false,
handle_argspec_attribute, NULL },
/* 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, false,
handle_fnspec_attribute, NULL },
{ "warn_unused", 0, 0, false, false, false, false,
handle_warn_unused_attribute, NULL },
{ "returns_nonnull", 0, 0, false, true, true, false,
handle_returns_nonnull_attribute, NULL },
{ "omp declare simd", 0, -1, true, false, false, false,
handle_omp_declare_simd_attribute, NULL },
{ "omp declare variant base", 0, -1, true, false, false, false,
handle_omp_declare_variant_attribute, NULL },
{ "omp declare variant variant", 0, -1, true, false, false, false,
handle_omp_declare_variant_attribute, NULL },
{ "simd", 0, 1, true, false, false, false,
handle_simd_attribute, NULL },
{ "omp declare target", 0, -1, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "omp declare target link", 0, 0, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "omp declare target implicit", 0, 0, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "omp declare target host", 0, 0, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "omp declare target nohost", 0, 0, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "omp declare target block", 0, 0, true, false, false, false,
handle_omp_declare_target_attribute, NULL },
{ "non overlapping", 0, 0, true, false, false, false,
handle_non_overlapping_attribute, NULL },
{ "alloc_align", 1, 1, false, true, true, false,
handle_alloc_align_attribute,
attr_alloc_exclusions },
{ "assume_aligned", 1, 2, false, true, true, false,
handle_assume_aligned_attribute, NULL },
{ "designated_init", 0, 0, false, true, false, false,
handle_designated_init_attribute, NULL },
{ "fallthrough", 0, 0, false, false, false, false,
handle_fallthrough_attribute, NULL },
{ "patchable_function_entry", 1, 2, true, false, false, false,
handle_patchable_function_entry_attribute,
NULL },
{ "nocf_check", 0, 0, false, true, true, true,
handle_nocf_check_attribute, NULL },
{ "symver", 1, -1, true, false, false, false,
handle_symver_attribute, NULL},
{ "copy", 1, 1, false, false, false, false,
handle_copy_attribute, NULL },
{ "noinit", 0, 0, true, false, false, false,
handle_special_var_sec_attribute, attr_section_exclusions },
{ "persistent", 0, 0, true, false, false, false,
handle_special_var_sec_attribute, attr_section_exclusions },
{ "access", 1, 3, false, true, true, false,
handle_access_attribute, NULL },
/* Attributes used by Objective-C. */
{ "NSObject", 0, 0, true, false, false, false,
handle_nsobject_attribute, NULL },
{ "objc_root_class", 0, 0, true, false, false, false,
handle_objc_root_class_attribute, NULL },
{ "objc_nullability", 1, 1, true, false, false, false,
handle_objc_nullability_attribute, NULL },
{ "*dealloc", 1, 2, true, false, false, false,
handle_dealloc_attribute, NULL },
{ "tainted_args", 0, 0, true, false, false, false,
handle_tainted_args_attribute, NULL },
{ NULL, 0, 0, false, false, false, false, NULL, NULL }
};
/* Give the specifications for the format attributes, used by C and all
descendants.
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,
affects_type_identity, handler, exclude } */
{ "format", 3, 3, false, true, true, false,
handle_format_attribute, NULL },
{ "format_arg", 1, 1, false, true, true, false,
handle_format_arg_attribute, NULL },
{ NULL, 0, 0, false, false, false, false, NULL, NULL }
};
/* 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)
|| !strcmp ("access", spec->name))
return true;
else
return targetm.attribute_takes_identifier_p (attr_id);
}
/* Verify that argument value POS at position ARGNO to attribute NAME
applied to function TYPE refers to a function parameter at position
POS and the expected type CODE. Treat CODE == INTEGER_TYPE as
matching all C integral types except bool. If successful, return
POS after default conversions, if any. Otherwise, issue appropriate
warnings and return null. A non-zero 1-based ARGNO should be passed
in by callers only for attributes with more than one argument. */
tree
positional_argument (const_tree fntype, const_tree atname, tree pos,
tree_code code, int argno /* = 0 */,
int flags /* = posargflags () */)
{
if (pos && TREE_CODE (pos) != IDENTIFIER_NODE
&& TREE_CODE (pos) != FUNCTION_DECL)
pos = default_conversion (pos);
tree postype = TREE_TYPE (pos);
if (pos == error_mark_node || !postype)
{
/* Only mention the positional argument number when it's non-zero. */
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument is invalid", atname);
else
warning (OPT_Wattributes,
"%qE attribute argument %i is invalid", atname, argno);
return NULL_TREE;
}
if (!INTEGRAL_TYPE_P (postype))
{
/* Handle this case specially to avoid mentioning the value
of pointer constants in diagnostics. Only mention
the positional argument number when it's non-zero. */
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument has type %qT",
atname, postype);
else
warning (OPT_Wattributes,
"%qE attribute argument %i has type %qT",
atname, argno, postype);
return NULL_TREE;
}
if (TREE_CODE (pos) != INTEGER_CST)
{
/* Only mention the argument number when it's non-zero. */
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument value %qE is not an integer "
"constant",
atname, pos);
else
warning (OPT_Wattributes,
"%qE attribute argument %i value %qE is not an integer "
"constant",
atname, argno, pos);
return NULL_TREE;
}
/* Argument positions are 1-based. */
if (integer_zerop (pos))
{
if (flags & POSARG_ZERO)
/* Zero is explicitly allowed. */
return pos;
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument value %qE does not refer to "
"a function parameter",
atname, pos);
else
warning (OPT_Wattributes,
"%qE attribute argument %i value %qE does not refer to "
"a function parameter",
atname, argno, pos);
return NULL_TREE;
}
if (!prototype_p (fntype))
return pos;
/* Verify that the argument position does not exceed the number
of formal arguments to the function. When POSARG_ELLIPSIS
is set, ARGNO may be beyond the last argument of a vararg
function. */
unsigned nargs = type_num_arguments (fntype);
if (!nargs
|| !tree_fits_uhwi_p (pos)
|| ((flags & POSARG_ELLIPSIS) == 0
&& !IN_RANGE (tree_to_uhwi (pos), 1, nargs)))
{
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument value %qE exceeds the number "
"of function parameters %u",
atname, pos, nargs);
else
warning (OPT_Wattributes,
"%qE attribute argument %i value %qE exceeds the number "
"of function parameters %u",
atname, argno, pos, nargs);
return NULL_TREE;
}
/* Verify that the type of the referenced formal argument matches
the expected type. */
unsigned HOST_WIDE_INT ipos = tree_to_uhwi (pos);
/* Zero was handled above. */
gcc_assert (ipos != 0);
if (tree argtype = type_argument_type (fntype, ipos))
{
if (argtype == error_mark_node)
return NULL_TREE;
if (flags & POSARG_ELLIPSIS)
{
if (argno < 1)
error ("%qE attribute argument value %qE does not refer to "
"a variable argument list",
atname, pos);
else
error ("%qE attribute argument %i value %qE does not refer to "
"a variable argument list",
atname, argno, pos);
return NULL_TREE;
}
/* Where the expected code is STRING_CST accept any pointer
expected by attribute format (this includes possibly qualified
char pointers and, for targets like Darwin, also pointers to
struct CFString). */
bool type_match;
if (code == STRING_CST)
type_match = valid_format_string_type_p (argtype);
else if (code == INTEGER_TYPE)
/* For integers, accept enums, wide characters and other types
that match INTEGRAL_TYPE_P except for bool. */
type_match = (INTEGRAL_TYPE_P (argtype)
&& TREE_CODE (argtype) != BOOLEAN_TYPE);
else
type_match = TREE_CODE (argtype) == code;
if (!type_match)
{
if (code == STRING_CST)
{
/* Reject invalid format strings with an error. */
if (argno < 1)
error ("%qE attribute argument value %qE refers to "
"parameter type %qT",
atname, pos, argtype);
else
error ("%qE attribute argument %i value %qE refers to "
"parameter type %qT",
atname, argno, pos, argtype);
return NULL_TREE;
}
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument value %qE refers to "
"parameter type %qT",
atname, pos, argtype);
else
warning (OPT_Wattributes,
"%qE attribute argument %i value %qE refers to "
"parameter type %qT",
atname, argno, pos, argtype);
return NULL_TREE;
}
}
else if (!(flags & POSARG_ELLIPSIS))
{
if (argno < 1)
warning (OPT_Wattributes,
"%qE attribute argument value %qE refers to "
"a variadic function parameter of unknown type",
atname, pos);
else
warning (OPT_Wattributes,
"%qE attribute argument %i value %qE refers to "
"a variadic function parameter of unknown type",
atname, argno, pos);
return NULL_TREE;
}
return pos;
}
/* Return the first of DECL or TYPE attributes installed in NODE if it's
a DECL, or TYPE attributes if it's a TYPE, or null otherwise. */
static tree
decl_or_type_attrs (tree node)
{
if (DECL_P (node))
{
if (tree attrs = DECL_ATTRIBUTES (node))
return attrs;
tree type = TREE_TYPE (node);
if (type == error_mark_node)
return NULL_TREE;
return TYPE_ATTRIBUTES (type);
}
if (TYPE_P (node))
return TYPE_ATTRIBUTES (node);
return NULL_TREE;
}
/* Given a pair of NODEs for arbitrary DECLs or TYPEs, validate one or
two integral or string attribute arguments NEWARGS to be applied to
NODE[0] for the absence of conflicts with the same attribute arguments
already applied to NODE[1]. Issue a warning for conflicts and return
false. Otherwise, when no conflicts are found, return true. */
static bool
validate_attr_args (tree node[2], tree name, tree newargs[2])
{
/* First validate the arguments against those already applied to
the same declaration (or type). */
tree self[2] = { node[0], node[0] };
if (node[0] != node[1] && !validate_attr_args (self, name, newargs))
return false;
if (!node[1])
return true;
/* Extract the same attribute from the previous declaration or type. */
tree prevattr = decl_or_type_attrs (node[1]);
const char* const namestr = IDENTIFIER_POINTER (name);
prevattr = lookup_attribute (namestr, prevattr);
if (!prevattr)
return true;
/* Extract one or both attribute arguments. */
tree prevargs[2];
prevargs[0] = TREE_VALUE (TREE_VALUE (prevattr));
prevargs[1] = TREE_CHAIN (TREE_VALUE (prevattr));
if (prevargs[1])
prevargs[1] = TREE_VALUE (prevargs[1]);
/* Both arguments must be equal or, for the second pair, neither must
be provided to succeed. */
bool arg1eq, arg2eq;
if (TREE_CODE (newargs[0]) == INTEGER_CST)
{
arg1eq = tree_int_cst_equal (newargs[0], prevargs[0]);
if (newargs[1] && prevargs[1])
arg2eq = tree_int_cst_equal (newargs[1], prevargs[1]);
else
arg2eq = newargs[1] == prevargs[1];
}
else if (TREE_CODE (newargs[0]) == STRING_CST)
{
const char *s0 = TREE_STRING_POINTER (newargs[0]);
const char *s1 = TREE_STRING_POINTER (prevargs[0]);
arg1eq = strcmp (s0, s1) == 0;
if (newargs[1] && prevargs[1])
{
s0 = TREE_STRING_POINTER (newargs[1]);
s1 = TREE_STRING_POINTER (prevargs[1]);
arg2eq = strcmp (s0, s1) == 0;
}
else
arg2eq = newargs[1] == prevargs[1];
}
else
gcc_unreachable ();
if (arg1eq && arg2eq)
return true;
/* If the two locations are different print a note pointing to
the previous one. */
const location_t curloc = input_location;
const location_t prevloc =
DECL_P (node[1]) ? DECL_SOURCE_LOCATION (node[1]) : curloc;
/* Format the attribute specification for convenience. */
char newspec[80], prevspec[80];
if (newargs[1])
snprintf (newspec, sizeof newspec, "%s (%s, %s)", namestr,
print_generic_expr_to_str (newargs[0]),
print_generic_expr_to_str (newargs[1]));
else
snprintf (newspec, sizeof newspec, "%s (%s)", namestr,
print_generic_expr_to_str (newargs[0]));
if (prevargs[1])
snprintf (prevspec, sizeof prevspec, "%s (%s, %s)", namestr,
print_generic_expr_to_str (prevargs[0]),
print_generic_expr_to_str (prevargs[1]));
else
snprintf (prevspec, sizeof prevspec, "%s (%s)", namestr,
print_generic_expr_to_str (prevargs[0]));
if (warning_at (curloc, OPT_Wattributes,
"ignoring attribute %qs because it conflicts "
"with previous %qs",
newspec, prevspec)
&& curloc != prevloc)
inform (prevloc, "previous declaration here");
return false;
}
/* Convenience wrapper for validate_attr_args to validate a single
attribute argument. Used by handlers for attributes that take
just a single argument. */
static bool
validate_attr_arg (tree node[2], tree name, tree newarg)
{
tree argarray[2] = { newarg, NULL_TREE };
return validate_attr_args (node, name, argarray);
}
/* Attribute handlers common to C front ends. */
/* Handle a "signed_bool_precision" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_signed_bool_precision_attribute (tree *node, tree name, tree args,
int, bool *no_add_attrs)
{
*no_add_attrs = true;
if (!flag_gimple)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
if (!TYPE_P (*node) || TREE_CODE (*node) != BOOLEAN_TYPE)
{
warning (OPT_Wattributes, "%qE attribute only supported on "
"boolean types", name);
return NULL_TREE;
}
unsigned HOST_WIDE_INT prec = HOST_WIDE_INT_M1U;
if (tree_fits_uhwi_p (TREE_VALUE (args)))
prec = tree_to_uhwi (TREE_VALUE (args));
if (prec > MAX_FIXED_MODE_SIZE)
{
warning (OPT_Wattributes, "%qE attribute with unsupported boolean "
"precision", name);
return NULL_TREE;
}
tree new_type = build_nonstandard_boolean_type (prec);
*node = lang_hooks.types.reconstruct_complex_type (*node, new_type);
return NULL_TREE;
}
/* 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))
{
warning (OPT_Wattributes,
"%qE attribute ignored for type %qT", name, *node);
*no_add_attrs = true;
}
else
TYPE_PACKED (*node) = 1;
}
else if (TREE_CODE (*node) == FIELD_DECL)
{
if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT
/* Still pack bitfields. */
&& ! DECL_C_BIT_FIELD (*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. */
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)
{
/* Attribute 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)
{
/* Attribute cold processing is done later with lookup_attribute. */
}
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Add FLAGS for a function NODE to no_sanitize_flags in DECL_ATTRIBUTES. */
void
add_no_sanitize_value (tree node, unsigned int flags)
{
tree attr = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (node));
if (attr)
{
unsigned int old_value = tree_to_uhwi (TREE_VALUE (attr));
flags |= old_value;
if (flags == old_value)
return;
TREE_VALUE (attr) = build_int_cst (unsigned_type_node, flags);
}
else
DECL_ATTRIBUTES (node)
= tree_cons (get_identifier ("no_sanitize"),
build_int_cst (unsigned_type_node, flags),
DECL_ATTRIBUTES (node));
}
/* Handle a "no_sanitize" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_sanitize_attribute (tree *node, tree name, tree args, int,
bool *no_add_attrs)
{
unsigned int flags = 0;
*no_add_attrs = true;
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
return NULL_TREE;
}
for (; args; args = TREE_CHAIN (args))
{
tree id = TREE_VALUE (args);
if (TREE_CODE (id) != STRING_CST)
{
error ("%qE argument not a string", name);
return NULL_TREE;
}
char *string = ASTRDUP (TREE_STRING_POINTER (id));
flags |= parse_no_sanitize_attribute (string);
}
add_no_sanitize_value (*node, flags);
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)
{
*no_add_attrs = true;
if (TREE_CODE (*node) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
add_no_sanitize_value (*node, SANITIZE_ADDRESS);
return NULL_TREE;
}
/* Handle a "no_sanitize_thread" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_sanitize_thread_attribute (tree *node, tree name, tree, int,
bool *no_add_attrs)
{
*no_add_attrs = true;
if (TREE_CODE (*node) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
add_no_sanitize_value (*node, SANITIZE_THREAD);
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)
{
*no_add_attrs = true;
if (TREE_CODE (*node) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
add_no_sanitize_value (*node, SANITIZE_ADDRESS);
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)
{
*no_add_attrs = true;
if (TREE_CODE (*node) != FUNCTION_DECL)
warning (OPT_Wattributes, "%qE attribute ignored", name);
else
add_no_sanitize_value (*node,
SANITIZE_UNDEFINED | SANITIZE_UNDEFINED_NONDEFAULT);
return NULL_TREE;
}
/* Handle a "no_sanitize_coverage" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_sanitize_coverage_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;
}
return NULL_TREE;
}
/* Handle a "no_stack_protector" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_no_stack_protector_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 "noipa" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_noipa_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 "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 "nocf_check" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_nocf_check_attribute (tree *node, tree name,
tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_TYPE
&& TREE_CODE (*node) != METHOD_TYPE)
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
else if (!(flag_cf_protection & CF_BRANCH))
{
warning (OPT_Wattributes, "%qE attribute ignored. Use "
"%<-fcf-protection%> option to enable it",
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) == FIELD_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 "retain" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_retain_attribute (tree *pnode, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree node = *pnode;
if (SUPPORTS_SHF_GNU_RETAIN
&& (TREE_CODE (node) == FUNCTION_DECL
|| (VAR_P (node) && TREE_STATIC (node))))
;
else
{
warning (OPT_Wattributes, "%qE attribute ignored", name);
*no_add_attrs = true;
}
return NULL_TREE;
}
/* Handle an "uninitialized" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_uninitialized_attribute (tree *node, tree name, tree ARG_UNUSED (args),
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree decl = *node;
if (!VAR_P (decl))
{
warning (OPT_Wattributes, "%qE attribute ignored because %qD "
"is not a variable", name, decl);
*no_add_attrs = true;
}
else if (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
{
warning (OPT_Wattributes, "%qE attribute ignored because %qD "
"is not a local variable", name, decl);
*no_add_attrs = true;
}
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 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;
}
/* void __builtin_unreachable(void) is const. Accept other such
built-ins but warn on user-defined functions that return void. */
if (!(flags & ATTR_FLAG_BUILT_IN)
&& TREE_CODE (*node) == FUNCTION_DECL
&& VOID_TYPE_P (TREE_TYPE (type)))
warning (OPT_Wattributes, "%qE attribute on function "
"returning %<void%>", name);
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 ("%qE attribute is not supported because endianness is not uniform",
name);
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 ("attribute %qE argument must be one of %qs or %qs",
name, "big-endian", "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 (OPT_Wprio_ctor_dtor,
"destructor priorities from 0 to %d are reserved "
"for the implementation",
MAX_RESERVED_INIT_PRIORITY);
else
warning (OPT_Wprio_ctor_dtor,
"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);
/* 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;
/* 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 (GET_MODE_INNER (mode));
}
/* 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;
}
/* Allow the target a chance to translate MODE into something supported.
See PR86324. */
mode = targetm.translate_mode_attribute (mode);
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 (as_a <scalar_mode> (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");
inform (input_location,
"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))
{
scalar_int_mode addr_mode;
addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type));
tree (*fn)(tree, machine_mode, bool);
if (!is_a <scalar_int_mode> (mode, &addr_mode)
|| !targetm.addr_space.valid_pointer_mode (addr_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), addr_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 enumerated 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;
}
*no_add_attrs = false;
}
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 name, tree args,
int flags, bool *no_add_attrs)
{
tree decl = *node;
tree res = NULL_TREE;
tree argval = TREE_VALUE (args);
const char* new_section_name;
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 (argval) != 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;
}
new_section_name = TREE_STRING_POINTER (argval);
/* The decl may have already been given a section attribute
from a previous declaration. Ensure they match. */
if (const char* const old_section_name = DECL_SECTION_NAME (decl))
if (strcmp (old_section_name, new_section_name) != 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;
}
if (!validate_attr_arg (node, name, argval))
goto fail;
res = targetm.handle_generic_attribute (node, name, args, flags,
no_add_attrs);
/* If the back end confirms the attribute can be added then continue onto
final processing. */
if (!(*no_add_attrs))
{
set_decl_section_name (decl, new_section_name);
return res;
}
fail:
*no_add_attrs = true;
return res;
}
/* Common codes shared by handle_warn_if_not_aligned_attribute and
handle_aligned_attribute. */
static tree
common_handle_aligned_attribute (tree *node, tree name, tree args, int flags,
bool *no_add_attrs,
bool warn_if_not_aligned_p)
{
tree decl = NULL_TREE;
tree *type = NULL;
bool is_type = false;
tree align_expr;
/* The last (already pushed) declaration with all validated attributes
merged in or the current about-to-be-pushed one if one hasn't been
yet. */
tree last_decl = node[1] ? node[1] : *node;
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 = true;
/* True to consider invalid alignments greater than MAX_OFILE_ALIGNMENT. */
bool objfile = (TREE_CODE (*node) == FUNCTION_DECL
|| (VAR_P (*node) && TREE_STATIC (*node)));
/* Log2 of specified alignment. */
int pow2align = check_user_alignment (align_expr, objfile,
/* warn_zero = */ true);
if (pow2align == -1)
{
*no_add_attrs = true;
return NULL_TREE;
}
/* The alignment in bits corresponding to the specified alignment. */
unsigned bitalign = (1U << pow2align) * BITS_PER_UNIT;
/* The alignment of the current declaration and that of the last
pushed declaration, determined on demand below. */
unsigned curalign = 0;
unsigned lastalign = 0;
/* True when SET_DECL_ALIGN() should be called for the decl when
*NO_ADD_ATTRS is false. */
bool set_align = true;
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);
if (warn_if_not_aligned_p)
{
SET_TYPE_WARN_IF_NOT_ALIGN (*type, bitalign);
warn_if_not_aligned_p = false;
}
else
{
SET_TYPE_ALIGN (*type, bitalign);
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 (TREE_CODE (decl) == FUNCTION_DECL
&& (((curalign = DECL_ALIGN (decl)) > bitalign)
| ((lastalign = DECL_ALIGN (last_decl)) > bitalign)))
{
/* Either a prior attribute on the same declaration or one
on a prior declaration of the same function specifies
stricter alignment than this attribute. */
bool note = (lastalign > curalign
|| (lastalign == curalign
&& (DECL_USER_ALIGN (last_decl)
> DECL_USER_ALIGN (decl))));
if (note)
curalign = lastalign;
curalign /= BITS_PER_UNIT;
unsigned newalign = bitalign / BITS_PER_UNIT;
auto_diagnostic_group d;
if ((DECL_USER_ALIGN (decl)
|| DECL_USER_ALIGN (last_decl)))
{
if (warning (OPT_Wattributes,
"ignoring attribute %<%E (%u)%> because it conflicts "
"with attribute %<%E (%u)%>",
name, newalign, name, curalign)
&& note)
inform (DECL_SOURCE_LOCATION (last_decl),
"previous declaration here");
/* Only reject attempts to relax/override an alignment
explicitly specified previously and accept declarations
that appear to relax the implicit function alignment for
the target. Both increasing and increasing the alignment
set by -falign-functions setting is permitted. */
*no_add_attrs = true;
}
else if (!warn_if_not_aligned_p)
{
/* Do not fail for attribute warn_if_not_aligned. Otherwise,
silently avoid applying the alignment to the declaration
because it's implicitly satisfied by the target. Apply
the attribute nevertheless so it can be retrieved by
__builtin_has_attribute. */
set_align = false;
}
}
else if (DECL_USER_ALIGN (decl)
&& DECL_ALIGN (decl) > bitalign)
/* 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 (warn_if_not_aligned_p
&& TREE_CODE (decl) == FIELD_DECL
&& !DECL_C_BIT_FIELD (decl))
{
SET_DECL_WARN_IF_NOT_ALIGN (decl, bitalign);
warn_if_not_aligned_p = false;
set_align = false;
}
if (warn_if_not_aligned_p)
{
error ("%<warn_if_not_aligned%> may not be specified for %q+D",
decl);
*no_add_attrs = true;
}
else if (!is_type && !*no_add_attrs && set_align)
{
SET_DECL_ALIGN (decl, bitalign);
DECL_USER_ALIGN (decl) = 1;
}
return NULL_TREE;
}
/* Handle a "aligned" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_aligned_attribute (tree *node, tree name, tree args,
int flags, bool *no_add_attrs)
{
return common_handle_aligned_attribute (node, name, args, flags,
no_add_attrs, false);
}
/* Handle a "warn_if_not_aligned" attribute; arguments as in
struct attribute_spec.handler. */
static tree
handle_warn_if_not_aligned_attribute (tree *node, tree name,
tree args, int flags,
bool *no_add_attrs)
{
return common_handle_aligned_attribute (node, name, args, flags,
no_add_attrs, true);
}
/* 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 "noinit" or "persistent" attribute; arguments as in
struct attribute_spec.handler.
This generic handler is used for "special variable sections" that allow the
section name to be set using a dedicated attribute. Additional validation
is performed for the specific properties of the section corresponding to the
attribute.
The ".noinit" section *is not* loaded by the program loader, and is not
initialized by the runtime startup code.
The ".persistent" section *is* loaded by the program loader, but is not
initialized by the runtime startup code. */
static tree
handle_special_var_sec_attribute (tree *node, tree name, tree args,
int flags, bool *no_add_attrs)
{
tree decl = *node;
tree res = NULL_TREE;
/* First perform generic validation common to "noinit" and "persistent"
attributes. */
if (!targetm_common.have_named_sections)
{
error_at (DECL_SOURCE_LOCATION (decl),
"section attributes are not supported for this target");
goto fail;
}
if (!VAR_P (decl))
{
warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
"ignoring %qE attribute not set on a variable",
name);
goto fail;
}
if (VAR_P (decl)
&& current_function_decl != NULL_TREE
&& !TREE_STATIC (decl))
{
error_at (DECL_SOURCE_LOCATION (decl),
"%qE attribute cannot be specified for local variables",
name);
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", decl);
goto fail;
}
if (!targetm.have_switchable_bss_sections)
{
error ("%qE attribute is specific to ELF targets", name);
goto fail;
}
if (TREE_READONLY (decl))
{
warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
"ignoring %qE attribute set on const variable",
name);
goto fail;
}
/* Now validate noinit/persistent individually. */
if (strcmp (IDENTIFIER_POINTER (name), "noinit") == 0)
{
if (DECL_INITIAL (decl))
{
warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
"ignoring %qE attribute set on initialized variable",
name);
goto fail;
}
/* If this var is thought to be common, then change this. "noinit"
variables must be placed in an explicit ".noinit" section. */
DECL_COMMON (decl) = 0;
}
else if (strcmp (IDENTIFIER_POINTER (name), "persistent") == 0)
{
if (DECL_COMMON (decl) || DECL_INITIAL (decl) == NULL_TREE)
{
warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
"ignoring %qE attribute set on uninitialized variable",
name);
goto fail;
}
}
else
gcc_unreachable ();
res = targetm.handle_generic_attribute (node, name, args, flags,
no_add_attrs);
/* If the back end confirms the attribute can be added then continue onto
final processing. */
if (!(*no_add_attrs))
return res;
fail:
*no_add_attrs = true;
return res;
}
/* 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 a "symver" attribute. */
static tree
handle_symver_attribute (tree *node, tree ARG_UNUSED (name), tree args,
int ARG_UNUSED (flags), bool *no_add_attrs)
{
tree symver;
const char *symver_str;
if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
{
warning (OPT_Wattributes,
"%<symver%> attribute only applies to functions and variables");
*no_add_attrs = true;
return NULL_TREE;
}
if (!decl_in_symtab_p (*node))
{
warning (OPT_Wattributes,
"%<symver%> attribute is only applicable to symbols");
*no_add_attrs = true;
return NULL_TREE;
}
for (; args; args = TREE_CHAIN (args))
{
symver = TREE_VALUE (args);
if (TREE_CODE (symver) != STRING_CST)
{
error ("%<symver%> attribute argument not a string constant");
*no_add_attrs = true;
return NULL_TREE;
}
symver_str = TREE_STRING_POINTER (symver);
int ats = 0;
for (int n = 0; (int)n < TREE_STRING_LENGTH (symver); n++)
if (symver_str[n] == '@')
ats++;
if (ats != 1 && ats != 2)
{
error ("symver attribute argument must have format %<name@nodename%>");
error ("%<symver%> attribute argument %qs must contain one or two "
"%<@%>", symver_str);
*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)
error ("%+qD declared %qs after being used",
decl, is_alias ? "alias" : "ifunc");
}
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 the "copy" attribute NAME by copying the set of attributes
from the symbol referenced by ARGS to the declaration of *NODE. */
static tree
handle_copy_attribute (tree *node, tree name, tree args,
int flags, bool *no_add_attrs)
{
/* Do not apply the copy attribute itself. It serves no purpose
other than to copy other attributes. */
*no_add_attrs = true;
tree decl = *node;
tree ref = TREE_VALUE (args);
if (ref == error_mark_node)
return NULL_TREE;
if (TREE_CODE (ref) == STRING_CST)
{
/* Explicitly handle this case since using a string literal
as an argument is a likely mistake. */
error_at (DECL_SOURCE_LOCATION (decl),
"%qE attribute argument cannot be a string",
name);
return NULL_TREE;
}
if (CONSTANT_CLASS_P (ref)
&& (INTEGRAL_TYPE_P (TREE_TYPE (ref))
|| FLOAT_TYPE_P (TREE_TYPE (ref))))
{
/* Similar to the string case, since some function attributes
accept literal numbers as arguments (e.g., alloc_size or
nonnull) using one here is a likely mistake. */
error_at (DECL_SOURCE_LOCATION (decl),
"%qE attribute argument cannot be a constant arithmetic "
"expression",
name);
return NULL_TREE;
}
if (ref == node[1])
{
/* Another possible mistake (but indirect self-references aren't
and diagnosed and shouldn't be). */
if (warning_at (DECL_SOURCE_LOCATION (decl), OPT_Wattributes,
"%qE attribute ignored on a redeclaration "
"of the referenced symbol",
name))
inform (DECL_SOURCE_LOCATION (node[1]),
"previous declaration here");
return NULL_TREE;
}
/* Consider address-of expressions in the attribute argument
as requests to copy from the referenced entity. */
if (TREE_CODE (ref) == ADDR_EXPR)
ref = TREE_OPERAND (ref, 0);
do
{
/* Drill down into references to find the referenced decl. */
tree_code refcode = TREE_CODE (ref);
if (refcode == ARRAY_REF
|| refcode == INDIRECT_REF)
ref = TREE_OPERAND (ref, 0);
else if (refcode == COMPONENT_REF)
ref = TREE_OPERAND (ref, 1);
else
break;
} while (!DECL_P (ref));
/* For object pointer expressions, consider those to be requests
to copy from their type, such as in:
struct __attribute__ (copy ((struct T *)0)) U { ... };
which copies type attributes from struct T to the declaration
of struct U. */
if ((CONSTANT_CLASS_P (ref) || EXPR_P (ref))
&& POINTER_TYPE_P (TREE_TYPE (ref))
&& !FUNCTION_POINTER_TYPE_P (TREE_TYPE (ref)))
ref = TREE_TYPE (ref);
tree reftype = TYPE_P (ref) ? ref : TREE_TYPE (ref);
if (DECL_P (decl))
{
if ((VAR_P (decl)
&& (TREE_CODE (ref) == FUNCTION_DECL
|| (EXPR_P (ref)
&& POINTER_TYPE_P (reftype)
&& FUNC_OR_METHOD_TYPE_P (TREE_TYPE (reftype)))))
|| (TREE_CODE (decl) == FUNCTION_DECL
&& (VAR_P (ref)
|| (EXPR_P (ref)
&& !FUNC_OR_METHOD_TYPE_P (reftype)
&& (!POINTER_TYPE_P (reftype)
|| !FUNC_OR_METHOD_TYPE_P (TREE_TYPE (reftype)))))))
{
/* It makes no sense to try to copy function attributes
to a variable, or variable attributes to a function. */
if (warning (OPT_Wattributes,
"%qE attribute ignored on a declaration of "
"a different kind than referenced symbol",
name)
&& DECL_P (ref))
inform (DECL_SOURCE_LOCATION (ref),
"symbol %qD referenced by %qD declared here", ref, decl);
return NULL_TREE;
}
tree attrs = NULL_TREE;
if (DECL_P (ref))
attrs = DECL_ATTRIBUTES (ref);
else if (TYPE_P (ref))
attrs = TYPE_ATTRIBUTES (ref);
/* Copy decl attributes from REF to DECL. */
for (tree at = attrs; at; at = TREE_CHAIN (at))
{
/* Avoid copying attributes that affect a symbol linkage,
inlining, or visibility since those in all likelihood
only apply to the target.
FIXME: make it possible to specify which attributes to
copy or not to copy in the copy attribute itself. */
tree atname = get_attribute_name (at);
if