Mercurial > hg > CbC > CbC_gcc
view gcc/c-family/c-attribs.c @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
line wrap: on
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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_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_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_nocf_check_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_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_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_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_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_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 *); static tree handle_patchable_function_entry_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 }, { "noipa", 0, 0, true, false, false, handle_noipa_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 }, { "warn_if_not_aligned", 0, 1, false, false, false, handle_warn_if_not_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 }, { "nonstring", 0, 0, true, false, false, handle_nonstring_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", 1, 1, true, false, false, handle_no_sanitize_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_thread_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 }, { "patchable_function_entry", 1, 2, true, false, false, handle_patchable_function_entry_attribute, false }, { "nocf_check", 0, 0, false, true, true, handle_nocf_check_attribute, true }, { 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_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. */ 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; } /* 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) { *no_add_attrs = true; tree id = TREE_VALUE (args); if (TREE_CODE (*node) != FUNCTION_DECL) { warning (OPT_Wattributes, "%qE attribute ignored", name); return NULL_TREE; } if (TREE_CODE (id) != STRING_CST) { error ("no_sanitize argument not a string"); return NULL_TREE; } char *string = ASTRDUP (TREE_STRING_POINTER (id)); unsigned int 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 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 "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) == 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); /* 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; } 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"); 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)) { 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 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; } /* Common codes shared by handle_warn_if_not_aligned_attribute and handle_aligned_attribute. */ static tree common_handle_aligned_attribute (tree *node, tree args, int flags, bool *no_add_attrs, bool warn_if_not_aligned_p) { 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); if (warn_if_not_aligned_p) { SET_TYPE_WARN_IF_NOT_ALIGN (*type, (1U << i) * BITS_PER_UNIT); warn_if_not_aligned_p = false; } else { 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 (!warn_if_not_aligned_p && TREE_CODE (decl) == FUNCTION_DECL && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) { /* Don't warn function alignment here if warn_if_not_aligned_p is true. It will be warned later. */ 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 { if (warn_if_not_aligned_p) { if (TREE_CODE (decl) == FIELD_DECL && !DECL_C_BIT_FIELD (decl)) { SET_DECL_WARN_IF_NOT_ALIGN (decl, (1U << i) * BITS_PER_UNIT); warn_if_not_aligned_p = false; } } else { SET_DECL_ALIGN (decl, (1U << i) * BITS_PER_UNIT); DECL_USER_ALIGN (decl) = 1; } } if (warn_if_not_aligned_p) { error ("%<warn_if_not_aligned%> may not be specified for %q+D", decl); *no_add_attrs = true; } return NULL_TREE; } /* 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) { return common_handle_aligned_attribute (node, 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 ARG_UNUSED (name), tree args, int flags, bool *no_add_attrs) { return common_handle_aligned_attribute (node, 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 "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 ("%+qD declared alias after being used", decl); else error ("%+qD 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 ("%+qD 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 the "nonstring" variable attribute. */ static tree handle_nonstring_attribute (tree *node, tree name, tree ARG_UNUSED (args), int ARG_UNUSED (flags), bool *no_add_attrs) { gcc_assert (!args); tree_code code = TREE_CODE (*node); if (VAR_P (*node) || code == FIELD_DECL || code == PARM_DECL) { tree type = TREE_TYPE (*node); if (POINTER_TYPE_P (type) || TREE_CODE (type) == ARRAY_TYPE) { tree eltype = TREE_TYPE (type); if (eltype == char_type_node) return NULL_TREE; } warning (OPT_Wattributes, "%qE attribute ignored on objects of type %qT", name, type); *no_add_attrs = true; return NULL_TREE; } if (code == FUNCTION_DECL) warning (OPT_Wattributes, "%qE attribute does not apply to functions", name); else if (code == TYPE_DECL) warning (OPT_Wattributes, "%qE attribute does not apply to types", name); else warning (OPT_Wattributes, "%qE attribute ignored", name); *no_add_attrs = true; 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))) { warning (OPT_Wattributes, "%qE attribute ignored due to conflict " "with %qs attribute", name, "target_clones"); *no_add_attrs = true; } else if (! targetm.target_option.valid_attribute_p (*node, name, args, flags)) *no_add_attrs = true; /* Check that there's no empty string in values of the attribute. */ for (tree t = args; t != NULL_TREE; t = TREE_CHAIN (t)) { tree value = TREE_VALUE (t); if (TREE_CODE (value) == STRING_CST && TREE_STRING_LENGTH (value) == 1 && TREE_STRING_POINTER (value)[0] == '\0') { warning (OPT_Wattributes, "empty string in attribute %<target%>"); *no_add_attrs = true; } } return NULL_TREE; } /* Handle a "target_clones" attribute. */ static tree handle_target_clones_attribute (tree *node, tree name, tree ARG_UNUSED (args), int ARG_UNUSED (flags), bool *no_add_attrs) { /* Ensure we have a function type. */ if (TREE_CODE (*node) == FUNCTION_DECL) { if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node))) { warning (OPT_Wattributes, "%qE attribute ignored due to conflict " "with %qs attribute", name, "always_inline"); *no_add_attrs = true; } else if (lookup_attribute ("target", DECL_ATTRIBUTES (*node))) { warning (OPT_Wattributes, "%qE attribute ignored due to conflict " "with %qs attribute", name, "target"); *no_add_attrs = true; } else /* Do not inline functions with multiple clone targets. */ DECL_UNINLINABLE (*node) = 1; } else { warning (OPT_Wattributes, "%qE attribute ignored", name); *no_add_attrs = true; } return NULL_TREE; } /* For handling "optimize" attribute. arguments as in struct attribute_spec.handler. */ static tree handle_optimize_attribute (tree *node, tree name, tree args, int ARG_UNUSED (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 { struct cl_optimization cur_opts; tree old_opts = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node); /* Save current options. */ cl_optimization_save (&cur_opts, &global_options); /* If we previously had some optimization options, use them as the default. */ if (old_opts) cl_optimization_restore (&global_options, TREE_OPTIMIZATION (old_opts)); /* Parse options, and update the vector. */ parse_optimize_options (args, true); DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) = build_optimization_node (&global_options); /* Restore current options. */ cl_optimization_restore (&global_options, &cur_opts); } return NULL_TREE; } /* Handle a "no_split_stack" attribute. */ static tree handle_no_split_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; } return NULL_TREE; } /* Handle a "returns_nonnull" attribute; arguments as in struct attribute_spec.handler. */ static tree handle_returns_nonnull_attribute (tree *node, tree, tree, int, bool *no_add_attrs) { // Even without a prototype we still have a return type we can check. if (TREE_CODE (TREE_TYPE (*node)) != POINTER_TYPE) { error ("returns_nonnull attribute on a function not returning a pointer"); *no_add_attrs = true; } return NULL_TREE; } /* Handle a "designated_init" attribute; arguments as in struct attribute_spec.handler. */ static tree handle_designated_init_attribute (tree *node, tree name, tree, int, bool *no_add_attrs) { if (TREE_CODE (*node) != RECORD_TYPE) { error ("%qE attribute is only valid on %<struct%> type", name); *no_add_attrs = true; } return NULL_TREE; } /* Handle a "fallthrough" attribute; arguments as in struct attribute_spec.handler. */ static tree handle_fallthrough_attribute (tree *, tree name, tree, int, bool *no_add_attrs) { warning (OPT_Wattributes, "%qE attribute ignored", name); *no_add_attrs = true; return NULL_TREE; } static tree handle_patchable_function_entry_attribute (tree *, tree, tree, int, bool *) { /* Nothing to be done here. */ return NULL_TREE; }