From b12b1915d8daa6fd271a15791f19b5724428d38f Mon Sep 17 00:00:00 2001 From: Marek Polacek Date: Mon, 17 Oct 2016 13:04:38 +0000 Subject: [PATCH] Makefile.in (C_COMMON_OBJS): Add c-family/c-attribs.o. * Makefile.in (C_COMMON_OBJS): Add c-family/c-attribs.o. * c-attribs.c: New file. * c-common.c: Move attributes handling to c-attribs.c. (get_nonnull_operand): No longer static. * c-common.h: Move the declarations from c-attribs.c to its own section. From-SVN: r241238 --- gcc/ChangeLog | 4 + gcc/Makefile.in | 2 +- gcc/c-family/ChangeLog | 7 + gcc/c-family/c-attribs.c | 3163 ++++++++++++++++++++++++++++++++++ gcc/c-family/c-common.c | 3474 ++------------------------------------ gcc/c-family/c-common.h | 17 +- 6 files changed, 3365 insertions(+), 3302 deletions(-) create mode 100644 gcc/c-family/c-attribs.c diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ad04a21c0b3..b5e65289366 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2016-10-17 Marek Polacek + + * Makefile.in (C_COMMON_OBJS): Add c-family/c-attribs.o. + 2016-10-17 Richard Biener * bb-reorder.c (reorder_basic_blocks_simple): Clear BB_VISITED diff --git a/gcc/Makefile.in b/gcc/Makefile.in index d6e44e4b779..c512cd70970 100644 --- a/gcc/Makefile.in +++ b/gcc/Makefile.in @@ -1183,7 +1183,7 @@ C_COMMON_OBJS = c-family/c-common.o c-family/c-cppbuiltin.o c-family/c-dump.o \ c-family/c-semantics.o c-family/c-ada-spec.o \ c-family/c-cilkplus.o \ c-family/array-notation-common.o c-family/cilk.o c-family/c-ubsan.o \ - c-family/c-warn.o + c-family/c-attribs.o c-family/c-warn.o # Language-independent object files. # We put the *-match.o and insn-*.o files first so that a parallel make diff --git a/gcc/c-family/ChangeLog b/gcc/c-family/ChangeLog index 475cd7d4860..64eccee3b77 100644 --- a/gcc/c-family/ChangeLog +++ b/gcc/c-family/ChangeLog @@ -1,3 +1,10 @@ +2016-10-17 Marek Polacek + + * c-attribs.c: New file. + * c-common.c: Move attributes handling to c-attribs.c. + (get_nonnull_operand): No longer static. + * c-common.h: Move the declarations from c-attribs.c to its own section. + 2016-10-14 Jason Merrill * c-cppbuiltin.c (c_cpp_builtins): Define __cpp_aggregate_bases diff --git a/gcc/c-family/c-attribs.c b/gcc/c-family/c-attribs.c new file mode 100644 index 00000000000..925f1b20c50 --- /dev/null +++ b/gcc/c-family/c-attribs.c @@ -0,0 +1,3163 @@ +/* C-family attributes handling. + Copyright (C) 1992-2016 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 +. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "target.h" +#include "function.h" +#include "tree.h" +#include "memmodel.h" +#include "c-common.h" +#include "gimple-expr.h" +#include "tm_p.h" +#include "stringpool.h" +#include "cgraph.h" +#include "diagnostic.h" +#include "intl.h" +#include "stor-layout.h" +#include "calls.h" +#include "attribs.h" +#include "varasm.h" +#include "trans-mem.h" +#include "c-objc.h" +#include "common/common-target.h" +#include "langhooks.h" +#include "tree-inline.h" +#include "toplev.h" +#include "tree-iterator.h" +#include "opts.h" +#include "gimplify.h" + +static tree handle_packed_attribute (tree *, tree, tree, int, bool *); +static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); +static tree handle_common_attribute (tree *, tree, tree, int, bool *); +static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); +static tree handle_hot_attribute (tree *, tree, tree, int, bool *); +static tree handle_cold_attribute (tree *, tree, tree, int, bool *); +static tree handle_no_sanitize_address_attribute (tree *, tree, tree, + int, bool *); +static tree handle_no_address_safety_analysis_attribute (tree *, tree, tree, + int, bool *); +static tree handle_no_sanitize_undefined_attribute (tree *, tree, tree, int, + bool *); +static tree handle_stack_protect_attribute (tree *, tree, tree, int, bool *); +static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); +static tree handle_noclone_attribute (tree *, tree, tree, int, bool *); +static tree handle_noicf_attribute (tree *, tree, tree, int, bool *); +static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); +static tree handle_always_inline_attribute (tree *, tree, tree, int, + bool *); +static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *); +static tree handle_artificial_attribute (tree *, tree, tree, int, bool *); +static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); +static tree handle_error_attribute (tree *, tree, tree, int, bool *); +static tree handle_used_attribute (tree *, tree, tree, int, bool *); +static tree handle_externally_visible_attribute (tree *, tree, tree, int, + bool *); +static tree handle_no_reorder_attribute (tree *, tree, tree, int, + bool *); +static tree handle_const_attribute (tree *, tree, tree, int, bool *); +static tree handle_transparent_union_attribute (tree *, tree, tree, + int, bool *); +static tree handle_scalar_storage_order_attribute (tree *, tree, tree, + int, bool *); +static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); +static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); +static tree handle_mode_attribute (tree *, tree, tree, int, bool *); +static tree handle_section_attribute (tree *, tree, tree, int, bool *); +static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); +static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; +static tree handle_noplt_attribute (tree *, tree, tree, int, bool *) ; +static tree handle_alias_ifunc_attribute (bool, tree *, tree, tree, bool *); +static tree handle_ifunc_attribute (tree *, tree, tree, int, bool *); +static tree handle_alias_attribute (tree *, tree, tree, int, bool *); +static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; +static tree handle_visibility_attribute (tree *, tree, tree, int, + bool *); +static tree handle_tls_model_attribute (tree *, tree, tree, int, + bool *); +static tree handle_no_instrument_function_attribute (tree *, tree, + tree, int, bool *); +static tree handle_no_profile_instrument_function_attribute (tree *, tree, + tree, int, bool *); +static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); +static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); +static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, + bool *); +static tree handle_pure_attribute (tree *, tree, tree, int, bool *); +static tree handle_tm_attribute (tree *, tree, tree, int, bool *); +static tree handle_tm_wrap_attribute (tree *, tree, tree, int, bool *); +static tree handle_novops_attribute (tree *, tree, tree, int, bool *); +static tree handle_deprecated_attribute (tree *, tree, tree, int, + bool *); +static tree handle_vector_size_attribute (tree *, tree, tree, int, + bool *); +static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); +static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); +static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); +static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, + bool *); +static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); +static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); +static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *); +static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *); +static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *); +static tree handle_target_attribute (tree *, tree, tree, int, bool *); +static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *); +static tree handle_optimize_attribute (tree *, tree, tree, int, bool *); +static tree ignore_attribute (tree *, tree, tree, int, bool *); +static tree handle_no_split_stack_attribute (tree *, tree, tree, int, bool *); +static tree handle_fnspec_attribute (tree *, tree, tree, int, bool *); +static tree handle_warn_unused_attribute (tree *, tree, tree, int, bool *); +static tree handle_returns_nonnull_attribute (tree *, tree, tree, int, bool *); +static tree handle_omp_declare_simd_attribute (tree *, tree, tree, int, + bool *); +static tree handle_simd_attribute (tree *, tree, tree, int, bool *); +static tree handle_omp_declare_target_attribute (tree *, tree, tree, int, + bool *); +static tree handle_designated_init_attribute (tree *, tree, tree, int, bool *); +static tree handle_bnd_variable_size_attribute (tree *, tree, tree, int, bool *); +static tree handle_bnd_legacy (tree *, tree, tree, int, bool *); +static tree handle_bnd_instrument (tree *, tree, tree, int, bool *); +static tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *); + +/* Table of machine-independent attributes common to all C-like languages. + + All attributes referencing arguments should be additionally processed + in chkp_copy_function_type_adding_bounds for correct instrumentation + by Pointer Bounds Checker. + Current list of processed common attributes: nonnull. */ +const struct attribute_spec c_common_attribute_table[] = +{ + /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, + affects_type_identity } */ + { "packed", 0, 0, false, false, false, + handle_packed_attribute , false}, + { "nocommon", 0, 0, true, false, false, + handle_nocommon_attribute, false}, + { "common", 0, 0, true, false, false, + handle_common_attribute, false }, + /* FIXME: logically, noreturn attributes should be listed as + "false, true, true" and apply to function types. But implementing this + would require all the places in the compiler that use TREE_THIS_VOLATILE + on a decl to identify non-returning functions to be located and fixed + to check the function type instead. */ + { "noreturn", 0, 0, true, false, false, + handle_noreturn_attribute, false }, + { "volatile", 0, 0, true, false, false, + handle_noreturn_attribute, false }, + { "stack_protect", 0, 0, true, false, false, + handle_stack_protect_attribute, false }, + { "noinline", 0, 0, true, false, false, + handle_noinline_attribute, false }, + { "noclone", 0, 0, true, false, false, + handle_noclone_attribute, false }, + { "no_icf", 0, 0, true, false, false, + handle_noicf_attribute, false }, + { "leaf", 0, 0, true, false, false, + handle_leaf_attribute, false }, + { "always_inline", 0, 0, true, false, false, + handle_always_inline_attribute, false }, + { "gnu_inline", 0, 0, true, false, false, + handle_gnu_inline_attribute, false }, + { "artificial", 0, 0, true, false, false, + handle_artificial_attribute, false }, + { "flatten", 0, 0, true, false, false, + handle_flatten_attribute, false }, + { "used", 0, 0, true, false, false, + handle_used_attribute, false }, + { "unused", 0, 0, false, false, false, + handle_unused_attribute, false }, + { "externally_visible", 0, 0, true, false, false, + handle_externally_visible_attribute, false }, + { "no_reorder", 0, 0, true, false, false, + handle_no_reorder_attribute, false }, + /* The same comments as for noreturn attributes apply to const ones. */ + { "const", 0, 0, true, false, false, + handle_const_attribute, false }, + { "scalar_storage_order", 1, 1, false, false, false, + handle_scalar_storage_order_attribute, false }, + { "transparent_union", 0, 0, false, false, false, + handle_transparent_union_attribute, false }, + { "constructor", 0, 1, true, false, false, + handle_constructor_attribute, false }, + { "destructor", 0, 1, true, false, false, + handle_destructor_attribute, false }, + { "mode", 1, 1, false, true, false, + handle_mode_attribute, false }, + { "section", 1, 1, true, false, false, + handle_section_attribute, false }, + { "aligned", 0, 1, false, false, false, + handle_aligned_attribute, false }, + { "weak", 0, 0, true, false, false, + handle_weak_attribute, false }, + { "noplt", 0, 0, true, false, false, + handle_noplt_attribute, false }, + { "ifunc", 1, 1, true, false, false, + handle_ifunc_attribute, false }, + { "alias", 1, 1, true, false, false, + handle_alias_attribute, false }, + { "weakref", 0, 1, true, false, false, + handle_weakref_attribute, false }, + { "no_instrument_function", 0, 0, true, false, false, + handle_no_instrument_function_attribute, + false }, + { "no_profile_instrument_function", 0, 0, true, false, false, + handle_no_profile_instrument_function_attribute, + false }, + { "malloc", 0, 0, true, false, false, + handle_malloc_attribute, false }, + { "returns_twice", 0, 0, true, false, false, + handle_returns_twice_attribute, false }, + { "no_stack_limit", 0, 0, true, false, false, + handle_no_limit_stack_attribute, false }, + { "pure", 0, 0, true, false, false, + handle_pure_attribute, false }, + { "transaction_callable", 0, 0, false, true, false, + handle_tm_attribute, false }, + { "transaction_unsafe", 0, 0, false, true, false, + handle_tm_attribute, true }, + { "transaction_safe", 0, 0, false, true, false, + handle_tm_attribute, true }, + { "transaction_safe_dynamic", 0, 0, true, false, false, + handle_tm_attribute, false }, + { "transaction_may_cancel_outer", 0, 0, false, true, false, + handle_tm_attribute, false }, + /* ??? These two attributes didn't make the transition from the + Intel language document to the multi-vendor language document. */ + { "transaction_pure", 0, 0, false, true, false, + handle_tm_attribute, false }, + { "transaction_wrap", 1, 1, true, false, false, + handle_tm_wrap_attribute, false }, + /* For internal use (marking of builtins) only. The name contains space + to prevent its usage in source code. */ + { "no vops", 0, 0, true, false, false, + handle_novops_attribute, false }, + { "deprecated", 0, 1, false, false, false, + handle_deprecated_attribute, false }, + { "vector_size", 1, 1, false, true, false, + handle_vector_size_attribute, true }, + { "visibility", 1, 1, false, false, false, + handle_visibility_attribute, false }, + { "tls_model", 1, 1, true, false, false, + handle_tls_model_attribute, false }, + { "nonnull", 0, -1, false, true, true, + handle_nonnull_attribute, false }, + { "nothrow", 0, 0, true, false, false, + handle_nothrow_attribute, false }, + { "may_alias", 0, 0, false, true, false, NULL, false }, + { "cleanup", 1, 1, true, false, false, + handle_cleanup_attribute, false }, + { "warn_unused_result", 0, 0, false, true, true, + handle_warn_unused_result_attribute, false }, + { "sentinel", 0, 1, false, true, true, + handle_sentinel_attribute, false }, + /* For internal use (marking of builtins) only. The name contains space + to prevent its usage in source code. */ + { "type generic", 0, 0, false, true, true, + handle_type_generic_attribute, false }, + { "alloc_size", 1, 2, false, true, true, + handle_alloc_size_attribute, false }, + { "cold", 0, 0, true, false, false, + handle_cold_attribute, false }, + { "hot", 0, 0, true, false, false, + handle_hot_attribute, false }, + { "no_address_safety_analysis", + 0, 0, true, false, false, + handle_no_address_safety_analysis_attribute, + false }, + { "no_sanitize_address", 0, 0, true, false, false, + handle_no_sanitize_address_attribute, + false }, + { "no_sanitize_thread", 0, 0, true, false, false, + handle_no_sanitize_address_attribute, + false }, + { "no_sanitize_undefined", 0, 0, true, false, false, + handle_no_sanitize_undefined_attribute, + false }, + { "warning", 1, 1, true, false, false, + handle_error_attribute, false }, + { "error", 1, 1, true, false, false, + handle_error_attribute, false }, + { "target", 1, -1, true, false, false, + handle_target_attribute, false }, + { "target_clones", 1, -1, true, false, false, + handle_target_clones_attribute, false }, + { "optimize", 1, -1, true, false, false, + handle_optimize_attribute, false }, + /* For internal use only. The leading '*' both prevents its usage in + source code and signals that it may be overridden by machine tables. */ + { "*tm regparm", 0, 0, false, true, true, + ignore_attribute, false }, + { "no_split_stack", 0, 0, true, false, false, + handle_no_split_stack_attribute, false }, + /* For internal use (marking of builtins and runtime functions) only. + The name contains space to prevent its usage in source code. */ + { "fn spec", 1, 1, false, true, true, + handle_fnspec_attribute, false }, + { "warn_unused", 0, 0, false, false, false, + handle_warn_unused_attribute, false }, + { "returns_nonnull", 0, 0, false, true, true, + handle_returns_nonnull_attribute, false }, + { "omp declare simd", 0, -1, true, false, false, + handle_omp_declare_simd_attribute, false }, + { "cilk simd function", 0, -1, true, false, false, + handle_omp_declare_simd_attribute, false }, + { "simd", 0, 1, true, false, false, + handle_simd_attribute, false }, + { "omp declare target", 0, 0, true, false, false, + handle_omp_declare_target_attribute, false }, + { "omp declare target link", 0, 0, true, false, false, + handle_omp_declare_target_attribute, false }, + { "alloc_align", 1, 1, false, true, true, + handle_alloc_align_attribute, false }, + { "assume_aligned", 1, 2, false, true, true, + handle_assume_aligned_attribute, false }, + { "designated_init", 0, 0, false, true, false, + handle_designated_init_attribute, false }, + { "bnd_variable_size", 0, 0, true, false, false, + handle_bnd_variable_size_attribute, false }, + { "bnd_legacy", 0, 0, true, false, false, + handle_bnd_legacy, false }, + { "bnd_instrument", 0, 0, true, false, false, + handle_bnd_instrument, false }, + { "fallthrough", 0, 0, false, false, false, + handle_fallthrough_attribute, false }, + { NULL, 0, 0, false, false, false, NULL, false } +}; + +/* Give the specifications for the format attributes, used by C and all + descendants. + + All attributes referencing arguments should be additionally processed + in chkp_copy_function_type_adding_bounds for correct instrumentation + by Pointer Bounds Checker. + Current list of processed format attributes: format, format_arg. */ +const struct attribute_spec c_common_format_attribute_table[] = +{ + /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, + affects_type_identity } */ + { "format", 3, 3, false, true, true, + handle_format_attribute, false }, + { "format_arg", 1, 1, false, true, true, + handle_format_arg_attribute, false }, + { NULL, 0, 0, false, false, false, NULL, false } +}; + +/* Returns TRUE iff the attribute indicated by ATTR_ID takes a plain + identifier as an argument, so the front end shouldn't look it up. */ + +bool +attribute_takes_identifier_p (const_tree attr_id) +{ + const struct attribute_spec *spec = lookup_attribute_spec (attr_id); + if (spec == NULL) + /* Unknown attribute that we'll end up ignoring, return true so we + don't complain about an identifier argument. */ + return true; + else if (!strcmp ("mode", spec->name) + || !strcmp ("format", spec->name) + || !strcmp ("cleanup", spec->name)) + return true; + else + return targetm.attribute_takes_identifier_p (attr_id); +} + +/* Attribute handlers common to C front ends. */ + +/* Handle a "packed" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int flags, bool *no_add_attrs) +{ + if (TYPE_P (*node)) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *node = build_variant_type_copy (*node); + TYPE_PACKED (*node) = 1; + } + else if (TREE_CODE (*node) == FIELD_DECL) + { + if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT + /* Still pack bitfields. */ + && ! DECL_INITIAL (*node)) + warning (OPT_Wattributes, + "%qE attribute ignored for field of type %qT", + name, TREE_TYPE (*node)); + else + DECL_PACKED (*node) = 1; + } + /* We can't set DECL_PACKED for a VAR_DECL, because the bit is + used for DECL_REGISTER. It wouldn't mean anything anyway. + We can't set DECL_PACKED on the type of a TYPE_DECL, because + that changes what the typedef is typing. */ + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "nocommon" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_nocommon_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (VAR_P (*node)) + DECL_COMMON (*node) = 0; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "common" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (VAR_P (*node)) + DECL_COMMON (*node) = 1; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "noreturn" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree type = TREE_TYPE (*node); + + /* See FIXME comment in c_common_attribute_table. */ + if (TREE_CODE (*node) == FUNCTION_DECL + || objc_method_decl (TREE_CODE (*node))) + TREE_THIS_VOLATILE (*node) = 1; + else if (TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) + TREE_TYPE (*node) + = (build_qualified_type + (build_pointer_type + (build_type_variant (TREE_TYPE (type), + TYPE_READONLY (TREE_TYPE (type)), 1)), + TYPE_QUALS (type))); + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "hot" and attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL + || TREE_CODE (*node) == LABEL_DECL) + { + if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL) + { + warning (OPT_Wattributes, "%qE attribute ignored due to conflict " + "with attribute %qs", name, "cold"); + *no_add_attrs = true; + } + /* Most of the rest of the hot processing is done later with + lookup_attribute. */ + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "cold" and attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_cold_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL + || TREE_CODE (*node) == LABEL_DECL) + { + if (lookup_attribute ("hot", DECL_ATTRIBUTES (*node)) != NULL) + { + warning (OPT_Wattributes, "%qE attribute ignored due to conflict " + "with attribute %qs", name, "hot"); + *no_add_attrs = true; + } + /* Most of the rest of the cold processing is done later with + lookup_attribute. */ + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "no_sanitize_address" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_sanitize_address_attribute (tree *node, tree name, tree, int, + bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "no_address_safety_analysis" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_address_safety_analysis_attribute (tree *node, tree name, tree, int, + bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + warning (OPT_Wattributes, "%qE attribute ignored", name); + else if (!lookup_attribute ("no_sanitize_address", DECL_ATTRIBUTES (*node))) + DECL_ATTRIBUTES (*node) + = tree_cons (get_identifier ("no_sanitize_address"), + NULL_TREE, DECL_ATTRIBUTES (*node)); + *no_add_attrs = true; + return NULL_TREE; +} + +/* Handle a "no_sanitize_undefined" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_sanitize_undefined_attribute (tree *node, tree name, tree, int, + bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "stack_protect" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_stack_protect_attribute (tree *node, tree name, tree, int, + bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + else + DECL_ATTRIBUTES (*node) + = tree_cons (get_identifier ("stack_protect"), + NULL_TREE, DECL_ATTRIBUTES (*node)); + + return NULL_TREE; +} + +/* Handle a "noinline" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noinline_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + { + if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node))) + { + warning (OPT_Wattributes, "%qE attribute ignored due to conflict " + "with attribute %qs", name, "always_inline"); + *no_add_attrs = true; + } + else + DECL_UNINLINABLE (*node) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "noclone" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noclone_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "no_icf" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noicf_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + + +/* Handle a "always_inline" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_always_inline_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + { + if (lookup_attribute ("noinline", DECL_ATTRIBUTES (*node))) + { + warning (OPT_Wattributes, "%qE attribute ignored due to conflict " + "with %qs attribute", name, "noinline"); + *no_add_attrs = true; + } + else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node))) + { + warning (OPT_Wattributes, "%qE attribute ignored due to conflict " + "with %qs attribute", name, "target_clones"); + *no_add_attrs = true; + } + else + /* Set the attribute and mark it for disregarding inline + limits. */ + DECL_DISREGARD_INLINE_LIMITS (*node) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "gnu_inline" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_gnu_inline_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) + { + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "leaf" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_leaf_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + if (!TREE_PUBLIC (*node)) + { + warning (OPT_Wattributes, "%qE attribute has no effect on unit local " + "functions", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle an "artificial" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_artificial_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) + { + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "flatten" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_flatten_attribute (tree *node, tree name, + tree args ATTRIBUTE_UNUSED, + int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + ; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "warning" or "error" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_error_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL + && TREE_CODE (TREE_VALUE (args)) == STRING_CST) + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + ; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "used" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree node = *pnode; + + if (TREE_CODE (node) == FUNCTION_DECL + || (VAR_P (node) && TREE_STATIC (node)) + || (TREE_CODE (node) == TYPE_DECL)) + { + TREE_USED (node) = 1; + DECL_PRESERVE_P (node) = 1; + if (VAR_P (node)) + DECL_READ_P (node) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "unused" attribute; arguments as in + struct attribute_spec.handler. */ + +tree +handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int flags, bool *no_add_attrs) +{ + if (DECL_P (*node)) + { + tree decl = *node; + + if (TREE_CODE (decl) == PARM_DECL + || VAR_OR_FUNCTION_DECL_P (decl) + || TREE_CODE (decl) == LABEL_DECL + || TREE_CODE (decl) == CONST_DECL + || TREE_CODE (decl) == TYPE_DECL) + { + TREE_USED (decl) = 1; + if (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL) + DECL_READ_P (decl) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + } + else + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *node = build_variant_type_copy (*node); + TREE_USED (*node) = 1; + } + + return NULL_TREE; +} + +/* Handle a "externally_visible" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_externally_visible_attribute (tree *pnode, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + tree node = *pnode; + + if (VAR_OR_FUNCTION_DECL_P (node)) + { + if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL + && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node)) + { + warning (OPT_Wattributes, + "%qE attribute have effect only on public objects", name); + *no_add_attrs = true; + } + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle the "no_reorder" attribute. Arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_reorder_attribute (tree *pnode, + tree name, + tree, + int, + bool *no_add_attrs) +{ + tree node = *pnode; + + if (!VAR_OR_FUNCTION_DECL_P (node) + && !(TREE_STATIC (node) || DECL_EXTERNAL (node))) + { + warning (OPT_Wattributes, + "%qE attribute only affects top level objects", + name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "const" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree type = TREE_TYPE (*node); + + /* See FIXME comment on noreturn in c_common_attribute_table. */ + if (TREE_CODE (*node) == FUNCTION_DECL) + TREE_READONLY (*node) = 1; + else if (TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) + TREE_TYPE (*node) + = (build_qualified_type + (build_pointer_type + (build_type_variant (TREE_TYPE (type), 1, + TREE_THIS_VOLATILE (TREE_TYPE (type)))), + TYPE_QUALS (type))); + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "scalar_storage_order" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_scalar_storage_order_attribute (tree *node, tree name, tree args, + int flags, bool *no_add_attrs) +{ + tree id = TREE_VALUE (args); + tree type; + + if (TREE_CODE (*node) == TYPE_DECL + && ! (flags & ATTR_FLAG_CXX11)) + node = &TREE_TYPE (*node); + type = *node; + + if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN) + { + error ("scalar_storage_order is not supported because endianness " + "is not uniform"); + return NULL_TREE; + } + + if (RECORD_OR_UNION_TYPE_P (type) && !c_dialect_cxx ()) + { + bool reverse = false; + + if (TREE_CODE (id) == STRING_CST + && strcmp (TREE_STRING_POINTER (id), "big-endian") == 0) + reverse = !BYTES_BIG_ENDIAN; + else if (TREE_CODE (id) == STRING_CST + && strcmp (TREE_STRING_POINTER (id), "little-endian") == 0) + reverse = BYTES_BIG_ENDIAN; + else + { + error ("scalar_storage_order argument must be one of \"big-endian\"" + " or \"little-endian\""); + return NULL_TREE; + } + + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + { + if (reverse) + /* A type variant isn't good enough, since we don't want a cast + to such a type to be removed as a no-op. */ + *node = type = build_duplicate_type (type); + } + + TYPE_REVERSE_STORAGE_ORDER (type) = reverse; + return NULL_TREE; + } + + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + return NULL_TREE; +} + +/* Handle a "transparent_union" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_transparent_union_attribute (tree *node, tree name, + tree ARG_UNUSED (args), int flags, + bool *no_add_attrs) +{ + tree type; + + *no_add_attrs = true; + + if (TREE_CODE (*node) == TYPE_DECL + && ! (flags & ATTR_FLAG_CXX11)) + node = &TREE_TYPE (*node); + type = *node; + + if (TREE_CODE (type) == UNION_TYPE) + { + /* Make sure that the first field will work for a transparent union. + If the type isn't complete yet, leave the check to the code in + finish_struct. */ + if (TYPE_SIZE (type)) + { + tree first = first_field (type); + if (first == NULL_TREE + || DECL_ARTIFICIAL (first) + || TYPE_MODE (type) != DECL_MODE (first)) + goto ignored; + } + + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + { + /* If the type isn't complete yet, setting the flag + on a variant wouldn't ever be checked. */ + if (!TYPE_SIZE (type)) + goto ignored; + + /* build_duplicate_type doesn't work for C++. */ + if (c_dialect_cxx ()) + goto ignored; + + /* A type variant isn't good enough, since we don't want a cast + to such a type to be removed as a no-op. */ + *node = type = build_duplicate_type (type); + } + + for (tree t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) + TYPE_TRANSPARENT_AGGR (t) = 1; + return NULL_TREE; + } + + ignored: + warning (OPT_Wattributes, "%qE attribute ignored", name); + return NULL_TREE; +} + +/* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to + get the requested priority for a constructor or destructor, + possibly issuing diagnostics for invalid or reserved + priorities. */ + +static priority_type +get_priority (tree args, bool is_destructor) +{ + HOST_WIDE_INT pri; + tree arg; + + if (!args) + return DEFAULT_INIT_PRIORITY; + + if (!SUPPORTS_INIT_PRIORITY) + { + if (is_destructor) + error ("destructor priorities are not supported"); + else + error ("constructor priorities are not supported"); + return DEFAULT_INIT_PRIORITY; + } + + arg = TREE_VALUE (args); + if (TREE_CODE (arg) == IDENTIFIER_NODE) + goto invalid; + if (arg == error_mark_node) + return DEFAULT_INIT_PRIORITY; + arg = default_conversion (arg); + if (!tree_fits_shwi_p (arg) + || !INTEGRAL_TYPE_P (TREE_TYPE (arg))) + goto invalid; + + pri = tree_to_shwi (arg); + if (pri < 0 || pri > MAX_INIT_PRIORITY) + goto invalid; + + if (pri <= MAX_RESERVED_INIT_PRIORITY) + { + if (is_destructor) + warning (0, + "destructor priorities from 0 to %d are reserved " + "for the implementation", + MAX_RESERVED_INIT_PRIORITY); + else + warning (0, + "constructor priorities from 0 to %d are reserved " + "for the implementation", + MAX_RESERVED_INIT_PRIORITY); + } + return pri; + + invalid: + if (is_destructor) + error ("destructor priorities must be integers from 0 to %d inclusive", + MAX_INIT_PRIORITY); + else + error ("constructor priorities must be integers from 0 to %d inclusive", + MAX_INIT_PRIORITY); + return DEFAULT_INIT_PRIORITY; +} + +/* Handle a "constructor" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_constructor_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + tree decl = *node; + tree type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (type) == FUNCTION_TYPE + && decl_function_context (decl) == 0) + { + priority_type priority; + DECL_STATIC_CONSTRUCTOR (decl) = 1; + priority = get_priority (args, /*is_destructor=*/false); + SET_DECL_INIT_PRIORITY (decl, priority); + TREE_USED (decl) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "destructor" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_destructor_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + tree decl = *node; + tree type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (type) == FUNCTION_TYPE + && decl_function_context (decl) == 0) + { + priority_type priority; + DECL_STATIC_DESTRUCTOR (decl) = 1; + priority = get_priority (args, /*is_destructor=*/true); + SET_DECL_FINI_PRIORITY (decl, priority); + TREE_USED (decl) = 1; + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Nonzero if the mode is a valid vector mode for this architecture. + This returns nonzero even if there is no hardware support for the + vector mode, but we can emulate with narrower modes. */ + +static bool +vector_mode_valid_p (machine_mode mode) +{ + enum mode_class mclass = GET_MODE_CLASS (mode); + machine_mode innermode; + + /* Doh! What's going on? */ + if (mclass != MODE_VECTOR_INT + && mclass != MODE_VECTOR_FLOAT + && mclass != MODE_VECTOR_FRACT + && mclass != MODE_VECTOR_UFRACT + && mclass != MODE_VECTOR_ACCUM + && mclass != MODE_VECTOR_UACCUM) + return false; + + /* Hardware support. Woo hoo! */ + if (targetm.vector_mode_supported_p (mode)) + return true; + + innermode = GET_MODE_INNER (mode); + + /* We should probably return 1 if requesting V4DI and we have no DI, + but we have V2DI, but this is probably very unlikely. */ + + /* If we have support for the inner mode, we can safely emulate it. + We may not have V2DI, but me can emulate with a pair of DIs. */ + return targetm.scalar_mode_supported_p (innermode); +} + + +/* Handle a "mode" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_mode_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree type = *node; + tree ident = TREE_VALUE (args); + + *no_add_attrs = true; + + if (TREE_CODE (ident) != IDENTIFIER_NODE) + warning (OPT_Wattributes, "%qE attribute ignored", name); + else + { + int j; + const char *p = IDENTIFIER_POINTER (ident); + int len = strlen (p); + machine_mode mode = VOIDmode; + tree typefm; + bool valid_mode; + + if (len > 4 && p[0] == '_' && p[1] == '_' + && p[len - 1] == '_' && p[len - 2] == '_') + { + char *newp = (char *) alloca (len - 1); + + strcpy (newp, &p[2]); + newp[len - 4] = '\0'; + p = newp; + } + + /* Change this type to have a type with the specified mode. + First check for the special modes. */ + if (!strcmp (p, "byte")) + mode = byte_mode; + else if (!strcmp (p, "word")) + mode = word_mode; + else if (!strcmp (p, "pointer")) + mode = ptr_mode; + else if (!strcmp (p, "libgcc_cmp_return")) + mode = targetm.libgcc_cmp_return_mode (); + else if (!strcmp (p, "libgcc_shift_count")) + mode = targetm.libgcc_shift_count_mode (); + else if (!strcmp (p, "unwind_word")) + mode = targetm.unwind_word_mode (); + else + for (j = 0; j < NUM_MACHINE_MODES; j++) + if (!strcmp (p, GET_MODE_NAME (j))) + { + mode = (machine_mode) j; + break; + } + + if (mode == VOIDmode) + { + error ("unknown machine mode %qE", ident); + return NULL_TREE; + } + + valid_mode = false; + switch (GET_MODE_CLASS (mode)) + { + case MODE_INT: + case MODE_PARTIAL_INT: + case MODE_FLOAT: + case MODE_DECIMAL_FLOAT: + case MODE_FRACT: + case MODE_UFRACT: + case MODE_ACCUM: + case MODE_UACCUM: + valid_mode = targetm.scalar_mode_supported_p (mode); + break; + + case MODE_COMPLEX_INT: + case MODE_COMPLEX_FLOAT: + valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); + break; + + case MODE_VECTOR_INT: + case MODE_VECTOR_FLOAT: + case MODE_VECTOR_FRACT: + case MODE_VECTOR_UFRACT: + case MODE_VECTOR_ACCUM: + case MODE_VECTOR_UACCUM: + warning (OPT_Wattributes, "specifying vector types with " + "__attribute__ ((mode)) is deprecated"); + warning (OPT_Wattributes, + "use __attribute__ ((vector_size)) instead"); + valid_mode = vector_mode_valid_p (mode); + break; + + default: + break; + } + if (!valid_mode) + { + error ("unable to emulate %qs", p); + return NULL_TREE; + } + + if (POINTER_TYPE_P (type)) + { + addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type)); + tree (*fn)(tree, machine_mode, bool); + + if (!targetm.addr_space.valid_pointer_mode (mode, as)) + { + error ("invalid pointer mode %qs", p); + return NULL_TREE; + } + + if (TREE_CODE (type) == POINTER_TYPE) + fn = build_pointer_type_for_mode; + else + fn = build_reference_type_for_mode; + typefm = fn (TREE_TYPE (type), mode, false); + } + else + { + /* For fixed-point modes, we need to test if the signness of type + and the machine mode are consistent. */ + if (ALL_FIXED_POINT_MODE_P (mode) + && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode)) + { + error ("signedness of type and machine mode %qs don%'t match", p); + return NULL_TREE; + } + /* For fixed-point modes, we need to pass saturating info. */ + typefm = lang_hooks.types.type_for_mode (mode, + ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type) + : TYPE_UNSIGNED (type)); + } + + if (typefm == NULL_TREE) + { + error ("no data type for mode %qs", p); + return NULL_TREE; + } + else if (TREE_CODE (type) == ENUMERAL_TYPE) + { + /* For enumeral types, copy the precision from the integer + type returned above. If not an INTEGER_TYPE, we can't use + this mode for this type. */ + if (TREE_CODE (typefm) != INTEGER_TYPE) + { + error ("cannot use mode %qs for enumeral types", p); + return NULL_TREE; + } + + if (flags & ATTR_FLAG_TYPE_IN_PLACE) + { + TYPE_PRECISION (type) = TYPE_PRECISION (typefm); + typefm = type; + } + else + { + /* We cannot build a type variant, as there's code that assumes + that TYPE_MAIN_VARIANT has the same mode. This includes the + debug generators. Instead, create a subrange type. This + results in all of the enumeral values being emitted only once + in the original, and the subtype gets them by reference. */ + if (TYPE_UNSIGNED (type)) + typefm = make_unsigned_type (TYPE_PRECISION (typefm)); + else + typefm = make_signed_type (TYPE_PRECISION (typefm)); + TREE_TYPE (typefm) = type; + } + } + else if (VECTOR_MODE_P (mode) + ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) + : TREE_CODE (type) != TREE_CODE (typefm)) + { + error ("mode %qs applied to inappropriate type", p); + return NULL_TREE; + } + + *node = typefm; + } + + 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; + } + + user_defined_section_attribute = true; + + if (!VAR_OR_FUNCTION_DECL_P (decl)) + { + error ("section attribute not allowed for %q+D", *node); + goto fail; + } + + if (TREE_CODE (TREE_VALUE (args)) != STRING_CST) + { + error ("section attribute argument not a string constant"); + goto fail; + } + + if (VAR_P (decl) + && current_function_decl != NULL_TREE + && !TREE_STATIC (decl)) + { + error_at (DECL_SOURCE_LOCATION (decl), + "section attribute cannot be specified for local variables"); + goto fail; + } + + /* The decl may have already been given a section attribute + from a previous declaration. Ensure they match. */ + if (DECL_SECTION_NAME (decl) != NULL + && strcmp (DECL_SECTION_NAME (decl), + TREE_STRING_POINTER (TREE_VALUE (args))) != 0) + { + error ("section of %q+D conflicts with previous declaration", *node); + goto fail; + } + + if (VAR_P (decl) + && !targetm.have_tls && targetm.emutls.tmpl_section + && DECL_THREAD_LOCAL_P (decl)) + { + error ("section of %q+D cannot be overridden", *node); + goto fail; + } + + set_decl_section_name (decl, TREE_STRING_POINTER (TREE_VALUE (args))); + return NULL_TREE; + +fail: + *no_add_attrs = true; + return NULL_TREE; +} + +/* If in c++-11, check if the c++-11 alignment constraint with respect + to fundamental alignment (in [dcl.align]) are satisfied. If not in + c++-11 mode, does nothing. + + [dcl.align]2/ says: + + [* if the constant expression evaluates to a fundamental alignment, + the alignment requirement of the declared entity shall be the + specified fundamental alignment. + + * if the constant expression evaluates to an extended alignment + and the implementation supports that alignment in the context + of the declaration, the alignment of the declared entity shall + be that alignment + + * if the constant expression evaluates to an extended alignment + and the implementation does not support that alignment in the + context of the declaration, the program is ill-formed]. */ + +static bool +check_cxx_fundamental_alignment_constraints (tree node, + unsigned align_log, + int flags) +{ + bool alignment_too_large_p = false; + unsigned requested_alignment = (1U << align_log) * BITS_PER_UNIT; + unsigned max_align = 0; + + if ((!(flags & ATTR_FLAG_CXX11) && !warn_cxx_compat) + || (node == NULL_TREE || node == error_mark_node)) + return true; + + if (cxx_fundamental_alignment_p (requested_alignment)) + return true; + + if (VAR_P (node)) + { + if (TREE_STATIC (node) || DECL_EXTERNAL (node)) + /* For file scope variables and static members, the target supports + alignments that are at most MAX_OFILE_ALIGNMENT. */ + max_align = MAX_OFILE_ALIGNMENT; + else + /* For stack variables, the target supports at most + MAX_STACK_ALIGNMENT. */ + max_align = MAX_STACK_ALIGNMENT; + if (requested_alignment > max_align) + alignment_too_large_p = true; + } + /* Let's be liberal for types and fields; don't limit their alignment any + more than check_user_alignment already did. */ + + if (alignment_too_large_p) + pedwarn (input_location, OPT_Wattributes, + "requested alignment %d is larger than %d", + requested_alignment / BITS_PER_UNIT, max_align / BITS_PER_UNIT); + + return !alignment_too_large_p; +} + +/* Handle a "aligned" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, + int flags, bool *no_add_attrs) +{ + tree decl = NULL_TREE; + tree *type = NULL; + int is_type = 0; + tree align_expr; + int i; + + if (args) + { + align_expr = TREE_VALUE (args); + if (align_expr && TREE_CODE (align_expr) != IDENTIFIER_NODE + && TREE_CODE (align_expr) != FUNCTION_DECL) + align_expr = default_conversion (align_expr); + } + else + align_expr = size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT); + + if (DECL_P (*node)) + { + decl = *node; + type = &TREE_TYPE (decl); + is_type = TREE_CODE (*node) == TYPE_DECL; + } + else if (TYPE_P (*node)) + type = node, is_type = 1; + + if ((i = check_user_alignment (align_expr, true)) == -1 + || !check_cxx_fundamental_alignment_constraints (*node, i, flags)) + *no_add_attrs = true; + else if (is_type) + { + if ((flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + /* OK, modify the type in place. */; + /* If we have a TYPE_DECL, then copy the type, so that we + don't accidentally modify a builtin type. See pushdecl. */ + else if (decl && TREE_TYPE (decl) != error_mark_node + && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) + { + tree tt = TREE_TYPE (decl); + *type = build_variant_type_copy (*type); + DECL_ORIGINAL_TYPE (decl) = tt; + TYPE_NAME (*type) = decl; + TREE_USED (*type) = TREE_USED (decl); + TREE_TYPE (decl) = *type; + } + else + *type = build_variant_type_copy (*type); + + SET_TYPE_ALIGN (*type, (1U << i) * BITS_PER_UNIT); + TYPE_USER_ALIGN (*type) = 1; + } + else if (! VAR_OR_FUNCTION_DECL_P (decl) + && TREE_CODE (decl) != FIELD_DECL) + { + error ("alignment may not be specified for %q+D", decl); + *no_add_attrs = true; + } + else if (DECL_USER_ALIGN (decl) + && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) + /* C++-11 [dcl.align/4]: + + When multiple alignment-specifiers are specified for an + entity, the alignment requirement shall be set to the + strictest specified alignment. + + This formally comes from the c++11 specification but we are + doing it for the GNU attribute syntax as well. */ + *no_add_attrs = true; + else if (TREE_CODE (decl) == FUNCTION_DECL + && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) + { + if (DECL_USER_ALIGN (decl)) + error ("alignment for %q+D was previously specified as %d " + "and may not be decreased", decl, + DECL_ALIGN (decl) / BITS_PER_UNIT); + else + error ("alignment for %q+D must be at least %d", decl, + DECL_ALIGN (decl) / BITS_PER_UNIT); + *no_add_attrs = true; + } + else + { + SET_DECL_ALIGN (decl, (1U << i) * BITS_PER_UNIT); + DECL_USER_ALIGN (decl) = 1; + } + + return NULL_TREE; +} + +/* Handle a "weak" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_weak_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool * ARG_UNUSED (no_add_attrs)) +{ + if (TREE_CODE (*node) == FUNCTION_DECL + && DECL_DECLARED_INLINE_P (*node)) + { + warning (OPT_Wattributes, "inline function %q+D declared weak", *node); + *no_add_attrs = true; + } + else if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) + { + error ("indirect function %q+D cannot be declared weak", *node); + *no_add_attrs = true; + return NULL_TREE; + } + else if (VAR_OR_FUNCTION_DECL_P (*node)) + declare_weak (*node); + else + warning (OPT_Wattributes, "%qE attribute ignored", name); + + return NULL_TREE; +} + +/* Handle a "noplt" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noplt_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool * ARG_UNUSED (no_add_attrs)) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, + "%qE attribute is only applicable on functions", name); + *no_add_attrs = true; + return NULL_TREE; + } + return NULL_TREE; +} + +/* Handle an "alias" or "ifunc" attribute; arguments as in + struct attribute_spec.handler, except that IS_ALIAS tells us + whether this is an alias as opposed to ifunc attribute. */ + +static tree +handle_alias_ifunc_attribute (bool is_alias, tree *node, tree name, tree args, + bool *no_add_attrs) +{ + tree decl = *node; + + if (TREE_CODE (decl) != FUNCTION_DECL + && (!is_alias || !VAR_P (decl))) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) + || (TREE_CODE (decl) != FUNCTION_DECL + && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) + /* A static variable declaration is always a tentative definition, + but the alias is a non-tentative definition which overrides. */ + || (TREE_CODE (decl) != FUNCTION_DECL + && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl))) + { + error ("%q+D defined both normally and as %qE attribute", decl, name); + *no_add_attrs = true; + return NULL_TREE; + } + else if (!is_alias + && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl)) + || lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))) + { + error ("weak %q+D cannot be defined %qE", decl, name); + *no_add_attrs = true; + return NULL_TREE; + } + + /* Note that the very first time we process a nested declaration, + decl_function_context will not be set. Indeed, *would* never + be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that + we do below. After such frobbery, pushdecl would set the context. + In any case, this is never what we want. */ + else if (decl_function_context (decl) == 0 && current_function_decl == NULL) + { + tree id; + + id = TREE_VALUE (args); + if (TREE_CODE (id) != STRING_CST) + { + error ("attribute %qE argument not a string", name); + *no_add_attrs = true; + return NULL_TREE; + } + id = get_identifier (TREE_STRING_POINTER (id)); + /* This counts as a use of the object pointed to. */ + TREE_USED (id) = 1; + + if (TREE_CODE (decl) == FUNCTION_DECL) + DECL_INITIAL (decl) = error_mark_node; + else + TREE_STATIC (decl) = 1; + + if (!is_alias) + /* ifuncs are also aliases, so set that attribute too. */ + DECL_ATTRIBUTES (decl) + = tree_cons (get_identifier ("alias"), args, DECL_ATTRIBUTES (decl)); + } + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + if (decl_in_symtab_p (*node)) + { + struct symtab_node *n = symtab_node::get (decl); + if (n && n->refuse_visibility_changes) + { + if (is_alias) + error ("%+D declared alias after being used", decl); + else + error ("%+D declared ifunc after being used", decl); + } + } + + + return NULL_TREE; +} + +/* Handle an "alias" or "ifunc" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_ifunc_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + return handle_alias_ifunc_attribute (false, node, name, args, no_add_attrs); +} + +/* Handle an "alias" or "ifunc" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_alias_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + return handle_alias_ifunc_attribute (true, node, name, args, no_add_attrs); +} + +/* Handle a "weakref" attribute; arguments as in struct + attribute_spec.handler. */ + +static tree +handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, + int flags, bool *no_add_attrs) +{ + tree attr = NULL_TREE; + + /* We must ignore the attribute when it is associated with + local-scoped decls, since attribute alias is ignored and many + such symbols do not even have a DECL_WEAK field. */ + if (decl_function_context (*node) + || current_function_decl + || !VAR_OR_FUNCTION_DECL_P (*node)) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + return NULL_TREE; + } + + if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) + { + error ("indirect function %q+D cannot be declared weakref", *node); + *no_add_attrs = true; + return NULL_TREE; + } + + /* The idea here is that `weakref("name")' mutates into `weakref, + alias("name")', and weakref without arguments, in turn, + implicitly adds weak. */ + + if (args) + { + attr = tree_cons (get_identifier ("alias"), args, attr); + attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); + + *no_add_attrs = true; + + decl_attributes (node, attr, flags); + } + else + { + if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) + error_at (DECL_SOURCE_LOCATION (*node), + "weakref attribute must appear before alias attribute"); + + /* Can't call declare_weak because it wants this to be TREE_PUBLIC, + and that isn't supported; and because it wants to add it to + the list of weak decls, which isn't helpful. */ + DECL_WEAK (*node) = 1; + } + + if (decl_in_symtab_p (*node)) + { + struct symtab_node *n = symtab_node::get (*node); + if (n && n->refuse_visibility_changes) + error ("%+D declared weakref after being used", *node); + } + + return NULL_TREE; +} + +/* Handle an "visibility" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_visibility_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), + bool *ARG_UNUSED (no_add_attrs)) +{ + tree decl = *node; + tree id = TREE_VALUE (args); + enum symbol_visibility vis; + + if (TYPE_P (*node)) + { + if (TREE_CODE (*node) == ENUMERAL_TYPE) + /* OK */; + else if (!RECORD_OR_UNION_TYPE_P (*node)) + { + warning (OPT_Wattributes, "%qE attribute ignored on non-class types", + name); + return NULL_TREE; + } + else if (TYPE_FIELDS (*node)) + { + error ("%qE attribute ignored because %qT is already defined", + name, *node); + return NULL_TREE; + } + } + else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + return NULL_TREE; + } + + if (TREE_CODE (id) != STRING_CST) + { + error ("visibility argument not a string"); + return NULL_TREE; + } + + /* If this is a type, set the visibility on the type decl. */ + if (TYPE_P (decl)) + { + decl = TYPE_NAME (decl); + if (!decl) + return NULL_TREE; + if (TREE_CODE (decl) == IDENTIFIER_NODE) + { + warning (OPT_Wattributes, "%qE attribute ignored on types", + name); + return NULL_TREE; + } + } + + if (strcmp (TREE_STRING_POINTER (id), "default") == 0) + vis = VISIBILITY_DEFAULT; + else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) + vis = VISIBILITY_INTERNAL; + else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) + vis = VISIBILITY_HIDDEN; + else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) + vis = VISIBILITY_PROTECTED; + else + { + error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); + vis = VISIBILITY_DEFAULT; + } + + if (DECL_VISIBILITY_SPECIFIED (decl) + && vis != DECL_VISIBILITY (decl)) + { + tree attributes = (TYPE_P (*node) + ? TYPE_ATTRIBUTES (*node) + : DECL_ATTRIBUTES (decl)); + if (lookup_attribute ("visibility", attributes)) + error ("%qD redeclared with different visibility", decl); + else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES + && lookup_attribute ("dllimport", attributes)) + error ("%qD was declared %qs which implies default visibility", + decl, "dllimport"); + else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES + && lookup_attribute ("dllexport", attributes)) + error ("%qD was declared %qs which implies default visibility", + decl, "dllexport"); + } + + DECL_VISIBILITY (decl) = vis; + DECL_VISIBILITY_SPECIFIED (decl) = 1; + + /* Go ahead and attach the attribute to the node as well. This is needed + so we can determine whether we have VISIBILITY_DEFAULT because the + visibility was not specified, or because it was explicitly overridden + from the containing scope. */ + + return NULL_TREE; +} + +/* Handle an "tls_model" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_tls_model_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree id; + tree decl = *node; + enum tls_model kind; + + *no_add_attrs = true; + + if (!VAR_P (decl) || !DECL_THREAD_LOCAL_P (decl)) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + return NULL_TREE; + } + + kind = DECL_TLS_MODEL (decl); + id = TREE_VALUE (args); + if (TREE_CODE (id) != STRING_CST) + { + error ("tls_model argument not a string"); + return NULL_TREE; + } + + if (!strcmp (TREE_STRING_POINTER (id), "local-exec")) + kind = TLS_MODEL_LOCAL_EXEC; + else if (!strcmp (TREE_STRING_POINTER (id), "initial-exec")) + kind = TLS_MODEL_INITIAL_EXEC; + else if (!strcmp (TREE_STRING_POINTER (id), "local-dynamic")) + kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC; + else if (!strcmp (TREE_STRING_POINTER (id), "global-dynamic")) + kind = TLS_MODEL_GLOBAL_DYNAMIC; + else + error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\""); + + set_decl_tls_model (decl, kind); + return NULL_TREE; +} + +/* Handle a "no_instrument_function" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_instrument_function_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + tree decl = *node; + + if (TREE_CODE (decl) != FUNCTION_DECL) + { + error_at (DECL_SOURCE_LOCATION (decl), + "%qE attribute applies only to functions", name); + *no_add_attrs = true; + } + else + DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; + + return NULL_TREE; +} + +/* Handle a "no_profile_instrument_function" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_profile_instrument_function_attribute (tree *node, tree name, tree, + int, bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "malloc" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL + && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) + DECL_IS_MALLOC (*node) = 1; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "alloc_size" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + unsigned arg_count = type_num_arguments (*node); + for (; args; args = TREE_CHAIN (args)) + { + tree position = TREE_VALUE (args); + if (position && TREE_CODE (position) != IDENTIFIER_NODE + && TREE_CODE (position) != FUNCTION_DECL) + position = default_conversion (position); + + if (!tree_fits_uhwi_p (position) + || !arg_count + || !IN_RANGE (tree_to_uhwi (position), 1, arg_count)) + { + warning (OPT_Wattributes, + "alloc_size parameter outside range"); + *no_add_attrs = true; + return NULL_TREE; + } + } + return NULL_TREE; +} + +/* Handle a "alloc_align" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_alloc_align_attribute (tree *node, tree, tree args, int, + bool *no_add_attrs) +{ + unsigned arg_count = type_num_arguments (*node); + tree position = TREE_VALUE (args); + if (position && TREE_CODE (position) != IDENTIFIER_NODE + && TREE_CODE (position) != FUNCTION_DECL) + position = default_conversion (position); + + if (!tree_fits_uhwi_p (position) + || !arg_count + || !IN_RANGE (tree_to_uhwi (position), 1, arg_count)) + { + warning (OPT_Wattributes, + "alloc_align parameter outside range"); + *no_add_attrs = true; + return NULL_TREE; + } + return NULL_TREE; +} + +/* Handle a "assume_aligned" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_assume_aligned_attribute (tree *, tree, tree args, int, + bool *no_add_attrs) +{ + for (; args; args = TREE_CHAIN (args)) + { + tree position = TREE_VALUE (args); + if (position && TREE_CODE (position) != IDENTIFIER_NODE + && TREE_CODE (position) != FUNCTION_DECL) + position = default_conversion (position); + + if (TREE_CODE (position) != INTEGER_CST) + { + warning (OPT_Wattributes, + "assume_aligned parameter not integer constant"); + *no_add_attrs = true; + return NULL_TREE; + } + } + return NULL_TREE; +} + +/* Handle a "fn spec" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_fnspec_attribute (tree *node ATTRIBUTE_UNUSED, tree ARG_UNUSED (name), + tree args, int ARG_UNUSED (flags), + bool *no_add_attrs ATTRIBUTE_UNUSED) +{ + gcc_assert (args + && TREE_CODE (TREE_VALUE (args)) == STRING_CST + && !TREE_CHAIN (args)); + return NULL_TREE; +} + +/* Handle a "bnd_variable_size" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_bnd_variable_size_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FIELD_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "bnd_legacy" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_bnd_legacy (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "bnd_instrument" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_bnd_instrument (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "warn_unused" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_warn_unused_attribute (tree *node, tree name, + tree args ATTRIBUTE_UNUSED, + int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) +{ + if (TYPE_P (*node)) + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + ; + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle an "omp declare simd" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_omp_declare_simd_attribute (tree *, tree, tree, int, bool *) +{ + return NULL_TREE; +} + +/* Handle a "simd" attribute. */ + +static tree +handle_simd_attribute (tree *node, tree name, tree args, int, bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + { + if (lookup_attribute ("cilk simd function", + DECL_ATTRIBUTES (*node)) != NULL) + { + error_at (DECL_SOURCE_LOCATION (*node), + "%<__simd__%> attribute cannot be used in the same " + "function marked as a Cilk Plus SIMD-enabled function"); + *no_add_attrs = true; + } + else + { + tree t = get_identifier ("omp declare simd"); + tree attr = NULL_TREE; + if (args) + { + tree id = TREE_VALUE (args); + + if (TREE_CODE (id) != STRING_CST) + { + error ("attribute %qE argument not a string", name); + *no_add_attrs = true; + return NULL_TREE; + } + + if (strcmp (TREE_STRING_POINTER (id), "notinbranch") == 0) + attr = build_omp_clause (DECL_SOURCE_LOCATION (*node), + OMP_CLAUSE_NOTINBRANCH); + else + if (strcmp (TREE_STRING_POINTER (id), "inbranch") == 0) + attr = build_omp_clause (DECL_SOURCE_LOCATION (*node), + OMP_CLAUSE_INBRANCH); + else + { + error ("only % and % 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), + "% 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) + arg = default_conversion (arg); + + if (!get_nonnull_operand (arg, &arg_num)) + { + error ("nonnull argument has invalid operand number (argument %lu)", + (unsigned long) attr_arg_num); + *no_add_attrs = true; + return NULL_TREE; + } + + if (prototype_p (type)) + { + function_args_iterator iter; + tree argument; + + function_args_iter_init (&iter, type); + for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter)) + { + argument = function_args_iter_cond (&iter); + if (argument == NULL_TREE || ck_num == arg_num) + break; + } + + if (!argument + || TREE_CODE (argument) == VOID_TYPE) + { + error ("nonnull argument with out-of-range operand number " + "(argument %lu, operand %lu)", + (unsigned long) attr_arg_num, (unsigned long) arg_num); + *no_add_attrs = true; + return NULL_TREE; + } + + if (TREE_CODE (argument) != POINTER_TYPE) + { + error ("nonnull argument references non-pointer operand " + "(argument %lu, operand %lu)", + (unsigned long) attr_arg_num, (unsigned long) arg_num); + *no_add_attrs = true; + return NULL_TREE; + } + } + } + + return NULL_TREE; +} + +/* Handle a "nothrow" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_nothrow_attribute (tree *node, tree name, tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + TREE_NOTHROW (*node) = 1; + /* ??? TODO: Support types. */ + else + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "cleanup" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_cleanup_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + tree decl = *node; + tree cleanup_id, cleanup_decl; + + /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do + for global destructors in C++. This requires infrastructure that + we don't have generically at the moment. It's also not a feature + we'd be missing too much, since we do have attribute constructor. */ + if (!VAR_P (decl) || TREE_STATIC (decl)) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + return NULL_TREE; + } + + /* Verify that the argument is a function in scope. */ + /* ??? We could support pointers to functions here as well, if + that was considered desirable. */ + cleanup_id = TREE_VALUE (args); + if (TREE_CODE (cleanup_id) != IDENTIFIER_NODE) + { + error ("cleanup argument not an identifier"); + *no_add_attrs = true; + return NULL_TREE; + } + cleanup_decl = lookup_name (cleanup_id); + if (!cleanup_decl || TREE_CODE (cleanup_decl) != FUNCTION_DECL) + { + error ("cleanup argument not a function"); + *no_add_attrs = true; + return NULL_TREE; + } + + /* That the function has proper type is checked with the + eventual call to build_function_call. */ + + return NULL_TREE; +} + +/* Handle a "warn_unused_result" attribute. No special handling. */ + +static tree +handle_warn_unused_result_attribute (tree *node, tree name, + tree ARG_UNUSED (args), + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + /* Ignore the attribute for functions not returning any value. */ + if (VOID_TYPE_P (TREE_TYPE (*node))) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "sentinel" attribute. */ + +static tree +handle_sentinel_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), bool *no_add_attrs) +{ + if (!prototype_p (*node)) + { + warning (OPT_Wattributes, + "%qE attribute requires prototypes with named arguments", name); + *no_add_attrs = true; + } + else + { + if (!stdarg_p (*node)) + { + warning (OPT_Wattributes, + "%qE attribute only applies to variadic functions", name); + *no_add_attrs = true; + } + } + + if (args) + { + tree position = TREE_VALUE (args); + if (position && TREE_CODE (position) != IDENTIFIER_NODE + && TREE_CODE (position) != FUNCTION_DECL) + position = default_conversion (position); + + if (TREE_CODE (position) != INTEGER_CST + || !INTEGRAL_TYPE_P (TREE_TYPE (position))) + { + warning (OPT_Wattributes, + "requested position is not an integer constant"); + *no_add_attrs = true; + } + else + { + if (tree_int_cst_lt (position, integer_zero_node)) + { + warning (OPT_Wattributes, + "requested position is less than zero"); + *no_add_attrs = true; + } + } + } + + return NULL_TREE; +} + +/* Handle a "type_generic" attribute. */ + +static tree +handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), + tree ARG_UNUSED (args), int ARG_UNUSED (flags), + bool * ARG_UNUSED (no_add_attrs)) +{ + /* Ensure we have a function type. */ + gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); + + /* Ensure we have a variadic function. */ + gcc_assert (!prototype_p (*node) || stdarg_p (*node)); + + return NULL_TREE; +} + +/* Handle a "target" attribute. */ + +static tree +handle_target_attribute (tree *node, tree name, tree args, int flags, + bool *no_add_attrs) +{ + /* Ensure we have a function type. */ + if (TREE_CODE (*node) != FUNCTION_DECL) + { + warning (OPT_Wattributes, "%qE attribute ignored", name); + *no_add_attrs = true; + } + else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node))) + { + 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; + + 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 % 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; +} diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c index c4a0ce89c38..326ff6f49e2 100644 --- a/gcc/c-family/c-common.c +++ b/gcc/c-family/c-common.c @@ -306,102 +306,9 @@ static tree check_case_value (location_t, tree); static bool check_case_bounds (location_t, tree, tree, tree *, tree *, bool *); -static tree handle_packed_attribute (tree *, tree, tree, int, bool *); -static tree handle_nocommon_attribute (tree *, tree, tree, int, bool *); -static tree handle_common_attribute (tree *, tree, tree, int, bool *); -static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); -static tree handle_hot_attribute (tree *, tree, tree, int, bool *); -static tree handle_cold_attribute (tree *, tree, tree, int, bool *); -static tree handle_no_sanitize_address_attribute (tree *, tree, tree, - int, bool *); -static tree handle_no_address_safety_analysis_attribute (tree *, tree, tree, - int, bool *); -static tree handle_no_sanitize_undefined_attribute (tree *, tree, tree, int, - bool *); -static tree handle_stack_protect_attribute (tree *, tree, tree, int, bool *); -static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); -static tree handle_noclone_attribute (tree *, tree, tree, int, bool *); -static tree handle_noicf_attribute (tree *, tree, tree, int, bool *); -static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); -static tree handle_always_inline_attribute (tree *, tree, tree, int, - bool *); -static tree handle_gnu_inline_attribute (tree *, tree, tree, int, bool *); -static tree handle_artificial_attribute (tree *, tree, tree, int, bool *); -static tree handle_flatten_attribute (tree *, tree, tree, int, bool *); -static tree handle_error_attribute (tree *, tree, tree, int, bool *); -static tree handle_used_attribute (tree *, tree, tree, int, bool *); -static tree handle_externally_visible_attribute (tree *, tree, tree, int, - bool *); -static tree handle_no_reorder_attribute (tree *, tree, tree, int, - bool *); -static tree handle_const_attribute (tree *, tree, tree, int, bool *); -static tree handle_transparent_union_attribute (tree *, tree, tree, - int, bool *); -static tree handle_scalar_storage_order_attribute (tree *, tree, tree, - int, bool *); -static tree handle_constructor_attribute (tree *, tree, tree, int, bool *); -static tree handle_destructor_attribute (tree *, tree, tree, int, bool *); -static tree handle_mode_attribute (tree *, tree, tree, int, bool *); -static tree handle_section_attribute (tree *, tree, tree, int, bool *); -static tree handle_aligned_attribute (tree *, tree, tree, int, bool *); -static tree handle_weak_attribute (tree *, tree, tree, int, bool *) ; -static tree handle_noplt_attribute (tree *, tree, tree, int, bool *) ; -static tree handle_alias_ifunc_attribute (bool, tree *, tree, tree, bool *); -static tree handle_ifunc_attribute (tree *, tree, tree, int, bool *); -static tree handle_alias_attribute (tree *, tree, tree, int, bool *); -static tree handle_weakref_attribute (tree *, tree, tree, int, bool *) ; -static tree handle_visibility_attribute (tree *, tree, tree, int, - bool *); -static tree handle_tls_model_attribute (tree *, tree, tree, int, - bool *); -static tree handle_no_instrument_function_attribute (tree *, tree, - tree, int, bool *); -static tree handle_no_profile_instrument_function_attribute (tree *, tree, - tree, int, bool *); -static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); -static tree handle_returns_twice_attribute (tree *, tree, tree, int, bool *); -static tree handle_no_limit_stack_attribute (tree *, tree, tree, int, - bool *); -static tree handle_pure_attribute (tree *, tree, tree, int, bool *); -static tree handle_tm_attribute (tree *, tree, tree, int, bool *); -static tree handle_tm_wrap_attribute (tree *, tree, tree, int, bool *); -static tree handle_novops_attribute (tree *, tree, tree, int, bool *); -static tree handle_deprecated_attribute (tree *, tree, tree, int, - bool *); -static tree handle_vector_size_attribute (tree *, tree, tree, int, - bool *); -static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); -static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); -static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *); -static tree handle_warn_unused_result_attribute (tree *, tree, tree, int, - bool *); -static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); -static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); -static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *); -static tree handle_alloc_align_attribute (tree *, tree, tree, int, bool *); -static tree handle_assume_aligned_attribute (tree *, tree, tree, int, bool *); -static tree handle_target_attribute (tree *, tree, tree, int, bool *); -static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *); -static tree handle_optimize_attribute (tree *, tree, tree, int, bool *); -static tree ignore_attribute (tree *, tree, tree, int, bool *); -static tree handle_no_split_stack_attribute (tree *, tree, tree, int, bool *); -static tree handle_fnspec_attribute (tree *, tree, tree, int, bool *); -static tree handle_warn_unused_attribute (tree *, tree, tree, int, bool *); -static tree handle_returns_nonnull_attribute (tree *, tree, tree, int, bool *); -static tree handle_omp_declare_simd_attribute (tree *, tree, tree, int, - bool *); -static tree handle_simd_attribute (tree *, tree, tree, int, bool *); -static tree handle_omp_declare_target_attribute (tree *, tree, tree, int, - bool *); -static tree handle_designated_init_attribute (tree *, tree, tree, int, bool *); -static tree handle_bnd_variable_size_attribute (tree *, tree, tree, int, bool *); -static tree handle_bnd_legacy (tree *, tree, tree, int, bool *); -static tree handle_bnd_instrument (tree *, tree, tree, int, bool *); -static tree handle_fallthrough_attribute (tree *, tree, tree, int, bool *); static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT); static bool nonnull_check_p (tree, unsigned HOST_WIDE_INT); -static bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); static int resort_field_decl_cmp (const void *, const void *); /* Reserved words. The third field is a mask: keywords are disabled @@ -652,229 +559,6 @@ const struct c_common_resword c_common_reswords[] = const unsigned int num_c_common_reswords = sizeof c_common_reswords / sizeof (struct c_common_resword); -/* Table of machine-independent attributes common to all C-like languages. - - All attributes referencing arguments should be additionally processed - in chkp_copy_function_type_adding_bounds for correct instrumentation - by Pointer Bounds Checker. - Current list of processed common attributes: nonnull. */ -const struct attribute_spec c_common_attribute_table[] = -{ - /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, - affects_type_identity } */ - { "packed", 0, 0, false, false, false, - handle_packed_attribute , false}, - { "nocommon", 0, 0, true, false, false, - handle_nocommon_attribute, false}, - { "common", 0, 0, true, false, false, - handle_common_attribute, false }, - /* FIXME: logically, noreturn attributes should be listed as - "false, true, true" and apply to function types. But implementing this - would require all the places in the compiler that use TREE_THIS_VOLATILE - on a decl to identify non-returning functions to be located and fixed - to check the function type instead. */ - { "noreturn", 0, 0, true, false, false, - handle_noreturn_attribute, false }, - { "volatile", 0, 0, true, false, false, - handle_noreturn_attribute, false }, - { "stack_protect", 0, 0, true, false, false, - handle_stack_protect_attribute, false }, - { "noinline", 0, 0, true, false, false, - handle_noinline_attribute, false }, - { "noclone", 0, 0, true, false, false, - handle_noclone_attribute, false }, - { "no_icf", 0, 0, true, false, false, - handle_noicf_attribute, false }, - { "leaf", 0, 0, true, false, false, - handle_leaf_attribute, false }, - { "always_inline", 0, 0, true, false, false, - handle_always_inline_attribute, false }, - { "gnu_inline", 0, 0, true, false, false, - handle_gnu_inline_attribute, false }, - { "artificial", 0, 0, true, false, false, - handle_artificial_attribute, false }, - { "flatten", 0, 0, true, false, false, - handle_flatten_attribute, false }, - { "used", 0, 0, true, false, false, - handle_used_attribute, false }, - { "unused", 0, 0, false, false, false, - handle_unused_attribute, false }, - { "externally_visible", 0, 0, true, false, false, - handle_externally_visible_attribute, false }, - { "no_reorder", 0, 0, true, false, false, - handle_no_reorder_attribute, false }, - /* The same comments as for noreturn attributes apply to const ones. */ - { "const", 0, 0, true, false, false, - handle_const_attribute, false }, - { "scalar_storage_order", 1, 1, false, false, false, - handle_scalar_storage_order_attribute, false }, - { "transparent_union", 0, 0, false, false, false, - handle_transparent_union_attribute, false }, - { "constructor", 0, 1, true, false, false, - handle_constructor_attribute, false }, - { "destructor", 0, 1, true, false, false, - handle_destructor_attribute, false }, - { "mode", 1, 1, false, true, false, - handle_mode_attribute, false }, - { "section", 1, 1, true, false, false, - handle_section_attribute, false }, - { "aligned", 0, 1, false, false, false, - handle_aligned_attribute, false }, - { "weak", 0, 0, true, false, false, - handle_weak_attribute, false }, - { "noplt", 0, 0, true, false, false, - handle_noplt_attribute, false }, - { "ifunc", 1, 1, true, false, false, - handle_ifunc_attribute, false }, - { "alias", 1, 1, true, false, false, - handle_alias_attribute, false }, - { "weakref", 0, 1, true, false, false, - handle_weakref_attribute, false }, - { "no_instrument_function", 0, 0, true, false, false, - handle_no_instrument_function_attribute, - false }, - { "no_profile_instrument_function", 0, 0, true, false, false, - handle_no_profile_instrument_function_attribute, - false }, - { "malloc", 0, 0, true, false, false, - handle_malloc_attribute, false }, - { "returns_twice", 0, 0, true, false, false, - handle_returns_twice_attribute, false }, - { "no_stack_limit", 0, 0, true, false, false, - handle_no_limit_stack_attribute, false }, - { "pure", 0, 0, true, false, false, - handle_pure_attribute, false }, - { "transaction_callable", 0, 0, false, true, false, - handle_tm_attribute, false }, - { "transaction_unsafe", 0, 0, false, true, false, - handle_tm_attribute, true }, - { "transaction_safe", 0, 0, false, true, false, - handle_tm_attribute, true }, - { "transaction_safe_dynamic", 0, 0, true, false, false, - handle_tm_attribute, false }, - { "transaction_may_cancel_outer", 0, 0, false, true, false, - handle_tm_attribute, false }, - /* ??? These two attributes didn't make the transition from the - Intel language document to the multi-vendor language document. */ - { "transaction_pure", 0, 0, false, true, false, - handle_tm_attribute, false }, - { "transaction_wrap", 1, 1, true, false, false, - handle_tm_wrap_attribute, false }, - /* For internal use (marking of builtins) only. The name contains space - to prevent its usage in source code. */ - { "no vops", 0, 0, true, false, false, - handle_novops_attribute, false }, - { "deprecated", 0, 1, false, false, false, - handle_deprecated_attribute, false }, - { "vector_size", 1, 1, false, true, false, - handle_vector_size_attribute, true }, - { "visibility", 1, 1, false, false, false, - handle_visibility_attribute, false }, - { "tls_model", 1, 1, true, false, false, - handle_tls_model_attribute, false }, - { "nonnull", 0, -1, false, true, true, - handle_nonnull_attribute, false }, - { "nothrow", 0, 0, true, false, false, - handle_nothrow_attribute, false }, - { "may_alias", 0, 0, false, true, false, NULL, false }, - { "cleanup", 1, 1, true, false, false, - handle_cleanup_attribute, false }, - { "warn_unused_result", 0, 0, false, true, true, - handle_warn_unused_result_attribute, false }, - { "sentinel", 0, 1, false, true, true, - handle_sentinel_attribute, false }, - /* For internal use (marking of builtins) only. The name contains space - to prevent its usage in source code. */ - { "type generic", 0, 0, false, true, true, - handle_type_generic_attribute, false }, - { "alloc_size", 1, 2, false, true, true, - handle_alloc_size_attribute, false }, - { "cold", 0, 0, true, false, false, - handle_cold_attribute, false }, - { "hot", 0, 0, true, false, false, - handle_hot_attribute, false }, - { "no_address_safety_analysis", - 0, 0, true, false, false, - handle_no_address_safety_analysis_attribute, - false }, - { "no_sanitize_address", 0, 0, true, false, false, - handle_no_sanitize_address_attribute, - false }, - { "no_sanitize_thread", 0, 0, true, false, false, - handle_no_sanitize_address_attribute, - false }, - { "no_sanitize_undefined", 0, 0, true, false, false, - handle_no_sanitize_undefined_attribute, - false }, - { "warning", 1, 1, true, false, false, - handle_error_attribute, false }, - { "error", 1, 1, true, false, false, - handle_error_attribute, false }, - { "target", 1, -1, true, false, false, - handle_target_attribute, false }, - { "target_clones", 1, -1, true, false, false, - handle_target_clones_attribute, false }, - { "optimize", 1, -1, true, false, false, - handle_optimize_attribute, false }, - /* For internal use only. The leading '*' both prevents its usage in - source code and signals that it may be overridden by machine tables. */ - { "*tm regparm", 0, 0, false, true, true, - ignore_attribute, false }, - { "no_split_stack", 0, 0, true, false, false, - handle_no_split_stack_attribute, false }, - /* For internal use (marking of builtins and runtime functions) only. - The name contains space to prevent its usage in source code. */ - { "fn spec", 1, 1, false, true, true, - handle_fnspec_attribute, false }, - { "warn_unused", 0, 0, false, false, false, - handle_warn_unused_attribute, false }, - { "returns_nonnull", 0, 0, false, true, true, - handle_returns_nonnull_attribute, false }, - { "omp declare simd", 0, -1, true, false, false, - handle_omp_declare_simd_attribute, false }, - { "cilk simd function", 0, -1, true, false, false, - handle_omp_declare_simd_attribute, false }, - { "simd", 0, 1, true, false, false, - handle_simd_attribute, false }, - { "omp declare target", 0, 0, true, false, false, - handle_omp_declare_target_attribute, false }, - { "omp declare target link", 0, 0, true, false, false, - handle_omp_declare_target_attribute, false }, - { "alloc_align", 1, 1, false, true, true, - handle_alloc_align_attribute, false }, - { "assume_aligned", 1, 2, false, true, true, - handle_assume_aligned_attribute, false }, - { "designated_init", 0, 0, false, true, false, - handle_designated_init_attribute, false }, - { "bnd_variable_size", 0, 0, true, false, false, - handle_bnd_variable_size_attribute, false }, - { "bnd_legacy", 0, 0, true, false, false, - handle_bnd_legacy, false }, - { "bnd_instrument", 0, 0, true, false, false, - handle_bnd_instrument, false }, - { "fallthrough", 0, 0, false, false, false, - handle_fallthrough_attribute, false }, - { NULL, 0, 0, false, false, false, NULL, false } -}; - -/* Give the specifications for the format attributes, used by C and all - descendants. - - All attributes referencing arguments should be additionally processed - in chkp_copy_function_type_adding_bounds for correct instrumentation - by Pointer Bounds Checker. - Current list of processed format attributes: format, format_arg. */ -const struct attribute_spec c_common_format_attribute_table[] = -{ - /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, - affects_type_identity } */ - { "format", 3, 3, false, true, true, - handle_format_attribute, false }, - { "format_arg", 1, 1, false, true, true, - handle_format_arg_attribute, false }, - { NULL, 0, 0, false, false, false, NULL, false } -}; - /* Return identifier for address space AS. */ const char * @@ -5471,2933 +5155,246 @@ c_init_attributes (void) #undef DEF_ATTR_TREE_LIST } -/* 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) +/* Check whether ALIGN is a valid user-specified alignment. If so, + return its base-2 log; if not, output an error and return -1. If + ALLOW_ZERO then 0 is valid and should result in a return of -1 with + no error. */ +int +check_user_alignment (const_tree align, bool allow_zero) { - 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. */ + int i; -static tree -handle_packed_attribute (tree *node, tree name, tree ARG_UNUSED (args), - int flags, bool *no_add_attrs) -{ - if (TYPE_P (*node)) + if (error_operand_p (align)) + return -1; + if (TREE_CODE (align) != INTEGER_CST + || !INTEGRAL_TYPE_P (TREE_TYPE (align))) { - if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) - *node = build_variant_type_copy (*node); - TYPE_PACKED (*node) = 1; + error ("requested alignment is not an integer constant"); + return -1; } - else if (TREE_CODE (*node) == FIELD_DECL) + else if (allow_zero && integer_zerop (align)) + return -1; + else if (tree_int_cst_sgn (align) == -1 + || (i = tree_log2 (align)) == -1) { - if (TYPE_ALIGN (TREE_TYPE (*node)) <= BITS_PER_UNIT - /* Still pack bitfields. */ - && ! DECL_INITIAL (*node)) - warning (OPT_Wattributes, - "%qE attribute ignored for field of type %qT", - name, TREE_TYPE (*node)); - else - DECL_PACKED (*node) = 1; + error ("requested alignment is not a positive power of 2"); + return -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 + else if (i >= HOST_BITS_PER_INT - LOG2_BITS_PER_UNIT) { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; + error ("requested alignment is too large"); + return -1; } - - return NULL_TREE; + return i; } -/* Handle a "nocommon" attribute; arguments as in - struct attribute_spec.handler. */ +/* Determine the ELF symbol visibility for DECL, which is either a + variable or a function. It is an error to use this function if a + definition of DECL is not available in this translation unit. + Returns true if the final visibility has been determined by this + function; false if the caller is free to make additional + modifications. */ -static tree -handle_nocommon_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) +bool +c_determine_visibility (tree decl) { - if (VAR_P (*node)) - DECL_COMMON (*node) = 0; - else + gcc_assert (VAR_OR_FUNCTION_DECL_P (decl)); + + /* If the user explicitly specified the visibility with an + attribute, honor that. DECL_VISIBILITY will have been set during + the processing of the attribute. We check for an explicit + attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, + to distinguish the use of an attribute from the use of a "#pragma + GCC visibility push(...)"; in the latter case we still want other + considerations to be able to overrule the #pragma. */ + if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)) + || (TARGET_DLLIMPORT_DECL_ATTRIBUTES + && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)) + || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))))) + return true; + + /* Set default visibility to whatever the user supplied with + visibility_specified depending on #pragma GCC visibility. */ + if (!DECL_VISIBILITY_SPECIFIED (decl)) { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; + if (visibility_options.inpragma + || DECL_VISIBILITY (decl) != default_visibility) + { + DECL_VISIBILITY (decl) = default_visibility; + DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; + /* If visibility changed and DECL already has DECL_RTL, ensure + symbol flags are updated. */ + if (((VAR_P (decl) && TREE_STATIC (decl)) + || TREE_CODE (decl) == FUNCTION_DECL) + && DECL_RTL_SET_P (decl)) + make_decl_rtl (decl); + } } - - return NULL_TREE; + return false; } -/* Handle a "common" attribute; arguments as in - struct attribute_spec.handler. */ +/* Check the argument list of a function call for null in argument slots + that are marked as requiring a non-null pointer argument. The NARGS + arguments are passed in the array ARGARRAY. */ -static tree -handle_common_attribute (tree *node, tree name, tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) +static void +check_function_nonnull (location_t loc, tree attrs, int nargs, tree *argarray) { - if (VAR_P (*node)) - DECL_COMMON (*node) = 1; - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } + tree a; + int i; - return NULL_TREE; -} + attrs = lookup_attribute ("nonnull", attrs); + if (attrs == NULL_TREE) + return; -/* Handle a "noreturn" attribute; arguments as in - struct attribute_spec.handler. */ + a = attrs; + /* See if any of the nonnull attributes has no arguments. If so, + then every pointer argument is checked (in which case the check + for pointer type is done in check_nonnull_arg). */ + if (TREE_VALUE (a) != NULL_TREE) + do + a = lookup_attribute ("nonnull", TREE_CHAIN (a)); + while (a != NULL_TREE && TREE_VALUE (a) != NULL_TREE); -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))); + if (a != NULL_TREE) + for (i = 0; i < nargs; i++) + check_function_arguments_recurse (check_nonnull_arg, &loc, argarray[i], + i + 1); else { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } + /* Walk the argument list. If we encounter an argument number we + should check for non-null, do it. */ + for (i = 0; i < nargs; i++) + { + for (a = attrs; ; a = TREE_CHAIN (a)) + { + a = lookup_attribute ("nonnull", a); + if (a == NULL_TREE || nonnull_check_p (TREE_VALUE (a), i + 1)) + break; + } - return NULL_TREE; + if (a != NULL_TREE) + check_function_arguments_recurse (check_nonnull_arg, &loc, + argarray[i], i + 1); + } + } } -/* Handle a "hot" and attribute; arguments as in - struct attribute_spec.handler. */ +/* Check that the Nth argument of a function call (counting backwards + from the end) is a (pointer)0. The NARGS arguments are passed in the + array ARGARRAY. */ -static tree -handle_hot_attribute (tree *node, tree name, tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) +static void +check_function_sentinel (const_tree fntype, int nargs, tree *argarray) { - if (TREE_CODE (*node) == FUNCTION_DECL - || TREE_CODE (*node) == LABEL_DECL) + tree attr = lookup_attribute ("sentinel", TYPE_ATTRIBUTES (fntype)); + + if (attr) { - if (lookup_attribute ("cold", DECL_ATTRIBUTES (*node)) != NULL) + int len = 0; + int pos = 0; + tree sentinel; + function_args_iterator iter; + tree t; + + /* Skip over the named arguments. */ + FOREACH_FUNCTION_ARGS (fntype, t, iter) { - warning (OPT_Wattributes, "%qE attribute ignored due to conflict " - "with attribute %qs", name, "cold"); - *no_add_attrs = true; + if (len == nargs) + break; + len++; } - /* 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. */ + if (TREE_VALUE (attr)) + { + tree p = TREE_VALUE (TREE_VALUE (attr)); + pos = TREE_INT_CST_LOW (p); + } -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) + /* The sentinel must be one of the varargs, i.e. + in position >= the number of fixed arguments. */ + if ((nargs - 1 - pos) < len) { - warning (OPT_Wattributes, "%qE attribute ignored due to conflict " - "with attribute %qs", name, "hot"); - *no_add_attrs = true; + warning (OPT_Wformat_, + "not enough variable arguments to fit a sentinel"); + return; } - /* 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; + /* Validate the sentinel. */ + sentinel = argarray[nargs - 1 - pos]; + if ((!POINTER_TYPE_P (TREE_TYPE (sentinel)) + || !integer_zerop (sentinel)) + /* Although __null (in C++) is only an integer we allow it + nevertheless, as we are guaranteed that it's exactly + as wide as a pointer, and we don't want to force + users to cast the NULL they have written there. + We warn with -Wstrict-null-sentinel, though. */ + && (warn_strict_null_sentinel || null_node != sentinel)) + warning (OPT_Wformat_, "missing sentinel in function call"); + } } -/* Handle a "no_sanitize_address" attribute; arguments as in - struct attribute_spec.handler. */ +/* Helper for check_function_nonnull; given a list of operands which + must be non-null in ARGS, determine if operand PARAM_NUM should be + checked. */ -static tree -handle_no_sanitize_address_attribute (tree *node, tree name, tree, int, - bool *no_add_attrs) +static bool +nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) { - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } + unsigned HOST_WIDE_INT arg_num = 0; - return NULL_TREE; -} + for (; args; args = TREE_CHAIN (args)) + { + bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); -/* Handle a "no_address_safety_analysis" attribute; arguments as in - struct attribute_spec.handler. */ + gcc_assert (found); -static tree -handle_no_address_safety_analysis_attribute (tree *node, tree name, tree, int, - bool *no_add_attrs) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - warning (OPT_Wattributes, "%qE attribute ignored", name); - else if (!lookup_attribute ("no_sanitize_address", DECL_ATTRIBUTES (*node))) - DECL_ATTRIBUTES (*node) - = tree_cons (get_identifier ("no_sanitize_address"), - NULL_TREE, DECL_ATTRIBUTES (*node)); - *no_add_attrs = true; - return NULL_TREE; + if (arg_num == param_num) + return true; + } + return false; } -/* Handle a "no_sanitize_undefined" attribute; arguments as in - struct attribute_spec.handler. */ +/* Check that the function argument PARAM (which is operand number + PARAM_NUM) is non-null. This is called by check_function_nonnull + via check_function_arguments_recurse. */ -static tree -handle_no_sanitize_undefined_attribute (tree *node, tree name, tree, int, - bool *no_add_attrs) +static void +check_nonnull_arg (void *ctx, tree param, unsigned HOST_WIDE_INT param_num) { - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } + location_t *ploc = (location_t *) ctx; - return NULL_TREE; -} + /* Just skip checking the argument if it's not a pointer. This can + happen if the "nonnull" attribute was given without an operand + list (which means to check every pointer argument). */ -/* Handle a "stack_protect" attribute; arguments as in - struct attribute_spec.handler. */ -static tree -handle_stack_protect_attribute (tree *node, tree name, tree, int, - bool *no_add_attrs) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - else - DECL_ATTRIBUTES (*node) - = tree_cons (get_identifier ("stack_protect"), - NULL_TREE, DECL_ATTRIBUTES (*node)); + if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) + return; - return NULL_TREE; + if (integer_zerop (param)) + warning_at (*ploc, OPT_Wnonnull, "null argument where non-null required " + "(argument %lu)", (unsigned long) param_num); } -/* Handle a "noinline" attribute; arguments as in - struct attribute_spec.handler. */ +/* Helper for nonnull attribute handling; fetch the operand number + from the attribute argument list. */ -static tree -handle_noinline_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) +bool +get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) { - if (TREE_CODE (*node) == FUNCTION_DECL) + /* Verify the arg number is a small constant. */ + if (tree_fits_uhwi_p (arg_num_expr)) { - 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; + *valp = TREE_INT_CST_LOW (arg_num_expr); + return true; } else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; + return false; } -/* Handle a "noclone" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_noclone_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "no_icf" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_noicf_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - - -/* Handle a "always_inline" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_always_inline_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - if (TREE_CODE (*node) == FUNCTION_DECL) - { - if (lookup_attribute ("noinline", DECL_ATTRIBUTES (*node))) - { - warning (OPT_Wattributes, "%qE attribute ignored due to conflict " - "with %qs attribute", name, "noinline"); - *no_add_attrs = true; - } - else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node))) - { - warning (OPT_Wattributes, "%qE attribute ignored due to conflict " - "with %qs attribute", name, "target_clones"); - *no_add_attrs = true; - } - else - /* Set the attribute and mark it for disregarding inline - limits. */ - DECL_DISREGARD_INLINE_LIMITS (*node) = 1; - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "gnu_inline" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_gnu_inline_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) - { - /* Do nothing else, just set the attribute. We'll get at - it later with lookup_attribute. */ - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "leaf" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_leaf_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - if (!TREE_PUBLIC (*node)) - { - warning (OPT_Wattributes, "%qE attribute has no effect on unit local functions", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle an "artificial" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_artificial_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - if (TREE_CODE (*node) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (*node)) - { - /* Do nothing else, just set the attribute. We'll get at - it later with lookup_attribute. */ - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "flatten" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_flatten_attribute (tree *node, tree name, - tree args ATTRIBUTE_UNUSED, - int flags ATTRIBUTE_UNUSED, bool *no_add_attrs) -{ - if (TREE_CODE (*node) == FUNCTION_DECL) - /* Do nothing else, just set the attribute. We'll get at - it later with lookup_attribute. */ - ; - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "warning" or "error" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_error_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - if (TREE_CODE (*node) == FUNCTION_DECL - && TREE_CODE (TREE_VALUE (args)) == STRING_CST) - /* Do nothing else, just set the attribute. We'll get at - it later with lookup_attribute. */ - ; - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "used" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_used_attribute (tree *pnode, tree name, tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - tree node = *pnode; - - if (TREE_CODE (node) == FUNCTION_DECL - || (VAR_P (node) && TREE_STATIC (node)) - || (TREE_CODE (node) == TYPE_DECL)) - { - TREE_USED (node) = 1; - DECL_PRESERVE_P (node) = 1; - if (VAR_P (node)) - DECL_READ_P (node) = 1; - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "unused" attribute; arguments as in - struct attribute_spec.handler. */ - -tree -handle_unused_attribute (tree *node, tree name, tree ARG_UNUSED (args), - int flags, bool *no_add_attrs) -{ - if (DECL_P (*node)) - { - tree decl = *node; - - if (TREE_CODE (decl) == PARM_DECL - || VAR_OR_FUNCTION_DECL_P (decl) - || TREE_CODE (decl) == LABEL_DECL - || TREE_CODE (decl) == CONST_DECL - || TREE_CODE (decl) == TYPE_DECL) - { - TREE_USED (decl) = 1; - if (VAR_P (decl) || TREE_CODE (decl) == PARM_DECL) - DECL_READ_P (decl) = 1; - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - } - else - { - if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) - *node = build_variant_type_copy (*node); - TREE_USED (*node) = 1; - } - - return NULL_TREE; -} - -/* Handle a "externally_visible" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_externally_visible_attribute (tree *pnode, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - tree node = *pnode; - - if (VAR_OR_FUNCTION_DECL_P (node)) - { - if ((!TREE_STATIC (node) && TREE_CODE (node) != FUNCTION_DECL - && !DECL_EXTERNAL (node)) || !TREE_PUBLIC (node)) - { - warning (OPT_Wattributes, - "%qE attribute have effect only on public objects", name); - *no_add_attrs = true; - } - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle the "no_reorder" attribute. Arguments as in - struct attribute_spec.handler. */ - -static tree -handle_no_reorder_attribute (tree *pnode, - tree name, - tree, - int, - bool *no_add_attrs) -{ - tree node = *pnode; - - if (!VAR_OR_FUNCTION_DECL_P (node) - && !(TREE_STATIC (node) || DECL_EXTERNAL (node))) - { - warning (OPT_Wattributes, - "%qE attribute only affects top level objects", - name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "const" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_const_attribute (tree *node, tree name, tree ARG_UNUSED (args), - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - tree type = TREE_TYPE (*node); - - /* See FIXME comment on noreturn in c_common_attribute_table. */ - if (TREE_CODE (*node) == FUNCTION_DECL) - TREE_READONLY (*node) = 1; - else if (TREE_CODE (type) == POINTER_TYPE - && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) - TREE_TYPE (*node) - = (build_qualified_type - (build_pointer_type - (build_type_variant (TREE_TYPE (type), 1, - TREE_THIS_VOLATILE (TREE_TYPE (type)))), - TYPE_QUALS (type))); - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "scalar_storage_order" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_scalar_storage_order_attribute (tree *node, tree name, tree args, - int flags, bool *no_add_attrs) -{ - tree id = TREE_VALUE (args); - tree type; - - if (TREE_CODE (*node) == TYPE_DECL - && ! (flags & ATTR_FLAG_CXX11)) - node = &TREE_TYPE (*node); - type = *node; - - if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN) - { - error ("scalar_storage_order is not supported because endianness " - "is not uniform"); - return NULL_TREE; - } - - if (RECORD_OR_UNION_TYPE_P (type) && !c_dialect_cxx ()) - { - bool reverse = false; - - if (TREE_CODE (id) == STRING_CST - && strcmp (TREE_STRING_POINTER (id), "big-endian") == 0) - reverse = !BYTES_BIG_ENDIAN; - else if (TREE_CODE (id) == STRING_CST - && strcmp (TREE_STRING_POINTER (id), "little-endian") == 0) - reverse = BYTES_BIG_ENDIAN; - else - { - error ("scalar_storage_order argument must be one of \"big-endian\"" - " or \"little-endian\""); - return NULL_TREE; - } - - if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) - { - if (reverse) - /* A type variant isn't good enough, since we don't want a cast - to such a type to be removed as a no-op. */ - *node = type = build_duplicate_type (type); - } - - TYPE_REVERSE_STORAGE_ORDER (type) = reverse; - return NULL_TREE; - } - - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - return NULL_TREE; -} - -/* Handle a "transparent_union" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_transparent_union_attribute (tree *node, tree name, - tree ARG_UNUSED (args), int flags, - bool *no_add_attrs) -{ - tree type; - - *no_add_attrs = true; - - if (TREE_CODE (*node) == TYPE_DECL - && ! (flags & ATTR_FLAG_CXX11)) - node = &TREE_TYPE (*node); - type = *node; - - if (TREE_CODE (type) == UNION_TYPE) - { - /* Make sure that the first field will work for a transparent union. - If the type isn't complete yet, leave the check to the code in - finish_struct. */ - if (TYPE_SIZE (type)) - { - tree first = first_field (type); - if (first == NULL_TREE - || DECL_ARTIFICIAL (first) - || TYPE_MODE (type) != DECL_MODE (first)) - goto ignored; - } - - if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) - { - /* If the type isn't complete yet, setting the flag - on a variant wouldn't ever be checked. */ - if (!TYPE_SIZE (type)) - goto ignored; - - /* build_duplicate_type doesn't work for C++. */ - if (c_dialect_cxx ()) - goto ignored; - - /* A type variant isn't good enough, since we don't want a cast - to such a type to be removed as a no-op. */ - *node = type = build_duplicate_type (type); - } - - for (tree t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t)) - TYPE_TRANSPARENT_AGGR (t) = 1; - return NULL_TREE; - } - - ignored: - warning (OPT_Wattributes, "%qE attribute ignored", name); - return NULL_TREE; -} - -/* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to - get the requested priority for a constructor or destructor, - possibly issuing diagnostics for invalid or reserved - priorities. */ - -static priority_type -get_priority (tree args, bool is_destructor) -{ - HOST_WIDE_INT pri; - tree arg; - - if (!args) - return DEFAULT_INIT_PRIORITY; - - if (!SUPPORTS_INIT_PRIORITY) - { - if (is_destructor) - error ("destructor priorities are not supported"); - else - error ("constructor priorities are not supported"); - return DEFAULT_INIT_PRIORITY; - } - - arg = TREE_VALUE (args); - if (TREE_CODE (arg) == IDENTIFIER_NODE) - goto invalid; - if (arg == error_mark_node) - return DEFAULT_INIT_PRIORITY; - arg = default_conversion (arg); - if (!tree_fits_shwi_p (arg) - || !INTEGRAL_TYPE_P (TREE_TYPE (arg))) - goto invalid; - - pri = tree_to_shwi (arg); - if (pri < 0 || pri > MAX_INIT_PRIORITY) - goto invalid; - - if (pri <= MAX_RESERVED_INIT_PRIORITY) - { - if (is_destructor) - warning (0, - "destructor priorities from 0 to %d are reserved " - "for the implementation", - MAX_RESERVED_INIT_PRIORITY); - else - warning (0, - "constructor priorities from 0 to %d are reserved " - "for the implementation", - MAX_RESERVED_INIT_PRIORITY); - } - return pri; - - invalid: - if (is_destructor) - error ("destructor priorities must be integers from 0 to %d inclusive", - MAX_INIT_PRIORITY); - else - error ("constructor priorities must be integers from 0 to %d inclusive", - MAX_INIT_PRIORITY); - return DEFAULT_INIT_PRIORITY; -} - -/* Handle a "constructor" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_constructor_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - tree decl = *node; - tree type = TREE_TYPE (decl); - - if (TREE_CODE (decl) == FUNCTION_DECL - && TREE_CODE (type) == FUNCTION_TYPE - && decl_function_context (decl) == 0) - { - priority_type priority; - DECL_STATIC_CONSTRUCTOR (decl) = 1; - priority = get_priority (args, /*is_destructor=*/false); - SET_DECL_INIT_PRIORITY (decl, priority); - TREE_USED (decl) = 1; - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Handle a "destructor" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_destructor_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), - bool *no_add_attrs) -{ - tree decl = *node; - tree type = TREE_TYPE (decl); - - if (TREE_CODE (decl) == FUNCTION_DECL - && TREE_CODE (type) == FUNCTION_TYPE - && decl_function_context (decl) == 0) - { - priority_type priority; - DECL_STATIC_DESTRUCTOR (decl) = 1; - priority = get_priority (args, /*is_destructor=*/true); - SET_DECL_FINI_PRIORITY (decl, priority); - TREE_USED (decl) = 1; - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - return NULL_TREE; -} - -/* Nonzero if the mode is a valid vector mode for this architecture. - This returns nonzero even if there is no hardware support for the - vector mode, but we can emulate with narrower modes. */ - -static bool -vector_mode_valid_p (machine_mode mode) -{ - enum mode_class mclass = GET_MODE_CLASS (mode); - machine_mode innermode; - - /* Doh! What's going on? */ - if (mclass != MODE_VECTOR_INT - && mclass != MODE_VECTOR_FLOAT - && mclass != MODE_VECTOR_FRACT - && mclass != MODE_VECTOR_UFRACT - && mclass != MODE_VECTOR_ACCUM - && mclass != MODE_VECTOR_UACCUM) - return false; - - /* Hardware support. Woo hoo! */ - if (targetm.vector_mode_supported_p (mode)) - return true; - - innermode = GET_MODE_INNER (mode); - - /* We should probably return 1 if requesting V4DI and we have no DI, - but we have V2DI, but this is probably very unlikely. */ - - /* If we have support for the inner mode, we can safely emulate it. - We may not have V2DI, but me can emulate with a pair of DIs. */ - return targetm.scalar_mode_supported_p (innermode); -} - - -/* Handle a "mode" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_mode_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - tree type = *node; - tree ident = TREE_VALUE (args); - - *no_add_attrs = true; - - if (TREE_CODE (ident) != IDENTIFIER_NODE) - warning (OPT_Wattributes, "%qE attribute ignored", name); - else - { - int j; - const char *p = IDENTIFIER_POINTER (ident); - int len = strlen (p); - machine_mode mode = VOIDmode; - tree typefm; - bool valid_mode; - - if (len > 4 && p[0] == '_' && p[1] == '_' - && p[len - 1] == '_' && p[len - 2] == '_') - { - char *newp = (char *) alloca (len - 1); - - strcpy (newp, &p[2]); - newp[len - 4] = '\0'; - p = newp; - } - - /* Change this type to have a type with the specified mode. - First check for the special modes. */ - if (!strcmp (p, "byte")) - mode = byte_mode; - else if (!strcmp (p, "word")) - mode = word_mode; - else if (!strcmp (p, "pointer")) - mode = ptr_mode; - else if (!strcmp (p, "libgcc_cmp_return")) - mode = targetm.libgcc_cmp_return_mode (); - else if (!strcmp (p, "libgcc_shift_count")) - mode = targetm.libgcc_shift_count_mode (); - else if (!strcmp (p, "unwind_word")) - mode = targetm.unwind_word_mode (); - else - for (j = 0; j < NUM_MACHINE_MODES; j++) - if (!strcmp (p, GET_MODE_NAME (j))) - { - mode = (machine_mode) j; - break; - } - - if (mode == VOIDmode) - { - error ("unknown machine mode %qE", ident); - return NULL_TREE; - } - - valid_mode = false; - switch (GET_MODE_CLASS (mode)) - { - case MODE_INT: - case MODE_PARTIAL_INT: - case MODE_FLOAT: - case MODE_DECIMAL_FLOAT: - case MODE_FRACT: - case MODE_UFRACT: - case MODE_ACCUM: - case MODE_UACCUM: - valid_mode = targetm.scalar_mode_supported_p (mode); - break; - - case MODE_COMPLEX_INT: - case MODE_COMPLEX_FLOAT: - valid_mode = targetm.scalar_mode_supported_p (GET_MODE_INNER (mode)); - break; - - case MODE_VECTOR_INT: - case MODE_VECTOR_FLOAT: - case MODE_VECTOR_FRACT: - case MODE_VECTOR_UFRACT: - case MODE_VECTOR_ACCUM: - case MODE_VECTOR_UACCUM: - warning (OPT_Wattributes, "specifying vector types with " - "__attribute__ ((mode)) is deprecated"); - warning (OPT_Wattributes, - "use __attribute__ ((vector_size)) instead"); - valid_mode = vector_mode_valid_p (mode); - break; - - default: - break; - } - if (!valid_mode) - { - error ("unable to emulate %qs", p); - return NULL_TREE; - } - - if (POINTER_TYPE_P (type)) - { - addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (type)); - tree (*fn)(tree, machine_mode, bool); - - if (!targetm.addr_space.valid_pointer_mode (mode, as)) - { - error ("invalid pointer mode %qs", p); - return NULL_TREE; - } - - if (TREE_CODE (type) == POINTER_TYPE) - fn = build_pointer_type_for_mode; - else - fn = build_reference_type_for_mode; - typefm = fn (TREE_TYPE (type), mode, false); - } - else - { - /* For fixed-point modes, we need to test if the signness of type - and the machine mode are consistent. */ - if (ALL_FIXED_POINT_MODE_P (mode) - && TYPE_UNSIGNED (type) != UNSIGNED_FIXED_POINT_MODE_P (mode)) - { - error ("signedness of type and machine mode %qs don%'t match", p); - return NULL_TREE; - } - /* For fixed-point modes, we need to pass saturating info. */ - typefm = lang_hooks.types.type_for_mode (mode, - ALL_FIXED_POINT_MODE_P (mode) ? TYPE_SATURATING (type) - : TYPE_UNSIGNED (type)); - } - - if (typefm == NULL_TREE) - { - error ("no data type for mode %qs", p); - return NULL_TREE; - } - else if (TREE_CODE (type) == ENUMERAL_TYPE) - { - /* For enumeral types, copy the precision from the integer - type returned above. If not an INTEGER_TYPE, we can't use - this mode for this type. */ - if (TREE_CODE (typefm) != INTEGER_TYPE) - { - error ("cannot use mode %qs for enumeral types", p); - return NULL_TREE; - } - - if (flags & ATTR_FLAG_TYPE_IN_PLACE) - { - TYPE_PRECISION (type) = TYPE_PRECISION (typefm); - typefm = type; - } - else - { - /* We cannot build a type variant, as there's code that assumes - that TYPE_MAIN_VARIANT has the same mode. This includes the - debug generators. Instead, create a subrange type. This - results in all of the enumeral values being emitted only once - in the original, and the subtype gets them by reference. */ - if (TYPE_UNSIGNED (type)) - typefm = make_unsigned_type (TYPE_PRECISION (typefm)); - else - typefm = make_signed_type (TYPE_PRECISION (typefm)); - TREE_TYPE (typefm) = type; - } - } - else if (VECTOR_MODE_P (mode) - ? TREE_CODE (type) != TREE_CODE (TREE_TYPE (typefm)) - : TREE_CODE (type) != TREE_CODE (typefm)) - { - error ("mode %qs applied to inappropriate type", p); - return NULL_TREE; - } - - *node = typefm; - } - - 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; - } - - user_defined_section_attribute = true; - - 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; -} - -/* Check whether ALIGN is a valid user-specified alignment. If so, - return its base-2 log; if not, output an error and return -1. If - ALLOW_ZERO then 0 is valid and should result in a return of -1 with - no error. */ -int -check_user_alignment (const_tree align, bool allow_zero) -{ - int i; - - if (error_operand_p (align)) - return -1; - if (TREE_CODE (align) != INTEGER_CST - || !INTEGRAL_TYPE_P (TREE_TYPE (align))) - { - error ("requested alignment is not an integer constant"); - return -1; - } - else if (allow_zero && integer_zerop (align)) - return -1; - else if (tree_int_cst_sgn (align) == -1 - || (i = tree_log2 (align)) == -1) - { - error ("requested alignment is not a positive power of 2"); - return -1; - } - else if (i >= HOST_BITS_PER_INT - LOG2_BITS_PER_UNIT) - { - error ("requested alignment is too large"); - return -1; - } - return i; -} - -/* If in c++-11, check if the c++-11 alignment constraint with respect - to fundamental alignment (in [dcl.align]) are satisfied. If not in - c++-11 mode, does nothing. - - [dcl.align]2/ says: - - [* if the constant expression evaluates to a fundamental alignment, - the alignment requirement of the declared entity shall be the - specified fundamental alignment. - - * if the constant expression evaluates to an extended alignment - and the implementation supports that alignment in the context - of the declaration, the alignment of the declared entity shall - be that alignment - - * if the constant expression evaluates to an extended alignment - and the implementation does not support that alignment in the - context of the declaration, the program is ill-formed]. */ - -static bool -check_cxx_fundamental_alignment_constraints (tree node, - unsigned align_log, - int flags) -{ - bool alignment_too_large_p = false; - unsigned requested_alignment = (1U << align_log) * BITS_PER_UNIT; - unsigned max_align = 0; - - if ((!(flags & ATTR_FLAG_CXX11) && !warn_cxx_compat) - || (node == NULL_TREE || node == error_mark_node)) - return true; - - if (cxx_fundamental_alignment_p (requested_alignment)) - return true; - - if (VAR_P (node)) - { - if (TREE_STATIC (node) || DECL_EXTERNAL (node)) - /* For file scope variables and static members, the target supports - alignments that are at most MAX_OFILE_ALIGNMENT. */ - max_align = MAX_OFILE_ALIGNMENT; - else - /* For stack variables, the target supports at most - MAX_STACK_ALIGNMENT. */ - max_align = MAX_STACK_ALIGNMENT; - if (requested_alignment > max_align) - alignment_too_large_p = true; - } - /* Let's be liberal for types and fields; don't limit their alignment any - more than check_user_alignment already did. */ - - if (alignment_too_large_p) - pedwarn (input_location, OPT_Wattributes, - "requested alignment %d is larger than %d", - requested_alignment / BITS_PER_UNIT, max_align / BITS_PER_UNIT); - - return !alignment_too_large_p; -} - -/* Handle a "aligned" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_aligned_attribute (tree *node, tree ARG_UNUSED (name), tree args, - int flags, bool *no_add_attrs) -{ - tree decl = NULL_TREE; - tree *type = NULL; - int is_type = 0; - tree align_expr; - int i; - - if (args) - { - align_expr = TREE_VALUE (args); - if (align_expr && TREE_CODE (align_expr) != IDENTIFIER_NODE - && TREE_CODE (align_expr) != FUNCTION_DECL) - align_expr = default_conversion (align_expr); - } - else - align_expr = size_int (ATTRIBUTE_ALIGNED_VALUE / BITS_PER_UNIT); - - if (DECL_P (*node)) - { - decl = *node; - type = &TREE_TYPE (decl); - is_type = TREE_CODE (*node) == TYPE_DECL; - } - else if (TYPE_P (*node)) - type = node, is_type = 1; - - if ((i = check_user_alignment (align_expr, true)) == -1 - || !check_cxx_fundamental_alignment_constraints (*node, i, flags)) - *no_add_attrs = true; - else if (is_type) - { - if ((flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) - /* OK, modify the type in place. */; - /* If we have a TYPE_DECL, then copy the type, so that we - don't accidentally modify a builtin type. See pushdecl. */ - else if (decl && TREE_TYPE (decl) != error_mark_node - && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) - { - tree tt = TREE_TYPE (decl); - *type = build_variant_type_copy (*type); - DECL_ORIGINAL_TYPE (decl) = tt; - TYPE_NAME (*type) = decl; - TREE_USED (*type) = TREE_USED (decl); - TREE_TYPE (decl) = *type; - } - else - *type = build_variant_type_copy (*type); - - SET_TYPE_ALIGN (*type, (1U << i) * BITS_PER_UNIT); - TYPE_USER_ALIGN (*type) = 1; - } - else if (! VAR_OR_FUNCTION_DECL_P (decl) - && TREE_CODE (decl) != FIELD_DECL) - { - error ("alignment may not be specified for %q+D", decl); - *no_add_attrs = true; - } - else if (DECL_USER_ALIGN (decl) - && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) - /* C++-11 [dcl.align/4]: - - When multiple alignment-specifiers are specified for an - entity, the alignment requirement shall be set to the - strictest specified alignment. - - This formally comes from the c++11 specification but we are - doing it for the GNU attribute syntax as well. */ - *no_add_attrs = true; - else if (TREE_CODE (decl) == FUNCTION_DECL - && DECL_ALIGN (decl) > (1U << i) * BITS_PER_UNIT) - { - if (DECL_USER_ALIGN (decl)) - error ("alignment for %q+D was previously specified as %d " - "and may not be decreased", decl, - DECL_ALIGN (decl) / BITS_PER_UNIT); - else - error ("alignment for %q+D must be at least %d", decl, - DECL_ALIGN (decl) / BITS_PER_UNIT); - *no_add_attrs = true; - } - else - { - SET_DECL_ALIGN (decl, (1U << i) * BITS_PER_UNIT); - DECL_USER_ALIGN (decl) = 1; - } - - return NULL_TREE; -} - -/* Handle a "weak" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_weak_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool * ARG_UNUSED (no_add_attrs)) -{ - if (TREE_CODE (*node) == FUNCTION_DECL - && DECL_DECLARED_INLINE_P (*node)) - { - warning (OPT_Wattributes, "inline function %q+D declared weak", *node); - *no_add_attrs = true; - } - else if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) - { - error ("indirect function %q+D cannot be declared weak", *node); - *no_add_attrs = true; - return NULL_TREE; - } - else if (VAR_OR_FUNCTION_DECL_P (*node)) - declare_weak (*node); - else - warning (OPT_Wattributes, "%qE attribute ignored", name); - - return NULL_TREE; -} - -/* Handle a "noplt" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_noplt_attribute (tree *node, tree name, - tree ARG_UNUSED (args), - int ARG_UNUSED (flags), - bool * ARG_UNUSED (no_add_attrs)) -{ - if (TREE_CODE (*node) != FUNCTION_DECL) - { - warning (OPT_Wattributes, - "%qE attribute is only applicable on functions", name); - *no_add_attrs = true; - return NULL_TREE; - } - return NULL_TREE; -} - -/* Handle an "alias" or "ifunc" attribute; arguments as in - struct attribute_spec.handler, except that IS_ALIAS tells us - whether this is an alias as opposed to ifunc attribute. */ - -static tree -handle_alias_ifunc_attribute (bool is_alias, tree *node, tree name, tree args, - bool *no_add_attrs) -{ - tree decl = *node; - - if (TREE_CODE (decl) != FUNCTION_DECL - && (!is_alias || !VAR_P (decl))) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - else if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) - || (TREE_CODE (decl) != FUNCTION_DECL - && TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) - /* A static variable declaration is always a tentative definition, - but the alias is a non-tentative definition which overrides. */ - || (TREE_CODE (decl) != FUNCTION_DECL - && ! TREE_PUBLIC (decl) && DECL_INITIAL (decl))) - { - error ("%q+D defined both normally and as %qE attribute", decl, name); - *no_add_attrs = true; - return NULL_TREE; - } - else if (!is_alias - && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl)) - || lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))) - { - error ("weak %q+D cannot be defined %qE", decl, name); - *no_add_attrs = true; - return NULL_TREE; - } - - /* Note that the very first time we process a nested declaration, - decl_function_context will not be set. Indeed, *would* never - be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that - we do below. After such frobbery, pushdecl would set the context. - In any case, this is never what we want. */ - else if (decl_function_context (decl) == 0 && current_function_decl == NULL) - { - tree id; - - id = TREE_VALUE (args); - if (TREE_CODE (id) != STRING_CST) - { - error ("attribute %qE argument not a string", name); - *no_add_attrs = true; - return NULL_TREE; - } - id = get_identifier (TREE_STRING_POINTER (id)); - /* This counts as a use of the object pointed to. */ - TREE_USED (id) = 1; - - if (TREE_CODE (decl) == FUNCTION_DECL) - DECL_INITIAL (decl) = error_mark_node; - else - TREE_STATIC (decl) = 1; - - if (!is_alias) - /* ifuncs are also aliases, so set that attribute too. */ - DECL_ATTRIBUTES (decl) - = tree_cons (get_identifier ("alias"), args, DECL_ATTRIBUTES (decl)); - } - else - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - } - - if (decl_in_symtab_p (*node)) - { - struct symtab_node *n = symtab_node::get (decl); - if (n && n->refuse_visibility_changes) - { - if (is_alias) - error ("%+D declared alias after being used", decl); - else - error ("%+D declared ifunc after being used", decl); - } - } - - - return NULL_TREE; -} - -/* Handle an "alias" or "ifunc" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_ifunc_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - return handle_alias_ifunc_attribute (false, node, name, args, no_add_attrs); -} - -/* Handle an "alias" or "ifunc" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_alias_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), bool *no_add_attrs) -{ - return handle_alias_ifunc_attribute (true, node, name, args, no_add_attrs); -} - -/* Handle a "weakref" attribute; arguments as in struct - attribute_spec.handler. */ - -static tree -handle_weakref_attribute (tree *node, tree ARG_UNUSED (name), tree args, - int flags, bool *no_add_attrs) -{ - tree attr = NULL_TREE; - - /* We must ignore the attribute when it is associated with - local-scoped decls, since attribute alias is ignored and many - such symbols do not even have a DECL_WEAK field. */ - if (decl_function_context (*node) - || current_function_decl - || !VAR_OR_FUNCTION_DECL_P (*node)) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - *no_add_attrs = true; - return NULL_TREE; - } - - if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node))) - { - error ("indirect function %q+D cannot be declared weakref", *node); - *no_add_attrs = true; - return NULL_TREE; - } - - /* The idea here is that `weakref("name")' mutates into `weakref, - alias("name")', and weakref without arguments, in turn, - implicitly adds weak. */ - - if (args) - { - attr = tree_cons (get_identifier ("alias"), args, attr); - attr = tree_cons (get_identifier ("weakref"), NULL_TREE, attr); - - *no_add_attrs = true; - - decl_attributes (node, attr, flags); - } - else - { - if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node))) - error_at (DECL_SOURCE_LOCATION (*node), - "weakref attribute must appear before alias attribute"); - - /* Can't call declare_weak because it wants this to be TREE_PUBLIC, - and that isn't supported; and because it wants to add it to - the list of weak decls, which isn't helpful. */ - DECL_WEAK (*node) = 1; - } - - if (decl_in_symtab_p (*node)) - { - struct symtab_node *n = symtab_node::get (*node); - if (n && n->refuse_visibility_changes) - error ("%+D declared weakref after being used", *node); - } - - return NULL_TREE; -} - -/* Handle an "visibility" attribute; arguments as in - struct attribute_spec.handler. */ - -static tree -handle_visibility_attribute (tree *node, tree name, tree args, - int ARG_UNUSED (flags), - bool *ARG_UNUSED (no_add_attrs)) -{ - tree decl = *node; - tree id = TREE_VALUE (args); - enum symbol_visibility vis; - - if (TYPE_P (*node)) - { - if (TREE_CODE (*node) == ENUMERAL_TYPE) - /* OK */; - else if (!RECORD_OR_UNION_TYPE_P (*node)) - { - warning (OPT_Wattributes, "%qE attribute ignored on non-class types", - name); - return NULL_TREE; - } - else if (TYPE_FIELDS (*node)) - { - error ("%qE attribute ignored because %qT is already defined", - name, *node); - return NULL_TREE; - } - } - else if (decl_function_context (decl) != 0 || !TREE_PUBLIC (decl)) - { - warning (OPT_Wattributes, "%qE attribute ignored", name); - return NULL_TREE; - } - - if (TREE_CODE (id) != STRING_CST) - { - error ("visibility argument not a string"); - return NULL_TREE; - } - - /* If this is a type, set the visibility on the type decl. */ - if (TYPE_P (decl)) - { - decl = TYPE_NAME (decl); - if (!decl) - return NULL_TREE; - if (TREE_CODE (decl) == IDENTIFIER_NODE) - { - warning (OPT_Wattributes, "%qE attribute ignored on types", - name); - return NULL_TREE; - } - } - - if (strcmp (TREE_STRING_POINTER (id), "default") == 0) - vis = VISIBILITY_DEFAULT; - else if (strcmp (TREE_STRING_POINTER (id), "internal") == 0) - vis = VISIBILITY_INTERNAL; - else if (strcmp (TREE_STRING_POINTER (id), "hidden") == 0) - vis = VISIBILITY_HIDDEN; - else if (strcmp (TREE_STRING_POINTER (id), "protected") == 0) - vis = VISIBILITY_PROTECTED; - else - { - error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\""); - vis = VISIBILITY_DEFAULT; - } - - if (DECL_VISIBILITY_SPECIFIED (decl) - && vis != DECL_VISIBILITY (decl)) - { - tree attributes = (TYPE_P (*node) - ? TYPE_ATTRIBUTES (*node) - : DECL_ATTRIBUTES (decl)); - if (lookup_attribute ("visibility", attributes)) - error ("%qD redeclared with different visibility", decl); - else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES - && lookup_attribute ("dllimport", attributes)) - error ("%qD was declared %qs which implies default visibility", - decl, "dllimport"); - else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES - && lookup_attribute ("dllexport", attributes)) - error ("%qD was declared %qs which implies default visibility", - decl, "dllexport"); - } - - DECL_VISIBILITY (decl) = vis; - DECL_VISIBILITY_SPECIFIED (decl) = 1; - - /* Go ahead and attach the attribute to the node as well. This is needed - so we can determine whether we have VISIBILITY_DEFAULT because the - visibility was not specified, or because it was explicitly overridden - from the containing scope. */ - - return NULL_TREE; -} - -/* Determine the ELF symbol visibility for DECL, which is either a - variable or a function. It is an error to use this function if a - definition of DECL is not available in this translation unit. - Returns true if the final visibility has been determined by this - function; false if the caller is free to make additional - modifications. */ - -bool -c_determine_visibility (tree decl) -{ - gcc_assert (VAR_OR_FUNCTION_DECL_P (decl)); - - /* If the user explicitly specified the visibility with an - attribute, honor that. DECL_VISIBILITY will have been set during - the processing of the attribute. We check for an explicit - attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, - to distinguish the use of an attribute from the use of a "#pragma - GCC visibility push(...)"; in the latter case we still want other - considerations to be able to overrule the #pragma. */ - if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl)) - || (TARGET_DLLIMPORT_DECL_ATTRIBUTES - && (lookup_attribute ("dllimport", DECL_ATTRIBUTES (decl)) - || lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))))) - return true; - - /* Set default visibility to whatever the user supplied with - visibility_specified depending on #pragma GCC visibility. */ - if (!DECL_VISIBILITY_SPECIFIED (decl)) - { - if (visibility_options.inpragma - || DECL_VISIBILITY (decl) != default_visibility) - { - DECL_VISIBILITY (decl) = default_visibility; - DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma; - /* If visibility changed and DECL already has DECL_RTL, ensure - symbol flags are updated. */ - if (((VAR_P (decl) && TREE_STATIC (decl)) - || TREE_CODE (decl) == FUNCTION_DECL) - && DECL_RTL_SET_P (decl)) - make_decl_rtl (decl); - } - } - return false; -} - -/* 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 % and % 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), - "% 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) - 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; -} - -/* Check the argument list of a function call for null in argument slots - that are marked as requiring a non-null pointer argument. The NARGS - arguments are passed in the array ARGARRAY. */ - -static void -check_function_nonnull (location_t loc, tree attrs, int nargs, tree *argarray) -{ - tree a; - int i; - - attrs = lookup_attribute ("nonnull", attrs); - if (attrs == NULL_TREE) - return; - - a = attrs; - /* See if any of the nonnull attributes has no arguments. If so, - then every pointer argument is checked (in which case the check - for pointer type is done in check_nonnull_arg). */ - if (TREE_VALUE (a) != NULL_TREE) - do - a = lookup_attribute ("nonnull", TREE_CHAIN (a)); - while (a != NULL_TREE && TREE_VALUE (a) != NULL_TREE); - - if (a != NULL_TREE) - for (i = 0; i < nargs; i++) - check_function_arguments_recurse (check_nonnull_arg, &loc, argarray[i], - i + 1); - else - { - /* Walk the argument list. If we encounter an argument number we - should check for non-null, do it. */ - for (i = 0; i < nargs; i++) - { - for (a = attrs; ; a = TREE_CHAIN (a)) - { - a = lookup_attribute ("nonnull", a); - if (a == NULL_TREE || nonnull_check_p (TREE_VALUE (a), i + 1)) - break; - } - - if (a != NULL_TREE) - check_function_arguments_recurse (check_nonnull_arg, &loc, - argarray[i], i + 1); - } - } -} - -/* Check that the Nth argument of a function call (counting backwards - from the end) is a (pointer)0. The NARGS arguments are passed in the - array ARGARRAY. */ - -static void -check_function_sentinel (const_tree fntype, int nargs, tree *argarray) -{ - tree attr = lookup_attribute ("sentinel", TYPE_ATTRIBUTES (fntype)); - - if (attr) - { - int len = 0; - int pos = 0; - tree sentinel; - function_args_iterator iter; - tree t; - - /* Skip over the named arguments. */ - FOREACH_FUNCTION_ARGS (fntype, t, iter) - { - if (len == nargs) - break; - len++; - } - - if (TREE_VALUE (attr)) - { - tree p = TREE_VALUE (TREE_VALUE (attr)); - pos = TREE_INT_CST_LOW (p); - } - - /* The sentinel must be one of the varargs, i.e. - in position >= the number of fixed arguments. */ - if ((nargs - 1 - pos) < len) - { - warning (OPT_Wformat_, - "not enough variable arguments to fit a sentinel"); - return; - } - - /* Validate the sentinel. */ - sentinel = argarray[nargs - 1 - pos]; - if ((!POINTER_TYPE_P (TREE_TYPE (sentinel)) - || !integer_zerop (sentinel)) - /* Although __null (in C++) is only an integer we allow it - nevertheless, as we are guaranteed that it's exactly - as wide as a pointer, and we don't want to force - users to cast the NULL they have written there. - We warn with -Wstrict-null-sentinel, though. */ - && (warn_strict_null_sentinel || null_node != sentinel)) - warning (OPT_Wformat_, "missing sentinel in function call"); - } -} - -/* Helper for check_function_nonnull; given a list of operands which - must be non-null in ARGS, determine if operand PARAM_NUM should be - checked. */ - -static bool -nonnull_check_p (tree args, unsigned HOST_WIDE_INT param_num) -{ - unsigned HOST_WIDE_INT arg_num = 0; - - for (; args; args = TREE_CHAIN (args)) - { - bool found = get_nonnull_operand (TREE_VALUE (args), &arg_num); - - gcc_assert (found); - - if (arg_num == param_num) - return true; - } - return false; -} - -/* Check that the function argument PARAM (which is operand number - PARAM_NUM) is non-null. This is called by check_function_nonnull - via check_function_arguments_recurse. */ - -static void -check_nonnull_arg (void *ctx, tree param, unsigned HOST_WIDE_INT param_num) -{ - location_t *ploc = (location_t *) ctx; - - /* Just skip checking the argument if it's not a pointer. This can - happen if the "nonnull" attribute was given without an operand - list (which means to check every pointer argument). */ - - if (TREE_CODE (TREE_TYPE (param)) != POINTER_TYPE) - return; - - if (integer_zerop (param)) - warning_at (*ploc, OPT_Wnonnull, "null argument where non-null required " - "(argument %lu)", (unsigned long) param_num); -} - -/* Helper for nonnull attribute handling; fetch the operand number - from the attribute argument list. */ - -static bool -get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) -{ - /* Verify the arg number is a small constant. */ - if (tree_fits_uhwi_p (arg_num_expr)) - { - *valp = TREE_INT_CST_LOW (arg_num_expr); - return true; - } - else - return false; -} - -/* 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; - - 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; -} - -/* Arguments being collected for optimization. */ -typedef const char *const_char_p; /* For DEF_VEC_P. */ -static GTY(()) vec *optimize_args; +/* Arguments being collected for optimization. */ +typedef const char *const_char_p; /* For DEF_VEC_P. */ +static GTY(()) vec *optimize_args; /* Inner function to convert a TREE_LIST to argv string to parse the optimize @@ -8539,115 +5536,6 @@ parse_optimize_options (tree args, bool attr_p) return ret; } -/* 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 % 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; -} - /* Check whether ATTR is a valid attribute fallthrough. */ bool diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h index 8ef1d742eb7..bfdbda0898d 100644 --- a/gcc/c-family/c-common.h +++ b/gcc/c-family/c-common.h @@ -808,10 +808,8 @@ extern bool check_builtin_function_arguments (location_t, vec, tree, int, tree *); extern void check_function_format (tree, int, tree *); extern bool attribute_fallthrough_p (tree); -extern tree handle_unused_attribute (tree *, tree, tree, int, bool *); extern tree handle_format_attribute (tree *, tree, tree, int, bool *); extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *); -extern bool attribute_takes_identifier_p (const_tree); extern bool c_common_handle_option (size_t, const char *, int, int, location_t, const struct cl_option_handlers *); extern bool default_handle_c_option (size_t, const char *, int); @@ -857,6 +855,7 @@ extern bool pointer_to_zero_sized_aggr_p (tree); extern bool bool_promoted_to_int_p (tree); extern tree fold_for_warn (tree); extern tree c_common_get_narrower (tree, int *); +extern bool get_nonnull_operand (tree, unsigned HOST_WIDE_INT *); #define c_sizeof(LOC, T) c_sizeof_or_alignof_type (LOC, T, true, false, 1) #define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, false, 1) @@ -1315,8 +1314,6 @@ c_tree_chain_next (tree t) #define TM_STMT_ATTR_ATOMIC 4 #define TM_STMT_ATTR_RELAXED 8 -extern int parse_tm_stmt_attr (tree, int); - /* Mask used by tm_attr_to_mask and tm_mask_to_attr. Note that these are ordered specifically such that more restrictive attributes are at lower bit positions. This fact is known by the C++ tm attribute @@ -1328,10 +1325,6 @@ extern int parse_tm_stmt_attr (tree, int); #define TM_ATTR_IRREVOCABLE 8 #define TM_ATTR_MAY_CANCEL_OUTER 16 -extern int tm_attr_to_mask (tree); -extern tree tm_mask_to_attr (int); -extern tree find_tm_attribute (tree); - /* A suffix-identifier value doublet that represents user-defined literals for C++-0x. */ enum overflow_type { @@ -1538,6 +1531,14 @@ extern bool maybe_warn_shift_overflow (location_t, tree, tree); extern void warn_duplicated_cond_add_or_warn (location_t, tree, vec **); extern bool diagnose_mismatched_attributes (tree, tree); +/* In c-attribs.c. */ +extern bool attribute_takes_identifier_p (const_tree); +extern tree handle_unused_attribute (tree *, tree, tree, int, bool *); +extern int parse_tm_stmt_attr (tree, int); +extern int tm_attr_to_mask (tree); +extern tree tm_mask_to_attr (int); +extern tree find_tm_attribute (tree); + #if CHECKING_P namespace selftest { extern void c_format_c_tests (void); -- 2.30.2