1 /* Functions dealing with attribute handling, used by most front ends.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
36 static void init_attributes PARAMS ((void));
38 /* Table of the tables of attributes (common, format, language, machine)
40 static const struct attribute_spec *attribute_tables[4];
42 static bool attributes_initialized = false;
44 static tree handle_packed_attribute PARAMS ((tree *, tree, tree, int,
46 static tree handle_nocommon_attribute PARAMS ((tree *, tree, tree, int,
48 static tree handle_common_attribute PARAMS ((tree *, tree, tree, int,
50 static tree handle_noreturn_attribute PARAMS ((tree *, tree, tree, int,
52 static tree handle_noinline_attribute PARAMS ((tree *, tree, tree, int,
54 static tree handle_used_attribute PARAMS ((tree *, tree, tree, int,
56 static tree handle_unused_attribute PARAMS ((tree *, tree, tree, int,
58 static tree handle_const_attribute PARAMS ((tree *, tree, tree, int,
60 static tree handle_transparent_union_attribute PARAMS ((tree *, tree, tree,
62 static tree handle_constructor_attribute PARAMS ((tree *, tree, tree, int,
64 static tree handle_destructor_attribute PARAMS ((tree *, tree, tree, int,
66 static tree handle_mode_attribute PARAMS ((tree *, tree, tree, int,
68 static tree handle_section_attribute PARAMS ((tree *, tree, tree, int,
70 static tree handle_aligned_attribute PARAMS ((tree *, tree, tree, int,
72 static tree handle_weak_attribute PARAMS ((tree *, tree, tree, int,
74 static tree handle_alias_attribute PARAMS ((tree *, tree, tree, int,
76 static tree handle_no_instrument_function_attribute PARAMS ((tree *, tree,
79 static tree handle_no_check_memory_usage_attribute PARAMS ((tree *, tree, tree,
81 static tree handle_malloc_attribute PARAMS ((tree *, tree, tree, int,
83 static tree handle_no_limit_stack_attribute PARAMS ((tree *, tree, tree, int,
85 static tree handle_pure_attribute PARAMS ((tree *, tree, tree, int,
88 /* Table of machine-independent attributes common to all C-like languages. */
89 static const struct attribute_spec c_common_attribute_table[] =
91 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
92 { "packed", 0, 0, false, false, false,
93 handle_packed_attribute },
94 { "nocommon", 0, 0, true, false, false,
95 handle_nocommon_attribute },
96 { "common", 0, 0, true, false, false,
97 handle_common_attribute },
98 /* FIXME: logically, noreturn attributes should be listed as
99 "false, true, true" and apply to function types. But implementing this
100 would require all the places in the compiler that use TREE_THIS_VOLATILE
101 on a decl to identify non-returning functions to be located and fixed
102 to check the function type instead. */
103 { "noreturn", 0, 0, true, false, false,
104 handle_noreturn_attribute },
105 { "volatile", 0, 0, true, false, false,
106 handle_noreturn_attribute },
107 { "noinline", 0, 0, true, false, false,
108 handle_noinline_attribute },
109 { "used", 0, 0, true, false, false,
110 handle_used_attribute },
111 { "unused", 0, 0, false, false, false,
112 handle_unused_attribute },
113 /* The same comments as for noreturn attributes apply to const ones. */
114 { "const", 0, 0, true, false, false,
115 handle_const_attribute },
116 { "transparent_union", 0, 0, false, false, false,
117 handle_transparent_union_attribute },
118 { "constructor", 0, 0, true, false, false,
119 handle_constructor_attribute },
120 { "destructor", 0, 0, true, false, false,
121 handle_destructor_attribute },
122 { "mode", 1, 1, true, false, false,
123 handle_mode_attribute },
124 { "section", 1, 1, true, false, false,
125 handle_section_attribute },
126 { "aligned", 0, 1, false, false, false,
127 handle_aligned_attribute },
128 { "weak", 0, 0, true, false, false,
129 handle_weak_attribute },
130 { "alias", 1, 1, true, false, false,
131 handle_alias_attribute },
132 { "no_instrument_function", 0, 0, true, false, false,
133 handle_no_instrument_function_attribute },
134 { "no_check_memory_usage", 0, 0, true, false, false,
135 handle_no_check_memory_usage_attribute },
136 { "malloc", 0, 0, true, false, false,
137 handle_malloc_attribute },
138 { "no_stack_limit", 0, 0, true, false, false,
139 handle_no_limit_stack_attribute },
140 { "pure", 0, 0, true, false, false,
141 handle_pure_attribute },
142 { NULL, 0, 0, false, false, false, NULL }
145 /* Default empty table of attributes. */
146 static const struct attribute_spec empty_attribute_table[] =
148 { NULL, 0, 0, false, false, false, NULL }
151 /* Table of machine-independent attributes for checking formats, if used. */
152 const struct attribute_spec *format_attribute_table = empty_attribute_table;
154 /* Table of machine-independent attributes for a particular language. */
155 const struct attribute_spec *lang_attribute_table = empty_attribute_table;
157 /* Flag saying whether common language attributes are to be supported. */
158 int lang_attribute_common = 1;
160 /* Initialize attribute tables, and make some sanity checks
161 if --enable-checking. */
166 #ifdef ENABLE_CHECKING
171 = lang_attribute_common ? c_common_attribute_table : empty_attribute_table;
172 attribute_tables[1] = lang_attribute_table;
173 attribute_tables[2] = format_attribute_table;
174 attribute_tables[3] = targetm.attribute_table;
176 #ifdef ENABLE_CHECKING
177 /* Make some sanity checks on the attribute tables. */
179 i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0]));
184 for (j = 0; attribute_tables[i][j].name != NULL; j++)
186 /* The name must not begin and end with __. */
187 const char *name = attribute_tables[i][j].name;
188 int len = strlen (name);
189 if (name[0] == '_' && name[1] == '_'
190 && name[len - 1] == '_' && name[len - 2] == '_')
192 /* The minimum and maximum lengths must be consistent. */
193 if (attribute_tables[i][j].min_length < 0)
195 if (attribute_tables[i][j].max_length != -1
196 && (attribute_tables[i][j].max_length
197 < attribute_tables[i][j].min_length))
199 /* An attribute cannot require both a DECL and a TYPE. */
200 if (attribute_tables[i][j].decl_required
201 && attribute_tables[i][j].type_required)
203 /* If an attribute requires a function type, in particular
204 it requires a type. */
205 if (attribute_tables[i][j].function_type_required
206 && !attribute_tables[i][j].type_required)
211 /* Check that each name occurs just once in each table. */
213 i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0]));
217 for (j = 0; attribute_tables[i][j].name != NULL; j++)
218 for (k = j + 1; attribute_tables[i][k].name != NULL; k++)
219 if (!strcmp (attribute_tables[i][j].name,
220 attribute_tables[i][k].name))
223 /* Check that no name occurs in more than one table. */
225 i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0]));
231 j < ((int) (sizeof (attribute_tables)
232 / sizeof (attribute_tables[0])));
234 for (k = 0; attribute_tables[i][k].name != NULL; k++)
235 for (l = 0; attribute_tables[j][l].name != NULL; l++)
236 if (!strcmp (attribute_tables[i][k].name,
237 attribute_tables[j][l].name))
242 attributes_initialized = true;
245 /* Process the attributes listed in ATTRIBUTES and install them in *NODE,
246 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
247 it should be modified in place; if a TYPE, a copy should be created
248 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further
249 information, in the form of a bitwise OR of flags in enum attribute_flags
250 from tree.h. Depending on these flags, some attributes may be
251 returned to be applied at a later stage (for example, to apply
252 a decl attribute to the declaration rather than to its type). If
253 ATTR_FLAG_BUILT_IN is not set and *NODE is a DECL, then also consider
254 whether there might be some default attributes to apply to this DECL;
255 if so, decl_attributes will be called recusrively with those attributes
256 and ATTR_FLAG_BUILT_IN set. */
259 decl_attributes (node, attributes, flags)
260 tree *node, attributes;
264 tree returned_attrs = NULL_TREE;
266 if (!attributes_initialized)
269 (*targetm.insert_attributes) (*node, &attributes);
271 if (DECL_P (*node) && TREE_CODE (*node) == FUNCTION_DECL
272 && !(flags & (int) ATTR_FLAG_BUILT_IN))
273 insert_default_attributes (*node);
275 for (a = attributes; a; a = TREE_CHAIN (a))
277 tree name = TREE_PURPOSE (a);
278 tree args = TREE_VALUE (a);
280 const struct attribute_spec *spec = NULL;
281 bool no_add_attrs = 0;
285 i < ((int) (sizeof (attribute_tables)
286 / sizeof (attribute_tables[0])));
291 for (j = 0; attribute_tables[i][j].name != NULL; j++)
293 if (is_attribute_p (attribute_tables[i][j].name, name))
295 spec = &attribute_tables[i][j];
305 warning ("`%s' attribute directive ignored",
306 IDENTIFIER_POINTER (name));
309 else if (list_length (args) < spec->min_length
310 || (spec->max_length >= 0
311 && list_length (args) > spec->max_length))
313 error ("wrong number of arguments specified for `%s' attribute",
314 IDENTIFIER_POINTER (name));
318 if (spec->decl_required && !DECL_P (*anode))
320 if (flags & ((int) ATTR_FLAG_DECL_NEXT
321 | (int) ATTR_FLAG_FUNCTION_NEXT
322 | (int) ATTR_FLAG_ARRAY_NEXT))
324 /* Pass on this attribute to be tried again. */
325 returned_attrs = tree_cons (name, args, returned_attrs);
330 warning ("`%s' attribute does not apply to types",
331 IDENTIFIER_POINTER (name));
336 if (spec->type_required && DECL_P (*anode))
337 anode = &TREE_TYPE (*anode);
339 if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE
340 && TREE_CODE (*anode) != METHOD_TYPE)
342 if (TREE_CODE (*anode) == POINTER_TYPE
343 && (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE
344 || TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE))
346 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
347 *anode = build_type_copy (*anode);
348 anode = &TREE_TYPE (*anode);
350 else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT)
352 /* Pass on this attribute to be tried again. */
353 returned_attrs = tree_cons (name, args, returned_attrs);
357 if (TREE_CODE (*anode) != FUNCTION_TYPE
358 && TREE_CODE (*anode) != METHOD_TYPE)
360 warning ("`%s' attribute only applies to function types",
361 IDENTIFIER_POINTER (name));
366 if (spec->handler != NULL)
367 returned_attrs = chainon ((*spec->handler) (anode, name, args,
368 flags, &no_add_attrs),
376 old_attrs = DECL_ATTRIBUTES (*anode);
378 old_attrs = TYPE_ATTRIBUTES (*anode);
380 for (a = lookup_attribute (spec->name, old_attrs);
382 a = lookup_attribute (spec->name, TREE_CHAIN (a)))
384 if (simple_cst_equal (TREE_VALUE (a), args) == 1)
390 /* This attribute isn't already in the list. */
392 DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
393 else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE)
394 TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
396 *anode = build_type_attribute_variant (*anode,
397 tree_cons (name, args,
403 return returned_attrs;
406 /* Handle a "packed" attribute; arguments as in
407 struct attribute_spec.handler. */
410 handle_packed_attribute (node, name, args, flags, no_add_attrs)
413 tree args ATTRIBUTE_UNUSED;
420 if (TREE_CODE (*node) == TYPE_DECL)
421 type = &TREE_TYPE (*node);
428 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
429 *type = build_type_copy (*type);
430 TYPE_PACKED (*type) = 1;
432 else if (TREE_CODE (*node) == FIELD_DECL)
433 DECL_PACKED (*node) = 1;
434 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
435 used for DECL_REGISTER. It wouldn't mean anything anyway. */
438 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
439 *no_add_attrs = true;
445 /* Handle a "nocommon" attribute; arguments as in
446 struct attribute_spec.handler. */
449 handle_nocommon_attribute (node, name, args, flags, no_add_attrs)
452 tree args ATTRIBUTE_UNUSED;
453 int flags ATTRIBUTE_UNUSED;
456 if (TREE_CODE (*node) == VAR_DECL)
457 DECL_COMMON (*node) = 0;
460 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
461 *no_add_attrs = true;
467 /* Handle a "common" attribute; arguments as in
468 struct attribute_spec.handler. */
471 handle_common_attribute (node, name, args, flags, no_add_attrs)
474 tree args ATTRIBUTE_UNUSED;
475 int flags ATTRIBUTE_UNUSED;
478 if (TREE_CODE (*node) == VAR_DECL)
479 DECL_COMMON (*node) = 1;
482 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
483 *no_add_attrs = true;
489 /* Handle a "noreturn" attribute; arguments as in
490 struct attribute_spec.handler. */
493 handle_noreturn_attribute (node, name, args, flags, no_add_attrs)
496 tree args ATTRIBUTE_UNUSED;
497 int flags ATTRIBUTE_UNUSED;
500 tree type = TREE_TYPE (*node);
502 /* See FIXME comment in c_common_attribute_table. */
503 if (TREE_CODE (*node) == FUNCTION_DECL)
504 TREE_THIS_VOLATILE (*node) = 1;
505 else if (TREE_CODE (type) == POINTER_TYPE
506 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
509 (build_type_variant (TREE_TYPE (type),
510 TREE_READONLY (TREE_TYPE (type)), 1));
513 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
514 *no_add_attrs = true;
520 /* Handle a "noinline" attribute; arguments as in
521 struct attribute_spec.handler. */
524 handle_noinline_attribute (node, name, args, flags, no_add_attrs)
527 tree args ATTRIBUTE_UNUSED;
528 int flags ATTRIBUTE_UNUSED;
531 if (TREE_CODE (*node) == FUNCTION_DECL)
532 DECL_UNINLINABLE (*node) = 1;
535 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
536 *no_add_attrs = true;
542 /* Handle a "used" attribute; arguments as in
543 struct attribute_spec.handler. */
546 handle_used_attribute (node, name, args, flags, no_add_attrs)
549 tree args ATTRIBUTE_UNUSED;
550 int flags ATTRIBUTE_UNUSED;
553 if (TREE_CODE (*node) == FUNCTION_DECL)
554 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (*node))
555 = TREE_USED (*node) = 1;
558 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
559 *no_add_attrs = true;
565 /* Handle a "unused" attribute; arguments as in
566 struct attribute_spec.handler. */
569 handle_unused_attribute (node, name, args, flags, no_add_attrs)
572 tree args ATTRIBUTE_UNUSED;
580 if (TREE_CODE (decl) == PARM_DECL
581 || TREE_CODE (decl) == VAR_DECL
582 || TREE_CODE (decl) == FUNCTION_DECL
583 || TREE_CODE (decl) == LABEL_DECL
584 || TREE_CODE (decl) == TYPE_DECL)
585 TREE_USED (decl) = 1;
588 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
589 *no_add_attrs = true;
594 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
595 *node = build_type_copy (*node);
596 TREE_USED (*node) = 1;
602 /* Handle a "const" attribute; arguments as in
603 struct attribute_spec.handler. */
606 handle_const_attribute (node, name, args, flags, no_add_attrs)
609 tree args ATTRIBUTE_UNUSED;
610 int flags ATTRIBUTE_UNUSED;
613 tree type = TREE_TYPE (*node);
615 /* See FIXME comment on noreturn in c_common_attribute_table. */
616 if (TREE_CODE (*node) == FUNCTION_DECL)
617 TREE_READONLY (*node) = 1;
618 else if (TREE_CODE (type) == POINTER_TYPE
619 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
622 (build_type_variant (TREE_TYPE (type), 1,
623 TREE_THIS_VOLATILE (TREE_TYPE (type))));
626 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
627 *no_add_attrs = true;
633 /* Handle a "transparent_union" attribute; arguments as in
634 struct attribute_spec.handler. */
637 handle_transparent_union_attribute (node, name, args, flags, no_add_attrs)
640 tree args ATTRIBUTE_UNUSED;
644 tree decl = NULL_TREE;
651 type = &TREE_TYPE (decl);
652 is_type = TREE_CODE (*node) == TYPE_DECL;
654 else if (TYPE_P (*node))
655 type = node, is_type = 1;
658 && TREE_CODE (*type) == UNION_TYPE
660 || (TYPE_FIELDS (*type) != 0
661 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))))
663 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
664 *type = build_type_copy (*type);
665 TYPE_TRANSPARENT_UNION (*type) = 1;
667 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
668 && TREE_CODE (*type) == UNION_TYPE
669 && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type)))
670 DECL_TRANSPARENT_UNION (decl) = 1;
673 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
674 *no_add_attrs = true;
680 /* Handle a "constructor" attribute; arguments as in
681 struct attribute_spec.handler. */
684 handle_constructor_attribute (node, name, args, flags, no_add_attrs)
687 tree args ATTRIBUTE_UNUSED;
688 int flags ATTRIBUTE_UNUSED;
692 tree type = TREE_TYPE (decl);
694 if (TREE_CODE (decl) == FUNCTION_DECL
695 && TREE_CODE (type) == FUNCTION_TYPE
696 && decl_function_context (decl) == 0)
698 DECL_STATIC_CONSTRUCTOR (decl) = 1;
699 TREE_USED (decl) = 1;
703 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
704 *no_add_attrs = true;
710 /* Handle a "destructor" attribute; arguments as in
711 struct attribute_spec.handler. */
714 handle_destructor_attribute (node, name, args, flags, no_add_attrs)
717 tree args ATTRIBUTE_UNUSED;
718 int flags ATTRIBUTE_UNUSED;
722 tree type = TREE_TYPE (decl);
724 if (TREE_CODE (decl) == FUNCTION_DECL
725 && TREE_CODE (type) == FUNCTION_TYPE
726 && decl_function_context (decl) == 0)
728 DECL_STATIC_DESTRUCTOR (decl) = 1;
729 TREE_USED (decl) = 1;
733 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
734 *no_add_attrs = true;
740 /* Handle a "mode" attribute; arguments as in
741 struct attribute_spec.handler. */
744 handle_mode_attribute (node, name, args, flags, no_add_attrs)
748 int flags ATTRIBUTE_UNUSED;
752 tree type = TREE_TYPE (decl);
754 *no_add_attrs = true;
756 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
757 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
761 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
762 int len = strlen (p);
763 enum machine_mode mode = VOIDmode;
766 if (len > 4 && p[0] == '_' && p[1] == '_'
767 && p[len - 1] == '_' && p[len - 2] == '_')
769 char *newp = (char *) alloca (len - 1);
771 strcpy (newp, &p[2]);
772 newp[len - 4] = '\0';
776 /* Give this decl a type with the specified mode.
777 First check for the special modes. */
778 if (! strcmp (p, "byte"))
780 else if (!strcmp (p, "word"))
782 else if (! strcmp (p, "pointer"))
785 for (j = 0; j < NUM_MACHINE_MODES; j++)
786 if (!strcmp (p, GET_MODE_NAME (j)))
787 mode = (enum machine_mode) j;
789 if (mode == VOIDmode)
790 error ("unknown machine mode `%s'", p);
791 else if (0 == (typefm = type_for_mode (mode,
792 TREE_UNSIGNED (type))))
793 error ("no data type for mode `%s'", p);
796 TREE_TYPE (decl) = type = typefm;
797 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
798 if (TREE_CODE (decl) != FIELD_DECL)
799 layout_decl (decl, 0);
806 /* Handle a "section" attribute; arguments as in
807 struct attribute_spec.handler. */
810 handle_section_attribute (node, name, args, flags, no_add_attrs)
812 tree name ATTRIBUTE_UNUSED;
814 int flags ATTRIBUTE_UNUSED;
819 if (targetm.have_named_sections)
821 if ((TREE_CODE (decl) == FUNCTION_DECL
822 || TREE_CODE (decl) == VAR_DECL)
823 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
825 if (TREE_CODE (decl) == VAR_DECL
826 && current_function_decl != NULL_TREE
827 && ! TREE_STATIC (decl))
829 error_with_decl (decl,
830 "section attribute cannot be specified for local variables");
831 *no_add_attrs = true;
834 /* The decl may have already been given a section attribute
835 from a previous declaration. Ensure they match. */
836 else if (DECL_SECTION_NAME (decl) != NULL_TREE
837 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
838 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
840 error_with_decl (*node,
841 "section of `%s' conflicts with previous declaration");
842 *no_add_attrs = true;
845 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
849 error_with_decl (*node,
850 "section attribute not allowed for `%s'");
851 *no_add_attrs = true;
856 error_with_decl (*node,
857 "section attributes are not supported for this target");
858 *no_add_attrs = true;
864 /* Handle a "aligned" attribute; arguments as in
865 struct attribute_spec.handler. */
868 handle_aligned_attribute (node, name, args, flags, no_add_attrs)
870 tree name ATTRIBUTE_UNUSED;
875 tree decl = NULL_TREE;
878 tree align_expr = (args ? TREE_VALUE (args)
879 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
885 type = &TREE_TYPE (decl);
886 is_type = TREE_CODE (*node) == TYPE_DECL;
888 else if (TYPE_P (*node))
889 type = node, is_type = 1;
891 /* Strip any NOPs of any kind. */
892 while (TREE_CODE (align_expr) == NOP_EXPR
893 || TREE_CODE (align_expr) == CONVERT_EXPR
894 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
895 align_expr = TREE_OPERAND (align_expr, 0);
897 if (TREE_CODE (align_expr) != INTEGER_CST)
899 error ("requested alignment is not a constant");
900 *no_add_attrs = true;
902 else if ((i = tree_log2 (align_expr)) == -1)
904 error ("requested alignment is not a power of 2");
905 *no_add_attrs = true;
907 else if (i > HOST_BITS_PER_INT - 2)
909 error ("requested alignment is too large");
910 *no_add_attrs = true;
914 /* If we have a TYPE_DECL, then copy the type, so that we
915 don't accidentally modify a builtin type. See pushdecl. */
916 if (decl && TREE_TYPE (decl) != error_mark_node
917 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
919 tree tt = TREE_TYPE (decl);
920 *type = build_type_copy (*type);
921 DECL_ORIGINAL_TYPE (decl) = tt;
922 TYPE_NAME (*type) = decl;
923 TREE_USED (*type) = TREE_USED (decl);
924 TREE_TYPE (decl) = *type;
926 else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
927 *type = build_type_copy (*type);
929 TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT;
930 TYPE_USER_ALIGN (*type) = 1;
932 else if (TREE_CODE (decl) != VAR_DECL
933 && TREE_CODE (decl) != FIELD_DECL)
935 error_with_decl (decl,
936 "alignment may not be specified for `%s'");
937 *no_add_attrs = true;
941 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
942 DECL_USER_ALIGN (decl) = 1;
948 /* Handle a "weak" attribute; arguments as in
949 struct attribute_spec.handler. */
952 handle_weak_attribute (node, name, args, flags, no_add_attrs)
954 tree name ATTRIBUTE_UNUSED;
955 tree args ATTRIBUTE_UNUSED;
956 int flags ATTRIBUTE_UNUSED;
957 bool *no_add_attrs ATTRIBUTE_UNUSED;
959 declare_weak (*node);
964 /* Handle an "alias" attribute; arguments as in
965 struct attribute_spec.handler. */
968 handle_alias_attribute (node, name, args, flags, no_add_attrs)
972 int flags ATTRIBUTE_UNUSED;
977 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
978 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
980 error_with_decl (decl,
981 "`%s' defined both normally and as an alias");
982 *no_add_attrs = true;
984 else if (decl_function_context (decl) == 0)
988 id = TREE_VALUE (args);
989 if (TREE_CODE (id) != STRING_CST)
991 error ("alias arg not a string");
992 *no_add_attrs = true;
995 id = get_identifier (TREE_STRING_POINTER (id));
996 /* This counts as a use of the object pointed to. */
999 if (TREE_CODE (decl) == FUNCTION_DECL)
1000 DECL_INITIAL (decl) = error_mark_node;
1002 DECL_EXTERNAL (decl) = 0;
1003 assemble_alias (decl, id);
1007 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1008 *no_add_attrs = true;
1014 /* Handle a "no_instrument_function" attribute; arguments as in
1015 struct attribute_spec.handler. */
1018 handle_no_instrument_function_attribute (node, name, args, flags, no_add_attrs)
1021 tree args ATTRIBUTE_UNUSED;
1022 int flags ATTRIBUTE_UNUSED;
1027 if (TREE_CODE (decl) != FUNCTION_DECL)
1029 error_with_decl (decl,
1030 "`%s' attribute applies only to functions",
1031 IDENTIFIER_POINTER (name));
1032 *no_add_attrs = true;
1034 else if (DECL_INITIAL (decl))
1036 error_with_decl (decl,
1037 "can't set `%s' attribute after definition",
1038 IDENTIFIER_POINTER (name));
1039 *no_add_attrs = true;
1042 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1047 /* Handle a "no_check_memory_usage" attribute; arguments as in
1048 struct attribute_spec.handler. */
1051 handle_no_check_memory_usage_attribute (node, name, args, flags, no_add_attrs)
1054 tree args ATTRIBUTE_UNUSED;
1055 int flags ATTRIBUTE_UNUSED;
1060 if (TREE_CODE (decl) != FUNCTION_DECL)
1062 error_with_decl (decl,
1063 "`%s' attribute applies only to functions",
1064 IDENTIFIER_POINTER (name));
1065 *no_add_attrs = true;
1067 else if (DECL_INITIAL (decl))
1069 error_with_decl (decl,
1070 "can't set `%s' attribute after definition",
1071 IDENTIFIER_POINTER (name));
1072 *no_add_attrs = true;
1075 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1080 /* Handle a "malloc" attribute; arguments as in
1081 struct attribute_spec.handler. */
1084 handle_malloc_attribute (node, name, args, flags, no_add_attrs)
1087 tree args ATTRIBUTE_UNUSED;
1088 int flags ATTRIBUTE_UNUSED;
1091 if (TREE_CODE (*node) == FUNCTION_DECL)
1092 DECL_IS_MALLOC (*node) = 1;
1093 /* ??? TODO: Support types. */
1096 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1097 *no_add_attrs = true;
1103 /* Handle a "no_limit_stack" attribute; arguments as in
1104 struct attribute_spec.handler. */
1107 handle_no_limit_stack_attribute (node, name, args, flags, no_add_attrs)
1110 tree args ATTRIBUTE_UNUSED;
1111 int flags ATTRIBUTE_UNUSED;
1116 if (TREE_CODE (decl) != FUNCTION_DECL)
1118 error_with_decl (decl,
1119 "`%s' attribute applies only to functions",
1120 IDENTIFIER_POINTER (name));
1121 *no_add_attrs = true;
1123 else if (DECL_INITIAL (decl))
1125 error_with_decl (decl,
1126 "can't set `%s' attribute after definition",
1127 IDENTIFIER_POINTER (name));
1128 *no_add_attrs = true;
1131 DECL_NO_LIMIT_STACK (decl) = 1;
1136 /* Handle a "pure" attribute; arguments as in
1137 struct attribute_spec.handler. */
1140 handle_pure_attribute (node, name, args, flags, no_add_attrs)
1143 tree args ATTRIBUTE_UNUSED;
1144 int flags ATTRIBUTE_UNUSED;
1147 if (TREE_CODE (*node) == FUNCTION_DECL)
1148 DECL_IS_PURE (*node) = 1;
1149 /* ??? TODO: Support types. */
1152 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1153 *no_add_attrs = true;
1159 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1160 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1162 The head of the declspec list is stored in DECLSPECS.
1163 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1165 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1166 the list elements. We drop the containing TREE_LIST nodes and link the
1167 resulting attributes together the way decl_attributes expects them. */
1170 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1172 tree *declspecs, *prefix_attributes;
1174 tree t, s, a, next, specs, attrs;
1176 /* This can happen after an __extension__ in pedantic mode. */
1177 if (specs_attrs != NULL_TREE
1178 && TREE_CODE (specs_attrs) == INTEGER_CST)
1180 *declspecs = NULL_TREE;
1181 *prefix_attributes = NULL_TREE;
1185 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1186 if (specs_attrs != NULL_TREE
1187 && TREE_CODE (specs_attrs) != TREE_LIST)
1189 *declspecs = specs_attrs;
1190 *prefix_attributes = NULL_TREE;
1194 /* Remember to keep the lists in the same order, element-wise. */
1196 specs = s = NULL_TREE;
1197 attrs = a = NULL_TREE;
1198 for (t = specs_attrs; t; t = next)
1200 next = TREE_CHAIN (t);
1201 /* Declspecs have a non-NULL TREE_VALUE. */
1202 if (TREE_VALUE (t) != NULL_TREE)
1204 if (specs == NULL_TREE)
1212 /* The TREE_PURPOSE may also be empty in the case of
1213 __attribute__(()). */
1214 else if (TREE_PURPOSE (t) != NULL_TREE)
1216 if (attrs == NULL_TREE)
1217 attrs = a = TREE_PURPOSE (t);
1220 TREE_CHAIN (a) = TREE_PURPOSE (t);
1221 a = TREE_PURPOSE (t);
1223 /* More attrs can be linked here, move A to the end. */
1224 while (TREE_CHAIN (a) != NULL_TREE)
1229 /* Terminate the lists. */
1231 TREE_CHAIN (s) = NULL_TREE;
1233 TREE_CHAIN (a) = NULL_TREE;
1237 *prefix_attributes = attrs;
1240 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1241 This function is used by the parser when a rule will accept attributes
1242 in a particular position, but we don't want to support that just yet.
1244 A warning is issued for every ignored attribute. */
1247 strip_attrs (specs_attrs)
1252 split_specs_attrs (specs_attrs, &specs, &attrs);
1256 warning ("`%s' attribute ignored",
1257 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1258 attrs = TREE_CHAIN (attrs);