1 /* Subroutines shared by all languages that are variants of C.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
41 #undef WCHAR_TYPE_SIZE
42 #define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
44 /* The following symbols are subsumed in the c_global_trees array, and
45 listed here individually for documentation purposes.
47 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
49 tree short_integer_type_node;
50 tree long_integer_type_node;
51 tree long_long_integer_type_node;
53 tree short_unsigned_type_node;
54 tree long_unsigned_type_node;
55 tree long_long_unsigned_type_node;
57 tree boolean_type_node;
58 tree boolean_false_node;
59 tree boolean_true_node;
61 tree ptrdiff_type_node;
63 tree unsigned_char_type_node;
64 tree signed_char_type_node;
66 tree signed_wchar_type_node;
67 tree unsigned_wchar_type_node;
70 tree double_type_node;
71 tree long_double_type_node;
73 tree complex_integer_type_node;
74 tree complex_float_type_node;
75 tree complex_double_type_node;
76 tree complex_long_double_type_node;
84 tree unsigned_intQI_type_node;
85 tree unsigned_intHI_type_node;
86 tree unsigned_intSI_type_node;
87 tree unsigned_intDI_type_node;
88 tree unsigned_intTI_type_node;
90 tree widest_integer_literal_type_node;
91 tree widest_unsigned_literal_type_node;
93 Nodes for types `void *' and `const void *'.
95 tree ptr_type_node, const_ptr_type_node;
97 Nodes for types `char *' and `const char *'.
99 tree string_type_node, const_string_type_node;
101 Type `char[SOMENUMBER]'.
102 Used when an array of char is needed and the size is irrelevant.
104 tree char_array_type_node;
106 Type `int[SOMENUMBER]' or something like it.
107 Used when an array of int needed and the size is irrelevant.
109 tree int_array_type_node;
111 Type `wchar_t[SOMENUMBER]' or something like it.
112 Used when a wide string literal is created.
114 tree wchar_array_type_node;
116 Type `int ()' -- used for implicit declaration of functions.
118 tree default_function_type;
120 Function types `int (int)', etc.
126 tree ptr_ftype_sizetype;
128 A VOID_TYPE node, packaged in a TREE_LIST.
132 The identifiers __FUNCTION__, __PRETTY_FUNCTION__, and __func__.
134 tree function_id_node;
135 tree pretty_function_id_node;
140 tree c_global_trees[CTI_MAX];
142 /* The elements of `ridpointers' are identifier nodes for the reserved
143 type names and storage classes. It is indexed by a RID_... value. */
146 tree (*make_fname_decl) PARAMS ((tree, const char *, int));
148 /* If non-NULL, the address of a language-specific function that
149 returns 1 for language-specific statement codes. */
150 int (*lang_statement_code_p) PARAMS ((enum tree_code));
152 /* If non-NULL, the address of a language-specific function that takes
153 any action required right before expand_function_end is called. */
154 void (*lang_expand_function_end) PARAMS ((void));
156 /* Nonzero means the expression being parsed will never be evaluated.
157 This is a count, since unevaluated expressions can nest. */
160 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
161 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
162 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
163 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
164 A_NO_LIMIT_STACK, A_PURE};
166 enum format_type { printf_format_type, scanf_format_type,
167 strftime_format_type };
169 static void add_attribute PARAMS ((enum attrs, const char *,
171 static void init_attributes PARAMS ((void));
172 static void record_function_format PARAMS ((tree, tree, enum format_type,
174 static void record_international_format PARAMS ((tree, tree, int));
175 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
177 /* Keep a stack of if statements. We record the number of compound
178 statements seen up to the if keyword, as well as the line number
179 and file of the if. If a potentially ambiguous else is seen, that
180 fact is recorded; the warning is issued when we can be sure that
181 the enclosing if statement does not have an else branch. */
190 static void tfaff PARAMS ((void));
192 static if_elt *if_stack;
194 /* Amount of space in the if statement stack. */
195 static int if_stack_space = 0;
198 static int if_stack_pointer = 0;
200 /* Record the start of an if-then, and record the start of it
201 for ambiguous else detection. */
204 c_expand_start_cond (cond, compstmt_count)
210 /* Make sure there is enough space on the stack. */
211 if (if_stack_space == 0)
214 if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
216 else if (if_stack_space == if_stack_pointer)
218 if_stack_space += 10;
219 if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
222 if_stmt = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE);
223 IF_COND (if_stmt) = cond;
226 /* Record this if statement. */
227 if_stack[if_stack_pointer].compstmt_count = compstmt_count;
228 if_stack[if_stack_pointer].file = input_filename;
229 if_stack[if_stack_pointer].line = lineno;
230 if_stack[if_stack_pointer].needs_warning = 0;
231 if_stack[if_stack_pointer].if_stmt = if_stmt;
235 /* Called after the then-clause for an if-statement is processed. */
240 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
241 RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt));
244 /* Record the end of an if-then. Optionally warn if a nested
245 if statement had an ambiguous else clause. */
251 if (if_stack[if_stack_pointer].needs_warning)
252 warning_with_file_and_line (if_stack[if_stack_pointer].file,
253 if_stack[if_stack_pointer].line,
254 "suggest explicit braces to avoid ambiguous `else'");
255 last_expr_type = NULL_TREE;
258 /* Called between the then-clause and the else-clause
259 of an if-then-else. */
262 c_expand_start_else ()
264 /* An ambiguous else warning must be generated for the enclosing if
265 statement, unless we see an else branch for that one, too. */
267 && if_stack_pointer > 1
268 && (if_stack[if_stack_pointer - 1].compstmt_count
269 == if_stack[if_stack_pointer - 2].compstmt_count))
270 if_stack[if_stack_pointer - 2].needs_warning = 1;
272 /* Even if a nested if statement had an else branch, it can't be
273 ambiguous if this one also has an else. So don't warn in that
274 case. Also don't warn for any if statements nested in this else. */
275 if_stack[if_stack_pointer - 1].needs_warning = 0;
276 if_stack[if_stack_pointer - 1].compstmt_count--;
279 /* Called after the else-clause for an if-statement is processed. */
284 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
285 RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt));
288 /* Make bindings for __FUNCTION__, __PRETTY_FUNCTION__, and __func__. */
291 declare_function_name ()
293 const char *name, *printable_name;
295 if (current_function_decl == NULL)
298 printable_name = "top level";
302 /* Allow functions to be nameless (such as artificial ones). */
303 if (DECL_NAME (current_function_decl))
304 name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
307 printable_name = (*decl_printable_name) (current_function_decl, 2);
309 /* ISO C99 defines __func__, which is a variable, not a string
310 constant, and which is not a defined symbol at file scope. */
311 (*make_fname_decl) (func_id_node, name, 0);
314 (*make_fname_decl) (function_id_node, name, 0);
315 (*make_fname_decl) (pretty_function_id_node, printable_name, 1);
318 /* Given a chain of STRING_CST nodes,
319 concatenate them into one STRING_CST
320 and give it a suitable array-of-chars data type. */
323 combine_strings (strings)
326 register tree value, t;
327 register int length = 1;
330 int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
332 const int nchars_max = flag_isoc99 ? 4095 : 509;
334 if (TREE_CHAIN (strings))
336 /* More than one in the chain, so concatenate. */
337 register char *p, *q;
339 /* Don't include the \0 at the end of each substring,
340 except for the last one.
341 Count wide strings and ordinary strings separately. */
342 for (t = strings; t; t = TREE_CHAIN (t))
344 if (TREE_TYPE (t) == wchar_array_type_node)
346 wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
350 length += (TREE_STRING_LENGTH (t) - 1);
353 /* If anything is wide, the non-wides will be converted,
354 which makes them take more space. */
356 length = length * wchar_bytes + wide_length;
358 p = ggc_alloc_string (NULL, length);
360 /* Copy the individual strings into the new combined string.
361 If the combined string is wide, convert the chars to ints
362 for any individual strings that are not wide. */
365 for (t = strings; t; t = TREE_CHAIN (t))
367 int len = (TREE_STRING_LENGTH (t)
368 - ((TREE_TYPE (t) == wchar_array_type_node)
370 if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
372 memcpy (q, TREE_STRING_POINTER (t), len);
378 for (i = 0; i < len; i++)
380 if (WCHAR_TYPE_SIZE == HOST_BITS_PER_SHORT)
381 ((short *) q)[i] = TREE_STRING_POINTER (t)[i];
383 ((int *) q)[i] = TREE_STRING_POINTER (t)[i];
385 q += len * wchar_bytes;
391 for (i = 0; i < wchar_bytes; i++)
397 value = make_node (STRING_CST);
398 TREE_STRING_POINTER (value) = p;
399 TREE_STRING_LENGTH (value) = length;
404 length = TREE_STRING_LENGTH (value);
405 if (TREE_TYPE (value) == wchar_array_type_node)
409 /* Compute the number of elements, for the array type. */
410 nchars = wide_flag ? length / wchar_bytes : length;
412 if (pedantic && nchars > nchars_max)
413 pedwarn ("string length `%d' is greater than the minimum length `%d' ISO C%d is required to support",
414 nchars, nchars_max, flag_isoc99 ? 99 : 89);
416 /* Create the array type for the string constant.
417 -Wwrite-strings says make the string constant an array of const char
418 so that copying it to a non-const pointer will get a warning.
419 For C++, this is the standard behavior. */
420 if (flag_const_strings
421 && (! flag_traditional && ! flag_writable_strings))
424 = build_type_variant (wide_flag ? wchar_type_node : char_type_node,
427 = build_array_type (elements,
428 build_index_type (build_int_2 (nchars - 1, 0)));
432 = build_array_type (wide_flag ? wchar_type_node : char_type_node,
433 build_index_type (build_int_2 (nchars - 1, 0)));
435 TREE_CONSTANT (value) = 1;
436 TREE_READONLY (value) = ! flag_writable_strings;
437 TREE_STATIC (value) = 1;
441 /* To speed up processing of attributes, we maintain an array of
442 IDENTIFIER_NODES and the corresponding attribute types. */
444 /* Array to hold attribute information. */
446 static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
448 static int attrtab_idx = 0;
450 /* Add an entry to the attribute table above. */
453 add_attribute (id, string, min_len, max_len, decl_req)
456 int min_len, max_len;
461 attrtab[attrtab_idx].id = id;
462 attrtab[attrtab_idx].name = get_identifier (string);
463 attrtab[attrtab_idx].min = min_len;
464 attrtab[attrtab_idx].max = max_len;
465 attrtab[attrtab_idx++].decl_req = decl_req;
467 sprintf (buf, "__%s__", string);
469 attrtab[attrtab_idx].id = id;
470 attrtab[attrtab_idx].name = get_identifier (buf);
471 attrtab[attrtab_idx].min = min_len;
472 attrtab[attrtab_idx].max = max_len;
473 attrtab[attrtab_idx++].decl_req = decl_req;
476 /* Initialize attribute table. */
481 add_attribute (A_PACKED, "packed", 0, 0, 0);
482 add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
483 add_attribute (A_COMMON, "common", 0, 0, 1);
484 add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
485 add_attribute (A_NORETURN, "volatile", 0, 0, 1);
486 add_attribute (A_UNUSED, "unused", 0, 0, 0);
487 add_attribute (A_CONST, "const", 0, 0, 1);
488 add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
489 add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
490 add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
491 add_attribute (A_MODE, "mode", 1, 1, 1);
492 add_attribute (A_SECTION, "section", 1, 1, 1);
493 add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
494 add_attribute (A_FORMAT, "format", 3, 3, 1);
495 add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
496 add_attribute (A_WEAK, "weak", 0, 0, 1);
497 add_attribute (A_ALIAS, "alias", 1, 1, 1);
498 add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
499 add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
500 add_attribute (A_MALLOC, "malloc", 0, 0, 1);
501 add_attribute (A_NO_LIMIT_STACK, "no_stack_limit", 0, 0, 1);
502 add_attribute (A_PURE, "pure", 0, 0, 1);
505 /* Default implementation of valid_lang_attribute, below. By default, there
506 are no language-specific attributes. */
509 default_valid_lang_attribute (attr_name, attr_args, decl, type)
510 tree attr_name ATTRIBUTE_UNUSED;
511 tree attr_args ATTRIBUTE_UNUSED;
512 tree decl ATTRIBUTE_UNUSED;
513 tree type ATTRIBUTE_UNUSED;
518 /* Return a 1 if ATTR_NAME and ATTR_ARGS denote a valid language-specific
519 attribute for either declaration DECL or type TYPE and 0 otherwise. */
521 int (*valid_lang_attribute) PARAMS ((tree, tree, tree, tree))
522 = default_valid_lang_attribute;
524 /* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
525 and install them in NODE, which is either a DECL (including a TYPE_DECL)
526 or a TYPE. PREFIX_ATTRIBUTES can appear after the declaration specifiers
527 and declaration modifiers but before the declaration proper. */
530 decl_attributes (node, attributes, prefix_attributes)
531 tree node, attributes, prefix_attributes;
533 tree decl = 0, type = 0;
537 if (attrtab_idx == 0)
543 type = TREE_TYPE (decl);
544 is_type = TREE_CODE (node) == TYPE_DECL;
546 else if (TYPE_P (node))
547 type = node, is_type = 1;
549 #ifdef PRAGMA_INSERT_ATTRIBUTES
550 /* If the code in c-pragma.c wants to insert some attributes then
551 allow it to do so. Do this before allowing machine back ends to
552 insert attributes, so that they have the opportunity to override
553 anything done here. */
554 PRAGMA_INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
557 #ifdef INSERT_ATTRIBUTES
558 INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
561 attributes = chainon (prefix_attributes, attributes);
563 for (a = attributes; a; a = TREE_CHAIN (a))
565 tree name = TREE_PURPOSE (a);
566 tree args = TREE_VALUE (a);
570 for (i = 0; i < attrtab_idx; i++)
571 if (attrtab[i].name == name)
574 if (i == attrtab_idx)
576 if (! valid_machine_attribute (name, args, decl, type)
577 && ! (* valid_lang_attribute) (name, args, decl, type))
578 warning ("`%s' attribute directive ignored",
579 IDENTIFIER_POINTER (name));
581 type = TREE_TYPE (decl);
584 else if (attrtab[i].decl_req && decl == 0)
586 warning ("`%s' attribute does not apply to types",
587 IDENTIFIER_POINTER (name));
590 else if (list_length (args) < attrtab[i].min
591 || list_length (args) > attrtab[i].max)
593 error ("wrong number of arguments specified for `%s' attribute",
594 IDENTIFIER_POINTER (name));
603 TYPE_PACKED (type) = 1;
604 else if (TREE_CODE (decl) == FIELD_DECL)
605 DECL_PACKED (decl) = 1;
606 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
607 used for DECL_REGISTER. It wouldn't mean anything anyway. */
609 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
613 if (TREE_CODE (decl) == VAR_DECL)
614 DECL_COMMON (decl) = 0;
616 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
620 if (TREE_CODE (decl) == VAR_DECL)
621 DECL_COMMON (decl) = 1;
623 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
627 if (TREE_CODE (decl) == FUNCTION_DECL)
628 TREE_THIS_VOLATILE (decl) = 1;
629 else if (TREE_CODE (type) == POINTER_TYPE
630 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
631 TREE_TYPE (decl) = type
633 (build_type_variant (TREE_TYPE (type),
634 TREE_READONLY (TREE_TYPE (type)), 1));
636 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
640 if (TREE_CODE (decl) == FUNCTION_DECL)
641 DECL_IS_MALLOC (decl) = 1;
642 /* ??? TODO: Support types. */
644 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
650 TREE_USED (decl) = 1;
652 TREE_USED (type) = 1;
653 else if (TREE_CODE (decl) == PARM_DECL
654 || TREE_CODE (decl) == VAR_DECL
655 || TREE_CODE (decl) == FUNCTION_DECL
656 || TREE_CODE (decl) == LABEL_DECL)
657 TREE_USED (decl) = 1;
659 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
663 if (TREE_CODE (decl) == FUNCTION_DECL)
664 TREE_READONLY (decl) = 1;
665 else if (TREE_CODE (type) == POINTER_TYPE
666 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
667 TREE_TYPE (decl) = type
669 (build_type_variant (TREE_TYPE (type), 1,
670 TREE_THIS_VOLATILE (TREE_TYPE (type))));
672 warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
676 if (TREE_CODE (decl) == FUNCTION_DECL)
677 DECL_IS_PURE (decl) = 1;
678 /* ??? TODO: Support types. */
680 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
686 && TREE_CODE (type) == UNION_TYPE
688 || (TYPE_FIELDS (type) != 0
689 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
690 TYPE_TRANSPARENT_UNION (type) = 1;
691 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
692 && TREE_CODE (type) == UNION_TYPE
693 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
694 DECL_TRANSPARENT_UNION (decl) = 1;
696 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
700 if (TREE_CODE (decl) == FUNCTION_DECL
701 && TREE_CODE (type) == FUNCTION_TYPE
702 && decl_function_context (decl) == 0)
704 DECL_STATIC_CONSTRUCTOR (decl) = 1;
705 TREE_USED (decl) = 1;
708 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
712 if (TREE_CODE (decl) == FUNCTION_DECL
713 && TREE_CODE (type) == FUNCTION_TYPE
714 && decl_function_context (decl) == 0)
716 DECL_STATIC_DESTRUCTOR (decl) = 1;
717 TREE_USED (decl) = 1;
720 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
724 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
725 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
729 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
730 int len = strlen (p);
731 enum machine_mode mode = VOIDmode;
734 if (len > 4 && p[0] == '_' && p[1] == '_'
735 && p[len - 1] == '_' && p[len - 2] == '_')
737 char *newp = (char *) alloca (len - 1);
739 strcpy (newp, &p[2]);
740 newp[len - 4] = '\0';
744 /* Give this decl a type with the specified mode.
745 First check for the special modes. */
746 if (! strcmp (p, "byte"))
748 else if (!strcmp (p, "word"))
750 else if (! strcmp (p, "pointer"))
753 for (j = 0; j < NUM_MACHINE_MODES; j++)
754 if (!strcmp (p, GET_MODE_NAME (j)))
755 mode = (enum machine_mode) j;
757 if (mode == VOIDmode)
758 error ("unknown machine mode `%s'", p);
759 else if (0 == (typefm = type_for_mode (mode,
760 TREE_UNSIGNED (type))))
761 error ("no data type for mode `%s'", p);
764 TREE_TYPE (decl) = type = typefm;
765 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
766 layout_decl (decl, 0);
772 #ifdef ASM_OUTPUT_SECTION_NAME
773 if ((TREE_CODE (decl) == FUNCTION_DECL
774 || TREE_CODE (decl) == VAR_DECL)
775 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
777 if (TREE_CODE (decl) == VAR_DECL
778 && current_function_decl != NULL_TREE
779 && ! TREE_STATIC (decl))
780 error_with_decl (decl,
781 "section attribute cannot be specified for local variables");
782 /* The decl may have already been given a section attribute from
783 a previous declaration. Ensure they match. */
784 else if (DECL_SECTION_NAME (decl) != NULL_TREE
785 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
786 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
787 error_with_decl (node,
788 "section of `%s' conflicts with previous declaration");
790 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
793 error_with_decl (node,
794 "section attribute not allowed for `%s'");
796 error_with_decl (node,
797 "section attributes are not supported for this target");
804 = (args ? TREE_VALUE (args)
805 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
808 /* Strip any NOPs of any kind. */
809 while (TREE_CODE (align_expr) == NOP_EXPR
810 || TREE_CODE (align_expr) == CONVERT_EXPR
811 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
812 align_expr = TREE_OPERAND (align_expr, 0);
814 if (TREE_CODE (align_expr) != INTEGER_CST)
816 error ("requested alignment is not a constant");
820 if ((i = tree_log2 (align_expr)) == -1)
821 error ("requested alignment is not a power of 2");
822 else if (i > HOST_BITS_PER_INT - 2)
823 error ("requested alignment is too large");
826 /* If we have a TYPE_DECL, then copy the type, so that we
827 don't accidentally modify a builtin type. See pushdecl. */
828 if (decl && TREE_TYPE (decl) != error_mark_node
829 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
831 tree tt = TREE_TYPE (decl);
832 DECL_ORIGINAL_TYPE (decl) = tt;
833 tt = build_type_copy (tt);
834 TYPE_NAME (tt) = decl;
835 TREE_USED (tt) = TREE_USED (decl);
836 TREE_TYPE (decl) = tt;
840 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
841 TYPE_USER_ALIGN (type) = 1;
843 else if (TREE_CODE (decl) != VAR_DECL
844 && TREE_CODE (decl) != FIELD_DECL)
845 error_with_decl (decl,
846 "alignment may not be specified for `%s'");
849 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
850 DECL_USER_ALIGN (decl) = 1;
857 tree format_type_id = TREE_VALUE (args);
858 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
859 tree first_arg_num_expr
860 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
861 unsigned HOST_WIDE_INT format_num, first_arg_num;
862 enum format_type format_type;
864 unsigned int arg_num;
866 if (TREE_CODE (decl) != FUNCTION_DECL)
868 error_with_decl (decl,
869 "argument format specified for non-function `%s'");
873 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
875 error ("unrecognized format specifier");
880 const char *p = IDENTIFIER_POINTER (format_type_id);
882 if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
883 format_type = printf_format_type;
884 else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
885 format_type = scanf_format_type;
886 else if (!strcmp (p, "strftime")
887 || !strcmp (p, "__strftime__"))
888 format_type = strftime_format_type;
891 warning ("`%s' is an unrecognized format function type", p);
896 /* Strip any conversions from the string index and first arg number
897 and verify they are constants. */
898 while (TREE_CODE (format_num_expr) == NOP_EXPR
899 || TREE_CODE (format_num_expr) == CONVERT_EXPR
900 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
901 format_num_expr = TREE_OPERAND (format_num_expr, 0);
903 while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
904 || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
905 || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
906 first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
908 if (TREE_CODE (format_num_expr) != INTEGER_CST
909 || TREE_INT_CST_HIGH (format_num_expr) != 0
910 || TREE_CODE (first_arg_num_expr) != INTEGER_CST
911 || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
913 error ("format string has invalid operand number");
917 format_num = TREE_INT_CST_LOW (format_num_expr);
918 first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
919 if (first_arg_num != 0 && first_arg_num <= format_num)
921 error ("format string arg follows the args to be formatted");
925 /* If a parameter list is specified, verify that the format_num
926 argument is actually a string, in case the format attribute
928 argument = TYPE_ARG_TYPES (type);
931 for (arg_num = 1; argument != 0 && arg_num != format_num;
932 ++arg_num, argument = TREE_CHAIN (argument))
936 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
937 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
940 error ("format string arg not a string type");
944 else if (first_arg_num != 0)
946 /* Verify that first_arg_num points to the last arg,
949 arg_num++, argument = TREE_CHAIN (argument);
951 if (arg_num != first_arg_num)
953 error ("args to be formatted is not '...'");
959 record_function_format (DECL_NAME (decl),
960 DECL_ASSEMBLER_NAME (decl),
961 format_type, format_num, first_arg_num);
967 tree format_num_expr = TREE_VALUE (args);
968 unsigned HOST_WIDE_INT format_num;
969 unsigned int arg_num;
972 if (TREE_CODE (decl) != FUNCTION_DECL)
974 error_with_decl (decl,
975 "argument format specified for non-function `%s'");
979 /* Strip any conversions from the first arg number and verify it
981 while (TREE_CODE (format_num_expr) == NOP_EXPR
982 || TREE_CODE (format_num_expr) == CONVERT_EXPR
983 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
984 format_num_expr = TREE_OPERAND (format_num_expr, 0);
986 if (TREE_CODE (format_num_expr) != INTEGER_CST
987 || TREE_INT_CST_HIGH (format_num_expr) != 0)
989 error ("format string has invalid operand number");
993 format_num = TREE_INT_CST_LOW (format_num_expr);
995 /* If a parameter list is specified, verify that the format_num
996 argument is actually a string, in case the format attribute
998 argument = TYPE_ARG_TYPES (type);
1001 for (arg_num = 1; argument != 0 && arg_num != format_num;
1002 ++arg_num, argument = TREE_CHAIN (argument))
1006 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
1007 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
1010 error ("format string arg not a string type");
1015 if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
1016 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
1019 error ("function does not return string type");
1023 record_international_format (DECL_NAME (decl),
1024 DECL_ASSEMBLER_NAME (decl),
1030 declare_weak (decl);
1034 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
1035 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
1036 error_with_decl (decl,
1037 "`%s' defined both normally and as an alias");
1038 else if (decl_function_context (decl) == 0)
1042 id = TREE_VALUE (args);
1043 if (TREE_CODE (id) != STRING_CST)
1045 error ("alias arg not a string");
1048 id = get_identifier (TREE_STRING_POINTER (id));
1049 /* This counts as a use of the object pointed to. */
1052 if (TREE_CODE (decl) == FUNCTION_DECL)
1053 DECL_INITIAL (decl) = error_mark_node;
1055 DECL_EXTERNAL (decl) = 0;
1056 assemble_alias (decl, id);
1059 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1062 case A_NO_CHECK_MEMORY_USAGE:
1063 if (TREE_CODE (decl) != FUNCTION_DECL)
1065 error_with_decl (decl,
1066 "`%s' attribute applies only to functions",
1067 IDENTIFIER_POINTER (name));
1069 else if (DECL_INITIAL (decl))
1071 error_with_decl (decl,
1072 "can't set `%s' attribute after definition",
1073 IDENTIFIER_POINTER (name));
1076 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1079 case A_NO_INSTRUMENT_FUNCTION:
1080 if (TREE_CODE (decl) != FUNCTION_DECL)
1082 error_with_decl (decl,
1083 "`%s' attribute applies only to functions",
1084 IDENTIFIER_POINTER (name));
1086 else if (DECL_INITIAL (decl))
1088 error_with_decl (decl,
1089 "can't set `%s' attribute after definition",
1090 IDENTIFIER_POINTER (name));
1093 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1096 case A_NO_LIMIT_STACK:
1097 if (TREE_CODE (decl) != FUNCTION_DECL)
1099 error_with_decl (decl,
1100 "`%s' attribute applies only to functions",
1101 IDENTIFIER_POINTER (name));
1103 else if (DECL_INITIAL (decl))
1105 error_with_decl (decl,
1106 "can't set `%s' attribute after definition",
1107 IDENTIFIER_POINTER (name));
1110 DECL_NO_LIMIT_STACK (decl) = 1;
1116 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1117 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1119 The head of the declspec list is stored in DECLSPECS.
1120 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1122 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1123 the list elements. We drop the containing TREE_LIST nodes and link the
1124 resulting attributes together the way decl_attributes expects them. */
1127 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1129 tree *declspecs, *prefix_attributes;
1131 tree t, s, a, next, specs, attrs;
1133 /* This can happen after an __extension__ in pedantic mode. */
1134 if (specs_attrs != NULL_TREE
1135 && TREE_CODE (specs_attrs) == INTEGER_CST)
1137 *declspecs = NULL_TREE;
1138 *prefix_attributes = NULL_TREE;
1142 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1143 if (specs_attrs != NULL_TREE
1144 && TREE_CODE (specs_attrs) != TREE_LIST)
1146 *declspecs = specs_attrs;
1147 *prefix_attributes = NULL_TREE;
1151 /* Remember to keep the lists in the same order, element-wise. */
1153 specs = s = NULL_TREE;
1154 attrs = a = NULL_TREE;
1155 for (t = specs_attrs; t; t = next)
1157 next = TREE_CHAIN (t);
1158 /* Declspecs have a non-NULL TREE_VALUE. */
1159 if (TREE_VALUE (t) != NULL_TREE)
1161 if (specs == NULL_TREE)
1171 if (attrs == NULL_TREE)
1172 attrs = a = TREE_PURPOSE (t);
1175 TREE_CHAIN (a) = TREE_PURPOSE (t);
1176 a = TREE_PURPOSE (t);
1178 /* More attrs can be linked here, move A to the end. */
1179 while (TREE_CHAIN (a) != NULL_TREE)
1184 /* Terminate the lists. */
1186 TREE_CHAIN (s) = NULL_TREE;
1188 TREE_CHAIN (a) = NULL_TREE;
1192 *prefix_attributes = attrs;
1195 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1196 This function is used by the parser when a rule will accept attributes
1197 in a particular position, but we don't want to support that just yet.
1199 A warning is issued for every ignored attribute. */
1202 strip_attrs (specs_attrs)
1207 split_specs_attrs (specs_attrs, &specs, &attrs);
1211 warning ("`%s' attribute ignored",
1212 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1213 attrs = TREE_CHAIN (attrs);
1219 /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
1220 a parameter list. */
1222 /* The meaningfully distinct length modifiers for format checking recognised
1239 /* The standard versions in which various format features appeared. */
1240 enum format_std_version
1249 /* Structure describing a length modifier supported in format checking, and
1250 possibly a doubled version such as "hh". */
1253 /* Name of the single-character length modifier. */
1255 /* Index into a format_char_info.types array. */
1256 enum format_lengths index;
1257 /* Standard version this length appears in. */
1258 enum format_std_version std;
1259 /* Same, if the modifier can be repeated, or NULL if it can't. */
1260 const char *double_name;
1261 enum format_lengths double_index;
1262 enum format_std_version double_std;
1263 } format_length_info;
1266 /* Structure desribing the combination of a conversion specifier
1267 (or a set of specifiers which act identically) and a length modifier. */
1270 /* The standard version this combination of length and type appeared in.
1271 This is only relevant if greater than those for length and type
1272 individually; otherwise it is ignored. */
1273 enum format_std_version std;
1274 /* The name to use for the type, if different from that generated internally
1275 (e.g., "signed size_t"). */
1277 /* The type itself. */
1279 } format_type_detail;
1282 /* Macros to fill out tables of these. */
1283 #define BADLEN { 0, NULL, NULL }
1284 #define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
1287 /* Structure desribing a format conversion specifier (or a set of specifiers
1288 which act identically), and the length modifiers used with it. */
1291 const char *format_chars;
1293 enum format_std_version std;
1294 /* Types accepted for each length modifier. */
1295 format_type_detail types[FMT_LEN_MAX];
1296 /* List of other modifier characters allowed with these options.
1297 This lists flags, and additionally "w" for width, "p" for precision,
1298 "c" for generic character pointers being allowed, "a" for scanf
1299 "a" allocation extension (not applicable in C99 mode), "*" for
1300 scanf suppression, "2" for strftime two digit year formats, "3"
1301 for strftime formats giving two digit years in some locales, "E"
1302 and "O" for those strftime modifiers, "o" if use of strftime "O"
1303 is a GNU extension beyond C99, and "W" if the argument is a
1304 pointer which is dereferenced and written into. */
1305 const char *flag_chars;
1309 /* Structure describing a particular kind of format processed by GCC. */
1312 /* The name of this kind of format, for use in diagnostics. */
1314 /* Specifications of the length modifiers accepted; possibly NULL. */
1315 const format_length_info *length_char_specs;
1316 /* Details of the conversion specification characters accepted. */
1317 const format_char_info *conversion_specs;
1321 /* Structure describing details of a type expected in format checking,
1322 and the type to check against it. */
1323 typedef struct format_wanted_type
1325 /* The type wanted. */
1327 /* The name of this type to use in diagnostics. */
1328 const char *wanted_type_name;
1329 /* The level of indirection through pointers at which this type occurs. */
1331 /* Whether, when pointer_count is 1, to allow any character type when
1332 pedantic, rather than just the character or void type specified. */
1333 int char_lenient_flag;
1334 /* Whether the argument, dereferenced once, is written into and so the
1335 argument must not be a pointer to a const-qualified type. */
1336 int writing_in_flag;
1337 /* If warnings should be of the form "field precision is not type int",
1338 the name to use (in this case "field precision"), otherwise NULL,
1339 for "%s format, %s arg" type messages. If (in an extension), this
1340 is a pointer type, wanted_type_name should be set to include the
1341 terminating '*' characters of the type name to give a correct
1344 /* The actual parameter to check against the wanted type. */
1346 /* The argument number of that parameter. */
1348 /* The next type to check for this format conversion, or NULL if none. */
1349 struct format_wanted_type *next;
1350 } format_wanted_type;
1353 static const format_length_info printf_length_specs[] =
1355 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1356 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1357 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1358 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1359 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1360 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
1361 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1362 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1363 { NULL, 0, 0, NULL, 0, 0 }
1367 /* This differs from printf_length_specs only in that "Z" is not accepted. */
1368 static const format_length_info scanf_length_specs[] =
1370 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1371 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1372 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1373 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1374 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1375 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1376 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1377 { NULL, 0, 0, NULL, 0, 0 }
1381 #define T_I &integer_type_node
1382 #define T89_I { STD_C89, NULL, T_I }
1383 #define T99_I { STD_C99, NULL, T_I }
1384 #define T_L &long_integer_type_node
1385 #define T89_L { STD_C89, NULL, T_L }
1386 #define T_LL &long_long_integer_type_node
1387 #define T99_LL { STD_C99, NULL, T_LL }
1388 #define TEX_LL { STD_EXT, NULL, T_LL }
1389 #define T_S &short_integer_type_node
1390 #define T89_S { STD_C89, NULL, T_S }
1391 #define T_UI &unsigned_type_node
1392 #define T89_UI { STD_C89, NULL, T_UI }
1393 #define T99_UI { STD_C99, NULL, T_UI }
1394 #define T_UL &long_unsigned_type_node
1395 #define T89_UL { STD_C89, NULL, T_UL }
1396 #define T_ULL &long_long_unsigned_type_node
1397 #define T99_ULL { STD_C99, NULL, T_ULL }
1398 #define TEX_ULL { STD_EXT, NULL, T_ULL }
1399 #define T_US &short_unsigned_type_node
1400 #define T89_US { STD_C89, NULL, T_US }
1401 #define T_F &float_type_node
1402 #define T89_F { STD_C89, NULL, T_F }
1403 #define T99_F { STD_C99, NULL, T_F }
1404 #define T_D &double_type_node
1405 #define T89_D { STD_C89, NULL, T_D }
1406 #define T99_D { STD_C99, NULL, T_D }
1407 #define T_LD &long_double_type_node
1408 #define T89_LD { STD_C89, NULL, T_LD }
1409 #define T99_LD { STD_C99, NULL, T_LD }
1410 #define T_C &char_type_node
1411 #define T89_C { STD_C89, NULL, T_C }
1412 #define T_SC &signed_char_type_node
1413 #define T99_SC { STD_C99, NULL, T_SC }
1414 #define T_UC &unsigned_char_type_node
1415 #define T99_UC { STD_C99, NULL, T_UC }
1416 #define T_V &void_type_node
1417 #define T89_V { STD_C89, NULL, T_V }
1418 #define T_W &wchar_type_node
1419 #define T94_W { STD_C94, "wchar_t", T_W }
1420 #define TEX_W { STD_EXT, "wchar_t", T_W }
1421 #define T_WI &wint_type_node
1422 #define T94_WI { STD_C94, "wint_t", T_WI }
1423 #define TEX_WI { STD_EXT, "wint_t", T_WI }
1424 #define T_ST &c_size_type_node
1425 #define T99_ST { STD_C99, "size_t", T_ST }
1426 #define T_SST &signed_size_type_node
1427 #define T99_SST { STD_C99, "signed size_t", T_SST }
1428 #define T_PD &ptrdiff_type_node
1429 #define T99_PD { STD_C99, "ptrdiff_t", T_PD }
1430 #define T_UPD &unsigned_ptrdiff_type_node
1431 #define T99_UPD { STD_C99, "unsigned ptrdiff_t", T_UPD }
1432 #define T_IM NULL /* intmax_t not yet implemented. */
1433 #define T99_IM { STD_C99, "intmax_t", T_IM }
1434 #define T_UIM NULL /* uintmax_t not yet implemented. */
1435 #define T99_UIM { STD_C99, "uintmax_t", T_UIM }
1437 static const format_char_info print_char_table[] =
1439 /* C89 conversion specifiers. */
1440 { "di", 0, STD_C89, { T89_I, T99_I, T89_I, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I" },
1441 { "oxX", 0, STD_C89, { T89_UI, T99_UI, T89_UI, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#" },
1442 { "u", 0, STD_C89, { T89_UI, T99_UI, T89_UI, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I" },
1443 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'" },
1444 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#" },
1445 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w" },
1446 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wpc" },
1447 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wc" },
1448 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "W" },
1449 /* C99 conversion specifiers. */
1450 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'" },
1451 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#" },
1452 /* X/Open conversion specifiers. */
1453 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w" },
1454 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp" },
1455 /* GNU conversion specifiers. */
1456 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp" },
1457 { NULL, 0, 0, NOLENGTHS, NULL }
1460 static const format_char_info scan_char_table[] =
1462 /* C89 conversion specifiers. */
1463 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*wW" },
1464 { "ouxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*wW" },
1465 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*wW" },
1466 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*cwW" },
1467 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*acwW" },
1468 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*acwW" },
1469 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*wW" },
1470 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "W" },
1471 /* C99 conversion specifiers. */
1472 { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*wW" },
1473 /* X/Open conversion specifiers. */
1474 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*wW" },
1475 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*awW" },
1476 { NULL, 0, 0, NOLENGTHS, NULL }
1479 static format_char_info time_char_table[] =
1481 /* C89 conversion specifiers. */
1482 { "ABZab", 0, STD_C89, NOLENGTHS, "^#" },
1483 { "cx", 0, STD_C89, NOLENGTHS, "3E" },
1484 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow" },
1485 { "j", 0, STD_C89, NOLENGTHS, "-_0Oow" },
1486 { "p", 0, STD_C89, NOLENGTHS, "#" },
1487 { "X", 0, STD_C89, NOLENGTHS, "E" },
1488 { "y", 0, STD_C89, NOLENGTHS, "2EO-_0w" },
1489 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOow" },
1490 { "%", 0, STD_C89, NOLENGTHS, "" },
1491 /* C99 conversion specifiers. */
1492 { "C", 0, STD_C99, NOLENGTHS, "-_0EOow" },
1493 { "D", 0, STD_C99, NOLENGTHS, "2" },
1494 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow" },
1495 { "FRTnrt", 0, STD_C99, NOLENGTHS, "" },
1496 { "g", 0, STD_C99, NOLENGTHS, "2Oo-_0w" },
1497 { "G", 0, STD_C99, NOLENGTHS, "-_0Oow" },
1498 { "h", 0, STD_C99, NOLENGTHS, "^#" },
1499 { "z", 0, STD_C99, NOLENGTHS, "Oo" },
1500 /* GNU conversion specifiers. */
1501 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow" },
1502 { "P", 0, STD_EXT, NOLENGTHS, "" },
1503 { NULL, 0, 0, NOLENGTHS, NULL }
1507 /* This must be in the same order as enum format_type. */
1508 static const format_kind_info format_types[] =
1510 { "printf", printf_length_specs, print_char_table },
1511 { "scanf", scanf_length_specs, scan_char_table },
1512 { "strftime", NULL, time_char_table }
1516 typedef struct function_format_info
1518 struct function_format_info *next; /* next structure on the list */
1519 tree name; /* identifier such as "printf" */
1520 tree assembler_name; /* optional mangled identifier (for C++) */
1521 enum format_type format_type; /* type of format (printf, scanf, etc.) */
1522 int format_num; /* number of format argument */
1523 int first_arg_num; /* number of first arg (zero for varargs) */
1524 } function_format_info;
1526 static function_format_info *function_format_list = NULL;
1528 typedef struct international_format_info
1530 struct international_format_info *next; /* next structure on the list */
1531 tree name; /* identifier such as "gettext" */
1532 tree assembler_name; /* optional mangled identifier (for C++) */
1533 int format_num; /* number of format argument */
1534 } international_format_info;
1536 static international_format_info *international_format_list = NULL;
1538 static void check_format_info PARAMS ((function_format_info *, tree));
1540 static void init_dollar_format_checking PARAMS ((int, tree));
1541 static int maybe_read_dollar_number PARAMS ((const char **, int,
1543 static void finish_dollar_format_checking PARAMS ((void));
1545 static void check_format_types PARAMS ((format_wanted_type *));
1547 /* Initialize the table of functions to perform format checking on.
1548 The ISO C functions are always checked (whether <stdio.h> is
1549 included or not), since it is common to call printf without
1550 including <stdio.h>. There shouldn't be a problem with this,
1551 since ISO C reserves these function names whether you include the
1552 header file or not. In any case, the checking is harmless. With
1553 -ffreestanding, these default attributes are disabled, and must be
1554 specified manually if desired.
1556 Also initialize the name of function that modify the format string for
1557 internationalization purposes. */
1560 init_function_format_info ()
1564 /* Functions from ISO/IEC 9899:1990. */
1565 record_function_format (get_identifier ("printf"), NULL_TREE,
1566 printf_format_type, 1, 2);
1567 record_function_format (get_identifier ("fprintf"), NULL_TREE,
1568 printf_format_type, 2, 3);
1569 record_function_format (get_identifier ("sprintf"), NULL_TREE,
1570 printf_format_type, 2, 3);
1571 record_function_format (get_identifier ("scanf"), NULL_TREE,
1572 scanf_format_type, 1, 2);
1573 record_function_format (get_identifier ("fscanf"), NULL_TREE,
1574 scanf_format_type, 2, 3);
1575 record_function_format (get_identifier ("sscanf"), NULL_TREE,
1576 scanf_format_type, 2, 3);
1577 record_function_format (get_identifier ("vprintf"), NULL_TREE,
1578 printf_format_type, 1, 0);
1579 record_function_format (get_identifier ("vfprintf"), NULL_TREE,
1580 printf_format_type, 2, 0);
1581 record_function_format (get_identifier ("vsprintf"), NULL_TREE,
1582 printf_format_type, 2, 0);
1583 record_function_format (get_identifier ("strftime"), NULL_TREE,
1584 strftime_format_type, 3, 0);
1587 if (flag_hosted && flag_isoc99)
1589 /* ISO C99 adds the snprintf and vscanf family functions. */
1590 record_function_format (get_identifier ("snprintf"), NULL_TREE,
1591 printf_format_type, 3, 4);
1592 record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
1593 printf_format_type, 3, 0);
1594 record_function_format (get_identifier ("vscanf"), NULL_TREE,
1595 scanf_format_type, 1, 0);
1596 record_function_format (get_identifier ("vfscanf"), NULL_TREE,
1597 scanf_format_type, 2, 0);
1598 record_function_format (get_identifier ("vsscanf"), NULL_TREE,
1599 scanf_format_type, 2, 0);
1602 if (flag_hosted && flag_noniso_default_format_attributes)
1604 /* Uniforum/GNU gettext functions, not in ISO C. */
1605 record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
1606 record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
1607 record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
1611 /* Record information for argument format checking. FUNCTION_IDENT is
1612 the identifier node for the name of the function to check (its decl
1613 need not exist yet).
1614 FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
1615 of the argument which is the format control string (starting from 1).
1616 FIRST_ARG_NUM is the number of the first actual argument to check
1617 against the format string, or zero if no checking is not be done
1618 (e.g. for varargs such as vfprintf). */
1621 record_function_format (name, assembler_name, format_type,
1622 format_num, first_arg_num)
1624 tree assembler_name;
1625 enum format_type format_type;
1629 function_format_info *info;
1631 /* Re-use existing structure if it's there. */
1633 for (info = function_format_list; info; info = info->next)
1635 if (info->name == name && info->assembler_name == assembler_name)
1640 info = (function_format_info *) xmalloc (sizeof (function_format_info));
1641 info->next = function_format_list;
1642 function_format_list = info;
1645 info->assembler_name = assembler_name;
1648 info->format_type = format_type;
1649 info->format_num = format_num;
1650 info->first_arg_num = first_arg_num;
1653 /* Record information for the names of function that modify the format
1654 argument to format functions. FUNCTION_IDENT is the identifier node for
1655 the name of the function (its decl need not exist yet) and FORMAT_NUM is
1656 the number of the argument which is the format control string (starting
1660 record_international_format (name, assembler_name, format_num)
1662 tree assembler_name;
1665 international_format_info *info;
1667 /* Re-use existing structure if it's there. */
1669 for (info = international_format_list; info; info = info->next)
1671 if (info->name == name && info->assembler_name == assembler_name)
1678 = (international_format_info *)
1679 xmalloc (sizeof (international_format_info));
1680 info->next = international_format_list;
1681 international_format_list = info;
1684 info->assembler_name = assembler_name;
1687 info->format_num = format_num;
1693 warning ("too few arguments for format");
1696 /* Check the argument list of a call to printf, scanf, etc.
1697 NAME is the function identifier.
1698 ASSEMBLER_NAME is the function's assembler identifier.
1699 (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
1700 PARAMS is the list of argument values. */
1703 check_function_format (name, assembler_name, params)
1705 tree assembler_name;
1708 function_format_info *info;
1710 /* See if this function is a format function. */
1711 for (info = function_format_list; info; info = info->next)
1713 if (info->assembler_name
1714 ? (info->assembler_name == assembler_name)
1715 : (info->name == name))
1717 /* Yup; check it. */
1718 check_format_info (info, params);
1725 /* Variables used by the checking of $ operand number formats. */
1726 static char *dollar_arguments_used = NULL;
1727 static int dollar_arguments_alloc = 0;
1728 static int dollar_arguments_count;
1729 static int dollar_first_arg_num;
1730 static int dollar_max_arg_used;
1731 static int dollar_format_warned;
1733 /* Initialize the checking for a format string that may contain $
1734 parameter number specifications; we will need to keep track of whether
1735 each parameter has been used. FIRST_ARG_NUM is the number of the first
1736 argument that is a parameter to the format, or 0 for a vprintf-style
1737 function; PARAMS is the list of arguments starting at this argument. */
1740 init_dollar_format_checking (first_arg_num, params)
1744 dollar_first_arg_num = first_arg_num;
1745 dollar_arguments_count = 0;
1746 dollar_max_arg_used = 0;
1747 dollar_format_warned = 0;
1748 if (first_arg_num > 0)
1752 dollar_arguments_count++;
1753 params = TREE_CHAIN (params);
1756 if (dollar_arguments_alloc < dollar_arguments_count)
1758 if (dollar_arguments_used)
1759 free (dollar_arguments_used);
1760 dollar_arguments_alloc = dollar_arguments_count;
1761 dollar_arguments_used = xmalloc (dollar_arguments_alloc);
1763 if (dollar_arguments_alloc)
1764 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1768 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1769 is set, it is an error if one is not found; otherwise, it is OK. If
1770 such a number is found, check whether it is within range and mark that
1771 numbered operand as being used for later checking. Returns the operand
1772 number if found and within range, zero if no such number was found and
1773 this is OK, or -1 on error. PARAMS points to the first operand of the
1774 format; PARAM_PTR is made to point to the parameter referred to. If
1775 a $ format is found, *FORMAT is updated to point just after it. */
1778 maybe_read_dollar_number (format, dollar_needed, params, param_ptr)
1779 const char **format;
1786 const char *fcp = *format;
1787 if (*fcp < '0' || *fcp > '9')
1791 warning ("missing $ operand number in format");
1799 while (*fcp >= '0' && *fcp <= '9')
1802 nargnum = 10 * argnum + (*fcp - '0');
1803 if (nargnum < 0 || nargnum / 10 != argnum)
1812 warning ("missing $ operand number in format");
1819 if (pedantic && !dollar_format_warned)
1821 warning ("ISO C does not support %%n$ operand number formats");
1822 dollar_format_warned = 1;
1824 if (overflow_flag || argnum == 0
1825 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1827 warning ("operand number out of range in format");
1830 if (argnum > dollar_max_arg_used)
1831 dollar_max_arg_used = argnum;
1832 /* For vprintf-style functions we may need to allocate more memory to
1833 track which arguments are used. */
1834 while (dollar_arguments_alloc < dollar_max_arg_used)
1837 nalloc = 2 * dollar_arguments_alloc + 16;
1838 dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
1839 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1840 nalloc - dollar_arguments_alloc);
1841 dollar_arguments_alloc = nalloc;
1843 dollar_arguments_used[argnum - 1] = 1;
1844 if (dollar_first_arg_num)
1847 *param_ptr = params;
1848 for (i = 1; i < argnum && *param_ptr != 0; i++)
1849 *param_ptr = TREE_CHAIN (*param_ptr);
1851 if (*param_ptr == 0)
1853 /* This case shouldn't be caught here. */
1863 /* Finish the checking for a format string that used $ operand number formats
1864 instead of non-$ formats. We check for unused operands before used ones
1865 (a serious error, since the implementation of the format function
1866 can't know what types to pass to va_arg to find the later arguments).
1867 and for unused operands at the end of the format (if we know how many
1868 arguments the format had, so not for vprintf). If there were operand
1869 numbers out of range on a non-vprintf-style format, we won't have reached
1873 finish_dollar_format_checking ()
1876 for (i = 0; i < dollar_max_arg_used; i++)
1878 if (!dollar_arguments_used[i])
1879 warning ("format argument %d unused before used argument %d in $-style format",
1880 i + 1, dollar_max_arg_used);
1882 if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
1883 warning ("unused arguments in $-style format");
1887 /* Check the argument list of a call to printf, scanf, etc.
1888 INFO points to the function_format_info structure.
1889 PARAMS is the list of argument values. */
1892 check_format_info (info, params)
1893 function_format_info *info;
1898 int suppressed, wide, precise;
1899 const char *length_chars = NULL;
1900 enum format_lengths length_chars_val = FMT_LEN_none;
1901 enum format_std_version length_chars_std = STD_C89;
1907 enum format_std_version wanted_type_std;
1908 const char *wanted_type_name;
1909 format_wanted_type width_wanted_type;
1910 format_wanted_type precision_wanted_type;
1911 format_wanted_type main_wanted_type;
1912 format_wanted_type *first_wanted_type;
1913 format_wanted_type *last_wanted_type;
1914 tree first_fillin_param;
1915 const char *format_chars;
1916 const format_kind_info *fki = NULL;
1917 const format_length_info *fli = NULL;
1918 const format_char_info *fci = NULL;
1920 /* -1 if no conversions taking an operand have been found; 0 if one has
1921 and it didn't use $; 1 if $ formats are in use. */
1922 int has_operand_number = -1;
1924 /* Skip to format argument. If the argument isn't available, there's
1925 no work for us to do; prototype checking will catch the problem. */
1926 for (arg_num = 1; ; ++arg_num)
1930 if (arg_num == info->format_num)
1932 params = TREE_CHAIN (params);
1934 format_tree = TREE_VALUE (params);
1935 params = TREE_CHAIN (params);
1936 if (format_tree == 0)
1939 /* We can only check the format if it's a string constant. */
1940 while (TREE_CODE (format_tree) == NOP_EXPR)
1941 format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
1943 if (TREE_CODE (format_tree) == CALL_EXPR
1944 && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
1945 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
1948 tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
1950 /* See if this is a call to a known internationalization function
1951 that modifies the format arg. */
1952 international_format_info *info;
1954 for (info = international_format_list; info; info = info->next)
1955 if (info->assembler_name
1956 ? (info->assembler_name == DECL_ASSEMBLER_NAME (function))
1957 : (info->name == DECL_NAME (function)))
1962 for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
1964 inner_args = TREE_CHAIN (inner_args), i++)
1965 if (i == info->format_num)
1967 format_tree = TREE_VALUE (inner_args);
1969 while (TREE_CODE (format_tree) == NOP_EXPR)
1970 format_tree = TREE_OPERAND (format_tree, 0);
1975 if (integer_zerop (format_tree))
1977 warning ("null format string");
1980 if (TREE_CODE (format_tree) != ADDR_EXPR)
1982 /* The user may get multiple warnings if the supplied argument
1983 isn't even a string pointer. */
1984 /* Functions taking a va_list normally pass a non-literal format
1985 string. These functions typically are declared with
1986 first_arg_num == 0, so avoid warning in those cases. */
1987 if (info->first_arg_num != 0 && warn_format > 1)
1988 warning ("format not a string literal, argument types not checked");
1991 format_tree = TREE_OPERAND (format_tree, 0);
1992 if (TREE_CODE (format_tree) != STRING_CST)
1994 /* The user may get multiple warnings if the supplied argument
1995 isn't even a string pointer. */
1996 /* Functions taking a va_list normally pass a non-literal format
1997 string. These functions typically are declared with
1998 first_arg_num == 0, so avoid warning in those cases. */
1999 if (info->first_arg_num != 0 && warn_format > 1)
2000 warning ("format not a string literal, argument types not checked");
2003 format_chars = TREE_STRING_POINTER (format_tree);
2004 format_length = TREE_STRING_LENGTH (format_tree);
2005 if (format_length <= 1)
2006 warning ("zero-length format string");
2007 if (format_chars[--format_length] != 0)
2009 warning ("unterminated format string");
2012 /* Skip to first argument to check. */
2013 while (arg_num + 1 < info->first_arg_num)
2017 params = TREE_CHAIN (params);
2021 first_fillin_param = params;
2022 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2023 fki = &format_types[info->format_type];
2027 first_wanted_type = NULL;
2028 last_wanted_type = NULL;
2029 if (*format_chars == 0)
2031 if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
2032 warning ("embedded `\\0' in format");
2033 if (info->first_arg_num != 0 && params != 0
2034 && has_operand_number <= 0)
2035 warning ("too many arguments for format");
2036 if (has_operand_number > 0)
2037 finish_dollar_format_checking ();
2040 if (*format_chars++ != '%')
2042 if (*format_chars == 0)
2044 warning ("spurious trailing `%%' in format");
2047 if (*format_chars == '%')
2053 suppressed = wide = precise = FALSE;
2054 if (info->format_type == scanf_format_type)
2056 int non_zero_width_char = FALSE;
2057 suppressed = *format_chars == '*';
2060 else if (has_operand_number != 0)
2063 opnum = maybe_read_dollar_number (&format_chars,
2064 has_operand_number == 1,
2065 first_fillin_param, ¶ms);
2070 has_operand_number = 1;
2071 arg_num = opnum + info->first_arg_num - 1;
2074 has_operand_number = 0;
2076 while (ISDIGIT (*format_chars))
2079 if (*format_chars != '0')
2080 non_zero_width_char = TRUE;
2083 if (wide && !non_zero_width_char)
2084 warning ("zero width in scanf format");
2086 else if (info->format_type == strftime_format_type)
2088 while (*format_chars != 0 && index ("_-0^#", *format_chars) != 0)
2091 warning ("ISO C does not support the strftime `%c' flag",
2093 if (index (flag_chars, *format_chars) != 0)
2095 warning ("repeated `%c' flag in format",
2101 i = strlen (flag_chars);
2102 flag_chars[i++] = *format_chars++;
2106 while (ISDIGIT ((unsigned char) *format_chars))
2111 if (wide && pedantic)
2112 warning ("ISO C does not support strftime format width");
2113 if (*format_chars == 'E' || *format_chars == 'O')
2115 i = strlen (flag_chars);
2116 flag_chars[i++] = *format_chars++;
2118 if (*format_chars == 'E' || *format_chars == 'O')
2120 warning ("multiple E/O modifiers in format");
2121 while (*format_chars == 'E' || *format_chars == 'O')
2126 else if (info->format_type == printf_format_type)
2128 if (has_operand_number != 0)
2131 opnum = maybe_read_dollar_number (&format_chars,
2132 has_operand_number == 1,
2133 first_fillin_param, ¶ms);
2138 has_operand_number = 1;
2139 arg_num = opnum + info->first_arg_num - 1;
2142 has_operand_number = 0;
2145 while (*format_chars != 0 && index (" +#0-'I", *format_chars) != 0)
2147 if (index (flag_chars, *format_chars) != 0)
2148 warning ("repeated `%c' flag in format", *format_chars++);
2151 i = strlen (flag_chars);
2152 flag_chars[i++] = *format_chars++;
2156 /* "If the space and + flags both appear,
2157 the space flag will be ignored." */
2158 if (index (flag_chars, ' ') != 0
2159 && index (flag_chars, '+') != 0)
2160 warning ("use of both ` ' and `+' flags in format");
2161 /* "If the 0 and - flags both appear,
2162 the 0 flag will be ignored." */
2163 if (index (flag_chars, '0') != 0
2164 && index (flag_chars, '-') != 0)
2165 warning ("use of both `0' and `-' flags in format");
2166 if (index (flag_chars, '\'') && pedantic)
2167 warning ("ISO C does not support the `'' format flag");
2168 if (index (flag_chars, 'I') && pedantic)
2169 warning ("ISO C does not support the `I' format flag");
2170 if (*format_chars == '*')
2173 /* "...a field width...may be indicated by an asterisk.
2174 In this case, an int argument supplies the field width..." */
2181 if (has_operand_number > 0)
2184 opnum = maybe_read_dollar_number (&format_chars, 1,
2190 arg_num = opnum + info->first_arg_num - 1;
2192 if (info->first_arg_num != 0)
2194 cur_param = TREE_VALUE (params);
2195 if (has_operand_number <= 0)
2197 params = TREE_CHAIN (params);
2200 width_wanted_type.wanted_type = integer_type_node;
2201 width_wanted_type.wanted_type_name = NULL;
2202 width_wanted_type.pointer_count = 0;
2203 width_wanted_type.char_lenient_flag = 0;
2204 width_wanted_type.writing_in_flag = 0;
2205 width_wanted_type.name = _("field width");
2206 width_wanted_type.param = cur_param;
2207 width_wanted_type.arg_num = arg_num;
2208 width_wanted_type.next = NULL;
2209 if (last_wanted_type != 0)
2210 last_wanted_type->next = &width_wanted_type;
2211 if (first_wanted_type == 0)
2212 first_wanted_type = &width_wanted_type;
2213 last_wanted_type = &width_wanted_type;
2218 while (ISDIGIT (*format_chars))
2224 if (*format_chars == '.')
2228 /* "...a...precision...may be indicated by an asterisk.
2229 In this case, an int argument supplies the...precision." */
2230 if (*format_chars == '*')
2233 if (has_operand_number > 0)
2236 opnum = maybe_read_dollar_number (&format_chars, 1,
2242 arg_num = opnum + info->first_arg_num - 1;
2244 if (info->first_arg_num != 0)
2251 cur_param = TREE_VALUE (params);
2252 if (has_operand_number <= 0)
2254 params = TREE_CHAIN (params);
2257 precision_wanted_type.wanted_type = integer_type_node;
2258 precision_wanted_type.wanted_type_name = NULL;
2259 precision_wanted_type.pointer_count = 0;
2260 precision_wanted_type.char_lenient_flag = 0;
2261 precision_wanted_type.writing_in_flag = 0;
2262 precision_wanted_type.name = _("field precision");
2263 precision_wanted_type.param = cur_param;
2264 precision_wanted_type.arg_num = arg_num;
2265 precision_wanted_type.next = NULL;
2266 if (last_wanted_type != 0)
2267 last_wanted_type->next = &precision_wanted_type;
2268 if (first_wanted_type == 0)
2269 first_wanted_type = &precision_wanted_type;
2270 last_wanted_type = &precision_wanted_type;
2275 while (ISDIGIT (*format_chars))
2283 fli = fki->length_char_specs;
2286 while (fli->name != 0 && fli->name[0] != *format_chars)
2291 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2294 length_chars = fli->double_name;
2295 length_chars_val = fli->double_index;
2296 length_chars_std = fli->double_std;
2300 length_chars = fli->name;
2301 length_chars_val = fli->index;
2302 length_chars_std = fli->std;
2307 length_chars = NULL;
2308 length_chars_val = FMT_LEN_none;
2309 length_chars_std = STD_C89;
2313 /* Warn if the length modifier is non-standard. */
2314 if (length_chars_std == STD_EXT)
2315 warning ("ISO C does not support the `%s' %s length modifier",
2316 length_chars, fki->name);
2317 else if ((length_chars_std == STD_C99 && !flag_isoc99)
2318 || (length_chars_std == STD_C94 && !flag_isoc94))
2319 warning ("ISO C89 does not support the `%s' %s length modifier",
2320 length_chars, fki->name);
2322 if (*format_chars == 'a' && info->format_type == scanf_format_type
2325 if (format_chars[1] == 's' || format_chars[1] == 'S'
2326 || format_chars[1] == '[')
2328 /* `a' is used as a flag. */
2333 if (suppressed && length_chars_val != FMT_LEN_none)
2334 warning ("use of `*' and `%s' together in format", length_chars);
2336 format_char = *format_chars;
2337 if (format_char == 0
2338 || (info->format_type != strftime_format_type && format_char == '%'))
2340 warning ("conversion lacks type at end of format");
2344 fci = fki->conversion_specs;
2345 while (fci->format_chars != 0
2346 && index (fci->format_chars, format_char) == 0)
2348 if (fci->format_chars == 0)
2350 if (ISGRAPH(format_char))
2351 warning ("unknown conversion type character `%c' in format",
2354 warning ("unknown conversion type character 0x%x in format",
2360 if (fci->std == STD_EXT)
2361 warning ("ISO C does not support the `%%%c' %s format",
2362 format_char, fki->name);
2363 else if ((fci->std == STD_C99 && !flag_isoc99)
2364 || (fci->std == STD_C94 && !flag_isoc94))
2365 warning ("ISO C89 does not support the `%%%c' %s format",
2366 format_char, fki->name);
2367 if (index (flag_chars, 'O') != 0)
2369 if (index (fci->flag_chars, 'o') != 0)
2370 warning ("ISO C does not support `%%O%c'", format_char);
2371 else if (!flag_isoc99 && index (fci->flag_chars, 'O') != 0)
2372 warning ("ISO C89 does not support `%%O%c'", format_char);
2374 if (!flag_isoc99 && index (flag_chars, 'E'))
2375 warning ("ISO C89 does not support `%%E%c'", format_char);
2377 if (wide && index (fci->flag_chars, 'w') == 0)
2378 warning ("width used with `%c' format", format_char);
2379 if (index (fci->flag_chars, '3') != 0
2380 || (format_char == 'y' && index (flag_chars, 'E')))
2381 warning ("`%%%c' yields only last 2 digits of year in some locales",
2383 else if (index (fci->flag_chars, '2') != 0)
2384 warning ("`%%%c' yields only last 2 digits of year", format_char);
2385 if (precise && index (fci->flag_chars, 'p') == 0)
2386 warning ("precision used with `%c' format", format_char);
2387 if (aflag && index (fci->flag_chars, 'a') == 0)
2389 warning ("`a' flag used with `%c' format", format_char);
2390 /* To simplify the following code. */
2393 /* The a flag is a GNU extension. */
2394 else if (pedantic && aflag)
2395 warning ("ISO C does not support the `a' flag");
2396 if (info->format_type == scanf_format_type && format_char == '[')
2398 /* Skip over scan set, in case it happens to have '%' in it. */
2399 if (*format_chars == '^')
2401 /* Find closing bracket; if one is hit immediately, then
2402 it's part of the scan set rather than a terminator. */
2403 if (*format_chars == ']')
2405 while (*format_chars && *format_chars != ']')
2407 if (*format_chars != ']')
2408 /* The end of the format string was reached. */
2409 warning ("no closing `]' for `%%[' format");
2413 if (index (fci->flag_chars, '*') == 0)
2414 warning ("suppression of `%c' conversion in format", format_char);
2417 for (i = 0; flag_chars[i] != 0; ++i)
2419 if (index (fci->flag_chars, flag_chars[i]) == 0)
2420 warning ("flag `%c' used with type `%c'",
2421 flag_chars[i], format_char);
2423 if (info->format_type == strftime_format_type)
2425 if (precise && index (flag_chars, '0') != 0
2426 && (format_char == 'd' || format_char == 'i'
2427 || format_char == 'o' || format_char == 'u'
2428 || format_char == 'x' || format_char == 'X'))
2429 warning ("`0' flag ignored with precision specifier and `%c' format",
2431 wanted_type = (fci->types[length_chars_val].type
2432 ? *fci->types[length_chars_val].type : 0);
2433 wanted_type_name = fci->types[length_chars_val].name;
2434 wanted_type_std = fci->types[length_chars_val].std;
2435 if (wanted_type == 0)
2437 warning ("use of `%s' length modifier with `%c' type character",
2438 length_chars, format_char);
2439 /* Heuristic: skip one argument when an invalid length/type
2440 combination is encountered. */
2447 params = TREE_CHAIN (params);
2451 /* Warn if non-standard, provided it is more non-standard
2452 than the length and type characters that may already
2453 have been warned for. */
2454 && wanted_type_std > length_chars_std
2455 && wanted_type_std > fci->std)
2457 if (wanted_type_std == STD_EXT)
2458 warning ("ISO C does not support the `%%%s%c' %s format",
2459 length_chars, format_char, fki->name);
2460 else if ((wanted_type_std == STD_C99 && !flag_isoc99)
2461 || (wanted_type_std == STD_C94 && !flag_isoc94))
2462 warning ("ISO C89 does not support the `%%%s%c' %s format",
2463 length_chars, format_char, fki->name);
2466 /* Finally. . .check type of argument against desired type! */
2467 if (info->first_arg_num == 0)
2469 if (!(fci->pointer_count == 0 && wanted_type == void_type_node))
2476 cur_param = TREE_VALUE (params);
2477 params = TREE_CHAIN (params);
2479 main_wanted_type.wanted_type = wanted_type;
2480 main_wanted_type.wanted_type_name = wanted_type_name;
2481 main_wanted_type.pointer_count = fci->pointer_count + aflag;
2482 main_wanted_type.char_lenient_flag = 0;
2483 if (index (fci->flag_chars, 'c') != 0)
2484 main_wanted_type.char_lenient_flag = 1;
2485 main_wanted_type.writing_in_flag = 0;
2486 if (index (fci->flag_chars, 'W') != 0)
2487 main_wanted_type.writing_in_flag = 1;
2488 main_wanted_type.name = NULL;
2489 main_wanted_type.param = cur_param;
2490 main_wanted_type.arg_num = arg_num;
2491 main_wanted_type.next = NULL;
2492 if (last_wanted_type != 0)
2493 last_wanted_type->next = &main_wanted_type;
2494 if (first_wanted_type == 0)
2495 first_wanted_type = &main_wanted_type;
2496 last_wanted_type = &main_wanted_type;
2499 if (first_wanted_type != 0)
2500 check_format_types (first_wanted_type);
2506 /* Check the argument types from a single format conversion (possibly
2507 including width and precision arguments). */
2509 check_format_types (types)
2510 format_wanted_type *types;
2512 for (; types != 0; types = types->next)
2521 cur_param = types->param;
2522 cur_type = TREE_TYPE (cur_param);
2523 if (TREE_CODE (cur_type) == ERROR_MARK)
2526 wanted_type = types->wanted_type;
2527 arg_num = types->arg_num;
2529 /* The following should not occur here. */
2530 if (wanted_type == 0)
2532 if (wanted_type == void_type_node && types->pointer_count == 0)
2535 STRIP_NOPS (cur_param);
2537 /* Check the types of any additional pointer arguments
2538 that precede the "real" argument. */
2539 for (i = 0; i < types->pointer_count; ++i)
2541 if (TREE_CODE (cur_type) == POINTER_TYPE)
2543 cur_type = TREE_TYPE (cur_type);
2544 if (TREE_CODE (cur_type) == ERROR_MARK)
2547 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2548 cur_param = TREE_OPERAND (cur_param, 0);
2552 /* See if this is an attempt to write into a const type with
2553 scanf or with printf "%n". Note: the writing in happens
2554 at the first indirection only, if for example
2555 void * const * is passed to scanf %p; passing
2556 const void ** is simply passing an incompatible type. */
2557 if (types->writing_in_flag
2559 && (TYPE_READONLY (cur_type)
2561 && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
2562 || (DECL_P (cur_param)
2563 && TREE_READONLY (cur_param))))))
2564 warning ("writing into constant object (arg %d)", arg_num);
2566 /* If there are extra type qualifiers beyond the first
2567 indirection, then this makes the types technically
2571 && (TYPE_READONLY (cur_type)
2572 || TYPE_VOLATILE (cur_type)
2573 || TYPE_RESTRICT (cur_type)))
2574 warning ("extra type qualifiers in format argument (arg %d)",
2580 if (types->pointer_count == 1)
2581 warning ("format argument is not a pointer (arg %d)", arg_num);
2583 warning ("format argument is not a pointer to a pointer (arg %d)", arg_num);
2588 if (i < types->pointer_count)
2591 orig_cur_type = cur_type;
2592 cur_type = TYPE_MAIN_VARIANT (cur_type);
2594 /* Check whether the argument type is a character type. This leniency
2595 only applies to certain formats, flagged with 'c'.
2597 if (types->char_lenient_flag)
2598 char_type_flag = (cur_type == char_type_node
2599 || cur_type == signed_char_type_node
2600 || cur_type == unsigned_char_type_node);
2602 /* Check the type of the "real" argument, if there's a type we want. */
2603 if (wanted_type == cur_type)
2605 /* If we want `void *', allow any pointer type.
2606 (Anything else would already have got a warning.)
2607 With -pedantic, only allow pointers to void and to character
2609 if (wanted_type == void_type_node
2610 && (!pedantic || (i == 1 && char_type_flag)))
2612 /* Don't warn about differences merely in signedness, unless
2613 -pedantic. With -pedantic, warn if the type is a pointer
2614 target and not a character type, and for character types at
2615 a second level of indirection. */
2616 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2617 && TREE_CODE (cur_type) == INTEGER_TYPE
2618 && (! pedantic || i == 0 || (i == 1 && char_type_flag))
2619 && (TREE_UNSIGNED (wanted_type)
2620 ? wanted_type == unsigned_type (cur_type)
2621 : wanted_type == signed_type (cur_type)))
2623 /* Likewise, "signed char", "unsigned char" and "char" are
2624 equivalent but the above test won't consider them equivalent. */
2625 if (wanted_type == char_type_node
2626 && (! pedantic || i < 2)
2629 /* Now we have a type mismatch. */
2631 register const char *this;
2632 register const char *that;
2634 this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
2636 if (TYPE_NAME (orig_cur_type) != 0
2637 && TREE_CODE (orig_cur_type) != INTEGER_TYPE
2638 && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
2639 && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
2641 if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
2642 && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
2643 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
2645 that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
2648 /* A nameless type can't possibly match what the format wants.
2649 So there will be a warning for it.
2650 Make up a string to describe vaguely what it is. */
2653 if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
2656 that = "different type";
2659 /* Make the warning better in case of mismatch of int vs long. */
2660 if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
2661 && TREE_CODE (wanted_type) == INTEGER_TYPE
2662 && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
2663 && TYPE_NAME (orig_cur_type) != 0
2664 && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
2665 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
2667 if (strcmp (this, that) != 0)
2669 /* There may be a better name for the format, e.g. size_t,
2670 but we should allow for programs with a perverse typedef
2671 making size_t something other than what the compiler
2673 if (types->wanted_type_name != 0
2674 && strcmp (types->wanted_type_name, that) != 0)
2675 this = types->wanted_type_name;
2676 if (types->name != 0)
2677 warning ("%s is not type %s (arg %d)", types->name, this,
2680 warning ("%s format, %s arg (arg %d)", this, that, arg_num);
2686 /* Print a warning if a constant expression had overflow in folding.
2687 Invoke this function on every expression that the language
2688 requires to be a constant expression.
2689 Note the ANSI C standard says it is erroneous for a
2690 constant expression to overflow. */
2693 constant_expression_warning (value)
2696 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
2697 || TREE_CODE (value) == COMPLEX_CST)
2698 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
2699 pedwarn ("overflow in constant expression");
2702 /* Print a warning if an expression had overflow in folding.
2703 Invoke this function on every expression that
2704 (1) appears in the source code, and
2705 (2) might be a constant expression that overflowed, and
2706 (3) is not already checked by convert_and_check;
2707 however, do not invoke this function on operands of explicit casts. */
2710 overflow_warning (value)
2713 if ((TREE_CODE (value) == INTEGER_CST
2714 || (TREE_CODE (value) == COMPLEX_CST
2715 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
2716 && TREE_OVERFLOW (value))
2718 TREE_OVERFLOW (value) = 0;
2719 if (skip_evaluation == 0)
2720 warning ("integer overflow in expression");
2722 else if ((TREE_CODE (value) == REAL_CST
2723 || (TREE_CODE (value) == COMPLEX_CST
2724 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
2725 && TREE_OVERFLOW (value))
2727 TREE_OVERFLOW (value) = 0;
2728 if (skip_evaluation == 0)
2729 warning ("floating point overflow in expression");
2733 /* Print a warning if a large constant is truncated to unsigned,
2734 or if -Wconversion is used and a constant < 0 is converted to unsigned.
2735 Invoke this function on every expression that might be implicitly
2736 converted to an unsigned type. */
2739 unsigned_conversion_warning (result, operand)
2740 tree result, operand;
2742 if (TREE_CODE (operand) == INTEGER_CST
2743 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
2744 && TREE_UNSIGNED (TREE_TYPE (result))
2745 && skip_evaluation == 0
2746 && !int_fits_type_p (operand, TREE_TYPE (result)))
2748 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
2749 /* This detects cases like converting -129 or 256 to unsigned char. */
2750 warning ("large integer implicitly truncated to unsigned type");
2751 else if (warn_conversion)
2752 warning ("negative integer implicitly converted to unsigned type");
2756 /* Convert EXPR to TYPE, warning about conversion problems with constants.
2757 Invoke this function on every expression that is converted implicitly,
2758 i.e. because of language rules and not because of an explicit cast. */
2761 convert_and_check (type, expr)
2764 tree t = convert (type, expr);
2765 if (TREE_CODE (t) == INTEGER_CST)
2767 if (TREE_OVERFLOW (t))
2769 TREE_OVERFLOW (t) = 0;
2771 /* Do not diagnose overflow in a constant expression merely
2772 because a conversion overflowed. */
2773 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
2775 /* No warning for converting 0x80000000 to int. */
2776 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
2777 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
2778 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
2779 /* If EXPR fits in the unsigned version of TYPE,
2780 don't warn unless pedantic. */
2782 || TREE_UNSIGNED (type)
2783 || ! int_fits_type_p (expr, unsigned_type (type)))
2784 && skip_evaluation == 0)
2785 warning ("overflow in implicit constant conversion");
2788 unsigned_conversion_warning (t, expr);
2794 c_expand_expr_stmt (expr)
2797 /* Do default conversion if safe and possibly important,
2798 in case within ({...}). */
2799 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
2800 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
2801 expr = default_conversion (expr);
2803 if (TREE_TYPE (expr) != error_mark_node
2804 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
2805 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
2806 error ("expression statement has incomplete type");
2808 last_expr_type = TREE_TYPE (expr);
2809 add_stmt (build_stmt (EXPR_STMT, expr));
2812 /* Validate the expression after `case' and apply default promotions. */
2815 check_case_value (value)
2818 if (value == NULL_TREE)
2821 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
2822 STRIP_TYPE_NOPS (value);
2823 /* In C++, the following is allowed:
2826 switch (...) { case i: ... }
2828 So, we try to reduce the VALUE to a constant that way. */
2829 if (c_language == clk_cplusplus)
2831 value = decl_constant_value (value);
2832 STRIP_TYPE_NOPS (value);
2833 value = fold (value);
2836 if (TREE_CODE (value) != INTEGER_CST
2837 && value != error_mark_node)
2839 error ("case label does not reduce to an integer constant");
2840 value = error_mark_node;
2843 /* Promote char or short to int. */
2844 value = default_conversion (value);
2846 constant_expression_warning (value);
2851 /* Return an integer type with BITS bits of precision,
2852 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
2855 type_for_size (bits, unsignedp)
2859 if (bits == TYPE_PRECISION (integer_type_node))
2860 return unsignedp ? unsigned_type_node : integer_type_node;
2862 if (bits == TYPE_PRECISION (signed_char_type_node))
2863 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2865 if (bits == TYPE_PRECISION (short_integer_type_node))
2866 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2868 if (bits == TYPE_PRECISION (long_integer_type_node))
2869 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2871 if (bits == TYPE_PRECISION (long_long_integer_type_node))
2872 return (unsignedp ? long_long_unsigned_type_node
2873 : long_long_integer_type_node);
2875 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
2876 return (unsignedp ? widest_unsigned_literal_type_node
2877 : widest_integer_literal_type_node);
2879 if (bits <= TYPE_PRECISION (intQI_type_node))
2880 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2882 if (bits <= TYPE_PRECISION (intHI_type_node))
2883 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2885 if (bits <= TYPE_PRECISION (intSI_type_node))
2886 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2888 if (bits <= TYPE_PRECISION (intDI_type_node))
2889 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2894 /* Return a data type that has machine mode MODE.
2895 If the mode is an integer,
2896 then UNSIGNEDP selects between signed and unsigned types. */
2899 type_for_mode (mode, unsignedp)
2900 enum machine_mode mode;
2903 if (mode == TYPE_MODE (integer_type_node))
2904 return unsignedp ? unsigned_type_node : integer_type_node;
2906 if (mode == TYPE_MODE (signed_char_type_node))
2907 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2909 if (mode == TYPE_MODE (short_integer_type_node))
2910 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2912 if (mode == TYPE_MODE (long_integer_type_node))
2913 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2915 if (mode == TYPE_MODE (long_long_integer_type_node))
2916 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
2918 if (mode == TYPE_MODE (widest_integer_literal_type_node))
2919 return unsignedp ? widest_unsigned_literal_type_node
2920 : widest_integer_literal_type_node;
2922 if (mode == TYPE_MODE (intQI_type_node))
2923 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2925 if (mode == TYPE_MODE (intHI_type_node))
2926 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2928 if (mode == TYPE_MODE (intSI_type_node))
2929 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2931 if (mode == TYPE_MODE (intDI_type_node))
2932 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2934 #if HOST_BITS_PER_WIDE_INT >= 64
2935 if (mode == TYPE_MODE (intTI_type_node))
2936 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2939 if (mode == TYPE_MODE (float_type_node))
2940 return float_type_node;
2942 if (mode == TYPE_MODE (double_type_node))
2943 return double_type_node;
2945 if (mode == TYPE_MODE (long_double_type_node))
2946 return long_double_type_node;
2948 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
2949 return build_pointer_type (char_type_node);
2951 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
2952 return build_pointer_type (integer_type_node);
2954 #ifdef VECTOR_MODE_SUPPORTED_P
2955 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2956 return V4SF_type_node;
2957 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2958 return V4SI_type_node;
2959 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2960 return V2SI_type_node;
2961 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2962 return V4HI_type_node;
2963 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2964 return V8QI_type_node;
2970 /* Return an unsigned type the same as TYPE in other respects. */
2972 unsigned_type (type)
2975 tree type1 = TYPE_MAIN_VARIANT (type);
2976 if (type1 == signed_char_type_node || type1 == char_type_node)
2977 return unsigned_char_type_node;
2978 if (type1 == integer_type_node)
2979 return unsigned_type_node;
2980 if (type1 == short_integer_type_node)
2981 return short_unsigned_type_node;
2982 if (type1 == long_integer_type_node)
2983 return long_unsigned_type_node;
2984 if (type1 == long_long_integer_type_node)
2985 return long_long_unsigned_type_node;
2986 if (type1 == widest_integer_literal_type_node)
2987 return widest_unsigned_literal_type_node;
2988 #if HOST_BITS_PER_WIDE_INT >= 64
2989 if (type1 == intTI_type_node)
2990 return unsigned_intTI_type_node;
2992 if (type1 == intDI_type_node)
2993 return unsigned_intDI_type_node;
2994 if (type1 == intSI_type_node)
2995 return unsigned_intSI_type_node;
2996 if (type1 == intHI_type_node)
2997 return unsigned_intHI_type_node;
2998 if (type1 == intQI_type_node)
2999 return unsigned_intQI_type_node;
3001 return signed_or_unsigned_type (1, type);
3004 /* Return a signed type the same as TYPE in other respects. */
3010 tree type1 = TYPE_MAIN_VARIANT (type);
3011 if (type1 == unsigned_char_type_node || type1 == char_type_node)
3012 return signed_char_type_node;
3013 if (type1 == unsigned_type_node)
3014 return integer_type_node;
3015 if (type1 == short_unsigned_type_node)
3016 return short_integer_type_node;
3017 if (type1 == long_unsigned_type_node)
3018 return long_integer_type_node;
3019 if (type1 == long_long_unsigned_type_node)
3020 return long_long_integer_type_node;
3021 if (type1 == widest_unsigned_literal_type_node)
3022 return widest_integer_literal_type_node;
3023 #if HOST_BITS_PER_WIDE_INT >= 64
3024 if (type1 == unsigned_intTI_type_node)
3025 return intTI_type_node;
3027 if (type1 == unsigned_intDI_type_node)
3028 return intDI_type_node;
3029 if (type1 == unsigned_intSI_type_node)
3030 return intSI_type_node;
3031 if (type1 == unsigned_intHI_type_node)
3032 return intHI_type_node;
3033 if (type1 == unsigned_intQI_type_node)
3034 return intQI_type_node;
3036 return signed_or_unsigned_type (0, type);
3039 /* Return a type the same as TYPE except unsigned or
3040 signed according to UNSIGNEDP. */
3043 signed_or_unsigned_type (unsignedp, type)
3047 if (! INTEGRAL_TYPE_P (type)
3048 || TREE_UNSIGNED (type) == unsignedp)
3051 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
3052 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3053 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
3054 return unsignedp ? unsigned_type_node : integer_type_node;
3055 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
3056 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3057 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
3058 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3059 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
3060 return (unsignedp ? long_long_unsigned_type_node
3061 : long_long_integer_type_node);
3062 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
3063 return (unsignedp ? widest_unsigned_literal_type_node
3064 : widest_integer_literal_type_node);
3068 /* Return the minimum number of bits needed to represent VALUE in a
3069 signed or unsigned type, UNSIGNEDP says which. */
3072 min_precision (value, unsignedp)
3078 /* If the value is negative, compute its negative minus 1. The latter
3079 adjustment is because the absolute value of the largest negative value
3080 is one larger than the largest positive value. This is equivalent to
3081 a bit-wise negation, so use that operation instead. */
3083 if (tree_int_cst_sgn (value) < 0)
3084 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
3086 /* Return the number of bits needed, taking into account the fact
3087 that we need one more bit for a signed than unsigned type. */
3089 if (integer_zerop (value))
3092 log = tree_floor_log2 (value);
3094 return log + 1 + ! unsignedp;
3097 /* Print an error message for invalid operands to arith operation CODE.
3098 NOP_EXPR is used as a special case (see truthvalue_conversion). */
3101 binary_op_error (code)
3102 enum tree_code code;
3104 register const char *opname;
3109 error ("invalid truth-value expression");
3113 opname = "+"; break;
3115 opname = "-"; break;
3117 opname = "*"; break;
3119 opname = "max"; break;
3121 opname = "min"; break;
3123 opname = "=="; break;
3125 opname = "!="; break;
3127 opname = "<="; break;
3129 opname = ">="; break;
3131 opname = "<"; break;
3133 opname = ">"; break;
3135 opname = "<<"; break;
3137 opname = ">>"; break;
3138 case TRUNC_MOD_EXPR:
3139 case FLOOR_MOD_EXPR:
3140 opname = "%"; break;
3141 case TRUNC_DIV_EXPR:
3142 case FLOOR_DIV_EXPR:
3143 opname = "/"; break;
3145 opname = "&"; break;
3147 opname = "|"; break;
3148 case TRUTH_ANDIF_EXPR:
3149 opname = "&&"; break;
3150 case TRUTH_ORIF_EXPR:
3151 opname = "||"; break;
3153 opname = "^"; break;
3156 opname = "rotate"; break;
3158 opname = "unknown"; break;
3160 error ("invalid operands to binary %s", opname);
3163 /* Subroutine of build_binary_op, used for comparison operations.
3164 See if the operands have both been converted from subword integer types
3165 and, if so, perhaps change them both back to their original type.
3166 This function is also responsible for converting the two operands
3167 to the proper common type for comparison.
3169 The arguments of this function are all pointers to local variables
3170 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
3171 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
3173 If this function returns nonzero, it means that the comparison has
3174 a constant value. What this function returns is an expression for
3178 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
3179 tree *op0_ptr, *op1_ptr;
3181 enum tree_code *rescode_ptr;
3184 tree op0 = *op0_ptr;
3185 tree op1 = *op1_ptr;
3186 int unsignedp0, unsignedp1;
3188 tree primop0, primop1;
3189 enum tree_code code = *rescode_ptr;
3191 /* Throw away any conversions to wider types
3192 already present in the operands. */
3194 primop0 = get_narrower (op0, &unsignedp0);
3195 primop1 = get_narrower (op1, &unsignedp1);
3197 /* Handle the case that OP0 does not *contain* a conversion
3198 but it *requires* conversion to FINAL_TYPE. */
3200 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
3201 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
3202 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
3203 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
3205 /* If one of the operands must be floated, we cannot optimize. */
3206 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
3207 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
3209 /* If first arg is constant, swap the args (changing operation
3210 so value is preserved), for canonicalization. Don't do this if
3211 the second arg is 0. */
3213 if (TREE_CONSTANT (primop0)
3214 && ! integer_zerop (primop1) && ! real_zerop (primop1))
3216 register tree tem = primop0;
3217 register int temi = unsignedp0;
3225 unsignedp0 = unsignedp1;
3248 *rescode_ptr = code;
3251 /* If comparing an integer against a constant more bits wide,
3252 maybe we can deduce a value of 1 or 0 independent of the data.
3253 Or else truncate the constant now
3254 rather than extend the variable at run time.
3256 This is only interesting if the constant is the wider arg.
3257 Also, it is not safe if the constant is unsigned and the
3258 variable arg is signed, since in this case the variable
3259 would be sign-extended and then regarded as unsigned.
3260 Our technique fails in this case because the lowest/highest
3261 possible unsigned results don't follow naturally from the
3262 lowest/highest possible values of the variable operand.
3263 For just EQ_EXPR and NE_EXPR there is another technique that
3264 could be used: see if the constant can be faithfully represented
3265 in the other operand's type, by truncating it and reextending it
3266 and see if that preserves the constant's value. */
3268 if (!real1 && !real2
3269 && TREE_CODE (primop1) == INTEGER_CST
3270 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
3272 int min_gt, max_gt, min_lt, max_lt;
3273 tree maxval, minval;
3274 /* 1 if comparison is nominally unsigned. */
3275 int unsignedp = TREE_UNSIGNED (*restype_ptr);
3278 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
3280 /* If TYPE is an enumeration, then we need to get its min/max
3281 values from it's underlying integral type, not the enumerated
3283 if (TREE_CODE (type) == ENUMERAL_TYPE)
3284 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
3286 maxval = TYPE_MAX_VALUE (type);
3287 minval = TYPE_MIN_VALUE (type);
3289 if (unsignedp && !unsignedp0)
3290 *restype_ptr = signed_type (*restype_ptr);
3292 if (TREE_TYPE (primop1) != *restype_ptr)
3293 primop1 = convert (*restype_ptr, primop1);
3294 if (type != *restype_ptr)
3296 minval = convert (*restype_ptr, minval);
3297 maxval = convert (*restype_ptr, maxval);
3300 if (unsignedp && unsignedp0)
3302 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
3303 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
3304 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
3305 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
3309 min_gt = INT_CST_LT (primop1, minval);
3310 max_gt = INT_CST_LT (primop1, maxval);
3311 min_lt = INT_CST_LT (minval, primop1);
3312 max_lt = INT_CST_LT (maxval, primop1);
3316 /* This used to be a switch, but Genix compiler can't handle that. */
3317 if (code == NE_EXPR)
3319 if (max_lt || min_gt)
3320 val = boolean_true_node;
3322 else if (code == EQ_EXPR)
3324 if (max_lt || min_gt)
3325 val = boolean_false_node;
3327 else if (code == LT_EXPR)
3330 val = boolean_true_node;
3332 val = boolean_false_node;
3334 else if (code == GT_EXPR)
3337 val = boolean_true_node;
3339 val = boolean_false_node;
3341 else if (code == LE_EXPR)
3344 val = boolean_true_node;
3346 val = boolean_false_node;
3348 else if (code == GE_EXPR)
3351 val = boolean_true_node;
3353 val = boolean_false_node;
3356 /* If primop0 was sign-extended and unsigned comparison specd,
3357 we did a signed comparison above using the signed type bounds.
3358 But the comparison we output must be unsigned.
3360 Also, for inequalities, VAL is no good; but if the signed
3361 comparison had *any* fixed result, it follows that the
3362 unsigned comparison just tests the sign in reverse
3363 (positive values are LE, negative ones GE).
3364 So we can generate an unsigned comparison
3365 against an extreme value of the signed type. */
3367 if (unsignedp && !unsignedp0)
3374 primop1 = TYPE_MIN_VALUE (type);
3380 primop1 = TYPE_MAX_VALUE (type);
3387 type = unsigned_type (type);
3390 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3392 /* This is the case of (char)x >?< 0x80, which people used to use
3393 expecting old C compilers to change the 0x80 into -0x80. */
3394 if (val == boolean_false_node)
3395 warning ("comparison is always false due to limited range of data type");
3396 if (val == boolean_true_node)
3397 warning ("comparison is always true due to limited range of data type");
3400 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3402 /* This is the case of (unsigned char)x >?< -1 or < 0. */
3403 if (val == boolean_false_node)
3404 warning ("comparison is always false due to limited range of data type");
3405 if (val == boolean_true_node)
3406 warning ("comparison is always true due to limited range of data type");
3411 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3412 if (TREE_SIDE_EFFECTS (primop0))
3413 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
3417 /* Value is not predetermined, but do the comparison
3418 in the type of the operand that is not constant.
3419 TYPE is already properly set. */
3421 else if (real1 && real2
3422 && (TYPE_PRECISION (TREE_TYPE (primop0))
3423 == TYPE_PRECISION (TREE_TYPE (primop1))))
3424 type = TREE_TYPE (primop0);
3426 /* If args' natural types are both narrower than nominal type
3427 and both extend in the same manner, compare them
3428 in the type of the wider arg.
3429 Otherwise must actually extend both to the nominal
3430 common type lest different ways of extending
3432 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
3434 else if (unsignedp0 == unsignedp1 && real1 == real2
3435 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
3436 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
3438 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3439 type = signed_or_unsigned_type (unsignedp0
3440 || TREE_UNSIGNED (*restype_ptr),
3442 /* Make sure shorter operand is extended the right way
3443 to match the longer operand. */
3444 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
3446 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
3451 /* Here we must do the comparison on the nominal type
3452 using the args exactly as we received them. */
3453 type = *restype_ptr;
3457 if (!real1 && !real2 && integer_zerop (primop1)
3458 && TREE_UNSIGNED (*restype_ptr))
3464 /* All unsigned values are >= 0, so we warn if extra warnings
3465 are requested. However, if OP0 is a constant that is
3466 >= 0, the signedness of the comparison isn't an issue,
3467 so suppress the warning. */
3468 if (extra_warnings && !in_system_header
3469 && ! (TREE_CODE (primop0) == INTEGER_CST
3470 && ! TREE_OVERFLOW (convert (signed_type (type),
3472 warning ("comparison of unsigned expression >= 0 is always true");
3473 value = boolean_true_node;
3477 if (extra_warnings && !in_system_header
3478 && ! (TREE_CODE (primop0) == INTEGER_CST
3479 && ! TREE_OVERFLOW (convert (signed_type (type),
3481 warning ("comparison of unsigned expression < 0 is always false");
3482 value = boolean_false_node;
3491 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3492 if (TREE_SIDE_EFFECTS (primop0))
3493 return build (COMPOUND_EXPR, TREE_TYPE (value),
3500 *op0_ptr = convert (type, primop0);
3501 *op1_ptr = convert (type, primop1);
3503 *restype_ptr = boolean_type_node;
3508 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
3509 or validate its data type for an `if' or `while' statement or ?..: exp.
3511 This preparation consists of taking the ordinary
3512 representation of an expression expr and producing a valid tree
3513 boolean expression describing whether expr is nonzero. We could
3514 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
3515 but we optimize comparisons, &&, ||, and !.
3517 The resulting type should always be `boolean_type_node'. */
3520 truthvalue_conversion (expr)
3523 if (TREE_CODE (expr) == ERROR_MARK)
3526 #if 0 /* This appears to be wrong for C++. */
3527 /* These really should return error_mark_node after 2.4 is stable.
3528 But not all callers handle ERROR_MARK properly. */
3529 switch (TREE_CODE (TREE_TYPE (expr)))
3532 error ("struct type value used where scalar is required");
3533 return boolean_false_node;
3536 error ("union type value used where scalar is required");
3537 return boolean_false_node;
3540 error ("array type value used where scalar is required");
3541 return boolean_false_node;
3548 switch (TREE_CODE (expr))
3551 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3552 case TRUTH_ANDIF_EXPR:
3553 case TRUTH_ORIF_EXPR:
3554 case TRUTH_AND_EXPR:
3556 case TRUTH_XOR_EXPR:
3557 case TRUTH_NOT_EXPR:
3558 TREE_TYPE (expr) = boolean_type_node;
3565 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
3568 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
3571 /* If we are taking the address of a external decl, it might be zero
3572 if it is weak, so we cannot optimize. */
3573 if (DECL_P (TREE_OPERAND (expr, 0))
3574 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
3577 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
3578 return build (COMPOUND_EXPR, boolean_type_node,
3579 TREE_OPERAND (expr, 0), boolean_true_node);
3581 return boolean_true_node;
3584 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
3585 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3586 truthvalue_conversion (TREE_OPERAND (expr, 0)),
3587 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3594 /* These don't change whether an object is non-zero or zero. */
3595 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3599 /* These don't change whether an object is zero or non-zero, but
3600 we can't ignore them if their second arg has side-effects. */
3601 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
3602 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
3603 truthvalue_conversion (TREE_OPERAND (expr, 0)));
3605 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3608 /* Distribute the conversion into the arms of a COND_EXPR. */
3609 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
3610 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3611 truthvalue_conversion (TREE_OPERAND (expr, 2))));
3614 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
3615 since that affects how `default_conversion' will behave. */
3616 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
3617 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
3619 /* fall through... */
3621 /* If this is widening the argument, we can ignore it. */
3622 if (TYPE_PRECISION (TREE_TYPE (expr))
3623 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
3624 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3628 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
3630 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
3631 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
3633 /* fall through... */
3635 /* This and MINUS_EXPR can be changed into a comparison of the
3637 if (TREE_TYPE (TREE_OPERAND (expr, 0))
3638 == TREE_TYPE (TREE_OPERAND (expr, 1)))
3639 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3640 TREE_OPERAND (expr, 1), 1);
3641 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3642 fold (build1 (NOP_EXPR,
3643 TREE_TYPE (TREE_OPERAND (expr, 0)),
3644 TREE_OPERAND (expr, 1))), 1);
3647 if (integer_onep (TREE_OPERAND (expr, 1))
3648 && TREE_TYPE (expr) != boolean_type_node)
3649 /* Using convert here would cause infinite recursion. */
3650 return build1 (NOP_EXPR, boolean_type_node, expr);
3654 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
3655 warning ("suggest parentheses around assignment used as truth value");
3662 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
3664 tree tem = save_expr (expr);
3665 return (build_binary_op
3666 ((TREE_SIDE_EFFECTS (expr)
3667 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3668 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
3669 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
3673 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
3677 /* Read the rest of a #-directive from input stream FINPUT.
3678 In normal use, the directive name and the white space after it
3679 have already been read, so they won't be included in the result.
3680 We allow for the fact that the directive line may contain
3681 a newline embedded within a character or string literal which forms
3682 a part of the directive.
3684 The value is a string in a reusable buffer. It remains valid
3685 only until the next time this function is called.
3687 The terminating character ('\n' or EOF) is left in FINPUT for the
3688 caller to re-read. */
3691 get_directive_line (finput)
3692 register FILE *finput;
3694 static char *directive_buffer = NULL;
3695 static unsigned buffer_length = 0;
3697 register char *buffer_limit;
3698 register int looking_for = 0;
3699 register int char_escaped = 0;
3701 if (buffer_length == 0)
3703 directive_buffer = (char *)xmalloc (128);
3704 buffer_length = 128;
3707 buffer_limit = &directive_buffer[buffer_length];
3709 for (p = directive_buffer; ; )
3713 /* Make buffer bigger if it is full. */
3714 if (p >= buffer_limit)
3716 register unsigned bytes_used = (p - directive_buffer);
3720 = (char *)xrealloc (directive_buffer, buffer_length);
3721 p = &directive_buffer[bytes_used];
3722 buffer_limit = &directive_buffer[buffer_length];
3727 /* Discard initial whitespace. */
3728 if ((c == ' ' || c == '\t') && p == directive_buffer)
3731 /* Detect the end of the directive. */
3732 if (looking_for == 0
3733 && (c == '\n' || c == EOF))
3742 return directive_buffer;
3744 /* Handle string and character constant syntax. */
3747 if (looking_for == c && !char_escaped)
3748 looking_for = 0; /* Found terminator... stop looking. */
3751 if (c == '\'' || c == '"')
3752 looking_for = c; /* Don't stop buffering until we see another
3753 one of these (or an EOF). */
3755 /* Handle backslash. */
3756 char_escaped = (c == '\\' && ! char_escaped);
3759 #endif /* USE_CPPLIB */
3761 /* Make a variant type in the proper way for C/C++, propagating qualifiers
3762 down to the element type of an array. */
3765 c_build_qualified_type (type, type_quals)
3769 /* A restrict-qualified pointer type must be a pointer to object or
3770 incomplete type. Note that the use of POINTER_TYPE_P also allows
3771 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
3772 the C++ front-end also use POINTER_TYPE for pointer-to-member
3773 values, so even though it should be illegal to use `restrict'
3774 with such an entity we don't flag that here. Thus, special case
3775 code for that case is required in the C++ front-end. */
3776 if ((type_quals & TYPE_QUAL_RESTRICT)
3777 && (!POINTER_TYPE_P (type)
3778 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
3780 error ("invalid use of `restrict'");
3781 type_quals &= ~TYPE_QUAL_RESTRICT;
3784 if (TREE_CODE (type) == ARRAY_TYPE)
3785 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
3787 TYPE_DOMAIN (type));
3788 return build_qualified_type (type, type_quals);
3791 /* Apply the TYPE_QUALS to the new DECL. */
3794 c_apply_type_quals_to_decl (type_quals, decl)
3798 if ((type_quals & TYPE_QUAL_CONST)
3799 || (TREE_TYPE (decl)
3800 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
3801 TREE_READONLY (decl) = 1;
3802 if (type_quals & TYPE_QUAL_VOLATILE)
3804 TREE_SIDE_EFFECTS (decl) = 1;
3805 TREE_THIS_VOLATILE (decl) = 1;
3807 if (type_quals & TYPE_QUAL_RESTRICT)
3809 if (!TREE_TYPE (decl)
3810 || !POINTER_TYPE_P (TREE_TYPE (decl))
3811 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
3812 error ("invalid use of `restrict'");
3813 else if (flag_strict_aliasing)
3815 /* No two restricted pointers can point at the same thing.
3816 However, a restricted pointer can point at the same thing
3817 as an unrestricted pointer, if that unrestricted pointer
3818 is based on the restricted pointer. So, we make the
3819 alias set for the restricted pointer a subset of the
3820 alias set for the type pointed to by the type of the
3823 HOST_WIDE_INT pointed_to_alias_set
3824 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
3826 if (pointed_to_alias_set == 0)
3827 /* It's not legal to make a subset of alias set zero. */
3831 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
3832 record_alias_subset (pointed_to_alias_set,
3833 DECL_POINTER_ALIAS_SET (decl));
3840 /* Return the typed-based alias set for T, which may be an expression
3841 or a type. Return -1 if we don't do anything special. */
3844 lang_get_alias_set (t)
3849 /* Permit type-punning when accessing a union, provided the access
3850 is directly through the union. For example, this code does not
3851 permit taking the address of a union member and then storing
3852 through it. Even the type-punning allowed here is a GCC
3853 extension, albeit a common and useful one; the C standard says
3854 that such accesses have implementation-defined behavior. */
3856 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
3857 u = TREE_OPERAND (u, 0))
3858 if (TREE_CODE (u) == COMPONENT_REF
3859 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
3862 /* If this is a char *, the ANSI C standard says it can alias
3863 anything. Note that all references need do this. */
3864 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
3865 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
3866 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
3869 /* That's all the expressions we handle specially. */
3873 /* The C standard specifically allows aliasing between signed and
3874 unsigned variants of the same type. We treat the signed
3875 variant as canonical. */
3876 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
3878 tree t1 = signed_type (t);
3880 /* t1 == t can happen for boolean nodes which are always unsigned. */
3882 return get_alias_set (t1);
3884 else if (POINTER_TYPE_P (t))
3888 /* Unfortunately, there is no canonical form of a pointer type.
3889 In particular, if we have `typedef int I', then `int *', and
3890 `I *' are different types. So, we have to pick a canonical
3891 representative. We do this below.
3893 Technically, this approach is actually more conservative that
3894 it needs to be. In particular, `const int *' and `int *'
3895 chould be in different alias sets, according to the C and C++
3896 standard, since their types are not the same, and so,
3897 technically, an `int **' and `const int **' cannot point at
3900 But, the standard is wrong. In particular, this code is
3905 const int* const* cipp = &ip;
3907 And, it doesn't make sense for that to be legal unless you
3908 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
3909 the pointed-to types. This issue has been reported to the
3911 t1 = TYPE_MAIN_VARIANT (TREE_TYPE (t));
3912 t1 = ((TREE_CODE (t) == POINTER_TYPE)
3913 ? build_pointer_type (t1) : build_reference_type (t1));
3915 return get_alias_set (t1);
3917 /* It's not yet safe to use alias sets for classes in C++ because
3918 the TYPE_FIELDs list for a class doesn't mention base classes. */
3919 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
3925 /* Build tree nodes and builtin functions common to both C and C++ language
3927 CPLUS_MODE is nonzero if we are called from the C++ frontend, we generate
3928 some stricter prototypes in that case.
3929 NO_BUILTINS and NO_NONANSI_BUILTINS contain the respective values of
3930 the language frontend flags flag_no_builtin and
3931 flag_no_nonansi_builtin. */
3934 c_common_nodes_and_builtins (cplus_mode, no_builtins, no_nonansi_builtins)
3935 int cplus_mode, no_builtins, no_nonansi_builtins;
3938 tree memcpy_ftype, memset_ftype, strlen_ftype;
3939 tree bzero_ftype, bcmp_ftype;
3940 tree endlink, int_endlink, double_endlink, unsigned_endlink;
3941 tree sizetype_endlink;
3942 tree ptr_ftype, ptr_ftype_unsigned;
3943 tree void_ftype_any, void_ftype_int, int_ftype_any;
3944 tree double_ftype_double, double_ftype_double_double;
3945 tree float_ftype_float, ldouble_ftype_ldouble;
3946 tree int_ftype_cptr_cptr_sizet;
3947 tree int_ftype_string_string, string_ftype_ptr_ptr;
3948 tree long_ftype_long;
3949 /* Either char* or void*. */
3950 tree traditional_ptr_type_node;
3951 /* Either const char* or const void*. */
3952 tree traditional_cptr_type_node;
3953 tree traditional_len_type_node;
3954 tree traditional_len_endlink;
3955 tree va_list_ref_type_node;
3956 tree va_list_arg_type_node;
3958 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
3959 va_list_type_node));
3961 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
3962 ptrdiff_type_node));
3964 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
3967 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
3969 va_list_arg_type_node = va_list_ref_type_node =
3970 build_pointer_type (TREE_TYPE (va_list_type_node));
3974 va_list_arg_type_node = va_list_type_node;
3975 va_list_ref_type_node = build_reference_type (va_list_type_node);
3978 endlink = void_list_node;
3979 int_endlink = tree_cons (NULL_TREE, integer_type_node, endlink);
3980 double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
3981 unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
3983 ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
3984 ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
3985 sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
3986 /* We realloc here because sizetype could be int or unsigned. S'ok. */
3987 ptr_ftype_sizetype = build_function_type (ptr_type_node, sizetype_endlink);
3989 int_ftype_any = build_function_type (integer_type_node, NULL_TREE);
3990 void_ftype_any = build_function_type (void_type_node, NULL_TREE);
3991 void_ftype = build_function_type (void_type_node, endlink);
3992 void_ftype_int = build_function_type (void_type_node, int_endlink);
3994 = build_function_type (void_type_node,
3995 tree_cons (NULL_TREE, ptr_type_node, endlink));
3998 = build_function_type (float_type_node,
3999 tree_cons (NULL_TREE, float_type_node, endlink));
4002 = build_function_type (double_type_node, double_endlink);
4004 ldouble_ftype_ldouble
4005 = build_function_type (long_double_type_node,
4006 tree_cons (NULL_TREE, long_double_type_node,
4009 double_ftype_double_double
4010 = build_function_type (double_type_node,
4011 tree_cons (NULL_TREE, double_type_node,
4015 = build_function_type (integer_type_node, int_endlink);
4018 = build_function_type (long_integer_type_node,
4019 tree_cons (NULL_TREE, long_integer_type_node,
4022 int_ftype_cptr_cptr_sizet
4023 = build_function_type (integer_type_node,
4024 tree_cons (NULL_TREE, const_ptr_type_node,
4025 tree_cons (NULL_TREE, const_ptr_type_node,
4026 tree_cons (NULL_TREE,
4030 void_zero_node = build_int_2 (0, 0);
4031 TREE_TYPE (void_zero_node) = void_type_node;
4033 /* Prototype for strcpy. */
4034 string_ftype_ptr_ptr
4035 = build_function_type (string_type_node,
4036 tree_cons (NULL_TREE, string_type_node,
4037 tree_cons (NULL_TREE,
4038 const_string_type_node,
4041 traditional_len_type_node = (flag_traditional && ! cplus_mode
4042 ? integer_type_node : sizetype);
4043 traditional_len_endlink = tree_cons (NULL_TREE, traditional_len_type_node,
4046 /* Prototype for strcmp. */
4047 int_ftype_string_string
4048 = build_function_type (integer_type_node,
4049 tree_cons (NULL_TREE, const_string_type_node,
4050 tree_cons (NULL_TREE,
4051 const_string_type_node,
4054 /* Prototype for strlen. */
4056 = build_function_type (traditional_len_type_node,
4057 tree_cons (NULL_TREE, const_string_type_node,
4060 traditional_ptr_type_node = (flag_traditional && ! cplus_mode
4061 ? string_type_node : ptr_type_node);
4062 traditional_cptr_type_node = (flag_traditional && ! cplus_mode
4063 ? const_string_type_node : const_ptr_type_node);
4065 /* Prototype for memcpy. */
4067 = build_function_type (traditional_ptr_type_node,
4068 tree_cons (NULL_TREE, ptr_type_node,
4069 tree_cons (NULL_TREE, const_ptr_type_node,
4070 sizetype_endlink)));
4072 /* Prototype for memset. */
4074 = build_function_type (traditional_ptr_type_node,
4075 tree_cons (NULL_TREE, ptr_type_node,
4076 tree_cons (NULL_TREE, integer_type_node,
4077 tree_cons (NULL_TREE,
4081 /* Prototype for bzero. */
4083 = build_function_type (void_type_node,
4084 tree_cons (NULL_TREE, traditional_ptr_type_node,
4085 traditional_len_endlink));
4087 /* Prototype for bcmp. */
4089 = build_function_type (integer_type_node,
4090 tree_cons (NULL_TREE, traditional_cptr_type_node,
4091 tree_cons (NULL_TREE,
4092 traditional_cptr_type_node,
4093 traditional_len_endlink)));
4095 builtin_function ("__builtin_constant_p", default_function_type,
4096 BUILT_IN_CONSTANT_P, BUILT_IN_NORMAL, NULL_PTR);
4098 builtin_function ("__builtin_return_address", ptr_ftype_unsigned,
4099 BUILT_IN_RETURN_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4101 builtin_function ("__builtin_frame_address", ptr_ftype_unsigned,
4102 BUILT_IN_FRAME_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4104 builtin_function ("__builtin_alloca", ptr_ftype_sizetype,
4105 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, "alloca");
4106 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS,
4107 BUILT_IN_NORMAL, NULL_PTR);
4108 /* Define alloca, ffs as builtins.
4109 Declare _exit just to mark it as volatile. */
4110 if (! no_builtins && ! no_nonansi_builtins)
4113 temp = builtin_function ("alloca", ptr_ftype_sizetype,
4114 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
4115 /* Suppress error if redefined as a non-function. */
4116 DECL_BUILT_IN_NONANSI (temp) = 1;
4118 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
4119 BUILT_IN_NORMAL, NULL_PTR);
4120 /* Suppress error if redefined as a non-function. */
4121 DECL_BUILT_IN_NONANSI (temp) = 1;
4122 temp = builtin_function ("_exit", void_ftype_int,
4123 0, NOT_BUILT_IN, NULL_PTR);
4124 TREE_THIS_VOLATILE (temp) = 1;
4125 TREE_SIDE_EFFECTS (temp) = 1;
4126 /* Suppress error if redefined as a non-function. */
4127 DECL_BUILT_IN_NONANSI (temp) = 1;
4129 /* The system prototypes for these functions have many
4130 variations, so don't specify parameters to avoid conflicts.
4131 The expand_* functions check the argument types anyway. */
4132 temp = builtin_function ("bzero", void_ftype_any,
4133 BUILT_IN_BZERO, BUILT_IN_NORMAL, NULL_PTR);
4134 DECL_BUILT_IN_NONANSI (temp) = 1;
4135 temp = builtin_function ("bcmp", int_ftype_any,
4136 BUILT_IN_BCMP, BUILT_IN_NORMAL, NULL_PTR);
4137 DECL_BUILT_IN_NONANSI (temp) = 1;
4140 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS,
4141 BUILT_IN_NORMAL, NULL_PTR);
4142 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
4143 BUILT_IN_NORMAL, NULL_PTR);
4144 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
4145 BUILT_IN_NORMAL, NULL_PTR);
4146 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4147 BUILT_IN_NORMAL, NULL_PTR);
4148 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
4149 BUILT_IN_NORMAL, NULL_PTR);
4150 builtin_function ("__builtin_saveregs", ptr_ftype, BUILT_IN_SAVEREGS,
4151 BUILT_IN_NORMAL, NULL_PTR);
4152 builtin_function ("__builtin_classify_type", default_function_type,
4153 BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
4154 builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
4155 BUILT_IN_NORMAL, NULL_PTR);
4156 builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
4157 BUILT_IN_NORMAL, NULL_PTR);
4158 builtin_function ("__builtin_setjmp",
4159 build_function_type (integer_type_node,
4160 tree_cons (NULL_TREE, ptr_type_node,
4162 BUILT_IN_SETJMP, BUILT_IN_NORMAL, NULL_PTR);
4163 builtin_function ("__builtin_longjmp",
4164 build_function_type (void_type_node,
4165 tree_cons (NULL_TREE, ptr_type_node,
4166 tree_cons (NULL_TREE,
4169 BUILT_IN_LONGJMP, BUILT_IN_NORMAL, NULL_PTR);
4170 builtin_function ("__builtin_trap", void_ftype, BUILT_IN_TRAP,
4171 BUILT_IN_NORMAL, NULL_PTR);
4173 /* ISO C99 IEEE Unordered compares. */
4174 builtin_function ("__builtin_isgreater", default_function_type,
4175 BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
4176 builtin_function ("__builtin_isgreaterequal", default_function_type,
4177 BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
4178 builtin_function ("__builtin_isless", default_function_type,
4179 BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
4180 builtin_function ("__builtin_islessequal", default_function_type,
4181 BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
4182 builtin_function ("__builtin_islessgreater", default_function_type,
4183 BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
4184 builtin_function ("__builtin_isunordered", default_function_type,
4185 BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
4187 /* Untyped call and return. */
4188 builtin_function ("__builtin_apply_args", ptr_ftype,
4189 BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
4191 temp = tree_cons (NULL_TREE,
4192 build_pointer_type (build_function_type (void_type_node,
4194 tree_cons (NULL_TREE,
4196 tree_cons (NULL_TREE,
4199 builtin_function ("__builtin_apply",
4200 build_function_type (ptr_type_node, temp),
4201 BUILT_IN_APPLY, BUILT_IN_NORMAL, NULL_PTR);
4202 builtin_function ("__builtin_return", void_ftype_ptr,
4203 BUILT_IN_RETURN, BUILT_IN_NORMAL, NULL_PTR);
4205 /* Support for varargs.h and stdarg.h. */
4206 builtin_function ("__builtin_varargs_start",
4207 build_function_type (void_type_node,
4208 tree_cons (NULL_TREE,
4209 va_list_ref_type_node,
4211 BUILT_IN_VARARGS_START, BUILT_IN_NORMAL, NULL_PTR);
4213 builtin_function ("__builtin_stdarg_start",
4214 build_function_type (void_type_node,
4215 tree_cons (NULL_TREE,
4216 va_list_ref_type_node,
4218 BUILT_IN_STDARG_START, BUILT_IN_NORMAL, NULL_PTR);
4220 builtin_function ("__builtin_va_end",
4221 build_function_type (void_type_node,
4222 tree_cons (NULL_TREE,
4223 va_list_ref_type_node,
4225 BUILT_IN_VA_END, BUILT_IN_NORMAL, NULL_PTR);
4227 builtin_function ("__builtin_va_copy",
4228 build_function_type (void_type_node,
4229 tree_cons (NULL_TREE,
4230 va_list_ref_type_node,
4231 tree_cons (NULL_TREE,
4232 va_list_arg_type_node,
4234 BUILT_IN_VA_COPY, BUILT_IN_NORMAL, NULL_PTR);
4236 /* ??? Ought to be `T __builtin_expect(T, T)' for any type T. */
4237 builtin_function ("__builtin_expect",
4238 build_function_type (long_integer_type_node,
4239 tree_cons (NULL_TREE,
4240 long_integer_type_node,
4241 tree_cons (NULL_TREE,
4242 long_integer_type_node,
4244 BUILT_IN_EXPECT, BUILT_IN_NORMAL, NULL_PTR);
4246 /* Currently under experimentation. */
4247 builtin_function ("__builtin_memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4248 BUILT_IN_NORMAL, "memcpy");
4249 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
4250 BUILT_IN_MEMCMP, BUILT_IN_NORMAL, "memcmp");
4251 builtin_function ("__builtin_memset", memset_ftype,
4252 BUILT_IN_MEMSET, BUILT_IN_NORMAL, "memset");
4253 builtin_function ("__builtin_bzero", bzero_ftype,
4254 BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
4255 builtin_function ("__builtin_bcmp", bcmp_ftype,
4256 BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");
4257 builtin_function ("__builtin_strcmp", int_ftype_string_string,
4258 BUILT_IN_STRCMP, BUILT_IN_NORMAL, "strcmp");
4259 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
4260 BUILT_IN_STRCPY, BUILT_IN_NORMAL, "strcpy");
4261 builtin_function ("__builtin_strlen", strlen_ftype,
4262 BUILT_IN_STRLEN, BUILT_IN_NORMAL, "strlen");
4263 builtin_function ("__builtin_sqrtf", float_ftype_float,
4264 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtf");
4265 builtin_function ("__builtin_fsqrt", double_ftype_double,
4266 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrt");
4267 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
4268 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtl");
4269 builtin_function ("__builtin_sinf", float_ftype_float,
4270 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinf");
4271 builtin_function ("__builtin_sin", double_ftype_double,
4272 BUILT_IN_SIN, BUILT_IN_NORMAL, "sin");
4273 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
4274 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinl");
4275 builtin_function ("__builtin_cosf", float_ftype_float,
4276 BUILT_IN_COS, BUILT_IN_NORMAL, "cosf");
4277 builtin_function ("__builtin_cos", double_ftype_double,
4278 BUILT_IN_COS, BUILT_IN_NORMAL, "cos");
4279 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
4280 BUILT_IN_COS, BUILT_IN_NORMAL, "cosl");
4281 /* We declare these without argument so that the initial declaration
4282 for these identifiers is a builtin. That allows us to redeclare
4283 them later with argument without worrying about the explicit
4284 declarations in stdio.h being taken as the initial declaration.
4285 Also, save the _DECL for these so we can use them later. */
4286 built_in_decls[BUILT_IN_FPUTC] =
4287 builtin_function ("__builtin_fputc", int_ftype_any,
4288 BUILT_IN_FPUTC, BUILT_IN_NORMAL, "fputc");
4289 built_in_decls[BUILT_IN_FPUTS] =
4290 builtin_function ("__builtin_fputs", int_ftype_any,
4291 BUILT_IN_FPUTS, BUILT_IN_NORMAL, "fputs");
4295 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS,
4296 BUILT_IN_NORMAL, NULL_PTR);
4297 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS,
4298 BUILT_IN_NORMAL, NULL_PTR);
4299 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS,
4300 BUILT_IN_NORMAL, NULL_PTR);
4301 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4302 BUILT_IN_NORMAL, NULL_PTR);
4303 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS,
4304 BUILT_IN_NORMAL, NULL_PTR);
4305 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4306 BUILT_IN_NORMAL, NULL_PTR);
4307 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
4308 BUILT_IN_NORMAL, NULL_PTR);
4309 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET,
4310 BUILT_IN_NORMAL, NULL_PTR);
4311 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
4312 BUILT_IN_NORMAL, NULL_PTR);
4313 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
4314 BUILT_IN_NORMAL, NULL_PTR);
4315 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN,
4316 BUILT_IN_NORMAL, NULL_PTR);
4317 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT,
4318 BUILT_IN_NORMAL, NULL_PTR);
4319 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT,
4320 BUILT_IN_NORMAL, NULL_PTR);
4321 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
4322 BUILT_IN_NORMAL, NULL_PTR);
4323 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN,
4324 BUILT_IN_NORMAL, NULL_PTR);
4325 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN,
4326 BUILT_IN_NORMAL, NULL_PTR);
4327 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN,
4328 BUILT_IN_NORMAL, NULL_PTR);
4329 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS,
4330 BUILT_IN_NORMAL, NULL_PTR);
4331 builtin_function ("cos", double_ftype_double, BUILT_IN_COS,
4332 BUILT_IN_NORMAL, NULL_PTR);
4333 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS,
4334 BUILT_IN_NORMAL, NULL_PTR);
4335 /* We declare these without argument so that the initial
4336 declaration for these identifiers is a builtin. That allows
4337 us to redeclare them later with argument without worrying
4338 about the explicit declarations in stdio.h being taken as the
4339 initial declaration. */
4340 builtin_function ("fputc", int_ftype_any, BUILT_IN_FPUTC,
4341 BUILT_IN_NORMAL, NULL_PTR);
4342 builtin_function ("fputs", int_ftype_any, BUILT_IN_FPUTS,
4343 BUILT_IN_NORMAL, NULL_PTR);
4345 /* Declare these functions volatile
4346 to avoid spurious "control drops through" warnings. */
4347 temp = builtin_function ("abort", cplus_mode ? void_ftype : void_ftype_any,
4348 0, NOT_BUILT_IN, NULL_PTR);
4349 TREE_THIS_VOLATILE (temp) = 1;
4350 TREE_SIDE_EFFECTS (temp) = 1;
4352 #if 0 /* ??? The C++ frontend used to do this. */
4353 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4355 DECL_BUILT_IN_NONANSI (temp) = 1;
4357 temp = builtin_function ("exit",
4358 cplus_mode ? void_ftype_int : void_ftype_any,
4359 0, NOT_BUILT_IN, NULL_PTR);
4360 TREE_THIS_VOLATILE (temp) = 1;
4361 TREE_SIDE_EFFECTS (temp) = 1;
4363 #if 0 /* ??? The C++ frontend used to do this. */
4364 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4366 DECL_BUILT_IN_NONANSI (temp) = 1;
4371 /* Support for these has not been written in either expand_builtin
4372 or build_function_call. */
4373 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV,
4374 BUILT_IN_NORMAL, NULL_PTR);
4375 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV,
4376 BUILT_IN_NORMAL, NULL_PTR);
4377 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
4378 BUILT_IN_NORMAL, NULL_PTR);
4379 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
4380 BUILT_IN_NORMAL, NULL_PTR);
4381 builtin_function ("__builtin_fmod", double_ftype_double_double,
4382 BUILT_IN_FMOD, BUILT_IN_NORMAL, NULL_PTR);
4383 builtin_function ("__builtin_frem", double_ftype_double_double,
4384 BUILT_IN_FREM, BUILT_IN_NORMAL, NULL_PTR);
4385 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
4386 BUILT_IN_NORMAL, NULL_PTR);
4387 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
4388 BUILT_IN_NORMAL, NULL_PTR);
4391 main_identifier_node = get_identifier ("main");
4393 /* ??? Perhaps there's a better place to do this. But it is related
4394 to __builtin_va_arg, so it isn't that off-the-wall. */
4395 lang_type_promotes_to = simple_type_promotes_to;
4399 build_va_arg (expr, type)
4402 return build1 (VA_ARG_EXPR, type, expr);
4405 /* Given a type, apply default promotions wrt unnamed function arguments
4406 and return the new type. Return NULL_TREE if no change. */
4407 /* ??? There is a function of the same name in the C++ front end that
4408 does something similar, but is more thorough and does not return NULL
4409 if no change. We could perhaps share code, but it would make the
4410 self_promoting_type property harder to identify. */
4413 simple_type_promotes_to (type)
4416 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4417 return double_type_node;
4419 if (C_PROMOTING_INTEGER_TYPE_P (type))
4421 /* Traditionally, unsignedness is preserved in default promotions.
4422 Also preserve unsignedness if not really getting any wider. */
4423 if (TREE_UNSIGNED (type)
4424 && (flag_traditional
4425 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
4426 return unsigned_type_node;
4427 return integer_type_node;
4433 /* Return 1 if PARMS specifies a fixed number of parameters
4434 and none of their types is affected by default promotions. */
4437 self_promoting_args_p (parms)
4441 for (t = parms; t; t = TREE_CHAIN (t))
4443 register tree type = TREE_VALUE (t);
4445 if (TREE_CHAIN (t) == 0 && type != void_type_node)
4451 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4454 if (C_PROMOTING_INTEGER_TYPE_P (type))
4460 /* Recognize certain built-in functions so we can make tree-codes
4461 other than CALL_EXPR. We do this when it enables fold-const.c
4462 to do something useful. */
4463 /* ??? By rights this should go in builtins.c, but only C and C++
4464 implement build_{binary,unary}_op. Not exactly sure what bits
4465 of functionality are actually needed from those functions, or
4466 where the similar functionality exists in the other front ends. */
4469 expand_tree_builtin (function, params, coerced_params)
4470 tree function, params, coerced_params;
4472 enum tree_code code;
4474 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
4477 switch (DECL_FUNCTION_CODE (function))
4482 if (coerced_params == 0)
4483 return integer_zero_node;
4484 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
4486 case BUILT_IN_ISGREATER:
4487 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4493 case BUILT_IN_ISGREATEREQUAL:
4494 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4500 case BUILT_IN_ISLESS:
4501 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4507 case BUILT_IN_ISLESSEQUAL:
4508 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4514 case BUILT_IN_ISLESSGREATER:
4515 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4521 case BUILT_IN_ISUNORDERED:
4522 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
4523 return integer_zero_node;
4524 code = UNORDERED_EXPR;
4532 || TREE_CHAIN (params) == 0)
4534 error ("too few arguments to function `%s'",
4535 IDENTIFIER_POINTER (DECL_NAME (function)));
4536 return error_mark_node;
4538 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
4540 error ("too many arguments to function `%s'",
4541 IDENTIFIER_POINTER (DECL_NAME (function)));
4542 return error_mark_node;
4545 arg0 = TREE_VALUE (params);
4546 arg1 = TREE_VALUE (TREE_CHAIN (params));
4547 arg0 = build_binary_op (code, arg0, arg1, 0);
4548 if (code != UNORDERED_EXPR)
4549 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
4561 /* Returns non-zero if CODE is the code for a statement. */
4564 statement_code_p (code)
4565 enum tree_code code;
4588 if (lang_statement_code_p)
4589 return (*lang_statement_code_p) (code);
4594 /* Walk the statemen tree, rooted at *tp. Apply FUNC to all the
4595 sub-trees of *TP in a pre-order traversal. FUNC is called with the
4596 DATA and the address of each sub-tree. If FUNC returns a non-NULL
4597 value, the traversal is aborted, and the value returned by FUNC is
4598 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
4599 the node being visited are not walked.
4601 We don't need a without_duplicates variant of this one because the
4602 statement tree is a tree, not a graph. */
4605 walk_stmt_tree (tp, func, data)
4610 enum tree_code code;
4615 #define WALK_SUBTREE(NODE) \
4618 result = walk_stmt_tree (&(NODE), func, data); \
4624 /* Skip empty subtrees. */
4628 /* Skip subtrees below non-statement nodes. */
4629 if (!statement_code_p (TREE_CODE (*tp)))
4632 /* Call the function. */
4634 result = (*func) (tp, &walk_subtrees, data);
4636 /* If we found something, return it. */
4640 /* Even if we didn't, FUNC may have decided that there was nothing
4641 interesting below this point in the tree. */
4645 /* FUNC may have modified the tree, recheck that we're looking at a
4647 code = TREE_CODE (*tp);
4648 if (!statement_code_p (code))
4651 /* Walk over all the sub-trees of this operand. Statement nodes never
4652 contain RTL, and we needn't worry about TARGET_EXPRs. */
4653 len = TREE_CODE_LENGTH (code);
4655 /* Go through the subtrees. We need to do this in forward order so
4656 that the scope of a FOR_EXPR is handled properly. */
4657 for (i = 0; i < len; ++i)
4658 WALK_SUBTREE (TREE_OPERAND (*tp, i));
4660 /* Finally visit the chain. This can be tail-recursion optimized if
4661 we write it this way. */
4662 return walk_stmt_tree (&TREE_CHAIN (*tp), func, data);
4667 /* Used to compare case labels. K1 and K2 are actually tree nodes
4668 representing case labels, or NULL_TREE for a `default' label.
4669 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
4670 K2, and 0 if K1 and K2 are equal. */
4673 case_compare (k1, k2)
4677 /* Consider a NULL key (such as arises with a `default' label) to be
4678 smaller than anything else. */
4684 return tree_int_cst_compare ((tree) k1, (tree) k2);
4687 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
4688 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
4689 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
4690 case label was declared using the usual C/C++ syntax, rather than
4691 the GNU case range extension. CASES is a tree containing all the
4692 case ranges processed so far; COND is the condition for the
4693 switch-statement itself. Returns the CASE_LABEL created, or
4694 ERROR_MARK_NODE if no CASE_LABEL is created. */
4697 c_add_case_label (cases, cond, low_value, high_value)
4706 splay_tree_node node;
4708 /* Create the LABEL_DECL itself. */
4709 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
4710 DECL_CONTEXT (label) = current_function_decl;
4712 /* If there was an error processing the switch condition, bail now
4713 before we get more confused. */
4714 if (!cond || cond == error_mark_node)
4716 /* Add a label anyhow so that the back-end doesn't think that
4717 the beginning of the switch is unreachable. */
4719 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4720 return error_mark_node;
4723 if ((low_value && TREE_TYPE (low_value)
4724 && POINTER_TYPE_P (TREE_TYPE (low_value)))
4725 || (high_value && TREE_TYPE (high_value)
4726 && POINTER_TYPE_P (TREE_TYPE (high_value))))
4727 error ("pointers are not permitted as case values");
4729 /* Case ranges are a GNU extension. */
4730 if (high_value && pedantic)
4732 if (c_language == clk_cplusplus)
4733 pedwarn ("ISO C++ forbids range expressions in switch statements");
4735 pedwarn ("ISO C forbids range expressions in switch statements");
4738 type = TREE_TYPE (cond);
4741 low_value = check_case_value (low_value);
4742 low_value = convert_and_check (type, low_value);
4746 high_value = check_case_value (high_value);
4747 high_value = convert_and_check (type, high_value);
4750 /* If an error has occurred, bail out now. */
4751 if (low_value == error_mark_node || high_value == error_mark_node)
4754 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4755 return error_mark_node;
4758 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
4759 really a case range, even though it was written that way. Remove
4760 the HIGH_VALUE to simplify later processing. */
4761 if (tree_int_cst_equal (low_value, high_value))
4762 high_value = NULL_TREE;
4763 if (low_value && high_value
4764 && !tree_int_cst_lt (low_value, high_value))
4765 warning ("empty range specified");
4767 /* Look up the LOW_VALUE in the table of case labels we already
4769 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
4770 /* If there was not an exact match, check for overlapping ranges.
4771 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
4772 that's a `default' label and the only overlap is an exact match. */
4773 if (!node && (low_value || high_value))
4775 splay_tree_node low_bound;
4776 splay_tree_node high_bound;
4778 /* Even though there wasn't an exact match, there might be an
4779 overlap between this case range and another case range.
4780 Since we've (inductively) not allowed any overlapping case
4781 ranges, we simply need to find the greatest low case label
4782 that is smaller that LOW_VALUE, and the smallest low case
4783 label that is greater than LOW_VALUE. If there is an overlap
4784 it will occur in one of these two ranges. */
4785 low_bound = splay_tree_predecessor (cases,
4786 (splay_tree_key) low_value);
4787 high_bound = splay_tree_successor (cases,
4788 (splay_tree_key) low_value);
4790 /* Check to see if the LOW_BOUND overlaps. It is smaller than
4791 the LOW_VALUE, so there is no need to check unless the
4792 LOW_BOUND is in fact itself a case range. */
4794 && CASE_HIGH ((tree) low_bound->value)
4795 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
4798 /* Check to see if the HIGH_BOUND overlaps. The low end of that
4799 range is bigger than the low end of the current range, so we
4800 are only interested if the current range is a real range, and
4801 not an ordinary case label. */
4804 && (tree_int_cst_compare ((tree) high_bound->key,
4809 /* If there was an overlap, issue an error. */
4812 tree duplicate = CASE_LABEL_DECL ((tree) node->value);
4816 error ("duplicate (or overlapping) case value");
4817 error_with_decl (duplicate,
4818 "this is the first entry overlapping that value");
4822 error ("duplicate case value") ;
4823 error_with_decl (duplicate, "previously used here");
4827 error ("multiple default labels in one switch");
4828 error_with_decl (duplicate, "this is the first default label");
4831 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4834 /* Add a CASE_LABEL to the statement-tree. */
4835 case_label = add_stmt (build_case_label (low_value, high_value, label));
4836 /* Register this case label in the splay tree. */
4837 splay_tree_insert (cases,
4838 (splay_tree_key) low_value,
4839 (splay_tree_value) case_label);
4844 /* Mark P (a stmt_tree) for GC. The use of a `void *' for the
4845 parameter allows this function to be used as a GC-marking
4852 stmt_tree st = (stmt_tree) p;
4854 ggc_mark_tree (st->x_last_stmt);
4855 ggc_mark_tree (st->x_last_expr_type);
4858 /* Mark LD for GC. */
4861 c_mark_lang_decl (c)
4862 struct c_lang_decl *c;
4864 ggc_mark_tree (c->saved_tree);
4867 /* Mark F for GC. */
4870 mark_c_language_function (f)
4871 struct language_function *f;
4876 mark_stmt_tree (&f->x_stmt_tree);
4877 ggc_mark_tree (f->x_scope_stmt_stack);
4880 /* Hook used by expand_expr to expand language-specific tree codes. */
4883 c_expand_expr (exp, target, tmode, modifier)
4886 enum machine_mode tmode;
4887 enum expand_modifier modifier;
4889 switch (TREE_CODE (exp))
4896 /* Since expand_expr_stmt calls free_temp_slots after every
4897 expression statement, we must call push_temp_slots here.
4898 Otherwise, any temporaries in use now would be considered
4899 out-of-scope after the first EXPR_STMT from within the
4902 rtl_expr = expand_start_stmt_expr ();
4903 expand_stmt (STMT_EXPR_STMT (exp));
4904 expand_end_stmt_expr (rtl_expr);
4905 result = expand_expr (rtl_expr, target, tmode, modifier);
4919 /* Hook used by safe_from_p to handle language-specific tree codes. */
4922 c_safe_from_p (target, exp)
4926 /* We can see statements here when processing the body of a
4927 statement-expression. For a declaration statement declaring a
4928 variable, look at the variable's initializer. */
4929 if (TREE_CODE (exp) == DECL_STMT)
4931 tree decl = DECL_STMT_DECL (exp);
4933 if (TREE_CODE (decl) == VAR_DECL
4934 && DECL_INITIAL (decl)
4935 && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0))
4939 /* For any statement, we must follow the statement-chain. */
4940 if (statement_code_p (TREE_CODE (exp)) && TREE_CHAIN (exp))
4941 return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0);
4943 /* Assume everything else is safe. */
4947 /* Tree code classes. */
4949 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
4951 static char c_tree_code_type[] = {
4953 #include "c-common.def"
4957 /* Table indexed by tree code giving number of expression
4958 operands beyond the fixed part of the node structure.
4959 Not used for types or decls. */
4961 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
4963 static int c_tree_code_length[] = {
4965 #include "c-common.def"
4969 /* Names of tree components.
4970 Used for printing out the tree and error messages. */
4971 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
4973 static const char *c_tree_code_name[] = {
4975 #include "c-common.def"
4979 /* Adds the tree codes specific to the C front end to the list of all
4985 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
4987 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
4988 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
4990 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
4991 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
4993 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));