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. */
35 #include "diagnostic.h"
42 #undef WCHAR_TYPE_SIZE
43 #define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
45 /* The following symbols are subsumed in the c_global_trees array, and
46 listed here individually for documentation purposes.
48 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
50 tree short_integer_type_node;
51 tree long_integer_type_node;
52 tree long_long_integer_type_node;
54 tree short_unsigned_type_node;
55 tree long_unsigned_type_node;
56 tree long_long_unsigned_type_node;
58 tree boolean_type_node;
59 tree boolean_false_node;
60 tree boolean_true_node;
62 tree ptrdiff_type_node;
64 tree unsigned_char_type_node;
65 tree signed_char_type_node;
67 tree signed_wchar_type_node;
68 tree unsigned_wchar_type_node;
71 tree double_type_node;
72 tree long_double_type_node;
74 tree complex_integer_type_node;
75 tree complex_float_type_node;
76 tree complex_double_type_node;
77 tree complex_long_double_type_node;
85 tree unsigned_intQI_type_node;
86 tree unsigned_intHI_type_node;
87 tree unsigned_intSI_type_node;
88 tree unsigned_intDI_type_node;
89 tree unsigned_intTI_type_node;
91 tree widest_integer_literal_type_node;
92 tree widest_unsigned_literal_type_node;
94 Nodes for types `void *' and `const void *'.
96 tree ptr_type_node, const_ptr_type_node;
98 Nodes for types `char *' and `const char *'.
100 tree string_type_node, const_string_type_node;
102 Type `char[SOMENUMBER]'.
103 Used when an array of char is needed and the size is irrelevant.
105 tree char_array_type_node;
107 Type `int[SOMENUMBER]' or something like it.
108 Used when an array of int needed and the size is irrelevant.
110 tree int_array_type_node;
112 Type `wchar_t[SOMENUMBER]' or something like it.
113 Used when a wide string literal is created.
115 tree wchar_array_type_node;
117 Type `int ()' -- used for implicit declaration of functions.
119 tree default_function_type;
121 Function types `int (int)', etc.
127 tree ptr_ftype_sizetype;
129 A VOID_TYPE node, packaged in a TREE_LIST.
133 The identifiers __FUNCTION__, __PRETTY_FUNCTION__, and __func__.
135 tree function_id_node;
136 tree pretty_function_id_node;
141 tree c_global_trees[CTI_MAX];
143 /* The elements of `ridpointers' are identifier nodes for the reserved
144 type names and storage classes. It is indexed by a RID_... value. */
147 tree (*make_fname_decl) PARAMS ((tree, const char *, int));
149 /* If non-NULL, the address of a language-specific function that
150 returns 1 for language-specific statement codes. */
151 int (*lang_statement_code_p) PARAMS ((enum tree_code));
153 /* If non-NULL, the address of a language-specific function that takes
154 any action required right before expand_function_end is called. */
155 void (*lang_expand_function_end) PARAMS ((void));
157 /* Nonzero means the expression being parsed will never be evaluated.
158 This is a count, since unevaluated expressions can nest. */
161 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
162 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
163 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
164 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
165 A_NO_LIMIT_STACK, A_PURE};
167 enum format_type { printf_format_type, scanf_format_type,
168 strftime_format_type };
170 static void add_attribute PARAMS ((enum attrs, const char *,
172 static void init_attributes PARAMS ((void));
173 static void record_function_format PARAMS ((tree, tree, enum format_type,
175 static void record_international_format PARAMS ((tree, tree, int));
176 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
178 /* Keep a stack of if statements. We record the number of compound
179 statements seen up to the if keyword, as well as the line number
180 and file of the if. If a potentially ambiguous else is seen, that
181 fact is recorded; the warning is issued when we can be sure that
182 the enclosing if statement does not have an else branch. */
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 if (TYPE_PRECISION (typefm) > (TREE_UNSIGNED (type)
765 ? TYPE_PRECISION(uintmax_type_node)
766 : TYPE_PRECISION(intmax_type_node))
768 pedwarn ("type with more precision than %s",
769 TREE_UNSIGNED (type) ? "uintmax_t" : "intmax_t");
770 TREE_TYPE (decl) = type = typefm;
771 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
772 layout_decl (decl, 0);
778 #ifdef ASM_OUTPUT_SECTION_NAME
779 if ((TREE_CODE (decl) == FUNCTION_DECL
780 || TREE_CODE (decl) == VAR_DECL)
781 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
783 if (TREE_CODE (decl) == VAR_DECL
784 && current_function_decl != NULL_TREE
785 && ! TREE_STATIC (decl))
786 error_with_decl (decl,
787 "section attribute cannot be specified for local variables");
788 /* The decl may have already been given a section attribute from
789 a previous declaration. Ensure they match. */
790 else if (DECL_SECTION_NAME (decl) != NULL_TREE
791 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
792 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
793 error_with_decl (node,
794 "section of `%s' conflicts with previous declaration");
796 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
799 error_with_decl (node,
800 "section attribute not allowed for `%s'");
802 error_with_decl (node,
803 "section attributes are not supported for this target");
810 = (args ? TREE_VALUE (args)
811 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
814 /* Strip any NOPs of any kind. */
815 while (TREE_CODE (align_expr) == NOP_EXPR
816 || TREE_CODE (align_expr) == CONVERT_EXPR
817 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
818 align_expr = TREE_OPERAND (align_expr, 0);
820 if (TREE_CODE (align_expr) != INTEGER_CST)
822 error ("requested alignment is not a constant");
826 if ((i = tree_log2 (align_expr)) == -1)
827 error ("requested alignment is not a power of 2");
828 else if (i > HOST_BITS_PER_INT - 2)
829 error ("requested alignment is too large");
832 /* If we have a TYPE_DECL, then copy the type, so that we
833 don't accidentally modify a builtin type. See pushdecl. */
834 if (decl && TREE_TYPE (decl) != error_mark_node
835 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
837 tree tt = TREE_TYPE (decl);
838 DECL_ORIGINAL_TYPE (decl) = tt;
839 tt = build_type_copy (tt);
840 TYPE_NAME (tt) = decl;
841 TREE_USED (tt) = TREE_USED (decl);
842 TREE_TYPE (decl) = tt;
846 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
847 TYPE_USER_ALIGN (type) = 1;
849 else if (TREE_CODE (decl) != VAR_DECL
850 && TREE_CODE (decl) != FIELD_DECL)
851 error_with_decl (decl,
852 "alignment may not be specified for `%s'");
855 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
856 DECL_USER_ALIGN (decl) = 1;
863 tree format_type_id = TREE_VALUE (args);
864 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
865 tree first_arg_num_expr
866 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
867 unsigned HOST_WIDE_INT format_num, first_arg_num;
868 enum format_type format_type;
870 unsigned int arg_num;
872 if (TREE_CODE (decl) != FUNCTION_DECL)
874 error_with_decl (decl,
875 "argument format specified for non-function `%s'");
879 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
881 error ("unrecognized format specifier");
886 const char *p = IDENTIFIER_POINTER (format_type_id);
888 if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
889 format_type = printf_format_type;
890 else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
891 format_type = scanf_format_type;
892 else if (!strcmp (p, "strftime")
893 || !strcmp (p, "__strftime__"))
894 format_type = strftime_format_type;
897 warning ("`%s' is an unrecognized format function type", p);
902 /* Strip any conversions from the string index and first arg number
903 and verify they are constants. */
904 while (TREE_CODE (format_num_expr) == NOP_EXPR
905 || TREE_CODE (format_num_expr) == CONVERT_EXPR
906 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
907 format_num_expr = TREE_OPERAND (format_num_expr, 0);
909 while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
910 || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
911 || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
912 first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
914 if (TREE_CODE (format_num_expr) != INTEGER_CST
915 || TREE_INT_CST_HIGH (format_num_expr) != 0
916 || TREE_CODE (first_arg_num_expr) != INTEGER_CST
917 || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
919 error ("format string has invalid operand number");
923 format_num = TREE_INT_CST_LOW (format_num_expr);
924 first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
925 if (first_arg_num != 0 && first_arg_num <= format_num)
927 error ("format string arg follows the args to be formatted");
931 /* If a parameter list is specified, verify that the format_num
932 argument is actually a string, in case the format attribute
934 argument = TYPE_ARG_TYPES (type);
937 for (arg_num = 1; argument != 0 && arg_num != format_num;
938 ++arg_num, argument = TREE_CHAIN (argument))
942 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
943 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
946 error ("format string arg not a string type");
950 else if (first_arg_num != 0)
952 /* Verify that first_arg_num points to the last arg,
955 arg_num++, argument = TREE_CHAIN (argument);
957 if (arg_num != first_arg_num)
959 error ("args to be formatted is not '...'");
965 record_function_format (DECL_NAME (decl),
966 DECL_ASSEMBLER_NAME (decl),
967 format_type, format_num, first_arg_num);
973 tree format_num_expr = TREE_VALUE (args);
974 unsigned HOST_WIDE_INT format_num;
975 unsigned int arg_num;
978 if (TREE_CODE (decl) != FUNCTION_DECL)
980 error_with_decl (decl,
981 "argument format specified for non-function `%s'");
985 /* Strip any conversions from the first arg number and verify it
987 while (TREE_CODE (format_num_expr) == NOP_EXPR
988 || TREE_CODE (format_num_expr) == CONVERT_EXPR
989 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
990 format_num_expr = TREE_OPERAND (format_num_expr, 0);
992 if (TREE_CODE (format_num_expr) != INTEGER_CST
993 || TREE_INT_CST_HIGH (format_num_expr) != 0)
995 error ("format string has invalid operand number");
999 format_num = TREE_INT_CST_LOW (format_num_expr);
1001 /* If a parameter list is specified, verify that the format_num
1002 argument is actually a string, in case the format attribute
1004 argument = TYPE_ARG_TYPES (type);
1007 for (arg_num = 1; argument != 0 && arg_num != format_num;
1008 ++arg_num, argument = TREE_CHAIN (argument))
1012 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
1013 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
1016 error ("format string arg not a string type");
1021 if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
1022 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
1025 error ("function does not return string type");
1029 record_international_format (DECL_NAME (decl),
1030 DECL_ASSEMBLER_NAME (decl),
1036 declare_weak (decl);
1040 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
1041 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
1042 error_with_decl (decl,
1043 "`%s' defined both normally and as an alias");
1044 else if (decl_function_context (decl) == 0)
1048 id = TREE_VALUE (args);
1049 if (TREE_CODE (id) != STRING_CST)
1051 error ("alias arg not a string");
1054 id = get_identifier (TREE_STRING_POINTER (id));
1055 /* This counts as a use of the object pointed to. */
1058 if (TREE_CODE (decl) == FUNCTION_DECL)
1059 DECL_INITIAL (decl) = error_mark_node;
1061 DECL_EXTERNAL (decl) = 0;
1062 assemble_alias (decl, id);
1065 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1068 case A_NO_CHECK_MEMORY_USAGE:
1069 if (TREE_CODE (decl) != FUNCTION_DECL)
1071 error_with_decl (decl,
1072 "`%s' attribute applies only to functions",
1073 IDENTIFIER_POINTER (name));
1075 else if (DECL_INITIAL (decl))
1077 error_with_decl (decl,
1078 "can't set `%s' attribute after definition",
1079 IDENTIFIER_POINTER (name));
1082 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1085 case A_NO_INSTRUMENT_FUNCTION:
1086 if (TREE_CODE (decl) != FUNCTION_DECL)
1088 error_with_decl (decl,
1089 "`%s' attribute applies only to functions",
1090 IDENTIFIER_POINTER (name));
1092 else if (DECL_INITIAL (decl))
1094 error_with_decl (decl,
1095 "can't set `%s' attribute after definition",
1096 IDENTIFIER_POINTER (name));
1099 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1102 case A_NO_LIMIT_STACK:
1103 if (TREE_CODE (decl) != FUNCTION_DECL)
1105 error_with_decl (decl,
1106 "`%s' attribute applies only to functions",
1107 IDENTIFIER_POINTER (name));
1109 else if (DECL_INITIAL (decl))
1111 error_with_decl (decl,
1112 "can't set `%s' attribute after definition",
1113 IDENTIFIER_POINTER (name));
1116 DECL_NO_LIMIT_STACK (decl) = 1;
1122 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1123 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1125 The head of the declspec list is stored in DECLSPECS.
1126 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1128 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1129 the list elements. We drop the containing TREE_LIST nodes and link the
1130 resulting attributes together the way decl_attributes expects them. */
1133 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1135 tree *declspecs, *prefix_attributes;
1137 tree t, s, a, next, specs, attrs;
1139 /* This can happen after an __extension__ in pedantic mode. */
1140 if (specs_attrs != NULL_TREE
1141 && TREE_CODE (specs_attrs) == INTEGER_CST)
1143 *declspecs = NULL_TREE;
1144 *prefix_attributes = NULL_TREE;
1148 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1149 if (specs_attrs != NULL_TREE
1150 && TREE_CODE (specs_attrs) != TREE_LIST)
1152 *declspecs = specs_attrs;
1153 *prefix_attributes = NULL_TREE;
1157 /* Remember to keep the lists in the same order, element-wise. */
1159 specs = s = NULL_TREE;
1160 attrs = a = NULL_TREE;
1161 for (t = specs_attrs; t; t = next)
1163 next = TREE_CHAIN (t);
1164 /* Declspecs have a non-NULL TREE_VALUE. */
1165 if (TREE_VALUE (t) != NULL_TREE)
1167 if (specs == NULL_TREE)
1177 if (attrs == NULL_TREE)
1178 attrs = a = TREE_PURPOSE (t);
1181 TREE_CHAIN (a) = TREE_PURPOSE (t);
1182 a = TREE_PURPOSE (t);
1184 /* More attrs can be linked here, move A to the end. */
1185 while (TREE_CHAIN (a) != NULL_TREE)
1190 /* Terminate the lists. */
1192 TREE_CHAIN (s) = NULL_TREE;
1194 TREE_CHAIN (a) = NULL_TREE;
1198 *prefix_attributes = attrs;
1201 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1202 This function is used by the parser when a rule will accept attributes
1203 in a particular position, but we don't want to support that just yet.
1205 A warning is issued for every ignored attribute. */
1208 strip_attrs (specs_attrs)
1213 split_specs_attrs (specs_attrs, &specs, &attrs);
1217 warning ("`%s' attribute ignored",
1218 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1219 attrs = TREE_CHAIN (attrs);
1225 /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
1226 a parameter list. */
1228 /* The meaningfully distinct length modifiers for format checking recognised
1245 /* The standard versions in which various format features appeared. */
1246 enum format_std_version
1255 /* Flags that may apply to a particular kind of format checked by GCC. */
1258 /* This format converts arguments of types determined by the
1260 FMT_FLAG_ARG_CONVERT = 1,
1261 /* The scanf allocation 'a' kludge applies to this format kind. */
1262 FMT_FLAG_SCANF_A_KLUDGE = 2,
1263 /* A % during parsing a specifier is allowed to be a modified % rather
1264 that indicating the format is broken and we are out-of-sync. */
1265 FMT_FLAG_FANCY_PERCENT_OK = 4
1266 /* Not included here: details of whether width or precision may occur
1267 (controlled by width_char and precision_char); details of whether
1268 '*' can be used for these (width_type and precision_type); details
1269 of whether length modifiers can occur (length_char_specs); details
1270 of when $ operand numbers are allowed (always, for the formats
1271 supported, if arguments are converted). */
1275 /* Structure describing a length modifier supported in format checking, and
1276 possibly a doubled version such as "hh". */
1279 /* Name of the single-character length modifier. */
1281 /* Index into a format_char_info.types array. */
1282 enum format_lengths index;
1283 /* Standard version this length appears in. */
1284 enum format_std_version std;
1285 /* Same, if the modifier can be repeated, or NULL if it can't. */
1286 const char *double_name;
1287 enum format_lengths double_index;
1288 enum format_std_version double_std;
1289 } format_length_info;
1292 /* Structure desribing the combination of a conversion specifier
1293 (or a set of specifiers which act identically) and a length modifier. */
1296 /* The standard version this combination of length and type appeared in.
1297 This is only relevant if greater than those for length and type
1298 individually; otherwise it is ignored. */
1299 enum format_std_version std;
1300 /* The name to use for the type, if different from that generated internally
1301 (e.g., "signed size_t"). */
1303 /* The type itself. */
1305 } format_type_detail;
1308 /* Macros to fill out tables of these. */
1309 #define BADLEN { 0, NULL, NULL }
1310 #define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
1313 /* Structure desribing a format conversion specifier (or a set of specifiers
1314 which act identically), and the length modifiers used with it. */
1317 const char *format_chars;
1319 enum format_std_version std;
1320 /* Types accepted for each length modifier. */
1321 format_type_detail types[FMT_LEN_MAX];
1322 /* List of other modifier characters allowed with these specifiers.
1323 This lists flags, and additionally "w" for width, "p" for precision,
1324 "a" for scanf "a" allocation extension (not applicable in C99 mode),
1325 "*" for scanf suppression, and "E" and "O" for those strftime
1327 const char *flag_chars;
1328 /* List of additional flags describing these conversion specifiers.
1329 "c" for generic character pointers being allowed, "2" for strftime
1330 two digit year formats, "3" for strftime formats giving two digit
1331 years in some locales, "4" for "2" which becomes "3" with an "E" modifier,
1332 "o" if use of strftime "O" is a GNU extension beyond C99,
1333 "W" if the argument is a pointer which is dereferenced and written into,
1334 "i" for printf integer formats where the '0' flag is ignored with
1335 precision, and "[" for the starting character of a scanf scanset. */
1340 /* Structure describing a flag accepted by some kind of format. */
1343 /* The flag character in question (0 for end of array). */
1345 /* Zero if this entry describes the flag character in general, or a
1346 non-zero character that may be found in flags2 if it describes the
1347 flag when used with certain formats only. If the latter, only
1348 the first such entry found that applies to the current conversion
1349 specifier is used; the values of `name' and `long_name' it supplies
1350 will be used, if non-NULL and the standard version is higher than
1351 the unpredicated one, for any pedantic warning. For example, 'o'
1352 for strftime formats (meaning 'O' is an extension over C99). */
1354 /* The name to use for this flag in diagnostic messages. For example,
1355 N_("`0' flag"), N_("field width"). */
1357 /* Long name for this flag in diagnostic messages; currently only used for
1358 "ISO C does not support ...". For example, N_("the `I' printf flag"). */
1359 const char *long_name;
1360 /* The standard version in which it appeared. */
1361 enum format_std_version std;
1365 /* Structure describing a combination of flags that is bad for some kind
1369 /* The first flag character in question (0 for end of array). */
1371 /* The second flag character. */
1373 /* Non-zero if the message should say that the first flag is ignored with
1374 the second, zero if the combination should simply be objected to. */
1376 /* Zero if this entry applies whenever this flag combination occurs,
1377 a non-zero character from flags2 if it only applies in some
1378 circumstances (e.g. 'i' for printf formats ignoring 0 with precision). */
1383 /* Structure describing a particular kind of format processed by GCC. */
1386 /* The name of this kind of format, for use in diagnostics. */
1388 /* Specifications of the length modifiers accepted; possibly NULL. */
1389 const format_length_info *length_char_specs;
1390 /* Details of the conversion specification characters accepted. */
1391 const format_char_info *conversion_specs;
1392 /* String listing the flag characters that are accepted. */
1393 const char *flag_chars;
1394 /* String listing modifier characters (strftime) accepted. May be NULL. */
1395 const char *modifier_chars;
1396 /* Details of the flag characters, including pseudo-flags. */
1397 const format_flag_spec *flag_specs;
1398 /* Details of bad combinations of flags. */
1399 const format_flag_pair *bad_flag_pairs;
1400 /* Flags applicable to this kind of format. */
1402 /* Flag character to treat a width as, or 0 if width not used. */
1404 /* Flag character to treat a precision as, or 0 if precision not used. */
1406 /* If a flag character has the effect of suppressing the conversion of
1407 an argument ('*' in scanf), that flag character, otherwise 0. */
1408 int suppression_char;
1409 /* Flag character to treat a length modifier as (ignored if length
1410 modifiers not used). Need not be placed in flag_chars for conversion
1411 specifiers, but is used to check for bad combinations such as length
1412 modifier with assignment suppression in scanf. */
1413 int length_code_char;
1414 /* Pointer to type of argument expected if '*' is used for a width,
1415 or NULL if '*' not used for widths. */
1417 /* Pointer to type of argument expected if '*' is used for a precision,
1418 or NULL if '*' not used for precisions. */
1419 tree *precision_type;
1423 /* Structure describing details of a type expected in format checking,
1424 and the type to check against it. */
1425 typedef struct format_wanted_type
1427 /* The type wanted. */
1429 /* The name of this type to use in diagnostics. */
1430 const char *wanted_type_name;
1431 /* The level of indirection through pointers at which this type occurs. */
1433 /* Whether, when pointer_count is 1, to allow any character type when
1434 pedantic, rather than just the character or void type specified. */
1435 int char_lenient_flag;
1436 /* Whether the argument, dereferenced once, is written into and so the
1437 argument must not be a pointer to a const-qualified type. */
1438 int writing_in_flag;
1439 /* If warnings should be of the form "field precision is not type int",
1440 the name to use (in this case "field precision"), otherwise NULL,
1441 for "%s format, %s arg" type messages. If (in an extension), this
1442 is a pointer type, wanted_type_name should be set to include the
1443 terminating '*' characters of the type name to give a correct
1446 /* The actual parameter to check against the wanted type. */
1448 /* The argument number of that parameter. */
1450 /* The next type to check for this format conversion, or NULL if none. */
1451 struct format_wanted_type *next;
1452 } format_wanted_type;
1455 static const format_length_info printf_length_specs[] =
1457 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1458 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1459 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1460 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1461 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1462 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
1463 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1464 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1465 { NULL, 0, 0, NULL, 0, 0 }
1469 /* This differs from printf_length_specs only in that "Z" is not accepted. */
1470 static const format_length_info scanf_length_specs[] =
1472 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1473 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1474 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1475 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1476 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1477 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1478 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1479 { NULL, 0, 0, NULL, 0, 0 }
1483 static const format_flag_spec printf_flag_specs[] =
1485 { ' ', 0, N_("` ' flag"), N_("the ` ' printf flag"), STD_C89 },
1486 { '+', 0, N_("`+' flag"), N_("the `+' printf flag"), STD_C89 },
1487 { '#', 0, N_("`#' flag"), N_("the `#' printf flag"), STD_C89 },
1488 { '0', 0, N_("`0' flag"), N_("the `0' printf flag"), STD_C89 },
1489 { '-', 0, N_("`-' flag"), N_("the `-' printf flag"), STD_C89 },
1490 { '\'', 0, N_("`'' flag"), N_("the `'' printf flag"), STD_EXT },
1491 { 'I', 0, N_("`I' flag"), N_("the `I' printf flag"), STD_EXT },
1492 { 'w', 0, N_("field width"), N_("field width in printf format"), STD_C89 },
1493 { 'p', 0, N_("precision"), N_("precision in printf format"), STD_C89 },
1494 { 'L', 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
1495 { 0, 0, NULL, NULL, 0 }
1499 static const format_flag_pair printf_flag_pairs[] =
1503 { '0', 'p', 1, 'i' },
1508 static const format_flag_spec scanf_flag_specs[] =
1510 { '*', 0, N_("assignment suppression"), N_("assignment suppression"), STD_C89 },
1511 { 'a', 0, N_("`a' flag"), N_("the `a' scanf flag"), STD_EXT },
1512 { 'w', 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
1513 { 'L', 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
1514 { 0, 0, NULL, NULL, 0 }
1518 static const format_flag_pair scanf_flag_pairs[] =
1525 static const format_flag_spec strftime_flag_specs[] =
1527 { '_', 0, N_("`_' flag"), N_("the `_' strftime flag"), STD_EXT },
1528 { '-', 0, N_("`-' flag"), N_("the `-' strftime flag"), STD_EXT },
1529 { '0', 0, N_("`0' flag"), N_("the `0' strftime flag"), STD_EXT },
1530 { '^', 0, N_("`^' flag"), N_("the `^' strftime flag"), STD_EXT },
1531 { '#', 0, N_("`#' flag"), N_("the `#' strftime flag"), STD_EXT },
1532 { 'w', 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
1533 { 'E', 0, N_("`E' modifier"), N_("the `E' strftime modifier"), STD_C99 },
1534 { 'O', 0, N_("`O' modifier"), N_("the `O' strftime modifier"), STD_C99 },
1535 { 'O', 'o', NULL, N_("the `O' modifier"), STD_EXT },
1536 { 0, 0, NULL, NULL, 0 }
1540 static const format_flag_pair strftime_flag_pairs[] =
1547 #define T_I &integer_type_node
1548 #define T89_I { STD_C89, NULL, T_I }
1549 #define T99_I { STD_C99, NULL, T_I }
1550 #define T_L &long_integer_type_node
1551 #define T89_L { STD_C89, NULL, T_L }
1552 #define T_LL &long_long_integer_type_node
1553 #define T99_LL { STD_C99, NULL, T_LL }
1554 #define TEX_LL { STD_EXT, NULL, T_LL }
1555 #define T_S &short_integer_type_node
1556 #define T89_S { STD_C89, NULL, T_S }
1557 #define T_UI &unsigned_type_node
1558 #define T89_UI { STD_C89, NULL, T_UI }
1559 #define T99_UI { STD_C99, NULL, T_UI }
1560 #define T_UL &long_unsigned_type_node
1561 #define T89_UL { STD_C89, NULL, T_UL }
1562 #define T_ULL &long_long_unsigned_type_node
1563 #define T99_ULL { STD_C99, NULL, T_ULL }
1564 #define TEX_ULL { STD_EXT, NULL, T_ULL }
1565 #define T_US &short_unsigned_type_node
1566 #define T89_US { STD_C89, NULL, T_US }
1567 #define T_F &float_type_node
1568 #define T89_F { STD_C89, NULL, T_F }
1569 #define T99_F { STD_C99, NULL, T_F }
1570 #define T_D &double_type_node
1571 #define T89_D { STD_C89, NULL, T_D }
1572 #define T99_D { STD_C99, NULL, T_D }
1573 #define T_LD &long_double_type_node
1574 #define T89_LD { STD_C89, NULL, T_LD }
1575 #define T99_LD { STD_C99, NULL, T_LD }
1576 #define T_C &char_type_node
1577 #define T89_C { STD_C89, NULL, T_C }
1578 #define T_SC &signed_char_type_node
1579 #define T99_SC { STD_C99, NULL, T_SC }
1580 #define T_UC &unsigned_char_type_node
1581 #define T99_UC { STD_C99, NULL, T_UC }
1582 #define T_V &void_type_node
1583 #define T89_V { STD_C89, NULL, T_V }
1584 #define T_W &wchar_type_node
1585 #define T94_W { STD_C94, "wchar_t", T_W }
1586 #define TEX_W { STD_EXT, "wchar_t", T_W }
1587 #define T_WI &wint_type_node
1588 #define T94_WI { STD_C94, "wint_t", T_WI }
1589 #define TEX_WI { STD_EXT, "wint_t", T_WI }
1590 #define T_ST &c_size_type_node
1591 #define T99_ST { STD_C99, "size_t", T_ST }
1592 #define T_SST &signed_size_type_node
1593 #define T99_SST { STD_C99, "signed size_t", T_SST }
1594 #define T_PD &ptrdiff_type_node
1595 #define T99_PD { STD_C99, "ptrdiff_t", T_PD }
1596 #define T_UPD &unsigned_ptrdiff_type_node
1597 #define T99_UPD { STD_C99, "unsigned ptrdiff_t", T_UPD }
1598 #define T_IM &intmax_type_node
1599 #define T99_IM { STD_C99, "intmax_t", T_IM }
1600 #define T_UIM &uintmax_type_node
1601 #define T99_UIM { STD_C99, "uintmax_t", T_UIM }
1603 static const format_char_info print_char_table[] =
1605 /* C89 conversion specifiers. */
1606 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I", "i" },
1607 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#", "i" },
1608 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I", "i" },
1609 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
1610 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
1611 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
1612 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "c" },
1613 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c" },
1614 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
1615 /* C99 conversion specifiers. */
1616 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
1617 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
1618 /* X/Open conversion specifiers. */
1619 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
1620 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
1621 /* GNU conversion specifiers. */
1622 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
1623 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1626 static const format_char_info scan_char_table[] =
1628 /* C89 conversion specifiers. */
1629 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*w", "W" },
1630 { "ouxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w", "W" },
1631 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1632 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW" },
1633 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW" },
1634 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[" },
1635 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1636 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
1637 /* C99 conversion specifiers. */
1638 { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1639 /* X/Open conversion specifiers. */
1640 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1641 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W" },
1642 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1645 static format_char_info time_char_table[] =
1647 /* C89 conversion specifiers. */
1648 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "" },
1649 { "cx", 0, STD_C89, NOLENGTHS, "E", "3" },
1650 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "" },
1651 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o" },
1652 { "p", 0, STD_C89, NOLENGTHS, "#", "" },
1653 { "X", 0, STD_C89, NOLENGTHS, "E", "" },
1654 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4" },
1655 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o" },
1656 { "%", 0, STD_C89, NOLENGTHS, "", "" },
1657 /* C99 conversion specifiers. */
1658 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o" },
1659 { "D", 0, STD_C99, NOLENGTHS, "", "2" },
1660 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "" },
1661 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "" },
1662 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o" },
1663 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o" },
1664 { "h", 0, STD_C99, NOLENGTHS, "^#", "" },
1665 { "z", 0, STD_C99, NOLENGTHS, "O", "o" },
1666 /* GNU conversion specifiers. */
1667 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "" },
1668 { "P", 0, STD_EXT, NOLENGTHS, "", "" },
1669 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1673 /* This must be in the same order as enum format_type. */
1674 static const format_kind_info format_types[] =
1676 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
1677 printf_flag_specs, printf_flag_pairs,
1678 FMT_FLAG_ARG_CONVERT, 'w', 'p', 0, 'L',
1679 &integer_type_node, &integer_type_node
1681 { "scanf", scanf_length_specs, scan_char_table, "*", NULL,
1682 scanf_flag_specs, scanf_flag_pairs,
1683 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE, 'w', 0, '*', 'L',
1686 { "strftime", NULL, time_char_table, "_-0^#", "EO",
1687 strftime_flag_specs, strftime_flag_pairs,
1688 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0,
1694 typedef struct function_format_info
1696 struct function_format_info *next; /* next structure on the list */
1697 tree name; /* identifier such as "printf" */
1698 tree assembler_name; /* optional mangled identifier (for C++) */
1699 enum format_type format_type; /* type of format (printf, scanf, etc.) */
1700 int format_num; /* number of format argument */
1701 int first_arg_num; /* number of first arg (zero for varargs) */
1702 } function_format_info;
1704 static function_format_info *function_format_list = NULL;
1706 typedef struct international_format_info
1708 struct international_format_info *next; /* next structure on the list */
1709 tree name; /* identifier such as "gettext" */
1710 tree assembler_name; /* optional mangled identifier (for C++) */
1711 int format_num; /* number of format argument */
1712 } international_format_info;
1714 static international_format_info *international_format_list = NULL;
1716 static void check_format_info PARAMS ((int *, function_format_info *, tree));
1717 static void status_warning PARAMS ((int *, const char *, ...))
1720 static void init_dollar_format_checking PARAMS ((int, tree));
1721 static int maybe_read_dollar_number PARAMS ((int *, const char **, int,
1723 static void finish_dollar_format_checking PARAMS ((int *));
1725 static const format_flag_spec *get_flag_spec PARAMS ((const format_flag_spec *,
1726 int, const char *));
1728 static void check_format_types PARAMS ((int *, format_wanted_type *));
1729 static int is_valid_printf_arglist PARAMS ((tree));
1730 static rtx c_expand_builtin (tree, rtx, enum machine_mode, enum expand_modifier);
1731 static rtx c_expand_builtin_printf PARAMS ((tree, rtx, enum machine_mode,
1732 enum expand_modifier, int));
1734 /* Initialize the table of functions to perform format checking on.
1735 The ISO C functions are always checked (whether <stdio.h> is
1736 included or not), since it is common to call printf without
1737 including <stdio.h>. There shouldn't be a problem with this,
1738 since ISO C reserves these function names whether you include the
1739 header file or not. In any case, the checking is harmless. With
1740 -ffreestanding, these default attributes are disabled, and must be
1741 specified manually if desired.
1743 Also initialize the name of function that modify the format string for
1744 internationalization purposes. */
1747 init_function_format_info ()
1751 /* Functions from ISO/IEC 9899:1990. */
1752 record_function_format (get_identifier ("printf"), NULL_TREE,
1753 printf_format_type, 1, 2);
1754 record_function_format (get_identifier ("__builtin_printf"), NULL_TREE,
1755 printf_format_type, 1, 2);
1756 record_function_format (get_identifier ("fprintf"), NULL_TREE,
1757 printf_format_type, 2, 3);
1758 record_function_format (get_identifier ("sprintf"), NULL_TREE,
1759 printf_format_type, 2, 3);
1760 record_function_format (get_identifier ("scanf"), NULL_TREE,
1761 scanf_format_type, 1, 2);
1762 record_function_format (get_identifier ("fscanf"), NULL_TREE,
1763 scanf_format_type, 2, 3);
1764 record_function_format (get_identifier ("sscanf"), NULL_TREE,
1765 scanf_format_type, 2, 3);
1766 record_function_format (get_identifier ("vprintf"), NULL_TREE,
1767 printf_format_type, 1, 0);
1768 record_function_format (get_identifier ("vfprintf"), NULL_TREE,
1769 printf_format_type, 2, 0);
1770 record_function_format (get_identifier ("vsprintf"), NULL_TREE,
1771 printf_format_type, 2, 0);
1772 record_function_format (get_identifier ("strftime"), NULL_TREE,
1773 strftime_format_type, 3, 0);
1776 if (flag_hosted && flag_isoc99)
1778 /* ISO C99 adds the snprintf and vscanf family functions. */
1779 record_function_format (get_identifier ("snprintf"), NULL_TREE,
1780 printf_format_type, 3, 4);
1781 record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
1782 printf_format_type, 3, 0);
1783 record_function_format (get_identifier ("vscanf"), NULL_TREE,
1784 scanf_format_type, 1, 0);
1785 record_function_format (get_identifier ("vfscanf"), NULL_TREE,
1786 scanf_format_type, 2, 0);
1787 record_function_format (get_identifier ("vsscanf"), NULL_TREE,
1788 scanf_format_type, 2, 0);
1791 if (flag_hosted && flag_noniso_default_format_attributes)
1793 /* Uniforum/GNU gettext functions, not in ISO C. */
1794 record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
1795 record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
1796 record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
1800 /* Record information for argument format checking. FUNCTION_IDENT is
1801 the identifier node for the name of the function to check (its decl
1802 need not exist yet).
1803 FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
1804 of the argument which is the format control string (starting from 1).
1805 FIRST_ARG_NUM is the number of the first actual argument to check
1806 against the format string, or zero if no checking is not be done
1807 (e.g. for varargs such as vfprintf). */
1810 record_function_format (name, assembler_name, format_type,
1811 format_num, first_arg_num)
1813 tree assembler_name;
1814 enum format_type format_type;
1818 function_format_info *info;
1820 /* Re-use existing structure if it's there. */
1822 for (info = function_format_list; info; info = info->next)
1824 if (info->name == name && info->assembler_name == assembler_name)
1829 info = (function_format_info *) xmalloc (sizeof (function_format_info));
1830 info->next = function_format_list;
1831 function_format_list = info;
1834 info->assembler_name = assembler_name;
1837 info->format_type = format_type;
1838 info->format_num = format_num;
1839 info->first_arg_num = first_arg_num;
1842 /* Record information for the names of function that modify the format
1843 argument to format functions. FUNCTION_IDENT is the identifier node for
1844 the name of the function (its decl need not exist yet) and FORMAT_NUM is
1845 the number of the argument which is the format control string (starting
1849 record_international_format (name, assembler_name, format_num)
1851 tree assembler_name;
1854 international_format_info *info;
1856 /* Re-use existing structure if it's there. */
1858 for (info = international_format_list; info; info = info->next)
1860 if (info->name == name && info->assembler_name == assembler_name)
1867 = (international_format_info *)
1868 xmalloc (sizeof (international_format_info));
1869 info->next = international_format_list;
1870 international_format_list = info;
1873 info->assembler_name = assembler_name;
1876 info->format_num = format_num;
1879 /* Check the argument list of a call to printf, scanf, etc.
1880 NAME is the function identifier.
1881 ASSEMBLER_NAME is the function's assembler identifier.
1882 (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
1883 PARAMS is the list of argument values. */
1886 check_function_format (status, name, assembler_name, params)
1889 tree assembler_name;
1892 function_format_info *info;
1894 /* See if this function is a format function. */
1895 for (info = function_format_list; info; info = info->next)
1897 if (info->assembler_name
1898 ? (info->assembler_name == assembler_name)
1899 : (info->name == name))
1901 /* Yup; check it. */
1902 check_format_info (status, info, params);
1908 /* This function replaces `warning' inside the printf format checking
1909 functions. If the `status' parameter is non-NULL, then it is
1910 dereferenced and set to 1 whenever a warning is caught. Otherwise
1911 it warns as usual by replicating the innards of the warning
1912 function from diagnostic.c. */
1914 status_warning VPARAMS ((int *status, const char *msgid, ...))
1916 #ifndef ANSI_PROTOTYPES
1921 diagnostic_context dc;
1927 VA_START (ap, msgid);
1929 #ifndef ANSI_PROTOTYPES
1930 status = va_arg (ap, int *);
1931 msgid = va_arg (ap, const char *);
1934 /* This duplicates the warning function behavior. */
1935 set_diagnostic_context
1936 (&dc, msgid, &ap, input_filename, lineno, /* warn = */ 1);
1937 report_diagnostic (&dc);
1943 /* Variables used by the checking of $ operand number formats. */
1944 static char *dollar_arguments_used = NULL;
1945 static int dollar_arguments_alloc = 0;
1946 static int dollar_arguments_count;
1947 static int dollar_first_arg_num;
1948 static int dollar_max_arg_used;
1949 static int dollar_format_warned;
1951 /* Initialize the checking for a format string that may contain $
1952 parameter number specifications; we will need to keep track of whether
1953 each parameter has been used. FIRST_ARG_NUM is the number of the first
1954 argument that is a parameter to the format, or 0 for a vprintf-style
1955 function; PARAMS is the list of arguments starting at this argument. */
1958 init_dollar_format_checking (first_arg_num, params)
1962 dollar_first_arg_num = first_arg_num;
1963 dollar_arguments_count = 0;
1964 dollar_max_arg_used = 0;
1965 dollar_format_warned = 0;
1966 if (first_arg_num > 0)
1970 dollar_arguments_count++;
1971 params = TREE_CHAIN (params);
1974 if (dollar_arguments_alloc < dollar_arguments_count)
1976 if (dollar_arguments_used)
1977 free (dollar_arguments_used);
1978 dollar_arguments_alloc = dollar_arguments_count;
1979 dollar_arguments_used = xmalloc (dollar_arguments_alloc);
1981 if (dollar_arguments_alloc)
1982 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1986 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1987 is set, it is an error if one is not found; otherwise, it is OK. If
1988 such a number is found, check whether it is within range and mark that
1989 numbered operand as being used for later checking. Returns the operand
1990 number if found and within range, zero if no such number was found and
1991 this is OK, or -1 on error. PARAMS points to the first operand of the
1992 format; PARAM_PTR is made to point to the parameter referred to. If
1993 a $ format is found, *FORMAT is updated to point just after it. */
1996 maybe_read_dollar_number (status, format, dollar_needed, params, param_ptr)
1998 const char **format;
2005 const char *fcp = *format;
2006 if (*fcp < '0' || *fcp > '9')
2010 status_warning (status, "missing $ operand number in format");
2018 while (*fcp >= '0' && *fcp <= '9')
2021 nargnum = 10 * argnum + (*fcp - '0');
2022 if (nargnum < 0 || nargnum / 10 != argnum)
2031 status_warning (status, "missing $ operand number in format");
2038 if (pedantic && !dollar_format_warned)
2040 status_warning (status, "ISO C does not support %%n$ operand number formats");
2041 dollar_format_warned = 1;
2043 if (overflow_flag || argnum == 0
2044 || (dollar_first_arg_num && argnum > dollar_arguments_count))
2046 status_warning (status, "operand number out of range in format");
2049 if (argnum > dollar_max_arg_used)
2050 dollar_max_arg_used = argnum;
2051 /* For vprintf-style functions we may need to allocate more memory to
2052 track which arguments are used. */
2053 while (dollar_arguments_alloc < dollar_max_arg_used)
2056 nalloc = 2 * dollar_arguments_alloc + 16;
2057 dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
2058 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
2059 nalloc - dollar_arguments_alloc);
2060 dollar_arguments_alloc = nalloc;
2062 dollar_arguments_used[argnum - 1] = 1;
2063 if (dollar_first_arg_num)
2066 *param_ptr = params;
2067 for (i = 1; i < argnum && *param_ptr != 0; i++)
2068 *param_ptr = TREE_CHAIN (*param_ptr);
2070 if (*param_ptr == 0)
2072 /* This case shouldn't be caught here. */
2082 /* Finish the checking for a format string that used $ operand number formats
2083 instead of non-$ formats. We check for unused operands before used ones
2084 (a serious error, since the implementation of the format function
2085 can't know what types to pass to va_arg to find the later arguments).
2086 and for unused operands at the end of the format (if we know how many
2087 arguments the format had, so not for vprintf). If there were operand
2088 numbers out of range on a non-vprintf-style format, we won't have reached
2092 finish_dollar_format_checking (status)
2096 for (i = 0; i < dollar_max_arg_used; i++)
2098 if (!dollar_arguments_used[i])
2099 status_warning (status, "format argument %d unused before used argument %d in $-style format",
2100 i + 1, dollar_max_arg_used);
2102 if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
2103 status_warning (status, "unused arguments in $-style format");
2107 /* Retrieve the specification for a format flag. SPEC contains the
2108 specifications for format flags for the applicable kind of format.
2109 FLAG is the flag in question. If PREDICATES is NULL, the basic
2110 spec for that flag must be retrieved and this function aborts if
2111 it cannot be found. If PREDICATES is not NULL, it is a string listing
2112 possible predicates for the spec entry; if an entry predicated on any
2113 of these is found, it is returned, otherwise NULL is returned. */
2115 static const format_flag_spec *
2116 get_flag_spec (spec, flag, predicates)
2117 const format_flag_spec *spec;
2119 const char *predicates;
2122 for (i = 0; spec[i].flag_char != 0; i++)
2124 if (spec[i].flag_char != flag)
2126 if (predicates != NULL)
2128 if (spec[i].predicate != 0
2129 && index (predicates, spec[i].predicate) != 0)
2132 else if (spec[i].predicate == 0)
2135 if (predicates == NULL)
2142 /* Check the argument list of a call to printf, scanf, etc.
2143 INFO points to the function_format_info structure.
2144 PARAMS is the list of argument values. */
2147 check_format_info (status, info, params)
2149 function_format_info *info;
2155 const char *length_chars = NULL;
2156 enum format_lengths length_chars_val = FMT_LEN_none;
2157 enum format_std_version length_chars_std = STD_C89;
2164 tree main_arg_params;
2165 enum format_std_version wanted_type_std;
2166 const char *wanted_type_name;
2167 format_wanted_type width_wanted_type;
2168 format_wanted_type precision_wanted_type;
2169 format_wanted_type main_wanted_type;
2170 format_wanted_type *first_wanted_type;
2171 format_wanted_type *last_wanted_type;
2172 tree first_fillin_param;
2173 const char *format_chars;
2174 const format_kind_info *fki = NULL;
2175 const format_flag_spec *flag_specs = NULL;
2176 const format_flag_pair *bad_flag_pairs = NULL;
2177 const format_length_info *fli = NULL;
2178 const format_char_info *fci = NULL;
2179 char flag_chars[256];
2180 /* -1 if no conversions taking an operand have been found; 0 if one has
2181 and it didn't use $; 1 if $ formats are in use. */
2182 int has_operand_number = -1;
2184 /* Skip to format argument. If the argument isn't available, there's
2185 no work for us to do; prototype checking will catch the problem. */
2186 for (arg_num = 1; ; ++arg_num)
2190 if (arg_num == info->format_num)
2192 params = TREE_CHAIN (params);
2194 format_tree = TREE_VALUE (params);
2195 params = TREE_CHAIN (params);
2196 if (format_tree == 0)
2199 /* We can only check the format if it's a string constant. */
2200 while (TREE_CODE (format_tree) == NOP_EXPR)
2201 format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
2203 if (TREE_CODE (format_tree) == CALL_EXPR
2204 && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
2205 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
2208 tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
2210 /* See if this is a call to a known internationalization function
2211 that modifies the format arg. */
2212 international_format_info *info;
2214 for (info = international_format_list; info; info = info->next)
2215 if (info->assembler_name
2216 ? (info->assembler_name == DECL_ASSEMBLER_NAME (function))
2217 : (info->name == DECL_NAME (function)))
2222 for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
2224 inner_args = TREE_CHAIN (inner_args), i++)
2225 if (i == info->format_num)
2227 format_tree = TREE_VALUE (inner_args);
2229 while (TREE_CODE (format_tree) == NOP_EXPR)
2230 format_tree = TREE_OPERAND (format_tree, 0);
2235 if (integer_zerop (format_tree))
2237 status_warning (status, "null format string");
2240 if (TREE_CODE (format_tree) != ADDR_EXPR)
2242 /* The user may get multiple warnings if the supplied argument
2243 isn't even a string pointer. */
2244 /* Functions taking a va_list normally pass a non-literal format
2245 string. These functions typically are declared with
2246 first_arg_num == 0, so avoid warning in those cases. */
2247 if (info->first_arg_num != 0 && warn_format > 1)
2248 status_warning (status, "format not a string literal, argument types not checked");
2251 format_tree = TREE_OPERAND (format_tree, 0);
2252 if (TREE_CODE (format_tree) != STRING_CST)
2254 /* The user may get multiple warnings if the supplied argument
2255 isn't even a string pointer. */
2256 /* Functions taking a va_list normally pass a non-literal format
2257 string. These functions typically are declared with
2258 first_arg_num == 0, so avoid warning in those cases. */
2259 if (info->first_arg_num != 0 && warn_format > 1)
2260 status_warning (status, "format not a string literal, argument types not checked");
2263 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
2265 status_warning (status, "format is a wide character string");
2268 format_chars = TREE_STRING_POINTER (format_tree);
2269 format_length = TREE_STRING_LENGTH (format_tree);
2270 if (format_length <= 1)
2271 status_warning (status, "zero-length format string");
2272 if (format_chars[--format_length] != 0)
2274 status_warning (status, "unterminated format string");
2277 /* Skip to first argument to check. */
2278 while (arg_num + 1 < info->first_arg_num)
2282 params = TREE_CHAIN (params);
2286 first_fillin_param = params;
2287 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2288 fki = &format_types[info->format_type];
2289 flag_specs = fki->flag_specs;
2290 bad_flag_pairs = fki->bad_flag_pairs;
2294 first_wanted_type = NULL;
2295 last_wanted_type = NULL;
2296 if (*format_chars == 0)
2298 if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
2299 status_warning (status, "embedded `\\0' in format");
2300 if (info->first_arg_num != 0 && params != 0
2301 && has_operand_number <= 0)
2302 status_warning (status, "too many arguments for format");
2303 if (has_operand_number > 0)
2304 finish_dollar_format_checking (status);
2307 if (*format_chars++ != '%')
2309 if (*format_chars == 0)
2311 status_warning (status, "spurious trailing `%%' in format");
2314 if (*format_chars == '%')
2322 main_arg_params = 0;
2324 if ((fki->flags & FMT_FLAG_ARG_CONVERT) && has_operand_number != 0)
2326 /* Possibly read a $ operand number at the start of the format.
2327 If one was previously used, one is required here. If one
2328 is not used here, we can't immediately conclude this is a
2329 format without them, since it could be printf %m or scanf %*. */
2331 opnum = maybe_read_dollar_number (status, &format_chars, 0,
2338 has_operand_number = 1;
2339 main_arg_num = opnum + info->first_arg_num - 1;
2343 /* Read any format flags, but do not yet validate them beyond removing
2344 duplicates, since in general validation depends on the rest of
2346 while (*format_chars != 0 && index (fki->flag_chars, *format_chars) != 0)
2348 if (index (flag_chars, *format_chars) != 0)
2350 const format_flag_spec *s = get_flag_spec (flag_specs,
2351 *format_chars, NULL);
2352 status_warning (status, "repeated %s in format", _(s->name));
2356 i = strlen (flag_chars);
2357 flag_chars[i++] = *format_chars;
2363 /* Read any format width, possibly * or *m$. */
2364 if (fki->width_char != 0)
2366 if (fki->width_type != NULL && *format_chars == '*')
2368 i = strlen (flag_chars);
2369 flag_chars[i++] = fki->width_char;
2371 /* "...a field width...may be indicated by an asterisk.
2372 In this case, an int argument supplies the field width..." */
2376 status_warning (status, "too few arguments for format");
2379 if (has_operand_number != 0)
2382 opnum = maybe_read_dollar_number (status, &format_chars,
2383 has_operand_number == 1,
2390 has_operand_number = 1;
2391 arg_num = opnum + info->first_arg_num - 1;
2394 has_operand_number = 0;
2396 if (info->first_arg_num != 0)
2398 cur_param = TREE_VALUE (params);
2399 if (has_operand_number <= 0)
2401 params = TREE_CHAIN (params);
2404 width_wanted_type.wanted_type = *fki->width_type;
2405 width_wanted_type.wanted_type_name = NULL;
2406 width_wanted_type.pointer_count = 0;
2407 width_wanted_type.char_lenient_flag = 0;
2408 width_wanted_type.writing_in_flag = 0;
2409 width_wanted_type.name = _("field width");
2410 width_wanted_type.param = cur_param;
2411 width_wanted_type.arg_num = arg_num;
2412 width_wanted_type.next = NULL;
2413 if (last_wanted_type != 0)
2414 last_wanted_type->next = &width_wanted_type;
2415 if (first_wanted_type == 0)
2416 first_wanted_type = &width_wanted_type;
2417 last_wanted_type = &width_wanted_type;
2422 /* Possibly read a numeric width. If the width is zero,
2423 we complain; for scanf this is bad according to the
2424 standard, and for printf and strftime it cannot occur
2425 because 0 is a flag. */
2426 int non_zero_width_char = FALSE;
2427 int found_width = FALSE;
2428 while (ISDIGIT (*format_chars))
2431 if (*format_chars != '0')
2432 non_zero_width_char = TRUE;
2435 if (found_width && !non_zero_width_char)
2436 status_warning (status, "zero width in scanf format");
2439 i = strlen (flag_chars);
2440 flag_chars[i++] = fki->width_char;
2446 /* Read any format precision, possibly * or *m$. */
2447 if (fki->precision_char != 0 && *format_chars == '.')
2450 i = strlen (flag_chars);
2451 flag_chars[i++] = fki->precision_char;
2453 if (fki->precision_type != NULL && *format_chars == '*')
2455 /* "...a...precision...may be indicated by an asterisk.
2456 In this case, an int argument supplies the...precision." */
2458 if (has_operand_number != 0)
2461 opnum = maybe_read_dollar_number (status, &format_chars,
2462 has_operand_number == 1,
2469 has_operand_number = 1;
2470 arg_num = opnum + info->first_arg_num - 1;
2473 has_operand_number = 0;
2475 if (info->first_arg_num != 0)
2479 status_warning (status, "too few arguments for format");
2482 cur_param = TREE_VALUE (params);
2483 if (has_operand_number <= 0)
2485 params = TREE_CHAIN (params);
2488 precision_wanted_type.wanted_type = *fki->precision_type;
2489 precision_wanted_type.wanted_type_name = NULL;
2490 precision_wanted_type.pointer_count = 0;
2491 precision_wanted_type.char_lenient_flag = 0;
2492 precision_wanted_type.writing_in_flag = 0;
2493 precision_wanted_type.name = _("field precision");
2494 precision_wanted_type.param = cur_param;
2495 precision_wanted_type.arg_num = arg_num;
2496 precision_wanted_type.next = NULL;
2497 if (last_wanted_type != 0)
2498 last_wanted_type->next = &precision_wanted_type;
2499 if (first_wanted_type == 0)
2500 first_wanted_type = &precision_wanted_type;
2501 last_wanted_type = &precision_wanted_type;
2506 while (ISDIGIT (*format_chars))
2511 /* Read any length modifier, if this kind of format has them. */
2512 fli = fki->length_char_specs;
2513 length_chars = NULL;
2514 length_chars_val = FMT_LEN_none;
2515 length_chars_std = STD_C89;
2518 while (fli->name != 0 && fli->name[0] != *format_chars)
2523 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2526 length_chars = fli->double_name;
2527 length_chars_val = fli->double_index;
2528 length_chars_std = fli->double_std;
2532 length_chars = fli->name;
2533 length_chars_val = fli->index;
2534 length_chars_std = fli->std;
2536 i = strlen (flag_chars);
2537 flag_chars[i++] = fki->length_code_char;
2542 /* Warn if the length modifier is non-standard. */
2543 if (length_chars_std == STD_EXT)
2544 status_warning (status, "ISO C does not support the `%s' %s length modifier",
2545 length_chars, fki->name);
2546 else if ((length_chars_std == STD_C99 && !flag_isoc99)
2547 || (length_chars_std == STD_C94 && !flag_isoc94))
2548 status_warning (status, "ISO C89 does not support the `%s' %s length modifier",
2549 length_chars, fki->name);
2553 /* Read any modifier (strftime E/O). */
2554 if (fki->modifier_chars != NULL)
2556 while (*format_chars != 0
2557 && index (fki->modifier_chars, *format_chars) != 0)
2559 if (index (flag_chars, *format_chars) != 0)
2561 const format_flag_spec *s = get_flag_spec (flag_specs,
2562 *format_chars, NULL);
2563 status_warning (status, "repeated %s in format", _(s->name));
2567 i = strlen (flag_chars);
2568 flag_chars[i++] = *format_chars;
2575 /* Handle the scanf allocation kludge. */
2576 if (fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
2578 if (*format_chars == 'a' && !flag_isoc99)
2580 if (format_chars[1] == 's' || format_chars[1] == 'S'
2581 || format_chars[1] == '[')
2583 /* `a' is used as a flag. */
2584 i = strlen (flag_chars);
2585 flag_chars[i++] = 'a';
2592 format_char = *format_chars;
2593 if (format_char == 0
2594 || (!(fki->flags & FMT_FLAG_FANCY_PERCENT_OK) && format_char == '%'))
2596 status_warning (status, "conversion lacks type at end of format");
2600 fci = fki->conversion_specs;
2601 while (fci->format_chars != 0
2602 && index (fci->format_chars, format_char) == 0)
2604 if (fci->format_chars == 0)
2606 if (ISGRAPH(format_char))
2607 status_warning (status, "unknown conversion type character `%c' in format",
2610 status_warning (status, "unknown conversion type character 0x%x in format",
2616 if (fci->std == STD_EXT)
2617 status_warning (status, "ISO C does not support the `%%%c' %s format",
2618 format_char, fki->name);
2619 else if ((fci->std == STD_C99 && !flag_isoc99)
2620 || (fci->std == STD_C94 && !flag_isoc94))
2621 status_warning (status, "ISO C89 does not support the `%%%c' %s format",
2622 format_char, fki->name);
2625 /* Validate the individual flags used, removing any that are invalid. */
2628 for (i = 0; flag_chars[i] != 0; i++)
2630 const format_flag_spec *s = get_flag_spec (flag_specs,
2631 flag_chars[i], NULL);
2632 flag_chars[i - d] = flag_chars[i];
2633 if (flag_chars[i] == fki->length_code_char)
2635 if (index (fci->flag_chars, flag_chars[i]) == 0)
2637 status_warning (status, "%s used with `%%%c' %s format",
2638 _(s->name), format_char, fki->name);
2644 const format_flag_spec *t;
2645 if (s->std == STD_EXT)
2646 status_warning (status, "ISO C does not support %s",
2648 else if ((s->std == STD_C99 && !flag_isoc99)
2649 || (s->std == STD_C94 && !flag_isoc94))
2650 status_warning (status, "ISO C89 does not support %s",
2652 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
2653 if (t != NULL && t->std > s->std)
2655 const char *long_name = (t->long_name != NULL
2658 if (t->std == STD_EXT)
2659 status_warning (status, "ISO C does not support %s with the `%%%c' %s format",
2660 _(long_name), format_char, fki->name);
2661 else if ((t->std == STD_C99 && !flag_isoc99)
2662 || (t->std == STD_C94 && !flag_isoc94))
2663 status_warning (status, "ISO C89 does not support %s with the `%%%c' %s format",
2664 _(long_name), format_char, fki->name);
2668 flag_chars[i - d] = 0;
2672 if ((fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
2673 && index (flag_chars, 'a') != 0)
2676 if (fki->suppression_char
2677 && index (flag_chars, fki->suppression_char) != 0)
2680 /* Validate the pairs of flags used. */
2681 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2683 const format_flag_spec *s, *t;
2684 if (index (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
2686 if (index (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
2688 if (bad_flag_pairs[i].predicate != 0
2689 && index (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2691 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
2692 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
2693 if (bad_flag_pairs[i].ignored)
2695 if (bad_flag_pairs[i].predicate != 0)
2696 status_warning (status, "%s ignored with %s and `%%%c' %s format",
2697 _(s->name), _(t->name), format_char,
2700 status_warning (status, "%s ignored with %s in %s format",
2701 _(s->name), _(t->name), fki->name);
2705 if (bad_flag_pairs[i].predicate != 0)
2706 status_warning (status, "use of %s and %s together with `%%%c' %s format",
2707 _(s->name), _(t->name), format_char,
2710 status_warning (status, "use of %s and %s together in %s format",
2711 _(s->name), _(t->name), fki->name);
2715 /* Give Y2K warnings. */
2718 if (index (fci->flags2, '4') != 0)
2719 if (index (flag_chars, 'E') != 0)
2723 else if (index (fci->flags2, '3') != 0)
2725 else if (index (fci->flags2, '2') != 0)
2728 status_warning (status, "`%%%c' yields only last 2 digits of year in some locales",
2730 else if (y2k_level == 2)
2731 status_warning (status, "`%%%c' yields only last 2 digits of year", format_char);
2734 if (index (fci->flags2, '[') != 0)
2736 /* Skip over scan set, in case it happens to have '%' in it. */
2737 if (*format_chars == '^')
2739 /* Find closing bracket; if one is hit immediately, then
2740 it's part of the scan set rather than a terminator. */
2741 if (*format_chars == ']')
2743 while (*format_chars && *format_chars != ']')
2745 if (*format_chars != ']')
2746 /* The end of the format string was reached. */
2747 status_warning (status, "no closing `]' for `%%[' format");
2750 if (fki->flags & FMT_FLAG_ARG_CONVERT)
2752 wanted_type = (fci->types[length_chars_val].type
2753 ? *fci->types[length_chars_val].type : 0);
2754 wanted_type_name = fci->types[length_chars_val].name;
2755 wanted_type_std = fci->types[length_chars_val].std;
2756 if (wanted_type == 0)
2758 status_warning (status, "use of `%s' length modifier with `%c' type character",
2759 length_chars, format_char);
2760 /* Heuristic: skip one argument when an invalid length/type
2761 combination is encountered. */
2765 status_warning (status, "too few arguments for format");
2768 params = TREE_CHAIN (params);
2772 /* Warn if non-standard, provided it is more non-standard
2773 than the length and type characters that may already
2774 have been warned for. */
2775 && wanted_type_std > length_chars_std
2776 && wanted_type_std > fci->std)
2778 if (wanted_type_std == STD_EXT)
2779 status_warning (status, "ISO C does not support the `%%%s%c' %s format",
2780 length_chars, format_char, fki->name);
2781 else if ((wanted_type_std == STD_C99 && !flag_isoc99)
2782 || (wanted_type_std == STD_C94 && !flag_isoc94))
2783 status_warning (status, "ISO C89 does not support the `%%%s%c' %s format",
2784 length_chars, format_char, fki->name);
2788 /* Finally. . .check type of argument against desired type! */
2789 if (info->first_arg_num == 0)
2791 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
2794 if (main_arg_num != 0)
2797 status_warning (status, "operand number specified with suppressed assignment");
2799 status_warning (status, "operand number specified for format taking no argument");
2804 if (main_arg_num != 0)
2806 arg_num = main_arg_num;
2807 params = main_arg_params;
2812 if (has_operand_number > 0)
2814 status_warning (status, "missing $ operand number in format");
2818 has_operand_number = 0;
2821 status_warning (status, "too few arguments for format");
2825 cur_param = TREE_VALUE (params);
2826 params = TREE_CHAIN (params);
2827 main_wanted_type.wanted_type = wanted_type;
2828 main_wanted_type.wanted_type_name = wanted_type_name;
2829 main_wanted_type.pointer_count = fci->pointer_count + aflag;
2830 main_wanted_type.char_lenient_flag = 0;
2831 if (index (fci->flags2, 'c') != 0)
2832 main_wanted_type.char_lenient_flag = 1;
2833 main_wanted_type.writing_in_flag = 0;
2834 if (index (fci->flags2, 'W') != 0)
2835 main_wanted_type.writing_in_flag = 1;
2836 main_wanted_type.name = NULL;
2837 main_wanted_type.param = cur_param;
2838 main_wanted_type.arg_num = arg_num;
2839 main_wanted_type.next = NULL;
2840 if (last_wanted_type != 0)
2841 last_wanted_type->next = &main_wanted_type;
2842 if (first_wanted_type == 0)
2843 first_wanted_type = &main_wanted_type;
2844 last_wanted_type = &main_wanted_type;
2847 if (first_wanted_type != 0)
2848 check_format_types (status, first_wanted_type);
2854 /* Check the argument types from a single format conversion (possibly
2855 including width and precision arguments). */
2857 check_format_types (status, types)
2859 format_wanted_type *types;
2861 for (; types != 0; types = types->next)
2871 cur_param = types->param;
2872 cur_type = TREE_TYPE (cur_param);
2873 if (TREE_CODE (cur_type) == ERROR_MARK)
2876 wanted_type = types->wanted_type;
2877 arg_num = types->arg_num;
2879 /* The following should not occur here. */
2880 if (wanted_type == 0)
2882 if (wanted_type == void_type_node && types->pointer_count == 0)
2885 if (types->pointer_count == 0)
2887 promoted_type = simple_type_promotes_to (wanted_type);
2888 if (promoted_type != NULL_TREE)
2889 wanted_type = promoted_type;
2892 STRIP_NOPS (cur_param);
2894 /* Check the types of any additional pointer arguments
2895 that precede the "real" argument. */
2896 for (i = 0; i < types->pointer_count; ++i)
2898 if (TREE_CODE (cur_type) == POINTER_TYPE)
2900 cur_type = TREE_TYPE (cur_type);
2901 if (TREE_CODE (cur_type) == ERROR_MARK)
2904 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2905 cur_param = TREE_OPERAND (cur_param, 0);
2909 /* See if this is an attempt to write into a const type with
2910 scanf or with printf "%n". Note: the writing in happens
2911 at the first indirection only, if for example
2912 void * const * is passed to scanf %p; passing
2913 const void ** is simply passing an incompatible type. */
2914 if (types->writing_in_flag
2916 && (TYPE_READONLY (cur_type)
2918 && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
2919 || (DECL_P (cur_param)
2920 && TREE_READONLY (cur_param))))))
2921 status_warning (status, "writing into constant object (arg %d)", arg_num);
2923 /* If there are extra type qualifiers beyond the first
2924 indirection, then this makes the types technically
2928 && (TYPE_READONLY (cur_type)
2929 || TYPE_VOLATILE (cur_type)
2930 || TYPE_RESTRICT (cur_type)))
2931 status_warning (status, "extra type qualifiers in format argument (arg %d)",
2937 if (types->pointer_count == 1)
2938 status_warning (status, "format argument is not a pointer (arg %d)", arg_num);
2940 status_warning (status, "format argument is not a pointer to a pointer (arg %d)", arg_num);
2945 if (i < types->pointer_count)
2948 orig_cur_type = cur_type;
2949 cur_type = TYPE_MAIN_VARIANT (cur_type);
2951 /* Check whether the argument type is a character type. This leniency
2952 only applies to certain formats, flagged with 'c'.
2954 if (types->char_lenient_flag)
2955 char_type_flag = (cur_type == char_type_node
2956 || cur_type == signed_char_type_node
2957 || cur_type == unsigned_char_type_node);
2959 /* Check the type of the "real" argument, if there's a type we want. */
2960 if (wanted_type == cur_type)
2962 /* If we want `void *', allow any pointer type.
2963 (Anything else would already have got a warning.)
2964 With -pedantic, only allow pointers to void and to character
2966 if (wanted_type == void_type_node
2967 && (!pedantic || (i == 1 && char_type_flag)))
2969 /* Don't warn about differences merely in signedness, unless
2970 -pedantic. With -pedantic, warn if the type is a pointer
2971 target and not a character type, and for character types at
2972 a second level of indirection. */
2973 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2974 && TREE_CODE (cur_type) == INTEGER_TYPE
2975 && (! pedantic || i == 0 || (i == 1 && char_type_flag))
2976 && (TREE_UNSIGNED (wanted_type)
2977 ? wanted_type == unsigned_type (cur_type)
2978 : wanted_type == signed_type (cur_type)))
2980 /* Likewise, "signed char", "unsigned char" and "char" are
2981 equivalent but the above test won't consider them equivalent. */
2982 if (wanted_type == char_type_node
2983 && (! pedantic || i < 2)
2986 /* Now we have a type mismatch. */
2988 register const char *this;
2989 register const char *that;
2991 this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
2993 if (TYPE_NAME (orig_cur_type) != 0
2994 && TREE_CODE (orig_cur_type) != INTEGER_TYPE
2995 && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
2996 && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
2998 if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
2999 && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
3000 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
3002 that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
3005 /* A nameless type can't possibly match what the format wants.
3006 So there will be a warning for it.
3007 Make up a string to describe vaguely what it is. */
3010 if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
3013 that = "different type";
3016 /* Make the warning better in case of mismatch of int vs long. */
3017 if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
3018 && TREE_CODE (wanted_type) == INTEGER_TYPE
3019 && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
3020 && TYPE_NAME (orig_cur_type) != 0
3021 && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
3022 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
3024 if (strcmp (this, that) != 0)
3026 /* There may be a better name for the format, e.g. size_t,
3027 but we should allow for programs with a perverse typedef
3028 making size_t something other than what the compiler
3030 if (types->wanted_type_name != 0
3031 && strcmp (types->wanted_type_name, that) != 0)
3032 this = types->wanted_type_name;
3033 if (types->name != 0)
3034 status_warning (status, "%s is not type %s (arg %d)", types->name, this,
3037 status_warning (status, "%s format, %s arg (arg %d)", this, that, arg_num);
3043 /* Print a warning if a constant expression had overflow in folding.
3044 Invoke this function on every expression that the language
3045 requires to be a constant expression.
3046 Note the ANSI C standard says it is erroneous for a
3047 constant expression to overflow. */
3050 constant_expression_warning (value)
3053 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
3054 || TREE_CODE (value) == COMPLEX_CST)
3055 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
3056 pedwarn ("overflow in constant expression");
3059 /* Print a warning if an expression had overflow in folding.
3060 Invoke this function on every expression that
3061 (1) appears in the source code, and
3062 (2) might be a constant expression that overflowed, and
3063 (3) is not already checked by convert_and_check;
3064 however, do not invoke this function on operands of explicit casts. */
3067 overflow_warning (value)
3070 if ((TREE_CODE (value) == INTEGER_CST
3071 || (TREE_CODE (value) == COMPLEX_CST
3072 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
3073 && TREE_OVERFLOW (value))
3075 TREE_OVERFLOW (value) = 0;
3076 if (skip_evaluation == 0)
3077 warning ("integer overflow in expression");
3079 else if ((TREE_CODE (value) == REAL_CST
3080 || (TREE_CODE (value) == COMPLEX_CST
3081 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
3082 && TREE_OVERFLOW (value))
3084 TREE_OVERFLOW (value) = 0;
3085 if (skip_evaluation == 0)
3086 warning ("floating point overflow in expression");
3090 /* Print a warning if a large constant is truncated to unsigned,
3091 or if -Wconversion is used and a constant < 0 is converted to unsigned.
3092 Invoke this function on every expression that might be implicitly
3093 converted to an unsigned type. */
3096 unsigned_conversion_warning (result, operand)
3097 tree result, operand;
3099 if (TREE_CODE (operand) == INTEGER_CST
3100 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
3101 && TREE_UNSIGNED (TREE_TYPE (result))
3102 && skip_evaluation == 0
3103 && !int_fits_type_p (operand, TREE_TYPE (result)))
3105 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
3106 /* This detects cases like converting -129 or 256 to unsigned char. */
3107 warning ("large integer implicitly truncated to unsigned type");
3108 else if (warn_conversion)
3109 warning ("negative integer implicitly converted to unsigned type");
3113 /* Convert EXPR to TYPE, warning about conversion problems with constants.
3114 Invoke this function on every expression that is converted implicitly,
3115 i.e. because of language rules and not because of an explicit cast. */
3118 convert_and_check (type, expr)
3121 tree t = convert (type, expr);
3122 if (TREE_CODE (t) == INTEGER_CST)
3124 if (TREE_OVERFLOW (t))
3126 TREE_OVERFLOW (t) = 0;
3128 /* Do not diagnose overflow in a constant expression merely
3129 because a conversion overflowed. */
3130 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
3132 /* No warning for converting 0x80000000 to int. */
3133 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
3134 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
3135 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
3136 /* If EXPR fits in the unsigned version of TYPE,
3137 don't warn unless pedantic. */
3139 || TREE_UNSIGNED (type)
3140 || ! int_fits_type_p (expr, unsigned_type (type)))
3141 && skip_evaluation == 0)
3142 warning ("overflow in implicit constant conversion");
3145 unsigned_conversion_warning (t, expr);
3151 c_expand_expr_stmt (expr)
3154 /* Do default conversion if safe and possibly important,
3155 in case within ({...}). */
3156 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
3157 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
3158 expr = default_conversion (expr);
3160 if (TREE_TYPE (expr) != error_mark_node
3161 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
3162 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
3163 error ("expression statement has incomplete type");
3165 last_expr_type = TREE_TYPE (expr);
3166 add_stmt (build_stmt (EXPR_STMT, expr));
3169 /* Validate the expression after `case' and apply default promotions. */
3172 check_case_value (value)
3175 if (value == NULL_TREE)
3178 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3179 STRIP_TYPE_NOPS (value);
3180 /* In C++, the following is allowed:
3183 switch (...) { case i: ... }
3185 So, we try to reduce the VALUE to a constant that way. */
3186 if (c_language == clk_cplusplus)
3188 value = decl_constant_value (value);
3189 STRIP_TYPE_NOPS (value);
3190 value = fold (value);
3193 if (TREE_CODE (value) != INTEGER_CST
3194 && value != error_mark_node)
3196 error ("case label does not reduce to an integer constant");
3197 value = error_mark_node;
3200 /* Promote char or short to int. */
3201 value = default_conversion (value);
3203 constant_expression_warning (value);
3208 /* Return an integer type with BITS bits of precision,
3209 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
3212 type_for_size (bits, unsignedp)
3216 if (bits == TYPE_PRECISION (integer_type_node))
3217 return unsignedp ? unsigned_type_node : integer_type_node;
3219 if (bits == TYPE_PRECISION (signed_char_type_node))
3220 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3222 if (bits == TYPE_PRECISION (short_integer_type_node))
3223 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3225 if (bits == TYPE_PRECISION (long_integer_type_node))
3226 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3228 if (bits == TYPE_PRECISION (long_long_integer_type_node))
3229 return (unsignedp ? long_long_unsigned_type_node
3230 : long_long_integer_type_node);
3232 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
3233 return (unsignedp ? widest_unsigned_literal_type_node
3234 : widest_integer_literal_type_node);
3236 if (bits <= TYPE_PRECISION (intQI_type_node))
3237 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3239 if (bits <= TYPE_PRECISION (intHI_type_node))
3240 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3242 if (bits <= TYPE_PRECISION (intSI_type_node))
3243 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3245 if (bits <= TYPE_PRECISION (intDI_type_node))
3246 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3251 /* Return a data type that has machine mode MODE.
3252 If the mode is an integer,
3253 then UNSIGNEDP selects between signed and unsigned types. */
3256 type_for_mode (mode, unsignedp)
3257 enum machine_mode mode;
3260 if (mode == TYPE_MODE (integer_type_node))
3261 return unsignedp ? unsigned_type_node : integer_type_node;
3263 if (mode == TYPE_MODE (signed_char_type_node))
3264 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3266 if (mode == TYPE_MODE (short_integer_type_node))
3267 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3269 if (mode == TYPE_MODE (long_integer_type_node))
3270 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3272 if (mode == TYPE_MODE (long_long_integer_type_node))
3273 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
3275 if (mode == TYPE_MODE (widest_integer_literal_type_node))
3276 return unsignedp ? widest_unsigned_literal_type_node
3277 : widest_integer_literal_type_node;
3279 if (mode == TYPE_MODE (intQI_type_node))
3280 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3282 if (mode == TYPE_MODE (intHI_type_node))
3283 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3285 if (mode == TYPE_MODE (intSI_type_node))
3286 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3288 if (mode == TYPE_MODE (intDI_type_node))
3289 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3291 #if HOST_BITS_PER_WIDE_INT >= 64
3292 if (mode == TYPE_MODE (intTI_type_node))
3293 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3296 if (mode == TYPE_MODE (float_type_node))
3297 return float_type_node;
3299 if (mode == TYPE_MODE (double_type_node))
3300 return double_type_node;
3302 if (mode == TYPE_MODE (long_double_type_node))
3303 return long_double_type_node;
3305 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
3306 return build_pointer_type (char_type_node);
3308 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
3309 return build_pointer_type (integer_type_node);
3311 #ifdef VECTOR_MODE_SUPPORTED_P
3312 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3313 return V4SF_type_node;
3314 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3315 return V4SI_type_node;
3316 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3317 return V2SI_type_node;
3318 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3319 return V4HI_type_node;
3320 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3321 return V8QI_type_node;
3327 /* Return an unsigned type the same as TYPE in other respects. */
3329 unsigned_type (type)
3332 tree type1 = TYPE_MAIN_VARIANT (type);
3333 if (type1 == signed_char_type_node || type1 == char_type_node)
3334 return unsigned_char_type_node;
3335 if (type1 == integer_type_node)
3336 return unsigned_type_node;
3337 if (type1 == short_integer_type_node)
3338 return short_unsigned_type_node;
3339 if (type1 == long_integer_type_node)
3340 return long_unsigned_type_node;
3341 if (type1 == long_long_integer_type_node)
3342 return long_long_unsigned_type_node;
3343 if (type1 == widest_integer_literal_type_node)
3344 return widest_unsigned_literal_type_node;
3345 #if HOST_BITS_PER_WIDE_INT >= 64
3346 if (type1 == intTI_type_node)
3347 return unsigned_intTI_type_node;
3349 if (type1 == intDI_type_node)
3350 return unsigned_intDI_type_node;
3351 if (type1 == intSI_type_node)
3352 return unsigned_intSI_type_node;
3353 if (type1 == intHI_type_node)
3354 return unsigned_intHI_type_node;
3355 if (type1 == intQI_type_node)
3356 return unsigned_intQI_type_node;
3358 return signed_or_unsigned_type (1, type);
3361 /* Return a signed type the same as TYPE in other respects. */
3367 tree type1 = TYPE_MAIN_VARIANT (type);
3368 if (type1 == unsigned_char_type_node || type1 == char_type_node)
3369 return signed_char_type_node;
3370 if (type1 == unsigned_type_node)
3371 return integer_type_node;
3372 if (type1 == short_unsigned_type_node)
3373 return short_integer_type_node;
3374 if (type1 == long_unsigned_type_node)
3375 return long_integer_type_node;
3376 if (type1 == long_long_unsigned_type_node)
3377 return long_long_integer_type_node;
3378 if (type1 == widest_unsigned_literal_type_node)
3379 return widest_integer_literal_type_node;
3380 #if HOST_BITS_PER_WIDE_INT >= 64
3381 if (type1 == unsigned_intTI_type_node)
3382 return intTI_type_node;
3384 if (type1 == unsigned_intDI_type_node)
3385 return intDI_type_node;
3386 if (type1 == unsigned_intSI_type_node)
3387 return intSI_type_node;
3388 if (type1 == unsigned_intHI_type_node)
3389 return intHI_type_node;
3390 if (type1 == unsigned_intQI_type_node)
3391 return intQI_type_node;
3393 return signed_or_unsigned_type (0, type);
3396 /* Return a type the same as TYPE except unsigned or
3397 signed according to UNSIGNEDP. */
3400 signed_or_unsigned_type (unsignedp, type)
3404 if (! INTEGRAL_TYPE_P (type)
3405 || TREE_UNSIGNED (type) == unsignedp)
3408 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
3409 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3410 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
3411 return unsignedp ? unsigned_type_node : integer_type_node;
3412 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
3413 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3414 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
3415 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3416 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
3417 return (unsignedp ? long_long_unsigned_type_node
3418 : long_long_integer_type_node);
3419 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
3420 return (unsignedp ? widest_unsigned_literal_type_node
3421 : widest_integer_literal_type_node);
3425 /* Return the minimum number of bits needed to represent VALUE in a
3426 signed or unsigned type, UNSIGNEDP says which. */
3429 min_precision (value, unsignedp)
3435 /* If the value is negative, compute its negative minus 1. The latter
3436 adjustment is because the absolute value of the largest negative value
3437 is one larger than the largest positive value. This is equivalent to
3438 a bit-wise negation, so use that operation instead. */
3440 if (tree_int_cst_sgn (value) < 0)
3441 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
3443 /* Return the number of bits needed, taking into account the fact
3444 that we need one more bit for a signed than unsigned type. */
3446 if (integer_zerop (value))
3449 log = tree_floor_log2 (value);
3451 return log + 1 + ! unsignedp;
3454 /* Print an error message for invalid operands to arith operation CODE.
3455 NOP_EXPR is used as a special case (see truthvalue_conversion). */
3458 binary_op_error (code)
3459 enum tree_code code;
3461 register const char *opname;
3466 error ("invalid truth-value expression");
3470 opname = "+"; break;
3472 opname = "-"; break;
3474 opname = "*"; break;
3476 opname = "max"; break;
3478 opname = "min"; break;
3480 opname = "=="; break;
3482 opname = "!="; break;
3484 opname = "<="; break;
3486 opname = ">="; break;
3488 opname = "<"; break;
3490 opname = ">"; break;
3492 opname = "<<"; break;
3494 opname = ">>"; break;
3495 case TRUNC_MOD_EXPR:
3496 case FLOOR_MOD_EXPR:
3497 opname = "%"; break;
3498 case TRUNC_DIV_EXPR:
3499 case FLOOR_DIV_EXPR:
3500 opname = "/"; break;
3502 opname = "&"; break;
3504 opname = "|"; break;
3505 case TRUTH_ANDIF_EXPR:
3506 opname = "&&"; break;
3507 case TRUTH_ORIF_EXPR:
3508 opname = "||"; break;
3510 opname = "^"; break;
3513 opname = "rotate"; break;
3515 opname = "unknown"; break;
3517 error ("invalid operands to binary %s", opname);
3520 /* Subroutine of build_binary_op, used for comparison operations.
3521 See if the operands have both been converted from subword integer types
3522 and, if so, perhaps change them both back to their original type.
3523 This function is also responsible for converting the two operands
3524 to the proper common type for comparison.
3526 The arguments of this function are all pointers to local variables
3527 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
3528 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
3530 If this function returns nonzero, it means that the comparison has
3531 a constant value. What this function returns is an expression for
3535 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
3536 tree *op0_ptr, *op1_ptr;
3538 enum tree_code *rescode_ptr;
3541 tree op0 = *op0_ptr;
3542 tree op1 = *op1_ptr;
3543 int unsignedp0, unsignedp1;
3545 tree primop0, primop1;
3546 enum tree_code code = *rescode_ptr;
3548 /* Throw away any conversions to wider types
3549 already present in the operands. */
3551 primop0 = get_narrower (op0, &unsignedp0);
3552 primop1 = get_narrower (op1, &unsignedp1);
3554 /* Handle the case that OP0 does not *contain* a conversion
3555 but it *requires* conversion to FINAL_TYPE. */
3557 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
3558 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
3559 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
3560 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
3562 /* If one of the operands must be floated, we cannot optimize. */
3563 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
3564 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
3566 /* If first arg is constant, swap the args (changing operation
3567 so value is preserved), for canonicalization. Don't do this if
3568 the second arg is 0. */
3570 if (TREE_CONSTANT (primop0)
3571 && ! integer_zerop (primop1) && ! real_zerop (primop1))
3573 register tree tem = primop0;
3574 register int temi = unsignedp0;
3582 unsignedp0 = unsignedp1;
3605 *rescode_ptr = code;
3608 /* If comparing an integer against a constant more bits wide,
3609 maybe we can deduce a value of 1 or 0 independent of the data.
3610 Or else truncate the constant now
3611 rather than extend the variable at run time.
3613 This is only interesting if the constant is the wider arg.
3614 Also, it is not safe if the constant is unsigned and the
3615 variable arg is signed, since in this case the variable
3616 would be sign-extended and then regarded as unsigned.
3617 Our technique fails in this case because the lowest/highest
3618 possible unsigned results don't follow naturally from the
3619 lowest/highest possible values of the variable operand.
3620 For just EQ_EXPR and NE_EXPR there is another technique that
3621 could be used: see if the constant can be faithfully represented
3622 in the other operand's type, by truncating it and reextending it
3623 and see if that preserves the constant's value. */
3625 if (!real1 && !real2
3626 && TREE_CODE (primop1) == INTEGER_CST
3627 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
3629 int min_gt, max_gt, min_lt, max_lt;
3630 tree maxval, minval;
3631 /* 1 if comparison is nominally unsigned. */
3632 int unsignedp = TREE_UNSIGNED (*restype_ptr);
3635 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
3637 /* If TYPE is an enumeration, then we need to get its min/max
3638 values from it's underlying integral type, not the enumerated
3640 if (TREE_CODE (type) == ENUMERAL_TYPE)
3641 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
3643 maxval = TYPE_MAX_VALUE (type);
3644 minval = TYPE_MIN_VALUE (type);
3646 if (unsignedp && !unsignedp0)
3647 *restype_ptr = signed_type (*restype_ptr);
3649 if (TREE_TYPE (primop1) != *restype_ptr)
3650 primop1 = convert (*restype_ptr, primop1);
3651 if (type != *restype_ptr)
3653 minval = convert (*restype_ptr, minval);
3654 maxval = convert (*restype_ptr, maxval);
3657 if (unsignedp && unsignedp0)
3659 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
3660 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
3661 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
3662 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
3666 min_gt = INT_CST_LT (primop1, minval);
3667 max_gt = INT_CST_LT (primop1, maxval);
3668 min_lt = INT_CST_LT (minval, primop1);
3669 max_lt = INT_CST_LT (maxval, primop1);
3673 /* This used to be a switch, but Genix compiler can't handle that. */
3674 if (code == NE_EXPR)
3676 if (max_lt || min_gt)
3677 val = boolean_true_node;
3679 else if (code == EQ_EXPR)
3681 if (max_lt || min_gt)
3682 val = boolean_false_node;
3684 else if (code == LT_EXPR)
3687 val = boolean_true_node;
3689 val = boolean_false_node;
3691 else if (code == GT_EXPR)
3694 val = boolean_true_node;
3696 val = boolean_false_node;
3698 else if (code == LE_EXPR)
3701 val = boolean_true_node;
3703 val = boolean_false_node;
3705 else if (code == GE_EXPR)
3708 val = boolean_true_node;
3710 val = boolean_false_node;
3713 /* If primop0 was sign-extended and unsigned comparison specd,
3714 we did a signed comparison above using the signed type bounds.
3715 But the comparison we output must be unsigned.
3717 Also, for inequalities, VAL is no good; but if the signed
3718 comparison had *any* fixed result, it follows that the
3719 unsigned comparison just tests the sign in reverse
3720 (positive values are LE, negative ones GE).
3721 So we can generate an unsigned comparison
3722 against an extreme value of the signed type. */
3724 if (unsignedp && !unsignedp0)
3731 primop1 = TYPE_MIN_VALUE (type);
3737 primop1 = TYPE_MAX_VALUE (type);
3744 type = unsigned_type (type);
3747 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3749 /* This is the case of (char)x >?< 0x80, which people used to use
3750 expecting old C compilers to change the 0x80 into -0x80. */
3751 if (val == boolean_false_node)
3752 warning ("comparison is always false due to limited range of data type");
3753 if (val == boolean_true_node)
3754 warning ("comparison is always true due to limited range of data type");
3757 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3759 /* This is the case of (unsigned char)x >?< -1 or < 0. */
3760 if (val == boolean_false_node)
3761 warning ("comparison is always false due to limited range of data type");
3762 if (val == boolean_true_node)
3763 warning ("comparison is always true due to limited range of data type");
3768 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3769 if (TREE_SIDE_EFFECTS (primop0))
3770 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
3774 /* Value is not predetermined, but do the comparison
3775 in the type of the operand that is not constant.
3776 TYPE is already properly set. */
3778 else if (real1 && real2
3779 && (TYPE_PRECISION (TREE_TYPE (primop0))
3780 == TYPE_PRECISION (TREE_TYPE (primop1))))
3781 type = TREE_TYPE (primop0);
3783 /* If args' natural types are both narrower than nominal type
3784 and both extend in the same manner, compare them
3785 in the type of the wider arg.
3786 Otherwise must actually extend both to the nominal
3787 common type lest different ways of extending
3789 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
3791 else if (unsignedp0 == unsignedp1 && real1 == real2
3792 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
3793 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
3795 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3796 type = signed_or_unsigned_type (unsignedp0
3797 || TREE_UNSIGNED (*restype_ptr),
3799 /* Make sure shorter operand is extended the right way
3800 to match the longer operand. */
3801 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
3803 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
3808 /* Here we must do the comparison on the nominal type
3809 using the args exactly as we received them. */
3810 type = *restype_ptr;
3814 if (!real1 && !real2 && integer_zerop (primop1)
3815 && TREE_UNSIGNED (*restype_ptr))
3821 /* All unsigned values are >= 0, so we warn if extra warnings
3822 are requested. However, if OP0 is a constant that is
3823 >= 0, the signedness of the comparison isn't an issue,
3824 so suppress the warning. */
3825 if (extra_warnings && !in_system_header
3826 && ! (TREE_CODE (primop0) == INTEGER_CST
3827 && ! TREE_OVERFLOW (convert (signed_type (type),
3829 warning ("comparison of unsigned expression >= 0 is always true");
3830 value = boolean_true_node;
3834 if (extra_warnings && !in_system_header
3835 && ! (TREE_CODE (primop0) == INTEGER_CST
3836 && ! TREE_OVERFLOW (convert (signed_type (type),
3838 warning ("comparison of unsigned expression < 0 is always false");
3839 value = boolean_false_node;
3848 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3849 if (TREE_SIDE_EFFECTS (primop0))
3850 return build (COMPOUND_EXPR, TREE_TYPE (value),
3857 *op0_ptr = convert (type, primop0);
3858 *op1_ptr = convert (type, primop1);
3860 *restype_ptr = boolean_type_node;
3865 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
3866 or validate its data type for an `if' or `while' statement or ?..: exp.
3868 This preparation consists of taking the ordinary
3869 representation of an expression expr and producing a valid tree
3870 boolean expression describing whether expr is nonzero. We could
3871 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
3872 but we optimize comparisons, &&, ||, and !.
3874 The resulting type should always be `boolean_type_node'. */
3877 truthvalue_conversion (expr)
3880 if (TREE_CODE (expr) == ERROR_MARK)
3883 #if 0 /* This appears to be wrong for C++. */
3884 /* These really should return error_mark_node after 2.4 is stable.
3885 But not all callers handle ERROR_MARK properly. */
3886 switch (TREE_CODE (TREE_TYPE (expr)))
3889 error ("struct type value used where scalar is required");
3890 return boolean_false_node;
3893 error ("union type value used where scalar is required");
3894 return boolean_false_node;
3897 error ("array type value used where scalar is required");
3898 return boolean_false_node;
3905 switch (TREE_CODE (expr))
3908 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3909 case TRUTH_ANDIF_EXPR:
3910 case TRUTH_ORIF_EXPR:
3911 case TRUTH_AND_EXPR:
3913 case TRUTH_XOR_EXPR:
3914 case TRUTH_NOT_EXPR:
3915 TREE_TYPE (expr) = boolean_type_node;
3922 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
3925 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
3928 /* If we are taking the address of a external decl, it might be zero
3929 if it is weak, so we cannot optimize. */
3930 if (DECL_P (TREE_OPERAND (expr, 0))
3931 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
3934 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
3935 return build (COMPOUND_EXPR, boolean_type_node,
3936 TREE_OPERAND (expr, 0), boolean_true_node);
3938 return boolean_true_node;
3941 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
3942 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3943 truthvalue_conversion (TREE_OPERAND (expr, 0)),
3944 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3951 /* These don't change whether an object is non-zero or zero. */
3952 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3956 /* These don't change whether an object is zero or non-zero, but
3957 we can't ignore them if their second arg has side-effects. */
3958 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
3959 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
3960 truthvalue_conversion (TREE_OPERAND (expr, 0)));
3962 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3965 /* Distribute the conversion into the arms of a COND_EXPR. */
3966 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
3967 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3968 truthvalue_conversion (TREE_OPERAND (expr, 2))));
3971 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
3972 since that affects how `default_conversion' will behave. */
3973 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
3974 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
3976 /* fall through... */
3978 /* If this is widening the argument, we can ignore it. */
3979 if (TYPE_PRECISION (TREE_TYPE (expr))
3980 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
3981 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3985 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
3987 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
3988 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
3990 /* fall through... */
3992 /* This and MINUS_EXPR can be changed into a comparison of the
3994 if (TREE_TYPE (TREE_OPERAND (expr, 0))
3995 == TREE_TYPE (TREE_OPERAND (expr, 1)))
3996 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3997 TREE_OPERAND (expr, 1), 1);
3998 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3999 fold (build1 (NOP_EXPR,
4000 TREE_TYPE (TREE_OPERAND (expr, 0)),
4001 TREE_OPERAND (expr, 1))), 1);
4004 if (integer_onep (TREE_OPERAND (expr, 1))
4005 && TREE_TYPE (expr) != boolean_type_node)
4006 /* Using convert here would cause infinite recursion. */
4007 return build1 (NOP_EXPR, boolean_type_node, expr);
4011 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
4012 warning ("suggest parentheses around assignment used as truth value");
4019 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
4021 tree tem = save_expr (expr);
4022 return (build_binary_op
4023 ((TREE_SIDE_EFFECTS (expr)
4024 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
4025 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
4026 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
4030 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
4034 /* Read the rest of a #-directive from input stream FINPUT.
4035 In normal use, the directive name and the white space after it
4036 have already been read, so they won't be included in the result.
4037 We allow for the fact that the directive line may contain
4038 a newline embedded within a character or string literal which forms
4039 a part of the directive.
4041 The value is a string in a reusable buffer. It remains valid
4042 only until the next time this function is called.
4044 The terminating character ('\n' or EOF) is left in FINPUT for the
4045 caller to re-read. */
4048 get_directive_line (finput)
4049 register FILE *finput;
4051 static char *directive_buffer = NULL;
4052 static unsigned buffer_length = 0;
4054 register char *buffer_limit;
4055 register int looking_for = 0;
4056 register int char_escaped = 0;
4058 if (buffer_length == 0)
4060 directive_buffer = (char *)xmalloc (128);
4061 buffer_length = 128;
4064 buffer_limit = &directive_buffer[buffer_length];
4066 for (p = directive_buffer; ; )
4070 /* Make buffer bigger if it is full. */
4071 if (p >= buffer_limit)
4073 register unsigned bytes_used = (p - directive_buffer);
4077 = (char *)xrealloc (directive_buffer, buffer_length);
4078 p = &directive_buffer[bytes_used];
4079 buffer_limit = &directive_buffer[buffer_length];
4084 /* Discard initial whitespace. */
4085 if ((c == ' ' || c == '\t') && p == directive_buffer)
4088 /* Detect the end of the directive. */
4089 if (looking_for == 0
4090 && (c == '\n' || c == EOF))
4099 return directive_buffer;
4101 /* Handle string and character constant syntax. */
4104 if (looking_for == c && !char_escaped)
4105 looking_for = 0; /* Found terminator... stop looking. */
4108 if (c == '\'' || c == '"')
4109 looking_for = c; /* Don't stop buffering until we see another
4110 one of these (or an EOF). */
4112 /* Handle backslash. */
4113 char_escaped = (c == '\\' && ! char_escaped);
4116 #endif /* USE_CPPLIB */
4118 /* Make a variant type in the proper way for C/C++, propagating qualifiers
4119 down to the element type of an array. */
4122 c_build_qualified_type (type, type_quals)
4126 /* A restrict-qualified pointer type must be a pointer to object or
4127 incomplete type. Note that the use of POINTER_TYPE_P also allows
4128 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
4129 the C++ front-end also use POINTER_TYPE for pointer-to-member
4130 values, so even though it should be illegal to use `restrict'
4131 with such an entity we don't flag that here. Thus, special case
4132 code for that case is required in the C++ front-end. */
4133 if ((type_quals & TYPE_QUAL_RESTRICT)
4134 && (!POINTER_TYPE_P (type)
4135 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
4137 error ("invalid use of `restrict'");
4138 type_quals &= ~TYPE_QUAL_RESTRICT;
4141 if (TREE_CODE (type) == ARRAY_TYPE)
4142 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
4144 TYPE_DOMAIN (type));
4145 return build_qualified_type (type, type_quals);
4148 /* Apply the TYPE_QUALS to the new DECL. */
4151 c_apply_type_quals_to_decl (type_quals, decl)
4155 if ((type_quals & TYPE_QUAL_CONST)
4156 || (TREE_TYPE (decl)
4157 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
4158 TREE_READONLY (decl) = 1;
4159 if (type_quals & TYPE_QUAL_VOLATILE)
4161 TREE_SIDE_EFFECTS (decl) = 1;
4162 TREE_THIS_VOLATILE (decl) = 1;
4164 if (type_quals & TYPE_QUAL_RESTRICT)
4166 if (!TREE_TYPE (decl)
4167 || !POINTER_TYPE_P (TREE_TYPE (decl))
4168 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
4169 error ("invalid use of `restrict'");
4170 else if (flag_strict_aliasing)
4172 /* No two restricted pointers can point at the same thing.
4173 However, a restricted pointer can point at the same thing
4174 as an unrestricted pointer, if that unrestricted pointer
4175 is based on the restricted pointer. So, we make the
4176 alias set for the restricted pointer a subset of the
4177 alias set for the type pointed to by the type of the
4180 HOST_WIDE_INT pointed_to_alias_set
4181 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
4183 if (pointed_to_alias_set == 0)
4184 /* It's not legal to make a subset of alias set zero. */
4188 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
4189 record_alias_subset (pointed_to_alias_set,
4190 DECL_POINTER_ALIAS_SET (decl));
4197 /* Return the typed-based alias set for T, which may be an expression
4198 or a type. Return -1 if we don't do anything special. */
4201 lang_get_alias_set (t)
4206 /* Permit type-punning when accessing a union, provided the access
4207 is directly through the union. For example, this code does not
4208 permit taking the address of a union member and then storing
4209 through it. Even the type-punning allowed here is a GCC
4210 extension, albeit a common and useful one; the C standard says
4211 that such accesses have implementation-defined behavior. */
4213 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
4214 u = TREE_OPERAND (u, 0))
4215 if (TREE_CODE (u) == COMPONENT_REF
4216 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
4219 /* If this is a char *, the ANSI C standard says it can alias
4220 anything. Note that all references need do this. */
4221 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
4222 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
4223 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
4226 /* That's all the expressions we handle specially. */
4230 /* The C standard specifically allows aliasing between signed and
4231 unsigned variants of the same type. We treat the signed
4232 variant as canonical. */
4233 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
4235 tree t1 = signed_type (t);
4237 /* t1 == t can happen for boolean nodes which are always unsigned. */
4239 return get_alias_set (t1);
4241 else if (POINTER_TYPE_P (t))
4245 /* Unfortunately, there is no canonical form of a pointer type.
4246 In particular, if we have `typedef int I', then `int *', and
4247 `I *' are different types. So, we have to pick a canonical
4248 representative. We do this below.
4250 Technically, this approach is actually more conservative that
4251 it needs to be. In particular, `const int *' and `int *'
4252 chould be in different alias sets, according to the C and C++
4253 standard, since their types are not the same, and so,
4254 technically, an `int **' and `const int **' cannot point at
4257 But, the standard is wrong. In particular, this code is
4262 const int* const* cipp = &ip;
4264 And, it doesn't make sense for that to be legal unless you
4265 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
4266 the pointed-to types. This issue has been reported to the
4268 t1 = TYPE_MAIN_VARIANT (TREE_TYPE (t));
4269 t1 = ((TREE_CODE (t) == POINTER_TYPE)
4270 ? build_pointer_type (t1) : build_reference_type (t1));
4272 return get_alias_set (t1);
4274 /* It's not yet safe to use alias sets for classes in C++ because
4275 the TYPE_FIELDs list for a class doesn't mention base classes. */
4276 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
4282 /* Build tree nodes and builtin functions common to both C and C++ language
4284 CPLUS_MODE is nonzero if we are called from the C++ frontend, we generate
4285 some stricter prototypes in that case.
4286 NO_BUILTINS and NO_NONANSI_BUILTINS contain the respective values of
4287 the language frontend flags flag_no_builtin and
4288 flag_no_nonansi_builtin. */
4291 c_common_nodes_and_builtins (cplus_mode, no_builtins, no_nonansi_builtins)
4292 int cplus_mode, no_builtins, no_nonansi_builtins;
4295 tree memcpy_ftype, memset_ftype, strlen_ftype;
4296 tree bzero_ftype, bcmp_ftype, puts_ftype, printf_ftype;
4297 tree endlink, int_endlink, double_endlink, unsigned_endlink;
4298 tree sizetype_endlink;
4299 tree ptr_ftype, ptr_ftype_unsigned;
4300 tree void_ftype_any, void_ftype_int, int_ftype_any, sizet_ftype_any;
4301 tree double_ftype_double, double_ftype_double_double;
4302 tree float_ftype_float, ldouble_ftype_ldouble;
4303 tree int_ftype_cptr_cptr_sizet;
4304 tree int_ftype_string_string, string_ftype_ptr_ptr;
4305 tree long_ftype_long;
4306 tree longlong_ftype_longlong;
4307 /* Either char* or void*. */
4308 tree traditional_ptr_type_node;
4309 /* Either const char* or const void*. */
4310 tree traditional_cptr_type_node;
4311 tree traditional_len_type_node;
4312 tree traditional_len_endlink;
4313 tree va_list_ref_type_node;
4314 tree va_list_arg_type_node;
4316 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
4317 va_list_type_node));
4319 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
4320 ptrdiff_type_node));
4322 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
4325 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4327 va_list_arg_type_node = va_list_ref_type_node =
4328 build_pointer_type (TREE_TYPE (va_list_type_node));
4332 va_list_arg_type_node = va_list_type_node;
4333 va_list_ref_type_node = build_reference_type (va_list_type_node);
4336 endlink = void_list_node;
4337 int_endlink = tree_cons (NULL_TREE, integer_type_node, endlink);
4338 double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
4339 unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
4341 ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
4342 ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
4343 sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
4344 /* We realloc here because sizetype could be int or unsigned. S'ok. */
4345 ptr_ftype_sizetype = build_function_type (ptr_type_node, sizetype_endlink);
4347 sizet_ftype_any = build_function_type (sizetype, NULL_TREE);
4348 int_ftype_any = build_function_type (integer_type_node, NULL_TREE);
4349 void_ftype_any = build_function_type (void_type_node, NULL_TREE);
4350 void_ftype = build_function_type (void_type_node, endlink);
4351 void_ftype_int = build_function_type (void_type_node, int_endlink);
4353 = build_function_type (void_type_node,
4354 tree_cons (NULL_TREE, ptr_type_node, endlink));
4357 = build_function_type (float_type_node,
4358 tree_cons (NULL_TREE, float_type_node, endlink));
4361 = build_function_type (double_type_node, double_endlink);
4363 ldouble_ftype_ldouble
4364 = build_function_type (long_double_type_node,
4365 tree_cons (NULL_TREE, long_double_type_node,
4368 double_ftype_double_double
4369 = build_function_type (double_type_node,
4370 tree_cons (NULL_TREE, double_type_node,
4374 = build_function_type (integer_type_node, int_endlink);
4377 = build_function_type (long_integer_type_node,
4378 tree_cons (NULL_TREE, long_integer_type_node,
4381 longlong_ftype_longlong
4382 = build_function_type (long_long_integer_type_node,
4383 tree_cons (NULL_TREE, long_long_integer_type_node,
4386 int_ftype_cptr_cptr_sizet
4387 = build_function_type (integer_type_node,
4388 tree_cons (NULL_TREE, const_ptr_type_node,
4389 tree_cons (NULL_TREE, const_ptr_type_node,
4390 tree_cons (NULL_TREE,
4394 void_zero_node = build_int_2 (0, 0);
4395 TREE_TYPE (void_zero_node) = void_type_node;
4397 /* Prototype for strcpy. */
4398 string_ftype_ptr_ptr
4399 = build_function_type (string_type_node,
4400 tree_cons (NULL_TREE, string_type_node,
4401 tree_cons (NULL_TREE,
4402 const_string_type_node,
4405 traditional_len_type_node = (flag_traditional && ! cplus_mode
4406 ? integer_type_node : sizetype);
4407 traditional_len_endlink = tree_cons (NULL_TREE, traditional_len_type_node,
4410 /* Prototype for strcmp. */
4411 int_ftype_string_string
4412 = build_function_type (integer_type_node,
4413 tree_cons (NULL_TREE, const_string_type_node,
4414 tree_cons (NULL_TREE,
4415 const_string_type_node,
4418 /* Prototype for strlen. */
4420 = build_function_type (traditional_len_type_node,
4421 tree_cons (NULL_TREE, const_string_type_node,
4424 traditional_ptr_type_node = (flag_traditional && ! cplus_mode
4425 ? string_type_node : ptr_type_node);
4426 traditional_cptr_type_node = (flag_traditional && ! cplus_mode
4427 ? const_string_type_node : const_ptr_type_node);
4429 /* Prototype for memcpy. */
4431 = build_function_type (traditional_ptr_type_node,
4432 tree_cons (NULL_TREE, ptr_type_node,
4433 tree_cons (NULL_TREE, const_ptr_type_node,
4434 sizetype_endlink)));
4436 /* Prototype for memset. */
4438 = build_function_type (traditional_ptr_type_node,
4439 tree_cons (NULL_TREE, ptr_type_node,
4440 tree_cons (NULL_TREE, integer_type_node,
4441 tree_cons (NULL_TREE,
4445 /* Prototype for bzero. */
4447 = build_function_type (void_type_node,
4448 tree_cons (NULL_TREE, traditional_ptr_type_node,
4449 traditional_len_endlink));
4451 /* Prototype for bcmp. */
4453 = build_function_type (integer_type_node,
4454 tree_cons (NULL_TREE, traditional_cptr_type_node,
4455 tree_cons (NULL_TREE,
4456 traditional_cptr_type_node,
4457 traditional_len_endlink)));
4459 /* Prototype for puts. */
4461 = build_function_type (integer_type_node,
4462 tree_cons (NULL_TREE, const_string_type_node,
4465 /* Prototype for printf. */
4467 = build_function_type (integer_type_node,
4468 tree_cons (NULL_TREE, const_string_type_node,
4471 builtin_function ("__builtin_constant_p", default_function_type,
4472 BUILT_IN_CONSTANT_P, BUILT_IN_NORMAL, NULL_PTR);
4474 builtin_function ("__builtin_return_address", ptr_ftype_unsigned,
4475 BUILT_IN_RETURN_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4477 builtin_function ("__builtin_frame_address", ptr_ftype_unsigned,
4478 BUILT_IN_FRAME_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4480 builtin_function ("__builtin_alloca", ptr_ftype_sizetype,
4481 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, "alloca");
4482 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS,
4483 BUILT_IN_NORMAL, NULL_PTR);
4484 /* Define alloca, ffs as builtins.
4485 Declare _exit just to mark it as volatile. */
4486 if (! no_builtins && ! no_nonansi_builtins)
4489 temp = builtin_function ("alloca", ptr_ftype_sizetype,
4490 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
4491 /* Suppress error if redefined as a non-function. */
4492 DECL_BUILT_IN_NONANSI (temp) = 1;
4494 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
4495 BUILT_IN_NORMAL, NULL_PTR);
4496 /* Suppress error if redefined as a non-function. */
4497 DECL_BUILT_IN_NONANSI (temp) = 1;
4498 temp = builtin_function ("_exit", void_ftype_int,
4499 0, NOT_BUILT_IN, NULL_PTR);
4500 TREE_THIS_VOLATILE (temp) = 1;
4501 TREE_SIDE_EFFECTS (temp) = 1;
4502 /* Suppress error if redefined as a non-function. */
4503 DECL_BUILT_IN_NONANSI (temp) = 1;
4505 /* The system prototypes for these functions have many
4506 variations, so don't specify parameters to avoid conflicts.
4507 The expand_* functions check the argument types anyway. */
4508 temp = builtin_function ("bzero", void_ftype_any,
4509 BUILT_IN_BZERO, BUILT_IN_NORMAL, NULL_PTR);
4510 DECL_BUILT_IN_NONANSI (temp) = 1;
4511 temp = builtin_function ("bcmp", int_ftype_any,
4512 BUILT_IN_BCMP, BUILT_IN_NORMAL, NULL_PTR);
4513 DECL_BUILT_IN_NONANSI (temp) = 1;
4516 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS,
4517 BUILT_IN_NORMAL, NULL_PTR);
4518 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
4519 BUILT_IN_NORMAL, NULL_PTR);
4520 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
4521 BUILT_IN_NORMAL, NULL_PTR);
4522 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4523 BUILT_IN_NORMAL, NULL_PTR);
4524 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
4525 BUILT_IN_NORMAL, NULL_PTR);
4526 builtin_function ("__builtin_llabs", longlong_ftype_longlong, BUILT_IN_LLABS,
4527 BUILT_IN_NORMAL, NULL_PTR);
4528 builtin_function ("__builtin_saveregs", ptr_ftype, BUILT_IN_SAVEREGS,
4529 BUILT_IN_NORMAL, NULL_PTR);
4530 builtin_function ("__builtin_classify_type", default_function_type,
4531 BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
4532 builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
4533 BUILT_IN_NORMAL, NULL_PTR);
4534 builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
4535 BUILT_IN_NORMAL, NULL_PTR);
4536 builtin_function ("__builtin_setjmp",
4537 build_function_type (integer_type_node,
4538 tree_cons (NULL_TREE, ptr_type_node,
4540 BUILT_IN_SETJMP, BUILT_IN_NORMAL, NULL_PTR);
4541 builtin_function ("__builtin_longjmp",
4542 build_function_type (void_type_node,
4543 tree_cons (NULL_TREE, ptr_type_node,
4544 tree_cons (NULL_TREE,
4547 BUILT_IN_LONGJMP, BUILT_IN_NORMAL, NULL_PTR);
4548 builtin_function ("__builtin_trap", void_ftype, BUILT_IN_TRAP,
4549 BUILT_IN_NORMAL, NULL_PTR);
4551 /* ISO C99 IEEE Unordered compares. */
4552 builtin_function ("__builtin_isgreater", default_function_type,
4553 BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
4554 builtin_function ("__builtin_isgreaterequal", default_function_type,
4555 BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
4556 builtin_function ("__builtin_isless", default_function_type,
4557 BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
4558 builtin_function ("__builtin_islessequal", default_function_type,
4559 BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
4560 builtin_function ("__builtin_islessgreater", default_function_type,
4561 BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
4562 builtin_function ("__builtin_isunordered", default_function_type,
4563 BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
4565 /* Untyped call and return. */
4566 builtin_function ("__builtin_apply_args", ptr_ftype,
4567 BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
4569 temp = tree_cons (NULL_TREE,
4570 build_pointer_type (build_function_type (void_type_node,
4572 tree_cons (NULL_TREE,
4574 tree_cons (NULL_TREE,
4577 builtin_function ("__builtin_apply",
4578 build_function_type (ptr_type_node, temp),
4579 BUILT_IN_APPLY, BUILT_IN_NORMAL, NULL_PTR);
4580 builtin_function ("__builtin_return", void_ftype_ptr,
4581 BUILT_IN_RETURN, BUILT_IN_NORMAL, NULL_PTR);
4583 /* Support for varargs.h and stdarg.h. */
4584 builtin_function ("__builtin_varargs_start",
4585 build_function_type (void_type_node,
4586 tree_cons (NULL_TREE,
4587 va_list_ref_type_node,
4589 BUILT_IN_VARARGS_START, BUILT_IN_NORMAL, NULL_PTR);
4591 builtin_function ("__builtin_stdarg_start",
4592 build_function_type (void_type_node,
4593 tree_cons (NULL_TREE,
4594 va_list_ref_type_node,
4596 BUILT_IN_STDARG_START, BUILT_IN_NORMAL, NULL_PTR);
4598 builtin_function ("__builtin_va_end",
4599 build_function_type (void_type_node,
4600 tree_cons (NULL_TREE,
4601 va_list_ref_type_node,
4603 BUILT_IN_VA_END, BUILT_IN_NORMAL, NULL_PTR);
4605 builtin_function ("__builtin_va_copy",
4606 build_function_type (void_type_node,
4607 tree_cons (NULL_TREE,
4608 va_list_ref_type_node,
4609 tree_cons (NULL_TREE,
4610 va_list_arg_type_node,
4612 BUILT_IN_VA_COPY, BUILT_IN_NORMAL, NULL_PTR);
4614 /* ??? Ought to be `T __builtin_expect(T, T)' for any type T. */
4615 builtin_function ("__builtin_expect",
4616 build_function_type (long_integer_type_node,
4617 tree_cons (NULL_TREE,
4618 long_integer_type_node,
4619 tree_cons (NULL_TREE,
4620 long_integer_type_node,
4622 BUILT_IN_EXPECT, BUILT_IN_NORMAL, NULL_PTR);
4624 /* Currently under experimentation. */
4625 builtin_function ("__builtin_memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4626 BUILT_IN_NORMAL, "memcpy");
4627 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
4628 BUILT_IN_MEMCMP, BUILT_IN_NORMAL, "memcmp");
4629 builtin_function ("__builtin_memset", memset_ftype,
4630 BUILT_IN_MEMSET, BUILT_IN_NORMAL, "memset");
4631 builtin_function ("__builtin_bzero", bzero_ftype,
4632 BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
4633 builtin_function ("__builtin_bcmp", bcmp_ftype,
4634 BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");
4635 builtin_function ("__builtin_strcmp", int_ftype_string_string,
4636 BUILT_IN_STRCMP, BUILT_IN_NORMAL, "strcmp");
4637 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
4638 BUILT_IN_STRCPY, BUILT_IN_NORMAL, "strcpy");
4639 builtin_function ("__builtin_strlen", strlen_ftype,
4640 BUILT_IN_STRLEN, BUILT_IN_NORMAL, "strlen");
4641 builtin_function ("__builtin_sqrtf", float_ftype_float,
4642 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtf");
4643 builtin_function ("__builtin_fsqrt", double_ftype_double,
4644 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrt");
4645 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
4646 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtl");
4647 builtin_function ("__builtin_sinf", float_ftype_float,
4648 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinf");
4649 builtin_function ("__builtin_sin", double_ftype_double,
4650 BUILT_IN_SIN, BUILT_IN_NORMAL, "sin");
4651 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
4652 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinl");
4653 builtin_function ("__builtin_cosf", float_ftype_float,
4654 BUILT_IN_COS, BUILT_IN_NORMAL, "cosf");
4655 builtin_function ("__builtin_cos", double_ftype_double,
4656 BUILT_IN_COS, BUILT_IN_NORMAL, "cos");
4657 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
4658 BUILT_IN_COS, BUILT_IN_NORMAL, "cosl");
4659 built_in_decls[BUILT_IN_PUTCHAR] =
4660 builtin_function ("__builtin_putchar", int_ftype_int,
4661 BUILT_IN_PUTCHAR, BUILT_IN_NORMAL, "putchar");
4662 built_in_decls[BUILT_IN_PUTS] =
4663 builtin_function ("__builtin_puts", puts_ftype,
4664 BUILT_IN_PUTS, BUILT_IN_NORMAL, "puts");
4665 builtin_function ("__builtin_printf", printf_ftype,
4666 BUILT_IN_PRINTF, BUILT_IN_FRONTEND, "printf");
4667 /* We declare these without argument so that the initial declaration
4668 for these identifiers is a builtin. That allows us to redeclare
4669 them later with argument without worrying about the explicit
4670 declarations in stdio.h being taken as the initial declaration.
4671 Also, save the _DECL for these so we can use them later. */
4672 built_in_decls[BUILT_IN_FWRITE] =
4673 builtin_function ("__builtin_fwrite", sizet_ftype_any,
4674 BUILT_IN_FWRITE, BUILT_IN_NORMAL, "fwrite");
4675 built_in_decls[BUILT_IN_FPUTC] =
4676 builtin_function ("__builtin_fputc", int_ftype_any,
4677 BUILT_IN_FPUTC, BUILT_IN_NORMAL, "fputc");
4678 built_in_decls[BUILT_IN_FPUTS] =
4679 builtin_function ("__builtin_fputs", int_ftype_any,
4680 BUILT_IN_FPUTS, BUILT_IN_NORMAL, "fputs");
4684 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS,
4685 BUILT_IN_NORMAL, NULL_PTR);
4686 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS,
4687 BUILT_IN_NORMAL, NULL_PTR);
4688 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS,
4689 BUILT_IN_NORMAL, NULL_PTR);
4690 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4691 BUILT_IN_NORMAL, NULL_PTR);
4692 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS,
4693 BUILT_IN_NORMAL, NULL_PTR);
4694 if (flag_isoc99 || ! no_nonansi_builtins)
4695 builtin_function ("llabs", longlong_ftype_longlong, BUILT_IN_LLABS,
4696 BUILT_IN_NORMAL, NULL_PTR);
4697 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4698 BUILT_IN_NORMAL, NULL_PTR);
4699 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
4700 BUILT_IN_NORMAL, NULL_PTR);
4701 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET,
4702 BUILT_IN_NORMAL, NULL_PTR);
4703 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
4704 BUILT_IN_NORMAL, NULL_PTR);
4705 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
4706 BUILT_IN_NORMAL, NULL_PTR);
4707 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN,
4708 BUILT_IN_NORMAL, NULL_PTR);
4709 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT,
4710 BUILT_IN_NORMAL, NULL_PTR);
4711 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT,
4712 BUILT_IN_NORMAL, NULL_PTR);
4713 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
4714 BUILT_IN_NORMAL, NULL_PTR);
4715 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN,
4716 BUILT_IN_NORMAL, NULL_PTR);
4717 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN,
4718 BUILT_IN_NORMAL, NULL_PTR);
4719 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN,
4720 BUILT_IN_NORMAL, NULL_PTR);
4721 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS,
4722 BUILT_IN_NORMAL, NULL_PTR);
4723 builtin_function ("cos", double_ftype_double, BUILT_IN_COS,
4724 BUILT_IN_NORMAL, NULL_PTR);
4725 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS,
4726 BUILT_IN_NORMAL, NULL_PTR);
4727 builtin_function ("printf", printf_ftype, BUILT_IN_PRINTF,
4728 BUILT_IN_FRONTEND, NULL_PTR);
4729 /* We declare these without argument so that the initial
4730 declaration for these identifiers is a builtin. That allows
4731 us to redeclare them later with argument without worrying
4732 about the explicit declarations in stdio.h being taken as the
4733 initial declaration. */
4734 builtin_function ("fputc", int_ftype_any, BUILT_IN_FPUTC,
4735 BUILT_IN_NORMAL, NULL_PTR);
4736 builtin_function ("fputs", int_ftype_any, BUILT_IN_FPUTS,
4737 BUILT_IN_NORMAL, NULL_PTR);
4739 /* Declare these functions volatile
4740 to avoid spurious "control drops through" warnings. */
4741 temp = builtin_function ("abort", cplus_mode ? void_ftype : void_ftype_any,
4742 0, NOT_BUILT_IN, NULL_PTR);
4743 TREE_THIS_VOLATILE (temp) = 1;
4744 TREE_SIDE_EFFECTS (temp) = 1;
4746 #if 0 /* ??? The C++ frontend used to do this. */
4747 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4749 DECL_BUILT_IN_NONANSI (temp) = 1;
4751 temp = builtin_function ("exit",
4752 cplus_mode ? void_ftype_int : void_ftype_any,
4753 0, NOT_BUILT_IN, NULL_PTR);
4754 TREE_THIS_VOLATILE (temp) = 1;
4755 TREE_SIDE_EFFECTS (temp) = 1;
4757 #if 0 /* ??? The C++ frontend used to do this. */
4758 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4760 DECL_BUILT_IN_NONANSI (temp) = 1;
4765 /* Support for these has not been written in either expand_builtin
4766 or build_function_call. */
4767 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV,
4768 BUILT_IN_NORMAL, NULL_PTR);
4769 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV,
4770 BUILT_IN_NORMAL, NULL_PTR);
4771 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
4772 BUILT_IN_NORMAL, NULL_PTR);
4773 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
4774 BUILT_IN_NORMAL, NULL_PTR);
4775 builtin_function ("__builtin_fmod", double_ftype_double_double,
4776 BUILT_IN_FMOD, BUILT_IN_NORMAL, NULL_PTR);
4777 builtin_function ("__builtin_frem", double_ftype_double_double,
4778 BUILT_IN_FREM, BUILT_IN_NORMAL, NULL_PTR);
4779 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
4780 BUILT_IN_NORMAL, NULL_PTR);
4781 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
4782 BUILT_IN_NORMAL, NULL_PTR);
4785 main_identifier_node = get_identifier ("main");
4787 /* ??? Perhaps there's a better place to do this. But it is related
4788 to __builtin_va_arg, so it isn't that off-the-wall. */
4789 lang_type_promotes_to = simple_type_promotes_to;
4793 build_va_arg (expr, type)
4796 return build1 (VA_ARG_EXPR, type, expr);
4799 /* Given a type, apply default promotions wrt unnamed function arguments
4800 and return the new type. Return NULL_TREE if no change. */
4801 /* ??? There is a function of the same name in the C++ front end that
4802 does something similar, but is more thorough and does not return NULL
4803 if no change. We could perhaps share code, but it would make the
4804 self_promoting_type property harder to identify. */
4807 simple_type_promotes_to (type)
4810 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4811 return double_type_node;
4813 if (C_PROMOTING_INTEGER_TYPE_P (type))
4815 /* Traditionally, unsignedness is preserved in default promotions.
4816 Also preserve unsignedness if not really getting any wider. */
4817 if (TREE_UNSIGNED (type)
4818 && (flag_traditional
4819 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
4820 return unsigned_type_node;
4821 return integer_type_node;
4827 /* Return 1 if PARMS specifies a fixed number of parameters
4828 and none of their types is affected by default promotions. */
4831 self_promoting_args_p (parms)
4835 for (t = parms; t; t = TREE_CHAIN (t))
4837 register tree type = TREE_VALUE (t);
4839 if (TREE_CHAIN (t) == 0 && type != void_type_node)
4845 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4848 if (C_PROMOTING_INTEGER_TYPE_P (type))
4854 /* Recognize certain built-in functions so we can make tree-codes
4855 other than CALL_EXPR. We do this when it enables fold-const.c
4856 to do something useful. */
4857 /* ??? By rights this should go in builtins.c, but only C and C++
4858 implement build_{binary,unary}_op. Not exactly sure what bits
4859 of functionality are actually needed from those functions, or
4860 where the similar functionality exists in the other front ends. */
4863 expand_tree_builtin (function, params, coerced_params)
4864 tree function, params, coerced_params;
4866 enum tree_code code;
4868 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
4871 switch (DECL_FUNCTION_CODE (function))
4875 case BUILT_IN_LLABS:
4877 if (coerced_params == 0)
4878 return integer_zero_node;
4879 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
4881 case BUILT_IN_ISGREATER:
4882 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4888 case BUILT_IN_ISGREATEREQUAL:
4889 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4895 case BUILT_IN_ISLESS:
4896 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4902 case BUILT_IN_ISLESSEQUAL:
4903 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4909 case BUILT_IN_ISLESSGREATER:
4910 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4916 case BUILT_IN_ISUNORDERED:
4917 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
4918 return integer_zero_node;
4919 code = UNORDERED_EXPR;
4927 || TREE_CHAIN (params) == 0)
4929 error ("too few arguments to function `%s'",
4930 IDENTIFIER_POINTER (DECL_NAME (function)));
4931 return error_mark_node;
4933 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
4935 error ("too many arguments to function `%s'",
4936 IDENTIFIER_POINTER (DECL_NAME (function)));
4937 return error_mark_node;
4940 arg0 = TREE_VALUE (params);
4941 arg1 = TREE_VALUE (TREE_CHAIN (params));
4942 arg0 = build_binary_op (code, arg0, arg1, 0);
4943 if (code != UNORDERED_EXPR)
4944 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
4956 /* Returns non-zero if CODE is the code for a statement. */
4959 statement_code_p (code)
4960 enum tree_code code;
4983 if (lang_statement_code_p)
4984 return (*lang_statement_code_p) (code);
4989 /* Walk the statemen tree, rooted at *tp. Apply FUNC to all the
4990 sub-trees of *TP in a pre-order traversal. FUNC is called with the
4991 DATA and the address of each sub-tree. If FUNC returns a non-NULL
4992 value, the traversal is aborted, and the value returned by FUNC is
4993 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
4994 the node being visited are not walked.
4996 We don't need a without_duplicates variant of this one because the
4997 statement tree is a tree, not a graph. */
5000 walk_stmt_tree (tp, func, data)
5005 enum tree_code code;
5010 #define WALK_SUBTREE(NODE) \
5013 result = walk_stmt_tree (&(NODE), func, data); \
5019 /* Skip empty subtrees. */
5023 /* Skip subtrees below non-statement nodes. */
5024 if (!statement_code_p (TREE_CODE (*tp)))
5027 /* Call the function. */
5029 result = (*func) (tp, &walk_subtrees, data);
5031 /* If we found something, return it. */
5035 /* Even if we didn't, FUNC may have decided that there was nothing
5036 interesting below this point in the tree. */
5040 /* FUNC may have modified the tree, recheck that we're looking at a
5042 code = TREE_CODE (*tp);
5043 if (!statement_code_p (code))
5046 /* Walk over all the sub-trees of this operand. Statement nodes never
5047 contain RTL, and we needn't worry about TARGET_EXPRs. */
5048 len = TREE_CODE_LENGTH (code);
5050 /* Go through the subtrees. We need to do this in forward order so
5051 that the scope of a FOR_EXPR is handled properly. */
5052 for (i = 0; i < len; ++i)
5053 WALK_SUBTREE (TREE_OPERAND (*tp, i));
5055 /* Finally visit the chain. This can be tail-recursion optimized if
5056 we write it this way. */
5057 return walk_stmt_tree (&TREE_CHAIN (*tp), func, data);
5062 /* Used to compare case labels. K1 and K2 are actually tree nodes
5063 representing case labels, or NULL_TREE for a `default' label.
5064 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
5065 K2, and 0 if K1 and K2 are equal. */
5068 case_compare (k1, k2)
5072 /* Consider a NULL key (such as arises with a `default' label) to be
5073 smaller than anything else. */
5079 return tree_int_cst_compare ((tree) k1, (tree) k2);
5082 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
5083 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
5084 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
5085 case label was declared using the usual C/C++ syntax, rather than
5086 the GNU case range extension. CASES is a tree containing all the
5087 case ranges processed so far; COND is the condition for the
5088 switch-statement itself. Returns the CASE_LABEL created, or
5089 ERROR_MARK_NODE if no CASE_LABEL is created. */
5092 c_add_case_label (cases, cond, low_value, high_value)
5101 splay_tree_node node;
5103 /* Create the LABEL_DECL itself. */
5104 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
5105 DECL_CONTEXT (label) = current_function_decl;
5107 /* If there was an error processing the switch condition, bail now
5108 before we get more confused. */
5109 if (!cond || cond == error_mark_node)
5111 /* Add a label anyhow so that the back-end doesn't think that
5112 the beginning of the switch is unreachable. */
5114 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5115 return error_mark_node;
5118 if ((low_value && TREE_TYPE (low_value)
5119 && POINTER_TYPE_P (TREE_TYPE (low_value)))
5120 || (high_value && TREE_TYPE (high_value)
5121 && POINTER_TYPE_P (TREE_TYPE (high_value))))
5122 error ("pointers are not permitted as case values");
5124 /* Case ranges are a GNU extension. */
5125 if (high_value && pedantic)
5127 if (c_language == clk_cplusplus)
5128 pedwarn ("ISO C++ forbids range expressions in switch statements");
5130 pedwarn ("ISO C forbids range expressions in switch statements");
5133 type = TREE_TYPE (cond);
5136 low_value = check_case_value (low_value);
5137 low_value = convert_and_check (type, low_value);
5141 high_value = check_case_value (high_value);
5142 high_value = convert_and_check (type, high_value);
5145 /* If an error has occurred, bail out now. */
5146 if (low_value == error_mark_node || high_value == error_mark_node)
5149 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5150 return error_mark_node;
5153 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
5154 really a case range, even though it was written that way. Remove
5155 the HIGH_VALUE to simplify later processing. */
5156 if (tree_int_cst_equal (low_value, high_value))
5157 high_value = NULL_TREE;
5158 if (low_value && high_value
5159 && !tree_int_cst_lt (low_value, high_value))
5160 warning ("empty range specified");
5162 /* Look up the LOW_VALUE in the table of case labels we already
5164 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
5165 /* If there was not an exact match, check for overlapping ranges.
5166 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
5167 that's a `default' label and the only overlap is an exact match. */
5168 if (!node && (low_value || high_value))
5170 splay_tree_node low_bound;
5171 splay_tree_node high_bound;
5173 /* Even though there wasn't an exact match, there might be an
5174 overlap between this case range and another case range.
5175 Since we've (inductively) not allowed any overlapping case
5176 ranges, we simply need to find the greatest low case label
5177 that is smaller that LOW_VALUE, and the smallest low case
5178 label that is greater than LOW_VALUE. If there is an overlap
5179 it will occur in one of these two ranges. */
5180 low_bound = splay_tree_predecessor (cases,
5181 (splay_tree_key) low_value);
5182 high_bound = splay_tree_successor (cases,
5183 (splay_tree_key) low_value);
5185 /* Check to see if the LOW_BOUND overlaps. It is smaller than
5186 the LOW_VALUE, so there is no need to check unless the
5187 LOW_BOUND is in fact itself a case range. */
5189 && CASE_HIGH ((tree) low_bound->value)
5190 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
5193 /* Check to see if the HIGH_BOUND overlaps. The low end of that
5194 range is bigger than the low end of the current range, so we
5195 are only interested if the current range is a real range, and
5196 not an ordinary case label. */
5199 && (tree_int_cst_compare ((tree) high_bound->key,
5204 /* If there was an overlap, issue an error. */
5207 tree duplicate = CASE_LABEL_DECL ((tree) node->value);
5211 error ("duplicate (or overlapping) case value");
5212 error_with_decl (duplicate,
5213 "this is the first entry overlapping that value");
5217 error ("duplicate case value") ;
5218 error_with_decl (duplicate, "previously used here");
5222 error ("multiple default labels in one switch");
5223 error_with_decl (duplicate, "this is the first default label");
5226 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5229 /* Add a CASE_LABEL to the statement-tree. */
5230 case_label = add_stmt (build_case_label (low_value, high_value, label));
5231 /* Register this case label in the splay tree. */
5232 splay_tree_insert (cases,
5233 (splay_tree_key) low_value,
5234 (splay_tree_value) case_label);
5239 /* Mark P (a stmt_tree) for GC. The use of a `void *' for the
5240 parameter allows this function to be used as a GC-marking
5247 stmt_tree st = (stmt_tree) p;
5249 ggc_mark_tree (st->x_last_stmt);
5250 ggc_mark_tree (st->x_last_expr_type);
5253 /* Mark LD for GC. */
5256 c_mark_lang_decl (c)
5257 struct c_lang_decl *c;
5259 ggc_mark_tree (c->saved_tree);
5262 /* Mark F for GC. */
5265 mark_c_language_function (f)
5266 struct language_function *f;
5271 mark_stmt_tree (&f->x_stmt_tree);
5272 ggc_mark_tree (f->x_scope_stmt_stack);
5275 /* Hook used by expand_expr to expand language-specific tree codes. */
5278 c_expand_expr (exp, target, tmode, modifier)
5281 enum machine_mode tmode;
5282 enum expand_modifier modifier;
5284 switch (TREE_CODE (exp))
5291 /* Since expand_expr_stmt calls free_temp_slots after every
5292 expression statement, we must call push_temp_slots here.
5293 Otherwise, any temporaries in use now would be considered
5294 out-of-scope after the first EXPR_STMT from within the
5297 rtl_expr = expand_start_stmt_expr ();
5298 expand_stmt (STMT_EXPR_STMT (exp));
5299 expand_end_stmt_expr (rtl_expr);
5300 result = expand_expr (rtl_expr, target, tmode, modifier);
5308 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
5309 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5311 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5312 && (DECL_BUILT_IN_CLASS (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5313 == BUILT_IN_FRONTEND))
5314 return c_expand_builtin (exp, target, tmode, modifier);
5328 /* Hook used by safe_from_p to handle language-specific tree codes. */
5331 c_safe_from_p (target, exp)
5335 /* We can see statements here when processing the body of a
5336 statement-expression. For a declaration statement declaring a
5337 variable, look at the variable's initializer. */
5338 if (TREE_CODE (exp) == DECL_STMT)
5340 tree decl = DECL_STMT_DECL (exp);
5342 if (TREE_CODE (decl) == VAR_DECL
5343 && DECL_INITIAL (decl)
5344 && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0))
5348 /* For any statement, we must follow the statement-chain. */
5349 if (statement_code_p (TREE_CODE (exp)) && TREE_CHAIN (exp))
5350 return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0);
5352 /* Assume everything else is safe. */
5356 /* Tree code classes. */
5358 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
5360 static char c_tree_code_type[] = {
5362 #include "c-common.def"
5366 /* Table indexed by tree code giving number of expression
5367 operands beyond the fixed part of the node structure.
5368 Not used for types or decls. */
5370 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
5372 static int c_tree_code_length[] = {
5374 #include "c-common.def"
5378 /* Names of tree components.
5379 Used for printing out the tree and error messages. */
5380 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
5382 static const char *c_tree_code_name[] = {
5384 #include "c-common.def"
5388 /* Adds the tree codes specific to the C front end to the list of all
5394 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
5396 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
5397 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
5399 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
5400 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
5402 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));
5405 #define CALLED_AS_BUILT_IN(NODE) \
5406 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
5409 c_expand_builtin (exp, target, tmode, modifier)
5412 enum machine_mode tmode;
5413 enum expand_modifier modifier;
5415 tree type = TREE_TYPE (exp);
5416 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
5417 tree arglist = TREE_OPERAND (exp, 1);
5418 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
5419 enum tree_code code = TREE_CODE (exp);
5420 const int ignore = (target == const0_rtx
5421 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
5422 || code == CONVERT_EXPR || code == REFERENCE_EXPR
5423 || code == COND_EXPR)
5424 && TREE_CODE (type) == VOID_TYPE));
5426 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl))
5427 return expand_call (exp, target, ignore);
5431 case BUILT_IN_PRINTF:
5432 target = c_expand_builtin_printf (arglist, target, tmode,
5438 default: /* just do library call, if unknown builtin */
5439 error ("built-in function `%s' not currently supported",
5440 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
5443 /* The switch statement above can drop through to cause the function
5444 to be called normally. */
5445 return expand_call (exp, target, ignore);
5448 /* Check an arglist to *printf for problems. The arglist should start
5449 at the format specifier, with the remaining arguments immediately
5452 is_valid_printf_arglist (arglist)
5455 /* Save this value so we can restore it later. */
5456 const int SAVE_pedantic = pedantic;
5457 int diagnostic_occurred = 0;
5459 /* Set this to a known value so the user setting won't affect code
5462 /* Check to make sure there are no format specifier errors. */
5463 check_function_format (&diagnostic_occurred,
5464 maybe_get_identifier("printf"),
5465 NULL_TREE, arglist);
5467 /* Restore the value of `pedantic'. */
5468 pedantic = SAVE_pedantic;
5470 /* If calling `check_function_format_ptr' produces a warning, we
5471 return false, otherwise we return true. */
5472 return ! diagnostic_occurred;
5475 /* If the arguments passed to printf are suitable for optimizations,
5476 we attempt to transform the call. */
5478 c_expand_builtin_printf (arglist, target, tmode, modifier, ignore)
5481 enum machine_mode tmode;
5482 enum expand_modifier modifier;
5485 tree fn_putchar = built_in_decls[BUILT_IN_PUTCHAR],
5486 fn_puts = built_in_decls[BUILT_IN_PUTS];
5487 tree fn, format_arg, stripped_string;
5489 /* If the return value is used, or the replacement _DECL isn't
5490 initialized, don't do the transformation. */
5491 if (!ignore || !fn_putchar || !fn_puts)
5494 /* Verify the required arguments in the original call. */
5496 || (TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE))
5499 /* Check the specifier vs. the parameters. */
5500 if (!is_valid_printf_arglist (arglist))
5503 format_arg = TREE_VALUE (arglist);
5504 stripped_string = format_arg;
5505 STRIP_NOPS (stripped_string);
5506 if (stripped_string && TREE_CODE (stripped_string) == ADDR_EXPR)
5507 stripped_string = TREE_OPERAND (stripped_string, 0);
5509 /* If the format specifier isn't a STRING_CST, punt. */
5510 if (TREE_CODE (stripped_string) != STRING_CST)
5513 /* OK! We can attempt optimization. */
5515 /* If the format specifier was "%s\n", call __builtin_puts(arg2). */
5516 if (strcmp (TREE_STRING_POINTER (stripped_string), "%s\n") == 0)
5518 arglist = TREE_CHAIN (arglist);
5521 /* If the format specifier was "%c", call __builtin_putchar (arg2). */
5522 else if (strcmp (TREE_STRING_POINTER (stripped_string), "%c") == 0)
5524 arglist = TREE_CHAIN (arglist);
5529 /* We can't handle anything else with % args or %% ... yet. */
5530 if (strchr (TREE_STRING_POINTER (stripped_string), '%'))
5533 /* If the resulting constant string has a length of 1, call
5534 putchar. Note, TREE_STRING_LENGTH includes the terminating
5535 NULL in its count. */
5536 if (TREE_STRING_LENGTH (stripped_string) == 2)
5538 /* Given printf("c"), (where c is any one character,)
5539 convert "c"[0] to an int and pass that to the replacement
5541 arglist = build_int_2 (TREE_STRING_POINTER (stripped_string)[0], 0);
5542 arglist = build_tree_list (NULL_TREE, arglist);
5546 /* If the resulting constant was "string\n", call
5547 __builtin_puts("string"). Ensure "string" has at least one
5548 character besides the trailing \n. Note, TREE_STRING_LENGTH
5549 includes the terminating NULL in its count. */
5550 else if (TREE_STRING_LENGTH (stripped_string) > 2
5551 && TREE_STRING_POINTER (stripped_string)
5552 [TREE_STRING_LENGTH (stripped_string) - 2] == '\n')
5554 /* Create a NULL-terminated string that's one char shorter
5555 than the original, stripping off the trailing '\n'. */
5556 const int newlen = TREE_STRING_LENGTH (stripped_string) - 1;
5557 char *newstr = (char *) alloca (newlen);
5558 memcpy (newstr, TREE_STRING_POINTER (stripped_string), newlen - 1);
5559 newstr[newlen - 1] = 0;
5561 arglist = combine_strings (build_string (newlen, newstr));
5562 arglist = build_tree_list (NULL_TREE, arglist);
5566 /* We'd like to arrange to call fputs(string) here, but we
5567 need stdout and don't have a way to get it ... yet. */
5571 return expand_expr (build_function_call (fn, arglist),
5572 (ignore ? const0_rtx : target),