1 /* Subroutines shared by all languages that are variants of C.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
41 #undef WCHAR_TYPE_SIZE
42 #define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
44 /* The following symbols are subsumed in the c_global_trees array, and
45 listed here individually for documentation purposes.
47 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
49 tree short_integer_type_node;
50 tree long_integer_type_node;
51 tree long_long_integer_type_node;
53 tree short_unsigned_type_node;
54 tree long_unsigned_type_node;
55 tree long_long_unsigned_type_node;
57 tree boolean_type_node;
58 tree boolean_false_node;
59 tree boolean_true_node;
61 tree ptrdiff_type_node;
63 tree unsigned_char_type_node;
64 tree signed_char_type_node;
66 tree signed_wchar_type_node;
67 tree unsigned_wchar_type_node;
70 tree double_type_node;
71 tree long_double_type_node;
73 tree complex_integer_type_node;
74 tree complex_float_type_node;
75 tree complex_double_type_node;
76 tree complex_long_double_type_node;
84 tree unsigned_intQI_type_node;
85 tree unsigned_intHI_type_node;
86 tree unsigned_intSI_type_node;
87 tree unsigned_intDI_type_node;
88 tree unsigned_intTI_type_node;
90 tree widest_integer_literal_type_node;
91 tree widest_unsigned_literal_type_node;
93 Nodes for types `void *' and `const void *'.
95 tree ptr_type_node, const_ptr_type_node;
97 Nodes for types `char *' and `const char *'.
99 tree string_type_node, const_string_type_node;
101 Type `char[SOMENUMBER]'.
102 Used when an array of char is needed and the size is irrelevant.
104 tree char_array_type_node;
106 Type `int[SOMENUMBER]' or something like it.
107 Used when an array of int needed and the size is irrelevant.
109 tree int_array_type_node;
111 Type `wchar_t[SOMENUMBER]' or something like it.
112 Used when a wide string literal is created.
114 tree wchar_array_type_node;
116 Type `int ()' -- used for implicit declaration of functions.
118 tree default_function_type;
120 Function types `int (int)', etc.
126 tree ptr_ftype_sizetype;
128 A VOID_TYPE node, packaged in a TREE_LIST.
132 The identifiers __FUNCTION__, __PRETTY_FUNCTION__, and __func__.
134 tree function_id_node;
135 tree pretty_function_id_node;
140 tree c_global_trees[CTI_MAX];
142 /* The elements of `ridpointers' are identifier nodes for the reserved
143 type names and storage classes. It is indexed by a RID_... value. */
146 tree (*make_fname_decl) PARAMS ((tree, const char *, int));
148 /* If non-NULL, the address of a language-specific function that
149 returns 1 for language-specific statement codes. */
150 int (*lang_statement_code_p) PARAMS ((enum tree_code));
152 /* If non-NULL, the address of a language-specific function that takes
153 any action required right before expand_function_end is called. */
154 void (*lang_expand_function_end) PARAMS ((void));
156 /* Nonzero means the expression being parsed will never be evaluated.
157 This is a count, since unevaluated expressions can nest. */
160 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
161 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
162 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
163 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
164 A_NO_LIMIT_STACK, A_PURE};
166 enum format_type { printf_format_type, scanf_format_type,
167 strftime_format_type };
169 static void add_attribute PARAMS ((enum attrs, const char *,
171 static void init_attributes PARAMS ((void));
172 static void record_function_format PARAMS ((tree, tree, enum format_type,
174 static void record_international_format PARAMS ((tree, tree, int));
175 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
177 /* Keep a stack of if statements. We record the number of compound
178 statements seen up to the if keyword, as well as the line number
179 and file of the if. If a potentially ambiguous else is seen, that
180 fact is recorded; the warning is issued when we can be sure that
181 the enclosing if statement does not have an else branch. */
190 static void tfaff PARAMS ((void));
192 static if_elt *if_stack;
194 /* Amount of space in the if statement stack. */
195 static int if_stack_space = 0;
198 static int if_stack_pointer = 0;
200 /* Record the start of an if-then, and record the start of it
201 for ambiguous else detection. */
204 c_expand_start_cond (cond, compstmt_count)
210 /* Make sure there is enough space on the stack. */
211 if (if_stack_space == 0)
214 if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
216 else if (if_stack_space == if_stack_pointer)
218 if_stack_space += 10;
219 if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
222 if_stmt = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE);
223 IF_COND (if_stmt) = cond;
226 /* Record this if statement. */
227 if_stack[if_stack_pointer].compstmt_count = compstmt_count;
228 if_stack[if_stack_pointer].file = input_filename;
229 if_stack[if_stack_pointer].line = lineno;
230 if_stack[if_stack_pointer].needs_warning = 0;
231 if_stack[if_stack_pointer].if_stmt = if_stmt;
235 /* Called after the then-clause for an if-statement is processed. */
240 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
241 RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt));
244 /* Record the end of an if-then. Optionally warn if a nested
245 if statement had an ambiguous else clause. */
251 if (if_stack[if_stack_pointer].needs_warning)
252 warning_with_file_and_line (if_stack[if_stack_pointer].file,
253 if_stack[if_stack_pointer].line,
254 "suggest explicit braces to avoid ambiguous `else'");
255 last_expr_type = NULL_TREE;
258 /* Called between the then-clause and the else-clause
259 of an if-then-else. */
262 c_expand_start_else ()
264 /* An ambiguous else warning must be generated for the enclosing if
265 statement, unless we see an else branch for that one, too. */
267 && if_stack_pointer > 1
268 && (if_stack[if_stack_pointer - 1].compstmt_count
269 == if_stack[if_stack_pointer - 2].compstmt_count))
270 if_stack[if_stack_pointer - 2].needs_warning = 1;
272 /* Even if a nested if statement had an else branch, it can't be
273 ambiguous if this one also has an else. So don't warn in that
274 case. Also don't warn for any if statements nested in this else. */
275 if_stack[if_stack_pointer - 1].needs_warning = 0;
276 if_stack[if_stack_pointer - 1].compstmt_count--;
279 /* Called after the else-clause for an if-statement is processed. */
284 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
285 RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt));
288 /* Make bindings for __FUNCTION__, __PRETTY_FUNCTION__, and __func__. */
291 declare_function_name ()
293 const char *name, *printable_name;
295 if (current_function_decl == NULL)
298 printable_name = "top level";
302 /* Allow functions to be nameless (such as artificial ones). */
303 if (DECL_NAME (current_function_decl))
304 name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
307 printable_name = (*decl_printable_name) (current_function_decl, 2);
309 /* ISO C99 defines __func__, which is a variable, not a string
310 constant, and which is not a defined symbol at file scope. */
311 (*make_fname_decl) (func_id_node, name, 0);
314 (*make_fname_decl) (function_id_node, name, 0);
315 (*make_fname_decl) (pretty_function_id_node, printable_name, 1);
318 /* Given a chain of STRING_CST nodes,
319 concatenate them into one STRING_CST
320 and give it a suitable array-of-chars data type. */
323 combine_strings (strings)
326 register tree value, t;
327 register int length = 1;
330 int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
332 const int nchars_max = flag_isoc99 ? 4095 : 509;
334 if (TREE_CHAIN (strings))
336 /* More than one in the chain, so concatenate. */
337 register char *p, *q;
339 /* Don't include the \0 at the end of each substring,
340 except for the last one.
341 Count wide strings and ordinary strings separately. */
342 for (t = strings; t; t = TREE_CHAIN (t))
344 if (TREE_TYPE (t) == wchar_array_type_node)
346 wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
350 length += (TREE_STRING_LENGTH (t) - 1);
353 /* If anything is wide, the non-wides will be converted,
354 which makes them take more space. */
356 length = length * wchar_bytes + wide_length;
358 p = ggc_alloc_string (NULL, length);
360 /* Copy the individual strings into the new combined string.
361 If the combined string is wide, convert the chars to ints
362 for any individual strings that are not wide. */
365 for (t = strings; t; t = TREE_CHAIN (t))
367 int len = (TREE_STRING_LENGTH (t)
368 - ((TREE_TYPE (t) == wchar_array_type_node)
370 if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
372 memcpy (q, TREE_STRING_POINTER (t), len);
378 for (i = 0; i < len; i++)
380 if (WCHAR_TYPE_SIZE == HOST_BITS_PER_SHORT)
381 ((short *) q)[i] = TREE_STRING_POINTER (t)[i];
383 ((int *) q)[i] = TREE_STRING_POINTER (t)[i];
385 q += len * wchar_bytes;
391 for (i = 0; i < wchar_bytes; i++)
397 value = make_node (STRING_CST);
398 TREE_STRING_POINTER (value) = p;
399 TREE_STRING_LENGTH (value) = length;
404 length = TREE_STRING_LENGTH (value);
405 if (TREE_TYPE (value) == wchar_array_type_node)
409 /* Compute the number of elements, for the array type. */
410 nchars = wide_flag ? length / wchar_bytes : length;
412 if (pedantic && nchars > nchars_max)
413 pedwarn ("string length `%d' is greater than the minimum length `%d' ISO C%d is required to support",
414 nchars, nchars_max, flag_isoc99 ? 99 : 89);
416 /* Create the array type for the string constant.
417 -Wwrite-strings says make the string constant an array of const char
418 so that copying it to a non-const pointer will get a warning.
419 For C++, this is the standard behavior. */
420 if (flag_const_strings
421 && (! flag_traditional && ! flag_writable_strings))
424 = build_type_variant (wide_flag ? wchar_type_node : char_type_node,
427 = build_array_type (elements,
428 build_index_type (build_int_2 (nchars - 1, 0)));
432 = build_array_type (wide_flag ? wchar_type_node : char_type_node,
433 build_index_type (build_int_2 (nchars - 1, 0)));
435 TREE_CONSTANT (value) = 1;
436 TREE_READONLY (value) = ! flag_writable_strings;
437 TREE_STATIC (value) = 1;
441 /* To speed up processing of attributes, we maintain an array of
442 IDENTIFIER_NODES and the corresponding attribute types. */
444 /* Array to hold attribute information. */
446 static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
448 static int attrtab_idx = 0;
450 /* Add an entry to the attribute table above. */
453 add_attribute (id, string, min_len, max_len, decl_req)
456 int min_len, max_len;
461 attrtab[attrtab_idx].id = id;
462 attrtab[attrtab_idx].name = get_identifier (string);
463 attrtab[attrtab_idx].min = min_len;
464 attrtab[attrtab_idx].max = max_len;
465 attrtab[attrtab_idx++].decl_req = decl_req;
467 sprintf (buf, "__%s__", string);
469 attrtab[attrtab_idx].id = id;
470 attrtab[attrtab_idx].name = get_identifier (buf);
471 attrtab[attrtab_idx].min = min_len;
472 attrtab[attrtab_idx].max = max_len;
473 attrtab[attrtab_idx++].decl_req = decl_req;
476 /* Initialize attribute table. */
481 add_attribute (A_PACKED, "packed", 0, 0, 0);
482 add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
483 add_attribute (A_COMMON, "common", 0, 0, 1);
484 add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
485 add_attribute (A_NORETURN, "volatile", 0, 0, 1);
486 add_attribute (A_UNUSED, "unused", 0, 0, 0);
487 add_attribute (A_CONST, "const", 0, 0, 1);
488 add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
489 add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
490 add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
491 add_attribute (A_MODE, "mode", 1, 1, 1);
492 add_attribute (A_SECTION, "section", 1, 1, 1);
493 add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
494 add_attribute (A_FORMAT, "format", 3, 3, 1);
495 add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
496 add_attribute (A_WEAK, "weak", 0, 0, 1);
497 add_attribute (A_ALIAS, "alias", 1, 1, 1);
498 add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
499 add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
500 add_attribute (A_MALLOC, "malloc", 0, 0, 1);
501 add_attribute (A_NO_LIMIT_STACK, "no_stack_limit", 0, 0, 1);
502 add_attribute (A_PURE, "pure", 0, 0, 1);
505 /* Default implementation of valid_lang_attribute, below. By default, there
506 are no language-specific attributes. */
509 default_valid_lang_attribute (attr_name, attr_args, decl, type)
510 tree attr_name ATTRIBUTE_UNUSED;
511 tree attr_args ATTRIBUTE_UNUSED;
512 tree decl ATTRIBUTE_UNUSED;
513 tree type ATTRIBUTE_UNUSED;
518 /* Return a 1 if ATTR_NAME and ATTR_ARGS denote a valid language-specific
519 attribute for either declaration DECL or type TYPE and 0 otherwise. */
521 int (*valid_lang_attribute) PARAMS ((tree, tree, tree, tree))
522 = default_valid_lang_attribute;
524 /* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
525 and install them in NODE, which is either a DECL (including a TYPE_DECL)
526 or a TYPE. PREFIX_ATTRIBUTES can appear after the declaration specifiers
527 and declaration modifiers but before the declaration proper. */
530 decl_attributes (node, attributes, prefix_attributes)
531 tree node, attributes, prefix_attributes;
533 tree decl = 0, type = 0;
537 if (attrtab_idx == 0)
543 type = TREE_TYPE (decl);
544 is_type = TREE_CODE (node) == TYPE_DECL;
546 else if (TYPE_P (node))
547 type = node, is_type = 1;
549 #ifdef PRAGMA_INSERT_ATTRIBUTES
550 /* If the code in c-pragma.c wants to insert some attributes then
551 allow it to do so. Do this before allowing machine back ends to
552 insert attributes, so that they have the opportunity to override
553 anything done here. */
554 PRAGMA_INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
557 #ifdef INSERT_ATTRIBUTES
558 INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
561 attributes = chainon (prefix_attributes, attributes);
563 for (a = attributes; a; a = TREE_CHAIN (a))
565 tree name = TREE_PURPOSE (a);
566 tree args = TREE_VALUE (a);
570 for (i = 0; i < attrtab_idx; i++)
571 if (attrtab[i].name == name)
574 if (i == attrtab_idx)
576 if (! valid_machine_attribute (name, args, decl, type)
577 && ! (* valid_lang_attribute) (name, args, decl, type))
578 warning ("`%s' attribute directive ignored",
579 IDENTIFIER_POINTER (name));
581 type = TREE_TYPE (decl);
584 else if (attrtab[i].decl_req && decl == 0)
586 warning ("`%s' attribute does not apply to types",
587 IDENTIFIER_POINTER (name));
590 else if (list_length (args) < attrtab[i].min
591 || list_length (args) > attrtab[i].max)
593 error ("wrong number of arguments specified for `%s' attribute",
594 IDENTIFIER_POINTER (name));
603 TYPE_PACKED (type) = 1;
604 else if (TREE_CODE (decl) == FIELD_DECL)
605 DECL_PACKED (decl) = 1;
606 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
607 used for DECL_REGISTER. It wouldn't mean anything anyway. */
609 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
613 if (TREE_CODE (decl) == VAR_DECL)
614 DECL_COMMON (decl) = 0;
616 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
620 if (TREE_CODE (decl) == VAR_DECL)
621 DECL_COMMON (decl) = 1;
623 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
627 if (TREE_CODE (decl) == FUNCTION_DECL)
628 TREE_THIS_VOLATILE (decl) = 1;
629 else if (TREE_CODE (type) == POINTER_TYPE
630 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
631 TREE_TYPE (decl) = type
633 (build_type_variant (TREE_TYPE (type),
634 TREE_READONLY (TREE_TYPE (type)), 1));
636 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
640 if (TREE_CODE (decl) == FUNCTION_DECL)
641 DECL_IS_MALLOC (decl) = 1;
642 /* ??? TODO: Support types. */
644 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
650 TREE_USED (decl) = 1;
652 TREE_USED (type) = 1;
653 else if (TREE_CODE (decl) == PARM_DECL
654 || TREE_CODE (decl) == VAR_DECL
655 || TREE_CODE (decl) == FUNCTION_DECL
656 || TREE_CODE (decl) == LABEL_DECL)
657 TREE_USED (decl) = 1;
659 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
663 if (TREE_CODE (decl) == FUNCTION_DECL)
664 TREE_READONLY (decl) = 1;
665 else if (TREE_CODE (type) == POINTER_TYPE
666 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
667 TREE_TYPE (decl) = type
669 (build_type_variant (TREE_TYPE (type), 1,
670 TREE_THIS_VOLATILE (TREE_TYPE (type))));
672 warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
676 if (TREE_CODE (decl) == FUNCTION_DECL)
677 DECL_IS_PURE (decl) = 1;
678 /* ??? TODO: Support types. */
680 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
686 && TREE_CODE (type) == UNION_TYPE
688 || (TYPE_FIELDS (type) != 0
689 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
690 TYPE_TRANSPARENT_UNION (type) = 1;
691 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
692 && TREE_CODE (type) == UNION_TYPE
693 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
694 DECL_TRANSPARENT_UNION (decl) = 1;
696 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
700 if (TREE_CODE (decl) == FUNCTION_DECL
701 && TREE_CODE (type) == FUNCTION_TYPE
702 && decl_function_context (decl) == 0)
704 DECL_STATIC_CONSTRUCTOR (decl) = 1;
705 TREE_USED (decl) = 1;
708 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
712 if (TREE_CODE (decl) == FUNCTION_DECL
713 && TREE_CODE (type) == FUNCTION_TYPE
714 && decl_function_context (decl) == 0)
716 DECL_STATIC_DESTRUCTOR (decl) = 1;
717 TREE_USED (decl) = 1;
720 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
724 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
725 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
729 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
730 int len = strlen (p);
731 enum machine_mode mode = VOIDmode;
734 if (len > 4 && p[0] == '_' && p[1] == '_'
735 && p[len - 1] == '_' && p[len - 2] == '_')
737 char *newp = (char *) alloca (len - 1);
739 strcpy (newp, &p[2]);
740 newp[len - 4] = '\0';
744 /* Give this decl a type with the specified mode.
745 First check for the special modes. */
746 if (! strcmp (p, "byte"))
748 else if (!strcmp (p, "word"))
750 else if (! strcmp (p, "pointer"))
753 for (j = 0; j < NUM_MACHINE_MODES; j++)
754 if (!strcmp (p, GET_MODE_NAME (j)))
755 mode = (enum machine_mode) j;
757 if (mode == VOIDmode)
758 error ("unknown machine mode `%s'", p);
759 else if (0 == (typefm = type_for_mode (mode,
760 TREE_UNSIGNED (type))))
761 error ("no data type for mode `%s'", p);
764 TREE_TYPE (decl) = type = typefm;
765 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
766 layout_decl (decl, 0);
772 #ifdef ASM_OUTPUT_SECTION_NAME
773 if ((TREE_CODE (decl) == FUNCTION_DECL
774 || TREE_CODE (decl) == VAR_DECL)
775 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
777 if (TREE_CODE (decl) == VAR_DECL
778 && current_function_decl != NULL_TREE
779 && ! TREE_STATIC (decl))
780 error_with_decl (decl,
781 "section attribute cannot be specified for local variables");
782 /* The decl may have already been given a section attribute from
783 a previous declaration. Ensure they match. */
784 else if (DECL_SECTION_NAME (decl) != NULL_TREE
785 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
786 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
787 error_with_decl (node,
788 "section of `%s' conflicts with previous declaration");
790 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
793 error_with_decl (node,
794 "section attribute not allowed for `%s'");
796 error_with_decl (node,
797 "section attributes are not supported for this target");
804 = (args ? TREE_VALUE (args)
805 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
808 /* Strip any NOPs of any kind. */
809 while (TREE_CODE (align_expr) == NOP_EXPR
810 || TREE_CODE (align_expr) == CONVERT_EXPR
811 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
812 align_expr = TREE_OPERAND (align_expr, 0);
814 if (TREE_CODE (align_expr) != INTEGER_CST)
816 error ("requested alignment is not a constant");
820 if ((i = tree_log2 (align_expr)) == -1)
821 error ("requested alignment is not a power of 2");
822 else if (i > HOST_BITS_PER_INT - 2)
823 error ("requested alignment is too large");
826 /* If we have a TYPE_DECL, then copy the type, so that we
827 don't accidentally modify a builtin type. See pushdecl. */
828 if (decl && TREE_TYPE (decl) != error_mark_node
829 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
831 tree tt = TREE_TYPE (decl);
832 DECL_ORIGINAL_TYPE (decl) = tt;
833 tt = build_type_copy (tt);
834 TYPE_NAME (tt) = decl;
835 TREE_USED (tt) = TREE_USED (decl);
836 TREE_TYPE (decl) = tt;
840 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
841 TYPE_USER_ALIGN (type) = 1;
843 else if (TREE_CODE (decl) != VAR_DECL
844 && TREE_CODE (decl) != FIELD_DECL)
845 error_with_decl (decl,
846 "alignment may not be specified for `%s'");
849 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
850 DECL_USER_ALIGN (decl) = 1;
857 tree format_type_id = TREE_VALUE (args);
858 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
859 tree first_arg_num_expr
860 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
861 unsigned HOST_WIDE_INT format_num, first_arg_num;
862 enum format_type format_type;
864 unsigned int arg_num;
866 if (TREE_CODE (decl) != FUNCTION_DECL)
868 error_with_decl (decl,
869 "argument format specified for non-function `%s'");
873 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
875 error ("unrecognized format specifier");
880 const char *p = IDENTIFIER_POINTER (format_type_id);
882 if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
883 format_type = printf_format_type;
884 else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
885 format_type = scanf_format_type;
886 else if (!strcmp (p, "strftime")
887 || !strcmp (p, "__strftime__"))
888 format_type = strftime_format_type;
891 warning ("`%s' is an unrecognized format function type", p);
896 /* Strip any conversions from the string index and first arg number
897 and verify they are constants. */
898 while (TREE_CODE (format_num_expr) == NOP_EXPR
899 || TREE_CODE (format_num_expr) == CONVERT_EXPR
900 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
901 format_num_expr = TREE_OPERAND (format_num_expr, 0);
903 while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
904 || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
905 || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
906 first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
908 if (TREE_CODE (format_num_expr) != INTEGER_CST
909 || TREE_INT_CST_HIGH (format_num_expr) != 0
910 || TREE_CODE (first_arg_num_expr) != INTEGER_CST
911 || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
913 error ("format string has invalid operand number");
917 format_num = TREE_INT_CST_LOW (format_num_expr);
918 first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
919 if (first_arg_num != 0 && first_arg_num <= format_num)
921 error ("format string arg follows the args to be formatted");
925 /* If a parameter list is specified, verify that the format_num
926 argument is actually a string, in case the format attribute
928 argument = TYPE_ARG_TYPES (type);
931 for (arg_num = 1; argument != 0 && arg_num != format_num;
932 ++arg_num, argument = TREE_CHAIN (argument))
936 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
937 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
940 error ("format string arg not a string type");
944 else if (first_arg_num != 0)
946 /* Verify that first_arg_num points to the last arg,
949 arg_num++, argument = TREE_CHAIN (argument);
951 if (arg_num != first_arg_num)
953 error ("args to be formatted is not '...'");
959 record_function_format (DECL_NAME (decl),
960 DECL_ASSEMBLER_NAME (decl),
961 format_type, format_num, first_arg_num);
967 tree format_num_expr = TREE_VALUE (args);
968 unsigned HOST_WIDE_INT format_num;
969 unsigned int arg_num;
972 if (TREE_CODE (decl) != FUNCTION_DECL)
974 error_with_decl (decl,
975 "argument format specified for non-function `%s'");
979 /* Strip any conversions from the first arg number and verify it
981 while (TREE_CODE (format_num_expr) == NOP_EXPR
982 || TREE_CODE (format_num_expr) == CONVERT_EXPR
983 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
984 format_num_expr = TREE_OPERAND (format_num_expr, 0);
986 if (TREE_CODE (format_num_expr) != INTEGER_CST
987 || TREE_INT_CST_HIGH (format_num_expr) != 0)
989 error ("format string has invalid operand number");
993 format_num = TREE_INT_CST_LOW (format_num_expr);
995 /* If a parameter list is specified, verify that the format_num
996 argument is actually a string, in case the format attribute
998 argument = TYPE_ARG_TYPES (type);
1001 for (arg_num = 1; argument != 0 && arg_num != format_num;
1002 ++arg_num, argument = TREE_CHAIN (argument))
1006 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
1007 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
1010 error ("format string arg not a string type");
1015 if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
1016 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
1019 error ("function does not return string type");
1023 record_international_format (DECL_NAME (decl),
1024 DECL_ASSEMBLER_NAME (decl),
1030 declare_weak (decl);
1034 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
1035 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
1036 error_with_decl (decl,
1037 "`%s' defined both normally and as an alias");
1038 else if (decl_function_context (decl) == 0)
1042 id = TREE_VALUE (args);
1043 if (TREE_CODE (id) != STRING_CST)
1045 error ("alias arg not a string");
1048 id = get_identifier (TREE_STRING_POINTER (id));
1049 /* This counts as a use of the object pointed to. */
1052 if (TREE_CODE (decl) == FUNCTION_DECL)
1053 DECL_INITIAL (decl) = error_mark_node;
1055 DECL_EXTERNAL (decl) = 0;
1056 assemble_alias (decl, id);
1059 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1062 case A_NO_CHECK_MEMORY_USAGE:
1063 if (TREE_CODE (decl) != FUNCTION_DECL)
1065 error_with_decl (decl,
1066 "`%s' attribute applies only to functions",
1067 IDENTIFIER_POINTER (name));
1069 else if (DECL_INITIAL (decl))
1071 error_with_decl (decl,
1072 "can't set `%s' attribute after definition",
1073 IDENTIFIER_POINTER (name));
1076 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1079 case A_NO_INSTRUMENT_FUNCTION:
1080 if (TREE_CODE (decl) != FUNCTION_DECL)
1082 error_with_decl (decl,
1083 "`%s' attribute applies only to functions",
1084 IDENTIFIER_POINTER (name));
1086 else if (DECL_INITIAL (decl))
1088 error_with_decl (decl,
1089 "can't set `%s' attribute after definition",
1090 IDENTIFIER_POINTER (name));
1093 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1096 case A_NO_LIMIT_STACK:
1097 if (TREE_CODE (decl) != FUNCTION_DECL)
1099 error_with_decl (decl,
1100 "`%s' attribute applies only to functions",
1101 IDENTIFIER_POINTER (name));
1103 else if (DECL_INITIAL (decl))
1105 error_with_decl (decl,
1106 "can't set `%s' attribute after definition",
1107 IDENTIFIER_POINTER (name));
1110 DECL_NO_LIMIT_STACK (decl) = 1;
1116 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1117 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1119 The head of the declspec list is stored in DECLSPECS.
1120 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1122 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1123 the list elements. We drop the containing TREE_LIST nodes and link the
1124 resulting attributes together the way decl_attributes expects them. */
1127 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1129 tree *declspecs, *prefix_attributes;
1131 tree t, s, a, next, specs, attrs;
1133 /* This can happen after an __extension__ in pedantic mode. */
1134 if (specs_attrs != NULL_TREE
1135 && TREE_CODE (specs_attrs) == INTEGER_CST)
1137 *declspecs = NULL_TREE;
1138 *prefix_attributes = NULL_TREE;
1142 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1143 if (specs_attrs != NULL_TREE
1144 && TREE_CODE (specs_attrs) != TREE_LIST)
1146 *declspecs = specs_attrs;
1147 *prefix_attributes = NULL_TREE;
1151 /* Remember to keep the lists in the same order, element-wise. */
1153 specs = s = NULL_TREE;
1154 attrs = a = NULL_TREE;
1155 for (t = specs_attrs; t; t = next)
1157 next = TREE_CHAIN (t);
1158 /* Declspecs have a non-NULL TREE_VALUE. */
1159 if (TREE_VALUE (t) != NULL_TREE)
1161 if (specs == NULL_TREE)
1171 if (attrs == NULL_TREE)
1172 attrs = a = TREE_PURPOSE (t);
1175 TREE_CHAIN (a) = TREE_PURPOSE (t);
1176 a = TREE_PURPOSE (t);
1178 /* More attrs can be linked here, move A to the end. */
1179 while (TREE_CHAIN (a) != NULL_TREE)
1184 /* Terminate the lists. */
1186 TREE_CHAIN (s) = NULL_TREE;
1188 TREE_CHAIN (a) = NULL_TREE;
1192 *prefix_attributes = attrs;
1195 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1196 This function is used by the parser when a rule will accept attributes
1197 in a particular position, but we don't want to support that just yet.
1199 A warning is issued for every ignored attribute. */
1202 strip_attrs (specs_attrs)
1207 split_specs_attrs (specs_attrs, &specs, &attrs);
1211 warning ("`%s' attribute ignored",
1212 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1213 attrs = TREE_CHAIN (attrs);
1219 /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
1220 a parameter list. */
1222 /* The meaningfully distinct length modifiers for format checking recognised
1239 /* The standard versions in which various format features appeared. */
1240 enum format_std_version
1249 /* Structure describing a length modifier supported in format checking, and
1250 possibly a doubled version such as "hh". */
1253 /* Name of the single-character length modifier. */
1255 /* Index into a format_char_info.types array. */
1256 enum format_lengths index;
1257 /* Standard version this length appears in. */
1258 enum format_std_version std;
1259 /* Same, if the modifier can be repeated, or NULL if it can't. */
1260 const char *double_name;
1261 enum format_lengths double_index;
1262 enum format_std_version double_std;
1263 } format_length_info;
1266 /* Structure desribing the combination of a conversion specifier
1267 (or a set of specifiers which act identically) and a length modifier. */
1270 /* The standard version this combination of length and type appeared in.
1271 This is only relevant if greater than those for length and type
1272 individually; otherwise it is ignored. */
1273 enum format_std_version std;
1274 /* The name to use for the type, if different from that generated internally
1275 (e.g., "signed size_t"). */
1277 /* The type itself. */
1279 } format_type_detail;
1282 /* Macros to fill out tables of these. */
1283 #define BADLEN { 0, NULL, NULL }
1284 #define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
1287 /* Structure desribing a format conversion specifier (or a set of specifiers
1288 which act identically), and the length modifiers used with it. */
1291 const char *format_chars;
1293 enum format_std_version std;
1294 /* Types accepted for each length modifier. */
1295 format_type_detail types[FMT_LEN_MAX];
1296 /* List of other modifier characters allowed with these options.
1297 This lists flags, and additionally "w" for width, "p" for precision,
1298 "c" for generic character pointers being allowed, "a" for scanf
1299 "a" allocation extension (not applicable in C99 mode), "*" for
1300 scanf suppression, "2" for strftime two digit year formats, "3"
1301 for strftime formats giving two digit years in some locales, "E"
1302 and "O" for those strftime modifiers, "o" if use of strftime "O"
1303 is a GNU extension beyond C99, and "W" if the argument is a
1304 pointer which is dereferenced and written into. */
1305 const char *flag_chars;
1309 /* Structure describing a particular kind of format processed by GCC. */
1312 /* The name of this kind of format, for use in diagnostics. */
1314 /* Specifications of the length modifiers accepted; possibly NULL. */
1315 const format_length_info *length_char_specs;
1316 /* Details of the conversion specification characters accepted. */
1317 const format_char_info *conversion_specs;
1321 /* Structure describing details of a type expected in format checking,
1322 and the type to check against it. */
1323 typedef struct format_wanted_type
1325 /* The type wanted. */
1327 /* The name of this type to use in diagnostics. */
1328 const char *wanted_type_name;
1329 /* The level of indirection through pointers at which this type occurs. */
1331 /* Whether, when pointer_count is 1, to allow any character type when
1332 pedantic, rather than just the character or void type specified. */
1333 int char_lenient_flag;
1334 /* Whether the argument, dereferenced once, is written into and so the
1335 argument must not be a pointer to a const-qualified type. */
1336 int writing_in_flag;
1337 /* If warnings should be of the form "field precision is not type int",
1338 the name to use (in this case "field precision"), otherwise NULL,
1339 for "%s format, %s arg" type messages. If (in an extension), this
1340 is a pointer type, wanted_type_name should be set to include the
1341 terminating '*' characters of the type name to give a correct
1344 /* The actual parameter to check against the wanted type. */
1346 /* The argument number of that parameter. */
1348 /* The next type to check for this format conversion, or NULL if none. */
1349 struct format_wanted_type *next;
1350 } format_wanted_type;
1353 static const format_length_info printf_length_specs[] =
1355 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1356 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1357 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1358 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1359 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1360 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
1361 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1362 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1363 { NULL, 0, 0, NULL, 0, 0 }
1367 /* This differs from printf_length_specs only in that "Z" is not accepted. */
1368 static const format_length_info scanf_length_specs[] =
1370 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1371 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1372 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1373 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1374 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1375 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1376 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1377 { NULL, 0, 0, NULL, 0, 0 }
1381 #define T_I &integer_type_node
1382 #define T89_I { STD_C89, NULL, T_I }
1383 #define T99_I { STD_C99, NULL, T_I }
1384 #define T_L &long_integer_type_node
1385 #define T89_L { STD_C89, NULL, T_L }
1386 #define T_LL &long_long_integer_type_node
1387 #define T99_LL { STD_C99, NULL, T_LL }
1388 #define TEX_LL { STD_EXT, NULL, T_LL }
1389 #define T_S &short_integer_type_node
1390 #define T89_S { STD_C89, NULL, T_S }
1391 #define T_UI &unsigned_type_node
1392 #define T89_UI { STD_C89, NULL, T_UI }
1393 #define T99_UI { STD_C99, NULL, T_UI }
1394 #define T_UL &long_unsigned_type_node
1395 #define T89_UL { STD_C89, NULL, T_UL }
1396 #define T_ULL &long_long_unsigned_type_node
1397 #define T99_ULL { STD_C99, NULL, T_ULL }
1398 #define TEX_ULL { STD_EXT, NULL, T_ULL }
1399 #define T_US &short_unsigned_type_node
1400 #define T89_US { STD_C89, NULL, T_US }
1401 #define T_F &float_type_node
1402 #define T89_F { STD_C89, NULL, T_F }
1403 #define T99_F { STD_C99, NULL, T_F }
1404 #define T_D &double_type_node
1405 #define T89_D { STD_C89, NULL, T_D }
1406 #define T99_D { STD_C99, NULL, T_D }
1407 #define T_LD &long_double_type_node
1408 #define T89_LD { STD_C89, NULL, T_LD }
1409 #define T99_LD { STD_C99, NULL, T_LD }
1410 #define T_C &char_type_node
1411 #define T89_C { STD_C89, NULL, T_C }
1412 #define T_SC &signed_char_type_node
1413 #define T99_SC { STD_C99, NULL, T_SC }
1414 #define T_UC &unsigned_char_type_node
1415 #define T99_UC { STD_C99, NULL, T_UC }
1416 #define T_V &void_type_node
1417 #define T89_V { STD_C89, NULL, T_V }
1418 #define T_W &wchar_type_node
1419 #define T94_W { STD_C94, "wchar_t", T_W }
1420 #define TEX_W { STD_EXT, "wchar_t", T_W }
1421 #define T_WI &wint_type_node
1422 #define T94_WI { STD_C94, "wint_t", T_WI }
1423 #define TEX_WI { STD_EXT, "wint_t", T_WI }
1424 #define T_ST &c_size_type_node
1425 #define T99_ST { STD_C99, "size_t", T_ST }
1426 #define T_SST &signed_size_type_node
1427 #define T99_SST { STD_C99, "signed size_t", T_SST }
1428 #define T_PD &ptrdiff_type_node
1429 #define T99_PD { STD_C99, "ptrdiff_t", T_PD }
1430 #define T_UPD &unsigned_ptrdiff_type_node
1431 #define T99_UPD { STD_C99, "unsigned ptrdiff_t", T_UPD }
1432 #define T_IM NULL /* intmax_t not yet implemented. */
1433 #define T99_IM { STD_C99, "intmax_t", T_IM }
1434 #define T_UIM NULL /* uintmax_t not yet implemented. */
1435 #define T99_UIM { STD_C99, "uintmax_t", T_UIM }
1437 static const format_char_info print_char_table[] =
1439 /* C89 conversion specifiers. */
1440 { "di", 0, STD_C89, { T89_I, T99_I, T89_I, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I" },
1441 { "oxX", 0, STD_C89, { T89_UI, T99_UI, T89_UI, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#" },
1442 { "u", 0, STD_C89, { T89_UI, T99_UI, T89_UI, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I" },
1443 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'" },
1444 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#" },
1445 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w" },
1446 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wpc" },
1447 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wc" },
1448 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "W" },
1449 /* C99 conversion specifiers. */
1450 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'" },
1451 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#" },
1452 /* X/Open conversion specifiers. */
1453 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w" },
1454 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp" },
1455 /* GNU conversion specifiers. */
1456 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp" },
1457 { NULL, 0, 0, NOLENGTHS, NULL }
1460 static const format_char_info scan_char_table[] =
1462 /* C89 conversion specifiers. */
1463 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*wW" },
1464 { "ouxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*wW" },
1465 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*wW" },
1466 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*cwW" },
1467 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*acwW" },
1468 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*acwW" },
1469 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*wW" },
1470 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "W" },
1471 /* C99 conversion specifiers. */
1472 { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*wW" },
1473 /* X/Open conversion specifiers. */
1474 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*wW" },
1475 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*awW" },
1476 { NULL, 0, 0, NOLENGTHS, NULL }
1479 static format_char_info time_char_table[] =
1481 /* C89 conversion specifiers. */
1482 { "ABZab", 0, STD_C89, NOLENGTHS, "^#" },
1483 { "cx", 0, STD_C89, NOLENGTHS, "3E" },
1484 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow" },
1485 { "j", 0, STD_C89, NOLENGTHS, "-_0Oow" },
1486 { "p", 0, STD_C89, NOLENGTHS, "#" },
1487 { "X", 0, STD_C89, NOLENGTHS, "E" },
1488 { "y", 0, STD_C89, NOLENGTHS, "2EO-_0w" },
1489 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOow" },
1490 { "%", 0, STD_C89, NOLENGTHS, "" },
1491 /* C99 conversion specifiers. */
1492 { "C", 0, STD_C99, NOLENGTHS, "-_0EOow" },
1493 { "D", 0, STD_C99, NOLENGTHS, "2" },
1494 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow" },
1495 { "FRTnrt", 0, STD_C99, NOLENGTHS, "" },
1496 { "g", 0, STD_C99, NOLENGTHS, "2Oo-_0w" },
1497 { "G", 0, STD_C99, NOLENGTHS, "-_0Oow" },
1498 { "h", 0, STD_C99, NOLENGTHS, "^#" },
1499 { "z", 0, STD_C99, NOLENGTHS, "Oo" },
1500 /* GNU conversion specifiers. */
1501 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow" },
1502 { "P", 0, STD_EXT, NOLENGTHS, "" },
1503 { NULL, 0, 0, NOLENGTHS, NULL }
1507 /* This must be in the same order as enum format_type. */
1508 static const format_kind_info format_types[] =
1510 { "printf", printf_length_specs, print_char_table },
1511 { "scanf", scanf_length_specs, scan_char_table },
1512 { "strftime", NULL, time_char_table }
1516 typedef struct function_format_info
1518 struct function_format_info *next; /* next structure on the list */
1519 tree name; /* identifier such as "printf" */
1520 tree assembler_name; /* optional mangled identifier (for C++) */
1521 enum format_type format_type; /* type of format (printf, scanf, etc.) */
1522 int format_num; /* number of format argument */
1523 int first_arg_num; /* number of first arg (zero for varargs) */
1524 } function_format_info;
1526 static function_format_info *function_format_list = NULL;
1528 typedef struct international_format_info
1530 struct international_format_info *next; /* next structure on the list */
1531 tree name; /* identifier such as "gettext" */
1532 tree assembler_name; /* optional mangled identifier (for C++) */
1533 int format_num; /* number of format argument */
1534 } international_format_info;
1536 static international_format_info *international_format_list = NULL;
1538 static void check_format_info PARAMS ((function_format_info *, tree));
1540 static void init_dollar_format_checking PARAMS ((int, tree));
1541 static int maybe_read_dollar_number PARAMS ((const char **, int,
1543 static void finish_dollar_format_checking PARAMS ((void));
1545 static void check_format_types PARAMS ((format_wanted_type *));
1547 /* Initialize the table of functions to perform format checking on.
1548 The ISO C functions are always checked (whether <stdio.h> is
1549 included or not), since it is common to call printf without
1550 including <stdio.h>. There shouldn't be a problem with this,
1551 since ISO C reserves these function names whether you include the
1552 header file or not. In any case, the checking is harmless. With
1553 -ffreestanding, these default attributes are disabled, and must be
1554 specified manually if desired.
1556 Also initialize the name of function that modify the format string for
1557 internationalization purposes. */
1560 init_function_format_info ()
1564 /* Functions from ISO/IEC 9899:1990. */
1565 record_function_format (get_identifier ("printf"), NULL_TREE,
1566 printf_format_type, 1, 2);
1567 record_function_format (get_identifier ("fprintf"), NULL_TREE,
1568 printf_format_type, 2, 3);
1569 record_function_format (get_identifier ("sprintf"), NULL_TREE,
1570 printf_format_type, 2, 3);
1571 record_function_format (get_identifier ("scanf"), NULL_TREE,
1572 scanf_format_type, 1, 2);
1573 record_function_format (get_identifier ("fscanf"), NULL_TREE,
1574 scanf_format_type, 2, 3);
1575 record_function_format (get_identifier ("sscanf"), NULL_TREE,
1576 scanf_format_type, 2, 3);
1577 record_function_format (get_identifier ("vprintf"), NULL_TREE,
1578 printf_format_type, 1, 0);
1579 record_function_format (get_identifier ("vfprintf"), NULL_TREE,
1580 printf_format_type, 2, 0);
1581 record_function_format (get_identifier ("vsprintf"), NULL_TREE,
1582 printf_format_type, 2, 0);
1583 record_function_format (get_identifier ("strftime"), NULL_TREE,
1584 strftime_format_type, 3, 0);
1587 if (flag_hosted && flag_isoc99)
1589 /* ISO C99 adds the snprintf and vscanf family functions. */
1590 record_function_format (get_identifier ("snprintf"), NULL_TREE,
1591 printf_format_type, 3, 4);
1592 record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
1593 printf_format_type, 3, 0);
1594 record_function_format (get_identifier ("vscanf"), NULL_TREE,
1595 scanf_format_type, 1, 0);
1596 record_function_format (get_identifier ("vfscanf"), NULL_TREE,
1597 scanf_format_type, 2, 0);
1598 record_function_format (get_identifier ("vsscanf"), NULL_TREE,
1599 scanf_format_type, 2, 0);
1602 if (flag_hosted && flag_noniso_default_format_attributes)
1604 /* Uniforum/GNU gettext functions, not in ISO C. */
1605 record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
1606 record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
1607 record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
1611 /* Record information for argument format checking. FUNCTION_IDENT is
1612 the identifier node for the name of the function to check (its decl
1613 need not exist yet).
1614 FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
1615 of the argument which is the format control string (starting from 1).
1616 FIRST_ARG_NUM is the number of the first actual argument to check
1617 against the format string, or zero if no checking is not be done
1618 (e.g. for varargs such as vfprintf). */
1621 record_function_format (name, assembler_name, format_type,
1622 format_num, first_arg_num)
1624 tree assembler_name;
1625 enum format_type format_type;
1629 function_format_info *info;
1631 /* Re-use existing structure if it's there. */
1633 for (info = function_format_list; info; info = info->next)
1635 if (info->name == name && info->assembler_name == assembler_name)
1640 info = (function_format_info *) xmalloc (sizeof (function_format_info));
1641 info->next = function_format_list;
1642 function_format_list = info;
1645 info->assembler_name = assembler_name;
1648 info->format_type = format_type;
1649 info->format_num = format_num;
1650 info->first_arg_num = first_arg_num;
1653 /* Record information for the names of function that modify the format
1654 argument to format functions. FUNCTION_IDENT is the identifier node for
1655 the name of the function (its decl need not exist yet) and FORMAT_NUM is
1656 the number of the argument which is the format control string (starting
1660 record_international_format (name, assembler_name, format_num)
1662 tree assembler_name;
1665 international_format_info *info;
1667 /* Re-use existing structure if it's there. */
1669 for (info = international_format_list; info; info = info->next)
1671 if (info->name == name && info->assembler_name == assembler_name)
1678 = (international_format_info *)
1679 xmalloc (sizeof (international_format_info));
1680 info->next = international_format_list;
1681 international_format_list = info;
1684 info->assembler_name = assembler_name;
1687 info->format_num = format_num;
1693 warning ("too few arguments for format");
1696 /* Check the argument list of a call to printf, scanf, etc.
1697 NAME is the function identifier.
1698 ASSEMBLER_NAME is the function's assembler identifier.
1699 (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
1700 PARAMS is the list of argument values. */
1703 check_function_format (name, assembler_name, params)
1705 tree assembler_name;
1708 function_format_info *info;
1710 /* See if this function is a format function. */
1711 for (info = function_format_list; info; info = info->next)
1713 if (info->assembler_name
1714 ? (info->assembler_name == assembler_name)
1715 : (info->name == name))
1717 /* Yup; check it. */
1718 check_format_info (info, params);
1725 /* Variables used by the checking of $ operand number formats. */
1726 static char *dollar_arguments_used = NULL;
1727 static int dollar_arguments_alloc = 0;
1728 static int dollar_arguments_count;
1729 static int dollar_first_arg_num;
1730 static int dollar_max_arg_used;
1731 static int dollar_format_warned;
1733 /* Initialize the checking for a format string that may contain $
1734 parameter number specifications; we will need to keep track of whether
1735 each parameter has been used. FIRST_ARG_NUM is the number of the first
1736 argument that is a parameter to the format, or 0 for a vprintf-style
1737 function; PARAMS is the list of arguments starting at this argument. */
1740 init_dollar_format_checking (first_arg_num, params)
1744 dollar_first_arg_num = first_arg_num;
1745 dollar_arguments_count = 0;
1746 dollar_max_arg_used = 0;
1747 dollar_format_warned = 0;
1748 if (first_arg_num > 0)
1752 dollar_arguments_count++;
1753 params = TREE_CHAIN (params);
1756 if (dollar_arguments_alloc < dollar_arguments_count)
1758 if (dollar_arguments_used)
1759 free (dollar_arguments_used);
1760 dollar_arguments_alloc = dollar_arguments_count;
1761 dollar_arguments_used = xmalloc (dollar_arguments_alloc);
1763 if (dollar_arguments_alloc)
1764 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
1768 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
1769 is set, it is an error if one is not found; otherwise, it is OK. If
1770 such a number is found, check whether it is within range and mark that
1771 numbered operand as being used for later checking. Returns the operand
1772 number if found and within range, zero if no such number was found and
1773 this is OK, or -1 on error. PARAMS points to the first operand of the
1774 format; PARAM_PTR is made to point to the parameter referred to. If
1775 a $ format is found, *FORMAT is updated to point just after it. */
1778 maybe_read_dollar_number (format, dollar_needed, params, param_ptr)
1779 const char **format;
1786 const char *fcp = *format;
1787 if (*fcp < '0' || *fcp > '9')
1791 warning ("missing $ operand number in format");
1799 while (*fcp >= '0' && *fcp <= '9')
1802 nargnum = 10 * argnum + (*fcp - '0');
1803 if (nargnum < 0 || nargnum / 10 != argnum)
1812 warning ("missing $ operand number in format");
1819 if (pedantic && !dollar_format_warned)
1821 warning ("ISO C does not support %%n$ operand number formats");
1822 dollar_format_warned = 1;
1824 if (overflow_flag || argnum == 0
1825 || (dollar_first_arg_num && argnum > dollar_arguments_count))
1827 warning ("operand number out of range in format");
1830 if (argnum > dollar_max_arg_used)
1831 dollar_max_arg_used = argnum;
1832 /* For vprintf-style functions we may need to allocate more memory to
1833 track which arguments are used. */
1834 while (dollar_arguments_alloc < dollar_max_arg_used)
1837 nalloc = 2 * dollar_arguments_alloc + 16;
1838 dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
1839 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
1840 nalloc - dollar_arguments_alloc);
1841 dollar_arguments_alloc = nalloc;
1843 dollar_arguments_used[argnum - 1] = 1;
1844 if (dollar_first_arg_num)
1847 *param_ptr = params;
1848 for (i = 1; i < argnum && *param_ptr != 0; i++)
1849 *param_ptr = TREE_CHAIN (*param_ptr);
1851 if (*param_ptr == 0)
1853 /* This case shouldn't be caught here. */
1863 /* Finish the checking for a format string that used $ operand number formats
1864 instead of non-$ formats. We check for unused operands before used ones
1865 (a serious error, since the implementation of the format function
1866 can't know what types to pass to va_arg to find the later arguments).
1867 and for unused operands at the end of the format (if we know how many
1868 arguments the format had, so not for vprintf). If there were operand
1869 numbers out of range on a non-vprintf-style format, we won't have reached
1873 finish_dollar_format_checking ()
1876 for (i = 0; i < dollar_max_arg_used; i++)
1878 if (!dollar_arguments_used[i])
1879 warning ("format argument %d unused before used argument %d in $-style format",
1880 i + 1, dollar_max_arg_used);
1882 if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
1883 warning ("unused arguments in $-style format");
1887 /* Check the argument list of a call to printf, scanf, etc.
1888 INFO points to the function_format_info structure.
1889 PARAMS is the list of argument values. */
1892 check_format_info (info, params)
1893 function_format_info *info;
1898 int suppressed, wide, precise;
1899 const char *length_chars = NULL;
1900 enum format_lengths length_chars_val = FMT_LEN_none;
1901 enum format_std_version length_chars_std = STD_C89;
1908 tree main_arg_params;
1909 enum format_std_version wanted_type_std;
1910 const char *wanted_type_name;
1911 format_wanted_type width_wanted_type;
1912 format_wanted_type precision_wanted_type;
1913 format_wanted_type main_wanted_type;
1914 format_wanted_type *first_wanted_type;
1915 format_wanted_type *last_wanted_type;
1916 tree first_fillin_param;
1917 const char *format_chars;
1918 const format_kind_info *fki = NULL;
1919 const format_length_info *fli = NULL;
1920 const format_char_info *fci = NULL;
1922 /* -1 if no conversions taking an operand have been found; 0 if one has
1923 and it didn't use $; 1 if $ formats are in use. */
1924 int has_operand_number = -1;
1926 /* Skip to format argument. If the argument isn't available, there's
1927 no work for us to do; prototype checking will catch the problem. */
1928 for (arg_num = 1; ; ++arg_num)
1932 if (arg_num == info->format_num)
1934 params = TREE_CHAIN (params);
1936 format_tree = TREE_VALUE (params);
1937 params = TREE_CHAIN (params);
1938 if (format_tree == 0)
1941 /* We can only check the format if it's a string constant. */
1942 while (TREE_CODE (format_tree) == NOP_EXPR)
1943 format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
1945 if (TREE_CODE (format_tree) == CALL_EXPR
1946 && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
1947 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
1950 tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
1952 /* See if this is a call to a known internationalization function
1953 that modifies the format arg. */
1954 international_format_info *info;
1956 for (info = international_format_list; info; info = info->next)
1957 if (info->assembler_name
1958 ? (info->assembler_name == DECL_ASSEMBLER_NAME (function))
1959 : (info->name == DECL_NAME (function)))
1964 for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
1966 inner_args = TREE_CHAIN (inner_args), i++)
1967 if (i == info->format_num)
1969 format_tree = TREE_VALUE (inner_args);
1971 while (TREE_CODE (format_tree) == NOP_EXPR)
1972 format_tree = TREE_OPERAND (format_tree, 0);
1977 if (integer_zerop (format_tree))
1979 warning ("null format string");
1982 if (TREE_CODE (format_tree) != ADDR_EXPR)
1984 /* The user may get multiple warnings if the supplied argument
1985 isn't even a string pointer. */
1986 /* Functions taking a va_list normally pass a non-literal format
1987 string. These functions typically are declared with
1988 first_arg_num == 0, so avoid warning in those cases. */
1989 if (info->first_arg_num != 0 && warn_format > 1)
1990 warning ("format not a string literal, argument types not checked");
1993 format_tree = TREE_OPERAND (format_tree, 0);
1994 if (TREE_CODE (format_tree) != STRING_CST)
1996 /* The user may get multiple warnings if the supplied argument
1997 isn't even a string pointer. */
1998 /* Functions taking a va_list normally pass a non-literal format
1999 string. These functions typically are declared with
2000 first_arg_num == 0, so avoid warning in those cases. */
2001 if (info->first_arg_num != 0 && warn_format > 1)
2002 warning ("format not a string literal, argument types not checked");
2005 format_chars = TREE_STRING_POINTER (format_tree);
2006 format_length = TREE_STRING_LENGTH (format_tree);
2007 if (format_length <= 1)
2008 warning ("zero-length format string");
2009 if (format_chars[--format_length] != 0)
2011 warning ("unterminated format string");
2014 /* Skip to first argument to check. */
2015 while (arg_num + 1 < info->first_arg_num)
2019 params = TREE_CHAIN (params);
2023 first_fillin_param = params;
2024 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2025 fki = &format_types[info->format_type];
2029 first_wanted_type = NULL;
2030 last_wanted_type = NULL;
2031 if (*format_chars == 0)
2033 if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
2034 warning ("embedded `\\0' in format");
2035 if (info->first_arg_num != 0 && params != 0
2036 && has_operand_number <= 0)
2037 warning ("too many arguments for format");
2038 if (has_operand_number > 0)
2039 finish_dollar_format_checking ();
2042 if (*format_chars++ != '%')
2044 if (*format_chars == 0)
2046 warning ("spurious trailing `%%' in format");
2049 if (*format_chars == '%')
2055 suppressed = wide = precise = FALSE;
2057 main_arg_params = 0;
2058 if (info->format_type == scanf_format_type)
2060 int non_zero_width_char = FALSE;
2061 suppressed = *format_chars == '*';
2064 else if (has_operand_number != 0)
2067 opnum = maybe_read_dollar_number (&format_chars,
2068 has_operand_number == 1,
2075 has_operand_number = 1;
2076 main_arg_num = opnum + info->first_arg_num - 1;
2079 has_operand_number = 0;
2081 while (ISDIGIT (*format_chars))
2084 if (*format_chars != '0')
2085 non_zero_width_char = TRUE;
2088 if (wide && !non_zero_width_char)
2089 warning ("zero width in scanf format");
2091 else if (info->format_type == strftime_format_type)
2093 while (*format_chars != 0 && index ("_-0^#", *format_chars) != 0)
2096 warning ("ISO C does not support the strftime `%c' flag",
2098 if (index (flag_chars, *format_chars) != 0)
2100 warning ("repeated `%c' flag in format",
2106 i = strlen (flag_chars);
2107 flag_chars[i++] = *format_chars++;
2111 while (ISDIGIT ((unsigned char) *format_chars))
2116 if (wide && pedantic)
2117 warning ("ISO C does not support strftime format width");
2118 if (*format_chars == 'E' || *format_chars == 'O')
2120 i = strlen (flag_chars);
2121 flag_chars[i++] = *format_chars++;
2123 if (*format_chars == 'E' || *format_chars == 'O')
2125 warning ("multiple E/O modifiers in format");
2126 while (*format_chars == 'E' || *format_chars == 'O')
2131 else if (info->format_type == printf_format_type)
2133 if (has_operand_number != 0)
2136 opnum = maybe_read_dollar_number (&format_chars,
2137 0, first_fillin_param,
2143 has_operand_number = 1;
2144 main_arg_num = opnum + info->first_arg_num - 1;
2148 while (*format_chars != 0 && index (" +#0-'I", *format_chars) != 0)
2150 if (index (flag_chars, *format_chars) != 0)
2151 warning ("repeated `%c' flag in format", *format_chars++);
2154 i = strlen (flag_chars);
2155 flag_chars[i++] = *format_chars++;
2159 /* "If the space and + flags both appear,
2160 the space flag will be ignored." */
2161 if (index (flag_chars, ' ') != 0
2162 && index (flag_chars, '+') != 0)
2163 warning ("use of both ` ' and `+' flags in format");
2164 /* "If the 0 and - flags both appear,
2165 the 0 flag will be ignored." */
2166 if (index (flag_chars, '0') != 0
2167 && index (flag_chars, '-') != 0)
2168 warning ("use of both `0' and `-' flags in format");
2169 if (index (flag_chars, '\'') && pedantic)
2170 warning ("ISO C does not support the `'' format flag");
2171 if (index (flag_chars, 'I') && pedantic)
2172 warning ("ISO C does not support the `I' format flag");
2173 if (*format_chars == '*')
2176 /* "...a field width...may be indicated by an asterisk.
2177 In this case, an int argument supplies the field width..." */
2184 if (has_operand_number != 0)
2187 opnum = maybe_read_dollar_number (&format_chars,
2188 has_operand_number == 1,
2195 has_operand_number = 1;
2196 arg_num = opnum + info->first_arg_num - 1;
2199 has_operand_number = 0;
2201 if (info->first_arg_num != 0)
2203 cur_param = TREE_VALUE (params);
2204 if (has_operand_number <= 0)
2206 params = TREE_CHAIN (params);
2209 width_wanted_type.wanted_type = integer_type_node;
2210 width_wanted_type.wanted_type_name = NULL;
2211 width_wanted_type.pointer_count = 0;
2212 width_wanted_type.char_lenient_flag = 0;
2213 width_wanted_type.writing_in_flag = 0;
2214 width_wanted_type.name = _("field width");
2215 width_wanted_type.param = cur_param;
2216 width_wanted_type.arg_num = arg_num;
2217 width_wanted_type.next = NULL;
2218 if (last_wanted_type != 0)
2219 last_wanted_type->next = &width_wanted_type;
2220 if (first_wanted_type == 0)
2221 first_wanted_type = &width_wanted_type;
2222 last_wanted_type = &width_wanted_type;
2227 while (ISDIGIT (*format_chars))
2233 if (*format_chars == '.')
2237 /* "...a...precision...may be indicated by an asterisk.
2238 In this case, an int argument supplies the...precision." */
2239 if (*format_chars == '*')
2242 if (has_operand_number != 0)
2245 opnum = maybe_read_dollar_number (&format_chars,
2246 has_operand_number == 1,
2253 has_operand_number = 1;
2254 arg_num = opnum + info->first_arg_num - 1;
2257 has_operand_number = 0;
2259 if (info->first_arg_num != 0)
2266 cur_param = TREE_VALUE (params);
2267 if (has_operand_number <= 0)
2269 params = TREE_CHAIN (params);
2272 precision_wanted_type.wanted_type = integer_type_node;
2273 precision_wanted_type.wanted_type_name = NULL;
2274 precision_wanted_type.pointer_count = 0;
2275 precision_wanted_type.char_lenient_flag = 0;
2276 precision_wanted_type.writing_in_flag = 0;
2277 precision_wanted_type.name = _("field precision");
2278 precision_wanted_type.param = cur_param;
2279 precision_wanted_type.arg_num = arg_num;
2280 precision_wanted_type.next = NULL;
2281 if (last_wanted_type != 0)
2282 last_wanted_type->next = &precision_wanted_type;
2283 if (first_wanted_type == 0)
2284 first_wanted_type = &precision_wanted_type;
2285 last_wanted_type = &precision_wanted_type;
2290 while (ISDIGIT (*format_chars))
2298 fli = fki->length_char_specs;
2301 while (fli->name != 0 && fli->name[0] != *format_chars)
2306 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2309 length_chars = fli->double_name;
2310 length_chars_val = fli->double_index;
2311 length_chars_std = fli->double_std;
2315 length_chars = fli->name;
2316 length_chars_val = fli->index;
2317 length_chars_std = fli->std;
2322 length_chars = NULL;
2323 length_chars_val = FMT_LEN_none;
2324 length_chars_std = STD_C89;
2328 /* Warn if the length modifier is non-standard. */
2329 if (length_chars_std == STD_EXT)
2330 warning ("ISO C does not support the `%s' %s length modifier",
2331 length_chars, fki->name);
2332 else if ((length_chars_std == STD_C99 && !flag_isoc99)
2333 || (length_chars_std == STD_C94 && !flag_isoc94))
2334 warning ("ISO C89 does not support the `%s' %s length modifier",
2335 length_chars, fki->name);
2337 if (*format_chars == 'a' && info->format_type == scanf_format_type
2340 if (format_chars[1] == 's' || format_chars[1] == 'S'
2341 || format_chars[1] == '[')
2343 /* `a' is used as a flag. */
2348 if (suppressed && length_chars_val != FMT_LEN_none)
2349 warning ("use of `*' and `%s' together in format", length_chars);
2351 format_char = *format_chars;
2352 if (format_char == 0
2353 || (info->format_type != strftime_format_type && format_char == '%'))
2355 warning ("conversion lacks type at end of format");
2359 fci = fki->conversion_specs;
2360 while (fci->format_chars != 0
2361 && index (fci->format_chars, format_char) == 0)
2363 if (fci->format_chars == 0)
2365 if (ISGRAPH(format_char))
2366 warning ("unknown conversion type character `%c' in format",
2369 warning ("unknown conversion type character 0x%x in format",
2375 if (fci->std == STD_EXT)
2376 warning ("ISO C does not support the `%%%c' %s format",
2377 format_char, fki->name);
2378 else if ((fci->std == STD_C99 && !flag_isoc99)
2379 || (fci->std == STD_C94 && !flag_isoc94))
2380 warning ("ISO C89 does not support the `%%%c' %s format",
2381 format_char, fki->name);
2382 if (index (flag_chars, 'O') != 0)
2384 if (index (fci->flag_chars, 'o') != 0)
2385 warning ("ISO C does not support `%%O%c'", format_char);
2386 else if (!flag_isoc99 && index (fci->flag_chars, 'O') != 0)
2387 warning ("ISO C89 does not support `%%O%c'", format_char);
2389 if (!flag_isoc99 && index (flag_chars, 'E'))
2390 warning ("ISO C89 does not support `%%E%c'", format_char);
2392 if (wide && index (fci->flag_chars, 'w') == 0)
2393 warning ("width used with `%c' format", format_char);
2394 if (index (fci->flag_chars, '3') != 0
2395 || (format_char == 'y' && index (flag_chars, 'E')))
2396 warning ("`%%%c' yields only last 2 digits of year in some locales",
2398 else if (index (fci->flag_chars, '2') != 0)
2399 warning ("`%%%c' yields only last 2 digits of year", format_char);
2400 if (precise && index (fci->flag_chars, 'p') == 0)
2401 warning ("precision used with `%c' format", format_char);
2402 if (aflag && index (fci->flag_chars, 'a') == 0)
2404 warning ("`a' flag used with `%c' format", format_char);
2405 /* To simplify the following code. */
2408 /* The a flag is a GNU extension. */
2409 else if (pedantic && aflag)
2410 warning ("ISO C does not support the `a' flag");
2411 if (info->format_type == scanf_format_type && format_char == '[')
2413 /* Skip over scan set, in case it happens to have '%' in it. */
2414 if (*format_chars == '^')
2416 /* Find closing bracket; if one is hit immediately, then
2417 it's part of the scan set rather than a terminator. */
2418 if (*format_chars == ']')
2420 while (*format_chars && *format_chars != ']')
2422 if (*format_chars != ']')
2423 /* The end of the format string was reached. */
2424 warning ("no closing `]' for `%%[' format");
2428 if (index (fci->flag_chars, '*') == 0)
2429 warning ("suppression of `%c' conversion in format", format_char);
2432 for (i = 0; flag_chars[i] != 0; ++i)
2434 if (index (fci->flag_chars, flag_chars[i]) == 0)
2435 warning ("flag `%c' used with type `%c'",
2436 flag_chars[i], format_char);
2438 if (info->format_type == strftime_format_type)
2440 if (precise && index (flag_chars, '0') != 0
2441 && (format_char == 'd' || format_char == 'i'
2442 || format_char == 'o' || format_char == 'u'
2443 || format_char == 'x' || format_char == 'X'))
2444 warning ("`0' flag ignored with precision specifier and `%c' format",
2446 wanted_type = (fci->types[length_chars_val].type
2447 ? *fci->types[length_chars_val].type : 0);
2448 wanted_type_name = fci->types[length_chars_val].name;
2449 wanted_type_std = fci->types[length_chars_val].std;
2450 if (wanted_type == 0)
2452 warning ("use of `%s' length modifier with `%c' type character",
2453 length_chars, format_char);
2454 /* Heuristic: skip one argument when an invalid length/type
2455 combination is encountered. */
2462 params = TREE_CHAIN (params);
2466 /* Warn if non-standard, provided it is more non-standard
2467 than the length and type characters that may already
2468 have been warned for. */
2469 && wanted_type_std > length_chars_std
2470 && wanted_type_std > fci->std)
2472 if (wanted_type_std == STD_EXT)
2473 warning ("ISO C does not support the `%%%s%c' %s format",
2474 length_chars, format_char, fki->name);
2475 else if ((wanted_type_std == STD_C99 && !flag_isoc99)
2476 || (wanted_type_std == STD_C94 && !flag_isoc94))
2477 warning ("ISO C89 does not support the `%%%s%c' %s format",
2478 length_chars, format_char, fki->name);
2481 /* Finally. . .check type of argument against desired type! */
2482 if (info->first_arg_num == 0)
2484 if (fci->pointer_count == 0 && wanted_type == void_type_node)
2486 if (main_arg_num != 0)
2487 warning ("operand number specified for format taking no argument");
2491 if (main_arg_num != 0)
2493 arg_num = main_arg_num;
2494 params = main_arg_params;
2499 if (has_operand_number > 0)
2501 warning ("missing $ operand number in format");
2505 has_operand_number = 0;
2512 cur_param = TREE_VALUE (params);
2513 params = TREE_CHAIN (params);
2514 main_wanted_type.wanted_type = wanted_type;
2515 main_wanted_type.wanted_type_name = wanted_type_name;
2516 main_wanted_type.pointer_count = fci->pointer_count + aflag;
2517 main_wanted_type.char_lenient_flag = 0;
2518 if (index (fci->flag_chars, 'c') != 0)
2519 main_wanted_type.char_lenient_flag = 1;
2520 main_wanted_type.writing_in_flag = 0;
2521 if (index (fci->flag_chars, 'W') != 0)
2522 main_wanted_type.writing_in_flag = 1;
2523 main_wanted_type.name = NULL;
2524 main_wanted_type.param = cur_param;
2525 main_wanted_type.arg_num = arg_num;
2526 main_wanted_type.next = NULL;
2527 if (last_wanted_type != 0)
2528 last_wanted_type->next = &main_wanted_type;
2529 if (first_wanted_type == 0)
2530 first_wanted_type = &main_wanted_type;
2531 last_wanted_type = &main_wanted_type;
2534 if (first_wanted_type != 0)
2535 check_format_types (first_wanted_type);
2541 /* Check the argument types from a single format conversion (possibly
2542 including width and precision arguments). */
2544 check_format_types (types)
2545 format_wanted_type *types;
2547 for (; types != 0; types = types->next)
2556 cur_param = types->param;
2557 cur_type = TREE_TYPE (cur_param);
2558 if (TREE_CODE (cur_type) == ERROR_MARK)
2561 wanted_type = types->wanted_type;
2562 arg_num = types->arg_num;
2564 /* The following should not occur here. */
2565 if (wanted_type == 0)
2567 if (wanted_type == void_type_node && types->pointer_count == 0)
2570 STRIP_NOPS (cur_param);
2572 /* Check the types of any additional pointer arguments
2573 that precede the "real" argument. */
2574 for (i = 0; i < types->pointer_count; ++i)
2576 if (TREE_CODE (cur_type) == POINTER_TYPE)
2578 cur_type = TREE_TYPE (cur_type);
2579 if (TREE_CODE (cur_type) == ERROR_MARK)
2582 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2583 cur_param = TREE_OPERAND (cur_param, 0);
2587 /* See if this is an attempt to write into a const type with
2588 scanf or with printf "%n". Note: the writing in happens
2589 at the first indirection only, if for example
2590 void * const * is passed to scanf %p; passing
2591 const void ** is simply passing an incompatible type. */
2592 if (types->writing_in_flag
2594 && (TYPE_READONLY (cur_type)
2596 && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
2597 || (DECL_P (cur_param)
2598 && TREE_READONLY (cur_param))))))
2599 warning ("writing into constant object (arg %d)", arg_num);
2601 /* If there are extra type qualifiers beyond the first
2602 indirection, then this makes the types technically
2606 && (TYPE_READONLY (cur_type)
2607 || TYPE_VOLATILE (cur_type)
2608 || TYPE_RESTRICT (cur_type)))
2609 warning ("extra type qualifiers in format argument (arg %d)",
2615 if (types->pointer_count == 1)
2616 warning ("format argument is not a pointer (arg %d)", arg_num);
2618 warning ("format argument is not a pointer to a pointer (arg %d)", arg_num);
2623 if (i < types->pointer_count)
2626 orig_cur_type = cur_type;
2627 cur_type = TYPE_MAIN_VARIANT (cur_type);
2629 /* Check whether the argument type is a character type. This leniency
2630 only applies to certain formats, flagged with 'c'.
2632 if (types->char_lenient_flag)
2633 char_type_flag = (cur_type == char_type_node
2634 || cur_type == signed_char_type_node
2635 || cur_type == unsigned_char_type_node);
2637 /* Check the type of the "real" argument, if there's a type we want. */
2638 if (wanted_type == cur_type)
2640 /* If we want `void *', allow any pointer type.
2641 (Anything else would already have got a warning.)
2642 With -pedantic, only allow pointers to void and to character
2644 if (wanted_type == void_type_node
2645 && (!pedantic || (i == 1 && char_type_flag)))
2647 /* Don't warn about differences merely in signedness, unless
2648 -pedantic. With -pedantic, warn if the type is a pointer
2649 target and not a character type, and for character types at
2650 a second level of indirection. */
2651 if (TREE_CODE (wanted_type) == INTEGER_TYPE
2652 && TREE_CODE (cur_type) == INTEGER_TYPE
2653 && (! pedantic || i == 0 || (i == 1 && char_type_flag))
2654 && (TREE_UNSIGNED (wanted_type)
2655 ? wanted_type == unsigned_type (cur_type)
2656 : wanted_type == signed_type (cur_type)))
2658 /* Likewise, "signed char", "unsigned char" and "char" are
2659 equivalent but the above test won't consider them equivalent. */
2660 if (wanted_type == char_type_node
2661 && (! pedantic || i < 2)
2664 /* Now we have a type mismatch. */
2666 register const char *this;
2667 register const char *that;
2669 this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
2671 if (TYPE_NAME (orig_cur_type) != 0
2672 && TREE_CODE (orig_cur_type) != INTEGER_TYPE
2673 && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
2674 && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
2676 if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
2677 && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
2678 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
2680 that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
2683 /* A nameless type can't possibly match what the format wants.
2684 So there will be a warning for it.
2685 Make up a string to describe vaguely what it is. */
2688 if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
2691 that = "different type";
2694 /* Make the warning better in case of mismatch of int vs long. */
2695 if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
2696 && TREE_CODE (wanted_type) == INTEGER_TYPE
2697 && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
2698 && TYPE_NAME (orig_cur_type) != 0
2699 && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
2700 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
2702 if (strcmp (this, that) != 0)
2704 /* There may be a better name for the format, e.g. size_t,
2705 but we should allow for programs with a perverse typedef
2706 making size_t something other than what the compiler
2708 if (types->wanted_type_name != 0
2709 && strcmp (types->wanted_type_name, that) != 0)
2710 this = types->wanted_type_name;
2711 if (types->name != 0)
2712 warning ("%s is not type %s (arg %d)", types->name, this,
2715 warning ("%s format, %s arg (arg %d)", this, that, arg_num);
2721 /* Print a warning if a constant expression had overflow in folding.
2722 Invoke this function on every expression that the language
2723 requires to be a constant expression.
2724 Note the ANSI C standard says it is erroneous for a
2725 constant expression to overflow. */
2728 constant_expression_warning (value)
2731 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
2732 || TREE_CODE (value) == COMPLEX_CST)
2733 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
2734 pedwarn ("overflow in constant expression");
2737 /* Print a warning if an expression had overflow in folding.
2738 Invoke this function on every expression that
2739 (1) appears in the source code, and
2740 (2) might be a constant expression that overflowed, and
2741 (3) is not already checked by convert_and_check;
2742 however, do not invoke this function on operands of explicit casts. */
2745 overflow_warning (value)
2748 if ((TREE_CODE (value) == INTEGER_CST
2749 || (TREE_CODE (value) == COMPLEX_CST
2750 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
2751 && TREE_OVERFLOW (value))
2753 TREE_OVERFLOW (value) = 0;
2754 if (skip_evaluation == 0)
2755 warning ("integer overflow in expression");
2757 else if ((TREE_CODE (value) == REAL_CST
2758 || (TREE_CODE (value) == COMPLEX_CST
2759 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
2760 && TREE_OVERFLOW (value))
2762 TREE_OVERFLOW (value) = 0;
2763 if (skip_evaluation == 0)
2764 warning ("floating point overflow in expression");
2768 /* Print a warning if a large constant is truncated to unsigned,
2769 or if -Wconversion is used and a constant < 0 is converted to unsigned.
2770 Invoke this function on every expression that might be implicitly
2771 converted to an unsigned type. */
2774 unsigned_conversion_warning (result, operand)
2775 tree result, operand;
2777 if (TREE_CODE (operand) == INTEGER_CST
2778 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
2779 && TREE_UNSIGNED (TREE_TYPE (result))
2780 && skip_evaluation == 0
2781 && !int_fits_type_p (operand, TREE_TYPE (result)))
2783 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
2784 /* This detects cases like converting -129 or 256 to unsigned char. */
2785 warning ("large integer implicitly truncated to unsigned type");
2786 else if (warn_conversion)
2787 warning ("negative integer implicitly converted to unsigned type");
2791 /* Convert EXPR to TYPE, warning about conversion problems with constants.
2792 Invoke this function on every expression that is converted implicitly,
2793 i.e. because of language rules and not because of an explicit cast. */
2796 convert_and_check (type, expr)
2799 tree t = convert (type, expr);
2800 if (TREE_CODE (t) == INTEGER_CST)
2802 if (TREE_OVERFLOW (t))
2804 TREE_OVERFLOW (t) = 0;
2806 /* Do not diagnose overflow in a constant expression merely
2807 because a conversion overflowed. */
2808 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
2810 /* No warning for converting 0x80000000 to int. */
2811 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
2812 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
2813 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
2814 /* If EXPR fits in the unsigned version of TYPE,
2815 don't warn unless pedantic. */
2817 || TREE_UNSIGNED (type)
2818 || ! int_fits_type_p (expr, unsigned_type (type)))
2819 && skip_evaluation == 0)
2820 warning ("overflow in implicit constant conversion");
2823 unsigned_conversion_warning (t, expr);
2829 c_expand_expr_stmt (expr)
2832 /* Do default conversion if safe and possibly important,
2833 in case within ({...}). */
2834 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
2835 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
2836 expr = default_conversion (expr);
2838 if (TREE_TYPE (expr) != error_mark_node
2839 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
2840 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
2841 error ("expression statement has incomplete type");
2843 last_expr_type = TREE_TYPE (expr);
2844 add_stmt (build_stmt (EXPR_STMT, expr));
2847 /* Validate the expression after `case' and apply default promotions. */
2850 check_case_value (value)
2853 if (value == NULL_TREE)
2856 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
2857 STRIP_TYPE_NOPS (value);
2858 /* In C++, the following is allowed:
2861 switch (...) { case i: ... }
2863 So, we try to reduce the VALUE to a constant that way. */
2864 if (c_language == clk_cplusplus)
2866 value = decl_constant_value (value);
2867 STRIP_TYPE_NOPS (value);
2868 value = fold (value);
2871 if (TREE_CODE (value) != INTEGER_CST
2872 && value != error_mark_node)
2874 error ("case label does not reduce to an integer constant");
2875 value = error_mark_node;
2878 /* Promote char or short to int. */
2879 value = default_conversion (value);
2881 constant_expression_warning (value);
2886 /* Return an integer type with BITS bits of precision,
2887 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
2890 type_for_size (bits, unsignedp)
2894 if (bits == TYPE_PRECISION (integer_type_node))
2895 return unsignedp ? unsigned_type_node : integer_type_node;
2897 if (bits == TYPE_PRECISION (signed_char_type_node))
2898 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2900 if (bits == TYPE_PRECISION (short_integer_type_node))
2901 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2903 if (bits == TYPE_PRECISION (long_integer_type_node))
2904 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2906 if (bits == TYPE_PRECISION (long_long_integer_type_node))
2907 return (unsignedp ? long_long_unsigned_type_node
2908 : long_long_integer_type_node);
2910 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
2911 return (unsignedp ? widest_unsigned_literal_type_node
2912 : widest_integer_literal_type_node);
2914 if (bits <= TYPE_PRECISION (intQI_type_node))
2915 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2917 if (bits <= TYPE_PRECISION (intHI_type_node))
2918 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2920 if (bits <= TYPE_PRECISION (intSI_type_node))
2921 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2923 if (bits <= TYPE_PRECISION (intDI_type_node))
2924 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2929 /* Return a data type that has machine mode MODE.
2930 If the mode is an integer,
2931 then UNSIGNEDP selects between signed and unsigned types. */
2934 type_for_mode (mode, unsignedp)
2935 enum machine_mode mode;
2938 if (mode == TYPE_MODE (integer_type_node))
2939 return unsignedp ? unsigned_type_node : integer_type_node;
2941 if (mode == TYPE_MODE (signed_char_type_node))
2942 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2944 if (mode == TYPE_MODE (short_integer_type_node))
2945 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2947 if (mode == TYPE_MODE (long_integer_type_node))
2948 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2950 if (mode == TYPE_MODE (long_long_integer_type_node))
2951 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
2953 if (mode == TYPE_MODE (widest_integer_literal_type_node))
2954 return unsignedp ? widest_unsigned_literal_type_node
2955 : widest_integer_literal_type_node;
2957 if (mode == TYPE_MODE (intQI_type_node))
2958 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2960 if (mode == TYPE_MODE (intHI_type_node))
2961 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2963 if (mode == TYPE_MODE (intSI_type_node))
2964 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2966 if (mode == TYPE_MODE (intDI_type_node))
2967 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2969 #if HOST_BITS_PER_WIDE_INT >= 64
2970 if (mode == TYPE_MODE (intTI_type_node))
2971 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2974 if (mode == TYPE_MODE (float_type_node))
2975 return float_type_node;
2977 if (mode == TYPE_MODE (double_type_node))
2978 return double_type_node;
2980 if (mode == TYPE_MODE (long_double_type_node))
2981 return long_double_type_node;
2983 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
2984 return build_pointer_type (char_type_node);
2986 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
2987 return build_pointer_type (integer_type_node);
2989 #ifdef VECTOR_MODE_SUPPORTED_P
2990 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2991 return V4SF_type_node;
2992 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2993 return V4SI_type_node;
2994 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2995 return V2SI_type_node;
2996 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2997 return V4HI_type_node;
2998 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2999 return V8QI_type_node;
3005 /* Return an unsigned type the same as TYPE in other respects. */
3007 unsigned_type (type)
3010 tree type1 = TYPE_MAIN_VARIANT (type);
3011 if (type1 == signed_char_type_node || type1 == char_type_node)
3012 return unsigned_char_type_node;
3013 if (type1 == integer_type_node)
3014 return unsigned_type_node;
3015 if (type1 == short_integer_type_node)
3016 return short_unsigned_type_node;
3017 if (type1 == long_integer_type_node)
3018 return long_unsigned_type_node;
3019 if (type1 == long_long_integer_type_node)
3020 return long_long_unsigned_type_node;
3021 if (type1 == widest_integer_literal_type_node)
3022 return widest_unsigned_literal_type_node;
3023 #if HOST_BITS_PER_WIDE_INT >= 64
3024 if (type1 == intTI_type_node)
3025 return unsigned_intTI_type_node;
3027 if (type1 == intDI_type_node)
3028 return unsigned_intDI_type_node;
3029 if (type1 == intSI_type_node)
3030 return unsigned_intSI_type_node;
3031 if (type1 == intHI_type_node)
3032 return unsigned_intHI_type_node;
3033 if (type1 == intQI_type_node)
3034 return unsigned_intQI_type_node;
3036 return signed_or_unsigned_type (1, type);
3039 /* Return a signed type the same as TYPE in other respects. */
3045 tree type1 = TYPE_MAIN_VARIANT (type);
3046 if (type1 == unsigned_char_type_node || type1 == char_type_node)
3047 return signed_char_type_node;
3048 if (type1 == unsigned_type_node)
3049 return integer_type_node;
3050 if (type1 == short_unsigned_type_node)
3051 return short_integer_type_node;
3052 if (type1 == long_unsigned_type_node)
3053 return long_integer_type_node;
3054 if (type1 == long_long_unsigned_type_node)
3055 return long_long_integer_type_node;
3056 if (type1 == widest_unsigned_literal_type_node)
3057 return widest_integer_literal_type_node;
3058 #if HOST_BITS_PER_WIDE_INT >= 64
3059 if (type1 == unsigned_intTI_type_node)
3060 return intTI_type_node;
3062 if (type1 == unsigned_intDI_type_node)
3063 return intDI_type_node;
3064 if (type1 == unsigned_intSI_type_node)
3065 return intSI_type_node;
3066 if (type1 == unsigned_intHI_type_node)
3067 return intHI_type_node;
3068 if (type1 == unsigned_intQI_type_node)
3069 return intQI_type_node;
3071 return signed_or_unsigned_type (0, type);
3074 /* Return a type the same as TYPE except unsigned or
3075 signed according to UNSIGNEDP. */
3078 signed_or_unsigned_type (unsignedp, type)
3082 if (! INTEGRAL_TYPE_P (type)
3083 || TREE_UNSIGNED (type) == unsignedp)
3086 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
3087 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3088 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
3089 return unsignedp ? unsigned_type_node : integer_type_node;
3090 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
3091 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3092 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
3093 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3094 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
3095 return (unsignedp ? long_long_unsigned_type_node
3096 : long_long_integer_type_node);
3097 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
3098 return (unsignedp ? widest_unsigned_literal_type_node
3099 : widest_integer_literal_type_node);
3103 /* Return the minimum number of bits needed to represent VALUE in a
3104 signed or unsigned type, UNSIGNEDP says which. */
3107 min_precision (value, unsignedp)
3113 /* If the value is negative, compute its negative minus 1. The latter
3114 adjustment is because the absolute value of the largest negative value
3115 is one larger than the largest positive value. This is equivalent to
3116 a bit-wise negation, so use that operation instead. */
3118 if (tree_int_cst_sgn (value) < 0)
3119 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
3121 /* Return the number of bits needed, taking into account the fact
3122 that we need one more bit for a signed than unsigned type. */
3124 if (integer_zerop (value))
3127 log = tree_floor_log2 (value);
3129 return log + 1 + ! unsignedp;
3132 /* Print an error message for invalid operands to arith operation CODE.
3133 NOP_EXPR is used as a special case (see truthvalue_conversion). */
3136 binary_op_error (code)
3137 enum tree_code code;
3139 register const char *opname;
3144 error ("invalid truth-value expression");
3148 opname = "+"; break;
3150 opname = "-"; break;
3152 opname = "*"; break;
3154 opname = "max"; break;
3156 opname = "min"; break;
3158 opname = "=="; break;
3160 opname = "!="; break;
3162 opname = "<="; break;
3164 opname = ">="; break;
3166 opname = "<"; break;
3168 opname = ">"; break;
3170 opname = "<<"; break;
3172 opname = ">>"; break;
3173 case TRUNC_MOD_EXPR:
3174 case FLOOR_MOD_EXPR:
3175 opname = "%"; break;
3176 case TRUNC_DIV_EXPR:
3177 case FLOOR_DIV_EXPR:
3178 opname = "/"; break;
3180 opname = "&"; break;
3182 opname = "|"; break;
3183 case TRUTH_ANDIF_EXPR:
3184 opname = "&&"; break;
3185 case TRUTH_ORIF_EXPR:
3186 opname = "||"; break;
3188 opname = "^"; break;
3191 opname = "rotate"; break;
3193 opname = "unknown"; break;
3195 error ("invalid operands to binary %s", opname);
3198 /* Subroutine of build_binary_op, used for comparison operations.
3199 See if the operands have both been converted from subword integer types
3200 and, if so, perhaps change them both back to their original type.
3201 This function is also responsible for converting the two operands
3202 to the proper common type for comparison.
3204 The arguments of this function are all pointers to local variables
3205 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
3206 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
3208 If this function returns nonzero, it means that the comparison has
3209 a constant value. What this function returns is an expression for
3213 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
3214 tree *op0_ptr, *op1_ptr;
3216 enum tree_code *rescode_ptr;
3219 tree op0 = *op0_ptr;
3220 tree op1 = *op1_ptr;
3221 int unsignedp0, unsignedp1;
3223 tree primop0, primop1;
3224 enum tree_code code = *rescode_ptr;
3226 /* Throw away any conversions to wider types
3227 already present in the operands. */
3229 primop0 = get_narrower (op0, &unsignedp0);
3230 primop1 = get_narrower (op1, &unsignedp1);
3232 /* Handle the case that OP0 does not *contain* a conversion
3233 but it *requires* conversion to FINAL_TYPE. */
3235 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
3236 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
3237 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
3238 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
3240 /* If one of the operands must be floated, we cannot optimize. */
3241 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
3242 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
3244 /* If first arg is constant, swap the args (changing operation
3245 so value is preserved), for canonicalization. Don't do this if
3246 the second arg is 0. */
3248 if (TREE_CONSTANT (primop0)
3249 && ! integer_zerop (primop1) && ! real_zerop (primop1))
3251 register tree tem = primop0;
3252 register int temi = unsignedp0;
3260 unsignedp0 = unsignedp1;
3283 *rescode_ptr = code;
3286 /* If comparing an integer against a constant more bits wide,
3287 maybe we can deduce a value of 1 or 0 independent of the data.
3288 Or else truncate the constant now
3289 rather than extend the variable at run time.
3291 This is only interesting if the constant is the wider arg.
3292 Also, it is not safe if the constant is unsigned and the
3293 variable arg is signed, since in this case the variable
3294 would be sign-extended and then regarded as unsigned.
3295 Our technique fails in this case because the lowest/highest
3296 possible unsigned results don't follow naturally from the
3297 lowest/highest possible values of the variable operand.
3298 For just EQ_EXPR and NE_EXPR there is another technique that
3299 could be used: see if the constant can be faithfully represented
3300 in the other operand's type, by truncating it and reextending it
3301 and see if that preserves the constant's value. */
3303 if (!real1 && !real2
3304 && TREE_CODE (primop1) == INTEGER_CST
3305 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
3307 int min_gt, max_gt, min_lt, max_lt;
3308 tree maxval, minval;
3309 /* 1 if comparison is nominally unsigned. */
3310 int unsignedp = TREE_UNSIGNED (*restype_ptr);
3313 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
3315 /* If TYPE is an enumeration, then we need to get its min/max
3316 values from it's underlying integral type, not the enumerated
3318 if (TREE_CODE (type) == ENUMERAL_TYPE)
3319 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
3321 maxval = TYPE_MAX_VALUE (type);
3322 minval = TYPE_MIN_VALUE (type);
3324 if (unsignedp && !unsignedp0)
3325 *restype_ptr = signed_type (*restype_ptr);
3327 if (TREE_TYPE (primop1) != *restype_ptr)
3328 primop1 = convert (*restype_ptr, primop1);
3329 if (type != *restype_ptr)
3331 minval = convert (*restype_ptr, minval);
3332 maxval = convert (*restype_ptr, maxval);
3335 if (unsignedp && unsignedp0)
3337 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
3338 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
3339 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
3340 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
3344 min_gt = INT_CST_LT (primop1, minval);
3345 max_gt = INT_CST_LT (primop1, maxval);
3346 min_lt = INT_CST_LT (minval, primop1);
3347 max_lt = INT_CST_LT (maxval, primop1);
3351 /* This used to be a switch, but Genix compiler can't handle that. */
3352 if (code == NE_EXPR)
3354 if (max_lt || min_gt)
3355 val = boolean_true_node;
3357 else if (code == EQ_EXPR)
3359 if (max_lt || min_gt)
3360 val = boolean_false_node;
3362 else if (code == LT_EXPR)
3365 val = boolean_true_node;
3367 val = boolean_false_node;
3369 else if (code == GT_EXPR)
3372 val = boolean_true_node;
3374 val = boolean_false_node;
3376 else if (code == LE_EXPR)
3379 val = boolean_true_node;
3381 val = boolean_false_node;
3383 else if (code == GE_EXPR)
3386 val = boolean_true_node;
3388 val = boolean_false_node;
3391 /* If primop0 was sign-extended and unsigned comparison specd,
3392 we did a signed comparison above using the signed type bounds.
3393 But the comparison we output must be unsigned.
3395 Also, for inequalities, VAL is no good; but if the signed
3396 comparison had *any* fixed result, it follows that the
3397 unsigned comparison just tests the sign in reverse
3398 (positive values are LE, negative ones GE).
3399 So we can generate an unsigned comparison
3400 against an extreme value of the signed type. */
3402 if (unsignedp && !unsignedp0)
3409 primop1 = TYPE_MIN_VALUE (type);
3415 primop1 = TYPE_MAX_VALUE (type);
3422 type = unsigned_type (type);
3425 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3427 /* This is the case of (char)x >?< 0x80, which people used to use
3428 expecting old C compilers to change the 0x80 into -0x80. */
3429 if (val == boolean_false_node)
3430 warning ("comparison is always false due to limited range of data type");
3431 if (val == boolean_true_node)
3432 warning ("comparison is always true due to limited range of data type");
3435 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
3437 /* This is the case of (unsigned char)x >?< -1 or < 0. */
3438 if (val == boolean_false_node)
3439 warning ("comparison is always false due to limited range of data type");
3440 if (val == boolean_true_node)
3441 warning ("comparison is always true due to limited range of data type");
3446 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3447 if (TREE_SIDE_EFFECTS (primop0))
3448 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
3452 /* Value is not predetermined, but do the comparison
3453 in the type of the operand that is not constant.
3454 TYPE is already properly set. */
3456 else if (real1 && real2
3457 && (TYPE_PRECISION (TREE_TYPE (primop0))
3458 == TYPE_PRECISION (TREE_TYPE (primop1))))
3459 type = TREE_TYPE (primop0);
3461 /* If args' natural types are both narrower than nominal type
3462 and both extend in the same manner, compare them
3463 in the type of the wider arg.
3464 Otherwise must actually extend both to the nominal
3465 common type lest different ways of extending
3467 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
3469 else if (unsignedp0 == unsignedp1 && real1 == real2
3470 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
3471 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
3473 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
3474 type = signed_or_unsigned_type (unsignedp0
3475 || TREE_UNSIGNED (*restype_ptr),
3477 /* Make sure shorter operand is extended the right way
3478 to match the longer operand. */
3479 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
3481 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
3486 /* Here we must do the comparison on the nominal type
3487 using the args exactly as we received them. */
3488 type = *restype_ptr;
3492 if (!real1 && !real2 && integer_zerop (primop1)
3493 && TREE_UNSIGNED (*restype_ptr))
3499 /* All unsigned values are >= 0, so we warn if extra warnings
3500 are requested. However, if OP0 is a constant that is
3501 >= 0, the signedness of the comparison isn't an issue,
3502 so suppress the warning. */
3503 if (extra_warnings && !in_system_header
3504 && ! (TREE_CODE (primop0) == INTEGER_CST
3505 && ! TREE_OVERFLOW (convert (signed_type (type),
3507 warning ("comparison of unsigned expression >= 0 is always true");
3508 value = boolean_true_node;
3512 if (extra_warnings && !in_system_header
3513 && ! (TREE_CODE (primop0) == INTEGER_CST
3514 && ! TREE_OVERFLOW (convert (signed_type (type),
3516 warning ("comparison of unsigned expression < 0 is always false");
3517 value = boolean_false_node;
3526 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
3527 if (TREE_SIDE_EFFECTS (primop0))
3528 return build (COMPOUND_EXPR, TREE_TYPE (value),
3535 *op0_ptr = convert (type, primop0);
3536 *op1_ptr = convert (type, primop1);
3538 *restype_ptr = boolean_type_node;
3543 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
3544 or validate its data type for an `if' or `while' statement or ?..: exp.
3546 This preparation consists of taking the ordinary
3547 representation of an expression expr and producing a valid tree
3548 boolean expression describing whether expr is nonzero. We could
3549 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
3550 but we optimize comparisons, &&, ||, and !.
3552 The resulting type should always be `boolean_type_node'. */
3555 truthvalue_conversion (expr)
3558 if (TREE_CODE (expr) == ERROR_MARK)
3561 #if 0 /* This appears to be wrong for C++. */
3562 /* These really should return error_mark_node after 2.4 is stable.
3563 But not all callers handle ERROR_MARK properly. */
3564 switch (TREE_CODE (TREE_TYPE (expr)))
3567 error ("struct type value used where scalar is required");
3568 return boolean_false_node;
3571 error ("union type value used where scalar is required");
3572 return boolean_false_node;
3575 error ("array type value used where scalar is required");
3576 return boolean_false_node;
3583 switch (TREE_CODE (expr))
3586 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3587 case TRUTH_ANDIF_EXPR:
3588 case TRUTH_ORIF_EXPR:
3589 case TRUTH_AND_EXPR:
3591 case TRUTH_XOR_EXPR:
3592 case TRUTH_NOT_EXPR:
3593 TREE_TYPE (expr) = boolean_type_node;
3600 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
3603 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
3606 /* If we are taking the address of a external decl, it might be zero
3607 if it is weak, so we cannot optimize. */
3608 if (DECL_P (TREE_OPERAND (expr, 0))
3609 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
3612 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
3613 return build (COMPOUND_EXPR, boolean_type_node,
3614 TREE_OPERAND (expr, 0), boolean_true_node);
3616 return boolean_true_node;
3619 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
3620 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3621 truthvalue_conversion (TREE_OPERAND (expr, 0)),
3622 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3629 /* These don't change whether an object is non-zero or zero. */
3630 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3634 /* These don't change whether an object is zero or non-zero, but
3635 we can't ignore them if their second arg has side-effects. */
3636 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
3637 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
3638 truthvalue_conversion (TREE_OPERAND (expr, 0)));
3640 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3643 /* Distribute the conversion into the arms of a COND_EXPR. */
3644 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
3645 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3646 truthvalue_conversion (TREE_OPERAND (expr, 2))));
3649 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
3650 since that affects how `default_conversion' will behave. */
3651 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
3652 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
3654 /* fall through... */
3656 /* If this is widening the argument, we can ignore it. */
3657 if (TYPE_PRECISION (TREE_TYPE (expr))
3658 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
3659 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3663 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
3665 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
3666 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
3668 /* fall through... */
3670 /* This and MINUS_EXPR can be changed into a comparison of the
3672 if (TREE_TYPE (TREE_OPERAND (expr, 0))
3673 == TREE_TYPE (TREE_OPERAND (expr, 1)))
3674 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3675 TREE_OPERAND (expr, 1), 1);
3676 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3677 fold (build1 (NOP_EXPR,
3678 TREE_TYPE (TREE_OPERAND (expr, 0)),
3679 TREE_OPERAND (expr, 1))), 1);
3682 if (integer_onep (TREE_OPERAND (expr, 1))
3683 && TREE_TYPE (expr) != boolean_type_node)
3684 /* Using convert here would cause infinite recursion. */
3685 return build1 (NOP_EXPR, boolean_type_node, expr);
3689 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
3690 warning ("suggest parentheses around assignment used as truth value");
3697 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
3699 tree tem = save_expr (expr);
3700 return (build_binary_op
3701 ((TREE_SIDE_EFFECTS (expr)
3702 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3703 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
3704 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
3708 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
3712 /* Read the rest of a #-directive from input stream FINPUT.
3713 In normal use, the directive name and the white space after it
3714 have already been read, so they won't be included in the result.
3715 We allow for the fact that the directive line may contain
3716 a newline embedded within a character or string literal which forms
3717 a part of the directive.
3719 The value is a string in a reusable buffer. It remains valid
3720 only until the next time this function is called.
3722 The terminating character ('\n' or EOF) is left in FINPUT for the
3723 caller to re-read. */
3726 get_directive_line (finput)
3727 register FILE *finput;
3729 static char *directive_buffer = NULL;
3730 static unsigned buffer_length = 0;
3732 register char *buffer_limit;
3733 register int looking_for = 0;
3734 register int char_escaped = 0;
3736 if (buffer_length == 0)
3738 directive_buffer = (char *)xmalloc (128);
3739 buffer_length = 128;
3742 buffer_limit = &directive_buffer[buffer_length];
3744 for (p = directive_buffer; ; )
3748 /* Make buffer bigger if it is full. */
3749 if (p >= buffer_limit)
3751 register unsigned bytes_used = (p - directive_buffer);
3755 = (char *)xrealloc (directive_buffer, buffer_length);
3756 p = &directive_buffer[bytes_used];
3757 buffer_limit = &directive_buffer[buffer_length];
3762 /* Discard initial whitespace. */
3763 if ((c == ' ' || c == '\t') && p == directive_buffer)
3766 /* Detect the end of the directive. */
3767 if (looking_for == 0
3768 && (c == '\n' || c == EOF))
3777 return directive_buffer;
3779 /* Handle string and character constant syntax. */
3782 if (looking_for == c && !char_escaped)
3783 looking_for = 0; /* Found terminator... stop looking. */
3786 if (c == '\'' || c == '"')
3787 looking_for = c; /* Don't stop buffering until we see another
3788 one of these (or an EOF). */
3790 /* Handle backslash. */
3791 char_escaped = (c == '\\' && ! char_escaped);
3794 #endif /* USE_CPPLIB */
3796 /* Make a variant type in the proper way for C/C++, propagating qualifiers
3797 down to the element type of an array. */
3800 c_build_qualified_type (type, type_quals)
3804 /* A restrict-qualified pointer type must be a pointer to object or
3805 incomplete type. Note that the use of POINTER_TYPE_P also allows
3806 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
3807 the C++ front-end also use POINTER_TYPE for pointer-to-member
3808 values, so even though it should be illegal to use `restrict'
3809 with such an entity we don't flag that here. Thus, special case
3810 code for that case is required in the C++ front-end. */
3811 if ((type_quals & TYPE_QUAL_RESTRICT)
3812 && (!POINTER_TYPE_P (type)
3813 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
3815 error ("invalid use of `restrict'");
3816 type_quals &= ~TYPE_QUAL_RESTRICT;
3819 if (TREE_CODE (type) == ARRAY_TYPE)
3820 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
3822 TYPE_DOMAIN (type));
3823 return build_qualified_type (type, type_quals);
3826 /* Apply the TYPE_QUALS to the new DECL. */
3829 c_apply_type_quals_to_decl (type_quals, decl)
3833 if ((type_quals & TYPE_QUAL_CONST)
3834 || (TREE_TYPE (decl)
3835 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
3836 TREE_READONLY (decl) = 1;
3837 if (type_quals & TYPE_QUAL_VOLATILE)
3839 TREE_SIDE_EFFECTS (decl) = 1;
3840 TREE_THIS_VOLATILE (decl) = 1;
3842 if (type_quals & TYPE_QUAL_RESTRICT)
3844 if (!TREE_TYPE (decl)
3845 || !POINTER_TYPE_P (TREE_TYPE (decl))
3846 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
3847 error ("invalid use of `restrict'");
3848 else if (flag_strict_aliasing)
3850 /* No two restricted pointers can point at the same thing.
3851 However, a restricted pointer can point at the same thing
3852 as an unrestricted pointer, if that unrestricted pointer
3853 is based on the restricted pointer. So, we make the
3854 alias set for the restricted pointer a subset of the
3855 alias set for the type pointed to by the type of the
3858 HOST_WIDE_INT pointed_to_alias_set
3859 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
3861 if (pointed_to_alias_set == 0)
3862 /* It's not legal to make a subset of alias set zero. */
3866 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
3867 record_alias_subset (pointed_to_alias_set,
3868 DECL_POINTER_ALIAS_SET (decl));
3875 /* Return the typed-based alias set for T, which may be an expression
3876 or a type. Return -1 if we don't do anything special. */
3879 lang_get_alias_set (t)
3884 /* Permit type-punning when accessing a union, provided the access
3885 is directly through the union. For example, this code does not
3886 permit taking the address of a union member and then storing
3887 through it. Even the type-punning allowed here is a GCC
3888 extension, albeit a common and useful one; the C standard says
3889 that such accesses have implementation-defined behavior. */
3891 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
3892 u = TREE_OPERAND (u, 0))
3893 if (TREE_CODE (u) == COMPONENT_REF
3894 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
3897 /* If this is a char *, the ANSI C standard says it can alias
3898 anything. Note that all references need do this. */
3899 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
3900 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
3901 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
3904 /* That's all the expressions we handle specially. */
3908 /* The C standard specifically allows aliasing between signed and
3909 unsigned variants of the same type. We treat the signed
3910 variant as canonical. */
3911 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
3913 tree t1 = signed_type (t);
3915 /* t1 == t can happen for boolean nodes which are always unsigned. */
3917 return get_alias_set (t1);
3919 else if (POINTER_TYPE_P (t))
3923 /* Unfortunately, there is no canonical form of a pointer type.
3924 In particular, if we have `typedef int I', then `int *', and
3925 `I *' are different types. So, we have to pick a canonical
3926 representative. We do this below.
3928 Technically, this approach is actually more conservative that
3929 it needs to be. In particular, `const int *' and `int *'
3930 chould be in different alias sets, according to the C and C++
3931 standard, since their types are not the same, and so,
3932 technically, an `int **' and `const int **' cannot point at
3935 But, the standard is wrong. In particular, this code is
3940 const int* const* cipp = &ip;
3942 And, it doesn't make sense for that to be legal unless you
3943 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
3944 the pointed-to types. This issue has been reported to the
3946 t1 = TYPE_MAIN_VARIANT (TREE_TYPE (t));
3947 t1 = ((TREE_CODE (t) == POINTER_TYPE)
3948 ? build_pointer_type (t1) : build_reference_type (t1));
3950 return get_alias_set (t1);
3952 /* It's not yet safe to use alias sets for classes in C++ because
3953 the TYPE_FIELDs list for a class doesn't mention base classes. */
3954 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
3960 /* Build tree nodes and builtin functions common to both C and C++ language
3962 CPLUS_MODE is nonzero if we are called from the C++ frontend, we generate
3963 some stricter prototypes in that case.
3964 NO_BUILTINS and NO_NONANSI_BUILTINS contain the respective values of
3965 the language frontend flags flag_no_builtin and
3966 flag_no_nonansi_builtin. */
3969 c_common_nodes_and_builtins (cplus_mode, no_builtins, no_nonansi_builtins)
3970 int cplus_mode, no_builtins, no_nonansi_builtins;
3973 tree memcpy_ftype, memset_ftype, strlen_ftype;
3974 tree bzero_ftype, bcmp_ftype;
3975 tree endlink, int_endlink, double_endlink, unsigned_endlink;
3976 tree sizetype_endlink;
3977 tree ptr_ftype, ptr_ftype_unsigned;
3978 tree void_ftype_any, void_ftype_int, int_ftype_any;
3979 tree double_ftype_double, double_ftype_double_double;
3980 tree float_ftype_float, ldouble_ftype_ldouble;
3981 tree int_ftype_cptr_cptr_sizet;
3982 tree int_ftype_string_string, string_ftype_ptr_ptr;
3983 tree long_ftype_long;
3984 /* Either char* or void*. */
3985 tree traditional_ptr_type_node;
3986 /* Either const char* or const void*. */
3987 tree traditional_cptr_type_node;
3988 tree traditional_len_type_node;
3989 tree traditional_len_endlink;
3990 tree va_list_ref_type_node;
3991 tree va_list_arg_type_node;
3993 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
3994 va_list_type_node));
3996 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
3997 ptrdiff_type_node));
3999 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
4002 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4004 va_list_arg_type_node = va_list_ref_type_node =
4005 build_pointer_type (TREE_TYPE (va_list_type_node));
4009 va_list_arg_type_node = va_list_type_node;
4010 va_list_ref_type_node = build_reference_type (va_list_type_node);
4013 endlink = void_list_node;
4014 int_endlink = tree_cons (NULL_TREE, integer_type_node, endlink);
4015 double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
4016 unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
4018 ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
4019 ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
4020 sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
4021 /* We realloc here because sizetype could be int or unsigned. S'ok. */
4022 ptr_ftype_sizetype = build_function_type (ptr_type_node, sizetype_endlink);
4024 int_ftype_any = build_function_type (integer_type_node, NULL_TREE);
4025 void_ftype_any = build_function_type (void_type_node, NULL_TREE);
4026 void_ftype = build_function_type (void_type_node, endlink);
4027 void_ftype_int = build_function_type (void_type_node, int_endlink);
4029 = build_function_type (void_type_node,
4030 tree_cons (NULL_TREE, ptr_type_node, endlink));
4033 = build_function_type (float_type_node,
4034 tree_cons (NULL_TREE, float_type_node, endlink));
4037 = build_function_type (double_type_node, double_endlink);
4039 ldouble_ftype_ldouble
4040 = build_function_type (long_double_type_node,
4041 tree_cons (NULL_TREE, long_double_type_node,
4044 double_ftype_double_double
4045 = build_function_type (double_type_node,
4046 tree_cons (NULL_TREE, double_type_node,
4050 = build_function_type (integer_type_node, int_endlink);
4053 = build_function_type (long_integer_type_node,
4054 tree_cons (NULL_TREE, long_integer_type_node,
4057 int_ftype_cptr_cptr_sizet
4058 = build_function_type (integer_type_node,
4059 tree_cons (NULL_TREE, const_ptr_type_node,
4060 tree_cons (NULL_TREE, const_ptr_type_node,
4061 tree_cons (NULL_TREE,
4065 void_zero_node = build_int_2 (0, 0);
4066 TREE_TYPE (void_zero_node) = void_type_node;
4068 /* Prototype for strcpy. */
4069 string_ftype_ptr_ptr
4070 = build_function_type (string_type_node,
4071 tree_cons (NULL_TREE, string_type_node,
4072 tree_cons (NULL_TREE,
4073 const_string_type_node,
4076 traditional_len_type_node = (flag_traditional && ! cplus_mode
4077 ? integer_type_node : sizetype);
4078 traditional_len_endlink = tree_cons (NULL_TREE, traditional_len_type_node,
4081 /* Prototype for strcmp. */
4082 int_ftype_string_string
4083 = build_function_type (integer_type_node,
4084 tree_cons (NULL_TREE, const_string_type_node,
4085 tree_cons (NULL_TREE,
4086 const_string_type_node,
4089 /* Prototype for strlen. */
4091 = build_function_type (traditional_len_type_node,
4092 tree_cons (NULL_TREE, const_string_type_node,
4095 traditional_ptr_type_node = (flag_traditional && ! cplus_mode
4096 ? string_type_node : ptr_type_node);
4097 traditional_cptr_type_node = (flag_traditional && ! cplus_mode
4098 ? const_string_type_node : const_ptr_type_node);
4100 /* Prototype for memcpy. */
4102 = build_function_type (traditional_ptr_type_node,
4103 tree_cons (NULL_TREE, ptr_type_node,
4104 tree_cons (NULL_TREE, const_ptr_type_node,
4105 sizetype_endlink)));
4107 /* Prototype for memset. */
4109 = build_function_type (traditional_ptr_type_node,
4110 tree_cons (NULL_TREE, ptr_type_node,
4111 tree_cons (NULL_TREE, integer_type_node,
4112 tree_cons (NULL_TREE,
4116 /* Prototype for bzero. */
4118 = build_function_type (void_type_node,
4119 tree_cons (NULL_TREE, traditional_ptr_type_node,
4120 traditional_len_endlink));
4122 /* Prototype for bcmp. */
4124 = build_function_type (integer_type_node,
4125 tree_cons (NULL_TREE, traditional_cptr_type_node,
4126 tree_cons (NULL_TREE,
4127 traditional_cptr_type_node,
4128 traditional_len_endlink)));
4130 builtin_function ("__builtin_constant_p", default_function_type,
4131 BUILT_IN_CONSTANT_P, BUILT_IN_NORMAL, NULL_PTR);
4133 builtin_function ("__builtin_return_address", ptr_ftype_unsigned,
4134 BUILT_IN_RETURN_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4136 builtin_function ("__builtin_frame_address", ptr_ftype_unsigned,
4137 BUILT_IN_FRAME_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4139 builtin_function ("__builtin_alloca", ptr_ftype_sizetype,
4140 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, "alloca");
4141 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS,
4142 BUILT_IN_NORMAL, NULL_PTR);
4143 /* Define alloca, ffs as builtins.
4144 Declare _exit just to mark it as volatile. */
4145 if (! no_builtins && ! no_nonansi_builtins)
4148 temp = builtin_function ("alloca", ptr_ftype_sizetype,
4149 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
4150 /* Suppress error if redefined as a non-function. */
4151 DECL_BUILT_IN_NONANSI (temp) = 1;
4153 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
4154 BUILT_IN_NORMAL, NULL_PTR);
4155 /* Suppress error if redefined as a non-function. */
4156 DECL_BUILT_IN_NONANSI (temp) = 1;
4157 temp = builtin_function ("_exit", void_ftype_int,
4158 0, NOT_BUILT_IN, NULL_PTR);
4159 TREE_THIS_VOLATILE (temp) = 1;
4160 TREE_SIDE_EFFECTS (temp) = 1;
4161 /* Suppress error if redefined as a non-function. */
4162 DECL_BUILT_IN_NONANSI (temp) = 1;
4164 /* The system prototypes for these functions have many
4165 variations, so don't specify parameters to avoid conflicts.
4166 The expand_* functions check the argument types anyway. */
4167 temp = builtin_function ("bzero", void_ftype_any,
4168 BUILT_IN_BZERO, BUILT_IN_NORMAL, NULL_PTR);
4169 DECL_BUILT_IN_NONANSI (temp) = 1;
4170 temp = builtin_function ("bcmp", int_ftype_any,
4171 BUILT_IN_BCMP, BUILT_IN_NORMAL, NULL_PTR);
4172 DECL_BUILT_IN_NONANSI (temp) = 1;
4175 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS,
4176 BUILT_IN_NORMAL, NULL_PTR);
4177 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
4178 BUILT_IN_NORMAL, NULL_PTR);
4179 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
4180 BUILT_IN_NORMAL, NULL_PTR);
4181 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4182 BUILT_IN_NORMAL, NULL_PTR);
4183 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
4184 BUILT_IN_NORMAL, NULL_PTR);
4185 builtin_function ("__builtin_saveregs", ptr_ftype, BUILT_IN_SAVEREGS,
4186 BUILT_IN_NORMAL, NULL_PTR);
4187 builtin_function ("__builtin_classify_type", default_function_type,
4188 BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
4189 builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
4190 BUILT_IN_NORMAL, NULL_PTR);
4191 builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
4192 BUILT_IN_NORMAL, NULL_PTR);
4193 builtin_function ("__builtin_setjmp",
4194 build_function_type (integer_type_node,
4195 tree_cons (NULL_TREE, ptr_type_node,
4197 BUILT_IN_SETJMP, BUILT_IN_NORMAL, NULL_PTR);
4198 builtin_function ("__builtin_longjmp",
4199 build_function_type (void_type_node,
4200 tree_cons (NULL_TREE, ptr_type_node,
4201 tree_cons (NULL_TREE,
4204 BUILT_IN_LONGJMP, BUILT_IN_NORMAL, NULL_PTR);
4205 builtin_function ("__builtin_trap", void_ftype, BUILT_IN_TRAP,
4206 BUILT_IN_NORMAL, NULL_PTR);
4208 /* ISO C99 IEEE Unordered compares. */
4209 builtin_function ("__builtin_isgreater", default_function_type,
4210 BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
4211 builtin_function ("__builtin_isgreaterequal", default_function_type,
4212 BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
4213 builtin_function ("__builtin_isless", default_function_type,
4214 BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
4215 builtin_function ("__builtin_islessequal", default_function_type,
4216 BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
4217 builtin_function ("__builtin_islessgreater", default_function_type,
4218 BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
4219 builtin_function ("__builtin_isunordered", default_function_type,
4220 BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
4222 /* Untyped call and return. */
4223 builtin_function ("__builtin_apply_args", ptr_ftype,
4224 BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
4226 temp = tree_cons (NULL_TREE,
4227 build_pointer_type (build_function_type (void_type_node,
4229 tree_cons (NULL_TREE,
4231 tree_cons (NULL_TREE,
4234 builtin_function ("__builtin_apply",
4235 build_function_type (ptr_type_node, temp),
4236 BUILT_IN_APPLY, BUILT_IN_NORMAL, NULL_PTR);
4237 builtin_function ("__builtin_return", void_ftype_ptr,
4238 BUILT_IN_RETURN, BUILT_IN_NORMAL, NULL_PTR);
4240 /* Support for varargs.h and stdarg.h. */
4241 builtin_function ("__builtin_varargs_start",
4242 build_function_type (void_type_node,
4243 tree_cons (NULL_TREE,
4244 va_list_ref_type_node,
4246 BUILT_IN_VARARGS_START, BUILT_IN_NORMAL, NULL_PTR);
4248 builtin_function ("__builtin_stdarg_start",
4249 build_function_type (void_type_node,
4250 tree_cons (NULL_TREE,
4251 va_list_ref_type_node,
4253 BUILT_IN_STDARG_START, BUILT_IN_NORMAL, NULL_PTR);
4255 builtin_function ("__builtin_va_end",
4256 build_function_type (void_type_node,
4257 tree_cons (NULL_TREE,
4258 va_list_ref_type_node,
4260 BUILT_IN_VA_END, BUILT_IN_NORMAL, NULL_PTR);
4262 builtin_function ("__builtin_va_copy",
4263 build_function_type (void_type_node,
4264 tree_cons (NULL_TREE,
4265 va_list_ref_type_node,
4266 tree_cons (NULL_TREE,
4267 va_list_arg_type_node,
4269 BUILT_IN_VA_COPY, BUILT_IN_NORMAL, NULL_PTR);
4271 /* ??? Ought to be `T __builtin_expect(T, T)' for any type T. */
4272 builtin_function ("__builtin_expect",
4273 build_function_type (long_integer_type_node,
4274 tree_cons (NULL_TREE,
4275 long_integer_type_node,
4276 tree_cons (NULL_TREE,
4277 long_integer_type_node,
4279 BUILT_IN_EXPECT, BUILT_IN_NORMAL, NULL_PTR);
4281 /* Currently under experimentation. */
4282 builtin_function ("__builtin_memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4283 BUILT_IN_NORMAL, "memcpy");
4284 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
4285 BUILT_IN_MEMCMP, BUILT_IN_NORMAL, "memcmp");
4286 builtin_function ("__builtin_memset", memset_ftype,
4287 BUILT_IN_MEMSET, BUILT_IN_NORMAL, "memset");
4288 builtin_function ("__builtin_bzero", bzero_ftype,
4289 BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
4290 builtin_function ("__builtin_bcmp", bcmp_ftype,
4291 BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");
4292 builtin_function ("__builtin_strcmp", int_ftype_string_string,
4293 BUILT_IN_STRCMP, BUILT_IN_NORMAL, "strcmp");
4294 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
4295 BUILT_IN_STRCPY, BUILT_IN_NORMAL, "strcpy");
4296 builtin_function ("__builtin_strlen", strlen_ftype,
4297 BUILT_IN_STRLEN, BUILT_IN_NORMAL, "strlen");
4298 builtin_function ("__builtin_sqrtf", float_ftype_float,
4299 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtf");
4300 builtin_function ("__builtin_fsqrt", double_ftype_double,
4301 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrt");
4302 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
4303 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtl");
4304 builtin_function ("__builtin_sinf", float_ftype_float,
4305 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinf");
4306 builtin_function ("__builtin_sin", double_ftype_double,
4307 BUILT_IN_SIN, BUILT_IN_NORMAL, "sin");
4308 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
4309 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinl");
4310 builtin_function ("__builtin_cosf", float_ftype_float,
4311 BUILT_IN_COS, BUILT_IN_NORMAL, "cosf");
4312 builtin_function ("__builtin_cos", double_ftype_double,
4313 BUILT_IN_COS, BUILT_IN_NORMAL, "cos");
4314 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
4315 BUILT_IN_COS, BUILT_IN_NORMAL, "cosl");
4316 /* We declare these without argument so that the initial declaration
4317 for these identifiers is a builtin. That allows us to redeclare
4318 them later with argument without worrying about the explicit
4319 declarations in stdio.h being taken as the initial declaration.
4320 Also, save the _DECL for these so we can use them later. */
4321 built_in_decls[BUILT_IN_FPUTC] =
4322 builtin_function ("__builtin_fputc", int_ftype_any,
4323 BUILT_IN_FPUTC, BUILT_IN_NORMAL, "fputc");
4324 built_in_decls[BUILT_IN_FPUTS] =
4325 builtin_function ("__builtin_fputs", int_ftype_any,
4326 BUILT_IN_FPUTS, BUILT_IN_NORMAL, "fputs");
4330 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS,
4331 BUILT_IN_NORMAL, NULL_PTR);
4332 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS,
4333 BUILT_IN_NORMAL, NULL_PTR);
4334 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS,
4335 BUILT_IN_NORMAL, NULL_PTR);
4336 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
4337 BUILT_IN_NORMAL, NULL_PTR);
4338 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS,
4339 BUILT_IN_NORMAL, NULL_PTR);
4340 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
4341 BUILT_IN_NORMAL, NULL_PTR);
4342 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
4343 BUILT_IN_NORMAL, NULL_PTR);
4344 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET,
4345 BUILT_IN_NORMAL, NULL_PTR);
4346 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
4347 BUILT_IN_NORMAL, NULL_PTR);
4348 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
4349 BUILT_IN_NORMAL, NULL_PTR);
4350 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN,
4351 BUILT_IN_NORMAL, NULL_PTR);
4352 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT,
4353 BUILT_IN_NORMAL, NULL_PTR);
4354 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT,
4355 BUILT_IN_NORMAL, NULL_PTR);
4356 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
4357 BUILT_IN_NORMAL, NULL_PTR);
4358 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN,
4359 BUILT_IN_NORMAL, NULL_PTR);
4360 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN,
4361 BUILT_IN_NORMAL, NULL_PTR);
4362 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN,
4363 BUILT_IN_NORMAL, NULL_PTR);
4364 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS,
4365 BUILT_IN_NORMAL, NULL_PTR);
4366 builtin_function ("cos", double_ftype_double, BUILT_IN_COS,
4367 BUILT_IN_NORMAL, NULL_PTR);
4368 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS,
4369 BUILT_IN_NORMAL, NULL_PTR);
4370 /* We declare these without argument so that the initial
4371 declaration for these identifiers is a builtin. That allows
4372 us to redeclare them later with argument without worrying
4373 about the explicit declarations in stdio.h being taken as the
4374 initial declaration. */
4375 builtin_function ("fputc", int_ftype_any, BUILT_IN_FPUTC,
4376 BUILT_IN_NORMAL, NULL_PTR);
4377 builtin_function ("fputs", int_ftype_any, BUILT_IN_FPUTS,
4378 BUILT_IN_NORMAL, NULL_PTR);
4380 /* Declare these functions volatile
4381 to avoid spurious "control drops through" warnings. */
4382 temp = builtin_function ("abort", cplus_mode ? void_ftype : void_ftype_any,
4383 0, NOT_BUILT_IN, NULL_PTR);
4384 TREE_THIS_VOLATILE (temp) = 1;
4385 TREE_SIDE_EFFECTS (temp) = 1;
4387 #if 0 /* ??? The C++ frontend used to do this. */
4388 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4390 DECL_BUILT_IN_NONANSI (temp) = 1;
4392 temp = builtin_function ("exit",
4393 cplus_mode ? void_ftype_int : void_ftype_any,
4394 0, NOT_BUILT_IN, NULL_PTR);
4395 TREE_THIS_VOLATILE (temp) = 1;
4396 TREE_SIDE_EFFECTS (temp) = 1;
4398 #if 0 /* ??? The C++ frontend used to do this. */
4399 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
4401 DECL_BUILT_IN_NONANSI (temp) = 1;
4406 /* Support for these has not been written in either expand_builtin
4407 or build_function_call. */
4408 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV,
4409 BUILT_IN_NORMAL, NULL_PTR);
4410 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV,
4411 BUILT_IN_NORMAL, NULL_PTR);
4412 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
4413 BUILT_IN_NORMAL, NULL_PTR);
4414 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
4415 BUILT_IN_NORMAL, NULL_PTR);
4416 builtin_function ("__builtin_fmod", double_ftype_double_double,
4417 BUILT_IN_FMOD, BUILT_IN_NORMAL, NULL_PTR);
4418 builtin_function ("__builtin_frem", double_ftype_double_double,
4419 BUILT_IN_FREM, BUILT_IN_NORMAL, NULL_PTR);
4420 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
4421 BUILT_IN_NORMAL, NULL_PTR);
4422 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
4423 BUILT_IN_NORMAL, NULL_PTR);
4426 main_identifier_node = get_identifier ("main");
4428 /* ??? Perhaps there's a better place to do this. But it is related
4429 to __builtin_va_arg, so it isn't that off-the-wall. */
4430 lang_type_promotes_to = simple_type_promotes_to;
4434 build_va_arg (expr, type)
4437 return build1 (VA_ARG_EXPR, type, expr);
4440 /* Given a type, apply default promotions wrt unnamed function arguments
4441 and return the new type. Return NULL_TREE if no change. */
4442 /* ??? There is a function of the same name in the C++ front end that
4443 does something similar, but is more thorough and does not return NULL
4444 if no change. We could perhaps share code, but it would make the
4445 self_promoting_type property harder to identify. */
4448 simple_type_promotes_to (type)
4451 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4452 return double_type_node;
4454 if (C_PROMOTING_INTEGER_TYPE_P (type))
4456 /* Traditionally, unsignedness is preserved in default promotions.
4457 Also preserve unsignedness if not really getting any wider. */
4458 if (TREE_UNSIGNED (type)
4459 && (flag_traditional
4460 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
4461 return unsigned_type_node;
4462 return integer_type_node;
4468 /* Return 1 if PARMS specifies a fixed number of parameters
4469 and none of their types is affected by default promotions. */
4472 self_promoting_args_p (parms)
4476 for (t = parms; t; t = TREE_CHAIN (t))
4478 register tree type = TREE_VALUE (t);
4480 if (TREE_CHAIN (t) == 0 && type != void_type_node)
4486 if (TYPE_MAIN_VARIANT (type) == float_type_node)
4489 if (C_PROMOTING_INTEGER_TYPE_P (type))
4495 /* Recognize certain built-in functions so we can make tree-codes
4496 other than CALL_EXPR. We do this when it enables fold-const.c
4497 to do something useful. */
4498 /* ??? By rights this should go in builtins.c, but only C and C++
4499 implement build_{binary,unary}_op. Not exactly sure what bits
4500 of functionality are actually needed from those functions, or
4501 where the similar functionality exists in the other front ends. */
4504 expand_tree_builtin (function, params, coerced_params)
4505 tree function, params, coerced_params;
4507 enum tree_code code;
4509 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
4512 switch (DECL_FUNCTION_CODE (function))
4517 if (coerced_params == 0)
4518 return integer_zero_node;
4519 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
4521 case BUILT_IN_ISGREATER:
4522 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4528 case BUILT_IN_ISGREATEREQUAL:
4529 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4535 case BUILT_IN_ISLESS:
4536 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4542 case BUILT_IN_ISLESSEQUAL:
4543 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4549 case BUILT_IN_ISLESSGREATER:
4550 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4556 case BUILT_IN_ISUNORDERED:
4557 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
4558 return integer_zero_node;
4559 code = UNORDERED_EXPR;
4567 || TREE_CHAIN (params) == 0)
4569 error ("too few arguments to function `%s'",
4570 IDENTIFIER_POINTER (DECL_NAME (function)));
4571 return error_mark_node;
4573 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
4575 error ("too many arguments to function `%s'",
4576 IDENTIFIER_POINTER (DECL_NAME (function)));
4577 return error_mark_node;
4580 arg0 = TREE_VALUE (params);
4581 arg1 = TREE_VALUE (TREE_CHAIN (params));
4582 arg0 = build_binary_op (code, arg0, arg1, 0);
4583 if (code != UNORDERED_EXPR)
4584 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
4596 /* Returns non-zero if CODE is the code for a statement. */
4599 statement_code_p (code)
4600 enum tree_code code;
4623 if (lang_statement_code_p)
4624 return (*lang_statement_code_p) (code);
4629 /* Walk the statemen tree, rooted at *tp. Apply FUNC to all the
4630 sub-trees of *TP in a pre-order traversal. FUNC is called with the
4631 DATA and the address of each sub-tree. If FUNC returns a non-NULL
4632 value, the traversal is aborted, and the value returned by FUNC is
4633 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
4634 the node being visited are not walked.
4636 We don't need a without_duplicates variant of this one because the
4637 statement tree is a tree, not a graph. */
4640 walk_stmt_tree (tp, func, data)
4645 enum tree_code code;
4650 #define WALK_SUBTREE(NODE) \
4653 result = walk_stmt_tree (&(NODE), func, data); \
4659 /* Skip empty subtrees. */
4663 /* Skip subtrees below non-statement nodes. */
4664 if (!statement_code_p (TREE_CODE (*tp)))
4667 /* Call the function. */
4669 result = (*func) (tp, &walk_subtrees, data);
4671 /* If we found something, return it. */
4675 /* Even if we didn't, FUNC may have decided that there was nothing
4676 interesting below this point in the tree. */
4680 /* FUNC may have modified the tree, recheck that we're looking at a
4682 code = TREE_CODE (*tp);
4683 if (!statement_code_p (code))
4686 /* Walk over all the sub-trees of this operand. Statement nodes never
4687 contain RTL, and we needn't worry about TARGET_EXPRs. */
4688 len = TREE_CODE_LENGTH (code);
4690 /* Go through the subtrees. We need to do this in forward order so
4691 that the scope of a FOR_EXPR is handled properly. */
4692 for (i = 0; i < len; ++i)
4693 WALK_SUBTREE (TREE_OPERAND (*tp, i));
4695 /* Finally visit the chain. This can be tail-recursion optimized if
4696 we write it this way. */
4697 return walk_stmt_tree (&TREE_CHAIN (*tp), func, data);
4702 /* Used to compare case labels. K1 and K2 are actually tree nodes
4703 representing case labels, or NULL_TREE for a `default' label.
4704 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
4705 K2, and 0 if K1 and K2 are equal. */
4708 case_compare (k1, k2)
4712 /* Consider a NULL key (such as arises with a `default' label) to be
4713 smaller than anything else. */
4719 return tree_int_cst_compare ((tree) k1, (tree) k2);
4722 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
4723 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
4724 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
4725 case label was declared using the usual C/C++ syntax, rather than
4726 the GNU case range extension. CASES is a tree containing all the
4727 case ranges processed so far; COND is the condition for the
4728 switch-statement itself. Returns the CASE_LABEL created, or
4729 ERROR_MARK_NODE if no CASE_LABEL is created. */
4732 c_add_case_label (cases, cond, low_value, high_value)
4741 splay_tree_node node;
4743 /* Create the LABEL_DECL itself. */
4744 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
4745 DECL_CONTEXT (label) = current_function_decl;
4747 /* If there was an error processing the switch condition, bail now
4748 before we get more confused. */
4749 if (!cond || cond == error_mark_node)
4751 /* Add a label anyhow so that the back-end doesn't think that
4752 the beginning of the switch is unreachable. */
4754 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4755 return error_mark_node;
4758 if ((low_value && TREE_TYPE (low_value)
4759 && POINTER_TYPE_P (TREE_TYPE (low_value)))
4760 || (high_value && TREE_TYPE (high_value)
4761 && POINTER_TYPE_P (TREE_TYPE (high_value))))
4762 error ("pointers are not permitted as case values");
4764 /* Case ranges are a GNU extension. */
4765 if (high_value && pedantic)
4767 if (c_language == clk_cplusplus)
4768 pedwarn ("ISO C++ forbids range expressions in switch statements");
4770 pedwarn ("ISO C forbids range expressions in switch statements");
4773 type = TREE_TYPE (cond);
4776 low_value = check_case_value (low_value);
4777 low_value = convert_and_check (type, low_value);
4781 high_value = check_case_value (high_value);
4782 high_value = convert_and_check (type, high_value);
4785 /* If an error has occurred, bail out now. */
4786 if (low_value == error_mark_node || high_value == error_mark_node)
4789 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4790 return error_mark_node;
4793 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
4794 really a case range, even though it was written that way. Remove
4795 the HIGH_VALUE to simplify later processing. */
4796 if (tree_int_cst_equal (low_value, high_value))
4797 high_value = NULL_TREE;
4798 if (low_value && high_value
4799 && !tree_int_cst_lt (low_value, high_value))
4800 warning ("empty range specified");
4802 /* Look up the LOW_VALUE in the table of case labels we already
4804 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
4805 /* If there was not an exact match, check for overlapping ranges.
4806 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
4807 that's a `default' label and the only overlap is an exact match. */
4808 if (!node && (low_value || high_value))
4810 splay_tree_node low_bound;
4811 splay_tree_node high_bound;
4813 /* Even though there wasn't an exact match, there might be an
4814 overlap between this case range and another case range.
4815 Since we've (inductively) not allowed any overlapping case
4816 ranges, we simply need to find the greatest low case label
4817 that is smaller that LOW_VALUE, and the smallest low case
4818 label that is greater than LOW_VALUE. If there is an overlap
4819 it will occur in one of these two ranges. */
4820 low_bound = splay_tree_predecessor (cases,
4821 (splay_tree_key) low_value);
4822 high_bound = splay_tree_successor (cases,
4823 (splay_tree_key) low_value);
4825 /* Check to see if the LOW_BOUND overlaps. It is smaller than
4826 the LOW_VALUE, so there is no need to check unless the
4827 LOW_BOUND is in fact itself a case range. */
4829 && CASE_HIGH ((tree) low_bound->value)
4830 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
4833 /* Check to see if the HIGH_BOUND overlaps. The low end of that
4834 range is bigger than the low end of the current range, so we
4835 are only interested if the current range is a real range, and
4836 not an ordinary case label. */
4839 && (tree_int_cst_compare ((tree) high_bound->key,
4844 /* If there was an overlap, issue an error. */
4847 tree duplicate = CASE_LABEL_DECL ((tree) node->value);
4851 error ("duplicate (or overlapping) case value");
4852 error_with_decl (duplicate,
4853 "this is the first entry overlapping that value");
4857 error ("duplicate case value") ;
4858 error_with_decl (duplicate, "previously used here");
4862 error ("multiple default labels in one switch");
4863 error_with_decl (duplicate, "this is the first default label");
4866 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
4869 /* Add a CASE_LABEL to the statement-tree. */
4870 case_label = add_stmt (build_case_label (low_value, high_value, label));
4871 /* Register this case label in the splay tree. */
4872 splay_tree_insert (cases,
4873 (splay_tree_key) low_value,
4874 (splay_tree_value) case_label);
4879 /* Mark P (a stmt_tree) for GC. The use of a `void *' for the
4880 parameter allows this function to be used as a GC-marking
4887 stmt_tree st = (stmt_tree) p;
4889 ggc_mark_tree (st->x_last_stmt);
4890 ggc_mark_tree (st->x_last_expr_type);
4893 /* Mark LD for GC. */
4896 c_mark_lang_decl (c)
4897 struct c_lang_decl *c;
4899 ggc_mark_tree (c->saved_tree);
4902 /* Mark F for GC. */
4905 mark_c_language_function (f)
4906 struct language_function *f;
4911 mark_stmt_tree (&f->x_stmt_tree);
4912 ggc_mark_tree (f->x_scope_stmt_stack);
4915 /* Hook used by expand_expr to expand language-specific tree codes. */
4918 c_expand_expr (exp, target, tmode, modifier)
4921 enum machine_mode tmode;
4922 enum expand_modifier modifier;
4924 switch (TREE_CODE (exp))
4931 /* Since expand_expr_stmt calls free_temp_slots after every
4932 expression statement, we must call push_temp_slots here.
4933 Otherwise, any temporaries in use now would be considered
4934 out-of-scope after the first EXPR_STMT from within the
4937 rtl_expr = expand_start_stmt_expr ();
4938 expand_stmt (STMT_EXPR_STMT (exp));
4939 expand_end_stmt_expr (rtl_expr);
4940 result = expand_expr (rtl_expr, target, tmode, modifier);
4954 /* Hook used by safe_from_p to handle language-specific tree codes. */
4957 c_safe_from_p (target, exp)
4961 /* We can see statements here when processing the body of a
4962 statement-expression. For a declaration statement declaring a
4963 variable, look at the variable's initializer. */
4964 if (TREE_CODE (exp) == DECL_STMT)
4966 tree decl = DECL_STMT_DECL (exp);
4968 if (TREE_CODE (decl) == VAR_DECL
4969 && DECL_INITIAL (decl)
4970 && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0))
4974 /* For any statement, we must follow the statement-chain. */
4975 if (statement_code_p (TREE_CODE (exp)) && TREE_CHAIN (exp))
4976 return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0);
4978 /* Assume everything else is safe. */
4982 /* Tree code classes. */
4984 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
4986 static char c_tree_code_type[] = {
4988 #include "c-common.def"
4992 /* Table indexed by tree code giving number of expression
4993 operands beyond the fixed part of the node structure.
4994 Not used for types or decls. */
4996 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
4998 static int c_tree_code_length[] = {
5000 #include "c-common.def"
5004 /* Names of tree components.
5005 Used for printing out the tree and error messages. */
5006 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
5008 static const char *c_tree_code_name[] = {
5010 #include "c-common.def"
5014 /* Adds the tree codes specific to the C front end to the list of all
5020 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
5022 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
5023 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
5025 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
5026 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
5028 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));