1 /* Subroutines shared by all languages that are variants of C.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
35 #include "diagnostic.h"
42 #undef WCHAR_TYPE_SIZE
43 #define WCHAR_TYPE_SIZE TYPE_PRECISION (wchar_type_node)
45 /* The following symbols are subsumed in the c_global_trees array, and
46 listed here individually for documentation purposes.
48 INTEGER_TYPE and REAL_TYPE nodes for the standard data types.
50 tree short_integer_type_node;
51 tree long_integer_type_node;
52 tree long_long_integer_type_node;
54 tree short_unsigned_type_node;
55 tree long_unsigned_type_node;
56 tree long_long_unsigned_type_node;
58 tree boolean_type_node;
59 tree boolean_false_node;
60 tree boolean_true_node;
62 tree ptrdiff_type_node;
64 tree unsigned_char_type_node;
65 tree signed_char_type_node;
67 tree signed_wchar_type_node;
68 tree unsigned_wchar_type_node;
71 tree double_type_node;
72 tree long_double_type_node;
74 tree complex_integer_type_node;
75 tree complex_float_type_node;
76 tree complex_double_type_node;
77 tree complex_long_double_type_node;
85 tree unsigned_intQI_type_node;
86 tree unsigned_intHI_type_node;
87 tree unsigned_intSI_type_node;
88 tree unsigned_intDI_type_node;
89 tree unsigned_intTI_type_node;
91 tree widest_integer_literal_type_node;
92 tree widest_unsigned_literal_type_node;
94 Nodes for types `void *' and `const void *'.
96 tree ptr_type_node, const_ptr_type_node;
98 Nodes for types `char *' and `const char *'.
100 tree string_type_node, const_string_type_node;
102 Type `char[SOMENUMBER]'.
103 Used when an array of char is needed and the size is irrelevant.
105 tree char_array_type_node;
107 Type `int[SOMENUMBER]' or something like it.
108 Used when an array of int needed and the size is irrelevant.
110 tree int_array_type_node;
112 Type `wchar_t[SOMENUMBER]' or something like it.
113 Used when a wide string literal is created.
115 tree wchar_array_type_node;
117 Type `int ()' -- used for implicit declaration of functions.
119 tree default_function_type;
121 Function types `int (int)', etc.
127 tree ptr_ftype_sizetype;
129 A VOID_TYPE node, packaged in a TREE_LIST.
133 The identifiers __FUNCTION__, __PRETTY_FUNCTION__, and __func__.
135 tree function_id_node;
136 tree pretty_function_id_node;
141 tree c_global_trees[CTI_MAX];
143 /* Nonzero means don't recognize the non-ANSI builtin functions. */
147 /* Nonzero means don't recognize the non-ANSI builtin functions.
150 int flag_no_nonansi_builtin;
152 /* Nonzero means warn about possible violations of sequence point rules. */
154 int warn_sequence_point;
156 /* The elements of `ridpointers' are identifier nodes for the reserved
157 type names and storage classes. It is indexed by a RID_... value. */
160 tree (*make_fname_decl) PARAMS ((tree, const char *, int));
162 /* If non-NULL, the address of a language-specific function that
163 returns 1 for language-specific statement codes. */
164 int (*lang_statement_code_p) PARAMS ((enum tree_code));
166 /* If non-NULL, the address of a language-specific function that takes
167 any action required right before expand_function_end is called. */
168 void (*lang_expand_function_end) PARAMS ((void));
170 /* If this variable is defined to a non-NULL value, it will be called
171 after the file has been completely parsed. */
172 void (*back_end_hook) PARAMS ((tree));
174 /* Nonzero means the expression being parsed will never be evaluated.
175 This is a count, since unevaluated expressions can nest. */
178 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
179 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
180 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
181 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
182 A_NO_LIMIT_STACK, A_PURE};
184 enum format_type { printf_format_type, scanf_format_type,
185 strftime_format_type };
187 static void add_attribute PARAMS ((enum attrs, const char *,
189 static void init_attributes PARAMS ((void));
190 static void record_function_format PARAMS ((tree, tree, enum format_type,
192 static void record_international_format PARAMS ((tree, tree, int));
193 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
195 /* Keep a stack of if statements. We record the number of compound
196 statements seen up to the if keyword, as well as the line number
197 and file of the if. If a potentially ambiguous else is seen, that
198 fact is recorded; the warning is issued when we can be sure that
199 the enclosing if statement does not have an else branch. */
209 static if_elt *if_stack;
211 /* Amount of space in the if statement stack. */
212 static int if_stack_space = 0;
215 static int if_stack_pointer = 0;
217 /* Record the start of an if-then, and record the start of it
218 for ambiguous else detection. */
221 c_expand_start_cond (cond, compstmt_count)
227 /* Make sure there is enough space on the stack. */
228 if (if_stack_space == 0)
231 if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
233 else if (if_stack_space == if_stack_pointer)
235 if_stack_space += 10;
236 if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
239 if_stmt = build_stmt (IF_STMT, NULL_TREE, NULL_TREE, NULL_TREE);
240 IF_COND (if_stmt) = cond;
243 /* Record this if statement. */
244 if_stack[if_stack_pointer].compstmt_count = compstmt_count;
245 if_stack[if_stack_pointer].file = input_filename;
246 if_stack[if_stack_pointer].line = lineno;
247 if_stack[if_stack_pointer].needs_warning = 0;
248 if_stack[if_stack_pointer].if_stmt = if_stmt;
252 /* Called after the then-clause for an if-statement is processed. */
257 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
258 RECHAIN_STMTS (if_stmt, THEN_CLAUSE (if_stmt));
261 /* Record the end of an if-then. Optionally warn if a nested
262 if statement had an ambiguous else clause. */
268 if (if_stack[if_stack_pointer].needs_warning)
269 warning_with_file_and_line (if_stack[if_stack_pointer].file,
270 if_stack[if_stack_pointer].line,
271 "suggest explicit braces to avoid ambiguous `else'");
272 last_expr_type = NULL_TREE;
275 /* Called between the then-clause and the else-clause
276 of an if-then-else. */
279 c_expand_start_else ()
281 /* An ambiguous else warning must be generated for the enclosing if
282 statement, unless we see an else branch for that one, too. */
284 && if_stack_pointer > 1
285 && (if_stack[if_stack_pointer - 1].compstmt_count
286 == if_stack[if_stack_pointer - 2].compstmt_count))
287 if_stack[if_stack_pointer - 2].needs_warning = 1;
289 /* Even if a nested if statement had an else branch, it can't be
290 ambiguous if this one also has an else. So don't warn in that
291 case. Also don't warn for any if statements nested in this else. */
292 if_stack[if_stack_pointer - 1].needs_warning = 0;
293 if_stack[if_stack_pointer - 1].compstmt_count--;
296 /* Called after the else-clause for an if-statement is processed. */
301 tree if_stmt = if_stack[if_stack_pointer - 1].if_stmt;
302 RECHAIN_STMTS (if_stmt, ELSE_CLAUSE (if_stmt));
305 /* Make bindings for __FUNCTION__, __PRETTY_FUNCTION__, and __func__. */
308 declare_function_name ()
310 const char *name, *printable_name;
312 if (current_function_decl == NULL)
315 printable_name = "top level";
319 /* Allow functions to be nameless (such as artificial ones). */
320 if (DECL_NAME (current_function_decl))
321 name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
324 printable_name = (*decl_printable_name) (current_function_decl, 2);
326 /* ISO C99 defines __func__, which is a variable, not a string
327 constant, and which is not a defined symbol at file scope. */
328 (*make_fname_decl) (func_id_node, name, 0);
331 (*make_fname_decl) (function_id_node, name, 0);
332 (*make_fname_decl) (pretty_function_id_node, printable_name, 1);
335 /* Given a chain of STRING_CST nodes,
336 concatenate them into one STRING_CST
337 and give it a suitable array-of-chars data type. */
340 combine_strings (strings)
343 register tree value, t;
344 register int length = 1;
347 int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
349 const int nchars_max = flag_isoc99 ? 4095 : 509;
351 if (TREE_CHAIN (strings))
353 /* More than one in the chain, so concatenate. */
354 register char *p, *q;
356 /* Don't include the \0 at the end of each substring,
357 except for the last one.
358 Count wide strings and ordinary strings separately. */
359 for (t = strings; t; t = TREE_CHAIN (t))
361 if (TREE_TYPE (t) == wchar_array_type_node)
363 wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
367 length += (TREE_STRING_LENGTH (t) - 1);
370 /* If anything is wide, the non-wides will be converted,
371 which makes them take more space. */
373 length = length * wchar_bytes + wide_length;
375 p = ggc_alloc_string (NULL, length);
377 /* Copy the individual strings into the new combined string.
378 If the combined string is wide, convert the chars to ints
379 for any individual strings that are not wide. */
382 for (t = strings; t; t = TREE_CHAIN (t))
384 int len = (TREE_STRING_LENGTH (t)
385 - ((TREE_TYPE (t) == wchar_array_type_node)
387 if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
389 memcpy (q, TREE_STRING_POINTER (t), len);
395 for (i = 0; i < len; i++)
397 if (WCHAR_TYPE_SIZE == HOST_BITS_PER_SHORT)
398 ((short *) q)[i] = TREE_STRING_POINTER (t)[i];
400 ((int *) q)[i] = TREE_STRING_POINTER (t)[i];
402 q += len * wchar_bytes;
408 for (i = 0; i < wchar_bytes; i++)
414 value = make_node (STRING_CST);
415 TREE_STRING_POINTER (value) = p;
416 TREE_STRING_LENGTH (value) = length;
421 length = TREE_STRING_LENGTH (value);
422 if (TREE_TYPE (value) == wchar_array_type_node)
426 /* Compute the number of elements, for the array type. */
427 nchars = wide_flag ? length / wchar_bytes : length;
429 if (pedantic && nchars > nchars_max)
430 pedwarn ("string length `%d' is greater than the minimum length `%d' ISO C%d is required to support",
431 nchars, nchars_max, flag_isoc99 ? 99 : 89);
433 /* Create the array type for the string constant.
434 -Wwrite-strings says make the string constant an array of const char
435 so that copying it to a non-const pointer will get a warning.
436 For C++, this is the standard behavior. */
437 if (flag_const_strings
438 && (! flag_traditional && ! flag_writable_strings))
441 = build_type_variant (wide_flag ? wchar_type_node : char_type_node,
444 = build_array_type (elements,
445 build_index_type (build_int_2 (nchars - 1, 0)));
449 = build_array_type (wide_flag ? wchar_type_node : char_type_node,
450 build_index_type (build_int_2 (nchars - 1, 0)));
452 TREE_CONSTANT (value) = 1;
453 TREE_READONLY (value) = ! flag_writable_strings;
454 TREE_STATIC (value) = 1;
458 /* To speed up processing of attributes, we maintain an array of
459 IDENTIFIER_NODES and the corresponding attribute types. */
461 /* Array to hold attribute information. */
463 static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
465 static int attrtab_idx = 0;
467 /* Add an entry to the attribute table above. */
470 add_attribute (id, string, min_len, max_len, decl_req)
473 int min_len, max_len;
478 attrtab[attrtab_idx].id = id;
479 attrtab[attrtab_idx].name = get_identifier (string);
480 attrtab[attrtab_idx].min = min_len;
481 attrtab[attrtab_idx].max = max_len;
482 attrtab[attrtab_idx++].decl_req = decl_req;
484 sprintf (buf, "__%s__", string);
486 attrtab[attrtab_idx].id = id;
487 attrtab[attrtab_idx].name = get_identifier (buf);
488 attrtab[attrtab_idx].min = min_len;
489 attrtab[attrtab_idx].max = max_len;
490 attrtab[attrtab_idx++].decl_req = decl_req;
493 /* Initialize attribute table. */
498 add_attribute (A_PACKED, "packed", 0, 0, 0);
499 add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
500 add_attribute (A_COMMON, "common", 0, 0, 1);
501 add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
502 add_attribute (A_NORETURN, "volatile", 0, 0, 1);
503 add_attribute (A_UNUSED, "unused", 0, 0, 0);
504 add_attribute (A_CONST, "const", 0, 0, 1);
505 add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
506 add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
507 add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
508 add_attribute (A_MODE, "mode", 1, 1, 1);
509 add_attribute (A_SECTION, "section", 1, 1, 1);
510 add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
511 add_attribute (A_FORMAT, "format", 3, 3, 1);
512 add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
513 add_attribute (A_WEAK, "weak", 0, 0, 1);
514 add_attribute (A_ALIAS, "alias", 1, 1, 1);
515 add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
516 add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
517 add_attribute (A_MALLOC, "malloc", 0, 0, 1);
518 add_attribute (A_NO_LIMIT_STACK, "no_stack_limit", 0, 0, 1);
519 add_attribute (A_PURE, "pure", 0, 0, 1);
522 /* Default implementation of valid_lang_attribute, below. By default, there
523 are no language-specific attributes. */
526 default_valid_lang_attribute (attr_name, attr_args, decl, type)
527 tree attr_name ATTRIBUTE_UNUSED;
528 tree attr_args ATTRIBUTE_UNUSED;
529 tree decl ATTRIBUTE_UNUSED;
530 tree type ATTRIBUTE_UNUSED;
535 /* Return a 1 if ATTR_NAME and ATTR_ARGS denote a valid language-specific
536 attribute for either declaration DECL or type TYPE and 0 otherwise. */
538 int (*valid_lang_attribute) PARAMS ((tree, tree, tree, tree))
539 = default_valid_lang_attribute;
541 /* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
542 and install them in NODE, which is either a DECL (including a TYPE_DECL)
543 or a TYPE. PREFIX_ATTRIBUTES can appear after the declaration specifiers
544 and declaration modifiers but before the declaration proper. */
547 decl_attributes (node, attributes, prefix_attributes)
548 tree node, attributes, prefix_attributes;
550 tree decl = 0, type = 0;
554 if (attrtab_idx == 0)
560 type = TREE_TYPE (decl);
561 is_type = TREE_CODE (node) == TYPE_DECL;
563 else if (TYPE_P (node))
564 type = node, is_type = 1;
566 #ifdef PRAGMA_INSERT_ATTRIBUTES
567 /* If the code in c-pragma.c wants to insert some attributes then
568 allow it to do so. Do this before allowing machine back ends to
569 insert attributes, so that they have the opportunity to override
570 anything done here. */
571 PRAGMA_INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
574 #ifdef INSERT_ATTRIBUTES
575 INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
578 attributes = chainon (prefix_attributes, attributes);
580 for (a = attributes; a; a = TREE_CHAIN (a))
582 tree name = TREE_PURPOSE (a);
583 tree args = TREE_VALUE (a);
587 for (i = 0; i < attrtab_idx; i++)
588 if (attrtab[i].name == name)
591 if (i == attrtab_idx)
593 if (! valid_machine_attribute (name, args, decl, type)
594 && ! (* valid_lang_attribute) (name, args, decl, type))
595 warning ("`%s' attribute directive ignored",
596 IDENTIFIER_POINTER (name));
598 type = TREE_TYPE (decl);
601 else if (attrtab[i].decl_req && decl == 0)
603 warning ("`%s' attribute does not apply to types",
604 IDENTIFIER_POINTER (name));
607 else if (list_length (args) < attrtab[i].min
608 || list_length (args) > attrtab[i].max)
610 error ("wrong number of arguments specified for `%s' attribute",
611 IDENTIFIER_POINTER (name));
620 TYPE_PACKED (type) = 1;
621 else if (TREE_CODE (decl) == FIELD_DECL)
622 DECL_PACKED (decl) = 1;
623 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
624 used for DECL_REGISTER. It wouldn't mean anything anyway. */
626 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
630 if (TREE_CODE (decl) == VAR_DECL)
631 DECL_COMMON (decl) = 0;
633 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
637 if (TREE_CODE (decl) == VAR_DECL)
638 DECL_COMMON (decl) = 1;
640 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
644 if (TREE_CODE (decl) == FUNCTION_DECL)
645 TREE_THIS_VOLATILE (decl) = 1;
646 else if (TREE_CODE (type) == POINTER_TYPE
647 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
648 TREE_TYPE (decl) = type
650 (build_type_variant (TREE_TYPE (type),
651 TREE_READONLY (TREE_TYPE (type)), 1));
653 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
657 if (TREE_CODE (decl) == FUNCTION_DECL)
658 DECL_IS_MALLOC (decl) = 1;
659 /* ??? TODO: Support types. */
661 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
667 TREE_USED (decl) = 1;
669 TREE_USED (type) = 1;
670 else if (TREE_CODE (decl) == PARM_DECL
671 || TREE_CODE (decl) == VAR_DECL
672 || TREE_CODE (decl) == FUNCTION_DECL
673 || TREE_CODE (decl) == LABEL_DECL)
674 TREE_USED (decl) = 1;
676 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
680 if (TREE_CODE (decl) == FUNCTION_DECL)
681 TREE_READONLY (decl) = 1;
682 else if (TREE_CODE (type) == POINTER_TYPE
683 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
684 TREE_TYPE (decl) = type
686 (build_type_variant (TREE_TYPE (type), 1,
687 TREE_THIS_VOLATILE (TREE_TYPE (type))));
689 warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
693 if (TREE_CODE (decl) == FUNCTION_DECL)
694 DECL_IS_PURE (decl) = 1;
695 /* ??? TODO: Support types. */
697 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
703 && TREE_CODE (type) == UNION_TYPE
705 || (TYPE_FIELDS (type) != 0
706 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
707 TYPE_TRANSPARENT_UNION (type) = 1;
708 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
709 && TREE_CODE (type) == UNION_TYPE
710 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
711 DECL_TRANSPARENT_UNION (decl) = 1;
713 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
717 if (TREE_CODE (decl) == FUNCTION_DECL
718 && TREE_CODE (type) == FUNCTION_TYPE
719 && decl_function_context (decl) == 0)
721 DECL_STATIC_CONSTRUCTOR (decl) = 1;
722 TREE_USED (decl) = 1;
725 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
729 if (TREE_CODE (decl) == FUNCTION_DECL
730 && TREE_CODE (type) == FUNCTION_TYPE
731 && decl_function_context (decl) == 0)
733 DECL_STATIC_DESTRUCTOR (decl) = 1;
734 TREE_USED (decl) = 1;
737 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
741 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
742 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
746 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
747 int len = strlen (p);
748 enum machine_mode mode = VOIDmode;
751 if (len > 4 && p[0] == '_' && p[1] == '_'
752 && p[len - 1] == '_' && p[len - 2] == '_')
754 char *newp = (char *) alloca (len - 1);
756 strcpy (newp, &p[2]);
757 newp[len - 4] = '\0';
761 /* Give this decl a type with the specified mode.
762 First check for the special modes. */
763 if (! strcmp (p, "byte"))
765 else if (!strcmp (p, "word"))
767 else if (! strcmp (p, "pointer"))
770 for (j = 0; j < NUM_MACHINE_MODES; j++)
771 if (!strcmp (p, GET_MODE_NAME (j)))
772 mode = (enum machine_mode) j;
774 if (mode == VOIDmode)
775 error ("unknown machine mode `%s'", p);
776 else if (0 == (typefm = type_for_mode (mode,
777 TREE_UNSIGNED (type))))
778 error ("no data type for mode `%s'", p);
781 if (TYPE_PRECISION (typefm) > (TREE_UNSIGNED (type)
782 ? TYPE_PRECISION(uintmax_type_node)
783 : TYPE_PRECISION(intmax_type_node))
785 pedwarn ("type with more precision than %s",
786 TREE_UNSIGNED (type) ? "uintmax_t" : "intmax_t");
787 TREE_TYPE (decl) = type = typefm;
788 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
789 layout_decl (decl, 0);
795 #ifdef ASM_OUTPUT_SECTION_NAME
796 if ((TREE_CODE (decl) == FUNCTION_DECL
797 || TREE_CODE (decl) == VAR_DECL)
798 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
800 if (TREE_CODE (decl) == VAR_DECL
801 && current_function_decl != NULL_TREE
802 && ! TREE_STATIC (decl))
803 error_with_decl (decl,
804 "section attribute cannot be specified for local variables");
805 /* The decl may have already been given a section attribute from
806 a previous declaration. Ensure they match. */
807 else if (DECL_SECTION_NAME (decl) != NULL_TREE
808 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
809 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
810 error_with_decl (node,
811 "section of `%s' conflicts with previous declaration");
813 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
816 error_with_decl (node,
817 "section attribute not allowed for `%s'");
819 error_with_decl (node,
820 "section attributes are not supported for this target");
827 = (args ? TREE_VALUE (args)
828 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
831 /* Strip any NOPs of any kind. */
832 while (TREE_CODE (align_expr) == NOP_EXPR
833 || TREE_CODE (align_expr) == CONVERT_EXPR
834 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
835 align_expr = TREE_OPERAND (align_expr, 0);
837 if (TREE_CODE (align_expr) != INTEGER_CST)
839 error ("requested alignment is not a constant");
843 if ((i = tree_log2 (align_expr)) == -1)
844 error ("requested alignment is not a power of 2");
845 else if (i > HOST_BITS_PER_INT - 2)
846 error ("requested alignment is too large");
849 /* If we have a TYPE_DECL, then copy the type, so that we
850 don't accidentally modify a builtin type. See pushdecl. */
851 if (decl && TREE_TYPE (decl) != error_mark_node
852 && DECL_ORIGINAL_TYPE (decl) == NULL_TREE)
854 tree tt = TREE_TYPE (decl);
855 DECL_ORIGINAL_TYPE (decl) = tt;
856 tt = build_type_copy (tt);
857 TYPE_NAME (tt) = decl;
858 TREE_USED (tt) = TREE_USED (decl);
859 TREE_TYPE (decl) = tt;
863 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
864 TYPE_USER_ALIGN (type) = 1;
866 else if (TREE_CODE (decl) != VAR_DECL
867 && TREE_CODE (decl) != FIELD_DECL)
868 error_with_decl (decl,
869 "alignment may not be specified for `%s'");
872 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
873 DECL_USER_ALIGN (decl) = 1;
880 tree format_type_id = TREE_VALUE (args);
881 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
882 tree first_arg_num_expr
883 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
884 unsigned HOST_WIDE_INT format_num, first_arg_num;
885 enum format_type format_type;
887 unsigned int arg_num;
889 if (TREE_CODE (decl) != FUNCTION_DECL)
891 error_with_decl (decl,
892 "argument format specified for non-function `%s'");
896 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
898 error ("unrecognized format specifier");
903 const char *p = IDENTIFIER_POINTER (format_type_id);
905 if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
906 format_type = printf_format_type;
907 else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
908 format_type = scanf_format_type;
909 else if (!strcmp (p, "strftime")
910 || !strcmp (p, "__strftime__"))
911 format_type = strftime_format_type;
914 warning ("`%s' is an unrecognized format function type", p);
919 /* Strip any conversions from the string index and first arg number
920 and verify they are constants. */
921 while (TREE_CODE (format_num_expr) == NOP_EXPR
922 || TREE_CODE (format_num_expr) == CONVERT_EXPR
923 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
924 format_num_expr = TREE_OPERAND (format_num_expr, 0);
926 while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
927 || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
928 || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
929 first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
931 if (TREE_CODE (format_num_expr) != INTEGER_CST
932 || TREE_INT_CST_HIGH (format_num_expr) != 0
933 || TREE_CODE (first_arg_num_expr) != INTEGER_CST
934 || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
936 error ("format string has invalid operand number");
940 format_num = TREE_INT_CST_LOW (format_num_expr);
941 first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
942 if (first_arg_num != 0 && first_arg_num <= format_num)
944 error ("format string arg follows the args to be formatted");
948 /* If a parameter list is specified, verify that the format_num
949 argument is actually a string, in case the format attribute
951 argument = TYPE_ARG_TYPES (type);
954 for (arg_num = 1; argument != 0 && arg_num != format_num;
955 ++arg_num, argument = TREE_CHAIN (argument))
959 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
960 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
963 error ("format string arg not a string type");
967 else if (first_arg_num != 0)
969 /* Verify that first_arg_num points to the last arg,
972 arg_num++, argument = TREE_CHAIN (argument);
974 if (arg_num != first_arg_num)
976 error ("args to be formatted is not '...'");
982 if (format_type == strftime_format_type && first_arg_num != 0)
984 error ("strftime formats cannot format arguments");
988 record_function_format (DECL_NAME (decl),
989 DECL_ASSEMBLER_NAME (decl),
990 format_type, format_num, first_arg_num);
996 tree format_num_expr = TREE_VALUE (args);
997 unsigned HOST_WIDE_INT format_num;
998 unsigned int arg_num;
1001 if (TREE_CODE (decl) != FUNCTION_DECL)
1003 error_with_decl (decl,
1004 "argument format specified for non-function `%s'");
1008 /* Strip any conversions from the first arg number and verify it
1010 while (TREE_CODE (format_num_expr) == NOP_EXPR
1011 || TREE_CODE (format_num_expr) == CONVERT_EXPR
1012 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
1013 format_num_expr = TREE_OPERAND (format_num_expr, 0);
1015 if (TREE_CODE (format_num_expr) != INTEGER_CST
1016 || TREE_INT_CST_HIGH (format_num_expr) != 0)
1018 error ("format string has invalid operand number");
1022 format_num = TREE_INT_CST_LOW (format_num_expr);
1024 /* If a parameter list is specified, verify that the format_num
1025 argument is actually a string, in case the format attribute
1027 argument = TYPE_ARG_TYPES (type);
1030 for (arg_num = 1; argument != 0 && arg_num != format_num;
1031 ++arg_num, argument = TREE_CHAIN (argument))
1035 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
1036 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
1039 error ("format string arg not a string type");
1044 if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
1045 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
1048 error ("function does not return string type");
1052 record_international_format (DECL_NAME (decl),
1053 DECL_ASSEMBLER_NAME (decl),
1059 declare_weak (decl);
1063 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
1064 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
1065 error_with_decl (decl,
1066 "`%s' defined both normally and as an alias");
1067 else if (decl_function_context (decl) == 0)
1071 id = TREE_VALUE (args);
1072 if (TREE_CODE (id) != STRING_CST)
1074 error ("alias arg not a string");
1077 id = get_identifier (TREE_STRING_POINTER (id));
1078 /* This counts as a use of the object pointed to. */
1081 if (TREE_CODE (decl) == FUNCTION_DECL)
1082 DECL_INITIAL (decl) = error_mark_node;
1084 DECL_EXTERNAL (decl) = 0;
1085 assemble_alias (decl, id);
1088 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1091 case A_NO_CHECK_MEMORY_USAGE:
1092 if (TREE_CODE (decl) != FUNCTION_DECL)
1094 error_with_decl (decl,
1095 "`%s' attribute applies only to functions",
1096 IDENTIFIER_POINTER (name));
1098 else if (DECL_INITIAL (decl))
1100 error_with_decl (decl,
1101 "can't set `%s' attribute after definition",
1102 IDENTIFIER_POINTER (name));
1105 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1108 case A_NO_INSTRUMENT_FUNCTION:
1109 if (TREE_CODE (decl) != FUNCTION_DECL)
1111 error_with_decl (decl,
1112 "`%s' attribute applies only to functions",
1113 IDENTIFIER_POINTER (name));
1115 else if (DECL_INITIAL (decl))
1117 error_with_decl (decl,
1118 "can't set `%s' attribute after definition",
1119 IDENTIFIER_POINTER (name));
1122 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1125 case A_NO_LIMIT_STACK:
1126 if (TREE_CODE (decl) != FUNCTION_DECL)
1128 error_with_decl (decl,
1129 "`%s' attribute applies only to functions",
1130 IDENTIFIER_POINTER (name));
1132 else if (DECL_INITIAL (decl))
1134 error_with_decl (decl,
1135 "can't set `%s' attribute after definition",
1136 IDENTIFIER_POINTER (name));
1139 DECL_NO_LIMIT_STACK (decl) = 1;
1145 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1146 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1148 The head of the declspec list is stored in DECLSPECS.
1149 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1151 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1152 the list elements. We drop the containing TREE_LIST nodes and link the
1153 resulting attributes together the way decl_attributes expects them. */
1156 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1158 tree *declspecs, *prefix_attributes;
1160 tree t, s, a, next, specs, attrs;
1162 /* This can happen after an __extension__ in pedantic mode. */
1163 if (specs_attrs != NULL_TREE
1164 && TREE_CODE (specs_attrs) == INTEGER_CST)
1166 *declspecs = NULL_TREE;
1167 *prefix_attributes = NULL_TREE;
1171 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1172 if (specs_attrs != NULL_TREE
1173 && TREE_CODE (specs_attrs) != TREE_LIST)
1175 *declspecs = specs_attrs;
1176 *prefix_attributes = NULL_TREE;
1180 /* Remember to keep the lists in the same order, element-wise. */
1182 specs = s = NULL_TREE;
1183 attrs = a = NULL_TREE;
1184 for (t = specs_attrs; t; t = next)
1186 next = TREE_CHAIN (t);
1187 /* Declspecs have a non-NULL TREE_VALUE. */
1188 if (TREE_VALUE (t) != NULL_TREE)
1190 if (specs == NULL_TREE)
1200 if (attrs == NULL_TREE)
1201 attrs = a = TREE_PURPOSE (t);
1204 TREE_CHAIN (a) = TREE_PURPOSE (t);
1205 a = TREE_PURPOSE (t);
1207 /* More attrs can be linked here, move A to the end. */
1208 while (TREE_CHAIN (a) != NULL_TREE)
1213 /* Terminate the lists. */
1215 TREE_CHAIN (s) = NULL_TREE;
1217 TREE_CHAIN (a) = NULL_TREE;
1221 *prefix_attributes = attrs;
1224 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1225 This function is used by the parser when a rule will accept attributes
1226 in a particular position, but we don't want to support that just yet.
1228 A warning is issued for every ignored attribute. */
1231 strip_attrs (specs_attrs)
1236 split_specs_attrs (specs_attrs, &specs, &attrs);
1240 warning ("`%s' attribute ignored",
1241 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1242 attrs = TREE_CHAIN (attrs);
1248 /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
1249 a parameter list. */
1251 /* The meaningfully distinct length modifiers for format checking recognised
1268 /* The standard versions in which various format features appeared. */
1269 enum format_std_version
1277 /* The C standard version C++ is treated as equivalent to
1278 or inheriting from, for the purpose of format features supported. */
1279 #define CPLUSPLUS_STD_VER STD_C89
1280 /* The C standard version we are checking formats against when pedantic. */
1281 #define C_STD_VER (c_language == clk_cplusplus \
1282 ? CPLUSPLUS_STD_VER \
1285 : (flag_isoc94 ? STD_C94 : STD_C89)))
1286 /* The name to give to the standard version we are warning about when
1287 pedantic. FEATURE_VER is the version in which the feature warned out
1288 appeared, which is higher than C_STD_VER. */
1289 #define C_STD_NAME(FEATURE_VER) (c_language == clk_cplusplus \
1291 : ((FEATURE_VER) == STD_EXT \
1295 /* Flags that may apply to a particular kind of format checked by GCC. */
1298 /* This format converts arguments of types determined by the
1300 FMT_FLAG_ARG_CONVERT = 1,
1301 /* The scanf allocation 'a' kludge applies to this format kind. */
1302 FMT_FLAG_SCANF_A_KLUDGE = 2,
1303 /* A % during parsing a specifier is allowed to be a modified % rather
1304 that indicating the format is broken and we are out-of-sync. */
1305 FMT_FLAG_FANCY_PERCENT_OK = 4,
1306 /* With $ operand numbers, it is OK to reference the same argument more
1308 FMT_FLAG_DOLLAR_MULTIPLE = 8
1309 /* Not included here: details of whether width or precision may occur
1310 (controlled by width_char and precision_char); details of whether
1311 '*' can be used for these (width_type and precision_type); details
1312 of whether length modifiers can occur (length_char_specs); details
1313 of when $ operand numbers are allowed (always, for the formats
1314 supported, if arguments are converted). */
1318 /* Structure describing a length modifier supported in format checking, and
1319 possibly a doubled version such as "hh". */
1322 /* Name of the single-character length modifier. */
1324 /* Index into a format_char_info.types array. */
1325 enum format_lengths index;
1326 /* Standard version this length appears in. */
1327 enum format_std_version std;
1328 /* Same, if the modifier can be repeated, or NULL if it can't. */
1329 const char *double_name;
1330 enum format_lengths double_index;
1331 enum format_std_version double_std;
1332 } format_length_info;
1335 /* Structure desribing the combination of a conversion specifier
1336 (or a set of specifiers which act identically) and a length modifier. */
1339 /* The standard version this combination of length and type appeared in.
1340 This is only relevant if greater than those for length and type
1341 individually; otherwise it is ignored. */
1342 enum format_std_version std;
1343 /* The name to use for the type, if different from that generated internally
1344 (e.g., "signed size_t"). */
1346 /* The type itself. */
1348 } format_type_detail;
1351 /* Macros to fill out tables of these. */
1352 #define BADLEN { 0, NULL, NULL }
1353 #define NOLENGTHS { BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }
1356 /* Structure desribing a format conversion specifier (or a set of specifiers
1357 which act identically), and the length modifiers used with it. */
1360 const char *format_chars;
1362 enum format_std_version std;
1363 /* Types accepted for each length modifier. */
1364 format_type_detail types[FMT_LEN_MAX];
1365 /* List of other modifier characters allowed with these specifiers.
1366 This lists flags, and additionally "w" for width, "p" for precision,
1367 "a" for scanf "a" allocation extension (not applicable in C99 mode),
1368 "*" for scanf suppression, and "E" and "O" for those strftime
1370 const char *flag_chars;
1371 /* List of additional flags describing these conversion specifiers.
1372 "c" for generic character pointers being allowed, "2" for strftime
1373 two digit year formats, "3" for strftime formats giving two digit
1374 years in some locales, "4" for "2" which becomes "3" with an "E" modifier,
1375 "o" if use of strftime "O" is a GNU extension beyond C99,
1376 "W" if the argument is a pointer which is dereferenced and written into,
1377 "i" for printf integer formats where the '0' flag is ignored with
1378 precision, and "[" for the starting character of a scanf scanset. */
1383 /* Structure describing a flag accepted by some kind of format. */
1386 /* The flag character in question (0 for end of array). */
1388 /* Zero if this entry describes the flag character in general, or a
1389 non-zero character that may be found in flags2 if it describes the
1390 flag when used with certain formats only. If the latter, only
1391 the first such entry found that applies to the current conversion
1392 specifier is used; the values of `name' and `long_name' it supplies
1393 will be used, if non-NULL and the standard version is higher than
1394 the unpredicated one, for any pedantic warning. For example, 'o'
1395 for strftime formats (meaning 'O' is an extension over C99). */
1397 /* The name to use for this flag in diagnostic messages. For example,
1398 N_("`0' flag"), N_("field width"). */
1400 /* Long name for this flag in diagnostic messages; currently only used for
1401 "ISO C does not support ...". For example, N_("the `I' printf flag"). */
1402 const char *long_name;
1403 /* The standard version in which it appeared. */
1404 enum format_std_version std;
1408 /* Structure describing a combination of flags that is bad for some kind
1412 /* The first flag character in question (0 for end of array). */
1414 /* The second flag character. */
1416 /* Non-zero if the message should say that the first flag is ignored with
1417 the second, zero if the combination should simply be objected to. */
1419 /* Zero if this entry applies whenever this flag combination occurs,
1420 a non-zero character from flags2 if it only applies in some
1421 circumstances (e.g. 'i' for printf formats ignoring 0 with precision). */
1426 /* Structure describing a particular kind of format processed by GCC. */
1429 /* The name of this kind of format, for use in diagnostics. */
1431 /* Specifications of the length modifiers accepted; possibly NULL. */
1432 const format_length_info *length_char_specs;
1433 /* Details of the conversion specification characters accepted. */
1434 const format_char_info *conversion_specs;
1435 /* String listing the flag characters that are accepted. */
1436 const char *flag_chars;
1437 /* String listing modifier characters (strftime) accepted. May be NULL. */
1438 const char *modifier_chars;
1439 /* Details of the flag characters, including pseudo-flags. */
1440 const format_flag_spec *flag_specs;
1441 /* Details of bad combinations of flags. */
1442 const format_flag_pair *bad_flag_pairs;
1443 /* Flags applicable to this kind of format. */
1445 /* Flag character to treat a width as, or 0 if width not used. */
1447 /* Flag character to treat a precision as, or 0 if precision not used. */
1449 /* If a flag character has the effect of suppressing the conversion of
1450 an argument ('*' in scanf), that flag character, otherwise 0. */
1451 int suppression_char;
1452 /* Flag character to treat a length modifier as (ignored if length
1453 modifiers not used). Need not be placed in flag_chars for conversion
1454 specifiers, but is used to check for bad combinations such as length
1455 modifier with assignment suppression in scanf. */
1456 int length_code_char;
1457 /* Pointer to type of argument expected if '*' is used for a width,
1458 or NULL if '*' not used for widths. */
1460 /* Pointer to type of argument expected if '*' is used for a precision,
1461 or NULL if '*' not used for precisions. */
1462 tree *precision_type;
1466 /* Structure describing details of a type expected in format checking,
1467 and the type to check against it. */
1468 typedef struct format_wanted_type
1470 /* The type wanted. */
1472 /* The name of this type to use in diagnostics. */
1473 const char *wanted_type_name;
1474 /* The level of indirection through pointers at which this type occurs. */
1476 /* Whether, when pointer_count is 1, to allow any character type when
1477 pedantic, rather than just the character or void type specified. */
1478 int char_lenient_flag;
1479 /* Whether the argument, dereferenced once, is written into and so the
1480 argument must not be a pointer to a const-qualified type. */
1481 int writing_in_flag;
1482 /* If warnings should be of the form "field precision is not type int",
1483 the name to use (in this case "field precision"), otherwise NULL,
1484 for "%s format, %s arg" type messages. If (in an extension), this
1485 is a pointer type, wanted_type_name should be set to include the
1486 terminating '*' characters of the type name to give a correct
1489 /* The actual parameter to check against the wanted type. */
1491 /* The argument number of that parameter. */
1493 /* The next type to check for this format conversion, or NULL if none. */
1494 struct format_wanted_type *next;
1495 } format_wanted_type;
1498 static const format_length_info printf_length_specs[] =
1500 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1501 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1502 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1503 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1504 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1505 { "Z", FMT_LEN_z, STD_EXT, NULL, 0, 0 },
1506 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1507 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1508 { NULL, 0, 0, NULL, 0, 0 }
1512 /* This differs from printf_length_specs only in that "Z" is not accepted. */
1513 static const format_length_info scanf_length_specs[] =
1515 { "h", FMT_LEN_h, STD_C89, "hh", FMT_LEN_hh, STD_C99 },
1516 { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C99 },
1517 { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
1518 { "L", FMT_LEN_L, STD_C89, NULL, 0, 0 },
1519 { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
1520 { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
1521 { "j", FMT_LEN_j, STD_C99, NULL, 0, 0 },
1522 { NULL, 0, 0, NULL, 0, 0 }
1526 static const format_flag_spec printf_flag_specs[] =
1528 { ' ', 0, N_("` ' flag"), N_("the ` ' printf flag"), STD_C89 },
1529 { '+', 0, N_("`+' flag"), N_("the `+' printf flag"), STD_C89 },
1530 { '#', 0, N_("`#' flag"), N_("the `#' printf flag"), STD_C89 },
1531 { '0', 0, N_("`0' flag"), N_("the `0' printf flag"), STD_C89 },
1532 { '-', 0, N_("`-' flag"), N_("the `-' printf flag"), STD_C89 },
1533 { '\'', 0, N_("`'' flag"), N_("the `'' printf flag"), STD_EXT },
1534 { 'I', 0, N_("`I' flag"), N_("the `I' printf flag"), STD_EXT },
1535 { 'w', 0, N_("field width"), N_("field width in printf format"), STD_C89 },
1536 { 'p', 0, N_("precision"), N_("precision in printf format"), STD_C89 },
1537 { 'L', 0, N_("length modifier"), N_("length modifier in printf format"), STD_C89 },
1538 { 0, 0, NULL, NULL, 0 }
1542 static const format_flag_pair printf_flag_pairs[] =
1546 { '0', 'p', 1, 'i' },
1551 static const format_flag_spec scanf_flag_specs[] =
1553 { '*', 0, N_("assignment suppression"), N_("assignment suppression"), STD_C89 },
1554 { 'a', 0, N_("`a' flag"), N_("the `a' scanf flag"), STD_EXT },
1555 { 'w', 0, N_("field width"), N_("field width in scanf format"), STD_C89 },
1556 { 'L', 0, N_("length modifier"), N_("length modifier in scanf format"), STD_C89 },
1557 { '\'', 0, N_("`'' flag"), N_("the `'' scanf flag"), STD_EXT },
1558 { 'I', 0, N_("`I' flag"), N_("the `I' scanf flag"), STD_EXT },
1559 { 0, 0, NULL, NULL, 0 }
1563 static const format_flag_pair scanf_flag_pairs[] =
1570 static const format_flag_spec strftime_flag_specs[] =
1572 { '_', 0, N_("`_' flag"), N_("the `_' strftime flag"), STD_EXT },
1573 { '-', 0, N_("`-' flag"), N_("the `-' strftime flag"), STD_EXT },
1574 { '0', 0, N_("`0' flag"), N_("the `0' strftime flag"), STD_EXT },
1575 { '^', 0, N_("`^' flag"), N_("the `^' strftime flag"), STD_EXT },
1576 { '#', 0, N_("`#' flag"), N_("the `#' strftime flag"), STD_EXT },
1577 { 'w', 0, N_("field width"), N_("field width in strftime format"), STD_EXT },
1578 { 'E', 0, N_("`E' modifier"), N_("the `E' strftime modifier"), STD_C99 },
1579 { 'O', 0, N_("`O' modifier"), N_("the `O' strftime modifier"), STD_C99 },
1580 { 'O', 'o', NULL, N_("the `O' modifier"), STD_EXT },
1581 { 0, 0, NULL, NULL, 0 }
1585 static const format_flag_pair strftime_flag_pairs[] =
1596 #define T_I &integer_type_node
1597 #define T89_I { STD_C89, NULL, T_I }
1598 #define T99_I { STD_C99, NULL, T_I }
1599 #define T_L &long_integer_type_node
1600 #define T89_L { STD_C89, NULL, T_L }
1601 #define T_LL &long_long_integer_type_node
1602 #define T99_LL { STD_C99, NULL, T_LL }
1603 #define TEX_LL { STD_EXT, NULL, T_LL }
1604 #define T_S &short_integer_type_node
1605 #define T89_S { STD_C89, NULL, T_S }
1606 #define T_UI &unsigned_type_node
1607 #define T89_UI { STD_C89, NULL, T_UI }
1608 #define T99_UI { STD_C99, NULL, T_UI }
1609 #define T_UL &long_unsigned_type_node
1610 #define T89_UL { STD_C89, NULL, T_UL }
1611 #define T_ULL &long_long_unsigned_type_node
1612 #define T99_ULL { STD_C99, NULL, T_ULL }
1613 #define TEX_ULL { STD_EXT, NULL, T_ULL }
1614 #define T_US &short_unsigned_type_node
1615 #define T89_US { STD_C89, NULL, T_US }
1616 #define T_F &float_type_node
1617 #define T89_F { STD_C89, NULL, T_F }
1618 #define T99_F { STD_C99, NULL, T_F }
1619 #define T_D &double_type_node
1620 #define T89_D { STD_C89, NULL, T_D }
1621 #define T99_D { STD_C99, NULL, T_D }
1622 #define T_LD &long_double_type_node
1623 #define T89_LD { STD_C89, NULL, T_LD }
1624 #define T99_LD { STD_C99, NULL, T_LD }
1625 #define T_C &char_type_node
1626 #define T89_C { STD_C89, NULL, T_C }
1627 #define T_SC &signed_char_type_node
1628 #define T99_SC { STD_C99, NULL, T_SC }
1629 #define T_UC &unsigned_char_type_node
1630 #define T99_UC { STD_C99, NULL, T_UC }
1631 #define T_V &void_type_node
1632 #define T89_V { STD_C89, NULL, T_V }
1633 #define T_W &wchar_type_node
1634 #define T94_W { STD_C94, "wchar_t", T_W }
1635 #define TEX_W { STD_EXT, "wchar_t", T_W }
1636 #define T_WI &wint_type_node
1637 #define T94_WI { STD_C94, "wint_t", T_WI }
1638 #define TEX_WI { STD_EXT, "wint_t", T_WI }
1639 #define T_ST &c_size_type_node
1640 #define T99_ST { STD_C99, "size_t", T_ST }
1641 #define T_SST &signed_size_type_node
1642 #define T99_SST { STD_C99, "signed size_t", T_SST }
1643 #define T_PD &ptrdiff_type_node
1644 #define T99_PD { STD_C99, "ptrdiff_t", T_PD }
1645 #define T_UPD &unsigned_ptrdiff_type_node
1646 #define T99_UPD { STD_C99, "unsigned ptrdiff_t", T_UPD }
1647 #define T_IM &intmax_type_node
1648 #define T99_IM { STD_C99, "intmax_t", T_IM }
1649 #define T_UIM &uintmax_type_node
1650 #define T99_UIM { STD_C99, "uintmax_t", T_UIM }
1652 static const format_char_info print_char_table[] =
1654 /* C89 conversion specifiers. */
1655 { "di", 0, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "-wp0 +'I", "i" },
1656 { "oxX", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0#", "i" },
1657 { "u", 0, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "-wp0'I", "i" },
1658 { "fgG", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
1659 { "eE", 0, STD_C89, { T89_D, BADLEN, BADLEN, T99_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
1660 { "c", 0, STD_C89, { T89_I, BADLEN, BADLEN, T94_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
1661 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "c" },
1662 { "p", 1, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "c" },
1663 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
1664 /* C99 conversion specifiers. */
1665 { "F", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#'", "" },
1666 { "aA", 0, STD_C99, { T99_D, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "-wp0 +#", "" },
1667 /* X/Open conversion specifiers. */
1668 { "C", 0, STD_EXT, { TEX_WI, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-w", "" },
1669 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
1670 /* GNU conversion specifiers. */
1671 { "m", 0, STD_EXT, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "-wp", "" },
1672 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1675 static const format_char_info scan_char_table[] =
1677 /* C89 conversion specifiers. */
1678 { "di", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, TEX_LL, T99_SST, T99_PD, T99_IM }, "*w'I", "W" },
1679 { "u", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w'I", "W" },
1680 { "oxX", 1, STD_C89, { T89_UI, T99_UC, T89_US, T89_UL, T99_ULL, TEX_ULL, T99_ST, T99_UPD, T99_UIM }, "*w", "W" },
1681 { "efgEG", 1, STD_C89, { T89_F, BADLEN, BADLEN, T89_D, BADLEN, T89_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
1682 { "c", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "cW" },
1683 { "s", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW" },
1684 { "[", 1, STD_C89, { T89_C, BADLEN, BADLEN, T94_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "cW[" },
1685 { "p", 2, STD_C89, { T89_V, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1686 { "n", 1, STD_C89, { T89_I, T99_SC, T89_S, T89_L, T99_LL, BADLEN, T99_SST, T99_PD, T99_IM }, "", "W" },
1687 /* C99 conversion specifiers. */
1688 { "FaA", 1, STD_C99, { T99_F, BADLEN, BADLEN, T99_D, BADLEN, T99_LD, BADLEN, BADLEN, BADLEN }, "*w'", "W" },
1689 /* X/Open conversion specifiers. */
1690 { "C", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*w", "W" },
1691 { "S", 1, STD_EXT, { TEX_W, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN, BADLEN }, "*aw", "W" },
1692 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1695 static format_char_info time_char_table[] =
1697 /* C89 conversion specifiers. */
1698 { "ABZab", 0, STD_C89, NOLENGTHS, "^#", "" },
1699 { "cx", 0, STD_C89, NOLENGTHS, "E", "3" },
1700 { "HIMSUWdmw", 0, STD_C89, NOLENGTHS, "-_0Ow", "" },
1701 { "j", 0, STD_C89, NOLENGTHS, "-_0Ow", "o" },
1702 { "p", 0, STD_C89, NOLENGTHS, "#", "" },
1703 { "X", 0, STD_C89, NOLENGTHS, "E", "" },
1704 { "y", 0, STD_C89, NOLENGTHS, "EO-_0w", "4" },
1705 { "Y", 0, STD_C89, NOLENGTHS, "-_0EOw", "o" },
1706 { "%", 0, STD_C89, NOLENGTHS, "", "" },
1707 /* C99 conversion specifiers. */
1708 { "C", 0, STD_C99, NOLENGTHS, "-_0EOw", "o" },
1709 { "D", 0, STD_C99, NOLENGTHS, "", "2" },
1710 { "eVu", 0, STD_C99, NOLENGTHS, "-_0Ow", "" },
1711 { "FRTnrt", 0, STD_C99, NOLENGTHS, "", "" },
1712 { "g", 0, STD_C99, NOLENGTHS, "O-_0w", "2o" },
1713 { "G", 0, STD_C99, NOLENGTHS, "-_0Ow", "o" },
1714 { "h", 0, STD_C99, NOLENGTHS, "^#", "" },
1715 { "z", 0, STD_C99, NOLENGTHS, "O", "o" },
1716 /* GNU conversion specifiers. */
1717 { "kls", 0, STD_EXT, NOLENGTHS, "-_0Ow", "" },
1718 { "P", 0, STD_EXT, NOLENGTHS, "", "" },
1719 { NULL, 0, 0, NOLENGTHS, NULL, NULL }
1723 /* This must be in the same order as enum format_type. */
1724 static const format_kind_info format_types[] =
1726 { "printf", printf_length_specs, print_char_table, " +#0-'I", NULL,
1727 printf_flag_specs, printf_flag_pairs,
1728 FMT_FLAG_ARG_CONVERT|FMT_FLAG_DOLLAR_MULTIPLE, 'w', 'p', 0, 'L',
1729 &integer_type_node, &integer_type_node
1731 { "scanf", scanf_length_specs, scan_char_table, "*'I", NULL,
1732 scanf_flag_specs, scanf_flag_pairs,
1733 FMT_FLAG_ARG_CONVERT|FMT_FLAG_SCANF_A_KLUDGE, 'w', 0, '*', 'L',
1736 { "strftime", NULL, time_char_table, "_-0^#", "EO",
1737 strftime_flag_specs, strftime_flag_pairs,
1738 FMT_FLAG_FANCY_PERCENT_OK, 'w', 0, 0, 0,
1744 typedef struct function_format_info
1746 struct function_format_info *next; /* next structure on the list */
1747 tree name; /* identifier such as "printf" */
1748 tree assembler_name; /* optional mangled identifier (for C++) */
1749 enum format_type format_type; /* type of format (printf, scanf, etc.) */
1750 int format_num; /* number of format argument */
1751 int first_arg_num; /* number of first arg (zero for varargs) */
1752 } function_format_info;
1754 static function_format_info *function_format_list = NULL;
1756 typedef struct international_format_info
1758 struct international_format_info *next; /* next structure on the list */
1759 tree name; /* identifier such as "gettext" */
1760 tree assembler_name; /* optional mangled identifier (for C++) */
1761 int format_num; /* number of format argument */
1762 } international_format_info;
1764 static international_format_info *international_format_list = NULL;
1766 /* Structure detailing the results of checking a format function call
1767 where the format expression may be a conditional expression with
1768 many leaves resulting from nested conditional expressions. */
1771 /* Number of leaves of the format argument that could not be checked
1772 as they were not string literals. */
1773 int number_non_literal;
1774 /* Number of leaves of the format argument that were null pointers or
1775 string literals, but had extra format arguments. */
1776 int number_extra_args;
1777 /* Number of leaves of the format argument that were null pointers or
1778 string literals, but had extra format arguments and used $ operand
1780 int number_dollar_extra_args;
1781 /* Number of leaves of the format argument that were wide string
1784 /* Number of leaves of the format argument that were empty strings. */
1786 /* Number of leaves of the format argument that were unterminated
1788 int number_unterminated;
1789 /* Number of leaves of the format argument that were not counted above. */
1791 } format_check_results;
1793 static void check_format_info PARAMS ((int *, function_format_info *, tree));
1794 static void check_format_info_recurse PARAMS ((int *, format_check_results *,
1795 function_format_info *, tree,
1797 static void check_format_info_main PARAMS ((int *, format_check_results *,
1798 function_format_info *,
1799 const char *, int, tree, int));
1800 static void status_warning PARAMS ((int *, const char *, ...))
1803 static void init_dollar_format_checking PARAMS ((int, tree));
1804 static int maybe_read_dollar_number PARAMS ((int *, const char **, int,
1806 const format_kind_info *));
1807 static void finish_dollar_format_checking PARAMS ((int *, format_check_results *));
1809 static const format_flag_spec *get_flag_spec PARAMS ((const format_flag_spec *,
1810 int, const char *));
1812 static void check_format_types PARAMS ((int *, format_wanted_type *));
1813 static int is_valid_printf_arglist PARAMS ((tree));
1814 static rtx c_expand_builtin PARAMS ((tree, rtx, enum machine_mode, enum expand_modifier));
1815 static rtx c_expand_builtin_printf PARAMS ((tree, rtx, enum machine_mode,
1816 enum expand_modifier, int));
1818 /* Initialize the table of functions to perform format checking on.
1819 The ISO C functions are always checked (whether <stdio.h> is
1820 included or not), since it is common to call printf without
1821 including <stdio.h>. There shouldn't be a problem with this,
1822 since ISO C reserves these function names whether you include the
1823 header file or not. In any case, the checking is harmless. With
1824 -ffreestanding, these default attributes are disabled, and must be
1825 specified manually if desired.
1827 Also initialize the name of function that modify the format string for
1828 internationalization purposes. */
1831 init_function_format_info ()
1835 /* Functions from ISO/IEC 9899:1990. */
1836 record_function_format (get_identifier ("printf"), NULL_TREE,
1837 printf_format_type, 1, 2);
1838 record_function_format (get_identifier ("__builtin_printf"), NULL_TREE,
1839 printf_format_type, 1, 2);
1840 record_function_format (get_identifier ("fprintf"), NULL_TREE,
1841 printf_format_type, 2, 3);
1842 record_function_format (get_identifier ("sprintf"), NULL_TREE,
1843 printf_format_type, 2, 3);
1844 record_function_format (get_identifier ("scanf"), NULL_TREE,
1845 scanf_format_type, 1, 2);
1846 record_function_format (get_identifier ("fscanf"), NULL_TREE,
1847 scanf_format_type, 2, 3);
1848 record_function_format (get_identifier ("sscanf"), NULL_TREE,
1849 scanf_format_type, 2, 3);
1850 record_function_format (get_identifier ("vprintf"), NULL_TREE,
1851 printf_format_type, 1, 0);
1852 record_function_format (get_identifier ("vfprintf"), NULL_TREE,
1853 printf_format_type, 2, 0);
1854 record_function_format (get_identifier ("vsprintf"), NULL_TREE,
1855 printf_format_type, 2, 0);
1856 record_function_format (get_identifier ("strftime"), NULL_TREE,
1857 strftime_format_type, 3, 0);
1860 if (flag_hosted && flag_isoc99)
1862 /* ISO C99 adds the snprintf and vscanf family functions. */
1863 record_function_format (get_identifier ("snprintf"), NULL_TREE,
1864 printf_format_type, 3, 4);
1865 record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
1866 printf_format_type, 3, 0);
1867 record_function_format (get_identifier ("vscanf"), NULL_TREE,
1868 scanf_format_type, 1, 0);
1869 record_function_format (get_identifier ("vfscanf"), NULL_TREE,
1870 scanf_format_type, 2, 0);
1871 record_function_format (get_identifier ("vsscanf"), NULL_TREE,
1872 scanf_format_type, 2, 0);
1875 if (flag_hosted && flag_noniso_default_format_attributes)
1877 /* Uniforum/GNU gettext functions, not in ISO C. */
1878 record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
1879 record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
1880 record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
1884 /* Record information for argument format checking. FUNCTION_IDENT is
1885 the identifier node for the name of the function to check (its decl
1886 need not exist yet).
1887 FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
1888 of the argument which is the format control string (starting from 1).
1889 FIRST_ARG_NUM is the number of the first actual argument to check
1890 against the format string, or zero if no checking is not be done
1891 (e.g. for varargs such as vfprintf). */
1894 record_function_format (name, assembler_name, format_type,
1895 format_num, first_arg_num)
1897 tree assembler_name;
1898 enum format_type format_type;
1902 function_format_info *info;
1904 /* Re-use existing structure if it's there. */
1906 for (info = function_format_list; info; info = info->next)
1908 if (info->name == name && info->assembler_name == assembler_name)
1913 info = (function_format_info *) xmalloc (sizeof (function_format_info));
1914 info->next = function_format_list;
1915 function_format_list = info;
1918 info->assembler_name = assembler_name;
1921 info->format_type = format_type;
1922 info->format_num = format_num;
1923 info->first_arg_num = first_arg_num;
1926 /* Record information for the names of function that modify the format
1927 argument to format functions. FUNCTION_IDENT is the identifier node for
1928 the name of the function (its decl need not exist yet) and FORMAT_NUM is
1929 the number of the argument which is the format control string (starting
1933 record_international_format (name, assembler_name, format_num)
1935 tree assembler_name;
1938 international_format_info *info;
1940 /* Re-use existing structure if it's there. */
1942 for (info = international_format_list; info; info = info->next)
1944 if (info->name == name && info->assembler_name == assembler_name)
1951 = (international_format_info *)
1952 xmalloc (sizeof (international_format_info));
1953 info->next = international_format_list;
1954 international_format_list = info;
1957 info->assembler_name = assembler_name;
1960 info->format_num = format_num;
1963 /* Check the argument list of a call to printf, scanf, etc.
1964 NAME is the function identifier.
1965 ASSEMBLER_NAME is the function's assembler identifier.
1966 (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
1967 PARAMS is the list of argument values. Also, if -Wmissing-format-attribute,
1968 warn for calls to vprintf or vscanf in functions with no such format
1969 attribute themselves. */
1972 check_function_format (status, name, assembler_name, params)
1975 tree assembler_name;
1978 function_format_info *info;
1980 /* See if this function is a format function. */
1981 for (info = function_format_list; info; info = info->next)
1983 if (info->assembler_name
1984 ? (info->assembler_name == assembler_name)
1985 : (info->name == name))
1987 /* Yup; check it. */
1988 check_format_info (status, info, params);
1989 if (warn_missing_format_attribute && info->first_arg_num == 0
1990 && (format_types[info->format_type].flags & FMT_FLAG_ARG_CONVERT))
1992 function_format_info *info2;
1993 for (info2 = function_format_list; info2; info2 = info2->next)
1994 if ((info2->assembler_name
1995 ? (info2->assembler_name == DECL_ASSEMBLER_NAME (current_function_decl))
1996 : (info2->name == DECL_NAME (current_function_decl)))
1997 && info2->format_type == info->format_type)
2000 warning ("function might be possible candidate for `%s' format attribute",
2001 format_types[info->format_type].name);
2008 /* This function replaces `warning' inside the printf format checking
2009 functions. If the `status' parameter is non-NULL, then it is
2010 dereferenced and set to 1 whenever a warning is caught. Otherwise
2011 it warns as usual by replicating the innards of the warning
2012 function from diagnostic.c. */
2014 status_warning VPARAMS ((int *status, const char *msgid, ...))
2016 #ifndef ANSI_PROTOTYPES
2021 diagnostic_context dc;
2027 VA_START (ap, msgid);
2029 #ifndef ANSI_PROTOTYPES
2030 status = va_arg (ap, int *);
2031 msgid = va_arg (ap, const char *);
2034 /* This duplicates the warning function behavior. */
2035 set_diagnostic_context
2036 (&dc, msgid, &ap, input_filename, lineno, /* warn = */ 1);
2037 report_diagnostic (&dc);
2043 /* Variables used by the checking of $ operand number formats. */
2044 static char *dollar_arguments_used = NULL;
2045 static int dollar_arguments_alloc = 0;
2046 static int dollar_arguments_count;
2047 static int dollar_first_arg_num;
2048 static int dollar_max_arg_used;
2049 static int dollar_format_warned;
2051 /* Initialize the checking for a format string that may contain $
2052 parameter number specifications; we will need to keep track of whether
2053 each parameter has been used. FIRST_ARG_NUM is the number of the first
2054 argument that is a parameter to the format, or 0 for a vprintf-style
2055 function; PARAMS is the list of arguments starting at this argument. */
2058 init_dollar_format_checking (first_arg_num, params)
2062 dollar_first_arg_num = first_arg_num;
2063 dollar_arguments_count = 0;
2064 dollar_max_arg_used = 0;
2065 dollar_format_warned = 0;
2066 if (first_arg_num > 0)
2070 dollar_arguments_count++;
2071 params = TREE_CHAIN (params);
2074 if (dollar_arguments_alloc < dollar_arguments_count)
2076 if (dollar_arguments_used)
2077 free (dollar_arguments_used);
2078 dollar_arguments_alloc = dollar_arguments_count;
2079 dollar_arguments_used = xmalloc (dollar_arguments_alloc);
2081 if (dollar_arguments_alloc)
2082 memset (dollar_arguments_used, 0, dollar_arguments_alloc);
2086 /* Look for a decimal number followed by a $ in *FORMAT. If DOLLAR_NEEDED
2087 is set, it is an error if one is not found; otherwise, it is OK. If
2088 such a number is found, check whether it is within range and mark that
2089 numbered operand as being used for later checking. Returns the operand
2090 number if found and within range, zero if no such number was found and
2091 this is OK, or -1 on error. PARAMS points to the first operand of the
2092 format; PARAM_PTR is made to point to the parameter referred to. If
2093 a $ format is found, *FORMAT is updated to point just after it. */
2096 maybe_read_dollar_number (status, format, dollar_needed, params, param_ptr,
2099 const char **format;
2103 const format_kind_info *fki;
2107 const char *fcp = *format;
2108 if (*fcp < '0' || *fcp > '9')
2112 status_warning (status, "missing $ operand number in format");
2120 while (*fcp >= '0' && *fcp <= '9')
2123 nargnum = 10 * argnum + (*fcp - '0');
2124 if (nargnum < 0 || nargnum / 10 != argnum)
2133 status_warning (status, "missing $ operand number in format");
2140 if (pedantic && !dollar_format_warned)
2142 status_warning (status,
2143 "%s does not support %%n$ operand number formats",
2144 C_STD_NAME (STD_EXT));
2145 dollar_format_warned = 1;
2147 if (overflow_flag || argnum == 0
2148 || (dollar_first_arg_num && argnum > dollar_arguments_count))
2150 status_warning (status, "operand number out of range in format");
2153 if (argnum > dollar_max_arg_used)
2154 dollar_max_arg_used = argnum;
2155 /* For vprintf-style functions we may need to allocate more memory to
2156 track which arguments are used. */
2157 while (dollar_arguments_alloc < dollar_max_arg_used)
2160 nalloc = 2 * dollar_arguments_alloc + 16;
2161 dollar_arguments_used = xrealloc (dollar_arguments_used, nalloc);
2162 memset (dollar_arguments_used + dollar_arguments_alloc, 0,
2163 nalloc - dollar_arguments_alloc);
2164 dollar_arguments_alloc = nalloc;
2166 if (!(fki->flags & FMT_FLAG_DOLLAR_MULTIPLE)
2167 && dollar_arguments_used[argnum - 1] == 1)
2169 dollar_arguments_used[argnum - 1] = 2;
2170 status_warning (status,
2171 "format argument %d used more than once in %s format",
2175 dollar_arguments_used[argnum - 1] = 1;
2176 if (dollar_first_arg_num)
2179 *param_ptr = params;
2180 for (i = 1; i < argnum && *param_ptr != 0; i++)
2181 *param_ptr = TREE_CHAIN (*param_ptr);
2183 if (*param_ptr == 0)
2185 /* This case shouldn't be caught here. */
2195 /* Finish the checking for a format string that used $ operand number formats
2196 instead of non-$ formats. We check for unused operands before used ones
2197 (a serious error, since the implementation of the format function
2198 can't know what types to pass to va_arg to find the later arguments).
2199 and for unused operands at the end of the format (if we know how many
2200 arguments the format had, so not for vprintf). If there were operand
2201 numbers out of range on a non-vprintf-style format, we won't have reached
2205 finish_dollar_format_checking (status, res)
2207 format_check_results *res;
2210 for (i = 0; i < dollar_max_arg_used; i++)
2212 if (!dollar_arguments_used[i])
2213 status_warning (status, "format argument %d unused before used argument %d in $-style format",
2214 i + 1, dollar_max_arg_used);
2216 if (dollar_first_arg_num && dollar_max_arg_used < dollar_arguments_count)
2218 res->number_other--;
2219 res->number_dollar_extra_args++;
2224 /* Retrieve the specification for a format flag. SPEC contains the
2225 specifications for format flags for the applicable kind of format.
2226 FLAG is the flag in question. If PREDICATES is NULL, the basic
2227 spec for that flag must be retrieved and this function aborts if
2228 it cannot be found. If PREDICATES is not NULL, it is a string listing
2229 possible predicates for the spec entry; if an entry predicated on any
2230 of these is found, it is returned, otherwise NULL is returned. */
2232 static const format_flag_spec *
2233 get_flag_spec (spec, flag, predicates)
2234 const format_flag_spec *spec;
2236 const char *predicates;
2239 for (i = 0; spec[i].flag_char != 0; i++)
2241 if (spec[i].flag_char != flag)
2243 if (predicates != NULL)
2245 if (spec[i].predicate != 0
2246 && index (predicates, spec[i].predicate) != 0)
2249 else if (spec[i].predicate == 0)
2252 if (predicates == NULL)
2259 /* Check the argument list of a call to printf, scanf, etc.
2260 INFO points to the function_format_info structure.
2261 PARAMS is the list of argument values. */
2264 check_format_info (status, info, params)
2266 function_format_info *info;
2271 format_check_results res;
2272 /* Skip to format argument. If the argument isn't available, there's
2273 no work for us to do; prototype checking will catch the problem. */
2274 for (arg_num = 1; ; ++arg_num)
2278 if (arg_num == info->format_num)
2280 params = TREE_CHAIN (params);
2282 format_tree = TREE_VALUE (params);
2283 params = TREE_CHAIN (params);
2284 if (format_tree == 0)
2287 res.number_non_literal = 0;
2288 res.number_extra_args = 0;
2289 res.number_dollar_extra_args = 0;
2290 res.number_wide = 0;
2291 res.number_empty = 0;
2292 res.number_unterminated = 0;
2293 res.number_other = 0;
2295 check_format_info_recurse (status, &res, info, format_tree, params, arg_num);
2297 if (res.number_non_literal > 0)
2299 /* Functions taking a va_list normally pass a non-literal format
2300 string. These functions typically are declared with
2301 first_arg_num == 0, so avoid warning in those cases. */
2302 if (info->first_arg_num != 0 && warn_format > 1)
2303 status_warning (status, "format not a string literal, argument types not checked");
2306 /* If there were extra arguments to the format, normally warn. However,
2307 the standard does say extra arguments are ignored, so in the specific
2308 case where we have multiple leaves (conditional expressions or
2309 ngettext) allow extra arguments if at least one leaf didn't have extra
2310 arguments, but was otherwise OK (either non-literal or checked OK).
2311 If the format is an empty string, this should be counted similarly to the
2312 case of extra format arguments. */
2313 if (res.number_extra_args > 0 && res.number_non_literal == 0
2314 && res.number_other == 0)
2315 status_warning (status, "too many arguments for format");
2316 if (res.number_dollar_extra_args > 0 && res.number_non_literal == 0
2317 && res.number_other == 0)
2318 status_warning (status, "unused arguments in $-style format");
2319 if (res.number_empty > 0 && res.number_non_literal == 0
2320 && res.number_other == 0)
2321 status_warning (status, "zero-length format string");
2323 if (res.number_wide > 0)
2324 status_warning (status, "format is a wide character string");
2326 if (res.number_unterminated > 0)
2327 status_warning (status, "unterminated format string");
2331 /* Recursively check a call to a format function. FORMAT_TREE is the
2332 format parameter, which may be a conditional expression in which
2333 both halves should be checked. ARG_NUM is the number of the
2334 format argument; PARAMS points just after it in the argument list. */
2337 check_format_info_recurse (status, res, info, format_tree, params, arg_num)
2339 format_check_results *res;
2340 function_format_info *info;
2346 const char *format_chars;
2348 if (TREE_CODE (format_tree) == NOP_EXPR)
2350 /* Strip coercion. */
2351 check_format_info_recurse (status, res, info,
2352 TREE_OPERAND (format_tree, 0), params,
2357 if (TREE_CODE (format_tree) == CALL_EXPR
2358 && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
2359 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
2362 tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
2364 /* See if this is a call to a known internationalization function
2365 that modifies the format arg. */
2366 international_format_info *iinfo;
2368 for (iinfo = international_format_list; iinfo; iinfo = iinfo->next)
2369 if (iinfo->assembler_name
2370 ? (iinfo->assembler_name == DECL_ASSEMBLER_NAME (function))
2371 : (iinfo->name == DECL_NAME (function)))
2376 for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
2378 inner_args = TREE_CHAIN (inner_args), i++)
2379 if (i == iinfo->format_num)
2381 /* FIXME: with Marc Espie's __attribute__((nonnull))
2382 patch in GCC, we will have chained attributes,
2383 and be able to handle functions like ngettext
2384 with multiple format_arg attributes properly. */
2385 check_format_info_recurse (status, res, info,
2386 TREE_VALUE (inner_args), params,
2393 if (TREE_CODE (format_tree) == COND_EXPR)
2395 /* Check both halves of the conditional expression. */
2396 check_format_info_recurse (status, res, info,
2397 TREE_OPERAND (format_tree, 1), params,
2399 check_format_info_recurse (status, res, info,
2400 TREE_OPERAND (format_tree, 2), params,
2405 if (integer_zerop (format_tree))
2407 /* FIXME: this warning should go away once Marc Espie's
2408 __attribute__((nonnull)) patch is in. Instead, checking for
2409 nonnull attributes should probably change this function to act
2410 specially if info == NULL and add a res->number_null entry for
2411 that case, or maybe add a function pointer to be called at
2412 the end instead of hardcoding check_format_info_main. */
2413 status_warning (status, "null format string");
2415 /* Skip to first argument to check, so we can see if this format
2416 has any arguments (it shouldn't). */
2417 while (arg_num + 1 < info->first_arg_num)
2421 params = TREE_CHAIN (params);
2426 res->number_other++;
2428 res->number_extra_args++;
2433 if (TREE_CODE (format_tree) != ADDR_EXPR)
2435 res->number_non_literal++;
2438 format_tree = TREE_OPERAND (format_tree, 0);
2439 if (TREE_CODE (format_tree) != STRING_CST)
2441 res->number_non_literal++;
2444 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (format_tree))) != char_type_node)
2449 format_chars = TREE_STRING_POINTER (format_tree);
2450 format_length = TREE_STRING_LENGTH (format_tree);
2451 if (format_length < 1)
2453 res->number_unterminated++;
2456 if (format_length == 1)
2458 res->number_empty++;
2461 if (format_chars[--format_length] != 0)
2463 res->number_unterminated++;
2467 /* Skip to first argument to check. */
2468 while (arg_num + 1 < info->first_arg_num)
2472 params = TREE_CHAIN (params);
2475 /* Provisionally increment res->number_other; check_format_info_main
2476 will decrement it if it finds there are extra arguments, but this way
2477 need not adjust it for every return. */
2478 res->number_other++;
2479 check_format_info_main (status, res, info, format_chars, format_length,
2484 /* Do the main part of checking a call to a format function. FORMAT_CHARS
2485 is the NUL-terminated format string (which at this point may contain
2486 internal NUL characters); FORMAT_LENGTH is its length (excluding the
2487 terminating NUL character). ARG_NUM is one less than the number of
2488 the first format argument to check; PARAMS points to that format
2489 argument in the list of arguments. */
2492 check_format_info_main (status, res, info, format_chars, format_length,
2495 format_check_results *res;
2496 function_format_info *info;
2497 const char *format_chars;
2502 const char *orig_format_chars = format_chars;
2503 tree first_fillin_param = params;
2505 const format_kind_info *fki = &format_types[info->format_type];
2506 const format_flag_spec *flag_specs = fki->flag_specs;
2507 const format_flag_pair *bad_flag_pairs = fki->bad_flag_pairs;
2509 /* -1 if no conversions taking an operand have been found; 0 if one has
2510 and it didn't use $; 1 if $ formats are in use. */
2511 int has_operand_number = -1;
2513 init_dollar_format_checking (info->first_arg_num, first_fillin_param);
2518 int suppressed = FALSE;
2519 const char *length_chars = NULL;
2520 enum format_lengths length_chars_val = FMT_LEN_none;
2521 enum format_std_version length_chars_std = STD_C89;
2525 int main_arg_num = 0;
2526 tree main_arg_params = 0;
2527 enum format_std_version wanted_type_std;
2528 const char *wanted_type_name;
2529 format_wanted_type width_wanted_type;
2530 format_wanted_type precision_wanted_type;
2531 format_wanted_type main_wanted_type;
2532 format_wanted_type *first_wanted_type = NULL;
2533 format_wanted_type *last_wanted_type = NULL;
2534 const format_length_info *fli = NULL;
2535 const format_char_info *fci = NULL;
2536 char flag_chars[256];
2538 if (*format_chars == 0)
2540 if (format_chars - orig_format_chars != format_length)
2541 status_warning (status, "embedded `\\0' in format");
2542 if (info->first_arg_num != 0 && params != 0
2543 && has_operand_number <= 0)
2545 res->number_other--;
2546 res->number_extra_args++;
2548 if (has_operand_number > 0)
2549 finish_dollar_format_checking (status, res);
2552 if (*format_chars++ != '%')
2554 if (*format_chars == 0)
2556 status_warning (status, "spurious trailing `%%' in format");
2559 if (*format_chars == '%')
2566 if ((fki->flags & FMT_FLAG_ARG_CONVERT) && has_operand_number != 0)
2568 /* Possibly read a $ operand number at the start of the format.
2569 If one was previously used, one is required here. If one
2570 is not used here, we can't immediately conclude this is a
2571 format without them, since it could be printf %m or scanf %*. */
2573 opnum = maybe_read_dollar_number (status, &format_chars, 0,
2575 &main_arg_params, fki);
2580 has_operand_number = 1;
2581 main_arg_num = opnum + info->first_arg_num - 1;
2585 /* Read any format flags, but do not yet validate them beyond removing
2586 duplicates, since in general validation depends on the rest of
2588 while (*format_chars != 0 && index (fki->flag_chars, *format_chars) != 0)
2590 if (index (flag_chars, *format_chars) != 0)
2592 const format_flag_spec *s = get_flag_spec (flag_specs,
2593 *format_chars, NULL);
2594 status_warning (status, "repeated %s in format", _(s->name));
2598 i = strlen (flag_chars);
2599 flag_chars[i++] = *format_chars;
2605 /* Read any format width, possibly * or *m$. */
2606 if (fki->width_char != 0)
2608 if (fki->width_type != NULL && *format_chars == '*')
2610 i = strlen (flag_chars);
2611 flag_chars[i++] = fki->width_char;
2613 /* "...a field width...may be indicated by an asterisk.
2614 In this case, an int argument supplies the field width..." */
2618 status_warning (status, "too few arguments for format");
2621 if (has_operand_number != 0)
2624 opnum = maybe_read_dollar_number (status, &format_chars,
2625 has_operand_number == 1,
2632 has_operand_number = 1;
2633 arg_num = opnum + info->first_arg_num - 1;
2636 has_operand_number = 0;
2638 if (info->first_arg_num != 0)
2640 cur_param = TREE_VALUE (params);
2641 if (has_operand_number <= 0)
2643 params = TREE_CHAIN (params);
2646 width_wanted_type.wanted_type = *fki->width_type;
2647 width_wanted_type.wanted_type_name = NULL;
2648 width_wanted_type.pointer_count = 0;
2649 width_wanted_type.char_lenient_flag = 0;
2650 width_wanted_type.writing_in_flag = 0;
2651 width_wanted_type.name = _("field width");
2652 width_wanted_type.param = cur_param;
2653 width_wanted_type.arg_num = arg_num;
2654 width_wanted_type.next = NULL;
2655 if (last_wanted_type != 0)
2656 last_wanted_type->next = &width_wanted_type;
2657 if (first_wanted_type == 0)
2658 first_wanted_type = &width_wanted_type;
2659 last_wanted_type = &width_wanted_type;
2664 /* Possibly read a numeric width. If the width is zero,
2665 we complain; for scanf this is bad according to the
2666 standard, and for printf and strftime it cannot occur
2667 because 0 is a flag. */
2668 int non_zero_width_char = FALSE;
2669 int found_width = FALSE;
2670 while (ISDIGIT (*format_chars))
2673 if (*format_chars != '0')
2674 non_zero_width_char = TRUE;
2677 if (found_width && !non_zero_width_char)
2678 status_warning (status, "zero width in %s format",
2682 i = strlen (flag_chars);
2683 flag_chars[i++] = fki->width_char;
2689 /* Read any format precision, possibly * or *m$. */
2690 if (fki->precision_char != 0 && *format_chars == '.')
2693 i = strlen (flag_chars);
2694 flag_chars[i++] = fki->precision_char;
2696 if (fki->precision_type != NULL && *format_chars == '*')
2698 /* "...a...precision...may be indicated by an asterisk.
2699 In this case, an int argument supplies the...precision." */
2701 if (has_operand_number != 0)
2704 opnum = maybe_read_dollar_number (status, &format_chars,
2705 has_operand_number == 1,
2712 has_operand_number = 1;
2713 arg_num = opnum + info->first_arg_num - 1;
2716 has_operand_number = 0;
2718 if (info->first_arg_num != 0)
2722 status_warning (status, "too few arguments for format");
2725 cur_param = TREE_VALUE (params);
2726 if (has_operand_number <= 0)
2728 params = TREE_CHAIN (params);
2731 precision_wanted_type.wanted_type = *fki->precision_type;
2732 precision_wanted_type.wanted_type_name = NULL;
2733 precision_wanted_type.pointer_count = 0;
2734 precision_wanted_type.char_lenient_flag = 0;
2735 precision_wanted_type.writing_in_flag = 0;
2736 precision_wanted_type.name = _("field precision");
2737 precision_wanted_type.param = cur_param;
2738 precision_wanted_type.arg_num = arg_num;
2739 precision_wanted_type.next = NULL;
2740 if (last_wanted_type != 0)
2741 last_wanted_type->next = &precision_wanted_type;
2742 if (first_wanted_type == 0)
2743 first_wanted_type = &precision_wanted_type;
2744 last_wanted_type = &precision_wanted_type;
2749 while (ISDIGIT (*format_chars))
2754 /* Read any length modifier, if this kind of format has them. */
2755 fli = fki->length_char_specs;
2756 length_chars = NULL;
2757 length_chars_val = FMT_LEN_none;
2758 length_chars_std = STD_C89;
2761 while (fli->name != 0 && fli->name[0] != *format_chars)
2766 if (fli->double_name != 0 && fli->name[0] == *format_chars)
2769 length_chars = fli->double_name;
2770 length_chars_val = fli->double_index;
2771 length_chars_std = fli->double_std;
2775 length_chars = fli->name;
2776 length_chars_val = fli->index;
2777 length_chars_std = fli->std;
2779 i = strlen (flag_chars);
2780 flag_chars[i++] = fki->length_code_char;
2785 /* Warn if the length modifier is non-standard. */
2786 if (length_chars_std > C_STD_VER)
2787 status_warning (status, "%s does not support the `%s' %s length modifier",
2788 C_STD_NAME (length_chars_std), length_chars,
2793 /* Read any modifier (strftime E/O). */
2794 if (fki->modifier_chars != NULL)
2796 while (*format_chars != 0
2797 && index (fki->modifier_chars, *format_chars) != 0)
2799 if (index (flag_chars, *format_chars) != 0)
2801 const format_flag_spec *s = get_flag_spec (flag_specs,
2802 *format_chars, NULL);
2803 status_warning (status, "repeated %s in format", _(s->name));
2807 i = strlen (flag_chars);
2808 flag_chars[i++] = *format_chars;
2815 /* Handle the scanf allocation kludge. */
2816 if (fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
2818 if (*format_chars == 'a' && !flag_isoc99)
2820 if (format_chars[1] == 's' || format_chars[1] == 'S'
2821 || format_chars[1] == '[')
2823 /* `a' is used as a flag. */
2824 i = strlen (flag_chars);
2825 flag_chars[i++] = 'a';
2832 format_char = *format_chars;
2833 if (format_char == 0
2834 || (!(fki->flags & FMT_FLAG_FANCY_PERCENT_OK) && format_char == '%'))
2836 status_warning (status, "conversion lacks type at end of format");
2840 fci = fki->conversion_specs;
2841 while (fci->format_chars != 0
2842 && index (fci->format_chars, format_char) == 0)
2844 if (fci->format_chars == 0)
2846 if (ISGRAPH(format_char))
2847 status_warning (status, "unknown conversion type character `%c' in format",
2850 status_warning (status, "unknown conversion type character 0x%x in format",
2856 if (fci->std > C_STD_VER)
2857 status_warning (status, "%s does not support the `%%%c' %s format",
2858 C_STD_NAME (fci->std), format_char, fki->name);
2861 /* Validate the individual flags used, removing any that are invalid. */
2864 for (i = 0; flag_chars[i] != 0; i++)
2866 const format_flag_spec *s = get_flag_spec (flag_specs,
2867 flag_chars[i], NULL);
2868 flag_chars[i - d] = flag_chars[i];
2869 if (flag_chars[i] == fki->length_code_char)
2871 if (index (fci->flag_chars, flag_chars[i]) == 0)
2873 status_warning (status, "%s used with `%%%c' %s format",
2874 _(s->name), format_char, fki->name);
2880 const format_flag_spec *t;
2881 if (s->std > C_STD_VER)
2882 status_warning (status, "%s does not support %s",
2883 C_STD_NAME (s->std), _(s->long_name));
2884 t = get_flag_spec (flag_specs, flag_chars[i], fci->flags2);
2885 if (t != NULL && t->std > s->std)
2887 const char *long_name = (t->long_name != NULL
2890 if (t->std > C_STD_VER)
2891 status_warning (status, "%s does not support %s with the `%%%c' %s format",
2892 C_STD_NAME (t->std), _(long_name),
2893 format_char, fki->name);
2897 flag_chars[i - d] = 0;
2900 if ((fki->flags & FMT_FLAG_SCANF_A_KLUDGE)
2901 && index (flag_chars, 'a') != 0)
2904 if (fki->suppression_char
2905 && index (flag_chars, fki->suppression_char) != 0)
2908 /* Validate the pairs of flags used. */
2909 for (i = 0; bad_flag_pairs[i].flag_char1 != 0; i++)
2911 const format_flag_spec *s, *t;
2912 if (index (flag_chars, bad_flag_pairs[i].flag_char1) == 0)
2914 if (index (flag_chars, bad_flag_pairs[i].flag_char2) == 0)
2916 if (bad_flag_pairs[i].predicate != 0
2917 && index (fci->flags2, bad_flag_pairs[i].predicate) == 0)
2919 s = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char1, NULL);
2920 t = get_flag_spec (flag_specs, bad_flag_pairs[i].flag_char2, NULL);
2921 if (bad_flag_pairs[i].ignored)
2923 if (bad_flag_pairs[i].predicate != 0)
2924 status_warning (status, "%s ignored with %s and `%%%c' %s format",
2925 _(s->name), _(t->name), format_char,
2928 status_warning (status, "%s ignored with %s in %s format",
2929 _(s->name), _(t->name), fki->name);
2933 if (bad_flag_pairs[i].predicate != 0)
2934 status_warning (status, "use of %s and %s together with `%%%c' %s format",
2935 _(s->name), _(t->name), format_char,
2938 status_warning (status, "use of %s and %s together in %s format",
2939 _(s->name), _(t->name), fki->name);
2943 /* Give Y2K warnings. */
2946 if (index (fci->flags2, '4') != 0)
2947 if (index (flag_chars, 'E') != 0)
2951 else if (index (fci->flags2, '3') != 0)
2953 else if (index (fci->flags2, '2') != 0)
2956 status_warning (status, "`%%%c' yields only last 2 digits of year in some locales",
2958 else if (y2k_level == 2)
2959 status_warning (status, "`%%%c' yields only last 2 digits of year", format_char);
2962 if (index (fci->flags2, '[') != 0)
2964 /* Skip over scan set, in case it happens to have '%' in it. */
2965 if (*format_chars == '^')
2967 /* Find closing bracket; if one is hit immediately, then
2968 it's part of the scan set rather than a terminator. */
2969 if (*format_chars == ']')
2971 while (*format_chars && *format_chars != ']')
2973 if (*format_chars != ']')
2974 /* The end of the format string was reached. */
2975 status_warning (status, "no closing `]' for `%%[' format");
2979 wanted_type_name = 0;
2980 if (fki->flags & FMT_FLAG_ARG_CONVERT)
2982 wanted_type = (fci->types[length_chars_val].type
2983 ? *fci->types[length_chars_val].type : 0);
2984 wanted_type_name = fci->types[length_chars_val].name;
2985 wanted_type_std = fci->types[length_chars_val].std;
2986 if (wanted_type == 0)
2988 status_warning (status, "use of `%s' length modifier with `%c' type character",
2989 length_chars, format_char);
2990 /* Heuristic: skip one argument when an invalid length/type
2991 combination is encountered. */
2995 status_warning (status, "too few arguments for format");
2998 params = TREE_CHAIN (params);
3002 /* Warn if non-standard, provided it is more non-standard
3003 than the length and type characters that may already
3004 have been warned for. */
3005 && wanted_type_std > length_chars_std
3006 && wanted_type_std > fci->std)
3008 if (wanted_type_std > C_STD_VER)
3009 status_warning (status, "%s does not support the `%%%s%c' %s format",
3010 C_STD_NAME (wanted_type_std), length_chars,
3011 format_char, fki->name);
3015 /* Finally. . .check type of argument against desired type! */
3016 if (info->first_arg_num == 0)
3018 if ((fci->pointer_count == 0 && wanted_type == void_type_node)
3021 if (main_arg_num != 0)
3024 status_warning (status, "operand number specified with suppressed assignment");
3026 status_warning (status, "operand number specified for format taking no argument");
3031 if (main_arg_num != 0)
3033 arg_num = main_arg_num;
3034 params = main_arg_params;
3039 if (has_operand_number > 0)
3041 status_warning (status, "missing $ operand number in format");
3045 has_operand_number = 0;
3048 status_warning (status, "too few arguments for format");
3052 cur_param = TREE_VALUE (params);
3053 params = TREE_CHAIN (params);
3054 main_wanted_type.wanted_type = wanted_type;
3055 main_wanted_type.wanted_type_name = wanted_type_name;
3056 main_wanted_type.pointer_count = fci->pointer_count + aflag;
3057 main_wanted_type.char_lenient_flag = 0;
3058 if (index (fci->flags2, 'c') != 0)
3059 main_wanted_type.char_lenient_flag = 1;
3060 main_wanted_type.writing_in_flag = 0;
3061 if (index (fci->flags2, 'W') != 0)
3062 main_wanted_type.writing_in_flag = 1;
3063 main_wanted_type.name = NULL;
3064 main_wanted_type.param = cur_param;
3065 main_wanted_type.arg_num = arg_num;
3066 main_wanted_type.next = NULL;
3067 if (last_wanted_type != 0)
3068 last_wanted_type->next = &main_wanted_type;
3069 if (first_wanted_type == 0)
3070 first_wanted_type = &main_wanted_type;
3071 last_wanted_type = &main_wanted_type;
3074 if (first_wanted_type != 0)
3075 check_format_types (status, first_wanted_type);
3081 /* Check the argument types from a single format conversion (possibly
3082 including width and precision arguments). */
3084 check_format_types (status, types)
3086 format_wanted_type *types;
3088 for (; types != 0; types = types->next)
3098 cur_param = types->param;
3099 cur_type = TREE_TYPE (cur_param);
3100 if (TREE_CODE (cur_type) == ERROR_MARK)
3103 wanted_type = types->wanted_type;
3104 arg_num = types->arg_num;
3106 /* The following should not occur here. */
3107 if (wanted_type == 0)
3109 if (wanted_type == void_type_node && types->pointer_count == 0)
3112 if (types->pointer_count == 0)
3114 promoted_type = simple_type_promotes_to (wanted_type);
3115 if (promoted_type != NULL_TREE)
3116 wanted_type = promoted_type;
3119 STRIP_NOPS (cur_param);
3121 /* Check the types of any additional pointer arguments
3122 that precede the "real" argument. */
3123 for (i = 0; i < types->pointer_count; ++i)
3125 if (TREE_CODE (cur_type) == POINTER_TYPE)
3127 cur_type = TREE_TYPE (cur_type);
3128 if (TREE_CODE (cur_type) == ERROR_MARK)
3131 /* Check for writing through a NULL pointer. */
3132 if (types->writing_in_flag
3135 && integer_zerop (cur_param))
3136 status_warning (status,
3137 "writing through null pointer (arg %d)",
3140 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
3141 cur_param = TREE_OPERAND (cur_param, 0);
3145 /* See if this is an attempt to write into a const type with
3146 scanf or with printf "%n". Note: the writing in happens
3147 at the first indirection only, if for example
3148 void * const * is passed to scanf %p; passing
3149 const void ** is simply passing an incompatible type. */
3150 if (types->writing_in_flag
3152 && (TYPE_READONLY (cur_type)
3154 && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
3155 || (DECL_P (cur_param)
3156 && TREE_READONLY (cur_param))))))
3157 status_warning (status, "writing into constant object (arg %d)", arg_num);
3159 /* If there are extra type qualifiers beyond the first
3160 indirection, then this makes the types technically
3164 && (TYPE_READONLY (cur_type)
3165 || TYPE_VOLATILE (cur_type)
3166 || TYPE_RESTRICT (cur_type)))
3167 status_warning (status, "extra type qualifiers in format argument (arg %d)",
3173 if (types->pointer_count == 1)
3174 status_warning (status, "format argument is not a pointer (arg %d)", arg_num);
3176 status_warning (status, "format argument is not a pointer to a pointer (arg %d)", arg_num);
3181 if (i < types->pointer_count)
3184 orig_cur_type = cur_type;
3185 cur_type = TYPE_MAIN_VARIANT (cur_type);
3187 /* Check whether the argument type is a character type. This leniency
3188 only applies to certain formats, flagged with 'c'.
3190 if (types->char_lenient_flag)
3191 char_type_flag = (cur_type == char_type_node
3192 || cur_type == signed_char_type_node
3193 || cur_type == unsigned_char_type_node);
3195 /* Check the type of the "real" argument, if there's a type we want. */
3196 if (wanted_type == cur_type)
3198 /* If we want `void *', allow any pointer type.
3199 (Anything else would already have got a warning.)
3200 With -pedantic, only allow pointers to void and to character
3202 if (wanted_type == void_type_node
3203 && (!pedantic || (i == 1 && char_type_flag)))
3205 /* Don't warn about differences merely in signedness, unless
3206 -pedantic. With -pedantic, warn if the type is a pointer
3207 target and not a character type, and for character types at
3208 a second level of indirection. */
3209 if (TREE_CODE (wanted_type) == INTEGER_TYPE
3210 && TREE_CODE (cur_type) == INTEGER_TYPE
3211 && (! pedantic || i == 0 || (i == 1 && char_type_flag))
3212 && (TREE_UNSIGNED (wanted_type)
3213 ? wanted_type == unsigned_type (cur_type)
3214 : wanted_type == signed_type (cur_type)))
3216 /* Likewise, "signed char", "unsigned char" and "char" are
3217 equivalent but the above test won't consider them equivalent. */
3218 if (wanted_type == char_type_node
3219 && (! pedantic || i < 2)
3222 /* Now we have a type mismatch. */
3224 register const char *this;
3225 register const char *that;
3227 this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
3229 if (TYPE_NAME (orig_cur_type) != 0
3230 && TREE_CODE (orig_cur_type) != INTEGER_TYPE
3231 && !(TREE_CODE (orig_cur_type) == POINTER_TYPE
3232 && TREE_CODE (TREE_TYPE (orig_cur_type)) == INTEGER_TYPE))
3234 if (TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL
3235 && DECL_NAME (TYPE_NAME (orig_cur_type)) != 0)
3236 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
3238 that = IDENTIFIER_POINTER (TYPE_NAME (orig_cur_type));
3241 /* A nameless type can't possibly match what the format wants.
3242 So there will be a warning for it.
3243 Make up a string to describe vaguely what it is. */
3246 if (TREE_CODE (orig_cur_type) == POINTER_TYPE)
3249 that = "different type";
3252 /* Make the warning better in case of mismatch of int vs long. */
3253 if (TREE_CODE (orig_cur_type) == INTEGER_TYPE
3254 && TREE_CODE (wanted_type) == INTEGER_TYPE
3255 && TYPE_PRECISION (orig_cur_type) == TYPE_PRECISION (wanted_type)
3256 && TYPE_NAME (orig_cur_type) != 0
3257 && TREE_CODE (TYPE_NAME (orig_cur_type)) == TYPE_DECL)
3258 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (orig_cur_type)));
3260 if (strcmp (this, that) != 0)
3262 /* There may be a better name for the format, e.g. size_t,
3263 but we should allow for programs with a perverse typedef
3264 making size_t something other than what the compiler
3266 if (types->wanted_type_name != 0
3267 && strcmp (types->wanted_type_name, that) != 0)
3268 this = types->wanted_type_name;
3269 if (types->name != 0)
3270 status_warning (status, "%s is not type %s (arg %d)", types->name, this,
3273 status_warning (status, "%s format, %s arg (arg %d)", this, that, arg_num);
3279 /* Print a warning if a constant expression had overflow in folding.
3280 Invoke this function on every expression that the language
3281 requires to be a constant expression.
3282 Note the ANSI C standard says it is erroneous for a
3283 constant expression to overflow. */
3286 constant_expression_warning (value)
3289 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
3290 || TREE_CODE (value) == COMPLEX_CST)
3291 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
3292 pedwarn ("overflow in constant expression");
3295 /* Print a warning if an expression had overflow in folding.
3296 Invoke this function on every expression that
3297 (1) appears in the source code, and
3298 (2) might be a constant expression that overflowed, and
3299 (3) is not already checked by convert_and_check;
3300 however, do not invoke this function on operands of explicit casts. */
3303 overflow_warning (value)
3306 if ((TREE_CODE (value) == INTEGER_CST
3307 || (TREE_CODE (value) == COMPLEX_CST
3308 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
3309 && TREE_OVERFLOW (value))
3311 TREE_OVERFLOW (value) = 0;
3312 if (skip_evaluation == 0)
3313 warning ("integer overflow in expression");
3315 else if ((TREE_CODE (value) == REAL_CST
3316 || (TREE_CODE (value) == COMPLEX_CST
3317 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
3318 && TREE_OVERFLOW (value))
3320 TREE_OVERFLOW (value) = 0;
3321 if (skip_evaluation == 0)
3322 warning ("floating point overflow in expression");
3326 /* Print a warning if a large constant is truncated to unsigned,
3327 or if -Wconversion is used and a constant < 0 is converted to unsigned.
3328 Invoke this function on every expression that might be implicitly
3329 converted to an unsigned type. */
3332 unsigned_conversion_warning (result, operand)
3333 tree result, operand;
3335 if (TREE_CODE (operand) == INTEGER_CST
3336 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
3337 && TREE_UNSIGNED (TREE_TYPE (result))
3338 && skip_evaluation == 0
3339 && !int_fits_type_p (operand, TREE_TYPE (result)))
3341 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
3342 /* This detects cases like converting -129 or 256 to unsigned char. */
3343 warning ("large integer implicitly truncated to unsigned type");
3344 else if (warn_conversion)
3345 warning ("negative integer implicitly converted to unsigned type");
3349 /* Convert EXPR to TYPE, warning about conversion problems with constants.
3350 Invoke this function on every expression that is converted implicitly,
3351 i.e. because of language rules and not because of an explicit cast. */
3354 convert_and_check (type, expr)
3357 tree t = convert (type, expr);
3358 if (TREE_CODE (t) == INTEGER_CST)
3360 if (TREE_OVERFLOW (t))
3362 TREE_OVERFLOW (t) = 0;
3364 /* Do not diagnose overflow in a constant expression merely
3365 because a conversion overflowed. */
3366 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
3368 /* No warning for converting 0x80000000 to int. */
3369 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
3370 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
3371 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
3372 /* If EXPR fits in the unsigned version of TYPE,
3373 don't warn unless pedantic. */
3375 || TREE_UNSIGNED (type)
3376 || ! int_fits_type_p (expr, unsigned_type (type)))
3377 && skip_evaluation == 0)
3378 warning ("overflow in implicit constant conversion");
3381 unsigned_conversion_warning (t, expr);
3386 /* Describe a reversed version of a normal tree, so that we can get to the
3387 parent of each node. */
3390 /* All reverse_tree structures for a given tree are chained through this
3392 struct reverse_tree *next;
3393 /* The parent of this node. */
3394 struct reverse_tree *parent;
3395 /* The actual tree node. */
3397 /* The operand number this node corresponds to in the parent. */
3399 /* Describe whether this expression is written to or read. */
3403 /* A list of all reverse_tree structures for a given expression, built by
3404 build_reverse_tree. */
3405 static struct reverse_tree *reverse_list;
3406 /* The maximum depth of a tree, computed by build_reverse_tree. */
3407 static int reverse_max_depth;
3409 static void build_reverse_tree PARAMS ((tree, struct reverse_tree *, int, int,
3411 static struct reverse_tree *common_ancestor PARAMS ((struct reverse_tree *,
3412 struct reverse_tree *,
3413 struct reverse_tree **,
3414 struct reverse_tree **));
3415 static int modify_ok PARAMS ((struct reverse_tree *, struct reverse_tree *));
3416 static void verify_sequence_points PARAMS ((tree));
3418 /* Recursively process an expression, X, building a reverse tree while
3419 descending and recording OPERANDNO, READ, and WRITE in the created
3420 structures. DEPTH is used to compute reverse_max_depth.
3421 FIXME: if walk_tree gets moved out of the C++ front end, this should
3422 probably use walk_tree. */
3425 build_reverse_tree (x, parent, operandno, read, write, depth)
3427 struct reverse_tree *parent;
3428 int operandno, read, write, depth;
3430 struct reverse_tree *node;
3432 if (x == 0 || x == error_mark_node)
3435 node = (struct reverse_tree *) xmalloc (sizeof (struct reverse_tree));
3437 node->parent = parent;
3440 node->write = write;
3441 node->operandno = operandno;
3442 node->next = reverse_list;
3443 reverse_list = node;
3444 if (depth > reverse_max_depth)
3445 reverse_max_depth = depth;
3447 switch (TREE_CODE (x))
3449 case PREDECREMENT_EXPR:
3450 case PREINCREMENT_EXPR:
3451 case POSTDECREMENT_EXPR:
3452 case POSTINCREMENT_EXPR:
3453 build_reverse_tree (TREE_OPERAND (x, 0), node, 0, 1, 1, depth + 1);
3457 build_reverse_tree (TREE_OPERAND (x, 0), node, 0, 1, 0, depth + 1);
3458 x = TREE_OPERAND (x, 1);
3461 build_reverse_tree (TREE_VALUE (x), node, 1, 1, 0, depth + 1);
3467 /* Scan all the list, e.g. indices of multi dimensional array. */
3470 build_reverse_tree (TREE_VALUE (x), node, 0, 1, 0, depth + 1);
3476 build_reverse_tree (TREE_OPERAND (x, 0), node, 0, 0, 1, depth + 1);
3477 build_reverse_tree (TREE_OPERAND (x, 1), node, 1, 1, 0, depth + 1);
3481 switch (TREE_CODE_CLASS (TREE_CODE (x)))
3493 int max = first_rtl_op (TREE_CODE (x));
3494 for (lp = 0; lp < max; lp++)
3495 build_reverse_tree (TREE_OPERAND (x, lp), node, lp, 1, 0,
3506 /* Given nodes P1 and P2 as well as enough scratch space pointed to by TMP1
3507 and TMP2, find the common ancestor of P1 and P2. */
3509 static struct reverse_tree *
3510 common_ancestor (p1, p2, tmp1, tmp2)
3511 struct reverse_tree *p1, *p2;
3512 struct reverse_tree **tmp1, **tmp2;
3514 struct reverse_tree *t1 = p1;
3515 struct reverse_tree *t2 = p2;
3518 /* First, check if we're actually looking at the same expression twice,
3519 which can happen if it's wrapped in a SAVE_EXPR - in this case there's
3520 no chance of conflict. */
3521 while (t1 && t2 && t1->x == t2->x)
3523 if (TREE_CODE (t1->x) == SAVE_EXPR)
3529 for (i = 0; p1; i++, p1 = p1->parent)
3531 for (j = 0; p2; j++, p2 = p2->parent)
3533 while (tmp1[i - 1] == tmp2[j - 1])
3539 /* Subroutine of verify_sequence_points to check whether a node T corresponding
3540 to a MODIFY_EXPR invokes undefined behaviour. OTHER occurs somewhere in the
3541 RHS, and an identical expression is the LHS of T.
3542 For MODIFY_EXPRs, some special cases apply when testing for undefined
3543 behaviour if one of the expressions we found is the LHS of the MODIFY_EXPR.
3544 If the other expression is just a use, then there's no undefined behaviour.
3545 Likewise, if the other expression is wrapped inside another expression that
3546 will force a sequence point, then there's no undefined behaviour either. */
3549 modify_ok (t, other)
3550 struct reverse_tree *t, *other;
3552 struct reverse_tree *p;
3557 /* See if there's an intervening sequence point. */
3558 for (p = other; p->parent != t; p = p->parent)
3560 if ((TREE_CODE (p->parent->x) == COMPOUND_EXPR
3561 || TREE_CODE (p->parent->x) == TRUTH_ANDIF_EXPR
3562 || TREE_CODE (p->parent->x) == TRUTH_ORIF_EXPR
3563 || TREE_CODE (p->parent->x) == COND_EXPR)
3564 && p->operandno == 0)
3566 if (TREE_CODE (p->parent->x) == SAVE_EXPR)
3568 if (TREE_CODE (p->parent->x) == CALL_EXPR
3569 && p->operandno != 0)
3575 /* Try to warn for undefined behaviour in EXPR due to missing sequence
3579 verify_sequence_points (expr)
3582 struct reverse_tree **tmp1, **tmp2;
3583 struct reverse_tree *p;
3586 reverse_max_depth = 0;
3587 build_reverse_tree (expr, NULL, 0, 1, 0, 1);
3589 tmp1 = (struct reverse_tree **) xmalloc (sizeof (struct reverse_tree *)
3590 * reverse_max_depth);
3591 tmp2 = (struct reverse_tree **) xmalloc (sizeof (struct reverse_tree *)
3592 * reverse_max_depth);
3594 /* Search for multiple occurrences of the same variable, where either both
3595 occurrences are writes, or one is a read and a write. If we can't prove
3596 that these are ordered by a sequence point, warn that the expression is
3598 for (p = reverse_list; p; p = p->next)
3600 struct reverse_tree *p2;
3601 if (TREE_CODE (p->x) != VAR_DECL && TREE_CODE (p->x) != PARM_DECL)
3603 for (p2 = p->next; p2; p2 = p2->next)
3605 if ((TREE_CODE (p2->x) == VAR_DECL || TREE_CODE (p2->x) == PARM_DECL)
3606 && DECL_NAME (p->x) == DECL_NAME (p2->x)
3607 && (p->write || p2->write))
3609 struct reverse_tree *t = common_ancestor (p, p2, tmp1, tmp2);
3612 || TREE_CODE (t->x) == COMPOUND_EXPR
3613 || TREE_CODE (t->x) == TRUTH_ANDIF_EXPR
3614 || TREE_CODE (t->x) == TRUTH_ORIF_EXPR
3615 || TREE_CODE (t->x) == COND_EXPR)
3617 if (TREE_CODE (t->x) == MODIFY_EXPR
3619 && modify_ok (t, p2))
3621 if (TREE_CODE (t->x) == MODIFY_EXPR
3623 && modify_ok (t, p))
3626 warning ("operation on `%s' may be undefined",
3627 IDENTIFIER_POINTER (DECL_NAME (p->x)));
3633 while (reverse_list)
3635 struct reverse_tree *p = reverse_list;
3636 reverse_list = p->next;
3644 c_expand_expr_stmt (expr)
3647 /* Do default conversion if safe and possibly important,
3648 in case within ({...}). */
3649 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
3650 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
3651 expr = default_conversion (expr);
3653 if (warn_sequence_point)
3654 verify_sequence_points (expr);
3656 if (TREE_TYPE (expr) != error_mark_node
3657 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
3658 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
3659 error ("expression statement has incomplete type");
3661 last_expr_type = TREE_TYPE (expr);
3662 add_stmt (build_stmt (EXPR_STMT, expr));
3665 /* Validate the expression after `case' and apply default promotions. */
3668 check_case_value (value)
3671 if (value == NULL_TREE)
3674 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3675 STRIP_TYPE_NOPS (value);
3676 /* In C++, the following is allowed:
3679 switch (...) { case i: ... }
3681 So, we try to reduce the VALUE to a constant that way. */
3682 if (c_language == clk_cplusplus)
3684 value = decl_constant_value (value);
3685 STRIP_TYPE_NOPS (value);
3686 value = fold (value);
3689 if (TREE_CODE (value) != INTEGER_CST
3690 && value != error_mark_node)
3692 error ("case label does not reduce to an integer constant");
3693 value = error_mark_node;
3696 /* Promote char or short to int. */
3697 value = default_conversion (value);
3699 constant_expression_warning (value);
3704 /* Return an integer type with BITS bits of precision,
3705 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
3708 type_for_size (bits, unsignedp)
3712 if (bits == TYPE_PRECISION (integer_type_node))
3713 return unsignedp ? unsigned_type_node : integer_type_node;
3715 if (bits == TYPE_PRECISION (signed_char_type_node))
3716 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3718 if (bits == TYPE_PRECISION (short_integer_type_node))
3719 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3721 if (bits == TYPE_PRECISION (long_integer_type_node))
3722 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3724 if (bits == TYPE_PRECISION (long_long_integer_type_node))
3725 return (unsignedp ? long_long_unsigned_type_node
3726 : long_long_integer_type_node);
3728 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
3729 return (unsignedp ? widest_unsigned_literal_type_node
3730 : widest_integer_literal_type_node);
3732 if (bits <= TYPE_PRECISION (intQI_type_node))
3733 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3735 if (bits <= TYPE_PRECISION (intHI_type_node))
3736 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3738 if (bits <= TYPE_PRECISION (intSI_type_node))
3739 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3741 if (bits <= TYPE_PRECISION (intDI_type_node))
3742 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3747 /* Return a data type that has machine mode MODE.
3748 If the mode is an integer,
3749 then UNSIGNEDP selects between signed and unsigned types. */
3752 type_for_mode (mode, unsignedp)
3753 enum machine_mode mode;
3756 if (mode == TYPE_MODE (integer_type_node))
3757 return unsignedp ? unsigned_type_node : integer_type_node;
3759 if (mode == TYPE_MODE (signed_char_type_node))
3760 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3762 if (mode == TYPE_MODE (short_integer_type_node))
3763 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3765 if (mode == TYPE_MODE (long_integer_type_node))
3766 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3768 if (mode == TYPE_MODE (long_long_integer_type_node))
3769 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
3771 if (mode == TYPE_MODE (widest_integer_literal_type_node))
3772 return unsignedp ? widest_unsigned_literal_type_node
3773 : widest_integer_literal_type_node;
3775 if (mode == TYPE_MODE (intQI_type_node))
3776 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
3778 if (mode == TYPE_MODE (intHI_type_node))
3779 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
3781 if (mode == TYPE_MODE (intSI_type_node))
3782 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
3784 if (mode == TYPE_MODE (intDI_type_node))
3785 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
3787 #if HOST_BITS_PER_WIDE_INT >= 64
3788 if (mode == TYPE_MODE (intTI_type_node))
3789 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
3792 if (mode == TYPE_MODE (float_type_node))
3793 return float_type_node;
3795 if (mode == TYPE_MODE (double_type_node))
3796 return double_type_node;
3798 if (mode == TYPE_MODE (long_double_type_node))
3799 return long_double_type_node;
3801 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
3802 return build_pointer_type (char_type_node);
3804 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
3805 return build_pointer_type (integer_type_node);
3807 #ifdef VECTOR_MODE_SUPPORTED_P
3808 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3809 return V4SF_type_node;
3810 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3811 return V4SI_type_node;
3812 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3813 return V2SI_type_node;
3814 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3815 return V4HI_type_node;
3816 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
3817 return V8QI_type_node;
3823 /* Return an unsigned type the same as TYPE in other respects. */
3825 unsigned_type (type)
3828 tree type1 = TYPE_MAIN_VARIANT (type);
3829 if (type1 == signed_char_type_node || type1 == char_type_node)
3830 return unsigned_char_type_node;
3831 if (type1 == integer_type_node)
3832 return unsigned_type_node;
3833 if (type1 == short_integer_type_node)
3834 return short_unsigned_type_node;
3835 if (type1 == long_integer_type_node)
3836 return long_unsigned_type_node;
3837 if (type1 == long_long_integer_type_node)
3838 return long_long_unsigned_type_node;
3839 if (type1 == widest_integer_literal_type_node)
3840 return widest_unsigned_literal_type_node;
3841 #if HOST_BITS_PER_WIDE_INT >= 64
3842 if (type1 == intTI_type_node)
3843 return unsigned_intTI_type_node;
3845 if (type1 == intDI_type_node)
3846 return unsigned_intDI_type_node;
3847 if (type1 == intSI_type_node)
3848 return unsigned_intSI_type_node;
3849 if (type1 == intHI_type_node)
3850 return unsigned_intHI_type_node;
3851 if (type1 == intQI_type_node)
3852 return unsigned_intQI_type_node;
3854 return signed_or_unsigned_type (1, type);
3857 /* Return a signed type the same as TYPE in other respects. */
3863 tree type1 = TYPE_MAIN_VARIANT (type);
3864 if (type1 == unsigned_char_type_node || type1 == char_type_node)
3865 return signed_char_type_node;
3866 if (type1 == unsigned_type_node)
3867 return integer_type_node;
3868 if (type1 == short_unsigned_type_node)
3869 return short_integer_type_node;
3870 if (type1 == long_unsigned_type_node)
3871 return long_integer_type_node;
3872 if (type1 == long_long_unsigned_type_node)
3873 return long_long_integer_type_node;
3874 if (type1 == widest_unsigned_literal_type_node)
3875 return widest_integer_literal_type_node;
3876 #if HOST_BITS_PER_WIDE_INT >= 64
3877 if (type1 == unsigned_intTI_type_node)
3878 return intTI_type_node;
3880 if (type1 == unsigned_intDI_type_node)
3881 return intDI_type_node;
3882 if (type1 == unsigned_intSI_type_node)
3883 return intSI_type_node;
3884 if (type1 == unsigned_intHI_type_node)
3885 return intHI_type_node;
3886 if (type1 == unsigned_intQI_type_node)
3887 return intQI_type_node;
3889 return signed_or_unsigned_type (0, type);
3892 /* Return a type the same as TYPE except unsigned or
3893 signed according to UNSIGNEDP. */
3896 signed_or_unsigned_type (unsignedp, type)
3900 if (! INTEGRAL_TYPE_P (type)
3901 || TREE_UNSIGNED (type) == unsignedp)
3904 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
3905 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
3906 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
3907 return unsignedp ? unsigned_type_node : integer_type_node;
3908 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
3909 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
3910 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
3911 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
3912 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
3913 return (unsignedp ? long_long_unsigned_type_node
3914 : long_long_integer_type_node);
3915 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
3916 return (unsignedp ? widest_unsigned_literal_type_node
3917 : widest_integer_literal_type_node);
3921 /* Return the minimum number of bits needed to represent VALUE in a
3922 signed or unsigned type, UNSIGNEDP says which. */
3925 min_precision (value, unsignedp)
3931 /* If the value is negative, compute its negative minus 1. The latter
3932 adjustment is because the absolute value of the largest negative value
3933 is one larger than the largest positive value. This is equivalent to
3934 a bit-wise negation, so use that operation instead. */
3936 if (tree_int_cst_sgn (value) < 0)
3937 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
3939 /* Return the number of bits needed, taking into account the fact
3940 that we need one more bit for a signed than unsigned type. */
3942 if (integer_zerop (value))
3945 log = tree_floor_log2 (value);
3947 return log + 1 + ! unsignedp;
3950 /* Print an error message for invalid operands to arith operation CODE.
3951 NOP_EXPR is used as a special case (see truthvalue_conversion). */
3954 binary_op_error (code)
3955 enum tree_code code;
3957 register const char *opname;
3962 error ("invalid truth-value expression");
3966 opname = "+"; break;
3968 opname = "-"; break;
3970 opname = "*"; break;
3972 opname = "max"; break;
3974 opname = "min"; break;
3976 opname = "=="; break;
3978 opname = "!="; break;
3980 opname = "<="; break;
3982 opname = ">="; break;
3984 opname = "<"; break;
3986 opname = ">"; break;
3988 opname = "<<"; break;
3990 opname = ">>"; break;
3991 case TRUNC_MOD_EXPR:
3992 case FLOOR_MOD_EXPR:
3993 opname = "%"; break;
3994 case TRUNC_DIV_EXPR:
3995 case FLOOR_DIV_EXPR:
3996 opname = "/"; break;
3998 opname = "&"; break;
4000 opname = "|"; break;
4001 case TRUTH_ANDIF_EXPR:
4002 opname = "&&"; break;
4003 case TRUTH_ORIF_EXPR:
4004 opname = "||"; break;
4006 opname = "^"; break;
4009 opname = "rotate"; break;
4011 opname = "unknown"; break;
4013 error ("invalid operands to binary %s", opname);
4016 /* Subroutine of build_binary_op, used for comparison operations.
4017 See if the operands have both been converted from subword integer types
4018 and, if so, perhaps change them both back to their original type.
4019 This function is also responsible for converting the two operands
4020 to the proper common type for comparison.
4022 The arguments of this function are all pointers to local variables
4023 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
4024 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
4026 If this function returns nonzero, it means that the comparison has
4027 a constant value. What this function returns is an expression for
4031 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
4032 tree *op0_ptr, *op1_ptr;
4034 enum tree_code *rescode_ptr;
4037 tree op0 = *op0_ptr;
4038 tree op1 = *op1_ptr;
4039 int unsignedp0, unsignedp1;
4041 tree primop0, primop1;
4042 enum tree_code code = *rescode_ptr;
4044 /* Throw away any conversions to wider types
4045 already present in the operands. */
4047 primop0 = get_narrower (op0, &unsignedp0);
4048 primop1 = get_narrower (op1, &unsignedp1);
4050 /* Handle the case that OP0 does not *contain* a conversion
4051 but it *requires* conversion to FINAL_TYPE. */
4053 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
4054 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
4055 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
4056 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
4058 /* If one of the operands must be floated, we cannot optimize. */
4059 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
4060 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
4062 /* If first arg is constant, swap the args (changing operation
4063 so value is preserved), for canonicalization. Don't do this if
4064 the second arg is 0. */
4066 if (TREE_CONSTANT (primop0)
4067 && ! integer_zerop (primop1) && ! real_zerop (primop1))
4069 register tree tem = primop0;
4070 register int temi = unsignedp0;
4078 unsignedp0 = unsignedp1;
4101 *rescode_ptr = code;
4104 /* If comparing an integer against a constant more bits wide,
4105 maybe we can deduce a value of 1 or 0 independent of the data.
4106 Or else truncate the constant now
4107 rather than extend the variable at run time.
4109 This is only interesting if the constant is the wider arg.
4110 Also, it is not safe if the constant is unsigned and the
4111 variable arg is signed, since in this case the variable
4112 would be sign-extended and then regarded as unsigned.
4113 Our technique fails in this case because the lowest/highest
4114 possible unsigned results don't follow naturally from the
4115 lowest/highest possible values of the variable operand.
4116 For just EQ_EXPR and NE_EXPR there is another technique that
4117 could be used: see if the constant can be faithfully represented
4118 in the other operand's type, by truncating it and reextending it
4119 and see if that preserves the constant's value. */
4121 if (!real1 && !real2
4122 && TREE_CODE (primop1) == INTEGER_CST
4123 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
4125 int min_gt, max_gt, min_lt, max_lt;
4126 tree maxval, minval;
4127 /* 1 if comparison is nominally unsigned. */
4128 int unsignedp = TREE_UNSIGNED (*restype_ptr);
4131 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
4133 /* If TYPE is an enumeration, then we need to get its min/max
4134 values from it's underlying integral type, not the enumerated
4136 if (TREE_CODE (type) == ENUMERAL_TYPE)
4137 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
4139 maxval = TYPE_MAX_VALUE (type);
4140 minval = TYPE_MIN_VALUE (type);
4142 if (unsignedp && !unsignedp0)
4143 *restype_ptr = signed_type (*restype_ptr);
4145 if (TREE_TYPE (primop1) != *restype_ptr)
4146 primop1 = convert (*restype_ptr, primop1);
4147 if (type != *restype_ptr)
4149 minval = convert (*restype_ptr, minval);
4150 maxval = convert (*restype_ptr, maxval);
4153 if (unsignedp && unsignedp0)
4155 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
4156 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
4157 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
4158 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
4162 min_gt = INT_CST_LT (primop1, minval);
4163 max_gt = INT_CST_LT (primop1, maxval);
4164 min_lt = INT_CST_LT (minval, primop1);
4165 max_lt = INT_CST_LT (maxval, primop1);
4169 /* This used to be a switch, but Genix compiler can't handle that. */
4170 if (code == NE_EXPR)
4172 if (max_lt || min_gt)
4173 val = boolean_true_node;
4175 else if (code == EQ_EXPR)
4177 if (max_lt || min_gt)
4178 val = boolean_false_node;
4180 else if (code == LT_EXPR)
4183 val = boolean_true_node;
4185 val = boolean_false_node;
4187 else if (code == GT_EXPR)
4190 val = boolean_true_node;
4192 val = boolean_false_node;
4194 else if (code == LE_EXPR)
4197 val = boolean_true_node;
4199 val = boolean_false_node;
4201 else if (code == GE_EXPR)
4204 val = boolean_true_node;
4206 val = boolean_false_node;
4209 /* If primop0 was sign-extended and unsigned comparison specd,
4210 we did a signed comparison above using the signed type bounds.
4211 But the comparison we output must be unsigned.
4213 Also, for inequalities, VAL is no good; but if the signed
4214 comparison had *any* fixed result, it follows that the
4215 unsigned comparison just tests the sign in reverse
4216 (positive values are LE, negative ones GE).
4217 So we can generate an unsigned comparison
4218 against an extreme value of the signed type. */
4220 if (unsignedp && !unsignedp0)
4227 primop1 = TYPE_MIN_VALUE (type);
4233 primop1 = TYPE_MAX_VALUE (type);
4240 type = unsigned_type (type);
4243 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
4245 /* This is the case of (char)x >?< 0x80, which people used to use
4246 expecting old C compilers to change the 0x80 into -0x80. */
4247 if (val == boolean_false_node)
4248 warning ("comparison is always false due to limited range of data type");
4249 if (val == boolean_true_node)
4250 warning ("comparison is always true due to limited range of data type");
4253 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
4255 /* This is the case of (unsigned char)x >?< -1 or < 0. */
4256 if (val == boolean_false_node)
4257 warning ("comparison is always false due to limited range of data type");
4258 if (val == boolean_true_node)
4259 warning ("comparison is always true due to limited range of data type");
4264 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
4265 if (TREE_SIDE_EFFECTS (primop0))
4266 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
4270 /* Value is not predetermined, but do the comparison
4271 in the type of the operand that is not constant.
4272 TYPE is already properly set. */
4274 else if (real1 && real2
4275 && (TYPE_PRECISION (TREE_TYPE (primop0))
4276 == TYPE_PRECISION (TREE_TYPE (primop1))))
4277 type = TREE_TYPE (primop0);
4279 /* If args' natural types are both narrower than nominal type
4280 and both extend in the same manner, compare them
4281 in the type of the wider arg.
4282 Otherwise must actually extend both to the nominal
4283 common type lest different ways of extending
4285 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
4287 else if (unsignedp0 == unsignedp1 && real1 == real2
4288 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
4289 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
4291 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
4292 type = signed_or_unsigned_type (unsignedp0
4293 || TREE_UNSIGNED (*restype_ptr),
4295 /* Make sure shorter operand is extended the right way
4296 to match the longer operand. */
4297 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
4299 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
4304 /* Here we must do the comparison on the nominal type
4305 using the args exactly as we received them. */
4306 type = *restype_ptr;
4310 if (!real1 && !real2 && integer_zerop (primop1)
4311 && TREE_UNSIGNED (*restype_ptr))
4317 /* All unsigned values are >= 0, so we warn if extra warnings
4318 are requested. However, if OP0 is a constant that is
4319 >= 0, the signedness of the comparison isn't an issue,
4320 so suppress the warning. */
4321 if (extra_warnings && !in_system_header
4322 && ! (TREE_CODE (primop0) == INTEGER_CST
4323 && ! TREE_OVERFLOW (convert (signed_type (type),
4325 warning ("comparison of unsigned expression >= 0 is always true");
4326 value = boolean_true_node;
4330 if (extra_warnings && !in_system_header
4331 && ! (TREE_CODE (primop0) == INTEGER_CST
4332 && ! TREE_OVERFLOW (convert (signed_type (type),
4334 warning ("comparison of unsigned expression < 0 is always false");
4335 value = boolean_false_node;
4344 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
4345 if (TREE_SIDE_EFFECTS (primop0))
4346 return build (COMPOUND_EXPR, TREE_TYPE (value),
4353 *op0_ptr = convert (type, primop0);
4354 *op1_ptr = convert (type, primop1);
4356 *restype_ptr = boolean_type_node;
4361 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
4362 or validate its data type for an `if' or `while' statement or ?..: exp.
4364 This preparation consists of taking the ordinary
4365 representation of an expression expr and producing a valid tree
4366 boolean expression describing whether expr is nonzero. We could
4367 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
4368 but we optimize comparisons, &&, ||, and !.
4370 The resulting type should always be `boolean_type_node'. */
4373 truthvalue_conversion (expr)
4376 if (TREE_CODE (expr) == ERROR_MARK)
4379 #if 0 /* This appears to be wrong for C++. */
4380 /* These really should return error_mark_node after 2.4 is stable.
4381 But not all callers handle ERROR_MARK properly. */
4382 switch (TREE_CODE (TREE_TYPE (expr)))
4385 error ("struct type value used where scalar is required");
4386 return boolean_false_node;
4389 error ("union type value used where scalar is required");
4390 return boolean_false_node;
4393 error ("array type value used where scalar is required");
4394 return boolean_false_node;
4401 switch (TREE_CODE (expr))
4404 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
4405 case TRUTH_ANDIF_EXPR:
4406 case TRUTH_ORIF_EXPR:
4407 case TRUTH_AND_EXPR:
4409 case TRUTH_XOR_EXPR:
4410 case TRUTH_NOT_EXPR:
4411 TREE_TYPE (expr) = boolean_type_node;
4418 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
4421 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
4424 /* If we are taking the address of a external decl, it might be zero
4425 if it is weak, so we cannot optimize. */
4426 if (DECL_P (TREE_OPERAND (expr, 0))
4427 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
4430 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
4431 return build (COMPOUND_EXPR, boolean_type_node,
4432 TREE_OPERAND (expr, 0), boolean_true_node);
4434 return boolean_true_node;
4437 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
4438 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
4439 truthvalue_conversion (TREE_OPERAND (expr, 0)),
4440 truthvalue_conversion (TREE_OPERAND (expr, 1)),
4447 /* These don't change whether an object is non-zero or zero. */
4448 return truthvalue_conversion (TREE_OPERAND (expr, 0));
4452 /* These don't change whether an object is zero or non-zero, but
4453 we can't ignore them if their second arg has side-effects. */
4454 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
4455 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
4456 truthvalue_conversion (TREE_OPERAND (expr, 0)));
4458 return truthvalue_conversion (TREE_OPERAND (expr, 0));
4461 /* Distribute the conversion into the arms of a COND_EXPR. */
4462 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
4463 truthvalue_conversion (TREE_OPERAND (expr, 1)),
4464 truthvalue_conversion (TREE_OPERAND (expr, 2))));
4467 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
4468 since that affects how `default_conversion' will behave. */
4469 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
4470 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
4472 /* fall through... */
4474 /* If this is widening the argument, we can ignore it. */
4475 if (TYPE_PRECISION (TREE_TYPE (expr))
4476 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
4477 return truthvalue_conversion (TREE_OPERAND (expr, 0));
4481 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
4483 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
4484 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
4486 /* fall through... */
4488 /* This and MINUS_EXPR can be changed into a comparison of the
4490 if (TREE_TYPE (TREE_OPERAND (expr, 0))
4491 == TREE_TYPE (TREE_OPERAND (expr, 1)))
4492 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
4493 TREE_OPERAND (expr, 1), 1);
4494 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
4495 fold (build1 (NOP_EXPR,
4496 TREE_TYPE (TREE_OPERAND (expr, 0)),
4497 TREE_OPERAND (expr, 1))), 1);
4500 if (integer_onep (TREE_OPERAND (expr, 1))
4501 && TREE_TYPE (expr) != boolean_type_node)
4502 /* Using convert here would cause infinite recursion. */
4503 return build1 (NOP_EXPR, boolean_type_node, expr);
4507 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
4508 warning ("suggest parentheses around assignment used as truth value");
4515 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
4517 tree tem = save_expr (expr);
4518 return (build_binary_op
4519 ((TREE_SIDE_EFFECTS (expr)
4520 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
4521 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
4522 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
4526 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
4530 /* Read the rest of a #-directive from input stream FINPUT.
4531 In normal use, the directive name and the white space after it
4532 have already been read, so they won't be included in the result.
4533 We allow for the fact that the directive line may contain
4534 a newline embedded within a character or string literal which forms
4535 a part of the directive.
4537 The value is a string in a reusable buffer. It remains valid
4538 only until the next time this function is called.
4540 The terminating character ('\n' or EOF) is left in FINPUT for the
4541 caller to re-read. */
4544 get_directive_line (finput)
4545 register FILE *finput;
4547 static char *directive_buffer = NULL;
4548 static unsigned buffer_length = 0;
4550 register char *buffer_limit;
4551 register int looking_for = 0;
4552 register int char_escaped = 0;
4554 if (buffer_length == 0)
4556 directive_buffer = (char *)xmalloc (128);
4557 buffer_length = 128;
4560 buffer_limit = &directive_buffer[buffer_length];
4562 for (p = directive_buffer; ; )
4566 /* Make buffer bigger if it is full. */
4567 if (p >= buffer_limit)
4569 register unsigned bytes_used = (p - directive_buffer);
4573 = (char *)xrealloc (directive_buffer, buffer_length);
4574 p = &directive_buffer[bytes_used];
4575 buffer_limit = &directive_buffer[buffer_length];
4580 /* Discard initial whitespace. */
4581 if ((c == ' ' || c == '\t') && p == directive_buffer)
4584 /* Detect the end of the directive. */
4585 if (looking_for == 0
4586 && (c == '\n' || c == EOF))
4595 return directive_buffer;
4597 /* Handle string and character constant syntax. */
4600 if (looking_for == c && !char_escaped)
4601 looking_for = 0; /* Found terminator... stop looking. */
4604 if (c == '\'' || c == '"')
4605 looking_for = c; /* Don't stop buffering until we see another
4606 one of these (or an EOF). */
4608 /* Handle backslash. */
4609 char_escaped = (c == '\\' && ! char_escaped);
4612 #endif /* USE_CPPLIB */
4614 /* Make a variant type in the proper way for C/C++, propagating qualifiers
4615 down to the element type of an array. */
4618 c_build_qualified_type (type, type_quals)
4622 /* A restrict-qualified pointer type must be a pointer to object or
4623 incomplete type. Note that the use of POINTER_TYPE_P also allows
4624 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
4625 the C++ front-end also use POINTER_TYPE for pointer-to-member
4626 values, so even though it should be illegal to use `restrict'
4627 with such an entity we don't flag that here. Thus, special case
4628 code for that case is required in the C++ front-end. */
4629 if ((type_quals & TYPE_QUAL_RESTRICT)
4630 && (!POINTER_TYPE_P (type)
4631 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
4633 error ("invalid use of `restrict'");
4634 type_quals &= ~TYPE_QUAL_RESTRICT;
4637 if (TREE_CODE (type) == ARRAY_TYPE)
4638 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
4640 TYPE_DOMAIN (type));
4641 return build_qualified_type (type, type_quals);
4644 /* Apply the TYPE_QUALS to the new DECL. */
4647 c_apply_type_quals_to_decl (type_quals, decl)
4651 if ((type_quals & TYPE_QUAL_CONST)
4652 || (TREE_TYPE (decl)
4653 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
4654 TREE_READONLY (decl) = 1;
4655 if (type_quals & TYPE_QUAL_VOLATILE)
4657 TREE_SIDE_EFFECTS (decl) = 1;
4658 TREE_THIS_VOLATILE (decl) = 1;
4660 if (type_quals & TYPE_QUAL_RESTRICT)
4662 if (!TREE_TYPE (decl)
4663 || !POINTER_TYPE_P (TREE_TYPE (decl))
4664 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
4665 error ("invalid use of `restrict'");
4666 else if (flag_strict_aliasing)
4668 /* No two restricted pointers can point at the same thing.
4669 However, a restricted pointer can point at the same thing
4670 as an unrestricted pointer, if that unrestricted pointer
4671 is based on the restricted pointer. So, we make the
4672 alias set for the restricted pointer a subset of the
4673 alias set for the type pointed to by the type of the
4676 HOST_WIDE_INT pointed_to_alias_set
4677 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
4679 if (pointed_to_alias_set == 0)
4680 /* It's not legal to make a subset of alias set zero. */
4684 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
4685 record_alias_subset (pointed_to_alias_set,
4686 DECL_POINTER_ALIAS_SET (decl));
4693 /* Return the typed-based alias set for T, which may be an expression
4694 or a type. Return -1 if we don't do anything special. */
4697 lang_get_alias_set (t)
4702 /* Permit type-punning when accessing a union, provided the access
4703 is directly through the union. For example, this code does not
4704 permit taking the address of a union member and then storing
4705 through it. Even the type-punning allowed here is a GCC
4706 extension, albeit a common and useful one; the C standard says
4707 that such accesses have implementation-defined behavior. */
4709 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
4710 u = TREE_OPERAND (u, 0))
4711 if (TREE_CODE (u) == COMPONENT_REF
4712 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
4715 /* If this is a char *, the ANSI C standard says it can alias
4716 anything. Note that all references need do this. */
4717 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
4718 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
4719 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
4722 /* That's all the expressions we handle specially. */
4726 /* The C standard specifically allows aliasing between signed and
4727 unsigned variants of the same type. We treat the signed
4728 variant as canonical. */
4729 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
4731 tree t1 = signed_type (t);
4733 /* t1 == t can happen for boolean nodes which are always unsigned. */
4735 return get_alias_set (t1);
4737 else if (POINTER_TYPE_P (t))
4741 /* Unfortunately, there is no canonical form of a pointer type.
4742 In particular, if we have `typedef int I', then `int *', and
4743 `I *' are different types. So, we have to pick a canonical
4744 representative. We do this below.
4746 Technically, this approach is actually more conservative that
4747 it needs to be. In particular, `const int *' and `int *'
4748 chould be in different alias sets, according to the C and C++
4749 standard, since their types are not the same, and so,
4750 technically, an `int **' and `const int **' cannot point at
4753 But, the standard is wrong. In particular, this code is
4758 const int* const* cipp = &ip;
4760 And, it doesn't make sense for that to be legal unless you
4761 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
4762 the pointed-to types. This issue has been reported to the
4764 t1 = TYPE_MAIN_VARIANT (TREE_TYPE (t));
4765 t1 = ((TREE_CODE (t) == POINTER_TYPE)
4766 ? build_pointer_type (t1) : build_reference_type (t1));
4768 return get_alias_set (t1);
4770 /* It's not yet safe to use alias sets for classes in C++ because
4771 the TYPE_FIELDs list for a class doesn't mention base classes. */
4772 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
4778 /* Build tree nodes and builtin functions common to both C and C++ language
4782 c_common_nodes_and_builtins ()
4785 tree memcpy_ftype, memset_ftype, strlen_ftype;
4786 tree bzero_ftype, bcmp_ftype, puts_ftype, printf_ftype;
4787 tree endlink, int_endlink, double_endlink, unsigned_endlink;
4788 tree sizetype_endlink;
4789 tree ptr_ftype, ptr_ftype_unsigned;
4790 tree void_ftype_any, void_ftype_int, int_ftype_any, sizet_ftype_any;
4791 tree double_ftype_double, double_ftype_double_double;
4792 tree float_ftype_float, ldouble_ftype_ldouble;
4793 tree int_ftype_cptr_cptr_sizet;
4794 tree int_ftype_string_string, string_ftype_ptr_ptr;
4795 tree long_ftype_long;
4796 tree longlong_ftype_longlong;
4797 /* Either char* or void*. */
4798 tree traditional_ptr_type_node;
4799 /* Either const char* or const void*. */
4800 tree traditional_cptr_type_node;
4801 tree traditional_len_type_node;
4802 tree traditional_len_endlink;
4803 tree va_list_ref_type_node;
4804 tree va_list_arg_type_node;
4806 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
4807 va_list_type_node));
4809 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
4810 ptrdiff_type_node));
4812 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
4815 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4817 va_list_arg_type_node = va_list_ref_type_node =
4818 build_pointer_type (TREE_TYPE (va_list_type_node));
4822 va_list_arg_type_node = va_list_type_node;
4823 va_list_ref_type_node = build_reference_type (va_list_type_node);
4826 endlink = void_list_node;
4827 int_endlink = tree_cons (NULL_TREE, integer_type_node, endlink);
4828 double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
4829 unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
4831 ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
4832 ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
4833 sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
4834 /* We realloc here because sizetype could be int or unsigned. S'ok. */
4835 ptr_ftype_sizetype = build_function_type (ptr_type_node, sizetype_endlink);
4837 sizet_ftype_any = build_function_type (sizetype, NULL_TREE);
4838 int_ftype_any = build_function_type (integer_type_node, NULL_TREE);
4839 void_ftype_any = build_function_type (void_type_node, NULL_TREE);
4840 void_ftype = build_function_type (void_type_node, endlink);
4841 void_ftype_int = build_function_type (void_type_node, int_endlink);
4843 = build_function_type (void_type_node,
4844 tree_cons (NULL_TREE, ptr_type_node, endlink));
4847 = build_function_type (float_type_node,
4848 tree_cons (NULL_TREE, float_type_node, endlink));
4851 = build_function_type (double_type_node, double_endlink);
4853 ldouble_ftype_ldouble
4854 = build_function_type (long_double_type_node,
4855 tree_cons (NULL_TREE, long_double_type_node,
4858 double_ftype_double_double
4859 = build_function_type (double_type_node,
4860 tree_cons (NULL_TREE, double_type_node,
4864 = build_function_type (integer_type_node, int_endlink);
4867 = build_function_type (long_integer_type_node,
4868 tree_cons (NULL_TREE, long_integer_type_node,
4871 longlong_ftype_longlong
4872 = build_function_type (long_long_integer_type_node,
4873 tree_cons (NULL_TREE, long_long_integer_type_node,
4876 int_ftype_cptr_cptr_sizet
4877 = build_function_type (integer_type_node,
4878 tree_cons (NULL_TREE, const_ptr_type_node,
4879 tree_cons (NULL_TREE, const_ptr_type_node,
4880 tree_cons (NULL_TREE,
4884 void_zero_node = build_int_2 (0, 0);
4885 TREE_TYPE (void_zero_node) = void_type_node;
4887 /* Prototype for strcpy. */
4888 string_ftype_ptr_ptr
4889 = build_function_type (string_type_node,
4890 tree_cons (NULL_TREE, string_type_node,
4891 tree_cons (NULL_TREE,
4892 const_string_type_node,
4895 traditional_len_type_node = ((flag_traditional &&
4896 c_language != clk_cplusplus)
4897 ? integer_type_node : sizetype);
4898 traditional_len_endlink = tree_cons (NULL_TREE, traditional_len_type_node,
4901 /* Prototype for strcmp. */
4902 int_ftype_string_string
4903 = build_function_type (integer_type_node,
4904 tree_cons (NULL_TREE, const_string_type_node,
4905 tree_cons (NULL_TREE,
4906 const_string_type_node,
4909 /* Prototype for strlen. */
4911 = build_function_type (traditional_len_type_node,
4912 tree_cons (NULL_TREE, const_string_type_node,
4915 traditional_ptr_type_node = ((flag_traditional &&
4916 c_language != clk_cplusplus)
4917 ? string_type_node : ptr_type_node);
4918 traditional_cptr_type_node = ((flag_traditional &&
4919 c_language != clk_cplusplus)
4920 ? const_string_type_node : const_ptr_type_node);
4922 /* Prototype for memcpy. */
4924 = build_function_type (traditional_ptr_type_node,
4925 tree_cons (NULL_TREE, ptr_type_node,
4926 tree_cons (NULL_TREE, const_ptr_type_node,
4927 sizetype_endlink)));
4929 /* Prototype for memset. */
4931 = build_function_type (traditional_ptr_type_node,
4932 tree_cons (NULL_TREE, ptr_type_node,
4933 tree_cons (NULL_TREE, integer_type_node,
4934 tree_cons (NULL_TREE,
4938 /* Prototype for bzero. */
4940 = build_function_type (void_type_node,
4941 tree_cons (NULL_TREE, traditional_ptr_type_node,
4942 traditional_len_endlink));
4944 /* Prototype for bcmp. */
4946 = build_function_type (integer_type_node,
4947 tree_cons (NULL_TREE, traditional_cptr_type_node,
4948 tree_cons (NULL_TREE,
4949 traditional_cptr_type_node,
4950 traditional_len_endlink)));
4952 /* Prototype for puts. */
4954 = build_function_type (integer_type_node,
4955 tree_cons (NULL_TREE, const_string_type_node,
4958 /* Prototype for printf. */
4960 = build_function_type (integer_type_node,
4961 tree_cons (NULL_TREE, const_string_type_node,
4964 builtin_function ("__builtin_constant_p", default_function_type,
4965 BUILT_IN_CONSTANT_P, BUILT_IN_NORMAL, NULL_PTR);
4967 builtin_function ("__builtin_return_address", ptr_ftype_unsigned,
4968 BUILT_IN_RETURN_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4970 builtin_function ("__builtin_frame_address", ptr_ftype_unsigned,
4971 BUILT_IN_FRAME_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
4973 builtin_function ("__builtin_alloca", ptr_ftype_sizetype,
4974 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, "alloca");
4975 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS,
4976 BUILT_IN_NORMAL, NULL_PTR);
4977 /* Define alloca, ffs as builtins.
4978 Declare _exit just to mark it as volatile. */
4979 if (! flag_no_builtin && ! flag_no_nonansi_builtin)
4982 temp = builtin_function ("alloca", ptr_ftype_sizetype,
4983 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
4984 /* Suppress error if redefined as a non-function. */
4985 DECL_BUILT_IN_NONANSI (temp) = 1;
4987 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
4988 BUILT_IN_NORMAL, NULL_PTR);
4989 /* Suppress error if redefined as a non-function. */
4990 DECL_BUILT_IN_NONANSI (temp) = 1;
4991 temp = builtin_function ("_exit", void_ftype_int,
4992 0, NOT_BUILT_IN, NULL_PTR);
4993 TREE_THIS_VOLATILE (temp) = 1;
4994 TREE_SIDE_EFFECTS (temp) = 1;
4995 /* Suppress error if redefined as a non-function. */
4996 DECL_BUILT_IN_NONANSI (temp) = 1;
4998 /* The system prototypes for these functions have many
4999 variations, so don't specify parameters to avoid conflicts.
5000 The expand_* functions check the argument types anyway. */
5001 temp = builtin_function ("bzero", void_ftype_any,
5002 BUILT_IN_BZERO, BUILT_IN_NORMAL, NULL_PTR);
5003 DECL_BUILT_IN_NONANSI (temp) = 1;
5004 temp = builtin_function ("bcmp", int_ftype_any,
5005 BUILT_IN_BCMP, BUILT_IN_NORMAL, NULL_PTR);
5006 DECL_BUILT_IN_NONANSI (temp) = 1;
5009 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS,
5010 BUILT_IN_NORMAL, NULL_PTR);
5011 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
5012 BUILT_IN_NORMAL, NULL_PTR);
5013 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
5014 BUILT_IN_NORMAL, NULL_PTR);
5015 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
5016 BUILT_IN_NORMAL, NULL_PTR);
5017 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
5018 BUILT_IN_NORMAL, NULL_PTR);
5019 builtin_function ("__builtin_llabs", longlong_ftype_longlong, BUILT_IN_LLABS,
5020 BUILT_IN_NORMAL, NULL_PTR);
5021 builtin_function ("__builtin_saveregs", ptr_ftype, BUILT_IN_SAVEREGS,
5022 BUILT_IN_NORMAL, NULL_PTR);
5023 builtin_function ("__builtin_classify_type", default_function_type,
5024 BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
5025 builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
5026 BUILT_IN_NORMAL, NULL_PTR);
5027 builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
5028 BUILT_IN_NORMAL, NULL_PTR);
5029 builtin_function ("__builtin_setjmp",
5030 build_function_type (integer_type_node,
5031 tree_cons (NULL_TREE, ptr_type_node,
5033 BUILT_IN_SETJMP, BUILT_IN_NORMAL, NULL_PTR);
5034 builtin_function ("__builtin_longjmp",
5035 build_function_type (void_type_node,
5036 tree_cons (NULL_TREE, ptr_type_node,
5037 tree_cons (NULL_TREE,
5040 BUILT_IN_LONGJMP, BUILT_IN_NORMAL, NULL_PTR);
5041 builtin_function ("__builtin_trap", void_ftype, BUILT_IN_TRAP,
5042 BUILT_IN_NORMAL, NULL_PTR);
5044 /* ISO C99 IEEE Unordered compares. */
5045 builtin_function ("__builtin_isgreater", default_function_type,
5046 BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
5047 builtin_function ("__builtin_isgreaterequal", default_function_type,
5048 BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
5049 builtin_function ("__builtin_isless", default_function_type,
5050 BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
5051 builtin_function ("__builtin_islessequal", default_function_type,
5052 BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
5053 builtin_function ("__builtin_islessgreater", default_function_type,
5054 BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
5055 builtin_function ("__builtin_isunordered", default_function_type,
5056 BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
5058 /* Untyped call and return. */
5059 builtin_function ("__builtin_apply_args", ptr_ftype,
5060 BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
5062 temp = tree_cons (NULL_TREE,
5063 build_pointer_type (build_function_type (void_type_node,
5065 tree_cons (NULL_TREE,
5067 tree_cons (NULL_TREE,
5070 builtin_function ("__builtin_apply",
5071 build_function_type (ptr_type_node, temp),
5072 BUILT_IN_APPLY, BUILT_IN_NORMAL, NULL_PTR);
5073 builtin_function ("__builtin_return", void_ftype_ptr,
5074 BUILT_IN_RETURN, BUILT_IN_NORMAL, NULL_PTR);
5076 /* Support for varargs.h and stdarg.h. */
5077 builtin_function ("__builtin_varargs_start",
5078 build_function_type (void_type_node,
5079 tree_cons (NULL_TREE,
5080 va_list_ref_type_node,
5082 BUILT_IN_VARARGS_START, BUILT_IN_NORMAL, NULL_PTR);
5084 builtin_function ("__builtin_stdarg_start",
5085 build_function_type (void_type_node,
5086 tree_cons (NULL_TREE,
5087 va_list_ref_type_node,
5089 BUILT_IN_STDARG_START, BUILT_IN_NORMAL, NULL_PTR);
5091 builtin_function ("__builtin_va_end",
5092 build_function_type (void_type_node,
5093 tree_cons (NULL_TREE,
5094 va_list_ref_type_node,
5096 BUILT_IN_VA_END, BUILT_IN_NORMAL, NULL_PTR);
5098 builtin_function ("__builtin_va_copy",
5099 build_function_type (void_type_node,
5100 tree_cons (NULL_TREE,
5101 va_list_ref_type_node,
5102 tree_cons (NULL_TREE,
5103 va_list_arg_type_node,
5105 BUILT_IN_VA_COPY, BUILT_IN_NORMAL, NULL_PTR);
5107 /* ??? Ought to be `T __builtin_expect(T, T)' for any type T. */
5108 builtin_function ("__builtin_expect",
5109 build_function_type (long_integer_type_node,
5110 tree_cons (NULL_TREE,
5111 long_integer_type_node,
5112 tree_cons (NULL_TREE,
5113 long_integer_type_node,
5115 BUILT_IN_EXPECT, BUILT_IN_NORMAL, NULL_PTR);
5117 /* Currently under experimentation. */
5118 builtin_function ("__builtin_memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
5119 BUILT_IN_NORMAL, "memcpy");
5120 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
5121 BUILT_IN_MEMCMP, BUILT_IN_NORMAL, "memcmp");
5122 builtin_function ("__builtin_memset", memset_ftype,
5123 BUILT_IN_MEMSET, BUILT_IN_NORMAL, "memset");
5124 builtin_function ("__builtin_bzero", bzero_ftype,
5125 BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
5126 builtin_function ("__builtin_bcmp", bcmp_ftype,
5127 BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");
5128 builtin_function ("__builtin_strcmp", int_ftype_string_string,
5129 BUILT_IN_STRCMP, BUILT_IN_NORMAL, "strcmp");
5130 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
5131 BUILT_IN_STRCPY, BUILT_IN_NORMAL, "strcpy");
5132 builtin_function ("__builtin_strlen", strlen_ftype,
5133 BUILT_IN_STRLEN, BUILT_IN_NORMAL, "strlen");
5134 builtin_function ("__builtin_sqrtf", float_ftype_float,
5135 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtf");
5136 builtin_function ("__builtin_fsqrt", double_ftype_double,
5137 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrt");
5138 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
5139 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtl");
5140 builtin_function ("__builtin_sinf", float_ftype_float,
5141 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinf");
5142 builtin_function ("__builtin_sin", double_ftype_double,
5143 BUILT_IN_SIN, BUILT_IN_NORMAL, "sin");
5144 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
5145 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinl");
5146 builtin_function ("__builtin_cosf", float_ftype_float,
5147 BUILT_IN_COS, BUILT_IN_NORMAL, "cosf");
5148 builtin_function ("__builtin_cos", double_ftype_double,
5149 BUILT_IN_COS, BUILT_IN_NORMAL, "cos");
5150 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
5151 BUILT_IN_COS, BUILT_IN_NORMAL, "cosl");
5152 built_in_decls[BUILT_IN_PUTCHAR] =
5153 builtin_function ("__builtin_putchar", int_ftype_int,
5154 BUILT_IN_PUTCHAR, BUILT_IN_NORMAL, "putchar");
5155 built_in_decls[BUILT_IN_PUTS] =
5156 builtin_function ("__builtin_puts", puts_ftype,
5157 BUILT_IN_PUTS, BUILT_IN_NORMAL, "puts");
5158 builtin_function ("__builtin_printf", printf_ftype,
5159 BUILT_IN_PRINTF, BUILT_IN_FRONTEND, "printf");
5160 /* We declare these without argument so that the initial declaration
5161 for these identifiers is a builtin. That allows us to redeclare
5162 them later with argument without worrying about the explicit
5163 declarations in stdio.h being taken as the initial declaration.
5164 Also, save the _DECL for these so we can use them later. */
5165 built_in_decls[BUILT_IN_FWRITE] =
5166 builtin_function ("__builtin_fwrite", sizet_ftype_any,
5167 BUILT_IN_FWRITE, BUILT_IN_NORMAL, "fwrite");
5168 built_in_decls[BUILT_IN_FPUTC] =
5169 builtin_function ("__builtin_fputc", int_ftype_any,
5170 BUILT_IN_FPUTC, BUILT_IN_NORMAL, "fputc");
5171 built_in_decls[BUILT_IN_FPUTS] =
5172 builtin_function ("__builtin_fputs", int_ftype_any,
5173 BUILT_IN_FPUTS, BUILT_IN_NORMAL, "fputs");
5175 if (! flag_no_builtin)
5177 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS,
5178 BUILT_IN_NORMAL, NULL_PTR);
5179 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS,
5180 BUILT_IN_NORMAL, NULL_PTR);
5181 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS,
5182 BUILT_IN_NORMAL, NULL_PTR);
5183 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
5184 BUILT_IN_NORMAL, NULL_PTR);
5185 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS,
5186 BUILT_IN_NORMAL, NULL_PTR);
5187 if (flag_isoc99 || ! flag_no_nonansi_builtin)
5188 builtin_function ("llabs", longlong_ftype_longlong, BUILT_IN_LLABS,
5189 BUILT_IN_NORMAL, NULL_PTR);
5190 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
5191 BUILT_IN_NORMAL, NULL_PTR);
5192 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
5193 BUILT_IN_NORMAL, NULL_PTR);
5194 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET,
5195 BUILT_IN_NORMAL, NULL_PTR);
5196 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
5197 BUILT_IN_NORMAL, NULL_PTR);
5198 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
5199 BUILT_IN_NORMAL, NULL_PTR);
5200 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN,
5201 BUILT_IN_NORMAL, NULL_PTR);
5202 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT,
5203 BUILT_IN_NORMAL, NULL_PTR);
5204 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT,
5205 BUILT_IN_NORMAL, NULL_PTR);
5206 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
5207 BUILT_IN_NORMAL, NULL_PTR);
5208 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN,
5209 BUILT_IN_NORMAL, NULL_PTR);
5210 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN,
5211 BUILT_IN_NORMAL, NULL_PTR);
5212 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN,
5213 BUILT_IN_NORMAL, NULL_PTR);
5214 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS,
5215 BUILT_IN_NORMAL, NULL_PTR);
5216 builtin_function ("cos", double_ftype_double, BUILT_IN_COS,
5217 BUILT_IN_NORMAL, NULL_PTR);
5218 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS,
5219 BUILT_IN_NORMAL, NULL_PTR);
5220 builtin_function ("printf", printf_ftype, BUILT_IN_PRINTF,
5221 BUILT_IN_FRONTEND, NULL_PTR);
5222 /* We declare these without argument so that the initial
5223 declaration for these identifiers is a builtin. That allows
5224 us to redeclare them later with argument without worrying
5225 about the explicit declarations in stdio.h being taken as the
5226 initial declaration. */
5227 builtin_function ("fputc", int_ftype_any, BUILT_IN_FPUTC,
5228 BUILT_IN_NORMAL, NULL_PTR);
5229 builtin_function ("fputs", int_ftype_any, BUILT_IN_FPUTS,
5230 BUILT_IN_NORMAL, NULL_PTR);
5232 /* Declare these functions volatile
5233 to avoid spurious "control drops through" warnings. */
5234 temp = builtin_function ("abort",
5235 ((c_language == clk_cplusplus)
5236 ? void_ftype : void_ftype_any),
5237 0, NOT_BUILT_IN, NULL_PTR);
5238 TREE_THIS_VOLATILE (temp) = 1;
5239 TREE_SIDE_EFFECTS (temp) = 1;
5241 temp = builtin_function ("exit",
5242 ((c_language == clk_cplusplus)
5243 ? void_ftype_int : void_ftype_any),
5244 0, NOT_BUILT_IN, NULL_PTR);
5245 TREE_THIS_VOLATILE (temp) = 1;
5246 TREE_SIDE_EFFECTS (temp) = 1;
5250 /* Support for these has not been written in either expand_builtin
5251 or build_function_call. */
5252 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV,
5253 BUILT_IN_NORMAL, NULL_PTR);
5254 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV,
5255 BUILT_IN_NORMAL, NULL_PTR);
5256 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
5257 BUILT_IN_NORMAL, NULL_PTR);
5258 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
5259 BUILT_IN_NORMAL, NULL_PTR);
5260 builtin_function ("__builtin_fmod", double_ftype_double_double,
5261 BUILT_IN_FMOD, BUILT_IN_NORMAL, NULL_PTR);
5262 builtin_function ("__builtin_frem", double_ftype_double_double,
5263 BUILT_IN_FREM, BUILT_IN_NORMAL, NULL_PTR);
5264 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
5265 BUILT_IN_NORMAL, NULL_PTR);
5266 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
5267 BUILT_IN_NORMAL, NULL_PTR);
5270 main_identifier_node = get_identifier ("main");
5272 /* ??? Perhaps there's a better place to do this. But it is related
5273 to __builtin_va_arg, so it isn't that off-the-wall. */
5274 lang_type_promotes_to = simple_type_promotes_to;
5278 build_va_arg (expr, type)
5281 return build1 (VA_ARG_EXPR, type, expr);
5284 /* Given a type, apply default promotions wrt unnamed function arguments
5285 and return the new type. Return NULL_TREE if no change. */
5286 /* ??? There is a function of the same name in the C++ front end that
5287 does something similar, but is more thorough and does not return NULL
5288 if no change. We could perhaps share code, but it would make the
5289 self_promoting_type property harder to identify. */
5292 simple_type_promotes_to (type)
5295 if (TYPE_MAIN_VARIANT (type) == float_type_node)
5296 return double_type_node;
5298 if (C_PROMOTING_INTEGER_TYPE_P (type))
5300 /* Traditionally, unsignedness is preserved in default promotions.
5301 Also preserve unsignedness if not really getting any wider. */
5302 if (TREE_UNSIGNED (type)
5303 && (flag_traditional
5304 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
5305 return unsigned_type_node;
5306 return integer_type_node;
5312 /* Return 1 if PARMS specifies a fixed number of parameters
5313 and none of their types is affected by default promotions. */
5316 self_promoting_args_p (parms)
5320 for (t = parms; t; t = TREE_CHAIN (t))
5322 register tree type = TREE_VALUE (t);
5324 if (TREE_CHAIN (t) == 0 && type != void_type_node)
5330 if (TYPE_MAIN_VARIANT (type) == float_type_node)
5333 if (C_PROMOTING_INTEGER_TYPE_P (type))
5339 /* Recognize certain built-in functions so we can make tree-codes
5340 other than CALL_EXPR. We do this when it enables fold-const.c
5341 to do something useful. */
5342 /* ??? By rights this should go in builtins.c, but only C and C++
5343 implement build_{binary,unary}_op. Not exactly sure what bits
5344 of functionality are actually needed from those functions, or
5345 where the similar functionality exists in the other front ends. */
5348 expand_tree_builtin (function, params, coerced_params)
5349 tree function, params, coerced_params;
5351 enum tree_code code;
5353 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
5356 switch (DECL_FUNCTION_CODE (function))
5360 case BUILT_IN_LLABS:
5362 if (coerced_params == 0)
5363 return integer_zero_node;
5364 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
5366 case BUILT_IN_ISGREATER:
5367 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
5373 case BUILT_IN_ISGREATEREQUAL:
5374 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
5380 case BUILT_IN_ISLESS:
5381 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
5387 case BUILT_IN_ISLESSEQUAL:
5388 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
5394 case BUILT_IN_ISLESSGREATER:
5395 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
5401 case BUILT_IN_ISUNORDERED:
5402 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
5403 return integer_zero_node;
5404 code = UNORDERED_EXPR;
5412 || TREE_CHAIN (params) == 0)
5414 error ("too few arguments to function `%s'",
5415 IDENTIFIER_POINTER (DECL_NAME (function)));
5416 return error_mark_node;
5418 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
5420 error ("too many arguments to function `%s'",
5421 IDENTIFIER_POINTER (DECL_NAME (function)));
5422 return error_mark_node;
5425 arg0 = TREE_VALUE (params);
5426 arg1 = TREE_VALUE (TREE_CHAIN (params));
5427 arg0 = build_binary_op (code, arg0, arg1, 0);
5428 if (code != UNORDERED_EXPR)
5429 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
5441 /* Returns non-zero if CODE is the code for a statement. */
5444 statement_code_p (code)
5445 enum tree_code code;
5468 if (lang_statement_code_p)
5469 return (*lang_statement_code_p) (code);
5474 /* Walk the statemen tree, rooted at *tp. Apply FUNC to all the
5475 sub-trees of *TP in a pre-order traversal. FUNC is called with the
5476 DATA and the address of each sub-tree. If FUNC returns a non-NULL
5477 value, the traversal is aborted, and the value returned by FUNC is
5478 returned. If FUNC sets WALK_SUBTREES to zero, then the subtrees of
5479 the node being visited are not walked.
5481 We don't need a without_duplicates variant of this one because the
5482 statement tree is a tree, not a graph. */
5485 walk_stmt_tree (tp, func, data)
5490 enum tree_code code;
5495 #define WALK_SUBTREE(NODE) \
5498 result = walk_stmt_tree (&(NODE), func, data); \
5504 /* Skip empty subtrees. */
5508 /* Skip subtrees below non-statement nodes. */
5509 if (!statement_code_p (TREE_CODE (*tp)))
5512 /* Call the function. */
5514 result = (*func) (tp, &walk_subtrees, data);
5516 /* If we found something, return it. */
5520 /* Even if we didn't, FUNC may have decided that there was nothing
5521 interesting below this point in the tree. */
5525 /* FUNC may have modified the tree, recheck that we're looking at a
5527 code = TREE_CODE (*tp);
5528 if (!statement_code_p (code))
5531 /* Walk over all the sub-trees of this operand. Statement nodes never
5532 contain RTL, and we needn't worry about TARGET_EXPRs. */
5533 len = TREE_CODE_LENGTH (code);
5535 /* Go through the subtrees. We need to do this in forward order so
5536 that the scope of a FOR_EXPR is handled properly. */
5537 for (i = 0; i < len; ++i)
5538 WALK_SUBTREE (TREE_OPERAND (*tp, i));
5540 /* Finally visit the chain. This can be tail-recursion optimized if
5541 we write it this way. */
5542 return walk_stmt_tree (&TREE_CHAIN (*tp), func, data);
5547 /* Used to compare case labels. K1 and K2 are actually tree nodes
5548 representing case labels, or NULL_TREE for a `default' label.
5549 Returns -1 if K1 is ordered before K2, -1 if K1 is ordered after
5550 K2, and 0 if K1 and K2 are equal. */
5553 case_compare (k1, k2)
5557 /* Consider a NULL key (such as arises with a `default' label) to be
5558 smaller than anything else. */
5564 return tree_int_cst_compare ((tree) k1, (tree) k2);
5567 /* Process a case label for the range LOW_VALUE ... HIGH_VALUE. If
5568 LOW_VALUE and HIGH_VALUE are both NULL_TREE then this case label is
5569 actually a `default' label. If only HIGH_VALUE is NULL_TREE, then
5570 case label was declared using the usual C/C++ syntax, rather than
5571 the GNU case range extension. CASES is a tree containing all the
5572 case ranges processed so far; COND is the condition for the
5573 switch-statement itself. Returns the CASE_LABEL created, or
5574 ERROR_MARK_NODE if no CASE_LABEL is created. */
5577 c_add_case_label (cases, cond, low_value, high_value)
5586 splay_tree_node node;
5588 /* Create the LABEL_DECL itself. */
5589 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
5590 DECL_CONTEXT (label) = current_function_decl;
5592 /* If there was an error processing the switch condition, bail now
5593 before we get more confused. */
5594 if (!cond || cond == error_mark_node)
5596 /* Add a label anyhow so that the back-end doesn't think that
5597 the beginning of the switch is unreachable. */
5599 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5600 return error_mark_node;
5603 if ((low_value && TREE_TYPE (low_value)
5604 && POINTER_TYPE_P (TREE_TYPE (low_value)))
5605 || (high_value && TREE_TYPE (high_value)
5606 && POINTER_TYPE_P (TREE_TYPE (high_value))))
5607 error ("pointers are not permitted as case values");
5609 /* Case ranges are a GNU extension. */
5610 if (high_value && pedantic)
5612 if (c_language == clk_cplusplus)
5613 pedwarn ("ISO C++ forbids range expressions in switch statements");
5615 pedwarn ("ISO C forbids range expressions in switch statements");
5618 type = TREE_TYPE (cond);
5621 low_value = check_case_value (low_value);
5622 low_value = convert_and_check (type, low_value);
5626 high_value = check_case_value (high_value);
5627 high_value = convert_and_check (type, high_value);
5630 /* If an error has occurred, bail out now. */
5631 if (low_value == error_mark_node || high_value == error_mark_node)
5634 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5635 return error_mark_node;
5638 /* If the LOW_VALUE and HIGH_VALUE are the same, then this isn't
5639 really a case range, even though it was written that way. Remove
5640 the HIGH_VALUE to simplify later processing. */
5641 if (tree_int_cst_equal (low_value, high_value))
5642 high_value = NULL_TREE;
5643 if (low_value && high_value
5644 && !tree_int_cst_lt (low_value, high_value))
5645 warning ("empty range specified");
5647 /* Look up the LOW_VALUE in the table of case labels we already
5649 node = splay_tree_lookup (cases, (splay_tree_key) low_value);
5650 /* If there was not an exact match, check for overlapping ranges.
5651 There's no need to do this if there's no LOW_VALUE or HIGH_VALUE;
5652 that's a `default' label and the only overlap is an exact match. */
5653 if (!node && (low_value || high_value))
5655 splay_tree_node low_bound;
5656 splay_tree_node high_bound;
5658 /* Even though there wasn't an exact match, there might be an
5659 overlap between this case range and another case range.
5660 Since we've (inductively) not allowed any overlapping case
5661 ranges, we simply need to find the greatest low case label
5662 that is smaller that LOW_VALUE, and the smallest low case
5663 label that is greater than LOW_VALUE. If there is an overlap
5664 it will occur in one of these two ranges. */
5665 low_bound = splay_tree_predecessor (cases,
5666 (splay_tree_key) low_value);
5667 high_bound = splay_tree_successor (cases,
5668 (splay_tree_key) low_value);
5670 /* Check to see if the LOW_BOUND overlaps. It is smaller than
5671 the LOW_VALUE, so there is no need to check unless the
5672 LOW_BOUND is in fact itself a case range. */
5674 && CASE_HIGH ((tree) low_bound->value)
5675 && tree_int_cst_compare (CASE_HIGH ((tree) low_bound->value),
5678 /* Check to see if the HIGH_BOUND overlaps. The low end of that
5679 range is bigger than the low end of the current range, so we
5680 are only interested if the current range is a real range, and
5681 not an ordinary case label. */
5684 && (tree_int_cst_compare ((tree) high_bound->key,
5689 /* If there was an overlap, issue an error. */
5692 tree duplicate = CASE_LABEL_DECL ((tree) node->value);
5696 error ("duplicate (or overlapping) case value");
5697 error_with_decl (duplicate,
5698 "this is the first entry overlapping that value");
5702 error ("duplicate case value") ;
5703 error_with_decl (duplicate, "previously used here");
5707 error ("multiple default labels in one switch");
5708 error_with_decl (duplicate, "this is the first default label");
5711 add_stmt (build_case_label (NULL_TREE, NULL_TREE, label));
5714 /* Add a CASE_LABEL to the statement-tree. */
5715 case_label = add_stmt (build_case_label (low_value, high_value, label));
5716 /* Register this case label in the splay tree. */
5717 splay_tree_insert (cases,
5718 (splay_tree_key) low_value,
5719 (splay_tree_value) case_label);
5724 /* Mark P (a stmt_tree) for GC. The use of a `void *' for the
5725 parameter allows this function to be used as a GC-marking
5732 stmt_tree st = (stmt_tree) p;
5734 ggc_mark_tree (st->x_last_stmt);
5735 ggc_mark_tree (st->x_last_expr_type);
5738 /* Mark LD for GC. */
5741 c_mark_lang_decl (c)
5742 struct c_lang_decl *c;
5744 ggc_mark_tree (c->saved_tree);
5747 /* Mark F for GC. */
5750 mark_c_language_function (f)
5751 struct language_function *f;
5756 mark_stmt_tree (&f->x_stmt_tree);
5757 ggc_mark_tree (f->x_scope_stmt_stack);
5760 /* Hook used by expand_expr to expand language-specific tree codes. */
5763 c_expand_expr (exp, target, tmode, modifier)
5766 enum machine_mode tmode;
5767 enum expand_modifier modifier;
5769 switch (TREE_CODE (exp))
5776 /* Since expand_expr_stmt calls free_temp_slots after every
5777 expression statement, we must call push_temp_slots here.
5778 Otherwise, any temporaries in use now would be considered
5779 out-of-scope after the first EXPR_STMT from within the
5782 rtl_expr = expand_start_stmt_expr ();
5783 expand_stmt (STMT_EXPR_STMT (exp));
5784 expand_end_stmt_expr (rtl_expr);
5785 result = expand_expr (rtl_expr, target, tmode, modifier);
5793 if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
5794 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5796 && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5797 && (DECL_BUILT_IN_CLASS (TREE_OPERAND (TREE_OPERAND (exp, 0), 0))
5798 == BUILT_IN_FRONTEND))
5799 return c_expand_builtin (exp, target, tmode, modifier);
5813 /* Hook used by safe_from_p to handle language-specific tree codes. */
5816 c_safe_from_p (target, exp)
5820 /* We can see statements here when processing the body of a
5821 statement-expression. For a declaration statement declaring a
5822 variable, look at the variable's initializer. */
5823 if (TREE_CODE (exp) == DECL_STMT)
5825 tree decl = DECL_STMT_DECL (exp);
5827 if (TREE_CODE (decl) == VAR_DECL
5828 && DECL_INITIAL (decl)
5829 && !safe_from_p (target, DECL_INITIAL (decl), /*top_p=*/0))
5833 /* For any statement, we must follow the statement-chain. */
5834 if (statement_code_p (TREE_CODE (exp)) && TREE_CHAIN (exp))
5835 return safe_from_p (target, TREE_CHAIN (exp), /*top_p=*/0);
5837 /* Assume everything else is safe. */
5841 /* Tree code classes. */
5843 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
5845 static char c_tree_code_type[] = {
5847 #include "c-common.def"
5851 /* Table indexed by tree code giving number of expression
5852 operands beyond the fixed part of the node structure.
5853 Not used for types or decls. */
5855 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
5857 static int c_tree_code_length[] = {
5859 #include "c-common.def"
5863 /* Names of tree components.
5864 Used for printing out the tree and error messages. */
5865 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
5867 static const char *c_tree_code_name[] = {
5869 #include "c-common.def"
5873 /* Adds the tree codes specific to the C front end to the list of all
5879 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
5881 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
5882 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
5884 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
5885 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
5887 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));
5890 #define CALLED_AS_BUILT_IN(NODE) \
5891 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
5894 c_expand_builtin (exp, target, tmode, modifier)
5897 enum machine_mode tmode;
5898 enum expand_modifier modifier;
5900 tree type = TREE_TYPE (exp);
5901 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
5902 tree arglist = TREE_OPERAND (exp, 1);
5903 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
5904 enum tree_code code = TREE_CODE (exp);
5905 const int ignore = (target == const0_rtx
5906 || ((code == NON_LVALUE_EXPR || code == NOP_EXPR
5907 || code == CONVERT_EXPR || code == REFERENCE_EXPR
5908 || code == COND_EXPR)
5909 && TREE_CODE (type) == VOID_TYPE));
5911 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl))
5912 return expand_call (exp, target, ignore);
5916 case BUILT_IN_PRINTF:
5917 target = c_expand_builtin_printf (arglist, target, tmode,
5923 default: /* just do library call, if unknown builtin */
5924 error ("built-in function `%s' not currently supported",
5925 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
5928 /* The switch statement above can drop through to cause the function
5929 to be called normally. */
5930 return expand_call (exp, target, ignore);
5933 /* Check an arglist to *printf for problems. The arglist should start
5934 at the format specifier, with the remaining arguments immediately
5937 is_valid_printf_arglist (arglist)
5940 /* Save this value so we can restore it later. */
5941 const int SAVE_pedantic = pedantic;
5942 int diagnostic_occurred = 0;
5944 /* Set this to a known value so the user setting won't affect code
5947 /* Check to make sure there are no format specifier errors. */
5948 check_function_format (&diagnostic_occurred,
5949 maybe_get_identifier("printf"),
5950 NULL_TREE, arglist);
5952 /* Restore the value of `pedantic'. */
5953 pedantic = SAVE_pedantic;
5955 /* If calling `check_function_format_ptr' produces a warning, we
5956 return false, otherwise we return true. */
5957 return ! diagnostic_occurred;
5960 /* If the arguments passed to printf are suitable for optimizations,
5961 we attempt to transform the call. */
5963 c_expand_builtin_printf (arglist, target, tmode, modifier, ignore)
5966 enum machine_mode tmode;
5967 enum expand_modifier modifier;
5970 tree fn_putchar = built_in_decls[BUILT_IN_PUTCHAR],
5971 fn_puts = built_in_decls[BUILT_IN_PUTS];
5972 tree fn, format_arg, stripped_string;
5974 /* If the return value is used, or the replacement _DECL isn't
5975 initialized, don't do the transformation. */
5976 if (!ignore || !fn_putchar || !fn_puts)
5979 /* Verify the required arguments in the original call. */
5981 || (TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE))
5984 /* Check the specifier vs. the parameters. */
5985 if (!is_valid_printf_arglist (arglist))
5988 format_arg = TREE_VALUE (arglist);
5989 stripped_string = format_arg;
5990 STRIP_NOPS (stripped_string);
5991 if (stripped_string && TREE_CODE (stripped_string) == ADDR_EXPR)
5992 stripped_string = TREE_OPERAND (stripped_string, 0);
5994 /* If the format specifier isn't a STRING_CST, punt. */
5995 if (TREE_CODE (stripped_string) != STRING_CST)
5998 /* OK! We can attempt optimization. */
6000 /* If the format specifier was "%s\n", call __builtin_puts(arg2). */
6001 if (strcmp (TREE_STRING_POINTER (stripped_string), "%s\n") == 0)
6003 arglist = TREE_CHAIN (arglist);
6006 /* If the format specifier was "%c", call __builtin_putchar (arg2). */
6007 else if (strcmp (TREE_STRING_POINTER (stripped_string), "%c") == 0)
6009 arglist = TREE_CHAIN (arglist);
6014 /* We can't handle anything else with % args or %% ... yet. */
6015 if (strchr (TREE_STRING_POINTER (stripped_string), '%'))
6018 /* If the resulting constant string has a length of 1, call
6019 putchar. Note, TREE_STRING_LENGTH includes the terminating
6020 NULL in its count. */
6021 if (TREE_STRING_LENGTH (stripped_string) == 2)
6023 /* Given printf("c"), (where c is any one character,)
6024 convert "c"[0] to an int and pass that to the replacement
6026 arglist = build_int_2 (TREE_STRING_POINTER (stripped_string)[0], 0);
6027 arglist = build_tree_list (NULL_TREE, arglist);
6031 /* If the resulting constant was "string\n", call
6032 __builtin_puts("string"). Ensure "string" has at least one
6033 character besides the trailing \n. Note, TREE_STRING_LENGTH
6034 includes the terminating NULL in its count. */
6035 else if (TREE_STRING_LENGTH (stripped_string) > 2
6036 && TREE_STRING_POINTER (stripped_string)
6037 [TREE_STRING_LENGTH (stripped_string) - 2] == '\n')
6039 /* Create a NULL-terminated string that's one char shorter
6040 than the original, stripping off the trailing '\n'. */
6041 const int newlen = TREE_STRING_LENGTH (stripped_string) - 1;
6042 char *newstr = (char *) alloca (newlen);
6043 memcpy (newstr, TREE_STRING_POINTER (stripped_string), newlen - 1);
6044 newstr[newlen - 1] = 0;
6046 arglist = combine_strings (build_string (newlen, newstr));
6047 arglist = build_tree_list (NULL_TREE, arglist);
6051 /* We'd like to arrange to call fputs(string) here, but we
6052 need stdout and don't have a way to get it ... yet. */
6056 return expand_expr (build_function_call (fn, arglist),
6057 (ignore ? const0_rtx : target),