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. */
38 cpp_options parse_options;
39 enum cpp_token cpp_token;
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.
135 tree c_global_trees[CTI_MAX];
137 /* The elements of `ridpointers' are identifier nodes for the reserved
138 type names and storage classes. It is indexed by a RID_... value. */
141 tree (*make_fname_decl) PARAMS ((tree, const char *, int));
143 /* Nonzero means the expression being parsed will never be evaluated.
144 This is a count, since unevaluated expressions can nest. */
147 enum attrs {A_PACKED, A_NOCOMMON, A_COMMON, A_NORETURN, A_CONST, A_T_UNION,
148 A_NO_CHECK_MEMORY_USAGE, A_NO_INSTRUMENT_FUNCTION,
149 A_CONSTRUCTOR, A_DESTRUCTOR, A_MODE, A_SECTION, A_ALIGNED,
150 A_UNUSED, A_FORMAT, A_FORMAT_ARG, A_WEAK, A_ALIAS, A_MALLOC,
151 A_NO_LIMIT_STACK, A_PURE};
153 enum format_type { printf_format_type, scanf_format_type,
154 strftime_format_type };
156 static void add_attribute PARAMS ((enum attrs, const char *,
158 static void init_attributes PARAMS ((void));
159 static void record_function_format PARAMS ((tree, tree, enum format_type,
161 static void record_international_format PARAMS ((tree, tree, int));
162 static int default_valid_lang_attribute PARAMS ((tree, tree, tree, tree));
164 /* Keep a stack of if statements. We record the number of compound
165 statements seen up to the if keyword, as well as the line number
166 and file of the if. If a potentially ambiguous else is seen, that
167 fact is recorded; the warning is issued when we can be sure that
168 the enclosing if statement does not have an else branch. */
176 static void tfaff PARAMS ((void));
178 static if_elt *if_stack;
180 /* Amount of space in the if statement stack. */
181 static int if_stack_space = 0;
184 static int if_stack_pointer = 0;
186 /* Generate RTL for the start of an if-then, and record the start of it
187 for ambiguous else detection. */
190 c_expand_start_cond (cond, exitflag, compstmt_count)
195 /* Make sure there is enough space on the stack. */
196 if (if_stack_space == 0)
199 if_stack = (if_elt *)xmalloc (10 * sizeof (if_elt));
201 else if (if_stack_space == if_stack_pointer)
203 if_stack_space += 10;
204 if_stack = (if_elt *)xrealloc (if_stack, if_stack_space * sizeof (if_elt));
207 /* Record this if statement. */
208 if_stack[if_stack_pointer].compstmt_count = compstmt_count;
209 if_stack[if_stack_pointer].file = input_filename;
210 if_stack[if_stack_pointer].line = lineno;
211 if_stack[if_stack_pointer].needs_warning = 0;
214 expand_start_cond (cond, exitflag);
217 /* Generate RTL for the end of an if-then. Optionally warn if a nested
218 if statement had an ambiguous else clause. */
224 if (if_stack[if_stack_pointer].needs_warning)
225 warning_with_file_and_line (if_stack[if_stack_pointer].file,
226 if_stack[if_stack_pointer].line,
227 "suggest explicit braces to avoid ambiguous `else'");
231 /* Generate RTL between the then-clause and the else-clause
232 of an if-then-else. */
235 c_expand_start_else ()
237 /* An ambiguous else warning must be generated for the enclosing if
238 statement, unless we see an else branch for that one, too. */
240 && if_stack_pointer > 1
241 && (if_stack[if_stack_pointer - 1].compstmt_count
242 == if_stack[if_stack_pointer - 2].compstmt_count))
243 if_stack[if_stack_pointer - 2].needs_warning = 1;
245 /* Even if a nested if statement had an else branch, it can't be
246 ambiguous if this one also has an else. So don't warn in that
247 case. Also don't warn for any if statements nested in this else. */
248 if_stack[if_stack_pointer - 1].needs_warning = 0;
249 if_stack[if_stack_pointer - 1].compstmt_count--;
251 expand_start_else ();
254 /* Make bindings for __FUNCTION__, __PRETTY_FUNCTION__, and __func__. */
257 declare_function_name ()
259 const char *name, *printable_name;
261 if (current_function_decl == NULL)
264 printable_name = "top level";
268 /* Allow functions to be nameless (such as artificial ones). */
269 if (DECL_NAME (current_function_decl))
270 name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
273 printable_name = (*decl_printable_name) (current_function_decl, 2);
276 (*make_fname_decl) (get_identifier ("__FUNCTION__"), name, 0);
277 (*make_fname_decl) (get_identifier ("__PRETTY_FUNCTION__"), printable_name, 1);
278 /* The ISO C people "of course" couldn't use __FUNCTION__ in the
279 ISO C 99 standard; instead a new variable is invented. */
280 (*make_fname_decl) (get_identifier ("__func__"), name, 0);
283 /* Given a chain of STRING_CST nodes,
284 concatenate them into one STRING_CST
285 and give it a suitable array-of-chars data type. */
288 combine_strings (strings)
291 register tree value, t;
292 register int length = 1;
295 int wchar_bytes = TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT;
297 const int nchars_max = flag_isoc99 ? 4095 : 509;
299 if (TREE_CHAIN (strings))
301 /* More than one in the chain, so concatenate. */
302 register char *p, *q;
304 /* Don't include the \0 at the end of each substring,
305 except for the last one.
306 Count wide strings and ordinary strings separately. */
307 for (t = strings; t; t = TREE_CHAIN (t))
309 if (TREE_TYPE (t) == wchar_array_type_node)
311 wide_length += (TREE_STRING_LENGTH (t) - wchar_bytes);
315 length += (TREE_STRING_LENGTH (t) - 1);
318 /* If anything is wide, the non-wides will be converted,
319 which makes them take more space. */
321 length = length * wchar_bytes + wide_length;
323 p = ggc_alloc_string (NULL, length);
325 /* Copy the individual strings into the new combined string.
326 If the combined string is wide, convert the chars to ints
327 for any individual strings that are not wide. */
330 for (t = strings; t; t = TREE_CHAIN (t))
332 int len = (TREE_STRING_LENGTH (t)
333 - ((TREE_TYPE (t) == wchar_array_type_node)
335 if ((TREE_TYPE (t) == wchar_array_type_node) == wide_flag)
337 memcpy (q, TREE_STRING_POINTER (t), len);
343 for (i = 0; i < len; i++)
345 if (WCHAR_TYPE_SIZE == HOST_BITS_PER_SHORT)
346 ((short *) q)[i] = TREE_STRING_POINTER (t)[i];
348 ((int *) q)[i] = TREE_STRING_POINTER (t)[i];
350 q += len * wchar_bytes;
356 for (i = 0; i < wchar_bytes; i++)
362 value = make_node (STRING_CST);
363 TREE_STRING_POINTER (value) = p;
364 TREE_STRING_LENGTH (value) = length;
369 length = TREE_STRING_LENGTH (value);
370 if (TREE_TYPE (value) == wchar_array_type_node)
374 /* Compute the number of elements, for the array type. */
375 nchars = wide_flag ? length / wchar_bytes : length;
377 if (pedantic && nchars > nchars_max)
378 pedwarn ("string length `%d' is greater than the minimum length `%d' ANSI C is required to support",
381 /* Create the array type for the string constant.
382 -Wwrite-strings says make the string constant an array of const char
383 so that copying it to a non-const pointer will get a warning.
384 For C++, this is the standard behavior. */
385 if (flag_const_strings
386 && (! flag_traditional && ! flag_writable_strings))
389 = build_type_variant (wide_flag ? wchar_type_node : char_type_node,
392 = build_array_type (elements,
393 build_index_type (build_int_2 (nchars - 1, 0)));
397 = build_array_type (wide_flag ? wchar_type_node : char_type_node,
398 build_index_type (build_int_2 (nchars - 1, 0)));
400 TREE_CONSTANT (value) = 1;
401 TREE_READONLY (value) = ! flag_writable_strings;
402 TREE_STATIC (value) = 1;
406 /* To speed up processing of attributes, we maintain an array of
407 IDENTIFIER_NODES and the corresponding attribute types. */
409 /* Array to hold attribute information. */
411 static struct {enum attrs id; tree name; int min, max, decl_req;} attrtab[50];
413 static int attrtab_idx = 0;
415 /* Add an entry to the attribute table above. */
418 add_attribute (id, string, min_len, max_len, decl_req)
421 int min_len, max_len;
426 attrtab[attrtab_idx].id = id;
427 attrtab[attrtab_idx].name = get_identifier (string);
428 attrtab[attrtab_idx].min = min_len;
429 attrtab[attrtab_idx].max = max_len;
430 attrtab[attrtab_idx++].decl_req = decl_req;
432 sprintf (buf, "__%s__", string);
434 attrtab[attrtab_idx].id = id;
435 attrtab[attrtab_idx].name = get_identifier (buf);
436 attrtab[attrtab_idx].min = min_len;
437 attrtab[attrtab_idx].max = max_len;
438 attrtab[attrtab_idx++].decl_req = decl_req;
441 /* Initialize attribute table. */
446 add_attribute (A_PACKED, "packed", 0, 0, 0);
447 add_attribute (A_NOCOMMON, "nocommon", 0, 0, 1);
448 add_attribute (A_COMMON, "common", 0, 0, 1);
449 add_attribute (A_NORETURN, "noreturn", 0, 0, 1);
450 add_attribute (A_NORETURN, "volatile", 0, 0, 1);
451 add_attribute (A_UNUSED, "unused", 0, 0, 0);
452 add_attribute (A_CONST, "const", 0, 0, 1);
453 add_attribute (A_T_UNION, "transparent_union", 0, 0, 0);
454 add_attribute (A_CONSTRUCTOR, "constructor", 0, 0, 1);
455 add_attribute (A_DESTRUCTOR, "destructor", 0, 0, 1);
456 add_attribute (A_MODE, "mode", 1, 1, 1);
457 add_attribute (A_SECTION, "section", 1, 1, 1);
458 add_attribute (A_ALIGNED, "aligned", 0, 1, 0);
459 add_attribute (A_FORMAT, "format", 3, 3, 1);
460 add_attribute (A_FORMAT_ARG, "format_arg", 1, 1, 1);
461 add_attribute (A_WEAK, "weak", 0, 0, 1);
462 add_attribute (A_ALIAS, "alias", 1, 1, 1);
463 add_attribute (A_NO_INSTRUMENT_FUNCTION, "no_instrument_function", 0, 0, 1);
464 add_attribute (A_NO_CHECK_MEMORY_USAGE, "no_check_memory_usage", 0, 0, 1);
465 add_attribute (A_MALLOC, "malloc", 0, 0, 1);
466 add_attribute (A_NO_LIMIT_STACK, "no_stack_limit", 0, 0, 1);
467 add_attribute (A_PURE, "pure", 0, 0, 1);
470 /* Default implementation of valid_lang_attribute, below. By default, there
471 are no language-specific attributes. */
474 default_valid_lang_attribute (attr_name, attr_args, decl, type)
475 tree attr_name ATTRIBUTE_UNUSED;
476 tree attr_args ATTRIBUTE_UNUSED;
477 tree decl ATTRIBUTE_UNUSED;
478 tree type ATTRIBUTE_UNUSED;
483 /* Return a 1 if ATTR_NAME and ATTR_ARGS denote a valid language-specific
484 attribute for either declaration DECL or type TYPE and 0 otherwise. */
486 int (*valid_lang_attribute) PARAMS ((tree, tree, tree, tree))
487 = default_valid_lang_attribute;
489 /* Process the attributes listed in ATTRIBUTES and PREFIX_ATTRIBUTES
490 and install them in NODE, which is either a DECL (including a TYPE_DECL)
491 or a TYPE. PREFIX_ATTRIBUTES can appear after the declaration specifiers
492 and declaration modifiers but before the declaration proper. */
495 decl_attributes (node, attributes, prefix_attributes)
496 tree node, attributes, prefix_attributes;
498 tree decl = 0, type = 0;
502 if (attrtab_idx == 0)
508 type = TREE_TYPE (decl);
509 is_type = TREE_CODE (node) == TYPE_DECL;
511 else if (TYPE_P (node))
512 type = node, is_type = 1;
514 #ifdef PRAGMA_INSERT_ATTRIBUTES
515 /* If the code in c-pragma.c wants to insert some attributes then
516 allow it to do so. Do this before allowing machine back ends to
517 insert attributes, so that they have the opportunity to override
518 anything done here. */
519 PRAGMA_INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
522 #ifdef INSERT_ATTRIBUTES
523 INSERT_ATTRIBUTES (node, & attributes, & prefix_attributes);
526 attributes = chainon (prefix_attributes, attributes);
528 for (a = attributes; a; a = TREE_CHAIN (a))
530 tree name = TREE_PURPOSE (a);
531 tree args = TREE_VALUE (a);
535 for (i = 0; i < attrtab_idx; i++)
536 if (attrtab[i].name == name)
539 if (i == attrtab_idx)
541 if (! valid_machine_attribute (name, args, decl, type)
542 && ! (* valid_lang_attribute) (name, args, decl, type))
543 warning ("`%s' attribute directive ignored",
544 IDENTIFIER_POINTER (name));
546 type = TREE_TYPE (decl);
549 else if (attrtab[i].decl_req && decl == 0)
551 warning ("`%s' attribute does not apply to types",
552 IDENTIFIER_POINTER (name));
555 else if (list_length (args) < attrtab[i].min
556 || list_length (args) > attrtab[i].max)
558 error ("wrong number of arguments specified for `%s' attribute",
559 IDENTIFIER_POINTER (name));
568 TYPE_PACKED (type) = 1;
569 else if (TREE_CODE (decl) == FIELD_DECL)
570 DECL_PACKED (decl) = 1;
571 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
572 used for DECL_REGISTER. It wouldn't mean anything anyway. */
574 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
578 if (TREE_CODE (decl) == VAR_DECL)
579 DECL_COMMON (decl) = 0;
581 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
585 if (TREE_CODE (decl) == VAR_DECL)
586 DECL_COMMON (decl) = 1;
588 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
592 if (TREE_CODE (decl) == FUNCTION_DECL)
593 TREE_THIS_VOLATILE (decl) = 1;
594 else if (TREE_CODE (type) == POINTER_TYPE
595 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
596 TREE_TYPE (decl) = type
598 (build_type_variant (TREE_TYPE (type),
599 TREE_READONLY (TREE_TYPE (type)), 1));
601 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
605 if (TREE_CODE (decl) == FUNCTION_DECL)
606 DECL_IS_MALLOC (decl) = 1;
607 /* ??? TODO: Support types. */
609 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
615 TREE_USED (decl) = 1;
617 TREE_USED (type) = 1;
618 else if (TREE_CODE (decl) == PARM_DECL
619 || TREE_CODE (decl) == VAR_DECL
620 || TREE_CODE (decl) == FUNCTION_DECL
621 || TREE_CODE (decl) == LABEL_DECL)
622 TREE_USED (decl) = 1;
624 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
628 if (TREE_CODE (decl) == FUNCTION_DECL)
629 TREE_READONLY (decl) = 1;
630 else if (TREE_CODE (type) == POINTER_TYPE
631 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
632 TREE_TYPE (decl) = type
634 (build_type_variant (TREE_TYPE (type), 1,
635 TREE_THIS_VOLATILE (TREE_TYPE (type))));
637 warning ( "`%s' attribute ignored", IDENTIFIER_POINTER (name));
641 if (TREE_CODE (decl) == FUNCTION_DECL)
642 DECL_IS_PURE (decl) = 1;
643 /* ??? TODO: Support types. */
645 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
651 && TREE_CODE (type) == UNION_TYPE
653 || (TYPE_FIELDS (type) != 0
654 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))))
655 TYPE_TRANSPARENT_UNION (type) = 1;
656 else if (decl != 0 && TREE_CODE (decl) == PARM_DECL
657 && TREE_CODE (type) == UNION_TYPE
658 && TYPE_MODE (type) == DECL_MODE (TYPE_FIELDS (type)))
659 DECL_TRANSPARENT_UNION (decl) = 1;
661 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
665 if (TREE_CODE (decl) == FUNCTION_DECL
666 && TREE_CODE (type) == FUNCTION_TYPE
667 && decl_function_context (decl) == 0)
669 DECL_STATIC_CONSTRUCTOR (decl) = 1;
670 TREE_USED (decl) = 1;
673 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
677 if (TREE_CODE (decl) == FUNCTION_DECL
678 && TREE_CODE (type) == FUNCTION_TYPE
679 && decl_function_context (decl) == 0)
681 DECL_STATIC_DESTRUCTOR (decl) = 1;
682 TREE_USED (decl) = 1;
685 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
689 if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE)
690 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
694 const char *p = IDENTIFIER_POINTER (TREE_VALUE (args));
695 int len = strlen (p);
696 enum machine_mode mode = VOIDmode;
699 if (len > 4 && p[0] == '_' && p[1] == '_'
700 && p[len - 1] == '_' && p[len - 2] == '_')
702 char *newp = (char *) alloca (len - 1);
704 strcpy (newp, &p[2]);
705 newp[len - 4] = '\0';
709 /* Give this decl a type with the specified mode.
710 First check for the special modes. */
711 if (! strcmp (p, "byte"))
713 else if (!strcmp (p, "word"))
715 else if (! strcmp (p, "pointer"))
718 for (j = 0; j < NUM_MACHINE_MODES; j++)
719 if (!strcmp (p, GET_MODE_NAME (j)))
720 mode = (enum machine_mode) j;
722 if (mode == VOIDmode)
723 error ("unknown machine mode `%s'", p);
724 else if (0 == (typefm = type_for_mode (mode,
725 TREE_UNSIGNED (type))))
726 error ("no data type for mode `%s'", p);
729 TREE_TYPE (decl) = type = typefm;
730 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0;
731 layout_decl (decl, 0);
737 #ifdef ASM_OUTPUT_SECTION_NAME
738 if ((TREE_CODE (decl) == FUNCTION_DECL
739 || TREE_CODE (decl) == VAR_DECL)
740 && TREE_CODE (TREE_VALUE (args)) == STRING_CST)
742 if (TREE_CODE (decl) == VAR_DECL
743 && current_function_decl != NULL_TREE
744 && ! TREE_STATIC (decl))
745 error_with_decl (decl,
746 "section attribute cannot be specified for local variables");
747 /* The decl may have already been given a section attribute from
748 a previous declaration. Ensure they match. */
749 else if (DECL_SECTION_NAME (decl) != NULL_TREE
750 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
751 TREE_STRING_POINTER (TREE_VALUE (args))) != 0)
752 error_with_decl (node,
753 "section of `%s' conflicts with previous declaration");
755 DECL_SECTION_NAME (decl) = TREE_VALUE (args);
758 error_with_decl (node,
759 "section attribute not allowed for `%s'");
761 error_with_decl (node,
762 "section attributes are not supported for this target");
769 = (args ? TREE_VALUE (args)
770 : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
773 /* Strip any NOPs of any kind. */
774 while (TREE_CODE (align_expr) == NOP_EXPR
775 || TREE_CODE (align_expr) == CONVERT_EXPR
776 || TREE_CODE (align_expr) == NON_LVALUE_EXPR)
777 align_expr = TREE_OPERAND (align_expr, 0);
779 if (TREE_CODE (align_expr) != INTEGER_CST)
781 error ("requested alignment is not a constant");
785 if ((i = tree_log2 (align_expr)) == -1)
786 error ("requested alignment is not a power of 2");
787 else if (i > HOST_BITS_PER_INT - 2)
788 error ("requested alignment is too large");
793 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
794 DECL_USER_ALIGN (decl) = 1;
798 TYPE_ALIGN (type) = (1 << i) * BITS_PER_UNIT;
799 TYPE_USER_ALIGN (type) = 1;
802 else if (TREE_CODE (decl) != VAR_DECL
803 && TREE_CODE (decl) != FIELD_DECL)
804 error_with_decl (decl,
805 "alignment may not be specified for `%s'");
808 DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT;
809 DECL_USER_ALIGN (decl) = 1;
816 tree format_type_id = TREE_VALUE (args);
817 tree format_num_expr = TREE_VALUE (TREE_CHAIN (args));
818 tree first_arg_num_expr
819 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (args)));
820 unsigned HOST_WIDE_INT format_num, first_arg_num;
821 enum format_type format_type;
823 unsigned int arg_num;
825 if (TREE_CODE (decl) != FUNCTION_DECL)
827 error_with_decl (decl,
828 "argument format specified for non-function `%s'");
832 if (TREE_CODE (format_type_id) != IDENTIFIER_NODE)
834 error ("unrecognized format specifier");
839 const char *p = IDENTIFIER_POINTER (format_type_id);
841 if (!strcmp (p, "printf") || !strcmp (p, "__printf__"))
842 format_type = printf_format_type;
843 else if (!strcmp (p, "scanf") || !strcmp (p, "__scanf__"))
844 format_type = scanf_format_type;
845 else if (!strcmp (p, "strftime")
846 || !strcmp (p, "__strftime__"))
847 format_type = strftime_format_type;
850 warning ("`%s' is an unrecognized format function type", p);
855 /* Strip any conversions from the string index and first arg number
856 and verify they are constants. */
857 while (TREE_CODE (format_num_expr) == NOP_EXPR
858 || TREE_CODE (format_num_expr) == CONVERT_EXPR
859 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
860 format_num_expr = TREE_OPERAND (format_num_expr, 0);
862 while (TREE_CODE (first_arg_num_expr) == NOP_EXPR
863 || TREE_CODE (first_arg_num_expr) == CONVERT_EXPR
864 || TREE_CODE (first_arg_num_expr) == NON_LVALUE_EXPR)
865 first_arg_num_expr = TREE_OPERAND (first_arg_num_expr, 0);
867 if (TREE_CODE (format_num_expr) != INTEGER_CST
868 || TREE_INT_CST_HIGH (format_num_expr) != 0
869 || TREE_CODE (first_arg_num_expr) != INTEGER_CST
870 || TREE_INT_CST_HIGH (first_arg_num_expr) != 0)
872 error ("format string has invalid operand number");
876 format_num = TREE_INT_CST_LOW (format_num_expr);
877 first_arg_num = TREE_INT_CST_LOW (first_arg_num_expr);
878 if (first_arg_num != 0 && first_arg_num <= format_num)
880 error ("format string arg follows the args to be formatted");
884 /* If a parameter list is specified, verify that the format_num
885 argument is actually a string, in case the format attribute
887 argument = TYPE_ARG_TYPES (type);
890 for (arg_num = 1; argument != 0 && arg_num != format_num;
891 ++arg_num, argument = TREE_CHAIN (argument))
895 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
896 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
899 error ("format string arg not a string type");
903 else if (first_arg_num != 0)
905 /* Verify that first_arg_num points to the last arg,
908 arg_num++, argument = TREE_CHAIN (argument);
910 if (arg_num != first_arg_num)
912 error ("args to be formatted is not '...'");
918 record_function_format (DECL_NAME (decl),
919 DECL_ASSEMBLER_NAME (decl),
920 format_type, format_num, first_arg_num);
926 tree format_num_expr = TREE_VALUE (args);
927 unsigned HOST_WIDE_INT format_num;
928 unsigned int arg_num;
931 if (TREE_CODE (decl) != FUNCTION_DECL)
933 error_with_decl (decl,
934 "argument format specified for non-function `%s'");
938 /* Strip any conversions from the first arg number and verify it
940 while (TREE_CODE (format_num_expr) == NOP_EXPR
941 || TREE_CODE (format_num_expr) == CONVERT_EXPR
942 || TREE_CODE (format_num_expr) == NON_LVALUE_EXPR)
943 format_num_expr = TREE_OPERAND (format_num_expr, 0);
945 if (TREE_CODE (format_num_expr) != INTEGER_CST
946 || TREE_INT_CST_HIGH (format_num_expr) != 0)
948 error ("format string has invalid operand number");
952 format_num = TREE_INT_CST_LOW (format_num_expr);
954 /* If a parameter list is specified, verify that the format_num
955 argument is actually a string, in case the format attribute
957 argument = TYPE_ARG_TYPES (type);
960 for (arg_num = 1; argument != 0 && arg_num != format_num;
961 ++arg_num, argument = TREE_CHAIN (argument))
965 || TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE
966 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (argument)))
969 error ("format string arg not a string type");
974 if (TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) != POINTER_TYPE
975 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (TREE_TYPE (decl))))
978 error ("function does not return string type");
982 record_international_format (DECL_NAME (decl),
983 DECL_ASSEMBLER_NAME (decl),
993 if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
994 || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl)))
995 error_with_decl (decl,
996 "`%s' defined both normally and as an alias");
997 else if (decl_function_context (decl) == 0)
1001 id = TREE_VALUE (args);
1002 if (TREE_CODE (id) != STRING_CST)
1004 error ("alias arg not a string");
1007 id = get_identifier (TREE_STRING_POINTER (id));
1008 /* This counts as a use of the object pointed to. */
1011 if (TREE_CODE (decl) == FUNCTION_DECL)
1012 DECL_INITIAL (decl) = error_mark_node;
1014 DECL_EXTERNAL (decl) = 0;
1015 assemble_alias (decl, id);
1018 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
1021 case A_NO_CHECK_MEMORY_USAGE:
1022 if (TREE_CODE (decl) != FUNCTION_DECL)
1024 error_with_decl (decl,
1025 "`%s' attribute applies only to functions",
1026 IDENTIFIER_POINTER (name));
1028 else if (DECL_INITIAL (decl))
1030 error_with_decl (decl,
1031 "can't set `%s' attribute after definition",
1032 IDENTIFIER_POINTER (name));
1035 DECL_NO_CHECK_MEMORY_USAGE (decl) = 1;
1038 case A_NO_INSTRUMENT_FUNCTION:
1039 if (TREE_CODE (decl) != FUNCTION_DECL)
1041 error_with_decl (decl,
1042 "`%s' attribute applies only to functions",
1043 IDENTIFIER_POINTER (name));
1045 else if (DECL_INITIAL (decl))
1047 error_with_decl (decl,
1048 "can't set `%s' attribute after definition",
1049 IDENTIFIER_POINTER (name));
1052 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1;
1055 case A_NO_LIMIT_STACK:
1056 if (TREE_CODE (decl) != FUNCTION_DECL)
1058 error_with_decl (decl,
1059 "`%s' attribute applies only to functions",
1060 IDENTIFIER_POINTER (name));
1062 else if (DECL_INITIAL (decl))
1064 error_with_decl (decl,
1065 "can't set `%s' attribute after definition",
1066 IDENTIFIER_POINTER (name));
1069 DECL_NO_LIMIT_STACK (decl) = 1;
1075 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
1076 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
1078 The head of the declspec list is stored in DECLSPECS.
1079 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
1081 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
1082 the list elements. We drop the containing TREE_LIST nodes and link the
1083 resulting attributes together the way decl_attributes expects them. */
1086 split_specs_attrs (specs_attrs, declspecs, prefix_attributes)
1088 tree *declspecs, *prefix_attributes;
1090 tree t, s, a, next, specs, attrs;
1092 /* This can happen after an __extension__ in pedantic mode. */
1093 if (specs_attrs != NULL_TREE
1094 && TREE_CODE (specs_attrs) == INTEGER_CST)
1096 *declspecs = NULL_TREE;
1097 *prefix_attributes = NULL_TREE;
1101 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
1102 if (specs_attrs != NULL_TREE
1103 && TREE_CODE (specs_attrs) != TREE_LIST)
1105 *declspecs = specs_attrs;
1106 *prefix_attributes = NULL_TREE;
1110 /* Remember to keep the lists in the same order, element-wise. */
1112 specs = s = NULL_TREE;
1113 attrs = a = NULL_TREE;
1114 for (t = specs_attrs; t; t = next)
1116 next = TREE_CHAIN (t);
1117 /* Declspecs have a non-NULL TREE_VALUE. */
1118 if (TREE_VALUE (t) != NULL_TREE)
1120 if (specs == NULL_TREE)
1130 if (attrs == NULL_TREE)
1131 attrs = a = TREE_PURPOSE (t);
1134 TREE_CHAIN (a) = TREE_PURPOSE (t);
1135 a = TREE_PURPOSE (t);
1137 /* More attrs can be linked here, move A to the end. */
1138 while (TREE_CHAIN (a) != NULL_TREE)
1143 /* Terminate the lists. */
1145 TREE_CHAIN (s) = NULL_TREE;
1147 TREE_CHAIN (a) = NULL_TREE;
1151 *prefix_attributes = attrs;
1154 /* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes.
1155 This function is used by the parser when a rule will accept attributes
1156 in a particular position, but we don't want to support that just yet.
1158 A warning is issued for every ignored attribute. */
1161 strip_attrs (specs_attrs)
1166 split_specs_attrs (specs_attrs, &specs, &attrs);
1170 warning ("`%s' attribute ignored",
1171 IDENTIFIER_POINTER (TREE_PURPOSE (attrs)));
1172 attrs = TREE_CHAIN (attrs);
1178 /* Check a printf/fprintf/sprintf/scanf/fscanf/sscanf format against
1179 a parameter list. */
1181 #define T_I &integer_type_node
1182 #define T_L &long_integer_type_node
1183 #define T_LL &long_long_integer_type_node
1184 #define T_S &short_integer_type_node
1185 #define T_UI &unsigned_type_node
1186 #define T_UL &long_unsigned_type_node
1187 #define T_ULL &long_long_unsigned_type_node
1188 #define T_US &short_unsigned_type_node
1189 #define T_F &float_type_node
1190 #define T_D &double_type_node
1191 #define T_LD &long_double_type_node
1192 #define T_C &char_type_node
1193 #define T_SC &signed_char_type_node
1194 #define T_UC &unsigned_char_type_node
1195 #define T_V &void_type_node
1196 #define T_W &wchar_type_node
1197 #define T_WI &wint_type_node
1198 #define T_ST &sizetype
1199 #define T_SST &signed_size_type_node
1200 #define T_PD &ptrdiff_type_node
1201 #define T_UPD &unsigned_ptrdiff_type_node
1202 #define T_IM NULL /* intmax_t not yet implemented. */
1203 #define T_UIM NULL /* uintmax_t not yet implemented. */
1206 const char *format_chars;
1208 /* Type of argument if no length modifier is used. */
1210 /* Type of argument if length modifier for shortening to byte is used.
1211 If NULL, then this modifier is not allowed. */
1213 /* Type of argument if length modifier for shortening is used.
1214 If NULL, then this modifier is not allowed. */
1216 /* Type of argument if length modifier `l' is used.
1217 If NULL, then this modifier is not allowed. */
1219 /* Type of argument if length modifier `q' or `ll' is used.
1220 If NULL, then this modifier is not allowed. */
1222 /* Type of argument if length modifier `L' is used.
1223 If NULL, then this modifier is not allowed. */
1225 /* Type of argument if length modifiers 'z' or `Z' is used.
1226 If NULL, then this modifier is not allowed. */
1228 /* Type of argument if length modifier 't' is used.
1229 If NULL, then this modifier is not allowed. */
1231 /* Type of argument if length modifier 'j' is used.
1232 If NULL, then this modifier is not allowed. */
1234 /* List of other modifier characters allowed with these options. */
1235 const char *flag_chars;
1238 static format_char_info print_char_table[] = {
1239 { "di", 0, T_I, T_I, T_I, T_L, T_LL, T_LL, T_SST, T_PD, T_IM, "-wp0 +'" },
1240 { "oxX", 0, T_UI, T_UI, T_UI, T_UL, T_ULL, T_ULL, T_ST, T_UPD, T_UIM, "-wp0#" },
1241 { "u", 0, T_UI, T_UI, T_UI, T_UL, T_ULL, T_ULL, T_ST, T_UPD, T_UIM, "-wp0'" },
1242 /* A GNU extension. */
1243 { "m", 0, T_V, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-wp" },
1244 { "fFgG", 0, T_D, NULL, NULL, T_D, NULL, T_LD, NULL, NULL, NULL, "-wp0 +#'" },
1245 { "eEaA", 0, T_D, NULL, NULL, T_D, NULL, T_LD, NULL, NULL, NULL, "-wp0 +#" },
1246 { "c", 0, T_I, NULL, NULL, T_WI, NULL, NULL, NULL, NULL, NULL, "-w" },
1247 { "C", 0, T_WI, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-w" },
1248 { "s", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, NULL, NULL, "-wpc" },
1249 { "S", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-wp" },
1250 { "p", 1, T_V, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-wc" },
1251 { "n", 1, T_I, T_SC, T_S, T_L, T_LL, NULL, T_SST, T_PD, T_IM, "" },
1252 { NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
1255 static format_char_info scan_char_table[] = {
1256 { "di", 1, T_I, T_SC, T_S, T_L, T_LL, T_LL, T_SST, T_PD, T_IM, "*" },
1257 { "ouxX", 1, T_UI, T_UC, T_US, T_UL, T_ULL, T_ULL, T_ST, T_UPD, T_UIM, "*" },
1258 { "efFgEGaA", 1, T_F, NULL, NULL, T_D, NULL, T_LD, NULL, NULL, NULL, "*" },
1259 { "c", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, NULL, NULL, "*c" },
1260 { "s", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, NULL, NULL, "*ac" },
1261 { "[", 1, T_C, NULL, NULL, T_W, NULL, NULL, NULL, NULL, NULL, "*ac" },
1262 { "C", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "*" },
1263 { "S", 1, T_W, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "*a" },
1264 { "p", 2, T_V, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "*" },
1265 { "n", 1, T_I, T_SC, T_S, T_L, T_LL, NULL, T_SST, T_PD, T_IM, "" },
1266 { NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
1269 /* Handle format characters recognized by glibc's strftime.c.
1270 '2' - MUST do years as only two digits
1271 '3' - MAY do years as only two digits (depending on locale)
1272 'E' - E modifier is acceptable
1273 'O' - O modifier is acceptable to Standard C
1274 'o' - O modifier is acceptable as a GNU extension
1275 '9' - added to the C standard in C99
1276 'G' - other GNU extensions */
1278 static format_char_info time_char_table[] = {
1279 { "y", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "2EO-_0w" },
1280 { "D", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "29" },
1281 { "g", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "2Oo-_0w9" },
1282 { "cx", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "3E" },
1283 { "%", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "" },
1284 { "X", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "E" },
1285 { "RTnrt", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "9" },
1286 { "P", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "G" },
1287 { "HIMSUWdmw", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Ow" },
1288 { "e", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Ow9" },
1289 { "j", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Oow" },
1290 { "Vu", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Ow9" },
1291 { "Gz", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0Oow9" },
1292 { "kls", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0OGw" },
1293 { "ABZa", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "^#" },
1294 { "p", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "#" },
1295 { "b", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "^" },
1296 { "h", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "^9" },
1297 { "Y", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0EOow" },
1298 { "F", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "w9" },
1299 { "C", 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "-_0EOow9" },
1300 { NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
1303 typedef struct function_format_info
1305 struct function_format_info *next; /* next structure on the list */
1306 tree name; /* identifier such as "printf" */
1307 tree assembler_name; /* optional mangled identifier (for C++) */
1308 enum format_type format_type; /* type of format (printf, scanf, etc.) */
1309 int format_num; /* number of format argument */
1310 int first_arg_num; /* number of first arg (zero for varargs) */
1311 } function_format_info;
1313 static function_format_info *function_format_list = NULL;
1315 typedef struct international_format_info
1317 struct international_format_info *next; /* next structure on the list */
1318 tree name; /* identifier such as "gettext" */
1319 tree assembler_name; /* optional mangled identifier (for C++) */
1320 int format_num; /* number of format argument */
1321 } international_format_info;
1323 static international_format_info *international_format_list = NULL;
1325 static void check_format_info PARAMS ((function_format_info *, tree));
1327 /* Initialize the table of functions to perform format checking on.
1328 The ANSI functions are always checked (whether <stdio.h> is
1329 included or not), since it is common to call printf without
1330 including <stdio.h>. There shouldn't be a problem with this,
1331 since ANSI reserves these function names whether you include the
1332 header file or not. In any case, the checking is harmless.
1334 Also initialize the name of function that modify the format string for
1335 internationalization purposes. */
1338 init_function_format_info ()
1340 record_function_format (get_identifier ("printf"), NULL_TREE,
1341 printf_format_type, 1, 2);
1342 record_function_format (get_identifier ("fprintf"), NULL_TREE,
1343 printf_format_type, 2, 3);
1344 record_function_format (get_identifier ("sprintf"), NULL_TREE,
1345 printf_format_type, 2, 3);
1346 record_function_format (get_identifier ("scanf"), NULL_TREE,
1347 scanf_format_type, 1, 2);
1348 record_function_format (get_identifier ("fscanf"), NULL_TREE,
1349 scanf_format_type, 2, 3);
1350 record_function_format (get_identifier ("sscanf"), NULL_TREE,
1351 scanf_format_type, 2, 3);
1352 record_function_format (get_identifier ("vprintf"), NULL_TREE,
1353 printf_format_type, 1, 0);
1354 record_function_format (get_identifier ("vfprintf"), NULL_TREE,
1355 printf_format_type, 2, 0);
1356 record_function_format (get_identifier ("vsprintf"), NULL_TREE,
1357 printf_format_type, 2, 0);
1358 record_function_format (get_identifier ("strftime"), NULL_TREE,
1359 strftime_format_type, 3, 0);
1363 /* ISO C99 adds the snprintf and vscanf family functions. */
1364 record_function_format (get_identifier ("snprintf"), NULL_TREE,
1365 printf_format_type, 3, 4);
1366 record_function_format (get_identifier ("vsnprintf"), NULL_TREE,
1367 printf_format_type, 3, 0);
1368 record_function_format (get_identifier ("vscanf"), NULL_TREE,
1369 scanf_format_type, 1, 0);
1370 record_function_format (get_identifier ("vfscanf"), NULL_TREE,
1371 scanf_format_type, 2, 0);
1372 record_function_format (get_identifier ("vsscanf"), NULL_TREE,
1373 scanf_format_type, 2, 0);
1376 record_international_format (get_identifier ("gettext"), NULL_TREE, 1);
1377 record_international_format (get_identifier ("dgettext"), NULL_TREE, 2);
1378 record_international_format (get_identifier ("dcgettext"), NULL_TREE, 2);
1381 /* Record information for argument format checking. FUNCTION_IDENT is
1382 the identifier node for the name of the function to check (its decl
1383 need not exist yet).
1384 FORMAT_TYPE specifies the type of format checking. FORMAT_NUM is the number
1385 of the argument which is the format control string (starting from 1).
1386 FIRST_ARG_NUM is the number of the first actual argument to check
1387 against the format string, or zero if no checking is not be done
1388 (e.g. for varargs such as vfprintf). */
1391 record_function_format (name, assembler_name, format_type,
1392 format_num, first_arg_num)
1394 tree assembler_name;
1395 enum format_type format_type;
1399 function_format_info *info;
1401 /* Re-use existing structure if it's there. */
1403 for (info = function_format_list; info; info = info->next)
1405 if (info->name == name && info->assembler_name == assembler_name)
1410 info = (function_format_info *) xmalloc (sizeof (function_format_info));
1411 info->next = function_format_list;
1412 function_format_list = info;
1415 info->assembler_name = assembler_name;
1418 info->format_type = format_type;
1419 info->format_num = format_num;
1420 info->first_arg_num = first_arg_num;
1423 /* Record information for the names of function that modify the format
1424 argument to format functions. FUNCTION_IDENT is the identifier node for
1425 the name of the function (its decl need not exist yet) and FORMAT_NUM is
1426 the number of the argument which is the format control string (starting
1430 record_international_format (name, assembler_name, format_num)
1432 tree assembler_name;
1435 international_format_info *info;
1437 /* Re-use existing structure if it's there. */
1439 for (info = international_format_list; info; info = info->next)
1441 if (info->name == name && info->assembler_name == assembler_name)
1448 = (international_format_info *)
1449 xmalloc (sizeof (international_format_info));
1450 info->next = international_format_list;
1451 international_format_list = info;
1454 info->assembler_name = assembler_name;
1457 info->format_num = format_num;
1463 warning ("too few arguments for format");
1466 /* Check the argument list of a call to printf, scanf, etc.
1467 NAME is the function identifier.
1468 ASSEMBLER_NAME is the function's assembler identifier.
1469 (Either NAME or ASSEMBLER_NAME, but not both, may be NULL_TREE.)
1470 PARAMS is the list of argument values. */
1473 check_function_format (name, assembler_name, params)
1475 tree assembler_name;
1478 function_format_info *info;
1480 /* See if this function is a format function. */
1481 for (info = function_format_list; info; info = info->next)
1483 if (info->assembler_name
1484 ? (info->assembler_name == assembler_name)
1485 : (info->name == name))
1487 /* Yup; check it. */
1488 check_format_info (info, params);
1494 /* Check the argument list of a call to printf, scanf, etc.
1495 INFO points to the function_format_info structure.
1496 PARAMS is the list of argument values. */
1499 check_format_info (info, params)
1500 function_format_info *info;
1505 int suppressed, wide, precise;
1506 int length_char = 0;
1513 tree first_fillin_param;
1514 const char *format_chars;
1515 format_char_info *fci = NULL;
1517 int has_operand_number = 0;
1519 /* Skip to format argument. If the argument isn't available, there's
1520 no work for us to do; prototype checking will catch the problem. */
1521 for (arg_num = 1; ; ++arg_num)
1525 if (arg_num == info->format_num)
1527 params = TREE_CHAIN (params);
1529 format_tree = TREE_VALUE (params);
1530 params = TREE_CHAIN (params);
1531 if (format_tree == 0)
1534 /* We can only check the format if it's a string constant. */
1535 while (TREE_CODE (format_tree) == NOP_EXPR)
1536 format_tree = TREE_OPERAND (format_tree, 0); /* strip coercion */
1538 if (TREE_CODE (format_tree) == CALL_EXPR
1539 && TREE_CODE (TREE_OPERAND (format_tree, 0)) == ADDR_EXPR
1540 && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0))
1543 tree function = TREE_OPERAND (TREE_OPERAND (format_tree, 0), 0);
1545 /* See if this is a call to a known internationalization function
1546 that modifies the format arg. */
1547 international_format_info *info;
1549 for (info = international_format_list; info; info = info->next)
1550 if (info->assembler_name
1551 ? (info->assembler_name == DECL_ASSEMBLER_NAME (function))
1552 : (info->name == DECL_NAME (function)))
1557 for (inner_args = TREE_OPERAND (format_tree, 1), i = 1;
1559 inner_args = TREE_CHAIN (inner_args), i++)
1560 if (i == info->format_num)
1562 format_tree = TREE_VALUE (inner_args);
1564 while (TREE_CODE (format_tree) == NOP_EXPR)
1565 format_tree = TREE_OPERAND (format_tree, 0);
1570 if (integer_zerop (format_tree))
1572 warning ("null format string");
1575 if (TREE_CODE (format_tree) != ADDR_EXPR)
1577 /* The user may get multiple warnings if the supplied argument
1578 isn't even a string pointer. */
1579 /* Functions taking a va_list normally pass a non-literal format
1580 string. These functions typically are declared with
1581 first_arg_num == 0, so avoid warning in those cases. */
1582 if (info->first_arg_num != 0 && warn_format > 1)
1583 warning ("format not a string literal, argument types not checked");
1586 format_tree = TREE_OPERAND (format_tree, 0);
1587 if (TREE_CODE (format_tree) != STRING_CST)
1589 /* The user may get multiple warnings if the supplied argument
1590 isn't even a string pointer. */
1591 /* Functions taking a va_list normally pass a non-literal format
1592 string. These functions typically are declared with
1593 first_arg_num == 0, so avoid warning in those cases. */
1594 if (info->first_arg_num != 0 && warn_format > 1)
1595 warning ("format not a string literal, argument types not checked");
1598 format_chars = TREE_STRING_POINTER (format_tree);
1599 format_length = TREE_STRING_LENGTH (format_tree);
1600 if (format_length <= 1)
1601 warning ("zero-length format string");
1602 if (format_chars[--format_length] != 0)
1604 warning ("unterminated format string");
1607 /* Skip to first argument to check. */
1608 while (arg_num + 1 < info->first_arg_num)
1612 params = TREE_CHAIN (params);
1616 first_fillin_param = params;
1620 int char_type_flag = 0;
1621 if (*format_chars == 0)
1623 if (format_chars - TREE_STRING_POINTER (format_tree) != format_length)
1624 warning ("embedded `\\0' in format");
1625 if (info->first_arg_num != 0 && params != 0 && ! has_operand_number)
1626 warning ("too many arguments for format");
1629 if (*format_chars++ != '%')
1631 if (*format_chars == 0)
1633 warning ("spurious trailing `%%' in format");
1636 if (*format_chars == '%')
1642 suppressed = wide = precise = FALSE;
1643 if (info->format_type == scanf_format_type)
1645 suppressed = *format_chars == '*';
1648 while (ISDIGIT (*format_chars))
1651 else if (info->format_type == strftime_format_type)
1653 while (*format_chars != 0 && index ("_-0^#", *format_chars) != 0)
1656 warning ("ANSI C does not support the strftime `%c' flag",
1658 if (index (flag_chars, *format_chars) != 0)
1660 warning ("repeated `%c' flag in format",
1666 i = strlen (flag_chars);
1667 flag_chars[i++] = *format_chars++;
1671 while (ISDIGIT ((unsigned char) *format_chars))
1676 if (wide && pedantic)
1677 warning ("ANSI C does not support strftime format width");
1678 if (*format_chars == 'E' || *format_chars == 'O')
1680 i = strlen (flag_chars);
1681 flag_chars[i++] = *format_chars++;
1683 if (*format_chars == 'E' || *format_chars == 'O')
1685 warning ("multiple E/O modifiers in format");
1686 while (*format_chars == 'E' || *format_chars == 'O')
1691 else if (info->format_type == printf_format_type)
1693 /* See if we have a number followed by a dollar sign. If we do,
1694 it is an operand number, so set PARAMS to that operand. */
1695 if (*format_chars >= '0' && *format_chars <= '9')
1697 const char *p = format_chars;
1699 while (*p >= '0' && *p++ <= '9')
1704 int opnum = atoi (format_chars);
1707 warning ("ANSI C does not support printf %%n$");
1709 params = first_fillin_param;
1710 format_chars = p + 1;
1711 has_operand_number = 1;
1713 for (i = 1; i < opnum && params != 0; i++)
1714 params = TREE_CHAIN (params);
1716 if (opnum == 0 || params == 0)
1718 warning ("operand number out of range in format");
1724 while (*format_chars != 0 && index (" +#0-'", *format_chars) != 0)
1726 if (index (flag_chars, *format_chars) != 0)
1727 warning ("repeated `%c' flag in format", *format_chars++);
1730 i = strlen (flag_chars);
1731 flag_chars[i++] = *format_chars++;
1735 /* "If the space and + flags both appear,
1736 the space flag will be ignored." */
1737 if (index (flag_chars, ' ') != 0
1738 && index (flag_chars, '+') != 0)
1739 warning ("use of both ` ' and `+' flags in format");
1740 /* "If the 0 and - flags both appear,
1741 the 0 flag will be ignored." */
1742 if (index (flag_chars, '0') != 0
1743 && index (flag_chars, '-') != 0)
1744 warning ("use of both `0' and `-' flags in format");
1745 if (index (flag_chars, '\'') && pedantic)
1746 warning ("ANSI C does not support the `'' format flag");
1747 if (*format_chars == '*')
1750 /* "...a field width...may be indicated by an asterisk.
1751 In this case, an int argument supplies the field width..." */
1758 if (info->first_arg_num != 0)
1760 cur_param = TREE_VALUE (params);
1761 params = TREE_CHAIN (params);
1763 /* size_t is generally not valid here.
1764 It will work on most machines, because size_t and int
1765 have the same mode. But might as well warn anyway,
1766 since it will fail on other machines. */
1767 if ((TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
1768 != integer_type_node)
1770 (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
1771 != unsigned_type_node))
1772 warning ("field width is not type int (arg %d)", arg_num);
1777 while (ISDIGIT (*format_chars))
1783 if (*format_chars == '.')
1787 /* "...a...precision...may be indicated by an asterisk.
1788 In this case, an int argument supplies the...precision." */
1789 if (*format_chars == '*')
1791 if (info->first_arg_num != 0)
1799 cur_param = TREE_VALUE (params);
1800 params = TREE_CHAIN (params);
1802 if ((TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
1803 != integer_type_node)
1805 (TYPE_MAIN_VARIANT (TREE_TYPE (cur_param))
1806 != unsigned_type_node))
1807 warning ("field precision is not type int (arg %d)",
1813 while (ISDIGIT (*format_chars))
1821 if (info->format_type != strftime_format_type)
1823 if (*format_chars == 'h' || *format_chars == 'l')
1824 length_char = *format_chars++;
1825 else if (*format_chars == 'q' || *format_chars == 'L')
1827 length_char = *format_chars++;
1828 if (length_char == 'q' && pedantic)
1829 warning ("ANSI C does not support the `%c' length modifier",
1832 else if (*format_chars == 'Z' || *format_chars == 'z')
1834 length_char = *format_chars++;
1835 if (pedantic && (length_char == 'Z' || !flag_isoc99))
1836 warning ("ANSI C does not support the `%c' length modifier",
1839 else if (*format_chars == 't' || *format_chars == 'j')
1841 length_char = *format_chars++;
1842 if (pedantic && !flag_isoc99)
1843 warning ("ANSI C does not support the `%c' length modifier",
1848 if (length_char == 'l' && *format_chars == 'l')
1850 length_char = 'q', format_chars++;
1851 if (pedantic && !flag_isoc99)
1852 warning ("ANSI C does not support the `ll' length modifier");
1854 else if (length_char == 'h' && *format_chars == 'h')
1856 length_char = 'H', format_chars++;
1857 if (pedantic && !flag_isoc99)
1858 warning ("ANSI C does not support the `hh' length modifier");
1860 if (*format_chars == 'a' && info->format_type == scanf_format_type)
1862 if (format_chars[1] == 's' || format_chars[1] == 'S'
1863 || format_chars[1] == '[')
1865 /* `a' is used as a flag. */
1870 if (suppressed && length_char != 0)
1871 warning ("use of `*' and `%c' together in format", length_char);
1873 format_char = *format_chars;
1874 if (format_char == 0
1875 || (info->format_type != strftime_format_type && format_char == '%'))
1877 warning ("conversion lacks type at end of format");
1880 /* The m, C, and S formats are GNU extensions. */
1881 if (pedantic && info->format_type != strftime_format_type
1882 && (format_char == 'm' || format_char == 'C' || format_char == 'S'))
1883 warning ("ANSI C does not support the `%c' format", format_char);
1884 /* The a, A and F formats are C99 extensions. */
1885 if (pedantic && info->format_type != strftime_format_type
1886 && (format_char == 'a' || format_char == 'A' || format_char == 'F')
1888 warning ("ANSI C does not support the `%c' format", format_char);
1890 switch (info->format_type)
1892 case printf_format_type:
1893 fci = print_char_table;
1895 case scanf_format_type:
1896 fci = scan_char_table;
1898 case strftime_format_type:
1899 fci = time_char_table;
1904 while (fci->format_chars != 0
1905 && index (fci->format_chars, format_char) == 0)
1907 if (fci->format_chars == 0)
1909 if (ISGRAPH(format_char))
1910 warning ("unknown conversion type character `%c' in format",
1913 warning ("unknown conversion type character 0x%x in format",
1919 if (index (fci->flag_chars, 'G') != 0)
1920 warning ("ANSI C does not support `%%%c'", format_char);
1921 if (index (fci->flag_chars, '9') != 0 && !flag_isoc99)
1922 warning ("ANSI C does not support `%%%c'", format_char);
1923 if ((index (fci->flag_chars, 'o') != 0
1924 || (!flag_isoc99 && index (fci->flag_chars, 'O') != 0))
1925 && index (flag_chars, 'O') != 0)
1926 warning ("ANSI C does not support `%%O%c'", format_char);
1927 if (!flag_isoc99 && index (flag_chars, 'E'))
1928 warning ("ANSI C does not support `%%E%c'", format_char);
1930 if (wide && index (fci->flag_chars, 'w') == 0)
1931 warning ("width used with `%c' format", format_char);
1932 if (index (fci->flag_chars, '2') != 0)
1933 warning ("`%%%c' yields only last 2 digits of year", format_char);
1934 else if (index (fci->flag_chars, '3') != 0)
1935 warning ("`%%%c' yields only last 2 digits of year in some locales",
1937 if (precise && index (fci->flag_chars, 'p') == 0)
1938 warning ("precision used with `%c' format", format_char);
1939 if (aflag && index (fci->flag_chars, 'a') == 0)
1941 warning ("`a' flag used with `%c' format", format_char);
1942 /* To simplify the following code. */
1945 /* The a flag is a GNU extension. */
1946 else if (pedantic && aflag)
1947 warning ("ANSI C does not support the `a' flag");
1948 if (info->format_type == scanf_format_type && format_char == '[')
1950 /* Skip over scan set, in case it happens to have '%' in it. */
1951 if (*format_chars == '^')
1953 /* Find closing bracket; if one is hit immediately, then
1954 it's part of the scan set rather than a terminator. */
1955 if (*format_chars == ']')
1957 while (*format_chars && *format_chars != ']')
1959 if (*format_chars != ']')
1960 /* The end of the format string was reached. */
1961 warning ("no closing `]' for `%%[' format");
1965 if (index (fci->flag_chars, '*') == 0)
1966 warning ("suppression of `%c' conversion in format", format_char);
1969 for (i = 0; flag_chars[i] != 0; ++i)
1971 if (index (fci->flag_chars, flag_chars[i]) == 0)
1972 warning ("flag `%c' used with type `%c'",
1973 flag_chars[i], format_char);
1975 if (info->format_type == strftime_format_type)
1977 if (precise && index (flag_chars, '0') != 0
1978 && (format_char == 'd' || format_char == 'i'
1979 || format_char == 'o' || format_char == 'u'
1980 || format_char == 'x' || format_char == 'X'))
1981 warning ("`0' flag ignored with precision specifier and `%c' format",
1983 switch (length_char)
1985 default: wanted_type = fci->nolen ? *(fci->nolen) : 0; break;
1986 case 'H': wanted_type = fci->hhlen ? *(fci->hhlen) : 0; break;
1987 case 'h': wanted_type = fci->hlen ? *(fci->hlen) : 0; break;
1988 case 'l': wanted_type = fci->llen ? *(fci->llen) : 0; break;
1989 case 'q': wanted_type = fci->qlen ? *(fci->qlen) : 0; break;
1990 case 'L': wanted_type = fci->bigllen ? *(fci->bigllen) : 0; break;
1991 case 'z': case 'Z': wanted_type = (fci->zlen
1992 ? (TYPE_DOMAIN (*fci->zlen)
1993 ? TYPE_DOMAIN (*fci->zlen)
1996 case 't': wanted_type = fci->tlen ? *(fci->tlen) : 0; break;
1997 case 'j': wanted_type = fci->jlen ? *(fci->jlen) : 0; break;
1999 if (wanted_type == 0)
2000 warning ("use of `%c' length character with `%c' type character",
2001 length_char, format_char);
2002 else if (length_char == 'L' && pedantic
2003 && !(format_char == 'a' || format_char == 'A'
2004 || format_char == 'e' || format_char == 'E'
2005 || format_char == 'f' || format_char == 'F'
2006 || format_char == 'g' || format_char == 'G'))
2007 warning ("ANSI C does not support the `L' length modifier with the `%c' type character",
2009 else if (length_char == 'l'
2010 && (format_char == 'c' || format_char == 's'
2011 || format_char == '[')
2012 && pedantic && !flag_isoc94)
2013 warning ("ANSI C89 does not support the `l' length modifier with the `%c' type character",
2015 else if (info->format_type == printf_format_type && pedantic
2016 && !flag_isoc99 && length_char == 'l'
2017 && (format_char == 'f' || format_char == 'e'
2018 || format_char == 'E' || format_char == 'g'
2019 || format_char == 'G'))
2020 warning ("ANSI C does not support the `l' length modifier with the `%c' type character",
2023 /* Finally. . .check type of argument against desired type! */
2024 if (info->first_arg_num == 0)
2026 if (fci->pointer_count == 0 && wanted_type == void_type_node)
2027 /* This specifier takes no argument. */
2034 cur_param = TREE_VALUE (params);
2035 params = TREE_CHAIN (params);
2037 cur_type = TREE_TYPE (cur_param);
2039 STRIP_NOPS (cur_param);
2041 /* Check the types of any additional pointer arguments
2042 that precede the "real" argument. */
2043 for (i = 0; i < fci->pointer_count + aflag; ++i)
2045 if (TREE_CODE (cur_type) == POINTER_TYPE)
2047 cur_type = TREE_TYPE (cur_type);
2049 if (cur_param != 0 && TREE_CODE (cur_param) == ADDR_EXPR)
2050 cur_param = TREE_OPERAND (cur_param, 0);
2056 if (TREE_CODE (cur_type) != ERROR_MARK)
2058 if (fci->pointer_count + aflag == 1)
2059 warning ("format argument is not a pointer (arg %d)", arg_num);
2061 warning ("format argument is not a pointer to a pointer (arg %d)", arg_num);
2066 /* See if this is an attempt to write into a const type with
2067 scanf or with printf "%n". */
2068 if ((info->format_type == scanf_format_type
2069 || (info->format_type == printf_format_type
2070 && format_char == 'n'))
2071 && i == fci->pointer_count + aflag
2073 && TREE_CODE (cur_type) != ERROR_MARK
2074 && (TYPE_READONLY (cur_type)
2076 && (TREE_CODE_CLASS (TREE_CODE (cur_param)) == 'c'
2077 || (DECL_P (cur_param) && TREE_READONLY (cur_param))))))
2078 warning ("writing into constant object (arg %d)", arg_num);
2080 /* Check whether the argument type is a character type. This leniency
2081 only applies to certain formats, flagged with 'c'.
2083 if (TREE_CODE (cur_type) != ERROR_MARK && index (fci->flag_chars, 'c') != 0)
2084 char_type_flag = (TYPE_MAIN_VARIANT (cur_type) == char_type_node
2085 || TYPE_MAIN_VARIANT (cur_type) == signed_char_type_node
2086 || TYPE_MAIN_VARIANT (cur_type) == unsigned_char_type_node);
2088 /* Check the type of the "real" argument, if there's a type we want. */
2089 if (i == fci->pointer_count + aflag && wanted_type != 0
2090 && TREE_CODE (cur_type) != ERROR_MARK
2091 && wanted_type != TYPE_MAIN_VARIANT (cur_type)
2092 /* If we want `void *', allow any pointer type.
2093 (Anything else would already have got a warning.)
2094 With -pedantic, only allow pointers to void and to character
2097 && ! (wanted_type == void_type_node
2098 && fci->pointer_count > 0
2100 || TYPE_MAIN_VARIANT (cur_type) == void_type_node
2101 || (i == 1 && char_type_flag)))
2102 /* Don't warn about differences merely in signedness, unless
2103 -pedantic. With -pedantic, warn if the type is a pointer
2104 target and not a character type, and for character types at
2105 a second level of indirection.
2107 && !(TREE_CODE (wanted_type) == INTEGER_TYPE
2108 && TREE_CODE (TYPE_MAIN_VARIANT (cur_type)) == INTEGER_TYPE
2109 && (! pedantic || i == 0 || (i == 1 && char_type_flag))
2110 && (TREE_UNSIGNED (wanted_type)
2111 ? wanted_type == (cur_type = unsigned_type (cur_type))
2112 : wanted_type == (cur_type = signed_type (cur_type))))
2113 /* Likewise, "signed char", "unsigned char" and "char" are
2114 equivalent but the above test won't consider them equivalent. */
2115 && ! (wanted_type == char_type_node
2116 && (! pedantic || i < 2)
2119 register const char *this;
2120 register const char *that;
2122 this = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (wanted_type)));
2124 if (TREE_CODE (cur_type) != ERROR_MARK
2125 && TYPE_NAME (cur_type) != 0
2126 && TREE_CODE (cur_type) != INTEGER_TYPE
2127 && !(TREE_CODE (cur_type) == POINTER_TYPE
2128 && TREE_CODE (TREE_TYPE (cur_type)) == INTEGER_TYPE))
2130 if (TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL
2131 && DECL_NAME (TYPE_NAME (cur_type)) != 0)
2132 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type)));
2134 that = IDENTIFIER_POINTER (TYPE_NAME (cur_type));
2137 /* A nameless type can't possibly match what the format wants.
2138 So there will be a warning for it.
2139 Make up a string to describe vaguely what it is. */
2142 if (TREE_CODE (cur_type) == POINTER_TYPE)
2145 that = "different type";
2148 /* Make the warning better in case of mismatch of int vs long. */
2149 if (TREE_CODE (cur_type) == INTEGER_TYPE
2150 && TREE_CODE (wanted_type) == INTEGER_TYPE
2151 && TYPE_PRECISION (cur_type) == TYPE_PRECISION (wanted_type)
2152 && TYPE_NAME (cur_type) != 0
2153 && TREE_CODE (TYPE_NAME (cur_type)) == TYPE_DECL)
2154 that = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (cur_type)));
2156 if (strcmp (this, that) != 0)
2157 warning ("%s format, %s arg (arg %d)", this, that, arg_num);
2162 /* Print a warning if a constant expression had overflow in folding.
2163 Invoke this function on every expression that the language
2164 requires to be a constant expression.
2165 Note the ANSI C standard says it is erroneous for a
2166 constant expression to overflow. */
2169 constant_expression_warning (value)
2172 if ((TREE_CODE (value) == INTEGER_CST || TREE_CODE (value) == REAL_CST
2173 || TREE_CODE (value) == COMPLEX_CST)
2174 && TREE_CONSTANT_OVERFLOW (value) && pedantic)
2175 pedwarn ("overflow in constant expression");
2178 /* Print a warning if an expression had overflow in folding.
2179 Invoke this function on every expression that
2180 (1) appears in the source code, and
2181 (2) might be a constant expression that overflowed, and
2182 (3) is not already checked by convert_and_check;
2183 however, do not invoke this function on operands of explicit casts. */
2186 overflow_warning (value)
2189 if ((TREE_CODE (value) == INTEGER_CST
2190 || (TREE_CODE (value) == COMPLEX_CST
2191 && TREE_CODE (TREE_REALPART (value)) == INTEGER_CST))
2192 && TREE_OVERFLOW (value))
2194 TREE_OVERFLOW (value) = 0;
2195 if (skip_evaluation == 0)
2196 warning ("integer overflow in expression");
2198 else if ((TREE_CODE (value) == REAL_CST
2199 || (TREE_CODE (value) == COMPLEX_CST
2200 && TREE_CODE (TREE_REALPART (value)) == REAL_CST))
2201 && TREE_OVERFLOW (value))
2203 TREE_OVERFLOW (value) = 0;
2204 if (skip_evaluation == 0)
2205 warning ("floating point overflow in expression");
2209 /* Print a warning if a large constant is truncated to unsigned,
2210 or if -Wconversion is used and a constant < 0 is converted to unsigned.
2211 Invoke this function on every expression that might be implicitly
2212 converted to an unsigned type. */
2215 unsigned_conversion_warning (result, operand)
2216 tree result, operand;
2218 if (TREE_CODE (operand) == INTEGER_CST
2219 && TREE_CODE (TREE_TYPE (result)) == INTEGER_TYPE
2220 && TREE_UNSIGNED (TREE_TYPE (result))
2221 && skip_evaluation == 0
2222 && !int_fits_type_p (operand, TREE_TYPE (result)))
2224 if (!int_fits_type_p (operand, signed_type (TREE_TYPE (result))))
2225 /* This detects cases like converting -129 or 256 to unsigned char. */
2226 warning ("large integer implicitly truncated to unsigned type");
2227 else if (warn_conversion)
2228 warning ("negative integer implicitly converted to unsigned type");
2232 /* Convert EXPR to TYPE, warning about conversion problems with constants.
2233 Invoke this function on every expression that is converted implicitly,
2234 i.e. because of language rules and not because of an explicit cast. */
2237 convert_and_check (type, expr)
2240 tree t = convert (type, expr);
2241 if (TREE_CODE (t) == INTEGER_CST)
2243 if (TREE_OVERFLOW (t))
2245 TREE_OVERFLOW (t) = 0;
2247 /* Do not diagnose overflow in a constant expression merely
2248 because a conversion overflowed. */
2249 TREE_CONSTANT_OVERFLOW (t) = TREE_CONSTANT_OVERFLOW (expr);
2251 /* No warning for converting 0x80000000 to int. */
2252 if (!(TREE_UNSIGNED (type) < TREE_UNSIGNED (TREE_TYPE (expr))
2253 && TREE_CODE (TREE_TYPE (expr)) == INTEGER_TYPE
2254 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (expr))))
2255 /* If EXPR fits in the unsigned version of TYPE,
2256 don't warn unless pedantic. */
2258 || TREE_UNSIGNED (type)
2259 || ! int_fits_type_p (expr, unsigned_type (type)))
2260 && skip_evaluation == 0)
2261 warning ("overflow in implicit constant conversion");
2264 unsigned_conversion_warning (t, expr);
2270 c_expand_expr_stmt (expr)
2273 /* Do default conversion if safe and possibly important,
2274 in case within ({...}). */
2275 if ((TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE && lvalue_p (expr))
2276 || TREE_CODE (TREE_TYPE (expr)) == FUNCTION_TYPE)
2277 expr = default_conversion (expr);
2279 if (TREE_TYPE (expr) != error_mark_node
2280 && !COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (expr))
2281 && TREE_CODE (TREE_TYPE (expr)) != ARRAY_TYPE)
2282 error ("expression statement has incomplete type");
2284 expand_expr_stmt (expr);
2287 /* Validate the expression after `case' and apply default promotions. */
2290 check_case_value (value)
2293 if (value == NULL_TREE)
2296 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
2297 STRIP_TYPE_NOPS (value);
2299 if (TREE_CODE (value) != INTEGER_CST
2300 && value != error_mark_node)
2302 error ("case label does not reduce to an integer constant");
2303 value = error_mark_node;
2306 /* Promote char or short to int. */
2307 value = default_conversion (value);
2309 constant_expression_warning (value);
2314 /* Return an integer type with BITS bits of precision,
2315 that is unsigned if UNSIGNEDP is nonzero, otherwise signed. */
2318 type_for_size (bits, unsignedp)
2322 if (bits == TYPE_PRECISION (integer_type_node))
2323 return unsignedp ? unsigned_type_node : integer_type_node;
2325 if (bits == TYPE_PRECISION (signed_char_type_node))
2326 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2328 if (bits == TYPE_PRECISION (short_integer_type_node))
2329 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2331 if (bits == TYPE_PRECISION (long_integer_type_node))
2332 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2334 if (bits == TYPE_PRECISION (long_long_integer_type_node))
2335 return (unsignedp ? long_long_unsigned_type_node
2336 : long_long_integer_type_node);
2338 if (bits == TYPE_PRECISION (widest_integer_literal_type_node))
2339 return (unsignedp ? widest_unsigned_literal_type_node
2340 : widest_integer_literal_type_node);
2342 if (bits <= TYPE_PRECISION (intQI_type_node))
2343 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2345 if (bits <= TYPE_PRECISION (intHI_type_node))
2346 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2348 if (bits <= TYPE_PRECISION (intSI_type_node))
2349 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2351 if (bits <= TYPE_PRECISION (intDI_type_node))
2352 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2357 /* Return a data type that has machine mode MODE.
2358 If the mode is an integer,
2359 then UNSIGNEDP selects between signed and unsigned types. */
2362 type_for_mode (mode, unsignedp)
2363 enum machine_mode mode;
2366 if (mode == TYPE_MODE (integer_type_node))
2367 return unsignedp ? unsigned_type_node : integer_type_node;
2369 if (mode == TYPE_MODE (signed_char_type_node))
2370 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2372 if (mode == TYPE_MODE (short_integer_type_node))
2373 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2375 if (mode == TYPE_MODE (long_integer_type_node))
2376 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2378 if (mode == TYPE_MODE (long_long_integer_type_node))
2379 return unsignedp ? long_long_unsigned_type_node : long_long_integer_type_node;
2381 if (mode == TYPE_MODE (widest_integer_literal_type_node))
2382 return unsignedp ? widest_unsigned_literal_type_node
2383 : widest_integer_literal_type_node;
2385 if (mode == TYPE_MODE (intQI_type_node))
2386 return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
2388 if (mode == TYPE_MODE (intHI_type_node))
2389 return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
2391 if (mode == TYPE_MODE (intSI_type_node))
2392 return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
2394 if (mode == TYPE_MODE (intDI_type_node))
2395 return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
2397 #if HOST_BITS_PER_WIDE_INT >= 64
2398 if (mode == TYPE_MODE (intTI_type_node))
2399 return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
2402 if (mode == TYPE_MODE (float_type_node))
2403 return float_type_node;
2405 if (mode == TYPE_MODE (double_type_node))
2406 return double_type_node;
2408 if (mode == TYPE_MODE (long_double_type_node))
2409 return long_double_type_node;
2411 if (mode == TYPE_MODE (build_pointer_type (char_type_node)))
2412 return build_pointer_type (char_type_node);
2414 if (mode == TYPE_MODE (build_pointer_type (integer_type_node)))
2415 return build_pointer_type (integer_type_node);
2417 #ifdef VECTOR_MODE_SUPPORTED_P
2418 if (mode == TYPE_MODE (V4SF_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2419 return V4SF_type_node;
2420 if (mode == TYPE_MODE (V4SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2421 return V4SI_type_node;
2422 if (mode == TYPE_MODE (V2SI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2423 return V2SI_type_node;
2424 if (mode == TYPE_MODE (V4HI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2425 return V4HI_type_node;
2426 if (mode == TYPE_MODE (V8QI_type_node) && VECTOR_MODE_SUPPORTED_P (mode))
2427 return V8QI_type_node;
2433 /* Return an unsigned type the same as TYPE in other respects. */
2435 unsigned_type (type)
2438 tree type1 = TYPE_MAIN_VARIANT (type);
2439 if (type1 == signed_char_type_node || type1 == char_type_node)
2440 return unsigned_char_type_node;
2441 if (type1 == integer_type_node)
2442 return unsigned_type_node;
2443 if (type1 == short_integer_type_node)
2444 return short_unsigned_type_node;
2445 if (type1 == long_integer_type_node)
2446 return long_unsigned_type_node;
2447 if (type1 == long_long_integer_type_node)
2448 return long_long_unsigned_type_node;
2449 if (type1 == widest_integer_literal_type_node)
2450 return widest_unsigned_literal_type_node;
2451 #if HOST_BITS_PER_WIDE_INT >= 64
2452 if (type1 == intTI_type_node)
2453 return unsigned_intTI_type_node;
2455 if (type1 == intDI_type_node)
2456 return unsigned_intDI_type_node;
2457 if (type1 == intSI_type_node)
2458 return unsigned_intSI_type_node;
2459 if (type1 == intHI_type_node)
2460 return unsigned_intHI_type_node;
2461 if (type1 == intQI_type_node)
2462 return unsigned_intQI_type_node;
2464 return signed_or_unsigned_type (1, type);
2467 /* Return a signed type the same as TYPE in other respects. */
2473 tree type1 = TYPE_MAIN_VARIANT (type);
2474 if (type1 == unsigned_char_type_node || type1 == char_type_node)
2475 return signed_char_type_node;
2476 if (type1 == unsigned_type_node)
2477 return integer_type_node;
2478 if (type1 == short_unsigned_type_node)
2479 return short_integer_type_node;
2480 if (type1 == long_unsigned_type_node)
2481 return long_integer_type_node;
2482 if (type1 == long_long_unsigned_type_node)
2483 return long_long_integer_type_node;
2484 if (type1 == widest_unsigned_literal_type_node)
2485 return widest_integer_literal_type_node;
2486 #if HOST_BITS_PER_WIDE_INT >= 64
2487 if (type1 == unsigned_intTI_type_node)
2488 return intTI_type_node;
2490 if (type1 == unsigned_intDI_type_node)
2491 return intDI_type_node;
2492 if (type1 == unsigned_intSI_type_node)
2493 return intSI_type_node;
2494 if (type1 == unsigned_intHI_type_node)
2495 return intHI_type_node;
2496 if (type1 == unsigned_intQI_type_node)
2497 return intQI_type_node;
2499 return signed_or_unsigned_type (0, type);
2502 /* Return a type the same as TYPE except unsigned or
2503 signed according to UNSIGNEDP. */
2506 signed_or_unsigned_type (unsignedp, type)
2510 if (! INTEGRAL_TYPE_P (type)
2511 || TREE_UNSIGNED (type) == unsignedp)
2514 if (TYPE_PRECISION (type) == TYPE_PRECISION (signed_char_type_node))
2515 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
2516 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
2517 return unsignedp ? unsigned_type_node : integer_type_node;
2518 if (TYPE_PRECISION (type) == TYPE_PRECISION (short_integer_type_node))
2519 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
2520 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_integer_type_node))
2521 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
2522 if (TYPE_PRECISION (type) == TYPE_PRECISION (long_long_integer_type_node))
2523 return (unsignedp ? long_long_unsigned_type_node
2524 : long_long_integer_type_node);
2525 if (TYPE_PRECISION (type) == TYPE_PRECISION (widest_integer_literal_type_node))
2526 return (unsignedp ? widest_unsigned_literal_type_node
2527 : widest_integer_literal_type_node);
2531 /* Return the minimum number of bits needed to represent VALUE in a
2532 signed or unsigned type, UNSIGNEDP says which. */
2535 min_precision (value, unsignedp)
2541 /* If the value is negative, compute its negative minus 1. The latter
2542 adjustment is because the absolute value of the largest negative value
2543 is one larger than the largest positive value. This is equivalent to
2544 a bit-wise negation, so use that operation instead. */
2546 if (tree_int_cst_sgn (value) < 0)
2547 value = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (value), value));
2549 /* Return the number of bits needed, taking into account the fact
2550 that we need one more bit for a signed than unsigned type. */
2552 if (integer_zerop (value))
2555 log = tree_floor_log2 (value);
2557 return log + 1 + ! unsignedp;
2560 /* Print an error message for invalid operands to arith operation CODE.
2561 NOP_EXPR is used as a special case (see truthvalue_conversion). */
2564 binary_op_error (code)
2565 enum tree_code code;
2567 register const char *opname;
2572 error ("invalid truth-value expression");
2576 opname = "+"; break;
2578 opname = "-"; break;
2580 opname = "*"; break;
2582 opname = "max"; break;
2584 opname = "min"; break;
2586 opname = "=="; break;
2588 opname = "!="; break;
2590 opname = "<="; break;
2592 opname = ">="; break;
2594 opname = "<"; break;
2596 opname = ">"; break;
2598 opname = "<<"; break;
2600 opname = ">>"; break;
2601 case TRUNC_MOD_EXPR:
2602 case FLOOR_MOD_EXPR:
2603 opname = "%"; break;
2604 case TRUNC_DIV_EXPR:
2605 case FLOOR_DIV_EXPR:
2606 opname = "/"; break;
2608 opname = "&"; break;
2610 opname = "|"; break;
2611 case TRUTH_ANDIF_EXPR:
2612 opname = "&&"; break;
2613 case TRUTH_ORIF_EXPR:
2614 opname = "||"; break;
2616 opname = "^"; break;
2619 opname = "rotate"; break;
2621 opname = "unknown"; break;
2623 error ("invalid operands to binary %s", opname);
2626 /* Subroutine of build_binary_op, used for comparison operations.
2627 See if the operands have both been converted from subword integer types
2628 and, if so, perhaps change them both back to their original type.
2629 This function is also responsible for converting the two operands
2630 to the proper common type for comparison.
2632 The arguments of this function are all pointers to local variables
2633 of build_binary_op: OP0_PTR is &OP0, OP1_PTR is &OP1,
2634 RESTYPE_PTR is &RESULT_TYPE and RESCODE_PTR is &RESULTCODE.
2636 If this function returns nonzero, it means that the comparison has
2637 a constant value. What this function returns is an expression for
2641 shorten_compare (op0_ptr, op1_ptr, restype_ptr, rescode_ptr)
2642 tree *op0_ptr, *op1_ptr;
2644 enum tree_code *rescode_ptr;
2647 tree op0 = *op0_ptr;
2648 tree op1 = *op1_ptr;
2649 int unsignedp0, unsignedp1;
2651 tree primop0, primop1;
2652 enum tree_code code = *rescode_ptr;
2654 /* Throw away any conversions to wider types
2655 already present in the operands. */
2657 primop0 = get_narrower (op0, &unsignedp0);
2658 primop1 = get_narrower (op1, &unsignedp1);
2660 /* Handle the case that OP0 does not *contain* a conversion
2661 but it *requires* conversion to FINAL_TYPE. */
2663 if (op0 == primop0 && TREE_TYPE (op0) != *restype_ptr)
2664 unsignedp0 = TREE_UNSIGNED (TREE_TYPE (op0));
2665 if (op1 == primop1 && TREE_TYPE (op1) != *restype_ptr)
2666 unsignedp1 = TREE_UNSIGNED (TREE_TYPE (op1));
2668 /* If one of the operands must be floated, we cannot optimize. */
2669 real1 = TREE_CODE (TREE_TYPE (primop0)) == REAL_TYPE;
2670 real2 = TREE_CODE (TREE_TYPE (primop1)) == REAL_TYPE;
2672 /* If first arg is constant, swap the args (changing operation
2673 so value is preserved), for canonicalization. Don't do this if
2674 the second arg is 0. */
2676 if (TREE_CONSTANT (primop0)
2677 && ! integer_zerop (primop1) && ! real_zerop (primop1))
2679 register tree tem = primop0;
2680 register int temi = unsignedp0;
2688 unsignedp0 = unsignedp1;
2711 *rescode_ptr = code;
2714 /* If comparing an integer against a constant more bits wide,
2715 maybe we can deduce a value of 1 or 0 independent of the data.
2716 Or else truncate the constant now
2717 rather than extend the variable at run time.
2719 This is only interesting if the constant is the wider arg.
2720 Also, it is not safe if the constant is unsigned and the
2721 variable arg is signed, since in this case the variable
2722 would be sign-extended and then regarded as unsigned.
2723 Our technique fails in this case because the lowest/highest
2724 possible unsigned results don't follow naturally from the
2725 lowest/highest possible values of the variable operand.
2726 For just EQ_EXPR and NE_EXPR there is another technique that
2727 could be used: see if the constant can be faithfully represented
2728 in the other operand's type, by truncating it and reextending it
2729 and see if that preserves the constant's value. */
2731 if (!real1 && !real2
2732 && TREE_CODE (primop1) == INTEGER_CST
2733 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr))
2735 int min_gt, max_gt, min_lt, max_lt;
2736 tree maxval, minval;
2737 /* 1 if comparison is nominally unsigned. */
2738 int unsignedp = TREE_UNSIGNED (*restype_ptr);
2741 type = signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0));
2743 /* If TYPE is an enumeration, then we need to get its min/max
2744 values from it's underlying integral type, not the enumerated
2746 if (TREE_CODE (type) == ENUMERAL_TYPE)
2747 type = type_for_size (TYPE_PRECISION (type), unsignedp0);
2749 maxval = TYPE_MAX_VALUE (type);
2750 minval = TYPE_MIN_VALUE (type);
2752 if (unsignedp && !unsignedp0)
2753 *restype_ptr = signed_type (*restype_ptr);
2755 if (TREE_TYPE (primop1) != *restype_ptr)
2756 primop1 = convert (*restype_ptr, primop1);
2757 if (type != *restype_ptr)
2759 minval = convert (*restype_ptr, minval);
2760 maxval = convert (*restype_ptr, maxval);
2763 if (unsignedp && unsignedp0)
2765 min_gt = INT_CST_LT_UNSIGNED (primop1, minval);
2766 max_gt = INT_CST_LT_UNSIGNED (primop1, maxval);
2767 min_lt = INT_CST_LT_UNSIGNED (minval, primop1);
2768 max_lt = INT_CST_LT_UNSIGNED (maxval, primop1);
2772 min_gt = INT_CST_LT (primop1, minval);
2773 max_gt = INT_CST_LT (primop1, maxval);
2774 min_lt = INT_CST_LT (minval, primop1);
2775 max_lt = INT_CST_LT (maxval, primop1);
2779 /* This used to be a switch, but Genix compiler can't handle that. */
2780 if (code == NE_EXPR)
2782 if (max_lt || min_gt)
2783 val = boolean_true_node;
2785 else if (code == EQ_EXPR)
2787 if (max_lt || min_gt)
2788 val = boolean_false_node;
2790 else if (code == LT_EXPR)
2793 val = boolean_true_node;
2795 val = boolean_false_node;
2797 else if (code == GT_EXPR)
2800 val = boolean_true_node;
2802 val = boolean_false_node;
2804 else if (code == LE_EXPR)
2807 val = boolean_true_node;
2809 val = boolean_false_node;
2811 else if (code == GE_EXPR)
2814 val = boolean_true_node;
2816 val = boolean_false_node;
2819 /* If primop0 was sign-extended and unsigned comparison specd,
2820 we did a signed comparison above using the signed type bounds.
2821 But the comparison we output must be unsigned.
2823 Also, for inequalities, VAL is no good; but if the signed
2824 comparison had *any* fixed result, it follows that the
2825 unsigned comparison just tests the sign in reverse
2826 (positive values are LE, negative ones GE).
2827 So we can generate an unsigned comparison
2828 against an extreme value of the signed type. */
2830 if (unsignedp && !unsignedp0)
2837 primop1 = TYPE_MIN_VALUE (type);
2843 primop1 = TYPE_MAX_VALUE (type);
2850 type = unsigned_type (type);
2853 if (!max_gt && !unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
2855 /* This is the case of (char)x >?< 0x80, which people used to use
2856 expecting old C compilers to change the 0x80 into -0x80. */
2857 if (val == boolean_false_node)
2858 warning ("comparison is always false due to limited range of data type");
2859 if (val == boolean_true_node)
2860 warning ("comparison is always true due to limited range of data type");
2863 if (!min_lt && unsignedp0 && TREE_CODE (primop0) != INTEGER_CST)
2865 /* This is the case of (unsigned char)x >?< -1 or < 0. */
2866 if (val == boolean_false_node)
2867 warning ("comparison is always false due to limited range of data type");
2868 if (val == boolean_true_node)
2869 warning ("comparison is always true due to limited range of data type");
2874 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2875 if (TREE_SIDE_EFFECTS (primop0))
2876 return build (COMPOUND_EXPR, TREE_TYPE (val), primop0, val);
2880 /* Value is not predetermined, but do the comparison
2881 in the type of the operand that is not constant.
2882 TYPE is already properly set. */
2884 else if (real1 && real2
2885 && (TYPE_PRECISION (TREE_TYPE (primop0))
2886 == TYPE_PRECISION (TREE_TYPE (primop1))))
2887 type = TREE_TYPE (primop0);
2889 /* If args' natural types are both narrower than nominal type
2890 and both extend in the same manner, compare them
2891 in the type of the wider arg.
2892 Otherwise must actually extend both to the nominal
2893 common type lest different ways of extending
2895 (eg, (short)-1 == (unsigned short)-1 should be 0.) */
2897 else if (unsignedp0 == unsignedp1 && real1 == real2
2898 && TYPE_PRECISION (TREE_TYPE (primop0)) < TYPE_PRECISION (*restype_ptr)
2899 && TYPE_PRECISION (TREE_TYPE (primop1)) < TYPE_PRECISION (*restype_ptr))
2901 type = common_type (TREE_TYPE (primop0), TREE_TYPE (primop1));
2902 type = signed_or_unsigned_type (unsignedp0
2903 || TREE_UNSIGNED (*restype_ptr),
2905 /* Make sure shorter operand is extended the right way
2906 to match the longer operand. */
2907 primop0 = convert (signed_or_unsigned_type (unsignedp0, TREE_TYPE (primop0)),
2909 primop1 = convert (signed_or_unsigned_type (unsignedp1, TREE_TYPE (primop1)),
2914 /* Here we must do the comparison on the nominal type
2915 using the args exactly as we received them. */
2916 type = *restype_ptr;
2920 if (!real1 && !real2 && integer_zerop (primop1)
2921 && TREE_UNSIGNED (*restype_ptr))
2927 /* All unsigned values are >= 0, so we warn if extra warnings
2928 are requested. However, if OP0 is a constant that is
2929 >= 0, the signedness of the comparison isn't an issue,
2930 so suppress the warning. */
2931 if (extra_warnings && !in_system_header
2932 && ! (TREE_CODE (primop0) == INTEGER_CST
2933 && ! TREE_OVERFLOW (convert (signed_type (type),
2935 warning ("comparison of unsigned expression >= 0 is always true");
2936 value = boolean_true_node;
2940 if (extra_warnings && !in_system_header
2941 && ! (TREE_CODE (primop0) == INTEGER_CST
2942 && ! TREE_OVERFLOW (convert (signed_type (type),
2944 warning ("comparison of unsigned expression < 0 is always false");
2945 value = boolean_false_node;
2954 /* Don't forget to evaluate PRIMOP0 if it has side effects. */
2955 if (TREE_SIDE_EFFECTS (primop0))
2956 return build (COMPOUND_EXPR, TREE_TYPE (value),
2963 *op0_ptr = convert (type, primop0);
2964 *op1_ptr = convert (type, primop1);
2966 *restype_ptr = boolean_type_node;
2971 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
2972 or validate its data type for an `if' or `while' statement or ?..: exp.
2974 This preparation consists of taking the ordinary
2975 representation of an expression expr and producing a valid tree
2976 boolean expression describing whether expr is nonzero. We could
2977 simply always do build_binary_op (NE_EXPR, expr, boolean_false_node, 1),
2978 but we optimize comparisons, &&, ||, and !.
2980 The resulting type should always be `boolean_type_node'. */
2983 truthvalue_conversion (expr)
2986 if (TREE_CODE (expr) == ERROR_MARK)
2989 #if 0 /* This appears to be wrong for C++. */
2990 /* These really should return error_mark_node after 2.4 is stable.
2991 But not all callers handle ERROR_MARK properly. */
2992 switch (TREE_CODE (TREE_TYPE (expr)))
2995 error ("struct type value used where scalar is required");
2996 return boolean_false_node;
2999 error ("union type value used where scalar is required");
3000 return boolean_false_node;
3003 error ("array type value used where scalar is required");
3004 return boolean_false_node;
3011 switch (TREE_CODE (expr))
3014 case NE_EXPR: case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
3015 case TRUTH_ANDIF_EXPR:
3016 case TRUTH_ORIF_EXPR:
3017 case TRUTH_AND_EXPR:
3019 case TRUTH_XOR_EXPR:
3020 case TRUTH_NOT_EXPR:
3021 TREE_TYPE (expr) = boolean_type_node;
3028 return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
3031 return real_zerop (expr) ? boolean_false_node : boolean_true_node;
3034 /* If we are taking the address of a external decl, it might be zero
3035 if it is weak, so we cannot optimize. */
3036 if (DECL_P (TREE_OPERAND (expr, 0))
3037 && DECL_EXTERNAL (TREE_OPERAND (expr, 0)))
3040 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 0)))
3041 return build (COMPOUND_EXPR, boolean_type_node,
3042 TREE_OPERAND (expr, 0), boolean_true_node);
3044 return boolean_true_node;
3047 return build_binary_op ((TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1))
3048 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3049 truthvalue_conversion (TREE_OPERAND (expr, 0)),
3050 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3057 /* These don't change whether an object is non-zero or zero. */
3058 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3062 /* These don't change whether an object is zero or non-zero, but
3063 we can't ignore them if their second arg has side-effects. */
3064 if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
3065 return build (COMPOUND_EXPR, boolean_type_node, TREE_OPERAND (expr, 1),
3066 truthvalue_conversion (TREE_OPERAND (expr, 0)));
3068 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3071 /* Distribute the conversion into the arms of a COND_EXPR. */
3072 return fold (build (COND_EXPR, boolean_type_node, TREE_OPERAND (expr, 0),
3073 truthvalue_conversion (TREE_OPERAND (expr, 1)),
3074 truthvalue_conversion (TREE_OPERAND (expr, 2))));
3077 /* Don't cancel the effect of a CONVERT_EXPR from a REFERENCE_TYPE,
3078 since that affects how `default_conversion' will behave. */
3079 if (TREE_CODE (TREE_TYPE (expr)) == REFERENCE_TYPE
3080 || TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == REFERENCE_TYPE)
3082 /* fall through... */
3084 /* If this is widening the argument, we can ignore it. */
3085 if (TYPE_PRECISION (TREE_TYPE (expr))
3086 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (expr, 0))))
3087 return truthvalue_conversion (TREE_OPERAND (expr, 0));
3091 /* With IEEE arithmetic, x - x may not equal 0, so we can't optimize
3093 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
3094 && TREE_CODE (TREE_TYPE (expr)) == REAL_TYPE)
3096 /* fall through... */
3098 /* This and MINUS_EXPR can be changed into a comparison of the
3100 if (TREE_TYPE (TREE_OPERAND (expr, 0))
3101 == TREE_TYPE (TREE_OPERAND (expr, 1)))
3102 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3103 TREE_OPERAND (expr, 1), 1);
3104 return build_binary_op (NE_EXPR, TREE_OPERAND (expr, 0),
3105 fold (build1 (NOP_EXPR,
3106 TREE_TYPE (TREE_OPERAND (expr, 0)),
3107 TREE_OPERAND (expr, 1))), 1);
3110 if (integer_onep (TREE_OPERAND (expr, 1))
3111 && TREE_TYPE (expr) != boolean_type_node)
3112 /* Using convert here would cause infinite recursion. */
3113 return build1 (NOP_EXPR, boolean_type_node, expr);
3117 if (warn_parentheses && C_EXP_ORIGINAL_CODE (expr) == MODIFY_EXPR)
3118 warning ("suggest parentheses around assignment used as truth value");
3125 if (TREE_CODE (TREE_TYPE (expr)) == COMPLEX_TYPE)
3127 tree tem = save_expr (expr);
3128 return (build_binary_op
3129 ((TREE_SIDE_EFFECTS (expr)
3130 ? TRUTH_OR_EXPR : TRUTH_ORIF_EXPR),
3131 truthvalue_conversion (build_unary_op (REALPART_EXPR, tem, 0)),
3132 truthvalue_conversion (build_unary_op (IMAGPART_EXPR, tem, 0)),
3136 return build_binary_op (NE_EXPR, expr, integer_zero_node, 1);
3140 /* Read the rest of a #-directive from input stream FINPUT.
3141 In normal use, the directive name and the white space after it
3142 have already been read, so they won't be included in the result.
3143 We allow for the fact that the directive line may contain
3144 a newline embedded within a character or string literal which forms
3145 a part of the directive.
3147 The value is a string in a reusable buffer. It remains valid
3148 only until the next time this function is called. */
3149 unsigned char *yy_cur, *yy_lim;
3151 #define GETC() (yy_cur < yy_lim ? *yy_cur++ : yy_get_token ())
3152 #define UNGETC(c) ((c) == EOF ? 0 : yy_cur--)
3159 parse_in.limit = parse_in.token_buffer;
3160 cpp_token = cpp_get_token (&parse_in);
3161 if (cpp_token == CPP_EOF)
3163 yy_lim = CPP_PWRITTEN (&parse_in);
3164 yy_cur = parse_in.token_buffer;
3165 if (yy_cur < yy_lim)
3171 get_directive_line ()
3173 static char *directive_buffer = NULL;
3174 static unsigned buffer_length = 0;
3176 register char *buffer_limit;
3177 register int looking_for = 0;
3178 register int char_escaped = 0;
3180 if (buffer_length == 0)
3182 directive_buffer = (char *)xmalloc (128);
3183 buffer_length = 128;
3186 buffer_limit = &directive_buffer[buffer_length];
3188 for (p = directive_buffer; ; )
3192 /* Make buffer bigger if it is full. */
3193 if (p >= buffer_limit)
3195 register unsigned bytes_used = (p - directive_buffer);
3199 = (char *)xrealloc (directive_buffer, buffer_length);
3200 p = &directive_buffer[bytes_used];
3201 buffer_limit = &directive_buffer[buffer_length];
3206 /* Discard initial whitespace. */
3207 if ((c == ' ' || c == '\t') && p == directive_buffer)
3210 /* Detect the end of the directive. */
3211 if (c == '\n' && looking_for == 0)
3220 return directive_buffer;
3222 /* Handle string and character constant syntax. */
3225 if (looking_for == c && !char_escaped)
3226 looking_for = 0; /* Found terminator... stop looking. */
3229 if (c == '\'' || c == '"')
3230 looking_for = c; /* Don't stop buffering until we see another
3231 another one of these (or an EOF). */
3233 /* Handle backslash. */
3234 char_escaped = (c == '\\' && ! char_escaped);
3238 /* Read the rest of a #-directive from input stream FINPUT.
3239 In normal use, the directive name and the white space after it
3240 have already been read, so they won't be included in the result.
3241 We allow for the fact that the directive line may contain
3242 a newline embedded within a character or string literal which forms
3243 a part of the directive.
3245 The value is a string in a reusable buffer. It remains valid
3246 only until the next time this function is called.
3248 The terminating character ('\n' or EOF) is left in FINPUT for the
3249 caller to re-read. */
3252 get_directive_line (finput)
3253 register FILE *finput;
3255 static char *directive_buffer = NULL;
3256 static unsigned buffer_length = 0;
3258 register char *buffer_limit;
3259 register int looking_for = 0;
3260 register int char_escaped = 0;
3262 if (buffer_length == 0)
3264 directive_buffer = (char *)xmalloc (128);
3265 buffer_length = 128;
3268 buffer_limit = &directive_buffer[buffer_length];
3270 for (p = directive_buffer; ; )
3274 /* Make buffer bigger if it is full. */
3275 if (p >= buffer_limit)
3277 register unsigned bytes_used = (p - directive_buffer);
3281 = (char *)xrealloc (directive_buffer, buffer_length);
3282 p = &directive_buffer[bytes_used];
3283 buffer_limit = &directive_buffer[buffer_length];
3288 /* Discard initial whitespace. */
3289 if ((c == ' ' || c == '\t') && p == directive_buffer)
3292 /* Detect the end of the directive. */
3293 if (looking_for == 0
3294 && (c == '\n' || c == EOF))
3303 return directive_buffer;
3305 /* Handle string and character constant syntax. */
3308 if (looking_for == c && !char_escaped)
3309 looking_for = 0; /* Found terminator... stop looking. */
3312 if (c == '\'' || c == '"')
3313 looking_for = c; /* Don't stop buffering until we see another
3314 one of these (or an EOF). */
3316 /* Handle backslash. */
3317 char_escaped = (c == '\\' && ! char_escaped);
3320 #endif /* !USE_CPPLIB */
3322 /* Make a variant type in the proper way for C/C++, propagating qualifiers
3323 down to the element type of an array. */
3326 c_build_qualified_type (type, type_quals)
3330 /* A restrict-qualified pointer type must be a pointer to object or
3331 incomplete type. Note that the use of POINTER_TYPE_P also allows
3332 REFERENCE_TYPEs, which is appropriate for C++. Unfortunately,
3333 the C++ front-end also use POINTER_TYPE for pointer-to-member
3334 values, so even though it should be illegal to use `restrict'
3335 with such an entity we don't flag that here. Thus, special case
3336 code for that case is required in the C++ front-end. */
3337 if ((type_quals & TYPE_QUAL_RESTRICT)
3338 && (!POINTER_TYPE_P (type)
3339 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type))))
3341 error ("invalid use of `restrict'");
3342 type_quals &= ~TYPE_QUAL_RESTRICT;
3345 if (TREE_CODE (type) == ARRAY_TYPE)
3346 return build_array_type (c_build_qualified_type (TREE_TYPE (type),
3348 TYPE_DOMAIN (type));
3349 return build_qualified_type (type, type_quals);
3352 /* Apply the TYPE_QUALS to the new DECL. */
3355 c_apply_type_quals_to_decl (type_quals, decl)
3359 if ((type_quals & TYPE_QUAL_CONST)
3360 || (TREE_TYPE (decl)
3361 && TREE_CODE (TREE_TYPE (decl)) == REFERENCE_TYPE))
3362 TREE_READONLY (decl) = 1;
3363 if (type_quals & TYPE_QUAL_VOLATILE)
3365 TREE_SIDE_EFFECTS (decl) = 1;
3366 TREE_THIS_VOLATILE (decl) = 1;
3368 if (type_quals & TYPE_QUAL_RESTRICT)
3370 if (!TREE_TYPE (decl)
3371 || !POINTER_TYPE_P (TREE_TYPE (decl))
3372 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (TREE_TYPE (decl))))
3373 error ("invalid use of `restrict'");
3374 else if (flag_strict_aliasing)
3376 /* No two restricted pointers can point at the same thing.
3377 However, a restricted pointer can point at the same thing
3378 as an unrestricted pointer, if that unrestricted pointer
3379 is based on the restricted pointer. So, we make the
3380 alias set for the restricted pointer a subset of the
3381 alias set for the type pointed to by the type of the
3384 HOST_WIDE_INT pointed_to_alias_set
3385 = get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
3387 if (pointed_to_alias_set == 0)
3388 /* It's not legal to make a subset of alias set zero. */
3392 DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();
3393 record_alias_subset (pointed_to_alias_set,
3394 DECL_POINTER_ALIAS_SET (decl));
3401 /* Return the typed-based alias set for T, which may be an expression
3402 or a type. Return -1 if we don't do anything special. */
3405 lang_get_alias_set (t)
3410 /* Permit type-punning when accessing a union, provided the access
3411 is directly through the union. For example, this code does not
3412 permit taking the address of a union member and then storing
3413 through it. Even the type-punning allowed here is a GCC
3414 extension, albeit a common and useful one; the C standard says
3415 that such accesses have implementation-defined behavior. */
3417 TREE_CODE (u) == COMPONENT_REF || TREE_CODE (u) == ARRAY_REF;
3418 u = TREE_OPERAND (u, 0))
3419 if (TREE_CODE (u) == COMPONENT_REF
3420 && TREE_CODE (TREE_TYPE (TREE_OPERAND (u, 0))) == UNION_TYPE)
3423 /* If this is a char *, the ANSI C standard says it can alias
3424 anything. Note that all references need do this. */
3425 if (TREE_CODE_CLASS (TREE_CODE (t)) == 'r'
3426 && TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
3427 && TYPE_PRECISION (TREE_TYPE (t)) == TYPE_PRECISION (char_type_node))
3430 /* That's all the expressions we handle specially. */
3434 /* The C standard specifically allows aliasing between signed and
3435 unsigned variants of the same type. We treat the signed
3436 variant as canonical. */
3437 if (TREE_CODE (t) == INTEGER_TYPE && TREE_UNSIGNED (t))
3439 tree t1 = signed_type (t);
3441 /* t1 == t can happen for boolean nodes which are always unsigned. */
3443 return get_alias_set (t1);
3445 else if (POINTER_TYPE_P (t))
3449 /* Unfortunately, there is no canonical form of a pointer type.
3450 In particular, if we have `typedef int I', then `int *', and
3451 `I *' are different types. So, we have to pick a canonical
3452 representative. We do this below.
3454 Technically, this approach is actually more conservative that
3455 it needs to be. In particular, `const int *' and `int *'
3456 chould be in different alias sets, according to the C and C++
3457 standard, since their types are not the same, and so,
3458 technically, an `int **' and `const int **' cannot point at
3461 But, the standard is wrong. In particular, this code is
3466 const int* const* cipp = &ip;
3468 And, it doesn't make sense for that to be legal unless you
3469 can dereference IPP and CIPP. So, we ignore cv-qualifiers on
3470 the pointed-to types. This issue has been reported to the
3472 t1 = TYPE_MAIN_VARIANT (TREE_TYPE (t));
3473 t1 = ((TREE_CODE (t) == POINTER_TYPE)
3474 ? build_pointer_type (t1) : build_reference_type (t1));
3476 return get_alias_set (t1);
3478 /* It's not yet safe to use alias sets for classes in C++ because
3479 the TYPE_FIELDs list for a class doesn't mention base classes. */
3480 else if (c_language == clk_cplusplus && AGGREGATE_TYPE_P (t))
3486 /* Build tree nodes and builtin functions common to both C and C++ language
3488 CPLUS_MODE is nonzero if we are called from the C++ frontend, we generate
3489 some stricter prototypes in that case.
3490 NO_BUILTINS and NO_NONANSI_BUILTINS contain the respective values of
3491 the language frontend flags flag_no_builtin and
3492 flag_no_nonansi_builtin. */
3495 c_common_nodes_and_builtins (cplus_mode, no_builtins, no_nonansi_builtins)
3496 int cplus_mode, no_builtins, no_nonansi_builtins;
3499 tree memcpy_ftype, memset_ftype, strlen_ftype;
3500 tree bzero_ftype, bcmp_ftype;
3501 tree endlink, int_endlink, double_endlink, unsigned_endlink;
3502 tree sizetype_endlink;
3503 tree ptr_ftype, ptr_ftype_unsigned;
3504 tree void_ftype_any, void_ftype_int, int_ftype_any;
3505 tree double_ftype_double, double_ftype_double_double;
3506 tree float_ftype_float, ldouble_ftype_ldouble;
3507 tree int_ftype_cptr_cptr_sizet;
3508 tree int_ftype_string_string, string_ftype_ptr_ptr;
3509 tree long_ftype_long;
3510 /* Either char* or void*. */
3511 tree traditional_ptr_type_node;
3512 /* Either const char* or const void*. */
3513 tree traditional_cptr_type_node;
3514 tree traditional_len_type_node;
3515 tree traditional_len_endlink;
3516 tree va_list_ref_type_node;
3517 tree va_list_arg_type_node;
3519 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_va_list"),
3520 va_list_type_node));
3522 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_ptrdiff_t"),
3523 ptrdiff_type_node));
3525 pushdecl (build_decl (TYPE_DECL, get_identifier ("__builtin_size_t"),
3528 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
3530 va_list_arg_type_node = va_list_ref_type_node =
3531 build_pointer_type (TREE_TYPE (va_list_type_node));
3535 va_list_arg_type_node = va_list_type_node;
3536 va_list_ref_type_node = build_reference_type (va_list_type_node);
3539 endlink = void_list_node;
3540 int_endlink = tree_cons (NULL_TREE, integer_type_node, endlink);
3541 double_endlink = tree_cons (NULL_TREE, double_type_node, endlink);
3542 unsigned_endlink = tree_cons (NULL_TREE, unsigned_type_node, endlink);
3544 ptr_ftype = build_function_type (ptr_type_node, NULL_TREE);
3545 ptr_ftype_unsigned = build_function_type (ptr_type_node, unsigned_endlink);
3546 sizetype_endlink = tree_cons (NULL_TREE, TYPE_DOMAIN (sizetype), endlink);
3547 /* We realloc here because sizetype could be int or unsigned. S'ok. */
3548 ptr_ftype_sizetype = build_function_type (ptr_type_node, sizetype_endlink);
3550 int_ftype_any = build_function_type (integer_type_node, NULL_TREE);
3551 void_ftype_any = build_function_type (void_type_node, NULL_TREE);
3552 void_ftype = build_function_type (void_type_node, endlink);
3553 void_ftype_int = build_function_type (void_type_node, int_endlink);
3555 = build_function_type (void_type_node,
3556 tree_cons (NULL_TREE, ptr_type_node, endlink));
3559 = build_function_type (float_type_node,
3560 tree_cons (NULL_TREE, float_type_node, endlink));
3563 = build_function_type (double_type_node, double_endlink);
3565 ldouble_ftype_ldouble
3566 = build_function_type (long_double_type_node,
3567 tree_cons (NULL_TREE, long_double_type_node,
3570 double_ftype_double_double
3571 = build_function_type (double_type_node,
3572 tree_cons (NULL_TREE, double_type_node,
3576 = build_function_type (integer_type_node, int_endlink);
3579 = build_function_type (long_integer_type_node,
3580 tree_cons (NULL_TREE, long_integer_type_node,
3583 int_ftype_cptr_cptr_sizet
3584 = build_function_type (integer_type_node,
3585 tree_cons (NULL_TREE, const_ptr_type_node,
3586 tree_cons (NULL_TREE, const_ptr_type_node,
3587 tree_cons (NULL_TREE,
3591 /* Prototype for strcpy. */
3592 string_ftype_ptr_ptr
3593 = build_function_type (string_type_node,
3594 tree_cons (NULL_TREE, string_type_node,
3595 tree_cons (NULL_TREE,
3596 const_string_type_node,
3599 traditional_len_type_node = (flag_traditional && ! cplus_mode
3600 ? integer_type_node : sizetype);
3601 traditional_len_endlink = tree_cons (NULL_TREE, traditional_len_type_node,
3604 /* Prototype for strcmp. */
3605 int_ftype_string_string
3606 = build_function_type (integer_type_node,
3607 tree_cons (NULL_TREE, const_string_type_node,
3608 tree_cons (NULL_TREE,
3609 const_string_type_node,
3612 /* Prototype for strlen. */
3614 = build_function_type (traditional_len_type_node,
3615 tree_cons (NULL_TREE, const_string_type_node,
3618 traditional_ptr_type_node = (flag_traditional && ! cplus_mode
3619 ? string_type_node : ptr_type_node);
3620 traditional_cptr_type_node = (flag_traditional && ! cplus_mode
3621 ? const_string_type_node : const_ptr_type_node);
3623 /* Prototype for memcpy. */
3625 = build_function_type (traditional_ptr_type_node,
3626 tree_cons (NULL_TREE, ptr_type_node,
3627 tree_cons (NULL_TREE, const_ptr_type_node,
3628 sizetype_endlink)));
3630 /* Prototype for memset. */
3632 = build_function_type (traditional_ptr_type_node,
3633 tree_cons (NULL_TREE, ptr_type_node,
3634 tree_cons (NULL_TREE, integer_type_node,
3635 tree_cons (NULL_TREE,
3639 /* Prototype for bzero. */
3641 = build_function_type (void_type_node,
3642 tree_cons (NULL_TREE, traditional_ptr_type_node,
3643 traditional_len_endlink));
3645 /* Prototype for bcmp. */
3647 = build_function_type (integer_type_node,
3648 tree_cons (NULL_TREE, traditional_cptr_type_node,
3649 tree_cons (NULL_TREE,
3650 traditional_cptr_type_node,
3651 traditional_len_endlink)));
3653 builtin_function ("__builtin_constant_p", default_function_type,
3654 BUILT_IN_CONSTANT_P, BUILT_IN_NORMAL, NULL_PTR);
3656 builtin_function ("__builtin_return_address", ptr_ftype_unsigned,
3657 BUILT_IN_RETURN_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
3659 builtin_function ("__builtin_frame_address", ptr_ftype_unsigned,
3660 BUILT_IN_FRAME_ADDRESS, BUILT_IN_NORMAL, NULL_PTR);
3662 builtin_function ("__builtin_alloca", ptr_ftype_sizetype,
3663 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, "alloca");
3664 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS,
3665 BUILT_IN_NORMAL, NULL_PTR);
3666 /* Define alloca, ffs as builtins.
3667 Declare _exit just to mark it as volatile. */
3668 if (! no_builtins && ! no_nonansi_builtins)
3671 temp = builtin_function ("alloca", ptr_ftype_sizetype,
3672 BUILT_IN_ALLOCA, BUILT_IN_NORMAL, NULL_PTR);
3673 /* Suppress error if redefined as a non-function. */
3674 DECL_BUILT_IN_NONANSI (temp) = 1;
3676 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS,
3677 BUILT_IN_NORMAL, NULL_PTR);
3678 /* Suppress error if redefined as a non-function. */
3679 DECL_BUILT_IN_NONANSI (temp) = 1;
3680 temp = builtin_function ("_exit", void_ftype_int,
3681 0, NOT_BUILT_IN, NULL_PTR);
3682 TREE_THIS_VOLATILE (temp) = 1;
3683 TREE_SIDE_EFFECTS (temp) = 1;
3684 /* Suppress error if redefined as a non-function. */
3685 DECL_BUILT_IN_NONANSI (temp) = 1;
3687 /* The system prototypes for these functions have many
3688 variations, so don't specify parameters to avoid conflicts.
3689 The expand_* functions check the argument types anyway. */
3690 temp = builtin_function ("bzero", void_ftype_any,
3691 BUILT_IN_BZERO, BUILT_IN_NORMAL, NULL_PTR);
3692 DECL_BUILT_IN_NONANSI (temp) = 1;
3693 temp = builtin_function ("bcmp", int_ftype_any,
3694 BUILT_IN_BCMP, BUILT_IN_NORMAL, NULL_PTR);
3695 DECL_BUILT_IN_NONANSI (temp) = 1;
3698 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS,
3699 BUILT_IN_NORMAL, NULL_PTR);
3700 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3701 BUILT_IN_NORMAL, NULL_PTR);
3702 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3703 BUILT_IN_NORMAL, NULL_PTR);
3704 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3705 BUILT_IN_NORMAL, NULL_PTR);
3706 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3707 BUILT_IN_NORMAL, NULL_PTR);
3708 builtin_function ("__builtin_saveregs", ptr_ftype, BUILT_IN_SAVEREGS,
3709 BUILT_IN_NORMAL, NULL_PTR);
3710 builtin_function ("__builtin_classify_type", default_function_type,
3711 BUILT_IN_CLASSIFY_TYPE, BUILT_IN_NORMAL, NULL_PTR);
3712 builtin_function ("__builtin_next_arg", ptr_ftype, BUILT_IN_NEXT_ARG,
3713 BUILT_IN_NORMAL, NULL_PTR);
3714 builtin_function ("__builtin_args_info", int_ftype_int, BUILT_IN_ARGS_INFO,
3715 BUILT_IN_NORMAL, NULL_PTR);
3716 builtin_function ("__builtin_setjmp",
3717 build_function_type (integer_type_node,
3718 tree_cons (NULL_TREE, ptr_type_node,
3720 BUILT_IN_SETJMP, BUILT_IN_NORMAL, NULL_PTR);
3721 builtin_function ("__builtin_longjmp",
3722 build_function_type (void_type_node,
3723 tree_cons (NULL_TREE, ptr_type_node,
3724 tree_cons (NULL_TREE,
3727 BUILT_IN_LONGJMP, BUILT_IN_NORMAL, NULL_PTR);
3728 builtin_function ("__builtin_trap", void_ftype, BUILT_IN_TRAP,
3729 BUILT_IN_NORMAL, NULL_PTR);
3731 /* ISO C99 IEEE Unordered compares. */
3732 builtin_function ("__builtin_isgreater", default_function_type,
3733 BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
3734 builtin_function ("__builtin_isgreaterequal", default_function_type,
3735 BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
3736 builtin_function ("__builtin_isless", default_function_type,
3737 BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
3738 builtin_function ("__builtin_islessequal", default_function_type,
3739 BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
3740 builtin_function ("__builtin_islessgreater", default_function_type,
3741 BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
3742 builtin_function ("__builtin_isunordered", default_function_type,
3743 BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
3745 /* Untyped call and return. */
3746 builtin_function ("__builtin_apply_args", ptr_ftype,
3747 BUILT_IN_APPLY_ARGS, BUILT_IN_NORMAL, NULL_PTR);
3749 temp = tree_cons (NULL_TREE,
3750 build_pointer_type (build_function_type (void_type_node,
3752 tree_cons (NULL_TREE,
3754 tree_cons (NULL_TREE,
3757 builtin_function ("__builtin_apply",
3758 build_function_type (ptr_type_node, temp),
3759 BUILT_IN_APPLY, BUILT_IN_NORMAL, NULL_PTR);
3760 builtin_function ("__builtin_return", void_ftype_ptr,
3761 BUILT_IN_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3763 /* Support for varargs.h and stdarg.h. */
3764 builtin_function ("__builtin_varargs_start",
3765 build_function_type (void_type_node,
3766 tree_cons (NULL_TREE,
3767 va_list_ref_type_node,
3769 BUILT_IN_VARARGS_START, BUILT_IN_NORMAL, NULL_PTR);
3771 builtin_function ("__builtin_stdarg_start",
3772 build_function_type (void_type_node,
3773 tree_cons (NULL_TREE,
3774 va_list_ref_type_node,
3776 BUILT_IN_STDARG_START, BUILT_IN_NORMAL, NULL_PTR);
3778 builtin_function ("__builtin_va_end",
3779 build_function_type (void_type_node,
3780 tree_cons (NULL_TREE,
3781 va_list_ref_type_node,
3783 BUILT_IN_VA_END, BUILT_IN_NORMAL, NULL_PTR);
3785 builtin_function ("__builtin_va_copy",
3786 build_function_type (void_type_node,
3787 tree_cons (NULL_TREE,
3788 va_list_ref_type_node,
3789 tree_cons (NULL_TREE,
3790 va_list_arg_type_node,
3792 BUILT_IN_VA_COPY, BUILT_IN_NORMAL, NULL_PTR);
3794 /* ??? Ought to be `T __builtin_expect(T, T)' for any type T. */
3795 builtin_function ("__builtin_expect",
3796 build_function_type (long_integer_type_node,
3797 tree_cons (NULL_TREE,
3798 long_integer_type_node,
3799 tree_cons (NULL_TREE,
3800 long_integer_type_node,
3802 BUILT_IN_EXPECT, BUILT_IN_NORMAL, NULL_PTR);
3804 /* Currently under experimentation. */
3805 builtin_function ("__builtin_memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
3806 BUILT_IN_NORMAL, "memcpy");
3807 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3808 BUILT_IN_MEMCMP, BUILT_IN_NORMAL, "memcmp");
3809 builtin_function ("__builtin_memset", memset_ftype,
3810 BUILT_IN_MEMSET, BUILT_IN_NORMAL, "memset");
3811 builtin_function ("__builtin_bzero", bzero_ftype,
3812 BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
3813 builtin_function ("__builtin_bcmp", bcmp_ftype,
3814 BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");
3815 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3816 BUILT_IN_STRCMP, BUILT_IN_NORMAL, "strcmp");
3817 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3818 BUILT_IN_STRCPY, BUILT_IN_NORMAL, "strcpy");
3819 builtin_function ("__builtin_strlen", strlen_ftype,
3820 BUILT_IN_STRLEN, BUILT_IN_NORMAL, "strlen");
3821 builtin_function ("__builtin_sqrtf", float_ftype_float,
3822 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtf");
3823 builtin_function ("__builtin_fsqrt", double_ftype_double,
3824 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrt");
3825 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3826 BUILT_IN_FSQRT, BUILT_IN_NORMAL, "sqrtl");
3827 builtin_function ("__builtin_sinf", float_ftype_float,
3828 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinf");
3829 builtin_function ("__builtin_sin", double_ftype_double,
3830 BUILT_IN_SIN, BUILT_IN_NORMAL, "sin");
3831 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3832 BUILT_IN_SIN, BUILT_IN_NORMAL, "sinl");
3833 builtin_function ("__builtin_cosf", float_ftype_float,
3834 BUILT_IN_COS, BUILT_IN_NORMAL, "cosf");
3835 builtin_function ("__builtin_cos", double_ftype_double,
3836 BUILT_IN_COS, BUILT_IN_NORMAL, "cos");
3837 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3838 BUILT_IN_COS, BUILT_IN_NORMAL, "cosl");
3842 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS,
3843 BUILT_IN_NORMAL, NULL_PTR);
3844 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS,
3845 BUILT_IN_NORMAL, NULL_PTR);
3846 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS,
3847 BUILT_IN_NORMAL, NULL_PTR);
3848 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3849 BUILT_IN_NORMAL, NULL_PTR);
3850 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS,
3851 BUILT_IN_NORMAL, NULL_PTR);
3852 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY,
3853 BUILT_IN_NORMAL, NULL_PTR);
3854 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3855 BUILT_IN_NORMAL, NULL_PTR);
3856 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET,
3857 BUILT_IN_NORMAL, NULL_PTR);
3858 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3859 BUILT_IN_NORMAL, NULL_PTR);
3860 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3861 BUILT_IN_NORMAL, NULL_PTR);
3862 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN,
3863 BUILT_IN_NORMAL, NULL_PTR);
3864 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT,
3865 BUILT_IN_NORMAL, NULL_PTR);
3866 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT,
3867 BUILT_IN_NORMAL, NULL_PTR);
3868 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3869 BUILT_IN_NORMAL, NULL_PTR);
3870 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN,
3871 BUILT_IN_NORMAL, NULL_PTR);
3872 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN,
3873 BUILT_IN_NORMAL, NULL_PTR);
3874 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN,
3875 BUILT_IN_NORMAL, NULL_PTR);
3876 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS,
3877 BUILT_IN_NORMAL, NULL_PTR);
3878 builtin_function ("cos", double_ftype_double, BUILT_IN_COS,
3879 BUILT_IN_NORMAL, NULL_PTR);
3880 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS,
3881 BUILT_IN_NORMAL, NULL_PTR);
3883 /* Declare these functions volatile
3884 to avoid spurious "control drops through" warnings. */
3885 temp = builtin_function ("abort", cplus_mode ? void_ftype : void_ftype_any,
3886 0, NOT_BUILT_IN, NULL_PTR);
3887 TREE_THIS_VOLATILE (temp) = 1;
3888 TREE_SIDE_EFFECTS (temp) = 1;
3890 #if 0 /* ??? The C++ frontend used to do this. */
3891 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
3893 DECL_BUILT_IN_NONANSI (temp) = 1;
3895 temp = builtin_function ("exit",
3896 cplus_mode ? void_ftype_int : void_ftype_any,
3897 0, NOT_BUILT_IN, NULL_PTR);
3898 TREE_THIS_VOLATILE (temp) = 1;
3899 TREE_SIDE_EFFECTS (temp) = 1;
3901 #if 0 /* ??? The C++ frontend used to do this. */
3902 /* Well, these are actually ANSI, but we can't set DECL_BUILT_IN on
3904 DECL_BUILT_IN_NONANSI (temp) = 1;
3909 /* Support for these has not been written in either expand_builtin
3910 or build_function_call. */
3911 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV,
3912 BUILT_IN_NORMAL, NULL_PTR);
3913 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV,
3914 BUILT_IN_NORMAL, NULL_PTR);
3915 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3916 BUILT_IN_NORMAL, NULL_PTR);
3917 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3918 BUILT_IN_NORMAL, NULL_PTR);
3919 builtin_function ("__builtin_fmod", double_ftype_double_double,
3920 BUILT_IN_FMOD, BUILT_IN_NORMAL, NULL_PTR);
3921 builtin_function ("__builtin_frem", double_ftype_double_double,
3922 BUILT_IN_FREM, BUILT_IN_NORMAL, NULL_PTR);
3923 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3924 BUILT_IN_NORMAL, NULL_PTR);
3925 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3926 BUILT_IN_NORMAL, NULL_PTR);
3929 /* ??? Perhaps there's a better place to do this. But it is related
3930 to __builtin_va_arg, so it isn't that off-the-wall. */
3931 lang_type_promotes_to = simple_type_promotes_to;
3935 build_va_arg (expr, type)
3938 return build1 (VA_ARG_EXPR, type, expr);
3941 /* Given a type, apply default promotions wrt unnamed function arguments
3942 and return the new type. Return NULL_TREE if no change. */
3943 /* ??? There is a function of the same name in the C++ front end that
3944 does something similar, but is more thorough and does not return NULL
3945 if no change. We could perhaps share code, but it would make the
3946 self_promoting_type property harder to identify. */
3949 simple_type_promotes_to (type)
3952 if (TYPE_MAIN_VARIANT (type) == float_type_node)
3953 return double_type_node;
3955 if (C_PROMOTING_INTEGER_TYPE_P (type))
3957 /* Traditionally, unsignedness is preserved in default promotions.
3958 Also preserve unsignedness if not really getting any wider. */
3959 if (TREE_UNSIGNED (type)
3960 && (flag_traditional
3961 || TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)))
3962 return unsigned_type_node;
3963 return integer_type_node;
3969 /* Return 1 if PARMS specifies a fixed number of parameters
3970 and none of their types is affected by default promotions. */
3973 self_promoting_args_p (parms)
3977 for (t = parms; t; t = TREE_CHAIN (t))
3979 register tree type = TREE_VALUE (t);
3981 if (TREE_CHAIN (t) == 0 && type != void_type_node)
3987 if (TYPE_MAIN_VARIANT (type) == float_type_node)
3990 if (C_PROMOTING_INTEGER_TYPE_P (type))
3996 /* Recognize certain built-in functions so we can make tree-codes
3997 other than CALL_EXPR. We do this when it enables fold-const.c
3998 to do something useful. */
3999 /* ??? By rights this should go in builtins.c, but only C and C++
4000 implement build_{binary,unary}_op. Not exactly sure what bits
4001 of functionality are actually needed from those functions, or
4002 where the similar functionality exists in the other front ends. */
4005 expand_tree_builtin (function, params, coerced_params)
4006 tree function, params, coerced_params;
4008 enum tree_code code;
4010 if (DECL_BUILT_IN_CLASS (function) != BUILT_IN_NORMAL)
4013 switch (DECL_FUNCTION_CODE (function))
4018 if (coerced_params == 0)
4019 return integer_zero_node;
4020 return build_unary_op (ABS_EXPR, TREE_VALUE (coerced_params), 0);
4022 case BUILT_IN_ISGREATER:
4023 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4029 case BUILT_IN_ISGREATEREQUAL:
4030 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4036 case BUILT_IN_ISLESS:
4037 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4043 case BUILT_IN_ISLESSEQUAL:
4044 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4050 case BUILT_IN_ISLESSGREATER:
4051 if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
4057 case BUILT_IN_ISUNORDERED:
4058 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
4059 return integer_zero_node;
4060 code = UNORDERED_EXPR;
4068 || TREE_CHAIN (params) == 0)
4070 error ("too few arguments to function `%s'",
4071 IDENTIFIER_POINTER (DECL_NAME (function)));
4072 return error_mark_node;
4074 else if (TREE_CHAIN (TREE_CHAIN (params)) != 0)
4076 error ("too many arguments to function `%s'",
4077 IDENTIFIER_POINTER (DECL_NAME (function)));
4078 return error_mark_node;
4081 arg0 = TREE_VALUE (params);
4082 arg1 = TREE_VALUE (TREE_CHAIN (params));
4083 arg0 = build_binary_op (code, arg0, arg1, 0);
4084 if (code != UNORDERED_EXPR)
4085 arg0 = build_unary_op (TRUTH_NOT_EXPR, arg0, 0);
4097 /* Tree code classes. */
4099 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
4101 static char c_tree_code_type[] = {
4103 #include "c-common.def"
4107 /* Table indexed by tree code giving number of expression
4108 operands beyond the fixed part of the node structure.
4109 Not used for types or decls. */
4111 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
4113 static int c_tree_code_length[] = {
4115 #include "c-common.def"
4119 /* Names of tree components.
4120 Used for printing out the tree and error messages. */
4121 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
4123 static const char *c_tree_code_name[] = {
4125 #include "c-common.def"
4129 /* Adds the tree codes specific to the C front end to the list of all
4135 memcpy (tree_code_type + (int) LAST_AND_UNUSED_TREE_CODE,
4137 (int)LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE);
4138 memcpy (tree_code_length + (int) LAST_AND_UNUSED_TREE_CODE,
4140 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (int));
4141 memcpy (tree_code_name + (int) LAST_AND_UNUSED_TREE_CODE,
4143 (LAST_C_TREE_CODE - (int)LAST_AND_UNUSED_TREE_CODE) * sizeof (char *));