1 /* Mainly the interface between cpplib and the C front ends.
2 Copyright (C) 1987, 1988, 1989, 1992, 1994, 1995, 1996, 1997
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
37 #include "splay-tree.h"
41 /* We may keep statistics about how long which files took to compile. */
42 static int header_time, body_time;
43 static splay_tree file_info_tree;
45 int pending_lang_change; /* If we need to switch languages - C++ only */
46 int c_header_level; /* depth in C headers - C++ only */
48 static tree interpret_integer (const cpp_token *, unsigned int);
49 static tree interpret_float (const cpp_token *, unsigned int);
50 static tree interpret_fixed (const cpp_token *, unsigned int);
51 static enum integer_type_kind narrowest_unsigned_type
52 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
53 static enum integer_type_kind narrowest_signed_type
54 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
55 static enum cpp_ttype lex_string (const cpp_token *, tree *, bool, bool);
56 static tree lex_charconst (const cpp_token *);
57 static void update_header_times (const char *);
58 static int dump_one_header (splay_tree_node, void *);
59 static void cb_line_change (cpp_reader *, const cpp_token *, int);
60 static void cb_ident (cpp_reader *, unsigned int, const cpp_string *);
61 static void cb_def_pragma (cpp_reader *, unsigned int);
62 static void cb_define (cpp_reader *, unsigned int, cpp_hashnode *);
63 static void cb_undef (cpp_reader *, unsigned int, cpp_hashnode *);
68 struct cpp_callbacks *cb;
69 struct c_fileinfo *toplevel;
71 /* The get_fileinfo data structure must be initialized before
72 cpp_read_main_file is called. */
73 toplevel = get_fileinfo ("<top level>");
74 if (flag_detailed_statistics)
77 body_time = get_run_time ();
78 toplevel->time = body_time;
81 cb = cpp_get_callbacks (parse_in);
83 cb->line_change = cb_line_change;
85 cb->def_pragma = cb_def_pragma;
86 cb->valid_pch = c_common_valid_pch;
87 cb->read_pch = c_common_read_pch;
89 /* Set the debug callbacks if we can use them. */
90 if (debug_info_level == DINFO_LEVEL_VERBOSE
91 && (write_symbols == DWARF2_DEBUG
92 || write_symbols == VMS_AND_DWARF2_DEBUG))
94 cb->define = cb_define;
100 get_fileinfo (const char *name)
103 struct c_fileinfo *fi;
106 file_info_tree = splay_tree_new ((splay_tree_compare_fn) strcmp,
108 (splay_tree_delete_value_fn) free);
110 n = splay_tree_lookup (file_info_tree, (splay_tree_key) name);
112 return (struct c_fileinfo *) n->value;
114 fi = XNEW (struct c_fileinfo);
116 fi->interface_only = 0;
117 fi->interface_unknown = 1;
118 splay_tree_insert (file_info_tree, (splay_tree_key) name,
119 (splay_tree_value) fi);
124 update_header_times (const char *name)
126 /* Changing files again. This means currently collected time
127 is charged against header time, and body time starts back at 0. */
128 if (flag_detailed_statistics)
130 int this_time = get_run_time ();
131 struct c_fileinfo *file = get_fileinfo (name);
132 header_time += this_time - body_time;
133 file->time += this_time - body_time;
134 body_time = this_time;
139 dump_one_header (splay_tree_node n, void * ARG_UNUSED (dummy))
141 print_time ((const char *) n->key,
142 ((struct c_fileinfo *) n->value)->time);
147 dump_time_statistics (void)
149 struct c_fileinfo *file = get_fileinfo (input_filename);
150 int this_time = get_run_time ();
151 file->time += this_time - body_time;
153 fprintf (stderr, "\n******\n");
154 print_time ("header files (total)", header_time);
155 print_time ("main file (total)", this_time - body_time);
156 fprintf (stderr, "ratio = %g : 1\n",
157 (double) header_time / (double) (this_time - body_time));
158 fprintf (stderr, "\n******\n");
160 splay_tree_foreach (file_info_tree, dump_one_header, 0);
164 cb_ident (cpp_reader * ARG_UNUSED (pfile),
165 unsigned int ARG_UNUSED (line),
166 const cpp_string * ARG_UNUSED (str))
168 #ifdef ASM_OUTPUT_IDENT
171 /* Convert escapes in the string. */
172 cpp_string cstr = { 0, 0 };
173 if (cpp_interpret_string (pfile, str, 1, &cstr, CPP_STRING))
175 ASM_OUTPUT_IDENT (asm_out_file, (const char *) cstr.text);
176 free (CONST_CAST (unsigned char *, cstr.text));
182 /* Called at the start of every non-empty line. TOKEN is the first
183 lexed token on the line. Used for diagnostic line numbers. */
185 cb_line_change (cpp_reader * ARG_UNUSED (pfile), const cpp_token *token,
188 if (token->type != CPP_EOF && !parsing_args)
189 input_location = token->src_loc;
193 fe_file_change (const struct line_map *new_map)
198 if (new_map->reason == LC_ENTER)
200 /* Don't stack the main buffer on the input stack;
201 we already did in compile_file. */
202 if (!MAIN_FILE_P (new_map))
204 unsigned int included_at = LAST_SOURCE_LINE_LOCATION (new_map - 1);
206 if (included_at > BUILTINS_LOCATION)
207 line = SOURCE_LINE (new_map - 1, included_at);
209 input_location = new_map->start_location;
210 (*debug_hooks->start_source_file) (line, new_map->to_file);
211 #ifndef NO_IMPLICIT_EXTERN_C
214 else if (new_map->sysp == 2)
217 ++pending_lang_change;
222 else if (new_map->reason == LC_LEAVE)
224 #ifndef NO_IMPLICIT_EXTERN_C
225 if (c_header_level && --c_header_level == 0)
227 if (new_map->sysp == 2)
228 warning (0, "badly nested C headers from preprocessor");
229 --pending_lang_change;
232 input_location = new_map->start_location;
234 (*debug_hooks->end_source_file) (new_map->to_line);
237 update_header_times (new_map->to_file);
238 input_location = new_map->start_location;
242 cb_def_pragma (cpp_reader *pfile, source_location loc)
244 /* Issue a warning message if we have been asked to do so. Ignore
245 unknown pragmas in system headers unless an explicit
246 -Wunknown-pragmas has been given. */
247 if (warn_unknown_pragmas > in_system_header)
249 const unsigned char *space, *name;
251 location_t fe_loc = loc;
253 space = name = (const unsigned char *) "";
254 s = cpp_get_token (pfile);
255 if (s->type != CPP_EOF)
257 space = cpp_token_as_text (pfile, s);
258 s = cpp_get_token (pfile);
259 if (s->type == CPP_NAME)
260 name = cpp_token_as_text (pfile, s);
263 warning_at (fe_loc, OPT_Wunknown_pragmas, "ignoring #pragma %s %s",
268 /* #define callback for DWARF and DWARF2 debug info. */
270 cb_define (cpp_reader *pfile, source_location loc, cpp_hashnode *node)
272 const struct line_map *map = linemap_lookup (line_table, loc);
273 (*debug_hooks->define) (SOURCE_LINE (map, loc),
274 (const char *) cpp_macro_definition (pfile, node));
277 /* #undef callback for DWARF and DWARF2 debug info. */
279 cb_undef (cpp_reader * ARG_UNUSED (pfile), source_location loc,
282 const struct line_map *map = linemap_lookup (line_table, loc);
283 (*debug_hooks->undef) (SOURCE_LINE (map, loc),
284 (const char *) NODE_NAME (node));
287 /* Read a token and return its type. Fill *VALUE with its value, if
288 applicable. Fill *CPP_FLAGS with the token's flags, if it is
292 c_lex_with_flags (tree *value, location_t *loc, unsigned char *cpp_flags,
295 static bool no_more_pch;
296 const cpp_token *tok;
298 unsigned char add_flags = 0;
300 timevar_push (TV_CPP);
302 tok = cpp_get_token_with_location (parse_in, loc);
312 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node.node));
317 unsigned int flags = cpp_classify_number (parse_in, tok);
319 switch (flags & CPP_N_CATEGORY)
322 /* cpplib has issued an error. */
323 *value = error_mark_node;
327 /* C++ uses '0' to mark virtual functions as pure.
328 Set PURE_ZERO to pass this information to the C++ parser. */
329 if (tok->val.str.len == 1 && *tok->val.str.text == '0')
330 add_flags = PURE_ZERO;
331 *value = interpret_integer (tok, flags);
335 *value = interpret_float (tok, flags);
345 /* An @ may give the next token special significance in Objective-C. */
346 if (c_dialect_objc ())
348 location_t atloc = *loc;
352 tok = cpp_get_token_with_location (parse_in, &newloc);
364 type = lex_string (tok, value, true, true);
368 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node.node));
369 if (objc_is_reserved_word (*value))
378 error_at (atloc, "stray %<@%> in program");
389 unsigned char name[8];
391 *cpp_spell_token (parse_in, tok, name, true) = 0;
393 error ("stray %qs in program", name);
400 cppchar_t c = tok->val.str.text[0];
402 if (c == '"' || c == '\'')
403 error ("missing terminating %c character", (int) c);
404 else if (ISGRAPH (c))
405 error ("stray %qc in program", (int) c);
407 error ("stray %<\\%o%> in program", (int) c);
415 *value = lex_charconst (tok);
423 if ((lex_flags & C_LEX_STRING_NO_JOIN) == 0)
425 type = lex_string (tok, value, false,
426 (lex_flags & C_LEX_STRING_NO_TRANSLATE) == 0);
429 *value = build_string (tok->val.str.len, (const char *) tok->val.str.text);
433 *value = build_int_cst (NULL, tok->val.pragma);
436 /* These tokens should not be visible outside cpplib. */
437 case CPP_HEADER_NAME:
441 /* CPP_COMMENT will appear when compiling with -C and should be
452 *cpp_flags = tok->flags | add_flags;
457 c_common_no_more_pch ();
460 timevar_pop (TV_CPP);
465 /* Returns the narrowest C-visible unsigned type, starting with the
466 minimum specified by FLAGS, that can fit HIGH:LOW, or itk_none if
469 static enum integer_type_kind
470 narrowest_unsigned_type (unsigned HOST_WIDE_INT low,
471 unsigned HOST_WIDE_INT high,
476 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
477 itk = itk_unsigned_int;
478 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
479 itk = itk_unsigned_long;
481 itk = itk_unsigned_long_long;
483 for (; itk < itk_none; itk += 2 /* skip unsigned types */)
487 if (integer_types[itk] == NULL_TREE)
489 upper = TYPE_MAX_VALUE (integer_types[itk]);
491 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
492 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
493 && TREE_INT_CST_LOW (upper) >= low))
494 return (enum integer_type_kind) itk;
500 /* Ditto, but narrowest signed type. */
501 static enum integer_type_kind
502 narrowest_signed_type (unsigned HOST_WIDE_INT low,
503 unsigned HOST_WIDE_INT high, unsigned int flags)
507 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
509 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
515 for (; itk < itk_none; itk += 2 /* skip signed types */)
519 if (integer_types[itk] == NULL_TREE)
521 upper = TYPE_MAX_VALUE (integer_types[itk]);
523 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
524 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
525 && TREE_INT_CST_LOW (upper) >= low))
526 return (enum integer_type_kind) itk;
532 /* Interpret TOKEN, an integer with FLAGS as classified by cpplib. */
534 interpret_integer (const cpp_token *token, unsigned int flags)
537 enum integer_type_kind itk;
539 cpp_options *options = cpp_get_options (parse_in);
541 integer = cpp_interpret_integer (parse_in, token, flags);
542 integer = cpp_num_sign_extend (integer, options->precision);
544 /* The type of a constant with a U suffix is straightforward. */
545 if (flags & CPP_N_UNSIGNED)
546 itk = narrowest_unsigned_type (integer.low, integer.high, flags);
549 /* The type of a potentially-signed integer constant varies
550 depending on the base it's in, the standard in use, and the
552 enum integer_type_kind itk_u
553 = narrowest_unsigned_type (integer.low, integer.high, flags);
554 enum integer_type_kind itk_s
555 = narrowest_signed_type (integer.low, integer.high, flags);
557 /* In both C89 and C99, octal and hex constants may be signed or
558 unsigned, whichever fits tighter. We do not warn about this
559 choice differing from the traditional choice, as the constant
560 is probably a bit pattern and either way will work. */
561 if ((flags & CPP_N_RADIX) != CPP_N_DECIMAL)
562 itk = MIN (itk_u, itk_s);
565 /* In C99, decimal constants are always signed.
566 In C89, decimal constants that don't fit in long have
567 undefined behavior; we try to make them unsigned long.
568 In GCC's extended C89, that last is true of decimal
569 constants that don't fit in long long, too. */
572 if (itk_s > itk_u && itk_s > itk_long)
576 if (itk_u < itk_unsigned_long)
577 itk_u = itk_unsigned_long;
579 warning (0, "this decimal constant is unsigned only in ISO C90");
582 warning (OPT_Wtraditional,
583 "this decimal constant would be unsigned in ISO C90");
589 /* cpplib has already issued a warning for overflow. */
590 type = ((flags & CPP_N_UNSIGNED)
591 ? widest_unsigned_literal_type_node
592 : widest_integer_literal_type_node);
595 type = integer_types[itk];
596 if (itk > itk_unsigned_long
597 && (flags & CPP_N_WIDTH) != CPP_N_LARGE)
599 ((c_dialect_cxx () ? cxx_dialect == cxx98 : !flag_isoc99)
600 ? DK_PEDWARN : DK_WARNING,
601 input_location, OPT_Wlong_long,
602 (flags & CPP_N_UNSIGNED)
603 ? "integer constant is too large for %<unsigned long%> type"
604 : "integer constant is too large for %<long%> type");
607 value = build_int_cst_wide (type, integer.low, integer.high);
609 /* Convert imaginary to a complex type. */
610 if (flags & CPP_N_IMAGINARY)
611 value = build_complex (NULL_TREE, build_int_cst (type, 0), value);
616 /* Interpret TOKEN, a floating point number with FLAGS as classified
619 interpret_float (const cpp_token *token, unsigned int flags)
624 REAL_VALUE_TYPE real;
625 REAL_VALUE_TYPE real_trunc;
629 /* Default (no suffix) depends on whether the FLOAT_CONST_DECIMAL64
630 pragma has been used and is either double or _Decimal64. Types
631 that are not allowed with decimal float default to double. */
632 if (flags & CPP_N_DEFAULT)
634 flags ^= CPP_N_DEFAULT;
635 flags |= CPP_N_MEDIUM;
637 if (((flags & CPP_N_HEX) == 0) && ((flags & CPP_N_IMAGINARY) == 0))
639 warning (OPT_Wunsuffixed_float_constants,
640 "unsuffixed float constant");
641 if (float_const_decimal64_p ())
642 flags |= CPP_N_DFLOAT;
646 /* Decode _Fract and _Accum. */
647 if (flags & CPP_N_FRACT || flags & CPP_N_ACCUM)
648 return interpret_fixed (token, flags);
650 /* Decode type based on width and properties. */
651 if (flags & CPP_N_DFLOAT)
652 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
653 type = dfloat128_type_node;
654 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
655 type = dfloat32_type_node;
657 type = dfloat64_type_node;
659 if (flags & CPP_N_WIDTH_MD)
662 enum machine_mode mode;
664 if ((flags & CPP_N_WIDTH_MD) == CPP_N_MD_W)
669 mode = targetm.c.mode_for_suffix (suffix);
670 if (mode == VOIDmode)
672 error ("unsupported non-standard suffix on floating constant");
674 return error_mark_node;
677 pedwarn (input_location, OPT_pedantic, "non-standard suffix on floating constant");
679 type = c_common_type_for_mode (mode, 0);
682 else if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
683 type = long_double_type_node;
684 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL
685 || flag_single_precision_constant)
686 type = float_type_node;
688 type = double_type_node;
690 const_type = excess_precision_type (type);
694 /* Copy the constant to a nul-terminated buffer. If the constant
695 has any suffixes, cut them off; REAL_VALUE_ATOF/ REAL_VALUE_HTOF
696 can't handle them. */
697 copylen = token->val.str.len;
698 if (flags & CPP_N_DFLOAT)
702 if ((flags & CPP_N_WIDTH) != CPP_N_MEDIUM)
703 /* Must be an F or L or machine defined suffix. */
705 if (flags & CPP_N_IMAGINARY)
710 copy = (char *) alloca (copylen + 1);
711 memcpy (copy, token->val.str.text, copylen);
712 copy[copylen] = '\0';
714 real_from_string3 (&real, copy, TYPE_MODE (const_type));
715 if (const_type != type)
716 /* Diagnosing if the result of converting the value with excess
717 precision to the semantic type would overflow (with associated
718 double rounding) is more appropriate than diagnosing if the
719 result of converting the string directly to the semantic type
721 real_convert (&real_trunc, TYPE_MODE (type), &real);
723 /* Both C and C++ require a diagnostic for a floating constant
724 outside the range of representable values of its type. Since we
725 have __builtin_inf* to produce an infinity, this is now a
726 mandatory pedwarn if the target does not support infinities. */
727 if (REAL_VALUE_ISINF (real)
728 || (const_type != type && REAL_VALUE_ISINF (real_trunc)))
730 if (!MODE_HAS_INFINITIES (TYPE_MODE (type)))
731 pedwarn (input_location, 0, "floating constant exceeds range of %qT", type);
733 warning (OPT_Woverflow, "floating constant exceeds range of %qT", type);
735 /* We also give a warning if the value underflows. */
736 else if (REAL_VALUES_EQUAL (real, dconst0)
737 || (const_type != type && REAL_VALUES_EQUAL (real_trunc, dconst0)))
739 REAL_VALUE_TYPE realvoidmode;
740 int overflow = real_from_string (&realvoidmode, copy);
741 if (overflow < 0 || !REAL_VALUES_EQUAL (realvoidmode, dconst0))
742 warning (OPT_Woverflow, "floating constant truncated to zero");
745 /* Create a node with determined type and value. */
746 value = build_real (const_type, real);
747 if (flags & CPP_N_IMAGINARY)
748 value = build_complex (NULL_TREE, convert (const_type, integer_zero_node),
751 if (type != const_type)
752 value = build1 (EXCESS_PRECISION_EXPR, type, value);
757 /* Interpret TOKEN, a fixed-point number with FLAGS as classified
761 interpret_fixed (const cpp_token *token, unsigned int flags)
765 FIXED_VALUE_TYPE fixed;
769 copylen = token->val.str.len;
771 if (flags & CPP_N_FRACT) /* _Fract. */
773 if (flags & CPP_N_UNSIGNED) /* Unsigned _Fract. */
775 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
777 type = unsigned_long_long_fract_type_node;
780 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
782 type = unsigned_long_fract_type_node;
785 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
787 type = unsigned_short_fract_type_node;
792 type = unsigned_fract_type_node;
796 else /* Signed _Fract. */
798 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
800 type = long_long_fract_type_node;
803 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
805 type = long_fract_type_node;
808 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
810 type = short_fract_type_node;
815 type = fract_type_node;
822 if (flags & CPP_N_UNSIGNED) /* Unsigned _Accum. */
824 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
826 type = unsigned_long_long_accum_type_node;
829 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
831 type = unsigned_long_accum_type_node;
834 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
836 type = unsigned_short_accum_type_node;
841 type = unsigned_accum_type_node;
845 else /* Signed _Accum. */
847 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
849 type = long_long_accum_type_node;
852 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
854 type = long_accum_type_node;
857 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
859 type = short_accum_type_node;
864 type = accum_type_node;
870 copy = (char *) alloca (copylen + 1);
871 memcpy (copy, token->val.str.text, copylen);
872 copy[copylen] = '\0';
874 fixed_from_string (&fixed, copy, TYPE_MODE (type));
876 /* Create a node with determined type and value. */
877 value = build_fixed (type, fixed);
882 /* Convert a series of STRING, WSTRING, STRING16, STRING32 and/or
883 UTF8STRING tokens into a tree, performing string constant
884 concatenation. TOK is the first of these. VALP is the location
885 to write the string into. OBJC_STRING indicates whether an '@' token
886 preceded the incoming token.
887 Returns the CPP token type of the result (CPP_STRING, CPP_WSTRING,
888 CPP_STRING32, CPP_STRING16, CPP_UTF8STRING, or CPP_OBJC_STRING).
890 This is unfortunately more work than it should be. If any of the
891 strings in the series has an L prefix, the result is a wide string
892 (6.4.5p4). Whether or not the result is a wide string affects the
893 meaning of octal and hexadecimal escapes (6.4.4.4p6,9). But escape
894 sequences do not continue across the boundary between two strings in
895 a series (6.4.5p7), so we must not lose the boundaries. Therefore
896 cpp_interpret_string takes a vector of cpp_string structures, which
897 we must arrange to provide. */
899 static enum cpp_ttype
900 lex_string (const cpp_token *tok, tree *valp, bool objc_string, bool translate)
904 struct obstack str_ob;
906 enum cpp_ttype type = tok->type;
908 /* Try to avoid the overhead of creating and destroying an obstack
909 for the common case of just one string. */
910 cpp_string str = tok->val.str;
911 cpp_string *strs = &str;
914 tok = cpp_get_token (parse_in);
920 if (c_dialect_objc ())
934 if (type != tok->type)
936 if (type == CPP_STRING)
939 error ("unsupported non-standard concatenation of string literals");
945 gcc_obstack_init (&str_ob);
946 obstack_grow (&str_ob, &str, sizeof (cpp_string));
950 obstack_grow (&str_ob, &tok->val.str, sizeof (cpp_string));
954 /* We have read one more token than we want. */
955 _cpp_backup_tokens (parse_in, 1);
957 strs = XOBFINISH (&str_ob, cpp_string *);
959 if (concats && !objc_string && !in_system_header)
960 warning (OPT_Wtraditional,
961 "traditional C rejects string constant concatenation");
964 ? cpp_interpret_string : cpp_interpret_string_notranslate)
965 (parse_in, strs, concats + 1, &istr, type))
967 value = build_string (istr.len, (const char *) istr.text);
968 free (CONST_CAST (unsigned char *, istr.text));
972 /* Callers cannot generally handle error_mark_node in this context,
973 so return the empty string instead. cpp_interpret_string has
980 value = build_string (1, "");
983 value = build_string (TYPE_PRECISION (char16_type_node)
984 / TYPE_PRECISION (char_type_node),
985 "\0"); /* char16_t is 16 bits */
988 value = build_string (TYPE_PRECISION (char32_type_node)
989 / TYPE_PRECISION (char_type_node),
990 "\0\0\0"); /* char32_t is 32 bits */
993 value = build_string (TYPE_PRECISION (wchar_type_node)
994 / TYPE_PRECISION (char_type_node),
995 "\0\0\0"); /* widest supported wchar_t
1005 case CPP_UTF8STRING:
1006 TREE_TYPE (value) = char_array_type_node;
1009 TREE_TYPE (value) = char16_array_type_node;
1012 TREE_TYPE (value) = char32_array_type_node;
1015 TREE_TYPE (value) = wchar_array_type_node;
1017 *valp = fix_string_type (value);
1020 obstack_free (&str_ob, 0);
1022 return objc_string ? CPP_OBJC_STRING : type;
1025 /* Converts a (possibly wide) character constant token into a tree. */
1027 lex_charconst (const cpp_token *token)
1031 unsigned int chars_seen;
1034 result = cpp_interpret_charconst (parse_in, token,
1035 &chars_seen, &unsignedp);
1037 if (token->type == CPP_WCHAR)
1038 type = wchar_type_node;
1039 else if (token->type == CPP_CHAR32)
1040 type = char32_type_node;
1041 else if (token->type == CPP_CHAR16)
1042 type = char16_type_node;
1043 /* In C, a character constant has type 'int'.
1044 In C++ 'char', but multi-char charconsts have type 'int'. */
1045 else if (!c_dialect_cxx () || chars_seen > 1)
1046 type = integer_type_node;
1048 type = char_type_node;
1050 /* Cast to cppchar_signed_t to get correct sign-extension of RESULT
1051 before possibly widening to HOST_WIDE_INT for build_int_cst. */
1052 if (unsignedp || (cppchar_signed_t) result >= 0)
1053 value = build_int_cst_wide (type, result, 0);
1055 value = build_int_cst_wide (type, (cppchar_signed_t) result, -1);