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
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"
41 #include "splay-tree.h"
45 /* We may keep statistics about how long which files took to compile. */
46 static int header_time, body_time;
47 static splay_tree file_info_tree;
49 int pending_lang_change; /* If we need to switch languages - C++ only */
50 int c_header_level; /* depth in C headers - C++ only */
52 /* If we need to translate characters received. This is tri-state:
53 0 means use only the untranslated string; 1 means use only
54 the translated string; -1 means chain the translated string
55 to the untranslated one. */
56 int c_lex_string_translate = 1;
58 /* True if strings should be passed to the caller of c_lex completely
59 unmolested (no concatenation, no translation). */
60 bool c_lex_return_raw_strings = false;
62 static tree interpret_integer (const cpp_token *, unsigned int);
63 static tree interpret_float (const cpp_token *, unsigned int);
64 static tree interpret_fixed (const cpp_token *, unsigned int);
65 static enum integer_type_kind narrowest_unsigned_type
66 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
67 static enum integer_type_kind narrowest_signed_type
68 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
69 static enum cpp_ttype lex_string (const cpp_token *, tree *, bool);
70 static tree lex_charconst (const cpp_token *);
71 static void update_header_times (const char *);
72 static int dump_one_header (splay_tree_node, void *);
73 static void cb_line_change (cpp_reader *, const cpp_token *, int);
74 static void cb_ident (cpp_reader *, unsigned int, const cpp_string *);
75 static void cb_def_pragma (cpp_reader *, unsigned int);
76 static void cb_define (cpp_reader *, unsigned int, cpp_hashnode *);
77 static void cb_undef (cpp_reader *, unsigned int, cpp_hashnode *);
82 struct cpp_callbacks *cb;
83 struct c_fileinfo *toplevel;
85 /* The get_fileinfo data structure must be initialized before
86 cpp_read_main_file is called. */
87 toplevel = get_fileinfo ("<top level>");
88 if (flag_detailed_statistics)
91 body_time = get_run_time ();
92 toplevel->time = body_time;
95 cb = cpp_get_callbacks (parse_in);
97 cb->line_change = cb_line_change;
99 cb->def_pragma = cb_def_pragma;
100 cb->valid_pch = c_common_valid_pch;
101 cb->read_pch = c_common_read_pch;
103 /* Set the debug callbacks if we can use them. */
104 if (debug_info_level == DINFO_LEVEL_VERBOSE
105 && (write_symbols == DWARF2_DEBUG
106 || write_symbols == VMS_AND_DWARF2_DEBUG))
108 cb->define = cb_define;
109 cb->undef = cb_undef;
114 get_fileinfo (const char *name)
117 struct c_fileinfo *fi;
120 file_info_tree = splay_tree_new ((splay_tree_compare_fn) strcmp,
122 (splay_tree_delete_value_fn) free);
124 n = splay_tree_lookup (file_info_tree, (splay_tree_key) name);
126 return (struct c_fileinfo *) n->value;
128 fi = XNEW (struct c_fileinfo);
130 fi->interface_only = 0;
131 fi->interface_unknown = 1;
132 splay_tree_insert (file_info_tree, (splay_tree_key) name,
133 (splay_tree_value) fi);
138 update_header_times (const char *name)
140 /* Changing files again. This means currently collected time
141 is charged against header time, and body time starts back at 0. */
142 if (flag_detailed_statistics)
144 int this_time = get_run_time ();
145 struct c_fileinfo *file = get_fileinfo (name);
146 header_time += this_time - body_time;
147 file->time += this_time - body_time;
148 body_time = this_time;
153 dump_one_header (splay_tree_node n, void * ARG_UNUSED (dummy))
155 print_time ((const char *) n->key,
156 ((struct c_fileinfo *) n->value)->time);
161 dump_time_statistics (void)
163 struct c_fileinfo *file = get_fileinfo (input_filename);
164 int this_time = get_run_time ();
165 file->time += this_time - body_time;
167 fprintf (stderr, "\n******\n");
168 print_time ("header files (total)", header_time);
169 print_time ("main file (total)", this_time - body_time);
170 fprintf (stderr, "ratio = %g : 1\n",
171 (double) header_time / (double) (this_time - body_time));
172 fprintf (stderr, "\n******\n");
174 splay_tree_foreach (file_info_tree, dump_one_header, 0);
178 cb_ident (cpp_reader * ARG_UNUSED (pfile),
179 unsigned int ARG_UNUSED (line),
180 const cpp_string * ARG_UNUSED (str))
182 #ifdef ASM_OUTPUT_IDENT
185 /* Convert escapes in the string. */
186 cpp_string cstr = { 0, 0 };
187 if (cpp_interpret_string (pfile, str, 1, &cstr, false))
189 ASM_OUTPUT_IDENT (asm_out_file, (const char *) cstr.text);
190 free (CONST_CAST (unsigned char *, cstr.text));
196 /* Called at the start of every non-empty line. TOKEN is the first
197 lexed token on the line. Used for diagnostic line numbers. */
199 cb_line_change (cpp_reader * ARG_UNUSED (pfile), const cpp_token *token,
202 if (token->type != CPP_EOF && !parsing_args)
203 #ifdef USE_MAPPED_LOCATION
204 input_location = token->src_loc;
207 source_location loc = token->src_loc;
208 const struct line_map *map = linemap_lookup (line_table, loc);
209 input_line = SOURCE_LINE (map, loc);
215 fe_file_change (const struct line_map *new_map)
220 if (new_map->reason == LC_ENTER)
222 /* Don't stack the main buffer on the input stack;
223 we already did in compile_file. */
224 if (!MAIN_FILE_P (new_map))
226 #ifdef USE_MAPPED_LOCATION
227 int included_at = LAST_SOURCE_LINE_LOCATION (new_map - 1);
229 input_location = included_at;
230 push_srcloc (new_map->start_location);
232 int included_at = LAST_SOURCE_LINE (new_map - 1);
234 input_line = included_at;
235 push_srcloc (new_map->to_file, 1);
237 (*debug_hooks->start_source_file) (included_at, new_map->to_file);
238 #ifndef NO_IMPLICIT_EXTERN_C
241 else if (new_map->sysp == 2)
244 ++pending_lang_change;
249 else if (new_map->reason == LC_LEAVE)
251 #ifndef NO_IMPLICIT_EXTERN_C
252 if (c_header_level && --c_header_level == 0)
254 if (new_map->sysp == 2)
255 warning (0, "badly nested C headers from preprocessor");
256 --pending_lang_change;
261 (*debug_hooks->end_source_file) (new_map->to_line);
264 update_header_times (new_map->to_file);
265 in_system_header = new_map->sysp != 0;
266 #ifdef USE_MAPPED_LOCATION
267 input_location = new_map->start_location;
269 input_filename = new_map->to_file;
270 input_line = new_map->to_line;
275 cb_def_pragma (cpp_reader *pfile, source_location loc)
277 /* Issue a warning message if we have been asked to do so. Ignore
278 unknown pragmas in system headers unless an explicit
279 -Wunknown-pragmas has been given. */
280 if (warn_unknown_pragmas > in_system_header)
282 const unsigned char *space, *name;
284 #ifndef USE_MAPPED_LOCATION
286 const struct line_map *map = linemap_lookup (line_table, loc);
287 fe_loc.file = map->to_file;
288 fe_loc.line = SOURCE_LINE (map, loc);
290 location_t fe_loc = loc;
293 space = name = (const unsigned char *) "";
294 s = cpp_get_token (pfile);
295 if (s->type != CPP_EOF)
297 space = cpp_token_as_text (pfile, s);
298 s = cpp_get_token (pfile);
299 if (s->type == CPP_NAME)
300 name = cpp_token_as_text (pfile, s);
303 warning (OPT_Wunknown_pragmas, "%Hignoring #pragma %s %s",
304 &fe_loc, space, name);
308 /* #define callback for DWARF and DWARF2 debug info. */
310 cb_define (cpp_reader *pfile, source_location loc, cpp_hashnode *node)
312 const struct line_map *map = linemap_lookup (line_table, loc);
313 (*debug_hooks->define) (SOURCE_LINE (map, loc),
314 (const char *) cpp_macro_definition (pfile, node));
317 /* #undef callback for DWARF and DWARF2 debug info. */
319 cb_undef (cpp_reader * ARG_UNUSED (pfile), source_location loc,
322 const struct line_map *map = linemap_lookup (line_table, loc);
323 (*debug_hooks->undef) (SOURCE_LINE (map, loc),
324 (const char *) NODE_NAME (node));
327 /* Read a token and return its type. Fill *VALUE with its value, if
328 applicable. Fill *CPP_FLAGS with the token's flags, if it is
332 c_lex_with_flags (tree *value, location_t *loc, unsigned char *cpp_flags)
334 static bool no_more_pch;
335 const cpp_token *tok;
337 unsigned char add_flags = 0;
339 timevar_push (TV_CPP);
341 #ifdef USE_MAPPED_LOCATION
342 tok = cpp_get_token_with_location (parse_in, loc);
344 tok = cpp_get_token (parse_in);
345 *loc = input_location;
356 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
361 unsigned int flags = cpp_classify_number (parse_in, tok);
363 switch (flags & CPP_N_CATEGORY)
366 /* cpplib has issued an error. */
367 *value = error_mark_node;
372 /* C++ uses '0' to mark virtual functions as pure.
373 Set PURE_ZERO to pass this information to the C++ parser. */
374 if (tok->val.str.len == 1 && *tok->val.str.text == '0')
375 add_flags = PURE_ZERO;
376 *value = interpret_integer (tok, flags);
380 *value = interpret_float (tok, flags);
390 /* An @ may give the next token special significance in Objective-C. */
391 if (c_dialect_objc ())
393 #ifdef USE_MAPPED_LOCATION
394 location_t atloc = *loc;
397 location_t atloc = input_location;
401 #ifdef USE_MAPPED_LOCATION
402 tok = cpp_get_token_with_location (parse_in, &newloc);
404 tok = cpp_get_token (parse_in);
414 type = lex_string (tok, value, true);
418 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
419 if (objc_is_reserved_word (*value))
428 error ("%Hstray %<@%> in program", &atloc);
429 #ifdef USE_MAPPED_LOCATION
441 unsigned char name[4];
443 *cpp_spell_token (parse_in, tok, name, true) = 0;
445 error ("stray %qs in program", name);
452 cppchar_t c = tok->val.str.text[0];
454 if (c == '"' || c == '\'')
455 error ("missing terminating %c character", (int) c);
456 else if (ISGRAPH (c))
457 error ("stray %qc in program", (int) c);
459 error ("stray %<\\%o%> in program", (int) c);
465 *value = lex_charconst (tok);
470 if (!c_lex_return_raw_strings)
472 type = lex_string (tok, value, false);
475 *value = build_string (tok->val.str.len, (const char *) tok->val.str.text);
479 *value = build_int_cst (NULL, tok->val.pragma);
482 /* These tokens should not be visible outside cpplib. */
483 case CPP_HEADER_NAME:
494 *cpp_flags = tok->flags | add_flags;
499 c_common_no_more_pch ();
502 timevar_pop (TV_CPP);
507 /* Returns the narrowest C-visible unsigned type, starting with the
508 minimum specified by FLAGS, that can fit HIGH:LOW, or itk_none if
511 static enum integer_type_kind
512 narrowest_unsigned_type (unsigned HOST_WIDE_INT low,
513 unsigned HOST_WIDE_INT high,
516 enum integer_type_kind itk;
518 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
519 itk = itk_unsigned_int;
520 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
521 itk = itk_unsigned_long;
523 itk = itk_unsigned_long_long;
525 for (; itk < itk_none; itk += 2 /* skip unsigned types */)
527 tree upper = TYPE_MAX_VALUE (integer_types[itk]);
529 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
530 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
531 && TREE_INT_CST_LOW (upper) >= low))
538 /* Ditto, but narrowest signed type. */
539 static enum integer_type_kind
540 narrowest_signed_type (unsigned HOST_WIDE_INT low,
541 unsigned HOST_WIDE_INT high, unsigned int flags)
543 enum integer_type_kind itk;
545 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
547 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
553 for (; itk < itk_none; itk += 2 /* skip signed types */)
555 tree upper = TYPE_MAX_VALUE (integer_types[itk]);
557 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
558 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
559 && TREE_INT_CST_LOW (upper) >= low))
566 /* Interpret TOKEN, an integer with FLAGS as classified by cpplib. */
568 interpret_integer (const cpp_token *token, unsigned int flags)
571 enum integer_type_kind itk;
573 cpp_options *options = cpp_get_options (parse_in);
575 integer = cpp_interpret_integer (parse_in, token, flags);
576 integer = cpp_num_sign_extend (integer, options->precision);
578 /* The type of a constant with a U suffix is straightforward. */
579 if (flags & CPP_N_UNSIGNED)
580 itk = narrowest_unsigned_type (integer.low, integer.high, flags);
583 /* The type of a potentially-signed integer constant varies
584 depending on the base it's in, the standard in use, and the
586 enum integer_type_kind itk_u
587 = narrowest_unsigned_type (integer.low, integer.high, flags);
588 enum integer_type_kind itk_s
589 = narrowest_signed_type (integer.low, integer.high, flags);
591 /* In both C89 and C99, octal and hex constants may be signed or
592 unsigned, whichever fits tighter. We do not warn about this
593 choice differing from the traditional choice, as the constant
594 is probably a bit pattern and either way will work. */
595 if ((flags & CPP_N_RADIX) != CPP_N_DECIMAL)
596 itk = MIN (itk_u, itk_s);
599 /* In C99, decimal constants are always signed.
600 In C89, decimal constants that don't fit in long have
601 undefined behavior; we try to make them unsigned long.
602 In GCC's extended C89, that last is true of decimal
603 constants that don't fit in long long, too. */
606 if (itk_s > itk_u && itk_s > itk_long)
610 if (itk_u < itk_unsigned_long)
611 itk_u = itk_unsigned_long;
613 warning (0, "this decimal constant is unsigned only in ISO C90");
616 warning (OPT_Wtraditional,
617 "this decimal constant would be unsigned in ISO C90");
623 /* cpplib has already issued a warning for overflow. */
624 type = ((flags & CPP_N_UNSIGNED)
625 ? widest_unsigned_literal_type_node
626 : widest_integer_literal_type_node);
628 type = integer_types[itk];
630 if (itk > itk_unsigned_long
631 && (flags & CPP_N_WIDTH) != CPP_N_LARGE
632 && !in_system_header && !flag_isoc99)
633 pedwarn ("integer constant is too large for %qs type",
634 (flags & CPP_N_UNSIGNED) ? "unsigned long" : "long");
636 value = build_int_cst_wide (type, integer.low, integer.high);
638 /* Convert imaginary to a complex type. */
639 if (flags & CPP_N_IMAGINARY)
640 value = build_complex (NULL_TREE, build_int_cst (type, 0), value);
645 /* Interpret TOKEN, a floating point number with FLAGS as classified
648 interpret_float (const cpp_token *token, unsigned int flags)
652 REAL_VALUE_TYPE real;
656 /* Decode _Fract and _Accum. */
657 if (flags & CPP_N_FRACT || flags & CPP_N_ACCUM)
658 return interpret_fixed (token, flags);
660 /* Decode type based on width and properties. */
661 if (flags & CPP_N_DFLOAT)
662 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
663 type = dfloat128_type_node;
664 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
665 type = dfloat32_type_node;
667 type = dfloat64_type_node;
669 if (flags & CPP_N_WIDTH_MD)
672 enum machine_mode mode;
674 if ((flags & CPP_N_WIDTH_MD) == CPP_N_MD_W)
679 mode = targetm.c.mode_for_suffix (suffix);
680 if (mode == VOIDmode)
682 error ("unsupported non-standard suffix on floating constant");
685 return error_mark_node;
688 pedwarn ("non-standard suffix on floating constant");
690 type = c_common_type_for_mode (mode, 0);
693 else if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
694 type = long_double_type_node;
695 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL
696 || flag_single_precision_constant)
697 type = float_type_node;
699 type = double_type_node;
701 /* Copy the constant to a nul-terminated buffer. If the constant
702 has any suffixes, cut them off; REAL_VALUE_ATOF/ REAL_VALUE_HTOF
703 can't handle them. */
704 copylen = token->val.str.len;
705 if (flags & CPP_N_DFLOAT)
709 if ((flags & CPP_N_WIDTH) != CPP_N_MEDIUM)
710 /* Must be an F or L or machine defined suffix. */
712 if (flags & CPP_N_IMAGINARY)
717 copy = (char *) alloca (copylen + 1);
718 memcpy (copy, token->val.str.text, copylen);
719 copy[copylen] = '\0';
721 real_from_string3 (&real, copy, TYPE_MODE (type));
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))
729 if (!MODE_HAS_INFINITIES (TYPE_MODE (type)))
730 pedwarn ("floating constant exceeds range of %qT", type);
732 warning (OPT_Woverflow, "floating constant exceeds range of %qT", type);
734 /* We also give a warning if the value underflows. */
735 else if (REAL_VALUES_EQUAL (real, dconst0))
737 REAL_VALUE_TYPE realvoidmode;
738 int overflow = real_from_string (&realvoidmode, copy);
739 if (overflow < 0 || !REAL_VALUES_EQUAL (realvoidmode, dconst0))
740 warning (OPT_Woverflow, "floating constant truncated to zero");
743 /* Create a node with determined type and value. */
744 value = build_real (type, real);
745 if (flags & CPP_N_IMAGINARY)
746 value = build_complex (NULL_TREE, convert (type, integer_zero_node), value);
751 /* Interpret TOKEN, a fixed-point number with FLAGS as classified
755 interpret_fixed (const cpp_token *token, unsigned int flags)
759 FIXED_VALUE_TYPE fixed;
763 copylen = token->val.str.len;
765 if (flags & CPP_N_FRACT) /* _Fract. */
767 if (flags & CPP_N_UNSIGNED) /* Unsigned _Fract. */
769 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
771 type = unsigned_long_long_fract_type_node;
774 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
776 type = unsigned_long_fract_type_node;
779 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
781 type = unsigned_short_fract_type_node;
786 type = unsigned_fract_type_node;
790 else /* Signed _Fract. */
792 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
794 type = long_long_fract_type_node;
797 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
799 type = long_fract_type_node;
802 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
804 type = short_fract_type_node;
809 type = fract_type_node;
816 if (flags & CPP_N_UNSIGNED) /* Unsigned _Accum. */
818 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
820 type = unsigned_long_long_accum_type_node;
823 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
825 type = unsigned_long_accum_type_node;
828 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
830 type = unsigned_short_accum_type_node;
835 type = unsigned_accum_type_node;
839 else /* Signed _Accum. */
841 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
843 type = long_long_accum_type_node;
846 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
848 type = long_accum_type_node;
851 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
853 type = short_accum_type_node;
858 type = accum_type_node;
864 copy = (char *) alloca (copylen + 1);
865 memcpy (copy, token->val.str.text, copylen);
866 copy[copylen] = '\0';
868 fixed_from_string (&fixed, copy, TYPE_MODE (type));
870 /* Create a node with determined type and value. */
871 value = build_fixed (type, fixed);
876 /* Convert a series of STRING and/or WSTRING tokens into a tree,
877 performing string constant concatenation. TOK is the first of
878 these. VALP is the location to write the string into. OBJC_STRING
879 indicates whether an '@' token preceded the incoming token.
880 Returns the CPP token type of the result (CPP_STRING, CPP_WSTRING,
883 This is unfortunately more work than it should be. If any of the
884 strings in the series has an L prefix, the result is a wide string
885 (6.4.5p4). Whether or not the result is a wide string affects the
886 meaning of octal and hexadecimal escapes (6.4.4.4p6,9). But escape
887 sequences do not continue across the boundary between two strings in
888 a series (6.4.5p7), so we must not lose the boundaries. Therefore
889 cpp_interpret_string takes a vector of cpp_string structures, which
890 we must arrange to provide. */
892 static enum cpp_ttype
893 lex_string (const cpp_token *tok, tree *valp, bool objc_string)
898 struct obstack str_ob;
901 /* Try to avoid the overhead of creating and destroying an obstack
902 for the common case of just one string. */
903 cpp_string str = tok->val.str;
904 cpp_string *strs = &str;
906 if (tok->type == CPP_WSTRING)
910 tok = cpp_get_token (parse_in);
916 if (c_dialect_objc ())
933 gcc_obstack_init (&str_ob);
934 obstack_grow (&str_ob, &str, sizeof (cpp_string));
938 obstack_grow (&str_ob, &tok->val.str, sizeof (cpp_string));
942 /* We have read one more token than we want. */
943 _cpp_backup_tokens (parse_in, 1);
945 strs = XOBFINISH (&str_ob, cpp_string *);
947 if (concats && !objc_string && !in_system_header)
948 warning (OPT_Wtraditional,
949 "traditional C rejects string constant concatenation");
951 if ((c_lex_string_translate
952 ? cpp_interpret_string : cpp_interpret_string_notranslate)
953 (parse_in, strs, concats + 1, &istr, wide))
955 value = build_string (istr.len, (const char *) istr.text);
956 free (CONST_CAST (unsigned char *, istr.text));
958 if (c_lex_string_translate == -1)
960 int xlated = cpp_interpret_string_notranslate (parse_in, strs,
963 /* Assume that, if we managed to translate the string above,
964 then the untranslated parsing will always succeed. */
967 if (TREE_STRING_LENGTH (value) != (int) istr.len
968 || 0 != strncmp (TREE_STRING_POINTER (value),
969 (const char *) istr.text, istr.len))
971 /* Arrange for us to return the untranslated string in
972 *valp, but to set up the C type of the translated
974 *valp = build_string (istr.len, (const char *) istr.text);
975 valp = &TREE_CHAIN (*valp);
977 free (CONST_CAST (unsigned char *, istr.text));
982 /* Callers cannot generally handle error_mark_node in this context,
983 so return the empty string instead. cpp_interpret_string has
986 value = build_string (TYPE_PRECISION (wchar_type_node)
987 / TYPE_PRECISION (char_type_node),
988 "\0\0\0"); /* widest supported wchar_t
991 value = build_string (1, "");
994 TREE_TYPE (value) = wide ? wchar_array_type_node : char_array_type_node;
995 *valp = fix_string_type (value);
998 obstack_free (&str_ob, 0);
1000 return objc_string ? CPP_OBJC_STRING : wide ? CPP_WSTRING : CPP_STRING;
1003 /* Converts a (possibly wide) character constant token into a tree. */
1005 lex_charconst (const cpp_token *token)
1009 unsigned int chars_seen;
1012 result = cpp_interpret_charconst (parse_in, token,
1013 &chars_seen, &unsignedp);
1015 if (token->type == CPP_WCHAR)
1016 type = wchar_type_node;
1017 /* In C, a character constant has type 'int'.
1018 In C++ 'char', but multi-char charconsts have type 'int'. */
1019 else if (!c_dialect_cxx () || chars_seen > 1)
1020 type = integer_type_node;
1022 type = char_type_node;
1024 /* Cast to cppchar_signed_t to get correct sign-extension of RESULT
1025 before possibly widening to HOST_WIDE_INT for build_int_cst. */
1026 if (unsignedp || (cppchar_signed_t) result >= 0)
1027 value = build_int_cst_wide (type, result, 0);
1029 value = build_int_cst_wide (type, (cppchar_signed_t) result, -1);