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
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 static tree
interpret_integer (const cpp_token
*, unsigned int);
53 static tree
interpret_float (const cpp_token
*, unsigned int);
54 static tree
interpret_fixed (const cpp_token
*, unsigned int);
55 static enum integer_type_kind narrowest_unsigned_type
56 (unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
, unsigned int);
57 static enum integer_type_kind narrowest_signed_type
58 (unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
, unsigned int);
59 static enum cpp_ttype
lex_string (const cpp_token
*, tree
*, bool, bool);
60 static tree
lex_charconst (const cpp_token
*);
61 static void update_header_times (const char *);
62 static int dump_one_header (splay_tree_node
, void *);
63 static void cb_line_change (cpp_reader
*, const cpp_token
*, int);
64 static void cb_ident (cpp_reader
*, unsigned int, const cpp_string
*);
65 static void cb_def_pragma (cpp_reader
*, unsigned int);
66 static void cb_define (cpp_reader
*, unsigned int, cpp_hashnode
*);
67 static void cb_undef (cpp_reader
*, unsigned int, cpp_hashnode
*);
72 struct cpp_callbacks
*cb
;
73 struct c_fileinfo
*toplevel
;
75 /* The get_fileinfo data structure must be initialized before
76 cpp_read_main_file is called. */
77 toplevel
= get_fileinfo ("<top level>");
78 if (flag_detailed_statistics
)
81 body_time
= get_run_time ();
82 toplevel
->time
= body_time
;
85 cb
= cpp_get_callbacks (parse_in
);
87 cb
->line_change
= cb_line_change
;
89 cb
->def_pragma
= cb_def_pragma
;
90 cb
->valid_pch
= c_common_valid_pch
;
91 cb
->read_pch
= c_common_read_pch
;
93 /* Set the debug callbacks if we can use them. */
94 if (debug_info_level
== DINFO_LEVEL_VERBOSE
95 && (write_symbols
== DWARF2_DEBUG
96 || write_symbols
== VMS_AND_DWARF2_DEBUG
))
98 cb
->define
= cb_define
;
104 get_fileinfo (const char *name
)
107 struct c_fileinfo
*fi
;
110 file_info_tree
= splay_tree_new ((splay_tree_compare_fn
) strcmp
,
112 (splay_tree_delete_value_fn
) free
);
114 n
= splay_tree_lookup (file_info_tree
, (splay_tree_key
) name
);
116 return (struct c_fileinfo
*) n
->value
;
118 fi
= XNEW (struct c_fileinfo
);
120 fi
->interface_only
= 0;
121 fi
->interface_unknown
= 1;
122 splay_tree_insert (file_info_tree
, (splay_tree_key
) name
,
123 (splay_tree_value
) fi
);
128 update_header_times (const char *name
)
130 /* Changing files again. This means currently collected time
131 is charged against header time, and body time starts back at 0. */
132 if (flag_detailed_statistics
)
134 int this_time
= get_run_time ();
135 struct c_fileinfo
*file
= get_fileinfo (name
);
136 header_time
+= this_time
- body_time
;
137 file
->time
+= this_time
- body_time
;
138 body_time
= this_time
;
143 dump_one_header (splay_tree_node n
, void * ARG_UNUSED (dummy
))
145 print_time ((const char *) n
->key
,
146 ((struct c_fileinfo
*) n
->value
)->time
);
151 dump_time_statistics (void)
153 struct c_fileinfo
*file
= get_fileinfo (input_filename
);
154 int this_time
= get_run_time ();
155 file
->time
+= this_time
- body_time
;
157 fprintf (stderr
, "\n******\n");
158 print_time ("header files (total)", header_time
);
159 print_time ("main file (total)", this_time
- body_time
);
160 fprintf (stderr
, "ratio = %g : 1\n",
161 (double) header_time
/ (double) (this_time
- body_time
));
162 fprintf (stderr
, "\n******\n");
164 splay_tree_foreach (file_info_tree
, dump_one_header
, 0);
168 cb_ident (cpp_reader
* ARG_UNUSED (pfile
),
169 unsigned int ARG_UNUSED (line
),
170 const cpp_string
* ARG_UNUSED (str
))
172 #ifdef ASM_OUTPUT_IDENT
175 /* Convert escapes in the string. */
176 cpp_string cstr
= { 0, 0 };
177 if (cpp_interpret_string (pfile
, str
, 1, &cstr
, false))
179 ASM_OUTPUT_IDENT (asm_out_file
, (const char *) cstr
.text
);
180 free (CONST_CAST (unsigned char *, cstr
.text
));
186 /* Called at the start of every non-empty line. TOKEN is the first
187 lexed token on the line. Used for diagnostic line numbers. */
189 cb_line_change (cpp_reader
* ARG_UNUSED (pfile
), const cpp_token
*token
,
192 if (token
->type
!= CPP_EOF
&& !parsing_args
)
193 input_location
= token
->src_loc
;
197 fe_file_change (const struct line_map
*new_map
)
202 if (new_map
->reason
== LC_ENTER
)
204 /* Don't stack the main buffer on the input stack;
205 we already did in compile_file. */
206 if (!MAIN_FILE_P (new_map
))
208 int included_at
= LAST_SOURCE_LINE_LOCATION (new_map
- 1);
210 input_location
= new_map
->start_location
;
211 (*debug_hooks
->start_source_file
) (included_at
, new_map
->to_file
);
212 #ifndef NO_IMPLICIT_EXTERN_C
215 else if (new_map
->sysp
== 2)
218 ++pending_lang_change
;
223 else if (new_map
->reason
== LC_LEAVE
)
225 #ifndef NO_IMPLICIT_EXTERN_C
226 if (c_header_level
&& --c_header_level
== 0)
228 if (new_map
->sysp
== 2)
229 warning (0, "badly nested C headers from preprocessor");
230 --pending_lang_change
;
233 input_location
= new_map
->start_location
;
235 (*debug_hooks
->end_source_file
) (new_map
->to_line
);
238 update_header_times (new_map
->to_file
);
239 in_system_header
= new_map
->sysp
!= 0;
240 input_location
= new_map
->start_location
;
244 cb_def_pragma (cpp_reader
*pfile
, source_location loc
)
246 /* Issue a warning message if we have been asked to do so. Ignore
247 unknown pragmas in system headers unless an explicit
248 -Wunknown-pragmas has been given. */
249 if (warn_unknown_pragmas
> in_system_header
)
251 const unsigned char *space
, *name
;
253 location_t fe_loc
= loc
;
255 space
= name
= (const unsigned char *) "";
256 s
= cpp_get_token (pfile
);
257 if (s
->type
!= CPP_EOF
)
259 space
= cpp_token_as_text (pfile
, s
);
260 s
= cpp_get_token (pfile
);
261 if (s
->type
== CPP_NAME
)
262 name
= cpp_token_as_text (pfile
, s
);
265 warning (OPT_Wunknown_pragmas
, "%Hignoring #pragma %s %s",
266 &fe_loc
, space
, name
);
270 /* #define callback for DWARF and DWARF2 debug info. */
272 cb_define (cpp_reader
*pfile
, source_location loc
, cpp_hashnode
*node
)
274 const struct line_map
*map
= linemap_lookup (line_table
, loc
);
275 (*debug_hooks
->define
) (SOURCE_LINE (map
, loc
),
276 (const char *) cpp_macro_definition (pfile
, node
));
279 /* #undef callback for DWARF and DWARF2 debug info. */
281 cb_undef (cpp_reader
* ARG_UNUSED (pfile
), source_location loc
,
284 const struct line_map
*map
= linemap_lookup (line_table
, loc
);
285 (*debug_hooks
->undef
) (SOURCE_LINE (map
, loc
),
286 (const char *) NODE_NAME (node
));
289 /* Read a token and return its type. Fill *VALUE with its value, if
290 applicable. Fill *CPP_FLAGS with the token's flags, if it is
294 c_lex_with_flags (tree
*value
, location_t
*loc
, unsigned char *cpp_flags
,
297 static bool no_more_pch
;
298 const cpp_token
*tok
;
300 unsigned char add_flags
= 0;
302 timevar_push (TV_CPP
);
304 tok
= cpp_get_token_with_location (parse_in
, loc
);
314 *value
= HT_IDENT_TO_GCC_IDENT (HT_NODE (tok
->val
.node
));
319 unsigned int flags
= cpp_classify_number (parse_in
, tok
);
321 switch (flags
& CPP_N_CATEGORY
)
324 /* cpplib has issued an error. */
325 *value
= error_mark_node
;
330 /* C++ uses '0' to mark virtual functions as pure.
331 Set PURE_ZERO to pass this information to the C++ parser. */
332 if (tok
->val
.str
.len
== 1 && *tok
->val
.str
.text
== '0')
333 add_flags
= PURE_ZERO
;
334 *value
= interpret_integer (tok
, flags
);
338 *value
= interpret_float (tok
, flags
);
348 /* An @ may give the next token special significance in Objective-C. */
349 if (c_dialect_objc ())
351 location_t atloc
= *loc
;
355 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
));
369 if (objc_is_reserved_word (*value
))
378 error ("%Hstray %<@%> in program", &atloc
);
389 unsigned char name
[4];
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
);
413 *value
= lex_charconst (tok
);
418 if ((lex_flags
& C_LEX_RAW_STRINGS
) == 0)
420 type
= lex_string (tok
, value
, false,
421 (lex_flags
& C_LEX_STRING_NO_TRANSLATE
) == 0);
424 *value
= build_string (tok
->val
.str
.len
, (const char *) tok
->val
.str
.text
);
428 *value
= build_int_cst (NULL
, tok
->val
.pragma
);
431 /* These tokens should not be visible outside cpplib. */
432 case CPP_HEADER_NAME
:
443 *cpp_flags
= tok
->flags
| add_flags
;
448 c_common_no_more_pch ();
451 timevar_pop (TV_CPP
);
456 /* Returns the narrowest C-visible unsigned type, starting with the
457 minimum specified by FLAGS, that can fit HIGH:LOW, or itk_none if
460 static enum integer_type_kind
461 narrowest_unsigned_type (unsigned HOST_WIDE_INT low
,
462 unsigned HOST_WIDE_INT high
,
465 enum integer_type_kind itk
;
467 if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
468 itk
= itk_unsigned_int
;
469 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
470 itk
= itk_unsigned_long
;
472 itk
= itk_unsigned_long_long
;
474 for (; itk
< itk_none
; itk
+= 2 /* skip unsigned types */)
476 tree upper
= TYPE_MAX_VALUE (integer_types
[itk
]);
478 if ((unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (upper
) > high
479 || ((unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (upper
) == high
480 && TREE_INT_CST_LOW (upper
) >= low
))
487 /* Ditto, but narrowest signed type. */
488 static enum integer_type_kind
489 narrowest_signed_type (unsigned HOST_WIDE_INT low
,
490 unsigned HOST_WIDE_INT high
, unsigned int flags
)
492 enum integer_type_kind itk
;
494 if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
496 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
502 for (; itk
< itk_none
; itk
+= 2 /* skip signed types */)
504 tree upper
= TYPE_MAX_VALUE (integer_types
[itk
]);
506 if ((unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (upper
) > high
507 || ((unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (upper
) == high
508 && TREE_INT_CST_LOW (upper
) >= low
))
515 /* Interpret TOKEN, an integer with FLAGS as classified by cpplib. */
517 interpret_integer (const cpp_token
*token
, unsigned int flags
)
520 enum integer_type_kind itk
;
522 cpp_options
*options
= cpp_get_options (parse_in
);
524 integer
= cpp_interpret_integer (parse_in
, token
, flags
);
525 integer
= cpp_num_sign_extend (integer
, options
->precision
);
527 /* The type of a constant with a U suffix is straightforward. */
528 if (flags
& CPP_N_UNSIGNED
)
529 itk
= narrowest_unsigned_type (integer
.low
, integer
.high
, flags
);
532 /* The type of a potentially-signed integer constant varies
533 depending on the base it's in, the standard in use, and the
535 enum integer_type_kind itk_u
536 = narrowest_unsigned_type (integer
.low
, integer
.high
, flags
);
537 enum integer_type_kind itk_s
538 = narrowest_signed_type (integer
.low
, integer
.high
, flags
);
540 /* In both C89 and C99, octal and hex constants may be signed or
541 unsigned, whichever fits tighter. We do not warn about this
542 choice differing from the traditional choice, as the constant
543 is probably a bit pattern and either way will work. */
544 if ((flags
& CPP_N_RADIX
) != CPP_N_DECIMAL
)
545 itk
= MIN (itk_u
, itk_s
);
548 /* In C99, decimal constants are always signed.
549 In C89, decimal constants that don't fit in long have
550 undefined behavior; we try to make them unsigned long.
551 In GCC's extended C89, that last is true of decimal
552 constants that don't fit in long long, too. */
555 if (itk_s
> itk_u
&& itk_s
> itk_long
)
559 if (itk_u
< itk_unsigned_long
)
560 itk_u
= itk_unsigned_long
;
562 warning (0, "this decimal constant is unsigned only in ISO C90");
565 warning (OPT_Wtraditional
,
566 "this decimal constant would be unsigned in ISO C90");
572 /* cpplib has already issued a warning for overflow. */
573 type
= ((flags
& CPP_N_UNSIGNED
)
574 ? widest_unsigned_literal_type_node
575 : widest_integer_literal_type_node
);
577 type
= integer_types
[itk
];
579 if (itk
> itk_unsigned_long
580 && (flags
& CPP_N_WIDTH
) != CPP_N_LARGE
581 && !in_system_header
&& !flag_isoc99
)
582 pedwarn ("integer constant is too large for %qs type",
583 (flags
& CPP_N_UNSIGNED
) ? "unsigned long" : "long");
585 value
= build_int_cst_wide (type
, integer
.low
, integer
.high
);
587 /* Convert imaginary to a complex type. */
588 if (flags
& CPP_N_IMAGINARY
)
589 value
= build_complex (NULL_TREE
, build_int_cst (type
, 0), value
);
594 /* Interpret TOKEN, a floating point number with FLAGS as classified
597 interpret_float (const cpp_token
*token
, unsigned int flags
)
601 REAL_VALUE_TYPE real
;
605 /* Decode _Fract and _Accum. */
606 if (flags
& CPP_N_FRACT
|| flags
& CPP_N_ACCUM
)
607 return interpret_fixed (token
, flags
);
609 /* Decode type based on width and properties. */
610 if (flags
& CPP_N_DFLOAT
)
611 if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
612 type
= dfloat128_type_node
;
613 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
614 type
= dfloat32_type_node
;
616 type
= dfloat64_type_node
;
618 if (flags
& CPP_N_WIDTH_MD
)
621 enum machine_mode mode
;
623 if ((flags
& CPP_N_WIDTH_MD
) == CPP_N_MD_W
)
628 mode
= targetm
.c
.mode_for_suffix (suffix
);
629 if (mode
== VOIDmode
)
631 error ("unsupported non-standard suffix on floating constant");
634 return error_mark_node
;
637 pedwarn ("non-standard suffix on floating constant");
639 type
= c_common_type_for_mode (mode
, 0);
642 else if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
643 type
= long_double_type_node
;
644 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
645 || flag_single_precision_constant
)
646 type
= float_type_node
;
648 type
= double_type_node
;
650 /* Copy the constant to a nul-terminated buffer. If the constant
651 has any suffixes, cut them off; REAL_VALUE_ATOF/ REAL_VALUE_HTOF
652 can't handle them. */
653 copylen
= token
->val
.str
.len
;
654 if (flags
& CPP_N_DFLOAT
)
658 if ((flags
& CPP_N_WIDTH
) != CPP_N_MEDIUM
)
659 /* Must be an F or L or machine defined suffix. */
661 if (flags
& CPP_N_IMAGINARY
)
666 copy
= (char *) alloca (copylen
+ 1);
667 memcpy (copy
, token
->val
.str
.text
, copylen
);
668 copy
[copylen
] = '\0';
670 real_from_string3 (&real
, copy
, TYPE_MODE (type
));
672 /* Both C and C++ require a diagnostic for a floating constant
673 outside the range of representable values of its type. Since we
674 have __builtin_inf* to produce an infinity, this is now a
675 mandatory pedwarn if the target does not support infinities. */
676 if (REAL_VALUE_ISINF (real
))
678 if (!MODE_HAS_INFINITIES (TYPE_MODE (type
)))
679 pedwarn ("floating constant exceeds range of %qT", type
);
681 warning (OPT_Woverflow
, "floating constant exceeds range of %qT", type
);
683 /* We also give a warning if the value underflows. */
684 else if (REAL_VALUES_EQUAL (real
, dconst0
))
686 REAL_VALUE_TYPE realvoidmode
;
687 int overflow
= real_from_string (&realvoidmode
, copy
);
688 if (overflow
< 0 || !REAL_VALUES_EQUAL (realvoidmode
, dconst0
))
689 warning (OPT_Woverflow
, "floating constant truncated to zero");
692 /* Create a node with determined type and value. */
693 value
= build_real (type
, real
);
694 if (flags
& CPP_N_IMAGINARY
)
695 value
= build_complex (NULL_TREE
, convert (type
, integer_zero_node
), value
);
700 /* Interpret TOKEN, a fixed-point number with FLAGS as classified
704 interpret_fixed (const cpp_token
*token
, unsigned int flags
)
708 FIXED_VALUE_TYPE fixed
;
712 copylen
= token
->val
.str
.len
;
714 if (flags
& CPP_N_FRACT
) /* _Fract. */
716 if (flags
& CPP_N_UNSIGNED
) /* Unsigned _Fract. */
718 if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
720 type
= unsigned_long_long_fract_type_node
;
723 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
725 type
= unsigned_long_fract_type_node
;
728 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
730 type
= unsigned_short_fract_type_node
;
735 type
= unsigned_fract_type_node
;
739 else /* Signed _Fract. */
741 if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
743 type
= long_long_fract_type_node
;
746 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
748 type
= long_fract_type_node
;
751 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
753 type
= short_fract_type_node
;
758 type
= fract_type_node
;
765 if (flags
& CPP_N_UNSIGNED
) /* Unsigned _Accum. */
767 if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
769 type
= unsigned_long_long_accum_type_node
;
772 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
774 type
= unsigned_long_accum_type_node
;
777 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
779 type
= unsigned_short_accum_type_node
;
784 type
= unsigned_accum_type_node
;
788 else /* Signed _Accum. */
790 if ((flags
& CPP_N_WIDTH
) == CPP_N_LARGE
)
792 type
= long_long_accum_type_node
;
795 else if ((flags
& CPP_N_WIDTH
) == CPP_N_MEDIUM
)
797 type
= long_accum_type_node
;
800 else if ((flags
& CPP_N_WIDTH
) == CPP_N_SMALL
)
802 type
= short_accum_type_node
;
807 type
= accum_type_node
;
813 copy
= (char *) alloca (copylen
+ 1);
814 memcpy (copy
, token
->val
.str
.text
, copylen
);
815 copy
[copylen
] = '\0';
817 fixed_from_string (&fixed
, copy
, TYPE_MODE (type
));
819 /* Create a node with determined type and value. */
820 value
= build_fixed (type
, fixed
);
825 /* Convert a series of STRING and/or WSTRING tokens into a tree,
826 performing string constant concatenation. TOK is the first of
827 these. VALP is the location to write the string into. OBJC_STRING
828 indicates whether an '@' token preceded the incoming token.
829 Returns the CPP token type of the result (CPP_STRING, CPP_WSTRING,
832 This is unfortunately more work than it should be. If any of the
833 strings in the series has an L prefix, the result is a wide string
834 (6.4.5p4). Whether or not the result is a wide string affects the
835 meaning of octal and hexadecimal escapes (6.4.4.4p6,9). But escape
836 sequences do not continue across the boundary between two strings in
837 a series (6.4.5p7), so we must not lose the boundaries. Therefore
838 cpp_interpret_string takes a vector of cpp_string structures, which
839 we must arrange to provide. */
841 static enum cpp_ttype
842 lex_string (const cpp_token
*tok
, tree
*valp
, bool objc_string
, bool translate
)
847 struct obstack str_ob
;
850 /* Try to avoid the overhead of creating and destroying an obstack
851 for the common case of just one string. */
852 cpp_string str
= tok
->val
.str
;
853 cpp_string
*strs
= &str
;
855 if (tok
->type
== CPP_WSTRING
)
859 tok
= cpp_get_token (parse_in
);
865 if (c_dialect_objc ())
882 gcc_obstack_init (&str_ob
);
883 obstack_grow (&str_ob
, &str
, sizeof (cpp_string
));
887 obstack_grow (&str_ob
, &tok
->val
.str
, sizeof (cpp_string
));
891 /* We have read one more token than we want. */
892 _cpp_backup_tokens (parse_in
, 1);
894 strs
= XOBFINISH (&str_ob
, cpp_string
*);
896 if (concats
&& !objc_string
&& !in_system_header
)
897 warning (OPT_Wtraditional
,
898 "traditional C rejects string constant concatenation");
901 ? cpp_interpret_string
: cpp_interpret_string_notranslate
)
902 (parse_in
, strs
, concats
+ 1, &istr
, wide
))
904 value
= build_string (istr
.len
, (const char *) istr
.text
);
905 free (CONST_CAST (unsigned char *, istr
.text
));
909 /* Callers cannot generally handle error_mark_node in this context,
910 so return the empty string instead. cpp_interpret_string has
913 value
= build_string (TYPE_PRECISION (wchar_type_node
)
914 / TYPE_PRECISION (char_type_node
),
915 "\0\0\0"); /* widest supported wchar_t
918 value
= build_string (1, "");
921 TREE_TYPE (value
) = wide
? wchar_array_type_node
: char_array_type_node
;
922 *valp
= fix_string_type (value
);
925 obstack_free (&str_ob
, 0);
927 return objc_string
? CPP_OBJC_STRING
: wide
? CPP_WSTRING
: CPP_STRING
;
930 /* Converts a (possibly wide) character constant token into a tree. */
932 lex_charconst (const cpp_token
*token
)
936 unsigned int chars_seen
;
939 result
= cpp_interpret_charconst (parse_in
, token
,
940 &chars_seen
, &unsignedp
);
942 if (token
->type
== CPP_WCHAR
)
943 type
= wchar_type_node
;
944 /* In C, a character constant has type 'int'.
945 In C++ 'char', but multi-char charconsts have type 'int'. */
946 else if (!c_dialect_cxx () || chars_seen
> 1)
947 type
= integer_type_node
;
949 type
= char_type_node
;
951 /* Cast to cppchar_signed_t to get correct sign-extension of RESULT
952 before possibly widening to HOST_WIDE_INT for build_int_cst. */
953 if (unsignedp
|| (cppchar_signed_t
) result
>= 0)
954 value
= build_int_cst_wide (type
, result
, 0);
956 value
= build_int_cst_wide (type
, (cppchar_signed_t
) result
, -1);