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
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 #include "coretypes.h"
42 #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 enum integer_type_kind narrowest_unsigned_type
65 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
66 static enum integer_type_kind narrowest_signed_type
67 (unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT, unsigned int);
68 static enum cpp_ttype lex_string (const cpp_token *, tree *, bool);
69 static tree lex_charconst (const cpp_token *);
70 static void update_header_times (const char *);
71 static int dump_one_header (splay_tree_node, void *);
72 static void cb_line_change (cpp_reader *, const cpp_token *, int);
73 static void cb_ident (cpp_reader *, unsigned int, const cpp_string *);
74 static void cb_def_pragma (cpp_reader *, unsigned int);
75 static void cb_define (cpp_reader *, unsigned int, cpp_hashnode *);
76 static void cb_undef (cpp_reader *, unsigned int, cpp_hashnode *);
81 struct cpp_callbacks *cb;
82 struct c_fileinfo *toplevel;
84 /* The get_fileinfo data structure must be initialized before
85 cpp_read_main_file is called. */
86 toplevel = get_fileinfo ("<top level>");
87 if (flag_detailed_statistics)
90 body_time = get_run_time ();
91 toplevel->time = body_time;
94 cb = cpp_get_callbacks (parse_in);
96 cb->line_change = cb_line_change;
98 cb->def_pragma = cb_def_pragma;
99 cb->valid_pch = c_common_valid_pch;
100 cb->read_pch = c_common_read_pch;
102 /* Set the debug callbacks if we can use them. */
103 if (debug_info_level == DINFO_LEVEL_VERBOSE
104 && (write_symbols == DWARF2_DEBUG
105 || write_symbols == VMS_AND_DWARF2_DEBUG))
107 cb->define = cb_define;
108 cb->undef = cb_undef;
113 get_fileinfo (const char *name)
116 struct c_fileinfo *fi;
119 file_info_tree = splay_tree_new ((splay_tree_compare_fn) strcmp,
121 (splay_tree_delete_value_fn) free);
123 n = splay_tree_lookup (file_info_tree, (splay_tree_key) name);
125 return (struct c_fileinfo *) n->value;
127 fi = XNEW (struct c_fileinfo);
129 fi->interface_only = 0;
130 fi->interface_unknown = 1;
131 splay_tree_insert (file_info_tree, (splay_tree_key) name,
132 (splay_tree_value) fi);
137 update_header_times (const char *name)
139 /* Changing files again. This means currently collected time
140 is charged against header time, and body time starts back at 0. */
141 if (flag_detailed_statistics)
143 int this_time = get_run_time ();
144 struct c_fileinfo *file = get_fileinfo (name);
145 header_time += this_time - body_time;
146 file->time += this_time - body_time;
147 body_time = this_time;
152 dump_one_header (splay_tree_node n, void * ARG_UNUSED (dummy))
154 print_time ((const char *) n->key,
155 ((struct c_fileinfo *) n->value)->time);
160 dump_time_statistics (void)
162 struct c_fileinfo *file = get_fileinfo (input_filename);
163 int this_time = get_run_time ();
164 file->time += this_time - body_time;
166 fprintf (stderr, "\n******\n");
167 print_time ("header files (total)", header_time);
168 print_time ("main file (total)", this_time - body_time);
169 fprintf (stderr, "ratio = %g : 1\n",
170 (double) header_time / (double) (this_time - body_time));
171 fprintf (stderr, "\n******\n");
173 splay_tree_foreach (file_info_tree, dump_one_header, 0);
177 cb_ident (cpp_reader * ARG_UNUSED (pfile),
178 unsigned int ARG_UNUSED (line),
179 const cpp_string * ARG_UNUSED (str))
181 #ifdef ASM_OUTPUT_IDENT
184 /* Convert escapes in the string. */
185 cpp_string cstr = { 0, 0 };
186 if (cpp_interpret_string (pfile, str, 1, &cstr, false))
188 ASM_OUTPUT_IDENT (asm_out_file, (const char *) cstr.text);
189 free ((void *) cstr.text);
195 /* Called at the start of every non-empty line. TOKEN is the first
196 lexed token on the line. Used for diagnostic line numbers. */
198 cb_line_change (cpp_reader * ARG_UNUSED (pfile), const cpp_token *token,
201 if (token->type != CPP_EOF && !parsing_args)
202 #ifdef USE_MAPPED_LOCATION
203 input_location = token->src_loc;
206 source_location loc = token->src_loc;
207 const struct line_map *map = linemap_lookup (&line_table, loc);
208 input_line = SOURCE_LINE (map, loc);
214 fe_file_change (const struct line_map *new_map)
219 if (new_map->reason == LC_ENTER)
221 /* Don't stack the main buffer on the input stack;
222 we already did in compile_file. */
223 if (!MAIN_FILE_P (new_map))
225 #ifdef USE_MAPPED_LOCATION
226 int included_at = LAST_SOURCE_LINE_LOCATION (new_map - 1);
228 input_location = included_at;
229 push_srcloc (new_map->start_location);
231 int included_at = LAST_SOURCE_LINE (new_map - 1);
233 input_line = included_at;
234 push_srcloc (new_map->to_file, 1);
236 (*debug_hooks->start_source_file) (included_at, new_map->to_file);
237 #ifndef NO_IMPLICIT_EXTERN_C
240 else if (new_map->sysp == 2)
243 ++pending_lang_change;
248 else if (new_map->reason == LC_LEAVE)
250 #ifndef NO_IMPLICIT_EXTERN_C
251 if (c_header_level && --c_header_level == 0)
253 if (new_map->sysp == 2)
254 warning (0, "badly nested C headers from preprocessor");
255 --pending_lang_change;
260 (*debug_hooks->end_source_file) (new_map->to_line);
263 update_header_times (new_map->to_file);
264 in_system_header = new_map->sysp != 0;
265 #ifdef USE_MAPPED_LOCATION
266 input_location = new_map->start_location;
268 input_filename = new_map->to_file;
269 input_line = new_map->to_line;
274 cb_def_pragma (cpp_reader *pfile, source_location loc)
276 /* Issue a warning message if we have been asked to do so. Ignore
277 unknown pragmas in system headers unless an explicit
278 -Wunknown-pragmas has been given. */
279 if (warn_unknown_pragmas > in_system_header)
281 const unsigned char *space, *name;
283 #ifndef USE_MAPPED_LOCATION
285 const struct line_map *map = linemap_lookup (&line_table, loc);
286 fe_loc.file = map->to_file;
287 fe_loc.line = SOURCE_LINE (map, loc);
289 location_t fe_loc = loc;
292 space = name = (const unsigned char *) "";
293 s = cpp_get_token (pfile);
294 if (s->type != CPP_EOF)
296 space = cpp_token_as_text (pfile, s);
297 s = cpp_get_token (pfile);
298 if (s->type == CPP_NAME)
299 name = cpp_token_as_text (pfile, s);
302 warning (OPT_Wunknown_pragmas, "%Hignoring #pragma %s %s",
303 &fe_loc, space, name);
307 /* #define callback for DWARF and DWARF2 debug info. */
309 cb_define (cpp_reader *pfile, source_location loc, cpp_hashnode *node)
311 const struct line_map *map = linemap_lookup (&line_table, loc);
312 (*debug_hooks->define) (SOURCE_LINE (map, loc),
313 (const char *) cpp_macro_definition (pfile, node));
316 /* #undef callback for DWARF and DWARF2 debug info. */
318 cb_undef (cpp_reader * ARG_UNUSED (pfile), source_location loc,
321 const struct line_map *map = linemap_lookup (&line_table, loc);
322 (*debug_hooks->undef) (SOURCE_LINE (map, loc),
323 (const char *) NODE_NAME (node));
326 /* Read a token and return its type. Fill *VALUE with its value, if
327 applicable. Fill *CPP_FLAGS with the token's flags, if it is
331 c_lex_with_flags (tree *value, location_t *loc, unsigned char *cpp_flags)
333 static bool no_more_pch;
334 const cpp_token *tok;
336 unsigned char add_flags = 0;
338 timevar_push (TV_CPP);
340 tok = cpp_get_token (parse_in);
344 #ifdef USE_MAPPED_LOCATION
347 *loc = input_location;
355 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
360 unsigned int flags = cpp_classify_number (parse_in, tok);
362 switch (flags & CPP_N_CATEGORY)
365 /* cpplib has issued an error. */
366 *value = error_mark_node;
370 /* C++ uses '0' to mark virtual functions as pure.
371 Set PURE_ZERO to pass this information to the C++ parser. */
372 if (tok->val.str.len == 1 && *tok->val.str.text == '0')
373 add_flags = PURE_ZERO;
374 *value = interpret_integer (tok, flags);
378 *value = interpret_float (tok, flags);
388 /* An @ may give the next token special significance in Objective-C. */
389 if (c_dialect_objc ())
391 location_t atloc = input_location;
394 tok = cpp_get_token (parse_in);
403 type = lex_string (tok, value, true);
407 *value = HT_IDENT_TO_GCC_IDENT (HT_NODE (tok->val.node));
408 if (objc_is_reserved_word (*value))
417 error ("%Hstray %<@%> in program", &atloc);
427 unsigned char name[4];
429 *cpp_spell_token (parse_in, tok, name, true) = 0;
431 error ("stray %qs in program", name);
438 cppchar_t c = tok->val.str.text[0];
440 if (c == '"' || c == '\'')
441 error ("missing terminating %c character", (int) c);
442 else if (ISGRAPH (c))
443 error ("stray %qc in program", (int) c);
445 error ("stray %<\\%o%> in program", (int) c);
451 *value = lex_charconst (tok);
456 if (!c_lex_return_raw_strings)
458 type = lex_string (tok, value, false);
465 *value = build_string (tok->val.str.len, (char *) tok->val.str.text);
468 /* These tokens should not be visible outside cpplib. */
469 case CPP_HEADER_NAME:
480 *cpp_flags = tok->flags | add_flags;
485 c_common_no_more_pch ();
488 timevar_pop (TV_CPP);
494 pragma_lex (tree *value)
497 return c_lex_with_flags (value, &loc, NULL);
500 /* Returns the narrowest C-visible unsigned type, starting with the
501 minimum specified by FLAGS, that can fit HIGH:LOW, or itk_none if
504 static enum integer_type_kind
505 narrowest_unsigned_type (unsigned HOST_WIDE_INT low,
506 unsigned HOST_WIDE_INT high,
509 enum integer_type_kind itk;
511 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
512 itk = itk_unsigned_int;
513 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
514 itk = itk_unsigned_long;
516 itk = itk_unsigned_long_long;
518 for (; itk < itk_none; itk += 2 /* skip unsigned types */)
520 tree upper = TYPE_MAX_VALUE (integer_types[itk]);
522 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
523 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
524 && TREE_INT_CST_LOW (upper) >= low))
531 /* Ditto, but narrowest signed type. */
532 static enum integer_type_kind
533 narrowest_signed_type (unsigned HOST_WIDE_INT low,
534 unsigned HOST_WIDE_INT high, unsigned int flags)
536 enum integer_type_kind itk;
538 if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
540 else if ((flags & CPP_N_WIDTH) == CPP_N_MEDIUM)
546 for (; itk < itk_none; itk += 2 /* skip signed types */)
548 tree upper = TYPE_MAX_VALUE (integer_types[itk]);
550 if ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) > high
551 || ((unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (upper) == high
552 && TREE_INT_CST_LOW (upper) >= low))
559 /* Interpret TOKEN, an integer with FLAGS as classified by cpplib. */
561 interpret_integer (const cpp_token *token, unsigned int flags)
564 enum integer_type_kind itk;
566 cpp_options *options = cpp_get_options (parse_in);
568 integer = cpp_interpret_integer (parse_in, token, flags);
569 integer = cpp_num_sign_extend (integer, options->precision);
571 /* The type of a constant with a U suffix is straightforward. */
572 if (flags & CPP_N_UNSIGNED)
573 itk = narrowest_unsigned_type (integer.low, integer.high, flags);
576 /* The type of a potentially-signed integer constant varies
577 depending on the base it's in, the standard in use, and the
579 enum integer_type_kind itk_u
580 = narrowest_unsigned_type (integer.low, integer.high, flags);
581 enum integer_type_kind itk_s
582 = narrowest_signed_type (integer.low, integer.high, flags);
584 /* In both C89 and C99, octal and hex constants may be signed or
585 unsigned, whichever fits tighter. We do not warn about this
586 choice differing from the traditional choice, as the constant
587 is probably a bit pattern and either way will work. */
588 if ((flags & CPP_N_RADIX) != CPP_N_DECIMAL)
589 itk = MIN (itk_u, itk_s);
592 /* In C99, decimal constants are always signed.
593 In C89, decimal constants that don't fit in long have
594 undefined behavior; we try to make them unsigned long.
595 In GCC's extended C89, that last is true of decimal
596 constants that don't fit in long long, too. */
599 if (itk_s > itk_u && itk_s > itk_long)
603 if (itk_u < itk_unsigned_long)
604 itk_u = itk_unsigned_long;
606 warning (0, "this decimal constant is unsigned only in ISO C90");
609 warning (OPT_Wtraditional,
610 "this decimal constant would be unsigned in ISO C90");
616 /* cpplib has already issued a warning for overflow. */
617 type = ((flags & CPP_N_UNSIGNED)
618 ? widest_unsigned_literal_type_node
619 : widest_integer_literal_type_node);
621 type = integer_types[itk];
623 if (itk > itk_unsigned_long
624 && (flags & CPP_N_WIDTH) != CPP_N_LARGE
625 && !in_system_header && !flag_isoc99)
626 pedwarn ("integer constant is too large for %qs type",
627 (flags & CPP_N_UNSIGNED) ? "unsigned long" : "long");
629 value = build_int_cst_wide (type, integer.low, integer.high);
631 /* Convert imaginary to a complex type. */
632 if (flags & CPP_N_IMAGINARY)
633 value = build_complex (NULL_TREE, build_int_cst (type, 0), value);
638 /* Interpret TOKEN, a floating point number with FLAGS as classified
641 interpret_float (const cpp_token *token, unsigned int flags)
645 REAL_VALUE_TYPE real;
649 /* Decode type based on width and properties. */
650 if (flags & CPP_N_DFLOAT)
651 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
652 type = dfloat128_type_node;
653 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL)
654 type = dfloat32_type_node;
656 type = dfloat64_type_node;
658 if ((flags & CPP_N_WIDTH) == CPP_N_LARGE)
659 type = long_double_type_node;
660 else if ((flags & CPP_N_WIDTH) == CPP_N_SMALL
661 || flag_single_precision_constant)
662 type = float_type_node;
664 type = double_type_node;
666 /* Copy the constant to a nul-terminated buffer. If the constant
667 has any suffixes, cut them off; REAL_VALUE_ATOF/ REAL_VALUE_HTOF
668 can't handle them. */
669 copylen = token->val.str.len;
670 if (flags & CPP_N_DFLOAT)
674 if ((flags & CPP_N_WIDTH) != CPP_N_MEDIUM)
675 /* Must be an F or L suffix. */
677 if (flags & CPP_N_IMAGINARY)
682 copy = (char *) alloca (copylen + 1);
683 memcpy (copy, token->val.str.text, copylen);
684 copy[copylen] = '\0';
686 real_from_string3 (&real, copy, TYPE_MODE (type));
688 /* Both C and C++ require a diagnostic for a floating constant
689 outside the range of representable values of its type. Since we
690 have __builtin_inf* to produce an infinity, it might now be
691 appropriate for this to be a mandatory pedwarn rather than
692 conditioned on -pedantic. */
693 if (REAL_VALUE_ISINF (real) && pedantic)
694 pedwarn ("floating constant exceeds range of %qT", type);
696 /* Create a node with determined type and value. */
697 value = build_real (type, real);
698 if (flags & CPP_N_IMAGINARY)
699 value = build_complex (NULL_TREE, convert (type, integer_zero_node), value);
704 /* Convert a series of STRING and/or WSTRING tokens into a tree,
705 performing string constant concatenation. TOK is the first of
706 these. VALP is the location to write the string into. OBJC_STRING
707 indicates whether an '@' token preceded the incoming token.
708 Returns the CPP token type of the result (CPP_STRING, CPP_WSTRING,
711 This is unfortunately more work than it should be. If any of the
712 strings in the series has an L prefix, the result is a wide string
713 (6.4.5p4). Whether or not the result is a wide string affects the
714 meaning of octal and hexadecimal escapes (6.4.4.4p6,9). But escape
715 sequences do not continue across the boundary between two strings in
716 a series (6.4.5p7), so we must not lose the boundaries. Therefore
717 cpp_interpret_string takes a vector of cpp_string structures, which
718 we must arrange to provide. */
720 static enum cpp_ttype
721 lex_string (const cpp_token *tok, tree *valp, bool objc_string)
726 struct obstack str_ob;
729 /* Try to avoid the overhead of creating and destroying an obstack
730 for the common case of just one string. */
731 cpp_string str = tok->val.str;
732 cpp_string *strs = &str;
734 if (tok->type == CPP_WSTRING)
738 tok = cpp_get_token (parse_in);
744 if (c_dialect_objc ())
761 gcc_obstack_init (&str_ob);
762 obstack_grow (&str_ob, &str, sizeof (cpp_string));
766 obstack_grow (&str_ob, &tok->val.str, sizeof (cpp_string));
770 /* We have read one more token than we want. */
771 _cpp_backup_tokens (parse_in, 1);
773 strs = XOBFINISH (&str_ob, cpp_string *);
775 if (concats && !objc_string && !in_system_header)
776 warning (OPT_Wtraditional,
777 "traditional C rejects string constant concatenation");
779 if ((c_lex_string_translate
780 ? cpp_interpret_string : cpp_interpret_string_notranslate)
781 (parse_in, strs, concats + 1, &istr, wide))
783 value = build_string (istr.len, (char *) istr.text);
784 free ((void *) istr.text);
786 if (c_lex_string_translate == -1)
788 int xlated = cpp_interpret_string_notranslate (parse_in, strs,
791 /* Assume that, if we managed to translate the string above,
792 then the untranslated parsing will always succeed. */
795 if (TREE_STRING_LENGTH (value) != (int) istr.len
796 || 0 != strncmp (TREE_STRING_POINTER (value), (char *) istr.text,
799 /* Arrange for us to return the untranslated string in
800 *valp, but to set up the C type of the translated
802 *valp = build_string (istr.len, (char *) istr.text);
803 valp = &TREE_CHAIN (*valp);
805 free ((void *) istr.text);
810 /* Callers cannot generally handle error_mark_node in this context,
811 so return the empty string instead. cpp_interpret_string has
814 value = build_string (TYPE_PRECISION (wchar_type_node)
815 / TYPE_PRECISION (char_type_node),
816 "\0\0\0"); /* widest supported wchar_t
819 value = build_string (1, "");
822 TREE_TYPE (value) = wide ? wchar_array_type_node : char_array_type_node;
823 *valp = fix_string_type (value);
826 obstack_free (&str_ob, 0);
828 return objc_string ? CPP_OBJC_STRING : wide ? CPP_WSTRING : CPP_STRING;
831 /* Converts a (possibly wide) character constant token into a tree. */
833 lex_charconst (const cpp_token *token)
837 unsigned int chars_seen;
840 result = cpp_interpret_charconst (parse_in, token,
841 &chars_seen, &unsignedp);
843 if (token->type == CPP_WCHAR)
844 type = wchar_type_node;
845 /* In C, a character constant has type 'int'.
846 In C++ 'char', but multi-char charconsts have type 'int'. */
847 else if (!c_dialect_cxx () || chars_seen > 1)
848 type = integer_type_node;
850 type = char_type_node;
852 /* Cast to cppchar_signed_t to get correct sign-extension of RESULT
853 before possibly widening to HOST_WIDE_INT for build_int_cst. */
854 if (unsignedp || (cppchar_signed_t) result >= 0)
855 value = build_int_cst_wide (type, result, 0);
857 value = build_int_cst_wide (type, (cppchar_signed_t) result, -1);