libcpp/internal.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
   3    2008, 2009 Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 3, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; see the file COPYING3.  If not see
  17 <http://www.gnu.org/licenses/>.  */
  18
  19 /* This header defines all the internal data structures and functions
  20    that need to be visible across files.  It should not be used outside
  21    cpplib.  */
  22
  23 #ifndef LIBCPP_INTERNAL_H
  24 #define LIBCPP_INTERNAL_H
  25
  26 #include "symtab.h"
  27 #include "cpp-id-data.h"
  28
  29 #if HAVE_ICONV
  30 #include <iconv.h>
  31 #else
  32 #define HAVE_ICONV 0
  33 typedef int iconv_t;  /* dummy */
  34 #endif
  35
  36 struct directive;               /* Deliberately incomplete.  */
  37 struct pending_option;
  38 struct op;
  39 struct _cpp_strbuf;
  40
  41 typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
  42                            struct _cpp_strbuf *);
  43 struct cset_converter
  44 {
  45   convert_f func;
  46   iconv_t cd;
  47   int width;
  48 };
  49
  50 #define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
  51
  52 /* Test if a sign is valid within a preprocessing number.  */
  53 #define VALID_SIGN(c, prevc) \
  54   (((c) == '+' || (c) == '-') && \
  55    ((prevc) == 'e' || (prevc) == 'E' \
  56     || (((prevc) == 'p' || (prevc) == 'P') \
  57         && CPP_OPTION (pfile, extended_numbers))))
  58
  59 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  60 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  61 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
  62 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  63
  64 #define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
  65     const struct line_maps *line_table = PFILE->line_table; \
  66     const struct line_map *map = &line_table->maps[line_table->used-1]; \
  67     linenum_type line = SOURCE_LINE (map, line_table->highest_line); \
  68     linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
  69   } while (0)
  70
  71 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  72    efficiency, and partly to limit runaway recursion.  */
  73 #define CPP_STACK_MAX 200
  74
  75 /* Host alignment handling.  */
  76 struct dummy
  77 {
  78   char c;
  79   union
  80   {
  81     double d;
  82     int *p;
  83   } u;
  84 };
  85
  86 #define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
  87 #define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
  88 #define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
  89
  90 #define _cpp_mark_macro_used(NODE) do {                                 \
  91   if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))      \
  92     (NODE)->value.macro->used = 1; } while (0)
  93
  94 /* A generic memory buffer, and operations on it.  */
  95 typedef struct _cpp_buff _cpp_buff;
  96 struct _cpp_buff
  97 {
  98   struct _cpp_buff *next;
  99   unsigned char *base, *cur, *limit;
 100 };
 101
 102 extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
 103 extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
 104 extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
 105 extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
 106 extern void _cpp_free_buff (_cpp_buff *);
 107 extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
 108 extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
 109
 110 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
 111 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
 112 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
 113
 114 /* #include types.  */
 115 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
 116
 117 union utoken
 118 {
 119   const cpp_token *token;
 120   const cpp_token **ptoken;
 121 };
 122
 123 /* A "run" of tokens; part of a chain of runs.  */
 124 typedef struct tokenrun tokenrun;
 125 struct tokenrun
 126 {
 127   tokenrun *next, *prev;
 128   cpp_token *base, *limit;
 129 };
 130
 131 /* Accessor macros for struct cpp_context.  */
 132 #define FIRST(c) ((c)->u.iso.first)
 133 #define LAST(c) ((c)->u.iso.last)
 134 #define CUR(c) ((c)->u.trad.cur)
 135 #define RLIMIT(c) ((c)->u.trad.rlimit)
 136
 137 typedef struct cpp_context cpp_context;
 138 struct cpp_context
 139 {
 140   /* Doubly-linked list.  */
 141   cpp_context *next, *prev;
 142
 143   union
 144   {
 145     /* For ISO macro expansion.  Contexts other than the base context
 146        are contiguous tokens.  e.g. macro expansions, expanded
 147        argument tokens.  */
 148     struct
 149     {
 150       union utoken first;
 151       union utoken last;
 152     } iso;
 153
 154     /* For traditional macro expansion.  */
 155     struct
 156     {
 157       const unsigned char *cur;
 158       const unsigned char *rlimit;
 159     } trad;
 160   } u;
 161
 162   /* If non-NULL, a buffer used for storage related to this context.
 163      When the context is popped, the buffer is released.  */
 164   _cpp_buff *buff;
 165
 166   /* For a macro context, the macro node, otherwise NULL.  */
 167   cpp_hashnode *macro;
 168
 169   /* True if utoken element is token, else ptoken.  */
 170   bool direct_p;
 171 };
 172
 173 struct lexer_state
 174 {
 175   /* Nonzero if first token on line is CPP_HASH.  */
 176   unsigned char in_directive;
 177
 178   /* Nonzero if in a directive that will handle padding tokens itself.
 179      #include needs this to avoid problems with computed include and
 180      spacing between tokens.  */
 181   unsigned char directive_wants_padding;
 182
 183   /* True if we are skipping a failed conditional group.  */
 184   unsigned char skipping;
 185
 186   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 187   unsigned char angled_headers;
 188
 189   /* Nonzero if in a #if or #elif directive.  */
 190   unsigned char in_expression;
 191
 192   /* Nonzero to save comments.  Turned off if discard_comments, and in
 193      all directives apart from #define.  */
 194   unsigned char save_comments;
 195
 196   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 197   unsigned char va_args_ok;
 198
 199   /* Nonzero if lexing poisoned identifiers is valid.  */
 200   unsigned char poisoned_ok;
 201
 202   /* Nonzero to prevent macro expansion.  */
 203   unsigned char prevent_expansion;
 204
 205   /* Nonzero when parsing arguments to a function-like macro.  */
 206   unsigned char parsing_args;
 207
 208   /* Nonzero if prevent_expansion is true only because output is
 209      being discarded.  */
 210   unsigned char discarding_output;
 211
 212   /* Nonzero to skip evaluating part of an expression.  */
 213   unsigned int skip_eval;
 214
 215   /* Nonzero when handling a deferred pragma.  */
 216   unsigned char in_deferred_pragma;
 217
 218   /* Nonzero if the deferred pragma being handled allows macro expansion.  */
 219   unsigned char pragma_allow_expansion;
 220 };
 221
 222 /* Special nodes - identifiers with predefined significance.  */
 223 struct spec_nodes
 224 {
 225   cpp_hashnode *n_defined;              /* defined operator */
 226   cpp_hashnode *n_true;                 /* C++ keyword true */
 227   cpp_hashnode *n_false;                /* C++ keyword false */
 228   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 229 };
 230
 231 typedef struct _cpp_line_note _cpp_line_note;
 232 struct _cpp_line_note
 233 {
 234   /* Location in the clean line the note refers to.  */
 235   const unsigned char *pos;
 236
 237   /* Type of note.  The 9 'from' trigraph characters represent those
 238      trigraphs, '\\' an escaped newline, ' ' an escaped newline with
 239      intervening space, and anything else is invalid.  */
 240   unsigned int type;
 241 };
 242
 243 /* Represents the contents of a file cpplib has read in.  */
 244 struct cpp_buffer
 245 {
 246   const unsigned char *cur;        /* Current location.  */
 247   const unsigned char *line_base;  /* Start of current physical line.  */
 248   const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
 249
 250   const unsigned char *buf;        /* Entire character buffer.  */
 251   const unsigned char *rlimit;     /* Writable byte at end of file.  */
 252
 253   _cpp_line_note *notes;           /* Array of notes.  */
 254   unsigned int cur_note;           /* Next note to process.  */
 255   unsigned int notes_used;         /* Number of notes.  */
 256   unsigned int notes_cap;          /* Size of allocated array.  */
 257
 258   struct cpp_buffer *prev;
 259
 260   /* Pointer into the file table; non-NULL if this is a file buffer.
 261      Used for include_next and to record control macros.  */
 262   struct _cpp_file *file;
 263
 264   /* Saved value of __TIMESTAMP__ macro - date and time of last modification
 265      of the assotiated file.  */
 266   const unsigned char *timestamp;
 267
 268   /* Value of if_stack at start of this file.
 269      Used to prohibit unmatched #endif (etc) in an include file.  */
 270   struct if_stack *if_stack;
 271
 272   /* True if we need to get the next clean line.  */
 273   bool need_line;
 274
 275   /* True if we have already warned about C++ comments in this file.
 276      The warning happens only for C89 extended mode with -pedantic on,
 277      or for -Wtraditional, and only once per file (otherwise it would
 278      be far too noisy).  */
 279   unsigned int warned_cplusplus_comments : 1;
 280
 281   /* True if we don't process trigraphs and escaped newlines.  True
 282      for preprocessed input, command line directives, and _Pragma
 283      buffers.  */
 284   unsigned int from_stage3 : 1;
 285
 286   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 287      true, a CPP_EOF token is then returned.  Otherwise, the next
 288      token from the enclosing buffer is returned.  */
 289   unsigned int return_at_eof : 1;
 290
 291   /* One for a system header, two for a C system header file that therefore
 292      needs to be extern "C" protected in C++, and zero otherwise.  */
 293   unsigned char sysp;
 294
 295   /* The directory of the this buffer's file.  Its NAME member is not
 296      allocated, so we don't need to worry about freeing it.  */
 297   struct cpp_dir dir;
 298
 299   /* Descriptor for converting from the input character set to the
 300      source character set.  */
 301   struct cset_converter input_cset_desc;
 302 };
 303
 304 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 305    Applying cpp_get_token repeatedly yields a stream of pre-processor
 306    tokens.  Usually, there is only one cpp_reader object active.  */
 307 struct cpp_reader
 308 {
 309   /* Top of buffer stack.  */
 310   cpp_buffer *buffer;
 311
 312   /* Overlaid buffer (can be different after processing #include).  */
 313   cpp_buffer *overlaid_buffer;
 314
 315   /* Lexer state.  */
 316   struct lexer_state state;
 317
 318   /* Source line tracking.  */
 319   struct line_maps *line_table;
 320
 321   /* The line of the '#' of the current directive.  */
 322   source_location directive_line;
 323
 324   /* Memory buffers.  */
 325   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 326   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 327   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 328
 329   /* Context stack.  */
 330   struct cpp_context base_context;
 331   struct cpp_context *context;
 332
 333   /* If in_directive, the directive if known.  */
 334   const struct directive *directive;
 335
 336   /* Token generated while handling a directive, if any. */
 337   cpp_token directive_result;
 338
 339   /* When expanding a macro at top-level, this is the location of the
 340      macro invocation.  */
 341   source_location invocation_location;
 342
 343   /* True if this call to cpp_get_token should consider setting
 344      invocation_location.  */
 345   bool set_invocation_location;
 346
 347   /* Search paths for include files.  */
 348   struct cpp_dir *quote_include;        /* "" */
 349   struct cpp_dir *bracket_include;      /* <> */
 350   struct cpp_dir no_search_path;        /* No path.  */
 351
 352   /* Chain of all hashed _cpp_file instances.  */
 353   struct _cpp_file *all_files;
 354
 355   struct _cpp_file *main_file;
 356
 357   /* File and directory hash table.  */
 358   struct htab *file_hash;
 359   struct htab *dir_hash;
 360   struct file_hash_entry_pool *file_hash_entries;
 361
 362   /* Negative path lookup hash table.  */
 363   struct htab *nonexistent_file_hash;
 364   struct obstack nonexistent_file_ob;
 365
 366   /* Nonzero means don't look for #include "foo" the source-file
 367      directory.  */
 368   bool quote_ignores_source_dir;
 369
 370   /* Nonzero if any file has contained #pragma once or #import has
 371      been used.  */
 372   bool seen_once_only;
 373
 374   /* Multiple include optimization.  */
 375   const cpp_hashnode *mi_cmacro;
 376   const cpp_hashnode *mi_ind_cmacro;
 377   bool mi_valid;
 378
 379   /* Lexing.  */
 380   cpp_token *cur_token;
 381   tokenrun base_run, *cur_run;
 382   unsigned int lookaheads;
 383
 384   /* Nonzero prevents the lexer from re-using the token runs.  */
 385   unsigned int keep_tokens;
 386
 387   /* Buffer to hold macro definition string.  */
 388   unsigned char *macro_buffer;
 389   unsigned int macro_buffer_len;
 390
 391   /* Descriptor for converting from the source character set to the
 392      execution character set.  */
 393   struct cset_converter narrow_cset_desc;
 394
 395   /* Descriptor for converting from the source character set to the
 396      UTF-16 execution character set.  */
 397   struct cset_converter char16_cset_desc;
 398
 399   /* Descriptor for converting from the source character set to the
 400      UTF-32 execution character set.  */
 401   struct cset_converter char32_cset_desc;
 402
 403   /* Descriptor for converting from the source character set to the
 404      wide execution character set.  */
 405   struct cset_converter wide_cset_desc;
 406
 407   /* Date and time text.  Calculated together if either is requested.  */
 408   const unsigned char *date;
 409   const unsigned char *time;
 410
 411   /* EOF token, and a token forcing paste avoidance.  */
 412   cpp_token avoid_paste;
 413   cpp_token eof;
 414
 415   /* Opaque handle to the dependencies of mkdeps.c.  */
 416   struct deps *deps;
 417
 418   /* Obstack holding all macro hash nodes.  This never shrinks.
 419      See identifiers.c */
 420   struct obstack hash_ob;
 421
 422   /* Obstack holding buffer and conditional structures.  This is a
 423      real stack.  See directives.c.  */
 424   struct obstack buffer_ob;
 425
 426   /* Pragma table - dynamic, because a library user can add to the
 427      list of recognized pragmas.  */
 428   struct pragma_entry *pragmas;
 429
 430   /* Call backs to cpplib client.  */
 431   struct cpp_callbacks cb;
 432
 433   /* Identifier hash table.  */
 434   struct ht *hash_table;
 435
 436   /* Expression parser stack.  */
 437   struct op *op_stack, *op_limit;
 438
 439   /* User visible options.  */
 440   struct cpp_options opts;
 441
 442   /* Special nodes - identifiers with predefined significance to the
 443      preprocessor.  */
 444   struct spec_nodes spec_nodes;
 445
 446   /* Whether cpplib owns the hashtable.  */
 447   bool our_hashtable;
 448
 449   /* Traditional preprocessing output buffer (a logical line).  */
 450   struct
 451   {
 452     unsigned char *base;
 453     unsigned char *limit;
 454     unsigned char *cur;
 455     source_location first_line;
 456   } out;
 457
 458   /* Used for buffer overlays by traditional.c.  */
 459   const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
 460
 461   /* A saved list of the defined macros, for dependency checking
 462      of precompiled headers.  */
 463   struct cpp_savedstate *savedstate;
 464
 465   /* Next value of __COUNTER__ macro. */
 466   unsigned int counter;
 467
 468   /* Table of comments, when state.save_comments is true.  */
 469   cpp_comment_table comments;
 470 };
 471
 472 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 473    If the definition of `numchar' looks odd to you, please look up the
 474    definition of a pp-number in the C standard [section 6.4.8 of C99].
 475
 476    In the unlikely event that characters other than \r and \n enter
 477    the set is_vspace, the macro handle_newline() in lex.c must be
 478    updated.  */
 479 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 480
 481 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 482 #define is_numchar(x)   ISIDNUM(x)
 483 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 484 #define is_numstart(x)  ISDIGIT(x)
 485 #define is_hspace(x)    ISBLANK(x)
 486 #define is_vspace(x)    IS_VSPACE(x)
 487 #define is_nvspace(x)   IS_NVSPACE(x)
 488 #define is_space(x)     IS_SPACE_OR_NUL(x)
 489
 490 /* This table is constant if it can be initialized at compile time,
 491    which is the case if cpp was compiled with GCC >=2.7, or another
 492    compiler that supports C99.  */
 493 #if HAVE_DESIGNATED_INITIALIZERS
 494 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 495 #else
 496 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 497 #endif
 498
 499 /* Macros.  */
 500
 501 static inline int cpp_in_system_header (cpp_reader *);
 502 static inline int
 503 cpp_in_system_header (cpp_reader *pfile)
 504 {
 505   return pfile->buffer ? pfile->buffer->sysp : 0;
 506 }
 507 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
 508 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
 509
 510 static inline int cpp_in_primary_file (cpp_reader *);
 511 static inline int
 512 cpp_in_primary_file (cpp_reader *pfile)
 513 {
 514   return pfile->line_table->depth == 1;
 515 }
 516
 517 /* In macro.c */
 518 extern void _cpp_free_definition (cpp_hashnode *);
 519 extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
 520 extern void _cpp_pop_context (cpp_reader *);
 521 extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
 522                                     const unsigned char *, size_t);
 523 extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
 524 extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
 525                                unsigned int);
 526 extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
 527                                                      cpp_hashnode *);
 528 extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
 529 extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
 530                                      const cpp_token *, unsigned int);
 531 extern void _cpp_backup_tokens_direct (cpp_reader *, unsigned int);
 532
 533 /* In identifiers.c */
 534 extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
 535 extern void _cpp_destroy_hashtable (cpp_reader *);
 536
 537 /* In files.c */
 538 typedef struct _cpp_file _cpp_file;
 539 extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
 540                                   bool, int);
 541 extern bool _cpp_find_failed (_cpp_file *);
 542 extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
 543 extern void _cpp_fake_include (cpp_reader *, const char *);
 544 extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
 545 extern bool _cpp_stack_include (cpp_reader *, const char *, int,
 546                                 enum include_type);
 547 extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
 548 extern void _cpp_report_missing_guards (cpp_reader *);
 549 extern void _cpp_init_files (cpp_reader *);
 550 extern void _cpp_cleanup_files (cpp_reader *);
 551 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
 552 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 553 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
 554 extern struct stat *_cpp_get_file_stat (_cpp_file *);
 555
 556 /* In expr.c */
 557 extern bool _cpp_parse_expr (cpp_reader *, bool);
 558 extern struct op *_cpp_expand_op_stack (cpp_reader *);
 559
 560 /* In lex.c */
 561 extern void _cpp_process_line_notes (cpp_reader *, int);
 562 extern void _cpp_clean_line (cpp_reader *);
 563 extern bool _cpp_get_fresh_line (cpp_reader *);
 564 extern bool _cpp_skip_block_comment (cpp_reader *);
 565 extern cpp_token *_cpp_temp_token (cpp_reader *);
 566 extern const cpp_token *_cpp_lex_token (cpp_reader *);
 567 extern cpp_token *_cpp_lex_direct (cpp_reader *);
 568 extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
 569 extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
 570
 571 /* In init.c.  */
 572 extern void _cpp_maybe_push_include_file (cpp_reader *);
 573 extern const char *cpp_named_operator2name (enum cpp_ttype type);
 574
 575 /* In directives.c */
 576 extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
 577 extern int _cpp_handle_directive (cpp_reader *, int);
 578 extern void _cpp_define_builtin (cpp_reader *, const char *);
 579 extern char ** _cpp_save_pragma_names (cpp_reader *);
 580 extern void _cpp_restore_pragma_names (cpp_reader *, char **);
 581 extern int _cpp_do__Pragma (cpp_reader *);
 582 extern void _cpp_init_directives (cpp_reader *);
 583 extern void _cpp_init_internal_pragmas (cpp_reader *);
 584 extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
 585                                  linenum_type, unsigned int);
 586 extern void _cpp_pop_buffer (cpp_reader *);
 587
 588 /* In directives.c */
 589 struct _cpp_dir_only_callbacks
 590 {
 591   /* Called to print a block of lines. */
 592   void (*print_lines) (int, const void *, size_t);
 593   void (*maybe_print_line) (source_location);
 594 };
 595
 596 extern void _cpp_preprocess_dir_only (cpp_reader *,
 597                                       const struct _cpp_dir_only_callbacks *);
 598
 599 /* In traditional.c.  */
 600 extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
 601 extern bool _cpp_read_logical_line_trad (cpp_reader *);
 602 extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
 603                                  size_t);
 604 extern void _cpp_remove_overlay (cpp_reader *);
 605 extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
 606 extern bool _cpp_expansions_different_trad (const cpp_macro *,
 607                                             const cpp_macro *);
 608 extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
 609                                                   unsigned char *);
 610 extern size_t _cpp_replacement_text_len (const cpp_macro *);
 611
 612 /* In charset.c.  */
 613
 614 /* The normalization state at this point in the sequence.
 615    It starts initialized to all zeros, and at the end
 616    'level' is the normalization level of the sequence.  */
 617
 618 struct normalize_state
 619 {
 620   /* The previous character.  */
 621   cppchar_t previous;
 622   /* The combining class of the previous character.  */
 623   unsigned char prev_class;
 624   /* The lowest normalization level so far.  */
 625   enum cpp_normalize_level level;
 626 };
 627 #define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
 628 #define NORMALIZE_STATE_RESULT(st) ((st)->level)
 629
 630 /* We saw a character that matches ISIDNUM(), update a
 631    normalize_state appropriately.  */
 632 #define NORMALIZE_STATE_UPDATE_IDNUM(st) \
 633   ((st)->previous = 0, (st)->prev_class = 0)
 634
 635 extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
 636                                  const unsigned char *, int,
 637                                  struct normalize_state *state);
 638 extern void _cpp_destroy_iconv (cpp_reader *);
 639 extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
 640                                           unsigned char *, size_t, size_t,
 641                                           const unsigned char **, off_t *);
 642 extern const char *_cpp_default_encoding (void);
 643 extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
 644                                                  const unsigned char *id,
 645                                                  size_t len);
 646
 647 /* Utility routines and macros.  */
 648 #define DSC(str) (const unsigned char *)str, sizeof str - 1
 649
 650 /* These are inline functions instead of macros so we can get type
 651    checking.  */
 652 static inline int ustrcmp (const unsigned char *, const unsigned char *);
 653 static inline int ustrncmp (const unsigned char *, const unsigned char *,
 654                             size_t);
 655 static inline size_t ustrlen (const unsigned char *);
 656 static inline unsigned char *uxstrdup (const unsigned char *);
 657 static inline unsigned char *ustrchr (const unsigned char *, int);
 658 static inline int ufputs (const unsigned char *, FILE *);
 659
 660 /* Use a const char for the second parameter since it is usually a literal.  */
 661 static inline int ustrcspn (const unsigned char *, const char *);
 662
 663 static inline int
 664 ustrcmp (const unsigned char *s1, const unsigned char *s2)
 665 {
 666   return strcmp ((const char *)s1, (const char *)s2);
 667 }
 668
 669 static inline int
 670 ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
 671 {
 672   return strncmp ((const char *)s1, (const char *)s2, n);
 673 }
 674
 675 static inline int
 676 ustrcspn (const unsigned char *s1, const char *s2)
 677 {
 678   return strcspn ((const char *)s1, s2);
 679 }
 680
 681 static inline size_t
 682 ustrlen (const unsigned char *s1)
 683 {
 684   return strlen ((const char *)s1);
 685 }
 686
 687 static inline unsigned char *
 688 uxstrdup (const unsigned char *s1)
 689 {
 690   return (unsigned char *) xstrdup ((const char *)s1);
 691 }
 692
 693 static inline unsigned char *
 694 ustrchr (const unsigned char *s1, int c)
 695 {
 696   return (unsigned char *) strchr ((const char *)s1, c);
 697 }
 698
 699 static inline int
 700 ufputs (const unsigned char *s, FILE *f)
 701 {
 702   return fputs ((const char *)s, f);
 703 }
 704
 705 #endif /* ! LIBCPP_INTERNAL_H */