libcpp/internal.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
   3    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 2, 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; if not, write to the Free Software
  17 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  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 #ifndef HAVE_ICONV_H
  30 #undef HAVE_ICONV
  31 #endif
  32
  33 #if HAVE_ICONV
  34 #include <iconv.h>
  35 #else
  36 #define HAVE_ICONV 0
  37 typedef int iconv_t;  /* dummy */
  38 #endif
  39
  40 struct directive;               /* Deliberately incomplete.  */
  41 struct pending_option;
  42 struct op;
  43 struct _cpp_strbuf;
  44
  45 typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
  46                            struct _cpp_strbuf *);
  47 struct cset_converter
  48 {
  49   convert_f func;
  50   iconv_t cd;
  51   int width;
  52 };
  53
  54 #define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
  55
  56 /* Test if a sign is valid within a preprocessing number.  */
  57 #define VALID_SIGN(c, prevc) \
  58   (((c) == '+' || (c) == '-') && \
  59    ((prevc) == 'e' || (prevc) == 'E' \
  60     || (((prevc) == 'p' || (prevc) == 'P') \
  61         && CPP_OPTION (pfile, extended_numbers))))
  62
  63 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  64 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  65 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
  66 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  67
  68 #define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
  69     const struct line_maps *line_table = PFILE->line_table; \
  70     const struct line_map *map = &line_table->maps[line_table->used-1]; \
  71     unsigned int line = SOURCE_LINE (map, line_table->highest_line); \
  72     linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
  73   } while (0)
  74
  75 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  76    efficiency, and partly to limit runaway recursion.  */
  77 #define CPP_STACK_MAX 200
  78
  79 /* Host alignment handling.  */
  80 struct dummy
  81 {
  82   char c;
  83   union
  84   {
  85     double d;
  86     int *p;
  87   } u;
  88 };
  89
  90 #define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
  91 #define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
  92 #define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
  93
  94 #define _cpp_mark_macro_used(NODE) do {                                 \
  95   if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))      \
  96     (NODE)->value.macro->used = 1; } while (0)
  97
  98 /* A generic memory buffer, and operations on it.  */
  99 typedef struct _cpp_buff _cpp_buff;
 100 struct _cpp_buff
 101 {
 102   struct _cpp_buff *next;
 103   unsigned char *base, *cur, *limit;
 104 };
 105
 106 extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
 107 extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
 108 extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
 109 extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
 110 extern void _cpp_free_buff (_cpp_buff *);
 111 extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
 112 extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
 113
 114 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
 115 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
 116 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
 117
 118 /* #include types.  */
 119 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
 120
 121 union utoken
 122 {
 123   const cpp_token *token;
 124   const cpp_token **ptoken;
 125 };
 126
 127 /* A "run" of tokens; part of a chain of runs.  */
 128 typedef struct tokenrun tokenrun;
 129 struct tokenrun
 130 {
 131   tokenrun *next, *prev;
 132   cpp_token *base, *limit;
 133 };
 134
 135 /* Accessor macros for struct cpp_context.  */
 136 #define FIRST(c) ((c)->u.iso.first)
 137 #define LAST(c) ((c)->u.iso.last)
 138 #define CUR(c) ((c)->u.trad.cur)
 139 #define RLIMIT(c) ((c)->u.trad.rlimit)
 140
 141 typedef struct cpp_context cpp_context;
 142 struct cpp_context
 143 {
 144   /* Doubly-linked list.  */
 145   cpp_context *next, *prev;
 146
 147   union
 148   {
 149     /* For ISO macro expansion.  Contexts other than the base context
 150        are contiguous tokens.  e.g. macro expansions, expanded
 151        argument tokens.  */
 152     struct
 153     {
 154       union utoken first;
 155       union utoken last;
 156     } iso;
 157
 158     /* For traditional macro expansion.  */
 159     struct
 160     {
 161       const unsigned char *cur;
 162       const unsigned char *rlimit;
 163     } trad;
 164   } u;
 165
 166   /* If non-NULL, a buffer used for storage related to this context.
 167      When the context is popped, the buffer is released.  */
 168   _cpp_buff *buff;
 169
 170   /* For a macro context, the macro node, otherwise NULL.  */
 171   cpp_hashnode *macro;
 172
 173   /* True if utoken element is token, else ptoken.  */
 174   bool direct_p;
 175 };
 176
 177 struct lexer_state
 178 {
 179   /* Nonzero if first token on line is CPP_HASH.  */
 180   unsigned char in_directive;
 181
 182   /* Nonzero if in a directive that will handle padding tokens itself.
 183      #include needs this to avoid problems with computed include and
 184      spacing between tokens.  */
 185   unsigned char directive_wants_padding;
 186
 187   /* True if we are skipping a failed conditional group.  */
 188   unsigned char skipping;
 189
 190   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 191   unsigned char angled_headers;
 192
 193   /* Nonzero if in a #if or #elif directive.  */
 194   unsigned char in_expression;
 195
 196   /* Nonzero to save comments.  Turned off if discard_comments, and in
 197      all directives apart from #define.  */
 198   unsigned char save_comments;
 199
 200   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 201   unsigned char va_args_ok;
 202
 203   /* Nonzero if lexing poisoned identifiers is valid.  */
 204   unsigned char poisoned_ok;
 205
 206   /* Nonzero to prevent macro expansion.  */
 207   unsigned char prevent_expansion;
 208
 209   /* Nonzero when parsing arguments to a function-like macro.  */
 210   unsigned char parsing_args;
 211
 212   /* Nonzero if prevent_expansion is true only because output is
 213      being discarded.  */
 214   unsigned char discarding_output;
 215
 216   /* Nonzero to skip evaluating part of an expression.  */
 217   unsigned int skip_eval;
 218
 219   /* Nonzero when handling a deferred pragma.  */
 220   unsigned char in_deferred_pragma;
 221
 222   /* Nonzero if the deferred pragma being handled allows macro expansion.  */
 223   unsigned char pragma_allow_expansion;
 224 };
 225
 226 /* Special nodes - identifiers with predefined significance.  */
 227 struct spec_nodes
 228 {
 229   cpp_hashnode *n_defined;              /* defined operator */
 230   cpp_hashnode *n_true;                 /* C++ keyword true */
 231   cpp_hashnode *n_false;                /* C++ keyword false */
 232   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 233 };
 234
 235 typedef struct _cpp_line_note _cpp_line_note;
 236 struct _cpp_line_note
 237 {
 238   /* Location in the clean line the note refers to.  */
 239   const unsigned char *pos;
 240
 241   /* Type of note.  The 9 'from' trigraph characters represent those
 242      trigraphs, '\\' an escaped newline, ' ' an escaped newline with
 243      intervening space, and anything else is invalid.  */
 244   unsigned int type;
 245 };
 246
 247 /* Represents the contents of a file cpplib has read in.  */
 248 struct cpp_buffer
 249 {
 250   const unsigned char *cur;        /* Current location.  */
 251   const unsigned char *line_base;  /* Start of current physical line.  */
 252   const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
 253
 254   const unsigned char *buf;        /* Entire character buffer.  */
 255   const unsigned char *rlimit;     /* Writable byte at end of file.  */
 256
 257   _cpp_line_note *notes;           /* Array of notes.  */
 258   unsigned int cur_note;           /* Next note to process.  */
 259   unsigned int notes_used;         /* Number of notes.  */
 260   unsigned int notes_cap;          /* Size of allocated array.  */
 261
 262   struct cpp_buffer *prev;
 263
 264   /* Pointer into the file table; non-NULL if this is a file buffer.
 265      Used for include_next and to record control macros.  */
 266   struct _cpp_file *file;
 267
 268   /* Saved value of __TIMESTAMP__ macro - date and time of last modification
 269      of the assotiated file.  */
 270   const unsigned char *timestamp;
 271
 272   /* Value of if_stack at start of this file.
 273      Used to prohibit unmatched #endif (etc) in an include file.  */
 274   struct if_stack *if_stack;
 275
 276   /* True if we need to get the next clean line.  */
 277   bool need_line;
 278
 279   /* True if we have already warned about C++ comments in this file.
 280      The warning happens only for C89 extended mode with -pedantic on,
 281      or for -Wtraditional, and only once per file (otherwise it would
 282      be far too noisy).  */
 283   unsigned int warned_cplusplus_comments : 1;
 284
 285   /* True if we don't process trigraphs and escaped newlines.  True
 286      for preprocessed input, command line directives, and _Pragma
 287      buffers.  */
 288   unsigned int from_stage3 : 1;
 289
 290   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 291      true, a CPP_EOF token is then returned.  Otherwise, the next
 292      token from the enclosing buffer is returned.  */
 293   unsigned int return_at_eof : 1;
 294
 295   /* One for a system header, two for a C system header file that therefore
 296      needs to be extern "C" protected in C++, and zero otherwise.  */
 297   unsigned char sysp;
 298
 299   /* The directory of the this buffer's file.  Its NAME member is not
 300      allocated, so we don't need to worry about freeing it.  */
 301   struct cpp_dir dir;
 302
 303   /* Descriptor for converting from the input character set to the
 304      source character set.  */
 305   struct cset_converter input_cset_desc;
 306 };
 307
 308 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 309    Applying cpp_get_token repeatedly yields a stream of pre-processor
 310    tokens.  Usually, there is only one cpp_reader object active.  */
 311 struct cpp_reader
 312 {
 313   /* Top of buffer stack.  */
 314   cpp_buffer *buffer;
 315
 316   /* Overlaid buffer (can be different after processing #include).  */
 317   cpp_buffer *overlaid_buffer;
 318
 319   /* Lexer state.  */
 320   struct lexer_state state;
 321
 322   /* Source line tracking.  */
 323   struct line_maps *line_table;
 324
 325   /* The line of the '#' of the current directive.  */
 326   source_location directive_line;
 327
 328   /* Memory buffers.  */
 329   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 330   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 331   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 332
 333   /* Context stack.  */
 334   struct cpp_context base_context;
 335   struct cpp_context *context;
 336
 337   /* If in_directive, the directive if known.  */
 338   const struct directive *directive;
 339
 340   /* Token generated while handling a directive, if any. */
 341   cpp_token directive_result;
 342
 343   /* When expanding a macro at top-level, this is the location of the
 344      macro invocation.  */
 345   source_location invocation_location;
 346
 347   /* True if this call to cpp_get_token should consider setting
 348      invocation_location.  */
 349   bool set_invocation_location;
 350
 351   /* Search paths for include files.  */
 352   struct cpp_dir *quote_include;        /* "" */
 353   struct cpp_dir *bracket_include;      /* <> */
 354   struct cpp_dir no_search_path;        /* No path.  */
 355
 356   /* Chain of all hashed _cpp_file instances.  */
 357   struct _cpp_file *all_files;
 358
 359   struct _cpp_file *main_file;
 360
 361   /* File and directory hash table.  */
 362   struct htab *file_hash;
 363   struct htab *dir_hash;
 364   struct file_hash_entry_pool *file_hash_entries;
 365
 366   /* Negative path lookup hash table.  */
 367   struct htab *nonexistent_file_hash;
 368   struct obstack nonexistent_file_ob;
 369
 370   /* Nonzero means don't look for #include "foo" the source-file
 371      directory.  */
 372   bool quote_ignores_source_dir;
 373
 374   /* Nonzero if any file has contained #pragma once or #import has
 375      been used.  */
 376   bool seen_once_only;
 377
 378   /* Multiple include optimization.  */
 379   const cpp_hashnode *mi_cmacro;
 380   const cpp_hashnode *mi_ind_cmacro;
 381   bool mi_valid;
 382
 383   /* Lexing.  */
 384   cpp_token *cur_token;
 385   tokenrun base_run, *cur_run;
 386   unsigned int lookaheads;
 387
 388   /* Nonzero prevents the lexer from re-using the token runs.  */
 389   unsigned int keep_tokens;
 390
 391   /* Error counter for exit code.  */
 392   unsigned int errors;
 393
 394   /* Buffer to hold macro definition string.  */
 395   unsigned char *macro_buffer;
 396   unsigned int macro_buffer_len;
 397
 398   /* Descriptor for converting from the source character set to the
 399      execution character set.  */
 400   struct cset_converter narrow_cset_desc;
 401
 402   /* Descriptor for converting from the source character set to the
 403      UTF-16 execution character set.  */
 404   struct cset_converter char16_cset_desc;
 405
 406   /* Descriptor for converting from the source character set to the
 407      UTF-32 execution character set.  */
 408   struct cset_converter char32_cset_desc;
 409
 410   /* Descriptor for converting from the source character set to the
 411      wide execution character set.  */
 412   struct cset_converter wide_cset_desc;
 413
 414   /* Date and time text.  Calculated together if either is requested.  */
 415   const unsigned char *date;
 416   const unsigned char *time;
 417
 418   /* EOF token, and a token forcing paste avoidance.  */
 419   cpp_token avoid_paste;
 420   cpp_token eof;
 421
 422   /* Opaque handle to the dependencies of mkdeps.c.  */
 423   struct deps *deps;
 424
 425   /* Obstack holding all macro hash nodes.  This never shrinks.
 426      See identifiers.c */
 427   struct obstack hash_ob;
 428
 429   /* Obstack holding buffer and conditional structures.  This is a
 430      real stack.  See directives.c.  */
 431   struct obstack buffer_ob;
 432
 433   /* Pragma table - dynamic, because a library user can add to the
 434      list of recognized pragmas.  */
 435   struct pragma_entry *pragmas;
 436
 437   /* Call backs to cpplib client.  */
 438   struct cpp_callbacks cb;
 439
 440   /* Identifier hash table.  */
 441   struct ht *hash_table;
 442
 443   /* Expression parser stack.  */
 444   struct op *op_stack, *op_limit;
 445
 446   /* User visible options.  */
 447   struct cpp_options opts;
 448
 449   /* Special nodes - identifiers with predefined significance to the
 450      preprocessor.  */
 451   struct spec_nodes spec_nodes;
 452
 453   /* Whether cpplib owns the hashtable.  */
 454   bool our_hashtable;
 455
 456   /* Traditional preprocessing output buffer (a logical line).  */
 457   struct
 458   {
 459     unsigned char *base;
 460     unsigned char *limit;
 461     unsigned char *cur;
 462     source_location first_line;
 463   } out;
 464
 465   /* Used for buffer overlays by traditional.c.  */
 466   const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
 467
 468   /* A saved list of the defined macros, for dependency checking
 469      of precompiled headers.  */
 470   struct cpp_savedstate *savedstate;
 471
 472   /* Next value of __COUNTER__ macro. */
 473   unsigned int counter;
 474 };
 475
 476 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 477    If the definition of `numchar' looks odd to you, please look up the
 478    definition of a pp-number in the C standard [section 6.4.8 of C99].
 479
 480    In the unlikely event that characters other than \r and \n enter
 481    the set is_vspace, the macro handle_newline() in lex.c must be
 482    updated.  */
 483 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 484
 485 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 486 #define is_numchar(x)   ISIDNUM(x)
 487 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 488 #define is_numstart(x)  ISDIGIT(x)
 489 #define is_hspace(x)    ISBLANK(x)
 490 #define is_vspace(x)    IS_VSPACE(x)
 491 #define is_nvspace(x)   IS_NVSPACE(x)
 492 #define is_space(x)     IS_SPACE_OR_NUL(x)
 493
 494 /* This table is constant if it can be initialized at compile time,
 495    which is the case if cpp was compiled with GCC >=2.7, or another
 496    compiler that supports C99.  */
 497 #if HAVE_DESIGNATED_INITIALIZERS
 498 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 499 #else
 500 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 501 #endif
 502
 503 /* Macros.  */
 504
 505 static inline int cpp_in_system_header (cpp_reader *);
 506 static inline int
 507 cpp_in_system_header (cpp_reader *pfile)
 508 {
 509   return pfile->buffer ? pfile->buffer->sysp : 0;
 510 }
 511 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
 512 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
 513
 514 static inline int cpp_in_primary_file (cpp_reader *);
 515 static inline int
 516 cpp_in_primary_file (cpp_reader *pfile)
 517 {
 518   return pfile->line_table->depth == 1;
 519 }
 520
 521 /* In macro.c */
 522 extern void _cpp_free_definition (cpp_hashnode *);
 523 extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
 524 extern void _cpp_pop_context (cpp_reader *);
 525 extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
 526                                     const unsigned char *, size_t);
 527 extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
 528 extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
 529                                unsigned int);
 530 extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
 531                                                      cpp_hashnode *);
 532 extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
 533 extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
 534                                      const cpp_token *, unsigned int);
 535
 536 /* In identifiers.c */
 537 extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
 538 extern void _cpp_destroy_hashtable (cpp_reader *);
 539
 540 /* In files.c */
 541 typedef struct _cpp_file _cpp_file;
 542 extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
 543                                   bool, int);
 544 extern bool _cpp_find_failed (_cpp_file *);
 545 extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
 546 extern void _cpp_fake_include (cpp_reader *, const char *);
 547 extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
 548 extern bool _cpp_stack_include (cpp_reader *, const char *, int,
 549                                 enum include_type);
 550 extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
 551 extern void _cpp_report_missing_guards (cpp_reader *);
 552 extern void _cpp_init_files (cpp_reader *);
 553 extern void _cpp_cleanup_files (cpp_reader *);
 554 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
 555 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 556 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
 557 extern struct stat *_cpp_get_file_stat (_cpp_file *);
 558
 559 /* In expr.c */
 560 extern bool _cpp_parse_expr (cpp_reader *, bool);
 561 extern struct op *_cpp_expand_op_stack (cpp_reader *);
 562
 563 /* In lex.c */
 564 extern void _cpp_process_line_notes (cpp_reader *, int);
 565 extern void _cpp_clean_line (cpp_reader *);
 566 extern bool _cpp_get_fresh_line (cpp_reader *);
 567 extern bool _cpp_skip_block_comment (cpp_reader *);
 568 extern cpp_token *_cpp_temp_token (cpp_reader *);
 569 extern const cpp_token *_cpp_lex_token (cpp_reader *);
 570 extern cpp_token *_cpp_lex_direct (cpp_reader *);
 571 extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
 572 extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
 573
 574 /* In init.c.  */
 575 extern void _cpp_maybe_push_include_file (cpp_reader *);
 576
 577 /* In directives.c */
 578 extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
 579 extern int _cpp_handle_directive (cpp_reader *, int);
 580 extern void _cpp_define_builtin (cpp_reader *, const char *);
 581 extern char ** _cpp_save_pragma_names (cpp_reader *);
 582 extern void _cpp_restore_pragma_names (cpp_reader *, char **);
 583 extern int _cpp_do__Pragma (cpp_reader *);
 584 extern void _cpp_init_directives (cpp_reader *);
 585 extern void _cpp_init_internal_pragmas (cpp_reader *);
 586 extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
 587                                  unsigned int, unsigned int);
 588 extern void _cpp_pop_buffer (cpp_reader *);
 589
 590 /* In directives.c */
 591 struct _cpp_dir_only_callbacks
 592 {
 593   /* Called to print a block of lines. */
 594   void (*print_lines) (int, const void *, size_t);
 595   void (*maybe_print_line) (source_location);
 596 };
 597
 598 extern void _cpp_preprocess_dir_only (cpp_reader *,
 599                                       const struct _cpp_dir_only_callbacks *);
 600
 601 /* In traditional.c.  */
 602 extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
 603 extern bool _cpp_read_logical_line_trad (cpp_reader *);
 604 extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
 605                                  size_t);
 606 extern void _cpp_remove_overlay (cpp_reader *);
 607 extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
 608 extern bool _cpp_expansions_different_trad (const cpp_macro *,
 609                                             const cpp_macro *);
 610 extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
 611                                                   unsigned char *);
 612 extern size_t _cpp_replacement_text_len (const cpp_macro *);
 613
 614 /* In charset.c.  */
 615
 616 /* The normalization state at this point in the sequence.
 617    It starts initialized to all zeros, and at the end
 618    'level' is the normalization level of the sequence.  */
 619
 620 struct normalize_state
 621 {
 622   /* The previous character.  */
 623   cppchar_t previous;
 624   /* The combining class of the previous character.  */
 625   unsigned char prev_class;
 626   /* The lowest normalization level so far.  */
 627   enum cpp_normalize_level level;
 628 };
 629 #define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
 630 #define NORMALIZE_STATE_RESULT(st) ((st)->level)
 631
 632 /* We saw a character that matches ISIDNUM(), update a
 633    normalize_state appropriately.  */
 634 #define NORMALIZE_STATE_UPDATE_IDNUM(st) \
 635   ((st)->previous = 0, (st)->prev_class = 0)
 636
 637 extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
 638                                  const unsigned char *, int,
 639                                  struct normalize_state *state);
 640 extern void _cpp_destroy_iconv (cpp_reader *);
 641 extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
 642                                           unsigned char *, size_t, size_t,
 643                                           const unsigned char **, off_t *);
 644 extern const char *_cpp_default_encoding (void);
 645 extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
 646                                                  const unsigned char *id,
 647                                                  size_t len);
 648
 649 /* Utility routines and macros.  */
 650 #define DSC(str) (const unsigned char *)str, sizeof str - 1
 651
 652 /* These are inline functions instead of macros so we can get type
 653    checking.  */
 654 static inline int ustrcmp (const unsigned char *, const unsigned char *);
 655 static inline int ustrncmp (const unsigned char *, const unsigned char *,
 656                             size_t);
 657 static inline size_t ustrlen (const unsigned char *);
 658 static inline unsigned char *uxstrdup (const unsigned char *);
 659 static inline unsigned char *ustrchr (const unsigned char *, int);
 660 static inline int ufputs (const unsigned char *, FILE *);
 661
 662 /* Use a const char for the second parameter since it is usually a literal.  */
 663 static inline int ustrcspn (const unsigned char *, const char *);
 664
 665 static inline int
 666 ustrcmp (const unsigned char *s1, const unsigned char *s2)
 667 {
 668   return strcmp ((const char *)s1, (const char *)s2);
 669 }
 670
 671 static inline int
 672 ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
 673 {
 674   return strncmp ((const char *)s1, (const char *)s2, n);
 675 }
 676
 677 static inline int
 678 ustrcspn (const unsigned char *s1, const char *s2)
 679 {
 680   return strcspn ((const char *)s1, s2);
 681 }
 682
 683 static inline size_t
 684 ustrlen (const unsigned char *s1)
 685 {
 686   return strlen ((const char *)s1);
 687 }
 688
 689 static inline unsigned char *
 690 uxstrdup (const unsigned char *s1)
 691 {
 692   return (unsigned char *) xstrdup ((const char *)s1);
 693 }
 694
 695 static inline unsigned char *
 696 ustrchr (const unsigned char *s1, int c)
 697 {
 698   return (unsigned char *) strchr ((const char *)s1, c);
 699 }
 700
 701 static inline int
 702 ufputs (const unsigned char *s, FILE *f)
 703 {
 704   return fputs ((const char *)s, f);
 705 }
 706
 707 #endif /* ! LIBCPP_INTERNAL_H */