libcpp/internal.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
   3    2008, 2009, 2010 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 #ifdef __cplusplus
  37 extern "C" {
  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     linenum_type 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 union utoken
 119 {
 120   const cpp_token *token;
 121   const cpp_token **ptoken;
 122 };
 123
 124 /* A "run" of tokens; part of a chain of runs.  */
 125 typedef struct tokenrun tokenrun;
 126 struct tokenrun
 127 {
 128   tokenrun *next, *prev;
 129   cpp_token *base, *limit;
 130 };
 131
 132 /* Accessor macros for struct cpp_context.  */
 133 #define FIRST(c) ((c)->u.iso.first)
 134 #define LAST(c) ((c)->u.iso.last)
 135 #define CUR(c) ((c)->u.trad.cur)
 136 #define RLIMIT(c) ((c)->u.trad.rlimit)
 137
 138 typedef struct cpp_context cpp_context;
 139 struct cpp_context
 140 {
 141   /* Doubly-linked list.  */
 142   cpp_context *next, *prev;
 143
 144   union
 145   {
 146     /* For ISO macro expansion.  Contexts other than the base context
 147        are contiguous tokens.  e.g. macro expansions, expanded
 148        argument tokens.  */
 149     struct
 150     {
 151       union utoken first;
 152       union utoken last;
 153     } iso;
 154
 155     /* For traditional macro expansion.  */
 156     struct
 157     {
 158       const unsigned char *cur;
 159       const unsigned char *rlimit;
 160     } trad;
 161   } u;
 162
 163   /* If non-NULL, a buffer used for storage related to this context.
 164      When the context is popped, the buffer is released.  */
 165   _cpp_buff *buff;
 166
 167   /* For a macro context, the macro node, otherwise NULL.  */
 168   cpp_hashnode *macro;
 169
 170   /* True if utoken element is token, else ptoken.  */
 171   bool direct_p;
 172 };
 173
 174 struct lexer_state
 175 {
 176   /* Nonzero if first token on line is CPP_HASH.  */
 177   unsigned char in_directive;
 178
 179   /* Nonzero if in a directive that will handle padding tokens itself.
 180      #include needs this to avoid problems with computed include and
 181      spacing between tokens.  */
 182   unsigned char directive_wants_padding;
 183
 184   /* True if we are skipping a failed conditional group.  */
 185   unsigned char skipping;
 186
 187   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 188   unsigned char angled_headers;
 189
 190   /* Nonzero if in a #if or #elif directive.  */
 191   unsigned char in_expression;
 192
 193   /* Nonzero to save comments.  Turned off if discard_comments, and in
 194      all directives apart from #define.  */
 195   unsigned char save_comments;
 196
 197   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 198   unsigned char va_args_ok;
 199
 200   /* Nonzero if lexing poisoned identifiers is valid.  */
 201   unsigned char poisoned_ok;
 202
 203   /* Nonzero to prevent macro expansion.  */
 204   unsigned char prevent_expansion;
 205
 206   /* Nonzero when parsing arguments to a function-like macro.  */
 207   unsigned char parsing_args;
 208
 209   /* Nonzero if prevent_expansion is true only because output is
 210      being discarded.  */
 211   unsigned char discarding_output;
 212
 213   /* Nonzero to skip evaluating part of an expression.  */
 214   unsigned int skip_eval;
 215
 216   /* Nonzero when handling a deferred pragma.  */
 217   unsigned char in_deferred_pragma;
 218
 219   /* Nonzero if the deferred pragma being handled allows macro expansion.  */
 220   unsigned char pragma_allow_expansion;
 221 };
 222
 223 /* Special nodes - identifiers with predefined significance.  */
 224 struct spec_nodes
 225 {
 226   cpp_hashnode *n_defined;              /* defined operator */
 227   cpp_hashnode *n_true;                 /* C++ keyword true */
 228   cpp_hashnode *n_false;                /* C++ keyword false */
 229   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 230 };
 231
 232 typedef struct _cpp_line_note _cpp_line_note;
 233 struct _cpp_line_note
 234 {
 235   /* Location in the clean line the note refers to.  */
 236   const unsigned char *pos;
 237
 238   /* Type of note.  The 9 'from' trigraph characters represent those
 239      trigraphs, '\\' an escaped newline, ' ' an escaped newline with
 240      intervening space, 0 represents a note that has already been handled,
 241      and anything else is invalid.  */
 242   unsigned int type;
 243 };
 244
 245 /* Represents the contents of a file cpplib has read in.  */
 246 struct cpp_buffer
 247 {
 248   const unsigned char *cur;        /* Current location.  */
 249   const unsigned char *line_base;  /* Start of current physical line.  */
 250   const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
 251
 252   const unsigned char *buf;        /* Entire character buffer.  */
 253   const unsigned char *rlimit;     /* Writable byte at end of file.  */
 254
 255   _cpp_line_note *notes;           /* Array of notes.  */
 256   unsigned int cur_note;           /* Next note to process.  */
 257   unsigned int notes_used;         /* Number of notes.  */
 258   unsigned int notes_cap;          /* Size of allocated array.  */
 259
 260   struct cpp_buffer *prev;
 261
 262   /* Pointer into the file table; non-NULL if this is a file buffer.
 263      Used for include_next and to record control macros.  */
 264   struct _cpp_file *file;
 265
 266   /* Saved value of __TIMESTAMP__ macro - date and time of last modification
 267      of the assotiated file.  */
 268   const unsigned char *timestamp;
 269
 270   /* Value of if_stack at start of this file.
 271      Used to prohibit unmatched #endif (etc) in an include file.  */
 272   struct if_stack *if_stack;
 273
 274   /* True if we need to get the next clean line.  */
 275   bool need_line;
 276
 277   /* True if we have already warned about C++ comments in this file.
 278      The warning happens only for C89 extended mode with -pedantic on,
 279      or for -Wtraditional, and only once per file (otherwise it would
 280      be far too noisy).  */
 281   unsigned int warned_cplusplus_comments : 1;
 282
 283   /* True if we don't process trigraphs and escaped newlines.  True
 284      for preprocessed input, command line directives, and _Pragma
 285      buffers.  */
 286   unsigned int from_stage3 : 1;
 287
 288   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 289      true, a CPP_EOF token is then returned.  Otherwise, the next
 290      token from the enclosing buffer is returned.  */
 291   unsigned int return_at_eof : 1;
 292
 293   /* One for a system header, two for a C system header file that therefore
 294      needs to be extern "C" protected in C++, and zero otherwise.  */
 295   unsigned char sysp;
 296
 297   /* The directory of the this buffer's file.  Its NAME member is not
 298      allocated, so we don't need to worry about freeing it.  */
 299   struct cpp_dir dir;
 300
 301   /* Descriptor for converting from the input character set to the
 302      source character set.  */
 303   struct cset_converter input_cset_desc;
 304 };
 305
 306 /* The list of saved macros by push_macro pragma.  */
 307 struct def_pragma_macro {
 308   /* Chain element to previous saved macro.  */
 309   struct def_pragma_macro *next;
 310   /* Name of the macro.  */
 311   char *name;
 312   /* The stored macro content.  */
 313   unsigned char *definition;
 314
 315   /* Definition line number.  */
 316   source_location line;
 317   /* If macro defined in system header.  */
 318   unsigned int syshdr   : 1;
 319   /* Nonzero if it has been expanded or had its existence tested.  */
 320   unsigned int used     : 1;
 321
 322   /* Mark if we save an undefined macro.  */
 323   unsigned int is_undef : 1;
 324 };
 325
 326
 327 /* A lookaside identifier table for subsets of the token stream.  */
 328
 329 /* The lookaside entry.  */
 330 struct lae {
 331   hashnode node;                /* The entry in hash_table.  */
 332   unsigned int hash;            /* Hash value.  */
 333   unsigned int length;          /* Macro value length.  */
 334   const char *value;            /* Macro value string.  */
 335 };
 336
 337 /* The lookaside table.  */
 338 struct cpp_lookaside {
 339   struct lae *entries;          /* The entry storage.  */
 340   unsigned int order;           /* 2^order slots in the entries array.  */
 341   unsigned int sticky_order;    /* For resizing when capturing the entries.  */
 342   unsigned int active;          /* Number of active entries.  */
 343   struct obstack *strings;      /* For macro value storage.  */
 344   unsigned int max_ident_len;   /* Largest identifier encountered.  */
 345   unsigned int max_value_len;   /* Largest macro value encountered.  */
 346
 347   /* Table usage statistics.  */
 348   unsigned long long searches;          /* Number of calls to lt_lookup.  */
 349   unsigned long long comparisons;       /* Key comparisons.  */
 350   unsigned long long strcmps;           /* Key comparisons using strcmp.  */
 351   unsigned long long collisions;        /* Found unwanted hash or key.  */
 352   unsigned long long misses;            /* Searches not found in table.  */
 353   unsigned long long insertions;        /* Number insertions in table.  */
 354   unsigned long long macrovalue;        /* Number of macro values computed.  */
 355   unsigned long long resizes;           /* Had to resize (grow) the table.  */
 356   unsigned long long bumps;             /* Collisions in the resize process.  */
 357   unsigned long long iterations;        /* Cells iterated over table.  */
 358   unsigned long long empties;           /* Number of table empty/capture.  */
 359
 360   /* Table debugging.  */
 361   unsigned int pth_debug_level;
 362 };
 363
 364 /* Lookup an identifer in the lookaside table,
 365    and failing that, lookup in the main hash table.
 366    The return will always be non-null.  */
 367 cpp_hashnode *
 368 lt_lookup (cpp_reader *pfile,
 369            const unsigned char *identifier,
 370            size_t length,
 371            unsigned int hash);
 372
 373 /* The hash parameter is obtained with the following function,
 374    or with the HT_... macros in include/symtab.h. */
 375 unsigned int
 376 ht_calc_hash (const unsigned char *str, size_t len);
 377
 378
 379 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 380    Applying cpp_get_token repeatedly yields a stream of pre-processor
 381    tokens.  Usually, there is only one cpp_reader object active.  */
 382 struct cpp_reader
 383 {
 384   /* Top of buffer stack.  */
 385   cpp_buffer *buffer;
 386
 387   /* Overlaid buffer (can be different after processing #include).  */
 388   cpp_buffer *overlaid_buffer;
 389
 390   /* Lexer state.  */
 391   struct lexer_state state;
 392
 393   /* Source line tracking.  */
 394   struct line_maps *line_table;
 395
 396   /* The line of the '#' of the current directive.  */
 397   source_location directive_line;
 398
 399   /* Memory buffers.  */
 400   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 401   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 402   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 403
 404   /* Context stack.  */
 405   struct cpp_context base_context;
 406   struct cpp_context *context;
 407
 408   /* If in_directive, the directive if known.  */
 409   const struct directive *directive;
 410
 411   /* Token generated while handling a directive, if any. */
 412   cpp_token directive_result;
 413
 414   /* When expanding a macro at top-level, this is the location of the
 415      macro invocation.  */
 416   source_location invocation_location;
 417
 418   /* True if this call to cpp_get_token should consider setting
 419      invocation_location.  */
 420   bool set_invocation_location;
 421
 422   /* Search paths for include files.  */
 423   struct cpp_dir *quote_include;        /* "" */
 424   struct cpp_dir *bracket_include;      /* <> */
 425   struct cpp_dir no_search_path;        /* No path.  */
 426
 427   /* Chain of all hashed _cpp_file instances.  */
 428   struct _cpp_file *all_files;
 429
 430   struct _cpp_file *main_file;
 431
 432   /* File and directory hash table.  */
 433   struct htab *file_hash;
 434   struct htab *dir_hash;
 435   struct file_hash_entry_pool *file_hash_entries;
 436
 437   /* Negative path lookup hash table.  */
 438   struct htab *nonexistent_file_hash;
 439   struct obstack nonexistent_file_ob;
 440
 441   /* Nonzero means don't look for #include "foo" the source-file
 442      directory.  */
 443   bool quote_ignores_source_dir;
 444
 445   /* Nonzero if any file has contained #pragma once or #import has
 446      been used.  */
 447   bool seen_once_only;
 448
 449   /* Multiple include optimization.  */
 450   const cpp_hashnode *mi_cmacro;
 451   const cpp_hashnode *mi_ind_cmacro;
 452   bool mi_valid;
 453
 454   /* Lexing.  */
 455   cpp_token *cur_token;
 456   tokenrun base_run, *cur_run;
 457   unsigned int lookaheads;
 458
 459   /* Nonzero prevents the lexer from re-using the token runs.  */
 460   unsigned int keep_tokens;
 461
 462   /* Buffer to hold macro definition string.  */
 463   unsigned char *macro_buffer;
 464   unsigned int macro_buffer_len;
 465
 466   /* Buffer to save parameter values during macro parameter processing.  */
 467   union _cpp_hashnode_value *param_buffer;
 468   unsigned int param_buffer_len;
 469
 470   /* Descriptor for converting from the source character set to the
 471      execution character set.  */
 472   struct cset_converter narrow_cset_desc;
 473
 474   /* Descriptor for converting from the source character set to the
 475      UTF-8 execution character set.  */
 476   struct cset_converter utf8_cset_desc;
 477
 478   /* Descriptor for converting from the source character set to the
 479      UTF-16 execution character set.  */
 480   struct cset_converter char16_cset_desc;
 481
 482   /* Descriptor for converting from the source character set to the
 483      UTF-32 execution character set.  */
 484   struct cset_converter char32_cset_desc;
 485
 486   /* Descriptor for converting from the source character set to the
 487      wide execution character set.  */
 488   struct cset_converter wide_cset_desc;
 489
 490   /* Date and time text.  Calculated together if either is requested.  */
 491   const unsigned char *date;
 492   const unsigned char *time;
 493
 494   /* EOF token, and a token forcing paste avoidance.  */
 495   cpp_token avoid_paste;
 496   cpp_token eof;
 497
 498   /* Opaque handle to the dependencies of mkdeps.c.  */
 499   struct deps *deps;
 500
 501   /* Obstack holding all macro hash nodes.  This never shrinks.
 502      See identifiers.c */
 503   struct obstack hash_ob;
 504
 505   /* Obstack holding buffer and conditional structures.  This is a
 506      real stack.  See directives.c.  */
 507   struct obstack buffer_ob;
 508
 509   /* Pragma table - dynamic, because a library user can add to the
 510      list of recognized pragmas.  */
 511   struct pragma_entry *pragmas;
 512
 513   /* Call backs to cpplib client.  */
 514   struct cpp_callbacks cb;
 515
 516   /* Identifier hash table.  */
 517   struct ht *hash_table;
 518   cpp_lookaside *lookaside_table;
 519
 520   /* Expression parser stack.  */
 521   struct op *op_stack, *op_limit;
 522
 523   /* User visible options.  */
 524   struct cpp_options opts;
 525
 526   /* Special nodes - identifiers with predefined significance to the
 527      preprocessor.  */
 528   struct spec_nodes spec_nodes;
 529
 530   /* Whether cpplib owns the hashtable.  */
 531   bool our_hashtable;
 532
 533   /* Traditional preprocessing output buffer (a logical line).  */
 534   struct
 535   {
 536     unsigned char *base;
 537     unsigned char *limit;
 538     unsigned char *cur;
 539     source_location first_line;
 540   } out;
 541
 542   /* Used for buffer overlays by traditional.c.  */
 543   const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
 544
 545   /* A saved list of the defined macros, for dependency checking
 546      of precompiled headers.  */
 547   struct cpp_savedstate *savedstate;
 548
 549   /* Next value of __COUNTER__ macro. */
 550   unsigned int counter;
 551
 552   /* Table of comments, when state.save_comments is true.  */
 553   cpp_comment_table comments;
 554
 555   /* List of saved macros by push_macro.  */
 556   struct def_pragma_macro *pushed_macros;
 557 };
 558
 559 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 560    If the definition of `numchar' looks odd to you, please look up the
 561    definition of a pp-number in the C standard [section 6.4.8 of C99].
 562
 563    In the unlikely event that characters other than \r and \n enter
 564    the set is_vspace, the macro handle_newline() in lex.c must be
 565    updated.  */
 566 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 567
 568 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 569 #define is_numchar(x)   ISIDNUM(x)
 570 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 571 #define is_numstart(x)  ISDIGIT(x)
 572 #define is_hspace(x)    ISBLANK(x)
 573 #define is_vspace(x)    IS_VSPACE(x)
 574 #define is_nvspace(x)   IS_NVSPACE(x)
 575 #define is_space(x)     IS_SPACE_OR_NUL(x)
 576
 577 /* This table is constant if it can be initialized at compile time,
 578    which is the case if cpp was compiled with GCC >=2.7, or another
 579    compiler that supports C99.  */
 580 #if HAVE_DESIGNATED_INITIALIZERS
 581 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 582 #else
 583 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 584 #endif
 585
 586 /* Macros.  */
 587
 588 static inline int cpp_in_system_header (cpp_reader *);
 589 static inline int
 590 cpp_in_system_header (cpp_reader *pfile)
 591 {
 592   return pfile->buffer ? pfile->buffer->sysp : 0;
 593 }
 594 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, cpp_pedantic)
 595 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, cpp_warn_traditional)
 596
 597 static inline int cpp_in_primary_file (cpp_reader *);
 598 static inline int
 599 cpp_in_primary_file (cpp_reader *pfile)
 600 {
 601   return pfile->line_table->depth == 1;
 602 }
 603
 604 /* In macro.c */
 605 extern void _cpp_free_definition (cpp_hashnode *);
 606 extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
 607 extern void _cpp_pop_context (cpp_reader *);
 608 extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
 609                                     const unsigned char *, size_t);
 610 extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
 611 extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
 612                                unsigned int);
 613 extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
 614                                                      cpp_hashnode *);
 615 extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
 616 extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
 617                                      const cpp_token *, unsigned int);
 618 extern void _cpp_backup_tokens_direct (cpp_reader *, unsigned int);
 619
 620 /* In identifiers.c */
 621 extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
 622 extern void _cpp_destroy_hashtable (cpp_reader *);
 623
 624 /* In files.c */
 625 typedef struct _cpp_file _cpp_file;
 626 extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
 627                                   bool, int);
 628 extern bool _cpp_find_failed (_cpp_file *);
 629 extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
 630 extern void _cpp_fake_include (cpp_reader *, const char *);
 631 extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
 632 extern bool _cpp_stack_include (cpp_reader *, const char *, const char *, int,
 633                                 enum include_type);
 634 extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
 635 extern void _cpp_report_missing_guards (cpp_reader *);
 636 extern void _cpp_init_files (cpp_reader *);
 637 extern void _cpp_cleanup_files (cpp_reader *);
 638 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
 639 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 640 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
 641 extern struct stat *_cpp_get_file_stat (_cpp_file *);
 642
 643 /* In expr.c */
 644 extern bool _cpp_parse_expr (cpp_reader *, bool);
 645 extern struct op *_cpp_expand_op_stack (cpp_reader *);
 646
 647 /* In lex.c */
 648 extern void _cpp_process_line_notes (cpp_reader *, int);
 649 extern void _cpp_clean_line (cpp_reader *);
 650 extern bool _cpp_get_fresh_line (cpp_reader *);
 651 extern bool _cpp_skip_block_comment (cpp_reader *);
 652 extern cpp_token *_cpp_temp_token (cpp_reader *);
 653 extern const cpp_token *_cpp_lex_token (cpp_reader *);
 654 extern cpp_token *_cpp_lex_direct (cpp_reader *);
 655 extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
 656 extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
 657 extern cpp_hashnode *_cpp_lex_identifier (cpp_reader *, const char *);
 658
 659 /* In init.c.  */
 660 extern void _cpp_maybe_push_include_file (cpp_reader *);
 661 extern const char *cpp_named_operator2name (enum cpp_ttype type);
 662
 663 /* In directives.c */
 664 extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
 665 extern int _cpp_handle_directive (cpp_reader *, int);
 666 extern void _cpp_define_builtin (cpp_reader *, const char *);
 667 extern char ** _cpp_save_pragma_names (cpp_reader *);
 668 extern void _cpp_restore_pragma_names (cpp_reader *, char **);
 669 extern int _cpp_do__Pragma (cpp_reader *);
 670 extern void _cpp_init_directives (cpp_reader *);
 671 extern void _cpp_init_internal_pragmas (cpp_reader *);
 672 extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
 673                                  linenum_type, unsigned int);
 674 extern void _cpp_pop_buffer (cpp_reader *);
 675
 676 /* In directives.c */
 677 struct _cpp_dir_only_callbacks
 678 {
 679   /* Called to print a block of lines. */
 680   void (*print_lines) (int, const void *, size_t);
 681   void (*maybe_print_line) (source_location);
 682 };
 683
 684 extern void _cpp_preprocess_dir_only (cpp_reader *,
 685                                       const struct _cpp_dir_only_callbacks *);
 686
 687 /* In traditional.c.  */
 688 extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
 689 extern bool _cpp_read_logical_line_trad (cpp_reader *);
 690 extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
 691                                  size_t);
 692 extern void _cpp_remove_overlay (cpp_reader *);
 693 extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
 694 extern bool _cpp_expansions_different_trad (const cpp_macro *,
 695                                             const cpp_macro *);
 696 extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
 697                                                   unsigned char *);
 698 extern size_t _cpp_replacement_text_len (const cpp_macro *);
 699
 700 /* In charset.c.  */
 701
 702 /* The normalization state at this point in the sequence.
 703    It starts initialized to all zeros, and at the end
 704    'level' is the normalization level of the sequence.  */
 705
 706 struct normalize_state
 707 {
 708   /* The previous character.  */
 709   cppchar_t previous;
 710   /* The combining class of the previous character.  */
 711   unsigned char prev_class;
 712   /* The lowest normalization level so far.  */
 713   enum cpp_normalize_level level;
 714 };
 715 #define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
 716 #define NORMALIZE_STATE_RESULT(st) ((st)->level)
 717
 718 /* We saw a character that matches ISIDNUM(), update a
 719    normalize_state appropriately.  */
 720 #define NORMALIZE_STATE_UPDATE_IDNUM(st) \
 721   ((st)->previous = 0, (st)->prev_class = 0)
 722
 723 extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
 724                                  const unsigned char *, int,
 725                                  struct normalize_state *state);
 726 extern void _cpp_destroy_iconv (cpp_reader *);
 727 extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
 728                                           unsigned char *, size_t, size_t,
 729                                           const unsigned char **, off_t *);
 730 extern const char *_cpp_default_encoding (void);
 731 extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
 732                                                  const unsigned char *id,
 733                                                  size_t len);
 734
 735 /* Utility routines and macros.  */
 736 #define DSC(str) (const unsigned char *)str, sizeof str - 1
 737
 738 /* These are inline functions instead of macros so we can get type
 739    checking.  */
 740 static inline int ustrcmp (const unsigned char *, const unsigned char *);
 741 static inline int ustrncmp (const unsigned char *, const unsigned char *,
 742                             size_t);
 743 static inline size_t ustrlen (const unsigned char *);
 744 static inline unsigned char *uxstrdup (const unsigned char *);
 745 static inline unsigned char *ustrchr (const unsigned char *, int);
 746 static inline int ufputs (const unsigned char *, FILE *);
 747
 748 /* Use a const char for the second parameter since it is usually a literal.  */
 749 static inline int ustrcspn (const unsigned char *, const char *);
 750
 751 static inline int
 752 ustrcmp (const unsigned char *s1, const unsigned char *s2)
 753 {
 754   return strcmp ((const char *)s1, (const char *)s2);
 755 }
 756
 757 static inline int
 758 ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
 759 {
 760   return strncmp ((const char *)s1, (const char *)s2, n);
 761 }
 762
 763 static inline int
 764 ustrcspn (const unsigned char *s1, const char *s2)
 765 {
 766   return strcspn ((const char *)s1, s2);
 767 }
 768
 769 static inline size_t
 770 ustrlen (const unsigned char *s1)
 771 {
 772   return strlen ((const char *)s1);
 773 }
 774
 775 static inline unsigned char *
 776 uxstrdup (const unsigned char *s1)
 777 {
 778   return (unsigned char *) xstrdup ((const char *)s1);
 779 }
 780
 781 static inline unsigned char *
 782 ustrchr (const unsigned char *s1, int c)
 783 {
 784   return (unsigned char *) strchr ((const char *)s1, c);
 785 }
 786
 787 static inline int
 788 ufputs (const unsigned char *s, FILE *f)
 789 {
 790   return fputs ((const char *)s, f);
 791 }
 792
 793 #ifdef __cplusplus
 794 }
 795 #endif
 796
 797 #endif /* ! LIBCPP_INTERNAL_H */